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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> | |
63c16c3a | 24 | #include <linux/zlib.h> |
b5e95b48 | 25 | #include <net/sock.h> |
e262e32d | 26 | #include <uapi/linux/mount.h> |
b5e95b48 JJ |
27 | |
28 | #include "include/apparmor.h" | |
29 | #include "include/apparmorfs.h" | |
30 | #include "include/audit.h" | |
31 | #include "include/capability.h" | |
d8889d49 | 32 | #include "include/cred.h" |
b5e95b48 JJ |
33 | #include "include/file.h" |
34 | #include "include/ipc.h" | |
56974a6f | 35 | #include "include/net.h" |
b5e95b48 | 36 | #include "include/path.h" |
637f688d | 37 | #include "include/label.h" |
b5e95b48 | 38 | #include "include/policy.h" |
cff281f6 | 39 | #include "include/policy_ns.h" |
b5e95b48 | 40 | #include "include/procattr.h" |
2ea3ffb7 | 41 | #include "include/mount.h" |
c0929212 | 42 | #include "include/secid.h" |
b5e95b48 JJ |
43 | |
44 | /* Flag indicating whether initialization completed */ | |
545de8fe | 45 | int apparmor_initialized; |
b5e95b48 | 46 | |
df323337 SAS |
47 | union aa_buffer { |
48 | struct list_head list; | |
49 | char buffer[1]; | |
50 | }; | |
d4669f0b | 51 | |
341c1fda JJ |
52 | #define RESERVE_COUNT 2 |
53 | static int reserve_count = RESERVE_COUNT; | |
54 | static int buffer_count; | |
d4669f0b | 55 | |
df323337 SAS |
56 | static LIST_HEAD(aa_global_buffers); |
57 | static DEFINE_SPINLOCK(aa_buffers_lock); | |
d4669f0b | 58 | |
b5e95b48 JJ |
59 | /* |
60 | * LSM hook functions | |
61 | */ | |
62 | ||
63 | /* | |
d9087c49 | 64 | * put the associated labels |
b5e95b48 JJ |
65 | */ |
66 | static void apparmor_cred_free(struct cred *cred) | |
67 | { | |
d9087c49 | 68 | aa_put_label(cred_label(cred)); |
69b5a44a | 69 | set_cred_label(cred, NULL); |
b5e95b48 JJ |
70 | } |
71 | ||
72 | /* | |
73 | * allocate the apparmor part of blank credentials | |
74 | */ | |
75 | static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
76 | { | |
69b5a44a | 77 | set_cred_label(cred, NULL); |
b5e95b48 JJ |
78 | return 0; |
79 | } | |
80 | ||
81 | /* | |
d9087c49 | 82 | * prepare new cred label for modification by prepare_cred block |
b5e95b48 JJ |
83 | */ |
84 | static int apparmor_cred_prepare(struct cred *new, const struct cred *old, | |
85 | gfp_t gfp) | |
86 | { | |
69b5a44a | 87 | set_cred_label(new, aa_get_newest_label(cred_label(old))); |
b5e95b48 JJ |
88 | return 0; |
89 | } | |
90 | ||
91 | /* | |
92 | * transfer the apparmor data to a blank set of creds | |
93 | */ | |
94 | static void apparmor_cred_transfer(struct cred *new, const struct cred *old) | |
95 | { | |
69b5a44a | 96 | set_cred_label(new, aa_get_newest_label(cred_label(old))); |
b5e95b48 JJ |
97 | } |
98 | ||
3b529a76 JJ |
99 | static void apparmor_task_free(struct task_struct *task) |
100 | { | |
101 | ||
102 | aa_free_task_ctx(task_ctx(task)); | |
3b529a76 JJ |
103 | } |
104 | ||
105 | static int apparmor_task_alloc(struct task_struct *task, | |
106 | unsigned long clone_flags) | |
107 | { | |
f4ad8f2c | 108 | struct aa_task_ctx *new = task_ctx(task); |
3b529a76 | 109 | |
de62de59 | 110 | aa_dup_task_ctx(new, task_ctx(current)); |
b5e95b48 | 111 | |
3b529a76 | 112 | return 0; |
b5e95b48 JJ |
113 | } |
114 | ||
115 | static int apparmor_ptrace_access_check(struct task_struct *child, | |
116 | unsigned int mode) | |
117 | { | |
b2d09ae4 JJ |
118 | struct aa_label *tracer, *tracee; |
119 | int error; | |
120 | ||
1f8266ff | 121 | tracer = __begin_current_label_crit_section(); |
b2d09ae4 JJ |
122 | tracee = aa_get_task_label(child); |
123 | error = aa_may_ptrace(tracer, tracee, | |
338d0be4 JJ |
124 | (mode & PTRACE_MODE_READ) ? AA_PTRACE_READ |
125 | : AA_PTRACE_TRACE); | |
b2d09ae4 | 126 | aa_put_label(tracee); |
1f8266ff | 127 | __end_current_label_crit_section(tracer); |
b2d09ae4 JJ |
128 | |
129 | return error; | |
b5e95b48 JJ |
130 | } |
131 | ||
132 | static int apparmor_ptrace_traceme(struct task_struct *parent) | |
133 | { | |
b2d09ae4 JJ |
134 | struct aa_label *tracer, *tracee; |
135 | int error; | |
136 | ||
ca3fde52 | 137 | tracee = __begin_current_label_crit_section(); |
b2d09ae4 JJ |
138 | tracer = aa_get_task_label(parent); |
139 | error = aa_may_ptrace(tracer, tracee, AA_PTRACE_TRACE); | |
140 | aa_put_label(tracer); | |
ca3fde52 | 141 | __end_current_label_crit_section(tracee); |
b2d09ae4 JJ |
142 | |
143 | return error; | |
b5e95b48 JJ |
144 | } |
145 | ||
146 | /* Derived from security/commoncap.c:cap_capget */ | |
147 | static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective, | |
148 | kernel_cap_t *inheritable, kernel_cap_t *permitted) | |
149 | { | |
637f688d | 150 | struct aa_label *label; |
b5e95b48 JJ |
151 | const struct cred *cred; |
152 | ||
153 | rcu_read_lock(); | |
154 | cred = __task_cred(target); | |
637f688d | 155 | label = aa_get_newest_cred_label(cred); |
c70c86c4 | 156 | |
b1d9e6b0 CS |
157 | /* |
158 | * cap_capget is stacked ahead of this and will | |
159 | * initialize effective and permitted. | |
160 | */ | |
c70c86c4 JJ |
161 | if (!unconfined(label)) { |
162 | struct aa_profile *profile; | |
163 | struct label_it i; | |
164 | ||
165 | label_for_each_confined(i, label, profile) { | |
166 | if (COMPLAIN_MODE(profile)) | |
167 | continue; | |
168 | *effective = cap_intersect(*effective, | |
169 | profile->caps.allow); | |
170 | *permitted = cap_intersect(*permitted, | |
171 | profile->caps.allow); | |
172 | } | |
b5e95b48 JJ |
173 | } |
174 | rcu_read_unlock(); | |
637f688d | 175 | aa_put_label(label); |
b5e95b48 JJ |
176 | |
177 | return 0; | |
178 | } | |
179 | ||
6a9de491 | 180 | static int apparmor_capable(const struct cred *cred, struct user_namespace *ns, |
c1a85a00 | 181 | int cap, unsigned int opts) |
b5e95b48 | 182 | { |
637f688d | 183 | struct aa_label *label; |
b1d9e6b0 CS |
184 | int error = 0; |
185 | ||
637f688d JJ |
186 | label = aa_get_newest_cred_label(cred); |
187 | if (!unconfined(label)) | |
c1a85a00 | 188 | error = aa_capable(label, cap, opts); |
637f688d | 189 | aa_put_label(label); |
cf797c0e | 190 | |
b5e95b48 JJ |
191 | return error; |
192 | } | |
193 | ||
194 | /** | |
195 | * common_perm - basic common permission check wrapper fn for paths | |
196 | * @op: operation being checked | |
197 | * @path: path to check permission of (NOT NULL) | |
198 | * @mask: requested permissions mask | |
199 | * @cond: conditional info for the permission request (NOT NULL) | |
200 | * | |
201 | * Returns: %0 else error code if error or permission denied | |
202 | */ | |
47f6e5cc | 203 | static int common_perm(const char *op, const struct path *path, u32 mask, |
b5e95b48 JJ |
204 | struct path_cond *cond) |
205 | { | |
637f688d | 206 | struct aa_label *label; |
b5e95b48 JJ |
207 | int error = 0; |
208 | ||
637f688d JJ |
209 | label = __begin_current_label_crit_section(); |
210 | if (!unconfined(label)) | |
aebd873e | 211 | error = aa_path_perm(op, label, path, 0, mask, cond); |
637f688d | 212 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
213 | |
214 | return error; | |
215 | } | |
216 | ||
217 | /** | |
31f75bfe | 218 | * common_perm_cond - common permission wrapper around inode cond |
b5e95b48 | 219 | * @op: operation being checked |
31f75bfe | 220 | * @path: location to check (NOT NULL) |
b5e95b48 | 221 | * @mask: requested permissions mask |
b5e95b48 JJ |
222 | * |
223 | * Returns: %0 else error code if error or permission denied | |
224 | */ | |
31f75bfe | 225 | static int common_perm_cond(const char *op, const struct path *path, u32 mask) |
b5e95b48 | 226 | { |
3cee6079 CB |
227 | struct user_namespace *mnt_userns = mnt_user_ns(path->mnt); |
228 | struct path_cond cond = { | |
229 | i_uid_into_mnt(mnt_userns, d_backing_inode(path->dentry)), | |
230 | d_backing_inode(path->dentry)->i_mode | |
31f75bfe | 231 | }; |
b5e95b48 | 232 | |
31f75bfe JJ |
233 | if (!path_mediated_fs(path->dentry)) |
234 | return 0; | |
235 | ||
236 | return common_perm(op, path, mask, &cond); | |
b5e95b48 JJ |
237 | } |
238 | ||
239 | /** | |
31f75bfe | 240 | * common_perm_dir_dentry - common permission wrapper when path is dir, dentry |
b5e95b48 | 241 | * @op: operation being checked |
31f75bfe JJ |
242 | * @dir: directory of the dentry (NOT NULL) |
243 | * @dentry: dentry to check (NOT NULL) | |
b5e95b48 | 244 | * @mask: requested permissions mask |
31f75bfe | 245 | * @cond: conditional info for the permission request (NOT NULL) |
b5e95b48 JJ |
246 | * |
247 | * Returns: %0 else error code if error or permission denied | |
248 | */ | |
31f75bfe JJ |
249 | static int common_perm_dir_dentry(const char *op, const struct path *dir, |
250 | struct dentry *dentry, u32 mask, | |
251 | struct path_cond *cond) | |
b5e95b48 | 252 | { |
31f75bfe | 253 | struct path path = { .mnt = dir->mnt, .dentry = dentry }; |
b5e95b48 | 254 | |
31f75bfe | 255 | return common_perm(op, &path, mask, cond); |
b5e95b48 JJ |
256 | } |
257 | ||
258 | /** | |
259 | * common_perm_rm - common permission wrapper for operations doing rm | |
260 | * @op: operation being checked | |
261 | * @dir: directory that the dentry is in (NOT NULL) | |
262 | * @dentry: dentry being rm'd (NOT NULL) | |
263 | * @mask: requested permission mask | |
264 | * | |
265 | * Returns: %0 else error code if error or permission denied | |
266 | */ | |
47f6e5cc | 267 | static int common_perm_rm(const char *op, const struct path *dir, |
b5e95b48 JJ |
268 | struct dentry *dentry, u32 mask) |
269 | { | |
c6f493d6 | 270 | struct inode *inode = d_backing_inode(dentry); |
3cee6079 | 271 | struct user_namespace *mnt_userns = mnt_user_ns(dir->mnt); |
b5e95b48 JJ |
272 | struct path_cond cond = { }; |
273 | ||
efeee83a | 274 | if (!inode || !path_mediated_fs(dentry)) |
b5e95b48 JJ |
275 | return 0; |
276 | ||
3cee6079 | 277 | cond.uid = i_uid_into_mnt(mnt_userns, inode); |
b5e95b48 JJ |
278 | cond.mode = inode->i_mode; |
279 | ||
280 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
281 | } | |
282 | ||
283 | /** | |
284 | * common_perm_create - common permission wrapper for operations doing create | |
285 | * @op: operation being checked | |
286 | * @dir: directory that dentry will be created in (NOT NULL) | |
287 | * @dentry: dentry to create (NOT NULL) | |
288 | * @mask: request permission mask | |
289 | * @mode: created file mode | |
290 | * | |
291 | * Returns: %0 else error code if error or permission denied | |
292 | */ | |
47f6e5cc | 293 | static int common_perm_create(const char *op, const struct path *dir, |
d6b49f7a | 294 | struct dentry *dentry, u32 mask, umode_t mode) |
b5e95b48 JJ |
295 | { |
296 | struct path_cond cond = { current_fsuid(), mode }; | |
297 | ||
efeee83a | 298 | if (!path_mediated_fs(dir->dentry)) |
b5e95b48 JJ |
299 | return 0; |
300 | ||
301 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
302 | } | |
303 | ||
989f74e0 | 304 | static int apparmor_path_unlink(const struct path *dir, struct dentry *dentry) |
b5e95b48 JJ |
305 | { |
306 | return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE); | |
307 | } | |
308 | ||
d3607752 | 309 | static int apparmor_path_mkdir(const struct path *dir, struct dentry *dentry, |
4572befe | 310 | umode_t mode) |
b5e95b48 JJ |
311 | { |
312 | return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE, | |
313 | S_IFDIR); | |
314 | } | |
315 | ||
989f74e0 | 316 | static int apparmor_path_rmdir(const struct path *dir, struct dentry *dentry) |
b5e95b48 JJ |
317 | { |
318 | return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE); | |
319 | } | |
320 | ||
d3607752 | 321 | static int apparmor_path_mknod(const struct path *dir, struct dentry *dentry, |
04fc66e7 | 322 | umode_t mode, unsigned int dev) |
b5e95b48 JJ |
323 | { |
324 | return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode); | |
325 | } | |
326 | ||
81f4c506 | 327 | static int apparmor_path_truncate(const struct path *path) |
b5e95b48 | 328 | { |
e53cfe6c | 329 | return common_perm_cond(OP_TRUNC, path, MAY_WRITE | AA_MAY_SETATTR); |
b5e95b48 JJ |
330 | } |
331 | ||
3350607d GN |
332 | static int apparmor_file_truncate(struct file *file) |
333 | { | |
334 | return apparmor_path_truncate(&file->f_path); | |
335 | } | |
336 | ||
d3607752 | 337 | static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry, |
b5e95b48 JJ |
338 | const char *old_name) |
339 | { | |
340 | return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE, | |
341 | S_IFLNK); | |
342 | } | |
343 | ||
3ccee46a | 344 | static int apparmor_path_link(struct dentry *old_dentry, const struct path *new_dir, |
b5e95b48 JJ |
345 | struct dentry *new_dentry) |
346 | { | |
637f688d | 347 | struct aa_label *label; |
b5e95b48 JJ |
348 | int error = 0; |
349 | ||
efeee83a | 350 | if (!path_mediated_fs(old_dentry)) |
b5e95b48 JJ |
351 | return 0; |
352 | ||
637f688d JJ |
353 | label = begin_current_label_crit_section(); |
354 | if (!unconfined(label)) | |
8014370f | 355 | error = aa_path_link(label, old_dentry, new_dir, new_dentry); |
637f688d | 356 | end_current_label_crit_section(label); |
cf797c0e | 357 | |
b5e95b48 JJ |
358 | return error; |
359 | } | |
360 | ||
3ccee46a | 361 | static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry, |
100f59d9 MS |
362 | const struct path *new_dir, struct dentry *new_dentry, |
363 | const unsigned int flags) | |
b5e95b48 | 364 | { |
637f688d | 365 | struct aa_label *label; |
b5e95b48 JJ |
366 | int error = 0; |
367 | ||
efeee83a | 368 | if (!path_mediated_fs(old_dentry)) |
b5e95b48 | 369 | return 0; |
100f59d9 MS |
370 | if ((flags & RENAME_EXCHANGE) && !path_mediated_fs(new_dentry)) |
371 | return 0; | |
b5e95b48 | 372 | |
637f688d JJ |
373 | label = begin_current_label_crit_section(); |
374 | if (!unconfined(label)) { | |
3cee6079 | 375 | struct user_namespace *mnt_userns = mnt_user_ns(old_dir->mnt); |
8486adf0 KC |
376 | struct path old_path = { .mnt = old_dir->mnt, |
377 | .dentry = old_dentry }; | |
378 | struct path new_path = { .mnt = new_dir->mnt, | |
379 | .dentry = new_dentry }; | |
3cee6079 CB |
380 | struct path_cond cond = { |
381 | i_uid_into_mnt(mnt_userns, d_backing_inode(old_dentry)), | |
382 | d_backing_inode(old_dentry)->i_mode | |
b5e95b48 JJ |
383 | }; |
384 | ||
100f59d9 MS |
385 | if (flags & RENAME_EXCHANGE) { |
386 | struct path_cond cond_exchange = { | |
387 | i_uid_into_mnt(mnt_userns, d_backing_inode(new_dentry)), | |
388 | d_backing_inode(new_dentry)->i_mode | |
389 | }; | |
390 | ||
391 | error = aa_path_perm(OP_RENAME_SRC, label, &new_path, 0, | |
392 | MAY_READ | AA_MAY_GETATTR | MAY_WRITE | | |
393 | AA_MAY_SETATTR | AA_MAY_DELETE, | |
394 | &cond_exchange); | |
395 | if (!error) | |
396 | error = aa_path_perm(OP_RENAME_DEST, label, &old_path, | |
397 | 0, MAY_WRITE | AA_MAY_SETATTR | | |
398 | AA_MAY_CREATE, &cond_exchange); | |
399 | } | |
400 | ||
401 | if (!error) | |
402 | error = aa_path_perm(OP_RENAME_SRC, label, &old_path, 0, | |
403 | MAY_READ | AA_MAY_GETATTR | MAY_WRITE | | |
404 | AA_MAY_SETATTR | AA_MAY_DELETE, | |
405 | &cond); | |
b5e95b48 | 406 | if (!error) |
aebd873e | 407 | error = aa_path_perm(OP_RENAME_DEST, label, &new_path, |
e53cfe6c | 408 | 0, MAY_WRITE | AA_MAY_SETATTR | |
b5e95b48 JJ |
409 | AA_MAY_CREATE, &cond); |
410 | ||
411 | } | |
637f688d | 412 | end_current_label_crit_section(label); |
cf797c0e | 413 | |
b5e95b48 JJ |
414 | return error; |
415 | } | |
416 | ||
be01f9f2 | 417 | static int apparmor_path_chmod(const struct path *path, umode_t mode) |
b5e95b48 | 418 | { |
31f75bfe | 419 | return common_perm_cond(OP_CHMOD, path, AA_MAY_CHMOD); |
b5e95b48 JJ |
420 | } |
421 | ||
7fd25dac | 422 | static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid) |
b5e95b48 | 423 | { |
31f75bfe | 424 | return common_perm_cond(OP_CHOWN, path, AA_MAY_CHOWN); |
b5e95b48 JJ |
425 | } |
426 | ||
3f7036a0 | 427 | static int apparmor_inode_getattr(const struct path *path) |
b5e95b48 | 428 | { |
e53cfe6c | 429 | return common_perm_cond(OP_GETATTR, path, AA_MAY_GETATTR); |
b5e95b48 JJ |
430 | } |
431 | ||
94817692 | 432 | static int apparmor_file_open(struct file *file) |
b5e95b48 | 433 | { |
637f688d JJ |
434 | struct aa_file_ctx *fctx = file_ctx(file); |
435 | struct aa_label *label; | |
b5e95b48 JJ |
436 | int error = 0; |
437 | ||
efeee83a | 438 | if (!path_mediated_fs(file->f_path.dentry)) |
b5e95b48 JJ |
439 | return 0; |
440 | ||
441 | /* If in exec, permission is handled by bprm hooks. | |
442 | * Cache permissions granted by the previous exec check, with | |
443 | * implicit read and executable mmap which are required to | |
444 | * actually execute the image. | |
445 | */ | |
446 | if (current->in_execve) { | |
55a26ebf | 447 | fctx->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP; |
b5e95b48 JJ |
448 | return 0; |
449 | } | |
450 | ||
94817692 | 451 | label = aa_get_newest_cred_label(file->f_cred); |
637f688d | 452 | if (!unconfined(label)) { |
3cee6079 | 453 | struct user_namespace *mnt_userns = file_mnt_user_ns(file); |
496ad9aa | 454 | struct inode *inode = file_inode(file); |
3cee6079 CB |
455 | struct path_cond cond = { |
456 | i_uid_into_mnt(mnt_userns, inode), | |
457 | inode->i_mode | |
458 | }; | |
b5e95b48 | 459 | |
aebd873e | 460 | error = aa_path_perm(OP_OPEN, label, &file->f_path, 0, |
b5e95b48 JJ |
461 | aa_map_file_to_perms(file), &cond); |
462 | /* todo cache full allowed permissions set and state */ | |
55a26ebf | 463 | fctx->allow = aa_map_file_to_perms(file); |
b5e95b48 | 464 | } |
637f688d | 465 | aa_put_label(label); |
b5e95b48 JJ |
466 | |
467 | return error; | |
468 | } | |
469 | ||
470 | static int apparmor_file_alloc_security(struct file *file) | |
471 | { | |
33bf60ca | 472 | struct aa_file_ctx *ctx = file_ctx(file); |
637f688d | 473 | struct aa_label *label = begin_current_label_crit_section(); |
b5e95b48 | 474 | |
33bf60ca CS |
475 | spin_lock_init(&ctx->lock); |
476 | rcu_assign_pointer(ctx->label, aa_get_label(label)); | |
477 | end_current_label_crit_section(label); | |
478 | return 0; | |
b5e95b48 JJ |
479 | } |
480 | ||
481 | static void apparmor_file_free_security(struct file *file) | |
482 | { | |
33bf60ca CS |
483 | struct aa_file_ctx *ctx = file_ctx(file); |
484 | ||
485 | if (ctx) | |
486 | aa_put_label(rcu_access_pointer(ctx->label)); | |
b5e95b48 JJ |
487 | } |
488 | ||
341c1fda JJ |
489 | static int common_file_perm(const char *op, struct file *file, u32 mask, |
490 | bool in_atomic) | |
b5e95b48 | 491 | { |
190a9518 | 492 | struct aa_label *label; |
b5e95b48 JJ |
493 | int error = 0; |
494 | ||
192ca6b5 JJ |
495 | /* don't reaudit files closed during inheritance */ |
496 | if (file->f_path.dentry == aa_null.dentry) | |
497 | return -EACCES; | |
498 | ||
637f688d | 499 | label = __begin_current_label_crit_section(); |
341c1fda | 500 | error = aa_file_perm(op, label, file, mask, in_atomic); |
637f688d | 501 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
502 | |
503 | return error; | |
504 | } | |
505 | ||
064dc947 JJ |
506 | static int apparmor_file_receive(struct file *file) |
507 | { | |
341c1fda JJ |
508 | return common_file_perm(OP_FRECEIVE, file, aa_map_file_to_perms(file), |
509 | false); | |
064dc947 JJ |
510 | } |
511 | ||
b5e95b48 JJ |
512 | static int apparmor_file_permission(struct file *file, int mask) |
513 | { | |
341c1fda | 514 | return common_file_perm(OP_FPERM, file, mask, false); |
b5e95b48 JJ |
515 | } |
516 | ||
517 | static int apparmor_file_lock(struct file *file, unsigned int cmd) | |
518 | { | |
519 | u32 mask = AA_MAY_LOCK; | |
520 | ||
521 | if (cmd == F_WRLCK) | |
522 | mask |= MAY_WRITE; | |
523 | ||
341c1fda | 524 | return common_file_perm(OP_FLOCK, file, mask, false); |
b5e95b48 JJ |
525 | } |
526 | ||
47f6e5cc | 527 | static int common_mmap(const char *op, struct file *file, unsigned long prot, |
341c1fda | 528 | unsigned long flags, bool in_atomic) |
b5e95b48 | 529 | { |
b5e95b48 JJ |
530 | int mask = 0; |
531 | ||
637f688d | 532 | if (!file || !file_ctx(file)) |
b5e95b48 JJ |
533 | return 0; |
534 | ||
535 | if (prot & PROT_READ) | |
536 | mask |= MAY_READ; | |
537 | /* | |
538 | * Private mappings don't require write perms since they don't | |
539 | * write back to the files | |
540 | */ | |
541 | if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE)) | |
542 | mask |= MAY_WRITE; | |
543 | if (prot & PROT_EXEC) | |
544 | mask |= AA_EXEC_MMAP; | |
545 | ||
341c1fda | 546 | return common_file_perm(op, file, mask, in_atomic); |
b5e95b48 JJ |
547 | } |
548 | ||
e5467859 AV |
549 | static int apparmor_mmap_file(struct file *file, unsigned long reqprot, |
550 | unsigned long prot, unsigned long flags) | |
b5e95b48 | 551 | { |
341c1fda | 552 | return common_mmap(OP_FMMAP, file, prot, flags, GFP_ATOMIC); |
b5e95b48 JJ |
553 | } |
554 | ||
555 | static int apparmor_file_mprotect(struct vm_area_struct *vma, | |
556 | unsigned long reqprot, unsigned long prot) | |
557 | { | |
558 | return common_mmap(OP_FMPROT, vma->vm_file, prot, | |
341c1fda JJ |
559 | !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0, |
560 | false); | |
b5e95b48 JJ |
561 | } |
562 | ||
2ea3ffb7 JJ |
563 | static int apparmor_sb_mount(const char *dev_name, const struct path *path, |
564 | const char *type, unsigned long flags, void *data) | |
565 | { | |
566 | struct aa_label *label; | |
567 | int error = 0; | |
568 | ||
569 | /* Discard magic */ | |
570 | if ((flags & MS_MGC_MSK) == MS_MGC_VAL) | |
571 | flags &= ~MS_MGC_MSK; | |
572 | ||
573 | flags &= ~AA_MS_IGNORE_MASK; | |
574 | ||
575 | label = __begin_current_label_crit_section(); | |
576 | if (!unconfined(label)) { | |
577 | if (flags & MS_REMOUNT) | |
578 | error = aa_remount(label, path, flags, data); | |
579 | else if (flags & MS_BIND) | |
580 | error = aa_bind_mount(label, path, dev_name, flags); | |
581 | else if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE | | |
582 | MS_UNBINDABLE)) | |
583 | error = aa_mount_change_type(label, path, flags); | |
584 | else if (flags & MS_MOVE) | |
585 | error = aa_move_mount(label, path, dev_name); | |
586 | else | |
587 | error = aa_new_mount(label, dev_name, path, type, | |
588 | flags, data); | |
589 | } | |
590 | __end_current_label_crit_section(label); | |
591 | ||
592 | return error; | |
593 | } | |
594 | ||
595 | static int apparmor_sb_umount(struct vfsmount *mnt, int flags) | |
596 | { | |
597 | struct aa_label *label; | |
598 | int error = 0; | |
599 | ||
600 | label = __begin_current_label_crit_section(); | |
601 | if (!unconfined(label)) | |
602 | error = aa_umount(label, mnt, flags); | |
603 | __end_current_label_crit_section(label); | |
604 | ||
605 | return error; | |
606 | } | |
607 | ||
608 | static int apparmor_sb_pivotroot(const struct path *old_path, | |
609 | const struct path *new_path) | |
610 | { | |
611 | struct aa_label *label; | |
612 | int error = 0; | |
613 | ||
614 | label = aa_get_current_label(); | |
615 | if (!unconfined(label)) | |
616 | error = aa_pivotroot(label, old_path, new_path); | |
617 | aa_put_label(label); | |
618 | ||
619 | return error; | |
620 | } | |
621 | ||
c8e477c6 | 622 | static int apparmor_getprocattr(struct task_struct *task, const char *name, |
b5e95b48 JJ |
623 | char **value) |
624 | { | |
625 | int error = -ENOENT; | |
b5e95b48 JJ |
626 | /* released below */ |
627 | const struct cred *cred = get_task_cred(task); | |
de62de59 | 628 | struct aa_task_ctx *ctx = task_ctx(current); |
637f688d | 629 | struct aa_label *label = NULL; |
b5e95b48 JJ |
630 | |
631 | if (strcmp(name, "current") == 0) | |
d9087c49 | 632 | label = aa_get_newest_label(cred_label(cred)); |
55a26ebf | 633 | else if (strcmp(name, "prev") == 0 && ctx->previous) |
637f688d | 634 | label = aa_get_newest_label(ctx->previous); |
55a26ebf | 635 | else if (strcmp(name, "exec") == 0 && ctx->onexec) |
637f688d | 636 | label = aa_get_newest_label(ctx->onexec); |
b5e95b48 JJ |
637 | else |
638 | error = -EINVAL; | |
639 | ||
637f688d | 640 | if (label) |
76a1d263 | 641 | error = aa_getprocattr(label, value); |
77b071b3 | 642 | |
637f688d | 643 | aa_put_label(label); |
b5e95b48 JJ |
644 | put_cred(cred); |
645 | ||
646 | return error; | |
647 | } | |
648 | ||
b21507e2 SS |
649 | static int apparmor_setprocattr(const char *name, void *value, |
650 | size_t size) | |
b5e95b48 | 651 | { |
e89b8081 | 652 | char *command, *largs = NULL, *args = value; |
b5e95b48 JJ |
653 | size_t arg_size; |
654 | int error; | |
ef88a7ac | 655 | DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SETPROCATTR); |
b5e95b48 JJ |
656 | |
657 | if (size == 0) | |
658 | return -EINVAL; | |
b5e95b48 | 659 | |
e89b8081 VN |
660 | /* AppArmor requires that the buffer must be null terminated atm */ |
661 | if (args[size - 1] != '\0') { | |
662 | /* null terminate */ | |
663 | largs = args = kmalloc(size + 1, GFP_KERNEL); | |
664 | if (!args) | |
665 | return -ENOMEM; | |
666 | memcpy(args, value, size); | |
667 | args[size] = '\0'; | |
668 | } | |
669 | ||
670 | error = -EINVAL; | |
b5e95b48 JJ |
671 | args = strim(args); |
672 | command = strsep(&args, " "); | |
673 | if (!args) | |
e89b8081 | 674 | goto out; |
b5e95b48 JJ |
675 | args = skip_spaces(args); |
676 | if (!*args) | |
e89b8081 | 677 | goto out; |
b5e95b48 | 678 | |
d4d03f74 | 679 | arg_size = size - (args - (largs ? largs : (char *) value)); |
b5e95b48 JJ |
680 | if (strcmp(name, "current") == 0) { |
681 | if (strcmp(command, "changehat") == 0) { | |
682 | error = aa_setprocattr_changehat(args, arg_size, | |
df8073c6 | 683 | AA_CHANGE_NOFLAGS); |
b5e95b48 JJ |
684 | } else if (strcmp(command, "permhat") == 0) { |
685 | error = aa_setprocattr_changehat(args, arg_size, | |
df8073c6 | 686 | AA_CHANGE_TEST); |
b5e95b48 | 687 | } else if (strcmp(command, "changeprofile") == 0) { |
df8073c6 | 688 | error = aa_change_profile(args, AA_CHANGE_NOFLAGS); |
b5e95b48 | 689 | } else if (strcmp(command, "permprofile") == 0) { |
df8073c6 | 690 | error = aa_change_profile(args, AA_CHANGE_TEST); |
6c5fc8f1 JJ |
691 | } else if (strcmp(command, "stack") == 0) { |
692 | error = aa_change_profile(args, AA_CHANGE_STACK); | |
3eea57c2 JJ |
693 | } else |
694 | goto fail; | |
b5e95b48 | 695 | } else if (strcmp(name, "exec") == 0) { |
3eea57c2 | 696 | if (strcmp(command, "exec") == 0) |
df8073c6 | 697 | error = aa_change_profile(args, AA_CHANGE_ONEXEC); |
6c5fc8f1 JJ |
698 | else if (strcmp(command, "stack") == 0) |
699 | error = aa_change_profile(args, (AA_CHANGE_ONEXEC | | |
700 | AA_CHANGE_STACK)); | |
3eea57c2 JJ |
701 | else |
702 | goto fail; | |
703 | } else | |
b5e95b48 | 704 | /* only support the "current" and "exec" process attributes */ |
e89b8081 | 705 | goto fail; |
3eea57c2 | 706 | |
b5e95b48 JJ |
707 | if (!error) |
708 | error = size; | |
e89b8081 VN |
709 | out: |
710 | kfree(largs); | |
b5e95b48 | 711 | return error; |
3eea57c2 JJ |
712 | |
713 | fail: | |
637f688d | 714 | aad(&sa)->label = begin_current_label_crit_section(); |
ef88a7ac JJ |
715 | aad(&sa)->info = name; |
716 | aad(&sa)->error = error = -EINVAL; | |
3eea57c2 | 717 | aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL); |
637f688d | 718 | end_current_label_crit_section(aad(&sa)->label); |
e89b8081 | 719 | goto out; |
b5e95b48 JJ |
720 | } |
721 | ||
fe864821 JJ |
722 | /** |
723 | * apparmor_bprm_committing_creds - do task cleanup on committing new creds | |
724 | * @bprm: binprm for the exec (NOT NULL) | |
725 | */ | |
726 | static void apparmor_bprm_committing_creds(struct linux_binprm *bprm) | |
727 | { | |
637f688d | 728 | struct aa_label *label = aa_current_raw_label(); |
d9087c49 | 729 | struct aa_label *new_label = cred_label(bprm->cred); |
fe864821 JJ |
730 | |
731 | /* bail out if unconfined or not changing profile */ | |
d9087c49 JJ |
732 | if ((new_label->proxy == label->proxy) || |
733 | (unconfined(new_label))) | |
fe864821 JJ |
734 | return; |
735 | ||
192ca6b5 JJ |
736 | aa_inherit_files(bprm->cred, current->files); |
737 | ||
fe864821 JJ |
738 | current->pdeath_signal = 0; |
739 | ||
637f688d | 740 | /* reset soft limits and set hard limits for the new label */ |
d9087c49 | 741 | __aa_transition_rlimits(label, new_label); |
fe864821 JJ |
742 | } |
743 | ||
744 | /** | |
745 | * apparmor_bprm_committed_cred - do cleanup after new creds committed | |
746 | * @bprm: binprm for the exec (NOT NULL) | |
747 | */ | |
748 | static void apparmor_bprm_committed_creds(struct linux_binprm *bprm) | |
749 | { | |
3b529a76 | 750 | /* clear out temporary/transitional state from the context */ |
de62de59 | 751 | aa_clear_task_ctx_trans(task_ctx(current)); |
3b529a76 | 752 | |
fe864821 JJ |
753 | return; |
754 | } | |
755 | ||
6326948f PM |
756 | static void apparmor_current_getsecid_subj(u32 *secid) |
757 | { | |
758 | struct aa_label *label = aa_get_current_label(); | |
759 | *secid = label->secid; | |
760 | aa_put_label(label); | |
761 | } | |
762 | ||
763 | static void apparmor_task_getsecid_obj(struct task_struct *p, u32 *secid) | |
a7ae3645 JJ |
764 | { |
765 | struct aa_label *label = aa_get_task_label(p); | |
766 | *secid = label->secid; | |
767 | aa_put_label(label); | |
768 | } | |
769 | ||
7cb4dc9f JS |
770 | static int apparmor_task_setrlimit(struct task_struct *task, |
771 | unsigned int resource, struct rlimit *new_rlim) | |
b5e95b48 | 772 | { |
637f688d | 773 | struct aa_label *label = __begin_current_label_crit_section(); |
b5e95b48 JJ |
774 | int error = 0; |
775 | ||
637f688d | 776 | if (!unconfined(label)) |
86b92cb7 | 777 | error = aa_task_setrlimit(label, task, resource, new_rlim); |
637f688d | 778 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
779 | |
780 | return error; | |
781 | } | |
782 | ||
ae7795bc | 783 | static int apparmor_task_kill(struct task_struct *target, struct kernel_siginfo *info, |
6b4f3d01 | 784 | int sig, const struct cred *cred) |
cd1dbf76 JJ |
785 | { |
786 | struct aa_label *cl, *tl; | |
787 | int error; | |
788 | ||
6b4f3d01 SS |
789 | if (cred) { |
790 | /* | |
791 | * Dealing with USB IO specific behavior | |
cd1dbf76 | 792 | */ |
6b4f3d01 SS |
793 | cl = aa_get_newest_cred_label(cred); |
794 | tl = aa_get_task_label(target); | |
795 | error = aa_may_signal(cl, tl, sig); | |
796 | aa_put_label(cl); | |
797 | aa_put_label(tl); | |
798 | return error; | |
799 | } | |
800 | ||
cd1dbf76 JJ |
801 | cl = __begin_current_label_crit_section(); |
802 | tl = aa_get_task_label(target); | |
803 | error = aa_may_signal(cl, tl, sig); | |
804 | aa_put_label(tl); | |
805 | __end_current_label_crit_section(cl); | |
806 | ||
807 | return error; | |
808 | } | |
809 | ||
56974a6f JJ |
810 | /** |
811 | * apparmor_sk_alloc_security - allocate and attach the sk_security field | |
812 | */ | |
813 | static int apparmor_sk_alloc_security(struct sock *sk, int family, gfp_t flags) | |
814 | { | |
815 | struct aa_sk_ctx *ctx; | |
816 | ||
817 | ctx = kzalloc(sizeof(*ctx), flags); | |
818 | if (!ctx) | |
819 | return -ENOMEM; | |
820 | ||
821 | SK_CTX(sk) = ctx; | |
822 | ||
823 | return 0; | |
824 | } | |
825 | ||
826 | /** | |
827 | * apparmor_sk_free_security - free the sk_security field | |
828 | */ | |
829 | static void apparmor_sk_free_security(struct sock *sk) | |
830 | { | |
831 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
832 | ||
833 | SK_CTX(sk) = NULL; | |
834 | aa_put_label(ctx->label); | |
835 | aa_put_label(ctx->peer); | |
836 | kfree(ctx); | |
837 | } | |
838 | ||
839 | /** | |
0fc6ab40 | 840 | * apparmor_sk_clone_security - clone the sk_security field |
56974a6f JJ |
841 | */ |
842 | static void apparmor_sk_clone_security(const struct sock *sk, | |
843 | struct sock *newsk) | |
844 | { | |
845 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
846 | struct aa_sk_ctx *new = SK_CTX(newsk); | |
847 | ||
3b646abc MFO |
848 | if (new->label) |
849 | aa_put_label(new->label); | |
56974a6f | 850 | new->label = aa_get_label(ctx->label); |
3b646abc MFO |
851 | |
852 | if (new->peer) | |
853 | aa_put_label(new->peer); | |
56974a6f JJ |
854 | new->peer = aa_get_label(ctx->peer); |
855 | } | |
856 | ||
857 | /** | |
858 | * apparmor_socket_create - check perms before creating a new socket | |
859 | */ | |
860 | static int apparmor_socket_create(int family, int type, int protocol, int kern) | |
861 | { | |
862 | struct aa_label *label; | |
863 | int error = 0; | |
864 | ||
865 | AA_BUG(in_interrupt()); | |
866 | ||
867 | label = begin_current_label_crit_section(); | |
868 | if (!(kern || unconfined(label))) | |
869 | error = af_select(family, | |
870 | create_perm(label, family, type, protocol), | |
871 | aa_af_perm(label, OP_CREATE, AA_MAY_CREATE, | |
872 | family, type, protocol)); | |
873 | end_current_label_crit_section(label); | |
874 | ||
875 | return error; | |
876 | } | |
877 | ||
878 | /** | |
879 | * apparmor_socket_post_create - setup the per-socket security struct | |
880 | * | |
881 | * Note: | |
882 | * - kernel sockets currently labeled unconfined but we may want to | |
883 | * move to a special kernel label | |
884 | * - socket may not have sk here if created with sock_create_lite or | |
885 | * sock_alloc. These should be accept cases which will be handled in | |
886 | * sock_graft. | |
887 | */ | |
888 | static int apparmor_socket_post_create(struct socket *sock, int family, | |
889 | int type, int protocol, int kern) | |
890 | { | |
891 | struct aa_label *label; | |
892 | ||
893 | if (kern) { | |
95c0581f | 894 | label = aa_get_label(kernel_t); |
56974a6f JJ |
895 | } else |
896 | label = aa_get_current_label(); | |
897 | ||
898 | if (sock->sk) { | |
899 | struct aa_sk_ctx *ctx = SK_CTX(sock->sk); | |
900 | ||
901 | aa_put_label(ctx->label); | |
902 | ctx->label = aa_get_label(label); | |
903 | } | |
904 | aa_put_label(label); | |
905 | ||
906 | return 0; | |
907 | } | |
908 | ||
909 | /** | |
910 | * apparmor_socket_bind - check perms before bind addr to socket | |
911 | */ | |
912 | static int apparmor_socket_bind(struct socket *sock, | |
913 | struct sockaddr *address, int addrlen) | |
914 | { | |
915 | AA_BUG(!sock); | |
916 | AA_BUG(!sock->sk); | |
917 | AA_BUG(!address); | |
918 | AA_BUG(in_interrupt()); | |
919 | ||
920 | return af_select(sock->sk->sk_family, | |
921 | bind_perm(sock, address, addrlen), | |
922 | aa_sk_perm(OP_BIND, AA_MAY_BIND, sock->sk)); | |
923 | } | |
924 | ||
925 | /** | |
926 | * apparmor_socket_connect - check perms before connecting @sock to @address | |
927 | */ | |
928 | static int apparmor_socket_connect(struct socket *sock, | |
929 | struct sockaddr *address, int addrlen) | |
930 | { | |
931 | AA_BUG(!sock); | |
932 | AA_BUG(!sock->sk); | |
933 | AA_BUG(!address); | |
934 | AA_BUG(in_interrupt()); | |
935 | ||
936 | return af_select(sock->sk->sk_family, | |
937 | connect_perm(sock, address, addrlen), | |
938 | aa_sk_perm(OP_CONNECT, AA_MAY_CONNECT, sock->sk)); | |
939 | } | |
940 | ||
941 | /** | |
0fc6ab40 | 942 | * apparmor_socket_listen - check perms before allowing listen |
56974a6f JJ |
943 | */ |
944 | static int apparmor_socket_listen(struct socket *sock, int backlog) | |
945 | { | |
946 | AA_BUG(!sock); | |
947 | AA_BUG(!sock->sk); | |
948 | AA_BUG(in_interrupt()); | |
949 | ||
950 | return af_select(sock->sk->sk_family, | |
951 | listen_perm(sock, backlog), | |
952 | aa_sk_perm(OP_LISTEN, AA_MAY_LISTEN, sock->sk)); | |
953 | } | |
954 | ||
955 | /** | |
956 | * apparmor_socket_accept - check perms before accepting a new connection. | |
957 | * | |
958 | * Note: while @newsock is created and has some information, the accept | |
959 | * has not been done. | |
960 | */ | |
961 | static int apparmor_socket_accept(struct socket *sock, struct socket *newsock) | |
962 | { | |
963 | AA_BUG(!sock); | |
964 | AA_BUG(!sock->sk); | |
965 | AA_BUG(!newsock); | |
966 | AA_BUG(in_interrupt()); | |
967 | ||
968 | return af_select(sock->sk->sk_family, | |
969 | accept_perm(sock, newsock), | |
970 | aa_sk_perm(OP_ACCEPT, AA_MAY_ACCEPT, sock->sk)); | |
971 | } | |
972 | ||
973 | static int aa_sock_msg_perm(const char *op, u32 request, struct socket *sock, | |
974 | struct msghdr *msg, int size) | |
975 | { | |
976 | AA_BUG(!sock); | |
977 | AA_BUG(!sock->sk); | |
978 | AA_BUG(!msg); | |
979 | AA_BUG(in_interrupt()); | |
980 | ||
981 | return af_select(sock->sk->sk_family, | |
982 | msg_perm(op, request, sock, msg, size), | |
983 | aa_sk_perm(op, request, sock->sk)); | |
984 | } | |
985 | ||
986 | /** | |
987 | * apparmor_socket_sendmsg - check perms before sending msg to another socket | |
988 | */ | |
989 | static int apparmor_socket_sendmsg(struct socket *sock, | |
990 | struct msghdr *msg, int size) | |
991 | { | |
992 | return aa_sock_msg_perm(OP_SENDMSG, AA_MAY_SEND, sock, msg, size); | |
993 | } | |
994 | ||
995 | /** | |
996 | * apparmor_socket_recvmsg - check perms before receiving a message | |
997 | */ | |
998 | static int apparmor_socket_recvmsg(struct socket *sock, | |
999 | struct msghdr *msg, int size, int flags) | |
1000 | { | |
1001 | return aa_sock_msg_perm(OP_RECVMSG, AA_MAY_RECEIVE, sock, msg, size); | |
1002 | } | |
1003 | ||
1004 | /* revaliation, get/set attr, shutdown */ | |
1005 | static int aa_sock_perm(const char *op, u32 request, struct socket *sock) | |
1006 | { | |
1007 | AA_BUG(!sock); | |
1008 | AA_BUG(!sock->sk); | |
1009 | AA_BUG(in_interrupt()); | |
1010 | ||
1011 | return af_select(sock->sk->sk_family, | |
1012 | sock_perm(op, request, sock), | |
1013 | aa_sk_perm(op, request, sock->sk)); | |
1014 | } | |
1015 | ||
1016 | /** | |
1017 | * apparmor_socket_getsockname - check perms before getting the local address | |
1018 | */ | |
1019 | static int apparmor_socket_getsockname(struct socket *sock) | |
1020 | { | |
1021 | return aa_sock_perm(OP_GETSOCKNAME, AA_MAY_GETATTR, sock); | |
1022 | } | |
1023 | ||
1024 | /** | |
1025 | * apparmor_socket_getpeername - check perms before getting remote address | |
1026 | */ | |
1027 | static int apparmor_socket_getpeername(struct socket *sock) | |
1028 | { | |
1029 | return aa_sock_perm(OP_GETPEERNAME, AA_MAY_GETATTR, sock); | |
1030 | } | |
1031 | ||
1032 | /* revaliation, get/set attr, opt */ | |
1033 | static int aa_sock_opt_perm(const char *op, u32 request, struct socket *sock, | |
1034 | int level, int optname) | |
1035 | { | |
1036 | AA_BUG(!sock); | |
1037 | AA_BUG(!sock->sk); | |
1038 | AA_BUG(in_interrupt()); | |
1039 | ||
1040 | return af_select(sock->sk->sk_family, | |
1041 | opt_perm(op, request, sock, level, optname), | |
1042 | aa_sk_perm(op, request, sock->sk)); | |
1043 | } | |
1044 | ||
1045 | /** | |
0fc6ab40 | 1046 | * apparmor_socket_getsockopt - check perms before getting socket options |
56974a6f JJ |
1047 | */ |
1048 | static int apparmor_socket_getsockopt(struct socket *sock, int level, | |
1049 | int optname) | |
1050 | { | |
1051 | return aa_sock_opt_perm(OP_GETSOCKOPT, AA_MAY_GETOPT, sock, | |
1052 | level, optname); | |
1053 | } | |
1054 | ||
1055 | /** | |
0fc6ab40 | 1056 | * apparmor_socket_setsockopt - check perms before setting socket options |
56974a6f JJ |
1057 | */ |
1058 | static int apparmor_socket_setsockopt(struct socket *sock, int level, | |
1059 | int optname) | |
1060 | { | |
1061 | return aa_sock_opt_perm(OP_SETSOCKOPT, AA_MAY_SETOPT, sock, | |
1062 | level, optname); | |
1063 | } | |
1064 | ||
1065 | /** | |
1066 | * apparmor_socket_shutdown - check perms before shutting down @sock conn | |
1067 | */ | |
1068 | static int apparmor_socket_shutdown(struct socket *sock, int how) | |
1069 | { | |
1070 | return aa_sock_perm(OP_SHUTDOWN, AA_MAY_SHUTDOWN, sock); | |
1071 | } | |
1072 | ||
e1af4779 | 1073 | #ifdef CONFIG_NETWORK_SECMARK |
56974a6f | 1074 | /** |
0fc6ab40 | 1075 | * apparmor_socket_sock_rcv_skb - check perms before associating skb to sk |
56974a6f JJ |
1076 | * |
1077 | * Note: can not sleep may be called with locks held | |
1078 | * | |
1079 | * dont want protocol specific in __skb_recv_datagram() | |
1080 | * to deny an incoming connection socket_sock_rcv_skb() | |
1081 | */ | |
1082 | static int apparmor_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
1083 | { | |
ab9f2115 MG |
1084 | struct aa_sk_ctx *ctx = SK_CTX(sk); |
1085 | ||
1086 | if (!skb->secmark) | |
1087 | return 0; | |
1088 | ||
1089 | return apparmor_secmark_check(ctx->label, OP_RECVMSG, AA_MAY_RECEIVE, | |
1090 | skb->secmark, sk); | |
56974a6f | 1091 | } |
e1af4779 | 1092 | #endif |
56974a6f JJ |
1093 | |
1094 | ||
1095 | static struct aa_label *sk_peer_label(struct sock *sk) | |
1096 | { | |
1097 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
1098 | ||
1099 | if (ctx->peer) | |
1100 | return ctx->peer; | |
1101 | ||
1102 | return ERR_PTR(-ENOPROTOOPT); | |
1103 | } | |
1104 | ||
1105 | /** | |
1106 | * apparmor_socket_getpeersec_stream - get security context of peer | |
1107 | * | |
1108 | * Note: for tcp only valid if using ipsec or cipso on lan | |
1109 | */ | |
1110 | static int apparmor_socket_getpeersec_stream(struct socket *sock, | |
1111 | char __user *optval, | |
1112 | int __user *optlen, | |
1113 | unsigned int len) | |
1114 | { | |
1115 | char *name; | |
1116 | int slen, error = 0; | |
1117 | struct aa_label *label; | |
1118 | struct aa_label *peer; | |
1119 | ||
1120 | label = begin_current_label_crit_section(); | |
1121 | peer = sk_peer_label(sock->sk); | |
1122 | if (IS_ERR(peer)) { | |
1123 | error = PTR_ERR(peer); | |
1124 | goto done; | |
1125 | } | |
1126 | slen = aa_label_asxprint(&name, labels_ns(label), peer, | |
1127 | FLAG_SHOW_MODE | FLAG_VIEW_SUBNS | | |
1128 | FLAG_HIDDEN_UNCONFINED, GFP_KERNEL); | |
1129 | /* don't include terminating \0 in slen, it breaks some apps */ | |
1130 | if (slen < 0) { | |
1131 | error = -ENOMEM; | |
1132 | } else { | |
1133 | if (slen > len) { | |
1134 | error = -ERANGE; | |
1135 | } else if (copy_to_user(optval, name, slen)) { | |
1136 | error = -EFAULT; | |
1137 | goto out; | |
1138 | } | |
1139 | if (put_user(slen, optlen)) | |
1140 | error = -EFAULT; | |
1141 | out: | |
1142 | kfree(name); | |
1143 | ||
1144 | } | |
1145 | ||
1146 | done: | |
1147 | end_current_label_crit_section(label); | |
1148 | ||
1149 | return error; | |
1150 | } | |
1151 | ||
1152 | /** | |
1153 | * apparmor_socket_getpeersec_dgram - get security label of packet | |
1154 | * @sock: the peer socket | |
1155 | * @skb: packet data | |
1156 | * @secid: pointer to where to put the secid of the packet | |
1157 | * | |
1158 | * Sets the netlabel socket state on sk from parent | |
1159 | */ | |
1160 | static int apparmor_socket_getpeersec_dgram(struct socket *sock, | |
1161 | struct sk_buff *skb, u32 *secid) | |
1162 | ||
1163 | { | |
1164 | /* TODO: requires secid support */ | |
1165 | return -ENOPROTOOPT; | |
1166 | } | |
1167 | ||
1168 | /** | |
1169 | * apparmor_sock_graft - Initialize newly created socket | |
1170 | * @sk: child sock | |
1171 | * @parent: parent socket | |
1172 | * | |
1173 | * Note: could set off of SOCK_CTX(parent) but need to track inode and we can | |
1174 | * just set sk security information off of current creating process label | |
1175 | * Labeling of sk for accept case - probably should be sock based | |
1176 | * instead of task, because of the case where an implicitly labeled | |
1177 | * socket is shared by different tasks. | |
1178 | */ | |
1179 | static void apparmor_sock_graft(struct sock *sk, struct socket *parent) | |
1180 | { | |
1181 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
1182 | ||
1183 | if (!ctx->label) | |
1184 | ctx->label = aa_get_current_label(); | |
1185 | } | |
1186 | ||
e1af4779 | 1187 | #ifdef CONFIG_NETWORK_SECMARK |
41dd9596 | 1188 | static int apparmor_inet_conn_request(const struct sock *sk, struct sk_buff *skb, |
ab9f2115 MG |
1189 | struct request_sock *req) |
1190 | { | |
1191 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
1192 | ||
1193 | if (!skb->secmark) | |
1194 | return 0; | |
1195 | ||
1196 | return apparmor_secmark_check(ctx->label, OP_CONNECT, AA_MAY_CONNECT, | |
1197 | skb->secmark, sk); | |
1198 | } | |
e1af4779 | 1199 | #endif |
ab9f2115 | 1200 | |
bbd3662a CS |
1201 | /* |
1202 | * The cred blob is a pointer to, not an instance of, an aa_task_ctx. | |
1203 | */ | |
1204 | struct lsm_blob_sizes apparmor_blob_sizes __lsm_ro_after_init = { | |
1205 | .lbs_cred = sizeof(struct aa_task_ctx *), | |
33bf60ca | 1206 | .lbs_file = sizeof(struct aa_file_ctx), |
f4ad8f2c | 1207 | .lbs_task = sizeof(struct aa_task_ctx), |
bbd3662a CS |
1208 | }; |
1209 | ||
ca97d939 | 1210 | static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = { |
e20b043a CS |
1211 | LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check), |
1212 | LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme), | |
1213 | LSM_HOOK_INIT(capget, apparmor_capget), | |
1214 | LSM_HOOK_INIT(capable, apparmor_capable), | |
1215 | ||
2ea3ffb7 JJ |
1216 | LSM_HOOK_INIT(sb_mount, apparmor_sb_mount), |
1217 | LSM_HOOK_INIT(sb_umount, apparmor_sb_umount), | |
1218 | LSM_HOOK_INIT(sb_pivotroot, apparmor_sb_pivotroot), | |
1219 | ||
e20b043a CS |
1220 | LSM_HOOK_INIT(path_link, apparmor_path_link), |
1221 | LSM_HOOK_INIT(path_unlink, apparmor_path_unlink), | |
1222 | LSM_HOOK_INIT(path_symlink, apparmor_path_symlink), | |
1223 | LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir), | |
1224 | LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir), | |
1225 | LSM_HOOK_INIT(path_mknod, apparmor_path_mknod), | |
1226 | LSM_HOOK_INIT(path_rename, apparmor_path_rename), | |
1227 | LSM_HOOK_INIT(path_chmod, apparmor_path_chmod), | |
1228 | LSM_HOOK_INIT(path_chown, apparmor_path_chown), | |
1229 | LSM_HOOK_INIT(path_truncate, apparmor_path_truncate), | |
1230 | LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr), | |
1231 | ||
1232 | LSM_HOOK_INIT(file_open, apparmor_file_open), | |
064dc947 | 1233 | LSM_HOOK_INIT(file_receive, apparmor_file_receive), |
e20b043a CS |
1234 | LSM_HOOK_INIT(file_permission, apparmor_file_permission), |
1235 | LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security), | |
1236 | LSM_HOOK_INIT(file_free_security, apparmor_file_free_security), | |
1237 | LSM_HOOK_INIT(mmap_file, apparmor_mmap_file), | |
e20b043a CS |
1238 | LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect), |
1239 | LSM_HOOK_INIT(file_lock, apparmor_file_lock), | |
3350607d | 1240 | LSM_HOOK_INIT(file_truncate, apparmor_file_truncate), |
e20b043a CS |
1241 | |
1242 | LSM_HOOK_INIT(getprocattr, apparmor_getprocattr), | |
1243 | LSM_HOOK_INIT(setprocattr, apparmor_setprocattr), | |
1244 | ||
56974a6f JJ |
1245 | LSM_HOOK_INIT(sk_alloc_security, apparmor_sk_alloc_security), |
1246 | LSM_HOOK_INIT(sk_free_security, apparmor_sk_free_security), | |
1247 | LSM_HOOK_INIT(sk_clone_security, apparmor_sk_clone_security), | |
1248 | ||
1249 | LSM_HOOK_INIT(socket_create, apparmor_socket_create), | |
1250 | LSM_HOOK_INIT(socket_post_create, apparmor_socket_post_create), | |
1251 | LSM_HOOK_INIT(socket_bind, apparmor_socket_bind), | |
1252 | LSM_HOOK_INIT(socket_connect, apparmor_socket_connect), | |
1253 | LSM_HOOK_INIT(socket_listen, apparmor_socket_listen), | |
1254 | LSM_HOOK_INIT(socket_accept, apparmor_socket_accept), | |
1255 | LSM_HOOK_INIT(socket_sendmsg, apparmor_socket_sendmsg), | |
1256 | LSM_HOOK_INIT(socket_recvmsg, apparmor_socket_recvmsg), | |
1257 | LSM_HOOK_INIT(socket_getsockname, apparmor_socket_getsockname), | |
1258 | LSM_HOOK_INIT(socket_getpeername, apparmor_socket_getpeername), | |
1259 | LSM_HOOK_INIT(socket_getsockopt, apparmor_socket_getsockopt), | |
1260 | LSM_HOOK_INIT(socket_setsockopt, apparmor_socket_setsockopt), | |
1261 | LSM_HOOK_INIT(socket_shutdown, apparmor_socket_shutdown), | |
e1af4779 | 1262 | #ifdef CONFIG_NETWORK_SECMARK |
56974a6f | 1263 | LSM_HOOK_INIT(socket_sock_rcv_skb, apparmor_socket_sock_rcv_skb), |
e1af4779 | 1264 | #endif |
56974a6f JJ |
1265 | LSM_HOOK_INIT(socket_getpeersec_stream, |
1266 | apparmor_socket_getpeersec_stream), | |
1267 | LSM_HOOK_INIT(socket_getpeersec_dgram, | |
1268 | apparmor_socket_getpeersec_dgram), | |
1269 | LSM_HOOK_INIT(sock_graft, apparmor_sock_graft), | |
e1af4779 | 1270 | #ifdef CONFIG_NETWORK_SECMARK |
ab9f2115 | 1271 | LSM_HOOK_INIT(inet_conn_request, apparmor_inet_conn_request), |
e1af4779 | 1272 | #endif |
56974a6f | 1273 | |
e20b043a CS |
1274 | LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank), |
1275 | LSM_HOOK_INIT(cred_free, apparmor_cred_free), | |
1276 | LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare), | |
1277 | LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer), | |
1278 | ||
b8bff599 | 1279 | LSM_HOOK_INIT(bprm_creds_for_exec, apparmor_bprm_creds_for_exec), |
e20b043a CS |
1280 | LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds), |
1281 | LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds), | |
e20b043a | 1282 | |
3b529a76 JJ |
1283 | LSM_HOOK_INIT(task_free, apparmor_task_free), |
1284 | LSM_HOOK_INIT(task_alloc, apparmor_task_alloc), | |
6326948f PM |
1285 | LSM_HOOK_INIT(current_getsecid_subj, apparmor_current_getsecid_subj), |
1286 | LSM_HOOK_INIT(task_getsecid_obj, apparmor_task_getsecid_obj), | |
e20b043a | 1287 | LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit), |
cd1dbf76 | 1288 | LSM_HOOK_INIT(task_kill, apparmor_task_kill), |
c0929212 | 1289 | |
e79c26d0 MG |
1290 | #ifdef CONFIG_AUDIT |
1291 | LSM_HOOK_INIT(audit_rule_init, aa_audit_rule_init), | |
1292 | LSM_HOOK_INIT(audit_rule_known, aa_audit_rule_known), | |
1293 | LSM_HOOK_INIT(audit_rule_match, aa_audit_rule_match), | |
1294 | LSM_HOOK_INIT(audit_rule_free, aa_audit_rule_free), | |
1295 | #endif | |
1296 | ||
c0929212 JJ |
1297 | LSM_HOOK_INIT(secid_to_secctx, apparmor_secid_to_secctx), |
1298 | LSM_HOOK_INIT(secctx_to_secid, apparmor_secctx_to_secid), | |
1299 | LSM_HOOK_INIT(release_secctx, apparmor_release_secctx), | |
b5e95b48 JJ |
1300 | }; |
1301 | ||
1302 | /* | |
1303 | * AppArmor sysfs module parameters | |
1304 | */ | |
1305 | ||
101d6c82 SR |
1306 | static int param_set_aabool(const char *val, const struct kernel_param *kp); |
1307 | static int param_get_aabool(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 1308 | #define param_check_aabool param_check_bool |
9c27847d | 1309 | static const struct kernel_param_ops param_ops_aabool = { |
6a4c2643 | 1310 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
1311 | .set = param_set_aabool, |
1312 | .get = param_get_aabool | |
1313 | }; | |
b5e95b48 | 1314 | |
101d6c82 SR |
1315 | static int param_set_aauint(const char *val, const struct kernel_param *kp); |
1316 | static int param_get_aauint(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 1317 | #define param_check_aauint param_check_uint |
9c27847d | 1318 | static const struct kernel_param_ops param_ops_aauint = { |
101d6c82 SR |
1319 | .set = param_set_aauint, |
1320 | .get = param_get_aauint | |
1321 | }; | |
b5e95b48 | 1322 | |
63c16c3a CC |
1323 | static int param_set_aacompressionlevel(const char *val, |
1324 | const struct kernel_param *kp); | |
1325 | static int param_get_aacompressionlevel(char *buffer, | |
1326 | const struct kernel_param *kp); | |
1327 | #define param_check_aacompressionlevel param_check_int | |
1328 | static const struct kernel_param_ops param_ops_aacompressionlevel = { | |
1329 | .set = param_set_aacompressionlevel, | |
1330 | .get = param_get_aacompressionlevel | |
1331 | }; | |
1332 | ||
101d6c82 SR |
1333 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp); |
1334 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 1335 | #define param_check_aalockpolicy param_check_bool |
9c27847d | 1336 | static const struct kernel_param_ops param_ops_aalockpolicy = { |
6a4c2643 | 1337 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
1338 | .set = param_set_aalockpolicy, |
1339 | .get = param_get_aalockpolicy | |
1340 | }; | |
b5e95b48 | 1341 | |
e4dca7b7 KC |
1342 | static int param_set_audit(const char *val, const struct kernel_param *kp); |
1343 | static int param_get_audit(char *buffer, const struct kernel_param *kp); | |
b5e95b48 | 1344 | |
e4dca7b7 KC |
1345 | static int param_set_mode(const char *val, const struct kernel_param *kp); |
1346 | static int param_get_mode(char *buffer, const struct kernel_param *kp); | |
b5e95b48 JJ |
1347 | |
1348 | /* Flag values, also controllable via /sys/module/apparmor/parameters | |
1349 | * We define special types as we want to do additional mediation. | |
1350 | */ | |
1351 | ||
1352 | /* AppArmor global enforcement switch - complain, enforce, kill */ | |
1353 | enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE; | |
1354 | module_param_call(mode, param_set_mode, param_get_mode, | |
1355 | &aa_g_profile_mode, S_IRUSR | S_IWUSR); | |
1356 | ||
6059f71f | 1357 | /* whether policy verification hashing is enabled */ |
7616ac70 | 1358 | bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT); |
3ccb76c5 | 1359 | #ifdef CONFIG_SECURITY_APPARMOR_HASH |
6059f71f | 1360 | module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR); |
7616ac70 | 1361 | #endif |
6059f71f | 1362 | |
d61c57fd JJ |
1363 | /* whether policy exactly as loaded is retained for debug and checkpointing */ |
1364 | bool aa_g_export_binary = IS_ENABLED(CONFIG_SECURITY_APPARMOR_EXPORT_BINARY); | |
1365 | #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY | |
1366 | module_param_named(export_binary, aa_g_export_binary, aabool, 0600); | |
1367 | #endif | |
1368 | ||
63c16c3a CC |
1369 | /* policy loaddata compression level */ |
1370 | int aa_g_rawdata_compression_level = Z_DEFAULT_COMPRESSION; | |
1371 | module_param_named(rawdata_compression_level, aa_g_rawdata_compression_level, | |
1372 | aacompressionlevel, 0400); | |
1373 | ||
b5e95b48 | 1374 | /* Debug mode */ |
eea7a05f | 1375 | bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_APPARMOR_DEBUG_MESSAGES); |
b5e95b48 JJ |
1376 | module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR); |
1377 | ||
1378 | /* Audit mode */ | |
1379 | enum audit_mode aa_g_audit; | |
1380 | module_param_call(audit, param_set_audit, param_get_audit, | |
1381 | &aa_g_audit, S_IRUSR | S_IWUSR); | |
1382 | ||
1383 | /* Determines if audit header is included in audited messages. This | |
1384 | * provides more context if the audit daemon is not running | |
1385 | */ | |
954317fe | 1386 | bool aa_g_audit_header = true; |
b5e95b48 JJ |
1387 | module_param_named(audit_header, aa_g_audit_header, aabool, |
1388 | S_IRUSR | S_IWUSR); | |
1389 | ||
1390 | /* lock out loading/removal of policy | |
1391 | * TODO: add in at boot loading of policy, which is the only way to | |
1392 | * load policy, if lock_policy is set | |
1393 | */ | |
90ab5ee9 | 1394 | bool aa_g_lock_policy; |
b5e95b48 JJ |
1395 | module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy, |
1396 | S_IRUSR | S_IWUSR); | |
1397 | ||
1398 | /* Syscall logging mode */ | |
90ab5ee9 | 1399 | bool aa_g_logsyscall; |
b5e95b48 JJ |
1400 | module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR); |
1401 | ||
1402 | /* Maximum pathname length before accesses will start getting rejected */ | |
1403 | unsigned int aa_g_path_max = 2 * PATH_MAX; | |
622f6e32 | 1404 | module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR); |
b5e95b48 JJ |
1405 | |
1406 | /* Determines how paranoid loading of policy is and how much verification | |
1407 | * on the loaded policy is done. | |
abbf8734 JJ |
1408 | * DEPRECATED: read only as strict checking of load is always done now |
1409 | * that none root users (user namespaces) can load policy. | |
b5e95b48 | 1410 | */ |
79eb2711 | 1411 | bool aa_g_paranoid_load = IS_ENABLED(CONFIG_SECURITY_APPARMOR_PARANOID_LOAD); |
abbf8734 | 1412 | module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO); |
b5e95b48 | 1413 | |
e33c1b99 KC |
1414 | static int param_get_aaintbool(char *buffer, const struct kernel_param *kp); |
1415 | static int param_set_aaintbool(const char *val, const struct kernel_param *kp); | |
1416 | #define param_check_aaintbool param_check_int | |
1417 | static const struct kernel_param_ops param_ops_aaintbool = { | |
1418 | .set = param_set_aaintbool, | |
1419 | .get = param_get_aaintbool | |
1420 | }; | |
b5e95b48 | 1421 | /* Boot time disable flag */ |
0102fb83 | 1422 | static int apparmor_enabled __lsm_ro_after_init = 1; |
e33c1b99 | 1423 | module_param_named(enabled, apparmor_enabled, aaintbool, 0444); |
b5e95b48 JJ |
1424 | |
1425 | static int __init apparmor_enabled_setup(char *str) | |
1426 | { | |
1427 | unsigned long enabled; | |
29707b20 | 1428 | int error = kstrtoul(str, 0, &enabled); |
b5e95b48 JJ |
1429 | if (!error) |
1430 | apparmor_enabled = enabled ? 1 : 0; | |
1431 | return 1; | |
1432 | } | |
1433 | ||
1434 | __setup("apparmor=", apparmor_enabled_setup); | |
1435 | ||
1436 | /* set global flag turning off the ability to load policy */ | |
101d6c82 | 1437 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp) |
b5e95b48 | 1438 | { |
545de8fe JJ |
1439 | if (!apparmor_enabled) |
1440 | return -EINVAL; | |
92de220a | 1441 | if (apparmor_initialized && !aa_current_policy_admin_capable(NULL)) |
b5e95b48 | 1442 | return -EPERM; |
b5e95b48 JJ |
1443 | return param_set_bool(val, kp); |
1444 | } | |
1445 | ||
101d6c82 | 1446 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1447 | { |
ca4bd5ae JJ |
1448 | if (!apparmor_enabled) |
1449 | return -EINVAL; | |
92de220a | 1450 | if (apparmor_initialized && !aa_current_policy_view_capable(NULL)) |
545de8fe | 1451 | return -EPERM; |
b5e95b48 JJ |
1452 | return param_get_bool(buffer, kp); |
1453 | } | |
1454 | ||
101d6c82 | 1455 | static int param_set_aabool(const char *val, const struct kernel_param *kp) |
b5e95b48 | 1456 | { |
ca4bd5ae JJ |
1457 | if (!apparmor_enabled) |
1458 | return -EINVAL; | |
92de220a | 1459 | if (apparmor_initialized && !aa_current_policy_admin_capable(NULL)) |
545de8fe | 1460 | return -EPERM; |
b5e95b48 JJ |
1461 | return param_set_bool(val, kp); |
1462 | } | |
1463 | ||
101d6c82 | 1464 | static int param_get_aabool(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1465 | { |
ca4bd5ae JJ |
1466 | if (!apparmor_enabled) |
1467 | return -EINVAL; | |
92de220a | 1468 | if (apparmor_initialized && !aa_current_policy_view_capable(NULL)) |
545de8fe | 1469 | return -EPERM; |
b5e95b48 JJ |
1470 | return param_get_bool(buffer, kp); |
1471 | } | |
1472 | ||
101d6c82 | 1473 | static int param_set_aauint(const char *val, const struct kernel_param *kp) |
b5e95b48 | 1474 | { |
39d84824 JJ |
1475 | int error; |
1476 | ||
ca4bd5ae JJ |
1477 | if (!apparmor_enabled) |
1478 | return -EINVAL; | |
39d84824 JJ |
1479 | /* file is ro but enforce 2nd line check */ |
1480 | if (apparmor_initialized) | |
545de8fe | 1481 | return -EPERM; |
39d84824 JJ |
1482 | |
1483 | error = param_set_uint(val, kp); | |
df323337 | 1484 | aa_g_path_max = max_t(uint32_t, aa_g_path_max, sizeof(union aa_buffer)); |
39d84824 JJ |
1485 | pr_info("AppArmor: buffer size set to %d bytes\n", aa_g_path_max); |
1486 | ||
1487 | return error; | |
b5e95b48 JJ |
1488 | } |
1489 | ||
101d6c82 | 1490 | static int param_get_aauint(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1491 | { |
ca4bd5ae JJ |
1492 | if (!apparmor_enabled) |
1493 | return -EINVAL; | |
92de220a | 1494 | if (apparmor_initialized && !aa_current_policy_view_capable(NULL)) |
545de8fe | 1495 | return -EPERM; |
b5e95b48 JJ |
1496 | return param_get_uint(buffer, kp); |
1497 | } | |
1498 | ||
e33c1b99 KC |
1499 | /* Can only be set before AppArmor is initialized (i.e. on boot cmdline). */ |
1500 | static int param_set_aaintbool(const char *val, const struct kernel_param *kp) | |
1501 | { | |
1502 | struct kernel_param kp_local; | |
1503 | bool value; | |
1504 | int error; | |
1505 | ||
1506 | if (apparmor_initialized) | |
1507 | return -EPERM; | |
1508 | ||
1509 | /* Create local copy, with arg pointing to bool type. */ | |
1510 | value = !!*((int *)kp->arg); | |
1511 | memcpy(&kp_local, kp, sizeof(kp_local)); | |
1512 | kp_local.arg = &value; | |
1513 | ||
1514 | error = param_set_bool(val, &kp_local); | |
1515 | if (!error) | |
1516 | *((int *)kp->arg) = *((bool *)kp_local.arg); | |
1517 | return error; | |
1518 | } | |
1519 | ||
1520 | /* | |
1521 | * To avoid changing /sys/module/apparmor/parameters/enabled from Y/N to | |
1522 | * 1/0, this converts the "int that is actually bool" back to bool for | |
1523 | * display in the /sys filesystem, while keeping it "int" for the LSM | |
1524 | * infrastructure. | |
1525 | */ | |
1526 | static int param_get_aaintbool(char *buffer, const struct kernel_param *kp) | |
1527 | { | |
1528 | struct kernel_param kp_local; | |
1529 | bool value; | |
1530 | ||
1531 | /* Create local copy, with arg pointing to bool type. */ | |
1532 | value = !!*((int *)kp->arg); | |
1533 | memcpy(&kp_local, kp, sizeof(kp_local)); | |
1534 | kp_local.arg = &value; | |
1535 | ||
1536 | return param_get_bool(buffer, &kp_local); | |
1537 | } | |
1538 | ||
63c16c3a CC |
1539 | static int param_set_aacompressionlevel(const char *val, |
1540 | const struct kernel_param *kp) | |
1541 | { | |
1542 | int error; | |
1543 | ||
1544 | if (!apparmor_enabled) | |
1545 | return -EINVAL; | |
1546 | if (apparmor_initialized) | |
1547 | return -EPERM; | |
1548 | ||
1549 | error = param_set_int(val, kp); | |
1550 | ||
1551 | aa_g_rawdata_compression_level = clamp(aa_g_rawdata_compression_level, | |
1552 | Z_NO_COMPRESSION, | |
1553 | Z_BEST_COMPRESSION); | |
1554 | pr_info("AppArmor: policy rawdata compression level set to %u\n", | |
1555 | aa_g_rawdata_compression_level); | |
1556 | ||
1557 | return error; | |
1558 | } | |
1559 | ||
1560 | static int param_get_aacompressionlevel(char *buffer, | |
1561 | const struct kernel_param *kp) | |
1562 | { | |
1563 | if (!apparmor_enabled) | |
1564 | return -EINVAL; | |
92de220a | 1565 | if (apparmor_initialized && !aa_current_policy_view_capable(NULL)) |
63c16c3a CC |
1566 | return -EPERM; |
1567 | return param_get_int(buffer, kp); | |
1568 | } | |
1569 | ||
e4dca7b7 | 1570 | static int param_get_audit(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1571 | { |
b5e95b48 JJ |
1572 | if (!apparmor_enabled) |
1573 | return -EINVAL; | |
92de220a | 1574 | if (apparmor_initialized && !aa_current_policy_view_capable(NULL)) |
545de8fe | 1575 | return -EPERM; |
b5e95b48 JJ |
1576 | return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]); |
1577 | } | |
1578 | ||
e4dca7b7 | 1579 | static int param_set_audit(const char *val, const struct kernel_param *kp) |
b5e95b48 JJ |
1580 | { |
1581 | int i; | |
b5e95b48 JJ |
1582 | |
1583 | if (!apparmor_enabled) | |
1584 | return -EINVAL; | |
b5e95b48 JJ |
1585 | if (!val) |
1586 | return -EINVAL; | |
92de220a | 1587 | if (apparmor_initialized && !aa_current_policy_admin_capable(NULL)) |
545de8fe | 1588 | return -EPERM; |
b5e95b48 | 1589 | |
5d8779a5 AS |
1590 | i = match_string(audit_mode_names, AUDIT_MAX_INDEX, val); |
1591 | if (i < 0) | |
1592 | return -EINVAL; | |
b5e95b48 | 1593 | |
5d8779a5 AS |
1594 | aa_g_audit = i; |
1595 | return 0; | |
b5e95b48 JJ |
1596 | } |
1597 | ||
e4dca7b7 | 1598 | static int param_get_mode(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1599 | { |
b5e95b48 JJ |
1600 | if (!apparmor_enabled) |
1601 | return -EINVAL; | |
92de220a | 1602 | if (apparmor_initialized && !aa_current_policy_view_capable(NULL)) |
545de8fe | 1603 | return -EPERM; |
b5e95b48 | 1604 | |
0d259f04 | 1605 | return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]); |
b5e95b48 JJ |
1606 | } |
1607 | ||
e4dca7b7 | 1608 | static int param_set_mode(const char *val, const struct kernel_param *kp) |
b5e95b48 JJ |
1609 | { |
1610 | int i; | |
b5e95b48 JJ |
1611 | |
1612 | if (!apparmor_enabled) | |
1613 | return -EINVAL; | |
b5e95b48 JJ |
1614 | if (!val) |
1615 | return -EINVAL; | |
92de220a | 1616 | if (apparmor_initialized && !aa_current_policy_admin_capable(NULL)) |
545de8fe | 1617 | return -EPERM; |
b5e95b48 | 1618 | |
5d8779a5 AS |
1619 | i = match_string(aa_profile_mode_names, APPARMOR_MODE_NAMES_MAX_INDEX, |
1620 | val); | |
1621 | if (i < 0) | |
1622 | return -EINVAL; | |
b5e95b48 | 1623 | |
5d8779a5 AS |
1624 | aa_g_profile_mode = i; |
1625 | return 0; | |
b5e95b48 JJ |
1626 | } |
1627 | ||
341c1fda | 1628 | char *aa_get_buffer(bool in_atomic) |
df323337 SAS |
1629 | { |
1630 | union aa_buffer *aa_buf; | |
1631 | bool try_again = true; | |
341c1fda | 1632 | gfp_t flags = (GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN); |
df323337 SAS |
1633 | |
1634 | retry: | |
1635 | spin_lock(&aa_buffers_lock); | |
341c1fda JJ |
1636 | if (buffer_count > reserve_count || |
1637 | (in_atomic && !list_empty(&aa_global_buffers))) { | |
df323337 SAS |
1638 | aa_buf = list_first_entry(&aa_global_buffers, union aa_buffer, |
1639 | list); | |
1640 | list_del(&aa_buf->list); | |
341c1fda | 1641 | buffer_count--; |
df323337 SAS |
1642 | spin_unlock(&aa_buffers_lock); |
1643 | return &aa_buf->buffer[0]; | |
1644 | } | |
341c1fda JJ |
1645 | if (in_atomic) { |
1646 | /* | |
1647 | * out of reserve buffers and in atomic context so increase | |
1648 | * how many buffers to keep in reserve | |
1649 | */ | |
1650 | reserve_count++; | |
1651 | flags = GFP_ATOMIC; | |
1652 | } | |
df323337 SAS |
1653 | spin_unlock(&aa_buffers_lock); |
1654 | ||
341c1fda JJ |
1655 | if (!in_atomic) |
1656 | might_sleep(); | |
1657 | aa_buf = kmalloc(aa_g_path_max, flags); | |
df323337 SAS |
1658 | if (!aa_buf) { |
1659 | if (try_again) { | |
1660 | try_again = false; | |
1661 | goto retry; | |
1662 | } | |
1663 | pr_warn_once("AppArmor: Failed to allocate a memory buffer.\n"); | |
1664 | return NULL; | |
1665 | } | |
1666 | return &aa_buf->buffer[0]; | |
1667 | } | |
1668 | ||
1669 | void aa_put_buffer(char *buf) | |
1670 | { | |
1671 | union aa_buffer *aa_buf; | |
1672 | ||
1673 | if (!buf) | |
1674 | return; | |
1675 | aa_buf = container_of(buf, union aa_buffer, buffer[0]); | |
1676 | ||
1677 | spin_lock(&aa_buffers_lock); | |
1678 | list_add(&aa_buf->list, &aa_global_buffers); | |
341c1fda | 1679 | buffer_count++; |
df323337 SAS |
1680 | spin_unlock(&aa_buffers_lock); |
1681 | } | |
1682 | ||
b5e95b48 JJ |
1683 | /* |
1684 | * AppArmor init functions | |
1685 | */ | |
1686 | ||
1687 | /** | |
55a26ebf | 1688 | * set_init_ctx - set a task context and profile on the first task. |
b5e95b48 JJ |
1689 | * |
1690 | * TODO: allow setting an alternate profile than unconfined | |
1691 | */ | |
55a26ebf | 1692 | static int __init set_init_ctx(void) |
b5e95b48 | 1693 | { |
bf1d2ee7 | 1694 | struct cred *cred = (__force struct cred *)current->real_cred; |
b5e95b48 | 1695 | |
69b5a44a | 1696 | set_cred_label(cred, aa_get_label(ns_unconfined(root_ns))); |
b5e95b48 JJ |
1697 | |
1698 | return 0; | |
1699 | } | |
1700 | ||
d4669f0b JJ |
1701 | static void destroy_buffers(void) |
1702 | { | |
df323337 | 1703 | union aa_buffer *aa_buf; |
d4669f0b | 1704 | |
df323337 SAS |
1705 | spin_lock(&aa_buffers_lock); |
1706 | while (!list_empty(&aa_global_buffers)) { | |
1707 | aa_buf = list_first_entry(&aa_global_buffers, union aa_buffer, | |
1708 | list); | |
1709 | list_del(&aa_buf->list); | |
1710 | spin_unlock(&aa_buffers_lock); | |
1711 | kfree(aa_buf); | |
1712 | spin_lock(&aa_buffers_lock); | |
d4669f0b | 1713 | } |
df323337 | 1714 | spin_unlock(&aa_buffers_lock); |
d4669f0b JJ |
1715 | } |
1716 | ||
1717 | static int __init alloc_buffers(void) | |
1718 | { | |
df323337 SAS |
1719 | union aa_buffer *aa_buf; |
1720 | int i, num; | |
1721 | ||
1722 | /* | |
1723 | * A function may require two buffers at once. Usually the buffers are | |
1724 | * used for a short period of time and are shared. On UP kernel buffers | |
1725 | * two should be enough, with more CPUs it is possible that more | |
1726 | * buffers will be used simultaneously. The preallocated pool may grow. | |
1727 | * This preallocation has also the side-effect that AppArmor will be | |
1728 | * disabled early at boot if aa_g_path_max is extremly high. | |
1729 | */ | |
1730 | if (num_online_cpus() > 1) | |
341c1fda | 1731 | num = 4 + RESERVE_COUNT; |
df323337 | 1732 | else |
341c1fda | 1733 | num = 2 + RESERVE_COUNT; |
df323337 SAS |
1734 | |
1735 | for (i = 0; i < num; i++) { | |
1736 | ||
1737 | aa_buf = kmalloc(aa_g_path_max, GFP_KERNEL | | |
1738 | __GFP_RETRY_MAYFAIL | __GFP_NOWARN); | |
1739 | if (!aa_buf) { | |
1740 | destroy_buffers(); | |
1741 | return -ENOMEM; | |
d4669f0b | 1742 | } |
df323337 | 1743 | aa_put_buffer(&aa_buf->buffer[0]); |
d4669f0b | 1744 | } |
d4669f0b JJ |
1745 | return 0; |
1746 | } | |
1747 | ||
e3ea1ca5 TH |
1748 | #ifdef CONFIG_SYSCTL |
1749 | static int apparmor_dointvec(struct ctl_table *table, int write, | |
32927393 | 1750 | void *buffer, size_t *lenp, loff_t *ppos) |
e3ea1ca5 | 1751 | { |
92de220a | 1752 | if (!aa_current_policy_admin_capable(NULL)) |
e3ea1ca5 TH |
1753 | return -EPERM; |
1754 | if (!apparmor_enabled) | |
1755 | return -EINVAL; | |
1756 | ||
1757 | return proc_dointvec(table, write, buffer, lenp, ppos); | |
1758 | } | |
1759 | ||
1760 | static struct ctl_path apparmor_sysctl_path[] = { | |
1761 | { .procname = "kernel", }, | |
1762 | { } | |
1763 | }; | |
1764 | ||
1765 | static struct ctl_table apparmor_sysctl_table[] = { | |
1766 | { | |
1767 | .procname = "unprivileged_userns_apparmor_policy", | |
1768 | .data = &unprivileged_userns_apparmor_policy, | |
1769 | .maxlen = sizeof(int), | |
1770 | .mode = 0600, | |
1771 | .proc_handler = apparmor_dointvec, | |
1772 | }, | |
524d8e14 JJ |
1773 | { |
1774 | .procname = "apparmor_display_secid_mode", | |
1775 | .data = &apparmor_display_secid_mode, | |
1776 | .maxlen = sizeof(int), | |
1777 | .mode = 0600, | |
1778 | .proc_handler = apparmor_dointvec, | |
1779 | }, | |
1780 | ||
e3ea1ca5 TH |
1781 | { } |
1782 | }; | |
1783 | ||
1784 | static int __init apparmor_init_sysctl(void) | |
1785 | { | |
1786 | return register_sysctl_paths(apparmor_sysctl_path, | |
1787 | apparmor_sysctl_table) ? 0 : -ENOMEM; | |
1788 | } | |
1789 | #else | |
1790 | static inline int apparmor_init_sysctl(void) | |
1791 | { | |
1792 | return 0; | |
1793 | } | |
1794 | #endif /* CONFIG_SYSCTL */ | |
1795 | ||
e1af4779 | 1796 | #if defined(CONFIG_NETFILTER) && defined(CONFIG_NETWORK_SECMARK) |
ab9f2115 MG |
1797 | static unsigned int apparmor_ip_postroute(void *priv, |
1798 | struct sk_buff *skb, | |
1799 | const struct nf_hook_state *state) | |
1800 | { | |
1801 | struct aa_sk_ctx *ctx; | |
1802 | struct sock *sk; | |
1803 | ||
1804 | if (!skb->secmark) | |
1805 | return NF_ACCEPT; | |
1806 | ||
1807 | sk = skb_to_full_sk(skb); | |
1808 | if (sk == NULL) | |
1809 | return NF_ACCEPT; | |
1810 | ||
1811 | ctx = SK_CTX(sk); | |
1812 | if (!apparmor_secmark_check(ctx->label, OP_SENDMSG, AA_MAY_SEND, | |
1813 | skb->secmark, sk)) | |
1814 | return NF_ACCEPT; | |
1815 | ||
1816 | return NF_DROP_ERR(-ECONNREFUSED); | |
1817 | ||
1818 | } | |
1819 | ||
ab9f2115 MG |
1820 | static const struct nf_hook_ops apparmor_nf_ops[] = { |
1821 | { | |
7b721124 | 1822 | .hook = apparmor_ip_postroute, |
ab9f2115 MG |
1823 | .pf = NFPROTO_IPV4, |
1824 | .hooknum = NF_INET_POST_ROUTING, | |
1825 | .priority = NF_IP_PRI_SELINUX_FIRST, | |
1826 | }, | |
1827 | #if IS_ENABLED(CONFIG_IPV6) | |
1828 | { | |
7b721124 | 1829 | .hook = apparmor_ip_postroute, |
ab9f2115 MG |
1830 | .pf = NFPROTO_IPV6, |
1831 | .hooknum = NF_INET_POST_ROUTING, | |
1832 | .priority = NF_IP6_PRI_SELINUX_FIRST, | |
1833 | }, | |
1834 | #endif | |
1835 | }; | |
1836 | ||
1837 | static int __net_init apparmor_nf_register(struct net *net) | |
1838 | { | |
84117994 | 1839 | return nf_register_net_hooks(net, apparmor_nf_ops, |
ab9f2115 | 1840 | ARRAY_SIZE(apparmor_nf_ops)); |
ab9f2115 MG |
1841 | } |
1842 | ||
1843 | static void __net_exit apparmor_nf_unregister(struct net *net) | |
1844 | { | |
1845 | nf_unregister_net_hooks(net, apparmor_nf_ops, | |
1846 | ARRAY_SIZE(apparmor_nf_ops)); | |
1847 | } | |
1848 | ||
1849 | static struct pernet_operations apparmor_net_ops = { | |
1850 | .init = apparmor_nf_register, | |
1851 | .exit = apparmor_nf_unregister, | |
1852 | }; | |
1853 | ||
1854 | static int __init apparmor_nf_ip_init(void) | |
1855 | { | |
1856 | int err; | |
1857 | ||
1858 | if (!apparmor_enabled) | |
1859 | return 0; | |
1860 | ||
1861 | err = register_pernet_subsys(&apparmor_net_ops); | |
1862 | if (err) | |
1863 | panic("Apparmor: register_pernet_subsys: error %d\n", err); | |
1864 | ||
1865 | return 0; | |
1866 | } | |
1867 | __initcall(apparmor_nf_ip_init); | |
e1af4779 | 1868 | #endif |
ab9f2115 | 1869 | |
b5e95b48 JJ |
1870 | static int __init apparmor_init(void) |
1871 | { | |
1872 | int error; | |
1873 | ||
11c236b8 JJ |
1874 | error = aa_setup_dfa_engine(); |
1875 | if (error) { | |
1876 | AA_ERROR("Unable to setup dfa engine\n"); | |
1877 | goto alloc_out; | |
1878 | } | |
1879 | ||
b5e95b48 JJ |
1880 | error = aa_alloc_root_ns(); |
1881 | if (error) { | |
1882 | AA_ERROR("Unable to allocate default profile namespace\n"); | |
1883 | goto alloc_out; | |
1884 | } | |
1885 | ||
e3ea1ca5 TH |
1886 | error = apparmor_init_sysctl(); |
1887 | if (error) { | |
1888 | AA_ERROR("Unable to register sysctls\n"); | |
1889 | goto alloc_out; | |
1890 | ||
1891 | } | |
1892 | ||
d4669f0b JJ |
1893 | error = alloc_buffers(); |
1894 | if (error) { | |
1895 | AA_ERROR("Unable to allocate work buffers\n"); | |
df323337 | 1896 | goto alloc_out; |
d4669f0b JJ |
1897 | } |
1898 | ||
55a26ebf | 1899 | error = set_init_ctx(); |
b5e95b48 JJ |
1900 | if (error) { |
1901 | AA_ERROR("Failed to set context on init task\n"); | |
b1d9e6b0 | 1902 | aa_free_root_ns(); |
d4669f0b | 1903 | goto buffers_out; |
b5e95b48 | 1904 | } |
d69dece5 CS |
1905 | security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks), |
1906 | "apparmor"); | |
b5e95b48 JJ |
1907 | |
1908 | /* Report that AppArmor successfully initialized */ | |
1909 | apparmor_initialized = 1; | |
1910 | if (aa_g_profile_mode == APPARMOR_COMPLAIN) | |
1911 | aa_info_message("AppArmor initialized: complain mode enabled"); | |
1912 | else if (aa_g_profile_mode == APPARMOR_KILL) | |
1913 | aa_info_message("AppArmor initialized: kill mode enabled"); | |
1914 | else | |
1915 | aa_info_message("AppArmor initialized"); | |
1916 | ||
1917 | return error; | |
1918 | ||
d4669f0b JJ |
1919 | buffers_out: |
1920 | destroy_buffers(); | |
b5e95b48 JJ |
1921 | alloc_out: |
1922 | aa_destroy_aafs(); | |
11c236b8 | 1923 | aa_teardown_dfa_engine(); |
b5e95b48 | 1924 | |
954317fe | 1925 | apparmor_enabled = false; |
b5e95b48 | 1926 | return error; |
b5e95b48 JJ |
1927 | } |
1928 | ||
3d6e5f6d | 1929 | DEFINE_LSM(apparmor) = { |
07aed2f2 | 1930 | .name = "apparmor", |
14bd99c8 | 1931 | .flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE, |
c5459b82 | 1932 | .enabled = &apparmor_enabled, |
bbd3662a | 1933 | .blobs = &apparmor_blob_sizes, |
3d6e5f6d KC |
1934 | .init = apparmor_init, |
1935 | }; |