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 | 26 | [TOMOYO_TYPE_CHROOT] = "chroot", |
7ef61233 | 27 | [TOMOYO_TYPE_UMOUNT] = "unmount", |
b69a54ee KT |
28 | }; |
29 | ||
a1f9bb6a TH |
30 | /* Keyword array for operations with one pathname and three numbers. */ |
31 | static const char *tomoyo_path_number3_keyword | |
32 | [TOMOYO_MAX_PATH_NUMBER3_OPERATION] = { | |
33 | [TOMOYO_TYPE_MKBLOCK] = "mkblock", | |
34 | [TOMOYO_TYPE_MKCHAR] = "mkchar", | |
35 | }; | |
36 | ||
37 | /* Keyword array for operations with two pathnames. */ | |
7ef61233 | 38 | static const char *tomoyo_path2_keyword[TOMOYO_MAX_PATH2_OPERATION] = { |
a1f9bb6a TH |
39 | [TOMOYO_TYPE_LINK] = "link", |
40 | [TOMOYO_TYPE_RENAME] = "rename", | |
7ef61233 | 41 | [TOMOYO_TYPE_PIVOT_ROOT] = "pivot_root", |
b69a54ee KT |
42 | }; |
43 | ||
a1f9bb6a TH |
44 | /* Keyword array for operations with one pathname and one number. */ |
45 | static const char *tomoyo_path_number_keyword | |
46 | [TOMOYO_MAX_PATH_NUMBER_OPERATION] = { | |
47 | [TOMOYO_TYPE_CREATE] = "create", | |
48 | [TOMOYO_TYPE_MKDIR] = "mkdir", | |
49 | [TOMOYO_TYPE_MKFIFO] = "mkfifo", | |
50 | [TOMOYO_TYPE_MKSOCK] = "mksock", | |
51 | [TOMOYO_TYPE_IOCTL] = "ioctl", | |
52 | [TOMOYO_TYPE_CHMOD] = "chmod", | |
53 | [TOMOYO_TYPE_CHOWN] = "chown", | |
54 | [TOMOYO_TYPE_CHGRP] = "chgrp", | |
55 | }; | |
56 | ||
7762fbff TH |
57 | void tomoyo_put_name_union(struct tomoyo_name_union *ptr) |
58 | { | |
59 | if (!ptr) | |
60 | return; | |
61 | if (ptr->is_group) | |
62 | tomoyo_put_path_group(ptr->group); | |
63 | else | |
64 | tomoyo_put_name(ptr->filename); | |
65 | } | |
66 | ||
67 | bool tomoyo_compare_name_union(const struct tomoyo_path_info *name, | |
68 | const struct tomoyo_name_union *ptr) | |
69 | { | |
70 | if (ptr->is_group) | |
71 | return tomoyo_path_matches_group(name, ptr->group, 1); | |
72 | return tomoyo_path_matches_pattern(name, ptr->filename); | |
73 | } | |
74 | ||
75 | static bool tomoyo_compare_name_union_pattern(const struct tomoyo_path_info | |
76 | *name, | |
77 | const struct tomoyo_name_union | |
78 | *ptr, const bool may_use_pattern) | |
79 | { | |
80 | if (ptr->is_group) | |
81 | return tomoyo_path_matches_group(name, ptr->group, | |
82 | may_use_pattern); | |
83 | if (may_use_pattern || !ptr->filename->is_patterned) | |
84 | return tomoyo_path_matches_pattern(name, ptr->filename); | |
85 | return false; | |
86 | } | |
87 | ||
4c3e9e2d TH |
88 | void tomoyo_put_number_union(struct tomoyo_number_union *ptr) |
89 | { | |
90 | if (ptr && ptr->is_group) | |
91 | tomoyo_put_number_group(ptr->group); | |
92 | } | |
93 | ||
94 | bool tomoyo_compare_number_union(const unsigned long value, | |
95 | const struct tomoyo_number_union *ptr) | |
96 | { | |
97 | if (ptr->is_group) | |
98 | return tomoyo_number_matches_group(value, value, ptr->group); | |
99 | return value >= ptr->values[0] && value <= ptr->values[1]; | |
100 | } | |
101 | ||
cb0abe6a TH |
102 | /** |
103 | * tomoyo_init_request_info - Initialize "struct tomoyo_request_info" members. | |
104 | * | |
105 | * @r: Pointer to "struct tomoyo_request_info" to initialize. | |
106 | * @domain: Pointer to "struct tomoyo_domain_info". NULL for tomoyo_domain(). | |
107 | * | |
108 | * Returns mode. | |
109 | */ | |
2106ccd9 TH |
110 | int tomoyo_init_request_info(struct tomoyo_request_info *r, |
111 | struct tomoyo_domain_info *domain) | |
cb0abe6a TH |
112 | { |
113 | memset(r, 0, sizeof(*r)); | |
114 | if (!domain) | |
115 | domain = tomoyo_domain(); | |
116 | r->domain = domain; | |
117 | r->mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); | |
118 | return r->mode; | |
119 | } | |
120 | ||
121 | static void tomoyo_warn_log(struct tomoyo_request_info *r, const char *fmt, ...) | |
122 | __attribute__ ((format(printf, 2, 3))); | |
123 | /** | |
124 | * tomoyo_warn_log - Print warning or error message on console. | |
125 | * | |
126 | * @r: Pointer to "struct tomoyo_request_info". | |
127 | * @fmt: The printf()'s format string, followed by parameters. | |
128 | */ | |
129 | static void tomoyo_warn_log(struct tomoyo_request_info *r, const char *fmt, ...) | |
130 | { | |
131 | int len = PAGE_SIZE; | |
132 | va_list args; | |
133 | char *buffer; | |
134 | if (!tomoyo_verbose_mode(r->domain)) | |
135 | return; | |
136 | while (1) { | |
137 | int len2; | |
138 | buffer = kmalloc(len, GFP_NOFS); | |
139 | if (!buffer) | |
140 | return; | |
141 | va_start(args, fmt); | |
142 | len2 = vsnprintf(buffer, len - 1, fmt, args); | |
143 | va_end(args); | |
144 | if (len2 <= len - 1) { | |
145 | buffer[len2] = '\0'; | |
146 | break; | |
147 | } | |
148 | len = len2 + 1; | |
149 | kfree(buffer); | |
150 | } | |
151 | printk(KERN_WARNING "TOMOYO-%s: Access %s denied for %s\n", | |
152 | r->mode == TOMOYO_CONFIG_ENFORCING ? "ERROR" : "WARNING", | |
153 | buffer, tomoyo_get_last_name(r->domain)); | |
154 | kfree(buffer); | |
155 | } | |
156 | ||
b69a54ee | 157 | /** |
7ef61233 | 158 | * tomoyo_path2keyword - Get the name of single path operation. |
b69a54ee KT |
159 | * |
160 | * @operation: Type of operation. | |
161 | * | |
162 | * Returns the name of single path operation. | |
163 | */ | |
7ef61233 | 164 | const char *tomoyo_path2keyword(const u8 operation) |
b69a54ee | 165 | { |
7ef61233 TH |
166 | return (operation < TOMOYO_MAX_PATH_OPERATION) |
167 | ? tomoyo_path_keyword[operation] : NULL; | |
b69a54ee KT |
168 | } |
169 | ||
a1f9bb6a TH |
170 | /** |
171 | * tomoyo_path_number32keyword - Get the name of path/number/number/number operations. | |
172 | * | |
173 | * @operation: Type of operation. | |
174 | * | |
175 | * Returns the name of path/number/number/number operation. | |
176 | */ | |
177 | const char *tomoyo_path_number32keyword(const u8 operation) | |
178 | { | |
179 | return (operation < TOMOYO_MAX_PATH_NUMBER3_OPERATION) | |
180 | ? tomoyo_path_number3_keyword[operation] : NULL; | |
181 | } | |
182 | ||
b69a54ee | 183 | /** |
7ef61233 | 184 | * tomoyo_path22keyword - Get the name of double path operation. |
b69a54ee KT |
185 | * |
186 | * @operation: Type of operation. | |
187 | * | |
188 | * Returns the name of double path operation. | |
189 | */ | |
7ef61233 | 190 | const char *tomoyo_path22keyword(const u8 operation) |
b69a54ee | 191 | { |
7ef61233 TH |
192 | return (operation < TOMOYO_MAX_PATH2_OPERATION) |
193 | ? tomoyo_path2_keyword[operation] : NULL; | |
b69a54ee KT |
194 | } |
195 | ||
a1f9bb6a TH |
196 | /** |
197 | * tomoyo_path_number2keyword - Get the name of path/number operations. | |
198 | * | |
199 | * @operation: Type of operation. | |
200 | * | |
201 | * Returns the name of path/number operation. | |
202 | */ | |
203 | const char *tomoyo_path_number2keyword(const u8 operation) | |
204 | { | |
205 | return (operation < TOMOYO_MAX_PATH_NUMBER_OPERATION) | |
206 | ? tomoyo_path_number_keyword[operation] : NULL; | |
207 | } | |
208 | ||
b69a54ee KT |
209 | /** |
210 | * tomoyo_strendswith - Check whether the token ends with the given token. | |
211 | * | |
212 | * @name: The token to check. | |
213 | * @tail: The token to find. | |
214 | * | |
215 | * Returns true if @name ends with @tail, false otherwise. | |
216 | */ | |
217 | static bool tomoyo_strendswith(const char *name, const char *tail) | |
218 | { | |
219 | int len; | |
220 | ||
221 | if (!name || !tail) | |
222 | return false; | |
223 | len = strlen(name) - strlen(tail); | |
224 | return len >= 0 && !strcmp(name + len, tail); | |
225 | } | |
226 | ||
227 | /** | |
228 | * tomoyo_get_path - Get realpath. | |
229 | * | |
230 | * @path: Pointer to "struct path". | |
231 | * | |
232 | * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise. | |
233 | */ | |
234 | static struct tomoyo_path_info *tomoyo_get_path(struct path *path) | |
235 | { | |
236 | int error; | |
8e2d39a1 | 237 | struct tomoyo_path_info_with_data *buf = kzalloc(sizeof(*buf), |
4e5d6f7e | 238 | GFP_NOFS); |
b69a54ee KT |
239 | |
240 | if (!buf) | |
241 | return NULL; | |
242 | /* Reserve one byte for appending "/". */ | |
243 | error = tomoyo_realpath_from_path2(path, buf->body, | |
244 | sizeof(buf->body) - 2); | |
245 | if (!error) { | |
246 | buf->head.name = buf->body; | |
247 | tomoyo_fill_path_info(&buf->head); | |
248 | return &buf->head; | |
249 | } | |
8e2d39a1 | 250 | kfree(buf); |
b69a54ee KT |
251 | return NULL; |
252 | } | |
253 | ||
7ef61233 TH |
254 | static int tomoyo_update_path2_acl(const u8 type, const char *filename1, |
255 | const char *filename2, | |
256 | struct tomoyo_domain_info *const domain, | |
257 | const bool is_delete); | |
258 | static int tomoyo_update_path_acl(const u8 type, const char *filename, | |
259 | struct tomoyo_domain_info *const domain, | |
260 | const bool is_delete); | |
b69a54ee | 261 | |
c3fa109a TH |
262 | /* |
263 | * tomoyo_globally_readable_list is used for holding list of pathnames which | |
264 | * are by default allowed to be open()ed for reading by any process. | |
265 | * | |
266 | * An entry is added by | |
267 | * | |
268 | * # echo 'allow_read /lib/libc-2.5.so' > \ | |
269 | * /sys/kernel/security/tomoyo/exception_policy | |
270 | * | |
271 | * and is deleted by | |
272 | * | |
273 | * # echo 'delete allow_read /lib/libc-2.5.so' > \ | |
274 | * /sys/kernel/security/tomoyo/exception_policy | |
275 | * | |
276 | * and all entries are retrieved by | |
277 | * | |
278 | * # grep ^allow_read /sys/kernel/security/tomoyo/exception_policy | |
279 | * | |
280 | * In the example above, any process is allowed to | |
281 | * open("/lib/libc-2.5.so", O_RDONLY). | |
282 | * One exception is, if the domain which current process belongs to is marked | |
283 | * as "ignore_global_allow_read", current process can't do so unless explicitly | |
284 | * given "allow_read /lib/libc-2.5.so" to the domain which current process | |
285 | * belongs to. | |
286 | */ | |
847b173e | 287 | LIST_HEAD(tomoyo_globally_readable_list); |
b69a54ee KT |
288 | |
289 | /** | |
290 | * tomoyo_update_globally_readable_entry - Update "struct tomoyo_globally_readable_file_entry" list. | |
291 | * | |
292 | * @filename: Filename unconditionally permitted to open() for reading. | |
293 | * @is_delete: True if it is a delete request. | |
294 | * | |
295 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
296 | * |
297 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
298 | */ |
299 | static int tomoyo_update_globally_readable_entry(const char *filename, | |
300 | const bool is_delete) | |
301 | { | |
b69a54ee | 302 | struct tomoyo_globally_readable_file_entry *ptr; |
9e4b50e9 | 303 | struct tomoyo_globally_readable_file_entry e = { }; |
ca0b7df3 | 304 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 305 | |
17080008 | 306 | if (!tomoyo_is_correct_path(filename, 1, 0, -1)) |
b69a54ee | 307 | return -EINVAL; |
9e4b50e9 TH |
308 | e.filename = tomoyo_get_name(filename); |
309 | if (!e.filename) | |
b69a54ee | 310 | return -ENOMEM; |
29282381 TH |
311 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
312 | goto out; | |
fdb8ebb7 | 313 | list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { |
9e4b50e9 | 314 | if (ptr->filename != e.filename) |
b69a54ee KT |
315 | continue; |
316 | ptr->is_deleted = is_delete; | |
317 | error = 0; | |
ca0b7df3 | 318 | break; |
b69a54ee | 319 | } |
9e4b50e9 TH |
320 | if (!is_delete && error) { |
321 | struct tomoyo_globally_readable_file_entry *entry = | |
322 | tomoyo_commit_ok(&e, sizeof(e)); | |
323 | if (entry) { | |
324 | list_add_tail_rcu(&entry->list, | |
325 | &tomoyo_globally_readable_list); | |
326 | error = 0; | |
327 | } | |
b69a54ee | 328 | } |
f737d95d | 329 | mutex_unlock(&tomoyo_policy_lock); |
29282381 | 330 | out: |
9e4b50e9 | 331 | tomoyo_put_name(e.filename); |
b69a54ee KT |
332 | return error; |
333 | } | |
334 | ||
335 | /** | |
336 | * tomoyo_is_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading. | |
337 | * | |
338 | * @filename: The filename to check. | |
339 | * | |
340 | * Returns true if any domain can open @filename for reading, false otherwise. | |
fdb8ebb7 TH |
341 | * |
342 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
343 | */ |
344 | static bool tomoyo_is_globally_readable_file(const struct tomoyo_path_info * | |
345 | filename) | |
346 | { | |
347 | struct tomoyo_globally_readable_file_entry *ptr; | |
348 | bool found = false; | |
fdb8ebb7 TH |
349 | |
350 | list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { | |
b69a54ee KT |
351 | if (!ptr->is_deleted && |
352 | tomoyo_path_matches_pattern(filename, ptr->filename)) { | |
353 | found = true; | |
354 | break; | |
355 | } | |
356 | } | |
b69a54ee KT |
357 | return found; |
358 | } | |
359 | ||
360 | /** | |
361 | * tomoyo_write_globally_readable_policy - Write "struct tomoyo_globally_readable_file_entry" list. | |
362 | * | |
363 | * @data: String to parse. | |
364 | * @is_delete: True if it is a delete request. | |
365 | * | |
366 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
367 | * |
368 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
369 | */ |
370 | int tomoyo_write_globally_readable_policy(char *data, const bool is_delete) | |
371 | { | |
372 | return tomoyo_update_globally_readable_entry(data, is_delete); | |
373 | } | |
374 | ||
375 | /** | |
376 | * tomoyo_read_globally_readable_policy - Read "struct tomoyo_globally_readable_file_entry" list. | |
377 | * | |
378 | * @head: Pointer to "struct tomoyo_io_buffer". | |
379 | * | |
380 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
381 | * |
382 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
383 | */ |
384 | bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head) | |
385 | { | |
386 | struct list_head *pos; | |
387 | bool done = true; | |
388 | ||
b69a54ee KT |
389 | list_for_each_cookie(pos, head->read_var2, |
390 | &tomoyo_globally_readable_list) { | |
391 | struct tomoyo_globally_readable_file_entry *ptr; | |
392 | ptr = list_entry(pos, | |
393 | struct tomoyo_globally_readable_file_entry, | |
394 | list); | |
395 | if (ptr->is_deleted) | |
396 | continue; | |
7d2948b1 TH |
397 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_READ "%s\n", |
398 | ptr->filename->name); | |
399 | if (!done) | |
b69a54ee | 400 | break; |
b69a54ee | 401 | } |
b69a54ee KT |
402 | return done; |
403 | } | |
404 | ||
c3fa109a TH |
405 | /* tomoyo_pattern_list is used for holding list of pathnames which are used for |
406 | * converting pathnames to pathname patterns during learning mode. | |
407 | * | |
408 | * An entry is added by | |
409 | * | |
410 | * # echo 'file_pattern /proc/\$/mounts' > \ | |
411 | * /sys/kernel/security/tomoyo/exception_policy | |
412 | * | |
413 | * and is deleted by | |
414 | * | |
415 | * # echo 'delete file_pattern /proc/\$/mounts' > \ | |
416 | * /sys/kernel/security/tomoyo/exception_policy | |
417 | * | |
418 | * and all entries are retrieved by | |
419 | * | |
420 | * # grep ^file_pattern /sys/kernel/security/tomoyo/exception_policy | |
421 | * | |
422 | * In the example above, if a process which belongs to a domain which is in | |
423 | * learning mode requested open("/proc/1/mounts", O_RDONLY), | |
424 | * "allow_read /proc/\$/mounts" is automatically added to the domain which that | |
425 | * process belongs to. | |
426 | * | |
427 | * It is not a desirable behavior that we have to use /proc/\$/ instead of | |
428 | * /proc/self/ when current process needs to access only current process's | |
429 | * information. As of now, LSM version of TOMOYO is using __d_path() for | |
430 | * calculating pathname. Non LSM version of TOMOYO is using its own function | |
431 | * which pretends as if /proc/self/ is not a symlink; so that we can forbid | |
432 | * current process from accessing other process's information. | |
433 | */ | |
847b173e | 434 | LIST_HEAD(tomoyo_pattern_list); |
b69a54ee KT |
435 | |
436 | /** | |
437 | * tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list. | |
438 | * | |
439 | * @pattern: Pathname pattern. | |
440 | * @is_delete: True if it is a delete request. | |
441 | * | |
442 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
443 | * |
444 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
445 | */ |
446 | static int tomoyo_update_file_pattern_entry(const char *pattern, | |
447 | const bool is_delete) | |
448 | { | |
b69a54ee | 449 | struct tomoyo_pattern_entry *ptr; |
9e4b50e9 | 450 | struct tomoyo_pattern_entry e = { .pattern = tomoyo_get_name(pattern) }; |
ca0b7df3 | 451 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 452 | |
9e4b50e9 | 453 | if (!e.pattern) |
ca0b7df3 | 454 | return error; |
9e4b50e9 | 455 | if (!e.pattern->is_patterned) |
ca0b7df3 | 456 | goto out; |
29282381 TH |
457 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
458 | goto out; | |
fdb8ebb7 | 459 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { |
9e4b50e9 | 460 | if (e.pattern != ptr->pattern) |
b69a54ee KT |
461 | continue; |
462 | ptr->is_deleted = is_delete; | |
463 | error = 0; | |
ca0b7df3 | 464 | break; |
b69a54ee | 465 | } |
9e4b50e9 TH |
466 | if (!is_delete && error) { |
467 | struct tomoyo_pattern_entry *entry = | |
468 | tomoyo_commit_ok(&e, sizeof(e)); | |
469 | if (entry) { | |
470 | list_add_tail_rcu(&entry->list, &tomoyo_pattern_list); | |
471 | error = 0; | |
472 | } | |
b69a54ee | 473 | } |
f737d95d | 474 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 475 | out: |
9e4b50e9 | 476 | tomoyo_put_name(e.pattern); |
b69a54ee KT |
477 | return error; |
478 | } | |
479 | ||
480 | /** | |
17fcfbd9 | 481 | * tomoyo_file_pattern - Get patterned pathname. |
b69a54ee KT |
482 | * |
483 | * @filename: The filename to find patterned pathname. | |
484 | * | |
485 | * Returns pointer to pathname pattern if matched, @filename otherwise. | |
fdb8ebb7 TH |
486 | * |
487 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 488 | */ |
17fcfbd9 | 489 | const char *tomoyo_file_pattern(const struct tomoyo_path_info *filename) |
b69a54ee KT |
490 | { |
491 | struct tomoyo_pattern_entry *ptr; | |
492 | const struct tomoyo_path_info *pattern = NULL; | |
493 | ||
fdb8ebb7 | 494 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { |
b69a54ee KT |
495 | if (ptr->is_deleted) |
496 | continue; | |
497 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
498 | continue; | |
499 | pattern = ptr->pattern; | |
500 | if (tomoyo_strendswith(pattern->name, "/\\*")) { | |
501 | /* Do nothing. Try to find the better match. */ | |
502 | } else { | |
503 | /* This would be the better match. Use this. */ | |
504 | break; | |
505 | } | |
506 | } | |
b69a54ee KT |
507 | if (pattern) |
508 | filename = pattern; | |
17fcfbd9 | 509 | return filename->name; |
b69a54ee KT |
510 | } |
511 | ||
512 | /** | |
513 | * tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list. | |
514 | * | |
515 | * @data: String to parse. | |
516 | * @is_delete: True if it is a delete request. | |
517 | * | |
518 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
519 | * |
520 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
521 | */ |
522 | int tomoyo_write_pattern_policy(char *data, const bool is_delete) | |
523 | { | |
524 | return tomoyo_update_file_pattern_entry(data, is_delete); | |
525 | } | |
526 | ||
527 | /** | |
528 | * tomoyo_read_file_pattern - Read "struct tomoyo_pattern_entry" list. | |
529 | * | |
530 | * @head: Pointer to "struct tomoyo_io_buffer". | |
531 | * | |
532 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
533 | * |
534 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
535 | */ |
536 | bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head) | |
537 | { | |
538 | struct list_head *pos; | |
539 | bool done = true; | |
540 | ||
b69a54ee KT |
541 | list_for_each_cookie(pos, head->read_var2, &tomoyo_pattern_list) { |
542 | struct tomoyo_pattern_entry *ptr; | |
543 | ptr = list_entry(pos, struct tomoyo_pattern_entry, list); | |
544 | if (ptr->is_deleted) | |
545 | continue; | |
7d2948b1 TH |
546 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_FILE_PATTERN |
547 | "%s\n", ptr->pattern->name); | |
548 | if (!done) | |
b69a54ee | 549 | break; |
b69a54ee | 550 | } |
b69a54ee KT |
551 | return done; |
552 | } | |
553 | ||
c3fa109a TH |
554 | /* |
555 | * tomoyo_no_rewrite_list is used for holding list of pathnames which are by | |
556 | * default forbidden to modify already written content of a file. | |
557 | * | |
558 | * An entry is added by | |
559 | * | |
560 | * # echo 'deny_rewrite /var/log/messages' > \ | |
561 | * /sys/kernel/security/tomoyo/exception_policy | |
562 | * | |
563 | * and is deleted by | |
564 | * | |
565 | * # echo 'delete deny_rewrite /var/log/messages' > \ | |
566 | * /sys/kernel/security/tomoyo/exception_policy | |
567 | * | |
568 | * and all entries are retrieved by | |
569 | * | |
570 | * # grep ^deny_rewrite /sys/kernel/security/tomoyo/exception_policy | |
571 | * | |
572 | * In the example above, if a process requested to rewrite /var/log/messages , | |
573 | * the process can't rewrite unless the domain which that process belongs to | |
574 | * has "allow_rewrite /var/log/messages" entry. | |
575 | * | |
576 | * It is not a desirable behavior that we have to add "\040(deleted)" suffix | |
577 | * when we want to allow rewriting already unlink()ed file. As of now, | |
578 | * LSM version of TOMOYO is using __d_path() for calculating pathname. | |
579 | * Non LSM version of TOMOYO is using its own function which doesn't append | |
580 | * " (deleted)" suffix if the file is already unlink()ed; so that we don't | |
581 | * need to worry whether the file is already unlink()ed or not. | |
582 | */ | |
847b173e | 583 | LIST_HEAD(tomoyo_no_rewrite_list); |
b69a54ee KT |
584 | |
585 | /** | |
586 | * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list. | |
587 | * | |
588 | * @pattern: Pathname pattern that are not rewritable by default. | |
589 | * @is_delete: True if it is a delete request. | |
590 | * | |
591 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
592 | * |
593 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
594 | */ |
595 | static int tomoyo_update_no_rewrite_entry(const char *pattern, | |
596 | const bool is_delete) | |
597 | { | |
ca0b7df3 | 598 | struct tomoyo_no_rewrite_entry *ptr; |
9e4b50e9 | 599 | struct tomoyo_no_rewrite_entry e = { }; |
ca0b7df3 | 600 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 601 | |
17080008 | 602 | if (!tomoyo_is_correct_path(pattern, 0, 0, 0)) |
b69a54ee | 603 | return -EINVAL; |
9e4b50e9 TH |
604 | e.pattern = tomoyo_get_name(pattern); |
605 | if (!e.pattern) | |
ca0b7df3 | 606 | return error; |
29282381 TH |
607 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
608 | goto out; | |
fdb8ebb7 | 609 | list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { |
9e4b50e9 | 610 | if (ptr->pattern != e.pattern) |
b69a54ee KT |
611 | continue; |
612 | ptr->is_deleted = is_delete; | |
613 | error = 0; | |
ca0b7df3 | 614 | break; |
b69a54ee | 615 | } |
9e4b50e9 TH |
616 | if (!is_delete && error) { |
617 | struct tomoyo_no_rewrite_entry *entry = | |
618 | tomoyo_commit_ok(&e, sizeof(e)); | |
619 | if (entry) { | |
620 | list_add_tail_rcu(&entry->list, | |
621 | &tomoyo_no_rewrite_list); | |
622 | error = 0; | |
623 | } | |
b69a54ee | 624 | } |
f737d95d | 625 | mutex_unlock(&tomoyo_policy_lock); |
29282381 | 626 | out: |
9e4b50e9 | 627 | tomoyo_put_name(e.pattern); |
b69a54ee KT |
628 | return error; |
629 | } | |
630 | ||
631 | /** | |
632 | * tomoyo_is_no_rewrite_file - Check if the given pathname is not permitted to be rewrited. | |
633 | * | |
634 | * @filename: Filename to check. | |
635 | * | |
636 | * Returns true if @filename is specified by "deny_rewrite" directive, | |
637 | * false otherwise. | |
fdb8ebb7 TH |
638 | * |
639 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
640 | */ |
641 | static bool tomoyo_is_no_rewrite_file(const struct tomoyo_path_info *filename) | |
642 | { | |
643 | struct tomoyo_no_rewrite_entry *ptr; | |
644 | bool found = false; | |
645 | ||
fdb8ebb7 | 646 | list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { |
b69a54ee KT |
647 | if (ptr->is_deleted) |
648 | continue; | |
649 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
650 | continue; | |
651 | found = true; | |
652 | break; | |
653 | } | |
b69a54ee KT |
654 | return found; |
655 | } | |
656 | ||
657 | /** | |
658 | * tomoyo_write_no_rewrite_policy - Write "struct tomoyo_no_rewrite_entry" list. | |
659 | * | |
660 | * @data: String to parse. | |
661 | * @is_delete: True if it is a delete request. | |
662 | * | |
663 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
664 | * |
665 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
666 | */ |
667 | int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete) | |
668 | { | |
669 | return tomoyo_update_no_rewrite_entry(data, is_delete); | |
670 | } | |
671 | ||
672 | /** | |
673 | * tomoyo_read_no_rewrite_policy - Read "struct tomoyo_no_rewrite_entry" list. | |
674 | * | |
675 | * @head: Pointer to "struct tomoyo_io_buffer". | |
676 | * | |
677 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
678 | * |
679 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
680 | */ |
681 | bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head) | |
682 | { | |
683 | struct list_head *pos; | |
684 | bool done = true; | |
685 | ||
b69a54ee KT |
686 | list_for_each_cookie(pos, head->read_var2, &tomoyo_no_rewrite_list) { |
687 | struct tomoyo_no_rewrite_entry *ptr; | |
688 | ptr = list_entry(pos, struct tomoyo_no_rewrite_entry, list); | |
689 | if (ptr->is_deleted) | |
690 | continue; | |
7d2948b1 TH |
691 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_DENY_REWRITE |
692 | "%s\n", ptr->pattern->name); | |
693 | if (!done) | |
b69a54ee | 694 | break; |
b69a54ee | 695 | } |
b69a54ee KT |
696 | return done; |
697 | } | |
698 | ||
699 | /** | |
700 | * tomoyo_update_file_acl - Update file's read/write/execute ACL. | |
701 | * | |
b69a54ee | 702 | * @perm: Permission (between 1 to 7). |
a1f9bb6a | 703 | * @filename: Filename. |
b69a54ee KT |
704 | * @domain: Pointer to "struct tomoyo_domain_info". |
705 | * @is_delete: True if it is a delete request. | |
706 | * | |
707 | * Returns 0 on success, negative value otherwise. | |
708 | * | |
709 | * This is legacy support interface for older policy syntax. | |
710 | * Current policy syntax uses "allow_read/write" instead of "6", | |
711 | * "allow_read" instead of "4", "allow_write" instead of "2", | |
712 | * "allow_execute" instead of "1". | |
fdb8ebb7 TH |
713 | * |
714 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 715 | */ |
a1f9bb6a | 716 | static int tomoyo_update_file_acl(u8 perm, const char *filename, |
b69a54ee KT |
717 | struct tomoyo_domain_info * const domain, |
718 | const bool is_delete) | |
719 | { | |
720 | if (perm > 7 || !perm) { | |
721 | printk(KERN_DEBUG "%s: Invalid permission '%d %s'\n", | |
722 | __func__, perm, filename); | |
723 | return -EINVAL; | |
724 | } | |
725 | if (filename[0] != '@' && tomoyo_strendswith(filename, "/")) | |
726 | /* | |
727 | * Only 'allow_mkdir' and 'allow_rmdir' are valid for | |
728 | * directory permissions. | |
729 | */ | |
730 | return 0; | |
731 | if (perm & 4) | |
7ef61233 TH |
732 | tomoyo_update_path_acl(TOMOYO_TYPE_READ, filename, domain, |
733 | is_delete); | |
b69a54ee | 734 | if (perm & 2) |
7ef61233 TH |
735 | tomoyo_update_path_acl(TOMOYO_TYPE_WRITE, filename, domain, |
736 | is_delete); | |
b69a54ee | 737 | if (perm & 1) |
7ef61233 TH |
738 | tomoyo_update_path_acl(TOMOYO_TYPE_EXECUTE, filename, domain, |
739 | is_delete); | |
b69a54ee KT |
740 | return 0; |
741 | } | |
742 | ||
743 | /** | |
cb0abe6a | 744 | * tomoyo_path_acl - Check permission for single path operation. |
b69a54ee | 745 | * |
cb0abe6a | 746 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee KT |
747 | * @filename: Filename to check. |
748 | * @perm: Permission. | |
749 | * @may_use_pattern: True if patterned ACL is permitted. | |
750 | * | |
751 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
752 | * |
753 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 754 | */ |
cb0abe6a TH |
755 | static int tomoyo_path_acl(const struct tomoyo_request_info *r, |
756 | const struct tomoyo_path_info *filename, | |
757 | const u32 perm, const bool may_use_pattern) | |
b69a54ee | 758 | { |
cb0abe6a | 759 | struct tomoyo_domain_info *domain = r->domain; |
b69a54ee KT |
760 | struct tomoyo_acl_info *ptr; |
761 | int error = -EPERM; | |
762 | ||
fdb8ebb7 | 763 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
764 | struct tomoyo_path_acl *acl; |
765 | if (ptr->type != TOMOYO_TYPE_PATH_ACL) | |
b69a54ee | 766 | continue; |
7ef61233 | 767 | acl = container_of(ptr, struct tomoyo_path_acl, head); |
a1f9bb6a TH |
768 | if (!(acl->perm & perm) || |
769 | !tomoyo_compare_name_union_pattern(filename, &acl->name, | |
7762fbff | 770 | may_use_pattern)) |
b69a54ee | 771 | continue; |
b69a54ee KT |
772 | error = 0; |
773 | break; | |
774 | } | |
b69a54ee KT |
775 | return error; |
776 | } | |
777 | ||
778 | /** | |
cb0abe6a | 779 | * tomoyo_file_perm - Check permission for opening files. |
b69a54ee | 780 | * |
cb0abe6a | 781 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee | 782 | * @filename: Filename to check. |
cb0abe6a | 783 | * @mode: Mode ("read" or "write" or "read/write" or "execute"). |
b69a54ee KT |
784 | * |
785 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
786 | * |
787 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 788 | */ |
cb0abe6a TH |
789 | static int tomoyo_file_perm(struct tomoyo_request_info *r, |
790 | const struct tomoyo_path_info *filename, | |
791 | const u8 mode) | |
b69a54ee | 792 | { |
b69a54ee KT |
793 | const char *msg = "<unknown>"; |
794 | int error = 0; | |
cb0abe6a | 795 | u32 perm = 0; |
b69a54ee KT |
796 | |
797 | if (!filename) | |
798 | return 0; | |
cb0abe6a TH |
799 | |
800 | if (mode == 6) { | |
7ef61233 | 801 | msg = tomoyo_path2keyword(TOMOYO_TYPE_READ_WRITE); |
cb0abe6a TH |
802 | perm = 1 << TOMOYO_TYPE_READ_WRITE; |
803 | } else if (mode == 4) { | |
7ef61233 | 804 | msg = tomoyo_path2keyword(TOMOYO_TYPE_READ); |
cb0abe6a TH |
805 | perm = 1 << TOMOYO_TYPE_READ; |
806 | } else if (mode == 2) { | |
7ef61233 | 807 | msg = tomoyo_path2keyword(TOMOYO_TYPE_WRITE); |
cb0abe6a TH |
808 | perm = 1 << TOMOYO_TYPE_WRITE; |
809 | } else if (mode == 1) { | |
7ef61233 | 810 | msg = tomoyo_path2keyword(TOMOYO_TYPE_EXECUTE); |
cb0abe6a TH |
811 | perm = 1 << TOMOYO_TYPE_EXECUTE; |
812 | } else | |
b69a54ee | 813 | BUG(); |
17fcfbd9 TH |
814 | do { |
815 | error = tomoyo_path_acl(r, filename, perm, mode != 1); | |
816 | if (error && mode == 4 && !r->domain->ignore_global_allow_read | |
817 | && tomoyo_is_globally_readable_file(filename)) | |
818 | error = 0; | |
819 | if (!error) | |
820 | break; | |
821 | tomoyo_warn_log(r, "%s %s", msg, filename->name); | |
822 | error = tomoyo_supervisor(r, "allow_%s %s\n", msg, | |
823 | mode == 1 ? filename->name : | |
824 | tomoyo_file_pattern(filename)); | |
825 | /* | |
826 | * Do not retry for execute request, for alias may have | |
827 | * changed. | |
828 | */ | |
829 | } while (error == TOMOYO_RETRY_REQUEST && mode != 1); | |
830 | if (r->mode != TOMOYO_CONFIG_ENFORCING) | |
cb0abe6a | 831 | error = 0; |
17fcfbd9 | 832 | return error; |
b69a54ee KT |
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 | { |
17fcfbd9 | 1127 | const char *msg; |
b69a54ee | 1128 | int error; |
b69a54ee | 1129 | |
b69a54ee | 1130 | next: |
17fcfbd9 TH |
1131 | do { |
1132 | error = tomoyo_path_acl(r, filename, 1 << operation, 1); | |
1133 | if (!error) | |
1134 | break; | |
1135 | msg = tomoyo_path2keyword(operation); | |
1136 | tomoyo_warn_log(r, "%s %s", msg, filename->name); | |
1137 | error = tomoyo_supervisor(r, "allow_%s %s\n", msg, | |
1138 | tomoyo_file_pattern(filename)); | |
1139 | } while (error == TOMOYO_RETRY_REQUEST); | |
cb0abe6a | 1140 | if (r->mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee | 1141 | error = 0; |
b69a54ee KT |
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; | |
17fcfbd9 | 1271 | const char *msg; |
a1f9bb6a TH |
1272 | |
1273 | if (!filename) | |
1274 | return 0; | |
1275 | switch (type) { | |
1276 | case TOMOYO_TYPE_CREATE: | |
1277 | case TOMOYO_TYPE_MKDIR: | |
1278 | case TOMOYO_TYPE_MKFIFO: | |
1279 | case TOMOYO_TYPE_MKSOCK: | |
1280 | case TOMOYO_TYPE_CHMOD: | |
1281 | radix = TOMOYO_VALUE_TYPE_OCTAL; | |
1282 | break; | |
1283 | case TOMOYO_TYPE_IOCTL: | |
1284 | radix = TOMOYO_VALUE_TYPE_HEXADECIMAL; | |
1285 | break; | |
1286 | default: | |
1287 | radix = TOMOYO_VALUE_TYPE_DECIMAL; | |
1288 | break; | |
1289 | } | |
1290 | tomoyo_print_ulong(buffer, sizeof(buffer), number, radix); | |
17fcfbd9 TH |
1291 | do { |
1292 | error = tomoyo_path_number_acl(r, type, filename, number); | |
1293 | if (!error) | |
1294 | break; | |
1295 | msg = tomoyo_path_number2keyword(type); | |
1296 | tomoyo_warn_log(r, "%s %s %s", msg, filename->name, buffer); | |
1297 | error = tomoyo_supervisor(r, "allow_%s %s %s\n", msg, | |
1298 | tomoyo_file_pattern(filename), | |
1299 | buffer); | |
1300 | } while (error == TOMOYO_RETRY_REQUEST); | |
a1f9bb6a TH |
1301 | if (r->mode != TOMOYO_CONFIG_ENFORCING) |
1302 | error = 0; | |
1303 | return error; | |
1304 | } | |
1305 | ||
1306 | /** | |
1307 | * tomoyo_path_number_perm - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp". | |
1308 | * | |
1309 | * @type: Type of operation. | |
1310 | * @path: Pointer to "struct path". | |
1311 | * @number: Number. | |
1312 | * | |
1313 | * Returns 0 on success, negative value otherwise. | |
1314 | */ | |
1315 | int tomoyo_path_number_perm(const u8 type, struct path *path, | |
1316 | unsigned long number) | |
1317 | { | |
1318 | struct tomoyo_request_info r; | |
1319 | int error = -ENOMEM; | |
1320 | struct tomoyo_path_info *buf; | |
1321 | int idx; | |
1322 | ||
1323 | if (tomoyo_init_request_info(&r, NULL) == TOMOYO_CONFIG_DISABLED || | |
1324 | !path->mnt || !path->dentry) | |
1325 | return 0; | |
1326 | idx = tomoyo_read_lock(); | |
1327 | buf = tomoyo_get_path(path); | |
1328 | if (!buf) | |
1329 | goto out; | |
1330 | if (type == TOMOYO_TYPE_MKDIR && !buf->is_dir) { | |
1331 | /* | |
1332 | * tomoyo_get_path() reserves space for appending "/." | |
1333 | */ | |
1334 | strcat((char *) buf->name, "/"); | |
1335 | tomoyo_fill_path_info(buf); | |
1336 | } | |
1337 | error = tomoyo_path_number_perm2(&r, type, buf, number); | |
1338 | out: | |
1339 | kfree(buf); | |
1340 | tomoyo_read_unlock(idx); | |
1341 | if (r.mode != TOMOYO_CONFIG_ENFORCING) | |
1342 | error = 0; | |
1343 | return error; | |
1344 | } | |
1345 | ||
b69a54ee KT |
1346 | /** |
1347 | * tomoyo_check_exec_perm - Check permission for "execute". | |
1348 | * | |
1349 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1350 | * @filename: Check permission for "execute". | |
b69a54ee KT |
1351 | * |
1352 | * Returns 0 on success, negativevalue otherwise. | |
fdb8ebb7 TH |
1353 | * |
1354 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
1355 | */ |
1356 | int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain, | |
bcb86975 | 1357 | const struct tomoyo_path_info *filename) |
b69a54ee | 1358 | { |
cb0abe6a | 1359 | struct tomoyo_request_info r; |
b69a54ee | 1360 | |
cb0abe6a | 1361 | if (tomoyo_init_request_info(&r, NULL) == TOMOYO_CONFIG_DISABLED) |
b69a54ee | 1362 | return 0; |
cb0abe6a | 1363 | return tomoyo_file_perm(&r, filename, 1); |
b69a54ee KT |
1364 | } |
1365 | ||
1366 | /** | |
1367 | * tomoyo_check_open_permission - Check permission for "read" and "write". | |
1368 | * | |
1369 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1370 | * @path: Pointer to "struct path". | |
1371 | * @flag: Flags for open(). | |
1372 | * | |
1373 | * Returns 0 on success, negative value otherwise. | |
1374 | */ | |
1375 | int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, | |
1376 | struct path *path, const int flag) | |
1377 | { | |
1378 | const u8 acc_mode = ACC_MODE(flag); | |
1379 | int error = -ENOMEM; | |
1380 | struct tomoyo_path_info *buf; | |
cb0abe6a | 1381 | struct tomoyo_request_info r; |
fdb8ebb7 | 1382 | int idx; |
b69a54ee | 1383 | |
cb0abe6a TH |
1384 | if (tomoyo_init_request_info(&r, domain) == TOMOYO_CONFIG_DISABLED || |
1385 | !path->mnt) | |
b69a54ee KT |
1386 | return 0; |
1387 | if (acc_mode == 0) | |
1388 | return 0; | |
1389 | if (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode)) | |
1390 | /* | |
1391 | * I don't check directories here because mkdir() and rmdir() | |
1392 | * don't call me. | |
1393 | */ | |
1394 | return 0; | |
fdb8ebb7 | 1395 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1396 | buf = tomoyo_get_path(path); |
1397 | if (!buf) | |
1398 | goto out; | |
1399 | error = 0; | |
1400 | /* | |
1401 | * If the filename is specified by "deny_rewrite" keyword, | |
1402 | * we need to check "allow_rewrite" permission when the filename is not | |
1403 | * opened for append mode or the filename is truncated at open time. | |
1404 | */ | |
1405 | if ((acc_mode & MAY_WRITE) && | |
1406 | ((flag & O_TRUNC) || !(flag & O_APPEND)) && | |
1407 | (tomoyo_is_no_rewrite_file(buf))) { | |
cb0abe6a | 1408 | error = tomoyo_path_permission(&r, TOMOYO_TYPE_REWRITE, buf); |
b69a54ee KT |
1409 | } |
1410 | if (!error) | |
cb0abe6a | 1411 | error = tomoyo_file_perm(&r, buf, acc_mode); |
b69a54ee | 1412 | if (!error && (flag & O_TRUNC)) |
cb0abe6a | 1413 | error = tomoyo_path_permission(&r, TOMOYO_TYPE_TRUNCATE, buf); |
b69a54ee | 1414 | out: |
8e2d39a1 | 1415 | kfree(buf); |
fdb8ebb7 | 1416 | tomoyo_read_unlock(idx); |
cb0abe6a | 1417 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1418 | error = 0; |
1419 | return error; | |
1420 | } | |
1421 | ||
1422 | /** | |
2106ccd9 | 1423 | * tomoyo_path_perm - Check permission for "unlink", "rmdir", "truncate", "symlink", "rewrite", "chroot" and "unmount". |
b69a54ee | 1424 | * |
b69a54ee KT |
1425 | * @operation: Type of operation. |
1426 | * @path: Pointer to "struct path". | |
1427 | * | |
1428 | * Returns 0 on success, negative value otherwise. | |
1429 | */ | |
97d6931e | 1430 | int tomoyo_path_perm(const u8 operation, struct path *path) |
b69a54ee KT |
1431 | { |
1432 | int error = -ENOMEM; | |
1433 | struct tomoyo_path_info *buf; | |
cb0abe6a | 1434 | struct tomoyo_request_info r; |
fdb8ebb7 | 1435 | int idx; |
b69a54ee | 1436 | |
cb0abe6a TH |
1437 | if (tomoyo_init_request_info(&r, NULL) == TOMOYO_CONFIG_DISABLED || |
1438 | !path->mnt) | |
b69a54ee | 1439 | return 0; |
fdb8ebb7 | 1440 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1441 | buf = tomoyo_get_path(path); |
1442 | if (!buf) | |
1443 | goto out; | |
1444 | switch (operation) { | |
cb0abe6a TH |
1445 | case TOMOYO_TYPE_REWRITE: |
1446 | if (!tomoyo_is_no_rewrite_file(buf)) { | |
1447 | error = 0; | |
1448 | goto out; | |
1449 | } | |
1450 | break; | |
7ef61233 TH |
1451 | case TOMOYO_TYPE_RMDIR: |
1452 | case TOMOYO_TYPE_CHROOT: | |
b69a54ee KT |
1453 | if (!buf->is_dir) { |
1454 | /* | |
1455 | * tomoyo_get_path() reserves space for appending "/." | |
1456 | */ | |
1457 | strcat((char *) buf->name, "/"); | |
1458 | tomoyo_fill_path_info(buf); | |
1459 | } | |
1460 | } | |
cb0abe6a | 1461 | error = tomoyo_path_permission(&r, operation, buf); |
b69a54ee | 1462 | out: |
8e2d39a1 | 1463 | kfree(buf); |
fdb8ebb7 | 1464 | tomoyo_read_unlock(idx); |
cb0abe6a | 1465 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1466 | error = 0; |
1467 | return error; | |
1468 | } | |
1469 | ||
a1f9bb6a TH |
1470 | /** |
1471 | * tomoyo_path_number3_perm2 - Check permission for path/number/number/number operation. | |
1472 | * | |
1473 | * @r: Pointer to "struct tomoyo_request_info". | |
1474 | * @operation: Type of operation. | |
1475 | * @filename: Filename to check. | |
1476 | * @mode: Create mode. | |
1477 | * @dev: Device number. | |
1478 | * | |
1479 | * Returns 0 on success, negative value otherwise. | |
1480 | * | |
1481 | * Caller holds tomoyo_read_lock(). | |
1482 | */ | |
1483 | static int tomoyo_path_number3_perm2(struct tomoyo_request_info *r, | |
1484 | const u8 operation, | |
1485 | const struct tomoyo_path_info *filename, | |
1486 | const unsigned int mode, | |
1487 | const unsigned int dev) | |
1488 | { | |
1489 | int error; | |
17fcfbd9 | 1490 | const char *msg; |
a1f9bb6a TH |
1491 | const unsigned int major = MAJOR(dev); |
1492 | const unsigned int minor = MINOR(dev); | |
1493 | ||
17fcfbd9 TH |
1494 | do { |
1495 | error = tomoyo_path_number3_acl(r, filename, 1 << operation, | |
1496 | mode, major, minor); | |
1497 | if (!error) | |
1498 | break; | |
1499 | msg = tomoyo_path_number32keyword(operation); | |
1500 | tomoyo_warn_log(r, "%s %s 0%o %u %u", msg, filename->name, | |
1501 | mode, major, minor); | |
1502 | error = tomoyo_supervisor(r, "allow_%s %s 0%o %u %u\n", msg, | |
1503 | tomoyo_file_pattern(filename), mode, | |
1504 | major, minor); | |
1505 | } while (error == TOMOYO_RETRY_REQUEST); | |
1506 | if (r->mode != TOMOYO_CONFIG_ENFORCING) | |
a1f9bb6a TH |
1507 | error = 0; |
1508 | return error; | |
1509 | } | |
1510 | ||
1511 | /** | |
1512 | * tomoyo_path_number3_perm - Check permission for "mkblock" and "mkchar". | |
1513 | * | |
1514 | * @operation: Type of operation. (TOMOYO_TYPE_MKCHAR or TOMOYO_TYPE_MKBLOCK) | |
1515 | * @path: Pointer to "struct path". | |
1516 | * @mode: Create mode. | |
1517 | * @dev: Device number. | |
1518 | * | |
1519 | * Returns 0 on success, negative value otherwise. | |
1520 | */ | |
1521 | int tomoyo_path_number3_perm(const u8 operation, struct path *path, | |
1522 | const unsigned int mode, unsigned int dev) | |
1523 | { | |
1524 | struct tomoyo_request_info r; | |
1525 | int error = -ENOMEM; | |
1526 | struct tomoyo_path_info *buf; | |
1527 | int idx; | |
1528 | ||
1529 | if (tomoyo_init_request_info(&r, NULL) == TOMOYO_CONFIG_DISABLED || | |
1530 | !path->mnt) | |
1531 | return 0; | |
1532 | idx = tomoyo_read_lock(); | |
1533 | error = -ENOMEM; | |
1534 | buf = tomoyo_get_path(path); | |
1535 | if (buf) { | |
1536 | error = tomoyo_path_number3_perm2(&r, operation, buf, mode, | |
1537 | new_decode_dev(dev)); | |
1538 | kfree(buf); | |
1539 | } | |
1540 | tomoyo_read_unlock(idx); | |
1541 | if (r.mode != TOMOYO_CONFIG_ENFORCING) | |
1542 | error = 0; | |
1543 | return error; | |
1544 | } | |
1545 | ||
b69a54ee | 1546 | /** |
7ef61233 | 1547 | * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root". |
b69a54ee | 1548 | * |
b69a54ee KT |
1549 | * @operation: Type of operation. |
1550 | * @path1: Pointer to "struct path". | |
1551 | * @path2: Pointer to "struct path". | |
1552 | * | |
1553 | * Returns 0 on success, negative value otherwise. | |
1554 | */ | |
97d6931e | 1555 | int tomoyo_path2_perm(const u8 operation, struct path *path1, |
7ef61233 | 1556 | struct path *path2) |
b69a54ee KT |
1557 | { |
1558 | int error = -ENOMEM; | |
17fcfbd9 | 1559 | const char *msg; |
cb0abe6a TH |
1560 | struct tomoyo_path_info *buf1; |
1561 | struct tomoyo_path_info *buf2; | |
1562 | struct tomoyo_request_info r; | |
fdb8ebb7 | 1563 | int idx; |
b69a54ee | 1564 | |
cb0abe6a TH |
1565 | if (tomoyo_init_request_info(&r, NULL) == TOMOYO_CONFIG_DISABLED || |
1566 | !path1->mnt || !path2->mnt) | |
b69a54ee | 1567 | return 0; |
fdb8ebb7 | 1568 | idx = tomoyo_read_lock(); |
b69a54ee KT |
1569 | buf1 = tomoyo_get_path(path1); |
1570 | buf2 = tomoyo_get_path(path2); | |
1571 | if (!buf1 || !buf2) | |
1572 | goto out; | |
1573 | { | |
1574 | struct dentry *dentry = path1->dentry; | |
1575 | if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) { | |
1576 | /* | |
1577 | * tomoyo_get_path() reserves space for appending "/." | |
1578 | */ | |
1579 | if (!buf1->is_dir) { | |
1580 | strcat((char *) buf1->name, "/"); | |
1581 | tomoyo_fill_path_info(buf1); | |
1582 | } | |
1583 | if (!buf2->is_dir) { | |
1584 | strcat((char *) buf2->name, "/"); | |
1585 | tomoyo_fill_path_info(buf2); | |
1586 | } | |
1587 | } | |
1588 | } | |
17fcfbd9 TH |
1589 | do { |
1590 | error = tomoyo_path2_acl(&r, operation, buf1, buf2); | |
1591 | if (!error) | |
1592 | break; | |
1593 | msg = tomoyo_path22keyword(operation); | |
1594 | tomoyo_warn_log(&r, "%s %s %s", msg, buf1->name, buf2->name); | |
1595 | error = tomoyo_supervisor(&r, "allow_%s %s %s\n", msg, | |
1596 | tomoyo_file_pattern(buf1), | |
1597 | tomoyo_file_pattern(buf2)); | |
1598 | } while (error == TOMOYO_RETRY_REQUEST); | |
b69a54ee | 1599 | out: |
8e2d39a1 TH |
1600 | kfree(buf1); |
1601 | kfree(buf2); | |
fdb8ebb7 | 1602 | tomoyo_read_unlock(idx); |
cb0abe6a | 1603 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1604 | error = 0; |
1605 | return error; | |
1606 | } | |
a1f9bb6a TH |
1607 | |
1608 | /** | |
1609 | * tomoyo_write_file_policy - Update file related list. | |
1610 | * | |
1611 | * @data: String to parse. | |
1612 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1613 | * @is_delete: True if it is a delete request. | |
1614 | * | |
1615 | * Returns 0 on success, negative value otherwise. | |
1616 | * | |
1617 | * Caller holds tomoyo_read_lock(). | |
1618 | */ | |
1619 | int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, | |
1620 | const bool is_delete) | |
1621 | { | |
1622 | char *w[5]; | |
1623 | u8 type; | |
1624 | if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0]) | |
1625 | return -EINVAL; | |
1626 | if (strncmp(w[0], "allow_", 6)) { | |
1627 | unsigned int perm; | |
1628 | if (sscanf(w[0], "%u", &perm) == 1) | |
1629 | return tomoyo_update_file_acl((u8) perm, w[1], domain, | |
1630 | is_delete); | |
1631 | goto out; | |
1632 | } | |
1633 | w[0] += 6; | |
1634 | for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) { | |
1635 | if (strcmp(w[0], tomoyo_path_keyword[type])) | |
1636 | continue; | |
1637 | return tomoyo_update_path_acl(type, w[1], domain, is_delete); | |
1638 | } | |
1639 | if (!w[2][0]) | |
1640 | goto out; | |
1641 | for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) { | |
1642 | if (strcmp(w[0], tomoyo_path2_keyword[type])) | |
1643 | continue; | |
1644 | return tomoyo_update_path2_acl(type, w[1], w[2], domain, | |
1645 | is_delete); | |
1646 | } | |
1647 | for (type = 0; type < TOMOYO_MAX_PATH_NUMBER_OPERATION; type++) { | |
1648 | if (strcmp(w[0], tomoyo_path_number_keyword[type])) | |
1649 | continue; | |
1650 | return tomoyo_update_path_number_acl(type, w[1], w[2], domain, | |
1651 | is_delete); | |
1652 | } | |
1653 | if (!w[3][0] || !w[4][0]) | |
1654 | goto out; | |
1655 | for (type = 0; type < TOMOYO_MAX_PATH_NUMBER3_OPERATION; type++) { | |
1656 | if (strcmp(w[0], tomoyo_path_number3_keyword[type])) | |
1657 | continue; | |
1658 | return tomoyo_update_path_number3_acl(type, w[1], w[2], w[3], | |
1659 | w[4], domain, is_delete); | |
1660 | } | |
1661 | out: | |
1662 | return -EINVAL; | |
1663 | } |