Commit | Line | Data |
---|---|---|
b69a54ee KT |
1 | /* |
2 | * security/tomoyo/file.c | |
3 | * | |
4 | * Implementation of the Domain-Based Mandatory Access Control. | |
5 | * | |
6 | * Copyright (C) 2005-2009 NTT DATA CORPORATION | |
7 | * | |
39826a1e | 8 | * Version: 2.2.0 2009/04/01 |
b69a54ee KT |
9 | * |
10 | */ | |
11 | ||
12 | #include "common.h" | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
b69a54ee KT |
14 | |
15 | /* Keyword array for single path operations. */ | |
7ef61233 TH |
16 | static const char *tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = { |
17 | [TOMOYO_TYPE_READ_WRITE] = "read/write", | |
18 | [TOMOYO_TYPE_EXECUTE] = "execute", | |
19 | [TOMOYO_TYPE_READ] = "read", | |
20 | [TOMOYO_TYPE_WRITE] = "write", | |
21 | [TOMOYO_TYPE_CREATE] = "create", | |
22 | [TOMOYO_TYPE_UNLINK] = "unlink", | |
23 | [TOMOYO_TYPE_MKDIR] = "mkdir", | |
24 | [TOMOYO_TYPE_RMDIR] = "rmdir", | |
25 | [TOMOYO_TYPE_MKFIFO] = "mkfifo", | |
26 | [TOMOYO_TYPE_MKSOCK] = "mksock", | |
27 | [TOMOYO_TYPE_MKBLOCK] = "mkblock", | |
28 | [TOMOYO_TYPE_MKCHAR] = "mkchar", | |
29 | [TOMOYO_TYPE_TRUNCATE] = "truncate", | |
30 | [TOMOYO_TYPE_SYMLINK] = "symlink", | |
31 | [TOMOYO_TYPE_REWRITE] = "rewrite", | |
32 | [TOMOYO_TYPE_IOCTL] = "ioctl", | |
33 | [TOMOYO_TYPE_CHMOD] = "chmod", | |
34 | [TOMOYO_TYPE_CHOWN] = "chown", | |
35 | [TOMOYO_TYPE_CHGRP] = "chgrp", | |
36 | [TOMOYO_TYPE_CHROOT] = "chroot", | |
37 | [TOMOYO_TYPE_MOUNT] = "mount", | |
38 | [TOMOYO_TYPE_UMOUNT] = "unmount", | |
b69a54ee KT |
39 | }; |
40 | ||
41 | /* Keyword array for double path operations. */ | |
7ef61233 TH |
42 | static const char *tomoyo_path2_keyword[TOMOYO_MAX_PATH2_OPERATION] = { |
43 | [TOMOYO_TYPE_LINK] = "link", | |
44 | [TOMOYO_TYPE_RENAME] = "rename", | |
45 | [TOMOYO_TYPE_PIVOT_ROOT] = "pivot_root", | |
b69a54ee KT |
46 | }; |
47 | ||
7762fbff TH |
48 | void tomoyo_put_name_union(struct tomoyo_name_union *ptr) |
49 | { | |
50 | if (!ptr) | |
51 | return; | |
52 | if (ptr->is_group) | |
53 | tomoyo_put_path_group(ptr->group); | |
54 | else | |
55 | tomoyo_put_name(ptr->filename); | |
56 | } | |
57 | ||
58 | bool tomoyo_compare_name_union(const struct tomoyo_path_info *name, | |
59 | const struct tomoyo_name_union *ptr) | |
60 | { | |
61 | if (ptr->is_group) | |
62 | return tomoyo_path_matches_group(name, ptr->group, 1); | |
63 | return tomoyo_path_matches_pattern(name, ptr->filename); | |
64 | } | |
65 | ||
66 | static bool tomoyo_compare_name_union_pattern(const struct tomoyo_path_info | |
67 | *name, | |
68 | const struct tomoyo_name_union | |
69 | *ptr, const bool may_use_pattern) | |
70 | { | |
71 | if (ptr->is_group) | |
72 | return tomoyo_path_matches_group(name, ptr->group, | |
73 | may_use_pattern); | |
74 | if (may_use_pattern || !ptr->filename->is_patterned) | |
75 | return tomoyo_path_matches_pattern(name, ptr->filename); | |
76 | return false; | |
77 | } | |
78 | ||
b69a54ee | 79 | /** |
7ef61233 | 80 | * tomoyo_path2keyword - Get the name of single path operation. |
b69a54ee KT |
81 | * |
82 | * @operation: Type of operation. | |
83 | * | |
84 | * Returns the name of single path operation. | |
85 | */ | |
7ef61233 | 86 | const char *tomoyo_path2keyword(const u8 operation) |
b69a54ee | 87 | { |
7ef61233 TH |
88 | return (operation < TOMOYO_MAX_PATH_OPERATION) |
89 | ? tomoyo_path_keyword[operation] : NULL; | |
b69a54ee KT |
90 | } |
91 | ||
92 | /** | |
7ef61233 | 93 | * tomoyo_path22keyword - Get the name of double path operation. |
b69a54ee KT |
94 | * |
95 | * @operation: Type of operation. | |
96 | * | |
97 | * Returns the name of double path operation. | |
98 | */ | |
7ef61233 | 99 | const char *tomoyo_path22keyword(const u8 operation) |
b69a54ee | 100 | { |
7ef61233 TH |
101 | return (operation < TOMOYO_MAX_PATH2_OPERATION) |
102 | ? tomoyo_path2_keyword[operation] : NULL; | |
b69a54ee KT |
103 | } |
104 | ||
105 | /** | |
106 | * tomoyo_strendswith - Check whether the token ends with the given token. | |
107 | * | |
108 | * @name: The token to check. | |
109 | * @tail: The token to find. | |
110 | * | |
111 | * Returns true if @name ends with @tail, false otherwise. | |
112 | */ | |
113 | static bool tomoyo_strendswith(const char *name, const char *tail) | |
114 | { | |
115 | int len; | |
116 | ||
117 | if (!name || !tail) | |
118 | return false; | |
119 | len = strlen(name) - strlen(tail); | |
120 | return len >= 0 && !strcmp(name + len, tail); | |
121 | } | |
122 | ||
123 | /** | |
124 | * tomoyo_get_path - Get realpath. | |
125 | * | |
126 | * @path: Pointer to "struct path". | |
127 | * | |
128 | * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise. | |
129 | */ | |
130 | static struct tomoyo_path_info *tomoyo_get_path(struct path *path) | |
131 | { | |
132 | int error; | |
8e2d39a1 | 133 | struct tomoyo_path_info_with_data *buf = kzalloc(sizeof(*buf), |
4e5d6f7e | 134 | GFP_NOFS); |
b69a54ee KT |
135 | |
136 | if (!buf) | |
137 | return NULL; | |
138 | /* Reserve one byte for appending "/". */ | |
139 | error = tomoyo_realpath_from_path2(path, buf->body, | |
140 | sizeof(buf->body) - 2); | |
141 | if (!error) { | |
142 | buf->head.name = buf->body; | |
143 | tomoyo_fill_path_info(&buf->head); | |
144 | return &buf->head; | |
145 | } | |
8e2d39a1 | 146 | kfree(buf); |
b69a54ee KT |
147 | return NULL; |
148 | } | |
149 | ||
7ef61233 TH |
150 | static int tomoyo_update_path2_acl(const u8 type, const char *filename1, |
151 | const char *filename2, | |
152 | struct tomoyo_domain_info *const domain, | |
153 | const bool is_delete); | |
154 | static int tomoyo_update_path_acl(const u8 type, const char *filename, | |
155 | struct tomoyo_domain_info *const domain, | |
156 | const bool is_delete); | |
b69a54ee | 157 | |
c3fa109a TH |
158 | /* |
159 | * tomoyo_globally_readable_list is used for holding list of pathnames which | |
160 | * are by default allowed to be open()ed for reading by any process. | |
161 | * | |
162 | * An entry is added by | |
163 | * | |
164 | * # echo 'allow_read /lib/libc-2.5.so' > \ | |
165 | * /sys/kernel/security/tomoyo/exception_policy | |
166 | * | |
167 | * and is deleted by | |
168 | * | |
169 | * # echo 'delete allow_read /lib/libc-2.5.so' > \ | |
170 | * /sys/kernel/security/tomoyo/exception_policy | |
171 | * | |
172 | * and all entries are retrieved by | |
173 | * | |
174 | * # grep ^allow_read /sys/kernel/security/tomoyo/exception_policy | |
175 | * | |
176 | * In the example above, any process is allowed to | |
177 | * open("/lib/libc-2.5.so", O_RDONLY). | |
178 | * One exception is, if the domain which current process belongs to is marked | |
179 | * as "ignore_global_allow_read", current process can't do so unless explicitly | |
180 | * given "allow_read /lib/libc-2.5.so" to the domain which current process | |
181 | * belongs to. | |
182 | */ | |
847b173e | 183 | LIST_HEAD(tomoyo_globally_readable_list); |
b69a54ee KT |
184 | |
185 | /** | |
186 | * tomoyo_update_globally_readable_entry - Update "struct tomoyo_globally_readable_file_entry" list. | |
187 | * | |
188 | * @filename: Filename unconditionally permitted to open() for reading. | |
189 | * @is_delete: True if it is a delete request. | |
190 | * | |
191 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
192 | * |
193 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
194 | */ |
195 | static int tomoyo_update_globally_readable_entry(const char *filename, | |
196 | const bool is_delete) | |
197 | { | |
b69a54ee | 198 | struct tomoyo_globally_readable_file_entry *ptr; |
9e4b50e9 | 199 | struct tomoyo_globally_readable_file_entry e = { }; |
ca0b7df3 | 200 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 201 | |
17080008 | 202 | if (!tomoyo_is_correct_path(filename, 1, 0, -1)) |
b69a54ee | 203 | return -EINVAL; |
9e4b50e9 TH |
204 | e.filename = tomoyo_get_name(filename); |
205 | if (!e.filename) | |
b69a54ee | 206 | return -ENOMEM; |
29282381 TH |
207 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
208 | goto out; | |
fdb8ebb7 | 209 | list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { |
9e4b50e9 | 210 | if (ptr->filename != e.filename) |
b69a54ee KT |
211 | continue; |
212 | ptr->is_deleted = is_delete; | |
213 | error = 0; | |
ca0b7df3 | 214 | break; |
b69a54ee | 215 | } |
9e4b50e9 TH |
216 | if (!is_delete && error) { |
217 | struct tomoyo_globally_readable_file_entry *entry = | |
218 | tomoyo_commit_ok(&e, sizeof(e)); | |
219 | if (entry) { | |
220 | list_add_tail_rcu(&entry->list, | |
221 | &tomoyo_globally_readable_list); | |
222 | error = 0; | |
223 | } | |
b69a54ee | 224 | } |
f737d95d | 225 | mutex_unlock(&tomoyo_policy_lock); |
29282381 | 226 | out: |
9e4b50e9 | 227 | tomoyo_put_name(e.filename); |
b69a54ee KT |
228 | return error; |
229 | } | |
230 | ||
231 | /** | |
232 | * tomoyo_is_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading. | |
233 | * | |
234 | * @filename: The filename to check. | |
235 | * | |
236 | * Returns true if any domain can open @filename for reading, false otherwise. | |
fdb8ebb7 TH |
237 | * |
238 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
239 | */ |
240 | static bool tomoyo_is_globally_readable_file(const struct tomoyo_path_info * | |
241 | filename) | |
242 | { | |
243 | struct tomoyo_globally_readable_file_entry *ptr; | |
244 | bool found = false; | |
fdb8ebb7 TH |
245 | |
246 | list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { | |
b69a54ee KT |
247 | if (!ptr->is_deleted && |
248 | tomoyo_path_matches_pattern(filename, ptr->filename)) { | |
249 | found = true; | |
250 | break; | |
251 | } | |
252 | } | |
b69a54ee KT |
253 | return found; |
254 | } | |
255 | ||
256 | /** | |
257 | * tomoyo_write_globally_readable_policy - Write "struct tomoyo_globally_readable_file_entry" list. | |
258 | * | |
259 | * @data: String to parse. | |
260 | * @is_delete: True if it is a delete request. | |
261 | * | |
262 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
263 | * |
264 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
265 | */ |
266 | int tomoyo_write_globally_readable_policy(char *data, const bool is_delete) | |
267 | { | |
268 | return tomoyo_update_globally_readable_entry(data, is_delete); | |
269 | } | |
270 | ||
271 | /** | |
272 | * tomoyo_read_globally_readable_policy - Read "struct tomoyo_globally_readable_file_entry" list. | |
273 | * | |
274 | * @head: Pointer to "struct tomoyo_io_buffer". | |
275 | * | |
276 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
277 | * |
278 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
279 | */ |
280 | bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head) | |
281 | { | |
282 | struct list_head *pos; | |
283 | bool done = true; | |
284 | ||
b69a54ee KT |
285 | list_for_each_cookie(pos, head->read_var2, |
286 | &tomoyo_globally_readable_list) { | |
287 | struct tomoyo_globally_readable_file_entry *ptr; | |
288 | ptr = list_entry(pos, | |
289 | struct tomoyo_globally_readable_file_entry, | |
290 | list); | |
291 | if (ptr->is_deleted) | |
292 | continue; | |
7d2948b1 TH |
293 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_READ "%s\n", |
294 | ptr->filename->name); | |
295 | if (!done) | |
b69a54ee | 296 | break; |
b69a54ee | 297 | } |
b69a54ee KT |
298 | return done; |
299 | } | |
300 | ||
c3fa109a TH |
301 | /* tomoyo_pattern_list is used for holding list of pathnames which are used for |
302 | * converting pathnames to pathname patterns during learning mode. | |
303 | * | |
304 | * An entry is added by | |
305 | * | |
306 | * # echo 'file_pattern /proc/\$/mounts' > \ | |
307 | * /sys/kernel/security/tomoyo/exception_policy | |
308 | * | |
309 | * and is deleted by | |
310 | * | |
311 | * # echo 'delete file_pattern /proc/\$/mounts' > \ | |
312 | * /sys/kernel/security/tomoyo/exception_policy | |
313 | * | |
314 | * and all entries are retrieved by | |
315 | * | |
316 | * # grep ^file_pattern /sys/kernel/security/tomoyo/exception_policy | |
317 | * | |
318 | * In the example above, if a process which belongs to a domain which is in | |
319 | * learning mode requested open("/proc/1/mounts", O_RDONLY), | |
320 | * "allow_read /proc/\$/mounts" is automatically added to the domain which that | |
321 | * process belongs to. | |
322 | * | |
323 | * It is not a desirable behavior that we have to use /proc/\$/ instead of | |
324 | * /proc/self/ when current process needs to access only current process's | |
325 | * information. As of now, LSM version of TOMOYO is using __d_path() for | |
326 | * calculating pathname. Non LSM version of TOMOYO is using its own function | |
327 | * which pretends as if /proc/self/ is not a symlink; so that we can forbid | |
328 | * current process from accessing other process's information. | |
329 | */ | |
847b173e | 330 | LIST_HEAD(tomoyo_pattern_list); |
b69a54ee KT |
331 | |
332 | /** | |
333 | * tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list. | |
334 | * | |
335 | * @pattern: Pathname pattern. | |
336 | * @is_delete: True if it is a delete request. | |
337 | * | |
338 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
339 | * |
340 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
341 | */ |
342 | static int tomoyo_update_file_pattern_entry(const char *pattern, | |
343 | const bool is_delete) | |
344 | { | |
b69a54ee | 345 | struct tomoyo_pattern_entry *ptr; |
9e4b50e9 | 346 | struct tomoyo_pattern_entry e = { .pattern = tomoyo_get_name(pattern) }; |
ca0b7df3 | 347 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 348 | |
9e4b50e9 | 349 | if (!e.pattern) |
ca0b7df3 | 350 | return error; |
9e4b50e9 | 351 | if (!e.pattern->is_patterned) |
ca0b7df3 | 352 | goto out; |
29282381 TH |
353 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
354 | goto out; | |
fdb8ebb7 | 355 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { |
9e4b50e9 | 356 | if (e.pattern != ptr->pattern) |
b69a54ee KT |
357 | continue; |
358 | ptr->is_deleted = is_delete; | |
359 | error = 0; | |
ca0b7df3 | 360 | break; |
b69a54ee | 361 | } |
9e4b50e9 TH |
362 | if (!is_delete && error) { |
363 | struct tomoyo_pattern_entry *entry = | |
364 | tomoyo_commit_ok(&e, sizeof(e)); | |
365 | if (entry) { | |
366 | list_add_tail_rcu(&entry->list, &tomoyo_pattern_list); | |
367 | error = 0; | |
368 | } | |
b69a54ee | 369 | } |
f737d95d | 370 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 371 | out: |
9e4b50e9 | 372 | tomoyo_put_name(e.pattern); |
b69a54ee KT |
373 | return error; |
374 | } | |
375 | ||
376 | /** | |
377 | * tomoyo_get_file_pattern - Get patterned pathname. | |
378 | * | |
379 | * @filename: The filename to find patterned pathname. | |
380 | * | |
381 | * Returns pointer to pathname pattern if matched, @filename otherwise. | |
fdb8ebb7 TH |
382 | * |
383 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
384 | */ |
385 | static const struct tomoyo_path_info * | |
386 | tomoyo_get_file_pattern(const struct tomoyo_path_info *filename) | |
387 | { | |
388 | struct tomoyo_pattern_entry *ptr; | |
389 | const struct tomoyo_path_info *pattern = NULL; | |
390 | ||
fdb8ebb7 | 391 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { |
b69a54ee KT |
392 | if (ptr->is_deleted) |
393 | continue; | |
394 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
395 | continue; | |
396 | pattern = ptr->pattern; | |
397 | if (tomoyo_strendswith(pattern->name, "/\\*")) { | |
398 | /* Do nothing. Try to find the better match. */ | |
399 | } else { | |
400 | /* This would be the better match. Use this. */ | |
401 | break; | |
402 | } | |
403 | } | |
b69a54ee KT |
404 | if (pattern) |
405 | filename = pattern; | |
406 | return filename; | |
407 | } | |
408 | ||
409 | /** | |
410 | * tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list. | |
411 | * | |
412 | * @data: String to parse. | |
413 | * @is_delete: True if it is a delete request. | |
414 | * | |
415 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
416 | * |
417 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
418 | */ |
419 | int tomoyo_write_pattern_policy(char *data, const bool is_delete) | |
420 | { | |
421 | return tomoyo_update_file_pattern_entry(data, is_delete); | |
422 | } | |
423 | ||
424 | /** | |
425 | * tomoyo_read_file_pattern - Read "struct tomoyo_pattern_entry" list. | |
426 | * | |
427 | * @head: Pointer to "struct tomoyo_io_buffer". | |
428 | * | |
429 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
430 | * |
431 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
432 | */ |
433 | bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head) | |
434 | { | |
435 | struct list_head *pos; | |
436 | bool done = true; | |
437 | ||
b69a54ee KT |
438 | list_for_each_cookie(pos, head->read_var2, &tomoyo_pattern_list) { |
439 | struct tomoyo_pattern_entry *ptr; | |
440 | ptr = list_entry(pos, struct tomoyo_pattern_entry, list); | |
441 | if (ptr->is_deleted) | |
442 | continue; | |
7d2948b1 TH |
443 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_FILE_PATTERN |
444 | "%s\n", ptr->pattern->name); | |
445 | if (!done) | |
b69a54ee | 446 | break; |
b69a54ee | 447 | } |
b69a54ee KT |
448 | return done; |
449 | } | |
450 | ||
c3fa109a TH |
451 | /* |
452 | * tomoyo_no_rewrite_list is used for holding list of pathnames which are by | |
453 | * default forbidden to modify already written content of a file. | |
454 | * | |
455 | * An entry is added by | |
456 | * | |
457 | * # echo 'deny_rewrite /var/log/messages' > \ | |
458 | * /sys/kernel/security/tomoyo/exception_policy | |
459 | * | |
460 | * and is deleted by | |
461 | * | |
462 | * # echo 'delete deny_rewrite /var/log/messages' > \ | |
463 | * /sys/kernel/security/tomoyo/exception_policy | |
464 | * | |
465 | * and all entries are retrieved by | |
466 | * | |
467 | * # grep ^deny_rewrite /sys/kernel/security/tomoyo/exception_policy | |
468 | * | |
469 | * In the example above, if a process requested to rewrite /var/log/messages , | |
470 | * the process can't rewrite unless the domain which that process belongs to | |
471 | * has "allow_rewrite /var/log/messages" entry. | |
472 | * | |
473 | * It is not a desirable behavior that we have to add "\040(deleted)" suffix | |
474 | * when we want to allow rewriting already unlink()ed file. As of now, | |
475 | * LSM version of TOMOYO is using __d_path() for calculating pathname. | |
476 | * Non LSM version of TOMOYO is using its own function which doesn't append | |
477 | * " (deleted)" suffix if the file is already unlink()ed; so that we don't | |
478 | * need to worry whether the file is already unlink()ed or not. | |
479 | */ | |
847b173e | 480 | LIST_HEAD(tomoyo_no_rewrite_list); |
b69a54ee KT |
481 | |
482 | /** | |
483 | * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list. | |
484 | * | |
485 | * @pattern: Pathname pattern that are not rewritable by default. | |
486 | * @is_delete: True if it is a delete request. | |
487 | * | |
488 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
489 | * |
490 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
491 | */ |
492 | static int tomoyo_update_no_rewrite_entry(const char *pattern, | |
493 | const bool is_delete) | |
494 | { | |
ca0b7df3 | 495 | struct tomoyo_no_rewrite_entry *ptr; |
9e4b50e9 | 496 | struct tomoyo_no_rewrite_entry e = { }; |
ca0b7df3 | 497 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 498 | |
17080008 | 499 | if (!tomoyo_is_correct_path(pattern, 0, 0, 0)) |
b69a54ee | 500 | return -EINVAL; |
9e4b50e9 TH |
501 | e.pattern = tomoyo_get_name(pattern); |
502 | if (!e.pattern) | |
ca0b7df3 | 503 | return error; |
29282381 TH |
504 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
505 | goto out; | |
fdb8ebb7 | 506 | list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { |
9e4b50e9 | 507 | if (ptr->pattern != e.pattern) |
b69a54ee KT |
508 | continue; |
509 | ptr->is_deleted = is_delete; | |
510 | error = 0; | |
ca0b7df3 | 511 | break; |
b69a54ee | 512 | } |
9e4b50e9 TH |
513 | if (!is_delete && error) { |
514 | struct tomoyo_no_rewrite_entry *entry = | |
515 | tomoyo_commit_ok(&e, sizeof(e)); | |
516 | if (entry) { | |
517 | list_add_tail_rcu(&entry->list, | |
518 | &tomoyo_no_rewrite_list); | |
519 | error = 0; | |
520 | } | |
b69a54ee | 521 | } |
f737d95d | 522 | mutex_unlock(&tomoyo_policy_lock); |
29282381 | 523 | out: |
9e4b50e9 | 524 | tomoyo_put_name(e.pattern); |
b69a54ee KT |
525 | return error; |
526 | } | |
527 | ||
528 | /** | |
529 | * tomoyo_is_no_rewrite_file - Check if the given pathname is not permitted to be rewrited. | |
530 | * | |
531 | * @filename: Filename to check. | |
532 | * | |
533 | * Returns true if @filename is specified by "deny_rewrite" directive, | |
534 | * false otherwise. | |
fdb8ebb7 TH |
535 | * |
536 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
537 | */ |
538 | static bool tomoyo_is_no_rewrite_file(const struct tomoyo_path_info *filename) | |
539 | { | |
540 | struct tomoyo_no_rewrite_entry *ptr; | |
541 | bool found = false; | |
542 | ||
fdb8ebb7 | 543 | list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { |
b69a54ee KT |
544 | if (ptr->is_deleted) |
545 | continue; | |
546 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
547 | continue; | |
548 | found = true; | |
549 | break; | |
550 | } | |
b69a54ee KT |
551 | return found; |
552 | } | |
553 | ||
554 | /** | |
555 | * tomoyo_write_no_rewrite_policy - Write "struct tomoyo_no_rewrite_entry" list. | |
556 | * | |
557 | * @data: String to parse. | |
558 | * @is_delete: True if it is a delete request. | |
559 | * | |
560 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
561 | * |
562 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
563 | */ |
564 | int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete) | |
565 | { | |
566 | return tomoyo_update_no_rewrite_entry(data, is_delete); | |
567 | } | |
568 | ||
569 | /** | |
570 | * tomoyo_read_no_rewrite_policy - Read "struct tomoyo_no_rewrite_entry" list. | |
571 | * | |
572 | * @head: Pointer to "struct tomoyo_io_buffer". | |
573 | * | |
574 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
575 | * |
576 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
577 | */ |
578 | bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head) | |
579 | { | |
580 | struct list_head *pos; | |
581 | bool done = true; | |
582 | ||
b69a54ee KT |
583 | list_for_each_cookie(pos, head->read_var2, &tomoyo_no_rewrite_list) { |
584 | struct tomoyo_no_rewrite_entry *ptr; | |
585 | ptr = list_entry(pos, struct tomoyo_no_rewrite_entry, list); | |
586 | if (ptr->is_deleted) | |
587 | continue; | |
7d2948b1 TH |
588 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_DENY_REWRITE |
589 | "%s\n", ptr->pattern->name); | |
590 | if (!done) | |
b69a54ee | 591 | break; |
b69a54ee | 592 | } |
b69a54ee KT |
593 | return done; |
594 | } | |
595 | ||
596 | /** | |
597 | * tomoyo_update_file_acl - Update file's read/write/execute ACL. | |
598 | * | |
599 | * @filename: Filename. | |
600 | * @perm: Permission (between 1 to 7). | |
601 | * @domain: Pointer to "struct tomoyo_domain_info". | |
602 | * @is_delete: True if it is a delete request. | |
603 | * | |
604 | * Returns 0 on success, negative value otherwise. | |
605 | * | |
606 | * This is legacy support interface for older policy syntax. | |
607 | * Current policy syntax uses "allow_read/write" instead of "6", | |
608 | * "allow_read" instead of "4", "allow_write" instead of "2", | |
609 | * "allow_execute" instead of "1". | |
fdb8ebb7 TH |
610 | * |
611 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
612 | */ |
613 | static int tomoyo_update_file_acl(const char *filename, u8 perm, | |
614 | struct tomoyo_domain_info * const domain, | |
615 | const bool is_delete) | |
616 | { | |
617 | if (perm > 7 || !perm) { | |
618 | printk(KERN_DEBUG "%s: Invalid permission '%d %s'\n", | |
619 | __func__, perm, filename); | |
620 | return -EINVAL; | |
621 | } | |
622 | if (filename[0] != '@' && tomoyo_strendswith(filename, "/")) | |
623 | /* | |
624 | * Only 'allow_mkdir' and 'allow_rmdir' are valid for | |
625 | * directory permissions. | |
626 | */ | |
627 | return 0; | |
628 | if (perm & 4) | |
7ef61233 TH |
629 | tomoyo_update_path_acl(TOMOYO_TYPE_READ, filename, domain, |
630 | is_delete); | |
b69a54ee | 631 | if (perm & 2) |
7ef61233 TH |
632 | tomoyo_update_path_acl(TOMOYO_TYPE_WRITE, filename, domain, |
633 | is_delete); | |
b69a54ee | 634 | if (perm & 1) |
7ef61233 TH |
635 | tomoyo_update_path_acl(TOMOYO_TYPE_EXECUTE, filename, domain, |
636 | is_delete); | |
b69a54ee KT |
637 | return 0; |
638 | } | |
639 | ||
640 | /** | |
7ef61233 | 641 | * tomoyo_path_acl2 - Check permission for single path operation. |
b69a54ee KT |
642 | * |
643 | * @domain: Pointer to "struct tomoyo_domain_info". | |
644 | * @filename: Filename to check. | |
645 | * @perm: Permission. | |
646 | * @may_use_pattern: True if patterned ACL is permitted. | |
647 | * | |
648 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
649 | * |
650 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 651 | */ |
7ef61233 TH |
652 | static int tomoyo_path_acl2(const struct tomoyo_domain_info *domain, |
653 | const struct tomoyo_path_info *filename, | |
654 | const u32 perm, const bool may_use_pattern) | |
b69a54ee KT |
655 | { |
656 | struct tomoyo_acl_info *ptr; | |
657 | int error = -EPERM; | |
658 | ||
fdb8ebb7 | 659 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
660 | struct tomoyo_path_acl *acl; |
661 | if (ptr->type != TOMOYO_TYPE_PATH_ACL) | |
b69a54ee | 662 | continue; |
7ef61233 | 663 | acl = container_of(ptr, struct tomoyo_path_acl, head); |
937bf613 TH |
664 | if (perm <= 0xFFFF) { |
665 | if (!(acl->perm & perm)) | |
666 | continue; | |
667 | } else { | |
668 | if (!(acl->perm_high & (perm >> 16))) | |
669 | continue; | |
670 | } | |
7762fbff TH |
671 | if (!tomoyo_compare_name_union_pattern(filename, &acl->name, |
672 | may_use_pattern)) | |
b69a54ee | 673 | continue; |
b69a54ee KT |
674 | error = 0; |
675 | break; | |
676 | } | |
b69a54ee KT |
677 | return error; |
678 | } | |
679 | ||
680 | /** | |
681 | * tomoyo_check_file_acl - Check permission for opening files. | |
682 | * | |
683 | * @domain: Pointer to "struct tomoyo_domain_info". | |
684 | * @filename: Filename to check. | |
685 | * @operation: Mode ("read" or "write" or "read/write" or "execute"). | |
686 | * | |
687 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
688 | * |
689 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
690 | */ |
691 | static int tomoyo_check_file_acl(const struct tomoyo_domain_info *domain, | |
692 | const struct tomoyo_path_info *filename, | |
693 | const u8 operation) | |
694 | { | |
937bf613 | 695 | u32 perm = 0; |
b69a54ee KT |
696 | |
697 | if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) | |
698 | return 0; | |
699 | if (operation == 6) | |
7ef61233 | 700 | perm = 1 << TOMOYO_TYPE_READ_WRITE; |
b69a54ee | 701 | else if (operation == 4) |
7ef61233 | 702 | perm = 1 << TOMOYO_TYPE_READ; |
b69a54ee | 703 | else if (operation == 2) |
7ef61233 | 704 | perm = 1 << TOMOYO_TYPE_WRITE; |
b69a54ee | 705 | else if (operation == 1) |
7ef61233 | 706 | perm = 1 << TOMOYO_TYPE_EXECUTE; |
b69a54ee KT |
707 | else |
708 | BUG(); | |
7ef61233 | 709 | return tomoyo_path_acl2(domain, filename, perm, operation != 1); |
b69a54ee KT |
710 | } |
711 | ||
712 | /** | |
713 | * tomoyo_check_file_perm2 - Check permission for opening files. | |
714 | * | |
715 | * @domain: Pointer to "struct tomoyo_domain_info". | |
716 | * @filename: Filename to check. | |
717 | * @perm: Mode ("read" or "write" or "read/write" or "execute"). | |
718 | * @operation: Operation name passed used for verbose mode. | |
719 | * @mode: Access control mode. | |
720 | * | |
721 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
722 | * |
723 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
724 | */ |
725 | static int tomoyo_check_file_perm2(struct tomoyo_domain_info * const domain, | |
726 | const struct tomoyo_path_info *filename, | |
727 | const u8 perm, const char *operation, | |
728 | const u8 mode) | |
729 | { | |
730 | const bool is_enforce = (mode == 3); | |
731 | const char *msg = "<unknown>"; | |
732 | int error = 0; | |
733 | ||
734 | if (!filename) | |
735 | return 0; | |
736 | error = tomoyo_check_file_acl(domain, filename, perm); | |
ea13ddba | 737 | if (error && perm == 4 && !domain->ignore_global_allow_read |
b69a54ee KT |
738 | && tomoyo_is_globally_readable_file(filename)) |
739 | error = 0; | |
740 | if (perm == 6) | |
7ef61233 | 741 | msg = tomoyo_path2keyword(TOMOYO_TYPE_READ_WRITE); |
b69a54ee | 742 | else if (perm == 4) |
7ef61233 | 743 | msg = tomoyo_path2keyword(TOMOYO_TYPE_READ); |
b69a54ee | 744 | else if (perm == 2) |
7ef61233 | 745 | msg = tomoyo_path2keyword(TOMOYO_TYPE_WRITE); |
b69a54ee | 746 | else if (perm == 1) |
7ef61233 | 747 | msg = tomoyo_path2keyword(TOMOYO_TYPE_EXECUTE); |
b69a54ee KT |
748 | else |
749 | BUG(); | |
750 | if (!error) | |
751 | return 0; | |
752 | if (tomoyo_verbose_mode(domain)) | |
753 | printk(KERN_WARNING "TOMOYO-%s: Access '%s(%s) %s' denied " | |
754 | "for %s\n", tomoyo_get_msg(is_enforce), msg, operation, | |
755 | filename->name, tomoyo_get_last_name(domain)); | |
756 | if (is_enforce) | |
757 | return error; | |
758 | if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { | |
759 | /* Don't use patterns for execute permission. */ | |
760 | const struct tomoyo_path_info *patterned_file = (perm != 1) ? | |
761 | tomoyo_get_file_pattern(filename) : filename; | |
762 | tomoyo_update_file_acl(patterned_file->name, perm, | |
763 | domain, false); | |
764 | } | |
765 | return 0; | |
766 | } | |
767 | ||
768 | /** | |
769 | * tomoyo_write_file_policy - Update file related list. | |
770 | * | |
771 | * @data: String to parse. | |
772 | * @domain: Pointer to "struct tomoyo_domain_info". | |
773 | * @is_delete: True if it is a delete request. | |
774 | * | |
775 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
776 | * |
777 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
778 | */ |
779 | int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, | |
780 | const bool is_delete) | |
781 | { | |
782 | char *filename = strchr(data, ' '); | |
783 | char *filename2; | |
784 | unsigned int perm; | |
785 | u8 type; | |
786 | ||
787 | if (!filename) | |
788 | return -EINVAL; | |
789 | *filename++ = '\0'; | |
790 | if (sscanf(data, "%u", &perm) == 1) | |
791 | return tomoyo_update_file_acl(filename, (u8) perm, domain, | |
792 | is_delete); | |
793 | if (strncmp(data, "allow_", 6)) | |
794 | goto out; | |
795 | data += 6; | |
7ef61233 TH |
796 | for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) { |
797 | if (strcmp(data, tomoyo_path_keyword[type])) | |
b69a54ee | 798 | continue; |
7ef61233 TH |
799 | return tomoyo_update_path_acl(type, filename, domain, |
800 | is_delete); | |
b69a54ee KT |
801 | } |
802 | filename2 = strchr(filename, ' '); | |
803 | if (!filename2) | |
804 | goto out; | |
805 | *filename2++ = '\0'; | |
7ef61233 TH |
806 | for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) { |
807 | if (strcmp(data, tomoyo_path2_keyword[type])) | |
b69a54ee | 808 | continue; |
7ef61233 TH |
809 | return tomoyo_update_path2_acl(type, filename, filename2, |
810 | domain, is_delete); | |
b69a54ee KT |
811 | } |
812 | out: | |
813 | return -EINVAL; | |
814 | } | |
815 | ||
816 | /** | |
7ef61233 | 817 | * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list. |
b69a54ee KT |
818 | * |
819 | * @type: Type of operation. | |
820 | * @filename: Filename. | |
821 | * @domain: Pointer to "struct tomoyo_domain_info". | |
822 | * @is_delete: True if it is a delete request. | |
823 | * | |
824 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
825 | * |
826 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 827 | */ |
7ef61233 TH |
828 | static int tomoyo_update_path_acl(const u8 type, const char *filename, |
829 | struct tomoyo_domain_info *const domain, | |
830 | const bool is_delete) | |
b69a54ee | 831 | { |
9e4b50e9 | 832 | static const u32 tomoyo_rw_mask = |
7ef61233 | 833 | (1 << TOMOYO_TYPE_READ) | (1 << TOMOYO_TYPE_WRITE); |
9e4b50e9 | 834 | const u32 perm = 1 << type; |
b69a54ee | 835 | struct tomoyo_acl_info *ptr; |
9e4b50e9 TH |
836 | struct tomoyo_path_acl e = { |
837 | .head.type = TOMOYO_TYPE_PATH_ACL, | |
838 | .perm_high = perm >> 16, | |
839 | .perm = perm | |
840 | }; | |
ca0b7df3 | 841 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 842 | |
9e4b50e9 TH |
843 | if (type == TOMOYO_TYPE_READ_WRITE) |
844 | e.perm |= tomoyo_rw_mask; | |
b69a54ee KT |
845 | if (!domain) |
846 | return -EINVAL; | |
7762fbff | 847 | if (!tomoyo_parse_name_union(filename, &e.name)) |
b69a54ee | 848 | return -EINVAL; |
29282381 TH |
849 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
850 | goto out; | |
fdb8ebb7 | 851 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
852 | struct tomoyo_path_acl *acl = |
853 | container_of(ptr, struct tomoyo_path_acl, head); | |
7762fbff | 854 | if (!tomoyo_is_same_path_acl(acl, &e)) |
b69a54ee | 855 | continue; |
ca0b7df3 TH |
856 | if (is_delete) { |
857 | if (perm <= 0xFFFF) | |
858 | acl->perm &= ~perm; | |
859 | else | |
860 | acl->perm_high &= ~(perm >> 16); | |
9e4b50e9 | 861 | if ((acl->perm & tomoyo_rw_mask) != tomoyo_rw_mask) |
7ef61233 TH |
862 | acl->perm &= ~(1 << TOMOYO_TYPE_READ_WRITE); |
863 | else if (!(acl->perm & (1 << TOMOYO_TYPE_READ_WRITE))) | |
9e4b50e9 | 864 | acl->perm &= ~tomoyo_rw_mask; |
ca0b7df3 TH |
865 | } else { |
866 | if (perm <= 0xFFFF) | |
867 | acl->perm |= perm; | |
868 | else | |
869 | acl->perm_high |= (perm >> 16); | |
9e4b50e9 | 870 | if ((acl->perm & tomoyo_rw_mask) == tomoyo_rw_mask) |
7ef61233 TH |
871 | acl->perm |= 1 << TOMOYO_TYPE_READ_WRITE; |
872 | else if (acl->perm & (1 << TOMOYO_TYPE_READ_WRITE)) | |
9e4b50e9 | 873 | acl->perm |= tomoyo_rw_mask; |
ca0b7df3 | 874 | } |
b69a54ee | 875 | error = 0; |
ca0b7df3 | 876 | break; |
cd7bec6a | 877 | } |
9e4b50e9 TH |
878 | if (!is_delete && error) { |
879 | struct tomoyo_path_acl *entry = | |
880 | tomoyo_commit_ok(&e, sizeof(e)); | |
881 | if (entry) { | |
882 | list_add_tail_rcu(&entry->head.list, | |
883 | &domain->acl_info_list); | |
884 | error = 0; | |
885 | } | |
b69a54ee | 886 | } |
f737d95d | 887 | mutex_unlock(&tomoyo_policy_lock); |
29282381 | 888 | out: |
7762fbff | 889 | tomoyo_put_name_union(&e.name); |
b69a54ee KT |
890 | return error; |
891 | } | |
892 | ||
893 | /** | |
7ef61233 | 894 | * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list. |
b69a54ee KT |
895 | * |
896 | * @type: Type of operation. | |
897 | * @filename1: First filename. | |
898 | * @filename2: Second filename. | |
899 | * @domain: Pointer to "struct tomoyo_domain_info". | |
900 | * @is_delete: True if it is a delete request. | |
901 | * | |
902 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
903 | * |
904 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 905 | */ |
7ef61233 TH |
906 | static int tomoyo_update_path2_acl(const u8 type, const char *filename1, |
907 | const char *filename2, | |
908 | struct tomoyo_domain_info *const domain, | |
909 | const bool is_delete) | |
b69a54ee | 910 | { |
9e4b50e9 TH |
911 | const u8 perm = 1 << type; |
912 | struct tomoyo_path2_acl e = { | |
913 | .head.type = TOMOYO_TYPE_PATH2_ACL, | |
914 | .perm = perm | |
915 | }; | |
b69a54ee | 916 | struct tomoyo_acl_info *ptr; |
ca0b7df3 | 917 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee KT |
918 | |
919 | if (!domain) | |
920 | return -EINVAL; | |
7762fbff TH |
921 | if (!tomoyo_parse_name_union(filename1, &e.name1) || |
922 | !tomoyo_parse_name_union(filename2, &e.name2)) | |
ca0b7df3 | 923 | goto out; |
29282381 TH |
924 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
925 | goto out; | |
fdb8ebb7 | 926 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
927 | struct tomoyo_path2_acl *acl = |
928 | container_of(ptr, struct tomoyo_path2_acl, head); | |
7762fbff | 929 | if (!tomoyo_is_same_path2_acl(acl, &e)) |
b69a54ee | 930 | continue; |
ca0b7df3 TH |
931 | if (is_delete) |
932 | acl->perm &= ~perm; | |
933 | else | |
934 | acl->perm |= perm; | |
b69a54ee | 935 | error = 0; |
ca0b7df3 | 936 | break; |
cd7bec6a | 937 | } |
9e4b50e9 TH |
938 | if (!is_delete && error) { |
939 | struct tomoyo_path2_acl *entry = | |
940 | tomoyo_commit_ok(&e, sizeof(e)); | |
941 | if (entry) { | |
942 | list_add_tail_rcu(&entry->head.list, | |
943 | &domain->acl_info_list); | |
944 | error = 0; | |
945 | } | |
b69a54ee | 946 | } |
f737d95d | 947 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 948 | out: |
7762fbff TH |
949 | tomoyo_put_name_union(&e.name1); |
950 | tomoyo_put_name_union(&e.name2); | |
b69a54ee KT |
951 | return error; |
952 | } | |
953 | ||
954 | /** | |
7ef61233 | 955 | * tomoyo_path_acl - Check permission for single path operation. |
b69a54ee KT |
956 | * |
957 | * @domain: Pointer to "struct tomoyo_domain_info". | |
958 | * @type: Type of operation. | |
959 | * @filename: Filename to check. | |
960 | * | |
961 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
962 | * |
963 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 964 | */ |
7ef61233 TH |
965 | static int tomoyo_path_acl(struct tomoyo_domain_info *domain, const u8 type, |
966 | const struct tomoyo_path_info *filename) | |
b69a54ee KT |
967 | { |
968 | if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) | |
969 | return 0; | |
7ef61233 | 970 | return tomoyo_path_acl2(domain, filename, 1 << type, 1); |
b69a54ee KT |
971 | } |
972 | ||
973 | /** | |
7ef61233 | 974 | * tomoyo_path2_acl - Check permission for double path operation. |
b69a54ee KT |
975 | * |
976 | * @domain: Pointer to "struct tomoyo_domain_info". | |
977 | * @type: Type of operation. | |
978 | * @filename1: First filename to check. | |
979 | * @filename2: Second filename to check. | |
980 | * | |
981 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
982 | * |
983 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 984 | */ |
7ef61233 TH |
985 | static int tomoyo_path2_acl(const struct tomoyo_domain_info *domain, |
986 | const u8 type, | |
987 | const struct tomoyo_path_info *filename1, | |
988 | const struct tomoyo_path_info *filename2) | |
b69a54ee KT |
989 | { |
990 | struct tomoyo_acl_info *ptr; | |
991 | const u8 perm = 1 << type; | |
992 | int error = -EPERM; | |
993 | ||
994 | if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) | |
995 | return 0; | |
fdb8ebb7 | 996 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
997 | struct tomoyo_path2_acl *acl; |
998 | if (ptr->type != TOMOYO_TYPE_PATH2_ACL) | |
b69a54ee | 999 | continue; |
7ef61233 | 1000 | acl = container_of(ptr, struct tomoyo_path2_acl, head); |
b69a54ee KT |
1001 | if (!(acl->perm & perm)) |
1002 | continue; | |
7762fbff | 1003 | if (!tomoyo_compare_name_union(filename1, &acl->name1)) |
b69a54ee | 1004 | continue; |
7762fbff | 1005 | if (!tomoyo_compare_name_union(filename2, &acl->name2)) |
b69a54ee KT |
1006 | continue; |
1007 | error = 0; | |
1008 | break; | |
1009 | } | |
b69a54ee KT |
1010 | return error; |
1011 | } | |
1012 | ||
1013 | /** | |
7ef61233 | 1014 | * tomoyo_path_permission2 - Check permission for single path operation. |
b69a54ee KT |
1015 | * |
1016 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1017 | * @operation: Type of operation. | |
1018 | * @filename: Filename to check. | |
1019 | * @mode: Access control mode. | |
1020 | * | |
1021 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1022 | * |
1023 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 1024 | */ |
7ef61233 TH |
1025 | static int tomoyo_path_permission2(struct tomoyo_domain_info *const domain, |
1026 | u8 operation, | |
1027 | const struct tomoyo_path_info *filename, | |
1028 | const u8 mode) | |
b69a54ee KT |
1029 | { |
1030 | const char *msg; | |
1031 | int error; | |
1032 | const bool is_enforce = (mode == 3); | |
1033 | ||
1034 | if (!mode) | |
1035 | return 0; | |
1036 | next: | |
7ef61233 TH |
1037 | error = tomoyo_path_acl(domain, operation, filename); |
1038 | msg = tomoyo_path2keyword(operation); | |
b69a54ee KT |
1039 | if (!error) |
1040 | goto ok; | |
1041 | if (tomoyo_verbose_mode(domain)) | |
1042 | printk(KERN_WARNING "TOMOYO-%s: Access '%s %s' denied for %s\n", | |
1043 | tomoyo_get_msg(is_enforce), msg, filename->name, | |
1044 | tomoyo_get_last_name(domain)); | |
1045 | if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { | |
1046 | const char *name = tomoyo_get_file_pattern(filename)->name; | |
7ef61233 | 1047 | tomoyo_update_path_acl(operation, name, domain, false); |
b69a54ee KT |
1048 | } |
1049 | if (!is_enforce) | |
1050 | error = 0; | |
1051 | ok: | |
1052 | /* | |
1053 | * Since "allow_truncate" doesn't imply "allow_rewrite" permission, | |
1054 | * we need to check "allow_rewrite" permission if the filename is | |
1055 | * specified by "deny_rewrite" keyword. | |
1056 | */ | |
7ef61233 | 1057 | if (!error && operation == TOMOYO_TYPE_TRUNCATE && |
b69a54ee | 1058 | tomoyo_is_no_rewrite_file(filename)) { |
7ef61233 | 1059 | operation = TOMOYO_TYPE_REWRITE; |
b69a54ee KT |
1060 | goto next; |
1061 | } | |
1062 | return error; | |
1063 | } | |
1064 | ||
b69a54ee KT |
1065 | /** |
1066 | * tomoyo_check_exec_perm - Check permission for "execute". | |
1067 | * | |
1068 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1069 | * @filename: Check permission for "execute". | |
b69a54ee KT |
1070 | * |
1071 | * Returns 0 on success, negativevalue otherwise. | |
fdb8ebb7 TH |
1072 | * |
1073 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
1074 | */ |
1075 | int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain, | |
bcb86975 | 1076 | const struct tomoyo_path_info *filename) |
b69a54ee KT |
1077 | { |
1078 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1079 | ||
1080 | if (!mode) | |
1081 | return 0; | |
1082 | return tomoyo_check_file_perm2(domain, filename, 1, "do_execve", mode); | |
1083 | } | |
1084 | ||
1085 | /** | |
1086 | * tomoyo_check_open_permission - Check permission for "read" and "write". | |
1087 | * | |
1088 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1089 | * @path: Pointer to "struct path". | |
1090 | * @flag: Flags for open(). | |
1091 | * | |
1092 | * Returns 0 on success, negative value otherwise. | |
1093 | */ | |
1094 | int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, | |
1095 | struct path *path, const int flag) | |
1096 | { | |
1097 | const u8 acc_mode = ACC_MODE(flag); | |
1098 | int error = -ENOMEM; | |
1099 | struct tomoyo_path_info *buf; | |
1100 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1101 | const bool is_enforce = (mode == 3); | |
fdb8ebb7 | 1102 | int idx; |
b69a54ee KT |
1103 | |
1104 | if (!mode || !path->mnt) | |
1105 | return 0; | |
1106 | if (acc_mode == 0) | |
1107 | return 0; | |
1108 | if (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode)) | |
1109 | /* | |
1110 | * I don't check directories here because mkdir() and rmdir() | |
1111 | * don't call me. | |
1112 | */ | |
1113 | return 0; | |
fdb8ebb7 | 1114 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1115 | buf = tomoyo_get_path(path); |
1116 | if (!buf) | |
1117 | goto out; | |
1118 | error = 0; | |
1119 | /* | |
1120 | * If the filename is specified by "deny_rewrite" keyword, | |
1121 | * we need to check "allow_rewrite" permission when the filename is not | |
1122 | * opened for append mode or the filename is truncated at open time. | |
1123 | */ | |
1124 | if ((acc_mode & MAY_WRITE) && | |
1125 | ((flag & O_TRUNC) || !(flag & O_APPEND)) && | |
1126 | (tomoyo_is_no_rewrite_file(buf))) { | |
7ef61233 TH |
1127 | error = tomoyo_path_permission2(domain, TOMOYO_TYPE_REWRITE, |
1128 | buf, mode); | |
b69a54ee KT |
1129 | } |
1130 | if (!error) | |
1131 | error = tomoyo_check_file_perm2(domain, buf, acc_mode, "open", | |
1132 | mode); | |
1133 | if (!error && (flag & O_TRUNC)) | |
7ef61233 TH |
1134 | error = tomoyo_path_permission2(domain, TOMOYO_TYPE_TRUNCATE, |
1135 | buf, mode); | |
b69a54ee | 1136 | out: |
8e2d39a1 | 1137 | kfree(buf); |
fdb8ebb7 | 1138 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1139 | if (!is_enforce) |
1140 | error = 0; | |
1141 | return error; | |
1142 | } | |
1143 | ||
1144 | /** | |
7ef61233 | 1145 | * tomoyo_path_perm - Check permission for "create", "unlink", "mkdir", "rmdir", "mkfifo", "mksock", "mkblock", "mkchar", "truncate", "symlink", "ioctl", "chmod", "chown", "chgrp", "chroot", "mount" and "unmount". |
b69a54ee | 1146 | * |
b69a54ee KT |
1147 | * @operation: Type of operation. |
1148 | * @path: Pointer to "struct path". | |
1149 | * | |
1150 | * Returns 0 on success, negative value otherwise. | |
1151 | */ | |
97d6931e | 1152 | int tomoyo_path_perm(const u8 operation, struct path *path) |
b69a54ee KT |
1153 | { |
1154 | int error = -ENOMEM; | |
1155 | struct tomoyo_path_info *buf; | |
97d6931e | 1156 | struct tomoyo_domain_info *domain = tomoyo_domain(); |
b69a54ee KT |
1157 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); |
1158 | const bool is_enforce = (mode == 3); | |
fdb8ebb7 | 1159 | int idx; |
b69a54ee KT |
1160 | |
1161 | if (!mode || !path->mnt) | |
1162 | return 0; | |
fdb8ebb7 | 1163 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1164 | buf = tomoyo_get_path(path); |
1165 | if (!buf) | |
1166 | goto out; | |
1167 | switch (operation) { | |
7ef61233 TH |
1168 | case TOMOYO_TYPE_MKDIR: |
1169 | case TOMOYO_TYPE_RMDIR: | |
1170 | case TOMOYO_TYPE_CHROOT: | |
b69a54ee KT |
1171 | if (!buf->is_dir) { |
1172 | /* | |
1173 | * tomoyo_get_path() reserves space for appending "/." | |
1174 | */ | |
1175 | strcat((char *) buf->name, "/"); | |
1176 | tomoyo_fill_path_info(buf); | |
1177 | } | |
1178 | } | |
7ef61233 | 1179 | error = tomoyo_path_permission2(domain, operation, buf, mode); |
b69a54ee | 1180 | out: |
8e2d39a1 | 1181 | kfree(buf); |
fdb8ebb7 | 1182 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1183 | if (!is_enforce) |
1184 | error = 0; | |
1185 | return error; | |
1186 | } | |
1187 | ||
1188 | /** | |
1189 | * tomoyo_check_rewrite_permission - Check permission for "rewrite". | |
1190 | * | |
b69a54ee KT |
1191 | * @filp: Pointer to "struct file". |
1192 | * | |
1193 | * Returns 0 on success, negative value otherwise. | |
1194 | */ | |
97d6931e | 1195 | int tomoyo_check_rewrite_permission(struct file *filp) |
b69a54ee KT |
1196 | { |
1197 | int error = -ENOMEM; | |
97d6931e | 1198 | struct tomoyo_domain_info *domain = tomoyo_domain(); |
b69a54ee KT |
1199 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); |
1200 | const bool is_enforce = (mode == 3); | |
1201 | struct tomoyo_path_info *buf; | |
fdb8ebb7 | 1202 | int idx; |
b69a54ee KT |
1203 | |
1204 | if (!mode || !filp->f_path.mnt) | |
1205 | return 0; | |
fdb8ebb7 TH |
1206 | |
1207 | idx = tomoyo_read_lock(); | |
b69a54ee KT |
1208 | buf = tomoyo_get_path(&filp->f_path); |
1209 | if (!buf) | |
1210 | goto out; | |
1211 | if (!tomoyo_is_no_rewrite_file(buf)) { | |
1212 | error = 0; | |
1213 | goto out; | |
1214 | } | |
7ef61233 | 1215 | error = tomoyo_path_permission2(domain, TOMOYO_TYPE_REWRITE, buf, mode); |
b69a54ee | 1216 | out: |
8e2d39a1 | 1217 | kfree(buf); |
fdb8ebb7 | 1218 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1219 | if (!is_enforce) |
1220 | error = 0; | |
1221 | return error; | |
1222 | } | |
1223 | ||
1224 | /** | |
7ef61233 | 1225 | * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root". |
b69a54ee | 1226 | * |
b69a54ee KT |
1227 | * @operation: Type of operation. |
1228 | * @path1: Pointer to "struct path". | |
1229 | * @path2: Pointer to "struct path". | |
1230 | * | |
1231 | * Returns 0 on success, negative value otherwise. | |
1232 | */ | |
97d6931e | 1233 | int tomoyo_path2_perm(const u8 operation, struct path *path1, |
7ef61233 | 1234 | struct path *path2) |
b69a54ee KT |
1235 | { |
1236 | int error = -ENOMEM; | |
1237 | struct tomoyo_path_info *buf1, *buf2; | |
97d6931e | 1238 | struct tomoyo_domain_info *domain = tomoyo_domain(); |
b69a54ee KT |
1239 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); |
1240 | const bool is_enforce = (mode == 3); | |
1241 | const char *msg; | |
fdb8ebb7 | 1242 | int idx; |
b69a54ee KT |
1243 | |
1244 | if (!mode || !path1->mnt || !path2->mnt) | |
1245 | return 0; | |
fdb8ebb7 | 1246 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1247 | buf1 = tomoyo_get_path(path1); |
1248 | buf2 = tomoyo_get_path(path2); | |
1249 | if (!buf1 || !buf2) | |
1250 | goto out; | |
1251 | { | |
1252 | struct dentry *dentry = path1->dentry; | |
1253 | if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) { | |
1254 | /* | |
1255 | * tomoyo_get_path() reserves space for appending "/." | |
1256 | */ | |
1257 | if (!buf1->is_dir) { | |
1258 | strcat((char *) buf1->name, "/"); | |
1259 | tomoyo_fill_path_info(buf1); | |
1260 | } | |
1261 | if (!buf2->is_dir) { | |
1262 | strcat((char *) buf2->name, "/"); | |
1263 | tomoyo_fill_path_info(buf2); | |
1264 | } | |
1265 | } | |
1266 | } | |
7ef61233 TH |
1267 | error = tomoyo_path2_acl(domain, operation, buf1, buf2); |
1268 | msg = tomoyo_path22keyword(operation); | |
b69a54ee KT |
1269 | if (!error) |
1270 | goto out; | |
1271 | if (tomoyo_verbose_mode(domain)) | |
1272 | printk(KERN_WARNING "TOMOYO-%s: Access '%s %s %s' " | |
1273 | "denied for %s\n", tomoyo_get_msg(is_enforce), | |
1274 | msg, buf1->name, buf2->name, | |
1275 | tomoyo_get_last_name(domain)); | |
1276 | if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { | |
1277 | const char *name1 = tomoyo_get_file_pattern(buf1)->name; | |
1278 | const char *name2 = tomoyo_get_file_pattern(buf2)->name; | |
7ef61233 TH |
1279 | tomoyo_update_path2_acl(operation, name1, name2, domain, |
1280 | false); | |
b69a54ee KT |
1281 | } |
1282 | out: | |
8e2d39a1 TH |
1283 | kfree(buf1); |
1284 | kfree(buf2); | |
fdb8ebb7 | 1285 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1286 | if (!is_enforce) |
1287 | error = 0; | |
1288 | return error; | |
1289 | } |