Commit | Line | Data |
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63e2b423 JJ |
1 | /* |
2 | * AppArmor security module | |
3 | * | |
4 | * This file contains AppArmor /sys/kernel/security/apparmor interface functions | |
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 | ||
0d259f04 | 15 | #include <linux/ctype.h> |
63e2b423 JJ |
16 | #include <linux/security.h> |
17 | #include <linux/vmalloc.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/seq_file.h> | |
20 | #include <linux/uaccess.h> | |
a71ada30 | 21 | #include <linux/mount.h> |
63e2b423 | 22 | #include <linux/namei.h> |
e74abcf3 | 23 | #include <linux/capability.h> |
29b3822f | 24 | #include <linux/rcupdate.h> |
a71ada30 | 25 | #include <linux/fs.h> |
d9bf2c26 | 26 | #include <linux/poll.h> |
a481f4d9 JJ |
27 | #include <uapi/linux/major.h> |
28 | #include <uapi/linux/magic.h> | |
63e2b423 JJ |
29 | |
30 | #include "include/apparmor.h" | |
31 | #include "include/apparmorfs.h" | |
32 | #include "include/audit.h" | |
33 | #include "include/context.h" | |
f8eb8a13 | 34 | #include "include/crypto.h" |
d9bf2c26 | 35 | #include "include/policy_ns.h" |
63e2b423 | 36 | #include "include/policy.h" |
cff281f6 | 37 | #include "include/policy_ns.h" |
d384b0a1 | 38 | #include "include/resource.h" |
5ac8c355 | 39 | #include "include/policy_unpack.h" |
63e2b423 | 40 | |
c97204ba JJ |
41 | /* |
42 | * The apparmor filesystem interface used for policy load and introspection | |
43 | * The interface is split into two main components based on their function | |
44 | * a securityfs component: | |
45 | * used for static files that are always available, and which allows | |
46 | * userspace to specificy the location of the security filesystem. | |
47 | * | |
48 | * fns and data are prefixed with | |
49 | * aa_sfs_ | |
50 | * | |
51 | * an apparmorfs component: | |
52 | * used loaded policy content and introspection. It is not part of a | |
53 | * regular mounted filesystem and is available only through the magic | |
54 | * policy symlink in the root of the securityfs apparmor/ directory. | |
55 | * Tasks queries will be magically redirected to the correct portion | |
56 | * of the policy tree based on their confinement. | |
57 | * | |
58 | * fns and data are prefixed with | |
59 | * aafs_ | |
60 | * | |
61 | * The aa_fs_ prefix is used to indicate the fn is used by both the | |
62 | * securityfs and apparmorfs filesystems. | |
63 | */ | |
64 | ||
65 | ||
66 | /* | |
67 | * support fns | |
68 | */ | |
69 | ||
0d259f04 JJ |
70 | /** |
71 | * aa_mangle_name - mangle a profile name to std profile layout form | |
72 | * @name: profile name to mangle (NOT NULL) | |
73 | * @target: buffer to store mangled name, same length as @name (MAYBE NULL) | |
74 | * | |
75 | * Returns: length of mangled name | |
76 | */ | |
bbe4a7c8 | 77 | static int mangle_name(const char *name, char *target) |
0d259f04 JJ |
78 | { |
79 | char *t = target; | |
80 | ||
81 | while (*name == '/' || *name == '.') | |
82 | name++; | |
83 | ||
84 | if (target) { | |
85 | for (; *name; name++) { | |
86 | if (*name == '/') | |
87 | *(t)++ = '.'; | |
88 | else if (isspace(*name)) | |
89 | *(t)++ = '_'; | |
90 | else if (isalnum(*name) || strchr("._-", *name)) | |
91 | *(t)++ = *name; | |
92 | } | |
93 | ||
94 | *t = 0; | |
95 | } else { | |
96 | int len = 0; | |
97 | for (; *name; name++) { | |
98 | if (isalnum(*name) || isspace(*name) || | |
99 | strchr("/._-", *name)) | |
100 | len++; | |
101 | } | |
102 | ||
103 | return len; | |
104 | } | |
105 | ||
106 | return t - target; | |
107 | } | |
108 | ||
a481f4d9 JJ |
109 | |
110 | /* | |
111 | * aafs - core fns and data for the policy tree | |
112 | */ | |
113 | ||
114 | #define AAFS_NAME "apparmorfs" | |
115 | static struct vfsmount *aafs_mnt; | |
116 | static int aafs_count; | |
117 | ||
118 | ||
119 | static int aafs_show_path(struct seq_file *seq, struct dentry *dentry) | |
120 | { | |
121 | struct inode *inode = d_inode(dentry); | |
122 | ||
123 | seq_printf(seq, "%s:[%lu]", AAFS_NAME, inode->i_ino); | |
124 | return 0; | |
125 | } | |
126 | ||
127 | static void aafs_evict_inode(struct inode *inode) | |
128 | { | |
129 | truncate_inode_pages_final(&inode->i_data); | |
130 | clear_inode(inode); | |
131 | if (S_ISLNK(inode->i_mode)) | |
132 | kfree(inode->i_link); | |
133 | } | |
134 | ||
135 | static const struct super_operations aafs_super_ops = { | |
136 | .statfs = simple_statfs, | |
137 | .evict_inode = aafs_evict_inode, | |
138 | .show_path = aafs_show_path, | |
139 | }; | |
140 | ||
141 | static int fill_super(struct super_block *sb, void *data, int silent) | |
142 | { | |
143 | static struct tree_descr files[] = { {""} }; | |
144 | int error; | |
145 | ||
146 | error = simple_fill_super(sb, AAFS_MAGIC, files); | |
147 | if (error) | |
148 | return error; | |
149 | sb->s_op = &aafs_super_ops; | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
154 | static struct dentry *aafs_mount(struct file_system_type *fs_type, | |
155 | int flags, const char *dev_name, void *data) | |
156 | { | |
157 | return mount_single(fs_type, flags, data, fill_super); | |
158 | } | |
159 | ||
160 | static struct file_system_type aafs_ops = { | |
161 | .owner = THIS_MODULE, | |
162 | .name = AAFS_NAME, | |
163 | .mount = aafs_mount, | |
164 | .kill_sb = kill_anon_super, | |
165 | }; | |
166 | ||
167 | /** | |
168 | * __aafs_setup_d_inode - basic inode setup for apparmorfs | |
169 | * @dir: parent directory for the dentry | |
170 | * @dentry: dentry we are seting the inode up for | |
171 | * @mode: permissions the file should have | |
172 | * @data: data to store on inode.i_private, available in open() | |
173 | * @link: if symlink, symlink target string | |
174 | * @fops: struct file_operations that should be used | |
175 | * @iops: struct of inode_operations that should be used | |
176 | */ | |
177 | static int __aafs_setup_d_inode(struct inode *dir, struct dentry *dentry, | |
178 | umode_t mode, void *data, char *link, | |
179 | const struct file_operations *fops, | |
180 | const struct inode_operations *iops) | |
181 | { | |
182 | struct inode *inode = new_inode(dir->i_sb); | |
183 | ||
184 | AA_BUG(!dir); | |
185 | AA_BUG(!dentry); | |
186 | ||
187 | if (!inode) | |
188 | return -ENOMEM; | |
189 | ||
190 | inode->i_ino = get_next_ino(); | |
191 | inode->i_mode = mode; | |
192 | inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); | |
193 | inode->i_private = data; | |
194 | if (S_ISDIR(mode)) { | |
195 | inode->i_op = iops ? iops : &simple_dir_inode_operations; | |
196 | inode->i_fop = &simple_dir_operations; | |
197 | inc_nlink(inode); | |
198 | inc_nlink(dir); | |
199 | } else if (S_ISLNK(mode)) { | |
200 | inode->i_op = iops ? iops : &simple_symlink_inode_operations; | |
201 | inode->i_link = link; | |
202 | } else { | |
203 | inode->i_fop = fops; | |
204 | } | |
205 | d_instantiate(dentry, inode); | |
206 | dget(dentry); | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
211 | /** | |
212 | * aafs_create - create a dentry in the apparmorfs filesystem | |
213 | * | |
214 | * @name: name of dentry to create | |
215 | * @mode: permissions the file should have | |
216 | * @parent: parent directory for this dentry | |
217 | * @data: data to store on inode.i_private, available in open() | |
218 | * @link: if symlink, symlink target string | |
219 | * @fops: struct file_operations that should be used for | |
220 | * @iops: struct of inode_operations that should be used | |
221 | * | |
222 | * This is the basic "create a xxx" function for apparmorfs. | |
223 | * | |
224 | * Returns a pointer to a dentry if it succeeds, that must be free with | |
225 | * aafs_remove(). Will return ERR_PTR on failure. | |
226 | */ | |
227 | static struct dentry *aafs_create(const char *name, umode_t mode, | |
228 | struct dentry *parent, void *data, void *link, | |
229 | const struct file_operations *fops, | |
230 | const struct inode_operations *iops) | |
231 | { | |
232 | struct dentry *dentry; | |
233 | struct inode *dir; | |
234 | int error; | |
235 | ||
236 | AA_BUG(!name); | |
237 | AA_BUG(!parent); | |
238 | ||
239 | if (!(mode & S_IFMT)) | |
240 | mode = (mode & S_IALLUGO) | S_IFREG; | |
241 | ||
242 | error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count); | |
243 | if (error) | |
244 | return ERR_PTR(error); | |
245 | ||
246 | dir = d_inode(parent); | |
247 | ||
248 | inode_lock(dir); | |
249 | dentry = lookup_one_len(name, parent, strlen(name)); | |
250 | if (IS_ERR(dentry)) | |
251 | goto fail_lock; | |
252 | ||
253 | if (d_really_is_positive(dentry)) { | |
254 | error = -EEXIST; | |
255 | goto fail_dentry; | |
256 | } | |
257 | ||
258 | error = __aafs_setup_d_inode(dir, dentry, mode, data, link, fops, iops); | |
259 | if (error) | |
260 | goto fail_dentry; | |
261 | inode_unlock(dir); | |
262 | ||
263 | return dentry; | |
264 | ||
265 | fail_dentry: | |
266 | dput(dentry); | |
267 | ||
268 | fail_lock: | |
269 | inode_unlock(dir); | |
270 | simple_release_fs(&aafs_mnt, &aafs_count); | |
271 | ||
272 | return ERR_PTR(error); | |
273 | } | |
274 | ||
275 | /** | |
276 | * aafs_create_file - create a file in the apparmorfs filesystem | |
277 | * | |
278 | * @name: name of dentry to create | |
279 | * @mode: permissions the file should have | |
280 | * @parent: parent directory for this dentry | |
281 | * @data: data to store on inode.i_private, available in open() | |
282 | * @fops: struct file_operations that should be used for | |
283 | * | |
284 | * see aafs_create | |
285 | */ | |
286 | static struct dentry *aafs_create_file(const char *name, umode_t mode, | |
287 | struct dentry *parent, void *data, | |
288 | const struct file_operations *fops) | |
289 | { | |
290 | return aafs_create(name, mode, parent, data, NULL, fops, NULL); | |
291 | } | |
292 | ||
293 | /** | |
294 | * aafs_create_dir - create a directory in the apparmorfs filesystem | |
295 | * | |
296 | * @name: name of dentry to create | |
297 | * @parent: parent directory for this dentry | |
298 | * | |
299 | * see aafs_create | |
300 | */ | |
301 | static struct dentry *aafs_create_dir(const char *name, struct dentry *parent) | |
302 | { | |
303 | return aafs_create(name, S_IFDIR | 0755, parent, NULL, NULL, NULL, | |
304 | NULL); | |
305 | } | |
306 | ||
307 | /** | |
308 | * aafs_create_symlink - create a symlink in the apparmorfs filesystem | |
309 | * @name: name of dentry to create | |
310 | * @parent: parent directory for this dentry | |
311 | * @target: if symlink, symlink target string | |
312 | * @iops: struct of inode_operations that should be used | |
313 | * | |
314 | * If @target parameter is %NULL, then the @iops parameter needs to be | |
315 | * setup to handle .readlink and .get_link inode_operations. | |
316 | */ | |
317 | static struct dentry *aafs_create_symlink(const char *name, | |
318 | struct dentry *parent, | |
319 | const char *target, | |
320 | const struct inode_operations *iops) | |
321 | { | |
322 | struct dentry *dent; | |
323 | char *link = NULL; | |
324 | ||
325 | if (target) { | |
326 | link = kstrdup(target, GFP_KERNEL); | |
327 | if (!link) | |
328 | return ERR_PTR(-ENOMEM); | |
329 | } | |
330 | dent = aafs_create(name, S_IFLNK | 0444, parent, NULL, link, NULL, | |
331 | iops); | |
332 | if (IS_ERR(dent)) | |
333 | kfree(link); | |
334 | ||
335 | return dent; | |
336 | } | |
337 | ||
338 | /** | |
339 | * aafs_remove - removes a file or directory from the apparmorfs filesystem | |
340 | * | |
341 | * @dentry: dentry of the file/directory/symlink to removed. | |
342 | */ | |
343 | static void aafs_remove(struct dentry *dentry) | |
344 | { | |
345 | struct inode *dir; | |
346 | ||
347 | if (!dentry || IS_ERR(dentry)) | |
348 | return; | |
349 | ||
350 | dir = d_inode(dentry->d_parent); | |
351 | inode_lock(dir); | |
352 | if (simple_positive(dentry)) { | |
353 | if (d_is_dir(dentry)) | |
354 | simple_rmdir(dir, dentry); | |
355 | else | |
356 | simple_unlink(dir, dentry); | |
357 | dput(dentry); | |
358 | } | |
359 | inode_unlock(dir); | |
360 | simple_release_fs(&aafs_mnt, &aafs_count); | |
361 | } | |
362 | ||
363 | ||
364 | /* | |
365 | * aa_fs - policy load/replace/remove | |
366 | */ | |
367 | ||
63e2b423 JJ |
368 | /** |
369 | * aa_simple_write_to_buffer - common routine for getting policy from user | |
63e2b423 | 370 | * @userbuf: user buffer to copy data from (NOT NULL) |
3ed02ada | 371 | * @alloc_size: size of user buffer (REQUIRES: @alloc_size >= @copy_size) |
63e2b423 JJ |
372 | * @copy_size: size of data to copy from user buffer |
373 | * @pos: position write is at in the file (NOT NULL) | |
374 | * | |
375 | * Returns: kernel buffer containing copy of user buffer data or an | |
376 | * ERR_PTR on failure. | |
377 | */ | |
5ef50d01 | 378 | static struct aa_loaddata *aa_simple_write_to_buffer(const char __user *userbuf, |
5ac8c355 JJ |
379 | size_t alloc_size, |
380 | size_t copy_size, | |
381 | loff_t *pos) | |
63e2b423 | 382 | { |
5ac8c355 | 383 | struct aa_loaddata *data; |
63e2b423 | 384 | |
e6bfa25d | 385 | AA_BUG(copy_size > alloc_size); |
3ed02ada | 386 | |
63e2b423 JJ |
387 | if (*pos != 0) |
388 | /* only writes from pos 0, that is complete writes */ | |
389 | return ERR_PTR(-ESPIPE); | |
390 | ||
63e2b423 | 391 | /* freed by caller to simple_write_to_buffer */ |
5d5182ca JJ |
392 | data = aa_loaddata_alloc(alloc_size); |
393 | if (IS_ERR(data)) | |
394 | return data; | |
63e2b423 | 395 | |
5d5182ca | 396 | data->size = copy_size; |
5ac8c355 | 397 | if (copy_from_user(data->data, userbuf, copy_size)) { |
63e2b423 JJ |
398 | kvfree(data); |
399 | return ERR_PTR(-EFAULT); | |
400 | } | |
401 | ||
402 | return data; | |
403 | } | |
404 | ||
18e99f19 | 405 | static ssize_t policy_update(u32 mask, const char __user *buf, size_t size, |
b7fd2c03 | 406 | loff_t *pos, struct aa_ns *ns) |
63e2b423 | 407 | { |
63e2b423 | 408 | ssize_t error; |
5ac8c355 JJ |
409 | struct aa_loaddata *data; |
410 | struct aa_profile *profile = aa_current_profile(); | |
5ac8c355 JJ |
411 | /* high level check about policy management - fine grained in |
412 | * below after unpack | |
413 | */ | |
18e99f19 | 414 | error = aa_may_manage_policy(profile, ns, mask); |
5ac8c355 JJ |
415 | if (error) |
416 | return error; | |
63e2b423 | 417 | |
5ef50d01 | 418 | data = aa_simple_write_to_buffer(buf, size, size, pos); |
63e2b423 JJ |
419 | error = PTR_ERR(data); |
420 | if (!IS_ERR(data)) { | |
b7fd2c03 | 421 | error = aa_replace_profiles(ns ? ns : profile->ns, profile, |
18e99f19 | 422 | mask, data); |
5ac8c355 | 423 | aa_put_loaddata(data); |
63e2b423 JJ |
424 | } |
425 | ||
426 | return error; | |
427 | } | |
428 | ||
b7fd2c03 | 429 | /* .load file hook fn to load policy */ |
5ac8c355 JJ |
430 | static ssize_t profile_load(struct file *f, const char __user *buf, size_t size, |
431 | loff_t *pos) | |
432 | { | |
b7fd2c03 | 433 | struct aa_ns *ns = aa_get_ns(f->f_inode->i_private); |
18e99f19 | 434 | int error = policy_update(AA_MAY_LOAD_POLICY, buf, size, pos, ns); |
b7fd2c03 JJ |
435 | |
436 | aa_put_ns(ns); | |
5ac8c355 JJ |
437 | |
438 | return error; | |
439 | } | |
440 | ||
63e2b423 | 441 | static const struct file_operations aa_fs_profile_load = { |
6038f373 AB |
442 | .write = profile_load, |
443 | .llseek = default_llseek, | |
63e2b423 JJ |
444 | }; |
445 | ||
446 | /* .replace file hook fn to load and/or replace policy */ | |
447 | static ssize_t profile_replace(struct file *f, const char __user *buf, | |
448 | size_t size, loff_t *pos) | |
449 | { | |
b7fd2c03 | 450 | struct aa_ns *ns = aa_get_ns(f->f_inode->i_private); |
18e99f19 JJ |
451 | int error = policy_update(AA_MAY_LOAD_POLICY | AA_MAY_REPLACE_POLICY, |
452 | buf, size, pos, ns); | |
b7fd2c03 | 453 | aa_put_ns(ns); |
63e2b423 JJ |
454 | |
455 | return error; | |
456 | } | |
457 | ||
458 | static const struct file_operations aa_fs_profile_replace = { | |
6038f373 AB |
459 | .write = profile_replace, |
460 | .llseek = default_llseek, | |
63e2b423 JJ |
461 | }; |
462 | ||
b7fd2c03 | 463 | /* .remove file hook fn to remove loaded policy */ |
63e2b423 JJ |
464 | static ssize_t profile_remove(struct file *f, const char __user *buf, |
465 | size_t size, loff_t *pos) | |
466 | { | |
5ac8c355 JJ |
467 | struct aa_loaddata *data; |
468 | struct aa_profile *profile; | |
63e2b423 | 469 | ssize_t error; |
b7fd2c03 | 470 | struct aa_ns *ns = aa_get_ns(f->f_inode->i_private); |
63e2b423 | 471 | |
5ac8c355 JJ |
472 | profile = aa_current_profile(); |
473 | /* high level check about policy management - fine grained in | |
474 | * below after unpack | |
475 | */ | |
18e99f19 | 476 | error = aa_may_manage_policy(profile, ns, AA_MAY_REMOVE_POLICY); |
5ac8c355 JJ |
477 | if (error) |
478 | goto out; | |
479 | ||
63e2b423 JJ |
480 | /* |
481 | * aa_remove_profile needs a null terminated string so 1 extra | |
482 | * byte is allocated and the copied data is null terminated. | |
483 | */ | |
5ef50d01 | 484 | data = aa_simple_write_to_buffer(buf, size + 1, size, pos); |
63e2b423 JJ |
485 | |
486 | error = PTR_ERR(data); | |
487 | if (!IS_ERR(data)) { | |
5ac8c355 | 488 | data->data[size] = 0; |
b7fd2c03 JJ |
489 | error = aa_remove_profiles(ns ? ns : profile->ns, profile, |
490 | data->data, size); | |
5ac8c355 | 491 | aa_put_loaddata(data); |
63e2b423 | 492 | } |
5ac8c355 | 493 | out: |
b7fd2c03 | 494 | aa_put_ns(ns); |
63e2b423 JJ |
495 | return error; |
496 | } | |
497 | ||
498 | static const struct file_operations aa_fs_profile_remove = { | |
6038f373 AB |
499 | .write = profile_remove, |
500 | .llseek = default_llseek, | |
63e2b423 JJ |
501 | }; |
502 | ||
d9bf2c26 JJ |
503 | struct aa_revision { |
504 | struct aa_ns *ns; | |
505 | long last_read; | |
506 | }; | |
507 | ||
508 | /* revision file hook fn for policy loads */ | |
509 | static int ns_revision_release(struct inode *inode, struct file *file) | |
510 | { | |
511 | struct aa_revision *rev = file->private_data; | |
512 | ||
513 | if (rev) { | |
514 | aa_put_ns(rev->ns); | |
515 | kfree(rev); | |
516 | } | |
517 | ||
518 | return 0; | |
519 | } | |
520 | ||
521 | static ssize_t ns_revision_read(struct file *file, char __user *buf, | |
522 | size_t size, loff_t *ppos) | |
523 | { | |
524 | struct aa_revision *rev = file->private_data; | |
525 | char buffer[32]; | |
526 | long last_read; | |
527 | int avail; | |
528 | ||
529 | mutex_lock(&rev->ns->lock); | |
530 | last_read = rev->last_read; | |
531 | if (last_read == rev->ns->revision) { | |
532 | mutex_unlock(&rev->ns->lock); | |
533 | if (file->f_flags & O_NONBLOCK) | |
534 | return -EAGAIN; | |
535 | if (wait_event_interruptible(rev->ns->wait, | |
536 | last_read != | |
537 | READ_ONCE(rev->ns->revision))) | |
538 | return -ERESTARTSYS; | |
539 | mutex_lock(&rev->ns->lock); | |
540 | } | |
541 | ||
542 | avail = sprintf(buffer, "%ld\n", rev->ns->revision); | |
543 | if (*ppos + size > avail) { | |
544 | rev->last_read = rev->ns->revision; | |
545 | *ppos = 0; | |
546 | } | |
547 | mutex_unlock(&rev->ns->lock); | |
548 | ||
549 | return simple_read_from_buffer(buf, size, ppos, buffer, avail); | |
550 | } | |
551 | ||
552 | static int ns_revision_open(struct inode *inode, struct file *file) | |
553 | { | |
554 | struct aa_revision *rev = kzalloc(sizeof(*rev), GFP_KERNEL); | |
555 | ||
556 | if (!rev) | |
557 | return -ENOMEM; | |
558 | ||
559 | rev->ns = aa_get_ns(inode->i_private); | |
560 | if (!rev->ns) | |
561 | rev->ns = aa_get_current_ns(); | |
562 | file->private_data = rev; | |
563 | ||
564 | return 0; | |
565 | } | |
566 | ||
567 | static unsigned int ns_revision_poll(struct file *file, poll_table *pt) | |
568 | { | |
569 | struct aa_revision *rev = file->private_data; | |
570 | unsigned int mask = 0; | |
571 | ||
572 | if (rev) { | |
573 | mutex_lock(&rev->ns->lock); | |
574 | poll_wait(file, &rev->ns->wait, pt); | |
575 | if (rev->last_read < rev->ns->revision) | |
576 | mask |= POLLIN | POLLRDNORM; | |
577 | mutex_unlock(&rev->ns->lock); | |
578 | } | |
579 | ||
580 | return mask; | |
581 | } | |
582 | ||
5d5182ca JJ |
583 | void __aa_bump_ns_revision(struct aa_ns *ns) |
584 | { | |
585 | ns->revision++; | |
d9bf2c26 | 586 | wake_up_interruptible(&ns->wait); |
5d5182ca JJ |
587 | } |
588 | ||
d9bf2c26 JJ |
589 | static const struct file_operations aa_fs_ns_revision_fops = { |
590 | .owner = THIS_MODULE, | |
591 | .open = ns_revision_open, | |
592 | .poll = ns_revision_poll, | |
593 | .read = ns_revision_read, | |
594 | .llseek = generic_file_llseek, | |
595 | .release = ns_revision_release, | |
596 | }; | |
597 | ||
e025be0f WH |
598 | /** |
599 | * query_data - queries a policy and writes its data to buf | |
600 | * @buf: the resulting data is stored here (NOT NULL) | |
601 | * @buf_len: size of buf | |
602 | * @query: query string used to retrieve data | |
603 | * @query_len: size of query including second NUL byte | |
604 | * | |
605 | * The buffers pointed to by buf and query may overlap. The query buffer is | |
606 | * parsed before buf is written to. | |
607 | * | |
608 | * The query should look like "<LABEL>\0<KEY>\0", where <LABEL> is the name of | |
609 | * the security confinement context and <KEY> is the name of the data to | |
610 | * retrieve. <LABEL> and <KEY> must not be NUL-terminated. | |
611 | * | |
612 | * Don't expect the contents of buf to be preserved on failure. | |
613 | * | |
614 | * Returns: number of characters written to buf or -errno on failure | |
615 | */ | |
616 | static ssize_t query_data(char *buf, size_t buf_len, | |
617 | char *query, size_t query_len) | |
618 | { | |
619 | char *out; | |
620 | const char *key; | |
621 | struct aa_profile *profile; | |
622 | struct aa_data *data; | |
623 | u32 bytes, blocks; | |
624 | __le32 outle32; | |
625 | ||
626 | if (!query_len) | |
627 | return -EINVAL; /* need a query */ | |
628 | ||
629 | key = query + strnlen(query, query_len) + 1; | |
630 | if (key + 1 >= query + query_len) | |
631 | return -EINVAL; /* not enough space for a non-empty key */ | |
632 | if (key + strnlen(key, query + query_len - key) >= query + query_len) | |
633 | return -EINVAL; /* must end with NUL */ | |
634 | ||
635 | if (buf_len < sizeof(bytes) + sizeof(blocks)) | |
636 | return -EINVAL; /* not enough space */ | |
637 | ||
638 | profile = aa_current_profile(); | |
639 | ||
640 | /* We are going to leave space for two numbers. The first is the total | |
641 | * number of bytes we are writing after the first number. This is so | |
642 | * users can read the full output without reallocation. | |
643 | * | |
644 | * The second number is the number of data blocks we're writing. An | |
645 | * application might be confined by multiple policies having data in | |
646 | * the same key. | |
647 | */ | |
648 | memset(buf, 0, sizeof(bytes) + sizeof(blocks)); | |
649 | out = buf + sizeof(bytes) + sizeof(blocks); | |
650 | ||
651 | blocks = 0; | |
652 | if (profile->data) { | |
653 | data = rhashtable_lookup_fast(profile->data, &key, | |
654 | profile->data->p); | |
655 | ||
656 | if (data) { | |
657 | if (out + sizeof(outle32) + data->size > buf + buf_len) | |
658 | return -EINVAL; /* not enough space */ | |
659 | outle32 = __cpu_to_le32(data->size); | |
660 | memcpy(out, &outle32, sizeof(outle32)); | |
661 | out += sizeof(outle32); | |
662 | memcpy(out, data->data, data->size); | |
663 | out += data->size; | |
664 | blocks++; | |
665 | } | |
666 | } | |
667 | ||
668 | outle32 = __cpu_to_le32(out - buf - sizeof(bytes)); | |
669 | memcpy(buf, &outle32, sizeof(outle32)); | |
670 | outle32 = __cpu_to_le32(blocks); | |
671 | memcpy(buf + sizeof(bytes), &outle32, sizeof(outle32)); | |
672 | ||
673 | return out - buf; | |
674 | } | |
675 | ||
1dea3b41 JJ |
676 | /* |
677 | * Transaction based IO. | |
678 | * The file expects a write which triggers the transaction, and then | |
679 | * possibly a read(s) which collects the result - which is stored in a | |
680 | * file-local buffer. Once a new write is performed, a new set of results | |
681 | * are stored in the file-local buffer. | |
682 | */ | |
683 | struct multi_transaction { | |
684 | struct kref count; | |
685 | ssize_t size; | |
686 | char data[0]; | |
687 | }; | |
688 | ||
689 | #define MULTI_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct multi_transaction)) | |
690 | /* TODO: replace with per file lock */ | |
691 | static DEFINE_SPINLOCK(multi_transaction_lock); | |
692 | ||
693 | static void multi_transaction_kref(struct kref *kref) | |
694 | { | |
695 | struct multi_transaction *t; | |
696 | ||
697 | t = container_of(kref, struct multi_transaction, count); | |
698 | free_page((unsigned long) t); | |
699 | } | |
700 | ||
701 | static struct multi_transaction * | |
702 | get_multi_transaction(struct multi_transaction *t) | |
703 | { | |
704 | if (t) | |
705 | kref_get(&(t->count)); | |
706 | ||
707 | return t; | |
708 | } | |
709 | ||
710 | static void put_multi_transaction(struct multi_transaction *t) | |
711 | { | |
712 | if (t) | |
713 | kref_put(&(t->count), multi_transaction_kref); | |
714 | } | |
715 | ||
716 | /* does not increment @new's count */ | |
717 | static void multi_transaction_set(struct file *file, | |
718 | struct multi_transaction *new, size_t n) | |
719 | { | |
720 | struct multi_transaction *old; | |
721 | ||
722 | AA_BUG(n > MULTI_TRANSACTION_LIMIT); | |
723 | ||
724 | new->size = n; | |
725 | spin_lock(&multi_transaction_lock); | |
726 | old = (struct multi_transaction *) file->private_data; | |
727 | file->private_data = new; | |
728 | spin_unlock(&multi_transaction_lock); | |
729 | put_multi_transaction(old); | |
730 | } | |
731 | ||
732 | static struct multi_transaction *multi_transaction_new(struct file *file, | |
733 | const char __user *buf, | |
734 | size_t size) | |
735 | { | |
736 | struct multi_transaction *t; | |
737 | ||
738 | if (size > MULTI_TRANSACTION_LIMIT - 1) | |
739 | return ERR_PTR(-EFBIG); | |
740 | ||
741 | t = (struct multi_transaction *)get_zeroed_page(GFP_KERNEL); | |
742 | if (!t) | |
743 | return ERR_PTR(-ENOMEM); | |
744 | kref_init(&t->count); | |
745 | if (copy_from_user(t->data, buf, size)) | |
746 | return ERR_PTR(-EFAULT); | |
747 | ||
748 | return t; | |
749 | } | |
750 | ||
751 | static ssize_t multi_transaction_read(struct file *file, char __user *buf, | |
752 | size_t size, loff_t *pos) | |
753 | { | |
754 | struct multi_transaction *t; | |
755 | ssize_t ret; | |
756 | ||
757 | spin_lock(&multi_transaction_lock); | |
758 | t = get_multi_transaction(file->private_data); | |
759 | spin_unlock(&multi_transaction_lock); | |
760 | if (!t) | |
761 | return 0; | |
762 | ||
763 | ret = simple_read_from_buffer(buf, size, pos, t->data, t->size); | |
764 | put_multi_transaction(t); | |
765 | ||
766 | return ret; | |
767 | } | |
768 | ||
769 | static int multi_transaction_release(struct inode *inode, struct file *file) | |
770 | { | |
771 | put_multi_transaction(file->private_data); | |
772 | ||
773 | return 0; | |
774 | } | |
775 | ||
e025be0f WH |
776 | #define QUERY_CMD_DATA "data\0" |
777 | #define QUERY_CMD_DATA_LEN 5 | |
778 | ||
779 | /** | |
780 | * aa_write_access - generic permissions and data query | |
781 | * @file: pointer to open apparmorfs/access file | |
782 | * @ubuf: user buffer containing the complete query string (NOT NULL) | |
783 | * @count: size of ubuf | |
784 | * @ppos: position in the file (MUST BE ZERO) | |
785 | * | |
786 | * Allows for one permissions or data query per open(), write(), and read() | |
787 | * sequence. The only queries currently supported are label-based queries for | |
788 | * permissions or data. | |
789 | * | |
790 | * For permissions queries, ubuf must begin with "label\0", followed by the | |
791 | * profile query specific format described in the query_label() function | |
792 | * documentation. | |
793 | * | |
794 | * For data queries, ubuf must have the form "data\0<LABEL>\0<KEY>\0", where | |
795 | * <LABEL> is the name of the security confinement context and <KEY> is the | |
796 | * name of the data to retrieve. | |
797 | * | |
798 | * Returns: number of bytes written or -errno on failure | |
799 | */ | |
800 | static ssize_t aa_write_access(struct file *file, const char __user *ubuf, | |
801 | size_t count, loff_t *ppos) | |
802 | { | |
1dea3b41 | 803 | struct multi_transaction *t; |
e025be0f WH |
804 | ssize_t len; |
805 | ||
806 | if (*ppos) | |
807 | return -ESPIPE; | |
808 | ||
1dea3b41 JJ |
809 | t = multi_transaction_new(file, ubuf, count); |
810 | if (IS_ERR(t)) | |
811 | return PTR_ERR(t); | |
e025be0f WH |
812 | |
813 | if (count > QUERY_CMD_DATA_LEN && | |
1dea3b41 JJ |
814 | !memcmp(t->data, QUERY_CMD_DATA, QUERY_CMD_DATA_LEN)) { |
815 | len = query_data(t->data, MULTI_TRANSACTION_LIMIT, | |
816 | t->data + QUERY_CMD_DATA_LEN, | |
e025be0f WH |
817 | count - QUERY_CMD_DATA_LEN); |
818 | } else | |
819 | len = -EINVAL; | |
820 | ||
1dea3b41 JJ |
821 | if (len < 0) { |
822 | put_multi_transaction(t); | |
e025be0f | 823 | return len; |
1dea3b41 | 824 | } |
e025be0f | 825 | |
1dea3b41 | 826 | multi_transaction_set(file, t, len); |
e025be0f WH |
827 | |
828 | return count; | |
829 | } | |
830 | ||
c97204ba | 831 | static const struct file_operations aa_sfs_access = { |
e025be0f | 832 | .write = aa_write_access, |
1dea3b41 JJ |
833 | .read = multi_transaction_read, |
834 | .release = multi_transaction_release, | |
e025be0f WH |
835 | .llseek = generic_file_llseek, |
836 | }; | |
837 | ||
c97204ba | 838 | static int aa_sfs_seq_show(struct seq_file *seq, void *v) |
e74abcf3 | 839 | { |
c97204ba | 840 | struct aa_sfs_entry *fs_file = seq->private; |
e74abcf3 KC |
841 | |
842 | if (!fs_file) | |
843 | return 0; | |
844 | ||
845 | switch (fs_file->v_type) { | |
c97204ba | 846 | case AA_SFS_TYPE_BOOLEAN: |
e74abcf3 KC |
847 | seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no"); |
848 | break; | |
c97204ba | 849 | case AA_SFS_TYPE_STRING: |
a9bf8e9f KC |
850 | seq_printf(seq, "%s\n", fs_file->v.string); |
851 | break; | |
c97204ba | 852 | case AA_SFS_TYPE_U64: |
e74abcf3 KC |
853 | seq_printf(seq, "%#08lx\n", fs_file->v.u64); |
854 | break; | |
855 | default: | |
856 | /* Ignore unpritable entry types. */ | |
857 | break; | |
858 | } | |
859 | ||
860 | return 0; | |
861 | } | |
862 | ||
c97204ba | 863 | static int aa_sfs_seq_open(struct inode *inode, struct file *file) |
e74abcf3 | 864 | { |
c97204ba | 865 | return single_open(file, aa_sfs_seq_show, inode->i_private); |
e74abcf3 KC |
866 | } |
867 | ||
c97204ba | 868 | const struct file_operations aa_sfs_seq_file_ops = { |
e74abcf3 | 869 | .owner = THIS_MODULE, |
c97204ba | 870 | .open = aa_sfs_seq_open, |
e74abcf3 KC |
871 | .read = seq_read, |
872 | .llseek = seq_lseek, | |
873 | .release = single_release, | |
874 | }; | |
875 | ||
52b97de3 JJ |
876 | /* |
877 | * profile based file operations | |
878 | * policy/profiles/XXXX/profiles/ * | |
879 | */ | |
880 | ||
881 | #define SEQ_PROFILE_FOPS(NAME) \ | |
882 | static int seq_profile_ ##NAME ##_open(struct inode *inode, struct file *file)\ | |
883 | { \ | |
884 | return seq_profile_open(inode, file, seq_profile_ ##NAME ##_show); \ | |
885 | } \ | |
886 | \ | |
887 | static const struct file_operations seq_profile_ ##NAME ##_fops = { \ | |
888 | .owner = THIS_MODULE, \ | |
889 | .open = seq_profile_ ##NAME ##_open, \ | |
890 | .read = seq_read, \ | |
891 | .llseek = seq_lseek, \ | |
892 | .release = seq_profile_release, \ | |
893 | } \ | |
894 | ||
895 | static int seq_profile_open(struct inode *inode, struct file *file, | |
896 | int (*show)(struct seq_file *, void *)) | |
0d259f04 | 897 | { |
8399588a JJ |
898 | struct aa_proxy *proxy = aa_get_proxy(inode->i_private); |
899 | int error = single_open(file, show, proxy); | |
0d259f04 JJ |
900 | |
901 | if (error) { | |
902 | file->private_data = NULL; | |
8399588a | 903 | aa_put_proxy(proxy); |
0d259f04 JJ |
904 | } |
905 | ||
906 | return error; | |
907 | } | |
908 | ||
52b97de3 | 909 | static int seq_profile_release(struct inode *inode, struct file *file) |
0d259f04 JJ |
910 | { |
911 | struct seq_file *seq = (struct seq_file *) file->private_data; | |
912 | if (seq) | |
8399588a | 913 | aa_put_proxy(seq->private); |
0d259f04 JJ |
914 | return single_release(inode, file); |
915 | } | |
916 | ||
52b97de3 | 917 | static int seq_profile_name_show(struct seq_file *seq, void *v) |
0d259f04 | 918 | { |
8399588a JJ |
919 | struct aa_proxy *proxy = seq->private; |
920 | struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile); | |
0d259f04 JJ |
921 | seq_printf(seq, "%s\n", profile->base.name); |
922 | aa_put_profile(profile); | |
923 | ||
924 | return 0; | |
925 | } | |
926 | ||
52b97de3 | 927 | static int seq_profile_mode_show(struct seq_file *seq, void *v) |
0d259f04 | 928 | { |
8399588a JJ |
929 | struct aa_proxy *proxy = seq->private; |
930 | struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile); | |
0d259f04 JJ |
931 | seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]); |
932 | aa_put_profile(profile); | |
933 | ||
934 | return 0; | |
935 | } | |
936 | ||
52b97de3 | 937 | static int seq_profile_attach_show(struct seq_file *seq, void *v) |
556d0be7 | 938 | { |
8399588a JJ |
939 | struct aa_proxy *proxy = seq->private; |
940 | struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile); | |
556d0be7 JJ |
941 | if (profile->attach) |
942 | seq_printf(seq, "%s\n", profile->attach); | |
943 | else if (profile->xmatch) | |
944 | seq_puts(seq, "<unknown>\n"); | |
945 | else | |
946 | seq_printf(seq, "%s\n", profile->base.name); | |
947 | aa_put_profile(profile); | |
948 | ||
949 | return 0; | |
950 | } | |
951 | ||
52b97de3 | 952 | static int seq_profile_hash_show(struct seq_file *seq, void *v) |
f8eb8a13 | 953 | { |
8399588a JJ |
954 | struct aa_proxy *proxy = seq->private; |
955 | struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile); | |
f8eb8a13 JJ |
956 | unsigned int i, size = aa_hash_size(); |
957 | ||
958 | if (profile->hash) { | |
959 | for (i = 0; i < size; i++) | |
960 | seq_printf(seq, "%.2x", profile->hash[i]); | |
47dbd1cd | 961 | seq_putc(seq, '\n'); |
f8eb8a13 | 962 | } |
0b938a2e | 963 | aa_put_profile(profile); |
f8eb8a13 JJ |
964 | |
965 | return 0; | |
966 | } | |
967 | ||
52b97de3 JJ |
968 | SEQ_PROFILE_FOPS(name); |
969 | SEQ_PROFILE_FOPS(mode); | |
970 | SEQ_PROFILE_FOPS(attach); | |
971 | SEQ_PROFILE_FOPS(hash); | |
f8eb8a13 | 972 | |
64c86970 JJ |
973 | /* |
974 | * namespace based files | |
975 | * several root files and | |
976 | * policy/ * | |
977 | */ | |
f8eb8a13 | 978 | |
64c86970 JJ |
979 | #define SEQ_NS_FOPS(NAME) \ |
980 | static int seq_ns_ ##NAME ##_open(struct inode *inode, struct file *file) \ | |
981 | { \ | |
982 | return single_open(file, seq_ns_ ##NAME ##_show, inode->i_private); \ | |
983 | } \ | |
984 | \ | |
985 | static const struct file_operations seq_ns_ ##NAME ##_fops = { \ | |
986 | .owner = THIS_MODULE, \ | |
987 | .open = seq_ns_ ##NAME ##_open, \ | |
988 | .read = seq_read, \ | |
989 | .llseek = seq_lseek, \ | |
990 | .release = single_release, \ | |
991 | } \ | |
3e3e5695 | 992 | |
64c86970 | 993 | static int seq_ns_level_show(struct seq_file *seq, void *v) |
a71ada30 JJ |
994 | { |
995 | struct aa_ns *ns = aa_current_profile()->ns; | |
996 | ||
997 | seq_printf(seq, "%d\n", ns->level); | |
998 | ||
999 | return 0; | |
1000 | } | |
1001 | ||
64c86970 | 1002 | static int seq_ns_name_show(struct seq_file *seq, void *v) |
3e3e5695 JJ |
1003 | { |
1004 | struct aa_ns *ns = aa_current_profile()->ns; | |
1005 | ||
1006 | seq_printf(seq, "%s\n", ns->base.name); | |
1007 | ||
1008 | return 0; | |
1009 | } | |
1010 | ||
64c86970 JJ |
1011 | SEQ_NS_FOPS(level); |
1012 | SEQ_NS_FOPS(name); | |
3e3e5695 | 1013 | |
5d5182ca JJ |
1014 | |
1015 | /* policy/raw_data/ * file ops */ | |
1016 | ||
1017 | #define SEQ_RAWDATA_FOPS(NAME) \ | |
1018 | static int seq_rawdata_ ##NAME ##_open(struct inode *inode, struct file *file)\ | |
1019 | { \ | |
1020 | return seq_rawdata_open(inode, file, seq_rawdata_ ##NAME ##_show); \ | |
1021 | } \ | |
1022 | \ | |
1023 | static const struct file_operations seq_rawdata_ ##NAME ##_fops = { \ | |
1024 | .owner = THIS_MODULE, \ | |
1025 | .open = seq_rawdata_ ##NAME ##_open, \ | |
1026 | .read = seq_read, \ | |
1027 | .llseek = seq_lseek, \ | |
1028 | .release = seq_rawdata_release, \ | |
1029 | } \ | |
1030 | ||
1031 | static int seq_rawdata_open(struct inode *inode, struct file *file, | |
1032 | int (*show)(struct seq_file *, void *)) | |
5ac8c355 | 1033 | { |
5d5182ca JJ |
1034 | struct aa_loaddata *data = __aa_get_loaddata(inode->i_private); |
1035 | int error; | |
5ac8c355 | 1036 | |
5d5182ca JJ |
1037 | if (!data) |
1038 | /* lost race this ent is being reaped */ | |
1039 | return -ENOENT; | |
1040 | ||
1041 | error = single_open(file, show, data); | |
1042 | if (error) { | |
1043 | AA_BUG(file->private_data && | |
1044 | ((struct seq_file *)file->private_data)->private); | |
1045 | aa_put_loaddata(data); | |
1046 | } | |
1047 | ||
1048 | return error; | |
5ac8c355 JJ |
1049 | } |
1050 | ||
5d5182ca | 1051 | static int seq_rawdata_release(struct inode *inode, struct file *file) |
5ac8c355 | 1052 | { |
5d5182ca | 1053 | struct seq_file *seq = (struct seq_file *) file->private_data; |
5ac8c355 | 1054 | |
5d5182ca JJ |
1055 | if (seq) |
1056 | aa_put_loaddata(seq->private); | |
0ff3d97f | 1057 | |
5d5182ca JJ |
1058 | return single_release(inode, file); |
1059 | } | |
1060 | ||
1061 | static int seq_rawdata_abi_show(struct seq_file *seq, void *v) | |
1062 | { | |
1063 | struct aa_loaddata *data = seq->private; | |
1064 | ||
1065 | seq_printf(seq, "v%d\n", data->abi); | |
5ac8c355 JJ |
1066 | |
1067 | return 0; | |
1068 | } | |
1069 | ||
5d5182ca | 1070 | static int seq_rawdata_revision_show(struct seq_file *seq, void *v) |
5ac8c355 | 1071 | { |
5d5182ca | 1072 | struct aa_loaddata *data = seq->private; |
5ac8c355 | 1073 | |
5d5182ca JJ |
1074 | seq_printf(seq, "%ld\n", data->revision); |
1075 | ||
1076 | return 0; | |
1077 | } | |
5ac8c355 | 1078 | |
5d5182ca | 1079 | static int seq_rawdata_hash_show(struct seq_file *seq, void *v) |
5ac8c355 | 1080 | { |
5d5182ca | 1081 | struct aa_loaddata *data = seq->private; |
5ac8c355 JJ |
1082 | unsigned int i, size = aa_hash_size(); |
1083 | ||
5d5182ca | 1084 | if (data->hash) { |
5ac8c355 | 1085 | for (i = 0; i < size; i++) |
5d5182ca | 1086 | seq_printf(seq, "%.2x", data->hash[i]); |
47dbd1cd | 1087 | seq_putc(seq, '\n'); |
5ac8c355 | 1088 | } |
5ac8c355 JJ |
1089 | |
1090 | return 0; | |
1091 | } | |
1092 | ||
5d5182ca JJ |
1093 | SEQ_RAWDATA_FOPS(abi); |
1094 | SEQ_RAWDATA_FOPS(revision); | |
1095 | SEQ_RAWDATA_FOPS(hash); | |
5ac8c355 JJ |
1096 | |
1097 | static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size, | |
1098 | loff_t *ppos) | |
1099 | { | |
1100 | struct aa_loaddata *rawdata = file->private_data; | |
1101 | ||
1102 | return simple_read_from_buffer(buf, size, ppos, rawdata->data, | |
1103 | rawdata->size); | |
1104 | } | |
1105 | ||
5d5182ca | 1106 | static int rawdata_release(struct inode *inode, struct file *file) |
5ac8c355 | 1107 | { |
5d5182ca JJ |
1108 | aa_put_loaddata(file->private_data); |
1109 | ||
1110 | return 0; | |
1111 | } | |
5ac8c355 | 1112 | |
5d5182ca JJ |
1113 | static int rawdata_open(struct inode *inode, struct file *file) |
1114 | { | |
5ac8c355 JJ |
1115 | if (!policy_view_capable(NULL)) |
1116 | return -EACCES; | |
5d5182ca JJ |
1117 | file->private_data = __aa_get_loaddata(inode->i_private); |
1118 | if (!file->private_data) | |
1119 | /* lost race: this entry is being reaped */ | |
1120 | return -ENOENT; | |
5ac8c355 JJ |
1121 | |
1122 | return 0; | |
1123 | } | |
1124 | ||
5d5182ca | 1125 | static const struct file_operations rawdata_fops = { |
5ac8c355 JJ |
1126 | .open = rawdata_open, |
1127 | .read = rawdata_read, | |
1128 | .llseek = generic_file_llseek, | |
1129 | .release = rawdata_release, | |
1130 | }; | |
1131 | ||
5d5182ca JJ |
1132 | static void remove_rawdata_dents(struct aa_loaddata *rawdata) |
1133 | { | |
1134 | int i; | |
1135 | ||
1136 | for (i = 0; i < AAFS_LOADDATA_NDENTS; i++) { | |
1137 | if (!IS_ERR_OR_NULL(rawdata->dents[i])) { | |
1138 | /* no refcounts on i_private */ | |
c961ee5f | 1139 | aafs_remove(rawdata->dents[i]); |
5d5182ca JJ |
1140 | rawdata->dents[i] = NULL; |
1141 | } | |
1142 | } | |
1143 | } | |
1144 | ||
1145 | void __aa_fs_remove_rawdata(struct aa_loaddata *rawdata) | |
1146 | { | |
1147 | AA_BUG(rawdata->ns && !mutex_is_locked(&rawdata->ns->lock)); | |
1148 | ||
1149 | if (rawdata->ns) { | |
1150 | remove_rawdata_dents(rawdata); | |
1151 | list_del_init(&rawdata->list); | |
1152 | aa_put_ns(rawdata->ns); | |
1153 | rawdata->ns = NULL; | |
1154 | } | |
1155 | } | |
1156 | ||
1157 | int __aa_fs_create_rawdata(struct aa_ns *ns, struct aa_loaddata *rawdata) | |
1158 | { | |
1159 | struct dentry *dent, *dir; | |
1160 | ||
1161 | AA_BUG(!ns); | |
1162 | AA_BUG(!rawdata); | |
1163 | AA_BUG(!mutex_is_locked(&ns->lock)); | |
1164 | AA_BUG(!ns_subdata_dir(ns)); | |
1165 | ||
1166 | /* | |
1167 | * just use ns revision dir was originally created at. This is | |
1168 | * under ns->lock and if load is successful revision will be | |
1169 | * bumped and is guaranteed to be unique | |
1170 | */ | |
1171 | rawdata->name = kasprintf(GFP_KERNEL, "%ld", ns->revision); | |
1172 | if (!rawdata->name) | |
1173 | return -ENOMEM; | |
1174 | ||
c961ee5f | 1175 | dir = aafs_create_dir(rawdata->name, ns_subdata_dir(ns)); |
5d5182ca JJ |
1176 | if (IS_ERR(dir)) |
1177 | /* ->name freed when rawdata freed */ | |
1178 | return PTR_ERR(dir); | |
1179 | rawdata->dents[AAFS_LOADDATA_DIR] = dir; | |
1180 | ||
c961ee5f | 1181 | dent = aafs_create_file("abi", S_IFREG | 0444, dir, rawdata, |
5d5182ca JJ |
1182 | &seq_rawdata_abi_fops); |
1183 | if (IS_ERR(dent)) | |
1184 | goto fail; | |
1185 | rawdata->dents[AAFS_LOADDATA_ABI] = dent; | |
1186 | ||
c961ee5f | 1187 | dent = aafs_create_file("revision", S_IFREG | 0444, dir, rawdata, |
5d5182ca JJ |
1188 | &seq_rawdata_revision_fops); |
1189 | if (IS_ERR(dent)) | |
1190 | goto fail; | |
1191 | rawdata->dents[AAFS_LOADDATA_REVISION] = dent; | |
1192 | ||
1193 | if (aa_g_hash_policy) { | |
c961ee5f | 1194 | dent = aafs_create_file("sha1", S_IFREG | 0444, dir, |
5d5182ca JJ |
1195 | rawdata, &seq_rawdata_hash_fops); |
1196 | if (IS_ERR(dent)) | |
1197 | goto fail; | |
1198 | rawdata->dents[AAFS_LOADDATA_HASH] = dent; | |
1199 | } | |
1200 | ||
c961ee5f | 1201 | dent = aafs_create_file("raw_data", S_IFREG | 0444, |
5d5182ca JJ |
1202 | dir, rawdata, &rawdata_fops); |
1203 | if (IS_ERR(dent)) | |
1204 | goto fail; | |
1205 | rawdata->dents[AAFS_LOADDATA_DATA] = dent; | |
1206 | d_inode(dent)->i_size = rawdata->size; | |
1207 | ||
1208 | rawdata->ns = aa_get_ns(ns); | |
1209 | list_add(&rawdata->list, &ns->rawdata_list); | |
1210 | /* no refcount on inode rawdata */ | |
1211 | ||
1212 | return 0; | |
1213 | ||
1214 | fail: | |
1215 | remove_rawdata_dents(rawdata); | |
1216 | ||
1217 | return PTR_ERR(dent); | |
1218 | } | |
1219 | ||
0d259f04 | 1220 | /** fns to setup dynamic per profile/namespace files **/ |
c97204ba JJ |
1221 | |
1222 | /** | |
1223 | * | |
1224 | * Requires: @profile->ns->lock held | |
1225 | */ | |
1226 | void __aafs_profile_rmdir(struct aa_profile *profile) | |
0d259f04 JJ |
1227 | { |
1228 | struct aa_profile *child; | |
1229 | int i; | |
1230 | ||
1231 | if (!profile) | |
1232 | return; | |
1233 | ||
1234 | list_for_each_entry(child, &profile->base.profiles, base.list) | |
c97204ba | 1235 | __aafs_profile_rmdir(child); |
0d259f04 JJ |
1236 | |
1237 | for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) { | |
8399588a | 1238 | struct aa_proxy *proxy; |
0d259f04 JJ |
1239 | if (!profile->dents[i]) |
1240 | continue; | |
1241 | ||
8399588a | 1242 | proxy = d_inode(profile->dents[i])->i_private; |
c961ee5f | 1243 | aafs_remove(profile->dents[i]); |
8399588a | 1244 | aa_put_proxy(proxy); |
0d259f04 JJ |
1245 | profile->dents[i] = NULL; |
1246 | } | |
1247 | } | |
1248 | ||
c97204ba JJ |
1249 | /** |
1250 | * | |
1251 | * Requires: @old->ns->lock held | |
1252 | */ | |
1253 | void __aafs_profile_migrate_dents(struct aa_profile *old, | |
1254 | struct aa_profile *new) | |
0d259f04 JJ |
1255 | { |
1256 | int i; | |
1257 | ||
1258 | for (i = 0; i < AAFS_PROF_SIZEOF; i++) { | |
1259 | new->dents[i] = old->dents[i]; | |
d671e890 | 1260 | if (new->dents[i]) |
078cd827 | 1261 | new->dents[i]->d_inode->i_mtime = current_time(new->dents[i]->d_inode); |
0d259f04 JJ |
1262 | old->dents[i] = NULL; |
1263 | } | |
1264 | } | |
1265 | ||
1266 | static struct dentry *create_profile_file(struct dentry *dir, const char *name, | |
1267 | struct aa_profile *profile, | |
1268 | const struct file_operations *fops) | |
1269 | { | |
8399588a | 1270 | struct aa_proxy *proxy = aa_get_proxy(profile->proxy); |
0d259f04 JJ |
1271 | struct dentry *dent; |
1272 | ||
c961ee5f | 1273 | dent = aafs_create_file(name, S_IFREG | 0444, dir, proxy, fops); |
0d259f04 | 1274 | if (IS_ERR(dent)) |
8399588a | 1275 | aa_put_proxy(proxy); |
0d259f04 JJ |
1276 | |
1277 | return dent; | |
1278 | } | |
1279 | ||
5d5182ca JJ |
1280 | static int profile_depth(struct aa_profile *profile) |
1281 | { | |
1282 | int depth = 0; | |
1283 | ||
1284 | rcu_read_lock(); | |
1285 | for (depth = 0; profile; profile = rcu_access_pointer(profile->parent)) | |
1286 | depth++; | |
1287 | rcu_read_unlock(); | |
1288 | ||
1289 | return depth; | |
1290 | } | |
1291 | ||
1292 | static int gen_symlink_name(char *buffer, size_t bsize, int depth, | |
1293 | const char *dirname, const char *fname) | |
1294 | { | |
1295 | int error; | |
1296 | ||
1297 | for (; depth > 0; depth--) { | |
1298 | if (bsize < 7) | |
1299 | return -ENAMETOOLONG; | |
1300 | strcpy(buffer, "../../"); | |
1301 | buffer += 6; | |
1302 | bsize -= 6; | |
1303 | } | |
1304 | ||
1305 | error = snprintf(buffer, bsize, "raw_data/%s/%s", dirname, fname); | |
1306 | if (error >= bsize || error < 0) | |
1307 | return -ENAMETOOLONG; | |
1308 | ||
1309 | return 0; | |
1310 | } | |
1311 | ||
1312 | /* | |
1313 | * Requires: @profile->ns->lock held | |
1314 | */ | |
c97204ba | 1315 | int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent) |
0d259f04 JJ |
1316 | { |
1317 | struct aa_profile *child; | |
1318 | struct dentry *dent = NULL, *dir; | |
1319 | int error; | |
1320 | ||
1321 | if (!parent) { | |
1322 | struct aa_profile *p; | |
1323 | p = aa_deref_parent(profile); | |
1324 | dent = prof_dir(p); | |
1325 | /* adding to parent that previously didn't have children */ | |
c961ee5f | 1326 | dent = aafs_create_dir("profiles", dent); |
0d259f04 JJ |
1327 | if (IS_ERR(dent)) |
1328 | goto fail; | |
1329 | prof_child_dir(p) = parent = dent; | |
1330 | } | |
1331 | ||
1332 | if (!profile->dirname) { | |
1333 | int len, id_len; | |
1334 | len = mangle_name(profile->base.name, NULL); | |
1335 | id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id); | |
1336 | ||
1337 | profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL); | |
ffac1de6 DC |
1338 | if (!profile->dirname) { |
1339 | error = -ENOMEM; | |
1340 | goto fail2; | |
1341 | } | |
0d259f04 JJ |
1342 | |
1343 | mangle_name(profile->base.name, profile->dirname); | |
1344 | sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++); | |
1345 | } | |
1346 | ||
c961ee5f | 1347 | dent = aafs_create_dir(profile->dirname, parent); |
0d259f04 JJ |
1348 | if (IS_ERR(dent)) |
1349 | goto fail; | |
1350 | prof_dir(profile) = dir = dent; | |
1351 | ||
52b97de3 JJ |
1352 | dent = create_profile_file(dir, "name", profile, |
1353 | &seq_profile_name_fops); | |
0d259f04 JJ |
1354 | if (IS_ERR(dent)) |
1355 | goto fail; | |
1356 | profile->dents[AAFS_PROF_NAME] = dent; | |
1357 | ||
52b97de3 JJ |
1358 | dent = create_profile_file(dir, "mode", profile, |
1359 | &seq_profile_mode_fops); | |
0d259f04 JJ |
1360 | if (IS_ERR(dent)) |
1361 | goto fail; | |
1362 | profile->dents[AAFS_PROF_MODE] = dent; | |
1363 | ||
556d0be7 | 1364 | dent = create_profile_file(dir, "attach", profile, |
52b97de3 | 1365 | &seq_profile_attach_fops); |
556d0be7 JJ |
1366 | if (IS_ERR(dent)) |
1367 | goto fail; | |
1368 | profile->dents[AAFS_PROF_ATTACH] = dent; | |
1369 | ||
f8eb8a13 JJ |
1370 | if (profile->hash) { |
1371 | dent = create_profile_file(dir, "sha1", profile, | |
52b97de3 | 1372 | &seq_profile_hash_fops); |
f8eb8a13 JJ |
1373 | if (IS_ERR(dent)) |
1374 | goto fail; | |
1375 | profile->dents[AAFS_PROF_HASH] = dent; | |
1376 | } | |
1377 | ||
5ac8c355 | 1378 | if (profile->rawdata) { |
5d5182ca JJ |
1379 | char target[64]; |
1380 | int depth = profile_depth(profile); | |
1381 | ||
1382 | error = gen_symlink_name(target, sizeof(target), depth, | |
1383 | profile->rawdata->name, "sha1"); | |
1384 | if (error < 0) | |
1385 | goto fail2; | |
c961ee5f | 1386 | dent = aafs_create_symlink("raw_sha1", dir, target, NULL); |
5ac8c355 JJ |
1387 | if (IS_ERR(dent)) |
1388 | goto fail; | |
1389 | profile->dents[AAFS_PROF_RAW_HASH] = dent; | |
1390 | ||
5d5182ca JJ |
1391 | error = gen_symlink_name(target, sizeof(target), depth, |
1392 | profile->rawdata->name, "abi"); | |
1393 | if (error < 0) | |
1394 | goto fail2; | |
c961ee5f | 1395 | dent = aafs_create_symlink("raw_abi", dir, target, NULL); |
5ac8c355 JJ |
1396 | if (IS_ERR(dent)) |
1397 | goto fail; | |
1398 | profile->dents[AAFS_PROF_RAW_ABI] = dent; | |
1399 | ||
5d5182ca JJ |
1400 | error = gen_symlink_name(target, sizeof(target), depth, |
1401 | profile->rawdata->name, "raw_data"); | |
1402 | if (error < 0) | |
1403 | goto fail2; | |
c961ee5f | 1404 | dent = aafs_create_symlink("raw_data", dir, target, NULL); |
5ac8c355 JJ |
1405 | if (IS_ERR(dent)) |
1406 | goto fail; | |
1407 | profile->dents[AAFS_PROF_RAW_DATA] = dent; | |
5ac8c355 JJ |
1408 | } |
1409 | ||
0d259f04 | 1410 | list_for_each_entry(child, &profile->base.profiles, base.list) { |
c97204ba | 1411 | error = __aafs_profile_mkdir(child, prof_child_dir(profile)); |
0d259f04 JJ |
1412 | if (error) |
1413 | goto fail2; | |
1414 | } | |
1415 | ||
1416 | return 0; | |
1417 | ||
1418 | fail: | |
1419 | error = PTR_ERR(dent); | |
1420 | ||
1421 | fail2: | |
c97204ba | 1422 | __aafs_profile_rmdir(profile); |
0d259f04 JJ |
1423 | |
1424 | return error; | |
1425 | } | |
1426 | ||
4ae47f33 JJ |
1427 | static int ns_mkdir_op(struct inode *dir, struct dentry *dentry, umode_t mode) |
1428 | { | |
1429 | struct aa_ns *ns, *parent; | |
1430 | /* TODO: improve permission check */ | |
1431 | struct aa_profile *profile = aa_current_profile(); | |
1432 | int error = aa_may_manage_policy(profile, NULL, AA_MAY_LOAD_POLICY); | |
1433 | ||
1434 | if (error) | |
1435 | return error; | |
1436 | ||
1437 | parent = aa_get_ns(dir->i_private); | |
1438 | AA_BUG(d_inode(ns_subns_dir(parent)) != dir); | |
1439 | ||
1440 | /* we have to unlock and then relock to get locking order right | |
1441 | * for pin_fs | |
1442 | */ | |
1443 | inode_unlock(dir); | |
1444 | error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count); | |
1445 | mutex_lock(&parent->lock); | |
1446 | inode_lock_nested(dir, I_MUTEX_PARENT); | |
1447 | if (error) | |
1448 | goto out; | |
1449 | ||
1450 | error = __aafs_setup_d_inode(dir, dentry, mode | S_IFDIR, NULL, | |
1451 | NULL, NULL, NULL); | |
1452 | if (error) | |
1453 | goto out_pin; | |
1454 | ||
1455 | ns = __aa_find_or_create_ns(parent, READ_ONCE(dentry->d_name.name), | |
1456 | dentry); | |
1457 | if (IS_ERR(ns)) { | |
1458 | error = PTR_ERR(ns); | |
1459 | ns = NULL; | |
1460 | } | |
1461 | ||
1462 | aa_put_ns(ns); /* list ref remains */ | |
1463 | out_pin: | |
1464 | if (error) | |
1465 | simple_release_fs(&aafs_mnt, &aafs_count); | |
1466 | out: | |
1467 | mutex_unlock(&parent->lock); | |
1468 | aa_put_ns(parent); | |
1469 | ||
1470 | return error; | |
1471 | } | |
1472 | ||
1473 | static int ns_rmdir_op(struct inode *dir, struct dentry *dentry) | |
1474 | { | |
1475 | struct aa_ns *ns, *parent; | |
1476 | /* TODO: improve permission check */ | |
1477 | struct aa_profile *profile = aa_current_profile(); | |
1478 | int error = aa_may_manage_policy(profile, NULL, AA_MAY_LOAD_POLICY); | |
1479 | ||
1480 | if (error) | |
1481 | return error; | |
1482 | ||
1483 | parent = aa_get_ns(dir->i_private); | |
1484 | /* rmdir calls the generic securityfs functions to remove files | |
1485 | * from the apparmor dir. It is up to the apparmor ns locking | |
1486 | * to avoid races. | |
1487 | */ | |
1488 | inode_unlock(dir); | |
1489 | inode_unlock(dentry->d_inode); | |
1490 | ||
1491 | mutex_lock(&parent->lock); | |
1492 | ns = aa_get_ns(__aa_findn_ns(&parent->sub_ns, dentry->d_name.name, | |
1493 | dentry->d_name.len)); | |
1494 | if (!ns) { | |
1495 | error = -ENOENT; | |
1496 | goto out; | |
1497 | } | |
1498 | AA_BUG(ns_dir(ns) != dentry); | |
1499 | ||
1500 | __aa_remove_ns(ns); | |
1501 | aa_put_ns(ns); | |
1502 | ||
1503 | out: | |
1504 | mutex_unlock(&parent->lock); | |
1505 | inode_lock_nested(dir, I_MUTEX_PARENT); | |
1506 | inode_lock(dentry->d_inode); | |
1507 | aa_put_ns(parent); | |
1508 | ||
1509 | return error; | |
1510 | } | |
1511 | ||
1512 | static const struct inode_operations ns_dir_inode_operations = { | |
1513 | .lookup = simple_lookup, | |
1514 | .mkdir = ns_mkdir_op, | |
1515 | .rmdir = ns_rmdir_op, | |
1516 | }; | |
1517 | ||
5d5182ca JJ |
1518 | static void __aa_fs_list_remove_rawdata(struct aa_ns *ns) |
1519 | { | |
1520 | struct aa_loaddata *ent, *tmp; | |
1521 | ||
1522 | AA_BUG(!mutex_is_locked(&ns->lock)); | |
1523 | ||
1524 | list_for_each_entry_safe(ent, tmp, &ns->rawdata_list, list) | |
1525 | __aa_fs_remove_rawdata(ent); | |
1526 | } | |
1527 | ||
c97204ba JJ |
1528 | /** |
1529 | * | |
1530 | * Requires: @ns->lock held | |
1531 | */ | |
1532 | void __aafs_ns_rmdir(struct aa_ns *ns) | |
0d259f04 | 1533 | { |
98849dff | 1534 | struct aa_ns *sub; |
0d259f04 JJ |
1535 | struct aa_profile *child; |
1536 | int i; | |
1537 | ||
1538 | if (!ns) | |
1539 | return; | |
1540 | ||
1541 | list_for_each_entry(child, &ns->base.profiles, base.list) | |
c97204ba | 1542 | __aafs_profile_rmdir(child); |
0d259f04 JJ |
1543 | |
1544 | list_for_each_entry(sub, &ns->sub_ns, base.list) { | |
1545 | mutex_lock(&sub->lock); | |
c97204ba | 1546 | __aafs_ns_rmdir(sub); |
0d259f04 JJ |
1547 | mutex_unlock(&sub->lock); |
1548 | } | |
1549 | ||
5d5182ca JJ |
1550 | __aa_fs_list_remove_rawdata(ns); |
1551 | ||
b7fd2c03 JJ |
1552 | if (ns_subns_dir(ns)) { |
1553 | sub = d_inode(ns_subns_dir(ns))->i_private; | |
1554 | aa_put_ns(sub); | |
1555 | } | |
1556 | if (ns_subload(ns)) { | |
1557 | sub = d_inode(ns_subload(ns))->i_private; | |
1558 | aa_put_ns(sub); | |
1559 | } | |
1560 | if (ns_subreplace(ns)) { | |
1561 | sub = d_inode(ns_subreplace(ns))->i_private; | |
1562 | aa_put_ns(sub); | |
1563 | } | |
1564 | if (ns_subremove(ns)) { | |
1565 | sub = d_inode(ns_subremove(ns))->i_private; | |
1566 | aa_put_ns(sub); | |
1567 | } | |
d9bf2c26 JJ |
1568 | if (ns_subrevision(ns)) { |
1569 | sub = d_inode(ns_subrevision(ns))->i_private; | |
1570 | aa_put_ns(sub); | |
1571 | } | |
b7fd2c03 | 1572 | |
0d259f04 | 1573 | for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) { |
c961ee5f | 1574 | aafs_remove(ns->dents[i]); |
0d259f04 JJ |
1575 | ns->dents[i] = NULL; |
1576 | } | |
1577 | } | |
1578 | ||
b7fd2c03 | 1579 | /* assumes cleanup in caller */ |
c97204ba | 1580 | static int __aafs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir) |
b7fd2c03 JJ |
1581 | { |
1582 | struct dentry *dent; | |
1583 | ||
1584 | AA_BUG(!ns); | |
1585 | AA_BUG(!dir); | |
1586 | ||
c961ee5f | 1587 | dent = aafs_create_dir("profiles", dir); |
b7fd2c03 JJ |
1588 | if (IS_ERR(dent)) |
1589 | return PTR_ERR(dent); | |
1590 | ns_subprofs_dir(ns) = dent; | |
1591 | ||
c961ee5f | 1592 | dent = aafs_create_dir("raw_data", dir); |
b7fd2c03 JJ |
1593 | if (IS_ERR(dent)) |
1594 | return PTR_ERR(dent); | |
1595 | ns_subdata_dir(ns) = dent; | |
1596 | ||
d9bf2c26 JJ |
1597 | dent = aafs_create_file("revision", 0444, dir, ns, |
1598 | &aa_fs_ns_revision_fops); | |
1599 | if (IS_ERR(dent)) | |
1600 | return PTR_ERR(dent); | |
1601 | aa_get_ns(ns); | |
1602 | ns_subrevision(ns) = dent; | |
1603 | ||
c961ee5f | 1604 | dent = aafs_create_file(".load", 0640, dir, ns, |
b7fd2c03 JJ |
1605 | &aa_fs_profile_load); |
1606 | if (IS_ERR(dent)) | |
1607 | return PTR_ERR(dent); | |
1608 | aa_get_ns(ns); | |
1609 | ns_subload(ns) = dent; | |
1610 | ||
c961ee5f | 1611 | dent = aafs_create_file(".replace", 0640, dir, ns, |
b7fd2c03 JJ |
1612 | &aa_fs_profile_replace); |
1613 | if (IS_ERR(dent)) | |
1614 | return PTR_ERR(dent); | |
1615 | aa_get_ns(ns); | |
1616 | ns_subreplace(ns) = dent; | |
1617 | ||
c961ee5f | 1618 | dent = aafs_create_file(".remove", 0640, dir, ns, |
b7fd2c03 JJ |
1619 | &aa_fs_profile_remove); |
1620 | if (IS_ERR(dent)) | |
1621 | return PTR_ERR(dent); | |
1622 | aa_get_ns(ns); | |
1623 | ns_subremove(ns) = dent; | |
1624 | ||
4ae47f33 JJ |
1625 | /* use create_dentry so we can supply private data */ |
1626 | dent = aafs_create("namespaces", S_IFDIR | 0755, dir, ns, NULL, NULL, | |
1627 | &ns_dir_inode_operations); | |
b7fd2c03 JJ |
1628 | if (IS_ERR(dent)) |
1629 | return PTR_ERR(dent); | |
1630 | aa_get_ns(ns); | |
1631 | ns_subns_dir(ns) = dent; | |
1632 | ||
1633 | return 0; | |
1634 | } | |
1635 | ||
c97204ba JJ |
1636 | /* |
1637 | * Requires: @ns->lock held | |
1638 | */ | |
98407f0a JJ |
1639 | int __aafs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name, |
1640 | struct dentry *dent) | |
0d259f04 | 1641 | { |
98849dff | 1642 | struct aa_ns *sub; |
0d259f04 | 1643 | struct aa_profile *child; |
98407f0a | 1644 | struct dentry *dir; |
0d259f04 JJ |
1645 | int error; |
1646 | ||
b7fd2c03 JJ |
1647 | AA_BUG(!ns); |
1648 | AA_BUG(!parent); | |
1649 | AA_BUG(!mutex_is_locked(&ns->lock)); | |
1650 | ||
0d259f04 JJ |
1651 | if (!name) |
1652 | name = ns->base.name; | |
1653 | ||
c961ee5f JJ |
1654 | if (!dent) { |
1655 | /* create ns dir if it doesn't already exist */ | |
1656 | dent = aafs_create_dir(name, parent); | |
1657 | if (IS_ERR(dent)) | |
1658 | goto fail; | |
1659 | } else | |
1660 | dget(dent); | |
b7fd2c03 | 1661 | ns_dir(ns) = dir = dent; |
c97204ba | 1662 | error = __aafs_ns_mkdir_entries(ns, dir); |
b7fd2c03 JJ |
1663 | if (error) |
1664 | goto fail2; | |
0d259f04 | 1665 | |
b7fd2c03 | 1666 | /* profiles */ |
0d259f04 | 1667 | list_for_each_entry(child, &ns->base.profiles, base.list) { |
c97204ba | 1668 | error = __aafs_profile_mkdir(child, ns_subprofs_dir(ns)); |
0d259f04 JJ |
1669 | if (error) |
1670 | goto fail2; | |
1671 | } | |
1672 | ||
b7fd2c03 | 1673 | /* subnamespaces */ |
0d259f04 JJ |
1674 | list_for_each_entry(sub, &ns->sub_ns, base.list) { |
1675 | mutex_lock(&sub->lock); | |
98407f0a | 1676 | error = __aafs_ns_mkdir(sub, ns_subns_dir(ns), NULL, NULL); |
0d259f04 JJ |
1677 | mutex_unlock(&sub->lock); |
1678 | if (error) | |
1679 | goto fail2; | |
1680 | } | |
1681 | ||
1682 | return 0; | |
1683 | ||
1684 | fail: | |
1685 | error = PTR_ERR(dent); | |
1686 | ||
1687 | fail2: | |
c97204ba | 1688 | __aafs_ns_rmdir(ns); |
0d259f04 JJ |
1689 | |
1690 | return error; | |
1691 | } | |
1692 | ||
1693 | ||
29b3822f JJ |
1694 | #define list_entry_is_head(pos, head, member) (&pos->member == (head)) |
1695 | ||
1696 | /** | |
98849dff | 1697 | * __next_ns - find the next namespace to list |
29b3822f JJ |
1698 | * @root: root namespace to stop search at (NOT NULL) |
1699 | * @ns: current ns position (NOT NULL) | |
1700 | * | |
1701 | * Find the next namespace from @ns under @root and handle all locking needed | |
1702 | * while switching current namespace. | |
1703 | * | |
1704 | * Returns: next namespace or NULL if at last namespace under @root | |
1705 | * Requires: ns->parent->lock to be held | |
1706 | * NOTE: will not unlock root->lock | |
1707 | */ | |
98849dff | 1708 | static struct aa_ns *__next_ns(struct aa_ns *root, struct aa_ns *ns) |
29b3822f | 1709 | { |
98849dff | 1710 | struct aa_ns *parent, *next; |
29b3822f JJ |
1711 | |
1712 | /* is next namespace a child */ | |
1713 | if (!list_empty(&ns->sub_ns)) { | |
1714 | next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list); | |
1715 | mutex_lock(&next->lock); | |
1716 | return next; | |
1717 | } | |
1718 | ||
1719 | /* check if the next ns is a sibling, parent, gp, .. */ | |
1720 | parent = ns->parent; | |
ed2c7da3 | 1721 | while (ns != root) { |
29b3822f | 1722 | mutex_unlock(&ns->lock); |
38dbd7d8 | 1723 | next = list_next_entry(ns, base.list); |
29b3822f JJ |
1724 | if (!list_entry_is_head(next, &parent->sub_ns, base.list)) { |
1725 | mutex_lock(&next->lock); | |
1726 | return next; | |
1727 | } | |
29b3822f JJ |
1728 | ns = parent; |
1729 | parent = parent->parent; | |
1730 | } | |
1731 | ||
1732 | return NULL; | |
1733 | } | |
1734 | ||
1735 | /** | |
1736 | * __first_profile - find the first profile in a namespace | |
1737 | * @root: namespace that is root of profiles being displayed (NOT NULL) | |
1738 | * @ns: namespace to start in (NOT NULL) | |
1739 | * | |
1740 | * Returns: unrefcounted profile or NULL if no profile | |
1741 | * Requires: profile->ns.lock to be held | |
1742 | */ | |
98849dff JJ |
1743 | static struct aa_profile *__first_profile(struct aa_ns *root, |
1744 | struct aa_ns *ns) | |
29b3822f | 1745 | { |
98849dff | 1746 | for (; ns; ns = __next_ns(root, ns)) { |
29b3822f JJ |
1747 | if (!list_empty(&ns->base.profiles)) |
1748 | return list_first_entry(&ns->base.profiles, | |
1749 | struct aa_profile, base.list); | |
1750 | } | |
1751 | return NULL; | |
1752 | } | |
1753 | ||
1754 | /** | |
1755 | * __next_profile - step to the next profile in a profile tree | |
1756 | * @profile: current profile in tree (NOT NULL) | |
1757 | * | |
1758 | * Perform a depth first traversal on the profile tree in a namespace | |
1759 | * | |
1760 | * Returns: next profile or NULL if done | |
1761 | * Requires: profile->ns.lock to be held | |
1762 | */ | |
1763 | static struct aa_profile *__next_profile(struct aa_profile *p) | |
1764 | { | |
1765 | struct aa_profile *parent; | |
98849dff | 1766 | struct aa_ns *ns = p->ns; |
29b3822f JJ |
1767 | |
1768 | /* is next profile a child */ | |
1769 | if (!list_empty(&p->base.profiles)) | |
1770 | return list_first_entry(&p->base.profiles, typeof(*p), | |
1771 | base.list); | |
1772 | ||
1773 | /* is next profile a sibling, parent sibling, gp, sibling, .. */ | |
1774 | parent = rcu_dereference_protected(p->parent, | |
1775 | mutex_is_locked(&p->ns->lock)); | |
1776 | while (parent) { | |
38dbd7d8 | 1777 | p = list_next_entry(p, base.list); |
29b3822f JJ |
1778 | if (!list_entry_is_head(p, &parent->base.profiles, base.list)) |
1779 | return p; | |
1780 | p = parent; | |
1781 | parent = rcu_dereference_protected(parent->parent, | |
1782 | mutex_is_locked(&parent->ns->lock)); | |
1783 | } | |
1784 | ||
1785 | /* is next another profile in the namespace */ | |
38dbd7d8 | 1786 | p = list_next_entry(p, base.list); |
29b3822f JJ |
1787 | if (!list_entry_is_head(p, &ns->base.profiles, base.list)) |
1788 | return p; | |
1789 | ||
1790 | return NULL; | |
1791 | } | |
1792 | ||
1793 | /** | |
1794 | * next_profile - step to the next profile in where ever it may be | |
1795 | * @root: root namespace (NOT NULL) | |
1796 | * @profile: current profile (NOT NULL) | |
1797 | * | |
1798 | * Returns: next profile or NULL if there isn't one | |
1799 | */ | |
98849dff | 1800 | static struct aa_profile *next_profile(struct aa_ns *root, |
29b3822f JJ |
1801 | struct aa_profile *profile) |
1802 | { | |
1803 | struct aa_profile *next = __next_profile(profile); | |
1804 | if (next) | |
1805 | return next; | |
1806 | ||
1807 | /* finished all profiles in namespace move to next namespace */ | |
98849dff | 1808 | return __first_profile(root, __next_ns(root, profile->ns)); |
29b3822f JJ |
1809 | } |
1810 | ||
1811 | /** | |
1812 | * p_start - start a depth first traversal of profile tree | |
1813 | * @f: seq_file to fill | |
1814 | * @pos: current position | |
1815 | * | |
1816 | * Returns: first profile under current namespace or NULL if none found | |
1817 | * | |
1818 | * acquires first ns->lock | |
1819 | */ | |
1820 | static void *p_start(struct seq_file *f, loff_t *pos) | |
1821 | { | |
1822 | struct aa_profile *profile = NULL; | |
98849dff | 1823 | struct aa_ns *root = aa_current_profile()->ns; |
29b3822f | 1824 | loff_t l = *pos; |
98849dff | 1825 | f->private = aa_get_ns(root); |
29b3822f JJ |
1826 | |
1827 | ||
1828 | /* find the first profile */ | |
1829 | mutex_lock(&root->lock); | |
1830 | profile = __first_profile(root, root); | |
1831 | ||
1832 | /* skip to position */ | |
1833 | for (; profile && l > 0; l--) | |
1834 | profile = next_profile(root, profile); | |
1835 | ||
1836 | return profile; | |
1837 | } | |
1838 | ||
1839 | /** | |
1840 | * p_next - read the next profile entry | |
1841 | * @f: seq_file to fill | |
1842 | * @p: profile previously returned | |
1843 | * @pos: current position | |
1844 | * | |
1845 | * Returns: next profile after @p or NULL if none | |
1846 | * | |
1847 | * may acquire/release locks in namespace tree as necessary | |
1848 | */ | |
1849 | static void *p_next(struct seq_file *f, void *p, loff_t *pos) | |
1850 | { | |
1851 | struct aa_profile *profile = p; | |
98849dff | 1852 | struct aa_ns *ns = f->private; |
29b3822f JJ |
1853 | (*pos)++; |
1854 | ||
1855 | return next_profile(ns, profile); | |
1856 | } | |
1857 | ||
1858 | /** | |
1859 | * p_stop - stop depth first traversal | |
1860 | * @f: seq_file we are filling | |
1861 | * @p: the last profile writen | |
1862 | * | |
1863 | * Release all locking done by p_start/p_next on namespace tree | |
1864 | */ | |
1865 | static void p_stop(struct seq_file *f, void *p) | |
1866 | { | |
1867 | struct aa_profile *profile = p; | |
98849dff | 1868 | struct aa_ns *root = f->private, *ns; |
29b3822f JJ |
1869 | |
1870 | if (profile) { | |
1871 | for (ns = profile->ns; ns && ns != root; ns = ns->parent) | |
1872 | mutex_unlock(&ns->lock); | |
1873 | } | |
1874 | mutex_unlock(&root->lock); | |
98849dff | 1875 | aa_put_ns(root); |
29b3822f JJ |
1876 | } |
1877 | ||
1878 | /** | |
1879 | * seq_show_profile - show a profile entry | |
1880 | * @f: seq_file to file | |
1881 | * @p: current position (profile) (NOT NULL) | |
1882 | * | |
1883 | * Returns: error on failure | |
1884 | */ | |
1885 | static int seq_show_profile(struct seq_file *f, void *p) | |
1886 | { | |
1887 | struct aa_profile *profile = (struct aa_profile *)p; | |
98849dff | 1888 | struct aa_ns *root = f->private; |
29b3822f JJ |
1889 | |
1890 | if (profile->ns != root) | |
92b6d8ef | 1891 | seq_printf(f, ":%s://", aa_ns_name(root, profile->ns, true)); |
29b3822f JJ |
1892 | seq_printf(f, "%s (%s)\n", profile->base.hname, |
1893 | aa_profile_mode_names[profile->mode]); | |
1894 | ||
1895 | return 0; | |
1896 | } | |
1897 | ||
c97204ba | 1898 | static const struct seq_operations aa_sfs_profiles_op = { |
29b3822f JJ |
1899 | .start = p_start, |
1900 | .next = p_next, | |
1901 | .stop = p_stop, | |
1902 | .show = seq_show_profile, | |
1903 | }; | |
1904 | ||
1905 | static int profiles_open(struct inode *inode, struct file *file) | |
1906 | { | |
5ac8c355 JJ |
1907 | if (!policy_view_capable(NULL)) |
1908 | return -EACCES; | |
1909 | ||
c97204ba | 1910 | return seq_open(file, &aa_sfs_profiles_op); |
29b3822f JJ |
1911 | } |
1912 | ||
1913 | static int profiles_release(struct inode *inode, struct file *file) | |
1914 | { | |
1915 | return seq_release(inode, file); | |
1916 | } | |
1917 | ||
c97204ba | 1918 | static const struct file_operations aa_sfs_profiles_fops = { |
29b3822f JJ |
1919 | .open = profiles_open, |
1920 | .read = seq_read, | |
1921 | .llseek = seq_lseek, | |
1922 | .release = profiles_release, | |
1923 | }; | |
1924 | ||
1925 | ||
0d259f04 | 1926 | /** Base file system setup **/ |
c97204ba JJ |
1927 | static struct aa_sfs_entry aa_sfs_entry_file[] = { |
1928 | AA_SFS_FILE_STRING("mask", | |
1929 | "create read write exec append mmap_exec link lock"), | |
a9bf8e9f KC |
1930 | { } |
1931 | }; | |
1932 | ||
c97204ba JJ |
1933 | static struct aa_sfs_entry aa_sfs_entry_domain[] = { |
1934 | AA_SFS_FILE_BOOLEAN("change_hat", 1), | |
1935 | AA_SFS_FILE_BOOLEAN("change_hatv", 1), | |
1936 | AA_SFS_FILE_BOOLEAN("change_onexec", 1), | |
1937 | AA_SFS_FILE_BOOLEAN("change_profile", 1), | |
1938 | AA_SFS_FILE_BOOLEAN("fix_binfmt_elf_mmap", 1), | |
1939 | AA_SFS_FILE_STRING("version", "1.2"), | |
e74abcf3 KC |
1940 | { } |
1941 | }; | |
1942 | ||
c97204ba JJ |
1943 | static struct aa_sfs_entry aa_sfs_entry_versions[] = { |
1944 | AA_SFS_FILE_BOOLEAN("v5", 1), | |
474d6b75 JJ |
1945 | { } |
1946 | }; | |
1947 | ||
c97204ba JJ |
1948 | static struct aa_sfs_entry aa_sfs_entry_policy[] = { |
1949 | AA_SFS_DIR("versions", aa_sfs_entry_versions), | |
1950 | AA_SFS_FILE_BOOLEAN("set_load", 1), | |
474d6b75 | 1951 | { } |
9d910a3b JJ |
1952 | }; |
1953 | ||
a83bd86e JJ |
1954 | static struct aa_sfs_entry aa_sfs_entry_query_label[] = { |
1955 | AA_SFS_FILE_BOOLEAN("data", 1), | |
1dea3b41 | 1956 | AA_SFS_FILE_BOOLEAN("multi_transaction", 1), |
a83bd86e JJ |
1957 | { } |
1958 | }; | |
1959 | ||
1960 | static struct aa_sfs_entry aa_sfs_entry_query[] = { | |
1961 | AA_SFS_DIR("label", aa_sfs_entry_query_label), | |
1962 | { } | |
1963 | }; | |
c97204ba JJ |
1964 | static struct aa_sfs_entry aa_sfs_entry_features[] = { |
1965 | AA_SFS_DIR("policy", aa_sfs_entry_policy), | |
1966 | AA_SFS_DIR("domain", aa_sfs_entry_domain), | |
1967 | AA_SFS_DIR("file", aa_sfs_entry_file), | |
1968 | AA_SFS_FILE_U64("capability", VFS_CAP_FLAGS_MASK), | |
1969 | AA_SFS_DIR("rlimit", aa_sfs_entry_rlimit), | |
1970 | AA_SFS_DIR("caps", aa_sfs_entry_caps), | |
a83bd86e | 1971 | AA_SFS_DIR("query", aa_sfs_entry_query), |
e74abcf3 KC |
1972 | { } |
1973 | }; | |
1974 | ||
c97204ba JJ |
1975 | static struct aa_sfs_entry aa_sfs_entry_apparmor[] = { |
1976 | AA_SFS_FILE_FOPS(".access", 0640, &aa_sfs_access), | |
1977 | AA_SFS_FILE_FOPS(".ns_level", 0666, &seq_ns_level_fops), | |
1978 | AA_SFS_FILE_FOPS(".ns_name", 0640, &seq_ns_name_fops), | |
1979 | AA_SFS_FILE_FOPS("profiles", 0440, &aa_sfs_profiles_fops), | |
1980 | AA_SFS_DIR("features", aa_sfs_entry_features), | |
9acd494b KC |
1981 | { } |
1982 | }; | |
63e2b423 | 1983 | |
c97204ba JJ |
1984 | static struct aa_sfs_entry aa_sfs_entry = |
1985 | AA_SFS_DIR("apparmor", aa_sfs_entry_apparmor); | |
63e2b423 | 1986 | |
9acd494b | 1987 | /** |
a481f4d9 | 1988 | * entry_create_file - create a file entry in the apparmor securityfs |
c97204ba | 1989 | * @fs_file: aa_sfs_entry to build an entry for (NOT NULL) |
9acd494b KC |
1990 | * @parent: the parent dentry in the securityfs |
1991 | * | |
a481f4d9 | 1992 | * Use entry_remove_file to remove entries created with this fn. |
9acd494b | 1993 | */ |
c97204ba | 1994 | static int __init entry_create_file(struct aa_sfs_entry *fs_file, |
a481f4d9 | 1995 | struct dentry *parent) |
9acd494b KC |
1996 | { |
1997 | int error = 0; | |
1998 | ||
1999 | fs_file->dentry = securityfs_create_file(fs_file->name, | |
2000 | S_IFREG | fs_file->mode, | |
2001 | parent, fs_file, | |
2002 | fs_file->file_ops); | |
2003 | if (IS_ERR(fs_file->dentry)) { | |
2004 | error = PTR_ERR(fs_file->dentry); | |
2005 | fs_file->dentry = NULL; | |
63e2b423 | 2006 | } |
9acd494b | 2007 | return error; |
63e2b423 JJ |
2008 | } |
2009 | ||
c97204ba | 2010 | static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir); |
63e2b423 | 2011 | /** |
a481f4d9 | 2012 | * entry_create_dir - recursively create a directory entry in the securityfs |
c97204ba | 2013 | * @fs_dir: aa_sfs_entry (and all child entries) to build (NOT NULL) |
9acd494b | 2014 | * @parent: the parent dentry in the securityfs |
63e2b423 | 2015 | * |
a481f4d9 | 2016 | * Use entry_remove_dir to remove entries created with this fn. |
63e2b423 | 2017 | */ |
c97204ba JJ |
2018 | static int __init entry_create_dir(struct aa_sfs_entry *fs_dir, |
2019 | struct dentry *parent) | |
63e2b423 | 2020 | { |
c97204ba | 2021 | struct aa_sfs_entry *fs_file; |
0d259f04 JJ |
2022 | struct dentry *dir; |
2023 | int error; | |
63e2b423 | 2024 | |
0d259f04 JJ |
2025 | dir = securityfs_create_dir(fs_dir->name, parent); |
2026 | if (IS_ERR(dir)) | |
2027 | return PTR_ERR(dir); | |
2028 | fs_dir->dentry = dir; | |
63e2b423 | 2029 | |
0d259f04 | 2030 | for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) { |
c97204ba | 2031 | if (fs_file->v_type == AA_SFS_TYPE_DIR) |
a481f4d9 | 2032 | error = entry_create_dir(fs_file, fs_dir->dentry); |
9acd494b | 2033 | else |
a481f4d9 | 2034 | error = entry_create_file(fs_file, fs_dir->dentry); |
9acd494b KC |
2035 | if (error) |
2036 | goto failed; | |
2037 | } | |
2038 | ||
2039 | return 0; | |
2040 | ||
2041 | failed: | |
a481f4d9 | 2042 | entry_remove_dir(fs_dir); |
0d259f04 | 2043 | |
9acd494b KC |
2044 | return error; |
2045 | } | |
2046 | ||
2047 | /** | |
c97204ba JJ |
2048 | * entry_remove_file - drop a single file entry in the apparmor securityfs |
2049 | * @fs_file: aa_sfs_entry to detach from the securityfs (NOT NULL) | |
9acd494b | 2050 | */ |
c97204ba | 2051 | static void __init entry_remove_file(struct aa_sfs_entry *fs_file) |
9acd494b KC |
2052 | { |
2053 | if (!fs_file->dentry) | |
2054 | return; | |
2055 | ||
2056 | securityfs_remove(fs_file->dentry); | |
2057 | fs_file->dentry = NULL; | |
2058 | } | |
2059 | ||
2060 | /** | |
a481f4d9 | 2061 | * entry_remove_dir - recursively drop a directory entry from the securityfs |
c97204ba | 2062 | * @fs_dir: aa_sfs_entry (and all child entries) to detach (NOT NULL) |
9acd494b | 2063 | */ |
c97204ba | 2064 | static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir) |
9acd494b | 2065 | { |
c97204ba | 2066 | struct aa_sfs_entry *fs_file; |
9acd494b | 2067 | |
0d259f04 | 2068 | for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) { |
c97204ba | 2069 | if (fs_file->v_type == AA_SFS_TYPE_DIR) |
a481f4d9 | 2070 | entry_remove_dir(fs_file); |
9acd494b | 2071 | else |
c97204ba | 2072 | entry_remove_file(fs_file); |
9acd494b KC |
2073 | } |
2074 | ||
c97204ba | 2075 | entry_remove_file(fs_dir); |
63e2b423 JJ |
2076 | } |
2077 | ||
2078 | /** | |
2079 | * aa_destroy_aafs - cleanup and free aafs | |
2080 | * | |
2081 | * releases dentries allocated by aa_create_aafs | |
2082 | */ | |
2083 | void __init aa_destroy_aafs(void) | |
2084 | { | |
c97204ba | 2085 | entry_remove_dir(&aa_sfs_entry); |
63e2b423 JJ |
2086 | } |
2087 | ||
a71ada30 JJ |
2088 | |
2089 | #define NULL_FILE_NAME ".null" | |
2090 | struct path aa_null; | |
2091 | ||
2092 | static int aa_mk_null_file(struct dentry *parent) | |
2093 | { | |
2094 | struct vfsmount *mount = NULL; | |
2095 | struct dentry *dentry; | |
2096 | struct inode *inode; | |
2097 | int count = 0; | |
2098 | int error = simple_pin_fs(parent->d_sb->s_type, &mount, &count); | |
2099 | ||
2100 | if (error) | |
2101 | return error; | |
2102 | ||
2103 | inode_lock(d_inode(parent)); | |
2104 | dentry = lookup_one_len(NULL_FILE_NAME, parent, strlen(NULL_FILE_NAME)); | |
2105 | if (IS_ERR(dentry)) { | |
2106 | error = PTR_ERR(dentry); | |
2107 | goto out; | |
2108 | } | |
2109 | inode = new_inode(parent->d_inode->i_sb); | |
2110 | if (!inode) { | |
2111 | error = -ENOMEM; | |
2112 | goto out1; | |
2113 | } | |
2114 | ||
2115 | inode->i_ino = get_next_ino(); | |
2116 | inode->i_mode = S_IFCHR | S_IRUGO | S_IWUGO; | |
24d0d03c | 2117 | inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
a71ada30 JJ |
2118 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, |
2119 | MKDEV(MEM_MAJOR, 3)); | |
2120 | d_instantiate(dentry, inode); | |
2121 | aa_null.dentry = dget(dentry); | |
2122 | aa_null.mnt = mntget(mount); | |
2123 | ||
2124 | error = 0; | |
2125 | ||
2126 | out1: | |
2127 | dput(dentry); | |
2128 | out: | |
2129 | inode_unlock(d_inode(parent)); | |
2130 | simple_release_fs(&mount, &count); | |
2131 | return error; | |
2132 | } | |
2133 | ||
a481f4d9 JJ |
2134 | |
2135 | ||
2136 | static const char *policy_get_link(struct dentry *dentry, | |
2137 | struct inode *inode, | |
2138 | struct delayed_call *done) | |
2139 | { | |
2140 | struct aa_ns *ns; | |
2141 | struct path path; | |
2142 | ||
2143 | if (!dentry) | |
2144 | return ERR_PTR(-ECHILD); | |
2145 | ns = aa_get_current_ns(); | |
2146 | path.mnt = mntget(aafs_mnt); | |
2147 | path.dentry = dget(ns_dir(ns)); | |
2148 | nd_jump_link(&path); | |
2149 | aa_put_ns(ns); | |
2150 | ||
2151 | return NULL; | |
2152 | } | |
2153 | ||
2154 | static int ns_get_name(char *buf, size_t size, struct aa_ns *ns, | |
2155 | struct inode *inode) | |
2156 | { | |
2157 | int res = snprintf(buf, size, "%s:[%lu]", AAFS_NAME, inode->i_ino); | |
2158 | ||
2159 | if (res < 0 || res >= size) | |
2160 | res = -ENOENT; | |
2161 | ||
2162 | return res; | |
2163 | } | |
2164 | ||
2165 | static int policy_readlink(struct dentry *dentry, char __user *buffer, | |
2166 | int buflen) | |
2167 | { | |
2168 | struct aa_ns *ns; | |
2169 | char name[32]; | |
2170 | int res; | |
2171 | ||
2172 | ns = aa_get_current_ns(); | |
2173 | res = ns_get_name(name, sizeof(name), ns, d_inode(dentry)); | |
2174 | if (res >= 0) | |
2175 | res = readlink_copy(buffer, buflen, name); | |
2176 | aa_put_ns(ns); | |
2177 | ||
2178 | return res; | |
2179 | } | |
2180 | ||
2181 | static const struct inode_operations policy_link_iops = { | |
2182 | .readlink = policy_readlink, | |
2183 | .get_link = policy_get_link, | |
2184 | }; | |
2185 | ||
2186 | ||
63e2b423 JJ |
2187 | /** |
2188 | * aa_create_aafs - create the apparmor security filesystem | |
2189 | * | |
2190 | * dentries created here are released by aa_destroy_aafs | |
2191 | * | |
2192 | * Returns: error on failure | |
2193 | */ | |
3417d8d5 | 2194 | static int __init aa_create_aafs(void) |
63e2b423 | 2195 | { |
b7fd2c03 | 2196 | struct dentry *dent; |
63e2b423 JJ |
2197 | int error; |
2198 | ||
2199 | if (!apparmor_initialized) | |
2200 | return 0; | |
2201 | ||
c97204ba | 2202 | if (aa_sfs_entry.dentry) { |
63e2b423 JJ |
2203 | AA_ERROR("%s: AppArmor securityfs already exists\n", __func__); |
2204 | return -EEXIST; | |
2205 | } | |
2206 | ||
a481f4d9 JJ |
2207 | /* setup apparmorfs used to virtualize policy/ */ |
2208 | aafs_mnt = kern_mount(&aafs_ops); | |
2209 | if (IS_ERR(aafs_mnt)) | |
2210 | panic("can't set apparmorfs up\n"); | |
2211 | aafs_mnt->mnt_sb->s_flags &= ~MS_NOUSER; | |
2212 | ||
9acd494b | 2213 | /* Populate fs tree. */ |
c97204ba | 2214 | error = entry_create_dir(&aa_sfs_entry, NULL); |
63e2b423 JJ |
2215 | if (error) |
2216 | goto error; | |
2217 | ||
c97204ba | 2218 | dent = securityfs_create_file(".load", 0666, aa_sfs_entry.dentry, |
b7fd2c03 JJ |
2219 | NULL, &aa_fs_profile_load); |
2220 | if (IS_ERR(dent)) { | |
2221 | error = PTR_ERR(dent); | |
2222 | goto error; | |
2223 | } | |
2224 | ns_subload(root_ns) = dent; | |
2225 | ||
c97204ba | 2226 | dent = securityfs_create_file(".replace", 0666, aa_sfs_entry.dentry, |
b7fd2c03 JJ |
2227 | NULL, &aa_fs_profile_replace); |
2228 | if (IS_ERR(dent)) { | |
2229 | error = PTR_ERR(dent); | |
2230 | goto error; | |
2231 | } | |
2232 | ns_subreplace(root_ns) = dent; | |
2233 | ||
c97204ba | 2234 | dent = securityfs_create_file(".remove", 0666, aa_sfs_entry.dentry, |
b7fd2c03 JJ |
2235 | NULL, &aa_fs_profile_remove); |
2236 | if (IS_ERR(dent)) { | |
2237 | error = PTR_ERR(dent); | |
2238 | goto error; | |
2239 | } | |
2240 | ns_subremove(root_ns) = dent; | |
2241 | ||
d9bf2c26 JJ |
2242 | dent = securityfs_create_file("revision", 0444, aa_sfs_entry.dentry, |
2243 | NULL, &aa_fs_ns_revision_fops); | |
2244 | if (IS_ERR(dent)) { | |
2245 | error = PTR_ERR(dent); | |
2246 | goto error; | |
2247 | } | |
2248 | ns_subrevision(root_ns) = dent; | |
2249 | ||
2250 | /* policy tree referenced by magic policy symlink */ | |
b7fd2c03 | 2251 | mutex_lock(&root_ns->lock); |
c961ee5f JJ |
2252 | error = __aafs_ns_mkdir(root_ns, aafs_mnt->mnt_root, ".policy", |
2253 | aafs_mnt->mnt_root); | |
b7fd2c03 | 2254 | mutex_unlock(&root_ns->lock); |
0d259f04 JJ |
2255 | if (error) |
2256 | goto error; | |
2257 | ||
c961ee5f JJ |
2258 | /* magic symlink similar to nsfs redirects based on task policy */ |
2259 | dent = securityfs_create_symlink("policy", aa_sfs_entry.dentry, | |
2260 | NULL, &policy_link_iops); | |
2261 | if (IS_ERR(dent)) { | |
2262 | error = PTR_ERR(dent); | |
2263 | goto error; | |
2264 | } | |
2265 | ||
c97204ba | 2266 | error = aa_mk_null_file(aa_sfs_entry.dentry); |
a71ada30 JJ |
2267 | if (error) |
2268 | goto error; | |
2269 | ||
2270 | /* TODO: add default profile to apparmorfs */ | |
63e2b423 JJ |
2271 | |
2272 | /* Report that AppArmor fs is enabled */ | |
2273 | aa_info_message("AppArmor Filesystem Enabled"); | |
2274 | return 0; | |
2275 | ||
2276 | error: | |
2277 | aa_destroy_aafs(); | |
2278 | AA_ERROR("Error creating AppArmor securityfs\n"); | |
2279 | return error; | |
2280 | } | |
2281 | ||
2282 | fs_initcall(aa_create_aafs); |