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b886d83c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
b5e95b48 JJ |
2 | /* |
3 | * AppArmor security module | |
4 | * | |
5 | * This file contains AppArmor LSM hooks. | |
6 | * | |
7 | * Copyright (C) 1998-2008 Novell/SUSE | |
8 | * Copyright 2009-2010 Canonical Ltd. | |
b5e95b48 JJ |
9 | */ |
10 | ||
3c4ed7bd | 11 | #include <linux/lsm_hooks.h> |
b5e95b48 JJ |
12 | #include <linux/moduleparam.h> |
13 | #include <linux/mm.h> | |
14 | #include <linux/mman.h> | |
15 | #include <linux/mount.h> | |
16 | #include <linux/namei.h> | |
17 | #include <linux/ptrace.h> | |
18 | #include <linux/ctype.h> | |
19 | #include <linux/sysctl.h> | |
20 | #include <linux/audit.h> | |
3486740a | 21 | #include <linux/user_namespace.h> |
ab9f2115 MG |
22 | #include <linux/netfilter_ipv4.h> |
23 | #include <linux/netfilter_ipv6.h> | |
f4d6b94b | 24 | #include <linux/zstd.h> |
b5e95b48 | 25 | #include <net/sock.h> |
e262e32d | 26 | #include <uapi/linux/mount.h> |
f3b8788c | 27 | #include <uapi/linux/lsm.h> |
b5e95b48 JJ |
28 | |
29 | #include "include/apparmor.h" | |
30 | #include "include/apparmorfs.h" | |
31 | #include "include/audit.h" | |
32 | #include "include/capability.h" | |
d8889d49 | 33 | #include "include/cred.h" |
b5e95b48 JJ |
34 | #include "include/file.h" |
35 | #include "include/ipc.h" | |
56974a6f | 36 | #include "include/net.h" |
b5e95b48 | 37 | #include "include/path.h" |
637f688d | 38 | #include "include/label.h" |
b5e95b48 | 39 | #include "include/policy.h" |
cff281f6 | 40 | #include "include/policy_ns.h" |
b5e95b48 | 41 | #include "include/procattr.h" |
2ea3ffb7 | 42 | #include "include/mount.h" |
c0929212 | 43 | #include "include/secid.h" |
b5e95b48 JJ |
44 | |
45 | /* Flag indicating whether initialization completed */ | |
545de8fe | 46 | int apparmor_initialized; |
b5e95b48 | 47 | |
df323337 SAS |
48 | union aa_buffer { |
49 | struct list_head list; | |
ba808cb5 | 50 | DECLARE_FLEX_ARRAY(char, buffer); |
df323337 | 51 | }; |
d4669f0b | 52 | |
ea9bae12 JJ |
53 | struct aa_local_cache { |
54 | unsigned int hold; | |
55 | unsigned int count; | |
56 | struct list_head head; | |
57 | }; | |
58 | ||
341c1fda JJ |
59 | #define RESERVE_COUNT 2 |
60 | static int reserve_count = RESERVE_COUNT; | |
61 | static int buffer_count; | |
d4669f0b | 62 | |
df323337 SAS |
63 | static LIST_HEAD(aa_global_buffers); |
64 | static DEFINE_SPINLOCK(aa_buffers_lock); | |
ea9bae12 | 65 | static DEFINE_PER_CPU(struct aa_local_cache, aa_local_buffers); |
d4669f0b | 66 | |
b5e95b48 JJ |
67 | /* |
68 | * LSM hook functions | |
69 | */ | |
70 | ||
71 | /* | |
d9087c49 | 72 | * put the associated labels |
b5e95b48 JJ |
73 | */ |
74 | static void apparmor_cred_free(struct cred *cred) | |
75 | { | |
d9087c49 | 76 | aa_put_label(cred_label(cred)); |
69b5a44a | 77 | set_cred_label(cred, NULL); |
b5e95b48 JJ |
78 | } |
79 | ||
80 | /* | |
81 | * allocate the apparmor part of blank credentials | |
82 | */ | |
83 | static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
84 | { | |
69b5a44a | 85 | set_cred_label(cred, NULL); |
b5e95b48 JJ |
86 | return 0; |
87 | } | |
88 | ||
89 | /* | |
d9087c49 | 90 | * prepare new cred label for modification by prepare_cred block |
b5e95b48 JJ |
91 | */ |
92 | static int apparmor_cred_prepare(struct cred *new, const struct cred *old, | |
93 | gfp_t gfp) | |
94 | { | |
69b5a44a | 95 | set_cred_label(new, aa_get_newest_label(cred_label(old))); |
b5e95b48 JJ |
96 | return 0; |
97 | } | |
98 | ||
99 | /* | |
100 | * transfer the apparmor data to a blank set of creds | |
101 | */ | |
102 | static void apparmor_cred_transfer(struct cred *new, const struct cred *old) | |
103 | { | |
69b5a44a | 104 | set_cred_label(new, aa_get_newest_label(cred_label(old))); |
b5e95b48 JJ |
105 | } |
106 | ||
3b529a76 JJ |
107 | static void apparmor_task_free(struct task_struct *task) |
108 | { | |
109 | ||
110 | aa_free_task_ctx(task_ctx(task)); | |
3b529a76 JJ |
111 | } |
112 | ||
113 | static int apparmor_task_alloc(struct task_struct *task, | |
114 | unsigned long clone_flags) | |
115 | { | |
f4ad8f2c | 116 | struct aa_task_ctx *new = task_ctx(task); |
3b529a76 | 117 | |
de62de59 | 118 | aa_dup_task_ctx(new, task_ctx(current)); |
b5e95b48 | 119 | |
3b529a76 | 120 | return 0; |
b5e95b48 JJ |
121 | } |
122 | ||
123 | static int apparmor_ptrace_access_check(struct task_struct *child, | |
124 | unsigned int mode) | |
125 | { | |
b2d09ae4 | 126 | struct aa_label *tracer, *tracee; |
90c436a6 | 127 | const struct cred *cred; |
b2d09ae4 JJ |
128 | int error; |
129 | ||
90c436a6 JJ |
130 | cred = get_task_cred(child); |
131 | tracee = cred_label(cred); /* ref count on cred */ | |
1f8266ff | 132 | tracer = __begin_current_label_crit_section(); |
90c436a6 | 133 | error = aa_may_ptrace(current_cred(), tracer, cred, tracee, |
338d0be4 JJ |
134 | (mode & PTRACE_MODE_READ) ? AA_PTRACE_READ |
135 | : AA_PTRACE_TRACE); | |
1f8266ff | 136 | __end_current_label_crit_section(tracer); |
90c436a6 | 137 | put_cred(cred); |
b2d09ae4 JJ |
138 | |
139 | return error; | |
b5e95b48 JJ |
140 | } |
141 | ||
142 | static int apparmor_ptrace_traceme(struct task_struct *parent) | |
143 | { | |
b2d09ae4 | 144 | struct aa_label *tracer, *tracee; |
90c436a6 | 145 | const struct cred *cred; |
b2d09ae4 JJ |
146 | int error; |
147 | ||
ca3fde52 | 148 | tracee = __begin_current_label_crit_section(); |
90c436a6 JJ |
149 | cred = get_task_cred(parent); |
150 | tracer = cred_label(cred); /* ref count on cred */ | |
151 | error = aa_may_ptrace(cred, tracer, current_cred(), tracee, | |
152 | AA_PTRACE_TRACE); | |
153 | put_cred(cred); | |
ca3fde52 | 154 | __end_current_label_crit_section(tracee); |
b2d09ae4 JJ |
155 | |
156 | return error; | |
b5e95b48 JJ |
157 | } |
158 | ||
159 | /* Derived from security/commoncap.c:cap_capget */ | |
6672efbb | 160 | static int apparmor_capget(const struct task_struct *target, kernel_cap_t *effective, |
b5e95b48 JJ |
161 | kernel_cap_t *inheritable, kernel_cap_t *permitted) |
162 | { | |
637f688d | 163 | struct aa_label *label; |
b5e95b48 JJ |
164 | const struct cred *cred; |
165 | ||
166 | rcu_read_lock(); | |
167 | cred = __task_cred(target); | |
637f688d | 168 | label = aa_get_newest_cred_label(cred); |
c70c86c4 | 169 | |
b1d9e6b0 CS |
170 | /* |
171 | * cap_capget is stacked ahead of this and will | |
172 | * initialize effective and permitted. | |
173 | */ | |
c70c86c4 JJ |
174 | if (!unconfined(label)) { |
175 | struct aa_profile *profile; | |
176 | struct label_it i; | |
177 | ||
178 | label_for_each_confined(i, label, profile) { | |
1ad22fcc | 179 | struct aa_ruleset *rules; |
c70c86c4 JJ |
180 | if (COMPLAIN_MODE(profile)) |
181 | continue; | |
1ad22fcc JJ |
182 | rules = list_first_entry(&profile->rules, |
183 | typeof(*rules), list); | |
c70c86c4 | 184 | *effective = cap_intersect(*effective, |
1ad22fcc | 185 | rules->caps.allow); |
c70c86c4 | 186 | *permitted = cap_intersect(*permitted, |
1ad22fcc | 187 | rules->caps.allow); |
c70c86c4 | 188 | } |
b5e95b48 JJ |
189 | } |
190 | rcu_read_unlock(); | |
637f688d | 191 | aa_put_label(label); |
b5e95b48 JJ |
192 | |
193 | return 0; | |
194 | } | |
195 | ||
6a9de491 | 196 | static int apparmor_capable(const struct cred *cred, struct user_namespace *ns, |
c1a85a00 | 197 | int cap, unsigned int opts) |
b5e95b48 | 198 | { |
637f688d | 199 | struct aa_label *label; |
b1d9e6b0 CS |
200 | int error = 0; |
201 | ||
637f688d JJ |
202 | label = aa_get_newest_cred_label(cred); |
203 | if (!unconfined(label)) | |
90c436a6 | 204 | error = aa_capable(cred, label, cap, opts); |
637f688d | 205 | aa_put_label(label); |
cf797c0e | 206 | |
b5e95b48 JJ |
207 | return error; |
208 | } | |
209 | ||
210 | /** | |
211 | * common_perm - basic common permission check wrapper fn for paths | |
212 | * @op: operation being checked | |
213 | * @path: path to check permission of (NOT NULL) | |
214 | * @mask: requested permissions mask | |
215 | * @cond: conditional info for the permission request (NOT NULL) | |
216 | * | |
217 | * Returns: %0 else error code if error or permission denied | |
218 | */ | |
47f6e5cc | 219 | static int common_perm(const char *op, const struct path *path, u32 mask, |
b5e95b48 JJ |
220 | struct path_cond *cond) |
221 | { | |
637f688d | 222 | struct aa_label *label; |
b5e95b48 JJ |
223 | int error = 0; |
224 | ||
637f688d JJ |
225 | label = __begin_current_label_crit_section(); |
226 | if (!unconfined(label)) | |
90c436a6 JJ |
227 | error = aa_path_perm(op, current_cred(), label, path, 0, mask, |
228 | cond); | |
637f688d | 229 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
230 | |
231 | return error; | |
232 | } | |
233 | ||
234 | /** | |
31f75bfe | 235 | * common_perm_cond - common permission wrapper around inode cond |
b5e95b48 | 236 | * @op: operation being checked |
31f75bfe | 237 | * @path: location to check (NOT NULL) |
b5e95b48 | 238 | * @mask: requested permissions mask |
b5e95b48 JJ |
239 | * |
240 | * Returns: %0 else error code if error or permission denied | |
241 | */ | |
31f75bfe | 242 | static int common_perm_cond(const char *op, const struct path *path, u32 mask) |
b5e95b48 | 243 | { |
e67fe633 | 244 | vfsuid_t vfsuid = i_uid_into_vfsuid(mnt_idmap(path->mnt), |
5e26a01e | 245 | d_backing_inode(path->dentry)); |
3cee6079 | 246 | struct path_cond cond = { |
5e26a01e | 247 | vfsuid_into_kuid(vfsuid), |
3cee6079 | 248 | d_backing_inode(path->dentry)->i_mode |
31f75bfe | 249 | }; |
b5e95b48 | 250 | |
31f75bfe JJ |
251 | if (!path_mediated_fs(path->dentry)) |
252 | return 0; | |
253 | ||
254 | return common_perm(op, path, mask, &cond); | |
b5e95b48 JJ |
255 | } |
256 | ||
257 | /** | |
31f75bfe | 258 | * common_perm_dir_dentry - common permission wrapper when path is dir, dentry |
b5e95b48 | 259 | * @op: operation being checked |
31f75bfe JJ |
260 | * @dir: directory of the dentry (NOT NULL) |
261 | * @dentry: dentry to check (NOT NULL) | |
b5e95b48 | 262 | * @mask: requested permissions mask |
31f75bfe | 263 | * @cond: conditional info for the permission request (NOT NULL) |
b5e95b48 JJ |
264 | * |
265 | * Returns: %0 else error code if error or permission denied | |
266 | */ | |
31f75bfe JJ |
267 | static int common_perm_dir_dentry(const char *op, const struct path *dir, |
268 | struct dentry *dentry, u32 mask, | |
269 | struct path_cond *cond) | |
b5e95b48 | 270 | { |
31f75bfe | 271 | struct path path = { .mnt = dir->mnt, .dentry = dentry }; |
b5e95b48 | 272 | |
31f75bfe | 273 | return common_perm(op, &path, mask, cond); |
b5e95b48 JJ |
274 | } |
275 | ||
276 | /** | |
277 | * common_perm_rm - common permission wrapper for operations doing rm | |
278 | * @op: operation being checked | |
279 | * @dir: directory that the dentry is in (NOT NULL) | |
280 | * @dentry: dentry being rm'd (NOT NULL) | |
281 | * @mask: requested permission mask | |
282 | * | |
283 | * Returns: %0 else error code if error or permission denied | |
284 | */ | |
47f6e5cc | 285 | static int common_perm_rm(const char *op, const struct path *dir, |
b5e95b48 JJ |
286 | struct dentry *dentry, u32 mask) |
287 | { | |
c6f493d6 | 288 | struct inode *inode = d_backing_inode(dentry); |
b5e95b48 | 289 | struct path_cond cond = { }; |
5e26a01e | 290 | vfsuid_t vfsuid; |
b5e95b48 | 291 | |
efeee83a | 292 | if (!inode || !path_mediated_fs(dentry)) |
b5e95b48 JJ |
293 | return 0; |
294 | ||
e67fe633 | 295 | vfsuid = i_uid_into_vfsuid(mnt_idmap(dir->mnt), inode); |
5e26a01e | 296 | cond.uid = vfsuid_into_kuid(vfsuid); |
b5e95b48 JJ |
297 | cond.mode = inode->i_mode; |
298 | ||
299 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
300 | } | |
301 | ||
302 | /** | |
303 | * common_perm_create - common permission wrapper for operations doing create | |
304 | * @op: operation being checked | |
305 | * @dir: directory that dentry will be created in (NOT NULL) | |
306 | * @dentry: dentry to create (NOT NULL) | |
307 | * @mask: request permission mask | |
308 | * @mode: created file mode | |
309 | * | |
310 | * Returns: %0 else error code if error or permission denied | |
311 | */ | |
47f6e5cc | 312 | static int common_perm_create(const char *op, const struct path *dir, |
d6b49f7a | 313 | struct dentry *dentry, u32 mask, umode_t mode) |
b5e95b48 JJ |
314 | { |
315 | struct path_cond cond = { current_fsuid(), mode }; | |
316 | ||
efeee83a | 317 | if (!path_mediated_fs(dir->dentry)) |
b5e95b48 JJ |
318 | return 0; |
319 | ||
320 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
321 | } | |
322 | ||
989f74e0 | 323 | static int apparmor_path_unlink(const struct path *dir, struct dentry *dentry) |
b5e95b48 JJ |
324 | { |
325 | return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE); | |
326 | } | |
327 | ||
d3607752 | 328 | static int apparmor_path_mkdir(const struct path *dir, struct dentry *dentry, |
4572befe | 329 | umode_t mode) |
b5e95b48 JJ |
330 | { |
331 | return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE, | |
332 | S_IFDIR); | |
333 | } | |
334 | ||
989f74e0 | 335 | static int apparmor_path_rmdir(const struct path *dir, struct dentry *dentry) |
b5e95b48 JJ |
336 | { |
337 | return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE); | |
338 | } | |
339 | ||
d3607752 | 340 | static int apparmor_path_mknod(const struct path *dir, struct dentry *dentry, |
04fc66e7 | 341 | umode_t mode, unsigned int dev) |
b5e95b48 JJ |
342 | { |
343 | return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode); | |
344 | } | |
345 | ||
81f4c506 | 346 | static int apparmor_path_truncate(const struct path *path) |
b5e95b48 | 347 | { |
e53cfe6c | 348 | return common_perm_cond(OP_TRUNC, path, MAY_WRITE | AA_MAY_SETATTR); |
b5e95b48 JJ |
349 | } |
350 | ||
3350607d GN |
351 | static int apparmor_file_truncate(struct file *file) |
352 | { | |
353 | return apparmor_path_truncate(&file->f_path); | |
354 | } | |
355 | ||
d3607752 | 356 | static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry, |
b5e95b48 JJ |
357 | const char *old_name) |
358 | { | |
359 | return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE, | |
360 | S_IFLNK); | |
361 | } | |
362 | ||
3ccee46a | 363 | static int apparmor_path_link(struct dentry *old_dentry, const struct path *new_dir, |
b5e95b48 JJ |
364 | struct dentry *new_dentry) |
365 | { | |
637f688d | 366 | struct aa_label *label; |
b5e95b48 JJ |
367 | int error = 0; |
368 | ||
efeee83a | 369 | if (!path_mediated_fs(old_dentry)) |
b5e95b48 JJ |
370 | return 0; |
371 | ||
637f688d JJ |
372 | label = begin_current_label_crit_section(); |
373 | if (!unconfined(label)) | |
90c436a6 JJ |
374 | error = aa_path_link(current_cred(), label, old_dentry, new_dir, |
375 | new_dentry); | |
637f688d | 376 | end_current_label_crit_section(label); |
cf797c0e | 377 | |
b5e95b48 JJ |
378 | return error; |
379 | } | |
380 | ||
3ccee46a | 381 | static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry, |
100f59d9 MS |
382 | const struct path *new_dir, struct dentry *new_dentry, |
383 | const unsigned int flags) | |
b5e95b48 | 384 | { |
637f688d | 385 | struct aa_label *label; |
b5e95b48 JJ |
386 | int error = 0; |
387 | ||
efeee83a | 388 | if (!path_mediated_fs(old_dentry)) |
b5e95b48 | 389 | return 0; |
100f59d9 MS |
390 | if ((flags & RENAME_EXCHANGE) && !path_mediated_fs(new_dentry)) |
391 | return 0; | |
b5e95b48 | 392 | |
637f688d JJ |
393 | label = begin_current_label_crit_section(); |
394 | if (!unconfined(label)) { | |
e67fe633 | 395 | struct mnt_idmap *idmap = mnt_idmap(old_dir->mnt); |
5e26a01e | 396 | vfsuid_t vfsuid; |
8486adf0 KC |
397 | struct path old_path = { .mnt = old_dir->mnt, |
398 | .dentry = old_dentry }; | |
399 | struct path new_path = { .mnt = new_dir->mnt, | |
400 | .dentry = new_dentry }; | |
3cee6079 | 401 | struct path_cond cond = { |
5e26a01e | 402 | .mode = d_backing_inode(old_dentry)->i_mode |
b5e95b48 | 403 | }; |
e67fe633 | 404 | vfsuid = i_uid_into_vfsuid(idmap, d_backing_inode(old_dentry)); |
5e26a01e | 405 | cond.uid = vfsuid_into_kuid(vfsuid); |
b5e95b48 | 406 | |
100f59d9 MS |
407 | if (flags & RENAME_EXCHANGE) { |
408 | struct path_cond cond_exchange = { | |
5e26a01e | 409 | .mode = d_backing_inode(new_dentry)->i_mode, |
100f59d9 | 410 | }; |
e67fe633 | 411 | vfsuid = i_uid_into_vfsuid(idmap, d_backing_inode(old_dentry)); |
5e26a01e | 412 | cond_exchange.uid = vfsuid_into_kuid(vfsuid); |
100f59d9 | 413 | |
90c436a6 JJ |
414 | error = aa_path_perm(OP_RENAME_SRC, current_cred(), |
415 | label, &new_path, 0, | |
100f59d9 MS |
416 | MAY_READ | AA_MAY_GETATTR | MAY_WRITE | |
417 | AA_MAY_SETATTR | AA_MAY_DELETE, | |
418 | &cond_exchange); | |
419 | if (!error) | |
90c436a6 JJ |
420 | error = aa_path_perm(OP_RENAME_DEST, current_cred(), |
421 | label, &old_path, | |
100f59d9 MS |
422 | 0, MAY_WRITE | AA_MAY_SETATTR | |
423 | AA_MAY_CREATE, &cond_exchange); | |
424 | } | |
425 | ||
426 | if (!error) | |
90c436a6 JJ |
427 | error = aa_path_perm(OP_RENAME_SRC, current_cred(), |
428 | label, &old_path, 0, | |
100f59d9 MS |
429 | MAY_READ | AA_MAY_GETATTR | MAY_WRITE | |
430 | AA_MAY_SETATTR | AA_MAY_DELETE, | |
431 | &cond); | |
b5e95b48 | 432 | if (!error) |
90c436a6 JJ |
433 | error = aa_path_perm(OP_RENAME_DEST, current_cred(), |
434 | label, &new_path, | |
e53cfe6c | 435 | 0, MAY_WRITE | AA_MAY_SETATTR | |
b5e95b48 JJ |
436 | AA_MAY_CREATE, &cond); |
437 | ||
438 | } | |
637f688d | 439 | end_current_label_crit_section(label); |
cf797c0e | 440 | |
b5e95b48 JJ |
441 | return error; |
442 | } | |
443 | ||
be01f9f2 | 444 | static int apparmor_path_chmod(const struct path *path, umode_t mode) |
b5e95b48 | 445 | { |
31f75bfe | 446 | return common_perm_cond(OP_CHMOD, path, AA_MAY_CHMOD); |
b5e95b48 JJ |
447 | } |
448 | ||
7fd25dac | 449 | static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid) |
b5e95b48 | 450 | { |
31f75bfe | 451 | return common_perm_cond(OP_CHOWN, path, AA_MAY_CHOWN); |
b5e95b48 JJ |
452 | } |
453 | ||
3f7036a0 | 454 | static int apparmor_inode_getattr(const struct path *path) |
b5e95b48 | 455 | { |
e53cfe6c | 456 | return common_perm_cond(OP_GETATTR, path, AA_MAY_GETATTR); |
b5e95b48 JJ |
457 | } |
458 | ||
94817692 | 459 | static int apparmor_file_open(struct file *file) |
b5e95b48 | 460 | { |
637f688d JJ |
461 | struct aa_file_ctx *fctx = file_ctx(file); |
462 | struct aa_label *label; | |
b5e95b48 JJ |
463 | int error = 0; |
464 | ||
efeee83a | 465 | if (!path_mediated_fs(file->f_path.dentry)) |
b5e95b48 JJ |
466 | return 0; |
467 | ||
468 | /* If in exec, permission is handled by bprm hooks. | |
469 | * Cache permissions granted by the previous exec check, with | |
470 | * implicit read and executable mmap which are required to | |
471 | * actually execute the image. | |
4759ff71 KC |
472 | * |
473 | * Illogically, FMODE_EXEC is in f_flags, not f_mode. | |
b5e95b48 | 474 | */ |
4759ff71 | 475 | if (file->f_flags & __FMODE_EXEC) { |
55a26ebf | 476 | fctx->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP; |
b5e95b48 JJ |
477 | return 0; |
478 | } | |
479 | ||
94817692 | 480 | label = aa_get_newest_cred_label(file->f_cred); |
637f688d | 481 | if (!unconfined(label)) { |
e67fe633 | 482 | struct mnt_idmap *idmap = file_mnt_idmap(file); |
496ad9aa | 483 | struct inode *inode = file_inode(file); |
5e26a01e | 484 | vfsuid_t vfsuid; |
3cee6079 | 485 | struct path_cond cond = { |
5e26a01e | 486 | .mode = inode->i_mode, |
3cee6079 | 487 | }; |
e67fe633 | 488 | vfsuid = i_uid_into_vfsuid(idmap, inode); |
5e26a01e | 489 | cond.uid = vfsuid_into_kuid(vfsuid); |
b5e95b48 | 490 | |
90c436a6 JJ |
491 | error = aa_path_perm(OP_OPEN, file->f_cred, |
492 | label, &file->f_path, 0, | |
b5e95b48 JJ |
493 | aa_map_file_to_perms(file), &cond); |
494 | /* todo cache full allowed permissions set and state */ | |
55a26ebf | 495 | fctx->allow = aa_map_file_to_perms(file); |
b5e95b48 | 496 | } |
637f688d | 497 | aa_put_label(label); |
b5e95b48 JJ |
498 | |
499 | return error; | |
500 | } | |
501 | ||
502 | static int apparmor_file_alloc_security(struct file *file) | |
503 | { | |
33bf60ca | 504 | struct aa_file_ctx *ctx = file_ctx(file); |
637f688d | 505 | struct aa_label *label = begin_current_label_crit_section(); |
b5e95b48 | 506 | |
33bf60ca CS |
507 | spin_lock_init(&ctx->lock); |
508 | rcu_assign_pointer(ctx->label, aa_get_label(label)); | |
509 | end_current_label_crit_section(label); | |
510 | return 0; | |
b5e95b48 JJ |
511 | } |
512 | ||
513 | static void apparmor_file_free_security(struct file *file) | |
514 | { | |
33bf60ca CS |
515 | struct aa_file_ctx *ctx = file_ctx(file); |
516 | ||
517 | if (ctx) | |
518 | aa_put_label(rcu_access_pointer(ctx->label)); | |
b5e95b48 JJ |
519 | } |
520 | ||
341c1fda JJ |
521 | static int common_file_perm(const char *op, struct file *file, u32 mask, |
522 | bool in_atomic) | |
b5e95b48 | 523 | { |
190a9518 | 524 | struct aa_label *label; |
b5e95b48 JJ |
525 | int error = 0; |
526 | ||
192ca6b5 JJ |
527 | /* don't reaudit files closed during inheritance */ |
528 | if (file->f_path.dentry == aa_null.dentry) | |
529 | return -EACCES; | |
530 | ||
637f688d | 531 | label = __begin_current_label_crit_section(); |
90c436a6 | 532 | error = aa_file_perm(op, current_cred(), label, file, mask, in_atomic); |
637f688d | 533 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
534 | |
535 | return error; | |
536 | } | |
537 | ||
064dc947 JJ |
538 | static int apparmor_file_receive(struct file *file) |
539 | { | |
341c1fda JJ |
540 | return common_file_perm(OP_FRECEIVE, file, aa_map_file_to_perms(file), |
541 | false); | |
064dc947 JJ |
542 | } |
543 | ||
b5e95b48 JJ |
544 | static int apparmor_file_permission(struct file *file, int mask) |
545 | { | |
341c1fda | 546 | return common_file_perm(OP_FPERM, file, mask, false); |
b5e95b48 JJ |
547 | } |
548 | ||
549 | static int apparmor_file_lock(struct file *file, unsigned int cmd) | |
550 | { | |
551 | u32 mask = AA_MAY_LOCK; | |
552 | ||
553 | if (cmd == F_WRLCK) | |
554 | mask |= MAY_WRITE; | |
555 | ||
341c1fda | 556 | return common_file_perm(OP_FLOCK, file, mask, false); |
b5e95b48 JJ |
557 | } |
558 | ||
47f6e5cc | 559 | static int common_mmap(const char *op, struct file *file, unsigned long prot, |
341c1fda | 560 | unsigned long flags, bool in_atomic) |
b5e95b48 | 561 | { |
b5e95b48 JJ |
562 | int mask = 0; |
563 | ||
637f688d | 564 | if (!file || !file_ctx(file)) |
b5e95b48 JJ |
565 | return 0; |
566 | ||
567 | if (prot & PROT_READ) | |
568 | mask |= MAY_READ; | |
569 | /* | |
570 | * Private mappings don't require write perms since they don't | |
571 | * write back to the files | |
572 | */ | |
573 | if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE)) | |
574 | mask |= MAY_WRITE; | |
575 | if (prot & PROT_EXEC) | |
576 | mask |= AA_EXEC_MMAP; | |
577 | ||
341c1fda | 578 | return common_file_perm(op, file, mask, in_atomic); |
b5e95b48 JJ |
579 | } |
580 | ||
e5467859 AV |
581 | static int apparmor_mmap_file(struct file *file, unsigned long reqprot, |
582 | unsigned long prot, unsigned long flags) | |
b5e95b48 | 583 | { |
341c1fda | 584 | return common_mmap(OP_FMMAP, file, prot, flags, GFP_ATOMIC); |
b5e95b48 JJ |
585 | } |
586 | ||
587 | static int apparmor_file_mprotect(struct vm_area_struct *vma, | |
588 | unsigned long reqprot, unsigned long prot) | |
589 | { | |
590 | return common_mmap(OP_FMPROT, vma->vm_file, prot, | |
341c1fda JJ |
591 | !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0, |
592 | false); | |
b5e95b48 JJ |
593 | } |
594 | ||
c4371d90 GG |
595 | #ifdef CONFIG_IO_URING |
596 | static const char *audit_uring_mask(u32 mask) | |
597 | { | |
598 | if (mask & AA_MAY_CREATE_SQPOLL) | |
599 | return "sqpoll"; | |
600 | if (mask & AA_MAY_OVERRIDE_CRED) | |
601 | return "override_creds"; | |
602 | return ""; | |
603 | } | |
604 | ||
605 | static void audit_uring_cb(struct audit_buffer *ab, void *va) | |
606 | { | |
607 | struct apparmor_audit_data *ad = aad_of_va(va); | |
608 | ||
609 | if (ad->request & AA_URING_PERM_MASK) { | |
610 | audit_log_format(ab, " requested=\"%s\"", | |
611 | audit_uring_mask(ad->request)); | |
612 | if (ad->denied & AA_URING_PERM_MASK) { | |
613 | audit_log_format(ab, " denied=\"%s\"", | |
614 | audit_uring_mask(ad->denied)); | |
615 | } | |
616 | } | |
617 | if (ad->uring.target) { | |
618 | audit_log_format(ab, " tcontext="); | |
619 | aa_label_xaudit(ab, labels_ns(ad->subj_label), | |
620 | ad->uring.target, | |
621 | FLAGS_NONE, GFP_ATOMIC); | |
622 | } | |
623 | } | |
624 | ||
625 | static int profile_uring(struct aa_profile *profile, u32 request, | |
626 | struct aa_label *new, int cap, | |
627 | struct apparmor_audit_data *ad) | |
628 | { | |
629 | unsigned int state; | |
630 | struct aa_ruleset *rules; | |
631 | int error = 0; | |
632 | ||
633 | AA_BUG(!profile); | |
634 | ||
635 | rules = list_first_entry(&profile->rules, typeof(*rules), list); | |
636 | state = RULE_MEDIATES(rules, AA_CLASS_IO_URING); | |
637 | if (state) { | |
638 | struct aa_perms perms = { }; | |
639 | ||
640 | if (new) { | |
641 | aa_label_match(profile, rules, new, state, | |
642 | false, request, &perms); | |
643 | } else { | |
644 | perms = *aa_lookup_perms(rules->policy, state); | |
645 | } | |
646 | aa_apply_modes_to_perms(profile, &perms); | |
647 | error = aa_check_perms(profile, &perms, request, ad, | |
648 | audit_uring_cb); | |
649 | } | |
650 | ||
651 | return error; | |
652 | } | |
653 | ||
654 | /** | |
655 | * apparmor_uring_override_creds - check the requested cred override | |
656 | * @new: the target creds | |
657 | * | |
658 | * Check to see if the current task is allowed to override it's credentials | |
659 | * to service an io_uring operation. | |
660 | */ | |
7060d3cc | 661 | static int apparmor_uring_override_creds(const struct cred *new) |
c4371d90 GG |
662 | { |
663 | struct aa_profile *profile; | |
664 | struct aa_label *label; | |
665 | int error; | |
666 | DEFINE_AUDIT_DATA(ad, LSM_AUDIT_DATA_NONE, AA_CLASS_IO_URING, | |
667 | OP_URING_OVERRIDE); | |
668 | ||
669 | ad.uring.target = cred_label(new); | |
670 | label = __begin_current_label_crit_section(); | |
671 | error = fn_for_each(label, profile, | |
672 | profile_uring(profile, AA_MAY_OVERRIDE_CRED, | |
673 | cred_label(new), CAP_SYS_ADMIN, &ad)); | |
674 | __end_current_label_crit_section(label); | |
675 | ||
676 | return error; | |
677 | } | |
678 | ||
679 | /** | |
680 | * apparmor_uring_sqpoll - check if a io_uring polling thread can be created | |
681 | * | |
682 | * Check to see if the current task is allowed to create a new io_uring | |
683 | * kernel polling thread. | |
684 | */ | |
7060d3cc | 685 | static int apparmor_uring_sqpoll(void) |
c4371d90 GG |
686 | { |
687 | struct aa_profile *profile; | |
688 | struct aa_label *label; | |
689 | int error; | |
690 | DEFINE_AUDIT_DATA(ad, LSM_AUDIT_DATA_NONE, AA_CLASS_IO_URING, | |
691 | OP_URING_SQPOLL); | |
692 | ||
693 | label = __begin_current_label_crit_section(); | |
694 | error = fn_for_each(label, profile, | |
695 | profile_uring(profile, AA_MAY_CREATE_SQPOLL, | |
696 | NULL, CAP_SYS_ADMIN, &ad)); | |
697 | __end_current_label_crit_section(label); | |
698 | ||
699 | return error; | |
700 | } | |
701 | #endif /* CONFIG_IO_URING */ | |
702 | ||
2ea3ffb7 JJ |
703 | static int apparmor_sb_mount(const char *dev_name, const struct path *path, |
704 | const char *type, unsigned long flags, void *data) | |
705 | { | |
706 | struct aa_label *label; | |
707 | int error = 0; | |
708 | ||
709 | /* Discard magic */ | |
710 | if ((flags & MS_MGC_MSK) == MS_MGC_VAL) | |
711 | flags &= ~MS_MGC_MSK; | |
712 | ||
713 | flags &= ~AA_MS_IGNORE_MASK; | |
714 | ||
715 | label = __begin_current_label_crit_section(); | |
716 | if (!unconfined(label)) { | |
717 | if (flags & MS_REMOUNT) | |
90c436a6 JJ |
718 | error = aa_remount(current_cred(), label, path, flags, |
719 | data); | |
2ea3ffb7 | 720 | else if (flags & MS_BIND) |
90c436a6 JJ |
721 | error = aa_bind_mount(current_cred(), label, path, |
722 | dev_name, flags); | |
2ea3ffb7 JJ |
723 | else if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE | |
724 | MS_UNBINDABLE)) | |
90c436a6 JJ |
725 | error = aa_mount_change_type(current_cred(), label, |
726 | path, flags); | |
2ea3ffb7 | 727 | else if (flags & MS_MOVE) |
157a3537 JJ |
728 | error = aa_move_mount_old(current_cred(), label, path, |
729 | dev_name); | |
2ea3ffb7 | 730 | else |
90c436a6 JJ |
731 | error = aa_new_mount(current_cred(), label, dev_name, |
732 | path, type, flags, data); | |
2ea3ffb7 JJ |
733 | } |
734 | __end_current_label_crit_section(label); | |
735 | ||
736 | return error; | |
737 | } | |
738 | ||
157a3537 JJ |
739 | static int apparmor_move_mount(const struct path *from_path, |
740 | const struct path *to_path) | |
741 | { | |
742 | struct aa_label *label; | |
743 | int error = 0; | |
744 | ||
745 | label = __begin_current_label_crit_section(); | |
746 | if (!unconfined(label)) | |
747 | error = aa_move_mount(current_cred(), label, from_path, | |
748 | to_path); | |
749 | __end_current_label_crit_section(label); | |
750 | ||
751 | return error; | |
752 | } | |
753 | ||
2ea3ffb7 JJ |
754 | static int apparmor_sb_umount(struct vfsmount *mnt, int flags) |
755 | { | |
756 | struct aa_label *label; | |
757 | int error = 0; | |
758 | ||
759 | label = __begin_current_label_crit_section(); | |
760 | if (!unconfined(label)) | |
90c436a6 | 761 | error = aa_umount(current_cred(), label, mnt, flags); |
2ea3ffb7 JJ |
762 | __end_current_label_crit_section(label); |
763 | ||
764 | return error; | |
765 | } | |
766 | ||
767 | static int apparmor_sb_pivotroot(const struct path *old_path, | |
768 | const struct path *new_path) | |
769 | { | |
770 | struct aa_label *label; | |
771 | int error = 0; | |
772 | ||
773 | label = aa_get_current_label(); | |
774 | if (!unconfined(label)) | |
90c436a6 | 775 | error = aa_pivotroot(current_cred(), label, old_path, new_path); |
2ea3ffb7 JJ |
776 | aa_put_label(label); |
777 | ||
778 | return error; | |
779 | } | |
780 | ||
223981db | 781 | static int apparmor_getselfattr(unsigned int attr, struct lsm_ctx __user *lx, |
a5a858f6 | 782 | u32 *size, u32 flags) |
223981db CS |
783 | { |
784 | int error = -ENOENT; | |
785 | struct aa_task_ctx *ctx = task_ctx(current); | |
786 | struct aa_label *label = NULL; | |
6d2fb472 | 787 | char *value = NULL; |
223981db CS |
788 | |
789 | switch (attr) { | |
790 | case LSM_ATTR_CURRENT: | |
791 | label = aa_get_newest_label(cred_label(current_cred())); | |
792 | break; | |
793 | case LSM_ATTR_PREV: | |
794 | if (ctx->previous) | |
795 | label = aa_get_newest_label(ctx->previous); | |
796 | break; | |
797 | case LSM_ATTR_EXEC: | |
798 | if (ctx->onexec) | |
799 | label = aa_get_newest_label(ctx->onexec); | |
800 | break; | |
801 | default: | |
802 | error = -EOPNOTSUPP; | |
803 | break; | |
804 | } | |
805 | ||
806 | if (label) { | |
807 | error = aa_getprocattr(label, &value, false); | |
d7cf3412 PM |
808 | if (error > 0) |
809 | error = lsm_fill_user_ctx(lx, size, value, error, | |
810 | LSM_ID_APPARMOR, 0); | |
223981db CS |
811 | kfree(value); |
812 | } | |
813 | ||
814 | aa_put_label(label); | |
815 | ||
223981db CS |
816 | if (error < 0) |
817 | return error; | |
818 | return 1; | |
819 | } | |
820 | ||
c8e477c6 | 821 | static int apparmor_getprocattr(struct task_struct *task, const char *name, |
b5e95b48 JJ |
822 | char **value) |
823 | { | |
824 | int error = -ENOENT; | |
b5e95b48 JJ |
825 | /* released below */ |
826 | const struct cred *cred = get_task_cred(task); | |
de62de59 | 827 | struct aa_task_ctx *ctx = task_ctx(current); |
637f688d | 828 | struct aa_label *label = NULL; |
b5e95b48 JJ |
829 | |
830 | if (strcmp(name, "current") == 0) | |
d9087c49 | 831 | label = aa_get_newest_label(cred_label(cred)); |
55a26ebf | 832 | else if (strcmp(name, "prev") == 0 && ctx->previous) |
637f688d | 833 | label = aa_get_newest_label(ctx->previous); |
55a26ebf | 834 | else if (strcmp(name, "exec") == 0 && ctx->onexec) |
637f688d | 835 | label = aa_get_newest_label(ctx->onexec); |
b5e95b48 JJ |
836 | else |
837 | error = -EINVAL; | |
838 | ||
637f688d | 839 | if (label) |
223981db | 840 | error = aa_getprocattr(label, value, true); |
77b071b3 | 841 | |
637f688d | 842 | aa_put_label(label); |
b5e95b48 JJ |
843 | put_cred(cred); |
844 | ||
845 | return error; | |
846 | } | |
847 | ||
223981db | 848 | static int do_setattr(u64 attr, void *value, size_t size) |
b5e95b48 | 849 | { |
e89b8081 | 850 | char *command, *largs = NULL, *args = value; |
b5e95b48 JJ |
851 | size_t arg_size; |
852 | int error; | |
bd7bd201 | 853 | DEFINE_AUDIT_DATA(ad, LSM_AUDIT_DATA_NONE, AA_CLASS_NONE, |
8c4b785a | 854 | OP_SETPROCATTR); |
b5e95b48 JJ |
855 | |
856 | if (size == 0) | |
857 | return -EINVAL; | |
b5e95b48 | 858 | |
e89b8081 VN |
859 | /* AppArmor requires that the buffer must be null terminated atm */ |
860 | if (args[size - 1] != '\0') { | |
861 | /* null terminate */ | |
862 | largs = args = kmalloc(size + 1, GFP_KERNEL); | |
863 | if (!args) | |
864 | return -ENOMEM; | |
865 | memcpy(args, value, size); | |
866 | args[size] = '\0'; | |
867 | } | |
868 | ||
869 | error = -EINVAL; | |
b5e95b48 JJ |
870 | args = strim(args); |
871 | command = strsep(&args, " "); | |
872 | if (!args) | |
e89b8081 | 873 | goto out; |
b5e95b48 JJ |
874 | args = skip_spaces(args); |
875 | if (!*args) | |
e89b8081 | 876 | goto out; |
b5e95b48 | 877 | |
d4d03f74 | 878 | arg_size = size - (args - (largs ? largs : (char *) value)); |
223981db | 879 | if (attr == LSM_ATTR_CURRENT) { |
b5e95b48 JJ |
880 | if (strcmp(command, "changehat") == 0) { |
881 | error = aa_setprocattr_changehat(args, arg_size, | |
df8073c6 | 882 | AA_CHANGE_NOFLAGS); |
b5e95b48 JJ |
883 | } else if (strcmp(command, "permhat") == 0) { |
884 | error = aa_setprocattr_changehat(args, arg_size, | |
df8073c6 | 885 | AA_CHANGE_TEST); |
b5e95b48 | 886 | } else if (strcmp(command, "changeprofile") == 0) { |
df8073c6 | 887 | error = aa_change_profile(args, AA_CHANGE_NOFLAGS); |
b5e95b48 | 888 | } else if (strcmp(command, "permprofile") == 0) { |
df8073c6 | 889 | error = aa_change_profile(args, AA_CHANGE_TEST); |
6c5fc8f1 JJ |
890 | } else if (strcmp(command, "stack") == 0) { |
891 | error = aa_change_profile(args, AA_CHANGE_STACK); | |
3eea57c2 JJ |
892 | } else |
893 | goto fail; | |
223981db | 894 | } else if (attr == LSM_ATTR_EXEC) { |
3eea57c2 | 895 | if (strcmp(command, "exec") == 0) |
df8073c6 | 896 | error = aa_change_profile(args, AA_CHANGE_ONEXEC); |
6c5fc8f1 JJ |
897 | else if (strcmp(command, "stack") == 0) |
898 | error = aa_change_profile(args, (AA_CHANGE_ONEXEC | | |
899 | AA_CHANGE_STACK)); | |
3eea57c2 JJ |
900 | else |
901 | goto fail; | |
902 | } else | |
b5e95b48 | 903 | /* only support the "current" and "exec" process attributes */ |
e89b8081 | 904 | goto fail; |
3eea57c2 | 905 | |
b5e95b48 JJ |
906 | if (!error) |
907 | error = size; | |
e89b8081 VN |
908 | out: |
909 | kfree(largs); | |
b5e95b48 | 910 | return error; |
3eea57c2 JJ |
911 | |
912 | fail: | |
d20f5a1a | 913 | ad.subj_label = begin_current_label_crit_section(); |
223981db CS |
914 | if (attr == LSM_ATTR_CURRENT) |
915 | ad.info = "current"; | |
916 | else if (attr == LSM_ATTR_EXEC) | |
917 | ad.info = "exec"; | |
918 | else | |
919 | ad.info = "invalid"; | |
bd7bd201 JJ |
920 | ad.error = error = -EINVAL; |
921 | aa_audit_msg(AUDIT_APPARMOR_DENIED, &ad, NULL); | |
d20f5a1a | 922 | end_current_label_crit_section(ad.subj_label); |
e89b8081 | 923 | goto out; |
b5e95b48 JJ |
924 | } |
925 | ||
223981db | 926 | static int apparmor_setselfattr(unsigned int attr, struct lsm_ctx *ctx, |
a5a858f6 | 927 | u32 size, u32 flags) |
223981db CS |
928 | { |
929 | int rc; | |
930 | ||
931 | if (attr != LSM_ATTR_CURRENT && attr != LSM_ATTR_EXEC) | |
932 | return -EOPNOTSUPP; | |
933 | ||
934 | rc = do_setattr(attr, ctx->ctx, ctx->ctx_len); | |
935 | if (rc > 0) | |
936 | return 0; | |
937 | return rc; | |
938 | } | |
939 | ||
940 | static int apparmor_setprocattr(const char *name, void *value, | |
941 | size_t size) | |
942 | { | |
943 | int attr = lsm_name_to_attr(name); | |
944 | ||
945 | if (attr) | |
946 | return do_setattr(attr, value, size); | |
947 | return -EINVAL; | |
948 | } | |
949 | ||
fe864821 JJ |
950 | /** |
951 | * apparmor_bprm_committing_creds - do task cleanup on committing new creds | |
952 | * @bprm: binprm for the exec (NOT NULL) | |
953 | */ | |
64fc9526 | 954 | static void apparmor_bprm_committing_creds(const struct linux_binprm *bprm) |
fe864821 | 955 | { |
637f688d | 956 | struct aa_label *label = aa_current_raw_label(); |
d9087c49 | 957 | struct aa_label *new_label = cred_label(bprm->cred); |
fe864821 JJ |
958 | |
959 | /* bail out if unconfined or not changing profile */ | |
d9087c49 JJ |
960 | if ((new_label->proxy == label->proxy) || |
961 | (unconfined(new_label))) | |
fe864821 JJ |
962 | return; |
963 | ||
192ca6b5 JJ |
964 | aa_inherit_files(bprm->cred, current->files); |
965 | ||
fe864821 JJ |
966 | current->pdeath_signal = 0; |
967 | ||
637f688d | 968 | /* reset soft limits and set hard limits for the new label */ |
d9087c49 | 969 | __aa_transition_rlimits(label, new_label); |
fe864821 JJ |
970 | } |
971 | ||
972 | /** | |
391f1211 | 973 | * apparmor_bprm_committed_creds() - do cleanup after new creds committed |
fe864821 JJ |
974 | * @bprm: binprm for the exec (NOT NULL) |
975 | */ | |
a721f7b8 | 976 | static void apparmor_bprm_committed_creds(const struct linux_binprm *bprm) |
fe864821 | 977 | { |
3b529a76 | 978 | /* clear out temporary/transitional state from the context */ |
de62de59 | 979 | aa_clear_task_ctx_trans(task_ctx(current)); |
3b529a76 | 980 | |
fe864821 JJ |
981 | return; |
982 | } | |
983 | ||
6326948f PM |
984 | static void apparmor_current_getsecid_subj(u32 *secid) |
985 | { | |
2516fde1 | 986 | struct aa_label *label = __begin_current_label_crit_section(); |
6326948f | 987 | *secid = label->secid; |
2516fde1 | 988 | __end_current_label_crit_section(label); |
6326948f PM |
989 | } |
990 | ||
991 | static void apparmor_task_getsecid_obj(struct task_struct *p, u32 *secid) | |
a7ae3645 JJ |
992 | { |
993 | struct aa_label *label = aa_get_task_label(p); | |
994 | *secid = label->secid; | |
995 | aa_put_label(label); | |
996 | } | |
997 | ||
7cb4dc9f JS |
998 | static int apparmor_task_setrlimit(struct task_struct *task, |
999 | unsigned int resource, struct rlimit *new_rlim) | |
b5e95b48 | 1000 | { |
637f688d | 1001 | struct aa_label *label = __begin_current_label_crit_section(); |
b5e95b48 JJ |
1002 | int error = 0; |
1003 | ||
637f688d | 1004 | if (!unconfined(label)) |
90c436a6 JJ |
1005 | error = aa_task_setrlimit(current_cred(), label, task, |
1006 | resource, new_rlim); | |
637f688d | 1007 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
1008 | |
1009 | return error; | |
1010 | } | |
1011 | ||
ae7795bc | 1012 | static int apparmor_task_kill(struct task_struct *target, struct kernel_siginfo *info, |
6b4f3d01 | 1013 | int sig, const struct cred *cred) |
cd1dbf76 | 1014 | { |
90c436a6 | 1015 | const struct cred *tc; |
cd1dbf76 JJ |
1016 | struct aa_label *cl, *tl; |
1017 | int error; | |
1018 | ||
90c436a6 JJ |
1019 | tc = get_task_cred(target); |
1020 | tl = aa_get_newest_cred_label(tc); | |
6b4f3d01 SS |
1021 | if (cred) { |
1022 | /* | |
1023 | * Dealing with USB IO specific behavior | |
cd1dbf76 | 1024 | */ |
6b4f3d01 | 1025 | cl = aa_get_newest_cred_label(cred); |
90c436a6 | 1026 | error = aa_may_signal(cred, cl, tc, tl, sig); |
6b4f3d01 | 1027 | aa_put_label(cl); |
90c436a6 JJ |
1028 | } else { |
1029 | cl = __begin_current_label_crit_section(); | |
1030 | error = aa_may_signal(current_cred(), cl, tc, tl, sig); | |
1031 | __end_current_label_crit_section(cl); | |
6b4f3d01 | 1032 | } |
cd1dbf76 | 1033 | aa_put_label(tl); |
90c436a6 | 1034 | put_cred(tc); |
cd1dbf76 JJ |
1035 | |
1036 | return error; | |
1037 | } | |
1038 | ||
fa9b63ad JJ |
1039 | static int apparmor_userns_create(const struct cred *cred) |
1040 | { | |
1041 | struct aa_label *label; | |
1042 | struct aa_profile *profile; | |
1043 | int error = 0; | |
1044 | DEFINE_AUDIT_DATA(ad, LSM_AUDIT_DATA_TASK, AA_CLASS_NS, | |
1045 | OP_USERNS_CREATE); | |
1046 | ||
1047 | ad.subj_cred = current_cred(); | |
1048 | ||
1049 | label = begin_current_label_crit_section(); | |
1050 | if (!unconfined(label)) { | |
1051 | error = fn_for_each(label, profile, | |
1052 | aa_profile_ns_perm(profile, &ad, | |
1053 | AA_USERNS_CREATE)); | |
1054 | } | |
1055 | end_current_label_crit_section(label); | |
cd1dbf76 JJ |
1056 | |
1057 | return error; | |
1058 | } | |
1059 | ||
56974a6f JJ |
1060 | static int apparmor_sk_alloc_security(struct sock *sk, int family, gfp_t flags) |
1061 | { | |
1062 | struct aa_sk_ctx *ctx; | |
1063 | ||
1064 | ctx = kzalloc(sizeof(*ctx), flags); | |
1065 | if (!ctx) | |
1066 | return -ENOMEM; | |
1067 | ||
79ddd4a7 | 1068 | sk->sk_security = ctx; |
56974a6f JJ |
1069 | |
1070 | return 0; | |
1071 | } | |
1072 | ||
56974a6f JJ |
1073 | static void apparmor_sk_free_security(struct sock *sk) |
1074 | { | |
79ddd4a7 | 1075 | struct aa_sk_ctx *ctx = aa_sock(sk); |
56974a6f | 1076 | |
79ddd4a7 | 1077 | sk->sk_security = NULL; |
56974a6f JJ |
1078 | aa_put_label(ctx->label); |
1079 | aa_put_label(ctx->peer); | |
1080 | kfree(ctx); | |
1081 | } | |
1082 | ||
1083 | /** | |
0fc6ab40 | 1084 | * apparmor_sk_clone_security - clone the sk_security field |
1cba2750 JJ |
1085 | * @sk: sock to have security cloned |
1086 | * @newsk: sock getting clone | |
56974a6f JJ |
1087 | */ |
1088 | static void apparmor_sk_clone_security(const struct sock *sk, | |
1089 | struct sock *newsk) | |
1090 | { | |
79ddd4a7 JJ |
1091 | struct aa_sk_ctx *ctx = aa_sock(sk); |
1092 | struct aa_sk_ctx *new = aa_sock(newsk); | |
56974a6f | 1093 | |
3b646abc MFO |
1094 | if (new->label) |
1095 | aa_put_label(new->label); | |
56974a6f | 1096 | new->label = aa_get_label(ctx->label); |
3b646abc MFO |
1097 | |
1098 | if (new->peer) | |
1099 | aa_put_label(new->peer); | |
56974a6f JJ |
1100 | new->peer = aa_get_label(ctx->peer); |
1101 | } | |
1102 | ||
56974a6f JJ |
1103 | static int apparmor_socket_create(int family, int type, int protocol, int kern) |
1104 | { | |
1105 | struct aa_label *label; | |
1106 | int error = 0; | |
1107 | ||
1108 | AA_BUG(in_interrupt()); | |
1109 | ||
1110 | label = begin_current_label_crit_section(); | |
1111 | if (!(kern || unconfined(label))) | |
1112 | error = af_select(family, | |
1113 | create_perm(label, family, type, protocol), | |
90c436a6 JJ |
1114 | aa_af_perm(current_cred(), label, |
1115 | OP_CREATE, AA_MAY_CREATE, | |
56974a6f JJ |
1116 | family, type, protocol)); |
1117 | end_current_label_crit_section(label); | |
1118 | ||
1119 | return error; | |
1120 | } | |
1121 | ||
1122 | /** | |
1123 | * apparmor_socket_post_create - setup the per-socket security struct | |
1cba2750 JJ |
1124 | * @sock: socket that is being setup |
1125 | * @family: family of socket being created | |
1126 | * @type: type of the socket | |
1127 | * @ptotocol: protocol of the socket | |
1128 | * @kern: socket is a special kernel socket | |
56974a6f JJ |
1129 | * |
1130 | * Note: | |
1cba2750 | 1131 | * - kernel sockets labeled kernel_t used to use unconfined |
56974a6f JJ |
1132 | * - socket may not have sk here if created with sock_create_lite or |
1133 | * sock_alloc. These should be accept cases which will be handled in | |
1134 | * sock_graft. | |
1135 | */ | |
1136 | static int apparmor_socket_post_create(struct socket *sock, int family, | |
1137 | int type, int protocol, int kern) | |
1138 | { | |
1139 | struct aa_label *label; | |
1140 | ||
1141 | if (kern) { | |
95c0581f | 1142 | label = aa_get_label(kernel_t); |
56974a6f JJ |
1143 | } else |
1144 | label = aa_get_current_label(); | |
1145 | ||
1146 | if (sock->sk) { | |
79ddd4a7 | 1147 | struct aa_sk_ctx *ctx = aa_sock(sock->sk); |
56974a6f JJ |
1148 | |
1149 | aa_put_label(ctx->label); | |
1150 | ctx->label = aa_get_label(label); | |
1151 | } | |
1152 | aa_put_label(label); | |
1153 | ||
1154 | return 0; | |
1155 | } | |
1156 | ||
56974a6f JJ |
1157 | static int apparmor_socket_bind(struct socket *sock, |
1158 | struct sockaddr *address, int addrlen) | |
1159 | { | |
1160 | AA_BUG(!sock); | |
1161 | AA_BUG(!sock->sk); | |
1162 | AA_BUG(!address); | |
1163 | AA_BUG(in_interrupt()); | |
1164 | ||
1165 | return af_select(sock->sk->sk_family, | |
1166 | bind_perm(sock, address, addrlen), | |
1167 | aa_sk_perm(OP_BIND, AA_MAY_BIND, sock->sk)); | |
1168 | } | |
1169 | ||
56974a6f JJ |
1170 | static int apparmor_socket_connect(struct socket *sock, |
1171 | struct sockaddr *address, int addrlen) | |
1172 | { | |
1173 | AA_BUG(!sock); | |
1174 | AA_BUG(!sock->sk); | |
1175 | AA_BUG(!address); | |
1176 | AA_BUG(in_interrupt()); | |
1177 | ||
1178 | return af_select(sock->sk->sk_family, | |
1179 | connect_perm(sock, address, addrlen), | |
1180 | aa_sk_perm(OP_CONNECT, AA_MAY_CONNECT, sock->sk)); | |
1181 | } | |
1182 | ||
56974a6f JJ |
1183 | static int apparmor_socket_listen(struct socket *sock, int backlog) |
1184 | { | |
1185 | AA_BUG(!sock); | |
1186 | AA_BUG(!sock->sk); | |
1187 | AA_BUG(in_interrupt()); | |
1188 | ||
1189 | return af_select(sock->sk->sk_family, | |
1190 | listen_perm(sock, backlog), | |
1191 | aa_sk_perm(OP_LISTEN, AA_MAY_LISTEN, sock->sk)); | |
1192 | } | |
1193 | ||
1cba2750 | 1194 | /* |
56974a6f JJ |
1195 | * Note: while @newsock is created and has some information, the accept |
1196 | * has not been done. | |
1197 | */ | |
1198 | static int apparmor_socket_accept(struct socket *sock, struct socket *newsock) | |
1199 | { | |
1200 | AA_BUG(!sock); | |
1201 | AA_BUG(!sock->sk); | |
1202 | AA_BUG(!newsock); | |
1203 | AA_BUG(in_interrupt()); | |
1204 | ||
1205 | return af_select(sock->sk->sk_family, | |
1206 | accept_perm(sock, newsock), | |
1207 | aa_sk_perm(OP_ACCEPT, AA_MAY_ACCEPT, sock->sk)); | |
1208 | } | |
1209 | ||
1210 | static int aa_sock_msg_perm(const char *op, u32 request, struct socket *sock, | |
1211 | struct msghdr *msg, int size) | |
1212 | { | |
1213 | AA_BUG(!sock); | |
1214 | AA_BUG(!sock->sk); | |
1215 | AA_BUG(!msg); | |
1216 | AA_BUG(in_interrupt()); | |
1217 | ||
1218 | return af_select(sock->sk->sk_family, | |
1219 | msg_perm(op, request, sock, msg, size), | |
1220 | aa_sk_perm(op, request, sock->sk)); | |
1221 | } | |
1222 | ||
56974a6f JJ |
1223 | static int apparmor_socket_sendmsg(struct socket *sock, |
1224 | struct msghdr *msg, int size) | |
1225 | { | |
1226 | return aa_sock_msg_perm(OP_SENDMSG, AA_MAY_SEND, sock, msg, size); | |
1227 | } | |
1228 | ||
56974a6f JJ |
1229 | static int apparmor_socket_recvmsg(struct socket *sock, |
1230 | struct msghdr *msg, int size, int flags) | |
1231 | { | |
1232 | return aa_sock_msg_perm(OP_RECVMSG, AA_MAY_RECEIVE, sock, msg, size); | |
1233 | } | |
1234 | ||
1235 | /* revaliation, get/set attr, shutdown */ | |
1236 | static int aa_sock_perm(const char *op, u32 request, struct socket *sock) | |
1237 | { | |
1238 | AA_BUG(!sock); | |
1239 | AA_BUG(!sock->sk); | |
1240 | AA_BUG(in_interrupt()); | |
1241 | ||
1242 | return af_select(sock->sk->sk_family, | |
1243 | sock_perm(op, request, sock), | |
1244 | aa_sk_perm(op, request, sock->sk)); | |
1245 | } | |
1246 | ||
56974a6f JJ |
1247 | static int apparmor_socket_getsockname(struct socket *sock) |
1248 | { | |
1249 | return aa_sock_perm(OP_GETSOCKNAME, AA_MAY_GETATTR, sock); | |
1250 | } | |
1251 | ||
56974a6f JJ |
1252 | static int apparmor_socket_getpeername(struct socket *sock) |
1253 | { | |
1254 | return aa_sock_perm(OP_GETPEERNAME, AA_MAY_GETATTR, sock); | |
1255 | } | |
1256 | ||
1257 | /* revaliation, get/set attr, opt */ | |
1258 | static int aa_sock_opt_perm(const char *op, u32 request, struct socket *sock, | |
1259 | int level, int optname) | |
1260 | { | |
1261 | AA_BUG(!sock); | |
1262 | AA_BUG(!sock->sk); | |
1263 | AA_BUG(in_interrupt()); | |
1264 | ||
1265 | return af_select(sock->sk->sk_family, | |
1266 | opt_perm(op, request, sock, level, optname), | |
1267 | aa_sk_perm(op, request, sock->sk)); | |
1268 | } | |
1269 | ||
56974a6f JJ |
1270 | static int apparmor_socket_getsockopt(struct socket *sock, int level, |
1271 | int optname) | |
1272 | { | |
1273 | return aa_sock_opt_perm(OP_GETSOCKOPT, AA_MAY_GETOPT, sock, | |
1274 | level, optname); | |
1275 | } | |
1276 | ||
56974a6f JJ |
1277 | static int apparmor_socket_setsockopt(struct socket *sock, int level, |
1278 | int optname) | |
1279 | { | |
1280 | return aa_sock_opt_perm(OP_SETSOCKOPT, AA_MAY_SETOPT, sock, | |
1281 | level, optname); | |
1282 | } | |
1283 | ||
56974a6f JJ |
1284 | static int apparmor_socket_shutdown(struct socket *sock, int how) |
1285 | { | |
1286 | return aa_sock_perm(OP_SHUTDOWN, AA_MAY_SHUTDOWN, sock); | |
1287 | } | |
1288 | ||
e1af4779 | 1289 | #ifdef CONFIG_NETWORK_SECMARK |
56974a6f | 1290 | /** |
0fc6ab40 | 1291 | * apparmor_socket_sock_rcv_skb - check perms before associating skb to sk |
1cba2750 JJ |
1292 | * @sk: sk to associate @skb with |
1293 | * @skb: skb to check for perms | |
56974a6f JJ |
1294 | * |
1295 | * Note: can not sleep may be called with locks held | |
1296 | * | |
1297 | * dont want protocol specific in __skb_recv_datagram() | |
1298 | * to deny an incoming connection socket_sock_rcv_skb() | |
1299 | */ | |
1300 | static int apparmor_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
1301 | { | |
79ddd4a7 | 1302 | struct aa_sk_ctx *ctx = aa_sock(sk); |
ab9f2115 MG |
1303 | |
1304 | if (!skb->secmark) | |
1305 | return 0; | |
1306 | ||
1307 | return apparmor_secmark_check(ctx->label, OP_RECVMSG, AA_MAY_RECEIVE, | |
1308 | skb->secmark, sk); | |
56974a6f | 1309 | } |
e1af4779 | 1310 | #endif |
56974a6f JJ |
1311 | |
1312 | ||
1313 | static struct aa_label *sk_peer_label(struct sock *sk) | |
1314 | { | |
79ddd4a7 | 1315 | struct aa_sk_ctx *ctx = aa_sock(sk); |
56974a6f JJ |
1316 | |
1317 | if (ctx->peer) | |
1318 | return ctx->peer; | |
1319 | ||
1320 | return ERR_PTR(-ENOPROTOOPT); | |
1321 | } | |
1322 | ||
1323 | /** | |
1324 | * apparmor_socket_getpeersec_stream - get security context of peer | |
1cba2750 JJ |
1325 | * @sock: socket that we are trying to get the peer context of |
1326 | * @optval: output - buffer to copy peer name to | |
1327 | * @optlen: output - size of copied name in @optval | |
1328 | * @len: size of @optval buffer | |
1329 | * Returns: 0 on success, -errno of failure | |
56974a6f JJ |
1330 | * |
1331 | * Note: for tcp only valid if using ipsec or cipso on lan | |
1332 | */ | |
1333 | static int apparmor_socket_getpeersec_stream(struct socket *sock, | |
b10b9c34 | 1334 | sockptr_t optval, sockptr_t optlen, |
56974a6f JJ |
1335 | unsigned int len) |
1336 | { | |
b10b9c34 | 1337 | char *name = NULL; |
56974a6f JJ |
1338 | int slen, error = 0; |
1339 | struct aa_label *label; | |
1340 | struct aa_label *peer; | |
1341 | ||
1342 | label = begin_current_label_crit_section(); | |
1343 | peer = sk_peer_label(sock->sk); | |
1344 | if (IS_ERR(peer)) { | |
1345 | error = PTR_ERR(peer); | |
1346 | goto done; | |
1347 | } | |
1348 | slen = aa_label_asxprint(&name, labels_ns(label), peer, | |
1349 | FLAG_SHOW_MODE | FLAG_VIEW_SUBNS | | |
1350 | FLAG_HIDDEN_UNCONFINED, GFP_KERNEL); | |
1351 | /* don't include terminating \0 in slen, it breaks some apps */ | |
1352 | if (slen < 0) { | |
1353 | error = -ENOMEM; | |
b10b9c34 PM |
1354 | goto done; |
1355 | } | |
1356 | if (slen > len) { | |
1357 | error = -ERANGE; | |
1358 | goto done_len; | |
56974a6f JJ |
1359 | } |
1360 | ||
b10b9c34 PM |
1361 | if (copy_to_sockptr(optval, name, slen)) |
1362 | error = -EFAULT; | |
1363 | done_len: | |
1364 | if (copy_to_sockptr(optlen, &slen, sizeof(slen))) | |
1365 | error = -EFAULT; | |
56974a6f JJ |
1366 | done: |
1367 | end_current_label_crit_section(label); | |
b10b9c34 | 1368 | kfree(name); |
56974a6f JJ |
1369 | return error; |
1370 | } | |
1371 | ||
1372 | /** | |
1373 | * apparmor_socket_getpeersec_dgram - get security label of packet | |
1374 | * @sock: the peer socket | |
1375 | * @skb: packet data | |
1376 | * @secid: pointer to where to put the secid of the packet | |
1377 | * | |
1378 | * Sets the netlabel socket state on sk from parent | |
1379 | */ | |
1380 | static int apparmor_socket_getpeersec_dgram(struct socket *sock, | |
1381 | struct sk_buff *skb, u32 *secid) | |
1382 | ||
1383 | { | |
1384 | /* TODO: requires secid support */ | |
1385 | return -ENOPROTOOPT; | |
1386 | } | |
1387 | ||
1388 | /** | |
1389 | * apparmor_sock_graft - Initialize newly created socket | |
1390 | * @sk: child sock | |
1391 | * @parent: parent socket | |
1392 | * | |
1393 | * Note: could set off of SOCK_CTX(parent) but need to track inode and we can | |
1394 | * just set sk security information off of current creating process label | |
1395 | * Labeling of sk for accept case - probably should be sock based | |
1396 | * instead of task, because of the case where an implicitly labeled | |
1397 | * socket is shared by different tasks. | |
1398 | */ | |
1399 | static void apparmor_sock_graft(struct sock *sk, struct socket *parent) | |
1400 | { | |
79ddd4a7 | 1401 | struct aa_sk_ctx *ctx = aa_sock(sk); |
56974a6f JJ |
1402 | |
1403 | if (!ctx->label) | |
1404 | ctx->label = aa_get_current_label(); | |
1405 | } | |
1406 | ||
e1af4779 | 1407 | #ifdef CONFIG_NETWORK_SECMARK |
41dd9596 | 1408 | static int apparmor_inet_conn_request(const struct sock *sk, struct sk_buff *skb, |
ab9f2115 MG |
1409 | struct request_sock *req) |
1410 | { | |
79ddd4a7 | 1411 | struct aa_sk_ctx *ctx = aa_sock(sk); |
ab9f2115 MG |
1412 | |
1413 | if (!skb->secmark) | |
1414 | return 0; | |
1415 | ||
1416 | return apparmor_secmark_check(ctx->label, OP_CONNECT, AA_MAY_CONNECT, | |
1417 | skb->secmark, sk); | |
1418 | } | |
e1af4779 | 1419 | #endif |
ab9f2115 | 1420 | |
bbd3662a | 1421 | /* |
37923d43 | 1422 | * The cred blob is a pointer to, not an instance of, an aa_label. |
bbd3662a | 1423 | */ |
f22f9aaf | 1424 | struct lsm_blob_sizes apparmor_blob_sizes __ro_after_init = { |
37923d43 | 1425 | .lbs_cred = sizeof(struct aa_label *), |
33bf60ca | 1426 | .lbs_file = sizeof(struct aa_file_ctx), |
f4ad8f2c | 1427 | .lbs_task = sizeof(struct aa_task_ctx), |
bbd3662a CS |
1428 | }; |
1429 | ||
b1a867ee | 1430 | static const struct lsm_id apparmor_lsmid = { |
f3b8788c CS |
1431 | .name = "apparmor", |
1432 | .id = LSM_ID_APPARMOR, | |
1433 | }; | |
1434 | ||
f22f9aaf | 1435 | static struct security_hook_list apparmor_hooks[] __ro_after_init = { |
e20b043a CS |
1436 | LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check), |
1437 | LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme), | |
1438 | LSM_HOOK_INIT(capget, apparmor_capget), | |
1439 | LSM_HOOK_INIT(capable, apparmor_capable), | |
1440 | ||
157a3537 | 1441 | LSM_HOOK_INIT(move_mount, apparmor_move_mount), |
2ea3ffb7 JJ |
1442 | LSM_HOOK_INIT(sb_mount, apparmor_sb_mount), |
1443 | LSM_HOOK_INIT(sb_umount, apparmor_sb_umount), | |
1444 | LSM_HOOK_INIT(sb_pivotroot, apparmor_sb_pivotroot), | |
1445 | ||
e20b043a CS |
1446 | LSM_HOOK_INIT(path_link, apparmor_path_link), |
1447 | LSM_HOOK_INIT(path_unlink, apparmor_path_unlink), | |
1448 | LSM_HOOK_INIT(path_symlink, apparmor_path_symlink), | |
1449 | LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir), | |
1450 | LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir), | |
1451 | LSM_HOOK_INIT(path_mknod, apparmor_path_mknod), | |
1452 | LSM_HOOK_INIT(path_rename, apparmor_path_rename), | |
1453 | LSM_HOOK_INIT(path_chmod, apparmor_path_chmod), | |
1454 | LSM_HOOK_INIT(path_chown, apparmor_path_chown), | |
1455 | LSM_HOOK_INIT(path_truncate, apparmor_path_truncate), | |
1456 | LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr), | |
1457 | ||
1458 | LSM_HOOK_INIT(file_open, apparmor_file_open), | |
064dc947 | 1459 | LSM_HOOK_INIT(file_receive, apparmor_file_receive), |
e20b043a CS |
1460 | LSM_HOOK_INIT(file_permission, apparmor_file_permission), |
1461 | LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security), | |
1462 | LSM_HOOK_INIT(file_free_security, apparmor_file_free_security), | |
1463 | LSM_HOOK_INIT(mmap_file, apparmor_mmap_file), | |
e20b043a CS |
1464 | LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect), |
1465 | LSM_HOOK_INIT(file_lock, apparmor_file_lock), | |
3350607d | 1466 | LSM_HOOK_INIT(file_truncate, apparmor_file_truncate), |
e20b043a | 1467 | |
223981db CS |
1468 | LSM_HOOK_INIT(getselfattr, apparmor_getselfattr), |
1469 | LSM_HOOK_INIT(setselfattr, apparmor_setselfattr), | |
e20b043a CS |
1470 | LSM_HOOK_INIT(getprocattr, apparmor_getprocattr), |
1471 | LSM_HOOK_INIT(setprocattr, apparmor_setprocattr), | |
1472 | ||
56974a6f JJ |
1473 | LSM_HOOK_INIT(sk_alloc_security, apparmor_sk_alloc_security), |
1474 | LSM_HOOK_INIT(sk_free_security, apparmor_sk_free_security), | |
1475 | LSM_HOOK_INIT(sk_clone_security, apparmor_sk_clone_security), | |
1476 | ||
1477 | LSM_HOOK_INIT(socket_create, apparmor_socket_create), | |
1478 | LSM_HOOK_INIT(socket_post_create, apparmor_socket_post_create), | |
1479 | LSM_HOOK_INIT(socket_bind, apparmor_socket_bind), | |
1480 | LSM_HOOK_INIT(socket_connect, apparmor_socket_connect), | |
1481 | LSM_HOOK_INIT(socket_listen, apparmor_socket_listen), | |
1482 | LSM_HOOK_INIT(socket_accept, apparmor_socket_accept), | |
1483 | LSM_HOOK_INIT(socket_sendmsg, apparmor_socket_sendmsg), | |
1484 | LSM_HOOK_INIT(socket_recvmsg, apparmor_socket_recvmsg), | |
1485 | LSM_HOOK_INIT(socket_getsockname, apparmor_socket_getsockname), | |
1486 | LSM_HOOK_INIT(socket_getpeername, apparmor_socket_getpeername), | |
1487 | LSM_HOOK_INIT(socket_getsockopt, apparmor_socket_getsockopt), | |
1488 | LSM_HOOK_INIT(socket_setsockopt, apparmor_socket_setsockopt), | |
1489 | LSM_HOOK_INIT(socket_shutdown, apparmor_socket_shutdown), | |
e1af4779 | 1490 | #ifdef CONFIG_NETWORK_SECMARK |
56974a6f | 1491 | LSM_HOOK_INIT(socket_sock_rcv_skb, apparmor_socket_sock_rcv_skb), |
e1af4779 | 1492 | #endif |
56974a6f JJ |
1493 | LSM_HOOK_INIT(socket_getpeersec_stream, |
1494 | apparmor_socket_getpeersec_stream), | |
1495 | LSM_HOOK_INIT(socket_getpeersec_dgram, | |
1496 | apparmor_socket_getpeersec_dgram), | |
1497 | LSM_HOOK_INIT(sock_graft, apparmor_sock_graft), | |
e1af4779 | 1498 | #ifdef CONFIG_NETWORK_SECMARK |
ab9f2115 | 1499 | LSM_HOOK_INIT(inet_conn_request, apparmor_inet_conn_request), |
e1af4779 | 1500 | #endif |
56974a6f | 1501 | |
e20b043a CS |
1502 | LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank), |
1503 | LSM_HOOK_INIT(cred_free, apparmor_cred_free), | |
1504 | LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare), | |
1505 | LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer), | |
1506 | ||
b8bff599 | 1507 | LSM_HOOK_INIT(bprm_creds_for_exec, apparmor_bprm_creds_for_exec), |
e20b043a CS |
1508 | LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds), |
1509 | LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds), | |
e20b043a | 1510 | |
3b529a76 JJ |
1511 | LSM_HOOK_INIT(task_free, apparmor_task_free), |
1512 | LSM_HOOK_INIT(task_alloc, apparmor_task_alloc), | |
6326948f PM |
1513 | LSM_HOOK_INIT(current_getsecid_subj, apparmor_current_getsecid_subj), |
1514 | LSM_HOOK_INIT(task_getsecid_obj, apparmor_task_getsecid_obj), | |
e20b043a | 1515 | LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit), |
cd1dbf76 | 1516 | LSM_HOOK_INIT(task_kill, apparmor_task_kill), |
fa9b63ad | 1517 | LSM_HOOK_INIT(userns_create, apparmor_userns_create), |
c0929212 | 1518 | |
e79c26d0 MG |
1519 | #ifdef CONFIG_AUDIT |
1520 | LSM_HOOK_INIT(audit_rule_init, aa_audit_rule_init), | |
1521 | LSM_HOOK_INIT(audit_rule_known, aa_audit_rule_known), | |
1522 | LSM_HOOK_INIT(audit_rule_match, aa_audit_rule_match), | |
1523 | LSM_HOOK_INIT(audit_rule_free, aa_audit_rule_free), | |
1524 | #endif | |
1525 | ||
c0929212 JJ |
1526 | LSM_HOOK_INIT(secid_to_secctx, apparmor_secid_to_secctx), |
1527 | LSM_HOOK_INIT(secctx_to_secid, apparmor_secctx_to_secid), | |
1528 | LSM_HOOK_INIT(release_secctx, apparmor_release_secctx), | |
c4371d90 GG |
1529 | |
1530 | #ifdef CONFIG_IO_URING | |
1531 | LSM_HOOK_INIT(uring_override_creds, apparmor_uring_override_creds), | |
1532 | LSM_HOOK_INIT(uring_sqpoll, apparmor_uring_sqpoll), | |
1533 | #endif | |
b5e95b48 JJ |
1534 | }; |
1535 | ||
1536 | /* | |
1537 | * AppArmor sysfs module parameters | |
1538 | */ | |
1539 | ||
101d6c82 SR |
1540 | static int param_set_aabool(const char *val, const struct kernel_param *kp); |
1541 | static int param_get_aabool(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 1542 | #define param_check_aabool param_check_bool |
9c27847d | 1543 | static const struct kernel_param_ops param_ops_aabool = { |
6a4c2643 | 1544 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
1545 | .set = param_set_aabool, |
1546 | .get = param_get_aabool | |
1547 | }; | |
b5e95b48 | 1548 | |
101d6c82 SR |
1549 | static int param_set_aauint(const char *val, const struct kernel_param *kp); |
1550 | static int param_get_aauint(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 1551 | #define param_check_aauint param_check_uint |
9c27847d | 1552 | static const struct kernel_param_ops param_ops_aauint = { |
101d6c82 SR |
1553 | .set = param_set_aauint, |
1554 | .get = param_get_aauint | |
1555 | }; | |
b5e95b48 | 1556 | |
63c16c3a CC |
1557 | static int param_set_aacompressionlevel(const char *val, |
1558 | const struct kernel_param *kp); | |
1559 | static int param_get_aacompressionlevel(char *buffer, | |
1560 | const struct kernel_param *kp); | |
1561 | #define param_check_aacompressionlevel param_check_int | |
1562 | static const struct kernel_param_ops param_ops_aacompressionlevel = { | |
1563 | .set = param_set_aacompressionlevel, | |
1564 | .get = param_get_aacompressionlevel | |
1565 | }; | |
1566 | ||
101d6c82 SR |
1567 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp); |
1568 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 1569 | #define param_check_aalockpolicy param_check_bool |
9c27847d | 1570 | static const struct kernel_param_ops param_ops_aalockpolicy = { |
6a4c2643 | 1571 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
1572 | .set = param_set_aalockpolicy, |
1573 | .get = param_get_aalockpolicy | |
1574 | }; | |
b5e95b48 | 1575 | |
e4dca7b7 KC |
1576 | static int param_set_audit(const char *val, const struct kernel_param *kp); |
1577 | static int param_get_audit(char *buffer, const struct kernel_param *kp); | |
b5e95b48 | 1578 | |
e4dca7b7 KC |
1579 | static int param_set_mode(const char *val, const struct kernel_param *kp); |
1580 | static int param_get_mode(char *buffer, const struct kernel_param *kp); | |
b5e95b48 JJ |
1581 | |
1582 | /* Flag values, also controllable via /sys/module/apparmor/parameters | |
1583 | * We define special types as we want to do additional mediation. | |
1584 | */ | |
1585 | ||
1586 | /* AppArmor global enforcement switch - complain, enforce, kill */ | |
1587 | enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE; | |
1588 | module_param_call(mode, param_set_mode, param_get_mode, | |
1589 | &aa_g_profile_mode, S_IRUSR | S_IWUSR); | |
1590 | ||
6059f71f | 1591 | /* whether policy verification hashing is enabled */ |
7616ac70 | 1592 | bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT); |
3ccb76c5 | 1593 | #ifdef CONFIG_SECURITY_APPARMOR_HASH |
6059f71f | 1594 | module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR); |
7616ac70 | 1595 | #endif |
6059f71f | 1596 | |
d61c57fd JJ |
1597 | /* whether policy exactly as loaded is retained for debug and checkpointing */ |
1598 | bool aa_g_export_binary = IS_ENABLED(CONFIG_SECURITY_APPARMOR_EXPORT_BINARY); | |
1599 | #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY | |
1600 | module_param_named(export_binary, aa_g_export_binary, aabool, 0600); | |
1601 | #endif | |
1602 | ||
63c16c3a | 1603 | /* policy loaddata compression level */ |
70f24a9f | 1604 | int aa_g_rawdata_compression_level = AA_DEFAULT_CLEVEL; |
63c16c3a CC |
1605 | module_param_named(rawdata_compression_level, aa_g_rawdata_compression_level, |
1606 | aacompressionlevel, 0400); | |
1607 | ||
b5e95b48 | 1608 | /* Debug mode */ |
eea7a05f | 1609 | bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_APPARMOR_DEBUG_MESSAGES); |
b5e95b48 JJ |
1610 | module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR); |
1611 | ||
1612 | /* Audit mode */ | |
1613 | enum audit_mode aa_g_audit; | |
1614 | module_param_call(audit, param_set_audit, param_get_audit, | |
1615 | &aa_g_audit, S_IRUSR | S_IWUSR); | |
1616 | ||
1617 | /* Determines if audit header is included in audited messages. This | |
1618 | * provides more context if the audit daemon is not running | |
1619 | */ | |
954317fe | 1620 | bool aa_g_audit_header = true; |
b5e95b48 JJ |
1621 | module_param_named(audit_header, aa_g_audit_header, aabool, |
1622 | S_IRUSR | S_IWUSR); | |
1623 | ||
1624 | /* lock out loading/removal of policy | |
1625 | * TODO: add in at boot loading of policy, which is the only way to | |
1626 | * load policy, if lock_policy is set | |
1627 | */ | |
90ab5ee9 | 1628 | bool aa_g_lock_policy; |
b5e95b48 JJ |
1629 | module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy, |
1630 | S_IRUSR | S_IWUSR); | |
1631 | ||
1632 | /* Syscall logging mode */ | |
90ab5ee9 | 1633 | bool aa_g_logsyscall; |
b5e95b48 JJ |
1634 | module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR); |
1635 | ||
1636 | /* Maximum pathname length before accesses will start getting rejected */ | |
1637 | unsigned int aa_g_path_max = 2 * PATH_MAX; | |
622f6e32 | 1638 | module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR); |
b5e95b48 JJ |
1639 | |
1640 | /* Determines how paranoid loading of policy is and how much verification | |
1641 | * on the loaded policy is done. | |
abbf8734 JJ |
1642 | * DEPRECATED: read only as strict checking of load is always done now |
1643 | * that none root users (user namespaces) can load policy. | |
b5e95b48 | 1644 | */ |
79eb2711 | 1645 | bool aa_g_paranoid_load = IS_ENABLED(CONFIG_SECURITY_APPARMOR_PARANOID_LOAD); |
abbf8734 | 1646 | module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO); |
b5e95b48 | 1647 | |
e33c1b99 KC |
1648 | static int param_get_aaintbool(char *buffer, const struct kernel_param *kp); |
1649 | static int param_set_aaintbool(const char *val, const struct kernel_param *kp); | |
1650 | #define param_check_aaintbool param_check_int | |
1651 | static const struct kernel_param_ops param_ops_aaintbool = { | |
1652 | .set = param_set_aaintbool, | |
1653 | .get = param_get_aaintbool | |
1654 | }; | |
b5e95b48 | 1655 | /* Boot time disable flag */ |
f22f9aaf | 1656 | static int apparmor_enabled __ro_after_init = 1; |
e33c1b99 | 1657 | module_param_named(enabled, apparmor_enabled, aaintbool, 0444); |
b5e95b48 JJ |
1658 | |
1659 | static int __init apparmor_enabled_setup(char *str) | |
1660 | { | |
1661 | unsigned long enabled; | |
29707b20 | 1662 | int error = kstrtoul(str, 0, &enabled); |
b5e95b48 JJ |
1663 | if (!error) |
1664 | apparmor_enabled = enabled ? 1 : 0; | |
1665 | return 1; | |
1666 | } | |
1667 | ||
1668 | __setup("apparmor=", apparmor_enabled_setup); | |
1669 | ||
1670 | /* set global flag turning off the ability to load policy */ | |
101d6c82 | 1671 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp) |
b5e95b48 | 1672 | { |
545de8fe JJ |
1673 | if (!apparmor_enabled) |
1674 | return -EINVAL; | |
92de220a | 1675 | if (apparmor_initialized && !aa_current_policy_admin_capable(NULL)) |
b5e95b48 | 1676 | return -EPERM; |
b5e95b48 JJ |
1677 | return param_set_bool(val, kp); |
1678 | } | |
1679 | ||
101d6c82 | 1680 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1681 | { |
ca4bd5ae JJ |
1682 | if (!apparmor_enabled) |
1683 | return -EINVAL; | |
92de220a | 1684 | if (apparmor_initialized && !aa_current_policy_view_capable(NULL)) |
545de8fe | 1685 | return -EPERM; |
b5e95b48 JJ |
1686 | return param_get_bool(buffer, kp); |
1687 | } | |
1688 | ||
101d6c82 | 1689 | static int param_set_aabool(const char *val, const struct kernel_param *kp) |
b5e95b48 | 1690 | { |
ca4bd5ae JJ |
1691 | if (!apparmor_enabled) |
1692 | return -EINVAL; | |
92de220a | 1693 | if (apparmor_initialized && !aa_current_policy_admin_capable(NULL)) |
545de8fe | 1694 | return -EPERM; |
b5e95b48 JJ |
1695 | return param_set_bool(val, kp); |
1696 | } | |
1697 | ||
101d6c82 | 1698 | static int param_get_aabool(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1699 | { |
ca4bd5ae JJ |
1700 | if (!apparmor_enabled) |
1701 | return -EINVAL; | |
92de220a | 1702 | if (apparmor_initialized && !aa_current_policy_view_capable(NULL)) |
545de8fe | 1703 | return -EPERM; |
b5e95b48 JJ |
1704 | return param_get_bool(buffer, kp); |
1705 | } | |
1706 | ||
101d6c82 | 1707 | static int param_set_aauint(const char *val, const struct kernel_param *kp) |
b5e95b48 | 1708 | { |
39d84824 JJ |
1709 | int error; |
1710 | ||
ca4bd5ae JJ |
1711 | if (!apparmor_enabled) |
1712 | return -EINVAL; | |
39d84824 JJ |
1713 | /* file is ro but enforce 2nd line check */ |
1714 | if (apparmor_initialized) | |
545de8fe | 1715 | return -EPERM; |
39d84824 JJ |
1716 | |
1717 | error = param_set_uint(val, kp); | |
df323337 | 1718 | aa_g_path_max = max_t(uint32_t, aa_g_path_max, sizeof(union aa_buffer)); |
39d84824 JJ |
1719 | pr_info("AppArmor: buffer size set to %d bytes\n", aa_g_path_max); |
1720 | ||
1721 | return error; | |
b5e95b48 JJ |
1722 | } |
1723 | ||
101d6c82 | 1724 | static int param_get_aauint(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1725 | { |
ca4bd5ae JJ |
1726 | if (!apparmor_enabled) |
1727 | return -EINVAL; | |
92de220a | 1728 | if (apparmor_initialized && !aa_current_policy_view_capable(NULL)) |
545de8fe | 1729 | return -EPERM; |
b5e95b48 JJ |
1730 | return param_get_uint(buffer, kp); |
1731 | } | |
1732 | ||
e33c1b99 KC |
1733 | /* Can only be set before AppArmor is initialized (i.e. on boot cmdline). */ |
1734 | static int param_set_aaintbool(const char *val, const struct kernel_param *kp) | |
1735 | { | |
1736 | struct kernel_param kp_local; | |
1737 | bool value; | |
1738 | int error; | |
1739 | ||
1740 | if (apparmor_initialized) | |
1741 | return -EPERM; | |
1742 | ||
1743 | /* Create local copy, with arg pointing to bool type. */ | |
1744 | value = !!*((int *)kp->arg); | |
1745 | memcpy(&kp_local, kp, sizeof(kp_local)); | |
1746 | kp_local.arg = &value; | |
1747 | ||
1748 | error = param_set_bool(val, &kp_local); | |
1749 | if (!error) | |
1750 | *((int *)kp->arg) = *((bool *)kp_local.arg); | |
1751 | return error; | |
1752 | } | |
1753 | ||
1754 | /* | |
1755 | * To avoid changing /sys/module/apparmor/parameters/enabled from Y/N to | |
1756 | * 1/0, this converts the "int that is actually bool" back to bool for | |
1757 | * display in the /sys filesystem, while keeping it "int" for the LSM | |
1758 | * infrastructure. | |
1759 | */ | |
1760 | static int param_get_aaintbool(char *buffer, const struct kernel_param *kp) | |
1761 | { | |
1762 | struct kernel_param kp_local; | |
1763 | bool value; | |
1764 | ||
1765 | /* Create local copy, with arg pointing to bool type. */ | |
1766 | value = !!*((int *)kp->arg); | |
1767 | memcpy(&kp_local, kp, sizeof(kp_local)); | |
1768 | kp_local.arg = &value; | |
1769 | ||
1770 | return param_get_bool(buffer, &kp_local); | |
1771 | } | |
1772 | ||
63c16c3a CC |
1773 | static int param_set_aacompressionlevel(const char *val, |
1774 | const struct kernel_param *kp) | |
1775 | { | |
1776 | int error; | |
1777 | ||
1778 | if (!apparmor_enabled) | |
1779 | return -EINVAL; | |
1780 | if (apparmor_initialized) | |
1781 | return -EPERM; | |
1782 | ||
1783 | error = param_set_int(val, kp); | |
1784 | ||
1785 | aa_g_rawdata_compression_level = clamp(aa_g_rawdata_compression_level, | |
70f24a9f | 1786 | AA_MIN_CLEVEL, AA_MAX_CLEVEL); |
f4d6b94b | 1787 | pr_info("AppArmor: policy rawdata compression level set to %d\n", |
63c16c3a CC |
1788 | aa_g_rawdata_compression_level); |
1789 | ||
1790 | return error; | |
1791 | } | |
1792 | ||
1793 | static int param_get_aacompressionlevel(char *buffer, | |
1794 | const struct kernel_param *kp) | |
1795 | { | |
1796 | if (!apparmor_enabled) | |
1797 | return -EINVAL; | |
92de220a | 1798 | if (apparmor_initialized && !aa_current_policy_view_capable(NULL)) |
63c16c3a CC |
1799 | return -EPERM; |
1800 | return param_get_int(buffer, kp); | |
1801 | } | |
1802 | ||
e4dca7b7 | 1803 | static int param_get_audit(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1804 | { |
b5e95b48 JJ |
1805 | if (!apparmor_enabled) |
1806 | return -EINVAL; | |
92de220a | 1807 | if (apparmor_initialized && !aa_current_policy_view_capable(NULL)) |
545de8fe | 1808 | return -EPERM; |
b5e95b48 JJ |
1809 | return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]); |
1810 | } | |
1811 | ||
e4dca7b7 | 1812 | static int param_set_audit(const char *val, const struct kernel_param *kp) |
b5e95b48 JJ |
1813 | { |
1814 | int i; | |
b5e95b48 JJ |
1815 | |
1816 | if (!apparmor_enabled) | |
1817 | return -EINVAL; | |
b5e95b48 JJ |
1818 | if (!val) |
1819 | return -EINVAL; | |
92de220a | 1820 | if (apparmor_initialized && !aa_current_policy_admin_capable(NULL)) |
545de8fe | 1821 | return -EPERM; |
b5e95b48 | 1822 | |
5d8779a5 AS |
1823 | i = match_string(audit_mode_names, AUDIT_MAX_INDEX, val); |
1824 | if (i < 0) | |
1825 | return -EINVAL; | |
b5e95b48 | 1826 | |
5d8779a5 AS |
1827 | aa_g_audit = i; |
1828 | return 0; | |
b5e95b48 JJ |
1829 | } |
1830 | ||
e4dca7b7 | 1831 | static int param_get_mode(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1832 | { |
b5e95b48 JJ |
1833 | if (!apparmor_enabled) |
1834 | return -EINVAL; | |
92de220a | 1835 | if (apparmor_initialized && !aa_current_policy_view_capable(NULL)) |
545de8fe | 1836 | return -EPERM; |
b5e95b48 | 1837 | |
0d259f04 | 1838 | return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]); |
b5e95b48 JJ |
1839 | } |
1840 | ||
e4dca7b7 | 1841 | static int param_set_mode(const char *val, const struct kernel_param *kp) |
b5e95b48 JJ |
1842 | { |
1843 | int i; | |
b5e95b48 JJ |
1844 | |
1845 | if (!apparmor_enabled) | |
1846 | return -EINVAL; | |
b5e95b48 JJ |
1847 | if (!val) |
1848 | return -EINVAL; | |
92de220a | 1849 | if (apparmor_initialized && !aa_current_policy_admin_capable(NULL)) |
545de8fe | 1850 | return -EPERM; |
b5e95b48 | 1851 | |
5d8779a5 AS |
1852 | i = match_string(aa_profile_mode_names, APPARMOR_MODE_NAMES_MAX_INDEX, |
1853 | val); | |
1854 | if (i < 0) | |
1855 | return -EINVAL; | |
b5e95b48 | 1856 | |
5d8779a5 AS |
1857 | aa_g_profile_mode = i; |
1858 | return 0; | |
b5e95b48 JJ |
1859 | } |
1860 | ||
341c1fda | 1861 | char *aa_get_buffer(bool in_atomic) |
df323337 SAS |
1862 | { |
1863 | union aa_buffer *aa_buf; | |
ea9bae12 | 1864 | struct aa_local_cache *cache; |
df323337 | 1865 | bool try_again = true; |
341c1fda | 1866 | gfp_t flags = (GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN); |
df323337 | 1867 | |
ea9bae12 JJ |
1868 | /* use per cpu cached buffers first */ |
1869 | cache = get_cpu_ptr(&aa_local_buffers); | |
1870 | if (!list_empty(&cache->head)) { | |
1871 | aa_buf = list_first_entry(&cache->head, union aa_buffer, list); | |
1872 | list_del(&aa_buf->list); | |
1873 | cache->hold--; | |
1874 | cache->count--; | |
1875 | put_cpu_ptr(&aa_local_buffers); | |
1876 | return &aa_buf->buffer[0]; | |
1877 | } | |
1878 | put_cpu_ptr(&aa_local_buffers); | |
1879 | ||
1880 | if (!spin_trylock(&aa_buffers_lock)) { | |
1881 | cache = get_cpu_ptr(&aa_local_buffers); | |
1882 | cache->hold += 1; | |
1883 | put_cpu_ptr(&aa_local_buffers); | |
1884 | spin_lock(&aa_buffers_lock); | |
1885 | } else { | |
1886 | cache = get_cpu_ptr(&aa_local_buffers); | |
1887 | put_cpu_ptr(&aa_local_buffers); | |
1888 | } | |
df323337 | 1889 | retry: |
341c1fda JJ |
1890 | if (buffer_count > reserve_count || |
1891 | (in_atomic && !list_empty(&aa_global_buffers))) { | |
df323337 SAS |
1892 | aa_buf = list_first_entry(&aa_global_buffers, union aa_buffer, |
1893 | list); | |
1894 | list_del(&aa_buf->list); | |
341c1fda | 1895 | buffer_count--; |
df323337 | 1896 | spin_unlock(&aa_buffers_lock); |
ba808cb5 | 1897 | return aa_buf->buffer; |
df323337 | 1898 | } |
341c1fda JJ |
1899 | if (in_atomic) { |
1900 | /* | |
1901 | * out of reserve buffers and in atomic context so increase | |
1902 | * how many buffers to keep in reserve | |
1903 | */ | |
1904 | reserve_count++; | |
1905 | flags = GFP_ATOMIC; | |
1906 | } | |
df323337 SAS |
1907 | spin_unlock(&aa_buffers_lock); |
1908 | ||
341c1fda JJ |
1909 | if (!in_atomic) |
1910 | might_sleep(); | |
1911 | aa_buf = kmalloc(aa_g_path_max, flags); | |
df323337 SAS |
1912 | if (!aa_buf) { |
1913 | if (try_again) { | |
1914 | try_again = false; | |
ea9bae12 | 1915 | spin_lock(&aa_buffers_lock); |
df323337 SAS |
1916 | goto retry; |
1917 | } | |
1918 | pr_warn_once("AppArmor: Failed to allocate a memory buffer.\n"); | |
1919 | return NULL; | |
1920 | } | |
ba808cb5 | 1921 | return aa_buf->buffer; |
df323337 SAS |
1922 | } |
1923 | ||
1924 | void aa_put_buffer(char *buf) | |
1925 | { | |
1926 | union aa_buffer *aa_buf; | |
ea9bae12 | 1927 | struct aa_local_cache *cache; |
df323337 SAS |
1928 | |
1929 | if (!buf) | |
1930 | return; | |
1931 | aa_buf = container_of(buf, union aa_buffer, buffer[0]); | |
1932 | ||
ea9bae12 JJ |
1933 | cache = get_cpu_ptr(&aa_local_buffers); |
1934 | if (!cache->hold) { | |
1935 | put_cpu_ptr(&aa_local_buffers); | |
1936 | ||
1937 | if (spin_trylock(&aa_buffers_lock)) { | |
1938 | /* put back on global list */ | |
1939 | list_add(&aa_buf->list, &aa_global_buffers); | |
1940 | buffer_count++; | |
1941 | spin_unlock(&aa_buffers_lock); | |
1942 | cache = get_cpu_ptr(&aa_local_buffers); | |
1943 | put_cpu_ptr(&aa_local_buffers); | |
1944 | return; | |
1945 | } | |
1946 | /* contention on global list, fallback to percpu */ | |
1947 | cache = get_cpu_ptr(&aa_local_buffers); | |
1948 | cache->hold += 1; | |
1949 | } | |
1950 | ||
1951 | /* cache in percpu list */ | |
1952 | list_add(&aa_buf->list, &cache->head); | |
1953 | cache->count++; | |
1954 | put_cpu_ptr(&aa_local_buffers); | |
df323337 SAS |
1955 | } |
1956 | ||
b5e95b48 JJ |
1957 | /* |
1958 | * AppArmor init functions | |
1959 | */ | |
1960 | ||
1961 | /** | |
55a26ebf | 1962 | * set_init_ctx - set a task context and profile on the first task. |
b5e95b48 JJ |
1963 | * |
1964 | * TODO: allow setting an alternate profile than unconfined | |
1965 | */ | |
55a26ebf | 1966 | static int __init set_init_ctx(void) |
b5e95b48 | 1967 | { |
bf1d2ee7 | 1968 | struct cred *cred = (__force struct cred *)current->real_cred; |
b5e95b48 | 1969 | |
69b5a44a | 1970 | set_cred_label(cred, aa_get_label(ns_unconfined(root_ns))); |
b5e95b48 JJ |
1971 | |
1972 | return 0; | |
1973 | } | |
1974 | ||
d4669f0b JJ |
1975 | static void destroy_buffers(void) |
1976 | { | |
df323337 | 1977 | union aa_buffer *aa_buf; |
d4669f0b | 1978 | |
df323337 SAS |
1979 | spin_lock(&aa_buffers_lock); |
1980 | while (!list_empty(&aa_global_buffers)) { | |
1981 | aa_buf = list_first_entry(&aa_global_buffers, union aa_buffer, | |
1982 | list); | |
1983 | list_del(&aa_buf->list); | |
1984 | spin_unlock(&aa_buffers_lock); | |
1985 | kfree(aa_buf); | |
1986 | spin_lock(&aa_buffers_lock); | |
d4669f0b | 1987 | } |
df323337 | 1988 | spin_unlock(&aa_buffers_lock); |
d4669f0b JJ |
1989 | } |
1990 | ||
1991 | static int __init alloc_buffers(void) | |
1992 | { | |
df323337 SAS |
1993 | union aa_buffer *aa_buf; |
1994 | int i, num; | |
1995 | ||
ea9bae12 JJ |
1996 | /* |
1997 | * per cpu set of cached allocated buffers used to help reduce | |
1998 | * lock contention | |
1999 | */ | |
2000 | for_each_possible_cpu(i) { | |
2001 | per_cpu(aa_local_buffers, i).hold = 0; | |
2002 | per_cpu(aa_local_buffers, i).count = 0; | |
2003 | INIT_LIST_HEAD(&per_cpu(aa_local_buffers, i).head); | |
2004 | } | |
df323337 SAS |
2005 | /* |
2006 | * A function may require two buffers at once. Usually the buffers are | |
2007 | * used for a short period of time and are shared. On UP kernel buffers | |
2008 | * two should be enough, with more CPUs it is possible that more | |
2009 | * buffers will be used simultaneously. The preallocated pool may grow. | |
2010 | * This preallocation has also the side-effect that AppArmor will be | |
2011 | * disabled early at boot if aa_g_path_max is extremly high. | |
2012 | */ | |
2013 | if (num_online_cpus() > 1) | |
341c1fda | 2014 | num = 4 + RESERVE_COUNT; |
df323337 | 2015 | else |
341c1fda | 2016 | num = 2 + RESERVE_COUNT; |
df323337 SAS |
2017 | |
2018 | for (i = 0; i < num; i++) { | |
2019 | ||
2020 | aa_buf = kmalloc(aa_g_path_max, GFP_KERNEL | | |
2021 | __GFP_RETRY_MAYFAIL | __GFP_NOWARN); | |
2022 | if (!aa_buf) { | |
2023 | destroy_buffers(); | |
2024 | return -ENOMEM; | |
d4669f0b | 2025 | } |
ba808cb5 | 2026 | aa_put_buffer(aa_buf->buffer); |
d4669f0b | 2027 | } |
d4669f0b JJ |
2028 | return 0; |
2029 | } | |
2030 | ||
e3ea1ca5 TH |
2031 | #ifdef CONFIG_SYSCTL |
2032 | static int apparmor_dointvec(struct ctl_table *table, int write, | |
32927393 | 2033 | void *buffer, size_t *lenp, loff_t *ppos) |
e3ea1ca5 | 2034 | { |
92de220a | 2035 | if (!aa_current_policy_admin_capable(NULL)) |
e3ea1ca5 TH |
2036 | return -EPERM; |
2037 | if (!apparmor_enabled) | |
2038 | return -EINVAL; | |
2039 | ||
2040 | return proc_dointvec(table, write, buffer, lenp, ppos); | |
2041 | } | |
2042 | ||
e3ea1ca5 | 2043 | static struct ctl_table apparmor_sysctl_table[] = { |
fa9b63ad | 2044 | #ifdef CONFIG_USER_NS |
e3ea1ca5 TH |
2045 | { |
2046 | .procname = "unprivileged_userns_apparmor_policy", | |
2047 | .data = &unprivileged_userns_apparmor_policy, | |
2048 | .maxlen = sizeof(int), | |
2049 | .mode = 0600, | |
2050 | .proc_handler = apparmor_dointvec, | |
2051 | }, | |
fa9b63ad | 2052 | #endif /* CONFIG_USER_NS */ |
524d8e14 JJ |
2053 | { |
2054 | .procname = "apparmor_display_secid_mode", | |
2055 | .data = &apparmor_display_secid_mode, | |
2056 | .maxlen = sizeof(int), | |
2057 | .mode = 0600, | |
2058 | .proc_handler = apparmor_dointvec, | |
2059 | }, | |
2d9da9b1 JJ |
2060 | { |
2061 | .procname = "apparmor_restrict_unprivileged_unconfined", | |
2062 | .data = &aa_unprivileged_unconfined_restricted, | |
2063 | .maxlen = sizeof(int), | |
2064 | .mode = 0600, | |
2065 | .proc_handler = apparmor_dointvec, | |
2066 | }, | |
e3ea1ca5 TH |
2067 | }; |
2068 | ||
2069 | static int __init apparmor_init_sysctl(void) | |
2070 | { | |
96200952 | 2071 | return register_sysctl("kernel", apparmor_sysctl_table) ? 0 : -ENOMEM; |
e3ea1ca5 TH |
2072 | } |
2073 | #else | |
2074 | static inline int apparmor_init_sysctl(void) | |
2075 | { | |
2076 | return 0; | |
2077 | } | |
2078 | #endif /* CONFIG_SYSCTL */ | |
2079 | ||
e1af4779 | 2080 | #if defined(CONFIG_NETFILTER) && defined(CONFIG_NETWORK_SECMARK) |
ab9f2115 MG |
2081 | static unsigned int apparmor_ip_postroute(void *priv, |
2082 | struct sk_buff *skb, | |
2083 | const struct nf_hook_state *state) | |
2084 | { | |
2085 | struct aa_sk_ctx *ctx; | |
2086 | struct sock *sk; | |
2087 | ||
2088 | if (!skb->secmark) | |
2089 | return NF_ACCEPT; | |
2090 | ||
2091 | sk = skb_to_full_sk(skb); | |
2092 | if (sk == NULL) | |
2093 | return NF_ACCEPT; | |
2094 | ||
79ddd4a7 | 2095 | ctx = aa_sock(sk); |
ab9f2115 MG |
2096 | if (!apparmor_secmark_check(ctx->label, OP_SENDMSG, AA_MAY_SEND, |
2097 | skb->secmark, sk)) | |
2098 | return NF_ACCEPT; | |
2099 | ||
2100 | return NF_DROP_ERR(-ECONNREFUSED); | |
2101 | ||
2102 | } | |
2103 | ||
ab9f2115 MG |
2104 | static const struct nf_hook_ops apparmor_nf_ops[] = { |
2105 | { | |
7b721124 | 2106 | .hook = apparmor_ip_postroute, |
ab9f2115 MG |
2107 | .pf = NFPROTO_IPV4, |
2108 | .hooknum = NF_INET_POST_ROUTING, | |
2109 | .priority = NF_IP_PRI_SELINUX_FIRST, | |
2110 | }, | |
2111 | #if IS_ENABLED(CONFIG_IPV6) | |
2112 | { | |
7b721124 | 2113 | .hook = apparmor_ip_postroute, |
ab9f2115 MG |
2114 | .pf = NFPROTO_IPV6, |
2115 | .hooknum = NF_INET_POST_ROUTING, | |
2116 | .priority = NF_IP6_PRI_SELINUX_FIRST, | |
2117 | }, | |
2118 | #endif | |
2119 | }; | |
2120 | ||
2121 | static int __net_init apparmor_nf_register(struct net *net) | |
2122 | { | |
84117994 | 2123 | return nf_register_net_hooks(net, apparmor_nf_ops, |
ab9f2115 | 2124 | ARRAY_SIZE(apparmor_nf_ops)); |
ab9f2115 MG |
2125 | } |
2126 | ||
2127 | static void __net_exit apparmor_nf_unregister(struct net *net) | |
2128 | { | |
2129 | nf_unregister_net_hooks(net, apparmor_nf_ops, | |
2130 | ARRAY_SIZE(apparmor_nf_ops)); | |
2131 | } | |
2132 | ||
2133 | static struct pernet_operations apparmor_net_ops = { | |
2134 | .init = apparmor_nf_register, | |
2135 | .exit = apparmor_nf_unregister, | |
2136 | }; | |
2137 | ||
2138 | static int __init apparmor_nf_ip_init(void) | |
2139 | { | |
2140 | int err; | |
2141 | ||
2142 | if (!apparmor_enabled) | |
2143 | return 0; | |
2144 | ||
2145 | err = register_pernet_subsys(&apparmor_net_ops); | |
2146 | if (err) | |
2147 | panic("Apparmor: register_pernet_subsys: error %d\n", err); | |
2148 | ||
2149 | return 0; | |
2150 | } | |
2151 | __initcall(apparmor_nf_ip_init); | |
e1af4779 | 2152 | #endif |
ab9f2115 | 2153 | |
98b824ff JJ |
2154 | static char nulldfa_src[] = { |
2155 | #include "nulldfa.in" | |
2156 | }; | |
735ad5d1 | 2157 | static struct aa_dfa *nulldfa; |
98b824ff JJ |
2158 | |
2159 | static char stacksplitdfa_src[] = { | |
2160 | #include "stacksplitdfa.in" | |
2161 | }; | |
2162 | struct aa_dfa *stacksplitdfa; | |
2163 | struct aa_policydb *nullpdb; | |
2164 | ||
2165 | static int __init aa_setup_dfa_engine(void) | |
2166 | { | |
2167 | int error = -ENOMEM; | |
2168 | ||
2169 | nullpdb = aa_alloc_pdb(GFP_KERNEL); | |
2170 | if (!nullpdb) | |
2171 | return -ENOMEM; | |
2172 | ||
2173 | nulldfa = aa_dfa_unpack(nulldfa_src, sizeof(nulldfa_src), | |
2174 | TO_ACCEPT1_FLAG(YYTD_DATA32) | | |
2175 | TO_ACCEPT2_FLAG(YYTD_DATA32)); | |
2176 | if (IS_ERR(nulldfa)) { | |
2177 | error = PTR_ERR(nulldfa); | |
2178 | goto fail; | |
2179 | } | |
2180 | nullpdb->dfa = aa_get_dfa(nulldfa); | |
2181 | nullpdb->perms = kcalloc(2, sizeof(struct aa_perms), GFP_KERNEL); | |
2182 | if (!nullpdb->perms) | |
2183 | goto fail; | |
2184 | nullpdb->size = 2; | |
2185 | ||
2186 | stacksplitdfa = aa_dfa_unpack(stacksplitdfa_src, | |
2187 | sizeof(stacksplitdfa_src), | |
2188 | TO_ACCEPT1_FLAG(YYTD_DATA32) | | |
2189 | TO_ACCEPT2_FLAG(YYTD_DATA32)); | |
2190 | if (IS_ERR(stacksplitdfa)) { | |
2191 | error = PTR_ERR(stacksplitdfa); | |
2192 | goto fail; | |
2193 | } | |
2194 | ||
2195 | return 0; | |
2196 | ||
2197 | fail: | |
2198 | aa_put_pdb(nullpdb); | |
2199 | aa_put_dfa(nulldfa); | |
2200 | nullpdb = NULL; | |
2201 | nulldfa = NULL; | |
2202 | stacksplitdfa = NULL; | |
2203 | ||
2204 | return error; | |
2205 | } | |
2206 | ||
2207 | static void __init aa_teardown_dfa_engine(void) | |
2208 | { | |
2209 | aa_put_dfa(stacksplitdfa); | |
2210 | aa_put_dfa(nulldfa); | |
2211 | aa_put_pdb(nullpdb); | |
2212 | nullpdb = NULL; | |
2213 | stacksplitdfa = NULL; | |
2214 | nulldfa = NULL; | |
2215 | } | |
2216 | ||
b5e95b48 JJ |
2217 | static int __init apparmor_init(void) |
2218 | { | |
2219 | int error; | |
2220 | ||
11c236b8 JJ |
2221 | error = aa_setup_dfa_engine(); |
2222 | if (error) { | |
2223 | AA_ERROR("Unable to setup dfa engine\n"); | |
2224 | goto alloc_out; | |
2225 | } | |
2226 | ||
b5e95b48 JJ |
2227 | error = aa_alloc_root_ns(); |
2228 | if (error) { | |
2229 | AA_ERROR("Unable to allocate default profile namespace\n"); | |
2230 | goto alloc_out; | |
2231 | } | |
2232 | ||
e3ea1ca5 TH |
2233 | error = apparmor_init_sysctl(); |
2234 | if (error) { | |
2235 | AA_ERROR("Unable to register sysctls\n"); | |
2236 | goto alloc_out; | |
2237 | ||
2238 | } | |
2239 | ||
d4669f0b JJ |
2240 | error = alloc_buffers(); |
2241 | if (error) { | |
2242 | AA_ERROR("Unable to allocate work buffers\n"); | |
df323337 | 2243 | goto alloc_out; |
d4669f0b JJ |
2244 | } |
2245 | ||
55a26ebf | 2246 | error = set_init_ctx(); |
b5e95b48 JJ |
2247 | if (error) { |
2248 | AA_ERROR("Failed to set context on init task\n"); | |
b1d9e6b0 | 2249 | aa_free_root_ns(); |
d4669f0b | 2250 | goto buffers_out; |
b5e95b48 | 2251 | } |
d69dece5 | 2252 | security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks), |
f3b8788c | 2253 | &apparmor_lsmid); |
b5e95b48 JJ |
2254 | |
2255 | /* Report that AppArmor successfully initialized */ | |
2256 | apparmor_initialized = 1; | |
2257 | if (aa_g_profile_mode == APPARMOR_COMPLAIN) | |
2258 | aa_info_message("AppArmor initialized: complain mode enabled"); | |
2259 | else if (aa_g_profile_mode == APPARMOR_KILL) | |
2260 | aa_info_message("AppArmor initialized: kill mode enabled"); | |
2261 | else | |
2262 | aa_info_message("AppArmor initialized"); | |
2263 | ||
2264 | return error; | |
2265 | ||
d4669f0b JJ |
2266 | buffers_out: |
2267 | destroy_buffers(); | |
b5e95b48 JJ |
2268 | alloc_out: |
2269 | aa_destroy_aafs(); | |
11c236b8 | 2270 | aa_teardown_dfa_engine(); |
b5e95b48 | 2271 | |
954317fe | 2272 | apparmor_enabled = false; |
b5e95b48 | 2273 | return error; |
b5e95b48 JJ |
2274 | } |
2275 | ||
3d6e5f6d | 2276 | DEFINE_LSM(apparmor) = { |
07aed2f2 | 2277 | .name = "apparmor", |
14bd99c8 | 2278 | .flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE, |
c5459b82 | 2279 | .enabled = &apparmor_enabled, |
bbd3662a | 2280 | .blobs = &apparmor_blob_sizes, |
3d6e5f6d KC |
2281 | .init = apparmor_init, |
2282 | }; |