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. */ | |
15 | static const char *tomoyo_sp_keyword[TOMOYO_MAX_SINGLE_PATH_OPERATION] = { | |
16 | [TOMOYO_TYPE_READ_WRITE_ACL] = "read/write", | |
17 | [TOMOYO_TYPE_EXECUTE_ACL] = "execute", | |
18 | [TOMOYO_TYPE_READ_ACL] = "read", | |
19 | [TOMOYO_TYPE_WRITE_ACL] = "write", | |
20 | [TOMOYO_TYPE_CREATE_ACL] = "create", | |
21 | [TOMOYO_TYPE_UNLINK_ACL] = "unlink", | |
22 | [TOMOYO_TYPE_MKDIR_ACL] = "mkdir", | |
23 | [TOMOYO_TYPE_RMDIR_ACL] = "rmdir", | |
24 | [TOMOYO_TYPE_MKFIFO_ACL] = "mkfifo", | |
25 | [TOMOYO_TYPE_MKSOCK_ACL] = "mksock", | |
26 | [TOMOYO_TYPE_MKBLOCK_ACL] = "mkblock", | |
27 | [TOMOYO_TYPE_MKCHAR_ACL] = "mkchar", | |
28 | [TOMOYO_TYPE_TRUNCATE_ACL] = "truncate", | |
29 | [TOMOYO_TYPE_SYMLINK_ACL] = "symlink", | |
30 | [TOMOYO_TYPE_REWRITE_ACL] = "rewrite", | |
937bf613 TH |
31 | [TOMOYO_TYPE_IOCTL_ACL] = "ioctl", |
32 | [TOMOYO_TYPE_CHMOD_ACL] = "chmod", | |
33 | [TOMOYO_TYPE_CHOWN_ACL] = "chown", | |
34 | [TOMOYO_TYPE_CHGRP_ACL] = "chgrp", | |
35 | [TOMOYO_TYPE_CHROOT_ACL] = "chroot", | |
36 | [TOMOYO_TYPE_MOUNT_ACL] = "mount", | |
37 | [TOMOYO_TYPE_UMOUNT_ACL] = "unmount", | |
b69a54ee KT |
38 | }; |
39 | ||
40 | /* Keyword array for double path operations. */ | |
41 | static const char *tomoyo_dp_keyword[TOMOYO_MAX_DOUBLE_PATH_OPERATION] = { | |
42 | [TOMOYO_TYPE_LINK_ACL] = "link", | |
43 | [TOMOYO_TYPE_RENAME_ACL] = "rename", | |
937bf613 | 44 | [TOMOYO_TYPE_PIVOT_ROOT_ACL] = "pivot_root", |
b69a54ee KT |
45 | }; |
46 | ||
47 | /** | |
48 | * tomoyo_sp2keyword - Get the name of single path operation. | |
49 | * | |
50 | * @operation: Type of operation. | |
51 | * | |
52 | * Returns the name of single path operation. | |
53 | */ | |
54 | const char *tomoyo_sp2keyword(const u8 operation) | |
55 | { | |
56 | return (operation < TOMOYO_MAX_SINGLE_PATH_OPERATION) | |
57 | ? tomoyo_sp_keyword[operation] : NULL; | |
58 | } | |
59 | ||
60 | /** | |
61 | * tomoyo_dp2keyword - Get the name of double path operation. | |
62 | * | |
63 | * @operation: Type of operation. | |
64 | * | |
65 | * Returns the name of double path operation. | |
66 | */ | |
67 | const char *tomoyo_dp2keyword(const u8 operation) | |
68 | { | |
69 | return (operation < TOMOYO_MAX_DOUBLE_PATH_OPERATION) | |
70 | ? tomoyo_dp_keyword[operation] : NULL; | |
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 | ||
b69a54ee KT |
118 | static int tomoyo_update_double_path_acl(const u8 type, const char *filename1, |
119 | const char *filename2, | |
120 | struct tomoyo_domain_info * | |
121 | const domain, const bool is_delete); | |
122 | static int tomoyo_update_single_path_acl(const u8 type, const char *filename, | |
123 | struct tomoyo_domain_info * | |
124 | const domain, const bool is_delete); | |
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 KT |
170 | |
171 | if (!tomoyo_is_correct_path(filename, 1, 0, -1, __func__)) | |
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 KT |
470 | |
471 | if (!tomoyo_is_correct_path(pattern, 0, 0, 0, __func__)) | |
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) | |
600 | tomoyo_update_single_path_acl(TOMOYO_TYPE_READ_ACL, filename, | |
601 | domain, is_delete); | |
602 | if (perm & 2) | |
603 | tomoyo_update_single_path_acl(TOMOYO_TYPE_WRITE_ACL, filename, | |
604 | domain, is_delete); | |
605 | if (perm & 1) | |
606 | tomoyo_update_single_path_acl(TOMOYO_TYPE_EXECUTE_ACL, | |
607 | filename, domain, is_delete); | |
608 | return 0; | |
609 | } | |
610 | ||
611 | /** | |
612 | * tomoyo_check_single_path_acl2 - Check permission for single path operation. | |
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 KT |
622 | */ |
623 | static int tomoyo_check_single_path_acl2(const struct tomoyo_domain_info * | |
624 | domain, | |
625 | const struct tomoyo_path_info * | |
626 | filename, | |
937bf613 | 627 | const u32 perm, |
b69a54ee KT |
628 | const bool may_use_pattern) |
629 | { | |
630 | struct tomoyo_acl_info *ptr; | |
631 | int error = -EPERM; | |
632 | ||
fdb8ebb7 | 633 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
b69a54ee | 634 | struct tomoyo_single_path_acl_record *acl; |
ea13ddba | 635 | if (ptr->type != TOMOYO_TYPE_SINGLE_PATH_ACL) |
b69a54ee KT |
636 | continue; |
637 | acl = container_of(ptr, struct tomoyo_single_path_acl_record, | |
638 | head); | |
937bf613 TH |
639 | if (perm <= 0xFFFF) { |
640 | if (!(acl->perm & perm)) | |
641 | continue; | |
642 | } else { | |
643 | if (!(acl->perm_high & (perm >> 16))) | |
644 | continue; | |
645 | } | |
b69a54ee KT |
646 | if (may_use_pattern || !acl->filename->is_patterned) { |
647 | if (!tomoyo_path_matches_pattern(filename, | |
648 | acl->filename)) | |
649 | continue; | |
650 | } else { | |
651 | continue; | |
652 | } | |
653 | error = 0; | |
654 | break; | |
655 | } | |
b69a54ee KT |
656 | return error; |
657 | } | |
658 | ||
659 | /** | |
660 | * tomoyo_check_file_acl - Check permission for opening files. | |
661 | * | |
662 | * @domain: Pointer to "struct tomoyo_domain_info". | |
663 | * @filename: Filename to check. | |
664 | * @operation: Mode ("read" or "write" or "read/write" or "execute"). | |
665 | * | |
666 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
667 | * |
668 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
669 | */ |
670 | static int tomoyo_check_file_acl(const struct tomoyo_domain_info *domain, | |
671 | const struct tomoyo_path_info *filename, | |
672 | const u8 operation) | |
673 | { | |
937bf613 | 674 | u32 perm = 0; |
b69a54ee KT |
675 | |
676 | if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) | |
677 | return 0; | |
678 | if (operation == 6) | |
679 | perm = 1 << TOMOYO_TYPE_READ_WRITE_ACL; | |
680 | else if (operation == 4) | |
681 | perm = 1 << TOMOYO_TYPE_READ_ACL; | |
682 | else if (operation == 2) | |
683 | perm = 1 << TOMOYO_TYPE_WRITE_ACL; | |
684 | else if (operation == 1) | |
685 | perm = 1 << TOMOYO_TYPE_EXECUTE_ACL; | |
686 | else | |
687 | BUG(); | |
688 | return tomoyo_check_single_path_acl2(domain, filename, perm, | |
689 | operation != 1); | |
690 | } | |
691 | ||
692 | /** | |
693 | * tomoyo_check_file_perm2 - Check permission for opening files. | |
694 | * | |
695 | * @domain: Pointer to "struct tomoyo_domain_info". | |
696 | * @filename: Filename to check. | |
697 | * @perm: Mode ("read" or "write" or "read/write" or "execute"). | |
698 | * @operation: Operation name passed used for verbose mode. | |
699 | * @mode: Access control mode. | |
700 | * | |
701 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
702 | * |
703 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
704 | */ |
705 | static int tomoyo_check_file_perm2(struct tomoyo_domain_info * const domain, | |
706 | const struct tomoyo_path_info *filename, | |
707 | const u8 perm, const char *operation, | |
708 | const u8 mode) | |
709 | { | |
710 | const bool is_enforce = (mode == 3); | |
711 | const char *msg = "<unknown>"; | |
712 | int error = 0; | |
713 | ||
714 | if (!filename) | |
715 | return 0; | |
716 | error = tomoyo_check_file_acl(domain, filename, perm); | |
ea13ddba | 717 | if (error && perm == 4 && !domain->ignore_global_allow_read |
b69a54ee KT |
718 | && tomoyo_is_globally_readable_file(filename)) |
719 | error = 0; | |
720 | if (perm == 6) | |
721 | msg = tomoyo_sp2keyword(TOMOYO_TYPE_READ_WRITE_ACL); | |
722 | else if (perm == 4) | |
723 | msg = tomoyo_sp2keyword(TOMOYO_TYPE_READ_ACL); | |
724 | else if (perm == 2) | |
725 | msg = tomoyo_sp2keyword(TOMOYO_TYPE_WRITE_ACL); | |
726 | else if (perm == 1) | |
727 | msg = tomoyo_sp2keyword(TOMOYO_TYPE_EXECUTE_ACL); | |
728 | else | |
729 | BUG(); | |
730 | if (!error) | |
731 | return 0; | |
732 | if (tomoyo_verbose_mode(domain)) | |
733 | printk(KERN_WARNING "TOMOYO-%s: Access '%s(%s) %s' denied " | |
734 | "for %s\n", tomoyo_get_msg(is_enforce), msg, operation, | |
735 | filename->name, tomoyo_get_last_name(domain)); | |
736 | if (is_enforce) | |
737 | return error; | |
738 | if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { | |
739 | /* Don't use patterns for execute permission. */ | |
740 | const struct tomoyo_path_info *patterned_file = (perm != 1) ? | |
741 | tomoyo_get_file_pattern(filename) : filename; | |
742 | tomoyo_update_file_acl(patterned_file->name, perm, | |
743 | domain, false); | |
744 | } | |
745 | return 0; | |
746 | } | |
747 | ||
748 | /** | |
749 | * tomoyo_write_file_policy - Update file related list. | |
750 | * | |
751 | * @data: String to parse. | |
752 | * @domain: Pointer to "struct tomoyo_domain_info". | |
753 | * @is_delete: True if it is a delete request. | |
754 | * | |
755 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
756 | * |
757 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
758 | */ |
759 | int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, | |
760 | const bool is_delete) | |
761 | { | |
762 | char *filename = strchr(data, ' '); | |
763 | char *filename2; | |
764 | unsigned int perm; | |
765 | u8 type; | |
766 | ||
767 | if (!filename) | |
768 | return -EINVAL; | |
769 | *filename++ = '\0'; | |
770 | if (sscanf(data, "%u", &perm) == 1) | |
771 | return tomoyo_update_file_acl(filename, (u8) perm, domain, | |
772 | is_delete); | |
773 | if (strncmp(data, "allow_", 6)) | |
774 | goto out; | |
775 | data += 6; | |
776 | for (type = 0; type < TOMOYO_MAX_SINGLE_PATH_OPERATION; type++) { | |
777 | if (strcmp(data, tomoyo_sp_keyword[type])) | |
778 | continue; | |
779 | return tomoyo_update_single_path_acl(type, filename, | |
780 | domain, is_delete); | |
781 | } | |
782 | filename2 = strchr(filename, ' '); | |
783 | if (!filename2) | |
784 | goto out; | |
785 | *filename2++ = '\0'; | |
786 | for (type = 0; type < TOMOYO_MAX_DOUBLE_PATH_OPERATION; type++) { | |
787 | if (strcmp(data, tomoyo_dp_keyword[type])) | |
788 | continue; | |
789 | return tomoyo_update_double_path_acl(type, filename, filename2, | |
790 | domain, is_delete); | |
791 | } | |
792 | out: | |
793 | return -EINVAL; | |
794 | } | |
795 | ||
796 | /** | |
797 | * tomoyo_update_single_path_acl - Update "struct tomoyo_single_path_acl_record" list. | |
798 | * | |
799 | * @type: Type of operation. | |
800 | * @filename: Filename. | |
801 | * @domain: Pointer to "struct tomoyo_domain_info". | |
802 | * @is_delete: True if it is a delete request. | |
803 | * | |
804 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
805 | * |
806 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
807 | */ |
808 | static int tomoyo_update_single_path_acl(const u8 type, const char *filename, | |
809 | struct tomoyo_domain_info * | |
810 | const domain, const bool is_delete) | |
811 | { | |
937bf613 | 812 | static const u32 rw_mask = |
b69a54ee KT |
813 | (1 << TOMOYO_TYPE_READ_ACL) | (1 << TOMOYO_TYPE_WRITE_ACL); |
814 | const struct tomoyo_path_info *saved_filename; | |
815 | struct tomoyo_acl_info *ptr; | |
ca0b7df3 TH |
816 | struct tomoyo_single_path_acl_record *entry = NULL; |
817 | int error = is_delete ? -ENOENT : -ENOMEM; | |
937bf613 | 818 | const u32 perm = 1 << type; |
b69a54ee KT |
819 | |
820 | if (!domain) | |
821 | return -EINVAL; | |
822 | if (!tomoyo_is_correct_path(filename, 0, 0, 0, __func__)) | |
823 | return -EINVAL; | |
bf24fb01 | 824 | saved_filename = tomoyo_get_name(filename); |
b69a54ee KT |
825 | if (!saved_filename) |
826 | return -ENOMEM; | |
ca0b7df3 TH |
827 | if (!is_delete) |
828 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); | |
f737d95d | 829 | mutex_lock(&tomoyo_policy_lock); |
fdb8ebb7 | 830 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
ca0b7df3 TH |
831 | struct tomoyo_single_path_acl_record *acl = |
832 | container_of(ptr, struct tomoyo_single_path_acl_record, | |
833 | head); | |
ea13ddba | 834 | if (ptr->type != TOMOYO_TYPE_SINGLE_PATH_ACL) |
b69a54ee | 835 | continue; |
b69a54ee KT |
836 | if (acl->filename != saved_filename) |
837 | continue; | |
ca0b7df3 TH |
838 | if (is_delete) { |
839 | if (perm <= 0xFFFF) | |
840 | acl->perm &= ~perm; | |
841 | else | |
842 | acl->perm_high &= ~(perm >> 16); | |
843 | if ((acl->perm & rw_mask) != rw_mask) | |
844 | acl->perm &= ~(1 << TOMOYO_TYPE_READ_WRITE_ACL); | |
845 | else if (!(acl->perm & | |
846 | (1 << TOMOYO_TYPE_READ_WRITE_ACL))) | |
847 | acl->perm &= ~rw_mask; | |
848 | } else { | |
849 | if (perm <= 0xFFFF) | |
850 | acl->perm |= perm; | |
851 | else | |
852 | acl->perm_high |= (perm >> 16); | |
853 | if ((acl->perm & rw_mask) == rw_mask) | |
854 | acl->perm |= 1 << TOMOYO_TYPE_READ_WRITE_ACL; | |
855 | else if (acl->perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL)) | |
856 | acl->perm |= rw_mask; | |
857 | } | |
b69a54ee | 858 | error = 0; |
ca0b7df3 | 859 | break; |
cd7bec6a | 860 | } |
ca0b7df3 TH |
861 | if (!is_delete && error && tomoyo_memory_ok(entry)) { |
862 | entry->head.type = TOMOYO_TYPE_SINGLE_PATH_ACL; | |
937bf613 | 863 | if (perm <= 0xFFFF) |
ca0b7df3 | 864 | entry->perm = perm; |
937bf613 | 865 | else |
ca0b7df3 TH |
866 | entry->perm_high = (perm >> 16); |
867 | if (perm == (1 << TOMOYO_TYPE_READ_WRITE_ACL)) | |
868 | entry->perm |= rw_mask; | |
869 | entry->filename = saved_filename; | |
bf24fb01 | 870 | saved_filename = NULL; |
ca0b7df3 TH |
871 | list_add_tail_rcu(&entry->head.list, &domain->acl_info_list); |
872 | entry = NULL; | |
b69a54ee | 873 | error = 0; |
b69a54ee | 874 | } |
f737d95d | 875 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 876 | kfree(entry); |
bf24fb01 | 877 | tomoyo_put_name(saved_filename); |
b69a54ee KT |
878 | return error; |
879 | } | |
880 | ||
881 | /** | |
882 | * tomoyo_update_double_path_acl - Update "struct tomoyo_double_path_acl_record" list. | |
883 | * | |
884 | * @type: Type of operation. | |
885 | * @filename1: First filename. | |
886 | * @filename2: Second filename. | |
887 | * @domain: Pointer to "struct tomoyo_domain_info". | |
888 | * @is_delete: True if it is a delete request. | |
889 | * | |
890 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
891 | * |
892 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
893 | */ |
894 | static int tomoyo_update_double_path_acl(const u8 type, const char *filename1, | |
895 | const char *filename2, | |
896 | struct tomoyo_domain_info * | |
897 | const domain, const bool is_delete) | |
898 | { | |
899 | const struct tomoyo_path_info *saved_filename1; | |
900 | const struct tomoyo_path_info *saved_filename2; | |
901 | struct tomoyo_acl_info *ptr; | |
ca0b7df3 TH |
902 | struct tomoyo_double_path_acl_record *entry = NULL; |
903 | int error = is_delete ? -ENOENT : -ENOMEM; | |
b69a54ee KT |
904 | const u8 perm = 1 << type; |
905 | ||
906 | if (!domain) | |
907 | return -EINVAL; | |
908 | if (!tomoyo_is_correct_path(filename1, 0, 0, 0, __func__) || | |
909 | !tomoyo_is_correct_path(filename2, 0, 0, 0, __func__)) | |
910 | return -EINVAL; | |
bf24fb01 TH |
911 | saved_filename1 = tomoyo_get_name(filename1); |
912 | saved_filename2 = tomoyo_get_name(filename2); | |
b69a54ee | 913 | if (!saved_filename1 || !saved_filename2) |
ca0b7df3 TH |
914 | goto out; |
915 | if (!is_delete) | |
916 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); | |
f737d95d | 917 | mutex_lock(&tomoyo_policy_lock); |
fdb8ebb7 | 918 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
ca0b7df3 TH |
919 | struct tomoyo_double_path_acl_record *acl = |
920 | container_of(ptr, struct tomoyo_double_path_acl_record, | |
921 | head); | |
ea13ddba | 922 | if (ptr->type != TOMOYO_TYPE_DOUBLE_PATH_ACL) |
b69a54ee | 923 | continue; |
b69a54ee KT |
924 | if (acl->filename1 != saved_filename1 || |
925 | acl->filename2 != saved_filename2) | |
926 | continue; | |
ca0b7df3 TH |
927 | if (is_delete) |
928 | acl->perm &= ~perm; | |
929 | else | |
930 | acl->perm |= perm; | |
b69a54ee | 931 | error = 0; |
ca0b7df3 | 932 | break; |
cd7bec6a | 933 | } |
ca0b7df3 TH |
934 | if (!is_delete && error && tomoyo_memory_ok(entry)) { |
935 | entry->head.type = TOMOYO_TYPE_DOUBLE_PATH_ACL; | |
936 | entry->perm = perm; | |
937 | entry->filename1 = saved_filename1; | |
bf24fb01 | 938 | saved_filename1 = NULL; |
ca0b7df3 | 939 | entry->filename2 = saved_filename2; |
bf24fb01 | 940 | saved_filename2 = NULL; |
ca0b7df3 TH |
941 | list_add_tail_rcu(&entry->head.list, &domain->acl_info_list); |
942 | entry = NULL; | |
b69a54ee | 943 | error = 0; |
b69a54ee | 944 | } |
f737d95d | 945 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 946 | out: |
bf24fb01 TH |
947 | tomoyo_put_name(saved_filename1); |
948 | tomoyo_put_name(saved_filename2); | |
ca0b7df3 | 949 | kfree(entry); |
b69a54ee KT |
950 | return error; |
951 | } | |
952 | ||
953 | /** | |
954 | * tomoyo_check_single_path_acl - Check permission for single path operation. | |
955 | * | |
956 | * @domain: Pointer to "struct tomoyo_domain_info". | |
957 | * @type: Type of operation. | |
958 | * @filename: Filename to check. | |
959 | * | |
960 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
961 | * |
962 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
963 | */ |
964 | static int tomoyo_check_single_path_acl(struct tomoyo_domain_info *domain, | |
965 | const u8 type, | |
966 | const struct tomoyo_path_info *filename) | |
967 | { | |
968 | if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) | |
969 | return 0; | |
970 | return tomoyo_check_single_path_acl2(domain, filename, 1 << type, 1); | |
971 | } | |
972 | ||
973 | /** | |
974 | * tomoyo_check_double_path_acl - Check permission for double path operation. | |
975 | * | |
976 | * @domain: Pointer to "struct tomoyo_domain_info". | |
977 | * @type: Type of operation. | |
978 | * @filename1: First filename to check. | |
979 | * @filename2: Second filename to check. | |
980 | * | |
981 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
982 | * |
983 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
984 | */ |
985 | static int tomoyo_check_double_path_acl(const struct tomoyo_domain_info *domain, | |
986 | const u8 type, | |
987 | const struct tomoyo_path_info * | |
988 | filename1, | |
989 | const struct tomoyo_path_info * | |
990 | filename2) | |
991 | { | |
992 | struct tomoyo_acl_info *ptr; | |
993 | const u8 perm = 1 << type; | |
994 | int error = -EPERM; | |
995 | ||
996 | if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) | |
997 | return 0; | |
fdb8ebb7 | 998 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
b69a54ee | 999 | struct tomoyo_double_path_acl_record *acl; |
ea13ddba | 1000 | if (ptr->type != TOMOYO_TYPE_DOUBLE_PATH_ACL) |
b69a54ee KT |
1001 | continue; |
1002 | acl = container_of(ptr, struct tomoyo_double_path_acl_record, | |
1003 | head); | |
1004 | if (!(acl->perm & perm)) | |
1005 | continue; | |
1006 | if (!tomoyo_path_matches_pattern(filename1, acl->filename1)) | |
1007 | continue; | |
1008 | if (!tomoyo_path_matches_pattern(filename2, acl->filename2)) | |
1009 | continue; | |
1010 | error = 0; | |
1011 | break; | |
1012 | } | |
b69a54ee KT |
1013 | return error; |
1014 | } | |
1015 | ||
1016 | /** | |
1017 | * tomoyo_check_single_path_permission2 - Check permission for single path operation. | |
1018 | * | |
1019 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1020 | * @operation: Type of operation. | |
1021 | * @filename: Filename to check. | |
1022 | * @mode: Access control mode. | |
1023 | * | |
1024 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1025 | * |
1026 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
1027 | */ |
1028 | static int tomoyo_check_single_path_permission2(struct tomoyo_domain_info * | |
1029 | const domain, u8 operation, | |
1030 | const struct tomoyo_path_info * | |
1031 | filename, const u8 mode) | |
1032 | { | |
1033 | const char *msg; | |
1034 | int error; | |
1035 | const bool is_enforce = (mode == 3); | |
1036 | ||
1037 | if (!mode) | |
1038 | return 0; | |
1039 | next: | |
1040 | error = tomoyo_check_single_path_acl(domain, operation, filename); | |
1041 | msg = tomoyo_sp2keyword(operation); | |
1042 | if (!error) | |
1043 | goto ok; | |
1044 | if (tomoyo_verbose_mode(domain)) | |
1045 | printk(KERN_WARNING "TOMOYO-%s: Access '%s %s' denied for %s\n", | |
1046 | tomoyo_get_msg(is_enforce), msg, filename->name, | |
1047 | tomoyo_get_last_name(domain)); | |
1048 | if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { | |
1049 | const char *name = tomoyo_get_file_pattern(filename)->name; | |
1050 | tomoyo_update_single_path_acl(operation, name, domain, false); | |
1051 | } | |
1052 | if (!is_enforce) | |
1053 | error = 0; | |
1054 | ok: | |
1055 | /* | |
1056 | * Since "allow_truncate" doesn't imply "allow_rewrite" permission, | |
1057 | * we need to check "allow_rewrite" permission if the filename is | |
1058 | * specified by "deny_rewrite" keyword. | |
1059 | */ | |
1060 | if (!error && operation == TOMOYO_TYPE_TRUNCATE_ACL && | |
1061 | tomoyo_is_no_rewrite_file(filename)) { | |
1062 | operation = TOMOYO_TYPE_REWRITE_ACL; | |
1063 | goto next; | |
1064 | } | |
1065 | return error; | |
1066 | } | |
1067 | ||
b69a54ee KT |
1068 | /** |
1069 | * tomoyo_check_exec_perm - Check permission for "execute". | |
1070 | * | |
1071 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1072 | * @filename: Check permission for "execute". | |
b69a54ee KT |
1073 | * |
1074 | * Returns 0 on success, negativevalue otherwise. | |
fdb8ebb7 TH |
1075 | * |
1076 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
1077 | */ |
1078 | int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain, | |
bcb86975 | 1079 | const struct tomoyo_path_info *filename) |
b69a54ee KT |
1080 | { |
1081 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1082 | ||
1083 | if (!mode) | |
1084 | return 0; | |
1085 | return tomoyo_check_file_perm2(domain, filename, 1, "do_execve", mode); | |
1086 | } | |
1087 | ||
1088 | /** | |
1089 | * tomoyo_check_open_permission - Check permission for "read" and "write". | |
1090 | * | |
1091 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1092 | * @path: Pointer to "struct path". | |
1093 | * @flag: Flags for open(). | |
1094 | * | |
1095 | * Returns 0 on success, negative value otherwise. | |
1096 | */ | |
1097 | int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, | |
1098 | struct path *path, const int flag) | |
1099 | { | |
1100 | const u8 acc_mode = ACC_MODE(flag); | |
1101 | int error = -ENOMEM; | |
1102 | struct tomoyo_path_info *buf; | |
1103 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1104 | const bool is_enforce = (mode == 3); | |
fdb8ebb7 | 1105 | int idx; |
b69a54ee KT |
1106 | |
1107 | if (!mode || !path->mnt) | |
1108 | return 0; | |
1109 | if (acc_mode == 0) | |
1110 | return 0; | |
1111 | if (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode)) | |
1112 | /* | |
1113 | * I don't check directories here because mkdir() and rmdir() | |
1114 | * don't call me. | |
1115 | */ | |
1116 | return 0; | |
fdb8ebb7 | 1117 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1118 | buf = tomoyo_get_path(path); |
1119 | if (!buf) | |
1120 | goto out; | |
1121 | error = 0; | |
1122 | /* | |
1123 | * If the filename is specified by "deny_rewrite" keyword, | |
1124 | * we need to check "allow_rewrite" permission when the filename is not | |
1125 | * opened for append mode or the filename is truncated at open time. | |
1126 | */ | |
1127 | if ((acc_mode & MAY_WRITE) && | |
1128 | ((flag & O_TRUNC) || !(flag & O_APPEND)) && | |
1129 | (tomoyo_is_no_rewrite_file(buf))) { | |
1130 | error = tomoyo_check_single_path_permission2(domain, | |
1131 | TOMOYO_TYPE_REWRITE_ACL, | |
1132 | buf, mode); | |
1133 | } | |
1134 | if (!error) | |
1135 | error = tomoyo_check_file_perm2(domain, buf, acc_mode, "open", | |
1136 | mode); | |
1137 | if (!error && (flag & O_TRUNC)) | |
1138 | error = tomoyo_check_single_path_permission2(domain, | |
1139 | TOMOYO_TYPE_TRUNCATE_ACL, | |
1140 | buf, mode); | |
1141 | out: | |
8e2d39a1 | 1142 | kfree(buf); |
fdb8ebb7 | 1143 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1144 | if (!is_enforce) |
1145 | error = 0; | |
1146 | return error; | |
1147 | } | |
1148 | ||
1149 | /** | |
937bf613 | 1150 | * tomoyo_check_1path_perm - Check permission for "create", "unlink", "mkdir", "rmdir", "mkfifo", "mksock", "mkblock", "mkchar", "truncate", "symlink", "ioctl", "chmod", "chown", "chgrp", "chroot", "mount" and "unmount". |
b69a54ee KT |
1151 | * |
1152 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1153 | * @operation: Type of operation. | |
1154 | * @path: Pointer to "struct path". | |
1155 | * | |
1156 | * Returns 0 on success, negative value otherwise. | |
1157 | */ | |
1158 | int tomoyo_check_1path_perm(struct tomoyo_domain_info *domain, | |
1159 | const u8 operation, struct path *path) | |
1160 | { | |
1161 | int error = -ENOMEM; | |
1162 | struct tomoyo_path_info *buf; | |
1163 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1164 | const bool is_enforce = (mode == 3); | |
fdb8ebb7 | 1165 | int idx; |
b69a54ee KT |
1166 | |
1167 | if (!mode || !path->mnt) | |
1168 | return 0; | |
fdb8ebb7 | 1169 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1170 | buf = tomoyo_get_path(path); |
1171 | if (!buf) | |
1172 | goto out; | |
1173 | switch (operation) { | |
1174 | case TOMOYO_TYPE_MKDIR_ACL: | |
1175 | case TOMOYO_TYPE_RMDIR_ACL: | |
937bf613 | 1176 | case TOMOYO_TYPE_CHROOT_ACL: |
b69a54ee KT |
1177 | if (!buf->is_dir) { |
1178 | /* | |
1179 | * tomoyo_get_path() reserves space for appending "/." | |
1180 | */ | |
1181 | strcat((char *) buf->name, "/"); | |
1182 | tomoyo_fill_path_info(buf); | |
1183 | } | |
1184 | } | |
1185 | error = tomoyo_check_single_path_permission2(domain, operation, buf, | |
1186 | mode); | |
1187 | out: | |
8e2d39a1 | 1188 | kfree(buf); |
fdb8ebb7 | 1189 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1190 | if (!is_enforce) |
1191 | error = 0; | |
1192 | return error; | |
1193 | } | |
1194 | ||
1195 | /** | |
1196 | * tomoyo_check_rewrite_permission - Check permission for "rewrite". | |
1197 | * | |
1198 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1199 | * @filp: Pointer to "struct file". | |
1200 | * | |
1201 | * Returns 0 on success, negative value otherwise. | |
1202 | */ | |
1203 | int tomoyo_check_rewrite_permission(struct tomoyo_domain_info *domain, | |
1204 | struct file *filp) | |
1205 | { | |
1206 | int error = -ENOMEM; | |
1207 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1208 | const bool is_enforce = (mode == 3); | |
1209 | struct tomoyo_path_info *buf; | |
fdb8ebb7 | 1210 | int idx; |
b69a54ee KT |
1211 | |
1212 | if (!mode || !filp->f_path.mnt) | |
1213 | return 0; | |
fdb8ebb7 TH |
1214 | |
1215 | idx = tomoyo_read_lock(); | |
b69a54ee KT |
1216 | buf = tomoyo_get_path(&filp->f_path); |
1217 | if (!buf) | |
1218 | goto out; | |
1219 | if (!tomoyo_is_no_rewrite_file(buf)) { | |
1220 | error = 0; | |
1221 | goto out; | |
1222 | } | |
1223 | error = tomoyo_check_single_path_permission2(domain, | |
1224 | TOMOYO_TYPE_REWRITE_ACL, | |
1225 | buf, mode); | |
1226 | out: | |
8e2d39a1 | 1227 | kfree(buf); |
fdb8ebb7 | 1228 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1229 | if (!is_enforce) |
1230 | error = 0; | |
1231 | return error; | |
1232 | } | |
1233 | ||
1234 | /** | |
937bf613 | 1235 | * tomoyo_check_2path_perm - Check permission for "rename", "link" and "pivot_root". |
b69a54ee KT |
1236 | * |
1237 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1238 | * @operation: Type of operation. | |
1239 | * @path1: Pointer to "struct path". | |
1240 | * @path2: Pointer to "struct path". | |
1241 | * | |
1242 | * Returns 0 on success, negative value otherwise. | |
1243 | */ | |
1244 | int tomoyo_check_2path_perm(struct tomoyo_domain_info * const domain, | |
1245 | const u8 operation, struct path *path1, | |
1246 | struct path *path2) | |
1247 | { | |
1248 | int error = -ENOMEM; | |
1249 | struct tomoyo_path_info *buf1, *buf2; | |
1250 | const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
1251 | const bool is_enforce = (mode == 3); | |
1252 | const char *msg; | |
fdb8ebb7 | 1253 | int idx; |
b69a54ee KT |
1254 | |
1255 | if (!mode || !path1->mnt || !path2->mnt) | |
1256 | return 0; | |
fdb8ebb7 | 1257 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1258 | buf1 = tomoyo_get_path(path1); |
1259 | buf2 = tomoyo_get_path(path2); | |
1260 | if (!buf1 || !buf2) | |
1261 | goto out; | |
1262 | { | |
1263 | struct dentry *dentry = path1->dentry; | |
1264 | if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) { | |
1265 | /* | |
1266 | * tomoyo_get_path() reserves space for appending "/." | |
1267 | */ | |
1268 | if (!buf1->is_dir) { | |
1269 | strcat((char *) buf1->name, "/"); | |
1270 | tomoyo_fill_path_info(buf1); | |
1271 | } | |
1272 | if (!buf2->is_dir) { | |
1273 | strcat((char *) buf2->name, "/"); | |
1274 | tomoyo_fill_path_info(buf2); | |
1275 | } | |
1276 | } | |
1277 | } | |
1278 | error = tomoyo_check_double_path_acl(domain, operation, buf1, buf2); | |
1279 | msg = tomoyo_dp2keyword(operation); | |
1280 | if (!error) | |
1281 | goto out; | |
1282 | if (tomoyo_verbose_mode(domain)) | |
1283 | printk(KERN_WARNING "TOMOYO-%s: Access '%s %s %s' " | |
1284 | "denied for %s\n", tomoyo_get_msg(is_enforce), | |
1285 | msg, buf1->name, buf2->name, | |
1286 | tomoyo_get_last_name(domain)); | |
1287 | if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { | |
1288 | const char *name1 = tomoyo_get_file_pattern(buf1)->name; | |
1289 | const char *name2 = tomoyo_get_file_pattern(buf2)->name; | |
1290 | tomoyo_update_double_path_acl(operation, name1, name2, domain, | |
1291 | false); | |
1292 | } | |
1293 | out: | |
8e2d39a1 TH |
1294 | kfree(buf1); |
1295 | kfree(buf2); | |
fdb8ebb7 | 1296 | tomoyo_read_unlock(idx); |
b69a54ee KT |
1297 | if (!is_enforce) |
1298 | error = 0; | |
1299 | return error; | |
1300 | } |