Commit | Line | Data |
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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" | |
13 | #include "tomoyo.h" | |
14 | #include "realpath.h" | |
15 | #define ACC_MODE(x) ("\000\004\002\006"[(x)&O_ACCMODE]) | |
16 | ||
c3fa109a TH |
17 | /* |
18 | * tomoyo_globally_readable_file_entry is a structure which is used for holding | |
19 | * "allow_read" entries. | |
20 | * It has following fields. | |
21 | * | |
22 | * (1) "list" which is linked to tomoyo_globally_readable_list . | |
23 | * (2) "filename" is a pathname which is allowed to open(O_RDONLY). | |
24 | * (3) "is_deleted" is a bool which is true if marked as deleted, false | |
25 | * otherwise. | |
26 | */ | |
b69a54ee KT |
27 | struct tomoyo_globally_readable_file_entry { |
28 | struct list_head list; | |
29 | const struct tomoyo_path_info *filename; | |
30 | bool is_deleted; | |
31 | }; | |
32 | ||
c3fa109a TH |
33 | /* |
34 | * tomoyo_pattern_entry is a structure which is used for holding | |
35 | * "tomoyo_pattern_list" entries. | |
36 | * It has following fields. | |
37 | * | |
38 | * (1) "list" which is linked to tomoyo_pattern_list . | |
39 | * (2) "pattern" is a pathname pattern which is used for converting pathnames | |
40 | * to pathname patterns during learning mode. | |
41 | * (3) "is_deleted" is a bool which is true if marked as deleted, false | |
42 | * otherwise. | |
43 | */ | |
b69a54ee KT |
44 | struct tomoyo_pattern_entry { |
45 | struct list_head list; | |
46 | const struct tomoyo_path_info *pattern; | |
47 | bool is_deleted; | |
48 | }; | |
49 | ||
c3fa109a TH |
50 | /* |
51 | * tomoyo_no_rewrite_entry is a structure which is used for holding | |
52 | * "deny_rewrite" entries. | |
53 | * It has following fields. | |
54 | * | |
55 | * (1) "list" which is linked to tomoyo_no_rewrite_list . | |
56 | * (2) "pattern" is a pathname which is by default not permitted to modify | |
57 | * already existing content. | |
58 | * (3) "is_deleted" is a bool which is true if marked as deleted, false | |
59 | * otherwise. | |
60 | */ | |
b69a54ee KT |
61 | struct tomoyo_no_rewrite_entry { |
62 | struct list_head list; | |
63 | const struct tomoyo_path_info *pattern; | |
64 | bool is_deleted; | |
65 | }; | |
66 | ||
67 | /* Keyword array for single path operations. */ | |
68 | static const char *tomoyo_sp_keyword[TOMOYO_MAX_SINGLE_PATH_OPERATION] = { | |
69 | [TOMOYO_TYPE_READ_WRITE_ACL] = "read/write", | |
70 | [TOMOYO_TYPE_EXECUTE_ACL] = "execute", | |
71 | [TOMOYO_TYPE_READ_ACL] = "read", | |
72 | [TOMOYO_TYPE_WRITE_ACL] = "write", | |
73 | [TOMOYO_TYPE_CREATE_ACL] = "create", | |
74 | [TOMOYO_TYPE_UNLINK_ACL] = "unlink", | |
75 | [TOMOYO_TYPE_MKDIR_ACL] = "mkdir", | |
76 | [TOMOYO_TYPE_RMDIR_ACL] = "rmdir", | |
77 | [TOMOYO_TYPE_MKFIFO_ACL] = "mkfifo", | |
78 | [TOMOYO_TYPE_MKSOCK_ACL] = "mksock", | |
79 | [TOMOYO_TYPE_MKBLOCK_ACL] = "mkblock", | |
80 | [TOMOYO_TYPE_MKCHAR_ACL] = "mkchar", | |
81 | [TOMOYO_TYPE_TRUNCATE_ACL] = "truncate", | |
82 | [TOMOYO_TYPE_SYMLINK_ACL] = "symlink", | |
83 | [TOMOYO_TYPE_REWRITE_ACL] = "rewrite", | |
937bf613 TH |
84 | [TOMOYO_TYPE_IOCTL_ACL] = "ioctl", |
85 | [TOMOYO_TYPE_CHMOD_ACL] = "chmod", | |
86 | [TOMOYO_TYPE_CHOWN_ACL] = "chown", | |
87 | [TOMOYO_TYPE_CHGRP_ACL] = "chgrp", | |
88 | [TOMOYO_TYPE_CHROOT_ACL] = "chroot", | |
89 | [TOMOYO_TYPE_MOUNT_ACL] = "mount", | |
90 | [TOMOYO_TYPE_UMOUNT_ACL] = "unmount", | |
b69a54ee KT |
91 | }; |
92 | ||
93 | /* Keyword array for double path operations. */ | |
94 | static const char *tomoyo_dp_keyword[TOMOYO_MAX_DOUBLE_PATH_OPERATION] = { | |
95 | [TOMOYO_TYPE_LINK_ACL] = "link", | |
96 | [TOMOYO_TYPE_RENAME_ACL] = "rename", | |
937bf613 | 97 | [TOMOYO_TYPE_PIVOT_ROOT_ACL] = "pivot_root", |
b69a54ee KT |
98 | }; |
99 | ||
100 | /** | |
101 | * tomoyo_sp2keyword - Get the name of single path operation. | |
102 | * | |
103 | * @operation: Type of operation. | |
104 | * | |
105 | * Returns the name of single path operation. | |
106 | */ | |
107 | const char *tomoyo_sp2keyword(const u8 operation) | |
108 | { | |
109 | return (operation < TOMOYO_MAX_SINGLE_PATH_OPERATION) | |
110 | ? tomoyo_sp_keyword[operation] : NULL; | |
111 | } | |
112 | ||
113 | /** | |
114 | * tomoyo_dp2keyword - Get the name of double path operation. | |
115 | * | |
116 | * @operation: Type of operation. | |
117 | * | |
118 | * Returns the name of double path operation. | |
119 | */ | |
120 | const char *tomoyo_dp2keyword(const u8 operation) | |
121 | { | |
122 | return (operation < TOMOYO_MAX_DOUBLE_PATH_OPERATION) | |
123 | ? tomoyo_dp_keyword[operation] : NULL; | |
124 | } | |
125 | ||
126 | /** | |
127 | * tomoyo_strendswith - Check whether the token ends with the given token. | |
128 | * | |
129 | * @name: The token to check. | |
130 | * @tail: The token to find. | |
131 | * | |
132 | * Returns true if @name ends with @tail, false otherwise. | |
133 | */ | |
134 | static bool tomoyo_strendswith(const char *name, const char *tail) | |
135 | { | |
136 | int len; | |
137 | ||
138 | if (!name || !tail) | |
139 | return false; | |
140 | len = strlen(name) - strlen(tail); | |
141 | return len >= 0 && !strcmp(name + len, tail); | |
142 | } | |
143 | ||
144 | /** | |
145 | * tomoyo_get_path - Get realpath. | |
146 | * | |
147 | * @path: Pointer to "struct path". | |
148 | * | |
149 | * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise. | |
150 | */ | |
151 | static struct tomoyo_path_info *tomoyo_get_path(struct path *path) | |
152 | { | |
153 | int error; | |
154 | struct tomoyo_path_info_with_data *buf = tomoyo_alloc(sizeof(*buf)); | |
155 | ||
156 | if (!buf) | |
157 | return NULL; | |
158 | /* Reserve one byte for appending "/". */ | |
159 | error = tomoyo_realpath_from_path2(path, buf->body, | |
160 | sizeof(buf->body) - 2); | |
161 | if (!error) { | |
162 | buf->head.name = buf->body; | |
163 | tomoyo_fill_path_info(&buf->head); | |
164 | return &buf->head; | |
165 | } | |
166 | tomoyo_free(buf); | |
167 | return NULL; | |
168 | } | |
169 | ||
170 | /* Lock for domain->acl_info_list. */ | |
171 | DECLARE_RWSEM(tomoyo_domain_acl_info_list_lock); | |
172 | ||
173 | static int tomoyo_update_double_path_acl(const u8 type, const char *filename1, | |
174 | const char *filename2, | |
175 | struct tomoyo_domain_info * | |
176 | const domain, const bool is_delete); | |
177 | static int tomoyo_update_single_path_acl(const u8 type, const char *filename, | |
178 | struct tomoyo_domain_info * | |
179 | const domain, const bool is_delete); | |
180 | ||
c3fa109a TH |
181 | /* |
182 | * tomoyo_globally_readable_list is used for holding list of pathnames which | |
183 | * are by default allowed to be open()ed for reading by any process. | |
184 | * | |
185 | * An entry is added by | |
186 | * | |
187 | * # echo 'allow_read /lib/libc-2.5.so' > \ | |
188 | * /sys/kernel/security/tomoyo/exception_policy | |
189 | * | |
190 | * and is deleted by | |
191 | * | |
192 | * # echo 'delete allow_read /lib/libc-2.5.so' > \ | |
193 | * /sys/kernel/security/tomoyo/exception_policy | |
194 | * | |
195 | * and all entries are retrieved by | |
196 | * | |
197 | * # grep ^allow_read /sys/kernel/security/tomoyo/exception_policy | |
198 | * | |
199 | * In the example above, any process is allowed to | |
200 | * open("/lib/libc-2.5.so", O_RDONLY). | |
201 | * One exception is, if the domain which current process belongs to is marked | |
202 | * as "ignore_global_allow_read", current process can't do so unless explicitly | |
203 | * given "allow_read /lib/libc-2.5.so" to the domain which current process | |
204 | * belongs to. | |
205 | */ | |
b69a54ee KT |
206 | static LIST_HEAD(tomoyo_globally_readable_list); |
207 | static DECLARE_RWSEM(tomoyo_globally_readable_list_lock); | |
208 | ||
209 | /** | |
210 | * tomoyo_update_globally_readable_entry - Update "struct tomoyo_globally_readable_file_entry" list. | |
211 | * | |
212 | * @filename: Filename unconditionally permitted to open() for reading. | |
213 | * @is_delete: True if it is a delete request. | |
214 | * | |
215 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
216 | * |
217 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
218 | */ |
219 | static int tomoyo_update_globally_readable_entry(const char *filename, | |
220 | const bool is_delete) | |
221 | { | |
222 | struct tomoyo_globally_readable_file_entry *new_entry; | |
223 | struct tomoyo_globally_readable_file_entry *ptr; | |
224 | const struct tomoyo_path_info *saved_filename; | |
225 | int error = -ENOMEM; | |
226 | ||
227 | if (!tomoyo_is_correct_path(filename, 1, 0, -1, __func__)) | |
228 | return -EINVAL; | |
229 | saved_filename = tomoyo_save_name(filename); | |
230 | if (!saved_filename) | |
231 | return -ENOMEM; | |
b69a54ee | 232 | down_write(&tomoyo_globally_readable_list_lock); |
fdb8ebb7 | 233 | list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { |
b69a54ee KT |
234 | if (ptr->filename != saved_filename) |
235 | continue; | |
236 | ptr->is_deleted = is_delete; | |
237 | error = 0; | |
238 | goto out; | |
239 | } | |
240 | if (is_delete) { | |
241 | error = -ENOENT; | |
242 | goto out; | |
243 | } | |
244 | new_entry = tomoyo_alloc_element(sizeof(*new_entry)); | |
245 | if (!new_entry) | |
246 | goto out; | |
247 | new_entry->filename = saved_filename; | |
fdb8ebb7 | 248 | list_add_tail_rcu(&new_entry->list, &tomoyo_globally_readable_list); |
b69a54ee KT |
249 | error = 0; |
250 | out: | |
251 | up_write(&tomoyo_globally_readable_list_lock); | |
b69a54ee KT |
252 | return error; |
253 | } | |
254 | ||
255 | /** | |
256 | * tomoyo_is_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading. | |
257 | * | |
258 | * @filename: The filename to check. | |
259 | * | |
260 | * Returns true if any domain can open @filename for reading, false otherwise. | |
fdb8ebb7 TH |
261 | * |
262 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
263 | */ |
264 | static bool tomoyo_is_globally_readable_file(const struct tomoyo_path_info * | |
265 | filename) | |
266 | { | |
267 | struct tomoyo_globally_readable_file_entry *ptr; | |
268 | bool found = false; | |
fdb8ebb7 TH |
269 | |
270 | list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { | |
b69a54ee KT |
271 | if (!ptr->is_deleted && |
272 | tomoyo_path_matches_pattern(filename, ptr->filename)) { | |
273 | found = true; | |
274 | break; | |
275 | } | |
276 | } | |
b69a54ee KT |
277 | return found; |
278 | } | |
279 | ||
280 | /** | |
281 | * tomoyo_write_globally_readable_policy - Write "struct tomoyo_globally_readable_file_entry" list. | |
282 | * | |
283 | * @data: String to parse. | |
284 | * @is_delete: True if it is a delete request. | |
285 | * | |
286 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
287 | * |
288 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
289 | */ |
290 | int tomoyo_write_globally_readable_policy(char *data, const bool is_delete) | |
291 | { | |
292 | return tomoyo_update_globally_readable_entry(data, is_delete); | |
293 | } | |
294 | ||
295 | /** | |
296 | * tomoyo_read_globally_readable_policy - Read "struct tomoyo_globally_readable_file_entry" list. | |
297 | * | |
298 | * @head: Pointer to "struct tomoyo_io_buffer". | |
299 | * | |
300 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
301 | * |
302 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
303 | */ |
304 | bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head) | |
305 | { | |
306 | struct list_head *pos; | |
307 | bool done = true; | |
308 | ||
b69a54ee KT |
309 | list_for_each_cookie(pos, head->read_var2, |
310 | &tomoyo_globally_readable_list) { | |
311 | struct tomoyo_globally_readable_file_entry *ptr; | |
312 | ptr = list_entry(pos, | |
313 | struct tomoyo_globally_readable_file_entry, | |
314 | list); | |
315 | if (ptr->is_deleted) | |
316 | continue; | |
7d2948b1 TH |
317 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_READ "%s\n", |
318 | ptr->filename->name); | |
319 | if (!done) | |
b69a54ee | 320 | break; |
b69a54ee | 321 | } |
b69a54ee KT |
322 | return done; |
323 | } | |
324 | ||
c3fa109a TH |
325 | /* tomoyo_pattern_list is used for holding list of pathnames which are used for |
326 | * converting pathnames to pathname patterns during learning mode. | |
327 | * | |
328 | * An entry is added by | |
329 | * | |
330 | * # echo 'file_pattern /proc/\$/mounts' > \ | |
331 | * /sys/kernel/security/tomoyo/exception_policy | |
332 | * | |
333 | * and is deleted by | |
334 | * | |
335 | * # echo 'delete file_pattern /proc/\$/mounts' > \ | |
336 | * /sys/kernel/security/tomoyo/exception_policy | |
337 | * | |
338 | * and all entries are retrieved by | |
339 | * | |
340 | * # grep ^file_pattern /sys/kernel/security/tomoyo/exception_policy | |
341 | * | |
342 | * In the example above, if a process which belongs to a domain which is in | |
343 | * learning mode requested open("/proc/1/mounts", O_RDONLY), | |
344 | * "allow_read /proc/\$/mounts" is automatically added to the domain which that | |
345 | * process belongs to. | |
346 | * | |
347 | * It is not a desirable behavior that we have to use /proc/\$/ instead of | |
348 | * /proc/self/ when current process needs to access only current process's | |
349 | * information. As of now, LSM version of TOMOYO is using __d_path() for | |
350 | * calculating pathname. Non LSM version of TOMOYO is using its own function | |
351 | * which pretends as if /proc/self/ is not a symlink; so that we can forbid | |
352 | * current process from accessing other process's information. | |
353 | */ | |
b69a54ee KT |
354 | static LIST_HEAD(tomoyo_pattern_list); |
355 | static DECLARE_RWSEM(tomoyo_pattern_list_lock); | |
356 | ||
357 | /** | |
358 | * tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list. | |
359 | * | |
360 | * @pattern: Pathname pattern. | |
361 | * @is_delete: True if it is a delete request. | |
362 | * | |
363 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
364 | * |
365 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
366 | */ |
367 | static int tomoyo_update_file_pattern_entry(const char *pattern, | |
368 | const bool is_delete) | |
369 | { | |
370 | struct tomoyo_pattern_entry *new_entry; | |
371 | struct tomoyo_pattern_entry *ptr; | |
372 | const struct tomoyo_path_info *saved_pattern; | |
373 | int error = -ENOMEM; | |
374 | ||
375 | if (!tomoyo_is_correct_path(pattern, 0, 1, 0, __func__)) | |
376 | return -EINVAL; | |
377 | saved_pattern = tomoyo_save_name(pattern); | |
378 | if (!saved_pattern) | |
379 | return -ENOMEM; | |
b69a54ee | 380 | down_write(&tomoyo_pattern_list_lock); |
fdb8ebb7 | 381 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { |
b69a54ee KT |
382 | if (saved_pattern != ptr->pattern) |
383 | continue; | |
384 | ptr->is_deleted = is_delete; | |
385 | error = 0; | |
386 | goto out; | |
387 | } | |
388 | if (is_delete) { | |
389 | error = -ENOENT; | |
390 | goto out; | |
391 | } | |
392 | new_entry = tomoyo_alloc_element(sizeof(*new_entry)); | |
393 | if (!new_entry) | |
394 | goto out; | |
395 | new_entry->pattern = saved_pattern; | |
fdb8ebb7 | 396 | list_add_tail_rcu(&new_entry->list, &tomoyo_pattern_list); |
b69a54ee KT |
397 | error = 0; |
398 | out: | |
399 | up_write(&tomoyo_pattern_list_lock); | |
b69a54ee KT |
400 | return error; |
401 | } | |
402 | ||
403 | /** | |
404 | * tomoyo_get_file_pattern - Get patterned pathname. | |
405 | * | |
406 | * @filename: The filename to find patterned pathname. | |
407 | * | |
408 | * Returns pointer to pathname pattern if matched, @filename otherwise. | |
fdb8ebb7 TH |
409 | * |
410 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
411 | */ |
412 | static const struct tomoyo_path_info * | |
413 | tomoyo_get_file_pattern(const struct tomoyo_path_info *filename) | |
414 | { | |
415 | struct tomoyo_pattern_entry *ptr; | |
416 | const struct tomoyo_path_info *pattern = NULL; | |
417 | ||
fdb8ebb7 | 418 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { |
b69a54ee KT |
419 | if (ptr->is_deleted) |
420 | continue; | |
421 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
422 | continue; | |
423 | pattern = ptr->pattern; | |
424 | if (tomoyo_strendswith(pattern->name, "/\\*")) { | |
425 | /* Do nothing. Try to find the better match. */ | |
426 | } else { | |
427 | /* This would be the better match. Use this. */ | |
428 | break; | |
429 | } | |
430 | } | |
b69a54ee KT |
431 | if (pattern) |
432 | filename = pattern; | |
433 | return filename; | |
434 | } | |
435 | ||
436 | /** | |
437 | * tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list. | |
438 | * | |
439 | * @data: String to parse. | |
440 | * @is_delete: True if it is a delete request. | |
441 | * | |
442 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
443 | * |
444 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
445 | */ |
446 | int tomoyo_write_pattern_policy(char *data, const bool is_delete) | |
447 | { | |
448 | return tomoyo_update_file_pattern_entry(data, is_delete); | |
449 | } | |
450 | ||
451 | /** | |
452 | * tomoyo_read_file_pattern - Read "struct tomoyo_pattern_entry" list. | |
453 | * | |
454 | * @head: Pointer to "struct tomoyo_io_buffer". | |
455 | * | |
456 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
457 | * |
458 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
459 | */ |
460 | bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head) | |
461 | { | |
462 | struct list_head *pos; | |
463 | bool done = true; | |
464 | ||
b69a54ee KT |
465 | list_for_each_cookie(pos, head->read_var2, &tomoyo_pattern_list) { |
466 | struct tomoyo_pattern_entry *ptr; | |
467 | ptr = list_entry(pos, struct tomoyo_pattern_entry, list); | |
468 | if (ptr->is_deleted) | |
469 | continue; | |
7d2948b1 TH |
470 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_FILE_PATTERN |
471 | "%s\n", ptr->pattern->name); | |
472 | if (!done) | |
b69a54ee | 473 | break; |
b69a54ee | 474 | } |
b69a54ee KT |
475 | return done; |
476 | } | |
477 | ||
c3fa109a TH |
478 | /* |
479 | * tomoyo_no_rewrite_list is used for holding list of pathnames which are by | |
480 | * default forbidden to modify already written content of a file. | |
481 | * | |
482 | * An entry is added by | |
483 | * | |
484 | * # echo 'deny_rewrite /var/log/messages' > \ | |
485 | * /sys/kernel/security/tomoyo/exception_policy | |
486 | * | |
487 | * and is deleted by | |
488 | * | |
489 | * # echo 'delete deny_rewrite /var/log/messages' > \ | |
490 | * /sys/kernel/security/tomoyo/exception_policy | |
491 | * | |
492 | * and all entries are retrieved by | |
493 | * | |
494 | * # grep ^deny_rewrite /sys/kernel/security/tomoyo/exception_policy | |
495 | * | |
496 | * In the example above, if a process requested to rewrite /var/log/messages , | |
497 | * the process can't rewrite unless the domain which that process belongs to | |
498 | * has "allow_rewrite /var/log/messages" entry. | |
499 | * | |
500 | * It is not a desirable behavior that we have to add "\040(deleted)" suffix | |
501 | * when we want to allow rewriting already unlink()ed file. As of now, | |
502 | * LSM version of TOMOYO is using __d_path() for calculating pathname. | |
503 | * Non LSM version of TOMOYO is using its own function which doesn't append | |
504 | * " (deleted)" suffix if the file is already unlink()ed; so that we don't | |
505 | * need to worry whether the file is already unlink()ed or not. | |
506 | */ | |
b69a54ee KT |
507 | static LIST_HEAD(tomoyo_no_rewrite_list); |
508 | static DECLARE_RWSEM(tomoyo_no_rewrite_list_lock); | |
509 | ||
510 | /** | |
511 | * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list. | |
512 | * | |
513 | * @pattern: Pathname pattern that are not rewritable by default. | |
514 | * @is_delete: True if it is a delete request. | |
515 | * | |
516 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
517 | * |
518 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
519 | */ |
520 | static int tomoyo_update_no_rewrite_entry(const char *pattern, | |
521 | const bool is_delete) | |
522 | { | |
523 | struct tomoyo_no_rewrite_entry *new_entry, *ptr; | |
524 | const struct tomoyo_path_info *saved_pattern; | |
525 | int error = -ENOMEM; | |
526 | ||
527 | if (!tomoyo_is_correct_path(pattern, 0, 0, 0, __func__)) | |
528 | return -EINVAL; | |
529 | saved_pattern = tomoyo_save_name(pattern); | |
530 | if (!saved_pattern) | |
531 | return -ENOMEM; | |
b69a54ee | 532 | down_write(&tomoyo_no_rewrite_list_lock); |
fdb8ebb7 | 533 | list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { |
b69a54ee KT |
534 | if (ptr->pattern != saved_pattern) |
535 | continue; | |
536 | ptr->is_deleted = is_delete; | |
537 | error = 0; | |
538 | goto out; | |
539 | } | |
540 | if (is_delete) { | |
541 | error = -ENOENT; | |
542 | goto out; | |
543 | } | |
544 | new_entry = tomoyo_alloc_element(sizeof(*new_entry)); | |
545 | if (!new_entry) | |
546 | goto out; | |
547 | new_entry->pattern = saved_pattern; | |
fdb8ebb7 | 548 | list_add_tail_rcu(&new_entry->list, &tomoyo_no_rewrite_list); |
b69a54ee KT |
549 | error = 0; |
550 | out: | |
551 | up_write(&tomoyo_no_rewrite_list_lock); | |
b69a54ee KT |
552 | return error; |
553 | } | |
554 | ||
555 | /** | |
556 | * tomoyo_is_no_rewrite_file - Check if the given pathname is not permitted to be rewrited. | |
557 | * | |
558 | * @filename: Filename to check. | |
559 | * | |
560 | * Returns true if @filename is specified by "deny_rewrite" directive, | |
561 | * false otherwise. | |
fdb8ebb7 TH |
562 | * |
563 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
564 | */ |
565 | static bool tomoyo_is_no_rewrite_file(const struct tomoyo_path_info *filename) | |
566 | { | |
567 | struct tomoyo_no_rewrite_entry *ptr; | |
568 | bool found = false; | |
569 | ||
fdb8ebb7 | 570 | list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { |
b69a54ee KT |
571 | if (ptr->is_deleted) |
572 | continue; | |
573 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
574 | continue; | |
575 | found = true; | |
576 | break; | |
577 | } | |
b69a54ee KT |
578 | return found; |
579 | } | |
580 | ||
581 | /** | |
582 | * tomoyo_write_no_rewrite_policy - Write "struct tomoyo_no_rewrite_entry" list. | |
583 | * | |
584 | * @data: String to parse. | |
585 | * @is_delete: True if it is a delete request. | |
586 | * | |
587 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
588 | * |
589 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
590 | */ |
591 | int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete) | |
592 | { | |
593 | return tomoyo_update_no_rewrite_entry(data, is_delete); | |
594 | } | |
595 | ||
596 | /** | |
597 | * tomoyo_read_no_rewrite_policy - Read "struct tomoyo_no_rewrite_entry" list. | |
598 | * | |
599 | * @head: Pointer to "struct tomoyo_io_buffer". | |
600 | * | |
601 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
602 | * |
603 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
604 | */ |
605 | bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head) | |
606 | { | |
607 | struct list_head *pos; | |
608 | bool done = true; | |
609 | ||
b69a54ee KT |
610 | list_for_each_cookie(pos, head->read_var2, &tomoyo_no_rewrite_list) { |
611 | struct tomoyo_no_rewrite_entry *ptr; | |
612 | ptr = list_entry(pos, struct tomoyo_no_rewrite_entry, list); | |
613 | if (ptr->is_deleted) | |
614 | continue; | |
7d2948b1 TH |
615 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_DENY_REWRITE |
616 | "%s\n", ptr->pattern->name); | |
617 | if (!done) | |
b69a54ee | 618 | break; |
b69a54ee | 619 | } |
b69a54ee KT |
620 | return done; |
621 | } | |
622 | ||
623 | /** | |
624 | * tomoyo_update_file_acl - Update file's read/write/execute ACL. | |
625 | * | |
626 | * @filename: Filename. | |
627 | * @perm: Permission (between 1 to 7). | |
628 | * @domain: Pointer to "struct tomoyo_domain_info". | |
629 | * @is_delete: True if it is a delete request. | |
630 | * | |
631 | * Returns 0 on success, negative value otherwise. | |
632 | * | |
633 | * This is legacy support interface for older policy syntax. | |
634 | * Current policy syntax uses "allow_read/write" instead of "6", | |
635 | * "allow_read" instead of "4", "allow_write" instead of "2", | |
636 | * "allow_execute" instead of "1". | |
fdb8ebb7 TH |
637 | * |
638 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
639 | */ |
640 | static int tomoyo_update_file_acl(const char *filename, u8 perm, | |
641 | struct tomoyo_domain_info * const domain, | |
642 | const bool is_delete) | |
643 | { | |
644 | if (perm > 7 || !perm) { | |
645 | printk(KERN_DEBUG "%s: Invalid permission '%d %s'\n", | |
646 | __func__, perm, filename); | |
647 | return -EINVAL; | |
648 | } | |
649 | if (filename[0] != '@' && tomoyo_strendswith(filename, "/")) | |
650 | /* | |
651 | * Only 'allow_mkdir' and 'allow_rmdir' are valid for | |
652 | * directory permissions. | |
653 | */ | |
654 | return 0; | |
655 | if (perm & 4) | |
656 | tomoyo_update_single_path_acl(TOMOYO_TYPE_READ_ACL, filename, | |
657 | domain, is_delete); | |
658 | if (perm & 2) | |
659 | tomoyo_update_single_path_acl(TOMOYO_TYPE_WRITE_ACL, filename, | |
660 | domain, is_delete); | |
661 | if (perm & 1) | |
662 | tomoyo_update_single_path_acl(TOMOYO_TYPE_EXECUTE_ACL, | |
663 | filename, domain, is_delete); | |
664 | return 0; | |
665 | } | |
666 | ||
667 | /** | |
668 | * tomoyo_check_single_path_acl2 - Check permission for single path operation. | |
669 | * | |
670 | * @domain: Pointer to "struct tomoyo_domain_info". | |
671 | * @filename: Filename to check. | |
672 | * @perm: Permission. | |
673 | * @may_use_pattern: True if patterned ACL is permitted. | |
674 | * | |
675 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
676 | * |
677 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
678 | */ |
679 | static int tomoyo_check_single_path_acl2(const struct tomoyo_domain_info * | |
680 | domain, | |
681 | const struct tomoyo_path_info * | |
682 | filename, | |
937bf613 | 683 | const u32 perm, |
b69a54ee KT |
684 | const bool may_use_pattern) |
685 | { | |
686 | struct tomoyo_acl_info *ptr; | |
687 | int error = -EPERM; | |
688 | ||
fdb8ebb7 | 689 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
b69a54ee KT |
690 | struct tomoyo_single_path_acl_record *acl; |
691 | if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_SINGLE_PATH_ACL) | |
692 | continue; | |
693 | acl = container_of(ptr, struct tomoyo_single_path_acl_record, | |
694 | head); | |
937bf613 TH |
695 | if (perm <= 0xFFFF) { |
696 | if (!(acl->perm & perm)) | |
697 | continue; | |
698 | } else { | |
699 | if (!(acl->perm_high & (perm >> 16))) | |
700 | continue; | |
701 | } | |
b69a54ee KT |
702 | if (may_use_pattern || !acl->filename->is_patterned) { |
703 | if (!tomoyo_path_matches_pattern(filename, | |
704 | acl->filename)) | |
705 | continue; | |
706 | } else { | |
707 | continue; | |
708 | } | |
709 | error = 0; | |
710 | break; | |
711 | } | |
b69a54ee KT |
712 | return error; |
713 | } | |
714 | ||
715 | /** | |
716 | * tomoyo_check_file_acl - Check permission for opening files. | |
717 | * | |
718 | * @domain: Pointer to "struct tomoyo_domain_info". | |
719 | * @filename: Filename to check. | |
720 | * @operation: Mode ("read" or "write" or "read/write" or "execute"). | |
721 | * | |
722 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
723 | * |
724 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
725 | */ |
726 | static int tomoyo_check_file_acl(const struct tomoyo_domain_info *domain, | |
727 | const struct tomoyo_path_info *filename, | |
728 | const u8 operation) | |
729 | { | |
937bf613 | 730 | u32 perm = 0; |
b69a54ee KT |
731 | |
732 | if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) | |
733 | return 0; | |
734 | if (operation == 6) | |
735 | perm = 1 << TOMOYO_TYPE_READ_WRITE_ACL; | |
736 | else if (operation == 4) | |
737 | perm = 1 << TOMOYO_TYPE_READ_ACL; | |
738 | else if (operation == 2) | |
739 | perm = 1 << TOMOYO_TYPE_WRITE_ACL; | |
740 | else if (operation == 1) | |
741 | perm = 1 << TOMOYO_TYPE_EXECUTE_ACL; | |
742 | else | |
743 | BUG(); | |
744 | return tomoyo_check_single_path_acl2(domain, filename, perm, | |
745 | operation != 1); | |
746 | } | |
747 | ||
748 | /** | |
749 | * tomoyo_check_file_perm2 - Check permission for opening files. | |
750 | * | |
751 | * @domain: Pointer to "struct tomoyo_domain_info". | |
752 | * @filename: Filename to check. | |
753 | * @perm: Mode ("read" or "write" or "read/write" or "execute"). | |
754 | * @operation: Operation name passed used for verbose mode. | |
755 | * @mode: Access control mode. | |
756 | * | |
757 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
758 | * |
759 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
760 | */ |
761 | static int tomoyo_check_file_perm2(struct tomoyo_domain_info * const domain, | |
762 | const struct tomoyo_path_info *filename, | |
763 | const u8 perm, const char *operation, | |
764 | const u8 mode) | |
765 | { | |
766 | const bool is_enforce = (mode == 3); | |
767 | const char *msg = "<unknown>"; | |
768 | int error = 0; | |
769 | ||
770 | if (!filename) | |
771 | return 0; | |
772 | error = tomoyo_check_file_acl(domain, filename, perm); | |
773 | if (error && perm == 4 && | |
774 | (domain->flags & TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ) == 0 | |
775 | && tomoyo_is_globally_readable_file(filename)) | |
776 | error = 0; | |
777 | if (perm == 6) | |
778 | msg = tomoyo_sp2keyword(TOMOYO_TYPE_READ_WRITE_ACL); | |
779 | else if (perm == 4) | |
780 | msg = tomoyo_sp2keyword(TOMOYO_TYPE_READ_ACL); | |
781 | else if (perm == 2) | |
782 | msg = tomoyo_sp2keyword(TOMOYO_TYPE_WRITE_ACL); | |
783 | else if (perm == 1) | |
784 | msg = tomoyo_sp2keyword(TOMOYO_TYPE_EXECUTE_ACL); | |
785 | else | |
786 | BUG(); | |
787 | if (!error) | |
788 | return 0; | |
789 | if (tomoyo_verbose_mode(domain)) | |
790 | printk(KERN_WARNING "TOMOYO-%s: Access '%s(%s) %s' denied " | |
791 | "for %s\n", tomoyo_get_msg(is_enforce), msg, operation, | |
792 | filename->name, tomoyo_get_last_name(domain)); | |
793 | if (is_enforce) | |
794 | return error; | |
795 | if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { | |
796 | /* Don't use patterns for execute permission. */ | |
797 | const struct tomoyo_path_info *patterned_file = (perm != 1) ? | |
798 | tomoyo_get_file_pattern(filename) : filename; | |
799 | tomoyo_update_file_acl(patterned_file->name, perm, | |
800 | domain, false); | |
801 | } | |
802 | return 0; | |
803 | } | |
804 | ||
805 | /** | |
806 | * tomoyo_write_file_policy - Update file related list. | |
807 | * | |
808 | * @data: String to parse. | |
809 | * @domain: Pointer to "struct tomoyo_domain_info". | |
810 | * @is_delete: True if it is a delete request. | |
811 | * | |
812 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
813 | * |
814 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
815 | */ |
816 | int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, | |
817 | const bool is_delete) | |
818 | { | |
819 | char *filename = strchr(data, ' '); | |
820 | char *filename2; | |
821 | unsigned int perm; | |
822 | u8 type; | |
823 | ||
824 | if (!filename) | |
825 | return -EINVAL; | |
826 | *filename++ = '\0'; | |
827 | if (sscanf(data, "%u", &perm) == 1) | |
828 | return tomoyo_update_file_acl(filename, (u8) perm, domain, | |
829 | is_delete); | |
830 | if (strncmp(data, "allow_", 6)) | |
831 | goto out; | |
832 | data += 6; | |
833 | for (type = 0; type < TOMOYO_MAX_SINGLE_PATH_OPERATION; type++) { | |
834 | if (strcmp(data, tomoyo_sp_keyword[type])) | |
835 | continue; | |
836 | return tomoyo_update_single_path_acl(type, filename, | |
837 | domain, is_delete); | |
838 | } | |
839 | filename2 = strchr(filename, ' '); | |
840 | if (!filename2) | |
841 | goto out; | |
842 | *filename2++ = '\0'; | |
843 | for (type = 0; type < TOMOYO_MAX_DOUBLE_PATH_OPERATION; type++) { | |
844 | if (strcmp(data, tomoyo_dp_keyword[type])) | |
845 | continue; | |
846 | return tomoyo_update_double_path_acl(type, filename, filename2, | |
847 | domain, is_delete); | |
848 | } | |
849 | out: | |
850 | return -EINVAL; | |
851 | } | |
852 | ||
853 | /** | |
854 | * tomoyo_update_single_path_acl - Update "struct tomoyo_single_path_acl_record" list. | |
855 | * | |
856 | * @type: Type of operation. | |
857 | * @filename: Filename. | |
858 | * @domain: Pointer to "struct tomoyo_domain_info". | |
859 | * @is_delete: True if it is a delete request. | |
860 | * | |
861 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
862 | * |
863 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
864 | */ |
865 | static int tomoyo_update_single_path_acl(const u8 type, const char *filename, | |
866 | struct tomoyo_domain_info * | |
867 | const domain, const bool is_delete) | |
868 | { | |
937bf613 | 869 | static const u32 rw_mask = |
b69a54ee KT |
870 | (1 << TOMOYO_TYPE_READ_ACL) | (1 << TOMOYO_TYPE_WRITE_ACL); |
871 | const struct tomoyo_path_info *saved_filename; | |
872 | struct tomoyo_acl_info *ptr; | |
873 | struct tomoyo_single_path_acl_record *acl; | |
874 | int error = -ENOMEM; | |
937bf613 | 875 | const u32 perm = 1 << type; |
b69a54ee KT |
876 | |
877 | if (!domain) | |
878 | return -EINVAL; | |
879 | if (!tomoyo_is_correct_path(filename, 0, 0, 0, __func__)) | |
880 | return -EINVAL; | |
881 | saved_filename = tomoyo_save_name(filename); | |
882 | if (!saved_filename) | |
883 | return -ENOMEM; | |
b69a54ee KT |
884 | down_write(&tomoyo_domain_acl_info_list_lock); |
885 | if (is_delete) | |
886 | goto delete; | |
fdb8ebb7 | 887 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
b69a54ee KT |
888 | if (tomoyo_acl_type1(ptr) != TOMOYO_TYPE_SINGLE_PATH_ACL) |
889 | continue; | |
890 | acl = container_of(ptr, struct tomoyo_single_path_acl_record, | |
891 | head); | |
892 | if (acl->filename != saved_filename) | |
893 | continue; | |
894 | /* Special case. Clear all bits if marked as deleted. */ | |
895 | if (ptr->type & TOMOYO_ACL_DELETED) | |
896 | acl->perm = 0; | |
937bf613 TH |
897 | if (perm <= 0xFFFF) |
898 | acl->perm |= perm; | |
899 | else | |
900 | acl->perm_high |= (perm >> 16); | |
b69a54ee KT |
901 | if ((acl->perm & rw_mask) == rw_mask) |
902 | acl->perm |= 1 << TOMOYO_TYPE_READ_WRITE_ACL; | |
903 | else if (acl->perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL)) | |
904 | acl->perm |= rw_mask; | |
905 | ptr->type &= ~TOMOYO_ACL_DELETED; | |
906 | error = 0; | |
907 | goto out; | |
908 | } | |
909 | /* Not found. Append it to the tail. */ | |
910 | acl = tomoyo_alloc_acl_element(TOMOYO_TYPE_SINGLE_PATH_ACL); | |
911 | if (!acl) | |
912 | goto out; | |
937bf613 TH |
913 | if (perm <= 0xFFFF) |
914 | acl->perm = perm; | |
915 | else | |
916 | acl->perm_high = (perm >> 16); | |
b69a54ee KT |
917 | if (perm == (1 << TOMOYO_TYPE_READ_WRITE_ACL)) |
918 | acl->perm |= rw_mask; | |
919 | acl->filename = saved_filename; | |
fdb8ebb7 | 920 | list_add_tail_rcu(&acl->head.list, &domain->acl_info_list); |
b69a54ee KT |
921 | error = 0; |
922 | goto out; | |
923 | delete: | |
924 | error = -ENOENT; | |
fdb8ebb7 | 925 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
b69a54ee KT |
926 | if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_SINGLE_PATH_ACL) |
927 | continue; | |
928 | acl = container_of(ptr, struct tomoyo_single_path_acl_record, | |
929 | head); | |
930 | if (acl->filename != saved_filename) | |
931 | continue; | |
937bf613 TH |
932 | if (perm <= 0xFFFF) |
933 | acl->perm &= ~perm; | |
934 | else | |
935 | acl->perm_high &= ~(perm >> 16); | |
b69a54ee KT |
936 | if ((acl->perm & rw_mask) != rw_mask) |
937 | acl->perm &= ~(1 << TOMOYO_TYPE_READ_WRITE_ACL); | |
938 | else if (!(acl->perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL))) | |
939 | acl->perm &= ~rw_mask; | |
937bf613 | 940 | if (!acl->perm && !acl->perm_high) |
b69a54ee KT |
941 | ptr->type |= TOMOYO_ACL_DELETED; |
942 | error = 0; | |
943 | break; | |
944 | } | |
945 | out: | |
946 | up_write(&tomoyo_domain_acl_info_list_lock); | |
b69a54ee KT |
947 | return error; |
948 | } | |
949 | ||
950 | /** | |
951 | * tomoyo_update_double_path_acl - Update "struct tomoyo_double_path_acl_record" list. | |
952 | * | |
953 | * @type: Type of operation. | |
954 | * @filename1: First filename. | |
955 | * @filename2: Second filename. | |
956 | * @domain: Pointer to "struct tomoyo_domain_info". | |
957 | * @is_delete: True if it is a delete request. | |
958 | * | |
959 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
960 | * |
961 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
962 | */ |
963 | static int tomoyo_update_double_path_acl(const u8 type, const char *filename1, | |
964 | const char *filename2, | |
965 | struct tomoyo_domain_info * | |
966 | const domain, const bool is_delete) | |
967 | { | |
968 | const struct tomoyo_path_info *saved_filename1; | |
969 | const struct tomoyo_path_info *saved_filename2; | |
970 | struct tomoyo_acl_info *ptr; | |
971 | struct tomoyo_double_path_acl_record *acl; | |
972 | int error = -ENOMEM; | |
973 | const u8 perm = 1 << type; | |
974 | ||
975 | if (!domain) | |
976 | return -EINVAL; | |
977 | if (!tomoyo_is_correct_path(filename1, 0, 0, 0, __func__) || | |
978 | !tomoyo_is_correct_path(filename2, 0, 0, 0, __func__)) | |
979 | return -EINVAL; | |
980 | saved_filename1 = tomoyo_save_name(filename1); | |
981 | saved_filename2 = tomoyo_save_name(filename2); | |
982 | if (!saved_filename1 || !saved_filename2) | |
983 | return -ENOMEM; | |
b69a54ee KT |
984 | down_write(&tomoyo_domain_acl_info_list_lock); |
985 | if (is_delete) | |
986 | goto delete; | |
fdb8ebb7 | 987 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
b69a54ee KT |
988 | if (tomoyo_acl_type1(ptr) != TOMOYO_TYPE_DOUBLE_PATH_ACL) |
989 | continue; | |
990 | acl = container_of(ptr, struct tomoyo_double_path_acl_record, | |
991 | head); | |
992 | if (acl->filename1 != saved_filename1 || | |
993 | acl->filename2 != saved_filename2) | |
994 | continue; | |
995 | /* Special case. Clear all bits if marked as deleted. */ | |
996 | if (ptr->type & TOMOYO_ACL_DELETED) | |
997 | acl->perm = 0; | |
998 | acl->perm |= perm; | |
999 | ptr->type &= ~TOMOYO_ACL_DELETED; | |
1000 | error = 0; | |
1001 | goto out; | |
1002 | } | |
1003 | /* Not found. Append it to the tail. */ | |
1004 | acl = tomoyo_alloc_acl_element(TOMOYO_TYPE_DOUBLE_PATH_ACL); | |
1005 | if (!acl) | |
1006 | goto out; | |
1007 | acl->perm = perm; | |
1008 | acl->filename1 = saved_filename1; | |
1009 | acl->filename2 = saved_filename2; | |
fdb8ebb7 | 1010 | list_add_tail_rcu(&acl->head.list, &domain->acl_info_list); |
b69a54ee KT |
1011 | error = 0; |
1012 | goto out; | |
1013 | delete: | |
1014 | error = -ENOENT; | |
fdb8ebb7 | 1015 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
b69a54ee KT |
1016 | if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_DOUBLE_PATH_ACL) |
1017 | continue; | |
1018 | acl = container_of(ptr, struct tomoyo_double_path_acl_record, | |
1019 | head); | |
1020 | if (acl->filename1 != saved_filename1 || | |
1021 | acl->filename2 != saved_filename2) | |
1022 | continue; | |
1023 | acl->perm &= ~perm; | |
1024 | if (!acl->perm) | |
1025 | ptr->type |= TOMOYO_ACL_DELETED; | |
1026 | error = 0; | |
1027 | break; | |
1028 | } | |
1029 | out: | |
1030 | up_write(&tomoyo_domain_acl_info_list_lock); | |
b69a54ee KT |
1031 | return error; |
1032 | } | |
1033 | ||
1034 | /** | |
1035 | * tomoyo_check_single_path_acl - Check permission for single path operation. | |
1036 | * | |
1037 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1038 | * @type: Type of operation. | |
1039 | * @filename: Filename to check. | |
1040 | * | |
1041 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1042 | * |
1043 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
1044 | */ |
1045 | static int tomoyo_check_single_path_acl(struct tomoyo_domain_info *domain, | |
1046 | const u8 type, | |
1047 | const struct tomoyo_path_info *filename) | |
1048 | { | |
1049 | if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) | |
1050 | return 0; | |
1051 | return tomoyo_check_single_path_acl2(domain, filename, 1 << type, 1); | |
1052 | } | |
1053 | ||
1054 | /** | |
1055 | * tomoyo_check_double_path_acl - Check permission for double path operation. | |
1056 | * | |
1057 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1058 | * @type: Type of operation. | |
1059 | * @filename1: First filename to check. | |
1060 | * @filename2: Second filename to check. | |
1061 | * | |
1062 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
1063 | * |
1064 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
1065 | */ |
1066 | static int tomoyo_check_double_path_acl(const struct tomoyo_domain_info *domain, | |
1067 | const u8 type, | |
1068 | const struct tomoyo_path_info * | |
1069 | filename1, | |
1070 | const struct tomoyo_path_info * | |
1071 | filename2) | |
1072 | { | |
1073 | struct tomoyo_acl_info *ptr; | |
1074 | const u8 perm = 1 << type; | |
1075 | int error = -EPERM; | |
1076 | ||
1077 | if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) | |
1078 | return 0; | |
fdb8ebb7 | 1079 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
b69a54ee KT |
1080 | struct tomoyo_double_path_acl_record *acl; |
1081 | if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_DOUBLE_PATH_ACL) | |
1082 | continue; | |
1083 | acl = container_of(ptr, struct tomoyo_double_path_acl_record, | |
1084 | head); | |
1085 | if (!(acl->perm & perm)) | |
1086 | continue; | |
1087 | if (!tomoyo_path_matches_pattern(filename1, acl->filename1)) | |
1088 | continue; | |
1089 | if (!tomoyo_path_matches_pattern(filename2, acl->filename2)) | |
1090 | continue; | |
1091 | error = 0; | |
1092 | break; | |
1093 | } | |
b69a54ee KT |
1094 | return error; |
1095 | } | |
1096 | ||
1097 | /** | |
1098 | * tomoyo_check_single_path_permission2 - Check permission for single path operation. | |
1099 | * | |
1100 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1101 | * @operation: Type of operation. | |
1102 | * @filename: Filename to check. | |
1103 | * @mode: Access control mode. | |
1104 | * | |
1105 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1106 | * |
1107 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
1108 | */ |
1109 | static int tomoyo_check_single_path_permission2(struct tomoyo_domain_info * | |
1110 | const domain, u8 operation, | |
1111 | const struct tomoyo_path_info * | |
1112 | filename, const u8 mode) | |
1113 | { | |
1114 | const char *msg; | |
1115 | int error; | |
1116 | const bool is_enforce = (mode == 3); | |
1117 | ||
1118 | if (!mode) | |
1119 | return 0; | |
1120 | next: | |
1121 | error = tomoyo_check_single_path_acl(domain, operation, filename); | |
1122 | msg = tomoyo_sp2keyword(operation); | |
1123 | if (!error) | |
1124 | goto ok; | |
1125 | if (tomoyo_verbose_mode(domain)) | |
1126 | printk(KERN_WARNING "TOMOYO-%s: Access '%s %s' denied for %s\n", | |
1127 | tomoyo_get_msg(is_enforce), msg, filename->name, | |
1128 | tomoyo_get_last_name(domain)); | |
1129 | if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { | |
1130 | const char *name = tomoyo_get_file_pattern(filename)->name; | |
1131 | tomoyo_update_single_path_acl(operation, name, domain, false); | |
1132 | } | |
1133 | if (!is_enforce) | |
1134 | error = 0; | |
1135 | ok: | |
1136 | /* | |
1137 | * Since "allow_truncate" doesn't imply "allow_rewrite" permission, | |
1138 | * we need to check "allow_rewrite" permission if the filename is | |
1139 | * specified by "deny_rewrite" keyword. | |
1140 | */ | |
1141 | if (!error && operation == TOMOYO_TYPE_TRUNCATE_ACL && | |
1142 | tomoyo_is_no_rewrite_file(filename)) { | |
1143 | operation = TOMOYO_TYPE_REWRITE_ACL; | |
1144 | goto next; | |
1145 | } | |
1146 | return error; | |
1147 | } | |
1148 | ||
b69a54ee KT |
1149 | /** |
1150 | * tomoyo_check_exec_perm - Check permission for "execute". | |
1151 | * | |
1152 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1153 | * @filename: Check permission for "execute". | |
b69a54ee KT |
1154 | * |
1155 | * Returns 0 on success, negativevalue otherwise. | |
fdb8ebb7 TH |
1156 | * |
1157 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
1158 | */ |
1159 | int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain, | |
bcb86975 | 1160 | const struct tomoyo_path_info *filename) |
b69a54ee KT |
1161 | { |
1162 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1163 | ||
1164 | if (!mode) | |
1165 | return 0; | |
1166 | return tomoyo_check_file_perm2(domain, filename, 1, "do_execve", mode); | |
1167 | } | |
1168 | ||
1169 | /** | |
1170 | * tomoyo_check_open_permission - Check permission for "read" and "write". | |
1171 | * | |
1172 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1173 | * @path: Pointer to "struct path". | |
1174 | * @flag: Flags for open(). | |
1175 | * | |
1176 | * Returns 0 on success, negative value otherwise. | |
1177 | */ | |
1178 | int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, | |
1179 | struct path *path, const int flag) | |
1180 | { | |
1181 | const u8 acc_mode = ACC_MODE(flag); | |
1182 | int error = -ENOMEM; | |
1183 | struct tomoyo_path_info *buf; | |
1184 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1185 | const bool is_enforce = (mode == 3); | |
fdb8ebb7 | 1186 | int idx; |
b69a54ee KT |
1187 | |
1188 | if (!mode || !path->mnt) | |
1189 | return 0; | |
1190 | if (acc_mode == 0) | |
1191 | return 0; | |
1192 | if (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode)) | |
1193 | /* | |
1194 | * I don't check directories here because mkdir() and rmdir() | |
1195 | * don't call me. | |
1196 | */ | |
1197 | return 0; | |
fdb8ebb7 | 1198 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1199 | buf = tomoyo_get_path(path); |
1200 | if (!buf) | |
1201 | goto out; | |
1202 | error = 0; | |
1203 | /* | |
1204 | * If the filename is specified by "deny_rewrite" keyword, | |
1205 | * we need to check "allow_rewrite" permission when the filename is not | |
1206 | * opened for append mode or the filename is truncated at open time. | |
1207 | */ | |
1208 | if ((acc_mode & MAY_WRITE) && | |
1209 | ((flag & O_TRUNC) || !(flag & O_APPEND)) && | |
1210 | (tomoyo_is_no_rewrite_file(buf))) { | |
1211 | error = tomoyo_check_single_path_permission2(domain, | |
1212 | TOMOYO_TYPE_REWRITE_ACL, | |
1213 | buf, mode); | |
1214 | } | |
1215 | if (!error) | |
1216 | error = tomoyo_check_file_perm2(domain, buf, acc_mode, "open", | |
1217 | mode); | |
1218 | if (!error && (flag & O_TRUNC)) | |
1219 | error = tomoyo_check_single_path_permission2(domain, | |
1220 | TOMOYO_TYPE_TRUNCATE_ACL, | |
1221 | buf, mode); | |
1222 | out: | |
1223 | tomoyo_free(buf); | |
fdb8ebb7 | 1224 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1225 | if (!is_enforce) |
1226 | error = 0; | |
1227 | return error; | |
1228 | } | |
1229 | ||
1230 | /** | |
937bf613 | 1231 | * tomoyo_check_1path_perm - Check permission for "create", "unlink", "mkdir", "rmdir", "mkfifo", "mksock", "mkblock", "mkchar", "truncate", "symlink", "ioctl", "chmod", "chown", "chgrp", "chroot", "mount" and "unmount". |
b69a54ee KT |
1232 | * |
1233 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1234 | * @operation: Type of operation. | |
1235 | * @path: Pointer to "struct path". | |
1236 | * | |
1237 | * Returns 0 on success, negative value otherwise. | |
1238 | */ | |
1239 | int tomoyo_check_1path_perm(struct tomoyo_domain_info *domain, | |
1240 | const u8 operation, struct path *path) | |
1241 | { | |
1242 | int error = -ENOMEM; | |
1243 | struct tomoyo_path_info *buf; | |
1244 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1245 | const bool is_enforce = (mode == 3); | |
fdb8ebb7 | 1246 | int idx; |
b69a54ee KT |
1247 | |
1248 | if (!mode || !path->mnt) | |
1249 | return 0; | |
fdb8ebb7 | 1250 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1251 | buf = tomoyo_get_path(path); |
1252 | if (!buf) | |
1253 | goto out; | |
1254 | switch (operation) { | |
1255 | case TOMOYO_TYPE_MKDIR_ACL: | |
1256 | case TOMOYO_TYPE_RMDIR_ACL: | |
937bf613 | 1257 | case TOMOYO_TYPE_CHROOT_ACL: |
b69a54ee KT |
1258 | if (!buf->is_dir) { |
1259 | /* | |
1260 | * tomoyo_get_path() reserves space for appending "/." | |
1261 | */ | |
1262 | strcat((char *) buf->name, "/"); | |
1263 | tomoyo_fill_path_info(buf); | |
1264 | } | |
1265 | } | |
1266 | error = tomoyo_check_single_path_permission2(domain, operation, buf, | |
1267 | mode); | |
1268 | out: | |
1269 | tomoyo_free(buf); | |
fdb8ebb7 | 1270 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1271 | if (!is_enforce) |
1272 | error = 0; | |
1273 | return error; | |
1274 | } | |
1275 | ||
1276 | /** | |
1277 | * tomoyo_check_rewrite_permission - Check permission for "rewrite". | |
1278 | * | |
1279 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1280 | * @filp: Pointer to "struct file". | |
1281 | * | |
1282 | * Returns 0 on success, negative value otherwise. | |
1283 | */ | |
1284 | int tomoyo_check_rewrite_permission(struct tomoyo_domain_info *domain, | |
1285 | struct file *filp) | |
1286 | { | |
1287 | int error = -ENOMEM; | |
1288 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1289 | const bool is_enforce = (mode == 3); | |
1290 | struct tomoyo_path_info *buf; | |
fdb8ebb7 | 1291 | int idx; |
b69a54ee KT |
1292 | |
1293 | if (!mode || !filp->f_path.mnt) | |
1294 | return 0; | |
fdb8ebb7 TH |
1295 | |
1296 | idx = tomoyo_read_lock(); | |
b69a54ee KT |
1297 | buf = tomoyo_get_path(&filp->f_path); |
1298 | if (!buf) | |
1299 | goto out; | |
1300 | if (!tomoyo_is_no_rewrite_file(buf)) { | |
1301 | error = 0; | |
1302 | goto out; | |
1303 | } | |
1304 | error = tomoyo_check_single_path_permission2(domain, | |
1305 | TOMOYO_TYPE_REWRITE_ACL, | |
1306 | buf, mode); | |
1307 | out: | |
1308 | tomoyo_free(buf); | |
fdb8ebb7 | 1309 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1310 | if (!is_enforce) |
1311 | error = 0; | |
1312 | return error; | |
1313 | } | |
1314 | ||
1315 | /** | |
937bf613 | 1316 | * tomoyo_check_2path_perm - Check permission for "rename", "link" and "pivot_root". |
b69a54ee KT |
1317 | * |
1318 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1319 | * @operation: Type of operation. | |
1320 | * @path1: Pointer to "struct path". | |
1321 | * @path2: Pointer to "struct path". | |
1322 | * | |
1323 | * Returns 0 on success, negative value otherwise. | |
1324 | */ | |
1325 | int tomoyo_check_2path_perm(struct tomoyo_domain_info * const domain, | |
1326 | const u8 operation, struct path *path1, | |
1327 | struct path *path2) | |
1328 | { | |
1329 | int error = -ENOMEM; | |
1330 | struct tomoyo_path_info *buf1, *buf2; | |
1331 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1332 | const bool is_enforce = (mode == 3); | |
1333 | const char *msg; | |
fdb8ebb7 | 1334 | int idx; |
b69a54ee KT |
1335 | |
1336 | if (!mode || !path1->mnt || !path2->mnt) | |
1337 | return 0; | |
fdb8ebb7 | 1338 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1339 | buf1 = tomoyo_get_path(path1); |
1340 | buf2 = tomoyo_get_path(path2); | |
1341 | if (!buf1 || !buf2) | |
1342 | goto out; | |
1343 | { | |
1344 | struct dentry *dentry = path1->dentry; | |
1345 | if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) { | |
1346 | /* | |
1347 | * tomoyo_get_path() reserves space for appending "/." | |
1348 | */ | |
1349 | if (!buf1->is_dir) { | |
1350 | strcat((char *) buf1->name, "/"); | |
1351 | tomoyo_fill_path_info(buf1); | |
1352 | } | |
1353 | if (!buf2->is_dir) { | |
1354 | strcat((char *) buf2->name, "/"); | |
1355 | tomoyo_fill_path_info(buf2); | |
1356 | } | |
1357 | } | |
1358 | } | |
1359 | error = tomoyo_check_double_path_acl(domain, operation, buf1, buf2); | |
1360 | msg = tomoyo_dp2keyword(operation); | |
1361 | if (!error) | |
1362 | goto out; | |
1363 | if (tomoyo_verbose_mode(domain)) | |
1364 | printk(KERN_WARNING "TOMOYO-%s: Access '%s %s %s' " | |
1365 | "denied for %s\n", tomoyo_get_msg(is_enforce), | |
1366 | msg, buf1->name, buf2->name, | |
1367 | tomoyo_get_last_name(domain)); | |
1368 | if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { | |
1369 | const char *name1 = tomoyo_get_file_pattern(buf1)->name; | |
1370 | const char *name2 = tomoyo_get_file_pattern(buf2)->name; | |
1371 | tomoyo_update_double_path_acl(operation, name1, name2, domain, | |
1372 | false); | |
1373 | } | |
1374 | out: | |
1375 | tomoyo_free(buf1); | |
1376 | tomoyo_free(buf2); | |
fdb8ebb7 | 1377 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1378 | if (!is_enforce) |
1379 | error = 0; | |
1380 | return error; | |
1381 | } |