Commit | Line | Data |
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b69a54ee KT |
1 | /* |
2 | * security/tomoyo/file.c | |
3 | * | |
4 | * Implementation of the Domain-Based Mandatory Access Control. | |
5 | * | |
6 | * Copyright (C) 2005-2009 NTT DATA CORPORATION | |
7 | * | |
39826a1e | 8 | * Version: 2.2.0 2009/04/01 |
b69a54ee KT |
9 | * |
10 | */ | |
11 | ||
12 | #include "common.h" | |
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 TH |
102 | struct tomoyo_path_info_with_data *buf = kzalloc(sizeof(*buf), |
103 | GFP_KERNEL); | |
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 TH |
177 | if (!is_delete) |
178 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); | |
f737d95d | 179 | mutex_lock(&tomoyo_policy_lock); |
fdb8ebb7 | 180 | list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { |
b69a54ee KT |
181 | if (ptr->filename != saved_filename) |
182 | continue; | |
183 | ptr->is_deleted = is_delete; | |
184 | error = 0; | |
ca0b7df3 | 185 | break; |
b69a54ee | 186 | } |
ca0b7df3 TH |
187 | if (!is_delete && error && tomoyo_memory_ok(entry)) { |
188 | entry->filename = saved_filename; | |
bf24fb01 | 189 | saved_filename = NULL; |
ca0b7df3 TH |
190 | list_add_tail_rcu(&entry->list, &tomoyo_globally_readable_list); |
191 | entry = NULL; | |
192 | error = 0; | |
b69a54ee | 193 | } |
f737d95d | 194 | mutex_unlock(&tomoyo_policy_lock); |
bf24fb01 | 195 | tomoyo_put_name(saved_filename); |
ca0b7df3 | 196 | kfree(entry); |
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 | { | |
ca0b7df3 | 314 | struct tomoyo_pattern_entry *entry = NULL; |
b69a54ee KT |
315 | struct tomoyo_pattern_entry *ptr; |
316 | const struct tomoyo_path_info *saved_pattern; | |
ca0b7df3 | 317 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 318 | |
bf24fb01 | 319 | saved_pattern = tomoyo_get_name(pattern); |
b69a54ee | 320 | if (!saved_pattern) |
ca0b7df3 TH |
321 | return error; |
322 | if (!saved_pattern->is_patterned) | |
323 | goto out; | |
324 | if (!is_delete) | |
325 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); | |
f737d95d | 326 | mutex_lock(&tomoyo_policy_lock); |
fdb8ebb7 | 327 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { |
b69a54ee KT |
328 | if (saved_pattern != ptr->pattern) |
329 | continue; | |
330 | ptr->is_deleted = is_delete; | |
331 | error = 0; | |
ca0b7df3 | 332 | break; |
b69a54ee | 333 | } |
ca0b7df3 TH |
334 | if (!is_delete && error && tomoyo_memory_ok(entry)) { |
335 | entry->pattern = saved_pattern; | |
bf24fb01 | 336 | saved_pattern = NULL; |
ca0b7df3 TH |
337 | list_add_tail_rcu(&entry->list, &tomoyo_pattern_list); |
338 | entry = NULL; | |
339 | error = 0; | |
b69a54ee | 340 | } |
f737d95d | 341 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 TH |
342 | out: |
343 | kfree(entry); | |
bf24fb01 | 344 | tomoyo_put_name(saved_pattern); |
b69a54ee KT |
345 | return error; |
346 | } | |
347 | ||
348 | /** | |
349 | * tomoyo_get_file_pattern - Get patterned pathname. | |
350 | * | |
351 | * @filename: The filename to find patterned pathname. | |
352 | * | |
353 | * Returns pointer to pathname pattern if matched, @filename otherwise. | |
fdb8ebb7 TH |
354 | * |
355 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
356 | */ |
357 | static const struct tomoyo_path_info * | |
358 | tomoyo_get_file_pattern(const struct tomoyo_path_info *filename) | |
359 | { | |
360 | struct tomoyo_pattern_entry *ptr; | |
361 | const struct tomoyo_path_info *pattern = NULL; | |
362 | ||
fdb8ebb7 | 363 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { |
b69a54ee KT |
364 | if (ptr->is_deleted) |
365 | continue; | |
366 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
367 | continue; | |
368 | pattern = ptr->pattern; | |
369 | if (tomoyo_strendswith(pattern->name, "/\\*")) { | |
370 | /* Do nothing. Try to find the better match. */ | |
371 | } else { | |
372 | /* This would be the better match. Use this. */ | |
373 | break; | |
374 | } | |
375 | } | |
b69a54ee KT |
376 | if (pattern) |
377 | filename = pattern; | |
378 | return filename; | |
379 | } | |
380 | ||
381 | /** | |
382 | * tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list. | |
383 | * | |
384 | * @data: String to parse. | |
385 | * @is_delete: True if it is a delete request. | |
386 | * | |
387 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
388 | * |
389 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
390 | */ |
391 | int tomoyo_write_pattern_policy(char *data, const bool is_delete) | |
392 | { | |
393 | return tomoyo_update_file_pattern_entry(data, is_delete); | |
394 | } | |
395 | ||
396 | /** | |
397 | * tomoyo_read_file_pattern - Read "struct tomoyo_pattern_entry" list. | |
398 | * | |
399 | * @head: Pointer to "struct tomoyo_io_buffer". | |
400 | * | |
401 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
402 | * |
403 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
404 | */ |
405 | bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head) | |
406 | { | |
407 | struct list_head *pos; | |
408 | bool done = true; | |
409 | ||
b69a54ee KT |
410 | list_for_each_cookie(pos, head->read_var2, &tomoyo_pattern_list) { |
411 | struct tomoyo_pattern_entry *ptr; | |
412 | ptr = list_entry(pos, struct tomoyo_pattern_entry, list); | |
413 | if (ptr->is_deleted) | |
414 | continue; | |
7d2948b1 TH |
415 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_FILE_PATTERN |
416 | "%s\n", ptr->pattern->name); | |
417 | if (!done) | |
b69a54ee | 418 | break; |
b69a54ee | 419 | } |
b69a54ee KT |
420 | return done; |
421 | } | |
422 | ||
c3fa109a TH |
423 | /* |
424 | * tomoyo_no_rewrite_list is used for holding list of pathnames which are by | |
425 | * default forbidden to modify already written content of a file. | |
426 | * | |
427 | * An entry is added by | |
428 | * | |
429 | * # echo 'deny_rewrite /var/log/messages' > \ | |
430 | * /sys/kernel/security/tomoyo/exception_policy | |
431 | * | |
432 | * and is deleted by | |
433 | * | |
434 | * # echo 'delete deny_rewrite /var/log/messages' > \ | |
435 | * /sys/kernel/security/tomoyo/exception_policy | |
436 | * | |
437 | * and all entries are retrieved by | |
438 | * | |
439 | * # grep ^deny_rewrite /sys/kernel/security/tomoyo/exception_policy | |
440 | * | |
441 | * In the example above, if a process requested to rewrite /var/log/messages , | |
442 | * the process can't rewrite unless the domain which that process belongs to | |
443 | * has "allow_rewrite /var/log/messages" entry. | |
444 | * | |
445 | * It is not a desirable behavior that we have to add "\040(deleted)" suffix | |
446 | * when we want to allow rewriting already unlink()ed file. As of now, | |
447 | * LSM version of TOMOYO is using __d_path() for calculating pathname. | |
448 | * Non LSM version of TOMOYO is using its own function which doesn't append | |
449 | * " (deleted)" suffix if the file is already unlink()ed; so that we don't | |
450 | * need to worry whether the file is already unlink()ed or not. | |
451 | */ | |
847b173e | 452 | LIST_HEAD(tomoyo_no_rewrite_list); |
b69a54ee KT |
453 | |
454 | /** | |
455 | * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list. | |
456 | * | |
457 | * @pattern: Pathname pattern that are not rewritable by default. | |
458 | * @is_delete: True if it is a delete request. | |
459 | * | |
460 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
461 | * |
462 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
463 | */ |
464 | static int tomoyo_update_no_rewrite_entry(const char *pattern, | |
465 | const bool is_delete) | |
466 | { | |
ca0b7df3 TH |
467 | struct tomoyo_no_rewrite_entry *entry = NULL; |
468 | struct tomoyo_no_rewrite_entry *ptr; | |
b69a54ee | 469 | const struct tomoyo_path_info *saved_pattern; |
ca0b7df3 | 470 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 471 | |
17080008 | 472 | if (!tomoyo_is_correct_path(pattern, 0, 0, 0)) |
b69a54ee | 473 | return -EINVAL; |
bf24fb01 | 474 | saved_pattern = tomoyo_get_name(pattern); |
b69a54ee | 475 | if (!saved_pattern) |
ca0b7df3 TH |
476 | return error; |
477 | if (!is_delete) | |
478 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); | |
f737d95d | 479 | mutex_lock(&tomoyo_policy_lock); |
fdb8ebb7 | 480 | list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { |
b69a54ee KT |
481 | if (ptr->pattern != saved_pattern) |
482 | continue; | |
483 | ptr->is_deleted = is_delete; | |
484 | error = 0; | |
ca0b7df3 | 485 | break; |
b69a54ee | 486 | } |
ca0b7df3 TH |
487 | if (!is_delete && error && tomoyo_memory_ok(entry)) { |
488 | entry->pattern = saved_pattern; | |
bf24fb01 | 489 | saved_pattern = NULL; |
ca0b7df3 TH |
490 | list_add_tail_rcu(&entry->list, &tomoyo_no_rewrite_list); |
491 | entry = NULL; | |
492 | error = 0; | |
b69a54ee | 493 | } |
f737d95d | 494 | mutex_unlock(&tomoyo_policy_lock); |
bf24fb01 | 495 | tomoyo_put_name(saved_pattern); |
ca0b7df3 | 496 | kfree(entry); |
b69a54ee KT |
497 | return error; |
498 | } | |
499 | ||
500 | /** | |
501 | * tomoyo_is_no_rewrite_file - Check if the given pathname is not permitted to be rewrited. | |
502 | * | |
503 | * @filename: Filename to check. | |
504 | * | |
505 | * Returns true if @filename is specified by "deny_rewrite" directive, | |
506 | * false otherwise. | |
fdb8ebb7 TH |
507 | * |
508 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
509 | */ |
510 | static bool tomoyo_is_no_rewrite_file(const struct tomoyo_path_info *filename) | |
511 | { | |
512 | struct tomoyo_no_rewrite_entry *ptr; | |
513 | bool found = false; | |
514 | ||
fdb8ebb7 | 515 | list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { |
b69a54ee KT |
516 | if (ptr->is_deleted) |
517 | continue; | |
518 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
519 | continue; | |
520 | found = true; | |
521 | break; | |
522 | } | |
b69a54ee KT |
523 | return found; |
524 | } | |
525 | ||
526 | /** | |
527 | * tomoyo_write_no_rewrite_policy - Write "struct tomoyo_no_rewrite_entry" list. | |
528 | * | |
529 | * @data: String to parse. | |
530 | * @is_delete: True if it is a delete request. | |
531 | * | |
532 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
533 | * |
534 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
535 | */ |
536 | int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete) | |
537 | { | |
538 | return tomoyo_update_no_rewrite_entry(data, is_delete); | |
539 | } | |
540 | ||
541 | /** | |
542 | * tomoyo_read_no_rewrite_policy - Read "struct tomoyo_no_rewrite_entry" list. | |
543 | * | |
544 | * @head: Pointer to "struct tomoyo_io_buffer". | |
545 | * | |
546 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
547 | * |
548 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
549 | */ |
550 | bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head) | |
551 | { | |
552 | struct list_head *pos; | |
553 | bool done = true; | |
554 | ||
b69a54ee KT |
555 | list_for_each_cookie(pos, head->read_var2, &tomoyo_no_rewrite_list) { |
556 | struct tomoyo_no_rewrite_entry *ptr; | |
557 | ptr = list_entry(pos, struct tomoyo_no_rewrite_entry, list); | |
558 | if (ptr->is_deleted) | |
559 | continue; | |
7d2948b1 TH |
560 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_DENY_REWRITE |
561 | "%s\n", ptr->pattern->name); | |
562 | if (!done) | |
b69a54ee | 563 | break; |
b69a54ee | 564 | } |
b69a54ee KT |
565 | return done; |
566 | } | |
567 | ||
568 | /** | |
569 | * tomoyo_update_file_acl - Update file's read/write/execute ACL. | |
570 | * | |
571 | * @filename: Filename. | |
572 | * @perm: Permission (between 1 to 7). | |
573 | * @domain: Pointer to "struct tomoyo_domain_info". | |
574 | * @is_delete: True if it is a delete request. | |
575 | * | |
576 | * Returns 0 on success, negative value otherwise. | |
577 | * | |
578 | * This is legacy support interface for older policy syntax. | |
579 | * Current policy syntax uses "allow_read/write" instead of "6", | |
580 | * "allow_read" instead of "4", "allow_write" instead of "2", | |
581 | * "allow_execute" instead of "1". | |
fdb8ebb7 TH |
582 | * |
583 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
584 | */ |
585 | static int tomoyo_update_file_acl(const char *filename, u8 perm, | |
586 | struct tomoyo_domain_info * const domain, | |
587 | const bool is_delete) | |
588 | { | |
589 | if (perm > 7 || !perm) { | |
590 | printk(KERN_DEBUG "%s: Invalid permission '%d %s'\n", | |
591 | __func__, perm, filename); | |
592 | return -EINVAL; | |
593 | } | |
594 | if (filename[0] != '@' && tomoyo_strendswith(filename, "/")) | |
595 | /* | |
596 | * Only 'allow_mkdir' and 'allow_rmdir' are valid for | |
597 | * directory permissions. | |
598 | */ | |
599 | return 0; | |
600 | if (perm & 4) | |
7ef61233 TH |
601 | tomoyo_update_path_acl(TOMOYO_TYPE_READ, filename, domain, |
602 | is_delete); | |
b69a54ee | 603 | if (perm & 2) |
7ef61233 TH |
604 | tomoyo_update_path_acl(TOMOYO_TYPE_WRITE, filename, domain, |
605 | is_delete); | |
b69a54ee | 606 | if (perm & 1) |
7ef61233 TH |
607 | tomoyo_update_path_acl(TOMOYO_TYPE_EXECUTE, filename, domain, |
608 | is_delete); | |
b69a54ee KT |
609 | return 0; |
610 | } | |
611 | ||
612 | /** | |
7ef61233 | 613 | * tomoyo_path_acl2 - Check permission for single path operation. |
b69a54ee KT |
614 | * |
615 | * @domain: Pointer to "struct tomoyo_domain_info". | |
616 | * @filename: Filename to check. | |
617 | * @perm: Permission. | |
618 | * @may_use_pattern: True if patterned ACL is permitted. | |
619 | * | |
620 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
621 | * |
622 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 623 | */ |
7ef61233 TH |
624 | static int tomoyo_path_acl2(const struct tomoyo_domain_info *domain, |
625 | const struct tomoyo_path_info *filename, | |
626 | const u32 perm, const bool may_use_pattern) | |
b69a54ee KT |
627 | { |
628 | struct tomoyo_acl_info *ptr; | |
629 | int error = -EPERM; | |
630 | ||
fdb8ebb7 | 631 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
632 | struct tomoyo_path_acl *acl; |
633 | if (ptr->type != TOMOYO_TYPE_PATH_ACL) | |
b69a54ee | 634 | continue; |
7ef61233 | 635 | acl = container_of(ptr, struct tomoyo_path_acl, head); |
937bf613 TH |
636 | if (perm <= 0xFFFF) { |
637 | if (!(acl->perm & perm)) | |
638 | continue; | |
639 | } else { | |
640 | if (!(acl->perm_high & (perm >> 16))) | |
641 | continue; | |
642 | } | |
b69a54ee KT |
643 | if (may_use_pattern || !acl->filename->is_patterned) { |
644 | if (!tomoyo_path_matches_pattern(filename, | |
645 | acl->filename)) | |
646 | continue; | |
647 | } else { | |
648 | continue; | |
649 | } | |
650 | error = 0; | |
651 | break; | |
652 | } | |
b69a54ee KT |
653 | return error; |
654 | } | |
655 | ||
656 | /** | |
657 | * tomoyo_check_file_acl - Check permission for opening files. | |
658 | * | |
659 | * @domain: Pointer to "struct tomoyo_domain_info". | |
660 | * @filename: Filename to check. | |
661 | * @operation: Mode ("read" or "write" or "read/write" or "execute"). | |
662 | * | |
663 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
664 | * |
665 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
666 | */ |
667 | static int tomoyo_check_file_acl(const struct tomoyo_domain_info *domain, | |
668 | const struct tomoyo_path_info *filename, | |
669 | const u8 operation) | |
670 | { | |
937bf613 | 671 | u32 perm = 0; |
b69a54ee KT |
672 | |
673 | if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) | |
674 | return 0; | |
675 | if (operation == 6) | |
7ef61233 | 676 | perm = 1 << TOMOYO_TYPE_READ_WRITE; |
b69a54ee | 677 | else if (operation == 4) |
7ef61233 | 678 | perm = 1 << TOMOYO_TYPE_READ; |
b69a54ee | 679 | else if (operation == 2) |
7ef61233 | 680 | perm = 1 << TOMOYO_TYPE_WRITE; |
b69a54ee | 681 | else if (operation == 1) |
7ef61233 | 682 | perm = 1 << TOMOYO_TYPE_EXECUTE; |
b69a54ee KT |
683 | else |
684 | BUG(); | |
7ef61233 | 685 | return tomoyo_path_acl2(domain, filename, perm, operation != 1); |
b69a54ee KT |
686 | } |
687 | ||
688 | /** | |
689 | * tomoyo_check_file_perm2 - Check permission for opening files. | |
690 | * | |
691 | * @domain: Pointer to "struct tomoyo_domain_info". | |
692 | * @filename: Filename to check. | |
693 | * @perm: Mode ("read" or "write" or "read/write" or "execute"). | |
694 | * @operation: Operation name passed used for verbose mode. | |
695 | * @mode: Access control mode. | |
696 | * | |
697 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
698 | * |
699 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
700 | */ |
701 | static int tomoyo_check_file_perm2(struct tomoyo_domain_info * const domain, | |
702 | const struct tomoyo_path_info *filename, | |
703 | const u8 perm, const char *operation, | |
704 | const u8 mode) | |
705 | { | |
706 | const bool is_enforce = (mode == 3); | |
707 | const char *msg = "<unknown>"; | |
708 | int error = 0; | |
709 | ||
710 | if (!filename) | |
711 | return 0; | |
712 | error = tomoyo_check_file_acl(domain, filename, perm); | |
ea13ddba | 713 | if (error && perm == 4 && !domain->ignore_global_allow_read |
b69a54ee KT |
714 | && tomoyo_is_globally_readable_file(filename)) |
715 | error = 0; | |
716 | if (perm == 6) | |
7ef61233 | 717 | msg = tomoyo_path2keyword(TOMOYO_TYPE_READ_WRITE); |
b69a54ee | 718 | else if (perm == 4) |
7ef61233 | 719 | msg = tomoyo_path2keyword(TOMOYO_TYPE_READ); |
b69a54ee | 720 | else if (perm == 2) |
7ef61233 | 721 | msg = tomoyo_path2keyword(TOMOYO_TYPE_WRITE); |
b69a54ee | 722 | else if (perm == 1) |
7ef61233 | 723 | msg = tomoyo_path2keyword(TOMOYO_TYPE_EXECUTE); |
b69a54ee KT |
724 | else |
725 | BUG(); | |
726 | if (!error) | |
727 | return 0; | |
728 | if (tomoyo_verbose_mode(domain)) | |
729 | printk(KERN_WARNING "TOMOYO-%s: Access '%s(%s) %s' denied " | |
730 | "for %s\n", tomoyo_get_msg(is_enforce), msg, operation, | |
731 | filename->name, tomoyo_get_last_name(domain)); | |
732 | if (is_enforce) | |
733 | return error; | |
734 | if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { | |
735 | /* Don't use patterns for execute permission. */ | |
736 | const struct tomoyo_path_info *patterned_file = (perm != 1) ? | |
737 | tomoyo_get_file_pattern(filename) : filename; | |
738 | tomoyo_update_file_acl(patterned_file->name, perm, | |
739 | domain, false); | |
740 | } | |
741 | return 0; | |
742 | } | |
743 | ||
744 | /** | |
745 | * tomoyo_write_file_policy - Update file related list. | |
746 | * | |
747 | * @data: String to parse. | |
748 | * @domain: Pointer to "struct tomoyo_domain_info". | |
749 | * @is_delete: True if it is a delete request. | |
750 | * | |
751 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
752 | * |
753 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
754 | */ |
755 | int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, | |
756 | const bool is_delete) | |
757 | { | |
758 | char *filename = strchr(data, ' '); | |
759 | char *filename2; | |
760 | unsigned int perm; | |
761 | u8 type; | |
762 | ||
763 | if (!filename) | |
764 | return -EINVAL; | |
765 | *filename++ = '\0'; | |
766 | if (sscanf(data, "%u", &perm) == 1) | |
767 | return tomoyo_update_file_acl(filename, (u8) perm, domain, | |
768 | is_delete); | |
769 | if (strncmp(data, "allow_", 6)) | |
770 | goto out; | |
771 | data += 6; | |
7ef61233 TH |
772 | for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) { |
773 | if (strcmp(data, tomoyo_path_keyword[type])) | |
b69a54ee | 774 | continue; |
7ef61233 TH |
775 | return tomoyo_update_path_acl(type, filename, domain, |
776 | is_delete); | |
b69a54ee KT |
777 | } |
778 | filename2 = strchr(filename, ' '); | |
779 | if (!filename2) | |
780 | goto out; | |
781 | *filename2++ = '\0'; | |
7ef61233 TH |
782 | for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) { |
783 | if (strcmp(data, tomoyo_path2_keyword[type])) | |
b69a54ee | 784 | continue; |
7ef61233 TH |
785 | return tomoyo_update_path2_acl(type, filename, filename2, |
786 | domain, is_delete); | |
b69a54ee KT |
787 | } |
788 | out: | |
789 | return -EINVAL; | |
790 | } | |
791 | ||
792 | /** | |
7ef61233 | 793 | * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list. |
b69a54ee KT |
794 | * |
795 | * @type: Type of operation. | |
796 | * @filename: Filename. | |
797 | * @domain: Pointer to "struct tomoyo_domain_info". | |
798 | * @is_delete: True if it is a delete request. | |
799 | * | |
800 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
801 | * |
802 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 803 | */ |
7ef61233 TH |
804 | static int tomoyo_update_path_acl(const u8 type, const char *filename, |
805 | struct tomoyo_domain_info *const domain, | |
806 | const bool is_delete) | |
b69a54ee | 807 | { |
937bf613 | 808 | static const u32 rw_mask = |
7ef61233 | 809 | (1 << TOMOYO_TYPE_READ) | (1 << TOMOYO_TYPE_WRITE); |
b69a54ee KT |
810 | const struct tomoyo_path_info *saved_filename; |
811 | struct tomoyo_acl_info *ptr; | |
7ef61233 | 812 | struct tomoyo_path_acl *entry = NULL; |
ca0b7df3 | 813 | int error = is_delete ? -ENOENT : -ENOMEM; |
937bf613 | 814 | const u32 perm = 1 << type; |
b69a54ee KT |
815 | |
816 | if (!domain) | |
817 | return -EINVAL; | |
17080008 | 818 | if (!tomoyo_is_correct_path(filename, 0, 0, 0)) |
b69a54ee | 819 | return -EINVAL; |
bf24fb01 | 820 | saved_filename = tomoyo_get_name(filename); |
b69a54ee KT |
821 | if (!saved_filename) |
822 | return -ENOMEM; | |
ca0b7df3 TH |
823 | if (!is_delete) |
824 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); | |
f737d95d | 825 | mutex_lock(&tomoyo_policy_lock); |
fdb8ebb7 | 826 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
827 | struct tomoyo_path_acl *acl = |
828 | container_of(ptr, struct tomoyo_path_acl, head); | |
829 | if (ptr->type != TOMOYO_TYPE_PATH_ACL) | |
b69a54ee | 830 | continue; |
b69a54ee KT |
831 | if (acl->filename != saved_filename) |
832 | continue; | |
ca0b7df3 TH |
833 | if (is_delete) { |
834 | if (perm <= 0xFFFF) | |
835 | acl->perm &= ~perm; | |
836 | else | |
837 | acl->perm_high &= ~(perm >> 16); | |
838 | if ((acl->perm & rw_mask) != rw_mask) | |
7ef61233 TH |
839 | acl->perm &= ~(1 << TOMOYO_TYPE_READ_WRITE); |
840 | else if (!(acl->perm & (1 << TOMOYO_TYPE_READ_WRITE))) | |
ca0b7df3 TH |
841 | acl->perm &= ~rw_mask; |
842 | } else { | |
843 | if (perm <= 0xFFFF) | |
844 | acl->perm |= perm; | |
845 | else | |
846 | acl->perm_high |= (perm >> 16); | |
847 | if ((acl->perm & rw_mask) == rw_mask) | |
7ef61233 TH |
848 | acl->perm |= 1 << TOMOYO_TYPE_READ_WRITE; |
849 | else if (acl->perm & (1 << TOMOYO_TYPE_READ_WRITE)) | |
ca0b7df3 TH |
850 | acl->perm |= rw_mask; |
851 | } | |
b69a54ee | 852 | error = 0; |
ca0b7df3 | 853 | break; |
cd7bec6a | 854 | } |
ca0b7df3 | 855 | if (!is_delete && error && tomoyo_memory_ok(entry)) { |
7ef61233 | 856 | entry->head.type = TOMOYO_TYPE_PATH_ACL; |
937bf613 | 857 | if (perm <= 0xFFFF) |
ca0b7df3 | 858 | entry->perm = perm; |
937bf613 | 859 | else |
ca0b7df3 | 860 | entry->perm_high = (perm >> 16); |
7ef61233 | 861 | if (perm == (1 << TOMOYO_TYPE_READ_WRITE)) |
ca0b7df3 TH |
862 | entry->perm |= rw_mask; |
863 | entry->filename = saved_filename; | |
bf24fb01 | 864 | saved_filename = NULL; |
ca0b7df3 TH |
865 | list_add_tail_rcu(&entry->head.list, &domain->acl_info_list); |
866 | entry = NULL; | |
b69a54ee | 867 | error = 0; |
b69a54ee | 868 | } |
f737d95d | 869 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 870 | kfree(entry); |
bf24fb01 | 871 | tomoyo_put_name(saved_filename); |
b69a54ee KT |
872 | return error; |
873 | } | |
874 | ||
875 | /** | |
7ef61233 | 876 | * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list. |
b69a54ee KT |
877 | * |
878 | * @type: Type of operation. | |
879 | * @filename1: First filename. | |
880 | * @filename2: Second filename. | |
881 | * @domain: Pointer to "struct tomoyo_domain_info". | |
882 | * @is_delete: True if it is a delete request. | |
883 | * | |
884 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
885 | * |
886 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 887 | */ |
7ef61233 TH |
888 | static int tomoyo_update_path2_acl(const u8 type, const char *filename1, |
889 | const char *filename2, | |
890 | struct tomoyo_domain_info *const domain, | |
891 | const bool is_delete) | |
b69a54ee KT |
892 | { |
893 | const struct tomoyo_path_info *saved_filename1; | |
894 | const struct tomoyo_path_info *saved_filename2; | |
895 | struct tomoyo_acl_info *ptr; | |
7ef61233 | 896 | struct tomoyo_path2_acl *entry = NULL; |
ca0b7df3 | 897 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee KT |
898 | const u8 perm = 1 << type; |
899 | ||
900 | if (!domain) | |
901 | return -EINVAL; | |
17080008 TH |
902 | if (!tomoyo_is_correct_path(filename1, 0, 0, 0) || |
903 | !tomoyo_is_correct_path(filename2, 0, 0, 0)) | |
b69a54ee | 904 | return -EINVAL; |
bf24fb01 TH |
905 | saved_filename1 = tomoyo_get_name(filename1); |
906 | saved_filename2 = tomoyo_get_name(filename2); | |
b69a54ee | 907 | if (!saved_filename1 || !saved_filename2) |
ca0b7df3 TH |
908 | goto out; |
909 | if (!is_delete) | |
910 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); | |
f737d95d | 911 | mutex_lock(&tomoyo_policy_lock); |
fdb8ebb7 | 912 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
913 | struct tomoyo_path2_acl *acl = |
914 | container_of(ptr, struct tomoyo_path2_acl, head); | |
915 | if (ptr->type != TOMOYO_TYPE_PATH2_ACL) | |
b69a54ee | 916 | continue; |
b69a54ee KT |
917 | if (acl->filename1 != saved_filename1 || |
918 | acl->filename2 != saved_filename2) | |
919 | continue; | |
ca0b7df3 TH |
920 | if (is_delete) |
921 | acl->perm &= ~perm; | |
922 | else | |
923 | acl->perm |= perm; | |
b69a54ee | 924 | error = 0; |
ca0b7df3 | 925 | break; |
cd7bec6a | 926 | } |
ca0b7df3 | 927 | if (!is_delete && error && tomoyo_memory_ok(entry)) { |
7ef61233 | 928 | entry->head.type = TOMOYO_TYPE_PATH2_ACL; |
ca0b7df3 TH |
929 | entry->perm = perm; |
930 | entry->filename1 = saved_filename1; | |
bf24fb01 | 931 | saved_filename1 = NULL; |
ca0b7df3 | 932 | entry->filename2 = saved_filename2; |
bf24fb01 | 933 | saved_filename2 = NULL; |
ca0b7df3 TH |
934 | list_add_tail_rcu(&entry->head.list, &domain->acl_info_list); |
935 | entry = NULL; | |
b69a54ee | 936 | error = 0; |
b69a54ee | 937 | } |
f737d95d | 938 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 939 | out: |
bf24fb01 TH |
940 | tomoyo_put_name(saved_filename1); |
941 | tomoyo_put_name(saved_filename2); | |
ca0b7df3 | 942 | kfree(entry); |
b69a54ee KT |
943 | return error; |
944 | } | |
945 | ||
946 | /** | |
7ef61233 | 947 | * tomoyo_path_acl - Check permission for single path operation. |
b69a54ee KT |
948 | * |
949 | * @domain: Pointer to "struct tomoyo_domain_info". | |
950 | * @type: Type of operation. | |
951 | * @filename: Filename to check. | |
952 | * | |
953 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
954 | * |
955 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 956 | */ |
7ef61233 TH |
957 | static int tomoyo_path_acl(struct tomoyo_domain_info *domain, const u8 type, |
958 | const struct tomoyo_path_info *filename) | |
b69a54ee KT |
959 | { |
960 | if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) | |
961 | return 0; | |
7ef61233 | 962 | return tomoyo_path_acl2(domain, filename, 1 << type, 1); |
b69a54ee KT |
963 | } |
964 | ||
965 | /** | |
7ef61233 | 966 | * tomoyo_path2_acl - Check permission for double path operation. |
b69a54ee KT |
967 | * |
968 | * @domain: Pointer to "struct tomoyo_domain_info". | |
969 | * @type: Type of operation. | |
970 | * @filename1: First filename to check. | |
971 | * @filename2: Second filename to check. | |
972 | * | |
973 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
974 | * |
975 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 976 | */ |
7ef61233 TH |
977 | static int tomoyo_path2_acl(const struct tomoyo_domain_info *domain, |
978 | const u8 type, | |
979 | const struct tomoyo_path_info *filename1, | |
980 | const struct tomoyo_path_info *filename2) | |
b69a54ee KT |
981 | { |
982 | struct tomoyo_acl_info *ptr; | |
983 | const u8 perm = 1 << type; | |
984 | int error = -EPERM; | |
985 | ||
986 | if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) | |
987 | return 0; | |
fdb8ebb7 | 988 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
989 | struct tomoyo_path2_acl *acl; |
990 | if (ptr->type != TOMOYO_TYPE_PATH2_ACL) | |
b69a54ee | 991 | continue; |
7ef61233 | 992 | acl = container_of(ptr, struct tomoyo_path2_acl, head); |
b69a54ee KT |
993 | if (!(acl->perm & perm)) |
994 | continue; | |
995 | if (!tomoyo_path_matches_pattern(filename1, acl->filename1)) | |
996 | continue; | |
997 | if (!tomoyo_path_matches_pattern(filename2, acl->filename2)) | |
998 | continue; | |
999 | error = 0; | |
1000 | break; | |
1001 | } | |
b69a54ee KT |
1002 | return error; |
1003 | } | |
1004 | ||
1005 | /** | |
7ef61233 | 1006 | * tomoyo_path_permission2 - Check permission for single path operation. |
b69a54ee KT |
1007 | * |
1008 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1009 | * @operation: Type of operation. | |
1010 | * @filename: Filename to check. | |
1011 | * @mode: Access control mode. | |
1012 | * | |
1013 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1014 | * |
1015 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 1016 | */ |
7ef61233 TH |
1017 | static int tomoyo_path_permission2(struct tomoyo_domain_info *const domain, |
1018 | u8 operation, | |
1019 | const struct tomoyo_path_info *filename, | |
1020 | const u8 mode) | |
b69a54ee KT |
1021 | { |
1022 | const char *msg; | |
1023 | int error; | |
1024 | const bool is_enforce = (mode == 3); | |
1025 | ||
1026 | if (!mode) | |
1027 | return 0; | |
1028 | next: | |
7ef61233 TH |
1029 | error = tomoyo_path_acl(domain, operation, filename); |
1030 | msg = tomoyo_path2keyword(operation); | |
b69a54ee KT |
1031 | if (!error) |
1032 | goto ok; | |
1033 | if (tomoyo_verbose_mode(domain)) | |
1034 | printk(KERN_WARNING "TOMOYO-%s: Access '%s %s' denied for %s\n", | |
1035 | tomoyo_get_msg(is_enforce), msg, filename->name, | |
1036 | tomoyo_get_last_name(domain)); | |
1037 | if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { | |
1038 | const char *name = tomoyo_get_file_pattern(filename)->name; | |
7ef61233 | 1039 | tomoyo_update_path_acl(operation, name, domain, false); |
b69a54ee KT |
1040 | } |
1041 | if (!is_enforce) | |
1042 | error = 0; | |
1043 | ok: | |
1044 | /* | |
1045 | * Since "allow_truncate" doesn't imply "allow_rewrite" permission, | |
1046 | * we need to check "allow_rewrite" permission if the filename is | |
1047 | * specified by "deny_rewrite" keyword. | |
1048 | */ | |
7ef61233 | 1049 | if (!error && operation == TOMOYO_TYPE_TRUNCATE && |
b69a54ee | 1050 | tomoyo_is_no_rewrite_file(filename)) { |
7ef61233 | 1051 | operation = TOMOYO_TYPE_REWRITE; |
b69a54ee KT |
1052 | goto next; |
1053 | } | |
1054 | return error; | |
1055 | } | |
1056 | ||
b69a54ee KT |
1057 | /** |
1058 | * tomoyo_check_exec_perm - Check permission for "execute". | |
1059 | * | |
1060 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1061 | * @filename: Check permission for "execute". | |
b69a54ee KT |
1062 | * |
1063 | * Returns 0 on success, negativevalue otherwise. | |
fdb8ebb7 TH |
1064 | * |
1065 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
1066 | */ |
1067 | int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain, | |
bcb86975 | 1068 | const struct tomoyo_path_info *filename) |
b69a54ee KT |
1069 | { |
1070 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1071 | ||
1072 | if (!mode) | |
1073 | return 0; | |
1074 | return tomoyo_check_file_perm2(domain, filename, 1, "do_execve", mode); | |
1075 | } | |
1076 | ||
1077 | /** | |
1078 | * tomoyo_check_open_permission - Check permission for "read" and "write". | |
1079 | * | |
1080 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1081 | * @path: Pointer to "struct path". | |
1082 | * @flag: Flags for open(). | |
1083 | * | |
1084 | * Returns 0 on success, negative value otherwise. | |
1085 | */ | |
1086 | int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, | |
1087 | struct path *path, const int flag) | |
1088 | { | |
1089 | const u8 acc_mode = ACC_MODE(flag); | |
1090 | int error = -ENOMEM; | |
1091 | struct tomoyo_path_info *buf; | |
1092 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1093 | const bool is_enforce = (mode == 3); | |
fdb8ebb7 | 1094 | int idx; |
b69a54ee KT |
1095 | |
1096 | if (!mode || !path->mnt) | |
1097 | return 0; | |
1098 | if (acc_mode == 0) | |
1099 | return 0; | |
1100 | if (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode)) | |
1101 | /* | |
1102 | * I don't check directories here because mkdir() and rmdir() | |
1103 | * don't call me. | |
1104 | */ | |
1105 | return 0; | |
fdb8ebb7 | 1106 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1107 | buf = tomoyo_get_path(path); |
1108 | if (!buf) | |
1109 | goto out; | |
1110 | error = 0; | |
1111 | /* | |
1112 | * If the filename is specified by "deny_rewrite" keyword, | |
1113 | * we need to check "allow_rewrite" permission when the filename is not | |
1114 | * opened for append mode or the filename is truncated at open time. | |
1115 | */ | |
1116 | if ((acc_mode & MAY_WRITE) && | |
1117 | ((flag & O_TRUNC) || !(flag & O_APPEND)) && | |
1118 | (tomoyo_is_no_rewrite_file(buf))) { | |
7ef61233 TH |
1119 | error = tomoyo_path_permission2(domain, TOMOYO_TYPE_REWRITE, |
1120 | buf, mode); | |
b69a54ee KT |
1121 | } |
1122 | if (!error) | |
1123 | error = tomoyo_check_file_perm2(domain, buf, acc_mode, "open", | |
1124 | mode); | |
1125 | if (!error && (flag & O_TRUNC)) | |
7ef61233 TH |
1126 | error = tomoyo_path_permission2(domain, TOMOYO_TYPE_TRUNCATE, |
1127 | buf, mode); | |
b69a54ee | 1128 | out: |
8e2d39a1 | 1129 | kfree(buf); |
fdb8ebb7 | 1130 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1131 | if (!is_enforce) |
1132 | error = 0; | |
1133 | return error; | |
1134 | } | |
1135 | ||
1136 | /** | |
7ef61233 | 1137 | * 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 | 1138 | * |
b69a54ee KT |
1139 | * @operation: Type of operation. |
1140 | * @path: Pointer to "struct path". | |
1141 | * | |
1142 | * Returns 0 on success, negative value otherwise. | |
1143 | */ | |
97d6931e | 1144 | int tomoyo_path_perm(const u8 operation, struct path *path) |
b69a54ee KT |
1145 | { |
1146 | int error = -ENOMEM; | |
1147 | struct tomoyo_path_info *buf; | |
97d6931e | 1148 | struct tomoyo_domain_info *domain = tomoyo_domain(); |
b69a54ee KT |
1149 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); |
1150 | const bool is_enforce = (mode == 3); | |
fdb8ebb7 | 1151 | int idx; |
b69a54ee KT |
1152 | |
1153 | if (!mode || !path->mnt) | |
1154 | return 0; | |
fdb8ebb7 | 1155 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1156 | buf = tomoyo_get_path(path); |
1157 | if (!buf) | |
1158 | goto out; | |
1159 | switch (operation) { | |
7ef61233 TH |
1160 | case TOMOYO_TYPE_MKDIR: |
1161 | case TOMOYO_TYPE_RMDIR: | |
1162 | case TOMOYO_TYPE_CHROOT: | |
b69a54ee KT |
1163 | if (!buf->is_dir) { |
1164 | /* | |
1165 | * tomoyo_get_path() reserves space for appending "/." | |
1166 | */ | |
1167 | strcat((char *) buf->name, "/"); | |
1168 | tomoyo_fill_path_info(buf); | |
1169 | } | |
1170 | } | |
7ef61233 | 1171 | error = tomoyo_path_permission2(domain, operation, buf, mode); |
b69a54ee | 1172 | out: |
8e2d39a1 | 1173 | kfree(buf); |
fdb8ebb7 | 1174 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1175 | if (!is_enforce) |
1176 | error = 0; | |
1177 | return error; | |
1178 | } | |
1179 | ||
1180 | /** | |
1181 | * tomoyo_check_rewrite_permission - Check permission for "rewrite". | |
1182 | * | |
b69a54ee KT |
1183 | * @filp: Pointer to "struct file". |
1184 | * | |
1185 | * Returns 0 on success, negative value otherwise. | |
1186 | */ | |
97d6931e | 1187 | int tomoyo_check_rewrite_permission(struct file *filp) |
b69a54ee KT |
1188 | { |
1189 | int error = -ENOMEM; | |
97d6931e | 1190 | struct tomoyo_domain_info *domain = tomoyo_domain(); |
b69a54ee KT |
1191 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); |
1192 | const bool is_enforce = (mode == 3); | |
1193 | struct tomoyo_path_info *buf; | |
fdb8ebb7 | 1194 | int idx; |
b69a54ee KT |
1195 | |
1196 | if (!mode || !filp->f_path.mnt) | |
1197 | return 0; | |
fdb8ebb7 TH |
1198 | |
1199 | idx = tomoyo_read_lock(); | |
b69a54ee KT |
1200 | buf = tomoyo_get_path(&filp->f_path); |
1201 | if (!buf) | |
1202 | goto out; | |
1203 | if (!tomoyo_is_no_rewrite_file(buf)) { | |
1204 | error = 0; | |
1205 | goto out; | |
1206 | } | |
7ef61233 | 1207 | error = tomoyo_path_permission2(domain, TOMOYO_TYPE_REWRITE, buf, mode); |
b69a54ee | 1208 | out: |
8e2d39a1 | 1209 | kfree(buf); |
fdb8ebb7 | 1210 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1211 | if (!is_enforce) |
1212 | error = 0; | |
1213 | return error; | |
1214 | } | |
1215 | ||
1216 | /** | |
7ef61233 | 1217 | * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root". |
b69a54ee | 1218 | * |
b69a54ee KT |
1219 | * @operation: Type of operation. |
1220 | * @path1: Pointer to "struct path". | |
1221 | * @path2: Pointer to "struct path". | |
1222 | * | |
1223 | * Returns 0 on success, negative value otherwise. | |
1224 | */ | |
97d6931e | 1225 | int tomoyo_path2_perm(const u8 operation, struct path *path1, |
7ef61233 | 1226 | struct path *path2) |
b69a54ee KT |
1227 | { |
1228 | int error = -ENOMEM; | |
1229 | struct tomoyo_path_info *buf1, *buf2; | |
97d6931e | 1230 | struct tomoyo_domain_info *domain = tomoyo_domain(); |
b69a54ee KT |
1231 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); |
1232 | const bool is_enforce = (mode == 3); | |
1233 | const char *msg; | |
fdb8ebb7 | 1234 | int idx; |
b69a54ee KT |
1235 | |
1236 | if (!mode || !path1->mnt || !path2->mnt) | |
1237 | return 0; | |
fdb8ebb7 | 1238 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1239 | buf1 = tomoyo_get_path(path1); |
1240 | buf2 = tomoyo_get_path(path2); | |
1241 | if (!buf1 || !buf2) | |
1242 | goto out; | |
1243 | { | |
1244 | struct dentry *dentry = path1->dentry; | |
1245 | if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) { | |
1246 | /* | |
1247 | * tomoyo_get_path() reserves space for appending "/." | |
1248 | */ | |
1249 | if (!buf1->is_dir) { | |
1250 | strcat((char *) buf1->name, "/"); | |
1251 | tomoyo_fill_path_info(buf1); | |
1252 | } | |
1253 | if (!buf2->is_dir) { | |
1254 | strcat((char *) buf2->name, "/"); | |
1255 | tomoyo_fill_path_info(buf2); | |
1256 | } | |
1257 | } | |
1258 | } | |
7ef61233 TH |
1259 | error = tomoyo_path2_acl(domain, operation, buf1, buf2); |
1260 | msg = tomoyo_path22keyword(operation); | |
b69a54ee KT |
1261 | if (!error) |
1262 | goto out; | |
1263 | if (tomoyo_verbose_mode(domain)) | |
1264 | printk(KERN_WARNING "TOMOYO-%s: Access '%s %s %s' " | |
1265 | "denied for %s\n", tomoyo_get_msg(is_enforce), | |
1266 | msg, buf1->name, buf2->name, | |
1267 | tomoyo_get_last_name(domain)); | |
1268 | if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { | |
1269 | const char *name1 = tomoyo_get_file_pattern(buf1)->name; | |
1270 | const char *name2 = tomoyo_get_file_pattern(buf2)->name; | |
7ef61233 TH |
1271 | tomoyo_update_path2_acl(operation, name1, name2, domain, |
1272 | false); | |
b69a54ee KT |
1273 | } |
1274 | out: | |
8e2d39a1 TH |
1275 | kfree(buf1); |
1276 | kfree(buf2); | |
fdb8ebb7 | 1277 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1278 | if (!is_enforce) |
1279 | error = 0; | |
1280 | return error; | |
1281 | } |