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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" |
84632f19 | 35 | #include "include/ipc.h" |
d9bf2c26 | 36 | #include "include/policy_ns.h" |
317d9a05 | 37 | #include "include/label.h" |
63e2b423 | 38 | #include "include/policy.h" |
cff281f6 | 39 | #include "include/policy_ns.h" |
d384b0a1 | 40 | #include "include/resource.h" |
5ac8c355 | 41 | #include "include/policy_unpack.h" |
63e2b423 | 42 | |
c97204ba JJ |
43 | /* |
44 | * The apparmor filesystem interface used for policy load and introspection | |
45 | * The interface is split into two main components based on their function | |
46 | * a securityfs component: | |
47 | * used for static files that are always available, and which allows | |
48 | * userspace to specificy the location of the security filesystem. | |
49 | * | |
50 | * fns and data are prefixed with | |
51 | * aa_sfs_ | |
52 | * | |
53 | * an apparmorfs component: | |
54 | * used loaded policy content and introspection. It is not part of a | |
55 | * regular mounted filesystem and is available only through the magic | |
56 | * policy symlink in the root of the securityfs apparmor/ directory. | |
57 | * Tasks queries will be magically redirected to the correct portion | |
58 | * of the policy tree based on their confinement. | |
59 | * | |
60 | * fns and data are prefixed with | |
61 | * aafs_ | |
62 | * | |
63 | * The aa_fs_ prefix is used to indicate the fn is used by both the | |
64 | * securityfs and apparmorfs filesystems. | |
65 | */ | |
66 | ||
67 | ||
68 | /* | |
69 | * support fns | |
70 | */ | |
71 | ||
0d259f04 JJ |
72 | /** |
73 | * aa_mangle_name - mangle a profile name to std profile layout form | |
74 | * @name: profile name to mangle (NOT NULL) | |
75 | * @target: buffer to store mangled name, same length as @name (MAYBE NULL) | |
76 | * | |
77 | * Returns: length of mangled name | |
78 | */ | |
bbe4a7c8 | 79 | static int mangle_name(const char *name, char *target) |
0d259f04 JJ |
80 | { |
81 | char *t = target; | |
82 | ||
83 | while (*name == '/' || *name == '.') | |
84 | name++; | |
85 | ||
86 | if (target) { | |
87 | for (; *name; name++) { | |
88 | if (*name == '/') | |
89 | *(t)++ = '.'; | |
90 | else if (isspace(*name)) | |
91 | *(t)++ = '_'; | |
92 | else if (isalnum(*name) || strchr("._-", *name)) | |
93 | *(t)++ = *name; | |
94 | } | |
95 | ||
96 | *t = 0; | |
97 | } else { | |
98 | int len = 0; | |
99 | for (; *name; name++) { | |
100 | if (isalnum(*name) || isspace(*name) || | |
101 | strchr("/._-", *name)) | |
102 | len++; | |
103 | } | |
104 | ||
105 | return len; | |
106 | } | |
107 | ||
108 | return t - target; | |
109 | } | |
110 | ||
a481f4d9 JJ |
111 | |
112 | /* | |
113 | * aafs - core fns and data for the policy tree | |
114 | */ | |
115 | ||
116 | #define AAFS_NAME "apparmorfs" | |
117 | static struct vfsmount *aafs_mnt; | |
118 | static int aafs_count; | |
119 | ||
120 | ||
121 | static int aafs_show_path(struct seq_file *seq, struct dentry *dentry) | |
122 | { | |
123 | struct inode *inode = d_inode(dentry); | |
124 | ||
125 | seq_printf(seq, "%s:[%lu]", AAFS_NAME, inode->i_ino); | |
126 | return 0; | |
127 | } | |
128 | ||
129 | static void aafs_evict_inode(struct inode *inode) | |
130 | { | |
131 | truncate_inode_pages_final(&inode->i_data); | |
132 | clear_inode(inode); | |
133 | if (S_ISLNK(inode->i_mode)) | |
134 | kfree(inode->i_link); | |
135 | } | |
136 | ||
137 | static const struct super_operations aafs_super_ops = { | |
138 | .statfs = simple_statfs, | |
139 | .evict_inode = aafs_evict_inode, | |
140 | .show_path = aafs_show_path, | |
141 | }; | |
142 | ||
143 | static int fill_super(struct super_block *sb, void *data, int silent) | |
144 | { | |
145 | static struct tree_descr files[] = { {""} }; | |
146 | int error; | |
147 | ||
148 | error = simple_fill_super(sb, AAFS_MAGIC, files); | |
149 | if (error) | |
150 | return error; | |
151 | sb->s_op = &aafs_super_ops; | |
152 | ||
153 | return 0; | |
154 | } | |
155 | ||
156 | static struct dentry *aafs_mount(struct file_system_type *fs_type, | |
157 | int flags, const char *dev_name, void *data) | |
158 | { | |
159 | return mount_single(fs_type, flags, data, fill_super); | |
160 | } | |
161 | ||
162 | static struct file_system_type aafs_ops = { | |
163 | .owner = THIS_MODULE, | |
164 | .name = AAFS_NAME, | |
165 | .mount = aafs_mount, | |
166 | .kill_sb = kill_anon_super, | |
167 | }; | |
168 | ||
169 | /** | |
170 | * __aafs_setup_d_inode - basic inode setup for apparmorfs | |
171 | * @dir: parent directory for the dentry | |
172 | * @dentry: dentry we are seting the inode up for | |
173 | * @mode: permissions the file should have | |
174 | * @data: data to store on inode.i_private, available in open() | |
175 | * @link: if symlink, symlink target string | |
176 | * @fops: struct file_operations that should be used | |
177 | * @iops: struct of inode_operations that should be used | |
178 | */ | |
179 | static int __aafs_setup_d_inode(struct inode *dir, struct dentry *dentry, | |
180 | umode_t mode, void *data, char *link, | |
181 | const struct file_operations *fops, | |
182 | const struct inode_operations *iops) | |
183 | { | |
184 | struct inode *inode = new_inode(dir->i_sb); | |
185 | ||
186 | AA_BUG(!dir); | |
187 | AA_BUG(!dentry); | |
188 | ||
189 | if (!inode) | |
190 | return -ENOMEM; | |
191 | ||
192 | inode->i_ino = get_next_ino(); | |
193 | inode->i_mode = mode; | |
194 | inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); | |
195 | inode->i_private = data; | |
196 | if (S_ISDIR(mode)) { | |
197 | inode->i_op = iops ? iops : &simple_dir_inode_operations; | |
198 | inode->i_fop = &simple_dir_operations; | |
199 | inc_nlink(inode); | |
200 | inc_nlink(dir); | |
201 | } else if (S_ISLNK(mode)) { | |
202 | inode->i_op = iops ? iops : &simple_symlink_inode_operations; | |
203 | inode->i_link = link; | |
204 | } else { | |
205 | inode->i_fop = fops; | |
206 | } | |
207 | d_instantiate(dentry, inode); | |
208 | dget(dentry); | |
209 | ||
210 | return 0; | |
211 | } | |
212 | ||
213 | /** | |
214 | * aafs_create - create a dentry in the apparmorfs filesystem | |
215 | * | |
216 | * @name: name of dentry to create | |
217 | * @mode: permissions the file should have | |
218 | * @parent: parent directory for this dentry | |
219 | * @data: data to store on inode.i_private, available in open() | |
220 | * @link: if symlink, symlink target string | |
221 | * @fops: struct file_operations that should be used for | |
222 | * @iops: struct of inode_operations that should be used | |
223 | * | |
224 | * This is the basic "create a xxx" function for apparmorfs. | |
225 | * | |
226 | * Returns a pointer to a dentry if it succeeds, that must be free with | |
227 | * aafs_remove(). Will return ERR_PTR on failure. | |
228 | */ | |
229 | static struct dentry *aafs_create(const char *name, umode_t mode, | |
230 | struct dentry *parent, void *data, void *link, | |
231 | const struct file_operations *fops, | |
232 | const struct inode_operations *iops) | |
233 | { | |
234 | struct dentry *dentry; | |
235 | struct inode *dir; | |
236 | int error; | |
237 | ||
238 | AA_BUG(!name); | |
239 | AA_BUG(!parent); | |
240 | ||
241 | if (!(mode & S_IFMT)) | |
242 | mode = (mode & S_IALLUGO) | S_IFREG; | |
243 | ||
244 | error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count); | |
245 | if (error) | |
246 | return ERR_PTR(error); | |
247 | ||
248 | dir = d_inode(parent); | |
249 | ||
250 | inode_lock(dir); | |
251 | dentry = lookup_one_len(name, parent, strlen(name)); | |
c806027e DC |
252 | if (IS_ERR(dentry)) { |
253 | error = PTR_ERR(dentry); | |
a481f4d9 | 254 | goto fail_lock; |
c806027e | 255 | } |
a481f4d9 JJ |
256 | |
257 | if (d_really_is_positive(dentry)) { | |
258 | error = -EEXIST; | |
259 | goto fail_dentry; | |
260 | } | |
261 | ||
262 | error = __aafs_setup_d_inode(dir, dentry, mode, data, link, fops, iops); | |
263 | if (error) | |
264 | goto fail_dentry; | |
265 | inode_unlock(dir); | |
266 | ||
267 | return dentry; | |
268 | ||
269 | fail_dentry: | |
270 | dput(dentry); | |
271 | ||
272 | fail_lock: | |
273 | inode_unlock(dir); | |
274 | simple_release_fs(&aafs_mnt, &aafs_count); | |
275 | ||
276 | return ERR_PTR(error); | |
277 | } | |
278 | ||
279 | /** | |
280 | * aafs_create_file - create a file in the apparmorfs filesystem | |
281 | * | |
282 | * @name: name of dentry to create | |
283 | * @mode: permissions the file should have | |
284 | * @parent: parent directory for this dentry | |
285 | * @data: data to store on inode.i_private, available in open() | |
286 | * @fops: struct file_operations that should be used for | |
287 | * | |
288 | * see aafs_create | |
289 | */ | |
290 | static struct dentry *aafs_create_file(const char *name, umode_t mode, | |
291 | struct dentry *parent, void *data, | |
292 | const struct file_operations *fops) | |
293 | { | |
294 | return aafs_create(name, mode, parent, data, NULL, fops, NULL); | |
295 | } | |
296 | ||
297 | /** | |
298 | * aafs_create_dir - create a directory in the apparmorfs filesystem | |
299 | * | |
300 | * @name: name of dentry to create | |
301 | * @parent: parent directory for this dentry | |
302 | * | |
303 | * see aafs_create | |
304 | */ | |
305 | static struct dentry *aafs_create_dir(const char *name, struct dentry *parent) | |
306 | { | |
307 | return aafs_create(name, S_IFDIR | 0755, parent, NULL, NULL, NULL, | |
308 | NULL); | |
309 | } | |
310 | ||
311 | /** | |
312 | * aafs_create_symlink - create a symlink in the apparmorfs filesystem | |
313 | * @name: name of dentry to create | |
314 | * @parent: parent directory for this dentry | |
315 | * @target: if symlink, symlink target string | |
316 | * @iops: struct of inode_operations that should be used | |
317 | * | |
318 | * If @target parameter is %NULL, then the @iops parameter needs to be | |
319 | * setup to handle .readlink and .get_link inode_operations. | |
320 | */ | |
321 | static struct dentry *aafs_create_symlink(const char *name, | |
322 | struct dentry *parent, | |
323 | const char *target, | |
324 | const struct inode_operations *iops) | |
325 | { | |
326 | struct dentry *dent; | |
327 | char *link = NULL; | |
328 | ||
329 | if (target) { | |
330 | link = kstrdup(target, GFP_KERNEL); | |
331 | if (!link) | |
332 | return ERR_PTR(-ENOMEM); | |
333 | } | |
334 | dent = aafs_create(name, S_IFLNK | 0444, parent, NULL, link, NULL, | |
335 | iops); | |
336 | if (IS_ERR(dent)) | |
337 | kfree(link); | |
338 | ||
339 | return dent; | |
340 | } | |
341 | ||
342 | /** | |
343 | * aafs_remove - removes a file or directory from the apparmorfs filesystem | |
344 | * | |
345 | * @dentry: dentry of the file/directory/symlink to removed. | |
346 | */ | |
347 | static void aafs_remove(struct dentry *dentry) | |
348 | { | |
349 | struct inode *dir; | |
350 | ||
351 | if (!dentry || IS_ERR(dentry)) | |
352 | return; | |
353 | ||
354 | dir = d_inode(dentry->d_parent); | |
355 | inode_lock(dir); | |
356 | if (simple_positive(dentry)) { | |
357 | if (d_is_dir(dentry)) | |
358 | simple_rmdir(dir, dentry); | |
359 | else | |
360 | simple_unlink(dir, dentry); | |
361 | dput(dentry); | |
362 | } | |
363 | inode_unlock(dir); | |
364 | simple_release_fs(&aafs_mnt, &aafs_count); | |
365 | } | |
366 | ||
367 | ||
368 | /* | |
369 | * aa_fs - policy load/replace/remove | |
370 | */ | |
371 | ||
63e2b423 JJ |
372 | /** |
373 | * aa_simple_write_to_buffer - common routine for getting policy from user | |
63e2b423 | 374 | * @userbuf: user buffer to copy data from (NOT NULL) |
3ed02ada | 375 | * @alloc_size: size of user buffer (REQUIRES: @alloc_size >= @copy_size) |
63e2b423 JJ |
376 | * @copy_size: size of data to copy from user buffer |
377 | * @pos: position write is at in the file (NOT NULL) | |
378 | * | |
379 | * Returns: kernel buffer containing copy of user buffer data or an | |
380 | * ERR_PTR on failure. | |
381 | */ | |
5ef50d01 | 382 | static struct aa_loaddata *aa_simple_write_to_buffer(const char __user *userbuf, |
5ac8c355 JJ |
383 | size_t alloc_size, |
384 | size_t copy_size, | |
385 | loff_t *pos) | |
63e2b423 | 386 | { |
5ac8c355 | 387 | struct aa_loaddata *data; |
63e2b423 | 388 | |
e6bfa25d | 389 | AA_BUG(copy_size > alloc_size); |
3ed02ada | 390 | |
63e2b423 JJ |
391 | if (*pos != 0) |
392 | /* only writes from pos 0, that is complete writes */ | |
393 | return ERR_PTR(-ESPIPE); | |
394 | ||
63e2b423 | 395 | /* freed by caller to simple_write_to_buffer */ |
5d5182ca JJ |
396 | data = aa_loaddata_alloc(alloc_size); |
397 | if (IS_ERR(data)) | |
398 | return data; | |
63e2b423 | 399 | |
5d5182ca | 400 | data->size = copy_size; |
5ac8c355 | 401 | if (copy_from_user(data->data, userbuf, copy_size)) { |
63e2b423 JJ |
402 | kvfree(data); |
403 | return ERR_PTR(-EFAULT); | |
404 | } | |
405 | ||
406 | return data; | |
407 | } | |
408 | ||
18e99f19 | 409 | static ssize_t policy_update(u32 mask, const char __user *buf, size_t size, |
b7fd2c03 | 410 | loff_t *pos, struct aa_ns *ns) |
63e2b423 | 411 | { |
5ac8c355 | 412 | struct aa_loaddata *data; |
637f688d JJ |
413 | struct aa_label *label; |
414 | ssize_t error; | |
cf797c0e | 415 | |
637f688d | 416 | label = begin_current_label_crit_section(); |
cf797c0e | 417 | |
5ac8c355 JJ |
418 | /* high level check about policy management - fine grained in |
419 | * below after unpack | |
420 | */ | |
637f688d | 421 | error = aa_may_manage_policy(label, ns, mask); |
5ac8c355 JJ |
422 | if (error) |
423 | return error; | |
63e2b423 | 424 | |
5ef50d01 | 425 | data = aa_simple_write_to_buffer(buf, size, size, pos); |
63e2b423 JJ |
426 | error = PTR_ERR(data); |
427 | if (!IS_ERR(data)) { | |
637f688d | 428 | error = aa_replace_profiles(ns, label, mask, data); |
5ac8c355 | 429 | aa_put_loaddata(data); |
63e2b423 | 430 | } |
637f688d | 431 | end_current_label_crit_section(label); |
63e2b423 JJ |
432 | |
433 | return error; | |
434 | } | |
435 | ||
b7fd2c03 | 436 | /* .load file hook fn to load policy */ |
5ac8c355 JJ |
437 | static ssize_t profile_load(struct file *f, const char __user *buf, size_t size, |
438 | loff_t *pos) | |
439 | { | |
b7fd2c03 | 440 | struct aa_ns *ns = aa_get_ns(f->f_inode->i_private); |
18e99f19 | 441 | int error = policy_update(AA_MAY_LOAD_POLICY, buf, size, pos, ns); |
b7fd2c03 JJ |
442 | |
443 | aa_put_ns(ns); | |
5ac8c355 JJ |
444 | |
445 | return error; | |
446 | } | |
447 | ||
63e2b423 | 448 | static const struct file_operations aa_fs_profile_load = { |
6038f373 AB |
449 | .write = profile_load, |
450 | .llseek = default_llseek, | |
63e2b423 JJ |
451 | }; |
452 | ||
453 | /* .replace file hook fn to load and/or replace policy */ | |
454 | static ssize_t profile_replace(struct file *f, const char __user *buf, | |
455 | size_t size, loff_t *pos) | |
456 | { | |
b7fd2c03 | 457 | struct aa_ns *ns = aa_get_ns(f->f_inode->i_private); |
18e99f19 JJ |
458 | int error = policy_update(AA_MAY_LOAD_POLICY | AA_MAY_REPLACE_POLICY, |
459 | buf, size, pos, ns); | |
b7fd2c03 | 460 | aa_put_ns(ns); |
63e2b423 JJ |
461 | |
462 | return error; | |
463 | } | |
464 | ||
465 | static const struct file_operations aa_fs_profile_replace = { | |
6038f373 AB |
466 | .write = profile_replace, |
467 | .llseek = default_llseek, | |
63e2b423 JJ |
468 | }; |
469 | ||
b7fd2c03 | 470 | /* .remove file hook fn to remove loaded policy */ |
63e2b423 JJ |
471 | static ssize_t profile_remove(struct file *f, const char __user *buf, |
472 | size_t size, loff_t *pos) | |
473 | { | |
5ac8c355 | 474 | struct aa_loaddata *data; |
637f688d | 475 | struct aa_label *label; |
63e2b423 | 476 | ssize_t error; |
b7fd2c03 | 477 | struct aa_ns *ns = aa_get_ns(f->f_inode->i_private); |
63e2b423 | 478 | |
637f688d | 479 | label = begin_current_label_crit_section(); |
5ac8c355 JJ |
480 | /* high level check about policy management - fine grained in |
481 | * below after unpack | |
482 | */ | |
637f688d | 483 | error = aa_may_manage_policy(label, ns, AA_MAY_REMOVE_POLICY); |
5ac8c355 JJ |
484 | if (error) |
485 | goto out; | |
486 | ||
63e2b423 JJ |
487 | /* |
488 | * aa_remove_profile needs a null terminated string so 1 extra | |
489 | * byte is allocated and the copied data is null terminated. | |
490 | */ | |
5ef50d01 | 491 | data = aa_simple_write_to_buffer(buf, size + 1, size, pos); |
63e2b423 JJ |
492 | |
493 | error = PTR_ERR(data); | |
494 | if (!IS_ERR(data)) { | |
5ac8c355 | 495 | data->data[size] = 0; |
637f688d | 496 | error = aa_remove_profiles(ns, label, data->data, size); |
5ac8c355 | 497 | aa_put_loaddata(data); |
63e2b423 | 498 | } |
5ac8c355 | 499 | out: |
637f688d | 500 | end_current_label_crit_section(label); |
b7fd2c03 | 501 | aa_put_ns(ns); |
63e2b423 JJ |
502 | return error; |
503 | } | |
504 | ||
505 | static const struct file_operations aa_fs_profile_remove = { | |
6038f373 AB |
506 | .write = profile_remove, |
507 | .llseek = default_llseek, | |
63e2b423 JJ |
508 | }; |
509 | ||
d9bf2c26 JJ |
510 | struct aa_revision { |
511 | struct aa_ns *ns; | |
512 | long last_read; | |
513 | }; | |
514 | ||
515 | /* revision file hook fn for policy loads */ | |
516 | static int ns_revision_release(struct inode *inode, struct file *file) | |
517 | { | |
518 | struct aa_revision *rev = file->private_data; | |
519 | ||
520 | if (rev) { | |
521 | aa_put_ns(rev->ns); | |
522 | kfree(rev); | |
523 | } | |
524 | ||
525 | return 0; | |
526 | } | |
527 | ||
528 | static ssize_t ns_revision_read(struct file *file, char __user *buf, | |
529 | size_t size, loff_t *ppos) | |
530 | { | |
531 | struct aa_revision *rev = file->private_data; | |
532 | char buffer[32]; | |
533 | long last_read; | |
534 | int avail; | |
535 | ||
536 | mutex_lock(&rev->ns->lock); | |
537 | last_read = rev->last_read; | |
538 | if (last_read == rev->ns->revision) { | |
539 | mutex_unlock(&rev->ns->lock); | |
540 | if (file->f_flags & O_NONBLOCK) | |
541 | return -EAGAIN; | |
542 | if (wait_event_interruptible(rev->ns->wait, | |
543 | last_read != | |
544 | READ_ONCE(rev->ns->revision))) | |
545 | return -ERESTARTSYS; | |
546 | mutex_lock(&rev->ns->lock); | |
547 | } | |
548 | ||
549 | avail = sprintf(buffer, "%ld\n", rev->ns->revision); | |
550 | if (*ppos + size > avail) { | |
551 | rev->last_read = rev->ns->revision; | |
552 | *ppos = 0; | |
553 | } | |
554 | mutex_unlock(&rev->ns->lock); | |
555 | ||
556 | return simple_read_from_buffer(buf, size, ppos, buffer, avail); | |
557 | } | |
558 | ||
559 | static int ns_revision_open(struct inode *inode, struct file *file) | |
560 | { | |
561 | struct aa_revision *rev = kzalloc(sizeof(*rev), GFP_KERNEL); | |
562 | ||
563 | if (!rev) | |
564 | return -ENOMEM; | |
565 | ||
566 | rev->ns = aa_get_ns(inode->i_private); | |
567 | if (!rev->ns) | |
568 | rev->ns = aa_get_current_ns(); | |
569 | file->private_data = rev; | |
570 | ||
571 | return 0; | |
572 | } | |
573 | ||
574 | static unsigned int ns_revision_poll(struct file *file, poll_table *pt) | |
575 | { | |
576 | struct aa_revision *rev = file->private_data; | |
577 | unsigned int mask = 0; | |
578 | ||
579 | if (rev) { | |
580 | mutex_lock(&rev->ns->lock); | |
581 | poll_wait(file, &rev->ns->wait, pt); | |
582 | if (rev->last_read < rev->ns->revision) | |
583 | mask |= POLLIN | POLLRDNORM; | |
584 | mutex_unlock(&rev->ns->lock); | |
585 | } | |
586 | ||
587 | return mask; | |
588 | } | |
589 | ||
5d5182ca JJ |
590 | void __aa_bump_ns_revision(struct aa_ns *ns) |
591 | { | |
592 | ns->revision++; | |
d9bf2c26 | 593 | wake_up_interruptible(&ns->wait); |
5d5182ca JJ |
594 | } |
595 | ||
d9bf2c26 JJ |
596 | static const struct file_operations aa_fs_ns_revision_fops = { |
597 | .owner = THIS_MODULE, | |
598 | .open = ns_revision_open, | |
599 | .poll = ns_revision_poll, | |
600 | .read = ns_revision_read, | |
601 | .llseek = generic_file_llseek, | |
602 | .release = ns_revision_release, | |
603 | }; | |
604 | ||
4f3b3f2d JJ |
605 | static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms, |
606 | const char *match_str, size_t match_len) | |
607 | { | |
608 | struct aa_perms tmp; | |
609 | struct aa_dfa *dfa; | |
610 | unsigned int state = 0; | |
611 | ||
637f688d | 612 | if (profile_unconfined(profile)) |
4f3b3f2d JJ |
613 | return; |
614 | if (profile->file.dfa && *match_str == AA_CLASS_FILE) { | |
615 | dfa = profile->file.dfa; | |
616 | state = aa_dfa_match_len(dfa, profile->file.start, | |
617 | match_str + 1, match_len - 1); | |
618 | tmp = nullperms; | |
619 | if (state) { | |
620 | struct path_cond cond = { }; | |
621 | ||
622 | tmp = aa_compute_fperms(dfa, state, &cond); | |
623 | } | |
624 | } else if (profile->policy.dfa) { | |
625 | if (!PROFILE_MEDIATES_SAFE(profile, *match_str)) | |
626 | return; /* no change to current perms */ | |
627 | dfa = profile->policy.dfa; | |
628 | state = aa_dfa_match_len(dfa, profile->policy.start[0], | |
629 | match_str, match_len); | |
630 | if (state) | |
631 | aa_compute_perms(dfa, state, &tmp); | |
632 | else | |
633 | tmp = nullperms; | |
634 | } | |
635 | aa_apply_modes_to_perms(profile, &tmp); | |
317d9a05 | 636 | aa_perms_accum_raw(perms, &tmp); |
4f3b3f2d JJ |
637 | } |
638 | ||
639 | ||
e025be0f WH |
640 | /** |
641 | * query_data - queries a policy and writes its data to buf | |
642 | * @buf: the resulting data is stored here (NOT NULL) | |
643 | * @buf_len: size of buf | |
644 | * @query: query string used to retrieve data | |
645 | * @query_len: size of query including second NUL byte | |
646 | * | |
647 | * The buffers pointed to by buf and query may overlap. The query buffer is | |
648 | * parsed before buf is written to. | |
649 | * | |
650 | * The query should look like "<LABEL>\0<KEY>\0", where <LABEL> is the name of | |
651 | * the security confinement context and <KEY> is the name of the data to | |
652 | * retrieve. <LABEL> and <KEY> must not be NUL-terminated. | |
653 | * | |
654 | * Don't expect the contents of buf to be preserved on failure. | |
655 | * | |
656 | * Returns: number of characters written to buf or -errno on failure | |
657 | */ | |
658 | static ssize_t query_data(char *buf, size_t buf_len, | |
659 | char *query, size_t query_len) | |
660 | { | |
661 | char *out; | |
662 | const char *key; | |
317d9a05 | 663 | struct label_it i; |
637f688d | 664 | struct aa_label *label, *curr; |
317d9a05 | 665 | struct aa_profile *profile; |
e025be0f WH |
666 | struct aa_data *data; |
667 | u32 bytes, blocks; | |
668 | __le32 outle32; | |
669 | ||
670 | if (!query_len) | |
671 | return -EINVAL; /* need a query */ | |
672 | ||
673 | key = query + strnlen(query, query_len) + 1; | |
674 | if (key + 1 >= query + query_len) | |
675 | return -EINVAL; /* not enough space for a non-empty key */ | |
676 | if (key + strnlen(key, query + query_len - key) >= query + query_len) | |
677 | return -EINVAL; /* must end with NUL */ | |
678 | ||
679 | if (buf_len < sizeof(bytes) + sizeof(blocks)) | |
680 | return -EINVAL; /* not enough space */ | |
681 | ||
637f688d JJ |
682 | curr = begin_current_label_crit_section(); |
683 | label = aa_label_parse(curr, query, GFP_KERNEL, false, false); | |
684 | end_current_label_crit_section(curr); | |
685 | if (IS_ERR(label)) | |
686 | return PTR_ERR(label); | |
e025be0f WH |
687 | |
688 | /* We are going to leave space for two numbers. The first is the total | |
689 | * number of bytes we are writing after the first number. This is so | |
690 | * users can read the full output without reallocation. | |
691 | * | |
692 | * The second number is the number of data blocks we're writing. An | |
693 | * application might be confined by multiple policies having data in | |
694 | * the same key. | |
695 | */ | |
696 | memset(buf, 0, sizeof(bytes) + sizeof(blocks)); | |
697 | out = buf + sizeof(bytes) + sizeof(blocks); | |
698 | ||
699 | blocks = 0; | |
317d9a05 JJ |
700 | label_for_each_confined(i, label, profile) { |
701 | if (!profile->data) | |
702 | continue; | |
703 | ||
704 | data = rhashtable_lookup_fast(profile->data, &key, | |
705 | profile->data->p); | |
e025be0f WH |
706 | |
707 | if (data) { | |
317d9a05 JJ |
708 | if (out + sizeof(outle32) + data->size > buf + |
709 | buf_len) { | |
637f688d | 710 | aa_put_label(label); |
e025be0f | 711 | return -EINVAL; /* not enough space */ |
637f688d | 712 | } |
e025be0f WH |
713 | outle32 = __cpu_to_le32(data->size); |
714 | memcpy(out, &outle32, sizeof(outle32)); | |
715 | out += sizeof(outle32); | |
716 | memcpy(out, data->data, data->size); | |
717 | out += data->size; | |
718 | blocks++; | |
719 | } | |
720 | } | |
637f688d | 721 | aa_put_label(label); |
e025be0f WH |
722 | |
723 | outle32 = __cpu_to_le32(out - buf - sizeof(bytes)); | |
724 | memcpy(buf, &outle32, sizeof(outle32)); | |
725 | outle32 = __cpu_to_le32(blocks); | |
726 | memcpy(buf + sizeof(bytes), &outle32, sizeof(outle32)); | |
727 | ||
728 | return out - buf; | |
729 | } | |
730 | ||
4f3b3f2d JJ |
731 | /** |
732 | * query_label - queries a label and writes permissions to buf | |
733 | * @buf: the resulting permissions string is stored here (NOT NULL) | |
734 | * @buf_len: size of buf | |
735 | * @query: binary query string to match against the dfa | |
736 | * @query_len: size of query | |
737 | * @view_only: only compute for querier's view | |
738 | * | |
739 | * The buffers pointed to by buf and query may overlap. The query buffer is | |
740 | * parsed before buf is written to. | |
741 | * | |
742 | * The query should look like "LABEL_NAME\0DFA_STRING" where LABEL_NAME is | |
743 | * the name of the label, in the current namespace, that is to be queried and | |
744 | * DFA_STRING is a binary string to match against the label(s)'s DFA. | |
745 | * | |
746 | * LABEL_NAME must be NUL terminated. DFA_STRING may contain NUL characters | |
747 | * but must *not* be NUL terminated. | |
748 | * | |
749 | * Returns: number of characters written to buf or -errno on failure | |
750 | */ | |
751 | static ssize_t query_label(char *buf, size_t buf_len, | |
752 | char *query, size_t query_len, bool view_only) | |
753 | { | |
317d9a05 | 754 | struct aa_profile *profile; |
637f688d | 755 | struct aa_label *label, *curr; |
4f3b3f2d JJ |
756 | char *label_name, *match_str; |
757 | size_t label_name_len, match_len; | |
758 | struct aa_perms perms; | |
317d9a05 | 759 | struct label_it i; |
4f3b3f2d JJ |
760 | |
761 | if (!query_len) | |
762 | return -EINVAL; | |
763 | ||
764 | label_name = query; | |
765 | label_name_len = strnlen(query, query_len); | |
766 | if (!label_name_len || label_name_len == query_len) | |
767 | return -EINVAL; | |
768 | ||
769 | /** | |
770 | * The extra byte is to account for the null byte between the | |
771 | * profile name and dfa string. profile_name_len is greater | |
772 | * than zero and less than query_len, so a byte can be safely | |
773 | * added or subtracted. | |
774 | */ | |
775 | match_str = label_name + label_name_len + 1; | |
776 | match_len = query_len - label_name_len - 1; | |
777 | ||
637f688d JJ |
778 | curr = begin_current_label_crit_section(); |
779 | label = aa_label_parse(curr, label_name, GFP_KERNEL, false, false); | |
780 | end_current_label_crit_section(curr); | |
781 | if (IS_ERR(label)) | |
782 | return PTR_ERR(label); | |
4f3b3f2d JJ |
783 | |
784 | perms = allperms; | |
317d9a05 JJ |
785 | if (view_only) { |
786 | label_for_each_in_ns(i, labels_ns(label), label, profile) { | |
787 | profile_query_cb(profile, &perms, match_str, match_len); | |
788 | } | |
789 | } else { | |
790 | label_for_each(i, label, profile) { | |
791 | profile_query_cb(profile, &perms, match_str, match_len); | |
792 | } | |
793 | } | |
794 | aa_put_label(label); | |
4f3b3f2d JJ |
795 | |
796 | return scnprintf(buf, buf_len, | |
797 | "allow 0x%08x\ndeny 0x%08x\naudit 0x%08x\nquiet 0x%08x\n", | |
798 | perms.allow, perms.deny, perms.audit, perms.quiet); | |
799 | } | |
800 | ||
1dea3b41 JJ |
801 | /* |
802 | * Transaction based IO. | |
803 | * The file expects a write which triggers the transaction, and then | |
804 | * possibly a read(s) which collects the result - which is stored in a | |
805 | * file-local buffer. Once a new write is performed, a new set of results | |
806 | * are stored in the file-local buffer. | |
807 | */ | |
808 | struct multi_transaction { | |
809 | struct kref count; | |
810 | ssize_t size; | |
811 | char data[0]; | |
812 | }; | |
813 | ||
814 | #define MULTI_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct multi_transaction)) | |
815 | /* TODO: replace with per file lock */ | |
816 | static DEFINE_SPINLOCK(multi_transaction_lock); | |
817 | ||
818 | static void multi_transaction_kref(struct kref *kref) | |
819 | { | |
820 | struct multi_transaction *t; | |
821 | ||
822 | t = container_of(kref, struct multi_transaction, count); | |
823 | free_page((unsigned long) t); | |
824 | } | |
825 | ||
826 | static struct multi_transaction * | |
827 | get_multi_transaction(struct multi_transaction *t) | |
828 | { | |
829 | if (t) | |
830 | kref_get(&(t->count)); | |
831 | ||
832 | return t; | |
833 | } | |
834 | ||
835 | static void put_multi_transaction(struct multi_transaction *t) | |
836 | { | |
837 | if (t) | |
838 | kref_put(&(t->count), multi_transaction_kref); | |
839 | } | |
840 | ||
841 | /* does not increment @new's count */ | |
842 | static void multi_transaction_set(struct file *file, | |
843 | struct multi_transaction *new, size_t n) | |
844 | { | |
845 | struct multi_transaction *old; | |
846 | ||
847 | AA_BUG(n > MULTI_TRANSACTION_LIMIT); | |
848 | ||
849 | new->size = n; | |
850 | spin_lock(&multi_transaction_lock); | |
851 | old = (struct multi_transaction *) file->private_data; | |
852 | file->private_data = new; | |
853 | spin_unlock(&multi_transaction_lock); | |
854 | put_multi_transaction(old); | |
855 | } | |
856 | ||
857 | static struct multi_transaction *multi_transaction_new(struct file *file, | |
858 | const char __user *buf, | |
859 | size_t size) | |
860 | { | |
861 | struct multi_transaction *t; | |
862 | ||
863 | if (size > MULTI_TRANSACTION_LIMIT - 1) | |
864 | return ERR_PTR(-EFBIG); | |
865 | ||
866 | t = (struct multi_transaction *)get_zeroed_page(GFP_KERNEL); | |
867 | if (!t) | |
868 | return ERR_PTR(-ENOMEM); | |
869 | kref_init(&t->count); | |
870 | if (copy_from_user(t->data, buf, size)) | |
871 | return ERR_PTR(-EFAULT); | |
872 | ||
873 | return t; | |
874 | } | |
875 | ||
876 | static ssize_t multi_transaction_read(struct file *file, char __user *buf, | |
877 | size_t size, loff_t *pos) | |
878 | { | |
879 | struct multi_transaction *t; | |
880 | ssize_t ret; | |
881 | ||
882 | spin_lock(&multi_transaction_lock); | |
883 | t = get_multi_transaction(file->private_data); | |
884 | spin_unlock(&multi_transaction_lock); | |
885 | if (!t) | |
886 | return 0; | |
887 | ||
888 | ret = simple_read_from_buffer(buf, size, pos, t->data, t->size); | |
889 | put_multi_transaction(t); | |
890 | ||
891 | return ret; | |
892 | } | |
893 | ||
894 | static int multi_transaction_release(struct inode *inode, struct file *file) | |
895 | { | |
896 | put_multi_transaction(file->private_data); | |
897 | ||
898 | return 0; | |
899 | } | |
900 | ||
317d9a05 JJ |
901 | #define QUERY_CMD_LABEL "label\0" |
902 | #define QUERY_CMD_LABEL_LEN 6 | |
4f3b3f2d JJ |
903 | #define QUERY_CMD_PROFILE "profile\0" |
904 | #define QUERY_CMD_PROFILE_LEN 8 | |
317d9a05 JJ |
905 | #define QUERY_CMD_LABELALL "labelall\0" |
906 | #define QUERY_CMD_LABELALL_LEN 9 | |
e025be0f WH |
907 | #define QUERY_CMD_DATA "data\0" |
908 | #define QUERY_CMD_DATA_LEN 5 | |
909 | ||
910 | /** | |
911 | * aa_write_access - generic permissions and data query | |
912 | * @file: pointer to open apparmorfs/access file | |
913 | * @ubuf: user buffer containing the complete query string (NOT NULL) | |
914 | * @count: size of ubuf | |
915 | * @ppos: position in the file (MUST BE ZERO) | |
916 | * | |
917 | * Allows for one permissions or data query per open(), write(), and read() | |
918 | * sequence. The only queries currently supported are label-based queries for | |
919 | * permissions or data. | |
920 | * | |
921 | * For permissions queries, ubuf must begin with "label\0", followed by the | |
922 | * profile query specific format described in the query_label() function | |
923 | * documentation. | |
924 | * | |
925 | * For data queries, ubuf must have the form "data\0<LABEL>\0<KEY>\0", where | |
926 | * <LABEL> is the name of the security confinement context and <KEY> is the | |
927 | * name of the data to retrieve. | |
928 | * | |
929 | * Returns: number of bytes written or -errno on failure | |
930 | */ | |
931 | static ssize_t aa_write_access(struct file *file, const char __user *ubuf, | |
932 | size_t count, loff_t *ppos) | |
933 | { | |
1dea3b41 | 934 | struct multi_transaction *t; |
e025be0f WH |
935 | ssize_t len; |
936 | ||
937 | if (*ppos) | |
938 | return -ESPIPE; | |
939 | ||
1dea3b41 JJ |
940 | t = multi_transaction_new(file, ubuf, count); |
941 | if (IS_ERR(t)) | |
942 | return PTR_ERR(t); | |
e025be0f | 943 | |
4f3b3f2d JJ |
944 | if (count > QUERY_CMD_PROFILE_LEN && |
945 | !memcmp(t->data, QUERY_CMD_PROFILE, QUERY_CMD_PROFILE_LEN)) { | |
946 | len = query_label(t->data, MULTI_TRANSACTION_LIMIT, | |
947 | t->data + QUERY_CMD_PROFILE_LEN, | |
948 | count - QUERY_CMD_PROFILE_LEN, true); | |
317d9a05 JJ |
949 | } else if (count > QUERY_CMD_LABEL_LEN && |
950 | !memcmp(t->data, QUERY_CMD_LABEL, QUERY_CMD_LABEL_LEN)) { | |
951 | len = query_label(t->data, MULTI_TRANSACTION_LIMIT, | |
952 | t->data + QUERY_CMD_LABEL_LEN, | |
953 | count - QUERY_CMD_LABEL_LEN, true); | |
954 | } else if (count > QUERY_CMD_LABELALL_LEN && | |
955 | !memcmp(t->data, QUERY_CMD_LABELALL, | |
956 | QUERY_CMD_LABELALL_LEN)) { | |
957 | len = query_label(t->data, MULTI_TRANSACTION_LIMIT, | |
958 | t->data + QUERY_CMD_LABELALL_LEN, | |
959 | count - QUERY_CMD_LABELALL_LEN, false); | |
4f3b3f2d | 960 | } else if (count > QUERY_CMD_DATA_LEN && |
1dea3b41 JJ |
961 | !memcmp(t->data, QUERY_CMD_DATA, QUERY_CMD_DATA_LEN)) { |
962 | len = query_data(t->data, MULTI_TRANSACTION_LIMIT, | |
963 | t->data + QUERY_CMD_DATA_LEN, | |
e025be0f WH |
964 | count - QUERY_CMD_DATA_LEN); |
965 | } else | |
966 | len = -EINVAL; | |
967 | ||
1dea3b41 JJ |
968 | if (len < 0) { |
969 | put_multi_transaction(t); | |
e025be0f | 970 | return len; |
1dea3b41 | 971 | } |
e025be0f | 972 | |
1dea3b41 | 973 | multi_transaction_set(file, t, len); |
e025be0f WH |
974 | |
975 | return count; | |
976 | } | |
977 | ||
c97204ba | 978 | static const struct file_operations aa_sfs_access = { |
e025be0f | 979 | .write = aa_write_access, |
1dea3b41 JJ |
980 | .read = multi_transaction_read, |
981 | .release = multi_transaction_release, | |
e025be0f WH |
982 | .llseek = generic_file_llseek, |
983 | }; | |
984 | ||
c97204ba | 985 | static int aa_sfs_seq_show(struct seq_file *seq, void *v) |
e74abcf3 | 986 | { |
c97204ba | 987 | struct aa_sfs_entry *fs_file = seq->private; |
e74abcf3 KC |
988 | |
989 | if (!fs_file) | |
990 | return 0; | |
991 | ||
992 | switch (fs_file->v_type) { | |
c97204ba | 993 | case AA_SFS_TYPE_BOOLEAN: |
e74abcf3 KC |
994 | seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no"); |
995 | break; | |
c97204ba | 996 | case AA_SFS_TYPE_STRING: |
a9bf8e9f KC |
997 | seq_printf(seq, "%s\n", fs_file->v.string); |
998 | break; | |
c97204ba | 999 | case AA_SFS_TYPE_U64: |
e74abcf3 KC |
1000 | seq_printf(seq, "%#08lx\n", fs_file->v.u64); |
1001 | break; | |
1002 | default: | |
1003 | /* Ignore unpritable entry types. */ | |
1004 | break; | |
1005 | } | |
1006 | ||
1007 | return 0; | |
1008 | } | |
1009 | ||
c97204ba | 1010 | static int aa_sfs_seq_open(struct inode *inode, struct file *file) |
e74abcf3 | 1011 | { |
c97204ba | 1012 | return single_open(file, aa_sfs_seq_show, inode->i_private); |
e74abcf3 KC |
1013 | } |
1014 | ||
c97204ba | 1015 | const struct file_operations aa_sfs_seq_file_ops = { |
e74abcf3 | 1016 | .owner = THIS_MODULE, |
c97204ba | 1017 | .open = aa_sfs_seq_open, |
e74abcf3 KC |
1018 | .read = seq_read, |
1019 | .llseek = seq_lseek, | |
1020 | .release = single_release, | |
1021 | }; | |
1022 | ||
52b97de3 JJ |
1023 | /* |
1024 | * profile based file operations | |
1025 | * policy/profiles/XXXX/profiles/ * | |
1026 | */ | |
1027 | ||
1028 | #define SEQ_PROFILE_FOPS(NAME) \ | |
1029 | static int seq_profile_ ##NAME ##_open(struct inode *inode, struct file *file)\ | |
1030 | { \ | |
1031 | return seq_profile_open(inode, file, seq_profile_ ##NAME ##_show); \ | |
1032 | } \ | |
1033 | \ | |
1034 | static const struct file_operations seq_profile_ ##NAME ##_fops = { \ | |
1035 | .owner = THIS_MODULE, \ | |
1036 | .open = seq_profile_ ##NAME ##_open, \ | |
1037 | .read = seq_read, \ | |
1038 | .llseek = seq_lseek, \ | |
1039 | .release = seq_profile_release, \ | |
1040 | } \ | |
1041 | ||
1042 | static int seq_profile_open(struct inode *inode, struct file *file, | |
1043 | int (*show)(struct seq_file *, void *)) | |
0d259f04 | 1044 | { |
8399588a JJ |
1045 | struct aa_proxy *proxy = aa_get_proxy(inode->i_private); |
1046 | int error = single_open(file, show, proxy); | |
0d259f04 JJ |
1047 | |
1048 | if (error) { | |
1049 | file->private_data = NULL; | |
8399588a | 1050 | aa_put_proxy(proxy); |
0d259f04 JJ |
1051 | } |
1052 | ||
1053 | return error; | |
1054 | } | |
1055 | ||
52b97de3 | 1056 | static int seq_profile_release(struct inode *inode, struct file *file) |
0d259f04 JJ |
1057 | { |
1058 | struct seq_file *seq = (struct seq_file *) file->private_data; | |
1059 | if (seq) | |
8399588a | 1060 | aa_put_proxy(seq->private); |
0d259f04 JJ |
1061 | return single_release(inode, file); |
1062 | } | |
1063 | ||
52b97de3 | 1064 | static int seq_profile_name_show(struct seq_file *seq, void *v) |
0d259f04 | 1065 | { |
8399588a | 1066 | struct aa_proxy *proxy = seq->private; |
637f688d JJ |
1067 | struct aa_label *label = aa_get_label_rcu(&proxy->label); |
1068 | struct aa_profile *profile = labels_profile(label); | |
0d259f04 | 1069 | seq_printf(seq, "%s\n", profile->base.name); |
637f688d | 1070 | aa_put_label(label); |
0d259f04 JJ |
1071 | |
1072 | return 0; | |
1073 | } | |
1074 | ||
52b97de3 | 1075 | static int seq_profile_mode_show(struct seq_file *seq, void *v) |
0d259f04 | 1076 | { |
8399588a | 1077 | struct aa_proxy *proxy = seq->private; |
637f688d JJ |
1078 | struct aa_label *label = aa_get_label_rcu(&proxy->label); |
1079 | struct aa_profile *profile = labels_profile(label); | |
0d259f04 | 1080 | seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]); |
637f688d | 1081 | aa_put_label(label); |
0d259f04 JJ |
1082 | |
1083 | return 0; | |
1084 | } | |
1085 | ||
52b97de3 | 1086 | static int seq_profile_attach_show(struct seq_file *seq, void *v) |
556d0be7 | 1087 | { |
8399588a | 1088 | struct aa_proxy *proxy = seq->private; |
637f688d JJ |
1089 | struct aa_label *label = aa_get_label_rcu(&proxy->label); |
1090 | struct aa_profile *profile = labels_profile(label); | |
556d0be7 JJ |
1091 | if (profile->attach) |
1092 | seq_printf(seq, "%s\n", profile->attach); | |
1093 | else if (profile->xmatch) | |
1094 | seq_puts(seq, "<unknown>\n"); | |
1095 | else | |
1096 | seq_printf(seq, "%s\n", profile->base.name); | |
637f688d | 1097 | aa_put_label(label); |
556d0be7 JJ |
1098 | |
1099 | return 0; | |
1100 | } | |
1101 | ||
52b97de3 | 1102 | static int seq_profile_hash_show(struct seq_file *seq, void *v) |
f8eb8a13 | 1103 | { |
8399588a | 1104 | struct aa_proxy *proxy = seq->private; |
637f688d JJ |
1105 | struct aa_label *label = aa_get_label_rcu(&proxy->label); |
1106 | struct aa_profile *profile = labels_profile(label); | |
f8eb8a13 JJ |
1107 | unsigned int i, size = aa_hash_size(); |
1108 | ||
1109 | if (profile->hash) { | |
1110 | for (i = 0; i < size; i++) | |
1111 | seq_printf(seq, "%.2x", profile->hash[i]); | |
47dbd1cd | 1112 | seq_putc(seq, '\n'); |
f8eb8a13 | 1113 | } |
637f688d | 1114 | aa_put_label(label); |
f8eb8a13 JJ |
1115 | |
1116 | return 0; | |
1117 | } | |
1118 | ||
52b97de3 JJ |
1119 | SEQ_PROFILE_FOPS(name); |
1120 | SEQ_PROFILE_FOPS(mode); | |
1121 | SEQ_PROFILE_FOPS(attach); | |
1122 | SEQ_PROFILE_FOPS(hash); | |
f8eb8a13 | 1123 | |
64c86970 JJ |
1124 | /* |
1125 | * namespace based files | |
1126 | * several root files and | |
1127 | * policy/ * | |
1128 | */ | |
f8eb8a13 | 1129 | |
64c86970 JJ |
1130 | #define SEQ_NS_FOPS(NAME) \ |
1131 | static int seq_ns_ ##NAME ##_open(struct inode *inode, struct file *file) \ | |
1132 | { \ | |
1133 | return single_open(file, seq_ns_ ##NAME ##_show, inode->i_private); \ | |
1134 | } \ | |
1135 | \ | |
1136 | static const struct file_operations seq_ns_ ##NAME ##_fops = { \ | |
1137 | .owner = THIS_MODULE, \ | |
1138 | .open = seq_ns_ ##NAME ##_open, \ | |
1139 | .read = seq_read, \ | |
1140 | .llseek = seq_lseek, \ | |
1141 | .release = single_release, \ | |
1142 | } \ | |
3e3e5695 | 1143 | |
40cde7fc JJ |
1144 | static int seq_ns_stacked_show(struct seq_file *seq, void *v) |
1145 | { | |
1146 | struct aa_label *label; | |
1147 | ||
1148 | label = begin_current_label_crit_section(); | |
1149 | seq_printf(seq, "%s\n", label->size > 1 ? "yes" : "no"); | |
1150 | end_current_label_crit_section(label); | |
1151 | ||
1152 | return 0; | |
1153 | } | |
1154 | ||
1155 | static int seq_ns_nsstacked_show(struct seq_file *seq, void *v) | |
1156 | { | |
1157 | struct aa_label *label; | |
1158 | struct aa_profile *profile; | |
1159 | struct label_it it; | |
1160 | int count = 1; | |
1161 | ||
1162 | label = begin_current_label_crit_section(); | |
1163 | ||
1164 | if (label->size > 1) { | |
1165 | label_for_each(it, label, profile) | |
1166 | if (profile->ns != labels_ns(label)) { | |
1167 | count++; | |
1168 | break; | |
1169 | } | |
1170 | } | |
1171 | ||
1172 | seq_printf(seq, "%s\n", count > 1 ? "yes" : "no"); | |
1173 | end_current_label_crit_section(label); | |
1174 | ||
1175 | return 0; | |
1176 | } | |
1177 | ||
64c86970 | 1178 | static int seq_ns_level_show(struct seq_file *seq, void *v) |
a71ada30 | 1179 | { |
637f688d | 1180 | struct aa_label *label; |
a71ada30 | 1181 | |
637f688d JJ |
1182 | label = begin_current_label_crit_section(); |
1183 | seq_printf(seq, "%d\n", labels_ns(label)->level); | |
1184 | end_current_label_crit_section(label); | |
a71ada30 JJ |
1185 | |
1186 | return 0; | |
1187 | } | |
1188 | ||
64c86970 | 1189 | static int seq_ns_name_show(struct seq_file *seq, void *v) |
3e3e5695 | 1190 | { |
637f688d | 1191 | struct aa_label *label = begin_current_label_crit_section(); |
126a371a | 1192 | seq_printf(seq, "%s\n", labels_ns(label)->base.name); |
637f688d | 1193 | end_current_label_crit_section(label); |
3e3e5695 JJ |
1194 | |
1195 | return 0; | |
1196 | } | |
1197 | ||
40cde7fc JJ |
1198 | SEQ_NS_FOPS(stacked); |
1199 | SEQ_NS_FOPS(nsstacked); | |
64c86970 JJ |
1200 | SEQ_NS_FOPS(level); |
1201 | SEQ_NS_FOPS(name); | |
3e3e5695 | 1202 | |
5d5182ca JJ |
1203 | |
1204 | /* policy/raw_data/ * file ops */ | |
1205 | ||
1206 | #define SEQ_RAWDATA_FOPS(NAME) \ | |
1207 | static int seq_rawdata_ ##NAME ##_open(struct inode *inode, struct file *file)\ | |
1208 | { \ | |
1209 | return seq_rawdata_open(inode, file, seq_rawdata_ ##NAME ##_show); \ | |
1210 | } \ | |
1211 | \ | |
1212 | static const struct file_operations seq_rawdata_ ##NAME ##_fops = { \ | |
1213 | .owner = THIS_MODULE, \ | |
1214 | .open = seq_rawdata_ ##NAME ##_open, \ | |
1215 | .read = seq_read, \ | |
1216 | .llseek = seq_lseek, \ | |
1217 | .release = seq_rawdata_release, \ | |
1218 | } \ | |
1219 | ||
1220 | static int seq_rawdata_open(struct inode *inode, struct file *file, | |
1221 | int (*show)(struct seq_file *, void *)) | |
5ac8c355 | 1222 | { |
5d5182ca JJ |
1223 | struct aa_loaddata *data = __aa_get_loaddata(inode->i_private); |
1224 | int error; | |
5ac8c355 | 1225 | |
5d5182ca JJ |
1226 | if (!data) |
1227 | /* lost race this ent is being reaped */ | |
1228 | return -ENOENT; | |
1229 | ||
1230 | error = single_open(file, show, data); | |
1231 | if (error) { | |
1232 | AA_BUG(file->private_data && | |
1233 | ((struct seq_file *)file->private_data)->private); | |
1234 | aa_put_loaddata(data); | |
1235 | } | |
1236 | ||
1237 | return error; | |
5ac8c355 JJ |
1238 | } |
1239 | ||
5d5182ca | 1240 | static int seq_rawdata_release(struct inode *inode, struct file *file) |
5ac8c355 | 1241 | { |
5d5182ca | 1242 | struct seq_file *seq = (struct seq_file *) file->private_data; |
5ac8c355 | 1243 | |
5d5182ca JJ |
1244 | if (seq) |
1245 | aa_put_loaddata(seq->private); | |
0ff3d97f | 1246 | |
5d5182ca JJ |
1247 | return single_release(inode, file); |
1248 | } | |
1249 | ||
1250 | static int seq_rawdata_abi_show(struct seq_file *seq, void *v) | |
1251 | { | |
1252 | struct aa_loaddata *data = seq->private; | |
1253 | ||
1254 | seq_printf(seq, "v%d\n", data->abi); | |
5ac8c355 JJ |
1255 | |
1256 | return 0; | |
1257 | } | |
1258 | ||
5d5182ca | 1259 | static int seq_rawdata_revision_show(struct seq_file *seq, void *v) |
5ac8c355 | 1260 | { |
5d5182ca | 1261 | struct aa_loaddata *data = seq->private; |
5ac8c355 | 1262 | |
5d5182ca JJ |
1263 | seq_printf(seq, "%ld\n", data->revision); |
1264 | ||
1265 | return 0; | |
1266 | } | |
5ac8c355 | 1267 | |
5d5182ca | 1268 | static int seq_rawdata_hash_show(struct seq_file *seq, void *v) |
5ac8c355 | 1269 | { |
5d5182ca | 1270 | struct aa_loaddata *data = seq->private; |
5ac8c355 JJ |
1271 | unsigned int i, size = aa_hash_size(); |
1272 | ||
5d5182ca | 1273 | if (data->hash) { |
5ac8c355 | 1274 | for (i = 0; i < size; i++) |
5d5182ca | 1275 | seq_printf(seq, "%.2x", data->hash[i]); |
47dbd1cd | 1276 | seq_putc(seq, '\n'); |
5ac8c355 | 1277 | } |
5ac8c355 JJ |
1278 | |
1279 | return 0; | |
1280 | } | |
1281 | ||
5d5182ca JJ |
1282 | SEQ_RAWDATA_FOPS(abi); |
1283 | SEQ_RAWDATA_FOPS(revision); | |
1284 | SEQ_RAWDATA_FOPS(hash); | |
5ac8c355 JJ |
1285 | |
1286 | static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size, | |
1287 | loff_t *ppos) | |
1288 | { | |
1289 | struct aa_loaddata *rawdata = file->private_data; | |
1290 | ||
1291 | return simple_read_from_buffer(buf, size, ppos, rawdata->data, | |
1292 | rawdata->size); | |
1293 | } | |
1294 | ||
5d5182ca | 1295 | static int rawdata_release(struct inode *inode, struct file *file) |
5ac8c355 | 1296 | { |
5d5182ca JJ |
1297 | aa_put_loaddata(file->private_data); |
1298 | ||
1299 | return 0; | |
1300 | } | |
5ac8c355 | 1301 | |
5d5182ca JJ |
1302 | static int rawdata_open(struct inode *inode, struct file *file) |
1303 | { | |
5ac8c355 JJ |
1304 | if (!policy_view_capable(NULL)) |
1305 | return -EACCES; | |
5d5182ca JJ |
1306 | file->private_data = __aa_get_loaddata(inode->i_private); |
1307 | if (!file->private_data) | |
1308 | /* lost race: this entry is being reaped */ | |
1309 | return -ENOENT; | |
5ac8c355 JJ |
1310 | |
1311 | return 0; | |
1312 | } | |
1313 | ||
5d5182ca | 1314 | static const struct file_operations rawdata_fops = { |
5ac8c355 JJ |
1315 | .open = rawdata_open, |
1316 | .read = rawdata_read, | |
1317 | .llseek = generic_file_llseek, | |
1318 | .release = rawdata_release, | |
1319 | }; | |
1320 | ||
5d5182ca JJ |
1321 | static void remove_rawdata_dents(struct aa_loaddata *rawdata) |
1322 | { | |
1323 | int i; | |
1324 | ||
1325 | for (i = 0; i < AAFS_LOADDATA_NDENTS; i++) { | |
1326 | if (!IS_ERR_OR_NULL(rawdata->dents[i])) { | |
1327 | /* no refcounts on i_private */ | |
c961ee5f | 1328 | aafs_remove(rawdata->dents[i]); |
5d5182ca JJ |
1329 | rawdata->dents[i] = NULL; |
1330 | } | |
1331 | } | |
1332 | } | |
1333 | ||
1334 | void __aa_fs_remove_rawdata(struct aa_loaddata *rawdata) | |
1335 | { | |
1336 | AA_BUG(rawdata->ns && !mutex_is_locked(&rawdata->ns->lock)); | |
1337 | ||
1338 | if (rawdata->ns) { | |
1339 | remove_rawdata_dents(rawdata); | |
1340 | list_del_init(&rawdata->list); | |
1341 | aa_put_ns(rawdata->ns); | |
1342 | rawdata->ns = NULL; | |
1343 | } | |
1344 | } | |
1345 | ||
1346 | int __aa_fs_create_rawdata(struct aa_ns *ns, struct aa_loaddata *rawdata) | |
1347 | { | |
1348 | struct dentry *dent, *dir; | |
1349 | ||
1350 | AA_BUG(!ns); | |
1351 | AA_BUG(!rawdata); | |
1352 | AA_BUG(!mutex_is_locked(&ns->lock)); | |
1353 | AA_BUG(!ns_subdata_dir(ns)); | |
1354 | ||
1355 | /* | |
1356 | * just use ns revision dir was originally created at. This is | |
1357 | * under ns->lock and if load is successful revision will be | |
1358 | * bumped and is guaranteed to be unique | |
1359 | */ | |
1360 | rawdata->name = kasprintf(GFP_KERNEL, "%ld", ns->revision); | |
1361 | if (!rawdata->name) | |
1362 | return -ENOMEM; | |
1363 | ||
c961ee5f | 1364 | dir = aafs_create_dir(rawdata->name, ns_subdata_dir(ns)); |
5d5182ca JJ |
1365 | if (IS_ERR(dir)) |
1366 | /* ->name freed when rawdata freed */ | |
1367 | return PTR_ERR(dir); | |
1368 | rawdata->dents[AAFS_LOADDATA_DIR] = dir; | |
1369 | ||
c961ee5f | 1370 | dent = aafs_create_file("abi", S_IFREG | 0444, dir, rawdata, |
5d5182ca JJ |
1371 | &seq_rawdata_abi_fops); |
1372 | if (IS_ERR(dent)) | |
1373 | goto fail; | |
1374 | rawdata->dents[AAFS_LOADDATA_ABI] = dent; | |
1375 | ||
c961ee5f | 1376 | dent = aafs_create_file("revision", S_IFREG | 0444, dir, rawdata, |
5d5182ca JJ |
1377 | &seq_rawdata_revision_fops); |
1378 | if (IS_ERR(dent)) | |
1379 | goto fail; | |
1380 | rawdata->dents[AAFS_LOADDATA_REVISION] = dent; | |
1381 | ||
1382 | if (aa_g_hash_policy) { | |
c961ee5f | 1383 | dent = aafs_create_file("sha1", S_IFREG | 0444, dir, |
5d5182ca JJ |
1384 | rawdata, &seq_rawdata_hash_fops); |
1385 | if (IS_ERR(dent)) | |
1386 | goto fail; | |
1387 | rawdata->dents[AAFS_LOADDATA_HASH] = dent; | |
1388 | } | |
1389 | ||
c961ee5f | 1390 | dent = aafs_create_file("raw_data", S_IFREG | 0444, |
5d5182ca JJ |
1391 | dir, rawdata, &rawdata_fops); |
1392 | if (IS_ERR(dent)) | |
1393 | goto fail; | |
1394 | rawdata->dents[AAFS_LOADDATA_DATA] = dent; | |
1395 | d_inode(dent)->i_size = rawdata->size; | |
1396 | ||
1397 | rawdata->ns = aa_get_ns(ns); | |
1398 | list_add(&rawdata->list, &ns->rawdata_list); | |
1399 | /* no refcount on inode rawdata */ | |
1400 | ||
1401 | return 0; | |
1402 | ||
1403 | fail: | |
1404 | remove_rawdata_dents(rawdata); | |
1405 | ||
1406 | return PTR_ERR(dent); | |
1407 | } | |
1408 | ||
0d259f04 | 1409 | /** fns to setup dynamic per profile/namespace files **/ |
c97204ba JJ |
1410 | |
1411 | /** | |
1412 | * | |
1413 | * Requires: @profile->ns->lock held | |
1414 | */ | |
1415 | void __aafs_profile_rmdir(struct aa_profile *profile) | |
0d259f04 JJ |
1416 | { |
1417 | struct aa_profile *child; | |
1418 | int i; | |
1419 | ||
1420 | if (!profile) | |
1421 | return; | |
1422 | ||
1423 | list_for_each_entry(child, &profile->base.profiles, base.list) | |
c97204ba | 1424 | __aafs_profile_rmdir(child); |
0d259f04 JJ |
1425 | |
1426 | for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) { | |
8399588a | 1427 | struct aa_proxy *proxy; |
0d259f04 JJ |
1428 | if (!profile->dents[i]) |
1429 | continue; | |
1430 | ||
8399588a | 1431 | proxy = d_inode(profile->dents[i])->i_private; |
c961ee5f | 1432 | aafs_remove(profile->dents[i]); |
8399588a | 1433 | aa_put_proxy(proxy); |
0d259f04 JJ |
1434 | profile->dents[i] = NULL; |
1435 | } | |
1436 | } | |
1437 | ||
c97204ba JJ |
1438 | /** |
1439 | * | |
1440 | * Requires: @old->ns->lock held | |
1441 | */ | |
1442 | void __aafs_profile_migrate_dents(struct aa_profile *old, | |
1443 | struct aa_profile *new) | |
0d259f04 JJ |
1444 | { |
1445 | int i; | |
1446 | ||
37e2a995 JJ |
1447 | AA_BUG(!old); |
1448 | AA_BUG(!new); | |
1449 | AA_BUG(!mutex_is_locked(&profiles_ns(old)->lock)); | |
1450 | ||
0d259f04 JJ |
1451 | for (i = 0; i < AAFS_PROF_SIZEOF; i++) { |
1452 | new->dents[i] = old->dents[i]; | |
d671e890 | 1453 | if (new->dents[i]) |
078cd827 | 1454 | new->dents[i]->d_inode->i_mtime = current_time(new->dents[i]->d_inode); |
0d259f04 JJ |
1455 | old->dents[i] = NULL; |
1456 | } | |
1457 | } | |
1458 | ||
1459 | static struct dentry *create_profile_file(struct dentry *dir, const char *name, | |
1460 | struct aa_profile *profile, | |
1461 | const struct file_operations *fops) | |
1462 | { | |
637f688d | 1463 | struct aa_proxy *proxy = aa_get_proxy(profile->label.proxy); |
0d259f04 JJ |
1464 | struct dentry *dent; |
1465 | ||
c961ee5f | 1466 | dent = aafs_create_file(name, S_IFREG | 0444, dir, proxy, fops); |
0d259f04 | 1467 | if (IS_ERR(dent)) |
8399588a | 1468 | aa_put_proxy(proxy); |
0d259f04 JJ |
1469 | |
1470 | return dent; | |
1471 | } | |
1472 | ||
5d5182ca JJ |
1473 | static int profile_depth(struct aa_profile *profile) |
1474 | { | |
1475 | int depth = 0; | |
1476 | ||
1477 | rcu_read_lock(); | |
1478 | for (depth = 0; profile; profile = rcu_access_pointer(profile->parent)) | |
1479 | depth++; | |
1480 | rcu_read_unlock(); | |
1481 | ||
1482 | return depth; | |
1483 | } | |
1484 | ||
1485 | static int gen_symlink_name(char *buffer, size_t bsize, int depth, | |
1486 | const char *dirname, const char *fname) | |
1487 | { | |
1488 | int error; | |
1489 | ||
1490 | for (; depth > 0; depth--) { | |
1491 | if (bsize < 7) | |
1492 | return -ENAMETOOLONG; | |
1493 | strcpy(buffer, "../../"); | |
1494 | buffer += 6; | |
1495 | bsize -= 6; | |
1496 | } | |
1497 | ||
1498 | error = snprintf(buffer, bsize, "raw_data/%s/%s", dirname, fname); | |
1499 | if (error >= bsize || error < 0) | |
1500 | return -ENAMETOOLONG; | |
1501 | ||
1502 | return 0; | |
1503 | } | |
1504 | ||
1505 | /* | |
1506 | * Requires: @profile->ns->lock held | |
1507 | */ | |
c97204ba | 1508 | int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent) |
0d259f04 JJ |
1509 | { |
1510 | struct aa_profile *child; | |
1511 | struct dentry *dent = NULL, *dir; | |
1512 | int error; | |
1513 | ||
37e2a995 JJ |
1514 | AA_BUG(!profile); |
1515 | AA_BUG(!mutex_is_locked(&profiles_ns(profile)->lock)); | |
1516 | ||
0d259f04 JJ |
1517 | if (!parent) { |
1518 | struct aa_profile *p; | |
1519 | p = aa_deref_parent(profile); | |
1520 | dent = prof_dir(p); | |
1521 | /* adding to parent that previously didn't have children */ | |
c961ee5f | 1522 | dent = aafs_create_dir("profiles", dent); |
0d259f04 JJ |
1523 | if (IS_ERR(dent)) |
1524 | goto fail; | |
1525 | prof_child_dir(p) = parent = dent; | |
1526 | } | |
1527 | ||
1528 | if (!profile->dirname) { | |
1529 | int len, id_len; | |
1530 | len = mangle_name(profile->base.name, NULL); | |
1531 | id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id); | |
1532 | ||
1533 | profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL); | |
ffac1de6 DC |
1534 | if (!profile->dirname) { |
1535 | error = -ENOMEM; | |
1536 | goto fail2; | |
1537 | } | |
0d259f04 JJ |
1538 | |
1539 | mangle_name(profile->base.name, profile->dirname); | |
1540 | sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++); | |
1541 | } | |
1542 | ||
c961ee5f | 1543 | dent = aafs_create_dir(profile->dirname, parent); |
0d259f04 JJ |
1544 | if (IS_ERR(dent)) |
1545 | goto fail; | |
1546 | prof_dir(profile) = dir = dent; | |
1547 | ||
52b97de3 JJ |
1548 | dent = create_profile_file(dir, "name", profile, |
1549 | &seq_profile_name_fops); | |
0d259f04 JJ |
1550 | if (IS_ERR(dent)) |
1551 | goto fail; | |
1552 | profile->dents[AAFS_PROF_NAME] = dent; | |
1553 | ||
52b97de3 JJ |
1554 | dent = create_profile_file(dir, "mode", profile, |
1555 | &seq_profile_mode_fops); | |
0d259f04 JJ |
1556 | if (IS_ERR(dent)) |
1557 | goto fail; | |
1558 | profile->dents[AAFS_PROF_MODE] = dent; | |
1559 | ||
556d0be7 | 1560 | dent = create_profile_file(dir, "attach", profile, |
52b97de3 | 1561 | &seq_profile_attach_fops); |
556d0be7 JJ |
1562 | if (IS_ERR(dent)) |
1563 | goto fail; | |
1564 | profile->dents[AAFS_PROF_ATTACH] = dent; | |
1565 | ||
f8eb8a13 JJ |
1566 | if (profile->hash) { |
1567 | dent = create_profile_file(dir, "sha1", profile, | |
52b97de3 | 1568 | &seq_profile_hash_fops); |
f8eb8a13 JJ |
1569 | if (IS_ERR(dent)) |
1570 | goto fail; | |
1571 | profile->dents[AAFS_PROF_HASH] = dent; | |
1572 | } | |
1573 | ||
5ac8c355 | 1574 | if (profile->rawdata) { |
5d5182ca JJ |
1575 | char target[64]; |
1576 | int depth = profile_depth(profile); | |
1577 | ||
1578 | error = gen_symlink_name(target, sizeof(target), depth, | |
1579 | profile->rawdata->name, "sha1"); | |
1580 | if (error < 0) | |
1581 | goto fail2; | |
c961ee5f | 1582 | dent = aafs_create_symlink("raw_sha1", dir, target, NULL); |
5ac8c355 JJ |
1583 | if (IS_ERR(dent)) |
1584 | goto fail; | |
1585 | profile->dents[AAFS_PROF_RAW_HASH] = dent; | |
1586 | ||
5d5182ca JJ |
1587 | error = gen_symlink_name(target, sizeof(target), depth, |
1588 | profile->rawdata->name, "abi"); | |
1589 | if (error < 0) | |
1590 | goto fail2; | |
c961ee5f | 1591 | dent = aafs_create_symlink("raw_abi", dir, target, NULL); |
5ac8c355 JJ |
1592 | if (IS_ERR(dent)) |
1593 | goto fail; | |
1594 | profile->dents[AAFS_PROF_RAW_ABI] = dent; | |
1595 | ||
5d5182ca JJ |
1596 | error = gen_symlink_name(target, sizeof(target), depth, |
1597 | profile->rawdata->name, "raw_data"); | |
1598 | if (error < 0) | |
1599 | goto fail2; | |
c961ee5f | 1600 | dent = aafs_create_symlink("raw_data", dir, target, NULL); |
5ac8c355 JJ |
1601 | if (IS_ERR(dent)) |
1602 | goto fail; | |
1603 | profile->dents[AAFS_PROF_RAW_DATA] = dent; | |
5ac8c355 JJ |
1604 | } |
1605 | ||
0d259f04 | 1606 | list_for_each_entry(child, &profile->base.profiles, base.list) { |
c97204ba | 1607 | error = __aafs_profile_mkdir(child, prof_child_dir(profile)); |
0d259f04 JJ |
1608 | if (error) |
1609 | goto fail2; | |
1610 | } | |
1611 | ||
1612 | return 0; | |
1613 | ||
1614 | fail: | |
1615 | error = PTR_ERR(dent); | |
1616 | ||
1617 | fail2: | |
c97204ba | 1618 | __aafs_profile_rmdir(profile); |
0d259f04 JJ |
1619 | |
1620 | return error; | |
1621 | } | |
1622 | ||
4ae47f33 JJ |
1623 | static int ns_mkdir_op(struct inode *dir, struct dentry *dentry, umode_t mode) |
1624 | { | |
1625 | struct aa_ns *ns, *parent; | |
1626 | /* TODO: improve permission check */ | |
637f688d JJ |
1627 | struct aa_label *label; |
1628 | int error; | |
1629 | ||
1630 | label = begin_current_label_crit_section(); | |
1631 | error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY); | |
1632 | end_current_label_crit_section(label); | |
4ae47f33 JJ |
1633 | if (error) |
1634 | return error; | |
1635 | ||
1636 | parent = aa_get_ns(dir->i_private); | |
1637 | AA_BUG(d_inode(ns_subns_dir(parent)) != dir); | |
1638 | ||
1639 | /* we have to unlock and then relock to get locking order right | |
1640 | * for pin_fs | |
1641 | */ | |
1642 | inode_unlock(dir); | |
1643 | error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count); | |
1644 | mutex_lock(&parent->lock); | |
1645 | inode_lock_nested(dir, I_MUTEX_PARENT); | |
1646 | if (error) | |
1647 | goto out; | |
1648 | ||
1649 | error = __aafs_setup_d_inode(dir, dentry, mode | S_IFDIR, NULL, | |
1650 | NULL, NULL, NULL); | |
1651 | if (error) | |
1652 | goto out_pin; | |
1653 | ||
1654 | ns = __aa_find_or_create_ns(parent, READ_ONCE(dentry->d_name.name), | |
1655 | dentry); | |
1656 | if (IS_ERR(ns)) { | |
1657 | error = PTR_ERR(ns); | |
1658 | ns = NULL; | |
1659 | } | |
1660 | ||
1661 | aa_put_ns(ns); /* list ref remains */ | |
1662 | out_pin: | |
1663 | if (error) | |
1664 | simple_release_fs(&aafs_mnt, &aafs_count); | |
1665 | out: | |
1666 | mutex_unlock(&parent->lock); | |
1667 | aa_put_ns(parent); | |
1668 | ||
1669 | return error; | |
1670 | } | |
1671 | ||
1672 | static int ns_rmdir_op(struct inode *dir, struct dentry *dentry) | |
1673 | { | |
1674 | struct aa_ns *ns, *parent; | |
1675 | /* TODO: improve permission check */ | |
637f688d JJ |
1676 | struct aa_label *label; |
1677 | int error; | |
1678 | ||
1679 | label = begin_current_label_crit_section(); | |
1680 | error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY); | |
1681 | end_current_label_crit_section(label); | |
4ae47f33 JJ |
1682 | if (error) |
1683 | return error; | |
1684 | ||
637f688d | 1685 | parent = aa_get_ns(dir->i_private); |
4ae47f33 JJ |
1686 | /* rmdir calls the generic securityfs functions to remove files |
1687 | * from the apparmor dir. It is up to the apparmor ns locking | |
1688 | * to avoid races. | |
1689 | */ | |
1690 | inode_unlock(dir); | |
1691 | inode_unlock(dentry->d_inode); | |
1692 | ||
1693 | mutex_lock(&parent->lock); | |
1694 | ns = aa_get_ns(__aa_findn_ns(&parent->sub_ns, dentry->d_name.name, | |
1695 | dentry->d_name.len)); | |
1696 | if (!ns) { | |
1697 | error = -ENOENT; | |
1698 | goto out; | |
1699 | } | |
1700 | AA_BUG(ns_dir(ns) != dentry); | |
1701 | ||
1702 | __aa_remove_ns(ns); | |
1703 | aa_put_ns(ns); | |
1704 | ||
1705 | out: | |
1706 | mutex_unlock(&parent->lock); | |
1707 | inode_lock_nested(dir, I_MUTEX_PARENT); | |
1708 | inode_lock(dentry->d_inode); | |
1709 | aa_put_ns(parent); | |
1710 | ||
1711 | return error; | |
1712 | } | |
1713 | ||
1714 | static const struct inode_operations ns_dir_inode_operations = { | |
1715 | .lookup = simple_lookup, | |
1716 | .mkdir = ns_mkdir_op, | |
1717 | .rmdir = ns_rmdir_op, | |
1718 | }; | |
1719 | ||
5d5182ca JJ |
1720 | static void __aa_fs_list_remove_rawdata(struct aa_ns *ns) |
1721 | { | |
1722 | struct aa_loaddata *ent, *tmp; | |
1723 | ||
1724 | AA_BUG(!mutex_is_locked(&ns->lock)); | |
1725 | ||
1726 | list_for_each_entry_safe(ent, tmp, &ns->rawdata_list, list) | |
1727 | __aa_fs_remove_rawdata(ent); | |
1728 | } | |
1729 | ||
c97204ba JJ |
1730 | /** |
1731 | * | |
1732 | * Requires: @ns->lock held | |
1733 | */ | |
1734 | void __aafs_ns_rmdir(struct aa_ns *ns) | |
0d259f04 | 1735 | { |
98849dff | 1736 | struct aa_ns *sub; |
0d259f04 JJ |
1737 | struct aa_profile *child; |
1738 | int i; | |
1739 | ||
1740 | if (!ns) | |
1741 | return; | |
37e2a995 | 1742 | AA_BUG(!mutex_is_locked(&ns->lock)); |
0d259f04 JJ |
1743 | |
1744 | list_for_each_entry(child, &ns->base.profiles, base.list) | |
c97204ba | 1745 | __aafs_profile_rmdir(child); |
0d259f04 JJ |
1746 | |
1747 | list_for_each_entry(sub, &ns->sub_ns, base.list) { | |
1748 | mutex_lock(&sub->lock); | |
c97204ba | 1749 | __aafs_ns_rmdir(sub); |
0d259f04 JJ |
1750 | mutex_unlock(&sub->lock); |
1751 | } | |
1752 | ||
5d5182ca JJ |
1753 | __aa_fs_list_remove_rawdata(ns); |
1754 | ||
b7fd2c03 JJ |
1755 | if (ns_subns_dir(ns)) { |
1756 | sub = d_inode(ns_subns_dir(ns))->i_private; | |
1757 | aa_put_ns(sub); | |
1758 | } | |
1759 | if (ns_subload(ns)) { | |
1760 | sub = d_inode(ns_subload(ns))->i_private; | |
1761 | aa_put_ns(sub); | |
1762 | } | |
1763 | if (ns_subreplace(ns)) { | |
1764 | sub = d_inode(ns_subreplace(ns))->i_private; | |
1765 | aa_put_ns(sub); | |
1766 | } | |
1767 | if (ns_subremove(ns)) { | |
1768 | sub = d_inode(ns_subremove(ns))->i_private; | |
1769 | aa_put_ns(sub); | |
1770 | } | |
d9bf2c26 JJ |
1771 | if (ns_subrevision(ns)) { |
1772 | sub = d_inode(ns_subrevision(ns))->i_private; | |
1773 | aa_put_ns(sub); | |
1774 | } | |
b7fd2c03 | 1775 | |
0d259f04 | 1776 | for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) { |
c961ee5f | 1777 | aafs_remove(ns->dents[i]); |
0d259f04 JJ |
1778 | ns->dents[i] = NULL; |
1779 | } | |
1780 | } | |
1781 | ||
b7fd2c03 | 1782 | /* assumes cleanup in caller */ |
c97204ba | 1783 | static int __aafs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir) |
b7fd2c03 JJ |
1784 | { |
1785 | struct dentry *dent; | |
1786 | ||
1787 | AA_BUG(!ns); | |
1788 | AA_BUG(!dir); | |
1789 | ||
c961ee5f | 1790 | dent = aafs_create_dir("profiles", dir); |
b7fd2c03 JJ |
1791 | if (IS_ERR(dent)) |
1792 | return PTR_ERR(dent); | |
1793 | ns_subprofs_dir(ns) = dent; | |
1794 | ||
c961ee5f | 1795 | dent = aafs_create_dir("raw_data", dir); |
b7fd2c03 JJ |
1796 | if (IS_ERR(dent)) |
1797 | return PTR_ERR(dent); | |
1798 | ns_subdata_dir(ns) = dent; | |
1799 | ||
d9bf2c26 JJ |
1800 | dent = aafs_create_file("revision", 0444, dir, ns, |
1801 | &aa_fs_ns_revision_fops); | |
1802 | if (IS_ERR(dent)) | |
1803 | return PTR_ERR(dent); | |
1804 | aa_get_ns(ns); | |
1805 | ns_subrevision(ns) = dent; | |
1806 | ||
c961ee5f | 1807 | dent = aafs_create_file(".load", 0640, dir, ns, |
b7fd2c03 JJ |
1808 | &aa_fs_profile_load); |
1809 | if (IS_ERR(dent)) | |
1810 | return PTR_ERR(dent); | |
1811 | aa_get_ns(ns); | |
1812 | ns_subload(ns) = dent; | |
1813 | ||
c961ee5f | 1814 | dent = aafs_create_file(".replace", 0640, dir, ns, |
b7fd2c03 JJ |
1815 | &aa_fs_profile_replace); |
1816 | if (IS_ERR(dent)) | |
1817 | return PTR_ERR(dent); | |
1818 | aa_get_ns(ns); | |
1819 | ns_subreplace(ns) = dent; | |
1820 | ||
c961ee5f | 1821 | dent = aafs_create_file(".remove", 0640, dir, ns, |
b7fd2c03 JJ |
1822 | &aa_fs_profile_remove); |
1823 | if (IS_ERR(dent)) | |
1824 | return PTR_ERR(dent); | |
1825 | aa_get_ns(ns); | |
1826 | ns_subremove(ns) = dent; | |
1827 | ||
4ae47f33 JJ |
1828 | /* use create_dentry so we can supply private data */ |
1829 | dent = aafs_create("namespaces", S_IFDIR | 0755, dir, ns, NULL, NULL, | |
1830 | &ns_dir_inode_operations); | |
b7fd2c03 JJ |
1831 | if (IS_ERR(dent)) |
1832 | return PTR_ERR(dent); | |
1833 | aa_get_ns(ns); | |
1834 | ns_subns_dir(ns) = dent; | |
1835 | ||
1836 | return 0; | |
1837 | } | |
1838 | ||
c97204ba JJ |
1839 | /* |
1840 | * Requires: @ns->lock held | |
1841 | */ | |
98407f0a JJ |
1842 | int __aafs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name, |
1843 | struct dentry *dent) | |
0d259f04 | 1844 | { |
98849dff | 1845 | struct aa_ns *sub; |
0d259f04 | 1846 | struct aa_profile *child; |
98407f0a | 1847 | struct dentry *dir; |
0d259f04 JJ |
1848 | int error; |
1849 | ||
b7fd2c03 JJ |
1850 | AA_BUG(!ns); |
1851 | AA_BUG(!parent); | |
1852 | AA_BUG(!mutex_is_locked(&ns->lock)); | |
1853 | ||
0d259f04 JJ |
1854 | if (!name) |
1855 | name = ns->base.name; | |
1856 | ||
c961ee5f JJ |
1857 | if (!dent) { |
1858 | /* create ns dir if it doesn't already exist */ | |
1859 | dent = aafs_create_dir(name, parent); | |
1860 | if (IS_ERR(dent)) | |
1861 | goto fail; | |
1862 | } else | |
1863 | dget(dent); | |
b7fd2c03 | 1864 | ns_dir(ns) = dir = dent; |
c97204ba | 1865 | error = __aafs_ns_mkdir_entries(ns, dir); |
b7fd2c03 JJ |
1866 | if (error) |
1867 | goto fail2; | |
0d259f04 | 1868 | |
b7fd2c03 | 1869 | /* profiles */ |
0d259f04 | 1870 | list_for_each_entry(child, &ns->base.profiles, base.list) { |
c97204ba | 1871 | error = __aafs_profile_mkdir(child, ns_subprofs_dir(ns)); |
0d259f04 JJ |
1872 | if (error) |
1873 | goto fail2; | |
1874 | } | |
1875 | ||
b7fd2c03 | 1876 | /* subnamespaces */ |
0d259f04 JJ |
1877 | list_for_each_entry(sub, &ns->sub_ns, base.list) { |
1878 | mutex_lock(&sub->lock); | |
98407f0a | 1879 | error = __aafs_ns_mkdir(sub, ns_subns_dir(ns), NULL, NULL); |
0d259f04 JJ |
1880 | mutex_unlock(&sub->lock); |
1881 | if (error) | |
1882 | goto fail2; | |
1883 | } | |
1884 | ||
1885 | return 0; | |
1886 | ||
1887 | fail: | |
1888 | error = PTR_ERR(dent); | |
1889 | ||
1890 | fail2: | |
c97204ba | 1891 | __aafs_ns_rmdir(ns); |
0d259f04 JJ |
1892 | |
1893 | return error; | |
1894 | } | |
1895 | ||
1896 | ||
29b3822f JJ |
1897 | #define list_entry_is_head(pos, head, member) (&pos->member == (head)) |
1898 | ||
1899 | /** | |
98849dff | 1900 | * __next_ns - find the next namespace to list |
29b3822f JJ |
1901 | * @root: root namespace to stop search at (NOT NULL) |
1902 | * @ns: current ns position (NOT NULL) | |
1903 | * | |
1904 | * Find the next namespace from @ns under @root and handle all locking needed | |
1905 | * while switching current namespace. | |
1906 | * | |
1907 | * Returns: next namespace or NULL if at last namespace under @root | |
1908 | * Requires: ns->parent->lock to be held | |
1909 | * NOTE: will not unlock root->lock | |
1910 | */ | |
98849dff | 1911 | static struct aa_ns *__next_ns(struct aa_ns *root, struct aa_ns *ns) |
29b3822f | 1912 | { |
98849dff | 1913 | struct aa_ns *parent, *next; |
29b3822f | 1914 | |
37e2a995 JJ |
1915 | AA_BUG(!root); |
1916 | AA_BUG(!ns); | |
1917 | AA_BUG(ns != root && !mutex_is_locked(&ns->parent->lock)); | |
1918 | ||
29b3822f JJ |
1919 | /* is next namespace a child */ |
1920 | if (!list_empty(&ns->sub_ns)) { | |
1921 | next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list); | |
1922 | mutex_lock(&next->lock); | |
1923 | return next; | |
1924 | } | |
1925 | ||
1926 | /* check if the next ns is a sibling, parent, gp, .. */ | |
1927 | parent = ns->parent; | |
ed2c7da3 | 1928 | while (ns != root) { |
29b3822f | 1929 | mutex_unlock(&ns->lock); |
38dbd7d8 | 1930 | next = list_next_entry(ns, base.list); |
29b3822f JJ |
1931 | if (!list_entry_is_head(next, &parent->sub_ns, base.list)) { |
1932 | mutex_lock(&next->lock); | |
1933 | return next; | |
1934 | } | |
29b3822f JJ |
1935 | ns = parent; |
1936 | parent = parent->parent; | |
1937 | } | |
1938 | ||
1939 | return NULL; | |
1940 | } | |
1941 | ||
1942 | /** | |
1943 | * __first_profile - find the first profile in a namespace | |
1944 | * @root: namespace that is root of profiles being displayed (NOT NULL) | |
1945 | * @ns: namespace to start in (NOT NULL) | |
1946 | * | |
1947 | * Returns: unrefcounted profile or NULL if no profile | |
1948 | * Requires: profile->ns.lock to be held | |
1949 | */ | |
98849dff JJ |
1950 | static struct aa_profile *__first_profile(struct aa_ns *root, |
1951 | struct aa_ns *ns) | |
29b3822f | 1952 | { |
37e2a995 JJ |
1953 | AA_BUG(!root); |
1954 | AA_BUG(ns && !mutex_is_locked(&ns->lock)); | |
1955 | ||
98849dff | 1956 | for (; ns; ns = __next_ns(root, ns)) { |
29b3822f JJ |
1957 | if (!list_empty(&ns->base.profiles)) |
1958 | return list_first_entry(&ns->base.profiles, | |
1959 | struct aa_profile, base.list); | |
1960 | } | |
1961 | return NULL; | |
1962 | } | |
1963 | ||
1964 | /** | |
1965 | * __next_profile - step to the next profile in a profile tree | |
1966 | * @profile: current profile in tree (NOT NULL) | |
1967 | * | |
1968 | * Perform a depth first traversal on the profile tree in a namespace | |
1969 | * | |
1970 | * Returns: next profile or NULL if done | |
1971 | * Requires: profile->ns.lock to be held | |
1972 | */ | |
1973 | static struct aa_profile *__next_profile(struct aa_profile *p) | |
1974 | { | |
1975 | struct aa_profile *parent; | |
98849dff | 1976 | struct aa_ns *ns = p->ns; |
29b3822f | 1977 | |
37e2a995 JJ |
1978 | AA_BUG(!mutex_is_locked(&profiles_ns(p)->lock)); |
1979 | ||
29b3822f JJ |
1980 | /* is next profile a child */ |
1981 | if (!list_empty(&p->base.profiles)) | |
1982 | return list_first_entry(&p->base.profiles, typeof(*p), | |
1983 | base.list); | |
1984 | ||
1985 | /* is next profile a sibling, parent sibling, gp, sibling, .. */ | |
1986 | parent = rcu_dereference_protected(p->parent, | |
1987 | mutex_is_locked(&p->ns->lock)); | |
1988 | while (parent) { | |
38dbd7d8 | 1989 | p = list_next_entry(p, base.list); |
29b3822f JJ |
1990 | if (!list_entry_is_head(p, &parent->base.profiles, base.list)) |
1991 | return p; | |
1992 | p = parent; | |
1993 | parent = rcu_dereference_protected(parent->parent, | |
1994 | mutex_is_locked(&parent->ns->lock)); | |
1995 | } | |
1996 | ||
1997 | /* is next another profile in the namespace */ | |
38dbd7d8 | 1998 | p = list_next_entry(p, base.list); |
29b3822f JJ |
1999 | if (!list_entry_is_head(p, &ns->base.profiles, base.list)) |
2000 | return p; | |
2001 | ||
2002 | return NULL; | |
2003 | } | |
2004 | ||
2005 | /** | |
2006 | * next_profile - step to the next profile in where ever it may be | |
2007 | * @root: root namespace (NOT NULL) | |
2008 | * @profile: current profile (NOT NULL) | |
2009 | * | |
2010 | * Returns: next profile or NULL if there isn't one | |
2011 | */ | |
98849dff | 2012 | static struct aa_profile *next_profile(struct aa_ns *root, |
29b3822f JJ |
2013 | struct aa_profile *profile) |
2014 | { | |
2015 | struct aa_profile *next = __next_profile(profile); | |
2016 | if (next) | |
2017 | return next; | |
2018 | ||
2019 | /* finished all profiles in namespace move to next namespace */ | |
98849dff | 2020 | return __first_profile(root, __next_ns(root, profile->ns)); |
29b3822f JJ |
2021 | } |
2022 | ||
2023 | /** | |
2024 | * p_start - start a depth first traversal of profile tree | |
2025 | * @f: seq_file to fill | |
2026 | * @pos: current position | |
2027 | * | |
2028 | * Returns: first profile under current namespace or NULL if none found | |
2029 | * | |
2030 | * acquires first ns->lock | |
2031 | */ | |
2032 | static void *p_start(struct seq_file *f, loff_t *pos) | |
2033 | { | |
2034 | struct aa_profile *profile = NULL; | |
cf797c0e | 2035 | struct aa_ns *root = aa_get_current_ns(); |
29b3822f | 2036 | loff_t l = *pos; |
cf797c0e | 2037 | f->private = root; |
29b3822f JJ |
2038 | |
2039 | /* find the first profile */ | |
2040 | mutex_lock(&root->lock); | |
2041 | profile = __first_profile(root, root); | |
2042 | ||
2043 | /* skip to position */ | |
2044 | for (; profile && l > 0; l--) | |
2045 | profile = next_profile(root, profile); | |
2046 | ||
2047 | return profile; | |
2048 | } | |
2049 | ||
2050 | /** | |
2051 | * p_next - read the next profile entry | |
2052 | * @f: seq_file to fill | |
2053 | * @p: profile previously returned | |
2054 | * @pos: current position | |
2055 | * | |
2056 | * Returns: next profile after @p or NULL if none | |
2057 | * | |
2058 | * may acquire/release locks in namespace tree as necessary | |
2059 | */ | |
2060 | static void *p_next(struct seq_file *f, void *p, loff_t *pos) | |
2061 | { | |
2062 | struct aa_profile *profile = p; | |
98849dff | 2063 | struct aa_ns *ns = f->private; |
29b3822f JJ |
2064 | (*pos)++; |
2065 | ||
2066 | return next_profile(ns, profile); | |
2067 | } | |
2068 | ||
2069 | /** | |
2070 | * p_stop - stop depth first traversal | |
2071 | * @f: seq_file we are filling | |
2072 | * @p: the last profile writen | |
2073 | * | |
2074 | * Release all locking done by p_start/p_next on namespace tree | |
2075 | */ | |
2076 | static void p_stop(struct seq_file *f, void *p) | |
2077 | { | |
2078 | struct aa_profile *profile = p; | |
98849dff | 2079 | struct aa_ns *root = f->private, *ns; |
29b3822f JJ |
2080 | |
2081 | if (profile) { | |
2082 | for (ns = profile->ns; ns && ns != root; ns = ns->parent) | |
2083 | mutex_unlock(&ns->lock); | |
2084 | } | |
2085 | mutex_unlock(&root->lock); | |
98849dff | 2086 | aa_put_ns(root); |
29b3822f JJ |
2087 | } |
2088 | ||
2089 | /** | |
2090 | * seq_show_profile - show a profile entry | |
2091 | * @f: seq_file to file | |
2092 | * @p: current position (profile) (NOT NULL) | |
2093 | * | |
2094 | * Returns: error on failure | |
2095 | */ | |
2096 | static int seq_show_profile(struct seq_file *f, void *p) | |
2097 | { | |
2098 | struct aa_profile *profile = (struct aa_profile *)p; | |
98849dff | 2099 | struct aa_ns *root = f->private; |
29b3822f | 2100 | |
637f688d JJ |
2101 | aa_label_seq_xprint(f, root, &profile->label, |
2102 | FLAG_SHOW_MODE | FLAG_VIEW_SUBNS, GFP_KERNEL); | |
2103 | seq_putc(f, '\n'); | |
29b3822f JJ |
2104 | |
2105 | return 0; | |
2106 | } | |
2107 | ||
c97204ba | 2108 | static const struct seq_operations aa_sfs_profiles_op = { |
29b3822f JJ |
2109 | .start = p_start, |
2110 | .next = p_next, | |
2111 | .stop = p_stop, | |
2112 | .show = seq_show_profile, | |
2113 | }; | |
2114 | ||
2115 | static int profiles_open(struct inode *inode, struct file *file) | |
2116 | { | |
5ac8c355 JJ |
2117 | if (!policy_view_capable(NULL)) |
2118 | return -EACCES; | |
2119 | ||
c97204ba | 2120 | return seq_open(file, &aa_sfs_profiles_op); |
29b3822f JJ |
2121 | } |
2122 | ||
2123 | static int profiles_release(struct inode *inode, struct file *file) | |
2124 | { | |
2125 | return seq_release(inode, file); | |
2126 | } | |
2127 | ||
c97204ba | 2128 | static const struct file_operations aa_sfs_profiles_fops = { |
29b3822f JJ |
2129 | .open = profiles_open, |
2130 | .read = seq_read, | |
2131 | .llseek = seq_lseek, | |
2132 | .release = profiles_release, | |
2133 | }; | |
2134 | ||
2135 | ||
0d259f04 | 2136 | /** Base file system setup **/ |
c97204ba JJ |
2137 | static struct aa_sfs_entry aa_sfs_entry_file[] = { |
2138 | AA_SFS_FILE_STRING("mask", | |
2139 | "create read write exec append mmap_exec link lock"), | |
a9bf8e9f KC |
2140 | { } |
2141 | }; | |
2142 | ||
290f458a JJ |
2143 | static struct aa_sfs_entry aa_sfs_entry_ptrace[] = { |
2144 | AA_SFS_FILE_STRING("mask", "read trace"), | |
2145 | { } | |
2146 | }; | |
2147 | ||
84632f19 JJ |
2148 | static struct aa_sfs_entry aa_sfs_entry_signal[] = { |
2149 | AA_SFS_FILE_STRING("mask", AA_SFS_SIG_MASK), | |
2150 | { } | |
2151 | }; | |
2152 | ||
c97204ba JJ |
2153 | static struct aa_sfs_entry aa_sfs_entry_domain[] = { |
2154 | AA_SFS_FILE_BOOLEAN("change_hat", 1), | |
2155 | AA_SFS_FILE_BOOLEAN("change_hatv", 1), | |
2156 | AA_SFS_FILE_BOOLEAN("change_onexec", 1), | |
2157 | AA_SFS_FILE_BOOLEAN("change_profile", 1), | |
6c5fc8f1 | 2158 | AA_SFS_FILE_BOOLEAN("stack", 1), |
c97204ba JJ |
2159 | AA_SFS_FILE_BOOLEAN("fix_binfmt_elf_mmap", 1), |
2160 | AA_SFS_FILE_STRING("version", "1.2"), | |
e74abcf3 KC |
2161 | { } |
2162 | }; | |
2163 | ||
c97204ba JJ |
2164 | static struct aa_sfs_entry aa_sfs_entry_versions[] = { |
2165 | AA_SFS_FILE_BOOLEAN("v5", 1), | |
5379a331 JJ |
2166 | AA_SFS_FILE_BOOLEAN("v6", 1), |
2167 | AA_SFS_FILE_BOOLEAN("v7", 1), | |
474d6b75 JJ |
2168 | { } |
2169 | }; | |
2170 | ||
c97204ba JJ |
2171 | static struct aa_sfs_entry aa_sfs_entry_policy[] = { |
2172 | AA_SFS_DIR("versions", aa_sfs_entry_versions), | |
2173 | AA_SFS_FILE_BOOLEAN("set_load", 1), | |
474d6b75 | 2174 | { } |
9d910a3b JJ |
2175 | }; |
2176 | ||
21fad8c3 JJ |
2177 | static struct aa_sfs_entry aa_sfs_entry_mount[] = { |
2178 | AA_SFS_FILE_STRING("mask", "mount umount pivot_root"), | |
2179 | { } | |
2180 | }; | |
2181 | ||
33f2eada JJ |
2182 | static struct aa_sfs_entry aa_sfs_entry_ns[] = { |
2183 | AA_SFS_FILE_BOOLEAN("profile", 1), | |
21fad8c3 | 2184 | AA_SFS_FILE_BOOLEAN("pivot_root", 0), |
33f2eada JJ |
2185 | { } |
2186 | }; | |
2187 | ||
fd1cafbb JJ |
2188 | static struct aa_sfs_entry aa_sfs_entry_dbus[] = { |
2189 | AA_SFS_FILE_STRING("mask", "acquire send receive"), | |
2190 | { } | |
2191 | }; | |
2192 | ||
a83bd86e | 2193 | static struct aa_sfs_entry aa_sfs_entry_query_label[] = { |
4f3b3f2d | 2194 | AA_SFS_FILE_STRING("perms", "allow deny audit quiet"), |
a83bd86e | 2195 | AA_SFS_FILE_BOOLEAN("data", 1), |
1dea3b41 | 2196 | AA_SFS_FILE_BOOLEAN("multi_transaction", 1), |
a83bd86e JJ |
2197 | { } |
2198 | }; | |
2199 | ||
2200 | static struct aa_sfs_entry aa_sfs_entry_query[] = { | |
2201 | AA_SFS_DIR("label", aa_sfs_entry_query_label), | |
2202 | { } | |
2203 | }; | |
c97204ba JJ |
2204 | static struct aa_sfs_entry aa_sfs_entry_features[] = { |
2205 | AA_SFS_DIR("policy", aa_sfs_entry_policy), | |
2206 | AA_SFS_DIR("domain", aa_sfs_entry_domain), | |
2207 | AA_SFS_DIR("file", aa_sfs_entry_file), | |
695b0eb9 | 2208 | AA_SFS_DIR("network", aa_sfs_entry_network), |
21fad8c3 | 2209 | AA_SFS_DIR("mount", aa_sfs_entry_mount), |
33f2eada | 2210 | AA_SFS_DIR("namespaces", aa_sfs_entry_ns), |
c97204ba JJ |
2211 | AA_SFS_FILE_U64("capability", VFS_CAP_FLAGS_MASK), |
2212 | AA_SFS_DIR("rlimit", aa_sfs_entry_rlimit), | |
2213 | AA_SFS_DIR("caps", aa_sfs_entry_caps), | |
290f458a | 2214 | AA_SFS_DIR("ptrace", aa_sfs_entry_ptrace), |
84632f19 | 2215 | AA_SFS_DIR("signal", aa_sfs_entry_signal), |
fd1cafbb | 2216 | AA_SFS_DIR("dbus", aa_sfs_entry_dbus), |
a83bd86e | 2217 | AA_SFS_DIR("query", aa_sfs_entry_query), |
e74abcf3 KC |
2218 | { } |
2219 | }; | |
2220 | ||
c97204ba | 2221 | static struct aa_sfs_entry aa_sfs_entry_apparmor[] = { |
8e65199b | 2222 | AA_SFS_FILE_FOPS(".access", 0666, &aa_sfs_access), |
6c5fc8f1 JJ |
2223 | AA_SFS_FILE_FOPS(".stacked", 0444, &seq_ns_stacked_fops), |
2224 | AA_SFS_FILE_FOPS(".ns_stacked", 0444, &seq_ns_nsstacked_fops), | |
8e65199b JJ |
2225 | AA_SFS_FILE_FOPS(".ns_level", 0444, &seq_ns_level_fops), |
2226 | AA_SFS_FILE_FOPS(".ns_name", 0444, &seq_ns_name_fops), | |
2227 | AA_SFS_FILE_FOPS("profiles", 0444, &aa_sfs_profiles_fops), | |
c97204ba | 2228 | AA_SFS_DIR("features", aa_sfs_entry_features), |
9acd494b KC |
2229 | { } |
2230 | }; | |
63e2b423 | 2231 | |
c97204ba JJ |
2232 | static struct aa_sfs_entry aa_sfs_entry = |
2233 | AA_SFS_DIR("apparmor", aa_sfs_entry_apparmor); | |
63e2b423 | 2234 | |
9acd494b | 2235 | /** |
a481f4d9 | 2236 | * entry_create_file - create a file entry in the apparmor securityfs |
c97204ba | 2237 | * @fs_file: aa_sfs_entry to build an entry for (NOT NULL) |
9acd494b KC |
2238 | * @parent: the parent dentry in the securityfs |
2239 | * | |
a481f4d9 | 2240 | * Use entry_remove_file to remove entries created with this fn. |
9acd494b | 2241 | */ |
c97204ba | 2242 | static int __init entry_create_file(struct aa_sfs_entry *fs_file, |
a481f4d9 | 2243 | struct dentry *parent) |
9acd494b KC |
2244 | { |
2245 | int error = 0; | |
2246 | ||
2247 | fs_file->dentry = securityfs_create_file(fs_file->name, | |
2248 | S_IFREG | fs_file->mode, | |
2249 | parent, fs_file, | |
2250 | fs_file->file_ops); | |
2251 | if (IS_ERR(fs_file->dentry)) { | |
2252 | error = PTR_ERR(fs_file->dentry); | |
2253 | fs_file->dentry = NULL; | |
63e2b423 | 2254 | } |
9acd494b | 2255 | return error; |
63e2b423 JJ |
2256 | } |
2257 | ||
c97204ba | 2258 | static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir); |
63e2b423 | 2259 | /** |
a481f4d9 | 2260 | * entry_create_dir - recursively create a directory entry in the securityfs |
c97204ba | 2261 | * @fs_dir: aa_sfs_entry (and all child entries) to build (NOT NULL) |
9acd494b | 2262 | * @parent: the parent dentry in the securityfs |
63e2b423 | 2263 | * |
a481f4d9 | 2264 | * Use entry_remove_dir to remove entries created with this fn. |
63e2b423 | 2265 | */ |
c97204ba JJ |
2266 | static int __init entry_create_dir(struct aa_sfs_entry *fs_dir, |
2267 | struct dentry *parent) | |
63e2b423 | 2268 | { |
c97204ba | 2269 | struct aa_sfs_entry *fs_file; |
0d259f04 JJ |
2270 | struct dentry *dir; |
2271 | int error; | |
63e2b423 | 2272 | |
0d259f04 JJ |
2273 | dir = securityfs_create_dir(fs_dir->name, parent); |
2274 | if (IS_ERR(dir)) | |
2275 | return PTR_ERR(dir); | |
2276 | fs_dir->dentry = dir; | |
63e2b423 | 2277 | |
0d259f04 | 2278 | for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) { |
c97204ba | 2279 | if (fs_file->v_type == AA_SFS_TYPE_DIR) |
a481f4d9 | 2280 | error = entry_create_dir(fs_file, fs_dir->dentry); |
9acd494b | 2281 | else |
a481f4d9 | 2282 | error = entry_create_file(fs_file, fs_dir->dentry); |
9acd494b KC |
2283 | if (error) |
2284 | goto failed; | |
2285 | } | |
2286 | ||
2287 | return 0; | |
2288 | ||
2289 | failed: | |
a481f4d9 | 2290 | entry_remove_dir(fs_dir); |
0d259f04 | 2291 | |
9acd494b KC |
2292 | return error; |
2293 | } | |
2294 | ||
2295 | /** | |
c97204ba JJ |
2296 | * entry_remove_file - drop a single file entry in the apparmor securityfs |
2297 | * @fs_file: aa_sfs_entry to detach from the securityfs (NOT NULL) | |
9acd494b | 2298 | */ |
c97204ba | 2299 | static void __init entry_remove_file(struct aa_sfs_entry *fs_file) |
9acd494b KC |
2300 | { |
2301 | if (!fs_file->dentry) | |
2302 | return; | |
2303 | ||
2304 | securityfs_remove(fs_file->dentry); | |
2305 | fs_file->dentry = NULL; | |
2306 | } | |
2307 | ||
2308 | /** | |
a481f4d9 | 2309 | * entry_remove_dir - recursively drop a directory entry from the securityfs |
c97204ba | 2310 | * @fs_dir: aa_sfs_entry (and all child entries) to detach (NOT NULL) |
9acd494b | 2311 | */ |
c97204ba | 2312 | static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir) |
9acd494b | 2313 | { |
c97204ba | 2314 | struct aa_sfs_entry *fs_file; |
9acd494b | 2315 | |
0d259f04 | 2316 | for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) { |
c97204ba | 2317 | if (fs_file->v_type == AA_SFS_TYPE_DIR) |
a481f4d9 | 2318 | entry_remove_dir(fs_file); |
9acd494b | 2319 | else |
c97204ba | 2320 | entry_remove_file(fs_file); |
9acd494b KC |
2321 | } |
2322 | ||
c97204ba | 2323 | entry_remove_file(fs_dir); |
63e2b423 JJ |
2324 | } |
2325 | ||
2326 | /** | |
2327 | * aa_destroy_aafs - cleanup and free aafs | |
2328 | * | |
2329 | * releases dentries allocated by aa_create_aafs | |
2330 | */ | |
2331 | void __init aa_destroy_aafs(void) | |
2332 | { | |
c97204ba | 2333 | entry_remove_dir(&aa_sfs_entry); |
63e2b423 JJ |
2334 | } |
2335 | ||
a71ada30 JJ |
2336 | |
2337 | #define NULL_FILE_NAME ".null" | |
2338 | struct path aa_null; | |
2339 | ||
2340 | static int aa_mk_null_file(struct dentry *parent) | |
2341 | { | |
2342 | struct vfsmount *mount = NULL; | |
2343 | struct dentry *dentry; | |
2344 | struct inode *inode; | |
2345 | int count = 0; | |
2346 | int error = simple_pin_fs(parent->d_sb->s_type, &mount, &count); | |
2347 | ||
2348 | if (error) | |
2349 | return error; | |
2350 | ||
2351 | inode_lock(d_inode(parent)); | |
2352 | dentry = lookup_one_len(NULL_FILE_NAME, parent, strlen(NULL_FILE_NAME)); | |
2353 | if (IS_ERR(dentry)) { | |
2354 | error = PTR_ERR(dentry); | |
2355 | goto out; | |
2356 | } | |
2357 | inode = new_inode(parent->d_inode->i_sb); | |
2358 | if (!inode) { | |
2359 | error = -ENOMEM; | |
2360 | goto out1; | |
2361 | } | |
2362 | ||
2363 | inode->i_ino = get_next_ino(); | |
2364 | inode->i_mode = S_IFCHR | S_IRUGO | S_IWUGO; | |
24d0d03c | 2365 | inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
a71ada30 JJ |
2366 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, |
2367 | MKDEV(MEM_MAJOR, 3)); | |
2368 | d_instantiate(dentry, inode); | |
2369 | aa_null.dentry = dget(dentry); | |
2370 | aa_null.mnt = mntget(mount); | |
2371 | ||
2372 | error = 0; | |
2373 | ||
2374 | out1: | |
2375 | dput(dentry); | |
2376 | out: | |
2377 | inode_unlock(d_inode(parent)); | |
2378 | simple_release_fs(&mount, &count); | |
2379 | return error; | |
2380 | } | |
2381 | ||
a481f4d9 JJ |
2382 | |
2383 | ||
2384 | static const char *policy_get_link(struct dentry *dentry, | |
2385 | struct inode *inode, | |
2386 | struct delayed_call *done) | |
2387 | { | |
2388 | struct aa_ns *ns; | |
2389 | struct path path; | |
2390 | ||
2391 | if (!dentry) | |
2392 | return ERR_PTR(-ECHILD); | |
2393 | ns = aa_get_current_ns(); | |
2394 | path.mnt = mntget(aafs_mnt); | |
2395 | path.dentry = dget(ns_dir(ns)); | |
2396 | nd_jump_link(&path); | |
2397 | aa_put_ns(ns); | |
2398 | ||
2399 | return NULL; | |
2400 | } | |
2401 | ||
2402 | static int ns_get_name(char *buf, size_t size, struct aa_ns *ns, | |
2403 | struct inode *inode) | |
2404 | { | |
2405 | int res = snprintf(buf, size, "%s:[%lu]", AAFS_NAME, inode->i_ino); | |
2406 | ||
2407 | if (res < 0 || res >= size) | |
2408 | res = -ENOENT; | |
2409 | ||
2410 | return res; | |
2411 | } | |
2412 | ||
2413 | static int policy_readlink(struct dentry *dentry, char __user *buffer, | |
2414 | int buflen) | |
2415 | { | |
2416 | struct aa_ns *ns; | |
2417 | char name[32]; | |
2418 | int res; | |
2419 | ||
2420 | ns = aa_get_current_ns(); | |
2421 | res = ns_get_name(name, sizeof(name), ns, d_inode(dentry)); | |
2422 | if (res >= 0) | |
2423 | res = readlink_copy(buffer, buflen, name); | |
2424 | aa_put_ns(ns); | |
2425 | ||
2426 | return res; | |
2427 | } | |
2428 | ||
2429 | static const struct inode_operations policy_link_iops = { | |
2430 | .readlink = policy_readlink, | |
2431 | .get_link = policy_get_link, | |
2432 | }; | |
2433 | ||
2434 | ||
63e2b423 JJ |
2435 | /** |
2436 | * aa_create_aafs - create the apparmor security filesystem | |
2437 | * | |
2438 | * dentries created here are released by aa_destroy_aafs | |
2439 | * | |
2440 | * Returns: error on failure | |
2441 | */ | |
3417d8d5 | 2442 | static int __init aa_create_aafs(void) |
63e2b423 | 2443 | { |
b7fd2c03 | 2444 | struct dentry *dent; |
63e2b423 JJ |
2445 | int error; |
2446 | ||
2447 | if (!apparmor_initialized) | |
2448 | return 0; | |
2449 | ||
c97204ba | 2450 | if (aa_sfs_entry.dentry) { |
63e2b423 JJ |
2451 | AA_ERROR("%s: AppArmor securityfs already exists\n", __func__); |
2452 | return -EEXIST; | |
2453 | } | |
2454 | ||
a481f4d9 JJ |
2455 | /* setup apparmorfs used to virtualize policy/ */ |
2456 | aafs_mnt = kern_mount(&aafs_ops); | |
2457 | if (IS_ERR(aafs_mnt)) | |
2458 | panic("can't set apparmorfs up\n"); | |
2459 | aafs_mnt->mnt_sb->s_flags &= ~MS_NOUSER; | |
2460 | ||
9acd494b | 2461 | /* Populate fs tree. */ |
c97204ba | 2462 | error = entry_create_dir(&aa_sfs_entry, NULL); |
63e2b423 JJ |
2463 | if (error) |
2464 | goto error; | |
2465 | ||
c97204ba | 2466 | dent = securityfs_create_file(".load", 0666, aa_sfs_entry.dentry, |
b7fd2c03 JJ |
2467 | NULL, &aa_fs_profile_load); |
2468 | if (IS_ERR(dent)) { | |
2469 | error = PTR_ERR(dent); | |
2470 | goto error; | |
2471 | } | |
2472 | ns_subload(root_ns) = dent; | |
2473 | ||
c97204ba | 2474 | dent = securityfs_create_file(".replace", 0666, aa_sfs_entry.dentry, |
b7fd2c03 JJ |
2475 | NULL, &aa_fs_profile_replace); |
2476 | if (IS_ERR(dent)) { | |
2477 | error = PTR_ERR(dent); | |
2478 | goto error; | |
2479 | } | |
2480 | ns_subreplace(root_ns) = dent; | |
2481 | ||
c97204ba | 2482 | dent = securityfs_create_file(".remove", 0666, aa_sfs_entry.dentry, |
b7fd2c03 JJ |
2483 | NULL, &aa_fs_profile_remove); |
2484 | if (IS_ERR(dent)) { | |
2485 | error = PTR_ERR(dent); | |
2486 | goto error; | |
2487 | } | |
2488 | ns_subremove(root_ns) = dent; | |
2489 | ||
d9bf2c26 JJ |
2490 | dent = securityfs_create_file("revision", 0444, aa_sfs_entry.dentry, |
2491 | NULL, &aa_fs_ns_revision_fops); | |
2492 | if (IS_ERR(dent)) { | |
2493 | error = PTR_ERR(dent); | |
2494 | goto error; | |
2495 | } | |
2496 | ns_subrevision(root_ns) = dent; | |
2497 | ||
2498 | /* policy tree referenced by magic policy symlink */ | |
b7fd2c03 | 2499 | mutex_lock(&root_ns->lock); |
c961ee5f JJ |
2500 | error = __aafs_ns_mkdir(root_ns, aafs_mnt->mnt_root, ".policy", |
2501 | aafs_mnt->mnt_root); | |
b7fd2c03 | 2502 | mutex_unlock(&root_ns->lock); |
0d259f04 JJ |
2503 | if (error) |
2504 | goto error; | |
2505 | ||
c961ee5f JJ |
2506 | /* magic symlink similar to nsfs redirects based on task policy */ |
2507 | dent = securityfs_create_symlink("policy", aa_sfs_entry.dentry, | |
2508 | NULL, &policy_link_iops); | |
2509 | if (IS_ERR(dent)) { | |
2510 | error = PTR_ERR(dent); | |
2511 | goto error; | |
2512 | } | |
2513 | ||
c97204ba | 2514 | error = aa_mk_null_file(aa_sfs_entry.dentry); |
a71ada30 JJ |
2515 | if (error) |
2516 | goto error; | |
2517 | ||
2518 | /* TODO: add default profile to apparmorfs */ | |
63e2b423 JJ |
2519 | |
2520 | /* Report that AppArmor fs is enabled */ | |
2521 | aa_info_message("AppArmor Filesystem Enabled"); | |
2522 | return 0; | |
2523 | ||
2524 | error: | |
2525 | aa_destroy_aafs(); | |
2526 | AA_ERROR("Error creating AppArmor securityfs\n"); | |
2527 | return error; | |
2528 | } | |
2529 | ||
2530 | fs_initcall(aa_create_aafs); |