Commit | Line | Data |
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63e2b423 JJ |
1 | /* |
2 | * AppArmor security module | |
3 | * | |
4 | * This file contains AppArmor /sys/kernel/security/apparmor interface functions | |
5 | * | |
6 | * Copyright (C) 1998-2008 Novell/SUSE | |
7 | * Copyright 2009-2010 Canonical Ltd. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License as | |
11 | * published by the Free Software Foundation, version 2 of the | |
12 | * License. | |
13 | */ | |
14 | ||
0d259f04 | 15 | #include <linux/ctype.h> |
63e2b423 JJ |
16 | #include <linux/security.h> |
17 | #include <linux/vmalloc.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/seq_file.h> | |
20 | #include <linux/uaccess.h> | |
a71ada30 | 21 | #include <linux/mount.h> |
63e2b423 | 22 | #include <linux/namei.h> |
e74abcf3 | 23 | #include <linux/capability.h> |
29b3822f | 24 | #include <linux/rcupdate.h> |
a71ada30 JJ |
25 | #include <uapi/linux/major.h> |
26 | #include <linux/fs.h> | |
63e2b423 JJ |
27 | |
28 | #include "include/apparmor.h" | |
29 | #include "include/apparmorfs.h" | |
30 | #include "include/audit.h" | |
31 | #include "include/context.h" | |
f8eb8a13 | 32 | #include "include/crypto.h" |
63e2b423 | 33 | #include "include/policy.h" |
cff281f6 | 34 | #include "include/policy_ns.h" |
d384b0a1 | 35 | #include "include/resource.h" |
5ac8c355 | 36 | #include "include/policy_unpack.h" |
63e2b423 | 37 | |
0d259f04 JJ |
38 | /** |
39 | * aa_mangle_name - mangle a profile name to std profile layout form | |
40 | * @name: profile name to mangle (NOT NULL) | |
41 | * @target: buffer to store mangled name, same length as @name (MAYBE NULL) | |
42 | * | |
43 | * Returns: length of mangled name | |
44 | */ | |
bbe4a7c8 | 45 | static int mangle_name(const char *name, char *target) |
0d259f04 JJ |
46 | { |
47 | char *t = target; | |
48 | ||
49 | while (*name == '/' || *name == '.') | |
50 | name++; | |
51 | ||
52 | if (target) { | |
53 | for (; *name; name++) { | |
54 | if (*name == '/') | |
55 | *(t)++ = '.'; | |
56 | else if (isspace(*name)) | |
57 | *(t)++ = '_'; | |
58 | else if (isalnum(*name) || strchr("._-", *name)) | |
59 | *(t)++ = *name; | |
60 | } | |
61 | ||
62 | *t = 0; | |
63 | } else { | |
64 | int len = 0; | |
65 | for (; *name; name++) { | |
66 | if (isalnum(*name) || isspace(*name) || | |
67 | strchr("/._-", *name)) | |
68 | len++; | |
69 | } | |
70 | ||
71 | return len; | |
72 | } | |
73 | ||
74 | return t - target; | |
75 | } | |
76 | ||
63e2b423 JJ |
77 | /** |
78 | * aa_simple_write_to_buffer - common routine for getting policy from user | |
63e2b423 | 79 | * @userbuf: user buffer to copy data from (NOT NULL) |
3ed02ada | 80 | * @alloc_size: size of user buffer (REQUIRES: @alloc_size >= @copy_size) |
63e2b423 JJ |
81 | * @copy_size: size of data to copy from user buffer |
82 | * @pos: position write is at in the file (NOT NULL) | |
83 | * | |
84 | * Returns: kernel buffer containing copy of user buffer data or an | |
85 | * ERR_PTR on failure. | |
86 | */ | |
5ef50d01 | 87 | static struct aa_loaddata *aa_simple_write_to_buffer(const char __user *userbuf, |
5ac8c355 JJ |
88 | size_t alloc_size, |
89 | size_t copy_size, | |
90 | loff_t *pos) | |
63e2b423 | 91 | { |
5ac8c355 | 92 | struct aa_loaddata *data; |
63e2b423 | 93 | |
e6bfa25d | 94 | AA_BUG(copy_size > alloc_size); |
3ed02ada | 95 | |
63e2b423 JJ |
96 | if (*pos != 0) |
97 | /* only writes from pos 0, that is complete writes */ | |
98 | return ERR_PTR(-ESPIPE); | |
99 | ||
63e2b423 | 100 | /* freed by caller to simple_write_to_buffer */ |
5d5182ca JJ |
101 | data = aa_loaddata_alloc(alloc_size); |
102 | if (IS_ERR(data)) | |
103 | return data; | |
63e2b423 | 104 | |
5d5182ca | 105 | data->size = copy_size; |
5ac8c355 | 106 | if (copy_from_user(data->data, userbuf, copy_size)) { |
63e2b423 JJ |
107 | kvfree(data); |
108 | return ERR_PTR(-EFAULT); | |
109 | } | |
110 | ||
111 | return data; | |
112 | } | |
113 | ||
5ac8c355 | 114 | static ssize_t policy_update(int binop, const char __user *buf, size_t size, |
b7fd2c03 | 115 | loff_t *pos, struct aa_ns *ns) |
63e2b423 | 116 | { |
63e2b423 | 117 | ssize_t error; |
5ac8c355 JJ |
118 | struct aa_loaddata *data; |
119 | struct aa_profile *profile = aa_current_profile(); | |
47f6e5cc | 120 | const char *op = binop == PROF_ADD ? OP_PROF_LOAD : OP_PROF_REPL; |
5ac8c355 JJ |
121 | /* high level check about policy management - fine grained in |
122 | * below after unpack | |
123 | */ | |
b7fd2c03 | 124 | error = aa_may_manage_policy(profile, ns, op); |
5ac8c355 JJ |
125 | if (error) |
126 | return error; | |
63e2b423 | 127 | |
5ef50d01 | 128 | data = aa_simple_write_to_buffer(buf, size, size, pos); |
63e2b423 JJ |
129 | error = PTR_ERR(data); |
130 | if (!IS_ERR(data)) { | |
b7fd2c03 JJ |
131 | error = aa_replace_profiles(ns ? ns : profile->ns, profile, |
132 | binop, data); | |
5ac8c355 | 133 | aa_put_loaddata(data); |
63e2b423 JJ |
134 | } |
135 | ||
136 | return error; | |
137 | } | |
138 | ||
b7fd2c03 | 139 | /* .load file hook fn to load policy */ |
5ac8c355 JJ |
140 | static ssize_t profile_load(struct file *f, const char __user *buf, size_t size, |
141 | loff_t *pos) | |
142 | { | |
b7fd2c03 JJ |
143 | struct aa_ns *ns = aa_get_ns(f->f_inode->i_private); |
144 | int error = policy_update(PROF_ADD, buf, size, pos, ns); | |
145 | ||
146 | aa_put_ns(ns); | |
5ac8c355 JJ |
147 | |
148 | return error; | |
149 | } | |
150 | ||
63e2b423 | 151 | static const struct file_operations aa_fs_profile_load = { |
6038f373 AB |
152 | .write = profile_load, |
153 | .llseek = default_llseek, | |
63e2b423 JJ |
154 | }; |
155 | ||
156 | /* .replace file hook fn to load and/or replace policy */ | |
157 | static ssize_t profile_replace(struct file *f, const char __user *buf, | |
158 | size_t size, loff_t *pos) | |
159 | { | |
b7fd2c03 JJ |
160 | struct aa_ns *ns = aa_get_ns(f->f_inode->i_private); |
161 | int error = policy_update(PROF_REPLACE, buf, size, pos, ns); | |
162 | ||
163 | aa_put_ns(ns); | |
63e2b423 JJ |
164 | |
165 | return error; | |
166 | } | |
167 | ||
168 | static const struct file_operations aa_fs_profile_replace = { | |
6038f373 AB |
169 | .write = profile_replace, |
170 | .llseek = default_llseek, | |
63e2b423 JJ |
171 | }; |
172 | ||
b7fd2c03 | 173 | /* .remove file hook fn to remove loaded policy */ |
63e2b423 JJ |
174 | static ssize_t profile_remove(struct file *f, const char __user *buf, |
175 | size_t size, loff_t *pos) | |
176 | { | |
5ac8c355 JJ |
177 | struct aa_loaddata *data; |
178 | struct aa_profile *profile; | |
63e2b423 | 179 | ssize_t error; |
b7fd2c03 | 180 | struct aa_ns *ns = aa_get_ns(f->f_inode->i_private); |
63e2b423 | 181 | |
5ac8c355 JJ |
182 | profile = aa_current_profile(); |
183 | /* high level check about policy management - fine grained in | |
184 | * below after unpack | |
185 | */ | |
b7fd2c03 | 186 | error = aa_may_manage_policy(profile, ns, OP_PROF_RM); |
5ac8c355 JJ |
187 | if (error) |
188 | goto out; | |
189 | ||
63e2b423 JJ |
190 | /* |
191 | * aa_remove_profile needs a null terminated string so 1 extra | |
192 | * byte is allocated and the copied data is null terminated. | |
193 | */ | |
5ef50d01 | 194 | data = aa_simple_write_to_buffer(buf, size + 1, size, pos); |
63e2b423 JJ |
195 | |
196 | error = PTR_ERR(data); | |
197 | if (!IS_ERR(data)) { | |
5ac8c355 | 198 | data->data[size] = 0; |
b7fd2c03 JJ |
199 | error = aa_remove_profiles(ns ? ns : profile->ns, profile, |
200 | data->data, size); | |
5ac8c355 | 201 | aa_put_loaddata(data); |
63e2b423 | 202 | } |
5ac8c355 | 203 | out: |
b7fd2c03 | 204 | aa_put_ns(ns); |
63e2b423 JJ |
205 | return error; |
206 | } | |
207 | ||
208 | static const struct file_operations aa_fs_profile_remove = { | |
6038f373 AB |
209 | .write = profile_remove, |
210 | .llseek = default_llseek, | |
63e2b423 JJ |
211 | }; |
212 | ||
5d5182ca JJ |
213 | void __aa_bump_ns_revision(struct aa_ns *ns) |
214 | { | |
215 | ns->revision++; | |
216 | } | |
217 | ||
e025be0f WH |
218 | /** |
219 | * query_data - queries a policy and writes its data to buf | |
220 | * @buf: the resulting data is stored here (NOT NULL) | |
221 | * @buf_len: size of buf | |
222 | * @query: query string used to retrieve data | |
223 | * @query_len: size of query including second NUL byte | |
224 | * | |
225 | * The buffers pointed to by buf and query may overlap. The query buffer is | |
226 | * parsed before buf is written to. | |
227 | * | |
228 | * The query should look like "<LABEL>\0<KEY>\0", where <LABEL> is the name of | |
229 | * the security confinement context and <KEY> is the name of the data to | |
230 | * retrieve. <LABEL> and <KEY> must not be NUL-terminated. | |
231 | * | |
232 | * Don't expect the contents of buf to be preserved on failure. | |
233 | * | |
234 | * Returns: number of characters written to buf or -errno on failure | |
235 | */ | |
236 | static ssize_t query_data(char *buf, size_t buf_len, | |
237 | char *query, size_t query_len) | |
238 | { | |
239 | char *out; | |
240 | const char *key; | |
241 | struct aa_profile *profile; | |
242 | struct aa_data *data; | |
243 | u32 bytes, blocks; | |
244 | __le32 outle32; | |
245 | ||
246 | if (!query_len) | |
247 | return -EINVAL; /* need a query */ | |
248 | ||
249 | key = query + strnlen(query, query_len) + 1; | |
250 | if (key + 1 >= query + query_len) | |
251 | return -EINVAL; /* not enough space for a non-empty key */ | |
252 | if (key + strnlen(key, query + query_len - key) >= query + query_len) | |
253 | return -EINVAL; /* must end with NUL */ | |
254 | ||
255 | if (buf_len < sizeof(bytes) + sizeof(blocks)) | |
256 | return -EINVAL; /* not enough space */ | |
257 | ||
258 | profile = aa_current_profile(); | |
259 | ||
260 | /* We are going to leave space for two numbers. The first is the total | |
261 | * number of bytes we are writing after the first number. This is so | |
262 | * users can read the full output without reallocation. | |
263 | * | |
264 | * The second number is the number of data blocks we're writing. An | |
265 | * application might be confined by multiple policies having data in | |
266 | * the same key. | |
267 | */ | |
268 | memset(buf, 0, sizeof(bytes) + sizeof(blocks)); | |
269 | out = buf + sizeof(bytes) + sizeof(blocks); | |
270 | ||
271 | blocks = 0; | |
272 | if (profile->data) { | |
273 | data = rhashtable_lookup_fast(profile->data, &key, | |
274 | profile->data->p); | |
275 | ||
276 | if (data) { | |
277 | if (out + sizeof(outle32) + data->size > buf + buf_len) | |
278 | return -EINVAL; /* not enough space */ | |
279 | outle32 = __cpu_to_le32(data->size); | |
280 | memcpy(out, &outle32, sizeof(outle32)); | |
281 | out += sizeof(outle32); | |
282 | memcpy(out, data->data, data->size); | |
283 | out += data->size; | |
284 | blocks++; | |
285 | } | |
286 | } | |
287 | ||
288 | outle32 = __cpu_to_le32(out - buf - sizeof(bytes)); | |
289 | memcpy(buf, &outle32, sizeof(outle32)); | |
290 | outle32 = __cpu_to_le32(blocks); | |
291 | memcpy(buf + sizeof(bytes), &outle32, sizeof(outle32)); | |
292 | ||
293 | return out - buf; | |
294 | } | |
295 | ||
296 | #define QUERY_CMD_DATA "data\0" | |
297 | #define QUERY_CMD_DATA_LEN 5 | |
298 | ||
299 | /** | |
300 | * aa_write_access - generic permissions and data query | |
301 | * @file: pointer to open apparmorfs/access file | |
302 | * @ubuf: user buffer containing the complete query string (NOT NULL) | |
303 | * @count: size of ubuf | |
304 | * @ppos: position in the file (MUST BE ZERO) | |
305 | * | |
306 | * Allows for one permissions or data query per open(), write(), and read() | |
307 | * sequence. The only queries currently supported are label-based queries for | |
308 | * permissions or data. | |
309 | * | |
310 | * For permissions queries, ubuf must begin with "label\0", followed by the | |
311 | * profile query specific format described in the query_label() function | |
312 | * documentation. | |
313 | * | |
314 | * For data queries, ubuf must have the form "data\0<LABEL>\0<KEY>\0", where | |
315 | * <LABEL> is the name of the security confinement context and <KEY> is the | |
316 | * name of the data to retrieve. | |
317 | * | |
318 | * Returns: number of bytes written or -errno on failure | |
319 | */ | |
320 | static ssize_t aa_write_access(struct file *file, const char __user *ubuf, | |
321 | size_t count, loff_t *ppos) | |
322 | { | |
323 | char *buf; | |
324 | ssize_t len; | |
325 | ||
326 | if (*ppos) | |
327 | return -ESPIPE; | |
328 | ||
329 | buf = simple_transaction_get(file, ubuf, count); | |
330 | if (IS_ERR(buf)) | |
331 | return PTR_ERR(buf); | |
332 | ||
333 | if (count > QUERY_CMD_DATA_LEN && | |
334 | !memcmp(buf, QUERY_CMD_DATA, QUERY_CMD_DATA_LEN)) { | |
335 | len = query_data(buf, SIMPLE_TRANSACTION_LIMIT, | |
336 | buf + QUERY_CMD_DATA_LEN, | |
337 | count - QUERY_CMD_DATA_LEN); | |
338 | } else | |
339 | len = -EINVAL; | |
340 | ||
341 | if (len < 0) | |
342 | return len; | |
343 | ||
344 | simple_transaction_set(file, len); | |
345 | ||
346 | return count; | |
347 | } | |
348 | ||
349 | static const struct file_operations aa_fs_access = { | |
350 | .write = aa_write_access, | |
351 | .read = simple_transaction_read, | |
352 | .release = simple_transaction_release, | |
353 | .llseek = generic_file_llseek, | |
354 | }; | |
355 | ||
e74abcf3 KC |
356 | static int aa_fs_seq_show(struct seq_file *seq, void *v) |
357 | { | |
358 | struct aa_fs_entry *fs_file = seq->private; | |
359 | ||
360 | if (!fs_file) | |
361 | return 0; | |
362 | ||
363 | switch (fs_file->v_type) { | |
364 | case AA_FS_TYPE_BOOLEAN: | |
365 | seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no"); | |
366 | break; | |
a9bf8e9f KC |
367 | case AA_FS_TYPE_STRING: |
368 | seq_printf(seq, "%s\n", fs_file->v.string); | |
369 | break; | |
e74abcf3 KC |
370 | case AA_FS_TYPE_U64: |
371 | seq_printf(seq, "%#08lx\n", fs_file->v.u64); | |
372 | break; | |
373 | default: | |
374 | /* Ignore unpritable entry types. */ | |
375 | break; | |
376 | } | |
377 | ||
378 | return 0; | |
379 | } | |
380 | ||
381 | static int aa_fs_seq_open(struct inode *inode, struct file *file) | |
382 | { | |
383 | return single_open(file, aa_fs_seq_show, inode->i_private); | |
384 | } | |
385 | ||
386 | const struct file_operations aa_fs_seq_file_ops = { | |
387 | .owner = THIS_MODULE, | |
388 | .open = aa_fs_seq_open, | |
389 | .read = seq_read, | |
390 | .llseek = seq_lseek, | |
391 | .release = single_release, | |
392 | }; | |
393 | ||
52b97de3 JJ |
394 | /* |
395 | * profile based file operations | |
396 | * policy/profiles/XXXX/profiles/ * | |
397 | */ | |
398 | ||
399 | #define SEQ_PROFILE_FOPS(NAME) \ | |
400 | static int seq_profile_ ##NAME ##_open(struct inode *inode, struct file *file)\ | |
401 | { \ | |
402 | return seq_profile_open(inode, file, seq_profile_ ##NAME ##_show); \ | |
403 | } \ | |
404 | \ | |
405 | static const struct file_operations seq_profile_ ##NAME ##_fops = { \ | |
406 | .owner = THIS_MODULE, \ | |
407 | .open = seq_profile_ ##NAME ##_open, \ | |
408 | .read = seq_read, \ | |
409 | .llseek = seq_lseek, \ | |
410 | .release = seq_profile_release, \ | |
411 | } \ | |
412 | ||
413 | static int seq_profile_open(struct inode *inode, struct file *file, | |
414 | int (*show)(struct seq_file *, void *)) | |
0d259f04 | 415 | { |
8399588a JJ |
416 | struct aa_proxy *proxy = aa_get_proxy(inode->i_private); |
417 | int error = single_open(file, show, proxy); | |
0d259f04 JJ |
418 | |
419 | if (error) { | |
420 | file->private_data = NULL; | |
8399588a | 421 | aa_put_proxy(proxy); |
0d259f04 JJ |
422 | } |
423 | ||
424 | return error; | |
425 | } | |
426 | ||
52b97de3 | 427 | static int seq_profile_release(struct inode *inode, struct file *file) |
0d259f04 JJ |
428 | { |
429 | struct seq_file *seq = (struct seq_file *) file->private_data; | |
430 | if (seq) | |
8399588a | 431 | aa_put_proxy(seq->private); |
0d259f04 JJ |
432 | return single_release(inode, file); |
433 | } | |
434 | ||
52b97de3 | 435 | static int seq_profile_name_show(struct seq_file *seq, void *v) |
0d259f04 | 436 | { |
8399588a JJ |
437 | struct aa_proxy *proxy = seq->private; |
438 | struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile); | |
0d259f04 JJ |
439 | seq_printf(seq, "%s\n", profile->base.name); |
440 | aa_put_profile(profile); | |
441 | ||
442 | return 0; | |
443 | } | |
444 | ||
52b97de3 | 445 | static int seq_profile_mode_show(struct seq_file *seq, void *v) |
0d259f04 | 446 | { |
8399588a JJ |
447 | struct aa_proxy *proxy = seq->private; |
448 | struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile); | |
0d259f04 JJ |
449 | seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]); |
450 | aa_put_profile(profile); | |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
52b97de3 | 455 | static int seq_profile_attach_show(struct seq_file *seq, void *v) |
556d0be7 | 456 | { |
8399588a JJ |
457 | struct aa_proxy *proxy = seq->private; |
458 | struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile); | |
556d0be7 JJ |
459 | if (profile->attach) |
460 | seq_printf(seq, "%s\n", profile->attach); | |
461 | else if (profile->xmatch) | |
462 | seq_puts(seq, "<unknown>\n"); | |
463 | else | |
464 | seq_printf(seq, "%s\n", profile->base.name); | |
465 | aa_put_profile(profile); | |
466 | ||
467 | return 0; | |
468 | } | |
469 | ||
52b97de3 | 470 | static int seq_profile_hash_show(struct seq_file *seq, void *v) |
f8eb8a13 | 471 | { |
8399588a JJ |
472 | struct aa_proxy *proxy = seq->private; |
473 | struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile); | |
f8eb8a13 JJ |
474 | unsigned int i, size = aa_hash_size(); |
475 | ||
476 | if (profile->hash) { | |
477 | for (i = 0; i < size; i++) | |
478 | seq_printf(seq, "%.2x", profile->hash[i]); | |
47dbd1cd | 479 | seq_putc(seq, '\n'); |
f8eb8a13 | 480 | } |
0b938a2e | 481 | aa_put_profile(profile); |
f8eb8a13 JJ |
482 | |
483 | return 0; | |
484 | } | |
485 | ||
52b97de3 JJ |
486 | SEQ_PROFILE_FOPS(name); |
487 | SEQ_PROFILE_FOPS(mode); | |
488 | SEQ_PROFILE_FOPS(attach); | |
489 | SEQ_PROFILE_FOPS(hash); | |
f8eb8a13 | 490 | |
64c86970 JJ |
491 | /* |
492 | * namespace based files | |
493 | * several root files and | |
494 | * policy/ * | |
495 | */ | |
f8eb8a13 | 496 | |
64c86970 JJ |
497 | #define SEQ_NS_FOPS(NAME) \ |
498 | static int seq_ns_ ##NAME ##_open(struct inode *inode, struct file *file) \ | |
499 | { \ | |
500 | return single_open(file, seq_ns_ ##NAME ##_show, inode->i_private); \ | |
501 | } \ | |
502 | \ | |
503 | static const struct file_operations seq_ns_ ##NAME ##_fops = { \ | |
504 | .owner = THIS_MODULE, \ | |
505 | .open = seq_ns_ ##NAME ##_open, \ | |
506 | .read = seq_read, \ | |
507 | .llseek = seq_lseek, \ | |
508 | .release = single_release, \ | |
509 | } \ | |
3e3e5695 | 510 | |
64c86970 | 511 | static int seq_ns_level_show(struct seq_file *seq, void *v) |
a71ada30 JJ |
512 | { |
513 | struct aa_ns *ns = aa_current_profile()->ns; | |
514 | ||
515 | seq_printf(seq, "%d\n", ns->level); | |
516 | ||
517 | return 0; | |
518 | } | |
519 | ||
64c86970 | 520 | static int seq_ns_name_show(struct seq_file *seq, void *v) |
3e3e5695 JJ |
521 | { |
522 | struct aa_ns *ns = aa_current_profile()->ns; | |
523 | ||
524 | seq_printf(seq, "%s\n", ns->base.name); | |
525 | ||
526 | return 0; | |
527 | } | |
528 | ||
64c86970 JJ |
529 | SEQ_NS_FOPS(level); |
530 | SEQ_NS_FOPS(name); | |
3e3e5695 | 531 | |
5d5182ca JJ |
532 | |
533 | /* policy/raw_data/ * file ops */ | |
534 | ||
535 | #define SEQ_RAWDATA_FOPS(NAME) \ | |
536 | static int seq_rawdata_ ##NAME ##_open(struct inode *inode, struct file *file)\ | |
537 | { \ | |
538 | return seq_rawdata_open(inode, file, seq_rawdata_ ##NAME ##_show); \ | |
539 | } \ | |
540 | \ | |
541 | static const struct file_operations seq_rawdata_ ##NAME ##_fops = { \ | |
542 | .owner = THIS_MODULE, \ | |
543 | .open = seq_rawdata_ ##NAME ##_open, \ | |
544 | .read = seq_read, \ | |
545 | .llseek = seq_lseek, \ | |
546 | .release = seq_rawdata_release, \ | |
547 | } \ | |
548 | ||
549 | static int seq_rawdata_open(struct inode *inode, struct file *file, | |
550 | int (*show)(struct seq_file *, void *)) | |
5ac8c355 | 551 | { |
5d5182ca JJ |
552 | struct aa_loaddata *data = __aa_get_loaddata(inode->i_private); |
553 | int error; | |
5ac8c355 | 554 | |
5d5182ca JJ |
555 | if (!data) |
556 | /* lost race this ent is being reaped */ | |
557 | return -ENOENT; | |
558 | ||
559 | error = single_open(file, show, data); | |
560 | if (error) { | |
561 | AA_BUG(file->private_data && | |
562 | ((struct seq_file *)file->private_data)->private); | |
563 | aa_put_loaddata(data); | |
564 | } | |
565 | ||
566 | return error; | |
5ac8c355 JJ |
567 | } |
568 | ||
5d5182ca | 569 | static int seq_rawdata_release(struct inode *inode, struct file *file) |
5ac8c355 | 570 | { |
5d5182ca | 571 | struct seq_file *seq = (struct seq_file *) file->private_data; |
5ac8c355 | 572 | |
5d5182ca JJ |
573 | if (seq) |
574 | aa_put_loaddata(seq->private); | |
0ff3d97f | 575 | |
5d5182ca JJ |
576 | return single_release(inode, file); |
577 | } | |
578 | ||
579 | static int seq_rawdata_abi_show(struct seq_file *seq, void *v) | |
580 | { | |
581 | struct aa_loaddata *data = seq->private; | |
582 | ||
583 | seq_printf(seq, "v%d\n", data->abi); | |
5ac8c355 JJ |
584 | |
585 | return 0; | |
586 | } | |
587 | ||
5d5182ca | 588 | static int seq_rawdata_revision_show(struct seq_file *seq, void *v) |
5ac8c355 | 589 | { |
5d5182ca | 590 | struct aa_loaddata *data = seq->private; |
5ac8c355 | 591 | |
5d5182ca JJ |
592 | seq_printf(seq, "%ld\n", data->revision); |
593 | ||
594 | return 0; | |
595 | } | |
5ac8c355 | 596 | |
5d5182ca | 597 | static int seq_rawdata_hash_show(struct seq_file *seq, void *v) |
5ac8c355 | 598 | { |
5d5182ca | 599 | struct aa_loaddata *data = seq->private; |
5ac8c355 JJ |
600 | unsigned int i, size = aa_hash_size(); |
601 | ||
5d5182ca | 602 | if (data->hash) { |
5ac8c355 | 603 | for (i = 0; i < size; i++) |
5d5182ca | 604 | seq_printf(seq, "%.2x", data->hash[i]); |
47dbd1cd | 605 | seq_putc(seq, '\n'); |
5ac8c355 | 606 | } |
5ac8c355 JJ |
607 | |
608 | return 0; | |
609 | } | |
610 | ||
5d5182ca JJ |
611 | SEQ_RAWDATA_FOPS(abi); |
612 | SEQ_RAWDATA_FOPS(revision); | |
613 | SEQ_RAWDATA_FOPS(hash); | |
5ac8c355 JJ |
614 | |
615 | static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size, | |
616 | loff_t *ppos) | |
617 | { | |
618 | struct aa_loaddata *rawdata = file->private_data; | |
619 | ||
620 | return simple_read_from_buffer(buf, size, ppos, rawdata->data, | |
621 | rawdata->size); | |
622 | } | |
623 | ||
5d5182ca | 624 | static int rawdata_release(struct inode *inode, struct file *file) |
5ac8c355 | 625 | { |
5d5182ca JJ |
626 | aa_put_loaddata(file->private_data); |
627 | ||
628 | return 0; | |
629 | } | |
5ac8c355 | 630 | |
5d5182ca JJ |
631 | static int rawdata_open(struct inode *inode, struct file *file) |
632 | { | |
5ac8c355 JJ |
633 | if (!policy_view_capable(NULL)) |
634 | return -EACCES; | |
5d5182ca JJ |
635 | file->private_data = __aa_get_loaddata(inode->i_private); |
636 | if (!file->private_data) | |
637 | /* lost race: this entry is being reaped */ | |
638 | return -ENOENT; | |
5ac8c355 JJ |
639 | |
640 | return 0; | |
641 | } | |
642 | ||
5d5182ca | 643 | static const struct file_operations rawdata_fops = { |
5ac8c355 JJ |
644 | .open = rawdata_open, |
645 | .read = rawdata_read, | |
646 | .llseek = generic_file_llseek, | |
647 | .release = rawdata_release, | |
648 | }; | |
649 | ||
5d5182ca JJ |
650 | static void remove_rawdata_dents(struct aa_loaddata *rawdata) |
651 | { | |
652 | int i; | |
653 | ||
654 | for (i = 0; i < AAFS_LOADDATA_NDENTS; i++) { | |
655 | if (!IS_ERR_OR_NULL(rawdata->dents[i])) { | |
656 | /* no refcounts on i_private */ | |
657 | securityfs_remove(rawdata->dents[i]); | |
658 | rawdata->dents[i] = NULL; | |
659 | } | |
660 | } | |
661 | } | |
662 | ||
663 | void __aa_fs_remove_rawdata(struct aa_loaddata *rawdata) | |
664 | { | |
665 | AA_BUG(rawdata->ns && !mutex_is_locked(&rawdata->ns->lock)); | |
666 | ||
667 | if (rawdata->ns) { | |
668 | remove_rawdata_dents(rawdata); | |
669 | list_del_init(&rawdata->list); | |
670 | aa_put_ns(rawdata->ns); | |
671 | rawdata->ns = NULL; | |
672 | } | |
673 | } | |
674 | ||
675 | int __aa_fs_create_rawdata(struct aa_ns *ns, struct aa_loaddata *rawdata) | |
676 | { | |
677 | struct dentry *dent, *dir; | |
678 | ||
679 | AA_BUG(!ns); | |
680 | AA_BUG(!rawdata); | |
681 | AA_BUG(!mutex_is_locked(&ns->lock)); | |
682 | AA_BUG(!ns_subdata_dir(ns)); | |
683 | ||
684 | /* | |
685 | * just use ns revision dir was originally created at. This is | |
686 | * under ns->lock and if load is successful revision will be | |
687 | * bumped and is guaranteed to be unique | |
688 | */ | |
689 | rawdata->name = kasprintf(GFP_KERNEL, "%ld", ns->revision); | |
690 | if (!rawdata->name) | |
691 | return -ENOMEM; | |
692 | ||
693 | dir = securityfs_create_dir(rawdata->name, ns_subdata_dir(ns)); | |
694 | if (IS_ERR(dir)) | |
695 | /* ->name freed when rawdata freed */ | |
696 | return PTR_ERR(dir); | |
697 | rawdata->dents[AAFS_LOADDATA_DIR] = dir; | |
698 | ||
699 | dent = securityfs_create_file("abi", S_IFREG | 0444, dir, rawdata, | |
700 | &seq_rawdata_abi_fops); | |
701 | if (IS_ERR(dent)) | |
702 | goto fail; | |
703 | rawdata->dents[AAFS_LOADDATA_ABI] = dent; | |
704 | ||
705 | dent = securityfs_create_file("revision", S_IFREG | 0444, dir, rawdata, | |
706 | &seq_rawdata_revision_fops); | |
707 | if (IS_ERR(dent)) | |
708 | goto fail; | |
709 | rawdata->dents[AAFS_LOADDATA_REVISION] = dent; | |
710 | ||
711 | if (aa_g_hash_policy) { | |
712 | dent = securityfs_create_file("sha1", S_IFREG | 0444, dir, | |
713 | rawdata, &seq_rawdata_hash_fops); | |
714 | if (IS_ERR(dent)) | |
715 | goto fail; | |
716 | rawdata->dents[AAFS_LOADDATA_HASH] = dent; | |
717 | } | |
718 | ||
719 | dent = securityfs_create_file("raw_data", S_IFREG | 0444, | |
720 | dir, rawdata, &rawdata_fops); | |
721 | if (IS_ERR(dent)) | |
722 | goto fail; | |
723 | rawdata->dents[AAFS_LOADDATA_DATA] = dent; | |
724 | d_inode(dent)->i_size = rawdata->size; | |
725 | ||
726 | rawdata->ns = aa_get_ns(ns); | |
727 | list_add(&rawdata->list, &ns->rawdata_list); | |
728 | /* no refcount on inode rawdata */ | |
729 | ||
730 | return 0; | |
731 | ||
732 | fail: | |
733 | remove_rawdata_dents(rawdata); | |
734 | ||
735 | return PTR_ERR(dent); | |
736 | } | |
737 | ||
0d259f04 JJ |
738 | /** fns to setup dynamic per profile/namespace files **/ |
739 | void __aa_fs_profile_rmdir(struct aa_profile *profile) | |
740 | { | |
741 | struct aa_profile *child; | |
742 | int i; | |
743 | ||
744 | if (!profile) | |
745 | return; | |
746 | ||
747 | list_for_each_entry(child, &profile->base.profiles, base.list) | |
748 | __aa_fs_profile_rmdir(child); | |
749 | ||
750 | for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) { | |
8399588a | 751 | struct aa_proxy *proxy; |
0d259f04 JJ |
752 | if (!profile->dents[i]) |
753 | continue; | |
754 | ||
8399588a | 755 | proxy = d_inode(profile->dents[i])->i_private; |
0d259f04 | 756 | securityfs_remove(profile->dents[i]); |
8399588a | 757 | aa_put_proxy(proxy); |
0d259f04 JJ |
758 | profile->dents[i] = NULL; |
759 | } | |
760 | } | |
761 | ||
762 | void __aa_fs_profile_migrate_dents(struct aa_profile *old, | |
763 | struct aa_profile *new) | |
764 | { | |
765 | int i; | |
766 | ||
767 | for (i = 0; i < AAFS_PROF_SIZEOF; i++) { | |
768 | new->dents[i] = old->dents[i]; | |
d671e890 | 769 | if (new->dents[i]) |
078cd827 | 770 | new->dents[i]->d_inode->i_mtime = current_time(new->dents[i]->d_inode); |
0d259f04 JJ |
771 | old->dents[i] = NULL; |
772 | } | |
773 | } | |
774 | ||
775 | static struct dentry *create_profile_file(struct dentry *dir, const char *name, | |
776 | struct aa_profile *profile, | |
777 | const struct file_operations *fops) | |
778 | { | |
8399588a | 779 | struct aa_proxy *proxy = aa_get_proxy(profile->proxy); |
0d259f04 JJ |
780 | struct dentry *dent; |
781 | ||
8399588a | 782 | dent = securityfs_create_file(name, S_IFREG | 0444, dir, proxy, fops); |
0d259f04 | 783 | if (IS_ERR(dent)) |
8399588a | 784 | aa_put_proxy(proxy); |
0d259f04 JJ |
785 | |
786 | return dent; | |
787 | } | |
788 | ||
5d5182ca JJ |
789 | static int profile_depth(struct aa_profile *profile) |
790 | { | |
791 | int depth = 0; | |
792 | ||
793 | rcu_read_lock(); | |
794 | for (depth = 0; profile; profile = rcu_access_pointer(profile->parent)) | |
795 | depth++; | |
796 | rcu_read_unlock(); | |
797 | ||
798 | return depth; | |
799 | } | |
800 | ||
801 | static int gen_symlink_name(char *buffer, size_t bsize, int depth, | |
802 | const char *dirname, const char *fname) | |
803 | { | |
804 | int error; | |
805 | ||
806 | for (; depth > 0; depth--) { | |
807 | if (bsize < 7) | |
808 | return -ENAMETOOLONG; | |
809 | strcpy(buffer, "../../"); | |
810 | buffer += 6; | |
811 | bsize -= 6; | |
812 | } | |
813 | ||
814 | error = snprintf(buffer, bsize, "raw_data/%s/%s", dirname, fname); | |
815 | if (error >= bsize || error < 0) | |
816 | return -ENAMETOOLONG; | |
817 | ||
818 | return 0; | |
819 | } | |
820 | ||
821 | /* | |
822 | * Requires: @profile->ns->lock held | |
823 | */ | |
0d259f04 JJ |
824 | int __aa_fs_profile_mkdir(struct aa_profile *profile, struct dentry *parent) |
825 | { | |
826 | struct aa_profile *child; | |
827 | struct dentry *dent = NULL, *dir; | |
828 | int error; | |
829 | ||
830 | if (!parent) { | |
831 | struct aa_profile *p; | |
832 | p = aa_deref_parent(profile); | |
833 | dent = prof_dir(p); | |
834 | /* adding to parent that previously didn't have children */ | |
835 | dent = securityfs_create_dir("profiles", dent); | |
836 | if (IS_ERR(dent)) | |
837 | goto fail; | |
838 | prof_child_dir(p) = parent = dent; | |
839 | } | |
840 | ||
841 | if (!profile->dirname) { | |
842 | int len, id_len; | |
843 | len = mangle_name(profile->base.name, NULL); | |
844 | id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id); | |
845 | ||
846 | profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL); | |
ffac1de6 DC |
847 | if (!profile->dirname) { |
848 | error = -ENOMEM; | |
849 | goto fail2; | |
850 | } | |
0d259f04 JJ |
851 | |
852 | mangle_name(profile->base.name, profile->dirname); | |
853 | sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++); | |
854 | } | |
855 | ||
856 | dent = securityfs_create_dir(profile->dirname, parent); | |
857 | if (IS_ERR(dent)) | |
858 | goto fail; | |
859 | prof_dir(profile) = dir = dent; | |
860 | ||
52b97de3 JJ |
861 | dent = create_profile_file(dir, "name", profile, |
862 | &seq_profile_name_fops); | |
0d259f04 JJ |
863 | if (IS_ERR(dent)) |
864 | goto fail; | |
865 | profile->dents[AAFS_PROF_NAME] = dent; | |
866 | ||
52b97de3 JJ |
867 | dent = create_profile_file(dir, "mode", profile, |
868 | &seq_profile_mode_fops); | |
0d259f04 JJ |
869 | if (IS_ERR(dent)) |
870 | goto fail; | |
871 | profile->dents[AAFS_PROF_MODE] = dent; | |
872 | ||
556d0be7 | 873 | dent = create_profile_file(dir, "attach", profile, |
52b97de3 | 874 | &seq_profile_attach_fops); |
556d0be7 JJ |
875 | if (IS_ERR(dent)) |
876 | goto fail; | |
877 | profile->dents[AAFS_PROF_ATTACH] = dent; | |
878 | ||
f8eb8a13 JJ |
879 | if (profile->hash) { |
880 | dent = create_profile_file(dir, "sha1", profile, | |
52b97de3 | 881 | &seq_profile_hash_fops); |
f8eb8a13 JJ |
882 | if (IS_ERR(dent)) |
883 | goto fail; | |
884 | profile->dents[AAFS_PROF_HASH] = dent; | |
885 | } | |
886 | ||
5ac8c355 | 887 | if (profile->rawdata) { |
5d5182ca JJ |
888 | char target[64]; |
889 | int depth = profile_depth(profile); | |
890 | ||
891 | error = gen_symlink_name(target, sizeof(target), depth, | |
892 | profile->rawdata->name, "sha1"); | |
893 | if (error < 0) | |
894 | goto fail2; | |
895 | dent = securityfs_create_symlink("raw_sha1", dir, target, NULL); | |
5ac8c355 JJ |
896 | if (IS_ERR(dent)) |
897 | goto fail; | |
898 | profile->dents[AAFS_PROF_RAW_HASH] = dent; | |
899 | ||
5d5182ca JJ |
900 | error = gen_symlink_name(target, sizeof(target), depth, |
901 | profile->rawdata->name, "abi"); | |
902 | if (error < 0) | |
903 | goto fail2; | |
904 | dent = securityfs_create_symlink("raw_abi", dir, target, NULL); | |
5ac8c355 JJ |
905 | if (IS_ERR(dent)) |
906 | goto fail; | |
907 | profile->dents[AAFS_PROF_RAW_ABI] = dent; | |
908 | ||
5d5182ca JJ |
909 | error = gen_symlink_name(target, sizeof(target), depth, |
910 | profile->rawdata->name, "raw_data"); | |
911 | if (error < 0) | |
912 | goto fail2; | |
913 | dent = securityfs_create_symlink("raw_data", dir, target, NULL); | |
5ac8c355 JJ |
914 | if (IS_ERR(dent)) |
915 | goto fail; | |
916 | profile->dents[AAFS_PROF_RAW_DATA] = dent; | |
5ac8c355 JJ |
917 | } |
918 | ||
0d259f04 JJ |
919 | list_for_each_entry(child, &profile->base.profiles, base.list) { |
920 | error = __aa_fs_profile_mkdir(child, prof_child_dir(profile)); | |
921 | if (error) | |
922 | goto fail2; | |
923 | } | |
924 | ||
925 | return 0; | |
926 | ||
927 | fail: | |
928 | error = PTR_ERR(dent); | |
929 | ||
930 | fail2: | |
931 | __aa_fs_profile_rmdir(profile); | |
932 | ||
933 | return error; | |
934 | } | |
935 | ||
5d5182ca JJ |
936 | static void __aa_fs_list_remove_rawdata(struct aa_ns *ns) |
937 | { | |
938 | struct aa_loaddata *ent, *tmp; | |
939 | ||
940 | AA_BUG(!mutex_is_locked(&ns->lock)); | |
941 | ||
942 | list_for_each_entry_safe(ent, tmp, &ns->rawdata_list, list) | |
943 | __aa_fs_remove_rawdata(ent); | |
944 | } | |
945 | ||
98849dff | 946 | void __aa_fs_ns_rmdir(struct aa_ns *ns) |
0d259f04 | 947 | { |
98849dff | 948 | struct aa_ns *sub; |
0d259f04 JJ |
949 | struct aa_profile *child; |
950 | int i; | |
951 | ||
952 | if (!ns) | |
953 | return; | |
954 | ||
955 | list_for_each_entry(child, &ns->base.profiles, base.list) | |
956 | __aa_fs_profile_rmdir(child); | |
957 | ||
958 | list_for_each_entry(sub, &ns->sub_ns, base.list) { | |
959 | mutex_lock(&sub->lock); | |
98849dff | 960 | __aa_fs_ns_rmdir(sub); |
0d259f04 JJ |
961 | mutex_unlock(&sub->lock); |
962 | } | |
963 | ||
5d5182ca JJ |
964 | __aa_fs_list_remove_rawdata(ns); |
965 | ||
b7fd2c03 JJ |
966 | if (ns_subns_dir(ns)) { |
967 | sub = d_inode(ns_subns_dir(ns))->i_private; | |
968 | aa_put_ns(sub); | |
969 | } | |
970 | if (ns_subload(ns)) { | |
971 | sub = d_inode(ns_subload(ns))->i_private; | |
972 | aa_put_ns(sub); | |
973 | } | |
974 | if (ns_subreplace(ns)) { | |
975 | sub = d_inode(ns_subreplace(ns))->i_private; | |
976 | aa_put_ns(sub); | |
977 | } | |
978 | if (ns_subremove(ns)) { | |
979 | sub = d_inode(ns_subremove(ns))->i_private; | |
980 | aa_put_ns(sub); | |
981 | } | |
982 | ||
0d259f04 JJ |
983 | for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) { |
984 | securityfs_remove(ns->dents[i]); | |
985 | ns->dents[i] = NULL; | |
986 | } | |
987 | } | |
988 | ||
b7fd2c03 JJ |
989 | /* assumes cleanup in caller */ |
990 | static int __aa_fs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir) | |
991 | { | |
992 | struct dentry *dent; | |
993 | ||
994 | AA_BUG(!ns); | |
995 | AA_BUG(!dir); | |
996 | ||
997 | dent = securityfs_create_dir("profiles", dir); | |
998 | if (IS_ERR(dent)) | |
999 | return PTR_ERR(dent); | |
1000 | ns_subprofs_dir(ns) = dent; | |
1001 | ||
1002 | dent = securityfs_create_dir("raw_data", dir); | |
1003 | if (IS_ERR(dent)) | |
1004 | return PTR_ERR(dent); | |
1005 | ns_subdata_dir(ns) = dent; | |
1006 | ||
1007 | dent = securityfs_create_file(".load", 0640, dir, ns, | |
1008 | &aa_fs_profile_load); | |
1009 | if (IS_ERR(dent)) | |
1010 | return PTR_ERR(dent); | |
1011 | aa_get_ns(ns); | |
1012 | ns_subload(ns) = dent; | |
1013 | ||
1014 | dent = securityfs_create_file(".replace", 0640, dir, ns, | |
1015 | &aa_fs_profile_replace); | |
1016 | if (IS_ERR(dent)) | |
1017 | return PTR_ERR(dent); | |
1018 | aa_get_ns(ns); | |
1019 | ns_subreplace(ns) = dent; | |
1020 | ||
1021 | dent = securityfs_create_file(".remove", 0640, dir, ns, | |
1022 | &aa_fs_profile_remove); | |
1023 | if (IS_ERR(dent)) | |
1024 | return PTR_ERR(dent); | |
1025 | aa_get_ns(ns); | |
1026 | ns_subremove(ns) = dent; | |
1027 | ||
1028 | dent = securityfs_create_dir("namespaces", dir); | |
1029 | if (IS_ERR(dent)) | |
1030 | return PTR_ERR(dent); | |
1031 | aa_get_ns(ns); | |
1032 | ns_subns_dir(ns) = dent; | |
1033 | ||
1034 | return 0; | |
1035 | } | |
1036 | ||
98849dff | 1037 | int __aa_fs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name) |
0d259f04 | 1038 | { |
98849dff | 1039 | struct aa_ns *sub; |
0d259f04 JJ |
1040 | struct aa_profile *child; |
1041 | struct dentry *dent, *dir; | |
1042 | int error; | |
1043 | ||
b7fd2c03 JJ |
1044 | AA_BUG(!ns); |
1045 | AA_BUG(!parent); | |
1046 | AA_BUG(!mutex_is_locked(&ns->lock)); | |
1047 | ||
0d259f04 JJ |
1048 | if (!name) |
1049 | name = ns->base.name; | |
1050 | ||
b7fd2c03 | 1051 | /* create ns dir if it doesn't already exist */ |
0d259f04 JJ |
1052 | dent = securityfs_create_dir(name, parent); |
1053 | if (IS_ERR(dent)) | |
1054 | goto fail; | |
63e2b423 | 1055 | |
b7fd2c03 JJ |
1056 | ns_dir(ns) = dir = dent; |
1057 | error = __aa_fs_ns_mkdir_entries(ns, dir); | |
1058 | if (error) | |
1059 | goto fail2; | |
0d259f04 | 1060 | |
b7fd2c03 | 1061 | /* profiles */ |
0d259f04 JJ |
1062 | list_for_each_entry(child, &ns->base.profiles, base.list) { |
1063 | error = __aa_fs_profile_mkdir(child, ns_subprofs_dir(ns)); | |
1064 | if (error) | |
1065 | goto fail2; | |
1066 | } | |
1067 | ||
b7fd2c03 | 1068 | /* subnamespaces */ |
0d259f04 JJ |
1069 | list_for_each_entry(sub, &ns->sub_ns, base.list) { |
1070 | mutex_lock(&sub->lock); | |
98849dff | 1071 | error = __aa_fs_ns_mkdir(sub, ns_subns_dir(ns), NULL); |
0d259f04 JJ |
1072 | mutex_unlock(&sub->lock); |
1073 | if (error) | |
1074 | goto fail2; | |
1075 | } | |
1076 | ||
1077 | return 0; | |
1078 | ||
1079 | fail: | |
1080 | error = PTR_ERR(dent); | |
1081 | ||
1082 | fail2: | |
98849dff | 1083 | __aa_fs_ns_rmdir(ns); |
0d259f04 JJ |
1084 | |
1085 | return error; | |
1086 | } | |
1087 | ||
1088 | ||
29b3822f JJ |
1089 | #define list_entry_is_head(pos, head, member) (&pos->member == (head)) |
1090 | ||
1091 | /** | |
98849dff | 1092 | * __next_ns - find the next namespace to list |
29b3822f JJ |
1093 | * @root: root namespace to stop search at (NOT NULL) |
1094 | * @ns: current ns position (NOT NULL) | |
1095 | * | |
1096 | * Find the next namespace from @ns under @root and handle all locking needed | |
1097 | * while switching current namespace. | |
1098 | * | |
1099 | * Returns: next namespace or NULL if at last namespace under @root | |
1100 | * Requires: ns->parent->lock to be held | |
1101 | * NOTE: will not unlock root->lock | |
1102 | */ | |
98849dff | 1103 | static struct aa_ns *__next_ns(struct aa_ns *root, struct aa_ns *ns) |
29b3822f | 1104 | { |
98849dff | 1105 | struct aa_ns *parent, *next; |
29b3822f JJ |
1106 | |
1107 | /* is next namespace a child */ | |
1108 | if (!list_empty(&ns->sub_ns)) { | |
1109 | next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list); | |
1110 | mutex_lock(&next->lock); | |
1111 | return next; | |
1112 | } | |
1113 | ||
1114 | /* check if the next ns is a sibling, parent, gp, .. */ | |
1115 | parent = ns->parent; | |
ed2c7da3 | 1116 | while (ns != root) { |
29b3822f | 1117 | mutex_unlock(&ns->lock); |
38dbd7d8 | 1118 | next = list_next_entry(ns, base.list); |
29b3822f JJ |
1119 | if (!list_entry_is_head(next, &parent->sub_ns, base.list)) { |
1120 | mutex_lock(&next->lock); | |
1121 | return next; | |
1122 | } | |
29b3822f JJ |
1123 | ns = parent; |
1124 | parent = parent->parent; | |
1125 | } | |
1126 | ||
1127 | return NULL; | |
1128 | } | |
1129 | ||
1130 | /** | |
1131 | * __first_profile - find the first profile in a namespace | |
1132 | * @root: namespace that is root of profiles being displayed (NOT NULL) | |
1133 | * @ns: namespace to start in (NOT NULL) | |
1134 | * | |
1135 | * Returns: unrefcounted profile or NULL if no profile | |
1136 | * Requires: profile->ns.lock to be held | |
1137 | */ | |
98849dff JJ |
1138 | static struct aa_profile *__first_profile(struct aa_ns *root, |
1139 | struct aa_ns *ns) | |
29b3822f | 1140 | { |
98849dff | 1141 | for (; ns; ns = __next_ns(root, ns)) { |
29b3822f JJ |
1142 | if (!list_empty(&ns->base.profiles)) |
1143 | return list_first_entry(&ns->base.profiles, | |
1144 | struct aa_profile, base.list); | |
1145 | } | |
1146 | return NULL; | |
1147 | } | |
1148 | ||
1149 | /** | |
1150 | * __next_profile - step to the next profile in a profile tree | |
1151 | * @profile: current profile in tree (NOT NULL) | |
1152 | * | |
1153 | * Perform a depth first traversal on the profile tree in a namespace | |
1154 | * | |
1155 | * Returns: next profile or NULL if done | |
1156 | * Requires: profile->ns.lock to be held | |
1157 | */ | |
1158 | static struct aa_profile *__next_profile(struct aa_profile *p) | |
1159 | { | |
1160 | struct aa_profile *parent; | |
98849dff | 1161 | struct aa_ns *ns = p->ns; |
29b3822f JJ |
1162 | |
1163 | /* is next profile a child */ | |
1164 | if (!list_empty(&p->base.profiles)) | |
1165 | return list_first_entry(&p->base.profiles, typeof(*p), | |
1166 | base.list); | |
1167 | ||
1168 | /* is next profile a sibling, parent sibling, gp, sibling, .. */ | |
1169 | parent = rcu_dereference_protected(p->parent, | |
1170 | mutex_is_locked(&p->ns->lock)); | |
1171 | while (parent) { | |
38dbd7d8 | 1172 | p = list_next_entry(p, base.list); |
29b3822f JJ |
1173 | if (!list_entry_is_head(p, &parent->base.profiles, base.list)) |
1174 | return p; | |
1175 | p = parent; | |
1176 | parent = rcu_dereference_protected(parent->parent, | |
1177 | mutex_is_locked(&parent->ns->lock)); | |
1178 | } | |
1179 | ||
1180 | /* is next another profile in the namespace */ | |
38dbd7d8 | 1181 | p = list_next_entry(p, base.list); |
29b3822f JJ |
1182 | if (!list_entry_is_head(p, &ns->base.profiles, base.list)) |
1183 | return p; | |
1184 | ||
1185 | return NULL; | |
1186 | } | |
1187 | ||
1188 | /** | |
1189 | * next_profile - step to the next profile in where ever it may be | |
1190 | * @root: root namespace (NOT NULL) | |
1191 | * @profile: current profile (NOT NULL) | |
1192 | * | |
1193 | * Returns: next profile or NULL if there isn't one | |
1194 | */ | |
98849dff | 1195 | static struct aa_profile *next_profile(struct aa_ns *root, |
29b3822f JJ |
1196 | struct aa_profile *profile) |
1197 | { | |
1198 | struct aa_profile *next = __next_profile(profile); | |
1199 | if (next) | |
1200 | return next; | |
1201 | ||
1202 | /* finished all profiles in namespace move to next namespace */ | |
98849dff | 1203 | return __first_profile(root, __next_ns(root, profile->ns)); |
29b3822f JJ |
1204 | } |
1205 | ||
1206 | /** | |
1207 | * p_start - start a depth first traversal of profile tree | |
1208 | * @f: seq_file to fill | |
1209 | * @pos: current position | |
1210 | * | |
1211 | * Returns: first profile under current namespace or NULL if none found | |
1212 | * | |
1213 | * acquires first ns->lock | |
1214 | */ | |
1215 | static void *p_start(struct seq_file *f, loff_t *pos) | |
1216 | { | |
1217 | struct aa_profile *profile = NULL; | |
98849dff | 1218 | struct aa_ns *root = aa_current_profile()->ns; |
29b3822f | 1219 | loff_t l = *pos; |
98849dff | 1220 | f->private = aa_get_ns(root); |
29b3822f JJ |
1221 | |
1222 | ||
1223 | /* find the first profile */ | |
1224 | mutex_lock(&root->lock); | |
1225 | profile = __first_profile(root, root); | |
1226 | ||
1227 | /* skip to position */ | |
1228 | for (; profile && l > 0; l--) | |
1229 | profile = next_profile(root, profile); | |
1230 | ||
1231 | return profile; | |
1232 | } | |
1233 | ||
1234 | /** | |
1235 | * p_next - read the next profile entry | |
1236 | * @f: seq_file to fill | |
1237 | * @p: profile previously returned | |
1238 | * @pos: current position | |
1239 | * | |
1240 | * Returns: next profile after @p or NULL if none | |
1241 | * | |
1242 | * may acquire/release locks in namespace tree as necessary | |
1243 | */ | |
1244 | static void *p_next(struct seq_file *f, void *p, loff_t *pos) | |
1245 | { | |
1246 | struct aa_profile *profile = p; | |
98849dff | 1247 | struct aa_ns *ns = f->private; |
29b3822f JJ |
1248 | (*pos)++; |
1249 | ||
1250 | return next_profile(ns, profile); | |
1251 | } | |
1252 | ||
1253 | /** | |
1254 | * p_stop - stop depth first traversal | |
1255 | * @f: seq_file we are filling | |
1256 | * @p: the last profile writen | |
1257 | * | |
1258 | * Release all locking done by p_start/p_next on namespace tree | |
1259 | */ | |
1260 | static void p_stop(struct seq_file *f, void *p) | |
1261 | { | |
1262 | struct aa_profile *profile = p; | |
98849dff | 1263 | struct aa_ns *root = f->private, *ns; |
29b3822f JJ |
1264 | |
1265 | if (profile) { | |
1266 | for (ns = profile->ns; ns && ns != root; ns = ns->parent) | |
1267 | mutex_unlock(&ns->lock); | |
1268 | } | |
1269 | mutex_unlock(&root->lock); | |
98849dff | 1270 | aa_put_ns(root); |
29b3822f JJ |
1271 | } |
1272 | ||
1273 | /** | |
1274 | * seq_show_profile - show a profile entry | |
1275 | * @f: seq_file to file | |
1276 | * @p: current position (profile) (NOT NULL) | |
1277 | * | |
1278 | * Returns: error on failure | |
1279 | */ | |
1280 | static int seq_show_profile(struct seq_file *f, void *p) | |
1281 | { | |
1282 | struct aa_profile *profile = (struct aa_profile *)p; | |
98849dff | 1283 | struct aa_ns *root = f->private; |
29b3822f JJ |
1284 | |
1285 | if (profile->ns != root) | |
92b6d8ef | 1286 | seq_printf(f, ":%s://", aa_ns_name(root, profile->ns, true)); |
29b3822f JJ |
1287 | seq_printf(f, "%s (%s)\n", profile->base.hname, |
1288 | aa_profile_mode_names[profile->mode]); | |
1289 | ||
1290 | return 0; | |
1291 | } | |
1292 | ||
1293 | static const struct seq_operations aa_fs_profiles_op = { | |
1294 | .start = p_start, | |
1295 | .next = p_next, | |
1296 | .stop = p_stop, | |
1297 | .show = seq_show_profile, | |
1298 | }; | |
1299 | ||
1300 | static int profiles_open(struct inode *inode, struct file *file) | |
1301 | { | |
5ac8c355 JJ |
1302 | if (!policy_view_capable(NULL)) |
1303 | return -EACCES; | |
1304 | ||
29b3822f JJ |
1305 | return seq_open(file, &aa_fs_profiles_op); |
1306 | } | |
1307 | ||
1308 | static int profiles_release(struct inode *inode, struct file *file) | |
1309 | { | |
1310 | return seq_release(inode, file); | |
1311 | } | |
1312 | ||
1313 | static const struct file_operations aa_fs_profiles_fops = { | |
1314 | .open = profiles_open, | |
1315 | .read = seq_read, | |
1316 | .llseek = seq_lseek, | |
1317 | .release = profiles_release, | |
1318 | }; | |
1319 | ||
1320 | ||
0d259f04 | 1321 | /** Base file system setup **/ |
a9bf8e9f KC |
1322 | static struct aa_fs_entry aa_fs_entry_file[] = { |
1323 | AA_FS_FILE_STRING("mask", "create read write exec append mmap_exec " \ | |
1324 | "link lock"), | |
1325 | { } | |
1326 | }; | |
1327 | ||
e74abcf3 KC |
1328 | static struct aa_fs_entry aa_fs_entry_domain[] = { |
1329 | AA_FS_FILE_BOOLEAN("change_hat", 1), | |
1330 | AA_FS_FILE_BOOLEAN("change_hatv", 1), | |
1331 | AA_FS_FILE_BOOLEAN("change_onexec", 1), | |
1332 | AA_FS_FILE_BOOLEAN("change_profile", 1), | |
34c426ac | 1333 | AA_FS_FILE_BOOLEAN("fix_binfmt_elf_mmap", 1), |
aa9a39ad | 1334 | AA_FS_FILE_STRING("version", "1.2"), |
e74abcf3 KC |
1335 | { } |
1336 | }; | |
1337 | ||
474d6b75 JJ |
1338 | static struct aa_fs_entry aa_fs_entry_versions[] = { |
1339 | AA_FS_FILE_BOOLEAN("v5", 1), | |
1340 | { } | |
1341 | }; | |
1342 | ||
9d910a3b | 1343 | static struct aa_fs_entry aa_fs_entry_policy[] = { |
474d6b75 JJ |
1344 | AA_FS_DIR("versions", aa_fs_entry_versions), |
1345 | AA_FS_FILE_BOOLEAN("set_load", 1), | |
1346 | { } | |
9d910a3b JJ |
1347 | }; |
1348 | ||
e74abcf3 | 1349 | static struct aa_fs_entry aa_fs_entry_features[] = { |
9d910a3b | 1350 | AA_FS_DIR("policy", aa_fs_entry_policy), |
e74abcf3 | 1351 | AA_FS_DIR("domain", aa_fs_entry_domain), |
a9bf8e9f | 1352 | AA_FS_DIR("file", aa_fs_entry_file), |
e74abcf3 | 1353 | AA_FS_FILE_U64("capability", VFS_CAP_FLAGS_MASK), |
d384b0a1 | 1354 | AA_FS_DIR("rlimit", aa_fs_entry_rlimit), |
84f1f787 | 1355 | AA_FS_DIR("caps", aa_fs_entry_caps), |
e74abcf3 KC |
1356 | { } |
1357 | }; | |
1358 | ||
9acd494b | 1359 | static struct aa_fs_entry aa_fs_entry_apparmor[] = { |
e025be0f | 1360 | AA_FS_FILE_FOPS(".access", 0640, &aa_fs_access), |
64c86970 JJ |
1361 | AA_FS_FILE_FOPS(".ns_level", 0666, &seq_ns_level_fops), |
1362 | AA_FS_FILE_FOPS(".ns_name", 0640, &seq_ns_name_fops), | |
b7fd2c03 | 1363 | AA_FS_FILE_FOPS("profiles", 0440, &aa_fs_profiles_fops), |
e74abcf3 | 1364 | AA_FS_DIR("features", aa_fs_entry_features), |
9acd494b KC |
1365 | { } |
1366 | }; | |
63e2b423 | 1367 | |
9acd494b KC |
1368 | static struct aa_fs_entry aa_fs_entry = |
1369 | AA_FS_DIR("apparmor", aa_fs_entry_apparmor); | |
63e2b423 | 1370 | |
9acd494b KC |
1371 | /** |
1372 | * aafs_create_file - create a file entry in the apparmor securityfs | |
1373 | * @fs_file: aa_fs_entry to build an entry for (NOT NULL) | |
1374 | * @parent: the parent dentry in the securityfs | |
1375 | * | |
1376 | * Use aafs_remove_file to remove entries created with this fn. | |
1377 | */ | |
1378 | static int __init aafs_create_file(struct aa_fs_entry *fs_file, | |
1379 | struct dentry *parent) | |
1380 | { | |
1381 | int error = 0; | |
1382 | ||
1383 | fs_file->dentry = securityfs_create_file(fs_file->name, | |
1384 | S_IFREG | fs_file->mode, | |
1385 | parent, fs_file, | |
1386 | fs_file->file_ops); | |
1387 | if (IS_ERR(fs_file->dentry)) { | |
1388 | error = PTR_ERR(fs_file->dentry); | |
1389 | fs_file->dentry = NULL; | |
63e2b423 | 1390 | } |
9acd494b | 1391 | return error; |
63e2b423 JJ |
1392 | } |
1393 | ||
0d259f04 | 1394 | static void __init aafs_remove_dir(struct aa_fs_entry *fs_dir); |
63e2b423 | 1395 | /** |
9acd494b KC |
1396 | * aafs_create_dir - recursively create a directory entry in the securityfs |
1397 | * @fs_dir: aa_fs_entry (and all child entries) to build (NOT NULL) | |
1398 | * @parent: the parent dentry in the securityfs | |
63e2b423 | 1399 | * |
9acd494b | 1400 | * Use aafs_remove_dir to remove entries created with this fn. |
63e2b423 | 1401 | */ |
9acd494b KC |
1402 | static int __init aafs_create_dir(struct aa_fs_entry *fs_dir, |
1403 | struct dentry *parent) | |
63e2b423 | 1404 | { |
9acd494b | 1405 | struct aa_fs_entry *fs_file; |
0d259f04 JJ |
1406 | struct dentry *dir; |
1407 | int error; | |
63e2b423 | 1408 | |
0d259f04 JJ |
1409 | dir = securityfs_create_dir(fs_dir->name, parent); |
1410 | if (IS_ERR(dir)) | |
1411 | return PTR_ERR(dir); | |
1412 | fs_dir->dentry = dir; | |
63e2b423 | 1413 | |
0d259f04 | 1414 | for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) { |
9acd494b KC |
1415 | if (fs_file->v_type == AA_FS_TYPE_DIR) |
1416 | error = aafs_create_dir(fs_file, fs_dir->dentry); | |
1417 | else | |
1418 | error = aafs_create_file(fs_file, fs_dir->dentry); | |
1419 | if (error) | |
1420 | goto failed; | |
1421 | } | |
1422 | ||
1423 | return 0; | |
1424 | ||
1425 | failed: | |
0d259f04 JJ |
1426 | aafs_remove_dir(fs_dir); |
1427 | ||
9acd494b KC |
1428 | return error; |
1429 | } | |
1430 | ||
1431 | /** | |
1432 | * aafs_remove_file - drop a single file entry in the apparmor securityfs | |
1433 | * @fs_file: aa_fs_entry to detach from the securityfs (NOT NULL) | |
1434 | */ | |
1435 | static void __init aafs_remove_file(struct aa_fs_entry *fs_file) | |
1436 | { | |
1437 | if (!fs_file->dentry) | |
1438 | return; | |
1439 | ||
1440 | securityfs_remove(fs_file->dentry); | |
1441 | fs_file->dentry = NULL; | |
1442 | } | |
1443 | ||
1444 | /** | |
1445 | * aafs_remove_dir - recursively drop a directory entry from the securityfs | |
1446 | * @fs_dir: aa_fs_entry (and all child entries) to detach (NOT NULL) | |
1447 | */ | |
1448 | static void __init aafs_remove_dir(struct aa_fs_entry *fs_dir) | |
1449 | { | |
1450 | struct aa_fs_entry *fs_file; | |
1451 | ||
0d259f04 | 1452 | for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) { |
9acd494b KC |
1453 | if (fs_file->v_type == AA_FS_TYPE_DIR) |
1454 | aafs_remove_dir(fs_file); | |
1455 | else | |
1456 | aafs_remove_file(fs_file); | |
1457 | } | |
1458 | ||
1459 | aafs_remove_file(fs_dir); | |
63e2b423 JJ |
1460 | } |
1461 | ||
1462 | /** | |
1463 | * aa_destroy_aafs - cleanup and free aafs | |
1464 | * | |
1465 | * releases dentries allocated by aa_create_aafs | |
1466 | */ | |
1467 | void __init aa_destroy_aafs(void) | |
1468 | { | |
9acd494b | 1469 | aafs_remove_dir(&aa_fs_entry); |
63e2b423 JJ |
1470 | } |
1471 | ||
a71ada30 JJ |
1472 | |
1473 | #define NULL_FILE_NAME ".null" | |
1474 | struct path aa_null; | |
1475 | ||
1476 | static int aa_mk_null_file(struct dentry *parent) | |
1477 | { | |
1478 | struct vfsmount *mount = NULL; | |
1479 | struct dentry *dentry; | |
1480 | struct inode *inode; | |
1481 | int count = 0; | |
1482 | int error = simple_pin_fs(parent->d_sb->s_type, &mount, &count); | |
1483 | ||
1484 | if (error) | |
1485 | return error; | |
1486 | ||
1487 | inode_lock(d_inode(parent)); | |
1488 | dentry = lookup_one_len(NULL_FILE_NAME, parent, strlen(NULL_FILE_NAME)); | |
1489 | if (IS_ERR(dentry)) { | |
1490 | error = PTR_ERR(dentry); | |
1491 | goto out; | |
1492 | } | |
1493 | inode = new_inode(parent->d_inode->i_sb); | |
1494 | if (!inode) { | |
1495 | error = -ENOMEM; | |
1496 | goto out1; | |
1497 | } | |
1498 | ||
1499 | inode->i_ino = get_next_ino(); | |
1500 | inode->i_mode = S_IFCHR | S_IRUGO | S_IWUGO; | |
24d0d03c | 1501 | inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
a71ada30 JJ |
1502 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, |
1503 | MKDEV(MEM_MAJOR, 3)); | |
1504 | d_instantiate(dentry, inode); | |
1505 | aa_null.dentry = dget(dentry); | |
1506 | aa_null.mnt = mntget(mount); | |
1507 | ||
1508 | error = 0; | |
1509 | ||
1510 | out1: | |
1511 | dput(dentry); | |
1512 | out: | |
1513 | inode_unlock(d_inode(parent)); | |
1514 | simple_release_fs(&mount, &count); | |
1515 | return error; | |
1516 | } | |
1517 | ||
63e2b423 JJ |
1518 | /** |
1519 | * aa_create_aafs - create the apparmor security filesystem | |
1520 | * | |
1521 | * dentries created here are released by aa_destroy_aafs | |
1522 | * | |
1523 | * Returns: error on failure | |
1524 | */ | |
3417d8d5 | 1525 | static int __init aa_create_aafs(void) |
63e2b423 | 1526 | { |
b7fd2c03 | 1527 | struct dentry *dent; |
63e2b423 JJ |
1528 | int error; |
1529 | ||
1530 | if (!apparmor_initialized) | |
1531 | return 0; | |
1532 | ||
9acd494b | 1533 | if (aa_fs_entry.dentry) { |
63e2b423 JJ |
1534 | AA_ERROR("%s: AppArmor securityfs already exists\n", __func__); |
1535 | return -EEXIST; | |
1536 | } | |
1537 | ||
9acd494b KC |
1538 | /* Populate fs tree. */ |
1539 | error = aafs_create_dir(&aa_fs_entry, NULL); | |
63e2b423 JJ |
1540 | if (error) |
1541 | goto error; | |
1542 | ||
b7fd2c03 JJ |
1543 | dent = securityfs_create_file(".load", 0666, aa_fs_entry.dentry, |
1544 | NULL, &aa_fs_profile_load); | |
1545 | if (IS_ERR(dent)) { | |
1546 | error = PTR_ERR(dent); | |
1547 | goto error; | |
1548 | } | |
1549 | ns_subload(root_ns) = dent; | |
1550 | ||
1551 | dent = securityfs_create_file(".replace", 0666, aa_fs_entry.dentry, | |
1552 | NULL, &aa_fs_profile_replace); | |
1553 | if (IS_ERR(dent)) { | |
1554 | error = PTR_ERR(dent); | |
1555 | goto error; | |
1556 | } | |
1557 | ns_subreplace(root_ns) = dent; | |
1558 | ||
1559 | dent = securityfs_create_file(".remove", 0666, aa_fs_entry.dentry, | |
1560 | NULL, &aa_fs_profile_remove); | |
1561 | if (IS_ERR(dent)) { | |
1562 | error = PTR_ERR(dent); | |
1563 | goto error; | |
1564 | } | |
1565 | ns_subremove(root_ns) = dent; | |
1566 | ||
1567 | mutex_lock(&root_ns->lock); | |
98849dff | 1568 | error = __aa_fs_ns_mkdir(root_ns, aa_fs_entry.dentry, "policy"); |
b7fd2c03 JJ |
1569 | mutex_unlock(&root_ns->lock); |
1570 | ||
0d259f04 JJ |
1571 | if (error) |
1572 | goto error; | |
1573 | ||
a71ada30 JJ |
1574 | error = aa_mk_null_file(aa_fs_entry.dentry); |
1575 | if (error) | |
1576 | goto error; | |
1577 | ||
1578 | /* TODO: add default profile to apparmorfs */ | |
63e2b423 JJ |
1579 | |
1580 | /* Report that AppArmor fs is enabled */ | |
1581 | aa_info_message("AppArmor Filesystem Enabled"); | |
1582 | return 0; | |
1583 | ||
1584 | error: | |
1585 | aa_destroy_aafs(); | |
1586 | AA_ERROR("Error creating AppArmor securityfs\n"); | |
1587 | return error; | |
1588 | } | |
1589 | ||
1590 | fs_initcall(aa_create_aafs); |