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. |
| 12 | * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com> |
| 13 | * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc. |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 14 | * <dgoeddel@trustedcs.com> |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 15 | * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P. |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 16 | * Paul Moore <paul.moore@hp.com> |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 17 | * Copyright (C) 2007 Hitachi Software Engineering Co., Ltd. |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 18 | * Yuichi Nakamura <ynakam@hitachisoft.jp> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | * |
| 20 | * This program is free software; you can redistribute it and/or modify |
| 21 | * it under the terms of the GNU General Public License version 2, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 22 | * as published by the Free Software Foundation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | */ |
| 24 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/init.h> |
| 26 | #include <linux/kernel.h> |
| 27 | #include <linux/ptrace.h> |
| 28 | #include <linux/errno.h> |
| 29 | #include <linux/sched.h> |
| 30 | #include <linux/security.h> |
| 31 | #include <linux/xattr.h> |
| 32 | #include <linux/capability.h> |
| 33 | #include <linux/unistd.h> |
| 34 | #include <linux/mm.h> |
| 35 | #include <linux/mman.h> |
| 36 | #include <linux/slab.h> |
| 37 | #include <linux/pagemap.h> |
| 38 | #include <linux/swap.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include <linux/spinlock.h> |
| 40 | #include <linux/syscalls.h> |
| 41 | #include <linux/file.h> |
Al Viro | 9f3acc3 | 2008-04-24 07:44:08 -0400 | [diff] [blame] | 42 | #include <linux/fdtable.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include <linux/namei.h> |
| 44 | #include <linux/mount.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #include <linux/proc_fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | #include <linux/netfilter_ipv4.h> |
| 47 | #include <linux/netfilter_ipv6.h> |
| 48 | #include <linux/tty.h> |
| 49 | #include <net/icmp.h> |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 50 | #include <net/ip.h> /* for local_port_range[] */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #include <net/tcp.h> /* struct or_callable used in sock_rcv_skb */ |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 52 | #include <net/net_namespace.h> |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 53 | #include <net/netlabel.h> |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 54 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | #include <asm/ioctls.h> |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 56 | #include <asm/atomic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | #include <linux/bitops.h> |
| 58 | #include <linux/interrupt.h> |
| 59 | #include <linux/netdevice.h> /* for network interface checks */ |
| 60 | #include <linux/netlink.h> |
| 61 | #include <linux/tcp.h> |
| 62 | #include <linux/udp.h> |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 63 | #include <linux/dccp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | #include <linux/quota.h> |
| 65 | #include <linux/un.h> /* for Unix socket types */ |
| 66 | #include <net/af_unix.h> /* for Unix socket types */ |
| 67 | #include <linux/parser.h> |
| 68 | #include <linux/nfs_mount.h> |
| 69 | #include <net/ipv6.h> |
| 70 | #include <linux/hugetlb.h> |
| 71 | #include <linux/personality.h> |
| 72 | #include <linux/sysctl.h> |
| 73 | #include <linux/audit.h> |
Eric Paris | 6931dfc | 2005-06-30 02:58:51 -0700 | [diff] [blame] | 74 | #include <linux/string.h> |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 75 | #include <linux/selinux.h> |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 76 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
| 78 | #include "avc.h" |
| 79 | #include "objsec.h" |
| 80 | #include "netif.h" |
Paul Moore | 224dfbd | 2008-01-29 08:38:13 -0500 | [diff] [blame] | 81 | #include "netnode.h" |
Paul Moore | 3e11217 | 2008-04-10 10:48:14 -0400 | [diff] [blame] | 82 | #include "netport.h" |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 83 | #include "xfrm.h" |
Paul Moore | c60475b | 2007-02-28 15:14:23 -0500 | [diff] [blame] | 84 | #include "netlabel.h" |
Ahmed S. Darwish | 9d57a7f | 2008-03-01 22:03:14 +0200 | [diff] [blame] | 85 | #include "audit.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | |
| 87 | #define XATTR_SELINUX_SUFFIX "selinux" |
| 88 | #define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX |
| 89 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 90 | #define NUM_SEL_MNT_OPTS 4 |
| 91 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | extern unsigned int policydb_loaded_version; |
| 93 | extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm); |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 94 | extern int selinux_compat_net; |
James Morris | 20510f2 | 2007-10-16 23:31:32 -0700 | [diff] [blame] | 95 | extern struct security_operations *security_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 97 | /* SECMARK reference count */ |
| 98 | atomic_t selinux_secmark_refcount = ATOMIC_INIT(0); |
| 99 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 101 | int selinux_enforcing; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
| 103 | static int __init enforcing_setup(char *str) |
| 104 | { |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 105 | unsigned long enforcing; |
| 106 | if (!strict_strtoul(str, 0, &enforcing)) |
| 107 | selinux_enforcing = enforcing ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | return 1; |
| 109 | } |
| 110 | __setup("enforcing=", enforcing_setup); |
| 111 | #endif |
| 112 | |
| 113 | #ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM |
| 114 | int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE; |
| 115 | |
| 116 | static int __init selinux_enabled_setup(char *str) |
| 117 | { |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 118 | unsigned long enabled; |
| 119 | if (!strict_strtoul(str, 0, &enabled)) |
| 120 | selinux_enabled = enabled ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | return 1; |
| 122 | } |
| 123 | __setup("selinux=", selinux_enabled_setup); |
Stephen Smalley | 30d5528 | 2006-05-03 10:52:36 -0400 | [diff] [blame] | 124 | #else |
| 125 | int selinux_enabled = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | #endif |
| 127 | |
| 128 | /* Original (dummy) security module. */ |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 129 | static struct security_operations *original_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
| 131 | /* Minimal support for a secondary security module, |
| 132 | just to allow the use of the dummy or capability modules. |
| 133 | The owlsm module can alternatively be used as a secondary |
| 134 | module as long as CONFIG_OWLSM_FD is not enabled. */ |
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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | /* Allocate and free functions for each kind of security blob. */ |
| 160 | |
| 161 | static int task_alloc_security(struct task_struct *task) |
| 162 | { |
| 163 | struct task_security_struct *tsec; |
| 164 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 165 | tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | if (!tsec) |
| 167 | return -ENOMEM; |
| 168 | |
Roland McGrath | 0356357 | 2008-03-26 15:46:39 -0700 | [diff] [blame] | 169 | tsec->osid = tsec->sid = SECINITSID_UNLABELED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | task->security = tsec; |
| 171 | |
| 172 | return 0; |
| 173 | } |
| 174 | |
| 175 | static void task_free_security(struct task_struct *task) |
| 176 | { |
| 177 | struct task_security_struct *tsec = task->security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | task->security = NULL; |
| 179 | kfree(tsec); |
| 180 | } |
| 181 | |
| 182 | static int inode_alloc_security(struct inode *inode) |
| 183 | { |
| 184 | struct task_security_struct *tsec = current->security; |
| 185 | struct inode_security_struct *isec; |
| 186 | |
Josef Bacik | a02fe13 | 2008-04-04 09:35:05 +1100 | [diff] [blame] | 187 | isec = kmem_cache_zalloc(sel_inode_cache, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | if (!isec) |
| 189 | return -ENOMEM; |
| 190 | |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 191 | mutex_init(&isec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | INIT_LIST_HEAD(&isec->list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | isec->inode = inode; |
| 194 | isec->sid = SECINITSID_UNLABELED; |
| 195 | isec->sclass = SECCLASS_FILE; |
Stephen Smalley | 9ac49d2 | 2006-02-01 03:05:56 -0800 | [diff] [blame] | 196 | isec->task_sid = tsec->sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | inode->i_security = isec; |
| 198 | |
| 199 | return 0; |
| 200 | } |
| 201 | |
| 202 | static void inode_free_security(struct inode *inode) |
| 203 | { |
| 204 | struct inode_security_struct *isec = inode->i_security; |
| 205 | struct superblock_security_struct *sbsec = inode->i_sb->s_security; |
| 206 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | spin_lock(&sbsec->isec_lock); |
| 208 | if (!list_empty(&isec->list)) |
| 209 | list_del_init(&isec->list); |
| 210 | spin_unlock(&sbsec->isec_lock); |
| 211 | |
| 212 | inode->i_security = NULL; |
James Morris | 7cae7e2 | 2006-03-22 00:09:22 -0800 | [diff] [blame] | 213 | kmem_cache_free(sel_inode_cache, isec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | } |
| 215 | |
| 216 | static int file_alloc_security(struct file *file) |
| 217 | { |
| 218 | struct task_security_struct *tsec = current->security; |
| 219 | struct file_security_struct *fsec; |
| 220 | |
Stephen Smalley | 26d2a4b | 2006-02-01 03:05:55 -0800 | [diff] [blame] | 221 | fsec = kzalloc(sizeof(struct file_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | if (!fsec) |
| 223 | return -ENOMEM; |
| 224 | |
Stephen Smalley | 9ac49d2 | 2006-02-01 03:05:56 -0800 | [diff] [blame] | 225 | fsec->sid = tsec->sid; |
| 226 | fsec->fown_sid = tsec->sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | file->f_security = fsec; |
| 228 | |
| 229 | return 0; |
| 230 | } |
| 231 | |
| 232 | static void file_free_security(struct file *file) |
| 233 | { |
| 234 | struct file_security_struct *fsec = file->f_security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | file->f_security = NULL; |
| 236 | kfree(fsec); |
| 237 | } |
| 238 | |
| 239 | static int superblock_alloc_security(struct super_block *sb) |
| 240 | { |
| 241 | struct superblock_security_struct *sbsec; |
| 242 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 243 | sbsec = kzalloc(sizeof(struct superblock_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | if (!sbsec) |
| 245 | return -ENOMEM; |
| 246 | |
Eric Paris | bc7e982 | 2006-09-25 23:32:02 -0700 | [diff] [blame] | 247 | mutex_init(&sbsec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | INIT_LIST_HEAD(&sbsec->list); |
| 249 | INIT_LIST_HEAD(&sbsec->isec_head); |
| 250 | spin_lock_init(&sbsec->isec_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | sbsec->sb = sb; |
| 252 | sbsec->sid = SECINITSID_UNLABELED; |
| 253 | sbsec->def_sid = SECINITSID_FILE; |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 254 | sbsec->mntpoint_sid = SECINITSID_UNLABELED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | sb->s_security = sbsec; |
| 256 | |
| 257 | return 0; |
| 258 | } |
| 259 | |
| 260 | static void superblock_free_security(struct super_block *sb) |
| 261 | { |
| 262 | struct superblock_security_struct *sbsec = sb->s_security; |
| 263 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | spin_lock(&sb_security_lock); |
| 265 | if (!list_empty(&sbsec->list)) |
| 266 | list_del_init(&sbsec->list); |
| 267 | spin_unlock(&sb_security_lock); |
| 268 | |
| 269 | sb->s_security = NULL; |
| 270 | kfree(sbsec); |
| 271 | } |
| 272 | |
Al Viro | 7d877f3 | 2005-10-21 03:20:43 -0400 | [diff] [blame] | 273 | 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] | 274 | { |
| 275 | struct sk_security_struct *ssec; |
| 276 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 277 | ssec = kzalloc(sizeof(*ssec), priority); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | if (!ssec) |
| 279 | return -ENOMEM; |
| 280 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | ssec->peer_sid = SECINITSID_UNLABELED; |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 282 | ssec->sid = SECINITSID_UNLABELED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | sk->sk_security = ssec; |
| 284 | |
Paul Moore | f74af6e | 2008-02-25 11:40:33 -0500 | [diff] [blame] | 285 | selinux_netlbl_sk_security_reset(ssec, family); |
Paul Moore | 99f59ed | 2006-08-29 17:53:48 -0700 | [diff] [blame] | 286 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | return 0; |
| 288 | } |
| 289 | |
| 290 | static void sk_free_security(struct sock *sk) |
| 291 | { |
| 292 | struct sk_security_struct *ssec = sk->sk_security; |
| 293 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | sk->sk_security = NULL; |
| 295 | kfree(ssec); |
| 296 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | |
| 298 | /* The security server must be initialized before |
| 299 | any labeling or access decisions can be provided. */ |
| 300 | extern int ss_initialized; |
| 301 | |
| 302 | /* The file system's label must be initialized prior to use. */ |
| 303 | |
| 304 | static char *labeling_behaviors[6] = { |
| 305 | "uses xattr", |
| 306 | "uses transition SIDs", |
| 307 | "uses task SIDs", |
| 308 | "uses genfs_contexts", |
| 309 | "not configured for labeling", |
| 310 | "uses mountpoint labeling", |
| 311 | }; |
| 312 | |
| 313 | static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry); |
| 314 | |
| 315 | static inline int inode_doinit(struct inode *inode) |
| 316 | { |
| 317 | return inode_doinit_with_dentry(inode, NULL); |
| 318 | } |
| 319 | |
| 320 | enum { |
Eric Paris | 31e8793 | 2007-09-19 17:19:12 -0400 | [diff] [blame] | 321 | Opt_error = -1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | Opt_context = 1, |
| 323 | Opt_fscontext = 2, |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 324 | Opt_defcontext = 3, |
| 325 | Opt_rootcontext = 4, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | }; |
| 327 | |
| 328 | static match_table_t tokens = { |
Eric Paris | 832cbd9 | 2008-04-01 13:24:09 -0400 | [diff] [blame] | 329 | {Opt_context, CONTEXT_STR "%s"}, |
| 330 | {Opt_fscontext, FSCONTEXT_STR "%s"}, |
| 331 | {Opt_defcontext, DEFCONTEXT_STR "%s"}, |
| 332 | {Opt_rootcontext, ROOTCONTEXT_STR "%s"}, |
Eric Paris | 31e8793 | 2007-09-19 17:19:12 -0400 | [diff] [blame] | 333 | {Opt_error, NULL}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | }; |
| 335 | |
| 336 | #define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n" |
| 337 | |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 338 | static int may_context_mount_sb_relabel(u32 sid, |
| 339 | struct superblock_security_struct *sbsec, |
| 340 | struct task_security_struct *tsec) |
| 341 | { |
| 342 | int rc; |
| 343 | |
| 344 | rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, |
| 345 | FILESYSTEM__RELABELFROM, NULL); |
| 346 | if (rc) |
| 347 | return rc; |
| 348 | |
| 349 | rc = avc_has_perm(tsec->sid, sid, SECCLASS_FILESYSTEM, |
| 350 | FILESYSTEM__RELABELTO, NULL); |
| 351 | return rc; |
| 352 | } |
| 353 | |
Eric Paris | 0808925 | 2006-07-10 04:43:55 -0700 | [diff] [blame] | 354 | static int may_context_mount_inode_relabel(u32 sid, |
| 355 | struct superblock_security_struct *sbsec, |
| 356 | struct task_security_struct *tsec) |
| 357 | { |
| 358 | int rc; |
| 359 | rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, |
| 360 | FILESYSTEM__RELABELFROM, NULL); |
| 361 | if (rc) |
| 362 | return rc; |
| 363 | |
| 364 | rc = avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, |
| 365 | FILESYSTEM__ASSOCIATE, NULL); |
| 366 | return rc; |
| 367 | } |
| 368 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 369 | static int sb_finish_set_opts(struct super_block *sb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | { |
| 371 | struct superblock_security_struct *sbsec = sb->s_security; |
| 372 | struct dentry *root = sb->s_root; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 373 | struct inode *root_inode = root->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | int rc = 0; |
| 375 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | if (sbsec->behavior == SECURITY_FS_USE_XATTR) { |
| 377 | /* Make sure that the xattr handler exists and that no |
| 378 | error other than -ENODATA is returned by getxattr on |
| 379 | the root directory. -ENODATA is ok, as this may be |
| 380 | the first boot of the SELinux kernel before we have |
| 381 | assigned xattr values to the filesystem. */ |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 382 | if (!root_inode->i_op->getxattr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | printk(KERN_WARNING "SELinux: (dev %s, type %s) has no " |
| 384 | "xattr support\n", sb->s_id, sb->s_type->name); |
| 385 | rc = -EOPNOTSUPP; |
| 386 | goto out; |
| 387 | } |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 388 | rc = root_inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | if (rc < 0 && rc != -ENODATA) { |
| 390 | if (rc == -EOPNOTSUPP) |
| 391 | printk(KERN_WARNING "SELinux: (dev %s, type " |
| 392 | "%s) has no security xattr handler\n", |
| 393 | sb->s_id, sb->s_type->name); |
| 394 | else |
| 395 | printk(KERN_WARNING "SELinux: (dev %s, type " |
| 396 | "%s) getxattr errno %d\n", sb->s_id, |
| 397 | sb->s_type->name, -rc); |
| 398 | goto out; |
| 399 | } |
| 400 | } |
| 401 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | sbsec->initialized = 1; |
| 403 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 404 | if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors)) |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 405 | printk(KERN_ERR "SELinux: initialized (dev %s, type %s), unknown behavior\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | sb->s_id, sb->s_type->name); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 407 | else |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 408 | printk(KERN_DEBUG "SELinux: initialized (dev %s, type %s), %s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | sb->s_id, sb->s_type->name, |
| 410 | labeling_behaviors[sbsec->behavior-1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
| 412 | /* Initialize the root inode. */ |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 413 | rc = inode_doinit_with_dentry(root_inode, root); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | |
| 415 | /* Initialize any other inodes associated with the superblock, e.g. |
| 416 | inodes created prior to initial policy load or inodes created |
| 417 | during get_sb by a pseudo filesystem that directly |
| 418 | populates itself. */ |
| 419 | spin_lock(&sbsec->isec_lock); |
| 420 | next_inode: |
| 421 | if (!list_empty(&sbsec->isec_head)) { |
| 422 | struct inode_security_struct *isec = |
| 423 | list_entry(sbsec->isec_head.next, |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 424 | struct inode_security_struct, list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | struct inode *inode = isec->inode; |
| 426 | spin_unlock(&sbsec->isec_lock); |
| 427 | inode = igrab(inode); |
| 428 | if (inode) { |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 429 | if (!IS_PRIVATE(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | inode_doinit(inode); |
| 431 | iput(inode); |
| 432 | } |
| 433 | spin_lock(&sbsec->isec_lock); |
| 434 | list_del_init(&isec->list); |
| 435 | goto next_inode; |
| 436 | } |
| 437 | spin_unlock(&sbsec->isec_lock); |
| 438 | out: |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 439 | return rc; |
| 440 | } |
| 441 | |
| 442 | /* |
| 443 | * This function should allow an FS to ask what it's mount security |
| 444 | * options were so it can use those later for submounts, displaying |
| 445 | * mount options, or whatever. |
| 446 | */ |
| 447 | static int selinux_get_mnt_opts(const struct super_block *sb, |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 448 | struct security_mnt_opts *opts) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 449 | { |
| 450 | int rc = 0, i; |
| 451 | struct superblock_security_struct *sbsec = sb->s_security; |
| 452 | char *context = NULL; |
| 453 | u32 len; |
| 454 | char tmp; |
| 455 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 456 | security_init_mnt_opts(opts); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 457 | |
| 458 | if (!sbsec->initialized) |
| 459 | return -EINVAL; |
| 460 | |
| 461 | if (!ss_initialized) |
| 462 | return -EINVAL; |
| 463 | |
| 464 | /* |
| 465 | * if we ever use sbsec flags for anything other than tracking mount |
| 466 | * settings this is going to need a mask |
| 467 | */ |
| 468 | tmp = sbsec->flags; |
| 469 | /* count the number of mount options for this sb */ |
| 470 | for (i = 0; i < 8; i++) { |
| 471 | if (tmp & 0x01) |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 472 | opts->num_mnt_opts++; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 473 | tmp >>= 1; |
| 474 | } |
| 475 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 476 | opts->mnt_opts = kcalloc(opts->num_mnt_opts, sizeof(char *), GFP_ATOMIC); |
| 477 | if (!opts->mnt_opts) { |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 478 | rc = -ENOMEM; |
| 479 | goto out_free; |
| 480 | } |
| 481 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 482 | opts->mnt_opts_flags = kcalloc(opts->num_mnt_opts, sizeof(int), GFP_ATOMIC); |
| 483 | if (!opts->mnt_opts_flags) { |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 484 | rc = -ENOMEM; |
| 485 | goto out_free; |
| 486 | } |
| 487 | |
| 488 | i = 0; |
| 489 | if (sbsec->flags & FSCONTEXT_MNT) { |
| 490 | rc = security_sid_to_context(sbsec->sid, &context, &len); |
| 491 | if (rc) |
| 492 | goto out_free; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 493 | opts->mnt_opts[i] = context; |
| 494 | opts->mnt_opts_flags[i++] = FSCONTEXT_MNT; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 495 | } |
| 496 | if (sbsec->flags & CONTEXT_MNT) { |
| 497 | rc = security_sid_to_context(sbsec->mntpoint_sid, &context, &len); |
| 498 | if (rc) |
| 499 | goto out_free; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 500 | opts->mnt_opts[i] = context; |
| 501 | opts->mnt_opts_flags[i++] = CONTEXT_MNT; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 502 | } |
| 503 | if (sbsec->flags & DEFCONTEXT_MNT) { |
| 504 | rc = security_sid_to_context(sbsec->def_sid, &context, &len); |
| 505 | if (rc) |
| 506 | goto out_free; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 507 | opts->mnt_opts[i] = context; |
| 508 | opts->mnt_opts_flags[i++] = DEFCONTEXT_MNT; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 509 | } |
| 510 | if (sbsec->flags & ROOTCONTEXT_MNT) { |
| 511 | struct inode *root = sbsec->sb->s_root->d_inode; |
| 512 | struct inode_security_struct *isec = root->i_security; |
| 513 | |
| 514 | rc = security_sid_to_context(isec->sid, &context, &len); |
| 515 | if (rc) |
| 516 | goto out_free; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 517 | opts->mnt_opts[i] = context; |
| 518 | opts->mnt_opts_flags[i++] = ROOTCONTEXT_MNT; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 519 | } |
| 520 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 521 | BUG_ON(i != opts->num_mnt_opts); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 522 | |
| 523 | return 0; |
| 524 | |
| 525 | out_free: |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 526 | security_free_mnt_opts(opts); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 527 | return rc; |
| 528 | } |
| 529 | |
| 530 | static int bad_option(struct superblock_security_struct *sbsec, char flag, |
| 531 | u32 old_sid, u32 new_sid) |
| 532 | { |
| 533 | /* check if the old mount command had the same options */ |
| 534 | if (sbsec->initialized) |
| 535 | if (!(sbsec->flags & flag) || |
| 536 | (old_sid != new_sid)) |
| 537 | return 1; |
| 538 | |
| 539 | /* check if we were passed the same options twice, |
| 540 | * aka someone passed context=a,context=b |
| 541 | */ |
| 542 | if (!sbsec->initialized) |
| 543 | if (sbsec->flags & flag) |
| 544 | return 1; |
| 545 | return 0; |
| 546 | } |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 547 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 548 | /* |
| 549 | * Allow filesystems with binary mount data to explicitly set mount point |
| 550 | * labeling information. |
| 551 | */ |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 552 | static int selinux_set_mnt_opts(struct super_block *sb, |
| 553 | struct security_mnt_opts *opts) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 554 | { |
| 555 | int rc = 0, i; |
| 556 | struct task_security_struct *tsec = current->security; |
| 557 | struct superblock_security_struct *sbsec = sb->s_security; |
| 558 | const char *name = sb->s_type->name; |
| 559 | struct inode *inode = sbsec->sb->s_root->d_inode; |
| 560 | struct inode_security_struct *root_isec = inode->i_security; |
| 561 | u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0; |
| 562 | u32 defcontext_sid = 0; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 563 | char **mount_options = opts->mnt_opts; |
| 564 | int *flags = opts->mnt_opts_flags; |
| 565 | int num_opts = opts->num_mnt_opts; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 566 | |
| 567 | mutex_lock(&sbsec->lock); |
| 568 | |
| 569 | if (!ss_initialized) { |
| 570 | if (!num_opts) { |
| 571 | /* Defer initialization until selinux_complete_init, |
| 572 | after the initial policy is loaded and the security |
| 573 | server is ready to handle calls. */ |
| 574 | spin_lock(&sb_security_lock); |
| 575 | if (list_empty(&sbsec->list)) |
| 576 | list_add(&sbsec->list, &superblock_security_head); |
| 577 | spin_unlock(&sb_security_lock); |
| 578 | goto out; |
| 579 | } |
| 580 | rc = -EINVAL; |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 581 | printk(KERN_WARNING "SELinux: Unable to set superblock options " |
| 582 | "before the security server is initialized\n"); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 583 | goto out; |
| 584 | } |
| 585 | |
| 586 | /* |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 587 | * Binary mount data FS will come through this function twice. Once |
| 588 | * from an explicit call and once from the generic calls from the vfs. |
| 589 | * Since the generic VFS calls will not contain any security mount data |
| 590 | * we need to skip the double mount verification. |
| 591 | * |
| 592 | * This does open a hole in which we will not notice if the first |
| 593 | * mount using this sb set explict options and a second mount using |
| 594 | * this sb does not set any security options. (The first options |
| 595 | * will be used for both mounts) |
| 596 | */ |
| 597 | if (sbsec->initialized && (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) |
| 598 | && (num_opts == 0)) |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 599 | goto out; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 600 | |
| 601 | /* |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 602 | * parse the mount options, check if they are valid sids. |
| 603 | * also check if someone is trying to mount the same sb more |
| 604 | * than once with different security options. |
| 605 | */ |
| 606 | for (i = 0; i < num_opts; i++) { |
| 607 | u32 sid; |
| 608 | rc = security_context_to_sid(mount_options[i], |
| 609 | strlen(mount_options[i]), &sid); |
| 610 | if (rc) { |
| 611 | printk(KERN_WARNING "SELinux: security_context_to_sid" |
| 612 | "(%s) failed for (dev %s, type %s) errno=%d\n", |
| 613 | mount_options[i], sb->s_id, name, rc); |
| 614 | goto out; |
| 615 | } |
| 616 | switch (flags[i]) { |
| 617 | case FSCONTEXT_MNT: |
| 618 | fscontext_sid = sid; |
| 619 | |
| 620 | if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, |
| 621 | fscontext_sid)) |
| 622 | goto out_double_mount; |
| 623 | |
| 624 | sbsec->flags |= FSCONTEXT_MNT; |
| 625 | break; |
| 626 | case CONTEXT_MNT: |
| 627 | context_sid = sid; |
| 628 | |
| 629 | if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, |
| 630 | context_sid)) |
| 631 | goto out_double_mount; |
| 632 | |
| 633 | sbsec->flags |= CONTEXT_MNT; |
| 634 | break; |
| 635 | case ROOTCONTEXT_MNT: |
| 636 | rootcontext_sid = sid; |
| 637 | |
| 638 | if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, |
| 639 | rootcontext_sid)) |
| 640 | goto out_double_mount; |
| 641 | |
| 642 | sbsec->flags |= ROOTCONTEXT_MNT; |
| 643 | |
| 644 | break; |
| 645 | case DEFCONTEXT_MNT: |
| 646 | defcontext_sid = sid; |
| 647 | |
| 648 | if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, |
| 649 | defcontext_sid)) |
| 650 | goto out_double_mount; |
| 651 | |
| 652 | sbsec->flags |= DEFCONTEXT_MNT; |
| 653 | |
| 654 | break; |
| 655 | default: |
| 656 | rc = -EINVAL; |
| 657 | goto out; |
| 658 | } |
| 659 | } |
| 660 | |
| 661 | if (sbsec->initialized) { |
| 662 | /* previously mounted with options, but not on this attempt? */ |
| 663 | if (sbsec->flags && !num_opts) |
| 664 | goto out_double_mount; |
| 665 | rc = 0; |
| 666 | goto out; |
| 667 | } |
| 668 | |
| 669 | if (strcmp(sb->s_type->name, "proc") == 0) |
| 670 | sbsec->proc = 1; |
| 671 | |
| 672 | /* Determine the labeling behavior to use for this filesystem type. */ |
| 673 | rc = security_fs_use(sb->s_type->name, &sbsec->behavior, &sbsec->sid); |
| 674 | if (rc) { |
| 675 | printk(KERN_WARNING "%s: security_fs_use(%s) returned %d\n", |
Harvey Harrison | dd6f953 | 2008-03-06 10:03:59 +1100 | [diff] [blame] | 676 | __func__, sb->s_type->name, rc); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 677 | goto out; |
| 678 | } |
| 679 | |
| 680 | /* sets the context of the superblock for the fs being mounted. */ |
| 681 | if (fscontext_sid) { |
| 682 | |
| 683 | rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, tsec); |
| 684 | if (rc) |
| 685 | goto out; |
| 686 | |
| 687 | sbsec->sid = fscontext_sid; |
| 688 | } |
| 689 | |
| 690 | /* |
| 691 | * Switch to using mount point labeling behavior. |
| 692 | * sets the label used on all file below the mountpoint, and will set |
| 693 | * the superblock context if not already set. |
| 694 | */ |
| 695 | if (context_sid) { |
| 696 | if (!fscontext_sid) { |
| 697 | rc = may_context_mount_sb_relabel(context_sid, sbsec, tsec); |
| 698 | if (rc) |
| 699 | goto out; |
| 700 | sbsec->sid = context_sid; |
| 701 | } else { |
| 702 | rc = may_context_mount_inode_relabel(context_sid, sbsec, tsec); |
| 703 | if (rc) |
| 704 | goto out; |
| 705 | } |
| 706 | if (!rootcontext_sid) |
| 707 | rootcontext_sid = context_sid; |
| 708 | |
| 709 | sbsec->mntpoint_sid = context_sid; |
| 710 | sbsec->behavior = SECURITY_FS_USE_MNTPOINT; |
| 711 | } |
| 712 | |
| 713 | if (rootcontext_sid) { |
| 714 | rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec, tsec); |
| 715 | if (rc) |
| 716 | goto out; |
| 717 | |
| 718 | root_isec->sid = rootcontext_sid; |
| 719 | root_isec->initialized = 1; |
| 720 | } |
| 721 | |
| 722 | if (defcontext_sid) { |
| 723 | if (sbsec->behavior != SECURITY_FS_USE_XATTR) { |
| 724 | rc = -EINVAL; |
| 725 | printk(KERN_WARNING "SELinux: defcontext option is " |
| 726 | "invalid for this filesystem type\n"); |
| 727 | goto out; |
| 728 | } |
| 729 | |
| 730 | if (defcontext_sid != sbsec->def_sid) { |
| 731 | rc = may_context_mount_inode_relabel(defcontext_sid, |
| 732 | sbsec, tsec); |
| 733 | if (rc) |
| 734 | goto out; |
| 735 | } |
| 736 | |
| 737 | sbsec->def_sid = defcontext_sid; |
| 738 | } |
| 739 | |
| 740 | rc = sb_finish_set_opts(sb); |
| 741 | out: |
Eric Paris | bc7e982 | 2006-09-25 23:32:02 -0700 | [diff] [blame] | 742 | mutex_unlock(&sbsec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | return rc; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 744 | out_double_mount: |
| 745 | rc = -EINVAL; |
| 746 | printk(KERN_WARNING "SELinux: mount invalid. Same superblock, different " |
| 747 | "security settings for (dev %s, type %s)\n", sb->s_id, name); |
| 748 | goto out; |
| 749 | } |
| 750 | |
| 751 | static void selinux_sb_clone_mnt_opts(const struct super_block *oldsb, |
| 752 | struct super_block *newsb) |
| 753 | { |
| 754 | const struct superblock_security_struct *oldsbsec = oldsb->s_security; |
| 755 | struct superblock_security_struct *newsbsec = newsb->s_security; |
| 756 | |
| 757 | int set_fscontext = (oldsbsec->flags & FSCONTEXT_MNT); |
| 758 | int set_context = (oldsbsec->flags & CONTEXT_MNT); |
| 759 | int set_rootcontext = (oldsbsec->flags & ROOTCONTEXT_MNT); |
| 760 | |
Eric Paris | 0f5e642 | 2008-04-21 16:24:11 -0400 | [diff] [blame] | 761 | /* |
| 762 | * if the parent was able to be mounted it clearly had no special lsm |
| 763 | * mount options. thus we can safely put this sb on the list and deal |
| 764 | * with it later |
| 765 | */ |
| 766 | if (!ss_initialized) { |
| 767 | spin_lock(&sb_security_lock); |
| 768 | if (list_empty(&newsbsec->list)) |
| 769 | list_add(&newsbsec->list, &superblock_security_head); |
| 770 | spin_unlock(&sb_security_lock); |
| 771 | return; |
| 772 | } |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 773 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 774 | /* how can we clone if the old one wasn't set up?? */ |
| 775 | BUG_ON(!oldsbsec->initialized); |
| 776 | |
Eric Paris | 5a55261 | 2008-04-09 14:08:35 -0400 | [diff] [blame] | 777 | /* if fs is reusing a sb, just let its options stand... */ |
| 778 | if (newsbsec->initialized) |
| 779 | return; |
| 780 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 781 | mutex_lock(&newsbsec->lock); |
| 782 | |
| 783 | newsbsec->flags = oldsbsec->flags; |
| 784 | |
| 785 | newsbsec->sid = oldsbsec->sid; |
| 786 | newsbsec->def_sid = oldsbsec->def_sid; |
| 787 | newsbsec->behavior = oldsbsec->behavior; |
| 788 | |
| 789 | if (set_context) { |
| 790 | u32 sid = oldsbsec->mntpoint_sid; |
| 791 | |
| 792 | if (!set_fscontext) |
| 793 | newsbsec->sid = sid; |
| 794 | if (!set_rootcontext) { |
| 795 | struct inode *newinode = newsb->s_root->d_inode; |
| 796 | struct inode_security_struct *newisec = newinode->i_security; |
| 797 | newisec->sid = sid; |
| 798 | } |
| 799 | newsbsec->mntpoint_sid = sid; |
| 800 | } |
| 801 | if (set_rootcontext) { |
| 802 | const struct inode *oldinode = oldsb->s_root->d_inode; |
| 803 | const struct inode_security_struct *oldisec = oldinode->i_security; |
| 804 | struct inode *newinode = newsb->s_root->d_inode; |
| 805 | struct inode_security_struct *newisec = newinode->i_security; |
| 806 | |
| 807 | newisec->sid = oldisec->sid; |
| 808 | } |
| 809 | |
| 810 | sb_finish_set_opts(newsb); |
| 811 | mutex_unlock(&newsbsec->lock); |
| 812 | } |
| 813 | |
Adrian Bunk | 2e1479d | 2008-03-17 22:29:23 +0200 | [diff] [blame] | 814 | static int selinux_parse_opts_str(char *options, |
| 815 | struct security_mnt_opts *opts) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 816 | { |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 817 | char *p; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 818 | char *context = NULL, *defcontext = NULL; |
| 819 | char *fscontext = NULL, *rootcontext = NULL; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 820 | int rc, num_mnt_opts = 0; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 821 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 822 | opts->num_mnt_opts = 0; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 823 | |
| 824 | /* Standard string-based options. */ |
| 825 | while ((p = strsep(&options, "|")) != NULL) { |
| 826 | int token; |
| 827 | substring_t args[MAX_OPT_ARGS]; |
| 828 | |
| 829 | if (!*p) |
| 830 | continue; |
| 831 | |
| 832 | token = match_token(p, tokens, args); |
| 833 | |
| 834 | switch (token) { |
| 835 | case Opt_context: |
| 836 | if (context || defcontext) { |
| 837 | rc = -EINVAL; |
| 838 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 839 | goto out_err; |
| 840 | } |
| 841 | context = match_strdup(&args[0]); |
| 842 | if (!context) { |
| 843 | rc = -ENOMEM; |
| 844 | goto out_err; |
| 845 | } |
| 846 | break; |
| 847 | |
| 848 | case Opt_fscontext: |
| 849 | if (fscontext) { |
| 850 | rc = -EINVAL; |
| 851 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 852 | goto out_err; |
| 853 | } |
| 854 | fscontext = match_strdup(&args[0]); |
| 855 | if (!fscontext) { |
| 856 | rc = -ENOMEM; |
| 857 | goto out_err; |
| 858 | } |
| 859 | break; |
| 860 | |
| 861 | case Opt_rootcontext: |
| 862 | if (rootcontext) { |
| 863 | rc = -EINVAL; |
| 864 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 865 | goto out_err; |
| 866 | } |
| 867 | rootcontext = match_strdup(&args[0]); |
| 868 | if (!rootcontext) { |
| 869 | rc = -ENOMEM; |
| 870 | goto out_err; |
| 871 | } |
| 872 | break; |
| 873 | |
| 874 | case Opt_defcontext: |
| 875 | if (context || defcontext) { |
| 876 | rc = -EINVAL; |
| 877 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 878 | goto out_err; |
| 879 | } |
| 880 | defcontext = match_strdup(&args[0]); |
| 881 | if (!defcontext) { |
| 882 | rc = -ENOMEM; |
| 883 | goto out_err; |
| 884 | } |
| 885 | break; |
| 886 | |
| 887 | default: |
| 888 | rc = -EINVAL; |
| 889 | printk(KERN_WARNING "SELinux: unknown mount option\n"); |
| 890 | goto out_err; |
| 891 | |
| 892 | } |
| 893 | } |
| 894 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 895 | rc = -ENOMEM; |
| 896 | opts->mnt_opts = kcalloc(NUM_SEL_MNT_OPTS, sizeof(char *), GFP_ATOMIC); |
| 897 | if (!opts->mnt_opts) |
| 898 | goto out_err; |
| 899 | |
| 900 | opts->mnt_opts_flags = kcalloc(NUM_SEL_MNT_OPTS, sizeof(int), GFP_ATOMIC); |
| 901 | if (!opts->mnt_opts_flags) { |
| 902 | kfree(opts->mnt_opts); |
| 903 | goto out_err; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 904 | } |
| 905 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 906 | if (fscontext) { |
| 907 | opts->mnt_opts[num_mnt_opts] = fscontext; |
| 908 | opts->mnt_opts_flags[num_mnt_opts++] = FSCONTEXT_MNT; |
| 909 | } |
| 910 | if (context) { |
| 911 | opts->mnt_opts[num_mnt_opts] = context; |
| 912 | opts->mnt_opts_flags[num_mnt_opts++] = CONTEXT_MNT; |
| 913 | } |
| 914 | if (rootcontext) { |
| 915 | opts->mnt_opts[num_mnt_opts] = rootcontext; |
| 916 | opts->mnt_opts_flags[num_mnt_opts++] = ROOTCONTEXT_MNT; |
| 917 | } |
| 918 | if (defcontext) { |
| 919 | opts->mnt_opts[num_mnt_opts] = defcontext; |
| 920 | opts->mnt_opts_flags[num_mnt_opts++] = DEFCONTEXT_MNT; |
| 921 | } |
| 922 | |
| 923 | opts->num_mnt_opts = num_mnt_opts; |
| 924 | return 0; |
| 925 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 926 | out_err: |
| 927 | kfree(context); |
| 928 | kfree(defcontext); |
| 929 | kfree(fscontext); |
| 930 | kfree(rootcontext); |
| 931 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | } |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 933 | /* |
| 934 | * string mount options parsing and call set the sbsec |
| 935 | */ |
| 936 | static int superblock_doinit(struct super_block *sb, void *data) |
| 937 | { |
| 938 | int rc = 0; |
| 939 | char *options = data; |
| 940 | struct security_mnt_opts opts; |
| 941 | |
| 942 | security_init_mnt_opts(&opts); |
| 943 | |
| 944 | if (!data) |
| 945 | goto out; |
| 946 | |
| 947 | BUG_ON(sb->s_type->fs_flags & FS_BINARY_MOUNTDATA); |
| 948 | |
| 949 | rc = selinux_parse_opts_str(options, &opts); |
| 950 | if (rc) |
| 951 | goto out_err; |
| 952 | |
| 953 | out: |
| 954 | rc = selinux_set_mnt_opts(sb, &opts); |
| 955 | |
| 956 | out_err: |
| 957 | security_free_mnt_opts(&opts); |
| 958 | return rc; |
| 959 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | |
| 961 | static inline u16 inode_mode_to_security_class(umode_t mode) |
| 962 | { |
| 963 | switch (mode & S_IFMT) { |
| 964 | case S_IFSOCK: |
| 965 | return SECCLASS_SOCK_FILE; |
| 966 | case S_IFLNK: |
| 967 | return SECCLASS_LNK_FILE; |
| 968 | case S_IFREG: |
| 969 | return SECCLASS_FILE; |
| 970 | case S_IFBLK: |
| 971 | return SECCLASS_BLK_FILE; |
| 972 | case S_IFDIR: |
| 973 | return SECCLASS_DIR; |
| 974 | case S_IFCHR: |
| 975 | return SECCLASS_CHR_FILE; |
| 976 | case S_IFIFO: |
| 977 | return SECCLASS_FIFO_FILE; |
| 978 | |
| 979 | } |
| 980 | |
| 981 | return SECCLASS_FILE; |
| 982 | } |
| 983 | |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 984 | static inline int default_protocol_stream(int protocol) |
| 985 | { |
| 986 | return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP); |
| 987 | } |
| 988 | |
| 989 | static inline int default_protocol_dgram(int protocol) |
| 990 | { |
| 991 | return (protocol == IPPROTO_IP || protocol == IPPROTO_UDP); |
| 992 | } |
| 993 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | static inline u16 socket_type_to_security_class(int family, int type, int protocol) |
| 995 | { |
| 996 | switch (family) { |
| 997 | case PF_UNIX: |
| 998 | switch (type) { |
| 999 | case SOCK_STREAM: |
| 1000 | case SOCK_SEQPACKET: |
| 1001 | return SECCLASS_UNIX_STREAM_SOCKET; |
| 1002 | case SOCK_DGRAM: |
| 1003 | return SECCLASS_UNIX_DGRAM_SOCKET; |
| 1004 | } |
| 1005 | break; |
| 1006 | case PF_INET: |
| 1007 | case PF_INET6: |
| 1008 | switch (type) { |
| 1009 | case SOCK_STREAM: |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 1010 | if (default_protocol_stream(protocol)) |
| 1011 | return SECCLASS_TCP_SOCKET; |
| 1012 | else |
| 1013 | return SECCLASS_RAWIP_SOCKET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | case SOCK_DGRAM: |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 1015 | if (default_protocol_dgram(protocol)) |
| 1016 | return SECCLASS_UDP_SOCKET; |
| 1017 | else |
| 1018 | return SECCLASS_RAWIP_SOCKET; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 1019 | case SOCK_DCCP: |
| 1020 | return SECCLASS_DCCP_SOCKET; |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 1021 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | return SECCLASS_RAWIP_SOCKET; |
| 1023 | } |
| 1024 | break; |
| 1025 | case PF_NETLINK: |
| 1026 | switch (protocol) { |
| 1027 | case NETLINK_ROUTE: |
| 1028 | return SECCLASS_NETLINK_ROUTE_SOCKET; |
| 1029 | case NETLINK_FIREWALL: |
| 1030 | return SECCLASS_NETLINK_FIREWALL_SOCKET; |
James Morris | 216efaa | 2005-08-15 20:34:48 -0700 | [diff] [blame] | 1031 | case NETLINK_INET_DIAG: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | return SECCLASS_NETLINK_TCPDIAG_SOCKET; |
| 1033 | case NETLINK_NFLOG: |
| 1034 | return SECCLASS_NETLINK_NFLOG_SOCKET; |
| 1035 | case NETLINK_XFRM: |
| 1036 | return SECCLASS_NETLINK_XFRM_SOCKET; |
| 1037 | case NETLINK_SELINUX: |
| 1038 | return SECCLASS_NETLINK_SELINUX_SOCKET; |
| 1039 | case NETLINK_AUDIT: |
| 1040 | return SECCLASS_NETLINK_AUDIT_SOCKET; |
| 1041 | case NETLINK_IP6_FW: |
| 1042 | return SECCLASS_NETLINK_IP6FW_SOCKET; |
| 1043 | case NETLINK_DNRTMSG: |
| 1044 | return SECCLASS_NETLINK_DNRT_SOCKET; |
James Morris | 0c9b794 | 2005-04-16 15:24:13 -0700 | [diff] [blame] | 1045 | case NETLINK_KOBJECT_UEVENT: |
| 1046 | return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | default: |
| 1048 | return SECCLASS_NETLINK_SOCKET; |
| 1049 | } |
| 1050 | case PF_PACKET: |
| 1051 | return SECCLASS_PACKET_SOCKET; |
| 1052 | case PF_KEY: |
| 1053 | return SECCLASS_KEY_SOCKET; |
Christopher J. PeBenito | 3e3ff15 | 2006-06-09 00:25:03 -0700 | [diff] [blame] | 1054 | case PF_APPLETALK: |
| 1055 | return SECCLASS_APPLETALK_SOCKET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | } |
| 1057 | |
| 1058 | return SECCLASS_SOCKET; |
| 1059 | } |
| 1060 | |
| 1061 | #ifdef CONFIG_PROC_FS |
| 1062 | static int selinux_proc_get_sid(struct proc_dir_entry *de, |
| 1063 | u16 tclass, |
| 1064 | u32 *sid) |
| 1065 | { |
| 1066 | int buflen, rc; |
| 1067 | char *buffer, *path, *end; |
| 1068 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1069 | buffer = (char *)__get_free_page(GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | if (!buffer) |
| 1071 | return -ENOMEM; |
| 1072 | |
| 1073 | buflen = PAGE_SIZE; |
| 1074 | end = buffer+buflen; |
| 1075 | *--end = '\0'; |
| 1076 | buflen--; |
| 1077 | path = end-1; |
| 1078 | *path = '/'; |
| 1079 | while (de && de != de->parent) { |
| 1080 | buflen -= de->namelen + 1; |
| 1081 | if (buflen < 0) |
| 1082 | break; |
| 1083 | end -= de->namelen; |
| 1084 | memcpy(end, de->name, de->namelen); |
| 1085 | *--end = '/'; |
| 1086 | path = end; |
| 1087 | de = de->parent; |
| 1088 | } |
| 1089 | rc = security_genfs_sid("proc", path, tclass, sid); |
| 1090 | free_page((unsigned long)buffer); |
| 1091 | return rc; |
| 1092 | } |
| 1093 | #else |
| 1094 | static int selinux_proc_get_sid(struct proc_dir_entry *de, |
| 1095 | u16 tclass, |
| 1096 | u32 *sid) |
| 1097 | { |
| 1098 | return -EINVAL; |
| 1099 | } |
| 1100 | #endif |
| 1101 | |
| 1102 | /* The inode's security attributes must be initialized before first use. */ |
| 1103 | static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry) |
| 1104 | { |
| 1105 | struct superblock_security_struct *sbsec = NULL; |
| 1106 | struct inode_security_struct *isec = inode->i_security; |
| 1107 | u32 sid; |
| 1108 | struct dentry *dentry; |
| 1109 | #define INITCONTEXTLEN 255 |
| 1110 | char *context = NULL; |
| 1111 | unsigned len = 0; |
| 1112 | int rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | |
| 1114 | if (isec->initialized) |
| 1115 | goto out; |
| 1116 | |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1117 | mutex_lock(&isec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | if (isec->initialized) |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1119 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1120 | |
| 1121 | sbsec = inode->i_sb->s_security; |
| 1122 | if (!sbsec->initialized) { |
| 1123 | /* Defer initialization until selinux_complete_init, |
| 1124 | after the initial policy is loaded and the security |
| 1125 | server is ready to handle calls. */ |
| 1126 | spin_lock(&sbsec->isec_lock); |
| 1127 | if (list_empty(&isec->list)) |
| 1128 | list_add(&isec->list, &sbsec->isec_head); |
| 1129 | spin_unlock(&sbsec->isec_lock); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1130 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1131 | } |
| 1132 | |
| 1133 | switch (sbsec->behavior) { |
| 1134 | case SECURITY_FS_USE_XATTR: |
| 1135 | if (!inode->i_op->getxattr) { |
| 1136 | isec->sid = sbsec->def_sid; |
| 1137 | break; |
| 1138 | } |
| 1139 | |
| 1140 | /* Need a dentry, since the xattr API requires one. |
| 1141 | Life would be simpler if we could just pass the inode. */ |
| 1142 | if (opt_dentry) { |
| 1143 | /* Called from d_instantiate or d_splice_alias. */ |
| 1144 | dentry = dget(opt_dentry); |
| 1145 | } else { |
| 1146 | /* Called from selinux_complete_init, try to find a dentry. */ |
| 1147 | dentry = d_find_alias(inode); |
| 1148 | } |
| 1149 | if (!dentry) { |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 1150 | printk(KERN_WARNING "SELinux: %s: no dentry for dev=%s " |
Harvey Harrison | dd6f953 | 2008-03-06 10:03:59 +1100 | [diff] [blame] | 1151 | "ino=%ld\n", __func__, inode->i_sb->s_id, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | inode->i_ino); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1153 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | } |
| 1155 | |
| 1156 | len = INITCONTEXTLEN; |
Stephen Smalley | 869ab51 | 2008-04-04 08:46:05 -0400 | [diff] [blame] | 1157 | context = kmalloc(len, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | if (!context) { |
| 1159 | rc = -ENOMEM; |
| 1160 | dput(dentry); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1161 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | } |
| 1163 | rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, |
| 1164 | context, len); |
| 1165 | if (rc == -ERANGE) { |
| 1166 | /* Need a larger buffer. Query for the right size. */ |
| 1167 | rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, |
| 1168 | NULL, 0); |
| 1169 | if (rc < 0) { |
| 1170 | dput(dentry); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1171 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | } |
| 1173 | kfree(context); |
| 1174 | len = rc; |
Stephen Smalley | 869ab51 | 2008-04-04 08:46:05 -0400 | [diff] [blame] | 1175 | context = kmalloc(len, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1176 | if (!context) { |
| 1177 | rc = -ENOMEM; |
| 1178 | dput(dentry); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1179 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | } |
| 1181 | rc = inode->i_op->getxattr(dentry, |
| 1182 | XATTR_NAME_SELINUX, |
| 1183 | context, len); |
| 1184 | } |
| 1185 | dput(dentry); |
| 1186 | if (rc < 0) { |
| 1187 | if (rc != -ENODATA) { |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 1188 | printk(KERN_WARNING "SELinux: %s: getxattr returned " |
Harvey Harrison | dd6f953 | 2008-03-06 10:03:59 +1100 | [diff] [blame] | 1189 | "%d for dev=%s ino=%ld\n", __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1190 | -rc, inode->i_sb->s_id, inode->i_ino); |
| 1191 | kfree(context); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1192 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1193 | } |
| 1194 | /* Map ENODATA to the default file SID */ |
| 1195 | sid = sbsec->def_sid; |
| 1196 | rc = 0; |
| 1197 | } else { |
James Morris | f5c1d5b | 2005-07-28 01:07:37 -0700 | [diff] [blame] | 1198 | rc = security_context_to_sid_default(context, rc, &sid, |
Stephen Smalley | 869ab51 | 2008-04-04 08:46:05 -0400 | [diff] [blame] | 1199 | sbsec->def_sid, |
| 1200 | GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1201 | if (rc) { |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 1202 | printk(KERN_WARNING "SELinux: %s: context_to_sid(%s) " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | "returned %d for dev=%s ino=%ld\n", |
Harvey Harrison | dd6f953 | 2008-03-06 10:03:59 +1100 | [diff] [blame] | 1204 | __func__, context, -rc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1205 | inode->i_sb->s_id, inode->i_ino); |
| 1206 | kfree(context); |
| 1207 | /* Leave with the unlabeled SID */ |
| 1208 | rc = 0; |
| 1209 | break; |
| 1210 | } |
| 1211 | } |
| 1212 | kfree(context); |
| 1213 | isec->sid = sid; |
| 1214 | break; |
| 1215 | case SECURITY_FS_USE_TASK: |
| 1216 | isec->sid = isec->task_sid; |
| 1217 | break; |
| 1218 | case SECURITY_FS_USE_TRANS: |
| 1219 | /* Default to the fs SID. */ |
| 1220 | isec->sid = sbsec->sid; |
| 1221 | |
| 1222 | /* Try to obtain a transition SID. */ |
| 1223 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
| 1224 | rc = security_transition_sid(isec->task_sid, |
| 1225 | sbsec->sid, |
| 1226 | isec->sclass, |
| 1227 | &sid); |
| 1228 | if (rc) |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1229 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1230 | isec->sid = sid; |
| 1231 | break; |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 1232 | case SECURITY_FS_USE_MNTPOINT: |
| 1233 | isec->sid = sbsec->mntpoint_sid; |
| 1234 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | default: |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 1236 | /* Default to the fs superblock SID. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | isec->sid = sbsec->sid; |
| 1238 | |
| 1239 | if (sbsec->proc) { |
| 1240 | struct proc_inode *proci = PROC_I(inode); |
| 1241 | if (proci->pde) { |
| 1242 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
| 1243 | rc = selinux_proc_get_sid(proci->pde, |
| 1244 | isec->sclass, |
| 1245 | &sid); |
| 1246 | if (rc) |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1247 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | isec->sid = sid; |
| 1249 | } |
| 1250 | } |
| 1251 | break; |
| 1252 | } |
| 1253 | |
| 1254 | isec->initialized = 1; |
| 1255 | |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1256 | out_unlock: |
| 1257 | mutex_unlock(&isec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1258 | out: |
| 1259 | if (isec->sclass == SECCLASS_FILE) |
| 1260 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | return rc; |
| 1262 | } |
| 1263 | |
| 1264 | /* Convert a Linux signal to an access vector. */ |
| 1265 | static inline u32 signal_to_av(int sig) |
| 1266 | { |
| 1267 | u32 perm = 0; |
| 1268 | |
| 1269 | switch (sig) { |
| 1270 | case SIGCHLD: |
| 1271 | /* Commonly granted from child to parent. */ |
| 1272 | perm = PROCESS__SIGCHLD; |
| 1273 | break; |
| 1274 | case SIGKILL: |
| 1275 | /* Cannot be caught or ignored */ |
| 1276 | perm = PROCESS__SIGKILL; |
| 1277 | break; |
| 1278 | case SIGSTOP: |
| 1279 | /* Cannot be caught or ignored */ |
| 1280 | perm = PROCESS__SIGSTOP; |
| 1281 | break; |
| 1282 | default: |
| 1283 | /* All other signals. */ |
| 1284 | perm = PROCESS__SIGNAL; |
| 1285 | break; |
| 1286 | } |
| 1287 | |
| 1288 | return perm; |
| 1289 | } |
| 1290 | |
| 1291 | /* Check permission betweeen a pair of tasks, e.g. signal checks, |
| 1292 | fork check, ptrace check, etc. */ |
| 1293 | static int task_has_perm(struct task_struct *tsk1, |
| 1294 | struct task_struct *tsk2, |
| 1295 | u32 perms) |
| 1296 | { |
| 1297 | struct task_security_struct *tsec1, *tsec2; |
| 1298 | |
| 1299 | tsec1 = tsk1->security; |
| 1300 | tsec2 = tsk2->security; |
| 1301 | return avc_has_perm(tsec1->sid, tsec2->sid, |
| 1302 | SECCLASS_PROCESS, perms, NULL); |
| 1303 | } |
| 1304 | |
Stephen Smalley | b68e418 | 2008-02-07 11:21:04 -0500 | [diff] [blame] | 1305 | #if CAP_LAST_CAP > 63 |
| 1306 | #error Fix SELinux to handle capabilities > 63. |
| 1307 | #endif |
| 1308 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | /* Check whether a task is allowed to use a capability. */ |
| 1310 | static int task_has_capability(struct task_struct *tsk, |
| 1311 | int cap) |
| 1312 | { |
| 1313 | struct task_security_struct *tsec; |
| 1314 | struct avc_audit_data ad; |
Stephen Smalley | b68e418 | 2008-02-07 11:21:04 -0500 | [diff] [blame] | 1315 | u16 sclass; |
| 1316 | u32 av = CAP_TO_MASK(cap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1317 | |
| 1318 | tsec = tsk->security; |
| 1319 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1320 | AVC_AUDIT_DATA_INIT(&ad, CAP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | ad.tsk = tsk; |
| 1322 | ad.u.cap = cap; |
| 1323 | |
Stephen Smalley | b68e418 | 2008-02-07 11:21:04 -0500 | [diff] [blame] | 1324 | switch (CAP_TO_INDEX(cap)) { |
| 1325 | case 0: |
| 1326 | sclass = SECCLASS_CAPABILITY; |
| 1327 | break; |
| 1328 | case 1: |
| 1329 | sclass = SECCLASS_CAPABILITY2; |
| 1330 | break; |
| 1331 | default: |
| 1332 | printk(KERN_ERR |
| 1333 | "SELinux: out of range capability %d\n", cap); |
| 1334 | BUG(); |
| 1335 | } |
| 1336 | return avc_has_perm(tsec->sid, tsec->sid, sclass, av, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1337 | } |
| 1338 | |
| 1339 | /* Check whether a task is allowed to use a system operation. */ |
| 1340 | static int task_has_system(struct task_struct *tsk, |
| 1341 | u32 perms) |
| 1342 | { |
| 1343 | struct task_security_struct *tsec; |
| 1344 | |
| 1345 | tsec = tsk->security; |
| 1346 | |
| 1347 | return avc_has_perm(tsec->sid, SECINITSID_KERNEL, |
| 1348 | SECCLASS_SYSTEM, perms, NULL); |
| 1349 | } |
| 1350 | |
| 1351 | /* Check whether a task has a particular permission to an inode. |
| 1352 | The 'adp' parameter is optional and allows other audit |
| 1353 | data to be passed (e.g. the dentry). */ |
| 1354 | static int inode_has_perm(struct task_struct *tsk, |
| 1355 | struct inode *inode, |
| 1356 | u32 perms, |
| 1357 | struct avc_audit_data *adp) |
| 1358 | { |
| 1359 | struct task_security_struct *tsec; |
| 1360 | struct inode_security_struct *isec; |
| 1361 | struct avc_audit_data ad; |
| 1362 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1363 | if (unlikely(IS_PRIVATE(inode))) |
Stephen Smalley | bbaca6c | 2007-02-14 00:34:16 -0800 | [diff] [blame] | 1364 | return 0; |
| 1365 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | tsec = tsk->security; |
| 1367 | isec = inode->i_security; |
| 1368 | |
| 1369 | if (!adp) { |
| 1370 | adp = &ad; |
| 1371 | AVC_AUDIT_DATA_INIT(&ad, FS); |
| 1372 | ad.u.fs.inode = inode; |
| 1373 | } |
| 1374 | |
| 1375 | return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, adp); |
| 1376 | } |
| 1377 | |
| 1378 | /* Same as inode_has_perm, but pass explicit audit data containing |
| 1379 | the dentry to help the auditing code to more easily generate the |
| 1380 | pathname if needed. */ |
| 1381 | static inline int dentry_has_perm(struct task_struct *tsk, |
| 1382 | struct vfsmount *mnt, |
| 1383 | struct dentry *dentry, |
| 1384 | u32 av) |
| 1385 | { |
| 1386 | struct inode *inode = dentry->d_inode; |
| 1387 | struct avc_audit_data ad; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1388 | AVC_AUDIT_DATA_INIT(&ad, FS); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1389 | ad.u.fs.path.mnt = mnt; |
| 1390 | ad.u.fs.path.dentry = dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1391 | return inode_has_perm(tsk, inode, av, &ad); |
| 1392 | } |
| 1393 | |
| 1394 | /* Check whether a task can use an open file descriptor to |
| 1395 | access an inode in a given way. Check access to the |
| 1396 | descriptor itself, and then use dentry_has_perm to |
| 1397 | check a particular permission to the file. |
| 1398 | Access to the descriptor is implicitly granted if it |
| 1399 | has the same SID as the process. If av is zero, then |
| 1400 | access to the file is not checked, e.g. for cases |
| 1401 | where only the descriptor is affected like seek. */ |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 1402 | static int file_has_perm(struct task_struct *tsk, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1403 | struct file *file, |
| 1404 | u32 av) |
| 1405 | { |
| 1406 | struct task_security_struct *tsec = tsk->security; |
| 1407 | struct file_security_struct *fsec = file->f_security; |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1408 | struct inode *inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | struct avc_audit_data ad; |
| 1410 | int rc; |
| 1411 | |
| 1412 | AVC_AUDIT_DATA_INIT(&ad, FS); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1413 | ad.u.fs.path = file->f_path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | |
| 1415 | if (tsec->sid != fsec->sid) { |
| 1416 | rc = avc_has_perm(tsec->sid, fsec->sid, |
| 1417 | SECCLASS_FD, |
| 1418 | FD__USE, |
| 1419 | &ad); |
| 1420 | if (rc) |
| 1421 | return rc; |
| 1422 | } |
| 1423 | |
| 1424 | /* av is zero if only checking access to the descriptor. */ |
| 1425 | if (av) |
| 1426 | return inode_has_perm(tsk, inode, av, &ad); |
| 1427 | |
| 1428 | return 0; |
| 1429 | } |
| 1430 | |
| 1431 | /* Check whether a task can create a file. */ |
| 1432 | static int may_create(struct inode *dir, |
| 1433 | struct dentry *dentry, |
| 1434 | u16 tclass) |
| 1435 | { |
| 1436 | struct task_security_struct *tsec; |
| 1437 | struct inode_security_struct *dsec; |
| 1438 | struct superblock_security_struct *sbsec; |
| 1439 | u32 newsid; |
| 1440 | struct avc_audit_data ad; |
| 1441 | int rc; |
| 1442 | |
| 1443 | tsec = current->security; |
| 1444 | dsec = dir->i_security; |
| 1445 | sbsec = dir->i_sb->s_security; |
| 1446 | |
| 1447 | AVC_AUDIT_DATA_INIT(&ad, FS); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1448 | ad.u.fs.path.dentry = dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | |
| 1450 | rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR, |
| 1451 | DIR__ADD_NAME | DIR__SEARCH, |
| 1452 | &ad); |
| 1453 | if (rc) |
| 1454 | return rc; |
| 1455 | |
| 1456 | if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) { |
| 1457 | newsid = tsec->create_sid; |
| 1458 | } else { |
| 1459 | rc = security_transition_sid(tsec->sid, dsec->sid, tclass, |
| 1460 | &newsid); |
| 1461 | if (rc) |
| 1462 | return rc; |
| 1463 | } |
| 1464 | |
| 1465 | rc = avc_has_perm(tsec->sid, newsid, tclass, FILE__CREATE, &ad); |
| 1466 | if (rc) |
| 1467 | return rc; |
| 1468 | |
| 1469 | return avc_has_perm(newsid, sbsec->sid, |
| 1470 | SECCLASS_FILESYSTEM, |
| 1471 | FILESYSTEM__ASSOCIATE, &ad); |
| 1472 | } |
| 1473 | |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 1474 | /* Check whether a task can create a key. */ |
| 1475 | static int may_create_key(u32 ksid, |
| 1476 | struct task_struct *ctx) |
| 1477 | { |
| 1478 | struct task_security_struct *tsec; |
| 1479 | |
| 1480 | tsec = ctx->security; |
| 1481 | |
| 1482 | return avc_has_perm(tsec->sid, ksid, SECCLASS_KEY, KEY__CREATE, NULL); |
| 1483 | } |
| 1484 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1485 | #define MAY_LINK 0 |
| 1486 | #define MAY_UNLINK 1 |
| 1487 | #define MAY_RMDIR 2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1488 | |
| 1489 | /* Check whether a task can link, unlink, or rmdir a file/directory. */ |
| 1490 | static int may_link(struct inode *dir, |
| 1491 | struct dentry *dentry, |
| 1492 | int kind) |
| 1493 | |
| 1494 | { |
| 1495 | struct task_security_struct *tsec; |
| 1496 | struct inode_security_struct *dsec, *isec; |
| 1497 | struct avc_audit_data ad; |
| 1498 | u32 av; |
| 1499 | int rc; |
| 1500 | |
| 1501 | tsec = current->security; |
| 1502 | dsec = dir->i_security; |
| 1503 | isec = dentry->d_inode->i_security; |
| 1504 | |
| 1505 | AVC_AUDIT_DATA_INIT(&ad, FS); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1506 | ad.u.fs.path.dentry = dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1507 | |
| 1508 | av = DIR__SEARCH; |
| 1509 | av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME); |
| 1510 | rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR, av, &ad); |
| 1511 | if (rc) |
| 1512 | return rc; |
| 1513 | |
| 1514 | switch (kind) { |
| 1515 | case MAY_LINK: |
| 1516 | av = FILE__LINK; |
| 1517 | break; |
| 1518 | case MAY_UNLINK: |
| 1519 | av = FILE__UNLINK; |
| 1520 | break; |
| 1521 | case MAY_RMDIR: |
| 1522 | av = DIR__RMDIR; |
| 1523 | break; |
| 1524 | default: |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 1525 | printk(KERN_WARNING "SELinux: %s: unrecognized kind %d\n", |
| 1526 | __func__, kind); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1527 | return 0; |
| 1528 | } |
| 1529 | |
| 1530 | rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass, av, &ad); |
| 1531 | return rc; |
| 1532 | } |
| 1533 | |
| 1534 | static inline int may_rename(struct inode *old_dir, |
| 1535 | struct dentry *old_dentry, |
| 1536 | struct inode *new_dir, |
| 1537 | struct dentry *new_dentry) |
| 1538 | { |
| 1539 | struct task_security_struct *tsec; |
| 1540 | struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec; |
| 1541 | struct avc_audit_data ad; |
| 1542 | u32 av; |
| 1543 | int old_is_dir, new_is_dir; |
| 1544 | int rc; |
| 1545 | |
| 1546 | tsec = current->security; |
| 1547 | old_dsec = old_dir->i_security; |
| 1548 | old_isec = old_dentry->d_inode->i_security; |
| 1549 | old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode); |
| 1550 | new_dsec = new_dir->i_security; |
| 1551 | |
| 1552 | AVC_AUDIT_DATA_INIT(&ad, FS); |
| 1553 | |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1554 | ad.u.fs.path.dentry = old_dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | rc = avc_has_perm(tsec->sid, old_dsec->sid, SECCLASS_DIR, |
| 1556 | DIR__REMOVE_NAME | DIR__SEARCH, &ad); |
| 1557 | if (rc) |
| 1558 | return rc; |
| 1559 | rc = avc_has_perm(tsec->sid, old_isec->sid, |
| 1560 | old_isec->sclass, FILE__RENAME, &ad); |
| 1561 | if (rc) |
| 1562 | return rc; |
| 1563 | if (old_is_dir && new_dir != old_dir) { |
| 1564 | rc = avc_has_perm(tsec->sid, old_isec->sid, |
| 1565 | old_isec->sclass, DIR__REPARENT, &ad); |
| 1566 | if (rc) |
| 1567 | return rc; |
| 1568 | } |
| 1569 | |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1570 | ad.u.fs.path.dentry = new_dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1571 | av = DIR__ADD_NAME | DIR__SEARCH; |
| 1572 | if (new_dentry->d_inode) |
| 1573 | av |= DIR__REMOVE_NAME; |
| 1574 | rc = avc_has_perm(tsec->sid, new_dsec->sid, SECCLASS_DIR, av, &ad); |
| 1575 | if (rc) |
| 1576 | return rc; |
| 1577 | if (new_dentry->d_inode) { |
| 1578 | new_isec = new_dentry->d_inode->i_security; |
| 1579 | new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode); |
| 1580 | rc = avc_has_perm(tsec->sid, new_isec->sid, |
| 1581 | new_isec->sclass, |
| 1582 | (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad); |
| 1583 | if (rc) |
| 1584 | return rc; |
| 1585 | } |
| 1586 | |
| 1587 | return 0; |
| 1588 | } |
| 1589 | |
| 1590 | /* Check whether a task can perform a filesystem operation. */ |
| 1591 | static int superblock_has_perm(struct task_struct *tsk, |
| 1592 | struct super_block *sb, |
| 1593 | u32 perms, |
| 1594 | struct avc_audit_data *ad) |
| 1595 | { |
| 1596 | struct task_security_struct *tsec; |
| 1597 | struct superblock_security_struct *sbsec; |
| 1598 | |
| 1599 | tsec = tsk->security; |
| 1600 | sbsec = sb->s_security; |
| 1601 | return avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, |
| 1602 | perms, ad); |
| 1603 | } |
| 1604 | |
| 1605 | /* Convert a Linux mode and permission mask to an access vector. */ |
| 1606 | static inline u32 file_mask_to_av(int mode, int mask) |
| 1607 | { |
| 1608 | u32 av = 0; |
| 1609 | |
| 1610 | if ((mode & S_IFMT) != S_IFDIR) { |
| 1611 | if (mask & MAY_EXEC) |
| 1612 | av |= FILE__EXECUTE; |
| 1613 | if (mask & MAY_READ) |
| 1614 | av |= FILE__READ; |
| 1615 | |
| 1616 | if (mask & MAY_APPEND) |
| 1617 | av |= FILE__APPEND; |
| 1618 | else if (mask & MAY_WRITE) |
| 1619 | av |= FILE__WRITE; |
| 1620 | |
| 1621 | } else { |
| 1622 | if (mask & MAY_EXEC) |
| 1623 | av |= DIR__SEARCH; |
| 1624 | if (mask & MAY_WRITE) |
| 1625 | av |= DIR__WRITE; |
| 1626 | if (mask & MAY_READ) |
| 1627 | av |= DIR__READ; |
| 1628 | } |
| 1629 | |
| 1630 | return av; |
| 1631 | } |
| 1632 | |
Eric Paris | b0c636b | 2008-02-28 12:58:40 -0500 | [diff] [blame] | 1633 | /* |
| 1634 | * Convert a file mask to an access vector and include the correct open |
| 1635 | * open permission. |
| 1636 | */ |
| 1637 | static inline u32 open_file_mask_to_av(int mode, int mask) |
| 1638 | { |
| 1639 | u32 av = file_mask_to_av(mode, mask); |
| 1640 | |
| 1641 | if (selinux_policycap_openperm) { |
| 1642 | /* |
| 1643 | * lnk files and socks do not really have an 'open' |
| 1644 | */ |
| 1645 | if (S_ISREG(mode)) |
| 1646 | av |= FILE__OPEN; |
| 1647 | else if (S_ISCHR(mode)) |
| 1648 | av |= CHR_FILE__OPEN; |
| 1649 | else if (S_ISBLK(mode)) |
| 1650 | av |= BLK_FILE__OPEN; |
| 1651 | else if (S_ISFIFO(mode)) |
| 1652 | av |= FIFO_FILE__OPEN; |
| 1653 | else if (S_ISDIR(mode)) |
| 1654 | av |= DIR__OPEN; |
| 1655 | else |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 1656 | printk(KERN_ERR "SELinux: WARNING: inside %s with " |
| 1657 | "unknown mode:%x\n", __func__, mode); |
Eric Paris | b0c636b | 2008-02-28 12:58:40 -0500 | [diff] [blame] | 1658 | } |
| 1659 | return av; |
| 1660 | } |
| 1661 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1662 | /* Convert a Linux file to an access vector. */ |
| 1663 | static inline u32 file_to_av(struct file *file) |
| 1664 | { |
| 1665 | u32 av = 0; |
| 1666 | |
| 1667 | if (file->f_mode & FMODE_READ) |
| 1668 | av |= FILE__READ; |
| 1669 | if (file->f_mode & FMODE_WRITE) { |
| 1670 | if (file->f_flags & O_APPEND) |
| 1671 | av |= FILE__APPEND; |
| 1672 | else |
| 1673 | av |= FILE__WRITE; |
| 1674 | } |
Stephen Smalley | 0794c66 | 2008-03-17 08:55:18 -0400 | [diff] [blame] | 1675 | if (!av) { |
| 1676 | /* |
| 1677 | * Special file opened with flags 3 for ioctl-only use. |
| 1678 | */ |
| 1679 | av = FILE__IOCTL; |
| 1680 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1681 | |
| 1682 | return av; |
| 1683 | } |
| 1684 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1685 | /* Hook functions begin here. */ |
| 1686 | |
Stephen Smalley | 006ebb4 | 2008-05-19 08:32:49 -0400 | [diff] [blame] | 1687 | static int selinux_ptrace(struct task_struct *parent, |
| 1688 | struct task_struct *child, |
| 1689 | unsigned int mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1691 | int rc; |
| 1692 | |
Stephen Smalley | 006ebb4 | 2008-05-19 08:32:49 -0400 | [diff] [blame] | 1693 | rc = secondary_ops->ptrace(parent, child, mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1694 | if (rc) |
| 1695 | return rc; |
| 1696 | |
Stephen Smalley | 006ebb4 | 2008-05-19 08:32:49 -0400 | [diff] [blame] | 1697 | if (mode == PTRACE_MODE_READ) { |
| 1698 | struct task_security_struct *tsec = parent->security; |
| 1699 | struct task_security_struct *csec = child->security; |
| 1700 | return avc_has_perm(tsec->sid, csec->sid, |
| 1701 | SECCLASS_FILE, FILE__READ, NULL); |
| 1702 | } |
| 1703 | |
Roland McGrath | 0356357 | 2008-03-26 15:46:39 -0700 | [diff] [blame] | 1704 | return task_has_perm(parent, child, PROCESS__PTRACE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1705 | } |
| 1706 | |
| 1707 | static int selinux_capget(struct task_struct *target, kernel_cap_t *effective, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1708 | kernel_cap_t *inheritable, kernel_cap_t *permitted) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1709 | { |
| 1710 | int error; |
| 1711 | |
| 1712 | error = task_has_perm(current, target, PROCESS__GETCAP); |
| 1713 | if (error) |
| 1714 | return error; |
| 1715 | |
| 1716 | return secondary_ops->capget(target, effective, inheritable, permitted); |
| 1717 | } |
| 1718 | |
| 1719 | static int selinux_capset_check(struct task_struct *target, kernel_cap_t *effective, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1720 | kernel_cap_t *inheritable, kernel_cap_t *permitted) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1721 | { |
| 1722 | int error; |
| 1723 | |
| 1724 | error = secondary_ops->capset_check(target, effective, inheritable, permitted); |
| 1725 | if (error) |
| 1726 | return error; |
| 1727 | |
| 1728 | return task_has_perm(current, target, PROCESS__SETCAP); |
| 1729 | } |
| 1730 | |
| 1731 | static void selinux_capset_set(struct task_struct *target, kernel_cap_t *effective, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1732 | kernel_cap_t *inheritable, kernel_cap_t *permitted) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1733 | { |
| 1734 | secondary_ops->capset_set(target, effective, inheritable, permitted); |
| 1735 | } |
| 1736 | |
| 1737 | static int selinux_capable(struct task_struct *tsk, int cap) |
| 1738 | { |
| 1739 | int rc; |
| 1740 | |
| 1741 | rc = secondary_ops->capable(tsk, cap); |
| 1742 | if (rc) |
| 1743 | return rc; |
| 1744 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1745 | return task_has_capability(tsk, cap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1746 | } |
| 1747 | |
Eric W. Biederman | 3fbfa98 | 2007-02-14 00:34:14 -0800 | [diff] [blame] | 1748 | static int selinux_sysctl_get_sid(ctl_table *table, u16 tclass, u32 *sid) |
| 1749 | { |
| 1750 | int buflen, rc; |
| 1751 | char *buffer, *path, *end; |
| 1752 | |
| 1753 | rc = -ENOMEM; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1754 | buffer = (char *)__get_free_page(GFP_KERNEL); |
Eric W. Biederman | 3fbfa98 | 2007-02-14 00:34:14 -0800 | [diff] [blame] | 1755 | if (!buffer) |
| 1756 | goto out; |
| 1757 | |
| 1758 | buflen = PAGE_SIZE; |
| 1759 | end = buffer+buflen; |
| 1760 | *--end = '\0'; |
| 1761 | buflen--; |
| 1762 | path = end-1; |
| 1763 | *path = '/'; |
| 1764 | while (table) { |
| 1765 | const char *name = table->procname; |
| 1766 | size_t namelen = strlen(name); |
| 1767 | buflen -= namelen + 1; |
| 1768 | if (buflen < 0) |
| 1769 | goto out_free; |
| 1770 | end -= namelen; |
| 1771 | memcpy(end, name, namelen); |
| 1772 | *--end = '/'; |
| 1773 | path = end; |
| 1774 | table = table->parent; |
| 1775 | } |
Eric W. Biederman | b599fdf | 2007-02-14 00:34:15 -0800 | [diff] [blame] | 1776 | buflen -= 4; |
| 1777 | if (buflen < 0) |
| 1778 | goto out_free; |
| 1779 | end -= 4; |
| 1780 | memcpy(end, "/sys", 4); |
| 1781 | path = end; |
Eric W. Biederman | 3fbfa98 | 2007-02-14 00:34:14 -0800 | [diff] [blame] | 1782 | rc = security_genfs_sid("proc", path, tclass, sid); |
| 1783 | out_free: |
| 1784 | free_page((unsigned long)buffer); |
| 1785 | out: |
| 1786 | return rc; |
| 1787 | } |
| 1788 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1789 | static int selinux_sysctl(ctl_table *table, int op) |
| 1790 | { |
| 1791 | int error = 0; |
| 1792 | u32 av; |
| 1793 | struct task_security_struct *tsec; |
| 1794 | u32 tsid; |
| 1795 | int rc; |
| 1796 | |
| 1797 | rc = secondary_ops->sysctl(table, op); |
| 1798 | if (rc) |
| 1799 | return rc; |
| 1800 | |
| 1801 | tsec = current->security; |
| 1802 | |
Eric W. Biederman | 3fbfa98 | 2007-02-14 00:34:14 -0800 | [diff] [blame] | 1803 | rc = selinux_sysctl_get_sid(table, (op == 0001) ? |
| 1804 | SECCLASS_DIR : SECCLASS_FILE, &tsid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1805 | if (rc) { |
| 1806 | /* Default to the well-defined sysctl SID. */ |
| 1807 | tsid = SECINITSID_SYSCTL; |
| 1808 | } |
| 1809 | |
| 1810 | /* The op values are "defined" in sysctl.c, thereby creating |
| 1811 | * a bad coupling between this module and sysctl.c */ |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1812 | if (op == 001) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1813 | error = avc_has_perm(tsec->sid, tsid, |
| 1814 | SECCLASS_DIR, DIR__SEARCH, NULL); |
| 1815 | } else { |
| 1816 | av = 0; |
| 1817 | if (op & 004) |
| 1818 | av |= FILE__READ; |
| 1819 | if (op & 002) |
| 1820 | av |= FILE__WRITE; |
| 1821 | if (av) |
| 1822 | error = avc_has_perm(tsec->sid, tsid, |
| 1823 | SECCLASS_FILE, av, NULL); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1824 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1825 | |
| 1826 | return error; |
| 1827 | } |
| 1828 | |
| 1829 | static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb) |
| 1830 | { |
| 1831 | int rc = 0; |
| 1832 | |
| 1833 | if (!sb) |
| 1834 | return 0; |
| 1835 | |
| 1836 | switch (cmds) { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1837 | case Q_SYNC: |
| 1838 | case Q_QUOTAON: |
| 1839 | case Q_QUOTAOFF: |
| 1840 | case Q_SETINFO: |
| 1841 | case Q_SETQUOTA: |
| 1842 | rc = superblock_has_perm(current, sb, FILESYSTEM__QUOTAMOD, |
| 1843 | NULL); |
| 1844 | break; |
| 1845 | case Q_GETFMT: |
| 1846 | case Q_GETINFO: |
| 1847 | case Q_GETQUOTA: |
| 1848 | rc = superblock_has_perm(current, sb, FILESYSTEM__QUOTAGET, |
| 1849 | NULL); |
| 1850 | break; |
| 1851 | default: |
| 1852 | rc = 0; /* let the kernel handle invalid cmds */ |
| 1853 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1854 | } |
| 1855 | return rc; |
| 1856 | } |
| 1857 | |
| 1858 | static int selinux_quota_on(struct dentry *dentry) |
| 1859 | { |
| 1860 | return dentry_has_perm(current, NULL, dentry, FILE__QUOTAON); |
| 1861 | } |
| 1862 | |
| 1863 | static int selinux_syslog(int type) |
| 1864 | { |
| 1865 | int rc; |
| 1866 | |
| 1867 | rc = secondary_ops->syslog(type); |
| 1868 | if (rc) |
| 1869 | return rc; |
| 1870 | |
| 1871 | switch (type) { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1872 | case 3: /* Read last kernel messages */ |
| 1873 | case 10: /* Return size of the log buffer */ |
| 1874 | rc = task_has_system(current, SYSTEM__SYSLOG_READ); |
| 1875 | break; |
| 1876 | case 6: /* Disable logging to console */ |
| 1877 | case 7: /* Enable logging to console */ |
| 1878 | case 8: /* Set level of messages printed to console */ |
| 1879 | rc = task_has_system(current, SYSTEM__SYSLOG_CONSOLE); |
| 1880 | break; |
| 1881 | case 0: /* Close log */ |
| 1882 | case 1: /* Open log */ |
| 1883 | case 2: /* Read from log */ |
| 1884 | case 4: /* Read/clear last kernel messages */ |
| 1885 | case 5: /* Clear ring buffer */ |
| 1886 | default: |
| 1887 | rc = task_has_system(current, SYSTEM__SYSLOG_MOD); |
| 1888 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1889 | } |
| 1890 | return rc; |
| 1891 | } |
| 1892 | |
| 1893 | /* |
| 1894 | * Check that a process has enough memory to allocate a new virtual |
| 1895 | * mapping. 0 means there is enough memory for the allocation to |
| 1896 | * succeed and -ENOMEM implies there is not. |
| 1897 | * |
| 1898 | * Note that secondary_ops->capable and task_has_perm_noaudit return 0 |
| 1899 | * if the capability is granted, but __vm_enough_memory requires 1 if |
| 1900 | * the capability is granted. |
| 1901 | * |
| 1902 | * Do not audit the selinux permission check, as this is applied to all |
| 1903 | * processes that allocate mappings. |
| 1904 | */ |
Alan Cox | 34b4e4a | 2007-08-22 14:01:28 -0700 | [diff] [blame] | 1905 | static int selinux_vm_enough_memory(struct mm_struct *mm, long pages) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1906 | { |
| 1907 | int rc, cap_sys_admin = 0; |
| 1908 | struct task_security_struct *tsec = current->security; |
| 1909 | |
| 1910 | rc = secondary_ops->capable(current, CAP_SYS_ADMIN); |
| 1911 | if (rc == 0) |
| 1912 | rc = avc_has_perm_noaudit(tsec->sid, tsec->sid, |
Stephen Smalley | 2c3c05d | 2007-06-07 15:34:10 -0400 | [diff] [blame] | 1913 | SECCLASS_CAPABILITY, |
| 1914 | CAP_TO_MASK(CAP_SYS_ADMIN), |
| 1915 | 0, |
| 1916 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1917 | |
| 1918 | if (rc == 0) |
| 1919 | cap_sys_admin = 1; |
| 1920 | |
Alan Cox | 34b4e4a | 2007-08-22 14:01:28 -0700 | [diff] [blame] | 1921 | return __vm_enough_memory(mm, pages, cap_sys_admin); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1922 | } |
| 1923 | |
Roland McGrath | 0356357 | 2008-03-26 15:46:39 -0700 | [diff] [blame] | 1924 | /** |
| 1925 | * task_tracer_task - return the task that is tracing the given task |
| 1926 | * @task: task to consider |
| 1927 | * |
| 1928 | * Returns NULL if noone is tracing @task, or the &struct task_struct |
| 1929 | * pointer to its tracer. |
| 1930 | * |
| 1931 | * Must be called under rcu_read_lock(). |
| 1932 | */ |
| 1933 | static struct task_struct *task_tracer_task(struct task_struct *task) |
| 1934 | { |
| 1935 | if (task->ptrace & PT_PTRACED) |
| 1936 | return rcu_dereference(task->parent); |
| 1937 | return NULL; |
| 1938 | } |
| 1939 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1940 | /* binprm security operations */ |
| 1941 | |
| 1942 | static int selinux_bprm_alloc_security(struct linux_binprm *bprm) |
| 1943 | { |
| 1944 | struct bprm_security_struct *bsec; |
| 1945 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 1946 | bsec = kzalloc(sizeof(struct bprm_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1947 | if (!bsec) |
| 1948 | return -ENOMEM; |
| 1949 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1950 | bsec->sid = SECINITSID_UNLABELED; |
| 1951 | bsec->set = 0; |
| 1952 | |
| 1953 | bprm->security = bsec; |
| 1954 | return 0; |
| 1955 | } |
| 1956 | |
| 1957 | static int selinux_bprm_set_security(struct linux_binprm *bprm) |
| 1958 | { |
| 1959 | struct task_security_struct *tsec; |
Josef Sipek | 3d5ff52 | 2006-12-08 02:37:38 -0800 | [diff] [blame] | 1960 | struct inode *inode = bprm->file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1961 | struct inode_security_struct *isec; |
| 1962 | struct bprm_security_struct *bsec; |
| 1963 | u32 newsid; |
| 1964 | struct avc_audit_data ad; |
| 1965 | int rc; |
| 1966 | |
| 1967 | rc = secondary_ops->bprm_set_security(bprm); |
| 1968 | if (rc) |
| 1969 | return rc; |
| 1970 | |
| 1971 | bsec = bprm->security; |
| 1972 | |
| 1973 | if (bsec->set) |
| 1974 | return 0; |
| 1975 | |
| 1976 | tsec = current->security; |
| 1977 | isec = inode->i_security; |
| 1978 | |
| 1979 | /* Default to the current task SID. */ |
| 1980 | bsec->sid = tsec->sid; |
| 1981 | |
Michael LeMay | 28eba5b | 2006-06-27 02:53:42 -0700 | [diff] [blame] | 1982 | /* Reset fs, key, and sock SIDs on execve. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1983 | tsec->create_sid = 0; |
Michael LeMay | 28eba5b | 2006-06-27 02:53:42 -0700 | [diff] [blame] | 1984 | tsec->keycreate_sid = 0; |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 1985 | tsec->sockcreate_sid = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1986 | |
| 1987 | if (tsec->exec_sid) { |
| 1988 | newsid = tsec->exec_sid; |
| 1989 | /* Reset exec SID on execve. */ |
| 1990 | tsec->exec_sid = 0; |
| 1991 | } else { |
| 1992 | /* Check for a default transition on this program. */ |
| 1993 | rc = security_transition_sid(tsec->sid, isec->sid, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1994 | SECCLASS_PROCESS, &newsid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1995 | if (rc) |
| 1996 | return rc; |
| 1997 | } |
| 1998 | |
| 1999 | AVC_AUDIT_DATA_INIT(&ad, FS); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 2000 | ad.u.fs.path = bprm->file->f_path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2001 | |
Josef Sipek | 3d5ff52 | 2006-12-08 02:37:38 -0800 | [diff] [blame] | 2002 | if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2003 | newsid = tsec->sid; |
| 2004 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2005 | if (tsec->sid == newsid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2006 | rc = avc_has_perm(tsec->sid, isec->sid, |
| 2007 | SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad); |
| 2008 | if (rc) |
| 2009 | return rc; |
| 2010 | } else { |
| 2011 | /* Check permissions for the transition. */ |
| 2012 | rc = avc_has_perm(tsec->sid, newsid, |
| 2013 | SECCLASS_PROCESS, PROCESS__TRANSITION, &ad); |
| 2014 | if (rc) |
| 2015 | return rc; |
| 2016 | |
| 2017 | rc = avc_has_perm(newsid, isec->sid, |
| 2018 | SECCLASS_FILE, FILE__ENTRYPOINT, &ad); |
| 2019 | if (rc) |
| 2020 | return rc; |
| 2021 | |
| 2022 | /* Clear any possibly unsafe personality bits on exec: */ |
| 2023 | current->personality &= ~PER_CLEAR_ON_SETID; |
| 2024 | |
| 2025 | /* Set the security field to the new SID. */ |
| 2026 | bsec->sid = newsid; |
| 2027 | } |
| 2028 | |
| 2029 | bsec->set = 1; |
| 2030 | return 0; |
| 2031 | } |
| 2032 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2033 | static int selinux_bprm_check_security(struct linux_binprm *bprm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2034 | { |
| 2035 | return secondary_ops->bprm_check_security(bprm); |
| 2036 | } |
| 2037 | |
| 2038 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2039 | static int selinux_bprm_secureexec(struct linux_binprm *bprm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2040 | { |
| 2041 | struct task_security_struct *tsec = current->security; |
| 2042 | int atsecure = 0; |
| 2043 | |
| 2044 | if (tsec->osid != tsec->sid) { |
| 2045 | /* Enable secure mode for SIDs transitions unless |
| 2046 | the noatsecure permission is granted between |
| 2047 | the two SIDs, i.e. ahp returns 0. */ |
| 2048 | atsecure = avc_has_perm(tsec->osid, tsec->sid, |
| 2049 | SECCLASS_PROCESS, |
| 2050 | PROCESS__NOATSECURE, NULL); |
| 2051 | } |
| 2052 | |
| 2053 | return (atsecure || secondary_ops->bprm_secureexec(bprm)); |
| 2054 | } |
| 2055 | |
| 2056 | static void selinux_bprm_free_security(struct linux_binprm *bprm) |
| 2057 | { |
Jesper Juhl | 9a5f04b | 2005-06-25 14:58:51 -0700 | [diff] [blame] | 2058 | kfree(bprm->security); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2059 | bprm->security = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2060 | } |
| 2061 | |
| 2062 | extern struct vfsmount *selinuxfs_mount; |
| 2063 | extern struct dentry *selinux_null; |
| 2064 | |
| 2065 | /* Derived from fs/exec.c:flush_old_files. */ |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2066 | static inline void flush_unauthorized_files(struct files_struct *files) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2067 | { |
| 2068 | struct avc_audit_data ad; |
| 2069 | struct file *file, *devnull = NULL; |
Stephen Smalley | b20c812 | 2006-09-25 23:32:03 -0700 | [diff] [blame] | 2070 | struct tty_struct *tty; |
Dipankar Sarma | badf166 | 2005-09-09 13:04:10 -0700 | [diff] [blame] | 2071 | struct fdtable *fdt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2072 | long j = -1; |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 2073 | int drop_tty = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2074 | |
Stephen Smalley | b20c812 | 2006-09-25 23:32:03 -0700 | [diff] [blame] | 2075 | mutex_lock(&tty_mutex); |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 2076 | tty = get_current_tty(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2077 | if (tty) { |
| 2078 | file_list_lock(); |
Eric Dumazet | 2f51201 | 2005-10-30 15:02:16 -0800 | [diff] [blame] | 2079 | file = list_entry(tty->tty_files.next, typeof(*file), f_u.fu_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2080 | if (file) { |
| 2081 | /* Revalidate access to controlling tty. |
| 2082 | Use inode_has_perm on the tty inode directly rather |
| 2083 | than using file_has_perm, as this particular open |
| 2084 | file may belong to another process and we are only |
| 2085 | interested in the inode-based check here. */ |
Josef Sipek | 3d5ff52 | 2006-12-08 02:37:38 -0800 | [diff] [blame] | 2086 | struct inode *inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2087 | if (inode_has_perm(current, inode, |
| 2088 | FILE__READ | FILE__WRITE, NULL)) { |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 2089 | drop_tty = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2090 | } |
| 2091 | } |
| 2092 | file_list_unlock(); |
| 2093 | } |
Stephen Smalley | b20c812 | 2006-09-25 23:32:03 -0700 | [diff] [blame] | 2094 | mutex_unlock(&tty_mutex); |
Eric W. Biederman | 98a27ba | 2007-05-08 00:26:56 -0700 | [diff] [blame] | 2095 | /* Reset controlling tty. */ |
| 2096 | if (drop_tty) |
| 2097 | no_tty(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2098 | |
| 2099 | /* Revalidate access to inherited open files. */ |
| 2100 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2101 | AVC_AUDIT_DATA_INIT(&ad, FS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2102 | |
| 2103 | spin_lock(&files->file_lock); |
| 2104 | for (;;) { |
| 2105 | unsigned long set, i; |
| 2106 | int fd; |
| 2107 | |
| 2108 | j++; |
| 2109 | i = j * __NFDBITS; |
Dipankar Sarma | badf166 | 2005-09-09 13:04:10 -0700 | [diff] [blame] | 2110 | fdt = files_fdtable(files); |
Vadim Lobanov | bbea9f6 | 2006-12-10 02:21:12 -0800 | [diff] [blame] | 2111 | if (i >= fdt->max_fds) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2112 | break; |
Dipankar Sarma | badf166 | 2005-09-09 13:04:10 -0700 | [diff] [blame] | 2113 | set = fdt->open_fds->fds_bits[j]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2114 | if (!set) |
| 2115 | continue; |
| 2116 | spin_unlock(&files->file_lock); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2117 | for ( ; set ; i++, set >>= 1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2118 | if (set & 1) { |
| 2119 | file = fget(i); |
| 2120 | if (!file) |
| 2121 | continue; |
| 2122 | if (file_has_perm(current, |
| 2123 | file, |
| 2124 | file_to_av(file))) { |
| 2125 | sys_close(i); |
| 2126 | fd = get_unused_fd(); |
| 2127 | if (fd != i) { |
| 2128 | if (fd >= 0) |
| 2129 | put_unused_fd(fd); |
| 2130 | fput(file); |
| 2131 | continue; |
| 2132 | } |
| 2133 | if (devnull) { |
Nick Piggin | 095975d | 2006-01-08 01:02:19 -0800 | [diff] [blame] | 2134 | get_file(devnull); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2135 | } else { |
| 2136 | devnull = dentry_open(dget(selinux_null), mntget(selinuxfs_mount), O_RDWR); |
Akinobu Mita | fc5d81e | 2006-11-27 15:16:48 +0900 | [diff] [blame] | 2137 | if (IS_ERR(devnull)) { |
| 2138 | devnull = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2139 | put_unused_fd(fd); |
| 2140 | fput(file); |
| 2141 | continue; |
| 2142 | } |
| 2143 | } |
| 2144 | fd_install(fd, devnull); |
| 2145 | } |
| 2146 | fput(file); |
| 2147 | } |
| 2148 | } |
| 2149 | spin_lock(&files->file_lock); |
| 2150 | |
| 2151 | } |
| 2152 | spin_unlock(&files->file_lock); |
| 2153 | } |
| 2154 | |
| 2155 | static void selinux_bprm_apply_creds(struct linux_binprm *bprm, int unsafe) |
| 2156 | { |
| 2157 | struct task_security_struct *tsec; |
| 2158 | struct bprm_security_struct *bsec; |
| 2159 | u32 sid; |
| 2160 | int rc; |
| 2161 | |
| 2162 | secondary_ops->bprm_apply_creds(bprm, unsafe); |
| 2163 | |
| 2164 | tsec = current->security; |
| 2165 | |
| 2166 | bsec = bprm->security; |
| 2167 | sid = bsec->sid; |
| 2168 | |
| 2169 | tsec->osid = tsec->sid; |
| 2170 | bsec->unsafe = 0; |
| 2171 | if (tsec->sid != sid) { |
| 2172 | /* Check for shared state. If not ok, leave SID |
| 2173 | unchanged and kill. */ |
| 2174 | if (unsafe & LSM_UNSAFE_SHARE) { |
| 2175 | rc = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS, |
| 2176 | PROCESS__SHARE, NULL); |
| 2177 | if (rc) { |
| 2178 | bsec->unsafe = 1; |
| 2179 | return; |
| 2180 | } |
| 2181 | } |
| 2182 | |
| 2183 | /* Check for ptracing, and update the task SID if ok. |
| 2184 | Otherwise, leave SID unchanged and kill. */ |
| 2185 | if (unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) { |
Roland McGrath | 0356357 | 2008-03-26 15:46:39 -0700 | [diff] [blame] | 2186 | struct task_struct *tracer; |
| 2187 | struct task_security_struct *sec; |
| 2188 | u32 ptsid = 0; |
| 2189 | |
| 2190 | rcu_read_lock(); |
| 2191 | tracer = task_tracer_task(current); |
| 2192 | if (likely(tracer != NULL)) { |
| 2193 | sec = tracer->security; |
| 2194 | ptsid = sec->sid; |
| 2195 | } |
| 2196 | rcu_read_unlock(); |
| 2197 | |
| 2198 | if (ptsid != 0) { |
| 2199 | rc = avc_has_perm(ptsid, sid, SECCLASS_PROCESS, |
| 2200 | PROCESS__PTRACE, NULL); |
| 2201 | if (rc) { |
| 2202 | bsec->unsafe = 1; |
| 2203 | return; |
| 2204 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2205 | } |
| 2206 | } |
| 2207 | tsec->sid = sid; |
| 2208 | } |
| 2209 | } |
| 2210 | |
| 2211 | /* |
| 2212 | * called after apply_creds without the task lock held |
| 2213 | */ |
| 2214 | static void selinux_bprm_post_apply_creds(struct linux_binprm *bprm) |
| 2215 | { |
| 2216 | struct task_security_struct *tsec; |
| 2217 | struct rlimit *rlim, *initrlim; |
| 2218 | struct itimerval itimer; |
| 2219 | struct bprm_security_struct *bsec; |
| 2220 | int rc, i; |
| 2221 | |
| 2222 | tsec = current->security; |
| 2223 | bsec = bprm->security; |
| 2224 | |
| 2225 | if (bsec->unsafe) { |
| 2226 | force_sig_specific(SIGKILL, current); |
| 2227 | return; |
| 2228 | } |
| 2229 | if (tsec->osid == tsec->sid) |
| 2230 | return; |
| 2231 | |
| 2232 | /* Close files for which the new task SID is not authorized. */ |
| 2233 | flush_unauthorized_files(current->files); |
| 2234 | |
| 2235 | /* Check whether the new SID can inherit signal state |
| 2236 | from the old SID. If not, clear itimers to avoid |
| 2237 | subsequent signal generation and flush and unblock |
| 2238 | signals. This must occur _after_ the task SID has |
| 2239 | been updated so that any kill done after the flush |
| 2240 | will be checked against the new SID. */ |
| 2241 | rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS, |
| 2242 | PROCESS__SIGINH, NULL); |
| 2243 | if (rc) { |
| 2244 | memset(&itimer, 0, sizeof itimer); |
| 2245 | for (i = 0; i < 3; i++) |
| 2246 | do_setitimer(i, &itimer, NULL); |
| 2247 | flush_signals(current); |
| 2248 | spin_lock_irq(¤t->sighand->siglock); |
| 2249 | flush_signal_handlers(current, 1); |
| 2250 | sigemptyset(¤t->blocked); |
| 2251 | recalc_sigpending(); |
| 2252 | spin_unlock_irq(¤t->sighand->siglock); |
| 2253 | } |
| 2254 | |
Stephen Smalley | 4ac212a | 2007-08-29 08:51:50 -0400 | [diff] [blame] | 2255 | /* Always clear parent death signal on SID transitions. */ |
| 2256 | current->pdeath_signal = 0; |
| 2257 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2258 | /* Check whether the new SID can inherit resource limits |
| 2259 | from the old SID. If not, reset all soft limits to |
| 2260 | the lower of the current task's hard limit and the init |
| 2261 | task's soft limit. Note that the setting of hard limits |
| 2262 | (even to lower them) can be controlled by the setrlimit |
| 2263 | check. The inclusion of the init task's soft limit into |
| 2264 | the computation is to avoid resetting soft limits higher |
| 2265 | than the default soft limit for cases where the default |
| 2266 | is lower than the hard limit, e.g. RLIMIT_CORE or |
| 2267 | RLIMIT_STACK.*/ |
| 2268 | rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS, |
| 2269 | PROCESS__RLIMITINH, NULL); |
| 2270 | if (rc) { |
| 2271 | for (i = 0; i < RLIM_NLIMITS; i++) { |
| 2272 | rlim = current->signal->rlim + i; |
| 2273 | initrlim = init_task.signal->rlim+i; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2274 | rlim->rlim_cur = min(rlim->rlim_max, initrlim->rlim_cur); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2275 | } |
| 2276 | if (current->signal->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY) { |
| 2277 | /* |
| 2278 | * This will cause RLIMIT_CPU calculations |
| 2279 | * to be refigured. |
| 2280 | */ |
| 2281 | current->it_prof_expires = jiffies_to_cputime(1); |
| 2282 | } |
| 2283 | } |
| 2284 | |
| 2285 | /* Wake up the parent if it is waiting so that it can |
| 2286 | recheck wait permission to the new task SID. */ |
| 2287 | wake_up_interruptible(¤t->parent->signal->wait_chldexit); |
| 2288 | } |
| 2289 | |
| 2290 | /* superblock security operations */ |
| 2291 | |
| 2292 | static int selinux_sb_alloc_security(struct super_block *sb) |
| 2293 | { |
| 2294 | return superblock_alloc_security(sb); |
| 2295 | } |
| 2296 | |
| 2297 | static void selinux_sb_free_security(struct super_block *sb) |
| 2298 | { |
| 2299 | superblock_free_security(sb); |
| 2300 | } |
| 2301 | |
| 2302 | static inline int match_prefix(char *prefix, int plen, char *option, int olen) |
| 2303 | { |
| 2304 | if (plen > olen) |
| 2305 | return 0; |
| 2306 | |
| 2307 | return !memcmp(prefix, option, plen); |
| 2308 | } |
| 2309 | |
| 2310 | static inline int selinux_option(char *option, int len) |
| 2311 | { |
Eric Paris | 832cbd9 | 2008-04-01 13:24:09 -0400 | [diff] [blame] | 2312 | return (match_prefix(CONTEXT_STR, sizeof(CONTEXT_STR)-1, option, len) || |
| 2313 | match_prefix(FSCONTEXT_STR, sizeof(FSCONTEXT_STR)-1, option, len) || |
| 2314 | match_prefix(DEFCONTEXT_STR, sizeof(DEFCONTEXT_STR)-1, option, len) || |
| 2315 | match_prefix(ROOTCONTEXT_STR, sizeof(ROOTCONTEXT_STR)-1, option, len)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2316 | } |
| 2317 | |
| 2318 | static inline void take_option(char **to, char *from, int *first, int len) |
| 2319 | { |
| 2320 | if (!*first) { |
| 2321 | **to = ','; |
| 2322 | *to += 1; |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2323 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2324 | *first = 0; |
| 2325 | memcpy(*to, from, len); |
| 2326 | *to += len; |
| 2327 | } |
| 2328 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2329 | static inline void take_selinux_option(char **to, char *from, int *first, |
| 2330 | int len) |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2331 | { |
| 2332 | int current_size = 0; |
| 2333 | |
| 2334 | if (!*first) { |
| 2335 | **to = '|'; |
| 2336 | *to += 1; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2337 | } else |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2338 | *first = 0; |
| 2339 | |
| 2340 | while (current_size < len) { |
| 2341 | if (*from != '"') { |
| 2342 | **to = *from; |
| 2343 | *to += 1; |
| 2344 | } |
| 2345 | from += 1; |
| 2346 | current_size += 1; |
| 2347 | } |
| 2348 | } |
| 2349 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 2350 | static int selinux_sb_copy_data(char *orig, char *copy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2351 | { |
| 2352 | int fnosec, fsec, rc = 0; |
| 2353 | char *in_save, *in_curr, *in_end; |
| 2354 | char *sec_curr, *nosec_save, *nosec; |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2355 | int open_quote = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2356 | |
| 2357 | in_curr = orig; |
| 2358 | sec_curr = copy; |
| 2359 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2360 | nosec = (char *)get_zeroed_page(GFP_KERNEL); |
| 2361 | if (!nosec) { |
| 2362 | rc = -ENOMEM; |
| 2363 | goto out; |
| 2364 | } |
| 2365 | |
| 2366 | nosec_save = nosec; |
| 2367 | fnosec = fsec = 1; |
| 2368 | in_save = in_end = orig; |
| 2369 | |
| 2370 | do { |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2371 | if (*in_end == '"') |
| 2372 | open_quote = !open_quote; |
| 2373 | if ((*in_end == ',' && open_quote == 0) || |
| 2374 | *in_end == '\0') { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2375 | int len = in_end - in_curr; |
| 2376 | |
| 2377 | if (selinux_option(in_curr, len)) |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2378 | take_selinux_option(&sec_curr, in_curr, &fsec, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2379 | else |
| 2380 | take_option(&nosec, in_curr, &fnosec, len); |
| 2381 | |
| 2382 | in_curr = in_end + 1; |
| 2383 | } |
| 2384 | } while (*in_end++); |
| 2385 | |
Eric Paris | 6931dfc | 2005-06-30 02:58:51 -0700 | [diff] [blame] | 2386 | strcpy(in_save, nosec_save); |
Gerald Schaefer | da3caa2 | 2005-06-21 17:15:18 -0700 | [diff] [blame] | 2387 | free_page((unsigned long)nosec_save); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2388 | out: |
| 2389 | return rc; |
| 2390 | } |
| 2391 | |
| 2392 | static int selinux_sb_kern_mount(struct super_block *sb, void *data) |
| 2393 | { |
| 2394 | struct avc_audit_data ad; |
| 2395 | int rc; |
| 2396 | |
| 2397 | rc = superblock_doinit(sb, data); |
| 2398 | if (rc) |
| 2399 | return rc; |
| 2400 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2401 | AVC_AUDIT_DATA_INIT(&ad, FS); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 2402 | ad.u.fs.path.dentry = sb->s_root; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2403 | return superblock_has_perm(current, sb, FILESYSTEM__MOUNT, &ad); |
| 2404 | } |
| 2405 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 2406 | static int selinux_sb_statfs(struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2407 | { |
| 2408 | struct avc_audit_data ad; |
| 2409 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2410 | AVC_AUDIT_DATA_INIT(&ad, FS); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 2411 | ad.u.fs.path.dentry = dentry->d_sb->s_root; |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 2412 | return superblock_has_perm(current, dentry->d_sb, FILESYSTEM__GETATTR, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2413 | } |
| 2414 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2415 | static int selinux_mount(char *dev_name, |
Al Viro | b5266eb | 2008-03-22 17:48:24 -0400 | [diff] [blame] | 2416 | struct path *path, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2417 | char *type, |
| 2418 | unsigned long flags, |
| 2419 | void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2420 | { |
| 2421 | int rc; |
| 2422 | |
Al Viro | b5266eb | 2008-03-22 17:48:24 -0400 | [diff] [blame] | 2423 | rc = secondary_ops->sb_mount(dev_name, path, type, flags, data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2424 | if (rc) |
| 2425 | return rc; |
| 2426 | |
| 2427 | if (flags & MS_REMOUNT) |
Al Viro | b5266eb | 2008-03-22 17:48:24 -0400 | [diff] [blame] | 2428 | return superblock_has_perm(current, path->mnt->mnt_sb, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2429 | FILESYSTEM__REMOUNT, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2430 | else |
Al Viro | b5266eb | 2008-03-22 17:48:24 -0400 | [diff] [blame] | 2431 | return dentry_has_perm(current, path->mnt, path->dentry, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2432 | FILE__MOUNTON); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2433 | } |
| 2434 | |
| 2435 | static int selinux_umount(struct vfsmount *mnt, int flags) |
| 2436 | { |
| 2437 | int rc; |
| 2438 | |
| 2439 | rc = secondary_ops->sb_umount(mnt, flags); |
| 2440 | if (rc) |
| 2441 | return rc; |
| 2442 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2443 | return superblock_has_perm(current, mnt->mnt_sb, |
| 2444 | FILESYSTEM__UNMOUNT, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2445 | } |
| 2446 | |
| 2447 | /* inode security operations */ |
| 2448 | |
| 2449 | static int selinux_inode_alloc_security(struct inode *inode) |
| 2450 | { |
| 2451 | return inode_alloc_security(inode); |
| 2452 | } |
| 2453 | |
| 2454 | static void selinux_inode_free_security(struct inode *inode) |
| 2455 | { |
| 2456 | inode_free_security(inode); |
| 2457 | } |
| 2458 | |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2459 | static int selinux_inode_init_security(struct inode *inode, struct inode *dir, |
| 2460 | char **name, void **value, |
| 2461 | size_t *len) |
| 2462 | { |
| 2463 | struct task_security_struct *tsec; |
| 2464 | struct inode_security_struct *dsec; |
| 2465 | struct superblock_security_struct *sbsec; |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 2466 | u32 newsid, clen; |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2467 | int rc; |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 2468 | char *namep = NULL, *context; |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2469 | |
| 2470 | tsec = current->security; |
| 2471 | dsec = dir->i_security; |
| 2472 | sbsec = dir->i_sb->s_security; |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2473 | |
| 2474 | if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) { |
| 2475 | newsid = tsec->create_sid; |
| 2476 | } else { |
| 2477 | rc = security_transition_sid(tsec->sid, dsec->sid, |
| 2478 | inode_mode_to_security_class(inode->i_mode), |
| 2479 | &newsid); |
| 2480 | if (rc) { |
| 2481 | printk(KERN_WARNING "%s: " |
| 2482 | "security_transition_sid failed, rc=%d (dev=%s " |
| 2483 | "ino=%ld)\n", |
Harvey Harrison | dd6f953 | 2008-03-06 10:03:59 +1100 | [diff] [blame] | 2484 | __func__, |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2485 | -rc, inode->i_sb->s_id, inode->i_ino); |
| 2486 | return rc; |
| 2487 | } |
| 2488 | } |
| 2489 | |
Eric Paris | 296fddf | 2006-09-25 23:32:00 -0700 | [diff] [blame] | 2490 | /* Possibly defer initialization to selinux_complete_init. */ |
| 2491 | if (sbsec->initialized) { |
| 2492 | struct inode_security_struct *isec = inode->i_security; |
| 2493 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
| 2494 | isec->sid = newsid; |
| 2495 | isec->initialized = 1; |
| 2496 | } |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2497 | |
Stephen Smalley | 8aad387 | 2006-03-22 00:09:13 -0800 | [diff] [blame] | 2498 | if (!ss_initialized || sbsec->behavior == SECURITY_FS_USE_MNTPOINT) |
Stephen Smalley | 25a74f3 | 2005-11-08 21:34:33 -0800 | [diff] [blame] | 2499 | return -EOPNOTSUPP; |
| 2500 | |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 2501 | if (name) { |
Josef Bacik | a02fe13 | 2008-04-04 09:35:05 +1100 | [diff] [blame] | 2502 | namep = kstrdup(XATTR_SELINUX_SUFFIX, GFP_NOFS); |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 2503 | if (!namep) |
| 2504 | return -ENOMEM; |
| 2505 | *name = namep; |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2506 | } |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 2507 | |
| 2508 | if (value && len) { |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 2509 | rc = security_sid_to_context_force(newsid, &context, &clen); |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 2510 | if (rc) { |
| 2511 | kfree(namep); |
| 2512 | return rc; |
| 2513 | } |
| 2514 | *value = context; |
| 2515 | *len = clen; |
| 2516 | } |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2517 | |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2518 | return 0; |
| 2519 | } |
| 2520 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2521 | static int selinux_inode_create(struct inode *dir, struct dentry *dentry, int mask) |
| 2522 | { |
| 2523 | return may_create(dir, dentry, SECCLASS_FILE); |
| 2524 | } |
| 2525 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2526 | static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry) |
| 2527 | { |
| 2528 | int rc; |
| 2529 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2530 | rc = secondary_ops->inode_link(old_dentry, dir, new_dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2531 | if (rc) |
| 2532 | return rc; |
| 2533 | return may_link(dir, old_dentry, MAY_LINK); |
| 2534 | } |
| 2535 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2536 | static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry) |
| 2537 | { |
| 2538 | int rc; |
| 2539 | |
| 2540 | rc = secondary_ops->inode_unlink(dir, dentry); |
| 2541 | if (rc) |
| 2542 | return rc; |
| 2543 | return may_link(dir, dentry, MAY_UNLINK); |
| 2544 | } |
| 2545 | |
| 2546 | static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const char *name) |
| 2547 | { |
| 2548 | return may_create(dir, dentry, SECCLASS_LNK_FILE); |
| 2549 | } |
| 2550 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2551 | static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, int mask) |
| 2552 | { |
| 2553 | return may_create(dir, dentry, SECCLASS_DIR); |
| 2554 | } |
| 2555 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2556 | static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry) |
| 2557 | { |
| 2558 | return may_link(dir, dentry, MAY_RMDIR); |
| 2559 | } |
| 2560 | |
| 2561 | static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) |
| 2562 | { |
| 2563 | int rc; |
| 2564 | |
| 2565 | rc = secondary_ops->inode_mknod(dir, dentry, mode, dev); |
| 2566 | if (rc) |
| 2567 | return rc; |
| 2568 | |
| 2569 | return may_create(dir, dentry, inode_mode_to_security_class(mode)); |
| 2570 | } |
| 2571 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2572 | 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] | 2573 | struct inode *new_inode, struct dentry *new_dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2574 | { |
| 2575 | return may_rename(old_inode, old_dentry, new_inode, new_dentry); |
| 2576 | } |
| 2577 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2578 | static int selinux_inode_readlink(struct dentry *dentry) |
| 2579 | { |
| 2580 | return dentry_has_perm(current, NULL, dentry, FILE__READ); |
| 2581 | } |
| 2582 | |
| 2583 | static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *nameidata) |
| 2584 | { |
| 2585 | int rc; |
| 2586 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2587 | rc = secondary_ops->inode_follow_link(dentry, nameidata); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2588 | if (rc) |
| 2589 | return rc; |
| 2590 | return dentry_has_perm(current, NULL, dentry, FILE__READ); |
| 2591 | } |
| 2592 | |
| 2593 | static int selinux_inode_permission(struct inode *inode, int mask, |
| 2594 | struct nameidata *nd) |
| 2595 | { |
| 2596 | int rc; |
| 2597 | |
| 2598 | rc = secondary_ops->inode_permission(inode, mask, nd); |
| 2599 | if (rc) |
| 2600 | return rc; |
| 2601 | |
| 2602 | if (!mask) { |
| 2603 | /* No permission to check. Existence test. */ |
| 2604 | return 0; |
| 2605 | } |
| 2606 | |
| 2607 | return inode_has_perm(current, inode, |
Eric Paris | b0c636b | 2008-02-28 12:58:40 -0500 | [diff] [blame] | 2608 | open_file_mask_to_av(inode->i_mode, mask), NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2609 | } |
| 2610 | |
| 2611 | static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr) |
| 2612 | { |
| 2613 | int rc; |
| 2614 | |
| 2615 | rc = secondary_ops->inode_setattr(dentry, iattr); |
| 2616 | if (rc) |
| 2617 | return rc; |
| 2618 | |
| 2619 | if (iattr->ia_valid & ATTR_FORCE) |
| 2620 | return 0; |
| 2621 | |
| 2622 | if (iattr->ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | |
| 2623 | ATTR_ATIME_SET | ATTR_MTIME_SET)) |
| 2624 | return dentry_has_perm(current, NULL, dentry, FILE__SETATTR); |
| 2625 | |
| 2626 | return dentry_has_perm(current, NULL, dentry, FILE__WRITE); |
| 2627 | } |
| 2628 | |
| 2629 | static int selinux_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) |
| 2630 | { |
| 2631 | return dentry_has_perm(current, mnt, dentry, FILE__GETATTR); |
| 2632 | } |
| 2633 | |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 2634 | static int selinux_inode_setotherxattr(struct dentry *dentry, const char *name) |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 2635 | { |
| 2636 | if (!strncmp(name, XATTR_SECURITY_PREFIX, |
| 2637 | sizeof XATTR_SECURITY_PREFIX - 1)) { |
| 2638 | if (!strcmp(name, XATTR_NAME_CAPS)) { |
| 2639 | if (!capable(CAP_SETFCAP)) |
| 2640 | return -EPERM; |
| 2641 | } else if (!capable(CAP_SYS_ADMIN)) { |
| 2642 | /* A different attribute in the security namespace. |
| 2643 | Restrict to administrator. */ |
| 2644 | return -EPERM; |
| 2645 | } |
| 2646 | } |
| 2647 | |
| 2648 | /* Not an attribute we recognize, so just check the |
| 2649 | ordinary setattr permission. */ |
| 2650 | return dentry_has_perm(current, NULL, dentry, FILE__SETATTR); |
| 2651 | } |
| 2652 | |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 2653 | static int selinux_inode_setxattr(struct dentry *dentry, const char *name, |
| 2654 | const void *value, size_t size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2655 | { |
| 2656 | struct task_security_struct *tsec = current->security; |
| 2657 | struct inode *inode = dentry->d_inode; |
| 2658 | struct inode_security_struct *isec = inode->i_security; |
| 2659 | struct superblock_security_struct *sbsec; |
| 2660 | struct avc_audit_data ad; |
| 2661 | u32 newsid; |
| 2662 | int rc = 0; |
| 2663 | |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 2664 | if (strcmp(name, XATTR_NAME_SELINUX)) |
| 2665 | return selinux_inode_setotherxattr(dentry, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2666 | |
| 2667 | sbsec = inode->i_sb->s_security; |
| 2668 | if (sbsec->behavior == SECURITY_FS_USE_MNTPOINT) |
| 2669 | return -EOPNOTSUPP; |
| 2670 | |
Satyam Sharma | 3bd858a | 2007-07-17 15:00:08 +0530 | [diff] [blame] | 2671 | if (!is_owner_or_cap(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2672 | return -EPERM; |
| 2673 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2674 | AVC_AUDIT_DATA_INIT(&ad, FS); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 2675 | ad.u.fs.path.dentry = dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2676 | |
| 2677 | rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass, |
| 2678 | FILE__RELABELFROM, &ad); |
| 2679 | if (rc) |
| 2680 | return rc; |
| 2681 | |
| 2682 | rc = security_context_to_sid(value, size, &newsid); |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 2683 | if (rc == -EINVAL) { |
| 2684 | if (!capable(CAP_MAC_ADMIN)) |
| 2685 | return rc; |
| 2686 | rc = security_context_to_sid_force(value, size, &newsid); |
| 2687 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2688 | if (rc) |
| 2689 | return rc; |
| 2690 | |
| 2691 | rc = avc_has_perm(tsec->sid, newsid, isec->sclass, |
| 2692 | FILE__RELABELTO, &ad); |
| 2693 | if (rc) |
| 2694 | return rc; |
| 2695 | |
| 2696 | rc = security_validate_transition(isec->sid, newsid, tsec->sid, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2697 | isec->sclass); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2698 | if (rc) |
| 2699 | return rc; |
| 2700 | |
| 2701 | return avc_has_perm(newsid, |
| 2702 | sbsec->sid, |
| 2703 | SECCLASS_FILESYSTEM, |
| 2704 | FILESYSTEM__ASSOCIATE, |
| 2705 | &ad); |
| 2706 | } |
| 2707 | |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 2708 | static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name, |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 2709 | const void *value, size_t size, |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 2710 | int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2711 | { |
| 2712 | struct inode *inode = dentry->d_inode; |
| 2713 | struct inode_security_struct *isec = inode->i_security; |
| 2714 | u32 newsid; |
| 2715 | int rc; |
| 2716 | |
| 2717 | if (strcmp(name, XATTR_NAME_SELINUX)) { |
| 2718 | /* Not an attribute we recognize, so nothing to do. */ |
| 2719 | return; |
| 2720 | } |
| 2721 | |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 2722 | rc = security_context_to_sid_force(value, size, &newsid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2723 | if (rc) { |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 2724 | printk(KERN_ERR "SELinux: unable to map context to SID" |
| 2725 | "for (%s, %lu), rc=%d\n", |
| 2726 | inode->i_sb->s_id, inode->i_ino, -rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2727 | return; |
| 2728 | } |
| 2729 | |
| 2730 | isec->sid = newsid; |
| 2731 | return; |
| 2732 | } |
| 2733 | |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 2734 | static int selinux_inode_getxattr(struct dentry *dentry, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2735 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2736 | return dentry_has_perm(current, NULL, dentry, FILE__GETATTR); |
| 2737 | } |
| 2738 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2739 | static int selinux_inode_listxattr(struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2740 | { |
| 2741 | return dentry_has_perm(current, NULL, dentry, FILE__GETATTR); |
| 2742 | } |
| 2743 | |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 2744 | static int selinux_inode_removexattr(struct dentry *dentry, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2745 | { |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 2746 | if (strcmp(name, XATTR_NAME_SELINUX)) |
| 2747 | return selinux_inode_setotherxattr(dentry, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2748 | |
| 2749 | /* No one is allowed to remove a SELinux security label. |
| 2750 | You can change the label, but all data must be labeled. */ |
| 2751 | return -EACCES; |
| 2752 | } |
| 2753 | |
James Morris | d381d8a | 2005-10-30 14:59:22 -0800 | [diff] [blame] | 2754 | /* |
Stephen Smalley | abc69bb | 2008-05-21 14:16:12 -0400 | [diff] [blame] | 2755 | * Copy the inode security context value to the user. |
James Morris | d381d8a | 2005-10-30 14:59:22 -0800 | [diff] [blame] | 2756 | * |
| 2757 | * Permission check is handled by selinux_inode_getxattr hook. |
| 2758 | */ |
David P. Quigley | 4249259 | 2008-02-04 22:29:39 -0800 | [diff] [blame] | 2759 | 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] | 2760 | { |
David P. Quigley | 4249259 | 2008-02-04 22:29:39 -0800 | [diff] [blame] | 2761 | u32 size; |
| 2762 | int error; |
| 2763 | char *context = NULL; |
Stephen Smalley | abc69bb | 2008-05-21 14:16:12 -0400 | [diff] [blame] | 2764 | struct task_security_struct *tsec = current->security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2765 | struct inode_security_struct *isec = inode->i_security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2766 | |
Dustin Kirkland | 8c8570f | 2005-11-03 17:15:16 +0000 | [diff] [blame] | 2767 | if (strcmp(name, XATTR_SELINUX_SUFFIX)) |
| 2768 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2769 | |
Stephen Smalley | abc69bb | 2008-05-21 14:16:12 -0400 | [diff] [blame] | 2770 | /* |
| 2771 | * If the caller has CAP_MAC_ADMIN, then get the raw context |
| 2772 | * value even if it is not defined by current policy; otherwise, |
| 2773 | * use the in-core value under current policy. |
| 2774 | * Use the non-auditing forms of the permission checks since |
| 2775 | * getxattr may be called by unprivileged processes commonly |
| 2776 | * and lack of permission just means that we fall back to the |
| 2777 | * in-core context value, not a denial. |
| 2778 | */ |
| 2779 | error = secondary_ops->capable(current, CAP_MAC_ADMIN); |
| 2780 | if (!error) |
| 2781 | error = avc_has_perm_noaudit(tsec->sid, tsec->sid, |
| 2782 | SECCLASS_CAPABILITY2, |
| 2783 | CAPABILITY2__MAC_ADMIN, |
| 2784 | 0, |
| 2785 | NULL); |
| 2786 | if (!error) |
| 2787 | error = security_sid_to_context_force(isec->sid, &context, |
| 2788 | &size); |
| 2789 | else |
| 2790 | error = security_sid_to_context(isec->sid, &context, &size); |
David P. Quigley | 4249259 | 2008-02-04 22:29:39 -0800 | [diff] [blame] | 2791 | if (error) |
| 2792 | return error; |
| 2793 | error = size; |
| 2794 | if (alloc) { |
| 2795 | *buffer = context; |
| 2796 | goto out_nofree; |
| 2797 | } |
| 2798 | kfree(context); |
| 2799 | out_nofree: |
| 2800 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2801 | } |
| 2802 | |
| 2803 | static int selinux_inode_setsecurity(struct inode *inode, const char *name, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2804 | const void *value, size_t size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2805 | { |
| 2806 | struct inode_security_struct *isec = inode->i_security; |
| 2807 | u32 newsid; |
| 2808 | int rc; |
| 2809 | |
| 2810 | if (strcmp(name, XATTR_SELINUX_SUFFIX)) |
| 2811 | return -EOPNOTSUPP; |
| 2812 | |
| 2813 | if (!value || !size) |
| 2814 | return -EACCES; |
| 2815 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2816 | rc = security_context_to_sid((void *)value, size, &newsid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2817 | if (rc) |
| 2818 | return rc; |
| 2819 | |
| 2820 | isec->sid = newsid; |
| 2821 | return 0; |
| 2822 | } |
| 2823 | |
| 2824 | static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size) |
| 2825 | { |
| 2826 | const int len = sizeof(XATTR_NAME_SELINUX); |
| 2827 | if (buffer && len <= buffer_size) |
| 2828 | memcpy(buffer, XATTR_NAME_SELINUX, len); |
| 2829 | return len; |
| 2830 | } |
| 2831 | |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 2832 | static int selinux_inode_need_killpriv(struct dentry *dentry) |
| 2833 | { |
| 2834 | return secondary_ops->inode_need_killpriv(dentry); |
| 2835 | } |
| 2836 | |
| 2837 | static int selinux_inode_killpriv(struct dentry *dentry) |
| 2838 | { |
| 2839 | return secondary_ops->inode_killpriv(dentry); |
| 2840 | } |
| 2841 | |
Ahmed S. Darwish | 713a04ae | 2008-03-01 21:52:30 +0200 | [diff] [blame] | 2842 | static void selinux_inode_getsecid(const struct inode *inode, u32 *secid) |
| 2843 | { |
| 2844 | struct inode_security_struct *isec = inode->i_security; |
| 2845 | *secid = isec->sid; |
| 2846 | } |
| 2847 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2848 | /* file security operations */ |
| 2849 | |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 2850 | static int selinux_revalidate_file_permission(struct file *file, int mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2851 | { |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 2852 | int rc; |
Josef Sipek | 3d5ff52 | 2006-12-08 02:37:38 -0800 | [diff] [blame] | 2853 | struct inode *inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2854 | |
| 2855 | if (!mask) { |
| 2856 | /* No permission to check. Existence test. */ |
| 2857 | return 0; |
| 2858 | } |
| 2859 | |
| 2860 | /* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */ |
| 2861 | if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE)) |
| 2862 | mask |= MAY_APPEND; |
| 2863 | |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 2864 | rc = file_has_perm(current, file, |
| 2865 | file_mask_to_av(inode->i_mode, mask)); |
| 2866 | if (rc) |
| 2867 | return rc; |
| 2868 | |
| 2869 | return selinux_netlbl_inode_permission(inode, mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2870 | } |
| 2871 | |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 2872 | static int selinux_file_permission(struct file *file, int mask) |
| 2873 | { |
| 2874 | struct inode *inode = file->f_path.dentry->d_inode; |
| 2875 | struct task_security_struct *tsec = current->security; |
| 2876 | struct file_security_struct *fsec = file->f_security; |
| 2877 | struct inode_security_struct *isec = inode->i_security; |
| 2878 | |
| 2879 | if (!mask) { |
| 2880 | /* No permission to check. Existence test. */ |
| 2881 | return 0; |
| 2882 | } |
| 2883 | |
| 2884 | if (tsec->sid == fsec->sid && fsec->isid == isec->sid |
| 2885 | && fsec->pseqno == avc_policy_seqno()) |
| 2886 | return selinux_netlbl_inode_permission(inode, mask); |
| 2887 | |
| 2888 | return selinux_revalidate_file_permission(file, mask); |
| 2889 | } |
| 2890 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2891 | static int selinux_file_alloc_security(struct file *file) |
| 2892 | { |
| 2893 | return file_alloc_security(file); |
| 2894 | } |
| 2895 | |
| 2896 | static void selinux_file_free_security(struct file *file) |
| 2897 | { |
| 2898 | file_free_security(file); |
| 2899 | } |
| 2900 | |
| 2901 | static int selinux_file_ioctl(struct file *file, unsigned int cmd, |
| 2902 | unsigned long arg) |
| 2903 | { |
Stephen Smalley | 242631c | 2008-06-05 09:21:28 -0400 | [diff] [blame] | 2904 | u32 av = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2905 | |
Stephen Smalley | 242631c | 2008-06-05 09:21:28 -0400 | [diff] [blame] | 2906 | if (_IOC_DIR(cmd) & _IOC_WRITE) |
| 2907 | av |= FILE__WRITE; |
| 2908 | if (_IOC_DIR(cmd) & _IOC_READ) |
| 2909 | av |= FILE__READ; |
| 2910 | if (!av) |
| 2911 | av = FILE__IOCTL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2912 | |
Stephen Smalley | 242631c | 2008-06-05 09:21:28 -0400 | [diff] [blame] | 2913 | return file_has_perm(current, file, av); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2914 | } |
| 2915 | |
| 2916 | static int file_map_prot_check(struct file *file, unsigned long prot, int shared) |
| 2917 | { |
| 2918 | #ifndef CONFIG_PPC32 |
| 2919 | if ((prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) { |
| 2920 | /* |
| 2921 | * We are making executable an anonymous mapping or a |
| 2922 | * private file mapping that will also be writable. |
| 2923 | * This has an additional check. |
| 2924 | */ |
| 2925 | int rc = task_has_perm(current, current, PROCESS__EXECMEM); |
| 2926 | if (rc) |
| 2927 | return rc; |
| 2928 | } |
| 2929 | #endif |
| 2930 | |
| 2931 | if (file) { |
| 2932 | /* read access is always possible with a mapping */ |
| 2933 | u32 av = FILE__READ; |
| 2934 | |
| 2935 | /* write access only matters if the mapping is shared */ |
| 2936 | if (shared && (prot & PROT_WRITE)) |
| 2937 | av |= FILE__WRITE; |
| 2938 | |
| 2939 | if (prot & PROT_EXEC) |
| 2940 | av |= FILE__EXECUTE; |
| 2941 | |
| 2942 | return file_has_perm(current, file, av); |
| 2943 | } |
| 2944 | return 0; |
| 2945 | } |
| 2946 | |
| 2947 | static int selinux_file_mmap(struct file *file, unsigned long reqprot, |
Eric Paris | ed03218 | 2007-06-28 15:55:21 -0400 | [diff] [blame] | 2948 | unsigned long prot, unsigned long flags, |
| 2949 | unsigned long addr, unsigned long addr_only) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2950 | { |
Eric Paris | ed03218 | 2007-06-28 15:55:21 -0400 | [diff] [blame] | 2951 | int rc = 0; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2952 | u32 sid = ((struct task_security_struct *)(current->security))->sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2953 | |
Eric Paris | ed03218 | 2007-06-28 15:55:21 -0400 | [diff] [blame] | 2954 | if (addr < mmap_min_addr) |
| 2955 | rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT, |
| 2956 | MEMPROTECT__MMAP_ZERO, NULL); |
| 2957 | if (rc || addr_only) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2958 | return rc; |
| 2959 | |
| 2960 | if (selinux_checkreqprot) |
| 2961 | prot = reqprot; |
| 2962 | |
| 2963 | return file_map_prot_check(file, prot, |
| 2964 | (flags & MAP_TYPE) == MAP_SHARED); |
| 2965 | } |
| 2966 | |
| 2967 | static int selinux_file_mprotect(struct vm_area_struct *vma, |
| 2968 | unsigned long reqprot, |
| 2969 | unsigned long prot) |
| 2970 | { |
| 2971 | int rc; |
| 2972 | |
| 2973 | rc = secondary_ops->file_mprotect(vma, reqprot, prot); |
| 2974 | if (rc) |
| 2975 | return rc; |
| 2976 | |
| 2977 | if (selinux_checkreqprot) |
| 2978 | prot = reqprot; |
| 2979 | |
| 2980 | #ifndef CONFIG_PPC32 |
Stephen Smalley | db4c964 | 2006-02-01 03:05:54 -0800 | [diff] [blame] | 2981 | if ((prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) { |
| 2982 | rc = 0; |
| 2983 | if (vma->vm_start >= vma->vm_mm->start_brk && |
| 2984 | vma->vm_end <= vma->vm_mm->brk) { |
| 2985 | rc = task_has_perm(current, current, |
| 2986 | PROCESS__EXECHEAP); |
| 2987 | } else if (!vma->vm_file && |
| 2988 | vma->vm_start <= vma->vm_mm->start_stack && |
| 2989 | vma->vm_end >= vma->vm_mm->start_stack) { |
| 2990 | rc = task_has_perm(current, current, PROCESS__EXECSTACK); |
| 2991 | } else if (vma->vm_file && vma->anon_vma) { |
| 2992 | /* |
| 2993 | * We are making executable a file mapping that has |
| 2994 | * had some COW done. Since pages might have been |
| 2995 | * written, check ability to execute the possibly |
| 2996 | * modified content. This typically should only |
| 2997 | * occur for text relocations. |
| 2998 | */ |
| 2999 | rc = file_has_perm(current, vma->vm_file, |
| 3000 | FILE__EXECMOD); |
| 3001 | } |
Lorenzo Hernandez GarcÃa-Hierro | 6b99219 | 2005-06-25 14:54:34 -0700 | [diff] [blame] | 3002 | if (rc) |
| 3003 | return rc; |
| 3004 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3005 | #endif |
| 3006 | |
| 3007 | return file_map_prot_check(vma->vm_file, prot, vma->vm_flags&VM_SHARED); |
| 3008 | } |
| 3009 | |
| 3010 | static int selinux_file_lock(struct file *file, unsigned int cmd) |
| 3011 | { |
| 3012 | return file_has_perm(current, file, FILE__LOCK); |
| 3013 | } |
| 3014 | |
| 3015 | static int selinux_file_fcntl(struct file *file, unsigned int cmd, |
| 3016 | unsigned long arg) |
| 3017 | { |
| 3018 | int err = 0; |
| 3019 | |
| 3020 | switch (cmd) { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3021 | case F_SETFL: |
| 3022 | if (!file->f_path.dentry || !file->f_path.dentry->d_inode) { |
| 3023 | err = -EINVAL; |
| 3024 | break; |
| 3025 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3026 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3027 | if ((file->f_flags & O_APPEND) && !(arg & O_APPEND)) { |
| 3028 | err = file_has_perm(current, file, FILE__WRITE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3029 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3030 | } |
| 3031 | /* fall through */ |
| 3032 | case F_SETOWN: |
| 3033 | case F_SETSIG: |
| 3034 | case F_GETFL: |
| 3035 | case F_GETOWN: |
| 3036 | case F_GETSIG: |
| 3037 | /* Just check FD__USE permission */ |
| 3038 | err = file_has_perm(current, file, 0); |
| 3039 | break; |
| 3040 | case F_GETLK: |
| 3041 | case F_SETLK: |
| 3042 | case F_SETLKW: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3043 | #if BITS_PER_LONG == 32 |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3044 | case F_GETLK64: |
| 3045 | case F_SETLK64: |
| 3046 | case F_SETLKW64: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3047 | #endif |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3048 | if (!file->f_path.dentry || !file->f_path.dentry->d_inode) { |
| 3049 | err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3050 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3051 | } |
| 3052 | err = file_has_perm(current, file, FILE__LOCK); |
| 3053 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3054 | } |
| 3055 | |
| 3056 | return err; |
| 3057 | } |
| 3058 | |
| 3059 | static int selinux_file_set_fowner(struct file *file) |
| 3060 | { |
| 3061 | struct task_security_struct *tsec; |
| 3062 | struct file_security_struct *fsec; |
| 3063 | |
| 3064 | tsec = current->security; |
| 3065 | fsec = file->f_security; |
| 3066 | fsec->fown_sid = tsec->sid; |
| 3067 | |
| 3068 | return 0; |
| 3069 | } |
| 3070 | |
| 3071 | static int selinux_file_send_sigiotask(struct task_struct *tsk, |
| 3072 | struct fown_struct *fown, int signum) |
| 3073 | { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3074 | struct file *file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3075 | u32 perm; |
| 3076 | struct task_security_struct *tsec; |
| 3077 | struct file_security_struct *fsec; |
| 3078 | |
| 3079 | /* struct fown_struct is never outside the context of a struct file */ |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3080 | file = container_of(fown, struct file, f_owner); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3081 | |
| 3082 | tsec = tsk->security; |
| 3083 | fsec = file->f_security; |
| 3084 | |
| 3085 | if (!signum) |
| 3086 | perm = signal_to_av(SIGIO); /* as per send_sigio_to_task */ |
| 3087 | else |
| 3088 | perm = signal_to_av(signum); |
| 3089 | |
| 3090 | return avc_has_perm(fsec->fown_sid, tsec->sid, |
| 3091 | SECCLASS_PROCESS, perm, NULL); |
| 3092 | } |
| 3093 | |
| 3094 | static int selinux_file_receive(struct file *file) |
| 3095 | { |
| 3096 | return file_has_perm(current, file, file_to_av(file)); |
| 3097 | } |
| 3098 | |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 3099 | static int selinux_dentry_open(struct file *file) |
| 3100 | { |
| 3101 | struct file_security_struct *fsec; |
| 3102 | struct inode *inode; |
| 3103 | struct inode_security_struct *isec; |
| 3104 | inode = file->f_path.dentry->d_inode; |
| 3105 | fsec = file->f_security; |
| 3106 | isec = inode->i_security; |
| 3107 | /* |
| 3108 | * Save inode label and policy sequence number |
| 3109 | * at open-time so that selinux_file_permission |
| 3110 | * can determine whether revalidation is necessary. |
| 3111 | * Task label is already saved in the file security |
| 3112 | * struct as its SID. |
| 3113 | */ |
| 3114 | fsec->isid = isec->sid; |
| 3115 | fsec->pseqno = avc_policy_seqno(); |
| 3116 | /* |
| 3117 | * Since the inode label or policy seqno may have changed |
| 3118 | * between the selinux_inode_permission check and the saving |
| 3119 | * of state above, recheck that access is still permitted. |
| 3120 | * Otherwise, access might never be revalidated against the |
| 3121 | * new inode label or new policy. |
| 3122 | * This check is not redundant - do not remove. |
| 3123 | */ |
| 3124 | return inode_has_perm(current, inode, file_to_av(file), NULL); |
| 3125 | } |
| 3126 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3127 | /* task security operations */ |
| 3128 | |
| 3129 | static int selinux_task_create(unsigned long clone_flags) |
| 3130 | { |
| 3131 | int rc; |
| 3132 | |
| 3133 | rc = secondary_ops->task_create(clone_flags); |
| 3134 | if (rc) |
| 3135 | return rc; |
| 3136 | |
| 3137 | return task_has_perm(current, current, PROCESS__FORK); |
| 3138 | } |
| 3139 | |
| 3140 | static int selinux_task_alloc_security(struct task_struct *tsk) |
| 3141 | { |
| 3142 | struct task_security_struct *tsec1, *tsec2; |
| 3143 | int rc; |
| 3144 | |
| 3145 | tsec1 = current->security; |
| 3146 | |
| 3147 | rc = task_alloc_security(tsk); |
| 3148 | if (rc) |
| 3149 | return rc; |
| 3150 | tsec2 = tsk->security; |
| 3151 | |
| 3152 | tsec2->osid = tsec1->osid; |
| 3153 | tsec2->sid = tsec1->sid; |
| 3154 | |
Michael LeMay | 28eba5b | 2006-06-27 02:53:42 -0700 | [diff] [blame] | 3155 | /* Retain the exec, fs, key, and sock SIDs across fork */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3156 | tsec2->exec_sid = tsec1->exec_sid; |
| 3157 | tsec2->create_sid = tsec1->create_sid; |
Michael LeMay | 28eba5b | 2006-06-27 02:53:42 -0700 | [diff] [blame] | 3158 | tsec2->keycreate_sid = tsec1->keycreate_sid; |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 3159 | tsec2->sockcreate_sid = tsec1->sockcreate_sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3161 | return 0; |
| 3162 | } |
| 3163 | |
| 3164 | static void selinux_task_free_security(struct task_struct *tsk) |
| 3165 | { |
| 3166 | task_free_security(tsk); |
| 3167 | } |
| 3168 | |
| 3169 | static int selinux_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags) |
| 3170 | { |
| 3171 | /* Since setuid only affects the current process, and |
| 3172 | since the SELinux controls are not based on the Linux |
| 3173 | identity attributes, SELinux does not need to control |
| 3174 | this operation. However, SELinux does control the use |
| 3175 | of the CAP_SETUID and CAP_SETGID capabilities using the |
| 3176 | capable hook. */ |
| 3177 | return 0; |
| 3178 | } |
| 3179 | |
| 3180 | static int selinux_task_post_setuid(uid_t id0, uid_t id1, uid_t id2, int flags) |
| 3181 | { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3182 | return secondary_ops->task_post_setuid(id0, id1, id2, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3183 | } |
| 3184 | |
| 3185 | static int selinux_task_setgid(gid_t id0, gid_t id1, gid_t id2, int flags) |
| 3186 | { |
| 3187 | /* See the comment for setuid above. */ |
| 3188 | return 0; |
| 3189 | } |
| 3190 | |
| 3191 | static int selinux_task_setpgid(struct task_struct *p, pid_t pgid) |
| 3192 | { |
| 3193 | return task_has_perm(current, p, PROCESS__SETPGID); |
| 3194 | } |
| 3195 | |
| 3196 | static int selinux_task_getpgid(struct task_struct *p) |
| 3197 | { |
| 3198 | return task_has_perm(current, p, PROCESS__GETPGID); |
| 3199 | } |
| 3200 | |
| 3201 | static int selinux_task_getsid(struct task_struct *p) |
| 3202 | { |
| 3203 | return task_has_perm(current, p, PROCESS__GETSESSION); |
| 3204 | } |
| 3205 | |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3206 | static void selinux_task_getsecid(struct task_struct *p, u32 *secid) |
| 3207 | { |
Ahmed S. Darwish | 713a04ae | 2008-03-01 21:52:30 +0200 | [diff] [blame] | 3208 | struct task_security_struct *tsec = p->security; |
| 3209 | *secid = tsec->sid; |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3210 | } |
| 3211 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3212 | static int selinux_task_setgroups(struct group_info *group_info) |
| 3213 | { |
| 3214 | /* See the comment for setuid above. */ |
| 3215 | return 0; |
| 3216 | } |
| 3217 | |
| 3218 | static int selinux_task_setnice(struct task_struct *p, int nice) |
| 3219 | { |
| 3220 | int rc; |
| 3221 | |
| 3222 | rc = secondary_ops->task_setnice(p, nice); |
| 3223 | if (rc) |
| 3224 | return rc; |
| 3225 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3226 | return task_has_perm(current, p, PROCESS__SETSCHED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3227 | } |
| 3228 | |
James Morris | 03e6806 | 2006-06-23 02:03:58 -0700 | [diff] [blame] | 3229 | static int selinux_task_setioprio(struct task_struct *p, int ioprio) |
| 3230 | { |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 3231 | int rc; |
| 3232 | |
| 3233 | rc = secondary_ops->task_setioprio(p, ioprio); |
| 3234 | if (rc) |
| 3235 | return rc; |
| 3236 | |
James Morris | 03e6806 | 2006-06-23 02:03:58 -0700 | [diff] [blame] | 3237 | return task_has_perm(current, p, PROCESS__SETSCHED); |
| 3238 | } |
| 3239 | |
David Quigley | a1836a4 | 2006-06-30 01:55:49 -0700 | [diff] [blame] | 3240 | static int selinux_task_getioprio(struct task_struct *p) |
| 3241 | { |
| 3242 | return task_has_perm(current, p, PROCESS__GETSCHED); |
| 3243 | } |
| 3244 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3245 | static int selinux_task_setrlimit(unsigned int resource, struct rlimit *new_rlim) |
| 3246 | { |
| 3247 | struct rlimit *old_rlim = current->signal->rlim + resource; |
| 3248 | int rc; |
| 3249 | |
| 3250 | rc = secondary_ops->task_setrlimit(resource, new_rlim); |
| 3251 | if (rc) |
| 3252 | return rc; |
| 3253 | |
| 3254 | /* Control the ability to change the hard limit (whether |
| 3255 | lowering or raising it), so that the hard limit can |
| 3256 | later be used as a safe reset point for the soft limit |
| 3257 | upon context transitions. See selinux_bprm_apply_creds. */ |
| 3258 | if (old_rlim->rlim_max != new_rlim->rlim_max) |
| 3259 | return task_has_perm(current, current, PROCESS__SETRLIMIT); |
| 3260 | |
| 3261 | return 0; |
| 3262 | } |
| 3263 | |
| 3264 | static int selinux_task_setscheduler(struct task_struct *p, int policy, struct sched_param *lp) |
| 3265 | { |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 3266 | int rc; |
| 3267 | |
| 3268 | rc = secondary_ops->task_setscheduler(p, policy, lp); |
| 3269 | if (rc) |
| 3270 | return rc; |
| 3271 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3272 | return task_has_perm(current, p, PROCESS__SETSCHED); |
| 3273 | } |
| 3274 | |
| 3275 | static int selinux_task_getscheduler(struct task_struct *p) |
| 3276 | { |
| 3277 | return task_has_perm(current, p, PROCESS__GETSCHED); |
| 3278 | } |
| 3279 | |
David Quigley | 3560154 | 2006-06-23 02:04:01 -0700 | [diff] [blame] | 3280 | static int selinux_task_movememory(struct task_struct *p) |
| 3281 | { |
| 3282 | return task_has_perm(current, p, PROCESS__SETSCHED); |
| 3283 | } |
| 3284 | |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3285 | static int selinux_task_kill(struct task_struct *p, struct siginfo *info, |
| 3286 | int sig, u32 secid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3287 | { |
| 3288 | u32 perm; |
| 3289 | int rc; |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3290 | struct task_security_struct *tsec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3291 | |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3292 | rc = secondary_ops->task_kill(p, info, sig, secid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3293 | if (rc) |
| 3294 | return rc; |
| 3295 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3296 | if (!sig) |
| 3297 | perm = PROCESS__SIGNULL; /* null signal; existence test */ |
| 3298 | else |
| 3299 | perm = signal_to_av(sig); |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3300 | tsec = p->security; |
| 3301 | if (secid) |
| 3302 | rc = avc_has_perm(secid, tsec->sid, SECCLASS_PROCESS, perm, NULL); |
| 3303 | else |
| 3304 | rc = task_has_perm(current, p, perm); |
| 3305 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3306 | } |
| 3307 | |
| 3308 | static int selinux_task_prctl(int option, |
| 3309 | unsigned long arg2, |
| 3310 | unsigned long arg3, |
| 3311 | unsigned long arg4, |
Andrew G. Morgan | 3898b1b | 2008-04-28 02:13:40 -0700 | [diff] [blame] | 3312 | unsigned long arg5, |
| 3313 | long *rc_p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3314 | { |
| 3315 | /* The current prctl operations do not appear to require |
| 3316 | any SELinux controls since they merely observe or modify |
| 3317 | the state of the current process. */ |
Andrew G. Morgan | 3898b1b | 2008-04-28 02:13:40 -0700 | [diff] [blame] | 3318 | return secondary_ops->task_prctl(option, arg2, arg3, arg4, arg5, rc_p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3319 | } |
| 3320 | |
| 3321 | static int selinux_task_wait(struct task_struct *p) |
| 3322 | { |
Eric Paris | 8a53514 | 2007-10-22 16:10:31 -0400 | [diff] [blame] | 3323 | return task_has_perm(p, current, PROCESS__SIGCHLD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3324 | } |
| 3325 | |
| 3326 | static void selinux_task_reparent_to_init(struct task_struct *p) |
| 3327 | { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3328 | struct task_security_struct *tsec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3329 | |
| 3330 | secondary_ops->task_reparent_to_init(p); |
| 3331 | |
| 3332 | tsec = p->security; |
| 3333 | tsec->osid = tsec->sid; |
| 3334 | tsec->sid = SECINITSID_KERNEL; |
| 3335 | return; |
| 3336 | } |
| 3337 | |
| 3338 | static void selinux_task_to_inode(struct task_struct *p, |
| 3339 | struct inode *inode) |
| 3340 | { |
| 3341 | struct task_security_struct *tsec = p->security; |
| 3342 | struct inode_security_struct *isec = inode->i_security; |
| 3343 | |
| 3344 | isec->sid = tsec->sid; |
| 3345 | isec->initialized = 1; |
| 3346 | return; |
| 3347 | } |
| 3348 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3349 | /* Returns error only if unable to parse addresses */ |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3350 | static int selinux_parse_skb_ipv4(struct sk_buff *skb, |
| 3351 | struct avc_audit_data *ad, u8 *proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3352 | { |
| 3353 | int offset, ihlen, ret = -EINVAL; |
| 3354 | struct iphdr _iph, *ih; |
| 3355 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 3356 | offset = skb_network_offset(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3357 | ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph); |
| 3358 | if (ih == NULL) |
| 3359 | goto out; |
| 3360 | |
| 3361 | ihlen = ih->ihl * 4; |
| 3362 | if (ihlen < sizeof(_iph)) |
| 3363 | goto out; |
| 3364 | |
| 3365 | ad->u.net.v4info.saddr = ih->saddr; |
| 3366 | ad->u.net.v4info.daddr = ih->daddr; |
| 3367 | ret = 0; |
| 3368 | |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3369 | if (proto) |
| 3370 | *proto = ih->protocol; |
| 3371 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3372 | switch (ih->protocol) { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3373 | case IPPROTO_TCP: { |
| 3374 | struct tcphdr _tcph, *th; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3375 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3376 | if (ntohs(ih->frag_off) & IP_OFFSET) |
| 3377 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3378 | |
| 3379 | offset += ihlen; |
| 3380 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); |
| 3381 | if (th == NULL) |
| 3382 | break; |
| 3383 | |
| 3384 | ad->u.net.sport = th->source; |
| 3385 | ad->u.net.dport = th->dest; |
| 3386 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3387 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3388 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3389 | case IPPROTO_UDP: { |
| 3390 | struct udphdr _udph, *uh; |
| 3391 | |
| 3392 | if (ntohs(ih->frag_off) & IP_OFFSET) |
| 3393 | break; |
| 3394 | |
| 3395 | offset += ihlen; |
| 3396 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); |
| 3397 | if (uh == NULL) |
| 3398 | break; |
| 3399 | |
| 3400 | ad->u.net.sport = uh->source; |
| 3401 | ad->u.net.dport = uh->dest; |
| 3402 | break; |
| 3403 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3404 | |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3405 | case IPPROTO_DCCP: { |
| 3406 | struct dccp_hdr _dccph, *dh; |
| 3407 | |
| 3408 | if (ntohs(ih->frag_off) & IP_OFFSET) |
| 3409 | break; |
| 3410 | |
| 3411 | offset += ihlen; |
| 3412 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); |
| 3413 | if (dh == NULL) |
| 3414 | break; |
| 3415 | |
| 3416 | ad->u.net.sport = dh->dccph_sport; |
| 3417 | ad->u.net.dport = dh->dccph_dport; |
| 3418 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3419 | } |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3420 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3421 | default: |
| 3422 | break; |
| 3423 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3424 | out: |
| 3425 | return ret; |
| 3426 | } |
| 3427 | |
| 3428 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 3429 | |
| 3430 | /* Returns error only if unable to parse addresses */ |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3431 | static int selinux_parse_skb_ipv6(struct sk_buff *skb, |
| 3432 | struct avc_audit_data *ad, u8 *proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3433 | { |
| 3434 | u8 nexthdr; |
| 3435 | int ret = -EINVAL, offset; |
| 3436 | struct ipv6hdr _ipv6h, *ip6; |
| 3437 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 3438 | offset = skb_network_offset(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3439 | ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h); |
| 3440 | if (ip6 == NULL) |
| 3441 | goto out; |
| 3442 | |
| 3443 | ipv6_addr_copy(&ad->u.net.v6info.saddr, &ip6->saddr); |
| 3444 | ipv6_addr_copy(&ad->u.net.v6info.daddr, &ip6->daddr); |
| 3445 | ret = 0; |
| 3446 | |
| 3447 | nexthdr = ip6->nexthdr; |
| 3448 | offset += sizeof(_ipv6h); |
Herbert Xu | 0d3d077 | 2005-04-24 20:16:19 -0700 | [diff] [blame] | 3449 | offset = ipv6_skip_exthdr(skb, offset, &nexthdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3450 | if (offset < 0) |
| 3451 | goto out; |
| 3452 | |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3453 | if (proto) |
| 3454 | *proto = nexthdr; |
| 3455 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3456 | switch (nexthdr) { |
| 3457 | case IPPROTO_TCP: { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3458 | struct tcphdr _tcph, *th; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3459 | |
| 3460 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); |
| 3461 | if (th == NULL) |
| 3462 | break; |
| 3463 | |
| 3464 | ad->u.net.sport = th->source; |
| 3465 | ad->u.net.dport = th->dest; |
| 3466 | break; |
| 3467 | } |
| 3468 | |
| 3469 | case IPPROTO_UDP: { |
| 3470 | struct udphdr _udph, *uh; |
| 3471 | |
| 3472 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); |
| 3473 | if (uh == NULL) |
| 3474 | break; |
| 3475 | |
| 3476 | ad->u.net.sport = uh->source; |
| 3477 | ad->u.net.dport = uh->dest; |
| 3478 | break; |
| 3479 | } |
| 3480 | |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3481 | case IPPROTO_DCCP: { |
| 3482 | struct dccp_hdr _dccph, *dh; |
| 3483 | |
| 3484 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); |
| 3485 | if (dh == NULL) |
| 3486 | break; |
| 3487 | |
| 3488 | ad->u.net.sport = dh->dccph_sport; |
| 3489 | ad->u.net.dport = dh->dccph_dport; |
| 3490 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3491 | } |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3492 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3493 | /* includes fragments */ |
| 3494 | default: |
| 3495 | break; |
| 3496 | } |
| 3497 | out: |
| 3498 | return ret; |
| 3499 | } |
| 3500 | |
| 3501 | #endif /* IPV6 */ |
| 3502 | |
| 3503 | static int selinux_parse_skb(struct sk_buff *skb, struct avc_audit_data *ad, |
Paul Moore | 224dfbd | 2008-01-29 08:38:13 -0500 | [diff] [blame] | 3504 | char **addrp, int src, u8 *proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3505 | { |
| 3506 | int ret = 0; |
| 3507 | |
| 3508 | switch (ad->u.net.family) { |
| 3509 | case PF_INET: |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3510 | ret = selinux_parse_skb_ipv4(skb, ad, proto); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3511 | if (ret || !addrp) |
| 3512 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3513 | *addrp = (char *)(src ? &ad->u.net.v4info.saddr : |
| 3514 | &ad->u.net.v4info.daddr); |
| 3515 | break; |
| 3516 | |
| 3517 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 3518 | case PF_INET6: |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3519 | ret = selinux_parse_skb_ipv6(skb, ad, proto); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3520 | if (ret || !addrp) |
| 3521 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3522 | *addrp = (char *)(src ? &ad->u.net.v6info.saddr : |
| 3523 | &ad->u.net.v6info.daddr); |
| 3524 | break; |
| 3525 | #endif /* IPV6 */ |
| 3526 | default: |
| 3527 | break; |
| 3528 | } |
| 3529 | |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 3530 | if (unlikely(ret)) |
| 3531 | printk(KERN_WARNING |
| 3532 | "SELinux: failure in selinux_parse_skb()," |
| 3533 | " unable to parse packet\n"); |
| 3534 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3535 | return ret; |
| 3536 | } |
| 3537 | |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3538 | /** |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3539 | * selinux_skb_peerlbl_sid - Determine the peer label of a packet |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3540 | * @skb: the packet |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 3541 | * @family: protocol family |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3542 | * @sid: the packet's peer label SID |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3543 | * |
| 3544 | * Description: |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3545 | * Check the various different forms of network peer labeling and determine |
| 3546 | * the peer label/SID for the packet; most of the magic actually occurs in |
| 3547 | * the security server function security_net_peersid_cmp(). The function |
| 3548 | * returns zero if the value in @sid is valid (although it may be SECSID_NULL) |
| 3549 | * or -EACCES if @sid is invalid due to inconsistencies with the different |
| 3550 | * peer labels. |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3551 | * |
| 3552 | */ |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3553 | 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] | 3554 | { |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 3555 | int err; |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3556 | u32 xfrm_sid; |
| 3557 | u32 nlbl_sid; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3558 | u32 nlbl_type; |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3559 | |
| 3560 | selinux_skb_xfrm_sid(skb, &xfrm_sid); |
Paul Moore | 5dbe1eb | 2008-01-29 08:44:18 -0500 | [diff] [blame] | 3561 | selinux_netlbl_skbuff_getsid(skb, family, &nlbl_type, &nlbl_sid); |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3562 | |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 3563 | err = security_net_peersid_resolve(nlbl_sid, nlbl_type, xfrm_sid, sid); |
| 3564 | if (unlikely(err)) { |
| 3565 | printk(KERN_WARNING |
| 3566 | "SELinux: failure in selinux_skb_peerlbl_sid()," |
| 3567 | " unable to determine packet's peer label\n"); |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3568 | return -EACCES; |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 3569 | } |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3570 | |
| 3571 | return 0; |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3572 | } |
| 3573 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3574 | /* socket security operations */ |
| 3575 | static int socket_has_perm(struct task_struct *task, struct socket *sock, |
| 3576 | u32 perms) |
| 3577 | { |
| 3578 | struct inode_security_struct *isec; |
| 3579 | struct task_security_struct *tsec; |
| 3580 | struct avc_audit_data ad; |
| 3581 | int err = 0; |
| 3582 | |
| 3583 | tsec = task->security; |
| 3584 | isec = SOCK_INODE(sock)->i_security; |
| 3585 | |
| 3586 | if (isec->sid == SECINITSID_KERNEL) |
| 3587 | goto out; |
| 3588 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3589 | AVC_AUDIT_DATA_INIT(&ad, NET); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3590 | ad.u.net.sk = sock->sk; |
| 3591 | err = avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, &ad); |
| 3592 | |
| 3593 | out: |
| 3594 | return err; |
| 3595 | } |
| 3596 | |
| 3597 | static int selinux_socket_create(int family, int type, |
| 3598 | int protocol, int kern) |
| 3599 | { |
| 3600 | int err = 0; |
| 3601 | struct task_security_struct *tsec; |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 3602 | u32 newsid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3603 | |
| 3604 | if (kern) |
| 3605 | goto out; |
| 3606 | |
| 3607 | tsec = current->security; |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 3608 | newsid = tsec->sockcreate_sid ? : tsec->sid; |
| 3609 | err = avc_has_perm(tsec->sid, newsid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3610 | socket_type_to_security_class(family, type, |
| 3611 | protocol), SOCKET__CREATE, NULL); |
| 3612 | |
| 3613 | out: |
| 3614 | return err; |
| 3615 | } |
| 3616 | |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 3617 | static int selinux_socket_post_create(struct socket *sock, int family, |
| 3618 | int type, int protocol, int kern) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3619 | { |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 3620 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3621 | struct inode_security_struct *isec; |
| 3622 | struct task_security_struct *tsec; |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 3623 | struct sk_security_struct *sksec; |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 3624 | u32 newsid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3625 | |
| 3626 | isec = SOCK_INODE(sock)->i_security; |
| 3627 | |
| 3628 | tsec = current->security; |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 3629 | newsid = tsec->sockcreate_sid ? : tsec->sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3630 | isec->sclass = socket_type_to_security_class(family, type, protocol); |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 3631 | isec->sid = kern ? SECINITSID_KERNEL : newsid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3632 | isec->initialized = 1; |
| 3633 | |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 3634 | if (sock->sk) { |
| 3635 | sksec = sock->sk->sk_security; |
| 3636 | sksec->sid = isec->sid; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3637 | sksec->sclass = isec->sclass; |
Paul Moore | 9f2ad66 | 2006-11-17 17:38:53 -0500 | [diff] [blame] | 3638 | err = selinux_netlbl_socket_post_create(sock); |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 3639 | } |
| 3640 | |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 3641 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3642 | } |
| 3643 | |
| 3644 | /* Range of port numbers used to automatically bind. |
| 3645 | Need to determine whether we should perform a name_bind |
| 3646 | permission check between the socket and the port number. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3647 | |
| 3648 | static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen) |
| 3649 | { |
| 3650 | u16 family; |
| 3651 | int err; |
| 3652 | |
| 3653 | err = socket_has_perm(current, sock, SOCKET__BIND); |
| 3654 | if (err) |
| 3655 | goto out; |
| 3656 | |
| 3657 | /* |
| 3658 | * 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] | 3659 | * Multiple address binding for SCTP is not supported yet: we just |
| 3660 | * check the first address now. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3661 | */ |
| 3662 | family = sock->sk->sk_family; |
| 3663 | if (family == PF_INET || family == PF_INET6) { |
| 3664 | char *addrp; |
| 3665 | struct inode_security_struct *isec; |
| 3666 | struct task_security_struct *tsec; |
| 3667 | struct avc_audit_data ad; |
| 3668 | struct sockaddr_in *addr4 = NULL; |
| 3669 | struct sockaddr_in6 *addr6 = NULL; |
| 3670 | unsigned short snum; |
| 3671 | struct sock *sk = sock->sk; |
James Morris | e399f98 | 2008-06-12 01:39:58 +1000 | [diff] [blame^] | 3672 | u32 sid, node_perm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3673 | |
| 3674 | tsec = current->security; |
| 3675 | isec = SOCK_INODE(sock)->i_security; |
| 3676 | |
| 3677 | if (family == PF_INET) { |
| 3678 | addr4 = (struct sockaddr_in *)address; |
| 3679 | snum = ntohs(addr4->sin_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3680 | addrp = (char *)&addr4->sin_addr.s_addr; |
| 3681 | } else { |
| 3682 | addr6 = (struct sockaddr_in6 *)address; |
| 3683 | snum = ntohs(addr6->sin6_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3684 | addrp = (char *)&addr6->sin6_addr.s6_addr; |
| 3685 | } |
| 3686 | |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 3687 | if (snum) { |
| 3688 | int low, high; |
| 3689 | |
| 3690 | inet_get_local_port_range(&low, &high); |
| 3691 | |
| 3692 | if (snum < max(PROT_SOCK, low) || snum > high) { |
Paul Moore | 3e11217 | 2008-04-10 10:48:14 -0400 | [diff] [blame] | 3693 | err = sel_netport_sid(sk->sk_protocol, |
| 3694 | snum, &sid); |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 3695 | if (err) |
| 3696 | goto out; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3697 | AVC_AUDIT_DATA_INIT(&ad, NET); |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 3698 | ad.u.net.sport = htons(snum); |
| 3699 | ad.u.net.family = family; |
| 3700 | err = avc_has_perm(isec->sid, sid, |
| 3701 | isec->sclass, |
| 3702 | SOCKET__NAME_BIND, &ad); |
| 3703 | if (err) |
| 3704 | goto out; |
| 3705 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3706 | } |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3707 | |
| 3708 | switch (isec->sclass) { |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 3709 | case SECCLASS_TCP_SOCKET: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3710 | node_perm = TCP_SOCKET__NODE_BIND; |
| 3711 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3712 | |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 3713 | case SECCLASS_UDP_SOCKET: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3714 | node_perm = UDP_SOCKET__NODE_BIND; |
| 3715 | break; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3716 | |
| 3717 | case SECCLASS_DCCP_SOCKET: |
| 3718 | node_perm = DCCP_SOCKET__NODE_BIND; |
| 3719 | break; |
| 3720 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3721 | default: |
| 3722 | node_perm = RAWIP_SOCKET__NODE_BIND; |
| 3723 | break; |
| 3724 | } |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3725 | |
Paul Moore | 224dfbd | 2008-01-29 08:38:13 -0500 | [diff] [blame] | 3726 | err = sel_netnode_sid(addrp, family, &sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3727 | if (err) |
| 3728 | goto out; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3729 | |
| 3730 | AVC_AUDIT_DATA_INIT(&ad, NET); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3731 | ad.u.net.sport = htons(snum); |
| 3732 | ad.u.net.family = family; |
| 3733 | |
| 3734 | if (family == PF_INET) |
| 3735 | ad.u.net.v4info.saddr = addr4->sin_addr.s_addr; |
| 3736 | else |
| 3737 | ipv6_addr_copy(&ad.u.net.v6info.saddr, &addr6->sin6_addr); |
| 3738 | |
| 3739 | err = avc_has_perm(isec->sid, sid, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3740 | isec->sclass, node_perm, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3741 | if (err) |
| 3742 | goto out; |
| 3743 | } |
| 3744 | out: |
| 3745 | return err; |
| 3746 | } |
| 3747 | |
| 3748 | static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen) |
| 3749 | { |
| 3750 | struct inode_security_struct *isec; |
| 3751 | int err; |
| 3752 | |
| 3753 | err = socket_has_perm(current, sock, SOCKET__CONNECT); |
| 3754 | if (err) |
| 3755 | return err; |
| 3756 | |
| 3757 | /* |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3758 | * 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] | 3759 | */ |
| 3760 | isec = SOCK_INODE(sock)->i_security; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3761 | if (isec->sclass == SECCLASS_TCP_SOCKET || |
| 3762 | isec->sclass == SECCLASS_DCCP_SOCKET) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3763 | struct sock *sk = sock->sk; |
| 3764 | struct avc_audit_data ad; |
| 3765 | struct sockaddr_in *addr4 = NULL; |
| 3766 | struct sockaddr_in6 *addr6 = NULL; |
| 3767 | unsigned short snum; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3768 | u32 sid, perm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3769 | |
| 3770 | if (sk->sk_family == PF_INET) { |
| 3771 | addr4 = (struct sockaddr_in *)address; |
Stephen Smalley | 911656f | 2005-07-28 21:16:21 -0700 | [diff] [blame] | 3772 | if (addrlen < sizeof(struct sockaddr_in)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3773 | return -EINVAL; |
| 3774 | snum = ntohs(addr4->sin_port); |
| 3775 | } else { |
| 3776 | addr6 = (struct sockaddr_in6 *)address; |
Stephen Smalley | 911656f | 2005-07-28 21:16:21 -0700 | [diff] [blame] | 3777 | if (addrlen < SIN6_LEN_RFC2133) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3778 | return -EINVAL; |
| 3779 | snum = ntohs(addr6->sin6_port); |
| 3780 | } |
| 3781 | |
Paul Moore | 3e11217 | 2008-04-10 10:48:14 -0400 | [diff] [blame] | 3782 | err = sel_netport_sid(sk->sk_protocol, snum, &sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3783 | if (err) |
| 3784 | goto out; |
| 3785 | |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3786 | perm = (isec->sclass == SECCLASS_TCP_SOCKET) ? |
| 3787 | TCP_SOCKET__NAME_CONNECT : DCCP_SOCKET__NAME_CONNECT; |
| 3788 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3789 | AVC_AUDIT_DATA_INIT(&ad, NET); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3790 | ad.u.net.dport = htons(snum); |
| 3791 | ad.u.net.family = sk->sk_family; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3792 | err = avc_has_perm(isec->sid, sid, isec->sclass, perm, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3793 | if (err) |
| 3794 | goto out; |
| 3795 | } |
| 3796 | |
| 3797 | out: |
| 3798 | return err; |
| 3799 | } |
| 3800 | |
| 3801 | static int selinux_socket_listen(struct socket *sock, int backlog) |
| 3802 | { |
| 3803 | return socket_has_perm(current, sock, SOCKET__LISTEN); |
| 3804 | } |
| 3805 | |
| 3806 | static int selinux_socket_accept(struct socket *sock, struct socket *newsock) |
| 3807 | { |
| 3808 | int err; |
| 3809 | struct inode_security_struct *isec; |
| 3810 | struct inode_security_struct *newisec; |
| 3811 | |
| 3812 | err = socket_has_perm(current, sock, SOCKET__ACCEPT); |
| 3813 | if (err) |
| 3814 | return err; |
| 3815 | |
| 3816 | newisec = SOCK_INODE(newsock)->i_security; |
| 3817 | |
| 3818 | isec = SOCK_INODE(sock)->i_security; |
| 3819 | newisec->sclass = isec->sclass; |
| 3820 | newisec->sid = isec->sid; |
| 3821 | newisec->initialized = 1; |
| 3822 | |
| 3823 | return 0; |
| 3824 | } |
| 3825 | |
| 3826 | static int selinux_socket_sendmsg(struct socket *sock, struct msghdr *msg, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3827 | int size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3828 | { |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 3829 | int rc; |
| 3830 | |
| 3831 | rc = socket_has_perm(current, sock, SOCKET__WRITE); |
| 3832 | if (rc) |
| 3833 | return rc; |
| 3834 | |
| 3835 | return selinux_netlbl_inode_permission(SOCK_INODE(sock), MAY_WRITE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3836 | } |
| 3837 | |
| 3838 | static int selinux_socket_recvmsg(struct socket *sock, struct msghdr *msg, |
| 3839 | int size, int flags) |
| 3840 | { |
| 3841 | return socket_has_perm(current, sock, SOCKET__READ); |
| 3842 | } |
| 3843 | |
| 3844 | static int selinux_socket_getsockname(struct socket *sock) |
| 3845 | { |
| 3846 | return socket_has_perm(current, sock, SOCKET__GETATTR); |
| 3847 | } |
| 3848 | |
| 3849 | static int selinux_socket_getpeername(struct socket *sock) |
| 3850 | { |
| 3851 | return socket_has_perm(current, sock, SOCKET__GETATTR); |
| 3852 | } |
| 3853 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3854 | static int selinux_socket_setsockopt(struct socket *sock, int level, int optname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3855 | { |
Paul Moore | f8687af | 2006-10-30 15:22:15 -0800 | [diff] [blame] | 3856 | int err; |
| 3857 | |
| 3858 | err = socket_has_perm(current, sock, SOCKET__SETOPT); |
| 3859 | if (err) |
| 3860 | return err; |
| 3861 | |
| 3862 | return selinux_netlbl_socket_setsockopt(sock, level, optname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3863 | } |
| 3864 | |
| 3865 | static int selinux_socket_getsockopt(struct socket *sock, int level, |
| 3866 | int optname) |
| 3867 | { |
| 3868 | return socket_has_perm(current, sock, SOCKET__GETOPT); |
| 3869 | } |
| 3870 | |
| 3871 | static int selinux_socket_shutdown(struct socket *sock, int how) |
| 3872 | { |
| 3873 | return socket_has_perm(current, sock, SOCKET__SHUTDOWN); |
| 3874 | } |
| 3875 | |
| 3876 | static int selinux_socket_unix_stream_connect(struct socket *sock, |
| 3877 | struct socket *other, |
| 3878 | struct sock *newsk) |
| 3879 | { |
| 3880 | struct sk_security_struct *ssec; |
| 3881 | struct inode_security_struct *isec; |
| 3882 | struct inode_security_struct *other_isec; |
| 3883 | struct avc_audit_data ad; |
| 3884 | int err; |
| 3885 | |
| 3886 | err = secondary_ops->unix_stream_connect(sock, other, newsk); |
| 3887 | if (err) |
| 3888 | return err; |
| 3889 | |
| 3890 | isec = SOCK_INODE(sock)->i_security; |
| 3891 | other_isec = SOCK_INODE(other)->i_security; |
| 3892 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3893 | AVC_AUDIT_DATA_INIT(&ad, NET); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3894 | ad.u.net.sk = other->sk; |
| 3895 | |
| 3896 | err = avc_has_perm(isec->sid, other_isec->sid, |
| 3897 | isec->sclass, |
| 3898 | UNIX_STREAM_SOCKET__CONNECTTO, &ad); |
| 3899 | if (err) |
| 3900 | return err; |
| 3901 | |
| 3902 | /* connecting socket */ |
| 3903 | ssec = sock->sk->sk_security; |
| 3904 | ssec->peer_sid = other_isec->sid; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3905 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3906 | /* server child socket */ |
| 3907 | ssec = newsk->sk_security; |
| 3908 | ssec->peer_sid = isec->sid; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 3909 | err = security_sid_mls_copy(other_isec->sid, ssec->peer_sid, &ssec->sid); |
| 3910 | |
| 3911 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3912 | } |
| 3913 | |
| 3914 | static int selinux_socket_unix_may_send(struct socket *sock, |
| 3915 | struct socket *other) |
| 3916 | { |
| 3917 | struct inode_security_struct *isec; |
| 3918 | struct inode_security_struct *other_isec; |
| 3919 | struct avc_audit_data ad; |
| 3920 | int err; |
| 3921 | |
| 3922 | isec = SOCK_INODE(sock)->i_security; |
| 3923 | other_isec = SOCK_INODE(other)->i_security; |
| 3924 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3925 | AVC_AUDIT_DATA_INIT(&ad, NET); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3926 | ad.u.net.sk = other->sk; |
| 3927 | |
| 3928 | err = avc_has_perm(isec->sid, other_isec->sid, |
| 3929 | isec->sclass, SOCKET__SENDTO, &ad); |
| 3930 | if (err) |
| 3931 | return err; |
| 3932 | |
| 3933 | return 0; |
| 3934 | } |
| 3935 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 3936 | static int selinux_inet_sys_rcv_skb(int ifindex, char *addrp, u16 family, |
| 3937 | u32 peer_sid, |
| 3938 | struct avc_audit_data *ad) |
| 3939 | { |
| 3940 | int err; |
| 3941 | u32 if_sid; |
| 3942 | u32 node_sid; |
| 3943 | |
| 3944 | err = sel_netif_sid(ifindex, &if_sid); |
| 3945 | if (err) |
| 3946 | return err; |
| 3947 | err = avc_has_perm(peer_sid, if_sid, |
| 3948 | SECCLASS_NETIF, NETIF__INGRESS, ad); |
| 3949 | if (err) |
| 3950 | return err; |
| 3951 | |
| 3952 | err = sel_netnode_sid(addrp, family, &node_sid); |
| 3953 | if (err) |
| 3954 | return err; |
| 3955 | return avc_has_perm(peer_sid, node_sid, |
| 3956 | SECCLASS_NODE, NODE__RECVFROM, ad); |
| 3957 | } |
| 3958 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3959 | static int selinux_sock_rcv_skb_iptables_compat(struct sock *sk, |
| 3960 | struct sk_buff *skb, |
| 3961 | struct avc_audit_data *ad, |
| 3962 | u16 family, |
| 3963 | char *addrp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3964 | { |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3965 | int err; |
| 3966 | struct sk_security_struct *sksec = sk->sk_security; |
| 3967 | u16 sk_class; |
| 3968 | u32 netif_perm, node_perm, recv_perm; |
| 3969 | u32 port_sid, node_sid, if_sid, sk_sid; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 3970 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3971 | sk_sid = sksec->sid; |
| 3972 | sk_class = sksec->sclass; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3973 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3974 | switch (sk_class) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3975 | case SECCLASS_UDP_SOCKET: |
| 3976 | netif_perm = NETIF__UDP_RECV; |
| 3977 | node_perm = NODE__UDP_RECV; |
| 3978 | recv_perm = UDP_SOCKET__RECV_MSG; |
| 3979 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3980 | case SECCLASS_TCP_SOCKET: |
| 3981 | netif_perm = NETIF__TCP_RECV; |
| 3982 | node_perm = NODE__TCP_RECV; |
| 3983 | recv_perm = TCP_SOCKET__RECV_MSG; |
| 3984 | break; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3985 | case SECCLASS_DCCP_SOCKET: |
| 3986 | netif_perm = NETIF__DCCP_RECV; |
| 3987 | node_perm = NODE__DCCP_RECV; |
| 3988 | recv_perm = DCCP_SOCKET__RECV_MSG; |
| 3989 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3990 | default: |
| 3991 | netif_perm = NETIF__RAWIP_RECV; |
| 3992 | node_perm = NODE__RAWIP_RECV; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3993 | recv_perm = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3994 | break; |
| 3995 | } |
| 3996 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3997 | err = sel_netif_sid(skb->iif, &if_sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3998 | if (err) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3999 | return err; |
| 4000 | err = avc_has_perm(sk_sid, if_sid, SECCLASS_NETIF, netif_perm, ad); |
| 4001 | if (err) |
| 4002 | return err; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4003 | |
Paul Moore | 224dfbd | 2008-01-29 08:38:13 -0500 | [diff] [blame] | 4004 | err = sel_netnode_sid(addrp, family, &node_sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4005 | if (err) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4006 | return err; |
| 4007 | 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] | 4008 | if (err) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4009 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4010 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4011 | if (!recv_perm) |
| 4012 | return 0; |
Paul Moore | 3e11217 | 2008-04-10 10:48:14 -0400 | [diff] [blame] | 4013 | err = sel_netport_sid(sk->sk_protocol, |
| 4014 | ntohs(ad->u.net.sport), &port_sid); |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 4015 | if (unlikely(err)) { |
| 4016 | printk(KERN_WARNING |
| 4017 | "SELinux: failure in" |
| 4018 | " selinux_sock_rcv_skb_iptables_compat()," |
| 4019 | " network port label not found\n"); |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4020 | return err; |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 4021 | } |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4022 | return avc_has_perm(sk_sid, port_sid, sk_class, recv_perm, ad); |
| 4023 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4024 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4025 | static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb, |
| 4026 | struct avc_audit_data *ad, |
| 4027 | u16 family, char *addrp) |
| 4028 | { |
| 4029 | int err; |
| 4030 | struct sk_security_struct *sksec = sk->sk_security; |
| 4031 | u32 peer_sid; |
| 4032 | u32 sk_sid = sksec->sid; |
| 4033 | |
| 4034 | if (selinux_compat_net) |
| 4035 | err = selinux_sock_rcv_skb_iptables_compat(sk, skb, ad, |
| 4036 | family, addrp); |
| 4037 | else |
| 4038 | err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET, |
| 4039 | PACKET__RECV, ad); |
| 4040 | if (err) |
| 4041 | return err; |
| 4042 | |
| 4043 | if (selinux_policycap_netpeer) { |
| 4044 | err = selinux_skb_peerlbl_sid(skb, family, &peer_sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4045 | if (err) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4046 | return err; |
| 4047 | err = avc_has_perm(sk_sid, peer_sid, |
| 4048 | SECCLASS_PEER, PEER__RECV, ad); |
| 4049 | } else { |
| 4050 | err = selinux_netlbl_sock_rcv_skb(sksec, skb, family, ad); |
| 4051 | if (err) |
| 4052 | return err; |
| 4053 | err = selinux_xfrm_sock_rcv_skb(sksec->sid, skb, ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4054 | } |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4055 | |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4056 | return err; |
| 4057 | } |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4058 | |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4059 | static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) |
| 4060 | { |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4061 | int err; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4062 | struct sk_security_struct *sksec = sk->sk_security; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4063 | u16 family = sk->sk_family; |
| 4064 | u32 sk_sid = sksec->sid; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4065 | struct avc_audit_data ad; |
| 4066 | char *addrp; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4067 | |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4068 | if (family != PF_INET && family != PF_INET6) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4069 | return 0; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4070 | |
| 4071 | /* Handle mapped IPv4 packets arriving via IPv6 sockets */ |
Al Viro | 87fcd70 | 2006-12-04 22:00:55 +0000 | [diff] [blame] | 4072 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4073 | family = PF_INET; |
| 4074 | |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4075 | AVC_AUDIT_DATA_INIT(&ad, NET); |
Paul Moore | da5645a | 2008-01-29 08:38:10 -0500 | [diff] [blame] | 4076 | ad.u.net.netif = skb->iif; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4077 | ad.u.net.family = family; |
Paul Moore | 224dfbd | 2008-01-29 08:38:13 -0500 | [diff] [blame] | 4078 | err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL); |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4079 | if (err) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4080 | return err; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4081 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4082 | /* If any sort of compatibility mode is enabled then handoff processing |
| 4083 | * to the selinux_sock_rcv_skb_compat() function to deal with the |
| 4084 | * special handling. We do this in an attempt to keep this function |
| 4085 | * as fast and as clean as possible. */ |
| 4086 | if (selinux_compat_net || !selinux_policycap_netpeer) |
| 4087 | return selinux_sock_rcv_skb_compat(sk, skb, &ad, |
| 4088 | family, addrp); |
| 4089 | |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 4090 | if (netlbl_enabled() || selinux_xfrm_enabled()) { |
| 4091 | u32 peer_sid; |
| 4092 | |
| 4093 | err = selinux_skb_peerlbl_sid(skb, family, &peer_sid); |
| 4094 | if (err) |
| 4095 | return err; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4096 | err = selinux_inet_sys_rcv_skb(skb->iif, addrp, family, |
| 4097 | peer_sid, &ad); |
| 4098 | if (err) |
| 4099 | return err; |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 4100 | err = avc_has_perm(sk_sid, peer_sid, SECCLASS_PEER, |
| 4101 | PEER__RECV, &ad); |
| 4102 | } |
| 4103 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4104 | if (selinux_secmark_enabled()) { |
| 4105 | err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET, |
| 4106 | PACKET__RECV, &ad); |
| 4107 | if (err) |
| 4108 | return err; |
| 4109 | } |
| 4110 | |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 4111 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4112 | } |
| 4113 | |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4114 | static int selinux_socket_getpeersec_stream(struct socket *sock, char __user *optval, |
| 4115 | int __user *optlen, unsigned len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4116 | { |
| 4117 | int err = 0; |
| 4118 | char *scontext; |
| 4119 | u32 scontext_len; |
| 4120 | struct sk_security_struct *ssec; |
| 4121 | struct inode_security_struct *isec; |
Paul Moore | 3de4bab | 2006-11-17 17:38:54 -0500 | [diff] [blame] | 4122 | u32 peer_sid = SECSID_NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4123 | |
| 4124 | isec = SOCK_INODE(sock)->i_security; |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4125 | |
Paul Moore | 3de4bab | 2006-11-17 17:38:54 -0500 | [diff] [blame] | 4126 | if (isec->sclass == SECCLASS_UNIX_STREAM_SOCKET || |
| 4127 | isec->sclass == SECCLASS_TCP_SOCKET) { |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4128 | ssec = sock->sk->sk_security; |
| 4129 | peer_sid = ssec->peer_sid; |
| 4130 | } |
Paul Moore | 3de4bab | 2006-11-17 17:38:54 -0500 | [diff] [blame] | 4131 | if (peer_sid == SECSID_NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4132 | err = -ENOPROTOOPT; |
| 4133 | goto out; |
| 4134 | } |
| 4135 | |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4136 | err = security_sid_to_context(peer_sid, &scontext, &scontext_len); |
| 4137 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4138 | if (err) |
| 4139 | goto out; |
| 4140 | |
| 4141 | if (scontext_len > len) { |
| 4142 | err = -ERANGE; |
| 4143 | goto out_len; |
| 4144 | } |
| 4145 | |
| 4146 | if (copy_to_user(optval, scontext, scontext_len)) |
| 4147 | err = -EFAULT; |
| 4148 | |
| 4149 | out_len: |
| 4150 | if (put_user(scontext_len, optlen)) |
| 4151 | err = -EFAULT; |
| 4152 | |
| 4153 | kfree(scontext); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4154 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4155 | return err; |
| 4156 | } |
| 4157 | |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 4158 | 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] | 4159 | { |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 4160 | u32 peer_secid = SECSID_NULL; |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4161 | u16 family; |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 4162 | |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4163 | if (sock) |
| 4164 | family = sock->sk->sk_family; |
| 4165 | else if (skb && skb->sk) |
| 4166 | family = skb->sk->sk_family; |
| 4167 | else |
| 4168 | goto out; |
| 4169 | |
| 4170 | if (sock && family == PF_UNIX) |
Ahmed S. Darwish | 713a04ae | 2008-03-01 21:52:30 +0200 | [diff] [blame] | 4171 | selinux_inode_getsecid(SOCK_INODE(sock), &peer_secid); |
Paul Moore | 3de4bab | 2006-11-17 17:38:54 -0500 | [diff] [blame] | 4172 | else if (skb) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4173 | selinux_skb_peerlbl_sid(skb, family, &peer_secid); |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4174 | |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4175 | out: |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 4176 | *secid = peer_secid; |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4177 | if (peer_secid == SECSID_NULL) |
| 4178 | return -EINVAL; |
| 4179 | return 0; |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4180 | } |
| 4181 | |
Al Viro | 7d877f3 | 2005-10-21 03:20:43 -0400 | [diff] [blame] | 4182 | 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] | 4183 | { |
| 4184 | return sk_alloc_security(sk, family, priority); |
| 4185 | } |
| 4186 | |
| 4187 | static void selinux_sk_free_security(struct sock *sk) |
| 4188 | { |
| 4189 | sk_free_security(sk); |
| 4190 | } |
| 4191 | |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4192 | static void selinux_sk_clone_security(const struct sock *sk, struct sock *newsk) |
| 4193 | { |
| 4194 | struct sk_security_struct *ssec = sk->sk_security; |
| 4195 | struct sk_security_struct *newssec = newsk->sk_security; |
| 4196 | |
| 4197 | newssec->sid = ssec->sid; |
| 4198 | newssec->peer_sid = ssec->peer_sid; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4199 | newssec->sclass = ssec->sclass; |
Paul Moore | 99f59ed | 2006-08-29 17:53:48 -0700 | [diff] [blame] | 4200 | |
Paul Moore | f74af6e | 2008-02-25 11:40:33 -0500 | [diff] [blame] | 4201 | selinux_netlbl_sk_security_reset(newssec, newsk->sk_family); |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4202 | } |
| 4203 | |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 4204 | static void selinux_sk_getsecid(struct sock *sk, u32 *secid) |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4205 | { |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4206 | if (!sk) |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 4207 | *secid = SECINITSID_ANY_SOCKET; |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4208 | else { |
| 4209 | struct sk_security_struct *sksec = sk->sk_security; |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4210 | |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 4211 | *secid = sksec->sid; |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4212 | } |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4213 | } |
| 4214 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4215 | static void selinux_sock_graft(struct sock *sk, struct socket *parent) |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4216 | { |
| 4217 | struct inode_security_struct *isec = SOCK_INODE(parent)->i_security; |
| 4218 | struct sk_security_struct *sksec = sk->sk_security; |
| 4219 | |
David Woodhouse | 2148ccc | 2006-09-29 15:50:25 -0700 | [diff] [blame] | 4220 | if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6 || |
| 4221 | sk->sk_family == PF_UNIX) |
| 4222 | isec->sid = sksec->sid; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4223 | sksec->sclass = isec->sclass; |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 4224 | |
| 4225 | selinux_netlbl_sock_graft(sk, parent); |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4226 | } |
| 4227 | |
Adrian Bunk | 9a673e5 | 2006-08-15 00:03:53 -0700 | [diff] [blame] | 4228 | static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb, |
| 4229 | struct request_sock *req) |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4230 | { |
| 4231 | struct sk_security_struct *sksec = sk->sk_security; |
| 4232 | int err; |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 4233 | u32 newsid; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4234 | u32 peersid; |
| 4235 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4236 | err = selinux_skb_peerlbl_sid(skb, sk->sk_family, &peersid); |
| 4237 | if (err) |
| 4238 | return err; |
Venkat Yekkirala | a51c64f | 2006-07-27 22:01:34 -0700 | [diff] [blame] | 4239 | if (peersid == SECSID_NULL) { |
| 4240 | req->secid = sksec->sid; |
Paul Moore | 3de4bab | 2006-11-17 17:38:54 -0500 | [diff] [blame] | 4241 | req->peer_secid = SECSID_NULL; |
Venkat Yekkirala | a51c64f | 2006-07-27 22:01:34 -0700 | [diff] [blame] | 4242 | return 0; |
| 4243 | } |
| 4244 | |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4245 | err = security_sid_mls_copy(sksec->sid, peersid, &newsid); |
| 4246 | if (err) |
| 4247 | return err; |
| 4248 | |
| 4249 | req->secid = newsid; |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 4250 | req->peer_secid = peersid; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4251 | return 0; |
| 4252 | } |
| 4253 | |
Adrian Bunk | 9a673e5 | 2006-08-15 00:03:53 -0700 | [diff] [blame] | 4254 | static void selinux_inet_csk_clone(struct sock *newsk, |
| 4255 | const struct request_sock *req) |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4256 | { |
| 4257 | struct sk_security_struct *newsksec = newsk->sk_security; |
| 4258 | |
| 4259 | newsksec->sid = req->secid; |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 4260 | newsksec->peer_sid = req->peer_secid; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4261 | /* NOTE: Ideally, we should also get the isec->sid for the |
| 4262 | new socket in sync, but we don't have the isec available yet. |
| 4263 | So we will wait until sock_graft to do it, by which |
| 4264 | time it will have been created and available. */ |
Paul Moore | 99f59ed | 2006-08-29 17:53:48 -0700 | [diff] [blame] | 4265 | |
Paul Moore | 9f2ad66 | 2006-11-17 17:38:53 -0500 | [diff] [blame] | 4266 | /* We don't need to take any sort of lock here as we are the only |
| 4267 | * thread with access to newsksec */ |
| 4268 | selinux_netlbl_sk_security_reset(newsksec, req->rsk_ops->family); |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4269 | } |
| 4270 | |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 4271 | static void selinux_inet_conn_established(struct sock *sk, |
| 4272 | struct sk_buff *skb) |
| 4273 | { |
| 4274 | struct sk_security_struct *sksec = sk->sk_security; |
| 4275 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4276 | selinux_skb_peerlbl_sid(skb, sk->sk_family, &sksec->peer_sid); |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 4277 | } |
| 4278 | |
Adrian Bunk | 9a673e5 | 2006-08-15 00:03:53 -0700 | [diff] [blame] | 4279 | static void selinux_req_classify_flow(const struct request_sock *req, |
| 4280 | struct flowi *fl) |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4281 | { |
| 4282 | fl->secid = req->secid; |
| 4283 | } |
| 4284 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4285 | static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb) |
| 4286 | { |
| 4287 | int err = 0; |
| 4288 | u32 perm; |
| 4289 | struct nlmsghdr *nlh; |
| 4290 | struct socket *sock = sk->sk_socket; |
| 4291 | struct inode_security_struct *isec = SOCK_INODE(sock)->i_security; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4292 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4293 | if (skb->len < NLMSG_SPACE(0)) { |
| 4294 | err = -EINVAL; |
| 4295 | goto out; |
| 4296 | } |
Arnaldo Carvalho de Melo | b529ccf | 2007-04-25 19:08:35 -0700 | [diff] [blame] | 4297 | nlh = nlmsg_hdr(skb); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4298 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4299 | err = selinux_nlmsg_lookup(isec->sclass, nlh->nlmsg_type, &perm); |
| 4300 | if (err) { |
| 4301 | if (err == -EINVAL) { |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 4302 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_SELINUX_ERR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4303 | "SELinux: unrecognized netlink message" |
| 4304 | " type=%hu for sclass=%hu\n", |
| 4305 | nlh->nlmsg_type, isec->sclass); |
| 4306 | if (!selinux_enforcing) |
| 4307 | err = 0; |
| 4308 | } |
| 4309 | |
| 4310 | /* Ignore */ |
| 4311 | if (err == -ENOENT) |
| 4312 | err = 0; |
| 4313 | goto out; |
| 4314 | } |
| 4315 | |
| 4316 | err = socket_has_perm(current, sock, perm); |
| 4317 | out: |
| 4318 | return err; |
| 4319 | } |
| 4320 | |
| 4321 | #ifdef CONFIG_NETFILTER |
| 4322 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4323 | static unsigned int selinux_ip_forward(struct sk_buff *skb, int ifindex, |
| 4324 | u16 family) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4325 | { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4326 | char *addrp; |
| 4327 | u32 peer_sid; |
| 4328 | struct avc_audit_data ad; |
| 4329 | u8 secmark_active; |
| 4330 | u8 peerlbl_active; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4331 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4332 | if (!selinux_policycap_netpeer) |
| 4333 | return NF_ACCEPT; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4334 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4335 | secmark_active = selinux_secmark_enabled(); |
| 4336 | peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled(); |
| 4337 | if (!secmark_active && !peerlbl_active) |
| 4338 | return NF_ACCEPT; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4339 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4340 | AVC_AUDIT_DATA_INIT(&ad, NET); |
| 4341 | ad.u.net.netif = ifindex; |
| 4342 | ad.u.net.family = family; |
| 4343 | if (selinux_parse_skb(skb, &ad, &addrp, 1, NULL) != 0) |
| 4344 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4345 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4346 | if (selinux_skb_peerlbl_sid(skb, family, &peer_sid) != 0) |
| 4347 | return NF_DROP; |
| 4348 | |
| 4349 | if (peerlbl_active) |
| 4350 | if (selinux_inet_sys_rcv_skb(ifindex, addrp, family, |
| 4351 | peer_sid, &ad) != 0) |
| 4352 | return NF_DROP; |
| 4353 | |
| 4354 | if (secmark_active) |
| 4355 | if (avc_has_perm(peer_sid, skb->secmark, |
| 4356 | SECCLASS_PACKET, PACKET__FORWARD_IN, &ad)) |
| 4357 | return NF_DROP; |
| 4358 | |
| 4359 | return NF_ACCEPT; |
| 4360 | } |
| 4361 | |
| 4362 | static unsigned int selinux_ipv4_forward(unsigned int hooknum, |
| 4363 | struct sk_buff *skb, |
| 4364 | const struct net_device *in, |
| 4365 | const struct net_device *out, |
| 4366 | int (*okfn)(struct sk_buff *)) |
| 4367 | { |
| 4368 | return selinux_ip_forward(skb, in->ifindex, PF_INET); |
| 4369 | } |
| 4370 | |
| 4371 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 4372 | static unsigned int selinux_ipv6_forward(unsigned int hooknum, |
| 4373 | struct sk_buff *skb, |
| 4374 | const struct net_device *in, |
| 4375 | const struct net_device *out, |
| 4376 | int (*okfn)(struct sk_buff *)) |
| 4377 | { |
| 4378 | return selinux_ip_forward(skb, in->ifindex, PF_INET6); |
| 4379 | } |
| 4380 | #endif /* IPV6 */ |
| 4381 | |
| 4382 | static int selinux_ip_postroute_iptables_compat(struct sock *sk, |
| 4383 | int ifindex, |
| 4384 | struct avc_audit_data *ad, |
| 4385 | u16 family, char *addrp) |
| 4386 | { |
| 4387 | int err; |
| 4388 | struct sk_security_struct *sksec = sk->sk_security; |
| 4389 | u16 sk_class; |
| 4390 | u32 netif_perm, node_perm, send_perm; |
| 4391 | u32 port_sid, node_sid, if_sid, sk_sid; |
| 4392 | |
| 4393 | sk_sid = sksec->sid; |
| 4394 | sk_class = sksec->sclass; |
| 4395 | |
| 4396 | switch (sk_class) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4397 | case SECCLASS_UDP_SOCKET: |
| 4398 | netif_perm = NETIF__UDP_SEND; |
| 4399 | node_perm = NODE__UDP_SEND; |
| 4400 | send_perm = UDP_SOCKET__SEND_MSG; |
| 4401 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4402 | case SECCLASS_TCP_SOCKET: |
| 4403 | netif_perm = NETIF__TCP_SEND; |
| 4404 | node_perm = NODE__TCP_SEND; |
| 4405 | send_perm = TCP_SOCKET__SEND_MSG; |
| 4406 | break; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 4407 | case SECCLASS_DCCP_SOCKET: |
| 4408 | netif_perm = NETIF__DCCP_SEND; |
| 4409 | node_perm = NODE__DCCP_SEND; |
| 4410 | send_perm = DCCP_SOCKET__SEND_MSG; |
| 4411 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4412 | default: |
| 4413 | netif_perm = NETIF__RAWIP_SEND; |
| 4414 | node_perm = NODE__RAWIP_SEND; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4415 | send_perm = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4416 | break; |
| 4417 | } |
| 4418 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4419 | err = sel_netif_sid(ifindex, &if_sid); |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4420 | if (err) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4421 | return err; |
| 4422 | err = avc_has_perm(sk_sid, if_sid, SECCLASS_NETIF, netif_perm, ad); |
| 4423 | return err; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4424 | |
Paul Moore | 224dfbd | 2008-01-29 08:38:13 -0500 | [diff] [blame] | 4425 | err = sel_netnode_sid(addrp, family, &node_sid); |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4426 | if (err) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4427 | return err; |
| 4428 | 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] | 4429 | if (err) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4430 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4431 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4432 | if (send_perm != 0) |
| 4433 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4434 | |
Paul Moore | 3e11217 | 2008-04-10 10:48:14 -0400 | [diff] [blame] | 4435 | err = sel_netport_sid(sk->sk_protocol, |
| 4436 | ntohs(ad->u.net.dport), &port_sid); |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 4437 | if (unlikely(err)) { |
| 4438 | printk(KERN_WARNING |
| 4439 | "SELinux: failure in" |
| 4440 | " selinux_ip_postroute_iptables_compat()," |
| 4441 | " network port label not found\n"); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4442 | return err; |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 4443 | } |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4444 | 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] | 4445 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4446 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4447 | static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb, |
| 4448 | int ifindex, |
| 4449 | struct avc_audit_data *ad, |
| 4450 | u16 family, |
| 4451 | char *addrp, |
| 4452 | u8 proto) |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4453 | { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4454 | struct sock *sk = skb->sk; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4455 | struct sk_security_struct *sksec; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4456 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4457 | if (sk == NULL) |
| 4458 | return NF_ACCEPT; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4459 | sksec = sk->sk_security; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4460 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4461 | if (selinux_compat_net) { |
| 4462 | if (selinux_ip_postroute_iptables_compat(skb->sk, ifindex, |
| 4463 | ad, family, addrp)) |
| 4464 | return NF_DROP; |
| 4465 | } else { |
| 4466 | if (avc_has_perm(sksec->sid, skb->secmark, |
| 4467 | SECCLASS_PACKET, PACKET__SEND, ad)) |
| 4468 | return NF_DROP; |
| 4469 | } |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4470 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4471 | if (selinux_policycap_netpeer) |
| 4472 | if (selinux_xfrm_postroute_last(sksec->sid, skb, ad, proto)) |
| 4473 | return NF_DROP; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4474 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4475 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4476 | } |
| 4477 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4478 | static unsigned int selinux_ip_postroute(struct sk_buff *skb, int ifindex, |
| 4479 | u16 family) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4480 | { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4481 | u32 secmark_perm; |
| 4482 | u32 peer_sid; |
| 4483 | struct sock *sk; |
| 4484 | struct avc_audit_data ad; |
| 4485 | char *addrp; |
| 4486 | u8 proto; |
| 4487 | u8 secmark_active; |
| 4488 | u8 peerlbl_active; |
| 4489 | |
| 4490 | AVC_AUDIT_DATA_INIT(&ad, NET); |
| 4491 | ad.u.net.netif = ifindex; |
| 4492 | ad.u.net.family = family; |
| 4493 | if (selinux_parse_skb(skb, &ad, &addrp, 0, &proto)) |
| 4494 | return NF_DROP; |
| 4495 | |
| 4496 | /* If any sort of compatibility mode is enabled then handoff processing |
| 4497 | * to the selinux_ip_postroute_compat() function to deal with the |
| 4498 | * special handling. We do this in an attempt to keep this function |
| 4499 | * as fast and as clean as possible. */ |
| 4500 | if (selinux_compat_net || !selinux_policycap_netpeer) |
| 4501 | return selinux_ip_postroute_compat(skb, ifindex, &ad, |
| 4502 | family, addrp, proto); |
| 4503 | |
| 4504 | /* If skb->dst->xfrm is non-NULL then the packet is undergoing an IPsec |
| 4505 | * packet transformation so allow the packet to pass without any checks |
| 4506 | * since we'll have another chance to perform access control checks |
| 4507 | * when the packet is on it's final way out. |
| 4508 | * NOTE: there appear to be some IPv6 multicast cases where skb->dst |
| 4509 | * is NULL, in this case go ahead and apply access control. */ |
| 4510 | if (skb->dst != NULL && skb->dst->xfrm != NULL) |
| 4511 | return NF_ACCEPT; |
| 4512 | |
| 4513 | secmark_active = selinux_secmark_enabled(); |
| 4514 | peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled(); |
| 4515 | if (!secmark_active && !peerlbl_active) |
| 4516 | return NF_ACCEPT; |
| 4517 | |
| 4518 | /* if the packet is locally generated (skb->sk != NULL) then use the |
| 4519 | * socket's label as the peer label, otherwise the packet is being |
| 4520 | * forwarded through this system and we need to fetch the peer label |
| 4521 | * directly from the packet */ |
| 4522 | sk = skb->sk; |
| 4523 | if (sk) { |
| 4524 | struct sk_security_struct *sksec = sk->sk_security; |
| 4525 | peer_sid = sksec->sid; |
| 4526 | secmark_perm = PACKET__SEND; |
| 4527 | } else { |
| 4528 | if (selinux_skb_peerlbl_sid(skb, family, &peer_sid)) |
| 4529 | return NF_DROP; |
| 4530 | secmark_perm = PACKET__FORWARD_OUT; |
| 4531 | } |
| 4532 | |
| 4533 | if (secmark_active) |
| 4534 | if (avc_has_perm(peer_sid, skb->secmark, |
| 4535 | SECCLASS_PACKET, secmark_perm, &ad)) |
| 4536 | return NF_DROP; |
| 4537 | |
| 4538 | if (peerlbl_active) { |
| 4539 | u32 if_sid; |
| 4540 | u32 node_sid; |
| 4541 | |
| 4542 | if (sel_netif_sid(ifindex, &if_sid)) |
| 4543 | return NF_DROP; |
| 4544 | if (avc_has_perm(peer_sid, if_sid, |
| 4545 | SECCLASS_NETIF, NETIF__EGRESS, &ad)) |
| 4546 | return NF_DROP; |
| 4547 | |
| 4548 | if (sel_netnode_sid(addrp, family, &node_sid)) |
| 4549 | return NF_DROP; |
| 4550 | if (avc_has_perm(peer_sid, node_sid, |
| 4551 | SECCLASS_NODE, NODE__SENDTO, &ad)) |
| 4552 | return NF_DROP; |
| 4553 | } |
| 4554 | |
| 4555 | return NF_ACCEPT; |
| 4556 | } |
| 4557 | |
| 4558 | static unsigned int selinux_ipv4_postroute(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_postroute(skb, out->ifindex, PF_INET); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4565 | } |
| 4566 | |
| 4567 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4568 | static unsigned int selinux_ipv6_postroute(unsigned int hooknum, |
| 4569 | struct sk_buff *skb, |
| 4570 | const struct net_device *in, |
| 4571 | const struct net_device *out, |
| 4572 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4573 | { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4574 | return selinux_ip_postroute(skb, out->ifindex, PF_INET6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4575 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4576 | #endif /* IPV6 */ |
| 4577 | |
| 4578 | #endif /* CONFIG_NETFILTER */ |
| 4579 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4580 | static int selinux_netlink_send(struct sock *sk, struct sk_buff *skb) |
| 4581 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4582 | int err; |
| 4583 | |
| 4584 | err = secondary_ops->netlink_send(sk, skb); |
| 4585 | if (err) |
| 4586 | return err; |
| 4587 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4588 | if (policydb_loaded_version >= POLICYDB_VERSION_NLCLASS) |
| 4589 | err = selinux_nlmsg_perm(sk, skb); |
| 4590 | |
| 4591 | return err; |
| 4592 | } |
| 4593 | |
Darrel Goeddel | c7bdb54 | 2006-06-27 13:26:11 -0700 | [diff] [blame] | 4594 | static int selinux_netlink_recv(struct sk_buff *skb, int capability) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4595 | { |
Darrel Goeddel | c7bdb54 | 2006-06-27 13:26:11 -0700 | [diff] [blame] | 4596 | int err; |
| 4597 | struct avc_audit_data ad; |
| 4598 | |
| 4599 | err = secondary_ops->netlink_recv(skb, capability); |
| 4600 | if (err) |
| 4601 | return err; |
| 4602 | |
| 4603 | AVC_AUDIT_DATA_INIT(&ad, CAP); |
| 4604 | ad.u.cap = capability; |
| 4605 | |
| 4606 | return avc_has_perm(NETLINK_CB(skb).sid, NETLINK_CB(skb).sid, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4607 | SECCLASS_CAPABILITY, CAP_TO_MASK(capability), &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4608 | } |
| 4609 | |
| 4610 | static int ipc_alloc_security(struct task_struct *task, |
| 4611 | struct kern_ipc_perm *perm, |
| 4612 | u16 sclass) |
| 4613 | { |
| 4614 | struct task_security_struct *tsec = task->security; |
| 4615 | struct ipc_security_struct *isec; |
| 4616 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 4617 | isec = kzalloc(sizeof(struct ipc_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4618 | if (!isec) |
| 4619 | return -ENOMEM; |
| 4620 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4621 | isec->sclass = sclass; |
Stephen Smalley | 9ac49d2 | 2006-02-01 03:05:56 -0800 | [diff] [blame] | 4622 | isec->sid = tsec->sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4623 | perm->security = isec; |
| 4624 | |
| 4625 | return 0; |
| 4626 | } |
| 4627 | |
| 4628 | static void ipc_free_security(struct kern_ipc_perm *perm) |
| 4629 | { |
| 4630 | struct ipc_security_struct *isec = perm->security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4631 | perm->security = NULL; |
| 4632 | kfree(isec); |
| 4633 | } |
| 4634 | |
| 4635 | static int msg_msg_alloc_security(struct msg_msg *msg) |
| 4636 | { |
| 4637 | struct msg_security_struct *msec; |
| 4638 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 4639 | msec = kzalloc(sizeof(struct msg_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4640 | if (!msec) |
| 4641 | return -ENOMEM; |
| 4642 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4643 | msec->sid = SECINITSID_UNLABELED; |
| 4644 | msg->security = msec; |
| 4645 | |
| 4646 | return 0; |
| 4647 | } |
| 4648 | |
| 4649 | static void msg_msg_free_security(struct msg_msg *msg) |
| 4650 | { |
| 4651 | struct msg_security_struct *msec = msg->security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4652 | |
| 4653 | msg->security = NULL; |
| 4654 | kfree(msec); |
| 4655 | } |
| 4656 | |
| 4657 | static int ipc_has_perm(struct kern_ipc_perm *ipc_perms, |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 4658 | u32 perms) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4659 | { |
| 4660 | struct task_security_struct *tsec; |
| 4661 | struct ipc_security_struct *isec; |
| 4662 | struct avc_audit_data ad; |
| 4663 | |
| 4664 | tsec = current->security; |
| 4665 | isec = ipc_perms->security; |
| 4666 | |
| 4667 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 4668 | ad.u.ipc_id = ipc_perms->key; |
| 4669 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 4670 | return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4671 | } |
| 4672 | |
| 4673 | static int selinux_msg_msg_alloc_security(struct msg_msg *msg) |
| 4674 | { |
| 4675 | return msg_msg_alloc_security(msg); |
| 4676 | } |
| 4677 | |
| 4678 | static void selinux_msg_msg_free_security(struct msg_msg *msg) |
| 4679 | { |
| 4680 | msg_msg_free_security(msg); |
| 4681 | } |
| 4682 | |
| 4683 | /* message queue security operations */ |
| 4684 | static int selinux_msg_queue_alloc_security(struct msg_queue *msq) |
| 4685 | { |
| 4686 | struct task_security_struct *tsec; |
| 4687 | struct ipc_security_struct *isec; |
| 4688 | struct avc_audit_data ad; |
| 4689 | int rc; |
| 4690 | |
| 4691 | rc = ipc_alloc_security(current, &msq->q_perm, SECCLASS_MSGQ); |
| 4692 | if (rc) |
| 4693 | return rc; |
| 4694 | |
| 4695 | tsec = current->security; |
| 4696 | isec = msq->q_perm.security; |
| 4697 | |
| 4698 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4699 | ad.u.ipc_id = msq->q_perm.key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4700 | |
| 4701 | rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ, |
| 4702 | MSGQ__CREATE, &ad); |
| 4703 | if (rc) { |
| 4704 | ipc_free_security(&msq->q_perm); |
| 4705 | return rc; |
| 4706 | } |
| 4707 | return 0; |
| 4708 | } |
| 4709 | |
| 4710 | static void selinux_msg_queue_free_security(struct msg_queue *msq) |
| 4711 | { |
| 4712 | ipc_free_security(&msq->q_perm); |
| 4713 | } |
| 4714 | |
| 4715 | static int selinux_msg_queue_associate(struct msg_queue *msq, int msqflg) |
| 4716 | { |
| 4717 | struct task_security_struct *tsec; |
| 4718 | struct ipc_security_struct *isec; |
| 4719 | struct avc_audit_data ad; |
| 4720 | |
| 4721 | tsec = current->security; |
| 4722 | isec = msq->q_perm.security; |
| 4723 | |
| 4724 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 4725 | ad.u.ipc_id = msq->q_perm.key; |
| 4726 | |
| 4727 | return avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ, |
| 4728 | MSGQ__ASSOCIATE, &ad); |
| 4729 | } |
| 4730 | |
| 4731 | static int selinux_msg_queue_msgctl(struct msg_queue *msq, int cmd) |
| 4732 | { |
| 4733 | int err; |
| 4734 | int perms; |
| 4735 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4736 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4737 | case IPC_INFO: |
| 4738 | case MSG_INFO: |
| 4739 | /* No specific object, just general system-wide information. */ |
| 4740 | return task_has_system(current, SYSTEM__IPC_INFO); |
| 4741 | case IPC_STAT: |
| 4742 | case MSG_STAT: |
| 4743 | perms = MSGQ__GETATTR | MSGQ__ASSOCIATE; |
| 4744 | break; |
| 4745 | case IPC_SET: |
| 4746 | perms = MSGQ__SETATTR; |
| 4747 | break; |
| 4748 | case IPC_RMID: |
| 4749 | perms = MSGQ__DESTROY; |
| 4750 | break; |
| 4751 | default: |
| 4752 | return 0; |
| 4753 | } |
| 4754 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 4755 | err = ipc_has_perm(&msq->q_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4756 | return err; |
| 4757 | } |
| 4758 | |
| 4759 | static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, int msqflg) |
| 4760 | { |
| 4761 | struct task_security_struct *tsec; |
| 4762 | struct ipc_security_struct *isec; |
| 4763 | struct msg_security_struct *msec; |
| 4764 | struct avc_audit_data ad; |
| 4765 | int rc; |
| 4766 | |
| 4767 | tsec = current->security; |
| 4768 | isec = msq->q_perm.security; |
| 4769 | msec = msg->security; |
| 4770 | |
| 4771 | /* |
| 4772 | * First time through, need to assign label to the message |
| 4773 | */ |
| 4774 | if (msec->sid == SECINITSID_UNLABELED) { |
| 4775 | /* |
| 4776 | * Compute new sid based on current process and |
| 4777 | * message queue this message will be stored in |
| 4778 | */ |
| 4779 | rc = security_transition_sid(tsec->sid, |
| 4780 | isec->sid, |
| 4781 | SECCLASS_MSG, |
| 4782 | &msec->sid); |
| 4783 | if (rc) |
| 4784 | return rc; |
| 4785 | } |
| 4786 | |
| 4787 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 4788 | ad.u.ipc_id = msq->q_perm.key; |
| 4789 | |
| 4790 | /* Can this process write to the queue? */ |
| 4791 | rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ, |
| 4792 | MSGQ__WRITE, &ad); |
| 4793 | if (!rc) |
| 4794 | /* Can this process send the message */ |
| 4795 | rc = avc_has_perm(tsec->sid, msec->sid, |
| 4796 | SECCLASS_MSG, MSG__SEND, &ad); |
| 4797 | if (!rc) |
| 4798 | /* Can the message be put in the queue? */ |
| 4799 | rc = avc_has_perm(msec->sid, isec->sid, |
| 4800 | SECCLASS_MSGQ, MSGQ__ENQUEUE, &ad); |
| 4801 | |
| 4802 | return rc; |
| 4803 | } |
| 4804 | |
| 4805 | static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, |
| 4806 | struct task_struct *target, |
| 4807 | long type, int mode) |
| 4808 | { |
| 4809 | struct task_security_struct *tsec; |
| 4810 | struct ipc_security_struct *isec; |
| 4811 | struct msg_security_struct *msec; |
| 4812 | struct avc_audit_data ad; |
| 4813 | int rc; |
| 4814 | |
| 4815 | tsec = target->security; |
| 4816 | isec = msq->q_perm.security; |
| 4817 | msec = msg->security; |
| 4818 | |
| 4819 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4820 | ad.u.ipc_id = msq->q_perm.key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4821 | |
| 4822 | rc = avc_has_perm(tsec->sid, isec->sid, |
| 4823 | SECCLASS_MSGQ, MSGQ__READ, &ad); |
| 4824 | if (!rc) |
| 4825 | rc = avc_has_perm(tsec->sid, msec->sid, |
| 4826 | SECCLASS_MSG, MSG__RECEIVE, &ad); |
| 4827 | return rc; |
| 4828 | } |
| 4829 | |
| 4830 | /* Shared Memory security operations */ |
| 4831 | static int selinux_shm_alloc_security(struct shmid_kernel *shp) |
| 4832 | { |
| 4833 | struct task_security_struct *tsec; |
| 4834 | struct ipc_security_struct *isec; |
| 4835 | struct avc_audit_data ad; |
| 4836 | int rc; |
| 4837 | |
| 4838 | rc = ipc_alloc_security(current, &shp->shm_perm, SECCLASS_SHM); |
| 4839 | if (rc) |
| 4840 | return rc; |
| 4841 | |
| 4842 | tsec = current->security; |
| 4843 | isec = shp->shm_perm.security; |
| 4844 | |
| 4845 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4846 | ad.u.ipc_id = shp->shm_perm.key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4847 | |
| 4848 | rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_SHM, |
| 4849 | SHM__CREATE, &ad); |
| 4850 | if (rc) { |
| 4851 | ipc_free_security(&shp->shm_perm); |
| 4852 | return rc; |
| 4853 | } |
| 4854 | return 0; |
| 4855 | } |
| 4856 | |
| 4857 | static void selinux_shm_free_security(struct shmid_kernel *shp) |
| 4858 | { |
| 4859 | ipc_free_security(&shp->shm_perm); |
| 4860 | } |
| 4861 | |
| 4862 | static int selinux_shm_associate(struct shmid_kernel *shp, int shmflg) |
| 4863 | { |
| 4864 | struct task_security_struct *tsec; |
| 4865 | struct ipc_security_struct *isec; |
| 4866 | struct avc_audit_data ad; |
| 4867 | |
| 4868 | tsec = current->security; |
| 4869 | isec = shp->shm_perm.security; |
| 4870 | |
| 4871 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 4872 | ad.u.ipc_id = shp->shm_perm.key; |
| 4873 | |
| 4874 | return avc_has_perm(tsec->sid, isec->sid, SECCLASS_SHM, |
| 4875 | SHM__ASSOCIATE, &ad); |
| 4876 | } |
| 4877 | |
| 4878 | /* Note, at this point, shp is locked down */ |
| 4879 | static int selinux_shm_shmctl(struct shmid_kernel *shp, int cmd) |
| 4880 | { |
| 4881 | int perms; |
| 4882 | int err; |
| 4883 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4884 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4885 | case IPC_INFO: |
| 4886 | case SHM_INFO: |
| 4887 | /* No specific object, just general system-wide information. */ |
| 4888 | return task_has_system(current, SYSTEM__IPC_INFO); |
| 4889 | case IPC_STAT: |
| 4890 | case SHM_STAT: |
| 4891 | perms = SHM__GETATTR | SHM__ASSOCIATE; |
| 4892 | break; |
| 4893 | case IPC_SET: |
| 4894 | perms = SHM__SETATTR; |
| 4895 | break; |
| 4896 | case SHM_LOCK: |
| 4897 | case SHM_UNLOCK: |
| 4898 | perms = SHM__LOCK; |
| 4899 | break; |
| 4900 | case IPC_RMID: |
| 4901 | perms = SHM__DESTROY; |
| 4902 | break; |
| 4903 | default: |
| 4904 | return 0; |
| 4905 | } |
| 4906 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 4907 | err = ipc_has_perm(&shp->shm_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4908 | return err; |
| 4909 | } |
| 4910 | |
| 4911 | static int selinux_shm_shmat(struct shmid_kernel *shp, |
| 4912 | char __user *shmaddr, int shmflg) |
| 4913 | { |
| 4914 | u32 perms; |
| 4915 | int rc; |
| 4916 | |
| 4917 | rc = secondary_ops->shm_shmat(shp, shmaddr, shmflg); |
| 4918 | if (rc) |
| 4919 | return rc; |
| 4920 | |
| 4921 | if (shmflg & SHM_RDONLY) |
| 4922 | perms = SHM__READ; |
| 4923 | else |
| 4924 | perms = SHM__READ | SHM__WRITE; |
| 4925 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 4926 | return ipc_has_perm(&shp->shm_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4927 | } |
| 4928 | |
| 4929 | /* Semaphore security operations */ |
| 4930 | static int selinux_sem_alloc_security(struct sem_array *sma) |
| 4931 | { |
| 4932 | struct task_security_struct *tsec; |
| 4933 | struct ipc_security_struct *isec; |
| 4934 | struct avc_audit_data ad; |
| 4935 | int rc; |
| 4936 | |
| 4937 | rc = ipc_alloc_security(current, &sma->sem_perm, SECCLASS_SEM); |
| 4938 | if (rc) |
| 4939 | return rc; |
| 4940 | |
| 4941 | tsec = current->security; |
| 4942 | isec = sma->sem_perm.security; |
| 4943 | |
| 4944 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4945 | ad.u.ipc_id = sma->sem_perm.key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4946 | |
| 4947 | rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_SEM, |
| 4948 | SEM__CREATE, &ad); |
| 4949 | if (rc) { |
| 4950 | ipc_free_security(&sma->sem_perm); |
| 4951 | return rc; |
| 4952 | } |
| 4953 | return 0; |
| 4954 | } |
| 4955 | |
| 4956 | static void selinux_sem_free_security(struct sem_array *sma) |
| 4957 | { |
| 4958 | ipc_free_security(&sma->sem_perm); |
| 4959 | } |
| 4960 | |
| 4961 | static int selinux_sem_associate(struct sem_array *sma, int semflg) |
| 4962 | { |
| 4963 | struct task_security_struct *tsec; |
| 4964 | struct ipc_security_struct *isec; |
| 4965 | struct avc_audit_data ad; |
| 4966 | |
| 4967 | tsec = current->security; |
| 4968 | isec = sma->sem_perm.security; |
| 4969 | |
| 4970 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 4971 | ad.u.ipc_id = sma->sem_perm.key; |
| 4972 | |
| 4973 | return avc_has_perm(tsec->sid, isec->sid, SECCLASS_SEM, |
| 4974 | SEM__ASSOCIATE, &ad); |
| 4975 | } |
| 4976 | |
| 4977 | /* Note, at this point, sma is locked down */ |
| 4978 | static int selinux_sem_semctl(struct sem_array *sma, int cmd) |
| 4979 | { |
| 4980 | int err; |
| 4981 | u32 perms; |
| 4982 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4983 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4984 | case IPC_INFO: |
| 4985 | case SEM_INFO: |
| 4986 | /* No specific object, just general system-wide information. */ |
| 4987 | return task_has_system(current, SYSTEM__IPC_INFO); |
| 4988 | case GETPID: |
| 4989 | case GETNCNT: |
| 4990 | case GETZCNT: |
| 4991 | perms = SEM__GETATTR; |
| 4992 | break; |
| 4993 | case GETVAL: |
| 4994 | case GETALL: |
| 4995 | perms = SEM__READ; |
| 4996 | break; |
| 4997 | case SETVAL: |
| 4998 | case SETALL: |
| 4999 | perms = SEM__WRITE; |
| 5000 | break; |
| 5001 | case IPC_RMID: |
| 5002 | perms = SEM__DESTROY; |
| 5003 | break; |
| 5004 | case IPC_SET: |
| 5005 | perms = SEM__SETATTR; |
| 5006 | break; |
| 5007 | case IPC_STAT: |
| 5008 | case SEM_STAT: |
| 5009 | perms = SEM__GETATTR | SEM__ASSOCIATE; |
| 5010 | break; |
| 5011 | default: |
| 5012 | return 0; |
| 5013 | } |
| 5014 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 5015 | err = ipc_has_perm(&sma->sem_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5016 | return err; |
| 5017 | } |
| 5018 | |
| 5019 | static int selinux_sem_semop(struct sem_array *sma, |
| 5020 | struct sembuf *sops, unsigned nsops, int alter) |
| 5021 | { |
| 5022 | u32 perms; |
| 5023 | |
| 5024 | if (alter) |
| 5025 | perms = SEM__READ | SEM__WRITE; |
| 5026 | else |
| 5027 | perms = SEM__READ; |
| 5028 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 5029 | return ipc_has_perm(&sma->sem_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5030 | } |
| 5031 | |
| 5032 | static int selinux_ipc_permission(struct kern_ipc_perm *ipcp, short flag) |
| 5033 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5034 | u32 av = 0; |
| 5035 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5036 | av = 0; |
| 5037 | if (flag & S_IRUGO) |
| 5038 | av |= IPC__UNIX_READ; |
| 5039 | if (flag & S_IWUGO) |
| 5040 | av |= IPC__UNIX_WRITE; |
| 5041 | |
| 5042 | if (av == 0) |
| 5043 | return 0; |
| 5044 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 5045 | return ipc_has_perm(ipcp, av); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5046 | } |
| 5047 | |
Ahmed S. Darwish | 713a04ae | 2008-03-01 21:52:30 +0200 | [diff] [blame] | 5048 | static void selinux_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid) |
| 5049 | { |
| 5050 | struct ipc_security_struct *isec = ipcp->security; |
| 5051 | *secid = isec->sid; |
| 5052 | } |
| 5053 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5054 | /* module stacking operations */ |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5055 | static int selinux_register_security(const char *name, struct security_operations *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5056 | { |
| 5057 | if (secondary_ops != original_ops) { |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5058 | printk(KERN_ERR "%s: There is already a secondary security " |
Harvey Harrison | dd6f953 | 2008-03-06 10:03:59 +1100 | [diff] [blame] | 5059 | "module registered.\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5060 | return -EINVAL; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5061 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5062 | |
| 5063 | secondary_ops = ops; |
| 5064 | |
| 5065 | printk(KERN_INFO "%s: Registering secondary module %s\n", |
Harvey Harrison | dd6f953 | 2008-03-06 10:03:59 +1100 | [diff] [blame] | 5066 | __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5067 | name); |
| 5068 | |
| 5069 | return 0; |
| 5070 | } |
| 5071 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5072 | static void selinux_d_instantiate(struct dentry *dentry, struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5073 | { |
| 5074 | if (inode) |
| 5075 | inode_doinit_with_dentry(inode, dentry); |
| 5076 | } |
| 5077 | |
| 5078 | static int selinux_getprocattr(struct task_struct *p, |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 5079 | char *name, char **value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5080 | { |
| 5081 | struct task_security_struct *tsec; |
Dustin Kirkland | 8c8570f | 2005-11-03 17:15:16 +0000 | [diff] [blame] | 5082 | u32 sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5083 | int error; |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 5084 | unsigned len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5085 | |
| 5086 | if (current != p) { |
| 5087 | error = task_has_perm(current, p, PROCESS__GETATTR); |
| 5088 | if (error) |
| 5089 | return error; |
| 5090 | } |
| 5091 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5092 | tsec = p->security; |
| 5093 | |
| 5094 | if (!strcmp(name, "current")) |
| 5095 | sid = tsec->sid; |
| 5096 | else if (!strcmp(name, "prev")) |
| 5097 | sid = tsec->osid; |
| 5098 | else if (!strcmp(name, "exec")) |
| 5099 | sid = tsec->exec_sid; |
| 5100 | else if (!strcmp(name, "fscreate")) |
| 5101 | sid = tsec->create_sid; |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5102 | else if (!strcmp(name, "keycreate")) |
| 5103 | sid = tsec->keycreate_sid; |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 5104 | else if (!strcmp(name, "sockcreate")) |
| 5105 | sid = tsec->sockcreate_sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5106 | else |
| 5107 | return -EINVAL; |
| 5108 | |
| 5109 | if (!sid) |
| 5110 | return 0; |
| 5111 | |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 5112 | error = security_sid_to_context(sid, value, &len); |
| 5113 | if (error) |
| 5114 | return error; |
| 5115 | return len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5116 | } |
| 5117 | |
| 5118 | static int selinux_setprocattr(struct task_struct *p, |
| 5119 | char *name, void *value, size_t size) |
| 5120 | { |
| 5121 | struct task_security_struct *tsec; |
Roland McGrath | 0356357 | 2008-03-26 15:46:39 -0700 | [diff] [blame] | 5122 | struct task_struct *tracer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5123 | u32 sid = 0; |
| 5124 | int error; |
| 5125 | char *str = value; |
| 5126 | |
| 5127 | if (current != p) { |
| 5128 | /* SELinux only allows a process to change its own |
| 5129 | security attributes. */ |
| 5130 | return -EACCES; |
| 5131 | } |
| 5132 | |
| 5133 | /* |
| 5134 | * Basic control over ability to set these attributes at all. |
| 5135 | * current == p, but we'll pass them separately in case the |
| 5136 | * above restriction is ever removed. |
| 5137 | */ |
| 5138 | if (!strcmp(name, "exec")) |
| 5139 | error = task_has_perm(current, p, PROCESS__SETEXEC); |
| 5140 | else if (!strcmp(name, "fscreate")) |
| 5141 | error = task_has_perm(current, p, PROCESS__SETFSCREATE); |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5142 | else if (!strcmp(name, "keycreate")) |
| 5143 | error = task_has_perm(current, p, PROCESS__SETKEYCREATE); |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 5144 | else if (!strcmp(name, "sockcreate")) |
| 5145 | error = task_has_perm(current, p, PROCESS__SETSOCKCREATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5146 | else if (!strcmp(name, "current")) |
| 5147 | error = task_has_perm(current, p, PROCESS__SETCURRENT); |
| 5148 | else |
| 5149 | error = -EINVAL; |
| 5150 | if (error) |
| 5151 | return error; |
| 5152 | |
| 5153 | /* Obtain a SID for the context, if one was specified. */ |
| 5154 | if (size && str[1] && str[1] != '\n') { |
| 5155 | if (str[size-1] == '\n') { |
| 5156 | str[size-1] = 0; |
| 5157 | size--; |
| 5158 | } |
| 5159 | error = security_context_to_sid(value, size, &sid); |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 5160 | if (error == -EINVAL && !strcmp(name, "fscreate")) { |
| 5161 | if (!capable(CAP_MAC_ADMIN)) |
| 5162 | return error; |
| 5163 | error = security_context_to_sid_force(value, size, |
| 5164 | &sid); |
| 5165 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5166 | if (error) |
| 5167 | return error; |
| 5168 | } |
| 5169 | |
| 5170 | /* Permission checking based on the specified context is |
| 5171 | performed during the actual operation (execve, |
| 5172 | open/mkdir/...), when we know the full context of the |
| 5173 | operation. See selinux_bprm_set_security for the execve |
| 5174 | checks and may_create for the file creation checks. The |
| 5175 | operation will then fail if the context is not permitted. */ |
| 5176 | tsec = p->security; |
| 5177 | if (!strcmp(name, "exec")) |
| 5178 | tsec->exec_sid = sid; |
| 5179 | else if (!strcmp(name, "fscreate")) |
| 5180 | tsec->create_sid = sid; |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5181 | else if (!strcmp(name, "keycreate")) { |
| 5182 | error = may_create_key(sid, p); |
| 5183 | if (error) |
| 5184 | return error; |
| 5185 | tsec->keycreate_sid = sid; |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 5186 | } else if (!strcmp(name, "sockcreate")) |
| 5187 | tsec->sockcreate_sid = sid; |
| 5188 | else if (!strcmp(name, "current")) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5189 | struct av_decision avd; |
| 5190 | |
| 5191 | if (sid == 0) |
| 5192 | return -EINVAL; |
| 5193 | |
| 5194 | /* Only allow single threaded processes to change context */ |
| 5195 | if (atomic_read(&p->mm->mm_users) != 1) { |
| 5196 | struct task_struct *g, *t; |
| 5197 | struct mm_struct *mm = p->mm; |
| 5198 | read_lock(&tasklist_lock); |
| 5199 | do_each_thread(g, t) |
| 5200 | if (t->mm == mm && t != p) { |
| 5201 | read_unlock(&tasklist_lock); |
| 5202 | return -EPERM; |
| 5203 | } |
| 5204 | while_each_thread(g, t); |
| 5205 | read_unlock(&tasklist_lock); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5206 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5207 | |
| 5208 | /* Check permissions for the transition. */ |
| 5209 | error = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5210 | PROCESS__DYNTRANSITION, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5211 | if (error) |
| 5212 | return error; |
| 5213 | |
| 5214 | /* Check for ptracing, and update the task SID if ok. |
| 5215 | Otherwise, leave SID unchanged and fail. */ |
| 5216 | task_lock(p); |
Roland McGrath | 0356357 | 2008-03-26 15:46:39 -0700 | [diff] [blame] | 5217 | rcu_read_lock(); |
| 5218 | tracer = task_tracer_task(p); |
| 5219 | if (tracer != NULL) { |
| 5220 | struct task_security_struct *ptsec = tracer->security; |
| 5221 | u32 ptsid = ptsec->sid; |
| 5222 | rcu_read_unlock(); |
| 5223 | error = avc_has_perm_noaudit(ptsid, sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5224 | SECCLASS_PROCESS, |
Stephen Smalley | 2c3c05d | 2007-06-07 15:34:10 -0400 | [diff] [blame] | 5225 | PROCESS__PTRACE, 0, &avd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5226 | if (!error) |
| 5227 | tsec->sid = sid; |
| 5228 | task_unlock(p); |
Roland McGrath | 0356357 | 2008-03-26 15:46:39 -0700 | [diff] [blame] | 5229 | avc_audit(ptsid, sid, SECCLASS_PROCESS, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5230 | PROCESS__PTRACE, &avd, error, NULL); |
| 5231 | if (error) |
| 5232 | return error; |
| 5233 | } else { |
Roland McGrath | 0356357 | 2008-03-26 15:46:39 -0700 | [diff] [blame] | 5234 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5235 | tsec->sid = sid; |
| 5236 | task_unlock(p); |
| 5237 | } |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5238 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5239 | return -EINVAL; |
| 5240 | |
| 5241 | return size; |
| 5242 | } |
| 5243 | |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5244 | static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) |
| 5245 | { |
| 5246 | return security_sid_to_context(secid, secdata, seclen); |
| 5247 | } |
| 5248 | |
David Howells | 7bf570d | 2008-04-29 20:52:51 +0100 | [diff] [blame] | 5249 | 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] | 5250 | { |
| 5251 | return security_context_to_sid(secdata, seclen, secid); |
| 5252 | } |
| 5253 | |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5254 | static void selinux_release_secctx(char *secdata, u32 seclen) |
| 5255 | { |
Paul Moore | 088999e | 2007-08-01 11:12:58 -0400 | [diff] [blame] | 5256 | kfree(secdata); |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5257 | } |
| 5258 | |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5259 | #ifdef CONFIG_KEYS |
| 5260 | |
David Howells | 7e047ef | 2006-06-26 00:24:50 -0700 | [diff] [blame] | 5261 | static int selinux_key_alloc(struct key *k, struct task_struct *tsk, |
| 5262 | unsigned long flags) |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5263 | { |
| 5264 | struct task_security_struct *tsec = tsk->security; |
| 5265 | struct key_security_struct *ksec; |
| 5266 | |
| 5267 | ksec = kzalloc(sizeof(struct key_security_struct), GFP_KERNEL); |
| 5268 | if (!ksec) |
| 5269 | return -ENOMEM; |
| 5270 | |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5271 | if (tsec->keycreate_sid) |
| 5272 | ksec->sid = tsec->keycreate_sid; |
| 5273 | else |
| 5274 | ksec->sid = tsec->sid; |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5275 | k->security = ksec; |
| 5276 | |
| 5277 | return 0; |
| 5278 | } |
| 5279 | |
| 5280 | static void selinux_key_free(struct key *k) |
| 5281 | { |
| 5282 | struct key_security_struct *ksec = k->security; |
| 5283 | |
| 5284 | k->security = NULL; |
| 5285 | kfree(ksec); |
| 5286 | } |
| 5287 | |
| 5288 | static int selinux_key_permission(key_ref_t key_ref, |
| 5289 | struct task_struct *ctx, |
| 5290 | key_perm_t perm) |
| 5291 | { |
| 5292 | struct key *key; |
| 5293 | struct task_security_struct *tsec; |
| 5294 | struct key_security_struct *ksec; |
| 5295 | |
| 5296 | key = key_ref_to_ptr(key_ref); |
| 5297 | |
| 5298 | tsec = ctx->security; |
| 5299 | ksec = key->security; |
| 5300 | |
| 5301 | /* if no specific permissions are requested, we skip the |
| 5302 | permission check. No serious, additional covert channels |
| 5303 | appear to be created. */ |
| 5304 | if (perm == 0) |
| 5305 | return 0; |
| 5306 | |
| 5307 | return avc_has_perm(tsec->sid, ksec->sid, |
| 5308 | SECCLASS_KEY, perm, NULL); |
| 5309 | } |
| 5310 | |
David Howells | 70a5bb7 | 2008-04-29 01:01:26 -0700 | [diff] [blame] | 5311 | static int selinux_key_getsecurity(struct key *key, char **_buffer) |
| 5312 | { |
| 5313 | struct key_security_struct *ksec = key->security; |
| 5314 | char *context = NULL; |
| 5315 | unsigned len; |
| 5316 | int rc; |
| 5317 | |
| 5318 | rc = security_sid_to_context(ksec->sid, &context, &len); |
| 5319 | if (!rc) |
| 5320 | rc = len; |
| 5321 | *_buffer = context; |
| 5322 | return rc; |
| 5323 | } |
| 5324 | |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5325 | #endif |
| 5326 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5327 | static struct security_operations selinux_ops = { |
Ahmed S. Darwish | 076c54c | 2008-03-06 18:09:10 +0200 | [diff] [blame] | 5328 | .name = "selinux", |
| 5329 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5330 | .ptrace = selinux_ptrace, |
| 5331 | .capget = selinux_capget, |
| 5332 | .capset_check = selinux_capset_check, |
| 5333 | .capset_set = selinux_capset_set, |
| 5334 | .sysctl = selinux_sysctl, |
| 5335 | .capable = selinux_capable, |
| 5336 | .quotactl = selinux_quotactl, |
| 5337 | .quota_on = selinux_quota_on, |
| 5338 | .syslog = selinux_syslog, |
| 5339 | .vm_enough_memory = selinux_vm_enough_memory, |
| 5340 | |
| 5341 | .netlink_send = selinux_netlink_send, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5342 | .netlink_recv = selinux_netlink_recv, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5343 | |
| 5344 | .bprm_alloc_security = selinux_bprm_alloc_security, |
| 5345 | .bprm_free_security = selinux_bprm_free_security, |
| 5346 | .bprm_apply_creds = selinux_bprm_apply_creds, |
| 5347 | .bprm_post_apply_creds = selinux_bprm_post_apply_creds, |
| 5348 | .bprm_set_security = selinux_bprm_set_security, |
| 5349 | .bprm_check_security = selinux_bprm_check_security, |
| 5350 | .bprm_secureexec = selinux_bprm_secureexec, |
| 5351 | |
| 5352 | .sb_alloc_security = selinux_sb_alloc_security, |
| 5353 | .sb_free_security = selinux_sb_free_security, |
| 5354 | .sb_copy_data = selinux_sb_copy_data, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5355 | .sb_kern_mount = selinux_sb_kern_mount, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5356 | .sb_statfs = selinux_sb_statfs, |
| 5357 | .sb_mount = selinux_mount, |
| 5358 | .sb_umount = selinux_umount, |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 5359 | .sb_get_mnt_opts = selinux_get_mnt_opts, |
| 5360 | .sb_set_mnt_opts = selinux_set_mnt_opts, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5361 | .sb_clone_mnt_opts = selinux_sb_clone_mnt_opts, |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 5362 | .sb_parse_opts_str = selinux_parse_opts_str, |
| 5363 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5364 | |
| 5365 | .inode_alloc_security = selinux_inode_alloc_security, |
| 5366 | .inode_free_security = selinux_inode_free_security, |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 5367 | .inode_init_security = selinux_inode_init_security, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5368 | .inode_create = selinux_inode_create, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5369 | .inode_link = selinux_inode_link, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5370 | .inode_unlink = selinux_inode_unlink, |
| 5371 | .inode_symlink = selinux_inode_symlink, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5372 | .inode_mkdir = selinux_inode_mkdir, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5373 | .inode_rmdir = selinux_inode_rmdir, |
| 5374 | .inode_mknod = selinux_inode_mknod, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5375 | .inode_rename = selinux_inode_rename, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5376 | .inode_readlink = selinux_inode_readlink, |
| 5377 | .inode_follow_link = selinux_inode_follow_link, |
| 5378 | .inode_permission = selinux_inode_permission, |
| 5379 | .inode_setattr = selinux_inode_setattr, |
| 5380 | .inode_getattr = selinux_inode_getattr, |
| 5381 | .inode_setxattr = selinux_inode_setxattr, |
| 5382 | .inode_post_setxattr = selinux_inode_post_setxattr, |
| 5383 | .inode_getxattr = selinux_inode_getxattr, |
| 5384 | .inode_listxattr = selinux_inode_listxattr, |
| 5385 | .inode_removexattr = selinux_inode_removexattr, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5386 | .inode_getsecurity = selinux_inode_getsecurity, |
| 5387 | .inode_setsecurity = selinux_inode_setsecurity, |
| 5388 | .inode_listsecurity = selinux_inode_listsecurity, |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 5389 | .inode_need_killpriv = selinux_inode_need_killpriv, |
| 5390 | .inode_killpriv = selinux_inode_killpriv, |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 5391 | .inode_getsecid = selinux_inode_getsecid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5392 | |
| 5393 | .file_permission = selinux_file_permission, |
| 5394 | .file_alloc_security = selinux_file_alloc_security, |
| 5395 | .file_free_security = selinux_file_free_security, |
| 5396 | .file_ioctl = selinux_file_ioctl, |
| 5397 | .file_mmap = selinux_file_mmap, |
| 5398 | .file_mprotect = selinux_file_mprotect, |
| 5399 | .file_lock = selinux_file_lock, |
| 5400 | .file_fcntl = selinux_file_fcntl, |
| 5401 | .file_set_fowner = selinux_file_set_fowner, |
| 5402 | .file_send_sigiotask = selinux_file_send_sigiotask, |
| 5403 | .file_receive = selinux_file_receive, |
| 5404 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5405 | .dentry_open = selinux_dentry_open, |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 5406 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5407 | .task_create = selinux_task_create, |
| 5408 | .task_alloc_security = selinux_task_alloc_security, |
| 5409 | .task_free_security = selinux_task_free_security, |
| 5410 | .task_setuid = selinux_task_setuid, |
| 5411 | .task_post_setuid = selinux_task_post_setuid, |
| 5412 | .task_setgid = selinux_task_setgid, |
| 5413 | .task_setpgid = selinux_task_setpgid, |
| 5414 | .task_getpgid = selinux_task_getpgid, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5415 | .task_getsid = selinux_task_getsid, |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 5416 | .task_getsecid = selinux_task_getsecid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5417 | .task_setgroups = selinux_task_setgroups, |
| 5418 | .task_setnice = selinux_task_setnice, |
James Morris | 03e6806 | 2006-06-23 02:03:58 -0700 | [diff] [blame] | 5419 | .task_setioprio = selinux_task_setioprio, |
David Quigley | a1836a4 | 2006-06-30 01:55:49 -0700 | [diff] [blame] | 5420 | .task_getioprio = selinux_task_getioprio, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5421 | .task_setrlimit = selinux_task_setrlimit, |
| 5422 | .task_setscheduler = selinux_task_setscheduler, |
| 5423 | .task_getscheduler = selinux_task_getscheduler, |
David Quigley | 3560154 | 2006-06-23 02:04:01 -0700 | [diff] [blame] | 5424 | .task_movememory = selinux_task_movememory, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5425 | .task_kill = selinux_task_kill, |
| 5426 | .task_wait = selinux_task_wait, |
| 5427 | .task_prctl = selinux_task_prctl, |
| 5428 | .task_reparent_to_init = selinux_task_reparent_to_init, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5429 | .task_to_inode = selinux_task_to_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5430 | |
| 5431 | .ipc_permission = selinux_ipc_permission, |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 5432 | .ipc_getsecid = selinux_ipc_getsecid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5433 | |
| 5434 | .msg_msg_alloc_security = selinux_msg_msg_alloc_security, |
| 5435 | .msg_msg_free_security = selinux_msg_msg_free_security, |
| 5436 | |
| 5437 | .msg_queue_alloc_security = selinux_msg_queue_alloc_security, |
| 5438 | .msg_queue_free_security = selinux_msg_queue_free_security, |
| 5439 | .msg_queue_associate = selinux_msg_queue_associate, |
| 5440 | .msg_queue_msgctl = selinux_msg_queue_msgctl, |
| 5441 | .msg_queue_msgsnd = selinux_msg_queue_msgsnd, |
| 5442 | .msg_queue_msgrcv = selinux_msg_queue_msgrcv, |
| 5443 | |
| 5444 | .shm_alloc_security = selinux_shm_alloc_security, |
| 5445 | .shm_free_security = selinux_shm_free_security, |
| 5446 | .shm_associate = selinux_shm_associate, |
| 5447 | .shm_shmctl = selinux_shm_shmctl, |
| 5448 | .shm_shmat = selinux_shm_shmat, |
| 5449 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5450 | .sem_alloc_security = selinux_sem_alloc_security, |
| 5451 | .sem_free_security = selinux_sem_free_security, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5452 | .sem_associate = selinux_sem_associate, |
| 5453 | .sem_semctl = selinux_sem_semctl, |
| 5454 | .sem_semop = selinux_sem_semop, |
| 5455 | |
| 5456 | .register_security = selinux_register_security, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5457 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5458 | .d_instantiate = selinux_d_instantiate, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5459 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5460 | .getprocattr = selinux_getprocattr, |
| 5461 | .setprocattr = selinux_setprocattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5462 | |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5463 | .secid_to_secctx = selinux_secid_to_secctx, |
David Howells | 63cb344 | 2008-01-15 23:47:35 +0000 | [diff] [blame] | 5464 | .secctx_to_secid = selinux_secctx_to_secid, |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5465 | .release_secctx = selinux_release_secctx, |
| 5466 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5467 | .unix_stream_connect = selinux_socket_unix_stream_connect, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5468 | .unix_may_send = selinux_socket_unix_may_send, |
| 5469 | |
| 5470 | .socket_create = selinux_socket_create, |
| 5471 | .socket_post_create = selinux_socket_post_create, |
| 5472 | .socket_bind = selinux_socket_bind, |
| 5473 | .socket_connect = selinux_socket_connect, |
| 5474 | .socket_listen = selinux_socket_listen, |
| 5475 | .socket_accept = selinux_socket_accept, |
| 5476 | .socket_sendmsg = selinux_socket_sendmsg, |
| 5477 | .socket_recvmsg = selinux_socket_recvmsg, |
| 5478 | .socket_getsockname = selinux_socket_getsockname, |
| 5479 | .socket_getpeername = selinux_socket_getpeername, |
| 5480 | .socket_getsockopt = selinux_socket_getsockopt, |
| 5481 | .socket_setsockopt = selinux_socket_setsockopt, |
| 5482 | .socket_shutdown = selinux_socket_shutdown, |
| 5483 | .socket_sock_rcv_skb = selinux_socket_sock_rcv_skb, |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 5484 | .socket_getpeersec_stream = selinux_socket_getpeersec_stream, |
| 5485 | .socket_getpeersec_dgram = selinux_socket_getpeersec_dgram, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5486 | .sk_alloc_security = selinux_sk_alloc_security, |
| 5487 | .sk_free_security = selinux_sk_free_security, |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 5488 | .sk_clone_security = selinux_sk_clone_security, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5489 | .sk_getsecid = selinux_sk_getsecid, |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 5490 | .sock_graft = selinux_sock_graft, |
| 5491 | .inet_conn_request = selinux_inet_conn_request, |
| 5492 | .inet_csk_clone = selinux_inet_csk_clone, |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 5493 | .inet_conn_established = selinux_inet_conn_established, |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 5494 | .req_classify_flow = selinux_req_classify_flow, |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 5495 | |
| 5496 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
| 5497 | .xfrm_policy_alloc_security = selinux_xfrm_policy_alloc, |
| 5498 | .xfrm_policy_clone_security = selinux_xfrm_policy_clone, |
| 5499 | .xfrm_policy_free_security = selinux_xfrm_policy_free, |
Catherine Zhang | c8c05a8 | 2006-06-08 23:39:49 -0700 | [diff] [blame] | 5500 | .xfrm_policy_delete_security = selinux_xfrm_policy_delete, |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 5501 | .xfrm_state_alloc_security = selinux_xfrm_state_alloc, |
| 5502 | .xfrm_state_free_security = selinux_xfrm_state_free, |
Catherine Zhang | c8c05a8 | 2006-06-08 23:39:49 -0700 | [diff] [blame] | 5503 | .xfrm_state_delete_security = selinux_xfrm_state_delete, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5504 | .xfrm_policy_lookup = selinux_xfrm_policy_lookup, |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 5505 | .xfrm_state_pol_flow_match = selinux_xfrm_state_pol_flow_match, |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 5506 | .xfrm_decode_session = selinux_xfrm_decode_session, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5507 | #endif |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5508 | |
| 5509 | #ifdef CONFIG_KEYS |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5510 | .key_alloc = selinux_key_alloc, |
| 5511 | .key_free = selinux_key_free, |
| 5512 | .key_permission = selinux_key_permission, |
David Howells | 70a5bb7 | 2008-04-29 01:01:26 -0700 | [diff] [blame] | 5513 | .key_getsecurity = selinux_key_getsecurity, |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5514 | #endif |
Ahmed S. Darwish | 9d57a7f | 2008-03-01 22:03:14 +0200 | [diff] [blame] | 5515 | |
| 5516 | #ifdef CONFIG_AUDIT |
| 5517 | .audit_rule_init = selinux_audit_rule_init, |
| 5518 | .audit_rule_known = selinux_audit_rule_known, |
| 5519 | .audit_rule_match = selinux_audit_rule_match, |
| 5520 | .audit_rule_free = selinux_audit_rule_free, |
| 5521 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5522 | }; |
| 5523 | |
| 5524 | static __init int selinux_init(void) |
| 5525 | { |
| 5526 | struct task_security_struct *tsec; |
| 5527 | |
Ahmed S. Darwish | 076c54c | 2008-03-06 18:09:10 +0200 | [diff] [blame] | 5528 | if (!security_module_enable(&selinux_ops)) { |
| 5529 | selinux_enabled = 0; |
| 5530 | return 0; |
| 5531 | } |
| 5532 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5533 | if (!selinux_enabled) { |
| 5534 | printk(KERN_INFO "SELinux: Disabled at boot.\n"); |
| 5535 | return 0; |
| 5536 | } |
| 5537 | |
| 5538 | printk(KERN_INFO "SELinux: Initializing.\n"); |
| 5539 | |
| 5540 | /* Set the security state for the initial task. */ |
| 5541 | if (task_alloc_security(current)) |
| 5542 | panic("SELinux: Failed to initialize initial task.\n"); |
| 5543 | tsec = current->security; |
| 5544 | tsec->osid = tsec->sid = SECINITSID_KERNEL; |
| 5545 | |
James Morris | 7cae7e2 | 2006-03-22 00:09:22 -0800 | [diff] [blame] | 5546 | sel_inode_cache = kmem_cache_create("selinux_inode_security", |
| 5547 | sizeof(struct inode_security_struct), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 5548 | 0, SLAB_PANIC, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5549 | avc_init(); |
| 5550 | |
| 5551 | original_ops = secondary_ops = security_ops; |
| 5552 | if (!secondary_ops) |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5553 | panic("SELinux: No initial security operations\n"); |
| 5554 | if (register_security(&selinux_ops)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5555 | panic("SELinux: Unable to register with kernel.\n"); |
| 5556 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5557 | if (selinux_enforcing) |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5558 | printk(KERN_DEBUG "SELinux: Starting in enforcing mode\n"); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5559 | else |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5560 | printk(KERN_DEBUG "SELinux: Starting in permissive mode\n"); |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5561 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5562 | return 0; |
| 5563 | } |
| 5564 | |
| 5565 | void selinux_complete_init(void) |
| 5566 | { |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5567 | printk(KERN_DEBUG "SELinux: Completing initialization.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5568 | |
| 5569 | /* Set up any superblocks initialized prior to the policy load. */ |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5570 | printk(KERN_DEBUG "SELinux: Setting up existing superblocks.\n"); |
Stephen Smalley | ba0c19e | 2006-06-04 02:51:30 -0700 | [diff] [blame] | 5571 | spin_lock(&sb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5572 | spin_lock(&sb_security_lock); |
| 5573 | next_sb: |
| 5574 | if (!list_empty(&superblock_security_head)) { |
| 5575 | struct superblock_security_struct *sbsec = |
| 5576 | list_entry(superblock_security_head.next, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5577 | struct superblock_security_struct, |
| 5578 | list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5579 | struct super_block *sb = sbsec->sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5580 | sb->s_count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5581 | spin_unlock(&sb_security_lock); |
Stephen Smalley | ba0c19e | 2006-06-04 02:51:30 -0700 | [diff] [blame] | 5582 | spin_unlock(&sb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5583 | down_read(&sb->s_umount); |
| 5584 | if (sb->s_root) |
| 5585 | superblock_doinit(sb, NULL); |
| 5586 | drop_super(sb); |
Stephen Smalley | ba0c19e | 2006-06-04 02:51:30 -0700 | [diff] [blame] | 5587 | spin_lock(&sb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5588 | spin_lock(&sb_security_lock); |
| 5589 | list_del_init(&sbsec->list); |
| 5590 | goto next_sb; |
| 5591 | } |
| 5592 | spin_unlock(&sb_security_lock); |
Stephen Smalley | ba0c19e | 2006-06-04 02:51:30 -0700 | [diff] [blame] | 5593 | spin_unlock(&sb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5594 | } |
| 5595 | |
| 5596 | /* SELinux requires early initialization in order to label |
| 5597 | all processes and objects when they are created. */ |
| 5598 | security_initcall(selinux_init); |
| 5599 | |
Stephen Smalley | c2b507f | 2006-02-04 23:27:50 -0800 | [diff] [blame] | 5600 | #if defined(CONFIG_NETFILTER) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5601 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5602 | static struct nf_hook_ops selinux_ipv4_ops[] = { |
| 5603 | { |
| 5604 | .hook = selinux_ipv4_postroute, |
| 5605 | .owner = THIS_MODULE, |
| 5606 | .pf = PF_INET, |
| 5607 | .hooknum = NF_INET_POST_ROUTING, |
| 5608 | .priority = NF_IP_PRI_SELINUX_LAST, |
| 5609 | }, |
| 5610 | { |
| 5611 | .hook = selinux_ipv4_forward, |
| 5612 | .owner = THIS_MODULE, |
| 5613 | .pf = PF_INET, |
| 5614 | .hooknum = NF_INET_FORWARD, |
| 5615 | .priority = NF_IP_PRI_SELINUX_FIRST, |
| 5616 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5617 | }; |
| 5618 | |
| 5619 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 5620 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5621 | static struct nf_hook_ops selinux_ipv6_ops[] = { |
| 5622 | { |
| 5623 | .hook = selinux_ipv6_postroute, |
| 5624 | .owner = THIS_MODULE, |
| 5625 | .pf = PF_INET6, |
| 5626 | .hooknum = NF_INET_POST_ROUTING, |
| 5627 | .priority = NF_IP6_PRI_SELINUX_LAST, |
| 5628 | }, |
| 5629 | { |
| 5630 | .hook = selinux_ipv6_forward, |
| 5631 | .owner = THIS_MODULE, |
| 5632 | .pf = PF_INET6, |
| 5633 | .hooknum = NF_INET_FORWARD, |
| 5634 | .priority = NF_IP6_PRI_SELINUX_FIRST, |
| 5635 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5636 | }; |
| 5637 | |
| 5638 | #endif /* IPV6 */ |
| 5639 | |
| 5640 | static int __init selinux_nf_ip_init(void) |
| 5641 | { |
| 5642 | int err = 0; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5643 | u32 iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5644 | |
| 5645 | if (!selinux_enabled) |
| 5646 | goto out; |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5647 | |
| 5648 | printk(KERN_DEBUG "SELinux: Registering netfilter hooks\n"); |
| 5649 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5650 | for (iter = 0; iter < ARRAY_SIZE(selinux_ipv4_ops); iter++) { |
| 5651 | err = nf_register_hook(&selinux_ipv4_ops[iter]); |
| 5652 | if (err) |
| 5653 | panic("SELinux: nf_register_hook for IPv4: error %d\n", |
| 5654 | err); |
| 5655 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5656 | |
| 5657 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5658 | for (iter = 0; iter < ARRAY_SIZE(selinux_ipv6_ops); iter++) { |
| 5659 | err = nf_register_hook(&selinux_ipv6_ops[iter]); |
| 5660 | if (err) |
| 5661 | panic("SELinux: nf_register_hook for IPv6: error %d\n", |
| 5662 | err); |
| 5663 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5664 | #endif /* IPV6 */ |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 5665 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5666 | out: |
| 5667 | return err; |
| 5668 | } |
| 5669 | |
| 5670 | __initcall(selinux_nf_ip_init); |
| 5671 | |
| 5672 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
| 5673 | static void selinux_nf_ip_exit(void) |
| 5674 | { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5675 | u32 iter; |
| 5676 | |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5677 | printk(KERN_DEBUG "SELinux: Unregistering netfilter hooks\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5678 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5679 | for (iter = 0; iter < ARRAY_SIZE(selinux_ipv4_ops); iter++) |
| 5680 | nf_unregister_hook(&selinux_ipv4_ops[iter]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5681 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5682 | for (iter = 0; iter < ARRAY_SIZE(selinux_ipv6_ops); iter++) |
| 5683 | nf_unregister_hook(&selinux_ipv6_ops[iter]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5684 | #endif /* IPV6 */ |
| 5685 | } |
| 5686 | #endif |
| 5687 | |
Stephen Smalley | c2b507f | 2006-02-04 23:27:50 -0800 | [diff] [blame] | 5688 | #else /* CONFIG_NETFILTER */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5689 | |
| 5690 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
| 5691 | #define selinux_nf_ip_exit() |
| 5692 | #endif |
| 5693 | |
Stephen Smalley | c2b507f | 2006-02-04 23:27:50 -0800 | [diff] [blame] | 5694 | #endif /* CONFIG_NETFILTER */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5695 | |
| 5696 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5697 | static int selinux_disabled; |
| 5698 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5699 | int selinux_disable(void) |
| 5700 | { |
| 5701 | extern void exit_sel_fs(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5702 | |
| 5703 | if (ss_initialized) { |
| 5704 | /* Not permitted after initial policy load. */ |
| 5705 | return -EINVAL; |
| 5706 | } |
| 5707 | |
| 5708 | if (selinux_disabled) { |
| 5709 | /* Only do this once. */ |
| 5710 | return -EINVAL; |
| 5711 | } |
| 5712 | |
| 5713 | printk(KERN_INFO "SELinux: Disabled at runtime.\n"); |
| 5714 | |
| 5715 | selinux_disabled = 1; |
Stephen Smalley | 30d5528 | 2006-05-03 10:52:36 -0400 | [diff] [blame] | 5716 | selinux_enabled = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5717 | |
| 5718 | /* Reset security_ops to the secondary module, dummy or capability. */ |
| 5719 | security_ops = secondary_ops; |
| 5720 | |
| 5721 | /* Unregister netfilter hooks. */ |
| 5722 | selinux_nf_ip_exit(); |
| 5723 | |
| 5724 | /* Unregister selinuxfs. */ |
| 5725 | exit_sel_fs(); |
| 5726 | |
| 5727 | return 0; |
| 5728 | } |
| 5729 | #endif |