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> |
| 7 | * Chris Vance, <cvance@nai.com> |
| 8 | * Wayne Salamon, <wsalamon@nai.com> |
| 9 | * James Morris <jmorris@redhat.com> |
| 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. |
| 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. |
| 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. |
| 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, |
| 22 | * as published by the Free Software Foundation. |
| 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> |
| 42 | #include <linux/namei.h> |
| 43 | #include <linux/mount.h> |
| 44 | #include <linux/ext2_fs.h> |
| 45 | #include <linux/proc_fs.h> |
| 46 | #include <linux/kd.h> |
| 47 | #include <linux/netfilter_ipv4.h> |
| 48 | #include <linux/netfilter_ipv6.h> |
| 49 | #include <linux/tty.h> |
| 50 | #include <net/icmp.h> |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 51 | #include <net/ip.h> /* for local_port_range[] */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | #include <net/tcp.h> /* struct or_callable used in sock_rcv_skb */ |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 53 | #include <net/net_namespace.h> |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 54 | #include <net/netlabel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | #include <asm/ioctls.h> |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 57 | #include <asm/atomic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | #include <linux/bitops.h> |
| 59 | #include <linux/interrupt.h> |
| 60 | #include <linux/netdevice.h> /* for network interface checks */ |
| 61 | #include <linux/netlink.h> |
| 62 | #include <linux/tcp.h> |
| 63 | #include <linux/udp.h> |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 64 | #include <linux/dccp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | #include <linux/quota.h> |
| 66 | #include <linux/un.h> /* for Unix socket types */ |
| 67 | #include <net/af_unix.h> /* for Unix socket types */ |
| 68 | #include <linux/parser.h> |
| 69 | #include <linux/nfs_mount.h> |
| 70 | #include <net/ipv6.h> |
| 71 | #include <linux/hugetlb.h> |
| 72 | #include <linux/personality.h> |
| 73 | #include <linux/sysctl.h> |
| 74 | #include <linux/audit.h> |
Eric Paris | 6931dfc | 2005-06-30 02:58:51 -0700 | [diff] [blame] | 75 | #include <linux/string.h> |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 76 | #include <linux/selinux.h> |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 77 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
| 79 | #include "avc.h" |
| 80 | #include "objsec.h" |
| 81 | #include "netif.h" |
Paul Moore | 224dfbd | 2008-01-29 08:38:13 -0500 | [diff] [blame] | 82 | #include "netnode.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" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | |
| 86 | #define XATTR_SELINUX_SUFFIX "selinux" |
| 87 | #define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX |
| 88 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 89 | #define NUM_SEL_MNT_OPTS 4 |
| 90 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | extern unsigned int policydb_loaded_version; |
| 92 | extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm); |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 93 | extern int selinux_compat_net; |
James Morris | 20510f2 | 2007-10-16 23:31:32 -0700 | [diff] [blame] | 94 | extern struct security_operations *security_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 96 | /* SECMARK reference count */ |
| 97 | atomic_t selinux_secmark_refcount = ATOMIC_INIT(0); |
| 98 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP |
| 100 | int selinux_enforcing = 0; |
| 101 | |
| 102 | static int __init enforcing_setup(char *str) |
| 103 | { |
| 104 | selinux_enforcing = simple_strtol(str,NULL,0); |
| 105 | return 1; |
| 106 | } |
| 107 | __setup("enforcing=", enforcing_setup); |
| 108 | #endif |
| 109 | |
| 110 | #ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM |
| 111 | int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE; |
| 112 | |
| 113 | static int __init selinux_enabled_setup(char *str) |
| 114 | { |
| 115 | selinux_enabled = simple_strtol(str, NULL, 0); |
| 116 | return 1; |
| 117 | } |
| 118 | __setup("selinux=", selinux_enabled_setup); |
Stephen Smalley | 30d5528 | 2006-05-03 10:52:36 -0400 | [diff] [blame] | 119 | #else |
| 120 | int selinux_enabled = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | #endif |
| 122 | |
| 123 | /* Original (dummy) security module. */ |
| 124 | static struct security_operations *original_ops = NULL; |
| 125 | |
| 126 | /* Minimal support for a secondary security module, |
| 127 | just to allow the use of the dummy or capability modules. |
| 128 | The owlsm module can alternatively be used as a secondary |
| 129 | module as long as CONFIG_OWLSM_FD is not enabled. */ |
| 130 | static struct security_operations *secondary_ops = NULL; |
| 131 | |
| 132 | /* Lists of inode and superblock security structures initialized |
| 133 | before the policy was loaded. */ |
| 134 | static LIST_HEAD(superblock_security_head); |
| 135 | static DEFINE_SPINLOCK(sb_security_lock); |
| 136 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 137 | static struct kmem_cache *sel_inode_cache; |
James Morris | 7cae7e2 | 2006-03-22 00:09:22 -0800 | [diff] [blame] | 138 | |
Dustin Kirkland | 8c8570f | 2005-11-03 17:15:16 +0000 | [diff] [blame] | 139 | /* Return security context for a given sid or just the context |
| 140 | length if the buffer is null or length is 0 */ |
| 141 | static int selinux_getsecurity(u32 sid, void *buffer, size_t size) |
| 142 | { |
| 143 | char *context; |
| 144 | unsigned len; |
| 145 | int rc; |
| 146 | |
| 147 | rc = security_sid_to_context(sid, &context, &len); |
| 148 | if (rc) |
| 149 | return rc; |
| 150 | |
| 151 | if (!buffer || !size) |
| 152 | goto getsecurity_exit; |
| 153 | |
| 154 | if (size < len) { |
| 155 | len = -ERANGE; |
| 156 | goto getsecurity_exit; |
| 157 | } |
| 158 | memcpy(buffer, context, len); |
| 159 | |
| 160 | getsecurity_exit: |
| 161 | kfree(context); |
| 162 | return len; |
| 163 | } |
| 164 | |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 165 | /** |
| 166 | * selinux_secmark_enabled - Check to see if SECMARK is currently enabled |
| 167 | * |
| 168 | * Description: |
| 169 | * This function checks the SECMARK reference counter to see if any SECMARK |
| 170 | * targets are currently configured, if the reference counter is greater than |
| 171 | * zero SECMARK is considered to be enabled. Returns true (1) if SECMARK is |
| 172 | * enabled, false (0) if SECMARK is disabled. |
| 173 | * |
| 174 | */ |
| 175 | static int selinux_secmark_enabled(void) |
| 176 | { |
| 177 | return (atomic_read(&selinux_secmark_refcount) > 0); |
| 178 | } |
| 179 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | /* Allocate and free functions for each kind of security blob. */ |
| 181 | |
| 182 | static int task_alloc_security(struct task_struct *task) |
| 183 | { |
| 184 | struct task_security_struct *tsec; |
| 185 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 186 | tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | if (!tsec) |
| 188 | return -ENOMEM; |
| 189 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | tsec->task = task; |
| 191 | tsec->osid = tsec->sid = tsec->ptrace_sid = SECINITSID_UNLABELED; |
| 192 | task->security = tsec; |
| 193 | |
| 194 | return 0; |
| 195 | } |
| 196 | |
| 197 | static void task_free_security(struct task_struct *task) |
| 198 | { |
| 199 | struct task_security_struct *tsec = task->security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | task->security = NULL; |
| 201 | kfree(tsec); |
| 202 | } |
| 203 | |
| 204 | static int inode_alloc_security(struct inode *inode) |
| 205 | { |
| 206 | struct task_security_struct *tsec = current->security; |
| 207 | struct inode_security_struct *isec; |
| 208 | |
Robert P. J. Day | c376222 | 2007-02-10 01:45:03 -0800 | [diff] [blame] | 209 | isec = kmem_cache_zalloc(sel_inode_cache, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | if (!isec) |
| 211 | return -ENOMEM; |
| 212 | |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 213 | mutex_init(&isec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | INIT_LIST_HEAD(&isec->list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | isec->inode = inode; |
| 216 | isec->sid = SECINITSID_UNLABELED; |
| 217 | isec->sclass = SECCLASS_FILE; |
Stephen Smalley | 9ac49d2 | 2006-02-01 03:05:56 -0800 | [diff] [blame] | 218 | isec->task_sid = tsec->sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | inode->i_security = isec; |
| 220 | |
| 221 | return 0; |
| 222 | } |
| 223 | |
| 224 | static void inode_free_security(struct inode *inode) |
| 225 | { |
| 226 | struct inode_security_struct *isec = inode->i_security; |
| 227 | struct superblock_security_struct *sbsec = inode->i_sb->s_security; |
| 228 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | spin_lock(&sbsec->isec_lock); |
| 230 | if (!list_empty(&isec->list)) |
| 231 | list_del_init(&isec->list); |
| 232 | spin_unlock(&sbsec->isec_lock); |
| 233 | |
| 234 | inode->i_security = NULL; |
James Morris | 7cae7e2 | 2006-03-22 00:09:22 -0800 | [diff] [blame] | 235 | kmem_cache_free(sel_inode_cache, isec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | } |
| 237 | |
| 238 | static int file_alloc_security(struct file *file) |
| 239 | { |
| 240 | struct task_security_struct *tsec = current->security; |
| 241 | struct file_security_struct *fsec; |
| 242 | |
Stephen Smalley | 26d2a4b | 2006-02-01 03:05:55 -0800 | [diff] [blame] | 243 | fsec = kzalloc(sizeof(struct file_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | if (!fsec) |
| 245 | return -ENOMEM; |
| 246 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | fsec->file = file; |
Stephen Smalley | 9ac49d2 | 2006-02-01 03:05:56 -0800 | [diff] [blame] | 248 | fsec->sid = tsec->sid; |
| 249 | fsec->fown_sid = tsec->sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | file->f_security = fsec; |
| 251 | |
| 252 | return 0; |
| 253 | } |
| 254 | |
| 255 | static void file_free_security(struct file *file) |
| 256 | { |
| 257 | struct file_security_struct *fsec = file->f_security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | file->f_security = NULL; |
| 259 | kfree(fsec); |
| 260 | } |
| 261 | |
| 262 | static int superblock_alloc_security(struct super_block *sb) |
| 263 | { |
| 264 | struct superblock_security_struct *sbsec; |
| 265 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 266 | sbsec = kzalloc(sizeof(struct superblock_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | if (!sbsec) |
| 268 | return -ENOMEM; |
| 269 | |
Eric Paris | bc7e982 | 2006-09-25 23:32:02 -0700 | [diff] [blame] | 270 | mutex_init(&sbsec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | INIT_LIST_HEAD(&sbsec->list); |
| 272 | INIT_LIST_HEAD(&sbsec->isec_head); |
| 273 | spin_lock_init(&sbsec->isec_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | sbsec->sb = sb; |
| 275 | sbsec->sid = SECINITSID_UNLABELED; |
| 276 | sbsec->def_sid = SECINITSID_FILE; |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 277 | sbsec->mntpoint_sid = SECINITSID_UNLABELED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | sb->s_security = sbsec; |
| 279 | |
| 280 | return 0; |
| 281 | } |
| 282 | |
| 283 | static void superblock_free_security(struct super_block *sb) |
| 284 | { |
| 285 | struct superblock_security_struct *sbsec = sb->s_security; |
| 286 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | spin_lock(&sb_security_lock); |
| 288 | if (!list_empty(&sbsec->list)) |
| 289 | list_del_init(&sbsec->list); |
| 290 | spin_unlock(&sb_security_lock); |
| 291 | |
| 292 | sb->s_security = NULL; |
| 293 | kfree(sbsec); |
| 294 | } |
| 295 | |
Al Viro | 7d877f3 | 2005-10-21 03:20:43 -0400 | [diff] [blame] | 296 | 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] | 297 | { |
| 298 | struct sk_security_struct *ssec; |
| 299 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 300 | ssec = kzalloc(sizeof(*ssec), priority); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | if (!ssec) |
| 302 | return -ENOMEM; |
| 303 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | ssec->sk = sk; |
| 305 | ssec->peer_sid = SECINITSID_UNLABELED; |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 306 | ssec->sid = SECINITSID_UNLABELED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | sk->sk_security = ssec; |
| 308 | |
Paul Moore | 99f59ed | 2006-08-29 17:53:48 -0700 | [diff] [blame] | 309 | selinux_netlbl_sk_security_init(ssec, family); |
| 310 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | return 0; |
| 312 | } |
| 313 | |
| 314 | static void sk_free_security(struct sock *sk) |
| 315 | { |
| 316 | struct sk_security_struct *ssec = sk->sk_security; |
| 317 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | sk->sk_security = NULL; |
| 319 | kfree(ssec); |
| 320 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | |
| 322 | /* The security server must be initialized before |
| 323 | any labeling or access decisions can be provided. */ |
| 324 | extern int ss_initialized; |
| 325 | |
| 326 | /* The file system's label must be initialized prior to use. */ |
| 327 | |
| 328 | static char *labeling_behaviors[6] = { |
| 329 | "uses xattr", |
| 330 | "uses transition SIDs", |
| 331 | "uses task SIDs", |
| 332 | "uses genfs_contexts", |
| 333 | "not configured for labeling", |
| 334 | "uses mountpoint labeling", |
| 335 | }; |
| 336 | |
| 337 | static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry); |
| 338 | |
| 339 | static inline int inode_doinit(struct inode *inode) |
| 340 | { |
| 341 | return inode_doinit_with_dentry(inode, NULL); |
| 342 | } |
| 343 | |
| 344 | enum { |
Eric Paris | 31e8793 | 2007-09-19 17:19:12 -0400 | [diff] [blame] | 345 | Opt_error = -1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | Opt_context = 1, |
| 347 | Opt_fscontext = 2, |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 348 | Opt_defcontext = 3, |
| 349 | Opt_rootcontext = 4, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | }; |
| 351 | |
| 352 | static match_table_t tokens = { |
| 353 | {Opt_context, "context=%s"}, |
| 354 | {Opt_fscontext, "fscontext=%s"}, |
| 355 | {Opt_defcontext, "defcontext=%s"}, |
Eric Paris | 0808925 | 2006-07-10 04:43:55 -0700 | [diff] [blame] | 356 | {Opt_rootcontext, "rootcontext=%s"}, |
Eric Paris | 31e8793 | 2007-09-19 17:19:12 -0400 | [diff] [blame] | 357 | {Opt_error, NULL}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | }; |
| 359 | |
| 360 | #define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n" |
| 361 | |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 362 | static int may_context_mount_sb_relabel(u32 sid, |
| 363 | struct superblock_security_struct *sbsec, |
| 364 | struct task_security_struct *tsec) |
| 365 | { |
| 366 | int rc; |
| 367 | |
| 368 | rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, |
| 369 | FILESYSTEM__RELABELFROM, NULL); |
| 370 | if (rc) |
| 371 | return rc; |
| 372 | |
| 373 | rc = avc_has_perm(tsec->sid, sid, SECCLASS_FILESYSTEM, |
| 374 | FILESYSTEM__RELABELTO, NULL); |
| 375 | return rc; |
| 376 | } |
| 377 | |
Eric Paris | 0808925 | 2006-07-10 04:43:55 -0700 | [diff] [blame] | 378 | static int may_context_mount_inode_relabel(u32 sid, |
| 379 | struct superblock_security_struct *sbsec, |
| 380 | struct task_security_struct *tsec) |
| 381 | { |
| 382 | int rc; |
| 383 | rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, |
| 384 | FILESYSTEM__RELABELFROM, NULL); |
| 385 | if (rc) |
| 386 | return rc; |
| 387 | |
| 388 | rc = avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, |
| 389 | FILESYSTEM__ASSOCIATE, NULL); |
| 390 | return rc; |
| 391 | } |
| 392 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 393 | static int sb_finish_set_opts(struct super_block *sb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | { |
| 395 | struct superblock_security_struct *sbsec = sb->s_security; |
| 396 | struct dentry *root = sb->s_root; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 397 | struct inode *root_inode = root->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | int rc = 0; |
| 399 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | if (sbsec->behavior == SECURITY_FS_USE_XATTR) { |
| 401 | /* Make sure that the xattr handler exists and that no |
| 402 | error other than -ENODATA is returned by getxattr on |
| 403 | the root directory. -ENODATA is ok, as this may be |
| 404 | the first boot of the SELinux kernel before we have |
| 405 | assigned xattr values to the filesystem. */ |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 406 | if (!root_inode->i_op->getxattr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | printk(KERN_WARNING "SELinux: (dev %s, type %s) has no " |
| 408 | "xattr support\n", sb->s_id, sb->s_type->name); |
| 409 | rc = -EOPNOTSUPP; |
| 410 | goto out; |
| 411 | } |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 412 | rc = root_inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | if (rc < 0 && rc != -ENODATA) { |
| 414 | if (rc == -EOPNOTSUPP) |
| 415 | printk(KERN_WARNING "SELinux: (dev %s, type " |
| 416 | "%s) has no security xattr handler\n", |
| 417 | sb->s_id, sb->s_type->name); |
| 418 | else |
| 419 | printk(KERN_WARNING "SELinux: (dev %s, type " |
| 420 | "%s) getxattr errno %d\n", sb->s_id, |
| 421 | sb->s_type->name, -rc); |
| 422 | goto out; |
| 423 | } |
| 424 | } |
| 425 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | sbsec->initialized = 1; |
| 427 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 428 | if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors)) |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 429 | printk(KERN_ERR "SELinux: initialized (dev %s, type %s), unknown behavior\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | sb->s_id, sb->s_type->name); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 431 | else |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 432 | printk(KERN_DEBUG "SELinux: initialized (dev %s, type %s), %s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | sb->s_id, sb->s_type->name, |
| 434 | labeling_behaviors[sbsec->behavior-1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | |
| 436 | /* Initialize the root inode. */ |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 437 | rc = inode_doinit_with_dentry(root_inode, root); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | |
| 439 | /* Initialize any other inodes associated with the superblock, e.g. |
| 440 | inodes created prior to initial policy load or inodes created |
| 441 | during get_sb by a pseudo filesystem that directly |
| 442 | populates itself. */ |
| 443 | spin_lock(&sbsec->isec_lock); |
| 444 | next_inode: |
| 445 | if (!list_empty(&sbsec->isec_head)) { |
| 446 | struct inode_security_struct *isec = |
| 447 | list_entry(sbsec->isec_head.next, |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 448 | struct inode_security_struct, list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | struct inode *inode = isec->inode; |
| 450 | spin_unlock(&sbsec->isec_lock); |
| 451 | inode = igrab(inode); |
| 452 | if (inode) { |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 453 | if (!IS_PRIVATE(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | inode_doinit(inode); |
| 455 | iput(inode); |
| 456 | } |
| 457 | spin_lock(&sbsec->isec_lock); |
| 458 | list_del_init(&isec->list); |
| 459 | goto next_inode; |
| 460 | } |
| 461 | spin_unlock(&sbsec->isec_lock); |
| 462 | out: |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 463 | return rc; |
| 464 | } |
| 465 | |
| 466 | /* |
| 467 | * This function should allow an FS to ask what it's mount security |
| 468 | * options were so it can use those later for submounts, displaying |
| 469 | * mount options, or whatever. |
| 470 | */ |
| 471 | static int selinux_get_mnt_opts(const struct super_block *sb, |
| 472 | char ***mount_options, int **mnt_opts_flags, |
| 473 | int *num_opts) |
| 474 | { |
| 475 | int rc = 0, i; |
| 476 | struct superblock_security_struct *sbsec = sb->s_security; |
| 477 | char *context = NULL; |
| 478 | u32 len; |
| 479 | char tmp; |
| 480 | |
| 481 | *num_opts = 0; |
| 482 | *mount_options = NULL; |
| 483 | *mnt_opts_flags = NULL; |
| 484 | |
| 485 | if (!sbsec->initialized) |
| 486 | return -EINVAL; |
| 487 | |
| 488 | if (!ss_initialized) |
| 489 | return -EINVAL; |
| 490 | |
| 491 | /* |
| 492 | * if we ever use sbsec flags for anything other than tracking mount |
| 493 | * settings this is going to need a mask |
| 494 | */ |
| 495 | tmp = sbsec->flags; |
| 496 | /* count the number of mount options for this sb */ |
| 497 | for (i = 0; i < 8; i++) { |
| 498 | if (tmp & 0x01) |
| 499 | (*num_opts)++; |
| 500 | tmp >>= 1; |
| 501 | } |
| 502 | |
| 503 | *mount_options = kcalloc(*num_opts, sizeof(char *), GFP_ATOMIC); |
| 504 | if (!*mount_options) { |
| 505 | rc = -ENOMEM; |
| 506 | goto out_free; |
| 507 | } |
| 508 | |
| 509 | *mnt_opts_flags = kcalloc(*num_opts, sizeof(int), GFP_ATOMIC); |
| 510 | if (!*mnt_opts_flags) { |
| 511 | rc = -ENOMEM; |
| 512 | goto out_free; |
| 513 | } |
| 514 | |
| 515 | i = 0; |
| 516 | if (sbsec->flags & FSCONTEXT_MNT) { |
| 517 | rc = security_sid_to_context(sbsec->sid, &context, &len); |
| 518 | if (rc) |
| 519 | goto out_free; |
| 520 | (*mount_options)[i] = context; |
| 521 | (*mnt_opts_flags)[i++] = FSCONTEXT_MNT; |
| 522 | } |
| 523 | if (sbsec->flags & CONTEXT_MNT) { |
| 524 | rc = security_sid_to_context(sbsec->mntpoint_sid, &context, &len); |
| 525 | if (rc) |
| 526 | goto out_free; |
| 527 | (*mount_options)[i] = context; |
| 528 | (*mnt_opts_flags)[i++] = CONTEXT_MNT; |
| 529 | } |
| 530 | if (sbsec->flags & DEFCONTEXT_MNT) { |
| 531 | rc = security_sid_to_context(sbsec->def_sid, &context, &len); |
| 532 | if (rc) |
| 533 | goto out_free; |
| 534 | (*mount_options)[i] = context; |
| 535 | (*mnt_opts_flags)[i++] = DEFCONTEXT_MNT; |
| 536 | } |
| 537 | if (sbsec->flags & ROOTCONTEXT_MNT) { |
| 538 | struct inode *root = sbsec->sb->s_root->d_inode; |
| 539 | struct inode_security_struct *isec = root->i_security; |
| 540 | |
| 541 | rc = security_sid_to_context(isec->sid, &context, &len); |
| 542 | if (rc) |
| 543 | goto out_free; |
| 544 | (*mount_options)[i] = context; |
| 545 | (*mnt_opts_flags)[i++] = ROOTCONTEXT_MNT; |
| 546 | } |
| 547 | |
| 548 | BUG_ON(i != *num_opts); |
| 549 | |
| 550 | return 0; |
| 551 | |
| 552 | out_free: |
| 553 | /* don't leak context string if security_sid_to_context had an error */ |
| 554 | if (*mount_options && i) |
| 555 | for (; i > 0; i--) |
| 556 | kfree((*mount_options)[i-1]); |
| 557 | kfree(*mount_options); |
| 558 | *mount_options = NULL; |
| 559 | kfree(*mnt_opts_flags); |
| 560 | *mnt_opts_flags = NULL; |
| 561 | *num_opts = 0; |
| 562 | return rc; |
| 563 | } |
| 564 | |
| 565 | static int bad_option(struct superblock_security_struct *sbsec, char flag, |
| 566 | u32 old_sid, u32 new_sid) |
| 567 | { |
| 568 | /* check if the old mount command had the same options */ |
| 569 | if (sbsec->initialized) |
| 570 | if (!(sbsec->flags & flag) || |
| 571 | (old_sid != new_sid)) |
| 572 | return 1; |
| 573 | |
| 574 | /* check if we were passed the same options twice, |
| 575 | * aka someone passed context=a,context=b |
| 576 | */ |
| 577 | if (!sbsec->initialized) |
| 578 | if (sbsec->flags & flag) |
| 579 | return 1; |
| 580 | return 0; |
| 581 | } |
| 582 | /* |
| 583 | * Allow filesystems with binary mount data to explicitly set mount point |
| 584 | * labeling information. |
| 585 | */ |
Adrian Bunk | 374ea01 | 2008-01-29 00:11:52 +0200 | [diff] [blame] | 586 | static int selinux_set_mnt_opts(struct super_block *sb, char **mount_options, |
| 587 | int *flags, int num_opts) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 588 | { |
| 589 | int rc = 0, i; |
| 590 | struct task_security_struct *tsec = current->security; |
| 591 | struct superblock_security_struct *sbsec = sb->s_security; |
| 592 | const char *name = sb->s_type->name; |
| 593 | struct inode *inode = sbsec->sb->s_root->d_inode; |
| 594 | struct inode_security_struct *root_isec = inode->i_security; |
| 595 | u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0; |
| 596 | u32 defcontext_sid = 0; |
| 597 | |
| 598 | mutex_lock(&sbsec->lock); |
| 599 | |
| 600 | if (!ss_initialized) { |
| 601 | if (!num_opts) { |
| 602 | /* Defer initialization until selinux_complete_init, |
| 603 | after the initial policy is loaded and the security |
| 604 | server is ready to handle calls. */ |
| 605 | spin_lock(&sb_security_lock); |
| 606 | if (list_empty(&sbsec->list)) |
| 607 | list_add(&sbsec->list, &superblock_security_head); |
| 608 | spin_unlock(&sb_security_lock); |
| 609 | goto out; |
| 610 | } |
| 611 | rc = -EINVAL; |
| 612 | printk(KERN_WARNING "Unable to set superblock options before " |
| 613 | "the security server is initialized\n"); |
| 614 | goto out; |
| 615 | } |
| 616 | |
| 617 | /* |
| 618 | * parse the mount options, check if they are valid sids. |
| 619 | * also check if someone is trying to mount the same sb more |
| 620 | * than once with different security options. |
| 621 | */ |
| 622 | for (i = 0; i < num_opts; i++) { |
| 623 | u32 sid; |
| 624 | rc = security_context_to_sid(mount_options[i], |
| 625 | strlen(mount_options[i]), &sid); |
| 626 | if (rc) { |
| 627 | printk(KERN_WARNING "SELinux: security_context_to_sid" |
| 628 | "(%s) failed for (dev %s, type %s) errno=%d\n", |
| 629 | mount_options[i], sb->s_id, name, rc); |
| 630 | goto out; |
| 631 | } |
| 632 | switch (flags[i]) { |
| 633 | case FSCONTEXT_MNT: |
| 634 | fscontext_sid = sid; |
| 635 | |
| 636 | if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, |
| 637 | fscontext_sid)) |
| 638 | goto out_double_mount; |
| 639 | |
| 640 | sbsec->flags |= FSCONTEXT_MNT; |
| 641 | break; |
| 642 | case CONTEXT_MNT: |
| 643 | context_sid = sid; |
| 644 | |
| 645 | if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, |
| 646 | context_sid)) |
| 647 | goto out_double_mount; |
| 648 | |
| 649 | sbsec->flags |= CONTEXT_MNT; |
| 650 | break; |
| 651 | case ROOTCONTEXT_MNT: |
| 652 | rootcontext_sid = sid; |
| 653 | |
| 654 | if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, |
| 655 | rootcontext_sid)) |
| 656 | goto out_double_mount; |
| 657 | |
| 658 | sbsec->flags |= ROOTCONTEXT_MNT; |
| 659 | |
| 660 | break; |
| 661 | case DEFCONTEXT_MNT: |
| 662 | defcontext_sid = sid; |
| 663 | |
| 664 | if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, |
| 665 | defcontext_sid)) |
| 666 | goto out_double_mount; |
| 667 | |
| 668 | sbsec->flags |= DEFCONTEXT_MNT; |
| 669 | |
| 670 | break; |
| 671 | default: |
| 672 | rc = -EINVAL; |
| 673 | goto out; |
| 674 | } |
| 675 | } |
| 676 | |
| 677 | if (sbsec->initialized) { |
| 678 | /* previously mounted with options, but not on this attempt? */ |
| 679 | if (sbsec->flags && !num_opts) |
| 680 | goto out_double_mount; |
| 681 | rc = 0; |
| 682 | goto out; |
| 683 | } |
| 684 | |
| 685 | if (strcmp(sb->s_type->name, "proc") == 0) |
| 686 | sbsec->proc = 1; |
| 687 | |
| 688 | /* Determine the labeling behavior to use for this filesystem type. */ |
| 689 | rc = security_fs_use(sb->s_type->name, &sbsec->behavior, &sbsec->sid); |
| 690 | if (rc) { |
| 691 | printk(KERN_WARNING "%s: security_fs_use(%s) returned %d\n", |
| 692 | __FUNCTION__, sb->s_type->name, rc); |
| 693 | goto out; |
| 694 | } |
| 695 | |
| 696 | /* sets the context of the superblock for the fs being mounted. */ |
| 697 | if (fscontext_sid) { |
| 698 | |
| 699 | rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, tsec); |
| 700 | if (rc) |
| 701 | goto out; |
| 702 | |
| 703 | sbsec->sid = fscontext_sid; |
| 704 | } |
| 705 | |
| 706 | /* |
| 707 | * Switch to using mount point labeling behavior. |
| 708 | * sets the label used on all file below the mountpoint, and will set |
| 709 | * the superblock context if not already set. |
| 710 | */ |
| 711 | if (context_sid) { |
| 712 | if (!fscontext_sid) { |
| 713 | rc = may_context_mount_sb_relabel(context_sid, sbsec, tsec); |
| 714 | if (rc) |
| 715 | goto out; |
| 716 | sbsec->sid = context_sid; |
| 717 | } else { |
| 718 | rc = may_context_mount_inode_relabel(context_sid, sbsec, tsec); |
| 719 | if (rc) |
| 720 | goto out; |
| 721 | } |
| 722 | if (!rootcontext_sid) |
| 723 | rootcontext_sid = context_sid; |
| 724 | |
| 725 | sbsec->mntpoint_sid = context_sid; |
| 726 | sbsec->behavior = SECURITY_FS_USE_MNTPOINT; |
| 727 | } |
| 728 | |
| 729 | if (rootcontext_sid) { |
| 730 | rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec, tsec); |
| 731 | if (rc) |
| 732 | goto out; |
| 733 | |
| 734 | root_isec->sid = rootcontext_sid; |
| 735 | root_isec->initialized = 1; |
| 736 | } |
| 737 | |
| 738 | if (defcontext_sid) { |
| 739 | if (sbsec->behavior != SECURITY_FS_USE_XATTR) { |
| 740 | rc = -EINVAL; |
| 741 | printk(KERN_WARNING "SELinux: defcontext option is " |
| 742 | "invalid for this filesystem type\n"); |
| 743 | goto out; |
| 744 | } |
| 745 | |
| 746 | if (defcontext_sid != sbsec->def_sid) { |
| 747 | rc = may_context_mount_inode_relabel(defcontext_sid, |
| 748 | sbsec, tsec); |
| 749 | if (rc) |
| 750 | goto out; |
| 751 | } |
| 752 | |
| 753 | sbsec->def_sid = defcontext_sid; |
| 754 | } |
| 755 | |
| 756 | rc = sb_finish_set_opts(sb); |
| 757 | out: |
Eric Paris | bc7e982 | 2006-09-25 23:32:02 -0700 | [diff] [blame] | 758 | mutex_unlock(&sbsec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | return rc; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 760 | out_double_mount: |
| 761 | rc = -EINVAL; |
| 762 | printk(KERN_WARNING "SELinux: mount invalid. Same superblock, different " |
| 763 | "security settings for (dev %s, type %s)\n", sb->s_id, name); |
| 764 | goto out; |
| 765 | } |
| 766 | |
| 767 | static void selinux_sb_clone_mnt_opts(const struct super_block *oldsb, |
| 768 | struct super_block *newsb) |
| 769 | { |
| 770 | const struct superblock_security_struct *oldsbsec = oldsb->s_security; |
| 771 | struct superblock_security_struct *newsbsec = newsb->s_security; |
| 772 | |
| 773 | int set_fscontext = (oldsbsec->flags & FSCONTEXT_MNT); |
| 774 | int set_context = (oldsbsec->flags & CONTEXT_MNT); |
| 775 | int set_rootcontext = (oldsbsec->flags & ROOTCONTEXT_MNT); |
| 776 | |
| 777 | /* we can't error, we can't save the info, this shouldn't get called |
| 778 | * this early in the boot process. */ |
| 779 | BUG_ON(!ss_initialized); |
| 780 | |
| 781 | /* this might go away sometime down the line if there is a new user |
| 782 | * of clone, but for now, nfs better not get here... */ |
| 783 | BUG_ON(newsbsec->initialized); |
| 784 | |
| 785 | /* how can we clone if the old one wasn't set up?? */ |
| 786 | BUG_ON(!oldsbsec->initialized); |
| 787 | |
| 788 | mutex_lock(&newsbsec->lock); |
| 789 | |
| 790 | newsbsec->flags = oldsbsec->flags; |
| 791 | |
| 792 | newsbsec->sid = oldsbsec->sid; |
| 793 | newsbsec->def_sid = oldsbsec->def_sid; |
| 794 | newsbsec->behavior = oldsbsec->behavior; |
| 795 | |
| 796 | if (set_context) { |
| 797 | u32 sid = oldsbsec->mntpoint_sid; |
| 798 | |
| 799 | if (!set_fscontext) |
| 800 | newsbsec->sid = sid; |
| 801 | if (!set_rootcontext) { |
| 802 | struct inode *newinode = newsb->s_root->d_inode; |
| 803 | struct inode_security_struct *newisec = newinode->i_security; |
| 804 | newisec->sid = sid; |
| 805 | } |
| 806 | newsbsec->mntpoint_sid = sid; |
| 807 | } |
| 808 | if (set_rootcontext) { |
| 809 | const struct inode *oldinode = oldsb->s_root->d_inode; |
| 810 | const struct inode_security_struct *oldisec = oldinode->i_security; |
| 811 | struct inode *newinode = newsb->s_root->d_inode; |
| 812 | struct inode_security_struct *newisec = newinode->i_security; |
| 813 | |
| 814 | newisec->sid = oldisec->sid; |
| 815 | } |
| 816 | |
| 817 | sb_finish_set_opts(newsb); |
| 818 | mutex_unlock(&newsbsec->lock); |
| 819 | } |
| 820 | |
| 821 | /* |
| 822 | * string mount options parsing and call set the sbsec |
| 823 | */ |
| 824 | static int superblock_doinit(struct super_block *sb, void *data) |
| 825 | { |
| 826 | char *context = NULL, *defcontext = NULL; |
| 827 | char *fscontext = NULL, *rootcontext = NULL; |
| 828 | int rc = 0; |
| 829 | char *p, *options = data; |
| 830 | /* selinux only know about a fixed number of mount options */ |
| 831 | char *mnt_opts[NUM_SEL_MNT_OPTS]; |
| 832 | int mnt_opts_flags[NUM_SEL_MNT_OPTS], num_mnt_opts = 0; |
| 833 | |
| 834 | if (!data) |
| 835 | goto out; |
| 836 | |
| 837 | /* with the nfs patch this will become a goto out; */ |
| 838 | if (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) { |
| 839 | const char *name = sb->s_type->name; |
| 840 | /* NFS we understand. */ |
| 841 | if (!strcmp(name, "nfs")) { |
| 842 | struct nfs_mount_data *d = data; |
| 843 | |
| 844 | if (d->version != NFS_MOUNT_VERSION) |
| 845 | goto out; |
| 846 | |
| 847 | if (d->context[0]) { |
| 848 | context = kstrdup(d->context, GFP_KERNEL); |
| 849 | if (!context) { |
| 850 | rc = -ENOMEM; |
| 851 | goto out; |
| 852 | } |
| 853 | } |
| 854 | goto build_flags; |
| 855 | } else |
| 856 | goto out; |
| 857 | } |
| 858 | |
| 859 | /* Standard string-based options. */ |
| 860 | while ((p = strsep(&options, "|")) != NULL) { |
| 861 | int token; |
| 862 | substring_t args[MAX_OPT_ARGS]; |
| 863 | |
| 864 | if (!*p) |
| 865 | continue; |
| 866 | |
| 867 | token = match_token(p, tokens, args); |
| 868 | |
| 869 | switch (token) { |
| 870 | case Opt_context: |
| 871 | if (context || defcontext) { |
| 872 | rc = -EINVAL; |
| 873 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 874 | goto out_err; |
| 875 | } |
| 876 | context = match_strdup(&args[0]); |
| 877 | if (!context) { |
| 878 | rc = -ENOMEM; |
| 879 | goto out_err; |
| 880 | } |
| 881 | break; |
| 882 | |
| 883 | case Opt_fscontext: |
| 884 | if (fscontext) { |
| 885 | rc = -EINVAL; |
| 886 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 887 | goto out_err; |
| 888 | } |
| 889 | fscontext = match_strdup(&args[0]); |
| 890 | if (!fscontext) { |
| 891 | rc = -ENOMEM; |
| 892 | goto out_err; |
| 893 | } |
| 894 | break; |
| 895 | |
| 896 | case Opt_rootcontext: |
| 897 | if (rootcontext) { |
| 898 | rc = -EINVAL; |
| 899 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 900 | goto out_err; |
| 901 | } |
| 902 | rootcontext = match_strdup(&args[0]); |
| 903 | if (!rootcontext) { |
| 904 | rc = -ENOMEM; |
| 905 | goto out_err; |
| 906 | } |
| 907 | break; |
| 908 | |
| 909 | case Opt_defcontext: |
| 910 | if (context || defcontext) { |
| 911 | rc = -EINVAL; |
| 912 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 913 | goto out_err; |
| 914 | } |
| 915 | defcontext = match_strdup(&args[0]); |
| 916 | if (!defcontext) { |
| 917 | rc = -ENOMEM; |
| 918 | goto out_err; |
| 919 | } |
| 920 | break; |
| 921 | |
| 922 | default: |
| 923 | rc = -EINVAL; |
| 924 | printk(KERN_WARNING "SELinux: unknown mount option\n"); |
| 925 | goto out_err; |
| 926 | |
| 927 | } |
| 928 | } |
| 929 | |
| 930 | build_flags: |
| 931 | if (fscontext) { |
| 932 | mnt_opts[num_mnt_opts] = fscontext; |
| 933 | mnt_opts_flags[num_mnt_opts++] = FSCONTEXT_MNT; |
| 934 | } |
| 935 | if (context) { |
| 936 | mnt_opts[num_mnt_opts] = context; |
| 937 | mnt_opts_flags[num_mnt_opts++] = CONTEXT_MNT; |
| 938 | } |
| 939 | if (rootcontext) { |
| 940 | mnt_opts[num_mnt_opts] = rootcontext; |
| 941 | mnt_opts_flags[num_mnt_opts++] = ROOTCONTEXT_MNT; |
| 942 | } |
| 943 | if (defcontext) { |
| 944 | mnt_opts[num_mnt_opts] = defcontext; |
| 945 | mnt_opts_flags[num_mnt_opts++] = DEFCONTEXT_MNT; |
| 946 | } |
| 947 | |
| 948 | out: |
| 949 | rc = selinux_set_mnt_opts(sb, mnt_opts, mnt_opts_flags, num_mnt_opts); |
| 950 | out_err: |
| 951 | kfree(context); |
| 952 | kfree(defcontext); |
| 953 | kfree(fscontext); |
| 954 | kfree(rootcontext); |
| 955 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | } |
| 957 | |
| 958 | static inline u16 inode_mode_to_security_class(umode_t mode) |
| 959 | { |
| 960 | switch (mode & S_IFMT) { |
| 961 | case S_IFSOCK: |
| 962 | return SECCLASS_SOCK_FILE; |
| 963 | case S_IFLNK: |
| 964 | return SECCLASS_LNK_FILE; |
| 965 | case S_IFREG: |
| 966 | return SECCLASS_FILE; |
| 967 | case S_IFBLK: |
| 968 | return SECCLASS_BLK_FILE; |
| 969 | case S_IFDIR: |
| 970 | return SECCLASS_DIR; |
| 971 | case S_IFCHR: |
| 972 | return SECCLASS_CHR_FILE; |
| 973 | case S_IFIFO: |
| 974 | return SECCLASS_FIFO_FILE; |
| 975 | |
| 976 | } |
| 977 | |
| 978 | return SECCLASS_FILE; |
| 979 | } |
| 980 | |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 981 | static inline int default_protocol_stream(int protocol) |
| 982 | { |
| 983 | return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP); |
| 984 | } |
| 985 | |
| 986 | static inline int default_protocol_dgram(int protocol) |
| 987 | { |
| 988 | return (protocol == IPPROTO_IP || protocol == IPPROTO_UDP); |
| 989 | } |
| 990 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | static inline u16 socket_type_to_security_class(int family, int type, int protocol) |
| 992 | { |
| 993 | switch (family) { |
| 994 | case PF_UNIX: |
| 995 | switch (type) { |
| 996 | case SOCK_STREAM: |
| 997 | case SOCK_SEQPACKET: |
| 998 | return SECCLASS_UNIX_STREAM_SOCKET; |
| 999 | case SOCK_DGRAM: |
| 1000 | return SECCLASS_UNIX_DGRAM_SOCKET; |
| 1001 | } |
| 1002 | break; |
| 1003 | case PF_INET: |
| 1004 | case PF_INET6: |
| 1005 | switch (type) { |
| 1006 | case SOCK_STREAM: |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 1007 | if (default_protocol_stream(protocol)) |
| 1008 | return SECCLASS_TCP_SOCKET; |
| 1009 | else |
| 1010 | return SECCLASS_RAWIP_SOCKET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | case SOCK_DGRAM: |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 1012 | if (default_protocol_dgram(protocol)) |
| 1013 | return SECCLASS_UDP_SOCKET; |
| 1014 | else |
| 1015 | return SECCLASS_RAWIP_SOCKET; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 1016 | case SOCK_DCCP: |
| 1017 | return SECCLASS_DCCP_SOCKET; |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 1018 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | return SECCLASS_RAWIP_SOCKET; |
| 1020 | } |
| 1021 | break; |
| 1022 | case PF_NETLINK: |
| 1023 | switch (protocol) { |
| 1024 | case NETLINK_ROUTE: |
| 1025 | return SECCLASS_NETLINK_ROUTE_SOCKET; |
| 1026 | case NETLINK_FIREWALL: |
| 1027 | return SECCLASS_NETLINK_FIREWALL_SOCKET; |
James Morris | 216efaa | 2005-08-15 20:34:48 -0700 | [diff] [blame] | 1028 | case NETLINK_INET_DIAG: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | return SECCLASS_NETLINK_TCPDIAG_SOCKET; |
| 1030 | case NETLINK_NFLOG: |
| 1031 | return SECCLASS_NETLINK_NFLOG_SOCKET; |
| 1032 | case NETLINK_XFRM: |
| 1033 | return SECCLASS_NETLINK_XFRM_SOCKET; |
| 1034 | case NETLINK_SELINUX: |
| 1035 | return SECCLASS_NETLINK_SELINUX_SOCKET; |
| 1036 | case NETLINK_AUDIT: |
| 1037 | return SECCLASS_NETLINK_AUDIT_SOCKET; |
| 1038 | case NETLINK_IP6_FW: |
| 1039 | return SECCLASS_NETLINK_IP6FW_SOCKET; |
| 1040 | case NETLINK_DNRTMSG: |
| 1041 | return SECCLASS_NETLINK_DNRT_SOCKET; |
James Morris | 0c9b794 | 2005-04-16 15:24:13 -0700 | [diff] [blame] | 1042 | case NETLINK_KOBJECT_UEVENT: |
| 1043 | return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | default: |
| 1045 | return SECCLASS_NETLINK_SOCKET; |
| 1046 | } |
| 1047 | case PF_PACKET: |
| 1048 | return SECCLASS_PACKET_SOCKET; |
| 1049 | case PF_KEY: |
| 1050 | return SECCLASS_KEY_SOCKET; |
Christopher J. PeBenito | 3e3ff15 | 2006-06-09 00:25:03 -0700 | [diff] [blame] | 1051 | case PF_APPLETALK: |
| 1052 | return SECCLASS_APPLETALK_SOCKET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | } |
| 1054 | |
| 1055 | return SECCLASS_SOCKET; |
| 1056 | } |
| 1057 | |
| 1058 | #ifdef CONFIG_PROC_FS |
| 1059 | static int selinux_proc_get_sid(struct proc_dir_entry *de, |
| 1060 | u16 tclass, |
| 1061 | u32 *sid) |
| 1062 | { |
| 1063 | int buflen, rc; |
| 1064 | char *buffer, *path, *end; |
| 1065 | |
| 1066 | buffer = (char*)__get_free_page(GFP_KERNEL); |
| 1067 | if (!buffer) |
| 1068 | return -ENOMEM; |
| 1069 | |
| 1070 | buflen = PAGE_SIZE; |
| 1071 | end = buffer+buflen; |
| 1072 | *--end = '\0'; |
| 1073 | buflen--; |
| 1074 | path = end-1; |
| 1075 | *path = '/'; |
| 1076 | while (de && de != de->parent) { |
| 1077 | buflen -= de->namelen + 1; |
| 1078 | if (buflen < 0) |
| 1079 | break; |
| 1080 | end -= de->namelen; |
| 1081 | memcpy(end, de->name, de->namelen); |
| 1082 | *--end = '/'; |
| 1083 | path = end; |
| 1084 | de = de->parent; |
| 1085 | } |
| 1086 | rc = security_genfs_sid("proc", path, tclass, sid); |
| 1087 | free_page((unsigned long)buffer); |
| 1088 | return rc; |
| 1089 | } |
| 1090 | #else |
| 1091 | static int selinux_proc_get_sid(struct proc_dir_entry *de, |
| 1092 | u16 tclass, |
| 1093 | u32 *sid) |
| 1094 | { |
| 1095 | return -EINVAL; |
| 1096 | } |
| 1097 | #endif |
| 1098 | |
| 1099 | /* The inode's security attributes must be initialized before first use. */ |
| 1100 | static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry) |
| 1101 | { |
| 1102 | struct superblock_security_struct *sbsec = NULL; |
| 1103 | struct inode_security_struct *isec = inode->i_security; |
| 1104 | u32 sid; |
| 1105 | struct dentry *dentry; |
| 1106 | #define INITCONTEXTLEN 255 |
| 1107 | char *context = NULL; |
| 1108 | unsigned len = 0; |
| 1109 | int rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | |
| 1111 | if (isec->initialized) |
| 1112 | goto out; |
| 1113 | |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1114 | mutex_lock(&isec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1115 | if (isec->initialized) |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1116 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | |
| 1118 | sbsec = inode->i_sb->s_security; |
| 1119 | if (!sbsec->initialized) { |
| 1120 | /* Defer initialization until selinux_complete_init, |
| 1121 | after the initial policy is loaded and the security |
| 1122 | server is ready to handle calls. */ |
| 1123 | spin_lock(&sbsec->isec_lock); |
| 1124 | if (list_empty(&isec->list)) |
| 1125 | list_add(&isec->list, &sbsec->isec_head); |
| 1126 | spin_unlock(&sbsec->isec_lock); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1127 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | } |
| 1129 | |
| 1130 | switch (sbsec->behavior) { |
| 1131 | case SECURITY_FS_USE_XATTR: |
| 1132 | if (!inode->i_op->getxattr) { |
| 1133 | isec->sid = sbsec->def_sid; |
| 1134 | break; |
| 1135 | } |
| 1136 | |
| 1137 | /* Need a dentry, since the xattr API requires one. |
| 1138 | Life would be simpler if we could just pass the inode. */ |
| 1139 | if (opt_dentry) { |
| 1140 | /* Called from d_instantiate or d_splice_alias. */ |
| 1141 | dentry = dget(opt_dentry); |
| 1142 | } else { |
| 1143 | /* Called from selinux_complete_init, try to find a dentry. */ |
| 1144 | dentry = d_find_alias(inode); |
| 1145 | } |
| 1146 | if (!dentry) { |
| 1147 | printk(KERN_WARNING "%s: no dentry for dev=%s " |
| 1148 | "ino=%ld\n", __FUNCTION__, inode->i_sb->s_id, |
| 1149 | inode->i_ino); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1150 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | } |
| 1152 | |
| 1153 | len = INITCONTEXTLEN; |
| 1154 | context = kmalloc(len, GFP_KERNEL); |
| 1155 | if (!context) { |
| 1156 | rc = -ENOMEM; |
| 1157 | dput(dentry); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1158 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1159 | } |
| 1160 | rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, |
| 1161 | context, len); |
| 1162 | if (rc == -ERANGE) { |
| 1163 | /* Need a larger buffer. Query for the right size. */ |
| 1164 | rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, |
| 1165 | NULL, 0); |
| 1166 | if (rc < 0) { |
| 1167 | dput(dentry); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1168 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | } |
| 1170 | kfree(context); |
| 1171 | len = rc; |
| 1172 | context = kmalloc(len, GFP_KERNEL); |
| 1173 | if (!context) { |
| 1174 | rc = -ENOMEM; |
| 1175 | dput(dentry); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1176 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | } |
| 1178 | rc = inode->i_op->getxattr(dentry, |
| 1179 | XATTR_NAME_SELINUX, |
| 1180 | context, len); |
| 1181 | } |
| 1182 | dput(dentry); |
| 1183 | if (rc < 0) { |
| 1184 | if (rc != -ENODATA) { |
| 1185 | printk(KERN_WARNING "%s: getxattr returned " |
| 1186 | "%d for dev=%s ino=%ld\n", __FUNCTION__, |
| 1187 | -rc, inode->i_sb->s_id, inode->i_ino); |
| 1188 | kfree(context); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1189 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1190 | } |
| 1191 | /* Map ENODATA to the default file SID */ |
| 1192 | sid = sbsec->def_sid; |
| 1193 | rc = 0; |
| 1194 | } else { |
James Morris | f5c1d5b | 2005-07-28 01:07:37 -0700 | [diff] [blame] | 1195 | rc = security_context_to_sid_default(context, rc, &sid, |
| 1196 | sbsec->def_sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | if (rc) { |
| 1198 | printk(KERN_WARNING "%s: context_to_sid(%s) " |
| 1199 | "returned %d for dev=%s ino=%ld\n", |
| 1200 | __FUNCTION__, context, -rc, |
| 1201 | inode->i_sb->s_id, inode->i_ino); |
| 1202 | kfree(context); |
| 1203 | /* Leave with the unlabeled SID */ |
| 1204 | rc = 0; |
| 1205 | break; |
| 1206 | } |
| 1207 | } |
| 1208 | kfree(context); |
| 1209 | isec->sid = sid; |
| 1210 | break; |
| 1211 | case SECURITY_FS_USE_TASK: |
| 1212 | isec->sid = isec->task_sid; |
| 1213 | break; |
| 1214 | case SECURITY_FS_USE_TRANS: |
| 1215 | /* Default to the fs SID. */ |
| 1216 | isec->sid = sbsec->sid; |
| 1217 | |
| 1218 | /* Try to obtain a transition SID. */ |
| 1219 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
| 1220 | rc = security_transition_sid(isec->task_sid, |
| 1221 | sbsec->sid, |
| 1222 | isec->sclass, |
| 1223 | &sid); |
| 1224 | if (rc) |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1225 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | isec->sid = sid; |
| 1227 | break; |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 1228 | case SECURITY_FS_USE_MNTPOINT: |
| 1229 | isec->sid = sbsec->mntpoint_sid; |
| 1230 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | default: |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 1232 | /* Default to the fs superblock SID. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1233 | isec->sid = sbsec->sid; |
| 1234 | |
| 1235 | if (sbsec->proc) { |
| 1236 | struct proc_inode *proci = PROC_I(inode); |
| 1237 | if (proci->pde) { |
| 1238 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
| 1239 | rc = selinux_proc_get_sid(proci->pde, |
| 1240 | isec->sclass, |
| 1241 | &sid); |
| 1242 | if (rc) |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1243 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1244 | isec->sid = sid; |
| 1245 | } |
| 1246 | } |
| 1247 | break; |
| 1248 | } |
| 1249 | |
| 1250 | isec->initialized = 1; |
| 1251 | |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1252 | out_unlock: |
| 1253 | mutex_unlock(&isec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | out: |
| 1255 | if (isec->sclass == SECCLASS_FILE) |
| 1256 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | return rc; |
| 1258 | } |
| 1259 | |
| 1260 | /* Convert a Linux signal to an access vector. */ |
| 1261 | static inline u32 signal_to_av(int sig) |
| 1262 | { |
| 1263 | u32 perm = 0; |
| 1264 | |
| 1265 | switch (sig) { |
| 1266 | case SIGCHLD: |
| 1267 | /* Commonly granted from child to parent. */ |
| 1268 | perm = PROCESS__SIGCHLD; |
| 1269 | break; |
| 1270 | case SIGKILL: |
| 1271 | /* Cannot be caught or ignored */ |
| 1272 | perm = PROCESS__SIGKILL; |
| 1273 | break; |
| 1274 | case SIGSTOP: |
| 1275 | /* Cannot be caught or ignored */ |
| 1276 | perm = PROCESS__SIGSTOP; |
| 1277 | break; |
| 1278 | default: |
| 1279 | /* All other signals. */ |
| 1280 | perm = PROCESS__SIGNAL; |
| 1281 | break; |
| 1282 | } |
| 1283 | |
| 1284 | return perm; |
| 1285 | } |
| 1286 | |
| 1287 | /* Check permission betweeen a pair of tasks, e.g. signal checks, |
| 1288 | fork check, ptrace check, etc. */ |
| 1289 | static int task_has_perm(struct task_struct *tsk1, |
| 1290 | struct task_struct *tsk2, |
| 1291 | u32 perms) |
| 1292 | { |
| 1293 | struct task_security_struct *tsec1, *tsec2; |
| 1294 | |
| 1295 | tsec1 = tsk1->security; |
| 1296 | tsec2 = tsk2->security; |
| 1297 | return avc_has_perm(tsec1->sid, tsec2->sid, |
| 1298 | SECCLASS_PROCESS, perms, NULL); |
| 1299 | } |
| 1300 | |
| 1301 | /* Check whether a task is allowed to use a capability. */ |
| 1302 | static int task_has_capability(struct task_struct *tsk, |
| 1303 | int cap) |
| 1304 | { |
| 1305 | struct task_security_struct *tsec; |
| 1306 | struct avc_audit_data ad; |
| 1307 | |
| 1308 | tsec = tsk->security; |
| 1309 | |
| 1310 | AVC_AUDIT_DATA_INIT(&ad,CAP); |
| 1311 | ad.tsk = tsk; |
| 1312 | ad.u.cap = cap; |
| 1313 | |
| 1314 | return avc_has_perm(tsec->sid, tsec->sid, |
| 1315 | SECCLASS_CAPABILITY, CAP_TO_MASK(cap), &ad); |
| 1316 | } |
| 1317 | |
| 1318 | /* Check whether a task is allowed to use a system operation. */ |
| 1319 | static int task_has_system(struct task_struct *tsk, |
| 1320 | u32 perms) |
| 1321 | { |
| 1322 | struct task_security_struct *tsec; |
| 1323 | |
| 1324 | tsec = tsk->security; |
| 1325 | |
| 1326 | return avc_has_perm(tsec->sid, SECINITSID_KERNEL, |
| 1327 | SECCLASS_SYSTEM, perms, NULL); |
| 1328 | } |
| 1329 | |
| 1330 | /* Check whether a task has a particular permission to an inode. |
| 1331 | The 'adp' parameter is optional and allows other audit |
| 1332 | data to be passed (e.g. the dentry). */ |
| 1333 | static int inode_has_perm(struct task_struct *tsk, |
| 1334 | struct inode *inode, |
| 1335 | u32 perms, |
| 1336 | struct avc_audit_data *adp) |
| 1337 | { |
| 1338 | struct task_security_struct *tsec; |
| 1339 | struct inode_security_struct *isec; |
| 1340 | struct avc_audit_data ad; |
| 1341 | |
Stephen Smalley | bbaca6c | 2007-02-14 00:34:16 -0800 | [diff] [blame] | 1342 | if (unlikely (IS_PRIVATE (inode))) |
| 1343 | return 0; |
| 1344 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1345 | tsec = tsk->security; |
| 1346 | isec = inode->i_security; |
| 1347 | |
| 1348 | if (!adp) { |
| 1349 | adp = &ad; |
| 1350 | AVC_AUDIT_DATA_INIT(&ad, FS); |
| 1351 | ad.u.fs.inode = inode; |
| 1352 | } |
| 1353 | |
| 1354 | return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, adp); |
| 1355 | } |
| 1356 | |
| 1357 | /* Same as inode_has_perm, but pass explicit audit data containing |
| 1358 | the dentry to help the auditing code to more easily generate the |
| 1359 | pathname if needed. */ |
| 1360 | static inline int dentry_has_perm(struct task_struct *tsk, |
| 1361 | struct vfsmount *mnt, |
| 1362 | struct dentry *dentry, |
| 1363 | u32 av) |
| 1364 | { |
| 1365 | struct inode *inode = dentry->d_inode; |
| 1366 | struct avc_audit_data ad; |
| 1367 | AVC_AUDIT_DATA_INIT(&ad,FS); |
| 1368 | ad.u.fs.mnt = mnt; |
| 1369 | ad.u.fs.dentry = dentry; |
| 1370 | return inode_has_perm(tsk, inode, av, &ad); |
| 1371 | } |
| 1372 | |
| 1373 | /* Check whether a task can use an open file descriptor to |
| 1374 | access an inode in a given way. Check access to the |
| 1375 | descriptor itself, and then use dentry_has_perm to |
| 1376 | check a particular permission to the file. |
| 1377 | Access to the descriptor is implicitly granted if it |
| 1378 | has the same SID as the process. If av is zero, then |
| 1379 | access to the file is not checked, e.g. for cases |
| 1380 | where only the descriptor is affected like seek. */ |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 1381 | static int file_has_perm(struct task_struct *tsk, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | struct file *file, |
| 1383 | u32 av) |
| 1384 | { |
| 1385 | struct task_security_struct *tsec = tsk->security; |
| 1386 | struct file_security_struct *fsec = file->f_security; |
Josef Sipek | 3d5ff52 | 2006-12-08 02:37:38 -0800 | [diff] [blame] | 1387 | struct vfsmount *mnt = file->f_path.mnt; |
| 1388 | struct dentry *dentry = file->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | struct inode *inode = dentry->d_inode; |
| 1390 | struct avc_audit_data ad; |
| 1391 | int rc; |
| 1392 | |
| 1393 | AVC_AUDIT_DATA_INIT(&ad, FS); |
| 1394 | ad.u.fs.mnt = mnt; |
| 1395 | ad.u.fs.dentry = dentry; |
| 1396 | |
| 1397 | if (tsec->sid != fsec->sid) { |
| 1398 | rc = avc_has_perm(tsec->sid, fsec->sid, |
| 1399 | SECCLASS_FD, |
| 1400 | FD__USE, |
| 1401 | &ad); |
| 1402 | if (rc) |
| 1403 | return rc; |
| 1404 | } |
| 1405 | |
| 1406 | /* av is zero if only checking access to the descriptor. */ |
| 1407 | if (av) |
| 1408 | return inode_has_perm(tsk, inode, av, &ad); |
| 1409 | |
| 1410 | return 0; |
| 1411 | } |
| 1412 | |
| 1413 | /* Check whether a task can create a file. */ |
| 1414 | static int may_create(struct inode *dir, |
| 1415 | struct dentry *dentry, |
| 1416 | u16 tclass) |
| 1417 | { |
| 1418 | struct task_security_struct *tsec; |
| 1419 | struct inode_security_struct *dsec; |
| 1420 | struct superblock_security_struct *sbsec; |
| 1421 | u32 newsid; |
| 1422 | struct avc_audit_data ad; |
| 1423 | int rc; |
| 1424 | |
| 1425 | tsec = current->security; |
| 1426 | dsec = dir->i_security; |
| 1427 | sbsec = dir->i_sb->s_security; |
| 1428 | |
| 1429 | AVC_AUDIT_DATA_INIT(&ad, FS); |
| 1430 | ad.u.fs.dentry = dentry; |
| 1431 | |
| 1432 | rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR, |
| 1433 | DIR__ADD_NAME | DIR__SEARCH, |
| 1434 | &ad); |
| 1435 | if (rc) |
| 1436 | return rc; |
| 1437 | |
| 1438 | if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) { |
| 1439 | newsid = tsec->create_sid; |
| 1440 | } else { |
| 1441 | rc = security_transition_sid(tsec->sid, dsec->sid, tclass, |
| 1442 | &newsid); |
| 1443 | if (rc) |
| 1444 | return rc; |
| 1445 | } |
| 1446 | |
| 1447 | rc = avc_has_perm(tsec->sid, newsid, tclass, FILE__CREATE, &ad); |
| 1448 | if (rc) |
| 1449 | return rc; |
| 1450 | |
| 1451 | return avc_has_perm(newsid, sbsec->sid, |
| 1452 | SECCLASS_FILESYSTEM, |
| 1453 | FILESYSTEM__ASSOCIATE, &ad); |
| 1454 | } |
| 1455 | |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 1456 | /* Check whether a task can create a key. */ |
| 1457 | static int may_create_key(u32 ksid, |
| 1458 | struct task_struct *ctx) |
| 1459 | { |
| 1460 | struct task_security_struct *tsec; |
| 1461 | |
| 1462 | tsec = ctx->security; |
| 1463 | |
| 1464 | return avc_has_perm(tsec->sid, ksid, SECCLASS_KEY, KEY__CREATE, NULL); |
| 1465 | } |
| 1466 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1467 | #define MAY_LINK 0 |
| 1468 | #define MAY_UNLINK 1 |
| 1469 | #define MAY_RMDIR 2 |
| 1470 | |
| 1471 | /* Check whether a task can link, unlink, or rmdir a file/directory. */ |
| 1472 | static int may_link(struct inode *dir, |
| 1473 | struct dentry *dentry, |
| 1474 | int kind) |
| 1475 | |
| 1476 | { |
| 1477 | struct task_security_struct *tsec; |
| 1478 | struct inode_security_struct *dsec, *isec; |
| 1479 | struct avc_audit_data ad; |
| 1480 | u32 av; |
| 1481 | int rc; |
| 1482 | |
| 1483 | tsec = current->security; |
| 1484 | dsec = dir->i_security; |
| 1485 | isec = dentry->d_inode->i_security; |
| 1486 | |
| 1487 | AVC_AUDIT_DATA_INIT(&ad, FS); |
| 1488 | ad.u.fs.dentry = dentry; |
| 1489 | |
| 1490 | av = DIR__SEARCH; |
| 1491 | av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME); |
| 1492 | rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR, av, &ad); |
| 1493 | if (rc) |
| 1494 | return rc; |
| 1495 | |
| 1496 | switch (kind) { |
| 1497 | case MAY_LINK: |
| 1498 | av = FILE__LINK; |
| 1499 | break; |
| 1500 | case MAY_UNLINK: |
| 1501 | av = FILE__UNLINK; |
| 1502 | break; |
| 1503 | case MAY_RMDIR: |
| 1504 | av = DIR__RMDIR; |
| 1505 | break; |
| 1506 | default: |
| 1507 | printk(KERN_WARNING "may_link: unrecognized kind %d\n", kind); |
| 1508 | return 0; |
| 1509 | } |
| 1510 | |
| 1511 | rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass, av, &ad); |
| 1512 | return rc; |
| 1513 | } |
| 1514 | |
| 1515 | static inline int may_rename(struct inode *old_dir, |
| 1516 | struct dentry *old_dentry, |
| 1517 | struct inode *new_dir, |
| 1518 | struct dentry *new_dentry) |
| 1519 | { |
| 1520 | struct task_security_struct *tsec; |
| 1521 | struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec; |
| 1522 | struct avc_audit_data ad; |
| 1523 | u32 av; |
| 1524 | int old_is_dir, new_is_dir; |
| 1525 | int rc; |
| 1526 | |
| 1527 | tsec = current->security; |
| 1528 | old_dsec = old_dir->i_security; |
| 1529 | old_isec = old_dentry->d_inode->i_security; |
| 1530 | old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode); |
| 1531 | new_dsec = new_dir->i_security; |
| 1532 | |
| 1533 | AVC_AUDIT_DATA_INIT(&ad, FS); |
| 1534 | |
| 1535 | ad.u.fs.dentry = old_dentry; |
| 1536 | rc = avc_has_perm(tsec->sid, old_dsec->sid, SECCLASS_DIR, |
| 1537 | DIR__REMOVE_NAME | DIR__SEARCH, &ad); |
| 1538 | if (rc) |
| 1539 | return rc; |
| 1540 | rc = avc_has_perm(tsec->sid, old_isec->sid, |
| 1541 | old_isec->sclass, FILE__RENAME, &ad); |
| 1542 | if (rc) |
| 1543 | return rc; |
| 1544 | if (old_is_dir && new_dir != old_dir) { |
| 1545 | rc = avc_has_perm(tsec->sid, old_isec->sid, |
| 1546 | old_isec->sclass, DIR__REPARENT, &ad); |
| 1547 | if (rc) |
| 1548 | return rc; |
| 1549 | } |
| 1550 | |
| 1551 | ad.u.fs.dentry = new_dentry; |
| 1552 | av = DIR__ADD_NAME | DIR__SEARCH; |
| 1553 | if (new_dentry->d_inode) |
| 1554 | av |= DIR__REMOVE_NAME; |
| 1555 | rc = avc_has_perm(tsec->sid, new_dsec->sid, SECCLASS_DIR, av, &ad); |
| 1556 | if (rc) |
| 1557 | return rc; |
| 1558 | if (new_dentry->d_inode) { |
| 1559 | new_isec = new_dentry->d_inode->i_security; |
| 1560 | new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode); |
| 1561 | rc = avc_has_perm(tsec->sid, new_isec->sid, |
| 1562 | new_isec->sclass, |
| 1563 | (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad); |
| 1564 | if (rc) |
| 1565 | return rc; |
| 1566 | } |
| 1567 | |
| 1568 | return 0; |
| 1569 | } |
| 1570 | |
| 1571 | /* Check whether a task can perform a filesystem operation. */ |
| 1572 | static int superblock_has_perm(struct task_struct *tsk, |
| 1573 | struct super_block *sb, |
| 1574 | u32 perms, |
| 1575 | struct avc_audit_data *ad) |
| 1576 | { |
| 1577 | struct task_security_struct *tsec; |
| 1578 | struct superblock_security_struct *sbsec; |
| 1579 | |
| 1580 | tsec = tsk->security; |
| 1581 | sbsec = sb->s_security; |
| 1582 | return avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, |
| 1583 | perms, ad); |
| 1584 | } |
| 1585 | |
| 1586 | /* Convert a Linux mode and permission mask to an access vector. */ |
| 1587 | static inline u32 file_mask_to_av(int mode, int mask) |
| 1588 | { |
| 1589 | u32 av = 0; |
| 1590 | |
| 1591 | if ((mode & S_IFMT) != S_IFDIR) { |
| 1592 | if (mask & MAY_EXEC) |
| 1593 | av |= FILE__EXECUTE; |
| 1594 | if (mask & MAY_READ) |
| 1595 | av |= FILE__READ; |
| 1596 | |
| 1597 | if (mask & MAY_APPEND) |
| 1598 | av |= FILE__APPEND; |
| 1599 | else if (mask & MAY_WRITE) |
| 1600 | av |= FILE__WRITE; |
| 1601 | |
| 1602 | } else { |
| 1603 | if (mask & MAY_EXEC) |
| 1604 | av |= DIR__SEARCH; |
| 1605 | if (mask & MAY_WRITE) |
| 1606 | av |= DIR__WRITE; |
| 1607 | if (mask & MAY_READ) |
| 1608 | av |= DIR__READ; |
| 1609 | } |
| 1610 | |
| 1611 | return av; |
| 1612 | } |
| 1613 | |
| 1614 | /* Convert a Linux file to an access vector. */ |
| 1615 | static inline u32 file_to_av(struct file *file) |
| 1616 | { |
| 1617 | u32 av = 0; |
| 1618 | |
| 1619 | if (file->f_mode & FMODE_READ) |
| 1620 | av |= FILE__READ; |
| 1621 | if (file->f_mode & FMODE_WRITE) { |
| 1622 | if (file->f_flags & O_APPEND) |
| 1623 | av |= FILE__APPEND; |
| 1624 | else |
| 1625 | av |= FILE__WRITE; |
| 1626 | } |
| 1627 | |
| 1628 | return av; |
| 1629 | } |
| 1630 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1631 | /* Hook functions begin here. */ |
| 1632 | |
| 1633 | static int selinux_ptrace(struct task_struct *parent, struct task_struct *child) |
| 1634 | { |
| 1635 | struct task_security_struct *psec = parent->security; |
| 1636 | struct task_security_struct *csec = child->security; |
| 1637 | int rc; |
| 1638 | |
| 1639 | rc = secondary_ops->ptrace(parent,child); |
| 1640 | if (rc) |
| 1641 | return rc; |
| 1642 | |
| 1643 | rc = task_has_perm(parent, child, PROCESS__PTRACE); |
| 1644 | /* Save the SID of the tracing process for later use in apply_creds. */ |
Stephen Smalley | 341c2d8 | 2006-03-11 03:27:16 -0800 | [diff] [blame] | 1645 | if (!(child->ptrace & PT_PTRACED) && !rc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | csec->ptrace_sid = psec->sid; |
| 1647 | return rc; |
| 1648 | } |
| 1649 | |
| 1650 | static int selinux_capget(struct task_struct *target, kernel_cap_t *effective, |
| 1651 | kernel_cap_t *inheritable, kernel_cap_t *permitted) |
| 1652 | { |
| 1653 | int error; |
| 1654 | |
| 1655 | error = task_has_perm(current, target, PROCESS__GETCAP); |
| 1656 | if (error) |
| 1657 | return error; |
| 1658 | |
| 1659 | return secondary_ops->capget(target, effective, inheritable, permitted); |
| 1660 | } |
| 1661 | |
| 1662 | static int selinux_capset_check(struct task_struct *target, kernel_cap_t *effective, |
| 1663 | kernel_cap_t *inheritable, kernel_cap_t *permitted) |
| 1664 | { |
| 1665 | int error; |
| 1666 | |
| 1667 | error = secondary_ops->capset_check(target, effective, inheritable, permitted); |
| 1668 | if (error) |
| 1669 | return error; |
| 1670 | |
| 1671 | return task_has_perm(current, target, PROCESS__SETCAP); |
| 1672 | } |
| 1673 | |
| 1674 | static void selinux_capset_set(struct task_struct *target, kernel_cap_t *effective, |
| 1675 | kernel_cap_t *inheritable, kernel_cap_t *permitted) |
| 1676 | { |
| 1677 | secondary_ops->capset_set(target, effective, inheritable, permitted); |
| 1678 | } |
| 1679 | |
| 1680 | static int selinux_capable(struct task_struct *tsk, int cap) |
| 1681 | { |
| 1682 | int rc; |
| 1683 | |
| 1684 | rc = secondary_ops->capable(tsk, cap); |
| 1685 | if (rc) |
| 1686 | return rc; |
| 1687 | |
| 1688 | return task_has_capability(tsk,cap); |
| 1689 | } |
| 1690 | |
Eric W. Biederman | 3fbfa98 | 2007-02-14 00:34:14 -0800 | [diff] [blame] | 1691 | static int selinux_sysctl_get_sid(ctl_table *table, u16 tclass, u32 *sid) |
| 1692 | { |
| 1693 | int buflen, rc; |
| 1694 | char *buffer, *path, *end; |
| 1695 | |
| 1696 | rc = -ENOMEM; |
| 1697 | buffer = (char*)__get_free_page(GFP_KERNEL); |
| 1698 | if (!buffer) |
| 1699 | goto out; |
| 1700 | |
| 1701 | buflen = PAGE_SIZE; |
| 1702 | end = buffer+buflen; |
| 1703 | *--end = '\0'; |
| 1704 | buflen--; |
| 1705 | path = end-1; |
| 1706 | *path = '/'; |
| 1707 | while (table) { |
| 1708 | const char *name = table->procname; |
| 1709 | size_t namelen = strlen(name); |
| 1710 | buflen -= namelen + 1; |
| 1711 | if (buflen < 0) |
| 1712 | goto out_free; |
| 1713 | end -= namelen; |
| 1714 | memcpy(end, name, namelen); |
| 1715 | *--end = '/'; |
| 1716 | path = end; |
| 1717 | table = table->parent; |
| 1718 | } |
Eric W. Biederman | b599fdf | 2007-02-14 00:34:15 -0800 | [diff] [blame] | 1719 | buflen -= 4; |
| 1720 | if (buflen < 0) |
| 1721 | goto out_free; |
| 1722 | end -= 4; |
| 1723 | memcpy(end, "/sys", 4); |
| 1724 | path = end; |
Eric W. Biederman | 3fbfa98 | 2007-02-14 00:34:14 -0800 | [diff] [blame] | 1725 | rc = security_genfs_sid("proc", path, tclass, sid); |
| 1726 | out_free: |
| 1727 | free_page((unsigned long)buffer); |
| 1728 | out: |
| 1729 | return rc; |
| 1730 | } |
| 1731 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1732 | static int selinux_sysctl(ctl_table *table, int op) |
| 1733 | { |
| 1734 | int error = 0; |
| 1735 | u32 av; |
| 1736 | struct task_security_struct *tsec; |
| 1737 | u32 tsid; |
| 1738 | int rc; |
| 1739 | |
| 1740 | rc = secondary_ops->sysctl(table, op); |
| 1741 | if (rc) |
| 1742 | return rc; |
| 1743 | |
| 1744 | tsec = current->security; |
| 1745 | |
Eric W. Biederman | 3fbfa98 | 2007-02-14 00:34:14 -0800 | [diff] [blame] | 1746 | rc = selinux_sysctl_get_sid(table, (op == 0001) ? |
| 1747 | SECCLASS_DIR : SECCLASS_FILE, &tsid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1748 | if (rc) { |
| 1749 | /* Default to the well-defined sysctl SID. */ |
| 1750 | tsid = SECINITSID_SYSCTL; |
| 1751 | } |
| 1752 | |
| 1753 | /* The op values are "defined" in sysctl.c, thereby creating |
| 1754 | * a bad coupling between this module and sysctl.c */ |
| 1755 | if(op == 001) { |
| 1756 | error = avc_has_perm(tsec->sid, tsid, |
| 1757 | SECCLASS_DIR, DIR__SEARCH, NULL); |
| 1758 | } else { |
| 1759 | av = 0; |
| 1760 | if (op & 004) |
| 1761 | av |= FILE__READ; |
| 1762 | if (op & 002) |
| 1763 | av |= FILE__WRITE; |
| 1764 | if (av) |
| 1765 | error = avc_has_perm(tsec->sid, tsid, |
| 1766 | SECCLASS_FILE, av, NULL); |
| 1767 | } |
| 1768 | |
| 1769 | return error; |
| 1770 | } |
| 1771 | |
| 1772 | static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb) |
| 1773 | { |
| 1774 | int rc = 0; |
| 1775 | |
| 1776 | if (!sb) |
| 1777 | return 0; |
| 1778 | |
| 1779 | switch (cmds) { |
| 1780 | case Q_SYNC: |
| 1781 | case Q_QUOTAON: |
| 1782 | case Q_QUOTAOFF: |
| 1783 | case Q_SETINFO: |
| 1784 | case Q_SETQUOTA: |
| 1785 | rc = superblock_has_perm(current, |
| 1786 | sb, |
| 1787 | FILESYSTEM__QUOTAMOD, NULL); |
| 1788 | break; |
| 1789 | case Q_GETFMT: |
| 1790 | case Q_GETINFO: |
| 1791 | case Q_GETQUOTA: |
| 1792 | rc = superblock_has_perm(current, |
| 1793 | sb, |
| 1794 | FILESYSTEM__QUOTAGET, NULL); |
| 1795 | break; |
| 1796 | default: |
| 1797 | rc = 0; /* let the kernel handle invalid cmds */ |
| 1798 | break; |
| 1799 | } |
| 1800 | return rc; |
| 1801 | } |
| 1802 | |
| 1803 | static int selinux_quota_on(struct dentry *dentry) |
| 1804 | { |
| 1805 | return dentry_has_perm(current, NULL, dentry, FILE__QUOTAON); |
| 1806 | } |
| 1807 | |
| 1808 | static int selinux_syslog(int type) |
| 1809 | { |
| 1810 | int rc; |
| 1811 | |
| 1812 | rc = secondary_ops->syslog(type); |
| 1813 | if (rc) |
| 1814 | return rc; |
| 1815 | |
| 1816 | switch (type) { |
| 1817 | case 3: /* Read last kernel messages */ |
| 1818 | case 10: /* Return size of the log buffer */ |
| 1819 | rc = task_has_system(current, SYSTEM__SYSLOG_READ); |
| 1820 | break; |
| 1821 | case 6: /* Disable logging to console */ |
| 1822 | case 7: /* Enable logging to console */ |
| 1823 | case 8: /* Set level of messages printed to console */ |
| 1824 | rc = task_has_system(current, SYSTEM__SYSLOG_CONSOLE); |
| 1825 | break; |
| 1826 | case 0: /* Close log */ |
| 1827 | case 1: /* Open log */ |
| 1828 | case 2: /* Read from log */ |
| 1829 | case 4: /* Read/clear last kernel messages */ |
| 1830 | case 5: /* Clear ring buffer */ |
| 1831 | default: |
| 1832 | rc = task_has_system(current, SYSTEM__SYSLOG_MOD); |
| 1833 | break; |
| 1834 | } |
| 1835 | return rc; |
| 1836 | } |
| 1837 | |
| 1838 | /* |
| 1839 | * Check that a process has enough memory to allocate a new virtual |
| 1840 | * mapping. 0 means there is enough memory for the allocation to |
| 1841 | * succeed and -ENOMEM implies there is not. |
| 1842 | * |
| 1843 | * Note that secondary_ops->capable and task_has_perm_noaudit return 0 |
| 1844 | * if the capability is granted, but __vm_enough_memory requires 1 if |
| 1845 | * the capability is granted. |
| 1846 | * |
| 1847 | * Do not audit the selinux permission check, as this is applied to all |
| 1848 | * processes that allocate mappings. |
| 1849 | */ |
Alan Cox | 34b4e4a | 2007-08-22 14:01:28 -0700 | [diff] [blame] | 1850 | static int selinux_vm_enough_memory(struct mm_struct *mm, long pages) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1851 | { |
| 1852 | int rc, cap_sys_admin = 0; |
| 1853 | struct task_security_struct *tsec = current->security; |
| 1854 | |
| 1855 | rc = secondary_ops->capable(current, CAP_SYS_ADMIN); |
| 1856 | if (rc == 0) |
| 1857 | rc = avc_has_perm_noaudit(tsec->sid, tsec->sid, |
Stephen Smalley | 2c3c05d | 2007-06-07 15:34:10 -0400 | [diff] [blame] | 1858 | SECCLASS_CAPABILITY, |
| 1859 | CAP_TO_MASK(CAP_SYS_ADMIN), |
| 1860 | 0, |
| 1861 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1862 | |
| 1863 | if (rc == 0) |
| 1864 | cap_sys_admin = 1; |
| 1865 | |
Alan Cox | 34b4e4a | 2007-08-22 14:01:28 -0700 | [diff] [blame] | 1866 | return __vm_enough_memory(mm, pages, cap_sys_admin); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1867 | } |
| 1868 | |
| 1869 | /* binprm security operations */ |
| 1870 | |
| 1871 | static int selinux_bprm_alloc_security(struct linux_binprm *bprm) |
| 1872 | { |
| 1873 | struct bprm_security_struct *bsec; |
| 1874 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 1875 | bsec = kzalloc(sizeof(struct bprm_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1876 | if (!bsec) |
| 1877 | return -ENOMEM; |
| 1878 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1879 | bsec->bprm = bprm; |
| 1880 | bsec->sid = SECINITSID_UNLABELED; |
| 1881 | bsec->set = 0; |
| 1882 | |
| 1883 | bprm->security = bsec; |
| 1884 | return 0; |
| 1885 | } |
| 1886 | |
| 1887 | static int selinux_bprm_set_security(struct linux_binprm *bprm) |
| 1888 | { |
| 1889 | struct task_security_struct *tsec; |
Josef Sipek | 3d5ff52 | 2006-12-08 02:37:38 -0800 | [diff] [blame] | 1890 | struct inode *inode = bprm->file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1891 | struct inode_security_struct *isec; |
| 1892 | struct bprm_security_struct *bsec; |
| 1893 | u32 newsid; |
| 1894 | struct avc_audit_data ad; |
| 1895 | int rc; |
| 1896 | |
| 1897 | rc = secondary_ops->bprm_set_security(bprm); |
| 1898 | if (rc) |
| 1899 | return rc; |
| 1900 | |
| 1901 | bsec = bprm->security; |
| 1902 | |
| 1903 | if (bsec->set) |
| 1904 | return 0; |
| 1905 | |
| 1906 | tsec = current->security; |
| 1907 | isec = inode->i_security; |
| 1908 | |
| 1909 | /* Default to the current task SID. */ |
| 1910 | bsec->sid = tsec->sid; |
| 1911 | |
Michael LeMay | 28eba5b | 2006-06-27 02:53:42 -0700 | [diff] [blame] | 1912 | /* Reset fs, key, and sock SIDs on execve. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1913 | tsec->create_sid = 0; |
Michael LeMay | 28eba5b | 2006-06-27 02:53:42 -0700 | [diff] [blame] | 1914 | tsec->keycreate_sid = 0; |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 1915 | tsec->sockcreate_sid = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1916 | |
| 1917 | if (tsec->exec_sid) { |
| 1918 | newsid = tsec->exec_sid; |
| 1919 | /* Reset exec SID on execve. */ |
| 1920 | tsec->exec_sid = 0; |
| 1921 | } else { |
| 1922 | /* Check for a default transition on this program. */ |
| 1923 | rc = security_transition_sid(tsec->sid, isec->sid, |
| 1924 | SECCLASS_PROCESS, &newsid); |
| 1925 | if (rc) |
| 1926 | return rc; |
| 1927 | } |
| 1928 | |
| 1929 | AVC_AUDIT_DATA_INIT(&ad, FS); |
Josef Sipek | 3d5ff52 | 2006-12-08 02:37:38 -0800 | [diff] [blame] | 1930 | ad.u.fs.mnt = bprm->file->f_path.mnt; |
| 1931 | ad.u.fs.dentry = bprm->file->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1932 | |
Josef Sipek | 3d5ff52 | 2006-12-08 02:37:38 -0800 | [diff] [blame] | 1933 | if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1934 | newsid = tsec->sid; |
| 1935 | |
| 1936 | if (tsec->sid == newsid) { |
| 1937 | rc = avc_has_perm(tsec->sid, isec->sid, |
| 1938 | SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad); |
| 1939 | if (rc) |
| 1940 | return rc; |
| 1941 | } else { |
| 1942 | /* Check permissions for the transition. */ |
| 1943 | rc = avc_has_perm(tsec->sid, newsid, |
| 1944 | SECCLASS_PROCESS, PROCESS__TRANSITION, &ad); |
| 1945 | if (rc) |
| 1946 | return rc; |
| 1947 | |
| 1948 | rc = avc_has_perm(newsid, isec->sid, |
| 1949 | SECCLASS_FILE, FILE__ENTRYPOINT, &ad); |
| 1950 | if (rc) |
| 1951 | return rc; |
| 1952 | |
| 1953 | /* Clear any possibly unsafe personality bits on exec: */ |
| 1954 | current->personality &= ~PER_CLEAR_ON_SETID; |
| 1955 | |
| 1956 | /* Set the security field to the new SID. */ |
| 1957 | bsec->sid = newsid; |
| 1958 | } |
| 1959 | |
| 1960 | bsec->set = 1; |
| 1961 | return 0; |
| 1962 | } |
| 1963 | |
| 1964 | static int selinux_bprm_check_security (struct linux_binprm *bprm) |
| 1965 | { |
| 1966 | return secondary_ops->bprm_check_security(bprm); |
| 1967 | } |
| 1968 | |
| 1969 | |
| 1970 | static int selinux_bprm_secureexec (struct linux_binprm *bprm) |
| 1971 | { |
| 1972 | struct task_security_struct *tsec = current->security; |
| 1973 | int atsecure = 0; |
| 1974 | |
| 1975 | if (tsec->osid != tsec->sid) { |
| 1976 | /* Enable secure mode for SIDs transitions unless |
| 1977 | the noatsecure permission is granted between |
| 1978 | the two SIDs, i.e. ahp returns 0. */ |
| 1979 | atsecure = avc_has_perm(tsec->osid, tsec->sid, |
| 1980 | SECCLASS_PROCESS, |
| 1981 | PROCESS__NOATSECURE, NULL); |
| 1982 | } |
| 1983 | |
| 1984 | return (atsecure || secondary_ops->bprm_secureexec(bprm)); |
| 1985 | } |
| 1986 | |
| 1987 | static void selinux_bprm_free_security(struct linux_binprm *bprm) |
| 1988 | { |
Jesper Juhl | 9a5f04b | 2005-06-25 14:58:51 -0700 | [diff] [blame] | 1989 | kfree(bprm->security); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1990 | bprm->security = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1991 | } |
| 1992 | |
| 1993 | extern struct vfsmount *selinuxfs_mount; |
| 1994 | extern struct dentry *selinux_null; |
| 1995 | |
| 1996 | /* Derived from fs/exec.c:flush_old_files. */ |
| 1997 | static inline void flush_unauthorized_files(struct files_struct * files) |
| 1998 | { |
| 1999 | struct avc_audit_data ad; |
| 2000 | struct file *file, *devnull = NULL; |
Stephen Smalley | b20c812 | 2006-09-25 23:32:03 -0700 | [diff] [blame] | 2001 | struct tty_struct *tty; |
Dipankar Sarma | badf166 | 2005-09-09 13:04:10 -0700 | [diff] [blame] | 2002 | struct fdtable *fdt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2003 | long j = -1; |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 2004 | int drop_tty = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2005 | |
Stephen Smalley | b20c812 | 2006-09-25 23:32:03 -0700 | [diff] [blame] | 2006 | mutex_lock(&tty_mutex); |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 2007 | tty = get_current_tty(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2008 | if (tty) { |
| 2009 | file_list_lock(); |
Eric Dumazet | 2f51201 | 2005-10-30 15:02:16 -0800 | [diff] [blame] | 2010 | 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] | 2011 | if (file) { |
| 2012 | /* Revalidate access to controlling tty. |
| 2013 | Use inode_has_perm on the tty inode directly rather |
| 2014 | than using file_has_perm, as this particular open |
| 2015 | file may belong to another process and we are only |
| 2016 | interested in the inode-based check here. */ |
Josef Sipek | 3d5ff52 | 2006-12-08 02:37:38 -0800 | [diff] [blame] | 2017 | struct inode *inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2018 | if (inode_has_perm(current, inode, |
| 2019 | FILE__READ | FILE__WRITE, NULL)) { |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 2020 | drop_tty = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2021 | } |
| 2022 | } |
| 2023 | file_list_unlock(); |
| 2024 | } |
Stephen Smalley | b20c812 | 2006-09-25 23:32:03 -0700 | [diff] [blame] | 2025 | mutex_unlock(&tty_mutex); |
Eric W. Biederman | 98a27ba | 2007-05-08 00:26:56 -0700 | [diff] [blame] | 2026 | /* Reset controlling tty. */ |
| 2027 | if (drop_tty) |
| 2028 | no_tty(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2029 | |
| 2030 | /* Revalidate access to inherited open files. */ |
| 2031 | |
| 2032 | AVC_AUDIT_DATA_INIT(&ad,FS); |
| 2033 | |
| 2034 | spin_lock(&files->file_lock); |
| 2035 | for (;;) { |
| 2036 | unsigned long set, i; |
| 2037 | int fd; |
| 2038 | |
| 2039 | j++; |
| 2040 | i = j * __NFDBITS; |
Dipankar Sarma | badf166 | 2005-09-09 13:04:10 -0700 | [diff] [blame] | 2041 | fdt = files_fdtable(files); |
Vadim Lobanov | bbea9f6 | 2006-12-10 02:21:12 -0800 | [diff] [blame] | 2042 | if (i >= fdt->max_fds) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2043 | break; |
Dipankar Sarma | badf166 | 2005-09-09 13:04:10 -0700 | [diff] [blame] | 2044 | set = fdt->open_fds->fds_bits[j]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2045 | if (!set) |
| 2046 | continue; |
| 2047 | spin_unlock(&files->file_lock); |
| 2048 | for ( ; set ; i++,set >>= 1) { |
| 2049 | if (set & 1) { |
| 2050 | file = fget(i); |
| 2051 | if (!file) |
| 2052 | continue; |
| 2053 | if (file_has_perm(current, |
| 2054 | file, |
| 2055 | file_to_av(file))) { |
| 2056 | sys_close(i); |
| 2057 | fd = get_unused_fd(); |
| 2058 | if (fd != i) { |
| 2059 | if (fd >= 0) |
| 2060 | put_unused_fd(fd); |
| 2061 | fput(file); |
| 2062 | continue; |
| 2063 | } |
| 2064 | if (devnull) { |
Nick Piggin | 095975d | 2006-01-08 01:02:19 -0800 | [diff] [blame] | 2065 | get_file(devnull); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2066 | } else { |
| 2067 | devnull = dentry_open(dget(selinux_null), mntget(selinuxfs_mount), O_RDWR); |
Akinobu Mita | fc5d81e | 2006-11-27 15:16:48 +0900 | [diff] [blame] | 2068 | if (IS_ERR(devnull)) { |
| 2069 | devnull = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2070 | put_unused_fd(fd); |
| 2071 | fput(file); |
| 2072 | continue; |
| 2073 | } |
| 2074 | } |
| 2075 | fd_install(fd, devnull); |
| 2076 | } |
| 2077 | fput(file); |
| 2078 | } |
| 2079 | } |
| 2080 | spin_lock(&files->file_lock); |
| 2081 | |
| 2082 | } |
| 2083 | spin_unlock(&files->file_lock); |
| 2084 | } |
| 2085 | |
| 2086 | static void selinux_bprm_apply_creds(struct linux_binprm *bprm, int unsafe) |
| 2087 | { |
| 2088 | struct task_security_struct *tsec; |
| 2089 | struct bprm_security_struct *bsec; |
| 2090 | u32 sid; |
| 2091 | int rc; |
| 2092 | |
| 2093 | secondary_ops->bprm_apply_creds(bprm, unsafe); |
| 2094 | |
| 2095 | tsec = current->security; |
| 2096 | |
| 2097 | bsec = bprm->security; |
| 2098 | sid = bsec->sid; |
| 2099 | |
| 2100 | tsec->osid = tsec->sid; |
| 2101 | bsec->unsafe = 0; |
| 2102 | if (tsec->sid != sid) { |
| 2103 | /* Check for shared state. If not ok, leave SID |
| 2104 | unchanged and kill. */ |
| 2105 | if (unsafe & LSM_UNSAFE_SHARE) { |
| 2106 | rc = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS, |
| 2107 | PROCESS__SHARE, NULL); |
| 2108 | if (rc) { |
| 2109 | bsec->unsafe = 1; |
| 2110 | return; |
| 2111 | } |
| 2112 | } |
| 2113 | |
| 2114 | /* Check for ptracing, and update the task SID if ok. |
| 2115 | Otherwise, leave SID unchanged and kill. */ |
| 2116 | if (unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) { |
| 2117 | rc = avc_has_perm(tsec->ptrace_sid, sid, |
| 2118 | SECCLASS_PROCESS, PROCESS__PTRACE, |
| 2119 | NULL); |
| 2120 | if (rc) { |
| 2121 | bsec->unsafe = 1; |
| 2122 | return; |
| 2123 | } |
| 2124 | } |
| 2125 | tsec->sid = sid; |
| 2126 | } |
| 2127 | } |
| 2128 | |
| 2129 | /* |
| 2130 | * called after apply_creds without the task lock held |
| 2131 | */ |
| 2132 | static void selinux_bprm_post_apply_creds(struct linux_binprm *bprm) |
| 2133 | { |
| 2134 | struct task_security_struct *tsec; |
| 2135 | struct rlimit *rlim, *initrlim; |
| 2136 | struct itimerval itimer; |
| 2137 | struct bprm_security_struct *bsec; |
| 2138 | int rc, i; |
| 2139 | |
| 2140 | tsec = current->security; |
| 2141 | bsec = bprm->security; |
| 2142 | |
| 2143 | if (bsec->unsafe) { |
| 2144 | force_sig_specific(SIGKILL, current); |
| 2145 | return; |
| 2146 | } |
| 2147 | if (tsec->osid == tsec->sid) |
| 2148 | return; |
| 2149 | |
| 2150 | /* Close files for which the new task SID is not authorized. */ |
| 2151 | flush_unauthorized_files(current->files); |
| 2152 | |
| 2153 | /* Check whether the new SID can inherit signal state |
| 2154 | from the old SID. If not, clear itimers to avoid |
| 2155 | subsequent signal generation and flush and unblock |
| 2156 | signals. This must occur _after_ the task SID has |
| 2157 | been updated so that any kill done after the flush |
| 2158 | will be checked against the new SID. */ |
| 2159 | rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS, |
| 2160 | PROCESS__SIGINH, NULL); |
| 2161 | if (rc) { |
| 2162 | memset(&itimer, 0, sizeof itimer); |
| 2163 | for (i = 0; i < 3; i++) |
| 2164 | do_setitimer(i, &itimer, NULL); |
| 2165 | flush_signals(current); |
| 2166 | spin_lock_irq(¤t->sighand->siglock); |
| 2167 | flush_signal_handlers(current, 1); |
| 2168 | sigemptyset(¤t->blocked); |
| 2169 | recalc_sigpending(); |
| 2170 | spin_unlock_irq(¤t->sighand->siglock); |
| 2171 | } |
| 2172 | |
Stephen Smalley | 4ac212a | 2007-08-29 08:51:50 -0400 | [diff] [blame] | 2173 | /* Always clear parent death signal on SID transitions. */ |
| 2174 | current->pdeath_signal = 0; |
| 2175 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2176 | /* Check whether the new SID can inherit resource limits |
| 2177 | from the old SID. If not, reset all soft limits to |
| 2178 | the lower of the current task's hard limit and the init |
| 2179 | task's soft limit. Note that the setting of hard limits |
| 2180 | (even to lower them) can be controlled by the setrlimit |
| 2181 | check. The inclusion of the init task's soft limit into |
| 2182 | the computation is to avoid resetting soft limits higher |
| 2183 | than the default soft limit for cases where the default |
| 2184 | is lower than the hard limit, e.g. RLIMIT_CORE or |
| 2185 | RLIMIT_STACK.*/ |
| 2186 | rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS, |
| 2187 | PROCESS__RLIMITINH, NULL); |
| 2188 | if (rc) { |
| 2189 | for (i = 0; i < RLIM_NLIMITS; i++) { |
| 2190 | rlim = current->signal->rlim + i; |
| 2191 | initrlim = init_task.signal->rlim+i; |
| 2192 | rlim->rlim_cur = min(rlim->rlim_max,initrlim->rlim_cur); |
| 2193 | } |
| 2194 | if (current->signal->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY) { |
| 2195 | /* |
| 2196 | * This will cause RLIMIT_CPU calculations |
| 2197 | * to be refigured. |
| 2198 | */ |
| 2199 | current->it_prof_expires = jiffies_to_cputime(1); |
| 2200 | } |
| 2201 | } |
| 2202 | |
| 2203 | /* Wake up the parent if it is waiting so that it can |
| 2204 | recheck wait permission to the new task SID. */ |
| 2205 | wake_up_interruptible(¤t->parent->signal->wait_chldexit); |
| 2206 | } |
| 2207 | |
| 2208 | /* superblock security operations */ |
| 2209 | |
| 2210 | static int selinux_sb_alloc_security(struct super_block *sb) |
| 2211 | { |
| 2212 | return superblock_alloc_security(sb); |
| 2213 | } |
| 2214 | |
| 2215 | static void selinux_sb_free_security(struct super_block *sb) |
| 2216 | { |
| 2217 | superblock_free_security(sb); |
| 2218 | } |
| 2219 | |
| 2220 | static inline int match_prefix(char *prefix, int plen, char *option, int olen) |
| 2221 | { |
| 2222 | if (plen > olen) |
| 2223 | return 0; |
| 2224 | |
| 2225 | return !memcmp(prefix, option, plen); |
| 2226 | } |
| 2227 | |
| 2228 | static inline int selinux_option(char *option, int len) |
| 2229 | { |
| 2230 | return (match_prefix("context=", sizeof("context=")-1, option, len) || |
| 2231 | match_prefix("fscontext=", sizeof("fscontext=")-1, option, len) || |
Eric Paris | 0808925 | 2006-07-10 04:43:55 -0700 | [diff] [blame] | 2232 | match_prefix("defcontext=", sizeof("defcontext=")-1, option, len) || |
| 2233 | match_prefix("rootcontext=", sizeof("rootcontext=")-1, option, len)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2234 | } |
| 2235 | |
| 2236 | static inline void take_option(char **to, char *from, int *first, int len) |
| 2237 | { |
| 2238 | if (!*first) { |
| 2239 | **to = ','; |
| 2240 | *to += 1; |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2241 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2242 | *first = 0; |
| 2243 | memcpy(*to, from, len); |
| 2244 | *to += len; |
| 2245 | } |
| 2246 | |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2247 | static inline void take_selinux_option(char **to, char *from, int *first, |
| 2248 | int len) |
| 2249 | { |
| 2250 | int current_size = 0; |
| 2251 | |
| 2252 | if (!*first) { |
| 2253 | **to = '|'; |
| 2254 | *to += 1; |
| 2255 | } |
| 2256 | else |
| 2257 | *first = 0; |
| 2258 | |
| 2259 | while (current_size < len) { |
| 2260 | if (*from != '"') { |
| 2261 | **to = *from; |
| 2262 | *to += 1; |
| 2263 | } |
| 2264 | from += 1; |
| 2265 | current_size += 1; |
| 2266 | } |
| 2267 | } |
| 2268 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2269 | static int selinux_sb_copy_data(struct file_system_type *type, void *orig, void *copy) |
| 2270 | { |
| 2271 | int fnosec, fsec, rc = 0; |
| 2272 | char *in_save, *in_curr, *in_end; |
| 2273 | char *sec_curr, *nosec_save, *nosec; |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2274 | int open_quote = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2275 | |
| 2276 | in_curr = orig; |
| 2277 | sec_curr = copy; |
| 2278 | |
| 2279 | /* Binary mount data: just copy */ |
| 2280 | if (type->fs_flags & FS_BINARY_MOUNTDATA) { |
| 2281 | copy_page(sec_curr, in_curr); |
| 2282 | goto out; |
| 2283 | } |
| 2284 | |
| 2285 | nosec = (char *)get_zeroed_page(GFP_KERNEL); |
| 2286 | if (!nosec) { |
| 2287 | rc = -ENOMEM; |
| 2288 | goto out; |
| 2289 | } |
| 2290 | |
| 2291 | nosec_save = nosec; |
| 2292 | fnosec = fsec = 1; |
| 2293 | in_save = in_end = orig; |
| 2294 | |
| 2295 | do { |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2296 | if (*in_end == '"') |
| 2297 | open_quote = !open_quote; |
| 2298 | if ((*in_end == ',' && open_quote == 0) || |
| 2299 | *in_end == '\0') { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2300 | int len = in_end - in_curr; |
| 2301 | |
| 2302 | if (selinux_option(in_curr, len)) |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2303 | take_selinux_option(&sec_curr, in_curr, &fsec, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2304 | else |
| 2305 | take_option(&nosec, in_curr, &fnosec, len); |
| 2306 | |
| 2307 | in_curr = in_end + 1; |
| 2308 | } |
| 2309 | } while (*in_end++); |
| 2310 | |
Eric Paris | 6931dfc | 2005-06-30 02:58:51 -0700 | [diff] [blame] | 2311 | strcpy(in_save, nosec_save); |
Gerald Schaefer | da3caa2 | 2005-06-21 17:15:18 -0700 | [diff] [blame] | 2312 | free_page((unsigned long)nosec_save); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2313 | out: |
| 2314 | return rc; |
| 2315 | } |
| 2316 | |
| 2317 | static int selinux_sb_kern_mount(struct super_block *sb, void *data) |
| 2318 | { |
| 2319 | struct avc_audit_data ad; |
| 2320 | int rc; |
| 2321 | |
| 2322 | rc = superblock_doinit(sb, data); |
| 2323 | if (rc) |
| 2324 | return rc; |
| 2325 | |
| 2326 | AVC_AUDIT_DATA_INIT(&ad,FS); |
| 2327 | ad.u.fs.dentry = sb->s_root; |
| 2328 | return superblock_has_perm(current, sb, FILESYSTEM__MOUNT, &ad); |
| 2329 | } |
| 2330 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 2331 | static int selinux_sb_statfs(struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2332 | { |
| 2333 | struct avc_audit_data ad; |
| 2334 | |
| 2335 | AVC_AUDIT_DATA_INIT(&ad,FS); |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 2336 | ad.u.fs.dentry = dentry->d_sb->s_root; |
| 2337 | return superblock_has_perm(current, dentry->d_sb, FILESYSTEM__GETATTR, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2338 | } |
| 2339 | |
| 2340 | static int selinux_mount(char * dev_name, |
| 2341 | struct nameidata *nd, |
| 2342 | char * type, |
| 2343 | unsigned long flags, |
| 2344 | void * data) |
| 2345 | { |
| 2346 | int rc; |
| 2347 | |
| 2348 | rc = secondary_ops->sb_mount(dev_name, nd, type, flags, data); |
| 2349 | if (rc) |
| 2350 | return rc; |
| 2351 | |
| 2352 | if (flags & MS_REMOUNT) |
| 2353 | return superblock_has_perm(current, nd->mnt->mnt_sb, |
| 2354 | FILESYSTEM__REMOUNT, NULL); |
| 2355 | else |
| 2356 | return dentry_has_perm(current, nd->mnt, nd->dentry, |
| 2357 | FILE__MOUNTON); |
| 2358 | } |
| 2359 | |
| 2360 | static int selinux_umount(struct vfsmount *mnt, int flags) |
| 2361 | { |
| 2362 | int rc; |
| 2363 | |
| 2364 | rc = secondary_ops->sb_umount(mnt, flags); |
| 2365 | if (rc) |
| 2366 | return rc; |
| 2367 | |
| 2368 | return superblock_has_perm(current,mnt->mnt_sb, |
| 2369 | FILESYSTEM__UNMOUNT,NULL); |
| 2370 | } |
| 2371 | |
| 2372 | /* inode security operations */ |
| 2373 | |
| 2374 | static int selinux_inode_alloc_security(struct inode *inode) |
| 2375 | { |
| 2376 | return inode_alloc_security(inode); |
| 2377 | } |
| 2378 | |
| 2379 | static void selinux_inode_free_security(struct inode *inode) |
| 2380 | { |
| 2381 | inode_free_security(inode); |
| 2382 | } |
| 2383 | |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2384 | static int selinux_inode_init_security(struct inode *inode, struct inode *dir, |
| 2385 | char **name, void **value, |
| 2386 | size_t *len) |
| 2387 | { |
| 2388 | struct task_security_struct *tsec; |
| 2389 | struct inode_security_struct *dsec; |
| 2390 | struct superblock_security_struct *sbsec; |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 2391 | u32 newsid, clen; |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2392 | int rc; |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 2393 | char *namep = NULL, *context; |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2394 | |
| 2395 | tsec = current->security; |
| 2396 | dsec = dir->i_security; |
| 2397 | sbsec = dir->i_sb->s_security; |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2398 | |
| 2399 | if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) { |
| 2400 | newsid = tsec->create_sid; |
| 2401 | } else { |
| 2402 | rc = security_transition_sid(tsec->sid, dsec->sid, |
| 2403 | inode_mode_to_security_class(inode->i_mode), |
| 2404 | &newsid); |
| 2405 | if (rc) { |
| 2406 | printk(KERN_WARNING "%s: " |
| 2407 | "security_transition_sid failed, rc=%d (dev=%s " |
| 2408 | "ino=%ld)\n", |
| 2409 | __FUNCTION__, |
| 2410 | -rc, inode->i_sb->s_id, inode->i_ino); |
| 2411 | return rc; |
| 2412 | } |
| 2413 | } |
| 2414 | |
Eric Paris | 296fddf | 2006-09-25 23:32:00 -0700 | [diff] [blame] | 2415 | /* Possibly defer initialization to selinux_complete_init. */ |
| 2416 | if (sbsec->initialized) { |
| 2417 | struct inode_security_struct *isec = inode->i_security; |
| 2418 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
| 2419 | isec->sid = newsid; |
| 2420 | isec->initialized = 1; |
| 2421 | } |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2422 | |
Stephen Smalley | 8aad387 | 2006-03-22 00:09:13 -0800 | [diff] [blame] | 2423 | if (!ss_initialized || sbsec->behavior == SECURITY_FS_USE_MNTPOINT) |
Stephen Smalley | 25a74f3 | 2005-11-08 21:34:33 -0800 | [diff] [blame] | 2424 | return -EOPNOTSUPP; |
| 2425 | |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 2426 | if (name) { |
| 2427 | namep = kstrdup(XATTR_SELINUX_SUFFIX, GFP_KERNEL); |
| 2428 | if (!namep) |
| 2429 | return -ENOMEM; |
| 2430 | *name = namep; |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2431 | } |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 2432 | |
| 2433 | if (value && len) { |
| 2434 | rc = security_sid_to_context(newsid, &context, &clen); |
| 2435 | if (rc) { |
| 2436 | kfree(namep); |
| 2437 | return rc; |
| 2438 | } |
| 2439 | *value = context; |
| 2440 | *len = clen; |
| 2441 | } |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2442 | |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2443 | return 0; |
| 2444 | } |
| 2445 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2446 | static int selinux_inode_create(struct inode *dir, struct dentry *dentry, int mask) |
| 2447 | { |
| 2448 | return may_create(dir, dentry, SECCLASS_FILE); |
| 2449 | } |
| 2450 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2451 | static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry) |
| 2452 | { |
| 2453 | int rc; |
| 2454 | |
| 2455 | rc = secondary_ops->inode_link(old_dentry,dir,new_dentry); |
| 2456 | if (rc) |
| 2457 | return rc; |
| 2458 | return may_link(dir, old_dentry, MAY_LINK); |
| 2459 | } |
| 2460 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2461 | static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry) |
| 2462 | { |
| 2463 | int rc; |
| 2464 | |
| 2465 | rc = secondary_ops->inode_unlink(dir, dentry); |
| 2466 | if (rc) |
| 2467 | return rc; |
| 2468 | return may_link(dir, dentry, MAY_UNLINK); |
| 2469 | } |
| 2470 | |
| 2471 | static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const char *name) |
| 2472 | { |
| 2473 | return may_create(dir, dentry, SECCLASS_LNK_FILE); |
| 2474 | } |
| 2475 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2476 | static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, int mask) |
| 2477 | { |
| 2478 | return may_create(dir, dentry, SECCLASS_DIR); |
| 2479 | } |
| 2480 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2481 | static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry) |
| 2482 | { |
| 2483 | return may_link(dir, dentry, MAY_RMDIR); |
| 2484 | } |
| 2485 | |
| 2486 | static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) |
| 2487 | { |
| 2488 | int rc; |
| 2489 | |
| 2490 | rc = secondary_ops->inode_mknod(dir, dentry, mode, dev); |
| 2491 | if (rc) |
| 2492 | return rc; |
| 2493 | |
| 2494 | return may_create(dir, dentry, inode_mode_to_security_class(mode)); |
| 2495 | } |
| 2496 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2497 | static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry, |
| 2498 | struct inode *new_inode, struct dentry *new_dentry) |
| 2499 | { |
| 2500 | return may_rename(old_inode, old_dentry, new_inode, new_dentry); |
| 2501 | } |
| 2502 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2503 | static int selinux_inode_readlink(struct dentry *dentry) |
| 2504 | { |
| 2505 | return dentry_has_perm(current, NULL, dentry, FILE__READ); |
| 2506 | } |
| 2507 | |
| 2508 | static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *nameidata) |
| 2509 | { |
| 2510 | int rc; |
| 2511 | |
| 2512 | rc = secondary_ops->inode_follow_link(dentry,nameidata); |
| 2513 | if (rc) |
| 2514 | return rc; |
| 2515 | return dentry_has_perm(current, NULL, dentry, FILE__READ); |
| 2516 | } |
| 2517 | |
| 2518 | static int selinux_inode_permission(struct inode *inode, int mask, |
| 2519 | struct nameidata *nd) |
| 2520 | { |
| 2521 | int rc; |
| 2522 | |
| 2523 | rc = secondary_ops->inode_permission(inode, mask, nd); |
| 2524 | if (rc) |
| 2525 | return rc; |
| 2526 | |
| 2527 | if (!mask) { |
| 2528 | /* No permission to check. Existence test. */ |
| 2529 | return 0; |
| 2530 | } |
| 2531 | |
| 2532 | return inode_has_perm(current, inode, |
| 2533 | file_mask_to_av(inode->i_mode, mask), NULL); |
| 2534 | } |
| 2535 | |
| 2536 | static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr) |
| 2537 | { |
| 2538 | int rc; |
| 2539 | |
| 2540 | rc = secondary_ops->inode_setattr(dentry, iattr); |
| 2541 | if (rc) |
| 2542 | return rc; |
| 2543 | |
| 2544 | if (iattr->ia_valid & ATTR_FORCE) |
| 2545 | return 0; |
| 2546 | |
| 2547 | if (iattr->ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | |
| 2548 | ATTR_ATIME_SET | ATTR_MTIME_SET)) |
| 2549 | return dentry_has_perm(current, NULL, dentry, FILE__SETATTR); |
| 2550 | |
| 2551 | return dentry_has_perm(current, NULL, dentry, FILE__WRITE); |
| 2552 | } |
| 2553 | |
| 2554 | static int selinux_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) |
| 2555 | { |
| 2556 | return dentry_has_perm(current, mnt, dentry, FILE__GETATTR); |
| 2557 | } |
| 2558 | |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 2559 | static int selinux_inode_setotherxattr(struct dentry *dentry, char *name) |
| 2560 | { |
| 2561 | if (!strncmp(name, XATTR_SECURITY_PREFIX, |
| 2562 | sizeof XATTR_SECURITY_PREFIX - 1)) { |
| 2563 | if (!strcmp(name, XATTR_NAME_CAPS)) { |
| 2564 | if (!capable(CAP_SETFCAP)) |
| 2565 | return -EPERM; |
| 2566 | } else if (!capable(CAP_SYS_ADMIN)) { |
| 2567 | /* A different attribute in the security namespace. |
| 2568 | Restrict to administrator. */ |
| 2569 | return -EPERM; |
| 2570 | } |
| 2571 | } |
| 2572 | |
| 2573 | /* Not an attribute we recognize, so just check the |
| 2574 | ordinary setattr permission. */ |
| 2575 | return dentry_has_perm(current, NULL, dentry, FILE__SETATTR); |
| 2576 | } |
| 2577 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2578 | static int selinux_inode_setxattr(struct dentry *dentry, char *name, void *value, size_t size, int flags) |
| 2579 | { |
| 2580 | struct task_security_struct *tsec = current->security; |
| 2581 | struct inode *inode = dentry->d_inode; |
| 2582 | struct inode_security_struct *isec = inode->i_security; |
| 2583 | struct superblock_security_struct *sbsec; |
| 2584 | struct avc_audit_data ad; |
| 2585 | u32 newsid; |
| 2586 | int rc = 0; |
| 2587 | |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 2588 | if (strcmp(name, XATTR_NAME_SELINUX)) |
| 2589 | return selinux_inode_setotherxattr(dentry, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2590 | |
| 2591 | sbsec = inode->i_sb->s_security; |
| 2592 | if (sbsec->behavior == SECURITY_FS_USE_MNTPOINT) |
| 2593 | return -EOPNOTSUPP; |
| 2594 | |
Satyam Sharma | 3bd858a | 2007-07-17 15:00:08 +0530 | [diff] [blame] | 2595 | if (!is_owner_or_cap(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2596 | return -EPERM; |
| 2597 | |
| 2598 | AVC_AUDIT_DATA_INIT(&ad,FS); |
| 2599 | ad.u.fs.dentry = dentry; |
| 2600 | |
| 2601 | rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass, |
| 2602 | FILE__RELABELFROM, &ad); |
| 2603 | if (rc) |
| 2604 | return rc; |
| 2605 | |
| 2606 | rc = security_context_to_sid(value, size, &newsid); |
| 2607 | if (rc) |
| 2608 | return rc; |
| 2609 | |
| 2610 | rc = avc_has_perm(tsec->sid, newsid, isec->sclass, |
| 2611 | FILE__RELABELTO, &ad); |
| 2612 | if (rc) |
| 2613 | return rc; |
| 2614 | |
| 2615 | rc = security_validate_transition(isec->sid, newsid, tsec->sid, |
| 2616 | isec->sclass); |
| 2617 | if (rc) |
| 2618 | return rc; |
| 2619 | |
| 2620 | return avc_has_perm(newsid, |
| 2621 | sbsec->sid, |
| 2622 | SECCLASS_FILESYSTEM, |
| 2623 | FILESYSTEM__ASSOCIATE, |
| 2624 | &ad); |
| 2625 | } |
| 2626 | |
| 2627 | static void selinux_inode_post_setxattr(struct dentry *dentry, char *name, |
| 2628 | void *value, size_t size, int flags) |
| 2629 | { |
| 2630 | struct inode *inode = dentry->d_inode; |
| 2631 | struct inode_security_struct *isec = inode->i_security; |
| 2632 | u32 newsid; |
| 2633 | int rc; |
| 2634 | |
| 2635 | if (strcmp(name, XATTR_NAME_SELINUX)) { |
| 2636 | /* Not an attribute we recognize, so nothing to do. */ |
| 2637 | return; |
| 2638 | } |
| 2639 | |
| 2640 | rc = security_context_to_sid(value, size, &newsid); |
| 2641 | if (rc) { |
| 2642 | printk(KERN_WARNING "%s: unable to obtain SID for context " |
| 2643 | "%s, rc=%d\n", __FUNCTION__, (char*)value, -rc); |
| 2644 | return; |
| 2645 | } |
| 2646 | |
| 2647 | isec->sid = newsid; |
| 2648 | return; |
| 2649 | } |
| 2650 | |
| 2651 | static int selinux_inode_getxattr (struct dentry *dentry, char *name) |
| 2652 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2653 | return dentry_has_perm(current, NULL, dentry, FILE__GETATTR); |
| 2654 | } |
| 2655 | |
| 2656 | static int selinux_inode_listxattr (struct dentry *dentry) |
| 2657 | { |
| 2658 | return dentry_has_perm(current, NULL, dentry, FILE__GETATTR); |
| 2659 | } |
| 2660 | |
| 2661 | static int selinux_inode_removexattr (struct dentry *dentry, char *name) |
| 2662 | { |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 2663 | if (strcmp(name, XATTR_NAME_SELINUX)) |
| 2664 | return selinux_inode_setotherxattr(dentry, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2665 | |
| 2666 | /* No one is allowed to remove a SELinux security label. |
| 2667 | You can change the label, but all data must be labeled. */ |
| 2668 | return -EACCES; |
| 2669 | } |
| 2670 | |
James Morris | d381d8a | 2005-10-30 14:59:22 -0800 | [diff] [blame] | 2671 | /* |
| 2672 | * Copy the in-core inode security context value to the user. If the |
| 2673 | * getxattr() prior to this succeeded, check to see if we need to |
| 2674 | * canonicalize the value to be finally returned to the user. |
| 2675 | * |
| 2676 | * Permission check is handled by selinux_inode_getxattr hook. |
| 2677 | */ |
Dustin Kirkland | 7306a0b | 2005-11-16 15:53:13 +0000 | [diff] [blame] | 2678 | static int selinux_inode_getsecurity(const struct inode *inode, const char *name, void *buffer, size_t size, int err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2679 | { |
| 2680 | struct inode_security_struct *isec = inode->i_security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2681 | |
Dustin Kirkland | 8c8570f | 2005-11-03 17:15:16 +0000 | [diff] [blame] | 2682 | if (strcmp(name, XATTR_SELINUX_SUFFIX)) |
| 2683 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2684 | |
Dustin Kirkland | 8c8570f | 2005-11-03 17:15:16 +0000 | [diff] [blame] | 2685 | return selinux_getsecurity(isec->sid, buffer, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2686 | } |
| 2687 | |
| 2688 | static int selinux_inode_setsecurity(struct inode *inode, const char *name, |
| 2689 | const void *value, size_t size, int flags) |
| 2690 | { |
| 2691 | struct inode_security_struct *isec = inode->i_security; |
| 2692 | u32 newsid; |
| 2693 | int rc; |
| 2694 | |
| 2695 | if (strcmp(name, XATTR_SELINUX_SUFFIX)) |
| 2696 | return -EOPNOTSUPP; |
| 2697 | |
| 2698 | if (!value || !size) |
| 2699 | return -EACCES; |
| 2700 | |
| 2701 | rc = security_context_to_sid((void*)value, size, &newsid); |
| 2702 | if (rc) |
| 2703 | return rc; |
| 2704 | |
| 2705 | isec->sid = newsid; |
| 2706 | return 0; |
| 2707 | } |
| 2708 | |
| 2709 | static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size) |
| 2710 | { |
| 2711 | const int len = sizeof(XATTR_NAME_SELINUX); |
| 2712 | if (buffer && len <= buffer_size) |
| 2713 | memcpy(buffer, XATTR_NAME_SELINUX, len); |
| 2714 | return len; |
| 2715 | } |
| 2716 | |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 2717 | static int selinux_inode_need_killpriv(struct dentry *dentry) |
| 2718 | { |
| 2719 | return secondary_ops->inode_need_killpriv(dentry); |
| 2720 | } |
| 2721 | |
| 2722 | static int selinux_inode_killpriv(struct dentry *dentry) |
| 2723 | { |
| 2724 | return secondary_ops->inode_killpriv(dentry); |
| 2725 | } |
| 2726 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2727 | /* file security operations */ |
| 2728 | |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 2729 | static int selinux_revalidate_file_permission(struct file *file, int mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2730 | { |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 2731 | int rc; |
Josef Sipek | 3d5ff52 | 2006-12-08 02:37:38 -0800 | [diff] [blame] | 2732 | struct inode *inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2733 | |
| 2734 | if (!mask) { |
| 2735 | /* No permission to check. Existence test. */ |
| 2736 | return 0; |
| 2737 | } |
| 2738 | |
| 2739 | /* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */ |
| 2740 | if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE)) |
| 2741 | mask |= MAY_APPEND; |
| 2742 | |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 2743 | rc = file_has_perm(current, file, |
| 2744 | file_mask_to_av(inode->i_mode, mask)); |
| 2745 | if (rc) |
| 2746 | return rc; |
| 2747 | |
| 2748 | return selinux_netlbl_inode_permission(inode, mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2749 | } |
| 2750 | |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 2751 | static int selinux_file_permission(struct file *file, int mask) |
| 2752 | { |
| 2753 | struct inode *inode = file->f_path.dentry->d_inode; |
| 2754 | struct task_security_struct *tsec = current->security; |
| 2755 | struct file_security_struct *fsec = file->f_security; |
| 2756 | struct inode_security_struct *isec = inode->i_security; |
| 2757 | |
| 2758 | if (!mask) { |
| 2759 | /* No permission to check. Existence test. */ |
| 2760 | return 0; |
| 2761 | } |
| 2762 | |
| 2763 | if (tsec->sid == fsec->sid && fsec->isid == isec->sid |
| 2764 | && fsec->pseqno == avc_policy_seqno()) |
| 2765 | return selinux_netlbl_inode_permission(inode, mask); |
| 2766 | |
| 2767 | return selinux_revalidate_file_permission(file, mask); |
| 2768 | } |
| 2769 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2770 | static int selinux_file_alloc_security(struct file *file) |
| 2771 | { |
| 2772 | return file_alloc_security(file); |
| 2773 | } |
| 2774 | |
| 2775 | static void selinux_file_free_security(struct file *file) |
| 2776 | { |
| 2777 | file_free_security(file); |
| 2778 | } |
| 2779 | |
| 2780 | static int selinux_file_ioctl(struct file *file, unsigned int cmd, |
| 2781 | unsigned long arg) |
| 2782 | { |
| 2783 | int error = 0; |
| 2784 | |
| 2785 | switch (cmd) { |
| 2786 | case FIONREAD: |
| 2787 | /* fall through */ |
| 2788 | case FIBMAP: |
| 2789 | /* fall through */ |
| 2790 | case FIGETBSZ: |
| 2791 | /* fall through */ |
| 2792 | case EXT2_IOC_GETFLAGS: |
| 2793 | /* fall through */ |
| 2794 | case EXT2_IOC_GETVERSION: |
| 2795 | error = file_has_perm(current, file, FILE__GETATTR); |
| 2796 | break; |
| 2797 | |
| 2798 | case EXT2_IOC_SETFLAGS: |
| 2799 | /* fall through */ |
| 2800 | case EXT2_IOC_SETVERSION: |
| 2801 | error = file_has_perm(current, file, FILE__SETATTR); |
| 2802 | break; |
| 2803 | |
| 2804 | /* sys_ioctl() checks */ |
| 2805 | case FIONBIO: |
| 2806 | /* fall through */ |
| 2807 | case FIOASYNC: |
| 2808 | error = file_has_perm(current, file, 0); |
| 2809 | break; |
| 2810 | |
| 2811 | case KDSKBENT: |
| 2812 | case KDSKBSENT: |
| 2813 | error = task_has_capability(current,CAP_SYS_TTY_CONFIG); |
| 2814 | break; |
| 2815 | |
| 2816 | /* default case assumes that the command will go |
| 2817 | * to the file's ioctl() function. |
| 2818 | */ |
| 2819 | default: |
| 2820 | error = file_has_perm(current, file, FILE__IOCTL); |
| 2821 | |
| 2822 | } |
| 2823 | return error; |
| 2824 | } |
| 2825 | |
| 2826 | static int file_map_prot_check(struct file *file, unsigned long prot, int shared) |
| 2827 | { |
| 2828 | #ifndef CONFIG_PPC32 |
| 2829 | if ((prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) { |
| 2830 | /* |
| 2831 | * We are making executable an anonymous mapping or a |
| 2832 | * private file mapping that will also be writable. |
| 2833 | * This has an additional check. |
| 2834 | */ |
| 2835 | int rc = task_has_perm(current, current, PROCESS__EXECMEM); |
| 2836 | if (rc) |
| 2837 | return rc; |
| 2838 | } |
| 2839 | #endif |
| 2840 | |
| 2841 | if (file) { |
| 2842 | /* read access is always possible with a mapping */ |
| 2843 | u32 av = FILE__READ; |
| 2844 | |
| 2845 | /* write access only matters if the mapping is shared */ |
| 2846 | if (shared && (prot & PROT_WRITE)) |
| 2847 | av |= FILE__WRITE; |
| 2848 | |
| 2849 | if (prot & PROT_EXEC) |
| 2850 | av |= FILE__EXECUTE; |
| 2851 | |
| 2852 | return file_has_perm(current, file, av); |
| 2853 | } |
| 2854 | return 0; |
| 2855 | } |
| 2856 | |
| 2857 | static int selinux_file_mmap(struct file *file, unsigned long reqprot, |
Eric Paris | ed03218 | 2007-06-28 15:55:21 -0400 | [diff] [blame] | 2858 | unsigned long prot, unsigned long flags, |
| 2859 | unsigned long addr, unsigned long addr_only) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2860 | { |
Eric Paris | ed03218 | 2007-06-28 15:55:21 -0400 | [diff] [blame] | 2861 | int rc = 0; |
| 2862 | u32 sid = ((struct task_security_struct*)(current->security))->sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2863 | |
Eric Paris | ed03218 | 2007-06-28 15:55:21 -0400 | [diff] [blame] | 2864 | if (addr < mmap_min_addr) |
| 2865 | rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT, |
| 2866 | MEMPROTECT__MMAP_ZERO, NULL); |
| 2867 | if (rc || addr_only) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2868 | return rc; |
| 2869 | |
| 2870 | if (selinux_checkreqprot) |
| 2871 | prot = reqprot; |
| 2872 | |
| 2873 | return file_map_prot_check(file, prot, |
| 2874 | (flags & MAP_TYPE) == MAP_SHARED); |
| 2875 | } |
| 2876 | |
| 2877 | static int selinux_file_mprotect(struct vm_area_struct *vma, |
| 2878 | unsigned long reqprot, |
| 2879 | unsigned long prot) |
| 2880 | { |
| 2881 | int rc; |
| 2882 | |
| 2883 | rc = secondary_ops->file_mprotect(vma, reqprot, prot); |
| 2884 | if (rc) |
| 2885 | return rc; |
| 2886 | |
| 2887 | if (selinux_checkreqprot) |
| 2888 | prot = reqprot; |
| 2889 | |
| 2890 | #ifndef CONFIG_PPC32 |
Stephen Smalley | db4c964 | 2006-02-01 03:05:54 -0800 | [diff] [blame] | 2891 | if ((prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) { |
| 2892 | rc = 0; |
| 2893 | if (vma->vm_start >= vma->vm_mm->start_brk && |
| 2894 | vma->vm_end <= vma->vm_mm->brk) { |
| 2895 | rc = task_has_perm(current, current, |
| 2896 | PROCESS__EXECHEAP); |
| 2897 | } else if (!vma->vm_file && |
| 2898 | vma->vm_start <= vma->vm_mm->start_stack && |
| 2899 | vma->vm_end >= vma->vm_mm->start_stack) { |
| 2900 | rc = task_has_perm(current, current, PROCESS__EXECSTACK); |
| 2901 | } else if (vma->vm_file && vma->anon_vma) { |
| 2902 | /* |
| 2903 | * We are making executable a file mapping that has |
| 2904 | * had some COW done. Since pages might have been |
| 2905 | * written, check ability to execute the possibly |
| 2906 | * modified content. This typically should only |
| 2907 | * occur for text relocations. |
| 2908 | */ |
| 2909 | rc = file_has_perm(current, vma->vm_file, |
| 2910 | FILE__EXECMOD); |
| 2911 | } |
Lorenzo Hernandez GarcÃa-Hierro | 6b99219 | 2005-06-25 14:54:34 -0700 | [diff] [blame] | 2912 | if (rc) |
| 2913 | return rc; |
| 2914 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2915 | #endif |
| 2916 | |
| 2917 | return file_map_prot_check(vma->vm_file, prot, vma->vm_flags&VM_SHARED); |
| 2918 | } |
| 2919 | |
| 2920 | static int selinux_file_lock(struct file *file, unsigned int cmd) |
| 2921 | { |
| 2922 | return file_has_perm(current, file, FILE__LOCK); |
| 2923 | } |
| 2924 | |
| 2925 | static int selinux_file_fcntl(struct file *file, unsigned int cmd, |
| 2926 | unsigned long arg) |
| 2927 | { |
| 2928 | int err = 0; |
| 2929 | |
| 2930 | switch (cmd) { |
| 2931 | case F_SETFL: |
Josef Sipek | 3d5ff52 | 2006-12-08 02:37:38 -0800 | [diff] [blame] | 2932 | if (!file->f_path.dentry || !file->f_path.dentry->d_inode) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2933 | err = -EINVAL; |
| 2934 | break; |
| 2935 | } |
| 2936 | |
| 2937 | if ((file->f_flags & O_APPEND) && !(arg & O_APPEND)) { |
| 2938 | err = file_has_perm(current, file,FILE__WRITE); |
| 2939 | break; |
| 2940 | } |
| 2941 | /* fall through */ |
| 2942 | case F_SETOWN: |
| 2943 | case F_SETSIG: |
| 2944 | case F_GETFL: |
| 2945 | case F_GETOWN: |
| 2946 | case F_GETSIG: |
| 2947 | /* Just check FD__USE permission */ |
| 2948 | err = file_has_perm(current, file, 0); |
| 2949 | break; |
| 2950 | case F_GETLK: |
| 2951 | case F_SETLK: |
| 2952 | case F_SETLKW: |
| 2953 | #if BITS_PER_LONG == 32 |
| 2954 | case F_GETLK64: |
| 2955 | case F_SETLK64: |
| 2956 | case F_SETLKW64: |
| 2957 | #endif |
Josef Sipek | 3d5ff52 | 2006-12-08 02:37:38 -0800 | [diff] [blame] | 2958 | if (!file->f_path.dentry || !file->f_path.dentry->d_inode) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2959 | err = -EINVAL; |
| 2960 | break; |
| 2961 | } |
| 2962 | err = file_has_perm(current, file, FILE__LOCK); |
| 2963 | break; |
| 2964 | } |
| 2965 | |
| 2966 | return err; |
| 2967 | } |
| 2968 | |
| 2969 | static int selinux_file_set_fowner(struct file *file) |
| 2970 | { |
| 2971 | struct task_security_struct *tsec; |
| 2972 | struct file_security_struct *fsec; |
| 2973 | |
| 2974 | tsec = current->security; |
| 2975 | fsec = file->f_security; |
| 2976 | fsec->fown_sid = tsec->sid; |
| 2977 | |
| 2978 | return 0; |
| 2979 | } |
| 2980 | |
| 2981 | static int selinux_file_send_sigiotask(struct task_struct *tsk, |
| 2982 | struct fown_struct *fown, int signum) |
| 2983 | { |
| 2984 | struct file *file; |
| 2985 | u32 perm; |
| 2986 | struct task_security_struct *tsec; |
| 2987 | struct file_security_struct *fsec; |
| 2988 | |
| 2989 | /* struct fown_struct is never outside the context of a struct file */ |
Robert P. J. Day | b385a14 | 2007-02-10 01:46:25 -0800 | [diff] [blame] | 2990 | file = container_of(fown, struct file, f_owner); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2991 | |
| 2992 | tsec = tsk->security; |
| 2993 | fsec = file->f_security; |
| 2994 | |
| 2995 | if (!signum) |
| 2996 | perm = signal_to_av(SIGIO); /* as per send_sigio_to_task */ |
| 2997 | else |
| 2998 | perm = signal_to_av(signum); |
| 2999 | |
| 3000 | return avc_has_perm(fsec->fown_sid, tsec->sid, |
| 3001 | SECCLASS_PROCESS, perm, NULL); |
| 3002 | } |
| 3003 | |
| 3004 | static int selinux_file_receive(struct file *file) |
| 3005 | { |
| 3006 | return file_has_perm(current, file, file_to_av(file)); |
| 3007 | } |
| 3008 | |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 3009 | static int selinux_dentry_open(struct file *file) |
| 3010 | { |
| 3011 | struct file_security_struct *fsec; |
| 3012 | struct inode *inode; |
| 3013 | struct inode_security_struct *isec; |
| 3014 | inode = file->f_path.dentry->d_inode; |
| 3015 | fsec = file->f_security; |
| 3016 | isec = inode->i_security; |
| 3017 | /* |
| 3018 | * Save inode label and policy sequence number |
| 3019 | * at open-time so that selinux_file_permission |
| 3020 | * can determine whether revalidation is necessary. |
| 3021 | * Task label is already saved in the file security |
| 3022 | * struct as its SID. |
| 3023 | */ |
| 3024 | fsec->isid = isec->sid; |
| 3025 | fsec->pseqno = avc_policy_seqno(); |
| 3026 | /* |
| 3027 | * Since the inode label or policy seqno may have changed |
| 3028 | * between the selinux_inode_permission check and the saving |
| 3029 | * of state above, recheck that access is still permitted. |
| 3030 | * Otherwise, access might never be revalidated against the |
| 3031 | * new inode label or new policy. |
| 3032 | * This check is not redundant - do not remove. |
| 3033 | */ |
| 3034 | return inode_has_perm(current, inode, file_to_av(file), NULL); |
| 3035 | } |
| 3036 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3037 | /* task security operations */ |
| 3038 | |
| 3039 | static int selinux_task_create(unsigned long clone_flags) |
| 3040 | { |
| 3041 | int rc; |
| 3042 | |
| 3043 | rc = secondary_ops->task_create(clone_flags); |
| 3044 | if (rc) |
| 3045 | return rc; |
| 3046 | |
| 3047 | return task_has_perm(current, current, PROCESS__FORK); |
| 3048 | } |
| 3049 | |
| 3050 | static int selinux_task_alloc_security(struct task_struct *tsk) |
| 3051 | { |
| 3052 | struct task_security_struct *tsec1, *tsec2; |
| 3053 | int rc; |
| 3054 | |
| 3055 | tsec1 = current->security; |
| 3056 | |
| 3057 | rc = task_alloc_security(tsk); |
| 3058 | if (rc) |
| 3059 | return rc; |
| 3060 | tsec2 = tsk->security; |
| 3061 | |
| 3062 | tsec2->osid = tsec1->osid; |
| 3063 | tsec2->sid = tsec1->sid; |
| 3064 | |
Michael LeMay | 28eba5b | 2006-06-27 02:53:42 -0700 | [diff] [blame] | 3065 | /* Retain the exec, fs, key, and sock SIDs across fork */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3066 | tsec2->exec_sid = tsec1->exec_sid; |
| 3067 | tsec2->create_sid = tsec1->create_sid; |
Michael LeMay | 28eba5b | 2006-06-27 02:53:42 -0700 | [diff] [blame] | 3068 | tsec2->keycreate_sid = tsec1->keycreate_sid; |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 3069 | tsec2->sockcreate_sid = tsec1->sockcreate_sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3070 | |
| 3071 | /* Retain ptracer SID across fork, if any. |
| 3072 | This will be reset by the ptrace hook upon any |
| 3073 | subsequent ptrace_attach operations. */ |
| 3074 | tsec2->ptrace_sid = tsec1->ptrace_sid; |
| 3075 | |
| 3076 | return 0; |
| 3077 | } |
| 3078 | |
| 3079 | static void selinux_task_free_security(struct task_struct *tsk) |
| 3080 | { |
| 3081 | task_free_security(tsk); |
| 3082 | } |
| 3083 | |
| 3084 | static int selinux_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags) |
| 3085 | { |
| 3086 | /* Since setuid only affects the current process, and |
| 3087 | since the SELinux controls are not based on the Linux |
| 3088 | identity attributes, SELinux does not need to control |
| 3089 | this operation. However, SELinux does control the use |
| 3090 | of the CAP_SETUID and CAP_SETGID capabilities using the |
| 3091 | capable hook. */ |
| 3092 | return 0; |
| 3093 | } |
| 3094 | |
| 3095 | static int selinux_task_post_setuid(uid_t id0, uid_t id1, uid_t id2, int flags) |
| 3096 | { |
| 3097 | return secondary_ops->task_post_setuid(id0,id1,id2,flags); |
| 3098 | } |
| 3099 | |
| 3100 | static int selinux_task_setgid(gid_t id0, gid_t id1, gid_t id2, int flags) |
| 3101 | { |
| 3102 | /* See the comment for setuid above. */ |
| 3103 | return 0; |
| 3104 | } |
| 3105 | |
| 3106 | static int selinux_task_setpgid(struct task_struct *p, pid_t pgid) |
| 3107 | { |
| 3108 | return task_has_perm(current, p, PROCESS__SETPGID); |
| 3109 | } |
| 3110 | |
| 3111 | static int selinux_task_getpgid(struct task_struct *p) |
| 3112 | { |
| 3113 | return task_has_perm(current, p, PROCESS__GETPGID); |
| 3114 | } |
| 3115 | |
| 3116 | static int selinux_task_getsid(struct task_struct *p) |
| 3117 | { |
| 3118 | return task_has_perm(current, p, PROCESS__GETSESSION); |
| 3119 | } |
| 3120 | |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3121 | static void selinux_task_getsecid(struct task_struct *p, u32 *secid) |
| 3122 | { |
| 3123 | selinux_get_task_sid(p, secid); |
| 3124 | } |
| 3125 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3126 | static int selinux_task_setgroups(struct group_info *group_info) |
| 3127 | { |
| 3128 | /* See the comment for setuid above. */ |
| 3129 | return 0; |
| 3130 | } |
| 3131 | |
| 3132 | static int selinux_task_setnice(struct task_struct *p, int nice) |
| 3133 | { |
| 3134 | int rc; |
| 3135 | |
| 3136 | rc = secondary_ops->task_setnice(p, nice); |
| 3137 | if (rc) |
| 3138 | return rc; |
| 3139 | |
| 3140 | return task_has_perm(current,p, PROCESS__SETSCHED); |
| 3141 | } |
| 3142 | |
James Morris | 03e6806 | 2006-06-23 02:03:58 -0700 | [diff] [blame] | 3143 | static int selinux_task_setioprio(struct task_struct *p, int ioprio) |
| 3144 | { |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 3145 | int rc; |
| 3146 | |
| 3147 | rc = secondary_ops->task_setioprio(p, ioprio); |
| 3148 | if (rc) |
| 3149 | return rc; |
| 3150 | |
James Morris | 03e6806 | 2006-06-23 02:03:58 -0700 | [diff] [blame] | 3151 | return task_has_perm(current, p, PROCESS__SETSCHED); |
| 3152 | } |
| 3153 | |
David Quigley | a1836a4 | 2006-06-30 01:55:49 -0700 | [diff] [blame] | 3154 | static int selinux_task_getioprio(struct task_struct *p) |
| 3155 | { |
| 3156 | return task_has_perm(current, p, PROCESS__GETSCHED); |
| 3157 | } |
| 3158 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3159 | static int selinux_task_setrlimit(unsigned int resource, struct rlimit *new_rlim) |
| 3160 | { |
| 3161 | struct rlimit *old_rlim = current->signal->rlim + resource; |
| 3162 | int rc; |
| 3163 | |
| 3164 | rc = secondary_ops->task_setrlimit(resource, new_rlim); |
| 3165 | if (rc) |
| 3166 | return rc; |
| 3167 | |
| 3168 | /* Control the ability to change the hard limit (whether |
| 3169 | lowering or raising it), so that the hard limit can |
| 3170 | later be used as a safe reset point for the soft limit |
| 3171 | upon context transitions. See selinux_bprm_apply_creds. */ |
| 3172 | if (old_rlim->rlim_max != new_rlim->rlim_max) |
| 3173 | return task_has_perm(current, current, PROCESS__SETRLIMIT); |
| 3174 | |
| 3175 | return 0; |
| 3176 | } |
| 3177 | |
| 3178 | static int selinux_task_setscheduler(struct task_struct *p, int policy, struct sched_param *lp) |
| 3179 | { |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 3180 | int rc; |
| 3181 | |
| 3182 | rc = secondary_ops->task_setscheduler(p, policy, lp); |
| 3183 | if (rc) |
| 3184 | return rc; |
| 3185 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3186 | return task_has_perm(current, p, PROCESS__SETSCHED); |
| 3187 | } |
| 3188 | |
| 3189 | static int selinux_task_getscheduler(struct task_struct *p) |
| 3190 | { |
| 3191 | return task_has_perm(current, p, PROCESS__GETSCHED); |
| 3192 | } |
| 3193 | |
David Quigley | 3560154 | 2006-06-23 02:04:01 -0700 | [diff] [blame] | 3194 | static int selinux_task_movememory(struct task_struct *p) |
| 3195 | { |
| 3196 | return task_has_perm(current, p, PROCESS__SETSCHED); |
| 3197 | } |
| 3198 | |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3199 | static int selinux_task_kill(struct task_struct *p, struct siginfo *info, |
| 3200 | int sig, u32 secid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3201 | { |
| 3202 | u32 perm; |
| 3203 | int rc; |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3204 | struct task_security_struct *tsec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3205 | |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3206 | rc = secondary_ops->task_kill(p, info, sig, secid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3207 | if (rc) |
| 3208 | return rc; |
| 3209 | |
Oleg Nesterov | 621d312 | 2005-10-30 15:03:45 -0800 | [diff] [blame] | 3210 | if (info != SEND_SIG_NOINFO && (is_si_special(info) || SI_FROMKERNEL(info))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3211 | return 0; |
| 3212 | |
| 3213 | if (!sig) |
| 3214 | perm = PROCESS__SIGNULL; /* null signal; existence test */ |
| 3215 | else |
| 3216 | perm = signal_to_av(sig); |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3217 | tsec = p->security; |
| 3218 | if (secid) |
| 3219 | rc = avc_has_perm(secid, tsec->sid, SECCLASS_PROCESS, perm, NULL); |
| 3220 | else |
| 3221 | rc = task_has_perm(current, p, perm); |
| 3222 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3223 | } |
| 3224 | |
| 3225 | static int selinux_task_prctl(int option, |
| 3226 | unsigned long arg2, |
| 3227 | unsigned long arg3, |
| 3228 | unsigned long arg4, |
| 3229 | unsigned long arg5) |
| 3230 | { |
| 3231 | /* The current prctl operations do not appear to require |
| 3232 | any SELinux controls since they merely observe or modify |
| 3233 | the state of the current process. */ |
| 3234 | return 0; |
| 3235 | } |
| 3236 | |
| 3237 | static int selinux_task_wait(struct task_struct *p) |
| 3238 | { |
Eric Paris | 8a53514 | 2007-10-22 16:10:31 -0400 | [diff] [blame] | 3239 | return task_has_perm(p, current, PROCESS__SIGCHLD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3240 | } |
| 3241 | |
| 3242 | static void selinux_task_reparent_to_init(struct task_struct *p) |
| 3243 | { |
| 3244 | struct task_security_struct *tsec; |
| 3245 | |
| 3246 | secondary_ops->task_reparent_to_init(p); |
| 3247 | |
| 3248 | tsec = p->security; |
| 3249 | tsec->osid = tsec->sid; |
| 3250 | tsec->sid = SECINITSID_KERNEL; |
| 3251 | return; |
| 3252 | } |
| 3253 | |
| 3254 | static void selinux_task_to_inode(struct task_struct *p, |
| 3255 | struct inode *inode) |
| 3256 | { |
| 3257 | struct task_security_struct *tsec = p->security; |
| 3258 | struct inode_security_struct *isec = inode->i_security; |
| 3259 | |
| 3260 | isec->sid = tsec->sid; |
| 3261 | isec->initialized = 1; |
| 3262 | return; |
| 3263 | } |
| 3264 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3265 | /* Returns error only if unable to parse addresses */ |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3266 | static int selinux_parse_skb_ipv4(struct sk_buff *skb, |
| 3267 | struct avc_audit_data *ad, u8 *proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3268 | { |
| 3269 | int offset, ihlen, ret = -EINVAL; |
| 3270 | struct iphdr _iph, *ih; |
| 3271 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 3272 | offset = skb_network_offset(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3273 | ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph); |
| 3274 | if (ih == NULL) |
| 3275 | goto out; |
| 3276 | |
| 3277 | ihlen = ih->ihl * 4; |
| 3278 | if (ihlen < sizeof(_iph)) |
| 3279 | goto out; |
| 3280 | |
| 3281 | ad->u.net.v4info.saddr = ih->saddr; |
| 3282 | ad->u.net.v4info.daddr = ih->daddr; |
| 3283 | ret = 0; |
| 3284 | |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3285 | if (proto) |
| 3286 | *proto = ih->protocol; |
| 3287 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3288 | switch (ih->protocol) { |
| 3289 | case IPPROTO_TCP: { |
| 3290 | struct tcphdr _tcph, *th; |
| 3291 | |
| 3292 | if (ntohs(ih->frag_off) & IP_OFFSET) |
| 3293 | break; |
| 3294 | |
| 3295 | offset += ihlen; |
| 3296 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); |
| 3297 | if (th == NULL) |
| 3298 | break; |
| 3299 | |
| 3300 | ad->u.net.sport = th->source; |
| 3301 | ad->u.net.dport = th->dest; |
| 3302 | break; |
| 3303 | } |
| 3304 | |
| 3305 | case IPPROTO_UDP: { |
| 3306 | struct udphdr _udph, *uh; |
| 3307 | |
| 3308 | if (ntohs(ih->frag_off) & IP_OFFSET) |
| 3309 | break; |
| 3310 | |
| 3311 | offset += ihlen; |
| 3312 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); |
| 3313 | if (uh == NULL) |
| 3314 | break; |
| 3315 | |
| 3316 | ad->u.net.sport = uh->source; |
| 3317 | ad->u.net.dport = uh->dest; |
| 3318 | break; |
| 3319 | } |
| 3320 | |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3321 | case IPPROTO_DCCP: { |
| 3322 | struct dccp_hdr _dccph, *dh; |
| 3323 | |
| 3324 | if (ntohs(ih->frag_off) & IP_OFFSET) |
| 3325 | break; |
| 3326 | |
| 3327 | offset += ihlen; |
| 3328 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); |
| 3329 | if (dh == NULL) |
| 3330 | break; |
| 3331 | |
| 3332 | ad->u.net.sport = dh->dccph_sport; |
| 3333 | ad->u.net.dport = dh->dccph_dport; |
| 3334 | break; |
| 3335 | } |
| 3336 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3337 | default: |
| 3338 | break; |
| 3339 | } |
| 3340 | out: |
| 3341 | return ret; |
| 3342 | } |
| 3343 | |
| 3344 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 3345 | |
| 3346 | /* Returns error only if unable to parse addresses */ |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3347 | static int selinux_parse_skb_ipv6(struct sk_buff *skb, |
| 3348 | struct avc_audit_data *ad, u8 *proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3349 | { |
| 3350 | u8 nexthdr; |
| 3351 | int ret = -EINVAL, offset; |
| 3352 | struct ipv6hdr _ipv6h, *ip6; |
| 3353 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 3354 | offset = skb_network_offset(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3355 | ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h); |
| 3356 | if (ip6 == NULL) |
| 3357 | goto out; |
| 3358 | |
| 3359 | ipv6_addr_copy(&ad->u.net.v6info.saddr, &ip6->saddr); |
| 3360 | ipv6_addr_copy(&ad->u.net.v6info.daddr, &ip6->daddr); |
| 3361 | ret = 0; |
| 3362 | |
| 3363 | nexthdr = ip6->nexthdr; |
| 3364 | offset += sizeof(_ipv6h); |
Herbert Xu | 0d3d077 | 2005-04-24 20:16:19 -0700 | [diff] [blame] | 3365 | offset = ipv6_skip_exthdr(skb, offset, &nexthdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3366 | if (offset < 0) |
| 3367 | goto out; |
| 3368 | |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3369 | if (proto) |
| 3370 | *proto = nexthdr; |
| 3371 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3372 | switch (nexthdr) { |
| 3373 | case IPPROTO_TCP: { |
| 3374 | struct tcphdr _tcph, *th; |
| 3375 | |
| 3376 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); |
| 3377 | if (th == NULL) |
| 3378 | break; |
| 3379 | |
| 3380 | ad->u.net.sport = th->source; |
| 3381 | ad->u.net.dport = th->dest; |
| 3382 | break; |
| 3383 | } |
| 3384 | |
| 3385 | case IPPROTO_UDP: { |
| 3386 | struct udphdr _udph, *uh; |
| 3387 | |
| 3388 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); |
| 3389 | if (uh == NULL) |
| 3390 | break; |
| 3391 | |
| 3392 | ad->u.net.sport = uh->source; |
| 3393 | ad->u.net.dport = uh->dest; |
| 3394 | break; |
| 3395 | } |
| 3396 | |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3397 | case IPPROTO_DCCP: { |
| 3398 | struct dccp_hdr _dccph, *dh; |
| 3399 | |
| 3400 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); |
| 3401 | if (dh == NULL) |
| 3402 | break; |
| 3403 | |
| 3404 | ad->u.net.sport = dh->dccph_sport; |
| 3405 | ad->u.net.dport = dh->dccph_dport; |
| 3406 | break; |
| 3407 | } |
| 3408 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3409 | /* includes fragments */ |
| 3410 | default: |
| 3411 | break; |
| 3412 | } |
| 3413 | out: |
| 3414 | return ret; |
| 3415 | } |
| 3416 | |
| 3417 | #endif /* IPV6 */ |
| 3418 | |
| 3419 | 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] | 3420 | char **addrp, int src, u8 *proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3421 | { |
| 3422 | int ret = 0; |
| 3423 | |
| 3424 | switch (ad->u.net.family) { |
| 3425 | case PF_INET: |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3426 | ret = selinux_parse_skb_ipv4(skb, ad, proto); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3427 | if (ret || !addrp) |
| 3428 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3429 | *addrp = (char *)(src ? &ad->u.net.v4info.saddr : |
| 3430 | &ad->u.net.v4info.daddr); |
| 3431 | break; |
| 3432 | |
| 3433 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 3434 | case PF_INET6: |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3435 | ret = selinux_parse_skb_ipv6(skb, ad, proto); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3436 | if (ret || !addrp) |
| 3437 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3438 | *addrp = (char *)(src ? &ad->u.net.v6info.saddr : |
| 3439 | &ad->u.net.v6info.daddr); |
| 3440 | break; |
| 3441 | #endif /* IPV6 */ |
| 3442 | default: |
| 3443 | break; |
| 3444 | } |
| 3445 | |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 3446 | if (unlikely(ret)) |
| 3447 | printk(KERN_WARNING |
| 3448 | "SELinux: failure in selinux_parse_skb()," |
| 3449 | " unable to parse packet\n"); |
| 3450 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3451 | return ret; |
| 3452 | } |
| 3453 | |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3454 | /** |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3455 | * selinux_skb_peerlbl_sid - Determine the peer label of a packet |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3456 | * @skb: the packet |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 3457 | * @family: protocol family |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3458 | * @sid: the packet's peer label SID |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3459 | * |
| 3460 | * Description: |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3461 | * Check the various different forms of network peer labeling and determine |
| 3462 | * the peer label/SID for the packet; most of the magic actually occurs in |
| 3463 | * the security server function security_net_peersid_cmp(). The function |
| 3464 | * returns zero if the value in @sid is valid (although it may be SECSID_NULL) |
| 3465 | * or -EACCES if @sid is invalid due to inconsistencies with the different |
| 3466 | * peer labels. |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3467 | * |
| 3468 | */ |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3469 | 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] | 3470 | { |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 3471 | int err; |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3472 | u32 xfrm_sid; |
| 3473 | u32 nlbl_sid; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3474 | u32 nlbl_type; |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3475 | |
| 3476 | selinux_skb_xfrm_sid(skb, &xfrm_sid); |
Paul Moore | 5dbe1eb | 2008-01-29 08:44:18 -0500 | [diff] [blame] | 3477 | selinux_netlbl_skbuff_getsid(skb, family, &nlbl_type, &nlbl_sid); |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3478 | |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 3479 | err = security_net_peersid_resolve(nlbl_sid, nlbl_type, xfrm_sid, sid); |
| 3480 | if (unlikely(err)) { |
| 3481 | printk(KERN_WARNING |
| 3482 | "SELinux: failure in selinux_skb_peerlbl_sid()," |
| 3483 | " unable to determine packet's peer label\n"); |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3484 | return -EACCES; |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 3485 | } |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3486 | |
| 3487 | return 0; |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3488 | } |
| 3489 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3490 | /* socket security operations */ |
| 3491 | static int socket_has_perm(struct task_struct *task, struct socket *sock, |
| 3492 | u32 perms) |
| 3493 | { |
| 3494 | struct inode_security_struct *isec; |
| 3495 | struct task_security_struct *tsec; |
| 3496 | struct avc_audit_data ad; |
| 3497 | int err = 0; |
| 3498 | |
| 3499 | tsec = task->security; |
| 3500 | isec = SOCK_INODE(sock)->i_security; |
| 3501 | |
| 3502 | if (isec->sid == SECINITSID_KERNEL) |
| 3503 | goto out; |
| 3504 | |
| 3505 | AVC_AUDIT_DATA_INIT(&ad,NET); |
| 3506 | ad.u.net.sk = sock->sk; |
| 3507 | err = avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, &ad); |
| 3508 | |
| 3509 | out: |
| 3510 | return err; |
| 3511 | } |
| 3512 | |
| 3513 | static int selinux_socket_create(int family, int type, |
| 3514 | int protocol, int kern) |
| 3515 | { |
| 3516 | int err = 0; |
| 3517 | struct task_security_struct *tsec; |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 3518 | u32 newsid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3519 | |
| 3520 | if (kern) |
| 3521 | goto out; |
| 3522 | |
| 3523 | tsec = current->security; |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 3524 | newsid = tsec->sockcreate_sid ? : tsec->sid; |
| 3525 | err = avc_has_perm(tsec->sid, newsid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3526 | socket_type_to_security_class(family, type, |
| 3527 | protocol), SOCKET__CREATE, NULL); |
| 3528 | |
| 3529 | out: |
| 3530 | return err; |
| 3531 | } |
| 3532 | |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 3533 | static int selinux_socket_post_create(struct socket *sock, int family, |
| 3534 | int type, int protocol, int kern) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3535 | { |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 3536 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3537 | struct inode_security_struct *isec; |
| 3538 | struct task_security_struct *tsec; |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 3539 | struct sk_security_struct *sksec; |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 3540 | u32 newsid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3541 | |
| 3542 | isec = SOCK_INODE(sock)->i_security; |
| 3543 | |
| 3544 | tsec = current->security; |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 3545 | newsid = tsec->sockcreate_sid ? : tsec->sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3546 | isec->sclass = socket_type_to_security_class(family, type, protocol); |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 3547 | isec->sid = kern ? SECINITSID_KERNEL : newsid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3548 | isec->initialized = 1; |
| 3549 | |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 3550 | if (sock->sk) { |
| 3551 | sksec = sock->sk->sk_security; |
| 3552 | sksec->sid = isec->sid; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3553 | sksec->sclass = isec->sclass; |
Paul Moore | 9f2ad66 | 2006-11-17 17:38:53 -0500 | [diff] [blame] | 3554 | err = selinux_netlbl_socket_post_create(sock); |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 3555 | } |
| 3556 | |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 3557 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3558 | } |
| 3559 | |
| 3560 | /* Range of port numbers used to automatically bind. |
| 3561 | Need to determine whether we should perform a name_bind |
| 3562 | permission check between the socket and the port number. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3563 | |
| 3564 | static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen) |
| 3565 | { |
| 3566 | u16 family; |
| 3567 | int err; |
| 3568 | |
| 3569 | err = socket_has_perm(current, sock, SOCKET__BIND); |
| 3570 | if (err) |
| 3571 | goto out; |
| 3572 | |
| 3573 | /* |
| 3574 | * 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] | 3575 | * Multiple address binding for SCTP is not supported yet: we just |
| 3576 | * check the first address now. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3577 | */ |
| 3578 | family = sock->sk->sk_family; |
| 3579 | if (family == PF_INET || family == PF_INET6) { |
| 3580 | char *addrp; |
| 3581 | struct inode_security_struct *isec; |
| 3582 | struct task_security_struct *tsec; |
| 3583 | struct avc_audit_data ad; |
| 3584 | struct sockaddr_in *addr4 = NULL; |
| 3585 | struct sockaddr_in6 *addr6 = NULL; |
| 3586 | unsigned short snum; |
| 3587 | struct sock *sk = sock->sk; |
| 3588 | u32 sid, node_perm, addrlen; |
| 3589 | |
| 3590 | tsec = current->security; |
| 3591 | isec = SOCK_INODE(sock)->i_security; |
| 3592 | |
| 3593 | if (family == PF_INET) { |
| 3594 | addr4 = (struct sockaddr_in *)address; |
| 3595 | snum = ntohs(addr4->sin_port); |
| 3596 | addrlen = sizeof(addr4->sin_addr.s_addr); |
| 3597 | addrp = (char *)&addr4->sin_addr.s_addr; |
| 3598 | } else { |
| 3599 | addr6 = (struct sockaddr_in6 *)address; |
| 3600 | snum = ntohs(addr6->sin6_port); |
| 3601 | addrlen = sizeof(addr6->sin6_addr.s6_addr); |
| 3602 | addrp = (char *)&addr6->sin6_addr.s6_addr; |
| 3603 | } |
| 3604 | |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 3605 | if (snum) { |
| 3606 | int low, high; |
| 3607 | |
| 3608 | inet_get_local_port_range(&low, &high); |
| 3609 | |
| 3610 | if (snum < max(PROT_SOCK, low) || snum > high) { |
| 3611 | err = security_port_sid(sk->sk_family, |
| 3612 | sk->sk_type, |
| 3613 | sk->sk_protocol, snum, |
| 3614 | &sid); |
| 3615 | if (err) |
| 3616 | goto out; |
| 3617 | AVC_AUDIT_DATA_INIT(&ad,NET); |
| 3618 | ad.u.net.sport = htons(snum); |
| 3619 | ad.u.net.family = family; |
| 3620 | err = avc_has_perm(isec->sid, sid, |
| 3621 | isec->sclass, |
| 3622 | SOCKET__NAME_BIND, &ad); |
| 3623 | if (err) |
| 3624 | goto out; |
| 3625 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3626 | } |
| 3627 | |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 3628 | switch(isec->sclass) { |
| 3629 | case SECCLASS_TCP_SOCKET: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3630 | node_perm = TCP_SOCKET__NODE_BIND; |
| 3631 | break; |
| 3632 | |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 3633 | case SECCLASS_UDP_SOCKET: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3634 | node_perm = UDP_SOCKET__NODE_BIND; |
| 3635 | break; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3636 | |
| 3637 | case SECCLASS_DCCP_SOCKET: |
| 3638 | node_perm = DCCP_SOCKET__NODE_BIND; |
| 3639 | break; |
| 3640 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3641 | default: |
| 3642 | node_perm = RAWIP_SOCKET__NODE_BIND; |
| 3643 | break; |
| 3644 | } |
| 3645 | |
Paul Moore | 224dfbd | 2008-01-29 08:38:13 -0500 | [diff] [blame] | 3646 | err = sel_netnode_sid(addrp, family, &sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3647 | if (err) |
| 3648 | goto out; |
| 3649 | |
| 3650 | AVC_AUDIT_DATA_INIT(&ad,NET); |
| 3651 | ad.u.net.sport = htons(snum); |
| 3652 | ad.u.net.family = family; |
| 3653 | |
| 3654 | if (family == PF_INET) |
| 3655 | ad.u.net.v4info.saddr = addr4->sin_addr.s_addr; |
| 3656 | else |
| 3657 | ipv6_addr_copy(&ad.u.net.v6info.saddr, &addr6->sin6_addr); |
| 3658 | |
| 3659 | err = avc_has_perm(isec->sid, sid, |
| 3660 | isec->sclass, node_perm, &ad); |
| 3661 | if (err) |
| 3662 | goto out; |
| 3663 | } |
| 3664 | out: |
| 3665 | return err; |
| 3666 | } |
| 3667 | |
| 3668 | static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen) |
| 3669 | { |
| 3670 | struct inode_security_struct *isec; |
| 3671 | int err; |
| 3672 | |
| 3673 | err = socket_has_perm(current, sock, SOCKET__CONNECT); |
| 3674 | if (err) |
| 3675 | return err; |
| 3676 | |
| 3677 | /* |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3678 | * 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] | 3679 | */ |
| 3680 | isec = SOCK_INODE(sock)->i_security; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3681 | if (isec->sclass == SECCLASS_TCP_SOCKET || |
| 3682 | isec->sclass == SECCLASS_DCCP_SOCKET) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3683 | struct sock *sk = sock->sk; |
| 3684 | struct avc_audit_data ad; |
| 3685 | struct sockaddr_in *addr4 = NULL; |
| 3686 | struct sockaddr_in6 *addr6 = NULL; |
| 3687 | unsigned short snum; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3688 | u32 sid, perm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3689 | |
| 3690 | if (sk->sk_family == PF_INET) { |
| 3691 | addr4 = (struct sockaddr_in *)address; |
Stephen Smalley | 911656f | 2005-07-28 21:16:21 -0700 | [diff] [blame] | 3692 | if (addrlen < sizeof(struct sockaddr_in)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3693 | return -EINVAL; |
| 3694 | snum = ntohs(addr4->sin_port); |
| 3695 | } else { |
| 3696 | addr6 = (struct sockaddr_in6 *)address; |
Stephen Smalley | 911656f | 2005-07-28 21:16:21 -0700 | [diff] [blame] | 3697 | if (addrlen < SIN6_LEN_RFC2133) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3698 | return -EINVAL; |
| 3699 | snum = ntohs(addr6->sin6_port); |
| 3700 | } |
| 3701 | |
| 3702 | err = security_port_sid(sk->sk_family, sk->sk_type, |
| 3703 | sk->sk_protocol, snum, &sid); |
| 3704 | if (err) |
| 3705 | goto out; |
| 3706 | |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3707 | perm = (isec->sclass == SECCLASS_TCP_SOCKET) ? |
| 3708 | TCP_SOCKET__NAME_CONNECT : DCCP_SOCKET__NAME_CONNECT; |
| 3709 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3710 | AVC_AUDIT_DATA_INIT(&ad,NET); |
| 3711 | ad.u.net.dport = htons(snum); |
| 3712 | ad.u.net.family = sk->sk_family; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3713 | err = avc_has_perm(isec->sid, sid, isec->sclass, perm, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3714 | if (err) |
| 3715 | goto out; |
| 3716 | } |
| 3717 | |
| 3718 | out: |
| 3719 | return err; |
| 3720 | } |
| 3721 | |
| 3722 | static int selinux_socket_listen(struct socket *sock, int backlog) |
| 3723 | { |
| 3724 | return socket_has_perm(current, sock, SOCKET__LISTEN); |
| 3725 | } |
| 3726 | |
| 3727 | static int selinux_socket_accept(struct socket *sock, struct socket *newsock) |
| 3728 | { |
| 3729 | int err; |
| 3730 | struct inode_security_struct *isec; |
| 3731 | struct inode_security_struct *newisec; |
| 3732 | |
| 3733 | err = socket_has_perm(current, sock, SOCKET__ACCEPT); |
| 3734 | if (err) |
| 3735 | return err; |
| 3736 | |
| 3737 | newisec = SOCK_INODE(newsock)->i_security; |
| 3738 | |
| 3739 | isec = SOCK_INODE(sock)->i_security; |
| 3740 | newisec->sclass = isec->sclass; |
| 3741 | newisec->sid = isec->sid; |
| 3742 | newisec->initialized = 1; |
| 3743 | |
| 3744 | return 0; |
| 3745 | } |
| 3746 | |
| 3747 | static int selinux_socket_sendmsg(struct socket *sock, struct msghdr *msg, |
| 3748 | int size) |
| 3749 | { |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 3750 | int rc; |
| 3751 | |
| 3752 | rc = socket_has_perm(current, sock, SOCKET__WRITE); |
| 3753 | if (rc) |
| 3754 | return rc; |
| 3755 | |
| 3756 | return selinux_netlbl_inode_permission(SOCK_INODE(sock), MAY_WRITE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3757 | } |
| 3758 | |
| 3759 | static int selinux_socket_recvmsg(struct socket *sock, struct msghdr *msg, |
| 3760 | int size, int flags) |
| 3761 | { |
| 3762 | return socket_has_perm(current, sock, SOCKET__READ); |
| 3763 | } |
| 3764 | |
| 3765 | static int selinux_socket_getsockname(struct socket *sock) |
| 3766 | { |
| 3767 | return socket_has_perm(current, sock, SOCKET__GETATTR); |
| 3768 | } |
| 3769 | |
| 3770 | static int selinux_socket_getpeername(struct socket *sock) |
| 3771 | { |
| 3772 | return socket_has_perm(current, sock, SOCKET__GETATTR); |
| 3773 | } |
| 3774 | |
| 3775 | static int selinux_socket_setsockopt(struct socket *sock,int level,int optname) |
| 3776 | { |
Paul Moore | f8687af | 2006-10-30 15:22:15 -0800 | [diff] [blame] | 3777 | int err; |
| 3778 | |
| 3779 | err = socket_has_perm(current, sock, SOCKET__SETOPT); |
| 3780 | if (err) |
| 3781 | return err; |
| 3782 | |
| 3783 | return selinux_netlbl_socket_setsockopt(sock, level, optname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3784 | } |
| 3785 | |
| 3786 | static int selinux_socket_getsockopt(struct socket *sock, int level, |
| 3787 | int optname) |
| 3788 | { |
| 3789 | return socket_has_perm(current, sock, SOCKET__GETOPT); |
| 3790 | } |
| 3791 | |
| 3792 | static int selinux_socket_shutdown(struct socket *sock, int how) |
| 3793 | { |
| 3794 | return socket_has_perm(current, sock, SOCKET__SHUTDOWN); |
| 3795 | } |
| 3796 | |
| 3797 | static int selinux_socket_unix_stream_connect(struct socket *sock, |
| 3798 | struct socket *other, |
| 3799 | struct sock *newsk) |
| 3800 | { |
| 3801 | struct sk_security_struct *ssec; |
| 3802 | struct inode_security_struct *isec; |
| 3803 | struct inode_security_struct *other_isec; |
| 3804 | struct avc_audit_data ad; |
| 3805 | int err; |
| 3806 | |
| 3807 | err = secondary_ops->unix_stream_connect(sock, other, newsk); |
| 3808 | if (err) |
| 3809 | return err; |
| 3810 | |
| 3811 | isec = SOCK_INODE(sock)->i_security; |
| 3812 | other_isec = SOCK_INODE(other)->i_security; |
| 3813 | |
| 3814 | AVC_AUDIT_DATA_INIT(&ad,NET); |
| 3815 | ad.u.net.sk = other->sk; |
| 3816 | |
| 3817 | err = avc_has_perm(isec->sid, other_isec->sid, |
| 3818 | isec->sclass, |
| 3819 | UNIX_STREAM_SOCKET__CONNECTTO, &ad); |
| 3820 | if (err) |
| 3821 | return err; |
| 3822 | |
| 3823 | /* connecting socket */ |
| 3824 | ssec = sock->sk->sk_security; |
| 3825 | ssec->peer_sid = other_isec->sid; |
| 3826 | |
| 3827 | /* server child socket */ |
| 3828 | ssec = newsk->sk_security; |
| 3829 | ssec->peer_sid = isec->sid; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 3830 | err = security_sid_mls_copy(other_isec->sid, ssec->peer_sid, &ssec->sid); |
| 3831 | |
| 3832 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3833 | } |
| 3834 | |
| 3835 | static int selinux_socket_unix_may_send(struct socket *sock, |
| 3836 | struct socket *other) |
| 3837 | { |
| 3838 | struct inode_security_struct *isec; |
| 3839 | struct inode_security_struct *other_isec; |
| 3840 | struct avc_audit_data ad; |
| 3841 | int err; |
| 3842 | |
| 3843 | isec = SOCK_INODE(sock)->i_security; |
| 3844 | other_isec = SOCK_INODE(other)->i_security; |
| 3845 | |
| 3846 | AVC_AUDIT_DATA_INIT(&ad,NET); |
| 3847 | ad.u.net.sk = other->sk; |
| 3848 | |
| 3849 | err = avc_has_perm(isec->sid, other_isec->sid, |
| 3850 | isec->sclass, SOCKET__SENDTO, &ad); |
| 3851 | if (err) |
| 3852 | return err; |
| 3853 | |
| 3854 | return 0; |
| 3855 | } |
| 3856 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 3857 | static int selinux_inet_sys_rcv_skb(int ifindex, char *addrp, u16 family, |
| 3858 | u32 peer_sid, |
| 3859 | struct avc_audit_data *ad) |
| 3860 | { |
| 3861 | int err; |
| 3862 | u32 if_sid; |
| 3863 | u32 node_sid; |
| 3864 | |
| 3865 | err = sel_netif_sid(ifindex, &if_sid); |
| 3866 | if (err) |
| 3867 | return err; |
| 3868 | err = avc_has_perm(peer_sid, if_sid, |
| 3869 | SECCLASS_NETIF, NETIF__INGRESS, ad); |
| 3870 | if (err) |
| 3871 | return err; |
| 3872 | |
| 3873 | err = sel_netnode_sid(addrp, family, &node_sid); |
| 3874 | if (err) |
| 3875 | return err; |
| 3876 | return avc_has_perm(peer_sid, node_sid, |
| 3877 | SECCLASS_NODE, NODE__RECVFROM, ad); |
| 3878 | } |
| 3879 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3880 | static int selinux_sock_rcv_skb_iptables_compat(struct sock *sk, |
| 3881 | struct sk_buff *skb, |
| 3882 | struct avc_audit_data *ad, |
| 3883 | u16 family, |
| 3884 | char *addrp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3885 | { |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3886 | int err; |
| 3887 | struct sk_security_struct *sksec = sk->sk_security; |
| 3888 | u16 sk_class; |
| 3889 | u32 netif_perm, node_perm, recv_perm; |
| 3890 | u32 port_sid, node_sid, if_sid, sk_sid; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 3891 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3892 | sk_sid = sksec->sid; |
| 3893 | sk_class = sksec->sclass; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3894 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3895 | switch (sk_class) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3896 | case SECCLASS_UDP_SOCKET: |
| 3897 | netif_perm = NETIF__UDP_RECV; |
| 3898 | node_perm = NODE__UDP_RECV; |
| 3899 | recv_perm = UDP_SOCKET__RECV_MSG; |
| 3900 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3901 | case SECCLASS_TCP_SOCKET: |
| 3902 | netif_perm = NETIF__TCP_RECV; |
| 3903 | node_perm = NODE__TCP_RECV; |
| 3904 | recv_perm = TCP_SOCKET__RECV_MSG; |
| 3905 | break; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3906 | case SECCLASS_DCCP_SOCKET: |
| 3907 | netif_perm = NETIF__DCCP_RECV; |
| 3908 | node_perm = NODE__DCCP_RECV; |
| 3909 | recv_perm = DCCP_SOCKET__RECV_MSG; |
| 3910 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3911 | default: |
| 3912 | netif_perm = NETIF__RAWIP_RECV; |
| 3913 | node_perm = NODE__RAWIP_RECV; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3914 | recv_perm = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3915 | break; |
| 3916 | } |
| 3917 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3918 | err = sel_netif_sid(skb->iif, &if_sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3919 | if (err) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3920 | return err; |
| 3921 | err = avc_has_perm(sk_sid, if_sid, SECCLASS_NETIF, netif_perm, ad); |
| 3922 | if (err) |
| 3923 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3924 | |
Paul Moore | 224dfbd | 2008-01-29 08:38:13 -0500 | [diff] [blame] | 3925 | err = sel_netnode_sid(addrp, family, &node_sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3926 | if (err) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3927 | return err; |
| 3928 | 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] | 3929 | if (err) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3930 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3931 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3932 | if (!recv_perm) |
| 3933 | return 0; |
| 3934 | err = security_port_sid(sk->sk_family, sk->sk_type, |
| 3935 | sk->sk_protocol, ntohs(ad->u.net.sport), |
| 3936 | &port_sid); |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 3937 | if (unlikely(err)) { |
| 3938 | printk(KERN_WARNING |
| 3939 | "SELinux: failure in" |
| 3940 | " selinux_sock_rcv_skb_iptables_compat()," |
| 3941 | " network port label not found\n"); |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3942 | return err; |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 3943 | } |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3944 | return avc_has_perm(sk_sid, port_sid, sk_class, recv_perm, ad); |
| 3945 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3946 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3947 | static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb, |
| 3948 | struct avc_audit_data *ad, |
| 3949 | u16 family, char *addrp) |
| 3950 | { |
| 3951 | int err; |
| 3952 | struct sk_security_struct *sksec = sk->sk_security; |
| 3953 | u32 peer_sid; |
| 3954 | u32 sk_sid = sksec->sid; |
| 3955 | |
| 3956 | if (selinux_compat_net) |
| 3957 | err = selinux_sock_rcv_skb_iptables_compat(sk, skb, ad, |
| 3958 | family, addrp); |
| 3959 | else |
| 3960 | err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET, |
| 3961 | PACKET__RECV, ad); |
| 3962 | if (err) |
| 3963 | return err; |
| 3964 | |
| 3965 | if (selinux_policycap_netpeer) { |
| 3966 | err = selinux_skb_peerlbl_sid(skb, family, &peer_sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3967 | if (err) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3968 | return err; |
| 3969 | err = avc_has_perm(sk_sid, peer_sid, |
| 3970 | SECCLASS_PEER, PEER__RECV, ad); |
| 3971 | } else { |
| 3972 | err = selinux_netlbl_sock_rcv_skb(sksec, skb, family, ad); |
| 3973 | if (err) |
| 3974 | return err; |
| 3975 | err = selinux_xfrm_sock_rcv_skb(sksec->sid, skb, ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3976 | } |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 3977 | |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 3978 | return err; |
| 3979 | } |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 3980 | |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 3981 | static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) |
| 3982 | { |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3983 | int err; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 3984 | struct sk_security_struct *sksec = sk->sk_security; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3985 | u16 family = sk->sk_family; |
| 3986 | u32 sk_sid = sksec->sid; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3987 | struct avc_audit_data ad; |
| 3988 | char *addrp; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 3989 | |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 3990 | if (family != PF_INET && family != PF_INET6) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3991 | return 0; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 3992 | |
| 3993 | /* Handle mapped IPv4 packets arriving via IPv6 sockets */ |
Al Viro | 87fcd70 | 2006-12-04 22:00:55 +0000 | [diff] [blame] | 3994 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 3995 | family = PF_INET; |
| 3996 | |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 3997 | AVC_AUDIT_DATA_INIT(&ad, NET); |
Paul Moore | da5645a | 2008-01-29 08:38:10 -0500 | [diff] [blame] | 3998 | ad.u.net.netif = skb->iif; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 3999 | ad.u.net.family = family; |
Paul Moore | 224dfbd | 2008-01-29 08:38:13 -0500 | [diff] [blame] | 4000 | err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL); |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4001 | if (err) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4002 | return err; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4003 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4004 | /* If any sort of compatibility mode is enabled then handoff processing |
| 4005 | * to the selinux_sock_rcv_skb_compat() function to deal with the |
| 4006 | * special handling. We do this in an attempt to keep this function |
| 4007 | * as fast and as clean as possible. */ |
| 4008 | if (selinux_compat_net || !selinux_policycap_netpeer) |
| 4009 | return selinux_sock_rcv_skb_compat(sk, skb, &ad, |
| 4010 | family, addrp); |
| 4011 | |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 4012 | if (netlbl_enabled() || selinux_xfrm_enabled()) { |
| 4013 | u32 peer_sid; |
| 4014 | |
| 4015 | err = selinux_skb_peerlbl_sid(skb, family, &peer_sid); |
| 4016 | if (err) |
| 4017 | return err; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4018 | err = selinux_inet_sys_rcv_skb(skb->iif, addrp, family, |
| 4019 | peer_sid, &ad); |
| 4020 | if (err) |
| 4021 | return err; |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 4022 | err = avc_has_perm(sk_sid, peer_sid, SECCLASS_PEER, |
| 4023 | PEER__RECV, &ad); |
| 4024 | } |
| 4025 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4026 | if (selinux_secmark_enabled()) { |
| 4027 | err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET, |
| 4028 | PACKET__RECV, &ad); |
| 4029 | if (err) |
| 4030 | return err; |
| 4031 | } |
| 4032 | |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 4033 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4034 | } |
| 4035 | |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4036 | static int selinux_socket_getpeersec_stream(struct socket *sock, char __user *optval, |
| 4037 | int __user *optlen, unsigned len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4038 | { |
| 4039 | int err = 0; |
| 4040 | char *scontext; |
| 4041 | u32 scontext_len; |
| 4042 | struct sk_security_struct *ssec; |
| 4043 | struct inode_security_struct *isec; |
Paul Moore | 3de4bab | 2006-11-17 17:38:54 -0500 | [diff] [blame] | 4044 | u32 peer_sid = SECSID_NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4045 | |
| 4046 | isec = SOCK_INODE(sock)->i_security; |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4047 | |
Paul Moore | 3de4bab | 2006-11-17 17:38:54 -0500 | [diff] [blame] | 4048 | if (isec->sclass == SECCLASS_UNIX_STREAM_SOCKET || |
| 4049 | isec->sclass == SECCLASS_TCP_SOCKET) { |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4050 | ssec = sock->sk->sk_security; |
| 4051 | peer_sid = ssec->peer_sid; |
| 4052 | } |
Paul Moore | 3de4bab | 2006-11-17 17:38:54 -0500 | [diff] [blame] | 4053 | if (peer_sid == SECSID_NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4054 | err = -ENOPROTOOPT; |
| 4055 | goto out; |
| 4056 | } |
| 4057 | |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4058 | err = security_sid_to_context(peer_sid, &scontext, &scontext_len); |
| 4059 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4060 | if (err) |
| 4061 | goto out; |
| 4062 | |
| 4063 | if (scontext_len > len) { |
| 4064 | err = -ERANGE; |
| 4065 | goto out_len; |
| 4066 | } |
| 4067 | |
| 4068 | if (copy_to_user(optval, scontext, scontext_len)) |
| 4069 | err = -EFAULT; |
| 4070 | |
| 4071 | out_len: |
| 4072 | if (put_user(scontext_len, optlen)) |
| 4073 | err = -EFAULT; |
| 4074 | |
| 4075 | kfree(scontext); |
| 4076 | out: |
| 4077 | return err; |
| 4078 | } |
| 4079 | |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 4080 | 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] | 4081 | { |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 4082 | u32 peer_secid = SECSID_NULL; |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4083 | u16 family; |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 4084 | |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4085 | if (sock) |
| 4086 | family = sock->sk->sk_family; |
| 4087 | else if (skb && skb->sk) |
| 4088 | family = skb->sk->sk_family; |
| 4089 | else |
| 4090 | goto out; |
| 4091 | |
| 4092 | if (sock && family == PF_UNIX) |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 4093 | selinux_get_inode_sid(SOCK_INODE(sock), &peer_secid); |
Paul Moore | 3de4bab | 2006-11-17 17:38:54 -0500 | [diff] [blame] | 4094 | else if (skb) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4095 | selinux_skb_peerlbl_sid(skb, family, &peer_secid); |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4096 | |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4097 | out: |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 4098 | *secid = peer_secid; |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4099 | if (peer_secid == SECSID_NULL) |
| 4100 | return -EINVAL; |
| 4101 | return 0; |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4102 | } |
| 4103 | |
Al Viro | 7d877f3 | 2005-10-21 03:20:43 -0400 | [diff] [blame] | 4104 | 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] | 4105 | { |
| 4106 | return sk_alloc_security(sk, family, priority); |
| 4107 | } |
| 4108 | |
| 4109 | static void selinux_sk_free_security(struct sock *sk) |
| 4110 | { |
| 4111 | sk_free_security(sk); |
| 4112 | } |
| 4113 | |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4114 | static void selinux_sk_clone_security(const struct sock *sk, struct sock *newsk) |
| 4115 | { |
| 4116 | struct sk_security_struct *ssec = sk->sk_security; |
| 4117 | struct sk_security_struct *newssec = newsk->sk_security; |
| 4118 | |
| 4119 | newssec->sid = ssec->sid; |
| 4120 | newssec->peer_sid = ssec->peer_sid; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4121 | newssec->sclass = ssec->sclass; |
Paul Moore | 99f59ed | 2006-08-29 17:53:48 -0700 | [diff] [blame] | 4122 | |
Paul Moore | 9f2ad66 | 2006-11-17 17:38:53 -0500 | [diff] [blame] | 4123 | selinux_netlbl_sk_security_clone(ssec, newssec); |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4124 | } |
| 4125 | |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 4126 | static void selinux_sk_getsecid(struct sock *sk, u32 *secid) |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4127 | { |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4128 | if (!sk) |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 4129 | *secid = SECINITSID_ANY_SOCKET; |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4130 | else { |
| 4131 | struct sk_security_struct *sksec = sk->sk_security; |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4132 | |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 4133 | *secid = sksec->sid; |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4134 | } |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4135 | } |
| 4136 | |
Adrian Bunk | 9a673e5 | 2006-08-15 00:03:53 -0700 | [diff] [blame] | 4137 | static void selinux_sock_graft(struct sock* sk, struct socket *parent) |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4138 | { |
| 4139 | struct inode_security_struct *isec = SOCK_INODE(parent)->i_security; |
| 4140 | struct sk_security_struct *sksec = sk->sk_security; |
| 4141 | |
David Woodhouse | 2148ccc | 2006-09-29 15:50:25 -0700 | [diff] [blame] | 4142 | if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6 || |
| 4143 | sk->sk_family == PF_UNIX) |
| 4144 | isec->sid = sksec->sid; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4145 | sksec->sclass = isec->sclass; |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 4146 | |
| 4147 | selinux_netlbl_sock_graft(sk, parent); |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4148 | } |
| 4149 | |
Adrian Bunk | 9a673e5 | 2006-08-15 00:03:53 -0700 | [diff] [blame] | 4150 | static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb, |
| 4151 | struct request_sock *req) |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4152 | { |
| 4153 | struct sk_security_struct *sksec = sk->sk_security; |
| 4154 | int err; |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 4155 | u32 newsid; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4156 | u32 peersid; |
| 4157 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4158 | err = selinux_skb_peerlbl_sid(skb, sk->sk_family, &peersid); |
| 4159 | if (err) |
| 4160 | return err; |
Venkat Yekkirala | a51c64f | 2006-07-27 22:01:34 -0700 | [diff] [blame] | 4161 | if (peersid == SECSID_NULL) { |
| 4162 | req->secid = sksec->sid; |
Paul Moore | 3de4bab | 2006-11-17 17:38:54 -0500 | [diff] [blame] | 4163 | req->peer_secid = SECSID_NULL; |
Venkat Yekkirala | a51c64f | 2006-07-27 22:01:34 -0700 | [diff] [blame] | 4164 | return 0; |
| 4165 | } |
| 4166 | |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4167 | err = security_sid_mls_copy(sksec->sid, peersid, &newsid); |
| 4168 | if (err) |
| 4169 | return err; |
| 4170 | |
| 4171 | req->secid = newsid; |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 4172 | req->peer_secid = peersid; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4173 | return 0; |
| 4174 | } |
| 4175 | |
Adrian Bunk | 9a673e5 | 2006-08-15 00:03:53 -0700 | [diff] [blame] | 4176 | static void selinux_inet_csk_clone(struct sock *newsk, |
| 4177 | const struct request_sock *req) |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4178 | { |
| 4179 | struct sk_security_struct *newsksec = newsk->sk_security; |
| 4180 | |
| 4181 | newsksec->sid = req->secid; |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 4182 | newsksec->peer_sid = req->peer_secid; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4183 | /* NOTE: Ideally, we should also get the isec->sid for the |
| 4184 | new socket in sync, but we don't have the isec available yet. |
| 4185 | So we will wait until sock_graft to do it, by which |
| 4186 | time it will have been created and available. */ |
Paul Moore | 99f59ed | 2006-08-29 17:53:48 -0700 | [diff] [blame] | 4187 | |
Paul Moore | 9f2ad66 | 2006-11-17 17:38:53 -0500 | [diff] [blame] | 4188 | /* We don't need to take any sort of lock here as we are the only |
| 4189 | * thread with access to newsksec */ |
| 4190 | selinux_netlbl_sk_security_reset(newsksec, req->rsk_ops->family); |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4191 | } |
| 4192 | |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 4193 | static void selinux_inet_conn_established(struct sock *sk, |
| 4194 | struct sk_buff *skb) |
| 4195 | { |
| 4196 | struct sk_security_struct *sksec = sk->sk_security; |
| 4197 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4198 | selinux_skb_peerlbl_sid(skb, sk->sk_family, &sksec->peer_sid); |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 4199 | } |
| 4200 | |
Adrian Bunk | 9a673e5 | 2006-08-15 00:03:53 -0700 | [diff] [blame] | 4201 | static void selinux_req_classify_flow(const struct request_sock *req, |
| 4202 | struct flowi *fl) |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4203 | { |
| 4204 | fl->secid = req->secid; |
| 4205 | } |
| 4206 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4207 | static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb) |
| 4208 | { |
| 4209 | int err = 0; |
| 4210 | u32 perm; |
| 4211 | struct nlmsghdr *nlh; |
| 4212 | struct socket *sock = sk->sk_socket; |
| 4213 | struct inode_security_struct *isec = SOCK_INODE(sock)->i_security; |
| 4214 | |
| 4215 | if (skb->len < NLMSG_SPACE(0)) { |
| 4216 | err = -EINVAL; |
| 4217 | goto out; |
| 4218 | } |
Arnaldo Carvalho de Melo | b529ccf | 2007-04-25 19:08:35 -0700 | [diff] [blame] | 4219 | nlh = nlmsg_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4220 | |
| 4221 | err = selinux_nlmsg_lookup(isec->sclass, nlh->nlmsg_type, &perm); |
| 4222 | if (err) { |
| 4223 | if (err == -EINVAL) { |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 4224 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_SELINUX_ERR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4225 | "SELinux: unrecognized netlink message" |
| 4226 | " type=%hu for sclass=%hu\n", |
| 4227 | nlh->nlmsg_type, isec->sclass); |
| 4228 | if (!selinux_enforcing) |
| 4229 | err = 0; |
| 4230 | } |
| 4231 | |
| 4232 | /* Ignore */ |
| 4233 | if (err == -ENOENT) |
| 4234 | err = 0; |
| 4235 | goto out; |
| 4236 | } |
| 4237 | |
| 4238 | err = socket_has_perm(current, sock, perm); |
| 4239 | out: |
| 4240 | return err; |
| 4241 | } |
| 4242 | |
| 4243 | #ifdef CONFIG_NETFILTER |
| 4244 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4245 | static unsigned int selinux_ip_forward(struct sk_buff *skb, int ifindex, |
| 4246 | u16 family) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4247 | { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4248 | char *addrp; |
| 4249 | u32 peer_sid; |
| 4250 | struct avc_audit_data ad; |
| 4251 | u8 secmark_active; |
| 4252 | u8 peerlbl_active; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4253 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4254 | if (!selinux_policycap_netpeer) |
| 4255 | return NF_ACCEPT; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4256 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4257 | secmark_active = selinux_secmark_enabled(); |
| 4258 | peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled(); |
| 4259 | if (!secmark_active && !peerlbl_active) |
| 4260 | return NF_ACCEPT; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4261 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4262 | AVC_AUDIT_DATA_INIT(&ad, NET); |
| 4263 | ad.u.net.netif = ifindex; |
| 4264 | ad.u.net.family = family; |
| 4265 | if (selinux_parse_skb(skb, &ad, &addrp, 1, NULL) != 0) |
| 4266 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4267 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4268 | if (selinux_skb_peerlbl_sid(skb, family, &peer_sid) != 0) |
| 4269 | return NF_DROP; |
| 4270 | |
| 4271 | if (peerlbl_active) |
| 4272 | if (selinux_inet_sys_rcv_skb(ifindex, addrp, family, |
| 4273 | peer_sid, &ad) != 0) |
| 4274 | return NF_DROP; |
| 4275 | |
| 4276 | if (secmark_active) |
| 4277 | if (avc_has_perm(peer_sid, skb->secmark, |
| 4278 | SECCLASS_PACKET, PACKET__FORWARD_IN, &ad)) |
| 4279 | return NF_DROP; |
| 4280 | |
| 4281 | return NF_ACCEPT; |
| 4282 | } |
| 4283 | |
| 4284 | static unsigned int selinux_ipv4_forward(unsigned int hooknum, |
| 4285 | struct sk_buff *skb, |
| 4286 | const struct net_device *in, |
| 4287 | const struct net_device *out, |
| 4288 | int (*okfn)(struct sk_buff *)) |
| 4289 | { |
| 4290 | return selinux_ip_forward(skb, in->ifindex, PF_INET); |
| 4291 | } |
| 4292 | |
| 4293 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 4294 | static unsigned int selinux_ipv6_forward(unsigned int hooknum, |
| 4295 | struct sk_buff *skb, |
| 4296 | const struct net_device *in, |
| 4297 | const struct net_device *out, |
| 4298 | int (*okfn)(struct sk_buff *)) |
| 4299 | { |
| 4300 | return selinux_ip_forward(skb, in->ifindex, PF_INET6); |
| 4301 | } |
| 4302 | #endif /* IPV6 */ |
| 4303 | |
| 4304 | static int selinux_ip_postroute_iptables_compat(struct sock *sk, |
| 4305 | int ifindex, |
| 4306 | struct avc_audit_data *ad, |
| 4307 | u16 family, char *addrp) |
| 4308 | { |
| 4309 | int err; |
| 4310 | struct sk_security_struct *sksec = sk->sk_security; |
| 4311 | u16 sk_class; |
| 4312 | u32 netif_perm, node_perm, send_perm; |
| 4313 | u32 port_sid, node_sid, if_sid, sk_sid; |
| 4314 | |
| 4315 | sk_sid = sksec->sid; |
| 4316 | sk_class = sksec->sclass; |
| 4317 | |
| 4318 | switch (sk_class) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4319 | case SECCLASS_UDP_SOCKET: |
| 4320 | netif_perm = NETIF__UDP_SEND; |
| 4321 | node_perm = NODE__UDP_SEND; |
| 4322 | send_perm = UDP_SOCKET__SEND_MSG; |
| 4323 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4324 | case SECCLASS_TCP_SOCKET: |
| 4325 | netif_perm = NETIF__TCP_SEND; |
| 4326 | node_perm = NODE__TCP_SEND; |
| 4327 | send_perm = TCP_SOCKET__SEND_MSG; |
| 4328 | break; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 4329 | case SECCLASS_DCCP_SOCKET: |
| 4330 | netif_perm = NETIF__DCCP_SEND; |
| 4331 | node_perm = NODE__DCCP_SEND; |
| 4332 | send_perm = DCCP_SOCKET__SEND_MSG; |
| 4333 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4334 | default: |
| 4335 | netif_perm = NETIF__RAWIP_SEND; |
| 4336 | node_perm = NODE__RAWIP_SEND; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4337 | send_perm = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4338 | break; |
| 4339 | } |
| 4340 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4341 | err = sel_netif_sid(ifindex, &if_sid); |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4342 | if (err) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4343 | return err; |
| 4344 | err = avc_has_perm(sk_sid, if_sid, SECCLASS_NETIF, netif_perm, ad); |
| 4345 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4346 | |
Paul Moore | 224dfbd | 2008-01-29 08:38:13 -0500 | [diff] [blame] | 4347 | err = sel_netnode_sid(addrp, family, &node_sid); |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4348 | if (err) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4349 | return err; |
| 4350 | 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] | 4351 | if (err) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4352 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4353 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4354 | if (send_perm != 0) |
| 4355 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4356 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4357 | err = security_port_sid(sk->sk_family, sk->sk_type, |
| 4358 | sk->sk_protocol, ntohs(ad->u.net.dport), |
| 4359 | &port_sid); |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 4360 | if (unlikely(err)) { |
| 4361 | printk(KERN_WARNING |
| 4362 | "SELinux: failure in" |
| 4363 | " selinux_ip_postroute_iptables_compat()," |
| 4364 | " network port label not found\n"); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4365 | return err; |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 4366 | } |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4367 | 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] | 4368 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4369 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4370 | static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb, |
| 4371 | int ifindex, |
| 4372 | struct avc_audit_data *ad, |
| 4373 | u16 family, |
| 4374 | char *addrp, |
| 4375 | u8 proto) |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4376 | { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4377 | struct sock *sk = skb->sk; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4378 | struct sk_security_struct *sksec; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4379 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4380 | if (sk == NULL) |
| 4381 | return NF_ACCEPT; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4382 | sksec = sk->sk_security; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4383 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4384 | if (selinux_compat_net) { |
| 4385 | if (selinux_ip_postroute_iptables_compat(skb->sk, ifindex, |
| 4386 | ad, family, addrp)) |
| 4387 | return NF_DROP; |
| 4388 | } else { |
| 4389 | if (avc_has_perm(sksec->sid, skb->secmark, |
| 4390 | SECCLASS_PACKET, PACKET__SEND, ad)) |
| 4391 | return NF_DROP; |
| 4392 | } |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4393 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4394 | if (selinux_policycap_netpeer) |
| 4395 | if (selinux_xfrm_postroute_last(sksec->sid, skb, ad, proto)) |
| 4396 | return NF_DROP; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4397 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4398 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4399 | } |
| 4400 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4401 | static unsigned int selinux_ip_postroute(struct sk_buff *skb, int ifindex, |
| 4402 | u16 family) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4403 | { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4404 | u32 secmark_perm; |
| 4405 | u32 peer_sid; |
| 4406 | struct sock *sk; |
| 4407 | struct avc_audit_data ad; |
| 4408 | char *addrp; |
| 4409 | u8 proto; |
| 4410 | u8 secmark_active; |
| 4411 | u8 peerlbl_active; |
| 4412 | |
| 4413 | AVC_AUDIT_DATA_INIT(&ad, NET); |
| 4414 | ad.u.net.netif = ifindex; |
| 4415 | ad.u.net.family = family; |
| 4416 | if (selinux_parse_skb(skb, &ad, &addrp, 0, &proto)) |
| 4417 | return NF_DROP; |
| 4418 | |
| 4419 | /* If any sort of compatibility mode is enabled then handoff processing |
| 4420 | * to the selinux_ip_postroute_compat() function to deal with the |
| 4421 | * special handling. We do this in an attempt to keep this function |
| 4422 | * as fast and as clean as possible. */ |
| 4423 | if (selinux_compat_net || !selinux_policycap_netpeer) |
| 4424 | return selinux_ip_postroute_compat(skb, ifindex, &ad, |
| 4425 | family, addrp, proto); |
| 4426 | |
| 4427 | /* If skb->dst->xfrm is non-NULL then the packet is undergoing an IPsec |
| 4428 | * packet transformation so allow the packet to pass without any checks |
| 4429 | * since we'll have another chance to perform access control checks |
| 4430 | * when the packet is on it's final way out. |
| 4431 | * NOTE: there appear to be some IPv6 multicast cases where skb->dst |
| 4432 | * is NULL, in this case go ahead and apply access control. */ |
| 4433 | if (skb->dst != NULL && skb->dst->xfrm != NULL) |
| 4434 | return NF_ACCEPT; |
| 4435 | |
| 4436 | secmark_active = selinux_secmark_enabled(); |
| 4437 | peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled(); |
| 4438 | if (!secmark_active && !peerlbl_active) |
| 4439 | return NF_ACCEPT; |
| 4440 | |
| 4441 | /* if the packet is locally generated (skb->sk != NULL) then use the |
| 4442 | * socket's label as the peer label, otherwise the packet is being |
| 4443 | * forwarded through this system and we need to fetch the peer label |
| 4444 | * directly from the packet */ |
| 4445 | sk = skb->sk; |
| 4446 | if (sk) { |
| 4447 | struct sk_security_struct *sksec = sk->sk_security; |
| 4448 | peer_sid = sksec->sid; |
| 4449 | secmark_perm = PACKET__SEND; |
| 4450 | } else { |
| 4451 | if (selinux_skb_peerlbl_sid(skb, family, &peer_sid)) |
| 4452 | return NF_DROP; |
| 4453 | secmark_perm = PACKET__FORWARD_OUT; |
| 4454 | } |
| 4455 | |
| 4456 | if (secmark_active) |
| 4457 | if (avc_has_perm(peer_sid, skb->secmark, |
| 4458 | SECCLASS_PACKET, secmark_perm, &ad)) |
| 4459 | return NF_DROP; |
| 4460 | |
| 4461 | if (peerlbl_active) { |
| 4462 | u32 if_sid; |
| 4463 | u32 node_sid; |
| 4464 | |
| 4465 | if (sel_netif_sid(ifindex, &if_sid)) |
| 4466 | return NF_DROP; |
| 4467 | if (avc_has_perm(peer_sid, if_sid, |
| 4468 | SECCLASS_NETIF, NETIF__EGRESS, &ad)) |
| 4469 | return NF_DROP; |
| 4470 | |
| 4471 | if (sel_netnode_sid(addrp, family, &node_sid)) |
| 4472 | return NF_DROP; |
| 4473 | if (avc_has_perm(peer_sid, node_sid, |
| 4474 | SECCLASS_NODE, NODE__SENDTO, &ad)) |
| 4475 | return NF_DROP; |
| 4476 | } |
| 4477 | |
| 4478 | return NF_ACCEPT; |
| 4479 | } |
| 4480 | |
| 4481 | static unsigned int selinux_ipv4_postroute(unsigned int hooknum, |
| 4482 | struct sk_buff *skb, |
| 4483 | const struct net_device *in, |
| 4484 | const struct net_device *out, |
| 4485 | int (*okfn)(struct sk_buff *)) |
| 4486 | { |
| 4487 | return selinux_ip_postroute(skb, out->ifindex, PF_INET); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4488 | } |
| 4489 | |
| 4490 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4491 | static unsigned int selinux_ipv6_postroute(unsigned int hooknum, |
| 4492 | struct sk_buff *skb, |
| 4493 | const struct net_device *in, |
| 4494 | const struct net_device *out, |
| 4495 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4496 | { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4497 | return selinux_ip_postroute(skb, out->ifindex, PF_INET6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4498 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4499 | #endif /* IPV6 */ |
| 4500 | |
| 4501 | #endif /* CONFIG_NETFILTER */ |
| 4502 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4503 | static int selinux_netlink_send(struct sock *sk, struct sk_buff *skb) |
| 4504 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4505 | int err; |
| 4506 | |
| 4507 | err = secondary_ops->netlink_send(sk, skb); |
| 4508 | if (err) |
| 4509 | return err; |
| 4510 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4511 | if (policydb_loaded_version >= POLICYDB_VERSION_NLCLASS) |
| 4512 | err = selinux_nlmsg_perm(sk, skb); |
| 4513 | |
| 4514 | return err; |
| 4515 | } |
| 4516 | |
Darrel Goeddel | c7bdb54 | 2006-06-27 13:26:11 -0700 | [diff] [blame] | 4517 | static int selinux_netlink_recv(struct sk_buff *skb, int capability) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4518 | { |
Darrel Goeddel | c7bdb54 | 2006-06-27 13:26:11 -0700 | [diff] [blame] | 4519 | int err; |
| 4520 | struct avc_audit_data ad; |
| 4521 | |
| 4522 | err = secondary_ops->netlink_recv(skb, capability); |
| 4523 | if (err) |
| 4524 | return err; |
| 4525 | |
| 4526 | AVC_AUDIT_DATA_INIT(&ad, CAP); |
| 4527 | ad.u.cap = capability; |
| 4528 | |
| 4529 | return avc_has_perm(NETLINK_CB(skb).sid, NETLINK_CB(skb).sid, |
| 4530 | SECCLASS_CAPABILITY, CAP_TO_MASK(capability), &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4531 | } |
| 4532 | |
| 4533 | static int ipc_alloc_security(struct task_struct *task, |
| 4534 | struct kern_ipc_perm *perm, |
| 4535 | u16 sclass) |
| 4536 | { |
| 4537 | struct task_security_struct *tsec = task->security; |
| 4538 | struct ipc_security_struct *isec; |
| 4539 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 4540 | isec = kzalloc(sizeof(struct ipc_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4541 | if (!isec) |
| 4542 | return -ENOMEM; |
| 4543 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4544 | isec->sclass = sclass; |
| 4545 | isec->ipc_perm = perm; |
Stephen Smalley | 9ac49d2 | 2006-02-01 03:05:56 -0800 | [diff] [blame] | 4546 | isec->sid = tsec->sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4547 | perm->security = isec; |
| 4548 | |
| 4549 | return 0; |
| 4550 | } |
| 4551 | |
| 4552 | static void ipc_free_security(struct kern_ipc_perm *perm) |
| 4553 | { |
| 4554 | struct ipc_security_struct *isec = perm->security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4555 | perm->security = NULL; |
| 4556 | kfree(isec); |
| 4557 | } |
| 4558 | |
| 4559 | static int msg_msg_alloc_security(struct msg_msg *msg) |
| 4560 | { |
| 4561 | struct msg_security_struct *msec; |
| 4562 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 4563 | msec = kzalloc(sizeof(struct msg_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4564 | if (!msec) |
| 4565 | return -ENOMEM; |
| 4566 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4567 | msec->msg = msg; |
| 4568 | msec->sid = SECINITSID_UNLABELED; |
| 4569 | msg->security = msec; |
| 4570 | |
| 4571 | return 0; |
| 4572 | } |
| 4573 | |
| 4574 | static void msg_msg_free_security(struct msg_msg *msg) |
| 4575 | { |
| 4576 | struct msg_security_struct *msec = msg->security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4577 | |
| 4578 | msg->security = NULL; |
| 4579 | kfree(msec); |
| 4580 | } |
| 4581 | |
| 4582 | static int ipc_has_perm(struct kern_ipc_perm *ipc_perms, |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 4583 | u32 perms) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4584 | { |
| 4585 | struct task_security_struct *tsec; |
| 4586 | struct ipc_security_struct *isec; |
| 4587 | struct avc_audit_data ad; |
| 4588 | |
| 4589 | tsec = current->security; |
| 4590 | isec = ipc_perms->security; |
| 4591 | |
| 4592 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 4593 | ad.u.ipc_id = ipc_perms->key; |
| 4594 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 4595 | return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4596 | } |
| 4597 | |
| 4598 | static int selinux_msg_msg_alloc_security(struct msg_msg *msg) |
| 4599 | { |
| 4600 | return msg_msg_alloc_security(msg); |
| 4601 | } |
| 4602 | |
| 4603 | static void selinux_msg_msg_free_security(struct msg_msg *msg) |
| 4604 | { |
| 4605 | msg_msg_free_security(msg); |
| 4606 | } |
| 4607 | |
| 4608 | /* message queue security operations */ |
| 4609 | static int selinux_msg_queue_alloc_security(struct msg_queue *msq) |
| 4610 | { |
| 4611 | struct task_security_struct *tsec; |
| 4612 | struct ipc_security_struct *isec; |
| 4613 | struct avc_audit_data ad; |
| 4614 | int rc; |
| 4615 | |
| 4616 | rc = ipc_alloc_security(current, &msq->q_perm, SECCLASS_MSGQ); |
| 4617 | if (rc) |
| 4618 | return rc; |
| 4619 | |
| 4620 | tsec = current->security; |
| 4621 | isec = msq->q_perm.security; |
| 4622 | |
| 4623 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 4624 | ad.u.ipc_id = msq->q_perm.key; |
| 4625 | |
| 4626 | rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ, |
| 4627 | MSGQ__CREATE, &ad); |
| 4628 | if (rc) { |
| 4629 | ipc_free_security(&msq->q_perm); |
| 4630 | return rc; |
| 4631 | } |
| 4632 | return 0; |
| 4633 | } |
| 4634 | |
| 4635 | static void selinux_msg_queue_free_security(struct msg_queue *msq) |
| 4636 | { |
| 4637 | ipc_free_security(&msq->q_perm); |
| 4638 | } |
| 4639 | |
| 4640 | static int selinux_msg_queue_associate(struct msg_queue *msq, int msqflg) |
| 4641 | { |
| 4642 | struct task_security_struct *tsec; |
| 4643 | struct ipc_security_struct *isec; |
| 4644 | struct avc_audit_data ad; |
| 4645 | |
| 4646 | tsec = current->security; |
| 4647 | isec = msq->q_perm.security; |
| 4648 | |
| 4649 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 4650 | ad.u.ipc_id = msq->q_perm.key; |
| 4651 | |
| 4652 | return avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ, |
| 4653 | MSGQ__ASSOCIATE, &ad); |
| 4654 | } |
| 4655 | |
| 4656 | static int selinux_msg_queue_msgctl(struct msg_queue *msq, int cmd) |
| 4657 | { |
| 4658 | int err; |
| 4659 | int perms; |
| 4660 | |
| 4661 | switch(cmd) { |
| 4662 | case IPC_INFO: |
| 4663 | case MSG_INFO: |
| 4664 | /* No specific object, just general system-wide information. */ |
| 4665 | return task_has_system(current, SYSTEM__IPC_INFO); |
| 4666 | case IPC_STAT: |
| 4667 | case MSG_STAT: |
| 4668 | perms = MSGQ__GETATTR | MSGQ__ASSOCIATE; |
| 4669 | break; |
| 4670 | case IPC_SET: |
| 4671 | perms = MSGQ__SETATTR; |
| 4672 | break; |
| 4673 | case IPC_RMID: |
| 4674 | perms = MSGQ__DESTROY; |
| 4675 | break; |
| 4676 | default: |
| 4677 | return 0; |
| 4678 | } |
| 4679 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 4680 | err = ipc_has_perm(&msq->q_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4681 | return err; |
| 4682 | } |
| 4683 | |
| 4684 | static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, int msqflg) |
| 4685 | { |
| 4686 | struct task_security_struct *tsec; |
| 4687 | struct ipc_security_struct *isec; |
| 4688 | struct msg_security_struct *msec; |
| 4689 | struct avc_audit_data ad; |
| 4690 | int rc; |
| 4691 | |
| 4692 | tsec = current->security; |
| 4693 | isec = msq->q_perm.security; |
| 4694 | msec = msg->security; |
| 4695 | |
| 4696 | /* |
| 4697 | * First time through, need to assign label to the message |
| 4698 | */ |
| 4699 | if (msec->sid == SECINITSID_UNLABELED) { |
| 4700 | /* |
| 4701 | * Compute new sid based on current process and |
| 4702 | * message queue this message will be stored in |
| 4703 | */ |
| 4704 | rc = security_transition_sid(tsec->sid, |
| 4705 | isec->sid, |
| 4706 | SECCLASS_MSG, |
| 4707 | &msec->sid); |
| 4708 | if (rc) |
| 4709 | return rc; |
| 4710 | } |
| 4711 | |
| 4712 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 4713 | ad.u.ipc_id = msq->q_perm.key; |
| 4714 | |
| 4715 | /* Can this process write to the queue? */ |
| 4716 | rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ, |
| 4717 | MSGQ__WRITE, &ad); |
| 4718 | if (!rc) |
| 4719 | /* Can this process send the message */ |
| 4720 | rc = avc_has_perm(tsec->sid, msec->sid, |
| 4721 | SECCLASS_MSG, MSG__SEND, &ad); |
| 4722 | if (!rc) |
| 4723 | /* Can the message be put in the queue? */ |
| 4724 | rc = avc_has_perm(msec->sid, isec->sid, |
| 4725 | SECCLASS_MSGQ, MSGQ__ENQUEUE, &ad); |
| 4726 | |
| 4727 | return rc; |
| 4728 | } |
| 4729 | |
| 4730 | static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, |
| 4731 | struct task_struct *target, |
| 4732 | long type, int mode) |
| 4733 | { |
| 4734 | struct task_security_struct *tsec; |
| 4735 | struct ipc_security_struct *isec; |
| 4736 | struct msg_security_struct *msec; |
| 4737 | struct avc_audit_data ad; |
| 4738 | int rc; |
| 4739 | |
| 4740 | tsec = target->security; |
| 4741 | isec = msq->q_perm.security; |
| 4742 | msec = msg->security; |
| 4743 | |
| 4744 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 4745 | ad.u.ipc_id = msq->q_perm.key; |
| 4746 | |
| 4747 | rc = avc_has_perm(tsec->sid, isec->sid, |
| 4748 | SECCLASS_MSGQ, MSGQ__READ, &ad); |
| 4749 | if (!rc) |
| 4750 | rc = avc_has_perm(tsec->sid, msec->sid, |
| 4751 | SECCLASS_MSG, MSG__RECEIVE, &ad); |
| 4752 | return rc; |
| 4753 | } |
| 4754 | |
| 4755 | /* Shared Memory security operations */ |
| 4756 | static int selinux_shm_alloc_security(struct shmid_kernel *shp) |
| 4757 | { |
| 4758 | struct task_security_struct *tsec; |
| 4759 | struct ipc_security_struct *isec; |
| 4760 | struct avc_audit_data ad; |
| 4761 | int rc; |
| 4762 | |
| 4763 | rc = ipc_alloc_security(current, &shp->shm_perm, SECCLASS_SHM); |
| 4764 | if (rc) |
| 4765 | return rc; |
| 4766 | |
| 4767 | tsec = current->security; |
| 4768 | isec = shp->shm_perm.security; |
| 4769 | |
| 4770 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 4771 | ad.u.ipc_id = shp->shm_perm.key; |
| 4772 | |
| 4773 | rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_SHM, |
| 4774 | SHM__CREATE, &ad); |
| 4775 | if (rc) { |
| 4776 | ipc_free_security(&shp->shm_perm); |
| 4777 | return rc; |
| 4778 | } |
| 4779 | return 0; |
| 4780 | } |
| 4781 | |
| 4782 | static void selinux_shm_free_security(struct shmid_kernel *shp) |
| 4783 | { |
| 4784 | ipc_free_security(&shp->shm_perm); |
| 4785 | } |
| 4786 | |
| 4787 | static int selinux_shm_associate(struct shmid_kernel *shp, int shmflg) |
| 4788 | { |
| 4789 | struct task_security_struct *tsec; |
| 4790 | struct ipc_security_struct *isec; |
| 4791 | struct avc_audit_data ad; |
| 4792 | |
| 4793 | tsec = current->security; |
| 4794 | isec = shp->shm_perm.security; |
| 4795 | |
| 4796 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 4797 | ad.u.ipc_id = shp->shm_perm.key; |
| 4798 | |
| 4799 | return avc_has_perm(tsec->sid, isec->sid, SECCLASS_SHM, |
| 4800 | SHM__ASSOCIATE, &ad); |
| 4801 | } |
| 4802 | |
| 4803 | /* Note, at this point, shp is locked down */ |
| 4804 | static int selinux_shm_shmctl(struct shmid_kernel *shp, int cmd) |
| 4805 | { |
| 4806 | int perms; |
| 4807 | int err; |
| 4808 | |
| 4809 | switch(cmd) { |
| 4810 | case IPC_INFO: |
| 4811 | case SHM_INFO: |
| 4812 | /* No specific object, just general system-wide information. */ |
| 4813 | return task_has_system(current, SYSTEM__IPC_INFO); |
| 4814 | case IPC_STAT: |
| 4815 | case SHM_STAT: |
| 4816 | perms = SHM__GETATTR | SHM__ASSOCIATE; |
| 4817 | break; |
| 4818 | case IPC_SET: |
| 4819 | perms = SHM__SETATTR; |
| 4820 | break; |
| 4821 | case SHM_LOCK: |
| 4822 | case SHM_UNLOCK: |
| 4823 | perms = SHM__LOCK; |
| 4824 | break; |
| 4825 | case IPC_RMID: |
| 4826 | perms = SHM__DESTROY; |
| 4827 | break; |
| 4828 | default: |
| 4829 | return 0; |
| 4830 | } |
| 4831 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 4832 | err = ipc_has_perm(&shp->shm_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4833 | return err; |
| 4834 | } |
| 4835 | |
| 4836 | static int selinux_shm_shmat(struct shmid_kernel *shp, |
| 4837 | char __user *shmaddr, int shmflg) |
| 4838 | { |
| 4839 | u32 perms; |
| 4840 | int rc; |
| 4841 | |
| 4842 | rc = secondary_ops->shm_shmat(shp, shmaddr, shmflg); |
| 4843 | if (rc) |
| 4844 | return rc; |
| 4845 | |
| 4846 | if (shmflg & SHM_RDONLY) |
| 4847 | perms = SHM__READ; |
| 4848 | else |
| 4849 | perms = SHM__READ | SHM__WRITE; |
| 4850 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 4851 | return ipc_has_perm(&shp->shm_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4852 | } |
| 4853 | |
| 4854 | /* Semaphore security operations */ |
| 4855 | static int selinux_sem_alloc_security(struct sem_array *sma) |
| 4856 | { |
| 4857 | struct task_security_struct *tsec; |
| 4858 | struct ipc_security_struct *isec; |
| 4859 | struct avc_audit_data ad; |
| 4860 | int rc; |
| 4861 | |
| 4862 | rc = ipc_alloc_security(current, &sma->sem_perm, SECCLASS_SEM); |
| 4863 | if (rc) |
| 4864 | return rc; |
| 4865 | |
| 4866 | tsec = current->security; |
| 4867 | isec = sma->sem_perm.security; |
| 4868 | |
| 4869 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 4870 | ad.u.ipc_id = sma->sem_perm.key; |
| 4871 | |
| 4872 | rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_SEM, |
| 4873 | SEM__CREATE, &ad); |
| 4874 | if (rc) { |
| 4875 | ipc_free_security(&sma->sem_perm); |
| 4876 | return rc; |
| 4877 | } |
| 4878 | return 0; |
| 4879 | } |
| 4880 | |
| 4881 | static void selinux_sem_free_security(struct sem_array *sma) |
| 4882 | { |
| 4883 | ipc_free_security(&sma->sem_perm); |
| 4884 | } |
| 4885 | |
| 4886 | static int selinux_sem_associate(struct sem_array *sma, int semflg) |
| 4887 | { |
| 4888 | struct task_security_struct *tsec; |
| 4889 | struct ipc_security_struct *isec; |
| 4890 | struct avc_audit_data ad; |
| 4891 | |
| 4892 | tsec = current->security; |
| 4893 | isec = sma->sem_perm.security; |
| 4894 | |
| 4895 | AVC_AUDIT_DATA_INIT(&ad, IPC); |
| 4896 | ad.u.ipc_id = sma->sem_perm.key; |
| 4897 | |
| 4898 | return avc_has_perm(tsec->sid, isec->sid, SECCLASS_SEM, |
| 4899 | SEM__ASSOCIATE, &ad); |
| 4900 | } |
| 4901 | |
| 4902 | /* Note, at this point, sma is locked down */ |
| 4903 | static int selinux_sem_semctl(struct sem_array *sma, int cmd) |
| 4904 | { |
| 4905 | int err; |
| 4906 | u32 perms; |
| 4907 | |
| 4908 | switch(cmd) { |
| 4909 | case IPC_INFO: |
| 4910 | case SEM_INFO: |
| 4911 | /* No specific object, just general system-wide information. */ |
| 4912 | return task_has_system(current, SYSTEM__IPC_INFO); |
| 4913 | case GETPID: |
| 4914 | case GETNCNT: |
| 4915 | case GETZCNT: |
| 4916 | perms = SEM__GETATTR; |
| 4917 | break; |
| 4918 | case GETVAL: |
| 4919 | case GETALL: |
| 4920 | perms = SEM__READ; |
| 4921 | break; |
| 4922 | case SETVAL: |
| 4923 | case SETALL: |
| 4924 | perms = SEM__WRITE; |
| 4925 | break; |
| 4926 | case IPC_RMID: |
| 4927 | perms = SEM__DESTROY; |
| 4928 | break; |
| 4929 | case IPC_SET: |
| 4930 | perms = SEM__SETATTR; |
| 4931 | break; |
| 4932 | case IPC_STAT: |
| 4933 | case SEM_STAT: |
| 4934 | perms = SEM__GETATTR | SEM__ASSOCIATE; |
| 4935 | break; |
| 4936 | default: |
| 4937 | return 0; |
| 4938 | } |
| 4939 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 4940 | err = ipc_has_perm(&sma->sem_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4941 | return err; |
| 4942 | } |
| 4943 | |
| 4944 | static int selinux_sem_semop(struct sem_array *sma, |
| 4945 | struct sembuf *sops, unsigned nsops, int alter) |
| 4946 | { |
| 4947 | u32 perms; |
| 4948 | |
| 4949 | if (alter) |
| 4950 | perms = SEM__READ | SEM__WRITE; |
| 4951 | else |
| 4952 | perms = SEM__READ; |
| 4953 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 4954 | return ipc_has_perm(&sma->sem_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4955 | } |
| 4956 | |
| 4957 | static int selinux_ipc_permission(struct kern_ipc_perm *ipcp, short flag) |
| 4958 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4959 | u32 av = 0; |
| 4960 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4961 | av = 0; |
| 4962 | if (flag & S_IRUGO) |
| 4963 | av |= IPC__UNIX_READ; |
| 4964 | if (flag & S_IWUGO) |
| 4965 | av |= IPC__UNIX_WRITE; |
| 4966 | |
| 4967 | if (av == 0) |
| 4968 | return 0; |
| 4969 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 4970 | return ipc_has_perm(ipcp, av); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4971 | } |
| 4972 | |
| 4973 | /* module stacking operations */ |
| 4974 | static int selinux_register_security (const char *name, struct security_operations *ops) |
| 4975 | { |
| 4976 | if (secondary_ops != original_ops) { |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 4977 | printk(KERN_ERR "%s: There is already a secondary security " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4978 | "module registered.\n", __FUNCTION__); |
| 4979 | return -EINVAL; |
| 4980 | } |
| 4981 | |
| 4982 | secondary_ops = ops; |
| 4983 | |
| 4984 | printk(KERN_INFO "%s: Registering secondary module %s\n", |
| 4985 | __FUNCTION__, |
| 4986 | name); |
| 4987 | |
| 4988 | return 0; |
| 4989 | } |
| 4990 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4991 | static void selinux_d_instantiate (struct dentry *dentry, struct inode *inode) |
| 4992 | { |
| 4993 | if (inode) |
| 4994 | inode_doinit_with_dentry(inode, dentry); |
| 4995 | } |
| 4996 | |
| 4997 | static int selinux_getprocattr(struct task_struct *p, |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 4998 | char *name, char **value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4999 | { |
| 5000 | struct task_security_struct *tsec; |
Dustin Kirkland | 8c8570f | 2005-11-03 17:15:16 +0000 | [diff] [blame] | 5001 | u32 sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5002 | int error; |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 5003 | unsigned len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5004 | |
| 5005 | if (current != p) { |
| 5006 | error = task_has_perm(current, p, PROCESS__GETATTR); |
| 5007 | if (error) |
| 5008 | return error; |
| 5009 | } |
| 5010 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5011 | tsec = p->security; |
| 5012 | |
| 5013 | if (!strcmp(name, "current")) |
| 5014 | sid = tsec->sid; |
| 5015 | else if (!strcmp(name, "prev")) |
| 5016 | sid = tsec->osid; |
| 5017 | else if (!strcmp(name, "exec")) |
| 5018 | sid = tsec->exec_sid; |
| 5019 | else if (!strcmp(name, "fscreate")) |
| 5020 | sid = tsec->create_sid; |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5021 | else if (!strcmp(name, "keycreate")) |
| 5022 | sid = tsec->keycreate_sid; |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 5023 | else if (!strcmp(name, "sockcreate")) |
| 5024 | sid = tsec->sockcreate_sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5025 | else |
| 5026 | return -EINVAL; |
| 5027 | |
| 5028 | if (!sid) |
| 5029 | return 0; |
| 5030 | |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 5031 | error = security_sid_to_context(sid, value, &len); |
| 5032 | if (error) |
| 5033 | return error; |
| 5034 | return len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5035 | } |
| 5036 | |
| 5037 | static int selinux_setprocattr(struct task_struct *p, |
| 5038 | char *name, void *value, size_t size) |
| 5039 | { |
| 5040 | struct task_security_struct *tsec; |
| 5041 | u32 sid = 0; |
| 5042 | int error; |
| 5043 | char *str = value; |
| 5044 | |
| 5045 | if (current != p) { |
| 5046 | /* SELinux only allows a process to change its own |
| 5047 | security attributes. */ |
| 5048 | return -EACCES; |
| 5049 | } |
| 5050 | |
| 5051 | /* |
| 5052 | * Basic control over ability to set these attributes at all. |
| 5053 | * current == p, but we'll pass them separately in case the |
| 5054 | * above restriction is ever removed. |
| 5055 | */ |
| 5056 | if (!strcmp(name, "exec")) |
| 5057 | error = task_has_perm(current, p, PROCESS__SETEXEC); |
| 5058 | else if (!strcmp(name, "fscreate")) |
| 5059 | error = task_has_perm(current, p, PROCESS__SETFSCREATE); |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5060 | else if (!strcmp(name, "keycreate")) |
| 5061 | error = task_has_perm(current, p, PROCESS__SETKEYCREATE); |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 5062 | else if (!strcmp(name, "sockcreate")) |
| 5063 | error = task_has_perm(current, p, PROCESS__SETSOCKCREATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5064 | else if (!strcmp(name, "current")) |
| 5065 | error = task_has_perm(current, p, PROCESS__SETCURRENT); |
| 5066 | else |
| 5067 | error = -EINVAL; |
| 5068 | if (error) |
| 5069 | return error; |
| 5070 | |
| 5071 | /* Obtain a SID for the context, if one was specified. */ |
| 5072 | if (size && str[1] && str[1] != '\n') { |
| 5073 | if (str[size-1] == '\n') { |
| 5074 | str[size-1] = 0; |
| 5075 | size--; |
| 5076 | } |
| 5077 | error = security_context_to_sid(value, size, &sid); |
| 5078 | if (error) |
| 5079 | return error; |
| 5080 | } |
| 5081 | |
| 5082 | /* Permission checking based on the specified context is |
| 5083 | performed during the actual operation (execve, |
| 5084 | open/mkdir/...), when we know the full context of the |
| 5085 | operation. See selinux_bprm_set_security for the execve |
| 5086 | checks and may_create for the file creation checks. The |
| 5087 | operation will then fail if the context is not permitted. */ |
| 5088 | tsec = p->security; |
| 5089 | if (!strcmp(name, "exec")) |
| 5090 | tsec->exec_sid = sid; |
| 5091 | else if (!strcmp(name, "fscreate")) |
| 5092 | tsec->create_sid = sid; |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5093 | else if (!strcmp(name, "keycreate")) { |
| 5094 | error = may_create_key(sid, p); |
| 5095 | if (error) |
| 5096 | return error; |
| 5097 | tsec->keycreate_sid = sid; |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 5098 | } else if (!strcmp(name, "sockcreate")) |
| 5099 | tsec->sockcreate_sid = sid; |
| 5100 | else if (!strcmp(name, "current")) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5101 | struct av_decision avd; |
| 5102 | |
| 5103 | if (sid == 0) |
| 5104 | return -EINVAL; |
| 5105 | |
| 5106 | /* Only allow single threaded processes to change context */ |
| 5107 | if (atomic_read(&p->mm->mm_users) != 1) { |
| 5108 | struct task_struct *g, *t; |
| 5109 | struct mm_struct *mm = p->mm; |
| 5110 | read_lock(&tasklist_lock); |
| 5111 | do_each_thread(g, t) |
| 5112 | if (t->mm == mm && t != p) { |
| 5113 | read_unlock(&tasklist_lock); |
| 5114 | return -EPERM; |
| 5115 | } |
| 5116 | while_each_thread(g, t); |
| 5117 | read_unlock(&tasklist_lock); |
| 5118 | } |
| 5119 | |
| 5120 | /* Check permissions for the transition. */ |
| 5121 | error = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS, |
| 5122 | PROCESS__DYNTRANSITION, NULL); |
| 5123 | if (error) |
| 5124 | return error; |
| 5125 | |
| 5126 | /* Check for ptracing, and update the task SID if ok. |
| 5127 | Otherwise, leave SID unchanged and fail. */ |
| 5128 | task_lock(p); |
| 5129 | if (p->ptrace & PT_PTRACED) { |
| 5130 | error = avc_has_perm_noaudit(tsec->ptrace_sid, sid, |
| 5131 | SECCLASS_PROCESS, |
Stephen Smalley | 2c3c05d | 2007-06-07 15:34:10 -0400 | [diff] [blame] | 5132 | PROCESS__PTRACE, 0, &avd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5133 | if (!error) |
| 5134 | tsec->sid = sid; |
| 5135 | task_unlock(p); |
| 5136 | avc_audit(tsec->ptrace_sid, sid, SECCLASS_PROCESS, |
| 5137 | PROCESS__PTRACE, &avd, error, NULL); |
| 5138 | if (error) |
| 5139 | return error; |
| 5140 | } else { |
| 5141 | tsec->sid = sid; |
| 5142 | task_unlock(p); |
| 5143 | } |
| 5144 | } |
| 5145 | else |
| 5146 | return -EINVAL; |
| 5147 | |
| 5148 | return size; |
| 5149 | } |
| 5150 | |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5151 | static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) |
| 5152 | { |
| 5153 | return security_sid_to_context(secid, secdata, seclen); |
| 5154 | } |
| 5155 | |
David Howells | 63cb344 | 2008-01-15 23:47:35 +0000 | [diff] [blame] | 5156 | static int selinux_secctx_to_secid(char *secdata, u32 seclen, u32 *secid) |
| 5157 | { |
| 5158 | return security_context_to_sid(secdata, seclen, secid); |
| 5159 | } |
| 5160 | |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5161 | static void selinux_release_secctx(char *secdata, u32 seclen) |
| 5162 | { |
Paul Moore | 088999e | 2007-08-01 11:12:58 -0400 | [diff] [blame] | 5163 | kfree(secdata); |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5164 | } |
| 5165 | |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5166 | #ifdef CONFIG_KEYS |
| 5167 | |
David Howells | 7e047ef | 2006-06-26 00:24:50 -0700 | [diff] [blame] | 5168 | static int selinux_key_alloc(struct key *k, struct task_struct *tsk, |
| 5169 | unsigned long flags) |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5170 | { |
| 5171 | struct task_security_struct *tsec = tsk->security; |
| 5172 | struct key_security_struct *ksec; |
| 5173 | |
| 5174 | ksec = kzalloc(sizeof(struct key_security_struct), GFP_KERNEL); |
| 5175 | if (!ksec) |
| 5176 | return -ENOMEM; |
| 5177 | |
| 5178 | ksec->obj = k; |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5179 | if (tsec->keycreate_sid) |
| 5180 | ksec->sid = tsec->keycreate_sid; |
| 5181 | else |
| 5182 | ksec->sid = tsec->sid; |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5183 | k->security = ksec; |
| 5184 | |
| 5185 | return 0; |
| 5186 | } |
| 5187 | |
| 5188 | static void selinux_key_free(struct key *k) |
| 5189 | { |
| 5190 | struct key_security_struct *ksec = k->security; |
| 5191 | |
| 5192 | k->security = NULL; |
| 5193 | kfree(ksec); |
| 5194 | } |
| 5195 | |
| 5196 | static int selinux_key_permission(key_ref_t key_ref, |
| 5197 | struct task_struct *ctx, |
| 5198 | key_perm_t perm) |
| 5199 | { |
| 5200 | struct key *key; |
| 5201 | struct task_security_struct *tsec; |
| 5202 | struct key_security_struct *ksec; |
| 5203 | |
| 5204 | key = key_ref_to_ptr(key_ref); |
| 5205 | |
| 5206 | tsec = ctx->security; |
| 5207 | ksec = key->security; |
| 5208 | |
| 5209 | /* if no specific permissions are requested, we skip the |
| 5210 | permission check. No serious, additional covert channels |
| 5211 | appear to be created. */ |
| 5212 | if (perm == 0) |
| 5213 | return 0; |
| 5214 | |
| 5215 | return avc_has_perm(tsec->sid, ksec->sid, |
| 5216 | SECCLASS_KEY, perm, NULL); |
| 5217 | } |
| 5218 | |
| 5219 | #endif |
| 5220 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5221 | static struct security_operations selinux_ops = { |
| 5222 | .ptrace = selinux_ptrace, |
| 5223 | .capget = selinux_capget, |
| 5224 | .capset_check = selinux_capset_check, |
| 5225 | .capset_set = selinux_capset_set, |
| 5226 | .sysctl = selinux_sysctl, |
| 5227 | .capable = selinux_capable, |
| 5228 | .quotactl = selinux_quotactl, |
| 5229 | .quota_on = selinux_quota_on, |
| 5230 | .syslog = selinux_syslog, |
| 5231 | .vm_enough_memory = selinux_vm_enough_memory, |
| 5232 | |
| 5233 | .netlink_send = selinux_netlink_send, |
| 5234 | .netlink_recv = selinux_netlink_recv, |
| 5235 | |
| 5236 | .bprm_alloc_security = selinux_bprm_alloc_security, |
| 5237 | .bprm_free_security = selinux_bprm_free_security, |
| 5238 | .bprm_apply_creds = selinux_bprm_apply_creds, |
| 5239 | .bprm_post_apply_creds = selinux_bprm_post_apply_creds, |
| 5240 | .bprm_set_security = selinux_bprm_set_security, |
| 5241 | .bprm_check_security = selinux_bprm_check_security, |
| 5242 | .bprm_secureexec = selinux_bprm_secureexec, |
| 5243 | |
| 5244 | .sb_alloc_security = selinux_sb_alloc_security, |
| 5245 | .sb_free_security = selinux_sb_free_security, |
| 5246 | .sb_copy_data = selinux_sb_copy_data, |
| 5247 | .sb_kern_mount = selinux_sb_kern_mount, |
| 5248 | .sb_statfs = selinux_sb_statfs, |
| 5249 | .sb_mount = selinux_mount, |
| 5250 | .sb_umount = selinux_umount, |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 5251 | .sb_get_mnt_opts = selinux_get_mnt_opts, |
| 5252 | .sb_set_mnt_opts = selinux_set_mnt_opts, |
| 5253 | .sb_clone_mnt_opts = selinux_sb_clone_mnt_opts, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5254 | |
| 5255 | .inode_alloc_security = selinux_inode_alloc_security, |
| 5256 | .inode_free_security = selinux_inode_free_security, |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 5257 | .inode_init_security = selinux_inode_init_security, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5258 | .inode_create = selinux_inode_create, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5259 | .inode_link = selinux_inode_link, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5260 | .inode_unlink = selinux_inode_unlink, |
| 5261 | .inode_symlink = selinux_inode_symlink, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5262 | .inode_mkdir = selinux_inode_mkdir, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5263 | .inode_rmdir = selinux_inode_rmdir, |
| 5264 | .inode_mknod = selinux_inode_mknod, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5265 | .inode_rename = selinux_inode_rename, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5266 | .inode_readlink = selinux_inode_readlink, |
| 5267 | .inode_follow_link = selinux_inode_follow_link, |
| 5268 | .inode_permission = selinux_inode_permission, |
| 5269 | .inode_setattr = selinux_inode_setattr, |
| 5270 | .inode_getattr = selinux_inode_getattr, |
| 5271 | .inode_setxattr = selinux_inode_setxattr, |
| 5272 | .inode_post_setxattr = selinux_inode_post_setxattr, |
| 5273 | .inode_getxattr = selinux_inode_getxattr, |
| 5274 | .inode_listxattr = selinux_inode_listxattr, |
| 5275 | .inode_removexattr = selinux_inode_removexattr, |
| 5276 | .inode_getsecurity = selinux_inode_getsecurity, |
| 5277 | .inode_setsecurity = selinux_inode_setsecurity, |
| 5278 | .inode_listsecurity = selinux_inode_listsecurity, |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 5279 | .inode_need_killpriv = selinux_inode_need_killpriv, |
| 5280 | .inode_killpriv = selinux_inode_killpriv, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5281 | |
| 5282 | .file_permission = selinux_file_permission, |
| 5283 | .file_alloc_security = selinux_file_alloc_security, |
| 5284 | .file_free_security = selinux_file_free_security, |
| 5285 | .file_ioctl = selinux_file_ioctl, |
| 5286 | .file_mmap = selinux_file_mmap, |
| 5287 | .file_mprotect = selinux_file_mprotect, |
| 5288 | .file_lock = selinux_file_lock, |
| 5289 | .file_fcntl = selinux_file_fcntl, |
| 5290 | .file_set_fowner = selinux_file_set_fowner, |
| 5291 | .file_send_sigiotask = selinux_file_send_sigiotask, |
| 5292 | .file_receive = selinux_file_receive, |
| 5293 | |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 5294 | .dentry_open = selinux_dentry_open, |
| 5295 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5296 | .task_create = selinux_task_create, |
| 5297 | .task_alloc_security = selinux_task_alloc_security, |
| 5298 | .task_free_security = selinux_task_free_security, |
| 5299 | .task_setuid = selinux_task_setuid, |
| 5300 | .task_post_setuid = selinux_task_post_setuid, |
| 5301 | .task_setgid = selinux_task_setgid, |
| 5302 | .task_setpgid = selinux_task_setpgid, |
| 5303 | .task_getpgid = selinux_task_getpgid, |
| 5304 | .task_getsid = selinux_task_getsid, |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 5305 | .task_getsecid = selinux_task_getsecid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5306 | .task_setgroups = selinux_task_setgroups, |
| 5307 | .task_setnice = selinux_task_setnice, |
James Morris | 03e6806 | 2006-06-23 02:03:58 -0700 | [diff] [blame] | 5308 | .task_setioprio = selinux_task_setioprio, |
David Quigley | a1836a4 | 2006-06-30 01:55:49 -0700 | [diff] [blame] | 5309 | .task_getioprio = selinux_task_getioprio, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5310 | .task_setrlimit = selinux_task_setrlimit, |
| 5311 | .task_setscheduler = selinux_task_setscheduler, |
| 5312 | .task_getscheduler = selinux_task_getscheduler, |
David Quigley | 3560154 | 2006-06-23 02:04:01 -0700 | [diff] [blame] | 5313 | .task_movememory = selinux_task_movememory, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5314 | .task_kill = selinux_task_kill, |
| 5315 | .task_wait = selinux_task_wait, |
| 5316 | .task_prctl = selinux_task_prctl, |
| 5317 | .task_reparent_to_init = selinux_task_reparent_to_init, |
| 5318 | .task_to_inode = selinux_task_to_inode, |
| 5319 | |
| 5320 | .ipc_permission = selinux_ipc_permission, |
| 5321 | |
| 5322 | .msg_msg_alloc_security = selinux_msg_msg_alloc_security, |
| 5323 | .msg_msg_free_security = selinux_msg_msg_free_security, |
| 5324 | |
| 5325 | .msg_queue_alloc_security = selinux_msg_queue_alloc_security, |
| 5326 | .msg_queue_free_security = selinux_msg_queue_free_security, |
| 5327 | .msg_queue_associate = selinux_msg_queue_associate, |
| 5328 | .msg_queue_msgctl = selinux_msg_queue_msgctl, |
| 5329 | .msg_queue_msgsnd = selinux_msg_queue_msgsnd, |
| 5330 | .msg_queue_msgrcv = selinux_msg_queue_msgrcv, |
| 5331 | |
| 5332 | .shm_alloc_security = selinux_shm_alloc_security, |
| 5333 | .shm_free_security = selinux_shm_free_security, |
| 5334 | .shm_associate = selinux_shm_associate, |
| 5335 | .shm_shmctl = selinux_shm_shmctl, |
| 5336 | .shm_shmat = selinux_shm_shmat, |
| 5337 | |
| 5338 | .sem_alloc_security = selinux_sem_alloc_security, |
| 5339 | .sem_free_security = selinux_sem_free_security, |
| 5340 | .sem_associate = selinux_sem_associate, |
| 5341 | .sem_semctl = selinux_sem_semctl, |
| 5342 | .sem_semop = selinux_sem_semop, |
| 5343 | |
| 5344 | .register_security = selinux_register_security, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5345 | |
| 5346 | .d_instantiate = selinux_d_instantiate, |
| 5347 | |
| 5348 | .getprocattr = selinux_getprocattr, |
| 5349 | .setprocattr = selinux_setprocattr, |
| 5350 | |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5351 | .secid_to_secctx = selinux_secid_to_secctx, |
David Howells | 63cb344 | 2008-01-15 23:47:35 +0000 | [diff] [blame] | 5352 | .secctx_to_secid = selinux_secctx_to_secid, |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5353 | .release_secctx = selinux_release_secctx, |
| 5354 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5355 | .unix_stream_connect = selinux_socket_unix_stream_connect, |
| 5356 | .unix_may_send = selinux_socket_unix_may_send, |
| 5357 | |
| 5358 | .socket_create = selinux_socket_create, |
| 5359 | .socket_post_create = selinux_socket_post_create, |
| 5360 | .socket_bind = selinux_socket_bind, |
| 5361 | .socket_connect = selinux_socket_connect, |
| 5362 | .socket_listen = selinux_socket_listen, |
| 5363 | .socket_accept = selinux_socket_accept, |
| 5364 | .socket_sendmsg = selinux_socket_sendmsg, |
| 5365 | .socket_recvmsg = selinux_socket_recvmsg, |
| 5366 | .socket_getsockname = selinux_socket_getsockname, |
| 5367 | .socket_getpeername = selinux_socket_getpeername, |
| 5368 | .socket_getsockopt = selinux_socket_getsockopt, |
| 5369 | .socket_setsockopt = selinux_socket_setsockopt, |
| 5370 | .socket_shutdown = selinux_socket_shutdown, |
| 5371 | .socket_sock_rcv_skb = selinux_socket_sock_rcv_skb, |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 5372 | .socket_getpeersec_stream = selinux_socket_getpeersec_stream, |
| 5373 | .socket_getpeersec_dgram = selinux_socket_getpeersec_dgram, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5374 | .sk_alloc_security = selinux_sk_alloc_security, |
| 5375 | .sk_free_security = selinux_sk_free_security, |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 5376 | .sk_clone_security = selinux_sk_clone_security, |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 5377 | .sk_getsecid = selinux_sk_getsecid, |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 5378 | .sock_graft = selinux_sock_graft, |
| 5379 | .inet_conn_request = selinux_inet_conn_request, |
| 5380 | .inet_csk_clone = selinux_inet_csk_clone, |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 5381 | .inet_conn_established = selinux_inet_conn_established, |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 5382 | .req_classify_flow = selinux_req_classify_flow, |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 5383 | |
| 5384 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
| 5385 | .xfrm_policy_alloc_security = selinux_xfrm_policy_alloc, |
| 5386 | .xfrm_policy_clone_security = selinux_xfrm_policy_clone, |
| 5387 | .xfrm_policy_free_security = selinux_xfrm_policy_free, |
Catherine Zhang | c8c05a8 | 2006-06-08 23:39:49 -0700 | [diff] [blame] | 5388 | .xfrm_policy_delete_security = selinux_xfrm_policy_delete, |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 5389 | .xfrm_state_alloc_security = selinux_xfrm_state_alloc, |
| 5390 | .xfrm_state_free_security = selinux_xfrm_state_free, |
Catherine Zhang | c8c05a8 | 2006-06-08 23:39:49 -0700 | [diff] [blame] | 5391 | .xfrm_state_delete_security = selinux_xfrm_state_delete, |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 5392 | .xfrm_policy_lookup = selinux_xfrm_policy_lookup, |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 5393 | .xfrm_state_pol_flow_match = selinux_xfrm_state_pol_flow_match, |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 5394 | .xfrm_decode_session = selinux_xfrm_decode_session, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5395 | #endif |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5396 | |
| 5397 | #ifdef CONFIG_KEYS |
| 5398 | .key_alloc = selinux_key_alloc, |
| 5399 | .key_free = selinux_key_free, |
| 5400 | .key_permission = selinux_key_permission, |
| 5401 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5402 | }; |
| 5403 | |
| 5404 | static __init int selinux_init(void) |
| 5405 | { |
| 5406 | struct task_security_struct *tsec; |
| 5407 | |
| 5408 | if (!selinux_enabled) { |
| 5409 | printk(KERN_INFO "SELinux: Disabled at boot.\n"); |
| 5410 | return 0; |
| 5411 | } |
| 5412 | |
| 5413 | printk(KERN_INFO "SELinux: Initializing.\n"); |
| 5414 | |
| 5415 | /* Set the security state for the initial task. */ |
| 5416 | if (task_alloc_security(current)) |
| 5417 | panic("SELinux: Failed to initialize initial task.\n"); |
| 5418 | tsec = current->security; |
| 5419 | tsec->osid = tsec->sid = SECINITSID_KERNEL; |
| 5420 | |
James Morris | 7cae7e2 | 2006-03-22 00:09:22 -0800 | [diff] [blame] | 5421 | sel_inode_cache = kmem_cache_create("selinux_inode_security", |
| 5422 | sizeof(struct inode_security_struct), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 5423 | 0, SLAB_PANIC, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5424 | avc_init(); |
| 5425 | |
| 5426 | original_ops = secondary_ops = security_ops; |
| 5427 | if (!secondary_ops) |
| 5428 | panic ("SELinux: No initial security operations\n"); |
| 5429 | if (register_security (&selinux_ops)) |
| 5430 | panic("SELinux: Unable to register with kernel.\n"); |
| 5431 | |
| 5432 | if (selinux_enforcing) { |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5433 | printk(KERN_DEBUG "SELinux: Starting in enforcing mode\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5434 | } else { |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5435 | printk(KERN_DEBUG "SELinux: Starting in permissive mode\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5436 | } |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5437 | |
| 5438 | #ifdef CONFIG_KEYS |
| 5439 | /* Add security information to initial keyrings */ |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5440 | selinux_key_alloc(&root_user_keyring, current, |
| 5441 | KEY_ALLOC_NOT_IN_QUOTA); |
| 5442 | selinux_key_alloc(&root_session_keyring, current, |
| 5443 | KEY_ALLOC_NOT_IN_QUOTA); |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5444 | #endif |
| 5445 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5446 | return 0; |
| 5447 | } |
| 5448 | |
| 5449 | void selinux_complete_init(void) |
| 5450 | { |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5451 | printk(KERN_DEBUG "SELinux: Completing initialization.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5452 | |
| 5453 | /* Set up any superblocks initialized prior to the policy load. */ |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5454 | printk(KERN_DEBUG "SELinux: Setting up existing superblocks.\n"); |
Stephen Smalley | ba0c19e | 2006-06-04 02:51:30 -0700 | [diff] [blame] | 5455 | spin_lock(&sb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5456 | spin_lock(&sb_security_lock); |
| 5457 | next_sb: |
| 5458 | if (!list_empty(&superblock_security_head)) { |
| 5459 | struct superblock_security_struct *sbsec = |
| 5460 | list_entry(superblock_security_head.next, |
| 5461 | struct superblock_security_struct, |
| 5462 | list); |
| 5463 | struct super_block *sb = sbsec->sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5464 | sb->s_count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5465 | spin_unlock(&sb_security_lock); |
Stephen Smalley | ba0c19e | 2006-06-04 02:51:30 -0700 | [diff] [blame] | 5466 | spin_unlock(&sb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5467 | down_read(&sb->s_umount); |
| 5468 | if (sb->s_root) |
| 5469 | superblock_doinit(sb, NULL); |
| 5470 | drop_super(sb); |
Stephen Smalley | ba0c19e | 2006-06-04 02:51:30 -0700 | [diff] [blame] | 5471 | spin_lock(&sb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5472 | spin_lock(&sb_security_lock); |
| 5473 | list_del_init(&sbsec->list); |
| 5474 | goto next_sb; |
| 5475 | } |
| 5476 | spin_unlock(&sb_security_lock); |
Stephen Smalley | ba0c19e | 2006-06-04 02:51:30 -0700 | [diff] [blame] | 5477 | spin_unlock(&sb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5478 | } |
| 5479 | |
| 5480 | /* SELinux requires early initialization in order to label |
| 5481 | all processes and objects when they are created. */ |
| 5482 | security_initcall(selinux_init); |
| 5483 | |
Stephen Smalley | c2b507f | 2006-02-04 23:27:50 -0800 | [diff] [blame] | 5484 | #if defined(CONFIG_NETFILTER) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5485 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5486 | static struct nf_hook_ops selinux_ipv4_ops[] = { |
| 5487 | { |
| 5488 | .hook = selinux_ipv4_postroute, |
| 5489 | .owner = THIS_MODULE, |
| 5490 | .pf = PF_INET, |
| 5491 | .hooknum = NF_INET_POST_ROUTING, |
| 5492 | .priority = NF_IP_PRI_SELINUX_LAST, |
| 5493 | }, |
| 5494 | { |
| 5495 | .hook = selinux_ipv4_forward, |
| 5496 | .owner = THIS_MODULE, |
| 5497 | .pf = PF_INET, |
| 5498 | .hooknum = NF_INET_FORWARD, |
| 5499 | .priority = NF_IP_PRI_SELINUX_FIRST, |
| 5500 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5501 | }; |
| 5502 | |
| 5503 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 5504 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5505 | static struct nf_hook_ops selinux_ipv6_ops[] = { |
| 5506 | { |
| 5507 | .hook = selinux_ipv6_postroute, |
| 5508 | .owner = THIS_MODULE, |
| 5509 | .pf = PF_INET6, |
| 5510 | .hooknum = NF_INET_POST_ROUTING, |
| 5511 | .priority = NF_IP6_PRI_SELINUX_LAST, |
| 5512 | }, |
| 5513 | { |
| 5514 | .hook = selinux_ipv6_forward, |
| 5515 | .owner = THIS_MODULE, |
| 5516 | .pf = PF_INET6, |
| 5517 | .hooknum = NF_INET_FORWARD, |
| 5518 | .priority = NF_IP6_PRI_SELINUX_FIRST, |
| 5519 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5520 | }; |
| 5521 | |
| 5522 | #endif /* IPV6 */ |
| 5523 | |
| 5524 | static int __init selinux_nf_ip_init(void) |
| 5525 | { |
| 5526 | int err = 0; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5527 | u32 iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5528 | |
| 5529 | if (!selinux_enabled) |
| 5530 | goto out; |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5531 | |
| 5532 | printk(KERN_DEBUG "SELinux: Registering netfilter hooks\n"); |
| 5533 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5534 | for (iter = 0; iter < ARRAY_SIZE(selinux_ipv4_ops); iter++) { |
| 5535 | err = nf_register_hook(&selinux_ipv4_ops[iter]); |
| 5536 | if (err) |
| 5537 | panic("SELinux: nf_register_hook for IPv4: error %d\n", |
| 5538 | err); |
| 5539 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5540 | |
| 5541 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5542 | for (iter = 0; iter < ARRAY_SIZE(selinux_ipv6_ops); iter++) { |
| 5543 | err = nf_register_hook(&selinux_ipv6_ops[iter]); |
| 5544 | if (err) |
| 5545 | panic("SELinux: nf_register_hook for IPv6: error %d\n", |
| 5546 | err); |
| 5547 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5548 | #endif /* IPV6 */ |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 5549 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5550 | out: |
| 5551 | return err; |
| 5552 | } |
| 5553 | |
| 5554 | __initcall(selinux_nf_ip_init); |
| 5555 | |
| 5556 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
| 5557 | static void selinux_nf_ip_exit(void) |
| 5558 | { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5559 | u32 iter; |
| 5560 | |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5561 | printk(KERN_DEBUG "SELinux: Unregistering netfilter hooks\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5562 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5563 | for (iter = 0; iter < ARRAY_SIZE(selinux_ipv4_ops); iter++) |
| 5564 | nf_unregister_hook(&selinux_ipv4_ops[iter]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5565 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5566 | for (iter = 0; iter < ARRAY_SIZE(selinux_ipv6_ops); iter++) |
| 5567 | nf_unregister_hook(&selinux_ipv6_ops[iter]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5568 | #endif /* IPV6 */ |
| 5569 | } |
| 5570 | #endif |
| 5571 | |
Stephen Smalley | c2b507f | 2006-02-04 23:27:50 -0800 | [diff] [blame] | 5572 | #else /* CONFIG_NETFILTER */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5573 | |
| 5574 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
| 5575 | #define selinux_nf_ip_exit() |
| 5576 | #endif |
| 5577 | |
Stephen Smalley | c2b507f | 2006-02-04 23:27:50 -0800 | [diff] [blame] | 5578 | #endif /* CONFIG_NETFILTER */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5579 | |
| 5580 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
| 5581 | int selinux_disable(void) |
| 5582 | { |
| 5583 | extern void exit_sel_fs(void); |
| 5584 | static int selinux_disabled = 0; |
| 5585 | |
| 5586 | if (ss_initialized) { |
| 5587 | /* Not permitted after initial policy load. */ |
| 5588 | return -EINVAL; |
| 5589 | } |
| 5590 | |
| 5591 | if (selinux_disabled) { |
| 5592 | /* Only do this once. */ |
| 5593 | return -EINVAL; |
| 5594 | } |
| 5595 | |
| 5596 | printk(KERN_INFO "SELinux: Disabled at runtime.\n"); |
| 5597 | |
| 5598 | selinux_disabled = 1; |
Stephen Smalley | 30d5528 | 2006-05-03 10:52:36 -0400 | [diff] [blame] | 5599 | selinux_enabled = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5600 | |
| 5601 | /* Reset security_ops to the secondary module, dummy or capability. */ |
| 5602 | security_ops = secondary_ops; |
| 5603 | |
| 5604 | /* Unregister netfilter hooks. */ |
| 5605 | selinux_nf_ip_exit(); |
| 5606 | |
| 5607 | /* Unregister selinuxfs. */ |
| 5608 | exit_sel_fs(); |
| 5609 | |
| 5610 | return 0; |
| 5611 | } |
| 5612 | #endif |
| 5613 | |
| 5614 | |