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Commit | Line | Data |
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b69a54ee KT |
1 | /* |
2 | * security/tomoyo/file.c | |
3 | * | |
4 | * Implementation of the Domain-Based Mandatory Access Control. | |
5 | * | |
6 | * Copyright (C) 2005-2009 NTT DATA CORPORATION | |
7 | * | |
39826a1e | 8 | * Version: 2.2.0 2009/04/01 |
b69a54ee KT |
9 | * |
10 | */ | |
11 | ||
12 | #include "common.h" | |
b69a54ee KT |
13 | |
14 | /* Keyword array for single path operations. */ | |
7ef61233 TH |
15 | static const char *tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = { |
16 | [TOMOYO_TYPE_READ_WRITE] = "read/write", | |
17 | [TOMOYO_TYPE_EXECUTE] = "execute", | |
18 | [TOMOYO_TYPE_READ] = "read", | |
19 | [TOMOYO_TYPE_WRITE] = "write", | |
20 | [TOMOYO_TYPE_CREATE] = "create", | |
21 | [TOMOYO_TYPE_UNLINK] = "unlink", | |
22 | [TOMOYO_TYPE_MKDIR] = "mkdir", | |
23 | [TOMOYO_TYPE_RMDIR] = "rmdir", | |
24 | [TOMOYO_TYPE_MKFIFO] = "mkfifo", | |
25 | [TOMOYO_TYPE_MKSOCK] = "mksock", | |
26 | [TOMOYO_TYPE_MKBLOCK] = "mkblock", | |
27 | [TOMOYO_TYPE_MKCHAR] = "mkchar", | |
28 | [TOMOYO_TYPE_TRUNCATE] = "truncate", | |
29 | [TOMOYO_TYPE_SYMLINK] = "symlink", | |
30 | [TOMOYO_TYPE_REWRITE] = "rewrite", | |
31 | [TOMOYO_TYPE_IOCTL] = "ioctl", | |
32 | [TOMOYO_TYPE_CHMOD] = "chmod", | |
33 | [TOMOYO_TYPE_CHOWN] = "chown", | |
34 | [TOMOYO_TYPE_CHGRP] = "chgrp", | |
35 | [TOMOYO_TYPE_CHROOT] = "chroot", | |
36 | [TOMOYO_TYPE_MOUNT] = "mount", | |
37 | [TOMOYO_TYPE_UMOUNT] = "unmount", | |
b69a54ee KT |
38 | }; |
39 | ||
40 | /* Keyword array for double path operations. */ | |
7ef61233 TH |
41 | static const char *tomoyo_path2_keyword[TOMOYO_MAX_PATH2_OPERATION] = { |
42 | [TOMOYO_TYPE_LINK] = "link", | |
43 | [TOMOYO_TYPE_RENAME] = "rename", | |
44 | [TOMOYO_TYPE_PIVOT_ROOT] = "pivot_root", | |
b69a54ee KT |
45 | }; |
46 | ||
47 | /** | |
7ef61233 | 48 | * tomoyo_path2keyword - Get the name of single path operation. |
b69a54ee KT |
49 | * |
50 | * @operation: Type of operation. | |
51 | * | |
52 | * Returns the name of single path operation. | |
53 | */ | |
7ef61233 | 54 | const char *tomoyo_path2keyword(const u8 operation) |
b69a54ee | 55 | { |
7ef61233 TH |
56 | return (operation < TOMOYO_MAX_PATH_OPERATION) |
57 | ? tomoyo_path_keyword[operation] : NULL; | |
b69a54ee KT |
58 | } |
59 | ||
60 | /** | |
7ef61233 | 61 | * tomoyo_path22keyword - Get the name of double path operation. |
b69a54ee KT |
62 | * |
63 | * @operation: Type of operation. | |
64 | * | |
65 | * Returns the name of double path operation. | |
66 | */ | |
7ef61233 | 67 | const char *tomoyo_path22keyword(const u8 operation) |
b69a54ee | 68 | { |
7ef61233 TH |
69 | return (operation < TOMOYO_MAX_PATH2_OPERATION) |
70 | ? tomoyo_path2_keyword[operation] : NULL; | |
b69a54ee KT |
71 | } |
72 | ||
73 | /** | |
74 | * tomoyo_strendswith - Check whether the token ends with the given token. | |
75 | * | |
76 | * @name: The token to check. | |
77 | * @tail: The token to find. | |
78 | * | |
79 | * Returns true if @name ends with @tail, false otherwise. | |
80 | */ | |
81 | static bool tomoyo_strendswith(const char *name, const char *tail) | |
82 | { | |
83 | int len; | |
84 | ||
85 | if (!name || !tail) | |
86 | return false; | |
87 | len = strlen(name) - strlen(tail); | |
88 | return len >= 0 && !strcmp(name + len, tail); | |
89 | } | |
90 | ||
91 | /** | |
92 | * tomoyo_get_path - Get realpath. | |
93 | * | |
94 | * @path: Pointer to "struct path". | |
95 | * | |
96 | * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise. | |
97 | */ | |
98 | static struct tomoyo_path_info *tomoyo_get_path(struct path *path) | |
99 | { | |
100 | int error; | |
8e2d39a1 TH |
101 | struct tomoyo_path_info_with_data *buf = kzalloc(sizeof(*buf), |
102 | GFP_KERNEL); | |
b69a54ee KT |
103 | |
104 | if (!buf) | |
105 | return NULL; | |
106 | /* Reserve one byte for appending "/". */ | |
107 | error = tomoyo_realpath_from_path2(path, buf->body, | |
108 | sizeof(buf->body) - 2); | |
109 | if (!error) { | |
110 | buf->head.name = buf->body; | |
111 | tomoyo_fill_path_info(&buf->head); | |
112 | return &buf->head; | |
113 | } | |
8e2d39a1 | 114 | kfree(buf); |
b69a54ee KT |
115 | return NULL; |
116 | } | |
117 | ||
7ef61233 TH |
118 | static int tomoyo_update_path2_acl(const u8 type, const char *filename1, |
119 | const char *filename2, | |
120 | struct tomoyo_domain_info *const domain, | |
121 | const bool is_delete); | |
122 | static int tomoyo_update_path_acl(const u8 type, const char *filename, | |
123 | struct tomoyo_domain_info *const domain, | |
124 | const bool is_delete); | |
b69a54ee | 125 | |
c3fa109a TH |
126 | /* |
127 | * tomoyo_globally_readable_list is used for holding list of pathnames which | |
128 | * are by default allowed to be open()ed for reading by any process. | |
129 | * | |
130 | * An entry is added by | |
131 | * | |
132 | * # echo 'allow_read /lib/libc-2.5.so' > \ | |
133 | * /sys/kernel/security/tomoyo/exception_policy | |
134 | * | |
135 | * and is deleted by | |
136 | * | |
137 | * # echo 'delete allow_read /lib/libc-2.5.so' > \ | |
138 | * /sys/kernel/security/tomoyo/exception_policy | |
139 | * | |
140 | * and all entries are retrieved by | |
141 | * | |
142 | * # grep ^allow_read /sys/kernel/security/tomoyo/exception_policy | |
143 | * | |
144 | * In the example above, any process is allowed to | |
145 | * open("/lib/libc-2.5.so", O_RDONLY). | |
146 | * One exception is, if the domain which current process belongs to is marked | |
147 | * as "ignore_global_allow_read", current process can't do so unless explicitly | |
148 | * given "allow_read /lib/libc-2.5.so" to the domain which current process | |
149 | * belongs to. | |
150 | */ | |
847b173e | 151 | LIST_HEAD(tomoyo_globally_readable_list); |
b69a54ee KT |
152 | |
153 | /** | |
154 | * tomoyo_update_globally_readable_entry - Update "struct tomoyo_globally_readable_file_entry" list. | |
155 | * | |
156 | * @filename: Filename unconditionally permitted to open() for reading. | |
157 | * @is_delete: True if it is a delete request. | |
158 | * | |
159 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
160 | * |
161 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
162 | */ |
163 | static int tomoyo_update_globally_readable_entry(const char *filename, | |
164 | const bool is_delete) | |
165 | { | |
ca0b7df3 | 166 | struct tomoyo_globally_readable_file_entry *entry = NULL; |
b69a54ee KT |
167 | struct tomoyo_globally_readable_file_entry *ptr; |
168 | const struct tomoyo_path_info *saved_filename; | |
ca0b7df3 | 169 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 170 | |
17080008 | 171 | if (!tomoyo_is_correct_path(filename, 1, 0, -1)) |
b69a54ee | 172 | return -EINVAL; |
bf24fb01 | 173 | saved_filename = tomoyo_get_name(filename); |
b69a54ee KT |
174 | if (!saved_filename) |
175 | return -ENOMEM; | |
ca0b7df3 TH |
176 | if (!is_delete) |
177 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); | |
f737d95d | 178 | mutex_lock(&tomoyo_policy_lock); |
fdb8ebb7 | 179 | list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { |
b69a54ee KT |
180 | if (ptr->filename != saved_filename) |
181 | continue; | |
182 | ptr->is_deleted = is_delete; | |
183 | error = 0; | |
ca0b7df3 | 184 | break; |
b69a54ee | 185 | } |
ca0b7df3 TH |
186 | if (!is_delete && error && tomoyo_memory_ok(entry)) { |
187 | entry->filename = saved_filename; | |
bf24fb01 | 188 | saved_filename = NULL; |
ca0b7df3 TH |
189 | list_add_tail_rcu(&entry->list, &tomoyo_globally_readable_list); |
190 | entry = NULL; | |
191 | error = 0; | |
b69a54ee | 192 | } |
f737d95d | 193 | mutex_unlock(&tomoyo_policy_lock); |
bf24fb01 | 194 | tomoyo_put_name(saved_filename); |
ca0b7df3 | 195 | kfree(entry); |
b69a54ee KT |
196 | return error; |
197 | } | |
198 | ||
199 | /** | |
200 | * tomoyo_is_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading. | |
201 | * | |
202 | * @filename: The filename to check. | |
203 | * | |
204 | * Returns true if any domain can open @filename for reading, false otherwise. | |
fdb8ebb7 TH |
205 | * |
206 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
207 | */ |
208 | static bool tomoyo_is_globally_readable_file(const struct tomoyo_path_info * | |
209 | filename) | |
210 | { | |
211 | struct tomoyo_globally_readable_file_entry *ptr; | |
212 | bool found = false; | |
fdb8ebb7 TH |
213 | |
214 | list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { | |
b69a54ee KT |
215 | if (!ptr->is_deleted && |
216 | tomoyo_path_matches_pattern(filename, ptr->filename)) { | |
217 | found = true; | |
218 | break; | |
219 | } | |
220 | } | |
b69a54ee KT |
221 | return found; |
222 | } | |
223 | ||
224 | /** | |
225 | * tomoyo_write_globally_readable_policy - Write "struct tomoyo_globally_readable_file_entry" list. | |
226 | * | |
227 | * @data: String to parse. | |
228 | * @is_delete: True if it is a delete request. | |
229 | * | |
230 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
231 | * |
232 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
233 | */ |
234 | int tomoyo_write_globally_readable_policy(char *data, const bool is_delete) | |
235 | { | |
236 | return tomoyo_update_globally_readable_entry(data, is_delete); | |
237 | } | |
238 | ||
239 | /** | |
240 | * tomoyo_read_globally_readable_policy - Read "struct tomoyo_globally_readable_file_entry" list. | |
241 | * | |
242 | * @head: Pointer to "struct tomoyo_io_buffer". | |
243 | * | |
244 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
245 | * |
246 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
247 | */ |
248 | bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head) | |
249 | { | |
250 | struct list_head *pos; | |
251 | bool done = true; | |
252 | ||
b69a54ee KT |
253 | list_for_each_cookie(pos, head->read_var2, |
254 | &tomoyo_globally_readable_list) { | |
255 | struct tomoyo_globally_readable_file_entry *ptr; | |
256 | ptr = list_entry(pos, | |
257 | struct tomoyo_globally_readable_file_entry, | |
258 | list); | |
259 | if (ptr->is_deleted) | |
260 | continue; | |
7d2948b1 TH |
261 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_READ "%s\n", |
262 | ptr->filename->name); | |
263 | if (!done) | |
b69a54ee | 264 | break; |
b69a54ee | 265 | } |
b69a54ee KT |
266 | return done; |
267 | } | |
268 | ||
c3fa109a TH |
269 | /* tomoyo_pattern_list is used for holding list of pathnames which are used for |
270 | * converting pathnames to pathname patterns during learning mode. | |
271 | * | |
272 | * An entry is added by | |
273 | * | |
274 | * # echo 'file_pattern /proc/\$/mounts' > \ | |
275 | * /sys/kernel/security/tomoyo/exception_policy | |
276 | * | |
277 | * and is deleted by | |
278 | * | |
279 | * # echo 'delete file_pattern /proc/\$/mounts' > \ | |
280 | * /sys/kernel/security/tomoyo/exception_policy | |
281 | * | |
282 | * and all entries are retrieved by | |
283 | * | |
284 | * # grep ^file_pattern /sys/kernel/security/tomoyo/exception_policy | |
285 | * | |
286 | * In the example above, if a process which belongs to a domain which is in | |
287 | * learning mode requested open("/proc/1/mounts", O_RDONLY), | |
288 | * "allow_read /proc/\$/mounts" is automatically added to the domain which that | |
289 | * process belongs to. | |
290 | * | |
291 | * It is not a desirable behavior that we have to use /proc/\$/ instead of | |
292 | * /proc/self/ when current process needs to access only current process's | |
293 | * information. As of now, LSM version of TOMOYO is using __d_path() for | |
294 | * calculating pathname. Non LSM version of TOMOYO is using its own function | |
295 | * which pretends as if /proc/self/ is not a symlink; so that we can forbid | |
296 | * current process from accessing other process's information. | |
297 | */ | |
847b173e | 298 | LIST_HEAD(tomoyo_pattern_list); |
b69a54ee KT |
299 | |
300 | /** | |
301 | * tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list. | |
302 | * | |
303 | * @pattern: Pathname pattern. | |
304 | * @is_delete: True if it is a delete request. | |
305 | * | |
306 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
307 | * |
308 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
309 | */ |
310 | static int tomoyo_update_file_pattern_entry(const char *pattern, | |
311 | const bool is_delete) | |
312 | { | |
ca0b7df3 | 313 | struct tomoyo_pattern_entry *entry = NULL; |
b69a54ee KT |
314 | struct tomoyo_pattern_entry *ptr; |
315 | const struct tomoyo_path_info *saved_pattern; | |
ca0b7df3 | 316 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 317 | |
bf24fb01 | 318 | saved_pattern = tomoyo_get_name(pattern); |
b69a54ee | 319 | if (!saved_pattern) |
ca0b7df3 TH |
320 | return error; |
321 | if (!saved_pattern->is_patterned) | |
322 | goto out; | |
323 | if (!is_delete) | |
324 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); | |
f737d95d | 325 | mutex_lock(&tomoyo_policy_lock); |
fdb8ebb7 | 326 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { |
b69a54ee KT |
327 | if (saved_pattern != ptr->pattern) |
328 | continue; | |
329 | ptr->is_deleted = is_delete; | |
330 | error = 0; | |
ca0b7df3 | 331 | break; |
b69a54ee | 332 | } |
ca0b7df3 TH |
333 | if (!is_delete && error && tomoyo_memory_ok(entry)) { |
334 | entry->pattern = saved_pattern; | |
bf24fb01 | 335 | saved_pattern = NULL; |
ca0b7df3 TH |
336 | list_add_tail_rcu(&entry->list, &tomoyo_pattern_list); |
337 | entry = NULL; | |
338 | error = 0; | |
b69a54ee | 339 | } |
f737d95d | 340 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 TH |
341 | out: |
342 | kfree(entry); | |
bf24fb01 | 343 | tomoyo_put_name(saved_pattern); |
b69a54ee KT |
344 | return error; |
345 | } | |
346 | ||
347 | /** | |
348 | * tomoyo_get_file_pattern - Get patterned pathname. | |
349 | * | |
350 | * @filename: The filename to find patterned pathname. | |
351 | * | |
352 | * Returns pointer to pathname pattern if matched, @filename otherwise. | |
fdb8ebb7 TH |
353 | * |
354 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
355 | */ |
356 | static const struct tomoyo_path_info * | |
357 | tomoyo_get_file_pattern(const struct tomoyo_path_info *filename) | |
358 | { | |
359 | struct tomoyo_pattern_entry *ptr; | |
360 | const struct tomoyo_path_info *pattern = NULL; | |
361 | ||
fdb8ebb7 | 362 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { |
b69a54ee KT |
363 | if (ptr->is_deleted) |
364 | continue; | |
365 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
366 | continue; | |
367 | pattern = ptr->pattern; | |
368 | if (tomoyo_strendswith(pattern->name, "/\\*")) { | |
369 | /* Do nothing. Try to find the better match. */ | |
370 | } else { | |
371 | /* This would be the better match. Use this. */ | |
372 | break; | |
373 | } | |
374 | } | |
b69a54ee KT |
375 | if (pattern) |
376 | filename = pattern; | |
377 | return filename; | |
378 | } | |
379 | ||
380 | /** | |
381 | * tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list. | |
382 | * | |
383 | * @data: String to parse. | |
384 | * @is_delete: True if it is a delete request. | |
385 | * | |
386 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
387 | * |
388 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
389 | */ |
390 | int tomoyo_write_pattern_policy(char *data, const bool is_delete) | |
391 | { | |
392 | return tomoyo_update_file_pattern_entry(data, is_delete); | |
393 | } | |
394 | ||
395 | /** | |
396 | * tomoyo_read_file_pattern - Read "struct tomoyo_pattern_entry" list. | |
397 | * | |
398 | * @head: Pointer to "struct tomoyo_io_buffer". | |
399 | * | |
400 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
401 | * |
402 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
403 | */ |
404 | bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head) | |
405 | { | |
406 | struct list_head *pos; | |
407 | bool done = true; | |
408 | ||
b69a54ee KT |
409 | list_for_each_cookie(pos, head->read_var2, &tomoyo_pattern_list) { |
410 | struct tomoyo_pattern_entry *ptr; | |
411 | ptr = list_entry(pos, struct tomoyo_pattern_entry, list); | |
412 | if (ptr->is_deleted) | |
413 | continue; | |
7d2948b1 TH |
414 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_FILE_PATTERN |
415 | "%s\n", ptr->pattern->name); | |
416 | if (!done) | |
b69a54ee | 417 | break; |
b69a54ee | 418 | } |
b69a54ee KT |
419 | return done; |
420 | } | |
421 | ||
c3fa109a TH |
422 | /* |
423 | * tomoyo_no_rewrite_list is used for holding list of pathnames which are by | |
424 | * default forbidden to modify already written content of a file. | |
425 | * | |
426 | * An entry is added by | |
427 | * | |
428 | * # echo 'deny_rewrite /var/log/messages' > \ | |
429 | * /sys/kernel/security/tomoyo/exception_policy | |
430 | * | |
431 | * and is deleted by | |
432 | * | |
433 | * # echo 'delete deny_rewrite /var/log/messages' > \ | |
434 | * /sys/kernel/security/tomoyo/exception_policy | |
435 | * | |
436 | * and all entries are retrieved by | |
437 | * | |
438 | * # grep ^deny_rewrite /sys/kernel/security/tomoyo/exception_policy | |
439 | * | |
440 | * In the example above, if a process requested to rewrite /var/log/messages , | |
441 | * the process can't rewrite unless the domain which that process belongs to | |
442 | * has "allow_rewrite /var/log/messages" entry. | |
443 | * | |
444 | * It is not a desirable behavior that we have to add "\040(deleted)" suffix | |
445 | * when we want to allow rewriting already unlink()ed file. As of now, | |
446 | * LSM version of TOMOYO is using __d_path() for calculating pathname. | |
447 | * Non LSM version of TOMOYO is using its own function which doesn't append | |
448 | * " (deleted)" suffix if the file is already unlink()ed; so that we don't | |
449 | * need to worry whether the file is already unlink()ed or not. | |
450 | */ | |
847b173e | 451 | LIST_HEAD(tomoyo_no_rewrite_list); |
b69a54ee KT |
452 | |
453 | /** | |
454 | * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list. | |
455 | * | |
456 | * @pattern: Pathname pattern that are not rewritable by default. | |
457 | * @is_delete: True if it is a delete request. | |
458 | * | |
459 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
460 | * |
461 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
462 | */ |
463 | static int tomoyo_update_no_rewrite_entry(const char *pattern, | |
464 | const bool is_delete) | |
465 | { | |
ca0b7df3 TH |
466 | struct tomoyo_no_rewrite_entry *entry = NULL; |
467 | struct tomoyo_no_rewrite_entry *ptr; | |
b69a54ee | 468 | const struct tomoyo_path_info *saved_pattern; |
ca0b7df3 | 469 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 470 | |
17080008 | 471 | if (!tomoyo_is_correct_path(pattern, 0, 0, 0)) |
b69a54ee | 472 | return -EINVAL; |
bf24fb01 | 473 | saved_pattern = tomoyo_get_name(pattern); |
b69a54ee | 474 | if (!saved_pattern) |
ca0b7df3 TH |
475 | return error; |
476 | if (!is_delete) | |
477 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); | |
f737d95d | 478 | mutex_lock(&tomoyo_policy_lock); |
fdb8ebb7 | 479 | list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { |
b69a54ee KT |
480 | if (ptr->pattern != saved_pattern) |
481 | continue; | |
482 | ptr->is_deleted = is_delete; | |
483 | error = 0; | |
ca0b7df3 | 484 | break; |
b69a54ee | 485 | } |
ca0b7df3 TH |
486 | if (!is_delete && error && tomoyo_memory_ok(entry)) { |
487 | entry->pattern = saved_pattern; | |
bf24fb01 | 488 | saved_pattern = NULL; |
ca0b7df3 TH |
489 | list_add_tail_rcu(&entry->list, &tomoyo_no_rewrite_list); |
490 | entry = NULL; | |
491 | error = 0; | |
b69a54ee | 492 | } |
f737d95d | 493 | mutex_unlock(&tomoyo_policy_lock); |
bf24fb01 | 494 | tomoyo_put_name(saved_pattern); |
ca0b7df3 | 495 | kfree(entry); |
b69a54ee KT |
496 | return error; |
497 | } | |
498 | ||
499 | /** | |
500 | * tomoyo_is_no_rewrite_file - Check if the given pathname is not permitted to be rewrited. | |
501 | * | |
502 | * @filename: Filename to check. | |
503 | * | |
504 | * Returns true if @filename is specified by "deny_rewrite" directive, | |
505 | * false otherwise. | |
fdb8ebb7 TH |
506 | * |
507 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
508 | */ |
509 | static bool tomoyo_is_no_rewrite_file(const struct tomoyo_path_info *filename) | |
510 | { | |
511 | struct tomoyo_no_rewrite_entry *ptr; | |
512 | bool found = false; | |
513 | ||
fdb8ebb7 | 514 | list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { |
b69a54ee KT |
515 | if (ptr->is_deleted) |
516 | continue; | |
517 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
518 | continue; | |
519 | found = true; | |
520 | break; | |
521 | } | |
b69a54ee KT |
522 | return found; |
523 | } | |
524 | ||
525 | /** | |
526 | * tomoyo_write_no_rewrite_policy - Write "struct tomoyo_no_rewrite_entry" list. | |
527 | * | |
528 | * @data: String to parse. | |
529 | * @is_delete: True if it is a delete request. | |
530 | * | |
531 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
532 | * |
533 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
534 | */ |
535 | int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete) | |
536 | { | |
537 | return tomoyo_update_no_rewrite_entry(data, is_delete); | |
538 | } | |
539 | ||
540 | /** | |
541 | * tomoyo_read_no_rewrite_policy - Read "struct tomoyo_no_rewrite_entry" list. | |
542 | * | |
543 | * @head: Pointer to "struct tomoyo_io_buffer". | |
544 | * | |
545 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
546 | * |
547 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
548 | */ |
549 | bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head) | |
550 | { | |
551 | struct list_head *pos; | |
552 | bool done = true; | |
553 | ||
b69a54ee KT |
554 | list_for_each_cookie(pos, head->read_var2, &tomoyo_no_rewrite_list) { |
555 | struct tomoyo_no_rewrite_entry *ptr; | |
556 | ptr = list_entry(pos, struct tomoyo_no_rewrite_entry, list); | |
557 | if (ptr->is_deleted) | |
558 | continue; | |
7d2948b1 TH |
559 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_DENY_REWRITE |
560 | "%s\n", ptr->pattern->name); | |
561 | if (!done) | |
b69a54ee | 562 | break; |
b69a54ee | 563 | } |
b69a54ee KT |
564 | return done; |
565 | } | |
566 | ||
567 | /** | |
568 | * tomoyo_update_file_acl - Update file's read/write/execute ACL. | |
569 | * | |
570 | * @filename: Filename. | |
571 | * @perm: Permission (between 1 to 7). | |
572 | * @domain: Pointer to "struct tomoyo_domain_info". | |
573 | * @is_delete: True if it is a delete request. | |
574 | * | |
575 | * Returns 0 on success, negative value otherwise. | |
576 | * | |
577 | * This is legacy support interface for older policy syntax. | |
578 | * Current policy syntax uses "allow_read/write" instead of "6", | |
579 | * "allow_read" instead of "4", "allow_write" instead of "2", | |
580 | * "allow_execute" instead of "1". | |
fdb8ebb7 TH |
581 | * |
582 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
583 | */ |
584 | static int tomoyo_update_file_acl(const char *filename, u8 perm, | |
585 | struct tomoyo_domain_info * const domain, | |
586 | const bool is_delete) | |
587 | { | |
588 | if (perm > 7 || !perm) { | |
589 | printk(KERN_DEBUG "%s: Invalid permission '%d %s'\n", | |
590 | __func__, perm, filename); | |
591 | return -EINVAL; | |
592 | } | |
593 | if (filename[0] != '@' && tomoyo_strendswith(filename, "/")) | |
594 | /* | |
595 | * Only 'allow_mkdir' and 'allow_rmdir' are valid for | |
596 | * directory permissions. | |
597 | */ | |
598 | return 0; | |
599 | if (perm & 4) | |
7ef61233 TH |
600 | tomoyo_update_path_acl(TOMOYO_TYPE_READ, filename, domain, |
601 | is_delete); | |
b69a54ee | 602 | if (perm & 2) |
7ef61233 TH |
603 | tomoyo_update_path_acl(TOMOYO_TYPE_WRITE, filename, domain, |
604 | is_delete); | |
b69a54ee | 605 | if (perm & 1) |
7ef61233 TH |
606 | tomoyo_update_path_acl(TOMOYO_TYPE_EXECUTE, filename, domain, |
607 | is_delete); | |
b69a54ee KT |
608 | return 0; |
609 | } | |
610 | ||
611 | /** | |
7ef61233 | 612 | * tomoyo_path_acl2 - Check permission for single path operation. |
b69a54ee KT |
613 | * |
614 | * @domain: Pointer to "struct tomoyo_domain_info". | |
615 | * @filename: Filename to check. | |
616 | * @perm: Permission. | |
617 | * @may_use_pattern: True if patterned ACL is permitted. | |
618 | * | |
619 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
620 | * |
621 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 622 | */ |
7ef61233 TH |
623 | static int tomoyo_path_acl2(const struct tomoyo_domain_info *domain, |
624 | const struct tomoyo_path_info *filename, | |
625 | const u32 perm, const bool may_use_pattern) | |
b69a54ee KT |
626 | { |
627 | struct tomoyo_acl_info *ptr; | |
628 | int error = -EPERM; | |
629 | ||
fdb8ebb7 | 630 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
631 | struct tomoyo_path_acl *acl; |
632 | if (ptr->type != TOMOYO_TYPE_PATH_ACL) | |
b69a54ee | 633 | continue; |
7ef61233 | 634 | acl = container_of(ptr, struct tomoyo_path_acl, head); |
937bf613 TH |
635 | if (perm <= 0xFFFF) { |
636 | if (!(acl->perm & perm)) | |
637 | continue; | |
638 | } else { | |
639 | if (!(acl->perm_high & (perm >> 16))) | |
640 | continue; | |
641 | } | |
b69a54ee KT |
642 | if (may_use_pattern || !acl->filename->is_patterned) { |
643 | if (!tomoyo_path_matches_pattern(filename, | |
644 | acl->filename)) | |
645 | continue; | |
646 | } else { | |
647 | continue; | |
648 | } | |
649 | error = 0; | |
650 | break; | |
651 | } | |
b69a54ee KT |
652 | return error; |
653 | } | |
654 | ||
655 | /** | |
656 | * tomoyo_check_file_acl - Check permission for opening files. | |
657 | * | |
658 | * @domain: Pointer to "struct tomoyo_domain_info". | |
659 | * @filename: Filename to check. | |
660 | * @operation: Mode ("read" or "write" or "read/write" or "execute"). | |
661 | * | |
662 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
663 | * |
664 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
665 | */ |
666 | static int tomoyo_check_file_acl(const struct tomoyo_domain_info *domain, | |
667 | const struct tomoyo_path_info *filename, | |
668 | const u8 operation) | |
669 | { | |
937bf613 | 670 | u32 perm = 0; |
b69a54ee KT |
671 | |
672 | if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) | |
673 | return 0; | |
674 | if (operation == 6) | |
7ef61233 | 675 | perm = 1 << TOMOYO_TYPE_READ_WRITE; |
b69a54ee | 676 | else if (operation == 4) |
7ef61233 | 677 | perm = 1 << TOMOYO_TYPE_READ; |
b69a54ee | 678 | else if (operation == 2) |
7ef61233 | 679 | perm = 1 << TOMOYO_TYPE_WRITE; |
b69a54ee | 680 | else if (operation == 1) |
7ef61233 | 681 | perm = 1 << TOMOYO_TYPE_EXECUTE; |
b69a54ee KT |
682 | else |
683 | BUG(); | |
7ef61233 | 684 | return tomoyo_path_acl2(domain, filename, perm, operation != 1); |
b69a54ee KT |
685 | } |
686 | ||
687 | /** | |
688 | * tomoyo_check_file_perm2 - Check permission for opening files. | |
689 | * | |
690 | * @domain: Pointer to "struct tomoyo_domain_info". | |
691 | * @filename: Filename to check. | |
692 | * @perm: Mode ("read" or "write" or "read/write" or "execute"). | |
693 | * @operation: Operation name passed used for verbose mode. | |
694 | * @mode: Access control mode. | |
695 | * | |
696 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
697 | * |
698 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
699 | */ |
700 | static int tomoyo_check_file_perm2(struct tomoyo_domain_info * const domain, | |
701 | const struct tomoyo_path_info *filename, | |
702 | const u8 perm, const char *operation, | |
703 | const u8 mode) | |
704 | { | |
705 | const bool is_enforce = (mode == 3); | |
706 | const char *msg = "<unknown>"; | |
707 | int error = 0; | |
708 | ||
709 | if (!filename) | |
710 | return 0; | |
711 | error = tomoyo_check_file_acl(domain, filename, perm); | |
ea13ddba | 712 | if (error && perm == 4 && !domain->ignore_global_allow_read |
b69a54ee KT |
713 | && tomoyo_is_globally_readable_file(filename)) |
714 | error = 0; | |
715 | if (perm == 6) | |
7ef61233 | 716 | msg = tomoyo_path2keyword(TOMOYO_TYPE_READ_WRITE); |
b69a54ee | 717 | else if (perm == 4) |
7ef61233 | 718 | msg = tomoyo_path2keyword(TOMOYO_TYPE_READ); |
b69a54ee | 719 | else if (perm == 2) |
7ef61233 | 720 | msg = tomoyo_path2keyword(TOMOYO_TYPE_WRITE); |
b69a54ee | 721 | else if (perm == 1) |
7ef61233 | 722 | msg = tomoyo_path2keyword(TOMOYO_TYPE_EXECUTE); |
b69a54ee KT |
723 | else |
724 | BUG(); | |
725 | if (!error) | |
726 | return 0; | |
727 | if (tomoyo_verbose_mode(domain)) | |
728 | printk(KERN_WARNING "TOMOYO-%s: Access '%s(%s) %s' denied " | |
729 | "for %s\n", tomoyo_get_msg(is_enforce), msg, operation, | |
730 | filename->name, tomoyo_get_last_name(domain)); | |
731 | if (is_enforce) | |
732 | return error; | |
733 | if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { | |
734 | /* Don't use patterns for execute permission. */ | |
735 | const struct tomoyo_path_info *patterned_file = (perm != 1) ? | |
736 | tomoyo_get_file_pattern(filename) : filename; | |
737 | tomoyo_update_file_acl(patterned_file->name, perm, | |
738 | domain, false); | |
739 | } | |
740 | return 0; | |
741 | } | |
742 | ||
743 | /** | |
744 | * tomoyo_write_file_policy - Update file related list. | |
745 | * | |
746 | * @data: String to parse. | |
747 | * @domain: Pointer to "struct tomoyo_domain_info". | |
748 | * @is_delete: True if it is a delete request. | |
749 | * | |
750 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
751 | * |
752 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
753 | */ |
754 | int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, | |
755 | const bool is_delete) | |
756 | { | |
757 | char *filename = strchr(data, ' '); | |
758 | char *filename2; | |
759 | unsigned int perm; | |
760 | u8 type; | |
761 | ||
762 | if (!filename) | |
763 | return -EINVAL; | |
764 | *filename++ = '\0'; | |
765 | if (sscanf(data, "%u", &perm) == 1) | |
766 | return tomoyo_update_file_acl(filename, (u8) perm, domain, | |
767 | is_delete); | |
768 | if (strncmp(data, "allow_", 6)) | |
769 | goto out; | |
770 | data += 6; | |
7ef61233 TH |
771 | for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) { |
772 | if (strcmp(data, tomoyo_path_keyword[type])) | |
b69a54ee | 773 | continue; |
7ef61233 TH |
774 | return tomoyo_update_path_acl(type, filename, domain, |
775 | is_delete); | |
b69a54ee KT |
776 | } |
777 | filename2 = strchr(filename, ' '); | |
778 | if (!filename2) | |
779 | goto out; | |
780 | *filename2++ = '\0'; | |
7ef61233 TH |
781 | for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) { |
782 | if (strcmp(data, tomoyo_path2_keyword[type])) | |
b69a54ee | 783 | continue; |
7ef61233 TH |
784 | return tomoyo_update_path2_acl(type, filename, filename2, |
785 | domain, is_delete); | |
b69a54ee KT |
786 | } |
787 | out: | |
788 | return -EINVAL; | |
789 | } | |
790 | ||
791 | /** | |
7ef61233 | 792 | * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list. |
b69a54ee KT |
793 | * |
794 | * @type: Type of operation. | |
795 | * @filename: Filename. | |
796 | * @domain: Pointer to "struct tomoyo_domain_info". | |
797 | * @is_delete: True if it is a delete request. | |
798 | * | |
799 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
800 | * |
801 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 802 | */ |
7ef61233 TH |
803 | static int tomoyo_update_path_acl(const u8 type, const char *filename, |
804 | struct tomoyo_domain_info *const domain, | |
805 | const bool is_delete) | |
b69a54ee | 806 | { |
937bf613 | 807 | static const u32 rw_mask = |
7ef61233 | 808 | (1 << TOMOYO_TYPE_READ) | (1 << TOMOYO_TYPE_WRITE); |
b69a54ee KT |
809 | const struct tomoyo_path_info *saved_filename; |
810 | struct tomoyo_acl_info *ptr; | |
7ef61233 | 811 | struct tomoyo_path_acl *entry = NULL; |
ca0b7df3 | 812 | int error = is_delete ? -ENOENT : -ENOMEM; |
937bf613 | 813 | const u32 perm = 1 << type; |
b69a54ee KT |
814 | |
815 | if (!domain) | |
816 | return -EINVAL; | |
17080008 | 817 | if (!tomoyo_is_correct_path(filename, 0, 0, 0)) |
b69a54ee | 818 | return -EINVAL; |
bf24fb01 | 819 | saved_filename = tomoyo_get_name(filename); |
b69a54ee KT |
820 | if (!saved_filename) |
821 | return -ENOMEM; | |
ca0b7df3 TH |
822 | if (!is_delete) |
823 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); | |
f737d95d | 824 | mutex_lock(&tomoyo_policy_lock); |
fdb8ebb7 | 825 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
826 | struct tomoyo_path_acl *acl = |
827 | container_of(ptr, struct tomoyo_path_acl, head); | |
828 | if (ptr->type != TOMOYO_TYPE_PATH_ACL) | |
b69a54ee | 829 | continue; |
b69a54ee KT |
830 | if (acl->filename != saved_filename) |
831 | continue; | |
ca0b7df3 TH |
832 | if (is_delete) { |
833 | if (perm <= 0xFFFF) | |
834 | acl->perm &= ~perm; | |
835 | else | |
836 | acl->perm_high &= ~(perm >> 16); | |
837 | if ((acl->perm & rw_mask) != rw_mask) | |
7ef61233 TH |
838 | acl->perm &= ~(1 << TOMOYO_TYPE_READ_WRITE); |
839 | else if (!(acl->perm & (1 << TOMOYO_TYPE_READ_WRITE))) | |
ca0b7df3 TH |
840 | acl->perm &= ~rw_mask; |
841 | } else { | |
842 | if (perm <= 0xFFFF) | |
843 | acl->perm |= perm; | |
844 | else | |
845 | acl->perm_high |= (perm >> 16); | |
846 | if ((acl->perm & rw_mask) == rw_mask) | |
7ef61233 TH |
847 | acl->perm |= 1 << TOMOYO_TYPE_READ_WRITE; |
848 | else if (acl->perm & (1 << TOMOYO_TYPE_READ_WRITE)) | |
ca0b7df3 TH |
849 | acl->perm |= rw_mask; |
850 | } | |
b69a54ee | 851 | error = 0; |
ca0b7df3 | 852 | break; |
cd7bec6a | 853 | } |
ca0b7df3 | 854 | if (!is_delete && error && tomoyo_memory_ok(entry)) { |
7ef61233 | 855 | entry->head.type = TOMOYO_TYPE_PATH_ACL; |
937bf613 | 856 | if (perm <= 0xFFFF) |
ca0b7df3 | 857 | entry->perm = perm; |
937bf613 | 858 | else |
ca0b7df3 | 859 | entry->perm_high = (perm >> 16); |
7ef61233 | 860 | if (perm == (1 << TOMOYO_TYPE_READ_WRITE)) |
ca0b7df3 TH |
861 | entry->perm |= rw_mask; |
862 | entry->filename = saved_filename; | |
bf24fb01 | 863 | saved_filename = NULL; |
ca0b7df3 TH |
864 | list_add_tail_rcu(&entry->head.list, &domain->acl_info_list); |
865 | entry = NULL; | |
b69a54ee | 866 | error = 0; |
b69a54ee | 867 | } |
f737d95d | 868 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 869 | kfree(entry); |
bf24fb01 | 870 | tomoyo_put_name(saved_filename); |
b69a54ee KT |
871 | return error; |
872 | } | |
873 | ||
874 | /** | |
7ef61233 | 875 | * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list. |
b69a54ee KT |
876 | * |
877 | * @type: Type of operation. | |
878 | * @filename1: First filename. | |
879 | * @filename2: Second filename. | |
880 | * @domain: Pointer to "struct tomoyo_domain_info". | |
881 | * @is_delete: True if it is a delete request. | |
882 | * | |
883 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
884 | * |
885 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 886 | */ |
7ef61233 TH |
887 | static int tomoyo_update_path2_acl(const u8 type, const char *filename1, |
888 | const char *filename2, | |
889 | struct tomoyo_domain_info *const domain, | |
890 | const bool is_delete) | |
b69a54ee KT |
891 | { |
892 | const struct tomoyo_path_info *saved_filename1; | |
893 | const struct tomoyo_path_info *saved_filename2; | |
894 | struct tomoyo_acl_info *ptr; | |
7ef61233 | 895 | struct tomoyo_path2_acl *entry = NULL; |
ca0b7df3 | 896 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee KT |
897 | const u8 perm = 1 << type; |
898 | ||
899 | if (!domain) | |
900 | return -EINVAL; | |
17080008 TH |
901 | if (!tomoyo_is_correct_path(filename1, 0, 0, 0) || |
902 | !tomoyo_is_correct_path(filename2, 0, 0, 0)) | |
b69a54ee | 903 | return -EINVAL; |
bf24fb01 TH |
904 | saved_filename1 = tomoyo_get_name(filename1); |
905 | saved_filename2 = tomoyo_get_name(filename2); | |
b69a54ee | 906 | if (!saved_filename1 || !saved_filename2) |
ca0b7df3 TH |
907 | goto out; |
908 | if (!is_delete) | |
909 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); | |
f737d95d | 910 | mutex_lock(&tomoyo_policy_lock); |
fdb8ebb7 | 911 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
912 | struct tomoyo_path2_acl *acl = |
913 | container_of(ptr, struct tomoyo_path2_acl, head); | |
914 | if (ptr->type != TOMOYO_TYPE_PATH2_ACL) | |
b69a54ee | 915 | continue; |
b69a54ee KT |
916 | if (acl->filename1 != saved_filename1 || |
917 | acl->filename2 != saved_filename2) | |
918 | continue; | |
ca0b7df3 TH |
919 | if (is_delete) |
920 | acl->perm &= ~perm; | |
921 | else | |
922 | acl->perm |= perm; | |
b69a54ee | 923 | error = 0; |
ca0b7df3 | 924 | break; |
cd7bec6a | 925 | } |
ca0b7df3 | 926 | if (!is_delete && error && tomoyo_memory_ok(entry)) { |
7ef61233 | 927 | entry->head.type = TOMOYO_TYPE_PATH2_ACL; |
ca0b7df3 TH |
928 | entry->perm = perm; |
929 | entry->filename1 = saved_filename1; | |
bf24fb01 | 930 | saved_filename1 = NULL; |
ca0b7df3 | 931 | entry->filename2 = saved_filename2; |
bf24fb01 | 932 | saved_filename2 = NULL; |
ca0b7df3 TH |
933 | list_add_tail_rcu(&entry->head.list, &domain->acl_info_list); |
934 | entry = NULL; | |
b69a54ee | 935 | error = 0; |
b69a54ee | 936 | } |
f737d95d | 937 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 938 | out: |
bf24fb01 TH |
939 | tomoyo_put_name(saved_filename1); |
940 | tomoyo_put_name(saved_filename2); | |
ca0b7df3 | 941 | kfree(entry); |
b69a54ee KT |
942 | return error; |
943 | } | |
944 | ||
945 | /** | |
7ef61233 | 946 | * tomoyo_path_acl - Check permission for single path operation. |
b69a54ee KT |
947 | * |
948 | * @domain: Pointer to "struct tomoyo_domain_info". | |
949 | * @type: Type of operation. | |
950 | * @filename: Filename to check. | |
951 | * | |
952 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
953 | * |
954 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 955 | */ |
7ef61233 TH |
956 | static int tomoyo_path_acl(struct tomoyo_domain_info *domain, const u8 type, |
957 | const struct tomoyo_path_info *filename) | |
b69a54ee KT |
958 | { |
959 | if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) | |
960 | return 0; | |
7ef61233 | 961 | return tomoyo_path_acl2(domain, filename, 1 << type, 1); |
b69a54ee KT |
962 | } |
963 | ||
964 | /** | |
7ef61233 | 965 | * tomoyo_path2_acl - Check permission for double path operation. |
b69a54ee KT |
966 | * |
967 | * @domain: Pointer to "struct tomoyo_domain_info". | |
968 | * @type: Type of operation. | |
969 | * @filename1: First filename to check. | |
970 | * @filename2: Second filename to check. | |
971 | * | |
972 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
973 | * |
974 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 975 | */ |
7ef61233 TH |
976 | static int tomoyo_path2_acl(const struct tomoyo_domain_info *domain, |
977 | const u8 type, | |
978 | const struct tomoyo_path_info *filename1, | |
979 | const struct tomoyo_path_info *filename2) | |
b69a54ee KT |
980 | { |
981 | struct tomoyo_acl_info *ptr; | |
982 | const u8 perm = 1 << type; | |
983 | int error = -EPERM; | |
984 | ||
985 | if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) | |
986 | return 0; | |
fdb8ebb7 | 987 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
988 | struct tomoyo_path2_acl *acl; |
989 | if (ptr->type != TOMOYO_TYPE_PATH2_ACL) | |
b69a54ee | 990 | continue; |
7ef61233 | 991 | acl = container_of(ptr, struct tomoyo_path2_acl, head); |
b69a54ee KT |
992 | if (!(acl->perm & perm)) |
993 | continue; | |
994 | if (!tomoyo_path_matches_pattern(filename1, acl->filename1)) | |
995 | continue; | |
996 | if (!tomoyo_path_matches_pattern(filename2, acl->filename2)) | |
997 | continue; | |
998 | error = 0; | |
999 | break; | |
1000 | } | |
b69a54ee KT |
1001 | return error; |
1002 | } | |
1003 | ||
1004 | /** | |
7ef61233 | 1005 | * tomoyo_path_permission2 - Check permission for single path operation. |
b69a54ee KT |
1006 | * |
1007 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1008 | * @operation: Type of operation. | |
1009 | * @filename: Filename to check. | |
1010 | * @mode: Access control mode. | |
1011 | * | |
1012 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1013 | * |
1014 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 1015 | */ |
7ef61233 TH |
1016 | static int tomoyo_path_permission2(struct tomoyo_domain_info *const domain, |
1017 | u8 operation, | |
1018 | const struct tomoyo_path_info *filename, | |
1019 | const u8 mode) | |
b69a54ee KT |
1020 | { |
1021 | const char *msg; | |
1022 | int error; | |
1023 | const bool is_enforce = (mode == 3); | |
1024 | ||
1025 | if (!mode) | |
1026 | return 0; | |
1027 | next: | |
7ef61233 TH |
1028 | error = tomoyo_path_acl(domain, operation, filename); |
1029 | msg = tomoyo_path2keyword(operation); | |
b69a54ee KT |
1030 | if (!error) |
1031 | goto ok; | |
1032 | if (tomoyo_verbose_mode(domain)) | |
1033 | printk(KERN_WARNING "TOMOYO-%s: Access '%s %s' denied for %s\n", | |
1034 | tomoyo_get_msg(is_enforce), msg, filename->name, | |
1035 | tomoyo_get_last_name(domain)); | |
1036 | if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { | |
1037 | const char *name = tomoyo_get_file_pattern(filename)->name; | |
7ef61233 | 1038 | tomoyo_update_path_acl(operation, name, domain, false); |
b69a54ee KT |
1039 | } |
1040 | if (!is_enforce) | |
1041 | error = 0; | |
1042 | ok: | |
1043 | /* | |
1044 | * Since "allow_truncate" doesn't imply "allow_rewrite" permission, | |
1045 | * we need to check "allow_rewrite" permission if the filename is | |
1046 | * specified by "deny_rewrite" keyword. | |
1047 | */ | |
7ef61233 | 1048 | if (!error && operation == TOMOYO_TYPE_TRUNCATE && |
b69a54ee | 1049 | tomoyo_is_no_rewrite_file(filename)) { |
7ef61233 | 1050 | operation = TOMOYO_TYPE_REWRITE; |
b69a54ee KT |
1051 | goto next; |
1052 | } | |
1053 | return error; | |
1054 | } | |
1055 | ||
b69a54ee KT |
1056 | /** |
1057 | * tomoyo_check_exec_perm - Check permission for "execute". | |
1058 | * | |
1059 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1060 | * @filename: Check permission for "execute". | |
b69a54ee KT |
1061 | * |
1062 | * Returns 0 on success, negativevalue otherwise. | |
fdb8ebb7 TH |
1063 | * |
1064 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
1065 | */ |
1066 | int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain, | |
bcb86975 | 1067 | const struct tomoyo_path_info *filename) |
b69a54ee KT |
1068 | { |
1069 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1070 | ||
1071 | if (!mode) | |
1072 | return 0; | |
1073 | return tomoyo_check_file_perm2(domain, filename, 1, "do_execve", mode); | |
1074 | } | |
1075 | ||
1076 | /** | |
1077 | * tomoyo_check_open_permission - Check permission for "read" and "write". | |
1078 | * | |
1079 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1080 | * @path: Pointer to "struct path". | |
1081 | * @flag: Flags for open(). | |
1082 | * | |
1083 | * Returns 0 on success, negative value otherwise. | |
1084 | */ | |
1085 | int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, | |
1086 | struct path *path, const int flag) | |
1087 | { | |
1088 | const u8 acc_mode = ACC_MODE(flag); | |
1089 | int error = -ENOMEM; | |
1090 | struct tomoyo_path_info *buf; | |
1091 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1092 | const bool is_enforce = (mode == 3); | |
fdb8ebb7 | 1093 | int idx; |
b69a54ee KT |
1094 | |
1095 | if (!mode || !path->mnt) | |
1096 | return 0; | |
1097 | if (acc_mode == 0) | |
1098 | return 0; | |
1099 | if (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode)) | |
1100 | /* | |
1101 | * I don't check directories here because mkdir() and rmdir() | |
1102 | * don't call me. | |
1103 | */ | |
1104 | return 0; | |
fdb8ebb7 | 1105 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1106 | buf = tomoyo_get_path(path); |
1107 | if (!buf) | |
1108 | goto out; | |
1109 | error = 0; | |
1110 | /* | |
1111 | * If the filename is specified by "deny_rewrite" keyword, | |
1112 | * we need to check "allow_rewrite" permission when the filename is not | |
1113 | * opened for append mode or the filename is truncated at open time. | |
1114 | */ | |
1115 | if ((acc_mode & MAY_WRITE) && | |
1116 | ((flag & O_TRUNC) || !(flag & O_APPEND)) && | |
1117 | (tomoyo_is_no_rewrite_file(buf))) { | |
7ef61233 TH |
1118 | error = tomoyo_path_permission2(domain, TOMOYO_TYPE_REWRITE, |
1119 | buf, mode); | |
b69a54ee KT |
1120 | } |
1121 | if (!error) | |
1122 | error = tomoyo_check_file_perm2(domain, buf, acc_mode, "open", | |
1123 | mode); | |
1124 | if (!error && (flag & O_TRUNC)) | |
7ef61233 TH |
1125 | error = tomoyo_path_permission2(domain, TOMOYO_TYPE_TRUNCATE, |
1126 | buf, mode); | |
b69a54ee | 1127 | out: |
8e2d39a1 | 1128 | kfree(buf); |
fdb8ebb7 | 1129 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1130 | if (!is_enforce) |
1131 | error = 0; | |
1132 | return error; | |
1133 | } | |
1134 | ||
1135 | /** | |
7ef61233 | 1136 | * 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 | 1137 | * |
b69a54ee KT |
1138 | * @operation: Type of operation. |
1139 | * @path: Pointer to "struct path". | |
1140 | * | |
1141 | * Returns 0 on success, negative value otherwise. | |
1142 | */ | |
97d6931e | 1143 | int tomoyo_path_perm(const u8 operation, struct path *path) |
b69a54ee KT |
1144 | { |
1145 | int error = -ENOMEM; | |
1146 | struct tomoyo_path_info *buf; | |
97d6931e | 1147 | struct tomoyo_domain_info *domain = tomoyo_domain(); |
b69a54ee KT |
1148 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); |
1149 | const bool is_enforce = (mode == 3); | |
fdb8ebb7 | 1150 | int idx; |
b69a54ee KT |
1151 | |
1152 | if (!mode || !path->mnt) | |
1153 | return 0; | |
fdb8ebb7 | 1154 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1155 | buf = tomoyo_get_path(path); |
1156 | if (!buf) | |
1157 | goto out; | |
1158 | switch (operation) { | |
7ef61233 TH |
1159 | case TOMOYO_TYPE_MKDIR: |
1160 | case TOMOYO_TYPE_RMDIR: | |
1161 | case TOMOYO_TYPE_CHROOT: | |
b69a54ee KT |
1162 | if (!buf->is_dir) { |
1163 | /* | |
1164 | * tomoyo_get_path() reserves space for appending "/." | |
1165 | */ | |
1166 | strcat((char *) buf->name, "/"); | |
1167 | tomoyo_fill_path_info(buf); | |
1168 | } | |
1169 | } | |
7ef61233 | 1170 | error = tomoyo_path_permission2(domain, operation, buf, mode); |
b69a54ee | 1171 | out: |
8e2d39a1 | 1172 | kfree(buf); |
fdb8ebb7 | 1173 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1174 | if (!is_enforce) |
1175 | error = 0; | |
1176 | return error; | |
1177 | } | |
1178 | ||
1179 | /** | |
1180 | * tomoyo_check_rewrite_permission - Check permission for "rewrite". | |
1181 | * | |
b69a54ee KT |
1182 | * @filp: Pointer to "struct file". |
1183 | * | |
1184 | * Returns 0 on success, negative value otherwise. | |
1185 | */ | |
97d6931e | 1186 | int tomoyo_check_rewrite_permission(struct file *filp) |
b69a54ee KT |
1187 | { |
1188 | int error = -ENOMEM; | |
97d6931e | 1189 | struct tomoyo_domain_info *domain = tomoyo_domain(); |
b69a54ee KT |
1190 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); |
1191 | const bool is_enforce = (mode == 3); | |
1192 | struct tomoyo_path_info *buf; | |
fdb8ebb7 | 1193 | int idx; |
b69a54ee KT |
1194 | |
1195 | if (!mode || !filp->f_path.mnt) | |
1196 | return 0; | |
fdb8ebb7 TH |
1197 | |
1198 | idx = tomoyo_read_lock(); | |
b69a54ee KT |
1199 | buf = tomoyo_get_path(&filp->f_path); |
1200 | if (!buf) | |
1201 | goto out; | |
1202 | if (!tomoyo_is_no_rewrite_file(buf)) { | |
1203 | error = 0; | |
1204 | goto out; | |
1205 | } | |
7ef61233 | 1206 | error = tomoyo_path_permission2(domain, TOMOYO_TYPE_REWRITE, buf, mode); |
b69a54ee | 1207 | out: |
8e2d39a1 | 1208 | kfree(buf); |
fdb8ebb7 | 1209 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1210 | if (!is_enforce) |
1211 | error = 0; | |
1212 | return error; | |
1213 | } | |
1214 | ||
1215 | /** | |
7ef61233 | 1216 | * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root". |
b69a54ee | 1217 | * |
b69a54ee KT |
1218 | * @operation: Type of operation. |
1219 | * @path1: Pointer to "struct path". | |
1220 | * @path2: Pointer to "struct path". | |
1221 | * | |
1222 | * Returns 0 on success, negative value otherwise. | |
1223 | */ | |
97d6931e | 1224 | int tomoyo_path2_perm(const u8 operation, struct path *path1, |
7ef61233 | 1225 | struct path *path2) |
b69a54ee KT |
1226 | { |
1227 | int error = -ENOMEM; | |
1228 | struct tomoyo_path_info *buf1, *buf2; | |
97d6931e | 1229 | struct tomoyo_domain_info *domain = tomoyo_domain(); |
b69a54ee KT |
1230 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); |
1231 | const bool is_enforce = (mode == 3); | |
1232 | const char *msg; | |
fdb8ebb7 | 1233 | int idx; |
b69a54ee KT |
1234 | |
1235 | if (!mode || !path1->mnt || !path2->mnt) | |
1236 | return 0; | |
fdb8ebb7 | 1237 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1238 | buf1 = tomoyo_get_path(path1); |
1239 | buf2 = tomoyo_get_path(path2); | |
1240 | if (!buf1 || !buf2) | |
1241 | goto out; | |
1242 | { | |
1243 | struct dentry *dentry = path1->dentry; | |
1244 | if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) { | |
1245 | /* | |
1246 | * tomoyo_get_path() reserves space for appending "/." | |
1247 | */ | |
1248 | if (!buf1->is_dir) { | |
1249 | strcat((char *) buf1->name, "/"); | |
1250 | tomoyo_fill_path_info(buf1); | |
1251 | } | |
1252 | if (!buf2->is_dir) { | |
1253 | strcat((char *) buf2->name, "/"); | |
1254 | tomoyo_fill_path_info(buf2); | |
1255 | } | |
1256 | } | |
1257 | } | |
7ef61233 TH |
1258 | error = tomoyo_path2_acl(domain, operation, buf1, buf2); |
1259 | msg = tomoyo_path22keyword(operation); | |
b69a54ee KT |
1260 | if (!error) |
1261 | goto out; | |
1262 | if (tomoyo_verbose_mode(domain)) | |
1263 | printk(KERN_WARNING "TOMOYO-%s: Access '%s %s %s' " | |
1264 | "denied for %s\n", tomoyo_get_msg(is_enforce), | |
1265 | msg, buf1->name, buf2->name, | |
1266 | tomoyo_get_last_name(domain)); | |
1267 | if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { | |
1268 | const char *name1 = tomoyo_get_file_pattern(buf1)->name; | |
1269 | const char *name2 = tomoyo_get_file_pattern(buf2)->name; | |
7ef61233 TH |
1270 | tomoyo_update_path2_acl(operation, name1, name2, domain, |
1271 | false); | |
b69a54ee KT |
1272 | } |
1273 | out: | |
8e2d39a1 TH |
1274 | kfree(buf1); |
1275 | kfree(buf2); | |
fdb8ebb7 | 1276 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1277 | if (!is_enforce) |
1278 | error = 0; | |
1279 | return error; | |
1280 | } |