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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" | |
b69a54ee | 15 | |
c3fa109a TH |
16 | /* |
17 | * tomoyo_globally_readable_file_entry is a structure which is used for holding | |
18 | * "allow_read" entries. | |
19 | * It has following fields. | |
20 | * | |
21 | * (1) "list" which is linked to tomoyo_globally_readable_list . | |
22 | * (2) "filename" is a pathname which is allowed to open(O_RDONLY). | |
23 | * (3) "is_deleted" is a bool which is true if marked as deleted, false | |
24 | * otherwise. | |
25 | */ | |
b69a54ee KT |
26 | struct tomoyo_globally_readable_file_entry { |
27 | struct list_head list; | |
28 | const struct tomoyo_path_info *filename; | |
29 | bool is_deleted; | |
30 | }; | |
31 | ||
c3fa109a TH |
32 | /* |
33 | * tomoyo_pattern_entry is a structure which is used for holding | |
34 | * "tomoyo_pattern_list" entries. | |
35 | * It has following fields. | |
36 | * | |
37 | * (1) "list" which is linked to tomoyo_pattern_list . | |
38 | * (2) "pattern" is a pathname pattern which is used for converting pathnames | |
39 | * to pathname patterns during learning mode. | |
40 | * (3) "is_deleted" is a bool which is true if marked as deleted, false | |
41 | * otherwise. | |
42 | */ | |
b69a54ee KT |
43 | struct tomoyo_pattern_entry { |
44 | struct list_head list; | |
45 | const struct tomoyo_path_info *pattern; | |
46 | bool is_deleted; | |
47 | }; | |
48 | ||
c3fa109a TH |
49 | /* |
50 | * tomoyo_no_rewrite_entry is a structure which is used for holding | |
51 | * "deny_rewrite" entries. | |
52 | * It has following fields. | |
53 | * | |
54 | * (1) "list" which is linked to tomoyo_no_rewrite_list . | |
55 | * (2) "pattern" is a pathname which is by default not permitted to modify | |
56 | * already existing content. | |
57 | * (3) "is_deleted" is a bool which is true if marked as deleted, false | |
58 | * otherwise. | |
59 | */ | |
b69a54ee KT |
60 | struct tomoyo_no_rewrite_entry { |
61 | struct list_head list; | |
62 | const struct tomoyo_path_info *pattern; | |
63 | bool is_deleted; | |
64 | }; | |
65 | ||
66 | /* Keyword array for single path operations. */ | |
67 | static const char *tomoyo_sp_keyword[TOMOYO_MAX_SINGLE_PATH_OPERATION] = { | |
68 | [TOMOYO_TYPE_READ_WRITE_ACL] = "read/write", | |
69 | [TOMOYO_TYPE_EXECUTE_ACL] = "execute", | |
70 | [TOMOYO_TYPE_READ_ACL] = "read", | |
71 | [TOMOYO_TYPE_WRITE_ACL] = "write", | |
72 | [TOMOYO_TYPE_CREATE_ACL] = "create", | |
73 | [TOMOYO_TYPE_UNLINK_ACL] = "unlink", | |
74 | [TOMOYO_TYPE_MKDIR_ACL] = "mkdir", | |
75 | [TOMOYO_TYPE_RMDIR_ACL] = "rmdir", | |
76 | [TOMOYO_TYPE_MKFIFO_ACL] = "mkfifo", | |
77 | [TOMOYO_TYPE_MKSOCK_ACL] = "mksock", | |
78 | [TOMOYO_TYPE_MKBLOCK_ACL] = "mkblock", | |
79 | [TOMOYO_TYPE_MKCHAR_ACL] = "mkchar", | |
80 | [TOMOYO_TYPE_TRUNCATE_ACL] = "truncate", | |
81 | [TOMOYO_TYPE_SYMLINK_ACL] = "symlink", | |
82 | [TOMOYO_TYPE_REWRITE_ACL] = "rewrite", | |
937bf613 TH |
83 | [TOMOYO_TYPE_IOCTL_ACL] = "ioctl", |
84 | [TOMOYO_TYPE_CHMOD_ACL] = "chmod", | |
85 | [TOMOYO_TYPE_CHOWN_ACL] = "chown", | |
86 | [TOMOYO_TYPE_CHGRP_ACL] = "chgrp", | |
87 | [TOMOYO_TYPE_CHROOT_ACL] = "chroot", | |
88 | [TOMOYO_TYPE_MOUNT_ACL] = "mount", | |
89 | [TOMOYO_TYPE_UMOUNT_ACL] = "unmount", | |
b69a54ee KT |
90 | }; |
91 | ||
92 | /* Keyword array for double path operations. */ | |
93 | static const char *tomoyo_dp_keyword[TOMOYO_MAX_DOUBLE_PATH_OPERATION] = { | |
94 | [TOMOYO_TYPE_LINK_ACL] = "link", | |
95 | [TOMOYO_TYPE_RENAME_ACL] = "rename", | |
937bf613 | 96 | [TOMOYO_TYPE_PIVOT_ROOT_ACL] = "pivot_root", |
b69a54ee KT |
97 | }; |
98 | ||
99 | /** | |
100 | * tomoyo_sp2keyword - Get the name of single path operation. | |
101 | * | |
102 | * @operation: Type of operation. | |
103 | * | |
104 | * Returns the name of single path operation. | |
105 | */ | |
106 | const char *tomoyo_sp2keyword(const u8 operation) | |
107 | { | |
108 | return (operation < TOMOYO_MAX_SINGLE_PATH_OPERATION) | |
109 | ? tomoyo_sp_keyword[operation] : NULL; | |
110 | } | |
111 | ||
112 | /** | |
113 | * tomoyo_dp2keyword - Get the name of double path operation. | |
114 | * | |
115 | * @operation: Type of operation. | |
116 | * | |
117 | * Returns the name of double path operation. | |
118 | */ | |
119 | const char *tomoyo_dp2keyword(const u8 operation) | |
120 | { | |
121 | return (operation < TOMOYO_MAX_DOUBLE_PATH_OPERATION) | |
122 | ? tomoyo_dp_keyword[operation] : NULL; | |
123 | } | |
124 | ||
125 | /** | |
126 | * tomoyo_strendswith - Check whether the token ends with the given token. | |
127 | * | |
128 | * @name: The token to check. | |
129 | * @tail: The token to find. | |
130 | * | |
131 | * Returns true if @name ends with @tail, false otherwise. | |
132 | */ | |
133 | static bool tomoyo_strendswith(const char *name, const char *tail) | |
134 | { | |
135 | int len; | |
136 | ||
137 | if (!name || !tail) | |
138 | return false; | |
139 | len = strlen(name) - strlen(tail); | |
140 | return len >= 0 && !strcmp(name + len, tail); | |
141 | } | |
142 | ||
143 | /** | |
144 | * tomoyo_get_path - Get realpath. | |
145 | * | |
146 | * @path: Pointer to "struct path". | |
147 | * | |
148 | * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise. | |
149 | */ | |
150 | static struct tomoyo_path_info *tomoyo_get_path(struct path *path) | |
151 | { | |
152 | int error; | |
8e2d39a1 TH |
153 | struct tomoyo_path_info_with_data *buf = kzalloc(sizeof(*buf), |
154 | GFP_KERNEL); | |
b69a54ee KT |
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 | } | |
8e2d39a1 | 166 | kfree(buf); |
b69a54ee KT |
167 | return NULL; |
168 | } | |
169 | ||
b69a54ee KT |
170 | static int tomoyo_update_double_path_acl(const u8 type, const char *filename1, |
171 | const char *filename2, | |
172 | struct tomoyo_domain_info * | |
173 | const domain, const bool is_delete); | |
174 | static int tomoyo_update_single_path_acl(const u8 type, const char *filename, | |
175 | struct tomoyo_domain_info * | |
176 | const domain, const bool is_delete); | |
177 | ||
c3fa109a TH |
178 | /* |
179 | * tomoyo_globally_readable_list is used for holding list of pathnames which | |
180 | * are by default allowed to be open()ed for reading by any process. | |
181 | * | |
182 | * An entry is added by | |
183 | * | |
184 | * # echo 'allow_read /lib/libc-2.5.so' > \ | |
185 | * /sys/kernel/security/tomoyo/exception_policy | |
186 | * | |
187 | * and is deleted by | |
188 | * | |
189 | * # echo 'delete allow_read /lib/libc-2.5.so' > \ | |
190 | * /sys/kernel/security/tomoyo/exception_policy | |
191 | * | |
192 | * and all entries are retrieved by | |
193 | * | |
194 | * # grep ^allow_read /sys/kernel/security/tomoyo/exception_policy | |
195 | * | |
196 | * In the example above, any process is allowed to | |
197 | * open("/lib/libc-2.5.so", O_RDONLY). | |
198 | * One exception is, if the domain which current process belongs to is marked | |
199 | * as "ignore_global_allow_read", current process can't do so unless explicitly | |
200 | * given "allow_read /lib/libc-2.5.so" to the domain which current process | |
201 | * belongs to. | |
202 | */ | |
b69a54ee | 203 | static LIST_HEAD(tomoyo_globally_readable_list); |
b69a54ee KT |
204 | |
205 | /** | |
206 | * tomoyo_update_globally_readable_entry - Update "struct tomoyo_globally_readable_file_entry" list. | |
207 | * | |
208 | * @filename: Filename unconditionally permitted to open() for reading. | |
209 | * @is_delete: True if it is a delete request. | |
210 | * | |
211 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
212 | * |
213 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
214 | */ |
215 | static int tomoyo_update_globally_readable_entry(const char *filename, | |
216 | const bool is_delete) | |
217 | { | |
218 | struct tomoyo_globally_readable_file_entry *new_entry; | |
219 | struct tomoyo_globally_readable_file_entry *ptr; | |
220 | const struct tomoyo_path_info *saved_filename; | |
221 | int error = -ENOMEM; | |
222 | ||
223 | if (!tomoyo_is_correct_path(filename, 1, 0, -1, __func__)) | |
224 | return -EINVAL; | |
225 | saved_filename = tomoyo_save_name(filename); | |
226 | if (!saved_filename) | |
227 | return -ENOMEM; | |
cd7bec6a | 228 | new_entry = kmalloc(sizeof(*new_entry), GFP_KERNEL); |
f737d95d | 229 | mutex_lock(&tomoyo_policy_lock); |
fdb8ebb7 | 230 | list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { |
b69a54ee KT |
231 | if (ptr->filename != saved_filename) |
232 | continue; | |
233 | ptr->is_deleted = is_delete; | |
234 | error = 0; | |
235 | goto out; | |
236 | } | |
237 | if (is_delete) { | |
238 | error = -ENOENT; | |
239 | goto out; | |
240 | } | |
cd7bec6a | 241 | if (!tomoyo_memory_ok(new_entry)) |
b69a54ee KT |
242 | goto out; |
243 | new_entry->filename = saved_filename; | |
fdb8ebb7 | 244 | list_add_tail_rcu(&new_entry->list, &tomoyo_globally_readable_list); |
cd7bec6a | 245 | new_entry = NULL; |
b69a54ee KT |
246 | error = 0; |
247 | out: | |
f737d95d | 248 | mutex_unlock(&tomoyo_policy_lock); |
cd7bec6a | 249 | kfree(new_entry); |
b69a54ee KT |
250 | return error; |
251 | } | |
252 | ||
253 | /** | |
254 | * tomoyo_is_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading. | |
255 | * | |
256 | * @filename: The filename to check. | |
257 | * | |
258 | * Returns true if any domain can open @filename for reading, false otherwise. | |
fdb8ebb7 TH |
259 | * |
260 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
261 | */ |
262 | static bool tomoyo_is_globally_readable_file(const struct tomoyo_path_info * | |
263 | filename) | |
264 | { | |
265 | struct tomoyo_globally_readable_file_entry *ptr; | |
266 | bool found = false; | |
fdb8ebb7 TH |
267 | |
268 | list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { | |
b69a54ee KT |
269 | if (!ptr->is_deleted && |
270 | tomoyo_path_matches_pattern(filename, ptr->filename)) { | |
271 | found = true; | |
272 | break; | |
273 | } | |
274 | } | |
b69a54ee KT |
275 | return found; |
276 | } | |
277 | ||
278 | /** | |
279 | * tomoyo_write_globally_readable_policy - Write "struct tomoyo_globally_readable_file_entry" list. | |
280 | * | |
281 | * @data: String to parse. | |
282 | * @is_delete: True if it is a delete request. | |
283 | * | |
284 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
285 | * |
286 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
287 | */ |
288 | int tomoyo_write_globally_readable_policy(char *data, const bool is_delete) | |
289 | { | |
290 | return tomoyo_update_globally_readable_entry(data, is_delete); | |
291 | } | |
292 | ||
293 | /** | |
294 | * tomoyo_read_globally_readable_policy - Read "struct tomoyo_globally_readable_file_entry" list. | |
295 | * | |
296 | * @head: Pointer to "struct tomoyo_io_buffer". | |
297 | * | |
298 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
299 | * |
300 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
301 | */ |
302 | bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head) | |
303 | { | |
304 | struct list_head *pos; | |
305 | bool done = true; | |
306 | ||
b69a54ee KT |
307 | list_for_each_cookie(pos, head->read_var2, |
308 | &tomoyo_globally_readable_list) { | |
309 | struct tomoyo_globally_readable_file_entry *ptr; | |
310 | ptr = list_entry(pos, | |
311 | struct tomoyo_globally_readable_file_entry, | |
312 | list); | |
313 | if (ptr->is_deleted) | |
314 | continue; | |
7d2948b1 TH |
315 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_READ "%s\n", |
316 | ptr->filename->name); | |
317 | if (!done) | |
b69a54ee | 318 | break; |
b69a54ee | 319 | } |
b69a54ee KT |
320 | return done; |
321 | } | |
322 | ||
c3fa109a TH |
323 | /* tomoyo_pattern_list is used for holding list of pathnames which are used for |
324 | * converting pathnames to pathname patterns during learning mode. | |
325 | * | |
326 | * An entry is added by | |
327 | * | |
328 | * # echo 'file_pattern /proc/\$/mounts' > \ | |
329 | * /sys/kernel/security/tomoyo/exception_policy | |
330 | * | |
331 | * and is deleted by | |
332 | * | |
333 | * # echo 'delete file_pattern /proc/\$/mounts' > \ | |
334 | * /sys/kernel/security/tomoyo/exception_policy | |
335 | * | |
336 | * and all entries are retrieved by | |
337 | * | |
338 | * # grep ^file_pattern /sys/kernel/security/tomoyo/exception_policy | |
339 | * | |
340 | * In the example above, if a process which belongs to a domain which is in | |
341 | * learning mode requested open("/proc/1/mounts", O_RDONLY), | |
342 | * "allow_read /proc/\$/mounts" is automatically added to the domain which that | |
343 | * process belongs to. | |
344 | * | |
345 | * It is not a desirable behavior that we have to use /proc/\$/ instead of | |
346 | * /proc/self/ when current process needs to access only current process's | |
347 | * information. As of now, LSM version of TOMOYO is using __d_path() for | |
348 | * calculating pathname. Non LSM version of TOMOYO is using its own function | |
349 | * which pretends as if /proc/self/ is not a symlink; so that we can forbid | |
350 | * current process from accessing other process's information. | |
351 | */ | |
b69a54ee | 352 | static LIST_HEAD(tomoyo_pattern_list); |
b69a54ee KT |
353 | |
354 | /** | |
355 | * tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list. | |
356 | * | |
357 | * @pattern: Pathname pattern. | |
358 | * @is_delete: True if it is a delete request. | |
359 | * | |
360 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
361 | * |
362 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
363 | */ |
364 | static int tomoyo_update_file_pattern_entry(const char *pattern, | |
365 | const bool is_delete) | |
366 | { | |
367 | struct tomoyo_pattern_entry *new_entry; | |
368 | struct tomoyo_pattern_entry *ptr; | |
369 | const struct tomoyo_path_info *saved_pattern; | |
370 | int error = -ENOMEM; | |
371 | ||
372 | if (!tomoyo_is_correct_path(pattern, 0, 1, 0, __func__)) | |
373 | return -EINVAL; | |
374 | saved_pattern = tomoyo_save_name(pattern); | |
375 | if (!saved_pattern) | |
376 | return -ENOMEM; | |
cd7bec6a | 377 | new_entry = kmalloc(sizeof(*new_entry), GFP_KERNEL); |
f737d95d | 378 | mutex_lock(&tomoyo_policy_lock); |
fdb8ebb7 | 379 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { |
b69a54ee KT |
380 | if (saved_pattern != ptr->pattern) |
381 | continue; | |
382 | ptr->is_deleted = is_delete; | |
383 | error = 0; | |
384 | goto out; | |
385 | } | |
386 | if (is_delete) { | |
387 | error = -ENOENT; | |
388 | goto out; | |
389 | } | |
cd7bec6a | 390 | if (!tomoyo_memory_ok(new_entry)) |
b69a54ee KT |
391 | goto out; |
392 | new_entry->pattern = saved_pattern; | |
fdb8ebb7 | 393 | list_add_tail_rcu(&new_entry->list, &tomoyo_pattern_list); |
cd7bec6a | 394 | new_entry = NULL; |
b69a54ee KT |
395 | error = 0; |
396 | out: | |
f737d95d | 397 | mutex_unlock(&tomoyo_policy_lock); |
cd7bec6a | 398 | kfree(new_entry); |
b69a54ee KT |
399 | return error; |
400 | } | |
401 | ||
402 | /** | |
403 | * tomoyo_get_file_pattern - Get patterned pathname. | |
404 | * | |
405 | * @filename: The filename to find patterned pathname. | |
406 | * | |
407 | * Returns pointer to pathname pattern if matched, @filename otherwise. | |
fdb8ebb7 TH |
408 | * |
409 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
410 | */ |
411 | static const struct tomoyo_path_info * | |
412 | tomoyo_get_file_pattern(const struct tomoyo_path_info *filename) | |
413 | { | |
414 | struct tomoyo_pattern_entry *ptr; | |
415 | const struct tomoyo_path_info *pattern = NULL; | |
416 | ||
fdb8ebb7 | 417 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { |
b69a54ee KT |
418 | if (ptr->is_deleted) |
419 | continue; | |
420 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
421 | continue; | |
422 | pattern = ptr->pattern; | |
423 | if (tomoyo_strendswith(pattern->name, "/\\*")) { | |
424 | /* Do nothing. Try to find the better match. */ | |
425 | } else { | |
426 | /* This would be the better match. Use this. */ | |
427 | break; | |
428 | } | |
429 | } | |
b69a54ee KT |
430 | if (pattern) |
431 | filename = pattern; | |
432 | return filename; | |
433 | } | |
434 | ||
435 | /** | |
436 | * tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list. | |
437 | * | |
438 | * @data: String to parse. | |
439 | * @is_delete: True if it is a delete request. | |
440 | * | |
441 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
442 | * |
443 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
444 | */ |
445 | int tomoyo_write_pattern_policy(char *data, const bool is_delete) | |
446 | { | |
447 | return tomoyo_update_file_pattern_entry(data, is_delete); | |
448 | } | |
449 | ||
450 | /** | |
451 | * tomoyo_read_file_pattern - Read "struct tomoyo_pattern_entry" list. | |
452 | * | |
453 | * @head: Pointer to "struct tomoyo_io_buffer". | |
454 | * | |
455 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
456 | * |
457 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
458 | */ |
459 | bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head) | |
460 | { | |
461 | struct list_head *pos; | |
462 | bool done = true; | |
463 | ||
b69a54ee KT |
464 | list_for_each_cookie(pos, head->read_var2, &tomoyo_pattern_list) { |
465 | struct tomoyo_pattern_entry *ptr; | |
466 | ptr = list_entry(pos, struct tomoyo_pattern_entry, list); | |
467 | if (ptr->is_deleted) | |
468 | continue; | |
7d2948b1 TH |
469 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_FILE_PATTERN |
470 | "%s\n", ptr->pattern->name); | |
471 | if (!done) | |
b69a54ee | 472 | break; |
b69a54ee | 473 | } |
b69a54ee KT |
474 | return done; |
475 | } | |
476 | ||
c3fa109a TH |
477 | /* |
478 | * tomoyo_no_rewrite_list is used for holding list of pathnames which are by | |
479 | * default forbidden to modify already written content of a file. | |
480 | * | |
481 | * An entry is added by | |
482 | * | |
483 | * # echo 'deny_rewrite /var/log/messages' > \ | |
484 | * /sys/kernel/security/tomoyo/exception_policy | |
485 | * | |
486 | * and is deleted by | |
487 | * | |
488 | * # echo 'delete deny_rewrite /var/log/messages' > \ | |
489 | * /sys/kernel/security/tomoyo/exception_policy | |
490 | * | |
491 | * and all entries are retrieved by | |
492 | * | |
493 | * # grep ^deny_rewrite /sys/kernel/security/tomoyo/exception_policy | |
494 | * | |
495 | * In the example above, if a process requested to rewrite /var/log/messages , | |
496 | * the process can't rewrite unless the domain which that process belongs to | |
497 | * has "allow_rewrite /var/log/messages" entry. | |
498 | * | |
499 | * It is not a desirable behavior that we have to add "\040(deleted)" suffix | |
500 | * when we want to allow rewriting already unlink()ed file. As of now, | |
501 | * LSM version of TOMOYO is using __d_path() for calculating pathname. | |
502 | * Non LSM version of TOMOYO is using its own function which doesn't append | |
503 | * " (deleted)" suffix if the file is already unlink()ed; so that we don't | |
504 | * need to worry whether the file is already unlink()ed or not. | |
505 | */ | |
b69a54ee | 506 | static LIST_HEAD(tomoyo_no_rewrite_list); |
b69a54ee KT |
507 | |
508 | /** | |
509 | * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list. | |
510 | * | |
511 | * @pattern: Pathname pattern that are not rewritable by default. | |
512 | * @is_delete: True if it is a delete request. | |
513 | * | |
514 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
515 | * |
516 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
517 | */ |
518 | static int tomoyo_update_no_rewrite_entry(const char *pattern, | |
519 | const bool is_delete) | |
520 | { | |
521 | struct tomoyo_no_rewrite_entry *new_entry, *ptr; | |
522 | const struct tomoyo_path_info *saved_pattern; | |
523 | int error = -ENOMEM; | |
524 | ||
525 | if (!tomoyo_is_correct_path(pattern, 0, 0, 0, __func__)) | |
526 | return -EINVAL; | |
527 | saved_pattern = tomoyo_save_name(pattern); | |
528 | if (!saved_pattern) | |
529 | return -ENOMEM; | |
cd7bec6a | 530 | new_entry = kmalloc(sizeof(*new_entry), GFP_KERNEL); |
f737d95d | 531 | mutex_lock(&tomoyo_policy_lock); |
fdb8ebb7 | 532 | list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { |
b69a54ee KT |
533 | if (ptr->pattern != saved_pattern) |
534 | continue; | |
535 | ptr->is_deleted = is_delete; | |
536 | error = 0; | |
537 | goto out; | |
538 | } | |
539 | if (is_delete) { | |
540 | error = -ENOENT; | |
541 | goto out; | |
542 | } | |
cd7bec6a | 543 | if (!tomoyo_memory_ok(new_entry)) |
b69a54ee KT |
544 | goto out; |
545 | new_entry->pattern = saved_pattern; | |
fdb8ebb7 | 546 | list_add_tail_rcu(&new_entry->list, &tomoyo_no_rewrite_list); |
cd7bec6a | 547 | new_entry = NULL; |
b69a54ee KT |
548 | error = 0; |
549 | out: | |
f737d95d | 550 | mutex_unlock(&tomoyo_policy_lock); |
cd7bec6a | 551 | kfree(new_entry); |
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 | 690 | struct tomoyo_single_path_acl_record *acl; |
ea13ddba | 691 | if (ptr->type != TOMOYO_TYPE_SINGLE_PATH_ACL) |
b69a54ee KT |
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); | |
ea13ddba | 773 | if (error && perm == 4 && !domain->ignore_global_allow_read |
b69a54ee KT |
774 | && tomoyo_is_globally_readable_file(filename)) |
775 | error = 0; | |
776 | if (perm == 6) | |
777 | msg = tomoyo_sp2keyword(TOMOYO_TYPE_READ_WRITE_ACL); | |
778 | else if (perm == 4) | |
779 | msg = tomoyo_sp2keyword(TOMOYO_TYPE_READ_ACL); | |
780 | else if (perm == 2) | |
781 | msg = tomoyo_sp2keyword(TOMOYO_TYPE_WRITE_ACL); | |
782 | else if (perm == 1) | |
783 | msg = tomoyo_sp2keyword(TOMOYO_TYPE_EXECUTE_ACL); | |
784 | else | |
785 | BUG(); | |
786 | if (!error) | |
787 | return 0; | |
788 | if (tomoyo_verbose_mode(domain)) | |
789 | printk(KERN_WARNING "TOMOYO-%s: Access '%s(%s) %s' denied " | |
790 | "for %s\n", tomoyo_get_msg(is_enforce), msg, operation, | |
791 | filename->name, tomoyo_get_last_name(domain)); | |
792 | if (is_enforce) | |
793 | return error; | |
794 | if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { | |
795 | /* Don't use patterns for execute permission. */ | |
796 | const struct tomoyo_path_info *patterned_file = (perm != 1) ? | |
797 | tomoyo_get_file_pattern(filename) : filename; | |
798 | tomoyo_update_file_acl(patterned_file->name, perm, | |
799 | domain, false); | |
800 | } | |
801 | return 0; | |
802 | } | |
803 | ||
804 | /** | |
805 | * tomoyo_write_file_policy - Update file related list. | |
806 | * | |
807 | * @data: String to parse. | |
808 | * @domain: Pointer to "struct tomoyo_domain_info". | |
809 | * @is_delete: True if it is a delete request. | |
810 | * | |
811 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
812 | * |
813 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
814 | */ |
815 | int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, | |
816 | const bool is_delete) | |
817 | { | |
818 | char *filename = strchr(data, ' '); | |
819 | char *filename2; | |
820 | unsigned int perm; | |
821 | u8 type; | |
822 | ||
823 | if (!filename) | |
824 | return -EINVAL; | |
825 | *filename++ = '\0'; | |
826 | if (sscanf(data, "%u", &perm) == 1) | |
827 | return tomoyo_update_file_acl(filename, (u8) perm, domain, | |
828 | is_delete); | |
829 | if (strncmp(data, "allow_", 6)) | |
830 | goto out; | |
831 | data += 6; | |
832 | for (type = 0; type < TOMOYO_MAX_SINGLE_PATH_OPERATION; type++) { | |
833 | if (strcmp(data, tomoyo_sp_keyword[type])) | |
834 | continue; | |
835 | return tomoyo_update_single_path_acl(type, filename, | |
836 | domain, is_delete); | |
837 | } | |
838 | filename2 = strchr(filename, ' '); | |
839 | if (!filename2) | |
840 | goto out; | |
841 | *filename2++ = '\0'; | |
842 | for (type = 0; type < TOMOYO_MAX_DOUBLE_PATH_OPERATION; type++) { | |
843 | if (strcmp(data, tomoyo_dp_keyword[type])) | |
844 | continue; | |
845 | return tomoyo_update_double_path_acl(type, filename, filename2, | |
846 | domain, is_delete); | |
847 | } | |
848 | out: | |
849 | return -EINVAL; | |
850 | } | |
851 | ||
852 | /** | |
853 | * tomoyo_update_single_path_acl - Update "struct tomoyo_single_path_acl_record" list. | |
854 | * | |
855 | * @type: Type of operation. | |
856 | * @filename: Filename. | |
857 | * @domain: Pointer to "struct tomoyo_domain_info". | |
858 | * @is_delete: True if it is a delete request. | |
859 | * | |
860 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
861 | * |
862 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
863 | */ |
864 | static int tomoyo_update_single_path_acl(const u8 type, const char *filename, | |
865 | struct tomoyo_domain_info * | |
866 | const domain, const bool is_delete) | |
867 | { | |
937bf613 | 868 | static const u32 rw_mask = |
b69a54ee KT |
869 | (1 << TOMOYO_TYPE_READ_ACL) | (1 << TOMOYO_TYPE_WRITE_ACL); |
870 | const struct tomoyo_path_info *saved_filename; | |
871 | struct tomoyo_acl_info *ptr; | |
872 | struct tomoyo_single_path_acl_record *acl; | |
873 | int error = -ENOMEM; | |
937bf613 | 874 | const u32 perm = 1 << type; |
b69a54ee KT |
875 | |
876 | if (!domain) | |
877 | return -EINVAL; | |
878 | if (!tomoyo_is_correct_path(filename, 0, 0, 0, __func__)) | |
879 | return -EINVAL; | |
880 | saved_filename = tomoyo_save_name(filename); | |
881 | if (!saved_filename) | |
882 | return -ENOMEM; | |
f737d95d | 883 | mutex_lock(&tomoyo_policy_lock); |
b69a54ee KT |
884 | if (is_delete) |
885 | goto delete; | |
fdb8ebb7 | 886 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
ea13ddba | 887 | if (ptr->type != TOMOYO_TYPE_SINGLE_PATH_ACL) |
b69a54ee KT |
888 | continue; |
889 | acl = container_of(ptr, struct tomoyo_single_path_acl_record, | |
890 | head); | |
891 | if (acl->filename != saved_filename) | |
892 | continue; | |
937bf613 TH |
893 | if (perm <= 0xFFFF) |
894 | acl->perm |= perm; | |
895 | else | |
896 | acl->perm_high |= (perm >> 16); | |
b69a54ee KT |
897 | if ((acl->perm & rw_mask) == rw_mask) |
898 | acl->perm |= 1 << TOMOYO_TYPE_READ_WRITE_ACL; | |
899 | else if (acl->perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL)) | |
900 | acl->perm |= rw_mask; | |
b69a54ee KT |
901 | error = 0; |
902 | goto out; | |
903 | } | |
904 | /* Not found. Append it to the tail. */ | |
cd7bec6a TH |
905 | acl = kmalloc(sizeof(*acl), GFP_KERNEL); |
906 | if (!tomoyo_memory_ok(acl)) { | |
907 | kfree(acl); | |
908 | acl = NULL; | |
b69a54ee | 909 | goto out; |
cd7bec6a TH |
910 | } |
911 | acl->head.type = TOMOYO_TYPE_SINGLE_PATH_ACL; | |
937bf613 TH |
912 | if (perm <= 0xFFFF) |
913 | acl->perm = perm; | |
914 | else | |
915 | acl->perm_high = (perm >> 16); | |
b69a54ee KT |
916 | if (perm == (1 << TOMOYO_TYPE_READ_WRITE_ACL)) |
917 | acl->perm |= rw_mask; | |
918 | acl->filename = saved_filename; | |
fdb8ebb7 | 919 | list_add_tail_rcu(&acl->head.list, &domain->acl_info_list); |
b69a54ee KT |
920 | error = 0; |
921 | goto out; | |
922 | delete: | |
923 | error = -ENOENT; | |
fdb8ebb7 | 924 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
ea13ddba | 925 | if (ptr->type != TOMOYO_TYPE_SINGLE_PATH_ACL) |
b69a54ee KT |
926 | continue; |
927 | acl = container_of(ptr, struct tomoyo_single_path_acl_record, | |
928 | head); | |
929 | if (acl->filename != saved_filename) | |
930 | continue; | |
937bf613 TH |
931 | if (perm <= 0xFFFF) |
932 | acl->perm &= ~perm; | |
933 | else | |
934 | acl->perm_high &= ~(perm >> 16); | |
b69a54ee KT |
935 | if ((acl->perm & rw_mask) != rw_mask) |
936 | acl->perm &= ~(1 << TOMOYO_TYPE_READ_WRITE_ACL); | |
937 | else if (!(acl->perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL))) | |
938 | acl->perm &= ~rw_mask; | |
b69a54ee KT |
939 | error = 0; |
940 | break; | |
941 | } | |
942 | out: | |
f737d95d | 943 | mutex_unlock(&tomoyo_policy_lock); |
b69a54ee KT |
944 | return error; |
945 | } | |
946 | ||
947 | /** | |
948 | * tomoyo_update_double_path_acl - Update "struct tomoyo_double_path_acl_record" list. | |
949 | * | |
950 | * @type: Type of operation. | |
951 | * @filename1: First filename. | |
952 | * @filename2: Second filename. | |
953 | * @domain: Pointer to "struct tomoyo_domain_info". | |
954 | * @is_delete: True if it is a delete request. | |
955 | * | |
956 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
957 | * |
958 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
959 | */ |
960 | static int tomoyo_update_double_path_acl(const u8 type, const char *filename1, | |
961 | const char *filename2, | |
962 | struct tomoyo_domain_info * | |
963 | const domain, const bool is_delete) | |
964 | { | |
965 | const struct tomoyo_path_info *saved_filename1; | |
966 | const struct tomoyo_path_info *saved_filename2; | |
967 | struct tomoyo_acl_info *ptr; | |
968 | struct tomoyo_double_path_acl_record *acl; | |
969 | int error = -ENOMEM; | |
970 | const u8 perm = 1 << type; | |
971 | ||
972 | if (!domain) | |
973 | return -EINVAL; | |
974 | if (!tomoyo_is_correct_path(filename1, 0, 0, 0, __func__) || | |
975 | !tomoyo_is_correct_path(filename2, 0, 0, 0, __func__)) | |
976 | return -EINVAL; | |
977 | saved_filename1 = tomoyo_save_name(filename1); | |
978 | saved_filename2 = tomoyo_save_name(filename2); | |
979 | if (!saved_filename1 || !saved_filename2) | |
980 | return -ENOMEM; | |
f737d95d | 981 | mutex_lock(&tomoyo_policy_lock); |
b69a54ee KT |
982 | if (is_delete) |
983 | goto delete; | |
fdb8ebb7 | 984 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
ea13ddba | 985 | if (ptr->type != TOMOYO_TYPE_DOUBLE_PATH_ACL) |
b69a54ee KT |
986 | continue; |
987 | acl = container_of(ptr, struct tomoyo_double_path_acl_record, | |
988 | head); | |
989 | if (acl->filename1 != saved_filename1 || | |
990 | acl->filename2 != saved_filename2) | |
991 | continue; | |
b69a54ee | 992 | acl->perm |= perm; |
b69a54ee KT |
993 | error = 0; |
994 | goto out; | |
995 | } | |
996 | /* Not found. Append it to the tail. */ | |
cd7bec6a TH |
997 | acl = kmalloc(sizeof(*acl), GFP_KERNEL); |
998 | if (!tomoyo_memory_ok(acl)) { | |
999 | kfree(acl); | |
1000 | acl = NULL; | |
b69a54ee | 1001 | goto out; |
cd7bec6a TH |
1002 | } |
1003 | acl->head.type = TOMOYO_TYPE_DOUBLE_PATH_ACL; | |
b69a54ee KT |
1004 | acl->perm = perm; |
1005 | acl->filename1 = saved_filename1; | |
1006 | acl->filename2 = saved_filename2; | |
fdb8ebb7 | 1007 | list_add_tail_rcu(&acl->head.list, &domain->acl_info_list); |
b69a54ee KT |
1008 | error = 0; |
1009 | goto out; | |
1010 | delete: | |
1011 | error = -ENOENT; | |
fdb8ebb7 | 1012 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
ea13ddba | 1013 | if (ptr->type != TOMOYO_TYPE_DOUBLE_PATH_ACL) |
b69a54ee KT |
1014 | continue; |
1015 | acl = container_of(ptr, struct tomoyo_double_path_acl_record, | |
1016 | head); | |
1017 | if (acl->filename1 != saved_filename1 || | |
1018 | acl->filename2 != saved_filename2) | |
1019 | continue; | |
1020 | acl->perm &= ~perm; | |
b69a54ee KT |
1021 | error = 0; |
1022 | break; | |
1023 | } | |
1024 | out: | |
f737d95d | 1025 | mutex_unlock(&tomoyo_policy_lock); |
b69a54ee KT |
1026 | return error; |
1027 | } | |
1028 | ||
1029 | /** | |
1030 | * tomoyo_check_single_path_acl - Check permission for single path operation. | |
1031 | * | |
1032 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1033 | * @type: Type of operation. | |
1034 | * @filename: Filename to check. | |
1035 | * | |
1036 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1037 | * |
1038 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
1039 | */ |
1040 | static int tomoyo_check_single_path_acl(struct tomoyo_domain_info *domain, | |
1041 | const u8 type, | |
1042 | const struct tomoyo_path_info *filename) | |
1043 | { | |
1044 | if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) | |
1045 | return 0; | |
1046 | return tomoyo_check_single_path_acl2(domain, filename, 1 << type, 1); | |
1047 | } | |
1048 | ||
1049 | /** | |
1050 | * tomoyo_check_double_path_acl - Check permission for double path operation. | |
1051 | * | |
1052 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1053 | * @type: Type of operation. | |
1054 | * @filename1: First filename to check. | |
1055 | * @filename2: Second filename to check. | |
1056 | * | |
1057 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
1058 | * |
1059 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
1060 | */ |
1061 | static int tomoyo_check_double_path_acl(const struct tomoyo_domain_info *domain, | |
1062 | const u8 type, | |
1063 | const struct tomoyo_path_info * | |
1064 | filename1, | |
1065 | const struct tomoyo_path_info * | |
1066 | filename2) | |
1067 | { | |
1068 | struct tomoyo_acl_info *ptr; | |
1069 | const u8 perm = 1 << type; | |
1070 | int error = -EPERM; | |
1071 | ||
1072 | if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) | |
1073 | return 0; | |
fdb8ebb7 | 1074 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
b69a54ee | 1075 | struct tomoyo_double_path_acl_record *acl; |
ea13ddba | 1076 | if (ptr->type != TOMOYO_TYPE_DOUBLE_PATH_ACL) |
b69a54ee KT |
1077 | continue; |
1078 | acl = container_of(ptr, struct tomoyo_double_path_acl_record, | |
1079 | head); | |
1080 | if (!(acl->perm & perm)) | |
1081 | continue; | |
1082 | if (!tomoyo_path_matches_pattern(filename1, acl->filename1)) | |
1083 | continue; | |
1084 | if (!tomoyo_path_matches_pattern(filename2, acl->filename2)) | |
1085 | continue; | |
1086 | error = 0; | |
1087 | break; | |
1088 | } | |
b69a54ee KT |
1089 | return error; |
1090 | } | |
1091 | ||
1092 | /** | |
1093 | * tomoyo_check_single_path_permission2 - Check permission for single path operation. | |
1094 | * | |
1095 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1096 | * @operation: Type of operation. | |
1097 | * @filename: Filename to check. | |
1098 | * @mode: Access control mode. | |
1099 | * | |
1100 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1101 | * |
1102 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
1103 | */ |
1104 | static int tomoyo_check_single_path_permission2(struct tomoyo_domain_info * | |
1105 | const domain, u8 operation, | |
1106 | const struct tomoyo_path_info * | |
1107 | filename, const u8 mode) | |
1108 | { | |
1109 | const char *msg; | |
1110 | int error; | |
1111 | const bool is_enforce = (mode == 3); | |
1112 | ||
1113 | if (!mode) | |
1114 | return 0; | |
1115 | next: | |
1116 | error = tomoyo_check_single_path_acl(domain, operation, filename); | |
1117 | msg = tomoyo_sp2keyword(operation); | |
1118 | if (!error) | |
1119 | goto ok; | |
1120 | if (tomoyo_verbose_mode(domain)) | |
1121 | printk(KERN_WARNING "TOMOYO-%s: Access '%s %s' denied for %s\n", | |
1122 | tomoyo_get_msg(is_enforce), msg, filename->name, | |
1123 | tomoyo_get_last_name(domain)); | |
1124 | if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { | |
1125 | const char *name = tomoyo_get_file_pattern(filename)->name; | |
1126 | tomoyo_update_single_path_acl(operation, name, domain, false); | |
1127 | } | |
1128 | if (!is_enforce) | |
1129 | error = 0; | |
1130 | ok: | |
1131 | /* | |
1132 | * Since "allow_truncate" doesn't imply "allow_rewrite" permission, | |
1133 | * we need to check "allow_rewrite" permission if the filename is | |
1134 | * specified by "deny_rewrite" keyword. | |
1135 | */ | |
1136 | if (!error && operation == TOMOYO_TYPE_TRUNCATE_ACL && | |
1137 | tomoyo_is_no_rewrite_file(filename)) { | |
1138 | operation = TOMOYO_TYPE_REWRITE_ACL; | |
1139 | goto next; | |
1140 | } | |
1141 | return error; | |
1142 | } | |
1143 | ||
b69a54ee KT |
1144 | /** |
1145 | * tomoyo_check_exec_perm - Check permission for "execute". | |
1146 | * | |
1147 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1148 | * @filename: Check permission for "execute". | |
b69a54ee KT |
1149 | * |
1150 | * Returns 0 on success, negativevalue otherwise. | |
fdb8ebb7 TH |
1151 | * |
1152 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
1153 | */ |
1154 | int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain, | |
bcb86975 | 1155 | const struct tomoyo_path_info *filename) |
b69a54ee KT |
1156 | { |
1157 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1158 | ||
1159 | if (!mode) | |
1160 | return 0; | |
1161 | return tomoyo_check_file_perm2(domain, filename, 1, "do_execve", mode); | |
1162 | } | |
1163 | ||
1164 | /** | |
1165 | * tomoyo_check_open_permission - Check permission for "read" and "write". | |
1166 | * | |
1167 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1168 | * @path: Pointer to "struct path". | |
1169 | * @flag: Flags for open(). | |
1170 | * | |
1171 | * Returns 0 on success, negative value otherwise. | |
1172 | */ | |
1173 | int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, | |
1174 | struct path *path, const int flag) | |
1175 | { | |
1176 | const u8 acc_mode = ACC_MODE(flag); | |
1177 | int error = -ENOMEM; | |
1178 | struct tomoyo_path_info *buf; | |
1179 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1180 | const bool is_enforce = (mode == 3); | |
fdb8ebb7 | 1181 | int idx; |
b69a54ee KT |
1182 | |
1183 | if (!mode || !path->mnt) | |
1184 | return 0; | |
1185 | if (acc_mode == 0) | |
1186 | return 0; | |
1187 | if (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode)) | |
1188 | /* | |
1189 | * I don't check directories here because mkdir() and rmdir() | |
1190 | * don't call me. | |
1191 | */ | |
1192 | return 0; | |
fdb8ebb7 | 1193 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1194 | buf = tomoyo_get_path(path); |
1195 | if (!buf) | |
1196 | goto out; | |
1197 | error = 0; | |
1198 | /* | |
1199 | * If the filename is specified by "deny_rewrite" keyword, | |
1200 | * we need to check "allow_rewrite" permission when the filename is not | |
1201 | * opened for append mode or the filename is truncated at open time. | |
1202 | */ | |
1203 | if ((acc_mode & MAY_WRITE) && | |
1204 | ((flag & O_TRUNC) || !(flag & O_APPEND)) && | |
1205 | (tomoyo_is_no_rewrite_file(buf))) { | |
1206 | error = tomoyo_check_single_path_permission2(domain, | |
1207 | TOMOYO_TYPE_REWRITE_ACL, | |
1208 | buf, mode); | |
1209 | } | |
1210 | if (!error) | |
1211 | error = tomoyo_check_file_perm2(domain, buf, acc_mode, "open", | |
1212 | mode); | |
1213 | if (!error && (flag & O_TRUNC)) | |
1214 | error = tomoyo_check_single_path_permission2(domain, | |
1215 | TOMOYO_TYPE_TRUNCATE_ACL, | |
1216 | buf, mode); | |
1217 | out: | |
8e2d39a1 | 1218 | kfree(buf); |
fdb8ebb7 | 1219 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1220 | if (!is_enforce) |
1221 | error = 0; | |
1222 | return error; | |
1223 | } | |
1224 | ||
1225 | /** | |
937bf613 | 1226 | * 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 |
1227 | * |
1228 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1229 | * @operation: Type of operation. | |
1230 | * @path: Pointer to "struct path". | |
1231 | * | |
1232 | * Returns 0 on success, negative value otherwise. | |
1233 | */ | |
1234 | int tomoyo_check_1path_perm(struct tomoyo_domain_info *domain, | |
1235 | const u8 operation, struct path *path) | |
1236 | { | |
1237 | int error = -ENOMEM; | |
1238 | struct tomoyo_path_info *buf; | |
1239 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1240 | const bool is_enforce = (mode == 3); | |
fdb8ebb7 | 1241 | int idx; |
b69a54ee KT |
1242 | |
1243 | if (!mode || !path->mnt) | |
1244 | return 0; | |
fdb8ebb7 | 1245 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1246 | buf = tomoyo_get_path(path); |
1247 | if (!buf) | |
1248 | goto out; | |
1249 | switch (operation) { | |
1250 | case TOMOYO_TYPE_MKDIR_ACL: | |
1251 | case TOMOYO_TYPE_RMDIR_ACL: | |
937bf613 | 1252 | case TOMOYO_TYPE_CHROOT_ACL: |
b69a54ee KT |
1253 | if (!buf->is_dir) { |
1254 | /* | |
1255 | * tomoyo_get_path() reserves space for appending "/." | |
1256 | */ | |
1257 | strcat((char *) buf->name, "/"); | |
1258 | tomoyo_fill_path_info(buf); | |
1259 | } | |
1260 | } | |
1261 | error = tomoyo_check_single_path_permission2(domain, operation, buf, | |
1262 | mode); | |
1263 | out: | |
8e2d39a1 | 1264 | kfree(buf); |
fdb8ebb7 | 1265 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1266 | if (!is_enforce) |
1267 | error = 0; | |
1268 | return error; | |
1269 | } | |
1270 | ||
1271 | /** | |
1272 | * tomoyo_check_rewrite_permission - Check permission for "rewrite". | |
1273 | * | |
1274 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1275 | * @filp: Pointer to "struct file". | |
1276 | * | |
1277 | * Returns 0 on success, negative value otherwise. | |
1278 | */ | |
1279 | int tomoyo_check_rewrite_permission(struct tomoyo_domain_info *domain, | |
1280 | struct file *filp) | |
1281 | { | |
1282 | int error = -ENOMEM; | |
1283 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1284 | const bool is_enforce = (mode == 3); | |
1285 | struct tomoyo_path_info *buf; | |
fdb8ebb7 | 1286 | int idx; |
b69a54ee KT |
1287 | |
1288 | if (!mode || !filp->f_path.mnt) | |
1289 | return 0; | |
fdb8ebb7 TH |
1290 | |
1291 | idx = tomoyo_read_lock(); | |
b69a54ee KT |
1292 | buf = tomoyo_get_path(&filp->f_path); |
1293 | if (!buf) | |
1294 | goto out; | |
1295 | if (!tomoyo_is_no_rewrite_file(buf)) { | |
1296 | error = 0; | |
1297 | goto out; | |
1298 | } | |
1299 | error = tomoyo_check_single_path_permission2(domain, | |
1300 | TOMOYO_TYPE_REWRITE_ACL, | |
1301 | buf, mode); | |
1302 | out: | |
8e2d39a1 | 1303 | kfree(buf); |
fdb8ebb7 | 1304 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1305 | if (!is_enforce) |
1306 | error = 0; | |
1307 | return error; | |
1308 | } | |
1309 | ||
1310 | /** | |
937bf613 | 1311 | * tomoyo_check_2path_perm - Check permission for "rename", "link" and "pivot_root". |
b69a54ee KT |
1312 | * |
1313 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1314 | * @operation: Type of operation. | |
1315 | * @path1: Pointer to "struct path". | |
1316 | * @path2: Pointer to "struct path". | |
1317 | * | |
1318 | * Returns 0 on success, negative value otherwise. | |
1319 | */ | |
1320 | int tomoyo_check_2path_perm(struct tomoyo_domain_info * const domain, | |
1321 | const u8 operation, struct path *path1, | |
1322 | struct path *path2) | |
1323 | { | |
1324 | int error = -ENOMEM; | |
1325 | struct tomoyo_path_info *buf1, *buf2; | |
1326 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1327 | const bool is_enforce = (mode == 3); | |
1328 | const char *msg; | |
fdb8ebb7 | 1329 | int idx; |
b69a54ee KT |
1330 | |
1331 | if (!mode || !path1->mnt || !path2->mnt) | |
1332 | return 0; | |
fdb8ebb7 | 1333 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1334 | buf1 = tomoyo_get_path(path1); |
1335 | buf2 = tomoyo_get_path(path2); | |
1336 | if (!buf1 || !buf2) | |
1337 | goto out; | |
1338 | { | |
1339 | struct dentry *dentry = path1->dentry; | |
1340 | if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) { | |
1341 | /* | |
1342 | * tomoyo_get_path() reserves space for appending "/." | |
1343 | */ | |
1344 | if (!buf1->is_dir) { | |
1345 | strcat((char *) buf1->name, "/"); | |
1346 | tomoyo_fill_path_info(buf1); | |
1347 | } | |
1348 | if (!buf2->is_dir) { | |
1349 | strcat((char *) buf2->name, "/"); | |
1350 | tomoyo_fill_path_info(buf2); | |
1351 | } | |
1352 | } | |
1353 | } | |
1354 | error = tomoyo_check_double_path_acl(domain, operation, buf1, buf2); | |
1355 | msg = tomoyo_dp2keyword(operation); | |
1356 | if (!error) | |
1357 | goto out; | |
1358 | if (tomoyo_verbose_mode(domain)) | |
1359 | printk(KERN_WARNING "TOMOYO-%s: Access '%s %s %s' " | |
1360 | "denied for %s\n", tomoyo_get_msg(is_enforce), | |
1361 | msg, buf1->name, buf2->name, | |
1362 | tomoyo_get_last_name(domain)); | |
1363 | if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { | |
1364 | const char *name1 = tomoyo_get_file_pattern(buf1)->name; | |
1365 | const char *name2 = tomoyo_get_file_pattern(buf2)->name; | |
1366 | tomoyo_update_double_path_acl(operation, name1, name2, domain, | |
1367 | false); | |
1368 | } | |
1369 | out: | |
8e2d39a1 TH |
1370 | kfree(buf1); |
1371 | kfree(buf2); | |
fdb8ebb7 | 1372 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1373 | if (!is_enforce) |
1374 | error = 0; | |
1375 | return error; | |
1376 | } |