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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> |
e025be0f | 26 | #include <linux/kmemleak.h> |
b5e95b48 JJ |
27 | #include <net/sock.h> |
28 | ||
29 | #include "include/apparmor.h" | |
30 | #include "include/apparmorfs.h" | |
31 | #include "include/audit.h" | |
32 | #include "include/capability.h" | |
33 | #include "include/context.h" | |
34 | #include "include/file.h" | |
35 | #include "include/ipc.h" | |
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" |
b5e95b48 JJ |
42 | |
43 | /* Flag indicating whether initialization completed */ | |
545de8fe | 44 | int apparmor_initialized; |
b5e95b48 | 45 | |
d4669f0b JJ |
46 | DEFINE_PER_CPU(struct aa_buffers, aa_buffers); |
47 | ||
48 | ||
b5e95b48 JJ |
49 | /* |
50 | * LSM hook functions | |
51 | */ | |
52 | ||
53 | /* | |
637f688d | 54 | * free the associated aa_task_ctx and put its labels |
b5e95b48 JJ |
55 | */ |
56 | static void apparmor_cred_free(struct cred *cred) | |
57 | { | |
55a26ebf JJ |
58 | aa_free_task_context(cred_ctx(cred)); |
59 | cred_ctx(cred) = NULL; | |
b5e95b48 JJ |
60 | } |
61 | ||
62 | /* | |
63 | * allocate the apparmor part of blank credentials | |
64 | */ | |
65 | static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
66 | { | |
67 | /* freed by apparmor_cred_free */ | |
55a26ebf JJ |
68 | struct aa_task_ctx *ctx = aa_alloc_task_context(gfp); |
69 | ||
70 | if (!ctx) | |
b5e95b48 JJ |
71 | return -ENOMEM; |
72 | ||
55a26ebf | 73 | cred_ctx(cred) = ctx; |
b5e95b48 JJ |
74 | return 0; |
75 | } | |
76 | ||
77 | /* | |
55a26ebf | 78 | * prepare new aa_task_ctx for modification by prepare_cred block |
b5e95b48 JJ |
79 | */ |
80 | static int apparmor_cred_prepare(struct cred *new, const struct cred *old, | |
81 | gfp_t gfp) | |
82 | { | |
83 | /* freed by apparmor_cred_free */ | |
55a26ebf JJ |
84 | struct aa_task_ctx *ctx = aa_alloc_task_context(gfp); |
85 | ||
86 | if (!ctx) | |
b5e95b48 JJ |
87 | return -ENOMEM; |
88 | ||
55a26ebf JJ |
89 | aa_dup_task_context(ctx, cred_ctx(old)); |
90 | cred_ctx(new) = ctx; | |
b5e95b48 JJ |
91 | return 0; |
92 | } | |
93 | ||
94 | /* | |
95 | * transfer the apparmor data to a blank set of creds | |
96 | */ | |
97 | static void apparmor_cred_transfer(struct cred *new, const struct cred *old) | |
98 | { | |
55a26ebf JJ |
99 | const struct aa_task_ctx *old_ctx = cred_ctx(old); |
100 | struct aa_task_ctx *new_ctx = cred_ctx(new); | |
b5e95b48 | 101 | |
55a26ebf | 102 | aa_dup_task_context(new_ctx, old_ctx); |
b5e95b48 JJ |
103 | } |
104 | ||
105 | static int apparmor_ptrace_access_check(struct task_struct *child, | |
106 | unsigned int mode) | |
107 | { | |
b2d09ae4 JJ |
108 | struct aa_label *tracer, *tracee; |
109 | int error; | |
110 | ||
111 | tracer = begin_current_label_crit_section(); | |
112 | tracee = aa_get_task_label(child); | |
113 | error = aa_may_ptrace(tracer, tracee, | |
114 | mode == PTRACE_MODE_READ ? AA_PTRACE_READ : AA_PTRACE_TRACE); | |
115 | aa_put_label(tracee); | |
116 | end_current_label_crit_section(tracer); | |
117 | ||
118 | return error; | |
b5e95b48 JJ |
119 | } |
120 | ||
121 | static int apparmor_ptrace_traceme(struct task_struct *parent) | |
122 | { | |
b2d09ae4 JJ |
123 | struct aa_label *tracer, *tracee; |
124 | int error; | |
125 | ||
126 | tracee = begin_current_label_crit_section(); | |
127 | tracer = aa_get_task_label(parent); | |
128 | error = aa_may_ptrace(tracer, tracee, AA_PTRACE_TRACE); | |
129 | aa_put_label(tracer); | |
130 | end_current_label_crit_section(tracee); | |
131 | ||
132 | return error; | |
b5e95b48 JJ |
133 | } |
134 | ||
135 | /* Derived from security/commoncap.c:cap_capget */ | |
136 | static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective, | |
137 | kernel_cap_t *inheritable, kernel_cap_t *permitted) | |
138 | { | |
637f688d | 139 | struct aa_label *label; |
b5e95b48 JJ |
140 | const struct cred *cred; |
141 | ||
142 | rcu_read_lock(); | |
143 | cred = __task_cred(target); | |
637f688d | 144 | label = aa_get_newest_cred_label(cred); |
c70c86c4 | 145 | |
b1d9e6b0 CS |
146 | /* |
147 | * cap_capget is stacked ahead of this and will | |
148 | * initialize effective and permitted. | |
149 | */ | |
c70c86c4 JJ |
150 | if (!unconfined(label)) { |
151 | struct aa_profile *profile; | |
152 | struct label_it i; | |
153 | ||
154 | label_for_each_confined(i, label, profile) { | |
155 | if (COMPLAIN_MODE(profile)) | |
156 | continue; | |
157 | *effective = cap_intersect(*effective, | |
158 | profile->caps.allow); | |
159 | *permitted = cap_intersect(*permitted, | |
160 | profile->caps.allow); | |
161 | } | |
b5e95b48 JJ |
162 | } |
163 | rcu_read_unlock(); | |
637f688d | 164 | aa_put_label(label); |
b5e95b48 JJ |
165 | |
166 | return 0; | |
167 | } | |
168 | ||
6a9de491 EP |
169 | static int apparmor_capable(const struct cred *cred, struct user_namespace *ns, |
170 | int cap, int audit) | |
b5e95b48 | 171 | { |
637f688d | 172 | struct aa_label *label; |
b1d9e6b0 CS |
173 | int error = 0; |
174 | ||
637f688d JJ |
175 | label = aa_get_newest_cred_label(cred); |
176 | if (!unconfined(label)) | |
c70c86c4 | 177 | error = aa_capable(label, cap, audit); |
637f688d | 178 | aa_put_label(label); |
cf797c0e | 179 | |
b5e95b48 JJ |
180 | return error; |
181 | } | |
182 | ||
183 | /** | |
184 | * common_perm - basic common permission check wrapper fn for paths | |
185 | * @op: operation being checked | |
186 | * @path: path to check permission of (NOT NULL) | |
187 | * @mask: requested permissions mask | |
188 | * @cond: conditional info for the permission request (NOT NULL) | |
189 | * | |
190 | * Returns: %0 else error code if error or permission denied | |
191 | */ | |
47f6e5cc | 192 | static int common_perm(const char *op, const struct path *path, u32 mask, |
b5e95b48 JJ |
193 | struct path_cond *cond) |
194 | { | |
637f688d | 195 | struct aa_label *label; |
b5e95b48 JJ |
196 | int error = 0; |
197 | ||
637f688d JJ |
198 | label = __begin_current_label_crit_section(); |
199 | if (!unconfined(label)) | |
aebd873e | 200 | error = aa_path_perm(op, label, path, 0, mask, cond); |
637f688d | 201 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
202 | |
203 | return error; | |
204 | } | |
205 | ||
206 | /** | |
31f75bfe | 207 | * common_perm_cond - common permission wrapper around inode cond |
b5e95b48 | 208 | * @op: operation being checked |
31f75bfe | 209 | * @path: location to check (NOT NULL) |
b5e95b48 | 210 | * @mask: requested permissions mask |
b5e95b48 JJ |
211 | * |
212 | * Returns: %0 else error code if error or permission denied | |
213 | */ | |
31f75bfe | 214 | static int common_perm_cond(const char *op, const struct path *path, u32 mask) |
b5e95b48 | 215 | { |
31f75bfe JJ |
216 | struct path_cond cond = { d_backing_inode(path->dentry)->i_uid, |
217 | d_backing_inode(path->dentry)->i_mode | |
218 | }; | |
b5e95b48 | 219 | |
31f75bfe JJ |
220 | if (!path_mediated_fs(path->dentry)) |
221 | return 0; | |
222 | ||
223 | return common_perm(op, path, mask, &cond); | |
b5e95b48 JJ |
224 | } |
225 | ||
226 | /** | |
31f75bfe | 227 | * common_perm_dir_dentry - common permission wrapper when path is dir, dentry |
b5e95b48 | 228 | * @op: operation being checked |
31f75bfe JJ |
229 | * @dir: directory of the dentry (NOT NULL) |
230 | * @dentry: dentry to check (NOT NULL) | |
b5e95b48 | 231 | * @mask: requested permissions mask |
31f75bfe | 232 | * @cond: conditional info for the permission request (NOT NULL) |
b5e95b48 JJ |
233 | * |
234 | * Returns: %0 else error code if error or permission denied | |
235 | */ | |
31f75bfe JJ |
236 | static int common_perm_dir_dentry(const char *op, const struct path *dir, |
237 | struct dentry *dentry, u32 mask, | |
238 | struct path_cond *cond) | |
b5e95b48 | 239 | { |
31f75bfe | 240 | struct path path = { .mnt = dir->mnt, .dentry = dentry }; |
b5e95b48 | 241 | |
31f75bfe | 242 | return common_perm(op, &path, mask, cond); |
b5e95b48 JJ |
243 | } |
244 | ||
245 | /** | |
246 | * common_perm_rm - common permission wrapper for operations doing rm | |
247 | * @op: operation being checked | |
248 | * @dir: directory that the dentry is in (NOT NULL) | |
249 | * @dentry: dentry being rm'd (NOT NULL) | |
250 | * @mask: requested permission mask | |
251 | * | |
252 | * Returns: %0 else error code if error or permission denied | |
253 | */ | |
47f6e5cc | 254 | static int common_perm_rm(const char *op, const struct path *dir, |
b5e95b48 JJ |
255 | struct dentry *dentry, u32 mask) |
256 | { | |
c6f493d6 | 257 | struct inode *inode = d_backing_inode(dentry); |
b5e95b48 JJ |
258 | struct path_cond cond = { }; |
259 | ||
efeee83a | 260 | if (!inode || !path_mediated_fs(dentry)) |
b5e95b48 JJ |
261 | return 0; |
262 | ||
263 | cond.uid = inode->i_uid; | |
264 | cond.mode = inode->i_mode; | |
265 | ||
266 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
267 | } | |
268 | ||
269 | /** | |
270 | * common_perm_create - common permission wrapper for operations doing create | |
271 | * @op: operation being checked | |
272 | * @dir: directory that dentry will be created in (NOT NULL) | |
273 | * @dentry: dentry to create (NOT NULL) | |
274 | * @mask: request permission mask | |
275 | * @mode: created file mode | |
276 | * | |
277 | * Returns: %0 else error code if error or permission denied | |
278 | */ | |
47f6e5cc | 279 | static int common_perm_create(const char *op, const struct path *dir, |
d6b49f7a | 280 | struct dentry *dentry, u32 mask, umode_t mode) |
b5e95b48 JJ |
281 | { |
282 | struct path_cond cond = { current_fsuid(), mode }; | |
283 | ||
efeee83a | 284 | if (!path_mediated_fs(dir->dentry)) |
b5e95b48 JJ |
285 | return 0; |
286 | ||
287 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
288 | } | |
289 | ||
989f74e0 | 290 | static int apparmor_path_unlink(const struct path *dir, struct dentry *dentry) |
b5e95b48 JJ |
291 | { |
292 | return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE); | |
293 | } | |
294 | ||
d3607752 | 295 | static int apparmor_path_mkdir(const struct path *dir, struct dentry *dentry, |
4572befe | 296 | umode_t mode) |
b5e95b48 JJ |
297 | { |
298 | return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE, | |
299 | S_IFDIR); | |
300 | } | |
301 | ||
989f74e0 | 302 | static int apparmor_path_rmdir(const struct path *dir, struct dentry *dentry) |
b5e95b48 JJ |
303 | { |
304 | return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE); | |
305 | } | |
306 | ||
d3607752 | 307 | static int apparmor_path_mknod(const struct path *dir, struct dentry *dentry, |
04fc66e7 | 308 | umode_t mode, unsigned int dev) |
b5e95b48 JJ |
309 | { |
310 | return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode); | |
311 | } | |
312 | ||
81f4c506 | 313 | static int apparmor_path_truncate(const struct path *path) |
b5e95b48 | 314 | { |
e53cfe6c | 315 | return common_perm_cond(OP_TRUNC, path, MAY_WRITE | AA_MAY_SETATTR); |
b5e95b48 JJ |
316 | } |
317 | ||
d3607752 | 318 | static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry, |
b5e95b48 JJ |
319 | const char *old_name) |
320 | { | |
321 | return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE, | |
322 | S_IFLNK); | |
323 | } | |
324 | ||
3ccee46a | 325 | static int apparmor_path_link(struct dentry *old_dentry, const struct path *new_dir, |
b5e95b48 JJ |
326 | struct dentry *new_dentry) |
327 | { | |
637f688d | 328 | struct aa_label *label; |
b5e95b48 JJ |
329 | int error = 0; |
330 | ||
efeee83a | 331 | if (!path_mediated_fs(old_dentry)) |
b5e95b48 JJ |
332 | return 0; |
333 | ||
637f688d JJ |
334 | label = begin_current_label_crit_section(); |
335 | if (!unconfined(label)) | |
8014370f | 336 | error = aa_path_link(label, old_dentry, new_dir, new_dentry); |
637f688d | 337 | end_current_label_crit_section(label); |
cf797c0e | 338 | |
b5e95b48 JJ |
339 | return error; |
340 | } | |
341 | ||
3ccee46a AV |
342 | static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry, |
343 | const struct path *new_dir, struct dentry *new_dentry) | |
b5e95b48 | 344 | { |
637f688d | 345 | struct aa_label *label; |
b5e95b48 JJ |
346 | int error = 0; |
347 | ||
efeee83a | 348 | if (!path_mediated_fs(old_dentry)) |
b5e95b48 JJ |
349 | return 0; |
350 | ||
637f688d JJ |
351 | label = begin_current_label_crit_section(); |
352 | if (!unconfined(label)) { | |
8486adf0 KC |
353 | struct path old_path = { .mnt = old_dir->mnt, |
354 | .dentry = old_dentry }; | |
355 | struct path new_path = { .mnt = new_dir->mnt, | |
356 | .dentry = new_dentry }; | |
c6f493d6 DH |
357 | struct path_cond cond = { d_backing_inode(old_dentry)->i_uid, |
358 | d_backing_inode(old_dentry)->i_mode | |
b5e95b48 JJ |
359 | }; |
360 | ||
aebd873e | 361 | error = aa_path_perm(OP_RENAME_SRC, label, &old_path, 0, |
e53cfe6c JJ |
362 | MAY_READ | AA_MAY_GETATTR | MAY_WRITE | |
363 | AA_MAY_SETATTR | AA_MAY_DELETE, | |
b5e95b48 JJ |
364 | &cond); |
365 | if (!error) | |
aebd873e | 366 | error = aa_path_perm(OP_RENAME_DEST, label, &new_path, |
e53cfe6c | 367 | 0, MAY_WRITE | AA_MAY_SETATTR | |
b5e95b48 JJ |
368 | AA_MAY_CREATE, &cond); |
369 | ||
370 | } | |
637f688d | 371 | end_current_label_crit_section(label); |
cf797c0e | 372 | |
b5e95b48 JJ |
373 | return error; |
374 | } | |
375 | ||
be01f9f2 | 376 | static int apparmor_path_chmod(const struct path *path, umode_t mode) |
b5e95b48 | 377 | { |
31f75bfe | 378 | return common_perm_cond(OP_CHMOD, path, AA_MAY_CHMOD); |
b5e95b48 JJ |
379 | } |
380 | ||
7fd25dac | 381 | static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid) |
b5e95b48 | 382 | { |
31f75bfe | 383 | return common_perm_cond(OP_CHOWN, path, AA_MAY_CHOWN); |
b5e95b48 JJ |
384 | } |
385 | ||
3f7036a0 | 386 | static int apparmor_inode_getattr(const struct path *path) |
b5e95b48 | 387 | { |
e53cfe6c | 388 | return common_perm_cond(OP_GETATTR, path, AA_MAY_GETATTR); |
b5e95b48 JJ |
389 | } |
390 | ||
83d49856 | 391 | static int apparmor_file_open(struct file *file, const struct cred *cred) |
b5e95b48 | 392 | { |
637f688d JJ |
393 | struct aa_file_ctx *fctx = file_ctx(file); |
394 | struct aa_label *label; | |
b5e95b48 JJ |
395 | int error = 0; |
396 | ||
efeee83a | 397 | if (!path_mediated_fs(file->f_path.dentry)) |
b5e95b48 JJ |
398 | return 0; |
399 | ||
400 | /* If in exec, permission is handled by bprm hooks. | |
401 | * Cache permissions granted by the previous exec check, with | |
402 | * implicit read and executable mmap which are required to | |
403 | * actually execute the image. | |
404 | */ | |
405 | if (current->in_execve) { | |
55a26ebf | 406 | fctx->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP; |
b5e95b48 JJ |
407 | return 0; |
408 | } | |
409 | ||
637f688d JJ |
410 | label = aa_get_newest_cred_label(cred); |
411 | if (!unconfined(label)) { | |
496ad9aa | 412 | struct inode *inode = file_inode(file); |
b5e95b48 JJ |
413 | struct path_cond cond = { inode->i_uid, inode->i_mode }; |
414 | ||
aebd873e | 415 | error = aa_path_perm(OP_OPEN, label, &file->f_path, 0, |
b5e95b48 JJ |
416 | aa_map_file_to_perms(file), &cond); |
417 | /* todo cache full allowed permissions set and state */ | |
55a26ebf | 418 | fctx->allow = aa_map_file_to_perms(file); |
b5e95b48 | 419 | } |
637f688d | 420 | aa_put_label(label); |
b5e95b48 JJ |
421 | |
422 | return error; | |
423 | } | |
424 | ||
425 | static int apparmor_file_alloc_security(struct file *file) | |
426 | { | |
cf797c0e JJ |
427 | int error = 0; |
428 | ||
b5e95b48 | 429 | /* freed by apparmor_file_free_security */ |
637f688d | 430 | struct aa_label *label = begin_current_label_crit_section(); |
190a9518 | 431 | file->f_security = aa_alloc_file_ctx(label, GFP_KERNEL); |
2835a13b JJ |
432 | if (!file_ctx(file)) |
433 | error = -ENOMEM; | |
637f688d | 434 | end_current_label_crit_section(label); |
b5e95b48 | 435 | |
cf797c0e | 436 | return error; |
b5e95b48 JJ |
437 | } |
438 | ||
439 | static void apparmor_file_free_security(struct file *file) | |
440 | { | |
2835a13b | 441 | aa_free_file_ctx(file_ctx(file)); |
b5e95b48 JJ |
442 | } |
443 | ||
47f6e5cc | 444 | static int common_file_perm(const char *op, struct file *file, u32 mask) |
b5e95b48 | 445 | { |
190a9518 | 446 | struct aa_label *label; |
b5e95b48 JJ |
447 | int error = 0; |
448 | ||
192ca6b5 JJ |
449 | /* don't reaudit files closed during inheritance */ |
450 | if (file->f_path.dentry == aa_null.dentry) | |
451 | return -EACCES; | |
452 | ||
637f688d | 453 | label = __begin_current_label_crit_section(); |
190a9518 | 454 | error = aa_file_perm(op, label, file, mask); |
637f688d | 455 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
456 | |
457 | return error; | |
458 | } | |
459 | ||
064dc947 JJ |
460 | static int apparmor_file_receive(struct file *file) |
461 | { | |
462 | return common_file_perm(OP_FRECEIVE, file, aa_map_file_to_perms(file)); | |
463 | } | |
464 | ||
b5e95b48 JJ |
465 | static int apparmor_file_permission(struct file *file, int mask) |
466 | { | |
467 | return common_file_perm(OP_FPERM, file, mask); | |
468 | } | |
469 | ||
470 | static int apparmor_file_lock(struct file *file, unsigned int cmd) | |
471 | { | |
472 | u32 mask = AA_MAY_LOCK; | |
473 | ||
474 | if (cmd == F_WRLCK) | |
475 | mask |= MAY_WRITE; | |
476 | ||
477 | return common_file_perm(OP_FLOCK, file, mask); | |
478 | } | |
479 | ||
47f6e5cc | 480 | static int common_mmap(const char *op, struct file *file, unsigned long prot, |
b5e95b48 JJ |
481 | unsigned long flags) |
482 | { | |
b5e95b48 JJ |
483 | int mask = 0; |
484 | ||
637f688d | 485 | if (!file || !file_ctx(file)) |
b5e95b48 JJ |
486 | return 0; |
487 | ||
488 | if (prot & PROT_READ) | |
489 | mask |= MAY_READ; | |
490 | /* | |
491 | * Private mappings don't require write perms since they don't | |
492 | * write back to the files | |
493 | */ | |
494 | if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE)) | |
495 | mask |= MAY_WRITE; | |
496 | if (prot & PROT_EXEC) | |
497 | mask |= AA_EXEC_MMAP; | |
498 | ||
b5e95b48 JJ |
499 | return common_file_perm(op, file, mask); |
500 | } | |
501 | ||
e5467859 AV |
502 | static int apparmor_mmap_file(struct file *file, unsigned long reqprot, |
503 | unsigned long prot, unsigned long flags) | |
b5e95b48 | 504 | { |
b5e95b48 JJ |
505 | return common_mmap(OP_FMMAP, file, prot, flags); |
506 | } | |
507 | ||
508 | static int apparmor_file_mprotect(struct vm_area_struct *vma, | |
509 | unsigned long reqprot, unsigned long prot) | |
510 | { | |
511 | return common_mmap(OP_FMPROT, vma->vm_file, prot, | |
512 | !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0); | |
513 | } | |
514 | ||
2ea3ffb7 JJ |
515 | static int apparmor_sb_mount(const char *dev_name, const struct path *path, |
516 | const char *type, unsigned long flags, void *data) | |
517 | { | |
518 | struct aa_label *label; | |
519 | int error = 0; | |
520 | ||
521 | /* Discard magic */ | |
522 | if ((flags & MS_MGC_MSK) == MS_MGC_VAL) | |
523 | flags &= ~MS_MGC_MSK; | |
524 | ||
525 | flags &= ~AA_MS_IGNORE_MASK; | |
526 | ||
527 | label = __begin_current_label_crit_section(); | |
528 | if (!unconfined(label)) { | |
529 | if (flags & MS_REMOUNT) | |
530 | error = aa_remount(label, path, flags, data); | |
531 | else if (flags & MS_BIND) | |
532 | error = aa_bind_mount(label, path, dev_name, flags); | |
533 | else if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE | | |
534 | MS_UNBINDABLE)) | |
535 | error = aa_mount_change_type(label, path, flags); | |
536 | else if (flags & MS_MOVE) | |
537 | error = aa_move_mount(label, path, dev_name); | |
538 | else | |
539 | error = aa_new_mount(label, dev_name, path, type, | |
540 | flags, data); | |
541 | } | |
542 | __end_current_label_crit_section(label); | |
543 | ||
544 | return error; | |
545 | } | |
546 | ||
547 | static int apparmor_sb_umount(struct vfsmount *mnt, int flags) | |
548 | { | |
549 | struct aa_label *label; | |
550 | int error = 0; | |
551 | ||
552 | label = __begin_current_label_crit_section(); | |
553 | if (!unconfined(label)) | |
554 | error = aa_umount(label, mnt, flags); | |
555 | __end_current_label_crit_section(label); | |
556 | ||
557 | return error; | |
558 | } | |
559 | ||
560 | static int apparmor_sb_pivotroot(const struct path *old_path, | |
561 | const struct path *new_path) | |
562 | { | |
563 | struct aa_label *label; | |
564 | int error = 0; | |
565 | ||
566 | label = aa_get_current_label(); | |
567 | if (!unconfined(label)) | |
568 | error = aa_pivotroot(label, old_path, new_path); | |
569 | aa_put_label(label); | |
570 | ||
571 | return error; | |
572 | } | |
573 | ||
b5e95b48 JJ |
574 | static int apparmor_getprocattr(struct task_struct *task, char *name, |
575 | char **value) | |
576 | { | |
577 | int error = -ENOENT; | |
b5e95b48 JJ |
578 | /* released below */ |
579 | const struct cred *cred = get_task_cred(task); | |
55a26ebf | 580 | struct aa_task_ctx *ctx = cred_ctx(cred); |
637f688d | 581 | struct aa_label *label = NULL; |
b5e95b48 JJ |
582 | |
583 | if (strcmp(name, "current") == 0) | |
637f688d | 584 | label = aa_get_newest_label(ctx->label); |
55a26ebf | 585 | else if (strcmp(name, "prev") == 0 && ctx->previous) |
637f688d | 586 | label = aa_get_newest_label(ctx->previous); |
55a26ebf | 587 | else if (strcmp(name, "exec") == 0 && ctx->onexec) |
637f688d | 588 | label = aa_get_newest_label(ctx->onexec); |
b5e95b48 JJ |
589 | else |
590 | error = -EINVAL; | |
591 | ||
637f688d | 592 | if (label) |
76a1d263 | 593 | error = aa_getprocattr(label, value); |
77b071b3 | 594 | |
637f688d | 595 | aa_put_label(label); |
b5e95b48 JJ |
596 | put_cred(cred); |
597 | ||
598 | return error; | |
599 | } | |
600 | ||
b21507e2 SS |
601 | static int apparmor_setprocattr(const char *name, void *value, |
602 | size_t size) | |
b5e95b48 | 603 | { |
e89b8081 | 604 | char *command, *largs = NULL, *args = value; |
b5e95b48 JJ |
605 | size_t arg_size; |
606 | int error; | |
ef88a7ac | 607 | DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SETPROCATTR); |
b5e95b48 JJ |
608 | |
609 | if (size == 0) | |
610 | return -EINVAL; | |
b5e95b48 | 611 | |
e89b8081 VN |
612 | /* AppArmor requires that the buffer must be null terminated atm */ |
613 | if (args[size - 1] != '\0') { | |
614 | /* null terminate */ | |
615 | largs = args = kmalloc(size + 1, GFP_KERNEL); | |
616 | if (!args) | |
617 | return -ENOMEM; | |
618 | memcpy(args, value, size); | |
619 | args[size] = '\0'; | |
620 | } | |
621 | ||
622 | error = -EINVAL; | |
b5e95b48 JJ |
623 | args = strim(args); |
624 | command = strsep(&args, " "); | |
625 | if (!args) | |
e89b8081 | 626 | goto out; |
b5e95b48 JJ |
627 | args = skip_spaces(args); |
628 | if (!*args) | |
e89b8081 | 629 | goto out; |
b5e95b48 | 630 | |
d4d03f74 | 631 | arg_size = size - (args - (largs ? largs : (char *) value)); |
b5e95b48 JJ |
632 | if (strcmp(name, "current") == 0) { |
633 | if (strcmp(command, "changehat") == 0) { | |
634 | error = aa_setprocattr_changehat(args, arg_size, | |
df8073c6 | 635 | AA_CHANGE_NOFLAGS); |
b5e95b48 JJ |
636 | } else if (strcmp(command, "permhat") == 0) { |
637 | error = aa_setprocattr_changehat(args, arg_size, | |
df8073c6 | 638 | AA_CHANGE_TEST); |
b5e95b48 | 639 | } else if (strcmp(command, "changeprofile") == 0) { |
df8073c6 | 640 | error = aa_change_profile(args, AA_CHANGE_NOFLAGS); |
b5e95b48 | 641 | } else if (strcmp(command, "permprofile") == 0) { |
df8073c6 | 642 | error = aa_change_profile(args, AA_CHANGE_TEST); |
6c5fc8f1 JJ |
643 | } else if (strcmp(command, "stack") == 0) { |
644 | error = aa_change_profile(args, AA_CHANGE_STACK); | |
3eea57c2 JJ |
645 | } else |
646 | goto fail; | |
b5e95b48 | 647 | } else if (strcmp(name, "exec") == 0) { |
3eea57c2 | 648 | if (strcmp(command, "exec") == 0) |
df8073c6 | 649 | error = aa_change_profile(args, AA_CHANGE_ONEXEC); |
6c5fc8f1 JJ |
650 | else if (strcmp(command, "stack") == 0) |
651 | error = aa_change_profile(args, (AA_CHANGE_ONEXEC | | |
652 | AA_CHANGE_STACK)); | |
3eea57c2 JJ |
653 | else |
654 | goto fail; | |
655 | } else | |
b5e95b48 | 656 | /* only support the "current" and "exec" process attributes */ |
e89b8081 | 657 | goto fail; |
3eea57c2 | 658 | |
b5e95b48 JJ |
659 | if (!error) |
660 | error = size; | |
e89b8081 VN |
661 | out: |
662 | kfree(largs); | |
b5e95b48 | 663 | return error; |
3eea57c2 JJ |
664 | |
665 | fail: | |
637f688d | 666 | aad(&sa)->label = begin_current_label_crit_section(); |
ef88a7ac JJ |
667 | aad(&sa)->info = name; |
668 | aad(&sa)->error = error = -EINVAL; | |
3eea57c2 | 669 | aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL); |
637f688d | 670 | end_current_label_crit_section(aad(&sa)->label); |
e89b8081 | 671 | goto out; |
b5e95b48 JJ |
672 | } |
673 | ||
fe864821 JJ |
674 | /** |
675 | * apparmor_bprm_committing_creds - do task cleanup on committing new creds | |
676 | * @bprm: binprm for the exec (NOT NULL) | |
677 | */ | |
678 | static void apparmor_bprm_committing_creds(struct linux_binprm *bprm) | |
679 | { | |
637f688d | 680 | struct aa_label *label = aa_current_raw_label(); |
fe864821 JJ |
681 | struct aa_task_ctx *new_ctx = cred_ctx(bprm->cred); |
682 | ||
683 | /* bail out if unconfined or not changing profile */ | |
637f688d JJ |
684 | if ((new_ctx->label->proxy == label->proxy) || |
685 | (unconfined(new_ctx->label))) | |
fe864821 JJ |
686 | return; |
687 | ||
192ca6b5 JJ |
688 | aa_inherit_files(bprm->cred, current->files); |
689 | ||
fe864821 JJ |
690 | current->pdeath_signal = 0; |
691 | ||
637f688d | 692 | /* reset soft limits and set hard limits for the new label */ |
86b92cb7 | 693 | __aa_transition_rlimits(label, new_ctx->label); |
fe864821 JJ |
694 | } |
695 | ||
696 | /** | |
697 | * apparmor_bprm_committed_cred - do cleanup after new creds committed | |
698 | * @bprm: binprm for the exec (NOT NULL) | |
699 | */ | |
700 | static void apparmor_bprm_committed_creds(struct linux_binprm *bprm) | |
701 | { | |
702 | /* TODO: cleanup signals - ipc mediation */ | |
703 | return; | |
704 | } | |
705 | ||
7cb4dc9f JS |
706 | static int apparmor_task_setrlimit(struct task_struct *task, |
707 | unsigned int resource, struct rlimit *new_rlim) | |
b5e95b48 | 708 | { |
637f688d | 709 | struct aa_label *label = __begin_current_label_crit_section(); |
b5e95b48 JJ |
710 | int error = 0; |
711 | ||
637f688d | 712 | if (!unconfined(label)) |
86b92cb7 | 713 | error = aa_task_setrlimit(label, task, resource, new_rlim); |
637f688d | 714 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
715 | |
716 | return error; | |
717 | } | |
718 | ||
cd1dbf76 JJ |
719 | static int apparmor_task_kill(struct task_struct *target, struct siginfo *info, |
720 | int sig, u32 secid) | |
721 | { | |
722 | struct aa_label *cl, *tl; | |
723 | int error; | |
724 | ||
725 | if (secid) | |
726 | /* TODO: after secid to label mapping is done. | |
727 | * Dealing with USB IO specific behavior | |
728 | */ | |
729 | return 0; | |
730 | cl = __begin_current_label_crit_section(); | |
731 | tl = aa_get_task_label(target); | |
732 | error = aa_may_signal(cl, tl, sig); | |
733 | aa_put_label(tl); | |
734 | __end_current_label_crit_section(cl); | |
735 | ||
736 | return error; | |
737 | } | |
738 | ||
ca97d939 | 739 | static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = { |
e20b043a CS |
740 | LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check), |
741 | LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme), | |
742 | LSM_HOOK_INIT(capget, apparmor_capget), | |
743 | LSM_HOOK_INIT(capable, apparmor_capable), | |
744 | ||
2ea3ffb7 JJ |
745 | LSM_HOOK_INIT(sb_mount, apparmor_sb_mount), |
746 | LSM_HOOK_INIT(sb_umount, apparmor_sb_umount), | |
747 | LSM_HOOK_INIT(sb_pivotroot, apparmor_sb_pivotroot), | |
748 | ||
e20b043a CS |
749 | LSM_HOOK_INIT(path_link, apparmor_path_link), |
750 | LSM_HOOK_INIT(path_unlink, apparmor_path_unlink), | |
751 | LSM_HOOK_INIT(path_symlink, apparmor_path_symlink), | |
752 | LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir), | |
753 | LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir), | |
754 | LSM_HOOK_INIT(path_mknod, apparmor_path_mknod), | |
755 | LSM_HOOK_INIT(path_rename, apparmor_path_rename), | |
756 | LSM_HOOK_INIT(path_chmod, apparmor_path_chmod), | |
757 | LSM_HOOK_INIT(path_chown, apparmor_path_chown), | |
758 | LSM_HOOK_INIT(path_truncate, apparmor_path_truncate), | |
759 | LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr), | |
760 | ||
761 | LSM_HOOK_INIT(file_open, apparmor_file_open), | |
064dc947 | 762 | LSM_HOOK_INIT(file_receive, apparmor_file_receive), |
e20b043a CS |
763 | LSM_HOOK_INIT(file_permission, apparmor_file_permission), |
764 | LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security), | |
765 | LSM_HOOK_INIT(file_free_security, apparmor_file_free_security), | |
766 | LSM_HOOK_INIT(mmap_file, apparmor_mmap_file), | |
e20b043a CS |
767 | LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect), |
768 | LSM_HOOK_INIT(file_lock, apparmor_file_lock), | |
769 | ||
770 | LSM_HOOK_INIT(getprocattr, apparmor_getprocattr), | |
771 | LSM_HOOK_INIT(setprocattr, apparmor_setprocattr), | |
772 | ||
773 | LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank), | |
774 | LSM_HOOK_INIT(cred_free, apparmor_cred_free), | |
775 | LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare), | |
776 | LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer), | |
777 | ||
778 | LSM_HOOK_INIT(bprm_set_creds, apparmor_bprm_set_creds), | |
779 | LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds), | |
780 | LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds), | |
e20b043a CS |
781 | |
782 | LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit), | |
cd1dbf76 | 783 | LSM_HOOK_INIT(task_kill, apparmor_task_kill), |
b5e95b48 JJ |
784 | }; |
785 | ||
786 | /* | |
787 | * AppArmor sysfs module parameters | |
788 | */ | |
789 | ||
101d6c82 SR |
790 | static int param_set_aabool(const char *val, const struct kernel_param *kp); |
791 | static int param_get_aabool(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 792 | #define param_check_aabool param_check_bool |
9c27847d | 793 | static const struct kernel_param_ops param_ops_aabool = { |
6a4c2643 | 794 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
795 | .set = param_set_aabool, |
796 | .get = param_get_aabool | |
797 | }; | |
b5e95b48 | 798 | |
101d6c82 SR |
799 | static int param_set_aauint(const char *val, const struct kernel_param *kp); |
800 | static int param_get_aauint(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 801 | #define param_check_aauint param_check_uint |
9c27847d | 802 | static const struct kernel_param_ops param_ops_aauint = { |
101d6c82 SR |
803 | .set = param_set_aauint, |
804 | .get = param_get_aauint | |
805 | }; | |
b5e95b48 | 806 | |
101d6c82 SR |
807 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp); |
808 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 809 | #define param_check_aalockpolicy param_check_bool |
9c27847d | 810 | static const struct kernel_param_ops param_ops_aalockpolicy = { |
6a4c2643 | 811 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
812 | .set = param_set_aalockpolicy, |
813 | .get = param_get_aalockpolicy | |
814 | }; | |
b5e95b48 | 815 | |
e4dca7b7 KC |
816 | static int param_set_audit(const char *val, const struct kernel_param *kp); |
817 | static int param_get_audit(char *buffer, const struct kernel_param *kp); | |
b5e95b48 | 818 | |
e4dca7b7 KC |
819 | static int param_set_mode(const char *val, const struct kernel_param *kp); |
820 | static int param_get_mode(char *buffer, const struct kernel_param *kp); | |
b5e95b48 JJ |
821 | |
822 | /* Flag values, also controllable via /sys/module/apparmor/parameters | |
823 | * We define special types as we want to do additional mediation. | |
824 | */ | |
825 | ||
826 | /* AppArmor global enforcement switch - complain, enforce, kill */ | |
827 | enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE; | |
828 | module_param_call(mode, param_set_mode, param_get_mode, | |
829 | &aa_g_profile_mode, S_IRUSR | S_IWUSR); | |
830 | ||
6059f71f | 831 | /* whether policy verification hashing is enabled */ |
7616ac70 | 832 | bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT); |
3ccb76c5 | 833 | #ifdef CONFIG_SECURITY_APPARMOR_HASH |
6059f71f | 834 | module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR); |
7616ac70 | 835 | #endif |
6059f71f | 836 | |
b5e95b48 | 837 | /* Debug mode */ |
eea7a05f | 838 | bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_APPARMOR_DEBUG_MESSAGES); |
b5e95b48 JJ |
839 | module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR); |
840 | ||
841 | /* Audit mode */ | |
842 | enum audit_mode aa_g_audit; | |
843 | module_param_call(audit, param_set_audit, param_get_audit, | |
844 | &aa_g_audit, S_IRUSR | S_IWUSR); | |
845 | ||
846 | /* Determines if audit header is included in audited messages. This | |
847 | * provides more context if the audit daemon is not running | |
848 | */ | |
954317fe | 849 | bool aa_g_audit_header = true; |
b5e95b48 JJ |
850 | module_param_named(audit_header, aa_g_audit_header, aabool, |
851 | S_IRUSR | S_IWUSR); | |
852 | ||
853 | /* lock out loading/removal of policy | |
854 | * TODO: add in at boot loading of policy, which is the only way to | |
855 | * load policy, if lock_policy is set | |
856 | */ | |
90ab5ee9 | 857 | bool aa_g_lock_policy; |
b5e95b48 JJ |
858 | module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy, |
859 | S_IRUSR | S_IWUSR); | |
860 | ||
861 | /* Syscall logging mode */ | |
90ab5ee9 | 862 | bool aa_g_logsyscall; |
b5e95b48 JJ |
863 | module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR); |
864 | ||
865 | /* Maximum pathname length before accesses will start getting rejected */ | |
866 | unsigned int aa_g_path_max = 2 * PATH_MAX; | |
622f6e32 | 867 | module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR); |
b5e95b48 JJ |
868 | |
869 | /* Determines how paranoid loading of policy is and how much verification | |
870 | * on the loaded policy is done. | |
abbf8734 JJ |
871 | * DEPRECATED: read only as strict checking of load is always done now |
872 | * that none root users (user namespaces) can load policy. | |
b5e95b48 | 873 | */ |
954317fe | 874 | bool aa_g_paranoid_load = true; |
abbf8734 | 875 | module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO); |
b5e95b48 JJ |
876 | |
877 | /* Boot time disable flag */ | |
90ab5ee9 | 878 | static bool apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE; |
c611616c | 879 | module_param_named(enabled, apparmor_enabled, bool, S_IRUGO); |
b5e95b48 JJ |
880 | |
881 | static int __init apparmor_enabled_setup(char *str) | |
882 | { | |
883 | unsigned long enabled; | |
29707b20 | 884 | int error = kstrtoul(str, 0, &enabled); |
b5e95b48 JJ |
885 | if (!error) |
886 | apparmor_enabled = enabled ? 1 : 0; | |
887 | return 1; | |
888 | } | |
889 | ||
890 | __setup("apparmor=", apparmor_enabled_setup); | |
891 | ||
892 | /* set global flag turning off the ability to load policy */ | |
101d6c82 | 893 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp) |
b5e95b48 | 894 | { |
545de8fe JJ |
895 | if (!apparmor_enabled) |
896 | return -EINVAL; | |
897 | if (apparmor_initialized && !policy_admin_capable(NULL)) | |
b5e95b48 | 898 | return -EPERM; |
b5e95b48 JJ |
899 | return param_set_bool(val, kp); |
900 | } | |
901 | ||
101d6c82 | 902 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 903 | { |
ca4bd5ae JJ |
904 | if (!apparmor_enabled) |
905 | return -EINVAL; | |
545de8fe JJ |
906 | if (apparmor_initialized && !policy_view_capable(NULL)) |
907 | return -EPERM; | |
b5e95b48 JJ |
908 | return param_get_bool(buffer, kp); |
909 | } | |
910 | ||
101d6c82 | 911 | static int param_set_aabool(const char *val, const struct kernel_param *kp) |
b5e95b48 | 912 | { |
ca4bd5ae JJ |
913 | if (!apparmor_enabled) |
914 | return -EINVAL; | |
545de8fe JJ |
915 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
916 | return -EPERM; | |
b5e95b48 JJ |
917 | return param_set_bool(val, kp); |
918 | } | |
919 | ||
101d6c82 | 920 | static int param_get_aabool(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 921 | { |
ca4bd5ae JJ |
922 | if (!apparmor_enabled) |
923 | return -EINVAL; | |
545de8fe JJ |
924 | if (apparmor_initialized && !policy_view_capable(NULL)) |
925 | return -EPERM; | |
b5e95b48 JJ |
926 | return param_get_bool(buffer, kp); |
927 | } | |
928 | ||
101d6c82 | 929 | static int param_set_aauint(const char *val, const struct kernel_param *kp) |
b5e95b48 | 930 | { |
39d84824 JJ |
931 | int error; |
932 | ||
ca4bd5ae JJ |
933 | if (!apparmor_enabled) |
934 | return -EINVAL; | |
39d84824 JJ |
935 | /* file is ro but enforce 2nd line check */ |
936 | if (apparmor_initialized) | |
545de8fe | 937 | return -EPERM; |
39d84824 JJ |
938 | |
939 | error = param_set_uint(val, kp); | |
940 | pr_info("AppArmor: buffer size set to %d bytes\n", aa_g_path_max); | |
941 | ||
942 | return error; | |
b5e95b48 JJ |
943 | } |
944 | ||
101d6c82 | 945 | static int param_get_aauint(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 946 | { |
ca4bd5ae JJ |
947 | if (!apparmor_enabled) |
948 | return -EINVAL; | |
545de8fe JJ |
949 | if (apparmor_initialized && !policy_view_capable(NULL)) |
950 | return -EPERM; | |
b5e95b48 JJ |
951 | return param_get_uint(buffer, kp); |
952 | } | |
953 | ||
e4dca7b7 | 954 | static int param_get_audit(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 955 | { |
b5e95b48 JJ |
956 | if (!apparmor_enabled) |
957 | return -EINVAL; | |
545de8fe JJ |
958 | if (apparmor_initialized && !policy_view_capable(NULL)) |
959 | return -EPERM; | |
b5e95b48 JJ |
960 | return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]); |
961 | } | |
962 | ||
e4dca7b7 | 963 | static int param_set_audit(const char *val, const struct kernel_param *kp) |
b5e95b48 JJ |
964 | { |
965 | int i; | |
b5e95b48 JJ |
966 | |
967 | if (!apparmor_enabled) | |
968 | return -EINVAL; | |
b5e95b48 JJ |
969 | if (!val) |
970 | return -EINVAL; | |
545de8fe JJ |
971 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
972 | return -EPERM; | |
b5e95b48 JJ |
973 | |
974 | for (i = 0; i < AUDIT_MAX_INDEX; i++) { | |
975 | if (strcmp(val, audit_mode_names[i]) == 0) { | |
976 | aa_g_audit = i; | |
977 | return 0; | |
978 | } | |
979 | } | |
980 | ||
981 | return -EINVAL; | |
982 | } | |
983 | ||
e4dca7b7 | 984 | static int param_get_mode(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 985 | { |
b5e95b48 JJ |
986 | if (!apparmor_enabled) |
987 | return -EINVAL; | |
545de8fe JJ |
988 | if (apparmor_initialized && !policy_view_capable(NULL)) |
989 | return -EPERM; | |
b5e95b48 | 990 | |
0d259f04 | 991 | return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]); |
b5e95b48 JJ |
992 | } |
993 | ||
e4dca7b7 | 994 | static int param_set_mode(const char *val, const struct kernel_param *kp) |
b5e95b48 JJ |
995 | { |
996 | int i; | |
b5e95b48 JJ |
997 | |
998 | if (!apparmor_enabled) | |
999 | return -EINVAL; | |
b5e95b48 JJ |
1000 | if (!val) |
1001 | return -EINVAL; | |
545de8fe JJ |
1002 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
1003 | return -EPERM; | |
b5e95b48 | 1004 | |
0d259f04 JJ |
1005 | for (i = 0; i < APPARMOR_MODE_NAMES_MAX_INDEX; i++) { |
1006 | if (strcmp(val, aa_profile_mode_names[i]) == 0) { | |
b5e95b48 JJ |
1007 | aa_g_profile_mode = i; |
1008 | return 0; | |
1009 | } | |
1010 | } | |
1011 | ||
1012 | return -EINVAL; | |
1013 | } | |
1014 | ||
1015 | /* | |
1016 | * AppArmor init functions | |
1017 | */ | |
1018 | ||
1019 | /** | |
55a26ebf | 1020 | * set_init_ctx - set a task context and profile on the first task. |
b5e95b48 JJ |
1021 | * |
1022 | * TODO: allow setting an alternate profile than unconfined | |
1023 | */ | |
55a26ebf | 1024 | static int __init set_init_ctx(void) |
b5e95b48 JJ |
1025 | { |
1026 | struct cred *cred = (struct cred *)current->real_cred; | |
55a26ebf | 1027 | struct aa_task_ctx *ctx; |
b5e95b48 | 1028 | |
55a26ebf JJ |
1029 | ctx = aa_alloc_task_context(GFP_KERNEL); |
1030 | if (!ctx) | |
b5e95b48 JJ |
1031 | return -ENOMEM; |
1032 | ||
637f688d | 1033 | ctx->label = aa_get_label(ns_unconfined(root_ns)); |
55a26ebf | 1034 | cred_ctx(cred) = ctx; |
b5e95b48 JJ |
1035 | |
1036 | return 0; | |
1037 | } | |
1038 | ||
d4669f0b JJ |
1039 | static void destroy_buffers(void) |
1040 | { | |
1041 | u32 i, j; | |
1042 | ||
1043 | for_each_possible_cpu(i) { | |
1044 | for_each_cpu_buffer(j) { | |
1045 | kfree(per_cpu(aa_buffers, i).buf[j]); | |
1046 | per_cpu(aa_buffers, i).buf[j] = NULL; | |
1047 | } | |
1048 | } | |
1049 | } | |
1050 | ||
1051 | static int __init alloc_buffers(void) | |
1052 | { | |
1053 | u32 i, j; | |
1054 | ||
1055 | for_each_possible_cpu(i) { | |
1056 | for_each_cpu_buffer(j) { | |
1057 | char *buffer; | |
1058 | ||
1059 | if (cpu_to_node(i) > num_online_nodes()) | |
1060 | /* fallback to kmalloc for offline nodes */ | |
1061 | buffer = kmalloc(aa_g_path_max, GFP_KERNEL); | |
1062 | else | |
1063 | buffer = kmalloc_node(aa_g_path_max, GFP_KERNEL, | |
1064 | cpu_to_node(i)); | |
1065 | if (!buffer) { | |
1066 | destroy_buffers(); | |
1067 | return -ENOMEM; | |
1068 | } | |
1069 | per_cpu(aa_buffers, i).buf[j] = buffer; | |
1070 | } | |
1071 | } | |
1072 | ||
1073 | return 0; | |
1074 | } | |
1075 | ||
e3ea1ca5 TH |
1076 | #ifdef CONFIG_SYSCTL |
1077 | static int apparmor_dointvec(struct ctl_table *table, int write, | |
1078 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1079 | { | |
1080 | if (!policy_admin_capable(NULL)) | |
1081 | return -EPERM; | |
1082 | if (!apparmor_enabled) | |
1083 | return -EINVAL; | |
1084 | ||
1085 | return proc_dointvec(table, write, buffer, lenp, ppos); | |
1086 | } | |
1087 | ||
1088 | static struct ctl_path apparmor_sysctl_path[] = { | |
1089 | { .procname = "kernel", }, | |
1090 | { } | |
1091 | }; | |
1092 | ||
1093 | static struct ctl_table apparmor_sysctl_table[] = { | |
1094 | { | |
1095 | .procname = "unprivileged_userns_apparmor_policy", | |
1096 | .data = &unprivileged_userns_apparmor_policy, | |
1097 | .maxlen = sizeof(int), | |
1098 | .mode = 0600, | |
1099 | .proc_handler = apparmor_dointvec, | |
1100 | }, | |
1101 | { } | |
1102 | }; | |
1103 | ||
1104 | static int __init apparmor_init_sysctl(void) | |
1105 | { | |
1106 | return register_sysctl_paths(apparmor_sysctl_path, | |
1107 | apparmor_sysctl_table) ? 0 : -ENOMEM; | |
1108 | } | |
1109 | #else | |
1110 | static inline int apparmor_init_sysctl(void) | |
1111 | { | |
1112 | return 0; | |
1113 | } | |
1114 | #endif /* CONFIG_SYSCTL */ | |
1115 | ||
b5e95b48 JJ |
1116 | static int __init apparmor_init(void) |
1117 | { | |
1118 | int error; | |
1119 | ||
b1d9e6b0 | 1120 | if (!apparmor_enabled || !security_module_enable("apparmor")) { |
b5e95b48 | 1121 | aa_info_message("AppArmor disabled by boot time parameter"); |
954317fe | 1122 | apparmor_enabled = false; |
b5e95b48 JJ |
1123 | return 0; |
1124 | } | |
1125 | ||
11c236b8 JJ |
1126 | error = aa_setup_dfa_engine(); |
1127 | if (error) { | |
1128 | AA_ERROR("Unable to setup dfa engine\n"); | |
1129 | goto alloc_out; | |
1130 | } | |
1131 | ||
b5e95b48 JJ |
1132 | error = aa_alloc_root_ns(); |
1133 | if (error) { | |
1134 | AA_ERROR("Unable to allocate default profile namespace\n"); | |
1135 | goto alloc_out; | |
1136 | } | |
1137 | ||
e3ea1ca5 TH |
1138 | error = apparmor_init_sysctl(); |
1139 | if (error) { | |
1140 | AA_ERROR("Unable to register sysctls\n"); | |
1141 | goto alloc_out; | |
1142 | ||
1143 | } | |
1144 | ||
d4669f0b JJ |
1145 | error = alloc_buffers(); |
1146 | if (error) { | |
1147 | AA_ERROR("Unable to allocate work buffers\n"); | |
1148 | goto buffers_out; | |
1149 | } | |
1150 | ||
55a26ebf | 1151 | error = set_init_ctx(); |
b5e95b48 JJ |
1152 | if (error) { |
1153 | AA_ERROR("Failed to set context on init task\n"); | |
b1d9e6b0 | 1154 | aa_free_root_ns(); |
d4669f0b | 1155 | goto buffers_out; |
b5e95b48 | 1156 | } |
d69dece5 CS |
1157 | security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks), |
1158 | "apparmor"); | |
b5e95b48 JJ |
1159 | |
1160 | /* Report that AppArmor successfully initialized */ | |
1161 | apparmor_initialized = 1; | |
1162 | if (aa_g_profile_mode == APPARMOR_COMPLAIN) | |
1163 | aa_info_message("AppArmor initialized: complain mode enabled"); | |
1164 | else if (aa_g_profile_mode == APPARMOR_KILL) | |
1165 | aa_info_message("AppArmor initialized: kill mode enabled"); | |
1166 | else | |
1167 | aa_info_message("AppArmor initialized"); | |
1168 | ||
1169 | return error; | |
1170 | ||
d4669f0b JJ |
1171 | buffers_out: |
1172 | destroy_buffers(); | |
1173 | ||
b5e95b48 JJ |
1174 | alloc_out: |
1175 | aa_destroy_aafs(); | |
11c236b8 | 1176 | aa_teardown_dfa_engine(); |
b5e95b48 | 1177 | |
954317fe | 1178 | apparmor_enabled = false; |
b5e95b48 | 1179 | return error; |
b5e95b48 JJ |
1180 | } |
1181 | ||
1182 | security_initcall(apparmor_init); |