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> |
ab9f2115 MG |
26 | #include <linux/netfilter_ipv4.h> |
27 | #include <linux/netfilter_ipv6.h> | |
b5e95b48 | 28 | #include <net/sock.h> |
e262e32d | 29 | #include <uapi/linux/mount.h> |
b5e95b48 JJ |
30 | |
31 | #include "include/apparmor.h" | |
32 | #include "include/apparmorfs.h" | |
33 | #include "include/audit.h" | |
34 | #include "include/capability.h" | |
d8889d49 | 35 | #include "include/cred.h" |
b5e95b48 JJ |
36 | #include "include/file.h" |
37 | #include "include/ipc.h" | |
56974a6f | 38 | #include "include/net.h" |
b5e95b48 | 39 | #include "include/path.h" |
637f688d | 40 | #include "include/label.h" |
b5e95b48 | 41 | #include "include/policy.h" |
cff281f6 | 42 | #include "include/policy_ns.h" |
b5e95b48 | 43 | #include "include/procattr.h" |
2ea3ffb7 | 44 | #include "include/mount.h" |
c0929212 | 45 | #include "include/secid.h" |
b5e95b48 JJ |
46 | |
47 | /* Flag indicating whether initialization completed */ | |
545de8fe | 48 | int apparmor_initialized; |
b5e95b48 | 49 | |
d4669f0b JJ |
50 | DEFINE_PER_CPU(struct aa_buffers, aa_buffers); |
51 | ||
52 | ||
b5e95b48 JJ |
53 | /* |
54 | * LSM hook functions | |
55 | */ | |
56 | ||
57 | /* | |
d9087c49 | 58 | * put the associated labels |
b5e95b48 JJ |
59 | */ |
60 | static void apparmor_cred_free(struct cred *cred) | |
61 | { | |
d9087c49 | 62 | aa_put_label(cred_label(cred)); |
69b5a44a | 63 | set_cred_label(cred, NULL); |
b5e95b48 JJ |
64 | } |
65 | ||
66 | /* | |
67 | * allocate the apparmor part of blank credentials | |
68 | */ | |
69 | static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
70 | { | |
69b5a44a | 71 | set_cred_label(cred, NULL); |
b5e95b48 JJ |
72 | return 0; |
73 | } | |
74 | ||
75 | /* | |
d9087c49 | 76 | * prepare new cred label for modification by prepare_cred block |
b5e95b48 JJ |
77 | */ |
78 | static int apparmor_cred_prepare(struct cred *new, const struct cred *old, | |
79 | gfp_t gfp) | |
80 | { | |
69b5a44a | 81 | set_cred_label(new, aa_get_newest_label(cred_label(old))); |
b5e95b48 JJ |
82 | return 0; |
83 | } | |
84 | ||
85 | /* | |
86 | * transfer the apparmor data to a blank set of creds | |
87 | */ | |
88 | static void apparmor_cred_transfer(struct cred *new, const struct cred *old) | |
89 | { | |
69b5a44a | 90 | set_cred_label(new, aa_get_newest_label(cred_label(old))); |
b5e95b48 JJ |
91 | } |
92 | ||
3b529a76 JJ |
93 | static void apparmor_task_free(struct task_struct *task) |
94 | { | |
95 | ||
96 | aa_free_task_ctx(task_ctx(task)); | |
97 | task_ctx(task) = NULL; | |
98 | } | |
99 | ||
100 | static int apparmor_task_alloc(struct task_struct *task, | |
101 | unsigned long clone_flags) | |
102 | { | |
103 | struct aa_task_ctx *new = aa_alloc_task_ctx(GFP_KERNEL); | |
104 | ||
105 | if (!new) | |
106 | return -ENOMEM; | |
107 | ||
de62de59 | 108 | aa_dup_task_ctx(new, task_ctx(current)); |
3b529a76 | 109 | task_ctx(task) = new; |
b5e95b48 | 110 | |
3b529a76 | 111 | return 0; |
b5e95b48 JJ |
112 | } |
113 | ||
114 | static int apparmor_ptrace_access_check(struct task_struct *child, | |
115 | unsigned int mode) | |
116 | { | |
b2d09ae4 JJ |
117 | struct aa_label *tracer, *tracee; |
118 | int error; | |
119 | ||
1f8266ff | 120 | tracer = __begin_current_label_crit_section(); |
b2d09ae4 JJ |
121 | tracee = aa_get_task_label(child); |
122 | error = aa_may_ptrace(tracer, tracee, | |
338d0be4 JJ |
123 | (mode & PTRACE_MODE_READ) ? AA_PTRACE_READ |
124 | : AA_PTRACE_TRACE); | |
b2d09ae4 | 125 | aa_put_label(tracee); |
1f8266ff | 126 | __end_current_label_crit_section(tracer); |
b2d09ae4 JJ |
127 | |
128 | return error; | |
b5e95b48 JJ |
129 | } |
130 | ||
131 | static int apparmor_ptrace_traceme(struct task_struct *parent) | |
132 | { | |
b2d09ae4 JJ |
133 | struct aa_label *tracer, *tracee; |
134 | int error; | |
135 | ||
ca3fde52 | 136 | tracee = __begin_current_label_crit_section(); |
b2d09ae4 JJ |
137 | tracer = aa_get_task_label(parent); |
138 | error = aa_may_ptrace(tracer, tracee, AA_PTRACE_TRACE); | |
139 | aa_put_label(tracer); | |
ca3fde52 | 140 | __end_current_label_crit_section(tracee); |
b2d09ae4 JJ |
141 | |
142 | return error; | |
b5e95b48 JJ |
143 | } |
144 | ||
145 | /* Derived from security/commoncap.c:cap_capget */ | |
146 | static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective, | |
147 | kernel_cap_t *inheritable, kernel_cap_t *permitted) | |
148 | { | |
637f688d | 149 | struct aa_label *label; |
b5e95b48 JJ |
150 | const struct cred *cred; |
151 | ||
152 | rcu_read_lock(); | |
153 | cred = __task_cred(target); | |
637f688d | 154 | label = aa_get_newest_cred_label(cred); |
c70c86c4 | 155 | |
b1d9e6b0 CS |
156 | /* |
157 | * cap_capget is stacked ahead of this and will | |
158 | * initialize effective and permitted. | |
159 | */ | |
c70c86c4 JJ |
160 | if (!unconfined(label)) { |
161 | struct aa_profile *profile; | |
162 | struct label_it i; | |
163 | ||
164 | label_for_each_confined(i, label, profile) { | |
165 | if (COMPLAIN_MODE(profile)) | |
166 | continue; | |
167 | *effective = cap_intersect(*effective, | |
168 | profile->caps.allow); | |
169 | *permitted = cap_intersect(*permitted, | |
170 | profile->caps.allow); | |
171 | } | |
b5e95b48 JJ |
172 | } |
173 | rcu_read_unlock(); | |
637f688d | 174 | aa_put_label(label); |
b5e95b48 JJ |
175 | |
176 | return 0; | |
177 | } | |
178 | ||
6a9de491 EP |
179 | static int apparmor_capable(const struct cred *cred, struct user_namespace *ns, |
180 | int cap, int audit) | |
b5e95b48 | 181 | { |
637f688d | 182 | struct aa_label *label; |
b1d9e6b0 CS |
183 | int error = 0; |
184 | ||
637f688d JJ |
185 | label = aa_get_newest_cred_label(cred); |
186 | if (!unconfined(label)) | |
c70c86c4 | 187 | error = aa_capable(label, cap, audit); |
637f688d | 188 | aa_put_label(label); |
cf797c0e | 189 | |
b5e95b48 JJ |
190 | return error; |
191 | } | |
192 | ||
193 | /** | |
194 | * common_perm - basic common permission check wrapper fn for paths | |
195 | * @op: operation being checked | |
196 | * @path: path to check permission of (NOT NULL) | |
197 | * @mask: requested permissions mask | |
198 | * @cond: conditional info for the permission request (NOT NULL) | |
199 | * | |
200 | * Returns: %0 else error code if error or permission denied | |
201 | */ | |
47f6e5cc | 202 | static int common_perm(const char *op, const struct path *path, u32 mask, |
b5e95b48 JJ |
203 | struct path_cond *cond) |
204 | { | |
637f688d | 205 | struct aa_label *label; |
b5e95b48 JJ |
206 | int error = 0; |
207 | ||
637f688d JJ |
208 | label = __begin_current_label_crit_section(); |
209 | if (!unconfined(label)) | |
aebd873e | 210 | error = aa_path_perm(op, label, path, 0, mask, cond); |
637f688d | 211 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
212 | |
213 | return error; | |
214 | } | |
215 | ||
216 | /** | |
31f75bfe | 217 | * common_perm_cond - common permission wrapper around inode cond |
b5e95b48 | 218 | * @op: operation being checked |
31f75bfe | 219 | * @path: location to check (NOT NULL) |
b5e95b48 | 220 | * @mask: requested permissions mask |
b5e95b48 JJ |
221 | * |
222 | * Returns: %0 else error code if error or permission denied | |
223 | */ | |
31f75bfe | 224 | static int common_perm_cond(const char *op, const struct path *path, u32 mask) |
b5e95b48 | 225 | { |
31f75bfe JJ |
226 | struct path_cond cond = { d_backing_inode(path->dentry)->i_uid, |
227 | d_backing_inode(path->dentry)->i_mode | |
228 | }; | |
b5e95b48 | 229 | |
31f75bfe JJ |
230 | if (!path_mediated_fs(path->dentry)) |
231 | return 0; | |
232 | ||
233 | return common_perm(op, path, mask, &cond); | |
b5e95b48 JJ |
234 | } |
235 | ||
236 | /** | |
31f75bfe | 237 | * common_perm_dir_dentry - common permission wrapper when path is dir, dentry |
b5e95b48 | 238 | * @op: operation being checked |
31f75bfe JJ |
239 | * @dir: directory of the dentry (NOT NULL) |
240 | * @dentry: dentry to check (NOT NULL) | |
b5e95b48 | 241 | * @mask: requested permissions mask |
31f75bfe | 242 | * @cond: conditional info for the permission request (NOT NULL) |
b5e95b48 JJ |
243 | * |
244 | * Returns: %0 else error code if error or permission denied | |
245 | */ | |
31f75bfe JJ |
246 | static int common_perm_dir_dentry(const char *op, const struct path *dir, |
247 | struct dentry *dentry, u32 mask, | |
248 | struct path_cond *cond) | |
b5e95b48 | 249 | { |
31f75bfe | 250 | struct path path = { .mnt = dir->mnt, .dentry = dentry }; |
b5e95b48 | 251 | |
31f75bfe | 252 | return common_perm(op, &path, mask, cond); |
b5e95b48 JJ |
253 | } |
254 | ||
255 | /** | |
256 | * common_perm_rm - common permission wrapper for operations doing rm | |
257 | * @op: operation being checked | |
258 | * @dir: directory that the dentry is in (NOT NULL) | |
259 | * @dentry: dentry being rm'd (NOT NULL) | |
260 | * @mask: requested permission mask | |
261 | * | |
262 | * Returns: %0 else error code if error or permission denied | |
263 | */ | |
47f6e5cc | 264 | static int common_perm_rm(const char *op, const struct path *dir, |
b5e95b48 JJ |
265 | struct dentry *dentry, u32 mask) |
266 | { | |
c6f493d6 | 267 | struct inode *inode = d_backing_inode(dentry); |
b5e95b48 JJ |
268 | struct path_cond cond = { }; |
269 | ||
efeee83a | 270 | if (!inode || !path_mediated_fs(dentry)) |
b5e95b48 JJ |
271 | return 0; |
272 | ||
273 | cond.uid = inode->i_uid; | |
274 | cond.mode = inode->i_mode; | |
275 | ||
276 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
277 | } | |
278 | ||
279 | /** | |
280 | * common_perm_create - common permission wrapper for operations doing create | |
281 | * @op: operation being checked | |
282 | * @dir: directory that dentry will be created in (NOT NULL) | |
283 | * @dentry: dentry to create (NOT NULL) | |
284 | * @mask: request permission mask | |
285 | * @mode: created file mode | |
286 | * | |
287 | * Returns: %0 else error code if error or permission denied | |
288 | */ | |
47f6e5cc | 289 | static int common_perm_create(const char *op, const struct path *dir, |
d6b49f7a | 290 | struct dentry *dentry, u32 mask, umode_t mode) |
b5e95b48 JJ |
291 | { |
292 | struct path_cond cond = { current_fsuid(), mode }; | |
293 | ||
efeee83a | 294 | if (!path_mediated_fs(dir->dentry)) |
b5e95b48 JJ |
295 | return 0; |
296 | ||
297 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
298 | } | |
299 | ||
989f74e0 | 300 | static int apparmor_path_unlink(const struct path *dir, struct dentry *dentry) |
b5e95b48 JJ |
301 | { |
302 | return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE); | |
303 | } | |
304 | ||
d3607752 | 305 | static int apparmor_path_mkdir(const struct path *dir, struct dentry *dentry, |
4572befe | 306 | umode_t mode) |
b5e95b48 JJ |
307 | { |
308 | return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE, | |
309 | S_IFDIR); | |
310 | } | |
311 | ||
989f74e0 | 312 | static int apparmor_path_rmdir(const struct path *dir, struct dentry *dentry) |
b5e95b48 JJ |
313 | { |
314 | return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE); | |
315 | } | |
316 | ||
d3607752 | 317 | static int apparmor_path_mknod(const struct path *dir, struct dentry *dentry, |
04fc66e7 | 318 | umode_t mode, unsigned int dev) |
b5e95b48 JJ |
319 | { |
320 | return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode); | |
321 | } | |
322 | ||
81f4c506 | 323 | static int apparmor_path_truncate(const struct path *path) |
b5e95b48 | 324 | { |
e53cfe6c | 325 | return common_perm_cond(OP_TRUNC, path, MAY_WRITE | AA_MAY_SETATTR); |
b5e95b48 JJ |
326 | } |
327 | ||
d3607752 | 328 | static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry, |
b5e95b48 JJ |
329 | const char *old_name) |
330 | { | |
331 | return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE, | |
332 | S_IFLNK); | |
333 | } | |
334 | ||
3ccee46a | 335 | static int apparmor_path_link(struct dentry *old_dentry, const struct path *new_dir, |
b5e95b48 JJ |
336 | struct dentry *new_dentry) |
337 | { | |
637f688d | 338 | struct aa_label *label; |
b5e95b48 JJ |
339 | int error = 0; |
340 | ||
efeee83a | 341 | if (!path_mediated_fs(old_dentry)) |
b5e95b48 JJ |
342 | return 0; |
343 | ||
637f688d JJ |
344 | label = begin_current_label_crit_section(); |
345 | if (!unconfined(label)) | |
8014370f | 346 | error = aa_path_link(label, old_dentry, new_dir, new_dentry); |
637f688d | 347 | end_current_label_crit_section(label); |
cf797c0e | 348 | |
b5e95b48 JJ |
349 | return error; |
350 | } | |
351 | ||
3ccee46a AV |
352 | static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry, |
353 | const struct path *new_dir, struct dentry *new_dentry) | |
b5e95b48 | 354 | { |
637f688d | 355 | struct aa_label *label; |
b5e95b48 JJ |
356 | int error = 0; |
357 | ||
efeee83a | 358 | if (!path_mediated_fs(old_dentry)) |
b5e95b48 JJ |
359 | return 0; |
360 | ||
637f688d JJ |
361 | label = begin_current_label_crit_section(); |
362 | if (!unconfined(label)) { | |
8486adf0 KC |
363 | struct path old_path = { .mnt = old_dir->mnt, |
364 | .dentry = old_dentry }; | |
365 | struct path new_path = { .mnt = new_dir->mnt, | |
366 | .dentry = new_dentry }; | |
c6f493d6 DH |
367 | struct path_cond cond = { d_backing_inode(old_dentry)->i_uid, |
368 | d_backing_inode(old_dentry)->i_mode | |
b5e95b48 JJ |
369 | }; |
370 | ||
aebd873e | 371 | error = aa_path_perm(OP_RENAME_SRC, label, &old_path, 0, |
e53cfe6c JJ |
372 | MAY_READ | AA_MAY_GETATTR | MAY_WRITE | |
373 | AA_MAY_SETATTR | AA_MAY_DELETE, | |
b5e95b48 JJ |
374 | &cond); |
375 | if (!error) | |
aebd873e | 376 | error = aa_path_perm(OP_RENAME_DEST, label, &new_path, |
e53cfe6c | 377 | 0, MAY_WRITE | AA_MAY_SETATTR | |
b5e95b48 JJ |
378 | AA_MAY_CREATE, &cond); |
379 | ||
380 | } | |
637f688d | 381 | end_current_label_crit_section(label); |
cf797c0e | 382 | |
b5e95b48 JJ |
383 | return error; |
384 | } | |
385 | ||
be01f9f2 | 386 | static int apparmor_path_chmod(const struct path *path, umode_t mode) |
b5e95b48 | 387 | { |
31f75bfe | 388 | return common_perm_cond(OP_CHMOD, path, AA_MAY_CHMOD); |
b5e95b48 JJ |
389 | } |
390 | ||
7fd25dac | 391 | static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid) |
b5e95b48 | 392 | { |
31f75bfe | 393 | return common_perm_cond(OP_CHOWN, path, AA_MAY_CHOWN); |
b5e95b48 JJ |
394 | } |
395 | ||
3f7036a0 | 396 | static int apparmor_inode_getattr(const struct path *path) |
b5e95b48 | 397 | { |
e53cfe6c | 398 | return common_perm_cond(OP_GETATTR, path, AA_MAY_GETATTR); |
b5e95b48 JJ |
399 | } |
400 | ||
94817692 | 401 | static int apparmor_file_open(struct file *file) |
b5e95b48 | 402 | { |
637f688d JJ |
403 | struct aa_file_ctx *fctx = file_ctx(file); |
404 | struct aa_label *label; | |
b5e95b48 JJ |
405 | int error = 0; |
406 | ||
efeee83a | 407 | if (!path_mediated_fs(file->f_path.dentry)) |
b5e95b48 JJ |
408 | return 0; |
409 | ||
410 | /* If in exec, permission is handled by bprm hooks. | |
411 | * Cache permissions granted by the previous exec check, with | |
412 | * implicit read and executable mmap which are required to | |
413 | * actually execute the image. | |
414 | */ | |
415 | if (current->in_execve) { | |
55a26ebf | 416 | fctx->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP; |
b5e95b48 JJ |
417 | return 0; |
418 | } | |
419 | ||
94817692 | 420 | label = aa_get_newest_cred_label(file->f_cred); |
637f688d | 421 | if (!unconfined(label)) { |
496ad9aa | 422 | struct inode *inode = file_inode(file); |
b5e95b48 JJ |
423 | struct path_cond cond = { inode->i_uid, inode->i_mode }; |
424 | ||
aebd873e | 425 | error = aa_path_perm(OP_OPEN, label, &file->f_path, 0, |
b5e95b48 JJ |
426 | aa_map_file_to_perms(file), &cond); |
427 | /* todo cache full allowed permissions set and state */ | |
55a26ebf | 428 | fctx->allow = aa_map_file_to_perms(file); |
b5e95b48 | 429 | } |
637f688d | 430 | aa_put_label(label); |
b5e95b48 JJ |
431 | |
432 | return error; | |
433 | } | |
434 | ||
435 | static int apparmor_file_alloc_security(struct file *file) | |
436 | { | |
cf797c0e JJ |
437 | int error = 0; |
438 | ||
b5e95b48 | 439 | /* freed by apparmor_file_free_security */ |
637f688d | 440 | struct aa_label *label = begin_current_label_crit_section(); |
190a9518 | 441 | file->f_security = aa_alloc_file_ctx(label, GFP_KERNEL); |
2835a13b JJ |
442 | if (!file_ctx(file)) |
443 | error = -ENOMEM; | |
637f688d | 444 | end_current_label_crit_section(label); |
b5e95b48 | 445 | |
cf797c0e | 446 | return error; |
b5e95b48 JJ |
447 | } |
448 | ||
449 | static void apparmor_file_free_security(struct file *file) | |
450 | { | |
2835a13b | 451 | aa_free_file_ctx(file_ctx(file)); |
b5e95b48 JJ |
452 | } |
453 | ||
47f6e5cc | 454 | static int common_file_perm(const char *op, struct file *file, u32 mask) |
b5e95b48 | 455 | { |
190a9518 | 456 | struct aa_label *label; |
b5e95b48 JJ |
457 | int error = 0; |
458 | ||
192ca6b5 JJ |
459 | /* don't reaudit files closed during inheritance */ |
460 | if (file->f_path.dentry == aa_null.dentry) | |
461 | return -EACCES; | |
462 | ||
637f688d | 463 | label = __begin_current_label_crit_section(); |
190a9518 | 464 | error = aa_file_perm(op, label, file, mask); |
637f688d | 465 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
466 | |
467 | return error; | |
468 | } | |
469 | ||
064dc947 JJ |
470 | static int apparmor_file_receive(struct file *file) |
471 | { | |
472 | return common_file_perm(OP_FRECEIVE, file, aa_map_file_to_perms(file)); | |
473 | } | |
474 | ||
b5e95b48 JJ |
475 | static int apparmor_file_permission(struct file *file, int mask) |
476 | { | |
477 | return common_file_perm(OP_FPERM, file, mask); | |
478 | } | |
479 | ||
480 | static int apparmor_file_lock(struct file *file, unsigned int cmd) | |
481 | { | |
482 | u32 mask = AA_MAY_LOCK; | |
483 | ||
484 | if (cmd == F_WRLCK) | |
485 | mask |= MAY_WRITE; | |
486 | ||
487 | return common_file_perm(OP_FLOCK, file, mask); | |
488 | } | |
489 | ||
47f6e5cc | 490 | static int common_mmap(const char *op, struct file *file, unsigned long prot, |
b5e95b48 JJ |
491 | unsigned long flags) |
492 | { | |
b5e95b48 JJ |
493 | int mask = 0; |
494 | ||
637f688d | 495 | if (!file || !file_ctx(file)) |
b5e95b48 JJ |
496 | return 0; |
497 | ||
498 | if (prot & PROT_READ) | |
499 | mask |= MAY_READ; | |
500 | /* | |
501 | * Private mappings don't require write perms since they don't | |
502 | * write back to the files | |
503 | */ | |
504 | if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE)) | |
505 | mask |= MAY_WRITE; | |
506 | if (prot & PROT_EXEC) | |
507 | mask |= AA_EXEC_MMAP; | |
508 | ||
b5e95b48 JJ |
509 | return common_file_perm(op, file, mask); |
510 | } | |
511 | ||
e5467859 AV |
512 | static int apparmor_mmap_file(struct file *file, unsigned long reqprot, |
513 | unsigned long prot, unsigned long flags) | |
b5e95b48 | 514 | { |
b5e95b48 JJ |
515 | return common_mmap(OP_FMMAP, file, prot, flags); |
516 | } | |
517 | ||
518 | static int apparmor_file_mprotect(struct vm_area_struct *vma, | |
519 | unsigned long reqprot, unsigned long prot) | |
520 | { | |
521 | return common_mmap(OP_FMPROT, vma->vm_file, prot, | |
522 | !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0); | |
523 | } | |
524 | ||
2ea3ffb7 JJ |
525 | static int apparmor_sb_mount(const char *dev_name, const struct path *path, |
526 | const char *type, unsigned long flags, void *data) | |
527 | { | |
528 | struct aa_label *label; | |
529 | int error = 0; | |
530 | ||
531 | /* Discard magic */ | |
532 | if ((flags & MS_MGC_MSK) == MS_MGC_VAL) | |
533 | flags &= ~MS_MGC_MSK; | |
534 | ||
535 | flags &= ~AA_MS_IGNORE_MASK; | |
536 | ||
537 | label = __begin_current_label_crit_section(); | |
538 | if (!unconfined(label)) { | |
539 | if (flags & MS_REMOUNT) | |
540 | error = aa_remount(label, path, flags, data); | |
541 | else if (flags & MS_BIND) | |
542 | error = aa_bind_mount(label, path, dev_name, flags); | |
543 | else if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE | | |
544 | MS_UNBINDABLE)) | |
545 | error = aa_mount_change_type(label, path, flags); | |
546 | else if (flags & MS_MOVE) | |
547 | error = aa_move_mount(label, path, dev_name); | |
548 | else | |
549 | error = aa_new_mount(label, dev_name, path, type, | |
550 | flags, data); | |
551 | } | |
552 | __end_current_label_crit_section(label); | |
553 | ||
554 | return error; | |
555 | } | |
556 | ||
557 | static int apparmor_sb_umount(struct vfsmount *mnt, int flags) | |
558 | { | |
559 | struct aa_label *label; | |
560 | int error = 0; | |
561 | ||
562 | label = __begin_current_label_crit_section(); | |
563 | if (!unconfined(label)) | |
564 | error = aa_umount(label, mnt, flags); | |
565 | __end_current_label_crit_section(label); | |
566 | ||
567 | return error; | |
568 | } | |
569 | ||
570 | static int apparmor_sb_pivotroot(const struct path *old_path, | |
571 | const struct path *new_path) | |
572 | { | |
573 | struct aa_label *label; | |
574 | int error = 0; | |
575 | ||
576 | label = aa_get_current_label(); | |
577 | if (!unconfined(label)) | |
578 | error = aa_pivotroot(label, old_path, new_path); | |
579 | aa_put_label(label); | |
580 | ||
581 | return error; | |
582 | } | |
583 | ||
b5e95b48 JJ |
584 | static int apparmor_getprocattr(struct task_struct *task, char *name, |
585 | char **value) | |
586 | { | |
587 | int error = -ENOENT; | |
b5e95b48 JJ |
588 | /* released below */ |
589 | const struct cred *cred = get_task_cred(task); | |
de62de59 | 590 | struct aa_task_ctx *ctx = task_ctx(current); |
637f688d | 591 | struct aa_label *label = NULL; |
b5e95b48 JJ |
592 | |
593 | if (strcmp(name, "current") == 0) | |
d9087c49 | 594 | label = aa_get_newest_label(cred_label(cred)); |
55a26ebf | 595 | else if (strcmp(name, "prev") == 0 && ctx->previous) |
637f688d | 596 | label = aa_get_newest_label(ctx->previous); |
55a26ebf | 597 | else if (strcmp(name, "exec") == 0 && ctx->onexec) |
637f688d | 598 | label = aa_get_newest_label(ctx->onexec); |
b5e95b48 JJ |
599 | else |
600 | error = -EINVAL; | |
601 | ||
637f688d | 602 | if (label) |
76a1d263 | 603 | error = aa_getprocattr(label, value); |
77b071b3 | 604 | |
637f688d | 605 | aa_put_label(label); |
b5e95b48 JJ |
606 | put_cred(cred); |
607 | ||
608 | return error; | |
609 | } | |
610 | ||
b21507e2 SS |
611 | static int apparmor_setprocattr(const char *name, void *value, |
612 | size_t size) | |
b5e95b48 | 613 | { |
e89b8081 | 614 | char *command, *largs = NULL, *args = value; |
b5e95b48 JJ |
615 | size_t arg_size; |
616 | int error; | |
ef88a7ac | 617 | DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SETPROCATTR); |
b5e95b48 JJ |
618 | |
619 | if (size == 0) | |
620 | return -EINVAL; | |
b5e95b48 | 621 | |
e89b8081 VN |
622 | /* AppArmor requires that the buffer must be null terminated atm */ |
623 | if (args[size - 1] != '\0') { | |
624 | /* null terminate */ | |
625 | largs = args = kmalloc(size + 1, GFP_KERNEL); | |
626 | if (!args) | |
627 | return -ENOMEM; | |
628 | memcpy(args, value, size); | |
629 | args[size] = '\0'; | |
630 | } | |
631 | ||
632 | error = -EINVAL; | |
b5e95b48 JJ |
633 | args = strim(args); |
634 | command = strsep(&args, " "); | |
635 | if (!args) | |
e89b8081 | 636 | goto out; |
b5e95b48 JJ |
637 | args = skip_spaces(args); |
638 | if (!*args) | |
e89b8081 | 639 | goto out; |
b5e95b48 | 640 | |
d4d03f74 | 641 | arg_size = size - (args - (largs ? largs : (char *) value)); |
b5e95b48 JJ |
642 | if (strcmp(name, "current") == 0) { |
643 | if (strcmp(command, "changehat") == 0) { | |
644 | error = aa_setprocattr_changehat(args, arg_size, | |
df8073c6 | 645 | AA_CHANGE_NOFLAGS); |
b5e95b48 JJ |
646 | } else if (strcmp(command, "permhat") == 0) { |
647 | error = aa_setprocattr_changehat(args, arg_size, | |
df8073c6 | 648 | AA_CHANGE_TEST); |
b5e95b48 | 649 | } else if (strcmp(command, "changeprofile") == 0) { |
df8073c6 | 650 | error = aa_change_profile(args, AA_CHANGE_NOFLAGS); |
b5e95b48 | 651 | } else if (strcmp(command, "permprofile") == 0) { |
df8073c6 | 652 | error = aa_change_profile(args, AA_CHANGE_TEST); |
6c5fc8f1 JJ |
653 | } else if (strcmp(command, "stack") == 0) { |
654 | error = aa_change_profile(args, AA_CHANGE_STACK); | |
3eea57c2 JJ |
655 | } else |
656 | goto fail; | |
b5e95b48 | 657 | } else if (strcmp(name, "exec") == 0) { |
3eea57c2 | 658 | if (strcmp(command, "exec") == 0) |
df8073c6 | 659 | error = aa_change_profile(args, AA_CHANGE_ONEXEC); |
6c5fc8f1 JJ |
660 | else if (strcmp(command, "stack") == 0) |
661 | error = aa_change_profile(args, (AA_CHANGE_ONEXEC | | |
662 | AA_CHANGE_STACK)); | |
3eea57c2 JJ |
663 | else |
664 | goto fail; | |
665 | } else | |
b5e95b48 | 666 | /* only support the "current" and "exec" process attributes */ |
e89b8081 | 667 | goto fail; |
3eea57c2 | 668 | |
b5e95b48 JJ |
669 | if (!error) |
670 | error = size; | |
e89b8081 VN |
671 | out: |
672 | kfree(largs); | |
b5e95b48 | 673 | return error; |
3eea57c2 JJ |
674 | |
675 | fail: | |
637f688d | 676 | aad(&sa)->label = begin_current_label_crit_section(); |
ef88a7ac JJ |
677 | aad(&sa)->info = name; |
678 | aad(&sa)->error = error = -EINVAL; | |
3eea57c2 | 679 | aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL); |
637f688d | 680 | end_current_label_crit_section(aad(&sa)->label); |
e89b8081 | 681 | goto out; |
b5e95b48 JJ |
682 | } |
683 | ||
fe864821 JJ |
684 | /** |
685 | * apparmor_bprm_committing_creds - do task cleanup on committing new creds | |
686 | * @bprm: binprm for the exec (NOT NULL) | |
687 | */ | |
688 | static void apparmor_bprm_committing_creds(struct linux_binprm *bprm) | |
689 | { | |
637f688d | 690 | struct aa_label *label = aa_current_raw_label(); |
d9087c49 | 691 | struct aa_label *new_label = cred_label(bprm->cred); |
fe864821 JJ |
692 | |
693 | /* bail out if unconfined or not changing profile */ | |
d9087c49 JJ |
694 | if ((new_label->proxy == label->proxy) || |
695 | (unconfined(new_label))) | |
fe864821 JJ |
696 | return; |
697 | ||
192ca6b5 JJ |
698 | aa_inherit_files(bprm->cred, current->files); |
699 | ||
fe864821 JJ |
700 | current->pdeath_signal = 0; |
701 | ||
637f688d | 702 | /* reset soft limits and set hard limits for the new label */ |
d9087c49 | 703 | __aa_transition_rlimits(label, new_label); |
fe864821 JJ |
704 | } |
705 | ||
706 | /** | |
707 | * apparmor_bprm_committed_cred - do cleanup after new creds committed | |
708 | * @bprm: binprm for the exec (NOT NULL) | |
709 | */ | |
710 | static void apparmor_bprm_committed_creds(struct linux_binprm *bprm) | |
711 | { | |
3b529a76 | 712 | /* clear out temporary/transitional state from the context */ |
de62de59 | 713 | aa_clear_task_ctx_trans(task_ctx(current)); |
3b529a76 | 714 | |
fe864821 JJ |
715 | return; |
716 | } | |
717 | ||
a7ae3645 JJ |
718 | static void apparmor_task_getsecid(struct task_struct *p, u32 *secid) |
719 | { | |
720 | struct aa_label *label = aa_get_task_label(p); | |
721 | *secid = label->secid; | |
722 | aa_put_label(label); | |
723 | } | |
724 | ||
7cb4dc9f JS |
725 | static int apparmor_task_setrlimit(struct task_struct *task, |
726 | unsigned int resource, struct rlimit *new_rlim) | |
b5e95b48 | 727 | { |
637f688d | 728 | struct aa_label *label = __begin_current_label_crit_section(); |
b5e95b48 JJ |
729 | int error = 0; |
730 | ||
637f688d | 731 | if (!unconfined(label)) |
86b92cb7 | 732 | error = aa_task_setrlimit(label, task, resource, new_rlim); |
637f688d | 733 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
734 | |
735 | return error; | |
736 | } | |
737 | ||
ae7795bc | 738 | static int apparmor_task_kill(struct task_struct *target, struct kernel_siginfo *info, |
6b4f3d01 | 739 | int sig, const struct cred *cred) |
cd1dbf76 JJ |
740 | { |
741 | struct aa_label *cl, *tl; | |
742 | int error; | |
743 | ||
6b4f3d01 SS |
744 | if (cred) { |
745 | /* | |
746 | * Dealing with USB IO specific behavior | |
cd1dbf76 | 747 | */ |
6b4f3d01 SS |
748 | cl = aa_get_newest_cred_label(cred); |
749 | tl = aa_get_task_label(target); | |
750 | error = aa_may_signal(cl, tl, sig); | |
751 | aa_put_label(cl); | |
752 | aa_put_label(tl); | |
753 | return error; | |
754 | } | |
755 | ||
cd1dbf76 JJ |
756 | cl = __begin_current_label_crit_section(); |
757 | tl = aa_get_task_label(target); | |
758 | error = aa_may_signal(cl, tl, sig); | |
759 | aa_put_label(tl); | |
760 | __end_current_label_crit_section(cl); | |
761 | ||
762 | return error; | |
763 | } | |
764 | ||
56974a6f JJ |
765 | /** |
766 | * apparmor_sk_alloc_security - allocate and attach the sk_security field | |
767 | */ | |
768 | static int apparmor_sk_alloc_security(struct sock *sk, int family, gfp_t flags) | |
769 | { | |
770 | struct aa_sk_ctx *ctx; | |
771 | ||
772 | ctx = kzalloc(sizeof(*ctx), flags); | |
773 | if (!ctx) | |
774 | return -ENOMEM; | |
775 | ||
776 | SK_CTX(sk) = ctx; | |
777 | ||
778 | return 0; | |
779 | } | |
780 | ||
781 | /** | |
782 | * apparmor_sk_free_security - free the sk_security field | |
783 | */ | |
784 | static void apparmor_sk_free_security(struct sock *sk) | |
785 | { | |
786 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
787 | ||
788 | SK_CTX(sk) = NULL; | |
789 | aa_put_label(ctx->label); | |
790 | aa_put_label(ctx->peer); | |
791 | kfree(ctx); | |
792 | } | |
793 | ||
794 | /** | |
795 | * apparmor_clone_security - clone the sk_security field | |
796 | */ | |
797 | static void apparmor_sk_clone_security(const struct sock *sk, | |
798 | struct sock *newsk) | |
799 | { | |
800 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
801 | struct aa_sk_ctx *new = SK_CTX(newsk); | |
802 | ||
803 | new->label = aa_get_label(ctx->label); | |
804 | new->peer = aa_get_label(ctx->peer); | |
805 | } | |
806 | ||
807 | /** | |
808 | * apparmor_socket_create - check perms before creating a new socket | |
809 | */ | |
810 | static int apparmor_socket_create(int family, int type, int protocol, int kern) | |
811 | { | |
812 | struct aa_label *label; | |
813 | int error = 0; | |
814 | ||
815 | AA_BUG(in_interrupt()); | |
816 | ||
817 | label = begin_current_label_crit_section(); | |
818 | if (!(kern || unconfined(label))) | |
819 | error = af_select(family, | |
820 | create_perm(label, family, type, protocol), | |
821 | aa_af_perm(label, OP_CREATE, AA_MAY_CREATE, | |
822 | family, type, protocol)); | |
823 | end_current_label_crit_section(label); | |
824 | ||
825 | return error; | |
826 | } | |
827 | ||
828 | /** | |
829 | * apparmor_socket_post_create - setup the per-socket security struct | |
830 | * | |
831 | * Note: | |
832 | * - kernel sockets currently labeled unconfined but we may want to | |
833 | * move to a special kernel label | |
834 | * - socket may not have sk here if created with sock_create_lite or | |
835 | * sock_alloc. These should be accept cases which will be handled in | |
836 | * sock_graft. | |
837 | */ | |
838 | static int apparmor_socket_post_create(struct socket *sock, int family, | |
839 | int type, int protocol, int kern) | |
840 | { | |
841 | struct aa_label *label; | |
842 | ||
843 | if (kern) { | |
844 | struct aa_ns *ns = aa_get_current_ns(); | |
845 | ||
846 | label = aa_get_label(ns_unconfined(ns)); | |
847 | aa_put_ns(ns); | |
848 | } else | |
849 | label = aa_get_current_label(); | |
850 | ||
851 | if (sock->sk) { | |
852 | struct aa_sk_ctx *ctx = SK_CTX(sock->sk); | |
853 | ||
854 | aa_put_label(ctx->label); | |
855 | ctx->label = aa_get_label(label); | |
856 | } | |
857 | aa_put_label(label); | |
858 | ||
859 | return 0; | |
860 | } | |
861 | ||
862 | /** | |
863 | * apparmor_socket_bind - check perms before bind addr to socket | |
864 | */ | |
865 | static int apparmor_socket_bind(struct socket *sock, | |
866 | struct sockaddr *address, int addrlen) | |
867 | { | |
868 | AA_BUG(!sock); | |
869 | AA_BUG(!sock->sk); | |
870 | AA_BUG(!address); | |
871 | AA_BUG(in_interrupt()); | |
872 | ||
873 | return af_select(sock->sk->sk_family, | |
874 | bind_perm(sock, address, addrlen), | |
875 | aa_sk_perm(OP_BIND, AA_MAY_BIND, sock->sk)); | |
876 | } | |
877 | ||
878 | /** | |
879 | * apparmor_socket_connect - check perms before connecting @sock to @address | |
880 | */ | |
881 | static int apparmor_socket_connect(struct socket *sock, | |
882 | struct sockaddr *address, int addrlen) | |
883 | { | |
884 | AA_BUG(!sock); | |
885 | AA_BUG(!sock->sk); | |
886 | AA_BUG(!address); | |
887 | AA_BUG(in_interrupt()); | |
888 | ||
889 | return af_select(sock->sk->sk_family, | |
890 | connect_perm(sock, address, addrlen), | |
891 | aa_sk_perm(OP_CONNECT, AA_MAY_CONNECT, sock->sk)); | |
892 | } | |
893 | ||
894 | /** | |
895 | * apparmor_socket_list - check perms before allowing listen | |
896 | */ | |
897 | static int apparmor_socket_listen(struct socket *sock, int backlog) | |
898 | { | |
899 | AA_BUG(!sock); | |
900 | AA_BUG(!sock->sk); | |
901 | AA_BUG(in_interrupt()); | |
902 | ||
903 | return af_select(sock->sk->sk_family, | |
904 | listen_perm(sock, backlog), | |
905 | aa_sk_perm(OP_LISTEN, AA_MAY_LISTEN, sock->sk)); | |
906 | } | |
907 | ||
908 | /** | |
909 | * apparmor_socket_accept - check perms before accepting a new connection. | |
910 | * | |
911 | * Note: while @newsock is created and has some information, the accept | |
912 | * has not been done. | |
913 | */ | |
914 | static int apparmor_socket_accept(struct socket *sock, struct socket *newsock) | |
915 | { | |
916 | AA_BUG(!sock); | |
917 | AA_BUG(!sock->sk); | |
918 | AA_BUG(!newsock); | |
919 | AA_BUG(in_interrupt()); | |
920 | ||
921 | return af_select(sock->sk->sk_family, | |
922 | accept_perm(sock, newsock), | |
923 | aa_sk_perm(OP_ACCEPT, AA_MAY_ACCEPT, sock->sk)); | |
924 | } | |
925 | ||
926 | static int aa_sock_msg_perm(const char *op, u32 request, struct socket *sock, | |
927 | struct msghdr *msg, int size) | |
928 | { | |
929 | AA_BUG(!sock); | |
930 | AA_BUG(!sock->sk); | |
931 | AA_BUG(!msg); | |
932 | AA_BUG(in_interrupt()); | |
933 | ||
934 | return af_select(sock->sk->sk_family, | |
935 | msg_perm(op, request, sock, msg, size), | |
936 | aa_sk_perm(op, request, sock->sk)); | |
937 | } | |
938 | ||
939 | /** | |
940 | * apparmor_socket_sendmsg - check perms before sending msg to another socket | |
941 | */ | |
942 | static int apparmor_socket_sendmsg(struct socket *sock, | |
943 | struct msghdr *msg, int size) | |
944 | { | |
945 | return aa_sock_msg_perm(OP_SENDMSG, AA_MAY_SEND, sock, msg, size); | |
946 | } | |
947 | ||
948 | /** | |
949 | * apparmor_socket_recvmsg - check perms before receiving a message | |
950 | */ | |
951 | static int apparmor_socket_recvmsg(struct socket *sock, | |
952 | struct msghdr *msg, int size, int flags) | |
953 | { | |
954 | return aa_sock_msg_perm(OP_RECVMSG, AA_MAY_RECEIVE, sock, msg, size); | |
955 | } | |
956 | ||
957 | /* revaliation, get/set attr, shutdown */ | |
958 | static int aa_sock_perm(const char *op, u32 request, struct socket *sock) | |
959 | { | |
960 | AA_BUG(!sock); | |
961 | AA_BUG(!sock->sk); | |
962 | AA_BUG(in_interrupt()); | |
963 | ||
964 | return af_select(sock->sk->sk_family, | |
965 | sock_perm(op, request, sock), | |
966 | aa_sk_perm(op, request, sock->sk)); | |
967 | } | |
968 | ||
969 | /** | |
970 | * apparmor_socket_getsockname - check perms before getting the local address | |
971 | */ | |
972 | static int apparmor_socket_getsockname(struct socket *sock) | |
973 | { | |
974 | return aa_sock_perm(OP_GETSOCKNAME, AA_MAY_GETATTR, sock); | |
975 | } | |
976 | ||
977 | /** | |
978 | * apparmor_socket_getpeername - check perms before getting remote address | |
979 | */ | |
980 | static int apparmor_socket_getpeername(struct socket *sock) | |
981 | { | |
982 | return aa_sock_perm(OP_GETPEERNAME, AA_MAY_GETATTR, sock); | |
983 | } | |
984 | ||
985 | /* revaliation, get/set attr, opt */ | |
986 | static int aa_sock_opt_perm(const char *op, u32 request, struct socket *sock, | |
987 | int level, int optname) | |
988 | { | |
989 | AA_BUG(!sock); | |
990 | AA_BUG(!sock->sk); | |
991 | AA_BUG(in_interrupt()); | |
992 | ||
993 | return af_select(sock->sk->sk_family, | |
994 | opt_perm(op, request, sock, level, optname), | |
995 | aa_sk_perm(op, request, sock->sk)); | |
996 | } | |
997 | ||
998 | /** | |
999 | * apparmor_getsockopt - check perms before getting socket options | |
1000 | */ | |
1001 | static int apparmor_socket_getsockopt(struct socket *sock, int level, | |
1002 | int optname) | |
1003 | { | |
1004 | return aa_sock_opt_perm(OP_GETSOCKOPT, AA_MAY_GETOPT, sock, | |
1005 | level, optname); | |
1006 | } | |
1007 | ||
1008 | /** | |
1009 | * apparmor_setsockopt - check perms before setting socket options | |
1010 | */ | |
1011 | static int apparmor_socket_setsockopt(struct socket *sock, int level, | |
1012 | int optname) | |
1013 | { | |
1014 | return aa_sock_opt_perm(OP_SETSOCKOPT, AA_MAY_SETOPT, sock, | |
1015 | level, optname); | |
1016 | } | |
1017 | ||
1018 | /** | |
1019 | * apparmor_socket_shutdown - check perms before shutting down @sock conn | |
1020 | */ | |
1021 | static int apparmor_socket_shutdown(struct socket *sock, int how) | |
1022 | { | |
1023 | return aa_sock_perm(OP_SHUTDOWN, AA_MAY_SHUTDOWN, sock); | |
1024 | } | |
1025 | ||
e1af4779 | 1026 | #ifdef CONFIG_NETWORK_SECMARK |
56974a6f JJ |
1027 | /** |
1028 | * apparmor_socket_sock_recv_skb - check perms before associating skb to sk | |
1029 | * | |
1030 | * Note: can not sleep may be called with locks held | |
1031 | * | |
1032 | * dont want protocol specific in __skb_recv_datagram() | |
1033 | * to deny an incoming connection socket_sock_rcv_skb() | |
1034 | */ | |
1035 | static int apparmor_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
1036 | { | |
ab9f2115 MG |
1037 | struct aa_sk_ctx *ctx = SK_CTX(sk); |
1038 | ||
1039 | if (!skb->secmark) | |
1040 | return 0; | |
1041 | ||
1042 | return apparmor_secmark_check(ctx->label, OP_RECVMSG, AA_MAY_RECEIVE, | |
1043 | skb->secmark, sk); | |
56974a6f | 1044 | } |
e1af4779 | 1045 | #endif |
56974a6f JJ |
1046 | |
1047 | ||
1048 | static struct aa_label *sk_peer_label(struct sock *sk) | |
1049 | { | |
1050 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
1051 | ||
1052 | if (ctx->peer) | |
1053 | return ctx->peer; | |
1054 | ||
1055 | return ERR_PTR(-ENOPROTOOPT); | |
1056 | } | |
1057 | ||
1058 | /** | |
1059 | * apparmor_socket_getpeersec_stream - get security context of peer | |
1060 | * | |
1061 | * Note: for tcp only valid if using ipsec or cipso on lan | |
1062 | */ | |
1063 | static int apparmor_socket_getpeersec_stream(struct socket *sock, | |
1064 | char __user *optval, | |
1065 | int __user *optlen, | |
1066 | unsigned int len) | |
1067 | { | |
1068 | char *name; | |
1069 | int slen, error = 0; | |
1070 | struct aa_label *label; | |
1071 | struct aa_label *peer; | |
1072 | ||
1073 | label = begin_current_label_crit_section(); | |
1074 | peer = sk_peer_label(sock->sk); | |
1075 | if (IS_ERR(peer)) { | |
1076 | error = PTR_ERR(peer); | |
1077 | goto done; | |
1078 | } | |
1079 | slen = aa_label_asxprint(&name, labels_ns(label), peer, | |
1080 | FLAG_SHOW_MODE | FLAG_VIEW_SUBNS | | |
1081 | FLAG_HIDDEN_UNCONFINED, GFP_KERNEL); | |
1082 | /* don't include terminating \0 in slen, it breaks some apps */ | |
1083 | if (slen < 0) { | |
1084 | error = -ENOMEM; | |
1085 | } else { | |
1086 | if (slen > len) { | |
1087 | error = -ERANGE; | |
1088 | } else if (copy_to_user(optval, name, slen)) { | |
1089 | error = -EFAULT; | |
1090 | goto out; | |
1091 | } | |
1092 | if (put_user(slen, optlen)) | |
1093 | error = -EFAULT; | |
1094 | out: | |
1095 | kfree(name); | |
1096 | ||
1097 | } | |
1098 | ||
1099 | done: | |
1100 | end_current_label_crit_section(label); | |
1101 | ||
1102 | return error; | |
1103 | } | |
1104 | ||
1105 | /** | |
1106 | * apparmor_socket_getpeersec_dgram - get security label of packet | |
1107 | * @sock: the peer socket | |
1108 | * @skb: packet data | |
1109 | * @secid: pointer to where to put the secid of the packet | |
1110 | * | |
1111 | * Sets the netlabel socket state on sk from parent | |
1112 | */ | |
1113 | static int apparmor_socket_getpeersec_dgram(struct socket *sock, | |
1114 | struct sk_buff *skb, u32 *secid) | |
1115 | ||
1116 | { | |
1117 | /* TODO: requires secid support */ | |
1118 | return -ENOPROTOOPT; | |
1119 | } | |
1120 | ||
1121 | /** | |
1122 | * apparmor_sock_graft - Initialize newly created socket | |
1123 | * @sk: child sock | |
1124 | * @parent: parent socket | |
1125 | * | |
1126 | * Note: could set off of SOCK_CTX(parent) but need to track inode and we can | |
1127 | * just set sk security information off of current creating process label | |
1128 | * Labeling of sk for accept case - probably should be sock based | |
1129 | * instead of task, because of the case where an implicitly labeled | |
1130 | * socket is shared by different tasks. | |
1131 | */ | |
1132 | static void apparmor_sock_graft(struct sock *sk, struct socket *parent) | |
1133 | { | |
1134 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
1135 | ||
1136 | if (!ctx->label) | |
1137 | ctx->label = aa_get_current_label(); | |
1138 | } | |
1139 | ||
e1af4779 | 1140 | #ifdef CONFIG_NETWORK_SECMARK |
ab9f2115 MG |
1141 | static int apparmor_inet_conn_request(struct sock *sk, struct sk_buff *skb, |
1142 | struct request_sock *req) | |
1143 | { | |
1144 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
1145 | ||
1146 | if (!skb->secmark) | |
1147 | return 0; | |
1148 | ||
1149 | return apparmor_secmark_check(ctx->label, OP_CONNECT, AA_MAY_CONNECT, | |
1150 | skb->secmark, sk); | |
1151 | } | |
e1af4779 | 1152 | #endif |
ab9f2115 | 1153 | |
ca97d939 | 1154 | static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = { |
e20b043a CS |
1155 | LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check), |
1156 | LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme), | |
1157 | LSM_HOOK_INIT(capget, apparmor_capget), | |
1158 | LSM_HOOK_INIT(capable, apparmor_capable), | |
1159 | ||
2ea3ffb7 JJ |
1160 | LSM_HOOK_INIT(sb_mount, apparmor_sb_mount), |
1161 | LSM_HOOK_INIT(sb_umount, apparmor_sb_umount), | |
1162 | LSM_HOOK_INIT(sb_pivotroot, apparmor_sb_pivotroot), | |
1163 | ||
e20b043a CS |
1164 | LSM_HOOK_INIT(path_link, apparmor_path_link), |
1165 | LSM_HOOK_INIT(path_unlink, apparmor_path_unlink), | |
1166 | LSM_HOOK_INIT(path_symlink, apparmor_path_symlink), | |
1167 | LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir), | |
1168 | LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir), | |
1169 | LSM_HOOK_INIT(path_mknod, apparmor_path_mknod), | |
1170 | LSM_HOOK_INIT(path_rename, apparmor_path_rename), | |
1171 | LSM_HOOK_INIT(path_chmod, apparmor_path_chmod), | |
1172 | LSM_HOOK_INIT(path_chown, apparmor_path_chown), | |
1173 | LSM_HOOK_INIT(path_truncate, apparmor_path_truncate), | |
1174 | LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr), | |
1175 | ||
1176 | LSM_HOOK_INIT(file_open, apparmor_file_open), | |
064dc947 | 1177 | LSM_HOOK_INIT(file_receive, apparmor_file_receive), |
e20b043a CS |
1178 | LSM_HOOK_INIT(file_permission, apparmor_file_permission), |
1179 | LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security), | |
1180 | LSM_HOOK_INIT(file_free_security, apparmor_file_free_security), | |
1181 | LSM_HOOK_INIT(mmap_file, apparmor_mmap_file), | |
e20b043a CS |
1182 | LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect), |
1183 | LSM_HOOK_INIT(file_lock, apparmor_file_lock), | |
1184 | ||
1185 | LSM_HOOK_INIT(getprocattr, apparmor_getprocattr), | |
1186 | LSM_HOOK_INIT(setprocattr, apparmor_setprocattr), | |
1187 | ||
56974a6f JJ |
1188 | LSM_HOOK_INIT(sk_alloc_security, apparmor_sk_alloc_security), |
1189 | LSM_HOOK_INIT(sk_free_security, apparmor_sk_free_security), | |
1190 | LSM_HOOK_INIT(sk_clone_security, apparmor_sk_clone_security), | |
1191 | ||
1192 | LSM_HOOK_INIT(socket_create, apparmor_socket_create), | |
1193 | LSM_HOOK_INIT(socket_post_create, apparmor_socket_post_create), | |
1194 | LSM_HOOK_INIT(socket_bind, apparmor_socket_bind), | |
1195 | LSM_HOOK_INIT(socket_connect, apparmor_socket_connect), | |
1196 | LSM_HOOK_INIT(socket_listen, apparmor_socket_listen), | |
1197 | LSM_HOOK_INIT(socket_accept, apparmor_socket_accept), | |
1198 | LSM_HOOK_INIT(socket_sendmsg, apparmor_socket_sendmsg), | |
1199 | LSM_HOOK_INIT(socket_recvmsg, apparmor_socket_recvmsg), | |
1200 | LSM_HOOK_INIT(socket_getsockname, apparmor_socket_getsockname), | |
1201 | LSM_HOOK_INIT(socket_getpeername, apparmor_socket_getpeername), | |
1202 | LSM_HOOK_INIT(socket_getsockopt, apparmor_socket_getsockopt), | |
1203 | LSM_HOOK_INIT(socket_setsockopt, apparmor_socket_setsockopt), | |
1204 | LSM_HOOK_INIT(socket_shutdown, apparmor_socket_shutdown), | |
e1af4779 | 1205 | #ifdef CONFIG_NETWORK_SECMARK |
56974a6f | 1206 | LSM_HOOK_INIT(socket_sock_rcv_skb, apparmor_socket_sock_rcv_skb), |
e1af4779 | 1207 | #endif |
56974a6f JJ |
1208 | LSM_HOOK_INIT(socket_getpeersec_stream, |
1209 | apparmor_socket_getpeersec_stream), | |
1210 | LSM_HOOK_INIT(socket_getpeersec_dgram, | |
1211 | apparmor_socket_getpeersec_dgram), | |
1212 | LSM_HOOK_INIT(sock_graft, apparmor_sock_graft), | |
e1af4779 | 1213 | #ifdef CONFIG_NETWORK_SECMARK |
ab9f2115 | 1214 | LSM_HOOK_INIT(inet_conn_request, apparmor_inet_conn_request), |
e1af4779 | 1215 | #endif |
56974a6f | 1216 | |
e20b043a CS |
1217 | LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank), |
1218 | LSM_HOOK_INIT(cred_free, apparmor_cred_free), | |
1219 | LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare), | |
1220 | LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer), | |
1221 | ||
1222 | LSM_HOOK_INIT(bprm_set_creds, apparmor_bprm_set_creds), | |
1223 | LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds), | |
1224 | LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds), | |
e20b043a | 1225 | |
3b529a76 JJ |
1226 | LSM_HOOK_INIT(task_free, apparmor_task_free), |
1227 | LSM_HOOK_INIT(task_alloc, apparmor_task_alloc), | |
a7ae3645 | 1228 | LSM_HOOK_INIT(task_getsecid, apparmor_task_getsecid), |
e20b043a | 1229 | LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit), |
cd1dbf76 | 1230 | LSM_HOOK_INIT(task_kill, apparmor_task_kill), |
c0929212 | 1231 | |
e79c26d0 MG |
1232 | #ifdef CONFIG_AUDIT |
1233 | LSM_HOOK_INIT(audit_rule_init, aa_audit_rule_init), | |
1234 | LSM_HOOK_INIT(audit_rule_known, aa_audit_rule_known), | |
1235 | LSM_HOOK_INIT(audit_rule_match, aa_audit_rule_match), | |
1236 | LSM_HOOK_INIT(audit_rule_free, aa_audit_rule_free), | |
1237 | #endif | |
1238 | ||
c0929212 JJ |
1239 | LSM_HOOK_INIT(secid_to_secctx, apparmor_secid_to_secctx), |
1240 | LSM_HOOK_INIT(secctx_to_secid, apparmor_secctx_to_secid), | |
1241 | LSM_HOOK_INIT(release_secctx, apparmor_release_secctx), | |
b5e95b48 JJ |
1242 | }; |
1243 | ||
1244 | /* | |
1245 | * AppArmor sysfs module parameters | |
1246 | */ | |
1247 | ||
101d6c82 SR |
1248 | static int param_set_aabool(const char *val, const struct kernel_param *kp); |
1249 | static int param_get_aabool(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 1250 | #define param_check_aabool param_check_bool |
9c27847d | 1251 | static const struct kernel_param_ops param_ops_aabool = { |
6a4c2643 | 1252 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
1253 | .set = param_set_aabool, |
1254 | .get = param_get_aabool | |
1255 | }; | |
b5e95b48 | 1256 | |
101d6c82 SR |
1257 | static int param_set_aauint(const char *val, const struct kernel_param *kp); |
1258 | static int param_get_aauint(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 1259 | #define param_check_aauint param_check_uint |
9c27847d | 1260 | static const struct kernel_param_ops param_ops_aauint = { |
101d6c82 SR |
1261 | .set = param_set_aauint, |
1262 | .get = param_get_aauint | |
1263 | }; | |
b5e95b48 | 1264 | |
101d6c82 SR |
1265 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp); |
1266 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 1267 | #define param_check_aalockpolicy param_check_bool |
9c27847d | 1268 | static const struct kernel_param_ops param_ops_aalockpolicy = { |
6a4c2643 | 1269 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
1270 | .set = param_set_aalockpolicy, |
1271 | .get = param_get_aalockpolicy | |
1272 | }; | |
b5e95b48 | 1273 | |
e4dca7b7 KC |
1274 | static int param_set_audit(const char *val, const struct kernel_param *kp); |
1275 | static int param_get_audit(char *buffer, const struct kernel_param *kp); | |
b5e95b48 | 1276 | |
e4dca7b7 KC |
1277 | static int param_set_mode(const char *val, const struct kernel_param *kp); |
1278 | static int param_get_mode(char *buffer, const struct kernel_param *kp); | |
b5e95b48 JJ |
1279 | |
1280 | /* Flag values, also controllable via /sys/module/apparmor/parameters | |
1281 | * We define special types as we want to do additional mediation. | |
1282 | */ | |
1283 | ||
1284 | /* AppArmor global enforcement switch - complain, enforce, kill */ | |
1285 | enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE; | |
1286 | module_param_call(mode, param_set_mode, param_get_mode, | |
1287 | &aa_g_profile_mode, S_IRUSR | S_IWUSR); | |
1288 | ||
6059f71f | 1289 | /* whether policy verification hashing is enabled */ |
7616ac70 | 1290 | bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT); |
3ccb76c5 | 1291 | #ifdef CONFIG_SECURITY_APPARMOR_HASH |
6059f71f | 1292 | module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR); |
7616ac70 | 1293 | #endif |
6059f71f | 1294 | |
b5e95b48 | 1295 | /* Debug mode */ |
eea7a05f | 1296 | bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_APPARMOR_DEBUG_MESSAGES); |
b5e95b48 JJ |
1297 | module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR); |
1298 | ||
1299 | /* Audit mode */ | |
1300 | enum audit_mode aa_g_audit; | |
1301 | module_param_call(audit, param_set_audit, param_get_audit, | |
1302 | &aa_g_audit, S_IRUSR | S_IWUSR); | |
1303 | ||
1304 | /* Determines if audit header is included in audited messages. This | |
1305 | * provides more context if the audit daemon is not running | |
1306 | */ | |
954317fe | 1307 | bool aa_g_audit_header = true; |
b5e95b48 JJ |
1308 | module_param_named(audit_header, aa_g_audit_header, aabool, |
1309 | S_IRUSR | S_IWUSR); | |
1310 | ||
1311 | /* lock out loading/removal of policy | |
1312 | * TODO: add in at boot loading of policy, which is the only way to | |
1313 | * load policy, if lock_policy is set | |
1314 | */ | |
90ab5ee9 | 1315 | bool aa_g_lock_policy; |
b5e95b48 JJ |
1316 | module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy, |
1317 | S_IRUSR | S_IWUSR); | |
1318 | ||
1319 | /* Syscall logging mode */ | |
90ab5ee9 | 1320 | bool aa_g_logsyscall; |
b5e95b48 JJ |
1321 | module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR); |
1322 | ||
1323 | /* Maximum pathname length before accesses will start getting rejected */ | |
1324 | unsigned int aa_g_path_max = 2 * PATH_MAX; | |
622f6e32 | 1325 | module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR); |
b5e95b48 JJ |
1326 | |
1327 | /* Determines how paranoid loading of policy is and how much verification | |
1328 | * on the loaded policy is done. | |
abbf8734 JJ |
1329 | * DEPRECATED: read only as strict checking of load is always done now |
1330 | * that none root users (user namespaces) can load policy. | |
b5e95b48 | 1331 | */ |
954317fe | 1332 | bool aa_g_paranoid_load = true; |
abbf8734 | 1333 | module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO); |
b5e95b48 JJ |
1334 | |
1335 | /* Boot time disable flag */ | |
0102fb83 | 1336 | static int apparmor_enabled __lsm_ro_after_init = 1; |
c5459b82 | 1337 | module_param_named(enabled, apparmor_enabled, int, 0444); |
b5e95b48 JJ |
1338 | |
1339 | static int __init apparmor_enabled_setup(char *str) | |
1340 | { | |
1341 | unsigned long enabled; | |
29707b20 | 1342 | int error = kstrtoul(str, 0, &enabled); |
b5e95b48 JJ |
1343 | if (!error) |
1344 | apparmor_enabled = enabled ? 1 : 0; | |
1345 | return 1; | |
1346 | } | |
1347 | ||
1348 | __setup("apparmor=", apparmor_enabled_setup); | |
1349 | ||
1350 | /* set global flag turning off the ability to load policy */ | |
101d6c82 | 1351 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp) |
b5e95b48 | 1352 | { |
545de8fe JJ |
1353 | if (!apparmor_enabled) |
1354 | return -EINVAL; | |
1355 | if (apparmor_initialized && !policy_admin_capable(NULL)) | |
b5e95b48 | 1356 | return -EPERM; |
b5e95b48 JJ |
1357 | return param_set_bool(val, kp); |
1358 | } | |
1359 | ||
101d6c82 | 1360 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1361 | { |
ca4bd5ae JJ |
1362 | if (!apparmor_enabled) |
1363 | return -EINVAL; | |
545de8fe JJ |
1364 | if (apparmor_initialized && !policy_view_capable(NULL)) |
1365 | return -EPERM; | |
b5e95b48 JJ |
1366 | return param_get_bool(buffer, kp); |
1367 | } | |
1368 | ||
101d6c82 | 1369 | static int param_set_aabool(const char *val, const struct kernel_param *kp) |
b5e95b48 | 1370 | { |
ca4bd5ae JJ |
1371 | if (!apparmor_enabled) |
1372 | return -EINVAL; | |
545de8fe JJ |
1373 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
1374 | return -EPERM; | |
b5e95b48 JJ |
1375 | return param_set_bool(val, kp); |
1376 | } | |
1377 | ||
101d6c82 | 1378 | static int param_get_aabool(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1379 | { |
ca4bd5ae JJ |
1380 | if (!apparmor_enabled) |
1381 | return -EINVAL; | |
545de8fe JJ |
1382 | if (apparmor_initialized && !policy_view_capable(NULL)) |
1383 | return -EPERM; | |
b5e95b48 JJ |
1384 | return param_get_bool(buffer, kp); |
1385 | } | |
1386 | ||
101d6c82 | 1387 | static int param_set_aauint(const char *val, const struct kernel_param *kp) |
b5e95b48 | 1388 | { |
39d84824 JJ |
1389 | int error; |
1390 | ||
ca4bd5ae JJ |
1391 | if (!apparmor_enabled) |
1392 | return -EINVAL; | |
39d84824 JJ |
1393 | /* file is ro but enforce 2nd line check */ |
1394 | if (apparmor_initialized) | |
545de8fe | 1395 | return -EPERM; |
39d84824 JJ |
1396 | |
1397 | error = param_set_uint(val, kp); | |
1398 | pr_info("AppArmor: buffer size set to %d bytes\n", aa_g_path_max); | |
1399 | ||
1400 | return error; | |
b5e95b48 JJ |
1401 | } |
1402 | ||
101d6c82 | 1403 | static int param_get_aauint(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1404 | { |
ca4bd5ae JJ |
1405 | if (!apparmor_enabled) |
1406 | return -EINVAL; | |
545de8fe JJ |
1407 | if (apparmor_initialized && !policy_view_capable(NULL)) |
1408 | return -EPERM; | |
b5e95b48 JJ |
1409 | return param_get_uint(buffer, kp); |
1410 | } | |
1411 | ||
e4dca7b7 | 1412 | static int param_get_audit(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1413 | { |
b5e95b48 JJ |
1414 | if (!apparmor_enabled) |
1415 | return -EINVAL; | |
545de8fe JJ |
1416 | if (apparmor_initialized && !policy_view_capable(NULL)) |
1417 | return -EPERM; | |
b5e95b48 JJ |
1418 | return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]); |
1419 | } | |
1420 | ||
e4dca7b7 | 1421 | static int param_set_audit(const char *val, const struct kernel_param *kp) |
b5e95b48 JJ |
1422 | { |
1423 | int i; | |
b5e95b48 JJ |
1424 | |
1425 | if (!apparmor_enabled) | |
1426 | return -EINVAL; | |
b5e95b48 JJ |
1427 | if (!val) |
1428 | return -EINVAL; | |
545de8fe JJ |
1429 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
1430 | return -EPERM; | |
b5e95b48 | 1431 | |
5d8779a5 AS |
1432 | i = match_string(audit_mode_names, AUDIT_MAX_INDEX, val); |
1433 | if (i < 0) | |
1434 | return -EINVAL; | |
b5e95b48 | 1435 | |
5d8779a5 AS |
1436 | aa_g_audit = i; |
1437 | return 0; | |
b5e95b48 JJ |
1438 | } |
1439 | ||
e4dca7b7 | 1440 | static int param_get_mode(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1441 | { |
b5e95b48 JJ |
1442 | if (!apparmor_enabled) |
1443 | return -EINVAL; | |
545de8fe JJ |
1444 | if (apparmor_initialized && !policy_view_capable(NULL)) |
1445 | return -EPERM; | |
b5e95b48 | 1446 | |
0d259f04 | 1447 | return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]); |
b5e95b48 JJ |
1448 | } |
1449 | ||
e4dca7b7 | 1450 | static int param_set_mode(const char *val, const struct kernel_param *kp) |
b5e95b48 JJ |
1451 | { |
1452 | int i; | |
b5e95b48 JJ |
1453 | |
1454 | if (!apparmor_enabled) | |
1455 | return -EINVAL; | |
b5e95b48 JJ |
1456 | if (!val) |
1457 | return -EINVAL; | |
545de8fe JJ |
1458 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
1459 | return -EPERM; | |
b5e95b48 | 1460 | |
5d8779a5 AS |
1461 | i = match_string(aa_profile_mode_names, APPARMOR_MODE_NAMES_MAX_INDEX, |
1462 | val); | |
1463 | if (i < 0) | |
1464 | return -EINVAL; | |
b5e95b48 | 1465 | |
5d8779a5 AS |
1466 | aa_g_profile_mode = i; |
1467 | return 0; | |
b5e95b48 JJ |
1468 | } |
1469 | ||
1470 | /* | |
1471 | * AppArmor init functions | |
1472 | */ | |
1473 | ||
1474 | /** | |
55a26ebf | 1475 | * set_init_ctx - set a task context and profile on the first task. |
b5e95b48 JJ |
1476 | * |
1477 | * TODO: allow setting an alternate profile than unconfined | |
1478 | */ | |
55a26ebf | 1479 | static int __init set_init_ctx(void) |
b5e95b48 JJ |
1480 | { |
1481 | struct cred *cred = (struct cred *)current->real_cred; | |
55a26ebf | 1482 | struct aa_task_ctx *ctx; |
b5e95b48 | 1483 | |
f175221a | 1484 | ctx = aa_alloc_task_ctx(GFP_KERNEL); |
55a26ebf | 1485 | if (!ctx) |
b5e95b48 JJ |
1486 | return -ENOMEM; |
1487 | ||
69b5a44a | 1488 | set_cred_label(cred, aa_get_label(ns_unconfined(root_ns))); |
f175221a | 1489 | task_ctx(current) = ctx; |
b5e95b48 JJ |
1490 | |
1491 | return 0; | |
1492 | } | |
1493 | ||
d4669f0b JJ |
1494 | static void destroy_buffers(void) |
1495 | { | |
1496 | u32 i, j; | |
1497 | ||
1498 | for_each_possible_cpu(i) { | |
1499 | for_each_cpu_buffer(j) { | |
1500 | kfree(per_cpu(aa_buffers, i).buf[j]); | |
1501 | per_cpu(aa_buffers, i).buf[j] = NULL; | |
1502 | } | |
1503 | } | |
1504 | } | |
1505 | ||
1506 | static int __init alloc_buffers(void) | |
1507 | { | |
1508 | u32 i, j; | |
1509 | ||
1510 | for_each_possible_cpu(i) { | |
1511 | for_each_cpu_buffer(j) { | |
1512 | char *buffer; | |
1513 | ||
1514 | if (cpu_to_node(i) > num_online_nodes()) | |
1515 | /* fallback to kmalloc for offline nodes */ | |
1516 | buffer = kmalloc(aa_g_path_max, GFP_KERNEL); | |
1517 | else | |
1518 | buffer = kmalloc_node(aa_g_path_max, GFP_KERNEL, | |
1519 | cpu_to_node(i)); | |
1520 | if (!buffer) { | |
1521 | destroy_buffers(); | |
1522 | return -ENOMEM; | |
1523 | } | |
1524 | per_cpu(aa_buffers, i).buf[j] = buffer; | |
1525 | } | |
1526 | } | |
1527 | ||
1528 | return 0; | |
1529 | } | |
1530 | ||
e3ea1ca5 TH |
1531 | #ifdef CONFIG_SYSCTL |
1532 | static int apparmor_dointvec(struct ctl_table *table, int write, | |
1533 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1534 | { | |
1535 | if (!policy_admin_capable(NULL)) | |
1536 | return -EPERM; | |
1537 | if (!apparmor_enabled) | |
1538 | return -EINVAL; | |
1539 | ||
1540 | return proc_dointvec(table, write, buffer, lenp, ppos); | |
1541 | } | |
1542 | ||
1543 | static struct ctl_path apparmor_sysctl_path[] = { | |
1544 | { .procname = "kernel", }, | |
1545 | { } | |
1546 | }; | |
1547 | ||
1548 | static struct ctl_table apparmor_sysctl_table[] = { | |
1549 | { | |
1550 | .procname = "unprivileged_userns_apparmor_policy", | |
1551 | .data = &unprivileged_userns_apparmor_policy, | |
1552 | .maxlen = sizeof(int), | |
1553 | .mode = 0600, | |
1554 | .proc_handler = apparmor_dointvec, | |
1555 | }, | |
1556 | { } | |
1557 | }; | |
1558 | ||
1559 | static int __init apparmor_init_sysctl(void) | |
1560 | { | |
1561 | return register_sysctl_paths(apparmor_sysctl_path, | |
1562 | apparmor_sysctl_table) ? 0 : -ENOMEM; | |
1563 | } | |
1564 | #else | |
1565 | static inline int apparmor_init_sysctl(void) | |
1566 | { | |
1567 | return 0; | |
1568 | } | |
1569 | #endif /* CONFIG_SYSCTL */ | |
1570 | ||
e1af4779 | 1571 | #if defined(CONFIG_NETFILTER) && defined(CONFIG_NETWORK_SECMARK) |
ab9f2115 MG |
1572 | static unsigned int apparmor_ip_postroute(void *priv, |
1573 | struct sk_buff *skb, | |
1574 | const struct nf_hook_state *state) | |
1575 | { | |
1576 | struct aa_sk_ctx *ctx; | |
1577 | struct sock *sk; | |
1578 | ||
1579 | if (!skb->secmark) | |
1580 | return NF_ACCEPT; | |
1581 | ||
1582 | sk = skb_to_full_sk(skb); | |
1583 | if (sk == NULL) | |
1584 | return NF_ACCEPT; | |
1585 | ||
1586 | ctx = SK_CTX(sk); | |
1587 | if (!apparmor_secmark_check(ctx->label, OP_SENDMSG, AA_MAY_SEND, | |
1588 | skb->secmark, sk)) | |
1589 | return NF_ACCEPT; | |
1590 | ||
1591 | return NF_DROP_ERR(-ECONNREFUSED); | |
1592 | ||
1593 | } | |
1594 | ||
1595 | static unsigned int apparmor_ipv4_postroute(void *priv, | |
1596 | struct sk_buff *skb, | |
1597 | const struct nf_hook_state *state) | |
1598 | { | |
1599 | return apparmor_ip_postroute(priv, skb, state); | |
1600 | } | |
1601 | ||
1602 | static unsigned int apparmor_ipv6_postroute(void *priv, | |
1603 | struct sk_buff *skb, | |
1604 | const struct nf_hook_state *state) | |
1605 | { | |
1606 | return apparmor_ip_postroute(priv, skb, state); | |
1607 | } | |
1608 | ||
1609 | static const struct nf_hook_ops apparmor_nf_ops[] = { | |
1610 | { | |
1611 | .hook = apparmor_ipv4_postroute, | |
1612 | .pf = NFPROTO_IPV4, | |
1613 | .hooknum = NF_INET_POST_ROUTING, | |
1614 | .priority = NF_IP_PRI_SELINUX_FIRST, | |
1615 | }, | |
1616 | #if IS_ENABLED(CONFIG_IPV6) | |
1617 | { | |
1618 | .hook = apparmor_ipv6_postroute, | |
1619 | .pf = NFPROTO_IPV6, | |
1620 | .hooknum = NF_INET_POST_ROUTING, | |
1621 | .priority = NF_IP6_PRI_SELINUX_FIRST, | |
1622 | }, | |
1623 | #endif | |
1624 | }; | |
1625 | ||
1626 | static int __net_init apparmor_nf_register(struct net *net) | |
1627 | { | |
1628 | int ret; | |
1629 | ||
1630 | ret = nf_register_net_hooks(net, apparmor_nf_ops, | |
1631 | ARRAY_SIZE(apparmor_nf_ops)); | |
1632 | return ret; | |
1633 | } | |
1634 | ||
1635 | static void __net_exit apparmor_nf_unregister(struct net *net) | |
1636 | { | |
1637 | nf_unregister_net_hooks(net, apparmor_nf_ops, | |
1638 | ARRAY_SIZE(apparmor_nf_ops)); | |
1639 | } | |
1640 | ||
1641 | static struct pernet_operations apparmor_net_ops = { | |
1642 | .init = apparmor_nf_register, | |
1643 | .exit = apparmor_nf_unregister, | |
1644 | }; | |
1645 | ||
1646 | static int __init apparmor_nf_ip_init(void) | |
1647 | { | |
1648 | int err; | |
1649 | ||
1650 | if (!apparmor_enabled) | |
1651 | return 0; | |
1652 | ||
1653 | err = register_pernet_subsys(&apparmor_net_ops); | |
1654 | if (err) | |
1655 | panic("Apparmor: register_pernet_subsys: error %d\n", err); | |
1656 | ||
1657 | return 0; | |
1658 | } | |
1659 | __initcall(apparmor_nf_ip_init); | |
e1af4779 | 1660 | #endif |
ab9f2115 | 1661 | |
b5e95b48 JJ |
1662 | static int __init apparmor_init(void) |
1663 | { | |
1664 | int error; | |
1665 | ||
a4c3f89c JJ |
1666 | aa_secids_init(); |
1667 | ||
11c236b8 JJ |
1668 | error = aa_setup_dfa_engine(); |
1669 | if (error) { | |
1670 | AA_ERROR("Unable to setup dfa engine\n"); | |
1671 | goto alloc_out; | |
1672 | } | |
1673 | ||
b5e95b48 JJ |
1674 | error = aa_alloc_root_ns(); |
1675 | if (error) { | |
1676 | AA_ERROR("Unable to allocate default profile namespace\n"); | |
1677 | goto alloc_out; | |
1678 | } | |
1679 | ||
e3ea1ca5 TH |
1680 | error = apparmor_init_sysctl(); |
1681 | if (error) { | |
1682 | AA_ERROR("Unable to register sysctls\n"); | |
1683 | goto alloc_out; | |
1684 | ||
1685 | } | |
1686 | ||
d4669f0b JJ |
1687 | error = alloc_buffers(); |
1688 | if (error) { | |
1689 | AA_ERROR("Unable to allocate work buffers\n"); | |
1690 | goto buffers_out; | |
1691 | } | |
1692 | ||
55a26ebf | 1693 | error = set_init_ctx(); |
b5e95b48 JJ |
1694 | if (error) { |
1695 | AA_ERROR("Failed to set context on init task\n"); | |
b1d9e6b0 | 1696 | aa_free_root_ns(); |
d4669f0b | 1697 | goto buffers_out; |
b5e95b48 | 1698 | } |
d69dece5 CS |
1699 | security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks), |
1700 | "apparmor"); | |
b5e95b48 JJ |
1701 | |
1702 | /* Report that AppArmor successfully initialized */ | |
1703 | apparmor_initialized = 1; | |
1704 | if (aa_g_profile_mode == APPARMOR_COMPLAIN) | |
1705 | aa_info_message("AppArmor initialized: complain mode enabled"); | |
1706 | else if (aa_g_profile_mode == APPARMOR_KILL) | |
1707 | aa_info_message("AppArmor initialized: kill mode enabled"); | |
1708 | else | |
1709 | aa_info_message("AppArmor initialized"); | |
1710 | ||
1711 | return error; | |
1712 | ||
d4669f0b JJ |
1713 | buffers_out: |
1714 | destroy_buffers(); | |
1715 | ||
b5e95b48 JJ |
1716 | alloc_out: |
1717 | aa_destroy_aafs(); | |
11c236b8 | 1718 | aa_teardown_dfa_engine(); |
b5e95b48 | 1719 | |
954317fe | 1720 | apparmor_enabled = false; |
b5e95b48 | 1721 | return error; |
b5e95b48 JJ |
1722 | } |
1723 | ||
3d6e5f6d | 1724 | DEFINE_LSM(apparmor) = { |
07aed2f2 | 1725 | .name = "apparmor", |
14bd99c8 | 1726 | .flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE, |
c5459b82 | 1727 | .enabled = &apparmor_enabled, |
3d6e5f6d KC |
1728 | .init = apparmor_init, |
1729 | }; |