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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> | |
876979c9 | 18 | #include <linux/init.h> |
63e2b423 JJ |
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" | |
d8889d49 | 33 | #include "include/cred.h" |
f8eb8a13 | 34 | #include "include/crypto.h" |
cd1dbf76 | 35 | #include "include/ipc.h" |
317d9a05 | 36 | #include "include/label.h" |
63e2b423 | 37 | #include "include/policy.h" |
cff281f6 | 38 | #include "include/policy_ns.h" |
d384b0a1 | 39 | #include "include/resource.h" |
5ac8c355 | 40 | #include "include/policy_unpack.h" |
63e2b423 | 41 | |
c97204ba JJ |
42 | /* |
43 | * The apparmor filesystem interface used for policy load and introspection | |
44 | * The interface is split into two main components based on their function | |
45 | * a securityfs component: | |
46 | * used for static files that are always available, and which allows | |
47 | * userspace to specificy the location of the security filesystem. | |
48 | * | |
49 | * fns and data are prefixed with | |
50 | * aa_sfs_ | |
51 | * | |
52 | * an apparmorfs component: | |
53 | * used loaded policy content and introspection. It is not part of a | |
54 | * regular mounted filesystem and is available only through the magic | |
55 | * policy symlink in the root of the securityfs apparmor/ directory. | |
56 | * Tasks queries will be magically redirected to the correct portion | |
57 | * of the policy tree based on their confinement. | |
58 | * | |
59 | * fns and data are prefixed with | |
60 | * aafs_ | |
61 | * | |
62 | * The aa_fs_ prefix is used to indicate the fn is used by both the | |
63 | * securityfs and apparmorfs filesystems. | |
64 | */ | |
65 | ||
66 | ||
67 | /* | |
68 | * support fns | |
69 | */ | |
70 | ||
0d259f04 JJ |
71 | /** |
72 | * aa_mangle_name - mangle a profile name to std profile layout form | |
73 | * @name: profile name to mangle (NOT NULL) | |
74 | * @target: buffer to store mangled name, same length as @name (MAYBE NULL) | |
75 | * | |
76 | * Returns: length of mangled name | |
77 | */ | |
bbe4a7c8 | 78 | static int mangle_name(const char *name, char *target) |
0d259f04 JJ |
79 | { |
80 | char *t = target; | |
81 | ||
82 | while (*name == '/' || *name == '.') | |
83 | name++; | |
84 | ||
85 | if (target) { | |
86 | for (; *name; name++) { | |
87 | if (*name == '/') | |
88 | *(t)++ = '.'; | |
89 | else if (isspace(*name)) | |
90 | *(t)++ = '_'; | |
91 | else if (isalnum(*name) || strchr("._-", *name)) | |
92 | *(t)++ = *name; | |
93 | } | |
94 | ||
95 | *t = 0; | |
96 | } else { | |
97 | int len = 0; | |
98 | for (; *name; name++) { | |
99 | if (isalnum(*name) || isspace(*name) || | |
100 | strchr("/._-", *name)) | |
101 | len++; | |
102 | } | |
103 | ||
104 | return len; | |
105 | } | |
106 | ||
107 | return t - target; | |
108 | } | |
109 | ||
a481f4d9 JJ |
110 | |
111 | /* | |
112 | * aafs - core fns and data for the policy tree | |
113 | */ | |
114 | ||
115 | #define AAFS_NAME "apparmorfs" | |
116 | static struct vfsmount *aafs_mnt; | |
117 | static int aafs_count; | |
118 | ||
119 | ||
120 | static int aafs_show_path(struct seq_file *seq, struct dentry *dentry) | |
121 | { | |
a0781209 | 122 | seq_printf(seq, "%s:[%lu]", AAFS_NAME, d_inode(dentry)->i_ino); |
a481f4d9 JJ |
123 | return 0; |
124 | } | |
125 | ||
126 | static void aafs_evict_inode(struct inode *inode) | |
127 | { | |
128 | truncate_inode_pages_final(&inode->i_data); | |
129 | clear_inode(inode); | |
130 | if (S_ISLNK(inode->i_mode)) | |
131 | kfree(inode->i_link); | |
132 | } | |
133 | ||
134 | static const struct super_operations aafs_super_ops = { | |
135 | .statfs = simple_statfs, | |
136 | .evict_inode = aafs_evict_inode, | |
137 | .show_path = aafs_show_path, | |
138 | }; | |
139 | ||
140 | static int fill_super(struct super_block *sb, void *data, int silent) | |
141 | { | |
142 | static struct tree_descr files[] = { {""} }; | |
143 | int error; | |
144 | ||
145 | error = simple_fill_super(sb, AAFS_MAGIC, files); | |
146 | if (error) | |
147 | return error; | |
148 | sb->s_op = &aafs_super_ops; | |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
153 | static struct dentry *aafs_mount(struct file_system_type *fs_type, | |
154 | int flags, const char *dev_name, void *data) | |
155 | { | |
156 | return mount_single(fs_type, flags, data, fill_super); | |
157 | } | |
158 | ||
159 | static struct file_system_type aafs_ops = { | |
160 | .owner = THIS_MODULE, | |
161 | .name = AAFS_NAME, | |
162 | .mount = aafs_mount, | |
163 | .kill_sb = kill_anon_super, | |
164 | }; | |
165 | ||
166 | /** | |
167 | * __aafs_setup_d_inode - basic inode setup for apparmorfs | |
168 | * @dir: parent directory for the dentry | |
169 | * @dentry: dentry we are seting the inode up for | |
170 | * @mode: permissions the file should have | |
171 | * @data: data to store on inode.i_private, available in open() | |
172 | * @link: if symlink, symlink target string | |
173 | * @fops: struct file_operations that should be used | |
174 | * @iops: struct of inode_operations that should be used | |
175 | */ | |
176 | static int __aafs_setup_d_inode(struct inode *dir, struct dentry *dentry, | |
177 | umode_t mode, void *data, char *link, | |
178 | const struct file_operations *fops, | |
179 | const struct inode_operations *iops) | |
180 | { | |
181 | struct inode *inode = new_inode(dir->i_sb); | |
182 | ||
183 | AA_BUG(!dir); | |
184 | AA_BUG(!dentry); | |
185 | ||
186 | if (!inode) | |
187 | return -ENOMEM; | |
188 | ||
189 | inode->i_ino = get_next_ino(); | |
190 | inode->i_mode = mode; | |
191 | inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); | |
192 | inode->i_private = data; | |
193 | if (S_ISDIR(mode)) { | |
194 | inode->i_op = iops ? iops : &simple_dir_inode_operations; | |
195 | inode->i_fop = &simple_dir_operations; | |
196 | inc_nlink(inode); | |
197 | inc_nlink(dir); | |
198 | } else if (S_ISLNK(mode)) { | |
199 | inode->i_op = iops ? iops : &simple_symlink_inode_operations; | |
200 | inode->i_link = link; | |
201 | } else { | |
202 | inode->i_fop = fops; | |
203 | } | |
204 | d_instantiate(dentry, inode); | |
205 | dget(dentry); | |
206 | ||
207 | return 0; | |
208 | } | |
209 | ||
210 | /** | |
211 | * aafs_create - create a dentry in the apparmorfs filesystem | |
212 | * | |
213 | * @name: name of dentry to create | |
214 | * @mode: permissions the file should have | |
215 | * @parent: parent directory for this dentry | |
216 | * @data: data to store on inode.i_private, available in open() | |
217 | * @link: if symlink, symlink target string | |
218 | * @fops: struct file_operations that should be used for | |
219 | * @iops: struct of inode_operations that should be used | |
220 | * | |
221 | * This is the basic "create a xxx" function for apparmorfs. | |
222 | * | |
223 | * Returns a pointer to a dentry if it succeeds, that must be free with | |
224 | * aafs_remove(). Will return ERR_PTR on failure. | |
225 | */ | |
226 | static struct dentry *aafs_create(const char *name, umode_t mode, | |
227 | struct dentry *parent, void *data, void *link, | |
228 | const struct file_operations *fops, | |
229 | const struct inode_operations *iops) | |
230 | { | |
231 | struct dentry *dentry; | |
232 | struct inode *dir; | |
233 | int error; | |
234 | ||
235 | AA_BUG(!name); | |
236 | AA_BUG(!parent); | |
237 | ||
238 | if (!(mode & S_IFMT)) | |
239 | mode = (mode & S_IALLUGO) | S_IFREG; | |
240 | ||
241 | error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count); | |
242 | if (error) | |
243 | return ERR_PTR(error); | |
244 | ||
245 | dir = d_inode(parent); | |
246 | ||
247 | inode_lock(dir); | |
248 | dentry = lookup_one_len(name, parent, strlen(name)); | |
5d314a81 DC |
249 | if (IS_ERR(dentry)) { |
250 | error = PTR_ERR(dentry); | |
a481f4d9 | 251 | goto fail_lock; |
5d314a81 | 252 | } |
a481f4d9 JJ |
253 | |
254 | if (d_really_is_positive(dentry)) { | |
255 | error = -EEXIST; | |
256 | goto fail_dentry; | |
257 | } | |
258 | ||
259 | error = __aafs_setup_d_inode(dir, dentry, mode, data, link, fops, iops); | |
260 | if (error) | |
261 | goto fail_dentry; | |
262 | inode_unlock(dir); | |
263 | ||
264 | return dentry; | |
265 | ||
266 | fail_dentry: | |
267 | dput(dentry); | |
268 | ||
269 | fail_lock: | |
270 | inode_unlock(dir); | |
271 | simple_release_fs(&aafs_mnt, &aafs_count); | |
272 | ||
273 | return ERR_PTR(error); | |
274 | } | |
275 | ||
276 | /** | |
277 | * aafs_create_file - create a file in the apparmorfs filesystem | |
278 | * | |
279 | * @name: name of dentry to create | |
280 | * @mode: permissions the file should have | |
281 | * @parent: parent directory for this dentry | |
282 | * @data: data to store on inode.i_private, available in open() | |
283 | * @fops: struct file_operations that should be used for | |
284 | * | |
285 | * see aafs_create | |
286 | */ | |
287 | static struct dentry *aafs_create_file(const char *name, umode_t mode, | |
288 | struct dentry *parent, void *data, | |
289 | const struct file_operations *fops) | |
290 | { | |
291 | return aafs_create(name, mode, parent, data, NULL, fops, NULL); | |
292 | } | |
293 | ||
294 | /** | |
295 | * aafs_create_dir - create a directory in the apparmorfs filesystem | |
296 | * | |
297 | * @name: name of dentry to create | |
298 | * @parent: parent directory for this dentry | |
299 | * | |
300 | * see aafs_create | |
301 | */ | |
302 | static struct dentry *aafs_create_dir(const char *name, struct dentry *parent) | |
303 | { | |
304 | return aafs_create(name, S_IFDIR | 0755, parent, NULL, NULL, NULL, | |
305 | NULL); | |
306 | } | |
307 | ||
308 | /** | |
309 | * aafs_create_symlink - create a symlink in the apparmorfs filesystem | |
310 | * @name: name of dentry to create | |
311 | * @parent: parent directory for this dentry | |
312 | * @target: if symlink, symlink target string | |
1180b4c7 | 313 | * @private: private data |
a481f4d9 JJ |
314 | * @iops: struct of inode_operations that should be used |
315 | * | |
316 | * If @target parameter is %NULL, then the @iops parameter needs to be | |
317 | * setup to handle .readlink and .get_link inode_operations. | |
318 | */ | |
319 | static struct dentry *aafs_create_symlink(const char *name, | |
320 | struct dentry *parent, | |
321 | const char *target, | |
1180b4c7 | 322 | void *private, |
a481f4d9 JJ |
323 | const struct inode_operations *iops) |
324 | { | |
325 | struct dentry *dent; | |
326 | char *link = NULL; | |
327 | ||
328 | if (target) { | |
a481f4d9 JJ |
329 | if (!link) |
330 | return ERR_PTR(-ENOMEM); | |
331 | } | |
1180b4c7 | 332 | dent = aafs_create(name, S_IFLNK | 0444, parent, private, link, NULL, |
a481f4d9 JJ |
333 | iops); |
334 | if (IS_ERR(dent)) | |
335 | kfree(link); | |
336 | ||
337 | return dent; | |
338 | } | |
339 | ||
340 | /** | |
341 | * aafs_remove - removes a file or directory from the apparmorfs filesystem | |
342 | * | |
343 | * @dentry: dentry of the file/directory/symlink to removed. | |
344 | */ | |
345 | static void aafs_remove(struct dentry *dentry) | |
346 | { | |
347 | struct inode *dir; | |
348 | ||
349 | if (!dentry || IS_ERR(dentry)) | |
350 | return; | |
351 | ||
352 | dir = d_inode(dentry->d_parent); | |
353 | inode_lock(dir); | |
354 | if (simple_positive(dentry)) { | |
355 | if (d_is_dir(dentry)) | |
356 | simple_rmdir(dir, dentry); | |
357 | else | |
358 | simple_unlink(dir, dentry); | |
359 | dput(dentry); | |
360 | } | |
361 | inode_unlock(dir); | |
362 | simple_release_fs(&aafs_mnt, &aafs_count); | |
363 | } | |
364 | ||
365 | ||
366 | /* | |
367 | * aa_fs - policy load/replace/remove | |
368 | */ | |
369 | ||
63e2b423 JJ |
370 | /** |
371 | * aa_simple_write_to_buffer - common routine for getting policy from user | |
63e2b423 | 372 | * @userbuf: user buffer to copy data from (NOT NULL) |
3ed02ada | 373 | * @alloc_size: size of user buffer (REQUIRES: @alloc_size >= @copy_size) |
63e2b423 JJ |
374 | * @copy_size: size of data to copy from user buffer |
375 | * @pos: position write is at in the file (NOT NULL) | |
376 | * | |
377 | * Returns: kernel buffer containing copy of user buffer data or an | |
378 | * ERR_PTR on failure. | |
379 | */ | |
5ef50d01 | 380 | static struct aa_loaddata *aa_simple_write_to_buffer(const char __user *userbuf, |
5ac8c355 JJ |
381 | size_t alloc_size, |
382 | size_t copy_size, | |
383 | loff_t *pos) | |
63e2b423 | 384 | { |
5ac8c355 | 385 | struct aa_loaddata *data; |
63e2b423 | 386 | |
e6bfa25d | 387 | AA_BUG(copy_size > alloc_size); |
3ed02ada | 388 | |
63e2b423 JJ |
389 | if (*pos != 0) |
390 | /* only writes from pos 0, that is complete writes */ | |
391 | return ERR_PTR(-ESPIPE); | |
392 | ||
63e2b423 | 393 | /* freed by caller to simple_write_to_buffer */ |
5d5182ca JJ |
394 | data = aa_loaddata_alloc(alloc_size); |
395 | if (IS_ERR(data)) | |
396 | return data; | |
63e2b423 | 397 | |
5d5182ca | 398 | data->size = copy_size; |
5ac8c355 | 399 | if (copy_from_user(data->data, userbuf, copy_size)) { |
63e2b423 JJ |
400 | kvfree(data); |
401 | return ERR_PTR(-EFAULT); | |
402 | } | |
403 | ||
404 | return data; | |
405 | } | |
406 | ||
18e99f19 | 407 | static ssize_t policy_update(u32 mask, const char __user *buf, size_t size, |
b7fd2c03 | 408 | loff_t *pos, struct aa_ns *ns) |
63e2b423 | 409 | { |
5ac8c355 | 410 | struct aa_loaddata *data; |
637f688d JJ |
411 | struct aa_label *label; |
412 | ssize_t error; | |
cf797c0e | 413 | |
637f688d | 414 | label = begin_current_label_crit_section(); |
cf797c0e | 415 | |
5ac8c355 JJ |
416 | /* high level check about policy management - fine grained in |
417 | * below after unpack | |
418 | */ | |
637f688d | 419 | error = aa_may_manage_policy(label, ns, mask); |
5ac8c355 JJ |
420 | if (error) |
421 | return error; | |
63e2b423 | 422 | |
5ef50d01 | 423 | data = aa_simple_write_to_buffer(buf, size, size, pos); |
63e2b423 JJ |
424 | error = PTR_ERR(data); |
425 | if (!IS_ERR(data)) { | |
637f688d | 426 | error = aa_replace_profiles(ns, label, mask, data); |
5ac8c355 | 427 | aa_put_loaddata(data); |
63e2b423 | 428 | } |
637f688d | 429 | end_current_label_crit_section(label); |
63e2b423 JJ |
430 | |
431 | return error; | |
432 | } | |
433 | ||
b7fd2c03 | 434 | /* .load file hook fn to load policy */ |
5ac8c355 JJ |
435 | static ssize_t profile_load(struct file *f, const char __user *buf, size_t size, |
436 | loff_t *pos) | |
437 | { | |
b7fd2c03 | 438 | struct aa_ns *ns = aa_get_ns(f->f_inode->i_private); |
18e99f19 | 439 | int error = policy_update(AA_MAY_LOAD_POLICY, buf, size, pos, ns); |
b7fd2c03 JJ |
440 | |
441 | aa_put_ns(ns); | |
5ac8c355 JJ |
442 | |
443 | return error; | |
444 | } | |
445 | ||
63e2b423 | 446 | static const struct file_operations aa_fs_profile_load = { |
6038f373 AB |
447 | .write = profile_load, |
448 | .llseek = default_llseek, | |
63e2b423 JJ |
449 | }; |
450 | ||
451 | /* .replace file hook fn to load and/or replace policy */ | |
452 | static ssize_t profile_replace(struct file *f, const char __user *buf, | |
453 | size_t size, loff_t *pos) | |
454 | { | |
b7fd2c03 | 455 | struct aa_ns *ns = aa_get_ns(f->f_inode->i_private); |
18e99f19 JJ |
456 | int error = policy_update(AA_MAY_LOAD_POLICY | AA_MAY_REPLACE_POLICY, |
457 | buf, size, pos, ns); | |
b7fd2c03 | 458 | aa_put_ns(ns); |
63e2b423 JJ |
459 | |
460 | return error; | |
461 | } | |
462 | ||
463 | static const struct file_operations aa_fs_profile_replace = { | |
6038f373 AB |
464 | .write = profile_replace, |
465 | .llseek = default_llseek, | |
63e2b423 JJ |
466 | }; |
467 | ||
b7fd2c03 | 468 | /* .remove file hook fn to remove loaded policy */ |
63e2b423 JJ |
469 | static ssize_t profile_remove(struct file *f, const char __user *buf, |
470 | size_t size, loff_t *pos) | |
471 | { | |
5ac8c355 | 472 | struct aa_loaddata *data; |
637f688d | 473 | struct aa_label *label; |
63e2b423 | 474 | ssize_t error; |
b7fd2c03 | 475 | struct aa_ns *ns = aa_get_ns(f->f_inode->i_private); |
63e2b423 | 476 | |
637f688d | 477 | label = begin_current_label_crit_section(); |
5ac8c355 JJ |
478 | /* high level check about policy management - fine grained in |
479 | * below after unpack | |
480 | */ | |
637f688d | 481 | error = aa_may_manage_policy(label, ns, AA_MAY_REMOVE_POLICY); |
5ac8c355 JJ |
482 | if (error) |
483 | goto out; | |
484 | ||
63e2b423 JJ |
485 | /* |
486 | * aa_remove_profile needs a null terminated string so 1 extra | |
487 | * byte is allocated and the copied data is null terminated. | |
488 | */ | |
5ef50d01 | 489 | data = aa_simple_write_to_buffer(buf, size + 1, size, pos); |
63e2b423 JJ |
490 | |
491 | error = PTR_ERR(data); | |
492 | if (!IS_ERR(data)) { | |
5ac8c355 | 493 | data->data[size] = 0; |
637f688d | 494 | error = aa_remove_profiles(ns, label, data->data, size); |
5ac8c355 | 495 | aa_put_loaddata(data); |
63e2b423 | 496 | } |
5ac8c355 | 497 | out: |
637f688d | 498 | end_current_label_crit_section(label); |
b7fd2c03 | 499 | aa_put_ns(ns); |
63e2b423 JJ |
500 | return error; |
501 | } | |
502 | ||
503 | static const struct file_operations aa_fs_profile_remove = { | |
6038f373 AB |
504 | .write = profile_remove, |
505 | .llseek = default_llseek, | |
63e2b423 JJ |
506 | }; |
507 | ||
d9bf2c26 JJ |
508 | struct aa_revision { |
509 | struct aa_ns *ns; | |
510 | long last_read; | |
511 | }; | |
512 | ||
513 | /* revision file hook fn for policy loads */ | |
514 | static int ns_revision_release(struct inode *inode, struct file *file) | |
515 | { | |
516 | struct aa_revision *rev = file->private_data; | |
517 | ||
518 | if (rev) { | |
519 | aa_put_ns(rev->ns); | |
520 | kfree(rev); | |
521 | } | |
522 | ||
523 | return 0; | |
524 | } | |
525 | ||
526 | static ssize_t ns_revision_read(struct file *file, char __user *buf, | |
527 | size_t size, loff_t *ppos) | |
528 | { | |
529 | struct aa_revision *rev = file->private_data; | |
530 | char buffer[32]; | |
531 | long last_read; | |
532 | int avail; | |
533 | ||
feb3c766 | 534 | mutex_lock_nested(&rev->ns->lock, rev->ns->level); |
d9bf2c26 JJ |
535 | last_read = rev->last_read; |
536 | if (last_read == rev->ns->revision) { | |
537 | mutex_unlock(&rev->ns->lock); | |
538 | if (file->f_flags & O_NONBLOCK) | |
539 | return -EAGAIN; | |
540 | if (wait_event_interruptible(rev->ns->wait, | |
541 | last_read != | |
542 | READ_ONCE(rev->ns->revision))) | |
543 | return -ERESTARTSYS; | |
feb3c766 | 544 | mutex_lock_nested(&rev->ns->lock, rev->ns->level); |
d9bf2c26 JJ |
545 | } |
546 | ||
547 | avail = sprintf(buffer, "%ld\n", rev->ns->revision); | |
548 | if (*ppos + size > avail) { | |
549 | rev->last_read = rev->ns->revision; | |
550 | *ppos = 0; | |
551 | } | |
552 | mutex_unlock(&rev->ns->lock); | |
553 | ||
554 | return simple_read_from_buffer(buf, size, ppos, buffer, avail); | |
555 | } | |
556 | ||
557 | static int ns_revision_open(struct inode *inode, struct file *file) | |
558 | { | |
559 | struct aa_revision *rev = kzalloc(sizeof(*rev), GFP_KERNEL); | |
560 | ||
561 | if (!rev) | |
562 | return -ENOMEM; | |
563 | ||
564 | rev->ns = aa_get_ns(inode->i_private); | |
565 | if (!rev->ns) | |
566 | rev->ns = aa_get_current_ns(); | |
567 | file->private_data = rev; | |
568 | ||
569 | return 0; | |
570 | } | |
571 | ||
e6c5a7d9 | 572 | static __poll_t ns_revision_poll(struct file *file, poll_table *pt) |
d9bf2c26 JJ |
573 | { |
574 | struct aa_revision *rev = file->private_data; | |
e6c5a7d9 | 575 | __poll_t mask = 0; |
d9bf2c26 JJ |
576 | |
577 | if (rev) { | |
feb3c766 | 578 | mutex_lock_nested(&rev->ns->lock, rev->ns->level); |
d9bf2c26 JJ |
579 | poll_wait(file, &rev->ns->wait, pt); |
580 | if (rev->last_read < rev->ns->revision) | |
a9a08845 | 581 | mask |= EPOLLIN | EPOLLRDNORM; |
d9bf2c26 JJ |
582 | mutex_unlock(&rev->ns->lock); |
583 | } | |
584 | ||
585 | return mask; | |
586 | } | |
587 | ||
5d5182ca JJ |
588 | void __aa_bump_ns_revision(struct aa_ns *ns) |
589 | { | |
590 | ns->revision++; | |
d9bf2c26 | 591 | wake_up_interruptible(&ns->wait); |
5d5182ca JJ |
592 | } |
593 | ||
d9bf2c26 JJ |
594 | static const struct file_operations aa_fs_ns_revision_fops = { |
595 | .owner = THIS_MODULE, | |
596 | .open = ns_revision_open, | |
597 | .poll = ns_revision_poll, | |
598 | .read = ns_revision_read, | |
599 | .llseek = generic_file_llseek, | |
600 | .release = ns_revision_release, | |
601 | }; | |
602 | ||
4f3b3f2d JJ |
603 | static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms, |
604 | const char *match_str, size_t match_len) | |
605 | { | |
f4585bc2 | 606 | struct aa_perms tmp = { }; |
4f3b3f2d JJ |
607 | struct aa_dfa *dfa; |
608 | unsigned int state = 0; | |
609 | ||
637f688d | 610 | if (profile_unconfined(profile)) |
4f3b3f2d JJ |
611 | return; |
612 | if (profile->file.dfa && *match_str == AA_CLASS_FILE) { | |
613 | dfa = profile->file.dfa; | |
614 | state = aa_dfa_match_len(dfa, profile->file.start, | |
615 | match_str + 1, match_len - 1); | |
4f3b3f2d JJ |
616 | if (state) { |
617 | struct path_cond cond = { }; | |
618 | ||
619 | tmp = aa_compute_fperms(dfa, state, &cond); | |
620 | } | |
621 | } else if (profile->policy.dfa) { | |
b9590ad4 | 622 | if (!PROFILE_MEDIATES(profile, *match_str)) |
4f3b3f2d JJ |
623 | return; /* no change to current perms */ |
624 | dfa = profile->policy.dfa; | |
625 | state = aa_dfa_match_len(dfa, profile->policy.start[0], | |
626 | match_str, match_len); | |
627 | if (state) | |
628 | aa_compute_perms(dfa, state, &tmp); | |
4f3b3f2d JJ |
629 | } |
630 | aa_apply_modes_to_perms(profile, &tmp); | |
317d9a05 | 631 | aa_perms_accum_raw(perms, &tmp); |
4f3b3f2d JJ |
632 | } |
633 | ||
634 | ||
e025be0f WH |
635 | /** |
636 | * query_data - queries a policy and writes its data to buf | |
637 | * @buf: the resulting data is stored here (NOT NULL) | |
638 | * @buf_len: size of buf | |
639 | * @query: query string used to retrieve data | |
640 | * @query_len: size of query including second NUL byte | |
641 | * | |
642 | * The buffers pointed to by buf and query may overlap. The query buffer is | |
643 | * parsed before buf is written to. | |
644 | * | |
645 | * The query should look like "<LABEL>\0<KEY>\0", where <LABEL> is the name of | |
646 | * the security confinement context and <KEY> is the name of the data to | |
647 | * retrieve. <LABEL> and <KEY> must not be NUL-terminated. | |
648 | * | |
649 | * Don't expect the contents of buf to be preserved on failure. | |
650 | * | |
651 | * Returns: number of characters written to buf or -errno on failure | |
652 | */ | |
653 | static ssize_t query_data(char *buf, size_t buf_len, | |
654 | char *query, size_t query_len) | |
655 | { | |
656 | char *out; | |
657 | const char *key; | |
317d9a05 | 658 | struct label_it i; |
637f688d | 659 | struct aa_label *label, *curr; |
317d9a05 | 660 | struct aa_profile *profile; |
e025be0f WH |
661 | struct aa_data *data; |
662 | u32 bytes, blocks; | |
663 | __le32 outle32; | |
664 | ||
665 | if (!query_len) | |
666 | return -EINVAL; /* need a query */ | |
667 | ||
668 | key = query + strnlen(query, query_len) + 1; | |
669 | if (key + 1 >= query + query_len) | |
670 | return -EINVAL; /* not enough space for a non-empty key */ | |
671 | if (key + strnlen(key, query + query_len - key) >= query + query_len) | |
672 | return -EINVAL; /* must end with NUL */ | |
673 | ||
674 | if (buf_len < sizeof(bytes) + sizeof(blocks)) | |
675 | return -EINVAL; /* not enough space */ | |
676 | ||
637f688d JJ |
677 | curr = begin_current_label_crit_section(); |
678 | label = aa_label_parse(curr, query, GFP_KERNEL, false, false); | |
679 | end_current_label_crit_section(curr); | |
680 | if (IS_ERR(label)) | |
681 | return PTR_ERR(label); | |
e025be0f WH |
682 | |
683 | /* We are going to leave space for two numbers. The first is the total | |
684 | * number of bytes we are writing after the first number. This is so | |
685 | * users can read the full output without reallocation. | |
686 | * | |
687 | * The second number is the number of data blocks we're writing. An | |
688 | * application might be confined by multiple policies having data in | |
689 | * the same key. | |
690 | */ | |
691 | memset(buf, 0, sizeof(bytes) + sizeof(blocks)); | |
692 | out = buf + sizeof(bytes) + sizeof(blocks); | |
693 | ||
694 | blocks = 0; | |
317d9a05 JJ |
695 | label_for_each_confined(i, label, profile) { |
696 | if (!profile->data) | |
697 | continue; | |
698 | ||
699 | data = rhashtable_lookup_fast(profile->data, &key, | |
700 | profile->data->p); | |
e025be0f WH |
701 | |
702 | if (data) { | |
317d9a05 JJ |
703 | if (out + sizeof(outle32) + data->size > buf + |
704 | buf_len) { | |
637f688d | 705 | aa_put_label(label); |
e025be0f | 706 | return -EINVAL; /* not enough space */ |
637f688d | 707 | } |
e025be0f WH |
708 | outle32 = __cpu_to_le32(data->size); |
709 | memcpy(out, &outle32, sizeof(outle32)); | |
710 | out += sizeof(outle32); | |
711 | memcpy(out, data->data, data->size); | |
712 | out += data->size; | |
713 | blocks++; | |
714 | } | |
715 | } | |
637f688d | 716 | aa_put_label(label); |
e025be0f WH |
717 | |
718 | outle32 = __cpu_to_le32(out - buf - sizeof(bytes)); | |
719 | memcpy(buf, &outle32, sizeof(outle32)); | |
720 | outle32 = __cpu_to_le32(blocks); | |
721 | memcpy(buf + sizeof(bytes), &outle32, sizeof(outle32)); | |
722 | ||
723 | return out - buf; | |
724 | } | |
725 | ||
4f3b3f2d JJ |
726 | /** |
727 | * query_label - queries a label and writes permissions to buf | |
728 | * @buf: the resulting permissions string is stored here (NOT NULL) | |
729 | * @buf_len: size of buf | |
730 | * @query: binary query string to match against the dfa | |
731 | * @query_len: size of query | |
732 | * @view_only: only compute for querier's view | |
733 | * | |
734 | * The buffers pointed to by buf and query may overlap. The query buffer is | |
735 | * parsed before buf is written to. | |
736 | * | |
737 | * The query should look like "LABEL_NAME\0DFA_STRING" where LABEL_NAME is | |
738 | * the name of the label, in the current namespace, that is to be queried and | |
739 | * DFA_STRING is a binary string to match against the label(s)'s DFA. | |
740 | * | |
741 | * LABEL_NAME must be NUL terminated. DFA_STRING may contain NUL characters | |
742 | * but must *not* be NUL terminated. | |
743 | * | |
744 | * Returns: number of characters written to buf or -errno on failure | |
745 | */ | |
746 | static ssize_t query_label(char *buf, size_t buf_len, | |
747 | char *query, size_t query_len, bool view_only) | |
748 | { | |
317d9a05 | 749 | struct aa_profile *profile; |
637f688d | 750 | struct aa_label *label, *curr; |
4f3b3f2d JJ |
751 | char *label_name, *match_str; |
752 | size_t label_name_len, match_len; | |
753 | struct aa_perms perms; | |
317d9a05 | 754 | struct label_it i; |
4f3b3f2d JJ |
755 | |
756 | if (!query_len) | |
757 | return -EINVAL; | |
758 | ||
759 | label_name = query; | |
760 | label_name_len = strnlen(query, query_len); | |
761 | if (!label_name_len || label_name_len == query_len) | |
762 | return -EINVAL; | |
763 | ||
764 | /** | |
765 | * The extra byte is to account for the null byte between the | |
766 | * profile name and dfa string. profile_name_len is greater | |
767 | * than zero and less than query_len, so a byte can be safely | |
768 | * added or subtracted. | |
769 | */ | |
770 | match_str = label_name + label_name_len + 1; | |
771 | match_len = query_len - label_name_len - 1; | |
772 | ||
637f688d JJ |
773 | curr = begin_current_label_crit_section(); |
774 | label = aa_label_parse(curr, label_name, GFP_KERNEL, false, false); | |
775 | end_current_label_crit_section(curr); | |
776 | if (IS_ERR(label)) | |
777 | return PTR_ERR(label); | |
4f3b3f2d JJ |
778 | |
779 | perms = allperms; | |
317d9a05 JJ |
780 | if (view_only) { |
781 | label_for_each_in_ns(i, labels_ns(label), label, profile) { | |
782 | profile_query_cb(profile, &perms, match_str, match_len); | |
783 | } | |
784 | } else { | |
785 | label_for_each(i, label, profile) { | |
786 | profile_query_cb(profile, &perms, match_str, match_len); | |
787 | } | |
788 | } | |
789 | aa_put_label(label); | |
4f3b3f2d JJ |
790 | |
791 | return scnprintf(buf, buf_len, | |
792 | "allow 0x%08x\ndeny 0x%08x\naudit 0x%08x\nquiet 0x%08x\n", | |
793 | perms.allow, perms.deny, perms.audit, perms.quiet); | |
794 | } | |
795 | ||
1dea3b41 JJ |
796 | /* |
797 | * Transaction based IO. | |
798 | * The file expects a write which triggers the transaction, and then | |
799 | * possibly a read(s) which collects the result - which is stored in a | |
800 | * file-local buffer. Once a new write is performed, a new set of results | |
801 | * are stored in the file-local buffer. | |
802 | */ | |
803 | struct multi_transaction { | |
804 | struct kref count; | |
805 | ssize_t size; | |
806 | char data[0]; | |
807 | }; | |
808 | ||
809 | #define MULTI_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct multi_transaction)) | |
810 | /* TODO: replace with per file lock */ | |
811 | static DEFINE_SPINLOCK(multi_transaction_lock); | |
812 | ||
813 | static void multi_transaction_kref(struct kref *kref) | |
814 | { | |
815 | struct multi_transaction *t; | |
816 | ||
817 | t = container_of(kref, struct multi_transaction, count); | |
818 | free_page((unsigned long) t); | |
819 | } | |
820 | ||
821 | static struct multi_transaction * | |
822 | get_multi_transaction(struct multi_transaction *t) | |
823 | { | |
824 | if (t) | |
825 | kref_get(&(t->count)); | |
826 | ||
827 | return t; | |
828 | } | |
829 | ||
830 | static void put_multi_transaction(struct multi_transaction *t) | |
831 | { | |
832 | if (t) | |
833 | kref_put(&(t->count), multi_transaction_kref); | |
834 | } | |
835 | ||
836 | /* does not increment @new's count */ | |
837 | static void multi_transaction_set(struct file *file, | |
838 | struct multi_transaction *new, size_t n) | |
839 | { | |
840 | struct multi_transaction *old; | |
841 | ||
842 | AA_BUG(n > MULTI_TRANSACTION_LIMIT); | |
843 | ||
844 | new->size = n; | |
845 | spin_lock(&multi_transaction_lock); | |
846 | old = (struct multi_transaction *) file->private_data; | |
847 | file->private_data = new; | |
848 | spin_unlock(&multi_transaction_lock); | |
849 | put_multi_transaction(old); | |
850 | } | |
851 | ||
852 | static struct multi_transaction *multi_transaction_new(struct file *file, | |
853 | const char __user *buf, | |
854 | size_t size) | |
855 | { | |
856 | struct multi_transaction *t; | |
857 | ||
858 | if (size > MULTI_TRANSACTION_LIMIT - 1) | |
859 | return ERR_PTR(-EFBIG); | |
860 | ||
861 | t = (struct multi_transaction *)get_zeroed_page(GFP_KERNEL); | |
862 | if (!t) | |
863 | return ERR_PTR(-ENOMEM); | |
864 | kref_init(&t->count); | |
865 | if (copy_from_user(t->data, buf, size)) | |
866 | return ERR_PTR(-EFAULT); | |
867 | ||
868 | return t; | |
869 | } | |
870 | ||
871 | static ssize_t multi_transaction_read(struct file *file, char __user *buf, | |
872 | size_t size, loff_t *pos) | |
873 | { | |
874 | struct multi_transaction *t; | |
875 | ssize_t ret; | |
876 | ||
877 | spin_lock(&multi_transaction_lock); | |
878 | t = get_multi_transaction(file->private_data); | |
879 | spin_unlock(&multi_transaction_lock); | |
880 | if (!t) | |
881 | return 0; | |
882 | ||
883 | ret = simple_read_from_buffer(buf, size, pos, t->data, t->size); | |
884 | put_multi_transaction(t); | |
885 | ||
886 | return ret; | |
887 | } | |
888 | ||
889 | static int multi_transaction_release(struct inode *inode, struct file *file) | |
890 | { | |
891 | put_multi_transaction(file->private_data); | |
892 | ||
893 | return 0; | |
894 | } | |
895 | ||
317d9a05 JJ |
896 | #define QUERY_CMD_LABEL "label\0" |
897 | #define QUERY_CMD_LABEL_LEN 6 | |
4f3b3f2d JJ |
898 | #define QUERY_CMD_PROFILE "profile\0" |
899 | #define QUERY_CMD_PROFILE_LEN 8 | |
317d9a05 JJ |
900 | #define QUERY_CMD_LABELALL "labelall\0" |
901 | #define QUERY_CMD_LABELALL_LEN 9 | |
e025be0f WH |
902 | #define QUERY_CMD_DATA "data\0" |
903 | #define QUERY_CMD_DATA_LEN 5 | |
904 | ||
905 | /** | |
906 | * aa_write_access - generic permissions and data query | |
907 | * @file: pointer to open apparmorfs/access file | |
908 | * @ubuf: user buffer containing the complete query string (NOT NULL) | |
909 | * @count: size of ubuf | |
910 | * @ppos: position in the file (MUST BE ZERO) | |
911 | * | |
912 | * Allows for one permissions or data query per open(), write(), and read() | |
913 | * sequence. The only queries currently supported are label-based queries for | |
914 | * permissions or data. | |
915 | * | |
916 | * For permissions queries, ubuf must begin with "label\0", followed by the | |
917 | * profile query specific format described in the query_label() function | |
918 | * documentation. | |
919 | * | |
920 | * For data queries, ubuf must have the form "data\0<LABEL>\0<KEY>\0", where | |
921 | * <LABEL> is the name of the security confinement context and <KEY> is the | |
922 | * name of the data to retrieve. | |
923 | * | |
924 | * Returns: number of bytes written or -errno on failure | |
925 | */ | |
926 | static ssize_t aa_write_access(struct file *file, const char __user *ubuf, | |
927 | size_t count, loff_t *ppos) | |
928 | { | |
1dea3b41 | 929 | struct multi_transaction *t; |
e025be0f WH |
930 | ssize_t len; |
931 | ||
932 | if (*ppos) | |
933 | return -ESPIPE; | |
934 | ||
1dea3b41 JJ |
935 | t = multi_transaction_new(file, ubuf, count); |
936 | if (IS_ERR(t)) | |
937 | return PTR_ERR(t); | |
e025be0f | 938 | |
4f3b3f2d JJ |
939 | if (count > QUERY_CMD_PROFILE_LEN && |
940 | !memcmp(t->data, QUERY_CMD_PROFILE, QUERY_CMD_PROFILE_LEN)) { | |
941 | len = query_label(t->data, MULTI_TRANSACTION_LIMIT, | |
942 | t->data + QUERY_CMD_PROFILE_LEN, | |
943 | count - QUERY_CMD_PROFILE_LEN, true); | |
317d9a05 JJ |
944 | } else if (count > QUERY_CMD_LABEL_LEN && |
945 | !memcmp(t->data, QUERY_CMD_LABEL, QUERY_CMD_LABEL_LEN)) { | |
946 | len = query_label(t->data, MULTI_TRANSACTION_LIMIT, | |
947 | t->data + QUERY_CMD_LABEL_LEN, | |
948 | count - QUERY_CMD_LABEL_LEN, true); | |
949 | } else if (count > QUERY_CMD_LABELALL_LEN && | |
950 | !memcmp(t->data, QUERY_CMD_LABELALL, | |
951 | QUERY_CMD_LABELALL_LEN)) { | |
952 | len = query_label(t->data, MULTI_TRANSACTION_LIMIT, | |
953 | t->data + QUERY_CMD_LABELALL_LEN, | |
954 | count - QUERY_CMD_LABELALL_LEN, false); | |
4f3b3f2d | 955 | } else if (count > QUERY_CMD_DATA_LEN && |
1dea3b41 JJ |
956 | !memcmp(t->data, QUERY_CMD_DATA, QUERY_CMD_DATA_LEN)) { |
957 | len = query_data(t->data, MULTI_TRANSACTION_LIMIT, | |
958 | t->data + QUERY_CMD_DATA_LEN, | |
e025be0f WH |
959 | count - QUERY_CMD_DATA_LEN); |
960 | } else | |
961 | len = -EINVAL; | |
962 | ||
1dea3b41 JJ |
963 | if (len < 0) { |
964 | put_multi_transaction(t); | |
e025be0f | 965 | return len; |
1dea3b41 | 966 | } |
e025be0f | 967 | |
1dea3b41 | 968 | multi_transaction_set(file, t, len); |
e025be0f WH |
969 | |
970 | return count; | |
971 | } | |
972 | ||
c97204ba | 973 | static const struct file_operations aa_sfs_access = { |
e025be0f | 974 | .write = aa_write_access, |
1dea3b41 JJ |
975 | .read = multi_transaction_read, |
976 | .release = multi_transaction_release, | |
e025be0f WH |
977 | .llseek = generic_file_llseek, |
978 | }; | |
979 | ||
c97204ba | 980 | static int aa_sfs_seq_show(struct seq_file *seq, void *v) |
e74abcf3 | 981 | { |
c97204ba | 982 | struct aa_sfs_entry *fs_file = seq->private; |
e74abcf3 KC |
983 | |
984 | if (!fs_file) | |
985 | return 0; | |
986 | ||
987 | switch (fs_file->v_type) { | |
c97204ba | 988 | case AA_SFS_TYPE_BOOLEAN: |
e74abcf3 KC |
989 | seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no"); |
990 | break; | |
c97204ba | 991 | case AA_SFS_TYPE_STRING: |
a9bf8e9f KC |
992 | seq_printf(seq, "%s\n", fs_file->v.string); |
993 | break; | |
c97204ba | 994 | case AA_SFS_TYPE_U64: |
e74abcf3 KC |
995 | seq_printf(seq, "%#08lx\n", fs_file->v.u64); |
996 | break; | |
997 | default: | |
998 | /* Ignore unpritable entry types. */ | |
999 | break; | |
1000 | } | |
1001 | ||
1002 | return 0; | |
1003 | } | |
1004 | ||
c97204ba | 1005 | static int aa_sfs_seq_open(struct inode *inode, struct file *file) |
e74abcf3 | 1006 | { |
c97204ba | 1007 | return single_open(file, aa_sfs_seq_show, inode->i_private); |
e74abcf3 KC |
1008 | } |
1009 | ||
c97204ba | 1010 | const struct file_operations aa_sfs_seq_file_ops = { |
e74abcf3 | 1011 | .owner = THIS_MODULE, |
c97204ba | 1012 | .open = aa_sfs_seq_open, |
e74abcf3 KC |
1013 | .read = seq_read, |
1014 | .llseek = seq_lseek, | |
1015 | .release = single_release, | |
1016 | }; | |
1017 | ||
52b97de3 JJ |
1018 | /* |
1019 | * profile based file operations | |
1020 | * policy/profiles/XXXX/profiles/ * | |
1021 | */ | |
1022 | ||
1023 | #define SEQ_PROFILE_FOPS(NAME) \ | |
1024 | static int seq_profile_ ##NAME ##_open(struct inode *inode, struct file *file)\ | |
1025 | { \ | |
1026 | return seq_profile_open(inode, file, seq_profile_ ##NAME ##_show); \ | |
1027 | } \ | |
1028 | \ | |
1029 | static const struct file_operations seq_profile_ ##NAME ##_fops = { \ | |
1030 | .owner = THIS_MODULE, \ | |
1031 | .open = seq_profile_ ##NAME ##_open, \ | |
1032 | .read = seq_read, \ | |
1033 | .llseek = seq_lseek, \ | |
1034 | .release = seq_profile_release, \ | |
1035 | } \ | |
1036 | ||
1037 | static int seq_profile_open(struct inode *inode, struct file *file, | |
1038 | int (*show)(struct seq_file *, void *)) | |
0d259f04 | 1039 | { |
8399588a JJ |
1040 | struct aa_proxy *proxy = aa_get_proxy(inode->i_private); |
1041 | int error = single_open(file, show, proxy); | |
0d259f04 JJ |
1042 | |
1043 | if (error) { | |
1044 | file->private_data = NULL; | |
8399588a | 1045 | aa_put_proxy(proxy); |
0d259f04 JJ |
1046 | } |
1047 | ||
1048 | return error; | |
1049 | } | |
1050 | ||
52b97de3 | 1051 | static int seq_profile_release(struct inode *inode, struct file *file) |
0d259f04 JJ |
1052 | { |
1053 | struct seq_file *seq = (struct seq_file *) file->private_data; | |
1054 | if (seq) | |
8399588a | 1055 | aa_put_proxy(seq->private); |
0d259f04 JJ |
1056 | return single_release(inode, file); |
1057 | } | |
1058 | ||
52b97de3 | 1059 | static int seq_profile_name_show(struct seq_file *seq, void *v) |
0d259f04 | 1060 | { |
8399588a | 1061 | struct aa_proxy *proxy = seq->private; |
637f688d JJ |
1062 | struct aa_label *label = aa_get_label_rcu(&proxy->label); |
1063 | struct aa_profile *profile = labels_profile(label); | |
0d259f04 | 1064 | seq_printf(seq, "%s\n", profile->base.name); |
637f688d | 1065 | aa_put_label(label); |
0d259f04 JJ |
1066 | |
1067 | return 0; | |
1068 | } | |
1069 | ||
52b97de3 | 1070 | static int seq_profile_mode_show(struct seq_file *seq, void *v) |
0d259f04 | 1071 | { |
8399588a | 1072 | struct aa_proxy *proxy = seq->private; |
637f688d JJ |
1073 | struct aa_label *label = aa_get_label_rcu(&proxy->label); |
1074 | struct aa_profile *profile = labels_profile(label); | |
0d259f04 | 1075 | seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]); |
637f688d | 1076 | aa_put_label(label); |
0d259f04 JJ |
1077 | |
1078 | return 0; | |
1079 | } | |
1080 | ||
52b97de3 | 1081 | static int seq_profile_attach_show(struct seq_file *seq, void *v) |
556d0be7 | 1082 | { |
8399588a | 1083 | struct aa_proxy *proxy = seq->private; |
637f688d JJ |
1084 | struct aa_label *label = aa_get_label_rcu(&proxy->label); |
1085 | struct aa_profile *profile = labels_profile(label); | |
556d0be7 JJ |
1086 | if (profile->attach) |
1087 | seq_printf(seq, "%s\n", profile->attach); | |
1088 | else if (profile->xmatch) | |
1089 | seq_puts(seq, "<unknown>\n"); | |
1090 | else | |
1091 | seq_printf(seq, "%s\n", profile->base.name); | |
637f688d | 1092 | aa_put_label(label); |
556d0be7 JJ |
1093 | |
1094 | return 0; | |
1095 | } | |
1096 | ||
52b97de3 | 1097 | static int seq_profile_hash_show(struct seq_file *seq, void *v) |
f8eb8a13 | 1098 | { |
8399588a | 1099 | struct aa_proxy *proxy = seq->private; |
637f688d JJ |
1100 | struct aa_label *label = aa_get_label_rcu(&proxy->label); |
1101 | struct aa_profile *profile = labels_profile(label); | |
f8eb8a13 JJ |
1102 | unsigned int i, size = aa_hash_size(); |
1103 | ||
1104 | if (profile->hash) { | |
1105 | for (i = 0; i < size; i++) | |
1106 | seq_printf(seq, "%.2x", profile->hash[i]); | |
47dbd1cd | 1107 | seq_putc(seq, '\n'); |
f8eb8a13 | 1108 | } |
637f688d | 1109 | aa_put_label(label); |
f8eb8a13 JJ |
1110 | |
1111 | return 0; | |
1112 | } | |
1113 | ||
52b97de3 JJ |
1114 | SEQ_PROFILE_FOPS(name); |
1115 | SEQ_PROFILE_FOPS(mode); | |
1116 | SEQ_PROFILE_FOPS(attach); | |
1117 | SEQ_PROFILE_FOPS(hash); | |
f8eb8a13 | 1118 | |
64c86970 JJ |
1119 | /* |
1120 | * namespace based files | |
1121 | * several root files and | |
1122 | * policy/ * | |
1123 | */ | |
f8eb8a13 | 1124 | |
64c86970 JJ |
1125 | #define SEQ_NS_FOPS(NAME) \ |
1126 | static int seq_ns_ ##NAME ##_open(struct inode *inode, struct file *file) \ | |
1127 | { \ | |
1128 | return single_open(file, seq_ns_ ##NAME ##_show, inode->i_private); \ | |
1129 | } \ | |
1130 | \ | |
1131 | static const struct file_operations seq_ns_ ##NAME ##_fops = { \ | |
1132 | .owner = THIS_MODULE, \ | |
1133 | .open = seq_ns_ ##NAME ##_open, \ | |
1134 | .read = seq_read, \ | |
1135 | .llseek = seq_lseek, \ | |
1136 | .release = single_release, \ | |
1137 | } \ | |
3e3e5695 | 1138 | |
40cde7fc JJ |
1139 | static int seq_ns_stacked_show(struct seq_file *seq, void *v) |
1140 | { | |
1141 | struct aa_label *label; | |
1142 | ||
1143 | label = begin_current_label_crit_section(); | |
1144 | seq_printf(seq, "%s\n", label->size > 1 ? "yes" : "no"); | |
1145 | end_current_label_crit_section(label); | |
1146 | ||
1147 | return 0; | |
1148 | } | |
1149 | ||
1150 | static int seq_ns_nsstacked_show(struct seq_file *seq, void *v) | |
1151 | { | |
1152 | struct aa_label *label; | |
1153 | struct aa_profile *profile; | |
1154 | struct label_it it; | |
1155 | int count = 1; | |
1156 | ||
1157 | label = begin_current_label_crit_section(); | |
1158 | ||
1159 | if (label->size > 1) { | |
1160 | label_for_each(it, label, profile) | |
1161 | if (profile->ns != labels_ns(label)) { | |
1162 | count++; | |
1163 | break; | |
1164 | } | |
1165 | } | |
1166 | ||
1167 | seq_printf(seq, "%s\n", count > 1 ? "yes" : "no"); | |
1168 | end_current_label_crit_section(label); | |
1169 | ||
1170 | return 0; | |
1171 | } | |
1172 | ||
64c86970 | 1173 | static int seq_ns_level_show(struct seq_file *seq, void *v) |
a71ada30 | 1174 | { |
637f688d | 1175 | struct aa_label *label; |
a71ada30 | 1176 | |
637f688d JJ |
1177 | label = begin_current_label_crit_section(); |
1178 | seq_printf(seq, "%d\n", labels_ns(label)->level); | |
1179 | end_current_label_crit_section(label); | |
a71ada30 JJ |
1180 | |
1181 | return 0; | |
1182 | } | |
1183 | ||
64c86970 | 1184 | static int seq_ns_name_show(struct seq_file *seq, void *v) |
3e3e5695 | 1185 | { |
637f688d | 1186 | struct aa_label *label = begin_current_label_crit_section(); |
040d9e2b | 1187 | seq_printf(seq, "%s\n", labels_ns(label)->base.name); |
637f688d | 1188 | end_current_label_crit_section(label); |
3e3e5695 JJ |
1189 | |
1190 | return 0; | |
1191 | } | |
1192 | ||
40cde7fc JJ |
1193 | SEQ_NS_FOPS(stacked); |
1194 | SEQ_NS_FOPS(nsstacked); | |
64c86970 JJ |
1195 | SEQ_NS_FOPS(level); |
1196 | SEQ_NS_FOPS(name); | |
3e3e5695 | 1197 | |
5d5182ca JJ |
1198 | |
1199 | /* policy/raw_data/ * file ops */ | |
1200 | ||
1201 | #define SEQ_RAWDATA_FOPS(NAME) \ | |
1202 | static int seq_rawdata_ ##NAME ##_open(struct inode *inode, struct file *file)\ | |
1203 | { \ | |
1204 | return seq_rawdata_open(inode, file, seq_rawdata_ ##NAME ##_show); \ | |
1205 | } \ | |
1206 | \ | |
1207 | static const struct file_operations seq_rawdata_ ##NAME ##_fops = { \ | |
1208 | .owner = THIS_MODULE, \ | |
1209 | .open = seq_rawdata_ ##NAME ##_open, \ | |
1210 | .read = seq_read, \ | |
1211 | .llseek = seq_lseek, \ | |
1212 | .release = seq_rawdata_release, \ | |
1213 | } \ | |
1214 | ||
1215 | static int seq_rawdata_open(struct inode *inode, struct file *file, | |
1216 | int (*show)(struct seq_file *, void *)) | |
5ac8c355 | 1217 | { |
5d5182ca JJ |
1218 | struct aa_loaddata *data = __aa_get_loaddata(inode->i_private); |
1219 | int error; | |
5ac8c355 | 1220 | |
5d5182ca JJ |
1221 | if (!data) |
1222 | /* lost race this ent is being reaped */ | |
1223 | return -ENOENT; | |
1224 | ||
1225 | error = single_open(file, show, data); | |
1226 | if (error) { | |
1227 | AA_BUG(file->private_data && | |
1228 | ((struct seq_file *)file->private_data)->private); | |
1229 | aa_put_loaddata(data); | |
1230 | } | |
1231 | ||
1232 | return error; | |
5ac8c355 JJ |
1233 | } |
1234 | ||
5d5182ca | 1235 | static int seq_rawdata_release(struct inode *inode, struct file *file) |
5ac8c355 | 1236 | { |
5d5182ca | 1237 | struct seq_file *seq = (struct seq_file *) file->private_data; |
5ac8c355 | 1238 | |
5d5182ca JJ |
1239 | if (seq) |
1240 | aa_put_loaddata(seq->private); | |
0ff3d97f | 1241 | |
5d5182ca JJ |
1242 | return single_release(inode, file); |
1243 | } | |
1244 | ||
1245 | static int seq_rawdata_abi_show(struct seq_file *seq, void *v) | |
1246 | { | |
1247 | struct aa_loaddata *data = seq->private; | |
1248 | ||
1249 | seq_printf(seq, "v%d\n", data->abi); | |
5ac8c355 JJ |
1250 | |
1251 | return 0; | |
1252 | } | |
1253 | ||
5d5182ca | 1254 | static int seq_rawdata_revision_show(struct seq_file *seq, void *v) |
5ac8c355 | 1255 | { |
5d5182ca | 1256 | struct aa_loaddata *data = seq->private; |
5ac8c355 | 1257 | |
5d5182ca JJ |
1258 | seq_printf(seq, "%ld\n", data->revision); |
1259 | ||
1260 | return 0; | |
1261 | } | |
5ac8c355 | 1262 | |
5d5182ca | 1263 | static int seq_rawdata_hash_show(struct seq_file *seq, void *v) |
5ac8c355 | 1264 | { |
5d5182ca | 1265 | struct aa_loaddata *data = seq->private; |
5ac8c355 JJ |
1266 | unsigned int i, size = aa_hash_size(); |
1267 | ||
5d5182ca | 1268 | if (data->hash) { |
5ac8c355 | 1269 | for (i = 0; i < size; i++) |
5d5182ca | 1270 | seq_printf(seq, "%.2x", data->hash[i]); |
47dbd1cd | 1271 | seq_putc(seq, '\n'); |
5ac8c355 | 1272 | } |
5ac8c355 JJ |
1273 | |
1274 | return 0; | |
1275 | } | |
1276 | ||
5d5182ca JJ |
1277 | SEQ_RAWDATA_FOPS(abi); |
1278 | SEQ_RAWDATA_FOPS(revision); | |
1279 | SEQ_RAWDATA_FOPS(hash); | |
5ac8c355 JJ |
1280 | |
1281 | static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size, | |
1282 | loff_t *ppos) | |
1283 | { | |
1284 | struct aa_loaddata *rawdata = file->private_data; | |
1285 | ||
1286 | return simple_read_from_buffer(buf, size, ppos, rawdata->data, | |
1287 | rawdata->size); | |
1288 | } | |
1289 | ||
5d5182ca | 1290 | static int rawdata_release(struct inode *inode, struct file *file) |
5ac8c355 | 1291 | { |
5d5182ca JJ |
1292 | aa_put_loaddata(file->private_data); |
1293 | ||
1294 | return 0; | |
1295 | } | |
5ac8c355 | 1296 | |
5d5182ca JJ |
1297 | static int rawdata_open(struct inode *inode, struct file *file) |
1298 | { | |
5ac8c355 JJ |
1299 | if (!policy_view_capable(NULL)) |
1300 | return -EACCES; | |
5d5182ca JJ |
1301 | file->private_data = __aa_get_loaddata(inode->i_private); |
1302 | if (!file->private_data) | |
1303 | /* lost race: this entry is being reaped */ | |
1304 | return -ENOENT; | |
5ac8c355 JJ |
1305 | |
1306 | return 0; | |
1307 | } | |
1308 | ||
5d5182ca | 1309 | static const struct file_operations rawdata_fops = { |
5ac8c355 JJ |
1310 | .open = rawdata_open, |
1311 | .read = rawdata_read, | |
1312 | .llseek = generic_file_llseek, | |
1313 | .release = rawdata_release, | |
1314 | }; | |
1315 | ||
5d5182ca JJ |
1316 | static void remove_rawdata_dents(struct aa_loaddata *rawdata) |
1317 | { | |
1318 | int i; | |
1319 | ||
1320 | for (i = 0; i < AAFS_LOADDATA_NDENTS; i++) { | |
1321 | if (!IS_ERR_OR_NULL(rawdata->dents[i])) { | |
1322 | /* no refcounts on i_private */ | |
c961ee5f | 1323 | aafs_remove(rawdata->dents[i]); |
5d5182ca JJ |
1324 | rawdata->dents[i] = NULL; |
1325 | } | |
1326 | } | |
1327 | } | |
1328 | ||
1329 | void __aa_fs_remove_rawdata(struct aa_loaddata *rawdata) | |
1330 | { | |
1331 | AA_BUG(rawdata->ns && !mutex_is_locked(&rawdata->ns->lock)); | |
1332 | ||
1333 | if (rawdata->ns) { | |
1334 | remove_rawdata_dents(rawdata); | |
1335 | list_del_init(&rawdata->list); | |
1336 | aa_put_ns(rawdata->ns); | |
1337 | rawdata->ns = NULL; | |
1338 | } | |
1339 | } | |
1340 | ||
1341 | int __aa_fs_create_rawdata(struct aa_ns *ns, struct aa_loaddata *rawdata) | |
1342 | { | |
1343 | struct dentry *dent, *dir; | |
1344 | ||
1345 | AA_BUG(!ns); | |
1346 | AA_BUG(!rawdata); | |
1347 | AA_BUG(!mutex_is_locked(&ns->lock)); | |
1348 | AA_BUG(!ns_subdata_dir(ns)); | |
1349 | ||
1350 | /* | |
1351 | * just use ns revision dir was originally created at. This is | |
1352 | * under ns->lock and if load is successful revision will be | |
1353 | * bumped and is guaranteed to be unique | |
1354 | */ | |
1355 | rawdata->name = kasprintf(GFP_KERNEL, "%ld", ns->revision); | |
1356 | if (!rawdata->name) | |
1357 | return -ENOMEM; | |
1358 | ||
c961ee5f | 1359 | dir = aafs_create_dir(rawdata->name, ns_subdata_dir(ns)); |
5d5182ca JJ |
1360 | if (IS_ERR(dir)) |
1361 | /* ->name freed when rawdata freed */ | |
1362 | return PTR_ERR(dir); | |
1363 | rawdata->dents[AAFS_LOADDATA_DIR] = dir; | |
1364 | ||
c961ee5f | 1365 | dent = aafs_create_file("abi", S_IFREG | 0444, dir, rawdata, |
5d5182ca JJ |
1366 | &seq_rawdata_abi_fops); |
1367 | if (IS_ERR(dent)) | |
1368 | goto fail; | |
1369 | rawdata->dents[AAFS_LOADDATA_ABI] = dent; | |
1370 | ||
c961ee5f | 1371 | dent = aafs_create_file("revision", S_IFREG | 0444, dir, rawdata, |
5d5182ca JJ |
1372 | &seq_rawdata_revision_fops); |
1373 | if (IS_ERR(dent)) | |
1374 | goto fail; | |
1375 | rawdata->dents[AAFS_LOADDATA_REVISION] = dent; | |
1376 | ||
1377 | if (aa_g_hash_policy) { | |
c961ee5f | 1378 | dent = aafs_create_file("sha1", S_IFREG | 0444, dir, |
5d5182ca JJ |
1379 | rawdata, &seq_rawdata_hash_fops); |
1380 | if (IS_ERR(dent)) | |
1381 | goto fail; | |
1382 | rawdata->dents[AAFS_LOADDATA_HASH] = dent; | |
1383 | } | |
1384 | ||
c961ee5f | 1385 | dent = aafs_create_file("raw_data", S_IFREG | 0444, |
5d5182ca JJ |
1386 | dir, rawdata, &rawdata_fops); |
1387 | if (IS_ERR(dent)) | |
1388 | goto fail; | |
1389 | rawdata->dents[AAFS_LOADDATA_DATA] = dent; | |
1390 | d_inode(dent)->i_size = rawdata->size; | |
1391 | ||
1392 | rawdata->ns = aa_get_ns(ns); | |
1393 | list_add(&rawdata->list, &ns->rawdata_list); | |
1394 | /* no refcount on inode rawdata */ | |
1395 | ||
1396 | return 0; | |
1397 | ||
1398 | fail: | |
1399 | remove_rawdata_dents(rawdata); | |
1400 | ||
1401 | return PTR_ERR(dent); | |
1402 | } | |
1403 | ||
0d259f04 | 1404 | /** fns to setup dynamic per profile/namespace files **/ |
c97204ba JJ |
1405 | |
1406 | /** | |
1407 | * | |
1408 | * Requires: @profile->ns->lock held | |
1409 | */ | |
1410 | void __aafs_profile_rmdir(struct aa_profile *profile) | |
0d259f04 JJ |
1411 | { |
1412 | struct aa_profile *child; | |
1413 | int i; | |
1414 | ||
1415 | if (!profile) | |
1416 | return; | |
1417 | ||
1418 | list_for_each_entry(child, &profile->base.profiles, base.list) | |
c97204ba | 1419 | __aafs_profile_rmdir(child); |
0d259f04 JJ |
1420 | |
1421 | for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) { | |
8399588a | 1422 | struct aa_proxy *proxy; |
0d259f04 JJ |
1423 | if (!profile->dents[i]) |
1424 | continue; | |
1425 | ||
8399588a | 1426 | proxy = d_inode(profile->dents[i])->i_private; |
c961ee5f | 1427 | aafs_remove(profile->dents[i]); |
8399588a | 1428 | aa_put_proxy(proxy); |
0d259f04 JJ |
1429 | profile->dents[i] = NULL; |
1430 | } | |
1431 | } | |
1432 | ||
c97204ba JJ |
1433 | /** |
1434 | * | |
1435 | * Requires: @old->ns->lock held | |
1436 | */ | |
1437 | void __aafs_profile_migrate_dents(struct aa_profile *old, | |
1438 | struct aa_profile *new) | |
0d259f04 JJ |
1439 | { |
1440 | int i; | |
1441 | ||
cbf2d0e1 JJ |
1442 | AA_BUG(!old); |
1443 | AA_BUG(!new); | |
1444 | AA_BUG(!mutex_is_locked(&profiles_ns(old)->lock)); | |
1445 | ||
0d259f04 JJ |
1446 | for (i = 0; i < AAFS_PROF_SIZEOF; i++) { |
1447 | new->dents[i] = old->dents[i]; | |
d671e890 | 1448 | if (new->dents[i]) |
078cd827 | 1449 | new->dents[i]->d_inode->i_mtime = current_time(new->dents[i]->d_inode); |
0d259f04 JJ |
1450 | old->dents[i] = NULL; |
1451 | } | |
1452 | } | |
1453 | ||
1454 | static struct dentry *create_profile_file(struct dentry *dir, const char *name, | |
1455 | struct aa_profile *profile, | |
1456 | const struct file_operations *fops) | |
1457 | { | |
637f688d | 1458 | struct aa_proxy *proxy = aa_get_proxy(profile->label.proxy); |
0d259f04 JJ |
1459 | struct dentry *dent; |
1460 | ||
c961ee5f | 1461 | dent = aafs_create_file(name, S_IFREG | 0444, dir, proxy, fops); |
0d259f04 | 1462 | if (IS_ERR(dent)) |
8399588a | 1463 | aa_put_proxy(proxy); |
0d259f04 JJ |
1464 | |
1465 | return dent; | |
1466 | } | |
1467 | ||
5d5182ca JJ |
1468 | static int profile_depth(struct aa_profile *profile) |
1469 | { | |
1470 | int depth = 0; | |
1471 | ||
1472 | rcu_read_lock(); | |
1473 | for (depth = 0; profile; profile = rcu_access_pointer(profile->parent)) | |
1474 | depth++; | |
1475 | rcu_read_unlock(); | |
1476 | ||
1477 | return depth; | |
1478 | } | |
1479 | ||
1180b4c7 | 1480 | static char *gen_symlink_name(int depth, const char *dirname, const char *fname) |
5d5182ca | 1481 | { |
1180b4c7 | 1482 | char *buffer, *s; |
5d5182ca | 1483 | int error; |
1180b4c7 JJ |
1484 | int size = depth * 6 + strlen(dirname) + strlen(fname) + 11; |
1485 | ||
1486 | s = buffer = kmalloc(size, GFP_KERNEL); | |
1487 | if (!buffer) | |
1488 | return ERR_PTR(-ENOMEM); | |
5d5182ca JJ |
1489 | |
1490 | for (; depth > 0; depth--) { | |
1180b4c7 JJ |
1491 | strcpy(s, "../../"); |
1492 | s += 6; | |
1493 | size -= 6; | |
5d5182ca JJ |
1494 | } |
1495 | ||
1180b4c7 | 1496 | error = snprintf(s, size, "raw_data/%s/%s", dirname, fname); |
588558eb CIK |
1497 | if (error >= size || error < 0) { |
1498 | kfree(buffer); | |
1180b4c7 | 1499 | return ERR_PTR(-ENAMETOOLONG); |
588558eb | 1500 | } |
5d5182ca | 1501 | |
1180b4c7 JJ |
1502 | return buffer; |
1503 | } | |
1504 | ||
1505 | static void rawdata_link_cb(void *arg) | |
1506 | { | |
1507 | kfree(arg); | |
1508 | } | |
1509 | ||
1510 | static const char *rawdata_get_link_base(struct dentry *dentry, | |
1511 | struct inode *inode, | |
1512 | struct delayed_call *done, | |
1513 | const char *name) | |
1514 | { | |
1515 | struct aa_proxy *proxy = inode->i_private; | |
1516 | struct aa_label *label; | |
1517 | struct aa_profile *profile; | |
1518 | char *target; | |
1519 | int depth; | |
1520 | ||
1521 | if (!dentry) | |
1522 | return ERR_PTR(-ECHILD); | |
1523 | ||
1524 | label = aa_get_label_rcu(&proxy->label); | |
1525 | profile = labels_profile(label); | |
1526 | depth = profile_depth(profile); | |
1527 | target = gen_symlink_name(depth, profile->rawdata->name, name); | |
1528 | aa_put_label(label); | |
1529 | ||
1530 | if (IS_ERR(target)) | |
1531 | return target; | |
1532 | ||
1533 | set_delayed_call(done, rawdata_link_cb, target); | |
1534 | ||
1535 | return target; | |
1536 | } | |
1537 | ||
1538 | static const char *rawdata_get_link_sha1(struct dentry *dentry, | |
1539 | struct inode *inode, | |
1540 | struct delayed_call *done) | |
1541 | { | |
1542 | return rawdata_get_link_base(dentry, inode, done, "sha1"); | |
1543 | } | |
1544 | ||
1545 | static const char *rawdata_get_link_abi(struct dentry *dentry, | |
1546 | struct inode *inode, | |
1547 | struct delayed_call *done) | |
1548 | { | |
1549 | return rawdata_get_link_base(dentry, inode, done, "abi"); | |
5d5182ca JJ |
1550 | } |
1551 | ||
1180b4c7 JJ |
1552 | static const char *rawdata_get_link_data(struct dentry *dentry, |
1553 | struct inode *inode, | |
1554 | struct delayed_call *done) | |
1555 | { | |
1556 | return rawdata_get_link_base(dentry, inode, done, "raw_data"); | |
5d5182ca JJ |
1557 | } |
1558 | ||
1180b4c7 JJ |
1559 | static const struct inode_operations rawdata_link_sha1_iops = { |
1560 | .get_link = rawdata_get_link_sha1, | |
1561 | }; | |
1562 | ||
1563 | static const struct inode_operations rawdata_link_abi_iops = { | |
1564 | .get_link = rawdata_get_link_abi, | |
1565 | }; | |
1566 | static const struct inode_operations rawdata_link_data_iops = { | |
1567 | .get_link = rawdata_get_link_data, | |
1568 | }; | |
1569 | ||
1570 | ||
5d5182ca JJ |
1571 | /* |
1572 | * Requires: @profile->ns->lock held | |
1573 | */ | |
c97204ba | 1574 | int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent) |
0d259f04 JJ |
1575 | { |
1576 | struct aa_profile *child; | |
1577 | struct dentry *dent = NULL, *dir; | |
1578 | int error; | |
1579 | ||
cbf2d0e1 JJ |
1580 | AA_BUG(!profile); |
1581 | AA_BUG(!mutex_is_locked(&profiles_ns(profile)->lock)); | |
1582 | ||
0d259f04 JJ |
1583 | if (!parent) { |
1584 | struct aa_profile *p; | |
1585 | p = aa_deref_parent(profile); | |
1586 | dent = prof_dir(p); | |
1587 | /* adding to parent that previously didn't have children */ | |
c961ee5f | 1588 | dent = aafs_create_dir("profiles", dent); |
0d259f04 JJ |
1589 | if (IS_ERR(dent)) |
1590 | goto fail; | |
1591 | prof_child_dir(p) = parent = dent; | |
1592 | } | |
1593 | ||
1594 | if (!profile->dirname) { | |
1595 | int len, id_len; | |
1596 | len = mangle_name(profile->base.name, NULL); | |
1597 | id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id); | |
1598 | ||
1599 | profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL); | |
ffac1de6 DC |
1600 | if (!profile->dirname) { |
1601 | error = -ENOMEM; | |
1602 | goto fail2; | |
1603 | } | |
0d259f04 JJ |
1604 | |
1605 | mangle_name(profile->base.name, profile->dirname); | |
1606 | sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++); | |
1607 | } | |
1608 | ||
c961ee5f | 1609 | dent = aafs_create_dir(profile->dirname, parent); |
0d259f04 JJ |
1610 | if (IS_ERR(dent)) |
1611 | goto fail; | |
1612 | prof_dir(profile) = dir = dent; | |
1613 | ||
52b97de3 JJ |
1614 | dent = create_profile_file(dir, "name", profile, |
1615 | &seq_profile_name_fops); | |
0d259f04 JJ |
1616 | if (IS_ERR(dent)) |
1617 | goto fail; | |
1618 | profile->dents[AAFS_PROF_NAME] = dent; | |
1619 | ||
52b97de3 JJ |
1620 | dent = create_profile_file(dir, "mode", profile, |
1621 | &seq_profile_mode_fops); | |
0d259f04 JJ |
1622 | if (IS_ERR(dent)) |
1623 | goto fail; | |
1624 | profile->dents[AAFS_PROF_MODE] = dent; | |
1625 | ||
556d0be7 | 1626 | dent = create_profile_file(dir, "attach", profile, |
52b97de3 | 1627 | &seq_profile_attach_fops); |
556d0be7 JJ |
1628 | if (IS_ERR(dent)) |
1629 | goto fail; | |
1630 | profile->dents[AAFS_PROF_ATTACH] = dent; | |
1631 | ||
f8eb8a13 JJ |
1632 | if (profile->hash) { |
1633 | dent = create_profile_file(dir, "sha1", profile, | |
52b97de3 | 1634 | &seq_profile_hash_fops); |
f8eb8a13 JJ |
1635 | if (IS_ERR(dent)) |
1636 | goto fail; | |
1637 | profile->dents[AAFS_PROF_HASH] = dent; | |
1638 | } | |
1639 | ||
5ac8c355 | 1640 | if (profile->rawdata) { |
1180b4c7 JJ |
1641 | dent = aafs_create_symlink("raw_sha1", dir, NULL, |
1642 | profile->label.proxy, | |
1643 | &rawdata_link_sha1_iops); | |
5ac8c355 JJ |
1644 | if (IS_ERR(dent)) |
1645 | goto fail; | |
1180b4c7 | 1646 | aa_get_proxy(profile->label.proxy); |
5ac8c355 JJ |
1647 | profile->dents[AAFS_PROF_RAW_HASH] = dent; |
1648 | ||
1180b4c7 JJ |
1649 | dent = aafs_create_symlink("raw_abi", dir, NULL, |
1650 | profile->label.proxy, | |
1651 | &rawdata_link_abi_iops); | |
5ac8c355 JJ |
1652 | if (IS_ERR(dent)) |
1653 | goto fail; | |
1180b4c7 | 1654 | aa_get_proxy(profile->label.proxy); |
5ac8c355 JJ |
1655 | profile->dents[AAFS_PROF_RAW_ABI] = dent; |
1656 | ||
1180b4c7 JJ |
1657 | dent = aafs_create_symlink("raw_data", dir, NULL, |
1658 | profile->label.proxy, | |
1659 | &rawdata_link_data_iops); | |
5ac8c355 JJ |
1660 | if (IS_ERR(dent)) |
1661 | goto fail; | |
1180b4c7 | 1662 | aa_get_proxy(profile->label.proxy); |
5ac8c355 | 1663 | profile->dents[AAFS_PROF_RAW_DATA] = dent; |
5ac8c355 JJ |
1664 | } |
1665 | ||
0d259f04 | 1666 | list_for_each_entry(child, &profile->base.profiles, base.list) { |
c97204ba | 1667 | error = __aafs_profile_mkdir(child, prof_child_dir(profile)); |
0d259f04 JJ |
1668 | if (error) |
1669 | goto fail2; | |
1670 | } | |
1671 | ||
1672 | return 0; | |
1673 | ||
1674 | fail: | |
1675 | error = PTR_ERR(dent); | |
1676 | ||
1677 | fail2: | |
c97204ba | 1678 | __aafs_profile_rmdir(profile); |
0d259f04 JJ |
1679 | |
1680 | return error; | |
1681 | } | |
1682 | ||
4ae47f33 JJ |
1683 | static int ns_mkdir_op(struct inode *dir, struct dentry *dentry, umode_t mode) |
1684 | { | |
1685 | struct aa_ns *ns, *parent; | |
1686 | /* TODO: improve permission check */ | |
637f688d JJ |
1687 | struct aa_label *label; |
1688 | int error; | |
1689 | ||
1690 | label = begin_current_label_crit_section(); | |
1691 | error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY); | |
1692 | end_current_label_crit_section(label); | |
4ae47f33 JJ |
1693 | if (error) |
1694 | return error; | |
1695 | ||
1696 | parent = aa_get_ns(dir->i_private); | |
1697 | AA_BUG(d_inode(ns_subns_dir(parent)) != dir); | |
1698 | ||
1699 | /* we have to unlock and then relock to get locking order right | |
1700 | * for pin_fs | |
1701 | */ | |
1702 | inode_unlock(dir); | |
1703 | error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count); | |
feb3c766 | 1704 | mutex_lock_nested(&parent->lock, parent->level); |
4ae47f33 JJ |
1705 | inode_lock_nested(dir, I_MUTEX_PARENT); |
1706 | if (error) | |
1707 | goto out; | |
1708 | ||
1709 | error = __aafs_setup_d_inode(dir, dentry, mode | S_IFDIR, NULL, | |
1710 | NULL, NULL, NULL); | |
1711 | if (error) | |
1712 | goto out_pin; | |
1713 | ||
1714 | ns = __aa_find_or_create_ns(parent, READ_ONCE(dentry->d_name.name), | |
1715 | dentry); | |
1716 | if (IS_ERR(ns)) { | |
1717 | error = PTR_ERR(ns); | |
1718 | ns = NULL; | |
1719 | } | |
1720 | ||
1721 | aa_put_ns(ns); /* list ref remains */ | |
1722 | out_pin: | |
1723 | if (error) | |
1724 | simple_release_fs(&aafs_mnt, &aafs_count); | |
1725 | out: | |
1726 | mutex_unlock(&parent->lock); | |
1727 | aa_put_ns(parent); | |
1728 | ||
1729 | return error; | |
1730 | } | |
1731 | ||
1732 | static int ns_rmdir_op(struct inode *dir, struct dentry *dentry) | |
1733 | { | |
1734 | struct aa_ns *ns, *parent; | |
1735 | /* TODO: improve permission check */ | |
637f688d JJ |
1736 | struct aa_label *label; |
1737 | int error; | |
1738 | ||
1739 | label = begin_current_label_crit_section(); | |
1740 | error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY); | |
1741 | end_current_label_crit_section(label); | |
4ae47f33 JJ |
1742 | if (error) |
1743 | return error; | |
1744 | ||
566f52ec | 1745 | parent = aa_get_ns(dir->i_private); |
4ae47f33 JJ |
1746 | /* rmdir calls the generic securityfs functions to remove files |
1747 | * from the apparmor dir. It is up to the apparmor ns locking | |
1748 | * to avoid races. | |
1749 | */ | |
1750 | inode_unlock(dir); | |
1751 | inode_unlock(dentry->d_inode); | |
1752 | ||
feb3c766 | 1753 | mutex_lock_nested(&parent->lock, parent->level); |
4ae47f33 JJ |
1754 | ns = aa_get_ns(__aa_findn_ns(&parent->sub_ns, dentry->d_name.name, |
1755 | dentry->d_name.len)); | |
1756 | if (!ns) { | |
1757 | error = -ENOENT; | |
1758 | goto out; | |
1759 | } | |
1760 | AA_BUG(ns_dir(ns) != dentry); | |
1761 | ||
1762 | __aa_remove_ns(ns); | |
1763 | aa_put_ns(ns); | |
1764 | ||
1765 | out: | |
1766 | mutex_unlock(&parent->lock); | |
1767 | inode_lock_nested(dir, I_MUTEX_PARENT); | |
1768 | inode_lock(dentry->d_inode); | |
1769 | aa_put_ns(parent); | |
1770 | ||
1771 | return error; | |
1772 | } | |
1773 | ||
1774 | static const struct inode_operations ns_dir_inode_operations = { | |
1775 | .lookup = simple_lookup, | |
1776 | .mkdir = ns_mkdir_op, | |
1777 | .rmdir = ns_rmdir_op, | |
1778 | }; | |
1779 | ||
5d5182ca JJ |
1780 | static void __aa_fs_list_remove_rawdata(struct aa_ns *ns) |
1781 | { | |
1782 | struct aa_loaddata *ent, *tmp; | |
1783 | ||
1784 | AA_BUG(!mutex_is_locked(&ns->lock)); | |
1785 | ||
1786 | list_for_each_entry_safe(ent, tmp, &ns->rawdata_list, list) | |
1787 | __aa_fs_remove_rawdata(ent); | |
1788 | } | |
1789 | ||
c97204ba JJ |
1790 | /** |
1791 | * | |
1792 | * Requires: @ns->lock held | |
1793 | */ | |
1794 | void __aafs_ns_rmdir(struct aa_ns *ns) | |
0d259f04 | 1795 | { |
98849dff | 1796 | struct aa_ns *sub; |
0d259f04 JJ |
1797 | struct aa_profile *child; |
1798 | int i; | |
1799 | ||
1800 | if (!ns) | |
1801 | return; | |
cbf2d0e1 | 1802 | AA_BUG(!mutex_is_locked(&ns->lock)); |
0d259f04 JJ |
1803 | |
1804 | list_for_each_entry(child, &ns->base.profiles, base.list) | |
c97204ba | 1805 | __aafs_profile_rmdir(child); |
0d259f04 JJ |
1806 | |
1807 | list_for_each_entry(sub, &ns->sub_ns, base.list) { | |
feb3c766 | 1808 | mutex_lock_nested(&sub->lock, sub->level); |
c97204ba | 1809 | __aafs_ns_rmdir(sub); |
0d259f04 JJ |
1810 | mutex_unlock(&sub->lock); |
1811 | } | |
1812 | ||
5d5182ca JJ |
1813 | __aa_fs_list_remove_rawdata(ns); |
1814 | ||
b7fd2c03 JJ |
1815 | if (ns_subns_dir(ns)) { |
1816 | sub = d_inode(ns_subns_dir(ns))->i_private; | |
1817 | aa_put_ns(sub); | |
1818 | } | |
1819 | if (ns_subload(ns)) { | |
1820 | sub = d_inode(ns_subload(ns))->i_private; | |
1821 | aa_put_ns(sub); | |
1822 | } | |
1823 | if (ns_subreplace(ns)) { | |
1824 | sub = d_inode(ns_subreplace(ns))->i_private; | |
1825 | aa_put_ns(sub); | |
1826 | } | |
1827 | if (ns_subremove(ns)) { | |
1828 | sub = d_inode(ns_subremove(ns))->i_private; | |
1829 | aa_put_ns(sub); | |
1830 | } | |
d9bf2c26 JJ |
1831 | if (ns_subrevision(ns)) { |
1832 | sub = d_inode(ns_subrevision(ns))->i_private; | |
1833 | aa_put_ns(sub); | |
1834 | } | |
b7fd2c03 | 1835 | |
0d259f04 | 1836 | for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) { |
c961ee5f | 1837 | aafs_remove(ns->dents[i]); |
0d259f04 JJ |
1838 | ns->dents[i] = NULL; |
1839 | } | |
1840 | } | |
1841 | ||
b7fd2c03 | 1842 | /* assumes cleanup in caller */ |
c97204ba | 1843 | static int __aafs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir) |
b7fd2c03 JJ |
1844 | { |
1845 | struct dentry *dent; | |
1846 | ||
1847 | AA_BUG(!ns); | |
1848 | AA_BUG(!dir); | |
1849 | ||
c961ee5f | 1850 | dent = aafs_create_dir("profiles", dir); |
b7fd2c03 JJ |
1851 | if (IS_ERR(dent)) |
1852 | return PTR_ERR(dent); | |
1853 | ns_subprofs_dir(ns) = dent; | |
1854 | ||
c961ee5f | 1855 | dent = aafs_create_dir("raw_data", dir); |
b7fd2c03 JJ |
1856 | if (IS_ERR(dent)) |
1857 | return PTR_ERR(dent); | |
1858 | ns_subdata_dir(ns) = dent; | |
1859 | ||
d9bf2c26 JJ |
1860 | dent = aafs_create_file("revision", 0444, dir, ns, |
1861 | &aa_fs_ns_revision_fops); | |
1862 | if (IS_ERR(dent)) | |
1863 | return PTR_ERR(dent); | |
1864 | aa_get_ns(ns); | |
1865 | ns_subrevision(ns) = dent; | |
1866 | ||
c961ee5f | 1867 | dent = aafs_create_file(".load", 0640, dir, ns, |
b7fd2c03 JJ |
1868 | &aa_fs_profile_load); |
1869 | if (IS_ERR(dent)) | |
1870 | return PTR_ERR(dent); | |
1871 | aa_get_ns(ns); | |
1872 | ns_subload(ns) = dent; | |
1873 | ||
c961ee5f | 1874 | dent = aafs_create_file(".replace", 0640, dir, ns, |
b7fd2c03 JJ |
1875 | &aa_fs_profile_replace); |
1876 | if (IS_ERR(dent)) | |
1877 | return PTR_ERR(dent); | |
1878 | aa_get_ns(ns); | |
1879 | ns_subreplace(ns) = dent; | |
1880 | ||
c961ee5f | 1881 | dent = aafs_create_file(".remove", 0640, dir, ns, |
b7fd2c03 JJ |
1882 | &aa_fs_profile_remove); |
1883 | if (IS_ERR(dent)) | |
1884 | return PTR_ERR(dent); | |
1885 | aa_get_ns(ns); | |
1886 | ns_subremove(ns) = dent; | |
1887 | ||
4ae47f33 JJ |
1888 | /* use create_dentry so we can supply private data */ |
1889 | dent = aafs_create("namespaces", S_IFDIR | 0755, dir, ns, NULL, NULL, | |
1890 | &ns_dir_inode_operations); | |
b7fd2c03 JJ |
1891 | if (IS_ERR(dent)) |
1892 | return PTR_ERR(dent); | |
1893 | aa_get_ns(ns); | |
1894 | ns_subns_dir(ns) = dent; | |
1895 | ||
1896 | return 0; | |
1897 | } | |
1898 | ||
c97204ba JJ |
1899 | /* |
1900 | * Requires: @ns->lock held | |
1901 | */ | |
98407f0a JJ |
1902 | int __aafs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name, |
1903 | struct dentry *dent) | |
0d259f04 | 1904 | { |
98849dff | 1905 | struct aa_ns *sub; |
0d259f04 | 1906 | struct aa_profile *child; |
98407f0a | 1907 | struct dentry *dir; |
0d259f04 JJ |
1908 | int error; |
1909 | ||
b7fd2c03 JJ |
1910 | AA_BUG(!ns); |
1911 | AA_BUG(!parent); | |
1912 | AA_BUG(!mutex_is_locked(&ns->lock)); | |
1913 | ||
0d259f04 JJ |
1914 | if (!name) |
1915 | name = ns->base.name; | |
1916 | ||
c961ee5f JJ |
1917 | if (!dent) { |
1918 | /* create ns dir if it doesn't already exist */ | |
1919 | dent = aafs_create_dir(name, parent); | |
1920 | if (IS_ERR(dent)) | |
1921 | goto fail; | |
1922 | } else | |
1923 | dget(dent); | |
b7fd2c03 | 1924 | ns_dir(ns) = dir = dent; |
c97204ba | 1925 | error = __aafs_ns_mkdir_entries(ns, dir); |
b7fd2c03 JJ |
1926 | if (error) |
1927 | goto fail2; | |
0d259f04 | 1928 | |
b7fd2c03 | 1929 | /* profiles */ |
0d259f04 | 1930 | list_for_each_entry(child, &ns->base.profiles, base.list) { |
c97204ba | 1931 | error = __aafs_profile_mkdir(child, ns_subprofs_dir(ns)); |
0d259f04 JJ |
1932 | if (error) |
1933 | goto fail2; | |
1934 | } | |
1935 | ||
b7fd2c03 | 1936 | /* subnamespaces */ |
0d259f04 | 1937 | list_for_each_entry(sub, &ns->sub_ns, base.list) { |
feb3c766 | 1938 | mutex_lock_nested(&sub->lock, sub->level); |
98407f0a | 1939 | error = __aafs_ns_mkdir(sub, ns_subns_dir(ns), NULL, NULL); |
0d259f04 JJ |
1940 | mutex_unlock(&sub->lock); |
1941 | if (error) | |
1942 | goto fail2; | |
1943 | } | |
1944 | ||
1945 | return 0; | |
1946 | ||
1947 | fail: | |
1948 | error = PTR_ERR(dent); | |
1949 | ||
1950 | fail2: | |
c97204ba | 1951 | __aafs_ns_rmdir(ns); |
0d259f04 JJ |
1952 | |
1953 | return error; | |
1954 | } | |
1955 | ||
1956 | ||
29b3822f JJ |
1957 | #define list_entry_is_head(pos, head, member) (&pos->member == (head)) |
1958 | ||
1959 | /** | |
98849dff | 1960 | * __next_ns - find the next namespace to list |
29b3822f JJ |
1961 | * @root: root namespace to stop search at (NOT NULL) |
1962 | * @ns: current ns position (NOT NULL) | |
1963 | * | |
1964 | * Find the next namespace from @ns under @root and handle all locking needed | |
1965 | * while switching current namespace. | |
1966 | * | |
1967 | * Returns: next namespace or NULL if at last namespace under @root | |
1968 | * Requires: ns->parent->lock to be held | |
1969 | * NOTE: will not unlock root->lock | |
1970 | */ | |
98849dff | 1971 | static struct aa_ns *__next_ns(struct aa_ns *root, struct aa_ns *ns) |
29b3822f | 1972 | { |
98849dff | 1973 | struct aa_ns *parent, *next; |
29b3822f | 1974 | |
cbf2d0e1 JJ |
1975 | AA_BUG(!root); |
1976 | AA_BUG(!ns); | |
1977 | AA_BUG(ns != root && !mutex_is_locked(&ns->parent->lock)); | |
1978 | ||
29b3822f JJ |
1979 | /* is next namespace a child */ |
1980 | if (!list_empty(&ns->sub_ns)) { | |
1981 | next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list); | |
feb3c766 | 1982 | mutex_lock_nested(&next->lock, next->level); |
29b3822f JJ |
1983 | return next; |
1984 | } | |
1985 | ||
1986 | /* check if the next ns is a sibling, parent, gp, .. */ | |
1987 | parent = ns->parent; | |
ed2c7da3 | 1988 | while (ns != root) { |
29b3822f | 1989 | mutex_unlock(&ns->lock); |
38dbd7d8 | 1990 | next = list_next_entry(ns, base.list); |
29b3822f | 1991 | if (!list_entry_is_head(next, &parent->sub_ns, base.list)) { |
feb3c766 | 1992 | mutex_lock_nested(&next->lock, next->level); |
29b3822f JJ |
1993 | return next; |
1994 | } | |
29b3822f JJ |
1995 | ns = parent; |
1996 | parent = parent->parent; | |
1997 | } | |
1998 | ||
1999 | return NULL; | |
2000 | } | |
2001 | ||
2002 | /** | |
2003 | * __first_profile - find the first profile in a namespace | |
2004 | * @root: namespace that is root of profiles being displayed (NOT NULL) | |
2005 | * @ns: namespace to start in (NOT NULL) | |
2006 | * | |
2007 | * Returns: unrefcounted profile or NULL if no profile | |
2008 | * Requires: profile->ns.lock to be held | |
2009 | */ | |
98849dff JJ |
2010 | static struct aa_profile *__first_profile(struct aa_ns *root, |
2011 | struct aa_ns *ns) | |
29b3822f | 2012 | { |
cbf2d0e1 JJ |
2013 | AA_BUG(!root); |
2014 | AA_BUG(ns && !mutex_is_locked(&ns->lock)); | |
2015 | ||
98849dff | 2016 | for (; ns; ns = __next_ns(root, ns)) { |
29b3822f JJ |
2017 | if (!list_empty(&ns->base.profiles)) |
2018 | return list_first_entry(&ns->base.profiles, | |
2019 | struct aa_profile, base.list); | |
2020 | } | |
2021 | return NULL; | |
2022 | } | |
2023 | ||
2024 | /** | |
2025 | * __next_profile - step to the next profile in a profile tree | |
2026 | * @profile: current profile in tree (NOT NULL) | |
2027 | * | |
2028 | * Perform a depth first traversal on the profile tree in a namespace | |
2029 | * | |
2030 | * Returns: next profile or NULL if done | |
2031 | * Requires: profile->ns.lock to be held | |
2032 | */ | |
2033 | static struct aa_profile *__next_profile(struct aa_profile *p) | |
2034 | { | |
2035 | struct aa_profile *parent; | |
98849dff | 2036 | struct aa_ns *ns = p->ns; |
29b3822f | 2037 | |
cbf2d0e1 JJ |
2038 | AA_BUG(!mutex_is_locked(&profiles_ns(p)->lock)); |
2039 | ||
29b3822f JJ |
2040 | /* is next profile a child */ |
2041 | if (!list_empty(&p->base.profiles)) | |
2042 | return list_first_entry(&p->base.profiles, typeof(*p), | |
2043 | base.list); | |
2044 | ||
2045 | /* is next profile a sibling, parent sibling, gp, sibling, .. */ | |
2046 | parent = rcu_dereference_protected(p->parent, | |
2047 | mutex_is_locked(&p->ns->lock)); | |
2048 | while (parent) { | |
38dbd7d8 | 2049 | p = list_next_entry(p, base.list); |
29b3822f JJ |
2050 | if (!list_entry_is_head(p, &parent->base.profiles, base.list)) |
2051 | return p; | |
2052 | p = parent; | |
2053 | parent = rcu_dereference_protected(parent->parent, | |
2054 | mutex_is_locked(&parent->ns->lock)); | |
2055 | } | |
2056 | ||
2057 | /* is next another profile in the namespace */ | |
38dbd7d8 | 2058 | p = list_next_entry(p, base.list); |
29b3822f JJ |
2059 | if (!list_entry_is_head(p, &ns->base.profiles, base.list)) |
2060 | return p; | |
2061 | ||
2062 | return NULL; | |
2063 | } | |
2064 | ||
2065 | /** | |
2066 | * next_profile - step to the next profile in where ever it may be | |
2067 | * @root: root namespace (NOT NULL) | |
2068 | * @profile: current profile (NOT NULL) | |
2069 | * | |
2070 | * Returns: next profile or NULL if there isn't one | |
2071 | */ | |
98849dff | 2072 | static struct aa_profile *next_profile(struct aa_ns *root, |
29b3822f JJ |
2073 | struct aa_profile *profile) |
2074 | { | |
2075 | struct aa_profile *next = __next_profile(profile); | |
2076 | if (next) | |
2077 | return next; | |
2078 | ||
2079 | /* finished all profiles in namespace move to next namespace */ | |
98849dff | 2080 | return __first_profile(root, __next_ns(root, profile->ns)); |
29b3822f JJ |
2081 | } |
2082 | ||
2083 | /** | |
2084 | * p_start - start a depth first traversal of profile tree | |
2085 | * @f: seq_file to fill | |
2086 | * @pos: current position | |
2087 | * | |
2088 | * Returns: first profile under current namespace or NULL if none found | |
2089 | * | |
2090 | * acquires first ns->lock | |
2091 | */ | |
2092 | static void *p_start(struct seq_file *f, loff_t *pos) | |
2093 | { | |
2094 | struct aa_profile *profile = NULL; | |
cf797c0e | 2095 | struct aa_ns *root = aa_get_current_ns(); |
29b3822f | 2096 | loff_t l = *pos; |
cf797c0e | 2097 | f->private = root; |
29b3822f JJ |
2098 | |
2099 | /* find the first profile */ | |
feb3c766 | 2100 | mutex_lock_nested(&root->lock, root->level); |
29b3822f JJ |
2101 | profile = __first_profile(root, root); |
2102 | ||
2103 | /* skip to position */ | |
2104 | for (; profile && l > 0; l--) | |
2105 | profile = next_profile(root, profile); | |
2106 | ||
2107 | return profile; | |
2108 | } | |
2109 | ||
2110 | /** | |
2111 | * p_next - read the next profile entry | |
2112 | * @f: seq_file to fill | |
2113 | * @p: profile previously returned | |
2114 | * @pos: current position | |
2115 | * | |
2116 | * Returns: next profile after @p or NULL if none | |
2117 | * | |
2118 | * may acquire/release locks in namespace tree as necessary | |
2119 | */ | |
2120 | static void *p_next(struct seq_file *f, void *p, loff_t *pos) | |
2121 | { | |
2122 | struct aa_profile *profile = p; | |
98849dff | 2123 | struct aa_ns *ns = f->private; |
29b3822f JJ |
2124 | (*pos)++; |
2125 | ||
2126 | return next_profile(ns, profile); | |
2127 | } | |
2128 | ||
2129 | /** | |
2130 | * p_stop - stop depth first traversal | |
2131 | * @f: seq_file we are filling | |
2132 | * @p: the last profile writen | |
2133 | * | |
2134 | * Release all locking done by p_start/p_next on namespace tree | |
2135 | */ | |
2136 | static void p_stop(struct seq_file *f, void *p) | |
2137 | { | |
2138 | struct aa_profile *profile = p; | |
98849dff | 2139 | struct aa_ns *root = f->private, *ns; |
29b3822f JJ |
2140 | |
2141 | if (profile) { | |
2142 | for (ns = profile->ns; ns && ns != root; ns = ns->parent) | |
2143 | mutex_unlock(&ns->lock); | |
2144 | } | |
2145 | mutex_unlock(&root->lock); | |
98849dff | 2146 | aa_put_ns(root); |
29b3822f JJ |
2147 | } |
2148 | ||
2149 | /** | |
2150 | * seq_show_profile - show a profile entry | |
2151 | * @f: seq_file to file | |
2152 | * @p: current position (profile) (NOT NULL) | |
2153 | * | |
2154 | * Returns: error on failure | |
2155 | */ | |
2156 | static int seq_show_profile(struct seq_file *f, void *p) | |
2157 | { | |
2158 | struct aa_profile *profile = (struct aa_profile *)p; | |
98849dff | 2159 | struct aa_ns *root = f->private; |
29b3822f | 2160 | |
637f688d JJ |
2161 | aa_label_seq_xprint(f, root, &profile->label, |
2162 | FLAG_SHOW_MODE | FLAG_VIEW_SUBNS, GFP_KERNEL); | |
2163 | seq_putc(f, '\n'); | |
29b3822f JJ |
2164 | |
2165 | return 0; | |
2166 | } | |
2167 | ||
c97204ba | 2168 | static const struct seq_operations aa_sfs_profiles_op = { |
29b3822f JJ |
2169 | .start = p_start, |
2170 | .next = p_next, | |
2171 | .stop = p_stop, | |
2172 | .show = seq_show_profile, | |
2173 | }; | |
2174 | ||
2175 | static int profiles_open(struct inode *inode, struct file *file) | |
2176 | { | |
5ac8c355 JJ |
2177 | if (!policy_view_capable(NULL)) |
2178 | return -EACCES; | |
2179 | ||
c97204ba | 2180 | return seq_open(file, &aa_sfs_profiles_op); |
29b3822f JJ |
2181 | } |
2182 | ||
2183 | static int profiles_release(struct inode *inode, struct file *file) | |
2184 | { | |
2185 | return seq_release(inode, file); | |
2186 | } | |
2187 | ||
c97204ba | 2188 | static const struct file_operations aa_sfs_profiles_fops = { |
29b3822f JJ |
2189 | .open = profiles_open, |
2190 | .read = seq_read, | |
2191 | .llseek = seq_lseek, | |
2192 | .release = profiles_release, | |
2193 | }; | |
2194 | ||
2195 | ||
0d259f04 | 2196 | /** Base file system setup **/ |
c97204ba JJ |
2197 | static struct aa_sfs_entry aa_sfs_entry_file[] = { |
2198 | AA_SFS_FILE_STRING("mask", | |
2199 | "create read write exec append mmap_exec link lock"), | |
a9bf8e9f KC |
2200 | { } |
2201 | }; | |
2202 | ||
290f458a JJ |
2203 | static struct aa_sfs_entry aa_sfs_entry_ptrace[] = { |
2204 | AA_SFS_FILE_STRING("mask", "read trace"), | |
2205 | { } | |
2206 | }; | |
2207 | ||
cd1dbf76 JJ |
2208 | static struct aa_sfs_entry aa_sfs_entry_signal[] = { |
2209 | AA_SFS_FILE_STRING("mask", AA_SFS_SIG_MASK), | |
2210 | { } | |
2211 | }; | |
2212 | ||
73f488cd JJ |
2213 | static struct aa_sfs_entry aa_sfs_entry_attach[] = { |
2214 | AA_SFS_FILE_BOOLEAN("xattr", 1), | |
2215 | { } | |
2216 | }; | |
c97204ba JJ |
2217 | static struct aa_sfs_entry aa_sfs_entry_domain[] = { |
2218 | AA_SFS_FILE_BOOLEAN("change_hat", 1), | |
2219 | AA_SFS_FILE_BOOLEAN("change_hatv", 1), | |
2220 | AA_SFS_FILE_BOOLEAN("change_onexec", 1), | |
2221 | AA_SFS_FILE_BOOLEAN("change_profile", 1), | |
6c5fc8f1 | 2222 | AA_SFS_FILE_BOOLEAN("stack", 1), |
c97204ba | 2223 | AA_SFS_FILE_BOOLEAN("fix_binfmt_elf_mmap", 1), |
9fcf78cc | 2224 | AA_SFS_FILE_BOOLEAN("post_nnp_subset", 1), |
21f60661 | 2225 | AA_SFS_FILE_BOOLEAN("computed_longest_left", 1), |
73f488cd | 2226 | AA_SFS_DIR("attach_conditions", aa_sfs_entry_attach), |
c97204ba | 2227 | AA_SFS_FILE_STRING("version", "1.2"), |
e74abcf3 KC |
2228 | { } |
2229 | }; | |
2230 | ||
c97204ba JJ |
2231 | static struct aa_sfs_entry aa_sfs_entry_versions[] = { |
2232 | AA_SFS_FILE_BOOLEAN("v5", 1), | |
5379a331 JJ |
2233 | AA_SFS_FILE_BOOLEAN("v6", 1), |
2234 | AA_SFS_FILE_BOOLEAN("v7", 1), | |
56974a6f | 2235 | AA_SFS_FILE_BOOLEAN("v8", 1), |
474d6b75 JJ |
2236 | { } |
2237 | }; | |
2238 | ||
c97204ba JJ |
2239 | static struct aa_sfs_entry aa_sfs_entry_policy[] = { |
2240 | AA_SFS_DIR("versions", aa_sfs_entry_versions), | |
2241 | AA_SFS_FILE_BOOLEAN("set_load", 1), | |
474d6b75 | 2242 | { } |
9d910a3b JJ |
2243 | }; |
2244 | ||
2ea3ffb7 JJ |
2245 | static struct aa_sfs_entry aa_sfs_entry_mount[] = { |
2246 | AA_SFS_FILE_STRING("mask", "mount umount pivot_root"), | |
2247 | { } | |
2248 | }; | |
2249 | ||
33f2eada JJ |
2250 | static struct aa_sfs_entry aa_sfs_entry_ns[] = { |
2251 | AA_SFS_FILE_BOOLEAN("profile", 1), | |
2ea3ffb7 | 2252 | AA_SFS_FILE_BOOLEAN("pivot_root", 0), |
33f2eada JJ |
2253 | { } |
2254 | }; | |
2255 | ||
a83bd86e | 2256 | static struct aa_sfs_entry aa_sfs_entry_query_label[] = { |
4f3b3f2d | 2257 | AA_SFS_FILE_STRING("perms", "allow deny audit quiet"), |
a83bd86e | 2258 | AA_SFS_FILE_BOOLEAN("data", 1), |
1dea3b41 | 2259 | AA_SFS_FILE_BOOLEAN("multi_transaction", 1), |
a83bd86e JJ |
2260 | { } |
2261 | }; | |
2262 | ||
2263 | static struct aa_sfs_entry aa_sfs_entry_query[] = { | |
2264 | AA_SFS_DIR("label", aa_sfs_entry_query_label), | |
2265 | { } | |
2266 | }; | |
c97204ba JJ |
2267 | static struct aa_sfs_entry aa_sfs_entry_features[] = { |
2268 | AA_SFS_DIR("policy", aa_sfs_entry_policy), | |
2269 | AA_SFS_DIR("domain", aa_sfs_entry_domain), | |
2270 | AA_SFS_DIR("file", aa_sfs_entry_file), | |
56974a6f | 2271 | AA_SFS_DIR("network_v8", aa_sfs_entry_network), |
2ea3ffb7 | 2272 | AA_SFS_DIR("mount", aa_sfs_entry_mount), |
33f2eada | 2273 | AA_SFS_DIR("namespaces", aa_sfs_entry_ns), |
c97204ba JJ |
2274 | AA_SFS_FILE_U64("capability", VFS_CAP_FLAGS_MASK), |
2275 | AA_SFS_DIR("rlimit", aa_sfs_entry_rlimit), | |
2276 | AA_SFS_DIR("caps", aa_sfs_entry_caps), | |
290f458a | 2277 | AA_SFS_DIR("ptrace", aa_sfs_entry_ptrace), |
cd1dbf76 | 2278 | AA_SFS_DIR("signal", aa_sfs_entry_signal), |
a83bd86e | 2279 | AA_SFS_DIR("query", aa_sfs_entry_query), |
e74abcf3 KC |
2280 | { } |
2281 | }; | |
2282 | ||
c97204ba | 2283 | static struct aa_sfs_entry aa_sfs_entry_apparmor[] = { |
bf81100f | 2284 | AA_SFS_FILE_FOPS(".access", 0666, &aa_sfs_access), |
6c5fc8f1 JJ |
2285 | AA_SFS_FILE_FOPS(".stacked", 0444, &seq_ns_stacked_fops), |
2286 | AA_SFS_FILE_FOPS(".ns_stacked", 0444, &seq_ns_nsstacked_fops), | |
bf81100f JJ |
2287 | AA_SFS_FILE_FOPS(".ns_level", 0444, &seq_ns_level_fops), |
2288 | AA_SFS_FILE_FOPS(".ns_name", 0444, &seq_ns_name_fops), | |
2289 | AA_SFS_FILE_FOPS("profiles", 0444, &aa_sfs_profiles_fops), | |
c97204ba | 2290 | AA_SFS_DIR("features", aa_sfs_entry_features), |
9acd494b KC |
2291 | { } |
2292 | }; | |
63e2b423 | 2293 | |
c97204ba JJ |
2294 | static struct aa_sfs_entry aa_sfs_entry = |
2295 | AA_SFS_DIR("apparmor", aa_sfs_entry_apparmor); | |
63e2b423 | 2296 | |
9acd494b | 2297 | /** |
a481f4d9 | 2298 | * entry_create_file - create a file entry in the apparmor securityfs |
c97204ba | 2299 | * @fs_file: aa_sfs_entry to build an entry for (NOT NULL) |
9acd494b KC |
2300 | * @parent: the parent dentry in the securityfs |
2301 | * | |
a481f4d9 | 2302 | * Use entry_remove_file to remove entries created with this fn. |
9acd494b | 2303 | */ |
c97204ba | 2304 | static int __init entry_create_file(struct aa_sfs_entry *fs_file, |
a481f4d9 | 2305 | struct dentry *parent) |
9acd494b KC |
2306 | { |
2307 | int error = 0; | |
2308 | ||
2309 | fs_file->dentry = securityfs_create_file(fs_file->name, | |
2310 | S_IFREG | fs_file->mode, | |
2311 | parent, fs_file, | |
2312 | fs_file->file_ops); | |
2313 | if (IS_ERR(fs_file->dentry)) { | |
2314 | error = PTR_ERR(fs_file->dentry); | |
2315 | fs_file->dentry = NULL; | |
63e2b423 | 2316 | } |
9acd494b | 2317 | return error; |
63e2b423 JJ |
2318 | } |
2319 | ||
c97204ba | 2320 | static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir); |
63e2b423 | 2321 | /** |
a481f4d9 | 2322 | * entry_create_dir - recursively create a directory entry in the securityfs |
c97204ba | 2323 | * @fs_dir: aa_sfs_entry (and all child entries) to build (NOT NULL) |
9acd494b | 2324 | * @parent: the parent dentry in the securityfs |
63e2b423 | 2325 | * |
a481f4d9 | 2326 | * Use entry_remove_dir to remove entries created with this fn. |
63e2b423 | 2327 | */ |
c97204ba JJ |
2328 | static int __init entry_create_dir(struct aa_sfs_entry *fs_dir, |
2329 | struct dentry *parent) | |
63e2b423 | 2330 | { |
c97204ba | 2331 | struct aa_sfs_entry *fs_file; |
0d259f04 JJ |
2332 | struct dentry *dir; |
2333 | int error; | |
63e2b423 | 2334 | |
0d259f04 JJ |
2335 | dir = securityfs_create_dir(fs_dir->name, parent); |
2336 | if (IS_ERR(dir)) | |
2337 | return PTR_ERR(dir); | |
2338 | fs_dir->dentry = dir; | |
63e2b423 | 2339 | |
0d259f04 | 2340 | for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) { |
c97204ba | 2341 | if (fs_file->v_type == AA_SFS_TYPE_DIR) |
a481f4d9 | 2342 | error = entry_create_dir(fs_file, fs_dir->dentry); |
9acd494b | 2343 | else |
a481f4d9 | 2344 | error = entry_create_file(fs_file, fs_dir->dentry); |
9acd494b KC |
2345 | if (error) |
2346 | goto failed; | |
2347 | } | |
2348 | ||
2349 | return 0; | |
2350 | ||
2351 | failed: | |
a481f4d9 | 2352 | entry_remove_dir(fs_dir); |
0d259f04 | 2353 | |
9acd494b KC |
2354 | return error; |
2355 | } | |
2356 | ||
2357 | /** | |
c97204ba JJ |
2358 | * entry_remove_file - drop a single file entry in the apparmor securityfs |
2359 | * @fs_file: aa_sfs_entry to detach from the securityfs (NOT NULL) | |
9acd494b | 2360 | */ |
c97204ba | 2361 | static void __init entry_remove_file(struct aa_sfs_entry *fs_file) |
9acd494b KC |
2362 | { |
2363 | if (!fs_file->dentry) | |
2364 | return; | |
2365 | ||
2366 | securityfs_remove(fs_file->dentry); | |
2367 | fs_file->dentry = NULL; | |
2368 | } | |
2369 | ||
2370 | /** | |
a481f4d9 | 2371 | * entry_remove_dir - recursively drop a directory entry from the securityfs |
c97204ba | 2372 | * @fs_dir: aa_sfs_entry (and all child entries) to detach (NOT NULL) |
9acd494b | 2373 | */ |
c97204ba | 2374 | static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir) |
9acd494b | 2375 | { |
c97204ba | 2376 | struct aa_sfs_entry *fs_file; |
9acd494b | 2377 | |
0d259f04 | 2378 | for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) { |
c97204ba | 2379 | if (fs_file->v_type == AA_SFS_TYPE_DIR) |
a481f4d9 | 2380 | entry_remove_dir(fs_file); |
9acd494b | 2381 | else |
c97204ba | 2382 | entry_remove_file(fs_file); |
9acd494b KC |
2383 | } |
2384 | ||
c97204ba | 2385 | entry_remove_file(fs_dir); |
63e2b423 JJ |
2386 | } |
2387 | ||
2388 | /** | |
2389 | * aa_destroy_aafs - cleanup and free aafs | |
2390 | * | |
2391 | * releases dentries allocated by aa_create_aafs | |
2392 | */ | |
2393 | void __init aa_destroy_aafs(void) | |
2394 | { | |
c97204ba | 2395 | entry_remove_dir(&aa_sfs_entry); |
63e2b423 JJ |
2396 | } |
2397 | ||
a71ada30 JJ |
2398 | |
2399 | #define NULL_FILE_NAME ".null" | |
2400 | struct path aa_null; | |
2401 | ||
2402 | static int aa_mk_null_file(struct dentry *parent) | |
2403 | { | |
2404 | struct vfsmount *mount = NULL; | |
2405 | struct dentry *dentry; | |
2406 | struct inode *inode; | |
2407 | int count = 0; | |
2408 | int error = simple_pin_fs(parent->d_sb->s_type, &mount, &count); | |
2409 | ||
2410 | if (error) | |
2411 | return error; | |
2412 | ||
2413 | inode_lock(d_inode(parent)); | |
2414 | dentry = lookup_one_len(NULL_FILE_NAME, parent, strlen(NULL_FILE_NAME)); | |
2415 | if (IS_ERR(dentry)) { | |
2416 | error = PTR_ERR(dentry); | |
2417 | goto out; | |
2418 | } | |
2419 | inode = new_inode(parent->d_inode->i_sb); | |
2420 | if (!inode) { | |
2421 | error = -ENOMEM; | |
2422 | goto out1; | |
2423 | } | |
2424 | ||
2425 | inode->i_ino = get_next_ino(); | |
2426 | inode->i_mode = S_IFCHR | S_IRUGO | S_IWUGO; | |
24d0d03c | 2427 | inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
a71ada30 JJ |
2428 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, |
2429 | MKDEV(MEM_MAJOR, 3)); | |
2430 | d_instantiate(dentry, inode); | |
2431 | aa_null.dentry = dget(dentry); | |
2432 | aa_null.mnt = mntget(mount); | |
2433 | ||
2434 | error = 0; | |
2435 | ||
2436 | out1: | |
2437 | dput(dentry); | |
2438 | out: | |
2439 | inode_unlock(d_inode(parent)); | |
2440 | simple_release_fs(&mount, &count); | |
2441 | return error; | |
2442 | } | |
2443 | ||
a481f4d9 JJ |
2444 | |
2445 | ||
2446 | static const char *policy_get_link(struct dentry *dentry, | |
2447 | struct inode *inode, | |
2448 | struct delayed_call *done) | |
2449 | { | |
2450 | struct aa_ns *ns; | |
2451 | struct path path; | |
2452 | ||
2453 | if (!dentry) | |
2454 | return ERR_PTR(-ECHILD); | |
2455 | ns = aa_get_current_ns(); | |
2456 | path.mnt = mntget(aafs_mnt); | |
2457 | path.dentry = dget(ns_dir(ns)); | |
2458 | nd_jump_link(&path); | |
2459 | aa_put_ns(ns); | |
2460 | ||
2461 | return NULL; | |
2462 | } | |
2463 | ||
a481f4d9 JJ |
2464 | static int policy_readlink(struct dentry *dentry, char __user *buffer, |
2465 | int buflen) | |
2466 | { | |
a481f4d9 JJ |
2467 | char name[32]; |
2468 | int res; | |
2469 | ||
a0781209 JJ |
2470 | res = snprintf(name, sizeof(name), "%s:[%lu]", AAFS_NAME, |
2471 | d_inode(dentry)->i_ino); | |
2472 | if (res > 0 && res < sizeof(name)) | |
a481f4d9 | 2473 | res = readlink_copy(buffer, buflen, name); |
a0781209 JJ |
2474 | else |
2475 | res = -ENOENT; | |
a481f4d9 JJ |
2476 | |
2477 | return res; | |
2478 | } | |
2479 | ||
2480 | static const struct inode_operations policy_link_iops = { | |
2481 | .readlink = policy_readlink, | |
2482 | .get_link = policy_get_link, | |
2483 | }; | |
2484 | ||
2485 | ||
63e2b423 JJ |
2486 | /** |
2487 | * aa_create_aafs - create the apparmor security filesystem | |
2488 | * | |
2489 | * dentries created here are released by aa_destroy_aafs | |
2490 | * | |
2491 | * Returns: error on failure | |
2492 | */ | |
3417d8d5 | 2493 | static int __init aa_create_aafs(void) |
63e2b423 | 2494 | { |
b7fd2c03 | 2495 | struct dentry *dent; |
63e2b423 JJ |
2496 | int error; |
2497 | ||
2498 | if (!apparmor_initialized) | |
2499 | return 0; | |
2500 | ||
c97204ba | 2501 | if (aa_sfs_entry.dentry) { |
63e2b423 JJ |
2502 | AA_ERROR("%s: AppArmor securityfs already exists\n", __func__); |
2503 | return -EEXIST; | |
2504 | } | |
2505 | ||
a481f4d9 JJ |
2506 | /* setup apparmorfs used to virtualize policy/ */ |
2507 | aafs_mnt = kern_mount(&aafs_ops); | |
2508 | if (IS_ERR(aafs_mnt)) | |
2509 | panic("can't set apparmorfs up\n"); | |
1751e8a6 | 2510 | aafs_mnt->mnt_sb->s_flags &= ~SB_NOUSER; |
a481f4d9 | 2511 | |
9acd494b | 2512 | /* Populate fs tree. */ |
c97204ba | 2513 | error = entry_create_dir(&aa_sfs_entry, NULL); |
63e2b423 JJ |
2514 | if (error) |
2515 | goto error; | |
2516 | ||
c97204ba | 2517 | dent = securityfs_create_file(".load", 0666, aa_sfs_entry.dentry, |
b7fd2c03 | 2518 | NULL, &aa_fs_profile_load); |
cf916000 JJ |
2519 | if (IS_ERR(dent)) |
2520 | goto dent_error; | |
b7fd2c03 JJ |
2521 | ns_subload(root_ns) = dent; |
2522 | ||
c97204ba | 2523 | dent = securityfs_create_file(".replace", 0666, aa_sfs_entry.dentry, |
b7fd2c03 | 2524 | NULL, &aa_fs_profile_replace); |
cf916000 JJ |
2525 | if (IS_ERR(dent)) |
2526 | goto dent_error; | |
b7fd2c03 JJ |
2527 | ns_subreplace(root_ns) = dent; |
2528 | ||
c97204ba | 2529 | dent = securityfs_create_file(".remove", 0666, aa_sfs_entry.dentry, |
b7fd2c03 | 2530 | NULL, &aa_fs_profile_remove); |
cf916000 JJ |
2531 | if (IS_ERR(dent)) |
2532 | goto dent_error; | |
b7fd2c03 JJ |
2533 | ns_subremove(root_ns) = dent; |
2534 | ||
d9bf2c26 JJ |
2535 | dent = securityfs_create_file("revision", 0444, aa_sfs_entry.dentry, |
2536 | NULL, &aa_fs_ns_revision_fops); | |
cf916000 JJ |
2537 | if (IS_ERR(dent)) |
2538 | goto dent_error; | |
d9bf2c26 JJ |
2539 | ns_subrevision(root_ns) = dent; |
2540 | ||
2541 | /* policy tree referenced by magic policy symlink */ | |
feb3c766 | 2542 | mutex_lock_nested(&root_ns->lock, root_ns->level); |
c961ee5f JJ |
2543 | error = __aafs_ns_mkdir(root_ns, aafs_mnt->mnt_root, ".policy", |
2544 | aafs_mnt->mnt_root); | |
b7fd2c03 | 2545 | mutex_unlock(&root_ns->lock); |
0d259f04 JJ |
2546 | if (error) |
2547 | goto error; | |
2548 | ||
c961ee5f JJ |
2549 | /* magic symlink similar to nsfs redirects based on task policy */ |
2550 | dent = securityfs_create_symlink("policy", aa_sfs_entry.dentry, | |
2551 | NULL, &policy_link_iops); | |
cf916000 JJ |
2552 | if (IS_ERR(dent)) |
2553 | goto dent_error; | |
c961ee5f | 2554 | |
c97204ba | 2555 | error = aa_mk_null_file(aa_sfs_entry.dentry); |
a71ada30 JJ |
2556 | if (error) |
2557 | goto error; | |
2558 | ||
2559 | /* TODO: add default profile to apparmorfs */ | |
63e2b423 JJ |
2560 | |
2561 | /* Report that AppArmor fs is enabled */ | |
2562 | aa_info_message("AppArmor Filesystem Enabled"); | |
2563 | return 0; | |
2564 | ||
cf916000 JJ |
2565 | dent_error: |
2566 | error = PTR_ERR(dent); | |
63e2b423 JJ |
2567 | error: |
2568 | aa_destroy_aafs(); | |
2569 | AA_ERROR("Error creating AppArmor securityfs\n"); | |
2570 | return error; | |
2571 | } | |
2572 | ||
2573 | fs_initcall(aa_create_aafs); |