Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> | |
828dfe1d EP |
7 | * Chris Vance, <cvance@nai.com> |
8 | * Wayne Salamon, <wsalamon@nai.com> | |
9 | * James Morris <jmorris@redhat.com> | |
1da177e4 LT |
10 | * |
11 | * Copyright (C) 2001,2002 Networks Associates Technology, Inc. | |
2069f457 EP |
12 | * Copyright (C) 2003-2008 Red Hat, Inc., James Morris <jmorris@redhat.com> |
13 | * Eric Paris <eparis@redhat.com> | |
1da177e4 | 14 | * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc. |
828dfe1d | 15 | * <dgoeddel@trustedcs.com> |
effad8df | 16 | * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P. |
828dfe1d | 17 | * Paul Moore <paul.moore@hp.com> |
788e7dd4 | 18 | * Copyright (C) 2007 Hitachi Software Engineering Co., Ltd. |
828dfe1d | 19 | * Yuichi Nakamura <ynakam@hitachisoft.jp> |
1da177e4 LT |
20 | * |
21 | * This program is free software; you can redistribute it and/or modify | |
22 | * it under the terms of the GNU General Public License version 2, | |
828dfe1d | 23 | * as published by the Free Software Foundation. |
1da177e4 LT |
24 | */ |
25 | ||
1da177e4 LT |
26 | #include <linux/init.h> |
27 | #include <linux/kernel.h> | |
0d094efe | 28 | #include <linux/tracehook.h> |
1da177e4 LT |
29 | #include <linux/errno.h> |
30 | #include <linux/sched.h> | |
31 | #include <linux/security.h> | |
32 | #include <linux/xattr.h> | |
33 | #include <linux/capability.h> | |
34 | #include <linux/unistd.h> | |
35 | #include <linux/mm.h> | |
36 | #include <linux/mman.h> | |
37 | #include <linux/slab.h> | |
38 | #include <linux/pagemap.h> | |
39 | #include <linux/swap.h> | |
1da177e4 LT |
40 | #include <linux/spinlock.h> |
41 | #include <linux/syscalls.h> | |
42 | #include <linux/file.h> | |
9f3acc31 | 43 | #include <linux/fdtable.h> |
1da177e4 LT |
44 | #include <linux/namei.h> |
45 | #include <linux/mount.h> | |
1da177e4 | 46 | #include <linux/proc_fs.h> |
1da177e4 LT |
47 | #include <linux/netfilter_ipv4.h> |
48 | #include <linux/netfilter_ipv6.h> | |
49 | #include <linux/tty.h> | |
50 | #include <net/icmp.h> | |
227b60f5 | 51 | #include <net/ip.h> /* for local_port_range[] */ |
1da177e4 | 52 | #include <net/tcp.h> /* struct or_callable used in sock_rcv_skb */ |
220deb96 | 53 | #include <net/net_namespace.h> |
d621d35e | 54 | #include <net/netlabel.h> |
f5269710 | 55 | #include <linux/uaccess.h> |
1da177e4 | 56 | #include <asm/ioctls.h> |
d621d35e | 57 | #include <asm/atomic.h> |
1da177e4 LT |
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> | |
2ee92d46 | 64 | #include <linux/dccp.h> |
1da177e4 LT |
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> | |
6931dfc9 | 75 | #include <linux/string.h> |
877ce7c1 | 76 | #include <linux/selinux.h> |
23970741 | 77 | #include <linux/mutex.h> |
1da177e4 LT |
78 | |
79 | #include "avc.h" | |
80 | #include "objsec.h" | |
81 | #include "netif.h" | |
224dfbd8 | 82 | #include "netnode.h" |
3e112172 | 83 | #include "netport.h" |
d28d1e08 | 84 | #include "xfrm.h" |
c60475bf | 85 | #include "netlabel.h" |
9d57a7f9 | 86 | #include "audit.h" |
1da177e4 LT |
87 | |
88 | #define XATTR_SELINUX_SUFFIX "selinux" | |
89 | #define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX | |
90 | ||
c9180a57 EP |
91 | #define NUM_SEL_MNT_OPTS 4 |
92 | ||
1da177e4 LT |
93 | extern unsigned int policydb_loaded_version; |
94 | extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm); | |
4e5ab4cb | 95 | extern int selinux_compat_net; |
20510f2f | 96 | extern struct security_operations *security_ops; |
1da177e4 | 97 | |
d621d35e PM |
98 | /* SECMARK reference count */ |
99 | atomic_t selinux_secmark_refcount = ATOMIC_INIT(0); | |
100 | ||
1da177e4 | 101 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP |
828dfe1d | 102 | int selinux_enforcing; |
1da177e4 LT |
103 | |
104 | static int __init enforcing_setup(char *str) | |
105 | { | |
f5269710 EP |
106 | unsigned long enforcing; |
107 | if (!strict_strtoul(str, 0, &enforcing)) | |
108 | selinux_enforcing = enforcing ? 1 : 0; | |
1da177e4 LT |
109 | return 1; |
110 | } | |
111 | __setup("enforcing=", enforcing_setup); | |
112 | #endif | |
113 | ||
114 | #ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM | |
115 | int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE; | |
116 | ||
117 | static int __init selinux_enabled_setup(char *str) | |
118 | { | |
f5269710 EP |
119 | unsigned long enabled; |
120 | if (!strict_strtoul(str, 0, &enabled)) | |
121 | selinux_enabled = enabled ? 1 : 0; | |
1da177e4 LT |
122 | return 1; |
123 | } | |
124 | __setup("selinux=", selinux_enabled_setup); | |
30d55280 SS |
125 | #else |
126 | int selinux_enabled = 1; | |
1da177e4 LT |
127 | #endif |
128 | ||
1da177e4 | 129 | |
6f0f0fd4 JM |
130 | /* |
131 | * Minimal support for a secondary security module, | |
132 | * just to allow the use of the capability module. | |
133 | */ | |
828dfe1d | 134 | static struct security_operations *secondary_ops; |
1da177e4 LT |
135 | |
136 | /* Lists of inode and superblock security structures initialized | |
137 | before the policy was loaded. */ | |
138 | static LIST_HEAD(superblock_security_head); | |
139 | static DEFINE_SPINLOCK(sb_security_lock); | |
140 | ||
e18b890b | 141 | static struct kmem_cache *sel_inode_cache; |
7cae7e26 | 142 | |
d621d35e PM |
143 | /** |
144 | * selinux_secmark_enabled - Check to see if SECMARK is currently enabled | |
145 | * | |
146 | * Description: | |
147 | * This function checks the SECMARK reference counter to see if any SECMARK | |
148 | * targets are currently configured, if the reference counter is greater than | |
149 | * zero SECMARK is considered to be enabled. Returns true (1) if SECMARK is | |
150 | * enabled, false (0) if SECMARK is disabled. | |
151 | * | |
152 | */ | |
153 | static int selinux_secmark_enabled(void) | |
154 | { | |
155 | return (atomic_read(&selinux_secmark_refcount) > 0); | |
156 | } | |
157 | ||
1da177e4 LT |
158 | /* Allocate and free functions for each kind of security blob. */ |
159 | ||
160 | static int task_alloc_security(struct task_struct *task) | |
161 | { | |
162 | struct task_security_struct *tsec; | |
163 | ||
89d155ef | 164 | tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL); |
1da177e4 LT |
165 | if (!tsec) |
166 | return -ENOMEM; | |
167 | ||
0356357c | 168 | tsec->osid = tsec->sid = SECINITSID_UNLABELED; |
1da177e4 LT |
169 | task->security = tsec; |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
174 | static void task_free_security(struct task_struct *task) | |
175 | { | |
176 | struct task_security_struct *tsec = task->security; | |
1da177e4 LT |
177 | task->security = NULL; |
178 | kfree(tsec); | |
179 | } | |
180 | ||
181 | static int inode_alloc_security(struct inode *inode) | |
182 | { | |
183 | struct task_security_struct *tsec = current->security; | |
184 | struct inode_security_struct *isec; | |
185 | ||
a02fe132 | 186 | isec = kmem_cache_zalloc(sel_inode_cache, GFP_NOFS); |
1da177e4 LT |
187 | if (!isec) |
188 | return -ENOMEM; | |
189 | ||
23970741 | 190 | mutex_init(&isec->lock); |
1da177e4 | 191 | INIT_LIST_HEAD(&isec->list); |
1da177e4 LT |
192 | isec->inode = inode; |
193 | isec->sid = SECINITSID_UNLABELED; | |
194 | isec->sclass = SECCLASS_FILE; | |
9ac49d22 | 195 | isec->task_sid = tsec->sid; |
1da177e4 LT |
196 | inode->i_security = isec; |
197 | ||
198 | return 0; | |
199 | } | |
200 | ||
201 | static void inode_free_security(struct inode *inode) | |
202 | { | |
203 | struct inode_security_struct *isec = inode->i_security; | |
204 | struct superblock_security_struct *sbsec = inode->i_sb->s_security; | |
205 | ||
1da177e4 LT |
206 | spin_lock(&sbsec->isec_lock); |
207 | if (!list_empty(&isec->list)) | |
208 | list_del_init(&isec->list); | |
209 | spin_unlock(&sbsec->isec_lock); | |
210 | ||
211 | inode->i_security = NULL; | |
7cae7e26 | 212 | kmem_cache_free(sel_inode_cache, isec); |
1da177e4 LT |
213 | } |
214 | ||
215 | static int file_alloc_security(struct file *file) | |
216 | { | |
217 | struct task_security_struct *tsec = current->security; | |
218 | struct file_security_struct *fsec; | |
219 | ||
26d2a4be | 220 | fsec = kzalloc(sizeof(struct file_security_struct), GFP_KERNEL); |
1da177e4 LT |
221 | if (!fsec) |
222 | return -ENOMEM; | |
223 | ||
9ac49d22 SS |
224 | fsec->sid = tsec->sid; |
225 | fsec->fown_sid = tsec->sid; | |
1da177e4 LT |
226 | file->f_security = fsec; |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
231 | static void file_free_security(struct file *file) | |
232 | { | |
233 | struct file_security_struct *fsec = file->f_security; | |
1da177e4 LT |
234 | file->f_security = NULL; |
235 | kfree(fsec); | |
236 | } | |
237 | ||
238 | static int superblock_alloc_security(struct super_block *sb) | |
239 | { | |
240 | struct superblock_security_struct *sbsec; | |
241 | ||
89d155ef | 242 | sbsec = kzalloc(sizeof(struct superblock_security_struct), GFP_KERNEL); |
1da177e4 LT |
243 | if (!sbsec) |
244 | return -ENOMEM; | |
245 | ||
bc7e982b | 246 | mutex_init(&sbsec->lock); |
1da177e4 LT |
247 | INIT_LIST_HEAD(&sbsec->list); |
248 | INIT_LIST_HEAD(&sbsec->isec_head); | |
249 | spin_lock_init(&sbsec->isec_lock); | |
1da177e4 LT |
250 | sbsec->sb = sb; |
251 | sbsec->sid = SECINITSID_UNLABELED; | |
252 | sbsec->def_sid = SECINITSID_FILE; | |
c312feb2 | 253 | sbsec->mntpoint_sid = SECINITSID_UNLABELED; |
1da177e4 LT |
254 | sb->s_security = sbsec; |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
259 | static void superblock_free_security(struct super_block *sb) | |
260 | { | |
261 | struct superblock_security_struct *sbsec = sb->s_security; | |
262 | ||
1da177e4 LT |
263 | spin_lock(&sb_security_lock); |
264 | if (!list_empty(&sbsec->list)) | |
265 | list_del_init(&sbsec->list); | |
266 | spin_unlock(&sb_security_lock); | |
267 | ||
268 | sb->s_security = NULL; | |
269 | kfree(sbsec); | |
270 | } | |
271 | ||
7d877f3b | 272 | static int sk_alloc_security(struct sock *sk, int family, gfp_t priority) |
1da177e4 LT |
273 | { |
274 | struct sk_security_struct *ssec; | |
275 | ||
89d155ef | 276 | ssec = kzalloc(sizeof(*ssec), priority); |
1da177e4 LT |
277 | if (!ssec) |
278 | return -ENOMEM; | |
279 | ||
1da177e4 | 280 | ssec->peer_sid = SECINITSID_UNLABELED; |
892c141e | 281 | ssec->sid = SECINITSID_UNLABELED; |
1da177e4 LT |
282 | sk->sk_security = ssec; |
283 | ||
f74af6e8 | 284 | selinux_netlbl_sk_security_reset(ssec, family); |
99f59ed0 | 285 | |
1da177e4 LT |
286 | return 0; |
287 | } | |
288 | ||
289 | static void sk_free_security(struct sock *sk) | |
290 | { | |
291 | struct sk_security_struct *ssec = sk->sk_security; | |
292 | ||
1da177e4 | 293 | sk->sk_security = NULL; |
6c5b3fc0 | 294 | selinux_netlbl_sk_security_free(ssec); |
1da177e4 LT |
295 | kfree(ssec); |
296 | } | |
1da177e4 LT |
297 | |
298 | /* The security server must be initialized before | |
299 | any labeling or access decisions can be provided. */ | |
300 | extern int ss_initialized; | |
301 | ||
302 | /* The file system's label must be initialized prior to use. */ | |
303 | ||
304 | static char *labeling_behaviors[6] = { | |
305 | "uses xattr", | |
306 | "uses transition SIDs", | |
307 | "uses task SIDs", | |
308 | "uses genfs_contexts", | |
309 | "not configured for labeling", | |
310 | "uses mountpoint labeling", | |
311 | }; | |
312 | ||
313 | static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry); | |
314 | ||
315 | static inline int inode_doinit(struct inode *inode) | |
316 | { | |
317 | return inode_doinit_with_dentry(inode, NULL); | |
318 | } | |
319 | ||
320 | enum { | |
31e87930 | 321 | Opt_error = -1, |
1da177e4 LT |
322 | Opt_context = 1, |
323 | Opt_fscontext = 2, | |
c9180a57 EP |
324 | Opt_defcontext = 3, |
325 | Opt_rootcontext = 4, | |
1da177e4 LT |
326 | }; |
327 | ||
a447c093 | 328 | static const match_table_t tokens = { |
832cbd9a EP |
329 | {Opt_context, CONTEXT_STR "%s"}, |
330 | {Opt_fscontext, FSCONTEXT_STR "%s"}, | |
331 | {Opt_defcontext, DEFCONTEXT_STR "%s"}, | |
332 | {Opt_rootcontext, ROOTCONTEXT_STR "%s"}, | |
31e87930 | 333 | {Opt_error, NULL}, |
1da177e4 LT |
334 | }; |
335 | ||
336 | #define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n" | |
337 | ||
c312feb2 EP |
338 | static int may_context_mount_sb_relabel(u32 sid, |
339 | struct superblock_security_struct *sbsec, | |
340 | struct task_security_struct *tsec) | |
341 | { | |
342 | int rc; | |
343 | ||
344 | rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, | |
345 | FILESYSTEM__RELABELFROM, NULL); | |
346 | if (rc) | |
347 | return rc; | |
348 | ||
349 | rc = avc_has_perm(tsec->sid, sid, SECCLASS_FILESYSTEM, | |
350 | FILESYSTEM__RELABELTO, NULL); | |
351 | return rc; | |
352 | } | |
353 | ||
0808925e EP |
354 | static int may_context_mount_inode_relabel(u32 sid, |
355 | struct superblock_security_struct *sbsec, | |
356 | struct task_security_struct *tsec) | |
357 | { | |
358 | int rc; | |
359 | rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, | |
360 | FILESYSTEM__RELABELFROM, NULL); | |
361 | if (rc) | |
362 | return rc; | |
363 | ||
364 | rc = avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, | |
365 | FILESYSTEM__ASSOCIATE, NULL); | |
366 | return rc; | |
367 | } | |
368 | ||
c9180a57 | 369 | static int sb_finish_set_opts(struct super_block *sb) |
1da177e4 | 370 | { |
1da177e4 | 371 | struct superblock_security_struct *sbsec = sb->s_security; |
c9180a57 EP |
372 | struct dentry *root = sb->s_root; |
373 | struct inode *root_inode = root->d_inode; | |
374 | int rc = 0; | |
1da177e4 | 375 | |
c9180a57 EP |
376 | if (sbsec->behavior == SECURITY_FS_USE_XATTR) { |
377 | /* Make sure that the xattr handler exists and that no | |
378 | error other than -ENODATA is returned by getxattr on | |
379 | the root directory. -ENODATA is ok, as this may be | |
380 | the first boot of the SELinux kernel before we have | |
381 | assigned xattr values to the filesystem. */ | |
382 | if (!root_inode->i_op->getxattr) { | |
383 | printk(KERN_WARNING "SELinux: (dev %s, type %s) has no " | |
384 | "xattr support\n", sb->s_id, sb->s_type->name); | |
385 | rc = -EOPNOTSUPP; | |
386 | goto out; | |
387 | } | |
388 | rc = root_inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0); | |
389 | if (rc < 0 && rc != -ENODATA) { | |
390 | if (rc == -EOPNOTSUPP) | |
391 | printk(KERN_WARNING "SELinux: (dev %s, type " | |
392 | "%s) has no security xattr handler\n", | |
393 | sb->s_id, sb->s_type->name); | |
394 | else | |
395 | printk(KERN_WARNING "SELinux: (dev %s, type " | |
396 | "%s) getxattr errno %d\n", sb->s_id, | |
397 | sb->s_type->name, -rc); | |
398 | goto out; | |
399 | } | |
400 | } | |
1da177e4 | 401 | |
c9180a57 | 402 | sbsec->initialized = 1; |
1da177e4 | 403 | |
c9180a57 EP |
404 | if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors)) |
405 | printk(KERN_ERR "SELinux: initialized (dev %s, type %s), unknown behavior\n", | |
406 | sb->s_id, sb->s_type->name); | |
407 | else | |
408 | printk(KERN_DEBUG "SELinux: initialized (dev %s, type %s), %s\n", | |
409 | sb->s_id, sb->s_type->name, | |
410 | labeling_behaviors[sbsec->behavior-1]); | |
1da177e4 | 411 | |
c9180a57 EP |
412 | /* Initialize the root inode. */ |
413 | rc = inode_doinit_with_dentry(root_inode, root); | |
1da177e4 | 414 | |
c9180a57 EP |
415 | /* Initialize any other inodes associated with the superblock, e.g. |
416 | inodes created prior to initial policy load or inodes created | |
417 | during get_sb by a pseudo filesystem that directly | |
418 | populates itself. */ | |
419 | spin_lock(&sbsec->isec_lock); | |
420 | next_inode: | |
421 | if (!list_empty(&sbsec->isec_head)) { | |
422 | struct inode_security_struct *isec = | |
423 | list_entry(sbsec->isec_head.next, | |
424 | struct inode_security_struct, list); | |
425 | struct inode *inode = isec->inode; | |
426 | spin_unlock(&sbsec->isec_lock); | |
427 | inode = igrab(inode); | |
428 | if (inode) { | |
429 | if (!IS_PRIVATE(inode)) | |
430 | inode_doinit(inode); | |
431 | iput(inode); | |
432 | } | |
433 | spin_lock(&sbsec->isec_lock); | |
434 | list_del_init(&isec->list); | |
435 | goto next_inode; | |
436 | } | |
437 | spin_unlock(&sbsec->isec_lock); | |
438 | out: | |
439 | return rc; | |
440 | } | |
1da177e4 | 441 | |
c9180a57 EP |
442 | /* |
443 | * This function should allow an FS to ask what it's mount security | |
444 | * options were so it can use those later for submounts, displaying | |
445 | * mount options, or whatever. | |
446 | */ | |
447 | static int selinux_get_mnt_opts(const struct super_block *sb, | |
e0007529 | 448 | struct security_mnt_opts *opts) |
c9180a57 EP |
449 | { |
450 | int rc = 0, i; | |
451 | struct superblock_security_struct *sbsec = sb->s_security; | |
452 | char *context = NULL; | |
453 | u32 len; | |
454 | char tmp; | |
1da177e4 | 455 | |
e0007529 | 456 | security_init_mnt_opts(opts); |
1da177e4 | 457 | |
c9180a57 EP |
458 | if (!sbsec->initialized) |
459 | return -EINVAL; | |
1da177e4 | 460 | |
c9180a57 EP |
461 | if (!ss_initialized) |
462 | return -EINVAL; | |
1da177e4 | 463 | |
c9180a57 EP |
464 | /* |
465 | * if we ever use sbsec flags for anything other than tracking mount | |
466 | * settings this is going to need a mask | |
467 | */ | |
468 | tmp = sbsec->flags; | |
469 | /* count the number of mount options for this sb */ | |
470 | for (i = 0; i < 8; i++) { | |
471 | if (tmp & 0x01) | |
e0007529 | 472 | opts->num_mnt_opts++; |
c9180a57 EP |
473 | tmp >>= 1; |
474 | } | |
1da177e4 | 475 | |
e0007529 EP |
476 | opts->mnt_opts = kcalloc(opts->num_mnt_opts, sizeof(char *), GFP_ATOMIC); |
477 | if (!opts->mnt_opts) { | |
c9180a57 EP |
478 | rc = -ENOMEM; |
479 | goto out_free; | |
480 | } | |
1da177e4 | 481 | |
e0007529 EP |
482 | opts->mnt_opts_flags = kcalloc(opts->num_mnt_opts, sizeof(int), GFP_ATOMIC); |
483 | if (!opts->mnt_opts_flags) { | |
c9180a57 EP |
484 | rc = -ENOMEM; |
485 | goto out_free; | |
486 | } | |
1da177e4 | 487 | |
c9180a57 EP |
488 | i = 0; |
489 | if (sbsec->flags & FSCONTEXT_MNT) { | |
490 | rc = security_sid_to_context(sbsec->sid, &context, &len); | |
491 | if (rc) | |
492 | goto out_free; | |
e0007529 EP |
493 | opts->mnt_opts[i] = context; |
494 | opts->mnt_opts_flags[i++] = FSCONTEXT_MNT; | |
c9180a57 EP |
495 | } |
496 | if (sbsec->flags & CONTEXT_MNT) { | |
497 | rc = security_sid_to_context(sbsec->mntpoint_sid, &context, &len); | |
498 | if (rc) | |
499 | goto out_free; | |
e0007529 EP |
500 | opts->mnt_opts[i] = context; |
501 | opts->mnt_opts_flags[i++] = CONTEXT_MNT; | |
c9180a57 EP |
502 | } |
503 | if (sbsec->flags & DEFCONTEXT_MNT) { | |
504 | rc = security_sid_to_context(sbsec->def_sid, &context, &len); | |
505 | if (rc) | |
506 | goto out_free; | |
e0007529 EP |
507 | opts->mnt_opts[i] = context; |
508 | opts->mnt_opts_flags[i++] = DEFCONTEXT_MNT; | |
c9180a57 EP |
509 | } |
510 | if (sbsec->flags & ROOTCONTEXT_MNT) { | |
511 | struct inode *root = sbsec->sb->s_root->d_inode; | |
512 | struct inode_security_struct *isec = root->i_security; | |
0808925e | 513 | |
c9180a57 EP |
514 | rc = security_sid_to_context(isec->sid, &context, &len); |
515 | if (rc) | |
516 | goto out_free; | |
e0007529 EP |
517 | opts->mnt_opts[i] = context; |
518 | opts->mnt_opts_flags[i++] = ROOTCONTEXT_MNT; | |
c9180a57 | 519 | } |
1da177e4 | 520 | |
e0007529 | 521 | BUG_ON(i != opts->num_mnt_opts); |
1da177e4 | 522 | |
c9180a57 EP |
523 | return 0; |
524 | ||
525 | out_free: | |
e0007529 | 526 | security_free_mnt_opts(opts); |
c9180a57 EP |
527 | return rc; |
528 | } | |
1da177e4 | 529 | |
c9180a57 EP |
530 | static int bad_option(struct superblock_security_struct *sbsec, char flag, |
531 | u32 old_sid, u32 new_sid) | |
532 | { | |
533 | /* check if the old mount command had the same options */ | |
534 | if (sbsec->initialized) | |
535 | if (!(sbsec->flags & flag) || | |
536 | (old_sid != new_sid)) | |
537 | return 1; | |
538 | ||
539 | /* check if we were passed the same options twice, | |
540 | * aka someone passed context=a,context=b | |
541 | */ | |
542 | if (!sbsec->initialized) | |
543 | if (sbsec->flags & flag) | |
544 | return 1; | |
545 | return 0; | |
546 | } | |
e0007529 | 547 | |
c9180a57 EP |
548 | /* |
549 | * Allow filesystems with binary mount data to explicitly set mount point | |
550 | * labeling information. | |
551 | */ | |
e0007529 EP |
552 | static int selinux_set_mnt_opts(struct super_block *sb, |
553 | struct security_mnt_opts *opts) | |
c9180a57 EP |
554 | { |
555 | int rc = 0, i; | |
556 | struct task_security_struct *tsec = current->security; | |
557 | struct superblock_security_struct *sbsec = sb->s_security; | |
558 | const char *name = sb->s_type->name; | |
089be43e JM |
559 | struct inode *inode = sbsec->sb->s_root->d_inode; |
560 | struct inode_security_struct *root_isec = inode->i_security; | |
c9180a57 EP |
561 | u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0; |
562 | u32 defcontext_sid = 0; | |
e0007529 EP |
563 | char **mount_options = opts->mnt_opts; |
564 | int *flags = opts->mnt_opts_flags; | |
565 | int num_opts = opts->num_mnt_opts; | |
c9180a57 EP |
566 | |
567 | mutex_lock(&sbsec->lock); | |
568 | ||
569 | if (!ss_initialized) { | |
570 | if (!num_opts) { | |
571 | /* Defer initialization until selinux_complete_init, | |
572 | after the initial policy is loaded and the security | |
573 | server is ready to handle calls. */ | |
574 | spin_lock(&sb_security_lock); | |
575 | if (list_empty(&sbsec->list)) | |
576 | list_add(&sbsec->list, &superblock_security_head); | |
577 | spin_unlock(&sb_security_lock); | |
578 | goto out; | |
579 | } | |
580 | rc = -EINVAL; | |
744ba35e EP |
581 | printk(KERN_WARNING "SELinux: Unable to set superblock options " |
582 | "before the security server is initialized\n"); | |
1da177e4 | 583 | goto out; |
c9180a57 | 584 | } |
1da177e4 | 585 | |
e0007529 EP |
586 | /* |
587 | * Binary mount data FS will come through this function twice. Once | |
588 | * from an explicit call and once from the generic calls from the vfs. | |
589 | * Since the generic VFS calls will not contain any security mount data | |
590 | * we need to skip the double mount verification. | |
591 | * | |
592 | * This does open a hole in which we will not notice if the first | |
593 | * mount using this sb set explict options and a second mount using | |
594 | * this sb does not set any security options. (The first options | |
595 | * will be used for both mounts) | |
596 | */ | |
597 | if (sbsec->initialized && (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) | |
598 | && (num_opts == 0)) | |
f5269710 | 599 | goto out; |
e0007529 | 600 | |
c9180a57 EP |
601 | /* |
602 | * parse the mount options, check if they are valid sids. | |
603 | * also check if someone is trying to mount the same sb more | |
604 | * than once with different security options. | |
605 | */ | |
606 | for (i = 0; i < num_opts; i++) { | |
607 | u32 sid; | |
608 | rc = security_context_to_sid(mount_options[i], | |
609 | strlen(mount_options[i]), &sid); | |
1da177e4 LT |
610 | if (rc) { |
611 | printk(KERN_WARNING "SELinux: security_context_to_sid" | |
612 | "(%s) failed for (dev %s, type %s) errno=%d\n", | |
c9180a57 EP |
613 | mount_options[i], sb->s_id, name, rc); |
614 | goto out; | |
615 | } | |
616 | switch (flags[i]) { | |
617 | case FSCONTEXT_MNT: | |
618 | fscontext_sid = sid; | |
619 | ||
620 | if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, | |
621 | fscontext_sid)) | |
622 | goto out_double_mount; | |
623 | ||
624 | sbsec->flags |= FSCONTEXT_MNT; | |
625 | break; | |
626 | case CONTEXT_MNT: | |
627 | context_sid = sid; | |
628 | ||
629 | if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, | |
630 | context_sid)) | |
631 | goto out_double_mount; | |
632 | ||
633 | sbsec->flags |= CONTEXT_MNT; | |
634 | break; | |
635 | case ROOTCONTEXT_MNT: | |
636 | rootcontext_sid = sid; | |
637 | ||
638 | if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, | |
639 | rootcontext_sid)) | |
640 | goto out_double_mount; | |
641 | ||
642 | sbsec->flags |= ROOTCONTEXT_MNT; | |
643 | ||
644 | break; | |
645 | case DEFCONTEXT_MNT: | |
646 | defcontext_sid = sid; | |
647 | ||
648 | if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, | |
649 | defcontext_sid)) | |
650 | goto out_double_mount; | |
651 | ||
652 | sbsec->flags |= DEFCONTEXT_MNT; | |
653 | ||
654 | break; | |
655 | default: | |
656 | rc = -EINVAL; | |
657 | goto out; | |
1da177e4 | 658 | } |
c9180a57 EP |
659 | } |
660 | ||
661 | if (sbsec->initialized) { | |
662 | /* previously mounted with options, but not on this attempt? */ | |
663 | if (sbsec->flags && !num_opts) | |
664 | goto out_double_mount; | |
665 | rc = 0; | |
666 | goto out; | |
667 | } | |
668 | ||
089be43e | 669 | if (strcmp(sb->s_type->name, "proc") == 0) |
c9180a57 EP |
670 | sbsec->proc = 1; |
671 | ||
672 | /* Determine the labeling behavior to use for this filesystem type. */ | |
089be43e | 673 | rc = security_fs_use(sb->s_type->name, &sbsec->behavior, &sbsec->sid); |
c9180a57 EP |
674 | if (rc) { |
675 | printk(KERN_WARNING "%s: security_fs_use(%s) returned %d\n", | |
089be43e | 676 | __func__, sb->s_type->name, rc); |
c9180a57 EP |
677 | goto out; |
678 | } | |
1da177e4 | 679 | |
c9180a57 EP |
680 | /* sets the context of the superblock for the fs being mounted. */ |
681 | if (fscontext_sid) { | |
682 | ||
683 | rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, tsec); | |
1da177e4 | 684 | if (rc) |
c9180a57 | 685 | goto out; |
1da177e4 | 686 | |
c9180a57 | 687 | sbsec->sid = fscontext_sid; |
c312feb2 EP |
688 | } |
689 | ||
690 | /* | |
691 | * Switch to using mount point labeling behavior. | |
692 | * sets the label used on all file below the mountpoint, and will set | |
693 | * the superblock context if not already set. | |
694 | */ | |
c9180a57 EP |
695 | if (context_sid) { |
696 | if (!fscontext_sid) { | |
697 | rc = may_context_mount_sb_relabel(context_sid, sbsec, tsec); | |
b04ea3ce | 698 | if (rc) |
c9180a57 EP |
699 | goto out; |
700 | sbsec->sid = context_sid; | |
b04ea3ce | 701 | } else { |
c9180a57 | 702 | rc = may_context_mount_inode_relabel(context_sid, sbsec, tsec); |
b04ea3ce | 703 | if (rc) |
c9180a57 | 704 | goto out; |
b04ea3ce | 705 | } |
c9180a57 EP |
706 | if (!rootcontext_sid) |
707 | rootcontext_sid = context_sid; | |
1da177e4 | 708 | |
c9180a57 | 709 | sbsec->mntpoint_sid = context_sid; |
c312feb2 | 710 | sbsec->behavior = SECURITY_FS_USE_MNTPOINT; |
1da177e4 LT |
711 | } |
712 | ||
c9180a57 EP |
713 | if (rootcontext_sid) { |
714 | rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec, tsec); | |
0808925e | 715 | if (rc) |
c9180a57 | 716 | goto out; |
0808925e | 717 | |
c9180a57 EP |
718 | root_isec->sid = rootcontext_sid; |
719 | root_isec->initialized = 1; | |
0808925e EP |
720 | } |
721 | ||
c9180a57 EP |
722 | if (defcontext_sid) { |
723 | if (sbsec->behavior != SECURITY_FS_USE_XATTR) { | |
724 | rc = -EINVAL; | |
725 | printk(KERN_WARNING "SELinux: defcontext option is " | |
726 | "invalid for this filesystem type\n"); | |
727 | goto out; | |
1da177e4 LT |
728 | } |
729 | ||
c9180a57 EP |
730 | if (defcontext_sid != sbsec->def_sid) { |
731 | rc = may_context_mount_inode_relabel(defcontext_sid, | |
732 | sbsec, tsec); | |
733 | if (rc) | |
734 | goto out; | |
735 | } | |
1da177e4 | 736 | |
c9180a57 | 737 | sbsec->def_sid = defcontext_sid; |
1da177e4 LT |
738 | } |
739 | ||
c9180a57 | 740 | rc = sb_finish_set_opts(sb); |
1da177e4 | 741 | out: |
c9180a57 | 742 | mutex_unlock(&sbsec->lock); |
1da177e4 | 743 | return rc; |
c9180a57 EP |
744 | out_double_mount: |
745 | rc = -EINVAL; | |
746 | printk(KERN_WARNING "SELinux: mount invalid. Same superblock, different " | |
747 | "security settings for (dev %s, type %s)\n", sb->s_id, name); | |
748 | goto out; | |
1da177e4 LT |
749 | } |
750 | ||
c9180a57 EP |
751 | static void selinux_sb_clone_mnt_opts(const struct super_block *oldsb, |
752 | struct super_block *newsb) | |
1da177e4 | 753 | { |
c9180a57 EP |
754 | const struct superblock_security_struct *oldsbsec = oldsb->s_security; |
755 | struct superblock_security_struct *newsbsec = newsb->s_security; | |
1da177e4 | 756 | |
c9180a57 EP |
757 | int set_fscontext = (oldsbsec->flags & FSCONTEXT_MNT); |
758 | int set_context = (oldsbsec->flags & CONTEXT_MNT); | |
759 | int set_rootcontext = (oldsbsec->flags & ROOTCONTEXT_MNT); | |
1da177e4 | 760 | |
0f5e6420 EP |
761 | /* |
762 | * if the parent was able to be mounted it clearly had no special lsm | |
763 | * mount options. thus we can safely put this sb on the list and deal | |
764 | * with it later | |
765 | */ | |
766 | if (!ss_initialized) { | |
767 | spin_lock(&sb_security_lock); | |
768 | if (list_empty(&newsbsec->list)) | |
769 | list_add(&newsbsec->list, &superblock_security_head); | |
770 | spin_unlock(&sb_security_lock); | |
771 | return; | |
772 | } | |
c9180a57 | 773 | |
c9180a57 EP |
774 | /* how can we clone if the old one wasn't set up?? */ |
775 | BUG_ON(!oldsbsec->initialized); | |
776 | ||
5a552617 EP |
777 | /* if fs is reusing a sb, just let its options stand... */ |
778 | if (newsbsec->initialized) | |
779 | return; | |
780 | ||
c9180a57 EP |
781 | mutex_lock(&newsbsec->lock); |
782 | ||
783 | newsbsec->flags = oldsbsec->flags; | |
784 | ||
785 | newsbsec->sid = oldsbsec->sid; | |
786 | newsbsec->def_sid = oldsbsec->def_sid; | |
787 | newsbsec->behavior = oldsbsec->behavior; | |
788 | ||
789 | if (set_context) { | |
790 | u32 sid = oldsbsec->mntpoint_sid; | |
791 | ||
792 | if (!set_fscontext) | |
793 | newsbsec->sid = sid; | |
794 | if (!set_rootcontext) { | |
795 | struct inode *newinode = newsb->s_root->d_inode; | |
796 | struct inode_security_struct *newisec = newinode->i_security; | |
797 | newisec->sid = sid; | |
798 | } | |
799 | newsbsec->mntpoint_sid = sid; | |
1da177e4 | 800 | } |
c9180a57 EP |
801 | if (set_rootcontext) { |
802 | const struct inode *oldinode = oldsb->s_root->d_inode; | |
803 | const struct inode_security_struct *oldisec = oldinode->i_security; | |
804 | struct inode *newinode = newsb->s_root->d_inode; | |
805 | struct inode_security_struct *newisec = newinode->i_security; | |
1da177e4 | 806 | |
c9180a57 | 807 | newisec->sid = oldisec->sid; |
1da177e4 LT |
808 | } |
809 | ||
c9180a57 EP |
810 | sb_finish_set_opts(newsb); |
811 | mutex_unlock(&newsbsec->lock); | |
812 | } | |
813 | ||
2e1479d9 AB |
814 | static int selinux_parse_opts_str(char *options, |
815 | struct security_mnt_opts *opts) | |
c9180a57 | 816 | { |
e0007529 | 817 | char *p; |
c9180a57 EP |
818 | char *context = NULL, *defcontext = NULL; |
819 | char *fscontext = NULL, *rootcontext = NULL; | |
e0007529 | 820 | int rc, num_mnt_opts = 0; |
1da177e4 | 821 | |
e0007529 | 822 | opts->num_mnt_opts = 0; |
1da177e4 | 823 | |
c9180a57 EP |
824 | /* Standard string-based options. */ |
825 | while ((p = strsep(&options, "|")) != NULL) { | |
826 | int token; | |
827 | substring_t args[MAX_OPT_ARGS]; | |
1da177e4 | 828 | |
c9180a57 EP |
829 | if (!*p) |
830 | continue; | |
1da177e4 | 831 | |
c9180a57 | 832 | token = match_token(p, tokens, args); |
1da177e4 | 833 | |
c9180a57 EP |
834 | switch (token) { |
835 | case Opt_context: | |
836 | if (context || defcontext) { | |
837 | rc = -EINVAL; | |
838 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); | |
839 | goto out_err; | |
840 | } | |
841 | context = match_strdup(&args[0]); | |
842 | if (!context) { | |
843 | rc = -ENOMEM; | |
844 | goto out_err; | |
845 | } | |
846 | break; | |
847 | ||
848 | case Opt_fscontext: | |
849 | if (fscontext) { | |
850 | rc = -EINVAL; | |
851 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); | |
852 | goto out_err; | |
853 | } | |
854 | fscontext = match_strdup(&args[0]); | |
855 | if (!fscontext) { | |
856 | rc = -ENOMEM; | |
857 | goto out_err; | |
858 | } | |
859 | break; | |
860 | ||
861 | case Opt_rootcontext: | |
862 | if (rootcontext) { | |
863 | rc = -EINVAL; | |
864 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); | |
865 | goto out_err; | |
866 | } | |
867 | rootcontext = match_strdup(&args[0]); | |
868 | if (!rootcontext) { | |
869 | rc = -ENOMEM; | |
870 | goto out_err; | |
871 | } | |
872 | break; | |
873 | ||
874 | case Opt_defcontext: | |
875 | if (context || defcontext) { | |
876 | rc = -EINVAL; | |
877 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); | |
878 | goto out_err; | |
879 | } | |
880 | defcontext = match_strdup(&args[0]); | |
881 | if (!defcontext) { | |
882 | rc = -ENOMEM; | |
883 | goto out_err; | |
884 | } | |
885 | break; | |
886 | ||
887 | default: | |
888 | rc = -EINVAL; | |
889 | printk(KERN_WARNING "SELinux: unknown mount option\n"); | |
890 | goto out_err; | |
1da177e4 | 891 | |
1da177e4 | 892 | } |
1da177e4 | 893 | } |
c9180a57 | 894 | |
e0007529 EP |
895 | rc = -ENOMEM; |
896 | opts->mnt_opts = kcalloc(NUM_SEL_MNT_OPTS, sizeof(char *), GFP_ATOMIC); | |
897 | if (!opts->mnt_opts) | |
898 | goto out_err; | |
899 | ||
900 | opts->mnt_opts_flags = kcalloc(NUM_SEL_MNT_OPTS, sizeof(int), GFP_ATOMIC); | |
901 | if (!opts->mnt_opts_flags) { | |
902 | kfree(opts->mnt_opts); | |
903 | goto out_err; | |
904 | } | |
905 | ||
c9180a57 | 906 | if (fscontext) { |
e0007529 EP |
907 | opts->mnt_opts[num_mnt_opts] = fscontext; |
908 | opts->mnt_opts_flags[num_mnt_opts++] = FSCONTEXT_MNT; | |
c9180a57 EP |
909 | } |
910 | if (context) { | |
e0007529 EP |
911 | opts->mnt_opts[num_mnt_opts] = context; |
912 | opts->mnt_opts_flags[num_mnt_opts++] = CONTEXT_MNT; | |
c9180a57 EP |
913 | } |
914 | if (rootcontext) { | |
e0007529 EP |
915 | opts->mnt_opts[num_mnt_opts] = rootcontext; |
916 | opts->mnt_opts_flags[num_mnt_opts++] = ROOTCONTEXT_MNT; | |
c9180a57 EP |
917 | } |
918 | if (defcontext) { | |
e0007529 EP |
919 | opts->mnt_opts[num_mnt_opts] = defcontext; |
920 | opts->mnt_opts_flags[num_mnt_opts++] = DEFCONTEXT_MNT; | |
c9180a57 EP |
921 | } |
922 | ||
e0007529 EP |
923 | opts->num_mnt_opts = num_mnt_opts; |
924 | return 0; | |
925 | ||
c9180a57 EP |
926 | out_err: |
927 | kfree(context); | |
928 | kfree(defcontext); | |
929 | kfree(fscontext); | |
930 | kfree(rootcontext); | |
1da177e4 LT |
931 | return rc; |
932 | } | |
e0007529 EP |
933 | /* |
934 | * string mount options parsing and call set the sbsec | |
935 | */ | |
936 | static int superblock_doinit(struct super_block *sb, void *data) | |
937 | { | |
938 | int rc = 0; | |
939 | char *options = data; | |
940 | struct security_mnt_opts opts; | |
941 | ||
942 | security_init_mnt_opts(&opts); | |
943 | ||
944 | if (!data) | |
945 | goto out; | |
946 | ||
947 | BUG_ON(sb->s_type->fs_flags & FS_BINARY_MOUNTDATA); | |
948 | ||
949 | rc = selinux_parse_opts_str(options, &opts); | |
950 | if (rc) | |
951 | goto out_err; | |
952 | ||
953 | out: | |
954 | rc = selinux_set_mnt_opts(sb, &opts); | |
955 | ||
956 | out_err: | |
957 | security_free_mnt_opts(&opts); | |
958 | return rc; | |
959 | } | |
1da177e4 | 960 | |
3583a711 AB |
961 | static void selinux_write_opts(struct seq_file *m, |
962 | struct security_mnt_opts *opts) | |
2069f457 EP |
963 | { |
964 | int i; | |
965 | char *prefix; | |
966 | ||
967 | for (i = 0; i < opts->num_mnt_opts; i++) { | |
968 | char *has_comma = strchr(opts->mnt_opts[i], ','); | |
969 | ||
970 | switch (opts->mnt_opts_flags[i]) { | |
971 | case CONTEXT_MNT: | |
972 | prefix = CONTEXT_STR; | |
973 | break; | |
974 | case FSCONTEXT_MNT: | |
975 | prefix = FSCONTEXT_STR; | |
976 | break; | |
977 | case ROOTCONTEXT_MNT: | |
978 | prefix = ROOTCONTEXT_STR; | |
979 | break; | |
980 | case DEFCONTEXT_MNT: | |
981 | prefix = DEFCONTEXT_STR; | |
982 | break; | |
983 | default: | |
984 | BUG(); | |
985 | }; | |
986 | /* we need a comma before each option */ | |
987 | seq_putc(m, ','); | |
988 | seq_puts(m, prefix); | |
989 | if (has_comma) | |
990 | seq_putc(m, '\"'); | |
991 | seq_puts(m, opts->mnt_opts[i]); | |
992 | if (has_comma) | |
993 | seq_putc(m, '\"'); | |
994 | } | |
995 | } | |
996 | ||
997 | static int selinux_sb_show_options(struct seq_file *m, struct super_block *sb) | |
998 | { | |
999 | struct security_mnt_opts opts; | |
1000 | int rc; | |
1001 | ||
1002 | rc = selinux_get_mnt_opts(sb, &opts); | |
383795c2 EP |
1003 | if (rc) { |
1004 | /* before policy load we may get EINVAL, don't show anything */ | |
1005 | if (rc == -EINVAL) | |
1006 | rc = 0; | |
2069f457 | 1007 | return rc; |
383795c2 | 1008 | } |
2069f457 EP |
1009 | |
1010 | selinux_write_opts(m, &opts); | |
1011 | ||
1012 | security_free_mnt_opts(&opts); | |
1013 | ||
1014 | return rc; | |
1015 | } | |
1016 | ||
1da177e4 LT |
1017 | static inline u16 inode_mode_to_security_class(umode_t mode) |
1018 | { | |
1019 | switch (mode & S_IFMT) { | |
1020 | case S_IFSOCK: | |
1021 | return SECCLASS_SOCK_FILE; | |
1022 | case S_IFLNK: | |
1023 | return SECCLASS_LNK_FILE; | |
1024 | case S_IFREG: | |
1025 | return SECCLASS_FILE; | |
1026 | case S_IFBLK: | |
1027 | return SECCLASS_BLK_FILE; | |
1028 | case S_IFDIR: | |
1029 | return SECCLASS_DIR; | |
1030 | case S_IFCHR: | |
1031 | return SECCLASS_CHR_FILE; | |
1032 | case S_IFIFO: | |
1033 | return SECCLASS_FIFO_FILE; | |
1034 | ||
1035 | } | |
1036 | ||
1037 | return SECCLASS_FILE; | |
1038 | } | |
1039 | ||
13402580 JM |
1040 | static inline int default_protocol_stream(int protocol) |
1041 | { | |
1042 | return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP); | |
1043 | } | |
1044 | ||
1045 | static inline int default_protocol_dgram(int protocol) | |
1046 | { | |
1047 | return (protocol == IPPROTO_IP || protocol == IPPROTO_UDP); | |
1048 | } | |
1049 | ||
1da177e4 LT |
1050 | static inline u16 socket_type_to_security_class(int family, int type, int protocol) |
1051 | { | |
1052 | switch (family) { | |
1053 | case PF_UNIX: | |
1054 | switch (type) { | |
1055 | case SOCK_STREAM: | |
1056 | case SOCK_SEQPACKET: | |
1057 | return SECCLASS_UNIX_STREAM_SOCKET; | |
1058 | case SOCK_DGRAM: | |
1059 | return SECCLASS_UNIX_DGRAM_SOCKET; | |
1060 | } | |
1061 | break; | |
1062 | case PF_INET: | |
1063 | case PF_INET6: | |
1064 | switch (type) { | |
1065 | case SOCK_STREAM: | |
13402580 JM |
1066 | if (default_protocol_stream(protocol)) |
1067 | return SECCLASS_TCP_SOCKET; | |
1068 | else | |
1069 | return SECCLASS_RAWIP_SOCKET; | |
1da177e4 | 1070 | case SOCK_DGRAM: |
13402580 JM |
1071 | if (default_protocol_dgram(protocol)) |
1072 | return SECCLASS_UDP_SOCKET; | |
1073 | else | |
1074 | return SECCLASS_RAWIP_SOCKET; | |
2ee92d46 JM |
1075 | case SOCK_DCCP: |
1076 | return SECCLASS_DCCP_SOCKET; | |
13402580 | 1077 | default: |
1da177e4 LT |
1078 | return SECCLASS_RAWIP_SOCKET; |
1079 | } | |
1080 | break; | |
1081 | case PF_NETLINK: | |
1082 | switch (protocol) { | |
1083 | case NETLINK_ROUTE: | |
1084 | return SECCLASS_NETLINK_ROUTE_SOCKET; | |
1085 | case NETLINK_FIREWALL: | |
1086 | return SECCLASS_NETLINK_FIREWALL_SOCKET; | |
216efaaa | 1087 | case NETLINK_INET_DIAG: |
1da177e4 LT |
1088 | return SECCLASS_NETLINK_TCPDIAG_SOCKET; |
1089 | case NETLINK_NFLOG: | |
1090 | return SECCLASS_NETLINK_NFLOG_SOCKET; | |
1091 | case NETLINK_XFRM: | |
1092 | return SECCLASS_NETLINK_XFRM_SOCKET; | |
1093 | case NETLINK_SELINUX: | |
1094 | return SECCLASS_NETLINK_SELINUX_SOCKET; | |
1095 | case NETLINK_AUDIT: | |
1096 | return SECCLASS_NETLINK_AUDIT_SOCKET; | |
1097 | case NETLINK_IP6_FW: | |
1098 | return SECCLASS_NETLINK_IP6FW_SOCKET; | |
1099 | case NETLINK_DNRTMSG: | |
1100 | return SECCLASS_NETLINK_DNRT_SOCKET; | |
0c9b7942 JM |
1101 | case NETLINK_KOBJECT_UEVENT: |
1102 | return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET; | |
1da177e4 LT |
1103 | default: |
1104 | return SECCLASS_NETLINK_SOCKET; | |
1105 | } | |
1106 | case PF_PACKET: | |
1107 | return SECCLASS_PACKET_SOCKET; | |
1108 | case PF_KEY: | |
1109 | return SECCLASS_KEY_SOCKET; | |
3e3ff15e CP |
1110 | case PF_APPLETALK: |
1111 | return SECCLASS_APPLETALK_SOCKET; | |
1da177e4 LT |
1112 | } |
1113 | ||
1114 | return SECCLASS_SOCKET; | |
1115 | } | |
1116 | ||
1117 | #ifdef CONFIG_PROC_FS | |
1118 | static int selinux_proc_get_sid(struct proc_dir_entry *de, | |
1119 | u16 tclass, | |
1120 | u32 *sid) | |
1121 | { | |
1122 | int buflen, rc; | |
1123 | char *buffer, *path, *end; | |
1124 | ||
828dfe1d | 1125 | buffer = (char *)__get_free_page(GFP_KERNEL); |
1da177e4 LT |
1126 | if (!buffer) |
1127 | return -ENOMEM; | |
1128 | ||
1129 | buflen = PAGE_SIZE; | |
1130 | end = buffer+buflen; | |
1131 | *--end = '\0'; | |
1132 | buflen--; | |
1133 | path = end-1; | |
1134 | *path = '/'; | |
1135 | while (de && de != de->parent) { | |
1136 | buflen -= de->namelen + 1; | |
1137 | if (buflen < 0) | |
1138 | break; | |
1139 | end -= de->namelen; | |
1140 | memcpy(end, de->name, de->namelen); | |
1141 | *--end = '/'; | |
1142 | path = end; | |
1143 | de = de->parent; | |
1144 | } | |
1145 | rc = security_genfs_sid("proc", path, tclass, sid); | |
1146 | free_page((unsigned long)buffer); | |
1147 | return rc; | |
1148 | } | |
1149 | #else | |
1150 | static int selinux_proc_get_sid(struct proc_dir_entry *de, | |
1151 | u16 tclass, | |
1152 | u32 *sid) | |
1153 | { | |
1154 | return -EINVAL; | |
1155 | } | |
1156 | #endif | |
1157 | ||
1158 | /* The inode's security attributes must be initialized before first use. */ | |
1159 | static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry) | |
1160 | { | |
1161 | struct superblock_security_struct *sbsec = NULL; | |
1162 | struct inode_security_struct *isec = inode->i_security; | |
1163 | u32 sid; | |
1164 | struct dentry *dentry; | |
1165 | #define INITCONTEXTLEN 255 | |
1166 | char *context = NULL; | |
1167 | unsigned len = 0; | |
1168 | int rc = 0; | |
1da177e4 LT |
1169 | |
1170 | if (isec->initialized) | |
1171 | goto out; | |
1172 | ||
23970741 | 1173 | mutex_lock(&isec->lock); |
1da177e4 | 1174 | if (isec->initialized) |
23970741 | 1175 | goto out_unlock; |
1da177e4 LT |
1176 | |
1177 | sbsec = inode->i_sb->s_security; | |
1178 | if (!sbsec->initialized) { | |
1179 | /* Defer initialization until selinux_complete_init, | |
1180 | after the initial policy is loaded and the security | |
1181 | server is ready to handle calls. */ | |
1182 | spin_lock(&sbsec->isec_lock); | |
1183 | if (list_empty(&isec->list)) | |
1184 | list_add(&isec->list, &sbsec->isec_head); | |
1185 | spin_unlock(&sbsec->isec_lock); | |
23970741 | 1186 | goto out_unlock; |
1da177e4 LT |
1187 | } |
1188 | ||
1189 | switch (sbsec->behavior) { | |
1190 | case SECURITY_FS_USE_XATTR: | |
1191 | if (!inode->i_op->getxattr) { | |
1192 | isec->sid = sbsec->def_sid; | |
1193 | break; | |
1194 | } | |
1195 | ||
1196 | /* Need a dentry, since the xattr API requires one. | |
1197 | Life would be simpler if we could just pass the inode. */ | |
1198 | if (opt_dentry) { | |
1199 | /* Called from d_instantiate or d_splice_alias. */ | |
1200 | dentry = dget(opt_dentry); | |
1201 | } else { | |
1202 | /* Called from selinux_complete_init, try to find a dentry. */ | |
1203 | dentry = d_find_alias(inode); | |
1204 | } | |
1205 | if (!dentry) { | |
744ba35e | 1206 | printk(KERN_WARNING "SELinux: %s: no dentry for dev=%s " |
dd6f953a | 1207 | "ino=%ld\n", __func__, inode->i_sb->s_id, |
1da177e4 | 1208 | inode->i_ino); |
23970741 | 1209 | goto out_unlock; |
1da177e4 LT |
1210 | } |
1211 | ||
1212 | len = INITCONTEXTLEN; | |
869ab514 | 1213 | context = kmalloc(len, GFP_NOFS); |
1da177e4 LT |
1214 | if (!context) { |
1215 | rc = -ENOMEM; | |
1216 | dput(dentry); | |
23970741 | 1217 | goto out_unlock; |
1da177e4 LT |
1218 | } |
1219 | rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, | |
1220 | context, len); | |
1221 | if (rc == -ERANGE) { | |
1222 | /* Need a larger buffer. Query for the right size. */ | |
1223 | rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, | |
1224 | NULL, 0); | |
1225 | if (rc < 0) { | |
1226 | dput(dentry); | |
23970741 | 1227 | goto out_unlock; |
1da177e4 LT |
1228 | } |
1229 | kfree(context); | |
1230 | len = rc; | |
869ab514 | 1231 | context = kmalloc(len, GFP_NOFS); |
1da177e4 LT |
1232 | if (!context) { |
1233 | rc = -ENOMEM; | |
1234 | dput(dentry); | |
23970741 | 1235 | goto out_unlock; |
1da177e4 LT |
1236 | } |
1237 | rc = inode->i_op->getxattr(dentry, | |
1238 | XATTR_NAME_SELINUX, | |
1239 | context, len); | |
1240 | } | |
1241 | dput(dentry); | |
1242 | if (rc < 0) { | |
1243 | if (rc != -ENODATA) { | |
744ba35e | 1244 | printk(KERN_WARNING "SELinux: %s: getxattr returned " |
dd6f953a | 1245 | "%d for dev=%s ino=%ld\n", __func__, |
1da177e4 LT |
1246 | -rc, inode->i_sb->s_id, inode->i_ino); |
1247 | kfree(context); | |
23970741 | 1248 | goto out_unlock; |
1da177e4 LT |
1249 | } |
1250 | /* Map ENODATA to the default file SID */ | |
1251 | sid = sbsec->def_sid; | |
1252 | rc = 0; | |
1253 | } else { | |
f5c1d5b2 | 1254 | rc = security_context_to_sid_default(context, rc, &sid, |
869ab514 SS |
1255 | sbsec->def_sid, |
1256 | GFP_NOFS); | |
1da177e4 | 1257 | if (rc) { |
744ba35e | 1258 | printk(KERN_WARNING "SELinux: %s: context_to_sid(%s) " |
1da177e4 | 1259 | "returned %d for dev=%s ino=%ld\n", |
dd6f953a | 1260 | __func__, context, -rc, |
1da177e4 LT |
1261 | inode->i_sb->s_id, inode->i_ino); |
1262 | kfree(context); | |
1263 | /* Leave with the unlabeled SID */ | |
1264 | rc = 0; | |
1265 | break; | |
1266 | } | |
1267 | } | |
1268 | kfree(context); | |
1269 | isec->sid = sid; | |
1270 | break; | |
1271 | case SECURITY_FS_USE_TASK: | |
1272 | isec->sid = isec->task_sid; | |
1273 | break; | |
1274 | case SECURITY_FS_USE_TRANS: | |
1275 | /* Default to the fs SID. */ | |
1276 | isec->sid = sbsec->sid; | |
1277 | ||
1278 | /* Try to obtain a transition SID. */ | |
1279 | isec->sclass = inode_mode_to_security_class(inode->i_mode); | |
1280 | rc = security_transition_sid(isec->task_sid, | |
1281 | sbsec->sid, | |
1282 | isec->sclass, | |
1283 | &sid); | |
1284 | if (rc) | |
23970741 | 1285 | goto out_unlock; |
1da177e4 LT |
1286 | isec->sid = sid; |
1287 | break; | |
c312feb2 EP |
1288 | case SECURITY_FS_USE_MNTPOINT: |
1289 | isec->sid = sbsec->mntpoint_sid; | |
1290 | break; | |
1da177e4 | 1291 | default: |
c312feb2 | 1292 | /* Default to the fs superblock SID. */ |
1da177e4 LT |
1293 | isec->sid = sbsec->sid; |
1294 | ||
ea6b184f | 1295 | if (sbsec->proc && !S_ISLNK(inode->i_mode)) { |
1da177e4 LT |
1296 | struct proc_inode *proci = PROC_I(inode); |
1297 | if (proci->pde) { | |
1298 | isec->sclass = inode_mode_to_security_class(inode->i_mode); | |
1299 | rc = selinux_proc_get_sid(proci->pde, | |
1300 | isec->sclass, | |
1301 | &sid); | |
1302 | if (rc) | |
23970741 | 1303 | goto out_unlock; |
1da177e4 LT |
1304 | isec->sid = sid; |
1305 | } | |
1306 | } | |
1307 | break; | |
1308 | } | |
1309 | ||
1310 | isec->initialized = 1; | |
1311 | ||
23970741 EP |
1312 | out_unlock: |
1313 | mutex_unlock(&isec->lock); | |
1da177e4 LT |
1314 | out: |
1315 | if (isec->sclass == SECCLASS_FILE) | |
1316 | isec->sclass = inode_mode_to_security_class(inode->i_mode); | |
1da177e4 LT |
1317 | return rc; |
1318 | } | |
1319 | ||
1320 | /* Convert a Linux signal to an access vector. */ | |
1321 | static inline u32 signal_to_av(int sig) | |
1322 | { | |
1323 | u32 perm = 0; | |
1324 | ||
1325 | switch (sig) { | |
1326 | case SIGCHLD: | |
1327 | /* Commonly granted from child to parent. */ | |
1328 | perm = PROCESS__SIGCHLD; | |
1329 | break; | |
1330 | case SIGKILL: | |
1331 | /* Cannot be caught or ignored */ | |
1332 | perm = PROCESS__SIGKILL; | |
1333 | break; | |
1334 | case SIGSTOP: | |
1335 | /* Cannot be caught or ignored */ | |
1336 | perm = PROCESS__SIGSTOP; | |
1337 | break; | |
1338 | default: | |
1339 | /* All other signals. */ | |
1340 | perm = PROCESS__SIGNAL; | |
1341 | break; | |
1342 | } | |
1343 | ||
1344 | return perm; | |
1345 | } | |
1346 | ||
1347 | /* Check permission betweeen a pair of tasks, e.g. signal checks, | |
1348 | fork check, ptrace check, etc. */ | |
1349 | static int task_has_perm(struct task_struct *tsk1, | |
1350 | struct task_struct *tsk2, | |
1351 | u32 perms) | |
1352 | { | |
1353 | struct task_security_struct *tsec1, *tsec2; | |
1354 | ||
1355 | tsec1 = tsk1->security; | |
1356 | tsec2 = tsk2->security; | |
1357 | return avc_has_perm(tsec1->sid, tsec2->sid, | |
1358 | SECCLASS_PROCESS, perms, NULL); | |
1359 | } | |
1360 | ||
b68e418c SS |
1361 | #if CAP_LAST_CAP > 63 |
1362 | #error Fix SELinux to handle capabilities > 63. | |
1363 | #endif | |
1364 | ||
1da177e4 LT |
1365 | /* Check whether a task is allowed to use a capability. */ |
1366 | static int task_has_capability(struct task_struct *tsk, | |
1367 | int cap) | |
1368 | { | |
1369 | struct task_security_struct *tsec; | |
1370 | struct avc_audit_data ad; | |
b68e418c SS |
1371 | u16 sclass; |
1372 | u32 av = CAP_TO_MASK(cap); | |
1da177e4 LT |
1373 | |
1374 | tsec = tsk->security; | |
1375 | ||
828dfe1d | 1376 | AVC_AUDIT_DATA_INIT(&ad, CAP); |
1da177e4 LT |
1377 | ad.tsk = tsk; |
1378 | ad.u.cap = cap; | |
1379 | ||
b68e418c SS |
1380 | switch (CAP_TO_INDEX(cap)) { |
1381 | case 0: | |
1382 | sclass = SECCLASS_CAPABILITY; | |
1383 | break; | |
1384 | case 1: | |
1385 | sclass = SECCLASS_CAPABILITY2; | |
1386 | break; | |
1387 | default: | |
1388 | printk(KERN_ERR | |
1389 | "SELinux: out of range capability %d\n", cap); | |
1390 | BUG(); | |
1391 | } | |
1392 | return avc_has_perm(tsec->sid, tsec->sid, sclass, av, &ad); | |
1da177e4 LT |
1393 | } |
1394 | ||
1395 | /* Check whether a task is allowed to use a system operation. */ | |
1396 | static int task_has_system(struct task_struct *tsk, | |
1397 | u32 perms) | |
1398 | { | |
1399 | struct task_security_struct *tsec; | |
1400 | ||
1401 | tsec = tsk->security; | |
1402 | ||
1403 | return avc_has_perm(tsec->sid, SECINITSID_KERNEL, | |
1404 | SECCLASS_SYSTEM, perms, NULL); | |
1405 | } | |
1406 | ||
1407 | /* Check whether a task has a particular permission to an inode. | |
1408 | The 'adp' parameter is optional and allows other audit | |
1409 | data to be passed (e.g. the dentry). */ | |
1410 | static int inode_has_perm(struct task_struct *tsk, | |
1411 | struct inode *inode, | |
1412 | u32 perms, | |
1413 | struct avc_audit_data *adp) | |
1414 | { | |
1415 | struct task_security_struct *tsec; | |
1416 | struct inode_security_struct *isec; | |
1417 | struct avc_audit_data ad; | |
1418 | ||
828dfe1d | 1419 | if (unlikely(IS_PRIVATE(inode))) |
bbaca6c2 SS |
1420 | return 0; |
1421 | ||
1da177e4 LT |
1422 | tsec = tsk->security; |
1423 | isec = inode->i_security; | |
1424 | ||
1425 | if (!adp) { | |
1426 | adp = &ad; | |
1427 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
1428 | ad.u.fs.inode = inode; | |
1429 | } | |
1430 | ||
1431 | return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, adp); | |
1432 | } | |
1433 | ||
1434 | /* Same as inode_has_perm, but pass explicit audit data containing | |
1435 | the dentry to help the auditing code to more easily generate the | |
1436 | pathname if needed. */ | |
1437 | static inline int dentry_has_perm(struct task_struct *tsk, | |
1438 | struct vfsmount *mnt, | |
1439 | struct dentry *dentry, | |
1440 | u32 av) | |
1441 | { | |
1442 | struct inode *inode = dentry->d_inode; | |
1443 | struct avc_audit_data ad; | |
828dfe1d | 1444 | AVC_AUDIT_DATA_INIT(&ad, FS); |
44707fdf JB |
1445 | ad.u.fs.path.mnt = mnt; |
1446 | ad.u.fs.path.dentry = dentry; | |
1da177e4 LT |
1447 | return inode_has_perm(tsk, inode, av, &ad); |
1448 | } | |
1449 | ||
1450 | /* Check whether a task can use an open file descriptor to | |
1451 | access an inode in a given way. Check access to the | |
1452 | descriptor itself, and then use dentry_has_perm to | |
1453 | check a particular permission to the file. | |
1454 | Access to the descriptor is implicitly granted if it | |
1455 | has the same SID as the process. If av is zero, then | |
1456 | access to the file is not checked, e.g. for cases | |
1457 | where only the descriptor is affected like seek. */ | |
858119e1 | 1458 | static int file_has_perm(struct task_struct *tsk, |
1da177e4 LT |
1459 | struct file *file, |
1460 | u32 av) | |
1461 | { | |
1462 | struct task_security_struct *tsec = tsk->security; | |
1463 | struct file_security_struct *fsec = file->f_security; | |
44707fdf | 1464 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1465 | struct avc_audit_data ad; |
1466 | int rc; | |
1467 | ||
1468 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
44707fdf | 1469 | ad.u.fs.path = file->f_path; |
1da177e4 LT |
1470 | |
1471 | if (tsec->sid != fsec->sid) { | |
1472 | rc = avc_has_perm(tsec->sid, fsec->sid, | |
1473 | SECCLASS_FD, | |
1474 | FD__USE, | |
1475 | &ad); | |
1476 | if (rc) | |
1477 | return rc; | |
1478 | } | |
1479 | ||
1480 | /* av is zero if only checking access to the descriptor. */ | |
1481 | if (av) | |
1482 | return inode_has_perm(tsk, inode, av, &ad); | |
1483 | ||
1484 | return 0; | |
1485 | } | |
1486 | ||
1487 | /* Check whether a task can create a file. */ | |
1488 | static int may_create(struct inode *dir, | |
1489 | struct dentry *dentry, | |
1490 | u16 tclass) | |
1491 | { | |
1492 | struct task_security_struct *tsec; | |
1493 | struct inode_security_struct *dsec; | |
1494 | struct superblock_security_struct *sbsec; | |
1495 | u32 newsid; | |
1496 | struct avc_audit_data ad; | |
1497 | int rc; | |
1498 | ||
1499 | tsec = current->security; | |
1500 | dsec = dir->i_security; | |
1501 | sbsec = dir->i_sb->s_security; | |
1502 | ||
1503 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
44707fdf | 1504 | ad.u.fs.path.dentry = dentry; |
1da177e4 LT |
1505 | |
1506 | rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR, | |
1507 | DIR__ADD_NAME | DIR__SEARCH, | |
1508 | &ad); | |
1509 | if (rc) | |
1510 | return rc; | |
1511 | ||
1512 | if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) { | |
1513 | newsid = tsec->create_sid; | |
1514 | } else { | |
1515 | rc = security_transition_sid(tsec->sid, dsec->sid, tclass, | |
1516 | &newsid); | |
1517 | if (rc) | |
1518 | return rc; | |
1519 | } | |
1520 | ||
1521 | rc = avc_has_perm(tsec->sid, newsid, tclass, FILE__CREATE, &ad); | |
1522 | if (rc) | |
1523 | return rc; | |
1524 | ||
1525 | return avc_has_perm(newsid, sbsec->sid, | |
1526 | SECCLASS_FILESYSTEM, | |
1527 | FILESYSTEM__ASSOCIATE, &ad); | |
1528 | } | |
1529 | ||
4eb582cf ML |
1530 | /* Check whether a task can create a key. */ |
1531 | static int may_create_key(u32 ksid, | |
1532 | struct task_struct *ctx) | |
1533 | { | |
1534 | struct task_security_struct *tsec; | |
1535 | ||
1536 | tsec = ctx->security; | |
1537 | ||
1538 | return avc_has_perm(tsec->sid, ksid, SECCLASS_KEY, KEY__CREATE, NULL); | |
1539 | } | |
1540 | ||
828dfe1d EP |
1541 | #define MAY_LINK 0 |
1542 | #define MAY_UNLINK 1 | |
1543 | #define MAY_RMDIR 2 | |
1da177e4 LT |
1544 | |
1545 | /* Check whether a task can link, unlink, or rmdir a file/directory. */ | |
1546 | static int may_link(struct inode *dir, | |
1547 | struct dentry *dentry, | |
1548 | int kind) | |
1549 | ||
1550 | { | |
1551 | struct task_security_struct *tsec; | |
1552 | struct inode_security_struct *dsec, *isec; | |
1553 | struct avc_audit_data ad; | |
1554 | u32 av; | |
1555 | int rc; | |
1556 | ||
1557 | tsec = current->security; | |
1558 | dsec = dir->i_security; | |
1559 | isec = dentry->d_inode->i_security; | |
1560 | ||
1561 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
44707fdf | 1562 | ad.u.fs.path.dentry = dentry; |
1da177e4 LT |
1563 | |
1564 | av = DIR__SEARCH; | |
1565 | av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME); | |
1566 | rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR, av, &ad); | |
1567 | if (rc) | |
1568 | return rc; | |
1569 | ||
1570 | switch (kind) { | |
1571 | case MAY_LINK: | |
1572 | av = FILE__LINK; | |
1573 | break; | |
1574 | case MAY_UNLINK: | |
1575 | av = FILE__UNLINK; | |
1576 | break; | |
1577 | case MAY_RMDIR: | |
1578 | av = DIR__RMDIR; | |
1579 | break; | |
1580 | default: | |
744ba35e EP |
1581 | printk(KERN_WARNING "SELinux: %s: unrecognized kind %d\n", |
1582 | __func__, kind); | |
1da177e4 LT |
1583 | return 0; |
1584 | } | |
1585 | ||
1586 | rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass, av, &ad); | |
1587 | return rc; | |
1588 | } | |
1589 | ||
1590 | static inline int may_rename(struct inode *old_dir, | |
1591 | struct dentry *old_dentry, | |
1592 | struct inode *new_dir, | |
1593 | struct dentry *new_dentry) | |
1594 | { | |
1595 | struct task_security_struct *tsec; | |
1596 | struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec; | |
1597 | struct avc_audit_data ad; | |
1598 | u32 av; | |
1599 | int old_is_dir, new_is_dir; | |
1600 | int rc; | |
1601 | ||
1602 | tsec = current->security; | |
1603 | old_dsec = old_dir->i_security; | |
1604 | old_isec = old_dentry->d_inode->i_security; | |
1605 | old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode); | |
1606 | new_dsec = new_dir->i_security; | |
1607 | ||
1608 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
1609 | ||
44707fdf | 1610 | ad.u.fs.path.dentry = old_dentry; |
1da177e4 LT |
1611 | rc = avc_has_perm(tsec->sid, old_dsec->sid, SECCLASS_DIR, |
1612 | DIR__REMOVE_NAME | DIR__SEARCH, &ad); | |
1613 | if (rc) | |
1614 | return rc; | |
1615 | rc = avc_has_perm(tsec->sid, old_isec->sid, | |
1616 | old_isec->sclass, FILE__RENAME, &ad); | |
1617 | if (rc) | |
1618 | return rc; | |
1619 | if (old_is_dir && new_dir != old_dir) { | |
1620 | rc = avc_has_perm(tsec->sid, old_isec->sid, | |
1621 | old_isec->sclass, DIR__REPARENT, &ad); | |
1622 | if (rc) | |
1623 | return rc; | |
1624 | } | |
1625 | ||
44707fdf | 1626 | ad.u.fs.path.dentry = new_dentry; |
1da177e4 LT |
1627 | av = DIR__ADD_NAME | DIR__SEARCH; |
1628 | if (new_dentry->d_inode) | |
1629 | av |= DIR__REMOVE_NAME; | |
1630 | rc = avc_has_perm(tsec->sid, new_dsec->sid, SECCLASS_DIR, av, &ad); | |
1631 | if (rc) | |
1632 | return rc; | |
1633 | if (new_dentry->d_inode) { | |
1634 | new_isec = new_dentry->d_inode->i_security; | |
1635 | new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode); | |
1636 | rc = avc_has_perm(tsec->sid, new_isec->sid, | |
1637 | new_isec->sclass, | |
1638 | (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad); | |
1639 | if (rc) | |
1640 | return rc; | |
1641 | } | |
1642 | ||
1643 | return 0; | |
1644 | } | |
1645 | ||
1646 | /* Check whether a task can perform a filesystem operation. */ | |
1647 | static int superblock_has_perm(struct task_struct *tsk, | |
1648 | struct super_block *sb, | |
1649 | u32 perms, | |
1650 | struct avc_audit_data *ad) | |
1651 | { | |
1652 | struct task_security_struct *tsec; | |
1653 | struct superblock_security_struct *sbsec; | |
1654 | ||
1655 | tsec = tsk->security; | |
1656 | sbsec = sb->s_security; | |
1657 | return avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, | |
1658 | perms, ad); | |
1659 | } | |
1660 | ||
1661 | /* Convert a Linux mode and permission mask to an access vector. */ | |
1662 | static inline u32 file_mask_to_av(int mode, int mask) | |
1663 | { | |
1664 | u32 av = 0; | |
1665 | ||
1666 | if ((mode & S_IFMT) != S_IFDIR) { | |
1667 | if (mask & MAY_EXEC) | |
1668 | av |= FILE__EXECUTE; | |
1669 | if (mask & MAY_READ) | |
1670 | av |= FILE__READ; | |
1671 | ||
1672 | if (mask & MAY_APPEND) | |
1673 | av |= FILE__APPEND; | |
1674 | else if (mask & MAY_WRITE) | |
1675 | av |= FILE__WRITE; | |
1676 | ||
1677 | } else { | |
1678 | if (mask & MAY_EXEC) | |
1679 | av |= DIR__SEARCH; | |
1680 | if (mask & MAY_WRITE) | |
1681 | av |= DIR__WRITE; | |
1682 | if (mask & MAY_READ) | |
1683 | av |= DIR__READ; | |
1684 | } | |
1685 | ||
1686 | return av; | |
1687 | } | |
1688 | ||
b0c636b9 EP |
1689 | /* |
1690 | * Convert a file mask to an access vector and include the correct open | |
1691 | * open permission. | |
1692 | */ | |
1693 | static inline u32 open_file_mask_to_av(int mode, int mask) | |
1694 | { | |
1695 | u32 av = file_mask_to_av(mode, mask); | |
1696 | ||
1697 | if (selinux_policycap_openperm) { | |
1698 | /* | |
1699 | * lnk files and socks do not really have an 'open' | |
1700 | */ | |
1701 | if (S_ISREG(mode)) | |
1702 | av |= FILE__OPEN; | |
1703 | else if (S_ISCHR(mode)) | |
1704 | av |= CHR_FILE__OPEN; | |
1705 | else if (S_ISBLK(mode)) | |
1706 | av |= BLK_FILE__OPEN; | |
1707 | else if (S_ISFIFO(mode)) | |
1708 | av |= FIFO_FILE__OPEN; | |
1709 | else if (S_ISDIR(mode)) | |
1710 | av |= DIR__OPEN; | |
1711 | else | |
744ba35e EP |
1712 | printk(KERN_ERR "SELinux: WARNING: inside %s with " |
1713 | "unknown mode:%x\n", __func__, mode); | |
b0c636b9 EP |
1714 | } |
1715 | return av; | |
1716 | } | |
1717 | ||
1da177e4 LT |
1718 | /* Convert a Linux file to an access vector. */ |
1719 | static inline u32 file_to_av(struct file *file) | |
1720 | { | |
1721 | u32 av = 0; | |
1722 | ||
1723 | if (file->f_mode & FMODE_READ) | |
1724 | av |= FILE__READ; | |
1725 | if (file->f_mode & FMODE_WRITE) { | |
1726 | if (file->f_flags & O_APPEND) | |
1727 | av |= FILE__APPEND; | |
1728 | else | |
1729 | av |= FILE__WRITE; | |
1730 | } | |
0794c66d SS |
1731 | if (!av) { |
1732 | /* | |
1733 | * Special file opened with flags 3 for ioctl-only use. | |
1734 | */ | |
1735 | av = FILE__IOCTL; | |
1736 | } | |
1da177e4 LT |
1737 | |
1738 | return av; | |
1739 | } | |
1740 | ||
1da177e4 LT |
1741 | /* Hook functions begin here. */ |
1742 | ||
5cd9c58f DH |
1743 | static int selinux_ptrace_may_access(struct task_struct *child, |
1744 | unsigned int mode) | |
1da177e4 | 1745 | { |
1da177e4 LT |
1746 | int rc; |
1747 | ||
5cd9c58f | 1748 | rc = secondary_ops->ptrace_may_access(child, mode); |
1da177e4 LT |
1749 | if (rc) |
1750 | return rc; | |
1751 | ||
006ebb40 | 1752 | if (mode == PTRACE_MODE_READ) { |
5cd9c58f | 1753 | struct task_security_struct *tsec = current->security; |
006ebb40 SS |
1754 | struct task_security_struct *csec = child->security; |
1755 | return avc_has_perm(tsec->sid, csec->sid, | |
1756 | SECCLASS_FILE, FILE__READ, NULL); | |
1757 | } | |
1758 | ||
5cd9c58f DH |
1759 | return task_has_perm(current, child, PROCESS__PTRACE); |
1760 | } | |
1761 | ||
1762 | static int selinux_ptrace_traceme(struct task_struct *parent) | |
1763 | { | |
1764 | int rc; | |
1765 | ||
1766 | rc = secondary_ops->ptrace_traceme(parent); | |
1767 | if (rc) | |
1768 | return rc; | |
1769 | ||
1770 | return task_has_perm(parent, current, PROCESS__PTRACE); | |
1da177e4 LT |
1771 | } |
1772 | ||
1773 | static int selinux_capget(struct task_struct *target, kernel_cap_t *effective, | |
828dfe1d | 1774 | kernel_cap_t *inheritable, kernel_cap_t *permitted) |
1da177e4 LT |
1775 | { |
1776 | int error; | |
1777 | ||
1778 | error = task_has_perm(current, target, PROCESS__GETCAP); | |
1779 | if (error) | |
1780 | return error; | |
1781 | ||
1782 | return secondary_ops->capget(target, effective, inheritable, permitted); | |
1783 | } | |
1784 | ||
1785 | static int selinux_capset_check(struct task_struct *target, kernel_cap_t *effective, | |
828dfe1d | 1786 | kernel_cap_t *inheritable, kernel_cap_t *permitted) |
1da177e4 LT |
1787 | { |
1788 | int error; | |
1789 | ||
1790 | error = secondary_ops->capset_check(target, effective, inheritable, permitted); | |
1791 | if (error) | |
1792 | return error; | |
1793 | ||
1794 | return task_has_perm(current, target, PROCESS__SETCAP); | |
1795 | } | |
1796 | ||
1797 | static void selinux_capset_set(struct task_struct *target, kernel_cap_t *effective, | |
828dfe1d | 1798 | kernel_cap_t *inheritable, kernel_cap_t *permitted) |
1da177e4 LT |
1799 | { |
1800 | secondary_ops->capset_set(target, effective, inheritable, permitted); | |
1801 | } | |
1802 | ||
1803 | static int selinux_capable(struct task_struct *tsk, int cap) | |
1804 | { | |
1805 | int rc; | |
1806 | ||
1807 | rc = secondary_ops->capable(tsk, cap); | |
1808 | if (rc) | |
1809 | return rc; | |
1810 | ||
828dfe1d | 1811 | return task_has_capability(tsk, cap); |
1da177e4 LT |
1812 | } |
1813 | ||
3fbfa981 EB |
1814 | static int selinux_sysctl_get_sid(ctl_table *table, u16 tclass, u32 *sid) |
1815 | { | |
1816 | int buflen, rc; | |
1817 | char *buffer, *path, *end; | |
1818 | ||
1819 | rc = -ENOMEM; | |
828dfe1d | 1820 | buffer = (char *)__get_free_page(GFP_KERNEL); |
3fbfa981 EB |
1821 | if (!buffer) |
1822 | goto out; | |
1823 | ||
1824 | buflen = PAGE_SIZE; | |
1825 | end = buffer+buflen; | |
1826 | *--end = '\0'; | |
1827 | buflen--; | |
1828 | path = end-1; | |
1829 | *path = '/'; | |
1830 | while (table) { | |
1831 | const char *name = table->procname; | |
1832 | size_t namelen = strlen(name); | |
1833 | buflen -= namelen + 1; | |
1834 | if (buflen < 0) | |
1835 | goto out_free; | |
1836 | end -= namelen; | |
1837 | memcpy(end, name, namelen); | |
1838 | *--end = '/'; | |
1839 | path = end; | |
1840 | table = table->parent; | |
1841 | } | |
b599fdfd EB |
1842 | buflen -= 4; |
1843 | if (buflen < 0) | |
1844 | goto out_free; | |
1845 | end -= 4; | |
1846 | memcpy(end, "/sys", 4); | |
1847 | path = end; | |
3fbfa981 EB |
1848 | rc = security_genfs_sid("proc", path, tclass, sid); |
1849 | out_free: | |
1850 | free_page((unsigned long)buffer); | |
1851 | out: | |
1852 | return rc; | |
1853 | } | |
1854 | ||
1da177e4 LT |
1855 | static int selinux_sysctl(ctl_table *table, int op) |
1856 | { | |
1857 | int error = 0; | |
1858 | u32 av; | |
1859 | struct task_security_struct *tsec; | |
1860 | u32 tsid; | |
1861 | int rc; | |
1862 | ||
1863 | rc = secondary_ops->sysctl(table, op); | |
1864 | if (rc) | |
1865 | return rc; | |
1866 | ||
1867 | tsec = current->security; | |
1868 | ||
3fbfa981 EB |
1869 | rc = selinux_sysctl_get_sid(table, (op == 0001) ? |
1870 | SECCLASS_DIR : SECCLASS_FILE, &tsid); | |
1da177e4 LT |
1871 | if (rc) { |
1872 | /* Default to the well-defined sysctl SID. */ | |
1873 | tsid = SECINITSID_SYSCTL; | |
1874 | } | |
1875 | ||
1876 | /* The op values are "defined" in sysctl.c, thereby creating | |
1877 | * a bad coupling between this module and sysctl.c */ | |
828dfe1d | 1878 | if (op == 001) { |
1da177e4 LT |
1879 | error = avc_has_perm(tsec->sid, tsid, |
1880 | SECCLASS_DIR, DIR__SEARCH, NULL); | |
1881 | } else { | |
1882 | av = 0; | |
1883 | if (op & 004) | |
1884 | av |= FILE__READ; | |
1885 | if (op & 002) | |
1886 | av |= FILE__WRITE; | |
1887 | if (av) | |
1888 | error = avc_has_perm(tsec->sid, tsid, | |
1889 | SECCLASS_FILE, av, NULL); | |
828dfe1d | 1890 | } |
1da177e4 LT |
1891 | |
1892 | return error; | |
1893 | } | |
1894 | ||
1895 | static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb) | |
1896 | { | |
1897 | int rc = 0; | |
1898 | ||
1899 | if (!sb) | |
1900 | return 0; | |
1901 | ||
1902 | switch (cmds) { | |
828dfe1d EP |
1903 | case Q_SYNC: |
1904 | case Q_QUOTAON: | |
1905 | case Q_QUOTAOFF: | |
1906 | case Q_SETINFO: | |
1907 | case Q_SETQUOTA: | |
1908 | rc = superblock_has_perm(current, sb, FILESYSTEM__QUOTAMOD, | |
1909 | NULL); | |
1910 | break; | |
1911 | case Q_GETFMT: | |
1912 | case Q_GETINFO: | |
1913 | case Q_GETQUOTA: | |
1914 | rc = superblock_has_perm(current, sb, FILESYSTEM__QUOTAGET, | |
1915 | NULL); | |
1916 | break; | |
1917 | default: | |
1918 | rc = 0; /* let the kernel handle invalid cmds */ | |
1919 | break; | |
1da177e4 LT |
1920 | } |
1921 | return rc; | |
1922 | } | |
1923 | ||
1924 | static int selinux_quota_on(struct dentry *dentry) | |
1925 | { | |
1926 | return dentry_has_perm(current, NULL, dentry, FILE__QUOTAON); | |
1927 | } | |
1928 | ||
1929 | static int selinux_syslog(int type) | |
1930 | { | |
1931 | int rc; | |
1932 | ||
1933 | rc = secondary_ops->syslog(type); | |
1934 | if (rc) | |
1935 | return rc; | |
1936 | ||
1937 | switch (type) { | |
828dfe1d EP |
1938 | case 3: /* Read last kernel messages */ |
1939 | case 10: /* Return size of the log buffer */ | |
1940 | rc = task_has_system(current, SYSTEM__SYSLOG_READ); | |
1941 | break; | |
1942 | case 6: /* Disable logging to console */ | |
1943 | case 7: /* Enable logging to console */ | |
1944 | case 8: /* Set level of messages printed to console */ | |
1945 | rc = task_has_system(current, SYSTEM__SYSLOG_CONSOLE); | |
1946 | break; | |
1947 | case 0: /* Close log */ | |
1948 | case 1: /* Open log */ | |
1949 | case 2: /* Read from log */ | |
1950 | case 4: /* Read/clear last kernel messages */ | |
1951 | case 5: /* Clear ring buffer */ | |
1952 | default: | |
1953 | rc = task_has_system(current, SYSTEM__SYSLOG_MOD); | |
1954 | break; | |
1da177e4 LT |
1955 | } |
1956 | return rc; | |
1957 | } | |
1958 | ||
1959 | /* | |
1960 | * Check that a process has enough memory to allocate a new virtual | |
1961 | * mapping. 0 means there is enough memory for the allocation to | |
1962 | * succeed and -ENOMEM implies there is not. | |
1963 | * | |
1964 | * Note that secondary_ops->capable and task_has_perm_noaudit return 0 | |
1965 | * if the capability is granted, but __vm_enough_memory requires 1 if | |
1966 | * the capability is granted. | |
1967 | * | |
1968 | * Do not audit the selinux permission check, as this is applied to all | |
1969 | * processes that allocate mappings. | |
1970 | */ | |
34b4e4aa | 1971 | static int selinux_vm_enough_memory(struct mm_struct *mm, long pages) |
1da177e4 LT |
1972 | { |
1973 | int rc, cap_sys_admin = 0; | |
1974 | struct task_security_struct *tsec = current->security; | |
1975 | ||
1976 | rc = secondary_ops->capable(current, CAP_SYS_ADMIN); | |
1977 | if (rc == 0) | |
1978 | rc = avc_has_perm_noaudit(tsec->sid, tsec->sid, | |
2c3c05db SS |
1979 | SECCLASS_CAPABILITY, |
1980 | CAP_TO_MASK(CAP_SYS_ADMIN), | |
1981 | 0, | |
1982 | NULL); | |
1da177e4 LT |
1983 | |
1984 | if (rc == 0) | |
1985 | cap_sys_admin = 1; | |
1986 | ||
34b4e4aa | 1987 | return __vm_enough_memory(mm, pages, cap_sys_admin); |
1da177e4 LT |
1988 | } |
1989 | ||
1990 | /* binprm security operations */ | |
1991 | ||
1992 | static int selinux_bprm_alloc_security(struct linux_binprm *bprm) | |
1993 | { | |
1994 | struct bprm_security_struct *bsec; | |
1995 | ||
89d155ef | 1996 | bsec = kzalloc(sizeof(struct bprm_security_struct), GFP_KERNEL); |
1da177e4 LT |
1997 | if (!bsec) |
1998 | return -ENOMEM; | |
1999 | ||
1da177e4 LT |
2000 | bsec->sid = SECINITSID_UNLABELED; |
2001 | bsec->set = 0; | |
2002 | ||
2003 | bprm->security = bsec; | |
2004 | return 0; | |
2005 | } | |
2006 | ||
2007 | static int selinux_bprm_set_security(struct linux_binprm *bprm) | |
2008 | { | |
2009 | struct task_security_struct *tsec; | |
3d5ff529 | 2010 | struct inode *inode = bprm->file->f_path.dentry->d_inode; |
1da177e4 LT |
2011 | struct inode_security_struct *isec; |
2012 | struct bprm_security_struct *bsec; | |
2013 | u32 newsid; | |
2014 | struct avc_audit_data ad; | |
2015 | int rc; | |
2016 | ||
2017 | rc = secondary_ops->bprm_set_security(bprm); | |
2018 | if (rc) | |
2019 | return rc; | |
2020 | ||
2021 | bsec = bprm->security; | |
2022 | ||
2023 | if (bsec->set) | |
2024 | return 0; | |
2025 | ||
2026 | tsec = current->security; | |
2027 | isec = inode->i_security; | |
2028 | ||
2029 | /* Default to the current task SID. */ | |
2030 | bsec->sid = tsec->sid; | |
2031 | ||
28eba5bf | 2032 | /* Reset fs, key, and sock SIDs on execve. */ |
1da177e4 | 2033 | tsec->create_sid = 0; |
28eba5bf | 2034 | tsec->keycreate_sid = 0; |
42c3e03e | 2035 | tsec->sockcreate_sid = 0; |
1da177e4 LT |
2036 | |
2037 | if (tsec->exec_sid) { | |
2038 | newsid = tsec->exec_sid; | |
2039 | /* Reset exec SID on execve. */ | |
2040 | tsec->exec_sid = 0; | |
2041 | } else { | |
2042 | /* Check for a default transition on this program. */ | |
2043 | rc = security_transition_sid(tsec->sid, isec->sid, | |
828dfe1d | 2044 | SECCLASS_PROCESS, &newsid); |
1da177e4 LT |
2045 | if (rc) |
2046 | return rc; | |
2047 | } | |
2048 | ||
2049 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
44707fdf | 2050 | ad.u.fs.path = bprm->file->f_path; |
1da177e4 | 2051 | |
3d5ff529 | 2052 | if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID) |
1da177e4 LT |
2053 | newsid = tsec->sid; |
2054 | ||
828dfe1d | 2055 | if (tsec->sid == newsid) { |
1da177e4 LT |
2056 | rc = avc_has_perm(tsec->sid, isec->sid, |
2057 | SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad); | |
2058 | if (rc) | |
2059 | return rc; | |
2060 | } else { | |
2061 | /* Check permissions for the transition. */ | |
2062 | rc = avc_has_perm(tsec->sid, newsid, | |
2063 | SECCLASS_PROCESS, PROCESS__TRANSITION, &ad); | |
2064 | if (rc) | |
2065 | return rc; | |
2066 | ||
2067 | rc = avc_has_perm(newsid, isec->sid, | |
2068 | SECCLASS_FILE, FILE__ENTRYPOINT, &ad); | |
2069 | if (rc) | |
2070 | return rc; | |
2071 | ||
2072 | /* Clear any possibly unsafe personality bits on exec: */ | |
2073 | current->personality &= ~PER_CLEAR_ON_SETID; | |
2074 | ||
2075 | /* Set the security field to the new SID. */ | |
2076 | bsec->sid = newsid; | |
2077 | } | |
2078 | ||
2079 | bsec->set = 1; | |
2080 | return 0; | |
2081 | } | |
2082 | ||
828dfe1d | 2083 | static int selinux_bprm_check_security(struct linux_binprm *bprm) |
1da177e4 LT |
2084 | { |
2085 | return secondary_ops->bprm_check_security(bprm); | |
2086 | } | |
2087 | ||
2088 | ||
828dfe1d | 2089 | static int selinux_bprm_secureexec(struct linux_binprm *bprm) |
1da177e4 LT |
2090 | { |
2091 | struct task_security_struct *tsec = current->security; | |
2092 | int atsecure = 0; | |
2093 | ||
2094 | if (tsec->osid != tsec->sid) { | |
2095 | /* Enable secure mode for SIDs transitions unless | |
2096 | the noatsecure permission is granted between | |
2097 | the two SIDs, i.e. ahp returns 0. */ | |
2098 | atsecure = avc_has_perm(tsec->osid, tsec->sid, | |
2099 | SECCLASS_PROCESS, | |
2100 | PROCESS__NOATSECURE, NULL); | |
2101 | } | |
2102 | ||
2103 | return (atsecure || secondary_ops->bprm_secureexec(bprm)); | |
2104 | } | |
2105 | ||
2106 | static void selinux_bprm_free_security(struct linux_binprm *bprm) | |
2107 | { | |
9a5f04bf | 2108 | kfree(bprm->security); |
1da177e4 | 2109 | bprm->security = NULL; |
1da177e4 LT |
2110 | } |
2111 | ||
2112 | extern struct vfsmount *selinuxfs_mount; | |
2113 | extern struct dentry *selinux_null; | |
2114 | ||
2115 | /* Derived from fs/exec.c:flush_old_files. */ | |
828dfe1d | 2116 | static inline void flush_unauthorized_files(struct files_struct *files) |
1da177e4 LT |
2117 | { |
2118 | struct avc_audit_data ad; | |
2119 | struct file *file, *devnull = NULL; | |
b20c8122 | 2120 | struct tty_struct *tty; |
badf1662 | 2121 | struct fdtable *fdt; |
1da177e4 | 2122 | long j = -1; |
24ec839c | 2123 | int drop_tty = 0; |
1da177e4 | 2124 | |
24ec839c | 2125 | tty = get_current_tty(); |
1da177e4 LT |
2126 | if (tty) { |
2127 | file_list_lock(); | |
2f512016 | 2128 | file = list_entry(tty->tty_files.next, typeof(*file), f_u.fu_list); |
1da177e4 LT |
2129 | if (file) { |
2130 | /* Revalidate access to controlling tty. | |
2131 | Use inode_has_perm on the tty inode directly rather | |
2132 | than using file_has_perm, as this particular open | |
2133 | file may belong to another process and we are only | |
2134 | interested in the inode-based check here. */ | |
3d5ff529 | 2135 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
2136 | if (inode_has_perm(current, inode, |
2137 | FILE__READ | FILE__WRITE, NULL)) { | |
24ec839c | 2138 | drop_tty = 1; |
1da177e4 LT |
2139 | } |
2140 | } | |
2141 | file_list_unlock(); | |
452a00d2 | 2142 | tty_kref_put(tty); |
1da177e4 | 2143 | } |
98a27ba4 EB |
2144 | /* Reset controlling tty. */ |
2145 | if (drop_tty) | |
2146 | no_tty(); | |
1da177e4 LT |
2147 | |
2148 | /* Revalidate access to inherited open files. */ | |
2149 | ||
828dfe1d | 2150 | AVC_AUDIT_DATA_INIT(&ad, FS); |
1da177e4 LT |
2151 | |
2152 | spin_lock(&files->file_lock); | |
2153 | for (;;) { | |
2154 | unsigned long set, i; | |
2155 | int fd; | |
2156 | ||
2157 | j++; | |
2158 | i = j * __NFDBITS; | |
badf1662 | 2159 | fdt = files_fdtable(files); |
bbea9f69 | 2160 | if (i >= fdt->max_fds) |
1da177e4 | 2161 | break; |
badf1662 | 2162 | set = fdt->open_fds->fds_bits[j]; |
1da177e4 LT |
2163 | if (!set) |
2164 | continue; | |
2165 | spin_unlock(&files->file_lock); | |
828dfe1d | 2166 | for ( ; set ; i++, set >>= 1) { |
1da177e4 LT |
2167 | if (set & 1) { |
2168 | file = fget(i); | |
2169 | if (!file) | |
2170 | continue; | |
2171 | if (file_has_perm(current, | |
2172 | file, | |
2173 | file_to_av(file))) { | |
2174 | sys_close(i); | |
2175 | fd = get_unused_fd(); | |
2176 | if (fd != i) { | |
2177 | if (fd >= 0) | |
2178 | put_unused_fd(fd); | |
2179 | fput(file); | |
2180 | continue; | |
2181 | } | |
2182 | if (devnull) { | |
095975da | 2183 | get_file(devnull); |
1da177e4 LT |
2184 | } else { |
2185 | devnull = dentry_open(dget(selinux_null), mntget(selinuxfs_mount), O_RDWR); | |
fc5d81e6 AM |
2186 | if (IS_ERR(devnull)) { |
2187 | devnull = NULL; | |
1da177e4 LT |
2188 | put_unused_fd(fd); |
2189 | fput(file); | |
2190 | continue; | |
2191 | } | |
2192 | } | |
2193 | fd_install(fd, devnull); | |
2194 | } | |
2195 | fput(file); | |
2196 | } | |
2197 | } | |
2198 | spin_lock(&files->file_lock); | |
2199 | ||
2200 | } | |
2201 | spin_unlock(&files->file_lock); | |
2202 | } | |
2203 | ||
2204 | static void selinux_bprm_apply_creds(struct linux_binprm *bprm, int unsafe) | |
2205 | { | |
2206 | struct task_security_struct *tsec; | |
2207 | struct bprm_security_struct *bsec; | |
2208 | u32 sid; | |
2209 | int rc; | |
2210 | ||
2211 | secondary_ops->bprm_apply_creds(bprm, unsafe); | |
2212 | ||
2213 | tsec = current->security; | |
2214 | ||
2215 | bsec = bprm->security; | |
2216 | sid = bsec->sid; | |
2217 | ||
2218 | tsec->osid = tsec->sid; | |
2219 | bsec->unsafe = 0; | |
2220 | if (tsec->sid != sid) { | |
2221 | /* Check for shared state. If not ok, leave SID | |
2222 | unchanged and kill. */ | |
2223 | if (unsafe & LSM_UNSAFE_SHARE) { | |
2224 | rc = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS, | |
2225 | PROCESS__SHARE, NULL); | |
2226 | if (rc) { | |
2227 | bsec->unsafe = 1; | |
2228 | return; | |
2229 | } | |
2230 | } | |
2231 | ||
2232 | /* Check for ptracing, and update the task SID if ok. | |
2233 | Otherwise, leave SID unchanged and kill. */ | |
2234 | if (unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) { | |
0356357c RM |
2235 | struct task_struct *tracer; |
2236 | struct task_security_struct *sec; | |
2237 | u32 ptsid = 0; | |
2238 | ||
2239 | rcu_read_lock(); | |
0d094efe | 2240 | tracer = tracehook_tracer_task(current); |
0356357c RM |
2241 | if (likely(tracer != NULL)) { |
2242 | sec = tracer->security; | |
2243 | ptsid = sec->sid; | |
2244 | } | |
2245 | rcu_read_unlock(); | |
2246 | ||
2247 | if (ptsid != 0) { | |
2248 | rc = avc_has_perm(ptsid, sid, SECCLASS_PROCESS, | |
2249 | PROCESS__PTRACE, NULL); | |
2250 | if (rc) { | |
2251 | bsec->unsafe = 1; | |
2252 | return; | |
2253 | } | |
1da177e4 LT |
2254 | } |
2255 | } | |
2256 | tsec->sid = sid; | |
2257 | } | |
2258 | } | |
2259 | ||
2260 | /* | |
2261 | * called after apply_creds without the task lock held | |
2262 | */ | |
2263 | static void selinux_bprm_post_apply_creds(struct linux_binprm *bprm) | |
2264 | { | |
2265 | struct task_security_struct *tsec; | |
2266 | struct rlimit *rlim, *initrlim; | |
2267 | struct itimerval itimer; | |
2268 | struct bprm_security_struct *bsec; | |
2269 | int rc, i; | |
2270 | ||
2271 | tsec = current->security; | |
2272 | bsec = bprm->security; | |
2273 | ||
2274 | if (bsec->unsafe) { | |
2275 | force_sig_specific(SIGKILL, current); | |
2276 | return; | |
2277 | } | |
2278 | if (tsec->osid == tsec->sid) | |
2279 | return; | |
2280 | ||
2281 | /* Close files for which the new task SID is not authorized. */ | |
2282 | flush_unauthorized_files(current->files); | |
2283 | ||
2284 | /* Check whether the new SID can inherit signal state | |
2285 | from the old SID. If not, clear itimers to avoid | |
2286 | subsequent signal generation and flush and unblock | |
2287 | signals. This must occur _after_ the task SID has | |
2288 | been updated so that any kill done after the flush | |
2289 | will be checked against the new SID. */ | |
2290 | rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS, | |
2291 | PROCESS__SIGINH, NULL); | |
2292 | if (rc) { | |
2293 | memset(&itimer, 0, sizeof itimer); | |
2294 | for (i = 0; i < 3; i++) | |
2295 | do_setitimer(i, &itimer, NULL); | |
2296 | flush_signals(current); | |
2297 | spin_lock_irq(¤t->sighand->siglock); | |
2298 | flush_signal_handlers(current, 1); | |
2299 | sigemptyset(¤t->blocked); | |
2300 | recalc_sigpending(); | |
2301 | spin_unlock_irq(¤t->sighand->siglock); | |
2302 | } | |
2303 | ||
4ac212ad SS |
2304 | /* Always clear parent death signal on SID transitions. */ |
2305 | current->pdeath_signal = 0; | |
2306 | ||
1da177e4 LT |
2307 | /* Check whether the new SID can inherit resource limits |
2308 | from the old SID. If not, reset all soft limits to | |
2309 | the lower of the current task's hard limit and the init | |
2310 | task's soft limit. Note that the setting of hard limits | |
2311 | (even to lower them) can be controlled by the setrlimit | |
2312 | check. The inclusion of the init task's soft limit into | |
2313 | the computation is to avoid resetting soft limits higher | |
2314 | than the default soft limit for cases where the default | |
2315 | is lower than the hard limit, e.g. RLIMIT_CORE or | |
2316 | RLIMIT_STACK.*/ | |
2317 | rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS, | |
2318 | PROCESS__RLIMITINH, NULL); | |
2319 | if (rc) { | |
2320 | for (i = 0; i < RLIM_NLIMITS; i++) { | |
2321 | rlim = current->signal->rlim + i; | |
2322 | initrlim = init_task.signal->rlim+i; | |
828dfe1d | 2323 | rlim->rlim_cur = min(rlim->rlim_max, initrlim->rlim_cur); |
1da177e4 LT |
2324 | } |
2325 | if (current->signal->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY) { | |
2326 | /* | |
2327 | * This will cause RLIMIT_CPU calculations | |
2328 | * to be refigured. | |
2329 | */ | |
2330 | current->it_prof_expires = jiffies_to_cputime(1); | |
2331 | } | |
2332 | } | |
2333 | ||
2334 | /* Wake up the parent if it is waiting so that it can | |
2335 | recheck wait permission to the new task SID. */ | |
2336 | wake_up_interruptible(¤t->parent->signal->wait_chldexit); | |
2337 | } | |
2338 | ||
2339 | /* superblock security operations */ | |
2340 | ||
2341 | static int selinux_sb_alloc_security(struct super_block *sb) | |
2342 | { | |
2343 | return superblock_alloc_security(sb); | |
2344 | } | |
2345 | ||
2346 | static void selinux_sb_free_security(struct super_block *sb) | |
2347 | { | |
2348 | superblock_free_security(sb); | |
2349 | } | |
2350 | ||
2351 | static inline int match_prefix(char *prefix, int plen, char *option, int olen) | |
2352 | { | |
2353 | if (plen > olen) | |
2354 | return 0; | |
2355 | ||
2356 | return !memcmp(prefix, option, plen); | |
2357 | } | |
2358 | ||
2359 | static inline int selinux_option(char *option, int len) | |
2360 | { | |
832cbd9a EP |
2361 | return (match_prefix(CONTEXT_STR, sizeof(CONTEXT_STR)-1, option, len) || |
2362 | match_prefix(FSCONTEXT_STR, sizeof(FSCONTEXT_STR)-1, option, len) || | |
2363 | match_prefix(DEFCONTEXT_STR, sizeof(DEFCONTEXT_STR)-1, option, len) || | |
2364 | match_prefix(ROOTCONTEXT_STR, sizeof(ROOTCONTEXT_STR)-1, option, len)); | |
1da177e4 LT |
2365 | } |
2366 | ||
2367 | static inline void take_option(char **to, char *from, int *first, int len) | |
2368 | { | |
2369 | if (!*first) { | |
2370 | **to = ','; | |
2371 | *to += 1; | |
3528a953 | 2372 | } else |
1da177e4 LT |
2373 | *first = 0; |
2374 | memcpy(*to, from, len); | |
2375 | *to += len; | |
2376 | } | |
2377 | ||
828dfe1d EP |
2378 | static inline void take_selinux_option(char **to, char *from, int *first, |
2379 | int len) | |
3528a953 CO |
2380 | { |
2381 | int current_size = 0; | |
2382 | ||
2383 | if (!*first) { | |
2384 | **to = '|'; | |
2385 | *to += 1; | |
828dfe1d | 2386 | } else |
3528a953 CO |
2387 | *first = 0; |
2388 | ||
2389 | while (current_size < len) { | |
2390 | if (*from != '"') { | |
2391 | **to = *from; | |
2392 | *to += 1; | |
2393 | } | |
2394 | from += 1; | |
2395 | current_size += 1; | |
2396 | } | |
2397 | } | |
2398 | ||
e0007529 | 2399 | static int selinux_sb_copy_data(char *orig, char *copy) |
1da177e4 LT |
2400 | { |
2401 | int fnosec, fsec, rc = 0; | |
2402 | char *in_save, *in_curr, *in_end; | |
2403 | char *sec_curr, *nosec_save, *nosec; | |
3528a953 | 2404 | int open_quote = 0; |
1da177e4 LT |
2405 | |
2406 | in_curr = orig; | |
2407 | sec_curr = copy; | |
2408 | ||
1da177e4 LT |
2409 | nosec = (char *)get_zeroed_page(GFP_KERNEL); |
2410 | if (!nosec) { | |
2411 | rc = -ENOMEM; | |
2412 | goto out; | |
2413 | } | |
2414 | ||
2415 | nosec_save = nosec; | |
2416 | fnosec = fsec = 1; | |
2417 | in_save = in_end = orig; | |
2418 | ||
2419 | do { | |
3528a953 CO |
2420 | if (*in_end == '"') |
2421 | open_quote = !open_quote; | |
2422 | if ((*in_end == ',' && open_quote == 0) || | |
2423 | *in_end == '\0') { | |
1da177e4 LT |
2424 | int len = in_end - in_curr; |
2425 | ||
2426 | if (selinux_option(in_curr, len)) | |
3528a953 | 2427 | take_selinux_option(&sec_curr, in_curr, &fsec, len); |
1da177e4 LT |
2428 | else |
2429 | take_option(&nosec, in_curr, &fnosec, len); | |
2430 | ||
2431 | in_curr = in_end + 1; | |
2432 | } | |
2433 | } while (*in_end++); | |
2434 | ||
6931dfc9 | 2435 | strcpy(in_save, nosec_save); |
da3caa20 | 2436 | free_page((unsigned long)nosec_save); |
1da177e4 LT |
2437 | out: |
2438 | return rc; | |
2439 | } | |
2440 | ||
2441 | static int selinux_sb_kern_mount(struct super_block *sb, void *data) | |
2442 | { | |
2443 | struct avc_audit_data ad; | |
2444 | int rc; | |
2445 | ||
2446 | rc = superblock_doinit(sb, data); | |
2447 | if (rc) | |
2448 | return rc; | |
2449 | ||
828dfe1d | 2450 | AVC_AUDIT_DATA_INIT(&ad, FS); |
44707fdf | 2451 | ad.u.fs.path.dentry = sb->s_root; |
1da177e4 LT |
2452 | return superblock_has_perm(current, sb, FILESYSTEM__MOUNT, &ad); |
2453 | } | |
2454 | ||
726c3342 | 2455 | static int selinux_sb_statfs(struct dentry *dentry) |
1da177e4 LT |
2456 | { |
2457 | struct avc_audit_data ad; | |
2458 | ||
828dfe1d | 2459 | AVC_AUDIT_DATA_INIT(&ad, FS); |
44707fdf | 2460 | ad.u.fs.path.dentry = dentry->d_sb->s_root; |
726c3342 | 2461 | return superblock_has_perm(current, dentry->d_sb, FILESYSTEM__GETATTR, &ad); |
1da177e4 LT |
2462 | } |
2463 | ||
828dfe1d | 2464 | static int selinux_mount(char *dev_name, |
b5266eb4 | 2465 | struct path *path, |
828dfe1d EP |
2466 | char *type, |
2467 | unsigned long flags, | |
2468 | void *data) | |
1da177e4 LT |
2469 | { |
2470 | int rc; | |
2471 | ||
b5266eb4 | 2472 | rc = secondary_ops->sb_mount(dev_name, path, type, flags, data); |
1da177e4 LT |
2473 | if (rc) |
2474 | return rc; | |
2475 | ||
2476 | if (flags & MS_REMOUNT) | |
b5266eb4 | 2477 | return superblock_has_perm(current, path->mnt->mnt_sb, |
828dfe1d | 2478 | FILESYSTEM__REMOUNT, NULL); |
1da177e4 | 2479 | else |
b5266eb4 | 2480 | return dentry_has_perm(current, path->mnt, path->dentry, |
828dfe1d | 2481 | FILE__MOUNTON); |
1da177e4 LT |
2482 | } |
2483 | ||
2484 | static int selinux_umount(struct vfsmount *mnt, int flags) | |
2485 | { | |
2486 | int rc; | |
2487 | ||
2488 | rc = secondary_ops->sb_umount(mnt, flags); | |
2489 | if (rc) | |
2490 | return rc; | |
2491 | ||
828dfe1d EP |
2492 | return superblock_has_perm(current, mnt->mnt_sb, |
2493 | FILESYSTEM__UNMOUNT, NULL); | |
1da177e4 LT |
2494 | } |
2495 | ||
2496 | /* inode security operations */ | |
2497 | ||
2498 | static int selinux_inode_alloc_security(struct inode *inode) | |
2499 | { | |
2500 | return inode_alloc_security(inode); | |
2501 | } | |
2502 | ||
2503 | static void selinux_inode_free_security(struct inode *inode) | |
2504 | { | |
2505 | inode_free_security(inode); | |
2506 | } | |
2507 | ||
5e41ff9e SS |
2508 | static int selinux_inode_init_security(struct inode *inode, struct inode *dir, |
2509 | char **name, void **value, | |
2510 | size_t *len) | |
2511 | { | |
2512 | struct task_security_struct *tsec; | |
2513 | struct inode_security_struct *dsec; | |
2514 | struct superblock_security_struct *sbsec; | |
570bc1c2 | 2515 | u32 newsid, clen; |
5e41ff9e | 2516 | int rc; |
570bc1c2 | 2517 | char *namep = NULL, *context; |
5e41ff9e SS |
2518 | |
2519 | tsec = current->security; | |
2520 | dsec = dir->i_security; | |
2521 | sbsec = dir->i_sb->s_security; | |
5e41ff9e SS |
2522 | |
2523 | if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) { | |
2524 | newsid = tsec->create_sid; | |
2525 | } else { | |
2526 | rc = security_transition_sid(tsec->sid, dsec->sid, | |
2527 | inode_mode_to_security_class(inode->i_mode), | |
2528 | &newsid); | |
2529 | if (rc) { | |
2530 | printk(KERN_WARNING "%s: " | |
2531 | "security_transition_sid failed, rc=%d (dev=%s " | |
2532 | "ino=%ld)\n", | |
dd6f953a | 2533 | __func__, |
5e41ff9e SS |
2534 | -rc, inode->i_sb->s_id, inode->i_ino); |
2535 | return rc; | |
2536 | } | |
2537 | } | |
2538 | ||
296fddf7 EP |
2539 | /* Possibly defer initialization to selinux_complete_init. */ |
2540 | if (sbsec->initialized) { | |
2541 | struct inode_security_struct *isec = inode->i_security; | |
2542 | isec->sclass = inode_mode_to_security_class(inode->i_mode); | |
2543 | isec->sid = newsid; | |
2544 | isec->initialized = 1; | |
2545 | } | |
5e41ff9e | 2546 | |
8aad3875 | 2547 | if (!ss_initialized || sbsec->behavior == SECURITY_FS_USE_MNTPOINT) |
25a74f3b SS |
2548 | return -EOPNOTSUPP; |
2549 | ||
570bc1c2 | 2550 | if (name) { |
a02fe132 | 2551 | namep = kstrdup(XATTR_SELINUX_SUFFIX, GFP_NOFS); |
570bc1c2 SS |
2552 | if (!namep) |
2553 | return -ENOMEM; | |
2554 | *name = namep; | |
2555 | } | |
5e41ff9e | 2556 | |
570bc1c2 | 2557 | if (value && len) { |
12b29f34 | 2558 | rc = security_sid_to_context_force(newsid, &context, &clen); |
570bc1c2 SS |
2559 | if (rc) { |
2560 | kfree(namep); | |
2561 | return rc; | |
2562 | } | |
2563 | *value = context; | |
2564 | *len = clen; | |
5e41ff9e | 2565 | } |
5e41ff9e | 2566 | |
5e41ff9e SS |
2567 | return 0; |
2568 | } | |
2569 | ||
1da177e4 LT |
2570 | static int selinux_inode_create(struct inode *dir, struct dentry *dentry, int mask) |
2571 | { | |
2572 | return may_create(dir, dentry, SECCLASS_FILE); | |
2573 | } | |
2574 | ||
1da177e4 LT |
2575 | static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry) |
2576 | { | |
2577 | int rc; | |
2578 | ||
828dfe1d | 2579 | rc = secondary_ops->inode_link(old_dentry, dir, new_dentry); |
1da177e4 LT |
2580 | if (rc) |
2581 | return rc; | |
2582 | return may_link(dir, old_dentry, MAY_LINK); | |
2583 | } | |
2584 | ||
1da177e4 LT |
2585 | static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry) |
2586 | { | |
2587 | int rc; | |
2588 | ||
2589 | rc = secondary_ops->inode_unlink(dir, dentry); | |
2590 | if (rc) | |
2591 | return rc; | |
2592 | return may_link(dir, dentry, MAY_UNLINK); | |
2593 | } | |
2594 | ||
2595 | static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const char *name) | |
2596 | { | |
2597 | return may_create(dir, dentry, SECCLASS_LNK_FILE); | |
2598 | } | |
2599 | ||
1da177e4 LT |
2600 | static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, int mask) |
2601 | { | |
2602 | return may_create(dir, dentry, SECCLASS_DIR); | |
2603 | } | |
2604 | ||
1da177e4 LT |
2605 | static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry) |
2606 | { | |
2607 | return may_link(dir, dentry, MAY_RMDIR); | |
2608 | } | |
2609 | ||
2610 | static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) | |
2611 | { | |
2612 | int rc; | |
2613 | ||
2614 | rc = secondary_ops->inode_mknod(dir, dentry, mode, dev); | |
2615 | if (rc) | |
2616 | return rc; | |
2617 | ||
2618 | return may_create(dir, dentry, inode_mode_to_security_class(mode)); | |
2619 | } | |
2620 | ||
1da177e4 | 2621 | static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry, |
828dfe1d | 2622 | struct inode *new_inode, struct dentry *new_dentry) |
1da177e4 LT |
2623 | { |
2624 | return may_rename(old_inode, old_dentry, new_inode, new_dentry); | |
2625 | } | |
2626 | ||
1da177e4 LT |
2627 | static int selinux_inode_readlink(struct dentry *dentry) |
2628 | { | |
2629 | return dentry_has_perm(current, NULL, dentry, FILE__READ); | |
2630 | } | |
2631 | ||
2632 | static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *nameidata) | |
2633 | { | |
2634 | int rc; | |
2635 | ||
828dfe1d | 2636 | rc = secondary_ops->inode_follow_link(dentry, nameidata); |
1da177e4 LT |
2637 | if (rc) |
2638 | return rc; | |
2639 | return dentry_has_perm(current, NULL, dentry, FILE__READ); | |
2640 | } | |
2641 | ||
b77b0646 | 2642 | static int selinux_inode_permission(struct inode *inode, int mask) |
1da177e4 LT |
2643 | { |
2644 | int rc; | |
2645 | ||
b77b0646 | 2646 | rc = secondary_ops->inode_permission(inode, mask); |
1da177e4 LT |
2647 | if (rc) |
2648 | return rc; | |
2649 | ||
2650 | if (!mask) { | |
2651 | /* No permission to check. Existence test. */ | |
2652 | return 0; | |
2653 | } | |
2654 | ||
2655 | return inode_has_perm(current, inode, | |
b0c636b9 | 2656 | open_file_mask_to_av(inode->i_mode, mask), NULL); |
1da177e4 LT |
2657 | } |
2658 | ||
2659 | static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
2660 | { | |
2661 | int rc; | |
2662 | ||
2663 | rc = secondary_ops->inode_setattr(dentry, iattr); | |
2664 | if (rc) | |
2665 | return rc; | |
2666 | ||
2667 | if (iattr->ia_valid & ATTR_FORCE) | |
2668 | return 0; | |
2669 | ||
2670 | if (iattr->ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | | |
2671 | ATTR_ATIME_SET | ATTR_MTIME_SET)) | |
2672 | return dentry_has_perm(current, NULL, dentry, FILE__SETATTR); | |
2673 | ||
2674 | return dentry_has_perm(current, NULL, dentry, FILE__WRITE); | |
2675 | } | |
2676 | ||
2677 | static int selinux_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
2678 | { | |
2679 | return dentry_has_perm(current, mnt, dentry, FILE__GETATTR); | |
2680 | } | |
2681 | ||
8f0cfa52 | 2682 | static int selinux_inode_setotherxattr(struct dentry *dentry, const char *name) |
b5376771 SH |
2683 | { |
2684 | if (!strncmp(name, XATTR_SECURITY_PREFIX, | |
2685 | sizeof XATTR_SECURITY_PREFIX - 1)) { | |
2686 | if (!strcmp(name, XATTR_NAME_CAPS)) { | |
2687 | if (!capable(CAP_SETFCAP)) | |
2688 | return -EPERM; | |
2689 | } else if (!capable(CAP_SYS_ADMIN)) { | |
2690 | /* A different attribute in the security namespace. | |
2691 | Restrict to administrator. */ | |
2692 | return -EPERM; | |
2693 | } | |
2694 | } | |
2695 | ||
2696 | /* Not an attribute we recognize, so just check the | |
2697 | ordinary setattr permission. */ | |
2698 | return dentry_has_perm(current, NULL, dentry, FILE__SETATTR); | |
2699 | } | |
2700 | ||
8f0cfa52 DH |
2701 | static int selinux_inode_setxattr(struct dentry *dentry, const char *name, |
2702 | const void *value, size_t size, int flags) | |
1da177e4 LT |
2703 | { |
2704 | struct task_security_struct *tsec = current->security; | |
2705 | struct inode *inode = dentry->d_inode; | |
2706 | struct inode_security_struct *isec = inode->i_security; | |
2707 | struct superblock_security_struct *sbsec; | |
2708 | struct avc_audit_data ad; | |
2709 | u32 newsid; | |
2710 | int rc = 0; | |
2711 | ||
b5376771 SH |
2712 | if (strcmp(name, XATTR_NAME_SELINUX)) |
2713 | return selinux_inode_setotherxattr(dentry, name); | |
1da177e4 LT |
2714 | |
2715 | sbsec = inode->i_sb->s_security; | |
2716 | if (sbsec->behavior == SECURITY_FS_USE_MNTPOINT) | |
2717 | return -EOPNOTSUPP; | |
2718 | ||
3bd858ab | 2719 | if (!is_owner_or_cap(inode)) |
1da177e4 LT |
2720 | return -EPERM; |
2721 | ||
828dfe1d | 2722 | AVC_AUDIT_DATA_INIT(&ad, FS); |
44707fdf | 2723 | ad.u.fs.path.dentry = dentry; |
1da177e4 LT |
2724 | |
2725 | rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass, | |
2726 | FILE__RELABELFROM, &ad); | |
2727 | if (rc) | |
2728 | return rc; | |
2729 | ||
2730 | rc = security_context_to_sid(value, size, &newsid); | |
12b29f34 SS |
2731 | if (rc == -EINVAL) { |
2732 | if (!capable(CAP_MAC_ADMIN)) | |
2733 | return rc; | |
2734 | rc = security_context_to_sid_force(value, size, &newsid); | |
2735 | } | |
1da177e4 LT |
2736 | if (rc) |
2737 | return rc; | |
2738 | ||
2739 | rc = avc_has_perm(tsec->sid, newsid, isec->sclass, | |
2740 | FILE__RELABELTO, &ad); | |
2741 | if (rc) | |
2742 | return rc; | |
2743 | ||
2744 | rc = security_validate_transition(isec->sid, newsid, tsec->sid, | |
828dfe1d | 2745 | isec->sclass); |
1da177e4 LT |
2746 | if (rc) |
2747 | return rc; | |
2748 | ||
2749 | return avc_has_perm(newsid, | |
2750 | sbsec->sid, | |
2751 | SECCLASS_FILESYSTEM, | |
2752 | FILESYSTEM__ASSOCIATE, | |
2753 | &ad); | |
2754 | } | |
2755 | ||
8f0cfa52 | 2756 | static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name, |
f5269710 | 2757 | const void *value, size_t size, |
8f0cfa52 | 2758 | int flags) |
1da177e4 LT |
2759 | { |
2760 | struct inode *inode = dentry->d_inode; | |
2761 | struct inode_security_struct *isec = inode->i_security; | |
2762 | u32 newsid; | |
2763 | int rc; | |
2764 | ||
2765 | if (strcmp(name, XATTR_NAME_SELINUX)) { | |
2766 | /* Not an attribute we recognize, so nothing to do. */ | |
2767 | return; | |
2768 | } | |
2769 | ||
12b29f34 | 2770 | rc = security_context_to_sid_force(value, size, &newsid); |
1da177e4 | 2771 | if (rc) { |
12b29f34 SS |
2772 | printk(KERN_ERR "SELinux: unable to map context to SID" |
2773 | "for (%s, %lu), rc=%d\n", | |
2774 | inode->i_sb->s_id, inode->i_ino, -rc); | |
1da177e4 LT |
2775 | return; |
2776 | } | |
2777 | ||
2778 | isec->sid = newsid; | |
2779 | return; | |
2780 | } | |
2781 | ||
8f0cfa52 | 2782 | static int selinux_inode_getxattr(struct dentry *dentry, const char *name) |
1da177e4 | 2783 | { |
1da177e4 LT |
2784 | return dentry_has_perm(current, NULL, dentry, FILE__GETATTR); |
2785 | } | |
2786 | ||
828dfe1d | 2787 | static int selinux_inode_listxattr(struct dentry *dentry) |
1da177e4 LT |
2788 | { |
2789 | return dentry_has_perm(current, NULL, dentry, FILE__GETATTR); | |
2790 | } | |
2791 | ||
8f0cfa52 | 2792 | static int selinux_inode_removexattr(struct dentry *dentry, const char *name) |
1da177e4 | 2793 | { |
b5376771 SH |
2794 | if (strcmp(name, XATTR_NAME_SELINUX)) |
2795 | return selinux_inode_setotherxattr(dentry, name); | |
1da177e4 LT |
2796 | |
2797 | /* No one is allowed to remove a SELinux security label. | |
2798 | You can change the label, but all data must be labeled. */ | |
2799 | return -EACCES; | |
2800 | } | |
2801 | ||
d381d8a9 | 2802 | /* |
abc69bb6 | 2803 | * Copy the inode security context value to the user. |
d381d8a9 JM |
2804 | * |
2805 | * Permission check is handled by selinux_inode_getxattr hook. | |
2806 | */ | |
42492594 | 2807 | static int selinux_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc) |
1da177e4 | 2808 | { |
42492594 DQ |
2809 | u32 size; |
2810 | int error; | |
2811 | char *context = NULL; | |
abc69bb6 | 2812 | struct task_security_struct *tsec = current->security; |
1da177e4 | 2813 | struct inode_security_struct *isec = inode->i_security; |
d381d8a9 | 2814 | |
8c8570fb DK |
2815 | if (strcmp(name, XATTR_SELINUX_SUFFIX)) |
2816 | return -EOPNOTSUPP; | |
d381d8a9 | 2817 | |
abc69bb6 SS |
2818 | /* |
2819 | * If the caller has CAP_MAC_ADMIN, then get the raw context | |
2820 | * value even if it is not defined by current policy; otherwise, | |
2821 | * use the in-core value under current policy. | |
2822 | * Use the non-auditing forms of the permission checks since | |
2823 | * getxattr may be called by unprivileged processes commonly | |
2824 | * and lack of permission just means that we fall back to the | |
2825 | * in-core context value, not a denial. | |
2826 | */ | |
2827 | error = secondary_ops->capable(current, CAP_MAC_ADMIN); | |
2828 | if (!error) | |
2829 | error = avc_has_perm_noaudit(tsec->sid, tsec->sid, | |
2830 | SECCLASS_CAPABILITY2, | |
2831 | CAPABILITY2__MAC_ADMIN, | |
2832 | 0, | |
2833 | NULL); | |
2834 | if (!error) | |
2835 | error = security_sid_to_context_force(isec->sid, &context, | |
2836 | &size); | |
2837 | else | |
2838 | error = security_sid_to_context(isec->sid, &context, &size); | |
42492594 DQ |
2839 | if (error) |
2840 | return error; | |
2841 | error = size; | |
2842 | if (alloc) { | |
2843 | *buffer = context; | |
2844 | goto out_nofree; | |
2845 | } | |
2846 | kfree(context); | |
2847 | out_nofree: | |
2848 | return error; | |
1da177e4 LT |
2849 | } |
2850 | ||
2851 | static int selinux_inode_setsecurity(struct inode *inode, const char *name, | |
828dfe1d | 2852 | const void *value, size_t size, int flags) |
1da177e4 LT |
2853 | { |
2854 | struct inode_security_struct *isec = inode->i_security; | |
2855 | u32 newsid; | |
2856 | int rc; | |
2857 | ||
2858 | if (strcmp(name, XATTR_SELINUX_SUFFIX)) | |
2859 | return -EOPNOTSUPP; | |
2860 | ||
2861 | if (!value || !size) | |
2862 | return -EACCES; | |
2863 | ||
828dfe1d | 2864 | rc = security_context_to_sid((void *)value, size, &newsid); |
1da177e4 LT |
2865 | if (rc) |
2866 | return rc; | |
2867 | ||
2868 | isec->sid = newsid; | |
2869 | return 0; | |
2870 | } | |
2871 | ||
2872 | static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size) | |
2873 | { | |
2874 | const int len = sizeof(XATTR_NAME_SELINUX); | |
2875 | if (buffer && len <= buffer_size) | |
2876 | memcpy(buffer, XATTR_NAME_SELINUX, len); | |
2877 | return len; | |
2878 | } | |
2879 | ||
b5376771 SH |
2880 | static int selinux_inode_need_killpriv(struct dentry *dentry) |
2881 | { | |
2882 | return secondary_ops->inode_need_killpriv(dentry); | |
2883 | } | |
2884 | ||
2885 | static int selinux_inode_killpriv(struct dentry *dentry) | |
2886 | { | |
2887 | return secondary_ops->inode_killpriv(dentry); | |
2888 | } | |
2889 | ||
713a04ae AD |
2890 | static void selinux_inode_getsecid(const struct inode *inode, u32 *secid) |
2891 | { | |
2892 | struct inode_security_struct *isec = inode->i_security; | |
2893 | *secid = isec->sid; | |
2894 | } | |
2895 | ||
1da177e4 LT |
2896 | /* file security operations */ |
2897 | ||
788e7dd4 | 2898 | static int selinux_revalidate_file_permission(struct file *file, int mask) |
1da177e4 | 2899 | { |
7420ed23 | 2900 | int rc; |
3d5ff529 | 2901 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
2902 | |
2903 | if (!mask) { | |
2904 | /* No permission to check. Existence test. */ | |
2905 | return 0; | |
2906 | } | |
2907 | ||
2908 | /* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */ | |
2909 | if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE)) | |
2910 | mask |= MAY_APPEND; | |
2911 | ||
7420ed23 VY |
2912 | rc = file_has_perm(current, file, |
2913 | file_mask_to_av(inode->i_mode, mask)); | |
2914 | if (rc) | |
2915 | return rc; | |
2916 | ||
2917 | return selinux_netlbl_inode_permission(inode, mask); | |
1da177e4 LT |
2918 | } |
2919 | ||
788e7dd4 YN |
2920 | static int selinux_file_permission(struct file *file, int mask) |
2921 | { | |
2922 | struct inode *inode = file->f_path.dentry->d_inode; | |
2923 | struct task_security_struct *tsec = current->security; | |
2924 | struct file_security_struct *fsec = file->f_security; | |
2925 | struct inode_security_struct *isec = inode->i_security; | |
2926 | ||
2927 | if (!mask) { | |
2928 | /* No permission to check. Existence test. */ | |
2929 | return 0; | |
2930 | } | |
2931 | ||
2932 | if (tsec->sid == fsec->sid && fsec->isid == isec->sid | |
2933 | && fsec->pseqno == avc_policy_seqno()) | |
2934 | return selinux_netlbl_inode_permission(inode, mask); | |
2935 | ||
2936 | return selinux_revalidate_file_permission(file, mask); | |
2937 | } | |
2938 | ||
1da177e4 LT |
2939 | static int selinux_file_alloc_security(struct file *file) |
2940 | { | |
2941 | return file_alloc_security(file); | |
2942 | } | |
2943 | ||
2944 | static void selinux_file_free_security(struct file *file) | |
2945 | { | |
2946 | file_free_security(file); | |
2947 | } | |
2948 | ||
2949 | static int selinux_file_ioctl(struct file *file, unsigned int cmd, | |
2950 | unsigned long arg) | |
2951 | { | |
242631c4 | 2952 | u32 av = 0; |
1da177e4 | 2953 | |
242631c4 SS |
2954 | if (_IOC_DIR(cmd) & _IOC_WRITE) |
2955 | av |= FILE__WRITE; | |
2956 | if (_IOC_DIR(cmd) & _IOC_READ) | |
2957 | av |= FILE__READ; | |
2958 | if (!av) | |
2959 | av = FILE__IOCTL; | |
1da177e4 | 2960 | |
242631c4 | 2961 | return file_has_perm(current, file, av); |
1da177e4 LT |
2962 | } |
2963 | ||
2964 | static int file_map_prot_check(struct file *file, unsigned long prot, int shared) | |
2965 | { | |
2966 | #ifndef CONFIG_PPC32 | |
2967 | if ((prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) { | |
2968 | /* | |
2969 | * We are making executable an anonymous mapping or a | |
2970 | * private file mapping that will also be writable. | |
2971 | * This has an additional check. | |
2972 | */ | |
2973 | int rc = task_has_perm(current, current, PROCESS__EXECMEM); | |
2974 | if (rc) | |
2975 | return rc; | |
2976 | } | |
2977 | #endif | |
2978 | ||
2979 | if (file) { | |
2980 | /* read access is always possible with a mapping */ | |
2981 | u32 av = FILE__READ; | |
2982 | ||
2983 | /* write access only matters if the mapping is shared */ | |
2984 | if (shared && (prot & PROT_WRITE)) | |
2985 | av |= FILE__WRITE; | |
2986 | ||
2987 | if (prot & PROT_EXEC) | |
2988 | av |= FILE__EXECUTE; | |
2989 | ||
2990 | return file_has_perm(current, file, av); | |
2991 | } | |
2992 | return 0; | |
2993 | } | |
2994 | ||
2995 | static int selinux_file_mmap(struct file *file, unsigned long reqprot, | |
ed032189 EP |
2996 | unsigned long prot, unsigned long flags, |
2997 | unsigned long addr, unsigned long addr_only) | |
1da177e4 | 2998 | { |
ed032189 | 2999 | int rc = 0; |
828dfe1d | 3000 | u32 sid = ((struct task_security_struct *)(current->security))->sid; |
1da177e4 | 3001 | |
ed032189 EP |
3002 | if (addr < mmap_min_addr) |
3003 | rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT, | |
3004 | MEMPROTECT__MMAP_ZERO, NULL); | |
3005 | if (rc || addr_only) | |
1da177e4 LT |
3006 | return rc; |
3007 | ||
3008 | if (selinux_checkreqprot) | |
3009 | prot = reqprot; | |
3010 | ||
3011 | return file_map_prot_check(file, prot, | |
3012 | (flags & MAP_TYPE) == MAP_SHARED); | |
3013 | } | |
3014 | ||
3015 | static int selinux_file_mprotect(struct vm_area_struct *vma, | |
3016 | unsigned long reqprot, | |
3017 | unsigned long prot) | |
3018 | { | |
3019 | int rc; | |
3020 | ||
3021 | rc = secondary_ops->file_mprotect(vma, reqprot, prot); | |
3022 | if (rc) | |
3023 | return rc; | |
3024 | ||
3025 | if (selinux_checkreqprot) | |
3026 | prot = reqprot; | |
3027 | ||
3028 | #ifndef CONFIG_PPC32 | |
db4c9641 SS |
3029 | if ((prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) { |
3030 | rc = 0; | |
3031 | if (vma->vm_start >= vma->vm_mm->start_brk && | |
3032 | vma->vm_end <= vma->vm_mm->brk) { | |
3033 | rc = task_has_perm(current, current, | |
3034 | PROCESS__EXECHEAP); | |
3035 | } else if (!vma->vm_file && | |
3036 | vma->vm_start <= vma->vm_mm->start_stack && | |
3037 | vma->vm_end >= vma->vm_mm->start_stack) { | |
3038 | rc = task_has_perm(current, current, PROCESS__EXECSTACK); | |
3039 | } else if (vma->vm_file && vma->anon_vma) { | |
3040 | /* | |
3041 | * We are making executable a file mapping that has | |
3042 | * had some COW done. Since pages might have been | |
3043 | * written, check ability to execute the possibly | |
3044 | * modified content. This typically should only | |
3045 | * occur for text relocations. | |
3046 | */ | |
3047 | rc = file_has_perm(current, vma->vm_file, | |
3048 | FILE__EXECMOD); | |
3049 | } |