Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * NSA Security-Enhanced Linux (SELinux) security module |
| 3 | * |
| 4 | * This file contains the SELinux hook function implementations. |
| 5 | * |
| 6 | * Authors: Stephen Smalley, <sds@epoch.ncsc.mil> |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 7 | * Chris Vance, <cvance@nai.com> |
| 8 | * Wayne Salamon, <wsalamon@nai.com> |
| 9 | * James Morris <jmorris@redhat.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | * |
| 11 | * Copyright (C) 2001,2002 Networks Associates Technology, Inc. |
Eric Paris | 2069f45 | 2008-07-04 09:47:13 +1000 | [diff] [blame] | 12 | * Copyright (C) 2003-2008 Red Hat, Inc., James Morris <jmorris@redhat.com> |
| 13 | * Eric Paris <eparis@redhat.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc. |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 15 | * <dgoeddel@trustedcs.com> |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 16 | * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P. |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 17 | * Paul Moore <paul.moore@hp.com> |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 18 | * Copyright (C) 2007 Hitachi Software Engineering Co., Ltd. |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 19 | * Yuichi Nakamura <ynakam@hitachisoft.jp> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | * |
| 21 | * This program is free software; you can redistribute it and/or modify |
| 22 | * it under the terms of the GNU General Public License version 2, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 23 | * as published by the Free Software Foundation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | */ |
| 25 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/init.h> |
| 27 | #include <linux/kernel.h> |
Roland McGrath | 0d094ef | 2008-07-25 19:45:49 -0700 | [diff] [blame] | 28 | #include <linux/tracehook.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/errno.h> |
| 30 | #include <linux/sched.h> |
| 31 | #include <linux/security.h> |
| 32 | #include <linux/xattr.h> |
| 33 | #include <linux/capability.h> |
| 34 | #include <linux/unistd.h> |
| 35 | #include <linux/mm.h> |
| 36 | #include <linux/mman.h> |
| 37 | #include <linux/slab.h> |
| 38 | #include <linux/pagemap.h> |
| 39 | #include <linux/swap.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include <linux/spinlock.h> |
| 41 | #include <linux/syscalls.h> |
| 42 | #include <linux/file.h> |
Al Viro | 9f3acc3 | 2008-04-24 07:44:08 -0400 | [diff] [blame] | 43 | #include <linux/fdtable.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <linux/namei.h> |
| 45 | #include <linux/mount.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | #include <linux/proc_fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #include <linux/netfilter_ipv4.h> |
| 48 | #include <linux/netfilter_ipv6.h> |
| 49 | #include <linux/tty.h> |
| 50 | #include <net/icmp.h> |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 51 | #include <net/ip.h> /* for local_port_range[] */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | #include <net/tcp.h> /* struct or_callable used in sock_rcv_skb */ |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 53 | #include <net/net_namespace.h> |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 54 | #include <net/netlabel.h> |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 55 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | #include <asm/ioctls.h> |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 57 | #include <asm/atomic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | #include <linux/bitops.h> |
| 59 | #include <linux/interrupt.h> |
| 60 | #include <linux/netdevice.h> /* for network interface checks */ |
| 61 | #include <linux/netlink.h> |
| 62 | #include <linux/tcp.h> |
| 63 | #include <linux/udp.h> |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 64 | #include <linux/dccp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | #include <linux/quota.h> |
| 66 | #include <linux/un.h> /* for Unix socket types */ |
| 67 | #include <net/af_unix.h> /* for Unix socket types */ |
| 68 | #include <linux/parser.h> |
| 69 | #include <linux/nfs_mount.h> |
| 70 | #include <net/ipv6.h> |
| 71 | #include <linux/hugetlb.h> |
| 72 | #include <linux/personality.h> |
| 73 | #include <linux/sysctl.h> |
| 74 | #include <linux/audit.h> |
Eric Paris | 6931dfc | 2005-06-30 02:58:51 -0700 | [diff] [blame] | 75 | #include <linux/string.h> |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 76 | #include <linux/selinux.h> |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 77 | #include <linux/mutex.h> |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 78 | #include <linux/posix-timers.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
| 80 | #include "avc.h" |
| 81 | #include "objsec.h" |
| 82 | #include "netif.h" |
Paul Moore | 224dfbd | 2008-01-29 08:38:13 -0500 | [diff] [blame] | 83 | #include "netnode.h" |
Paul Moore | 3e11217 | 2008-04-10 10:48:14 -0400 | [diff] [blame] | 84 | #include "netport.h" |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 85 | #include "xfrm.h" |
Paul Moore | c60475b | 2007-02-28 15:14:23 -0500 | [diff] [blame] | 86 | #include "netlabel.h" |
Ahmed S. Darwish | 9d57a7f | 2008-03-01 22:03:14 +0200 | [diff] [blame] | 87 | #include "audit.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
| 89 | #define XATTR_SELINUX_SUFFIX "selinux" |
| 90 | #define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX |
| 91 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 92 | #define NUM_SEL_MNT_OPTS 4 |
| 93 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | extern unsigned int policydb_loaded_version; |
| 95 | extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm); |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 96 | extern int selinux_compat_net; |
James Morris | 20510f2 | 2007-10-16 23:31:32 -0700 | [diff] [blame] | 97 | extern struct security_operations *security_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 99 | /* SECMARK reference count */ |
| 100 | atomic_t selinux_secmark_refcount = ATOMIC_INIT(0); |
| 101 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 103 | int selinux_enforcing; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | |
| 105 | static int __init enforcing_setup(char *str) |
| 106 | { |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 107 | unsigned long enforcing; |
| 108 | if (!strict_strtoul(str, 0, &enforcing)) |
| 109 | selinux_enforcing = enforcing ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | return 1; |
| 111 | } |
| 112 | __setup("enforcing=", enforcing_setup); |
| 113 | #endif |
| 114 | |
| 115 | #ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM |
| 116 | int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE; |
| 117 | |
| 118 | static int __init selinux_enabled_setup(char *str) |
| 119 | { |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 120 | unsigned long enabled; |
| 121 | if (!strict_strtoul(str, 0, &enabled)) |
| 122 | selinux_enabled = enabled ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | return 1; |
| 124 | } |
| 125 | __setup("selinux=", selinux_enabled_setup); |
Stephen Smalley | 30d5528 | 2006-05-03 10:52:36 -0400 | [diff] [blame] | 126 | #else |
| 127 | int selinux_enabled = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | #endif |
| 129 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
James Morris | 6f0f0fd | 2008-07-10 17:02:07 +0900 | [diff] [blame] | 131 | /* |
| 132 | * Minimal support for a secondary security module, |
| 133 | * just to allow the use of the capability module. |
| 134 | */ |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 135 | static struct security_operations *secondary_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | |
| 137 | /* Lists of inode and superblock security structures initialized |
| 138 | before the policy was loaded. */ |
| 139 | static LIST_HEAD(superblock_security_head); |
| 140 | static DEFINE_SPINLOCK(sb_security_lock); |
| 141 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 142 | static struct kmem_cache *sel_inode_cache; |
James Morris | 7cae7e2 | 2006-03-22 00:09:22 -0800 | [diff] [blame] | 143 | |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 144 | /** |
| 145 | * selinux_secmark_enabled - Check to see if SECMARK is currently enabled |
| 146 | * |
| 147 | * Description: |
| 148 | * This function checks the SECMARK reference counter to see if any SECMARK |
| 149 | * targets are currently configured, if the reference counter is greater than |
| 150 | * zero SECMARK is considered to be enabled. Returns true (1) if SECMARK is |
| 151 | * enabled, false (0) if SECMARK is disabled. |
| 152 | * |
| 153 | */ |
| 154 | static int selinux_secmark_enabled(void) |
| 155 | { |
| 156 | return (atomic_read(&selinux_secmark_refcount) > 0); |
| 157 | } |
| 158 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 159 | /* |
| 160 | * initialise the security for the init task |
| 161 | */ |
| 162 | static void cred_init_security(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 164 | struct cred *cred = (struct cred *) current->cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | struct task_security_struct *tsec; |
| 166 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 167 | tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | if (!tsec) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 169 | panic("SELinux: Failed to initialize initial task.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 171 | tsec->osid = tsec->sid = SECINITSID_KERNEL; |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 172 | cred->security = tsec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | } |
| 174 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 175 | /* |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 176 | * get the security ID of a set of credentials |
| 177 | */ |
| 178 | static inline u32 cred_sid(const struct cred *cred) |
| 179 | { |
| 180 | const struct task_security_struct *tsec; |
| 181 | |
| 182 | tsec = cred->security; |
| 183 | return tsec->sid; |
| 184 | } |
| 185 | |
| 186 | /* |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 187 | * get the security ID of a task |
| 188 | */ |
| 189 | static inline u32 task_sid(const struct task_struct *task) |
| 190 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 191 | u32 sid; |
| 192 | |
| 193 | rcu_read_lock(); |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 194 | sid = cred_sid(__task_cred(task)); |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 195 | rcu_read_unlock(); |
| 196 | return sid; |
| 197 | } |
| 198 | |
| 199 | /* |
| 200 | * get the security ID of the current task |
| 201 | */ |
| 202 | static inline u32 current_sid(void) |
| 203 | { |
| 204 | const struct task_security_struct *tsec = current_cred()->security; |
| 205 | |
| 206 | return tsec->sid; |
| 207 | } |
| 208 | |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 209 | /* Allocate and free functions for each kind of security blob. */ |
| 210 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | static int inode_alloc_security(struct inode *inode) |
| 212 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | struct inode_security_struct *isec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 214 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | |
Josef Bacik | a02fe13 | 2008-04-04 09:35:05 +1100 | [diff] [blame] | 216 | isec = kmem_cache_zalloc(sel_inode_cache, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | if (!isec) |
| 218 | return -ENOMEM; |
| 219 | |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 220 | mutex_init(&isec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | INIT_LIST_HEAD(&isec->list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | isec->inode = inode; |
| 223 | isec->sid = SECINITSID_UNLABELED; |
| 224 | isec->sclass = SECCLASS_FILE; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 225 | isec->task_sid = sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | inode->i_security = isec; |
| 227 | |
| 228 | return 0; |
| 229 | } |
| 230 | |
| 231 | static void inode_free_security(struct inode *inode) |
| 232 | { |
| 233 | struct inode_security_struct *isec = inode->i_security; |
| 234 | struct superblock_security_struct *sbsec = inode->i_sb->s_security; |
| 235 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | spin_lock(&sbsec->isec_lock); |
| 237 | if (!list_empty(&isec->list)) |
| 238 | list_del_init(&isec->list); |
| 239 | spin_unlock(&sbsec->isec_lock); |
| 240 | |
| 241 | inode->i_security = NULL; |
James Morris | 7cae7e2 | 2006-03-22 00:09:22 -0800 | [diff] [blame] | 242 | kmem_cache_free(sel_inode_cache, isec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | } |
| 244 | |
| 245 | static int file_alloc_security(struct file *file) |
| 246 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | struct file_security_struct *fsec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 248 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | |
Stephen Smalley | 26d2a4b | 2006-02-01 03:05:55 -0800 | [diff] [blame] | 250 | fsec = kzalloc(sizeof(struct file_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | if (!fsec) |
| 252 | return -ENOMEM; |
| 253 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 254 | fsec->sid = sid; |
| 255 | fsec->fown_sid = sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | file->f_security = fsec; |
| 257 | |
| 258 | return 0; |
| 259 | } |
| 260 | |
| 261 | static void file_free_security(struct file *file) |
| 262 | { |
| 263 | struct file_security_struct *fsec = file->f_security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | file->f_security = NULL; |
| 265 | kfree(fsec); |
| 266 | } |
| 267 | |
| 268 | static int superblock_alloc_security(struct super_block *sb) |
| 269 | { |
| 270 | struct superblock_security_struct *sbsec; |
| 271 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 272 | sbsec = kzalloc(sizeof(struct superblock_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | if (!sbsec) |
| 274 | return -ENOMEM; |
| 275 | |
Eric Paris | bc7e982 | 2006-09-25 23:32:02 -0700 | [diff] [blame] | 276 | mutex_init(&sbsec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | INIT_LIST_HEAD(&sbsec->list); |
| 278 | INIT_LIST_HEAD(&sbsec->isec_head); |
| 279 | spin_lock_init(&sbsec->isec_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | sbsec->sb = sb; |
| 281 | sbsec->sid = SECINITSID_UNLABELED; |
| 282 | sbsec->def_sid = SECINITSID_FILE; |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 283 | sbsec->mntpoint_sid = SECINITSID_UNLABELED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | sb->s_security = sbsec; |
| 285 | |
| 286 | return 0; |
| 287 | } |
| 288 | |
| 289 | static void superblock_free_security(struct super_block *sb) |
| 290 | { |
| 291 | struct superblock_security_struct *sbsec = sb->s_security; |
| 292 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | spin_lock(&sb_security_lock); |
| 294 | if (!list_empty(&sbsec->list)) |
| 295 | list_del_init(&sbsec->list); |
| 296 | spin_unlock(&sb_security_lock); |
| 297 | |
| 298 | sb->s_security = NULL; |
| 299 | kfree(sbsec); |
| 300 | } |
| 301 | |
Al Viro | 7d877f3 | 2005-10-21 03:20:43 -0400 | [diff] [blame] | 302 | static int sk_alloc_security(struct sock *sk, int family, gfp_t priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | { |
| 304 | struct sk_security_struct *ssec; |
| 305 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 306 | ssec = kzalloc(sizeof(*ssec), priority); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | if (!ssec) |
| 308 | return -ENOMEM; |
| 309 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | ssec->peer_sid = SECINITSID_UNLABELED; |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 311 | ssec->sid = SECINITSID_UNLABELED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | sk->sk_security = ssec; |
| 313 | |
Paul Moore | f74af6e | 2008-02-25 11:40:33 -0500 | [diff] [blame] | 314 | selinux_netlbl_sk_security_reset(ssec, family); |
Paul Moore | 99f59ed | 2006-08-29 17:53:48 -0700 | [diff] [blame] | 315 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | return 0; |
| 317 | } |
| 318 | |
| 319 | static void sk_free_security(struct sock *sk) |
| 320 | { |
| 321 | struct sk_security_struct *ssec = sk->sk_security; |
| 322 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | sk->sk_security = NULL; |
Paul Moore | 6c5b3fc | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 324 | selinux_netlbl_sk_security_free(ssec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | kfree(ssec); |
| 326 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | |
| 328 | /* The security server must be initialized before |
| 329 | any labeling or access decisions can be provided. */ |
| 330 | extern int ss_initialized; |
| 331 | |
| 332 | /* The file system's label must be initialized prior to use. */ |
| 333 | |
| 334 | static char *labeling_behaviors[6] = { |
| 335 | "uses xattr", |
| 336 | "uses transition SIDs", |
| 337 | "uses task SIDs", |
| 338 | "uses genfs_contexts", |
| 339 | "not configured for labeling", |
| 340 | "uses mountpoint labeling", |
| 341 | }; |
| 342 | |
| 343 | static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry); |
| 344 | |
| 345 | static inline int inode_doinit(struct inode *inode) |
| 346 | { |
| 347 | return inode_doinit_with_dentry(inode, NULL); |
| 348 | } |
| 349 | |
| 350 | enum { |
Eric Paris | 31e8793 | 2007-09-19 17:19:12 -0400 | [diff] [blame] | 351 | Opt_error = -1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | Opt_context = 1, |
| 353 | Opt_fscontext = 2, |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 354 | Opt_defcontext = 3, |
| 355 | Opt_rootcontext = 4, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | }; |
| 357 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 358 | static const match_table_t tokens = { |
Eric Paris | 832cbd9 | 2008-04-01 13:24:09 -0400 | [diff] [blame] | 359 | {Opt_context, CONTEXT_STR "%s"}, |
| 360 | {Opt_fscontext, FSCONTEXT_STR "%s"}, |
| 361 | {Opt_defcontext, DEFCONTEXT_STR "%s"}, |
| 362 | {Opt_rootcontext, ROOTCONTEXT_STR "%s"}, |
Eric Paris | 31e8793 | 2007-09-19 17:19:12 -0400 | [diff] [blame] | 363 | {Opt_error, NULL}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | }; |
| 365 | |
| 366 | #define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n" |
| 367 | |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 368 | static int may_context_mount_sb_relabel(u32 sid, |
| 369 | struct superblock_security_struct *sbsec, |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 370 | const struct cred *cred) |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 371 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 372 | const struct task_security_struct *tsec = cred->security; |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 373 | int rc; |
| 374 | |
| 375 | rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, |
| 376 | FILESYSTEM__RELABELFROM, NULL); |
| 377 | if (rc) |
| 378 | return rc; |
| 379 | |
| 380 | rc = avc_has_perm(tsec->sid, sid, SECCLASS_FILESYSTEM, |
| 381 | FILESYSTEM__RELABELTO, NULL); |
| 382 | return rc; |
| 383 | } |
| 384 | |
Eric Paris | 0808925 | 2006-07-10 04:43:55 -0700 | [diff] [blame] | 385 | static int may_context_mount_inode_relabel(u32 sid, |
| 386 | struct superblock_security_struct *sbsec, |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 387 | const struct cred *cred) |
Eric Paris | 0808925 | 2006-07-10 04:43:55 -0700 | [diff] [blame] | 388 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 389 | const struct task_security_struct *tsec = cred->security; |
Eric Paris | 0808925 | 2006-07-10 04:43:55 -0700 | [diff] [blame] | 390 | int rc; |
| 391 | rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, |
| 392 | FILESYSTEM__RELABELFROM, NULL); |
| 393 | if (rc) |
| 394 | return rc; |
| 395 | |
| 396 | rc = avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, |
| 397 | FILESYSTEM__ASSOCIATE, NULL); |
| 398 | return rc; |
| 399 | } |
| 400 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 401 | static int sb_finish_set_opts(struct super_block *sb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | { |
| 403 | struct superblock_security_struct *sbsec = sb->s_security; |
| 404 | struct dentry *root = sb->s_root; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 405 | struct inode *root_inode = root->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | int rc = 0; |
| 407 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | if (sbsec->behavior == SECURITY_FS_USE_XATTR) { |
| 409 | /* Make sure that the xattr handler exists and that no |
| 410 | error other than -ENODATA is returned by getxattr on |
| 411 | the root directory. -ENODATA is ok, as this may be |
| 412 | the first boot of the SELinux kernel before we have |
| 413 | assigned xattr values to the filesystem. */ |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 414 | if (!root_inode->i_op->getxattr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | printk(KERN_WARNING "SELinux: (dev %s, type %s) has no " |
| 416 | "xattr support\n", sb->s_id, sb->s_type->name); |
| 417 | rc = -EOPNOTSUPP; |
| 418 | goto out; |
| 419 | } |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 420 | rc = root_inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | if (rc < 0 && rc != -ENODATA) { |
| 422 | if (rc == -EOPNOTSUPP) |
| 423 | printk(KERN_WARNING "SELinux: (dev %s, type " |
| 424 | "%s) has no security xattr handler\n", |
| 425 | sb->s_id, sb->s_type->name); |
| 426 | else |
| 427 | printk(KERN_WARNING "SELinux: (dev %s, type " |
| 428 | "%s) getxattr errno %d\n", sb->s_id, |
| 429 | sb->s_type->name, -rc); |
| 430 | goto out; |
| 431 | } |
| 432 | } |
| 433 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | sbsec->initialized = 1; |
| 435 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 436 | if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors)) |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 437 | printk(KERN_ERR "SELinux: initialized (dev %s, type %s), unknown behavior\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | sb->s_id, sb->s_type->name); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 439 | else |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 440 | printk(KERN_DEBUG "SELinux: initialized (dev %s, type %s), %s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | sb->s_id, sb->s_type->name, |
| 442 | labeling_behaviors[sbsec->behavior-1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | |
| 444 | /* Initialize the root inode. */ |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 445 | rc = inode_doinit_with_dentry(root_inode, root); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | |
| 447 | /* Initialize any other inodes associated with the superblock, e.g. |
| 448 | inodes created prior to initial policy load or inodes created |
| 449 | during get_sb by a pseudo filesystem that directly |
| 450 | populates itself. */ |
| 451 | spin_lock(&sbsec->isec_lock); |
| 452 | next_inode: |
| 453 | if (!list_empty(&sbsec->isec_head)) { |
| 454 | struct inode_security_struct *isec = |
| 455 | list_entry(sbsec->isec_head.next, |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 456 | struct inode_security_struct, list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | struct inode *inode = isec->inode; |
| 458 | spin_unlock(&sbsec->isec_lock); |
| 459 | inode = igrab(inode); |
| 460 | if (inode) { |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 461 | if (!IS_PRIVATE(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | inode_doinit(inode); |
| 463 | iput(inode); |
| 464 | } |
| 465 | spin_lock(&sbsec->isec_lock); |
| 466 | list_del_init(&isec->list); |
| 467 | goto next_inode; |
| 468 | } |
| 469 | spin_unlock(&sbsec->isec_lock); |
| 470 | out: |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 471 | return rc; |
| 472 | } |
| 473 | |
| 474 | /* |
| 475 | * This function should allow an FS to ask what it's mount security |
| 476 | * options were so it can use those later for submounts, displaying |
| 477 | * mount options, or whatever. |
| 478 | */ |
| 479 | static int selinux_get_mnt_opts(const struct super_block *sb, |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 480 | struct security_mnt_opts *opts) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 481 | { |
| 482 | int rc = 0, i; |
| 483 | struct superblock_security_struct *sbsec = sb->s_security; |
| 484 | char *context = NULL; |
| 485 | u32 len; |
| 486 | char tmp; |
| 487 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 488 | security_init_mnt_opts(opts); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 489 | |
| 490 | if (!sbsec->initialized) |
| 491 | return -EINVAL; |
| 492 | |
| 493 | if (!ss_initialized) |
| 494 | return -EINVAL; |
| 495 | |
| 496 | /* |
| 497 | * if we ever use sbsec flags for anything other than tracking mount |
| 498 | * settings this is going to need a mask |
| 499 | */ |
| 500 | tmp = sbsec->flags; |
| 501 | /* count the number of mount options for this sb */ |
| 502 | for (i = 0; i < 8; i++) { |
| 503 | if (tmp & 0x01) |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 504 | opts->num_mnt_opts++; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 505 | tmp >>= 1; |
| 506 | } |
| 507 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 508 | opts->mnt_opts = kcalloc(opts->num_mnt_opts, sizeof(char *), GFP_ATOMIC); |
| 509 | if (!opts->mnt_opts) { |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 510 | rc = -ENOMEM; |
| 511 | goto out_free; |
| 512 | } |
| 513 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 514 | opts->mnt_opts_flags = kcalloc(opts->num_mnt_opts, sizeof(int), GFP_ATOMIC); |
| 515 | if (!opts->mnt_opts_flags) { |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 516 | rc = -ENOMEM; |
| 517 | goto out_free; |
| 518 | } |
| 519 | |
| 520 | i = 0; |
| 521 | if (sbsec->flags & FSCONTEXT_MNT) { |
| 522 | rc = security_sid_to_context(sbsec->sid, &context, &len); |
| 523 | if (rc) |
| 524 | goto out_free; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 525 | opts->mnt_opts[i] = context; |
| 526 | opts->mnt_opts_flags[i++] = FSCONTEXT_MNT; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 527 | } |
| 528 | if (sbsec->flags & CONTEXT_MNT) { |
| 529 | rc = security_sid_to_context(sbsec->mntpoint_sid, &context, &len); |
| 530 | if (rc) |
| 531 | goto out_free; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 532 | opts->mnt_opts[i] = context; |
| 533 | opts->mnt_opts_flags[i++] = CONTEXT_MNT; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 534 | } |
| 535 | if (sbsec->flags & DEFCONTEXT_MNT) { |
| 536 | rc = security_sid_to_context(sbsec->def_sid, &context, &len); |
| 537 | if (rc) |
| 538 | goto out_free; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 539 | opts->mnt_opts[i] = context; |
| 540 | opts->mnt_opts_flags[i++] = DEFCONTEXT_MNT; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 541 | } |
| 542 | if (sbsec->flags & ROOTCONTEXT_MNT) { |
| 543 | struct inode *root = sbsec->sb->s_root->d_inode; |
| 544 | struct inode_security_struct *isec = root->i_security; |
| 545 | |
| 546 | rc = security_sid_to_context(isec->sid, &context, &len); |
| 547 | if (rc) |
| 548 | goto out_free; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 549 | opts->mnt_opts[i] = context; |
| 550 | opts->mnt_opts_flags[i++] = ROOTCONTEXT_MNT; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 551 | } |
| 552 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 553 | BUG_ON(i != opts->num_mnt_opts); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 554 | |
| 555 | return 0; |
| 556 | |
| 557 | out_free: |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 558 | security_free_mnt_opts(opts); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 559 | return rc; |
| 560 | } |
| 561 | |
| 562 | static int bad_option(struct superblock_security_struct *sbsec, char flag, |
| 563 | u32 old_sid, u32 new_sid) |
| 564 | { |
| 565 | /* check if the old mount command had the same options */ |
| 566 | if (sbsec->initialized) |
| 567 | if (!(sbsec->flags & flag) || |
| 568 | (old_sid != new_sid)) |
| 569 | return 1; |
| 570 | |
| 571 | /* check if we were passed the same options twice, |
| 572 | * aka someone passed context=a,context=b |
| 573 | */ |
| 574 | if (!sbsec->initialized) |
| 575 | if (sbsec->flags & flag) |
| 576 | return 1; |
| 577 | return 0; |
| 578 | } |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 579 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 580 | /* |
| 581 | * Allow filesystems with binary mount data to explicitly set mount point |
| 582 | * labeling information. |
| 583 | */ |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 584 | static int selinux_set_mnt_opts(struct super_block *sb, |
| 585 | struct security_mnt_opts *opts) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 586 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 587 | const struct cred *cred = current_cred(); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 588 | int rc = 0, i; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 589 | struct superblock_security_struct *sbsec = sb->s_security; |
| 590 | const char *name = sb->s_type->name; |
James Morris | 089be43 | 2008-07-15 18:32:49 +1000 | [diff] [blame] | 591 | struct inode *inode = sbsec->sb->s_root->d_inode; |
| 592 | struct inode_security_struct *root_isec = inode->i_security; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 593 | u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0; |
| 594 | u32 defcontext_sid = 0; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 595 | char **mount_options = opts->mnt_opts; |
| 596 | int *flags = opts->mnt_opts_flags; |
| 597 | int num_opts = opts->num_mnt_opts; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 598 | |
| 599 | mutex_lock(&sbsec->lock); |
| 600 | |
| 601 | if (!ss_initialized) { |
| 602 | if (!num_opts) { |
| 603 | /* Defer initialization until selinux_complete_init, |
| 604 | after the initial policy is loaded and the security |
| 605 | server is ready to handle calls. */ |
| 606 | spin_lock(&sb_security_lock); |
| 607 | if (list_empty(&sbsec->list)) |
| 608 | list_add(&sbsec->list, &superblock_security_head); |
| 609 | spin_unlock(&sb_security_lock); |
| 610 | goto out; |
| 611 | } |
| 612 | rc = -EINVAL; |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 613 | printk(KERN_WARNING "SELinux: Unable to set superblock options " |
| 614 | "before the security server is initialized\n"); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 615 | goto out; |
| 616 | } |
| 617 | |
| 618 | /* |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 619 | * Binary mount data FS will come through this function twice. Once |
| 620 | * from an explicit call and once from the generic calls from the vfs. |
| 621 | * Since the generic VFS calls will not contain any security mount data |
| 622 | * we need to skip the double mount verification. |
| 623 | * |
| 624 | * This does open a hole in which we will not notice if the first |
| 625 | * mount using this sb set explict options and a second mount using |
| 626 | * this sb does not set any security options. (The first options |
| 627 | * will be used for both mounts) |
| 628 | */ |
| 629 | if (sbsec->initialized && (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) |
| 630 | && (num_opts == 0)) |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 631 | goto out; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 632 | |
| 633 | /* |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 634 | * parse the mount options, check if they are valid sids. |
| 635 | * also check if someone is trying to mount the same sb more |
| 636 | * than once with different security options. |
| 637 | */ |
| 638 | for (i = 0; i < num_opts; i++) { |
| 639 | u32 sid; |
| 640 | rc = security_context_to_sid(mount_options[i], |
| 641 | strlen(mount_options[i]), &sid); |
| 642 | if (rc) { |
| 643 | printk(KERN_WARNING "SELinux: security_context_to_sid" |
| 644 | "(%s) failed for (dev %s, type %s) errno=%d\n", |
| 645 | mount_options[i], sb->s_id, name, rc); |
| 646 | goto out; |
| 647 | } |
| 648 | switch (flags[i]) { |
| 649 | case FSCONTEXT_MNT: |
| 650 | fscontext_sid = sid; |
| 651 | |
| 652 | if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, |
| 653 | fscontext_sid)) |
| 654 | goto out_double_mount; |
| 655 | |
| 656 | sbsec->flags |= FSCONTEXT_MNT; |
| 657 | break; |
| 658 | case CONTEXT_MNT: |
| 659 | context_sid = sid; |
| 660 | |
| 661 | if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, |
| 662 | context_sid)) |
| 663 | goto out_double_mount; |
| 664 | |
| 665 | sbsec->flags |= CONTEXT_MNT; |
| 666 | break; |
| 667 | case ROOTCONTEXT_MNT: |
| 668 | rootcontext_sid = sid; |
| 669 | |
| 670 | if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, |
| 671 | rootcontext_sid)) |
| 672 | goto out_double_mount; |
| 673 | |
| 674 | sbsec->flags |= ROOTCONTEXT_MNT; |
| 675 | |
| 676 | break; |
| 677 | case DEFCONTEXT_MNT: |
| 678 | defcontext_sid = sid; |
| 679 | |
| 680 | if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, |
| 681 | defcontext_sid)) |
| 682 | goto out_double_mount; |
| 683 | |
| 684 | sbsec->flags |= DEFCONTEXT_MNT; |
| 685 | |
| 686 | break; |
| 687 | default: |
| 688 | rc = -EINVAL; |
| 689 | goto out; |
| 690 | } |
| 691 | } |
| 692 | |
| 693 | if (sbsec->initialized) { |
| 694 | /* previously mounted with options, but not on this attempt? */ |
| 695 | if (sbsec->flags && !num_opts) |
| 696 | goto out_double_mount; |
| 697 | rc = 0; |
| 698 | goto out; |
| 699 | } |
| 700 | |
James Morris | 089be43 | 2008-07-15 18:32:49 +1000 | [diff] [blame] | 701 | if (strcmp(sb->s_type->name, "proc") == 0) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 702 | sbsec->proc = 1; |
| 703 | |
| 704 | /* Determine the labeling behavior to use for this filesystem type. */ |
James Morris | 089be43 | 2008-07-15 18:32:49 +1000 | [diff] [blame] | 705 | rc = security_fs_use(sb->s_type->name, &sbsec->behavior, &sbsec->sid); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 706 | if (rc) { |
| 707 | printk(KERN_WARNING "%s: security_fs_use(%s) returned %d\n", |
James Morris | 089be43 | 2008-07-15 18:32:49 +1000 | [diff] [blame] | 708 | __func__, sb->s_type->name, rc); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 709 | goto out; |
| 710 | } |
| 711 | |
| 712 | /* sets the context of the superblock for the fs being mounted. */ |
| 713 | if (fscontext_sid) { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 714 | rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, cred); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 715 | if (rc) |
| 716 | goto out; |
| 717 | |
| 718 | sbsec->sid = fscontext_sid; |
| 719 | } |
| 720 | |
| 721 | /* |
| 722 | * Switch to using mount point labeling behavior. |
| 723 | * sets the label used on all file below the mountpoint, and will set |
| 724 | * the superblock context if not already set. |
| 725 | */ |
| 726 | if (context_sid) { |
| 727 | if (!fscontext_sid) { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 728 | rc = may_context_mount_sb_relabel(context_sid, sbsec, |
| 729 | cred); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 730 | if (rc) |
| 731 | goto out; |
| 732 | sbsec->sid = context_sid; |
| 733 | } else { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 734 | rc = may_context_mount_inode_relabel(context_sid, sbsec, |
| 735 | cred); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 736 | if (rc) |
| 737 | goto out; |
| 738 | } |
| 739 | if (!rootcontext_sid) |
| 740 | rootcontext_sid = context_sid; |
| 741 | |
| 742 | sbsec->mntpoint_sid = context_sid; |
| 743 | sbsec->behavior = SECURITY_FS_USE_MNTPOINT; |
| 744 | } |
| 745 | |
| 746 | if (rootcontext_sid) { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 747 | rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec, |
| 748 | cred); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 749 | if (rc) |
| 750 | goto out; |
| 751 | |
| 752 | root_isec->sid = rootcontext_sid; |
| 753 | root_isec->initialized = 1; |
| 754 | } |
| 755 | |
| 756 | if (defcontext_sid) { |
| 757 | if (sbsec->behavior != SECURITY_FS_USE_XATTR) { |
| 758 | rc = -EINVAL; |
| 759 | printk(KERN_WARNING "SELinux: defcontext option is " |
| 760 | "invalid for this filesystem type\n"); |
| 761 | goto out; |
| 762 | } |
| 763 | |
| 764 | if (defcontext_sid != sbsec->def_sid) { |
| 765 | rc = may_context_mount_inode_relabel(defcontext_sid, |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 766 | sbsec, cred); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 767 | if (rc) |
| 768 | goto out; |
| 769 | } |
| 770 | |
| 771 | sbsec->def_sid = defcontext_sid; |
| 772 | } |
| 773 | |
| 774 | rc = sb_finish_set_opts(sb); |
| 775 | out: |
Eric Paris | bc7e982 | 2006-09-25 23:32:02 -0700 | [diff] [blame] | 776 | mutex_unlock(&sbsec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | return rc; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 778 | out_double_mount: |
| 779 | rc = -EINVAL; |
| 780 | printk(KERN_WARNING "SELinux: mount invalid. Same superblock, different " |
| 781 | "security settings for (dev %s, type %s)\n", sb->s_id, name); |
| 782 | goto out; |
| 783 | } |
| 784 | |
| 785 | static void selinux_sb_clone_mnt_opts(const struct super_block *oldsb, |
| 786 | struct super_block *newsb) |
| 787 | { |
| 788 | const struct superblock_security_struct *oldsbsec = oldsb->s_security; |
| 789 | struct superblock_security_struct *newsbsec = newsb->s_security; |
| 790 | |
| 791 | int set_fscontext = (oldsbsec->flags & FSCONTEXT_MNT); |
| 792 | int set_context = (oldsbsec->flags & CONTEXT_MNT); |
| 793 | int set_rootcontext = (oldsbsec->flags & ROOTCONTEXT_MNT); |
| 794 | |
Eric Paris | 0f5e642 | 2008-04-21 16:24:11 -0400 | [diff] [blame] | 795 | /* |
| 796 | * if the parent was able to be mounted it clearly had no special lsm |
| 797 | * mount options. thus we can safely put this sb on the list and deal |
| 798 | * with it later |
| 799 | */ |
| 800 | if (!ss_initialized) { |
| 801 | spin_lock(&sb_security_lock); |
| 802 | if (list_empty(&newsbsec->list)) |
| 803 | list_add(&newsbsec->list, &superblock_security_head); |
| 804 | spin_unlock(&sb_security_lock); |
| 805 | return; |
| 806 | } |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 807 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 808 | /* how can we clone if the old one wasn't set up?? */ |
| 809 | BUG_ON(!oldsbsec->initialized); |
| 810 | |
Eric Paris | 5a55261 | 2008-04-09 14:08:35 -0400 | [diff] [blame] | 811 | /* if fs is reusing a sb, just let its options stand... */ |
| 812 | if (newsbsec->initialized) |
| 813 | return; |
| 814 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 815 | mutex_lock(&newsbsec->lock); |
| 816 | |
| 817 | newsbsec->flags = oldsbsec->flags; |
| 818 | |
| 819 | newsbsec->sid = oldsbsec->sid; |
| 820 | newsbsec->def_sid = oldsbsec->def_sid; |
| 821 | newsbsec->behavior = oldsbsec->behavior; |
| 822 | |
| 823 | if (set_context) { |
| 824 | u32 sid = oldsbsec->mntpoint_sid; |
| 825 | |
| 826 | if (!set_fscontext) |
| 827 | newsbsec->sid = sid; |
| 828 | if (!set_rootcontext) { |
| 829 | struct inode *newinode = newsb->s_root->d_inode; |
| 830 | struct inode_security_struct *newisec = newinode->i_security; |
| 831 | newisec->sid = sid; |
| 832 | } |
| 833 | newsbsec->mntpoint_sid = sid; |
| 834 | } |
| 835 | if (set_rootcontext) { |
| 836 | const struct inode *oldinode = oldsb->s_root->d_inode; |
| 837 | const struct inode_security_struct *oldisec = oldinode->i_security; |
| 838 | struct inode *newinode = newsb->s_root->d_inode; |
| 839 | struct inode_security_struct *newisec = newinode->i_security; |
| 840 | |
| 841 | newisec->sid = oldisec->sid; |
| 842 | } |
| 843 | |
| 844 | sb_finish_set_opts(newsb); |
| 845 | mutex_unlock(&newsbsec->lock); |
| 846 | } |
| 847 | |
Adrian Bunk | 2e1479d | 2008-03-17 22:29:23 +0200 | [diff] [blame] | 848 | static int selinux_parse_opts_str(char *options, |
| 849 | struct security_mnt_opts *opts) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 850 | { |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 851 | char *p; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 852 | char *context = NULL, *defcontext = NULL; |
| 853 | char *fscontext = NULL, *rootcontext = NULL; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 854 | int rc, num_mnt_opts = 0; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 855 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 856 | opts->num_mnt_opts = 0; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 857 | |
| 858 | /* Standard string-based options. */ |
| 859 | while ((p = strsep(&options, "|")) != NULL) { |
| 860 | int token; |
| 861 | substring_t args[MAX_OPT_ARGS]; |
| 862 | |
| 863 | if (!*p) |
| 864 | continue; |
| 865 | |
| 866 | token = match_token(p, tokens, args); |
| 867 | |
| 868 | switch (token) { |
| 869 | case Opt_context: |
| 870 | if (context || defcontext) { |
| 871 | rc = -EINVAL; |
| 872 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 873 | goto out_err; |
| 874 | } |
| 875 | context = match_strdup(&args[0]); |
| 876 | if (!context) { |
| 877 | rc = -ENOMEM; |
| 878 | goto out_err; |
| 879 | } |
| 880 | break; |
| 881 | |
| 882 | case Opt_fscontext: |
| 883 | if (fscontext) { |
| 884 | rc = -EINVAL; |
| 885 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 886 | goto out_err; |
| 887 | } |
| 888 | fscontext = match_strdup(&args[0]); |
| 889 | if (!fscontext) { |
| 890 | rc = -ENOMEM; |
| 891 | goto out_err; |
| 892 | } |
| 893 | break; |
| 894 | |
| 895 | case Opt_rootcontext: |
| 896 | if (rootcontext) { |
| 897 | rc = -EINVAL; |
| 898 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 899 | goto out_err; |
| 900 | } |
| 901 | rootcontext = match_strdup(&args[0]); |
| 902 | if (!rootcontext) { |
| 903 | rc = -ENOMEM; |
| 904 | goto out_err; |
| 905 | } |
| 906 | break; |
| 907 | |
| 908 | case Opt_defcontext: |
| 909 | if (context || defcontext) { |
| 910 | rc = -EINVAL; |
| 911 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 912 | goto out_err; |
| 913 | } |
| 914 | defcontext = match_strdup(&args[0]); |
| 915 | if (!defcontext) { |
| 916 | rc = -ENOMEM; |
| 917 | goto out_err; |
| 918 | } |
| 919 | break; |
| 920 | |
| 921 | default: |
| 922 | rc = -EINVAL; |
| 923 | printk(KERN_WARNING "SELinux: unknown mount option\n"); |
| 924 | goto out_err; |
| 925 | |
| 926 | } |
| 927 | } |
| 928 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 929 | rc = -ENOMEM; |
| 930 | opts->mnt_opts = kcalloc(NUM_SEL_MNT_OPTS, sizeof(char *), GFP_ATOMIC); |
| 931 | if (!opts->mnt_opts) |
| 932 | goto out_err; |
| 933 | |
| 934 | opts->mnt_opts_flags = kcalloc(NUM_SEL_MNT_OPTS, sizeof(int), GFP_ATOMIC); |
| 935 | if (!opts->mnt_opts_flags) { |
| 936 | kfree(opts->mnt_opts); |
| 937 | goto out_err; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 938 | } |
| 939 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 940 | if (fscontext) { |
| 941 | opts->mnt_opts[num_mnt_opts] = fscontext; |
| 942 | opts->mnt_opts_flags[num_mnt_opts++] = FSCONTEXT_MNT; |
| 943 | } |
| 944 | if (context) { |
| 945 | opts->mnt_opts[num_mnt_opts] = context; |
| 946 | opts->mnt_opts_flags[num_mnt_opts++] = CONTEXT_MNT; |
| 947 | } |
| 948 | if (rootcontext) { |
| 949 | opts->mnt_opts[num_mnt_opts] = rootcontext; |
| 950 | opts->mnt_opts_flags[num_mnt_opts++] = ROOTCONTEXT_MNT; |
| 951 | } |
| 952 | if (defcontext) { |
| 953 | opts->mnt_opts[num_mnt_opts] = defcontext; |
| 954 | opts->mnt_opts_flags[num_mnt_opts++] = DEFCONTEXT_MNT; |
| 955 | } |
| 956 | |
| 957 | opts->num_mnt_opts = num_mnt_opts; |
| 958 | return 0; |
| 959 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 960 | out_err: |
| 961 | kfree(context); |
| 962 | kfree(defcontext); |
| 963 | kfree(fscontext); |
| 964 | kfree(rootcontext); |
| 965 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | } |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 967 | /* |
| 968 | * string mount options parsing and call set the sbsec |
| 969 | */ |
| 970 | static int superblock_doinit(struct super_block *sb, void *data) |
| 971 | { |
| 972 | int rc = 0; |
| 973 | char *options = data; |
| 974 | struct security_mnt_opts opts; |
| 975 | |
| 976 | security_init_mnt_opts(&opts); |
| 977 | |
| 978 | if (!data) |
| 979 | goto out; |
| 980 | |
| 981 | BUG_ON(sb->s_type->fs_flags & FS_BINARY_MOUNTDATA); |
| 982 | |
| 983 | rc = selinux_parse_opts_str(options, &opts); |
| 984 | if (rc) |
| 985 | goto out_err; |
| 986 | |
| 987 | out: |
| 988 | rc = selinux_set_mnt_opts(sb, &opts); |
| 989 | |
| 990 | out_err: |
| 991 | security_free_mnt_opts(&opts); |
| 992 | return rc; |
| 993 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | |
Adrian Bunk | 3583a71 | 2008-07-22 20:21:23 +0300 | [diff] [blame] | 995 | static void selinux_write_opts(struct seq_file *m, |
| 996 | struct security_mnt_opts *opts) |
Eric Paris | 2069f45 | 2008-07-04 09:47:13 +1000 | [diff] [blame] | 997 | { |
| 998 | int i; |
| 999 | char *prefix; |
| 1000 | |
| 1001 | for (i = 0; i < opts->num_mnt_opts; i++) { |
| 1002 | char *has_comma = strchr(opts->mnt_opts[i], ','); |
| 1003 | |
| 1004 | switch (opts->mnt_opts_flags[i]) { |
| 1005 | case CONTEXT_MNT: |
| 1006 | prefix = CONTEXT_STR; |
| 1007 | break; |
| 1008 | case FSCONTEXT_MNT: |
| 1009 | prefix = FSCONTEXT_STR; |
| 1010 | break; |
| 1011 | case ROOTCONTEXT_MNT: |
| 1012 | prefix = ROOTCONTEXT_STR; |
| 1013 | break; |
| 1014 | case DEFCONTEXT_MNT: |
| 1015 | prefix = DEFCONTEXT_STR; |
| 1016 | break; |
| 1017 | default: |
| 1018 | BUG(); |
| 1019 | }; |
| 1020 | /* we need a comma before each option */ |
| 1021 | seq_putc(m, ','); |
| 1022 | seq_puts(m, prefix); |
| 1023 | if (has_comma) |
| 1024 | seq_putc(m, '\"'); |
| 1025 | seq_puts(m, opts->mnt_opts[i]); |
| 1026 | if (has_comma) |
| 1027 | seq_putc(m, '\"'); |
| 1028 | } |
| 1029 | } |
| 1030 | |
| 1031 | static int selinux_sb_show_options(struct seq_file *m, struct super_block *sb) |
| 1032 | { |
| 1033 | struct security_mnt_opts opts; |
| 1034 | int rc; |
| 1035 | |
| 1036 | rc = selinux_get_mnt_opts(sb, &opts); |
Eric Paris | 383795c | 2008-07-29 17:07:26 -0400 | [diff] [blame] | 1037 | if (rc) { |
| 1038 | /* before policy load we may get EINVAL, don't show anything */ |
| 1039 | if (rc == -EINVAL) |
| 1040 | rc = 0; |
Eric Paris | 2069f45 | 2008-07-04 09:47:13 +1000 | [diff] [blame] | 1041 | return rc; |
Eric Paris | 383795c | 2008-07-29 17:07:26 -0400 | [diff] [blame] | 1042 | } |
Eric Paris | 2069f45 | 2008-07-04 09:47:13 +1000 | [diff] [blame] | 1043 | |
| 1044 | selinux_write_opts(m, &opts); |
| 1045 | |
| 1046 | security_free_mnt_opts(&opts); |
| 1047 | |
| 1048 | return rc; |
| 1049 | } |
| 1050 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | static inline u16 inode_mode_to_security_class(umode_t mode) |
| 1052 | { |
| 1053 | switch (mode & S_IFMT) { |
| 1054 | case S_IFSOCK: |
| 1055 | return SECCLASS_SOCK_FILE; |
| 1056 | case S_IFLNK: |
| 1057 | return SECCLASS_LNK_FILE; |
| 1058 | case S_IFREG: |
| 1059 | return SECCLASS_FILE; |
| 1060 | case S_IFBLK: |
| 1061 | return SECCLASS_BLK_FILE; |
| 1062 | case S_IFDIR: |
| 1063 | return SECCLASS_DIR; |
| 1064 | case S_IFCHR: |
| 1065 | return SECCLASS_CHR_FILE; |
| 1066 | case S_IFIFO: |
| 1067 | return SECCLASS_FIFO_FILE; |
| 1068 | |
| 1069 | } |
| 1070 | |
| 1071 | return SECCLASS_FILE; |
| 1072 | } |
| 1073 | |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 1074 | static inline int default_protocol_stream(int protocol) |
| 1075 | { |
| 1076 | return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP); |
| 1077 | } |
| 1078 | |
| 1079 | static inline int default_protocol_dgram(int protocol) |
| 1080 | { |
| 1081 | return (protocol == IPPROTO_IP || protocol == IPPROTO_UDP); |
| 1082 | } |
| 1083 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | static inline u16 socket_type_to_security_class(int family, int type, int protocol) |
| 1085 | { |
| 1086 | switch (family) { |
| 1087 | case PF_UNIX: |
| 1088 | switch (type) { |
| 1089 | case SOCK_STREAM: |
| 1090 | case SOCK_SEQPACKET: |
| 1091 | return SECCLASS_UNIX_STREAM_SOCKET; |
| 1092 | case SOCK_DGRAM: |
| 1093 | return SECCLASS_UNIX_DGRAM_SOCKET; |
| 1094 | } |
| 1095 | break; |
| 1096 | case PF_INET: |
| 1097 | case PF_INET6: |
| 1098 | switch (type) { |
| 1099 | case SOCK_STREAM: |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 1100 | if (default_protocol_stream(protocol)) |
| 1101 | return SECCLASS_TCP_SOCKET; |
| 1102 | else |
| 1103 | return SECCLASS_RAWIP_SOCKET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | case SOCK_DGRAM: |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 1105 | if (default_protocol_dgram(protocol)) |
| 1106 | return SECCLASS_UDP_SOCKET; |
| 1107 | else |
| 1108 | return SECCLASS_RAWIP_SOCKET; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 1109 | case SOCK_DCCP: |
| 1110 | return SECCLASS_DCCP_SOCKET; |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 1111 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | return SECCLASS_RAWIP_SOCKET; |
| 1113 | } |
| 1114 | break; |
| 1115 | case PF_NETLINK: |
| 1116 | switch (protocol) { |
| 1117 | case NETLINK_ROUTE: |
| 1118 | return SECCLASS_NETLINK_ROUTE_SOCKET; |
| 1119 | case NETLINK_FIREWALL: |
| 1120 | return SECCLASS_NETLINK_FIREWALL_SOCKET; |
James Morris | 216efaa | 2005-08-15 20:34:48 -0700 | [diff] [blame] | 1121 | case NETLINK_INET_DIAG: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | return SECCLASS_NETLINK_TCPDIAG_SOCKET; |
| 1123 | case NETLINK_NFLOG: |
| 1124 | return SECCLASS_NETLINK_NFLOG_SOCKET; |
| 1125 | case NETLINK_XFRM: |
| 1126 | return SECCLASS_NETLINK_XFRM_SOCKET; |
| 1127 | case NETLINK_SELINUX: |
| 1128 | return SECCLASS_NETLINK_SELINUX_SOCKET; |
| 1129 | case NETLINK_AUDIT: |
| 1130 | return SECCLASS_NETLINK_AUDIT_SOCKET; |
| 1131 | case NETLINK_IP6_FW: |
| 1132 | return SECCLASS_NETLINK_IP6FW_SOCKET; |
| 1133 | case NETLINK_DNRTMSG: |
| 1134 | return SECCLASS_NETLINK_DNRT_SOCKET; |
James Morris | 0c9b794 | 2005-04-16 15:24:13 -0700 | [diff] [blame] | 1135 | case NETLINK_KOBJECT_UEVENT: |
| 1136 | return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1137 | default: |
| 1138 | return SECCLASS_NETLINK_SOCKET; |
| 1139 | } |
| 1140 | case PF_PACKET: |
| 1141 | return SECCLASS_PACKET_SOCKET; |
| 1142 | case PF_KEY: |
| 1143 | return SECCLASS_KEY_SOCKET; |
Christopher J. PeBenito | 3e3ff15 | 2006-06-09 00:25:03 -0700 | [diff] [blame] | 1144 | case PF_APPLETALK: |
| 1145 | return SECCLASS_APPLETALK_SOCKET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | } |
| 1147 | |
| 1148 | return SECCLASS_SOCKET; |
| 1149 | } |
| 1150 | |
| 1151 | #ifdef CONFIG_PROC_FS |
| 1152 | static int selinux_proc_get_sid(struct proc_dir_entry *de, |
| 1153 | u16 tclass, |
| 1154 | u32 *sid) |
| 1155 | { |
| 1156 | int buflen, rc; |
| 1157 | char *buffer, *path, *end; |
| 1158 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1159 | buffer = (char *)__get_free_page(GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | if (!buffer) |
| 1161 | return -ENOMEM; |
| 1162 | |
| 1163 | buflen = PAGE_SIZE; |
| 1164 | end = buffer+buflen; |
| 1165 | *--end = '\0'; |
| 1166 | buflen--; |
| 1167 | path = end-1; |
| 1168 | *path = '/'; |
| 1169 | while (de && de != de->parent) { |
| 1170 | buflen -= de->namelen + 1; |
| 1171 | if (buflen < 0) |
| 1172 | break; |
| 1173 | end -= de->namelen; |
| 1174 | memcpy(end, de->name, de->namelen); |
| 1175 | *--end = '/'; |
| 1176 | path = end; |
| 1177 | de = de->parent; |
| 1178 | } |
| 1179 | rc = security_genfs_sid("proc", path, tclass, sid); |
| 1180 | free_page((unsigned long)buffer); |
| 1181 | return rc; |
| 1182 | } |
| 1183 | #else |
| 1184 | static int selinux_proc_get_sid(struct proc_dir_entry *de, |
| 1185 | u16 tclass, |
| 1186 | u32 *sid) |
| 1187 | { |
| 1188 | return -EINVAL; |
| 1189 | } |
| 1190 | #endif |
| 1191 | |
| 1192 | /* The inode's security attributes must be initialized before first use. */ |
| 1193 | static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry) |
| 1194 | { |
| 1195 | struct superblock_security_struct *sbsec = NULL; |
| 1196 | struct inode_security_struct *isec = inode->i_security; |
| 1197 | u32 sid; |
| 1198 | struct dentry *dentry; |
| 1199 | #define INITCONTEXTLEN 255 |
| 1200 | char *context = NULL; |
| 1201 | unsigned len = 0; |
| 1202 | int rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | |
| 1204 | if (isec->initialized) |
| 1205 | goto out; |
| 1206 | |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1207 | mutex_lock(&isec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1208 | if (isec->initialized) |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1209 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | |
| 1211 | sbsec = inode->i_sb->s_security; |
| 1212 | if (!sbsec->initialized) { |
| 1213 | /* Defer initialization until selinux_complete_init, |
| 1214 | after the initial policy is loaded and the security |
| 1215 | server is ready to handle calls. */ |
| 1216 | spin_lock(&sbsec->isec_lock); |
| 1217 | if (list_empty(&isec->list)) |
| 1218 | list_add(&isec->list, &sbsec->isec_head); |
| 1219 | spin_unlock(&sbsec->isec_lock); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1220 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | } |
| 1222 | |
| 1223 | switch (sbsec->behavior) { |
| 1224 | case SECURITY_FS_USE_XATTR: |
| 1225 | if (!inode->i_op->getxattr) { |
| 1226 | isec->sid = sbsec->def_sid; |
| 1227 | break; |
| 1228 | } |
| 1229 | |
| 1230 | /* Need a dentry, since the xattr API requires one. |
| 1231 | Life would be simpler if we could just pass the inode. */ |
| 1232 | if (opt_dentry) { |
| 1233 | /* Called from d_instantiate or d_splice_alias. */ |
| 1234 | dentry = dget(opt_dentry); |
| 1235 | } else { |
| 1236 | /* Called from selinux_complete_init, try to find a dentry. */ |
| 1237 | dentry = d_find_alias(inode); |
| 1238 | } |
| 1239 | if (!dentry) { |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 1240 | printk(KERN_WARNING "SELinux: %s: no dentry for dev=%s " |
Harvey Harrison | dd6f953 | 2008-03-06 10:03:59 +1100 | [diff] [blame] | 1241 | "ino=%ld\n", __func__, inode->i_sb->s_id, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | inode->i_ino); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1243 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1244 | } |
| 1245 | |
| 1246 | len = INITCONTEXTLEN; |
Stephen Smalley | 869ab51 | 2008-04-04 08:46:05 -0400 | [diff] [blame] | 1247 | context = kmalloc(len, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | if (!context) { |
| 1249 | rc = -ENOMEM; |
| 1250 | dput(dentry); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1251 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1252 | } |
| 1253 | rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, |
| 1254 | context, len); |
| 1255 | if (rc == -ERANGE) { |
| 1256 | /* Need a larger buffer. Query for the right size. */ |
| 1257 | rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, |
| 1258 | NULL, 0); |
| 1259 | if (rc < 0) { |
| 1260 | dput(dentry); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1261 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | } |
| 1263 | kfree(context); |
| 1264 | len = rc; |
Stephen Smalley | 869ab51 | 2008-04-04 08:46:05 -0400 | [diff] [blame] | 1265 | context = kmalloc(len, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1266 | if (!context) { |
| 1267 | rc = -ENOMEM; |
| 1268 | dput(dentry); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1269 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | } |
| 1271 | rc = inode->i_op->getxattr(dentry, |
| 1272 | XATTR_NAME_SELINUX, |
| 1273 | context, len); |
| 1274 | } |
| 1275 | dput(dentry); |
| 1276 | if (rc < 0) { |
| 1277 | if (rc != -ENODATA) { |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 1278 | printk(KERN_WARNING "SELinux: %s: getxattr returned " |
Harvey Harrison | dd6f953 | 2008-03-06 10:03:59 +1100 | [diff] [blame] | 1279 | "%d for dev=%s ino=%ld\n", __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1280 | -rc, inode->i_sb->s_id, inode->i_ino); |
| 1281 | kfree(context); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1282 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | } |
| 1284 | /* Map ENODATA to the default file SID */ |
| 1285 | sid = sbsec->def_sid; |
| 1286 | rc = 0; |
| 1287 | } else { |
James Morris | f5c1d5b | 2005-07-28 01:07:37 -0700 | [diff] [blame] | 1288 | rc = security_context_to_sid_default(context, rc, &sid, |
Stephen Smalley | 869ab51 | 2008-04-04 08:46:05 -0400 | [diff] [blame] | 1289 | sbsec->def_sid, |
| 1290 | GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | if (rc) { |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 1292 | printk(KERN_WARNING "SELinux: %s: context_to_sid(%s) " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1293 | "returned %d for dev=%s ino=%ld\n", |
Harvey Harrison | dd6f953 | 2008-03-06 10:03:59 +1100 | [diff] [blame] | 1294 | __func__, context, -rc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1295 | inode->i_sb->s_id, inode->i_ino); |
| 1296 | kfree(context); |
| 1297 | /* Leave with the unlabeled SID */ |
| 1298 | rc = 0; |
| 1299 | break; |
| 1300 | } |
| 1301 | } |
| 1302 | kfree(context); |
| 1303 | isec->sid = sid; |
| 1304 | break; |
| 1305 | case SECURITY_FS_USE_TASK: |
| 1306 | isec->sid = isec->task_sid; |
| 1307 | break; |
| 1308 | case SECURITY_FS_USE_TRANS: |
| 1309 | /* Default to the fs SID. */ |
| 1310 | isec->sid = sbsec->sid; |
| 1311 | |
| 1312 | /* Try to obtain a transition SID. */ |
| 1313 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
| 1314 | rc = security_transition_sid(isec->task_sid, |
| 1315 | sbsec->sid, |
| 1316 | isec->sclass, |
| 1317 | &sid); |
| 1318 | if (rc) |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1319 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1320 | isec->sid = sid; |
| 1321 | break; |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 1322 | case SECURITY_FS_USE_MNTPOINT: |
| 1323 | isec->sid = sbsec->mntpoint_sid; |
| 1324 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1325 | default: |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 1326 | /* Default to the fs superblock SID. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1327 | isec->sid = sbsec->sid; |
| 1328 | |
Stephen Smalley | ea6b184 | 2008-09-22 15:41:19 -0400 | [diff] [blame] | 1329 | if (sbsec->proc && !S_ISLNK(inode->i_mode)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | struct proc_inode *proci = PROC_I(inode); |
| 1331 | if (proci->pde) { |
| 1332 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
| 1333 | rc = selinux_proc_get_sid(proci->pde, |
| 1334 | isec->sclass, |
| 1335 | &sid); |
| 1336 | if (rc) |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1337 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1338 | isec->sid = sid; |
| 1339 | } |
| 1340 | } |
| 1341 | break; |
| 1342 | } |
| 1343 | |
| 1344 | isec->initialized = 1; |
| 1345 | |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1346 | out_unlock: |
| 1347 | mutex_unlock(&isec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1348 | out: |
| 1349 | if (isec->sclass == SECCLASS_FILE) |
| 1350 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | return rc; |
| 1352 | } |
| 1353 | |
| 1354 | /* Convert a Linux signal to an access vector. */ |
| 1355 | static inline u32 signal_to_av(int sig) |
| 1356 | { |
| 1357 | u32 perm = 0; |
| 1358 | |
| 1359 | switch (sig) { |
| 1360 | case SIGCHLD: |
| 1361 | /* Commonly granted from child to parent. */ |
| 1362 | perm = PROCESS__SIGCHLD; |
| 1363 | break; |
| 1364 | case SIGKILL: |
| 1365 | /* Cannot be caught or ignored */ |
| 1366 | perm = PROCESS__SIGKILL; |
| 1367 | break; |
| 1368 | case SIGSTOP: |
| 1369 | /* Cannot be caught or ignored */ |
| 1370 | perm = PROCESS__SIGSTOP; |
| 1371 | break; |
| 1372 | default: |
| 1373 | /* All other signals. */ |
| 1374 | perm = PROCESS__SIGNAL; |
| 1375 | break; |
| 1376 | } |
| 1377 | |
| 1378 | return perm; |
| 1379 | } |
| 1380 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1381 | /* |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 1382 | * Check permission between a pair of credentials |
| 1383 | * fork check, ptrace check, etc. |
| 1384 | */ |
| 1385 | static int cred_has_perm(const struct cred *actor, |
| 1386 | const struct cred *target, |
| 1387 | u32 perms) |
| 1388 | { |
| 1389 | u32 asid = cred_sid(actor), tsid = cred_sid(target); |
| 1390 | |
| 1391 | return avc_has_perm(asid, tsid, SECCLASS_PROCESS, perms, NULL); |
| 1392 | } |
| 1393 | |
| 1394 | /* |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1395 | * Check permission between a pair of tasks, e.g. signal checks, |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1396 | * fork check, ptrace check, etc. |
| 1397 | * tsk1 is the actor and tsk2 is the target |
| 1398 | */ |
| 1399 | static int task_has_perm(const struct task_struct *tsk1, |
| 1400 | const struct task_struct *tsk2, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | u32 perms) |
| 1402 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1403 | const struct task_security_struct *__tsec1, *__tsec2; |
| 1404 | u32 sid1, sid2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1406 | rcu_read_lock(); |
| 1407 | __tsec1 = __task_cred(tsk1)->security; sid1 = __tsec1->sid; |
| 1408 | __tsec2 = __task_cred(tsk2)->security; sid2 = __tsec2->sid; |
| 1409 | rcu_read_unlock(); |
| 1410 | return avc_has_perm(sid1, sid2, SECCLASS_PROCESS, perms, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1411 | } |
| 1412 | |
Stephen Smalley | b68e418 | 2008-02-07 11:21:04 -0500 | [diff] [blame] | 1413 | #if CAP_LAST_CAP > 63 |
| 1414 | #error Fix SELinux to handle capabilities > 63. |
| 1415 | #endif |
| 1416 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1417 | /* Check whether a task is allowed to use a capability. */ |
| 1418 | static int task_has_capability(struct task_struct *tsk, |
Eric Paris | 0611216 | 2008-11-11 22:02:50 +1100 | [diff] [blame] | 1419 | int cap, int audit) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1420 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1421 | struct avc_audit_data ad; |
Eric Paris | 0611216 | 2008-11-11 22:02:50 +1100 | [diff] [blame] | 1422 | struct av_decision avd; |
Stephen Smalley | b68e418 | 2008-02-07 11:21:04 -0500 | [diff] [blame] | 1423 | u16 sclass; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1424 | u32 sid = task_sid(tsk); |
Stephen Smalley | b68e418 | 2008-02-07 11:21:04 -0500 | [diff] [blame] | 1425 | u32 av = CAP_TO_MASK(cap); |
Eric Paris | 0611216 | 2008-11-11 22:02:50 +1100 | [diff] [blame] | 1426 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1428 | AVC_AUDIT_DATA_INIT(&ad, CAP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | ad.tsk = tsk; |
| 1430 | ad.u.cap = cap; |
| 1431 | |
Stephen Smalley | b68e418 | 2008-02-07 11:21:04 -0500 | [diff] [blame] | 1432 | switch (CAP_TO_INDEX(cap)) { |
| 1433 | case 0: |
| 1434 | sclass = SECCLASS_CAPABILITY; |
| 1435 | break; |
| 1436 | case 1: |
| 1437 | sclass = SECCLASS_CAPABILITY2; |
| 1438 | break; |
| 1439 | default: |
| 1440 | printk(KERN_ERR |
| 1441 | "SELinux: out of range capability %d\n", cap); |
| 1442 | BUG(); |
| 1443 | } |
Eric Paris | 0611216 | 2008-11-11 22:02:50 +1100 | [diff] [blame] | 1444 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1445 | rc = avc_has_perm_noaudit(sid, sid, sclass, av, 0, &avd); |
Eric Paris | 0611216 | 2008-11-11 22:02:50 +1100 | [diff] [blame] | 1446 | if (audit == SECURITY_CAP_AUDIT) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1447 | avc_audit(sid, sid, sclass, av, &avd, rc, &ad); |
Eric Paris | 0611216 | 2008-11-11 22:02:50 +1100 | [diff] [blame] | 1448 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | } |
| 1450 | |
| 1451 | /* Check whether a task is allowed to use a system operation. */ |
| 1452 | static int task_has_system(struct task_struct *tsk, |
| 1453 | u32 perms) |
| 1454 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1455 | u32 sid = task_sid(tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1456 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1457 | return avc_has_perm(sid, SECINITSID_KERNEL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | SECCLASS_SYSTEM, perms, NULL); |
| 1459 | } |
| 1460 | |
| 1461 | /* Check whether a task has a particular permission to an inode. |
| 1462 | The 'adp' parameter is optional and allows other audit |
| 1463 | data to be passed (e.g. the dentry). */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1464 | static int inode_has_perm(const struct cred *cred, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | struct inode *inode, |
| 1466 | u32 perms, |
| 1467 | struct avc_audit_data *adp) |
| 1468 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | struct inode_security_struct *isec; |
| 1470 | struct avc_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1471 | u32 sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1472 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1473 | if (unlikely(IS_PRIVATE(inode))) |
Stephen Smalley | bbaca6c | 2007-02-14 00:34:16 -0800 | [diff] [blame] | 1474 | return 0; |
| 1475 | |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1476 | sid = cred_sid(cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1477 | isec = inode->i_security; |
| 1478 | |
| 1479 | if (!adp) { |
| 1480 | adp = &ad; |
| 1481 | AVC_AUDIT_DATA_INIT(&ad, FS); |
| 1482 | ad.u.fs.inode = inode; |
| 1483 | } |
| 1484 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1485 | return avc_has_perm(sid, isec->sid, isec->sclass, perms, adp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1486 | } |
| 1487 | |
| 1488 | /* Same as inode_has_perm, but pass explicit audit data containing |
| 1489 | the dentry to help the auditing code to more easily generate the |
| 1490 | pathname if needed. */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1491 | static inline int dentry_has_perm(const struct cred *cred, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | struct vfsmount *mnt, |
| 1493 | struct dentry *dentry, |
| 1494 | u32 av) |
| 1495 | { |
| 1496 | struct inode *inode = dentry->d_inode; |
| 1497 | struct avc_audit_data ad; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1498 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1499 | AVC_AUDIT_DATA_INIT(&ad, FS); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1500 | ad.u.fs.path.mnt = mnt; |
| 1501 | ad.u.fs.path.dentry = dentry; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1502 | return inode_has_perm(cred, inode, av, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1503 | } |
| 1504 | |
| 1505 | /* Check whether a task can use an open file descriptor to |
| 1506 | access an inode in a given way. Check access to the |
| 1507 | descriptor itself, and then use dentry_has_perm to |
| 1508 | check a particular permission to the file. |
| 1509 | Access to the descriptor is implicitly granted if it |
| 1510 | has the same SID as the process. If av is zero, then |
| 1511 | access to the file is not checked, e.g. for cases |
| 1512 | where only the descriptor is affected like seek. */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1513 | static int file_has_perm(const struct cred *cred, |
| 1514 | struct file *file, |
| 1515 | u32 av) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1517 | struct file_security_struct *fsec = file->f_security; |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1518 | struct inode *inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1519 | struct avc_audit_data ad; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1520 | u32 sid = cred_sid(cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1521 | int rc; |
| 1522 | |
| 1523 | AVC_AUDIT_DATA_INIT(&ad, FS); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1524 | ad.u.fs.path = file->f_path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1525 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1526 | if (sid != fsec->sid) { |
| 1527 | rc = avc_has_perm(sid, fsec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1528 | SECCLASS_FD, |
| 1529 | FD__USE, |
| 1530 | &ad); |
| 1531 | if (rc) |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1532 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | } |
| 1534 | |
| 1535 | /* av is zero if only checking access to the descriptor. */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1536 | rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | if (av) |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1538 | rc = inode_has_perm(cred, inode, av, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1539 | |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1540 | out: |
| 1541 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | } |
| 1543 | |
| 1544 | /* Check whether a task can create a file. */ |
| 1545 | static int may_create(struct inode *dir, |
| 1546 | struct dentry *dentry, |
| 1547 | u16 tclass) |
| 1548 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1549 | const struct cred *cred = current_cred(); |
| 1550 | const struct task_security_struct *tsec = cred->security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1551 | struct inode_security_struct *dsec; |
| 1552 | struct superblock_security_struct *sbsec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1553 | u32 sid, newsid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1554 | struct avc_audit_data ad; |
| 1555 | int rc; |
| 1556 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1557 | dsec = dir->i_security; |
| 1558 | sbsec = dir->i_sb->s_security; |
| 1559 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1560 | sid = tsec->sid; |
| 1561 | newsid = tsec->create_sid; |
| 1562 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1563 | AVC_AUDIT_DATA_INIT(&ad, FS); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1564 | ad.u.fs.path.dentry = dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1565 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1566 | rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1567 | DIR__ADD_NAME | DIR__SEARCH, |
| 1568 | &ad); |
| 1569 | if (rc) |
| 1570 | return rc; |
| 1571 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1572 | if (!newsid || sbsec->behavior == SECURITY_FS_USE_MNTPOINT) { |
| 1573 | rc = security_transition_sid(sid, dsec->sid, tclass, &newsid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1574 | if (rc) |
| 1575 | return rc; |
| 1576 | } |
| 1577 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1578 | rc = avc_has_perm(sid, newsid, tclass, FILE__CREATE, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1579 | if (rc) |
| 1580 | return rc; |
| 1581 | |
| 1582 | return avc_has_perm(newsid, sbsec->sid, |
| 1583 | SECCLASS_FILESYSTEM, |
| 1584 | FILESYSTEM__ASSOCIATE, &ad); |
| 1585 | } |
| 1586 | |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 1587 | /* Check whether a task can create a key. */ |
| 1588 | static int may_create_key(u32 ksid, |
| 1589 | struct task_struct *ctx) |
| 1590 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1591 | u32 sid = task_sid(ctx); |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 1592 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1593 | return avc_has_perm(sid, ksid, SECCLASS_KEY, KEY__CREATE, NULL); |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 1594 | } |
| 1595 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1596 | #define MAY_LINK 0 |
| 1597 | #define MAY_UNLINK 1 |
| 1598 | #define MAY_RMDIR 2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1599 | |
| 1600 | /* Check whether a task can link, unlink, or rmdir a file/directory. */ |
| 1601 | static int may_link(struct inode *dir, |
| 1602 | struct dentry *dentry, |
| 1603 | int kind) |
| 1604 | |
| 1605 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | struct inode_security_struct *dsec, *isec; |
| 1607 | struct avc_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1608 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | u32 av; |
| 1610 | int rc; |
| 1611 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1612 | dsec = dir->i_security; |
| 1613 | isec = dentry->d_inode->i_security; |
| 1614 | |
| 1615 | AVC_AUDIT_DATA_INIT(&ad, FS); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1616 | ad.u.fs.path.dentry = dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1617 | |
| 1618 | av = DIR__SEARCH; |
| 1619 | av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME); |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1620 | rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR, av, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1621 | if (rc) |
| 1622 | return rc; |
| 1623 | |
| 1624 | switch (kind) { |
| 1625 | case MAY_LINK: |
| 1626 | av = FILE__LINK; |
| 1627 | break; |
| 1628 | case MAY_UNLINK: |
| 1629 | av = FILE__UNLINK; |
| 1630 | break; |
| 1631 | case MAY_RMDIR: |
| 1632 | av = DIR__RMDIR; |
| 1633 | break; |
| 1634 | default: |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 1635 | printk(KERN_WARNING "SELinux: %s: unrecognized kind %d\n", |
| 1636 | __func__, kind); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1637 | return 0; |
| 1638 | } |
| 1639 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1640 | rc = avc_has_perm(sid, isec->sid, isec->sclass, av, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | return rc; |
| 1642 | } |
| 1643 | |
| 1644 | static inline int may_rename(struct inode *old_dir, |
| 1645 | struct dentry *old_dentry, |
| 1646 | struct inode *new_dir, |
| 1647 | struct dentry *new_dentry) |
| 1648 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1649 | struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec; |
| 1650 | struct avc_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1651 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1652 | u32 av; |
| 1653 | int old_is_dir, new_is_dir; |
| 1654 | int rc; |
| 1655 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1656 | old_dsec = old_dir->i_security; |
| 1657 | old_isec = old_dentry->d_inode->i_security; |
| 1658 | old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode); |
| 1659 | new_dsec = new_dir->i_security; |
| 1660 | |
| 1661 | AVC_AUDIT_DATA_INIT(&ad, FS); |
| 1662 | |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1663 | ad.u.fs.path.dentry = old_dentry; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1664 | rc = avc_has_perm(sid, old_dsec->sid, SECCLASS_DIR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1665 | DIR__REMOVE_NAME | DIR__SEARCH, &ad); |
| 1666 | if (rc) |
| 1667 | return rc; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1668 | rc = avc_has_perm(sid, old_isec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1669 | old_isec->sclass, FILE__RENAME, &ad); |
| 1670 | if (rc) |
| 1671 | return rc; |
| 1672 | if (old_is_dir && new_dir != old_dir) { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1673 | rc = avc_has_perm(sid, old_isec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | old_isec->sclass, DIR__REPARENT, &ad); |
| 1675 | if (rc) |
| 1676 | return rc; |
| 1677 | } |
| 1678 | |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1679 | ad.u.fs.path.dentry = new_dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1680 | av = DIR__ADD_NAME | DIR__SEARCH; |
| 1681 | if (new_dentry->d_inode) |
| 1682 | av |= DIR__REMOVE_NAME; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1683 | rc = avc_has_perm(sid, new_dsec->sid, SECCLASS_DIR, av, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1684 | if (rc) |
| 1685 | return rc; |
| 1686 | if (new_dentry->d_inode) { |
| 1687 | new_isec = new_dentry->d_inode->i_security; |
| 1688 | new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode); |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1689 | rc = avc_has_perm(sid, new_isec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | new_isec->sclass, |
| 1691 | (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad); |
| 1692 | if (rc) |
| 1693 | return rc; |
| 1694 | } |
| 1695 | |
| 1696 | return 0; |
| 1697 | } |
| 1698 | |
| 1699 | /* Check whether a task can perform a filesystem operation. */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1700 | static int superblock_has_perm(const struct cred *cred, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1701 | struct super_block *sb, |
| 1702 | u32 perms, |
| 1703 | struct avc_audit_data *ad) |
| 1704 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1705 | struct superblock_security_struct *sbsec; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1706 | u32 sid = cred_sid(cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1707 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | sbsec = sb->s_security; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1709 | return avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, perms, ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1710 | } |
| 1711 | |
| 1712 | /* Convert a Linux mode and permission mask to an access vector. */ |
| 1713 | static inline u32 file_mask_to_av(int mode, int mask) |
| 1714 | { |
| 1715 | u32 av = 0; |
| 1716 | |
| 1717 | if ((mode & S_IFMT) != S_IFDIR) { |
| 1718 | if (mask & MAY_EXEC) |
| 1719 | av |= FILE__EXECUTE; |
| 1720 | if (mask & MAY_READ) |
| 1721 | av |= FILE__READ; |
| 1722 | |
| 1723 | if (mask & MAY_APPEND) |
| 1724 | av |= FILE__APPEND; |
| 1725 | else if (mask & MAY_WRITE) |
| 1726 | av |= FILE__WRITE; |
| 1727 | |
| 1728 | } else { |
| 1729 | if (mask & MAY_EXEC) |
| 1730 | av |= DIR__SEARCH; |
| 1731 | if (mask & MAY_WRITE) |
| 1732 | av |= DIR__WRITE; |
| 1733 | if (mask & MAY_READ) |
| 1734 | av |= DIR__READ; |
| 1735 | } |
| 1736 | |
| 1737 | return av; |
| 1738 | } |
| 1739 | |
| 1740 | /* Convert a Linux file to an access vector. */ |
| 1741 | static inline u32 file_to_av(struct file *file) |
| 1742 | { |
| 1743 | u32 av = 0; |
| 1744 | |
| 1745 | if (file->f_mode & FMODE_READ) |
| 1746 | av |= FILE__READ; |
| 1747 | if (file->f_mode & FMODE_WRITE) { |
| 1748 | if (file->f_flags & O_APPEND) |
| 1749 | av |= FILE__APPEND; |
| 1750 | else |
| 1751 | av |= FILE__WRITE; |
| 1752 | } |
Stephen Smalley | 0794c66 | 2008-03-17 08:55:18 -0400 | [diff] [blame] | 1753 | if (!av) { |
| 1754 | /* |
| 1755 | * Special file opened with flags 3 for ioctl-only use. |
| 1756 | */ |
| 1757 | av = FILE__IOCTL; |
| 1758 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1759 | |
| 1760 | return av; |
| 1761 | } |
| 1762 | |
Eric Paris | 8b6a5a3 | 2008-10-29 17:06:46 -0400 | [diff] [blame] | 1763 | /* |
| 1764 | * Convert a file to an access vector and include the correct open |
| 1765 | * open permission. |
| 1766 | */ |
| 1767 | static inline u32 open_file_to_av(struct file *file) |
| 1768 | { |
| 1769 | u32 av = file_to_av(file); |
| 1770 | |
| 1771 | if (selinux_policycap_openperm) { |
| 1772 | mode_t mode = file->f_path.dentry->d_inode->i_mode; |
| 1773 | /* |
| 1774 | * lnk files and socks do not really have an 'open' |
| 1775 | */ |
| 1776 | if (S_ISREG(mode)) |
| 1777 | av |= FILE__OPEN; |
| 1778 | else if (S_ISCHR(mode)) |
| 1779 | av |= CHR_FILE__OPEN; |
| 1780 | else if (S_ISBLK(mode)) |
| 1781 | av |= BLK_FILE__OPEN; |
| 1782 | else if (S_ISFIFO(mode)) |
| 1783 | av |= FIFO_FILE__OPEN; |
| 1784 | else if (S_ISDIR(mode)) |
| 1785 | av |= DIR__OPEN; |
| 1786 | else |
| 1787 | printk(KERN_ERR "SELinux: WARNING: inside %s with " |
| 1788 | "unknown mode:%o\n", __func__, mode); |
| 1789 | } |
| 1790 | return av; |
| 1791 | } |
| 1792 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1793 | /* Hook functions begin here. */ |
| 1794 | |
David Howells | 5cd9c58 | 2008-08-14 11:37:28 +0100 | [diff] [blame] | 1795 | static int selinux_ptrace_may_access(struct task_struct *child, |
| 1796 | unsigned int mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1797 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1798 | int rc; |
| 1799 | |
David Howells | 5cd9c58 | 2008-08-14 11:37:28 +0100 | [diff] [blame] | 1800 | rc = secondary_ops->ptrace_may_access(child, mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1801 | if (rc) |
| 1802 | return rc; |
| 1803 | |
Stephen Smalley | 006ebb4 | 2008-05-19 08:32:49 -0400 | [diff] [blame] | 1804 | if (mode == PTRACE_MODE_READ) { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1805 | u32 sid = current_sid(); |
| 1806 | u32 csid = task_sid(child); |
| 1807 | return avc_has_perm(sid, csid, SECCLASS_FILE, FILE__READ, NULL); |
Stephen Smalley | 006ebb4 | 2008-05-19 08:32:49 -0400 | [diff] [blame] | 1808 | } |
| 1809 | |
David Howells | 5cd9c58 | 2008-08-14 11:37:28 +0100 | [diff] [blame] | 1810 | return task_has_perm(current, child, PROCESS__PTRACE); |
| 1811 | } |
| 1812 | |
| 1813 | static int selinux_ptrace_traceme(struct task_struct *parent) |
| 1814 | { |
| 1815 | int rc; |
| 1816 | |
| 1817 | rc = secondary_ops->ptrace_traceme(parent); |
| 1818 | if (rc) |
| 1819 | return rc; |
| 1820 | |
| 1821 | return task_has_perm(parent, current, PROCESS__PTRACE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1822 | } |
| 1823 | |
| 1824 | static int selinux_capget(struct task_struct *target, kernel_cap_t *effective, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1825 | kernel_cap_t *inheritable, kernel_cap_t *permitted) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1826 | { |
| 1827 | int error; |
| 1828 | |
| 1829 | error = task_has_perm(current, target, PROCESS__GETCAP); |
| 1830 | if (error) |
| 1831 | return error; |
| 1832 | |
| 1833 | return secondary_ops->capget(target, effective, inheritable, permitted); |
| 1834 | } |
| 1835 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 1836 | static int selinux_capset(struct cred *new, const struct cred *old, |
| 1837 | const kernel_cap_t *effective, |
| 1838 | const kernel_cap_t *inheritable, |
| 1839 | const kernel_cap_t *permitted) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1840 | { |
| 1841 | int error; |
| 1842 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 1843 | error = secondary_ops->capset(new, old, |
| 1844 | effective, inheritable, permitted); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1845 | if (error) |
| 1846 | return error; |
| 1847 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 1848 | return cred_has_perm(old, new, PROCESS__SETCAP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1849 | } |
| 1850 | |
Eric Paris | 0611216 | 2008-11-11 22:02:50 +1100 | [diff] [blame] | 1851 | static int selinux_capable(struct task_struct *tsk, int cap, int audit) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1852 | { |
| 1853 | int rc; |
| 1854 | |
Eric Paris | 0611216 | 2008-11-11 22:02:50 +1100 | [diff] [blame] | 1855 | rc = secondary_ops->capable(tsk, cap, audit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1856 | if (rc) |
| 1857 | return rc; |
| 1858 | |
Eric Paris | 0611216 | 2008-11-11 22:02:50 +1100 | [diff] [blame] | 1859 | return task_has_capability(tsk, cap, audit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1860 | } |
| 1861 | |
Eric W. Biederman | 3fbfa98 | 2007-02-14 00:34:14 -0800 | [diff] [blame] | 1862 | static int selinux_sysctl_get_sid(ctl_table *table, u16 tclass, u32 *sid) |
| 1863 | { |
| 1864 | int buflen, rc; |
| 1865 | char *buffer, *path, *end; |
| 1866 | |
| 1867 | rc = -ENOMEM; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1868 | buffer = (char *)__get_free_page(GFP_KERNEL); |
Eric W. Biederman | 3fbfa98 | 2007-02-14 00:34:14 -0800 | [diff] [blame] | 1869 | if (!buffer) |
| 1870 | goto out; |
| 1871 | |
| 1872 | buflen = PAGE_SIZE; |
| 1873 | end = buffer+buflen; |
| 1874 | *--end = '\0'; |
| 1875 | buflen--; |
| 1876 | path = end-1; |
| 1877 | *path = '/'; |
| 1878 | while (table) { |
| 1879 | const char *name = table->procname; |
| 1880 | size_t namelen = strlen(name); |
| 1881 | buflen -= namelen + 1; |
| 1882 | if (buflen < 0) |
| 1883 | goto out_free; |
| 1884 | end -= namelen; |
| 1885 | memcpy(end, name, namelen); |
| 1886 | *--end = '/'; |
| 1887 | path = end; |
| 1888 | table = table->parent; |
| 1889 | } |
Eric W. Biederman | b599fdf | 2007-02-14 00:34:15 -0800 | [diff] [blame] | 1890 | buflen -= 4; |
| 1891 | if (buflen < 0) |
| 1892 | goto out_free; |
| 1893 | end -= 4; |
| 1894 | memcpy(end, "/sys", 4); |
| 1895 | path = end; |
Eric W. Biederman | 3fbfa98 | 2007-02-14 00:34:14 -0800 | [diff] [blame] | 1896 | rc = security_genfs_sid("proc", path, tclass, sid); |
| 1897 | out_free: |
| 1898 | free_page((unsigned long)buffer); |
| 1899 | out: |
| 1900 | return rc; |
| 1901 | } |
| 1902 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1903 | static int selinux_sysctl(ctl_table *table, int op) |
| 1904 | { |
| 1905 | int error = 0; |
| 1906 | u32 av; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1907 | u32 tsid, sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1908 | int rc; |
| 1909 | |
| 1910 | rc = secondary_ops->sysctl(table, op); |
| 1911 | if (rc) |
| 1912 | return rc; |
| 1913 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1914 | sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1915 | |
Eric W. Biederman | 3fbfa98 | 2007-02-14 00:34:14 -0800 | [diff] [blame] | 1916 | rc = selinux_sysctl_get_sid(table, (op == 0001) ? |
| 1917 | SECCLASS_DIR : SECCLASS_FILE, &tsid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1918 | if (rc) { |
| 1919 | /* Default to the well-defined sysctl SID. */ |
| 1920 | tsid = SECINITSID_SYSCTL; |
| 1921 | } |
| 1922 | |
| 1923 | /* The op values are "defined" in sysctl.c, thereby creating |
| 1924 | * a bad coupling between this module and sysctl.c */ |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1925 | if (op == 001) { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1926 | error = avc_has_perm(sid, tsid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1927 | SECCLASS_DIR, DIR__SEARCH, NULL); |
| 1928 | } else { |
| 1929 | av = 0; |
| 1930 | if (op & 004) |
| 1931 | av |= FILE__READ; |
| 1932 | if (op & 002) |
| 1933 | av |= FILE__WRITE; |
| 1934 | if (av) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1935 | error = avc_has_perm(sid, tsid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1936 | SECCLASS_FILE, av, NULL); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1937 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1938 | |
| 1939 | return error; |
| 1940 | } |
| 1941 | |
| 1942 | static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb) |
| 1943 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1944 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1945 | int rc = 0; |
| 1946 | |
| 1947 | if (!sb) |
| 1948 | return 0; |
| 1949 | |
| 1950 | switch (cmds) { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1951 | case Q_SYNC: |
| 1952 | case Q_QUOTAON: |
| 1953 | case Q_QUOTAOFF: |
| 1954 | case Q_SETINFO: |
| 1955 | case Q_SETQUOTA: |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1956 | rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAMOD, NULL); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1957 | break; |
| 1958 | case Q_GETFMT: |
| 1959 | case Q_GETINFO: |
| 1960 | case Q_GETQUOTA: |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1961 | rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAGET, NULL); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1962 | break; |
| 1963 | default: |
| 1964 | rc = 0; /* let the kernel handle invalid cmds */ |
| 1965 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1966 | } |
| 1967 | return rc; |
| 1968 | } |
| 1969 | |
| 1970 | static int selinux_quota_on(struct dentry *dentry) |
| 1971 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1972 | const struct cred *cred = current_cred(); |
| 1973 | |
| 1974 | return dentry_has_perm(cred, NULL, dentry, FILE__QUOTAON); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1975 | } |
| 1976 | |
| 1977 | static int selinux_syslog(int type) |
| 1978 | { |
| 1979 | int rc; |
| 1980 | |
| 1981 | rc = secondary_ops->syslog(type); |
| 1982 | if (rc) |
| 1983 | return rc; |
| 1984 | |
| 1985 | switch (type) { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1986 | case 3: /* Read last kernel messages */ |
| 1987 | case 10: /* Return size of the log buffer */ |
| 1988 | rc = task_has_system(current, SYSTEM__SYSLOG_READ); |
| 1989 | break; |
| 1990 | case 6: /* Disable logging to console */ |
| 1991 | case 7: /* Enable logging to console */ |
| 1992 | case 8: /* Set level of messages printed to console */ |
| 1993 | rc = task_has_system(current, SYSTEM__SYSLOG_CONSOLE); |
| 1994 | break; |
| 1995 | case 0: /* Close log */ |
| 1996 | case 1: /* Open log */ |
| 1997 | case 2: /* Read from log */ |
| 1998 | case 4: /* Read/clear last kernel messages */ |
| 1999 | case 5: /* Clear ring buffer */ |
| 2000 | default: |
| 2001 | rc = task_has_system(current, SYSTEM__SYSLOG_MOD); |
| 2002 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2003 | } |
| 2004 | return rc; |
| 2005 | } |
| 2006 | |
| 2007 | /* |
| 2008 | * Check that a process has enough memory to allocate a new virtual |
| 2009 | * mapping. 0 means there is enough memory for the allocation to |
| 2010 | * succeed and -ENOMEM implies there is not. |
| 2011 | * |
| 2012 | * Note that secondary_ops->capable and task_has_perm_noaudit return 0 |
| 2013 | * if the capability is granted, but __vm_enough_memory requires 1 if |
| 2014 | * the capability is granted. |
| 2015 | * |
| 2016 | * Do not audit the selinux permission check, as this is applied to all |
| 2017 | * processes that allocate mappings. |
| 2018 | */ |
Alan Cox | 34b4e4a | 2007-08-22 14:01:28 -0700 | [diff] [blame] | 2019 | static int selinux_vm_enough_memory(struct mm_struct *mm, long pages) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2020 | { |
| 2021 | int rc, cap_sys_admin = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2022 | |
Eric Paris | 0667467 | 2008-11-11 22:02:57 +1100 | [diff] [blame] | 2023 | rc = selinux_capable(current, CAP_SYS_ADMIN, SECURITY_CAP_NOAUDIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2024 | if (rc == 0) |
| 2025 | cap_sys_admin = 1; |
| 2026 | |
Alan Cox | 34b4e4a | 2007-08-22 14:01:28 -0700 | [diff] [blame] | 2027 | return __vm_enough_memory(mm, pages, cap_sys_admin); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2028 | } |
| 2029 | |
| 2030 | /* binprm security operations */ |
| 2031 | |
| 2032 | static int selinux_bprm_alloc_security(struct linux_binprm *bprm) |
| 2033 | { |
| 2034 | struct bprm_security_struct *bsec; |
| 2035 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 2036 | bsec = kzalloc(sizeof(struct bprm_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2037 | if (!bsec) |
| 2038 | return -ENOMEM; |
| 2039 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2040 | bsec->sid = SECINITSID_UNLABELED; |
| 2041 | bsec->set = 0; |
| 2042 | |
| 2043 | bprm->security = bsec; |
| 2044 | return 0; |
| 2045 | } |
| 2046 | |
| 2047 | static int selinux_bprm_set_security(struct linux_binprm *bprm) |
| 2048 | { |
| 2049 | struct task_security_struct *tsec; |
Josef Sipek | 3d5ff52 | 2006-12-08 02:37:38 -0800 | [diff] [blame] | 2050 | struct inode *inode = bprm->file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2051 | struct inode_security_struct *isec; |
| 2052 | struct bprm_security_struct *bsec; |
| 2053 | u32 newsid; |
| 2054 | struct avc_audit_data ad; |
| 2055 | int rc; |
| 2056 | |
| 2057 | rc = secondary_ops->bprm_set_security(bprm); |
| 2058 | if (rc) |
| 2059 | return rc; |
| 2060 | |
| 2061 | bsec = bprm->security; |
| 2062 | |
| 2063 | if (bsec->set) |
| 2064 | return 0; |
| 2065 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2066 | tsec = current_security(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2067 | isec = inode->i_security; |
| 2068 | |
| 2069 | /* Default to the current task SID. */ |
| 2070 | bsec->sid = tsec->sid; |
| 2071 | |
Michael LeMay | 28eba5b | 2006-06-27 02:53:42 -0700 | [diff] [blame] | 2072 | /* Reset fs, key, and sock SIDs on execve. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2073 | tsec->create_sid = 0; |
Michael LeMay | 28eba5b | 2006-06-27 02:53:42 -0700 | [diff] [blame] | 2074 | tsec->keycreate_sid = 0; |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 2075 | tsec->sockcreate_sid = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2076 | |
| 2077 | if (tsec->exec_sid) { |
| 2078 | newsid = tsec->exec_sid; |
| 2079 | /* Reset exec SID on execve. */ |
| 2080 | tsec->exec_sid = 0; |
| 2081 | } else { |
| 2082 | /* Check for a default transition on this program. */ |
| 2083 | rc = security_transition_sid(tsec->sid, isec->sid, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2084 | SECCLASS_PROCESS, &newsid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2085 | if (rc) |
| 2086 | return rc; |
| 2087 | } |
| 2088 | |
| 2089 | AVC_AUDIT_DATA_INIT(&ad, FS); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 2090 | ad.u.fs.path = bprm->file->f_path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2091 | |
Josef Sipek | 3d5ff52 | 2006-12-08 02:37:38 -0800 | [diff] [blame] | 2092 | if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2093 | newsid = tsec->sid; |
| 2094 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2095 | if (tsec->sid == newsid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2096 | rc = avc_has_perm(tsec->sid, isec->sid, |
| 2097 | SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad); |
| 2098 | if (rc) |
| 2099 | return rc; |
| 2100 | } else { |
| 2101 | /* Check permissions for the transition. */ |
| 2102 | rc = avc_has_perm(tsec->sid, newsid, |
| 2103 | SECCLASS_PROCESS, PROCESS__TRANSITION, &ad); |
| 2104 | if (rc) |
| 2105 | return rc; |
| 2106 | |
| 2107 | rc = avc_has_perm(newsid, isec->sid, |
| 2108 | SECCLASS_FILE, FILE__ENTRYPOINT, &ad); |
| 2109 | if (rc) |
| 2110 | return rc; |
| 2111 | |
| 2112 | /* Clear any possibly unsafe personality bits on exec: */ |
| 2113 | current->personality &= ~PER_CLEAR_ON_SETID; |
| 2114 | |
| 2115 | /* Set the security field to the new SID. */ |
| 2116 | bsec->sid = newsid; |
| 2117 | } |
| 2118 | |
| 2119 | bsec->set = 1; |
| 2120 | return 0; |
| 2121 | } |
| 2122 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2123 | static int selinux_bprm_check_security(struct linux_binprm *bprm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2124 | { |
| 2125 | return secondary_ops->bprm_check_security(bprm); |
| 2126 | } |
| 2127 | |
| 2128 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2129 | static int selinux_bprm_secureexec(struct linux_binprm *bprm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2130 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2131 | const struct cred *cred = current_cred(); |
| 2132 | const struct task_security_struct *tsec = cred->security; |
| 2133 | u32 sid, osid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2134 | int atsecure = 0; |
| 2135 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2136 | sid = tsec->sid; |
| 2137 | osid = tsec->osid; |
| 2138 | |
| 2139 | if (osid != sid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2140 | /* Enable secure mode for SIDs transitions unless |
| 2141 | the noatsecure permission is granted between |
| 2142 | the two SIDs, i.e. ahp returns 0. */ |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2143 | atsecure = avc_has_perm(osid, sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2144 | SECCLASS_PROCESS, |
| 2145 | PROCESS__NOATSECURE, NULL); |
| 2146 | } |
| 2147 | |
| 2148 | return (atsecure || secondary_ops->bprm_secureexec(bprm)); |
| 2149 | } |
| 2150 | |
| 2151 | static void selinux_bprm_free_security(struct linux_binprm *bprm) |
| 2152 | { |
Jesper Juhl | 9a5f04b | 2005-06-25 14:58:51 -0700 | [diff] [blame] | 2153 | kfree(bprm->security); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2154 | bprm->security = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2155 | } |
| 2156 | |
| 2157 | extern struct vfsmount *selinuxfs_mount; |
| 2158 | extern struct dentry *selinux_null; |
| 2159 | |
| 2160 | /* Derived from fs/exec.c:flush_old_files. */ |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 2161 | static inline void flush_unauthorized_files(const struct cred *cred, |
| 2162 | struct files_struct *files) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2163 | { |
| 2164 | struct avc_audit_data ad; |
| 2165 | struct file *file, *devnull = NULL; |
Stephen Smalley | b20c812 | 2006-09-25 23:32:03 -0700 | [diff] [blame] | 2166 | struct tty_struct *tty; |
Dipankar Sarma | badf166 | 2005-09-09 13:04:10 -0700 | [diff] [blame] | 2167 | struct fdtable *fdt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2168 | long j = -1; |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 2169 | int drop_tty = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2170 | |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 2171 | tty = get_current_tty(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2172 | if (tty) { |
| 2173 | file_list_lock(); |
Eric Paris | 37dd0bd | 2008-10-31 17:40:00 -0400 | [diff] [blame] | 2174 | if (!list_empty(&tty->tty_files)) { |
| 2175 | struct inode *inode; |
| 2176 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2177 | /* Revalidate access to controlling tty. |
| 2178 | Use inode_has_perm on the tty inode directly rather |
| 2179 | than using file_has_perm, as this particular open |
| 2180 | file may belong to another process and we are only |
| 2181 | interested in the inode-based check here. */ |
Eric Paris | 37dd0bd | 2008-10-31 17:40:00 -0400 | [diff] [blame] | 2182 | file = list_first_entry(&tty->tty_files, struct file, f_u.fu_list); |
| 2183 | inode = file->f_path.dentry->d_inode; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2184 | if (inode_has_perm(cred, inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2185 | FILE__READ | FILE__WRITE, NULL)) { |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 2186 | drop_tty = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2187 | } |
| 2188 | } |
| 2189 | file_list_unlock(); |
Alan Cox | 452a00d | 2008-10-13 10:39:13 +0100 | [diff] [blame] | 2190 | tty_kref_put(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2191 | } |
Eric W. Biederman | 98a27ba | 2007-05-08 00:26:56 -0700 | [diff] [blame] | 2192 | /* Reset controlling tty. */ |
| 2193 | if (drop_tty) |
| 2194 | no_tty(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2195 | |
| 2196 | /* Revalidate access to inherited open files. */ |
| 2197 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2198 | AVC_AUDIT_DATA_INIT(&ad, FS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2199 | |
| 2200 | spin_lock(&files->file_lock); |
| 2201 | for (;;) { |
| 2202 | unsigned long set, i; |
| 2203 | int fd; |
| 2204 | |
| 2205 | j++; |
| 2206 | i = j * __NFDBITS; |
Dipankar Sarma | badf166 | 2005-09-09 13:04:10 -0700 | [diff] [blame] | 2207 | fdt = files_fdtable(files); |
Vadim Lobanov | bbea9f6 | 2006-12-10 02:21:12 -0800 | [diff] [blame] | 2208 | if (i >= fdt->max_fds) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2209 | break; |
Dipankar Sarma | badf166 | 2005-09-09 13:04:10 -0700 | [diff] [blame] | 2210 | set = fdt->open_fds->fds_bits[j]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2211 | if (!set) |
| 2212 | continue; |
| 2213 | spin_unlock(&files->file_lock); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2214 | for ( ; set ; i++, set >>= 1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2215 | if (set & 1) { |
| 2216 | file = fget(i); |
| 2217 | if (!file) |
| 2218 | continue; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2219 | if (file_has_perm(cred, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2220 | file, |
| 2221 | file_to_av(file))) { |
| 2222 | sys_close(i); |
| 2223 | fd = get_unused_fd(); |
| 2224 | if (fd != i) { |
| 2225 | if (fd >= 0) |
| 2226 | put_unused_fd(fd); |
| 2227 | fput(file); |
| 2228 | continue; |
| 2229 | } |
| 2230 | if (devnull) { |
Nick Piggin | 095975d | 2006-01-08 01:02:19 -0800 | [diff] [blame] | 2231 | get_file(devnull); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2232 | } else { |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 2233 | devnull = dentry_open( |
| 2234 | dget(selinux_null), |
| 2235 | mntget(selinuxfs_mount), |
| 2236 | O_RDWR, cred); |
Akinobu Mita | fc5d81e | 2006-11-27 15:16:48 +0900 | [diff] [blame] | 2237 | if (IS_ERR(devnull)) { |
| 2238 | devnull = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2239 | put_unused_fd(fd); |
| 2240 | fput(file); |
| 2241 | continue; |
| 2242 | } |
| 2243 | } |
| 2244 | fd_install(fd, devnull); |
| 2245 | } |
| 2246 | fput(file); |
| 2247 | } |
| 2248 | } |
| 2249 | spin_lock(&files->file_lock); |
| 2250 | |
| 2251 | } |
| 2252 | spin_unlock(&files->file_lock); |
| 2253 | } |
| 2254 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 2255 | static int selinux_bprm_apply_creds(struct linux_binprm *bprm, int unsafe) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2256 | { |
| 2257 | struct task_security_struct *tsec; |
| 2258 | struct bprm_security_struct *bsec; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 2259 | struct cred *new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2260 | u32 sid; |
| 2261 | int rc; |
| 2262 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 2263 | rc = secondary_ops->bprm_apply_creds(bprm, unsafe); |
| 2264 | if (rc < 0) |
| 2265 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2266 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 2267 | new = prepare_creds(); |
| 2268 | if (!new) |
| 2269 | return -ENOMEM; |
| 2270 | |
| 2271 | tsec = new->security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2272 | |
| 2273 | bsec = bprm->security; |
| 2274 | sid = bsec->sid; |
| 2275 | |
| 2276 | tsec->osid = tsec->sid; |
| 2277 | bsec->unsafe = 0; |
| 2278 | if (tsec->sid != sid) { |
| 2279 | /* Check for shared state. If not ok, leave SID |
| 2280 | unchanged and kill. */ |
| 2281 | if (unsafe & LSM_UNSAFE_SHARE) { |
| 2282 | rc = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS, |
| 2283 | PROCESS__SHARE, NULL); |
| 2284 | if (rc) { |
| 2285 | bsec->unsafe = 1; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 2286 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2287 | } |
| 2288 | } |
| 2289 | |
| 2290 | /* Check for ptracing, and update the task SID if ok. |
| 2291 | Otherwise, leave SID unchanged and kill. */ |
| 2292 | if (unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) { |
Roland McGrath | 0356357 | 2008-03-26 15:46:39 -0700 | [diff] [blame] | 2293 | struct task_struct *tracer; |
| 2294 | struct task_security_struct *sec; |
| 2295 | u32 ptsid = 0; |
| 2296 | |
| 2297 | rcu_read_lock(); |
Roland McGrath | 0d094ef | 2008-07-25 19:45:49 -0700 | [diff] [blame] | 2298 | tracer = tracehook_tracer_task(current); |
Roland McGrath | 0356357 | 2008-03-26 15:46:39 -0700 | [diff] [blame] | 2299 | if (likely(tracer != NULL)) { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2300 | sec = __task_cred(tracer)->security; |
Roland McGrath | 0356357 | 2008-03-26 15:46:39 -0700 | [diff] [blame] | 2301 | ptsid = sec->sid; |
| 2302 | } |
| 2303 | rcu_read_unlock(); |
| 2304 | |
| 2305 | if (ptsid != 0) { |
| 2306 | rc = avc_has_perm(ptsid, sid, SECCLASS_PROCESS, |
| 2307 | PROCESS__PTRACE, NULL); |
| 2308 | if (rc) { |
| 2309 | bsec->unsafe = 1; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 2310 | goto out; |
Roland McGrath | 0356357 | 2008-03-26 15:46:39 -0700 | [diff] [blame] | 2311 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2312 | } |
| 2313 | } |
| 2314 | tsec->sid = sid; |
| 2315 | } |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 2316 | |
| 2317 | out: |
| 2318 | commit_creds(new); |
| 2319 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2320 | } |
| 2321 | |
| 2322 | /* |
| 2323 | * called after apply_creds without the task lock held |
| 2324 | */ |
| 2325 | static void selinux_bprm_post_apply_creds(struct linux_binprm *bprm) |
| 2326 | { |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 2327 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2328 | struct task_security_struct *tsec; |
| 2329 | struct rlimit *rlim, *initrlim; |
| 2330 | struct itimerval itimer; |
| 2331 | struct bprm_security_struct *bsec; |
Eric Paris | 41d9f9c | 2008-11-04 15:18:26 -0500 | [diff] [blame] | 2332 | struct sighand_struct *psig; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2333 | int rc, i; |
Eric Paris | 41d9f9c | 2008-11-04 15:18:26 -0500 | [diff] [blame] | 2334 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2335 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2336 | tsec = current_security(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2337 | bsec = bprm->security; |
| 2338 | |
| 2339 | if (bsec->unsafe) { |
| 2340 | force_sig_specific(SIGKILL, current); |
| 2341 | return; |
| 2342 | } |
| 2343 | if (tsec->osid == tsec->sid) |
| 2344 | return; |
| 2345 | |
| 2346 | /* Close files for which the new task SID is not authorized. */ |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 2347 | flush_unauthorized_files(cred, current->files); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2348 | |
| 2349 | /* Check whether the new SID can inherit signal state |
| 2350 | from the old SID. If not, clear itimers to avoid |
| 2351 | subsequent signal generation and flush and unblock |
| 2352 | signals. This must occur _after_ the task SID has |
| 2353 | been updated so that any kill done after the flush |
| 2354 | will be checked against the new SID. */ |
| 2355 | rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS, |
| 2356 | PROCESS__SIGINH, NULL); |
| 2357 | if (rc) { |
| 2358 | memset(&itimer, 0, sizeof itimer); |
| 2359 | for (i = 0; i < 3; i++) |
| 2360 | do_setitimer(i, &itimer, NULL); |
| 2361 | flush_signals(current); |
| 2362 | spin_lock_irq(¤t->sighand->siglock); |
| 2363 | flush_signal_handlers(current, 1); |
| 2364 | sigemptyset(¤t->blocked); |
| 2365 | recalc_sigpending(); |
| 2366 | spin_unlock_irq(¤t->sighand->siglock); |
| 2367 | } |
| 2368 | |
Stephen Smalley | 4ac212a | 2007-08-29 08:51:50 -0400 | [diff] [blame] | 2369 | /* Always clear parent death signal on SID transitions. */ |
| 2370 | current->pdeath_signal = 0; |
| 2371 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2372 | /* Check whether the new SID can inherit resource limits |
| 2373 | from the old SID. If not, reset all soft limits to |
| 2374 | the lower of the current task's hard limit and the init |
| 2375 | task's soft limit. Note that the setting of hard limits |
| 2376 | (even to lower them) can be controlled by the setrlimit |
| 2377 | check. The inclusion of the init task's soft limit into |
| 2378 | the computation is to avoid resetting soft limits higher |
| 2379 | than the default soft limit for cases where the default |
| 2380 | is lower than the hard limit, e.g. RLIMIT_CORE or |
| 2381 | RLIMIT_STACK.*/ |
| 2382 | rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS, |
| 2383 | PROCESS__RLIMITINH, NULL); |
| 2384 | if (rc) { |
| 2385 | for (i = 0; i < RLIM_NLIMITS; i++) { |
| 2386 | rlim = current->signal->rlim + i; |
| 2387 | initrlim = init_task.signal->rlim+i; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2388 | rlim->rlim_cur = min(rlim->rlim_max, initrlim->rlim_cur); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2389 | } |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 2390 | update_rlimit_cpu(rlim->rlim_cur); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2391 | } |
| 2392 | |
| 2393 | /* Wake up the parent if it is waiting so that it can |
| 2394 | recheck wait permission to the new task SID. */ |
Eric Paris | 41d9f9c | 2008-11-04 15:18:26 -0500 | [diff] [blame] | 2395 | read_lock_irq(&tasklist_lock); |
| 2396 | psig = current->parent->sighand; |
| 2397 | spin_lock_irqsave(&psig->siglock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2398 | wake_up_interruptible(¤t->parent->signal->wait_chldexit); |
Eric Paris | 41d9f9c | 2008-11-04 15:18:26 -0500 | [diff] [blame] | 2399 | spin_unlock_irqrestore(&psig->siglock, flags); |
| 2400 | read_unlock_irq(&tasklist_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2401 | } |
| 2402 | |
| 2403 | /* superblock security operations */ |
| 2404 | |
| 2405 | static int selinux_sb_alloc_security(struct super_block *sb) |
| 2406 | { |
| 2407 | return superblock_alloc_security(sb); |
| 2408 | } |
| 2409 | |
| 2410 | static void selinux_sb_free_security(struct super_block *sb) |
| 2411 | { |
| 2412 | superblock_free_security(sb); |
| 2413 | } |
| 2414 | |
| 2415 | static inline int match_prefix(char *prefix, int plen, char *option, int olen) |
| 2416 | { |
| 2417 | if (plen > olen) |
| 2418 | return 0; |
| 2419 | |
| 2420 | return !memcmp(prefix, option, plen); |
| 2421 | } |
| 2422 | |
| 2423 | static inline int selinux_option(char *option, int len) |
| 2424 | { |
Eric Paris | 832cbd9 | 2008-04-01 13:24:09 -0400 | [diff] [blame] | 2425 | return (match_prefix(CONTEXT_STR, sizeof(CONTEXT_STR)-1, option, len) || |
| 2426 | match_prefix(FSCONTEXT_STR, sizeof(FSCONTEXT_STR)-1, option, len) || |
| 2427 | match_prefix(DEFCONTEXT_STR, sizeof(DEFCONTEXT_STR)-1, option, len) || |
| 2428 | match_prefix(ROOTCONTEXT_STR, sizeof(ROOTCONTEXT_STR)-1, option, len)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2429 | } |
| 2430 | |
| 2431 | static inline void take_option(char **to, char *from, int *first, int len) |
| 2432 | { |
| 2433 | if (!*first) { |
| 2434 | **to = ','; |
| 2435 | *to += 1; |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2436 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2437 | *first = 0; |
| 2438 | memcpy(*to, from, len); |
| 2439 | *to += len; |
| 2440 | } |
| 2441 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2442 | static inline void take_selinux_option(char **to, char *from, int *first, |
| 2443 | int len) |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2444 | { |
| 2445 | int current_size = 0; |
| 2446 | |
| 2447 | if (!*first) { |
| 2448 | **to = '|'; |
| 2449 | *to += 1; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2450 | } else |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2451 | *first = 0; |
| 2452 | |
| 2453 | while (current_size < len) { |
| 2454 | if (*from != '"') { |
| 2455 | **to = *from; |
| 2456 | *to += 1; |
| 2457 | } |
| 2458 | from += 1; |
| 2459 | current_size += 1; |
| 2460 | } |
| 2461 | } |
| 2462 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 2463 | static int selinux_sb_copy_data(char *orig, char *copy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2464 | { |
| 2465 | int fnosec, fsec, rc = 0; |
| 2466 | char *in_save, *in_curr, *in_end; |
| 2467 | char *sec_curr, *nosec_save, *nosec; |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2468 | int open_quote = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2469 | |
| 2470 | in_curr = orig; |
| 2471 | sec_curr = copy; |
| 2472 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2473 | nosec = (char *)get_zeroed_page(GFP_KERNEL); |
| 2474 | if (!nosec) { |
| 2475 | rc = -ENOMEM; |
| 2476 | goto out; |
| 2477 | } |
| 2478 | |
| 2479 | nosec_save = nosec; |
| 2480 | fnosec = fsec = 1; |
| 2481 | in_save = in_end = orig; |
| 2482 | |
| 2483 | do { |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2484 | if (*in_end == '"') |
| 2485 | open_quote = !open_quote; |
| 2486 | if ((*in_end == ',' && open_quote == 0) || |
| 2487 | *in_end == '\0') { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2488 | int len = in_end - in_curr; |
| 2489 | |
| 2490 | if (selinux_option(in_curr, len)) |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2491 | take_selinux_option(&sec_curr, in_curr, &fsec, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2492 | else |
| 2493 | take_option(&nosec, in_curr, &fnosec, len); |
| 2494 | |
| 2495 | in_curr = in_end + 1; |
| 2496 | } |
| 2497 | } while (*in_end++); |
| 2498 | |
Eric Paris | 6931dfc | 2005-06-30 02:58:51 -0700 | [diff] [blame] | 2499 | strcpy(in_save, nosec_save); |
Gerald Schaefer | da3caa2 | 2005-06-21 17:15:18 -0700 | [diff] [blame] | 2500 | free_page((unsigned long)nosec_save); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2501 | out: |
| 2502 | return rc; |
| 2503 | } |
| 2504 | |
| 2505 | static int selinux_sb_kern_mount(struct super_block *sb, void *data) |
| 2506 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2507 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2508 | struct avc_audit_data ad; |
| 2509 | int rc; |
| 2510 | |
| 2511 | rc = superblock_doinit(sb, data); |
| 2512 | if (rc) |
| 2513 | return rc; |
| 2514 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2515 | AVC_AUDIT_DATA_INIT(&ad, FS); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 2516 | ad.u.fs.path.dentry = sb->s_root; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2517 | return superblock_has_perm(cred, sb, FILESYSTEM__MOUNT, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2518 | } |
| 2519 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 2520 | static int selinux_sb_statfs(struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2521 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2522 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2523 | struct avc_audit_data ad; |
| 2524 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2525 | AVC_AUDIT_DATA_INIT(&ad, FS); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 2526 | ad.u.fs.path.dentry = dentry->d_sb->s_root; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2527 | return superblock_has_perm(cred, dentry->d_sb, FILESYSTEM__GETATTR, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2528 | } |
| 2529 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2530 | static int selinux_mount(char *dev_name, |
Al Viro | b5266eb | 2008-03-22 17:48:24 -0400 | [diff] [blame] | 2531 | struct path *path, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2532 | char *type, |
| 2533 | unsigned long flags, |
| 2534 | void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2535 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2536 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2537 | int rc; |
| 2538 | |
Al Viro | b5266eb | 2008-03-22 17:48:24 -0400 | [diff] [blame] | 2539 | rc = secondary_ops->sb_mount(dev_name, path, type, flags, data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2540 | if (rc) |
| 2541 | return rc; |
| 2542 | |
| 2543 | if (flags & MS_REMOUNT) |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2544 | return superblock_has_perm(cred, path->mnt->mnt_sb, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2545 | FILESYSTEM__REMOUNT, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2546 | else |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2547 | return dentry_has_perm(cred, path->mnt, path->dentry, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2548 | FILE__MOUNTON); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2549 | } |
| 2550 | |
| 2551 | static int selinux_umount(struct vfsmount *mnt, int flags) |
| 2552 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2553 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2554 | int rc; |
| 2555 | |
| 2556 | rc = secondary_ops->sb_umount(mnt, flags); |
| 2557 | if (rc) |
| 2558 | return rc; |
| 2559 | |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2560 | return superblock_has_perm(cred, mnt->mnt_sb, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2561 | FILESYSTEM__UNMOUNT, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2562 | } |
| 2563 | |
| 2564 | /* inode security operations */ |
| 2565 | |
| 2566 | static int selinux_inode_alloc_security(struct inode *inode) |
| 2567 | { |
| 2568 | return inode_alloc_security(inode); |
| 2569 | } |
| 2570 | |
| 2571 | static void selinux_inode_free_security(struct inode *inode) |
| 2572 | { |
| 2573 | inode_free_security(inode); |
| 2574 | } |
| 2575 | |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2576 | static int selinux_inode_init_security(struct inode *inode, struct inode *dir, |
| 2577 | char **name, void **value, |
| 2578 | size_t *len) |
| 2579 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2580 | const struct cred *cred = current_cred(); |
| 2581 | const struct task_security_struct *tsec = cred->security; |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2582 | struct inode_security_struct *dsec; |
| 2583 | struct superblock_security_struct *sbsec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2584 | u32 sid, newsid, clen; |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2585 | int rc; |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 2586 | char *namep = NULL, *context; |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2587 | |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2588 | dsec = dir->i_security; |
| 2589 | sbsec = dir->i_sb->s_security; |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2590 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2591 | sid = tsec->sid; |
| 2592 | newsid = tsec->create_sid; |
| 2593 | |
| 2594 | if (!newsid || sbsec->behavior == SECURITY_FS_USE_MNTPOINT) { |
| 2595 | rc = security_transition_sid(sid, dsec->sid, |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2596 | inode_mode_to_security_class(inode->i_mode), |
| 2597 | &newsid); |
| 2598 | if (rc) { |
| 2599 | printk(KERN_WARNING "%s: " |
| 2600 | "security_transition_sid failed, rc=%d (dev=%s " |
| 2601 | "ino=%ld)\n", |
Harvey Harrison | dd6f953 | 2008-03-06 10:03:59 +1100 | [diff] [blame] | 2602 | __func__, |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2603 | -rc, inode->i_sb->s_id, inode->i_ino); |
| 2604 | return rc; |
| 2605 | } |
| 2606 | } |
| 2607 | |
Eric Paris | 296fddf | 2006-09-25 23:32:00 -0700 | [diff] [blame] | 2608 | /* Possibly defer initialization to selinux_complete_init. */ |
| 2609 | if (sbsec->initialized) { |
| 2610 | struct inode_security_struct *isec = inode->i_security; |
| 2611 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
| 2612 | isec->sid = newsid; |
| 2613 | isec->initialized = 1; |
| 2614 | } |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2615 | |
Stephen Smalley | 8aad387 | 2006-03-22 00:09:13 -0800 | [diff] [blame] | 2616 | if (!ss_initialized || sbsec->behavior == SECURITY_FS_USE_MNTPOINT) |
Stephen Smalley | 25a74f3 | 2005-11-08 21:34:33 -0800 | [diff] [blame] | 2617 | return -EOPNOTSUPP; |
| 2618 | |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 2619 | if (name) { |
Josef Bacik | a02fe13 | 2008-04-04 09:35:05 +1100 | [diff] [blame] | 2620 | namep = kstrdup(XATTR_SELINUX_SUFFIX, GFP_NOFS); |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 2621 | if (!namep) |
| 2622 | return -ENOMEM; |
| 2623 | *name = namep; |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2624 | } |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 2625 | |
| 2626 | if (value && len) { |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 2627 | rc = security_sid_to_context_force(newsid, &context, &clen); |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 2628 | if (rc) { |
| 2629 | kfree(namep); |
| 2630 | return rc; |
| 2631 | } |
| 2632 | *value = context; |
| 2633 | *len = clen; |
| 2634 | } |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2635 | |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2636 | return 0; |
| 2637 | } |
| 2638 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2639 | static int selinux_inode_create(struct inode *dir, struct dentry *dentry, int mask) |
| 2640 | { |
| 2641 | return may_create(dir, dentry, SECCLASS_FILE); |
| 2642 | } |
| 2643 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2644 | static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry) |
| 2645 | { |
| 2646 | int rc; |
| 2647 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2648 | rc = secondary_ops->inode_link(old_dentry, dir, new_dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2649 | if (rc) |
| 2650 | return rc; |
| 2651 | return may_link(dir, old_dentry, MAY_LINK); |
| 2652 | } |
| 2653 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2654 | static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry) |
| 2655 | { |
| 2656 | int rc; |
| 2657 | |
| 2658 | rc = secondary_ops->inode_unlink(dir, dentry); |
| 2659 | if (rc) |
| 2660 | return rc; |
| 2661 | return may_link(dir, dentry, MAY_UNLINK); |
| 2662 | } |
| 2663 | |
| 2664 | static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const char *name) |
| 2665 | { |
| 2666 | return may_create(dir, dentry, SECCLASS_LNK_FILE); |
| 2667 | } |
| 2668 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2669 | static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, int mask) |
| 2670 | { |
| 2671 | return may_create(dir, dentry, SECCLASS_DIR); |
| 2672 | } |
| 2673 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2674 | static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry) |
| 2675 | { |
| 2676 | return may_link(dir, dentry, MAY_RMDIR); |
| 2677 | } |
| 2678 | |
| 2679 | static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) |
| 2680 | { |
| 2681 | int rc; |
| 2682 | |
| 2683 | rc = secondary_ops->inode_mknod(dir, dentry, mode, dev); |
| 2684 | if (rc) |
| 2685 | return rc; |
| 2686 | |
| 2687 | return may_create(dir, dentry, inode_mode_to_security_class(mode)); |
| 2688 | } |
| 2689 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2690 | static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2691 | struct inode *new_inode, struct dentry *new_dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2692 | { |
| 2693 | return may_rename(old_inode, old_dentry, new_inode, new_dentry); |
| 2694 | } |
| 2695 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2696 | static int selinux_inode_readlink(struct dentry *dentry) |
| 2697 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2698 | const struct cred *cred = current_cred(); |
| 2699 | |
| 2700 | return dentry_has_perm(cred, NULL, dentry, FILE__READ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2701 | } |
| 2702 | |
| 2703 | static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *nameidata) |
| 2704 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2705 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2706 | int rc; |
| 2707 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2708 | rc = secondary_ops->inode_follow_link(dentry, nameidata); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2709 | if (rc) |
| 2710 | return rc; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2711 | return dentry_has_perm(cred, NULL, dentry, FILE__READ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2712 | } |
| 2713 | |
Al Viro | b77b064 | 2008-07-17 09:37:02 -0400 | [diff] [blame] | 2714 | static int selinux_inode_permission(struct inode *inode, int mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2715 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2716 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2717 | int rc; |
| 2718 | |
Al Viro | b77b064 | 2008-07-17 09:37:02 -0400 | [diff] [blame] | 2719 | rc = secondary_ops->inode_permission(inode, mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2720 | if (rc) |
| 2721 | return rc; |
| 2722 | |
| 2723 | if (!mask) { |
| 2724 | /* No permission to check. Existence test. */ |
| 2725 | return 0; |
| 2726 | } |
| 2727 | |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2728 | return inode_has_perm(cred, inode, |
Eric Paris | 8b6a5a3 | 2008-10-29 17:06:46 -0400 | [diff] [blame] | 2729 | file_mask_to_av(inode->i_mode, mask), NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2730 | } |
| 2731 | |
| 2732 | static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr) |
| 2733 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2734 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2735 | int rc; |
| 2736 | |
| 2737 | rc = secondary_ops->inode_setattr(dentry, iattr); |
| 2738 | if (rc) |
| 2739 | return rc; |
| 2740 | |
| 2741 | if (iattr->ia_valid & ATTR_FORCE) |
| 2742 | return 0; |
| 2743 | |
| 2744 | if (iattr->ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | |
| 2745 | ATTR_ATIME_SET | ATTR_MTIME_SET)) |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2746 | return dentry_has_perm(cred, NULL, dentry, FILE__SETATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2747 | |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2748 | return dentry_has_perm(cred, NULL, dentry, FILE__WRITE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2749 | } |
| 2750 | |
| 2751 | static int selinux_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) |
| 2752 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2753 | const struct cred *cred = current_cred(); |
| 2754 | |
| 2755 | return dentry_has_perm(cred, mnt, dentry, FILE__GETATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2756 | } |
| 2757 | |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 2758 | static int selinux_inode_setotherxattr(struct dentry *dentry, const char *name) |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 2759 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2760 | const struct cred *cred = current_cred(); |
| 2761 | |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 2762 | if (!strncmp(name, XATTR_SECURITY_PREFIX, |
| 2763 | sizeof XATTR_SECURITY_PREFIX - 1)) { |
| 2764 | if (!strcmp(name, XATTR_NAME_CAPS)) { |
| 2765 | if (!capable(CAP_SETFCAP)) |
| 2766 | return -EPERM; |
| 2767 | } else if (!capable(CAP_SYS_ADMIN)) { |
| 2768 | /* A different attribute in the security namespace. |
| 2769 | Restrict to administrator. */ |
| 2770 | return -EPERM; |
| 2771 | } |
| 2772 | } |
| 2773 | |
| 2774 | /* Not an attribute we recognize, so just check the |
| 2775 | ordinary setattr permission. */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2776 | return dentry_has_perm(cred, NULL, dentry, FILE__SETATTR); |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 2777 | } |
| 2778 | |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 2779 | static int selinux_inode_setxattr(struct dentry *dentry, const char *name, |
| 2780 | const void *value, size_t size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2781 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2782 | struct inode *inode = dentry->d_inode; |
| 2783 | struct inode_security_struct *isec = inode->i_security; |
| 2784 | struct superblock_security_struct *sbsec; |
| 2785 | struct avc_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2786 | u32 newsid, sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2787 | int rc = 0; |
| 2788 | |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 2789 | if (strcmp(name, XATTR_NAME_SELINUX)) |
| 2790 | return selinux_inode_setotherxattr(dentry, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2791 | |
| 2792 | sbsec = inode->i_sb->s_security; |
| 2793 | if (sbsec->behavior == SECURITY_FS_USE_MNTPOINT) |
| 2794 | return -EOPNOTSUPP; |
| 2795 | |
Satyam Sharma | 3bd858a | 2007-07-17 15:00:08 +0530 | [diff] [blame] | 2796 | if (!is_owner_or_cap(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2797 | return -EPERM; |
| 2798 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2799 | AVC_AUDIT_DATA_INIT(&ad, FS); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 2800 | ad.u.fs.path.dentry = dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2801 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2802 | rc = avc_has_perm(sid, isec->sid, isec->sclass, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2803 | FILE__RELABELFROM, &ad); |
| 2804 | if (rc) |
| 2805 | return rc; |
| 2806 | |
| 2807 | rc = security_context_to_sid(value, size, &newsid); |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 2808 | if (rc == -EINVAL) { |
| 2809 | if (!capable(CAP_MAC_ADMIN)) |
| 2810 | return rc; |
| 2811 | rc = security_context_to_sid_force(value, size, &newsid); |
| 2812 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2813 | if (rc) |
| 2814 | return rc; |
| 2815 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2816 | rc = avc_has_perm(sid, newsid, isec->sclass, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2817 | FILE__RELABELTO, &ad); |
| 2818 | if (rc) |
| 2819 | return rc; |
| 2820 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2821 | rc = security_validate_transition(isec->sid, newsid, sid, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2822 | isec->sclass); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2823 | if (rc) |
| 2824 | return rc; |
| 2825 | |
| 2826 | return avc_has_perm(newsid, |
| 2827 | sbsec->sid, |
| 2828 | SECCLASS_FILESYSTEM, |
| 2829 | FILESYSTEM__ASSOCIATE, |
| 2830 | &ad); |
| 2831 | } |
| 2832 | |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 2833 | static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name, |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 2834 | const void *value, size_t size, |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 2835 | int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2836 | { |
| 2837 | struct inode *inode = dentry->d_inode; |
| 2838 | struct inode_security_struct *isec = inode->i_security; |
| 2839 | u32 newsid; |
| 2840 | int rc; |
| 2841 | |
| 2842 | if (strcmp(name, XATTR_NAME_SELINUX)) { |
| 2843 | /* Not an attribute we recognize, so nothing to do. */ |
| 2844 | return; |
| 2845 | } |
| 2846 | |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 2847 | rc = security_context_to_sid_force(value, size, &newsid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2848 | if (rc) { |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 2849 | printk(KERN_ERR "SELinux: unable to map context to SID" |
| 2850 | "for (%s, %lu), rc=%d\n", |
| 2851 | inode->i_sb->s_id, inode->i_ino, -rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2852 | return; |
| 2853 | } |
| 2854 | |
| 2855 | isec->sid = newsid; |
| 2856 | return; |
| 2857 | } |
| 2858 | |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 2859 | static int selinux_inode_getxattr(struct dentry *dentry, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2860 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2861 | const struct cred *cred = current_cred(); |
| 2862 | |
| 2863 | return dentry_has_perm(cred, NULL, dentry, FILE__GETATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2864 | } |
| 2865 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2866 | static int selinux_inode_listxattr(struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2867 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2868 | const struct cred *cred = current_cred(); |
| 2869 | |
| 2870 | return dentry_has_perm(cred, NULL, dentry, FILE__GETATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2871 | } |
| 2872 | |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 2873 | static int selinux_inode_removexattr(struct dentry *dentry, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2874 | { |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 2875 | if (strcmp(name, XATTR_NAME_SELINUX)) |
| 2876 | return selinux_inode_setotherxattr(dentry, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2877 | |
| 2878 | /* No one is allowed to remove a SELinux security label. |
| 2879 | You can change the label, but all data must be labeled. */ |
| 2880 | return -EACCES; |
| 2881 | } |
| 2882 | |
James Morris | d381d8a | 2005-10-30 14:59:22 -0800 | [diff] [blame] | 2883 | /* |
Stephen Smalley | abc69bb | 2008-05-21 14:16:12 -0400 | [diff] [blame] | 2884 | * Copy the inode security context value to the user. |
James Morris | d381d8a | 2005-10-30 14:59:22 -0800 | [diff] [blame] | 2885 | * |
| 2886 | * Permission check is handled by selinux_inode_getxattr hook. |
| 2887 | */ |
David P. Quigley | 4249259 | 2008-02-04 22:29:39 -0800 | [diff] [blame] | 2888 | static int selinux_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2889 | { |
David P. Quigley | 4249259 | 2008-02-04 22:29:39 -0800 | [diff] [blame] | 2890 | u32 size; |
| 2891 | int error; |
| 2892 | char *context = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2893 | struct inode_security_struct *isec = inode->i_security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2894 | |
Dustin Kirkland | 8c8570f | 2005-11-03 17:15:16 +0000 | [diff] [blame] | 2895 | if (strcmp(name, XATTR_SELINUX_SUFFIX)) |
| 2896 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2897 | |
Stephen Smalley | abc69bb | 2008-05-21 14:16:12 -0400 | [diff] [blame] | 2898 | /* |
| 2899 | * If the caller has CAP_MAC_ADMIN, then get the raw context |
| 2900 | * value even if it is not defined by current policy; otherwise, |
| 2901 | * use the in-core value under current policy. |
| 2902 | * Use the non-auditing forms of the permission checks since |
| 2903 | * getxattr may be called by unprivileged processes commonly |
| 2904 | * and lack of permission just means that we fall back to the |
| 2905 | * in-core context value, not a denial. |
| 2906 | */ |
Eric Paris | 0667467 | 2008-11-11 22:02:57 +1100 | [diff] [blame] | 2907 | error = selinux_capable(current, CAP_MAC_ADMIN, SECURITY_CAP_NOAUDIT); |
Stephen Smalley | abc69bb | 2008-05-21 14:16:12 -0400 | [diff] [blame] | 2908 | if (!error) |
| 2909 | error = security_sid_to_context_force(isec->sid, &context, |
| 2910 | &size); |
| 2911 | else |
| 2912 | error = security_sid_to_context(isec->sid, &context, &size); |
David P. Quigley | 4249259 | 2008-02-04 22:29:39 -0800 | [diff] [blame] | 2913 | if (error) |
| 2914 | return error; |
| 2915 | error = size; |
| 2916 | if (alloc) { |
| 2917 | *buffer = context; |
| 2918 | goto out_nofree; |
| 2919 | } |
| 2920 | kfree(context); |
| 2921 | out_nofree: |
| 2922 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2923 | } |
| 2924 | |
| 2925 | static int selinux_inode_setsecurity(struct inode *inode, const char *name, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2926 | const void *value, size_t size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2927 | { |
| 2928 | struct inode_security_struct *isec = inode->i_security; |
| 2929 | u32 newsid; |
| 2930 | int rc; |
| 2931 | |
| 2932 | if (strcmp(name, XATTR_SELINUX_SUFFIX)) |
| 2933 | return -EOPNOTSUPP; |
| 2934 | |
| 2935 | if (!value || !size) |
| 2936 | return -EACCES; |
| 2937 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2938 | rc = security_context_to_sid((void *)value, size, &newsid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2939 | if (rc) |
| 2940 | return rc; |
| 2941 | |
| 2942 | isec->sid = newsid; |
| 2943 | return 0; |
| 2944 | } |
| 2945 | |
| 2946 | static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size) |
| 2947 | { |
| 2948 | const int len = sizeof(XATTR_NAME_SELINUX); |
| 2949 | if (buffer && len <= buffer_size) |
| 2950 | memcpy(buffer, XATTR_NAME_SELINUX, len); |
| 2951 | return len; |
| 2952 | } |
| 2953 | |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 2954 | static int selinux_inode_need_killpriv(struct dentry *dentry) |
| 2955 | { |
| 2956 | return secondary_ops->inode_need_killpriv(dentry); |
| 2957 | } |
| 2958 | |
| 2959 | static int selinux_inode_killpriv(struct dentry *dentry) |
| 2960 | { |
| 2961 | return secondary_ops->inode_killpriv(dentry); |
| 2962 | } |
| 2963 | |
Ahmed S. Darwish | 713a04a | 2008-03-01 21:52:30 +0200 | [diff] [blame] | 2964 | static void selinux_inode_getsecid(const struct inode *inode, u32 *secid) |
| 2965 | { |
| 2966 | struct inode_security_struct *isec = inode->i_security; |
| 2967 | *secid = isec->sid; |
| 2968 | } |
| 2969 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2970 | /* file security operations */ |
| 2971 | |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 2972 | static int selinux_revalidate_file_permission(struct file *file, int mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2973 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2974 | const struct cred *cred = current_cred(); |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 2975 | int rc; |
Josef Sipek | 3d5ff52 | 2006-12-08 02:37:38 -0800 | [diff] [blame] | 2976 | struct inode *inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2977 | |
| 2978 | if (!mask) { |
| 2979 | /* No permission to check. Existence test. */ |
| 2980 | return 0; |
| 2981 | } |
| 2982 | |
| 2983 | /* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */ |
| 2984 | if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE)) |
| 2985 | mask |= MAY_APPEND; |
| 2986 | |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2987 | rc = file_has_perm(cred, file, |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 2988 | file_mask_to_av(inode->i_mode, mask)); |
| 2989 | if (rc) |
| 2990 | return rc; |
| 2991 | |
| 2992 | return selinux_netlbl_inode_permission(inode, mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2993 | } |
| 2994 | |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 2995 | static int selinux_file_permission(struct file *file, int mask) |
| 2996 | { |
| 2997 | struct inode *inode = file->f_path.dentry->d_inode; |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 2998 | struct file_security_struct *fsec = file->f_security; |
| 2999 | struct inode_security_struct *isec = inode->i_security; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3000 | u32 sid = current_sid(); |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 3001 | |
| 3002 | if (!mask) { |
| 3003 | /* No permission to check. Existence test. */ |
| 3004 | return 0; |
| 3005 | } |
| 3006 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3007 | if (sid == fsec->sid && fsec->isid == isec->sid |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 3008 | && fsec->pseqno == avc_policy_seqno()) |
| 3009 | return selinux_netlbl_inode_permission(inode, mask); |
| 3010 | |
| 3011 | return selinux_revalidate_file_permission(file, mask); |
| 3012 | } |
| 3013 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3014 | static int selinux_file_alloc_security(struct file *file) |
| 3015 | { |
| 3016 | return file_alloc_security(file); |
| 3017 | } |
| 3018 | |
| 3019 | static void selinux_file_free_security(struct file *file) |
| 3020 | { |
| 3021 | file_free_security(file); |
| 3022 | } |
| 3023 | |
| 3024 | static int selinux_file_ioctl(struct file *file, unsigned int cmd, |
| 3025 | unsigned long arg) |
| 3026 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3027 | const struct cred *cred = current_cred(); |
Stephen Smalley | 242631c | 2008-06-05 09:21:28 -0400 | [diff] [blame] | 3028 | u32 av = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3029 | |
Stephen Smalley | 242631c | 2008-06-05 09:21:28 -0400 | [diff] [blame] | 3030 | if (_IOC_DIR(cmd) & _IOC_WRITE) |
| 3031 | av |= FILE__WRITE; |
| 3032 | if (_IOC_DIR(cmd) & _IOC_READ) |
| 3033 | av |= FILE__READ; |
| 3034 | if (!av) |
| 3035 | av = FILE__IOCTL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3036 | |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3037 | return file_has_perm(cred, file, av); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3038 | } |
| 3039 | |
| 3040 | static int file_map_prot_check(struct file *file, unsigned long prot, int shared) |
| 3041 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3042 | const struct cred *cred = current_cred(); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 3043 | int rc = 0; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3044 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3045 | #ifndef CONFIG_PPC32 |
| 3046 | if ((prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) { |
| 3047 | /* |
| 3048 | * We are making executable an anonymous mapping or a |
| 3049 | * private file mapping that will also be writable. |
| 3050 | * This has an additional check. |
| 3051 | */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 3052 | rc = cred_has_perm(cred, cred, PROCESS__EXECMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3053 | if (rc) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 3054 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3055 | } |
| 3056 | #endif |
| 3057 | |
| 3058 | if (file) { |
| 3059 | /* read access is always possible with a mapping */ |
| 3060 | u32 av = FILE__READ; |
| 3061 | |
| 3062 | /* write access only matters if the mapping is shared */ |
| 3063 | if (shared && (prot & PROT_WRITE)) |
| 3064 | av |= FILE__WRITE; |
| 3065 | |
| 3066 | if (prot & PROT_EXEC) |
| 3067 | av |= FILE__EXECUTE; |
| 3068 | |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3069 | return file_has_perm(cred, file, av); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3070 | } |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 3071 | |
| 3072 | error: |
| 3073 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3074 | } |
| 3075 | |
| 3076 | static int selinux_file_mmap(struct file *file, unsigned long reqprot, |
Eric Paris | ed03218 | 2007-06-28 15:55:21 -0400 | [diff] [blame] | 3077 | unsigned long prot, unsigned long flags, |
| 3078 | unsigned long addr, unsigned long addr_only) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3079 | { |
Eric Paris | ed03218 | 2007-06-28 15:55:21 -0400 | [diff] [blame] | 3080 | int rc = 0; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3081 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3082 | |
Eric Paris | ed03218 | 2007-06-28 15:55:21 -0400 | [diff] [blame] | 3083 | if (addr < mmap_min_addr) |
| 3084 | rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT, |
| 3085 | MEMPROTECT__MMAP_ZERO, NULL); |
| 3086 | if (rc || addr_only) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3087 | return rc; |
| 3088 | |
| 3089 | if (selinux_checkreqprot) |
| 3090 | prot = reqprot; |
| 3091 | |
| 3092 | return file_map_prot_check(file, prot, |
| 3093 | (flags & MAP_TYPE) == MAP_SHARED); |
| 3094 | } |
| 3095 | |
| 3096 | static int selinux_file_mprotect(struct vm_area_struct *vma, |
| 3097 | unsigned long reqprot, |
| 3098 | unsigned long prot) |
| 3099 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3100 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3101 | int rc; |
| 3102 | |
| 3103 | rc = secondary_ops->file_mprotect(vma, reqprot, prot); |
| 3104 | if (rc) |
| 3105 | return rc; |
| 3106 | |
| 3107 | if (selinux_checkreqprot) |
| 3108 | prot = reqprot; |
| 3109 | |
| 3110 | #ifndef CONFIG_PPC32 |
Stephen Smalley | db4c964 | 2006-02-01 03:05:54 -0800 | [diff] [blame] | 3111 | if ((prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) { |
| 3112 | rc = 0; |
| 3113 | if (vma->vm_start >= vma->vm_mm->start_brk && |
| 3114 | vma->vm_end <= vma->vm_mm->brk) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 3115 | rc = cred_has_perm(cred, cred, PROCESS__EXECHEAP); |
Stephen Smalley | db4c964 | 2006-02-01 03:05:54 -0800 | [diff] [blame] | 3116 | } else if (!vma->vm_file && |
| 3117 | vma->vm_start <= vma->vm_mm->start_stack && |
| 3118 | vma->vm_end >= vma->vm_mm->start_stack) { |
| 3119 | rc = task_has_perm(current, current, PROCESS__EXECSTACK); |
| 3120 | } else if (vma->vm_file && vma->anon_vma) { |
| 3121 | /* |
| 3122 | * We are making executable a file mapping that has |
| 3123 | * had some COW done. Since pages might have been |
| 3124 | * written, check ability to execute the possibly |
| 3125 | * modified content. This typically should only |
| 3126 | * occur for text relocations. |
| 3127 | */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 3128 | rc = file_has_perm(cred, vma->vm_file, FILE__EXECMOD); |
Stephen Smalley | db4c964 | 2006-02-01 03:05:54 -0800 | [diff] [blame] | 3129 | } |
Lorenzo Hernandez GarcÃa-Hierro | 6b99219 | 2005-06-25 14:54:34 -0700 | [diff] [blame] | 3130 | if (rc) |
| 3131 | return rc; |
| 3132 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3133 | #endif |
| 3134 | |
| 3135 | return file_map_prot_check(vma->vm_file, prot, vma->vm_flags&VM_SHARED); |
| 3136 | } |
| 3137 | |
| 3138 | static int selinux_file_lock(struct file *file, unsigned int cmd) |
| 3139 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3140 | const struct cred *cred = current_cred(); |
| 3141 | |
| 3142 | return file_has_perm(cred, file, FILE__LOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3143 | } |
| 3144 | |
| 3145 | static int selinux_file_fcntl(struct file *file, unsigned int cmd, |
| 3146 | unsigned long arg) |
| 3147 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3148 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3149 | int err = 0; |
| 3150 | |
| 3151 | switch (cmd) { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3152 | case F_SETFL: |
| 3153 | if (!file->f_path.dentry || !file->f_path.dentry->d_inode) { |
| 3154 | err = -EINVAL; |
| 3155 | break; |
| 3156 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3157 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3158 | if ((file->f_flags & O_APPEND) && !(arg & O_APPEND)) { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3159 | err = file_has_perm(cred, file, FILE__WRITE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3160 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3161 | } |
| 3162 | /* fall through */ |
| 3163 | case F_SETOWN: |
| 3164 | case F_SETSIG: |
| 3165 | case F_GETFL: |
| 3166 | case F_GETOWN: |
| 3167 | case F_GETSIG: |
| 3168 | /* Just check FD__USE permission */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3169 | err = file_has_perm(cred, file, 0); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3170 | break; |
| 3171 | case F_GETLK: |
| 3172 | case F_SETLK: |
| 3173 | case F_SETLKW: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3174 | #if BITS_PER_LONG == 32 |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3175 | case F_GETLK64: |
| 3176 | case F_SETLK64: |
| 3177 | case F_SETLKW64: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3178 | #endif |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3179 | if (!file->f_path.dentry || !file->f_path.dentry->d_inode) { |
| 3180 | err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3181 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3182 | } |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3183 | err = file_has_perm(cred, file, FILE__LOCK); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3184 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3185 | } |
| 3186 | |
| 3187 | return err; |
| 3188 | } |
| 3189 | |
| 3190 | static int selinux_file_set_fowner(struct file *file) |
| 3191 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3192 | struct file_security_struct *fsec; |
| 3193 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3194 | fsec = file->f_security; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3195 | fsec->fown_sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3196 | |
| 3197 | return 0; |
| 3198 | } |
| 3199 | |
| 3200 | static int selinux_file_send_sigiotask(struct task_struct *tsk, |
| 3201 | struct fown_struct *fown, int signum) |
| 3202 | { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3203 | struct file *file; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3204 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3205 | u32 perm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3206 | struct file_security_struct *fsec; |
| 3207 | |
| 3208 | /* struct fown_struct is never outside the context of a struct file */ |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3209 | file = container_of(fown, struct file, f_owner); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3210 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3211 | fsec = file->f_security; |
| 3212 | |
| 3213 | if (!signum) |
| 3214 | perm = signal_to_av(SIGIO); /* as per send_sigio_to_task */ |
| 3215 | else |
| 3216 | perm = signal_to_av(signum); |
| 3217 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3218 | return avc_has_perm(fsec->fown_sid, sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3219 | SECCLASS_PROCESS, perm, NULL); |
| 3220 | } |
| 3221 | |
| 3222 | static int selinux_file_receive(struct file *file) |
| 3223 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3224 | const struct cred *cred = current_cred(); |
| 3225 | |
| 3226 | return file_has_perm(cred, file, file_to_av(file)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3227 | } |
| 3228 | |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 3229 | static int selinux_dentry_open(struct file *file, const struct cred *cred) |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 3230 | { |
| 3231 | struct file_security_struct *fsec; |
| 3232 | struct inode *inode; |
| 3233 | struct inode_security_struct *isec; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 3234 | |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 3235 | inode = file->f_path.dentry->d_inode; |
| 3236 | fsec = file->f_security; |
| 3237 | isec = inode->i_security; |
| 3238 | /* |
| 3239 | * Save inode label and policy sequence number |
| 3240 | * at open-time so that selinux_file_permission |
| 3241 | * can determine whether revalidation is necessary. |
| 3242 | * Task label is already saved in the file security |
| 3243 | * struct as its SID. |
| 3244 | */ |
| 3245 | fsec->isid = isec->sid; |
| 3246 | fsec->pseqno = avc_policy_seqno(); |
| 3247 | /* |
| 3248 | * Since the inode label or policy seqno may have changed |
| 3249 | * between the selinux_inode_permission check and the saving |
| 3250 | * of state above, recheck that access is still permitted. |
| 3251 | * Otherwise, access might never be revalidated against the |
| 3252 | * new inode label or new policy. |
| 3253 | * This check is not redundant - do not remove. |
| 3254 | */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3255 | return inode_has_perm(cred, inode, open_file_to_av(file), NULL); |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 3256 | } |
| 3257 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3258 | /* task security operations */ |
| 3259 | |
| 3260 | static int selinux_task_create(unsigned long clone_flags) |
| 3261 | { |
| 3262 | int rc; |
| 3263 | |
| 3264 | rc = secondary_ops->task_create(clone_flags); |
| 3265 | if (rc) |
| 3266 | return rc; |
| 3267 | |
| 3268 | return task_has_perm(current, current, PROCESS__FORK); |
| 3269 | } |
| 3270 | |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 3271 | /* |
| 3272 | * detach and free the LSM part of a set of credentials |
| 3273 | */ |
| 3274 | static void selinux_cred_free(struct cred *cred) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3275 | { |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 3276 | struct task_security_struct *tsec = cred->security; |
| 3277 | cred->security = NULL; |
| 3278 | kfree(tsec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3279 | } |
| 3280 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 3281 | /* |
| 3282 | * prepare a new set of credentials for modification |
| 3283 | */ |
| 3284 | static int selinux_cred_prepare(struct cred *new, const struct cred *old, |
| 3285 | gfp_t gfp) |
| 3286 | { |
| 3287 | const struct task_security_struct *old_tsec; |
| 3288 | struct task_security_struct *tsec; |
| 3289 | |
| 3290 | old_tsec = old->security; |
| 3291 | |
| 3292 | tsec = kmemdup(old_tsec, sizeof(struct task_security_struct), gfp); |
| 3293 | if (!tsec) |
| 3294 | return -ENOMEM; |
| 3295 | |
| 3296 | new->security = tsec; |
| 3297 | return 0; |
| 3298 | } |
| 3299 | |
| 3300 | /* |
| 3301 | * commit new credentials |
| 3302 | */ |
| 3303 | static void selinux_cred_commit(struct cred *new, const struct cred *old) |
| 3304 | { |
| 3305 | secondary_ops->cred_commit(new, old); |
| 3306 | } |
| 3307 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3308 | static int selinux_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags) |
| 3309 | { |
| 3310 | /* Since setuid only affects the current process, and |
| 3311 | since the SELinux controls are not based on the Linux |
| 3312 | identity attributes, SELinux does not need to control |
| 3313 | this operation. However, SELinux does control the use |
| 3314 | of the CAP_SETUID and CAP_SETGID capabilities using the |
| 3315 | capable hook. */ |
| 3316 | return 0; |
| 3317 | } |
| 3318 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 3319 | static int selinux_task_fix_setuid(struct cred *new, const struct cred *old, |
| 3320 | int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3321 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 3322 | return secondary_ops->task_fix_setuid(new, old, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3323 | } |
| 3324 | |
| 3325 | static int selinux_task_setgid(gid_t id0, gid_t id1, gid_t id2, int flags) |
| 3326 | { |
| 3327 | /* See the comment for setuid above. */ |
| 3328 | return 0; |
| 3329 | } |
| 3330 | |
| 3331 | static int selinux_task_setpgid(struct task_struct *p, pid_t pgid) |
| 3332 | { |
| 3333 | return task_has_perm(current, p, PROCESS__SETPGID); |
| 3334 | } |
| 3335 | |
| 3336 | static int selinux_task_getpgid(struct task_struct *p) |
| 3337 | { |
| 3338 | return task_has_perm(current, p, PROCESS__GETPGID); |
| 3339 | } |
| 3340 | |
| 3341 | static int selinux_task_getsid(struct task_struct *p) |
| 3342 | { |
| 3343 | return task_has_perm(current, p, PROCESS__GETSESSION); |
| 3344 | } |
| 3345 | |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3346 | static void selinux_task_getsecid(struct task_struct *p, u32 *secid) |
| 3347 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3348 | *secid = task_sid(p); |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3349 | } |
| 3350 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3351 | static int selinux_task_setgroups(struct group_info *group_info) |
| 3352 | { |
| 3353 | /* See the comment for setuid above. */ |
| 3354 | return 0; |
| 3355 | } |
| 3356 | |
| 3357 | static int selinux_task_setnice(struct task_struct *p, int nice) |
| 3358 | { |
| 3359 | int rc; |
| 3360 | |
| 3361 | rc = secondary_ops->task_setnice(p, nice); |
| 3362 | if (rc) |
| 3363 | return rc; |
| 3364 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3365 | return task_has_perm(current, p, PROCESS__SETSCHED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3366 | } |
| 3367 | |
James Morris | 03e6806 | 2006-06-23 02:03:58 -0700 | [diff] [blame] | 3368 | static int selinux_task_setioprio(struct task_struct *p, int ioprio) |
| 3369 | { |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 3370 | int rc; |
| 3371 | |
| 3372 | rc = secondary_ops->task_setioprio(p, ioprio); |
| 3373 | if (rc) |
| 3374 | return rc; |
| 3375 | |
James Morris | 03e6806 | 2006-06-23 02:03:58 -0700 | [diff] [blame] | 3376 | return task_has_perm(current, p, PROCESS__SETSCHED); |
| 3377 | } |
| 3378 | |
David Quigley | a1836a4 | 2006-06-30 01:55:49 -0700 | [diff] [blame] | 3379 | static int selinux_task_getioprio(struct task_struct *p) |
| 3380 | { |
| 3381 | return task_has_perm(current, p, PROCESS__GETSCHED); |
| 3382 | } |
| 3383 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3384 | static int selinux_task_setrlimit(unsigned int resource, struct rlimit *new_rlim) |
| 3385 | { |
| 3386 | struct rlimit *old_rlim = current->signal->rlim + resource; |
| 3387 | int rc; |
| 3388 | |
| 3389 | rc = secondary_ops->task_setrlimit(resource, new_rlim); |
| 3390 | if (rc) |
| 3391 | return rc; |
| 3392 | |
| 3393 | /* Control the ability to change the hard limit (whether |
| 3394 | lowering or raising it), so that the hard limit can |
| 3395 | later be used as a safe reset point for the soft limit |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 3396 | upon context transitions. See selinux_bprm_committing_creds. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3397 | if (old_rlim->rlim_max != new_rlim->rlim_max) |
| 3398 | return task_has_perm(current, current, PROCESS__SETRLIMIT); |
| 3399 | |
| 3400 | return 0; |
| 3401 | } |
| 3402 | |
| 3403 | static int selinux_task_setscheduler(struct task_struct *p, int policy, struct sched_param *lp) |
| 3404 | { |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 3405 | int rc; |
| 3406 | |
| 3407 | rc = secondary_ops->task_setscheduler(p, policy, lp); |
| 3408 | if (rc) |
| 3409 | return rc; |
| 3410 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3411 | return task_has_perm(current, p, PROCESS__SETSCHED); |
| 3412 | } |
| 3413 | |
| 3414 | static int selinux_task_getscheduler(struct task_struct *p) |
| 3415 | { |
| 3416 | return task_has_perm(current, p, PROCESS__GETSCHED); |
| 3417 | } |
| 3418 | |
David Quigley | 3560154 | 2006-06-23 02:04:01 -0700 | [diff] [blame] | 3419 | static int selinux_task_movememory(struct task_struct *p) |
| 3420 | { |
| 3421 | return task_has_perm(current, p, PROCESS__SETSCHED); |
| 3422 | } |
| 3423 | |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3424 | static int selinux_task_kill(struct task_struct *p, struct siginfo *info, |
| 3425 | int sig, u32 secid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3426 | { |
| 3427 | u32 perm; |
| 3428 | int rc; |
| 3429 | |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3430 | rc = secondary_ops->task_kill(p, info, sig, secid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3431 | if (rc) |
| 3432 | return rc; |
| 3433 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3434 | if (!sig) |
| 3435 | perm = PROCESS__SIGNULL; /* null signal; existence test */ |
| 3436 | else |
| 3437 | perm = signal_to_av(sig); |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3438 | if (secid) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3439 | rc = avc_has_perm(secid, task_sid(p), |
| 3440 | SECCLASS_PROCESS, perm, NULL); |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3441 | else |
| 3442 | rc = task_has_perm(current, p, perm); |
| 3443 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3444 | } |
| 3445 | |
| 3446 | static int selinux_task_prctl(int option, |
| 3447 | unsigned long arg2, |
| 3448 | unsigned long arg3, |
| 3449 | unsigned long arg4, |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 3450 | unsigned long arg5) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3451 | { |
| 3452 | /* The current prctl operations do not appear to require |
| 3453 | any SELinux controls since they merely observe or modify |
| 3454 | the state of the current process. */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 3455 | return secondary_ops->task_prctl(option, arg2, arg3, arg4, arg5); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3456 | } |
| 3457 | |
| 3458 | static int selinux_task_wait(struct task_struct *p) |
| 3459 | { |
Eric Paris | 8a53514 | 2007-10-22 16:10:31 -0400 | [diff] [blame] | 3460 | return task_has_perm(p, current, PROCESS__SIGCHLD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3461 | } |
| 3462 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3463 | static void selinux_task_to_inode(struct task_struct *p, |
| 3464 | struct inode *inode) |
| 3465 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3466 | struct inode_security_struct *isec = inode->i_security; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3467 | u32 sid = task_sid(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3468 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3469 | isec->sid = sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3470 | isec->initialized = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3471 | } |
| 3472 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3473 | /* Returns error only if unable to parse addresses */ |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3474 | static int selinux_parse_skb_ipv4(struct sk_buff *skb, |
| 3475 | struct avc_audit_data *ad, u8 *proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3476 | { |
| 3477 | int offset, ihlen, ret = -EINVAL; |
| 3478 | struct iphdr _iph, *ih; |
| 3479 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 3480 | offset = skb_network_offset(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3481 | ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph); |
| 3482 | if (ih == NULL) |
| 3483 | goto out; |
| 3484 | |
| 3485 | ihlen = ih->ihl * 4; |
| 3486 | if (ihlen < sizeof(_iph)) |
| 3487 | goto out; |
| 3488 | |
| 3489 | ad->u.net.v4info.saddr = ih->saddr; |
| 3490 | ad->u.net.v4info.daddr = ih->daddr; |
| 3491 | ret = 0; |
| 3492 | |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3493 | if (proto) |
| 3494 | *proto = ih->protocol; |
| 3495 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3496 | switch (ih->protocol) { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3497 | case IPPROTO_TCP: { |
| 3498 | struct tcphdr _tcph, *th; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3499 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3500 | if (ntohs(ih->frag_off) & IP_OFFSET) |
| 3501 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3502 | |
| 3503 | offset += ihlen; |
| 3504 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); |
| 3505 | if (th == NULL) |
| 3506 | break; |
| 3507 | |
| 3508 | ad->u.net.sport = th->source; |
| 3509 | ad->u.net.dport = th->dest; |
| 3510 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3511 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3512 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3513 | case IPPROTO_UDP: { |
| 3514 | struct udphdr _udph, *uh; |
| 3515 | |
| 3516 | if (ntohs(ih->frag_off) & IP_OFFSET) |
| 3517 | break; |
| 3518 | |
| 3519 | offset += ihlen; |
| 3520 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); |
| 3521 | if (uh == NULL) |
| 3522 | break; |
| 3523 | |
| 3524 | ad->u.net.sport = uh->source; |
| 3525 | ad->u.net.dport = uh->dest; |
| 3526 | break; |
| 3527 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3528 | |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3529 | case IPPROTO_DCCP: { |
| 3530 | struct dccp_hdr _dccph, *dh; |
| 3531 | |
| 3532 | if (ntohs(ih->frag_off) & IP_OFFSET) |
| 3533 | break; |
| 3534 | |
| 3535 | offset += ihlen; |
| 3536 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); |
| 3537 | if (dh == NULL) |
| 3538 | break; |
| 3539 | |
| 3540 | ad->u.net.sport = dh->dccph_sport; |
| 3541 | ad->u.net.dport = dh->dccph_dport; |
| 3542 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3543 | } |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3544 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3545 | default: |
| 3546 | break; |
| 3547 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3548 | out: |
| 3549 | return ret; |
| 3550 | } |
| 3551 | |
| 3552 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 3553 | |
| 3554 | /* Returns error only if unable to parse addresses */ |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3555 | static int selinux_parse_skb_ipv6(struct sk_buff *skb, |
| 3556 | struct avc_audit_data *ad, u8 *proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3557 | { |
| 3558 | u8 nexthdr; |
| 3559 | int ret = -EINVAL, offset; |
| 3560 | struct ipv6hdr _ipv6h, *ip6; |
| 3561 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 3562 | offset = skb_network_offset(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3563 | ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h); |
| 3564 | if (ip6 == NULL) |
| 3565 | goto out; |
| 3566 | |
| 3567 | ipv6_addr_copy(&ad->u.net.v6info.saddr, &ip6->saddr); |
| 3568 | ipv6_addr_copy(&ad->u.net.v6info.daddr, &ip6->daddr); |
| 3569 | ret = 0; |
| 3570 | |
| 3571 | nexthdr = ip6->nexthdr; |
| 3572 | offset += sizeof(_ipv6h); |
Herbert Xu | 0d3d077 | 2005-04-24 20:16:19 -0700 | [diff] [blame] | 3573 | offset = ipv6_skip_exthdr(skb, offset, &nexthdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3574 | if (offset < 0) |
| 3575 | goto out; |
| 3576 | |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3577 | if (proto) |
| 3578 | *proto = nexthdr; |
| 3579 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3580 | switch (nexthdr) { |
| 3581 | case IPPROTO_TCP: { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3582 | struct tcphdr _tcph, *th; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3583 | |
| 3584 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); |
| 3585 | if (th == NULL) |
| 3586 | break; |
| 3587 | |
| 3588 | ad->u.net.sport = th->source; |
| 3589 | ad->u.net.dport = th->dest; |
| 3590 | break; |
| 3591 | } |
| 3592 | |
| 3593 | case IPPROTO_UDP: { |
| 3594 | struct udphdr _udph, *uh; |
| 3595 | |
| 3596 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); |
| 3597 | if (uh == NULL) |
| 3598 | break; |
| 3599 | |
| 3600 | ad->u.net.sport = uh->source; |
| 3601 | ad->u.net.dport = uh->dest; |
| 3602 | break; |
| 3603 | } |
| 3604 | |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3605 | case IPPROTO_DCCP: { |
| 3606 | struct dccp_hdr _dccph, *dh; |
| 3607 | |
| 3608 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); |
| 3609 | if (dh == NULL) |
| 3610 | break; |
| 3611 | |
| 3612 | ad->u.net.sport = dh->dccph_sport; |
| 3613 | ad->u.net.dport = dh->dccph_dport; |
| 3614 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3615 | } |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3616 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3617 | /* includes fragments */ |
| 3618 | default: |
| 3619 | break; |
| 3620 | } |
| 3621 | out: |
| 3622 | return ret; |
| 3623 | } |
| 3624 | |
| 3625 | #endif /* IPV6 */ |
| 3626 | |
| 3627 | static int selinux_parse_skb(struct sk_buff *skb, struct avc_audit_data *ad, |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 3628 | char **_addrp, int src, u8 *proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3629 | { |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 3630 | char *addrp; |
| 3631 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3632 | |
| 3633 | switch (ad->u.net.family) { |
| 3634 | case PF_INET: |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3635 | ret = selinux_parse_skb_ipv4(skb, ad, proto); |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 3636 | if (ret) |
| 3637 | goto parse_error; |
| 3638 | addrp = (char *)(src ? &ad->u.net.v4info.saddr : |
| 3639 | &ad->u.net.v4info.daddr); |
| 3640 | goto okay; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3641 | |
| 3642 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 3643 | case PF_INET6: |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3644 | ret = selinux_parse_skb_ipv6(skb, ad, proto); |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 3645 | if (ret) |
| 3646 | goto parse_error; |
| 3647 | addrp = (char *)(src ? &ad->u.net.v6info.saddr : |
| 3648 | &ad->u.net.v6info.daddr); |
| 3649 | goto okay; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3650 | #endif /* IPV6 */ |
| 3651 | default: |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 3652 | addrp = NULL; |
| 3653 | goto okay; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3654 | } |
| 3655 | |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 3656 | parse_error: |
| 3657 | printk(KERN_WARNING |
| 3658 | "SELinux: failure in selinux_parse_skb()," |
| 3659 | " unable to parse packet\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3660 | return ret; |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 3661 | |
| 3662 | okay: |
| 3663 | if (_addrp) |
| 3664 | *_addrp = addrp; |
| 3665 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3666 | } |
| 3667 | |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3668 | /** |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3669 | * selinux_skb_peerlbl_sid - Determine the peer label of a packet |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3670 | * @skb: the packet |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 3671 | * @family: protocol family |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3672 | * @sid: the packet's peer label SID |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3673 | * |
| 3674 | * Description: |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3675 | * Check the various different forms of network peer labeling and determine |
| 3676 | * the peer label/SID for the packet; most of the magic actually occurs in |
| 3677 | * the security server function security_net_peersid_cmp(). The function |
| 3678 | * returns zero if the value in @sid is valid (although it may be SECSID_NULL) |
| 3679 | * or -EACCES if @sid is invalid due to inconsistencies with the different |
| 3680 | * peer labels. |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3681 | * |
| 3682 | */ |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3683 | static int selinux_skb_peerlbl_sid(struct sk_buff *skb, u16 family, u32 *sid) |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3684 | { |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 3685 | int err; |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3686 | u32 xfrm_sid; |
| 3687 | u32 nlbl_sid; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3688 | u32 nlbl_type; |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3689 | |
| 3690 | selinux_skb_xfrm_sid(skb, &xfrm_sid); |
Paul Moore | 5dbe1eb | 2008-01-29 08:44:18 -0500 | [diff] [blame] | 3691 | selinux_netlbl_skbuff_getsid(skb, family, &nlbl_type, &nlbl_sid); |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3692 | |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 3693 | err = security_net_peersid_resolve(nlbl_sid, nlbl_type, xfrm_sid, sid); |
| 3694 | if (unlikely(err)) { |
| 3695 | printk(KERN_WARNING |
| 3696 | "SELinux: failure in selinux_skb_peerlbl_sid()," |
| 3697 | " unable to determine packet's peer label\n"); |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3698 | return -EACCES; |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 3699 | } |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3700 | |
| 3701 | return 0; |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3702 | } |
| 3703 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3704 | /* socket security operations */ |
| 3705 | static int socket_has_perm(struct task_struct *task, struct socket *sock, |
| 3706 | u32 perms) |
| 3707 | { |
| 3708 | struct inode_security_struct *isec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3709 | struct avc_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3710 | u32 sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3711 | int err = 0; |
| 3712 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3713 | isec = SOCK_INODE(sock)->i_security; |
| 3714 | |
| 3715 | if (isec->sid == SECINITSID_KERNEL) |
| 3716 | goto out; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3717 | sid = task_sid(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3718 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3719 | AVC_AUDIT_DATA_INIT(&ad, NET); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3720 | ad.u.net.sk = sock->sk; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3721 | err = avc_has_perm(sid, isec->sid, isec->sclass, perms, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3722 | |
| 3723 | out: |
| 3724 | return err; |
| 3725 | } |
| 3726 | |
| 3727 | static int selinux_socket_create(int family, int type, |
| 3728 | int protocol, int kern) |
| 3729 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3730 | const struct cred *cred = current_cred(); |
| 3731 | const struct task_security_struct *tsec = cred->security; |
| 3732 | u32 sid, newsid; |
| 3733 | u16 secclass; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3734 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3735 | |
| 3736 | if (kern) |
| 3737 | goto out; |
| 3738 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3739 | sid = tsec->sid; |
| 3740 | newsid = tsec->sockcreate_sid ?: sid; |
| 3741 | |
| 3742 | secclass = socket_type_to_security_class(family, type, protocol); |
| 3743 | err = avc_has_perm(sid, newsid, secclass, SOCKET__CREATE, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3744 | |
| 3745 | out: |
| 3746 | return err; |
| 3747 | } |
| 3748 | |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 3749 | static int selinux_socket_post_create(struct socket *sock, int family, |
| 3750 | int type, int protocol, int kern) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3751 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3752 | const struct cred *cred = current_cred(); |
| 3753 | const struct task_security_struct *tsec = cred->security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3754 | struct inode_security_struct *isec; |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 3755 | struct sk_security_struct *sksec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3756 | u32 sid, newsid; |
| 3757 | int err = 0; |
| 3758 | |
| 3759 | sid = tsec->sid; |
| 3760 | newsid = tsec->sockcreate_sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3761 | |
| 3762 | isec = SOCK_INODE(sock)->i_security; |
| 3763 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3764 | if (kern) |
| 3765 | isec->sid = SECINITSID_KERNEL; |
| 3766 | else if (newsid) |
| 3767 | isec->sid = newsid; |
| 3768 | else |
| 3769 | isec->sid = sid; |
| 3770 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3771 | isec->sclass = socket_type_to_security_class(family, type, protocol); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3772 | isec->initialized = 1; |
| 3773 | |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 3774 | if (sock->sk) { |
| 3775 | sksec = sock->sk->sk_security; |
| 3776 | sksec->sid = isec->sid; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3777 | sksec->sclass = isec->sclass; |
Paul Moore | 9f2ad66 | 2006-11-17 17:38:53 -0500 | [diff] [blame] | 3778 | err = selinux_netlbl_socket_post_create(sock); |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 3779 | } |
| 3780 | |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 3781 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3782 | } |
| 3783 | |
| 3784 | /* Range of port numbers used to automatically bind. |
| 3785 | Need to determine whether we should perform a name_bind |
| 3786 | permission check between the socket and the port number. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3787 | |
| 3788 | static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen) |
| 3789 | { |
| 3790 | u16 family; |
| 3791 | int err; |
| 3792 | |
| 3793 | err = socket_has_perm(current, sock, SOCKET__BIND); |
| 3794 | if (err) |
| 3795 | goto out; |
| 3796 | |
| 3797 | /* |
| 3798 | * If PF_INET or PF_INET6, check name_bind permission for the port. |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 3799 | * Multiple address binding for SCTP is not supported yet: we just |
| 3800 | * check the first address now. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3801 | */ |
| 3802 | family = sock->sk->sk_family; |
| 3803 | if (family == PF_INET || family == PF_INET6) { |
| 3804 | char *addrp; |
| 3805 | struct inode_security_struct *isec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3806 | struct avc_audit_data ad; |
| 3807 | struct sockaddr_in *addr4 = NULL; |
| 3808 | struct sockaddr_in6 *addr6 = NULL; |
| 3809 | unsigned short snum; |
| 3810 | struct sock *sk = sock->sk; |
James Morris | e399f98 | 2008-06-12 01:39:58 +1000 | [diff] [blame] | 3811 | u32 sid, node_perm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3812 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3813 | isec = SOCK_INODE(sock)->i_security; |
| 3814 | |
| 3815 | if (family == PF_INET) { |
| 3816 | addr4 = (struct sockaddr_in *)address; |
| 3817 | snum = ntohs(addr4->sin_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3818 | addrp = (char *)&addr4->sin_addr.s_addr; |
| 3819 | } else { |
| 3820 | addr6 = (struct sockaddr_in6 *)address; |
| 3821 | snum = ntohs(addr6->sin6_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3822 | addrp = (char *)&addr6->sin6_addr.s6_addr; |
| 3823 | } |
| 3824 | |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 3825 | if (snum) { |
| 3826 | int low, high; |
| 3827 | |
| 3828 | inet_get_local_port_range(&low, &high); |
| 3829 | |
| 3830 | if (snum < max(PROT_SOCK, low) || snum > high) { |
Paul Moore | 3e11217 | 2008-04-10 10:48:14 -0400 | [diff] [blame] | 3831 | err = sel_netport_sid(sk->sk_protocol, |
| 3832 | snum, &sid); |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 3833 | if (err) |
| 3834 | goto out; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3835 | AVC_AUDIT_DATA_INIT(&ad, NET); |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 3836 | ad.u.net.sport = htons(snum); |
| 3837 | ad.u.net.family = family; |
| 3838 | err = avc_has_perm(isec->sid, sid, |
| 3839 | isec->sclass, |
| 3840 | SOCKET__NAME_BIND, &ad); |
| 3841 | if (err) |
| 3842 | goto out; |
| 3843 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3844 | } |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3845 | |
| 3846 | switch (isec->sclass) { |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 3847 | case SECCLASS_TCP_SOCKET: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3848 | node_perm = TCP_SOCKET__NODE_BIND; |
| 3849 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3850 | |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 3851 | case SECCLASS_UDP_SOCKET: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3852 | node_perm = UDP_SOCKET__NODE_BIND; |
| 3853 | break; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3854 | |
| 3855 | case SECCLASS_DCCP_SOCKET: |
| 3856 | node_perm = DCCP_SOCKET__NODE_BIND; |
| 3857 | break; |
| 3858 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3859 | default: |
| 3860 | node_perm = RAWIP_SOCKET__NODE_BIND; |
| 3861 | break; |
| 3862 | } |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3863 | |
Paul Moore | 224dfbd | 2008-01-29 08:38:13 -0500 | [diff] [blame] | 3864 | err = sel_netnode_sid(addrp, family, &sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3865 | if (err) |
| 3866 | goto out; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3867 | |
| 3868 | AVC_AUDIT_DATA_INIT(&ad, NET); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3869 | ad.u.net.sport = htons(snum); |
| 3870 | ad.u.net.family = family; |
| 3871 | |
| 3872 | if (family == PF_INET) |
| 3873 | ad.u.net.v4info.saddr = addr4->sin_addr.s_addr; |
| 3874 | else |
| 3875 | ipv6_addr_copy(&ad.u.net.v6info.saddr, &addr6->sin6_addr); |
| 3876 | |
| 3877 | err = avc_has_perm(isec->sid, sid, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3878 | isec->sclass, node_perm, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3879 | if (err) |
| 3880 | goto out; |
| 3881 | } |
| 3882 | out: |
| 3883 | return err; |
| 3884 | } |
| 3885 | |
| 3886 | static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen) |
| 3887 | { |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 3888 | struct sock *sk = sock->sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3889 | struct inode_security_struct *isec; |
| 3890 | int err; |
| 3891 | |
| 3892 | err = socket_has_perm(current, sock, SOCKET__CONNECT); |
| 3893 | if (err) |
| 3894 | return err; |
| 3895 | |
| 3896 | /* |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3897 | * If a TCP or DCCP socket, check name_connect permission for the port. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3898 | */ |
| 3899 | isec = SOCK_INODE(sock)->i_security; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3900 | if (isec->sclass == SECCLASS_TCP_SOCKET || |
| 3901 | isec->sclass == SECCLASS_DCCP_SOCKET) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3902 | struct avc_audit_data ad; |
| 3903 | struct sockaddr_in *addr4 = NULL; |
| 3904 | struct sockaddr_in6 *addr6 = NULL; |
| 3905 | unsigned short snum; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3906 | u32 sid, perm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3907 | |
| 3908 | if (sk->sk_family == PF_INET) { |
| 3909 | addr4 = (struct sockaddr_in *)address; |
Stephen Smalley | 911656f | 2005-07-28 21:16:21 -0700 | [diff] [blame] | 3910 | if (addrlen < sizeof(struct sockaddr_in)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3911 | return -EINVAL; |
| 3912 | snum = ntohs(addr4->sin_port); |
| 3913 | } else { |
| 3914 | addr6 = (struct sockaddr_in6 *)address; |
Stephen Smalley | 911656f | 2005-07-28 21:16:21 -0700 | [diff] [blame] | 3915 | if (addrlen < SIN6_LEN_RFC2133) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3916 | return -EINVAL; |
| 3917 | snum = ntohs(addr6->sin6_port); |
| 3918 | } |
| 3919 | |
Paul Moore | 3e11217 | 2008-04-10 10:48:14 -0400 | [diff] [blame] | 3920 | err = sel_netport_sid(sk->sk_protocol, snum, &sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3921 | if (err) |
| 3922 | goto out; |
| 3923 | |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3924 | perm = (isec->sclass == SECCLASS_TCP_SOCKET) ? |
| 3925 | TCP_SOCKET__NAME_CONNECT : DCCP_SOCKET__NAME_CONNECT; |
| 3926 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3927 | AVC_AUDIT_DATA_INIT(&ad, NET); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3928 | ad.u.net.dport = htons(snum); |
| 3929 | ad.u.net.family = sk->sk_family; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3930 | err = avc_has_perm(isec->sid, sid, isec->sclass, perm, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3931 | if (err) |
| 3932 | goto out; |
| 3933 | } |
| 3934 | |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 3935 | err = selinux_netlbl_socket_connect(sk, address); |
| 3936 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3937 | out: |
| 3938 | return err; |
| 3939 | } |
| 3940 | |
| 3941 | static int selinux_socket_listen(struct socket *sock, int backlog) |
| 3942 | { |
| 3943 | return socket_has_perm(current, sock, SOCKET__LISTEN); |
| 3944 | } |
| 3945 | |
| 3946 | static int selinux_socket_accept(struct socket *sock, struct socket *newsock) |
| 3947 | { |
| 3948 | int err; |
| 3949 | struct inode_security_struct *isec; |
| 3950 | struct inode_security_struct *newisec; |
| 3951 | |
| 3952 | err = socket_has_perm(current, sock, SOCKET__ACCEPT); |
| 3953 | if (err) |
| 3954 | return err; |
| 3955 | |
| 3956 | newisec = SOCK_INODE(newsock)->i_security; |
| 3957 | |
| 3958 | isec = SOCK_INODE(sock)->i_security; |
| 3959 | newisec->sclass = isec->sclass; |
| 3960 | newisec->sid = isec->sid; |
| 3961 | newisec->initialized = 1; |
| 3962 | |
| 3963 | return 0; |
| 3964 | } |
| 3965 | |
| 3966 | static int selinux_socket_sendmsg(struct socket *sock, struct msghdr *msg, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3967 | int size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3968 | { |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 3969 | int rc; |
| 3970 | |
| 3971 | rc = socket_has_perm(current, sock, SOCKET__WRITE); |
| 3972 | if (rc) |
| 3973 | return rc; |
| 3974 | |
| 3975 | return selinux_netlbl_inode_permission(SOCK_INODE(sock), MAY_WRITE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3976 | } |
| 3977 | |
| 3978 | static int selinux_socket_recvmsg(struct socket *sock, struct msghdr *msg, |
| 3979 | int size, int flags) |
| 3980 | { |
| 3981 | return socket_has_perm(current, sock, SOCKET__READ); |
| 3982 | } |
| 3983 | |
| 3984 | static int selinux_socket_getsockname(struct socket *sock) |
| 3985 | { |
| 3986 | return socket_has_perm(current, sock, SOCKET__GETATTR); |
| 3987 | } |
| 3988 | |
| 3989 | static int selinux_socket_getpeername(struct socket *sock) |
| 3990 | { |
| 3991 | return socket_has_perm(current, sock, SOCKET__GETATTR); |
| 3992 | } |
| 3993 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3994 | static int selinux_socket_setsockopt(struct socket *sock, int level, int optname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3995 | { |
Paul Moore | f8687af | 2006-10-30 15:22:15 -0800 | [diff] [blame] | 3996 | int err; |
| 3997 | |
| 3998 | err = socket_has_perm(current, sock, SOCKET__SETOPT); |
| 3999 | if (err) |
| 4000 | return err; |
| 4001 | |
| 4002 | return selinux_netlbl_socket_setsockopt(sock, level, optname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4003 | } |
| 4004 | |
| 4005 | static int selinux_socket_getsockopt(struct socket *sock, int level, |
| 4006 | int optname) |
| 4007 | { |
| 4008 | return socket_has_perm(current, sock, SOCKET__GETOPT); |
| 4009 | } |
| 4010 | |
| 4011 | static int selinux_socket_shutdown(struct socket *sock, int how) |
| 4012 | { |
| 4013 | return socket_has_perm(current, sock, SOCKET__SHUTDOWN); |
| 4014 | } |
| 4015 | |
| 4016 | static int selinux_socket_unix_stream_connect(struct socket *sock, |
| 4017 | struct socket *other, |
| 4018 | struct sock *newsk) |
| 4019 | { |
| 4020 | struct sk_security_struct *ssec; |
| 4021 | struct inode_security_struct *isec; |
| 4022 | struct inode_security_struct *other_isec; |
| 4023 | struct avc_audit_data ad; |
| 4024 | int err; |
| 4025 | |
| 4026 | err = secondary_ops->unix_stream_connect(sock, other, newsk); |
| 4027 | if (err) |
| 4028 | return err; |
| 4029 | |
| 4030 | isec = SOCK_INODE(sock)->i_security; |
| 4031 | other_isec = SOCK_INODE(other)->i_security; |
| 4032 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4033 | AVC_AUDIT_DATA_INIT(&ad, NET); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4034 | ad.u.net.sk = other->sk; |
| 4035 | |
| 4036 | err = avc_has_perm(isec->sid, other_isec->sid, |
| 4037 | isec->sclass, |
| 4038 | UNIX_STREAM_SOCKET__CONNECTTO, &ad); |
| 4039 | if (err) |
| 4040 | return err; |
| 4041 | |
| 4042 | /* connecting socket */ |
| 4043 | ssec = sock->sk->sk_security; |
| 4044 | ssec->peer_sid = other_isec->sid; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4045 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4046 | /* server child socket */ |
| 4047 | ssec = newsk->sk_security; |
| 4048 | ssec->peer_sid = isec->sid; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4049 | err = security_sid_mls_copy(other_isec->sid, ssec->peer_sid, &ssec->sid); |
| 4050 | |
| 4051 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4052 | } |
| 4053 | |
| 4054 | static int selinux_socket_unix_may_send(struct socket *sock, |
| 4055 | struct socket *other) |
| 4056 | { |
| 4057 | struct inode_security_struct *isec; |
| 4058 | struct inode_security_struct *other_isec; |
| 4059 | struct avc_audit_data ad; |
| 4060 | int err; |
| 4061 | |
| 4062 | isec = SOCK_INODE(sock)->i_security; |
| 4063 | other_isec = SOCK_INODE(other)->i_security; |
| 4064 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4065 | AVC_AUDIT_DATA_INIT(&ad, NET); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4066 | ad.u.net.sk = other->sk; |
| 4067 | |
| 4068 | err = avc_has_perm(isec->sid, other_isec->sid, |
| 4069 | isec->sclass, SOCKET__SENDTO, &ad); |
| 4070 | if (err) |
| 4071 | return err; |
| 4072 | |
| 4073 | return 0; |
| 4074 | } |
| 4075 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4076 | static int selinux_inet_sys_rcv_skb(int ifindex, char *addrp, u16 family, |
| 4077 | u32 peer_sid, |
| 4078 | struct avc_audit_data *ad) |
| 4079 | { |
| 4080 | int err; |
| 4081 | u32 if_sid; |
| 4082 | u32 node_sid; |
| 4083 | |
| 4084 | err = sel_netif_sid(ifindex, &if_sid); |
| 4085 | if (err) |
| 4086 | return err; |
| 4087 | err = avc_has_perm(peer_sid, if_sid, |
| 4088 | SECCLASS_NETIF, NETIF__INGRESS, ad); |
| 4089 | if (err) |
| 4090 | return err; |
| 4091 | |
| 4092 | err = sel_netnode_sid(addrp, family, &node_sid); |
| 4093 | if (err) |
| 4094 | return err; |
| 4095 | return avc_has_perm(peer_sid, node_sid, |
| 4096 | SECCLASS_NODE, NODE__RECVFROM, ad); |
| 4097 | } |
| 4098 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4099 | static int selinux_sock_rcv_skb_iptables_compat(struct sock *sk, |
| 4100 | struct sk_buff *skb, |
| 4101 | struct avc_audit_data *ad, |
| 4102 | u16 family, |
| 4103 | char *addrp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4104 | { |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4105 | int err; |
| 4106 | struct sk_security_struct *sksec = sk->sk_security; |
| 4107 | u16 sk_class; |
| 4108 | u32 netif_perm, node_perm, recv_perm; |
| 4109 | u32 port_sid, node_sid, if_sid, sk_sid; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4110 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4111 | sk_sid = sksec->sid; |
| 4112 | sk_class = sksec->sclass; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4113 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4114 | switch (sk_class) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4115 | case SECCLASS_UDP_SOCKET: |
| 4116 | netif_perm = NETIF__UDP_RECV; |
| 4117 | node_perm = NODE__UDP_RECV; |
| 4118 | recv_perm = UDP_SOCKET__RECV_MSG; |
| 4119 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4120 | case SECCLASS_TCP_SOCKET: |
| 4121 | netif_perm = NETIF__TCP_RECV; |
| 4122 | node_perm = NODE__TCP_RECV; |
| 4123 | recv_perm = TCP_SOCKET__RECV_MSG; |
| 4124 | break; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 4125 | case SECCLASS_DCCP_SOCKET: |
| 4126 | netif_perm = NETIF__DCCP_RECV; |
| 4127 | node_perm = NODE__DCCP_RECV; |
| 4128 | recv_perm = DCCP_SOCKET__RECV_MSG; |
| 4129 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4130 | default: |
| 4131 | netif_perm = NETIF__RAWIP_RECV; |
| 4132 | node_perm = NODE__RAWIP_RECV; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4133 | recv_perm = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4134 | break; |
| 4135 | } |
| 4136 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4137 | err = sel_netif_sid(skb->iif, &if_sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4138 | if (err) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4139 | return err; |
| 4140 | err = avc_has_perm(sk_sid, if_sid, SECCLASS_NETIF, netif_perm, ad); |
| 4141 | if (err) |
| 4142 | return err; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4143 | |
Paul Moore | 224dfbd | 2008-01-29 08:38:13 -0500 | [diff] [blame] | 4144 | err = sel_netnode_sid(addrp, family, &node_sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4145 | if (err) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4146 | return err; |
| 4147 | err = avc_has_perm(sk_sid, node_sid, SECCLASS_NODE, node_perm, ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4148 | if (err) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4149 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4150 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4151 | if (!recv_perm) |
| 4152 | return 0; |
Paul Moore | 3e11217 | 2008-04-10 10:48:14 -0400 | [diff] [blame] | 4153 | err = sel_netport_sid(sk->sk_protocol, |
| 4154 | ntohs(ad->u.net.sport), &port_sid); |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 4155 | if (unlikely(err)) { |
| 4156 | printk(KERN_WARNING |
| 4157 | "SELinux: failure in" |
| 4158 | " selinux_sock_rcv_skb_iptables_compat()," |
| 4159 | " network port label not found\n"); |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4160 | return err; |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 4161 | } |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4162 | return avc_has_perm(sk_sid, port_sid, sk_class, recv_perm, ad); |
| 4163 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4164 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4165 | static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb, |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4166 | u16 family) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4167 | { |
| 4168 | int err; |
| 4169 | struct sk_security_struct *sksec = sk->sk_security; |
| 4170 | u32 peer_sid; |
| 4171 | u32 sk_sid = sksec->sid; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4172 | struct avc_audit_data ad; |
| 4173 | char *addrp; |
| 4174 | |
| 4175 | AVC_AUDIT_DATA_INIT(&ad, NET); |
| 4176 | ad.u.net.netif = skb->iif; |
| 4177 | ad.u.net.family = family; |
| 4178 | err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL); |
| 4179 | if (err) |
| 4180 | return err; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4181 | |
| 4182 | if (selinux_compat_net) |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4183 | err = selinux_sock_rcv_skb_iptables_compat(sk, skb, &ad, |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4184 | family, addrp); |
| 4185 | else |
| 4186 | err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET, |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4187 | PACKET__RECV, &ad); |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4188 | if (err) |
| 4189 | return err; |
| 4190 | |
| 4191 | if (selinux_policycap_netpeer) { |
| 4192 | err = selinux_skb_peerlbl_sid(skb, family, &peer_sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4193 | if (err) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4194 | return err; |
| 4195 | err = avc_has_perm(sk_sid, peer_sid, |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4196 | SECCLASS_PEER, PEER__RECV, &ad); |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 4197 | if (err) |
| 4198 | selinux_netlbl_err(skb, err, 0); |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4199 | } else { |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4200 | err = selinux_netlbl_sock_rcv_skb(sksec, skb, family, &ad); |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4201 | if (err) |
| 4202 | return err; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4203 | err = selinux_xfrm_sock_rcv_skb(sksec->sid, skb, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4204 | } |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4205 | |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4206 | return err; |
| 4207 | } |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4208 | |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4209 | static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) |
| 4210 | { |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4211 | int err; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4212 | struct sk_security_struct *sksec = sk->sk_security; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4213 | u16 family = sk->sk_family; |
| 4214 | u32 sk_sid = sksec->sid; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4215 | struct avc_audit_data ad; |
| 4216 | char *addrp; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4217 | u8 secmark_active; |
| 4218 | u8 peerlbl_active; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4219 | |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4220 | if (family != PF_INET && family != PF_INET6) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4221 | return 0; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4222 | |
| 4223 | /* Handle mapped IPv4 packets arriving via IPv6 sockets */ |
Al Viro | 87fcd70 | 2006-12-04 22:00:55 +0000 | [diff] [blame] | 4224 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4225 | family = PF_INET; |
| 4226 | |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4227 | /* If any sort of compatibility mode is enabled then handoff processing |
| 4228 | * to the selinux_sock_rcv_skb_compat() function to deal with the |
| 4229 | * special handling. We do this in an attempt to keep this function |
| 4230 | * as fast and as clean as possible. */ |
| 4231 | if (selinux_compat_net || !selinux_policycap_netpeer) |
| 4232 | return selinux_sock_rcv_skb_compat(sk, skb, family); |
| 4233 | |
| 4234 | secmark_active = selinux_secmark_enabled(); |
| 4235 | peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled(); |
| 4236 | if (!secmark_active && !peerlbl_active) |
| 4237 | return 0; |
| 4238 | |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4239 | AVC_AUDIT_DATA_INIT(&ad, NET); |
Paul Moore | da5645a | 2008-01-29 08:38:10 -0500 | [diff] [blame] | 4240 | ad.u.net.netif = skb->iif; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4241 | ad.u.net.family = family; |
Paul Moore | 224dfbd | 2008-01-29 08:38:13 -0500 | [diff] [blame] | 4242 | err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL); |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4243 | if (err) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4244 | return err; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4245 | |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4246 | if (peerlbl_active) { |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 4247 | u32 peer_sid; |
| 4248 | |
| 4249 | err = selinux_skb_peerlbl_sid(skb, family, &peer_sid); |
| 4250 | if (err) |
| 4251 | return err; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4252 | err = selinux_inet_sys_rcv_skb(skb->iif, addrp, family, |
| 4253 | peer_sid, &ad); |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 4254 | if (err) { |
| 4255 | selinux_netlbl_err(skb, err, 0); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4256 | return err; |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 4257 | } |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 4258 | err = avc_has_perm(sk_sid, peer_sid, SECCLASS_PEER, |
| 4259 | PEER__RECV, &ad); |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 4260 | if (err) |
| 4261 | selinux_netlbl_err(skb, err, 0); |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 4262 | } |
| 4263 | |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4264 | if (secmark_active) { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4265 | err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET, |
| 4266 | PACKET__RECV, &ad); |
| 4267 | if (err) |
| 4268 | return err; |
| 4269 | } |
| 4270 | |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 4271 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4272 | } |
| 4273 | |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4274 | static int selinux_socket_getpeersec_stream(struct socket *sock, char __user *optval, |
| 4275 | int __user *optlen, unsigned len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4276 | { |
| 4277 | int err = 0; |
| 4278 | char *scontext; |
| 4279 | u32 scontext_len; |
| 4280 | struct sk_security_struct *ssec; |
| 4281 | struct inode_security_struct *isec; |
Paul Moore | 3de4bab | 2006-11-17 17:38:54 -0500 | [diff] [blame] | 4282 | u32 peer_sid = SECSID_NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4283 | |
| 4284 | isec = SOCK_INODE(sock)->i_security; |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4285 | |
Paul Moore | 3de4bab | 2006-11-17 17:38:54 -0500 | [diff] [blame] | 4286 | if (isec->sclass == SECCLASS_UNIX_STREAM_SOCKET || |
| 4287 | isec->sclass == SECCLASS_TCP_SOCKET) { |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4288 | ssec = sock->sk->sk_security; |
| 4289 | peer_sid = ssec->peer_sid; |
| 4290 | } |
Paul Moore | 3de4bab | 2006-11-17 17:38:54 -0500 | [diff] [blame] | 4291 | if (peer_sid == SECSID_NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4292 | err = -ENOPROTOOPT; |
| 4293 | goto out; |
| 4294 | } |
| 4295 | |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4296 | err = security_sid_to_context(peer_sid, &scontext, &scontext_len); |
| 4297 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4298 | if (err) |
| 4299 | goto out; |
| 4300 | |
| 4301 | if (scontext_len > len) { |
| 4302 | err = -ERANGE; |
| 4303 | goto out_len; |
| 4304 | } |
| 4305 | |
| 4306 | if (copy_to_user(optval, scontext, scontext_len)) |
| 4307 | err = -EFAULT; |
| 4308 | |
| 4309 | out_len: |
| 4310 | if (put_user(scontext_len, optlen)) |
| 4311 | err = -EFAULT; |
| 4312 | |
| 4313 | kfree(scontext); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4314 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4315 | return err; |
| 4316 | } |
| 4317 | |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 4318 | static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid) |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4319 | { |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 4320 | u32 peer_secid = SECSID_NULL; |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4321 | u16 family; |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 4322 | |
Paul Moore | aa86290 | 2008-10-10 10:16:29 -0400 | [diff] [blame] | 4323 | if (skb && skb->protocol == htons(ETH_P_IP)) |
| 4324 | family = PF_INET; |
| 4325 | else if (skb && skb->protocol == htons(ETH_P_IPV6)) |
| 4326 | family = PF_INET6; |
| 4327 | else if (sock) |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4328 | family = sock->sk->sk_family; |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4329 | else |
| 4330 | goto out; |
| 4331 | |
| 4332 | if (sock && family == PF_UNIX) |
Ahmed S. Darwish | 713a04a | 2008-03-01 21:52:30 +0200 | [diff] [blame] | 4333 | selinux_inode_getsecid(SOCK_INODE(sock), &peer_secid); |
Paul Moore | 3de4bab | 2006-11-17 17:38:54 -0500 | [diff] [blame] | 4334 | else if (skb) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4335 | selinux_skb_peerlbl_sid(skb, family, &peer_secid); |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4336 | |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4337 | out: |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 4338 | *secid = peer_secid; |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4339 | if (peer_secid == SECSID_NULL) |
| 4340 | return -EINVAL; |
| 4341 | return 0; |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4342 | } |
| 4343 | |
Al Viro | 7d877f3 | 2005-10-21 03:20:43 -0400 | [diff] [blame] | 4344 | static int selinux_sk_alloc_security(struct sock *sk, int family, gfp_t priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4345 | { |
| 4346 | return sk_alloc_security(sk, family, priority); |
| 4347 | } |
| 4348 | |
| 4349 | static void selinux_sk_free_security(struct sock *sk) |
| 4350 | { |
| 4351 | sk_free_security(sk); |
| 4352 | } |
| 4353 | |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4354 | static void selinux_sk_clone_security(const struct sock *sk, struct sock *newsk) |
| 4355 | { |
| 4356 | struct sk_security_struct *ssec = sk->sk_security; |
| 4357 | struct sk_security_struct *newssec = newsk->sk_security; |
| 4358 | |
| 4359 | newssec->sid = ssec->sid; |
| 4360 | newssec->peer_sid = ssec->peer_sid; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4361 | newssec->sclass = ssec->sclass; |
Paul Moore | 99f59ed | 2006-08-29 17:53:48 -0700 | [diff] [blame] | 4362 | |
Paul Moore | f74af6e | 2008-02-25 11:40:33 -0500 | [diff] [blame] | 4363 | selinux_netlbl_sk_security_reset(newssec, newsk->sk_family); |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4364 | } |
| 4365 | |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 4366 | static void selinux_sk_getsecid(struct sock *sk, u32 *secid) |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4367 | { |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4368 | if (!sk) |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 4369 | *secid = SECINITSID_ANY_SOCKET; |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4370 | else { |
| 4371 | struct sk_security_struct *sksec = sk->sk_security; |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4372 | |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 4373 | *secid = sksec->sid; |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4374 | } |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4375 | } |
| 4376 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4377 | static void selinux_sock_graft(struct sock *sk, struct socket *parent) |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4378 | { |
| 4379 | struct inode_security_struct *isec = SOCK_INODE(parent)->i_security; |
| 4380 | struct sk_security_struct *sksec = sk->sk_security; |
| 4381 | |
David Woodhouse | 2148ccc | 2006-09-29 15:50:25 -0700 | [diff] [blame] | 4382 | if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6 || |
| 4383 | sk->sk_family == PF_UNIX) |
| 4384 | isec->sid = sksec->sid; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4385 | sksec->sclass = isec->sclass; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4386 | } |
| 4387 | |
Adrian Bunk | 9a673e5 | 2006-08-15 00:03:53 -0700 | [diff] [blame] | 4388 | static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb, |
| 4389 | struct request_sock *req) |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4390 | { |
| 4391 | struct sk_security_struct *sksec = sk->sk_security; |
| 4392 | int err; |
Paul Moore | aa86290 | 2008-10-10 10:16:29 -0400 | [diff] [blame] | 4393 | u16 family = sk->sk_family; |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 4394 | u32 newsid; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4395 | u32 peersid; |
| 4396 | |
Paul Moore | aa86290 | 2008-10-10 10:16:29 -0400 | [diff] [blame] | 4397 | /* handle mapped IPv4 packets arriving via IPv6 sockets */ |
| 4398 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) |
| 4399 | family = PF_INET; |
| 4400 | |
| 4401 | err = selinux_skb_peerlbl_sid(skb, family, &peersid); |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4402 | if (err) |
| 4403 | return err; |
Venkat Yekkirala | a51c64f | 2006-07-27 22:01:34 -0700 | [diff] [blame] | 4404 | if (peersid == SECSID_NULL) { |
| 4405 | req->secid = sksec->sid; |
Paul Moore | 3de4bab | 2006-11-17 17:38:54 -0500 | [diff] [blame] | 4406 | req->peer_secid = SECSID_NULL; |
Venkat Yekkirala | a51c64f | 2006-07-27 22:01:34 -0700 | [diff] [blame] | 4407 | return 0; |
| 4408 | } |
| 4409 | |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4410 | err = security_sid_mls_copy(sksec->sid, peersid, &newsid); |
| 4411 | if (err) |
| 4412 | return err; |
| 4413 | |
| 4414 | req->secid = newsid; |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 4415 | req->peer_secid = peersid; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4416 | return 0; |
| 4417 | } |
| 4418 | |
Adrian Bunk | 9a673e5 | 2006-08-15 00:03:53 -0700 | [diff] [blame] | 4419 | static void selinux_inet_csk_clone(struct sock *newsk, |
| 4420 | const struct request_sock *req) |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4421 | { |
| 4422 | struct sk_security_struct *newsksec = newsk->sk_security; |
| 4423 | |
| 4424 | newsksec->sid = req->secid; |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 4425 | newsksec->peer_sid = req->peer_secid; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4426 | /* NOTE: Ideally, we should also get the isec->sid for the |
| 4427 | new socket in sync, but we don't have the isec available yet. |
| 4428 | So we will wait until sock_graft to do it, by which |
| 4429 | time it will have been created and available. */ |
Paul Moore | 99f59ed | 2006-08-29 17:53:48 -0700 | [diff] [blame] | 4430 | |
Paul Moore | 9f2ad66 | 2006-11-17 17:38:53 -0500 | [diff] [blame] | 4431 | /* We don't need to take any sort of lock here as we are the only |
| 4432 | * thread with access to newsksec */ |
| 4433 | selinux_netlbl_sk_security_reset(newsksec, req->rsk_ops->family); |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4434 | } |
| 4435 | |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 4436 | static void selinux_inet_conn_established(struct sock *sk, struct sk_buff *skb) |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 4437 | { |
Paul Moore | aa86290 | 2008-10-10 10:16:29 -0400 | [diff] [blame] | 4438 | u16 family = sk->sk_family; |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 4439 | struct sk_security_struct *sksec = sk->sk_security; |
| 4440 | |
Paul Moore | aa86290 | 2008-10-10 10:16:29 -0400 | [diff] [blame] | 4441 | /* handle mapped IPv4 packets arriving via IPv6 sockets */ |
| 4442 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) |
| 4443 | family = PF_INET; |
| 4444 | |
| 4445 | selinux_skb_peerlbl_sid(skb, family, &sksec->peer_sid); |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 4446 | |
| 4447 | selinux_netlbl_inet_conn_established(sk, family); |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 4448 | } |
| 4449 | |
Adrian Bunk | 9a673e5 | 2006-08-15 00:03:53 -0700 | [diff] [blame] | 4450 | static void selinux_req_classify_flow(const struct request_sock *req, |
| 4451 | struct flowi *fl) |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4452 | { |
| 4453 | fl->secid = req->secid; |
| 4454 | } |
| 4455 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4456 | static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb) |
| 4457 | { |
| 4458 | int err = 0; |
| 4459 | u32 perm; |
| 4460 | struct nlmsghdr *nlh; |
| 4461 | struct socket *sock = sk->sk_socket; |
| 4462 | struct inode_security_struct *isec = SOCK_INODE(sock)->i_security; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4463 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4464 | if (skb->len < NLMSG_SPACE(0)) { |
| 4465 | err = -EINVAL; |
| 4466 | goto out; |
| 4467 | } |
Arnaldo Carvalho de Melo | b529ccf | 2007-04-25 19:08:35 -0700 | [diff] [blame] | 4468 | nlh = nlmsg_hdr(skb); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4469 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4470 | err = selinux_nlmsg_lookup(isec->sclass, nlh->nlmsg_type, &perm); |
| 4471 | if (err) { |
| 4472 | if (err == -EINVAL) { |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 4473 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_SELINUX_ERR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4474 | "SELinux: unrecognized netlink message" |
| 4475 | " type=%hu for sclass=%hu\n", |
| 4476 | nlh->nlmsg_type, isec->sclass); |
Eric Paris | 39c9aed | 2008-11-05 09:34:42 -0500 | [diff] [blame] | 4477 | if (!selinux_enforcing || security_get_allow_unknown()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4478 | err = 0; |
| 4479 | } |
| 4480 | |
| 4481 | /* Ignore */ |
| 4482 | if (err == -ENOENT) |
| 4483 | err = 0; |
| 4484 | goto out; |
| 4485 | } |
| 4486 | |
| 4487 | err = socket_has_perm(current, sock, perm); |
| 4488 | out: |
| 4489 | return err; |
| 4490 | } |
| 4491 | |
| 4492 | #ifdef CONFIG_NETFILTER |
| 4493 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4494 | static unsigned int selinux_ip_forward(struct sk_buff *skb, int ifindex, |
| 4495 | u16 family) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4496 | { |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 4497 | int err; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4498 | char *addrp; |
| 4499 | u32 peer_sid; |
| 4500 | struct avc_audit_data ad; |
| 4501 | u8 secmark_active; |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 4502 | u8 netlbl_active; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4503 | u8 peerlbl_active; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4504 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4505 | if (!selinux_policycap_netpeer) |
| 4506 | return NF_ACCEPT; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4507 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4508 | secmark_active = selinux_secmark_enabled(); |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 4509 | netlbl_active = netlbl_enabled(); |
| 4510 | peerlbl_active = netlbl_active || selinux_xfrm_enabled(); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4511 | if (!secmark_active && !peerlbl_active) |
| 4512 | return NF_ACCEPT; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4513 | |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4514 | if (selinux_skb_peerlbl_sid(skb, family, &peer_sid) != 0) |
| 4515 | return NF_DROP; |
| 4516 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4517 | AVC_AUDIT_DATA_INIT(&ad, NET); |
| 4518 | ad.u.net.netif = ifindex; |
| 4519 | ad.u.net.family = family; |
| 4520 | if (selinux_parse_skb(skb, &ad, &addrp, 1, NULL) != 0) |
| 4521 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4522 | |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 4523 | if (peerlbl_active) { |
| 4524 | err = selinux_inet_sys_rcv_skb(ifindex, addrp, family, |
| 4525 | peer_sid, &ad); |
| 4526 | if (err) { |
| 4527 | selinux_netlbl_err(skb, err, 1); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4528 | return NF_DROP; |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 4529 | } |
| 4530 | } |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4531 | |
| 4532 | if (secmark_active) |
| 4533 | if (avc_has_perm(peer_sid, skb->secmark, |
| 4534 | SECCLASS_PACKET, PACKET__FORWARD_IN, &ad)) |
| 4535 | return NF_DROP; |
| 4536 | |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 4537 | if (netlbl_active) |
| 4538 | /* we do this in the FORWARD path and not the POST_ROUTING |
| 4539 | * path because we want to make sure we apply the necessary |
| 4540 | * labeling before IPsec is applied so we can leverage AH |
| 4541 | * protection */ |
| 4542 | if (selinux_netlbl_skbuff_setsid(skb, family, peer_sid) != 0) |
| 4543 | return NF_DROP; |
| 4544 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4545 | return NF_ACCEPT; |
| 4546 | } |
| 4547 | |
| 4548 | static unsigned int selinux_ipv4_forward(unsigned int hooknum, |
| 4549 | struct sk_buff *skb, |
| 4550 | const struct net_device *in, |
| 4551 | const struct net_device *out, |
| 4552 | int (*okfn)(struct sk_buff *)) |
| 4553 | { |
| 4554 | return selinux_ip_forward(skb, in->ifindex, PF_INET); |
| 4555 | } |
| 4556 | |
| 4557 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 4558 | static unsigned int selinux_ipv6_forward(unsigned int hooknum, |
| 4559 | struct sk_buff *skb, |
| 4560 | const struct net_device *in, |
| 4561 | const struct net_device *out, |
| 4562 | int (*okfn)(struct sk_buff *)) |
| 4563 | { |
| 4564 | return selinux_ip_forward(skb, in->ifindex, PF_INET6); |
| 4565 | } |
| 4566 | #endif /* IPV6 */ |
| 4567 | |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 4568 | static unsigned int selinux_ip_output(struct sk_buff *skb, |
| 4569 | u16 family) |
| 4570 | { |
| 4571 | u32 sid; |
| 4572 | |
| 4573 | if (!netlbl_enabled()) |
| 4574 | return NF_ACCEPT; |
| 4575 | |
| 4576 | /* we do this in the LOCAL_OUT path and not the POST_ROUTING path |
| 4577 | * because we want to make sure we apply the necessary labeling |
| 4578 | * before IPsec is applied so we can leverage AH protection */ |
| 4579 | if (skb->sk) { |
| 4580 | struct sk_security_struct *sksec = skb->sk->sk_security; |
| 4581 | sid = sksec->sid; |
| 4582 | } else |
| 4583 | sid = SECINITSID_KERNEL; |
| 4584 | if (selinux_netlbl_skbuff_setsid(skb, family, sid) != 0) |
| 4585 | return NF_DROP; |
| 4586 | |
| 4587 | return NF_ACCEPT; |
| 4588 | } |
| 4589 | |
| 4590 | static unsigned int selinux_ipv4_output(unsigned int hooknum, |
| 4591 | struct sk_buff *skb, |
| 4592 | const struct net_device *in, |
| 4593 | const struct net_device *out, |
| 4594 | int (*okfn)(struct sk_buff *)) |
| 4595 | { |
| 4596 | return selinux_ip_output(skb, PF_INET); |
| 4597 | } |
| 4598 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4599 | static int selinux_ip_postroute_iptables_compat(struct sock *sk, |
| 4600 | int ifindex, |
| 4601 | struct avc_audit_data *ad, |
| 4602 | u16 family, char *addrp) |
| 4603 | { |
| 4604 | int err; |
| 4605 | struct sk_security_struct *sksec = sk->sk_security; |
| 4606 | u16 sk_class; |
| 4607 | u32 netif_perm, node_perm, send_perm; |
| 4608 | u32 port_sid, node_sid, if_sid, sk_sid; |
| 4609 | |
| 4610 | sk_sid = sksec->sid; |
| 4611 | sk_class = sksec->sclass; |
| 4612 | |
| 4613 | switch (sk_class) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4614 | case SECCLASS_UDP_SOCKET: |
| 4615 | netif_perm = NETIF__UDP_SEND; |
| 4616 | node_perm = NODE__UDP_SEND; |
| 4617 | send_perm = UDP_SOCKET__SEND_MSG; |
| 4618 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4619 | case SECCLASS_TCP_SOCKET: |
| 4620 | netif_perm = NETIF__TCP_SEND; |
| 4621 | node_perm = NODE__TCP_SEND; |
| 4622 | send_perm = TCP_SOCKET__SEND_MSG; |
| 4623 | break; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 4624 | case SECCLASS_DCCP_SOCKET: |
| 4625 | netif_perm = NETIF__DCCP_SEND; |
| 4626 | node_perm = NODE__DCCP_SEND; |
| 4627 | send_perm = DCCP_SOCKET__SEND_MSG; |
| 4628 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4629 | default: |
| 4630 | netif_perm = NETIF__RAWIP_SEND; |
| 4631 | node_perm = NODE__RAWIP_SEND; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4632 | send_perm = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4633 | break; |
| 4634 | } |
| 4635 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4636 | err = sel_netif_sid(ifindex, &if_sid); |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4637 | if (err) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4638 | return err; |
| 4639 | err = avc_has_perm(sk_sid, if_sid, SECCLASS_NETIF, netif_perm, ad); |
| 4640 | return err; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4641 | |
Paul Moore | 224dfbd | 2008-01-29 08:38:13 -0500 | [diff] [blame] | 4642 | err = sel_netnode_sid(addrp, family, &node_sid); |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4643 | if (err) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4644 | return err; |
| 4645 | err = avc_has_perm(sk_sid, node_sid, SECCLASS_NODE, node_perm, ad); |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4646 | if (err) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4647 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4648 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4649 | if (send_perm != 0) |
| 4650 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4651 | |
Paul Moore | 3e11217 | 2008-04-10 10:48:14 -0400 | [diff] [blame] | 4652 | err = sel_netport_sid(sk->sk_protocol, |
| 4653 | ntohs(ad->u.net.dport), &port_sid); |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 4654 | if (unlikely(err)) { |
| 4655 | printk(KERN_WARNING |
| 4656 | "SELinux: failure in" |
| 4657 | " selinux_ip_postroute_iptables_compat()," |
| 4658 | " network port label not found\n"); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4659 | return err; |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 4660 | } |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4661 | return avc_has_perm(sk_sid, port_sid, sk_class, send_perm, ad); |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4662 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4663 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4664 | static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb, |
| 4665 | int ifindex, |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4666 | u16 family) |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4667 | { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4668 | struct sock *sk = skb->sk; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4669 | struct sk_security_struct *sksec; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4670 | struct avc_audit_data ad; |
| 4671 | char *addrp; |
| 4672 | u8 proto; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4673 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4674 | if (sk == NULL) |
| 4675 | return NF_ACCEPT; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4676 | sksec = sk->sk_security; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4677 | |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4678 | AVC_AUDIT_DATA_INIT(&ad, NET); |
| 4679 | ad.u.net.netif = ifindex; |
| 4680 | ad.u.net.family = family; |
| 4681 | if (selinux_parse_skb(skb, &ad, &addrp, 0, &proto)) |
| 4682 | return NF_DROP; |
| 4683 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4684 | if (selinux_compat_net) { |
| 4685 | if (selinux_ip_postroute_iptables_compat(skb->sk, ifindex, |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4686 | &ad, family, addrp)) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4687 | return NF_DROP; |
| 4688 | } else { |
| 4689 | if (avc_has_perm(sksec->sid, skb->secmark, |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4690 | SECCLASS_PACKET, PACKET__SEND, &ad)) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4691 | return NF_DROP; |
| 4692 | } |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4693 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4694 | if (selinux_policycap_netpeer) |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4695 | if (selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto)) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4696 | return NF_DROP; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4697 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4698 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4699 | } |
| 4700 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4701 | static unsigned int selinux_ip_postroute(struct sk_buff *skb, int ifindex, |
| 4702 | u16 family) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4703 | { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4704 | u32 secmark_perm; |
| 4705 | u32 peer_sid; |
| 4706 | struct sock *sk; |
| 4707 | struct avc_audit_data ad; |
| 4708 | char *addrp; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4709 | u8 secmark_active; |
| 4710 | u8 peerlbl_active; |
| 4711 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4712 | /* If any sort of compatibility mode is enabled then handoff processing |
| 4713 | * to the selinux_ip_postroute_compat() function to deal with the |
| 4714 | * special handling. We do this in an attempt to keep this function |
| 4715 | * as fast and as clean as possible. */ |
| 4716 | if (selinux_compat_net || !selinux_policycap_netpeer) |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4717 | return selinux_ip_postroute_compat(skb, ifindex, family); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4718 | |
| 4719 | /* If skb->dst->xfrm is non-NULL then the packet is undergoing an IPsec |
| 4720 | * packet transformation so allow the packet to pass without any checks |
| 4721 | * since we'll have another chance to perform access control checks |
| 4722 | * when the packet is on it's final way out. |
| 4723 | * NOTE: there appear to be some IPv6 multicast cases where skb->dst |
| 4724 | * is NULL, in this case go ahead and apply access control. */ |
| 4725 | if (skb->dst != NULL && skb->dst->xfrm != NULL) |
| 4726 | return NF_ACCEPT; |
| 4727 | |
| 4728 | secmark_active = selinux_secmark_enabled(); |
| 4729 | peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled(); |
| 4730 | if (!secmark_active && !peerlbl_active) |
| 4731 | return NF_ACCEPT; |
| 4732 | |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4733 | /* if the packet is being forwarded then get the peer label from the |
| 4734 | * packet itself; otherwise check to see if it is from a local |
| 4735 | * application or the kernel, if from an application get the peer label |
| 4736 | * from the sending socket, otherwise use the kernel's sid */ |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4737 | sk = skb->sk; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4738 | if (sk == NULL) { |
| 4739 | switch (family) { |
| 4740 | case PF_INET: |
| 4741 | if (IPCB(skb)->flags & IPSKB_FORWARDED) |
| 4742 | secmark_perm = PACKET__FORWARD_OUT; |
| 4743 | else |
| 4744 | secmark_perm = PACKET__SEND; |
| 4745 | break; |
| 4746 | case PF_INET6: |
| 4747 | if (IP6CB(skb)->flags & IP6SKB_FORWARDED) |
| 4748 | secmark_perm = PACKET__FORWARD_OUT; |
| 4749 | else |
| 4750 | secmark_perm = PACKET__SEND; |
| 4751 | break; |
| 4752 | default: |
| 4753 | return NF_DROP; |
| 4754 | } |
| 4755 | if (secmark_perm == PACKET__FORWARD_OUT) { |
| 4756 | if (selinux_skb_peerlbl_sid(skb, family, &peer_sid)) |
| 4757 | return NF_DROP; |
| 4758 | } else |
| 4759 | peer_sid = SECINITSID_KERNEL; |
| 4760 | } else { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4761 | struct sk_security_struct *sksec = sk->sk_security; |
| 4762 | peer_sid = sksec->sid; |
| 4763 | secmark_perm = PACKET__SEND; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4764 | } |
| 4765 | |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4766 | AVC_AUDIT_DATA_INIT(&ad, NET); |
| 4767 | ad.u.net.netif = ifindex; |
| 4768 | ad.u.net.family = family; |
| 4769 | if (selinux_parse_skb(skb, &ad, &addrp, 0, NULL)) |
| 4770 | return NF_DROP; |
| 4771 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4772 | if (secmark_active) |
| 4773 | if (avc_has_perm(peer_sid, skb->secmark, |
| 4774 | SECCLASS_PACKET, secmark_perm, &ad)) |
| 4775 | return NF_DROP; |
| 4776 | |
| 4777 | if (peerlbl_active) { |
| 4778 | u32 if_sid; |
| 4779 | u32 node_sid; |
| 4780 | |
| 4781 | if (sel_netif_sid(ifindex, &if_sid)) |
| 4782 | return NF_DROP; |
| 4783 | if (avc_has_perm(peer_sid, if_sid, |
| 4784 | SECCLASS_NETIF, NETIF__EGRESS, &ad)) |
| 4785 | return NF_DROP; |
| 4786 | |
| 4787 | if (sel_netnode_sid(addrp, family, &node_sid)) |
| 4788 | return NF_DROP; |
| 4789 | if (avc_has_perm(peer_sid, node_sid, |
| 4790 | SECCLASS_NODE, NODE__SENDTO, &ad)) |
| 4791 | return NF_DROP; |
| 4792 | } |
| 4793 | |
| 4794 | return NF_ACCEPT; |
| 4795 | } |
| 4796 | |
| 4797 | static unsigned int selinux_ipv4_postroute(unsigned int hooknum, |
| 4798 | struct sk_buff *skb, |
| 4799 | const struct net_device *in, |
| 4800 | const struct net_device *out, |
| 4801 | int (*okfn)(struct sk_buff *)) |
| 4802 | { |
| 4803 | return selinux_ip_postroute(skb, out->ifindex, PF_INET); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4804 | } |
| 4805 | |
| 4806 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4807 | static unsigned int selinux_ipv6_postroute(unsigned int hooknum, |
| 4808 | struct sk_buff *skb, |
| 4809 | const struct net_device *in, |
| 4810 | const struct net_device *out, |
| 4811 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4812 | { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4813 | return selinux_ip_postroute(skb, out->ifindex, PF_INET6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4814 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4815 | #endif /* IPV6 */ |
| 4816 | |
| 4817 | #endif /* CONFIG_NETFILTER */ |
| 4818 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4819 | static int selinux_netlink_send(struct sock *sk, struct sk_buff *skb) |
| 4820 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4821 | int err; |
| 4822 | |
| 4823 | err = secondary_ops->netlink_send(sk, skb); |
| 4824 | if (err) |
| 4825 | return err; |
| 4826 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4827 | if (policydb_loaded_version >= POLICYDB_VERSION_NLCLASS) |
| 4828 | err = selinux_nlmsg_perm(sk, skb); |
| 4829 | |
| 4830 | return err; |
| 4831 | } |
| 4832 | |
Darrel Goeddel | c7bdb54 | 2006-06-27 13:26:11 -0700 | [diff] [blame] | 4833 | static int selinux_netlink_recv(struct sk_buff *skb, int capability) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4834 | { |
Darrel Goeddel | c7bdb54 | 2006-06-27 13:26:11 -0700 | [diff] [blame] | 4835 | int err; |
| 4836 | struct avc_audit_data ad; |
| 4837 | |
| 4838 | err = secondary_ops->netlink_recv(skb, capability); |
| 4839 | if (err) |
| 4840 | return err; |
| 4841 | |
| 4842 | AVC_AUDIT_DATA_INIT(&ad, CAP); |
| 4843 | ad.u.cap = capability; |
| 4844 | |
| 4845 | return avc_has_perm(NETLINK_CB(skb).sid, NETLINK_CB(skb).sid, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4846 | SECCLASS_CAPABILITY, CAP_TO_MASK(capability), &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4847 | } |
| 4848 | |
| 4849 | static int ipc_alloc_security(struct task_struct *task, |
| 4850 | struct kern_ipc_perm *perm, |
| 4851 | u16 sclass) |
| 4852 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4853 | struct ipc_security_struct *isec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4854 | u32 sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4855 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 4856 | isec = kzalloc(sizeof(struct ipc_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4857 | if (!isec) |
| 4858 | return -ENOMEM; |
| 4859 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4860 | sid = task_sid(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4861 | isec->sclass = sclass; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4862 | isec->sid = sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4863 | perm->security = isec; |
| 4864 | |
| 4865 | return 0; |
| 4866 | } |
| 4867 | |
| 4868 | static void ipc_free_security(struct kern_ipc_perm *perm) |
| 4869 | { |
| 4870 | struct ipc_security_struct *isec = perm->security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4871 | perm->security = NULL; |
| 4872 | kfree(isec); |
| 4873 | } |
| 4874 | |
| 4875 | static int msg_msg_alloc_security(struct msg_msg *msg) |
| 4876 | { |
| 4877 | struct msg_security_struct *msec; |
| 4878 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 4879 | msec = kzalloc(sizeof(struct msg_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4880 | if (!msec) |
| 4881 | return -ENOMEM; |
| 4882 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4883 | msec->sid = SECINITSID_UNLABELED; |
| 4884 | msg->security = msec; |
| 4885 | |
| 4886 | return 0; |
| 4887 | } |
| 4888 | |
| 4889 | static void msg_msg_free_security(struct msg_msg *msg) |
| 4890 | { |
| 4891 | struct msg_security_struct *msec = msg->security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4892 | |
| 4893 | msg->security = NULL; |
| 4894 | kfree(msec); |
| 4895 | } |
| 4896 | |
| 4897 | static int ipc_has_perm(struct kern_ipc_perm *ipc_perms, |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 4898 | u32 perms) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4899 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4900 | struct ipc_security_struct *isec; |
| 4901 | struct avc_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4902 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4903 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4904 | isec = ipc_perms->security; |
| 4905 | |
| 4906 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 4907 | ad.u.ipc_id = ipc_perms->key; |
| 4908 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4909 | return avc_has_perm(sid, isec->sid, isec->sclass, perms, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4910 | } |
| 4911 | |
| 4912 | static int selinux_msg_msg_alloc_security(struct msg_msg *msg) |
| 4913 | { |
| 4914 | return msg_msg_alloc_security(msg); |
| 4915 | } |
| 4916 | |
| 4917 | static void selinux_msg_msg_free_security(struct msg_msg *msg) |
| 4918 | { |
| 4919 | msg_msg_free_security(msg); |
| 4920 | } |
| 4921 | |
| 4922 | /* message queue security operations */ |
| 4923 | static int selinux_msg_queue_alloc_security(struct msg_queue *msq) |
| 4924 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4925 | struct ipc_security_struct *isec; |
| 4926 | struct avc_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4927 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4928 | int rc; |
| 4929 | |
| 4930 | rc = ipc_alloc_security(current, &msq->q_perm, SECCLASS_MSGQ); |
| 4931 | if (rc) |
| 4932 | return rc; |
| 4933 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4934 | isec = msq->q_perm.security; |
| 4935 | |
| 4936 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4937 | ad.u.ipc_id = msq->q_perm.key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4938 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4939 | rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4940 | MSGQ__CREATE, &ad); |
| 4941 | if (rc) { |
| 4942 | ipc_free_security(&msq->q_perm); |
| 4943 | return rc; |
| 4944 | } |
| 4945 | return 0; |
| 4946 | } |
| 4947 | |
| 4948 | static void selinux_msg_queue_free_security(struct msg_queue *msq) |
| 4949 | { |
| 4950 | ipc_free_security(&msq->q_perm); |
| 4951 | } |
| 4952 | |
| 4953 | static int selinux_msg_queue_associate(struct msg_queue *msq, int msqflg) |
| 4954 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4955 | struct ipc_security_struct *isec; |
| 4956 | struct avc_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4957 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4958 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4959 | isec = msq->q_perm.security; |
| 4960 | |
| 4961 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 4962 | ad.u.ipc_id = msq->q_perm.key; |
| 4963 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4964 | return avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4965 | MSGQ__ASSOCIATE, &ad); |
| 4966 | } |
| 4967 | |
| 4968 | static int selinux_msg_queue_msgctl(struct msg_queue *msq, int cmd) |
| 4969 | { |
| 4970 | int err; |
| 4971 | int perms; |
| 4972 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4973 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4974 | case IPC_INFO: |
| 4975 | case MSG_INFO: |
| 4976 | /* No specific object, just general system-wide information. */ |
| 4977 | return task_has_system(current, SYSTEM__IPC_INFO); |
| 4978 | case IPC_STAT: |
| 4979 | case MSG_STAT: |
| 4980 | perms = MSGQ__GETATTR | MSGQ__ASSOCIATE; |
| 4981 | break; |
| 4982 | case IPC_SET: |
| 4983 | perms = MSGQ__SETATTR; |
| 4984 | break; |
| 4985 | case IPC_RMID: |
| 4986 | perms = MSGQ__DESTROY; |
| 4987 | break; |
| 4988 | default: |
| 4989 | return 0; |
| 4990 | } |
| 4991 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 4992 | err = ipc_has_perm(&msq->q_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4993 | return err; |
| 4994 | } |
| 4995 | |
| 4996 | static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, int msqflg) |
| 4997 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4998 | struct ipc_security_struct *isec; |
| 4999 | struct msg_security_struct *msec; |
| 5000 | struct avc_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5001 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5002 | int rc; |
| 5003 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5004 | isec = msq->q_perm.security; |
| 5005 | msec = msg->security; |
| 5006 | |
| 5007 | /* |
| 5008 | * First time through, need to assign label to the message |
| 5009 | */ |
| 5010 | if (msec->sid == SECINITSID_UNLABELED) { |
| 5011 | /* |
| 5012 | * Compute new sid based on current process and |
| 5013 | * message queue this message will be stored in |
| 5014 | */ |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5015 | rc = security_transition_sid(sid, isec->sid, SECCLASS_MSG, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5016 | &msec->sid); |
| 5017 | if (rc) |
| 5018 | return rc; |
| 5019 | } |
| 5020 | |
| 5021 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 5022 | ad.u.ipc_id = msq->q_perm.key; |
| 5023 | |
| 5024 | /* Can this process write to the queue? */ |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5025 | rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5026 | MSGQ__WRITE, &ad); |
| 5027 | if (!rc) |
| 5028 | /* Can this process send the message */ |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5029 | rc = avc_has_perm(sid, msec->sid, SECCLASS_MSG, |
| 5030 | MSG__SEND, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5031 | if (!rc) |
| 5032 | /* Can the message be put in the queue? */ |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5033 | rc = avc_has_perm(msec->sid, isec->sid, SECCLASS_MSGQ, |
| 5034 | MSGQ__ENQUEUE, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5035 | |
| 5036 | return rc; |
| 5037 | } |
| 5038 | |
| 5039 | static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, |
| 5040 | struct task_struct *target, |
| 5041 | long type, int mode) |
| 5042 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5043 | struct ipc_security_struct *isec; |
| 5044 | struct msg_security_struct *msec; |
| 5045 | struct avc_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5046 | u32 sid = task_sid(target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5047 | int rc; |
| 5048 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5049 | isec = msq->q_perm.security; |
| 5050 | msec = msg->security; |
| 5051 | |
| 5052 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5053 | ad.u.ipc_id = msq->q_perm.key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5054 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5055 | rc = avc_has_perm(sid, isec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5056 | SECCLASS_MSGQ, MSGQ__READ, &ad); |
| 5057 | if (!rc) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5058 | rc = avc_has_perm(sid, msec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5059 | SECCLASS_MSG, MSG__RECEIVE, &ad); |
| 5060 | return rc; |
| 5061 | } |
| 5062 | |
| 5063 | /* Shared Memory security operations */ |
| 5064 | static int selinux_shm_alloc_security(struct shmid_kernel *shp) |
| 5065 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5066 | struct ipc_security_struct *isec; |
| 5067 | struct avc_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5068 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5069 | int rc; |
| 5070 | |
| 5071 | rc = ipc_alloc_security(current, &shp->shm_perm, SECCLASS_SHM); |
| 5072 | if (rc) |
| 5073 | return rc; |
| 5074 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5075 | isec = shp->shm_perm.security; |
| 5076 | |
| 5077 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5078 | ad.u.ipc_id = shp->shm_perm.key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5079 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5080 | rc = avc_has_perm(sid, isec->sid, SECCLASS_SHM, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5081 | SHM__CREATE, &ad); |
| 5082 | if (rc) { |
| 5083 | ipc_free_security(&shp->shm_perm); |
| 5084 | return rc; |
| 5085 | } |
| 5086 | return 0; |
| 5087 | } |
| 5088 | |
| 5089 | static void selinux_shm_free_security(struct shmid_kernel *shp) |
| 5090 | { |
| 5091 | ipc_free_security(&shp->shm_perm); |
| 5092 | } |
| 5093 | |
| 5094 | static int selinux_shm_associate(struct shmid_kernel *shp, int shmflg) |
| 5095 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5096 | struct ipc_security_struct *isec; |
| 5097 | struct avc_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5098 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5099 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5100 | isec = shp->shm_perm.security; |
| 5101 | |
| 5102 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 5103 | ad.u.ipc_id = shp->shm_perm.key; |
| 5104 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5105 | return avc_has_perm(sid, isec->sid, SECCLASS_SHM, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5106 | SHM__ASSOCIATE, &ad); |
| 5107 | } |
| 5108 | |
| 5109 | /* Note, at this point, shp is locked down */ |
| 5110 | static int selinux_shm_shmctl(struct shmid_kernel *shp, int cmd) |
| 5111 | { |
| 5112 | int perms; |
| 5113 | int err; |
| 5114 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5115 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5116 | case IPC_INFO: |
| 5117 | case SHM_INFO: |
| 5118 | /* No specific object, just general system-wide information. */ |
| 5119 | return task_has_system(current, SYSTEM__IPC_INFO); |
| 5120 | case IPC_STAT: |
| 5121 | case SHM_STAT: |
| 5122 | perms = SHM__GETATTR | SHM__ASSOCIATE; |
| 5123 | break; |
| 5124 | case IPC_SET: |
| 5125 | perms = SHM__SETATTR; |
| 5126 | break; |
| 5127 | case SHM_LOCK: |
| 5128 | case SHM_UNLOCK: |
| 5129 | perms = SHM__LOCK; |
| 5130 | break; |
| 5131 | case IPC_RMID: |
| 5132 | perms = SHM__DESTROY; |
| 5133 | break; |
| 5134 | default: |
| 5135 | return 0; |
| 5136 | } |
| 5137 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 5138 | err = ipc_has_perm(&shp->shm_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5139 | return err; |
| 5140 | } |
| 5141 | |
| 5142 | static int selinux_shm_shmat(struct shmid_kernel *shp, |
| 5143 | char __user *shmaddr, int shmflg) |
| 5144 | { |
| 5145 | u32 perms; |
| 5146 | int rc; |
| 5147 | |
| 5148 | rc = secondary_ops->shm_shmat(shp, shmaddr, shmflg); |
| 5149 | if (rc) |
| 5150 | return rc; |
| 5151 | |
| 5152 | if (shmflg & SHM_RDONLY) |
| 5153 | perms = SHM__READ; |
| 5154 | else |
| 5155 | perms = SHM__READ | SHM__WRITE; |
| 5156 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 5157 | return ipc_has_perm(&shp->shm_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5158 | } |
| 5159 | |
| 5160 | /* Semaphore security operations */ |
| 5161 | static int selinux_sem_alloc_security(struct sem_array *sma) |
| 5162 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5163 | struct ipc_security_struct *isec; |
| 5164 | struct avc_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5165 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5166 | int rc; |
| 5167 | |
| 5168 | rc = ipc_alloc_security(current, &sma->sem_perm, SECCLASS_SEM); |
| 5169 | if (rc) |
| 5170 | return rc; |
| 5171 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5172 | isec = sma->sem_perm.security; |
| 5173 | |
| 5174 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5175 | ad.u.ipc_id = sma->sem_perm.key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5176 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5177 | rc = avc_has_perm(sid, isec->sid, SECCLASS_SEM, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5178 | SEM__CREATE, &ad); |
| 5179 | if (rc) { |
| 5180 | ipc_free_security(&sma->sem_perm); |
| 5181 | return rc; |
| 5182 | } |
| 5183 | return 0; |
| 5184 | } |
| 5185 | |
| 5186 | static void selinux_sem_free_security(struct sem_array *sma) |
| 5187 | { |
| 5188 | ipc_free_security(&sma->sem_perm); |
| 5189 | } |
| 5190 | |
| 5191 | static int selinux_sem_associate(struct sem_array *sma, int semflg) |
| 5192 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5193 | struct ipc_security_struct *isec; |
| 5194 | struct avc_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5195 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5196 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5197 | isec = sma->sem_perm.security; |
| 5198 | |
| 5199 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 5200 | ad.u.ipc_id = sma->sem_perm.key; |
| 5201 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5202 | return avc_has_perm(sid, isec->sid, SECCLASS_SEM, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5203 | SEM__ASSOCIATE, &ad); |
| 5204 | } |
| 5205 | |
| 5206 | /* Note, at this point, sma is locked down */ |
| 5207 | static int selinux_sem_semctl(struct sem_array *sma, int cmd) |
| 5208 | { |
| 5209 | int err; |
| 5210 | u32 perms; |
| 5211 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5212 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5213 | case IPC_INFO: |
| 5214 | case SEM_INFO: |
| 5215 | /* No specific object, just general system-wide information. */ |
| 5216 | return task_has_system(current, SYSTEM__IPC_INFO); |
| 5217 | case GETPID: |
| 5218 | case GETNCNT: |
| 5219 | case GETZCNT: |
| 5220 | perms = SEM__GETATTR; |
| 5221 | break; |
| 5222 | case GETVAL: |
| 5223 | case GETALL: |
| 5224 | perms = SEM__READ; |
| 5225 | break; |
| 5226 | case SETVAL: |
| 5227 | case SETALL: |
| 5228 | perms = SEM__WRITE; |
| 5229 | break; |
| 5230 | case IPC_RMID: |
| 5231 | perms = SEM__DESTROY; |
| 5232 | break; |
| 5233 | case IPC_SET: |
| 5234 | perms = SEM__SETATTR; |
| 5235 | break; |
| 5236 | case IPC_STAT: |
| 5237 | case SEM_STAT: |
| 5238 | perms = SEM__GETATTR | SEM__ASSOCIATE; |
| 5239 | break; |
| 5240 | default: |
| 5241 | return 0; |
| 5242 | } |
| 5243 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 5244 | err = ipc_has_perm(&sma->sem_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5245 | return err; |
| 5246 | } |
| 5247 | |
| 5248 | static int selinux_sem_semop(struct sem_array *sma, |
| 5249 | struct sembuf *sops, unsigned nsops, int alter) |
| 5250 | { |
| 5251 | u32 perms; |
| 5252 | |
| 5253 | if (alter) |
| 5254 | perms = SEM__READ | SEM__WRITE; |
| 5255 | else |
| 5256 | perms = SEM__READ; |
| 5257 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 5258 | return ipc_has_perm(&sma->sem_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5259 | } |
| 5260 | |
| 5261 | static int selinux_ipc_permission(struct kern_ipc_perm *ipcp, short flag) |
| 5262 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5263 | u32 av = 0; |
| 5264 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5265 | av = 0; |
| 5266 | if (flag & S_IRUGO) |
| 5267 | av |= IPC__UNIX_READ; |
| 5268 | if (flag & S_IWUGO) |
| 5269 | av |= IPC__UNIX_WRITE; |
| 5270 | |
| 5271 | if (av == 0) |
| 5272 | return 0; |
| 5273 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 5274 | return ipc_has_perm(ipcp, av); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5275 | } |
| 5276 | |
Ahmed S. Darwish | 713a04a | 2008-03-01 21:52:30 +0200 | [diff] [blame] | 5277 | static void selinux_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid) |
| 5278 | { |
| 5279 | struct ipc_security_struct *isec = ipcp->security; |
| 5280 | *secid = isec->sid; |
| 5281 | } |
| 5282 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5283 | static void selinux_d_instantiate(struct dentry *dentry, struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5284 | { |
| 5285 | if (inode) |
| 5286 | inode_doinit_with_dentry(inode, dentry); |
| 5287 | } |
| 5288 | |
| 5289 | static int selinux_getprocattr(struct task_struct *p, |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 5290 | char *name, char **value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5291 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5292 | const struct task_security_struct *__tsec; |
Dustin Kirkland | 8c8570f | 2005-11-03 17:15:16 +0000 | [diff] [blame] | 5293 | u32 sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5294 | int error; |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 5295 | unsigned len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5296 | |
| 5297 | if (current != p) { |
| 5298 | error = task_has_perm(current, p, PROCESS__GETATTR); |
| 5299 | if (error) |
| 5300 | return error; |
| 5301 | } |
| 5302 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5303 | rcu_read_lock(); |
| 5304 | __tsec = __task_cred(p)->security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5305 | |
| 5306 | if (!strcmp(name, "current")) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5307 | sid = __tsec->sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5308 | else if (!strcmp(name, "prev")) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5309 | sid = __tsec->osid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5310 | else if (!strcmp(name, "exec")) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5311 | sid = __tsec->exec_sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5312 | else if (!strcmp(name, "fscreate")) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5313 | sid = __tsec->create_sid; |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5314 | else if (!strcmp(name, "keycreate")) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5315 | sid = __tsec->keycreate_sid; |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 5316 | else if (!strcmp(name, "sockcreate")) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5317 | sid = __tsec->sockcreate_sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5318 | else |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5319 | goto invalid; |
| 5320 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5321 | |
| 5322 | if (!sid) |
| 5323 | return 0; |
| 5324 | |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 5325 | error = security_sid_to_context(sid, value, &len); |
| 5326 | if (error) |
| 5327 | return error; |
| 5328 | return len; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5329 | |
| 5330 | invalid: |
| 5331 | rcu_read_unlock(); |
| 5332 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5333 | } |
| 5334 | |
| 5335 | static int selinux_setprocattr(struct task_struct *p, |
| 5336 | char *name, void *value, size_t size) |
| 5337 | { |
| 5338 | struct task_security_struct *tsec; |
Roland McGrath | 0356357 | 2008-03-26 15:46:39 -0700 | [diff] [blame] | 5339 | struct task_struct *tracer; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 5340 | struct cred *new; |
| 5341 | u32 sid = 0, ptsid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5342 | int error; |
| 5343 | char *str = value; |
| 5344 | |
| 5345 | if (current != p) { |
| 5346 | /* SELinux only allows a process to change its own |
| 5347 | security attributes. */ |
| 5348 | return -EACCES; |
| 5349 | } |
| 5350 | |
| 5351 | /* |
| 5352 | * Basic control over ability to set these attributes at all. |
| 5353 | * current == p, but we'll pass them separately in case the |
| 5354 | * above restriction is ever removed. |
| 5355 | */ |
| 5356 | if (!strcmp(name, "exec")) |
| 5357 | error = task_has_perm(current, p, PROCESS__SETEXEC); |
| 5358 | else if (!strcmp(name, "fscreate")) |
| 5359 | error = task_has_perm(current, p, PROCESS__SETFSCREATE); |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5360 | else if (!strcmp(name, "keycreate")) |
| 5361 | error = task_has_perm(current, p, PROCESS__SETKEYCREATE); |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 5362 | else if (!strcmp(name, "sockcreate")) |
| 5363 | error = task_has_perm(current, p, PROCESS__SETSOCKCREATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5364 | else if (!strcmp(name, "current")) |
| 5365 | error = task_has_perm(current, p, PROCESS__SETCURRENT); |
| 5366 | else |
| 5367 | error = -EINVAL; |
| 5368 | if (error) |
| 5369 | return error; |
| 5370 | |
| 5371 | /* Obtain a SID for the context, if one was specified. */ |
| 5372 | if (size && str[1] && str[1] != '\n') { |
| 5373 | if (str[size-1] == '\n') { |
| 5374 | str[size-1] = 0; |
| 5375 | size--; |
| 5376 | } |
| 5377 | error = security_context_to_sid(value, size, &sid); |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 5378 | if (error == -EINVAL && !strcmp(name, "fscreate")) { |
| 5379 | if (!capable(CAP_MAC_ADMIN)) |
| 5380 | return error; |
| 5381 | error = security_context_to_sid_force(value, size, |
| 5382 | &sid); |
| 5383 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5384 | if (error) |
| 5385 | return error; |
| 5386 | } |
| 5387 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 5388 | new = prepare_creds(); |
| 5389 | if (!new) |
| 5390 | return -ENOMEM; |
| 5391 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5392 | /* Permission checking based on the specified context is |
| 5393 | performed during the actual operation (execve, |
| 5394 | open/mkdir/...), when we know the full context of the |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 5395 | operation. See selinux_bprm_set_creds for the execve |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5396 | checks and may_create for the file creation checks. The |
| 5397 | operation will then fail if the context is not permitted. */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 5398 | tsec = new->security; |
| 5399 | if (!strcmp(name, "exec")) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5400 | tsec->exec_sid = sid; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 5401 | } else if (!strcmp(name, "fscreate")) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5402 | tsec->create_sid = sid; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 5403 | } else if (!strcmp(name, "keycreate")) { |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5404 | error = may_create_key(sid, p); |
| 5405 | if (error) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 5406 | goto abort_change; |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5407 | tsec->keycreate_sid = sid; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 5408 | } else if (!strcmp(name, "sockcreate")) { |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 5409 | tsec->sockcreate_sid = sid; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 5410 | } else if (!strcmp(name, "current")) { |
| 5411 | error = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5412 | if (sid == 0) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 5413 | goto abort_change; |
KaiGai Kohei | d9250de | 2008-08-28 16:35:57 +0900 | [diff] [blame] | 5414 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 5415 | /* Only allow single threaded processes to change context */ |
| 5416 | error = -EPERM; |
| 5417 | if (!is_single_threaded(p)) { |
| 5418 | error = security_bounded_transition(tsec->sid, sid); |
| 5419 | if (error) |
| 5420 | goto abort_change; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5421 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5422 | |
| 5423 | /* Check permissions for the transition. */ |
| 5424 | error = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5425 | PROCESS__DYNTRANSITION, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5426 | if (error) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 5427 | goto abort_change; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5428 | |
| 5429 | /* Check for ptracing, and update the task SID if ok. |
| 5430 | Otherwise, leave SID unchanged and fail. */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 5431 | ptsid = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5432 | task_lock(p); |
Roland McGrath | 0d094ef | 2008-07-25 19:45:49 -0700 | [diff] [blame] | 5433 | tracer = tracehook_tracer_task(p); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 5434 | if (tracer) |
| 5435 | ptsid = task_sid(tracer); |
| 5436 | task_unlock(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5437 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 5438 | if (tracer) { |
| 5439 | error = avc_has_perm(ptsid, sid, SECCLASS_PROCESS, |
| 5440 | PROCESS__PTRACE, NULL); |
| 5441 | if (error) |
| 5442 | goto abort_change; |
| 5443 | } |
| 5444 | |
| 5445 | tsec->sid = sid; |
| 5446 | } else { |
| 5447 | error = -EINVAL; |
| 5448 | goto abort_change; |
| 5449 | } |
| 5450 | |
| 5451 | commit_creds(new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5452 | return size; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 5453 | |
| 5454 | abort_change: |
| 5455 | abort_creds(new); |
| 5456 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5457 | } |
| 5458 | |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5459 | static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) |
| 5460 | { |
| 5461 | return security_sid_to_context(secid, secdata, seclen); |
| 5462 | } |
| 5463 | |
David Howells | 7bf570d | 2008-04-29 20:52:51 +0100 | [diff] [blame] | 5464 | static int selinux_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
David Howells | 63cb344 | 2008-01-15 23:47:35 +0000 | [diff] [blame] | 5465 | { |
| 5466 | return security_context_to_sid(secdata, seclen, secid); |
| 5467 | } |
| 5468 | |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5469 | static void selinux_release_secctx(char *secdata, u32 seclen) |
| 5470 | { |
Paul Moore | 088999e | 2007-08-01 11:12:58 -0400 | [diff] [blame] | 5471 | kfree(secdata); |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5472 | } |
| 5473 | |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5474 | #ifdef CONFIG_KEYS |
| 5475 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 5476 | static int selinux_key_alloc(struct key *k, const struct cred *cred, |
David Howells | 7e047ef | 2006-06-26 00:24:50 -0700 | [diff] [blame] | 5477 | unsigned long flags) |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5478 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 5479 | const struct task_security_struct *tsec; |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5480 | struct key_security_struct *ksec; |
| 5481 | |
| 5482 | ksec = kzalloc(sizeof(struct key_security_struct), GFP_KERNEL); |
| 5483 | if (!ksec) |
| 5484 | return -ENOMEM; |
| 5485 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 5486 | tsec = cred->security; |
| 5487 | if (tsec->keycreate_sid) |
| 5488 | ksec->sid = tsec->keycreate_sid; |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5489 | else |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 5490 | ksec->sid = tsec->sid; |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5491 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5492 | k->security = ksec; |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5493 | return 0; |
| 5494 | } |
| 5495 | |
| 5496 | static void selinux_key_free(struct key *k) |
| 5497 | { |
| 5498 | struct key_security_struct *ksec = k->security; |
| 5499 | |
| 5500 | k->security = NULL; |
| 5501 | kfree(ksec); |
| 5502 | } |
| 5503 | |
| 5504 | static int selinux_key_permission(key_ref_t key_ref, |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 5505 | const struct cred *cred, |
| 5506 | key_perm_t perm) |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5507 | { |
| 5508 | struct key *key; |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5509 | struct key_security_struct *ksec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5510 | u32 sid; |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5511 | |
| 5512 | /* if no specific permissions are requested, we skip the |
| 5513 | permission check. No serious, additional covert channels |
| 5514 | appear to be created. */ |
| 5515 | if (perm == 0) |
| 5516 | return 0; |
| 5517 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 5518 | sid = cred_sid(cred); |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5519 | |
| 5520 | key = key_ref_to_ptr(key_ref); |
| 5521 | ksec = key->security; |
| 5522 | |
| 5523 | return avc_has_perm(sid, ksec->sid, SECCLASS_KEY, perm, NULL); |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5524 | } |
| 5525 | |
David Howells | 70a5bb7 | 2008-04-29 01:01:26 -0700 | [diff] [blame] | 5526 | static int selinux_key_getsecurity(struct key *key, char **_buffer) |
| 5527 | { |
| 5528 | struct key_security_struct *ksec = key->security; |
| 5529 | char *context = NULL; |
| 5530 | unsigned len; |
| 5531 | int rc; |
| 5532 | |
| 5533 | rc = security_sid_to_context(ksec->sid, &context, &len); |
| 5534 | if (!rc) |
| 5535 | rc = len; |
| 5536 | *_buffer = context; |
| 5537 | return rc; |
| 5538 | } |
| 5539 | |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5540 | #endif |
| 5541 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5542 | static struct security_operations selinux_ops = { |
Ahmed S. Darwish | 076c54c | 2008-03-06 18:09:10 +0200 | [diff] [blame] | 5543 | .name = "selinux", |
| 5544 | |
David Howells | 5cd9c58 | 2008-08-14 11:37:28 +0100 | [diff] [blame] | 5545 | .ptrace_may_access = selinux_ptrace_may_access, |
| 5546 | .ptrace_traceme = selinux_ptrace_traceme, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5547 | .capget = selinux_capget, |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 5548 | .capset = selinux_capset, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5549 | .sysctl = selinux_sysctl, |
| 5550 | .capable = selinux_capable, |
| 5551 | .quotactl = selinux_quotactl, |
| 5552 | .quota_on = selinux_quota_on, |
| 5553 | .syslog = selinux_syslog, |
| 5554 | .vm_enough_memory = selinux_vm_enough_memory, |
| 5555 | |
| 5556 | .netlink_send = selinux_netlink_send, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5557 | .netlink_recv = selinux_netlink_recv, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5558 | |
| 5559 | .bprm_alloc_security = selinux_bprm_alloc_security, |
| 5560 | .bprm_free_security = selinux_bprm_free_security, |
| 5561 | .bprm_apply_creds = selinux_bprm_apply_creds, |
| 5562 | .bprm_post_apply_creds = selinux_bprm_post_apply_creds, |
| 5563 | .bprm_set_security = selinux_bprm_set_security, |
| 5564 | .bprm_check_security = selinux_bprm_check_security, |
| 5565 | .bprm_secureexec = selinux_bprm_secureexec, |
| 5566 | |
| 5567 | .sb_alloc_security = selinux_sb_alloc_security, |
| 5568 | .sb_free_security = selinux_sb_free_security, |
| 5569 | .sb_copy_data = selinux_sb_copy_data, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5570 | .sb_kern_mount = selinux_sb_kern_mount, |
Eric Paris | 2069f45 | 2008-07-04 09:47:13 +1000 | [diff] [blame] | 5571 | .sb_show_options = selinux_sb_show_options, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5572 | .sb_statfs = selinux_sb_statfs, |
| 5573 | .sb_mount = selinux_mount, |
| 5574 | .sb_umount = selinux_umount, |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 5575 | .sb_set_mnt_opts = selinux_set_mnt_opts, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5576 | .sb_clone_mnt_opts = selinux_sb_clone_mnt_opts, |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 5577 | .sb_parse_opts_str = selinux_parse_opts_str, |
| 5578 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5579 | |
| 5580 | .inode_alloc_security = selinux_inode_alloc_security, |
| 5581 | .inode_free_security = selinux_inode_free_security, |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 5582 | .inode_init_security = selinux_inode_init_security, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5583 | .inode_create = selinux_inode_create, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5584 | .inode_link = selinux_inode_link, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5585 | .inode_unlink = selinux_inode_unlink, |
| 5586 | .inode_symlink = selinux_inode_symlink, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5587 | .inode_mkdir = selinux_inode_mkdir, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5588 | .inode_rmdir = selinux_inode_rmdir, |
| 5589 | .inode_mknod = selinux_inode_mknod, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5590 | .inode_rename = selinux_inode_rename, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5591 | .inode_readlink = selinux_inode_readlink, |
| 5592 | .inode_follow_link = selinux_inode_follow_link, |
| 5593 | .inode_permission = selinux_inode_permission, |
| 5594 | .inode_setattr = selinux_inode_setattr, |
| 5595 | .inode_getattr = selinux_inode_getattr, |
| 5596 | .inode_setxattr = selinux_inode_setxattr, |
| 5597 | .inode_post_setxattr = selinux_inode_post_setxattr, |
| 5598 | .inode_getxattr = selinux_inode_getxattr, |
| 5599 | .inode_listxattr = selinux_inode_listxattr, |
| 5600 | .inode_removexattr = selinux_inode_removexattr, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5601 | .inode_getsecurity = selinux_inode_getsecurity, |
| 5602 | .inode_setsecurity = selinux_inode_setsecurity, |
| 5603 | .inode_listsecurity = selinux_inode_listsecurity, |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 5604 | .inode_need_killpriv = selinux_inode_need_killpriv, |
| 5605 | .inode_killpriv = selinux_inode_killpriv, |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 5606 | .inode_getsecid = selinux_inode_getsecid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5607 | |
| 5608 | .file_permission = selinux_file_permission, |
| 5609 | .file_alloc_security = selinux_file_alloc_security, |
| 5610 | .file_free_security = selinux_file_free_security, |
| 5611 | .file_ioctl = selinux_file_ioctl, |
| 5612 | .file_mmap = selinux_file_mmap, |
| 5613 | .file_mprotect = selinux_file_mprotect, |
| 5614 | .file_lock = selinux_file_lock, |
| 5615 | .file_fcntl = selinux_file_fcntl, |
| 5616 | .file_set_fowner = selinux_file_set_fowner, |
| 5617 | .file_send_sigiotask = selinux_file_send_sigiotask, |
| 5618 | .file_receive = selinux_file_receive, |
| 5619 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5620 | .dentry_open = selinux_dentry_open, |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 5621 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5622 | .task_create = selinux_task_create, |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 5623 | .cred_free = selinux_cred_free, |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 5624 | .cred_prepare = selinux_cred_prepare, |
| 5625 | .cred_commit = selinux_cred_commit, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5626 | .task_setuid = selinux_task_setuid, |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 5627 | .task_fix_setuid = selinux_task_fix_setuid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5628 | .task_setgid = selinux_task_setgid, |
| 5629 | .task_setpgid = selinux_task_setpgid, |
| 5630 | .task_getpgid = selinux_task_getpgid, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5631 | .task_getsid = selinux_task_getsid, |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 5632 | .task_getsecid = selinux_task_getsecid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5633 | .task_setgroups = selinux_task_setgroups, |
| 5634 | .task_setnice = selinux_task_setnice, |
James Morris | 03e6806 | 2006-06-23 02:03:58 -0700 | [diff] [blame] | 5635 | .task_setioprio = selinux_task_setioprio, |
David Quigley | a1836a4 | 2006-06-30 01:55:49 -0700 | [diff] [blame] | 5636 | .task_getioprio = selinux_task_getioprio, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5637 | .task_setrlimit = selinux_task_setrlimit, |
| 5638 | .task_setscheduler = selinux_task_setscheduler, |
| 5639 | .task_getscheduler = selinux_task_getscheduler, |
David Quigley | 3560154 | 2006-06-23 02:04:01 -0700 | [diff] [blame] | 5640 | .task_movememory = selinux_task_movememory, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5641 | .task_kill = selinux_task_kill, |
| 5642 | .task_wait = selinux_task_wait, |
| 5643 | .task_prctl = selinux_task_prctl, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5644 | .task_to_inode = selinux_task_to_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5645 | |
| 5646 | .ipc_permission = selinux_ipc_permission, |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 5647 | .ipc_getsecid = selinux_ipc_getsecid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5648 | |
| 5649 | .msg_msg_alloc_security = selinux_msg_msg_alloc_security, |
| 5650 | .msg_msg_free_security = selinux_msg_msg_free_security, |
| 5651 | |
| 5652 | .msg_queue_alloc_security = selinux_msg_queue_alloc_security, |
| 5653 | .msg_queue_free_security = selinux_msg_queue_free_security, |
| 5654 | .msg_queue_associate = selinux_msg_queue_associate, |
| 5655 | .msg_queue_msgctl = selinux_msg_queue_msgctl, |
| 5656 | .msg_queue_msgsnd = selinux_msg_queue_msgsnd, |
| 5657 | .msg_queue_msgrcv = selinux_msg_queue_msgrcv, |
| 5658 | |
| 5659 | .shm_alloc_security = selinux_shm_alloc_security, |
| 5660 | .shm_free_security = selinux_shm_free_security, |
| 5661 | .shm_associate = selinux_shm_associate, |
| 5662 | .shm_shmctl = selinux_shm_shmctl, |
| 5663 | .shm_shmat = selinux_shm_shmat, |
| 5664 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5665 | .sem_alloc_security = selinux_sem_alloc_security, |
| 5666 | .sem_free_security = selinux_sem_free_security, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5667 | .sem_associate = selinux_sem_associate, |
| 5668 | .sem_semctl = selinux_sem_semctl, |
| 5669 | .sem_semop = selinux_sem_semop, |
| 5670 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5671 | .d_instantiate = selinux_d_instantiate, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5672 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5673 | .getprocattr = selinux_getprocattr, |
| 5674 | .setprocattr = selinux_setprocattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5675 | |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5676 | .secid_to_secctx = selinux_secid_to_secctx, |
David Howells | 63cb344 | 2008-01-15 23:47:35 +0000 | [diff] [blame] | 5677 | .secctx_to_secid = selinux_secctx_to_secid, |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5678 | .release_secctx = selinux_release_secctx, |
| 5679 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5680 | .unix_stream_connect = selinux_socket_unix_stream_connect, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5681 | .unix_may_send = selinux_socket_unix_may_send, |
| 5682 | |
| 5683 | .socket_create = selinux_socket_create, |
| 5684 | .socket_post_create = selinux_socket_post_create, |
| 5685 | .socket_bind = selinux_socket_bind, |
| 5686 | .socket_connect = selinux_socket_connect, |
| 5687 | .socket_listen = selinux_socket_listen, |
| 5688 | .socket_accept = selinux_socket_accept, |
| 5689 | .socket_sendmsg = selinux_socket_sendmsg, |
| 5690 | .socket_recvmsg = selinux_socket_recvmsg, |
| 5691 | .socket_getsockname = selinux_socket_getsockname, |
| 5692 | .socket_getpeername = selinux_socket_getpeername, |
| 5693 | .socket_getsockopt = selinux_socket_getsockopt, |
| 5694 | .socket_setsockopt = selinux_socket_setsockopt, |
| 5695 | .socket_shutdown = selinux_socket_shutdown, |
| 5696 | .socket_sock_rcv_skb = selinux_socket_sock_rcv_skb, |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 5697 | .socket_getpeersec_stream = selinux_socket_getpeersec_stream, |
| 5698 | .socket_getpeersec_dgram = selinux_socket_getpeersec_dgram, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5699 | .sk_alloc_security = selinux_sk_alloc_security, |
| 5700 | .sk_free_security = selinux_sk_free_security, |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 5701 | .sk_clone_security = selinux_sk_clone_security, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5702 | .sk_getsecid = selinux_sk_getsecid, |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 5703 | .sock_graft = selinux_sock_graft, |
| 5704 | .inet_conn_request = selinux_inet_conn_request, |
| 5705 | .inet_csk_clone = selinux_inet_csk_clone, |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 5706 | .inet_conn_established = selinux_inet_conn_established, |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 5707 | .req_classify_flow = selinux_req_classify_flow, |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 5708 | |
| 5709 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
| 5710 | .xfrm_policy_alloc_security = selinux_xfrm_policy_alloc, |
| 5711 | .xfrm_policy_clone_security = selinux_xfrm_policy_clone, |
| 5712 | .xfrm_policy_free_security = selinux_xfrm_policy_free, |
Catherine Zhang | c8c05a8 | 2006-06-08 23:39:49 -0700 | [diff] [blame] | 5713 | .xfrm_policy_delete_security = selinux_xfrm_policy_delete, |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 5714 | .xfrm_state_alloc_security = selinux_xfrm_state_alloc, |
| 5715 | .xfrm_state_free_security = selinux_xfrm_state_free, |
Catherine Zhang | c8c05a8 | 2006-06-08 23:39:49 -0700 | [diff] [blame] | 5716 | .xfrm_state_delete_security = selinux_xfrm_state_delete, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5717 | .xfrm_policy_lookup = selinux_xfrm_policy_lookup, |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 5718 | .xfrm_state_pol_flow_match = selinux_xfrm_state_pol_flow_match, |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 5719 | .xfrm_decode_session = selinux_xfrm_decode_session, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5720 | #endif |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5721 | |
| 5722 | #ifdef CONFIG_KEYS |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5723 | .key_alloc = selinux_key_alloc, |
| 5724 | .key_free = selinux_key_free, |
| 5725 | .key_permission = selinux_key_permission, |
David Howells | 70a5bb7 | 2008-04-29 01:01:26 -0700 | [diff] [blame] | 5726 | .key_getsecurity = selinux_key_getsecurity, |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5727 | #endif |
Ahmed S. Darwish | 9d57a7f | 2008-03-01 22:03:14 +0200 | [diff] [blame] | 5728 | |
| 5729 | #ifdef CONFIG_AUDIT |
| 5730 | .audit_rule_init = selinux_audit_rule_init, |
| 5731 | .audit_rule_known = selinux_audit_rule_known, |
| 5732 | .audit_rule_match = selinux_audit_rule_match, |
| 5733 | .audit_rule_free = selinux_audit_rule_free, |
| 5734 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5735 | }; |
| 5736 | |
| 5737 | static __init int selinux_init(void) |
| 5738 | { |
Ahmed S. Darwish | 076c54c | 2008-03-06 18:09:10 +0200 | [diff] [blame] | 5739 | if (!security_module_enable(&selinux_ops)) { |
| 5740 | selinux_enabled = 0; |
| 5741 | return 0; |
| 5742 | } |
| 5743 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5744 | if (!selinux_enabled) { |
| 5745 | printk(KERN_INFO "SELinux: Disabled at boot.\n"); |
| 5746 | return 0; |
| 5747 | } |
| 5748 | |
| 5749 | printk(KERN_INFO "SELinux: Initializing.\n"); |
| 5750 | |
| 5751 | /* Set the security state for the initial task. */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame^] | 5752 | cred_init_security(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5753 | |
James Morris | 7cae7e2 | 2006-03-22 00:09:22 -0800 | [diff] [blame] | 5754 | sel_inode_cache = kmem_cache_create("selinux_inode_security", |
| 5755 | sizeof(struct inode_security_struct), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 5756 | 0, SLAB_PANIC, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5757 | avc_init(); |
| 5758 | |
James Morris | 6f0f0fd | 2008-07-10 17:02:07 +0900 | [diff] [blame] | 5759 | secondary_ops = security_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5760 | if (!secondary_ops) |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5761 | panic("SELinux: No initial security operations\n"); |
| 5762 | if (register_security(&selinux_ops)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5763 | panic("SELinux: Unable to register with kernel.\n"); |
| 5764 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5765 | if (selinux_enforcing) |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5766 | printk(KERN_DEBUG "SELinux: Starting in enforcing mode\n"); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5767 | else |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5768 | printk(KERN_DEBUG "SELinux: Starting in permissive mode\n"); |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5769 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5770 | return 0; |
| 5771 | } |
| 5772 | |
| 5773 | void selinux_complete_init(void) |
| 5774 | { |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5775 | printk(KERN_DEBUG "SELinux: Completing initialization.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5776 | |
| 5777 | /* Set up any superblocks initialized prior to the policy load. */ |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5778 | printk(KERN_DEBUG "SELinux: Setting up existing superblocks.\n"); |
Stephen Smalley | ba0c19e | 2006-06-04 02:51:30 -0700 | [diff] [blame] | 5779 | spin_lock(&sb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5780 | spin_lock(&sb_security_lock); |
| 5781 | next_sb: |
| 5782 | if (!list_empty(&superblock_security_head)) { |
| 5783 | struct superblock_security_struct *sbsec = |
| 5784 | list_entry(superblock_security_head.next, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5785 | struct superblock_security_struct, |
| 5786 | list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5787 | struct super_block *sb = sbsec->sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5788 | sb->s_count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5789 | spin_unlock(&sb_security_lock); |
Stephen Smalley | ba0c19e | 2006-06-04 02:51:30 -0700 | [diff] [blame] | 5790 | spin_unlock(&sb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5791 | down_read(&sb->s_umount); |
| 5792 | if (sb->s_root) |
| 5793 | superblock_doinit(sb, NULL); |
| 5794 | drop_super(sb); |
Stephen Smalley | ba0c19e | 2006-06-04 02:51:30 -0700 | [diff] [blame] | 5795 | spin_lock(&sb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5796 | spin_lock(&sb_security_lock); |
| 5797 | list_del_init(&sbsec->list); |
| 5798 | goto next_sb; |
| 5799 | } |
| 5800 | spin_unlock(&sb_security_lock); |
Stephen Smalley | ba0c19e | 2006-06-04 02:51:30 -0700 | [diff] [blame] | 5801 | spin_unlock(&sb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5802 | } |
| 5803 | |
| 5804 | /* SELinux requires early initialization in order to label |
| 5805 | all processes and objects when they are created. */ |
| 5806 | security_initcall(selinux_init); |
| 5807 | |
Stephen Smalley | c2b507f | 2006-02-04 23:27:50 -0800 | [diff] [blame] | 5808 | #if defined(CONFIG_NETFILTER) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5809 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5810 | static struct nf_hook_ops selinux_ipv4_ops[] = { |
| 5811 | { |
| 5812 | .hook = selinux_ipv4_postroute, |
| 5813 | .owner = THIS_MODULE, |
| 5814 | .pf = PF_INET, |
| 5815 | .hooknum = NF_INET_POST_ROUTING, |
| 5816 | .priority = NF_IP_PRI_SELINUX_LAST, |
| 5817 | }, |
| 5818 | { |
| 5819 | .hook = selinux_ipv4_forward, |
| 5820 | .owner = THIS_MODULE, |
| 5821 | .pf = PF_INET, |
| 5822 | .hooknum = NF_INET_FORWARD, |
| 5823 | .priority = NF_IP_PRI_SELINUX_FIRST, |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 5824 | }, |
| 5825 | { |
| 5826 | .hook = selinux_ipv4_output, |
| 5827 | .owner = THIS_MODULE, |
| 5828 | .pf = PF_INET, |
| 5829 | .hooknum = NF_INET_LOCAL_OUT, |
| 5830 | .priority = NF_IP_PRI_SELINUX_FIRST, |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5831 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5832 | }; |
| 5833 | |
| 5834 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 5835 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5836 | static struct nf_hook_ops selinux_ipv6_ops[] = { |
| 5837 | { |
| 5838 | .hook = selinux_ipv6_postroute, |
| 5839 | .owner = THIS_MODULE, |
| 5840 | .pf = PF_INET6, |
| 5841 | .hooknum = NF_INET_POST_ROUTING, |
| 5842 | .priority = NF_IP6_PRI_SELINUX_LAST, |
| 5843 | }, |
| 5844 | { |
| 5845 | .hook = selinux_ipv6_forward, |
| 5846 | .owner = THIS_MODULE, |
| 5847 | .pf = PF_INET6, |
| 5848 | .hooknum = NF_INET_FORWARD, |
| 5849 | .priority = NF_IP6_PRI_SELINUX_FIRST, |
| 5850 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5851 | }; |
| 5852 | |
| 5853 | #endif /* IPV6 */ |
| 5854 | |
| 5855 | static int __init selinux_nf_ip_init(void) |
| 5856 | { |
| 5857 | int err = 0; |
| 5858 | |
| 5859 | if (!selinux_enabled) |
| 5860 | goto out; |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5861 | |
| 5862 | printk(KERN_DEBUG "SELinux: Registering netfilter hooks\n"); |
| 5863 | |
Alexey Dobriyan | 6c5a9d2 | 2008-07-26 17:48:15 -0700 | [diff] [blame] | 5864 | err = nf_register_hooks(selinux_ipv4_ops, ARRAY_SIZE(selinux_ipv4_ops)); |
| 5865 | if (err) |
| 5866 | panic("SELinux: nf_register_hooks for IPv4: error %d\n", err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5867 | |
| 5868 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
Alexey Dobriyan | 6c5a9d2 | 2008-07-26 17:48:15 -0700 | [diff] [blame] | 5869 | err = nf_register_hooks(selinux_ipv6_ops, ARRAY_SIZE(selinux_ipv6_ops)); |
| 5870 | if (err) |
| 5871 | panic("SELinux: nf_register_hooks for IPv6: error %d\n", err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5872 | #endif /* IPV6 */ |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 5873 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5874 | out: |
| 5875 | return err; |
| 5876 | } |
| 5877 | |
| 5878 | __initcall(selinux_nf_ip_init); |
| 5879 | |
| 5880 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
| 5881 | static void selinux_nf_ip_exit(void) |
| 5882 | { |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5883 | printk(KERN_DEBUG "SELinux: Unregistering netfilter hooks\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5884 | |
Alexey Dobriyan | 6c5a9d2 | 2008-07-26 17:48:15 -0700 | [diff] [blame] | 5885 | nf_unregister_hooks(selinux_ipv4_ops, ARRAY_SIZE(selinux_ipv4_ops)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5886 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
Alexey Dobriyan | 6c5a9d2 | 2008-07-26 17:48:15 -0700 | [diff] [blame] | 5887 | nf_unregister_hooks(selinux_ipv6_ops, ARRAY_SIZE(selinux_ipv6_ops)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5888 | #endif /* IPV6 */ |
| 5889 | } |
| 5890 | #endif |
| 5891 | |
Stephen Smalley | c2b507f | 2006-02-04 23:27:50 -0800 | [diff] [blame] | 5892 | #else /* CONFIG_NETFILTER */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5893 | |
| 5894 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
| 5895 | #define selinux_nf_ip_exit() |
| 5896 | #endif |
| 5897 | |
Stephen Smalley | c2b507f | 2006-02-04 23:27:50 -0800 | [diff] [blame] | 5898 | #endif /* CONFIG_NETFILTER */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5899 | |
| 5900 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5901 | static int selinux_disabled; |
| 5902 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5903 | int selinux_disable(void) |
| 5904 | { |
| 5905 | extern void exit_sel_fs(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5906 | |
| 5907 | if (ss_initialized) { |
| 5908 | /* Not permitted after initial policy load. */ |
| 5909 | return -EINVAL; |
| 5910 | } |
| 5911 | |
| 5912 | if (selinux_disabled) { |
| 5913 | /* Only do this once. */ |
| 5914 | return -EINVAL; |
| 5915 | } |
| 5916 | |
| 5917 | printk(KERN_INFO "SELinux: Disabled at runtime.\n"); |
| 5918 | |
| 5919 | selinux_disabled = 1; |
Stephen Smalley | 30d5528 | 2006-05-03 10:52:36 -0400 | [diff] [blame] | 5920 | selinux_enabled = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5921 | |
| 5922 | /* Reset security_ops to the secondary module, dummy or capability. */ |
| 5923 | security_ops = secondary_ops; |
| 5924 | |
| 5925 | /* Unregister netfilter hooks. */ |
| 5926 | selinux_nf_ip_exit(); |
| 5927 | |
| 5928 | /* Unregister selinuxfs. */ |
| 5929 | exit_sel_fs(); |
| 5930 | |
| 5931 | return 0; |
| 5932 | } |
| 5933 | #endif |