Commit | Line | Data |
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b5e95b48 JJ |
1 | /* |
2 | * AppArmor security module | |
3 | * | |
4 | * This file contains AppArmor LSM hooks. | |
5 | * | |
6 | * Copyright (C) 1998-2008 Novell/SUSE | |
7 | * Copyright 2009-2010 Canonical Ltd. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License as | |
11 | * published by the Free Software Foundation, version 2 of the | |
12 | * License. | |
13 | */ | |
14 | ||
3c4ed7bd | 15 | #include <linux/lsm_hooks.h> |
b5e95b48 JJ |
16 | #include <linux/moduleparam.h> |
17 | #include <linux/mm.h> | |
18 | #include <linux/mman.h> | |
19 | #include <linux/mount.h> | |
20 | #include <linux/namei.h> | |
21 | #include <linux/ptrace.h> | |
22 | #include <linux/ctype.h> | |
23 | #include <linux/sysctl.h> | |
24 | #include <linux/audit.h> | |
3486740a | 25 | #include <linux/user_namespace.h> |
ab9f2115 MG |
26 | #include <linux/netfilter_ipv4.h> |
27 | #include <linux/netfilter_ipv6.h> | |
b5e95b48 | 28 | #include <net/sock.h> |
e262e32d | 29 | #include <uapi/linux/mount.h> |
b5e95b48 JJ |
30 | |
31 | #include "include/apparmor.h" | |
32 | #include "include/apparmorfs.h" | |
33 | #include "include/audit.h" | |
34 | #include "include/capability.h" | |
d8889d49 | 35 | #include "include/cred.h" |
b5e95b48 JJ |
36 | #include "include/file.h" |
37 | #include "include/ipc.h" | |
56974a6f | 38 | #include "include/net.h" |
b5e95b48 | 39 | #include "include/path.h" |
637f688d | 40 | #include "include/label.h" |
b5e95b48 | 41 | #include "include/policy.h" |
cff281f6 | 42 | #include "include/policy_ns.h" |
b5e95b48 | 43 | #include "include/procattr.h" |
2ea3ffb7 | 44 | #include "include/mount.h" |
c0929212 | 45 | #include "include/secid.h" |
b5e95b48 JJ |
46 | |
47 | /* Flag indicating whether initialization completed */ | |
545de8fe | 48 | int apparmor_initialized; |
b5e95b48 | 49 | |
d4669f0b JJ |
50 | DEFINE_PER_CPU(struct aa_buffers, aa_buffers); |
51 | ||
52 | ||
b5e95b48 JJ |
53 | /* |
54 | * LSM hook functions | |
55 | */ | |
56 | ||
57 | /* | |
d9087c49 | 58 | * put the associated labels |
b5e95b48 JJ |
59 | */ |
60 | static void apparmor_cred_free(struct cred *cred) | |
61 | { | |
d9087c49 | 62 | aa_put_label(cred_label(cred)); |
69b5a44a | 63 | set_cred_label(cred, NULL); |
b5e95b48 JJ |
64 | } |
65 | ||
66 | /* | |
67 | * allocate the apparmor part of blank credentials | |
68 | */ | |
69 | static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
70 | { | |
69b5a44a | 71 | set_cred_label(cred, NULL); |
b5e95b48 JJ |
72 | return 0; |
73 | } | |
74 | ||
75 | /* | |
d9087c49 | 76 | * prepare new cred label for modification by prepare_cred block |
b5e95b48 JJ |
77 | */ |
78 | static int apparmor_cred_prepare(struct cred *new, const struct cred *old, | |
79 | gfp_t gfp) | |
80 | { | |
69b5a44a | 81 | set_cred_label(new, aa_get_newest_label(cred_label(old))); |
b5e95b48 JJ |
82 | return 0; |
83 | } | |
84 | ||
85 | /* | |
86 | * transfer the apparmor data to a blank set of creds | |
87 | */ | |
88 | static void apparmor_cred_transfer(struct cred *new, const struct cred *old) | |
89 | { | |
69b5a44a | 90 | set_cred_label(new, aa_get_newest_label(cred_label(old))); |
b5e95b48 JJ |
91 | } |
92 | ||
3b529a76 JJ |
93 | static void apparmor_task_free(struct task_struct *task) |
94 | { | |
95 | ||
96 | aa_free_task_ctx(task_ctx(task)); | |
3b529a76 JJ |
97 | } |
98 | ||
99 | static int apparmor_task_alloc(struct task_struct *task, | |
100 | unsigned long clone_flags) | |
101 | { | |
f4ad8f2c | 102 | struct aa_task_ctx *new = task_ctx(task); |
3b529a76 | 103 | |
de62de59 | 104 | aa_dup_task_ctx(new, task_ctx(current)); |
b5e95b48 | 105 | |
3b529a76 | 106 | return 0; |
b5e95b48 JJ |
107 | } |
108 | ||
109 | static int apparmor_ptrace_access_check(struct task_struct *child, | |
110 | unsigned int mode) | |
111 | { | |
b2d09ae4 JJ |
112 | struct aa_label *tracer, *tracee; |
113 | int error; | |
114 | ||
1f8266ff | 115 | tracer = __begin_current_label_crit_section(); |
b2d09ae4 JJ |
116 | tracee = aa_get_task_label(child); |
117 | error = aa_may_ptrace(tracer, tracee, | |
338d0be4 JJ |
118 | (mode & PTRACE_MODE_READ) ? AA_PTRACE_READ |
119 | : AA_PTRACE_TRACE); | |
b2d09ae4 | 120 | aa_put_label(tracee); |
1f8266ff | 121 | __end_current_label_crit_section(tracer); |
b2d09ae4 JJ |
122 | |
123 | return error; | |
b5e95b48 JJ |
124 | } |
125 | ||
126 | static int apparmor_ptrace_traceme(struct task_struct *parent) | |
127 | { | |
b2d09ae4 JJ |
128 | struct aa_label *tracer, *tracee; |
129 | int error; | |
130 | ||
ca3fde52 | 131 | tracee = __begin_current_label_crit_section(); |
b2d09ae4 JJ |
132 | tracer = aa_get_task_label(parent); |
133 | error = aa_may_ptrace(tracer, tracee, AA_PTRACE_TRACE); | |
134 | aa_put_label(tracer); | |
ca3fde52 | 135 | __end_current_label_crit_section(tracee); |
b2d09ae4 JJ |
136 | |
137 | return error; | |
b5e95b48 JJ |
138 | } |
139 | ||
140 | /* Derived from security/commoncap.c:cap_capget */ | |
141 | static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective, | |
142 | kernel_cap_t *inheritable, kernel_cap_t *permitted) | |
143 | { | |
637f688d | 144 | struct aa_label *label; |
b5e95b48 JJ |
145 | const struct cred *cred; |
146 | ||
147 | rcu_read_lock(); | |
148 | cred = __task_cred(target); | |
637f688d | 149 | label = aa_get_newest_cred_label(cred); |
c70c86c4 | 150 | |
b1d9e6b0 CS |
151 | /* |
152 | * cap_capget is stacked ahead of this and will | |
153 | * initialize effective and permitted. | |
154 | */ | |
c70c86c4 JJ |
155 | if (!unconfined(label)) { |
156 | struct aa_profile *profile; | |
157 | struct label_it i; | |
158 | ||
159 | label_for_each_confined(i, label, profile) { | |
160 | if (COMPLAIN_MODE(profile)) | |
161 | continue; | |
162 | *effective = cap_intersect(*effective, | |
163 | profile->caps.allow); | |
164 | *permitted = cap_intersect(*permitted, | |
165 | profile->caps.allow); | |
166 | } | |
b5e95b48 JJ |
167 | } |
168 | rcu_read_unlock(); | |
637f688d | 169 | aa_put_label(label); |
b5e95b48 JJ |
170 | |
171 | return 0; | |
172 | } | |
173 | ||
6a9de491 | 174 | static int apparmor_capable(const struct cred *cred, struct user_namespace *ns, |
c1a85a00 | 175 | int cap, unsigned int opts) |
b5e95b48 | 176 | { |
637f688d | 177 | struct aa_label *label; |
b1d9e6b0 CS |
178 | int error = 0; |
179 | ||
637f688d JJ |
180 | label = aa_get_newest_cred_label(cred); |
181 | if (!unconfined(label)) | |
c1a85a00 | 182 | error = aa_capable(label, cap, opts); |
637f688d | 183 | aa_put_label(label); |
cf797c0e | 184 | |
b5e95b48 JJ |
185 | return error; |
186 | } | |
187 | ||
188 | /** | |
189 | * common_perm - basic common permission check wrapper fn for paths | |
190 | * @op: operation being checked | |
191 | * @path: path to check permission of (NOT NULL) | |
192 | * @mask: requested permissions mask | |
193 | * @cond: conditional info for the permission request (NOT NULL) | |
194 | * | |
195 | * Returns: %0 else error code if error or permission denied | |
196 | */ | |
47f6e5cc | 197 | static int common_perm(const char *op, const struct path *path, u32 mask, |
b5e95b48 JJ |
198 | struct path_cond *cond) |
199 | { | |
637f688d | 200 | struct aa_label *label; |
b5e95b48 JJ |
201 | int error = 0; |
202 | ||
637f688d JJ |
203 | label = __begin_current_label_crit_section(); |
204 | if (!unconfined(label)) | |
aebd873e | 205 | error = aa_path_perm(op, label, path, 0, mask, cond); |
637f688d | 206 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
207 | |
208 | return error; | |
209 | } | |
210 | ||
211 | /** | |
31f75bfe | 212 | * common_perm_cond - common permission wrapper around inode cond |
b5e95b48 | 213 | * @op: operation being checked |
31f75bfe | 214 | * @path: location to check (NOT NULL) |
b5e95b48 | 215 | * @mask: requested permissions mask |
b5e95b48 JJ |
216 | * |
217 | * Returns: %0 else error code if error or permission denied | |
218 | */ | |
31f75bfe | 219 | static int common_perm_cond(const char *op, const struct path *path, u32 mask) |
b5e95b48 | 220 | { |
31f75bfe JJ |
221 | struct path_cond cond = { d_backing_inode(path->dentry)->i_uid, |
222 | d_backing_inode(path->dentry)->i_mode | |
223 | }; | |
b5e95b48 | 224 | |
31f75bfe JJ |
225 | if (!path_mediated_fs(path->dentry)) |
226 | return 0; | |
227 | ||
228 | return common_perm(op, path, mask, &cond); | |
b5e95b48 JJ |
229 | } |
230 | ||
231 | /** | |
31f75bfe | 232 | * common_perm_dir_dentry - common permission wrapper when path is dir, dentry |
b5e95b48 | 233 | * @op: operation being checked |
31f75bfe JJ |
234 | * @dir: directory of the dentry (NOT NULL) |
235 | * @dentry: dentry to check (NOT NULL) | |
b5e95b48 | 236 | * @mask: requested permissions mask |
31f75bfe | 237 | * @cond: conditional info for the permission request (NOT NULL) |
b5e95b48 JJ |
238 | * |
239 | * Returns: %0 else error code if error or permission denied | |
240 | */ | |
31f75bfe JJ |
241 | static int common_perm_dir_dentry(const char *op, const struct path *dir, |
242 | struct dentry *dentry, u32 mask, | |
243 | struct path_cond *cond) | |
b5e95b48 | 244 | { |
31f75bfe | 245 | struct path path = { .mnt = dir->mnt, .dentry = dentry }; |
b5e95b48 | 246 | |
31f75bfe | 247 | return common_perm(op, &path, mask, cond); |
b5e95b48 JJ |
248 | } |
249 | ||
250 | /** | |
251 | * common_perm_rm - common permission wrapper for operations doing rm | |
252 | * @op: operation being checked | |
253 | * @dir: directory that the dentry is in (NOT NULL) | |
254 | * @dentry: dentry being rm'd (NOT NULL) | |
255 | * @mask: requested permission mask | |
256 | * | |
257 | * Returns: %0 else error code if error or permission denied | |
258 | */ | |
47f6e5cc | 259 | static int common_perm_rm(const char *op, const struct path *dir, |
b5e95b48 JJ |
260 | struct dentry *dentry, u32 mask) |
261 | { | |
c6f493d6 | 262 | struct inode *inode = d_backing_inode(dentry); |
b5e95b48 JJ |
263 | struct path_cond cond = { }; |
264 | ||
efeee83a | 265 | if (!inode || !path_mediated_fs(dentry)) |
b5e95b48 JJ |
266 | return 0; |
267 | ||
268 | cond.uid = inode->i_uid; | |
269 | cond.mode = inode->i_mode; | |
270 | ||
271 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
272 | } | |
273 | ||
274 | /** | |
275 | * common_perm_create - common permission wrapper for operations doing create | |
276 | * @op: operation being checked | |
277 | * @dir: directory that dentry will be created in (NOT NULL) | |
278 | * @dentry: dentry to create (NOT NULL) | |
279 | * @mask: request permission mask | |
280 | * @mode: created file mode | |
281 | * | |
282 | * Returns: %0 else error code if error or permission denied | |
283 | */ | |
47f6e5cc | 284 | static int common_perm_create(const char *op, const struct path *dir, |
d6b49f7a | 285 | struct dentry *dentry, u32 mask, umode_t mode) |
b5e95b48 JJ |
286 | { |
287 | struct path_cond cond = { current_fsuid(), mode }; | |
288 | ||
efeee83a | 289 | if (!path_mediated_fs(dir->dentry)) |
b5e95b48 JJ |
290 | return 0; |
291 | ||
292 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
293 | } | |
294 | ||
989f74e0 | 295 | static int apparmor_path_unlink(const struct path *dir, struct dentry *dentry) |
b5e95b48 JJ |
296 | { |
297 | return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE); | |
298 | } | |
299 | ||
d3607752 | 300 | static int apparmor_path_mkdir(const struct path *dir, struct dentry *dentry, |
4572befe | 301 | umode_t mode) |
b5e95b48 JJ |
302 | { |
303 | return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE, | |
304 | S_IFDIR); | |
305 | } | |
306 | ||
989f74e0 | 307 | static int apparmor_path_rmdir(const struct path *dir, struct dentry *dentry) |
b5e95b48 JJ |
308 | { |
309 | return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE); | |
310 | } | |
311 | ||
d3607752 | 312 | static int apparmor_path_mknod(const struct path *dir, struct dentry *dentry, |
04fc66e7 | 313 | umode_t mode, unsigned int dev) |
b5e95b48 JJ |
314 | { |
315 | return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode); | |
316 | } | |
317 | ||
81f4c506 | 318 | static int apparmor_path_truncate(const struct path *path) |
b5e95b48 | 319 | { |
e53cfe6c | 320 | return common_perm_cond(OP_TRUNC, path, MAY_WRITE | AA_MAY_SETATTR); |
b5e95b48 JJ |
321 | } |
322 | ||
d3607752 | 323 | static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry, |
b5e95b48 JJ |
324 | const char *old_name) |
325 | { | |
326 | return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE, | |
327 | S_IFLNK); | |
328 | } | |
329 | ||
3ccee46a | 330 | static int apparmor_path_link(struct dentry *old_dentry, const struct path *new_dir, |
b5e95b48 JJ |
331 | struct dentry *new_dentry) |
332 | { | |
637f688d | 333 | struct aa_label *label; |
b5e95b48 JJ |
334 | int error = 0; |
335 | ||
efeee83a | 336 | if (!path_mediated_fs(old_dentry)) |
b5e95b48 JJ |
337 | return 0; |
338 | ||
637f688d JJ |
339 | label = begin_current_label_crit_section(); |
340 | if (!unconfined(label)) | |
8014370f | 341 | error = aa_path_link(label, old_dentry, new_dir, new_dentry); |
637f688d | 342 | end_current_label_crit_section(label); |
cf797c0e | 343 | |
b5e95b48 JJ |
344 | return error; |
345 | } | |
346 | ||
3ccee46a AV |
347 | static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry, |
348 | const struct path *new_dir, struct dentry *new_dentry) | |
b5e95b48 | 349 | { |
637f688d | 350 | struct aa_label *label; |
b5e95b48 JJ |
351 | int error = 0; |
352 | ||
efeee83a | 353 | if (!path_mediated_fs(old_dentry)) |
b5e95b48 JJ |
354 | return 0; |
355 | ||
637f688d JJ |
356 | label = begin_current_label_crit_section(); |
357 | if (!unconfined(label)) { | |
8486adf0 KC |
358 | struct path old_path = { .mnt = old_dir->mnt, |
359 | .dentry = old_dentry }; | |
360 | struct path new_path = { .mnt = new_dir->mnt, | |
361 | .dentry = new_dentry }; | |
c6f493d6 DH |
362 | struct path_cond cond = { d_backing_inode(old_dentry)->i_uid, |
363 | d_backing_inode(old_dentry)->i_mode | |
b5e95b48 JJ |
364 | }; |
365 | ||
aebd873e | 366 | error = aa_path_perm(OP_RENAME_SRC, label, &old_path, 0, |
e53cfe6c JJ |
367 | MAY_READ | AA_MAY_GETATTR | MAY_WRITE | |
368 | AA_MAY_SETATTR | AA_MAY_DELETE, | |
b5e95b48 JJ |
369 | &cond); |
370 | if (!error) | |
aebd873e | 371 | error = aa_path_perm(OP_RENAME_DEST, label, &new_path, |
e53cfe6c | 372 | 0, MAY_WRITE | AA_MAY_SETATTR | |
b5e95b48 JJ |
373 | AA_MAY_CREATE, &cond); |
374 | ||
375 | } | |
637f688d | 376 | end_current_label_crit_section(label); |
cf797c0e | 377 | |
b5e95b48 JJ |
378 | return error; |
379 | } | |
380 | ||
be01f9f2 | 381 | static int apparmor_path_chmod(const struct path *path, umode_t mode) |
b5e95b48 | 382 | { |
31f75bfe | 383 | return common_perm_cond(OP_CHMOD, path, AA_MAY_CHMOD); |
b5e95b48 JJ |
384 | } |
385 | ||
7fd25dac | 386 | static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid) |
b5e95b48 | 387 | { |
31f75bfe | 388 | return common_perm_cond(OP_CHOWN, path, AA_MAY_CHOWN); |
b5e95b48 JJ |
389 | } |
390 | ||
3f7036a0 | 391 | static int apparmor_inode_getattr(const struct path *path) |
b5e95b48 | 392 | { |
e53cfe6c | 393 | return common_perm_cond(OP_GETATTR, path, AA_MAY_GETATTR); |
b5e95b48 JJ |
394 | } |
395 | ||
94817692 | 396 | static int apparmor_file_open(struct file *file) |
b5e95b48 | 397 | { |
637f688d JJ |
398 | struct aa_file_ctx *fctx = file_ctx(file); |
399 | struct aa_label *label; | |
b5e95b48 JJ |
400 | int error = 0; |
401 | ||
efeee83a | 402 | if (!path_mediated_fs(file->f_path.dentry)) |
b5e95b48 JJ |
403 | return 0; |
404 | ||
405 | /* If in exec, permission is handled by bprm hooks. | |
406 | * Cache permissions granted by the previous exec check, with | |
407 | * implicit read and executable mmap which are required to | |
408 | * actually execute the image. | |
409 | */ | |
410 | if (current->in_execve) { | |
55a26ebf | 411 | fctx->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP; |
b5e95b48 JJ |
412 | return 0; |
413 | } | |
414 | ||
94817692 | 415 | label = aa_get_newest_cred_label(file->f_cred); |
637f688d | 416 | if (!unconfined(label)) { |
496ad9aa | 417 | struct inode *inode = file_inode(file); |
b5e95b48 JJ |
418 | struct path_cond cond = { inode->i_uid, inode->i_mode }; |
419 | ||
aebd873e | 420 | error = aa_path_perm(OP_OPEN, label, &file->f_path, 0, |
b5e95b48 JJ |
421 | aa_map_file_to_perms(file), &cond); |
422 | /* todo cache full allowed permissions set and state */ | |
55a26ebf | 423 | fctx->allow = aa_map_file_to_perms(file); |
b5e95b48 | 424 | } |
637f688d | 425 | aa_put_label(label); |
b5e95b48 JJ |
426 | |
427 | return error; | |
428 | } | |
429 | ||
430 | static int apparmor_file_alloc_security(struct file *file) | |
431 | { | |
33bf60ca | 432 | struct aa_file_ctx *ctx = file_ctx(file); |
637f688d | 433 | struct aa_label *label = begin_current_label_crit_section(); |
b5e95b48 | 434 | |
33bf60ca CS |
435 | spin_lock_init(&ctx->lock); |
436 | rcu_assign_pointer(ctx->label, aa_get_label(label)); | |
437 | end_current_label_crit_section(label); | |
438 | return 0; | |
b5e95b48 JJ |
439 | } |
440 | ||
441 | static void apparmor_file_free_security(struct file *file) | |
442 | { | |
33bf60ca CS |
443 | struct aa_file_ctx *ctx = file_ctx(file); |
444 | ||
445 | if (ctx) | |
446 | aa_put_label(rcu_access_pointer(ctx->label)); | |
b5e95b48 JJ |
447 | } |
448 | ||
47f6e5cc | 449 | static int common_file_perm(const char *op, struct file *file, u32 mask) |
b5e95b48 | 450 | { |
190a9518 | 451 | struct aa_label *label; |
b5e95b48 JJ |
452 | int error = 0; |
453 | ||
192ca6b5 JJ |
454 | /* don't reaudit files closed during inheritance */ |
455 | if (file->f_path.dentry == aa_null.dentry) | |
456 | return -EACCES; | |
457 | ||
637f688d | 458 | label = __begin_current_label_crit_section(); |
190a9518 | 459 | error = aa_file_perm(op, label, file, mask); |
637f688d | 460 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
461 | |
462 | return error; | |
463 | } | |
464 | ||
064dc947 JJ |
465 | static int apparmor_file_receive(struct file *file) |
466 | { | |
467 | return common_file_perm(OP_FRECEIVE, file, aa_map_file_to_perms(file)); | |
468 | } | |
469 | ||
b5e95b48 JJ |
470 | static int apparmor_file_permission(struct file *file, int mask) |
471 | { | |
472 | return common_file_perm(OP_FPERM, file, mask); | |
473 | } | |
474 | ||
475 | static int apparmor_file_lock(struct file *file, unsigned int cmd) | |
476 | { | |
477 | u32 mask = AA_MAY_LOCK; | |
478 | ||
479 | if (cmd == F_WRLCK) | |
480 | mask |= MAY_WRITE; | |
481 | ||
482 | return common_file_perm(OP_FLOCK, file, mask); | |
483 | } | |
484 | ||
47f6e5cc | 485 | static int common_mmap(const char *op, struct file *file, unsigned long prot, |
b5e95b48 JJ |
486 | unsigned long flags) |
487 | { | |
b5e95b48 JJ |
488 | int mask = 0; |
489 | ||
637f688d | 490 | if (!file || !file_ctx(file)) |
b5e95b48 JJ |
491 | return 0; |
492 | ||
493 | if (prot & PROT_READ) | |
494 | mask |= MAY_READ; | |
495 | /* | |
496 | * Private mappings don't require write perms since they don't | |
497 | * write back to the files | |
498 | */ | |
499 | if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE)) | |
500 | mask |= MAY_WRITE; | |
501 | if (prot & PROT_EXEC) | |
502 | mask |= AA_EXEC_MMAP; | |
503 | ||
b5e95b48 JJ |
504 | return common_file_perm(op, file, mask); |
505 | } | |
506 | ||
e5467859 AV |
507 | static int apparmor_mmap_file(struct file *file, unsigned long reqprot, |
508 | unsigned long prot, unsigned long flags) | |
b5e95b48 | 509 | { |
b5e95b48 JJ |
510 | return common_mmap(OP_FMMAP, file, prot, flags); |
511 | } | |
512 | ||
513 | static int apparmor_file_mprotect(struct vm_area_struct *vma, | |
514 | unsigned long reqprot, unsigned long prot) | |
515 | { | |
516 | return common_mmap(OP_FMPROT, vma->vm_file, prot, | |
517 | !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0); | |
518 | } | |
519 | ||
2ea3ffb7 JJ |
520 | static int apparmor_sb_mount(const char *dev_name, const struct path *path, |
521 | const char *type, unsigned long flags, void *data) | |
522 | { | |
523 | struct aa_label *label; | |
524 | int error = 0; | |
525 | ||
526 | /* Discard magic */ | |
527 | if ((flags & MS_MGC_MSK) == MS_MGC_VAL) | |
528 | flags &= ~MS_MGC_MSK; | |
529 | ||
530 | flags &= ~AA_MS_IGNORE_MASK; | |
531 | ||
532 | label = __begin_current_label_crit_section(); | |
533 | if (!unconfined(label)) { | |
534 | if (flags & MS_REMOUNT) | |
535 | error = aa_remount(label, path, flags, data); | |
536 | else if (flags & MS_BIND) | |
537 | error = aa_bind_mount(label, path, dev_name, flags); | |
538 | else if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE | | |
539 | MS_UNBINDABLE)) | |
540 | error = aa_mount_change_type(label, path, flags); | |
541 | else if (flags & MS_MOVE) | |
542 | error = aa_move_mount(label, path, dev_name); | |
543 | else | |
544 | error = aa_new_mount(label, dev_name, path, type, | |
545 | flags, data); | |
546 | } | |
547 | __end_current_label_crit_section(label); | |
548 | ||
549 | return error; | |
550 | } | |
551 | ||
552 | static int apparmor_sb_umount(struct vfsmount *mnt, int flags) | |
553 | { | |
554 | struct aa_label *label; | |
555 | int error = 0; | |
556 | ||
557 | label = __begin_current_label_crit_section(); | |
558 | if (!unconfined(label)) | |
559 | error = aa_umount(label, mnt, flags); | |
560 | __end_current_label_crit_section(label); | |
561 | ||
562 | return error; | |
563 | } | |
564 | ||
565 | static int apparmor_sb_pivotroot(const struct path *old_path, | |
566 | const struct path *new_path) | |
567 | { | |
568 | struct aa_label *label; | |
569 | int error = 0; | |
570 | ||
571 | label = aa_get_current_label(); | |
572 | if (!unconfined(label)) | |
573 | error = aa_pivotroot(label, old_path, new_path); | |
574 | aa_put_label(label); | |
575 | ||
576 | return error; | |
577 | } | |
578 | ||
b5e95b48 JJ |
579 | static int apparmor_getprocattr(struct task_struct *task, char *name, |
580 | char **value) | |
581 | { | |
582 | int error = -ENOENT; | |
b5e95b48 JJ |
583 | /* released below */ |
584 | const struct cred *cred = get_task_cred(task); | |
de62de59 | 585 | struct aa_task_ctx *ctx = task_ctx(current); |
637f688d | 586 | struct aa_label *label = NULL; |
b5e95b48 JJ |
587 | |
588 | if (strcmp(name, "current") == 0) | |
d9087c49 | 589 | label = aa_get_newest_label(cred_label(cred)); |
55a26ebf | 590 | else if (strcmp(name, "prev") == 0 && ctx->previous) |
637f688d | 591 | label = aa_get_newest_label(ctx->previous); |
55a26ebf | 592 | else if (strcmp(name, "exec") == 0 && ctx->onexec) |
637f688d | 593 | label = aa_get_newest_label(ctx->onexec); |
b5e95b48 JJ |
594 | else |
595 | error = -EINVAL; | |
596 | ||
637f688d | 597 | if (label) |
76a1d263 | 598 | error = aa_getprocattr(label, value); |
77b071b3 | 599 | |
637f688d | 600 | aa_put_label(label); |
b5e95b48 JJ |
601 | put_cred(cred); |
602 | ||
603 | return error; | |
604 | } | |
605 | ||
b21507e2 SS |
606 | static int apparmor_setprocattr(const char *name, void *value, |
607 | size_t size) | |
b5e95b48 | 608 | { |
e89b8081 | 609 | char *command, *largs = NULL, *args = value; |
b5e95b48 JJ |
610 | size_t arg_size; |
611 | int error; | |
ef88a7ac | 612 | DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SETPROCATTR); |
b5e95b48 JJ |
613 | |
614 | if (size == 0) | |
615 | return -EINVAL; | |
b5e95b48 | 616 | |
e89b8081 VN |
617 | /* AppArmor requires that the buffer must be null terminated atm */ |
618 | if (args[size - 1] != '\0') { | |
619 | /* null terminate */ | |
620 | largs = args = kmalloc(size + 1, GFP_KERNEL); | |
621 | if (!args) | |
622 | return -ENOMEM; | |
623 | memcpy(args, value, size); | |
624 | args[size] = '\0'; | |
625 | } | |
626 | ||
627 | error = -EINVAL; | |
b5e95b48 JJ |
628 | args = strim(args); |
629 | command = strsep(&args, " "); | |
630 | if (!args) | |
e89b8081 | 631 | goto out; |
b5e95b48 JJ |
632 | args = skip_spaces(args); |
633 | if (!*args) | |
e89b8081 | 634 | goto out; |
b5e95b48 | 635 | |
d4d03f74 | 636 | arg_size = size - (args - (largs ? largs : (char *) value)); |
b5e95b48 JJ |
637 | if (strcmp(name, "current") == 0) { |
638 | if (strcmp(command, "changehat") == 0) { | |
639 | error = aa_setprocattr_changehat(args, arg_size, | |
df8073c6 | 640 | AA_CHANGE_NOFLAGS); |
b5e95b48 JJ |
641 | } else if (strcmp(command, "permhat") == 0) { |
642 | error = aa_setprocattr_changehat(args, arg_size, | |
df8073c6 | 643 | AA_CHANGE_TEST); |
b5e95b48 | 644 | } else if (strcmp(command, "changeprofile") == 0) { |
df8073c6 | 645 | error = aa_change_profile(args, AA_CHANGE_NOFLAGS); |
b5e95b48 | 646 | } else if (strcmp(command, "permprofile") == 0) { |
df8073c6 | 647 | error = aa_change_profile(args, AA_CHANGE_TEST); |
6c5fc8f1 JJ |
648 | } else if (strcmp(command, "stack") == 0) { |
649 | error = aa_change_profile(args, AA_CHANGE_STACK); | |
3eea57c2 JJ |
650 | } else |
651 | goto fail; | |
b5e95b48 | 652 | } else if (strcmp(name, "exec") == 0) { |
3eea57c2 | 653 | if (strcmp(command, "exec") == 0) |
df8073c6 | 654 | error = aa_change_profile(args, AA_CHANGE_ONEXEC); |
6c5fc8f1 JJ |
655 | else if (strcmp(command, "stack") == 0) |
656 | error = aa_change_profile(args, (AA_CHANGE_ONEXEC | | |
657 | AA_CHANGE_STACK)); | |
3eea57c2 JJ |
658 | else |
659 | goto fail; | |
660 | } else | |
b5e95b48 | 661 | /* only support the "current" and "exec" process attributes */ |
e89b8081 | 662 | goto fail; |
3eea57c2 | 663 | |
b5e95b48 JJ |
664 | if (!error) |
665 | error = size; | |
e89b8081 VN |
666 | out: |
667 | kfree(largs); | |
b5e95b48 | 668 | return error; |
3eea57c2 JJ |
669 | |
670 | fail: | |
637f688d | 671 | aad(&sa)->label = begin_current_label_crit_section(); |
ef88a7ac JJ |
672 | aad(&sa)->info = name; |
673 | aad(&sa)->error = error = -EINVAL; | |
3eea57c2 | 674 | aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL); |
637f688d | 675 | end_current_label_crit_section(aad(&sa)->label); |
e89b8081 | 676 | goto out; |
b5e95b48 JJ |
677 | } |
678 | ||
fe864821 JJ |
679 | /** |
680 | * apparmor_bprm_committing_creds - do task cleanup on committing new creds | |
681 | * @bprm: binprm for the exec (NOT NULL) | |
682 | */ | |
683 | static void apparmor_bprm_committing_creds(struct linux_binprm *bprm) | |
684 | { | |
637f688d | 685 | struct aa_label *label = aa_current_raw_label(); |
d9087c49 | 686 | struct aa_label *new_label = cred_label(bprm->cred); |
fe864821 JJ |
687 | |
688 | /* bail out if unconfined or not changing profile */ | |
d9087c49 JJ |
689 | if ((new_label->proxy == label->proxy) || |
690 | (unconfined(new_label))) | |
fe864821 JJ |
691 | return; |
692 | ||
192ca6b5 JJ |
693 | aa_inherit_files(bprm->cred, current->files); |
694 | ||
fe864821 JJ |
695 | current->pdeath_signal = 0; |
696 | ||
637f688d | 697 | /* reset soft limits and set hard limits for the new label */ |
d9087c49 | 698 | __aa_transition_rlimits(label, new_label); |
fe864821 JJ |
699 | } |
700 | ||
701 | /** | |
702 | * apparmor_bprm_committed_cred - do cleanup after new creds committed | |
703 | * @bprm: binprm for the exec (NOT NULL) | |
704 | */ | |
705 | static void apparmor_bprm_committed_creds(struct linux_binprm *bprm) | |
706 | { | |
3b529a76 | 707 | /* clear out temporary/transitional state from the context */ |
de62de59 | 708 | aa_clear_task_ctx_trans(task_ctx(current)); |
3b529a76 | 709 | |
fe864821 JJ |
710 | return; |
711 | } | |
712 | ||
a7ae3645 JJ |
713 | static void apparmor_task_getsecid(struct task_struct *p, u32 *secid) |
714 | { | |
715 | struct aa_label *label = aa_get_task_label(p); | |
716 | *secid = label->secid; | |
717 | aa_put_label(label); | |
718 | } | |
719 | ||
7cb4dc9f JS |
720 | static int apparmor_task_setrlimit(struct task_struct *task, |
721 | unsigned int resource, struct rlimit *new_rlim) | |
b5e95b48 | 722 | { |
637f688d | 723 | struct aa_label *label = __begin_current_label_crit_section(); |
b5e95b48 JJ |
724 | int error = 0; |
725 | ||
637f688d | 726 | if (!unconfined(label)) |
86b92cb7 | 727 | error = aa_task_setrlimit(label, task, resource, new_rlim); |
637f688d | 728 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
729 | |
730 | return error; | |
731 | } | |
732 | ||
ae7795bc | 733 | static int apparmor_task_kill(struct task_struct *target, struct kernel_siginfo *info, |
6b4f3d01 | 734 | int sig, const struct cred *cred) |
cd1dbf76 JJ |
735 | { |
736 | struct aa_label *cl, *tl; | |
737 | int error; | |
738 | ||
6b4f3d01 SS |
739 | if (cred) { |
740 | /* | |
741 | * Dealing with USB IO specific behavior | |
cd1dbf76 | 742 | */ |
6b4f3d01 SS |
743 | cl = aa_get_newest_cred_label(cred); |
744 | tl = aa_get_task_label(target); | |
745 | error = aa_may_signal(cl, tl, sig); | |
746 | aa_put_label(cl); | |
747 | aa_put_label(tl); | |
748 | return error; | |
749 | } | |
750 | ||
cd1dbf76 JJ |
751 | cl = __begin_current_label_crit_section(); |
752 | tl = aa_get_task_label(target); | |
753 | error = aa_may_signal(cl, tl, sig); | |
754 | aa_put_label(tl); | |
755 | __end_current_label_crit_section(cl); | |
756 | ||
757 | return error; | |
758 | } | |
759 | ||
56974a6f JJ |
760 | /** |
761 | * apparmor_sk_alloc_security - allocate and attach the sk_security field | |
762 | */ | |
763 | static int apparmor_sk_alloc_security(struct sock *sk, int family, gfp_t flags) | |
764 | { | |
765 | struct aa_sk_ctx *ctx; | |
766 | ||
767 | ctx = kzalloc(sizeof(*ctx), flags); | |
768 | if (!ctx) | |
769 | return -ENOMEM; | |
770 | ||
771 | SK_CTX(sk) = ctx; | |
772 | ||
773 | return 0; | |
774 | } | |
775 | ||
776 | /** | |
777 | * apparmor_sk_free_security - free the sk_security field | |
778 | */ | |
779 | static void apparmor_sk_free_security(struct sock *sk) | |
780 | { | |
781 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
782 | ||
783 | SK_CTX(sk) = NULL; | |
784 | aa_put_label(ctx->label); | |
785 | aa_put_label(ctx->peer); | |
786 | kfree(ctx); | |
787 | } | |
788 | ||
789 | /** | |
790 | * apparmor_clone_security - clone the sk_security field | |
791 | */ | |
792 | static void apparmor_sk_clone_security(const struct sock *sk, | |
793 | struct sock *newsk) | |
794 | { | |
795 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
796 | struct aa_sk_ctx *new = SK_CTX(newsk); | |
797 | ||
798 | new->label = aa_get_label(ctx->label); | |
799 | new->peer = aa_get_label(ctx->peer); | |
800 | } | |
801 | ||
802 | /** | |
803 | * apparmor_socket_create - check perms before creating a new socket | |
804 | */ | |
805 | static int apparmor_socket_create(int family, int type, int protocol, int kern) | |
806 | { | |
807 | struct aa_label *label; | |
808 | int error = 0; | |
809 | ||
810 | AA_BUG(in_interrupt()); | |
811 | ||
812 | label = begin_current_label_crit_section(); | |
813 | if (!(kern || unconfined(label))) | |
814 | error = af_select(family, | |
815 | create_perm(label, family, type, protocol), | |
816 | aa_af_perm(label, OP_CREATE, AA_MAY_CREATE, | |
817 | family, type, protocol)); | |
818 | end_current_label_crit_section(label); | |
819 | ||
820 | return error; | |
821 | } | |
822 | ||
823 | /** | |
824 | * apparmor_socket_post_create - setup the per-socket security struct | |
825 | * | |
826 | * Note: | |
827 | * - kernel sockets currently labeled unconfined but we may want to | |
828 | * move to a special kernel label | |
829 | * - socket may not have sk here if created with sock_create_lite or | |
830 | * sock_alloc. These should be accept cases which will be handled in | |
831 | * sock_graft. | |
832 | */ | |
833 | static int apparmor_socket_post_create(struct socket *sock, int family, | |
834 | int type, int protocol, int kern) | |
835 | { | |
836 | struct aa_label *label; | |
837 | ||
838 | if (kern) { | |
839 | struct aa_ns *ns = aa_get_current_ns(); | |
840 | ||
841 | label = aa_get_label(ns_unconfined(ns)); | |
842 | aa_put_ns(ns); | |
843 | } else | |
844 | label = aa_get_current_label(); | |
845 | ||
846 | if (sock->sk) { | |
847 | struct aa_sk_ctx *ctx = SK_CTX(sock->sk); | |
848 | ||
849 | aa_put_label(ctx->label); | |
850 | ctx->label = aa_get_label(label); | |
851 | } | |
852 | aa_put_label(label); | |
853 | ||
854 | return 0; | |
855 | } | |
856 | ||
857 | /** | |
858 | * apparmor_socket_bind - check perms before bind addr to socket | |
859 | */ | |
860 | static int apparmor_socket_bind(struct socket *sock, | |
861 | struct sockaddr *address, int addrlen) | |
862 | { | |
863 | AA_BUG(!sock); | |
864 | AA_BUG(!sock->sk); | |
865 | AA_BUG(!address); | |
866 | AA_BUG(in_interrupt()); | |
867 | ||
868 | return af_select(sock->sk->sk_family, | |
869 | bind_perm(sock, address, addrlen), | |
870 | aa_sk_perm(OP_BIND, AA_MAY_BIND, sock->sk)); | |
871 | } | |
872 | ||
873 | /** | |
874 | * apparmor_socket_connect - check perms before connecting @sock to @address | |
875 | */ | |
876 | static int apparmor_socket_connect(struct socket *sock, | |
877 | struct sockaddr *address, int addrlen) | |
878 | { | |
879 | AA_BUG(!sock); | |
880 | AA_BUG(!sock->sk); | |
881 | AA_BUG(!address); | |
882 | AA_BUG(in_interrupt()); | |
883 | ||
884 | return af_select(sock->sk->sk_family, | |
885 | connect_perm(sock, address, addrlen), | |
886 | aa_sk_perm(OP_CONNECT, AA_MAY_CONNECT, sock->sk)); | |
887 | } | |
888 | ||
889 | /** | |
890 | * apparmor_socket_list - check perms before allowing listen | |
891 | */ | |
892 | static int apparmor_socket_listen(struct socket *sock, int backlog) | |
893 | { | |
894 | AA_BUG(!sock); | |
895 | AA_BUG(!sock->sk); | |
896 | AA_BUG(in_interrupt()); | |
897 | ||
898 | return af_select(sock->sk->sk_family, | |
899 | listen_perm(sock, backlog), | |
900 | aa_sk_perm(OP_LISTEN, AA_MAY_LISTEN, sock->sk)); | |
901 | } | |
902 | ||
903 | /** | |
904 | * apparmor_socket_accept - check perms before accepting a new connection. | |
905 | * | |
906 | * Note: while @newsock is created and has some information, the accept | |
907 | * has not been done. | |
908 | */ | |
909 | static int apparmor_socket_accept(struct socket *sock, struct socket *newsock) | |
910 | { | |
911 | AA_BUG(!sock); | |
912 | AA_BUG(!sock->sk); | |
913 | AA_BUG(!newsock); | |
914 | AA_BUG(in_interrupt()); | |
915 | ||
916 | return af_select(sock->sk->sk_family, | |
917 | accept_perm(sock, newsock), | |
918 | aa_sk_perm(OP_ACCEPT, AA_MAY_ACCEPT, sock->sk)); | |
919 | } | |
920 | ||
921 | static int aa_sock_msg_perm(const char *op, u32 request, struct socket *sock, | |
922 | struct msghdr *msg, int size) | |
923 | { | |
924 | AA_BUG(!sock); | |
925 | AA_BUG(!sock->sk); | |
926 | AA_BUG(!msg); | |
927 | AA_BUG(in_interrupt()); | |
928 | ||
929 | return af_select(sock->sk->sk_family, | |
930 | msg_perm(op, request, sock, msg, size), | |
931 | aa_sk_perm(op, request, sock->sk)); | |
932 | } | |
933 | ||
934 | /** | |
935 | * apparmor_socket_sendmsg - check perms before sending msg to another socket | |
936 | */ | |
937 | static int apparmor_socket_sendmsg(struct socket *sock, | |
938 | struct msghdr *msg, int size) | |
939 | { | |
940 | return aa_sock_msg_perm(OP_SENDMSG, AA_MAY_SEND, sock, msg, size); | |
941 | } | |
942 | ||
943 | /** | |
944 | * apparmor_socket_recvmsg - check perms before receiving a message | |
945 | */ | |
946 | static int apparmor_socket_recvmsg(struct socket *sock, | |
947 | struct msghdr *msg, int size, int flags) | |
948 | { | |
949 | return aa_sock_msg_perm(OP_RECVMSG, AA_MAY_RECEIVE, sock, msg, size); | |
950 | } | |
951 | ||
952 | /* revaliation, get/set attr, shutdown */ | |
953 | static int aa_sock_perm(const char *op, u32 request, struct socket *sock) | |
954 | { | |
955 | AA_BUG(!sock); | |
956 | AA_BUG(!sock->sk); | |
957 | AA_BUG(in_interrupt()); | |
958 | ||
959 | return af_select(sock->sk->sk_family, | |
960 | sock_perm(op, request, sock), | |
961 | aa_sk_perm(op, request, sock->sk)); | |
962 | } | |
963 | ||
964 | /** | |
965 | * apparmor_socket_getsockname - check perms before getting the local address | |
966 | */ | |
967 | static int apparmor_socket_getsockname(struct socket *sock) | |
968 | { | |
969 | return aa_sock_perm(OP_GETSOCKNAME, AA_MAY_GETATTR, sock); | |
970 | } | |
971 | ||
972 | /** | |
973 | * apparmor_socket_getpeername - check perms before getting remote address | |
974 | */ | |
975 | static int apparmor_socket_getpeername(struct socket *sock) | |
976 | { | |
977 | return aa_sock_perm(OP_GETPEERNAME, AA_MAY_GETATTR, sock); | |
978 | } | |
979 | ||
980 | /* revaliation, get/set attr, opt */ | |
981 | static int aa_sock_opt_perm(const char *op, u32 request, struct socket *sock, | |
982 | int level, int optname) | |
983 | { | |
984 | AA_BUG(!sock); | |
985 | AA_BUG(!sock->sk); | |
986 | AA_BUG(in_interrupt()); | |
987 | ||
988 | return af_select(sock->sk->sk_family, | |
989 | opt_perm(op, request, sock, level, optname), | |
990 | aa_sk_perm(op, request, sock->sk)); | |
991 | } | |
992 | ||
993 | /** | |
994 | * apparmor_getsockopt - check perms before getting socket options | |
995 | */ | |
996 | static int apparmor_socket_getsockopt(struct socket *sock, int level, | |
997 | int optname) | |
998 | { | |
999 | return aa_sock_opt_perm(OP_GETSOCKOPT, AA_MAY_GETOPT, sock, | |
1000 | level, optname); | |
1001 | } | |
1002 | ||
1003 | /** | |
1004 | * apparmor_setsockopt - check perms before setting socket options | |
1005 | */ | |
1006 | static int apparmor_socket_setsockopt(struct socket *sock, int level, | |
1007 | int optname) | |
1008 | { | |
1009 | return aa_sock_opt_perm(OP_SETSOCKOPT, AA_MAY_SETOPT, sock, | |
1010 | level, optname); | |
1011 | } | |
1012 | ||
1013 | /** | |
1014 | * apparmor_socket_shutdown - check perms before shutting down @sock conn | |
1015 | */ | |
1016 | static int apparmor_socket_shutdown(struct socket *sock, int how) | |
1017 | { | |
1018 | return aa_sock_perm(OP_SHUTDOWN, AA_MAY_SHUTDOWN, sock); | |
1019 | } | |
1020 | ||
e1af4779 | 1021 | #ifdef CONFIG_NETWORK_SECMARK |
56974a6f JJ |
1022 | /** |
1023 | * apparmor_socket_sock_recv_skb - check perms before associating skb to sk | |
1024 | * | |
1025 | * Note: can not sleep may be called with locks held | |
1026 | * | |
1027 | * dont want protocol specific in __skb_recv_datagram() | |
1028 | * to deny an incoming connection socket_sock_rcv_skb() | |
1029 | */ | |
1030 | static int apparmor_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
1031 | { | |
ab9f2115 MG |
1032 | struct aa_sk_ctx *ctx = SK_CTX(sk); |
1033 | ||
1034 | if (!skb->secmark) | |
1035 | return 0; | |
1036 | ||
1037 | return apparmor_secmark_check(ctx->label, OP_RECVMSG, AA_MAY_RECEIVE, | |
1038 | skb->secmark, sk); | |
56974a6f | 1039 | } |
e1af4779 | 1040 | #endif |
56974a6f JJ |
1041 | |
1042 | ||
1043 | static struct aa_label *sk_peer_label(struct sock *sk) | |
1044 | { | |
1045 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
1046 | ||
1047 | if (ctx->peer) | |
1048 | return ctx->peer; | |
1049 | ||
1050 | return ERR_PTR(-ENOPROTOOPT); | |
1051 | } | |
1052 | ||
1053 | /** | |
1054 | * apparmor_socket_getpeersec_stream - get security context of peer | |
1055 | * | |
1056 | * Note: for tcp only valid if using ipsec or cipso on lan | |
1057 | */ | |
1058 | static int apparmor_socket_getpeersec_stream(struct socket *sock, | |
1059 | char __user *optval, | |
1060 | int __user *optlen, | |
1061 | unsigned int len) | |
1062 | { | |
1063 | char *name; | |
1064 | int slen, error = 0; | |
1065 | struct aa_label *label; | |
1066 | struct aa_label *peer; | |
1067 | ||
1068 | label = begin_current_label_crit_section(); | |
1069 | peer = sk_peer_label(sock->sk); | |
1070 | if (IS_ERR(peer)) { | |
1071 | error = PTR_ERR(peer); | |
1072 | goto done; | |
1073 | } | |
1074 | slen = aa_label_asxprint(&name, labels_ns(label), peer, | |
1075 | FLAG_SHOW_MODE | FLAG_VIEW_SUBNS | | |
1076 | FLAG_HIDDEN_UNCONFINED, GFP_KERNEL); | |
1077 | /* don't include terminating \0 in slen, it breaks some apps */ | |
1078 | if (slen < 0) { | |
1079 | error = -ENOMEM; | |
1080 | } else { | |
1081 | if (slen > len) { | |
1082 | error = -ERANGE; | |
1083 | } else if (copy_to_user(optval, name, slen)) { | |
1084 | error = -EFAULT; | |
1085 | goto out; | |
1086 | } | |
1087 | if (put_user(slen, optlen)) | |
1088 | error = -EFAULT; | |
1089 | out: | |
1090 | kfree(name); | |
1091 | ||
1092 | } | |
1093 | ||
1094 | done: | |
1095 | end_current_label_crit_section(label); | |
1096 | ||
1097 | return error; | |
1098 | } | |
1099 | ||
1100 | /** | |
1101 | * apparmor_socket_getpeersec_dgram - get security label of packet | |
1102 | * @sock: the peer socket | |
1103 | * @skb: packet data | |
1104 | * @secid: pointer to where to put the secid of the packet | |
1105 | * | |
1106 | * Sets the netlabel socket state on sk from parent | |
1107 | */ | |
1108 | static int apparmor_socket_getpeersec_dgram(struct socket *sock, | |
1109 | struct sk_buff *skb, u32 *secid) | |
1110 | ||
1111 | { | |
1112 | /* TODO: requires secid support */ | |
1113 | return -ENOPROTOOPT; | |
1114 | } | |
1115 | ||
1116 | /** | |
1117 | * apparmor_sock_graft - Initialize newly created socket | |
1118 | * @sk: child sock | |
1119 | * @parent: parent socket | |
1120 | * | |
1121 | * Note: could set off of SOCK_CTX(parent) but need to track inode and we can | |
1122 | * just set sk security information off of current creating process label | |
1123 | * Labeling of sk for accept case - probably should be sock based | |
1124 | * instead of task, because of the case where an implicitly labeled | |
1125 | * socket is shared by different tasks. | |
1126 | */ | |
1127 | static void apparmor_sock_graft(struct sock *sk, struct socket *parent) | |
1128 | { | |
1129 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
1130 | ||
1131 | if (!ctx->label) | |
1132 | ctx->label = aa_get_current_label(); | |
1133 | } | |
1134 | ||
e1af4779 | 1135 | #ifdef CONFIG_NETWORK_SECMARK |
ab9f2115 MG |
1136 | static int apparmor_inet_conn_request(struct sock *sk, struct sk_buff *skb, |
1137 | struct request_sock *req) | |
1138 | { | |
1139 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
1140 | ||
1141 | if (!skb->secmark) | |
1142 | return 0; | |
1143 | ||
1144 | return apparmor_secmark_check(ctx->label, OP_CONNECT, AA_MAY_CONNECT, | |
1145 | skb->secmark, sk); | |
1146 | } | |
e1af4779 | 1147 | #endif |
ab9f2115 | 1148 | |
bbd3662a CS |
1149 | /* |
1150 | * The cred blob is a pointer to, not an instance of, an aa_task_ctx. | |
1151 | */ | |
1152 | struct lsm_blob_sizes apparmor_blob_sizes __lsm_ro_after_init = { | |
1153 | .lbs_cred = sizeof(struct aa_task_ctx *), | |
33bf60ca | 1154 | .lbs_file = sizeof(struct aa_file_ctx), |
f4ad8f2c | 1155 | .lbs_task = sizeof(struct aa_task_ctx), |
bbd3662a CS |
1156 | }; |
1157 | ||
ca97d939 | 1158 | static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = { |
e20b043a CS |
1159 | LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check), |
1160 | LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme), | |
1161 | LSM_HOOK_INIT(capget, apparmor_capget), | |
1162 | LSM_HOOK_INIT(capable, apparmor_capable), | |
1163 | ||
2ea3ffb7 JJ |
1164 | LSM_HOOK_INIT(sb_mount, apparmor_sb_mount), |
1165 | LSM_HOOK_INIT(sb_umount, apparmor_sb_umount), | |
1166 | LSM_HOOK_INIT(sb_pivotroot, apparmor_sb_pivotroot), | |
1167 | ||
e20b043a CS |
1168 | LSM_HOOK_INIT(path_link, apparmor_path_link), |
1169 | LSM_HOOK_INIT(path_unlink, apparmor_path_unlink), | |
1170 | LSM_HOOK_INIT(path_symlink, apparmor_path_symlink), | |
1171 | LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir), | |
1172 | LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir), | |
1173 | LSM_HOOK_INIT(path_mknod, apparmor_path_mknod), | |
1174 | LSM_HOOK_INIT(path_rename, apparmor_path_rename), | |
1175 | LSM_HOOK_INIT(path_chmod, apparmor_path_chmod), | |
1176 | LSM_HOOK_INIT(path_chown, apparmor_path_chown), | |
1177 | LSM_HOOK_INIT(path_truncate, apparmor_path_truncate), | |
1178 | LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr), | |
1179 | ||
1180 | LSM_HOOK_INIT(file_open, apparmor_file_open), | |
064dc947 | 1181 | LSM_HOOK_INIT(file_receive, apparmor_file_receive), |
e20b043a CS |
1182 | LSM_HOOK_INIT(file_permission, apparmor_file_permission), |
1183 | LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security), | |
1184 | LSM_HOOK_INIT(file_free_security, apparmor_file_free_security), | |
1185 | LSM_HOOK_INIT(mmap_file, apparmor_mmap_file), | |
e20b043a CS |
1186 | LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect), |
1187 | LSM_HOOK_INIT(file_lock, apparmor_file_lock), | |
1188 | ||
1189 | LSM_HOOK_INIT(getprocattr, apparmor_getprocattr), | |
1190 | LSM_HOOK_INIT(setprocattr, apparmor_setprocattr), | |
1191 | ||
56974a6f JJ |
1192 | LSM_HOOK_INIT(sk_alloc_security, apparmor_sk_alloc_security), |
1193 | LSM_HOOK_INIT(sk_free_security, apparmor_sk_free_security), | |
1194 | LSM_HOOK_INIT(sk_clone_security, apparmor_sk_clone_security), | |
1195 | ||
1196 | LSM_HOOK_INIT(socket_create, apparmor_socket_create), | |
1197 | LSM_HOOK_INIT(socket_post_create, apparmor_socket_post_create), | |
1198 | LSM_HOOK_INIT(socket_bind, apparmor_socket_bind), | |
1199 | LSM_HOOK_INIT(socket_connect, apparmor_socket_connect), | |
1200 | LSM_HOOK_INIT(socket_listen, apparmor_socket_listen), | |
1201 | LSM_HOOK_INIT(socket_accept, apparmor_socket_accept), | |
1202 | LSM_HOOK_INIT(socket_sendmsg, apparmor_socket_sendmsg), | |
1203 | LSM_HOOK_INIT(socket_recvmsg, apparmor_socket_recvmsg), | |
1204 | LSM_HOOK_INIT(socket_getsockname, apparmor_socket_getsockname), | |
1205 | LSM_HOOK_INIT(socket_getpeername, apparmor_socket_getpeername), | |
1206 | LSM_HOOK_INIT(socket_getsockopt, apparmor_socket_getsockopt), | |
1207 | LSM_HOOK_INIT(socket_setsockopt, apparmor_socket_setsockopt), | |
1208 | LSM_HOOK_INIT(socket_shutdown, apparmor_socket_shutdown), | |
e1af4779 | 1209 | #ifdef CONFIG_NETWORK_SECMARK |
56974a6f | 1210 | LSM_HOOK_INIT(socket_sock_rcv_skb, apparmor_socket_sock_rcv_skb), |
e1af4779 | 1211 | #endif |
56974a6f JJ |
1212 | LSM_HOOK_INIT(socket_getpeersec_stream, |
1213 | apparmor_socket_getpeersec_stream), | |
1214 | LSM_HOOK_INIT(socket_getpeersec_dgram, | |
1215 | apparmor_socket_getpeersec_dgram), | |
1216 | LSM_HOOK_INIT(sock_graft, apparmor_sock_graft), | |
e1af4779 | 1217 | #ifdef CONFIG_NETWORK_SECMARK |
ab9f2115 | 1218 | LSM_HOOK_INIT(inet_conn_request, apparmor_inet_conn_request), |
e1af4779 | 1219 | #endif |
56974a6f | 1220 | |
e20b043a CS |
1221 | LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank), |
1222 | LSM_HOOK_INIT(cred_free, apparmor_cred_free), | |
1223 | LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare), | |
1224 | LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer), | |
1225 | ||
1226 | LSM_HOOK_INIT(bprm_set_creds, apparmor_bprm_set_creds), | |
1227 | LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds), | |
1228 | LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds), | |
e20b043a | 1229 | |
3b529a76 JJ |
1230 | LSM_HOOK_INIT(task_free, apparmor_task_free), |
1231 | LSM_HOOK_INIT(task_alloc, apparmor_task_alloc), | |
a7ae3645 | 1232 | LSM_HOOK_INIT(task_getsecid, apparmor_task_getsecid), |
e20b043a | 1233 | LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit), |
cd1dbf76 | 1234 | LSM_HOOK_INIT(task_kill, apparmor_task_kill), |
c0929212 | 1235 | |
e79c26d0 MG |
1236 | #ifdef CONFIG_AUDIT |
1237 | LSM_HOOK_INIT(audit_rule_init, aa_audit_rule_init), | |
1238 | LSM_HOOK_INIT(audit_rule_known, aa_audit_rule_known), | |
1239 | LSM_HOOK_INIT(audit_rule_match, aa_audit_rule_match), | |
1240 | LSM_HOOK_INIT(audit_rule_free, aa_audit_rule_free), | |
1241 | #endif | |
1242 | ||
c0929212 JJ |
1243 | LSM_HOOK_INIT(secid_to_secctx, apparmor_secid_to_secctx), |
1244 | LSM_HOOK_INIT(secctx_to_secid, apparmor_secctx_to_secid), | |
1245 | LSM_HOOK_INIT(release_secctx, apparmor_release_secctx), | |
b5e95b48 JJ |
1246 | }; |
1247 | ||
1248 | /* | |
1249 | * AppArmor sysfs module parameters | |
1250 | */ | |
1251 | ||
101d6c82 SR |
1252 | static int param_set_aabool(const char *val, const struct kernel_param *kp); |
1253 | static int param_get_aabool(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 1254 | #define param_check_aabool param_check_bool |
9c27847d | 1255 | static const struct kernel_param_ops param_ops_aabool = { |
6a4c2643 | 1256 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
1257 | .set = param_set_aabool, |
1258 | .get = param_get_aabool | |
1259 | }; | |
b5e95b48 | 1260 | |
101d6c82 SR |
1261 | static int param_set_aauint(const char *val, const struct kernel_param *kp); |
1262 | static int param_get_aauint(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 1263 | #define param_check_aauint param_check_uint |
9c27847d | 1264 | static const struct kernel_param_ops param_ops_aauint = { |
101d6c82 SR |
1265 | .set = param_set_aauint, |
1266 | .get = param_get_aauint | |
1267 | }; | |
b5e95b48 | 1268 | |
101d6c82 SR |
1269 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp); |
1270 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 1271 | #define param_check_aalockpolicy param_check_bool |
9c27847d | 1272 | static const struct kernel_param_ops param_ops_aalockpolicy = { |
6a4c2643 | 1273 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
1274 | .set = param_set_aalockpolicy, |
1275 | .get = param_get_aalockpolicy | |
1276 | }; | |
b5e95b48 | 1277 | |
e4dca7b7 KC |
1278 | static int param_set_audit(const char *val, const struct kernel_param *kp); |
1279 | static int param_get_audit(char *buffer, const struct kernel_param *kp); | |
b5e95b48 | 1280 | |
e4dca7b7 KC |
1281 | static int param_set_mode(const char *val, const struct kernel_param *kp); |
1282 | static int param_get_mode(char *buffer, const struct kernel_param *kp); | |
b5e95b48 JJ |
1283 | |
1284 | /* Flag values, also controllable via /sys/module/apparmor/parameters | |
1285 | * We define special types as we want to do additional mediation. | |
1286 | */ | |
1287 | ||
1288 | /* AppArmor global enforcement switch - complain, enforce, kill */ | |
1289 | enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE; | |
1290 | module_param_call(mode, param_set_mode, param_get_mode, | |
1291 | &aa_g_profile_mode, S_IRUSR | S_IWUSR); | |
1292 | ||
6059f71f | 1293 | /* whether policy verification hashing is enabled */ |
7616ac70 | 1294 | bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT); |
3ccb76c5 | 1295 | #ifdef CONFIG_SECURITY_APPARMOR_HASH |
6059f71f | 1296 | module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR); |
7616ac70 | 1297 | #endif |
6059f71f | 1298 | |
b5e95b48 | 1299 | /* Debug mode */ |
eea7a05f | 1300 | bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_APPARMOR_DEBUG_MESSAGES); |
b5e95b48 JJ |
1301 | module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR); |
1302 | ||
1303 | /* Audit mode */ | |
1304 | enum audit_mode aa_g_audit; | |
1305 | module_param_call(audit, param_set_audit, param_get_audit, | |
1306 | &aa_g_audit, S_IRUSR | S_IWUSR); | |
1307 | ||
1308 | /* Determines if audit header is included in audited messages. This | |
1309 | * provides more context if the audit daemon is not running | |
1310 | */ | |
954317fe | 1311 | bool aa_g_audit_header = true; |
b5e95b48 JJ |
1312 | module_param_named(audit_header, aa_g_audit_header, aabool, |
1313 | S_IRUSR | S_IWUSR); | |
1314 | ||
1315 | /* lock out loading/removal of policy | |
1316 | * TODO: add in at boot loading of policy, which is the only way to | |
1317 | * load policy, if lock_policy is set | |
1318 | */ | |
90ab5ee9 | 1319 | bool aa_g_lock_policy; |
b5e95b48 JJ |
1320 | module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy, |
1321 | S_IRUSR | S_IWUSR); | |
1322 | ||
1323 | /* Syscall logging mode */ | |
90ab5ee9 | 1324 | bool aa_g_logsyscall; |
b5e95b48 JJ |
1325 | module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR); |
1326 | ||
1327 | /* Maximum pathname length before accesses will start getting rejected */ | |
1328 | unsigned int aa_g_path_max = 2 * PATH_MAX; | |
622f6e32 | 1329 | module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR); |
b5e95b48 JJ |
1330 | |
1331 | /* Determines how paranoid loading of policy is and how much verification | |
1332 | * on the loaded policy is done. | |
abbf8734 JJ |
1333 | * DEPRECATED: read only as strict checking of load is always done now |
1334 | * that none root users (user namespaces) can load policy. | |
b5e95b48 | 1335 | */ |
954317fe | 1336 | bool aa_g_paranoid_load = true; |
abbf8734 | 1337 | module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO); |
b5e95b48 JJ |
1338 | |
1339 | /* Boot time disable flag */ | |
0102fb83 | 1340 | static int apparmor_enabled __lsm_ro_after_init = 1; |
c5459b82 | 1341 | module_param_named(enabled, apparmor_enabled, int, 0444); |
b5e95b48 JJ |
1342 | |
1343 | static int __init apparmor_enabled_setup(char *str) | |
1344 | { | |
1345 | unsigned long enabled; | |
29707b20 | 1346 | int error = kstrtoul(str, 0, &enabled); |
b5e95b48 JJ |
1347 | if (!error) |
1348 | apparmor_enabled = enabled ? 1 : 0; | |
1349 | return 1; | |
1350 | } | |
1351 | ||
1352 | __setup("apparmor=", apparmor_enabled_setup); | |
1353 | ||
1354 | /* set global flag turning off the ability to load policy */ | |
101d6c82 | 1355 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp) |
b5e95b48 | 1356 | { |
545de8fe JJ |
1357 | if (!apparmor_enabled) |
1358 | return -EINVAL; | |
1359 | if (apparmor_initialized && !policy_admin_capable(NULL)) | |
b5e95b48 | 1360 | return -EPERM; |
b5e95b48 JJ |
1361 | return param_set_bool(val, kp); |
1362 | } | |
1363 | ||
101d6c82 | 1364 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1365 | { |
ca4bd5ae JJ |
1366 | if (!apparmor_enabled) |
1367 | return -EINVAL; | |
545de8fe JJ |
1368 | if (apparmor_initialized && !policy_view_capable(NULL)) |
1369 | return -EPERM; | |
b5e95b48 JJ |
1370 | return param_get_bool(buffer, kp); |
1371 | } | |
1372 | ||
101d6c82 | 1373 | static int param_set_aabool(const char *val, const struct kernel_param *kp) |
b5e95b48 | 1374 | { |
ca4bd5ae JJ |
1375 | if (!apparmor_enabled) |
1376 | return -EINVAL; | |
545de8fe JJ |
1377 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
1378 | return -EPERM; | |
b5e95b48 JJ |
1379 | return param_set_bool(val, kp); |
1380 | } | |
1381 | ||
101d6c82 | 1382 | static int param_get_aabool(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1383 | { |
ca4bd5ae JJ |
1384 | if (!apparmor_enabled) |
1385 | return -EINVAL; | |
545de8fe JJ |
1386 | if (apparmor_initialized && !policy_view_capable(NULL)) |
1387 | return -EPERM; | |
b5e95b48 JJ |
1388 | return param_get_bool(buffer, kp); |
1389 | } | |
1390 | ||
101d6c82 | 1391 | static int param_set_aauint(const char *val, const struct kernel_param *kp) |
b5e95b48 | 1392 | { |
39d84824 JJ |
1393 | int error; |
1394 | ||
ca4bd5ae JJ |
1395 | if (!apparmor_enabled) |
1396 | return -EINVAL; | |
39d84824 JJ |
1397 | /* file is ro but enforce 2nd line check */ |
1398 | if (apparmor_initialized) | |
545de8fe | 1399 | return -EPERM; |
39d84824 JJ |
1400 | |
1401 | error = param_set_uint(val, kp); | |
1402 | pr_info("AppArmor: buffer size set to %d bytes\n", aa_g_path_max); | |
1403 | ||
1404 | return error; | |
b5e95b48 JJ |
1405 | } |
1406 | ||
101d6c82 | 1407 | static int param_get_aauint(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1408 | { |
ca4bd5ae JJ |
1409 | if (!apparmor_enabled) |
1410 | return -EINVAL; | |
545de8fe JJ |
1411 | if (apparmor_initialized && !policy_view_capable(NULL)) |
1412 | return -EPERM; | |
b5e95b48 JJ |
1413 | return param_get_uint(buffer, kp); |
1414 | } | |
1415 | ||
e4dca7b7 | 1416 | static int param_get_audit(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1417 | { |
b5e95b48 JJ |
1418 | if (!apparmor_enabled) |
1419 | return -EINVAL; | |
545de8fe JJ |
1420 | if (apparmor_initialized && !policy_view_capable(NULL)) |
1421 | return -EPERM; | |
b5e95b48 JJ |
1422 | return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]); |
1423 | } | |
1424 | ||
e4dca7b7 | 1425 | static int param_set_audit(const char *val, const struct kernel_param *kp) |
b5e95b48 JJ |
1426 | { |
1427 | int i; | |
b5e95b48 JJ |
1428 | |
1429 | if (!apparmor_enabled) | |
1430 | return -EINVAL; | |
b5e95b48 JJ |
1431 | if (!val) |
1432 | return -EINVAL; | |
545de8fe JJ |
1433 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
1434 | return -EPERM; | |
b5e95b48 | 1435 | |
5d8779a5 AS |
1436 | i = match_string(audit_mode_names, AUDIT_MAX_INDEX, val); |
1437 | if (i < 0) | |
1438 | return -EINVAL; | |
b5e95b48 | 1439 | |
5d8779a5 AS |
1440 | aa_g_audit = i; |
1441 | return 0; | |
b5e95b48 JJ |
1442 | } |
1443 | ||
e4dca7b7 | 1444 | static int param_get_mode(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1445 | { |
b5e95b48 JJ |
1446 | if (!apparmor_enabled) |
1447 | return -EINVAL; | |
545de8fe JJ |
1448 | if (apparmor_initialized && !policy_view_capable(NULL)) |
1449 | return -EPERM; | |
b5e95b48 | 1450 | |
0d259f04 | 1451 | return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]); |
b5e95b48 JJ |
1452 | } |
1453 | ||
e4dca7b7 | 1454 | static int param_set_mode(const char *val, const struct kernel_param *kp) |
b5e95b48 JJ |
1455 | { |
1456 | int i; | |
b5e95b48 JJ |
1457 | |
1458 | if (!apparmor_enabled) | |
1459 | return -EINVAL; | |
b5e95b48 JJ |
1460 | if (!val) |
1461 | return -EINVAL; | |
545de8fe JJ |
1462 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
1463 | return -EPERM; | |
b5e95b48 | 1464 | |
5d8779a5 AS |
1465 | i = match_string(aa_profile_mode_names, APPARMOR_MODE_NAMES_MAX_INDEX, |
1466 | val); | |
1467 | if (i < 0) | |
1468 | return -EINVAL; | |
b5e95b48 | 1469 | |
5d8779a5 AS |
1470 | aa_g_profile_mode = i; |
1471 | return 0; | |
b5e95b48 JJ |
1472 | } |
1473 | ||
1474 | /* | |
1475 | * AppArmor init functions | |
1476 | */ | |
1477 | ||
1478 | /** | |
55a26ebf | 1479 | * set_init_ctx - set a task context and profile on the first task. |
b5e95b48 JJ |
1480 | * |
1481 | * TODO: allow setting an alternate profile than unconfined | |
1482 | */ | |
55a26ebf | 1483 | static int __init set_init_ctx(void) |
b5e95b48 JJ |
1484 | { |
1485 | struct cred *cred = (struct cred *)current->real_cred; | |
b5e95b48 | 1486 | |
69b5a44a | 1487 | set_cred_label(cred, aa_get_label(ns_unconfined(root_ns))); |
b5e95b48 JJ |
1488 | |
1489 | return 0; | |
1490 | } | |
1491 | ||
d4669f0b JJ |
1492 | static void destroy_buffers(void) |
1493 | { | |
1494 | u32 i, j; | |
1495 | ||
1496 | for_each_possible_cpu(i) { | |
1497 | for_each_cpu_buffer(j) { | |
1498 | kfree(per_cpu(aa_buffers, i).buf[j]); | |
1499 | per_cpu(aa_buffers, i).buf[j] = NULL; | |
1500 | } | |
1501 | } | |
1502 | } | |
1503 | ||
1504 | static int __init alloc_buffers(void) | |
1505 | { | |
1506 | u32 i, j; | |
1507 | ||
1508 | for_each_possible_cpu(i) { | |
1509 | for_each_cpu_buffer(j) { | |
1510 | char *buffer; | |
1511 | ||
1512 | if (cpu_to_node(i) > num_online_nodes()) | |
1513 | /* fallback to kmalloc for offline nodes */ | |
1514 | buffer = kmalloc(aa_g_path_max, GFP_KERNEL); | |
1515 | else | |
1516 | buffer = kmalloc_node(aa_g_path_max, GFP_KERNEL, | |
1517 | cpu_to_node(i)); | |
1518 | if (!buffer) { | |
1519 | destroy_buffers(); | |
1520 | return -ENOMEM; | |
1521 | } | |
1522 | per_cpu(aa_buffers, i).buf[j] = buffer; | |
1523 | } | |
1524 | } | |
1525 | ||
1526 | return 0; | |
1527 | } | |
1528 | ||
e3ea1ca5 TH |
1529 | #ifdef CONFIG_SYSCTL |
1530 | static int apparmor_dointvec(struct ctl_table *table, int write, | |
1531 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1532 | { | |
1533 | if (!policy_admin_capable(NULL)) | |
1534 | return -EPERM; | |
1535 | if (!apparmor_enabled) | |
1536 | return -EINVAL; | |
1537 | ||
1538 | return proc_dointvec(table, write, buffer, lenp, ppos); | |
1539 | } | |
1540 | ||
1541 | static struct ctl_path apparmor_sysctl_path[] = { | |
1542 | { .procname = "kernel", }, | |
1543 | { } | |
1544 | }; | |
1545 | ||
1546 | static struct ctl_table apparmor_sysctl_table[] = { | |
1547 | { | |
1548 | .procname = "unprivileged_userns_apparmor_policy", | |
1549 | .data = &unprivileged_userns_apparmor_policy, | |
1550 | .maxlen = sizeof(int), | |
1551 | .mode = 0600, | |
1552 | .proc_handler = apparmor_dointvec, | |
1553 | }, | |
1554 | { } | |
1555 | }; | |
1556 | ||
1557 | static int __init apparmor_init_sysctl(void) | |
1558 | { | |
1559 | return register_sysctl_paths(apparmor_sysctl_path, | |
1560 | apparmor_sysctl_table) ? 0 : -ENOMEM; | |
1561 | } | |
1562 | #else | |
1563 | static inline int apparmor_init_sysctl(void) | |
1564 | { | |
1565 | return 0; | |
1566 | } | |
1567 | #endif /* CONFIG_SYSCTL */ | |
1568 | ||
e1af4779 | 1569 | #if defined(CONFIG_NETFILTER) && defined(CONFIG_NETWORK_SECMARK) |
ab9f2115 MG |
1570 | static unsigned int apparmor_ip_postroute(void *priv, |
1571 | struct sk_buff *skb, | |
1572 | const struct nf_hook_state *state) | |
1573 | { | |
1574 | struct aa_sk_ctx *ctx; | |
1575 | struct sock *sk; | |
1576 | ||
1577 | if (!skb->secmark) | |
1578 | return NF_ACCEPT; | |
1579 | ||
1580 | sk = skb_to_full_sk(skb); | |
1581 | if (sk == NULL) | |
1582 | return NF_ACCEPT; | |
1583 | ||
1584 | ctx = SK_CTX(sk); | |
1585 | if (!apparmor_secmark_check(ctx->label, OP_SENDMSG, AA_MAY_SEND, | |
1586 | skb->secmark, sk)) | |
1587 | return NF_ACCEPT; | |
1588 | ||
1589 | return NF_DROP_ERR(-ECONNREFUSED); | |
1590 | ||
1591 | } | |
1592 | ||
1593 | static unsigned int apparmor_ipv4_postroute(void *priv, | |
1594 | struct sk_buff *skb, | |
1595 | const struct nf_hook_state *state) | |
1596 | { | |
1597 | return apparmor_ip_postroute(priv, skb, state); | |
1598 | } | |
1599 | ||
a1a02062 | 1600 | #if IS_ENABLED(CONFIG_IPV6) |
ab9f2115 MG |
1601 | static unsigned int apparmor_ipv6_postroute(void *priv, |
1602 | struct sk_buff *skb, | |
1603 | const struct nf_hook_state *state) | |
1604 | { | |
1605 | return apparmor_ip_postroute(priv, skb, state); | |
1606 | } | |
a1a02062 | 1607 | #endif |
ab9f2115 MG |
1608 | |
1609 | static const struct nf_hook_ops apparmor_nf_ops[] = { | |
1610 | { | |
1611 | .hook = apparmor_ipv4_postroute, | |
1612 | .pf = NFPROTO_IPV4, | |
1613 | .hooknum = NF_INET_POST_ROUTING, | |
1614 | .priority = NF_IP_PRI_SELINUX_FIRST, | |
1615 | }, | |
1616 | #if IS_ENABLED(CONFIG_IPV6) | |
1617 | { | |
1618 | .hook = apparmor_ipv6_postroute, | |
1619 | .pf = NFPROTO_IPV6, | |
1620 | .hooknum = NF_INET_POST_ROUTING, | |
1621 | .priority = NF_IP6_PRI_SELINUX_FIRST, | |
1622 | }, | |
1623 | #endif | |
1624 | }; | |
1625 | ||
1626 | static int __net_init apparmor_nf_register(struct net *net) | |
1627 | { | |
1628 | int ret; | |
1629 | ||
1630 | ret = nf_register_net_hooks(net, apparmor_nf_ops, | |
1631 | ARRAY_SIZE(apparmor_nf_ops)); | |
1632 | return ret; | |
1633 | } | |
1634 | ||
1635 | static void __net_exit apparmor_nf_unregister(struct net *net) | |
1636 | { | |
1637 | nf_unregister_net_hooks(net, apparmor_nf_ops, | |
1638 | ARRAY_SIZE(apparmor_nf_ops)); | |
1639 | } | |
1640 | ||
1641 | static struct pernet_operations apparmor_net_ops = { | |
1642 | .init = apparmor_nf_register, | |
1643 | .exit = apparmor_nf_unregister, | |
1644 | }; | |
1645 | ||
1646 | static int __init apparmor_nf_ip_init(void) | |
1647 | { | |
1648 | int err; | |
1649 | ||
1650 | if (!apparmor_enabled) | |
1651 | return 0; | |
1652 | ||
1653 | err = register_pernet_subsys(&apparmor_net_ops); | |
1654 | if (err) | |
1655 | panic("Apparmor: register_pernet_subsys: error %d\n", err); | |
1656 | ||
1657 | return 0; | |
1658 | } | |
1659 | __initcall(apparmor_nf_ip_init); | |
e1af4779 | 1660 | #endif |
ab9f2115 | 1661 | |
b5e95b48 JJ |
1662 | static int __init apparmor_init(void) |
1663 | { | |
1664 | int error; | |
1665 | ||
a4c3f89c JJ |
1666 | aa_secids_init(); |
1667 | ||
11c236b8 JJ |
1668 | error = aa_setup_dfa_engine(); |
1669 | if (error) { | |
1670 | AA_ERROR("Unable to setup dfa engine\n"); | |
1671 | goto alloc_out; | |
1672 | } | |
1673 | ||
b5e95b48 JJ |
1674 | error = aa_alloc_root_ns(); |
1675 | if (error) { | |
1676 | AA_ERROR("Unable to allocate default profile namespace\n"); | |
1677 | goto alloc_out; | |
1678 | } | |
1679 | ||
e3ea1ca5 TH |
1680 | error = apparmor_init_sysctl(); |
1681 | if (error) { | |
1682 | AA_ERROR("Unable to register sysctls\n"); | |
1683 | goto alloc_out; | |
1684 | ||
1685 | } | |
1686 | ||
d4669f0b JJ |
1687 | error = alloc_buffers(); |
1688 | if (error) { | |
1689 | AA_ERROR("Unable to allocate work buffers\n"); | |
1690 | goto buffers_out; | |
1691 | } | |
1692 | ||
55a26ebf | 1693 | error = set_init_ctx(); |
b5e95b48 JJ |
1694 | if (error) { |
1695 | AA_ERROR("Failed to set context on init task\n"); | |
b1d9e6b0 | 1696 | aa_free_root_ns(); |
d4669f0b | 1697 | goto buffers_out; |
b5e95b48 | 1698 | } |
d69dece5 CS |
1699 | security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks), |
1700 | "apparmor"); | |
b5e95b48 JJ |
1701 | |
1702 | /* Report that AppArmor successfully initialized */ | |
1703 | apparmor_initialized = 1; | |
1704 | if (aa_g_profile_mode == APPARMOR_COMPLAIN) | |
1705 | aa_info_message("AppArmor initialized: complain mode enabled"); | |
1706 | else if (aa_g_profile_mode == APPARMOR_KILL) | |
1707 | aa_info_message("AppArmor initialized: kill mode enabled"); | |
1708 | else | |
1709 | aa_info_message("AppArmor initialized"); | |
1710 | ||
1711 | return error; | |
1712 | ||
d4669f0b JJ |
1713 | buffers_out: |
1714 | destroy_buffers(); | |
1715 | ||
b5e95b48 JJ |
1716 | alloc_out: |
1717 | aa_destroy_aafs(); | |
11c236b8 | 1718 | aa_teardown_dfa_engine(); |
b5e95b48 | 1719 | |
954317fe | 1720 | apparmor_enabled = false; |
b5e95b48 | 1721 | return error; |
b5e95b48 JJ |
1722 | } |
1723 | ||
3d6e5f6d | 1724 | DEFINE_LSM(apparmor) = { |
07aed2f2 | 1725 | .name = "apparmor", |
14bd99c8 | 1726 | .flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE, |
c5459b82 | 1727 | .enabled = &apparmor_enabled, |
bbd3662a | 1728 | .blobs = &apparmor_blob_sizes, |
3d6e5f6d KC |
1729 | .init = apparmor_init, |
1730 | }; |