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Commit | Line | Data |
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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. | |
12 | * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com> | |
13 | * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc. | |
828dfe1d | 14 | * <dgoeddel@trustedcs.com> |
effad8df | 15 | * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P. |
828dfe1d | 16 | * Paul Moore <paul.moore@hp.com> |
788e7dd4 | 17 | * Copyright (C) 2007 Hitachi Software Engineering Co., Ltd. |
828dfe1d | 18 | * Yuichi Nakamura <ynakam@hitachisoft.jp> |
1da177e4 LT |
19 | * |
20 | * This program is free software; you can redistribute it and/or modify | |
21 | * it under the terms of the GNU General Public License version 2, | |
828dfe1d | 22 | * as published by the Free Software Foundation. |
1da177e4 LT |
23 | */ |
24 | ||
1da177e4 LT |
25 | #include <linux/init.h> |
26 | #include <linux/kernel.h> | |
27 | #include <linux/ptrace.h> | |
28 | #include <linux/errno.h> | |
29 | #include <linux/sched.h> | |
30 | #include <linux/security.h> | |
31 | #include <linux/xattr.h> | |
32 | #include <linux/capability.h> | |
33 | #include <linux/unistd.h> | |
34 | #include <linux/mm.h> | |
35 | #include <linux/mman.h> | |
36 | #include <linux/slab.h> | |
37 | #include <linux/pagemap.h> | |
38 | #include <linux/swap.h> | |
1da177e4 LT |
39 | #include <linux/spinlock.h> |
40 | #include <linux/syscalls.h> | |
41 | #include <linux/file.h> | |
9f3acc31 | 42 | #include <linux/fdtable.h> |
1da177e4 LT |
43 | #include <linux/namei.h> |
44 | #include <linux/mount.h> | |
45 | #include <linux/ext2_fs.h> | |
46 | #include <linux/proc_fs.h> | |
47 | #include <linux/kd.h> | |
48 | #include <linux/netfilter_ipv4.h> | |
49 | #include <linux/netfilter_ipv6.h> | |
50 | #include <linux/tty.h> | |
51 | #include <net/icmp.h> | |
227b60f5 | 52 | #include <net/ip.h> /* for local_port_range[] */ |
1da177e4 | 53 | #include <net/tcp.h> /* struct or_callable used in sock_rcv_skb */ |
220deb96 | 54 | #include <net/net_namespace.h> |
d621d35e | 55 | #include <net/netlabel.h> |
f5269710 | 56 | #include <linux/uaccess.h> |
1da177e4 | 57 | #include <asm/ioctls.h> |
d621d35e | 58 | #include <asm/atomic.h> |
1da177e4 LT |
59 | #include <linux/bitops.h> |
60 | #include <linux/interrupt.h> | |
61 | #include <linux/netdevice.h> /* for network interface checks */ | |
62 | #include <linux/netlink.h> | |
63 | #include <linux/tcp.h> | |
64 | #include <linux/udp.h> | |
2ee92d46 | 65 | #include <linux/dccp.h> |
1da177e4 LT |
66 | #include <linux/quota.h> |
67 | #include <linux/un.h> /* for Unix socket types */ | |
68 | #include <net/af_unix.h> /* for Unix socket types */ | |
69 | #include <linux/parser.h> | |
70 | #include <linux/nfs_mount.h> | |
71 | #include <net/ipv6.h> | |
72 | #include <linux/hugetlb.h> | |
73 | #include <linux/personality.h> | |
74 | #include <linux/sysctl.h> | |
75 | #include <linux/audit.h> | |
6931dfc9 | 76 | #include <linux/string.h> |
877ce7c1 | 77 | #include <linux/selinux.h> |
23970741 | 78 | #include <linux/mutex.h> |
1da177e4 LT |
79 | |
80 | #include "avc.h" | |
81 | #include "objsec.h" | |
82 | #include "netif.h" | |
224dfbd8 | 83 | #include "netnode.h" |
3e112172 | 84 | #include "netport.h" |
d28d1e08 | 85 | #include "xfrm.h" |
c60475bf | 86 | #include "netlabel.h" |
9d57a7f9 | 87 | #include "audit.h" |
1da177e4 LT |
88 | |
89 | #define XATTR_SELINUX_SUFFIX "selinux" | |
90 | #define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX | |
91 | ||
c9180a57 EP |
92 | #define NUM_SEL_MNT_OPTS 4 |
93 | ||
1da177e4 LT |
94 | extern unsigned int policydb_loaded_version; |
95 | extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm); | |
4e5ab4cb | 96 | extern int selinux_compat_net; |
20510f2f | 97 | extern struct security_operations *security_ops; |
1da177e4 | 98 | |
d621d35e PM |
99 | /* SECMARK reference count */ |
100 | atomic_t selinux_secmark_refcount = ATOMIC_INIT(0); | |
101 | ||
1da177e4 | 102 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP |
828dfe1d | 103 | int selinux_enforcing; |
1da177e4 LT |
104 | |
105 | static int __init enforcing_setup(char *str) | |
106 | { | |
f5269710 EP |
107 | unsigned long enforcing; |
108 | if (!strict_strtoul(str, 0, &enforcing)) | |
109 | selinux_enforcing = enforcing ? 1 : 0; | |
1da177e4 LT |
110 | return 1; |
111 | } | |
112 | __setup("enforcing=", enforcing_setup); | |
113 | #endif | |
114 | ||
115 | #ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM | |
116 | int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE; | |
117 | ||
118 | static int __init selinux_enabled_setup(char *str) | |
119 | { | |
f5269710 EP |
120 | unsigned long enabled; |
121 | if (!strict_strtoul(str, 0, &enabled)) | |
122 | selinux_enabled = enabled ? 1 : 0; | |
1da177e4 LT |
123 | return 1; |
124 | } | |
125 | __setup("selinux=", selinux_enabled_setup); | |
30d55280 SS |
126 | #else |
127 | int selinux_enabled = 1; | |
1da177e4 LT |
128 | #endif |
129 | ||
130 | /* Original (dummy) security module. */ | |
828dfe1d | 131 | static struct security_operations *original_ops; |
1da177e4 LT |
132 | |
133 | /* Minimal support for a secondary security module, | |
134 | just to allow the use of the dummy or capability modules. | |
135 | The owlsm module can alternatively be used as a secondary | |
136 | module as long as CONFIG_OWLSM_FD is not enabled. */ | |
828dfe1d | 137 | static struct security_operations *secondary_ops; |
1da177e4 LT |
138 | |
139 | /* Lists of inode and superblock security structures initialized | |
140 | before the policy was loaded. */ | |
141 | static LIST_HEAD(superblock_security_head); | |
142 | static DEFINE_SPINLOCK(sb_security_lock); | |
143 | ||
e18b890b | 144 | static struct kmem_cache *sel_inode_cache; |
7cae7e26 | 145 | |
d621d35e PM |
146 | /** |
147 | * selinux_secmark_enabled - Check to see if SECMARK is currently enabled | |
148 | * | |
149 | * Description: | |
150 | * This function checks the SECMARK reference counter to see if any SECMARK | |
151 | * targets are currently configured, if the reference counter is greater than | |
152 | * zero SECMARK is considered to be enabled. Returns true (1) if SECMARK is | |
153 | * enabled, false (0) if SECMARK is disabled. | |
154 | * | |
155 | */ | |
156 | static int selinux_secmark_enabled(void) | |
157 | { | |
158 | return (atomic_read(&selinux_secmark_refcount) > 0); | |
159 | } | |
160 | ||
1da177e4 LT |
161 | /* Allocate and free functions for each kind of security blob. */ |
162 | ||
163 | static int task_alloc_security(struct task_struct *task) | |
164 | { | |
165 | struct task_security_struct *tsec; | |
166 | ||
89d155ef | 167 | tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL); |
1da177e4 LT |
168 | if (!tsec) |
169 | return -ENOMEM; | |
170 | ||
0356357c | 171 | tsec->osid = tsec->sid = SECINITSID_UNLABELED; |
1da177e4 LT |
172 | task->security = tsec; |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
177 | static void task_free_security(struct task_struct *task) | |
178 | { | |
179 | struct task_security_struct *tsec = task->security; | |
1da177e4 LT |
180 | task->security = NULL; |
181 | kfree(tsec); | |
182 | } | |
183 | ||
184 | static int inode_alloc_security(struct inode *inode) | |
185 | { | |
186 | struct task_security_struct *tsec = current->security; | |
187 | struct inode_security_struct *isec; | |
188 | ||
a02fe132 | 189 | isec = kmem_cache_zalloc(sel_inode_cache, GFP_NOFS); |
1da177e4 LT |
190 | if (!isec) |
191 | return -ENOMEM; | |
192 | ||
23970741 | 193 | mutex_init(&isec->lock); |
1da177e4 | 194 | INIT_LIST_HEAD(&isec->list); |
1da177e4 LT |
195 | isec->inode = inode; |
196 | isec->sid = SECINITSID_UNLABELED; | |
197 | isec->sclass = SECCLASS_FILE; | |
9ac49d22 | 198 | isec->task_sid = tsec->sid; |
1da177e4 LT |
199 | inode->i_security = isec; |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
204 | static void inode_free_security(struct inode *inode) | |
205 | { | |
206 | struct inode_security_struct *isec = inode->i_security; | |
207 | struct superblock_security_struct *sbsec = inode->i_sb->s_security; | |
208 | ||
1da177e4 LT |
209 | spin_lock(&sbsec->isec_lock); |
210 | if (!list_empty(&isec->list)) | |
211 | list_del_init(&isec->list); | |
212 | spin_unlock(&sbsec->isec_lock); | |
213 | ||
214 | inode->i_security = NULL; | |
7cae7e26 | 215 | kmem_cache_free(sel_inode_cache, isec); |
1da177e4 LT |
216 | } |
217 | ||
218 | static int file_alloc_security(struct file *file) | |
219 | { | |
220 | struct task_security_struct *tsec = current->security; | |
221 | struct file_security_struct *fsec; | |
222 | ||
26d2a4be | 223 | fsec = kzalloc(sizeof(struct file_security_struct), GFP_KERNEL); |
1da177e4 LT |
224 | if (!fsec) |
225 | return -ENOMEM; | |
226 | ||
9ac49d22 SS |
227 | fsec->sid = tsec->sid; |
228 | fsec->fown_sid = tsec->sid; | |
1da177e4 LT |
229 | file->f_security = fsec; |
230 | ||
231 | return 0; | |
232 | } | |
233 | ||
234 | static void file_free_security(struct file *file) | |
235 | { | |
236 | struct file_security_struct *fsec = file->f_security; | |
1da177e4 LT |
237 | file->f_security = NULL; |
238 | kfree(fsec); | |
239 | } | |
240 | ||
241 | static int superblock_alloc_security(struct super_block *sb) | |
242 | { | |
243 | struct superblock_security_struct *sbsec; | |
244 | ||
89d155ef | 245 | sbsec = kzalloc(sizeof(struct superblock_security_struct), GFP_KERNEL); |
1da177e4 LT |
246 | if (!sbsec) |
247 | return -ENOMEM; | |
248 | ||
bc7e982b | 249 | mutex_init(&sbsec->lock); |
1da177e4 LT |
250 | INIT_LIST_HEAD(&sbsec->list); |
251 | INIT_LIST_HEAD(&sbsec->isec_head); | |
252 | spin_lock_init(&sbsec->isec_lock); | |
1da177e4 LT |
253 | sbsec->sb = sb; |
254 | sbsec->sid = SECINITSID_UNLABELED; | |
255 | sbsec->def_sid = SECINITSID_FILE; | |
c312feb2 | 256 | sbsec->mntpoint_sid = SECINITSID_UNLABELED; |
1da177e4 LT |
257 | sb->s_security = sbsec; |
258 | ||
259 | return 0; | |
260 | } | |
261 | ||
262 | static void superblock_free_security(struct super_block *sb) | |
263 | { | |
264 | struct superblock_security_struct *sbsec = sb->s_security; | |
265 | ||
1da177e4 LT |
266 | spin_lock(&sb_security_lock); |
267 | if (!list_empty(&sbsec->list)) | |
268 | list_del_init(&sbsec->list); | |
269 | spin_unlock(&sb_security_lock); | |
270 | ||
271 | sb->s_security = NULL; | |
272 | kfree(sbsec); | |
273 | } | |
274 | ||
7d877f3b | 275 | static int sk_alloc_security(struct sock *sk, int family, gfp_t priority) |
1da177e4 LT |
276 | { |
277 | struct sk_security_struct *ssec; | |
278 | ||
89d155ef | 279 | ssec = kzalloc(sizeof(*ssec), priority); |
1da177e4 LT |
280 | if (!ssec) |
281 | return -ENOMEM; | |
282 | ||
1da177e4 | 283 | ssec->peer_sid = SECINITSID_UNLABELED; |
892c141e | 284 | ssec->sid = SECINITSID_UNLABELED; |
1da177e4 LT |
285 | sk->sk_security = ssec; |
286 | ||
f74af6e8 | 287 | selinux_netlbl_sk_security_reset(ssec, family); |
99f59ed0 | 288 | |
1da177e4 LT |
289 | return 0; |
290 | } | |
291 | ||
292 | static void sk_free_security(struct sock *sk) | |
293 | { | |
294 | struct sk_security_struct *ssec = sk->sk_security; | |
295 | ||
1da177e4 LT |
296 | sk->sk_security = NULL; |
297 | kfree(ssec); | |
298 | } | |
1da177e4 LT |
299 | |
300 | /* The security server must be initialized before | |
301 | any labeling or access decisions can be provided. */ | |
302 | extern int ss_initialized; | |
303 | ||
304 | /* The file system's label must be initialized prior to use. */ | |
305 | ||
306 | static char *labeling_behaviors[6] = { | |
307 | "uses xattr", | |
308 | "uses transition SIDs", | |
309 | "uses task SIDs", | |
310 | "uses genfs_contexts", | |
311 | "not configured for labeling", | |
312 | "uses mountpoint labeling", | |
313 | }; | |
314 | ||
315 | static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry); | |
316 | ||
317 | static inline int inode_doinit(struct inode *inode) | |
318 | { | |
319 | return inode_doinit_with_dentry(inode, NULL); | |
320 | } | |
321 | ||
322 | enum { | |
31e87930 | 323 | Opt_error = -1, |
1da177e4 LT |
324 | Opt_context = 1, |
325 | Opt_fscontext = 2, | |
c9180a57 EP |
326 | Opt_defcontext = 3, |
327 | Opt_rootcontext = 4, | |
1da177e4 LT |
328 | }; |
329 | ||
330 | static match_table_t tokens = { | |
832cbd9a EP |
331 | {Opt_context, CONTEXT_STR "%s"}, |
332 | {Opt_fscontext, FSCONTEXT_STR "%s"}, | |
333 | {Opt_defcontext, DEFCONTEXT_STR "%s"}, | |
334 | {Opt_rootcontext, ROOTCONTEXT_STR "%s"}, | |
31e87930 | 335 | {Opt_error, NULL}, |
1da177e4 LT |
336 | }; |
337 | ||
338 | #define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n" | |
339 | ||
c312feb2 EP |
340 | static int may_context_mount_sb_relabel(u32 sid, |
341 | struct superblock_security_struct *sbsec, | |
342 | struct task_security_struct *tsec) | |
343 | { | |
344 | int rc; | |
345 | ||
346 | rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, | |
347 | FILESYSTEM__RELABELFROM, NULL); | |
348 | if (rc) | |
349 | return rc; | |
350 | ||
351 | rc = avc_has_perm(tsec->sid, sid, SECCLASS_FILESYSTEM, | |
352 | FILESYSTEM__RELABELTO, NULL); | |
353 | return rc; | |
354 | } | |
355 | ||
0808925e EP |
356 | static int may_context_mount_inode_relabel(u32 sid, |
357 | struct superblock_security_struct *sbsec, | |
358 | struct task_security_struct *tsec) | |
359 | { | |
360 | int rc; | |
361 | rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, | |
362 | FILESYSTEM__RELABELFROM, NULL); | |
363 | if (rc) | |
364 | return rc; | |
365 | ||
366 | rc = avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, | |
367 | FILESYSTEM__ASSOCIATE, NULL); | |
368 | return rc; | |
369 | } | |
370 | ||
c9180a57 | 371 | static int sb_finish_set_opts(struct super_block *sb) |
1da177e4 | 372 | { |
1da177e4 | 373 | struct superblock_security_struct *sbsec = sb->s_security; |
c9180a57 EP |
374 | struct dentry *root = sb->s_root; |
375 | struct inode *root_inode = root->d_inode; | |
376 | int rc = 0; | |
1da177e4 | 377 | |
c9180a57 EP |
378 | if (sbsec->behavior == SECURITY_FS_USE_XATTR) { |
379 | /* Make sure that the xattr handler exists and that no | |
380 | error other than -ENODATA is returned by getxattr on | |
381 | the root directory. -ENODATA is ok, as this may be | |
382 | the first boot of the SELinux kernel before we have | |
383 | assigned xattr values to the filesystem. */ | |
384 | if (!root_inode->i_op->getxattr) { | |
385 | printk(KERN_WARNING "SELinux: (dev %s, type %s) has no " | |
386 | "xattr support\n", sb->s_id, sb->s_type->name); | |
387 | rc = -EOPNOTSUPP; | |
388 | goto out; | |
389 | } | |
390 | rc = root_inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0); | |
391 | if (rc < 0 && rc != -ENODATA) { | |
392 | if (rc == -EOPNOTSUPP) | |
393 | printk(KERN_WARNING "SELinux: (dev %s, type " | |
394 | "%s) has no security xattr handler\n", | |
395 | sb->s_id, sb->s_type->name); | |
396 | else | |
397 | printk(KERN_WARNING "SELinux: (dev %s, type " | |
398 | "%s) getxattr errno %d\n", sb->s_id, | |
399 | sb->s_type->name, -rc); | |
400 | goto out; | |
401 | } | |
402 | } | |
1da177e4 | 403 | |
c9180a57 | 404 | sbsec->initialized = 1; |
1da177e4 | 405 | |
c9180a57 EP |
406 | if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors)) |
407 | printk(KERN_ERR "SELinux: initialized (dev %s, type %s), unknown behavior\n", | |
408 | sb->s_id, sb->s_type->name); | |
409 | else | |
410 | printk(KERN_DEBUG "SELinux: initialized (dev %s, type %s), %s\n", | |
411 | sb->s_id, sb->s_type->name, | |
412 | labeling_behaviors[sbsec->behavior-1]); | |
1da177e4 | 413 | |
c9180a57 EP |
414 | /* Initialize the root inode. */ |
415 | rc = inode_doinit_with_dentry(root_inode, root); | |
1da177e4 | 416 | |
c9180a57 EP |
417 | /* Initialize any other inodes associated with the superblock, e.g. |
418 | inodes created prior to initial policy load or inodes created | |
419 | during get_sb by a pseudo filesystem that directly | |
420 | populates itself. */ | |
421 | spin_lock(&sbsec->isec_lock); | |
422 | next_inode: | |
423 | if (!list_empty(&sbsec->isec_head)) { | |
424 | struct inode_security_struct *isec = | |
425 | list_entry(sbsec->isec_head.next, | |
426 | struct inode_security_struct, list); | |
427 | struct inode *inode = isec->inode; | |
428 | spin_unlock(&sbsec->isec_lock); | |
429 | inode = igrab(inode); | |
430 | if (inode) { | |
431 | if (!IS_PRIVATE(inode)) | |
432 | inode_doinit(inode); | |
433 | iput(inode); | |
434 | } | |
435 | spin_lock(&sbsec->isec_lock); | |
436 | list_del_init(&isec->list); | |
437 | goto next_inode; | |
438 | } | |
439 | spin_unlock(&sbsec->isec_lock); | |
440 | out: | |
441 | return rc; | |
442 | } | |
1da177e4 | 443 | |
c9180a57 EP |
444 | /* |
445 | * This function should allow an FS to ask what it's mount security | |
446 | * options were so it can use those later for submounts, displaying | |
447 | * mount options, or whatever. | |
448 | */ | |
449 | static int selinux_get_mnt_opts(const struct super_block *sb, | |
e0007529 | 450 | struct security_mnt_opts *opts) |
c9180a57 EP |
451 | { |
452 | int rc = 0, i; | |
453 | struct superblock_security_struct *sbsec = sb->s_security; | |
454 | char *context = NULL; | |
455 | u32 len; | |
456 | char tmp; | |
1da177e4 | 457 | |
e0007529 | 458 | security_init_mnt_opts(opts); |
1da177e4 | 459 | |
c9180a57 EP |
460 | if (!sbsec->initialized) |
461 | return -EINVAL; | |
1da177e4 | 462 | |
c9180a57 EP |
463 | if (!ss_initialized) |
464 | return -EINVAL; | |
1da177e4 | 465 | |
c9180a57 EP |
466 | /* |
467 | * if we ever use sbsec flags for anything other than tracking mount | |
468 | * settings this is going to need a mask | |
469 | */ | |
470 | tmp = sbsec->flags; | |
471 | /* count the number of mount options for this sb */ | |
472 | for (i = 0; i < 8; i++) { | |
473 | if (tmp & 0x01) | |
e0007529 | 474 | opts->num_mnt_opts++; |
c9180a57 EP |
475 | tmp >>= 1; |
476 | } | |
1da177e4 | 477 | |
e0007529 EP |
478 | opts->mnt_opts = kcalloc(opts->num_mnt_opts, sizeof(char *), GFP_ATOMIC); |
479 | if (!opts->mnt_opts) { | |
c9180a57 EP |
480 | rc = -ENOMEM; |
481 | goto out_free; | |
482 | } | |
1da177e4 | 483 | |
e0007529 EP |
484 | opts->mnt_opts_flags = kcalloc(opts->num_mnt_opts, sizeof(int), GFP_ATOMIC); |
485 | if (!opts->mnt_opts_flags) { | |
c9180a57 EP |
486 | rc = -ENOMEM; |
487 | goto out_free; | |
488 | } | |
1da177e4 | 489 | |
c9180a57 EP |
490 | i = 0; |
491 | if (sbsec->flags & FSCONTEXT_MNT) { | |
492 | rc = security_sid_to_context(sbsec->sid, &context, &len); | |
493 | if (rc) | |
494 | goto out_free; | |
e0007529 EP |
495 | opts->mnt_opts[i] = context; |
496 | opts->mnt_opts_flags[i++] = FSCONTEXT_MNT; | |
c9180a57 EP |
497 | } |
498 | if (sbsec->flags & CONTEXT_MNT) { | |
499 | rc = security_sid_to_context(sbsec->mntpoint_sid, &context, &len); | |
500 | if (rc) | |
501 | goto out_free; | |
e0007529 EP |
502 | opts->mnt_opts[i] = context; |
503 | opts->mnt_opts_flags[i++] = CONTEXT_MNT; | |
c9180a57 EP |
504 | } |
505 | if (sbsec->flags & DEFCONTEXT_MNT) { | |
506 | rc = security_sid_to_context(sbsec->def_sid, &context, &len); | |
507 | if (rc) | |
508 | goto out_free; | |
e0007529 EP |
509 | opts->mnt_opts[i] = context; |
510 | opts->mnt_opts_flags[i++] = DEFCONTEXT_MNT; | |
c9180a57 EP |
511 | } |
512 | if (sbsec->flags & ROOTCONTEXT_MNT) { | |
513 | struct inode *root = sbsec->sb->s_root->d_inode; | |
514 | struct inode_security_struct *isec = root->i_security; | |
0808925e | 515 | |
c9180a57 EP |
516 | rc = security_sid_to_context(isec->sid, &context, &len); |
517 | if (rc) | |
518 | goto out_free; | |
e0007529 EP |
519 | opts->mnt_opts[i] = context; |
520 | opts->mnt_opts_flags[i++] = ROOTCONTEXT_MNT; | |
c9180a57 | 521 | } |
1da177e4 | 522 | |
e0007529 | 523 | BUG_ON(i != opts->num_mnt_opts); |
1da177e4 | 524 | |
c9180a57 EP |
525 | return 0; |
526 | ||
527 | out_free: | |
e0007529 | 528 | security_free_mnt_opts(opts); |
c9180a57 EP |
529 | return rc; |
530 | } | |
1da177e4 | 531 | |
c9180a57 EP |
532 | static int bad_option(struct superblock_security_struct *sbsec, char flag, |
533 | u32 old_sid, u32 new_sid) | |
534 | { | |
535 | /* check if the old mount command had the same options */ | |
536 | if (sbsec->initialized) | |
537 | if (!(sbsec->flags & flag) || | |
538 | (old_sid != new_sid)) | |
539 | return 1; | |
540 | ||
541 | /* check if we were passed the same options twice, | |
542 | * aka someone passed context=a,context=b | |
543 | */ | |
544 | if (!sbsec->initialized) | |
545 | if (sbsec->flags & flag) | |
546 | return 1; | |
547 | return 0; | |
548 | } | |
e0007529 | 549 | |
c9180a57 EP |
550 | /* |
551 | * Allow filesystems with binary mount data to explicitly set mount point | |
552 | * labeling information. | |
553 | */ | |
e0007529 EP |
554 | static int selinux_set_mnt_opts(struct super_block *sb, |
555 | struct security_mnt_opts *opts) | |
c9180a57 EP |
556 | { |
557 | int rc = 0, i; | |
558 | struct task_security_struct *tsec = current->security; | |
559 | struct superblock_security_struct *sbsec = sb->s_security; | |
560 | const char *name = sb->s_type->name; | |
561 | struct inode *inode = sbsec->sb->s_root->d_inode; | |
562 | struct inode_security_struct *root_isec = inode->i_security; | |
563 | u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0; | |
564 | u32 defcontext_sid = 0; | |
e0007529 EP |
565 | char **mount_options = opts->mnt_opts; |
566 | int *flags = opts->mnt_opts_flags; | |
567 | int num_opts = opts->num_mnt_opts; | |
c9180a57 EP |
568 | |
569 | mutex_lock(&sbsec->lock); | |
570 | ||
571 | if (!ss_initialized) { | |
572 | if (!num_opts) { | |
573 | /* Defer initialization until selinux_complete_init, | |
574 | after the initial policy is loaded and the security | |
575 | server is ready to handle calls. */ | |
576 | spin_lock(&sb_security_lock); | |
577 | if (list_empty(&sbsec->list)) | |
578 | list_add(&sbsec->list, &superblock_security_head); | |
579 | spin_unlock(&sb_security_lock); | |
580 | goto out; | |
581 | } | |
582 | rc = -EINVAL; | |
744ba35e EP |
583 | printk(KERN_WARNING "SELinux: Unable to set superblock options " |
584 | "before the security server is initialized\n"); | |
1da177e4 | 585 | goto out; |
c9180a57 | 586 | } |
1da177e4 | 587 | |
e0007529 EP |
588 | /* |
589 | * Binary mount data FS will come through this function twice. Once | |
590 | * from an explicit call and once from the generic calls from the vfs. | |
591 | * Since the generic VFS calls will not contain any security mount data | |
592 | * we need to skip the double mount verification. | |
593 | * | |
594 | * This does open a hole in which we will not notice if the first | |
595 | * mount using this sb set explict options and a second mount using | |
596 | * this sb does not set any security options. (The first options | |
597 | * will be used for both mounts) | |
598 | */ | |
599 | if (sbsec->initialized && (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) | |
600 | && (num_opts == 0)) | |
f5269710 | 601 | goto out; |
e0007529 | 602 | |
c9180a57 EP |
603 | /* |
604 | * parse the mount options, check if they are valid sids. | |
605 | * also check if someone is trying to mount the same sb more | |
606 | * than once with different security options. | |
607 | */ | |
608 | for (i = 0; i < num_opts; i++) { | |
609 | u32 sid; | |
610 | rc = security_context_to_sid(mount_options[i], | |
611 | strlen(mount_options[i]), &sid); | |
1da177e4 LT |
612 | if (rc) { |
613 | printk(KERN_WARNING "SELinux: security_context_to_sid" | |
614 | "(%s) failed for (dev %s, type %s) errno=%d\n", | |
c9180a57 EP |
615 | mount_options[i], sb->s_id, name, rc); |
616 | goto out; | |
617 | } | |
618 | switch (flags[i]) { | |
619 | case FSCONTEXT_MNT: | |
620 | fscontext_sid = sid; | |
621 | ||
622 | if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, | |
623 | fscontext_sid)) | |
624 | goto out_double_mount; | |
625 | ||
626 | sbsec->flags |= FSCONTEXT_MNT; | |
627 | break; | |
628 | case CONTEXT_MNT: | |
629 | context_sid = sid; | |
630 | ||
631 | if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, | |
632 | context_sid)) | |
633 | goto out_double_mount; | |
634 | ||
635 | sbsec->flags |= CONTEXT_MNT; | |
636 | break; | |
637 | case ROOTCONTEXT_MNT: | |
638 | rootcontext_sid = sid; | |
639 | ||
640 | if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, | |
641 | rootcontext_sid)) | |
642 | goto out_double_mount; | |
643 | ||
644 | sbsec->flags |= ROOTCONTEXT_MNT; | |
645 | ||
646 | break; | |
647 | case DEFCONTEXT_MNT: | |
648 | defcontext_sid = sid; | |
649 | ||
650 | if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, | |
651 | defcontext_sid)) | |
652 | goto out_double_mount; | |
653 | ||
654 | sbsec->flags |= DEFCONTEXT_MNT; | |
655 | ||
656 | break; | |
657 | default: | |
658 | rc = -EINVAL; | |
659 | goto out; | |
1da177e4 | 660 | } |
c9180a57 EP |
661 | } |
662 | ||
663 | if (sbsec->initialized) { | |
664 | /* previously mounted with options, but not on this attempt? */ | |
665 | if (sbsec->flags && !num_opts) | |
666 | goto out_double_mount; | |
667 | rc = 0; | |
668 | goto out; | |
669 | } | |
670 | ||
671 | if (strcmp(sb->s_type->name, "proc") == 0) | |
672 | sbsec->proc = 1; | |
673 | ||
674 | /* Determine the labeling behavior to use for this filesystem type. */ | |
675 | rc = security_fs_use(sb->s_type->name, &sbsec->behavior, &sbsec->sid); | |
676 | if (rc) { | |
677 | printk(KERN_WARNING "%s: security_fs_use(%s) returned %d\n", | |
dd6f953a | 678 | __func__, sb->s_type->name, rc); |
c9180a57 EP |
679 | goto out; |
680 | } | |
1da177e4 | 681 | |
c9180a57 EP |
682 | /* sets the context of the superblock for the fs being mounted. */ |
683 | if (fscontext_sid) { | |
684 | ||
685 | rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, tsec); | |
1da177e4 | 686 | if (rc) |
c9180a57 | 687 | goto out; |
1da177e4 | 688 | |
c9180a57 | 689 | sbsec->sid = fscontext_sid; |
c312feb2 EP |
690 | } |
691 | ||
692 | /* | |
693 | * Switch to using mount point labeling behavior. | |
694 | * sets the label used on all file below the mountpoint, and will set | |
695 | * the superblock context if not already set. | |
696 | */ | |
c9180a57 EP |
697 | if (context_sid) { |
698 | if (!fscontext_sid) { | |
699 | rc = may_context_mount_sb_relabel(context_sid, sbsec, tsec); | |
b04ea3ce | 700 | if (rc) |
c9180a57 EP |
701 | goto out; |
702 | sbsec->sid = context_sid; | |
b04ea3ce | 703 | } else { |
c9180a57 | 704 | rc = may_context_mount_inode_relabel(context_sid, sbsec, tsec); |
b04ea3ce | 705 | if (rc) |
c9180a57 | 706 | goto out; |
b04ea3ce | 707 | } |
c9180a57 EP |
708 | if (!rootcontext_sid) |
709 | rootcontext_sid = context_sid; | |
1da177e4 | 710 | |
c9180a57 | 711 | sbsec->mntpoint_sid = context_sid; |
c312feb2 | 712 | sbsec->behavior = SECURITY_FS_USE_MNTPOINT; |
1da177e4 LT |
713 | } |
714 | ||
c9180a57 EP |
715 | if (rootcontext_sid) { |
716 | rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec, tsec); | |
0808925e | 717 | if (rc) |
c9180a57 | 718 | goto out; |
0808925e | 719 | |
c9180a57 EP |
720 | root_isec->sid = rootcontext_sid; |
721 | root_isec->initialized = 1; | |
0808925e EP |
722 | } |
723 | ||
c9180a57 EP |
724 | if (defcontext_sid) { |
725 | if (sbsec->behavior != SECURITY_FS_USE_XATTR) { | |
726 | rc = -EINVAL; | |
727 | printk(KERN_WARNING "SELinux: defcontext option is " | |
728 | "invalid for this filesystem type\n"); | |
729 | goto out; | |
1da177e4 LT |
730 | } |
731 | ||
c9180a57 EP |
732 | if (defcontext_sid != sbsec->def_sid) { |
733 | rc = may_context_mount_inode_relabel(defcontext_sid, | |
734 | sbsec, tsec); | |
735 | if (rc) | |
736 | goto out; | |
737 | } | |
1da177e4 | 738 | |
c9180a57 | 739 | sbsec->def_sid = defcontext_sid; |
1da177e4 LT |
740 | } |
741 | ||
c9180a57 | 742 | rc = sb_finish_set_opts(sb); |
1da177e4 | 743 | out: |
c9180a57 | 744 | mutex_unlock(&sbsec->lock); |
1da177e4 | 745 | return rc; |
c9180a57 EP |
746 | out_double_mount: |
747 | rc = -EINVAL; | |
748 | printk(KERN_WARNING "SELinux: mount invalid. Same superblock, different " | |
749 | "security settings for (dev %s, type %s)\n", sb->s_id, name); | |
750 | goto out; | |
1da177e4 LT |
751 | } |
752 | ||
c9180a57 EP |
753 | static void selinux_sb_clone_mnt_opts(const struct super_block *oldsb, |
754 | struct super_block *newsb) | |
1da177e4 | 755 | { |
c9180a57 EP |
756 | const struct superblock_security_struct *oldsbsec = oldsb->s_security; |
757 | struct superblock_security_struct *newsbsec = newsb->s_security; | |
1da177e4 | 758 | |
c9180a57 EP |
759 | int set_fscontext = (oldsbsec->flags & FSCONTEXT_MNT); |
760 | int set_context = (oldsbsec->flags & CONTEXT_MNT); | |
761 | int set_rootcontext = (oldsbsec->flags & ROOTCONTEXT_MNT); | |
1da177e4 | 762 | |
0f5e6420 EP |
763 | /* |
764 | * if the parent was able to be mounted it clearly had no special lsm | |
765 | * mount options. thus we can safely put this sb on the list and deal | |
766 | * with it later | |
767 | */ | |
768 | if (!ss_initialized) { | |
769 | spin_lock(&sb_security_lock); | |
770 | if (list_empty(&newsbsec->list)) | |
771 | list_add(&newsbsec->list, &superblock_security_head); | |
772 | spin_unlock(&sb_security_lock); | |
773 | return; | |
774 | } | |
c9180a57 | 775 | |
c9180a57 EP |
776 | /* how can we clone if the old one wasn't set up?? */ |
777 | BUG_ON(!oldsbsec->initialized); | |
778 | ||
5a552617 EP |
779 | /* if fs is reusing a sb, just let its options stand... */ |
780 | if (newsbsec->initialized) | |
781 | return; | |
782 | ||
c9180a57 EP |
783 | mutex_lock(&newsbsec->lock); |
784 | ||
785 | newsbsec->flags = oldsbsec->flags; | |
786 | ||
787 | newsbsec->sid = oldsbsec->sid; | |
788 | newsbsec->def_sid = oldsbsec->def_sid; | |
789 | newsbsec->behavior = oldsbsec->behavior; | |
790 | ||
791 | if (set_context) { | |
792 | u32 sid = oldsbsec->mntpoint_sid; | |
793 | ||
794 | if (!set_fscontext) | |
795 | newsbsec->sid = sid; | |
796 | if (!set_rootcontext) { | |
797 | struct inode *newinode = newsb->s_root->d_inode; | |
798 | struct inode_security_struct *newisec = newinode->i_security; | |
799 | newisec->sid = sid; | |
800 | } | |
801 | newsbsec->mntpoint_sid = sid; | |
1da177e4 | 802 | } |
c9180a57 EP |
803 | if (set_rootcontext) { |
804 | const struct inode *oldinode = oldsb->s_root->d_inode; | |
805 | const struct inode_security_struct *oldisec = oldinode->i_security; | |
806 | struct inode *newinode = newsb->s_root->d_inode; | |
807 | struct inode_security_struct *newisec = newinode->i_security; | |
1da177e4 | 808 | |
c9180a57 | 809 | newisec->sid = oldisec->sid; |
1da177e4 LT |
810 | } |
811 | ||
c9180a57 EP |
812 | sb_finish_set_opts(newsb); |
813 | mutex_unlock(&newsbsec->lock); | |
814 | } | |
815 | ||
2e1479d9 AB |
816 | static int selinux_parse_opts_str(char *options, |
817 | struct security_mnt_opts *opts) | |
c9180a57 | 818 | { |
e0007529 | 819 | char *p; |
c9180a57 EP |
820 | char *context = NULL, *defcontext = NULL; |
821 | char *fscontext = NULL, *rootcontext = NULL; | |
e0007529 | 822 | int rc, num_mnt_opts = 0; |
1da177e4 | 823 | |
e0007529 | 824 | opts->num_mnt_opts = 0; |
1da177e4 | 825 | |
c9180a57 EP |
826 | /* Standard string-based options. */ |
827 | while ((p = strsep(&options, "|")) != NULL) { | |
828 | int token; | |
829 | substring_t args[MAX_OPT_ARGS]; | |
1da177e4 | 830 | |
c9180a57 EP |
831 | if (!*p) |
832 | continue; | |
1da177e4 | 833 | |
c9180a57 | 834 | token = match_token(p, tokens, args); |
1da177e4 | 835 | |
c9180a57 EP |
836 | switch (token) { |
837 | case Opt_context: | |
838 | if (context || defcontext) { | |
839 | rc = -EINVAL; | |
840 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); | |
841 | goto out_err; | |
842 | } | |
843 | context = match_strdup(&args[0]); | |
844 | if (!context) { | |
845 | rc = -ENOMEM; | |
846 | goto out_err; | |
847 | } | |
848 | break; | |
849 | ||
850 | case Opt_fscontext: | |
851 | if (fscontext) { | |
852 | rc = -EINVAL; | |
853 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); | |
854 | goto out_err; | |
855 | } | |
856 | fscontext = match_strdup(&args[0]); | |
857 | if (!fscontext) { | |
858 | rc = -ENOMEM; | |
859 | goto out_err; | |
860 | } | |
861 | break; | |
862 | ||
863 | case Opt_rootcontext: | |
864 | if (rootcontext) { | |
865 | rc = -EINVAL; | |
866 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); | |
867 | goto out_err; | |
868 | } | |
869 | rootcontext = match_strdup(&args[0]); | |
870 | if (!rootcontext) { | |
871 | rc = -ENOMEM; | |
872 | goto out_err; | |
873 | } | |
874 | break; | |
875 | ||
876 | case Opt_defcontext: | |
877 | if (context || defcontext) { | |
878 | rc = -EINVAL; | |
879 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); | |
880 | goto out_err; | |
881 | } | |
882 | defcontext = match_strdup(&args[0]); | |
883 | if (!defcontext) { | |
884 | rc = -ENOMEM; | |
885 | goto out_err; | |
886 | } | |
887 | break; | |
888 | ||
889 | default: | |
890 | rc = -EINVAL; | |
891 | printk(KERN_WARNING "SELinux: unknown mount option\n"); | |
892 | goto out_err; | |
1da177e4 | 893 | |
1da177e4 | 894 | } |
1da177e4 | 895 | } |
c9180a57 | 896 | |
e0007529 EP |
897 | rc = -ENOMEM; |
898 | opts->mnt_opts = kcalloc(NUM_SEL_MNT_OPTS, sizeof(char *), GFP_ATOMIC); | |
899 | if (!opts->mnt_opts) | |
900 | goto out_err; | |
901 | ||
902 | opts->mnt_opts_flags = kcalloc(NUM_SEL_MNT_OPTS, sizeof(int), GFP_ATOMIC); | |
903 | if (!opts->mnt_opts_flags) { | |
904 | kfree(opts->mnt_opts); | |
905 | goto out_err; | |
906 | } | |
907 | ||
c9180a57 | 908 | if (fscontext) { |
e0007529 EP |
909 | opts->mnt_opts[num_mnt_opts] = fscontext; |
910 | opts->mnt_opts_flags[num_mnt_opts++] = FSCONTEXT_MNT; | |
c9180a57 EP |
911 | } |
912 | if (context) { | |
e0007529 EP |
913 | opts->mnt_opts[num_mnt_opts] = context; |
914 | opts->mnt_opts_flags[num_mnt_opts++] = CONTEXT_MNT; | |
c9180a57 EP |
915 | } |
916 | if (rootcontext) { | |
e0007529 EP |
917 | opts->mnt_opts[num_mnt_opts] = rootcontext; |
918 | opts->mnt_opts_flags[num_mnt_opts++] = ROOTCONTEXT_MNT; | |
c9180a57 EP |
919 | } |
920 | if (defcontext) { | |
e0007529 EP |
921 | opts->mnt_opts[num_mnt_opts] = defcontext; |
922 | opts->mnt_opts_flags[num_mnt_opts++] = DEFCONTEXT_MNT; | |
c9180a57 EP |
923 | } |
924 | ||
e0007529 EP |
925 | opts->num_mnt_opts = num_mnt_opts; |
926 | return 0; | |
927 | ||
c9180a57 EP |
928 | out_err: |
929 | kfree(context); | |
930 | kfree(defcontext); | |
931 | kfree(fscontext); | |
932 | kfree(rootcontext); | |
1da177e4 LT |
933 | return rc; |
934 | } | |
e0007529 EP |
935 | /* |
936 | * string mount options parsing and call set the sbsec | |
937 | */ | |
938 | static int superblock_doinit(struct super_block *sb, void *data) | |
939 | { | |
940 | int rc = 0; | |
941 | char *options = data; | |
942 | struct security_mnt_opts opts; | |
943 | ||
944 | security_init_mnt_opts(&opts); | |
945 | ||
946 | if (!data) | |
947 | goto out; | |
948 | ||
949 | BUG_ON(sb->s_type->fs_flags & FS_BINARY_MOUNTDATA); | |
950 | ||
951 | rc = selinux_parse_opts_str(options, &opts); | |
952 | if (rc) | |
953 | goto out_err; | |
954 | ||
955 | out: | |
956 | rc = selinux_set_mnt_opts(sb, &opts); | |
957 | ||
958 | out_err: | |
959 | security_free_mnt_opts(&opts); | |
960 | return rc; | |
961 | } | |
1da177e4 LT |
962 | |
963 | static inline u16 inode_mode_to_security_class(umode_t mode) | |
964 | { | |
965 | switch (mode & S_IFMT) { | |
966 | case S_IFSOCK: | |
967 | return SECCLASS_SOCK_FILE; | |
968 | case S_IFLNK: | |
969 | return SECCLASS_LNK_FILE; | |
970 | case S_IFREG: | |
971 | return SECCLASS_FILE; | |
972 | case S_IFBLK: | |
973 | return SECCLASS_BLK_FILE; | |
974 | case S_IFDIR: | |
975 | return SECCLASS_DIR; | |
976 | case S_IFCHR: | |
977 | return SECCLASS_CHR_FILE; | |
978 | case S_IFIFO: | |
979 | return SECCLASS_FIFO_FILE; | |
980 | ||
981 | } | |
982 | ||
983 | return SECCLASS_FILE; | |
984 | } | |
985 | ||
13402580 JM |
986 | static inline int default_protocol_stream(int protocol) |
987 | { | |
988 | return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP); | |
989 | } | |
990 | ||
991 | static inline int default_protocol_dgram(int protocol) | |
992 | { | |
993 | return (protocol == IPPROTO_IP || protocol == IPPROTO_UDP); | |
994 | } | |
995 | ||
1da177e4 LT |
996 | static inline u16 socket_type_to_security_class(int family, int type, int protocol) |
997 | { | |
998 | switch (family) { | |
999 | case PF_UNIX: | |
1000 | switch (type) { | |
1001 | case SOCK_STREAM: | |
1002 | case SOCK_SEQPACKET: | |
1003 | return SECCLASS_UNIX_STREAM_SOCKET; | |
1004 | case SOCK_DGRAM: | |
1005 | return SECCLASS_UNIX_DGRAM_SOCKET; | |
1006 | } | |
1007 | break; | |
1008 | case PF_INET: | |
1009 | case PF_INET6: | |
1010 | switch (type) { | |
1011 | case SOCK_STREAM: | |
13402580 JM |
1012 | if (default_protocol_stream(protocol)) |
1013 | return SECCLASS_TCP_SOCKET; | |
1014 | else | |
1015 | return SECCLASS_RAWIP_SOCKET; | |
1da177e4 | 1016 | case SOCK_DGRAM: |
13402580 JM |
1017 | if (default_protocol_dgram(protocol)) |
1018 | return SECCLASS_UDP_SOCKET; | |
1019 | else | |
1020 | return SECCLASS_RAWIP_SOCKET; | |
2ee92d46 JM |
1021 | case SOCK_DCCP: |
1022 | return SECCLASS_DCCP_SOCKET; | |
13402580 | 1023 | default: |
1da177e4 LT |
1024 | return SECCLASS_RAWIP_SOCKET; |
1025 | } | |
1026 | break; | |
1027 | case PF_NETLINK: | |
1028 | switch (protocol) { | |
1029 | case NETLINK_ROUTE: | |
1030 | return SECCLASS_NETLINK_ROUTE_SOCKET; | |
1031 | case NETLINK_FIREWALL: | |
1032 | return SECCLASS_NETLINK_FIREWALL_SOCKET; | |
216efaaa | 1033 | case NETLINK_INET_DIAG: |
1da177e4 LT |
1034 | return SECCLASS_NETLINK_TCPDIAG_SOCKET; |
1035 | case NETLINK_NFLOG: | |
1036 | return SECCLASS_NETLINK_NFLOG_SOCKET; | |
1037 | case NETLINK_XFRM: | |
1038 | return SECCLASS_NETLINK_XFRM_SOCKET; | |
1039 | case NETLINK_SELINUX: | |
1040 | return SECCLASS_NETLINK_SELINUX_SOCKET; | |
1041 | case NETLINK_AUDIT: | |
1042 | return SECCLASS_NETLINK_AUDIT_SOCKET; | |
1043 | case NETLINK_IP6_FW: | |
1044 | return SECCLASS_NETLINK_IP6FW_SOCKET; | |
1045 | case NETLINK_DNRTMSG: | |
1046 | return SECCLASS_NETLINK_DNRT_SOCKET; | |
0c9b7942 JM |
1047 | case NETLINK_KOBJECT_UEVENT: |
1048 | return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET; | |
1da177e4 LT |
1049 | default: |
1050 | return SECCLASS_NETLINK_SOCKET; | |
1051 | } | |
1052 | case PF_PACKET: | |
1053 | return SECCLASS_PACKET_SOCKET; | |
1054 | case PF_KEY: | |
1055 | return SECCLASS_KEY_SOCKET; | |
3e3ff15e CP |
1056 | case PF_APPLETALK: |
1057 | return SECCLASS_APPLETALK_SOCKET; | |
1da177e4 LT |
1058 | } |
1059 | ||
1060 | return SECCLASS_SOCKET; | |
1061 | } | |
1062 | ||
1063 | #ifdef CONFIG_PROC_FS | |
1064 | static int selinux_proc_get_sid(struct proc_dir_entry *de, | |
1065 | u16 tclass, | |
1066 | u32 *sid) | |
1067 | { | |
1068 | int buflen, rc; | |
1069 | char *buffer, *path, *end; | |
1070 | ||
828dfe1d | 1071 | buffer = (char *)__get_free_page(GFP_KERNEL); |
1da177e4 LT |
1072 | if (!buffer) |
1073 | return -ENOMEM; | |
1074 | ||
1075 | buflen = PAGE_SIZE; | |
1076 | end = buffer+buflen; | |
1077 | *--end = '\0'; | |
1078 | buflen--; | |
1079 | path = end-1; | |
1080 | *path = '/'; | |
1081 | while (de && de != de->parent) { | |
1082 | buflen -= de->namelen + 1; | |
1083 | if (buflen < 0) | |
1084 | break; | |
1085 | end -= de->namelen; | |
1086 | memcpy(end, de->name, de->namelen); | |
1087 | *--end = '/'; | |
1088 | path = end; | |
1089 | de = de->parent; | |
1090 | } | |
1091 | rc = security_genfs_sid("proc", path, tclass, sid); | |
1092 | free_page((unsigned long)buffer); | |
1093 | return rc; | |
1094 | } | |
1095 | #else | |
1096 | static int selinux_proc_get_sid(struct proc_dir_entry *de, | |
1097 | u16 tclass, | |
1098 | u32 *sid) | |
1099 | { | |
1100 | return -EINVAL; | |
1101 | } | |
1102 | #endif | |
1103 | ||
1104 | /* The inode's security attributes must be initialized before first use. */ | |
1105 | static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry) | |
1106 | { | |
1107 | struct superblock_security_struct *sbsec = NULL; | |
1108 | struct inode_security_struct *isec = inode->i_security; | |
1109 | u32 sid; | |
1110 | struct dentry *dentry; | |
1111 | #define INITCONTEXTLEN 255 | |
1112 | char *context = NULL; | |
1113 | unsigned len = 0; | |
1114 | int rc = 0; | |
1da177e4 LT |
1115 | |
1116 | if (isec->initialized) | |
1117 | goto out; | |
1118 | ||
23970741 | 1119 | mutex_lock(&isec->lock); |
1da177e4 | 1120 | if (isec->initialized) |
23970741 | 1121 | goto out_unlock; |
1da177e4 LT |
1122 | |
1123 | sbsec = inode->i_sb->s_security; | |
1124 | if (!sbsec->initialized) { | |
1125 | /* Defer initialization until selinux_complete_init, | |
1126 | after the initial policy is loaded and the security | |
1127 | server is ready to handle calls. */ | |
1128 | spin_lock(&sbsec->isec_lock); | |
1129 | if (list_empty(&isec->list)) | |
1130 | list_add(&isec->list, &sbsec->isec_head); | |
1131 | spin_unlock(&sbsec->isec_lock); | |
23970741 | 1132 | goto out_unlock; |
1da177e4 LT |
1133 | } |
1134 | ||
1135 | switch (sbsec->behavior) { | |
1136 | case SECURITY_FS_USE_XATTR: | |
1137 | if (!inode->i_op->getxattr) { | |
1138 | isec->sid = sbsec->def_sid; | |
1139 | break; | |
1140 | } | |
1141 | ||
1142 | /* Need a dentry, since the xattr API requires one. | |
1143 | Life would be simpler if we could just pass the inode. */ | |
1144 | if (opt_dentry) { | |
1145 | /* Called from d_instantiate or d_splice_alias. */ | |
1146 | dentry = dget(opt_dentry); | |
1147 | } else { | |
1148 | /* Called from selinux_complete_init, try to find a dentry. */ | |
1149 | dentry = d_find_alias(inode); | |
1150 | } | |
1151 | if (!dentry) { | |
744ba35e | 1152 | printk(KERN_WARNING "SELinux: %s: no dentry for dev=%s " |
dd6f953a | 1153 | "ino=%ld\n", __func__, inode->i_sb->s_id, |
1da177e4 | 1154 | inode->i_ino); |
23970741 | 1155 | goto out_unlock; |
1da177e4 LT |
1156 | } |
1157 | ||
1158 | len = INITCONTEXTLEN; | |
869ab514 | 1159 | context = kmalloc(len, GFP_NOFS); |
1da177e4 LT |
1160 | if (!context) { |
1161 | rc = -ENOMEM; | |
1162 | dput(dentry); | |
23970741 | 1163 | goto out_unlock; |
1da177e4 LT |
1164 | } |
1165 | rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, | |
1166 | context, len); | |
1167 | if (rc == -ERANGE) { | |
1168 | /* Need a larger buffer. Query for the right size. */ | |
1169 | rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, | |
1170 | NULL, 0); | |
1171 | if (rc < 0) { | |
1172 | dput(dentry); | |
23970741 | 1173 | goto out_unlock; |
1da177e4 LT |
1174 | } |
1175 | kfree(context); | |
1176 | len = rc; | |
869ab514 | 1177 | context = kmalloc(len, GFP_NOFS); |
1da177e4 LT |
1178 | if (!context) { |
1179 | rc = -ENOMEM; | |
1180 | dput(dentry); | |
23970741 | 1181 | goto out_unlock; |
1da177e4 LT |
1182 | } |
1183 | rc = inode->i_op->getxattr(dentry, | |
1184 | XATTR_NAME_SELINUX, | |
1185 | context, len); | |
1186 | } | |
1187 | dput(dentry); | |
1188 | if (rc < 0) { | |
1189 | if (rc != -ENODATA) { | |
744ba35e | 1190 | printk(KERN_WARNING "SELinux: %s: getxattr returned " |
dd6f953a | 1191 | "%d for dev=%s ino=%ld\n", __func__, |
1da177e4 LT |
1192 | -rc, inode->i_sb->s_id, inode->i_ino); |
1193 | kfree(context); | |
23970741 | 1194 | goto out_unlock; |
1da177e4 LT |
1195 | } |
1196 | /* Map ENODATA to the default file SID */ | |
1197 | sid = sbsec->def_sid; | |
1198 | rc = 0; | |
1199 | } else { | |
f5c1d5b2 | 1200 | rc = security_context_to_sid_default(context, rc, &sid, |
869ab514 SS |
1201 | sbsec->def_sid, |
1202 | GFP_NOFS); | |
1da177e4 | 1203 | if (rc) { |
744ba35e | 1204 | printk(KERN_WARNING "SELinux: %s: context_to_sid(%s) " |
1da177e4 | 1205 | "returned %d for dev=%s ino=%ld\n", |
dd6f953a | 1206 | __func__, context, -rc, |
1da177e4 LT |
1207 | inode->i_sb->s_id, inode->i_ino); |
1208 | kfree(context); | |
1209 | /* Leave with the unlabeled SID */ | |
1210 | rc = 0; | |
1211 | break; | |
1212 | } | |
1213 | } | |
1214 | kfree(context); | |
1215 | isec->sid = sid; | |
1216 | break; | |
1217 | case SECURITY_FS_USE_TASK: | |
1218 | isec->sid = isec->task_sid; | |
1219 | break; | |
1220 | case SECURITY_FS_USE_TRANS: | |
1221 | /* Default to the fs SID. */ | |
1222 | isec->sid = sbsec->sid; | |
1223 | ||
1224 | /* Try to obtain a transition SID. */ | |
1225 | isec->sclass = inode_mode_to_security_class(inode->i_mode); | |
1226 | rc = security_transition_sid(isec->task_sid, | |
1227 | sbsec->sid, | |
1228 | isec->sclass, | |
1229 | &sid); | |
1230 | if (rc) | |
23970741 | 1231 | goto out_unlock; |
1da177e4 LT |
1232 | isec->sid = sid; |
1233 | break; | |
c312feb2 EP |
1234 | case SECURITY_FS_USE_MNTPOINT: |
1235 | isec->sid = sbsec->mntpoint_sid; | |
1236 | break; | |
1da177e4 | 1237 | default: |
c312feb2 | 1238 | /* Default to the fs superblock SID. */ |
1da177e4 LT |
1239 | isec->sid = sbsec->sid; |
1240 | ||
1241 | if (sbsec->proc) { | |
1242 | struct proc_inode *proci = PROC_I(inode); | |
1243 | if (proci->pde) { | |
1244 | isec->sclass = inode_mode_to_security_class(inode->i_mode); | |
1245 | rc = selinux_proc_get_sid(proci->pde, | |
1246 | isec->sclass, | |
1247 | &sid); | |
1248 | if (rc) | |
23970741 | 1249 | goto out_unlock; |
1da177e4 LT |
1250 | isec->sid = sid; |
1251 | } | |
1252 | } | |
1253 | break; | |
1254 | } | |
1255 | ||
1256 | isec->initialized = 1; | |
1257 | ||
23970741 EP |
1258 | out_unlock: |
1259 | mutex_unlock(&isec->lock); | |
1da177e4 LT |
1260 | out: |
1261 | if (isec->sclass == SECCLASS_FILE) | |
1262 | isec->sclass = inode_mode_to_security_class(inode->i_mode); | |
1da177e4 LT |
1263 | return rc; |
1264 | } | |
1265 | ||
1266 | /* Convert a Linux signal to an access vector. */ | |
1267 | static inline u32 signal_to_av(int sig) | |
1268 | { | |
1269 | u32 perm = 0; | |
1270 | ||
1271 | switch (sig) { | |
1272 | case SIGCHLD: | |
1273 | /* Commonly granted from child to parent. */ | |
1274 | perm = PROCESS__SIGCHLD; | |
1275 | break; | |
1276 | case SIGKILL: | |
1277 | /* Cannot be caught or ignored */ | |
1278 | perm = PROCESS__SIGKILL; | |
1279 | break; | |
1280 | case SIGSTOP: | |
1281 | /* Cannot be caught or ignored */ | |
1282 | perm = PROCESS__SIGSTOP; | |
1283 | break; | |
1284 | default: | |
1285 | /* All other signals. */ | |
1286 | perm = PROCESS__SIGNAL; | |
1287 | break; | |
1288 | } | |
1289 | ||
1290 | return perm; | |
1291 | } | |
1292 | ||
1293 | /* Check permission betweeen a pair of tasks, e.g. signal checks, | |
1294 | fork check, ptrace check, etc. */ | |
1295 | static int task_has_perm(struct task_struct *tsk1, | |
1296 | struct task_struct *tsk2, | |
1297 | u32 perms) | |
1298 | { | |
1299 | struct task_security_struct *tsec1, *tsec2; | |
1300 | ||
1301 | tsec1 = tsk1->security; | |
1302 | tsec2 = tsk2->security; | |
1303 | return avc_has_perm(tsec1->sid, tsec2->sid, | |
1304 | SECCLASS_PROCESS, perms, NULL); | |
1305 | } | |
1306 | ||
b68e418c SS |
1307 | #if CAP_LAST_CAP > 63 |
1308 | #error Fix SELinux to handle capabilities > 63. | |
1309 | #endif | |
1310 | ||
1da177e4 LT |
1311 | /* Check whether a task is allowed to use a capability. */ |
1312 | static int task_has_capability(struct task_struct *tsk, | |
1313 | int cap) | |
1314 | { | |
1315 | struct task_security_struct *tsec; | |
1316 | struct avc_audit_data ad; | |
b68e418c SS |
1317 | u16 sclass; |
1318 | u32 av = CAP_TO_MASK(cap); | |
1da177e4 LT |
1319 | |
1320 | tsec = tsk->security; | |
1321 | ||
828dfe1d | 1322 | AVC_AUDIT_DATA_INIT(&ad, CAP); |
1da177e4 LT |
1323 | ad.tsk = tsk; |
1324 | ad.u.cap = cap; | |
1325 | ||
b68e418c SS |
1326 | switch (CAP_TO_INDEX(cap)) { |
1327 | case 0: | |
1328 | sclass = SECCLASS_CAPABILITY; | |
1329 | break; | |
1330 | case 1: | |
1331 | sclass = SECCLASS_CAPABILITY2; | |
1332 | break; | |
1333 | default: | |
1334 | printk(KERN_ERR | |
1335 | "SELinux: out of range capability %d\n", cap); | |
1336 | BUG(); | |
1337 | } | |
1338 | return avc_has_perm(tsec->sid, tsec->sid, sclass, av, &ad); | |
1da177e4 LT |
1339 | } |
1340 | ||
1341 | /* Check whether a task is allowed to use a system operation. */ | |
1342 | static int task_has_system(struct task_struct *tsk, | |
1343 | u32 perms) | |
1344 | { | |
1345 | struct task_security_struct *tsec; | |
1346 | ||
1347 | tsec = tsk->security; | |
1348 | ||
1349 | return avc_has_perm(tsec->sid, SECINITSID_KERNEL, | |
1350 | SECCLASS_SYSTEM, perms, NULL); | |
1351 | } | |
1352 | ||
1353 | /* Check whether a task has a particular permission to an inode. | |
1354 | The 'adp' parameter is optional and allows other audit | |
1355 | data to be passed (e.g. the dentry). */ | |
1356 | static int inode_has_perm(struct task_struct *tsk, | |
1357 | struct inode *inode, | |
1358 | u32 perms, | |
1359 | struct avc_audit_data *adp) | |
1360 | { | |
1361 | struct task_security_struct *tsec; | |
1362 | struct inode_security_struct *isec; | |
1363 | struct avc_audit_data ad; | |
1364 | ||
828dfe1d | 1365 | if (unlikely(IS_PRIVATE(inode))) |
bbaca6c2 SS |
1366 | return 0; |
1367 | ||
1da177e4 LT |
1368 | tsec = tsk->security; |
1369 | isec = inode->i_security; | |
1370 | ||
1371 | if (!adp) { | |
1372 | adp = &ad; | |
1373 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
1374 | ad.u.fs.inode = inode; | |
1375 | } | |
1376 | ||
1377 | return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, adp); | |
1378 | } | |
1379 | ||
1380 | /* Same as inode_has_perm, but pass explicit audit data containing | |
1381 | the dentry to help the auditing code to more easily generate the | |
1382 | pathname if needed. */ | |
1383 | static inline int dentry_has_perm(struct task_struct *tsk, | |
1384 | struct vfsmount *mnt, | |
1385 | struct dentry *dentry, | |
1386 | u32 av) | |
1387 | { | |
1388 | struct inode *inode = dentry->d_inode; | |
1389 | struct avc_audit_data ad; | |
828dfe1d | 1390 | AVC_AUDIT_DATA_INIT(&ad, FS); |
44707fdf JB |
1391 | ad.u.fs.path.mnt = mnt; |
1392 | ad.u.fs.path.dentry = dentry; | |
1da177e4 LT |
1393 | return inode_has_perm(tsk, inode, av, &ad); |
1394 | } | |
1395 | ||
1396 | /* Check whether a task can use an open file descriptor to | |
1397 | access an inode in a given way. Check access to the | |
1398 | descriptor itself, and then use dentry_has_perm to | |
1399 | check a particular permission to the file. | |
1400 | Access to the descriptor is implicitly granted if it | |
1401 | has the same SID as the process. If av is zero, then | |
1402 | access to the file is not checked, e.g. for cases | |
1403 | where only the descriptor is affected like seek. */ | |
858119e1 | 1404 | static int file_has_perm(struct task_struct *tsk, |
1da177e4 LT |
1405 | struct file *file, |
1406 | u32 av) | |
1407 | { | |
1408 | struct task_security_struct *tsec = tsk->security; | |
1409 | struct file_security_struct *fsec = file->f_security; | |
44707fdf | 1410 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1411 | struct avc_audit_data ad; |
1412 | int rc; | |
1413 | ||
1414 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
44707fdf | 1415 | ad.u.fs.path = file->f_path; |
1da177e4 LT |
1416 | |
1417 | if (tsec->sid != fsec->sid) { | |
1418 | rc = avc_has_perm(tsec->sid, fsec->sid, | |
1419 | SECCLASS_FD, | |
1420 | FD__USE, | |
1421 | &ad); | |
1422 | if (rc) | |
1423 | return rc; | |
1424 | } | |
1425 | ||
1426 | /* av is zero if only checking access to the descriptor. */ | |
1427 | if (av) | |
1428 | return inode_has_perm(tsk, inode, av, &ad); | |
1429 | ||
1430 | return 0; | |
1431 | } | |
1432 | ||
1433 | /* Check whether a task can create a file. */ | |
1434 | static int may_create(struct inode *dir, | |
1435 | struct dentry *dentry, | |
1436 | u16 tclass) | |
1437 | { | |
1438 | struct task_security_struct *tsec; | |
1439 | struct inode_security_struct *dsec; | |
1440 | struct superblock_security_struct *sbsec; | |
1441 | u32 newsid; | |
1442 | struct avc_audit_data ad; | |
1443 | int rc; | |
1444 | ||
1445 | tsec = current->security; | |
1446 | dsec = dir->i_security; | |
1447 | sbsec = dir->i_sb->s_security; | |
1448 | ||
1449 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
44707fdf | 1450 | ad.u.fs.path.dentry = dentry; |
1da177e4 LT |
1451 | |
1452 | rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR, | |
1453 | DIR__ADD_NAME | DIR__SEARCH, | |
1454 | &ad); | |
1455 | if (rc) | |
1456 | return rc; | |
1457 | ||
1458 | if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) { | |
1459 | newsid = tsec->create_sid; | |
1460 | } else { | |
1461 | rc = security_transition_sid(tsec->sid, dsec->sid, tclass, | |
1462 | &newsid); | |
1463 | if (rc) | |
1464 | return rc; | |
1465 | } | |
1466 | ||
1467 | rc = avc_has_perm(tsec->sid, newsid, tclass, FILE__CREATE, &ad); | |
1468 | if (rc) | |
1469 | return rc; | |
1470 | ||
1471 | return avc_has_perm(newsid, sbsec->sid, | |
1472 | SECCLASS_FILESYSTEM, | |
1473 | FILESYSTEM__ASSOCIATE, &ad); | |
1474 | } | |
1475 | ||
4eb582cf ML |
1476 | /* Check whether a task can create a key. */ |
1477 | static int may_create_key(u32 ksid, | |
1478 | struct task_struct *ctx) | |
1479 | { | |
1480 | struct task_security_struct *tsec; | |
1481 | ||
1482 | tsec = ctx->security; | |
1483 | ||
1484 | return avc_has_perm(tsec->sid, ksid, SECCLASS_KEY, KEY__CREATE, NULL); | |
1485 | } | |
1486 | ||
828dfe1d EP |
1487 | #define MAY_LINK 0 |
1488 | #define MAY_UNLINK 1 | |
1489 | #define MAY_RMDIR 2 | |
1da177e4 LT |
1490 | |
1491 | /* Check whether a task can link, unlink, or rmdir a file/directory. */ | |
1492 | static int may_link(struct inode *dir, | |
1493 | struct dentry *dentry, | |
1494 | int kind) | |
1495 | ||
1496 | { | |
1497 | struct task_security_struct *tsec; | |
1498 | struct inode_security_struct *dsec, *isec; | |
1499 | struct avc_audit_data ad; | |
1500 | u32 av; | |
1501 | int rc; | |
1502 | ||
1503 | tsec = current->security; | |
1504 | dsec = dir->i_security; | |
1505 | isec = dentry->d_inode->i_security; | |
1506 | ||
1507 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
44707fdf | 1508 | ad.u.fs.path.dentry = dentry; |
1da177e4 LT |
1509 | |
1510 | av = DIR__SEARCH; | |
1511 | av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME); | |
1512 | rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR, av, &ad); | |
1513 | if (rc) | |
1514 | return rc; | |
1515 | ||
1516 | switch (kind) { | |
1517 | case MAY_LINK: | |
1518 | av = FILE__LINK; | |
1519 | break; | |
1520 | case MAY_UNLINK: | |
1521 | av = FILE__UNLINK; | |
1522 | break; | |
1523 | case MAY_RMDIR: | |
1524 | av = DIR__RMDIR; | |
1525 | break; | |
1526 | default: | |
744ba35e EP |
1527 | printk(KERN_WARNING "SELinux: %s: unrecognized kind %d\n", |
1528 | __func__, kind); | |
1da177e4 LT |
1529 | return 0; |
1530 | } | |
1531 | ||
1532 | rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass, av, &ad); | |
1533 | return rc; | |
1534 | } | |
1535 | ||
1536 | static inline int may_rename(struct inode *old_dir, | |
1537 | struct dentry *old_dentry, | |
1538 | struct inode *new_dir, | |
1539 | struct dentry *new_dentry) | |
1540 | { | |
1541 | struct task_security_struct *tsec; | |
1542 | struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec; | |
1543 | struct avc_audit_data ad; | |
1544 | u32 av; | |
1545 | int old_is_dir, new_is_dir; | |
1546 | int rc; | |
1547 | ||
1548 | tsec = current->security; | |
1549 | old_dsec = old_dir->i_security; | |
1550 | old_isec = old_dentry->d_inode->i_security; | |
1551 | old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode); | |
1552 | new_dsec = new_dir->i_security; | |
1553 | ||
1554 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
1555 | ||
44707fdf | 1556 | ad.u.fs.path.dentry = old_dentry; |
1da177e4 LT |
1557 | rc = avc_has_perm(tsec->sid, old_dsec->sid, SECCLASS_DIR, |
1558 | DIR__REMOVE_NAME | DIR__SEARCH, &ad); | |
1559 | if (rc) | |
1560 | return rc; | |
1561 | rc = avc_has_perm(tsec->sid, old_isec->sid, | |
1562 | old_isec->sclass, FILE__RENAME, &ad); | |
1563 | if (rc) | |
1564 | return rc; | |
1565 | if (old_is_dir && new_dir != old_dir) { | |
1566 | rc = avc_has_perm(tsec->sid, old_isec->sid, | |
1567 | old_isec->sclass, DIR__REPARENT, &ad); | |
1568 | if (rc) | |
1569 | return rc; | |
1570 | } | |
1571 | ||
44707fdf | 1572 | ad.u.fs.path.dentry = new_dentry; |
1da177e4 LT |
1573 | av = DIR__ADD_NAME | DIR__SEARCH; |
1574 | if (new_dentry->d_inode) | |
1575 | av |= DIR__REMOVE_NAME; | |
1576 | rc = avc_has_perm(tsec->sid, new_dsec->sid, SECCLASS_DIR, av, &ad); | |
1577 | if (rc) | |
1578 | return rc; | |
1579 | if (new_dentry->d_inode) { | |
1580 | new_isec = new_dentry->d_inode->i_security; | |
1581 | new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode); | |
1582 | rc = avc_has_perm(tsec->sid, new_isec->sid, | |
1583 | new_isec->sclass, | |
1584 | (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad); | |
1585 | if (rc) | |
1586 | return rc; | |
1587 | } | |
1588 | ||
1589 | return 0; | |
1590 | } | |
1591 | ||
1592 | /* Check whether a task can perform a filesystem operation. */ | |
1593 | static int superblock_has_perm(struct task_struct *tsk, | |
1594 | struct super_block *sb, | |
1595 | u32 perms, | |
1596 | struct avc_audit_data *ad) | |
1597 | { | |
1598 | struct task_security_struct *tsec; | |
1599 | struct superblock_security_struct *sbsec; | |
1600 | ||
1601 | tsec = tsk->security; | |
1602 | sbsec = sb->s_security; | |
1603 | return avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, | |
1604 | perms, ad); | |
1605 | } | |
1606 | ||
1607 | /* Convert a Linux mode and permission mask to an access vector. */ | |
1608 | static inline u32 file_mask_to_av(int mode, int mask) | |
1609 | { | |
1610 | u32 av = 0; | |
1611 | ||
1612 | if ((mode & S_IFMT) != S_IFDIR) { | |
1613 | if (mask & MAY_EXEC) | |
1614 | av |= FILE__EXECUTE; | |
1615 | if (mask & MAY_READ) | |
1616 | av |= FILE__READ; | |
1617 | ||
1618 | if (mask & MAY_APPEND) | |
1619 | av |= FILE__APPEND; | |
1620 | else if (mask & MAY_WRITE) | |
1621 | av |= FILE__WRITE; | |
1622 | ||
1623 | } else { | |
1624 | if (mask & MAY_EXEC) | |
1625 | av |= DIR__SEARCH; | |
1626 | if (mask & MAY_WRITE) | |
1627 | av |= DIR__WRITE; | |
1628 | if (mask & MAY_READ) | |
1629 | av |= DIR__READ; | |
1630 | } | |
1631 | ||
1632 | return av; | |
1633 | } | |
1634 | ||
b0c636b9 EP |
1635 | /* |
1636 | * Convert a file mask to an access vector and include the correct open | |
1637 | * open permission. | |
1638 | */ | |
1639 | static inline u32 open_file_mask_to_av(int mode, int mask) | |
1640 | { | |
1641 | u32 av = file_mask_to_av(mode, mask); | |
1642 | ||
1643 | if (selinux_policycap_openperm) { | |
1644 | /* | |
1645 | * lnk files and socks do not really have an 'open' | |
1646 | */ | |
1647 | if (S_ISREG(mode)) | |
1648 | av |= FILE__OPEN; | |
1649 | else if (S_ISCHR(mode)) | |
1650 | av |= CHR_FILE__OPEN; | |
1651 | else if (S_ISBLK(mode)) | |
1652 | av |= BLK_FILE__OPEN; | |
1653 | else if (S_ISFIFO(mode)) | |
1654 | av |= FIFO_FILE__OPEN; | |
1655 | else if (S_ISDIR(mode)) | |
1656 | av |= DIR__OPEN; | |
1657 | else | |
744ba35e EP |
1658 | printk(KERN_ERR "SELinux: WARNING: inside %s with " |
1659 | "unknown mode:%x\n", __func__, mode); | |
b0c636b9 EP |
1660 | } |
1661 | return av; | |
1662 | } | |
1663 | ||
1da177e4 LT |
1664 | /* Convert a Linux file to an access vector. */ |
1665 | static inline u32 file_to_av(struct file *file) | |
1666 | { | |
1667 | u32 av = 0; | |
1668 | ||
1669 | if (file->f_mode & FMODE_READ) | |
1670 | av |= FILE__READ; | |
1671 | if (file->f_mode & FMODE_WRITE) { | |
1672 | if (file->f_flags & O_APPEND) | |
1673 | av |= FILE__APPEND; | |
1674 | else | |
1675 | av |= FILE__WRITE; | |
1676 | } | |
0794c66d SS |
1677 | if (!av) { |
1678 | /* | |
1679 | * Special file opened with flags 3 for ioctl-only use. | |
1680 | */ | |
1681 | av = FILE__IOCTL; | |
1682 | } | |
1da177e4 LT |
1683 | |
1684 | return av; | |
1685 | } | |
1686 | ||
1da177e4 LT |
1687 | /* Hook functions begin here. */ |
1688 | ||
006ebb40 SS |
1689 | static int selinux_ptrace(struct task_struct *parent, |
1690 | struct task_struct *child, | |
1691 | unsigned int mode) | |
1da177e4 | 1692 | { |
1da177e4 LT |
1693 | int rc; |
1694 | ||
006ebb40 | 1695 | rc = secondary_ops->ptrace(parent, child, mode); |
1da177e4 LT |
1696 | if (rc) |
1697 | return rc; | |
1698 | ||
006ebb40 SS |
1699 | if (mode == PTRACE_MODE_READ) { |
1700 | struct task_security_struct *tsec = parent->security; | |
1701 | struct task_security_struct *csec = child->security; | |
1702 | return avc_has_perm(tsec->sid, csec->sid, | |
1703 | SECCLASS_FILE, FILE__READ, NULL); | |
1704 | } | |
1705 | ||
0356357c | 1706 | return task_has_perm(parent, child, PROCESS__PTRACE); |
1da177e4 LT |
1707 | } |
1708 | ||
1709 | static int selinux_capget(struct task_struct *target, kernel_cap_t *effective, | |
828dfe1d | 1710 | kernel_cap_t *inheritable, kernel_cap_t *permitted) |
1da177e4 LT |
1711 | { |
1712 | int error; | |
1713 | ||
1714 | error = task_has_perm(current, target, PROCESS__GETCAP); | |
1715 | if (error) | |
1716 | return error; | |
1717 | ||
1718 | return secondary_ops->capget(target, effective, inheritable, permitted); | |
1719 | } | |
1720 | ||
1721 | static int selinux_capset_check(struct task_struct *target, kernel_cap_t *effective, | |
828dfe1d | 1722 | kernel_cap_t *inheritable, kernel_cap_t *permitted) |
1da177e4 LT |
1723 | { |
1724 | int error; | |
1725 | ||
1726 | error = secondary_ops->capset_check(target, effective, inheritable, permitted); | |
1727 | if (error) | |
1728 | return error; | |
1729 | ||
1730 | return task_has_perm(current, target, PROCESS__SETCAP); | |
1731 | } | |
1732 | ||
1733 | static void selinux_capset_set(struct task_struct *target, kernel_cap_t *effective, | |
828dfe1d | 1734 | kernel_cap_t *inheritable, kernel_cap_t *permitted) |
1da177e4 LT |
1735 | { |
1736 | secondary_ops->capset_set(target, effective, inheritable, permitted); | |
1737 | } | |
1738 | ||
1739 | static int selinux_capable(struct task_struct *tsk, int cap) | |
1740 | { | |
1741 | int rc; | |
1742 | ||
1743 | rc = secondary_ops->capable(tsk, cap); | |
1744 | if (rc) | |
1745 | return rc; | |
1746 | ||
828dfe1d | 1747 | return task_has_capability(tsk, cap); |
1da177e4 LT |
1748 | } |
1749 | ||
3fbfa981 EB |
1750 | static int selinux_sysctl_get_sid(ctl_table *table, u16 tclass, u32 *sid) |
1751 | { | |
1752 | int buflen, rc; | |
1753 | char *buffer, *path, *end; | |
1754 | ||
1755 | rc = -ENOMEM; | |
828dfe1d | 1756 | buffer = (char *)__get_free_page(GFP_KERNEL); |
3fbfa981 EB |
1757 | if (!buffer) |
1758 | goto out; | |
1759 | ||
1760 | buflen = PAGE_SIZE; | |
1761 | end = buffer+buflen; | |
1762 | *--end = '\0'; | |
1763 | buflen--; | |
1764 | path = end-1; | |
1765 | *path = '/'; | |
1766 | while (table) { | |
1767 | const char *name = table->procname; | |
1768 | size_t namelen = strlen(name); | |
1769 | buflen -= namelen + 1; | |
1770 | if (buflen < 0) | |
1771 | goto out_free; | |
1772 | end -= namelen; | |
1773 | memcpy(end, name, namelen); | |
1774 | *--end = '/'; | |
1775 | path = end; | |
1776 | table = table->parent; | |
1777 | } | |
b599fdfd EB |
1778 | buflen -= 4; |
1779 | if (buflen < 0) | |
1780 | goto out_free; | |
1781 | end -= 4; | |
1782 | memcpy(end, "/sys", 4); | |
1783 | path = end; | |
3fbfa981 EB |
1784 | rc = security_genfs_sid("proc", path, tclass, sid); |
1785 | out_free: | |
1786 | free_page((unsigned long)buffer); | |
1787 | out: | |
1788 | return rc; | |
1789 | } | |
1790 | ||
1da177e4 LT |
1791 | static int selinux_sysctl(ctl_table *table, int op) |
1792 | { | |
1793 | int error = 0; | |
1794 | u32 av; | |
1795 | struct task_security_struct *tsec; | |
1796 | u32 tsid; | |
1797 | int rc; | |
1798 | ||
1799 | rc = secondary_ops->sysctl(table, op); | |
1800 | if (rc) | |
1801 | return rc; | |
1802 | ||
1803 | tsec = current->security; | |
1804 | ||
3fbfa981 EB |
1805 | rc = selinux_sysctl_get_sid(table, (op == 0001) ? |
1806 | SECCLASS_DIR : SECCLASS_FILE, &tsid); | |
1da177e4 LT |
1807 | if (rc) { |
1808 | /* Default to the well-defined sysctl SID. */ | |
1809 | tsid = SECINITSID_SYSCTL; | |
1810 | } | |
1811 | ||
1812 | /* The op values are "defined" in sysctl.c, thereby creating | |
1813 | * a bad coupling between this module and sysctl.c */ | |
828dfe1d | 1814 | if (op == 001) { |
1da177e4 LT |
1815 | error = avc_has_perm(tsec->sid, tsid, |
1816 | SECCLASS_DIR, DIR__SEARCH, NULL); | |
1817 | } else { | |
1818 | av = 0; | |
1819 | if (op & 004) | |
1820 | av |= FILE__READ; | |
1821 | if (op & 002) | |
1822 | av |= FILE__WRITE; | |
1823 | if (av) | |
1824 | error = avc_has_perm(tsec->sid, tsid, | |
1825 | SECCLASS_FILE, av, NULL); | |
828dfe1d | 1826 | } |
1da177e4 LT |
1827 | |
1828 | return error; | |
1829 | } | |
1830 | ||
1831 | static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb) | |
1832 | { | |
1833 | int rc = 0; | |
1834 | ||
1835 | if (!sb) | |
1836 | return 0; | |
1837 | ||
1838 | switch (cmds) { | |
828dfe1d EP |
1839 | case Q_SYNC: |
1840 | case Q_QUOTAON: | |
1841 | case Q_QUOTAOFF: | |
1842 | case Q_SETINFO: | |
1843 | case Q_SETQUOTA: | |
1844 | rc = superblock_has_perm(current, sb, FILESYSTEM__QUOTAMOD, | |
1845 | NULL); | |
1846 | break; | |
1847 | case Q_GETFMT: | |
1848 | case Q_GETINFO: | |
1849 | case Q_GETQUOTA: | |
1850 | rc = superblock_has_perm(current, sb, FILESYSTEM__QUOTAGET, | |
1851 | NULL); | |
1852 | break; | |
1853 | default: | |
1854 | rc = 0; /* let the kernel handle invalid cmds */ | |
1855 | break; | |
1da177e4 LT |
1856 | } |
1857 | return rc; | |
1858 | } | |
1859 | ||
1860 | static int selinux_quota_on(struct dentry *dentry) | |
1861 | { | |
1862 | return dentry_has_perm(current, NULL, dentry, FILE__QUOTAON); | |
1863 | } | |
1864 | ||
1865 | static int selinux_syslog(int type) | |
1866 | { | |
1867 | int rc; | |
1868 | ||
1869 | rc = secondary_ops->syslog(type); | |
1870 | if (rc) | |
1871 | return rc; | |
1872 | ||
1873 | switch (type) { | |
828dfe1d EP |
1874 | case 3: /* Read last kernel messages */ |
1875 | case 10: /* Return size of the log buffer */ | |
1876 | rc = task_has_system(current, SYSTEM__SYSLOG_READ); | |
1877 | break; | |
1878 | case 6: /* Disable logging to console */ | |
1879 | case 7: /* Enable logging to console */ | |
1880 | case 8: /* Set level of messages printed to console */ | |
1881 | rc = task_has_system(current, SYSTEM__SYSLOG_CONSOLE); | |
1882 | break; | |
1883 | case 0: /* Close log */ | |
1884 | case 1: /* Open log */ | |
1885 | case 2: /* Read from log */ | |
1886 | case 4: /* Read/clear last kernel messages */ | |
1887 | case 5: /* Clear ring buffer */ | |
1888 | default: | |
1889 | rc = task_has_system(current, SYSTEM__SYSLOG_MOD); | |
1890 | break; | |
1da177e4 LT |
1891 | } |
1892 | return rc; | |
1893 | } | |
1894 | ||
1895 | /* | |
1896 | * Check that a process has enough memory to allocate a new virtual | |
1897 | * mapping. 0 means there is enough memory for the allocation to | |
1898 | * succeed and -ENOMEM implies there is not. | |
1899 | * | |
1900 | * Note that secondary_ops->capable and task_has_perm_noaudit return 0 | |
1901 | * if the capability is granted, but __vm_enough_memory requires 1 if | |
1902 | * the capability is granted. | |
1903 | * | |
1904 | * Do not audit the selinux permission check, as this is applied to all | |
1905 | * processes that allocate mappings. | |
1906 | */ | |
34b4e4aa | 1907 | static int selinux_vm_enough_memory(struct mm_struct *mm, long pages) |
1da177e4 LT |
1908 | { |
1909 | int rc, cap_sys_admin = 0; | |
1910 | struct task_security_struct *tsec = current->security; | |
1911 | ||
1912 | rc = secondary_ops->capable(current, CAP_SYS_ADMIN); | |
1913 | if (rc == 0) | |
1914 | rc = avc_has_perm_noaudit(tsec->sid, tsec->sid, | |
2c3c05db SS |
1915 | SECCLASS_CAPABILITY, |
1916 | CAP_TO_MASK(CAP_SYS_ADMIN), | |
1917 | 0, | |
1918 | NULL); | |
1da177e4 LT |
1919 | |
1920 | if (rc == 0) | |
1921 | cap_sys_admin = 1; | |
1922 | ||
34b4e4aa | 1923 | return __vm_enough_memory(mm, pages, cap_sys_admin); |
1da177e4 LT |
1924 | } |
1925 | ||
0356357c RM |
1926 | /** |
1927 | * task_tracer_task - return the task that is tracing the given task | |
1928 | * @task: task to consider | |
1929 | * | |
1930 | * Returns NULL if noone is tracing @task, or the &struct task_struct | |
1931 | * pointer to its tracer. | |
1932 | * | |
1933 | * Must be called under rcu_read_lock(). | |
1934 | */ | |
1935 | static struct task_struct *task_tracer_task(struct task_struct *task) | |
1936 | { | |
1937 | if (task->ptrace & PT_PTRACED) | |
1938 | return rcu_dereference(task->parent); | |
1939 | return NULL; | |
1940 | } | |
1941 | ||
1da177e4 LT |
1942 | /* binprm security operations */ |
1943 | ||
1944 | static int selinux_bprm_alloc_security(struct linux_binprm *bprm) | |
1945 | { | |
1946 | struct bprm_security_struct *bsec; | |
1947 | ||
89d155ef | 1948 | bsec = kzalloc(sizeof(struct bprm_security_struct), GFP_KERNEL); |
1da177e4 LT |
1949 | if (!bsec) |
1950 | return -ENOMEM; | |
1951 | ||
1da177e4 LT |
1952 | bsec->sid = SECINITSID_UNLABELED; |
1953 | bsec->set = 0; | |
1954 | ||
1955 | bprm->security = bsec; | |
1956 | return 0; | |
1957 | } | |
1958 | ||
1959 | static int selinux_bprm_set_security(struct linux_binprm *bprm) | |
1960 | { | |
1961 | struct task_security_struct *tsec; | |
3d5ff529 | 1962 | struct inode *inode = bprm->file->f_path.dentry->d_inode; |
1da177e4 LT |
1963 | struct inode_security_struct *isec; |
1964 | struct bprm_security_struct *bsec; | |
1965 | u32 newsid; | |
1966 | struct avc_audit_data ad; | |
1967 | int rc; | |
1968 | ||
1969 | rc = secondary_ops->bprm_set_security(bprm); | |
1970 | if (rc) | |
1971 | return rc; | |
1972 | ||
1973 | bsec = bprm->security; | |
1974 | ||
1975 | if (bsec->set) | |
1976 | return 0; | |
1977 | ||
1978 | tsec = current->security; | |
1979 | isec = inode->i_security; | |
1980 | ||
1981 | /* Default to the current task SID. */ | |
1982 | bsec->sid = tsec->sid; | |
1983 | ||
28eba5bf | 1984 | /* Reset fs, key, and sock SIDs on execve. */ |
1da177e4 | 1985 | tsec->create_sid = 0; |
28eba5bf | 1986 | tsec->keycreate_sid = 0; |
42c3e03e | 1987 | tsec->sockcreate_sid = 0; |
1da177e4 LT |
1988 | |
1989 | if (tsec->exec_sid) { | |
1990 | newsid = tsec->exec_sid; | |
1991 | /* Reset exec SID on execve. */ | |
1992 | tsec->exec_sid = 0; | |
1993 | } else { | |
1994 | /* Check for a default transition on this program. */ | |
1995 | rc = security_transition_sid(tsec->sid, isec->sid, | |
828dfe1d | 1996 | SECCLASS_PROCESS, &newsid); |
1da177e4 LT |
1997 | if (rc) |
1998 | return rc; | |
1999 | } | |
2000 | ||
2001 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
44707fdf | 2002 | ad.u.fs.path = bprm->file->f_path; |
1da177e4 | 2003 | |
3d5ff529 | 2004 | if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID) |
1da177e4 LT |
2005 | newsid = tsec->sid; |
2006 | ||
828dfe1d | 2007 | if (tsec->sid == newsid) { |
1da177e4 LT |
2008 | rc = avc_has_perm(tsec->sid, isec->sid, |
2009 | SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad); | |
2010 | if (rc) | |
2011 | return rc; | |
2012 | } else { | |
2013 | /* Check permissions for the transition. */ | |
2014 | rc = avc_has_perm(tsec->sid, newsid, | |
2015 | SECCLASS_PROCESS, PROCESS__TRANSITION, &ad); | |
2016 | if (rc) | |
2017 | return rc; | |
2018 | ||
2019 | rc = avc_has_perm(newsid, isec->sid, | |
2020 | SECCLASS_FILE, FILE__ENTRYPOINT, &ad); | |
2021 | if (rc) | |
2022 | return rc; | |
2023 | ||
2024 | /* Clear any possibly unsafe personality bits on exec: */ | |
2025 | current->personality &= ~PER_CLEAR_ON_SETID; | |
2026 | ||
2027 | /* Set the security field to the new SID. */ | |
2028 | bsec->sid = newsid; | |
2029 | } | |
2030 | ||
2031 | bsec->set = 1; | |
2032 | return 0; | |
2033 | } | |
2034 | ||
828dfe1d | 2035 | static int selinux_bprm_check_security(struct linux_binprm *bprm) |
1da177e4 LT |
2036 | { |
2037 | return secondary_ops->bprm_check_security(bprm); | |
2038 | } | |
2039 | ||
2040 | ||
828dfe1d | 2041 | static int selinux_bprm_secureexec(struct linux_binprm *bprm) |
1da177e4 LT |
2042 | { |
2043 | struct task_security_struct *tsec = current->security; | |
2044 | int atsecure = 0; | |
2045 | ||
2046 | if (tsec->osid != tsec->sid) { | |
2047 | /* Enable secure mode for SIDs transitions unless | |
2048 | the noatsecure permission is granted between | |
2049 | the two SIDs, i.e. ahp returns 0. */ | |
2050 | atsecure = avc_has_perm(tsec->osid, tsec->sid, | |
2051 | SECCLASS_PROCESS, | |
2052 | PROCESS__NOATSECURE, NULL); | |
2053 | } | |
2054 | ||
2055 | return (atsecure || secondary_ops->bprm_secureexec(bprm)); | |
2056 | } | |
2057 | ||
2058 | static void selinux_bprm_free_security(struct linux_binprm *bprm) | |
2059 | { | |
9a5f04bf | 2060 | kfree(bprm->security); |
1da177e4 | 2061 | bprm->security = NULL; |
1da177e4 LT |
2062 | } |
2063 | ||
2064 | extern struct vfsmount *selinuxfs_mount; | |
2065 | extern struct dentry *selinux_null; | |
2066 | ||
2067 | /* Derived from fs/exec.c:flush_old_files. */ | |
828dfe1d | 2068 | static inline void flush_unauthorized_files(struct files_struct *files) |
1da177e4 LT |
2069 | { |
2070 | struct avc_audit_data ad; | |
2071 | struct file *file, *devnull = NULL; | |
b20c8122 | 2072 | struct tty_struct *tty; |
badf1662 | 2073 | struct fdtable *fdt; |
1da177e4 | 2074 | long j = -1; |
24ec839c | 2075 | int drop_tty = 0; |
1da177e4 | 2076 | |
b20c8122 | 2077 | mutex_lock(&tty_mutex); |
24ec839c | 2078 | tty = get_current_tty(); |
1da177e4 LT |
2079 | if (tty) { |
2080 | file_list_lock(); | |
2f512016 | 2081 | file = list_entry(tty->tty_files.next, typeof(*file), f_u.fu_list); |
1da177e4 LT |
2082 | if (file) { |
2083 | /* Revalidate access to controlling tty. | |
2084 | Use inode_has_perm on the tty inode directly rather | |
2085 | than using file_has_perm, as this particular open | |
2086 | file may belong to another process and we are only | |
2087 | interested in the inode-based check here. */ | |
3d5ff529 | 2088 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
2089 | if (inode_has_perm(current, inode, |
2090 | FILE__READ | FILE__WRITE, NULL)) { | |
24ec839c | 2091 | drop_tty = 1; |
1da177e4 LT |
2092 | } |
2093 | } | |
2094 | file_list_unlock(); | |
2095 | } | |
b20c8122 | 2096 | mutex_unlock(&tty_mutex); |
98a27ba4 EB |
2097 | /* Reset controlling tty. */ |
2098 | if (drop_tty) | |
2099 | no_tty(); | |
1da177e4 LT |
2100 | |
2101 | /* Revalidate access to inherited open files. */ | |
2102 | ||
828dfe1d | 2103 | AVC_AUDIT_DATA_INIT(&ad, FS); |
1da177e4 LT |
2104 | |
2105 | spin_lock(&files->file_lock); | |
2106 | for (;;) { | |
2107 | unsigned long set, i; | |
2108 | int fd; | |
2109 | ||
2110 | j++; | |
2111 | i = j * __NFDBITS; | |
badf1662 | 2112 | fdt = files_fdtable(files); |
bbea9f69 | 2113 | if (i >= fdt->max_fds) |
1da177e4 | 2114 | break; |
badf1662 | 2115 | set = fdt->open_fds->fds_bits[j]; |
1da177e4 LT |
2116 | if (!set) |
2117 | continue; | |
2118 | spin_unlock(&files->file_lock); | |
828dfe1d | 2119 | for ( ; set ; i++, set >>= 1) { |
1da177e4 LT |
2120 | if (set & 1) { |
2121 | file = fget(i); | |
2122 | if (!file) | |
2123 | continue; | |
2124 | if (file_has_perm(current, | |
2125 | file, | |
2126 | file_to_av(file))) { | |
2127 | sys_close(i); | |
2128 | fd = get_unused_fd(); | |
2129 | if (fd != i) { | |
2130 | if (fd >= 0) | |
2131 | put_unused_fd(fd); | |
2132 | fput(file); | |
2133 | continue; | |
2134 | } | |
2135 | if (devnull) { | |
095975da | 2136 | get_file(devnull); |
1da177e4 LT |
2137 | } else { |
2138 | devnull = dentry_open(dget(selinux_null), mntget(selinuxfs_mount), O_RDWR); | |
fc5d81e6 AM |
2139 | if (IS_ERR(devnull)) { |
2140 | devnull = NULL; | |
1da177e4 LT |
2141 | put_unused_fd(fd); |
2142 | fput(file); | |
2143 | continue; | |
2144 | } | |
2145 | } | |
2146 | fd_install(fd, devnull); | |
2147 | } | |
2148 | fput(file); | |
2149 | } | |
2150 | } | |
2151 | spin_lock(&files->file_lock); | |
2152 | ||
2153 | } | |
2154 | spin_unlock(&files->file_lock); | |
2155 | } | |
2156 | ||
2157 | static void selinux_bprm_apply_creds(struct linux_binprm *bprm, int unsafe) | |
2158 | { | |
2159 | struct task_security_struct *tsec; | |
2160 | struct bprm_security_struct *bsec; | |
2161 | u32 sid; | |
2162 | int rc; | |
2163 | ||
2164 | secondary_ops->bprm_apply_creds(bprm, unsafe); | |
2165 | ||
2166 | tsec = current->security; | |
2167 | ||
2168 | bsec = bprm->security; | |
2169 | sid = bsec->sid; | |
2170 | ||
2171 | tsec->osid = tsec->sid; | |
2172 | bsec->unsafe = 0; | |
2173 | if (tsec->sid != sid) { | |
2174 | /* Check for shared state. If not ok, leave SID | |
2175 | unchanged and kill. */ | |
2176 | if (unsafe & LSM_UNSAFE_SHARE) { | |
2177 | rc = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS, | |
2178 | PROCESS__SHARE, NULL); | |
2179 | if (rc) { | |
2180 | bsec->unsafe = 1; | |
2181 | return; | |
2182 | } | |
2183 | } | |
2184 | ||
2185 | /* Check for ptracing, and update the task SID if ok. | |
2186 | Otherwise, leave SID unchanged and kill. */ | |
2187 | if (unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) { | |
0356357c RM |
2188 | struct task_struct *tracer; |
2189 | struct task_security_struct *sec; | |
2190 | u32 ptsid = 0; | |
2191 | ||
2192 | rcu_read_lock(); | |
2193 | tracer = task_tracer_task(current); | |
2194 | if (likely(tracer != NULL)) { | |
2195 | sec = tracer->security; | |
2196 | ptsid = sec->sid; | |
2197 | } | |
2198 | rcu_read_unlock(); | |
2199 | ||
2200 | if (ptsid != 0) { | |
2201 | rc = avc_has_perm(ptsid, sid, SECCLASS_PROCESS, | |
2202 | PROCESS__PTRACE, NULL); | |
2203 | if (rc) { | |
2204 | bsec->unsafe = 1; | |
2205 | return; | |
2206 | } | |
1da177e4 LT |
2207 | } |
2208 | } | |
2209 | tsec->sid = sid; | |
2210 | } | |
2211 | } | |
2212 | ||
2213 | /* | |
2214 | * called after apply_creds without the task lock held | |
2215 | */ | |
2216 | static void selinux_bprm_post_apply_creds(struct linux_binprm *bprm) | |
2217 | { | |
2218 | struct task_security_struct *tsec; | |
2219 | struct rlimit *rlim, *initrlim; | |
2220 | struct itimerval itimer; | |
2221 | struct bprm_security_struct *bsec; | |
2222 | int rc, i; | |
2223 | ||
2224 | tsec = current->security; | |
2225 | bsec = bprm->security; | |
2226 | ||
2227 | if (bsec->unsafe) { | |
2228 | force_sig_specific(SIGKILL, current); | |
2229 | return; | |
2230 | } | |
2231 | if (tsec->osid == tsec->sid) | |
2232 | return; | |
2233 | ||
2234 | /* Close files for which the new task SID is not authorized. */ | |
2235 | flush_unauthorized_files(current->files); | |
2236 | ||
2237 | /* Check whether the new SID can inherit signal state | |
2238 | from the old SID. If not, clear itimers to avoid | |
2239 | subsequent signal generation and flush and unblock | |
2240 | signals. This must occur _after_ the task SID has | |
2241 | been updated so that any kill done after the flush | |
2242 | will be checked against the new SID. */ | |
2243 | rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS, | |
2244 | PROCESS__SIGINH, NULL); | |
2245 | if (rc) { | |
2246 | memset(&itimer, 0, sizeof itimer); | |
2247 | for (i = 0; i < 3; i++) | |
2248 | do_setitimer(i, &itimer, NULL); | |
2249 | flush_signals(current); | |
2250 | spin_lock_irq(¤t->sighand->siglock); | |
2251 | flush_signal_handlers(current, 1); | |
2252 | sigemptyset(¤t->blocked); | |
2253 | recalc_sigpending(); | |
2254 | spin_unlock_irq(¤t->sighand->siglock); | |
2255 | } | |
2256 | ||
4ac212ad SS |
2257 | /* Always clear parent death signal on SID transitions. */ |
2258 | current->pdeath_signal = 0; | |
2259 | ||
1da177e4 LT |
2260 | /* Check whether the new SID can inherit resource limits |
2261 | from the old SID. If not, reset all soft limits to | |
2262 | the lower of the current task's hard limit and the init | |
2263 | task's soft limit. Note that the setting of hard limits | |
2264 | (even to lower them) can be controlled by the setrlimit | |
2265 | check. The inclusion of the init task's soft limit into | |
2266 | the computation is to avoid resetting soft limits higher | |
2267 | than the default soft limit for cases where the default | |
2268 | is lower than the hard limit, e.g. RLIMIT_CORE or | |
2269 | RLIMIT_STACK.*/ | |
2270 | rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS, | |
2271 | PROCESS__RLIMITINH, NULL); | |
2272 | if (rc) { | |
2273 | for (i = 0; i < RLIM_NLIMITS; i++) { | |
2274 | rlim = current->signal->rlim + i; | |
2275 | initrlim = init_task.signal->rlim+i; | |
828dfe1d | 2276 | rlim->rlim_cur = min(rlim->rlim_max, initrlim->rlim_cur); |
1da177e4 LT |
2277 | } |
2278 | if (current->signal->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY) { | |
2279 | /* | |
2280 | * This will cause RLIMIT_CPU calculations | |
2281 | * to be refigured. | |
2282 | */ | |
2283 | current->it_prof_expires = jiffies_to_cputime(1); | |
2284 | } | |
2285 | } | |
2286 | ||
2287 | /* Wake up the parent if it is waiting so that it can | |
2288 | recheck wait permission to the new task SID. */ | |
2289 | wake_up_interruptible(¤t->parent->signal->wait_chldexit); | |
2290 | } | |
2291 | ||
2292 | /* superblock security operations */ | |
2293 | ||
2294 | static int selinux_sb_alloc_security(struct super_block *sb) | |
2295 | { | |
2296 | return superblock_alloc_security(sb); | |
2297 | } | |
2298 | ||
2299 | static void selinux_sb_free_security(struct super_block *sb) | |
2300 | { | |
2301 | superblock_free_security(sb); | |
2302 | } | |
2303 | ||
2304 | static inline int match_prefix(char *prefix, int plen, char *option, int olen) | |
2305 | { | |
2306 | if (plen > olen) | |
2307 | return 0; | |
2308 | ||
2309 | return !memcmp(prefix, option, plen); | |
2310 | } | |
2311 | ||
2312 | static inline int selinux_option(char *option, int len) | |
2313 | { | |
832cbd9a EP |
2314 | return (match_prefix(CONTEXT_STR, sizeof(CONTEXT_STR)-1, option, len) || |
2315 | match_prefix(FSCONTEXT_STR, sizeof(FSCONTEXT_STR)-1, option, len) || | |
2316 | match_prefix(DEFCONTEXT_STR, sizeof(DEFCONTEXT_STR)-1, option, len) || | |
2317 | match_prefix(ROOTCONTEXT_STR, sizeof(ROOTCONTEXT_STR)-1, option, len)); | |
1da177e4 LT |
2318 | } |
2319 | ||
2320 | static inline void take_option(char **to, char *from, int *first, int len) | |
2321 | { | |
2322 | if (!*first) { | |
2323 | **to = ','; | |
2324 | *to += 1; | |
3528a953 | 2325 | } else |
1da177e4 LT |
2326 | *first = 0; |
2327 | memcpy(*to, from, len); | |
2328 | *to += len; | |
2329 | } | |
2330 | ||
828dfe1d EP |
2331 | static inline void take_selinux_option(char **to, char *from, int *first, |
2332 | int len) | |
3528a953 CO |
2333 | { |
2334 | int current_size = 0; | |
2335 | ||
2336 | if (!*first) { | |
2337 | **to = '|'; | |
2338 | *to += 1; | |
828dfe1d | 2339 | } else |
3528a953 CO |
2340 | *first = 0; |
2341 | ||
2342 | while (current_size < len) { | |
2343 | if (*from != '"') { | |
2344 | **to = *from; | |
2345 | *to += 1; | |
2346 | } | |
2347 | from += 1; | |
2348 | current_size += 1; | |
2349 | } | |
2350 | } | |
2351 | ||
e0007529 | 2352 | static int selinux_sb_copy_data(char *orig, char *copy) |
1da177e4 LT |
2353 | { |
2354 | int fnosec, fsec, rc = 0; | |
2355 | char *in_save, *in_curr, *in_end; | |
2356 | char *sec_curr, *nosec_save, *nosec; | |
3528a953 | 2357 | int open_quote = 0; |
1da177e4 LT |
2358 | |
2359 | in_curr = orig; | |
2360 | sec_curr = copy; | |
2361 | ||
1da177e4 LT |
2362 | nosec = (char *)get_zeroed_page(GFP_KERNEL); |
2363 | if (!nosec) { | |
2364 | rc = -ENOMEM; | |
2365 | goto out; | |
2366 | } | |
2367 | ||
2368 | nosec_save = nosec; | |
2369 | fnosec = fsec = 1; | |
2370 | in_save = in_end = orig; | |
2371 | ||
2372 | do { | |
3528a953 CO |
2373 | if (*in_end == '"') |
2374 | open_quote = !open_quote; | |
2375 | if ((*in_end == ',' && open_quote == 0) || | |
2376 | *in_end == '\0') { | |
1da177e4 LT |
2377 | int len = in_end - in_curr; |
2378 | ||
2379 | if (selinux_option(in_curr, len)) | |
3528a953 | 2380 | take_selinux_option(&sec_curr, in_curr, &fsec, len); |
1da177e4 LT |
2381 | else |
2382 | take_option(&nosec, in_curr, &fnosec, len); | |
2383 | ||
2384 | in_curr = in_end + 1; | |
2385 | } | |
2386 | } while (*in_end++); | |
2387 | ||
6931dfc9 | 2388 | strcpy(in_save, nosec_save); |
da3caa20 | 2389 | free_page((unsigned long)nosec_save); |
1da177e4 LT |
2390 | out: |
2391 | return rc; | |
2392 | } | |
2393 | ||
2394 | static int selinux_sb_kern_mount(struct super_block *sb, void *data) | |
2395 | { | |
2396 | struct avc_audit_data ad; | |
2397 | int rc; | |
2398 | ||
2399 | rc = superblock_doinit(sb, data); | |
2400 | if (rc) | |
2401 | return rc; | |
2402 | ||
828dfe1d | 2403 | AVC_AUDIT_DATA_INIT(&ad, FS); |
44707fdf | 2404 | ad.u.fs.path.dentry = sb->s_root; |
1da177e4 LT |
2405 | return superblock_has_perm(current, sb, FILESYSTEM__MOUNT, &ad); |
2406 | } | |
2407 | ||
726c3342 | 2408 | static int selinux_sb_statfs(struct dentry *dentry) |
1da177e4 LT |
2409 | { |
2410 | struct avc_audit_data ad; | |
2411 | ||
828dfe1d | 2412 | AVC_AUDIT_DATA_INIT(&ad, FS); |
44707fdf | 2413 | ad.u.fs.path.dentry = dentry->d_sb->s_root; |
726c3342 | 2414 | return superblock_has_perm(current, dentry->d_sb, FILESYSTEM__GETATTR, &ad); |
1da177e4 LT |
2415 | } |
2416 | ||
828dfe1d | 2417 | static int selinux_mount(char *dev_name, |
b5266eb4 | 2418 | struct path *path, |
828dfe1d EP |
2419 | char *type, |
2420 | unsigned long flags, | |
2421 | void *data) | |
1da177e4 LT |
2422 | { |
2423 | int rc; | |
2424 | ||
b5266eb4 | 2425 | rc = secondary_ops->sb_mount(dev_name, path, type, flags, data); |
1da177e4 LT |
2426 | if (rc) |
2427 | return rc; | |
2428 | ||
2429 | if (flags & MS_REMOUNT) | |
b5266eb4 | 2430 | return superblock_has_perm(current, path->mnt->mnt_sb, |
828dfe1d | 2431 | FILESYSTEM__REMOUNT, NULL); |
1da177e4 | 2432 | else |
b5266eb4 | 2433 | return dentry_has_perm(current, path->mnt, path->dentry, |
828dfe1d | 2434 | FILE__MOUNTON); |
1da177e4 LT |
2435 | } |
2436 | ||
2437 | static int selinux_umount(struct vfsmount *mnt, int flags) | |
2438 | { | |
2439 | int rc; | |
2440 | ||
2441 | rc = secondary_ops->sb_umount(mnt, flags); | |
2442 | if (rc) | |
2443 | return rc; | |
2444 | ||
828dfe1d EP |
2445 | return superblock_has_perm(current, mnt->mnt_sb, |
2446 | FILESYSTEM__UNMOUNT, NULL); | |
1da177e4 LT |
2447 | } |
2448 | ||
2449 | /* inode security operations */ | |
2450 | ||
2451 | static int selinux_inode_alloc_security(struct inode *inode) | |
2452 | { | |
2453 | return inode_alloc_security(inode); | |
2454 | } | |
2455 | ||
2456 | static void selinux_inode_free_security(struct inode *inode) | |
2457 | { | |
2458 | inode_free_security(inode); | |
2459 | } | |
2460 | ||
5e41ff9e SS |
2461 | static int selinux_inode_init_security(struct inode *inode, struct inode *dir, |
2462 | char **name, void **value, | |
2463 | size_t *len) | |
2464 | { | |
2465 | struct task_security_struct *tsec; | |
2466 | struct inode_security_struct *dsec; | |
2467 | struct superblock_security_struct *sbsec; | |
570bc1c2 | 2468 | u32 newsid, clen; |
5e41ff9e | 2469 | int rc; |
570bc1c2 | 2470 | char *namep = NULL, *context; |
5e41ff9e SS |
2471 | |
2472 | tsec = current->security; | |
2473 | dsec = dir->i_security; | |
2474 | sbsec = dir->i_sb->s_security; | |
5e41ff9e SS |
2475 | |
2476 | if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) { | |
2477 | newsid = tsec->create_sid; | |
2478 | } else { | |
2479 | rc = security_transition_sid(tsec->sid, dsec->sid, | |
2480 | inode_mode_to_security_class(inode->i_mode), | |
2481 | &newsid); | |
2482 | if (rc) { | |
2483 | printk(KERN_WARNING "%s: " | |
2484 | "security_transition_sid failed, rc=%d (dev=%s " | |
2485 | "ino=%ld)\n", | |
dd6f953a | 2486 | __func__, |
5e41ff9e SS |
2487 | -rc, inode->i_sb->s_id, inode->i_ino); |
2488 | return rc; | |
2489 | } | |
2490 | } | |
2491 | ||
296fddf7 EP |
2492 | /* Possibly defer initialization to selinux_complete_init. */ |
2493 | if (sbsec->initialized) { | |
2494 | struct inode_security_struct *isec = inode->i_security; | |
2495 | isec->sclass = inode_mode_to_security_class(inode->i_mode); | |
2496 | isec->sid = newsid; | |
2497 | isec->initialized = 1; | |
2498 | } | |
5e41ff9e | 2499 | |
8aad3875 | 2500 | if (!ss_initialized || sbsec->behavior == SECURITY_FS_USE_MNTPOINT) |
25a74f3b SS |
2501 | return -EOPNOTSUPP; |
2502 | ||
570bc1c2 | 2503 | if (name) { |
a02fe132 | 2504 | namep = kstrdup(XATTR_SELINUX_SUFFIX, GFP_NOFS); |
570bc1c2 SS |
2505 | if (!namep) |
2506 | return -ENOMEM; | |
2507 | *name = namep; | |
2508 | } | |
5e41ff9e | 2509 | |
570bc1c2 | 2510 | if (value && len) { |
12b29f34 | 2511 | rc = security_sid_to_context_force(newsid, &context, &clen); |
570bc1c2 SS |
2512 | if (rc) { |
2513 | kfree(namep); | |
2514 | return rc; | |
2515 | } | |
2516 | *value = context; | |
2517 | *len = clen; | |
5e41ff9e | 2518 | } |
5e41ff9e | 2519 | |
5e41ff9e SS |
2520 | return 0; |
2521 | } | |
2522 | ||
1da177e4 LT |
2523 | static int selinux_inode_create(struct inode *dir, struct dentry *dentry, int mask) |
2524 | { | |
2525 | return may_create(dir, dentry, SECCLASS_FILE); | |
2526 | } | |
2527 | ||
1da177e4 LT |
2528 | static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry) |
2529 | { | |
2530 | int rc; | |
2531 | ||
828dfe1d | 2532 | rc = secondary_ops->inode_link(old_dentry, dir, new_dentry); |
1da177e4 LT |
2533 | if (rc) |
2534 | return rc; | |
2535 | return may_link(dir, old_dentry, MAY_LINK); | |
2536 | } | |
2537 | ||
1da177e4 LT |
2538 | static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry) |
2539 | { | |
2540 | int rc; | |
2541 | ||
2542 | rc = secondary_ops->inode_unlink(dir, dentry); | |
2543 | if (rc) | |
2544 | return rc; | |
2545 | return may_link(dir, dentry, MAY_UNLINK); | |
2546 | } | |
2547 | ||
2548 | static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const char *name) | |
2549 | { | |
2550 | return may_create(dir, dentry, SECCLASS_LNK_FILE); | |
2551 | } | |
2552 | ||
1da177e4 LT |
2553 | static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, int mask) |
2554 | { | |
2555 | return may_create(dir, dentry, SECCLASS_DIR); | |
2556 | } | |
2557 | ||
1da177e4 LT |
2558 | static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry) |
2559 | { | |
2560 | return may_link(dir, dentry, MAY_RMDIR); | |
2561 | } | |
2562 | ||
2563 | static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) | |
2564 | { | |
2565 | int rc; | |
2566 | ||
2567 | rc = secondary_ops->inode_mknod(dir, dentry, mode, dev); | |
2568 | if (rc) | |
2569 | return rc; | |
2570 | ||
2571 | return may_create(dir, dentry, inode_mode_to_security_class(mode)); | |
2572 | } | |
2573 | ||
1da177e4 | 2574 | static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry, |
828dfe1d | 2575 | struct inode *new_inode, struct dentry *new_dentry) |
1da177e4 LT |
2576 | { |
2577 | return may_rename(old_inode, old_dentry, new_inode, new_dentry); | |
2578 | } | |
2579 | ||
1da177e4 LT |
2580 | static int selinux_inode_readlink(struct dentry *dentry) |
2581 | { | |
2582 | return dentry_has_perm(current, NULL, dentry, FILE__READ); | |
2583 | } | |
2584 | ||
2585 | static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *nameidata) | |
2586 | { | |
2587 | int rc; | |
2588 | ||
828dfe1d | 2589 | rc = secondary_ops->inode_follow_link(dentry, nameidata); |
1da177e4 LT |
2590 | if (rc) |
2591 | return rc; | |
2592 | return dentry_has_perm(current, NULL, dentry, FILE__READ); | |
2593 | } | |
2594 | ||
2595 | static int selinux_inode_permission(struct inode *inode, int mask, | |
2596 | struct nameidata *nd) | |
2597 | { | |
2598 | int rc; | |
2599 | ||
2600 | rc = secondary_ops->inode_permission(inode, mask, nd); | |
2601 | if (rc) | |
2602 | return rc; | |
2603 | ||
2604 | if (!mask) { | |
2605 | /* No permission to check. Existence test. */ | |
2606 | return 0; | |
2607 | } | |
2608 | ||
2609 | return inode_has_perm(current, inode, | |
b0c636b9 | 2610 | open_file_mask_to_av(inode->i_mode, mask), NULL); |
1da177e4 LT |
2611 | } |
2612 | ||
2613 | static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
2614 | { | |
2615 | int rc; | |
2616 | ||
2617 | rc = secondary_ops->inode_setattr(dentry, iattr); | |
2618 | if (rc) | |
2619 | return rc; | |
2620 | ||
2621 | if (iattr->ia_valid & ATTR_FORCE) | |
2622 | return 0; | |
2623 | ||
2624 | if (iattr->ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | | |
2625 | ATTR_ATIME_SET | ATTR_MTIME_SET)) | |
2626 | return dentry_has_perm(current, NULL, dentry, FILE__SETATTR); | |
2627 | ||
2628 | return dentry_has_perm(current, NULL, dentry, FILE__WRITE); | |
2629 | } | |
2630 | ||
2631 | static int selinux_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
2632 | { | |
2633 | return dentry_has_perm(current, mnt, dentry, FILE__GETATTR); | |
2634 | } | |
2635 | ||
8f0cfa52 | 2636 | static int selinux_inode_setotherxattr(struct dentry *dentry, const char *name) |
b5376771 SH |
2637 | { |
2638 | if (!strncmp(name, XATTR_SECURITY_PREFIX, | |
2639 | sizeof XATTR_SECURITY_PREFIX - 1)) { | |
2640 | if (!strcmp(name, XATTR_NAME_CAPS)) { | |
2641 | if (!capable(CAP_SETFCAP)) | |
2642 | return -EPERM; | |
2643 | } else if (!capable(CAP_SYS_ADMIN)) { | |
2644 | /* A different attribute in the security namespace. | |
2645 | Restrict to administrator. */ | |
2646 | return -EPERM; | |
2647 | } | |
2648 | } | |
2649 | ||
2650 | /* Not an attribute we recognize, so just check the | |
2651 | ordinary setattr permission. */ | |
2652 | return dentry_has_perm(current, NULL, dentry, FILE__SETATTR); | |
2653 | } | |
2654 | ||
8f0cfa52 DH |
2655 | static int selinux_inode_setxattr(struct dentry *dentry, const char *name, |
2656 | const void *value, size_t size, int flags) | |
1da177e4 LT |
2657 | { |
2658 | struct task_security_struct *tsec = current->security; | |
2659 | struct inode *inode = dentry->d_inode; | |
2660 | struct inode_security_struct *isec = inode->i_security; | |
2661 | struct superblock_security_struct *sbsec; | |
2662 | struct avc_audit_data ad; | |
2663 | u32 newsid; | |
2664 | int rc = 0; | |
2665 | ||
b5376771 SH |
2666 | if (strcmp(name, XATTR_NAME_SELINUX)) |
2667 | return selinux_inode_setotherxattr(dentry, name); | |
1da177e4 LT |
2668 | |
2669 | sbsec = inode->i_sb->s_security; | |
2670 | if (sbsec->behavior == SECURITY_FS_USE_MNTPOINT) | |
2671 | return -EOPNOTSUPP; | |
2672 | ||
3bd858ab | 2673 | if (!is_owner_or_cap(inode)) |
1da177e4 LT |
2674 | return -EPERM; |
2675 | ||
828dfe1d | 2676 | AVC_AUDIT_DATA_INIT(&ad, FS); |
44707fdf | 2677 | ad.u.fs.path.dentry = dentry; |
1da177e4 LT |
2678 | |
2679 | rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass, | |
2680 | FILE__RELABELFROM, &ad); | |
2681 | if (rc) | |
2682 | return rc; | |
2683 | ||
2684 | rc = security_context_to_sid(value, size, &newsid); | |
12b29f34 SS |
2685 | if (rc == -EINVAL) { |
2686 | if (!capable(CAP_MAC_ADMIN)) | |
2687 | return rc; | |
2688 | rc = security_context_to_sid_force(value, size, &newsid); | |
2689 | } | |
1da177e4 LT |
2690 | if (rc) |
2691 | return rc; | |
2692 | ||
2693 | rc = avc_has_perm(tsec->sid, newsid, isec->sclass, | |
2694 | FILE__RELABELTO, &ad); | |
2695 | if (rc) | |
2696 | return rc; | |
2697 | ||
2698 | rc = security_validate_transition(isec->sid, newsid, tsec->sid, | |
828dfe1d | 2699 | isec->sclass); |
1da177e4 LT |
2700 | if (rc) |
2701 | return rc; | |
2702 | ||
2703 | return avc_has_perm(newsid, | |
2704 | sbsec->sid, | |
2705 | SECCLASS_FILESYSTEM, | |
2706 | FILESYSTEM__ASSOCIATE, | |
2707 | &ad); | |
2708 | } | |
2709 | ||
8f0cfa52 | 2710 | static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name, |
f5269710 | 2711 | const void *value, size_t size, |
8f0cfa52 | 2712 | int flags) |
1da177e4 LT |
2713 | { |
2714 | struct inode *inode = dentry->d_inode; | |
2715 | struct inode_security_struct *isec = inode->i_security; | |
2716 | u32 newsid; | |
2717 | int rc; | |
2718 | ||
2719 | if (strcmp(name, XATTR_NAME_SELINUX)) { | |
2720 | /* Not an attribute we recognize, so nothing to do. */ | |
2721 | return; | |
2722 | } | |
2723 | ||
12b29f34 | 2724 | rc = security_context_to_sid_force(value, size, &newsid); |
1da177e4 | 2725 | if (rc) { |
12b29f34 SS |
2726 | printk(KERN_ERR "SELinux: unable to map context to SID" |
2727 | "for (%s, %lu), rc=%d\n", | |
2728 | inode->i_sb->s_id, inode->i_ino, -rc); | |
1da177e4 LT |
2729 | return; |
2730 | } | |
2731 | ||
2732 | isec->sid = newsid; | |
2733 | return; | |
2734 | } | |
2735 | ||
8f0cfa52 | 2736 | static int selinux_inode_getxattr(struct dentry *dentry, const char *name) |
1da177e4 | 2737 | { |
1da177e4 LT |
2738 | return dentry_has_perm(current, NULL, dentry, FILE__GETATTR); |
2739 | } | |
2740 | ||
828dfe1d | 2741 | static int selinux_inode_listxattr(struct dentry *dentry) |
1da177e4 LT |
2742 | { |
2743 | return dentry_has_perm(current, NULL, dentry, FILE__GETATTR); | |
2744 | } | |
2745 | ||
8f0cfa52 | 2746 | static int selinux_inode_removexattr(struct dentry *dentry, const char *name) |
1da177e4 | 2747 | { |
b5376771 SH |
2748 | if (strcmp(name, XATTR_NAME_SELINUX)) |
2749 | return selinux_inode_setotherxattr(dentry, name); | |
1da177e4 LT |
2750 | |
2751 | /* No one is allowed to remove a SELinux security label. | |
2752 | You can change the label, but all data must be labeled. */ | |
2753 | return -EACCES; | |
2754 | } | |
2755 | ||
d381d8a9 JM |
2756 | /* |
2757 | * Copy the in-core inode security context value to the user. If the | |
2758 | * getxattr() prior to this succeeded, check to see if we need to | |
2759 | * canonicalize the value to be finally returned to the user. | |
2760 | * | |
2761 | * Permission check is handled by selinux_inode_getxattr hook. | |
2762 | */ | |
42492594 | 2763 | static int selinux_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc) |
1da177e4 | 2764 | { |
42492594 DQ |
2765 | u32 size; |
2766 | int error; | |
2767 | char *context = NULL; | |
1da177e4 | 2768 | struct inode_security_struct *isec = inode->i_security; |
d381d8a9 | 2769 | |
8c8570fb DK |
2770 | if (strcmp(name, XATTR_SELINUX_SUFFIX)) |
2771 | return -EOPNOTSUPP; | |
d381d8a9 | 2772 | |
42492594 DQ |
2773 | error = security_sid_to_context(isec->sid, &context, &size); |
2774 | if (error) | |
2775 | return error; | |
2776 | error = size; | |
2777 | if (alloc) { | |
2778 | *buffer = context; | |
2779 | goto out_nofree; | |
2780 | } | |
2781 | kfree(context); | |
2782 | out_nofree: | |
2783 | return error; | |
1da177e4 LT |
2784 | } |
2785 | ||
2786 | static int selinux_inode_setsecurity(struct inode *inode, const char *name, | |
828dfe1d | 2787 | const void *value, size_t size, int flags) |
1da177e4 LT |
2788 | { |
2789 | struct inode_security_struct *isec = inode->i_security; | |
2790 | u32 newsid; | |
2791 | int rc; | |
2792 | ||
2793 | if (strcmp(name, XATTR_SELINUX_SUFFIX)) | |
2794 | return -EOPNOTSUPP; | |
2795 | ||
2796 | if (!value || !size) | |
2797 | return -EACCES; | |
2798 | ||
828dfe1d | 2799 | rc = security_context_to_sid((void *)value, size, &newsid); |
1da177e4 LT |
2800 | if (rc) |
2801 | return rc; | |
2802 | ||
2803 | isec->sid = newsid; | |
2804 | return 0; | |
2805 | } | |
2806 | ||
2807 | static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size) | |
2808 | { | |
2809 | const int len = sizeof(XATTR_NAME_SELINUX); | |
2810 | if (buffer && len <= buffer_size) | |
2811 | memcpy(buffer, XATTR_NAME_SELINUX, len); | |
2812 | return len; | |
2813 | } | |
2814 | ||
b5376771 SH |
2815 | static int selinux_inode_need_killpriv(struct dentry *dentry) |
2816 | { | |
2817 | return secondary_ops->inode_need_killpriv(dentry); | |
2818 | } | |
2819 | ||
2820 | static int selinux_inode_killpriv(struct dentry *dentry) | |
2821 | { | |
2822 | return secondary_ops->inode_killpriv(dentry); | |
2823 | } | |
2824 | ||
713a04ae AD |
2825 | static void selinux_inode_getsecid(const struct inode *inode, u32 *secid) |
2826 | { | |
2827 | struct inode_security_struct *isec = inode->i_security; | |
2828 | *secid = isec->sid; | |
2829 | } | |
2830 | ||
1da177e4 LT |
2831 | /* file security operations */ |
2832 | ||
788e7dd4 | 2833 | static int selinux_revalidate_file_permission(struct file *file, int mask) |
1da177e4 | 2834 | { |
7420ed23 | 2835 | int rc; |
3d5ff529 | 2836 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
2837 | |
2838 | if (!mask) { | |
2839 | /* No permission to check. Existence test. */ | |
2840 | return 0; | |
2841 | } | |
2842 | ||
2843 | /* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */ | |
2844 | if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE)) | |
2845 | mask |= MAY_APPEND; | |
2846 | ||
7420ed23 VY |
2847 | rc = file_has_perm(current, file, |
2848 | file_mask_to_av(inode->i_mode, mask)); | |
2849 | if (rc) | |
2850 | return rc; | |
2851 | ||
2852 | return selinux_netlbl_inode_permission(inode, mask); | |
1da177e4 LT |
2853 | } |
2854 | ||
788e7dd4 YN |
2855 | static int selinux_file_permission(struct file *file, int mask) |
2856 | { | |
2857 | struct inode *inode = file->f_path.dentry->d_inode; | |
2858 | struct task_security_struct *tsec = current->security; | |
2859 | struct file_security_struct *fsec = file->f_security; | |
2860 | struct inode_security_struct *isec = inode->i_security; | |
2861 | ||
2862 | if (!mask) { | |
2863 | /* No permission to check. Existence test. */ | |
2864 | return 0; | |
2865 | } | |
2866 | ||
2867 | if (tsec->sid == fsec->sid && fsec->isid == isec->sid | |
2868 | && fsec->pseqno == avc_policy_seqno()) | |
2869 | return selinux_netlbl_inode_permission(inode, mask); | |
2870 | ||
2871 | return selinux_revalidate_file_permission(file, mask); | |
2872 | } | |
2873 | ||
1da177e4 LT |
2874 | static int selinux_file_alloc_security(struct file *file) |
2875 | { | |
2876 | return file_alloc_security(file); | |
2877 | } | |
2878 | ||
2879 | static void selinux_file_free_security(struct file *file) | |
2880 | { | |
2881 | file_free_security(file); | |
2882 | } | |
2883 | ||
2884 | static int selinux_file_ioctl(struct file *file, unsigned int cmd, | |
2885 | unsigned long arg) | |
2886 | { | |
2887 | int error = 0; | |
2888 | ||
2889 | switch (cmd) { | |
828dfe1d EP |
2890 | case FIONREAD: |
2891 | /* fall through */ | |
2892 | case FIBMAP: | |
2893 | /* fall through */ | |
2894 | case FIGETBSZ: | |
2895 | /* fall through */ | |
2896 | case EXT2_IOC_GETFLAGS: | |
2897 | /* fall through */ | |
2898 | case EXT2_IOC_GETVERSION: | |
2899 | error = file_has_perm(current, file, FILE__GETATTR); | |
2900 | break; | |
1da177e4 | 2901 | |
828dfe1d EP |
2902 | case EXT2_IOC_SETFLAGS: |
2903 | /* fall through */ | |
2904 | case EXT2_IOC_SETVERSION: | |
2905 | error = file_has_perm(current, file, FILE__SETATTR); | |
2906 | break; | |
1da177e4 | 2907 | |
828dfe1d EP |
2908 | /* sys_ioctl() checks */ |
2909 | case FIONBIO: | |
2910 | /* fall through */ | |
2911 | case FIOASYNC: | |
2912 | error = file_has_perm(current, file, 0); | |
2913 | break; | |
1da177e4 | 2914 | |
828dfe1d EP |
2915 | case KDSKBENT: |
2916 | case KDSKBSENT: | |
2917 | error = task_has_capability(current, CAP_SYS_TTY_CONFIG); | |
2918 | break; | |
1da177e4 | 2919 | |
828dfe1d EP |
2920 | /* default case assumes that the command will go |
2921 | * to the file's ioctl() function. | |
2922 | */ | |
2923 | default: | |
2924 | error = file_has_perm(current, file, FILE__IOCTL); | |
1da177e4 LT |
2925 | } |
2926 | return error; | |
2927 | } | |
2928 | ||
2929 | static int file_map_prot_check(struct file *file, unsigned long prot, int shared) | |
2930 | { | |
2931 | #ifndef CONFIG_PPC32 | |
2932 | if ((prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) { | |
2933 | /* | |
2934 | * We are making executable an anonymous mapping or a | |
2935 | * private file mapping that will also be writable. | |
2936 | * This has an additional check. | |
2937 | */ | |
2938 | int rc = task_has_perm(current, current, PROCESS__EXECMEM); | |
2939 | if (rc) | |
2940 | return rc; | |
2941 | } | |
2942 | #endif | |
2943 | ||
2944 | if (file) { | |
2945 | /* read access is always possible with a mapping */ | |
2946 | u32 av = FILE__READ; | |
2947 | ||
2948 | /* write access only matters if the mapping is shared */ | |
2949 | if (shared && (prot & PROT_WRITE)) | |
2950 | av |= FILE__WRITE; | |
2951 | ||
2952 | if (prot & PROT_EXEC) | |
2953 | av |= FILE__EXECUTE; | |
2954 | ||
2955 | return file_has_perm(current, file, av); | |
2956 | } | |
2957 | return 0; | |
2958 | } | |
2959 | ||
2960 | static int selinux_file_mmap(struct file *file, unsigned long reqprot, | |
ed032189 EP |
2961 | unsigned long prot, unsigned long flags, |
2962 | unsigned long addr, unsigned long addr_only) | |
1da177e4 | 2963 | { |
ed032189 | 2964 | int rc = 0; |
828dfe1d | 2965 | u32 sid = ((struct task_security_struct *)(current->security))->sid; |
1da177e4 | 2966 | |
ed032189 EP |
2967 | if (addr < mmap_min_addr) |
2968 | rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT, | |
2969 | MEMPROTECT__MMAP_ZERO, NULL); | |
2970 | if (rc || addr_only) | |
1da177e4 LT |
2971 | return rc; |
2972 | ||
2973 | if (selinux_checkreqprot) | |
2974 | prot = reqprot; | |
2975 | ||
2976 | return file_map_prot_check(file, prot, | |
2977 | (flags & MAP_TYPE) == MAP_SHARED); | |
2978 | } | |
2979 | ||
2980 | static int selinux_file_mprotect(struct vm_area_struct *vma, | |
2981 | unsigned long reqprot, | |
2982 | unsigned long prot) | |
2983 | { | |
2984 | int rc; | |
2985 | ||
2986 | rc = secondary_ops->file_mprotect(vma, reqprot, prot); | |
2987 | if (rc) | |
2988 | return rc; | |
2989 | ||
2990 | if (selinux_checkreqprot) | |
2991 | prot = reqprot; | |
2992 | ||
2993 | #ifndef CONFIG_PPC32 | |
db4c9641 SS |
2994 | if ((prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) { |
2995 | rc = 0; | |
2996 | if (vma->vm_start >= vma->vm_mm->start_brk && | |
2997 | vma->vm_end <= vma->vm_mm->brk) { | |
2998 | rc = task_has_perm(current, current, | |
2999 | PROCESS__EXECHEAP); | |
3000 | } else if (!vma->vm_file && | |
3001 | vma->vm_start <= vma->vm_mm->start_stack && | |
3002 | vma->vm_end >= vma->vm_mm->start_stack) { | |
3003 | rc = task_has_perm(current, current, PROCESS__EXECSTACK); | |
3004 | } else if (vma->vm_file && vma->anon_vma) { | |
3005 | /* | |
3006 | * We are making executable a file mapping that has | |
3007 | * had some COW done. Since pages might have been | |
3008 | * written, check ability to execute the possibly | |
3009 | * modified content. This typically should only | |
3010 | * occur for text relocations. | |
3011 | */ | |
3012 | rc = file_has_perm(current, vma->vm_file, | |
3013 | FILE__EXECMOD); | |
3014 | } | |