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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" | |
cff281f6 | 37 | #include "include/policy_ns.h" |
b5e95b48 JJ |
38 | #include "include/procattr.h" |
39 | ||
40 | /* Flag indicating whether initialization completed */ | |
41 | int apparmor_initialized __initdata; | |
42 | ||
43 | /* | |
44 | * LSM hook functions | |
45 | */ | |
46 | ||
47 | /* | |
48 | * free the associated aa_task_cxt and put its profiles | |
49 | */ | |
50 | static void apparmor_cred_free(struct cred *cred) | |
51 | { | |
214beaca JJ |
52 | aa_free_task_context(cred_cxt(cred)); |
53 | cred_cxt(cred) = NULL; | |
b5e95b48 JJ |
54 | } |
55 | ||
56 | /* | |
57 | * allocate the apparmor part of blank credentials | |
58 | */ | |
59 | static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
60 | { | |
61 | /* freed by apparmor_cred_free */ | |
62 | struct aa_task_cxt *cxt = aa_alloc_task_context(gfp); | |
63 | if (!cxt) | |
64 | return -ENOMEM; | |
65 | ||
214beaca | 66 | cred_cxt(cred) = cxt; |
b5e95b48 JJ |
67 | return 0; |
68 | } | |
69 | ||
70 | /* | |
71 | * prepare new aa_task_cxt for modification by prepare_cred block | |
72 | */ | |
73 | static int apparmor_cred_prepare(struct cred *new, const struct cred *old, | |
74 | gfp_t gfp) | |
75 | { | |
76 | /* freed by apparmor_cred_free */ | |
77 | struct aa_task_cxt *cxt = aa_alloc_task_context(gfp); | |
78 | if (!cxt) | |
79 | return -ENOMEM; | |
80 | ||
214beaca JJ |
81 | aa_dup_task_context(cxt, cred_cxt(old)); |
82 | cred_cxt(new) = cxt; | |
b5e95b48 JJ |
83 | return 0; |
84 | } | |
85 | ||
86 | /* | |
87 | * transfer the apparmor data to a blank set of creds | |
88 | */ | |
89 | static void apparmor_cred_transfer(struct cred *new, const struct cred *old) | |
90 | { | |
214beaca JJ |
91 | const struct aa_task_cxt *old_cxt = cred_cxt(old); |
92 | struct aa_task_cxt *new_cxt = cred_cxt(new); | |
b5e95b48 JJ |
93 | |
94 | aa_dup_task_context(new_cxt, old_cxt); | |
95 | } | |
96 | ||
97 | static int apparmor_ptrace_access_check(struct task_struct *child, | |
98 | unsigned int mode) | |
99 | { | |
b5e95b48 JJ |
100 | return aa_ptrace(current, child, mode); |
101 | } | |
102 | ||
103 | static int apparmor_ptrace_traceme(struct task_struct *parent) | |
104 | { | |
b5e95b48 JJ |
105 | return aa_ptrace(parent, current, PTRACE_MODE_ATTACH); |
106 | } | |
107 | ||
108 | /* Derived from security/commoncap.c:cap_capget */ | |
109 | static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective, | |
110 | kernel_cap_t *inheritable, kernel_cap_t *permitted) | |
111 | { | |
112 | struct aa_profile *profile; | |
113 | const struct cred *cred; | |
114 | ||
115 | rcu_read_lock(); | |
116 | cred = __task_cred(target); | |
117 | profile = aa_cred_profile(cred); | |
118 | ||
b1d9e6b0 CS |
119 | /* |
120 | * cap_capget is stacked ahead of this and will | |
121 | * initialize effective and permitted. | |
122 | */ | |
25e75dff | 123 | if (!unconfined(profile) && !COMPLAIN_MODE(profile)) { |
b5e95b48 JJ |
124 | *effective = cap_intersect(*effective, profile->caps.allow); |
125 | *permitted = cap_intersect(*permitted, profile->caps.allow); | |
126 | } | |
127 | rcu_read_unlock(); | |
128 | ||
129 | return 0; | |
130 | } | |
131 | ||
6a9de491 EP |
132 | static int apparmor_capable(const struct cred *cred, struct user_namespace *ns, |
133 | int cap, int audit) | |
b5e95b48 JJ |
134 | { |
135 | struct aa_profile *profile; | |
b1d9e6b0 CS |
136 | int error = 0; |
137 | ||
138 | profile = aa_cred_profile(cred); | |
139 | if (!unconfined(profile)) | |
140 | error = aa_capable(profile, cap, audit); | |
b5e95b48 JJ |
141 | return error; |
142 | } | |
143 | ||
144 | /** | |
145 | * common_perm - basic common permission check wrapper fn for paths | |
146 | * @op: operation being checked | |
147 | * @path: path to check permission of (NOT NULL) | |
148 | * @mask: requested permissions mask | |
149 | * @cond: conditional info for the permission request (NOT NULL) | |
150 | * | |
151 | * Returns: %0 else error code if error or permission denied | |
152 | */ | |
2c7661ff | 153 | static int common_perm(int op, const struct path *path, u32 mask, |
b5e95b48 JJ |
154 | struct path_cond *cond) |
155 | { | |
156 | struct aa_profile *profile; | |
157 | int error = 0; | |
158 | ||
159 | profile = __aa_current_profile(); | |
160 | if (!unconfined(profile)) | |
161 | error = aa_path_perm(op, profile, path, 0, mask, cond); | |
162 | ||
163 | return error; | |
164 | } | |
165 | ||
166 | /** | |
167 | * common_perm_dir_dentry - common permission wrapper when path is dir, dentry | |
168 | * @op: operation being checked | |
169 | * @dir: directory of the dentry (NOT NULL) | |
170 | * @dentry: dentry to check (NOT NULL) | |
171 | * @mask: requested permissions mask | |
172 | * @cond: conditional info for the permission request (NOT NULL) | |
173 | * | |
174 | * Returns: %0 else error code if error or permission denied | |
175 | */ | |
d6b49f7a | 176 | static int common_perm_dir_dentry(int op, const struct path *dir, |
b5e95b48 JJ |
177 | struct dentry *dentry, u32 mask, |
178 | struct path_cond *cond) | |
179 | { | |
8486adf0 | 180 | struct path path = { .mnt = dir->mnt, .dentry = dentry }; |
b5e95b48 JJ |
181 | |
182 | return common_perm(op, &path, mask, cond); | |
183 | } | |
184 | ||
185 | /** | |
741aca71 | 186 | * common_perm_path - common permission wrapper when mnt, dentry |
b5e95b48 | 187 | * @op: operation being checked |
741aca71 | 188 | * @path: location to check (NOT NULL) |
b5e95b48 JJ |
189 | * @mask: requested permissions mask |
190 | * | |
191 | * Returns: %0 else error code if error or permission denied | |
192 | */ | |
741aca71 | 193 | static inline int common_perm_path(int op, const struct path *path, u32 mask) |
b5e95b48 | 194 | { |
741aca71 AV |
195 | struct path_cond cond = { d_backing_inode(path->dentry)->i_uid, |
196 | d_backing_inode(path->dentry)->i_mode | |
b5e95b48 | 197 | }; |
efeee83a | 198 | if (!path_mediated_fs(path->dentry)) |
741aca71 | 199 | return 0; |
b5e95b48 | 200 | |
741aca71 | 201 | return common_perm(op, path, mask, &cond); |
b5e95b48 JJ |
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 | */ | |
d6b49f7a | 213 | static int common_perm_rm(int op, const struct path *dir, |
b5e95b48 JJ |
214 | struct dentry *dentry, u32 mask) |
215 | { | |
c6f493d6 | 216 | struct inode *inode = d_backing_inode(dentry); |
b5e95b48 JJ |
217 | struct path_cond cond = { }; |
218 | ||
efeee83a | 219 | if (!inode || !path_mediated_fs(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 | */ | |
d6b49f7a AV |
238 | static int common_perm_create(int op, const struct path *dir, |
239 | struct dentry *dentry, u32 mask, umode_t mode) | |
b5e95b48 JJ |
240 | { |
241 | struct path_cond cond = { current_fsuid(), mode }; | |
242 | ||
efeee83a | 243 | if (!path_mediated_fs(dir->dentry)) |
b5e95b48 JJ |
244 | return 0; |
245 | ||
246 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
247 | } | |
248 | ||
989f74e0 | 249 | static int apparmor_path_unlink(const struct path *dir, struct dentry *dentry) |
b5e95b48 JJ |
250 | { |
251 | return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE); | |
252 | } | |
253 | ||
d3607752 | 254 | static int apparmor_path_mkdir(const 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 | ||
989f74e0 | 261 | static int apparmor_path_rmdir(const struct path *dir, struct dentry *dentry) |
b5e95b48 JJ |
262 | { |
263 | return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE); | |
264 | } | |
265 | ||
d3607752 | 266 | static int apparmor_path_mknod(const 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 | ||
81f4c506 | 272 | static int apparmor_path_truncate(const struct path *path) |
b5e95b48 | 273 | { |
741aca71 | 274 | return common_perm_path(OP_TRUNC, path, MAY_WRITE | AA_MAY_META_WRITE); |
b5e95b48 JJ |
275 | } |
276 | ||
d3607752 | 277 | static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry, |
b5e95b48 JJ |
278 | const char *old_name) |
279 | { | |
280 | return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE, | |
281 | S_IFLNK); | |
282 | } | |
283 | ||
3ccee46a | 284 | static int apparmor_path_link(struct dentry *old_dentry, const struct path *new_dir, |
b5e95b48 JJ |
285 | struct dentry *new_dentry) |
286 | { | |
287 | struct aa_profile *profile; | |
288 | int error = 0; | |
289 | ||
efeee83a | 290 | if (!path_mediated_fs(old_dentry)) |
b5e95b48 JJ |
291 | return 0; |
292 | ||
293 | profile = aa_current_profile(); | |
294 | if (!unconfined(profile)) | |
295 | error = aa_path_link(profile, old_dentry, new_dir, new_dentry); | |
296 | return error; | |
297 | } | |
298 | ||
3ccee46a AV |
299 | static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry, |
300 | const struct path *new_dir, struct dentry *new_dentry) | |
b5e95b48 JJ |
301 | { |
302 | struct aa_profile *profile; | |
303 | int error = 0; | |
304 | ||
efeee83a | 305 | if (!path_mediated_fs(old_dentry)) |
b5e95b48 JJ |
306 | return 0; |
307 | ||
308 | profile = aa_current_profile(); | |
309 | if (!unconfined(profile)) { | |
8486adf0 KC |
310 | struct path old_path = { .mnt = old_dir->mnt, |
311 | .dentry = old_dentry }; | |
312 | struct path new_path = { .mnt = new_dir->mnt, | |
313 | .dentry = new_dentry }; | |
c6f493d6 DH |
314 | struct path_cond cond = { d_backing_inode(old_dentry)->i_uid, |
315 | d_backing_inode(old_dentry)->i_mode | |
b5e95b48 JJ |
316 | }; |
317 | ||
318 | error = aa_path_perm(OP_RENAME_SRC, profile, &old_path, 0, | |
319 | MAY_READ | AA_MAY_META_READ | MAY_WRITE | | |
320 | AA_MAY_META_WRITE | AA_MAY_DELETE, | |
321 | &cond); | |
322 | if (!error) | |
323 | error = aa_path_perm(OP_RENAME_DEST, profile, &new_path, | |
324 | 0, MAY_WRITE | AA_MAY_META_WRITE | | |
325 | AA_MAY_CREATE, &cond); | |
326 | ||
327 | } | |
328 | return error; | |
329 | } | |
330 | ||
be01f9f2 | 331 | static int apparmor_path_chmod(const struct path *path, umode_t mode) |
b5e95b48 | 332 | { |
741aca71 | 333 | return common_perm_path(OP_CHMOD, path, AA_MAY_CHMOD); |
b5e95b48 JJ |
334 | } |
335 | ||
7fd25dac | 336 | static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid) |
b5e95b48 | 337 | { |
741aca71 | 338 | return common_perm_path(OP_CHOWN, path, AA_MAY_CHOWN); |
b5e95b48 JJ |
339 | } |
340 | ||
3f7036a0 | 341 | static int apparmor_inode_getattr(const struct path *path) |
b5e95b48 | 342 | { |
741aca71 | 343 | return common_perm_path(OP_GETATTR, path, AA_MAY_META_READ); |
b5e95b48 JJ |
344 | } |
345 | ||
83d49856 | 346 | static int apparmor_file_open(struct file *file, const struct cred *cred) |
b5e95b48 JJ |
347 | { |
348 | struct aa_file_cxt *fcxt = file->f_security; | |
349 | struct aa_profile *profile; | |
350 | int error = 0; | |
351 | ||
efeee83a | 352 | if (!path_mediated_fs(file->f_path.dentry)) |
b5e95b48 JJ |
353 | return 0; |
354 | ||
355 | /* If in exec, permission is handled by bprm hooks. | |
356 | * Cache permissions granted by the previous exec check, with | |
357 | * implicit read and executable mmap which are required to | |
358 | * actually execute the image. | |
359 | */ | |
360 | if (current->in_execve) { | |
361 | fcxt->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP; | |
362 | return 0; | |
363 | } | |
364 | ||
365 | profile = aa_cred_profile(cred); | |
366 | if (!unconfined(profile)) { | |
496ad9aa | 367 | struct inode *inode = file_inode(file); |
b5e95b48 JJ |
368 | struct path_cond cond = { inode->i_uid, inode->i_mode }; |
369 | ||
370 | error = aa_path_perm(OP_OPEN, profile, &file->f_path, 0, | |
371 | aa_map_file_to_perms(file), &cond); | |
372 | /* todo cache full allowed permissions set and state */ | |
373 | fcxt->allow = aa_map_file_to_perms(file); | |
374 | } | |
375 | ||
376 | return error; | |
377 | } | |
378 | ||
379 | static int apparmor_file_alloc_security(struct file *file) | |
380 | { | |
381 | /* freed by apparmor_file_free_security */ | |
382 | file->f_security = aa_alloc_file_context(GFP_KERNEL); | |
383 | if (!file->f_security) | |
384 | return -ENOMEM; | |
385 | return 0; | |
386 | ||
387 | } | |
388 | ||
389 | static void apparmor_file_free_security(struct file *file) | |
390 | { | |
391 | struct aa_file_cxt *cxt = file->f_security; | |
392 | ||
393 | aa_free_file_context(cxt); | |
394 | } | |
395 | ||
396 | static int common_file_perm(int op, struct file *file, u32 mask) | |
397 | { | |
398 | struct aa_file_cxt *fcxt = file->f_security; | |
399 | struct aa_profile *profile, *fprofile = aa_cred_profile(file->f_cred); | |
400 | int error = 0; | |
401 | ||
402 | BUG_ON(!fprofile); | |
403 | ||
404 | if (!file->f_path.mnt || | |
efeee83a | 405 | !path_mediated_fs(file->f_path.dentry)) |
b5e95b48 JJ |
406 | return 0; |
407 | ||
408 | profile = __aa_current_profile(); | |
409 | ||
410 | /* revalidate access, if task is unconfined, or the cached cred | |
411 | * doesn't match or if the request is for more permissions than | |
412 | * was granted. | |
413 | * | |
414 | * Note: the test for !unconfined(fprofile) is to handle file | |
415 | * delegation from unconfined tasks | |
416 | */ | |
417 | if (!unconfined(profile) && !unconfined(fprofile) && | |
418 | ((fprofile != profile) || (mask & ~fcxt->allow))) | |
419 | error = aa_file_perm(op, profile, file, mask); | |
420 | ||
421 | return error; | |
422 | } | |
423 | ||
424 | static int apparmor_file_permission(struct file *file, int mask) | |
425 | { | |
426 | return common_file_perm(OP_FPERM, file, mask); | |
427 | } | |
428 | ||
429 | static int apparmor_file_lock(struct file *file, unsigned int cmd) | |
430 | { | |
431 | u32 mask = AA_MAY_LOCK; | |
432 | ||
433 | if (cmd == F_WRLCK) | |
434 | mask |= MAY_WRITE; | |
435 | ||
436 | return common_file_perm(OP_FLOCK, file, mask); | |
437 | } | |
438 | ||
439 | static int common_mmap(int op, struct file *file, unsigned long prot, | |
440 | unsigned long flags) | |
441 | { | |
b5e95b48 JJ |
442 | int mask = 0; |
443 | ||
444 | if (!file || !file->f_security) | |
445 | return 0; | |
446 | ||
447 | if (prot & PROT_READ) | |
448 | mask |= MAY_READ; | |
449 | /* | |
450 | * Private mappings don't require write perms since they don't | |
451 | * write back to the files | |
452 | */ | |
453 | if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE)) | |
454 | mask |= MAY_WRITE; | |
455 | if (prot & PROT_EXEC) | |
456 | mask |= AA_EXEC_MMAP; | |
457 | ||
b5e95b48 JJ |
458 | return common_file_perm(op, file, mask); |
459 | } | |
460 | ||
e5467859 AV |
461 | static int apparmor_mmap_file(struct file *file, unsigned long reqprot, |
462 | unsigned long prot, unsigned long flags) | |
b5e95b48 | 463 | { |
b5e95b48 JJ |
464 | return common_mmap(OP_FMMAP, file, prot, flags); |
465 | } | |
466 | ||
467 | static int apparmor_file_mprotect(struct vm_area_struct *vma, | |
468 | unsigned long reqprot, unsigned long prot) | |
469 | { | |
470 | return common_mmap(OP_FMPROT, vma->vm_file, prot, | |
471 | !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0); | |
472 | } | |
473 | ||
474 | static int apparmor_getprocattr(struct task_struct *task, char *name, | |
475 | char **value) | |
476 | { | |
477 | int error = -ENOENT; | |
b5e95b48 JJ |
478 | /* released below */ |
479 | const struct cred *cred = get_task_cred(task); | |
214beaca | 480 | struct aa_task_cxt *cxt = cred_cxt(cred); |
77b071b3 | 481 | struct aa_profile *profile = NULL; |
b5e95b48 JJ |
482 | |
483 | if (strcmp(name, "current") == 0) | |
77b071b3 | 484 | profile = aa_get_newest_profile(cxt->profile); |
b5e95b48 | 485 | else if (strcmp(name, "prev") == 0 && cxt->previous) |
77b071b3 | 486 | profile = aa_get_newest_profile(cxt->previous); |
b5e95b48 | 487 | else if (strcmp(name, "exec") == 0 && cxt->onexec) |
77b071b3 | 488 | profile = aa_get_newest_profile(cxt->onexec); |
b5e95b48 JJ |
489 | else |
490 | error = -EINVAL; | |
491 | ||
77b071b3 JJ |
492 | if (profile) |
493 | error = aa_getprocattr(profile, value); | |
494 | ||
495 | aa_put_profile(profile); | |
b5e95b48 JJ |
496 | put_cred(cred); |
497 | ||
498 | return error; | |
499 | } | |
500 | ||
501 | static int apparmor_setprocattr(struct task_struct *task, char *name, | |
502 | void *value, size_t size) | |
503 | { | |
3eea57c2 JJ |
504 | struct common_audit_data sa; |
505 | struct apparmor_audit_data aad = {0,}; | |
e89b8081 | 506 | char *command, *largs = NULL, *args = value; |
b5e95b48 JJ |
507 | size_t arg_size; |
508 | int error; | |
509 | ||
510 | if (size == 0) | |
511 | return -EINVAL; | |
b5e95b48 JJ |
512 | /* task can only write its own attributes */ |
513 | if (current != task) | |
514 | return -EACCES; | |
515 | ||
e89b8081 VN |
516 | /* AppArmor requires that the buffer must be null terminated atm */ |
517 | if (args[size - 1] != '\0') { | |
518 | /* null terminate */ | |
519 | largs = args = kmalloc(size + 1, GFP_KERNEL); | |
520 | if (!args) | |
521 | return -ENOMEM; | |
522 | memcpy(args, value, size); | |
523 | args[size] = '\0'; | |
524 | } | |
525 | ||
526 | error = -EINVAL; | |
b5e95b48 JJ |
527 | args = strim(args); |
528 | command = strsep(&args, " "); | |
529 | if (!args) | |
e89b8081 | 530 | goto out; |
b5e95b48 JJ |
531 | args = skip_spaces(args); |
532 | if (!*args) | |
e89b8081 | 533 | goto out; |
b5e95b48 | 534 | |
d4d03f74 | 535 | arg_size = size - (args - (largs ? largs : (char *) value)); |
b5e95b48 JJ |
536 | if (strcmp(name, "current") == 0) { |
537 | if (strcmp(command, "changehat") == 0) { | |
538 | error = aa_setprocattr_changehat(args, arg_size, | |
539 | !AA_DO_TEST); | |
540 | } else if (strcmp(command, "permhat") == 0) { | |
541 | error = aa_setprocattr_changehat(args, arg_size, | |
542 | AA_DO_TEST); | |
543 | } else if (strcmp(command, "changeprofile") == 0) { | |
544 | error = aa_setprocattr_changeprofile(args, !AA_ONEXEC, | |
545 | !AA_DO_TEST); | |
546 | } else if (strcmp(command, "permprofile") == 0) { | |
547 | error = aa_setprocattr_changeprofile(args, !AA_ONEXEC, | |
548 | AA_DO_TEST); | |
3eea57c2 JJ |
549 | } else |
550 | goto fail; | |
b5e95b48 | 551 | } else if (strcmp(name, "exec") == 0) { |
3eea57c2 JJ |
552 | if (strcmp(command, "exec") == 0) |
553 | error = aa_setprocattr_changeprofile(args, AA_ONEXEC, | |
554 | !AA_DO_TEST); | |
555 | else | |
556 | goto fail; | |
557 | } else | |
b5e95b48 | 558 | /* only support the "current" and "exec" process attributes */ |
e89b8081 | 559 | goto fail; |
3eea57c2 | 560 | |
b5e95b48 JJ |
561 | if (!error) |
562 | error = size; | |
e89b8081 VN |
563 | out: |
564 | kfree(largs); | |
b5e95b48 | 565 | return error; |
3eea57c2 JJ |
566 | |
567 | fail: | |
568 | sa.type = LSM_AUDIT_DATA_NONE; | |
569 | sa.aad = &aad; | |
570 | aad.profile = aa_current_profile(); | |
571 | aad.op = OP_SETPROCATTR; | |
572 | aad.info = name; | |
e89b8081 | 573 | aad.error = error = -EINVAL; |
3eea57c2 | 574 | aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL); |
e89b8081 | 575 | goto out; |
b5e95b48 JJ |
576 | } |
577 | ||
7cb4dc9f JS |
578 | static int apparmor_task_setrlimit(struct task_struct *task, |
579 | unsigned int resource, struct rlimit *new_rlim) | |
b5e95b48 | 580 | { |
1780f2d3 | 581 | struct aa_profile *profile = __aa_current_profile(); |
b5e95b48 JJ |
582 | int error = 0; |
583 | ||
584 | if (!unconfined(profile)) | |
3a2dc838 | 585 | error = aa_task_setrlimit(profile, task, resource, new_rlim); |
b5e95b48 JJ |
586 | |
587 | return error; | |
588 | } | |
589 | ||
b1d9e6b0 | 590 | static struct security_hook_list apparmor_hooks[] = { |
e20b043a CS |
591 | LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check), |
592 | LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme), | |
593 | LSM_HOOK_INIT(capget, apparmor_capget), | |
594 | LSM_HOOK_INIT(capable, apparmor_capable), | |
595 | ||
596 | LSM_HOOK_INIT(path_link, apparmor_path_link), | |
597 | LSM_HOOK_INIT(path_unlink, apparmor_path_unlink), | |
598 | LSM_HOOK_INIT(path_symlink, apparmor_path_symlink), | |
599 | LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir), | |
600 | LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir), | |
601 | LSM_HOOK_INIT(path_mknod, apparmor_path_mknod), | |
602 | LSM_HOOK_INIT(path_rename, apparmor_path_rename), | |
603 | LSM_HOOK_INIT(path_chmod, apparmor_path_chmod), | |
604 | LSM_HOOK_INIT(path_chown, apparmor_path_chown), | |
605 | LSM_HOOK_INIT(path_truncate, apparmor_path_truncate), | |
606 | LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr), | |
607 | ||
608 | LSM_HOOK_INIT(file_open, apparmor_file_open), | |
609 | LSM_HOOK_INIT(file_permission, apparmor_file_permission), | |
610 | LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security), | |
611 | LSM_HOOK_INIT(file_free_security, apparmor_file_free_security), | |
612 | LSM_HOOK_INIT(mmap_file, apparmor_mmap_file), | |
e20b043a CS |
613 | LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect), |
614 | LSM_HOOK_INIT(file_lock, apparmor_file_lock), | |
615 | ||
616 | LSM_HOOK_INIT(getprocattr, apparmor_getprocattr), | |
617 | LSM_HOOK_INIT(setprocattr, apparmor_setprocattr), | |
618 | ||
619 | LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank), | |
620 | LSM_HOOK_INIT(cred_free, apparmor_cred_free), | |
621 | LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare), | |
622 | LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer), | |
623 | ||
624 | LSM_HOOK_INIT(bprm_set_creds, apparmor_bprm_set_creds), | |
625 | LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds), | |
626 | LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds), | |
627 | LSM_HOOK_INIT(bprm_secureexec, apparmor_bprm_secureexec), | |
628 | ||
629 | LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit), | |
b5e95b48 JJ |
630 | }; |
631 | ||
632 | /* | |
633 | * AppArmor sysfs module parameters | |
634 | */ | |
635 | ||
101d6c82 SR |
636 | static int param_set_aabool(const char *val, const struct kernel_param *kp); |
637 | static int param_get_aabool(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 638 | #define param_check_aabool param_check_bool |
9c27847d | 639 | static const struct kernel_param_ops param_ops_aabool = { |
6a4c2643 | 640 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
641 | .set = param_set_aabool, |
642 | .get = param_get_aabool | |
643 | }; | |
b5e95b48 | 644 | |
101d6c82 SR |
645 | static int param_set_aauint(const char *val, const struct kernel_param *kp); |
646 | static int param_get_aauint(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 647 | #define param_check_aauint param_check_uint |
9c27847d | 648 | static const struct kernel_param_ops param_ops_aauint = { |
101d6c82 SR |
649 | .set = param_set_aauint, |
650 | .get = param_get_aauint | |
651 | }; | |
b5e95b48 | 652 | |
101d6c82 SR |
653 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp); |
654 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 655 | #define param_check_aalockpolicy param_check_bool |
9c27847d | 656 | static const struct kernel_param_ops param_ops_aalockpolicy = { |
6a4c2643 | 657 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
658 | .set = param_set_aalockpolicy, |
659 | .get = param_get_aalockpolicy | |
660 | }; | |
b5e95b48 JJ |
661 | |
662 | static int param_set_audit(const char *val, struct kernel_param *kp); | |
663 | static int param_get_audit(char *buffer, struct kernel_param *kp); | |
b5e95b48 JJ |
664 | |
665 | static int param_set_mode(const char *val, struct kernel_param *kp); | |
666 | static int param_get_mode(char *buffer, struct kernel_param *kp); | |
b5e95b48 JJ |
667 | |
668 | /* Flag values, also controllable via /sys/module/apparmor/parameters | |
669 | * We define special types as we want to do additional mediation. | |
670 | */ | |
671 | ||
672 | /* AppArmor global enforcement switch - complain, enforce, kill */ | |
673 | enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE; | |
674 | module_param_call(mode, param_set_mode, param_get_mode, | |
675 | &aa_g_profile_mode, S_IRUSR | S_IWUSR); | |
676 | ||
7616ac70 | 677 | #ifdef CONFIG_SECURITY_APPARMOR_HASH |
6059f71f | 678 | /* whether policy verification hashing is enabled */ |
7616ac70 | 679 | bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT); |
6059f71f | 680 | module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR); |
7616ac70 | 681 | #endif |
6059f71f | 682 | |
b5e95b48 | 683 | /* Debug mode */ |
680cd62e | 684 | bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_DEBUG_MESSAGES); |
b5e95b48 JJ |
685 | module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR); |
686 | ||
687 | /* Audit mode */ | |
688 | enum audit_mode aa_g_audit; | |
689 | module_param_call(audit, param_set_audit, param_get_audit, | |
690 | &aa_g_audit, S_IRUSR | S_IWUSR); | |
691 | ||
692 | /* Determines if audit header is included in audited messages. This | |
693 | * provides more context if the audit daemon is not running | |
694 | */ | |
90ab5ee9 | 695 | bool aa_g_audit_header = 1; |
b5e95b48 JJ |
696 | module_param_named(audit_header, aa_g_audit_header, aabool, |
697 | S_IRUSR | S_IWUSR); | |
698 | ||
699 | /* lock out loading/removal of policy | |
700 | * TODO: add in at boot loading of policy, which is the only way to | |
701 | * load policy, if lock_policy is set | |
702 | */ | |
90ab5ee9 | 703 | bool aa_g_lock_policy; |
b5e95b48 JJ |
704 | module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy, |
705 | S_IRUSR | S_IWUSR); | |
706 | ||
707 | /* Syscall logging mode */ | |
90ab5ee9 | 708 | bool aa_g_logsyscall; |
b5e95b48 JJ |
709 | module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR); |
710 | ||
711 | /* Maximum pathname length before accesses will start getting rejected */ | |
712 | unsigned int aa_g_path_max = 2 * PATH_MAX; | |
713 | module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR | S_IWUSR); | |
714 | ||
715 | /* Determines how paranoid loading of policy is and how much verification | |
716 | * on the loaded policy is done. | |
abbf8734 JJ |
717 | * DEPRECATED: read only as strict checking of load is always done now |
718 | * that none root users (user namespaces) can load policy. | |
b5e95b48 | 719 | */ |
90ab5ee9 | 720 | bool aa_g_paranoid_load = 1; |
abbf8734 | 721 | module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO); |
b5e95b48 JJ |
722 | |
723 | /* Boot time disable flag */ | |
90ab5ee9 | 724 | static bool apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE; |
c611616c | 725 | module_param_named(enabled, apparmor_enabled, bool, S_IRUGO); |
b5e95b48 JJ |
726 | |
727 | static int __init apparmor_enabled_setup(char *str) | |
728 | { | |
729 | unsigned long enabled; | |
29707b20 | 730 | int error = kstrtoul(str, 0, &enabled); |
b5e95b48 JJ |
731 | if (!error) |
732 | apparmor_enabled = enabled ? 1 : 0; | |
733 | return 1; | |
734 | } | |
735 | ||
736 | __setup("apparmor=", apparmor_enabled_setup); | |
737 | ||
738 | /* set global flag turning off the ability to load policy */ | |
101d6c82 | 739 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp) |
b5e95b48 | 740 | { |
58acf9d9 | 741 | if (!policy_admin_capable()) |
b5e95b48 | 742 | return -EPERM; |
b5e95b48 JJ |
743 | return param_set_bool(val, kp); |
744 | } | |
745 | ||
101d6c82 | 746 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 747 | { |
58acf9d9 | 748 | if (!policy_view_capable()) |
b5e95b48 JJ |
749 | return -EPERM; |
750 | return param_get_bool(buffer, kp); | |
751 | } | |
752 | ||
101d6c82 | 753 | static int param_set_aabool(const char *val, const struct kernel_param *kp) |
b5e95b48 | 754 | { |
58acf9d9 | 755 | if (!policy_admin_capable()) |
b5e95b48 JJ |
756 | return -EPERM; |
757 | return param_set_bool(val, kp); | |
758 | } | |
759 | ||
101d6c82 | 760 | static int param_get_aabool(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 761 | { |
58acf9d9 | 762 | if (!policy_view_capable()) |
b5e95b48 JJ |
763 | return -EPERM; |
764 | return param_get_bool(buffer, kp); | |
765 | } | |
766 | ||
101d6c82 | 767 | static int param_set_aauint(const char *val, const struct kernel_param *kp) |
b5e95b48 | 768 | { |
58acf9d9 | 769 | if (!policy_admin_capable()) |
b5e95b48 JJ |
770 | return -EPERM; |
771 | return param_set_uint(val, kp); | |
772 | } | |
773 | ||
101d6c82 | 774 | static int param_get_aauint(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 775 | { |
58acf9d9 | 776 | if (!policy_view_capable()) |
b5e95b48 JJ |
777 | return -EPERM; |
778 | return param_get_uint(buffer, kp); | |
779 | } | |
780 | ||
781 | static int param_get_audit(char *buffer, struct kernel_param *kp) | |
782 | { | |
58acf9d9 | 783 | if (!policy_view_capable()) |
b5e95b48 JJ |
784 | return -EPERM; |
785 | ||
786 | if (!apparmor_enabled) | |
787 | return -EINVAL; | |
788 | ||
789 | return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]); | |
790 | } | |
791 | ||
792 | static int param_set_audit(const char *val, struct kernel_param *kp) | |
793 | { | |
794 | int i; | |
58acf9d9 | 795 | if (!policy_admin_capable()) |
b5e95b48 JJ |
796 | return -EPERM; |
797 | ||
798 | if (!apparmor_enabled) | |
799 | return -EINVAL; | |
800 | ||
801 | if (!val) | |
802 | return -EINVAL; | |
803 | ||
804 | for (i = 0; i < AUDIT_MAX_INDEX; i++) { | |
805 | if (strcmp(val, audit_mode_names[i]) == 0) { | |
806 | aa_g_audit = i; | |
807 | return 0; | |
808 | } | |
809 | } | |
810 | ||
811 | return -EINVAL; | |
812 | } | |
813 | ||
814 | static int param_get_mode(char *buffer, struct kernel_param *kp) | |
815 | { | |
58acf9d9 | 816 | if (!policy_admin_capable()) |
b5e95b48 JJ |
817 | return -EPERM; |
818 | ||
819 | if (!apparmor_enabled) | |
820 | return -EINVAL; | |
821 | ||
0d259f04 | 822 | return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]); |
b5e95b48 JJ |
823 | } |
824 | ||
825 | static int param_set_mode(const char *val, struct kernel_param *kp) | |
826 | { | |
827 | int i; | |
58acf9d9 | 828 | if (!policy_admin_capable()) |
b5e95b48 JJ |
829 | return -EPERM; |
830 | ||
831 | if (!apparmor_enabled) | |
832 | return -EINVAL; | |
833 | ||
834 | if (!val) | |
835 | return -EINVAL; | |
836 | ||
0d259f04 JJ |
837 | for (i = 0; i < APPARMOR_MODE_NAMES_MAX_INDEX; i++) { |
838 | if (strcmp(val, aa_profile_mode_names[i]) == 0) { | |
b5e95b48 JJ |
839 | aa_g_profile_mode = i; |
840 | return 0; | |
841 | } | |
842 | } | |
843 | ||
844 | return -EINVAL; | |
845 | } | |
846 | ||
847 | /* | |
848 | * AppArmor init functions | |
849 | */ | |
850 | ||
851 | /** | |
852 | * set_init_cxt - set a task context and profile on the first task. | |
853 | * | |
854 | * TODO: allow setting an alternate profile than unconfined | |
855 | */ | |
856 | static int __init set_init_cxt(void) | |
857 | { | |
858 | struct cred *cred = (struct cred *)current->real_cred; | |
859 | struct aa_task_cxt *cxt; | |
860 | ||
861 | cxt = aa_alloc_task_context(GFP_KERNEL); | |
862 | if (!cxt) | |
863 | return -ENOMEM; | |
864 | ||
865 | cxt->profile = aa_get_profile(root_ns->unconfined); | |
214beaca | 866 | cred_cxt(cred) = cxt; |
b5e95b48 JJ |
867 | |
868 | return 0; | |
869 | } | |
870 | ||
871 | static int __init apparmor_init(void) | |
872 | { | |
873 | int error; | |
874 | ||
b1d9e6b0 | 875 | if (!apparmor_enabled || !security_module_enable("apparmor")) { |
b5e95b48 JJ |
876 | aa_info_message("AppArmor disabled by boot time parameter"); |
877 | apparmor_enabled = 0; | |
878 | return 0; | |
879 | } | |
880 | ||
881 | error = aa_alloc_root_ns(); | |
882 | if (error) { | |
883 | AA_ERROR("Unable to allocate default profile namespace\n"); | |
884 | goto alloc_out; | |
885 | } | |
886 | ||
887 | error = set_init_cxt(); | |
888 | if (error) { | |
889 | AA_ERROR("Failed to set context on init task\n"); | |
b1d9e6b0 CS |
890 | aa_free_root_ns(); |
891 | goto alloc_out; | |
b5e95b48 | 892 | } |
b1d9e6b0 | 893 | security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks)); |
b5e95b48 JJ |
894 | |
895 | /* Report that AppArmor successfully initialized */ | |
896 | apparmor_initialized = 1; | |
897 | if (aa_g_profile_mode == APPARMOR_COMPLAIN) | |
898 | aa_info_message("AppArmor initialized: complain mode enabled"); | |
899 | else if (aa_g_profile_mode == APPARMOR_KILL) | |
900 | aa_info_message("AppArmor initialized: kill mode enabled"); | |
901 | else | |
902 | aa_info_message("AppArmor initialized"); | |
903 | ||
904 | return error; | |
905 | ||
b5e95b48 JJ |
906 | alloc_out: |
907 | aa_destroy_aafs(); | |
908 | ||
909 | apparmor_enabled = 0; | |
910 | return error; | |
b5e95b48 JJ |
911 | } |
912 | ||
913 | security_initcall(apparmor_init); |