Commit | Line | Data |
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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> | |
b5e95b48 | 24 | #include <net/sock.h> |
e262e32d | 25 | #include <uapi/linux/mount.h> |
b5e95b48 JJ |
26 | |
27 | #include "include/apparmor.h" | |
28 | #include "include/apparmorfs.h" | |
29 | #include "include/audit.h" | |
30 | #include "include/capability.h" | |
d8889d49 | 31 | #include "include/cred.h" |
b5e95b48 JJ |
32 | #include "include/file.h" |
33 | #include "include/ipc.h" | |
56974a6f | 34 | #include "include/net.h" |
b5e95b48 | 35 | #include "include/path.h" |
637f688d | 36 | #include "include/label.h" |
b5e95b48 | 37 | #include "include/policy.h" |
cff281f6 | 38 | #include "include/policy_ns.h" |
b5e95b48 | 39 | #include "include/procattr.h" |
2ea3ffb7 | 40 | #include "include/mount.h" |
c0929212 | 41 | #include "include/secid.h" |
b5e95b48 JJ |
42 | |
43 | /* Flag indicating whether initialization completed */ | |
545de8fe | 44 | int apparmor_initialized; |
b5e95b48 | 45 | |
d4669f0b JJ |
46 | DEFINE_PER_CPU(struct aa_buffers, aa_buffers); |
47 | ||
48 | ||
b5e95b48 JJ |
49 | /* |
50 | * LSM hook functions | |
51 | */ | |
52 | ||
53 | /* | |
d9087c49 | 54 | * put the associated labels |
b5e95b48 JJ |
55 | */ |
56 | static void apparmor_cred_free(struct cred *cred) | |
57 | { | |
d9087c49 | 58 | aa_put_label(cred_label(cred)); |
69b5a44a | 59 | set_cred_label(cred, NULL); |
b5e95b48 JJ |
60 | } |
61 | ||
62 | /* | |
63 | * allocate the apparmor part of blank credentials | |
64 | */ | |
65 | static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
66 | { | |
69b5a44a | 67 | set_cred_label(cred, NULL); |
b5e95b48 JJ |
68 | return 0; |
69 | } | |
70 | ||
71 | /* | |
d9087c49 | 72 | * prepare new cred label for modification by prepare_cred block |
b5e95b48 JJ |
73 | */ |
74 | static int apparmor_cred_prepare(struct cred *new, const struct cred *old, | |
75 | gfp_t gfp) | |
76 | { | |
69b5a44a | 77 | set_cred_label(new, aa_get_newest_label(cred_label(old))); |
b5e95b48 JJ |
78 | return 0; |
79 | } | |
80 | ||
81 | /* | |
82 | * transfer the apparmor data to a blank set of creds | |
83 | */ | |
84 | static void apparmor_cred_transfer(struct cred *new, const struct cred *old) | |
85 | { | |
69b5a44a | 86 | set_cred_label(new, aa_get_newest_label(cred_label(old))); |
b5e95b48 JJ |
87 | } |
88 | ||
3b529a76 JJ |
89 | static void apparmor_task_free(struct task_struct *task) |
90 | { | |
91 | ||
92 | aa_free_task_ctx(task_ctx(task)); | |
3b529a76 JJ |
93 | } |
94 | ||
95 | static int apparmor_task_alloc(struct task_struct *task, | |
96 | unsigned long clone_flags) | |
97 | { | |
f4ad8f2c | 98 | struct aa_task_ctx *new = task_ctx(task); |
3b529a76 | 99 | |
de62de59 | 100 | aa_dup_task_ctx(new, task_ctx(current)); |
b5e95b48 | 101 | |
3b529a76 | 102 | return 0; |
b5e95b48 JJ |
103 | } |
104 | ||
105 | static int apparmor_ptrace_access_check(struct task_struct *child, | |
106 | unsigned int mode) | |
107 | { | |
b2d09ae4 JJ |
108 | struct aa_label *tracer, *tracee; |
109 | int error; | |
110 | ||
1f8266ff | 111 | tracer = __begin_current_label_crit_section(); |
b2d09ae4 JJ |
112 | tracee = aa_get_task_label(child); |
113 | error = aa_may_ptrace(tracer, tracee, | |
338d0be4 JJ |
114 | (mode & PTRACE_MODE_READ) ? AA_PTRACE_READ |
115 | : AA_PTRACE_TRACE); | |
b2d09ae4 | 116 | aa_put_label(tracee); |
1f8266ff | 117 | __end_current_label_crit_section(tracer); |
b2d09ae4 JJ |
118 | |
119 | return error; | |
b5e95b48 JJ |
120 | } |
121 | ||
122 | static int apparmor_ptrace_traceme(struct task_struct *parent) | |
123 | { | |
b2d09ae4 JJ |
124 | struct aa_label *tracer, *tracee; |
125 | int error; | |
126 | ||
ca3fde52 | 127 | tracee = __begin_current_label_crit_section(); |
b2d09ae4 JJ |
128 | tracer = aa_get_task_label(parent); |
129 | error = aa_may_ptrace(tracer, tracee, AA_PTRACE_TRACE); | |
130 | aa_put_label(tracer); | |
ca3fde52 | 131 | __end_current_label_crit_section(tracee); |
b2d09ae4 JJ |
132 | |
133 | return error; | |
b5e95b48 JJ |
134 | } |
135 | ||
136 | /* Derived from security/commoncap.c:cap_capget */ | |
137 | static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective, | |
138 | kernel_cap_t *inheritable, kernel_cap_t *permitted) | |
139 | { | |
637f688d | 140 | struct aa_label *label; |
b5e95b48 JJ |
141 | const struct cred *cred; |
142 | ||
143 | rcu_read_lock(); | |
144 | cred = __task_cred(target); | |
637f688d | 145 | label = aa_get_newest_cred_label(cred); |
c70c86c4 | 146 | |
b1d9e6b0 CS |
147 | /* |
148 | * cap_capget is stacked ahead of this and will | |
149 | * initialize effective and permitted. | |
150 | */ | |
c70c86c4 JJ |
151 | if (!unconfined(label)) { |
152 | struct aa_profile *profile; | |
153 | struct label_it i; | |
154 | ||
155 | label_for_each_confined(i, label, profile) { | |
156 | if (COMPLAIN_MODE(profile)) | |
157 | continue; | |
158 | *effective = cap_intersect(*effective, | |
159 | profile->caps.allow); | |
160 | *permitted = cap_intersect(*permitted, | |
161 | profile->caps.allow); | |
162 | } | |
b5e95b48 JJ |
163 | } |
164 | rcu_read_unlock(); | |
637f688d | 165 | aa_put_label(label); |
b5e95b48 JJ |
166 | |
167 | return 0; | |
168 | } | |
169 | ||
6a9de491 | 170 | static int apparmor_capable(const struct cred *cred, struct user_namespace *ns, |
c1a85a00 | 171 | int cap, unsigned int opts) |
b5e95b48 | 172 | { |
637f688d | 173 | struct aa_label *label; |
b1d9e6b0 CS |
174 | int error = 0; |
175 | ||
637f688d JJ |
176 | label = aa_get_newest_cred_label(cred); |
177 | if (!unconfined(label)) | |
c1a85a00 | 178 | error = aa_capable(label, cap, opts); |
637f688d | 179 | aa_put_label(label); |
cf797c0e | 180 | |
b5e95b48 JJ |
181 | return error; |
182 | } | |
183 | ||
184 | /** | |
185 | * common_perm - basic common permission check wrapper fn for paths | |
186 | * @op: operation being checked | |
187 | * @path: path to check permission of (NOT NULL) | |
188 | * @mask: requested permissions mask | |
189 | * @cond: conditional info for the permission request (NOT NULL) | |
190 | * | |
191 | * Returns: %0 else error code if error or permission denied | |
192 | */ | |
47f6e5cc | 193 | static int common_perm(const char *op, const struct path *path, u32 mask, |
b5e95b48 JJ |
194 | struct path_cond *cond) |
195 | { | |
637f688d | 196 | struct aa_label *label; |
b5e95b48 JJ |
197 | int error = 0; |
198 | ||
637f688d JJ |
199 | label = __begin_current_label_crit_section(); |
200 | if (!unconfined(label)) | |
aebd873e | 201 | error = aa_path_perm(op, label, path, 0, mask, cond); |
637f688d | 202 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
203 | |
204 | return error; | |
205 | } | |
206 | ||
207 | /** | |
31f75bfe | 208 | * common_perm_cond - common permission wrapper around inode cond |
b5e95b48 | 209 | * @op: operation being checked |
31f75bfe | 210 | * @path: location to check (NOT NULL) |
b5e95b48 | 211 | * @mask: requested permissions mask |
b5e95b48 JJ |
212 | * |
213 | * Returns: %0 else error code if error or permission denied | |
214 | */ | |
31f75bfe | 215 | static int common_perm_cond(const char *op, const struct path *path, u32 mask) |
b5e95b48 | 216 | { |
31f75bfe JJ |
217 | struct path_cond cond = { d_backing_inode(path->dentry)->i_uid, |
218 | d_backing_inode(path->dentry)->i_mode | |
219 | }; | |
b5e95b48 | 220 | |
31f75bfe JJ |
221 | if (!path_mediated_fs(path->dentry)) |
222 | return 0; | |
223 | ||
224 | return common_perm(op, path, mask, &cond); | |
b5e95b48 JJ |
225 | } |
226 | ||
227 | /** | |
31f75bfe | 228 | * common_perm_dir_dentry - common permission wrapper when path is dir, dentry |
b5e95b48 | 229 | * @op: operation being checked |
31f75bfe JJ |
230 | * @dir: directory of the dentry (NOT NULL) |
231 | * @dentry: dentry to check (NOT NULL) | |
b5e95b48 | 232 | * @mask: requested permissions mask |
31f75bfe | 233 | * @cond: conditional info for the permission request (NOT NULL) |
b5e95b48 JJ |
234 | * |
235 | * Returns: %0 else error code if error or permission denied | |
236 | */ | |
31f75bfe JJ |
237 | static int common_perm_dir_dentry(const char *op, const struct path *dir, |
238 | struct dentry *dentry, u32 mask, | |
239 | struct path_cond *cond) | |
b5e95b48 | 240 | { |
31f75bfe | 241 | struct path path = { .mnt = dir->mnt, .dentry = dentry }; |
b5e95b48 | 242 | |
31f75bfe | 243 | return common_perm(op, &path, mask, cond); |
b5e95b48 JJ |
244 | } |
245 | ||
246 | /** | |
247 | * common_perm_rm - common permission wrapper for operations doing rm | |
248 | * @op: operation being checked | |
249 | * @dir: directory that the dentry is in (NOT NULL) | |
250 | * @dentry: dentry being rm'd (NOT NULL) | |
251 | * @mask: requested permission mask | |
252 | * | |
253 | * Returns: %0 else error code if error or permission denied | |
254 | */ | |
47f6e5cc | 255 | static int common_perm_rm(const char *op, const struct path *dir, |
b5e95b48 JJ |
256 | struct dentry *dentry, u32 mask) |
257 | { | |
c6f493d6 | 258 | struct inode *inode = d_backing_inode(dentry); |
b5e95b48 JJ |
259 | struct path_cond cond = { }; |
260 | ||
efeee83a | 261 | if (!inode || !path_mediated_fs(dentry)) |
b5e95b48 JJ |
262 | return 0; |
263 | ||
264 | cond.uid = inode->i_uid; | |
265 | cond.mode = inode->i_mode; | |
266 | ||
267 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
268 | } | |
269 | ||
270 | /** | |
271 | * common_perm_create - common permission wrapper for operations doing create | |
272 | * @op: operation being checked | |
273 | * @dir: directory that dentry will be created in (NOT NULL) | |
274 | * @dentry: dentry to create (NOT NULL) | |
275 | * @mask: request permission mask | |
276 | * @mode: created file mode | |
277 | * | |
278 | * Returns: %0 else error code if error or permission denied | |
279 | */ | |
47f6e5cc | 280 | static int common_perm_create(const char *op, const struct path *dir, |
d6b49f7a | 281 | struct dentry *dentry, u32 mask, umode_t mode) |
b5e95b48 JJ |
282 | { |
283 | struct path_cond cond = { current_fsuid(), mode }; | |
284 | ||
efeee83a | 285 | if (!path_mediated_fs(dir->dentry)) |
b5e95b48 JJ |
286 | return 0; |
287 | ||
288 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
289 | } | |
290 | ||
989f74e0 | 291 | static int apparmor_path_unlink(const struct path *dir, struct dentry *dentry) |
b5e95b48 JJ |
292 | { |
293 | return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE); | |
294 | } | |
295 | ||
d3607752 | 296 | static int apparmor_path_mkdir(const struct path *dir, struct dentry *dentry, |
4572befe | 297 | umode_t mode) |
b5e95b48 JJ |
298 | { |
299 | return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE, | |
300 | S_IFDIR); | |
301 | } | |
302 | ||
989f74e0 | 303 | static int apparmor_path_rmdir(const struct path *dir, struct dentry *dentry) |
b5e95b48 JJ |
304 | { |
305 | return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE); | |
306 | } | |
307 | ||
d3607752 | 308 | static int apparmor_path_mknod(const struct path *dir, struct dentry *dentry, |
04fc66e7 | 309 | umode_t mode, unsigned int dev) |
b5e95b48 JJ |
310 | { |
311 | return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode); | |
312 | } | |
313 | ||
81f4c506 | 314 | static int apparmor_path_truncate(const struct path *path) |
b5e95b48 | 315 | { |
e53cfe6c | 316 | return common_perm_cond(OP_TRUNC, path, MAY_WRITE | AA_MAY_SETATTR); |
b5e95b48 JJ |
317 | } |
318 | ||
d3607752 | 319 | static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry, |
b5e95b48 JJ |
320 | const char *old_name) |
321 | { | |
322 | return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE, | |
323 | S_IFLNK); | |
324 | } | |
325 | ||
3ccee46a | 326 | static int apparmor_path_link(struct dentry *old_dentry, const struct path *new_dir, |
b5e95b48 JJ |
327 | struct dentry *new_dentry) |
328 | { | |
637f688d | 329 | struct aa_label *label; |
b5e95b48 JJ |
330 | int error = 0; |
331 | ||
efeee83a | 332 | if (!path_mediated_fs(old_dentry)) |
b5e95b48 JJ |
333 | return 0; |
334 | ||
637f688d JJ |
335 | label = begin_current_label_crit_section(); |
336 | if (!unconfined(label)) | |
8014370f | 337 | error = aa_path_link(label, old_dentry, new_dir, new_dentry); |
637f688d | 338 | end_current_label_crit_section(label); |
cf797c0e | 339 | |
b5e95b48 JJ |
340 | return error; |
341 | } | |
342 | ||
3ccee46a AV |
343 | static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry, |
344 | const struct path *new_dir, struct dentry *new_dentry) | |
b5e95b48 | 345 | { |
637f688d | 346 | struct aa_label *label; |
b5e95b48 JJ |
347 | int error = 0; |
348 | ||
efeee83a | 349 | if (!path_mediated_fs(old_dentry)) |
b5e95b48 JJ |
350 | return 0; |
351 | ||
637f688d JJ |
352 | label = begin_current_label_crit_section(); |
353 | if (!unconfined(label)) { | |
8486adf0 KC |
354 | struct path old_path = { .mnt = old_dir->mnt, |
355 | .dentry = old_dentry }; | |
356 | struct path new_path = { .mnt = new_dir->mnt, | |
357 | .dentry = new_dentry }; | |
c6f493d6 DH |
358 | struct path_cond cond = { d_backing_inode(old_dentry)->i_uid, |
359 | d_backing_inode(old_dentry)->i_mode | |
b5e95b48 JJ |
360 | }; |
361 | ||
aebd873e | 362 | error = aa_path_perm(OP_RENAME_SRC, label, &old_path, 0, |
e53cfe6c JJ |
363 | MAY_READ | AA_MAY_GETATTR | MAY_WRITE | |
364 | AA_MAY_SETATTR | AA_MAY_DELETE, | |
b5e95b48 JJ |
365 | &cond); |
366 | if (!error) | |
aebd873e | 367 | error = aa_path_perm(OP_RENAME_DEST, label, &new_path, |
e53cfe6c | 368 | 0, MAY_WRITE | AA_MAY_SETATTR | |
b5e95b48 JJ |
369 | AA_MAY_CREATE, &cond); |
370 | ||
371 | } | |
637f688d | 372 | end_current_label_crit_section(label); |
cf797c0e | 373 | |
b5e95b48 JJ |
374 | return error; |
375 | } | |
376 | ||
be01f9f2 | 377 | static int apparmor_path_chmod(const struct path *path, umode_t mode) |
b5e95b48 | 378 | { |
31f75bfe | 379 | return common_perm_cond(OP_CHMOD, path, AA_MAY_CHMOD); |
b5e95b48 JJ |
380 | } |
381 | ||
7fd25dac | 382 | static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid) |
b5e95b48 | 383 | { |
31f75bfe | 384 | return common_perm_cond(OP_CHOWN, path, AA_MAY_CHOWN); |
b5e95b48 JJ |
385 | } |
386 | ||
3f7036a0 | 387 | static int apparmor_inode_getattr(const struct path *path) |
b5e95b48 | 388 | { |
e53cfe6c | 389 | return common_perm_cond(OP_GETATTR, path, AA_MAY_GETATTR); |
b5e95b48 JJ |
390 | } |
391 | ||
94817692 | 392 | static int apparmor_file_open(struct file *file) |
b5e95b48 | 393 | { |
637f688d JJ |
394 | struct aa_file_ctx *fctx = file_ctx(file); |
395 | struct aa_label *label; | |
b5e95b48 JJ |
396 | int error = 0; |
397 | ||
efeee83a | 398 | if (!path_mediated_fs(file->f_path.dentry)) |
b5e95b48 JJ |
399 | return 0; |
400 | ||
401 | /* If in exec, permission is handled by bprm hooks. | |
402 | * Cache permissions granted by the previous exec check, with | |
403 | * implicit read and executable mmap which are required to | |
404 | * actually execute the image. | |
405 | */ | |
406 | if (current->in_execve) { | |
55a26ebf | 407 | fctx->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP; |
b5e95b48 JJ |
408 | return 0; |
409 | } | |
410 | ||
94817692 | 411 | label = aa_get_newest_cred_label(file->f_cred); |
637f688d | 412 | if (!unconfined(label)) { |
496ad9aa | 413 | struct inode *inode = file_inode(file); |
b5e95b48 JJ |
414 | struct path_cond cond = { inode->i_uid, inode->i_mode }; |
415 | ||
aebd873e | 416 | error = aa_path_perm(OP_OPEN, label, &file->f_path, 0, |
b5e95b48 JJ |
417 | aa_map_file_to_perms(file), &cond); |
418 | /* todo cache full allowed permissions set and state */ | |
55a26ebf | 419 | fctx->allow = aa_map_file_to_perms(file); |
b5e95b48 | 420 | } |
637f688d | 421 | aa_put_label(label); |
b5e95b48 JJ |
422 | |
423 | return error; | |
424 | } | |
425 | ||
426 | static int apparmor_file_alloc_security(struct file *file) | |
427 | { | |
33bf60ca | 428 | struct aa_file_ctx *ctx = file_ctx(file); |
637f688d | 429 | struct aa_label *label = begin_current_label_crit_section(); |
b5e95b48 | 430 | |
33bf60ca CS |
431 | spin_lock_init(&ctx->lock); |
432 | rcu_assign_pointer(ctx->label, aa_get_label(label)); | |
433 | end_current_label_crit_section(label); | |
434 | return 0; | |
b5e95b48 JJ |
435 | } |
436 | ||
437 | static void apparmor_file_free_security(struct file *file) | |
438 | { | |
33bf60ca CS |
439 | struct aa_file_ctx *ctx = file_ctx(file); |
440 | ||
441 | if (ctx) | |
442 | aa_put_label(rcu_access_pointer(ctx->label)); | |
b5e95b48 JJ |
443 | } |
444 | ||
47f6e5cc | 445 | static int common_file_perm(const char *op, struct file *file, u32 mask) |
b5e95b48 | 446 | { |
190a9518 | 447 | struct aa_label *label; |
b5e95b48 JJ |
448 | int error = 0; |
449 | ||
192ca6b5 JJ |
450 | /* don't reaudit files closed during inheritance */ |
451 | if (file->f_path.dentry == aa_null.dentry) | |
452 | return -EACCES; | |
453 | ||
637f688d | 454 | label = __begin_current_label_crit_section(); |
190a9518 | 455 | error = aa_file_perm(op, label, file, mask); |
637f688d | 456 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
457 | |
458 | return error; | |
459 | } | |
460 | ||
064dc947 JJ |
461 | static int apparmor_file_receive(struct file *file) |
462 | { | |
463 | return common_file_perm(OP_FRECEIVE, file, aa_map_file_to_perms(file)); | |
464 | } | |
465 | ||
b5e95b48 JJ |
466 | static int apparmor_file_permission(struct file *file, int mask) |
467 | { | |
468 | return common_file_perm(OP_FPERM, file, mask); | |
469 | } | |
470 | ||
471 | static int apparmor_file_lock(struct file *file, unsigned int cmd) | |
472 | { | |
473 | u32 mask = AA_MAY_LOCK; | |
474 | ||
475 | if (cmd == F_WRLCK) | |
476 | mask |= MAY_WRITE; | |
477 | ||
478 | return common_file_perm(OP_FLOCK, file, mask); | |
479 | } | |
480 | ||
47f6e5cc | 481 | static int common_mmap(const char *op, struct file *file, unsigned long prot, |
b5e95b48 JJ |
482 | unsigned long flags) |
483 | { | |
b5e95b48 JJ |
484 | int mask = 0; |
485 | ||
637f688d | 486 | if (!file || !file_ctx(file)) |
b5e95b48 JJ |
487 | return 0; |
488 | ||
489 | if (prot & PROT_READ) | |
490 | mask |= MAY_READ; | |
491 | /* | |
492 | * Private mappings don't require write perms since they don't | |
493 | * write back to the files | |
494 | */ | |
495 | if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE)) | |
496 | mask |= MAY_WRITE; | |
497 | if (prot & PROT_EXEC) | |
498 | mask |= AA_EXEC_MMAP; | |
499 | ||
b5e95b48 JJ |
500 | return common_file_perm(op, file, mask); |
501 | } | |
502 | ||
e5467859 AV |
503 | static int apparmor_mmap_file(struct file *file, unsigned long reqprot, |
504 | unsigned long prot, unsigned long flags) | |
b5e95b48 | 505 | { |
b5e95b48 JJ |
506 | return common_mmap(OP_FMMAP, file, prot, flags); |
507 | } | |
508 | ||
509 | static int apparmor_file_mprotect(struct vm_area_struct *vma, | |
510 | unsigned long reqprot, unsigned long prot) | |
511 | { | |
512 | return common_mmap(OP_FMPROT, vma->vm_file, prot, | |
513 | !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0); | |
514 | } | |
515 | ||
2ea3ffb7 JJ |
516 | static int apparmor_sb_mount(const char *dev_name, const struct path *path, |
517 | const char *type, unsigned long flags, void *data) | |
518 | { | |
519 | struct aa_label *label; | |
520 | int error = 0; | |
521 | ||
522 | /* Discard magic */ | |
523 | if ((flags & MS_MGC_MSK) == MS_MGC_VAL) | |
524 | flags &= ~MS_MGC_MSK; | |
525 | ||
526 | flags &= ~AA_MS_IGNORE_MASK; | |
527 | ||
528 | label = __begin_current_label_crit_section(); | |
529 | if (!unconfined(label)) { | |
530 | if (flags & MS_REMOUNT) | |
531 | error = aa_remount(label, path, flags, data); | |
532 | else if (flags & MS_BIND) | |
533 | error = aa_bind_mount(label, path, dev_name, flags); | |
534 | else if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE | | |
535 | MS_UNBINDABLE)) | |
536 | error = aa_mount_change_type(label, path, flags); | |
537 | else if (flags & MS_MOVE) | |
538 | error = aa_move_mount(label, path, dev_name); | |
539 | else | |
540 | error = aa_new_mount(label, dev_name, path, type, | |
541 | flags, data); | |
542 | } | |
543 | __end_current_label_crit_section(label); | |
544 | ||
545 | return error; | |
546 | } | |
547 | ||
548 | static int apparmor_sb_umount(struct vfsmount *mnt, int flags) | |
549 | { | |
550 | struct aa_label *label; | |
551 | int error = 0; | |
552 | ||
553 | label = __begin_current_label_crit_section(); | |
554 | if (!unconfined(label)) | |
555 | error = aa_umount(label, mnt, flags); | |
556 | __end_current_label_crit_section(label); | |
557 | ||
558 | return error; | |
559 | } | |
560 | ||
561 | static int apparmor_sb_pivotroot(const struct path *old_path, | |
562 | const struct path *new_path) | |
563 | { | |
564 | struct aa_label *label; | |
565 | int error = 0; | |
566 | ||
567 | label = aa_get_current_label(); | |
568 | if (!unconfined(label)) | |
569 | error = aa_pivotroot(label, old_path, new_path); | |
570 | aa_put_label(label); | |
571 | ||
572 | return error; | |
573 | } | |
574 | ||
b5e95b48 JJ |
575 | static int apparmor_getprocattr(struct task_struct *task, char *name, |
576 | char **value) | |
577 | { | |
578 | int error = -ENOENT; | |
b5e95b48 JJ |
579 | /* released below */ |
580 | const struct cred *cred = get_task_cred(task); | |
de62de59 | 581 | struct aa_task_ctx *ctx = task_ctx(current); |
637f688d | 582 | struct aa_label *label = NULL; |
b5e95b48 JJ |
583 | |
584 | if (strcmp(name, "current") == 0) | |
d9087c49 | 585 | label = aa_get_newest_label(cred_label(cred)); |
55a26ebf | 586 | else if (strcmp(name, "prev") == 0 && ctx->previous) |
637f688d | 587 | label = aa_get_newest_label(ctx->previous); |
55a26ebf | 588 | else if (strcmp(name, "exec") == 0 && ctx->onexec) |
637f688d | 589 | label = aa_get_newest_label(ctx->onexec); |
b5e95b48 JJ |
590 | else |
591 | error = -EINVAL; | |
592 | ||
637f688d | 593 | if (label) |
76a1d263 | 594 | error = aa_getprocattr(label, value); |
77b071b3 | 595 | |
637f688d | 596 | aa_put_label(label); |
b5e95b48 JJ |
597 | put_cred(cred); |
598 | ||
599 | return error; | |
600 | } | |
601 | ||
b21507e2 SS |
602 | static int apparmor_setprocattr(const char *name, void *value, |
603 | size_t size) | |
b5e95b48 | 604 | { |
e89b8081 | 605 | char *command, *largs = NULL, *args = value; |
b5e95b48 JJ |
606 | size_t arg_size; |
607 | int error; | |
ef88a7ac | 608 | DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SETPROCATTR); |
b5e95b48 JJ |
609 | |
610 | if (size == 0) | |
611 | return -EINVAL; | |
b5e95b48 | 612 | |
e89b8081 VN |
613 | /* AppArmor requires that the buffer must be null terminated atm */ |
614 | if (args[size - 1] != '\0') { | |
615 | /* null terminate */ | |
616 | largs = args = kmalloc(size + 1, GFP_KERNEL); | |
617 | if (!args) | |
618 | return -ENOMEM; | |
619 | memcpy(args, value, size); | |
620 | args[size] = '\0'; | |
621 | } | |
622 | ||
623 | error = -EINVAL; | |
b5e95b48 JJ |
624 | args = strim(args); |
625 | command = strsep(&args, " "); | |
626 | if (!args) | |
e89b8081 | 627 | goto out; |
b5e95b48 JJ |
628 | args = skip_spaces(args); |
629 | if (!*args) | |
e89b8081 | 630 | goto out; |
b5e95b48 | 631 | |
d4d03f74 | 632 | arg_size = size - (args - (largs ? largs : (char *) value)); |
b5e95b48 JJ |
633 | if (strcmp(name, "current") == 0) { |
634 | if (strcmp(command, "changehat") == 0) { | |
635 | error = aa_setprocattr_changehat(args, arg_size, | |
df8073c6 | 636 | AA_CHANGE_NOFLAGS); |
b5e95b48 JJ |
637 | } else if (strcmp(command, "permhat") == 0) { |
638 | error = aa_setprocattr_changehat(args, arg_size, | |
df8073c6 | 639 | AA_CHANGE_TEST); |
b5e95b48 | 640 | } else if (strcmp(command, "changeprofile") == 0) { |
df8073c6 | 641 | error = aa_change_profile(args, AA_CHANGE_NOFLAGS); |
b5e95b48 | 642 | } else if (strcmp(command, "permprofile") == 0) { |
df8073c6 | 643 | error = aa_change_profile(args, AA_CHANGE_TEST); |
6c5fc8f1 JJ |
644 | } else if (strcmp(command, "stack") == 0) { |
645 | error = aa_change_profile(args, AA_CHANGE_STACK); | |
3eea57c2 JJ |
646 | } else |
647 | goto fail; | |
b5e95b48 | 648 | } else if (strcmp(name, "exec") == 0) { |
3eea57c2 | 649 | if (strcmp(command, "exec") == 0) |
df8073c6 | 650 | error = aa_change_profile(args, AA_CHANGE_ONEXEC); |
6c5fc8f1 JJ |
651 | else if (strcmp(command, "stack") == 0) |
652 | error = aa_change_profile(args, (AA_CHANGE_ONEXEC | | |
653 | AA_CHANGE_STACK)); | |
3eea57c2 JJ |
654 | else |
655 | goto fail; | |
656 | } else | |
b5e95b48 | 657 | /* only support the "current" and "exec" process attributes */ |
e89b8081 | 658 | goto fail; |
3eea57c2 | 659 | |
b5e95b48 JJ |
660 | if (!error) |
661 | error = size; | |
e89b8081 VN |
662 | out: |
663 | kfree(largs); | |
b5e95b48 | 664 | return error; |
3eea57c2 JJ |
665 | |
666 | fail: | |
637f688d | 667 | aad(&sa)->label = begin_current_label_crit_section(); |
ef88a7ac JJ |
668 | aad(&sa)->info = name; |
669 | aad(&sa)->error = error = -EINVAL; | |
3eea57c2 | 670 | aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL); |
637f688d | 671 | end_current_label_crit_section(aad(&sa)->label); |
e89b8081 | 672 | goto out; |
b5e95b48 JJ |
673 | } |
674 | ||
fe864821 JJ |
675 | /** |
676 | * apparmor_bprm_committing_creds - do task cleanup on committing new creds | |
677 | * @bprm: binprm for the exec (NOT NULL) | |
678 | */ | |
679 | static void apparmor_bprm_committing_creds(struct linux_binprm *bprm) | |
680 | { | |
637f688d | 681 | struct aa_label *label = aa_current_raw_label(); |
d9087c49 | 682 | struct aa_label *new_label = cred_label(bprm->cred); |
fe864821 JJ |
683 | |
684 | /* bail out if unconfined or not changing profile */ | |
d9087c49 JJ |
685 | if ((new_label->proxy == label->proxy) || |
686 | (unconfined(new_label))) | |
fe864821 JJ |
687 | return; |
688 | ||
192ca6b5 JJ |
689 | aa_inherit_files(bprm->cred, current->files); |
690 | ||
fe864821 JJ |
691 | current->pdeath_signal = 0; |
692 | ||
637f688d | 693 | /* reset soft limits and set hard limits for the new label */ |
d9087c49 | 694 | __aa_transition_rlimits(label, new_label); |
fe864821 JJ |
695 | } |
696 | ||
697 | /** | |
698 | * apparmor_bprm_committed_cred - do cleanup after new creds committed | |
699 | * @bprm: binprm for the exec (NOT NULL) | |
700 | */ | |
701 | static void apparmor_bprm_committed_creds(struct linux_binprm *bprm) | |
702 | { | |
3b529a76 | 703 | /* clear out temporary/transitional state from the context */ |
de62de59 | 704 | aa_clear_task_ctx_trans(task_ctx(current)); |
3b529a76 | 705 | |
fe864821 JJ |
706 | return; |
707 | } | |
708 | ||
a7ae3645 JJ |
709 | static void apparmor_task_getsecid(struct task_struct *p, u32 *secid) |
710 | { | |
711 | struct aa_label *label = aa_get_task_label(p); | |
712 | *secid = label->secid; | |
713 | aa_put_label(label); | |
714 | } | |
715 | ||
7cb4dc9f JS |
716 | static int apparmor_task_setrlimit(struct task_struct *task, |
717 | unsigned int resource, struct rlimit *new_rlim) | |
b5e95b48 | 718 | { |
637f688d | 719 | struct aa_label *label = __begin_current_label_crit_section(); |
b5e95b48 JJ |
720 | int error = 0; |
721 | ||
637f688d | 722 | if (!unconfined(label)) |
86b92cb7 | 723 | error = aa_task_setrlimit(label, task, resource, new_rlim); |
637f688d | 724 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
725 | |
726 | return error; | |
727 | } | |
728 | ||
ae7795bc | 729 | static int apparmor_task_kill(struct task_struct *target, struct kernel_siginfo *info, |
6b4f3d01 | 730 | int sig, const struct cred *cred) |
cd1dbf76 JJ |
731 | { |
732 | struct aa_label *cl, *tl; | |
733 | int error; | |
734 | ||
6b4f3d01 SS |
735 | if (cred) { |
736 | /* | |
737 | * Dealing with USB IO specific behavior | |
cd1dbf76 | 738 | */ |
6b4f3d01 SS |
739 | cl = aa_get_newest_cred_label(cred); |
740 | tl = aa_get_task_label(target); | |
741 | error = aa_may_signal(cl, tl, sig); | |
742 | aa_put_label(cl); | |
743 | aa_put_label(tl); | |
744 | return error; | |
745 | } | |
746 | ||
cd1dbf76 JJ |
747 | cl = __begin_current_label_crit_section(); |
748 | tl = aa_get_task_label(target); | |
749 | error = aa_may_signal(cl, tl, sig); | |
750 | aa_put_label(tl); | |
751 | __end_current_label_crit_section(cl); | |
752 | ||
753 | return error; | |
754 | } | |
755 | ||
56974a6f JJ |
756 | /** |
757 | * apparmor_sk_alloc_security - allocate and attach the sk_security field | |
758 | */ | |
759 | static int apparmor_sk_alloc_security(struct sock *sk, int family, gfp_t flags) | |
760 | { | |
761 | struct aa_sk_ctx *ctx; | |
762 | ||
763 | ctx = kzalloc(sizeof(*ctx), flags); | |
764 | if (!ctx) | |
765 | return -ENOMEM; | |
766 | ||
767 | SK_CTX(sk) = ctx; | |
768 | ||
769 | return 0; | |
770 | } | |
771 | ||
772 | /** | |
773 | * apparmor_sk_free_security - free the sk_security field | |
774 | */ | |
775 | static void apparmor_sk_free_security(struct sock *sk) | |
776 | { | |
777 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
778 | ||
779 | SK_CTX(sk) = NULL; | |
780 | aa_put_label(ctx->label); | |
781 | aa_put_label(ctx->peer); | |
782 | kfree(ctx); | |
783 | } | |
784 | ||
785 | /** | |
786 | * apparmor_clone_security - clone the sk_security field | |
787 | */ | |
788 | static void apparmor_sk_clone_security(const struct sock *sk, | |
789 | struct sock *newsk) | |
790 | { | |
791 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
792 | struct aa_sk_ctx *new = SK_CTX(newsk); | |
793 | ||
794 | new->label = aa_get_label(ctx->label); | |
795 | new->peer = aa_get_label(ctx->peer); | |
796 | } | |
797 | ||
798 | /** | |
799 | * apparmor_socket_create - check perms before creating a new socket | |
800 | */ | |
801 | static int apparmor_socket_create(int family, int type, int protocol, int kern) | |
802 | { | |
803 | struct aa_label *label; | |
804 | int error = 0; | |
805 | ||
806 | AA_BUG(in_interrupt()); | |
807 | ||
808 | label = begin_current_label_crit_section(); | |
809 | if (!(kern || unconfined(label))) | |
810 | error = af_select(family, | |
811 | create_perm(label, family, type, protocol), | |
812 | aa_af_perm(label, OP_CREATE, AA_MAY_CREATE, | |
813 | family, type, protocol)); | |
814 | end_current_label_crit_section(label); | |
815 | ||
816 | return error; | |
817 | } | |
818 | ||
819 | /** | |
820 | * apparmor_socket_post_create - setup the per-socket security struct | |
821 | * | |
822 | * Note: | |
823 | * - kernel sockets currently labeled unconfined but we may want to | |
824 | * move to a special kernel label | |
825 | * - socket may not have sk here if created with sock_create_lite or | |
826 | * sock_alloc. These should be accept cases which will be handled in | |
827 | * sock_graft. | |
828 | */ | |
829 | static int apparmor_socket_post_create(struct socket *sock, int family, | |
830 | int type, int protocol, int kern) | |
831 | { | |
832 | struct aa_label *label; | |
833 | ||
834 | if (kern) { | |
835 | struct aa_ns *ns = aa_get_current_ns(); | |
836 | ||
837 | label = aa_get_label(ns_unconfined(ns)); | |
838 | aa_put_ns(ns); | |
839 | } else | |
840 | label = aa_get_current_label(); | |
841 | ||
842 | if (sock->sk) { | |
843 | struct aa_sk_ctx *ctx = SK_CTX(sock->sk); | |
844 | ||
845 | aa_put_label(ctx->label); | |
846 | ctx->label = aa_get_label(label); | |
847 | } | |
848 | aa_put_label(label); | |
849 | ||
850 | return 0; | |
851 | } | |
852 | ||
853 | /** | |
854 | * apparmor_socket_bind - check perms before bind addr to socket | |
855 | */ | |
856 | static int apparmor_socket_bind(struct socket *sock, | |
857 | struct sockaddr *address, int addrlen) | |
858 | { | |
859 | AA_BUG(!sock); | |
860 | AA_BUG(!sock->sk); | |
861 | AA_BUG(!address); | |
862 | AA_BUG(in_interrupt()); | |
863 | ||
864 | return af_select(sock->sk->sk_family, | |
865 | bind_perm(sock, address, addrlen), | |
866 | aa_sk_perm(OP_BIND, AA_MAY_BIND, sock->sk)); | |
867 | } | |
868 | ||
869 | /** | |
870 | * apparmor_socket_connect - check perms before connecting @sock to @address | |
871 | */ | |
872 | static int apparmor_socket_connect(struct socket *sock, | |
873 | struct sockaddr *address, int addrlen) | |
874 | { | |
875 | AA_BUG(!sock); | |
876 | AA_BUG(!sock->sk); | |
877 | AA_BUG(!address); | |
878 | AA_BUG(in_interrupt()); | |
879 | ||
880 | return af_select(sock->sk->sk_family, | |
881 | connect_perm(sock, address, addrlen), | |
882 | aa_sk_perm(OP_CONNECT, AA_MAY_CONNECT, sock->sk)); | |
883 | } | |
884 | ||
885 | /** | |
886 | * apparmor_socket_list - check perms before allowing listen | |
887 | */ | |
888 | static int apparmor_socket_listen(struct socket *sock, int backlog) | |
889 | { | |
890 | AA_BUG(!sock); | |
891 | AA_BUG(!sock->sk); | |
892 | AA_BUG(in_interrupt()); | |
893 | ||
894 | return af_select(sock->sk->sk_family, | |
895 | listen_perm(sock, backlog), | |
896 | aa_sk_perm(OP_LISTEN, AA_MAY_LISTEN, sock->sk)); | |
897 | } | |
898 | ||
899 | /** | |
900 | * apparmor_socket_accept - check perms before accepting a new connection. | |
901 | * | |
902 | * Note: while @newsock is created and has some information, the accept | |
903 | * has not been done. | |
904 | */ | |
905 | static int apparmor_socket_accept(struct socket *sock, struct socket *newsock) | |
906 | { | |
907 | AA_BUG(!sock); | |
908 | AA_BUG(!sock->sk); | |
909 | AA_BUG(!newsock); | |
910 | AA_BUG(in_interrupt()); | |
911 | ||
912 | return af_select(sock->sk->sk_family, | |
913 | accept_perm(sock, newsock), | |
914 | aa_sk_perm(OP_ACCEPT, AA_MAY_ACCEPT, sock->sk)); | |
915 | } | |
916 | ||
917 | static int aa_sock_msg_perm(const char *op, u32 request, struct socket *sock, | |
918 | struct msghdr *msg, int size) | |
919 | { | |
920 | AA_BUG(!sock); | |
921 | AA_BUG(!sock->sk); | |
922 | AA_BUG(!msg); | |
923 | AA_BUG(in_interrupt()); | |
924 | ||
925 | return af_select(sock->sk->sk_family, | |
926 | msg_perm(op, request, sock, msg, size), | |
927 | aa_sk_perm(op, request, sock->sk)); | |
928 | } | |
929 | ||
930 | /** | |
931 | * apparmor_socket_sendmsg - check perms before sending msg to another socket | |
932 | */ | |
933 | static int apparmor_socket_sendmsg(struct socket *sock, | |
934 | struct msghdr *msg, int size) | |
935 | { | |
936 | return aa_sock_msg_perm(OP_SENDMSG, AA_MAY_SEND, sock, msg, size); | |
937 | } | |
938 | ||
939 | /** | |
940 | * apparmor_socket_recvmsg - check perms before receiving a message | |
941 | */ | |
942 | static int apparmor_socket_recvmsg(struct socket *sock, | |
943 | struct msghdr *msg, int size, int flags) | |
944 | { | |
945 | return aa_sock_msg_perm(OP_RECVMSG, AA_MAY_RECEIVE, sock, msg, size); | |
946 | } | |
947 | ||
948 | /* revaliation, get/set attr, shutdown */ | |
949 | static int aa_sock_perm(const char *op, u32 request, struct socket *sock) | |
950 | { | |
951 | AA_BUG(!sock); | |
952 | AA_BUG(!sock->sk); | |
953 | AA_BUG(in_interrupt()); | |
954 | ||
955 | return af_select(sock->sk->sk_family, | |
956 | sock_perm(op, request, sock), | |
957 | aa_sk_perm(op, request, sock->sk)); | |
958 | } | |
959 | ||
960 | /** | |
961 | * apparmor_socket_getsockname - check perms before getting the local address | |
962 | */ | |
963 | static int apparmor_socket_getsockname(struct socket *sock) | |
964 | { | |
965 | return aa_sock_perm(OP_GETSOCKNAME, AA_MAY_GETATTR, sock); | |
966 | } | |
967 | ||
968 | /** | |
969 | * apparmor_socket_getpeername - check perms before getting remote address | |
970 | */ | |
971 | static int apparmor_socket_getpeername(struct socket *sock) | |
972 | { | |
973 | return aa_sock_perm(OP_GETPEERNAME, AA_MAY_GETATTR, sock); | |
974 | } | |
975 | ||
976 | /* revaliation, get/set attr, opt */ | |
977 | static int aa_sock_opt_perm(const char *op, u32 request, struct socket *sock, | |
978 | int level, int optname) | |
979 | { | |
980 | AA_BUG(!sock); | |
981 | AA_BUG(!sock->sk); | |
982 | AA_BUG(in_interrupt()); | |
983 | ||
984 | return af_select(sock->sk->sk_family, | |
985 | opt_perm(op, request, sock, level, optname), | |
986 | aa_sk_perm(op, request, sock->sk)); | |
987 | } | |
988 | ||
989 | /** | |
990 | * apparmor_getsockopt - check perms before getting socket options | |
991 | */ | |
992 | static int apparmor_socket_getsockopt(struct socket *sock, int level, | |
993 | int optname) | |
994 | { | |
995 | return aa_sock_opt_perm(OP_GETSOCKOPT, AA_MAY_GETOPT, sock, | |
996 | level, optname); | |
997 | } | |
998 | ||
999 | /** | |
1000 | * apparmor_setsockopt - check perms before setting socket options | |
1001 | */ | |
1002 | static int apparmor_socket_setsockopt(struct socket *sock, int level, | |
1003 | int optname) | |
1004 | { | |
1005 | return aa_sock_opt_perm(OP_SETSOCKOPT, AA_MAY_SETOPT, sock, | |
1006 | level, optname); | |
1007 | } | |
1008 | ||
1009 | /** | |
1010 | * apparmor_socket_shutdown - check perms before shutting down @sock conn | |
1011 | */ | |
1012 | static int apparmor_socket_shutdown(struct socket *sock, int how) | |
1013 | { | |
1014 | return aa_sock_perm(OP_SHUTDOWN, AA_MAY_SHUTDOWN, sock); | |
1015 | } | |
1016 | ||
e1af4779 | 1017 | #ifdef CONFIG_NETWORK_SECMARK |
56974a6f JJ |
1018 | /** |
1019 | * apparmor_socket_sock_recv_skb - check perms before associating skb to sk | |
1020 | * | |
1021 | * Note: can not sleep may be called with locks held | |
1022 | * | |
1023 | * dont want protocol specific in __skb_recv_datagram() | |
1024 | * to deny an incoming connection socket_sock_rcv_skb() | |
1025 | */ | |
1026 | static int apparmor_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
1027 | { | |
ab9f2115 MG |
1028 | struct aa_sk_ctx *ctx = SK_CTX(sk); |
1029 | ||
1030 | if (!skb->secmark) | |
1031 | return 0; | |
1032 | ||
1033 | return apparmor_secmark_check(ctx->label, OP_RECVMSG, AA_MAY_RECEIVE, | |
1034 | skb->secmark, sk); | |
56974a6f | 1035 | } |
e1af4779 | 1036 | #endif |
56974a6f JJ |
1037 | |
1038 | ||
1039 | static struct aa_label *sk_peer_label(struct sock *sk) | |
1040 | { | |
1041 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
1042 | ||
1043 | if (ctx->peer) | |
1044 | return ctx->peer; | |
1045 | ||
1046 | return ERR_PTR(-ENOPROTOOPT); | |
1047 | } | |
1048 | ||
1049 | /** | |
1050 | * apparmor_socket_getpeersec_stream - get security context of peer | |
1051 | * | |
1052 | * Note: for tcp only valid if using ipsec or cipso on lan | |
1053 | */ | |
1054 | static int apparmor_socket_getpeersec_stream(struct socket *sock, | |
1055 | char __user *optval, | |
1056 | int __user *optlen, | |
1057 | unsigned int len) | |
1058 | { | |
1059 | char *name; | |
1060 | int slen, error = 0; | |
1061 | struct aa_label *label; | |
1062 | struct aa_label *peer; | |
1063 | ||
1064 | label = begin_current_label_crit_section(); | |
1065 | peer = sk_peer_label(sock->sk); | |
1066 | if (IS_ERR(peer)) { | |
1067 | error = PTR_ERR(peer); | |
1068 | goto done; | |
1069 | } | |
1070 | slen = aa_label_asxprint(&name, labels_ns(label), peer, | |
1071 | FLAG_SHOW_MODE | FLAG_VIEW_SUBNS | | |
1072 | FLAG_HIDDEN_UNCONFINED, GFP_KERNEL); | |
1073 | /* don't include terminating \0 in slen, it breaks some apps */ | |
1074 | if (slen < 0) { | |
1075 | error = -ENOMEM; | |
1076 | } else { | |
1077 | if (slen > len) { | |
1078 | error = -ERANGE; | |
1079 | } else if (copy_to_user(optval, name, slen)) { | |
1080 | error = -EFAULT; | |
1081 | goto out; | |
1082 | } | |
1083 | if (put_user(slen, optlen)) | |
1084 | error = -EFAULT; | |
1085 | out: | |
1086 | kfree(name); | |
1087 | ||
1088 | } | |
1089 | ||
1090 | done: | |
1091 | end_current_label_crit_section(label); | |
1092 | ||
1093 | return error; | |
1094 | } | |
1095 | ||
1096 | /** | |
1097 | * apparmor_socket_getpeersec_dgram - get security label of packet | |
1098 | * @sock: the peer socket | |
1099 | * @skb: packet data | |
1100 | * @secid: pointer to where to put the secid of the packet | |
1101 | * | |
1102 | * Sets the netlabel socket state on sk from parent | |
1103 | */ | |
1104 | static int apparmor_socket_getpeersec_dgram(struct socket *sock, | |
1105 | struct sk_buff *skb, u32 *secid) | |
1106 | ||
1107 | { | |
1108 | /* TODO: requires secid support */ | |
1109 | return -ENOPROTOOPT; | |
1110 | } | |
1111 | ||
1112 | /** | |
1113 | * apparmor_sock_graft - Initialize newly created socket | |
1114 | * @sk: child sock | |
1115 | * @parent: parent socket | |
1116 | * | |
1117 | * Note: could set off of SOCK_CTX(parent) but need to track inode and we can | |
1118 | * just set sk security information off of current creating process label | |
1119 | * Labeling of sk for accept case - probably should be sock based | |
1120 | * instead of task, because of the case where an implicitly labeled | |
1121 | * socket is shared by different tasks. | |
1122 | */ | |
1123 | static void apparmor_sock_graft(struct sock *sk, struct socket *parent) | |
1124 | { | |
1125 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
1126 | ||
1127 | if (!ctx->label) | |
1128 | ctx->label = aa_get_current_label(); | |
1129 | } | |
1130 | ||
e1af4779 | 1131 | #ifdef CONFIG_NETWORK_SECMARK |
ab9f2115 MG |
1132 | static int apparmor_inet_conn_request(struct sock *sk, struct sk_buff *skb, |
1133 | struct request_sock *req) | |
1134 | { | |
1135 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
1136 | ||
1137 | if (!skb->secmark) | |
1138 | return 0; | |
1139 | ||
1140 | return apparmor_secmark_check(ctx->label, OP_CONNECT, AA_MAY_CONNECT, | |
1141 | skb->secmark, sk); | |
1142 | } | |
e1af4779 | 1143 | #endif |
ab9f2115 | 1144 | |
bbd3662a CS |
1145 | /* |
1146 | * The cred blob is a pointer to, not an instance of, an aa_task_ctx. | |
1147 | */ | |
1148 | struct lsm_blob_sizes apparmor_blob_sizes __lsm_ro_after_init = { | |
1149 | .lbs_cred = sizeof(struct aa_task_ctx *), | |
33bf60ca | 1150 | .lbs_file = sizeof(struct aa_file_ctx), |
f4ad8f2c | 1151 | .lbs_task = sizeof(struct aa_task_ctx), |
bbd3662a CS |
1152 | }; |
1153 | ||
ca97d939 | 1154 | static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = { |
e20b043a CS |
1155 | LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check), |
1156 | LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme), | |
1157 | LSM_HOOK_INIT(capget, apparmor_capget), | |
1158 | LSM_HOOK_INIT(capable, apparmor_capable), | |
1159 | ||
2ea3ffb7 JJ |
1160 | LSM_HOOK_INIT(sb_mount, apparmor_sb_mount), |
1161 | LSM_HOOK_INIT(sb_umount, apparmor_sb_umount), | |
1162 | LSM_HOOK_INIT(sb_pivotroot, apparmor_sb_pivotroot), | |
1163 | ||
e20b043a CS |
1164 | LSM_HOOK_INIT(path_link, apparmor_path_link), |
1165 | LSM_HOOK_INIT(path_unlink, apparmor_path_unlink), | |
1166 | LSM_HOOK_INIT(path_symlink, apparmor_path_symlink), | |
1167 | LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir), | |
1168 | LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir), | |
1169 | LSM_HOOK_INIT(path_mknod, apparmor_path_mknod), | |
1170 | LSM_HOOK_INIT(path_rename, apparmor_path_rename), | |
1171 | LSM_HOOK_INIT(path_chmod, apparmor_path_chmod), | |
1172 | LSM_HOOK_INIT(path_chown, apparmor_path_chown), | |
1173 | LSM_HOOK_INIT(path_truncate, apparmor_path_truncate), | |
1174 | LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr), | |
1175 | ||
1176 | LSM_HOOK_INIT(file_open, apparmor_file_open), | |
064dc947 | 1177 | LSM_HOOK_INIT(file_receive, apparmor_file_receive), |
e20b043a CS |
1178 | LSM_HOOK_INIT(file_permission, apparmor_file_permission), |
1179 | LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security), | |
1180 | LSM_HOOK_INIT(file_free_security, apparmor_file_free_security), | |
1181 | LSM_HOOK_INIT(mmap_file, apparmor_mmap_file), | |
e20b043a CS |
1182 | LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect), |
1183 | LSM_HOOK_INIT(file_lock, apparmor_file_lock), | |
1184 | ||
1185 | LSM_HOOK_INIT(getprocattr, apparmor_getprocattr), | |
1186 | LSM_HOOK_INIT(setprocattr, apparmor_setprocattr), | |
1187 | ||
56974a6f JJ |
1188 | LSM_HOOK_INIT(sk_alloc_security, apparmor_sk_alloc_security), |
1189 | LSM_HOOK_INIT(sk_free_security, apparmor_sk_free_security), | |
1190 | LSM_HOOK_INIT(sk_clone_security, apparmor_sk_clone_security), | |
1191 | ||
1192 | LSM_HOOK_INIT(socket_create, apparmor_socket_create), | |
1193 | LSM_HOOK_INIT(socket_post_create, apparmor_socket_post_create), | |
1194 | LSM_HOOK_INIT(socket_bind, apparmor_socket_bind), | |
1195 | LSM_HOOK_INIT(socket_connect, apparmor_socket_connect), | |
1196 | LSM_HOOK_INIT(socket_listen, apparmor_socket_listen), | |
1197 | LSM_HOOK_INIT(socket_accept, apparmor_socket_accept), | |
1198 | LSM_HOOK_INIT(socket_sendmsg, apparmor_socket_sendmsg), | |
1199 | LSM_HOOK_INIT(socket_recvmsg, apparmor_socket_recvmsg), | |
1200 | LSM_HOOK_INIT(socket_getsockname, apparmor_socket_getsockname), | |
1201 | LSM_HOOK_INIT(socket_getpeername, apparmor_socket_getpeername), | |
1202 | LSM_HOOK_INIT(socket_getsockopt, apparmor_socket_getsockopt), | |
1203 | LSM_HOOK_INIT(socket_setsockopt, apparmor_socket_setsockopt), | |
1204 | LSM_HOOK_INIT(socket_shutdown, apparmor_socket_shutdown), | |
e1af4779 | 1205 | #ifdef CONFIG_NETWORK_SECMARK |
56974a6f | 1206 | LSM_HOOK_INIT(socket_sock_rcv_skb, apparmor_socket_sock_rcv_skb), |
e1af4779 | 1207 | #endif |
56974a6f JJ |
1208 | LSM_HOOK_INIT(socket_getpeersec_stream, |
1209 | apparmor_socket_getpeersec_stream), | |
1210 | LSM_HOOK_INIT(socket_getpeersec_dgram, | |
1211 | apparmor_socket_getpeersec_dgram), | |
1212 | LSM_HOOK_INIT(sock_graft, apparmor_sock_graft), | |
e1af4779 | 1213 | #ifdef CONFIG_NETWORK_SECMARK |
ab9f2115 | 1214 | LSM_HOOK_INIT(inet_conn_request, apparmor_inet_conn_request), |
e1af4779 | 1215 | #endif |
56974a6f | 1216 | |
e20b043a CS |
1217 | LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank), |
1218 | LSM_HOOK_INIT(cred_free, apparmor_cred_free), | |
1219 | LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare), | |
1220 | LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer), | |
1221 | ||
1222 | LSM_HOOK_INIT(bprm_set_creds, apparmor_bprm_set_creds), | |
1223 | LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds), | |
1224 | LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds), | |
e20b043a | 1225 | |
3b529a76 JJ |
1226 | LSM_HOOK_INIT(task_free, apparmor_task_free), |
1227 | LSM_HOOK_INIT(task_alloc, apparmor_task_alloc), | |
a7ae3645 | 1228 | LSM_HOOK_INIT(task_getsecid, apparmor_task_getsecid), |
e20b043a | 1229 | LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit), |
cd1dbf76 | 1230 | LSM_HOOK_INIT(task_kill, apparmor_task_kill), |
c0929212 | 1231 | |
e79c26d0 MG |
1232 | #ifdef CONFIG_AUDIT |
1233 | LSM_HOOK_INIT(audit_rule_init, aa_audit_rule_init), | |
1234 | LSM_HOOK_INIT(audit_rule_known, aa_audit_rule_known), | |
1235 | LSM_HOOK_INIT(audit_rule_match, aa_audit_rule_match), | |
1236 | LSM_HOOK_INIT(audit_rule_free, aa_audit_rule_free), | |
1237 | #endif | |
1238 | ||
c0929212 JJ |
1239 | LSM_HOOK_INIT(secid_to_secctx, apparmor_secid_to_secctx), |
1240 | LSM_HOOK_INIT(secctx_to_secid, apparmor_secctx_to_secid), | |
1241 | LSM_HOOK_INIT(release_secctx, apparmor_release_secctx), | |
b5e95b48 JJ |
1242 | }; |
1243 | ||
1244 | /* | |
1245 | * AppArmor sysfs module parameters | |
1246 | */ | |
1247 | ||
101d6c82 SR |
1248 | static int param_set_aabool(const char *val, const struct kernel_param *kp); |
1249 | static int param_get_aabool(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 1250 | #define param_check_aabool param_check_bool |
9c27847d | 1251 | static const struct kernel_param_ops param_ops_aabool = { |
6a4c2643 | 1252 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
1253 | .set = param_set_aabool, |
1254 | .get = param_get_aabool | |
1255 | }; | |
b5e95b48 | 1256 | |
101d6c82 SR |
1257 | static int param_set_aauint(const char *val, const struct kernel_param *kp); |
1258 | static int param_get_aauint(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 1259 | #define param_check_aauint param_check_uint |
9c27847d | 1260 | static const struct kernel_param_ops param_ops_aauint = { |
101d6c82 SR |
1261 | .set = param_set_aauint, |
1262 | .get = param_get_aauint | |
1263 | }; | |
b5e95b48 | 1264 | |
101d6c82 SR |
1265 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp); |
1266 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 1267 | #define param_check_aalockpolicy param_check_bool |
9c27847d | 1268 | static const struct kernel_param_ops param_ops_aalockpolicy = { |
6a4c2643 | 1269 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
1270 | .set = param_set_aalockpolicy, |
1271 | .get = param_get_aalockpolicy | |
1272 | }; | |
b5e95b48 | 1273 | |
e4dca7b7 KC |
1274 | static int param_set_audit(const char *val, const struct kernel_param *kp); |
1275 | static int param_get_audit(char *buffer, const struct kernel_param *kp); | |
b5e95b48 | 1276 | |
e4dca7b7 KC |
1277 | static int param_set_mode(const char *val, const struct kernel_param *kp); |
1278 | static int param_get_mode(char *buffer, const struct kernel_param *kp); | |
b5e95b48 JJ |
1279 | |
1280 | /* Flag values, also controllable via /sys/module/apparmor/parameters | |
1281 | * We define special types as we want to do additional mediation. | |
1282 | */ | |
1283 | ||
1284 | /* AppArmor global enforcement switch - complain, enforce, kill */ | |
1285 | enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE; | |
1286 | module_param_call(mode, param_set_mode, param_get_mode, | |
1287 | &aa_g_profile_mode, S_IRUSR | S_IWUSR); | |
1288 | ||
6059f71f | 1289 | /* whether policy verification hashing is enabled */ |
7616ac70 | 1290 | bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT); |
3ccb76c5 | 1291 | #ifdef CONFIG_SECURITY_APPARMOR_HASH |
6059f71f | 1292 | module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR); |
7616ac70 | 1293 | #endif |
6059f71f | 1294 | |
b5e95b48 | 1295 | /* Debug mode */ |
eea7a05f | 1296 | bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_APPARMOR_DEBUG_MESSAGES); |
b5e95b48 JJ |
1297 | module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR); |
1298 | ||
1299 | /* Audit mode */ | |
1300 | enum audit_mode aa_g_audit; | |
1301 | module_param_call(audit, param_set_audit, param_get_audit, | |
1302 | &aa_g_audit, S_IRUSR | S_IWUSR); | |
1303 | ||
1304 | /* Determines if audit header is included in audited messages. This | |
1305 | * provides more context if the audit daemon is not running | |
1306 | */ | |
954317fe | 1307 | bool aa_g_audit_header = true; |
b5e95b48 JJ |
1308 | module_param_named(audit_header, aa_g_audit_header, aabool, |
1309 | S_IRUSR | S_IWUSR); | |
1310 | ||
1311 | /* lock out loading/removal of policy | |
1312 | * TODO: add in at boot loading of policy, which is the only way to | |
1313 | * load policy, if lock_policy is set | |
1314 | */ | |
90ab5ee9 | 1315 | bool aa_g_lock_policy; |
b5e95b48 JJ |
1316 | module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy, |
1317 | S_IRUSR | S_IWUSR); | |
1318 | ||
1319 | /* Syscall logging mode */ | |
90ab5ee9 | 1320 | bool aa_g_logsyscall; |
b5e95b48 JJ |
1321 | module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR); |
1322 | ||
1323 | /* Maximum pathname length before accesses will start getting rejected */ | |
1324 | unsigned int aa_g_path_max = 2 * PATH_MAX; | |
622f6e32 | 1325 | module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR); |
b5e95b48 JJ |
1326 | |
1327 | /* Determines how paranoid loading of policy is and how much verification | |
1328 | * on the loaded policy is done. | |
abbf8734 JJ |
1329 | * DEPRECATED: read only as strict checking of load is always done now |
1330 | * that none root users (user namespaces) can load policy. | |
b5e95b48 | 1331 | */ |
954317fe | 1332 | bool aa_g_paranoid_load = true; |
abbf8734 | 1333 | module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO); |
b5e95b48 | 1334 | |
e33c1b99 KC |
1335 | static int param_get_aaintbool(char *buffer, const struct kernel_param *kp); |
1336 | static int param_set_aaintbool(const char *val, const struct kernel_param *kp); | |
1337 | #define param_check_aaintbool param_check_int | |
1338 | static const struct kernel_param_ops param_ops_aaintbool = { | |
1339 | .set = param_set_aaintbool, | |
1340 | .get = param_get_aaintbool | |
1341 | }; | |
b5e95b48 | 1342 | /* Boot time disable flag */ |
0102fb83 | 1343 | static int apparmor_enabled __lsm_ro_after_init = 1; |
e33c1b99 | 1344 | module_param_named(enabled, apparmor_enabled, aaintbool, 0444); |
b5e95b48 JJ |
1345 | |
1346 | static int __init apparmor_enabled_setup(char *str) | |
1347 | { | |
1348 | unsigned long enabled; | |
29707b20 | 1349 | int error = kstrtoul(str, 0, &enabled); |
b5e95b48 JJ |
1350 | if (!error) |
1351 | apparmor_enabled = enabled ? 1 : 0; | |
1352 | return 1; | |
1353 | } | |
1354 | ||
1355 | __setup("apparmor=", apparmor_enabled_setup); | |
1356 | ||
1357 | /* set global flag turning off the ability to load policy */ | |
101d6c82 | 1358 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp) |
b5e95b48 | 1359 | { |
545de8fe JJ |
1360 | if (!apparmor_enabled) |
1361 | return -EINVAL; | |
1362 | if (apparmor_initialized && !policy_admin_capable(NULL)) | |
b5e95b48 | 1363 | return -EPERM; |
b5e95b48 JJ |
1364 | return param_set_bool(val, kp); |
1365 | } | |
1366 | ||
101d6c82 | 1367 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1368 | { |
ca4bd5ae JJ |
1369 | if (!apparmor_enabled) |
1370 | return -EINVAL; | |
545de8fe JJ |
1371 | if (apparmor_initialized && !policy_view_capable(NULL)) |
1372 | return -EPERM; | |
b5e95b48 JJ |
1373 | return param_get_bool(buffer, kp); |
1374 | } | |
1375 | ||
101d6c82 | 1376 | static int param_set_aabool(const char *val, const struct kernel_param *kp) |
b5e95b48 | 1377 | { |
ca4bd5ae JJ |
1378 | if (!apparmor_enabled) |
1379 | return -EINVAL; | |
545de8fe JJ |
1380 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
1381 | return -EPERM; | |
b5e95b48 JJ |
1382 | return param_set_bool(val, kp); |
1383 | } | |
1384 | ||
101d6c82 | 1385 | static int param_get_aabool(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1386 | { |
ca4bd5ae JJ |
1387 | if (!apparmor_enabled) |
1388 | return -EINVAL; | |
545de8fe JJ |
1389 | if (apparmor_initialized && !policy_view_capable(NULL)) |
1390 | return -EPERM; | |
b5e95b48 JJ |
1391 | return param_get_bool(buffer, kp); |
1392 | } | |
1393 | ||
101d6c82 | 1394 | static int param_set_aauint(const char *val, const struct kernel_param *kp) |
b5e95b48 | 1395 | { |
39d84824 JJ |
1396 | int error; |
1397 | ||
ca4bd5ae JJ |
1398 | if (!apparmor_enabled) |
1399 | return -EINVAL; | |
39d84824 JJ |
1400 | /* file is ro but enforce 2nd line check */ |
1401 | if (apparmor_initialized) | |
545de8fe | 1402 | return -EPERM; |
39d84824 JJ |
1403 | |
1404 | error = param_set_uint(val, kp); | |
1405 | pr_info("AppArmor: buffer size set to %d bytes\n", aa_g_path_max); | |
1406 | ||
1407 | return error; | |
b5e95b48 JJ |
1408 | } |
1409 | ||
101d6c82 | 1410 | static int param_get_aauint(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1411 | { |
ca4bd5ae JJ |
1412 | if (!apparmor_enabled) |
1413 | return -EINVAL; | |
545de8fe JJ |
1414 | if (apparmor_initialized && !policy_view_capable(NULL)) |
1415 | return -EPERM; | |
b5e95b48 JJ |
1416 | return param_get_uint(buffer, kp); |
1417 | } | |
1418 | ||
e33c1b99 KC |
1419 | /* Can only be set before AppArmor is initialized (i.e. on boot cmdline). */ |
1420 | static int param_set_aaintbool(const char *val, const struct kernel_param *kp) | |
1421 | { | |
1422 | struct kernel_param kp_local; | |
1423 | bool value; | |
1424 | int error; | |
1425 | ||
1426 | if (apparmor_initialized) | |
1427 | return -EPERM; | |
1428 | ||
1429 | /* Create local copy, with arg pointing to bool type. */ | |
1430 | value = !!*((int *)kp->arg); | |
1431 | memcpy(&kp_local, kp, sizeof(kp_local)); | |
1432 | kp_local.arg = &value; | |
1433 | ||
1434 | error = param_set_bool(val, &kp_local); | |
1435 | if (!error) | |
1436 | *((int *)kp->arg) = *((bool *)kp_local.arg); | |
1437 | return error; | |
1438 | } | |
1439 | ||
1440 | /* | |
1441 | * To avoid changing /sys/module/apparmor/parameters/enabled from Y/N to | |
1442 | * 1/0, this converts the "int that is actually bool" back to bool for | |
1443 | * display in the /sys filesystem, while keeping it "int" for the LSM | |
1444 | * infrastructure. | |
1445 | */ | |
1446 | static int param_get_aaintbool(char *buffer, const struct kernel_param *kp) | |
1447 | { | |
1448 | struct kernel_param kp_local; | |
1449 | bool value; | |
1450 | ||
1451 | /* Create local copy, with arg pointing to bool type. */ | |
1452 | value = !!*((int *)kp->arg); | |
1453 | memcpy(&kp_local, kp, sizeof(kp_local)); | |
1454 | kp_local.arg = &value; | |
1455 | ||
1456 | return param_get_bool(buffer, &kp_local); | |
1457 | } | |
1458 | ||
e4dca7b7 | 1459 | static int param_get_audit(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1460 | { |
b5e95b48 JJ |
1461 | if (!apparmor_enabled) |
1462 | return -EINVAL; | |
545de8fe JJ |
1463 | if (apparmor_initialized && !policy_view_capable(NULL)) |
1464 | return -EPERM; | |
b5e95b48 JJ |
1465 | return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]); |
1466 | } | |
1467 | ||
e4dca7b7 | 1468 | static int param_set_audit(const char *val, const struct kernel_param *kp) |
b5e95b48 JJ |
1469 | { |
1470 | int i; | |
b5e95b48 JJ |
1471 | |
1472 | if (!apparmor_enabled) | |
1473 | return -EINVAL; | |
b5e95b48 JJ |
1474 | if (!val) |
1475 | return -EINVAL; | |
545de8fe JJ |
1476 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
1477 | return -EPERM; | |
b5e95b48 | 1478 | |
5d8779a5 AS |
1479 | i = match_string(audit_mode_names, AUDIT_MAX_INDEX, val); |
1480 | if (i < 0) | |
1481 | return -EINVAL; | |
b5e95b48 | 1482 | |
5d8779a5 AS |
1483 | aa_g_audit = i; |
1484 | return 0; | |
b5e95b48 JJ |
1485 | } |
1486 | ||
e4dca7b7 | 1487 | static int param_get_mode(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1488 | { |
b5e95b48 JJ |
1489 | if (!apparmor_enabled) |
1490 | return -EINVAL; | |
545de8fe JJ |
1491 | if (apparmor_initialized && !policy_view_capable(NULL)) |
1492 | return -EPERM; | |
b5e95b48 | 1493 | |
0d259f04 | 1494 | return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]); |
b5e95b48 JJ |
1495 | } |
1496 | ||
e4dca7b7 | 1497 | static int param_set_mode(const char *val, const struct kernel_param *kp) |
b5e95b48 JJ |
1498 | { |
1499 | int i; | |
b5e95b48 JJ |
1500 | |
1501 | if (!apparmor_enabled) | |
1502 | return -EINVAL; | |
b5e95b48 JJ |
1503 | if (!val) |
1504 | return -EINVAL; | |
545de8fe JJ |
1505 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
1506 | return -EPERM; | |
b5e95b48 | 1507 | |
5d8779a5 AS |
1508 | i = match_string(aa_profile_mode_names, APPARMOR_MODE_NAMES_MAX_INDEX, |
1509 | val); | |
1510 | if (i < 0) | |
1511 | return -EINVAL; | |
b5e95b48 | 1512 | |
5d8779a5 AS |
1513 | aa_g_profile_mode = i; |
1514 | return 0; | |
b5e95b48 JJ |
1515 | } |
1516 | ||
1517 | /* | |
1518 | * AppArmor init functions | |
1519 | */ | |
1520 | ||
1521 | /** | |
55a26ebf | 1522 | * set_init_ctx - set a task context and profile on the first task. |
b5e95b48 JJ |
1523 | * |
1524 | * TODO: allow setting an alternate profile than unconfined | |
1525 | */ | |
55a26ebf | 1526 | static int __init set_init_ctx(void) |
b5e95b48 JJ |
1527 | { |
1528 | struct cred *cred = (struct cred *)current->real_cred; | |
b5e95b48 | 1529 | |
69b5a44a | 1530 | set_cred_label(cred, aa_get_label(ns_unconfined(root_ns))); |
b5e95b48 JJ |
1531 | |
1532 | return 0; | |
1533 | } | |
1534 | ||
d4669f0b JJ |
1535 | static void destroy_buffers(void) |
1536 | { | |
1537 | u32 i, j; | |
1538 | ||
1539 | for_each_possible_cpu(i) { | |
1540 | for_each_cpu_buffer(j) { | |
1541 | kfree(per_cpu(aa_buffers, i).buf[j]); | |
1542 | per_cpu(aa_buffers, i).buf[j] = NULL; | |
1543 | } | |
1544 | } | |
1545 | } | |
1546 | ||
1547 | static int __init alloc_buffers(void) | |
1548 | { | |
1549 | u32 i, j; | |
1550 | ||
1551 | for_each_possible_cpu(i) { | |
1552 | for_each_cpu_buffer(j) { | |
1553 | char *buffer; | |
1554 | ||
1555 | if (cpu_to_node(i) > num_online_nodes()) | |
1556 | /* fallback to kmalloc for offline nodes */ | |
1557 | buffer = kmalloc(aa_g_path_max, GFP_KERNEL); | |
1558 | else | |
1559 | buffer = kmalloc_node(aa_g_path_max, GFP_KERNEL, | |
1560 | cpu_to_node(i)); | |
1561 | if (!buffer) { | |
1562 | destroy_buffers(); | |
1563 | return -ENOMEM; | |
1564 | } | |
1565 | per_cpu(aa_buffers, i).buf[j] = buffer; | |
1566 | } | |
1567 | } | |
1568 | ||
1569 | return 0; | |
1570 | } | |
1571 | ||
e3ea1ca5 TH |
1572 | #ifdef CONFIG_SYSCTL |
1573 | static int apparmor_dointvec(struct ctl_table *table, int write, | |
1574 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1575 | { | |
1576 | if (!policy_admin_capable(NULL)) | |
1577 | return -EPERM; | |
1578 | if (!apparmor_enabled) | |
1579 | return -EINVAL; | |
1580 | ||
1581 | return proc_dointvec(table, write, buffer, lenp, ppos); | |
1582 | } | |
1583 | ||
1584 | static struct ctl_path apparmor_sysctl_path[] = { | |
1585 | { .procname = "kernel", }, | |
1586 | { } | |
1587 | }; | |
1588 | ||
1589 | static struct ctl_table apparmor_sysctl_table[] = { | |
1590 | { | |
1591 | .procname = "unprivileged_userns_apparmor_policy", | |
1592 | .data = &unprivileged_userns_apparmor_policy, | |
1593 | .maxlen = sizeof(int), | |
1594 | .mode = 0600, | |
1595 | .proc_handler = apparmor_dointvec, | |
1596 | }, | |
1597 | { } | |
1598 | }; | |
1599 | ||
1600 | static int __init apparmor_init_sysctl(void) | |
1601 | { | |
1602 | return register_sysctl_paths(apparmor_sysctl_path, | |
1603 | apparmor_sysctl_table) ? 0 : -ENOMEM; | |
1604 | } | |
1605 | #else | |
1606 | static inline int apparmor_init_sysctl(void) | |
1607 | { | |
1608 | return 0; | |
1609 | } | |
1610 | #endif /* CONFIG_SYSCTL */ | |
1611 | ||
e1af4779 | 1612 | #if defined(CONFIG_NETFILTER) && defined(CONFIG_NETWORK_SECMARK) |
ab9f2115 MG |
1613 | static unsigned int apparmor_ip_postroute(void *priv, |
1614 | struct sk_buff *skb, | |
1615 | const struct nf_hook_state *state) | |
1616 | { | |
1617 | struct aa_sk_ctx *ctx; | |
1618 | struct sock *sk; | |
1619 | ||
1620 | if (!skb->secmark) | |
1621 | return NF_ACCEPT; | |
1622 | ||
1623 | sk = skb_to_full_sk(skb); | |
1624 | if (sk == NULL) | |
1625 | return NF_ACCEPT; | |
1626 | ||
1627 | ctx = SK_CTX(sk); | |
1628 | if (!apparmor_secmark_check(ctx->label, OP_SENDMSG, AA_MAY_SEND, | |
1629 | skb->secmark, sk)) | |
1630 | return NF_ACCEPT; | |
1631 | ||
1632 | return NF_DROP_ERR(-ECONNREFUSED); | |
1633 | ||
1634 | } | |
1635 | ||
1636 | static unsigned int apparmor_ipv4_postroute(void *priv, | |
1637 | struct sk_buff *skb, | |
1638 | const struct nf_hook_state *state) | |
1639 | { | |
1640 | return apparmor_ip_postroute(priv, skb, state); | |
1641 | } | |
1642 | ||
a1a02062 | 1643 | #if IS_ENABLED(CONFIG_IPV6) |
ab9f2115 MG |
1644 | static unsigned int apparmor_ipv6_postroute(void *priv, |
1645 | struct sk_buff *skb, | |
1646 | const struct nf_hook_state *state) | |
1647 | { | |
1648 | return apparmor_ip_postroute(priv, skb, state); | |
1649 | } | |
a1a02062 | 1650 | #endif |
ab9f2115 MG |
1651 | |
1652 | static const struct nf_hook_ops apparmor_nf_ops[] = { | |
1653 | { | |
1654 | .hook = apparmor_ipv4_postroute, | |
1655 | .pf = NFPROTO_IPV4, | |
1656 | .hooknum = NF_INET_POST_ROUTING, | |
1657 | .priority = NF_IP_PRI_SELINUX_FIRST, | |
1658 | }, | |
1659 | #if IS_ENABLED(CONFIG_IPV6) | |
1660 | { | |
1661 | .hook = apparmor_ipv6_postroute, | |
1662 | .pf = NFPROTO_IPV6, | |
1663 | .hooknum = NF_INET_POST_ROUTING, | |
1664 | .priority = NF_IP6_PRI_SELINUX_FIRST, | |
1665 | }, | |
1666 | #endif | |
1667 | }; | |
1668 | ||
1669 | static int __net_init apparmor_nf_register(struct net *net) | |
1670 | { | |
1671 | int ret; | |
1672 | ||
1673 | ret = nf_register_net_hooks(net, apparmor_nf_ops, | |
1674 | ARRAY_SIZE(apparmor_nf_ops)); | |
1675 | return ret; | |
1676 | } | |
1677 | ||
1678 | static void __net_exit apparmor_nf_unregister(struct net *net) | |
1679 | { | |
1680 | nf_unregister_net_hooks(net, apparmor_nf_ops, | |
1681 | ARRAY_SIZE(apparmor_nf_ops)); | |
1682 | } | |
1683 | ||
1684 | static struct pernet_operations apparmor_net_ops = { | |
1685 | .init = apparmor_nf_register, | |
1686 | .exit = apparmor_nf_unregister, | |
1687 | }; | |
1688 | ||
1689 | static int __init apparmor_nf_ip_init(void) | |
1690 | { | |
1691 | int err; | |
1692 | ||
1693 | if (!apparmor_enabled) | |
1694 | return 0; | |
1695 | ||
1696 | err = register_pernet_subsys(&apparmor_net_ops); | |
1697 | if (err) | |
1698 | panic("Apparmor: register_pernet_subsys: error %d\n", err); | |
1699 | ||
1700 | return 0; | |
1701 | } | |
1702 | __initcall(apparmor_nf_ip_init); | |
e1af4779 | 1703 | #endif |
ab9f2115 | 1704 | |
b5e95b48 JJ |
1705 | static int __init apparmor_init(void) |
1706 | { | |
1707 | int error; | |
1708 | ||
a4c3f89c JJ |
1709 | aa_secids_init(); |
1710 | ||
11c236b8 JJ |
1711 | error = aa_setup_dfa_engine(); |
1712 | if (error) { | |
1713 | AA_ERROR("Unable to setup dfa engine\n"); | |
1714 | goto alloc_out; | |
1715 | } | |
1716 | ||
b5e95b48 JJ |
1717 | error = aa_alloc_root_ns(); |
1718 | if (error) { | |
1719 | AA_ERROR("Unable to allocate default profile namespace\n"); | |
1720 | goto alloc_out; | |
1721 | } | |
1722 | ||
e3ea1ca5 TH |
1723 | error = apparmor_init_sysctl(); |
1724 | if (error) { | |
1725 | AA_ERROR("Unable to register sysctls\n"); | |
1726 | goto alloc_out; | |
1727 | ||
1728 | } | |
1729 | ||
d4669f0b JJ |
1730 | error = alloc_buffers(); |
1731 | if (error) { | |
1732 | AA_ERROR("Unable to allocate work buffers\n"); | |
1733 | goto buffers_out; | |
1734 | } | |
1735 | ||
55a26ebf | 1736 | error = set_init_ctx(); |
b5e95b48 JJ |
1737 | if (error) { |
1738 | AA_ERROR("Failed to set context on init task\n"); | |
b1d9e6b0 | 1739 | aa_free_root_ns(); |
d4669f0b | 1740 | goto buffers_out; |
b5e95b48 | 1741 | } |
d69dece5 CS |
1742 | security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks), |
1743 | "apparmor"); | |
b5e95b48 JJ |
1744 | |
1745 | /* Report that AppArmor successfully initialized */ | |
1746 | apparmor_initialized = 1; | |
1747 | if (aa_g_profile_mode == APPARMOR_COMPLAIN) | |
1748 | aa_info_message("AppArmor initialized: complain mode enabled"); | |
1749 | else if (aa_g_profile_mode == APPARMOR_KILL) | |
1750 | aa_info_message("AppArmor initialized: kill mode enabled"); | |
1751 | else | |
1752 | aa_info_message("AppArmor initialized"); | |
1753 | ||
1754 | return error; | |
1755 | ||
d4669f0b JJ |
1756 | buffers_out: |
1757 | destroy_buffers(); | |
1758 | ||
b5e95b48 JJ |
1759 | alloc_out: |
1760 | aa_destroy_aafs(); | |
11c236b8 | 1761 | aa_teardown_dfa_engine(); |
b5e95b48 | 1762 | |
954317fe | 1763 | apparmor_enabled = false; |
b5e95b48 | 1764 | return error; |
b5e95b48 JJ |
1765 | } |
1766 | ||
3d6e5f6d | 1767 | DEFINE_LSM(apparmor) = { |
07aed2f2 | 1768 | .name = "apparmor", |
14bd99c8 | 1769 | .flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE, |
c5459b82 | 1770 | .enabled = &apparmor_enabled, |
bbd3662a | 1771 | .blobs = &apparmor_blob_sizes, |
3d6e5f6d KC |
1772 | .init = apparmor_init, |
1773 | }; |