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63e2b423 JJ |
1 | /* |
2 | * AppArmor security module | |
3 | * | |
4 | * This file contains AppArmor /sys/kernel/security/apparmor interface functions | |
5 | * | |
6 | * Copyright (C) 1998-2008 Novell/SUSE | |
7 | * Copyright 2009-2010 Canonical Ltd. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License as | |
11 | * published by the Free Software Foundation, version 2 of the | |
12 | * License. | |
13 | */ | |
14 | ||
0d259f04 | 15 | #include <linux/ctype.h> |
63e2b423 JJ |
16 | #include <linux/security.h> |
17 | #include <linux/vmalloc.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/seq_file.h> | |
20 | #include <linux/uaccess.h> | |
a71ada30 | 21 | #include <linux/mount.h> |
63e2b423 | 22 | #include <linux/namei.h> |
e74abcf3 | 23 | #include <linux/capability.h> |
29b3822f | 24 | #include <linux/rcupdate.h> |
a71ada30 | 25 | #include <linux/fs.h> |
d9bf2c26 | 26 | #include <linux/poll.h> |
a481f4d9 JJ |
27 | #include <uapi/linux/major.h> |
28 | #include <uapi/linux/magic.h> | |
63e2b423 JJ |
29 | |
30 | #include "include/apparmor.h" | |
31 | #include "include/apparmorfs.h" | |
32 | #include "include/audit.h" | |
33 | #include "include/context.h" | |
f8eb8a13 | 34 | #include "include/crypto.h" |
d9bf2c26 | 35 | #include "include/policy_ns.h" |
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 | { | |
122 | struct inode *inode = d_inode(dentry); | |
123 | ||
124 | seq_printf(seq, "%s:[%lu]", AAFS_NAME, inode->i_ino); | |
125 | return 0; | |
126 | } | |
127 | ||
128 | static void aafs_evict_inode(struct inode *inode) | |
129 | { | |
130 | truncate_inode_pages_final(&inode->i_data); | |
131 | clear_inode(inode); | |
132 | if (S_ISLNK(inode->i_mode)) | |
133 | kfree(inode->i_link); | |
134 | } | |
135 | ||
136 | static const struct super_operations aafs_super_ops = { | |
137 | .statfs = simple_statfs, | |
138 | .evict_inode = aafs_evict_inode, | |
139 | .show_path = aafs_show_path, | |
140 | }; | |
141 | ||
142 | static int fill_super(struct super_block *sb, void *data, int silent) | |
143 | { | |
144 | static struct tree_descr files[] = { {""} }; | |
145 | int error; | |
146 | ||
147 | error = simple_fill_super(sb, AAFS_MAGIC, files); | |
148 | if (error) | |
149 | return error; | |
150 | sb->s_op = &aafs_super_ops; | |
151 | ||
152 | return 0; | |
153 | } | |
154 | ||
155 | static struct dentry *aafs_mount(struct file_system_type *fs_type, | |
156 | int flags, const char *dev_name, void *data) | |
157 | { | |
158 | return mount_single(fs_type, flags, data, fill_super); | |
159 | } | |
160 | ||
161 | static struct file_system_type aafs_ops = { | |
162 | .owner = THIS_MODULE, | |
163 | .name = AAFS_NAME, | |
164 | .mount = aafs_mount, | |
165 | .kill_sb = kill_anon_super, | |
166 | }; | |
167 | ||
168 | /** | |
169 | * __aafs_setup_d_inode - basic inode setup for apparmorfs | |
170 | * @dir: parent directory for the dentry | |
171 | * @dentry: dentry we are seting the inode up for | |
172 | * @mode: permissions the file should have | |
173 | * @data: data to store on inode.i_private, available in open() | |
174 | * @link: if symlink, symlink target string | |
175 | * @fops: struct file_operations that should be used | |
176 | * @iops: struct of inode_operations that should be used | |
177 | */ | |
178 | static int __aafs_setup_d_inode(struct inode *dir, struct dentry *dentry, | |
179 | umode_t mode, void *data, char *link, | |
180 | const struct file_operations *fops, | |
181 | const struct inode_operations *iops) | |
182 | { | |
183 | struct inode *inode = new_inode(dir->i_sb); | |
184 | ||
185 | AA_BUG(!dir); | |
186 | AA_BUG(!dentry); | |
187 | ||
188 | if (!inode) | |
189 | return -ENOMEM; | |
190 | ||
191 | inode->i_ino = get_next_ino(); | |
192 | inode->i_mode = mode; | |
193 | inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); | |
194 | inode->i_private = data; | |
195 | if (S_ISDIR(mode)) { | |
196 | inode->i_op = iops ? iops : &simple_dir_inode_operations; | |
197 | inode->i_fop = &simple_dir_operations; | |
198 | inc_nlink(inode); | |
199 | inc_nlink(dir); | |
200 | } else if (S_ISLNK(mode)) { | |
201 | inode->i_op = iops ? iops : &simple_symlink_inode_operations; | |
202 | inode->i_link = link; | |
203 | } else { | |
204 | inode->i_fop = fops; | |
205 | } | |
206 | d_instantiate(dentry, inode); | |
207 | dget(dentry); | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | /** | |
213 | * aafs_create - create a dentry in the apparmorfs filesystem | |
214 | * | |
215 | * @name: name of dentry to create | |
216 | * @mode: permissions the file should have | |
217 | * @parent: parent directory for this dentry | |
218 | * @data: data to store on inode.i_private, available in open() | |
219 | * @link: if symlink, symlink target string | |
220 | * @fops: struct file_operations that should be used for | |
221 | * @iops: struct of inode_operations that should be used | |
222 | * | |
223 | * This is the basic "create a xxx" function for apparmorfs. | |
224 | * | |
225 | * Returns a pointer to a dentry if it succeeds, that must be free with | |
226 | * aafs_remove(). Will return ERR_PTR on failure. | |
227 | */ | |
228 | static struct dentry *aafs_create(const char *name, umode_t mode, | |
229 | struct dentry *parent, void *data, void *link, | |
230 | const struct file_operations *fops, | |
231 | const struct inode_operations *iops) | |
232 | { | |
233 | struct dentry *dentry; | |
234 | struct inode *dir; | |
235 | int error; | |
236 | ||
237 | AA_BUG(!name); | |
238 | AA_BUG(!parent); | |
239 | ||
240 | if (!(mode & S_IFMT)) | |
241 | mode = (mode & S_IALLUGO) | S_IFREG; | |
242 | ||
243 | error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count); | |
244 | if (error) | |
245 | return ERR_PTR(error); | |
246 | ||
247 | dir = d_inode(parent); | |
248 | ||
249 | inode_lock(dir); | |
250 | dentry = lookup_one_len(name, parent, strlen(name)); | |
251 | if (IS_ERR(dentry)) | |
252 | goto fail_lock; | |
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 | |
313 | * @iops: struct of inode_operations that should be used | |
314 | * | |
315 | * If @target parameter is %NULL, then the @iops parameter needs to be | |
316 | * setup to handle .readlink and .get_link inode_operations. | |
317 | */ | |
318 | static struct dentry *aafs_create_symlink(const char *name, | |
319 | struct dentry *parent, | |
320 | const char *target, | |
321 | const struct inode_operations *iops) | |
322 | { | |
323 | struct dentry *dent; | |
324 | char *link = NULL; | |
325 | ||
326 | if (target) { | |
327 | link = kstrdup(target, GFP_KERNEL); | |
328 | if (!link) | |
329 | return ERR_PTR(-ENOMEM); | |
330 | } | |
331 | dent = aafs_create(name, S_IFLNK | 0444, parent, NULL, link, NULL, | |
332 | iops); | |
333 | if (IS_ERR(dent)) | |
334 | kfree(link); | |
335 | ||
336 | return dent; | |
337 | } | |
338 | ||
339 | /** | |
340 | * aafs_remove - removes a file or directory from the apparmorfs filesystem | |
341 | * | |
342 | * @dentry: dentry of the file/directory/symlink to removed. | |
343 | */ | |
344 | static void aafs_remove(struct dentry *dentry) | |
345 | { | |
346 | struct inode *dir; | |
347 | ||
348 | if (!dentry || IS_ERR(dentry)) | |
349 | return; | |
350 | ||
351 | dir = d_inode(dentry->d_parent); | |
352 | inode_lock(dir); | |
353 | if (simple_positive(dentry)) { | |
354 | if (d_is_dir(dentry)) | |
355 | simple_rmdir(dir, dentry); | |
356 | else | |
357 | simple_unlink(dir, dentry); | |
358 | dput(dentry); | |
359 | } | |
360 | inode_unlock(dir); | |
361 | simple_release_fs(&aafs_mnt, &aafs_count); | |
362 | } | |
363 | ||
364 | ||
365 | /* | |
366 | * aa_fs - policy load/replace/remove | |
367 | */ | |
368 | ||
63e2b423 JJ |
369 | /** |
370 | * aa_simple_write_to_buffer - common routine for getting policy from user | |
63e2b423 | 371 | * @userbuf: user buffer to copy data from (NOT NULL) |
3ed02ada | 372 | * @alloc_size: size of user buffer (REQUIRES: @alloc_size >= @copy_size) |
63e2b423 JJ |
373 | * @copy_size: size of data to copy from user buffer |
374 | * @pos: position write is at in the file (NOT NULL) | |
375 | * | |
376 | * Returns: kernel buffer containing copy of user buffer data or an | |
377 | * ERR_PTR on failure. | |
378 | */ | |
5ef50d01 | 379 | static struct aa_loaddata *aa_simple_write_to_buffer(const char __user *userbuf, |
5ac8c355 JJ |
380 | size_t alloc_size, |
381 | size_t copy_size, | |
382 | loff_t *pos) | |
63e2b423 | 383 | { |
5ac8c355 | 384 | struct aa_loaddata *data; |
63e2b423 | 385 | |
e6bfa25d | 386 | AA_BUG(copy_size > alloc_size); |
3ed02ada | 387 | |
63e2b423 JJ |
388 | if (*pos != 0) |
389 | /* only writes from pos 0, that is complete writes */ | |
390 | return ERR_PTR(-ESPIPE); | |
391 | ||
63e2b423 | 392 | /* freed by caller to simple_write_to_buffer */ |
5d5182ca JJ |
393 | data = aa_loaddata_alloc(alloc_size); |
394 | if (IS_ERR(data)) | |
395 | return data; | |
63e2b423 | 396 | |
5d5182ca | 397 | data->size = copy_size; |
5ac8c355 | 398 | if (copy_from_user(data->data, userbuf, copy_size)) { |
63e2b423 JJ |
399 | kvfree(data); |
400 | return ERR_PTR(-EFAULT); | |
401 | } | |
402 | ||
403 | return data; | |
404 | } | |
405 | ||
18e99f19 | 406 | static ssize_t policy_update(u32 mask, const char __user *buf, size_t size, |
b7fd2c03 | 407 | loff_t *pos, struct aa_ns *ns) |
63e2b423 | 408 | { |
5ac8c355 | 409 | struct aa_loaddata *data; |
637f688d JJ |
410 | struct aa_label *label; |
411 | ssize_t error; | |
cf797c0e | 412 | |
637f688d | 413 | label = begin_current_label_crit_section(); |
cf797c0e | 414 | |
5ac8c355 JJ |
415 | /* high level check about policy management - fine grained in |
416 | * below after unpack | |
417 | */ | |
637f688d | 418 | error = aa_may_manage_policy(label, ns, mask); |
5ac8c355 JJ |
419 | if (error) |
420 | return error; | |
63e2b423 | 421 | |
5ef50d01 | 422 | data = aa_simple_write_to_buffer(buf, size, size, pos); |
63e2b423 JJ |
423 | error = PTR_ERR(data); |
424 | if (!IS_ERR(data)) { | |
637f688d | 425 | error = aa_replace_profiles(ns, label, mask, data); |
5ac8c355 | 426 | aa_put_loaddata(data); |
63e2b423 | 427 | } |
637f688d | 428 | end_current_label_crit_section(label); |
63e2b423 JJ |
429 | |
430 | return error; | |
431 | } | |
432 | ||
b7fd2c03 | 433 | /* .load file hook fn to load policy */ |
5ac8c355 JJ |
434 | static ssize_t profile_load(struct file *f, const char __user *buf, size_t size, |
435 | loff_t *pos) | |
436 | { | |
b7fd2c03 | 437 | struct aa_ns *ns = aa_get_ns(f->f_inode->i_private); |
18e99f19 | 438 | int error = policy_update(AA_MAY_LOAD_POLICY, buf, size, pos, ns); |
b7fd2c03 JJ |
439 | |
440 | aa_put_ns(ns); | |
5ac8c355 JJ |
441 | |
442 | return error; | |
443 | } | |
444 | ||
63e2b423 | 445 | static const struct file_operations aa_fs_profile_load = { |
6038f373 AB |
446 | .write = profile_load, |
447 | .llseek = default_llseek, | |
63e2b423 JJ |
448 | }; |
449 | ||
450 | /* .replace file hook fn to load and/or replace policy */ | |
451 | static ssize_t profile_replace(struct file *f, const char __user *buf, | |
452 | size_t size, loff_t *pos) | |
453 | { | |
b7fd2c03 | 454 | struct aa_ns *ns = aa_get_ns(f->f_inode->i_private); |
18e99f19 JJ |
455 | int error = policy_update(AA_MAY_LOAD_POLICY | AA_MAY_REPLACE_POLICY, |
456 | buf, size, pos, ns); | |
b7fd2c03 | 457 | aa_put_ns(ns); |
63e2b423 JJ |
458 | |
459 | return error; | |
460 | } | |
461 | ||
462 | static const struct file_operations aa_fs_profile_replace = { | |
6038f373 AB |
463 | .write = profile_replace, |
464 | .llseek = default_llseek, | |
63e2b423 JJ |
465 | }; |
466 | ||
b7fd2c03 | 467 | /* .remove file hook fn to remove loaded policy */ |
63e2b423 JJ |
468 | static ssize_t profile_remove(struct file *f, const char __user *buf, |
469 | size_t size, loff_t *pos) | |
470 | { | |
5ac8c355 | 471 | struct aa_loaddata *data; |
637f688d | 472 | struct aa_label *label; |
63e2b423 | 473 | ssize_t error; |
b7fd2c03 | 474 | struct aa_ns *ns = aa_get_ns(f->f_inode->i_private); |
63e2b423 | 475 | |
637f688d | 476 | label = begin_current_label_crit_section(); |
5ac8c355 JJ |
477 | /* high level check about policy management - fine grained in |
478 | * below after unpack | |
479 | */ | |
637f688d | 480 | error = aa_may_manage_policy(label, ns, AA_MAY_REMOVE_POLICY); |
5ac8c355 JJ |
481 | if (error) |
482 | goto out; | |
483 | ||
63e2b423 JJ |
484 | /* |
485 | * aa_remove_profile needs a null terminated string so 1 extra | |
486 | * byte is allocated and the copied data is null terminated. | |
487 | */ | |
5ef50d01 | 488 | data = aa_simple_write_to_buffer(buf, size + 1, size, pos); |
63e2b423 JJ |
489 | |
490 | error = PTR_ERR(data); | |
491 | if (!IS_ERR(data)) { | |
5ac8c355 | 492 | data->data[size] = 0; |
637f688d | 493 | error = aa_remove_profiles(ns, label, data->data, size); |
5ac8c355 | 494 | aa_put_loaddata(data); |
63e2b423 | 495 | } |
5ac8c355 | 496 | out: |
637f688d | 497 | end_current_label_crit_section(label); |
b7fd2c03 | 498 | aa_put_ns(ns); |
63e2b423 JJ |
499 | return error; |
500 | } | |
501 | ||
502 | static const struct file_operations aa_fs_profile_remove = { | |
6038f373 AB |
503 | .write = profile_remove, |
504 | .llseek = default_llseek, | |
63e2b423 JJ |
505 | }; |
506 | ||
d9bf2c26 JJ |
507 | struct aa_revision { |
508 | struct aa_ns *ns; | |
509 | long last_read; | |
510 | }; | |
511 | ||
512 | /* revision file hook fn for policy loads */ | |
513 | static int ns_revision_release(struct inode *inode, struct file *file) | |
514 | { | |
515 | struct aa_revision *rev = file->private_data; | |
516 | ||
517 | if (rev) { | |
518 | aa_put_ns(rev->ns); | |
519 | kfree(rev); | |
520 | } | |
521 | ||
522 | return 0; | |
523 | } | |
524 | ||
525 | static ssize_t ns_revision_read(struct file *file, char __user *buf, | |
526 | size_t size, loff_t *ppos) | |
527 | { | |
528 | struct aa_revision *rev = file->private_data; | |
529 | char buffer[32]; | |
530 | long last_read; | |
531 | int avail; | |
532 | ||
533 | mutex_lock(&rev->ns->lock); | |
534 | last_read = rev->last_read; | |
535 | if (last_read == rev->ns->revision) { | |
536 | mutex_unlock(&rev->ns->lock); | |
537 | if (file->f_flags & O_NONBLOCK) | |
538 | return -EAGAIN; | |
539 | if (wait_event_interruptible(rev->ns->wait, | |
540 | last_read != | |
541 | READ_ONCE(rev->ns->revision))) | |
542 | return -ERESTARTSYS; | |
543 | mutex_lock(&rev->ns->lock); | |
544 | } | |
545 | ||
546 | avail = sprintf(buffer, "%ld\n", rev->ns->revision); | |
547 | if (*ppos + size > avail) { | |
548 | rev->last_read = rev->ns->revision; | |
549 | *ppos = 0; | |
550 | } | |
551 | mutex_unlock(&rev->ns->lock); | |
552 | ||
553 | return simple_read_from_buffer(buf, size, ppos, buffer, avail); | |
554 | } | |
555 | ||
556 | static int ns_revision_open(struct inode *inode, struct file *file) | |
557 | { | |
558 | struct aa_revision *rev = kzalloc(sizeof(*rev), GFP_KERNEL); | |
559 | ||
560 | if (!rev) | |
561 | return -ENOMEM; | |
562 | ||
563 | rev->ns = aa_get_ns(inode->i_private); | |
564 | if (!rev->ns) | |
565 | rev->ns = aa_get_current_ns(); | |
566 | file->private_data = rev; | |
567 | ||
568 | return 0; | |
569 | } | |
570 | ||
571 | static unsigned int ns_revision_poll(struct file *file, poll_table *pt) | |
572 | { | |
573 | struct aa_revision *rev = file->private_data; | |
574 | unsigned int mask = 0; | |
575 | ||
576 | if (rev) { | |
577 | mutex_lock(&rev->ns->lock); | |
578 | poll_wait(file, &rev->ns->wait, pt); | |
579 | if (rev->last_read < rev->ns->revision) | |
580 | mask |= POLLIN | POLLRDNORM; | |
581 | mutex_unlock(&rev->ns->lock); | |
582 | } | |
583 | ||
584 | return mask; | |
585 | } | |
586 | ||
5d5182ca JJ |
587 | void __aa_bump_ns_revision(struct aa_ns *ns) |
588 | { | |
589 | ns->revision++; | |
d9bf2c26 | 590 | wake_up_interruptible(&ns->wait); |
5d5182ca JJ |
591 | } |
592 | ||
d9bf2c26 JJ |
593 | static const struct file_operations aa_fs_ns_revision_fops = { |
594 | .owner = THIS_MODULE, | |
595 | .open = ns_revision_open, | |
596 | .poll = ns_revision_poll, | |
597 | .read = ns_revision_read, | |
598 | .llseek = generic_file_llseek, | |
599 | .release = ns_revision_release, | |
600 | }; | |
601 | ||
4f3b3f2d JJ |
602 | static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms, |
603 | const char *match_str, size_t match_len) | |
604 | { | |
605 | struct aa_perms tmp; | |
606 | struct aa_dfa *dfa; | |
607 | unsigned int state = 0; | |
608 | ||
637f688d | 609 | if (profile_unconfined(profile)) |
4f3b3f2d JJ |
610 | return; |
611 | if (profile->file.dfa && *match_str == AA_CLASS_FILE) { | |
612 | dfa = profile->file.dfa; | |
613 | state = aa_dfa_match_len(dfa, profile->file.start, | |
614 | match_str + 1, match_len - 1); | |
615 | tmp = nullperms; | |
616 | if (state) { | |
617 | struct path_cond cond = { }; | |
618 | ||
619 | tmp = aa_compute_fperms(dfa, state, &cond); | |
620 | } | |
621 | } else if (profile->policy.dfa) { | |
622 | if (!PROFILE_MEDIATES_SAFE(profile, *match_str)) | |
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); | |
629 | else | |
630 | tmp = nullperms; | |
631 | } | |
632 | aa_apply_modes_to_perms(profile, &tmp); | |
317d9a05 | 633 | aa_perms_accum_raw(perms, &tmp); |
4f3b3f2d JJ |
634 | } |
635 | ||
636 | ||
e025be0f WH |
637 | /** |
638 | * query_data - queries a policy and writes its data to buf | |
639 | * @buf: the resulting data is stored here (NOT NULL) | |
640 | * @buf_len: size of buf | |
641 | * @query: query string used to retrieve data | |
642 | * @query_len: size of query including second NUL byte | |
643 | * | |
644 | * The buffers pointed to by buf and query may overlap. The query buffer is | |
645 | * parsed before buf is written to. | |
646 | * | |
647 | * The query should look like "<LABEL>\0<KEY>\0", where <LABEL> is the name of | |
648 | * the security confinement context and <KEY> is the name of the data to | |
649 | * retrieve. <LABEL> and <KEY> must not be NUL-terminated. | |
650 | * | |
651 | * Don't expect the contents of buf to be preserved on failure. | |
652 | * | |
653 | * Returns: number of characters written to buf or -errno on failure | |
654 | */ | |
655 | static ssize_t query_data(char *buf, size_t buf_len, | |
656 | char *query, size_t query_len) | |
657 | { | |
658 | char *out; | |
659 | const char *key; | |
317d9a05 | 660 | struct label_it i; |
637f688d | 661 | struct aa_label *label, *curr; |
317d9a05 | 662 | struct aa_profile *profile; |
e025be0f WH |
663 | struct aa_data *data; |
664 | u32 bytes, blocks; | |
665 | __le32 outle32; | |
666 | ||
667 | if (!query_len) | |
668 | return -EINVAL; /* need a query */ | |
669 | ||
670 | key = query + strnlen(query, query_len) + 1; | |
671 | if (key + 1 >= query + query_len) | |
672 | return -EINVAL; /* not enough space for a non-empty key */ | |
673 | if (key + strnlen(key, query + query_len - key) >= query + query_len) | |
674 | return -EINVAL; /* must end with NUL */ | |
675 | ||
676 | if (buf_len < sizeof(bytes) + sizeof(blocks)) | |
677 | return -EINVAL; /* not enough space */ | |
678 | ||
637f688d JJ |
679 | curr = begin_current_label_crit_section(); |
680 | label = aa_label_parse(curr, query, GFP_KERNEL, false, false); | |
681 | end_current_label_crit_section(curr); | |
682 | if (IS_ERR(label)) | |
683 | return PTR_ERR(label); | |
e025be0f WH |
684 | |
685 | /* We are going to leave space for two numbers. The first is the total | |
686 | * number of bytes we are writing after the first number. This is so | |
687 | * users can read the full output without reallocation. | |
688 | * | |
689 | * The second number is the number of data blocks we're writing. An | |
690 | * application might be confined by multiple policies having data in | |
691 | * the same key. | |
692 | */ | |
693 | memset(buf, 0, sizeof(bytes) + sizeof(blocks)); | |
694 | out = buf + sizeof(bytes) + sizeof(blocks); | |
695 | ||
696 | blocks = 0; | |
317d9a05 JJ |
697 | label_for_each_confined(i, label, profile) { |
698 | if (!profile->data) | |
699 | continue; | |
700 | ||
701 | data = rhashtable_lookup_fast(profile->data, &key, | |
702 | profile->data->p); | |
e025be0f WH |
703 | |
704 | if (data) { | |
317d9a05 JJ |
705 | if (out + sizeof(outle32) + data->size > buf + |
706 | buf_len) { | |
637f688d | 707 | aa_put_label(label); |
e025be0f | 708 | return -EINVAL; /* not enough space */ |
637f688d | 709 | } |
e025be0f WH |
710 | outle32 = __cpu_to_le32(data->size); |
711 | memcpy(out, &outle32, sizeof(outle32)); | |
712 | out += sizeof(outle32); | |
713 | memcpy(out, data->data, data->size); | |
714 | out += data->size; | |
715 | blocks++; | |
716 | } | |
717 | } | |
637f688d | 718 | aa_put_label(label); |
e025be0f WH |
719 | |
720 | outle32 = __cpu_to_le32(out - buf - sizeof(bytes)); | |
721 | memcpy(buf, &outle32, sizeof(outle32)); | |
722 | outle32 = __cpu_to_le32(blocks); | |
723 | memcpy(buf + sizeof(bytes), &outle32, sizeof(outle32)); | |
724 | ||
725 | return out - buf; | |
726 | } | |
727 | ||
4f3b3f2d JJ |
728 | /** |
729 | * query_label - queries a label and writes permissions to buf | |
730 | * @buf: the resulting permissions string is stored here (NOT NULL) | |
731 | * @buf_len: size of buf | |
732 | * @query: binary query string to match against the dfa | |
733 | * @query_len: size of query | |
734 | * @view_only: only compute for querier's view | |
735 | * | |
736 | * The buffers pointed to by buf and query may overlap. The query buffer is | |
737 | * parsed before buf is written to. | |
738 | * | |
739 | * The query should look like "LABEL_NAME\0DFA_STRING" where LABEL_NAME is | |
740 | * the name of the label, in the current namespace, that is to be queried and | |
741 | * DFA_STRING is a binary string to match against the label(s)'s DFA. | |
742 | * | |
743 | * LABEL_NAME must be NUL terminated. DFA_STRING may contain NUL characters | |
744 | * but must *not* be NUL terminated. | |
745 | * | |
746 | * Returns: number of characters written to buf or -errno on failure | |
747 | */ | |
748 | static ssize_t query_label(char *buf, size_t buf_len, | |
749 | char *query, size_t query_len, bool view_only) | |
750 | { | |
317d9a05 | 751 | struct aa_profile *profile; |
637f688d | 752 | struct aa_label *label, *curr; |
4f3b3f2d JJ |
753 | char *label_name, *match_str; |
754 | size_t label_name_len, match_len; | |
755 | struct aa_perms perms; | |
317d9a05 | 756 | struct label_it i; |
4f3b3f2d JJ |
757 | |
758 | if (!query_len) | |
759 | return -EINVAL; | |
760 | ||
761 | label_name = query; | |
762 | label_name_len = strnlen(query, query_len); | |
763 | if (!label_name_len || label_name_len == query_len) | |
764 | return -EINVAL; | |
765 | ||
766 | /** | |
767 | * The extra byte is to account for the null byte between the | |
768 | * profile name and dfa string. profile_name_len is greater | |
769 | * than zero and less than query_len, so a byte can be safely | |
770 | * added or subtracted. | |
771 | */ | |
772 | match_str = label_name + label_name_len + 1; | |
773 | match_len = query_len - label_name_len - 1; | |
774 | ||
637f688d JJ |
775 | curr = begin_current_label_crit_section(); |
776 | label = aa_label_parse(curr, label_name, GFP_KERNEL, false, false); | |
777 | end_current_label_crit_section(curr); | |
778 | if (IS_ERR(label)) | |
779 | return PTR_ERR(label); | |
4f3b3f2d JJ |
780 | |
781 | perms = allperms; | |
317d9a05 JJ |
782 | if (view_only) { |
783 | label_for_each_in_ns(i, labels_ns(label), label, profile) { | |
784 | profile_query_cb(profile, &perms, match_str, match_len); | |
785 | } | |
786 | } else { | |
787 | label_for_each(i, label, profile) { | |
788 | profile_query_cb(profile, &perms, match_str, match_len); | |
789 | } | |
790 | } | |
791 | aa_put_label(label); | |
4f3b3f2d JJ |
792 | |
793 | return scnprintf(buf, buf_len, | |
794 | "allow 0x%08x\ndeny 0x%08x\naudit 0x%08x\nquiet 0x%08x\n", | |
795 | perms.allow, perms.deny, perms.audit, perms.quiet); | |
796 | } | |
797 | ||
1dea3b41 JJ |
798 | /* |
799 | * Transaction based IO. | |
800 | * The file expects a write which triggers the transaction, and then | |
801 | * possibly a read(s) which collects the result - which is stored in a | |
802 | * file-local buffer. Once a new write is performed, a new set of results | |
803 | * are stored in the file-local buffer. | |
804 | */ | |
805 | struct multi_transaction { | |
806 | struct kref count; | |
807 | ssize_t size; | |
808 | char data[0]; | |
809 | }; | |
810 | ||
811 | #define MULTI_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct multi_transaction)) | |
812 | /* TODO: replace with per file lock */ | |
813 | static DEFINE_SPINLOCK(multi_transaction_lock); | |
814 | ||
815 | static void multi_transaction_kref(struct kref *kref) | |
816 | { | |
817 | struct multi_transaction *t; | |
818 | ||
819 | t = container_of(kref, struct multi_transaction, count); | |
820 | free_page((unsigned long) t); | |
821 | } | |
822 | ||
823 | static struct multi_transaction * | |
824 | get_multi_transaction(struct multi_transaction *t) | |
825 | { | |
826 | if (t) | |
827 | kref_get(&(t->count)); | |
828 | ||
829 | return t; | |
830 | } | |
831 | ||
832 | static void put_multi_transaction(struct multi_transaction *t) | |
833 | { | |
834 | if (t) | |
835 | kref_put(&(t->count), multi_transaction_kref); | |
836 | } | |
837 | ||
838 | /* does not increment @new's count */ | |
839 | static void multi_transaction_set(struct file *file, | |
840 | struct multi_transaction *new, size_t n) | |
841 | { | |
842 | struct multi_transaction *old; | |
843 | ||
844 | AA_BUG(n > MULTI_TRANSACTION_LIMIT); | |
845 | ||
846 | new->size = n; | |
847 | spin_lock(&multi_transaction_lock); | |
848 | old = (struct multi_transaction *) file->private_data; | |
849 | file->private_data = new; | |
850 | spin_unlock(&multi_transaction_lock); | |
851 | put_multi_transaction(old); | |
852 | } | |
853 | ||
854 | static struct multi_transaction *multi_transaction_new(struct file *file, | |
855 | const char __user *buf, | |
856 | size_t size) | |
857 | { | |
858 | struct multi_transaction *t; | |
859 | ||
860 | if (size > MULTI_TRANSACTION_LIMIT - 1) | |
861 | return ERR_PTR(-EFBIG); | |
862 | ||
863 | t = (struct multi_transaction *)get_zeroed_page(GFP_KERNEL); | |
864 | if (!t) | |
865 | return ERR_PTR(-ENOMEM); | |
866 | kref_init(&t->count); | |
867 | if (copy_from_user(t->data, buf, size)) | |
868 | return ERR_PTR(-EFAULT); | |
869 | ||
870 | return t; | |
871 | } | |
872 | ||
873 | static ssize_t multi_transaction_read(struct file *file, char __user *buf, | |
874 | size_t size, loff_t *pos) | |
875 | { | |
876 | struct multi_transaction *t; | |
877 | ssize_t ret; | |
878 | ||
879 | spin_lock(&multi_transaction_lock); | |
880 | t = get_multi_transaction(file->private_data); | |
881 | spin_unlock(&multi_transaction_lock); | |
882 | if (!t) | |
883 | return 0; | |
884 | ||
885 | ret = simple_read_from_buffer(buf, size, pos, t->data, t->size); | |
886 | put_multi_transaction(t); | |
887 | ||
888 | return ret; | |
889 | } | |
890 | ||
891 | static int multi_transaction_release(struct inode *inode, struct file *file) | |
892 | { | |
893 | put_multi_transaction(file->private_data); | |
894 | ||
895 | return 0; | |
896 | } | |
897 | ||
317d9a05 JJ |
898 | #define QUERY_CMD_LABEL "label\0" |
899 | #define QUERY_CMD_LABEL_LEN 6 | |
4f3b3f2d JJ |
900 | #define QUERY_CMD_PROFILE "profile\0" |
901 | #define QUERY_CMD_PROFILE_LEN 8 | |
317d9a05 JJ |
902 | #define QUERY_CMD_LABELALL "labelall\0" |
903 | #define QUERY_CMD_LABELALL_LEN 9 | |
e025be0f WH |
904 | #define QUERY_CMD_DATA "data\0" |
905 | #define QUERY_CMD_DATA_LEN 5 | |
906 | ||
907 | /** | |
908 | * aa_write_access - generic permissions and data query | |
909 | * @file: pointer to open apparmorfs/access file | |
910 | * @ubuf: user buffer containing the complete query string (NOT NULL) | |
911 | * @count: size of ubuf | |
912 | * @ppos: position in the file (MUST BE ZERO) | |
913 | * | |
914 | * Allows for one permissions or data query per open(), write(), and read() | |
915 | * sequence. The only queries currently supported are label-based queries for | |
916 | * permissions or data. | |
917 | * | |
918 | * For permissions queries, ubuf must begin with "label\0", followed by the | |
919 | * profile query specific format described in the query_label() function | |
920 | * documentation. | |
921 | * | |
922 | * For data queries, ubuf must have the form "data\0<LABEL>\0<KEY>\0", where | |
923 | * <LABEL> is the name of the security confinement context and <KEY> is the | |
924 | * name of the data to retrieve. | |
925 | * | |
926 | * Returns: number of bytes written or -errno on failure | |
927 | */ | |
928 | static ssize_t aa_write_access(struct file *file, const char __user *ubuf, | |
929 | size_t count, loff_t *ppos) | |
930 | { | |
1dea3b41 | 931 | struct multi_transaction *t; |
e025be0f WH |
932 | ssize_t len; |
933 | ||
934 | if (*ppos) | |
935 | return -ESPIPE; | |
936 | ||
1dea3b41 JJ |
937 | t = multi_transaction_new(file, ubuf, count); |
938 | if (IS_ERR(t)) | |
939 | return PTR_ERR(t); | |
e025be0f | 940 | |
4f3b3f2d JJ |
941 | if (count > QUERY_CMD_PROFILE_LEN && |
942 | !memcmp(t->data, QUERY_CMD_PROFILE, QUERY_CMD_PROFILE_LEN)) { | |
943 | len = query_label(t->data, MULTI_TRANSACTION_LIMIT, | |
944 | t->data + QUERY_CMD_PROFILE_LEN, | |
945 | count - QUERY_CMD_PROFILE_LEN, true); | |
317d9a05 JJ |
946 | } else if (count > QUERY_CMD_LABEL_LEN && |
947 | !memcmp(t->data, QUERY_CMD_LABEL, QUERY_CMD_LABEL_LEN)) { | |
948 | len = query_label(t->data, MULTI_TRANSACTION_LIMIT, | |
949 | t->data + QUERY_CMD_LABEL_LEN, | |
950 | count - QUERY_CMD_LABEL_LEN, true); | |
951 | } else if (count > QUERY_CMD_LABELALL_LEN && | |
952 | !memcmp(t->data, QUERY_CMD_LABELALL, | |
953 | QUERY_CMD_LABELALL_LEN)) { | |
954 | len = query_label(t->data, MULTI_TRANSACTION_LIMIT, | |
955 | t->data + QUERY_CMD_LABELALL_LEN, | |
956 | count - QUERY_CMD_LABELALL_LEN, false); | |
4f3b3f2d | 957 | } else if (count > QUERY_CMD_DATA_LEN && |
1dea3b41 JJ |
958 | !memcmp(t->data, QUERY_CMD_DATA, QUERY_CMD_DATA_LEN)) { |
959 | len = query_data(t->data, MULTI_TRANSACTION_LIMIT, | |
960 | t->data + QUERY_CMD_DATA_LEN, | |
e025be0f WH |
961 | count - QUERY_CMD_DATA_LEN); |
962 | } else | |
963 | len = -EINVAL; | |
964 | ||
1dea3b41 JJ |
965 | if (len < 0) { |
966 | put_multi_transaction(t); | |
e025be0f | 967 | return len; |
1dea3b41 | 968 | } |
e025be0f | 969 | |
1dea3b41 | 970 | multi_transaction_set(file, t, len); |
e025be0f WH |
971 | |
972 | return count; | |
973 | } | |
974 | ||
c97204ba | 975 | static const struct file_operations aa_sfs_access = { |
e025be0f | 976 | .write = aa_write_access, |
1dea3b41 JJ |
977 | .read = multi_transaction_read, |
978 | .release = multi_transaction_release, | |
e025be0f WH |
979 | .llseek = generic_file_llseek, |
980 | }; | |
981 | ||
c97204ba | 982 | static int aa_sfs_seq_show(struct seq_file *seq, void *v) |
e74abcf3 | 983 | { |
c97204ba | 984 | struct aa_sfs_entry *fs_file = seq->private; |
e74abcf3 KC |
985 | |
986 | if (!fs_file) | |
987 | return 0; | |
988 | ||
989 | switch (fs_file->v_type) { | |
c97204ba | 990 | case AA_SFS_TYPE_BOOLEAN: |
e74abcf3 KC |
991 | seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no"); |
992 | break; | |
c97204ba | 993 | case AA_SFS_TYPE_STRING: |
a9bf8e9f KC |
994 | seq_printf(seq, "%s\n", fs_file->v.string); |
995 | break; | |
c97204ba | 996 | case AA_SFS_TYPE_U64: |
e74abcf3 KC |
997 | seq_printf(seq, "%#08lx\n", fs_file->v.u64); |
998 | break; | |
999 | default: | |
1000 | /* Ignore unpritable entry types. */ | |
1001 | break; | |
1002 | } | |
1003 | ||
1004 | return 0; | |
1005 | } | |
1006 | ||
c97204ba | 1007 | static int aa_sfs_seq_open(struct inode *inode, struct file *file) |
e74abcf3 | 1008 | { |
c97204ba | 1009 | return single_open(file, aa_sfs_seq_show, inode->i_private); |
e74abcf3 KC |
1010 | } |
1011 | ||
c97204ba | 1012 | const struct file_operations aa_sfs_seq_file_ops = { |
e74abcf3 | 1013 | .owner = THIS_MODULE, |
c97204ba | 1014 | .open = aa_sfs_seq_open, |
e74abcf3 KC |
1015 | .read = seq_read, |
1016 | .llseek = seq_lseek, | |
1017 | .release = single_release, | |
1018 | }; | |
1019 | ||
52b97de3 JJ |
1020 | /* |
1021 | * profile based file operations | |
1022 | * policy/profiles/XXXX/profiles/ * | |
1023 | */ | |
1024 | ||
1025 | #define SEQ_PROFILE_FOPS(NAME) \ | |
1026 | static int seq_profile_ ##NAME ##_open(struct inode *inode, struct file *file)\ | |
1027 | { \ | |
1028 | return seq_profile_open(inode, file, seq_profile_ ##NAME ##_show); \ | |
1029 | } \ | |
1030 | \ | |
1031 | static const struct file_operations seq_profile_ ##NAME ##_fops = { \ | |
1032 | .owner = THIS_MODULE, \ | |
1033 | .open = seq_profile_ ##NAME ##_open, \ | |
1034 | .read = seq_read, \ | |
1035 | .llseek = seq_lseek, \ | |
1036 | .release = seq_profile_release, \ | |
1037 | } \ | |
1038 | ||
1039 | static int seq_profile_open(struct inode *inode, struct file *file, | |
1040 | int (*show)(struct seq_file *, void *)) | |
0d259f04 | 1041 | { |
8399588a JJ |
1042 | struct aa_proxy *proxy = aa_get_proxy(inode->i_private); |
1043 | int error = single_open(file, show, proxy); | |
0d259f04 JJ |
1044 | |
1045 | if (error) { | |
1046 | file->private_data = NULL; | |
8399588a | 1047 | aa_put_proxy(proxy); |
0d259f04 JJ |
1048 | } |
1049 | ||
1050 | return error; | |
1051 | } | |
1052 | ||
52b97de3 | 1053 | static int seq_profile_release(struct inode *inode, struct file *file) |
0d259f04 JJ |
1054 | { |
1055 | struct seq_file *seq = (struct seq_file *) file->private_data; | |
1056 | if (seq) | |
8399588a | 1057 | aa_put_proxy(seq->private); |
0d259f04 JJ |
1058 | return single_release(inode, file); |
1059 | } | |
1060 | ||
52b97de3 | 1061 | static int seq_profile_name_show(struct seq_file *seq, void *v) |
0d259f04 | 1062 | { |
8399588a | 1063 | struct aa_proxy *proxy = seq->private; |
637f688d JJ |
1064 | struct aa_label *label = aa_get_label_rcu(&proxy->label); |
1065 | struct aa_profile *profile = labels_profile(label); | |
0d259f04 | 1066 | seq_printf(seq, "%s\n", profile->base.name); |
637f688d | 1067 | aa_put_label(label); |
0d259f04 JJ |
1068 | |
1069 | return 0; | |
1070 | } | |
1071 | ||
52b97de3 | 1072 | static int seq_profile_mode_show(struct seq_file *seq, void *v) |
0d259f04 | 1073 | { |
8399588a | 1074 | struct aa_proxy *proxy = seq->private; |
637f688d JJ |
1075 | struct aa_label *label = aa_get_label_rcu(&proxy->label); |
1076 | struct aa_profile *profile = labels_profile(label); | |
0d259f04 | 1077 | seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]); |
637f688d | 1078 | aa_put_label(label); |
0d259f04 JJ |
1079 | |
1080 | return 0; | |
1081 | } | |
1082 | ||
52b97de3 | 1083 | static int seq_profile_attach_show(struct seq_file *seq, void *v) |
556d0be7 | 1084 | { |
8399588a | 1085 | struct aa_proxy *proxy = seq->private; |
637f688d JJ |
1086 | struct aa_label *label = aa_get_label_rcu(&proxy->label); |
1087 | struct aa_profile *profile = labels_profile(label); | |
556d0be7 JJ |
1088 | if (profile->attach) |
1089 | seq_printf(seq, "%s\n", profile->attach); | |
1090 | else if (profile->xmatch) | |
1091 | seq_puts(seq, "<unknown>\n"); | |
1092 | else | |
1093 | seq_printf(seq, "%s\n", profile->base.name); | |
637f688d | 1094 | aa_put_label(label); |
556d0be7 JJ |
1095 | |
1096 | return 0; | |
1097 | } | |
1098 | ||
52b97de3 | 1099 | static int seq_profile_hash_show(struct seq_file *seq, void *v) |
f8eb8a13 | 1100 | { |
8399588a | 1101 | struct aa_proxy *proxy = seq->private; |
637f688d JJ |
1102 | struct aa_label *label = aa_get_label_rcu(&proxy->label); |
1103 | struct aa_profile *profile = labels_profile(label); | |
f8eb8a13 JJ |
1104 | unsigned int i, size = aa_hash_size(); |
1105 | ||
1106 | if (profile->hash) { | |
1107 | for (i = 0; i < size; i++) | |
1108 | seq_printf(seq, "%.2x", profile->hash[i]); | |
47dbd1cd | 1109 | seq_putc(seq, '\n'); |
f8eb8a13 | 1110 | } |
637f688d | 1111 | aa_put_label(label); |
f8eb8a13 JJ |
1112 | |
1113 | return 0; | |
1114 | } | |
1115 | ||
52b97de3 JJ |
1116 | SEQ_PROFILE_FOPS(name); |
1117 | SEQ_PROFILE_FOPS(mode); | |
1118 | SEQ_PROFILE_FOPS(attach); | |
1119 | SEQ_PROFILE_FOPS(hash); | |
f8eb8a13 | 1120 | |
64c86970 JJ |
1121 | /* |
1122 | * namespace based files | |
1123 | * several root files and | |
1124 | * policy/ * | |
1125 | */ | |
f8eb8a13 | 1126 | |
64c86970 JJ |
1127 | #define SEQ_NS_FOPS(NAME) \ |
1128 | static int seq_ns_ ##NAME ##_open(struct inode *inode, struct file *file) \ | |
1129 | { \ | |
1130 | return single_open(file, seq_ns_ ##NAME ##_show, inode->i_private); \ | |
1131 | } \ | |
1132 | \ | |
1133 | static const struct file_operations seq_ns_ ##NAME ##_fops = { \ | |
1134 | .owner = THIS_MODULE, \ | |
1135 | .open = seq_ns_ ##NAME ##_open, \ | |
1136 | .read = seq_read, \ | |
1137 | .llseek = seq_lseek, \ | |
1138 | .release = single_release, \ | |
1139 | } \ | |
3e3e5695 | 1140 | |
64c86970 | 1141 | static int seq_ns_level_show(struct seq_file *seq, void *v) |
a71ada30 | 1142 | { |
637f688d | 1143 | struct aa_label *label; |
a71ada30 | 1144 | |
637f688d JJ |
1145 | label = begin_current_label_crit_section(); |
1146 | seq_printf(seq, "%d\n", labels_ns(label)->level); | |
1147 | end_current_label_crit_section(label); | |
a71ada30 JJ |
1148 | |
1149 | return 0; | |
1150 | } | |
1151 | ||
64c86970 | 1152 | static int seq_ns_name_show(struct seq_file *seq, void *v) |
3e3e5695 | 1153 | { |
637f688d | 1154 | struct aa_label *label = begin_current_label_crit_section(); |
3e3e5695 | 1155 | |
637f688d JJ |
1156 | seq_printf(seq, "%s\n", aa_ns_name(labels_ns(label), |
1157 | labels_ns(label), true)); | |
1158 | end_current_label_crit_section(label); | |
3e3e5695 JJ |
1159 | |
1160 | return 0; | |
1161 | } | |
1162 | ||
64c86970 JJ |
1163 | SEQ_NS_FOPS(level); |
1164 | SEQ_NS_FOPS(name); | |
3e3e5695 | 1165 | |
5d5182ca JJ |
1166 | |
1167 | /* policy/raw_data/ * file ops */ | |
1168 | ||
1169 | #define SEQ_RAWDATA_FOPS(NAME) \ | |
1170 | static int seq_rawdata_ ##NAME ##_open(struct inode *inode, struct file *file)\ | |
1171 | { \ | |
1172 | return seq_rawdata_open(inode, file, seq_rawdata_ ##NAME ##_show); \ | |
1173 | } \ | |
1174 | \ | |
1175 | static const struct file_operations seq_rawdata_ ##NAME ##_fops = { \ | |
1176 | .owner = THIS_MODULE, \ | |
1177 | .open = seq_rawdata_ ##NAME ##_open, \ | |
1178 | .read = seq_read, \ | |
1179 | .llseek = seq_lseek, \ | |
1180 | .release = seq_rawdata_release, \ | |
1181 | } \ | |
1182 | ||
1183 | static int seq_rawdata_open(struct inode *inode, struct file *file, | |
1184 | int (*show)(struct seq_file *, void *)) | |
5ac8c355 | 1185 | { |
5d5182ca JJ |
1186 | struct aa_loaddata *data = __aa_get_loaddata(inode->i_private); |
1187 | int error; | |
5ac8c355 | 1188 | |
5d5182ca JJ |
1189 | if (!data) |
1190 | /* lost race this ent is being reaped */ | |
1191 | return -ENOENT; | |
1192 | ||
1193 | error = single_open(file, show, data); | |
1194 | if (error) { | |
1195 | AA_BUG(file->private_data && | |
1196 | ((struct seq_file *)file->private_data)->private); | |
1197 | aa_put_loaddata(data); | |
1198 | } | |
1199 | ||
1200 | return error; | |
5ac8c355 JJ |
1201 | } |
1202 | ||
5d5182ca | 1203 | static int seq_rawdata_release(struct inode *inode, struct file *file) |
5ac8c355 | 1204 | { |
5d5182ca | 1205 | struct seq_file *seq = (struct seq_file *) file->private_data; |
5ac8c355 | 1206 | |
5d5182ca JJ |
1207 | if (seq) |
1208 | aa_put_loaddata(seq->private); | |
0ff3d97f | 1209 | |
5d5182ca JJ |
1210 | return single_release(inode, file); |
1211 | } | |
1212 | ||
1213 | static int seq_rawdata_abi_show(struct seq_file *seq, void *v) | |
1214 | { | |
1215 | struct aa_loaddata *data = seq->private; | |
1216 | ||
1217 | seq_printf(seq, "v%d\n", data->abi); | |
5ac8c355 JJ |
1218 | |
1219 | return 0; | |
1220 | } | |
1221 | ||
5d5182ca | 1222 | static int seq_rawdata_revision_show(struct seq_file *seq, void *v) |
5ac8c355 | 1223 | { |
5d5182ca | 1224 | struct aa_loaddata *data = seq->private; |
5ac8c355 | 1225 | |
5d5182ca JJ |
1226 | seq_printf(seq, "%ld\n", data->revision); |
1227 | ||
1228 | return 0; | |
1229 | } | |
5ac8c355 | 1230 | |
5d5182ca | 1231 | static int seq_rawdata_hash_show(struct seq_file *seq, void *v) |
5ac8c355 | 1232 | { |
5d5182ca | 1233 | struct aa_loaddata *data = seq->private; |
5ac8c355 JJ |
1234 | unsigned int i, size = aa_hash_size(); |
1235 | ||
5d5182ca | 1236 | if (data->hash) { |
5ac8c355 | 1237 | for (i = 0; i < size; i++) |
5d5182ca | 1238 | seq_printf(seq, "%.2x", data->hash[i]); |
47dbd1cd | 1239 | seq_putc(seq, '\n'); |
5ac8c355 | 1240 | } |
5ac8c355 JJ |
1241 | |
1242 | return 0; | |
1243 | } | |
1244 | ||
5d5182ca JJ |
1245 | SEQ_RAWDATA_FOPS(abi); |
1246 | SEQ_RAWDATA_FOPS(revision); | |
1247 | SEQ_RAWDATA_FOPS(hash); | |
5ac8c355 JJ |
1248 | |
1249 | static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size, | |
1250 | loff_t *ppos) | |
1251 | { | |
1252 | struct aa_loaddata *rawdata = file->private_data; | |
1253 | ||
1254 | return simple_read_from_buffer(buf, size, ppos, rawdata->data, | |
1255 | rawdata->size); | |
1256 | } | |
1257 | ||
5d5182ca | 1258 | static int rawdata_release(struct inode *inode, struct file *file) |
5ac8c355 | 1259 | { |
5d5182ca JJ |
1260 | aa_put_loaddata(file->private_data); |
1261 | ||
1262 | return 0; | |
1263 | } | |
5ac8c355 | 1264 | |
5d5182ca JJ |
1265 | static int rawdata_open(struct inode *inode, struct file *file) |
1266 | { | |
5ac8c355 JJ |
1267 | if (!policy_view_capable(NULL)) |
1268 | return -EACCES; | |
5d5182ca JJ |
1269 | file->private_data = __aa_get_loaddata(inode->i_private); |
1270 | if (!file->private_data) | |
1271 | /* lost race: this entry is being reaped */ | |
1272 | return -ENOENT; | |
5ac8c355 JJ |
1273 | |
1274 | return 0; | |
1275 | } | |
1276 | ||
5d5182ca | 1277 | static const struct file_operations rawdata_fops = { |
5ac8c355 JJ |
1278 | .open = rawdata_open, |
1279 | .read = rawdata_read, | |
1280 | .llseek = generic_file_llseek, | |
1281 | .release = rawdata_release, | |
1282 | }; | |
1283 | ||
5d5182ca JJ |
1284 | static void remove_rawdata_dents(struct aa_loaddata *rawdata) |
1285 | { | |
1286 | int i; | |
1287 | ||
1288 | for (i = 0; i < AAFS_LOADDATA_NDENTS; i++) { | |
1289 | if (!IS_ERR_OR_NULL(rawdata->dents[i])) { | |
1290 | /* no refcounts on i_private */ | |
c961ee5f | 1291 | aafs_remove(rawdata->dents[i]); |
5d5182ca JJ |
1292 | rawdata->dents[i] = NULL; |
1293 | } | |
1294 | } | |
1295 | } | |
1296 | ||
1297 | void __aa_fs_remove_rawdata(struct aa_loaddata *rawdata) | |
1298 | { | |
1299 | AA_BUG(rawdata->ns && !mutex_is_locked(&rawdata->ns->lock)); | |
1300 | ||
1301 | if (rawdata->ns) { | |
1302 | remove_rawdata_dents(rawdata); | |
1303 | list_del_init(&rawdata->list); | |
1304 | aa_put_ns(rawdata->ns); | |
1305 | rawdata->ns = NULL; | |
1306 | } | |
1307 | } | |
1308 | ||
1309 | int __aa_fs_create_rawdata(struct aa_ns *ns, struct aa_loaddata *rawdata) | |
1310 | { | |
1311 | struct dentry *dent, *dir; | |
1312 | ||
1313 | AA_BUG(!ns); | |
1314 | AA_BUG(!rawdata); | |
1315 | AA_BUG(!mutex_is_locked(&ns->lock)); | |
1316 | AA_BUG(!ns_subdata_dir(ns)); | |
1317 | ||
1318 | /* | |
1319 | * just use ns revision dir was originally created at. This is | |
1320 | * under ns->lock and if load is successful revision will be | |
1321 | * bumped and is guaranteed to be unique | |
1322 | */ | |
1323 | rawdata->name = kasprintf(GFP_KERNEL, "%ld", ns->revision); | |
1324 | if (!rawdata->name) | |
1325 | return -ENOMEM; | |
1326 | ||
c961ee5f | 1327 | dir = aafs_create_dir(rawdata->name, ns_subdata_dir(ns)); |
5d5182ca JJ |
1328 | if (IS_ERR(dir)) |
1329 | /* ->name freed when rawdata freed */ | |
1330 | return PTR_ERR(dir); | |
1331 | rawdata->dents[AAFS_LOADDATA_DIR] = dir; | |
1332 | ||
c961ee5f | 1333 | dent = aafs_create_file("abi", S_IFREG | 0444, dir, rawdata, |
5d5182ca JJ |
1334 | &seq_rawdata_abi_fops); |
1335 | if (IS_ERR(dent)) | |
1336 | goto fail; | |
1337 | rawdata->dents[AAFS_LOADDATA_ABI] = dent; | |
1338 | ||
c961ee5f | 1339 | dent = aafs_create_file("revision", S_IFREG | 0444, dir, rawdata, |
5d5182ca JJ |
1340 | &seq_rawdata_revision_fops); |
1341 | if (IS_ERR(dent)) | |
1342 | goto fail; | |
1343 | rawdata->dents[AAFS_LOADDATA_REVISION] = dent; | |
1344 | ||
1345 | if (aa_g_hash_policy) { | |
c961ee5f | 1346 | dent = aafs_create_file("sha1", S_IFREG | 0444, dir, |
5d5182ca JJ |
1347 | rawdata, &seq_rawdata_hash_fops); |
1348 | if (IS_ERR(dent)) | |
1349 | goto fail; | |
1350 | rawdata->dents[AAFS_LOADDATA_HASH] = dent; | |
1351 | } | |
1352 | ||
c961ee5f | 1353 | dent = aafs_create_file("raw_data", S_IFREG | 0444, |
5d5182ca JJ |
1354 | dir, rawdata, &rawdata_fops); |
1355 | if (IS_ERR(dent)) | |
1356 | goto fail; | |
1357 | rawdata->dents[AAFS_LOADDATA_DATA] = dent; | |
1358 | d_inode(dent)->i_size = rawdata->size; | |
1359 | ||
1360 | rawdata->ns = aa_get_ns(ns); | |
1361 | list_add(&rawdata->list, &ns->rawdata_list); | |
1362 | /* no refcount on inode rawdata */ | |
1363 | ||
1364 | return 0; | |
1365 | ||
1366 | fail: | |
1367 | remove_rawdata_dents(rawdata); | |
1368 | ||
1369 | return PTR_ERR(dent); | |
1370 | } | |
1371 | ||
0d259f04 | 1372 | /** fns to setup dynamic per profile/namespace files **/ |
c97204ba JJ |
1373 | |
1374 | /** | |
1375 | * | |
1376 | * Requires: @profile->ns->lock held | |
1377 | */ | |
1378 | void __aafs_profile_rmdir(struct aa_profile *profile) | |
0d259f04 JJ |
1379 | { |
1380 | struct aa_profile *child; | |
1381 | int i; | |
1382 | ||
1383 | if (!profile) | |
1384 | return; | |
1385 | ||
1386 | list_for_each_entry(child, &profile->base.profiles, base.list) | |
c97204ba | 1387 | __aafs_profile_rmdir(child); |
0d259f04 JJ |
1388 | |
1389 | for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) { | |
8399588a | 1390 | struct aa_proxy *proxy; |
0d259f04 JJ |
1391 | if (!profile->dents[i]) |
1392 | continue; | |
1393 | ||
8399588a | 1394 | proxy = d_inode(profile->dents[i])->i_private; |
c961ee5f | 1395 | aafs_remove(profile->dents[i]); |
8399588a | 1396 | aa_put_proxy(proxy); |
0d259f04 JJ |
1397 | profile->dents[i] = NULL; |
1398 | } | |
1399 | } | |
1400 | ||
c97204ba JJ |
1401 | /** |
1402 | * | |
1403 | * Requires: @old->ns->lock held | |
1404 | */ | |
1405 | void __aafs_profile_migrate_dents(struct aa_profile *old, | |
1406 | struct aa_profile *new) | |
0d259f04 JJ |
1407 | { |
1408 | int i; | |
1409 | ||
1410 | for (i = 0; i < AAFS_PROF_SIZEOF; i++) { | |
1411 | new->dents[i] = old->dents[i]; | |
d671e890 | 1412 | if (new->dents[i]) |
078cd827 | 1413 | new->dents[i]->d_inode->i_mtime = current_time(new->dents[i]->d_inode); |
0d259f04 JJ |
1414 | old->dents[i] = NULL; |
1415 | } | |
1416 | } | |
1417 | ||
1418 | static struct dentry *create_profile_file(struct dentry *dir, const char *name, | |
1419 | struct aa_profile *profile, | |
1420 | const struct file_operations *fops) | |
1421 | { | |
637f688d | 1422 | struct aa_proxy *proxy = aa_get_proxy(profile->label.proxy); |
0d259f04 JJ |
1423 | struct dentry *dent; |
1424 | ||
c961ee5f | 1425 | dent = aafs_create_file(name, S_IFREG | 0444, dir, proxy, fops); |
0d259f04 | 1426 | if (IS_ERR(dent)) |
8399588a | 1427 | aa_put_proxy(proxy); |
0d259f04 JJ |
1428 | |
1429 | return dent; | |
1430 | } | |
1431 | ||
5d5182ca JJ |
1432 | static int profile_depth(struct aa_profile *profile) |
1433 | { | |
1434 | int depth = 0; | |
1435 | ||
1436 | rcu_read_lock(); | |
1437 | for (depth = 0; profile; profile = rcu_access_pointer(profile->parent)) | |
1438 | depth++; | |
1439 | rcu_read_unlock(); | |
1440 | ||
1441 | return depth; | |
1442 | } | |
1443 | ||
1444 | static int gen_symlink_name(char *buffer, size_t bsize, int depth, | |
1445 | const char *dirname, const char *fname) | |
1446 | { | |
1447 | int error; | |
1448 | ||
1449 | for (; depth > 0; depth--) { | |
1450 | if (bsize < 7) | |
1451 | return -ENAMETOOLONG; | |
1452 | strcpy(buffer, "../../"); | |
1453 | buffer += 6; | |
1454 | bsize -= 6; | |
1455 | } | |
1456 | ||
1457 | error = snprintf(buffer, bsize, "raw_data/%s/%s", dirname, fname); | |
1458 | if (error >= bsize || error < 0) | |
1459 | return -ENAMETOOLONG; | |
1460 | ||
1461 | return 0; | |
1462 | } | |
1463 | ||
1464 | /* | |
1465 | * Requires: @profile->ns->lock held | |
1466 | */ | |
c97204ba | 1467 | int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent) |
0d259f04 JJ |
1468 | { |
1469 | struct aa_profile *child; | |
1470 | struct dentry *dent = NULL, *dir; | |
1471 | int error; | |
1472 | ||
1473 | if (!parent) { | |
1474 | struct aa_profile *p; | |
1475 | p = aa_deref_parent(profile); | |
1476 | dent = prof_dir(p); | |
1477 | /* adding to parent that previously didn't have children */ | |
c961ee5f | 1478 | dent = aafs_create_dir("profiles", dent); |
0d259f04 JJ |
1479 | if (IS_ERR(dent)) |
1480 | goto fail; | |
1481 | prof_child_dir(p) = parent = dent; | |
1482 | } | |
1483 | ||
1484 | if (!profile->dirname) { | |
1485 | int len, id_len; | |
1486 | len = mangle_name(profile->base.name, NULL); | |
1487 | id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id); | |
1488 | ||
1489 | profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL); | |
ffac1de6 DC |
1490 | if (!profile->dirname) { |
1491 | error = -ENOMEM; | |
1492 | goto fail2; | |
1493 | } | |
0d259f04 JJ |
1494 | |
1495 | mangle_name(profile->base.name, profile->dirname); | |
1496 | sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++); | |
1497 | } | |
1498 | ||
c961ee5f | 1499 | dent = aafs_create_dir(profile->dirname, parent); |
0d259f04 JJ |
1500 | if (IS_ERR(dent)) |
1501 | goto fail; | |
1502 | prof_dir(profile) = dir = dent; | |
1503 | ||
52b97de3 JJ |
1504 | dent = create_profile_file(dir, "name", profile, |
1505 | &seq_profile_name_fops); | |
0d259f04 JJ |
1506 | if (IS_ERR(dent)) |
1507 | goto fail; | |
1508 | profile->dents[AAFS_PROF_NAME] = dent; | |
1509 | ||
52b97de3 JJ |
1510 | dent = create_profile_file(dir, "mode", profile, |
1511 | &seq_profile_mode_fops); | |
0d259f04 JJ |
1512 | if (IS_ERR(dent)) |
1513 | goto fail; | |
1514 | profile->dents[AAFS_PROF_MODE] = dent; | |
1515 | ||
556d0be7 | 1516 | dent = create_profile_file(dir, "attach", profile, |
52b97de3 | 1517 | &seq_profile_attach_fops); |
556d0be7 JJ |
1518 | if (IS_ERR(dent)) |
1519 | goto fail; | |
1520 | profile->dents[AAFS_PROF_ATTACH] = dent; | |
1521 | ||
f8eb8a13 JJ |
1522 | if (profile->hash) { |
1523 | dent = create_profile_file(dir, "sha1", profile, | |
52b97de3 | 1524 | &seq_profile_hash_fops); |
f8eb8a13 JJ |
1525 | if (IS_ERR(dent)) |
1526 | goto fail; | |
1527 | profile->dents[AAFS_PROF_HASH] = dent; | |
1528 | } | |
1529 | ||
5ac8c355 | 1530 | if (profile->rawdata) { |
5d5182ca JJ |
1531 | char target[64]; |
1532 | int depth = profile_depth(profile); | |
1533 | ||
1534 | error = gen_symlink_name(target, sizeof(target), depth, | |
1535 | profile->rawdata->name, "sha1"); | |
1536 | if (error < 0) | |
1537 | goto fail2; | |
c961ee5f | 1538 | dent = aafs_create_symlink("raw_sha1", dir, target, NULL); |
5ac8c355 JJ |
1539 | if (IS_ERR(dent)) |
1540 | goto fail; | |
1541 | profile->dents[AAFS_PROF_RAW_HASH] = dent; | |
1542 | ||
5d5182ca JJ |
1543 | error = gen_symlink_name(target, sizeof(target), depth, |
1544 | profile->rawdata->name, "abi"); | |
1545 | if (error < 0) | |
1546 | goto fail2; | |
c961ee5f | 1547 | dent = aafs_create_symlink("raw_abi", dir, target, NULL); |
5ac8c355 JJ |
1548 | if (IS_ERR(dent)) |
1549 | goto fail; | |
1550 | profile->dents[AAFS_PROF_RAW_ABI] = dent; | |
1551 | ||
5d5182ca JJ |
1552 | error = gen_symlink_name(target, sizeof(target), depth, |
1553 | profile->rawdata->name, "raw_data"); | |
1554 | if (error < 0) | |
1555 | goto fail2; | |
c961ee5f | 1556 | dent = aafs_create_symlink("raw_data", dir, target, NULL); |
5ac8c355 JJ |
1557 | if (IS_ERR(dent)) |
1558 | goto fail; | |
1559 | profile->dents[AAFS_PROF_RAW_DATA] = dent; | |
5ac8c355 JJ |
1560 | } |
1561 | ||
0d259f04 | 1562 | list_for_each_entry(child, &profile->base.profiles, base.list) { |
c97204ba | 1563 | error = __aafs_profile_mkdir(child, prof_child_dir(profile)); |
0d259f04 JJ |
1564 | if (error) |
1565 | goto fail2; | |
1566 | } | |
1567 | ||
1568 | return 0; | |
1569 | ||
1570 | fail: | |
1571 | error = PTR_ERR(dent); | |
1572 | ||
1573 | fail2: | |
c97204ba | 1574 | __aafs_profile_rmdir(profile); |
0d259f04 JJ |
1575 | |
1576 | return error; | |
1577 | } | |
1578 | ||
4ae47f33 JJ |
1579 | static int ns_mkdir_op(struct inode *dir, struct dentry *dentry, umode_t mode) |
1580 | { | |
1581 | struct aa_ns *ns, *parent; | |
1582 | /* TODO: improve permission check */ | |
637f688d JJ |
1583 | struct aa_label *label; |
1584 | int error; | |
1585 | ||
1586 | label = begin_current_label_crit_section(); | |
1587 | error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY); | |
1588 | end_current_label_crit_section(label); | |
4ae47f33 JJ |
1589 | if (error) |
1590 | return error; | |
1591 | ||
1592 | parent = aa_get_ns(dir->i_private); | |
1593 | AA_BUG(d_inode(ns_subns_dir(parent)) != dir); | |
1594 | ||
1595 | /* we have to unlock and then relock to get locking order right | |
1596 | * for pin_fs | |
1597 | */ | |
1598 | inode_unlock(dir); | |
1599 | error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count); | |
1600 | mutex_lock(&parent->lock); | |
1601 | inode_lock_nested(dir, I_MUTEX_PARENT); | |
1602 | if (error) | |
1603 | goto out; | |
1604 | ||
1605 | error = __aafs_setup_d_inode(dir, dentry, mode | S_IFDIR, NULL, | |
1606 | NULL, NULL, NULL); | |
1607 | if (error) | |
1608 | goto out_pin; | |
1609 | ||
1610 | ns = __aa_find_or_create_ns(parent, READ_ONCE(dentry->d_name.name), | |
1611 | dentry); | |
1612 | if (IS_ERR(ns)) { | |
1613 | error = PTR_ERR(ns); | |
1614 | ns = NULL; | |
1615 | } | |
1616 | ||
1617 | aa_put_ns(ns); /* list ref remains */ | |
1618 | out_pin: | |
1619 | if (error) | |
1620 | simple_release_fs(&aafs_mnt, &aafs_count); | |
1621 | out: | |
1622 | mutex_unlock(&parent->lock); | |
1623 | aa_put_ns(parent); | |
1624 | ||
1625 | return error; | |
1626 | } | |
1627 | ||
1628 | static int ns_rmdir_op(struct inode *dir, struct dentry *dentry) | |
1629 | { | |
1630 | struct aa_ns *ns, *parent; | |
1631 | /* TODO: improve permission check */ | |
637f688d JJ |
1632 | struct aa_label *label; |
1633 | int error; | |
1634 | ||
1635 | label = begin_current_label_crit_section(); | |
1636 | error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY); | |
1637 | end_current_label_crit_section(label); | |
4ae47f33 JJ |
1638 | if (error) |
1639 | return error; | |
1640 | ||
637f688d | 1641 | parent = aa_get_ns(dir->i_private); |
4ae47f33 JJ |
1642 | /* rmdir calls the generic securityfs functions to remove files |
1643 | * from the apparmor dir. It is up to the apparmor ns locking | |
1644 | * to avoid races. | |
1645 | */ | |
1646 | inode_unlock(dir); | |
1647 | inode_unlock(dentry->d_inode); | |
1648 | ||
1649 | mutex_lock(&parent->lock); | |
1650 | ns = aa_get_ns(__aa_findn_ns(&parent->sub_ns, dentry->d_name.name, | |
1651 | dentry->d_name.len)); | |
1652 | if (!ns) { | |
1653 | error = -ENOENT; | |
1654 | goto out; | |
1655 | } | |
1656 | AA_BUG(ns_dir(ns) != dentry); | |
1657 | ||
1658 | __aa_remove_ns(ns); | |
1659 | aa_put_ns(ns); | |
1660 | ||
1661 | out: | |
1662 | mutex_unlock(&parent->lock); | |
1663 | inode_lock_nested(dir, I_MUTEX_PARENT); | |
1664 | inode_lock(dentry->d_inode); | |
1665 | aa_put_ns(parent); | |
1666 | ||
1667 | return error; | |
1668 | } | |
1669 | ||
1670 | static const struct inode_operations ns_dir_inode_operations = { | |
1671 | .lookup = simple_lookup, | |
1672 | .mkdir = ns_mkdir_op, | |
1673 | .rmdir = ns_rmdir_op, | |
1674 | }; | |
1675 | ||
5d5182ca JJ |
1676 | static void __aa_fs_list_remove_rawdata(struct aa_ns *ns) |
1677 | { | |
1678 | struct aa_loaddata *ent, *tmp; | |
1679 | ||
1680 | AA_BUG(!mutex_is_locked(&ns->lock)); | |
1681 | ||
1682 | list_for_each_entry_safe(ent, tmp, &ns->rawdata_list, list) | |
1683 | __aa_fs_remove_rawdata(ent); | |
1684 | } | |
1685 | ||
c97204ba JJ |
1686 | /** |
1687 | * | |
1688 | * Requires: @ns->lock held | |
1689 | */ | |
1690 | void __aafs_ns_rmdir(struct aa_ns *ns) | |
0d259f04 | 1691 | { |
98849dff | 1692 | struct aa_ns *sub; |
0d259f04 JJ |
1693 | struct aa_profile *child; |
1694 | int i; | |
1695 | ||
1696 | if (!ns) | |
1697 | return; | |
1698 | ||
1699 | list_for_each_entry(child, &ns->base.profiles, base.list) | |
c97204ba | 1700 | __aafs_profile_rmdir(child); |
0d259f04 JJ |
1701 | |
1702 | list_for_each_entry(sub, &ns->sub_ns, base.list) { | |
1703 | mutex_lock(&sub->lock); | |
c97204ba | 1704 | __aafs_ns_rmdir(sub); |
0d259f04 JJ |
1705 | mutex_unlock(&sub->lock); |
1706 | } | |
1707 | ||
5d5182ca JJ |
1708 | __aa_fs_list_remove_rawdata(ns); |
1709 | ||
b7fd2c03 JJ |
1710 | if (ns_subns_dir(ns)) { |
1711 | sub = d_inode(ns_subns_dir(ns))->i_private; | |
1712 | aa_put_ns(sub); | |
1713 | } | |
1714 | if (ns_subload(ns)) { | |
1715 | sub = d_inode(ns_subload(ns))->i_private; | |
1716 | aa_put_ns(sub); | |
1717 | } | |
1718 | if (ns_subreplace(ns)) { | |
1719 | sub = d_inode(ns_subreplace(ns))->i_private; | |
1720 | aa_put_ns(sub); | |
1721 | } | |
1722 | if (ns_subremove(ns)) { | |
1723 | sub = d_inode(ns_subremove(ns))->i_private; | |
1724 | aa_put_ns(sub); | |
1725 | } | |
d9bf2c26 JJ |
1726 | if (ns_subrevision(ns)) { |
1727 | sub = d_inode(ns_subrevision(ns))->i_private; | |
1728 | aa_put_ns(sub); | |
1729 | } | |
b7fd2c03 | 1730 | |
0d259f04 | 1731 | for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) { |
c961ee5f | 1732 | aafs_remove(ns->dents[i]); |
0d259f04 JJ |
1733 | ns->dents[i] = NULL; |
1734 | } | |
1735 | } | |
1736 | ||
b7fd2c03 | 1737 | /* assumes cleanup in caller */ |
c97204ba | 1738 | static int __aafs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir) |
b7fd2c03 JJ |
1739 | { |
1740 | struct dentry *dent; | |
1741 | ||
1742 | AA_BUG(!ns); | |
1743 | AA_BUG(!dir); | |
1744 | ||
c961ee5f | 1745 | dent = aafs_create_dir("profiles", dir); |
b7fd2c03 JJ |
1746 | if (IS_ERR(dent)) |
1747 | return PTR_ERR(dent); | |
1748 | ns_subprofs_dir(ns) = dent; | |
1749 | ||
c961ee5f | 1750 | dent = aafs_create_dir("raw_data", dir); |
b7fd2c03 JJ |
1751 | if (IS_ERR(dent)) |
1752 | return PTR_ERR(dent); | |
1753 | ns_subdata_dir(ns) = dent; | |
1754 | ||
d9bf2c26 JJ |
1755 | dent = aafs_create_file("revision", 0444, dir, ns, |
1756 | &aa_fs_ns_revision_fops); | |
1757 | if (IS_ERR(dent)) | |
1758 | return PTR_ERR(dent); | |
1759 | aa_get_ns(ns); | |
1760 | ns_subrevision(ns) = dent; | |
1761 | ||
c961ee5f | 1762 | dent = aafs_create_file(".load", 0640, dir, ns, |
b7fd2c03 JJ |
1763 | &aa_fs_profile_load); |
1764 | if (IS_ERR(dent)) | |
1765 | return PTR_ERR(dent); | |
1766 | aa_get_ns(ns); | |
1767 | ns_subload(ns) = dent; | |
1768 | ||
c961ee5f | 1769 | dent = aafs_create_file(".replace", 0640, dir, ns, |
b7fd2c03 JJ |
1770 | &aa_fs_profile_replace); |
1771 | if (IS_ERR(dent)) | |
1772 | return PTR_ERR(dent); | |
1773 | aa_get_ns(ns); | |
1774 | ns_subreplace(ns) = dent; | |
1775 | ||
c961ee5f | 1776 | dent = aafs_create_file(".remove", 0640, dir, ns, |
b7fd2c03 JJ |
1777 | &aa_fs_profile_remove); |
1778 | if (IS_ERR(dent)) | |
1779 | return PTR_ERR(dent); | |
1780 | aa_get_ns(ns); | |
1781 | ns_subremove(ns) = dent; | |
1782 | ||
4ae47f33 JJ |
1783 | /* use create_dentry so we can supply private data */ |
1784 | dent = aafs_create("namespaces", S_IFDIR | 0755, dir, ns, NULL, NULL, | |
1785 | &ns_dir_inode_operations); | |
b7fd2c03 JJ |
1786 | if (IS_ERR(dent)) |
1787 | return PTR_ERR(dent); | |
1788 | aa_get_ns(ns); | |
1789 | ns_subns_dir(ns) = dent; | |
1790 | ||
1791 | return 0; | |
1792 | } | |
1793 | ||
c97204ba JJ |
1794 | /* |
1795 | * Requires: @ns->lock held | |
1796 | */ | |
98407f0a JJ |
1797 | int __aafs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name, |
1798 | struct dentry *dent) | |
0d259f04 | 1799 | { |
98849dff | 1800 | struct aa_ns *sub; |
0d259f04 | 1801 | struct aa_profile *child; |
98407f0a | 1802 | struct dentry *dir; |
0d259f04 JJ |
1803 | int error; |
1804 | ||
b7fd2c03 JJ |
1805 | AA_BUG(!ns); |
1806 | AA_BUG(!parent); | |
1807 | AA_BUG(!mutex_is_locked(&ns->lock)); | |
1808 | ||
0d259f04 JJ |
1809 | if (!name) |
1810 | name = ns->base.name; | |
1811 | ||
c961ee5f JJ |
1812 | if (!dent) { |
1813 | /* create ns dir if it doesn't already exist */ | |
1814 | dent = aafs_create_dir(name, parent); | |
1815 | if (IS_ERR(dent)) | |
1816 | goto fail; | |
1817 | } else | |
1818 | dget(dent); | |
b7fd2c03 | 1819 | ns_dir(ns) = dir = dent; |
c97204ba | 1820 | error = __aafs_ns_mkdir_entries(ns, dir); |
b7fd2c03 JJ |
1821 | if (error) |
1822 | goto fail2; | |
0d259f04 | 1823 | |
b7fd2c03 | 1824 | /* profiles */ |
0d259f04 | 1825 | list_for_each_entry(child, &ns->base.profiles, base.list) { |
c97204ba | 1826 | error = __aafs_profile_mkdir(child, ns_subprofs_dir(ns)); |
0d259f04 JJ |
1827 | if (error) |
1828 | goto fail2; | |
1829 | } | |
1830 | ||
b7fd2c03 | 1831 | /* subnamespaces */ |
0d259f04 JJ |
1832 | list_for_each_entry(sub, &ns->sub_ns, base.list) { |
1833 | mutex_lock(&sub->lock); | |
98407f0a | 1834 | error = __aafs_ns_mkdir(sub, ns_subns_dir(ns), NULL, NULL); |
0d259f04 JJ |
1835 | mutex_unlock(&sub->lock); |
1836 | if (error) | |
1837 | goto fail2; | |
1838 | } | |
1839 | ||
1840 | return 0; | |
1841 | ||
1842 | fail: | |
1843 | error = PTR_ERR(dent); | |
1844 | ||
1845 | fail2: | |
c97204ba | 1846 | __aafs_ns_rmdir(ns); |
0d259f04 JJ |
1847 | |
1848 | return error; | |
1849 | } | |
1850 | ||
1851 | ||
29b3822f JJ |
1852 | #define list_entry_is_head(pos, head, member) (&pos->member == (head)) |
1853 | ||
1854 | /** | |
98849dff | 1855 | * __next_ns - find the next namespace to list |
29b3822f JJ |
1856 | * @root: root namespace to stop search at (NOT NULL) |
1857 | * @ns: current ns position (NOT NULL) | |
1858 | * | |
1859 | * Find the next namespace from @ns under @root and handle all locking needed | |
1860 | * while switching current namespace. | |
1861 | * | |
1862 | * Returns: next namespace or NULL if at last namespace under @root | |
1863 | * Requires: ns->parent->lock to be held | |
1864 | * NOTE: will not unlock root->lock | |
1865 | */ | |
98849dff | 1866 | static struct aa_ns *__next_ns(struct aa_ns *root, struct aa_ns *ns) |
29b3822f | 1867 | { |
98849dff | 1868 | struct aa_ns *parent, *next; |
29b3822f JJ |
1869 | |
1870 | /* is next namespace a child */ | |
1871 | if (!list_empty(&ns->sub_ns)) { | |
1872 | next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list); | |
1873 | mutex_lock(&next->lock); | |
1874 | return next; | |
1875 | } | |
1876 | ||
1877 | /* check if the next ns is a sibling, parent, gp, .. */ | |
1878 | parent = ns->parent; | |
ed2c7da3 | 1879 | while (ns != root) { |
29b3822f | 1880 | mutex_unlock(&ns->lock); |
38dbd7d8 | 1881 | next = list_next_entry(ns, base.list); |
29b3822f JJ |
1882 | if (!list_entry_is_head(next, &parent->sub_ns, base.list)) { |
1883 | mutex_lock(&next->lock); | |
1884 | return next; | |
1885 | } | |
29b3822f JJ |
1886 | ns = parent; |
1887 | parent = parent->parent; | |
1888 | } | |
1889 | ||
1890 | return NULL; | |
1891 | } | |
1892 | ||
1893 | /** | |
1894 | * __first_profile - find the first profile in a namespace | |
1895 | * @root: namespace that is root of profiles being displayed (NOT NULL) | |
1896 | * @ns: namespace to start in (NOT NULL) | |
1897 | * | |
1898 | * Returns: unrefcounted profile or NULL if no profile | |
1899 | * Requires: profile->ns.lock to be held | |
1900 | */ | |
98849dff JJ |
1901 | static struct aa_profile *__first_profile(struct aa_ns *root, |
1902 | struct aa_ns *ns) | |
29b3822f | 1903 | { |
98849dff | 1904 | for (; ns; ns = __next_ns(root, ns)) { |
29b3822f JJ |
1905 | if (!list_empty(&ns->base.profiles)) |
1906 | return list_first_entry(&ns->base.profiles, | |
1907 | struct aa_profile, base.list); | |
1908 | } | |
1909 | return NULL; | |
1910 | } | |
1911 | ||
1912 | /** | |
1913 | * __next_profile - step to the next profile in a profile tree | |
1914 | * @profile: current profile in tree (NOT NULL) | |
1915 | * | |
1916 | * Perform a depth first traversal on the profile tree in a namespace | |
1917 | * | |
1918 | * Returns: next profile or NULL if done | |
1919 | * Requires: profile->ns.lock to be held | |
1920 | */ | |
1921 | static struct aa_profile *__next_profile(struct aa_profile *p) | |
1922 | { | |
1923 | struct aa_profile *parent; | |
98849dff | 1924 | struct aa_ns *ns = p->ns; |
29b3822f JJ |
1925 | |
1926 | /* is next profile a child */ | |
1927 | if (!list_empty(&p->base.profiles)) | |
1928 | return list_first_entry(&p->base.profiles, typeof(*p), | |
1929 | base.list); | |
1930 | ||
1931 | /* is next profile a sibling, parent sibling, gp, sibling, .. */ | |
1932 | parent = rcu_dereference_protected(p->parent, | |
1933 | mutex_is_locked(&p->ns->lock)); | |
1934 | while (parent) { | |
38dbd7d8 | 1935 | p = list_next_entry(p, base.list); |
29b3822f JJ |
1936 | if (!list_entry_is_head(p, &parent->base.profiles, base.list)) |
1937 | return p; | |
1938 | p = parent; | |
1939 | parent = rcu_dereference_protected(parent->parent, | |
1940 | mutex_is_locked(&parent->ns->lock)); | |
1941 | } | |
1942 | ||
1943 | /* is next another profile in the namespace */ | |
38dbd7d8 | 1944 | p = list_next_entry(p, base.list); |
29b3822f JJ |
1945 | if (!list_entry_is_head(p, &ns->base.profiles, base.list)) |
1946 | return p; | |
1947 | ||
1948 | return NULL; | |
1949 | } | |
1950 | ||
1951 | /** | |
1952 | * next_profile - step to the next profile in where ever it may be | |
1953 | * @root: root namespace (NOT NULL) | |
1954 | * @profile: current profile (NOT NULL) | |
1955 | * | |
1956 | * Returns: next profile or NULL if there isn't one | |
1957 | */ | |
98849dff | 1958 | static struct aa_profile *next_profile(struct aa_ns *root, |
29b3822f JJ |
1959 | struct aa_profile *profile) |
1960 | { | |
1961 | struct aa_profile *next = __next_profile(profile); | |
1962 | if (next) | |
1963 | return next; | |
1964 | ||
1965 | /* finished all profiles in namespace move to next namespace */ | |
98849dff | 1966 | return __first_profile(root, __next_ns(root, profile->ns)); |
29b3822f JJ |
1967 | } |
1968 | ||
1969 | /** | |
1970 | * p_start - start a depth first traversal of profile tree | |
1971 | * @f: seq_file to fill | |
1972 | * @pos: current position | |
1973 | * | |
1974 | * Returns: first profile under current namespace or NULL if none found | |
1975 | * | |
1976 | * acquires first ns->lock | |
1977 | */ | |
1978 | static void *p_start(struct seq_file *f, loff_t *pos) | |
1979 | { | |
1980 | struct aa_profile *profile = NULL; | |
cf797c0e | 1981 | struct aa_ns *root = aa_get_current_ns(); |
29b3822f | 1982 | loff_t l = *pos; |
cf797c0e | 1983 | f->private = root; |
29b3822f JJ |
1984 | |
1985 | /* find the first profile */ | |
1986 | mutex_lock(&root->lock); | |
1987 | profile = __first_profile(root, root); | |
1988 | ||
1989 | /* skip to position */ | |
1990 | for (; profile && l > 0; l--) | |
1991 | profile = next_profile(root, profile); | |
1992 | ||
1993 | return profile; | |
1994 | } | |
1995 | ||
1996 | /** | |
1997 | * p_next - read the next profile entry | |
1998 | * @f: seq_file to fill | |
1999 | * @p: profile previously returned | |
2000 | * @pos: current position | |
2001 | * | |
2002 | * Returns: next profile after @p or NULL if none | |
2003 | * | |
2004 | * may acquire/release locks in namespace tree as necessary | |
2005 | */ | |
2006 | static void *p_next(struct seq_file *f, void *p, loff_t *pos) | |
2007 | { | |
2008 | struct aa_profile *profile = p; | |
98849dff | 2009 | struct aa_ns *ns = f->private; |
29b3822f JJ |
2010 | (*pos)++; |
2011 | ||
2012 | return next_profile(ns, profile); | |
2013 | } | |
2014 | ||
2015 | /** | |
2016 | * p_stop - stop depth first traversal | |
2017 | * @f: seq_file we are filling | |
2018 | * @p: the last profile writen | |
2019 | * | |
2020 | * Release all locking done by p_start/p_next on namespace tree | |
2021 | */ | |
2022 | static void p_stop(struct seq_file *f, void *p) | |
2023 | { | |
2024 | struct aa_profile *profile = p; | |
98849dff | 2025 | struct aa_ns *root = f->private, *ns; |
29b3822f JJ |
2026 | |
2027 | if (profile) { | |
2028 | for (ns = profile->ns; ns && ns != root; ns = ns->parent) | |
2029 | mutex_unlock(&ns->lock); | |
2030 | } | |
2031 | mutex_unlock(&root->lock); | |
98849dff | 2032 | aa_put_ns(root); |
29b3822f JJ |
2033 | } |
2034 | ||
2035 | /** | |
2036 | * seq_show_profile - show a profile entry | |
2037 | * @f: seq_file to file | |
2038 | * @p: current position (profile) (NOT NULL) | |
2039 | * | |
2040 | * Returns: error on failure | |
2041 | */ | |
2042 | static int seq_show_profile(struct seq_file *f, void *p) | |
2043 | { | |
2044 | struct aa_profile *profile = (struct aa_profile *)p; | |
98849dff | 2045 | struct aa_ns *root = f->private; |
29b3822f | 2046 | |
637f688d JJ |
2047 | aa_label_seq_xprint(f, root, &profile->label, |
2048 | FLAG_SHOW_MODE | FLAG_VIEW_SUBNS, GFP_KERNEL); | |
2049 | seq_putc(f, '\n'); | |
29b3822f JJ |
2050 | |
2051 | return 0; | |
2052 | } | |
2053 | ||
c97204ba | 2054 | static const struct seq_operations aa_sfs_profiles_op = { |
29b3822f JJ |
2055 | .start = p_start, |
2056 | .next = p_next, | |
2057 | .stop = p_stop, | |
2058 | .show = seq_show_profile, | |
2059 | }; | |
2060 | ||
2061 | static int profiles_open(struct inode *inode, struct file *file) | |
2062 | { | |
5ac8c355 JJ |
2063 | if (!policy_view_capable(NULL)) |
2064 | return -EACCES; | |
2065 | ||
c97204ba | 2066 | return seq_open(file, &aa_sfs_profiles_op); |
29b3822f JJ |
2067 | } |
2068 | ||
2069 | static int profiles_release(struct inode *inode, struct file *file) | |
2070 | { | |
2071 | return seq_release(inode, file); | |
2072 | } | |
2073 | ||
c97204ba | 2074 | static const struct file_operations aa_sfs_profiles_fops = { |
29b3822f JJ |
2075 | .open = profiles_open, |
2076 | .read = seq_read, | |
2077 | .llseek = seq_lseek, | |
2078 | .release = profiles_release, | |
2079 | }; | |
2080 | ||
2081 | ||
0d259f04 | 2082 | /** Base file system setup **/ |
c97204ba JJ |
2083 | static struct aa_sfs_entry aa_sfs_entry_file[] = { |
2084 | AA_SFS_FILE_STRING("mask", | |
2085 | "create read write exec append mmap_exec link lock"), | |
a9bf8e9f KC |
2086 | { } |
2087 | }; | |
2088 | ||
290f458a JJ |
2089 | static struct aa_sfs_entry aa_sfs_entry_ptrace[] = { |
2090 | AA_SFS_FILE_STRING("mask", "read trace"), | |
2091 | { } | |
2092 | }; | |
2093 | ||
c97204ba JJ |
2094 | static struct aa_sfs_entry aa_sfs_entry_domain[] = { |
2095 | AA_SFS_FILE_BOOLEAN("change_hat", 1), | |
2096 | AA_SFS_FILE_BOOLEAN("change_hatv", 1), | |
2097 | AA_SFS_FILE_BOOLEAN("change_onexec", 1), | |
2098 | AA_SFS_FILE_BOOLEAN("change_profile", 1), | |
2099 | AA_SFS_FILE_BOOLEAN("fix_binfmt_elf_mmap", 1), | |
2100 | AA_SFS_FILE_STRING("version", "1.2"), | |
e74abcf3 KC |
2101 | { } |
2102 | }; | |
2103 | ||
c97204ba JJ |
2104 | static struct aa_sfs_entry aa_sfs_entry_versions[] = { |
2105 | AA_SFS_FILE_BOOLEAN("v5", 1), | |
5379a331 JJ |
2106 | AA_SFS_FILE_BOOLEAN("v6", 1), |
2107 | AA_SFS_FILE_BOOLEAN("v7", 1), | |
474d6b75 JJ |
2108 | { } |
2109 | }; | |
2110 | ||
c97204ba JJ |
2111 | static struct aa_sfs_entry aa_sfs_entry_policy[] = { |
2112 | AA_SFS_DIR("versions", aa_sfs_entry_versions), | |
2113 | AA_SFS_FILE_BOOLEAN("set_load", 1), | |
474d6b75 | 2114 | { } |
9d910a3b JJ |
2115 | }; |
2116 | ||
a83bd86e | 2117 | static struct aa_sfs_entry aa_sfs_entry_query_label[] = { |
4f3b3f2d | 2118 | AA_SFS_FILE_STRING("perms", "allow deny audit quiet"), |
a83bd86e | 2119 | AA_SFS_FILE_BOOLEAN("data", 1), |
1dea3b41 | 2120 | AA_SFS_FILE_BOOLEAN("multi_transaction", 1), |
a83bd86e JJ |
2121 | { } |
2122 | }; | |
2123 | ||
2124 | static struct aa_sfs_entry aa_sfs_entry_query[] = { | |
2125 | AA_SFS_DIR("label", aa_sfs_entry_query_label), | |
2126 | { } | |
2127 | }; | |
c97204ba JJ |
2128 | static struct aa_sfs_entry aa_sfs_entry_features[] = { |
2129 | AA_SFS_DIR("policy", aa_sfs_entry_policy), | |
2130 | AA_SFS_DIR("domain", aa_sfs_entry_domain), | |
2131 | AA_SFS_DIR("file", aa_sfs_entry_file), | |
2132 | AA_SFS_FILE_U64("capability", VFS_CAP_FLAGS_MASK), | |
2133 | AA_SFS_DIR("rlimit", aa_sfs_entry_rlimit), | |
2134 | AA_SFS_DIR("caps", aa_sfs_entry_caps), | |
290f458a | 2135 | AA_SFS_DIR("ptrace", aa_sfs_entry_ptrace), |
a83bd86e | 2136 | AA_SFS_DIR("query", aa_sfs_entry_query), |
e74abcf3 KC |
2137 | { } |
2138 | }; | |
2139 | ||
c97204ba JJ |
2140 | static struct aa_sfs_entry aa_sfs_entry_apparmor[] = { |
2141 | AA_SFS_FILE_FOPS(".access", 0640, &aa_sfs_access), | |
2142 | AA_SFS_FILE_FOPS(".ns_level", 0666, &seq_ns_level_fops), | |
2143 | AA_SFS_FILE_FOPS(".ns_name", 0640, &seq_ns_name_fops), | |
2144 | AA_SFS_FILE_FOPS("profiles", 0440, &aa_sfs_profiles_fops), | |
2145 | AA_SFS_DIR("features", aa_sfs_entry_features), | |
9acd494b KC |
2146 | { } |
2147 | }; | |
63e2b423 | 2148 | |
c97204ba JJ |
2149 | static struct aa_sfs_entry aa_sfs_entry = |
2150 | AA_SFS_DIR("apparmor", aa_sfs_entry_apparmor); | |
63e2b423 | 2151 | |
9acd494b | 2152 | /** |
a481f4d9 | 2153 | * entry_create_file - create a file entry in the apparmor securityfs |
c97204ba | 2154 | * @fs_file: aa_sfs_entry to build an entry for (NOT NULL) |
9acd494b KC |
2155 | * @parent: the parent dentry in the securityfs |
2156 | * | |
a481f4d9 | 2157 | * Use entry_remove_file to remove entries created with this fn. |
9acd494b | 2158 | */ |
c97204ba | 2159 | static int __init entry_create_file(struct aa_sfs_entry *fs_file, |
a481f4d9 | 2160 | struct dentry *parent) |
9acd494b KC |
2161 | { |
2162 | int error = 0; | |
2163 | ||
2164 | fs_file->dentry = securityfs_create_file(fs_file->name, | |
2165 | S_IFREG | fs_file->mode, | |
2166 | parent, fs_file, | |
2167 | fs_file->file_ops); | |
2168 | if (IS_ERR(fs_file->dentry)) { | |
2169 | error = PTR_ERR(fs_file->dentry); | |
2170 | fs_file->dentry = NULL; | |
63e2b423 | 2171 | } |
9acd494b | 2172 | return error; |
63e2b423 JJ |
2173 | } |
2174 | ||
c97204ba | 2175 | static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir); |
63e2b423 | 2176 | /** |
a481f4d9 | 2177 | * entry_create_dir - recursively create a directory entry in the securityfs |
c97204ba | 2178 | * @fs_dir: aa_sfs_entry (and all child entries) to build (NOT NULL) |
9acd494b | 2179 | * @parent: the parent dentry in the securityfs |
63e2b423 | 2180 | * |
a481f4d9 | 2181 | * Use entry_remove_dir to remove entries created with this fn. |
63e2b423 | 2182 | */ |
c97204ba JJ |
2183 | static int __init entry_create_dir(struct aa_sfs_entry *fs_dir, |
2184 | struct dentry *parent) | |
63e2b423 | 2185 | { |
c97204ba | 2186 | struct aa_sfs_entry *fs_file; |
0d259f04 JJ |
2187 | struct dentry *dir; |
2188 | int error; | |
63e2b423 | 2189 | |
0d259f04 JJ |
2190 | dir = securityfs_create_dir(fs_dir->name, parent); |
2191 | if (IS_ERR(dir)) | |
2192 | return PTR_ERR(dir); | |
2193 | fs_dir->dentry = dir; | |
63e2b423 | 2194 | |
0d259f04 | 2195 | for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) { |
c97204ba | 2196 | if (fs_file->v_type == AA_SFS_TYPE_DIR) |
a481f4d9 | 2197 | error = entry_create_dir(fs_file, fs_dir->dentry); |
9acd494b | 2198 | else |
a481f4d9 | 2199 | error = entry_create_file(fs_file, fs_dir->dentry); |
9acd494b KC |
2200 | if (error) |
2201 | goto failed; | |
2202 | } | |
2203 | ||
2204 | return 0; | |
2205 | ||
2206 | failed: | |
a481f4d9 | 2207 | entry_remove_dir(fs_dir); |
0d259f04 | 2208 | |
9acd494b KC |
2209 | return error; |
2210 | } | |
2211 | ||
2212 | /** | |
c97204ba JJ |
2213 | * entry_remove_file - drop a single file entry in the apparmor securityfs |
2214 | * @fs_file: aa_sfs_entry to detach from the securityfs (NOT NULL) | |
9acd494b | 2215 | */ |
c97204ba | 2216 | static void __init entry_remove_file(struct aa_sfs_entry *fs_file) |
9acd494b KC |
2217 | { |
2218 | if (!fs_file->dentry) | |
2219 | return; | |
2220 | ||
2221 | securityfs_remove(fs_file->dentry); | |
2222 | fs_file->dentry = NULL; | |
2223 | } | |
2224 | ||
2225 | /** | |
a481f4d9 | 2226 | * entry_remove_dir - recursively drop a directory entry from the securityfs |
c97204ba | 2227 | * @fs_dir: aa_sfs_entry (and all child entries) to detach (NOT NULL) |
9acd494b | 2228 | */ |
c97204ba | 2229 | static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir) |
9acd494b | 2230 | { |
c97204ba | 2231 | struct aa_sfs_entry *fs_file; |
9acd494b | 2232 | |
0d259f04 | 2233 | for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) { |
c97204ba | 2234 | if (fs_file->v_type == AA_SFS_TYPE_DIR) |
a481f4d9 | 2235 | entry_remove_dir(fs_file); |
9acd494b | 2236 | else |
c97204ba | 2237 | entry_remove_file(fs_file); |
9acd494b KC |
2238 | } |
2239 | ||
c97204ba | 2240 | entry_remove_file(fs_dir); |
63e2b423 JJ |
2241 | } |
2242 | ||
2243 | /** | |
2244 | * aa_destroy_aafs - cleanup and free aafs | |
2245 | * | |
2246 | * releases dentries allocated by aa_create_aafs | |
2247 | */ | |
2248 | void __init aa_destroy_aafs(void) | |
2249 | { | |
c97204ba | 2250 | entry_remove_dir(&aa_sfs_entry); |
63e2b423 JJ |
2251 | } |
2252 | ||
a71ada30 JJ |
2253 | |
2254 | #define NULL_FILE_NAME ".null" | |
2255 | struct path aa_null; | |
2256 | ||
2257 | static int aa_mk_null_file(struct dentry *parent) | |
2258 | { | |
2259 | struct vfsmount *mount = NULL; | |
2260 | struct dentry *dentry; | |
2261 | struct inode *inode; | |
2262 | int count = 0; | |
2263 | int error = simple_pin_fs(parent->d_sb->s_type, &mount, &count); | |
2264 | ||
2265 | if (error) | |
2266 | return error; | |
2267 | ||
2268 | inode_lock(d_inode(parent)); | |
2269 | dentry = lookup_one_len(NULL_FILE_NAME, parent, strlen(NULL_FILE_NAME)); | |
2270 | if (IS_ERR(dentry)) { | |
2271 | error = PTR_ERR(dentry); | |
2272 | goto out; | |
2273 | } | |
2274 | inode = new_inode(parent->d_inode->i_sb); | |
2275 | if (!inode) { | |
2276 | error = -ENOMEM; | |
2277 | goto out1; | |
2278 | } | |
2279 | ||
2280 | inode->i_ino = get_next_ino(); | |
2281 | inode->i_mode = S_IFCHR | S_IRUGO | S_IWUGO; | |
24d0d03c | 2282 | inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
a71ada30 JJ |
2283 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, |
2284 | MKDEV(MEM_MAJOR, 3)); | |
2285 | d_instantiate(dentry, inode); | |
2286 | aa_null.dentry = dget(dentry); | |
2287 | aa_null.mnt = mntget(mount); | |
2288 | ||
2289 | error = 0; | |
2290 | ||
2291 | out1: | |
2292 | dput(dentry); | |
2293 | out: | |
2294 | inode_unlock(d_inode(parent)); | |
2295 | simple_release_fs(&mount, &count); | |
2296 | return error; | |
2297 | } | |
2298 | ||
a481f4d9 JJ |
2299 | |
2300 | ||
2301 | static const char *policy_get_link(struct dentry *dentry, | |
2302 | struct inode *inode, | |
2303 | struct delayed_call *done) | |
2304 | { | |
2305 | struct aa_ns *ns; | |
2306 | struct path path; | |
2307 | ||
2308 | if (!dentry) | |
2309 | return ERR_PTR(-ECHILD); | |
2310 | ns = aa_get_current_ns(); | |
2311 | path.mnt = mntget(aafs_mnt); | |
2312 | path.dentry = dget(ns_dir(ns)); | |
2313 | nd_jump_link(&path); | |
2314 | aa_put_ns(ns); | |
2315 | ||
2316 | return NULL; | |
2317 | } | |
2318 | ||
2319 | static int ns_get_name(char *buf, size_t size, struct aa_ns *ns, | |
2320 | struct inode *inode) | |
2321 | { | |
2322 | int res = snprintf(buf, size, "%s:[%lu]", AAFS_NAME, inode->i_ino); | |
2323 | ||
2324 | if (res < 0 || res >= size) | |
2325 | res = -ENOENT; | |
2326 | ||
2327 | return res; | |
2328 | } | |
2329 | ||
2330 | static int policy_readlink(struct dentry *dentry, char __user *buffer, | |
2331 | int buflen) | |
2332 | { | |
2333 | struct aa_ns *ns; | |
2334 | char name[32]; | |
2335 | int res; | |
2336 | ||
2337 | ns = aa_get_current_ns(); | |
2338 | res = ns_get_name(name, sizeof(name), ns, d_inode(dentry)); | |
2339 | if (res >= 0) | |
2340 | res = readlink_copy(buffer, buflen, name); | |
2341 | aa_put_ns(ns); | |
2342 | ||
2343 | return res; | |
2344 | } | |
2345 | ||
2346 | static const struct inode_operations policy_link_iops = { | |
2347 | .readlink = policy_readlink, | |
2348 | .get_link = policy_get_link, | |
2349 | }; | |
2350 | ||
2351 | ||
63e2b423 JJ |
2352 | /** |
2353 | * aa_create_aafs - create the apparmor security filesystem | |
2354 | * | |
2355 | * dentries created here are released by aa_destroy_aafs | |
2356 | * | |
2357 | * Returns: error on failure | |
2358 | */ | |
3417d8d5 | 2359 | static int __init aa_create_aafs(void) |
63e2b423 | 2360 | { |
b7fd2c03 | 2361 | struct dentry *dent; |
63e2b423 JJ |
2362 | int error; |
2363 | ||
2364 | if (!apparmor_initialized) | |
2365 | return 0; | |
2366 | ||
c97204ba | 2367 | if (aa_sfs_entry.dentry) { |
63e2b423 JJ |
2368 | AA_ERROR("%s: AppArmor securityfs already exists\n", __func__); |
2369 | return -EEXIST; | |
2370 | } | |
2371 | ||
a481f4d9 JJ |
2372 | /* setup apparmorfs used to virtualize policy/ */ |
2373 | aafs_mnt = kern_mount(&aafs_ops); | |
2374 | if (IS_ERR(aafs_mnt)) | |
2375 | panic("can't set apparmorfs up\n"); | |
2376 | aafs_mnt->mnt_sb->s_flags &= ~MS_NOUSER; | |
2377 | ||
9acd494b | 2378 | /* Populate fs tree. */ |
c97204ba | 2379 | error = entry_create_dir(&aa_sfs_entry, NULL); |
63e2b423 JJ |
2380 | if (error) |
2381 | goto error; | |
2382 | ||
c97204ba | 2383 | dent = securityfs_create_file(".load", 0666, aa_sfs_entry.dentry, |
b7fd2c03 JJ |
2384 | NULL, &aa_fs_profile_load); |
2385 | if (IS_ERR(dent)) { | |
2386 | error = PTR_ERR(dent); | |
2387 | goto error; | |
2388 | } | |
2389 | ns_subload(root_ns) = dent; | |
2390 | ||
c97204ba | 2391 | dent = securityfs_create_file(".replace", 0666, aa_sfs_entry.dentry, |
b7fd2c03 JJ |
2392 | NULL, &aa_fs_profile_replace); |
2393 | if (IS_ERR(dent)) { | |
2394 | error = PTR_ERR(dent); | |
2395 | goto error; | |
2396 | } | |
2397 | ns_subreplace(root_ns) = dent; | |
2398 | ||
c97204ba | 2399 | dent = securityfs_create_file(".remove", 0666, aa_sfs_entry.dentry, |
b7fd2c03 JJ |
2400 | NULL, &aa_fs_profile_remove); |
2401 | if (IS_ERR(dent)) { | |
2402 | error = PTR_ERR(dent); | |
2403 | goto error; | |
2404 | } | |
2405 | ns_subremove(root_ns) = dent; | |
2406 | ||
d9bf2c26 JJ |
2407 | dent = securityfs_create_file("revision", 0444, aa_sfs_entry.dentry, |
2408 | NULL, &aa_fs_ns_revision_fops); | |
2409 | if (IS_ERR(dent)) { | |
2410 | error = PTR_ERR(dent); | |
2411 | goto error; | |
2412 | } | |
2413 | ns_subrevision(root_ns) = dent; | |
2414 | ||
2415 | /* policy tree referenced by magic policy symlink */ | |
b7fd2c03 | 2416 | mutex_lock(&root_ns->lock); |
c961ee5f JJ |
2417 | error = __aafs_ns_mkdir(root_ns, aafs_mnt->mnt_root, ".policy", |
2418 | aafs_mnt->mnt_root); | |
b7fd2c03 | 2419 | mutex_unlock(&root_ns->lock); |
0d259f04 JJ |
2420 | if (error) |
2421 | goto error; | |
2422 | ||
c961ee5f JJ |
2423 | /* magic symlink similar to nsfs redirects based on task policy */ |
2424 | dent = securityfs_create_symlink("policy", aa_sfs_entry.dentry, | |
2425 | NULL, &policy_link_iops); | |
2426 | if (IS_ERR(dent)) { | |
2427 | error = PTR_ERR(dent); | |
2428 | goto error; | |
2429 | } | |
2430 | ||
c97204ba | 2431 | error = aa_mk_null_file(aa_sfs_entry.dentry); |
a71ada30 JJ |
2432 | if (error) |
2433 | goto error; | |
2434 | ||
2435 | /* TODO: add default profile to apparmorfs */ | |
63e2b423 JJ |
2436 | |
2437 | /* Report that AppArmor fs is enabled */ | |
2438 | aa_info_message("AppArmor Filesystem Enabled"); | |
2439 | return 0; | |
2440 | ||
2441 | error: | |
2442 | aa_destroy_aafs(); | |
2443 | AA_ERROR("Error creating AppArmor securityfs\n"); | |
2444 | return error; | |
2445 | } | |
2446 | ||
2447 | fs_initcall(aa_create_aafs); |