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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" | |
d8889d49 | 32 | #include "include/cred.h" |
b5e95b48 JJ |
33 | #include "include/file.h" |
34 | #include "include/ipc.h" | |
56974a6f | 35 | #include "include/net.h" |
b5e95b48 | 36 | #include "include/path.h" |
637f688d | 37 | #include "include/label.h" |
b5e95b48 | 38 | #include "include/policy.h" |
cff281f6 | 39 | #include "include/policy_ns.h" |
b5e95b48 | 40 | #include "include/procattr.h" |
2ea3ffb7 | 41 | #include "include/mount.h" |
c0929212 | 42 | #include "include/secid.h" |
b5e95b48 JJ |
43 | |
44 | /* Flag indicating whether initialization completed */ | |
545de8fe | 45 | int apparmor_initialized; |
b5e95b48 | 46 | |
d4669f0b JJ |
47 | DEFINE_PER_CPU(struct aa_buffers, aa_buffers); |
48 | ||
49 | ||
b5e95b48 JJ |
50 | /* |
51 | * LSM hook functions | |
52 | */ | |
53 | ||
54 | /* | |
d9087c49 | 55 | * put the associated labels |
b5e95b48 JJ |
56 | */ |
57 | static void apparmor_cred_free(struct cred *cred) | |
58 | { | |
d9087c49 JJ |
59 | aa_put_label(cred_label(cred)); |
60 | cred_label(cred) = NULL; | |
b5e95b48 JJ |
61 | } |
62 | ||
63 | /* | |
64 | * allocate the apparmor part of blank credentials | |
65 | */ | |
66 | static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
67 | { | |
d9087c49 | 68 | cred_label(cred) = NULL; |
b5e95b48 JJ |
69 | return 0; |
70 | } | |
71 | ||
72 | /* | |
d9087c49 | 73 | * prepare new cred label for modification by prepare_cred block |
b5e95b48 JJ |
74 | */ |
75 | static int apparmor_cred_prepare(struct cred *new, const struct cred *old, | |
76 | gfp_t gfp) | |
77 | { | |
d9087c49 | 78 | cred_label(new) = aa_get_newest_label(cred_label(old)); |
b5e95b48 JJ |
79 | return 0; |
80 | } | |
81 | ||
82 | /* | |
83 | * transfer the apparmor data to a blank set of creds | |
84 | */ | |
85 | static void apparmor_cred_transfer(struct cred *new, const struct cred *old) | |
86 | { | |
d9087c49 | 87 | cred_label(new) = aa_get_newest_label(cred_label(old)); |
b5e95b48 JJ |
88 | } |
89 | ||
3b529a76 JJ |
90 | static void apparmor_task_free(struct task_struct *task) |
91 | { | |
92 | ||
93 | aa_free_task_ctx(task_ctx(task)); | |
94 | task_ctx(task) = NULL; | |
95 | } | |
96 | ||
97 | static int apparmor_task_alloc(struct task_struct *task, | |
98 | unsigned long clone_flags) | |
99 | { | |
100 | struct aa_task_ctx *new = aa_alloc_task_ctx(GFP_KERNEL); | |
101 | ||
102 | if (!new) | |
103 | return -ENOMEM; | |
104 | ||
de62de59 | 105 | aa_dup_task_ctx(new, task_ctx(current)); |
3b529a76 | 106 | task_ctx(task) = new; |
b5e95b48 | 107 | |
3b529a76 | 108 | return 0; |
b5e95b48 JJ |
109 | } |
110 | ||
111 | static int apparmor_ptrace_access_check(struct task_struct *child, | |
112 | unsigned int mode) | |
113 | { | |
b2d09ae4 JJ |
114 | struct aa_label *tracer, *tracee; |
115 | int error; | |
116 | ||
117 | tracer = begin_current_label_crit_section(); | |
118 | tracee = aa_get_task_label(child); | |
119 | error = aa_may_ptrace(tracer, tracee, | |
338d0be4 JJ |
120 | (mode & PTRACE_MODE_READ) ? AA_PTRACE_READ |
121 | : AA_PTRACE_TRACE); | |
b2d09ae4 JJ |
122 | aa_put_label(tracee); |
123 | end_current_label_crit_section(tracer); | |
124 | ||
125 | return error; | |
b5e95b48 JJ |
126 | } |
127 | ||
128 | static int apparmor_ptrace_traceme(struct task_struct *parent) | |
129 | { | |
b2d09ae4 JJ |
130 | struct aa_label *tracer, *tracee; |
131 | int error; | |
132 | ||
133 | tracee = begin_current_label_crit_section(); | |
134 | tracer = aa_get_task_label(parent); | |
135 | error = aa_may_ptrace(tracer, tracee, AA_PTRACE_TRACE); | |
136 | aa_put_label(tracer); | |
137 | end_current_label_crit_section(tracee); | |
138 | ||
139 | return error; | |
b5e95b48 JJ |
140 | } |
141 | ||
142 | /* Derived from security/commoncap.c:cap_capget */ | |
143 | static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective, | |
144 | kernel_cap_t *inheritable, kernel_cap_t *permitted) | |
145 | { | |
637f688d | 146 | struct aa_label *label; |
b5e95b48 JJ |
147 | const struct cred *cred; |
148 | ||
149 | rcu_read_lock(); | |
150 | cred = __task_cred(target); | |
637f688d | 151 | label = aa_get_newest_cred_label(cred); |
c70c86c4 | 152 | |
b1d9e6b0 CS |
153 | /* |
154 | * cap_capget is stacked ahead of this and will | |
155 | * initialize effective and permitted. | |
156 | */ | |
c70c86c4 JJ |
157 | if (!unconfined(label)) { |
158 | struct aa_profile *profile; | |
159 | struct label_it i; | |
160 | ||
161 | label_for_each_confined(i, label, profile) { | |
162 | if (COMPLAIN_MODE(profile)) | |
163 | continue; | |
164 | *effective = cap_intersect(*effective, | |
165 | profile->caps.allow); | |
166 | *permitted = cap_intersect(*permitted, | |
167 | profile->caps.allow); | |
168 | } | |
b5e95b48 JJ |
169 | } |
170 | rcu_read_unlock(); | |
637f688d | 171 | aa_put_label(label); |
b5e95b48 JJ |
172 | |
173 | return 0; | |
174 | } | |
175 | ||
6a9de491 EP |
176 | static int apparmor_capable(const struct cred *cred, struct user_namespace *ns, |
177 | int cap, int audit) | |
b5e95b48 | 178 | { |
637f688d | 179 | struct aa_label *label; |
b1d9e6b0 CS |
180 | int error = 0; |
181 | ||
637f688d JJ |
182 | label = aa_get_newest_cred_label(cred); |
183 | if (!unconfined(label)) | |
c70c86c4 | 184 | error = aa_capable(label, cap, audit); |
637f688d | 185 | aa_put_label(label); |
cf797c0e | 186 | |
b5e95b48 JJ |
187 | return error; |
188 | } | |
189 | ||
190 | /** | |
191 | * common_perm - basic common permission check wrapper fn for paths | |
192 | * @op: operation being checked | |
193 | * @path: path to check permission of (NOT NULL) | |
194 | * @mask: requested permissions mask | |
195 | * @cond: conditional info for the permission request (NOT NULL) | |
196 | * | |
197 | * Returns: %0 else error code if error or permission denied | |
198 | */ | |
47f6e5cc | 199 | static int common_perm(const char *op, const struct path *path, u32 mask, |
b5e95b48 JJ |
200 | struct path_cond *cond) |
201 | { | |
637f688d | 202 | struct aa_label *label; |
b5e95b48 JJ |
203 | int error = 0; |
204 | ||
637f688d JJ |
205 | label = __begin_current_label_crit_section(); |
206 | if (!unconfined(label)) | |
aebd873e | 207 | error = aa_path_perm(op, label, path, 0, mask, cond); |
637f688d | 208 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
209 | |
210 | return error; | |
211 | } | |
212 | ||
213 | /** | |
31f75bfe | 214 | * common_perm_cond - common permission wrapper around inode cond |
b5e95b48 | 215 | * @op: operation being checked |
31f75bfe | 216 | * @path: location to check (NOT NULL) |
b5e95b48 | 217 | * @mask: requested permissions mask |
b5e95b48 JJ |
218 | * |
219 | * Returns: %0 else error code if error or permission denied | |
220 | */ | |
31f75bfe | 221 | static int common_perm_cond(const char *op, const struct path *path, u32 mask) |
b5e95b48 | 222 | { |
31f75bfe JJ |
223 | struct path_cond cond = { d_backing_inode(path->dentry)->i_uid, |
224 | d_backing_inode(path->dentry)->i_mode | |
225 | }; | |
b5e95b48 | 226 | |
31f75bfe JJ |
227 | if (!path_mediated_fs(path->dentry)) |
228 | return 0; | |
229 | ||
230 | return common_perm(op, path, mask, &cond); | |
b5e95b48 JJ |
231 | } |
232 | ||
233 | /** | |
31f75bfe | 234 | * common_perm_dir_dentry - common permission wrapper when path is dir, dentry |
b5e95b48 | 235 | * @op: operation being checked |
31f75bfe JJ |
236 | * @dir: directory of the dentry (NOT NULL) |
237 | * @dentry: dentry to check (NOT NULL) | |
b5e95b48 | 238 | * @mask: requested permissions mask |
31f75bfe | 239 | * @cond: conditional info for the permission request (NOT NULL) |
b5e95b48 JJ |
240 | * |
241 | * Returns: %0 else error code if error or permission denied | |
242 | */ | |
31f75bfe JJ |
243 | static int common_perm_dir_dentry(const char *op, const struct path *dir, |
244 | struct dentry *dentry, u32 mask, | |
245 | struct path_cond *cond) | |
b5e95b48 | 246 | { |
31f75bfe | 247 | struct path path = { .mnt = dir->mnt, .dentry = dentry }; |
b5e95b48 | 248 | |
31f75bfe | 249 | return common_perm(op, &path, mask, cond); |
b5e95b48 JJ |
250 | } |
251 | ||
252 | /** | |
253 | * common_perm_rm - common permission wrapper for operations doing rm | |
254 | * @op: operation being checked | |
255 | * @dir: directory that the dentry is in (NOT NULL) | |
256 | * @dentry: dentry being rm'd (NOT NULL) | |
257 | * @mask: requested permission mask | |
258 | * | |
259 | * Returns: %0 else error code if error or permission denied | |
260 | */ | |
47f6e5cc | 261 | static int common_perm_rm(const char *op, const struct path *dir, |
b5e95b48 JJ |
262 | struct dentry *dentry, u32 mask) |
263 | { | |
c6f493d6 | 264 | struct inode *inode = d_backing_inode(dentry); |
b5e95b48 JJ |
265 | struct path_cond cond = { }; |
266 | ||
efeee83a | 267 | if (!inode || !path_mediated_fs(dentry)) |
b5e95b48 JJ |
268 | return 0; |
269 | ||
270 | cond.uid = inode->i_uid; | |
271 | cond.mode = inode->i_mode; | |
272 | ||
273 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
274 | } | |
275 | ||
276 | /** | |
277 | * common_perm_create - common permission wrapper for operations doing create | |
278 | * @op: operation being checked | |
279 | * @dir: directory that dentry will be created in (NOT NULL) | |
280 | * @dentry: dentry to create (NOT NULL) | |
281 | * @mask: request permission mask | |
282 | * @mode: created file mode | |
283 | * | |
284 | * Returns: %0 else error code if error or permission denied | |
285 | */ | |
47f6e5cc | 286 | static int common_perm_create(const char *op, const struct path *dir, |
d6b49f7a | 287 | struct dentry *dentry, u32 mask, umode_t mode) |
b5e95b48 JJ |
288 | { |
289 | struct path_cond cond = { current_fsuid(), mode }; | |
290 | ||
efeee83a | 291 | if (!path_mediated_fs(dir->dentry)) |
b5e95b48 JJ |
292 | return 0; |
293 | ||
294 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
295 | } | |
296 | ||
989f74e0 | 297 | static int apparmor_path_unlink(const struct path *dir, struct dentry *dentry) |
b5e95b48 JJ |
298 | { |
299 | return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE); | |
300 | } | |
301 | ||
d3607752 | 302 | static int apparmor_path_mkdir(const struct path *dir, struct dentry *dentry, |
4572befe | 303 | umode_t mode) |
b5e95b48 JJ |
304 | { |
305 | return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE, | |
306 | S_IFDIR); | |
307 | } | |
308 | ||
989f74e0 | 309 | static int apparmor_path_rmdir(const struct path *dir, struct dentry *dentry) |
b5e95b48 JJ |
310 | { |
311 | return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE); | |
312 | } | |
313 | ||
d3607752 | 314 | static int apparmor_path_mknod(const struct path *dir, struct dentry *dentry, |
04fc66e7 | 315 | umode_t mode, unsigned int dev) |
b5e95b48 JJ |
316 | { |
317 | return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode); | |
318 | } | |
319 | ||
81f4c506 | 320 | static int apparmor_path_truncate(const struct path *path) |
b5e95b48 | 321 | { |
e53cfe6c | 322 | return common_perm_cond(OP_TRUNC, path, MAY_WRITE | AA_MAY_SETATTR); |
b5e95b48 JJ |
323 | } |
324 | ||
d3607752 | 325 | static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry, |
b5e95b48 JJ |
326 | const char *old_name) |
327 | { | |
328 | return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE, | |
329 | S_IFLNK); | |
330 | } | |
331 | ||
3ccee46a | 332 | static int apparmor_path_link(struct dentry *old_dentry, const struct path *new_dir, |
b5e95b48 JJ |
333 | struct dentry *new_dentry) |
334 | { | |
637f688d | 335 | struct aa_label *label; |
b5e95b48 JJ |
336 | int error = 0; |
337 | ||
efeee83a | 338 | if (!path_mediated_fs(old_dentry)) |
b5e95b48 JJ |
339 | return 0; |
340 | ||
637f688d JJ |
341 | label = begin_current_label_crit_section(); |
342 | if (!unconfined(label)) | |
8014370f | 343 | error = aa_path_link(label, old_dentry, new_dir, new_dentry); |
637f688d | 344 | end_current_label_crit_section(label); |
cf797c0e | 345 | |
b5e95b48 JJ |
346 | return error; |
347 | } | |
348 | ||
3ccee46a AV |
349 | static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry, |
350 | const struct path *new_dir, struct dentry *new_dentry) | |
b5e95b48 | 351 | { |
637f688d | 352 | struct aa_label *label; |
b5e95b48 JJ |
353 | int error = 0; |
354 | ||
efeee83a | 355 | if (!path_mediated_fs(old_dentry)) |
b5e95b48 JJ |
356 | return 0; |
357 | ||
637f688d JJ |
358 | label = begin_current_label_crit_section(); |
359 | if (!unconfined(label)) { | |
8486adf0 KC |
360 | struct path old_path = { .mnt = old_dir->mnt, |
361 | .dentry = old_dentry }; | |
362 | struct path new_path = { .mnt = new_dir->mnt, | |
363 | .dentry = new_dentry }; | |
c6f493d6 DH |
364 | struct path_cond cond = { d_backing_inode(old_dentry)->i_uid, |
365 | d_backing_inode(old_dentry)->i_mode | |
b5e95b48 JJ |
366 | }; |
367 | ||
aebd873e | 368 | error = aa_path_perm(OP_RENAME_SRC, label, &old_path, 0, |
e53cfe6c JJ |
369 | MAY_READ | AA_MAY_GETATTR | MAY_WRITE | |
370 | AA_MAY_SETATTR | AA_MAY_DELETE, | |
b5e95b48 JJ |
371 | &cond); |
372 | if (!error) | |
aebd873e | 373 | error = aa_path_perm(OP_RENAME_DEST, label, &new_path, |
e53cfe6c | 374 | 0, MAY_WRITE | AA_MAY_SETATTR | |
b5e95b48 JJ |
375 | AA_MAY_CREATE, &cond); |
376 | ||
377 | } | |
637f688d | 378 | end_current_label_crit_section(label); |
cf797c0e | 379 | |
b5e95b48 JJ |
380 | return error; |
381 | } | |
382 | ||
be01f9f2 | 383 | static int apparmor_path_chmod(const struct path *path, umode_t mode) |
b5e95b48 | 384 | { |
31f75bfe | 385 | return common_perm_cond(OP_CHMOD, path, AA_MAY_CHMOD); |
b5e95b48 JJ |
386 | } |
387 | ||
7fd25dac | 388 | static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid) |
b5e95b48 | 389 | { |
31f75bfe | 390 | return common_perm_cond(OP_CHOWN, path, AA_MAY_CHOWN); |
b5e95b48 JJ |
391 | } |
392 | ||
3f7036a0 | 393 | static int apparmor_inode_getattr(const struct path *path) |
b5e95b48 | 394 | { |
e53cfe6c | 395 | return common_perm_cond(OP_GETATTR, path, AA_MAY_GETATTR); |
b5e95b48 JJ |
396 | } |
397 | ||
83d49856 | 398 | static int apparmor_file_open(struct file *file, const struct cred *cred) |
b5e95b48 | 399 | { |
637f688d JJ |
400 | struct aa_file_ctx *fctx = file_ctx(file); |
401 | struct aa_label *label; | |
b5e95b48 JJ |
402 | int error = 0; |
403 | ||
efeee83a | 404 | if (!path_mediated_fs(file->f_path.dentry)) |
b5e95b48 JJ |
405 | return 0; |
406 | ||
407 | /* If in exec, permission is handled by bprm hooks. | |
408 | * Cache permissions granted by the previous exec check, with | |
409 | * implicit read and executable mmap which are required to | |
410 | * actually execute the image. | |
411 | */ | |
412 | if (current->in_execve) { | |
55a26ebf | 413 | fctx->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP; |
b5e95b48 JJ |
414 | return 0; |
415 | } | |
416 | ||
637f688d JJ |
417 | label = aa_get_newest_cred_label(cred); |
418 | if (!unconfined(label)) { | |
496ad9aa | 419 | struct inode *inode = file_inode(file); |
b5e95b48 JJ |
420 | struct path_cond cond = { inode->i_uid, inode->i_mode }; |
421 | ||
aebd873e | 422 | error = aa_path_perm(OP_OPEN, label, &file->f_path, 0, |
b5e95b48 JJ |
423 | aa_map_file_to_perms(file), &cond); |
424 | /* todo cache full allowed permissions set and state */ | |
55a26ebf | 425 | fctx->allow = aa_map_file_to_perms(file); |
b5e95b48 | 426 | } |
637f688d | 427 | aa_put_label(label); |
b5e95b48 JJ |
428 | |
429 | return error; | |
430 | } | |
431 | ||
432 | static int apparmor_file_alloc_security(struct file *file) | |
433 | { | |
cf797c0e JJ |
434 | int error = 0; |
435 | ||
b5e95b48 | 436 | /* freed by apparmor_file_free_security */ |
637f688d | 437 | struct aa_label *label = begin_current_label_crit_section(); |
190a9518 | 438 | file->f_security = aa_alloc_file_ctx(label, GFP_KERNEL); |
2835a13b JJ |
439 | if (!file_ctx(file)) |
440 | error = -ENOMEM; | |
637f688d | 441 | end_current_label_crit_section(label); |
b5e95b48 | 442 | |
cf797c0e | 443 | return error; |
b5e95b48 JJ |
444 | } |
445 | ||
446 | static void apparmor_file_free_security(struct file *file) | |
447 | { | |
2835a13b | 448 | aa_free_file_ctx(file_ctx(file)); |
b5e95b48 JJ |
449 | } |
450 | ||
47f6e5cc | 451 | static int common_file_perm(const char *op, struct file *file, u32 mask) |
b5e95b48 | 452 | { |
190a9518 | 453 | struct aa_label *label; |
b5e95b48 JJ |
454 | int error = 0; |
455 | ||
192ca6b5 JJ |
456 | /* don't reaudit files closed during inheritance */ |
457 | if (file->f_path.dentry == aa_null.dentry) | |
458 | return -EACCES; | |
459 | ||
637f688d | 460 | label = __begin_current_label_crit_section(); |
190a9518 | 461 | error = aa_file_perm(op, label, file, mask); |
637f688d | 462 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
463 | |
464 | return error; | |
465 | } | |
466 | ||
064dc947 JJ |
467 | static int apparmor_file_receive(struct file *file) |
468 | { | |
469 | return common_file_perm(OP_FRECEIVE, file, aa_map_file_to_perms(file)); | |
470 | } | |
471 | ||
b5e95b48 JJ |
472 | static int apparmor_file_permission(struct file *file, int mask) |
473 | { | |
474 | return common_file_perm(OP_FPERM, file, mask); | |
475 | } | |
476 | ||
477 | static int apparmor_file_lock(struct file *file, unsigned int cmd) | |
478 | { | |
479 | u32 mask = AA_MAY_LOCK; | |
480 | ||
481 | if (cmd == F_WRLCK) | |
482 | mask |= MAY_WRITE; | |
483 | ||
484 | return common_file_perm(OP_FLOCK, file, mask); | |
485 | } | |
486 | ||
47f6e5cc | 487 | static int common_mmap(const char *op, struct file *file, unsigned long prot, |
b5e95b48 JJ |
488 | unsigned long flags) |
489 | { | |
b5e95b48 JJ |
490 | int mask = 0; |
491 | ||
637f688d | 492 | if (!file || !file_ctx(file)) |
b5e95b48 JJ |
493 | return 0; |
494 | ||
495 | if (prot & PROT_READ) | |
496 | mask |= MAY_READ; | |
497 | /* | |
498 | * Private mappings don't require write perms since they don't | |
499 | * write back to the files | |
500 | */ | |
501 | if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE)) | |
502 | mask |= MAY_WRITE; | |
503 | if (prot & PROT_EXEC) | |
504 | mask |= AA_EXEC_MMAP; | |
505 | ||
b5e95b48 JJ |
506 | return common_file_perm(op, file, mask); |
507 | } | |
508 | ||
e5467859 AV |
509 | static int apparmor_mmap_file(struct file *file, unsigned long reqprot, |
510 | unsigned long prot, unsigned long flags) | |
b5e95b48 | 511 | { |
b5e95b48 JJ |
512 | return common_mmap(OP_FMMAP, file, prot, flags); |
513 | } | |
514 | ||
515 | static int apparmor_file_mprotect(struct vm_area_struct *vma, | |
516 | unsigned long reqprot, unsigned long prot) | |
517 | { | |
518 | return common_mmap(OP_FMPROT, vma->vm_file, prot, | |
519 | !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0); | |
520 | } | |
521 | ||
2ea3ffb7 JJ |
522 | static int apparmor_sb_mount(const char *dev_name, const struct path *path, |
523 | const char *type, unsigned long flags, void *data) | |
524 | { | |
525 | struct aa_label *label; | |
526 | int error = 0; | |
527 | ||
528 | /* Discard magic */ | |
529 | if ((flags & MS_MGC_MSK) == MS_MGC_VAL) | |
530 | flags &= ~MS_MGC_MSK; | |
531 | ||
532 | flags &= ~AA_MS_IGNORE_MASK; | |
533 | ||
534 | label = __begin_current_label_crit_section(); | |
535 | if (!unconfined(label)) { | |
536 | if (flags & MS_REMOUNT) | |
537 | error = aa_remount(label, path, flags, data); | |
538 | else if (flags & MS_BIND) | |
539 | error = aa_bind_mount(label, path, dev_name, flags); | |
540 | else if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE | | |
541 | MS_UNBINDABLE)) | |
542 | error = aa_mount_change_type(label, path, flags); | |
543 | else if (flags & MS_MOVE) | |
544 | error = aa_move_mount(label, path, dev_name); | |
545 | else | |
546 | error = aa_new_mount(label, dev_name, path, type, | |
547 | flags, data); | |
548 | } | |
549 | __end_current_label_crit_section(label); | |
550 | ||
551 | return error; | |
552 | } | |
553 | ||
554 | static int apparmor_sb_umount(struct vfsmount *mnt, int flags) | |
555 | { | |
556 | struct aa_label *label; | |
557 | int error = 0; | |
558 | ||
559 | label = __begin_current_label_crit_section(); | |
560 | if (!unconfined(label)) | |
561 | error = aa_umount(label, mnt, flags); | |
562 | __end_current_label_crit_section(label); | |
563 | ||
564 | return error; | |
565 | } | |
566 | ||
567 | static int apparmor_sb_pivotroot(const struct path *old_path, | |
568 | const struct path *new_path) | |
569 | { | |
570 | struct aa_label *label; | |
571 | int error = 0; | |
572 | ||
573 | label = aa_get_current_label(); | |
574 | if (!unconfined(label)) | |
575 | error = aa_pivotroot(label, old_path, new_path); | |
576 | aa_put_label(label); | |
577 | ||
578 | return error; | |
579 | } | |
580 | ||
b5e95b48 JJ |
581 | static int apparmor_getprocattr(struct task_struct *task, char *name, |
582 | char **value) | |
583 | { | |
584 | int error = -ENOENT; | |
b5e95b48 JJ |
585 | /* released below */ |
586 | const struct cred *cred = get_task_cred(task); | |
de62de59 | 587 | struct aa_task_ctx *ctx = task_ctx(current); |
637f688d | 588 | struct aa_label *label = NULL; |
b5e95b48 JJ |
589 | |
590 | if (strcmp(name, "current") == 0) | |
d9087c49 | 591 | label = aa_get_newest_label(cred_label(cred)); |
55a26ebf | 592 | else if (strcmp(name, "prev") == 0 && ctx->previous) |
637f688d | 593 | label = aa_get_newest_label(ctx->previous); |
55a26ebf | 594 | else if (strcmp(name, "exec") == 0 && ctx->onexec) |
637f688d | 595 | label = aa_get_newest_label(ctx->onexec); |
b5e95b48 JJ |
596 | else |
597 | error = -EINVAL; | |
598 | ||
637f688d | 599 | if (label) |
76a1d263 | 600 | error = aa_getprocattr(label, value); |
77b071b3 | 601 | |
637f688d | 602 | aa_put_label(label); |
b5e95b48 JJ |
603 | put_cred(cred); |
604 | ||
605 | return error; | |
606 | } | |
607 | ||
b21507e2 SS |
608 | static int apparmor_setprocattr(const char *name, void *value, |
609 | size_t size) | |
b5e95b48 | 610 | { |
e89b8081 | 611 | char *command, *largs = NULL, *args = value; |
b5e95b48 JJ |
612 | size_t arg_size; |
613 | int error; | |
ef88a7ac | 614 | DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SETPROCATTR); |
b5e95b48 JJ |
615 | |
616 | if (size == 0) | |
617 | return -EINVAL; | |
b5e95b48 | 618 | |
e89b8081 VN |
619 | /* AppArmor requires that the buffer must be null terminated atm */ |
620 | if (args[size - 1] != '\0') { | |
621 | /* null terminate */ | |
622 | largs = args = kmalloc(size + 1, GFP_KERNEL); | |
623 | if (!args) | |
624 | return -ENOMEM; | |
625 | memcpy(args, value, size); | |
626 | args[size] = '\0'; | |
627 | } | |
628 | ||
629 | error = -EINVAL; | |
b5e95b48 JJ |
630 | args = strim(args); |
631 | command = strsep(&args, " "); | |
632 | if (!args) | |
e89b8081 | 633 | goto out; |
b5e95b48 JJ |
634 | args = skip_spaces(args); |
635 | if (!*args) | |
e89b8081 | 636 | goto out; |
b5e95b48 | 637 | |
d4d03f74 | 638 | arg_size = size - (args - (largs ? largs : (char *) value)); |
b5e95b48 JJ |
639 | if (strcmp(name, "current") == 0) { |
640 | if (strcmp(command, "changehat") == 0) { | |
641 | error = aa_setprocattr_changehat(args, arg_size, | |
df8073c6 | 642 | AA_CHANGE_NOFLAGS); |
b5e95b48 JJ |
643 | } else if (strcmp(command, "permhat") == 0) { |
644 | error = aa_setprocattr_changehat(args, arg_size, | |
df8073c6 | 645 | AA_CHANGE_TEST); |
b5e95b48 | 646 | } else if (strcmp(command, "changeprofile") == 0) { |
df8073c6 | 647 | error = aa_change_profile(args, AA_CHANGE_NOFLAGS); |
b5e95b48 | 648 | } else if (strcmp(command, "permprofile") == 0) { |
df8073c6 | 649 | error = aa_change_profile(args, AA_CHANGE_TEST); |
6c5fc8f1 JJ |
650 | } else if (strcmp(command, "stack") == 0) { |
651 | error = aa_change_profile(args, AA_CHANGE_STACK); | |
3eea57c2 JJ |
652 | } else |
653 | goto fail; | |
b5e95b48 | 654 | } else if (strcmp(name, "exec") == 0) { |
3eea57c2 | 655 | if (strcmp(command, "exec") == 0) |
df8073c6 | 656 | error = aa_change_profile(args, AA_CHANGE_ONEXEC); |
6c5fc8f1 JJ |
657 | else if (strcmp(command, "stack") == 0) |
658 | error = aa_change_profile(args, (AA_CHANGE_ONEXEC | | |
659 | AA_CHANGE_STACK)); | |
3eea57c2 JJ |
660 | else |
661 | goto fail; | |
662 | } else | |
b5e95b48 | 663 | /* only support the "current" and "exec" process attributes */ |
e89b8081 | 664 | goto fail; |
3eea57c2 | 665 | |
b5e95b48 JJ |
666 | if (!error) |
667 | error = size; | |
e89b8081 VN |
668 | out: |
669 | kfree(largs); | |
b5e95b48 | 670 | return error; |
3eea57c2 JJ |
671 | |
672 | fail: | |
637f688d | 673 | aad(&sa)->label = begin_current_label_crit_section(); |
ef88a7ac JJ |
674 | aad(&sa)->info = name; |
675 | aad(&sa)->error = error = -EINVAL; | |
3eea57c2 | 676 | aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL); |
637f688d | 677 | end_current_label_crit_section(aad(&sa)->label); |
e89b8081 | 678 | goto out; |
b5e95b48 JJ |
679 | } |
680 | ||
fe864821 JJ |
681 | /** |
682 | * apparmor_bprm_committing_creds - do task cleanup on committing new creds | |
683 | * @bprm: binprm for the exec (NOT NULL) | |
684 | */ | |
685 | static void apparmor_bprm_committing_creds(struct linux_binprm *bprm) | |
686 | { | |
637f688d | 687 | struct aa_label *label = aa_current_raw_label(); |
d9087c49 | 688 | struct aa_label *new_label = cred_label(bprm->cred); |
fe864821 JJ |
689 | |
690 | /* bail out if unconfined or not changing profile */ | |
d9087c49 JJ |
691 | if ((new_label->proxy == label->proxy) || |
692 | (unconfined(new_label))) | |
fe864821 JJ |
693 | return; |
694 | ||
192ca6b5 JJ |
695 | aa_inherit_files(bprm->cred, current->files); |
696 | ||
fe864821 JJ |
697 | current->pdeath_signal = 0; |
698 | ||
637f688d | 699 | /* reset soft limits and set hard limits for the new label */ |
d9087c49 | 700 | __aa_transition_rlimits(label, new_label); |
fe864821 JJ |
701 | } |
702 | ||
703 | /** | |
704 | * apparmor_bprm_committed_cred - do cleanup after new creds committed | |
705 | * @bprm: binprm for the exec (NOT NULL) | |
706 | */ | |
707 | static void apparmor_bprm_committed_creds(struct linux_binprm *bprm) | |
708 | { | |
3b529a76 | 709 | /* clear out temporary/transitional state from the context */ |
de62de59 | 710 | aa_clear_task_ctx_trans(task_ctx(current)); |
3b529a76 | 711 | |
fe864821 JJ |
712 | return; |
713 | } | |
714 | ||
a7ae3645 JJ |
715 | static void apparmor_task_getsecid(struct task_struct *p, u32 *secid) |
716 | { | |
717 | struct aa_label *label = aa_get_task_label(p); | |
718 | *secid = label->secid; | |
719 | aa_put_label(label); | |
720 | } | |
721 | ||
7cb4dc9f JS |
722 | static int apparmor_task_setrlimit(struct task_struct *task, |
723 | unsigned int resource, struct rlimit *new_rlim) | |
b5e95b48 | 724 | { |
637f688d | 725 | struct aa_label *label = __begin_current_label_crit_section(); |
b5e95b48 JJ |
726 | int error = 0; |
727 | ||
637f688d | 728 | if (!unconfined(label)) |
86b92cb7 | 729 | error = aa_task_setrlimit(label, task, resource, new_rlim); |
637f688d | 730 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
731 | |
732 | return error; | |
733 | } | |
734 | ||
cd1dbf76 | 735 | static int apparmor_task_kill(struct task_struct *target, struct siginfo *info, |
6b4f3d01 | 736 | int sig, const struct cred *cred) |
cd1dbf76 JJ |
737 | { |
738 | struct aa_label *cl, *tl; | |
739 | int error; | |
740 | ||
6b4f3d01 SS |
741 | if (cred) { |
742 | /* | |
743 | * Dealing with USB IO specific behavior | |
cd1dbf76 | 744 | */ |
6b4f3d01 SS |
745 | cl = aa_get_newest_cred_label(cred); |
746 | tl = aa_get_task_label(target); | |
747 | error = aa_may_signal(cl, tl, sig); | |
748 | aa_put_label(cl); | |
749 | aa_put_label(tl); | |
750 | return error; | |
751 | } | |
752 | ||
cd1dbf76 JJ |
753 | cl = __begin_current_label_crit_section(); |
754 | tl = aa_get_task_label(target); | |
755 | error = aa_may_signal(cl, tl, sig); | |
756 | aa_put_label(tl); | |
757 | __end_current_label_crit_section(cl); | |
758 | ||
759 | return error; | |
760 | } | |
761 | ||
56974a6f JJ |
762 | /** |
763 | * apparmor_sk_alloc_security - allocate and attach the sk_security field | |
764 | */ | |
765 | static int apparmor_sk_alloc_security(struct sock *sk, int family, gfp_t flags) | |
766 | { | |
767 | struct aa_sk_ctx *ctx; | |
768 | ||
769 | ctx = kzalloc(sizeof(*ctx), flags); | |
770 | if (!ctx) | |
771 | return -ENOMEM; | |
772 | ||
773 | SK_CTX(sk) = ctx; | |
774 | ||
775 | return 0; | |
776 | } | |
777 | ||
778 | /** | |
779 | * apparmor_sk_free_security - free the sk_security field | |
780 | */ | |
781 | static void apparmor_sk_free_security(struct sock *sk) | |
782 | { | |
783 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
784 | ||
785 | SK_CTX(sk) = NULL; | |
786 | aa_put_label(ctx->label); | |
787 | aa_put_label(ctx->peer); | |
788 | kfree(ctx); | |
789 | } | |
790 | ||
791 | /** | |
792 | * apparmor_clone_security - clone the sk_security field | |
793 | */ | |
794 | static void apparmor_sk_clone_security(const struct sock *sk, | |
795 | struct sock *newsk) | |
796 | { | |
797 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
798 | struct aa_sk_ctx *new = SK_CTX(newsk); | |
799 | ||
800 | new->label = aa_get_label(ctx->label); | |
801 | new->peer = aa_get_label(ctx->peer); | |
802 | } | |
803 | ||
804 | /** | |
805 | * apparmor_socket_create - check perms before creating a new socket | |
806 | */ | |
807 | static int apparmor_socket_create(int family, int type, int protocol, int kern) | |
808 | { | |
809 | struct aa_label *label; | |
810 | int error = 0; | |
811 | ||
812 | AA_BUG(in_interrupt()); | |
813 | ||
814 | label = begin_current_label_crit_section(); | |
815 | if (!(kern || unconfined(label))) | |
816 | error = af_select(family, | |
817 | create_perm(label, family, type, protocol), | |
818 | aa_af_perm(label, OP_CREATE, AA_MAY_CREATE, | |
819 | family, type, protocol)); | |
820 | end_current_label_crit_section(label); | |
821 | ||
822 | return error; | |
823 | } | |
824 | ||
825 | /** | |
826 | * apparmor_socket_post_create - setup the per-socket security struct | |
827 | * | |
828 | * Note: | |
829 | * - kernel sockets currently labeled unconfined but we may want to | |
830 | * move to a special kernel label | |
831 | * - socket may not have sk here if created with sock_create_lite or | |
832 | * sock_alloc. These should be accept cases which will be handled in | |
833 | * sock_graft. | |
834 | */ | |
835 | static int apparmor_socket_post_create(struct socket *sock, int family, | |
836 | int type, int protocol, int kern) | |
837 | { | |
838 | struct aa_label *label; | |
839 | ||
840 | if (kern) { | |
841 | struct aa_ns *ns = aa_get_current_ns(); | |
842 | ||
843 | label = aa_get_label(ns_unconfined(ns)); | |
844 | aa_put_ns(ns); | |
845 | } else | |
846 | label = aa_get_current_label(); | |
847 | ||
848 | if (sock->sk) { | |
849 | struct aa_sk_ctx *ctx = SK_CTX(sock->sk); | |
850 | ||
851 | aa_put_label(ctx->label); | |
852 | ctx->label = aa_get_label(label); | |
853 | } | |
854 | aa_put_label(label); | |
855 | ||
856 | return 0; | |
857 | } | |
858 | ||
859 | /** | |
860 | * apparmor_socket_bind - check perms before bind addr to socket | |
861 | */ | |
862 | static int apparmor_socket_bind(struct socket *sock, | |
863 | struct sockaddr *address, int addrlen) | |
864 | { | |
865 | AA_BUG(!sock); | |
866 | AA_BUG(!sock->sk); | |
867 | AA_BUG(!address); | |
868 | AA_BUG(in_interrupt()); | |
869 | ||
870 | return af_select(sock->sk->sk_family, | |
871 | bind_perm(sock, address, addrlen), | |
872 | aa_sk_perm(OP_BIND, AA_MAY_BIND, sock->sk)); | |
873 | } | |
874 | ||
875 | /** | |
876 | * apparmor_socket_connect - check perms before connecting @sock to @address | |
877 | */ | |
878 | static int apparmor_socket_connect(struct socket *sock, | |
879 | struct sockaddr *address, int addrlen) | |
880 | { | |
881 | AA_BUG(!sock); | |
882 | AA_BUG(!sock->sk); | |
883 | AA_BUG(!address); | |
884 | AA_BUG(in_interrupt()); | |
885 | ||
886 | return af_select(sock->sk->sk_family, | |
887 | connect_perm(sock, address, addrlen), | |
888 | aa_sk_perm(OP_CONNECT, AA_MAY_CONNECT, sock->sk)); | |
889 | } | |
890 | ||
891 | /** | |
892 | * apparmor_socket_list - check perms before allowing listen | |
893 | */ | |
894 | static int apparmor_socket_listen(struct socket *sock, int backlog) | |
895 | { | |
896 | AA_BUG(!sock); | |
897 | AA_BUG(!sock->sk); | |
898 | AA_BUG(in_interrupt()); | |
899 | ||
900 | return af_select(sock->sk->sk_family, | |
901 | listen_perm(sock, backlog), | |
902 | aa_sk_perm(OP_LISTEN, AA_MAY_LISTEN, sock->sk)); | |
903 | } | |
904 | ||
905 | /** | |
906 | * apparmor_socket_accept - check perms before accepting a new connection. | |
907 | * | |
908 | * Note: while @newsock is created and has some information, the accept | |
909 | * has not been done. | |
910 | */ | |
911 | static int apparmor_socket_accept(struct socket *sock, struct socket *newsock) | |
912 | { | |
913 | AA_BUG(!sock); | |
914 | AA_BUG(!sock->sk); | |
915 | AA_BUG(!newsock); | |
916 | AA_BUG(in_interrupt()); | |
917 | ||
918 | return af_select(sock->sk->sk_family, | |
919 | accept_perm(sock, newsock), | |
920 | aa_sk_perm(OP_ACCEPT, AA_MAY_ACCEPT, sock->sk)); | |
921 | } | |
922 | ||
923 | static int aa_sock_msg_perm(const char *op, u32 request, struct socket *sock, | |
924 | struct msghdr *msg, int size) | |
925 | { | |
926 | AA_BUG(!sock); | |
927 | AA_BUG(!sock->sk); | |
928 | AA_BUG(!msg); | |
929 | AA_BUG(in_interrupt()); | |
930 | ||
931 | return af_select(sock->sk->sk_family, | |
932 | msg_perm(op, request, sock, msg, size), | |
933 | aa_sk_perm(op, request, sock->sk)); | |
934 | } | |
935 | ||
936 | /** | |
937 | * apparmor_socket_sendmsg - check perms before sending msg to another socket | |
938 | */ | |
939 | static int apparmor_socket_sendmsg(struct socket *sock, | |
940 | struct msghdr *msg, int size) | |
941 | { | |
942 | return aa_sock_msg_perm(OP_SENDMSG, AA_MAY_SEND, sock, msg, size); | |
943 | } | |
944 | ||
945 | /** | |
946 | * apparmor_socket_recvmsg - check perms before receiving a message | |
947 | */ | |
948 | static int apparmor_socket_recvmsg(struct socket *sock, | |
949 | struct msghdr *msg, int size, int flags) | |
950 | { | |
951 | return aa_sock_msg_perm(OP_RECVMSG, AA_MAY_RECEIVE, sock, msg, size); | |
952 | } | |
953 | ||
954 | /* revaliation, get/set attr, shutdown */ | |
955 | static int aa_sock_perm(const char *op, u32 request, struct socket *sock) | |
956 | { | |
957 | AA_BUG(!sock); | |
958 | AA_BUG(!sock->sk); | |
959 | AA_BUG(in_interrupt()); | |
960 | ||
961 | return af_select(sock->sk->sk_family, | |
962 | sock_perm(op, request, sock), | |
963 | aa_sk_perm(op, request, sock->sk)); | |
964 | } | |
965 | ||
966 | /** | |
967 | * apparmor_socket_getsockname - check perms before getting the local address | |
968 | */ | |
969 | static int apparmor_socket_getsockname(struct socket *sock) | |
970 | { | |
971 | return aa_sock_perm(OP_GETSOCKNAME, AA_MAY_GETATTR, sock); | |
972 | } | |
973 | ||
974 | /** | |
975 | * apparmor_socket_getpeername - check perms before getting remote address | |
976 | */ | |
977 | static int apparmor_socket_getpeername(struct socket *sock) | |
978 | { | |
979 | return aa_sock_perm(OP_GETPEERNAME, AA_MAY_GETATTR, sock); | |
980 | } | |
981 | ||
982 | /* revaliation, get/set attr, opt */ | |
983 | static int aa_sock_opt_perm(const char *op, u32 request, struct socket *sock, | |
984 | int level, int optname) | |
985 | { | |
986 | AA_BUG(!sock); | |
987 | AA_BUG(!sock->sk); | |
988 | AA_BUG(in_interrupt()); | |
989 | ||
990 | return af_select(sock->sk->sk_family, | |
991 | opt_perm(op, request, sock, level, optname), | |
992 | aa_sk_perm(op, request, sock->sk)); | |
993 | } | |
994 | ||
995 | /** | |
996 | * apparmor_getsockopt - check perms before getting socket options | |
997 | */ | |
998 | static int apparmor_socket_getsockopt(struct socket *sock, int level, | |
999 | int optname) | |
1000 | { | |
1001 | return aa_sock_opt_perm(OP_GETSOCKOPT, AA_MAY_GETOPT, sock, | |
1002 | level, optname); | |
1003 | } | |
1004 | ||
1005 | /** | |
1006 | * apparmor_setsockopt - check perms before setting socket options | |
1007 | */ | |
1008 | static int apparmor_socket_setsockopt(struct socket *sock, int level, | |
1009 | int optname) | |
1010 | { | |
1011 | return aa_sock_opt_perm(OP_SETSOCKOPT, AA_MAY_SETOPT, sock, | |
1012 | level, optname); | |
1013 | } | |
1014 | ||
1015 | /** | |
1016 | * apparmor_socket_shutdown - check perms before shutting down @sock conn | |
1017 | */ | |
1018 | static int apparmor_socket_shutdown(struct socket *sock, int how) | |
1019 | { | |
1020 | return aa_sock_perm(OP_SHUTDOWN, AA_MAY_SHUTDOWN, sock); | |
1021 | } | |
1022 | ||
1023 | /** | |
1024 | * apparmor_socket_sock_recv_skb - check perms before associating skb to sk | |
1025 | * | |
1026 | * Note: can not sleep may be called with locks held | |
1027 | * | |
1028 | * dont want protocol specific in __skb_recv_datagram() | |
1029 | * to deny an incoming connection socket_sock_rcv_skb() | |
1030 | */ | |
1031 | static int apparmor_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
1032 | { | |
1033 | return 0; | |
1034 | } | |
1035 | ||
1036 | ||
1037 | static struct aa_label *sk_peer_label(struct sock *sk) | |
1038 | { | |
1039 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
1040 | ||
1041 | if (ctx->peer) | |
1042 | return ctx->peer; | |
1043 | ||
1044 | return ERR_PTR(-ENOPROTOOPT); | |
1045 | } | |
1046 | ||
1047 | /** | |
1048 | * apparmor_socket_getpeersec_stream - get security context of peer | |
1049 | * | |
1050 | * Note: for tcp only valid if using ipsec or cipso on lan | |
1051 | */ | |
1052 | static int apparmor_socket_getpeersec_stream(struct socket *sock, | |
1053 | char __user *optval, | |
1054 | int __user *optlen, | |
1055 | unsigned int len) | |
1056 | { | |
1057 | char *name; | |
1058 | int slen, error = 0; | |
1059 | struct aa_label *label; | |
1060 | struct aa_label *peer; | |
1061 | ||
1062 | label = begin_current_label_crit_section(); | |
1063 | peer = sk_peer_label(sock->sk); | |
1064 | if (IS_ERR(peer)) { | |
1065 | error = PTR_ERR(peer); | |
1066 | goto done; | |
1067 | } | |
1068 | slen = aa_label_asxprint(&name, labels_ns(label), peer, | |
1069 | FLAG_SHOW_MODE | FLAG_VIEW_SUBNS | | |
1070 | FLAG_HIDDEN_UNCONFINED, GFP_KERNEL); | |
1071 | /* don't include terminating \0 in slen, it breaks some apps */ | |
1072 | if (slen < 0) { | |
1073 | error = -ENOMEM; | |
1074 | } else { | |
1075 | if (slen > len) { | |
1076 | error = -ERANGE; | |
1077 | } else if (copy_to_user(optval, name, slen)) { | |
1078 | error = -EFAULT; | |
1079 | goto out; | |
1080 | } | |
1081 | if (put_user(slen, optlen)) | |
1082 | error = -EFAULT; | |
1083 | out: | |
1084 | kfree(name); | |
1085 | ||
1086 | } | |
1087 | ||
1088 | done: | |
1089 | end_current_label_crit_section(label); | |
1090 | ||
1091 | return error; | |
1092 | } | |
1093 | ||
1094 | /** | |
1095 | * apparmor_socket_getpeersec_dgram - get security label of packet | |
1096 | * @sock: the peer socket | |
1097 | * @skb: packet data | |
1098 | * @secid: pointer to where to put the secid of the packet | |
1099 | * | |
1100 | * Sets the netlabel socket state on sk from parent | |
1101 | */ | |
1102 | static int apparmor_socket_getpeersec_dgram(struct socket *sock, | |
1103 | struct sk_buff *skb, u32 *secid) | |
1104 | ||
1105 | { | |
1106 | /* TODO: requires secid support */ | |
1107 | return -ENOPROTOOPT; | |
1108 | } | |
1109 | ||
1110 | /** | |
1111 | * apparmor_sock_graft - Initialize newly created socket | |
1112 | * @sk: child sock | |
1113 | * @parent: parent socket | |
1114 | * | |
1115 | * Note: could set off of SOCK_CTX(parent) but need to track inode and we can | |
1116 | * just set sk security information off of current creating process label | |
1117 | * Labeling of sk for accept case - probably should be sock based | |
1118 | * instead of task, because of the case where an implicitly labeled | |
1119 | * socket is shared by different tasks. | |
1120 | */ | |
1121 | static void apparmor_sock_graft(struct sock *sk, struct socket *parent) | |
1122 | { | |
1123 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
1124 | ||
1125 | if (!ctx->label) | |
1126 | ctx->label = aa_get_current_label(); | |
1127 | } | |
1128 | ||
ca97d939 | 1129 | static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = { |
e20b043a CS |
1130 | LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check), |
1131 | LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme), | |
1132 | LSM_HOOK_INIT(capget, apparmor_capget), | |
1133 | LSM_HOOK_INIT(capable, apparmor_capable), | |
1134 | ||
2ea3ffb7 JJ |
1135 | LSM_HOOK_INIT(sb_mount, apparmor_sb_mount), |
1136 | LSM_HOOK_INIT(sb_umount, apparmor_sb_umount), | |
1137 | LSM_HOOK_INIT(sb_pivotroot, apparmor_sb_pivotroot), | |
1138 | ||
e20b043a CS |
1139 | LSM_HOOK_INIT(path_link, apparmor_path_link), |
1140 | LSM_HOOK_INIT(path_unlink, apparmor_path_unlink), | |
1141 | LSM_HOOK_INIT(path_symlink, apparmor_path_symlink), | |
1142 | LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir), | |
1143 | LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir), | |
1144 | LSM_HOOK_INIT(path_mknod, apparmor_path_mknod), | |
1145 | LSM_HOOK_INIT(path_rename, apparmor_path_rename), | |
1146 | LSM_HOOK_INIT(path_chmod, apparmor_path_chmod), | |
1147 | LSM_HOOK_INIT(path_chown, apparmor_path_chown), | |
1148 | LSM_HOOK_INIT(path_truncate, apparmor_path_truncate), | |
1149 | LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr), | |
1150 | ||
1151 | LSM_HOOK_INIT(file_open, apparmor_file_open), | |
064dc947 | 1152 | LSM_HOOK_INIT(file_receive, apparmor_file_receive), |
e20b043a CS |
1153 | LSM_HOOK_INIT(file_permission, apparmor_file_permission), |
1154 | LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security), | |
1155 | LSM_HOOK_INIT(file_free_security, apparmor_file_free_security), | |
1156 | LSM_HOOK_INIT(mmap_file, apparmor_mmap_file), | |
e20b043a CS |
1157 | LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect), |
1158 | LSM_HOOK_INIT(file_lock, apparmor_file_lock), | |
1159 | ||
1160 | LSM_HOOK_INIT(getprocattr, apparmor_getprocattr), | |
1161 | LSM_HOOK_INIT(setprocattr, apparmor_setprocattr), | |
1162 | ||
56974a6f JJ |
1163 | LSM_HOOK_INIT(sk_alloc_security, apparmor_sk_alloc_security), |
1164 | LSM_HOOK_INIT(sk_free_security, apparmor_sk_free_security), | |
1165 | LSM_HOOK_INIT(sk_clone_security, apparmor_sk_clone_security), | |
1166 | ||
1167 | LSM_HOOK_INIT(socket_create, apparmor_socket_create), | |
1168 | LSM_HOOK_INIT(socket_post_create, apparmor_socket_post_create), | |
1169 | LSM_HOOK_INIT(socket_bind, apparmor_socket_bind), | |
1170 | LSM_HOOK_INIT(socket_connect, apparmor_socket_connect), | |
1171 | LSM_HOOK_INIT(socket_listen, apparmor_socket_listen), | |
1172 | LSM_HOOK_INIT(socket_accept, apparmor_socket_accept), | |
1173 | LSM_HOOK_INIT(socket_sendmsg, apparmor_socket_sendmsg), | |
1174 | LSM_HOOK_INIT(socket_recvmsg, apparmor_socket_recvmsg), | |
1175 | LSM_HOOK_INIT(socket_getsockname, apparmor_socket_getsockname), | |
1176 | LSM_HOOK_INIT(socket_getpeername, apparmor_socket_getpeername), | |
1177 | LSM_HOOK_INIT(socket_getsockopt, apparmor_socket_getsockopt), | |
1178 | LSM_HOOK_INIT(socket_setsockopt, apparmor_socket_setsockopt), | |
1179 | LSM_HOOK_INIT(socket_shutdown, apparmor_socket_shutdown), | |
1180 | LSM_HOOK_INIT(socket_sock_rcv_skb, apparmor_socket_sock_rcv_skb), | |
1181 | LSM_HOOK_INIT(socket_getpeersec_stream, | |
1182 | apparmor_socket_getpeersec_stream), | |
1183 | LSM_HOOK_INIT(socket_getpeersec_dgram, | |
1184 | apparmor_socket_getpeersec_dgram), | |
1185 | LSM_HOOK_INIT(sock_graft, apparmor_sock_graft), | |
1186 | ||
e20b043a CS |
1187 | LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank), |
1188 | LSM_HOOK_INIT(cred_free, apparmor_cred_free), | |
1189 | LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare), | |
1190 | LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer), | |
1191 | ||
1192 | LSM_HOOK_INIT(bprm_set_creds, apparmor_bprm_set_creds), | |
1193 | LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds), | |
1194 | LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds), | |
e20b043a | 1195 | |
3b529a76 JJ |
1196 | LSM_HOOK_INIT(task_free, apparmor_task_free), |
1197 | LSM_HOOK_INIT(task_alloc, apparmor_task_alloc), | |
a7ae3645 | 1198 | LSM_HOOK_INIT(task_getsecid, apparmor_task_getsecid), |
e20b043a | 1199 | LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit), |
cd1dbf76 | 1200 | LSM_HOOK_INIT(task_kill, apparmor_task_kill), |
c0929212 | 1201 | |
e79c26d0 MG |
1202 | #ifdef CONFIG_AUDIT |
1203 | LSM_HOOK_INIT(audit_rule_init, aa_audit_rule_init), | |
1204 | LSM_HOOK_INIT(audit_rule_known, aa_audit_rule_known), | |
1205 | LSM_HOOK_INIT(audit_rule_match, aa_audit_rule_match), | |
1206 | LSM_HOOK_INIT(audit_rule_free, aa_audit_rule_free), | |
1207 | #endif | |
1208 | ||
c0929212 JJ |
1209 | LSM_HOOK_INIT(secid_to_secctx, apparmor_secid_to_secctx), |
1210 | LSM_HOOK_INIT(secctx_to_secid, apparmor_secctx_to_secid), | |
1211 | LSM_HOOK_INIT(release_secctx, apparmor_release_secctx), | |
b5e95b48 JJ |
1212 | }; |
1213 | ||
1214 | /* | |
1215 | * AppArmor sysfs module parameters | |
1216 | */ | |
1217 | ||
101d6c82 SR |
1218 | static int param_set_aabool(const char *val, const struct kernel_param *kp); |
1219 | static int param_get_aabool(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 1220 | #define param_check_aabool param_check_bool |
9c27847d | 1221 | static const struct kernel_param_ops param_ops_aabool = { |
6a4c2643 | 1222 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
1223 | .set = param_set_aabool, |
1224 | .get = param_get_aabool | |
1225 | }; | |
b5e95b48 | 1226 | |
101d6c82 SR |
1227 | static int param_set_aauint(const char *val, const struct kernel_param *kp); |
1228 | static int param_get_aauint(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 1229 | #define param_check_aauint param_check_uint |
9c27847d | 1230 | static const struct kernel_param_ops param_ops_aauint = { |
101d6c82 SR |
1231 | .set = param_set_aauint, |
1232 | .get = param_get_aauint | |
1233 | }; | |
b5e95b48 | 1234 | |
101d6c82 SR |
1235 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp); |
1236 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 1237 | #define param_check_aalockpolicy param_check_bool |
9c27847d | 1238 | static const struct kernel_param_ops param_ops_aalockpolicy = { |
6a4c2643 | 1239 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
1240 | .set = param_set_aalockpolicy, |
1241 | .get = param_get_aalockpolicy | |
1242 | }; | |
b5e95b48 | 1243 | |
e4dca7b7 KC |
1244 | static int param_set_audit(const char *val, const struct kernel_param *kp); |
1245 | static int param_get_audit(char *buffer, const struct kernel_param *kp); | |
b5e95b48 | 1246 | |
e4dca7b7 KC |
1247 | static int param_set_mode(const char *val, const struct kernel_param *kp); |
1248 | static int param_get_mode(char *buffer, const struct kernel_param *kp); | |
b5e95b48 JJ |
1249 | |
1250 | /* Flag values, also controllable via /sys/module/apparmor/parameters | |
1251 | * We define special types as we want to do additional mediation. | |
1252 | */ | |
1253 | ||
1254 | /* AppArmor global enforcement switch - complain, enforce, kill */ | |
1255 | enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE; | |
1256 | module_param_call(mode, param_set_mode, param_get_mode, | |
1257 | &aa_g_profile_mode, S_IRUSR | S_IWUSR); | |
1258 | ||
6059f71f | 1259 | /* whether policy verification hashing is enabled */ |
7616ac70 | 1260 | bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT); |
3ccb76c5 | 1261 | #ifdef CONFIG_SECURITY_APPARMOR_HASH |
6059f71f | 1262 | module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR); |
7616ac70 | 1263 | #endif |
6059f71f | 1264 | |
b5e95b48 | 1265 | /* Debug mode */ |
eea7a05f | 1266 | bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_APPARMOR_DEBUG_MESSAGES); |
b5e95b48 JJ |
1267 | module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR); |
1268 | ||
1269 | /* Audit mode */ | |
1270 | enum audit_mode aa_g_audit; | |
1271 | module_param_call(audit, param_set_audit, param_get_audit, | |
1272 | &aa_g_audit, S_IRUSR | S_IWUSR); | |
1273 | ||
1274 | /* Determines if audit header is included in audited messages. This | |
1275 | * provides more context if the audit daemon is not running | |
1276 | */ | |
954317fe | 1277 | bool aa_g_audit_header = true; |
b5e95b48 JJ |
1278 | module_param_named(audit_header, aa_g_audit_header, aabool, |
1279 | S_IRUSR | S_IWUSR); | |
1280 | ||
1281 | /* lock out loading/removal of policy | |
1282 | * TODO: add in at boot loading of policy, which is the only way to | |
1283 | * load policy, if lock_policy is set | |
1284 | */ | |
90ab5ee9 | 1285 | bool aa_g_lock_policy; |
b5e95b48 JJ |
1286 | module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy, |
1287 | S_IRUSR | S_IWUSR); | |
1288 | ||
1289 | /* Syscall logging mode */ | |
90ab5ee9 | 1290 | bool aa_g_logsyscall; |
b5e95b48 JJ |
1291 | module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR); |
1292 | ||
1293 | /* Maximum pathname length before accesses will start getting rejected */ | |
1294 | unsigned int aa_g_path_max = 2 * PATH_MAX; | |
622f6e32 | 1295 | module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR); |
b5e95b48 JJ |
1296 | |
1297 | /* Determines how paranoid loading of policy is and how much verification | |
1298 | * on the loaded policy is done. | |
abbf8734 JJ |
1299 | * DEPRECATED: read only as strict checking of load is always done now |
1300 | * that none root users (user namespaces) can load policy. | |
b5e95b48 | 1301 | */ |
954317fe | 1302 | bool aa_g_paranoid_load = true; |
abbf8734 | 1303 | module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO); |
b5e95b48 JJ |
1304 | |
1305 | /* Boot time disable flag */ | |
90ab5ee9 | 1306 | static bool apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE; |
c611616c | 1307 | module_param_named(enabled, apparmor_enabled, bool, S_IRUGO); |
b5e95b48 JJ |
1308 | |
1309 | static int __init apparmor_enabled_setup(char *str) | |
1310 | { | |
1311 | unsigned long enabled; | |
29707b20 | 1312 | int error = kstrtoul(str, 0, &enabled); |
b5e95b48 JJ |
1313 | if (!error) |
1314 | apparmor_enabled = enabled ? 1 : 0; | |
1315 | return 1; | |
1316 | } | |
1317 | ||
1318 | __setup("apparmor=", apparmor_enabled_setup); | |
1319 | ||
1320 | /* set global flag turning off the ability to load policy */ | |
101d6c82 | 1321 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp) |
b5e95b48 | 1322 | { |
545de8fe JJ |
1323 | if (!apparmor_enabled) |
1324 | return -EINVAL; | |
1325 | if (apparmor_initialized && !policy_admin_capable(NULL)) | |
b5e95b48 | 1326 | return -EPERM; |
b5e95b48 JJ |
1327 | return param_set_bool(val, kp); |
1328 | } | |
1329 | ||
101d6c82 | 1330 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1331 | { |
ca4bd5ae JJ |
1332 | if (!apparmor_enabled) |
1333 | return -EINVAL; | |
545de8fe JJ |
1334 | if (apparmor_initialized && !policy_view_capable(NULL)) |
1335 | return -EPERM; | |
b5e95b48 JJ |
1336 | return param_get_bool(buffer, kp); |
1337 | } | |
1338 | ||
101d6c82 | 1339 | static int param_set_aabool(const char *val, const struct kernel_param *kp) |
b5e95b48 | 1340 | { |
ca4bd5ae JJ |
1341 | if (!apparmor_enabled) |
1342 | return -EINVAL; | |
545de8fe JJ |
1343 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
1344 | return -EPERM; | |
b5e95b48 JJ |
1345 | return param_set_bool(val, kp); |
1346 | } | |
1347 | ||
101d6c82 | 1348 | static int param_get_aabool(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1349 | { |
ca4bd5ae JJ |
1350 | if (!apparmor_enabled) |
1351 | return -EINVAL; | |
545de8fe JJ |
1352 | if (apparmor_initialized && !policy_view_capable(NULL)) |
1353 | return -EPERM; | |
b5e95b48 JJ |
1354 | return param_get_bool(buffer, kp); |
1355 | } | |
1356 | ||
101d6c82 | 1357 | static int param_set_aauint(const char *val, const struct kernel_param *kp) |
b5e95b48 | 1358 | { |
39d84824 JJ |
1359 | int error; |
1360 | ||
ca4bd5ae JJ |
1361 | if (!apparmor_enabled) |
1362 | return -EINVAL; | |
39d84824 JJ |
1363 | /* file is ro but enforce 2nd line check */ |
1364 | if (apparmor_initialized) | |
545de8fe | 1365 | return -EPERM; |
39d84824 JJ |
1366 | |
1367 | error = param_set_uint(val, kp); | |
1368 | pr_info("AppArmor: buffer size set to %d bytes\n", aa_g_path_max); | |
1369 | ||
1370 | return error; | |
b5e95b48 JJ |
1371 | } |
1372 | ||
101d6c82 | 1373 | static int param_get_aauint(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1374 | { |
ca4bd5ae JJ |
1375 | if (!apparmor_enabled) |
1376 | return -EINVAL; | |
545de8fe JJ |
1377 | if (apparmor_initialized && !policy_view_capable(NULL)) |
1378 | return -EPERM; | |
b5e95b48 JJ |
1379 | return param_get_uint(buffer, kp); |
1380 | } | |
1381 | ||
e4dca7b7 | 1382 | static int param_get_audit(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1383 | { |
b5e95b48 JJ |
1384 | if (!apparmor_enabled) |
1385 | return -EINVAL; | |
545de8fe JJ |
1386 | if (apparmor_initialized && !policy_view_capable(NULL)) |
1387 | return -EPERM; | |
b5e95b48 JJ |
1388 | return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]); |
1389 | } | |
1390 | ||
e4dca7b7 | 1391 | static int param_set_audit(const char *val, const struct kernel_param *kp) |
b5e95b48 JJ |
1392 | { |
1393 | int i; | |
b5e95b48 JJ |
1394 | |
1395 | if (!apparmor_enabled) | |
1396 | return -EINVAL; | |
b5e95b48 JJ |
1397 | if (!val) |
1398 | return -EINVAL; | |
545de8fe JJ |
1399 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
1400 | return -EPERM; | |
b5e95b48 | 1401 | |
5d8779a5 AS |
1402 | i = match_string(audit_mode_names, AUDIT_MAX_INDEX, val); |
1403 | if (i < 0) | |
1404 | return -EINVAL; | |
b5e95b48 | 1405 | |
5d8779a5 AS |
1406 | aa_g_audit = i; |
1407 | return 0; | |
b5e95b48 JJ |
1408 | } |
1409 | ||
e4dca7b7 | 1410 | static int param_get_mode(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1411 | { |
b5e95b48 JJ |
1412 | if (!apparmor_enabled) |
1413 | return -EINVAL; | |
545de8fe JJ |
1414 | if (apparmor_initialized && !policy_view_capable(NULL)) |
1415 | return -EPERM; | |
b5e95b48 | 1416 | |
0d259f04 | 1417 | return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]); |
b5e95b48 JJ |
1418 | } |
1419 | ||
e4dca7b7 | 1420 | static int param_set_mode(const char *val, const struct kernel_param *kp) |
b5e95b48 JJ |
1421 | { |
1422 | int i; | |
b5e95b48 JJ |
1423 | |
1424 | if (!apparmor_enabled) | |
1425 | return -EINVAL; | |
b5e95b48 JJ |
1426 | if (!val) |
1427 | return -EINVAL; | |
545de8fe JJ |
1428 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
1429 | return -EPERM; | |
b5e95b48 | 1430 | |
5d8779a5 AS |
1431 | i = match_string(aa_profile_mode_names, APPARMOR_MODE_NAMES_MAX_INDEX, |
1432 | val); | |
1433 | if (i < 0) | |
1434 | return -EINVAL; | |
b5e95b48 | 1435 | |
5d8779a5 AS |
1436 | aa_g_profile_mode = i; |
1437 | return 0; | |
b5e95b48 JJ |
1438 | } |
1439 | ||
1440 | /* | |
1441 | * AppArmor init functions | |
1442 | */ | |
1443 | ||
1444 | /** | |
55a26ebf | 1445 | * set_init_ctx - set a task context and profile on the first task. |
b5e95b48 JJ |
1446 | * |
1447 | * TODO: allow setting an alternate profile than unconfined | |
1448 | */ | |
55a26ebf | 1449 | static int __init set_init_ctx(void) |
b5e95b48 JJ |
1450 | { |
1451 | struct cred *cred = (struct cred *)current->real_cred; | |
55a26ebf | 1452 | struct aa_task_ctx *ctx; |
b5e95b48 | 1453 | |
f175221a | 1454 | ctx = aa_alloc_task_ctx(GFP_KERNEL); |
55a26ebf | 1455 | if (!ctx) |
b5e95b48 JJ |
1456 | return -ENOMEM; |
1457 | ||
d9087c49 | 1458 | cred_label(cred) = aa_get_label(ns_unconfined(root_ns)); |
f175221a | 1459 | task_ctx(current) = ctx; |
b5e95b48 JJ |
1460 | |
1461 | return 0; | |
1462 | } | |
1463 | ||
d4669f0b JJ |
1464 | static void destroy_buffers(void) |
1465 | { | |
1466 | u32 i, j; | |
1467 | ||
1468 | for_each_possible_cpu(i) { | |
1469 | for_each_cpu_buffer(j) { | |
1470 | kfree(per_cpu(aa_buffers, i).buf[j]); | |
1471 | per_cpu(aa_buffers, i).buf[j] = NULL; | |
1472 | } | |
1473 | } | |
1474 | } | |
1475 | ||
1476 | static int __init alloc_buffers(void) | |
1477 | { | |
1478 | u32 i, j; | |
1479 | ||
1480 | for_each_possible_cpu(i) { | |
1481 | for_each_cpu_buffer(j) { | |
1482 | char *buffer; | |
1483 | ||
1484 | if (cpu_to_node(i) > num_online_nodes()) | |
1485 | /* fallback to kmalloc for offline nodes */ | |
1486 | buffer = kmalloc(aa_g_path_max, GFP_KERNEL); | |
1487 | else | |
1488 | buffer = kmalloc_node(aa_g_path_max, GFP_KERNEL, | |
1489 | cpu_to_node(i)); | |
1490 | if (!buffer) { | |
1491 | destroy_buffers(); | |
1492 | return -ENOMEM; | |
1493 | } | |
1494 | per_cpu(aa_buffers, i).buf[j] = buffer; | |
1495 | } | |
1496 | } | |
1497 | ||
1498 | return 0; | |
1499 | } | |
1500 | ||
e3ea1ca5 TH |
1501 | #ifdef CONFIG_SYSCTL |
1502 | static int apparmor_dointvec(struct ctl_table *table, int write, | |
1503 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1504 | { | |
1505 | if (!policy_admin_capable(NULL)) | |
1506 | return -EPERM; | |
1507 | if (!apparmor_enabled) | |
1508 | return -EINVAL; | |
1509 | ||
1510 | return proc_dointvec(table, write, buffer, lenp, ppos); | |
1511 | } | |
1512 | ||
1513 | static struct ctl_path apparmor_sysctl_path[] = { | |
1514 | { .procname = "kernel", }, | |
1515 | { } | |
1516 | }; | |
1517 | ||
1518 | static struct ctl_table apparmor_sysctl_table[] = { | |
1519 | { | |
1520 | .procname = "unprivileged_userns_apparmor_policy", | |
1521 | .data = &unprivileged_userns_apparmor_policy, | |
1522 | .maxlen = sizeof(int), | |
1523 | .mode = 0600, | |
1524 | .proc_handler = apparmor_dointvec, | |
1525 | }, | |
1526 | { } | |
1527 | }; | |
1528 | ||
1529 | static int __init apparmor_init_sysctl(void) | |
1530 | { | |
1531 | return register_sysctl_paths(apparmor_sysctl_path, | |
1532 | apparmor_sysctl_table) ? 0 : -ENOMEM; | |
1533 | } | |
1534 | #else | |
1535 | static inline int apparmor_init_sysctl(void) | |
1536 | { | |
1537 | return 0; | |
1538 | } | |
1539 | #endif /* CONFIG_SYSCTL */ | |
1540 | ||
b5e95b48 JJ |
1541 | static int __init apparmor_init(void) |
1542 | { | |
1543 | int error; | |
1544 | ||
b1d9e6b0 | 1545 | if (!apparmor_enabled || !security_module_enable("apparmor")) { |
b5e95b48 | 1546 | aa_info_message("AppArmor disabled by boot time parameter"); |
954317fe | 1547 | apparmor_enabled = false; |
b5e95b48 JJ |
1548 | return 0; |
1549 | } | |
1550 | ||
a4c3f89c JJ |
1551 | aa_secids_init(); |
1552 | ||
11c236b8 JJ |
1553 | error = aa_setup_dfa_engine(); |
1554 | if (error) { | |
1555 | AA_ERROR("Unable to setup dfa engine\n"); | |
1556 | goto alloc_out; | |
1557 | } | |
1558 | ||
b5e95b48 JJ |
1559 | error = aa_alloc_root_ns(); |
1560 | if (error) { | |
1561 | AA_ERROR("Unable to allocate default profile namespace\n"); | |
1562 | goto alloc_out; | |
1563 | } | |
1564 | ||
e3ea1ca5 TH |
1565 | error = apparmor_init_sysctl(); |
1566 | if (error) { | |
1567 | AA_ERROR("Unable to register sysctls\n"); | |
1568 | goto alloc_out; | |
1569 | ||
1570 | } | |
1571 | ||
d4669f0b JJ |
1572 | error = alloc_buffers(); |
1573 | if (error) { | |
1574 | AA_ERROR("Unable to allocate work buffers\n"); | |
1575 | goto buffers_out; | |
1576 | } | |
1577 | ||
55a26ebf | 1578 | error = set_init_ctx(); |
b5e95b48 JJ |
1579 | if (error) { |
1580 | AA_ERROR("Failed to set context on init task\n"); | |
b1d9e6b0 | 1581 | aa_free_root_ns(); |
d4669f0b | 1582 | goto buffers_out; |
b5e95b48 | 1583 | } |
d69dece5 CS |
1584 | security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks), |
1585 | "apparmor"); | |
b5e95b48 JJ |
1586 | |
1587 | /* Report that AppArmor successfully initialized */ | |
1588 | apparmor_initialized = 1; | |
1589 | if (aa_g_profile_mode == APPARMOR_COMPLAIN) | |
1590 | aa_info_message("AppArmor initialized: complain mode enabled"); | |
1591 | else if (aa_g_profile_mode == APPARMOR_KILL) | |
1592 | aa_info_message("AppArmor initialized: kill mode enabled"); | |
1593 | else | |
1594 | aa_info_message("AppArmor initialized"); | |
1595 | ||
1596 | return error; | |
1597 | ||
d4669f0b JJ |
1598 | buffers_out: |
1599 | destroy_buffers(); | |
1600 | ||
b5e95b48 JJ |
1601 | alloc_out: |
1602 | aa_destroy_aafs(); | |
11c236b8 | 1603 | aa_teardown_dfa_engine(); |
b5e95b48 | 1604 | |
954317fe | 1605 | apparmor_enabled = false; |
b5e95b48 | 1606 | return error; |
b5e95b48 JJ |
1607 | } |
1608 | ||
1609 | security_initcall(apparmor_init); |