Commit | Line | Data |
---|---|---|
b69a54ee KT |
1 | /* |
2 | * security/tomoyo/file.c | |
3 | * | |
4 | * Implementation of the Domain-Based Mandatory Access Control. | |
5 | * | |
6 | * Copyright (C) 2005-2009 NTT DATA CORPORATION | |
7 | * | |
39826a1e | 8 | * Version: 2.2.0 2009/04/01 |
b69a54ee KT |
9 | * |
10 | */ | |
11 | ||
12 | #include "common.h" | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
b69a54ee | 14 | |
a1f9bb6a | 15 | /* Keyword array for operations with one pathname. */ |
7ef61233 TH |
16 | static const char *tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = { |
17 | [TOMOYO_TYPE_READ_WRITE] = "read/write", | |
18 | [TOMOYO_TYPE_EXECUTE] = "execute", | |
19 | [TOMOYO_TYPE_READ] = "read", | |
20 | [TOMOYO_TYPE_WRITE] = "write", | |
7ef61233 | 21 | [TOMOYO_TYPE_UNLINK] = "unlink", |
7ef61233 | 22 | [TOMOYO_TYPE_RMDIR] = "rmdir", |
7ef61233 TH |
23 | [TOMOYO_TYPE_TRUNCATE] = "truncate", |
24 | [TOMOYO_TYPE_SYMLINK] = "symlink", | |
25 | [TOMOYO_TYPE_REWRITE] = "rewrite", | |
7ef61233 TH |
26 | [TOMOYO_TYPE_CHROOT] = "chroot", |
27 | [TOMOYO_TYPE_MOUNT] = "mount", | |
28 | [TOMOYO_TYPE_UMOUNT] = "unmount", | |
b69a54ee KT |
29 | }; |
30 | ||
a1f9bb6a TH |
31 | /* Keyword array for operations with one pathname and three numbers. */ |
32 | static const char *tomoyo_path_number3_keyword | |
33 | [TOMOYO_MAX_PATH_NUMBER3_OPERATION] = { | |
34 | [TOMOYO_TYPE_MKBLOCK] = "mkblock", | |
35 | [TOMOYO_TYPE_MKCHAR] = "mkchar", | |
36 | }; | |
37 | ||
38 | /* Keyword array for operations with two pathnames. */ | |
7ef61233 | 39 | static const char *tomoyo_path2_keyword[TOMOYO_MAX_PATH2_OPERATION] = { |
a1f9bb6a TH |
40 | [TOMOYO_TYPE_LINK] = "link", |
41 | [TOMOYO_TYPE_RENAME] = "rename", | |
7ef61233 | 42 | [TOMOYO_TYPE_PIVOT_ROOT] = "pivot_root", |
b69a54ee KT |
43 | }; |
44 | ||
a1f9bb6a TH |
45 | /* Keyword array for operations with one pathname and one number. */ |
46 | static const char *tomoyo_path_number_keyword | |
47 | [TOMOYO_MAX_PATH_NUMBER_OPERATION] = { | |
48 | [TOMOYO_TYPE_CREATE] = "create", | |
49 | [TOMOYO_TYPE_MKDIR] = "mkdir", | |
50 | [TOMOYO_TYPE_MKFIFO] = "mkfifo", | |
51 | [TOMOYO_TYPE_MKSOCK] = "mksock", | |
52 | [TOMOYO_TYPE_IOCTL] = "ioctl", | |
53 | [TOMOYO_TYPE_CHMOD] = "chmod", | |
54 | [TOMOYO_TYPE_CHOWN] = "chown", | |
55 | [TOMOYO_TYPE_CHGRP] = "chgrp", | |
56 | }; | |
57 | ||
7762fbff TH |
58 | void tomoyo_put_name_union(struct tomoyo_name_union *ptr) |
59 | { | |
60 | if (!ptr) | |
61 | return; | |
62 | if (ptr->is_group) | |
63 | tomoyo_put_path_group(ptr->group); | |
64 | else | |
65 | tomoyo_put_name(ptr->filename); | |
66 | } | |
67 | ||
68 | bool tomoyo_compare_name_union(const struct tomoyo_path_info *name, | |
69 | const struct tomoyo_name_union *ptr) | |
70 | { | |
71 | if (ptr->is_group) | |
72 | return tomoyo_path_matches_group(name, ptr->group, 1); | |
73 | return tomoyo_path_matches_pattern(name, ptr->filename); | |
74 | } | |
75 | ||
76 | static bool tomoyo_compare_name_union_pattern(const struct tomoyo_path_info | |
77 | *name, | |
78 | const struct tomoyo_name_union | |
79 | *ptr, const bool may_use_pattern) | |
80 | { | |
81 | if (ptr->is_group) | |
82 | return tomoyo_path_matches_group(name, ptr->group, | |
83 | may_use_pattern); | |
84 | if (may_use_pattern || !ptr->filename->is_patterned) | |
85 | return tomoyo_path_matches_pattern(name, ptr->filename); | |
86 | return false; | |
87 | } | |
88 | ||
4c3e9e2d TH |
89 | void tomoyo_put_number_union(struct tomoyo_number_union *ptr) |
90 | { | |
91 | if (ptr && ptr->is_group) | |
92 | tomoyo_put_number_group(ptr->group); | |
93 | } | |
94 | ||
95 | bool tomoyo_compare_number_union(const unsigned long value, | |
96 | const struct tomoyo_number_union *ptr) | |
97 | { | |
98 | if (ptr->is_group) | |
99 | return tomoyo_number_matches_group(value, value, ptr->group); | |
100 | return value >= ptr->values[0] && value <= ptr->values[1]; | |
101 | } | |
102 | ||
cb0abe6a TH |
103 | /** |
104 | * tomoyo_init_request_info - Initialize "struct tomoyo_request_info" members. | |
105 | * | |
106 | * @r: Pointer to "struct tomoyo_request_info" to initialize. | |
107 | * @domain: Pointer to "struct tomoyo_domain_info". NULL for tomoyo_domain(). | |
108 | * | |
109 | * Returns mode. | |
110 | */ | |
111 | static int tomoyo_init_request_info(struct tomoyo_request_info *r, | |
112 | struct tomoyo_domain_info *domain) | |
113 | { | |
114 | memset(r, 0, sizeof(*r)); | |
115 | if (!domain) | |
116 | domain = tomoyo_domain(); | |
117 | r->domain = domain; | |
118 | r->mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
119 | return r->mode; | |
120 | } | |
121 | ||
122 | static void tomoyo_warn_log(struct tomoyo_request_info *r, const char *fmt, ...) | |
123 | __attribute__ ((format(printf, 2, 3))); | |
124 | /** | |
125 | * tomoyo_warn_log - Print warning or error message on console. | |
126 | * | |
127 | * @r: Pointer to "struct tomoyo_request_info". | |
128 | * @fmt: The printf()'s format string, followed by parameters. | |
129 | */ | |
130 | static void tomoyo_warn_log(struct tomoyo_request_info *r, const char *fmt, ...) | |
131 | { | |
132 | int len = PAGE_SIZE; | |
133 | va_list args; | |
134 | char *buffer; | |
135 | if (!tomoyo_verbose_mode(r->domain)) | |
136 | return; | |
137 | while (1) { | |
138 | int len2; | |
139 | buffer = kmalloc(len, GFP_NOFS); | |
140 | if (!buffer) | |
141 | return; | |
142 | va_start(args, fmt); | |
143 | len2 = vsnprintf(buffer, len - 1, fmt, args); | |
144 | va_end(args); | |
145 | if (len2 <= len - 1) { | |
146 | buffer[len2] = '\0'; | |
147 | break; | |
148 | } | |
149 | len = len2 + 1; | |
150 | kfree(buffer); | |
151 | } | |
152 | printk(KERN_WARNING "TOMOYO-%s: Access %s denied for %s\n", | |
153 | r->mode == TOMOYO_CONFIG_ENFORCING ? "ERROR" : "WARNING", | |
154 | buffer, tomoyo_get_last_name(r->domain)); | |
155 | kfree(buffer); | |
156 | } | |
157 | ||
b69a54ee | 158 | /** |
7ef61233 | 159 | * tomoyo_path2keyword - Get the name of single path operation. |
b69a54ee KT |
160 | * |
161 | * @operation: Type of operation. | |
162 | * | |
163 | * Returns the name of single path operation. | |
164 | */ | |
7ef61233 | 165 | const char *tomoyo_path2keyword(const u8 operation) |
b69a54ee | 166 | { |
7ef61233 TH |
167 | return (operation < TOMOYO_MAX_PATH_OPERATION) |
168 | ? tomoyo_path_keyword[operation] : NULL; | |
b69a54ee KT |
169 | } |
170 | ||
a1f9bb6a TH |
171 | /** |
172 | * tomoyo_path_number32keyword - Get the name of path/number/number/number operations. | |
173 | * | |
174 | * @operation: Type of operation. | |
175 | * | |
176 | * Returns the name of path/number/number/number operation. | |
177 | */ | |
178 | const char *tomoyo_path_number32keyword(const u8 operation) | |
179 | { | |
180 | return (operation < TOMOYO_MAX_PATH_NUMBER3_OPERATION) | |
181 | ? tomoyo_path_number3_keyword[operation] : NULL; | |
182 | } | |
183 | ||
b69a54ee | 184 | /** |
7ef61233 | 185 | * tomoyo_path22keyword - Get the name of double path operation. |
b69a54ee KT |
186 | * |
187 | * @operation: Type of operation. | |
188 | * | |
189 | * Returns the name of double path operation. | |
190 | */ | |
7ef61233 | 191 | const char *tomoyo_path22keyword(const u8 operation) |
b69a54ee | 192 | { |
7ef61233 TH |
193 | return (operation < TOMOYO_MAX_PATH2_OPERATION) |
194 | ? tomoyo_path2_keyword[operation] : NULL; | |
b69a54ee KT |
195 | } |
196 | ||
a1f9bb6a TH |
197 | /** |
198 | * tomoyo_path_number2keyword - Get the name of path/number operations. | |
199 | * | |
200 | * @operation: Type of operation. | |
201 | * | |
202 | * Returns the name of path/number operation. | |
203 | */ | |
204 | const char *tomoyo_path_number2keyword(const u8 operation) | |
205 | { | |
206 | return (operation < TOMOYO_MAX_PATH_NUMBER_OPERATION) | |
207 | ? tomoyo_path_number_keyword[operation] : NULL; | |
208 | } | |
209 | ||
b69a54ee KT |
210 | /** |
211 | * tomoyo_strendswith - Check whether the token ends with the given token. | |
212 | * | |
213 | * @name: The token to check. | |
214 | * @tail: The token to find. | |
215 | * | |
216 | * Returns true if @name ends with @tail, false otherwise. | |
217 | */ | |
218 | static bool tomoyo_strendswith(const char *name, const char *tail) | |
219 | { | |
220 | int len; | |
221 | ||
222 | if (!name || !tail) | |
223 | return false; | |
224 | len = strlen(name) - strlen(tail); | |
225 | return len >= 0 && !strcmp(name + len, tail); | |
226 | } | |
227 | ||
228 | /** | |
229 | * tomoyo_get_path - Get realpath. | |
230 | * | |
231 | * @path: Pointer to "struct path". | |
232 | * | |
233 | * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise. | |
234 | */ | |
235 | static struct tomoyo_path_info *tomoyo_get_path(struct path *path) | |
236 | { | |
237 | int error; | |
8e2d39a1 | 238 | struct tomoyo_path_info_with_data *buf = kzalloc(sizeof(*buf), |
4e5d6f7e | 239 | GFP_NOFS); |
b69a54ee KT |
240 | |
241 | if (!buf) | |
242 | return NULL; | |
243 | /* Reserve one byte for appending "/". */ | |
244 | error = tomoyo_realpath_from_path2(path, buf->body, | |
245 | sizeof(buf->body) - 2); | |
246 | if (!error) { | |
247 | buf->head.name = buf->body; | |
248 | tomoyo_fill_path_info(&buf->head); | |
249 | return &buf->head; | |
250 | } | |
8e2d39a1 | 251 | kfree(buf); |
b69a54ee KT |
252 | return NULL; |
253 | } | |
254 | ||
7ef61233 TH |
255 | static int tomoyo_update_path2_acl(const u8 type, const char *filename1, |
256 | const char *filename2, | |
257 | struct tomoyo_domain_info *const domain, | |
258 | const bool is_delete); | |
259 | static int tomoyo_update_path_acl(const u8 type, const char *filename, | |
260 | struct tomoyo_domain_info *const domain, | |
261 | const bool is_delete); | |
b69a54ee | 262 | |
c3fa109a TH |
263 | /* |
264 | * tomoyo_globally_readable_list is used for holding list of pathnames which | |
265 | * are by default allowed to be open()ed for reading by any process. | |
266 | * | |
267 | * An entry is added by | |
268 | * | |
269 | * # echo 'allow_read /lib/libc-2.5.so' > \ | |
270 | * /sys/kernel/security/tomoyo/exception_policy | |
271 | * | |
272 | * and is deleted by | |
273 | * | |
274 | * # echo 'delete allow_read /lib/libc-2.5.so' > \ | |
275 | * /sys/kernel/security/tomoyo/exception_policy | |
276 | * | |
277 | * and all entries are retrieved by | |
278 | * | |
279 | * # grep ^allow_read /sys/kernel/security/tomoyo/exception_policy | |
280 | * | |
281 | * In the example above, any process is allowed to | |
282 | * open("/lib/libc-2.5.so", O_RDONLY). | |
283 | * One exception is, if the domain which current process belongs to is marked | |
284 | * as "ignore_global_allow_read", current process can't do so unless explicitly | |
285 | * given "allow_read /lib/libc-2.5.so" to the domain which current process | |
286 | * belongs to. | |
287 | */ | |
847b173e | 288 | LIST_HEAD(tomoyo_globally_readable_list); |
b69a54ee KT |
289 | |
290 | /** | |
291 | * tomoyo_update_globally_readable_entry - Update "struct tomoyo_globally_readable_file_entry" list. | |
292 | * | |
293 | * @filename: Filename unconditionally permitted to open() for reading. | |
294 | * @is_delete: True if it is a delete request. | |
295 | * | |
296 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
297 | * |
298 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
299 | */ |
300 | static int tomoyo_update_globally_readable_entry(const char *filename, | |
301 | const bool is_delete) | |
302 | { | |
b69a54ee | 303 | struct tomoyo_globally_readable_file_entry *ptr; |
9e4b50e9 | 304 | struct tomoyo_globally_readable_file_entry e = { }; |
ca0b7df3 | 305 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 306 | |
17080008 | 307 | if (!tomoyo_is_correct_path(filename, 1, 0, -1)) |
b69a54ee | 308 | return -EINVAL; |
9e4b50e9 TH |
309 | e.filename = tomoyo_get_name(filename); |
310 | if (!e.filename) | |
b69a54ee | 311 | return -ENOMEM; |
29282381 TH |
312 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
313 | goto out; | |
fdb8ebb7 | 314 | list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { |
9e4b50e9 | 315 | if (ptr->filename != e.filename) |
b69a54ee KT |
316 | continue; |
317 | ptr->is_deleted = is_delete; | |
318 | error = 0; | |
ca0b7df3 | 319 | break; |
b69a54ee | 320 | } |
9e4b50e9 TH |
321 | if (!is_delete && error) { |
322 | struct tomoyo_globally_readable_file_entry *entry = | |
323 | tomoyo_commit_ok(&e, sizeof(e)); | |
324 | if (entry) { | |
325 | list_add_tail_rcu(&entry->list, | |
326 | &tomoyo_globally_readable_list); | |
327 | error = 0; | |
328 | } | |
b69a54ee | 329 | } |
f737d95d | 330 | mutex_unlock(&tomoyo_policy_lock); |
29282381 | 331 | out: |
9e4b50e9 | 332 | tomoyo_put_name(e.filename); |
b69a54ee KT |
333 | return error; |
334 | } | |
335 | ||
336 | /** | |
337 | * tomoyo_is_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading. | |
338 | * | |
339 | * @filename: The filename to check. | |
340 | * | |
341 | * Returns true if any domain can open @filename for reading, false otherwise. | |
fdb8ebb7 TH |
342 | * |
343 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
344 | */ |
345 | static bool tomoyo_is_globally_readable_file(const struct tomoyo_path_info * | |
346 | filename) | |
347 | { | |
348 | struct tomoyo_globally_readable_file_entry *ptr; | |
349 | bool found = false; | |
fdb8ebb7 TH |
350 | |
351 | list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { | |
b69a54ee KT |
352 | if (!ptr->is_deleted && |
353 | tomoyo_path_matches_pattern(filename, ptr->filename)) { | |
354 | found = true; | |
355 | break; | |
356 | } | |
357 | } | |
b69a54ee KT |
358 | return found; |
359 | } | |
360 | ||
361 | /** | |
362 | * tomoyo_write_globally_readable_policy - Write "struct tomoyo_globally_readable_file_entry" list. | |
363 | * | |
364 | * @data: String to parse. | |
365 | * @is_delete: True if it is a delete request. | |
366 | * | |
367 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
368 | * |
369 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
370 | */ |
371 | int tomoyo_write_globally_readable_policy(char *data, const bool is_delete) | |
372 | { | |
373 | return tomoyo_update_globally_readable_entry(data, is_delete); | |
374 | } | |
375 | ||
376 | /** | |
377 | * tomoyo_read_globally_readable_policy - Read "struct tomoyo_globally_readable_file_entry" list. | |
378 | * | |
379 | * @head: Pointer to "struct tomoyo_io_buffer". | |
380 | * | |
381 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
382 | * |
383 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
384 | */ |
385 | bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head) | |
386 | { | |
387 | struct list_head *pos; | |
388 | bool done = true; | |
389 | ||
b69a54ee KT |
390 | list_for_each_cookie(pos, head->read_var2, |
391 | &tomoyo_globally_readable_list) { | |
392 | struct tomoyo_globally_readable_file_entry *ptr; | |
393 | ptr = list_entry(pos, | |
394 | struct tomoyo_globally_readable_file_entry, | |
395 | list); | |
396 | if (ptr->is_deleted) | |
397 | continue; | |
7d2948b1 TH |
398 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_READ "%s\n", |
399 | ptr->filename->name); | |
400 | if (!done) | |
b69a54ee | 401 | break; |
b69a54ee | 402 | } |
b69a54ee KT |
403 | return done; |
404 | } | |
405 | ||
c3fa109a TH |
406 | /* tomoyo_pattern_list is used for holding list of pathnames which are used for |
407 | * converting pathnames to pathname patterns during learning mode. | |
408 | * | |
409 | * An entry is added by | |
410 | * | |
411 | * # echo 'file_pattern /proc/\$/mounts' > \ | |
412 | * /sys/kernel/security/tomoyo/exception_policy | |
413 | * | |
414 | * and is deleted by | |
415 | * | |
416 | * # echo 'delete file_pattern /proc/\$/mounts' > \ | |
417 | * /sys/kernel/security/tomoyo/exception_policy | |
418 | * | |
419 | * and all entries are retrieved by | |
420 | * | |
421 | * # grep ^file_pattern /sys/kernel/security/tomoyo/exception_policy | |
422 | * | |
423 | * In the example above, if a process which belongs to a domain which is in | |
424 | * learning mode requested open("/proc/1/mounts", O_RDONLY), | |
425 | * "allow_read /proc/\$/mounts" is automatically added to the domain which that | |
426 | * process belongs to. | |
427 | * | |
428 | * It is not a desirable behavior that we have to use /proc/\$/ instead of | |
429 | * /proc/self/ when current process needs to access only current process's | |
430 | * information. As of now, LSM version of TOMOYO is using __d_path() for | |
431 | * calculating pathname. Non LSM version of TOMOYO is using its own function | |
432 | * which pretends as if /proc/self/ is not a symlink; so that we can forbid | |
433 | * current process from accessing other process's information. | |
434 | */ | |
847b173e | 435 | LIST_HEAD(tomoyo_pattern_list); |
b69a54ee KT |
436 | |
437 | /** | |
438 | * tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list. | |
439 | * | |
440 | * @pattern: Pathname pattern. | |
441 | * @is_delete: True if it is a delete request. | |
442 | * | |
443 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
444 | * |
445 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
446 | */ |
447 | static int tomoyo_update_file_pattern_entry(const char *pattern, | |
448 | const bool is_delete) | |
449 | { | |
b69a54ee | 450 | struct tomoyo_pattern_entry *ptr; |
9e4b50e9 | 451 | struct tomoyo_pattern_entry e = { .pattern = tomoyo_get_name(pattern) }; |
ca0b7df3 | 452 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 453 | |
9e4b50e9 | 454 | if (!e.pattern) |
ca0b7df3 | 455 | return error; |
9e4b50e9 | 456 | if (!e.pattern->is_patterned) |
ca0b7df3 | 457 | goto out; |
29282381 TH |
458 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
459 | goto out; | |
fdb8ebb7 | 460 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { |
9e4b50e9 | 461 | if (e.pattern != ptr->pattern) |
b69a54ee KT |
462 | continue; |
463 | ptr->is_deleted = is_delete; | |
464 | error = 0; | |
ca0b7df3 | 465 | break; |
b69a54ee | 466 | } |
9e4b50e9 TH |
467 | if (!is_delete && error) { |
468 | struct tomoyo_pattern_entry *entry = | |
469 | tomoyo_commit_ok(&e, sizeof(e)); | |
470 | if (entry) { | |
471 | list_add_tail_rcu(&entry->list, &tomoyo_pattern_list); | |
472 | error = 0; | |
473 | } | |
b69a54ee | 474 | } |
f737d95d | 475 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 476 | out: |
9e4b50e9 | 477 | tomoyo_put_name(e.pattern); |
b69a54ee KT |
478 | return error; |
479 | } | |
480 | ||
481 | /** | |
482 | * tomoyo_get_file_pattern - Get patterned pathname. | |
483 | * | |
484 | * @filename: The filename to find patterned pathname. | |
485 | * | |
486 | * Returns pointer to pathname pattern if matched, @filename otherwise. | |
fdb8ebb7 TH |
487 | * |
488 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
489 | */ |
490 | static const struct tomoyo_path_info * | |
491 | tomoyo_get_file_pattern(const struct tomoyo_path_info *filename) | |
492 | { | |
493 | struct tomoyo_pattern_entry *ptr; | |
494 | const struct tomoyo_path_info *pattern = NULL; | |
495 | ||
fdb8ebb7 | 496 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { |
b69a54ee KT |
497 | if (ptr->is_deleted) |
498 | continue; | |
499 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
500 | continue; | |
501 | pattern = ptr->pattern; | |
502 | if (tomoyo_strendswith(pattern->name, "/\\*")) { | |
503 | /* Do nothing. Try to find the better match. */ | |
504 | } else { | |
505 | /* This would be the better match. Use this. */ | |
506 | break; | |
507 | } | |
508 | } | |
b69a54ee KT |
509 | if (pattern) |
510 | filename = pattern; | |
511 | return filename; | |
512 | } | |
513 | ||
514 | /** | |
515 | * tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list. | |
516 | * | |
517 | * @data: String to parse. | |
518 | * @is_delete: True if it is a delete request. | |
519 | * | |
520 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
521 | * |
522 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
523 | */ |
524 | int tomoyo_write_pattern_policy(char *data, const bool is_delete) | |
525 | { | |
526 | return tomoyo_update_file_pattern_entry(data, is_delete); | |
527 | } | |
528 | ||
529 | /** | |
530 | * tomoyo_read_file_pattern - Read "struct tomoyo_pattern_entry" list. | |
531 | * | |
532 | * @head: Pointer to "struct tomoyo_io_buffer". | |
533 | * | |
534 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
535 | * |
536 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
537 | */ |
538 | bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head) | |
539 | { | |
540 | struct list_head *pos; | |
541 | bool done = true; | |
542 | ||
b69a54ee KT |
543 | list_for_each_cookie(pos, head->read_var2, &tomoyo_pattern_list) { |
544 | struct tomoyo_pattern_entry *ptr; | |
545 | ptr = list_entry(pos, struct tomoyo_pattern_entry, list); | |
546 | if (ptr->is_deleted) | |
547 | continue; | |
7d2948b1 TH |
548 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_FILE_PATTERN |
549 | "%s\n", ptr->pattern->name); | |
550 | if (!done) | |
b69a54ee | 551 | break; |
b69a54ee | 552 | } |
b69a54ee KT |
553 | return done; |
554 | } | |
555 | ||
c3fa109a TH |
556 | /* |
557 | * tomoyo_no_rewrite_list is used for holding list of pathnames which are by | |
558 | * default forbidden to modify already written content of a file. | |
559 | * | |
560 | * An entry is added by | |
561 | * | |
562 | * # echo 'deny_rewrite /var/log/messages' > \ | |
563 | * /sys/kernel/security/tomoyo/exception_policy | |
564 | * | |
565 | * and is deleted by | |
566 | * | |
567 | * # echo 'delete deny_rewrite /var/log/messages' > \ | |
568 | * /sys/kernel/security/tomoyo/exception_policy | |
569 | * | |
570 | * and all entries are retrieved by | |
571 | * | |
572 | * # grep ^deny_rewrite /sys/kernel/security/tomoyo/exception_policy | |
573 | * | |
574 | * In the example above, if a process requested to rewrite /var/log/messages , | |
575 | * the process can't rewrite unless the domain which that process belongs to | |
576 | * has "allow_rewrite /var/log/messages" entry. | |
577 | * | |
578 | * It is not a desirable behavior that we have to add "\040(deleted)" suffix | |
579 | * when we want to allow rewriting already unlink()ed file. As of now, | |
580 | * LSM version of TOMOYO is using __d_path() for calculating pathname. | |
581 | * Non LSM version of TOMOYO is using its own function which doesn't append | |
582 | * " (deleted)" suffix if the file is already unlink()ed; so that we don't | |
583 | * need to worry whether the file is already unlink()ed or not. | |
584 | */ | |
847b173e | 585 | LIST_HEAD(tomoyo_no_rewrite_list); |
b69a54ee KT |
586 | |
587 | /** | |
588 | * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list. | |
589 | * | |
590 | * @pattern: Pathname pattern that are not rewritable by default. | |
591 | * @is_delete: True if it is a delete request. | |
592 | * | |
593 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
594 | * |
595 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
596 | */ |
597 | static int tomoyo_update_no_rewrite_entry(const char *pattern, | |
598 | const bool is_delete) | |
599 | { | |
ca0b7df3 | 600 | struct tomoyo_no_rewrite_entry *ptr; |
9e4b50e9 | 601 | struct tomoyo_no_rewrite_entry e = { }; |
ca0b7df3 | 602 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 603 | |
17080008 | 604 | if (!tomoyo_is_correct_path(pattern, 0, 0, 0)) |
b69a54ee | 605 | return -EINVAL; |
9e4b50e9 TH |
606 | e.pattern = tomoyo_get_name(pattern); |
607 | if (!e.pattern) | |
ca0b7df3 | 608 | return error; |
29282381 TH |
609 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
610 | goto out; | |
fdb8ebb7 | 611 | list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { |
9e4b50e9 | 612 | if (ptr->pattern != e.pattern) |
b69a54ee KT |
613 | continue; |
614 | ptr->is_deleted = is_delete; | |
615 | error = 0; | |
ca0b7df3 | 616 | break; |
b69a54ee | 617 | } |
9e4b50e9 TH |
618 | if (!is_delete && error) { |
619 | struct tomoyo_no_rewrite_entry *entry = | |
620 | tomoyo_commit_ok(&e, sizeof(e)); | |
621 | if (entry) { | |
622 | list_add_tail_rcu(&entry->list, | |
623 | &tomoyo_no_rewrite_list); | |
624 | error = 0; | |
625 | } | |
b69a54ee | 626 | } |
f737d95d | 627 | mutex_unlock(&tomoyo_policy_lock); |
29282381 | 628 | out: |
9e4b50e9 | 629 | tomoyo_put_name(e.pattern); |
b69a54ee KT |
630 | return error; |
631 | } | |
632 | ||
633 | /** | |
634 | * tomoyo_is_no_rewrite_file - Check if the given pathname is not permitted to be rewrited. | |
635 | * | |
636 | * @filename: Filename to check. | |
637 | * | |
638 | * Returns true if @filename is specified by "deny_rewrite" directive, | |
639 | * false otherwise. | |
fdb8ebb7 TH |
640 | * |
641 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
642 | */ |
643 | static bool tomoyo_is_no_rewrite_file(const struct tomoyo_path_info *filename) | |
644 | { | |
645 | struct tomoyo_no_rewrite_entry *ptr; | |
646 | bool found = false; | |
647 | ||
fdb8ebb7 | 648 | list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { |
b69a54ee KT |
649 | if (ptr->is_deleted) |
650 | continue; | |
651 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
652 | continue; | |
653 | found = true; | |
654 | break; | |
655 | } | |
b69a54ee KT |
656 | return found; |
657 | } | |
658 | ||
659 | /** | |
660 | * tomoyo_write_no_rewrite_policy - Write "struct tomoyo_no_rewrite_entry" list. | |
661 | * | |
662 | * @data: String to parse. | |
663 | * @is_delete: True if it is a delete request. | |
664 | * | |
665 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
666 | * |
667 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
668 | */ |
669 | int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete) | |
670 | { | |
671 | return tomoyo_update_no_rewrite_entry(data, is_delete); | |
672 | } | |
673 | ||
674 | /** | |
675 | * tomoyo_read_no_rewrite_policy - Read "struct tomoyo_no_rewrite_entry" list. | |
676 | * | |
677 | * @head: Pointer to "struct tomoyo_io_buffer". | |
678 | * | |
679 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
680 | * |
681 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
682 | */ |
683 | bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head) | |
684 | { | |
685 | struct list_head *pos; | |
686 | bool done = true; | |
687 | ||
b69a54ee KT |
688 | list_for_each_cookie(pos, head->read_var2, &tomoyo_no_rewrite_list) { |
689 | struct tomoyo_no_rewrite_entry *ptr; | |
690 | ptr = list_entry(pos, struct tomoyo_no_rewrite_entry, list); | |
691 | if (ptr->is_deleted) | |
692 | continue; | |
7d2948b1 TH |
693 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_DENY_REWRITE |
694 | "%s\n", ptr->pattern->name); | |
695 | if (!done) | |
b69a54ee | 696 | break; |
b69a54ee | 697 | } |
b69a54ee KT |
698 | return done; |
699 | } | |
700 | ||
701 | /** | |
702 | * tomoyo_update_file_acl - Update file's read/write/execute ACL. | |
703 | * | |
b69a54ee | 704 | * @perm: Permission (between 1 to 7). |
a1f9bb6a | 705 | * @filename: Filename. |
b69a54ee KT |
706 | * @domain: Pointer to "struct tomoyo_domain_info". |
707 | * @is_delete: True if it is a delete request. | |
708 | * | |
709 | * Returns 0 on success, negative value otherwise. | |
710 | * | |
711 | * This is legacy support interface for older policy syntax. | |
712 | * Current policy syntax uses "allow_read/write" instead of "6", | |
713 | * "allow_read" instead of "4", "allow_write" instead of "2", | |
714 | * "allow_execute" instead of "1". | |
fdb8ebb7 TH |
715 | * |
716 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 717 | */ |
a1f9bb6a | 718 | static int tomoyo_update_file_acl(u8 perm, const char *filename, |
b69a54ee KT |
719 | struct tomoyo_domain_info * const domain, |
720 | const bool is_delete) | |
721 | { | |
722 | if (perm > 7 || !perm) { | |
723 | printk(KERN_DEBUG "%s: Invalid permission '%d %s'\n", | |
724 | __func__, perm, filename); | |
725 | return -EINVAL; | |
726 | } | |
727 | if (filename[0] != '@' && tomoyo_strendswith(filename, "/")) | |
728 | /* | |
729 | * Only 'allow_mkdir' and 'allow_rmdir' are valid for | |
730 | * directory permissions. | |
731 | */ | |
732 | return 0; | |
733 | if (perm & 4) | |
7ef61233 TH |
734 | tomoyo_update_path_acl(TOMOYO_TYPE_READ, filename, domain, |
735 | is_delete); | |
b69a54ee | 736 | if (perm & 2) |
7ef61233 TH |
737 | tomoyo_update_path_acl(TOMOYO_TYPE_WRITE, filename, domain, |
738 | is_delete); | |
b69a54ee | 739 | if (perm & 1) |
7ef61233 TH |
740 | tomoyo_update_path_acl(TOMOYO_TYPE_EXECUTE, filename, domain, |
741 | is_delete); | |
b69a54ee KT |
742 | return 0; |
743 | } | |
744 | ||
745 | /** | |
cb0abe6a | 746 | * tomoyo_path_acl - Check permission for single path operation. |
b69a54ee | 747 | * |
cb0abe6a | 748 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee KT |
749 | * @filename: Filename to check. |
750 | * @perm: Permission. | |
751 | * @may_use_pattern: True if patterned ACL is permitted. | |
752 | * | |
753 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
754 | * |
755 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 756 | */ |
cb0abe6a TH |
757 | static int tomoyo_path_acl(const struct tomoyo_request_info *r, |
758 | const struct tomoyo_path_info *filename, | |
759 | const u32 perm, const bool may_use_pattern) | |
b69a54ee | 760 | { |
cb0abe6a | 761 | struct tomoyo_domain_info *domain = r->domain; |
b69a54ee KT |
762 | struct tomoyo_acl_info *ptr; |
763 | int error = -EPERM; | |
764 | ||
fdb8ebb7 | 765 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
766 | struct tomoyo_path_acl *acl; |
767 | if (ptr->type != TOMOYO_TYPE_PATH_ACL) | |
b69a54ee | 768 | continue; |
7ef61233 | 769 | acl = container_of(ptr, struct tomoyo_path_acl, head); |
a1f9bb6a TH |
770 | if (!(acl->perm & perm) || |
771 | !tomoyo_compare_name_union_pattern(filename, &acl->name, | |
7762fbff | 772 | may_use_pattern)) |
b69a54ee | 773 | continue; |
b69a54ee KT |
774 | error = 0; |
775 | break; | |
776 | } | |
b69a54ee KT |
777 | return error; |
778 | } | |
779 | ||
780 | /** | |
cb0abe6a | 781 | * tomoyo_file_perm - Check permission for opening files. |
b69a54ee | 782 | * |
cb0abe6a | 783 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee | 784 | * @filename: Filename to check. |
cb0abe6a | 785 | * @mode: Mode ("read" or "write" or "read/write" or "execute"). |
b69a54ee KT |
786 | * |
787 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
788 | * |
789 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 790 | */ |
cb0abe6a TH |
791 | static int tomoyo_file_perm(struct tomoyo_request_info *r, |
792 | const struct tomoyo_path_info *filename, | |
793 | const u8 mode) | |
b69a54ee | 794 | { |
b69a54ee KT |
795 | const char *msg = "<unknown>"; |
796 | int error = 0; | |
cb0abe6a | 797 | u32 perm = 0; |
b69a54ee KT |
798 | |
799 | if (!filename) | |
800 | return 0; | |
cb0abe6a TH |
801 | |
802 | if (mode == 6) { | |
7ef61233 | 803 | msg = tomoyo_path2keyword(TOMOYO_TYPE_READ_WRITE); |
cb0abe6a TH |
804 | perm = 1 << TOMOYO_TYPE_READ_WRITE; |
805 | } else if (mode == 4) { | |
7ef61233 | 806 | msg = tomoyo_path2keyword(TOMOYO_TYPE_READ); |
cb0abe6a TH |
807 | perm = 1 << TOMOYO_TYPE_READ; |
808 | } else if (mode == 2) { | |
7ef61233 | 809 | msg = tomoyo_path2keyword(TOMOYO_TYPE_WRITE); |
cb0abe6a TH |
810 | perm = 1 << TOMOYO_TYPE_WRITE; |
811 | } else if (mode == 1) { | |
7ef61233 | 812 | msg = tomoyo_path2keyword(TOMOYO_TYPE_EXECUTE); |
cb0abe6a TH |
813 | perm = 1 << TOMOYO_TYPE_EXECUTE; |
814 | } else | |
b69a54ee | 815 | BUG(); |
cb0abe6a TH |
816 | error = tomoyo_path_acl(r, filename, perm, mode != 1); |
817 | if (error && mode == 4 && !r->domain->ignore_global_allow_read | |
818 | && tomoyo_is_globally_readable_file(filename)) | |
819 | error = 0; | |
b69a54ee KT |
820 | if (!error) |
821 | return 0; | |
cb0abe6a TH |
822 | tomoyo_warn_log(r, "%s %s", msg, filename->name); |
823 | if (r->mode == TOMOYO_CONFIG_ENFORCING) | |
b69a54ee | 824 | return error; |
cb0abe6a | 825 | if (tomoyo_domain_quota_is_ok(r)) { |
b69a54ee | 826 | /* Don't use patterns for execute permission. */ |
cb0abe6a | 827 | const struct tomoyo_path_info *patterned_file = (mode != 1) ? |
b69a54ee | 828 | tomoyo_get_file_pattern(filename) : filename; |
a1f9bb6a TH |
829 | tomoyo_update_file_acl(mode, patterned_file->name, r->domain, |
830 | false); | |
b69a54ee KT |
831 | } |
832 | return 0; | |
833 | } | |
834 | ||
b69a54ee | 835 | /** |
7ef61233 | 836 | * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list. |
b69a54ee KT |
837 | * |
838 | * @type: Type of operation. | |
839 | * @filename: Filename. | |
840 | * @domain: Pointer to "struct tomoyo_domain_info". | |
841 | * @is_delete: True if it is a delete request. | |
842 | * | |
843 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
844 | * |
845 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 846 | */ |
7ef61233 TH |
847 | static int tomoyo_update_path_acl(const u8 type, const char *filename, |
848 | struct tomoyo_domain_info *const domain, | |
849 | const bool is_delete) | |
b69a54ee | 850 | { |
a1f9bb6a | 851 | static const u16 tomoyo_rw_mask = |
7ef61233 | 852 | (1 << TOMOYO_TYPE_READ) | (1 << TOMOYO_TYPE_WRITE); |
a1f9bb6a | 853 | const u16 perm = 1 << type; |
b69a54ee | 854 | struct tomoyo_acl_info *ptr; |
9e4b50e9 TH |
855 | struct tomoyo_path_acl e = { |
856 | .head.type = TOMOYO_TYPE_PATH_ACL, | |
9e4b50e9 TH |
857 | .perm = perm |
858 | }; | |
ca0b7df3 | 859 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 860 | |
9e4b50e9 TH |
861 | if (type == TOMOYO_TYPE_READ_WRITE) |
862 | e.perm |= tomoyo_rw_mask; | |
b69a54ee KT |
863 | if (!domain) |
864 | return -EINVAL; | |
7762fbff | 865 | if (!tomoyo_parse_name_union(filename, &e.name)) |
b69a54ee | 866 | return -EINVAL; |
29282381 TH |
867 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
868 | goto out; | |
fdb8ebb7 | 869 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
870 | struct tomoyo_path_acl *acl = |
871 | container_of(ptr, struct tomoyo_path_acl, head); | |
7762fbff | 872 | if (!tomoyo_is_same_path_acl(acl, &e)) |
b69a54ee | 873 | continue; |
ca0b7df3 | 874 | if (is_delete) { |
a1f9bb6a | 875 | acl->perm &= ~perm; |
9e4b50e9 | 876 | if ((acl->perm & tomoyo_rw_mask) != tomoyo_rw_mask) |
7ef61233 TH |
877 | acl->perm &= ~(1 << TOMOYO_TYPE_READ_WRITE); |
878 | else if (!(acl->perm & (1 << TOMOYO_TYPE_READ_WRITE))) | |
9e4b50e9 | 879 | acl->perm &= ~tomoyo_rw_mask; |
ca0b7df3 | 880 | } else { |
a1f9bb6a | 881 | acl->perm |= perm; |
9e4b50e9 | 882 | if ((acl->perm & tomoyo_rw_mask) == tomoyo_rw_mask) |
7ef61233 TH |
883 | acl->perm |= 1 << TOMOYO_TYPE_READ_WRITE; |
884 | else if (acl->perm & (1 << TOMOYO_TYPE_READ_WRITE)) | |
9e4b50e9 | 885 | acl->perm |= tomoyo_rw_mask; |
ca0b7df3 | 886 | } |
b69a54ee | 887 | error = 0; |
ca0b7df3 | 888 | break; |
cd7bec6a | 889 | } |
9e4b50e9 TH |
890 | if (!is_delete && error) { |
891 | struct tomoyo_path_acl *entry = | |
892 | tomoyo_commit_ok(&e, sizeof(e)); | |
893 | if (entry) { | |
894 | list_add_tail_rcu(&entry->head.list, | |
895 | &domain->acl_info_list); | |
896 | error = 0; | |
897 | } | |
b69a54ee | 898 | } |
f737d95d | 899 | mutex_unlock(&tomoyo_policy_lock); |
29282381 | 900 | out: |
7762fbff | 901 | tomoyo_put_name_union(&e.name); |
b69a54ee KT |
902 | return error; |
903 | } | |
904 | ||
a1f9bb6a TH |
905 | /** |
906 | * tomoyo_update_path_number3_acl - Update "struct tomoyo_path_number3_acl" list. | |
907 | * | |
908 | * @type: Type of operation. | |
909 | * @filename: Filename. | |
910 | * @mode: Create mode. | |
911 | * @major: Device major number. | |
912 | * @minor: Device minor number. | |
913 | * @domain: Pointer to "struct tomoyo_domain_info". | |
914 | * @is_delete: True if it is a delete request. | |
915 | * | |
916 | * Returns 0 on success, negative value otherwise. | |
917 | */ | |
918 | static inline int tomoyo_update_path_number3_acl(const u8 type, | |
919 | const char *filename, | |
920 | char *mode, | |
921 | char *major, char *minor, | |
922 | struct tomoyo_domain_info * | |
923 | const domain, | |
924 | const bool is_delete) | |
925 | { | |
926 | const u8 perm = 1 << type; | |
927 | struct tomoyo_acl_info *ptr; | |
928 | struct tomoyo_path_number3_acl e = { | |
929 | .head.type = TOMOYO_TYPE_PATH_NUMBER3_ACL, | |
930 | .perm = perm | |
931 | }; | |
932 | int error = is_delete ? -ENOENT : -ENOMEM; | |
933 | if (!tomoyo_parse_name_union(filename, &e.name) || | |
934 | !tomoyo_parse_number_union(mode, &e.mode) || | |
935 | !tomoyo_parse_number_union(major, &e.major) || | |
936 | !tomoyo_parse_number_union(minor, &e.minor)) | |
937 | goto out; | |
938 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
939 | goto out; | |
940 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { | |
941 | struct tomoyo_path_number3_acl *acl = | |
942 | container_of(ptr, struct tomoyo_path_number3_acl, head); | |
943 | if (!tomoyo_is_same_path_number3_acl(acl, &e)) | |
944 | continue; | |
945 | if (is_delete) | |
946 | acl->perm &= ~perm; | |
947 | else | |
948 | acl->perm |= perm; | |
949 | error = 0; | |
950 | break; | |
951 | } | |
952 | if (!is_delete && error) { | |
953 | struct tomoyo_path_number3_acl *entry = | |
954 | tomoyo_commit_ok(&e, sizeof(e)); | |
955 | if (entry) { | |
956 | list_add_tail_rcu(&entry->head.list, | |
957 | &domain->acl_info_list); | |
958 | error = 0; | |
959 | } | |
960 | } | |
961 | mutex_unlock(&tomoyo_policy_lock); | |
962 | out: | |
963 | tomoyo_put_name_union(&e.name); | |
964 | tomoyo_put_number_union(&e.mode); | |
965 | tomoyo_put_number_union(&e.major); | |
966 | tomoyo_put_number_union(&e.minor); | |
967 | return error; | |
968 | } | |
969 | ||
b69a54ee | 970 | /** |
7ef61233 | 971 | * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list. |
b69a54ee KT |
972 | * |
973 | * @type: Type of operation. | |
974 | * @filename1: First filename. | |
975 | * @filename2: Second filename. | |
976 | * @domain: Pointer to "struct tomoyo_domain_info". | |
977 | * @is_delete: True if it is a delete request. | |
978 | * | |
979 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
980 | * |
981 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 982 | */ |
7ef61233 TH |
983 | static int tomoyo_update_path2_acl(const u8 type, const char *filename1, |
984 | const char *filename2, | |
985 | struct tomoyo_domain_info *const domain, | |
986 | const bool is_delete) | |
b69a54ee | 987 | { |
9e4b50e9 TH |
988 | const u8 perm = 1 << type; |
989 | struct tomoyo_path2_acl e = { | |
990 | .head.type = TOMOYO_TYPE_PATH2_ACL, | |
991 | .perm = perm | |
992 | }; | |
b69a54ee | 993 | struct tomoyo_acl_info *ptr; |
ca0b7df3 | 994 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee KT |
995 | |
996 | if (!domain) | |
997 | return -EINVAL; | |
7762fbff TH |
998 | if (!tomoyo_parse_name_union(filename1, &e.name1) || |
999 | !tomoyo_parse_name_union(filename2, &e.name2)) | |
ca0b7df3 | 1000 | goto out; |
29282381 TH |
1001 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
1002 | goto out; | |
fdb8ebb7 | 1003 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
1004 | struct tomoyo_path2_acl *acl = |
1005 | container_of(ptr, struct tomoyo_path2_acl, head); | |
7762fbff | 1006 | if (!tomoyo_is_same_path2_acl(acl, &e)) |
b69a54ee | 1007 | continue; |
ca0b7df3 TH |
1008 | if (is_delete) |
1009 | acl->perm &= ~perm; | |
1010 | else | |
1011 | acl->perm |= perm; | |
b69a54ee | 1012 | error = 0; |
ca0b7df3 | 1013 | break; |
cd7bec6a | 1014 | } |
9e4b50e9 TH |
1015 | if (!is_delete && error) { |
1016 | struct tomoyo_path2_acl *entry = | |
1017 | tomoyo_commit_ok(&e, sizeof(e)); | |
1018 | if (entry) { | |
1019 | list_add_tail_rcu(&entry->head.list, | |
1020 | &domain->acl_info_list); | |
1021 | error = 0; | |
1022 | } | |
b69a54ee | 1023 | } |
f737d95d | 1024 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 1025 | out: |
7762fbff TH |
1026 | tomoyo_put_name_union(&e.name1); |
1027 | tomoyo_put_name_union(&e.name2); | |
b69a54ee KT |
1028 | return error; |
1029 | } | |
1030 | ||
a1f9bb6a TH |
1031 | /** |
1032 | * tomoyo_path_number3_acl - Check permission for path/number/number/number operation. | |
1033 | * | |
1034 | * @r: Pointer to "struct tomoyo_request_info". | |
1035 | * @filename: Filename to check. | |
1036 | * @perm: Permission. | |
1037 | * @mode: Create mode. | |
1038 | * @major: Device major number. | |
1039 | * @minor: Device minor number. | |
1040 | * | |
1041 | * Returns 0 on success, -EPERM otherwise. | |
1042 | * | |
1043 | * Caller holds tomoyo_read_lock(). | |
1044 | */ | |
1045 | static int tomoyo_path_number3_acl(struct tomoyo_request_info *r, | |
1046 | const struct tomoyo_path_info *filename, | |
1047 | const u16 perm, const unsigned int mode, | |
1048 | const unsigned int major, | |
1049 | const unsigned int minor) | |
1050 | { | |
1051 | struct tomoyo_domain_info *domain = r->domain; | |
1052 | struct tomoyo_acl_info *ptr; | |
1053 | int error = -EPERM; | |
1054 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { | |
1055 | struct tomoyo_path_number3_acl *acl; | |
1056 | if (ptr->type != TOMOYO_TYPE_PATH_NUMBER3_ACL) | |
1057 | continue; | |
1058 | acl = container_of(ptr, struct tomoyo_path_number3_acl, head); | |
1059 | if (!tomoyo_compare_number_union(mode, &acl->mode)) | |
1060 | continue; | |
1061 | if (!tomoyo_compare_number_union(major, &acl->major)) | |
1062 | continue; | |
1063 | if (!tomoyo_compare_number_union(minor, &acl->minor)) | |
1064 | continue; | |
1065 | if (!(acl->perm & perm)) | |
1066 | continue; | |
1067 | if (!tomoyo_compare_name_union(filename, &acl->name)) | |
1068 | continue; | |
1069 | error = 0; | |
1070 | break; | |
1071 | } | |
1072 | return error; | |
1073 | } | |
1074 | ||
b69a54ee | 1075 | /** |
7ef61233 | 1076 | * tomoyo_path2_acl - Check permission for double path operation. |
b69a54ee | 1077 | * |
cb0abe6a | 1078 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee KT |
1079 | * @type: Type of operation. |
1080 | * @filename1: First filename to check. | |
1081 | * @filename2: Second filename to check. | |
1082 | * | |
1083 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
1084 | * |
1085 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 1086 | */ |
cb0abe6a | 1087 | static int tomoyo_path2_acl(const struct tomoyo_request_info *r, const u8 type, |
7ef61233 TH |
1088 | const struct tomoyo_path_info *filename1, |
1089 | const struct tomoyo_path_info *filename2) | |
b69a54ee | 1090 | { |
cb0abe6a | 1091 | const struct tomoyo_domain_info *domain = r->domain; |
b69a54ee KT |
1092 | struct tomoyo_acl_info *ptr; |
1093 | const u8 perm = 1 << type; | |
1094 | int error = -EPERM; | |
1095 | ||
fdb8ebb7 | 1096 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
1097 | struct tomoyo_path2_acl *acl; |
1098 | if (ptr->type != TOMOYO_TYPE_PATH2_ACL) | |
b69a54ee | 1099 | continue; |
7ef61233 | 1100 | acl = container_of(ptr, struct tomoyo_path2_acl, head); |
b69a54ee KT |
1101 | if (!(acl->perm & perm)) |
1102 | continue; | |
7762fbff | 1103 | if (!tomoyo_compare_name_union(filename1, &acl->name1)) |
b69a54ee | 1104 | continue; |
7762fbff | 1105 | if (!tomoyo_compare_name_union(filename2, &acl->name2)) |
b69a54ee KT |
1106 | continue; |
1107 | error = 0; | |
1108 | break; | |
1109 | } | |
b69a54ee KT |
1110 | return error; |
1111 | } | |
1112 | ||
1113 | /** | |
cb0abe6a | 1114 | * tomoyo_path_permission - Check permission for single path operation. |
b69a54ee | 1115 | * |
cb0abe6a | 1116 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee KT |
1117 | * @operation: Type of operation. |
1118 | * @filename: Filename to check. | |
b69a54ee KT |
1119 | * |
1120 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1121 | * |
1122 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 1123 | */ |
cb0abe6a TH |
1124 | static int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation, |
1125 | const struct tomoyo_path_info *filename) | |
b69a54ee | 1126 | { |
b69a54ee | 1127 | int error; |
b69a54ee | 1128 | |
b69a54ee | 1129 | next: |
cb0abe6a | 1130 | error = tomoyo_path_acl(r, filename, 1 << operation, 1); |
b69a54ee KT |
1131 | if (!error) |
1132 | goto ok; | |
cb0abe6a TH |
1133 | tomoyo_warn_log(r, "%s %s", tomoyo_path2keyword(operation), |
1134 | filename->name); | |
1135 | if (tomoyo_domain_quota_is_ok(r)) { | |
b69a54ee | 1136 | const char *name = tomoyo_get_file_pattern(filename)->name; |
cb0abe6a | 1137 | tomoyo_update_path_acl(operation, name, r->domain, false); |
b69a54ee | 1138 | } |
cb0abe6a | 1139 | if (r->mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1140 | error = 0; |
1141 | ok: | |
1142 | /* | |
1143 | * Since "allow_truncate" doesn't imply "allow_rewrite" permission, | |
1144 | * we need to check "allow_rewrite" permission if the filename is | |
1145 | * specified by "deny_rewrite" keyword. | |
1146 | */ | |
7ef61233 | 1147 | if (!error && operation == TOMOYO_TYPE_TRUNCATE && |
b69a54ee | 1148 | tomoyo_is_no_rewrite_file(filename)) { |
7ef61233 | 1149 | operation = TOMOYO_TYPE_REWRITE; |
b69a54ee KT |
1150 | goto next; |
1151 | } | |
1152 | return error; | |
1153 | } | |
1154 | ||
a1f9bb6a TH |
1155 | /** |
1156 | * tomoyo_path_number_acl - Check permission for ioctl/chmod/chown/chgrp operation. | |
1157 | * | |
1158 | * @r: Pointer to "struct tomoyo_request_info". | |
1159 | * @type: Operation. | |
1160 | * @filename: Filename to check. | |
1161 | * @number: Number. | |
1162 | * | |
1163 | * Returns 0 on success, -EPERM otherwise. | |
1164 | * | |
1165 | * Caller holds tomoyo_read_lock(). | |
1166 | */ | |
1167 | static int tomoyo_path_number_acl(struct tomoyo_request_info *r, const u8 type, | |
1168 | const struct tomoyo_path_info *filename, | |
1169 | const unsigned long number) | |
1170 | { | |
1171 | struct tomoyo_domain_info *domain = r->domain; | |
1172 | struct tomoyo_acl_info *ptr; | |
1173 | const u8 perm = 1 << type; | |
1174 | int error = -EPERM; | |
1175 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { | |
1176 | struct tomoyo_path_number_acl *acl; | |
1177 | if (ptr->type != TOMOYO_TYPE_PATH_NUMBER_ACL) | |
1178 | continue; | |
1179 | acl = container_of(ptr, struct tomoyo_path_number_acl, | |
1180 | head); | |
1181 | if (!(acl->perm & perm) || | |
1182 | !tomoyo_compare_number_union(number, &acl->number) || | |
1183 | !tomoyo_compare_name_union(filename, &acl->name)) | |
1184 | continue; | |
1185 | error = 0; | |
1186 | break; | |
1187 | } | |
1188 | return error; | |
1189 | } | |
1190 | ||
1191 | /** | |
1192 | * tomoyo_update_path_number_acl - Update ioctl/chmod/chown/chgrp ACL. | |
1193 | * | |
1194 | * @type: Type of operation. | |
1195 | * @filename: Filename. | |
1196 | * @number: Number. | |
1197 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1198 | * @is_delete: True if it is a delete request. | |
1199 | * | |
1200 | * Returns 0 on success, negative value otherwise. | |
1201 | */ | |
1202 | static inline int tomoyo_update_path_number_acl(const u8 type, | |
1203 | const char *filename, | |
1204 | char *number, | |
1205 | struct tomoyo_domain_info * | |
1206 | const domain, | |
1207 | const bool is_delete) | |
1208 | { | |
1209 | const u8 perm = 1 << type; | |
1210 | struct tomoyo_acl_info *ptr; | |
1211 | struct tomoyo_path_number_acl e = { | |
1212 | .head.type = TOMOYO_TYPE_PATH_NUMBER_ACL, | |
1213 | .perm = perm | |
1214 | }; | |
1215 | int error = is_delete ? -ENOENT : -ENOMEM; | |
1216 | if (!domain) | |
1217 | return -EINVAL; | |
1218 | if (!tomoyo_parse_name_union(filename, &e.name)) | |
1219 | return -EINVAL; | |
1220 | if (!tomoyo_parse_number_union(number, &e.number)) | |
1221 | goto out; | |
1222 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
1223 | goto out; | |
1224 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { | |
1225 | struct tomoyo_path_number_acl *acl = | |
1226 | container_of(ptr, struct tomoyo_path_number_acl, head); | |
1227 | if (!tomoyo_is_same_path_number_acl(acl, &e)) | |
1228 | continue; | |
1229 | if (is_delete) | |
1230 | acl->perm &= ~perm; | |
1231 | else | |
1232 | acl->perm |= perm; | |
1233 | error = 0; | |
1234 | break; | |
1235 | } | |
1236 | if (!is_delete && error) { | |
1237 | struct tomoyo_path_number_acl *entry = | |
1238 | tomoyo_commit_ok(&e, sizeof(e)); | |
1239 | if (entry) { | |
1240 | list_add_tail_rcu(&entry->head.list, | |
1241 | &domain->acl_info_list); | |
1242 | error = 0; | |
1243 | } | |
1244 | } | |
1245 | mutex_unlock(&tomoyo_policy_lock); | |
1246 | out: | |
1247 | tomoyo_put_name_union(&e.name); | |
1248 | tomoyo_put_number_union(&e.number); | |
1249 | return error; | |
1250 | } | |
1251 | ||
1252 | /** | |
1253 | * tomoyo_path_number_perm2 - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp". | |
1254 | * | |
1255 | * @r: Pointer to "strct tomoyo_request_info". | |
1256 | * @filename: Filename to check. | |
1257 | * @number: Number. | |
1258 | * | |
1259 | * Returns 0 on success, negative value otherwise. | |
1260 | * | |
1261 | * Caller holds tomoyo_read_lock(). | |
1262 | */ | |
1263 | static int tomoyo_path_number_perm2(struct tomoyo_request_info *r, | |
1264 | const u8 type, | |
1265 | const struct tomoyo_path_info *filename, | |
1266 | const unsigned long number) | |
1267 | { | |
1268 | char buffer[64]; | |
1269 | int error; | |
1270 | u8 radix; | |
1271 | ||
1272 | if (!filename) | |
1273 | return 0; | |
1274 | switch (type) { | |
1275 | case TOMOYO_TYPE_CREATE: | |
1276 | case TOMOYO_TYPE_MKDIR: | |
1277 | case TOMOYO_TYPE_MKFIFO: | |
1278 | case TOMOYO_TYPE_MKSOCK: | |
1279 | case TOMOYO_TYPE_CHMOD: | |
1280 | radix = TOMOYO_VALUE_TYPE_OCTAL; | |
1281 | break; | |
1282 | case TOMOYO_TYPE_IOCTL: | |
1283 | radix = TOMOYO_VALUE_TYPE_HEXADECIMAL; | |
1284 | break; | |
1285 | default: | |
1286 | radix = TOMOYO_VALUE_TYPE_DECIMAL; | |
1287 | break; | |
1288 | } | |
1289 | tomoyo_print_ulong(buffer, sizeof(buffer), number, radix); | |
1290 | error = tomoyo_path_number_acl(r, type, filename, number); | |
1291 | if (!error) | |
1292 | return 0; | |
1293 | tomoyo_warn_log(r, "%s %s %s", tomoyo_path_number2keyword(type), | |
1294 | filename->name, buffer); | |
1295 | if (tomoyo_domain_quota_is_ok(r)) | |
1296 | tomoyo_update_path_number_acl(type, | |
1297 | tomoyo_get_file_pattern(filename) | |
1298 | ->name, buffer, r->domain, false); | |
1299 | if (r->mode != TOMOYO_CONFIG_ENFORCING) | |
1300 | error = 0; | |
1301 | return error; | |
1302 | } | |
1303 | ||
1304 | /** | |
1305 | * tomoyo_path_number_perm - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp". | |
1306 | * | |
1307 | * @type: Type of operation. | |
1308 | * @path: Pointer to "struct path". | |
1309 | * @number: Number. | |
1310 | * | |
1311 | * Returns 0 on success, negative value otherwise. | |
1312 | */ | |
1313 | int tomoyo_path_number_perm(const u8 type, struct path *path, | |
1314 | unsigned long number) | |
1315 | { | |
1316 | struct tomoyo_request_info r; | |
1317 | int error = -ENOMEM; | |
1318 | struct tomoyo_path_info *buf; | |
1319 | int idx; | |
1320 | ||
1321 | if (tomoyo_init_request_info(&r, NULL) == TOMOYO_CONFIG_DISABLED || | |
1322 | !path->mnt || !path->dentry) | |
1323 | return 0; | |
1324 | idx = tomoyo_read_lock(); | |
1325 | buf = tomoyo_get_path(path); | |
1326 | if (!buf) | |
1327 | goto out; | |
1328 | if (type == TOMOYO_TYPE_MKDIR && !buf->is_dir) { | |
1329 | /* | |
1330 | * tomoyo_get_path() reserves space for appending "/." | |
1331 | */ | |
1332 | strcat((char *) buf->name, "/"); | |
1333 | tomoyo_fill_path_info(buf); | |
1334 | } | |
1335 | error = tomoyo_path_number_perm2(&r, type, buf, number); | |
1336 | out: | |
1337 | kfree(buf); | |
1338 | tomoyo_read_unlock(idx); | |
1339 | if (r.mode != TOMOYO_CONFIG_ENFORCING) | |
1340 | error = 0; | |
1341 | return error; | |
1342 | } | |
1343 | ||
b69a54ee KT |
1344 | /** |
1345 | * tomoyo_check_exec_perm - Check permission for "execute". | |
1346 | * | |
1347 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1348 | * @filename: Check permission for "execute". | |
b69a54ee KT |
1349 | * |
1350 | * Returns 0 on success, negativevalue otherwise. | |
fdb8ebb7 TH |
1351 | * |
1352 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
1353 | */ |
1354 | int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain, | |
bcb86975 | 1355 | const struct tomoyo_path_info *filename) |
b69a54ee | 1356 | { |
cb0abe6a | 1357 | struct tomoyo_request_info r; |
b69a54ee | 1358 | |
cb0abe6a | 1359 | if (tomoyo_init_request_info(&r, NULL) == TOMOYO_CONFIG_DISABLED) |
b69a54ee | 1360 | return 0; |
cb0abe6a | 1361 | return tomoyo_file_perm(&r, filename, 1); |
b69a54ee KT |
1362 | } |
1363 | ||
1364 | /** | |
1365 | * tomoyo_check_open_permission - Check permission for "read" and "write". | |
1366 | * | |
1367 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1368 | * @path: Pointer to "struct path". | |
1369 | * @flag: Flags for open(). | |
1370 | * | |
1371 | * Returns 0 on success, negative value otherwise. | |
1372 | */ | |
1373 | int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, | |
1374 | struct path *path, const int flag) | |
1375 | { | |
1376 | const u8 acc_mode = ACC_MODE(flag); | |
1377 | int error = -ENOMEM; | |
1378 | struct tomoyo_path_info *buf; | |
cb0abe6a | 1379 | struct tomoyo_request_info r; |
fdb8ebb7 | 1380 | int idx; |
b69a54ee | 1381 | |
cb0abe6a TH |
1382 | if (tomoyo_init_request_info(&r, domain) == TOMOYO_CONFIG_DISABLED || |
1383 | !path->mnt) | |
b69a54ee KT |
1384 | return 0; |
1385 | if (acc_mode == 0) | |
1386 | return 0; | |
1387 | if (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode)) | |
1388 | /* | |
1389 | * I don't check directories here because mkdir() and rmdir() | |
1390 | * don't call me. | |
1391 | */ | |
1392 | return 0; | |
fdb8ebb7 | 1393 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1394 | buf = tomoyo_get_path(path); |
1395 | if (!buf) | |
1396 | goto out; | |
1397 | error = 0; | |
1398 | /* | |
1399 | * If the filename is specified by "deny_rewrite" keyword, | |
1400 | * we need to check "allow_rewrite" permission when the filename is not | |
1401 | * opened for append mode or the filename is truncated at open time. | |
1402 | */ | |
1403 | if ((acc_mode & MAY_WRITE) && | |
1404 | ((flag & O_TRUNC) || !(flag & O_APPEND)) && | |
1405 | (tomoyo_is_no_rewrite_file(buf))) { | |
cb0abe6a | 1406 | error = tomoyo_path_permission(&r, TOMOYO_TYPE_REWRITE, buf); |
b69a54ee KT |
1407 | } |
1408 | if (!error) | |
cb0abe6a | 1409 | error = tomoyo_file_perm(&r, buf, acc_mode); |
b69a54ee | 1410 | if (!error && (flag & O_TRUNC)) |
cb0abe6a | 1411 | error = tomoyo_path_permission(&r, TOMOYO_TYPE_TRUNCATE, buf); |
b69a54ee | 1412 | out: |
8e2d39a1 | 1413 | kfree(buf); |
fdb8ebb7 | 1414 | tomoyo_read_unlock(idx); |
cb0abe6a | 1415 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1416 | error = 0; |
1417 | return error; | |
1418 | } | |
1419 | ||
1420 | /** | |
a1f9bb6a | 1421 | * tomoyo_path_perm - Check permission for "unlink", "rmdir", "truncate", "symlink", "rewrite", "chroot", "mount" and "unmount". |
b69a54ee | 1422 | * |
b69a54ee KT |
1423 | * @operation: Type of operation. |
1424 | * @path: Pointer to "struct path". | |
1425 | * | |
1426 | * Returns 0 on success, negative value otherwise. | |
1427 | */ | |
97d6931e | 1428 | int tomoyo_path_perm(const u8 operation, struct path *path) |
b69a54ee KT |
1429 | { |
1430 | int error = -ENOMEM; | |
1431 | struct tomoyo_path_info *buf; | |
cb0abe6a | 1432 | struct tomoyo_request_info r; |
fdb8ebb7 | 1433 | int idx; |
b69a54ee | 1434 | |
cb0abe6a TH |
1435 | if (tomoyo_init_request_info(&r, NULL) == TOMOYO_CONFIG_DISABLED || |
1436 | !path->mnt) | |
b69a54ee | 1437 | return 0; |
fdb8ebb7 | 1438 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1439 | buf = tomoyo_get_path(path); |
1440 | if (!buf) | |
1441 | goto out; | |
1442 | switch (operation) { | |
cb0abe6a TH |
1443 | case TOMOYO_TYPE_REWRITE: |
1444 | if (!tomoyo_is_no_rewrite_file(buf)) { | |
1445 | error = 0; | |
1446 | goto out; | |
1447 | } | |
1448 | break; | |
7ef61233 TH |
1449 | case TOMOYO_TYPE_RMDIR: |
1450 | case TOMOYO_TYPE_CHROOT: | |
b69a54ee KT |
1451 | if (!buf->is_dir) { |
1452 | /* | |
1453 | * tomoyo_get_path() reserves space for appending "/." | |
1454 | */ | |
1455 | strcat((char *) buf->name, "/"); | |
1456 | tomoyo_fill_path_info(buf); | |
1457 | } | |
1458 | } | |
cb0abe6a | 1459 | error = tomoyo_path_permission(&r, operation, buf); |
b69a54ee | 1460 | out: |
8e2d39a1 | 1461 | kfree(buf); |
fdb8ebb7 | 1462 | tomoyo_read_unlock(idx); |
cb0abe6a | 1463 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1464 | error = 0; |
1465 | return error; | |
1466 | } | |
1467 | ||
a1f9bb6a TH |
1468 | /** |
1469 | * tomoyo_path_number3_perm2 - Check permission for path/number/number/number operation. | |
1470 | * | |
1471 | * @r: Pointer to "struct tomoyo_request_info". | |
1472 | * @operation: Type of operation. | |
1473 | * @filename: Filename to check. | |
1474 | * @mode: Create mode. | |
1475 | * @dev: Device number. | |
1476 | * | |
1477 | * Returns 0 on success, negative value otherwise. | |
1478 | * | |
1479 | * Caller holds tomoyo_read_lock(). | |
1480 | */ | |
1481 | static int tomoyo_path_number3_perm2(struct tomoyo_request_info *r, | |
1482 | const u8 operation, | |
1483 | const struct tomoyo_path_info *filename, | |
1484 | const unsigned int mode, | |
1485 | const unsigned int dev) | |
1486 | { | |
1487 | int error; | |
1488 | const unsigned int major = MAJOR(dev); | |
1489 | const unsigned int minor = MINOR(dev); | |
1490 | ||
1491 | error = tomoyo_path_number3_acl(r, filename, 1 << operation, mode, | |
1492 | major, minor); | |
1493 | if (!error) | |
1494 | return 0; | |
1495 | tomoyo_warn_log(r, "%s %s 0%o %u %u", | |
1496 | tomoyo_path_number32keyword(operation), | |
1497 | filename->name, mode, major, minor); | |
1498 | if (tomoyo_domain_quota_is_ok(r)) { | |
1499 | char mode_buf[64]; | |
1500 | char major_buf[64]; | |
1501 | char minor_buf[64]; | |
1502 | memset(mode_buf, 0, sizeof(mode_buf)); | |
1503 | memset(major_buf, 0, sizeof(major_buf)); | |
1504 | memset(minor_buf, 0, sizeof(minor_buf)); | |
1505 | snprintf(mode_buf, sizeof(mode_buf) - 1, "0%o", mode); | |
1506 | snprintf(major_buf, sizeof(major_buf) - 1, "%u", major); | |
1507 | snprintf(minor_buf, sizeof(minor_buf) - 1, "%u", minor); | |
1508 | tomoyo_update_path_number3_acl(operation, | |
1509 | tomoyo_get_file_pattern(filename) | |
1510 | ->name, mode_buf, major_buf, | |
1511 | minor_buf, r->domain, false); | |
1512 | } | |
1513 | if (r->mode != TOMOYO_CONFIG_ENFORCING) | |
1514 | error = 0; | |
1515 | return error; | |
1516 | } | |
1517 | ||
1518 | /** | |
1519 | * tomoyo_path_number3_perm - Check permission for "mkblock" and "mkchar". | |
1520 | * | |
1521 | * @operation: Type of operation. (TOMOYO_TYPE_MKCHAR or TOMOYO_TYPE_MKBLOCK) | |
1522 | * @path: Pointer to "struct path". | |
1523 | * @mode: Create mode. | |
1524 | * @dev: Device number. | |
1525 | * | |
1526 | * Returns 0 on success, negative value otherwise. | |
1527 | */ | |
1528 | int tomoyo_path_number3_perm(const u8 operation, struct path *path, | |
1529 | const unsigned int mode, unsigned int dev) | |
1530 | { | |
1531 | struct tomoyo_request_info r; | |
1532 | int error = -ENOMEM; | |
1533 | struct tomoyo_path_info *buf; | |
1534 | int idx; | |
1535 | ||
1536 | if (tomoyo_init_request_info(&r, NULL) == TOMOYO_CONFIG_DISABLED || | |
1537 | !path->mnt) | |
1538 | return 0; | |
1539 | idx = tomoyo_read_lock(); | |
1540 | error = -ENOMEM; | |
1541 | buf = tomoyo_get_path(path); | |
1542 | if (buf) { | |
1543 | error = tomoyo_path_number3_perm2(&r, operation, buf, mode, | |
1544 | new_decode_dev(dev)); | |
1545 | kfree(buf); | |
1546 | } | |
1547 | tomoyo_read_unlock(idx); | |
1548 | if (r.mode != TOMOYO_CONFIG_ENFORCING) | |
1549 | error = 0; | |
1550 | return error; | |
1551 | } | |
1552 | ||
b69a54ee | 1553 | /** |
7ef61233 | 1554 | * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root". |
b69a54ee | 1555 | * |
b69a54ee KT |
1556 | * @operation: Type of operation. |
1557 | * @path1: Pointer to "struct path". | |
1558 | * @path2: Pointer to "struct path". | |
1559 | * | |
1560 | * Returns 0 on success, negative value otherwise. | |
1561 | */ | |
97d6931e | 1562 | int tomoyo_path2_perm(const u8 operation, struct path *path1, |
7ef61233 | 1563 | struct path *path2) |
b69a54ee KT |
1564 | { |
1565 | int error = -ENOMEM; | |
cb0abe6a TH |
1566 | struct tomoyo_path_info *buf1; |
1567 | struct tomoyo_path_info *buf2; | |
1568 | struct tomoyo_request_info r; | |
fdb8ebb7 | 1569 | int idx; |
b69a54ee | 1570 | |
cb0abe6a TH |
1571 | if (tomoyo_init_request_info(&r, NULL) == TOMOYO_CONFIG_DISABLED || |
1572 | !path1->mnt || !path2->mnt) | |
b69a54ee | 1573 | return 0; |
fdb8ebb7 | 1574 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1575 | buf1 = tomoyo_get_path(path1); |
1576 | buf2 = tomoyo_get_path(path2); | |
1577 | if (!buf1 || !buf2) | |
1578 | goto out; | |
1579 | { | |
1580 | struct dentry *dentry = path1->dentry; | |
1581 | if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) { | |
1582 | /* | |
1583 | * tomoyo_get_path() reserves space for appending "/." | |
1584 | */ | |
1585 | if (!buf1->is_dir) { | |
1586 | strcat((char *) buf1->name, "/"); | |
1587 | tomoyo_fill_path_info(buf1); | |
1588 | } | |
1589 | if (!buf2->is_dir) { | |
1590 | strcat((char *) buf2->name, "/"); | |
1591 | tomoyo_fill_path_info(buf2); | |
1592 | } | |
1593 | } | |
1594 | } | |
cb0abe6a | 1595 | error = tomoyo_path2_acl(&r, operation, buf1, buf2); |
b69a54ee KT |
1596 | if (!error) |
1597 | goto out; | |
cb0abe6a TH |
1598 | tomoyo_warn_log(&r, "%s %s %s", tomoyo_path22keyword(operation), |
1599 | buf1->name, buf2->name); | |
1600 | if (tomoyo_domain_quota_is_ok(&r)) { | |
b69a54ee KT |
1601 | const char *name1 = tomoyo_get_file_pattern(buf1)->name; |
1602 | const char *name2 = tomoyo_get_file_pattern(buf2)->name; | |
cb0abe6a | 1603 | tomoyo_update_path2_acl(operation, name1, name2, r.domain, |
7ef61233 | 1604 | false); |
b69a54ee KT |
1605 | } |
1606 | out: | |
8e2d39a1 TH |
1607 | kfree(buf1); |
1608 | kfree(buf2); | |
fdb8ebb7 | 1609 | tomoyo_read_unlock(idx); |
cb0abe6a | 1610 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1611 | error = 0; |
1612 | return error; | |
1613 | } | |
a1f9bb6a TH |
1614 | |
1615 | /** | |
1616 | * tomoyo_write_file_policy - Update file related list. | |
1617 | * | |
1618 | * @data: String to parse. | |
1619 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1620 | * @is_delete: True if it is a delete request. | |
1621 | * | |
1622 | * Returns 0 on success, negative value otherwise. | |
1623 | * | |
1624 | * Caller holds tomoyo_read_lock(). | |
1625 | */ | |
1626 | int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, | |
1627 | const bool is_delete) | |
1628 | { | |
1629 | char *w[5]; | |
1630 | u8 type; | |
1631 | if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0]) | |
1632 | return -EINVAL; | |
1633 | if (strncmp(w[0], "allow_", 6)) { | |
1634 | unsigned int perm; | |
1635 | if (sscanf(w[0], "%u", &perm) == 1) | |
1636 | return tomoyo_update_file_acl((u8) perm, w[1], domain, | |
1637 | is_delete); | |
1638 | goto out; | |
1639 | } | |
1640 | w[0] += 6; | |
1641 | for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) { | |
1642 | if (strcmp(w[0], tomoyo_path_keyword[type])) | |
1643 | continue; | |
1644 | return tomoyo_update_path_acl(type, w[1], domain, is_delete); | |
1645 | } | |
1646 | if (!w[2][0]) | |
1647 | goto out; | |
1648 | for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) { | |
1649 | if (strcmp(w[0], tomoyo_path2_keyword[type])) | |
1650 | continue; | |
1651 | return tomoyo_update_path2_acl(type, w[1], w[2], domain, | |
1652 | is_delete); | |
1653 | } | |
1654 | for (type = 0; type < TOMOYO_MAX_PATH_NUMBER_OPERATION; type++) { | |
1655 | if (strcmp(w[0], tomoyo_path_number_keyword[type])) | |
1656 | continue; | |
1657 | return tomoyo_update_path_number_acl(type, w[1], w[2], domain, | |
1658 | is_delete); | |
1659 | } | |
1660 | if (!w[3][0] || !w[4][0]) | |
1661 | goto out; | |
1662 | for (type = 0; type < TOMOYO_MAX_PATH_NUMBER3_OPERATION; type++) { | |
1663 | if (strcmp(w[0], tomoyo_path_number3_keyword[type])) | |
1664 | continue; | |
1665 | return tomoyo_update_path_number3_acl(type, w[1], w[2], w[3], | |
1666 | w[4], domain, is_delete); | |
1667 | } | |
1668 | out: | |
1669 | return -EINVAL; | |
1670 | } |