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Commit | Line | Data |
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b5e95b48 JJ |
1 | /* |
2 | * AppArmor security module | |
3 | * | |
4 | * This file contains AppArmor LSM hooks. | |
5 | * | |
6 | * Copyright (C) 1998-2008 Novell/SUSE | |
7 | * Copyright 2009-2010 Canonical Ltd. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License as | |
11 | * published by the Free Software Foundation, version 2 of the | |
12 | * License. | |
13 | */ | |
14 | ||
3c4ed7bd | 15 | #include <linux/lsm_hooks.h> |
b5e95b48 JJ |
16 | #include <linux/moduleparam.h> |
17 | #include <linux/mm.h> | |
18 | #include <linux/mman.h> | |
19 | #include <linux/mount.h> | |
20 | #include <linux/namei.h> | |
21 | #include <linux/ptrace.h> | |
22 | #include <linux/ctype.h> | |
23 | #include <linux/sysctl.h> | |
24 | #include <linux/audit.h> | |
3486740a | 25 | #include <linux/user_namespace.h> |
b5e95b48 JJ |
26 | #include <net/sock.h> |
27 | ||
28 | #include "include/apparmor.h" | |
29 | #include "include/apparmorfs.h" | |
30 | #include "include/audit.h" | |
31 | #include "include/capability.h" | |
32 | #include "include/context.h" | |
33 | #include "include/file.h" | |
34 | #include "include/ipc.h" | |
35 | #include "include/path.h" | |
36 | #include "include/policy.h" | |
37 | #include "include/procattr.h" | |
38 | ||
39 | /* Flag indicating whether initialization completed */ | |
40 | int apparmor_initialized __initdata; | |
41 | ||
42 | /* | |
43 | * LSM hook functions | |
44 | */ | |
45 | ||
46 | /* | |
47 | * free the associated aa_task_cxt and put its profiles | |
48 | */ | |
49 | static void apparmor_cred_free(struct cred *cred) | |
50 | { | |
214beaca JJ |
51 | aa_free_task_context(cred_cxt(cred)); |
52 | cred_cxt(cred) = NULL; | |
b5e95b48 JJ |
53 | } |
54 | ||
55 | /* | |
56 | * allocate the apparmor part of blank credentials | |
57 | */ | |
58 | static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
59 | { | |
60 | /* freed by apparmor_cred_free */ | |
61 | struct aa_task_cxt *cxt = aa_alloc_task_context(gfp); | |
62 | if (!cxt) | |
63 | return -ENOMEM; | |
64 | ||
214beaca | 65 | cred_cxt(cred) = cxt; |
b5e95b48 JJ |
66 | return 0; |
67 | } | |
68 | ||
69 | /* | |
70 | * prepare new aa_task_cxt for modification by prepare_cred block | |
71 | */ | |
72 | static int apparmor_cred_prepare(struct cred *new, const struct cred *old, | |
73 | gfp_t gfp) | |
74 | { | |
75 | /* freed by apparmor_cred_free */ | |
76 | struct aa_task_cxt *cxt = aa_alloc_task_context(gfp); | |
77 | if (!cxt) | |
78 | return -ENOMEM; | |
79 | ||
214beaca JJ |
80 | aa_dup_task_context(cxt, cred_cxt(old)); |
81 | cred_cxt(new) = cxt; | |
b5e95b48 JJ |
82 | return 0; |
83 | } | |
84 | ||
85 | /* | |
86 | * transfer the apparmor data to a blank set of creds | |
87 | */ | |
88 | static void apparmor_cred_transfer(struct cred *new, const struct cred *old) | |
89 | { | |
214beaca JJ |
90 | const struct aa_task_cxt *old_cxt = cred_cxt(old); |
91 | struct aa_task_cxt *new_cxt = cred_cxt(new); | |
b5e95b48 JJ |
92 | |
93 | aa_dup_task_context(new_cxt, old_cxt); | |
94 | } | |
95 | ||
96 | static int apparmor_ptrace_access_check(struct task_struct *child, | |
97 | unsigned int mode) | |
98 | { | |
b5e95b48 JJ |
99 | return aa_ptrace(current, child, mode); |
100 | } | |
101 | ||
102 | static int apparmor_ptrace_traceme(struct task_struct *parent) | |
103 | { | |
b5e95b48 JJ |
104 | return aa_ptrace(parent, current, PTRACE_MODE_ATTACH); |
105 | } | |
106 | ||
107 | /* Derived from security/commoncap.c:cap_capget */ | |
108 | static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective, | |
109 | kernel_cap_t *inheritable, kernel_cap_t *permitted) | |
110 | { | |
111 | struct aa_profile *profile; | |
112 | const struct cred *cred; | |
113 | ||
114 | rcu_read_lock(); | |
115 | cred = __task_cred(target); | |
116 | profile = aa_cred_profile(cred); | |
117 | ||
b1d9e6b0 CS |
118 | /* |
119 | * cap_capget is stacked ahead of this and will | |
120 | * initialize effective and permitted. | |
121 | */ | |
25e75dff | 122 | if (!unconfined(profile) && !COMPLAIN_MODE(profile)) { |
b5e95b48 JJ |
123 | *effective = cap_intersect(*effective, profile->caps.allow); |
124 | *permitted = cap_intersect(*permitted, profile->caps.allow); | |
125 | } | |
126 | rcu_read_unlock(); | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
6a9de491 EP |
131 | static int apparmor_capable(const struct cred *cred, struct user_namespace *ns, |
132 | int cap, int audit) | |
b5e95b48 JJ |
133 | { |
134 | struct aa_profile *profile; | |
b1d9e6b0 CS |
135 | int error = 0; |
136 | ||
137 | profile = aa_cred_profile(cred); | |
138 | if (!unconfined(profile)) | |
139 | error = aa_capable(profile, cap, audit); | |
b5e95b48 JJ |
140 | return error; |
141 | } | |
142 | ||
143 | /** | |
144 | * common_perm - basic common permission check wrapper fn for paths | |
145 | * @op: operation being checked | |
146 | * @path: path to check permission of (NOT NULL) | |
147 | * @mask: requested permissions mask | |
148 | * @cond: conditional info for the permission request (NOT NULL) | |
149 | * | |
150 | * Returns: %0 else error code if error or permission denied | |
151 | */ | |
152 | static int common_perm(int op, struct path *path, u32 mask, | |
153 | struct path_cond *cond) | |
154 | { | |
155 | struct aa_profile *profile; | |
156 | int error = 0; | |
157 | ||
158 | profile = __aa_current_profile(); | |
159 | if (!unconfined(profile)) | |
160 | error = aa_path_perm(op, profile, path, 0, mask, cond); | |
161 | ||
162 | return error; | |
163 | } | |
164 | ||
165 | /** | |
166 | * common_perm_dir_dentry - common permission wrapper when path is dir, dentry | |
167 | * @op: operation being checked | |
168 | * @dir: directory of the dentry (NOT NULL) | |
169 | * @dentry: dentry to check (NOT NULL) | |
170 | * @mask: requested permissions mask | |
171 | * @cond: conditional info for the permission request (NOT NULL) | |
172 | * | |
173 | * Returns: %0 else error code if error or permission denied | |
174 | */ | |
175 | static int common_perm_dir_dentry(int op, struct path *dir, | |
176 | struct dentry *dentry, u32 mask, | |
177 | struct path_cond *cond) | |
178 | { | |
179 | struct path path = { dir->mnt, dentry }; | |
180 | ||
181 | return common_perm(op, &path, mask, cond); | |
182 | } | |
183 | ||
184 | /** | |
185 | * common_perm_mnt_dentry - common permission wrapper when mnt, dentry | |
186 | * @op: operation being checked | |
187 | * @mnt: mount point of dentry (NOT NULL) | |
188 | * @dentry: dentry to check (NOT NULL) | |
189 | * @mask: requested permissions mask | |
190 | * | |
191 | * Returns: %0 else error code if error or permission denied | |
192 | */ | |
193 | static int common_perm_mnt_dentry(int op, struct vfsmount *mnt, | |
194 | struct dentry *dentry, u32 mask) | |
195 | { | |
196 | struct path path = { mnt, dentry }; | |
c6f493d6 DH |
197 | struct path_cond cond = { d_backing_inode(dentry)->i_uid, |
198 | d_backing_inode(dentry)->i_mode | |
b5e95b48 JJ |
199 | }; |
200 | ||
201 | return common_perm(op, &path, mask, &cond); | |
202 | } | |
203 | ||
204 | /** | |
205 | * common_perm_rm - common permission wrapper for operations doing rm | |
206 | * @op: operation being checked | |
207 | * @dir: directory that the dentry is in (NOT NULL) | |
208 | * @dentry: dentry being rm'd (NOT NULL) | |
209 | * @mask: requested permission mask | |
210 | * | |
211 | * Returns: %0 else error code if error or permission denied | |
212 | */ | |
213 | static int common_perm_rm(int op, struct path *dir, | |
214 | struct dentry *dentry, u32 mask) | |
215 | { | |
c6f493d6 | 216 | struct inode *inode = d_backing_inode(dentry); |
b5e95b48 JJ |
217 | struct path_cond cond = { }; |
218 | ||
7ac2856d | 219 | if (!inode || !dir->mnt || !mediated_filesystem(dentry)) |
b5e95b48 JJ |
220 | return 0; |
221 | ||
222 | cond.uid = inode->i_uid; | |
223 | cond.mode = inode->i_mode; | |
224 | ||
225 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
226 | } | |
227 | ||
228 | /** | |
229 | * common_perm_create - common permission wrapper for operations doing create | |
230 | * @op: operation being checked | |
231 | * @dir: directory that dentry will be created in (NOT NULL) | |
232 | * @dentry: dentry to create (NOT NULL) | |
233 | * @mask: request permission mask | |
234 | * @mode: created file mode | |
235 | * | |
236 | * Returns: %0 else error code if error or permission denied | |
237 | */ | |
238 | static int common_perm_create(int op, struct path *dir, struct dentry *dentry, | |
239 | u32 mask, umode_t mode) | |
240 | { | |
241 | struct path_cond cond = { current_fsuid(), mode }; | |
242 | ||
7ac2856d | 243 | if (!dir->mnt || !mediated_filesystem(dir->dentry)) |
b5e95b48 JJ |
244 | return 0; |
245 | ||
246 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
247 | } | |
248 | ||
249 | static int apparmor_path_unlink(struct path *dir, struct dentry *dentry) | |
250 | { | |
251 | return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE); | |
252 | } | |
253 | ||
254 | static int apparmor_path_mkdir(struct path *dir, struct dentry *dentry, | |
4572befe | 255 | umode_t mode) |
b5e95b48 JJ |
256 | { |
257 | return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE, | |
258 | S_IFDIR); | |
259 | } | |
260 | ||
261 | static int apparmor_path_rmdir(struct path *dir, struct dentry *dentry) | |
262 | { | |
263 | return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE); | |
264 | } | |
265 | ||
266 | static int apparmor_path_mknod(struct path *dir, struct dentry *dentry, | |
04fc66e7 | 267 | umode_t mode, unsigned int dev) |
b5e95b48 JJ |
268 | { |
269 | return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode); | |
270 | } | |
271 | ||
4d6ec10b | 272 | static int apparmor_path_truncate(struct path *path) |
b5e95b48 | 273 | { |
c6f493d6 DH |
274 | struct path_cond cond = { d_backing_inode(path->dentry)->i_uid, |
275 | d_backing_inode(path->dentry)->i_mode | |
b5e95b48 JJ |
276 | }; |
277 | ||
7ac2856d | 278 | if (!path->mnt || !mediated_filesystem(path->dentry)) |
b5e95b48 JJ |
279 | return 0; |
280 | ||
281 | return common_perm(OP_TRUNC, path, MAY_WRITE | AA_MAY_META_WRITE, | |
282 | &cond); | |
283 | } | |
284 | ||
285 | static int apparmor_path_symlink(struct path *dir, struct dentry *dentry, | |
286 | const char *old_name) | |
287 | { | |
288 | return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE, | |
289 | S_IFLNK); | |
290 | } | |
291 | ||
292 | static int apparmor_path_link(struct dentry *old_dentry, struct path *new_dir, | |
293 | struct dentry *new_dentry) | |
294 | { | |
295 | struct aa_profile *profile; | |
296 | int error = 0; | |
297 | ||
7ac2856d | 298 | if (!mediated_filesystem(old_dentry)) |
b5e95b48 JJ |
299 | return 0; |
300 | ||
301 | profile = aa_current_profile(); | |
302 | if (!unconfined(profile)) | |
303 | error = aa_path_link(profile, old_dentry, new_dir, new_dentry); | |
304 | return error; | |
305 | } | |
306 | ||
307 | static int apparmor_path_rename(struct path *old_dir, struct dentry *old_dentry, | |
308 | struct path *new_dir, struct dentry *new_dentry) | |
309 | { | |
310 | struct aa_profile *profile; | |
311 | int error = 0; | |
312 | ||
7ac2856d | 313 | if (!mediated_filesystem(old_dentry)) |
b5e95b48 JJ |
314 | return 0; |
315 | ||
316 | profile = aa_current_profile(); | |
317 | if (!unconfined(profile)) { | |
318 | struct path old_path = { old_dir->mnt, old_dentry }; | |
319 | struct path new_path = { new_dir->mnt, new_dentry }; | |
c6f493d6 DH |
320 | struct path_cond cond = { d_backing_inode(old_dentry)->i_uid, |
321 | d_backing_inode(old_dentry)->i_mode | |
b5e95b48 JJ |
322 | }; |
323 | ||
324 | error = aa_path_perm(OP_RENAME_SRC, profile, &old_path, 0, | |
325 | MAY_READ | AA_MAY_META_READ | MAY_WRITE | | |
326 | AA_MAY_META_WRITE | AA_MAY_DELETE, | |
327 | &cond); | |
328 | if (!error) | |
329 | error = aa_path_perm(OP_RENAME_DEST, profile, &new_path, | |
330 | 0, MAY_WRITE | AA_MAY_META_WRITE | | |
331 | AA_MAY_CREATE, &cond); | |
332 | ||
333 | } | |
334 | return error; | |
335 | } | |
336 | ||
cdcf116d | 337 | static int apparmor_path_chmod(struct path *path, umode_t mode) |
b5e95b48 | 338 | { |
7ac2856d | 339 | if (!mediated_filesystem(path->dentry)) |
b5e95b48 JJ |
340 | return 0; |
341 | ||
cdcf116d | 342 | return common_perm_mnt_dentry(OP_CHMOD, path->mnt, path->dentry, AA_MAY_CHMOD); |
b5e95b48 JJ |
343 | } |
344 | ||
d2b31ca6 | 345 | static int apparmor_path_chown(struct path *path, kuid_t uid, kgid_t gid) |
b5e95b48 | 346 | { |
c6f493d6 DH |
347 | struct path_cond cond = { d_backing_inode(path->dentry)->i_uid, |
348 | d_backing_inode(path->dentry)->i_mode | |
b5e95b48 JJ |
349 | }; |
350 | ||
7ac2856d | 351 | if (!mediated_filesystem(path->dentry)) |
b5e95b48 JJ |
352 | return 0; |
353 | ||
354 | return common_perm(OP_CHOWN, path, AA_MAY_CHOWN, &cond); | |
355 | } | |
356 | ||
3f7036a0 | 357 | static int apparmor_inode_getattr(const struct path *path) |
b5e95b48 | 358 | { |
3f7036a0 | 359 | if (!mediated_filesystem(path->dentry)) |
b5e95b48 JJ |
360 | return 0; |
361 | ||
3f7036a0 | 362 | return common_perm_mnt_dentry(OP_GETATTR, path->mnt, path->dentry, |
b5e95b48 JJ |
363 | AA_MAY_META_READ); |
364 | } | |
365 | ||
83d49856 | 366 | static int apparmor_file_open(struct file *file, const struct cred *cred) |
b5e95b48 JJ |
367 | { |
368 | struct aa_file_cxt *fcxt = file->f_security; | |
369 | struct aa_profile *profile; | |
370 | int error = 0; | |
371 | ||
7ac2856d | 372 | if (!mediated_filesystem(file->f_path.dentry)) |
b5e95b48 JJ |
373 | return 0; |
374 | ||
375 | /* If in exec, permission is handled by bprm hooks. | |
376 | * Cache permissions granted by the previous exec check, with | |
377 | * implicit read and executable mmap which are required to | |
378 | * actually execute the image. | |
379 | */ | |
380 | if (current->in_execve) { | |
381 | fcxt->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP; | |
382 | return 0; | |
383 | } | |
384 | ||
385 | profile = aa_cred_profile(cred); | |
386 | if (!unconfined(profile)) { | |
496ad9aa | 387 | struct inode *inode = file_inode(file); |
b5e95b48 JJ |
388 | struct path_cond cond = { inode->i_uid, inode->i_mode }; |
389 | ||
390 | error = aa_path_perm(OP_OPEN, profile, &file->f_path, 0, | |
391 | aa_map_file_to_perms(file), &cond); | |
392 | /* todo cache full allowed permissions set and state */ | |
393 | fcxt->allow = aa_map_file_to_perms(file); | |
394 | } | |
395 | ||
396 | return error; | |
397 | } | |
398 | ||
399 | static int apparmor_file_alloc_security(struct file *file) | |
400 | { | |
401 | /* freed by apparmor_file_free_security */ | |
402 | file->f_security = aa_alloc_file_context(GFP_KERNEL); | |
403 | if (!file->f_security) | |
404 | return -ENOMEM; | |
405 | return 0; | |
406 | ||
407 | } | |
408 | ||
409 | static void apparmor_file_free_security(struct file *file) | |
410 | { | |
411 | struct aa_file_cxt *cxt = file->f_security; | |
412 | ||
413 | aa_free_file_context(cxt); | |
414 | } | |
415 | ||
416 | static int common_file_perm(int op, struct file *file, u32 mask) | |
417 | { | |
418 | struct aa_file_cxt *fcxt = file->f_security; | |
419 | struct aa_profile *profile, *fprofile = aa_cred_profile(file->f_cred); | |
420 | int error = 0; | |
421 | ||
422 | BUG_ON(!fprofile); | |
423 | ||
424 | if (!file->f_path.mnt || | |
7ac2856d | 425 | !mediated_filesystem(file->f_path.dentry)) |
b5e95b48 JJ |
426 | return 0; |
427 | ||
428 | profile = __aa_current_profile(); | |
429 | ||
430 | /* revalidate access, if task is unconfined, or the cached cred | |
431 | * doesn't match or if the request is for more permissions than | |
432 | * was granted. | |
433 | * | |
434 | * Note: the test for !unconfined(fprofile) is to handle file | |
435 | * delegation from unconfined tasks | |
436 | */ | |
437 | if (!unconfined(profile) && !unconfined(fprofile) && | |
438 | ((fprofile != profile) || (mask & ~fcxt->allow))) | |
439 | error = aa_file_perm(op, profile, file, mask); | |
440 | ||
441 | return error; | |
442 | } | |
443 | ||
444 | static int apparmor_file_permission(struct file *file, int mask) | |
445 | { | |
446 | return common_file_perm(OP_FPERM, file, mask); | |
447 | } | |
448 | ||
449 | static int apparmor_file_lock(struct file *file, unsigned int cmd) | |
450 | { | |
451 | u32 mask = AA_MAY_LOCK; | |
452 | ||
453 | if (cmd == F_WRLCK) | |
454 | mask |= MAY_WRITE; | |
455 | ||
456 | return common_file_perm(OP_FLOCK, file, mask); | |
457 | } | |
458 | ||
459 | static int common_mmap(int op, struct file *file, unsigned long prot, | |
460 | unsigned long flags) | |
461 | { | |
b5e95b48 JJ |
462 | int mask = 0; |
463 | ||
464 | if (!file || !file->f_security) | |
465 | return 0; | |
466 | ||
467 | if (prot & PROT_READ) | |
468 | mask |= MAY_READ; | |
469 | /* | |
470 | * Private mappings don't require write perms since they don't | |
471 | * write back to the files | |
472 | */ | |
473 | if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE)) | |
474 | mask |= MAY_WRITE; | |
475 | if (prot & PROT_EXEC) | |
476 | mask |= AA_EXEC_MMAP; | |
477 | ||
b5e95b48 JJ |
478 | return common_file_perm(op, file, mask); |
479 | } | |
480 | ||
e5467859 AV |
481 | static int apparmor_mmap_file(struct file *file, unsigned long reqprot, |
482 | unsigned long prot, unsigned long flags) | |
b5e95b48 | 483 | { |
b5e95b48 JJ |
484 | return common_mmap(OP_FMMAP, file, prot, flags); |
485 | } | |
486 | ||
487 | static int apparmor_file_mprotect(struct vm_area_struct *vma, | |
488 | unsigned long reqprot, unsigned long prot) | |
489 | { | |
490 | return common_mmap(OP_FMPROT, vma->vm_file, prot, | |
491 | !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0); | |
492 | } | |
493 | ||
494 | static int apparmor_getprocattr(struct task_struct *task, char *name, | |
495 | char **value) | |
496 | { | |
497 | int error = -ENOENT; | |
b5e95b48 JJ |
498 | /* released below */ |
499 | const struct cred *cred = get_task_cred(task); | |
214beaca | 500 | struct aa_task_cxt *cxt = cred_cxt(cred); |
77b071b3 | 501 | struct aa_profile *profile = NULL; |
b5e95b48 JJ |
502 | |
503 | if (strcmp(name, "current") == 0) | |
77b071b3 | 504 | profile = aa_get_newest_profile(cxt->profile); |
b5e95b48 | 505 | else if (strcmp(name, "prev") == 0 && cxt->previous) |
77b071b3 | 506 | profile = aa_get_newest_profile(cxt->previous); |
b5e95b48 | 507 | else if (strcmp(name, "exec") == 0 && cxt->onexec) |
77b071b3 | 508 | profile = aa_get_newest_profile(cxt->onexec); |
b5e95b48 JJ |
509 | else |
510 | error = -EINVAL; | |
511 | ||
77b071b3 JJ |
512 | if (profile) |
513 | error = aa_getprocattr(profile, value); | |
514 | ||
515 | aa_put_profile(profile); | |
b5e95b48 JJ |
516 | put_cred(cred); |
517 | ||
518 | return error; | |
519 | } | |
520 | ||
521 | static int apparmor_setprocattr(struct task_struct *task, char *name, | |
522 | void *value, size_t size) | |
523 | { | |
3eea57c2 JJ |
524 | struct common_audit_data sa; |
525 | struct apparmor_audit_data aad = {0,}; | |
b5e95b48 JJ |
526 | char *command, *args = value; |
527 | size_t arg_size; | |
528 | int error; | |
529 | ||
530 | if (size == 0) | |
531 | return -EINVAL; | |
532 | /* args points to a PAGE_SIZE buffer, AppArmor requires that | |
533 | * the buffer must be null terminated or have size <= PAGE_SIZE -1 | |
534 | * so that AppArmor can null terminate them | |
535 | */ | |
536 | if (args[size - 1] != '\0') { | |
537 | if (size == PAGE_SIZE) | |
538 | return -EINVAL; | |
539 | args[size] = '\0'; | |
540 | } | |
541 | ||
542 | /* task can only write its own attributes */ | |
543 | if (current != task) | |
544 | return -EACCES; | |
545 | ||
546 | args = value; | |
547 | args = strim(args); | |
548 | command = strsep(&args, " "); | |
549 | if (!args) | |
550 | return -EINVAL; | |
551 | args = skip_spaces(args); | |
552 | if (!*args) | |
553 | return -EINVAL; | |
554 | ||
555 | arg_size = size - (args - (char *) value); | |
556 | if (strcmp(name, "current") == 0) { | |
557 | if (strcmp(command, "changehat") == 0) { | |
558 | error = aa_setprocattr_changehat(args, arg_size, | |
559 | !AA_DO_TEST); | |
560 | } else if (strcmp(command, "permhat") == 0) { | |
561 | error = aa_setprocattr_changehat(args, arg_size, | |
562 | AA_DO_TEST); | |
563 | } else if (strcmp(command, "changeprofile") == 0) { | |
564 | error = aa_setprocattr_changeprofile(args, !AA_ONEXEC, | |
565 | !AA_DO_TEST); | |
566 | } else if (strcmp(command, "permprofile") == 0) { | |
567 | error = aa_setprocattr_changeprofile(args, !AA_ONEXEC, | |
568 | AA_DO_TEST); | |
3eea57c2 JJ |
569 | } else |
570 | goto fail; | |
b5e95b48 | 571 | } else if (strcmp(name, "exec") == 0) { |
3eea57c2 JJ |
572 | if (strcmp(command, "exec") == 0) |
573 | error = aa_setprocattr_changeprofile(args, AA_ONEXEC, | |
574 | !AA_DO_TEST); | |
575 | else | |
576 | goto fail; | |
577 | } else | |
b5e95b48 JJ |
578 | /* only support the "current" and "exec" process attributes */ |
579 | return -EINVAL; | |
3eea57c2 | 580 | |
b5e95b48 JJ |
581 | if (!error) |
582 | error = size; | |
583 | return error; | |
3eea57c2 JJ |
584 | |
585 | fail: | |
586 | sa.type = LSM_AUDIT_DATA_NONE; | |
587 | sa.aad = &aad; | |
588 | aad.profile = aa_current_profile(); | |
589 | aad.op = OP_SETPROCATTR; | |
590 | aad.info = name; | |
591 | aad.error = -EINVAL; | |
592 | aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL); | |
593 | return -EINVAL; | |
b5e95b48 JJ |
594 | } |
595 | ||
7cb4dc9f JS |
596 | static int apparmor_task_setrlimit(struct task_struct *task, |
597 | unsigned int resource, struct rlimit *new_rlim) | |
b5e95b48 | 598 | { |
1780f2d3 | 599 | struct aa_profile *profile = __aa_current_profile(); |
b5e95b48 JJ |
600 | int error = 0; |
601 | ||
602 | if (!unconfined(profile)) | |
3a2dc838 | 603 | error = aa_task_setrlimit(profile, task, resource, new_rlim); |
b5e95b48 JJ |
604 | |
605 | return error; | |
606 | } | |
607 | ||
b1d9e6b0 | 608 | static struct security_hook_list apparmor_hooks[] = { |
e20b043a CS |
609 | LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check), |
610 | LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme), | |
611 | LSM_HOOK_INIT(capget, apparmor_capget), | |
612 | LSM_HOOK_INIT(capable, apparmor_capable), | |
613 | ||
614 | LSM_HOOK_INIT(path_link, apparmor_path_link), | |
615 | LSM_HOOK_INIT(path_unlink, apparmor_path_unlink), | |
616 | LSM_HOOK_INIT(path_symlink, apparmor_path_symlink), | |
617 | LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir), | |
618 | LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir), | |
619 | LSM_HOOK_INIT(path_mknod, apparmor_path_mknod), | |
620 | LSM_HOOK_INIT(path_rename, apparmor_path_rename), | |
621 | LSM_HOOK_INIT(path_chmod, apparmor_path_chmod), | |
622 | LSM_HOOK_INIT(path_chown, apparmor_path_chown), | |
623 | LSM_HOOK_INIT(path_truncate, apparmor_path_truncate), | |
624 | LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr), | |
625 | ||
626 | LSM_HOOK_INIT(file_open, apparmor_file_open), | |
627 | LSM_HOOK_INIT(file_permission, apparmor_file_permission), | |
628 | LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security), | |
629 | LSM_HOOK_INIT(file_free_security, apparmor_file_free_security), | |
630 | LSM_HOOK_INIT(mmap_file, apparmor_mmap_file), | |
e20b043a CS |
631 | LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect), |
632 | LSM_HOOK_INIT(file_lock, apparmor_file_lock), | |
633 | ||
634 | LSM_HOOK_INIT(getprocattr, apparmor_getprocattr), | |
635 | LSM_HOOK_INIT(setprocattr, apparmor_setprocattr), | |
636 | ||
637 | LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank), | |
638 | LSM_HOOK_INIT(cred_free, apparmor_cred_free), | |
639 | LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare), | |
640 | LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer), | |
641 | ||
642 | LSM_HOOK_INIT(bprm_set_creds, apparmor_bprm_set_creds), | |
643 | LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds), | |
644 | LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds), | |
645 | LSM_HOOK_INIT(bprm_secureexec, apparmor_bprm_secureexec), | |
646 | ||
647 | LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit), | |
b5e95b48 JJ |
648 | }; |
649 | ||
650 | /* | |
651 | * AppArmor sysfs module parameters | |
652 | */ | |
653 | ||
101d6c82 SR |
654 | static int param_set_aabool(const char *val, const struct kernel_param *kp); |
655 | static int param_get_aabool(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 656 | #define param_check_aabool param_check_bool |
9c27847d | 657 | static const struct kernel_param_ops param_ops_aabool = { |
6a4c2643 | 658 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
659 | .set = param_set_aabool, |
660 | .get = param_get_aabool | |
661 | }; | |
b5e95b48 | 662 | |
101d6c82 SR |
663 | static int param_set_aauint(const char *val, const struct kernel_param *kp); |
664 | static int param_get_aauint(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 665 | #define param_check_aauint param_check_uint |
9c27847d | 666 | static const struct kernel_param_ops param_ops_aauint = { |
101d6c82 SR |
667 | .set = param_set_aauint, |
668 | .get = param_get_aauint | |
669 | }; | |
b5e95b48 | 670 | |
101d6c82 SR |
671 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp); |
672 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 673 | #define param_check_aalockpolicy param_check_bool |
9c27847d | 674 | static const struct kernel_param_ops param_ops_aalockpolicy = { |
6a4c2643 | 675 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
676 | .set = param_set_aalockpolicy, |
677 | .get = param_get_aalockpolicy | |
678 | }; | |
b5e95b48 JJ |
679 | |
680 | static int param_set_audit(const char *val, struct kernel_param *kp); | |
681 | static int param_get_audit(char *buffer, struct kernel_param *kp); | |
b5e95b48 JJ |
682 | |
683 | static int param_set_mode(const char *val, struct kernel_param *kp); | |
684 | static int param_get_mode(char *buffer, struct kernel_param *kp); | |
b5e95b48 JJ |
685 | |
686 | /* Flag values, also controllable via /sys/module/apparmor/parameters | |
687 | * We define special types as we want to do additional mediation. | |
688 | */ | |
689 | ||
690 | /* AppArmor global enforcement switch - complain, enforce, kill */ | |
691 | enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE; | |
692 | module_param_call(mode, param_set_mode, param_get_mode, | |
693 | &aa_g_profile_mode, S_IRUSR | S_IWUSR); | |
694 | ||
695 | /* Debug mode */ | |
90ab5ee9 | 696 | bool aa_g_debug; |
b5e95b48 JJ |
697 | module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR); |
698 | ||
699 | /* Audit mode */ | |
700 | enum audit_mode aa_g_audit; | |
701 | module_param_call(audit, param_set_audit, param_get_audit, | |
702 | &aa_g_audit, S_IRUSR | S_IWUSR); | |
703 | ||
704 | /* Determines if audit header is included in audited messages. This | |
705 | * provides more context if the audit daemon is not running | |
706 | */ | |
90ab5ee9 | 707 | bool aa_g_audit_header = 1; |
b5e95b48 JJ |
708 | module_param_named(audit_header, aa_g_audit_header, aabool, |
709 | S_IRUSR | S_IWUSR); | |
710 | ||
711 | /* lock out loading/removal of policy | |
712 | * TODO: add in at boot loading of policy, which is the only way to | |
713 | * load policy, if lock_policy is set | |
714 | */ | |
90ab5ee9 | 715 | bool aa_g_lock_policy; |
b5e95b48 JJ |
716 | module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy, |
717 | S_IRUSR | S_IWUSR); | |
718 | ||
719 | /* Syscall logging mode */ | |
90ab5ee9 | 720 | bool aa_g_logsyscall; |
b5e95b48 JJ |
721 | module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR); |
722 | ||
723 | /* Maximum pathname length before accesses will start getting rejected */ | |
724 | unsigned int aa_g_path_max = 2 * PATH_MAX; | |
725 | module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR | S_IWUSR); | |
726 | ||
727 | /* Determines how paranoid loading of policy is and how much verification | |
728 | * on the loaded policy is done. | |
729 | */ | |
90ab5ee9 | 730 | bool aa_g_paranoid_load = 1; |
b5e95b48 JJ |
731 | module_param_named(paranoid_load, aa_g_paranoid_load, aabool, |
732 | S_IRUSR | S_IWUSR); | |
733 | ||
734 | /* Boot time disable flag */ | |
90ab5ee9 | 735 | static bool apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE; |
c611616c | 736 | module_param_named(enabled, apparmor_enabled, bool, S_IRUGO); |
b5e95b48 JJ |
737 | |
738 | static int __init apparmor_enabled_setup(char *str) | |
739 | { | |
740 | unsigned long enabled; | |
29707b20 | 741 | int error = kstrtoul(str, 0, &enabled); |
b5e95b48 JJ |
742 | if (!error) |
743 | apparmor_enabled = enabled ? 1 : 0; | |
744 | return 1; | |
745 | } | |
746 | ||
747 | __setup("apparmor=", apparmor_enabled_setup); | |
748 | ||
749 | /* set global flag turning off the ability to load policy */ | |
101d6c82 | 750 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp) |
b5e95b48 JJ |
751 | { |
752 | if (!capable(CAP_MAC_ADMIN)) | |
753 | return -EPERM; | |
754 | if (aa_g_lock_policy) | |
755 | return -EACCES; | |
756 | return param_set_bool(val, kp); | |
757 | } | |
758 | ||
101d6c82 | 759 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp) |
b5e95b48 JJ |
760 | { |
761 | if (!capable(CAP_MAC_ADMIN)) | |
762 | return -EPERM; | |
763 | return param_get_bool(buffer, kp); | |
764 | } | |
765 | ||
101d6c82 | 766 | static int param_set_aabool(const char *val, const struct kernel_param *kp) |
b5e95b48 JJ |
767 | { |
768 | if (!capable(CAP_MAC_ADMIN)) | |
769 | return -EPERM; | |
770 | return param_set_bool(val, kp); | |
771 | } | |
772 | ||
101d6c82 | 773 | static int param_get_aabool(char *buffer, const struct kernel_param *kp) |
b5e95b48 JJ |
774 | { |
775 | if (!capable(CAP_MAC_ADMIN)) | |
776 | return -EPERM; | |
777 | return param_get_bool(buffer, kp); | |
778 | } | |
779 | ||
101d6c82 | 780 | static int param_set_aauint(const char *val, const struct kernel_param *kp) |
b5e95b48 JJ |
781 | { |
782 | if (!capable(CAP_MAC_ADMIN)) | |
783 | return -EPERM; | |
784 | return param_set_uint(val, kp); | |
785 | } | |
786 | ||
101d6c82 | 787 | static int param_get_aauint(char *buffer, const struct kernel_param *kp) |
b5e95b48 JJ |
788 | { |
789 | if (!capable(CAP_MAC_ADMIN)) | |
790 | return -EPERM; | |
791 | return param_get_uint(buffer, kp); | |
792 | } | |
793 | ||
794 | static int param_get_audit(char *buffer, struct kernel_param *kp) | |
795 | { | |
796 | if (!capable(CAP_MAC_ADMIN)) | |
797 | return -EPERM; | |
798 | ||
799 | if (!apparmor_enabled) | |
800 | return -EINVAL; | |
801 | ||
802 | return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]); | |
803 | } | |
804 | ||
805 | static int param_set_audit(const char *val, struct kernel_param *kp) | |
806 | { | |
807 | int i; | |
808 | if (!capable(CAP_MAC_ADMIN)) | |
809 | return -EPERM; | |
810 | ||
811 | if (!apparmor_enabled) | |
812 | return -EINVAL; | |
813 | ||
814 | if (!val) | |
815 | return -EINVAL; | |
816 | ||
817 | for (i = 0; i < AUDIT_MAX_INDEX; i++) { | |
818 | if (strcmp(val, audit_mode_names[i]) == 0) { | |
819 | aa_g_audit = i; | |
820 | return 0; | |
821 | } | |
822 | } | |
823 | ||
824 | return -EINVAL; | |
825 | } | |
826 | ||
827 | static int param_get_mode(char *buffer, struct kernel_param *kp) | |
828 | { | |
829 | if (!capable(CAP_MAC_ADMIN)) | |
830 | return -EPERM; | |
831 | ||
832 | if (!apparmor_enabled) | |
833 | return -EINVAL; | |
834 | ||
0d259f04 | 835 | return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]); |
b5e95b48 JJ |
836 | } |
837 | ||
838 | static int param_set_mode(const char *val, struct kernel_param *kp) | |
839 | { | |
840 | int i; | |
841 | if (!capable(CAP_MAC_ADMIN)) | |
842 | return -EPERM; | |
843 | ||
844 | if (!apparmor_enabled) | |
845 | return -EINVAL; | |
846 | ||
847 | if (!val) | |
848 | return -EINVAL; | |
849 | ||
0d259f04 JJ |
850 | for (i = 0; i < APPARMOR_MODE_NAMES_MAX_INDEX; i++) { |
851 | if (strcmp(val, aa_profile_mode_names[i]) == 0) { | |
b5e95b48 JJ |
852 | aa_g_profile_mode = i; |
853 | return 0; | |
854 | } | |
855 | } | |
856 | ||
857 | return -EINVAL; | |
858 | } | |
859 | ||
860 | /* | |
861 | * AppArmor init functions | |
862 | */ | |
863 | ||
864 | /** | |
865 | * set_init_cxt - set a task context and profile on the first task. | |
866 | * | |
867 | * TODO: allow setting an alternate profile than unconfined | |
868 | */ | |
869 | static int __init set_init_cxt(void) | |
870 | { | |
871 | struct cred *cred = (struct cred *)current->real_cred; | |
872 | struct aa_task_cxt *cxt; | |
873 | ||
874 | cxt = aa_alloc_task_context(GFP_KERNEL); | |
875 | if (!cxt) | |
876 | return -ENOMEM; | |
877 | ||
878 | cxt->profile = aa_get_profile(root_ns->unconfined); | |
214beaca | 879 | cred_cxt(cred) = cxt; |
b5e95b48 JJ |
880 | |
881 | return 0; | |
882 | } | |
883 | ||
884 | static int __init apparmor_init(void) | |
885 | { | |
886 | int error; | |
887 | ||
b1d9e6b0 | 888 | if (!apparmor_enabled || !security_module_enable("apparmor")) { |
b5e95b48 JJ |
889 | aa_info_message("AppArmor disabled by boot time parameter"); |
890 | apparmor_enabled = 0; | |
891 | return 0; | |
892 | } | |
893 | ||
894 | error = aa_alloc_root_ns(); | |
895 | if (error) { | |
896 | AA_ERROR("Unable to allocate default profile namespace\n"); | |
897 | goto alloc_out; | |
898 | } | |
899 | ||
900 | error = set_init_cxt(); | |
901 | if (error) { | |
902 | AA_ERROR("Failed to set context on init task\n"); | |
b1d9e6b0 CS |
903 | aa_free_root_ns(); |
904 | goto alloc_out; | |
b5e95b48 | 905 | } |
b1d9e6b0 | 906 | security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks)); |
b5e95b48 JJ |
907 | |
908 | /* Report that AppArmor successfully initialized */ | |
909 | apparmor_initialized = 1; | |
910 | if (aa_g_profile_mode == APPARMOR_COMPLAIN) | |
911 | aa_info_message("AppArmor initialized: complain mode enabled"); | |
912 | else if (aa_g_profile_mode == APPARMOR_KILL) | |
913 | aa_info_message("AppArmor initialized: kill mode enabled"); | |
914 | else | |
915 | aa_info_message("AppArmor initialized"); | |
916 | ||
917 | return error; | |
918 | ||
b5e95b48 JJ |
919 | alloc_out: |
920 | aa_destroy_aafs(); | |
921 | ||
922 | apparmor_enabled = 0; | |
923 | return error; | |
b5e95b48 JJ |
924 | } |
925 | ||
926 | security_initcall(apparmor_init); |