Commit | Line | Data |
---|---|---|
b69a54ee KT |
1 | /* |
2 | * security/tomoyo/file.c | |
3 | * | |
c3ef1500 | 4 | * Pathname restriction functions. |
b69a54ee | 5 | * |
c3ef1500 | 6 | * Copyright (C) 2005-2010 NTT DATA CORPORATION |
b69a54ee KT |
7 | */ |
8 | ||
9 | #include "common.h" | |
5a0e3ad6 | 10 | #include <linux/slab.h> |
b69a54ee | 11 | |
a1f9bb6a | 12 | /* Keyword array for operations with one pathname. */ |
7ef61233 TH |
13 | static const char *tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = { |
14 | [TOMOYO_TYPE_READ_WRITE] = "read/write", | |
15 | [TOMOYO_TYPE_EXECUTE] = "execute", | |
16 | [TOMOYO_TYPE_READ] = "read", | |
17 | [TOMOYO_TYPE_WRITE] = "write", | |
7ef61233 | 18 | [TOMOYO_TYPE_UNLINK] = "unlink", |
7ef61233 | 19 | [TOMOYO_TYPE_RMDIR] = "rmdir", |
7ef61233 TH |
20 | [TOMOYO_TYPE_TRUNCATE] = "truncate", |
21 | [TOMOYO_TYPE_SYMLINK] = "symlink", | |
22 | [TOMOYO_TYPE_REWRITE] = "rewrite", | |
7ef61233 | 23 | [TOMOYO_TYPE_CHROOT] = "chroot", |
7ef61233 | 24 | [TOMOYO_TYPE_UMOUNT] = "unmount", |
b69a54ee KT |
25 | }; |
26 | ||
a1f9bb6a TH |
27 | /* Keyword array for operations with one pathname and three numbers. */ |
28 | static const char *tomoyo_path_number3_keyword | |
29 | [TOMOYO_MAX_PATH_NUMBER3_OPERATION] = { | |
30 | [TOMOYO_TYPE_MKBLOCK] = "mkblock", | |
31 | [TOMOYO_TYPE_MKCHAR] = "mkchar", | |
32 | }; | |
33 | ||
34 | /* Keyword array for operations with two pathnames. */ | |
7ef61233 | 35 | static const char *tomoyo_path2_keyword[TOMOYO_MAX_PATH2_OPERATION] = { |
a1f9bb6a TH |
36 | [TOMOYO_TYPE_LINK] = "link", |
37 | [TOMOYO_TYPE_RENAME] = "rename", | |
7ef61233 | 38 | [TOMOYO_TYPE_PIVOT_ROOT] = "pivot_root", |
b69a54ee KT |
39 | }; |
40 | ||
a1f9bb6a TH |
41 | /* Keyword array for operations with one pathname and one number. */ |
42 | static const char *tomoyo_path_number_keyword | |
43 | [TOMOYO_MAX_PATH_NUMBER_OPERATION] = { | |
44 | [TOMOYO_TYPE_CREATE] = "create", | |
45 | [TOMOYO_TYPE_MKDIR] = "mkdir", | |
46 | [TOMOYO_TYPE_MKFIFO] = "mkfifo", | |
47 | [TOMOYO_TYPE_MKSOCK] = "mksock", | |
48 | [TOMOYO_TYPE_IOCTL] = "ioctl", | |
49 | [TOMOYO_TYPE_CHMOD] = "chmod", | |
50 | [TOMOYO_TYPE_CHOWN] = "chown", | |
51 | [TOMOYO_TYPE_CHGRP] = "chgrp", | |
52 | }; | |
53 | ||
7762fbff TH |
54 | void tomoyo_put_name_union(struct tomoyo_name_union *ptr) |
55 | { | |
56 | if (!ptr) | |
57 | return; | |
58 | if (ptr->is_group) | |
59 | tomoyo_put_path_group(ptr->group); | |
60 | else | |
61 | tomoyo_put_name(ptr->filename); | |
62 | } | |
63 | ||
64 | bool tomoyo_compare_name_union(const struct tomoyo_path_info *name, | |
65 | const struct tomoyo_name_union *ptr) | |
66 | { | |
67 | if (ptr->is_group) | |
3f629636 | 68 | return tomoyo_path_matches_group(name, ptr->group); |
7762fbff TH |
69 | return tomoyo_path_matches_pattern(name, ptr->filename); |
70 | } | |
71 | ||
4c3e9e2d TH |
72 | void tomoyo_put_number_union(struct tomoyo_number_union *ptr) |
73 | { | |
74 | if (ptr && ptr->is_group) | |
75 | tomoyo_put_number_group(ptr->group); | |
76 | } | |
77 | ||
78 | bool tomoyo_compare_number_union(const unsigned long value, | |
79 | const struct tomoyo_number_union *ptr) | |
80 | { | |
81 | if (ptr->is_group) | |
82 | return tomoyo_number_matches_group(value, value, ptr->group); | |
83 | return value >= ptr->values[0] && value <= ptr->values[1]; | |
84 | } | |
85 | ||
b69a54ee | 86 | /** |
7ef61233 | 87 | * tomoyo_path2keyword - Get the name of single path operation. |
b69a54ee KT |
88 | * |
89 | * @operation: Type of operation. | |
90 | * | |
91 | * Returns the name of single path operation. | |
92 | */ | |
7ef61233 | 93 | const char *tomoyo_path2keyword(const u8 operation) |
b69a54ee | 94 | { |
7ef61233 TH |
95 | return (operation < TOMOYO_MAX_PATH_OPERATION) |
96 | ? tomoyo_path_keyword[operation] : NULL; | |
b69a54ee KT |
97 | } |
98 | ||
a1f9bb6a TH |
99 | /** |
100 | * tomoyo_path_number32keyword - Get the name of path/number/number/number operations. | |
101 | * | |
102 | * @operation: Type of operation. | |
103 | * | |
104 | * Returns the name of path/number/number/number operation. | |
105 | */ | |
106 | const char *tomoyo_path_number32keyword(const u8 operation) | |
107 | { | |
108 | return (operation < TOMOYO_MAX_PATH_NUMBER3_OPERATION) | |
109 | ? tomoyo_path_number3_keyword[operation] : NULL; | |
110 | } | |
111 | ||
b69a54ee | 112 | /** |
7ef61233 | 113 | * tomoyo_path22keyword - Get the name of double path operation. |
b69a54ee KT |
114 | * |
115 | * @operation: Type of operation. | |
116 | * | |
117 | * Returns the name of double path operation. | |
118 | */ | |
7ef61233 | 119 | const char *tomoyo_path22keyword(const u8 operation) |
b69a54ee | 120 | { |
7ef61233 TH |
121 | return (operation < TOMOYO_MAX_PATH2_OPERATION) |
122 | ? tomoyo_path2_keyword[operation] : NULL; | |
b69a54ee KT |
123 | } |
124 | ||
a1f9bb6a TH |
125 | /** |
126 | * tomoyo_path_number2keyword - Get the name of path/number operations. | |
127 | * | |
128 | * @operation: Type of operation. | |
129 | * | |
130 | * Returns the name of path/number operation. | |
131 | */ | |
132 | const char *tomoyo_path_number2keyword(const u8 operation) | |
133 | { | |
134 | return (operation < TOMOYO_MAX_PATH_NUMBER_OPERATION) | |
135 | ? tomoyo_path_number_keyword[operation] : NULL; | |
136 | } | |
137 | ||
c8c57e84 TH |
138 | static void tomoyo_add_slash(struct tomoyo_path_info *buf) |
139 | { | |
140 | if (buf->is_dir) | |
141 | return; | |
142 | /* | |
143 | * This is OK because tomoyo_encode() reserves space for appending "/". | |
144 | */ | |
145 | strcat((char *) buf->name, "/"); | |
146 | tomoyo_fill_path_info(buf); | |
147 | } | |
148 | ||
b69a54ee KT |
149 | /** |
150 | * tomoyo_strendswith - Check whether the token ends with the given token. | |
151 | * | |
152 | * @name: The token to check. | |
153 | * @tail: The token to find. | |
154 | * | |
155 | * Returns true if @name ends with @tail, false otherwise. | |
156 | */ | |
157 | static bool tomoyo_strendswith(const char *name, const char *tail) | |
158 | { | |
159 | int len; | |
160 | ||
161 | if (!name || !tail) | |
162 | return false; | |
163 | len = strlen(name) - strlen(tail); | |
164 | return len >= 0 && !strcmp(name + len, tail); | |
165 | } | |
166 | ||
167 | /** | |
c8c57e84 | 168 | * tomoyo_get_realpath - Get realpath. |
b69a54ee | 169 | * |
c8c57e84 | 170 | * @buf: Pointer to "struct tomoyo_path_info". |
b69a54ee KT |
171 | * @path: Pointer to "struct path". |
172 | * | |
c8c57e84 | 173 | * Returns true on success, false otherwise. |
b69a54ee | 174 | */ |
c8c57e84 | 175 | static bool tomoyo_get_realpath(struct tomoyo_path_info *buf, struct path *path) |
b69a54ee | 176 | { |
c8c57e84 TH |
177 | buf->name = tomoyo_realpath_from_path(path); |
178 | if (buf->name) { | |
179 | tomoyo_fill_path_info(buf); | |
180 | return true; | |
b69a54ee | 181 | } |
c8c57e84 | 182 | return false; |
b69a54ee KT |
183 | } |
184 | ||
7ef61233 TH |
185 | static int tomoyo_update_path2_acl(const u8 type, const char *filename1, |
186 | const char *filename2, | |
187 | struct tomoyo_domain_info *const domain, | |
188 | const bool is_delete); | |
189 | static int tomoyo_update_path_acl(const u8 type, const char *filename, | |
190 | struct tomoyo_domain_info *const domain, | |
191 | const bool is_delete); | |
b69a54ee | 192 | |
c3fa109a TH |
193 | /* |
194 | * tomoyo_globally_readable_list is used for holding list of pathnames which | |
195 | * are by default allowed to be open()ed for reading by any process. | |
196 | * | |
197 | * An entry is added by | |
198 | * | |
199 | * # echo 'allow_read /lib/libc-2.5.so' > \ | |
200 | * /sys/kernel/security/tomoyo/exception_policy | |
201 | * | |
202 | * and is deleted by | |
203 | * | |
204 | * # echo 'delete allow_read /lib/libc-2.5.so' > \ | |
205 | * /sys/kernel/security/tomoyo/exception_policy | |
206 | * | |
207 | * and all entries are retrieved by | |
208 | * | |
209 | * # grep ^allow_read /sys/kernel/security/tomoyo/exception_policy | |
210 | * | |
211 | * In the example above, any process is allowed to | |
212 | * open("/lib/libc-2.5.so", O_RDONLY). | |
213 | * One exception is, if the domain which current process belongs to is marked | |
214 | * as "ignore_global_allow_read", current process can't do so unless explicitly | |
215 | * given "allow_read /lib/libc-2.5.so" to the domain which current process | |
216 | * belongs to. | |
217 | */ | |
847b173e | 218 | LIST_HEAD(tomoyo_globally_readable_list); |
b69a54ee KT |
219 | |
220 | /** | |
221 | * tomoyo_update_globally_readable_entry - Update "struct tomoyo_globally_readable_file_entry" list. | |
222 | * | |
223 | * @filename: Filename unconditionally permitted to open() for reading. | |
224 | * @is_delete: True if it is a delete request. | |
225 | * | |
226 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
227 | * |
228 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
229 | */ |
230 | static int tomoyo_update_globally_readable_entry(const char *filename, | |
231 | const bool is_delete) | |
232 | { | |
b69a54ee | 233 | struct tomoyo_globally_readable_file_entry *ptr; |
9e4b50e9 | 234 | struct tomoyo_globally_readable_file_entry e = { }; |
ca0b7df3 | 235 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 236 | |
3f629636 | 237 | if (!tomoyo_is_correct_word(filename)) |
b69a54ee | 238 | return -EINVAL; |
9e4b50e9 TH |
239 | e.filename = tomoyo_get_name(filename); |
240 | if (!e.filename) | |
b69a54ee | 241 | return -ENOMEM; |
29282381 TH |
242 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
243 | goto out; | |
fdb8ebb7 | 244 | list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { |
9e4b50e9 | 245 | if (ptr->filename != e.filename) |
b69a54ee KT |
246 | continue; |
247 | ptr->is_deleted = is_delete; | |
248 | error = 0; | |
ca0b7df3 | 249 | break; |
b69a54ee | 250 | } |
9e4b50e9 TH |
251 | if (!is_delete && error) { |
252 | struct tomoyo_globally_readable_file_entry *entry = | |
253 | tomoyo_commit_ok(&e, sizeof(e)); | |
254 | if (entry) { | |
255 | list_add_tail_rcu(&entry->list, | |
256 | &tomoyo_globally_readable_list); | |
257 | error = 0; | |
258 | } | |
b69a54ee | 259 | } |
f737d95d | 260 | mutex_unlock(&tomoyo_policy_lock); |
29282381 | 261 | out: |
9e4b50e9 | 262 | tomoyo_put_name(e.filename); |
b69a54ee KT |
263 | return error; |
264 | } | |
265 | ||
266 | /** | |
267 | * tomoyo_is_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading. | |
268 | * | |
269 | * @filename: The filename to check. | |
270 | * | |
271 | * Returns true if any domain can open @filename for reading, false otherwise. | |
fdb8ebb7 TH |
272 | * |
273 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
274 | */ |
275 | static bool tomoyo_is_globally_readable_file(const struct tomoyo_path_info * | |
276 | filename) | |
277 | { | |
278 | struct tomoyo_globally_readable_file_entry *ptr; | |
279 | bool found = false; | |
fdb8ebb7 TH |
280 | |
281 | list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { | |
b69a54ee KT |
282 | if (!ptr->is_deleted && |
283 | tomoyo_path_matches_pattern(filename, ptr->filename)) { | |
284 | found = true; | |
285 | break; | |
286 | } | |
287 | } | |
b69a54ee KT |
288 | return found; |
289 | } | |
290 | ||
291 | /** | |
292 | * tomoyo_write_globally_readable_policy - Write "struct tomoyo_globally_readable_file_entry" list. | |
293 | * | |
294 | * @data: String to parse. | |
295 | * @is_delete: True if it is a delete request. | |
296 | * | |
297 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
298 | * |
299 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
300 | */ |
301 | int tomoyo_write_globally_readable_policy(char *data, const bool is_delete) | |
302 | { | |
303 | return tomoyo_update_globally_readable_entry(data, is_delete); | |
304 | } | |
305 | ||
306 | /** | |
307 | * tomoyo_read_globally_readable_policy - Read "struct tomoyo_globally_readable_file_entry" list. | |
308 | * | |
309 | * @head: Pointer to "struct tomoyo_io_buffer". | |
310 | * | |
311 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
312 | * |
313 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
314 | */ |
315 | bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head) | |
316 | { | |
317 | struct list_head *pos; | |
318 | bool done = true; | |
319 | ||
b69a54ee KT |
320 | list_for_each_cookie(pos, head->read_var2, |
321 | &tomoyo_globally_readable_list) { | |
322 | struct tomoyo_globally_readable_file_entry *ptr; | |
323 | ptr = list_entry(pos, | |
324 | struct tomoyo_globally_readable_file_entry, | |
325 | list); | |
326 | if (ptr->is_deleted) | |
327 | continue; | |
7d2948b1 TH |
328 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_READ "%s\n", |
329 | ptr->filename->name); | |
330 | if (!done) | |
b69a54ee | 331 | break; |
b69a54ee | 332 | } |
b69a54ee KT |
333 | return done; |
334 | } | |
335 | ||
c3fa109a TH |
336 | /* tomoyo_pattern_list is used for holding list of pathnames which are used for |
337 | * converting pathnames to pathname patterns during learning mode. | |
338 | * | |
339 | * An entry is added by | |
340 | * | |
341 | * # echo 'file_pattern /proc/\$/mounts' > \ | |
342 | * /sys/kernel/security/tomoyo/exception_policy | |
343 | * | |
344 | * and is deleted by | |
345 | * | |
346 | * # echo 'delete file_pattern /proc/\$/mounts' > \ | |
347 | * /sys/kernel/security/tomoyo/exception_policy | |
348 | * | |
349 | * and all entries are retrieved by | |
350 | * | |
351 | * # grep ^file_pattern /sys/kernel/security/tomoyo/exception_policy | |
352 | * | |
353 | * In the example above, if a process which belongs to a domain which is in | |
354 | * learning mode requested open("/proc/1/mounts", O_RDONLY), | |
355 | * "allow_read /proc/\$/mounts" is automatically added to the domain which that | |
356 | * process belongs to. | |
357 | * | |
358 | * It is not a desirable behavior that we have to use /proc/\$/ instead of | |
359 | * /proc/self/ when current process needs to access only current process's | |
360 | * information. As of now, LSM version of TOMOYO is using __d_path() for | |
361 | * calculating pathname. Non LSM version of TOMOYO is using its own function | |
362 | * which pretends as if /proc/self/ is not a symlink; so that we can forbid | |
363 | * current process from accessing other process's information. | |
364 | */ | |
847b173e | 365 | LIST_HEAD(tomoyo_pattern_list); |
b69a54ee KT |
366 | |
367 | /** | |
368 | * tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list. | |
369 | * | |
370 | * @pattern: Pathname pattern. | |
371 | * @is_delete: True if it is a delete request. | |
372 | * | |
373 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
374 | * |
375 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
376 | */ |
377 | static int tomoyo_update_file_pattern_entry(const char *pattern, | |
378 | const bool is_delete) | |
379 | { | |
b69a54ee | 380 | struct tomoyo_pattern_entry *ptr; |
3f629636 | 381 | struct tomoyo_pattern_entry e = { }; |
ca0b7df3 | 382 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 383 | |
3f629636 TH |
384 | if (!tomoyo_is_correct_word(pattern)) |
385 | return -EINVAL; | |
386 | e.pattern = tomoyo_get_name(pattern); | |
9e4b50e9 | 387 | if (!e.pattern) |
ca0b7df3 | 388 | return error; |
29282381 TH |
389 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
390 | goto out; | |
fdb8ebb7 | 391 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { |
9e4b50e9 | 392 | if (e.pattern != ptr->pattern) |
b69a54ee KT |
393 | continue; |
394 | ptr->is_deleted = is_delete; | |
395 | error = 0; | |
ca0b7df3 | 396 | break; |
b69a54ee | 397 | } |
9e4b50e9 TH |
398 | if (!is_delete && error) { |
399 | struct tomoyo_pattern_entry *entry = | |
400 | tomoyo_commit_ok(&e, sizeof(e)); | |
401 | if (entry) { | |
402 | list_add_tail_rcu(&entry->list, &tomoyo_pattern_list); | |
403 | error = 0; | |
404 | } | |
b69a54ee | 405 | } |
f737d95d | 406 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 407 | out: |
9e4b50e9 | 408 | tomoyo_put_name(e.pattern); |
b69a54ee KT |
409 | return error; |
410 | } | |
411 | ||
412 | /** | |
17fcfbd9 | 413 | * tomoyo_file_pattern - Get patterned pathname. |
b69a54ee KT |
414 | * |
415 | * @filename: The filename to find patterned pathname. | |
416 | * | |
417 | * Returns pointer to pathname pattern if matched, @filename otherwise. | |
fdb8ebb7 TH |
418 | * |
419 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 420 | */ |
17fcfbd9 | 421 | const char *tomoyo_file_pattern(const struct tomoyo_path_info *filename) |
b69a54ee KT |
422 | { |
423 | struct tomoyo_pattern_entry *ptr; | |
424 | const struct tomoyo_path_info *pattern = NULL; | |
425 | ||
fdb8ebb7 | 426 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { |
b69a54ee KT |
427 | if (ptr->is_deleted) |
428 | continue; | |
429 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
430 | continue; | |
431 | pattern = ptr->pattern; | |
432 | if (tomoyo_strendswith(pattern->name, "/\\*")) { | |
433 | /* Do nothing. Try to find the better match. */ | |
434 | } else { | |
435 | /* This would be the better match. Use this. */ | |
436 | break; | |
437 | } | |
438 | } | |
b69a54ee KT |
439 | if (pattern) |
440 | filename = pattern; | |
17fcfbd9 | 441 | return filename->name; |
b69a54ee KT |
442 | } |
443 | ||
444 | /** | |
445 | * tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list. | |
446 | * | |
447 | * @data: String to parse. | |
448 | * @is_delete: True if it is a delete request. | |
449 | * | |
450 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
451 | * |
452 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
453 | */ |
454 | int tomoyo_write_pattern_policy(char *data, const bool is_delete) | |
455 | { | |
456 | return tomoyo_update_file_pattern_entry(data, is_delete); | |
457 | } | |
458 | ||
459 | /** | |
460 | * tomoyo_read_file_pattern - Read "struct tomoyo_pattern_entry" list. | |
461 | * | |
462 | * @head: Pointer to "struct tomoyo_io_buffer". | |
463 | * | |
464 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
465 | * |
466 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
467 | */ |
468 | bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head) | |
469 | { | |
470 | struct list_head *pos; | |
471 | bool done = true; | |
472 | ||
b69a54ee KT |
473 | list_for_each_cookie(pos, head->read_var2, &tomoyo_pattern_list) { |
474 | struct tomoyo_pattern_entry *ptr; | |
475 | ptr = list_entry(pos, struct tomoyo_pattern_entry, list); | |
476 | if (ptr->is_deleted) | |
477 | continue; | |
7d2948b1 TH |
478 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_FILE_PATTERN |
479 | "%s\n", ptr->pattern->name); | |
480 | if (!done) | |
b69a54ee | 481 | break; |
b69a54ee | 482 | } |
b69a54ee KT |
483 | return done; |
484 | } | |
485 | ||
c3fa109a TH |
486 | /* |
487 | * tomoyo_no_rewrite_list is used for holding list of pathnames which are by | |
488 | * default forbidden to modify already written content of a file. | |
489 | * | |
490 | * An entry is added by | |
491 | * | |
492 | * # echo 'deny_rewrite /var/log/messages' > \ | |
493 | * /sys/kernel/security/tomoyo/exception_policy | |
494 | * | |
495 | * and is deleted by | |
496 | * | |
497 | * # echo 'delete deny_rewrite /var/log/messages' > \ | |
498 | * /sys/kernel/security/tomoyo/exception_policy | |
499 | * | |
500 | * and all entries are retrieved by | |
501 | * | |
502 | * # grep ^deny_rewrite /sys/kernel/security/tomoyo/exception_policy | |
503 | * | |
504 | * In the example above, if a process requested to rewrite /var/log/messages , | |
505 | * the process can't rewrite unless the domain which that process belongs to | |
506 | * has "allow_rewrite /var/log/messages" entry. | |
507 | * | |
508 | * It is not a desirable behavior that we have to add "\040(deleted)" suffix | |
509 | * when we want to allow rewriting already unlink()ed file. As of now, | |
510 | * LSM version of TOMOYO is using __d_path() for calculating pathname. | |
511 | * Non LSM version of TOMOYO is using its own function which doesn't append | |
512 | * " (deleted)" suffix if the file is already unlink()ed; so that we don't | |
513 | * need to worry whether the file is already unlink()ed or not. | |
514 | */ | |
847b173e | 515 | LIST_HEAD(tomoyo_no_rewrite_list); |
b69a54ee KT |
516 | |
517 | /** | |
518 | * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list. | |
519 | * | |
520 | * @pattern: Pathname pattern that are not rewritable by default. | |
521 | * @is_delete: True if it is a delete request. | |
522 | * | |
523 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
524 | * |
525 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
526 | */ |
527 | static int tomoyo_update_no_rewrite_entry(const char *pattern, | |
528 | const bool is_delete) | |
529 | { | |
ca0b7df3 | 530 | struct tomoyo_no_rewrite_entry *ptr; |
9e4b50e9 | 531 | struct tomoyo_no_rewrite_entry e = { }; |
ca0b7df3 | 532 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 533 | |
3f629636 | 534 | if (!tomoyo_is_correct_word(pattern)) |
b69a54ee | 535 | return -EINVAL; |
9e4b50e9 TH |
536 | e.pattern = tomoyo_get_name(pattern); |
537 | if (!e.pattern) | |
ca0b7df3 | 538 | return error; |
29282381 TH |
539 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
540 | goto out; | |
fdb8ebb7 | 541 | list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { |
9e4b50e9 | 542 | if (ptr->pattern != e.pattern) |
b69a54ee KT |
543 | continue; |
544 | ptr->is_deleted = is_delete; | |
545 | error = 0; | |
ca0b7df3 | 546 | break; |
b69a54ee | 547 | } |
9e4b50e9 TH |
548 | if (!is_delete && error) { |
549 | struct tomoyo_no_rewrite_entry *entry = | |
550 | tomoyo_commit_ok(&e, sizeof(e)); | |
551 | if (entry) { | |
552 | list_add_tail_rcu(&entry->list, | |
553 | &tomoyo_no_rewrite_list); | |
554 | error = 0; | |
555 | } | |
b69a54ee | 556 | } |
f737d95d | 557 | mutex_unlock(&tomoyo_policy_lock); |
29282381 | 558 | out: |
9e4b50e9 | 559 | tomoyo_put_name(e.pattern); |
b69a54ee KT |
560 | return error; |
561 | } | |
562 | ||
563 | /** | |
564 | * tomoyo_is_no_rewrite_file - Check if the given pathname is not permitted to be rewrited. | |
565 | * | |
566 | * @filename: Filename to check. | |
567 | * | |
568 | * Returns true if @filename is specified by "deny_rewrite" directive, | |
569 | * false otherwise. | |
fdb8ebb7 TH |
570 | * |
571 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
572 | */ |
573 | static bool tomoyo_is_no_rewrite_file(const struct tomoyo_path_info *filename) | |
574 | { | |
575 | struct tomoyo_no_rewrite_entry *ptr; | |
576 | bool found = false; | |
577 | ||
fdb8ebb7 | 578 | list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { |
b69a54ee KT |
579 | if (ptr->is_deleted) |
580 | continue; | |
581 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
582 | continue; | |
583 | found = true; | |
584 | break; | |
585 | } | |
b69a54ee KT |
586 | return found; |
587 | } | |
588 | ||
589 | /** | |
590 | * tomoyo_write_no_rewrite_policy - Write "struct tomoyo_no_rewrite_entry" list. | |
591 | * | |
592 | * @data: String to parse. | |
593 | * @is_delete: True if it is a delete request. | |
594 | * | |
595 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
596 | * |
597 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
598 | */ |
599 | int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete) | |
600 | { | |
601 | return tomoyo_update_no_rewrite_entry(data, is_delete); | |
602 | } | |
603 | ||
604 | /** | |
605 | * tomoyo_read_no_rewrite_policy - Read "struct tomoyo_no_rewrite_entry" list. | |
606 | * | |
607 | * @head: Pointer to "struct tomoyo_io_buffer". | |
608 | * | |
609 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
610 | * |
611 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
612 | */ |
613 | bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head) | |
614 | { | |
615 | struct list_head *pos; | |
616 | bool done = true; | |
617 | ||
b69a54ee KT |
618 | list_for_each_cookie(pos, head->read_var2, &tomoyo_no_rewrite_list) { |
619 | struct tomoyo_no_rewrite_entry *ptr; | |
620 | ptr = list_entry(pos, struct tomoyo_no_rewrite_entry, list); | |
621 | if (ptr->is_deleted) | |
622 | continue; | |
7d2948b1 TH |
623 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_DENY_REWRITE |
624 | "%s\n", ptr->pattern->name); | |
625 | if (!done) | |
b69a54ee | 626 | break; |
b69a54ee | 627 | } |
b69a54ee KT |
628 | return done; |
629 | } | |
630 | ||
631 | /** | |
632 | * tomoyo_update_file_acl - Update file's read/write/execute ACL. | |
633 | * | |
b69a54ee | 634 | * @perm: Permission (between 1 to 7). |
a1f9bb6a | 635 | * @filename: Filename. |
b69a54ee KT |
636 | * @domain: Pointer to "struct tomoyo_domain_info". |
637 | * @is_delete: True if it is a delete request. | |
638 | * | |
639 | * Returns 0 on success, negative value otherwise. | |
640 | * | |
641 | * This is legacy support interface for older policy syntax. | |
642 | * Current policy syntax uses "allow_read/write" instead of "6", | |
643 | * "allow_read" instead of "4", "allow_write" instead of "2", | |
644 | * "allow_execute" instead of "1". | |
fdb8ebb7 TH |
645 | * |
646 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 647 | */ |
a1f9bb6a | 648 | static int tomoyo_update_file_acl(u8 perm, const char *filename, |
b69a54ee KT |
649 | struct tomoyo_domain_info * const domain, |
650 | const bool is_delete) | |
651 | { | |
652 | if (perm > 7 || !perm) { | |
653 | printk(KERN_DEBUG "%s: Invalid permission '%d %s'\n", | |
654 | __func__, perm, filename); | |
655 | return -EINVAL; | |
656 | } | |
657 | if (filename[0] != '@' && tomoyo_strendswith(filename, "/")) | |
658 | /* | |
659 | * Only 'allow_mkdir' and 'allow_rmdir' are valid for | |
660 | * directory permissions. | |
661 | */ | |
662 | return 0; | |
663 | if (perm & 4) | |
7ef61233 TH |
664 | tomoyo_update_path_acl(TOMOYO_TYPE_READ, filename, domain, |
665 | is_delete); | |
b69a54ee | 666 | if (perm & 2) |
7ef61233 TH |
667 | tomoyo_update_path_acl(TOMOYO_TYPE_WRITE, filename, domain, |
668 | is_delete); | |
b69a54ee | 669 | if (perm & 1) |
7ef61233 TH |
670 | tomoyo_update_path_acl(TOMOYO_TYPE_EXECUTE, filename, domain, |
671 | is_delete); | |
b69a54ee KT |
672 | return 0; |
673 | } | |
674 | ||
675 | /** | |
cb0abe6a | 676 | * tomoyo_path_acl - Check permission for single path operation. |
b69a54ee | 677 | * |
cb0abe6a | 678 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee KT |
679 | * @filename: Filename to check. |
680 | * @perm: Permission. | |
b69a54ee KT |
681 | * |
682 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
683 | * |
684 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 685 | */ |
cb0abe6a TH |
686 | static int tomoyo_path_acl(const struct tomoyo_request_info *r, |
687 | const struct tomoyo_path_info *filename, | |
3f629636 | 688 | const u32 perm) |
b69a54ee | 689 | { |
cb0abe6a | 690 | struct tomoyo_domain_info *domain = r->domain; |
b69a54ee KT |
691 | struct tomoyo_acl_info *ptr; |
692 | int error = -EPERM; | |
693 | ||
fdb8ebb7 | 694 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
695 | struct tomoyo_path_acl *acl; |
696 | if (ptr->type != TOMOYO_TYPE_PATH_ACL) | |
b69a54ee | 697 | continue; |
7ef61233 | 698 | acl = container_of(ptr, struct tomoyo_path_acl, head); |
a1f9bb6a | 699 | if (!(acl->perm & perm) || |
3f629636 | 700 | !tomoyo_compare_name_union(filename, &acl->name)) |
b69a54ee | 701 | continue; |
b69a54ee KT |
702 | error = 0; |
703 | break; | |
704 | } | |
b69a54ee KT |
705 | return error; |
706 | } | |
707 | ||
708 | /** | |
cb0abe6a | 709 | * tomoyo_file_perm - Check permission for opening files. |
b69a54ee | 710 | * |
cb0abe6a | 711 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee | 712 | * @filename: Filename to check. |
cb0abe6a | 713 | * @mode: Mode ("read" or "write" or "read/write" or "execute"). |
b69a54ee KT |
714 | * |
715 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
716 | * |
717 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 718 | */ |
cb0abe6a TH |
719 | static int tomoyo_file_perm(struct tomoyo_request_info *r, |
720 | const struct tomoyo_path_info *filename, | |
721 | const u8 mode) | |
b69a54ee | 722 | { |
b69a54ee KT |
723 | const char *msg = "<unknown>"; |
724 | int error = 0; | |
cb0abe6a | 725 | u32 perm = 0; |
b69a54ee KT |
726 | |
727 | if (!filename) | |
728 | return 0; | |
cb0abe6a TH |
729 | |
730 | if (mode == 6) { | |
7ef61233 | 731 | msg = tomoyo_path2keyword(TOMOYO_TYPE_READ_WRITE); |
cb0abe6a TH |
732 | perm = 1 << TOMOYO_TYPE_READ_WRITE; |
733 | } else if (mode == 4) { | |
7ef61233 | 734 | msg = tomoyo_path2keyword(TOMOYO_TYPE_READ); |
cb0abe6a TH |
735 | perm = 1 << TOMOYO_TYPE_READ; |
736 | } else if (mode == 2) { | |
7ef61233 | 737 | msg = tomoyo_path2keyword(TOMOYO_TYPE_WRITE); |
cb0abe6a TH |
738 | perm = 1 << TOMOYO_TYPE_WRITE; |
739 | } else if (mode == 1) { | |
7ef61233 | 740 | msg = tomoyo_path2keyword(TOMOYO_TYPE_EXECUTE); |
cb0abe6a TH |
741 | perm = 1 << TOMOYO_TYPE_EXECUTE; |
742 | } else | |
b69a54ee | 743 | BUG(); |
17fcfbd9 | 744 | do { |
3f629636 | 745 | error = tomoyo_path_acl(r, filename, perm); |
17fcfbd9 TH |
746 | if (error && mode == 4 && !r->domain->ignore_global_allow_read |
747 | && tomoyo_is_globally_readable_file(filename)) | |
748 | error = 0; | |
749 | if (!error) | |
750 | break; | |
751 | tomoyo_warn_log(r, "%s %s", msg, filename->name); | |
752 | error = tomoyo_supervisor(r, "allow_%s %s\n", msg, | |
17fcfbd9 TH |
753 | tomoyo_file_pattern(filename)); |
754 | /* | |
755 | * Do not retry for execute request, for alias may have | |
756 | * changed. | |
757 | */ | |
758 | } while (error == TOMOYO_RETRY_REQUEST && mode != 1); | |
759 | if (r->mode != TOMOYO_CONFIG_ENFORCING) | |
cb0abe6a | 760 | error = 0; |
17fcfbd9 | 761 | return error; |
b69a54ee KT |
762 | } |
763 | ||
b69a54ee | 764 | /** |
7ef61233 | 765 | * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list. |
b69a54ee KT |
766 | * |
767 | * @type: Type of operation. | |
768 | * @filename: Filename. | |
769 | * @domain: Pointer to "struct tomoyo_domain_info". | |
770 | * @is_delete: True if it is a delete request. | |
771 | * | |
772 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
773 | * |
774 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 775 | */ |
7ef61233 TH |
776 | static int tomoyo_update_path_acl(const u8 type, const char *filename, |
777 | struct tomoyo_domain_info *const domain, | |
778 | const bool is_delete) | |
b69a54ee | 779 | { |
a1f9bb6a | 780 | static const u16 tomoyo_rw_mask = |
7ef61233 | 781 | (1 << TOMOYO_TYPE_READ) | (1 << TOMOYO_TYPE_WRITE); |
a1f9bb6a | 782 | const u16 perm = 1 << type; |
b69a54ee | 783 | struct tomoyo_acl_info *ptr; |
9e4b50e9 TH |
784 | struct tomoyo_path_acl e = { |
785 | .head.type = TOMOYO_TYPE_PATH_ACL, | |
9e4b50e9 TH |
786 | .perm = perm |
787 | }; | |
ca0b7df3 | 788 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 789 | |
9e4b50e9 TH |
790 | if (type == TOMOYO_TYPE_READ_WRITE) |
791 | e.perm |= tomoyo_rw_mask; | |
b69a54ee KT |
792 | if (!domain) |
793 | return -EINVAL; | |
7762fbff | 794 | if (!tomoyo_parse_name_union(filename, &e.name)) |
b69a54ee | 795 | return -EINVAL; |
29282381 TH |
796 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
797 | goto out; | |
fdb8ebb7 | 798 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
799 | struct tomoyo_path_acl *acl = |
800 | container_of(ptr, struct tomoyo_path_acl, head); | |
7762fbff | 801 | if (!tomoyo_is_same_path_acl(acl, &e)) |
b69a54ee | 802 | continue; |
ca0b7df3 | 803 | if (is_delete) { |
a1f9bb6a | 804 | acl->perm &= ~perm; |
9e4b50e9 | 805 | if ((acl->perm & tomoyo_rw_mask) != tomoyo_rw_mask) |
7ef61233 TH |
806 | acl->perm &= ~(1 << TOMOYO_TYPE_READ_WRITE); |
807 | else if (!(acl->perm & (1 << TOMOYO_TYPE_READ_WRITE))) | |
9e4b50e9 | 808 | acl->perm &= ~tomoyo_rw_mask; |
ca0b7df3 | 809 | } else { |
a1f9bb6a | 810 | acl->perm |= perm; |
9e4b50e9 | 811 | if ((acl->perm & tomoyo_rw_mask) == tomoyo_rw_mask) |
7ef61233 TH |
812 | acl->perm |= 1 << TOMOYO_TYPE_READ_WRITE; |
813 | else if (acl->perm & (1 << TOMOYO_TYPE_READ_WRITE)) | |
9e4b50e9 | 814 | acl->perm |= tomoyo_rw_mask; |
ca0b7df3 | 815 | } |
b69a54ee | 816 | error = 0; |
ca0b7df3 | 817 | break; |
cd7bec6a | 818 | } |
9e4b50e9 TH |
819 | if (!is_delete && error) { |
820 | struct tomoyo_path_acl *entry = | |
821 | tomoyo_commit_ok(&e, sizeof(e)); | |
822 | if (entry) { | |
823 | list_add_tail_rcu(&entry->head.list, | |
824 | &domain->acl_info_list); | |
825 | error = 0; | |
826 | } | |
b69a54ee | 827 | } |
f737d95d | 828 | mutex_unlock(&tomoyo_policy_lock); |
29282381 | 829 | out: |
7762fbff | 830 | tomoyo_put_name_union(&e.name); |
b69a54ee KT |
831 | return error; |
832 | } | |
833 | ||
a1f9bb6a TH |
834 | /** |
835 | * tomoyo_update_path_number3_acl - Update "struct tomoyo_path_number3_acl" list. | |
836 | * | |
837 | * @type: Type of operation. | |
838 | * @filename: Filename. | |
839 | * @mode: Create mode. | |
840 | * @major: Device major number. | |
841 | * @minor: Device minor number. | |
842 | * @domain: Pointer to "struct tomoyo_domain_info". | |
843 | * @is_delete: True if it is a delete request. | |
844 | * | |
845 | * Returns 0 on success, negative value otherwise. | |
846 | */ | |
847 | static inline int tomoyo_update_path_number3_acl(const u8 type, | |
848 | const char *filename, | |
849 | char *mode, | |
850 | char *major, char *minor, | |
851 | struct tomoyo_domain_info * | |
852 | const domain, | |
853 | const bool is_delete) | |
854 | { | |
855 | const u8 perm = 1 << type; | |
856 | struct tomoyo_acl_info *ptr; | |
857 | struct tomoyo_path_number3_acl e = { | |
858 | .head.type = TOMOYO_TYPE_PATH_NUMBER3_ACL, | |
859 | .perm = perm | |
860 | }; | |
861 | int error = is_delete ? -ENOENT : -ENOMEM; | |
862 | if (!tomoyo_parse_name_union(filename, &e.name) || | |
863 | !tomoyo_parse_number_union(mode, &e.mode) || | |
864 | !tomoyo_parse_number_union(major, &e.major) || | |
865 | !tomoyo_parse_number_union(minor, &e.minor)) | |
866 | goto out; | |
867 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
868 | goto out; | |
869 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { | |
870 | struct tomoyo_path_number3_acl *acl = | |
871 | container_of(ptr, struct tomoyo_path_number3_acl, head); | |
872 | if (!tomoyo_is_same_path_number3_acl(acl, &e)) | |
873 | continue; | |
874 | if (is_delete) | |
875 | acl->perm &= ~perm; | |
876 | else | |
877 | acl->perm |= perm; | |
878 | error = 0; | |
879 | break; | |
880 | } | |
881 | if (!is_delete && error) { | |
882 | struct tomoyo_path_number3_acl *entry = | |
883 | tomoyo_commit_ok(&e, sizeof(e)); | |
884 | if (entry) { | |
885 | list_add_tail_rcu(&entry->head.list, | |
886 | &domain->acl_info_list); | |
887 | error = 0; | |
888 | } | |
889 | } | |
890 | mutex_unlock(&tomoyo_policy_lock); | |
891 | out: | |
892 | tomoyo_put_name_union(&e.name); | |
893 | tomoyo_put_number_union(&e.mode); | |
894 | tomoyo_put_number_union(&e.major); | |
895 | tomoyo_put_number_union(&e.minor); | |
896 | return error; | |
897 | } | |
898 | ||
b69a54ee | 899 | /** |
7ef61233 | 900 | * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list. |
b69a54ee KT |
901 | * |
902 | * @type: Type of operation. | |
903 | * @filename1: First filename. | |
904 | * @filename2: Second filename. | |
905 | * @domain: Pointer to "struct tomoyo_domain_info". | |
906 | * @is_delete: True if it is a delete request. | |
907 | * | |
908 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
909 | * |
910 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 911 | */ |
7ef61233 TH |
912 | static int tomoyo_update_path2_acl(const u8 type, const char *filename1, |
913 | const char *filename2, | |
914 | struct tomoyo_domain_info *const domain, | |
915 | const bool is_delete) | |
b69a54ee | 916 | { |
9e4b50e9 TH |
917 | const u8 perm = 1 << type; |
918 | struct tomoyo_path2_acl e = { | |
919 | .head.type = TOMOYO_TYPE_PATH2_ACL, | |
920 | .perm = perm | |
921 | }; | |
b69a54ee | 922 | struct tomoyo_acl_info *ptr; |
ca0b7df3 | 923 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee KT |
924 | |
925 | if (!domain) | |
926 | return -EINVAL; | |
7762fbff TH |
927 | if (!tomoyo_parse_name_union(filename1, &e.name1) || |
928 | !tomoyo_parse_name_union(filename2, &e.name2)) | |
ca0b7df3 | 929 | goto out; |
29282381 TH |
930 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
931 | goto out; | |
fdb8ebb7 | 932 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
933 | struct tomoyo_path2_acl *acl = |
934 | container_of(ptr, struct tomoyo_path2_acl, head); | |
7762fbff | 935 | if (!tomoyo_is_same_path2_acl(acl, &e)) |
b69a54ee | 936 | continue; |
ca0b7df3 TH |
937 | if (is_delete) |
938 | acl->perm &= ~perm; | |
939 | else | |
940 | acl->perm |= perm; | |
b69a54ee | 941 | error = 0; |
ca0b7df3 | 942 | break; |
cd7bec6a | 943 | } |
9e4b50e9 TH |
944 | if (!is_delete && error) { |
945 | struct tomoyo_path2_acl *entry = | |
946 | tomoyo_commit_ok(&e, sizeof(e)); | |
947 | if (entry) { | |
948 | list_add_tail_rcu(&entry->head.list, | |
949 | &domain->acl_info_list); | |
950 | error = 0; | |
951 | } | |
b69a54ee | 952 | } |
f737d95d | 953 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 954 | out: |
7762fbff TH |
955 | tomoyo_put_name_union(&e.name1); |
956 | tomoyo_put_name_union(&e.name2); | |
b69a54ee KT |
957 | return error; |
958 | } | |
959 | ||
a1f9bb6a TH |
960 | /** |
961 | * tomoyo_path_number3_acl - Check permission for path/number/number/number operation. | |
962 | * | |
963 | * @r: Pointer to "struct tomoyo_request_info". | |
964 | * @filename: Filename to check. | |
965 | * @perm: Permission. | |
966 | * @mode: Create mode. | |
967 | * @major: Device major number. | |
968 | * @minor: Device minor number. | |
969 | * | |
970 | * Returns 0 on success, -EPERM otherwise. | |
971 | * | |
972 | * Caller holds tomoyo_read_lock(). | |
973 | */ | |
974 | static int tomoyo_path_number3_acl(struct tomoyo_request_info *r, | |
975 | const struct tomoyo_path_info *filename, | |
976 | const u16 perm, const unsigned int mode, | |
977 | const unsigned int major, | |
978 | const unsigned int minor) | |
979 | { | |
980 | struct tomoyo_domain_info *domain = r->domain; | |
981 | struct tomoyo_acl_info *ptr; | |
982 | int error = -EPERM; | |
983 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { | |
984 | struct tomoyo_path_number3_acl *acl; | |
985 | if (ptr->type != TOMOYO_TYPE_PATH_NUMBER3_ACL) | |
986 | continue; | |
987 | acl = container_of(ptr, struct tomoyo_path_number3_acl, head); | |
988 | if (!tomoyo_compare_number_union(mode, &acl->mode)) | |
989 | continue; | |
990 | if (!tomoyo_compare_number_union(major, &acl->major)) | |
991 | continue; | |
992 | if (!tomoyo_compare_number_union(minor, &acl->minor)) | |
993 | continue; | |
994 | if (!(acl->perm & perm)) | |
995 | continue; | |
996 | if (!tomoyo_compare_name_union(filename, &acl->name)) | |
997 | continue; | |
998 | error = 0; | |
999 | break; | |
1000 | } | |
1001 | return error; | |
1002 | } | |
1003 | ||
b69a54ee | 1004 | /** |
7ef61233 | 1005 | * tomoyo_path2_acl - Check permission for double path operation. |
b69a54ee | 1006 | * |
cb0abe6a | 1007 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee KT |
1008 | * @type: Type of operation. |
1009 | * @filename1: First filename to check. | |
1010 | * @filename2: Second filename to check. | |
1011 | * | |
1012 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
1013 | * |
1014 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 1015 | */ |
cb0abe6a | 1016 | static int tomoyo_path2_acl(const struct tomoyo_request_info *r, const u8 type, |
7ef61233 TH |
1017 | const struct tomoyo_path_info *filename1, |
1018 | const struct tomoyo_path_info *filename2) | |
b69a54ee | 1019 | { |
cb0abe6a | 1020 | const struct tomoyo_domain_info *domain = r->domain; |
b69a54ee KT |
1021 | struct tomoyo_acl_info *ptr; |
1022 | const u8 perm = 1 << type; | |
1023 | int error = -EPERM; | |
1024 | ||
fdb8ebb7 | 1025 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
1026 | struct tomoyo_path2_acl *acl; |
1027 | if (ptr->type != TOMOYO_TYPE_PATH2_ACL) | |
b69a54ee | 1028 | continue; |
7ef61233 | 1029 | acl = container_of(ptr, struct tomoyo_path2_acl, head); |
b69a54ee KT |
1030 | if (!(acl->perm & perm)) |
1031 | continue; | |
7762fbff | 1032 | if (!tomoyo_compare_name_union(filename1, &acl->name1)) |
b69a54ee | 1033 | continue; |
7762fbff | 1034 | if (!tomoyo_compare_name_union(filename2, &acl->name2)) |
b69a54ee KT |
1035 | continue; |
1036 | error = 0; | |
1037 | break; | |
1038 | } | |
b69a54ee KT |
1039 | return error; |
1040 | } | |
1041 | ||
1042 | /** | |
cb0abe6a | 1043 | * tomoyo_path_permission - Check permission for single path operation. |
b69a54ee | 1044 | * |
cb0abe6a | 1045 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee KT |
1046 | * @operation: Type of operation. |
1047 | * @filename: Filename to check. | |
b69a54ee KT |
1048 | * |
1049 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1050 | * |
1051 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 1052 | */ |
cb0abe6a TH |
1053 | static int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation, |
1054 | const struct tomoyo_path_info *filename) | |
b69a54ee | 1055 | { |
17fcfbd9 | 1056 | const char *msg; |
b69a54ee | 1057 | int error; |
b69a54ee | 1058 | |
b69a54ee | 1059 | next: |
17fcfbd9 | 1060 | do { |
3f629636 | 1061 | error = tomoyo_path_acl(r, filename, 1 << operation); |
17fcfbd9 TH |
1062 | if (!error) |
1063 | break; | |
1064 | msg = tomoyo_path2keyword(operation); | |
1065 | tomoyo_warn_log(r, "%s %s", msg, filename->name); | |
1066 | error = tomoyo_supervisor(r, "allow_%s %s\n", msg, | |
1067 | tomoyo_file_pattern(filename)); | |
1068 | } while (error == TOMOYO_RETRY_REQUEST); | |
cb0abe6a | 1069 | if (r->mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee | 1070 | error = 0; |
b69a54ee KT |
1071 | /* |
1072 | * Since "allow_truncate" doesn't imply "allow_rewrite" permission, | |
1073 | * we need to check "allow_rewrite" permission if the filename is | |
1074 | * specified by "deny_rewrite" keyword. | |
1075 | */ | |
7ef61233 | 1076 | if (!error && operation == TOMOYO_TYPE_TRUNCATE && |
b69a54ee | 1077 | tomoyo_is_no_rewrite_file(filename)) { |
7ef61233 | 1078 | operation = TOMOYO_TYPE_REWRITE; |
b69a54ee KT |
1079 | goto next; |
1080 | } | |
1081 | return error; | |
1082 | } | |
1083 | ||
a1f9bb6a TH |
1084 | /** |
1085 | * tomoyo_path_number_acl - Check permission for ioctl/chmod/chown/chgrp operation. | |
1086 | * | |
1087 | * @r: Pointer to "struct tomoyo_request_info". | |
1088 | * @type: Operation. | |
1089 | * @filename: Filename to check. | |
1090 | * @number: Number. | |
1091 | * | |
1092 | * Returns 0 on success, -EPERM otherwise. | |
1093 | * | |
1094 | * Caller holds tomoyo_read_lock(). | |
1095 | */ | |
1096 | static int tomoyo_path_number_acl(struct tomoyo_request_info *r, const u8 type, | |
1097 | const struct tomoyo_path_info *filename, | |
1098 | const unsigned long number) | |
1099 | { | |
1100 | struct tomoyo_domain_info *domain = r->domain; | |
1101 | struct tomoyo_acl_info *ptr; | |
1102 | const u8 perm = 1 << type; | |
1103 | int error = -EPERM; | |
1104 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { | |
1105 | struct tomoyo_path_number_acl *acl; | |
1106 | if (ptr->type != TOMOYO_TYPE_PATH_NUMBER_ACL) | |
1107 | continue; | |
1108 | acl = container_of(ptr, struct tomoyo_path_number_acl, | |
1109 | head); | |
1110 | if (!(acl->perm & perm) || | |
1111 | !tomoyo_compare_number_union(number, &acl->number) || | |
1112 | !tomoyo_compare_name_union(filename, &acl->name)) | |
1113 | continue; | |
1114 | error = 0; | |
1115 | break; | |
1116 | } | |
1117 | return error; | |
1118 | } | |
1119 | ||
1120 | /** | |
1121 | * tomoyo_update_path_number_acl - Update ioctl/chmod/chown/chgrp ACL. | |
1122 | * | |
1123 | * @type: Type of operation. | |
1124 | * @filename: Filename. | |
1125 | * @number: Number. | |
1126 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1127 | * @is_delete: True if it is a delete request. | |
1128 | * | |
1129 | * Returns 0 on success, negative value otherwise. | |
1130 | */ | |
1131 | static inline int tomoyo_update_path_number_acl(const u8 type, | |
1132 | const char *filename, | |
1133 | char *number, | |
1134 | struct tomoyo_domain_info * | |
1135 | const domain, | |
1136 | const bool is_delete) | |
1137 | { | |
1138 | const u8 perm = 1 << type; | |
1139 | struct tomoyo_acl_info *ptr; | |
1140 | struct tomoyo_path_number_acl e = { | |
1141 | .head.type = TOMOYO_TYPE_PATH_NUMBER_ACL, | |
1142 | .perm = perm | |
1143 | }; | |
1144 | int error = is_delete ? -ENOENT : -ENOMEM; | |
1145 | if (!domain) | |
1146 | return -EINVAL; | |
1147 | if (!tomoyo_parse_name_union(filename, &e.name)) | |
1148 | return -EINVAL; | |
1149 | if (!tomoyo_parse_number_union(number, &e.number)) | |
1150 | goto out; | |
1151 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
1152 | goto out; | |
1153 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { | |
1154 | struct tomoyo_path_number_acl *acl = | |
1155 | container_of(ptr, struct tomoyo_path_number_acl, head); | |
1156 | if (!tomoyo_is_same_path_number_acl(acl, &e)) | |
1157 | continue; | |
1158 | if (is_delete) | |
1159 | acl->perm &= ~perm; | |
1160 | else | |
1161 | acl->perm |= perm; | |
1162 | error = 0; | |
1163 | break; | |
1164 | } | |
1165 | if (!is_delete && error) { | |
1166 | struct tomoyo_path_number_acl *entry = | |
1167 | tomoyo_commit_ok(&e, sizeof(e)); | |
1168 | if (entry) { | |
1169 | list_add_tail_rcu(&entry->head.list, | |
1170 | &domain->acl_info_list); | |
1171 | error = 0; | |
1172 | } | |
1173 | } | |
1174 | mutex_unlock(&tomoyo_policy_lock); | |
1175 | out: | |
1176 | tomoyo_put_name_union(&e.name); | |
1177 | tomoyo_put_number_union(&e.number); | |
1178 | return error; | |
1179 | } | |
1180 | ||
1181 | /** | |
1182 | * tomoyo_path_number_perm2 - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp". | |
1183 | * | |
1184 | * @r: Pointer to "strct tomoyo_request_info". | |
1185 | * @filename: Filename to check. | |
1186 | * @number: Number. | |
1187 | * | |
1188 | * Returns 0 on success, negative value otherwise. | |
1189 | * | |
1190 | * Caller holds tomoyo_read_lock(). | |
1191 | */ | |
1192 | static int tomoyo_path_number_perm2(struct tomoyo_request_info *r, | |
1193 | const u8 type, | |
1194 | const struct tomoyo_path_info *filename, | |
1195 | const unsigned long number) | |
1196 | { | |
1197 | char buffer[64]; | |
1198 | int error; | |
1199 | u8 radix; | |
17fcfbd9 | 1200 | const char *msg; |
a1f9bb6a TH |
1201 | |
1202 | if (!filename) | |
1203 | return 0; | |
1204 | switch (type) { | |
1205 | case TOMOYO_TYPE_CREATE: | |
1206 | case TOMOYO_TYPE_MKDIR: | |
1207 | case TOMOYO_TYPE_MKFIFO: | |
1208 | case TOMOYO_TYPE_MKSOCK: | |
1209 | case TOMOYO_TYPE_CHMOD: | |
1210 | radix = TOMOYO_VALUE_TYPE_OCTAL; | |
1211 | break; | |
1212 | case TOMOYO_TYPE_IOCTL: | |
1213 | radix = TOMOYO_VALUE_TYPE_HEXADECIMAL; | |
1214 | break; | |
1215 | default: | |
1216 | radix = TOMOYO_VALUE_TYPE_DECIMAL; | |
1217 | break; | |
1218 | } | |
1219 | tomoyo_print_ulong(buffer, sizeof(buffer), number, radix); | |
17fcfbd9 TH |
1220 | do { |
1221 | error = tomoyo_path_number_acl(r, type, filename, number); | |
1222 | if (!error) | |
1223 | break; | |
1224 | msg = tomoyo_path_number2keyword(type); | |
1225 | tomoyo_warn_log(r, "%s %s %s", msg, filename->name, buffer); | |
1226 | error = tomoyo_supervisor(r, "allow_%s %s %s\n", msg, | |
1227 | tomoyo_file_pattern(filename), | |
1228 | buffer); | |
1229 | } while (error == TOMOYO_RETRY_REQUEST); | |
a1f9bb6a TH |
1230 | if (r->mode != TOMOYO_CONFIG_ENFORCING) |
1231 | error = 0; | |
1232 | return error; | |
1233 | } | |
1234 | ||
1235 | /** | |
1236 | * tomoyo_path_number_perm - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp". | |
1237 | * | |
1238 | * @type: Type of operation. | |
1239 | * @path: Pointer to "struct path". | |
1240 | * @number: Number. | |
1241 | * | |
1242 | * Returns 0 on success, negative value otherwise. | |
1243 | */ | |
1244 | int tomoyo_path_number_perm(const u8 type, struct path *path, | |
1245 | unsigned long number) | |
1246 | { | |
1247 | struct tomoyo_request_info r; | |
1248 | int error = -ENOMEM; | |
c8c57e84 | 1249 | struct tomoyo_path_info buf; |
a1f9bb6a TH |
1250 | int idx; |
1251 | ||
1252 | if (tomoyo_init_request_info(&r, NULL) == TOMOYO_CONFIG_DISABLED || | |
1253 | !path->mnt || !path->dentry) | |
1254 | return 0; | |
1255 | idx = tomoyo_read_lock(); | |
c8c57e84 | 1256 | if (!tomoyo_get_realpath(&buf, path)) |
a1f9bb6a | 1257 | goto out; |
c8c57e84 TH |
1258 | if (type == TOMOYO_TYPE_MKDIR) |
1259 | tomoyo_add_slash(&buf); | |
1260 | error = tomoyo_path_number_perm2(&r, type, &buf, number); | |
a1f9bb6a | 1261 | out: |
c8c57e84 | 1262 | kfree(buf.name); |
a1f9bb6a TH |
1263 | tomoyo_read_unlock(idx); |
1264 | if (r.mode != TOMOYO_CONFIG_ENFORCING) | |
1265 | error = 0; | |
1266 | return error; | |
1267 | } | |
1268 | ||
b69a54ee KT |
1269 | /** |
1270 | * tomoyo_check_exec_perm - Check permission for "execute". | |
1271 | * | |
1272 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1273 | * @filename: Check permission for "execute". | |
b69a54ee KT |
1274 | * |
1275 | * Returns 0 on success, negativevalue otherwise. | |
fdb8ebb7 TH |
1276 | * |
1277 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
1278 | */ |
1279 | int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain, | |
bcb86975 | 1280 | const struct tomoyo_path_info *filename) |
b69a54ee | 1281 | { |
cb0abe6a | 1282 | struct tomoyo_request_info r; |
b69a54ee | 1283 | |
cb0abe6a | 1284 | if (tomoyo_init_request_info(&r, NULL) == TOMOYO_CONFIG_DISABLED) |
b69a54ee | 1285 | return 0; |
cb0abe6a | 1286 | return tomoyo_file_perm(&r, filename, 1); |
b69a54ee KT |
1287 | } |
1288 | ||
1289 | /** | |
1290 | * tomoyo_check_open_permission - Check permission for "read" and "write". | |
1291 | * | |
1292 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1293 | * @path: Pointer to "struct path". | |
1294 | * @flag: Flags for open(). | |
1295 | * | |
1296 | * Returns 0 on success, negative value otherwise. | |
1297 | */ | |
1298 | int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, | |
1299 | struct path *path, const int flag) | |
1300 | { | |
1301 | const u8 acc_mode = ACC_MODE(flag); | |
1302 | int error = -ENOMEM; | |
c8c57e84 | 1303 | struct tomoyo_path_info buf; |
cb0abe6a | 1304 | struct tomoyo_request_info r; |
fdb8ebb7 | 1305 | int idx; |
b69a54ee | 1306 | |
cb0abe6a TH |
1307 | if (tomoyo_init_request_info(&r, domain) == TOMOYO_CONFIG_DISABLED || |
1308 | !path->mnt) | |
b69a54ee KT |
1309 | return 0; |
1310 | if (acc_mode == 0) | |
1311 | return 0; | |
1312 | if (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode)) | |
1313 | /* | |
1314 | * I don't check directories here because mkdir() and rmdir() | |
1315 | * don't call me. | |
1316 | */ | |
1317 | return 0; | |
fdb8ebb7 | 1318 | idx = tomoyo_read_lock(); |
c8c57e84 | 1319 | if (!tomoyo_get_realpath(&buf, path)) |
b69a54ee KT |
1320 | goto out; |
1321 | error = 0; | |
1322 | /* | |
1323 | * If the filename is specified by "deny_rewrite" keyword, | |
1324 | * we need to check "allow_rewrite" permission when the filename is not | |
1325 | * opened for append mode or the filename is truncated at open time. | |
1326 | */ | |
1327 | if ((acc_mode & MAY_WRITE) && | |
1328 | ((flag & O_TRUNC) || !(flag & O_APPEND)) && | |
c8c57e84 TH |
1329 | (tomoyo_is_no_rewrite_file(&buf))) { |
1330 | error = tomoyo_path_permission(&r, TOMOYO_TYPE_REWRITE, &buf); | |
b69a54ee KT |
1331 | } |
1332 | if (!error) | |
c8c57e84 | 1333 | error = tomoyo_file_perm(&r, &buf, acc_mode); |
b69a54ee | 1334 | if (!error && (flag & O_TRUNC)) |
c8c57e84 | 1335 | error = tomoyo_path_permission(&r, TOMOYO_TYPE_TRUNCATE, &buf); |
b69a54ee | 1336 | out: |
c8c57e84 | 1337 | kfree(buf.name); |
fdb8ebb7 | 1338 | tomoyo_read_unlock(idx); |
cb0abe6a | 1339 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1340 | error = 0; |
1341 | return error; | |
1342 | } | |
1343 | ||
1344 | /** | |
2106ccd9 | 1345 | * tomoyo_path_perm - Check permission for "unlink", "rmdir", "truncate", "symlink", "rewrite", "chroot" and "unmount". |
b69a54ee | 1346 | * |
b69a54ee KT |
1347 | * @operation: Type of operation. |
1348 | * @path: Pointer to "struct path". | |
1349 | * | |
1350 | * Returns 0 on success, negative value otherwise. | |
1351 | */ | |
97d6931e | 1352 | int tomoyo_path_perm(const u8 operation, struct path *path) |
b69a54ee KT |
1353 | { |
1354 | int error = -ENOMEM; | |
c8c57e84 | 1355 | struct tomoyo_path_info buf; |
cb0abe6a | 1356 | struct tomoyo_request_info r; |
fdb8ebb7 | 1357 | int idx; |
b69a54ee | 1358 | |
cb0abe6a TH |
1359 | if (tomoyo_init_request_info(&r, NULL) == TOMOYO_CONFIG_DISABLED || |
1360 | !path->mnt) | |
b69a54ee | 1361 | return 0; |
fdb8ebb7 | 1362 | idx = tomoyo_read_lock(); |
c8c57e84 | 1363 | if (!tomoyo_get_realpath(&buf, path)) |
b69a54ee KT |
1364 | goto out; |
1365 | switch (operation) { | |
cb0abe6a | 1366 | case TOMOYO_TYPE_REWRITE: |
c8c57e84 | 1367 | if (!tomoyo_is_no_rewrite_file(&buf)) { |
cb0abe6a TH |
1368 | error = 0; |
1369 | goto out; | |
1370 | } | |
1371 | break; | |
7ef61233 TH |
1372 | case TOMOYO_TYPE_RMDIR: |
1373 | case TOMOYO_TYPE_CHROOT: | |
c8c57e84 TH |
1374 | tomoyo_add_slash(&buf); |
1375 | break; | |
b69a54ee | 1376 | } |
c8c57e84 | 1377 | error = tomoyo_path_permission(&r, operation, &buf); |
b69a54ee | 1378 | out: |
c8c57e84 | 1379 | kfree(buf.name); |
fdb8ebb7 | 1380 | tomoyo_read_unlock(idx); |
cb0abe6a | 1381 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1382 | error = 0; |
1383 | return error; | |
1384 | } | |
1385 | ||
a1f9bb6a TH |
1386 | /** |
1387 | * tomoyo_path_number3_perm2 - Check permission for path/number/number/number operation. | |
1388 | * | |
1389 | * @r: Pointer to "struct tomoyo_request_info". | |
1390 | * @operation: Type of operation. | |
1391 | * @filename: Filename to check. | |
1392 | * @mode: Create mode. | |
1393 | * @dev: Device number. | |
1394 | * | |
1395 | * Returns 0 on success, negative value otherwise. | |
1396 | * | |
1397 | * Caller holds tomoyo_read_lock(). | |
1398 | */ | |
1399 | static int tomoyo_path_number3_perm2(struct tomoyo_request_info *r, | |
1400 | const u8 operation, | |
1401 | const struct tomoyo_path_info *filename, | |
1402 | const unsigned int mode, | |
1403 | const unsigned int dev) | |
1404 | { | |
1405 | int error; | |
17fcfbd9 | 1406 | const char *msg; |
a1f9bb6a TH |
1407 | const unsigned int major = MAJOR(dev); |
1408 | const unsigned int minor = MINOR(dev); | |
1409 | ||
17fcfbd9 TH |
1410 | do { |
1411 | error = tomoyo_path_number3_acl(r, filename, 1 << operation, | |
1412 | mode, major, minor); | |
1413 | if (!error) | |
1414 | break; | |
1415 | msg = tomoyo_path_number32keyword(operation); | |
1416 | tomoyo_warn_log(r, "%s %s 0%o %u %u", msg, filename->name, | |
1417 | mode, major, minor); | |
1418 | error = tomoyo_supervisor(r, "allow_%s %s 0%o %u %u\n", msg, | |
1419 | tomoyo_file_pattern(filename), mode, | |
1420 | major, minor); | |
1421 | } while (error == TOMOYO_RETRY_REQUEST); | |
1422 | if (r->mode != TOMOYO_CONFIG_ENFORCING) | |
a1f9bb6a TH |
1423 | error = 0; |
1424 | return error; | |
1425 | } | |
1426 | ||
1427 | /** | |
1428 | * tomoyo_path_number3_perm - Check permission for "mkblock" and "mkchar". | |
1429 | * | |
1430 | * @operation: Type of operation. (TOMOYO_TYPE_MKCHAR or TOMOYO_TYPE_MKBLOCK) | |
1431 | * @path: Pointer to "struct path". | |
1432 | * @mode: Create mode. | |
1433 | * @dev: Device number. | |
1434 | * | |
1435 | * Returns 0 on success, negative value otherwise. | |
1436 | */ | |
1437 | int tomoyo_path_number3_perm(const u8 operation, struct path *path, | |
1438 | const unsigned int mode, unsigned int dev) | |
1439 | { | |
1440 | struct tomoyo_request_info r; | |
1441 | int error = -ENOMEM; | |
c8c57e84 | 1442 | struct tomoyo_path_info buf; |
a1f9bb6a TH |
1443 | int idx; |
1444 | ||
1445 | if (tomoyo_init_request_info(&r, NULL) == TOMOYO_CONFIG_DISABLED || | |
1446 | !path->mnt) | |
1447 | return 0; | |
1448 | idx = tomoyo_read_lock(); | |
1449 | error = -ENOMEM; | |
c8c57e84 TH |
1450 | if (tomoyo_get_realpath(&buf, path)) { |
1451 | error = tomoyo_path_number3_perm2(&r, operation, &buf, mode, | |
a1f9bb6a | 1452 | new_decode_dev(dev)); |
c8c57e84 | 1453 | kfree(buf.name); |
a1f9bb6a TH |
1454 | } |
1455 | tomoyo_read_unlock(idx); | |
1456 | if (r.mode != TOMOYO_CONFIG_ENFORCING) | |
1457 | error = 0; | |
1458 | return error; | |
1459 | } | |
1460 | ||
b69a54ee | 1461 | /** |
7ef61233 | 1462 | * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root". |
b69a54ee | 1463 | * |
b69a54ee KT |
1464 | * @operation: Type of operation. |
1465 | * @path1: Pointer to "struct path". | |
1466 | * @path2: Pointer to "struct path". | |
1467 | * | |
1468 | * Returns 0 on success, negative value otherwise. | |
1469 | */ | |
97d6931e | 1470 | int tomoyo_path2_perm(const u8 operation, struct path *path1, |
7ef61233 | 1471 | struct path *path2) |
b69a54ee KT |
1472 | { |
1473 | int error = -ENOMEM; | |
17fcfbd9 | 1474 | const char *msg; |
c8c57e84 TH |
1475 | struct tomoyo_path_info buf1; |
1476 | struct tomoyo_path_info buf2; | |
cb0abe6a | 1477 | struct tomoyo_request_info r; |
fdb8ebb7 | 1478 | int idx; |
b69a54ee | 1479 | |
cb0abe6a TH |
1480 | if (tomoyo_init_request_info(&r, NULL) == TOMOYO_CONFIG_DISABLED || |
1481 | !path1->mnt || !path2->mnt) | |
b69a54ee | 1482 | return 0; |
c8c57e84 TH |
1483 | buf1.name = NULL; |
1484 | buf2.name = NULL; | |
fdb8ebb7 | 1485 | idx = tomoyo_read_lock(); |
c8c57e84 TH |
1486 | if (!tomoyo_get_realpath(&buf1, path1) || |
1487 | !tomoyo_get_realpath(&buf2, path2)) | |
b69a54ee KT |
1488 | goto out; |
1489 | { | |
1490 | struct dentry *dentry = path1->dentry; | |
1491 | if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) { | |
c8c57e84 TH |
1492 | tomoyo_add_slash(&buf1); |
1493 | tomoyo_add_slash(&buf2); | |
b69a54ee KT |
1494 | } |
1495 | } | |
17fcfbd9 | 1496 | do { |
c8c57e84 | 1497 | error = tomoyo_path2_acl(&r, operation, &buf1, &buf2); |
17fcfbd9 TH |
1498 | if (!error) |
1499 | break; | |
1500 | msg = tomoyo_path22keyword(operation); | |
c8c57e84 | 1501 | tomoyo_warn_log(&r, "%s %s %s", msg, buf1.name, buf2.name); |
17fcfbd9 | 1502 | error = tomoyo_supervisor(&r, "allow_%s %s %s\n", msg, |
c8c57e84 TH |
1503 | tomoyo_file_pattern(&buf1), |
1504 | tomoyo_file_pattern(&buf2)); | |
17fcfbd9 | 1505 | } while (error == TOMOYO_RETRY_REQUEST); |
b69a54ee | 1506 | out: |
c8c57e84 TH |
1507 | kfree(buf1.name); |
1508 | kfree(buf2.name); | |
fdb8ebb7 | 1509 | tomoyo_read_unlock(idx); |
cb0abe6a | 1510 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1511 | error = 0; |
1512 | return error; | |
1513 | } | |
a1f9bb6a TH |
1514 | |
1515 | /** | |
1516 | * tomoyo_write_file_policy - Update file related list. | |
1517 | * | |
1518 | * @data: String to parse. | |
1519 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1520 | * @is_delete: True if it is a delete request. | |
1521 | * | |
1522 | * Returns 0 on success, negative value otherwise. | |
1523 | * | |
1524 | * Caller holds tomoyo_read_lock(). | |
1525 | */ | |
1526 | int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, | |
1527 | const bool is_delete) | |
1528 | { | |
1529 | char *w[5]; | |
1530 | u8 type; | |
1531 | if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0]) | |
1532 | return -EINVAL; | |
1533 | if (strncmp(w[0], "allow_", 6)) { | |
1534 | unsigned int perm; | |
1535 | if (sscanf(w[0], "%u", &perm) == 1) | |
1536 | return tomoyo_update_file_acl((u8) perm, w[1], domain, | |
1537 | is_delete); | |
1538 | goto out; | |
1539 | } | |
1540 | w[0] += 6; | |
1541 | for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) { | |
1542 | if (strcmp(w[0], tomoyo_path_keyword[type])) | |
1543 | continue; | |
1544 | return tomoyo_update_path_acl(type, w[1], domain, is_delete); | |
1545 | } | |
1546 | if (!w[2][0]) | |
1547 | goto out; | |
1548 | for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) { | |
1549 | if (strcmp(w[0], tomoyo_path2_keyword[type])) | |
1550 | continue; | |
1551 | return tomoyo_update_path2_acl(type, w[1], w[2], domain, | |
1552 | is_delete); | |
1553 | } | |
1554 | for (type = 0; type < TOMOYO_MAX_PATH_NUMBER_OPERATION; type++) { | |
1555 | if (strcmp(w[0], tomoyo_path_number_keyword[type])) | |
1556 | continue; | |
1557 | return tomoyo_update_path_number_acl(type, w[1], w[2], domain, | |
1558 | is_delete); | |
1559 | } | |
1560 | if (!w[3][0] || !w[4][0]) | |
1561 | goto out; | |
1562 | for (type = 0; type < TOMOYO_MAX_PATH_NUMBER3_OPERATION; type++) { | |
1563 | if (strcmp(w[0], tomoyo_path_number3_keyword[type])) | |
1564 | continue; | |
1565 | return tomoyo_update_path_number3_acl(type, w[1], w[2], w[3], | |
1566 | w[4], domain, is_delete); | |
1567 | } | |
1568 | out: | |
1569 | return -EINVAL; | |
1570 | } |