Commit | Line | Data |
---|---|---|
b69a54ee KT |
1 | /* |
2 | * security/tomoyo/file.c | |
3 | * | |
4 | * Implementation of the Domain-Based Mandatory Access Control. | |
5 | * | |
6 | * Copyright (C) 2005-2009 NTT DATA CORPORATION | |
7 | * | |
39826a1e | 8 | * Version: 2.2.0 2009/04/01 |
b69a54ee KT |
9 | * |
10 | */ | |
11 | ||
12 | #include "common.h" | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
b69a54ee KT |
14 | |
15 | /* Keyword array for single path operations. */ | |
7ef61233 TH |
16 | static const char *tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = { |
17 | [TOMOYO_TYPE_READ_WRITE] = "read/write", | |
18 | [TOMOYO_TYPE_EXECUTE] = "execute", | |
19 | [TOMOYO_TYPE_READ] = "read", | |
20 | [TOMOYO_TYPE_WRITE] = "write", | |
21 | [TOMOYO_TYPE_CREATE] = "create", | |
22 | [TOMOYO_TYPE_UNLINK] = "unlink", | |
23 | [TOMOYO_TYPE_MKDIR] = "mkdir", | |
24 | [TOMOYO_TYPE_RMDIR] = "rmdir", | |
25 | [TOMOYO_TYPE_MKFIFO] = "mkfifo", | |
26 | [TOMOYO_TYPE_MKSOCK] = "mksock", | |
27 | [TOMOYO_TYPE_MKBLOCK] = "mkblock", | |
28 | [TOMOYO_TYPE_MKCHAR] = "mkchar", | |
29 | [TOMOYO_TYPE_TRUNCATE] = "truncate", | |
30 | [TOMOYO_TYPE_SYMLINK] = "symlink", | |
31 | [TOMOYO_TYPE_REWRITE] = "rewrite", | |
32 | [TOMOYO_TYPE_IOCTL] = "ioctl", | |
33 | [TOMOYO_TYPE_CHMOD] = "chmod", | |
34 | [TOMOYO_TYPE_CHOWN] = "chown", | |
35 | [TOMOYO_TYPE_CHGRP] = "chgrp", | |
36 | [TOMOYO_TYPE_CHROOT] = "chroot", | |
37 | [TOMOYO_TYPE_MOUNT] = "mount", | |
38 | [TOMOYO_TYPE_UMOUNT] = "unmount", | |
b69a54ee KT |
39 | }; |
40 | ||
41 | /* Keyword array for double path operations. */ | |
7ef61233 TH |
42 | static const char *tomoyo_path2_keyword[TOMOYO_MAX_PATH2_OPERATION] = { |
43 | [TOMOYO_TYPE_LINK] = "link", | |
44 | [TOMOYO_TYPE_RENAME] = "rename", | |
45 | [TOMOYO_TYPE_PIVOT_ROOT] = "pivot_root", | |
b69a54ee KT |
46 | }; |
47 | ||
7762fbff TH |
48 | void tomoyo_put_name_union(struct tomoyo_name_union *ptr) |
49 | { | |
50 | if (!ptr) | |
51 | return; | |
52 | if (ptr->is_group) | |
53 | tomoyo_put_path_group(ptr->group); | |
54 | else | |
55 | tomoyo_put_name(ptr->filename); | |
56 | } | |
57 | ||
58 | bool tomoyo_compare_name_union(const struct tomoyo_path_info *name, | |
59 | const struct tomoyo_name_union *ptr) | |
60 | { | |
61 | if (ptr->is_group) | |
62 | return tomoyo_path_matches_group(name, ptr->group, 1); | |
63 | return tomoyo_path_matches_pattern(name, ptr->filename); | |
64 | } | |
65 | ||
66 | static bool tomoyo_compare_name_union_pattern(const struct tomoyo_path_info | |
67 | *name, | |
68 | const struct tomoyo_name_union | |
69 | *ptr, const bool may_use_pattern) | |
70 | { | |
71 | if (ptr->is_group) | |
72 | return tomoyo_path_matches_group(name, ptr->group, | |
73 | may_use_pattern); | |
74 | if (may_use_pattern || !ptr->filename->is_patterned) | |
75 | return tomoyo_path_matches_pattern(name, ptr->filename); | |
76 | return false; | |
77 | } | |
78 | ||
4c3e9e2d TH |
79 | void tomoyo_put_number_union(struct tomoyo_number_union *ptr) |
80 | { | |
81 | if (ptr && ptr->is_group) | |
82 | tomoyo_put_number_group(ptr->group); | |
83 | } | |
84 | ||
85 | bool tomoyo_compare_number_union(const unsigned long value, | |
86 | const struct tomoyo_number_union *ptr) | |
87 | { | |
88 | if (ptr->is_group) | |
89 | return tomoyo_number_matches_group(value, value, ptr->group); | |
90 | return value >= ptr->values[0] && value <= ptr->values[1]; | |
91 | } | |
92 | ||
b69a54ee | 93 | /** |
7ef61233 | 94 | * tomoyo_path2keyword - Get the name of single path operation. |
b69a54ee KT |
95 | * |
96 | * @operation: Type of operation. | |
97 | * | |
98 | * Returns the name of single path operation. | |
99 | */ | |
7ef61233 | 100 | const char *tomoyo_path2keyword(const u8 operation) |
b69a54ee | 101 | { |
7ef61233 TH |
102 | return (operation < TOMOYO_MAX_PATH_OPERATION) |
103 | ? tomoyo_path_keyword[operation] : NULL; | |
b69a54ee KT |
104 | } |
105 | ||
106 | /** | |
7ef61233 | 107 | * tomoyo_path22keyword - Get the name of double path operation. |
b69a54ee KT |
108 | * |
109 | * @operation: Type of operation. | |
110 | * | |
111 | * Returns the name of double path operation. | |
112 | */ | |
7ef61233 | 113 | const char *tomoyo_path22keyword(const u8 operation) |
b69a54ee | 114 | { |
7ef61233 TH |
115 | return (operation < TOMOYO_MAX_PATH2_OPERATION) |
116 | ? tomoyo_path2_keyword[operation] : NULL; | |
b69a54ee KT |
117 | } |
118 | ||
119 | /** | |
120 | * tomoyo_strendswith - Check whether the token ends with the given token. | |
121 | * | |
122 | * @name: The token to check. | |
123 | * @tail: The token to find. | |
124 | * | |
125 | * Returns true if @name ends with @tail, false otherwise. | |
126 | */ | |
127 | static bool tomoyo_strendswith(const char *name, const char *tail) | |
128 | { | |
129 | int len; | |
130 | ||
131 | if (!name || !tail) | |
132 | return false; | |
133 | len = strlen(name) - strlen(tail); | |
134 | return len >= 0 && !strcmp(name + len, tail); | |
135 | } | |
136 | ||
137 | /** | |
138 | * tomoyo_get_path - Get realpath. | |
139 | * | |
140 | * @path: Pointer to "struct path". | |
141 | * | |
142 | * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise. | |
143 | */ | |
144 | static struct tomoyo_path_info *tomoyo_get_path(struct path *path) | |
145 | { | |
146 | int error; | |
8e2d39a1 | 147 | struct tomoyo_path_info_with_data *buf = kzalloc(sizeof(*buf), |
4e5d6f7e | 148 | GFP_NOFS); |
b69a54ee KT |
149 | |
150 | if (!buf) | |
151 | return NULL; | |
152 | /* Reserve one byte for appending "/". */ | |
153 | error = tomoyo_realpath_from_path2(path, buf->body, | |
154 | sizeof(buf->body) - 2); | |
155 | if (!error) { | |
156 | buf->head.name = buf->body; | |
157 | tomoyo_fill_path_info(&buf->head); | |
158 | return &buf->head; | |
159 | } | |
8e2d39a1 | 160 | kfree(buf); |
b69a54ee KT |
161 | return NULL; |
162 | } | |
163 | ||
7ef61233 TH |
164 | static int tomoyo_update_path2_acl(const u8 type, const char *filename1, |
165 | const char *filename2, | |
166 | struct tomoyo_domain_info *const domain, | |
167 | const bool is_delete); | |
168 | static int tomoyo_update_path_acl(const u8 type, const char *filename, | |
169 | struct tomoyo_domain_info *const domain, | |
170 | const bool is_delete); | |
b69a54ee | 171 | |
c3fa109a TH |
172 | /* |
173 | * tomoyo_globally_readable_list is used for holding list of pathnames which | |
174 | * are by default allowed to be open()ed for reading by any process. | |
175 | * | |
176 | * An entry is added by | |
177 | * | |
178 | * # echo 'allow_read /lib/libc-2.5.so' > \ | |
179 | * /sys/kernel/security/tomoyo/exception_policy | |
180 | * | |
181 | * and is deleted by | |
182 | * | |
183 | * # echo 'delete allow_read /lib/libc-2.5.so' > \ | |
184 | * /sys/kernel/security/tomoyo/exception_policy | |
185 | * | |
186 | * and all entries are retrieved by | |
187 | * | |
188 | * # grep ^allow_read /sys/kernel/security/tomoyo/exception_policy | |
189 | * | |
190 | * In the example above, any process is allowed to | |
191 | * open("/lib/libc-2.5.so", O_RDONLY). | |
192 | * One exception is, if the domain which current process belongs to is marked | |
193 | * as "ignore_global_allow_read", current process can't do so unless explicitly | |
194 | * given "allow_read /lib/libc-2.5.so" to the domain which current process | |
195 | * belongs to. | |
196 | */ | |
847b173e | 197 | LIST_HEAD(tomoyo_globally_readable_list); |
b69a54ee KT |
198 | |
199 | /** | |
200 | * tomoyo_update_globally_readable_entry - Update "struct tomoyo_globally_readable_file_entry" list. | |
201 | * | |
202 | * @filename: Filename unconditionally permitted to open() for reading. | |
203 | * @is_delete: True if it is a delete request. | |
204 | * | |
205 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
206 | * |
207 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
208 | */ |
209 | static int tomoyo_update_globally_readable_entry(const char *filename, | |
210 | const bool is_delete) | |
211 | { | |
b69a54ee | 212 | struct tomoyo_globally_readable_file_entry *ptr; |
9e4b50e9 | 213 | struct tomoyo_globally_readable_file_entry e = { }; |
ca0b7df3 | 214 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 215 | |
17080008 | 216 | if (!tomoyo_is_correct_path(filename, 1, 0, -1)) |
b69a54ee | 217 | return -EINVAL; |
9e4b50e9 TH |
218 | e.filename = tomoyo_get_name(filename); |
219 | if (!e.filename) | |
b69a54ee | 220 | return -ENOMEM; |
29282381 TH |
221 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
222 | goto out; | |
fdb8ebb7 | 223 | list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { |
9e4b50e9 | 224 | if (ptr->filename != e.filename) |
b69a54ee KT |
225 | continue; |
226 | ptr->is_deleted = is_delete; | |
227 | error = 0; | |
ca0b7df3 | 228 | break; |
b69a54ee | 229 | } |
9e4b50e9 TH |
230 | if (!is_delete && error) { |
231 | struct tomoyo_globally_readable_file_entry *entry = | |
232 | tomoyo_commit_ok(&e, sizeof(e)); | |
233 | if (entry) { | |
234 | list_add_tail_rcu(&entry->list, | |
235 | &tomoyo_globally_readable_list); | |
236 | error = 0; | |
237 | } | |
b69a54ee | 238 | } |
f737d95d | 239 | mutex_unlock(&tomoyo_policy_lock); |
29282381 | 240 | out: |
9e4b50e9 | 241 | tomoyo_put_name(e.filename); |
b69a54ee KT |
242 | return error; |
243 | } | |
244 | ||
245 | /** | |
246 | * tomoyo_is_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading. | |
247 | * | |
248 | * @filename: The filename to check. | |
249 | * | |
250 | * Returns true if any domain can open @filename for reading, false otherwise. | |
fdb8ebb7 TH |
251 | * |
252 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
253 | */ |
254 | static bool tomoyo_is_globally_readable_file(const struct tomoyo_path_info * | |
255 | filename) | |
256 | { | |
257 | struct tomoyo_globally_readable_file_entry *ptr; | |
258 | bool found = false; | |
fdb8ebb7 TH |
259 | |
260 | list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { | |
b69a54ee KT |
261 | if (!ptr->is_deleted && |
262 | tomoyo_path_matches_pattern(filename, ptr->filename)) { | |
263 | found = true; | |
264 | break; | |
265 | } | |
266 | } | |
b69a54ee KT |
267 | return found; |
268 | } | |
269 | ||
270 | /** | |
271 | * tomoyo_write_globally_readable_policy - Write "struct tomoyo_globally_readable_file_entry" list. | |
272 | * | |
273 | * @data: String to parse. | |
274 | * @is_delete: True if it is a delete request. | |
275 | * | |
276 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
277 | * |
278 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
279 | */ |
280 | int tomoyo_write_globally_readable_policy(char *data, const bool is_delete) | |
281 | { | |
282 | return tomoyo_update_globally_readable_entry(data, is_delete); | |
283 | } | |
284 | ||
285 | /** | |
286 | * tomoyo_read_globally_readable_policy - Read "struct tomoyo_globally_readable_file_entry" list. | |
287 | * | |
288 | * @head: Pointer to "struct tomoyo_io_buffer". | |
289 | * | |
290 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
291 | * |
292 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
293 | */ |
294 | bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head) | |
295 | { | |
296 | struct list_head *pos; | |
297 | bool done = true; | |
298 | ||
b69a54ee KT |
299 | list_for_each_cookie(pos, head->read_var2, |
300 | &tomoyo_globally_readable_list) { | |
301 | struct tomoyo_globally_readable_file_entry *ptr; | |
302 | ptr = list_entry(pos, | |
303 | struct tomoyo_globally_readable_file_entry, | |
304 | list); | |
305 | if (ptr->is_deleted) | |
306 | continue; | |
7d2948b1 TH |
307 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_READ "%s\n", |
308 | ptr->filename->name); | |
309 | if (!done) | |
b69a54ee | 310 | break; |
b69a54ee | 311 | } |
b69a54ee KT |
312 | return done; |
313 | } | |
314 | ||
c3fa109a TH |
315 | /* tomoyo_pattern_list is used for holding list of pathnames which are used for |
316 | * converting pathnames to pathname patterns during learning mode. | |
317 | * | |
318 | * An entry is added by | |
319 | * | |
320 | * # echo 'file_pattern /proc/\$/mounts' > \ | |
321 | * /sys/kernel/security/tomoyo/exception_policy | |
322 | * | |
323 | * and is deleted by | |
324 | * | |
325 | * # echo 'delete file_pattern /proc/\$/mounts' > \ | |
326 | * /sys/kernel/security/tomoyo/exception_policy | |
327 | * | |
328 | * and all entries are retrieved by | |
329 | * | |
330 | * # grep ^file_pattern /sys/kernel/security/tomoyo/exception_policy | |
331 | * | |
332 | * In the example above, if a process which belongs to a domain which is in | |
333 | * learning mode requested open("/proc/1/mounts", O_RDONLY), | |
334 | * "allow_read /proc/\$/mounts" is automatically added to the domain which that | |
335 | * process belongs to. | |
336 | * | |
337 | * It is not a desirable behavior that we have to use /proc/\$/ instead of | |
338 | * /proc/self/ when current process needs to access only current process's | |
339 | * information. As of now, LSM version of TOMOYO is using __d_path() for | |
340 | * calculating pathname. Non LSM version of TOMOYO is using its own function | |
341 | * which pretends as if /proc/self/ is not a symlink; so that we can forbid | |
342 | * current process from accessing other process's information. | |
343 | */ | |
847b173e | 344 | LIST_HEAD(tomoyo_pattern_list); |
b69a54ee KT |
345 | |
346 | /** | |
347 | * tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list. | |
348 | * | |
349 | * @pattern: Pathname pattern. | |
350 | * @is_delete: True if it is a delete request. | |
351 | * | |
352 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
353 | * |
354 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
355 | */ |
356 | static int tomoyo_update_file_pattern_entry(const char *pattern, | |
357 | const bool is_delete) | |
358 | { | |
b69a54ee | 359 | struct tomoyo_pattern_entry *ptr; |
9e4b50e9 | 360 | struct tomoyo_pattern_entry e = { .pattern = tomoyo_get_name(pattern) }; |
ca0b7df3 | 361 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 362 | |
9e4b50e9 | 363 | if (!e.pattern) |
ca0b7df3 | 364 | return error; |
9e4b50e9 | 365 | if (!e.pattern->is_patterned) |
ca0b7df3 | 366 | goto out; |
29282381 TH |
367 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
368 | goto out; | |
fdb8ebb7 | 369 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { |
9e4b50e9 | 370 | if (e.pattern != ptr->pattern) |
b69a54ee KT |
371 | continue; |
372 | ptr->is_deleted = is_delete; | |
373 | error = 0; | |
ca0b7df3 | 374 | break; |
b69a54ee | 375 | } |
9e4b50e9 TH |
376 | if (!is_delete && error) { |
377 | struct tomoyo_pattern_entry *entry = | |
378 | tomoyo_commit_ok(&e, sizeof(e)); | |
379 | if (entry) { | |
380 | list_add_tail_rcu(&entry->list, &tomoyo_pattern_list); | |
381 | error = 0; | |
382 | } | |
b69a54ee | 383 | } |
f737d95d | 384 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 385 | out: |
9e4b50e9 | 386 | tomoyo_put_name(e.pattern); |
b69a54ee KT |
387 | return error; |
388 | } | |
389 | ||
390 | /** | |
391 | * tomoyo_get_file_pattern - Get patterned pathname. | |
392 | * | |
393 | * @filename: The filename to find patterned pathname. | |
394 | * | |
395 | * Returns pointer to pathname pattern if matched, @filename otherwise. | |
fdb8ebb7 TH |
396 | * |
397 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
398 | */ |
399 | static const struct tomoyo_path_info * | |
400 | tomoyo_get_file_pattern(const struct tomoyo_path_info *filename) | |
401 | { | |
402 | struct tomoyo_pattern_entry *ptr; | |
403 | const struct tomoyo_path_info *pattern = NULL; | |
404 | ||
fdb8ebb7 | 405 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { |
b69a54ee KT |
406 | if (ptr->is_deleted) |
407 | continue; | |
408 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
409 | continue; | |
410 | pattern = ptr->pattern; | |
411 | if (tomoyo_strendswith(pattern->name, "/\\*")) { | |
412 | /* Do nothing. Try to find the better match. */ | |
413 | } else { | |
414 | /* This would be the better match. Use this. */ | |
415 | break; | |
416 | } | |
417 | } | |
b69a54ee KT |
418 | if (pattern) |
419 | filename = pattern; | |
420 | return filename; | |
421 | } | |
422 | ||
423 | /** | |
424 | * tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list. | |
425 | * | |
426 | * @data: String to parse. | |
427 | * @is_delete: True if it is a delete request. | |
428 | * | |
429 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
430 | * |
431 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
432 | */ |
433 | int tomoyo_write_pattern_policy(char *data, const bool is_delete) | |
434 | { | |
435 | return tomoyo_update_file_pattern_entry(data, is_delete); | |
436 | } | |
437 | ||
438 | /** | |
439 | * tomoyo_read_file_pattern - Read "struct tomoyo_pattern_entry" list. | |
440 | * | |
441 | * @head: Pointer to "struct tomoyo_io_buffer". | |
442 | * | |
443 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
444 | * |
445 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
446 | */ |
447 | bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head) | |
448 | { | |
449 | struct list_head *pos; | |
450 | bool done = true; | |
451 | ||
b69a54ee KT |
452 | list_for_each_cookie(pos, head->read_var2, &tomoyo_pattern_list) { |
453 | struct tomoyo_pattern_entry *ptr; | |
454 | ptr = list_entry(pos, struct tomoyo_pattern_entry, list); | |
455 | if (ptr->is_deleted) | |
456 | continue; | |
7d2948b1 TH |
457 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_FILE_PATTERN |
458 | "%s\n", ptr->pattern->name); | |
459 | if (!done) | |
b69a54ee | 460 | break; |
b69a54ee | 461 | } |
b69a54ee KT |
462 | return done; |
463 | } | |
464 | ||
c3fa109a TH |
465 | /* |
466 | * tomoyo_no_rewrite_list is used for holding list of pathnames which are by | |
467 | * default forbidden to modify already written content of a file. | |
468 | * | |
469 | * An entry is added by | |
470 | * | |
471 | * # echo 'deny_rewrite /var/log/messages' > \ | |
472 | * /sys/kernel/security/tomoyo/exception_policy | |
473 | * | |
474 | * and is deleted by | |
475 | * | |
476 | * # echo 'delete deny_rewrite /var/log/messages' > \ | |
477 | * /sys/kernel/security/tomoyo/exception_policy | |
478 | * | |
479 | * and all entries are retrieved by | |
480 | * | |
481 | * # grep ^deny_rewrite /sys/kernel/security/tomoyo/exception_policy | |
482 | * | |
483 | * In the example above, if a process requested to rewrite /var/log/messages , | |
484 | * the process can't rewrite unless the domain which that process belongs to | |
485 | * has "allow_rewrite /var/log/messages" entry. | |
486 | * | |
487 | * It is not a desirable behavior that we have to add "\040(deleted)" suffix | |
488 | * when we want to allow rewriting already unlink()ed file. As of now, | |
489 | * LSM version of TOMOYO is using __d_path() for calculating pathname. | |
490 | * Non LSM version of TOMOYO is using its own function which doesn't append | |
491 | * " (deleted)" suffix if the file is already unlink()ed; so that we don't | |
492 | * need to worry whether the file is already unlink()ed or not. | |
493 | */ | |
847b173e | 494 | LIST_HEAD(tomoyo_no_rewrite_list); |
b69a54ee KT |
495 | |
496 | /** | |
497 | * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list. | |
498 | * | |
499 | * @pattern: Pathname pattern that are not rewritable by default. | |
500 | * @is_delete: True if it is a delete request. | |
501 | * | |
502 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
503 | * |
504 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
505 | */ |
506 | static int tomoyo_update_no_rewrite_entry(const char *pattern, | |
507 | const bool is_delete) | |
508 | { | |
ca0b7df3 | 509 | struct tomoyo_no_rewrite_entry *ptr; |
9e4b50e9 | 510 | struct tomoyo_no_rewrite_entry e = { }; |
ca0b7df3 | 511 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 512 | |
17080008 | 513 | if (!tomoyo_is_correct_path(pattern, 0, 0, 0)) |
b69a54ee | 514 | return -EINVAL; |
9e4b50e9 TH |
515 | e.pattern = tomoyo_get_name(pattern); |
516 | if (!e.pattern) | |
ca0b7df3 | 517 | return error; |
29282381 TH |
518 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
519 | goto out; | |
fdb8ebb7 | 520 | list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { |
9e4b50e9 | 521 | if (ptr->pattern != e.pattern) |
b69a54ee KT |
522 | continue; |
523 | ptr->is_deleted = is_delete; | |
524 | error = 0; | |
ca0b7df3 | 525 | break; |
b69a54ee | 526 | } |
9e4b50e9 TH |
527 | if (!is_delete && error) { |
528 | struct tomoyo_no_rewrite_entry *entry = | |
529 | tomoyo_commit_ok(&e, sizeof(e)); | |
530 | if (entry) { | |
531 | list_add_tail_rcu(&entry->list, | |
532 | &tomoyo_no_rewrite_list); | |
533 | error = 0; | |
534 | } | |
b69a54ee | 535 | } |
f737d95d | 536 | mutex_unlock(&tomoyo_policy_lock); |
29282381 | 537 | out: |
9e4b50e9 | 538 | tomoyo_put_name(e.pattern); |
b69a54ee KT |
539 | return error; |
540 | } | |
541 | ||
542 | /** | |
543 | * tomoyo_is_no_rewrite_file - Check if the given pathname is not permitted to be rewrited. | |
544 | * | |
545 | * @filename: Filename to check. | |
546 | * | |
547 | * Returns true if @filename is specified by "deny_rewrite" directive, | |
548 | * false otherwise. | |
fdb8ebb7 TH |
549 | * |
550 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
551 | */ |
552 | static bool tomoyo_is_no_rewrite_file(const struct tomoyo_path_info *filename) | |
553 | { | |
554 | struct tomoyo_no_rewrite_entry *ptr; | |
555 | bool found = false; | |
556 | ||
fdb8ebb7 | 557 | list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { |
b69a54ee KT |
558 | if (ptr->is_deleted) |
559 | continue; | |
560 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
561 | continue; | |
562 | found = true; | |
563 | break; | |
564 | } | |
b69a54ee KT |
565 | return found; |
566 | } | |
567 | ||
568 | /** | |
569 | * tomoyo_write_no_rewrite_policy - Write "struct tomoyo_no_rewrite_entry" list. | |
570 | * | |
571 | * @data: String to parse. | |
572 | * @is_delete: True if it is a delete request. | |
573 | * | |
574 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
575 | * |
576 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
577 | */ |
578 | int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete) | |
579 | { | |
580 | return tomoyo_update_no_rewrite_entry(data, is_delete); | |
581 | } | |
582 | ||
583 | /** | |
584 | * tomoyo_read_no_rewrite_policy - Read "struct tomoyo_no_rewrite_entry" list. | |
585 | * | |
586 | * @head: Pointer to "struct tomoyo_io_buffer". | |
587 | * | |
588 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
589 | * |
590 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
591 | */ |
592 | bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head) | |
593 | { | |
594 | struct list_head *pos; | |
595 | bool done = true; | |
596 | ||
b69a54ee KT |
597 | list_for_each_cookie(pos, head->read_var2, &tomoyo_no_rewrite_list) { |
598 | struct tomoyo_no_rewrite_entry *ptr; | |
599 | ptr = list_entry(pos, struct tomoyo_no_rewrite_entry, list); | |
600 | if (ptr->is_deleted) | |
601 | continue; | |
7d2948b1 TH |
602 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_DENY_REWRITE |
603 | "%s\n", ptr->pattern->name); | |
604 | if (!done) | |
b69a54ee | 605 | break; |
b69a54ee | 606 | } |
b69a54ee KT |
607 | return done; |
608 | } | |
609 | ||
610 | /** | |
611 | * tomoyo_update_file_acl - Update file's read/write/execute ACL. | |
612 | * | |
613 | * @filename: Filename. | |
614 | * @perm: Permission (between 1 to 7). | |
615 | * @domain: Pointer to "struct tomoyo_domain_info". | |
616 | * @is_delete: True if it is a delete request. | |
617 | * | |
618 | * Returns 0 on success, negative value otherwise. | |
619 | * | |
620 | * This is legacy support interface for older policy syntax. | |
621 | * Current policy syntax uses "allow_read/write" instead of "6", | |
622 | * "allow_read" instead of "4", "allow_write" instead of "2", | |
623 | * "allow_execute" instead of "1". | |
fdb8ebb7 TH |
624 | * |
625 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
626 | */ |
627 | static int tomoyo_update_file_acl(const char *filename, u8 perm, | |
628 | struct tomoyo_domain_info * const domain, | |
629 | const bool is_delete) | |
630 | { | |
631 | if (perm > 7 || !perm) { | |
632 | printk(KERN_DEBUG "%s: Invalid permission '%d %s'\n", | |
633 | __func__, perm, filename); | |
634 | return -EINVAL; | |
635 | } | |
636 | if (filename[0] != '@' && tomoyo_strendswith(filename, "/")) | |
637 | /* | |
638 | * Only 'allow_mkdir' and 'allow_rmdir' are valid for | |
639 | * directory permissions. | |
640 | */ | |
641 | return 0; | |
642 | if (perm & 4) | |
7ef61233 TH |
643 | tomoyo_update_path_acl(TOMOYO_TYPE_READ, filename, domain, |
644 | is_delete); | |
b69a54ee | 645 | if (perm & 2) |
7ef61233 TH |
646 | tomoyo_update_path_acl(TOMOYO_TYPE_WRITE, filename, domain, |
647 | is_delete); | |
b69a54ee | 648 | if (perm & 1) |
7ef61233 TH |
649 | tomoyo_update_path_acl(TOMOYO_TYPE_EXECUTE, filename, domain, |
650 | is_delete); | |
b69a54ee KT |
651 | return 0; |
652 | } | |
653 | ||
654 | /** | |
7ef61233 | 655 | * tomoyo_path_acl2 - Check permission for single path operation. |
b69a54ee KT |
656 | * |
657 | * @domain: Pointer to "struct tomoyo_domain_info". | |
658 | * @filename: Filename to check. | |
659 | * @perm: Permission. | |
660 | * @may_use_pattern: True if patterned ACL is permitted. | |
661 | * | |
662 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
663 | * |
664 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 665 | */ |
7ef61233 TH |
666 | static int tomoyo_path_acl2(const struct tomoyo_domain_info *domain, |
667 | const struct tomoyo_path_info *filename, | |
668 | const u32 perm, const bool may_use_pattern) | |
b69a54ee KT |
669 | { |
670 | struct tomoyo_acl_info *ptr; | |
671 | int error = -EPERM; | |
672 | ||
fdb8ebb7 | 673 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
674 | struct tomoyo_path_acl *acl; |
675 | if (ptr->type != TOMOYO_TYPE_PATH_ACL) | |
b69a54ee | 676 | continue; |
7ef61233 | 677 | acl = container_of(ptr, struct tomoyo_path_acl, head); |
937bf613 TH |
678 | if (perm <= 0xFFFF) { |
679 | if (!(acl->perm & perm)) | |
680 | continue; | |
681 | } else { | |
682 | if (!(acl->perm_high & (perm >> 16))) | |
683 | continue; | |
684 | } | |
7762fbff TH |
685 | if (!tomoyo_compare_name_union_pattern(filename, &acl->name, |
686 | may_use_pattern)) | |
b69a54ee | 687 | continue; |
b69a54ee KT |
688 | error = 0; |
689 | break; | |
690 | } | |
b69a54ee KT |
691 | return error; |
692 | } | |
693 | ||
694 | /** | |
695 | * tomoyo_check_file_acl - Check permission for opening files. | |
696 | * | |
697 | * @domain: Pointer to "struct tomoyo_domain_info". | |
698 | * @filename: Filename to check. | |
699 | * @operation: Mode ("read" or "write" or "read/write" or "execute"). | |
700 | * | |
701 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
702 | * |
703 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
704 | */ |
705 | static int tomoyo_check_file_acl(const struct tomoyo_domain_info *domain, | |
706 | const struct tomoyo_path_info *filename, | |
707 | const u8 operation) | |
708 | { | |
937bf613 | 709 | u32 perm = 0; |
b69a54ee KT |
710 | |
711 | if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) | |
712 | return 0; | |
713 | if (operation == 6) | |
7ef61233 | 714 | perm = 1 << TOMOYO_TYPE_READ_WRITE; |
b69a54ee | 715 | else if (operation == 4) |
7ef61233 | 716 | perm = 1 << TOMOYO_TYPE_READ; |
b69a54ee | 717 | else if (operation == 2) |
7ef61233 | 718 | perm = 1 << TOMOYO_TYPE_WRITE; |
b69a54ee | 719 | else if (operation == 1) |
7ef61233 | 720 | perm = 1 << TOMOYO_TYPE_EXECUTE; |
b69a54ee KT |
721 | else |
722 | BUG(); | |
7ef61233 | 723 | return tomoyo_path_acl2(domain, filename, perm, operation != 1); |
b69a54ee KT |
724 | } |
725 | ||
726 | /** | |
727 | * tomoyo_check_file_perm2 - Check permission for opening files. | |
728 | * | |
729 | * @domain: Pointer to "struct tomoyo_domain_info". | |
730 | * @filename: Filename to check. | |
731 | * @perm: Mode ("read" or "write" or "read/write" or "execute"). | |
732 | * @operation: Operation name passed used for verbose mode. | |
733 | * @mode: Access control mode. | |
734 | * | |
735 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
736 | * |
737 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
738 | */ |
739 | static int tomoyo_check_file_perm2(struct tomoyo_domain_info * const domain, | |
740 | const struct tomoyo_path_info *filename, | |
741 | const u8 perm, const char *operation, | |
742 | const u8 mode) | |
743 | { | |
744 | const bool is_enforce = (mode == 3); | |
745 | const char *msg = "<unknown>"; | |
746 | int error = 0; | |
747 | ||
748 | if (!filename) | |
749 | return 0; | |
750 | error = tomoyo_check_file_acl(domain, filename, perm); | |
ea13ddba | 751 | if (error && perm == 4 && !domain->ignore_global_allow_read |
b69a54ee KT |
752 | && tomoyo_is_globally_readable_file(filename)) |
753 | error = 0; | |
754 | if (perm == 6) | |
7ef61233 | 755 | msg = tomoyo_path2keyword(TOMOYO_TYPE_READ_WRITE); |
b69a54ee | 756 | else if (perm == 4) |
7ef61233 | 757 | msg = tomoyo_path2keyword(TOMOYO_TYPE_READ); |
b69a54ee | 758 | else if (perm == 2) |
7ef61233 | 759 | msg = tomoyo_path2keyword(TOMOYO_TYPE_WRITE); |
b69a54ee | 760 | else if (perm == 1) |
7ef61233 | 761 | msg = tomoyo_path2keyword(TOMOYO_TYPE_EXECUTE); |
b69a54ee KT |
762 | else |
763 | BUG(); | |
764 | if (!error) | |
765 | return 0; | |
766 | if (tomoyo_verbose_mode(domain)) | |
767 | printk(KERN_WARNING "TOMOYO-%s: Access '%s(%s) %s' denied " | |
768 | "for %s\n", tomoyo_get_msg(is_enforce), msg, operation, | |
769 | filename->name, tomoyo_get_last_name(domain)); | |
770 | if (is_enforce) | |
771 | return error; | |
772 | if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { | |
773 | /* Don't use patterns for execute permission. */ | |
774 | const struct tomoyo_path_info *patterned_file = (perm != 1) ? | |
775 | tomoyo_get_file_pattern(filename) : filename; | |
776 | tomoyo_update_file_acl(patterned_file->name, perm, | |
777 | domain, false); | |
778 | } | |
779 | return 0; | |
780 | } | |
781 | ||
782 | /** | |
783 | * tomoyo_write_file_policy - Update file related list. | |
784 | * | |
785 | * @data: String to parse. | |
786 | * @domain: Pointer to "struct tomoyo_domain_info". | |
787 | * @is_delete: True if it is a delete request. | |
788 | * | |
789 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
790 | * |
791 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
792 | */ |
793 | int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, | |
794 | const bool is_delete) | |
795 | { | |
796 | char *filename = strchr(data, ' '); | |
797 | char *filename2; | |
798 | unsigned int perm; | |
799 | u8 type; | |
800 | ||
801 | if (!filename) | |
802 | return -EINVAL; | |
803 | *filename++ = '\0'; | |
804 | if (sscanf(data, "%u", &perm) == 1) | |
805 | return tomoyo_update_file_acl(filename, (u8) perm, domain, | |
806 | is_delete); | |
807 | if (strncmp(data, "allow_", 6)) | |
808 | goto out; | |
809 | data += 6; | |
7ef61233 TH |
810 | for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) { |
811 | if (strcmp(data, tomoyo_path_keyword[type])) | |
b69a54ee | 812 | continue; |
7ef61233 TH |
813 | return tomoyo_update_path_acl(type, filename, domain, |
814 | is_delete); | |
b69a54ee KT |
815 | } |
816 | filename2 = strchr(filename, ' '); | |
817 | if (!filename2) | |
818 | goto out; | |
819 | *filename2++ = '\0'; | |
7ef61233 TH |
820 | for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) { |
821 | if (strcmp(data, tomoyo_path2_keyword[type])) | |
b69a54ee | 822 | continue; |
7ef61233 TH |
823 | return tomoyo_update_path2_acl(type, filename, filename2, |
824 | domain, is_delete); | |
b69a54ee KT |
825 | } |
826 | out: | |
827 | return -EINVAL; | |
828 | } | |
829 | ||
830 | /** | |
7ef61233 | 831 | * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list. |
b69a54ee KT |
832 | * |
833 | * @type: Type of operation. | |
834 | * @filename: Filename. | |
835 | * @domain: Pointer to "struct tomoyo_domain_info". | |
836 | * @is_delete: True if it is a delete request. | |
837 | * | |
838 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
839 | * |
840 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 841 | */ |
7ef61233 TH |
842 | static int tomoyo_update_path_acl(const u8 type, const char *filename, |
843 | struct tomoyo_domain_info *const domain, | |
844 | const bool is_delete) | |
b69a54ee | 845 | { |
9e4b50e9 | 846 | static const u32 tomoyo_rw_mask = |
7ef61233 | 847 | (1 << TOMOYO_TYPE_READ) | (1 << TOMOYO_TYPE_WRITE); |
9e4b50e9 | 848 | const u32 perm = 1 << type; |
b69a54ee | 849 | struct tomoyo_acl_info *ptr; |
9e4b50e9 TH |
850 | struct tomoyo_path_acl e = { |
851 | .head.type = TOMOYO_TYPE_PATH_ACL, | |
852 | .perm_high = perm >> 16, | |
853 | .perm = perm | |
854 | }; | |
ca0b7df3 | 855 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 856 | |
9e4b50e9 TH |
857 | if (type == TOMOYO_TYPE_READ_WRITE) |
858 | e.perm |= tomoyo_rw_mask; | |
b69a54ee KT |
859 | if (!domain) |
860 | return -EINVAL; | |
7762fbff | 861 | if (!tomoyo_parse_name_union(filename, &e.name)) |
b69a54ee | 862 | return -EINVAL; |
29282381 TH |
863 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
864 | goto out; | |
fdb8ebb7 | 865 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
866 | struct tomoyo_path_acl *acl = |
867 | container_of(ptr, struct tomoyo_path_acl, head); | |
7762fbff | 868 | if (!tomoyo_is_same_path_acl(acl, &e)) |
b69a54ee | 869 | continue; |
ca0b7df3 TH |
870 | if (is_delete) { |
871 | if (perm <= 0xFFFF) | |
872 | acl->perm &= ~perm; | |
873 | else | |
874 | acl->perm_high &= ~(perm >> 16); | |
9e4b50e9 | 875 | if ((acl->perm & tomoyo_rw_mask) != tomoyo_rw_mask) |
7ef61233 TH |
876 | acl->perm &= ~(1 << TOMOYO_TYPE_READ_WRITE); |
877 | else if (!(acl->perm & (1 << TOMOYO_TYPE_READ_WRITE))) | |
9e4b50e9 | 878 | acl->perm &= ~tomoyo_rw_mask; |
ca0b7df3 TH |
879 | } else { |
880 | if (perm <= 0xFFFF) | |
881 | acl->perm |= perm; | |
882 | else | |
883 | acl->perm_high |= (perm >> 16); | |
9e4b50e9 | 884 | if ((acl->perm & tomoyo_rw_mask) == tomoyo_rw_mask) |
7ef61233 TH |
885 | acl->perm |= 1 << TOMOYO_TYPE_READ_WRITE; |
886 | else if (acl->perm & (1 << TOMOYO_TYPE_READ_WRITE)) | |
9e4b50e9 | 887 | acl->perm |= tomoyo_rw_mask; |
ca0b7df3 | 888 | } |
b69a54ee | 889 | error = 0; |
ca0b7df3 | 890 | break; |
cd7bec6a | 891 | } |
9e4b50e9 TH |
892 | if (!is_delete && error) { |
893 | struct tomoyo_path_acl *entry = | |
894 | tomoyo_commit_ok(&e, sizeof(e)); | |
895 | if (entry) { | |
896 | list_add_tail_rcu(&entry->head.list, | |
897 | &domain->acl_info_list); | |
898 | error = 0; | |
899 | } | |
b69a54ee | 900 | } |
f737d95d | 901 | mutex_unlock(&tomoyo_policy_lock); |
29282381 | 902 | out: |
7762fbff | 903 | tomoyo_put_name_union(&e.name); |
b69a54ee KT |
904 | return error; |
905 | } | |
906 | ||
907 | /** | |
7ef61233 | 908 | * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list. |
b69a54ee KT |
909 | * |
910 | * @type: Type of operation. | |
911 | * @filename1: First filename. | |
912 | * @filename2: Second filename. | |
913 | * @domain: Pointer to "struct tomoyo_domain_info". | |
914 | * @is_delete: True if it is a delete request. | |
915 | * | |
916 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
917 | * |
918 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 919 | */ |
7ef61233 TH |
920 | static int tomoyo_update_path2_acl(const u8 type, const char *filename1, |
921 | const char *filename2, | |
922 | struct tomoyo_domain_info *const domain, | |
923 | const bool is_delete) | |
b69a54ee | 924 | { |
9e4b50e9 TH |
925 | const u8 perm = 1 << type; |
926 | struct tomoyo_path2_acl e = { | |
927 | .head.type = TOMOYO_TYPE_PATH2_ACL, | |
928 | .perm = perm | |
929 | }; | |
b69a54ee | 930 | struct tomoyo_acl_info *ptr; |
ca0b7df3 | 931 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee KT |
932 | |
933 | if (!domain) | |
934 | return -EINVAL; | |
7762fbff TH |
935 | if (!tomoyo_parse_name_union(filename1, &e.name1) || |
936 | !tomoyo_parse_name_union(filename2, &e.name2)) | |
ca0b7df3 | 937 | goto out; |
29282381 TH |
938 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
939 | goto out; | |
fdb8ebb7 | 940 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
941 | struct tomoyo_path2_acl *acl = |
942 | container_of(ptr, struct tomoyo_path2_acl, head); | |
7762fbff | 943 | if (!tomoyo_is_same_path2_acl(acl, &e)) |
b69a54ee | 944 | continue; |
ca0b7df3 TH |
945 | if (is_delete) |
946 | acl->perm &= ~perm; | |
947 | else | |
948 | acl->perm |= perm; | |
b69a54ee | 949 | error = 0; |
ca0b7df3 | 950 | break; |
cd7bec6a | 951 | } |
9e4b50e9 TH |
952 | if (!is_delete && error) { |
953 | struct tomoyo_path2_acl *entry = | |
954 | tomoyo_commit_ok(&e, sizeof(e)); | |
955 | if (entry) { | |
956 | list_add_tail_rcu(&entry->head.list, | |
957 | &domain->acl_info_list); | |
958 | error = 0; | |
959 | } | |
b69a54ee | 960 | } |
f737d95d | 961 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 962 | out: |
7762fbff TH |
963 | tomoyo_put_name_union(&e.name1); |
964 | tomoyo_put_name_union(&e.name2); | |
b69a54ee KT |
965 | return error; |
966 | } | |
967 | ||
968 | /** | |
7ef61233 | 969 | * tomoyo_path_acl - Check permission for single path operation. |
b69a54ee KT |
970 | * |
971 | * @domain: Pointer to "struct tomoyo_domain_info". | |
972 | * @type: Type of operation. | |
973 | * @filename: Filename to check. | |
974 | * | |
975 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
976 | * |
977 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 978 | */ |
7ef61233 TH |
979 | static int tomoyo_path_acl(struct tomoyo_domain_info *domain, const u8 type, |
980 | const struct tomoyo_path_info *filename) | |
b69a54ee KT |
981 | { |
982 | if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) | |
983 | return 0; | |
7ef61233 | 984 | return tomoyo_path_acl2(domain, filename, 1 << type, 1); |
b69a54ee KT |
985 | } |
986 | ||
987 | /** | |
7ef61233 | 988 | * tomoyo_path2_acl - Check permission for double path operation. |
b69a54ee KT |
989 | * |
990 | * @domain: Pointer to "struct tomoyo_domain_info". | |
991 | * @type: Type of operation. | |
992 | * @filename1: First filename to check. | |
993 | * @filename2: Second filename to check. | |
994 | * | |
995 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
996 | * |
997 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 998 | */ |
7ef61233 TH |
999 | static int tomoyo_path2_acl(const struct tomoyo_domain_info *domain, |
1000 | const u8 type, | |
1001 | const struct tomoyo_path_info *filename1, | |
1002 | const struct tomoyo_path_info *filename2) | |
b69a54ee KT |
1003 | { |
1004 | struct tomoyo_acl_info *ptr; | |
1005 | const u8 perm = 1 << type; | |
1006 | int error = -EPERM; | |
1007 | ||
1008 | if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) | |
1009 | return 0; | |
fdb8ebb7 | 1010 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
1011 | struct tomoyo_path2_acl *acl; |
1012 | if (ptr->type != TOMOYO_TYPE_PATH2_ACL) | |
b69a54ee | 1013 | continue; |
7ef61233 | 1014 | acl = container_of(ptr, struct tomoyo_path2_acl, head); |
b69a54ee KT |
1015 | if (!(acl->perm & perm)) |
1016 | continue; | |
7762fbff | 1017 | if (!tomoyo_compare_name_union(filename1, &acl->name1)) |
b69a54ee | 1018 | continue; |
7762fbff | 1019 | if (!tomoyo_compare_name_union(filename2, &acl->name2)) |
b69a54ee KT |
1020 | continue; |
1021 | error = 0; | |
1022 | break; | |
1023 | } | |
b69a54ee KT |
1024 | return error; |
1025 | } | |
1026 | ||
1027 | /** | |
7ef61233 | 1028 | * tomoyo_path_permission2 - Check permission for single path operation. |
b69a54ee KT |
1029 | * |
1030 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1031 | * @operation: Type of operation. | |
1032 | * @filename: Filename to check. | |
1033 | * @mode: Access control mode. | |
1034 | * | |
1035 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1036 | * |
1037 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 1038 | */ |
7ef61233 TH |
1039 | static int tomoyo_path_permission2(struct tomoyo_domain_info *const domain, |
1040 | u8 operation, | |
1041 | const struct tomoyo_path_info *filename, | |
1042 | const u8 mode) | |
b69a54ee KT |
1043 | { |
1044 | const char *msg; | |
1045 | int error; | |
1046 | const bool is_enforce = (mode == 3); | |
1047 | ||
1048 | if (!mode) | |
1049 | return 0; | |
1050 | next: | |
7ef61233 TH |
1051 | error = tomoyo_path_acl(domain, operation, filename); |
1052 | msg = tomoyo_path2keyword(operation); | |
b69a54ee KT |
1053 | if (!error) |
1054 | goto ok; | |
1055 | if (tomoyo_verbose_mode(domain)) | |
1056 | printk(KERN_WARNING "TOMOYO-%s: Access '%s %s' denied for %s\n", | |
1057 | tomoyo_get_msg(is_enforce), msg, filename->name, | |
1058 | tomoyo_get_last_name(domain)); | |
1059 | if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { | |
1060 | const char *name = tomoyo_get_file_pattern(filename)->name; | |
7ef61233 | 1061 | tomoyo_update_path_acl(operation, name, domain, false); |
b69a54ee KT |
1062 | } |
1063 | if (!is_enforce) | |
1064 | error = 0; | |
1065 | ok: | |
1066 | /* | |
1067 | * Since "allow_truncate" doesn't imply "allow_rewrite" permission, | |
1068 | * we need to check "allow_rewrite" permission if the filename is | |
1069 | * specified by "deny_rewrite" keyword. | |
1070 | */ | |
7ef61233 | 1071 | if (!error && operation == TOMOYO_TYPE_TRUNCATE && |
b69a54ee | 1072 | tomoyo_is_no_rewrite_file(filename)) { |
7ef61233 | 1073 | operation = TOMOYO_TYPE_REWRITE; |
b69a54ee KT |
1074 | goto next; |
1075 | } | |
1076 | return error; | |
1077 | } | |
1078 | ||
b69a54ee KT |
1079 | /** |
1080 | * tomoyo_check_exec_perm - Check permission for "execute". | |
1081 | * | |
1082 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1083 | * @filename: Check permission for "execute". | |
b69a54ee KT |
1084 | * |
1085 | * Returns 0 on success, negativevalue otherwise. | |
fdb8ebb7 TH |
1086 | * |
1087 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
1088 | */ |
1089 | int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain, | |
bcb86975 | 1090 | const struct tomoyo_path_info *filename) |
b69a54ee KT |
1091 | { |
1092 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1093 | ||
1094 | if (!mode) | |
1095 | return 0; | |
1096 | return tomoyo_check_file_perm2(domain, filename, 1, "do_execve", mode); | |
1097 | } | |
1098 | ||
1099 | /** | |
1100 | * tomoyo_check_open_permission - Check permission for "read" and "write". | |
1101 | * | |
1102 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1103 | * @path: Pointer to "struct path". | |
1104 | * @flag: Flags for open(). | |
1105 | * | |
1106 | * Returns 0 on success, negative value otherwise. | |
1107 | */ | |
1108 | int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, | |
1109 | struct path *path, const int flag) | |
1110 | { | |
1111 | const u8 acc_mode = ACC_MODE(flag); | |
1112 | int error = -ENOMEM; | |
1113 | struct tomoyo_path_info *buf; | |
1114 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1115 | const bool is_enforce = (mode == 3); | |
fdb8ebb7 | 1116 | int idx; |
b69a54ee KT |
1117 | |
1118 | if (!mode || !path->mnt) | |
1119 | return 0; | |
1120 | if (acc_mode == 0) | |
1121 | return 0; | |
1122 | if (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode)) | |
1123 | /* | |
1124 | * I don't check directories here because mkdir() and rmdir() | |
1125 | * don't call me. | |
1126 | */ | |
1127 | return 0; | |
fdb8ebb7 | 1128 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1129 | buf = tomoyo_get_path(path); |
1130 | if (!buf) | |
1131 | goto out; | |
1132 | error = 0; | |
1133 | /* | |
1134 | * If the filename is specified by "deny_rewrite" keyword, | |
1135 | * we need to check "allow_rewrite" permission when the filename is not | |
1136 | * opened for append mode or the filename is truncated at open time. | |
1137 | */ | |
1138 | if ((acc_mode & MAY_WRITE) && | |
1139 | ((flag & O_TRUNC) || !(flag & O_APPEND)) && | |
1140 | (tomoyo_is_no_rewrite_file(buf))) { | |
7ef61233 TH |
1141 | error = tomoyo_path_permission2(domain, TOMOYO_TYPE_REWRITE, |
1142 | buf, mode); | |
b69a54ee KT |
1143 | } |
1144 | if (!error) | |
1145 | error = tomoyo_check_file_perm2(domain, buf, acc_mode, "open", | |
1146 | mode); | |
1147 | if (!error && (flag & O_TRUNC)) | |
7ef61233 TH |
1148 | error = tomoyo_path_permission2(domain, TOMOYO_TYPE_TRUNCATE, |
1149 | buf, mode); | |
b69a54ee | 1150 | out: |
8e2d39a1 | 1151 | kfree(buf); |
fdb8ebb7 | 1152 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1153 | if (!is_enforce) |
1154 | error = 0; | |
1155 | return error; | |
1156 | } | |
1157 | ||
1158 | /** | |
7ef61233 | 1159 | * tomoyo_path_perm - Check permission for "create", "unlink", "mkdir", "rmdir", "mkfifo", "mksock", "mkblock", "mkchar", "truncate", "symlink", "ioctl", "chmod", "chown", "chgrp", "chroot", "mount" and "unmount". |
b69a54ee | 1160 | * |
b69a54ee KT |
1161 | * @operation: Type of operation. |
1162 | * @path: Pointer to "struct path". | |
1163 | * | |
1164 | * Returns 0 on success, negative value otherwise. | |
1165 | */ | |
97d6931e | 1166 | int tomoyo_path_perm(const u8 operation, struct path *path) |
b69a54ee KT |
1167 | { |
1168 | int error = -ENOMEM; | |
1169 | struct tomoyo_path_info *buf; | |
97d6931e | 1170 | struct tomoyo_domain_info *domain = tomoyo_domain(); |
b69a54ee KT |
1171 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); |
1172 | const bool is_enforce = (mode == 3); | |
fdb8ebb7 | 1173 | int idx; |
b69a54ee KT |
1174 | |
1175 | if (!mode || !path->mnt) | |
1176 | return 0; | |
fdb8ebb7 | 1177 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1178 | buf = tomoyo_get_path(path); |
1179 | if (!buf) | |
1180 | goto out; | |
1181 | switch (operation) { | |
7ef61233 TH |
1182 | case TOMOYO_TYPE_MKDIR: |
1183 | case TOMOYO_TYPE_RMDIR: | |
1184 | case TOMOYO_TYPE_CHROOT: | |
b69a54ee KT |
1185 | if (!buf->is_dir) { |
1186 | /* | |
1187 | * tomoyo_get_path() reserves space for appending "/." | |
1188 | */ | |
1189 | strcat((char *) buf->name, "/"); | |
1190 | tomoyo_fill_path_info(buf); | |
1191 | } | |
1192 | } | |
7ef61233 | 1193 | error = tomoyo_path_permission2(domain, operation, buf, mode); |
b69a54ee | 1194 | out: |
8e2d39a1 | 1195 | kfree(buf); |
fdb8ebb7 | 1196 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1197 | if (!is_enforce) |
1198 | error = 0; | |
1199 | return error; | |
1200 | } | |
1201 | ||
1202 | /** | |
1203 | * tomoyo_check_rewrite_permission - Check permission for "rewrite". | |
1204 | * | |
b69a54ee KT |
1205 | * @filp: Pointer to "struct file". |
1206 | * | |
1207 | * Returns 0 on success, negative value otherwise. | |
1208 | */ | |
97d6931e | 1209 | int tomoyo_check_rewrite_permission(struct file *filp) |
b69a54ee KT |
1210 | { |
1211 | int error = -ENOMEM; | |
97d6931e | 1212 | struct tomoyo_domain_info *domain = tomoyo_domain(); |
b69a54ee KT |
1213 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); |
1214 | const bool is_enforce = (mode == 3); | |
1215 | struct tomoyo_path_info *buf; | |
fdb8ebb7 | 1216 | int idx; |
b69a54ee KT |
1217 | |
1218 | if (!mode || !filp->f_path.mnt) | |
1219 | return 0; | |
fdb8ebb7 TH |
1220 | |
1221 | idx = tomoyo_read_lock(); | |
b69a54ee KT |
1222 | buf = tomoyo_get_path(&filp->f_path); |
1223 | if (!buf) | |
1224 | goto out; | |
1225 | if (!tomoyo_is_no_rewrite_file(buf)) { | |
1226 | error = 0; | |
1227 | goto out; | |
1228 | } | |
7ef61233 | 1229 | error = tomoyo_path_permission2(domain, TOMOYO_TYPE_REWRITE, buf, mode); |
b69a54ee | 1230 | out: |
8e2d39a1 | 1231 | kfree(buf); |
fdb8ebb7 | 1232 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1233 | if (!is_enforce) |
1234 | error = 0; | |
1235 | return error; | |
1236 | } | |
1237 | ||
1238 | /** | |
7ef61233 | 1239 | * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root". |
b69a54ee | 1240 | * |
b69a54ee KT |
1241 | * @operation: Type of operation. |
1242 | * @path1: Pointer to "struct path". | |
1243 | * @path2: Pointer to "struct path". | |
1244 | * | |
1245 | * Returns 0 on success, negative value otherwise. | |
1246 | */ | |
97d6931e | 1247 | int tomoyo_path2_perm(const u8 operation, struct path *path1, |
7ef61233 | 1248 | struct path *path2) |
b69a54ee KT |
1249 | { |
1250 | int error = -ENOMEM; | |
1251 | struct tomoyo_path_info *buf1, *buf2; | |
97d6931e | 1252 | struct tomoyo_domain_info *domain = tomoyo_domain(); |
b69a54ee KT |
1253 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); |
1254 | const bool is_enforce = (mode == 3); | |
1255 | const char *msg; | |
fdb8ebb7 | 1256 | int idx; |
b69a54ee KT |
1257 | |
1258 | if (!mode || !path1->mnt || !path2->mnt) | |
1259 | return 0; | |
fdb8ebb7 | 1260 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1261 | buf1 = tomoyo_get_path(path1); |
1262 | buf2 = tomoyo_get_path(path2); | |
1263 | if (!buf1 || !buf2) | |
1264 | goto out; | |
1265 | { | |
1266 | struct dentry *dentry = path1->dentry; | |
1267 | if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) { | |
1268 | /* | |
1269 | * tomoyo_get_path() reserves space for appending "/." | |
1270 | */ | |
1271 | if (!buf1->is_dir) { | |
1272 | strcat((char *) buf1->name, "/"); | |
1273 | tomoyo_fill_path_info(buf1); | |
1274 | } | |
1275 | if (!buf2->is_dir) { | |
1276 | strcat((char *) buf2->name, "/"); | |
1277 | tomoyo_fill_path_info(buf2); | |
1278 | } | |
1279 | } | |
1280 | } | |
7ef61233 TH |
1281 | error = tomoyo_path2_acl(domain, operation, buf1, buf2); |
1282 | msg = tomoyo_path22keyword(operation); | |
b69a54ee KT |
1283 | if (!error) |
1284 | goto out; | |
1285 | if (tomoyo_verbose_mode(domain)) | |
1286 | printk(KERN_WARNING "TOMOYO-%s: Access '%s %s %s' " | |
1287 | "denied for %s\n", tomoyo_get_msg(is_enforce), | |
1288 | msg, buf1->name, buf2->name, | |
1289 | tomoyo_get_last_name(domain)); | |
1290 | if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { | |
1291 | const char *name1 = tomoyo_get_file_pattern(buf1)->name; | |
1292 | const char *name2 = tomoyo_get_file_pattern(buf2)->name; | |
7ef61233 TH |
1293 | tomoyo_update_path2_acl(operation, name1, name2, domain, |
1294 | false); | |
b69a54ee KT |
1295 | } |
1296 | out: | |
8e2d39a1 TH |
1297 | kfree(buf1); |
1298 | kfree(buf2); | |
fdb8ebb7 | 1299 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1300 | if (!is_enforce) |
1301 | error = 0; | |
1302 | return error; | |
1303 | } |