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