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 | { | |
ca0b7df3 | 167 | struct tomoyo_globally_readable_file_entry *entry = NULL; |
b69a54ee KT |
168 | struct tomoyo_globally_readable_file_entry *ptr; |
169 | const struct tomoyo_path_info *saved_filename; | |
ca0b7df3 | 170 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 171 | |
17080008 | 172 | if (!tomoyo_is_correct_path(filename, 1, 0, -1)) |
b69a54ee | 173 | return -EINVAL; |
bf24fb01 | 174 | saved_filename = tomoyo_get_name(filename); |
b69a54ee KT |
175 | if (!saved_filename) |
176 | return -ENOMEM; | |
ca0b7df3 | 177 | if (!is_delete) |
4e5d6f7e | 178 | entry = kmalloc(sizeof(*entry), GFP_NOFS); |
29282381 TH |
179 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
180 | goto out; | |
fdb8ebb7 | 181 | list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { |
b69a54ee KT |
182 | if (ptr->filename != saved_filename) |
183 | continue; | |
184 | ptr->is_deleted = is_delete; | |
185 | error = 0; | |
ca0b7df3 | 186 | break; |
b69a54ee | 187 | } |
ca0b7df3 TH |
188 | if (!is_delete && error && tomoyo_memory_ok(entry)) { |
189 | entry->filename = saved_filename; | |
bf24fb01 | 190 | saved_filename = NULL; |
ca0b7df3 TH |
191 | list_add_tail_rcu(&entry->list, &tomoyo_globally_readable_list); |
192 | entry = NULL; | |
193 | error = 0; | |
b69a54ee | 194 | } |
f737d95d | 195 | mutex_unlock(&tomoyo_policy_lock); |
29282381 | 196 | out: |
bf24fb01 | 197 | tomoyo_put_name(saved_filename); |
ca0b7df3 | 198 | kfree(entry); |
b69a54ee KT |
199 | return error; |
200 | } | |
201 | ||
202 | /** | |
203 | * tomoyo_is_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading. | |
204 | * | |
205 | * @filename: The filename to check. | |
206 | * | |
207 | * Returns true if any domain can open @filename for reading, false otherwise. | |
fdb8ebb7 TH |
208 | * |
209 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
210 | */ |
211 | static bool tomoyo_is_globally_readable_file(const struct tomoyo_path_info * | |
212 | filename) | |
213 | { | |
214 | struct tomoyo_globally_readable_file_entry *ptr; | |
215 | bool found = false; | |
fdb8ebb7 TH |
216 | |
217 | list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { | |
b69a54ee KT |
218 | if (!ptr->is_deleted && |
219 | tomoyo_path_matches_pattern(filename, ptr->filename)) { | |
220 | found = true; | |
221 | break; | |
222 | } | |
223 | } | |
b69a54ee KT |
224 | return found; |
225 | } | |
226 | ||
227 | /** | |
228 | * tomoyo_write_globally_readable_policy - Write "struct tomoyo_globally_readable_file_entry" list. | |
229 | * | |
230 | * @data: String to parse. | |
231 | * @is_delete: True if it is a delete request. | |
232 | * | |
233 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
234 | * |
235 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
236 | */ |
237 | int tomoyo_write_globally_readable_policy(char *data, const bool is_delete) | |
238 | { | |
239 | return tomoyo_update_globally_readable_entry(data, is_delete); | |
240 | } | |
241 | ||
242 | /** | |
243 | * tomoyo_read_globally_readable_policy - Read "struct tomoyo_globally_readable_file_entry" list. | |
244 | * | |
245 | * @head: Pointer to "struct tomoyo_io_buffer". | |
246 | * | |
247 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
248 | * |
249 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
250 | */ |
251 | bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head) | |
252 | { | |
253 | struct list_head *pos; | |
254 | bool done = true; | |
255 | ||
b69a54ee KT |
256 | list_for_each_cookie(pos, head->read_var2, |
257 | &tomoyo_globally_readable_list) { | |
258 | struct tomoyo_globally_readable_file_entry *ptr; | |
259 | ptr = list_entry(pos, | |
260 | struct tomoyo_globally_readable_file_entry, | |
261 | list); | |
262 | if (ptr->is_deleted) | |
263 | continue; | |
7d2948b1 TH |
264 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_READ "%s\n", |
265 | ptr->filename->name); | |
266 | if (!done) | |
b69a54ee | 267 | break; |
b69a54ee | 268 | } |
b69a54ee KT |
269 | return done; |
270 | } | |
271 | ||
c3fa109a TH |
272 | /* tomoyo_pattern_list is used for holding list of pathnames which are used for |
273 | * converting pathnames to pathname patterns during learning mode. | |
274 | * | |
275 | * An entry is added by | |
276 | * | |
277 | * # echo 'file_pattern /proc/\$/mounts' > \ | |
278 | * /sys/kernel/security/tomoyo/exception_policy | |
279 | * | |
280 | * and is deleted by | |
281 | * | |
282 | * # echo 'delete file_pattern /proc/\$/mounts' > \ | |
283 | * /sys/kernel/security/tomoyo/exception_policy | |
284 | * | |
285 | * and all entries are retrieved by | |
286 | * | |
287 | * # grep ^file_pattern /sys/kernel/security/tomoyo/exception_policy | |
288 | * | |
289 | * In the example above, if a process which belongs to a domain which is in | |
290 | * learning mode requested open("/proc/1/mounts", O_RDONLY), | |
291 | * "allow_read /proc/\$/mounts" is automatically added to the domain which that | |
292 | * process belongs to. | |
293 | * | |
294 | * It is not a desirable behavior that we have to use /proc/\$/ instead of | |
295 | * /proc/self/ when current process needs to access only current process's | |
296 | * information. As of now, LSM version of TOMOYO is using __d_path() for | |
297 | * calculating pathname. Non LSM version of TOMOYO is using its own function | |
298 | * which pretends as if /proc/self/ is not a symlink; so that we can forbid | |
299 | * current process from accessing other process's information. | |
300 | */ | |
847b173e | 301 | LIST_HEAD(tomoyo_pattern_list); |
b69a54ee KT |
302 | |
303 | /** | |
304 | * tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list. | |
305 | * | |
306 | * @pattern: Pathname pattern. | |
307 | * @is_delete: True if it is a delete request. | |
308 | * | |
309 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
310 | * |
311 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
312 | */ |
313 | static int tomoyo_update_file_pattern_entry(const char *pattern, | |
314 | const bool is_delete) | |
315 | { | |
ca0b7df3 | 316 | struct tomoyo_pattern_entry *entry = NULL; |
b69a54ee KT |
317 | struct tomoyo_pattern_entry *ptr; |
318 | const struct tomoyo_path_info *saved_pattern; | |
ca0b7df3 | 319 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 320 | |
bf24fb01 | 321 | saved_pattern = tomoyo_get_name(pattern); |
b69a54ee | 322 | if (!saved_pattern) |
ca0b7df3 TH |
323 | return error; |
324 | if (!saved_pattern->is_patterned) | |
325 | goto out; | |
326 | if (!is_delete) | |
4e5d6f7e | 327 | entry = kmalloc(sizeof(*entry), GFP_NOFS); |
29282381 TH |
328 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
329 | goto out; | |
fdb8ebb7 | 330 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { |
b69a54ee KT |
331 | if (saved_pattern != ptr->pattern) |
332 | continue; | |
333 | ptr->is_deleted = is_delete; | |
334 | error = 0; | |
ca0b7df3 | 335 | break; |
b69a54ee | 336 | } |
ca0b7df3 TH |
337 | if (!is_delete && error && tomoyo_memory_ok(entry)) { |
338 | entry->pattern = saved_pattern; | |
bf24fb01 | 339 | saved_pattern = NULL; |
ca0b7df3 TH |
340 | list_add_tail_rcu(&entry->list, &tomoyo_pattern_list); |
341 | entry = NULL; | |
342 | error = 0; | |
b69a54ee | 343 | } |
f737d95d | 344 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 TH |
345 | out: |
346 | kfree(entry); | |
bf24fb01 | 347 | tomoyo_put_name(saved_pattern); |
b69a54ee KT |
348 | return error; |
349 | } | |
350 | ||
351 | /** | |
352 | * tomoyo_get_file_pattern - Get patterned pathname. | |
353 | * | |
354 | * @filename: The filename to find patterned pathname. | |
355 | * | |
356 | * Returns pointer to pathname pattern if matched, @filename otherwise. | |
fdb8ebb7 TH |
357 | * |
358 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
359 | */ |
360 | static const struct tomoyo_path_info * | |
361 | tomoyo_get_file_pattern(const struct tomoyo_path_info *filename) | |
362 | { | |
363 | struct tomoyo_pattern_entry *ptr; | |
364 | const struct tomoyo_path_info *pattern = NULL; | |
365 | ||
fdb8ebb7 | 366 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { |
b69a54ee KT |
367 | if (ptr->is_deleted) |
368 | continue; | |
369 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
370 | continue; | |
371 | pattern = ptr->pattern; | |
372 | if (tomoyo_strendswith(pattern->name, "/\\*")) { | |
373 | /* Do nothing. Try to find the better match. */ | |
374 | } else { | |
375 | /* This would be the better match. Use this. */ | |
376 | break; | |
377 | } | |
378 | } | |
b69a54ee KT |
379 | if (pattern) |
380 | filename = pattern; | |
381 | return filename; | |
382 | } | |
383 | ||
384 | /** | |
385 | * tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list. | |
386 | * | |
387 | * @data: String to parse. | |
388 | * @is_delete: True if it is a delete request. | |
389 | * | |
390 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
391 | * |
392 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
393 | */ |
394 | int tomoyo_write_pattern_policy(char *data, const bool is_delete) | |
395 | { | |
396 | return tomoyo_update_file_pattern_entry(data, is_delete); | |
397 | } | |
398 | ||
399 | /** | |
400 | * tomoyo_read_file_pattern - Read "struct tomoyo_pattern_entry" list. | |
401 | * | |
402 | * @head: Pointer to "struct tomoyo_io_buffer". | |
403 | * | |
404 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
405 | * |
406 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
407 | */ |
408 | bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head) | |
409 | { | |
410 | struct list_head *pos; | |
411 | bool done = true; | |
412 | ||
b69a54ee KT |
413 | list_for_each_cookie(pos, head->read_var2, &tomoyo_pattern_list) { |
414 | struct tomoyo_pattern_entry *ptr; | |
415 | ptr = list_entry(pos, struct tomoyo_pattern_entry, list); | |
416 | if (ptr->is_deleted) | |
417 | continue; | |
7d2948b1 TH |
418 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_FILE_PATTERN |
419 | "%s\n", ptr->pattern->name); | |
420 | if (!done) | |
b69a54ee | 421 | break; |
b69a54ee | 422 | } |
b69a54ee KT |
423 | return done; |
424 | } | |
425 | ||
c3fa109a TH |
426 | /* |
427 | * tomoyo_no_rewrite_list is used for holding list of pathnames which are by | |
428 | * default forbidden to modify already written content of a file. | |
429 | * | |
430 | * An entry is added by | |
431 | * | |
432 | * # echo 'deny_rewrite /var/log/messages' > \ | |
433 | * /sys/kernel/security/tomoyo/exception_policy | |
434 | * | |
435 | * and is deleted by | |
436 | * | |
437 | * # echo 'delete deny_rewrite /var/log/messages' > \ | |
438 | * /sys/kernel/security/tomoyo/exception_policy | |
439 | * | |
440 | * and all entries are retrieved by | |
441 | * | |
442 | * # grep ^deny_rewrite /sys/kernel/security/tomoyo/exception_policy | |
443 | * | |
444 | * In the example above, if a process requested to rewrite /var/log/messages , | |
445 | * the process can't rewrite unless the domain which that process belongs to | |
446 | * has "allow_rewrite /var/log/messages" entry. | |
447 | * | |
448 | * It is not a desirable behavior that we have to add "\040(deleted)" suffix | |
449 | * when we want to allow rewriting already unlink()ed file. As of now, | |
450 | * LSM version of TOMOYO is using __d_path() for calculating pathname. | |
451 | * Non LSM version of TOMOYO is using its own function which doesn't append | |
452 | * " (deleted)" suffix if the file is already unlink()ed; so that we don't | |
453 | * need to worry whether the file is already unlink()ed or not. | |
454 | */ | |
847b173e | 455 | LIST_HEAD(tomoyo_no_rewrite_list); |
b69a54ee KT |
456 | |
457 | /** | |
458 | * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list. | |
459 | * | |
460 | * @pattern: Pathname pattern that are not rewritable by default. | |
461 | * @is_delete: True if it is a delete request. | |
462 | * | |
463 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
464 | * |
465 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
466 | */ |
467 | static int tomoyo_update_no_rewrite_entry(const char *pattern, | |
468 | const bool is_delete) | |
469 | { | |
ca0b7df3 TH |
470 | struct tomoyo_no_rewrite_entry *entry = NULL; |
471 | struct tomoyo_no_rewrite_entry *ptr; | |
b69a54ee | 472 | const struct tomoyo_path_info *saved_pattern; |
ca0b7df3 | 473 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 474 | |
17080008 | 475 | if (!tomoyo_is_correct_path(pattern, 0, 0, 0)) |
b69a54ee | 476 | return -EINVAL; |
bf24fb01 | 477 | saved_pattern = tomoyo_get_name(pattern); |
b69a54ee | 478 | if (!saved_pattern) |
ca0b7df3 TH |
479 | return error; |
480 | if (!is_delete) | |
4e5d6f7e | 481 | entry = kmalloc(sizeof(*entry), GFP_NOFS); |
29282381 TH |
482 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
483 | goto out; | |
fdb8ebb7 | 484 | list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { |
b69a54ee KT |
485 | if (ptr->pattern != saved_pattern) |
486 | continue; | |
487 | ptr->is_deleted = is_delete; | |
488 | error = 0; | |
ca0b7df3 | 489 | break; |
b69a54ee | 490 | } |
ca0b7df3 TH |
491 | if (!is_delete && error && tomoyo_memory_ok(entry)) { |
492 | entry->pattern = saved_pattern; | |
bf24fb01 | 493 | saved_pattern = NULL; |
ca0b7df3 TH |
494 | list_add_tail_rcu(&entry->list, &tomoyo_no_rewrite_list); |
495 | entry = NULL; | |
496 | error = 0; | |
b69a54ee | 497 | } |
f737d95d | 498 | mutex_unlock(&tomoyo_policy_lock); |
29282381 | 499 | out: |
bf24fb01 | 500 | tomoyo_put_name(saved_pattern); |
ca0b7df3 | 501 | kfree(entry); |
b69a54ee KT |
502 | return error; |
503 | } | |
504 | ||
505 | /** | |
506 | * tomoyo_is_no_rewrite_file - Check if the given pathname is not permitted to be rewrited. | |
507 | * | |
508 | * @filename: Filename to check. | |
509 | * | |
510 | * Returns true if @filename is specified by "deny_rewrite" directive, | |
511 | * false otherwise. | |
fdb8ebb7 TH |
512 | * |
513 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
514 | */ |
515 | static bool tomoyo_is_no_rewrite_file(const struct tomoyo_path_info *filename) | |
516 | { | |
517 | struct tomoyo_no_rewrite_entry *ptr; | |
518 | bool found = false; | |
519 | ||
fdb8ebb7 | 520 | list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { |
b69a54ee KT |
521 | if (ptr->is_deleted) |
522 | continue; | |
523 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
524 | continue; | |
525 | found = true; | |
526 | break; | |
527 | } | |
b69a54ee KT |
528 | return found; |
529 | } | |
530 | ||
531 | /** | |
532 | * tomoyo_write_no_rewrite_policy - Write "struct tomoyo_no_rewrite_entry" list. | |
533 | * | |
534 | * @data: String to parse. | |
535 | * @is_delete: True if it is a delete request. | |
536 | * | |
537 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
538 | * |
539 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
540 | */ |
541 | int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete) | |
542 | { | |
543 | return tomoyo_update_no_rewrite_entry(data, is_delete); | |
544 | } | |
545 | ||
546 | /** | |
547 | * tomoyo_read_no_rewrite_policy - Read "struct tomoyo_no_rewrite_entry" list. | |
548 | * | |
549 | * @head: Pointer to "struct tomoyo_io_buffer". | |
550 | * | |
551 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
552 | * |
553 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
554 | */ |
555 | bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head) | |
556 | { | |
557 | struct list_head *pos; | |
558 | bool done = true; | |
559 | ||
b69a54ee KT |
560 | list_for_each_cookie(pos, head->read_var2, &tomoyo_no_rewrite_list) { |
561 | struct tomoyo_no_rewrite_entry *ptr; | |
562 | ptr = list_entry(pos, struct tomoyo_no_rewrite_entry, list); | |
563 | if (ptr->is_deleted) | |
564 | continue; | |
7d2948b1 TH |
565 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_DENY_REWRITE |
566 | "%s\n", ptr->pattern->name); | |
567 | if (!done) | |
b69a54ee | 568 | break; |
b69a54ee | 569 | } |
b69a54ee KT |
570 | return done; |
571 | } | |
572 | ||
573 | /** | |
574 | * tomoyo_update_file_acl - Update file's read/write/execute ACL. | |
575 | * | |
576 | * @filename: Filename. | |
577 | * @perm: Permission (between 1 to 7). | |
578 | * @domain: Pointer to "struct tomoyo_domain_info". | |
579 | * @is_delete: True if it is a delete request. | |
580 | * | |
581 | * Returns 0 on success, negative value otherwise. | |
582 | * | |
583 | * This is legacy support interface for older policy syntax. | |
584 | * Current policy syntax uses "allow_read/write" instead of "6", | |
585 | * "allow_read" instead of "4", "allow_write" instead of "2", | |
586 | * "allow_execute" instead of "1". | |
fdb8ebb7 TH |
587 | * |
588 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
589 | */ |
590 | static int tomoyo_update_file_acl(const char *filename, u8 perm, | |
591 | struct tomoyo_domain_info * const domain, | |
592 | const bool is_delete) | |
593 | { | |
594 | if (perm > 7 || !perm) { | |
595 | printk(KERN_DEBUG "%s: Invalid permission '%d %s'\n", | |
596 | __func__, perm, filename); | |
597 | return -EINVAL; | |
598 | } | |
599 | if (filename[0] != '@' && tomoyo_strendswith(filename, "/")) | |
600 | /* | |
601 | * Only 'allow_mkdir' and 'allow_rmdir' are valid for | |
602 | * directory permissions. | |
603 | */ | |
604 | return 0; | |
605 | if (perm & 4) | |
7ef61233 TH |
606 | tomoyo_update_path_acl(TOMOYO_TYPE_READ, filename, domain, |
607 | is_delete); | |
b69a54ee | 608 | if (perm & 2) |
7ef61233 TH |
609 | tomoyo_update_path_acl(TOMOYO_TYPE_WRITE, filename, domain, |
610 | is_delete); | |
b69a54ee | 611 | if (perm & 1) |
7ef61233 TH |
612 | tomoyo_update_path_acl(TOMOYO_TYPE_EXECUTE, filename, domain, |
613 | is_delete); | |
b69a54ee KT |
614 | return 0; |
615 | } | |
616 | ||
617 | /** | |
7ef61233 | 618 | * tomoyo_path_acl2 - Check permission for single path operation. |
b69a54ee KT |
619 | * |
620 | * @domain: Pointer to "struct tomoyo_domain_info". | |
621 | * @filename: Filename to check. | |
622 | * @perm: Permission. | |
623 | * @may_use_pattern: True if patterned ACL is permitted. | |
624 | * | |
625 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
626 | * |
627 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 628 | */ |
7ef61233 TH |
629 | static int tomoyo_path_acl2(const struct tomoyo_domain_info *domain, |
630 | const struct tomoyo_path_info *filename, | |
631 | const u32 perm, const bool may_use_pattern) | |
b69a54ee KT |
632 | { |
633 | struct tomoyo_acl_info *ptr; | |
634 | int error = -EPERM; | |
635 | ||
fdb8ebb7 | 636 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
637 | struct tomoyo_path_acl *acl; |
638 | if (ptr->type != TOMOYO_TYPE_PATH_ACL) | |
b69a54ee | 639 | continue; |
7ef61233 | 640 | acl = container_of(ptr, struct tomoyo_path_acl, head); |
937bf613 TH |
641 | if (perm <= 0xFFFF) { |
642 | if (!(acl->perm & perm)) | |
643 | continue; | |
644 | } else { | |
645 | if (!(acl->perm_high & (perm >> 16))) | |
646 | continue; | |
647 | } | |
b69a54ee KT |
648 | if (may_use_pattern || !acl->filename->is_patterned) { |
649 | if (!tomoyo_path_matches_pattern(filename, | |
650 | acl->filename)) | |
651 | continue; | |
652 | } else { | |
653 | continue; | |
654 | } | |
655 | error = 0; | |
656 | break; | |
657 | } | |
b69a54ee KT |
658 | return error; |
659 | } | |
660 | ||
661 | /** | |
662 | * tomoyo_check_file_acl - Check permission for opening files. | |
663 | * | |
664 | * @domain: Pointer to "struct tomoyo_domain_info". | |
665 | * @filename: Filename to check. | |
666 | * @operation: Mode ("read" or "write" or "read/write" or "execute"). | |
667 | * | |
668 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
669 | * |
670 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
671 | */ |
672 | static int tomoyo_check_file_acl(const struct tomoyo_domain_info *domain, | |
673 | const struct tomoyo_path_info *filename, | |
674 | const u8 operation) | |
675 | { | |
937bf613 | 676 | u32 perm = 0; |
b69a54ee KT |
677 | |
678 | if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) | |
679 | return 0; | |
680 | if (operation == 6) | |
7ef61233 | 681 | perm = 1 << TOMOYO_TYPE_READ_WRITE; |
b69a54ee | 682 | else if (operation == 4) |
7ef61233 | 683 | perm = 1 << TOMOYO_TYPE_READ; |
b69a54ee | 684 | else if (operation == 2) |
7ef61233 | 685 | perm = 1 << TOMOYO_TYPE_WRITE; |
b69a54ee | 686 | else if (operation == 1) |
7ef61233 | 687 | perm = 1 << TOMOYO_TYPE_EXECUTE; |
b69a54ee KT |
688 | else |
689 | BUG(); | |
7ef61233 | 690 | return tomoyo_path_acl2(domain, filename, perm, operation != 1); |
b69a54ee KT |
691 | } |
692 | ||
693 | /** | |
694 | * tomoyo_check_file_perm2 - Check permission for opening files. | |
695 | * | |
696 | * @domain: Pointer to "struct tomoyo_domain_info". | |
697 | * @filename: Filename to check. | |
698 | * @perm: Mode ("read" or "write" or "read/write" or "execute"). | |
699 | * @operation: Operation name passed used for verbose mode. | |
700 | * @mode: Access control mode. | |
701 | * | |
702 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
703 | * |
704 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
705 | */ |
706 | static int tomoyo_check_file_perm2(struct tomoyo_domain_info * const domain, | |
707 | const struct tomoyo_path_info *filename, | |
708 | const u8 perm, const char *operation, | |
709 | const u8 mode) | |
710 | { | |
711 | const bool is_enforce = (mode == 3); | |
712 | const char *msg = "<unknown>"; | |
713 | int error = 0; | |
714 | ||
715 | if (!filename) | |
716 | return 0; | |
717 | error = tomoyo_check_file_acl(domain, filename, perm); | |
ea13ddba | 718 | if (error && perm == 4 && !domain->ignore_global_allow_read |
b69a54ee KT |
719 | && tomoyo_is_globally_readable_file(filename)) |
720 | error = 0; | |
721 | if (perm == 6) | |
7ef61233 | 722 | msg = tomoyo_path2keyword(TOMOYO_TYPE_READ_WRITE); |
b69a54ee | 723 | else if (perm == 4) |
7ef61233 | 724 | msg = tomoyo_path2keyword(TOMOYO_TYPE_READ); |
b69a54ee | 725 | else if (perm == 2) |
7ef61233 | 726 | msg = tomoyo_path2keyword(TOMOYO_TYPE_WRITE); |
b69a54ee | 727 | else if (perm == 1) |
7ef61233 | 728 | msg = tomoyo_path2keyword(TOMOYO_TYPE_EXECUTE); |
b69a54ee KT |
729 | else |
730 | BUG(); | |
731 | if (!error) | |
732 | return 0; | |
733 | if (tomoyo_verbose_mode(domain)) | |
734 | printk(KERN_WARNING "TOMOYO-%s: Access '%s(%s) %s' denied " | |
735 | "for %s\n", tomoyo_get_msg(is_enforce), msg, operation, | |
736 | filename->name, tomoyo_get_last_name(domain)); | |
737 | if (is_enforce) | |
738 | return error; | |
739 | if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { | |
740 | /* Don't use patterns for execute permission. */ | |
741 | const struct tomoyo_path_info *patterned_file = (perm != 1) ? | |
742 | tomoyo_get_file_pattern(filename) : filename; | |
743 | tomoyo_update_file_acl(patterned_file->name, perm, | |
744 | domain, false); | |
745 | } | |
746 | return 0; | |
747 | } | |
748 | ||
749 | /** | |
750 | * tomoyo_write_file_policy - Update file related list. | |
751 | * | |
752 | * @data: String to parse. | |
753 | * @domain: Pointer to "struct tomoyo_domain_info". | |
754 | * @is_delete: True if it is a delete request. | |
755 | * | |
756 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
757 | * |
758 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
759 | */ |
760 | int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, | |
761 | const bool is_delete) | |
762 | { | |
763 | char *filename = strchr(data, ' '); | |
764 | char *filename2; | |
765 | unsigned int perm; | |
766 | u8 type; | |
767 | ||
768 | if (!filename) | |
769 | return -EINVAL; | |
770 | *filename++ = '\0'; | |
771 | if (sscanf(data, "%u", &perm) == 1) | |
772 | return tomoyo_update_file_acl(filename, (u8) perm, domain, | |
773 | is_delete); | |
774 | if (strncmp(data, "allow_", 6)) | |
775 | goto out; | |
776 | data += 6; | |
7ef61233 TH |
777 | for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) { |
778 | if (strcmp(data, tomoyo_path_keyword[type])) | |
b69a54ee | 779 | continue; |
7ef61233 TH |
780 | return tomoyo_update_path_acl(type, filename, domain, |
781 | is_delete); | |
b69a54ee KT |
782 | } |
783 | filename2 = strchr(filename, ' '); | |
784 | if (!filename2) | |
785 | goto out; | |
786 | *filename2++ = '\0'; | |
7ef61233 TH |
787 | for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) { |
788 | if (strcmp(data, tomoyo_path2_keyword[type])) | |
b69a54ee | 789 | continue; |
7ef61233 TH |
790 | return tomoyo_update_path2_acl(type, filename, filename2, |
791 | domain, is_delete); | |
b69a54ee KT |
792 | } |
793 | out: | |
794 | return -EINVAL; | |
795 | } | |
796 | ||
797 | /** | |
7ef61233 | 798 | * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list. |
b69a54ee KT |
799 | * |
800 | * @type: Type of operation. | |
801 | * @filename: Filename. | |
802 | * @domain: Pointer to "struct tomoyo_domain_info". | |
803 | * @is_delete: True if it is a delete request. | |
804 | * | |
805 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
806 | * |
807 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 808 | */ |
7ef61233 TH |
809 | static int tomoyo_update_path_acl(const u8 type, const char *filename, |
810 | struct tomoyo_domain_info *const domain, | |
811 | const bool is_delete) | |
b69a54ee | 812 | { |
937bf613 | 813 | static const u32 rw_mask = |
7ef61233 | 814 | (1 << TOMOYO_TYPE_READ) | (1 << TOMOYO_TYPE_WRITE); |
b69a54ee KT |
815 | const struct tomoyo_path_info *saved_filename; |
816 | struct tomoyo_acl_info *ptr; | |
7ef61233 | 817 | struct tomoyo_path_acl *entry = NULL; |
ca0b7df3 | 818 | int error = is_delete ? -ENOENT : -ENOMEM; |
937bf613 | 819 | const u32 perm = 1 << type; |
b69a54ee KT |
820 | |
821 | if (!domain) | |
822 | return -EINVAL; | |
17080008 | 823 | if (!tomoyo_is_correct_path(filename, 0, 0, 0)) |
b69a54ee | 824 | return -EINVAL; |
bf24fb01 | 825 | saved_filename = tomoyo_get_name(filename); |
b69a54ee KT |
826 | if (!saved_filename) |
827 | return -ENOMEM; | |
ca0b7df3 | 828 | if (!is_delete) |
4e5d6f7e | 829 | entry = kmalloc(sizeof(*entry), GFP_NOFS); |
29282381 TH |
830 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
831 | goto out; | |
fdb8ebb7 | 832 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
833 | struct tomoyo_path_acl *acl = |
834 | container_of(ptr, struct tomoyo_path_acl, head); | |
835 | if (ptr->type != TOMOYO_TYPE_PATH_ACL) | |
b69a54ee | 836 | continue; |
b69a54ee KT |
837 | if (acl->filename != saved_filename) |
838 | continue; | |
ca0b7df3 TH |
839 | if (is_delete) { |
840 | if (perm <= 0xFFFF) | |
841 | acl->perm &= ~perm; | |
842 | else | |
843 | acl->perm_high &= ~(perm >> 16); | |
844 | if ((acl->perm & rw_mask) != rw_mask) | |
7ef61233 TH |
845 | acl->perm &= ~(1 << TOMOYO_TYPE_READ_WRITE); |
846 | else if (!(acl->perm & (1 << TOMOYO_TYPE_READ_WRITE))) | |
ca0b7df3 TH |
847 | acl->perm &= ~rw_mask; |
848 | } else { | |
849 | if (perm <= 0xFFFF) | |
850 | acl->perm |= perm; | |
851 | else | |
852 | acl->perm_high |= (perm >> 16); | |
853 | if ((acl->perm & rw_mask) == rw_mask) | |
7ef61233 TH |
854 | acl->perm |= 1 << TOMOYO_TYPE_READ_WRITE; |
855 | else if (acl->perm & (1 << TOMOYO_TYPE_READ_WRITE)) | |
ca0b7df3 TH |
856 | acl->perm |= rw_mask; |
857 | } | |
b69a54ee | 858 | error = 0; |
ca0b7df3 | 859 | break; |
cd7bec6a | 860 | } |
ca0b7df3 | 861 | if (!is_delete && error && tomoyo_memory_ok(entry)) { |
7ef61233 | 862 | entry->head.type = TOMOYO_TYPE_PATH_ACL; |
937bf613 | 863 | if (perm <= 0xFFFF) |
ca0b7df3 | 864 | entry->perm = perm; |
937bf613 | 865 | else |
ca0b7df3 | 866 | entry->perm_high = (perm >> 16); |
7ef61233 | 867 | if (perm == (1 << TOMOYO_TYPE_READ_WRITE)) |
ca0b7df3 TH |
868 | entry->perm |= rw_mask; |
869 | entry->filename = saved_filename; | |
bf24fb01 | 870 | saved_filename = NULL; |
ca0b7df3 TH |
871 | list_add_tail_rcu(&entry->head.list, &domain->acl_info_list); |
872 | entry = NULL; | |
b69a54ee | 873 | error = 0; |
b69a54ee | 874 | } |
f737d95d | 875 | mutex_unlock(&tomoyo_policy_lock); |
29282381 | 876 | out: |
ca0b7df3 | 877 | kfree(entry); |
bf24fb01 | 878 | tomoyo_put_name(saved_filename); |
b69a54ee KT |
879 | return error; |
880 | } | |
881 | ||
882 | /** | |
7ef61233 | 883 | * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list. |
b69a54ee KT |
884 | * |
885 | * @type: Type of operation. | |
886 | * @filename1: First filename. | |
887 | * @filename2: Second filename. | |
888 | * @domain: Pointer to "struct tomoyo_domain_info". | |
889 | * @is_delete: True if it is a delete request. | |
890 | * | |
891 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
892 | * |
893 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 894 | */ |
7ef61233 TH |
895 | static int tomoyo_update_path2_acl(const u8 type, const char *filename1, |
896 | const char *filename2, | |
897 | struct tomoyo_domain_info *const domain, | |
898 | const bool is_delete) | |
b69a54ee KT |
899 | { |
900 | const struct tomoyo_path_info *saved_filename1; | |
901 | const struct tomoyo_path_info *saved_filename2; | |
902 | struct tomoyo_acl_info *ptr; | |
7ef61233 | 903 | struct tomoyo_path2_acl *entry = NULL; |
ca0b7df3 | 904 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee KT |
905 | const u8 perm = 1 << type; |
906 | ||
907 | if (!domain) | |
908 | return -EINVAL; | |
17080008 TH |
909 | if (!tomoyo_is_correct_path(filename1, 0, 0, 0) || |
910 | !tomoyo_is_correct_path(filename2, 0, 0, 0)) | |
b69a54ee | 911 | return -EINVAL; |
bf24fb01 TH |
912 | saved_filename1 = tomoyo_get_name(filename1); |
913 | saved_filename2 = tomoyo_get_name(filename2); | |
b69a54ee | 914 | if (!saved_filename1 || !saved_filename2) |
ca0b7df3 TH |
915 | goto out; |
916 | if (!is_delete) | |
4e5d6f7e | 917 | entry = kmalloc(sizeof(*entry), GFP_NOFS); |
29282381 TH |
918 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
919 | goto out; | |
fdb8ebb7 | 920 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
921 | struct tomoyo_path2_acl *acl = |
922 | container_of(ptr, struct tomoyo_path2_acl, head); | |
923 | if (ptr->type != TOMOYO_TYPE_PATH2_ACL) | |
b69a54ee | 924 | continue; |
b69a54ee KT |
925 | if (acl->filename1 != saved_filename1 || |
926 | acl->filename2 != saved_filename2) | |
927 | continue; | |
ca0b7df3 TH |
928 | if (is_delete) |
929 | acl->perm &= ~perm; | |
930 | else | |
931 | acl->perm |= perm; | |
b69a54ee | 932 | error = 0; |
ca0b7df3 | 933 | break; |
cd7bec6a | 934 | } |
ca0b7df3 | 935 | if (!is_delete && error && tomoyo_memory_ok(entry)) { |
7ef61233 | 936 | entry->head.type = TOMOYO_TYPE_PATH2_ACL; |
ca0b7df3 TH |
937 | entry->perm = perm; |
938 | entry->filename1 = saved_filename1; | |
bf24fb01 | 939 | saved_filename1 = NULL; |
ca0b7df3 | 940 | entry->filename2 = saved_filename2; |
bf24fb01 | 941 | saved_filename2 = NULL; |
ca0b7df3 TH |
942 | list_add_tail_rcu(&entry->head.list, &domain->acl_info_list); |
943 | entry = NULL; | |
b69a54ee | 944 | error = 0; |
b69a54ee | 945 | } |
f737d95d | 946 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 947 | out: |
bf24fb01 TH |
948 | tomoyo_put_name(saved_filename1); |
949 | tomoyo_put_name(saved_filename2); | |
ca0b7df3 | 950 | kfree(entry); |
b69a54ee KT |
951 | return error; |
952 | } | |
953 | ||
954 | /** | |
7ef61233 | 955 | * tomoyo_path_acl - Check permission for single path operation. |
b69a54ee KT |
956 | * |
957 | * @domain: Pointer to "struct tomoyo_domain_info". | |
958 | * @type: Type of operation. | |
959 | * @filename: Filename to check. | |
960 | * | |
961 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
962 | * |
963 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 964 | */ |
7ef61233 TH |
965 | static int tomoyo_path_acl(struct tomoyo_domain_info *domain, const u8 type, |
966 | const struct tomoyo_path_info *filename) | |
b69a54ee KT |
967 | { |
968 | if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) | |
969 | return 0; | |
7ef61233 | 970 | return tomoyo_path_acl2(domain, filename, 1 << type, 1); |
b69a54ee KT |
971 | } |
972 | ||
973 | /** | |
7ef61233 | 974 | * tomoyo_path2_acl - Check permission for double path operation. |
b69a54ee KT |
975 | * |
976 | * @domain: Pointer to "struct tomoyo_domain_info". | |
977 | * @type: Type of operation. | |
978 | * @filename1: First filename to check. | |
979 | * @filename2: Second filename to check. | |
980 | * | |
981 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
982 | * |
983 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 984 | */ |
7ef61233 TH |
985 | static int tomoyo_path2_acl(const struct tomoyo_domain_info *domain, |
986 | const u8 type, | |
987 | const struct tomoyo_path_info *filename1, | |
988 | const struct tomoyo_path_info *filename2) | |
b69a54ee KT |
989 | { |
990 | struct tomoyo_acl_info *ptr; | |
991 | const u8 perm = 1 << type; | |
992 | int error = -EPERM; | |
993 | ||
994 | if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) | |
995 | return 0; | |
fdb8ebb7 | 996 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
997 | struct tomoyo_path2_acl *acl; |
998 | if (ptr->type != TOMOYO_TYPE_PATH2_ACL) | |
b69a54ee | 999 | continue; |
7ef61233 | 1000 | acl = container_of(ptr, struct tomoyo_path2_acl, head); |
b69a54ee KT |
1001 | if (!(acl->perm & perm)) |
1002 | continue; | |
1003 | if (!tomoyo_path_matches_pattern(filename1, acl->filename1)) | |
1004 | continue; | |
1005 | if (!tomoyo_path_matches_pattern(filename2, acl->filename2)) | |
1006 | continue; | |
1007 | error = 0; | |
1008 | break; | |
1009 | } | |
b69a54ee KT |
1010 | return error; |
1011 | } | |
1012 | ||
1013 | /** | |
7ef61233 | 1014 | * tomoyo_path_permission2 - Check permission for single path operation. |
b69a54ee KT |
1015 | * |
1016 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1017 | * @operation: Type of operation. | |
1018 | * @filename: Filename to check. | |
1019 | * @mode: Access control mode. | |
1020 | * | |
1021 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1022 | * |
1023 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 1024 | */ |
7ef61233 TH |
1025 | static int tomoyo_path_permission2(struct tomoyo_domain_info *const domain, |
1026 | u8 operation, | |
1027 | const struct tomoyo_path_info *filename, | |
1028 | const u8 mode) | |
b69a54ee KT |
1029 | { |
1030 | const char *msg; | |
1031 | int error; | |
1032 | const bool is_enforce = (mode == 3); | |
1033 | ||
1034 | if (!mode) | |
1035 | return 0; | |
1036 | next: | |
7ef61233 TH |
1037 | error = tomoyo_path_acl(domain, operation, filename); |
1038 | msg = tomoyo_path2keyword(operation); | |
b69a54ee KT |
1039 | if (!error) |
1040 | goto ok; | |
1041 | if (tomoyo_verbose_mode(domain)) | |
1042 | printk(KERN_WARNING "TOMOYO-%s: Access '%s %s' denied for %s\n", | |
1043 | tomoyo_get_msg(is_enforce), msg, filename->name, | |
1044 | tomoyo_get_last_name(domain)); | |
1045 | if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { | |
1046 | const char *name = tomoyo_get_file_pattern(filename)->name; | |
7ef61233 | 1047 | tomoyo_update_path_acl(operation, name, domain, false); |
b69a54ee KT |
1048 | } |
1049 | if (!is_enforce) | |
1050 | error = 0; | |
1051 | ok: | |
1052 | /* | |
1053 | * Since "allow_truncate" doesn't imply "allow_rewrite" permission, | |
1054 | * we need to check "allow_rewrite" permission if the filename is | |
1055 | * specified by "deny_rewrite" keyword. | |
1056 | */ | |
7ef61233 | 1057 | if (!error && operation == TOMOYO_TYPE_TRUNCATE && |
b69a54ee | 1058 | tomoyo_is_no_rewrite_file(filename)) { |
7ef61233 | 1059 | operation = TOMOYO_TYPE_REWRITE; |
b69a54ee KT |
1060 | goto next; |
1061 | } | |
1062 | return error; | |
1063 | } | |
1064 | ||
b69a54ee KT |
1065 | /** |
1066 | * tomoyo_check_exec_perm - Check permission for "execute". | |
1067 | * | |
1068 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1069 | * @filename: Check permission for "execute". | |
b69a54ee KT |
1070 | * |
1071 | * Returns 0 on success, negativevalue otherwise. | |
fdb8ebb7 TH |
1072 | * |
1073 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
1074 | */ |
1075 | int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain, | |
bcb86975 | 1076 | const struct tomoyo_path_info *filename) |
b69a54ee KT |
1077 | { |
1078 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1079 | ||
1080 | if (!mode) | |
1081 | return 0; | |
1082 | return tomoyo_check_file_perm2(domain, filename, 1, "do_execve", mode); | |
1083 | } | |
1084 | ||
1085 | /** | |
1086 | * tomoyo_check_open_permission - Check permission for "read" and "write". | |
1087 | * | |
1088 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1089 | * @path: Pointer to "struct path". | |
1090 | * @flag: Flags for open(). | |
1091 | * | |
1092 | * Returns 0 on success, negative value otherwise. | |
1093 | */ | |
1094 | int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, | |
1095 | struct path *path, const int flag) | |
1096 | { | |
1097 | const u8 acc_mode = ACC_MODE(flag); | |
1098 | int error = -ENOMEM; | |
1099 | struct tomoyo_path_info *buf; | |
1100 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1101 | const bool is_enforce = (mode == 3); | |
fdb8ebb7 | 1102 | int idx; |
b69a54ee KT |
1103 | |
1104 | if (!mode || !path->mnt) | |
1105 | return 0; | |
1106 | if (acc_mode == 0) | |
1107 | return 0; | |
1108 | if (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode)) | |
1109 | /* | |
1110 | * I don't check directories here because mkdir() and rmdir() | |
1111 | * don't call me. | |
1112 | */ | |
1113 | return 0; | |
fdb8ebb7 | 1114 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1115 | buf = tomoyo_get_path(path); |
1116 | if (!buf) | |
1117 | goto out; | |
1118 | error = 0; | |
1119 | /* | |
1120 | * If the filename is specified by "deny_rewrite" keyword, | |
1121 | * we need to check "allow_rewrite" permission when the filename is not | |
1122 | * opened for append mode or the filename is truncated at open time. | |
1123 | */ | |
1124 | if ((acc_mode & MAY_WRITE) && | |
1125 | ((flag & O_TRUNC) || !(flag & O_APPEND)) && | |
1126 | (tomoyo_is_no_rewrite_file(buf))) { | |
7ef61233 TH |
1127 | error = tomoyo_path_permission2(domain, TOMOYO_TYPE_REWRITE, |
1128 | buf, mode); | |
b69a54ee KT |
1129 | } |
1130 | if (!error) | |
1131 | error = tomoyo_check_file_perm2(domain, buf, acc_mode, "open", | |
1132 | mode); | |
1133 | if (!error && (flag & O_TRUNC)) | |
7ef61233 TH |
1134 | error = tomoyo_path_permission2(domain, TOMOYO_TYPE_TRUNCATE, |
1135 | buf, mode); | |
b69a54ee | 1136 | out: |
8e2d39a1 | 1137 | kfree(buf); |
fdb8ebb7 | 1138 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1139 | if (!is_enforce) |
1140 | error = 0; | |
1141 | return error; | |
1142 | } | |
1143 | ||
1144 | /** | |
7ef61233 | 1145 | * 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 | 1146 | * |
b69a54ee KT |
1147 | * @operation: Type of operation. |
1148 | * @path: Pointer to "struct path". | |
1149 | * | |
1150 | * Returns 0 on success, negative value otherwise. | |
1151 | */ | |
97d6931e | 1152 | int tomoyo_path_perm(const u8 operation, struct path *path) |
b69a54ee KT |
1153 | { |
1154 | int error = -ENOMEM; | |
1155 | struct tomoyo_path_info *buf; | |
97d6931e | 1156 | struct tomoyo_domain_info *domain = tomoyo_domain(); |
b69a54ee KT |
1157 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); |
1158 | const bool is_enforce = (mode == 3); | |
fdb8ebb7 | 1159 | int idx; |
b69a54ee KT |
1160 | |
1161 | if (!mode || !path->mnt) | |
1162 | return 0; | |
fdb8ebb7 | 1163 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1164 | buf = tomoyo_get_path(path); |
1165 | if (!buf) | |
1166 | goto out; | |
1167 | switch (operation) { | |
7ef61233 TH |
1168 | case TOMOYO_TYPE_MKDIR: |
1169 | case TOMOYO_TYPE_RMDIR: | |
1170 | case TOMOYO_TYPE_CHROOT: | |
b69a54ee KT |
1171 | if (!buf->is_dir) { |
1172 | /* | |
1173 | * tomoyo_get_path() reserves space for appending "/." | |
1174 | */ | |
1175 | strcat((char *) buf->name, "/"); | |
1176 | tomoyo_fill_path_info(buf); | |
1177 | } | |
1178 | } | |
7ef61233 | 1179 | error = tomoyo_path_permission2(domain, operation, buf, mode); |
b69a54ee | 1180 | out: |
8e2d39a1 | 1181 | kfree(buf); |
fdb8ebb7 | 1182 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1183 | if (!is_enforce) |
1184 | error = 0; | |
1185 | return error; | |
1186 | } | |
1187 | ||
1188 | /** | |
1189 | * tomoyo_check_rewrite_permission - Check permission for "rewrite". | |
1190 | * | |
b69a54ee KT |
1191 | * @filp: Pointer to "struct file". |
1192 | * | |
1193 | * Returns 0 on success, negative value otherwise. | |
1194 | */ | |
97d6931e | 1195 | int tomoyo_check_rewrite_permission(struct file *filp) |
b69a54ee KT |
1196 | { |
1197 | int error = -ENOMEM; | |
97d6931e | 1198 | struct tomoyo_domain_info *domain = tomoyo_domain(); |
b69a54ee KT |
1199 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); |
1200 | const bool is_enforce = (mode == 3); | |
1201 | struct tomoyo_path_info *buf; | |
fdb8ebb7 | 1202 | int idx; |
b69a54ee KT |
1203 | |
1204 | if (!mode || !filp->f_path.mnt) | |
1205 | return 0; | |
fdb8ebb7 TH |
1206 | |
1207 | idx = tomoyo_read_lock(); | |
b69a54ee KT |
1208 | buf = tomoyo_get_path(&filp->f_path); |
1209 | if (!buf) | |
1210 | goto out; | |
1211 | if (!tomoyo_is_no_rewrite_file(buf)) { | |
1212 | error = 0; | |
1213 | goto out; | |
1214 | } | |
7ef61233 | 1215 | error = tomoyo_path_permission2(domain, TOMOYO_TYPE_REWRITE, buf, mode); |
b69a54ee | 1216 | out: |
8e2d39a1 | 1217 | kfree(buf); |
fdb8ebb7 | 1218 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1219 | if (!is_enforce) |
1220 | error = 0; | |
1221 | return error; | |
1222 | } | |
1223 | ||
1224 | /** | |
7ef61233 | 1225 | * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root". |
b69a54ee | 1226 | * |
b69a54ee KT |
1227 | * @operation: Type of operation. |
1228 | * @path1: Pointer to "struct path". | |
1229 | * @path2: Pointer to "struct path". | |
1230 | * | |
1231 | * Returns 0 on success, negative value otherwise. | |
1232 | */ | |
97d6931e | 1233 | int tomoyo_path2_perm(const u8 operation, struct path *path1, |
7ef61233 | 1234 | struct path *path2) |
b69a54ee KT |
1235 | { |
1236 | int error = -ENOMEM; | |
1237 | struct tomoyo_path_info *buf1, *buf2; | |
97d6931e | 1238 | struct tomoyo_domain_info *domain = tomoyo_domain(); |
b69a54ee KT |
1239 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); |
1240 | const bool is_enforce = (mode == 3); | |
1241 | const char *msg; | |
fdb8ebb7 | 1242 | int idx; |
b69a54ee KT |
1243 | |
1244 | if (!mode || !path1->mnt || !path2->mnt) | |
1245 | return 0; | |
fdb8ebb7 | 1246 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1247 | buf1 = tomoyo_get_path(path1); |
1248 | buf2 = tomoyo_get_path(path2); | |
1249 | if (!buf1 || !buf2) | |
1250 | goto out; | |
1251 | { | |
1252 | struct dentry *dentry = path1->dentry; | |
1253 | if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) { | |
1254 | /* | |
1255 | * tomoyo_get_path() reserves space for appending "/." | |
1256 | */ | |
1257 | if (!buf1->is_dir) { | |
1258 | strcat((char *) buf1->name, "/"); | |
1259 | tomoyo_fill_path_info(buf1); | |
1260 | } | |
1261 | if (!buf2->is_dir) { | |
1262 | strcat((char *) buf2->name, "/"); | |
1263 | tomoyo_fill_path_info(buf2); | |
1264 | } | |
1265 | } | |
1266 | } | |
7ef61233 TH |
1267 | error = tomoyo_path2_acl(domain, operation, buf1, buf2); |
1268 | msg = tomoyo_path22keyword(operation); | |
b69a54ee KT |
1269 | if (!error) |
1270 | goto out; | |
1271 | if (tomoyo_verbose_mode(domain)) | |
1272 | printk(KERN_WARNING "TOMOYO-%s: Access '%s %s %s' " | |
1273 | "denied for %s\n", tomoyo_get_msg(is_enforce), | |
1274 | msg, buf1->name, buf2->name, | |
1275 | tomoyo_get_last_name(domain)); | |
1276 | if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { | |
1277 | const char *name1 = tomoyo_get_file_pattern(buf1)->name; | |
1278 | const char *name2 = tomoyo_get_file_pattern(buf2)->name; | |
7ef61233 TH |
1279 | tomoyo_update_path2_acl(operation, name1, name2, domain, |
1280 | false); | |
b69a54ee KT |
1281 | } |
1282 | out: | |
8e2d39a1 TH |
1283 | kfree(buf1); |
1284 | kfree(buf2); | |
fdb8ebb7 | 1285 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1286 | if (!is_enforce) |
1287 | error = 0; | |
1288 | return error; | |
1289 | } |