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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" | |
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 | ||
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 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; | |
f737d95d | 884 | mutex_lock(&tomoyo_policy_lock); |
b69a54ee KT |
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. */ | |
cd7bec6a TH |
910 | acl = kmalloc(sizeof(*acl), GFP_KERNEL); |
911 | if (!tomoyo_memory_ok(acl)) { | |
912 | kfree(acl); | |
913 | acl = NULL; | |
b69a54ee | 914 | goto out; |
cd7bec6a TH |
915 | } |
916 | acl->head.type = TOMOYO_TYPE_SINGLE_PATH_ACL; | |
937bf613 TH |
917 | if (perm <= 0xFFFF) |
918 | acl->perm = perm; | |
919 | else | |
920 | acl->perm_high = (perm >> 16); | |
b69a54ee KT |
921 | if (perm == (1 << TOMOYO_TYPE_READ_WRITE_ACL)) |
922 | acl->perm |= rw_mask; | |
923 | acl->filename = saved_filename; | |
fdb8ebb7 | 924 | list_add_tail_rcu(&acl->head.list, &domain->acl_info_list); |
b69a54ee KT |
925 | error = 0; |
926 | goto out; | |
927 | delete: | |
928 | error = -ENOENT; | |
fdb8ebb7 | 929 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
b69a54ee KT |
930 | if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_SINGLE_PATH_ACL) |
931 | continue; | |
932 | acl = container_of(ptr, struct tomoyo_single_path_acl_record, | |
933 | head); | |
934 | if (acl->filename != saved_filename) | |
935 | continue; | |
937bf613 TH |
936 | if (perm <= 0xFFFF) |
937 | acl->perm &= ~perm; | |
938 | else | |
939 | acl->perm_high &= ~(perm >> 16); | |
b69a54ee KT |
940 | if ((acl->perm & rw_mask) != rw_mask) |
941 | acl->perm &= ~(1 << TOMOYO_TYPE_READ_WRITE_ACL); | |
942 | else if (!(acl->perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL))) | |
943 | acl->perm &= ~rw_mask; | |
937bf613 | 944 | if (!acl->perm && !acl->perm_high) |
b69a54ee KT |
945 | ptr->type |= TOMOYO_ACL_DELETED; |
946 | error = 0; | |
947 | break; | |
948 | } | |
949 | out: | |
f737d95d | 950 | mutex_unlock(&tomoyo_policy_lock); |
b69a54ee KT |
951 | return error; |
952 | } | |
953 | ||
954 | /** | |
955 | * tomoyo_update_double_path_acl - Update "struct tomoyo_double_path_acl_record" list. | |
956 | * | |
957 | * @type: Type of operation. | |
958 | * @filename1: First filename. | |
959 | * @filename2: Second filename. | |
960 | * @domain: Pointer to "struct tomoyo_domain_info". | |
961 | * @is_delete: True if it is a delete request. | |
962 | * | |
963 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
964 | * |
965 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
966 | */ |
967 | static int tomoyo_update_double_path_acl(const u8 type, const char *filename1, | |
968 | const char *filename2, | |
969 | struct tomoyo_domain_info * | |
970 | const domain, const bool is_delete) | |
971 | { | |
972 | const struct tomoyo_path_info *saved_filename1; | |
973 | const struct tomoyo_path_info *saved_filename2; | |
974 | struct tomoyo_acl_info *ptr; | |
975 | struct tomoyo_double_path_acl_record *acl; | |
976 | int error = -ENOMEM; | |
977 | const u8 perm = 1 << type; | |
978 | ||
979 | if (!domain) | |
980 | return -EINVAL; | |
981 | if (!tomoyo_is_correct_path(filename1, 0, 0, 0, __func__) || | |
982 | !tomoyo_is_correct_path(filename2, 0, 0, 0, __func__)) | |
983 | return -EINVAL; | |
984 | saved_filename1 = tomoyo_save_name(filename1); | |
985 | saved_filename2 = tomoyo_save_name(filename2); | |
986 | if (!saved_filename1 || !saved_filename2) | |
987 | return -ENOMEM; | |
f737d95d | 988 | mutex_lock(&tomoyo_policy_lock); |
b69a54ee KT |
989 | if (is_delete) |
990 | goto delete; | |
fdb8ebb7 | 991 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
b69a54ee KT |
992 | if (tomoyo_acl_type1(ptr) != TOMOYO_TYPE_DOUBLE_PATH_ACL) |
993 | continue; | |
994 | acl = container_of(ptr, struct tomoyo_double_path_acl_record, | |
995 | head); | |
996 | if (acl->filename1 != saved_filename1 || | |
997 | acl->filename2 != saved_filename2) | |
998 | continue; | |
999 | /* Special case. Clear all bits if marked as deleted. */ | |
1000 | if (ptr->type & TOMOYO_ACL_DELETED) | |
1001 | acl->perm = 0; | |
1002 | acl->perm |= perm; | |
1003 | ptr->type &= ~TOMOYO_ACL_DELETED; | |
1004 | error = 0; | |
1005 | goto out; | |
1006 | } | |
1007 | /* Not found. Append it to the tail. */ | |
cd7bec6a TH |
1008 | acl = kmalloc(sizeof(*acl), GFP_KERNEL); |
1009 | if (!tomoyo_memory_ok(acl)) { | |
1010 | kfree(acl); | |
1011 | acl = NULL; | |
b69a54ee | 1012 | goto out; |
cd7bec6a TH |
1013 | } |
1014 | acl->head.type = TOMOYO_TYPE_DOUBLE_PATH_ACL; | |
b69a54ee KT |
1015 | acl->perm = perm; |
1016 | acl->filename1 = saved_filename1; | |
1017 | acl->filename2 = saved_filename2; | |
fdb8ebb7 | 1018 | list_add_tail_rcu(&acl->head.list, &domain->acl_info_list); |
b69a54ee KT |
1019 | error = 0; |
1020 | goto out; | |
1021 | delete: | |
1022 | error = -ENOENT; | |
fdb8ebb7 | 1023 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
b69a54ee KT |
1024 | if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_DOUBLE_PATH_ACL) |
1025 | continue; | |
1026 | acl = container_of(ptr, struct tomoyo_double_path_acl_record, | |
1027 | head); | |
1028 | if (acl->filename1 != saved_filename1 || | |
1029 | acl->filename2 != saved_filename2) | |
1030 | continue; | |
1031 | acl->perm &= ~perm; | |
1032 | if (!acl->perm) | |
1033 | ptr->type |= TOMOYO_ACL_DELETED; | |
1034 | error = 0; | |
1035 | break; | |
1036 | } | |
1037 | out: | |
f737d95d | 1038 | mutex_unlock(&tomoyo_policy_lock); |
b69a54ee KT |
1039 | return error; |
1040 | } | |
1041 | ||
1042 | /** | |
1043 | * tomoyo_check_single_path_acl - Check permission for single path operation. | |
1044 | * | |
1045 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1046 | * @type: Type of operation. | |
1047 | * @filename: Filename to check. | |
1048 | * | |
1049 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1050 | * |
1051 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
1052 | */ |
1053 | static int tomoyo_check_single_path_acl(struct tomoyo_domain_info *domain, | |
1054 | const u8 type, | |
1055 | const struct tomoyo_path_info *filename) | |
1056 | { | |
1057 | if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) | |
1058 | return 0; | |
1059 | return tomoyo_check_single_path_acl2(domain, filename, 1 << type, 1); | |
1060 | } | |
1061 | ||
1062 | /** | |
1063 | * tomoyo_check_double_path_acl - Check permission for double path operation. | |
1064 | * | |
1065 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1066 | * @type: Type of operation. | |
1067 | * @filename1: First filename to check. | |
1068 | * @filename2: Second filename to check. | |
1069 | * | |
1070 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
1071 | * |
1072 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
1073 | */ |
1074 | static int tomoyo_check_double_path_acl(const struct tomoyo_domain_info *domain, | |
1075 | const u8 type, | |
1076 | const struct tomoyo_path_info * | |
1077 | filename1, | |
1078 | const struct tomoyo_path_info * | |
1079 | filename2) | |
1080 | { | |
1081 | struct tomoyo_acl_info *ptr; | |
1082 | const u8 perm = 1 << type; | |
1083 | int error = -EPERM; | |
1084 | ||
1085 | if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) | |
1086 | return 0; | |
fdb8ebb7 | 1087 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
b69a54ee KT |
1088 | struct tomoyo_double_path_acl_record *acl; |
1089 | if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_DOUBLE_PATH_ACL) | |
1090 | continue; | |
1091 | acl = container_of(ptr, struct tomoyo_double_path_acl_record, | |
1092 | head); | |
1093 | if (!(acl->perm & perm)) | |
1094 | continue; | |
1095 | if (!tomoyo_path_matches_pattern(filename1, acl->filename1)) | |
1096 | continue; | |
1097 | if (!tomoyo_path_matches_pattern(filename2, acl->filename2)) | |
1098 | continue; | |
1099 | error = 0; | |
1100 | break; | |
1101 | } | |
b69a54ee KT |
1102 | return error; |
1103 | } | |
1104 | ||
1105 | /** | |
1106 | * tomoyo_check_single_path_permission2 - Check permission for single path operation. | |
1107 | * | |
1108 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1109 | * @operation: Type of operation. | |
1110 | * @filename: Filename to check. | |
1111 | * @mode: Access control mode. | |
1112 | * | |
1113 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1114 | * |
1115 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
1116 | */ |
1117 | static int tomoyo_check_single_path_permission2(struct tomoyo_domain_info * | |
1118 | const domain, u8 operation, | |
1119 | const struct tomoyo_path_info * | |
1120 | filename, const u8 mode) | |
1121 | { | |
1122 | const char *msg; | |
1123 | int error; | |
1124 | const bool is_enforce = (mode == 3); | |
1125 | ||
1126 | if (!mode) | |
1127 | return 0; | |
1128 | next: | |
1129 | error = tomoyo_check_single_path_acl(domain, operation, filename); | |
1130 | msg = tomoyo_sp2keyword(operation); | |
1131 | if (!error) | |
1132 | goto ok; | |
1133 | if (tomoyo_verbose_mode(domain)) | |
1134 | printk(KERN_WARNING "TOMOYO-%s: Access '%s %s' denied for %s\n", | |
1135 | tomoyo_get_msg(is_enforce), msg, filename->name, | |
1136 | tomoyo_get_last_name(domain)); | |
1137 | if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { | |
1138 | const char *name = tomoyo_get_file_pattern(filename)->name; | |
1139 | tomoyo_update_single_path_acl(operation, name, domain, false); | |
1140 | } | |
1141 | if (!is_enforce) | |
1142 | error = 0; | |
1143 | ok: | |
1144 | /* | |
1145 | * Since "allow_truncate" doesn't imply "allow_rewrite" permission, | |
1146 | * we need to check "allow_rewrite" permission if the filename is | |
1147 | * specified by "deny_rewrite" keyword. | |
1148 | */ | |
1149 | if (!error && operation == TOMOYO_TYPE_TRUNCATE_ACL && | |
1150 | tomoyo_is_no_rewrite_file(filename)) { | |
1151 | operation = TOMOYO_TYPE_REWRITE_ACL; | |
1152 | goto next; | |
1153 | } | |
1154 | return error; | |
1155 | } | |
1156 | ||
b69a54ee KT |
1157 | /** |
1158 | * tomoyo_check_exec_perm - Check permission for "execute". | |
1159 | * | |
1160 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1161 | * @filename: Check permission for "execute". | |
b69a54ee KT |
1162 | * |
1163 | * Returns 0 on success, negativevalue otherwise. | |
fdb8ebb7 TH |
1164 | * |
1165 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
1166 | */ |
1167 | int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain, | |
bcb86975 | 1168 | const struct tomoyo_path_info *filename) |
b69a54ee KT |
1169 | { |
1170 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1171 | ||
1172 | if (!mode) | |
1173 | return 0; | |
1174 | return tomoyo_check_file_perm2(domain, filename, 1, "do_execve", mode); | |
1175 | } | |
1176 | ||
1177 | /** | |
1178 | * tomoyo_check_open_permission - Check permission for "read" and "write". | |
1179 | * | |
1180 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1181 | * @path: Pointer to "struct path". | |
1182 | * @flag: Flags for open(). | |
1183 | * | |
1184 | * Returns 0 on success, negative value otherwise. | |
1185 | */ | |
1186 | int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, | |
1187 | struct path *path, const int flag) | |
1188 | { | |
1189 | const u8 acc_mode = ACC_MODE(flag); | |
1190 | int error = -ENOMEM; | |
1191 | struct tomoyo_path_info *buf; | |
1192 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1193 | const bool is_enforce = (mode == 3); | |
fdb8ebb7 | 1194 | int idx; |
b69a54ee KT |
1195 | |
1196 | if (!mode || !path->mnt) | |
1197 | return 0; | |
1198 | if (acc_mode == 0) | |
1199 | return 0; | |
1200 | if (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode)) | |
1201 | /* | |
1202 | * I don't check directories here because mkdir() and rmdir() | |
1203 | * don't call me. | |
1204 | */ | |
1205 | return 0; | |
fdb8ebb7 | 1206 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1207 | buf = tomoyo_get_path(path); |
1208 | if (!buf) | |
1209 | goto out; | |
1210 | error = 0; | |
1211 | /* | |
1212 | * If the filename is specified by "deny_rewrite" keyword, | |
1213 | * we need to check "allow_rewrite" permission when the filename is not | |
1214 | * opened for append mode or the filename is truncated at open time. | |
1215 | */ | |
1216 | if ((acc_mode & MAY_WRITE) && | |
1217 | ((flag & O_TRUNC) || !(flag & O_APPEND)) && | |
1218 | (tomoyo_is_no_rewrite_file(buf))) { | |
1219 | error = tomoyo_check_single_path_permission2(domain, | |
1220 | TOMOYO_TYPE_REWRITE_ACL, | |
1221 | buf, mode); | |
1222 | } | |
1223 | if (!error) | |
1224 | error = tomoyo_check_file_perm2(domain, buf, acc_mode, "open", | |
1225 | mode); | |
1226 | if (!error && (flag & O_TRUNC)) | |
1227 | error = tomoyo_check_single_path_permission2(domain, | |
1228 | TOMOYO_TYPE_TRUNCATE_ACL, | |
1229 | buf, mode); | |
1230 | out: | |
1231 | tomoyo_free(buf); | |
fdb8ebb7 | 1232 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1233 | if (!is_enforce) |
1234 | error = 0; | |
1235 | return error; | |
1236 | } | |
1237 | ||
1238 | /** | |
937bf613 | 1239 | * 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 |
1240 | * |
1241 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1242 | * @operation: Type of operation. | |
1243 | * @path: Pointer to "struct path". | |
1244 | * | |
1245 | * Returns 0 on success, negative value otherwise. | |
1246 | */ | |
1247 | int tomoyo_check_1path_perm(struct tomoyo_domain_info *domain, | |
1248 | const u8 operation, struct path *path) | |
1249 | { | |
1250 | int error = -ENOMEM; | |
1251 | struct tomoyo_path_info *buf; | |
1252 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1253 | const bool is_enforce = (mode == 3); | |
fdb8ebb7 | 1254 | int idx; |
b69a54ee KT |
1255 | |
1256 | if (!mode || !path->mnt) | |
1257 | return 0; | |
fdb8ebb7 | 1258 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1259 | buf = tomoyo_get_path(path); |
1260 | if (!buf) | |
1261 | goto out; | |
1262 | switch (operation) { | |
1263 | case TOMOYO_TYPE_MKDIR_ACL: | |
1264 | case TOMOYO_TYPE_RMDIR_ACL: | |
937bf613 | 1265 | case TOMOYO_TYPE_CHROOT_ACL: |
b69a54ee KT |
1266 | if (!buf->is_dir) { |
1267 | /* | |
1268 | * tomoyo_get_path() reserves space for appending "/." | |
1269 | */ | |
1270 | strcat((char *) buf->name, "/"); | |
1271 | tomoyo_fill_path_info(buf); | |
1272 | } | |
1273 | } | |
1274 | error = tomoyo_check_single_path_permission2(domain, operation, buf, | |
1275 | mode); | |
1276 | out: | |
1277 | tomoyo_free(buf); | |
fdb8ebb7 | 1278 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1279 | if (!is_enforce) |
1280 | error = 0; | |
1281 | return error; | |
1282 | } | |
1283 | ||
1284 | /** | |
1285 | * tomoyo_check_rewrite_permission - Check permission for "rewrite". | |
1286 | * | |
1287 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1288 | * @filp: Pointer to "struct file". | |
1289 | * | |
1290 | * Returns 0 on success, negative value otherwise. | |
1291 | */ | |
1292 | int tomoyo_check_rewrite_permission(struct tomoyo_domain_info *domain, | |
1293 | struct file *filp) | |
1294 | { | |
1295 | int error = -ENOMEM; | |
1296 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1297 | const bool is_enforce = (mode == 3); | |
1298 | struct tomoyo_path_info *buf; | |
fdb8ebb7 | 1299 | int idx; |
b69a54ee KT |
1300 | |
1301 | if (!mode || !filp->f_path.mnt) | |
1302 | return 0; | |
fdb8ebb7 TH |
1303 | |
1304 | idx = tomoyo_read_lock(); | |
b69a54ee KT |
1305 | buf = tomoyo_get_path(&filp->f_path); |
1306 | if (!buf) | |
1307 | goto out; | |
1308 | if (!tomoyo_is_no_rewrite_file(buf)) { | |
1309 | error = 0; | |
1310 | goto out; | |
1311 | } | |
1312 | error = tomoyo_check_single_path_permission2(domain, | |
1313 | TOMOYO_TYPE_REWRITE_ACL, | |
1314 | buf, mode); | |
1315 | out: | |
1316 | tomoyo_free(buf); | |
fdb8ebb7 | 1317 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1318 | if (!is_enforce) |
1319 | error = 0; | |
1320 | return error; | |
1321 | } | |
1322 | ||
1323 | /** | |
937bf613 | 1324 | * tomoyo_check_2path_perm - Check permission for "rename", "link" and "pivot_root". |
b69a54ee KT |
1325 | * |
1326 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1327 | * @operation: Type of operation. | |
1328 | * @path1: Pointer to "struct path". | |
1329 | * @path2: Pointer to "struct path". | |
1330 | * | |
1331 | * Returns 0 on success, negative value otherwise. | |
1332 | */ | |
1333 | int tomoyo_check_2path_perm(struct tomoyo_domain_info * const domain, | |
1334 | const u8 operation, struct path *path1, | |
1335 | struct path *path2) | |
1336 | { | |
1337 | int error = -ENOMEM; | |
1338 | struct tomoyo_path_info *buf1, *buf2; | |
1339 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1340 | const bool is_enforce = (mode == 3); | |
1341 | const char *msg; | |
fdb8ebb7 | 1342 | int idx; |
b69a54ee KT |
1343 | |
1344 | if (!mode || !path1->mnt || !path2->mnt) | |
1345 | return 0; | |
fdb8ebb7 | 1346 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1347 | buf1 = tomoyo_get_path(path1); |
1348 | buf2 = tomoyo_get_path(path2); | |
1349 | if (!buf1 || !buf2) | |
1350 | goto out; | |
1351 | { | |
1352 | struct dentry *dentry = path1->dentry; | |
1353 | if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) { | |
1354 | /* | |
1355 | * tomoyo_get_path() reserves space for appending "/." | |
1356 | */ | |
1357 | if (!buf1->is_dir) { | |
1358 | strcat((char *) buf1->name, "/"); | |
1359 | tomoyo_fill_path_info(buf1); | |
1360 | } | |
1361 | if (!buf2->is_dir) { | |
1362 | strcat((char *) buf2->name, "/"); | |
1363 | tomoyo_fill_path_info(buf2); | |
1364 | } | |
1365 | } | |
1366 | } | |
1367 | error = tomoyo_check_double_path_acl(domain, operation, buf1, buf2); | |
1368 | msg = tomoyo_dp2keyword(operation); | |
1369 | if (!error) | |
1370 | goto out; | |
1371 | if (tomoyo_verbose_mode(domain)) | |
1372 | printk(KERN_WARNING "TOMOYO-%s: Access '%s %s %s' " | |
1373 | "denied for %s\n", tomoyo_get_msg(is_enforce), | |
1374 | msg, buf1->name, buf2->name, | |
1375 | tomoyo_get_last_name(domain)); | |
1376 | if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { | |
1377 | const char *name1 = tomoyo_get_file_pattern(buf1)->name; | |
1378 | const char *name2 = tomoyo_get_file_pattern(buf2)->name; | |
1379 | tomoyo_update_double_path_acl(operation, name1, name2, domain, | |
1380 | false); | |
1381 | } | |
1382 | out: | |
1383 | tomoyo_free(buf1); | |
1384 | tomoyo_free(buf2); | |
fdb8ebb7 | 1385 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1386 | if (!is_enforce) |
1387 | error = 0; | |
1388 | return error; | |
1389 | } |