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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 | /* | |
55a26ebf | 48 | * free the associated aa_task_ctx and put its profiles |
b5e95b48 JJ |
49 | */ |
50 | static void apparmor_cred_free(struct cred *cred) | |
51 | { | |
55a26ebf JJ |
52 | aa_free_task_context(cred_ctx(cred)); |
53 | cred_ctx(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 */ | |
55a26ebf JJ |
62 | struct aa_task_ctx *ctx = aa_alloc_task_context(gfp); |
63 | ||
64 | if (!ctx) | |
b5e95b48 JJ |
65 | return -ENOMEM; |
66 | ||
55a26ebf | 67 | cred_ctx(cred) = ctx; |
b5e95b48 JJ |
68 | return 0; |
69 | } | |
70 | ||
71 | /* | |
55a26ebf | 72 | * prepare new aa_task_ctx for modification by prepare_cred block |
b5e95b48 JJ |
73 | */ |
74 | static int apparmor_cred_prepare(struct cred *new, const struct cred *old, | |
75 | gfp_t gfp) | |
76 | { | |
77 | /* freed by apparmor_cred_free */ | |
55a26ebf JJ |
78 | struct aa_task_ctx *ctx = aa_alloc_task_context(gfp); |
79 | ||
80 | if (!ctx) | |
b5e95b48 JJ |
81 | return -ENOMEM; |
82 | ||
55a26ebf JJ |
83 | aa_dup_task_context(ctx, cred_ctx(old)); |
84 | cred_ctx(new) = ctx; | |
b5e95b48 JJ |
85 | return 0; |
86 | } | |
87 | ||
88 | /* | |
89 | * transfer the apparmor data to a blank set of creds | |
90 | */ | |
91 | static void apparmor_cred_transfer(struct cred *new, const struct cred *old) | |
92 | { | |
55a26ebf JJ |
93 | const struct aa_task_ctx *old_ctx = cred_ctx(old); |
94 | struct aa_task_ctx *new_ctx = cred_ctx(new); | |
b5e95b48 | 95 | |
55a26ebf | 96 | aa_dup_task_context(new_ctx, old_ctx); |
b5e95b48 JJ |
97 | } |
98 | ||
99 | static int apparmor_ptrace_access_check(struct task_struct *child, | |
100 | unsigned int mode) | |
101 | { | |
b5e95b48 JJ |
102 | return aa_ptrace(current, child, mode); |
103 | } | |
104 | ||
105 | static int apparmor_ptrace_traceme(struct task_struct *parent) | |
106 | { | |
b5e95b48 JJ |
107 | return aa_ptrace(parent, current, PTRACE_MODE_ATTACH); |
108 | } | |
109 | ||
110 | /* Derived from security/commoncap.c:cap_capget */ | |
111 | static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective, | |
112 | kernel_cap_t *inheritable, kernel_cap_t *permitted) | |
113 | { | |
114 | struct aa_profile *profile; | |
115 | const struct cred *cred; | |
116 | ||
117 | rcu_read_lock(); | |
118 | cred = __task_cred(target); | |
119 | profile = aa_cred_profile(cred); | |
120 | ||
b1d9e6b0 CS |
121 | /* |
122 | * cap_capget is stacked ahead of this and will | |
123 | * initialize effective and permitted. | |
124 | */ | |
25e75dff | 125 | if (!unconfined(profile) && !COMPLAIN_MODE(profile)) { |
b5e95b48 JJ |
126 | *effective = cap_intersect(*effective, profile->caps.allow); |
127 | *permitted = cap_intersect(*permitted, profile->caps.allow); | |
128 | } | |
129 | rcu_read_unlock(); | |
130 | ||
131 | return 0; | |
132 | } | |
133 | ||
6a9de491 EP |
134 | static int apparmor_capable(const struct cred *cred, struct user_namespace *ns, |
135 | int cap, int audit) | |
b5e95b48 JJ |
136 | { |
137 | struct aa_profile *profile; | |
b1d9e6b0 CS |
138 | int error = 0; |
139 | ||
140 | profile = aa_cred_profile(cred); | |
141 | if (!unconfined(profile)) | |
142 | error = aa_capable(profile, cap, audit); | |
b5e95b48 JJ |
143 | return error; |
144 | } | |
145 | ||
146 | /** | |
147 | * common_perm - basic common permission check wrapper fn for paths | |
148 | * @op: operation being checked | |
149 | * @path: path to check permission of (NOT NULL) | |
150 | * @mask: requested permissions mask | |
151 | * @cond: conditional info for the permission request (NOT NULL) | |
152 | * | |
153 | * Returns: %0 else error code if error or permission denied | |
154 | */ | |
47f6e5cc | 155 | static int common_perm(const char *op, const struct path *path, u32 mask, |
b5e95b48 JJ |
156 | struct path_cond *cond) |
157 | { | |
158 | struct aa_profile *profile; | |
159 | int error = 0; | |
160 | ||
161 | profile = __aa_current_profile(); | |
162 | if (!unconfined(profile)) | |
163 | error = aa_path_perm(op, profile, path, 0, mask, cond); | |
164 | ||
165 | return error; | |
166 | } | |
167 | ||
168 | /** | |
169 | * common_perm_dir_dentry - common permission wrapper when path is dir, dentry | |
170 | * @op: operation being checked | |
171 | * @dir: directory of the dentry (NOT NULL) | |
172 | * @dentry: dentry to check (NOT NULL) | |
173 | * @mask: requested permissions mask | |
174 | * @cond: conditional info for the permission request (NOT NULL) | |
175 | * | |
176 | * Returns: %0 else error code if error or permission denied | |
177 | */ | |
47f6e5cc | 178 | static int common_perm_dir_dentry(const char *op, const struct path *dir, |
b5e95b48 JJ |
179 | struct dentry *dentry, u32 mask, |
180 | struct path_cond *cond) | |
181 | { | |
8486adf0 | 182 | struct path path = { .mnt = dir->mnt, .dentry = dentry }; |
b5e95b48 JJ |
183 | |
184 | return common_perm(op, &path, mask, cond); | |
185 | } | |
186 | ||
187 | /** | |
741aca71 | 188 | * common_perm_path - common permission wrapper when mnt, dentry |
b5e95b48 | 189 | * @op: operation being checked |
741aca71 | 190 | * @path: location to check (NOT NULL) |
b5e95b48 JJ |
191 | * @mask: requested permissions mask |
192 | * | |
193 | * Returns: %0 else error code if error or permission denied | |
194 | */ | |
47f6e5cc JJ |
195 | static inline int common_perm_path(const char *op, const struct path *path, |
196 | u32 mask) | |
b5e95b48 | 197 | { |
741aca71 AV |
198 | struct path_cond cond = { d_backing_inode(path->dentry)->i_uid, |
199 | d_backing_inode(path->dentry)->i_mode | |
b5e95b48 | 200 | }; |
efeee83a | 201 | if (!path_mediated_fs(path->dentry)) |
741aca71 | 202 | return 0; |
b5e95b48 | 203 | |
741aca71 | 204 | return common_perm(op, path, mask, &cond); |
b5e95b48 JJ |
205 | } |
206 | ||
207 | /** | |
208 | * common_perm_rm - common permission wrapper for operations doing rm | |
209 | * @op: operation being checked | |
210 | * @dir: directory that the dentry is in (NOT NULL) | |
211 | * @dentry: dentry being rm'd (NOT NULL) | |
212 | * @mask: requested permission mask | |
213 | * | |
214 | * Returns: %0 else error code if error or permission denied | |
215 | */ | |
47f6e5cc | 216 | static int common_perm_rm(const char *op, const struct path *dir, |
b5e95b48 JJ |
217 | struct dentry *dentry, u32 mask) |
218 | { | |
c6f493d6 | 219 | struct inode *inode = d_backing_inode(dentry); |
b5e95b48 JJ |
220 | struct path_cond cond = { }; |
221 | ||
efeee83a | 222 | if (!inode || !path_mediated_fs(dentry)) |
b5e95b48 JJ |
223 | return 0; |
224 | ||
225 | cond.uid = inode->i_uid; | |
226 | cond.mode = inode->i_mode; | |
227 | ||
228 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
229 | } | |
230 | ||
231 | /** | |
232 | * common_perm_create - common permission wrapper for operations doing create | |
233 | * @op: operation being checked | |
234 | * @dir: directory that dentry will be created in (NOT NULL) | |
235 | * @dentry: dentry to create (NOT NULL) | |
236 | * @mask: request permission mask | |
237 | * @mode: created file mode | |
238 | * | |
239 | * Returns: %0 else error code if error or permission denied | |
240 | */ | |
47f6e5cc | 241 | static int common_perm_create(const char *op, const struct path *dir, |
d6b49f7a | 242 | struct dentry *dentry, u32 mask, umode_t mode) |
b5e95b48 JJ |
243 | { |
244 | struct path_cond cond = { current_fsuid(), mode }; | |
245 | ||
efeee83a | 246 | if (!path_mediated_fs(dir->dentry)) |
b5e95b48 JJ |
247 | return 0; |
248 | ||
249 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
250 | } | |
251 | ||
989f74e0 | 252 | static int apparmor_path_unlink(const struct path *dir, struct dentry *dentry) |
b5e95b48 JJ |
253 | { |
254 | return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE); | |
255 | } | |
256 | ||
d3607752 | 257 | static int apparmor_path_mkdir(const struct path *dir, struct dentry *dentry, |
4572befe | 258 | umode_t mode) |
b5e95b48 JJ |
259 | { |
260 | return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE, | |
261 | S_IFDIR); | |
262 | } | |
263 | ||
989f74e0 | 264 | static int apparmor_path_rmdir(const struct path *dir, struct dentry *dentry) |
b5e95b48 JJ |
265 | { |
266 | return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE); | |
267 | } | |
268 | ||
d3607752 | 269 | static int apparmor_path_mknod(const struct path *dir, struct dentry *dentry, |
04fc66e7 | 270 | umode_t mode, unsigned int dev) |
b5e95b48 JJ |
271 | { |
272 | return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode); | |
273 | } | |
274 | ||
81f4c506 | 275 | static int apparmor_path_truncate(const struct path *path) |
b5e95b48 | 276 | { |
741aca71 | 277 | return common_perm_path(OP_TRUNC, path, MAY_WRITE | AA_MAY_META_WRITE); |
b5e95b48 JJ |
278 | } |
279 | ||
d3607752 | 280 | static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry, |
b5e95b48 JJ |
281 | const char *old_name) |
282 | { | |
283 | return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE, | |
284 | S_IFLNK); | |
285 | } | |
286 | ||
3ccee46a | 287 | static int apparmor_path_link(struct dentry *old_dentry, const struct path *new_dir, |
b5e95b48 JJ |
288 | struct dentry *new_dentry) |
289 | { | |
290 | struct aa_profile *profile; | |
291 | int error = 0; | |
292 | ||
efeee83a | 293 | if (!path_mediated_fs(old_dentry)) |
b5e95b48 JJ |
294 | return 0; |
295 | ||
296 | profile = aa_current_profile(); | |
297 | if (!unconfined(profile)) | |
298 | error = aa_path_link(profile, old_dentry, new_dir, new_dentry); | |
299 | return error; | |
300 | } | |
301 | ||
3ccee46a AV |
302 | static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry, |
303 | const struct path *new_dir, struct dentry *new_dentry) | |
b5e95b48 JJ |
304 | { |
305 | struct aa_profile *profile; | |
306 | int error = 0; | |
307 | ||
efeee83a | 308 | if (!path_mediated_fs(old_dentry)) |
b5e95b48 JJ |
309 | return 0; |
310 | ||
311 | profile = aa_current_profile(); | |
312 | if (!unconfined(profile)) { | |
8486adf0 KC |
313 | struct path old_path = { .mnt = old_dir->mnt, |
314 | .dentry = old_dentry }; | |
315 | struct path new_path = { .mnt = new_dir->mnt, | |
316 | .dentry = new_dentry }; | |
c6f493d6 DH |
317 | struct path_cond cond = { d_backing_inode(old_dentry)->i_uid, |
318 | d_backing_inode(old_dentry)->i_mode | |
b5e95b48 JJ |
319 | }; |
320 | ||
321 | error = aa_path_perm(OP_RENAME_SRC, profile, &old_path, 0, | |
322 | MAY_READ | AA_MAY_META_READ | MAY_WRITE | | |
323 | AA_MAY_META_WRITE | AA_MAY_DELETE, | |
324 | &cond); | |
325 | if (!error) | |
326 | error = aa_path_perm(OP_RENAME_DEST, profile, &new_path, | |
327 | 0, MAY_WRITE | AA_MAY_META_WRITE | | |
328 | AA_MAY_CREATE, &cond); | |
329 | ||
330 | } | |
331 | return error; | |
332 | } | |
333 | ||
be01f9f2 | 334 | static int apparmor_path_chmod(const struct path *path, umode_t mode) |
b5e95b48 | 335 | { |
741aca71 | 336 | return common_perm_path(OP_CHMOD, path, AA_MAY_CHMOD); |
b5e95b48 JJ |
337 | } |
338 | ||
7fd25dac | 339 | static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid) |
b5e95b48 | 340 | { |
741aca71 | 341 | return common_perm_path(OP_CHOWN, path, AA_MAY_CHOWN); |
b5e95b48 JJ |
342 | } |
343 | ||
3f7036a0 | 344 | static int apparmor_inode_getattr(const struct path *path) |
b5e95b48 | 345 | { |
741aca71 | 346 | return common_perm_path(OP_GETATTR, path, AA_MAY_META_READ); |
b5e95b48 JJ |
347 | } |
348 | ||
83d49856 | 349 | static int apparmor_file_open(struct file *file, const struct cred *cred) |
b5e95b48 | 350 | { |
55a26ebf | 351 | struct aa_file_ctx *fctx = file->f_security; |
b5e95b48 JJ |
352 | struct aa_profile *profile; |
353 | int error = 0; | |
354 | ||
efeee83a | 355 | if (!path_mediated_fs(file->f_path.dentry)) |
b5e95b48 JJ |
356 | return 0; |
357 | ||
358 | /* If in exec, permission is handled by bprm hooks. | |
359 | * Cache permissions granted by the previous exec check, with | |
360 | * implicit read and executable mmap which are required to | |
361 | * actually execute the image. | |
362 | */ | |
363 | if (current->in_execve) { | |
55a26ebf | 364 | fctx->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP; |
b5e95b48 JJ |
365 | return 0; |
366 | } | |
367 | ||
368 | profile = aa_cred_profile(cred); | |
369 | if (!unconfined(profile)) { | |
496ad9aa | 370 | struct inode *inode = file_inode(file); |
b5e95b48 JJ |
371 | struct path_cond cond = { inode->i_uid, inode->i_mode }; |
372 | ||
373 | error = aa_path_perm(OP_OPEN, profile, &file->f_path, 0, | |
374 | aa_map_file_to_perms(file), &cond); | |
375 | /* todo cache full allowed permissions set and state */ | |
55a26ebf | 376 | fctx->allow = aa_map_file_to_perms(file); |
b5e95b48 JJ |
377 | } |
378 | ||
379 | return error; | |
380 | } | |
381 | ||
382 | static int apparmor_file_alloc_security(struct file *file) | |
383 | { | |
384 | /* freed by apparmor_file_free_security */ | |
385 | file->f_security = aa_alloc_file_context(GFP_KERNEL); | |
386 | if (!file->f_security) | |
387 | return -ENOMEM; | |
388 | return 0; | |
389 | ||
390 | } | |
391 | ||
392 | static void apparmor_file_free_security(struct file *file) | |
393 | { | |
55a26ebf | 394 | struct aa_file_ctx *ctx = file->f_security; |
b5e95b48 | 395 | |
55a26ebf | 396 | aa_free_file_context(ctx); |
b5e95b48 JJ |
397 | } |
398 | ||
47f6e5cc | 399 | static int common_file_perm(const char *op, struct file *file, u32 mask) |
b5e95b48 | 400 | { |
55a26ebf | 401 | struct aa_file_ctx *fctx = file->f_security; |
b5e95b48 JJ |
402 | struct aa_profile *profile, *fprofile = aa_cred_profile(file->f_cred); |
403 | int error = 0; | |
404 | ||
405 | BUG_ON(!fprofile); | |
406 | ||
407 | if (!file->f_path.mnt || | |
efeee83a | 408 | !path_mediated_fs(file->f_path.dentry)) |
b5e95b48 JJ |
409 | return 0; |
410 | ||
411 | profile = __aa_current_profile(); | |
412 | ||
413 | /* revalidate access, if task is unconfined, or the cached cred | |
414 | * doesn't match or if the request is for more permissions than | |
415 | * was granted. | |
416 | * | |
417 | * Note: the test for !unconfined(fprofile) is to handle file | |
418 | * delegation from unconfined tasks | |
419 | */ | |
420 | if (!unconfined(profile) && !unconfined(fprofile) && | |
55a26ebf | 421 | ((fprofile != profile) || (mask & ~fctx->allow))) |
b5e95b48 JJ |
422 | error = aa_file_perm(op, profile, file, mask); |
423 | ||
424 | return error; | |
425 | } | |
426 | ||
427 | static int apparmor_file_permission(struct file *file, int mask) | |
428 | { | |
429 | return common_file_perm(OP_FPERM, file, mask); | |
430 | } | |
431 | ||
432 | static int apparmor_file_lock(struct file *file, unsigned int cmd) | |
433 | { | |
434 | u32 mask = AA_MAY_LOCK; | |
435 | ||
436 | if (cmd == F_WRLCK) | |
437 | mask |= MAY_WRITE; | |
438 | ||
439 | return common_file_perm(OP_FLOCK, file, mask); | |
440 | } | |
441 | ||
47f6e5cc | 442 | static int common_mmap(const char *op, struct file *file, unsigned long prot, |
b5e95b48 JJ |
443 | unsigned long flags) |
444 | { | |
b5e95b48 JJ |
445 | int mask = 0; |
446 | ||
447 | if (!file || !file->f_security) | |
448 | return 0; | |
449 | ||
450 | if (prot & PROT_READ) | |
451 | mask |= MAY_READ; | |
452 | /* | |
453 | * Private mappings don't require write perms since they don't | |
454 | * write back to the files | |
455 | */ | |
456 | if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE)) | |
457 | mask |= MAY_WRITE; | |
458 | if (prot & PROT_EXEC) | |
459 | mask |= AA_EXEC_MMAP; | |
460 | ||
b5e95b48 JJ |
461 | return common_file_perm(op, file, mask); |
462 | } | |
463 | ||
e5467859 AV |
464 | static int apparmor_mmap_file(struct file *file, unsigned long reqprot, |
465 | unsigned long prot, unsigned long flags) | |
b5e95b48 | 466 | { |
b5e95b48 JJ |
467 | return common_mmap(OP_FMMAP, file, prot, flags); |
468 | } | |
469 | ||
470 | static int apparmor_file_mprotect(struct vm_area_struct *vma, | |
471 | unsigned long reqprot, unsigned long prot) | |
472 | { | |
473 | return common_mmap(OP_FMPROT, vma->vm_file, prot, | |
474 | !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0); | |
475 | } | |
476 | ||
477 | static int apparmor_getprocattr(struct task_struct *task, char *name, | |
478 | char **value) | |
479 | { | |
480 | int error = -ENOENT; | |
b5e95b48 JJ |
481 | /* released below */ |
482 | const struct cred *cred = get_task_cred(task); | |
55a26ebf | 483 | struct aa_task_ctx *ctx = cred_ctx(cred); |
77b071b3 | 484 | struct aa_profile *profile = NULL; |
b5e95b48 JJ |
485 | |
486 | if (strcmp(name, "current") == 0) | |
55a26ebf JJ |
487 | profile = aa_get_newest_profile(ctx->profile); |
488 | else if (strcmp(name, "prev") == 0 && ctx->previous) | |
489 | profile = aa_get_newest_profile(ctx->previous); | |
490 | else if (strcmp(name, "exec") == 0 && ctx->onexec) | |
491 | profile = aa_get_newest_profile(ctx->onexec); | |
b5e95b48 JJ |
492 | else |
493 | error = -EINVAL; | |
494 | ||
77b071b3 JJ |
495 | if (profile) |
496 | error = aa_getprocattr(profile, value); | |
497 | ||
498 | aa_put_profile(profile); | |
b5e95b48 JJ |
499 | put_cred(cred); |
500 | ||
501 | return error; | |
502 | } | |
503 | ||
504 | static int apparmor_setprocattr(struct task_struct *task, char *name, | |
505 | void *value, size_t size) | |
506 | { | |
3eea57c2 JJ |
507 | struct common_audit_data sa; |
508 | struct apparmor_audit_data aad = {0,}; | |
e89b8081 | 509 | char *command, *largs = NULL, *args = value; |
b5e95b48 JJ |
510 | size_t arg_size; |
511 | int error; | |
512 | ||
513 | if (size == 0) | |
514 | return -EINVAL; | |
b5e95b48 JJ |
515 | /* task can only write its own attributes */ |
516 | if (current != task) | |
517 | return -EACCES; | |
518 | ||
e89b8081 VN |
519 | /* AppArmor requires that the buffer must be null terminated atm */ |
520 | if (args[size - 1] != '\0') { | |
521 | /* null terminate */ | |
522 | largs = args = kmalloc(size + 1, GFP_KERNEL); | |
523 | if (!args) | |
524 | return -ENOMEM; | |
525 | memcpy(args, value, size); | |
526 | args[size] = '\0'; | |
527 | } | |
528 | ||
529 | error = -EINVAL; | |
b5e95b48 JJ |
530 | args = strim(args); |
531 | command = strsep(&args, " "); | |
532 | if (!args) | |
e89b8081 | 533 | goto out; |
b5e95b48 JJ |
534 | args = skip_spaces(args); |
535 | if (!*args) | |
e89b8081 | 536 | goto out; |
b5e95b48 | 537 | |
d4d03f74 | 538 | arg_size = size - (args - (largs ? largs : (char *) value)); |
b5e95b48 JJ |
539 | if (strcmp(name, "current") == 0) { |
540 | if (strcmp(command, "changehat") == 0) { | |
541 | error = aa_setprocattr_changehat(args, arg_size, | |
542 | !AA_DO_TEST); | |
543 | } else if (strcmp(command, "permhat") == 0) { | |
544 | error = aa_setprocattr_changehat(args, arg_size, | |
545 | AA_DO_TEST); | |
546 | } else if (strcmp(command, "changeprofile") == 0) { | |
547 | error = aa_setprocattr_changeprofile(args, !AA_ONEXEC, | |
548 | !AA_DO_TEST); | |
549 | } else if (strcmp(command, "permprofile") == 0) { | |
550 | error = aa_setprocattr_changeprofile(args, !AA_ONEXEC, | |
551 | AA_DO_TEST); | |
3eea57c2 JJ |
552 | } else |
553 | goto fail; | |
b5e95b48 | 554 | } else if (strcmp(name, "exec") == 0) { |
3eea57c2 JJ |
555 | if (strcmp(command, "exec") == 0) |
556 | error = aa_setprocattr_changeprofile(args, AA_ONEXEC, | |
557 | !AA_DO_TEST); | |
558 | else | |
559 | goto fail; | |
560 | } else | |
b5e95b48 | 561 | /* only support the "current" and "exec" process attributes */ |
e89b8081 | 562 | goto fail; |
3eea57c2 | 563 | |
b5e95b48 JJ |
564 | if (!error) |
565 | error = size; | |
e89b8081 VN |
566 | out: |
567 | kfree(largs); | |
b5e95b48 | 568 | return error; |
3eea57c2 JJ |
569 | |
570 | fail: | |
571 | sa.type = LSM_AUDIT_DATA_NONE; | |
572 | sa.aad = &aad; | |
573 | aad.profile = aa_current_profile(); | |
574 | aad.op = OP_SETPROCATTR; | |
575 | aad.info = name; | |
e89b8081 | 576 | aad.error = error = -EINVAL; |
3eea57c2 | 577 | aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL); |
e89b8081 | 578 | goto out; |
b5e95b48 JJ |
579 | } |
580 | ||
7cb4dc9f JS |
581 | static int apparmor_task_setrlimit(struct task_struct *task, |
582 | unsigned int resource, struct rlimit *new_rlim) | |
b5e95b48 | 583 | { |
1780f2d3 | 584 | struct aa_profile *profile = __aa_current_profile(); |
b5e95b48 JJ |
585 | int error = 0; |
586 | ||
587 | if (!unconfined(profile)) | |
3a2dc838 | 588 | error = aa_task_setrlimit(profile, task, resource, new_rlim); |
b5e95b48 JJ |
589 | |
590 | return error; | |
591 | } | |
592 | ||
b1d9e6b0 | 593 | static struct security_hook_list apparmor_hooks[] = { |
e20b043a CS |
594 | LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check), |
595 | LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme), | |
596 | LSM_HOOK_INIT(capget, apparmor_capget), | |
597 | LSM_HOOK_INIT(capable, apparmor_capable), | |
598 | ||
599 | LSM_HOOK_INIT(path_link, apparmor_path_link), | |
600 | LSM_HOOK_INIT(path_unlink, apparmor_path_unlink), | |
601 | LSM_HOOK_INIT(path_symlink, apparmor_path_symlink), | |
602 | LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir), | |
603 | LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir), | |
604 | LSM_HOOK_INIT(path_mknod, apparmor_path_mknod), | |
605 | LSM_HOOK_INIT(path_rename, apparmor_path_rename), | |
606 | LSM_HOOK_INIT(path_chmod, apparmor_path_chmod), | |
607 | LSM_HOOK_INIT(path_chown, apparmor_path_chown), | |
608 | LSM_HOOK_INIT(path_truncate, apparmor_path_truncate), | |
609 | LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr), | |
610 | ||
611 | LSM_HOOK_INIT(file_open, apparmor_file_open), | |
612 | LSM_HOOK_INIT(file_permission, apparmor_file_permission), | |
613 | LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security), | |
614 | LSM_HOOK_INIT(file_free_security, apparmor_file_free_security), | |
615 | LSM_HOOK_INIT(mmap_file, apparmor_mmap_file), | |
e20b043a CS |
616 | LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect), |
617 | LSM_HOOK_INIT(file_lock, apparmor_file_lock), | |
618 | ||
619 | LSM_HOOK_INIT(getprocattr, apparmor_getprocattr), | |
620 | LSM_HOOK_INIT(setprocattr, apparmor_setprocattr), | |
621 | ||
622 | LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank), | |
623 | LSM_HOOK_INIT(cred_free, apparmor_cred_free), | |
624 | LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare), | |
625 | LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer), | |
626 | ||
627 | LSM_HOOK_INIT(bprm_set_creds, apparmor_bprm_set_creds), | |
628 | LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds), | |
629 | LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds), | |
630 | LSM_HOOK_INIT(bprm_secureexec, apparmor_bprm_secureexec), | |
631 | ||
632 | LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit), | |
b5e95b48 JJ |
633 | }; |
634 | ||
635 | /* | |
636 | * AppArmor sysfs module parameters | |
637 | */ | |
638 | ||
101d6c82 SR |
639 | static int param_set_aabool(const char *val, const struct kernel_param *kp); |
640 | static int param_get_aabool(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 641 | #define param_check_aabool param_check_bool |
9c27847d | 642 | static const struct kernel_param_ops param_ops_aabool = { |
6a4c2643 | 643 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
644 | .set = param_set_aabool, |
645 | .get = param_get_aabool | |
646 | }; | |
b5e95b48 | 647 | |
101d6c82 SR |
648 | static int param_set_aauint(const char *val, const struct kernel_param *kp); |
649 | static int param_get_aauint(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 650 | #define param_check_aauint param_check_uint |
9c27847d | 651 | static const struct kernel_param_ops param_ops_aauint = { |
101d6c82 SR |
652 | .set = param_set_aauint, |
653 | .get = param_get_aauint | |
654 | }; | |
b5e95b48 | 655 | |
101d6c82 SR |
656 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp); |
657 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 658 | #define param_check_aalockpolicy param_check_bool |
9c27847d | 659 | static const struct kernel_param_ops param_ops_aalockpolicy = { |
6a4c2643 | 660 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
661 | .set = param_set_aalockpolicy, |
662 | .get = param_get_aalockpolicy | |
663 | }; | |
b5e95b48 JJ |
664 | |
665 | static int param_set_audit(const char *val, struct kernel_param *kp); | |
666 | static int param_get_audit(char *buffer, struct kernel_param *kp); | |
b5e95b48 JJ |
667 | |
668 | static int param_set_mode(const char *val, struct kernel_param *kp); | |
669 | static int param_get_mode(char *buffer, struct kernel_param *kp); | |
b5e95b48 JJ |
670 | |
671 | /* Flag values, also controllable via /sys/module/apparmor/parameters | |
672 | * We define special types as we want to do additional mediation. | |
673 | */ | |
674 | ||
675 | /* AppArmor global enforcement switch - complain, enforce, kill */ | |
676 | enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE; | |
677 | module_param_call(mode, param_set_mode, param_get_mode, | |
678 | &aa_g_profile_mode, S_IRUSR | S_IWUSR); | |
679 | ||
7616ac70 | 680 | #ifdef CONFIG_SECURITY_APPARMOR_HASH |
6059f71f | 681 | /* whether policy verification hashing is enabled */ |
7616ac70 | 682 | bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT); |
6059f71f | 683 | module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR); |
7616ac70 | 684 | #endif |
6059f71f | 685 | |
b5e95b48 | 686 | /* Debug mode */ |
680cd62e | 687 | bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_DEBUG_MESSAGES); |
b5e95b48 JJ |
688 | module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR); |
689 | ||
690 | /* Audit mode */ | |
691 | enum audit_mode aa_g_audit; | |
692 | module_param_call(audit, param_set_audit, param_get_audit, | |
693 | &aa_g_audit, S_IRUSR | S_IWUSR); | |
694 | ||
695 | /* Determines if audit header is included in audited messages. This | |
696 | * provides more context if the audit daemon is not running | |
697 | */ | |
90ab5ee9 | 698 | bool aa_g_audit_header = 1; |
b5e95b48 JJ |
699 | module_param_named(audit_header, aa_g_audit_header, aabool, |
700 | S_IRUSR | S_IWUSR); | |
701 | ||
702 | /* lock out loading/removal of policy | |
703 | * TODO: add in at boot loading of policy, which is the only way to | |
704 | * load policy, if lock_policy is set | |
705 | */ | |
90ab5ee9 | 706 | bool aa_g_lock_policy; |
b5e95b48 JJ |
707 | module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy, |
708 | S_IRUSR | S_IWUSR); | |
709 | ||
710 | /* Syscall logging mode */ | |
90ab5ee9 | 711 | bool aa_g_logsyscall; |
b5e95b48 JJ |
712 | module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR); |
713 | ||
714 | /* Maximum pathname length before accesses will start getting rejected */ | |
715 | unsigned int aa_g_path_max = 2 * PATH_MAX; | |
716 | module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR | S_IWUSR); | |
717 | ||
718 | /* Determines how paranoid loading of policy is and how much verification | |
719 | * on the loaded policy is done. | |
abbf8734 JJ |
720 | * DEPRECATED: read only as strict checking of load is always done now |
721 | * that none root users (user namespaces) can load policy. | |
b5e95b48 | 722 | */ |
90ab5ee9 | 723 | bool aa_g_paranoid_load = 1; |
abbf8734 | 724 | module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO); |
b5e95b48 JJ |
725 | |
726 | /* Boot time disable flag */ | |
90ab5ee9 | 727 | static bool apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE; |
c611616c | 728 | module_param_named(enabled, apparmor_enabled, bool, S_IRUGO); |
b5e95b48 JJ |
729 | |
730 | static int __init apparmor_enabled_setup(char *str) | |
731 | { | |
732 | unsigned long enabled; | |
29707b20 | 733 | int error = kstrtoul(str, 0, &enabled); |
b5e95b48 JJ |
734 | if (!error) |
735 | apparmor_enabled = enabled ? 1 : 0; | |
736 | return 1; | |
737 | } | |
738 | ||
739 | __setup("apparmor=", apparmor_enabled_setup); | |
740 | ||
741 | /* set global flag turning off the ability to load policy */ | |
101d6c82 | 742 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp) |
b5e95b48 | 743 | { |
fd2a8043 | 744 | if (!policy_admin_capable(NULL)) |
b5e95b48 | 745 | return -EPERM; |
b5e95b48 JJ |
746 | return param_set_bool(val, kp); |
747 | } | |
748 | ||
101d6c82 | 749 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 750 | { |
2bd8dbbf | 751 | if (!policy_view_capable(NULL)) |
b5e95b48 JJ |
752 | return -EPERM; |
753 | return param_get_bool(buffer, kp); | |
754 | } | |
755 | ||
101d6c82 | 756 | static int param_set_aabool(const char *val, const struct kernel_param *kp) |
b5e95b48 | 757 | { |
fd2a8043 | 758 | if (!policy_admin_capable(NULL)) |
b5e95b48 JJ |
759 | return -EPERM; |
760 | return param_set_bool(val, kp); | |
761 | } | |
762 | ||
101d6c82 | 763 | static int param_get_aabool(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 764 | { |
2bd8dbbf | 765 | if (!policy_view_capable(NULL)) |
b5e95b48 JJ |
766 | return -EPERM; |
767 | return param_get_bool(buffer, kp); | |
768 | } | |
769 | ||
101d6c82 | 770 | static int param_set_aauint(const char *val, const struct kernel_param *kp) |
b5e95b48 | 771 | { |
fd2a8043 | 772 | if (!policy_admin_capable(NULL)) |
b5e95b48 JJ |
773 | return -EPERM; |
774 | return param_set_uint(val, kp); | |
775 | } | |
776 | ||
101d6c82 | 777 | static int param_get_aauint(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 778 | { |
2bd8dbbf | 779 | if (!policy_view_capable(NULL)) |
b5e95b48 JJ |
780 | return -EPERM; |
781 | return param_get_uint(buffer, kp); | |
782 | } | |
783 | ||
784 | static int param_get_audit(char *buffer, struct kernel_param *kp) | |
785 | { | |
2bd8dbbf | 786 | if (!policy_view_capable(NULL)) |
b5e95b48 JJ |
787 | return -EPERM; |
788 | ||
789 | if (!apparmor_enabled) | |
790 | return -EINVAL; | |
791 | ||
792 | return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]); | |
793 | } | |
794 | ||
795 | static int param_set_audit(const char *val, struct kernel_param *kp) | |
796 | { | |
797 | int i; | |
fd2a8043 | 798 | if (!policy_admin_capable(NULL)) |
b5e95b48 JJ |
799 | return -EPERM; |
800 | ||
801 | if (!apparmor_enabled) | |
802 | return -EINVAL; | |
803 | ||
804 | if (!val) | |
805 | return -EINVAL; | |
806 | ||
807 | for (i = 0; i < AUDIT_MAX_INDEX; i++) { | |
808 | if (strcmp(val, audit_mode_names[i]) == 0) { | |
809 | aa_g_audit = i; | |
810 | return 0; | |
811 | } | |
812 | } | |
813 | ||
814 | return -EINVAL; | |
815 | } | |
816 | ||
817 | static int param_get_mode(char *buffer, struct kernel_param *kp) | |
818 | { | |
fd2a8043 | 819 | if (!policy_view_capable(NULL)) |
b5e95b48 JJ |
820 | return -EPERM; |
821 | ||
822 | if (!apparmor_enabled) | |
823 | return -EINVAL; | |
824 | ||
0d259f04 | 825 | return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]); |
b5e95b48 JJ |
826 | } |
827 | ||
828 | static int param_set_mode(const char *val, struct kernel_param *kp) | |
829 | { | |
830 | int i; | |
fd2a8043 | 831 | if (!policy_admin_capable(NULL)) |
b5e95b48 JJ |
832 | return -EPERM; |
833 | ||
834 | if (!apparmor_enabled) | |
835 | return -EINVAL; | |
836 | ||
837 | if (!val) | |
838 | return -EINVAL; | |
839 | ||
0d259f04 JJ |
840 | for (i = 0; i < APPARMOR_MODE_NAMES_MAX_INDEX; i++) { |
841 | if (strcmp(val, aa_profile_mode_names[i]) == 0) { | |
b5e95b48 JJ |
842 | aa_g_profile_mode = i; |
843 | return 0; | |
844 | } | |
845 | } | |
846 | ||
847 | return -EINVAL; | |
848 | } | |
849 | ||
850 | /* | |
851 | * AppArmor init functions | |
852 | */ | |
853 | ||
854 | /** | |
55a26ebf | 855 | * set_init_ctx - set a task context and profile on the first task. |
b5e95b48 JJ |
856 | * |
857 | * TODO: allow setting an alternate profile than unconfined | |
858 | */ | |
55a26ebf | 859 | static int __init set_init_ctx(void) |
b5e95b48 JJ |
860 | { |
861 | struct cred *cred = (struct cred *)current->real_cred; | |
55a26ebf | 862 | struct aa_task_ctx *ctx; |
b5e95b48 | 863 | |
55a26ebf JJ |
864 | ctx = aa_alloc_task_context(GFP_KERNEL); |
865 | if (!ctx) | |
b5e95b48 JJ |
866 | return -ENOMEM; |
867 | ||
55a26ebf JJ |
868 | ctx->profile = aa_get_profile(root_ns->unconfined); |
869 | cred_ctx(cred) = ctx; | |
b5e95b48 JJ |
870 | |
871 | return 0; | |
872 | } | |
873 | ||
874 | static int __init apparmor_init(void) | |
875 | { | |
876 | int error; | |
877 | ||
b1d9e6b0 | 878 | if (!apparmor_enabled || !security_module_enable("apparmor")) { |
b5e95b48 JJ |
879 | aa_info_message("AppArmor disabled by boot time parameter"); |
880 | apparmor_enabled = 0; | |
881 | return 0; | |
882 | } | |
883 | ||
11c236b8 JJ |
884 | error = aa_setup_dfa_engine(); |
885 | if (error) { | |
886 | AA_ERROR("Unable to setup dfa engine\n"); | |
887 | goto alloc_out; | |
888 | } | |
889 | ||
b5e95b48 JJ |
890 | error = aa_alloc_root_ns(); |
891 | if (error) { | |
892 | AA_ERROR("Unable to allocate default profile namespace\n"); | |
893 | goto alloc_out; | |
894 | } | |
895 | ||
55a26ebf | 896 | error = set_init_ctx(); |
b5e95b48 JJ |
897 | if (error) { |
898 | AA_ERROR("Failed to set context on init task\n"); | |
b1d9e6b0 CS |
899 | aa_free_root_ns(); |
900 | goto alloc_out; | |
b5e95b48 | 901 | } |
b1d9e6b0 | 902 | security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks)); |
b5e95b48 JJ |
903 | |
904 | /* Report that AppArmor successfully initialized */ | |
905 | apparmor_initialized = 1; | |
906 | if (aa_g_profile_mode == APPARMOR_COMPLAIN) | |
907 | aa_info_message("AppArmor initialized: complain mode enabled"); | |
908 | else if (aa_g_profile_mode == APPARMOR_KILL) | |
909 | aa_info_message("AppArmor initialized: kill mode enabled"); | |
910 | else | |
911 | aa_info_message("AppArmor initialized"); | |
912 | ||
913 | return error; | |
914 | ||
b5e95b48 JJ |
915 | alloc_out: |
916 | aa_destroy_aafs(); | |
11c236b8 | 917 | aa_teardown_dfa_engine(); |
b5e95b48 JJ |
918 | |
919 | apparmor_enabled = 0; | |
920 | return error; | |
b5e95b48 JJ |
921 | } |
922 | ||
923 | security_initcall(apparmor_init); |