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26a2a1c9 KT |
1 | /* |
2 | * security/tomoyo/domain.c | |
3 | * | |
4 | * Implementation of the Domain-Based Mandatory Access Control. | |
5 | * | |
6 | * Copyright (C) 2005-2009 NTT DATA CORPORATION | |
7 | * | |
8 | * Version: 2.2.0-pre 2009/02/01 | |
9 | * | |
10 | */ | |
11 | ||
12 | #include "common.h" | |
13 | #include "tomoyo.h" | |
14 | #include "realpath.h" | |
15 | #include <linux/binfmts.h> | |
16 | ||
17 | /* Variables definitions.*/ | |
18 | ||
19 | /* The initial domain. */ | |
20 | struct tomoyo_domain_info tomoyo_kernel_domain; | |
21 | ||
22 | /* The list for "struct tomoyo_domain_info". */ | |
23 | LIST_HEAD(tomoyo_domain_list); | |
24 | DECLARE_RWSEM(tomoyo_domain_list_lock); | |
25 | ||
26 | /* Structure for "initialize_domain" and "no_initialize_domain" keyword. */ | |
27 | struct tomoyo_domain_initializer_entry { | |
28 | struct list_head list; | |
29 | const struct tomoyo_path_info *domainname; /* This may be NULL */ | |
30 | const struct tomoyo_path_info *program; | |
31 | bool is_deleted; | |
32 | bool is_not; /* True if this entry is "no_initialize_domain". */ | |
33 | /* True if the domainname is tomoyo_get_last_name(). */ | |
34 | bool is_last_name; | |
35 | }; | |
36 | ||
37 | /* Structure for "keep_domain" and "no_keep_domain" keyword. */ | |
38 | struct tomoyo_domain_keeper_entry { | |
39 | struct list_head list; | |
40 | const struct tomoyo_path_info *domainname; | |
41 | const struct tomoyo_path_info *program; /* This may be NULL */ | |
42 | bool is_deleted; | |
43 | bool is_not; /* True if this entry is "no_keep_domain". */ | |
44 | /* True if the domainname is tomoyo_get_last_name(). */ | |
45 | bool is_last_name; | |
46 | }; | |
47 | ||
48 | /* Structure for "alias" keyword. */ | |
49 | struct tomoyo_alias_entry { | |
50 | struct list_head list; | |
51 | const struct tomoyo_path_info *original_name; | |
52 | const struct tomoyo_path_info *aliased_name; | |
53 | bool is_deleted; | |
54 | }; | |
55 | ||
56 | /** | |
57 | * tomoyo_set_domain_flag - Set or clear domain's attribute flags. | |
58 | * | |
59 | * @domain: Pointer to "struct tomoyo_domain_info". | |
60 | * @is_delete: True if it is a delete request. | |
61 | * @flags: Flags to set or clear. | |
62 | * | |
63 | * Returns nothing. | |
64 | */ | |
65 | void tomoyo_set_domain_flag(struct tomoyo_domain_info *domain, | |
66 | const bool is_delete, const u8 flags) | |
67 | { | |
68 | /* We need to serialize because this is bitfield operation. */ | |
69 | static DEFINE_SPINLOCK(lock); | |
70 | /***** CRITICAL SECTION START *****/ | |
71 | spin_lock(&lock); | |
72 | if (!is_delete) | |
73 | domain->flags |= flags; | |
74 | else | |
75 | domain->flags &= ~flags; | |
76 | spin_unlock(&lock); | |
77 | /***** CRITICAL SECTION END *****/ | |
78 | } | |
79 | ||
80 | /** | |
81 | * tomoyo_get_last_name - Get last component of a domainname. | |
82 | * | |
83 | * @domain: Pointer to "struct tomoyo_domain_info". | |
84 | * | |
85 | * Returns the last component of the domainname. | |
86 | */ | |
87 | const char *tomoyo_get_last_name(const struct tomoyo_domain_info *domain) | |
88 | { | |
89 | const char *cp0 = domain->domainname->name; | |
90 | const char *cp1 = strrchr(cp0, ' '); | |
91 | ||
92 | if (cp1) | |
93 | return cp1 + 1; | |
94 | return cp0; | |
95 | } | |
96 | ||
97 | /* The list for "struct tomoyo_domain_initializer_entry". */ | |
98 | static LIST_HEAD(tomoyo_domain_initializer_list); | |
99 | static DECLARE_RWSEM(tomoyo_domain_initializer_list_lock); | |
100 | ||
101 | /** | |
102 | * tomoyo_update_domain_initializer_entry - Update "struct tomoyo_domain_initializer_entry" list. | |
103 | * | |
104 | * @domainname: The name of domain. May be NULL. | |
105 | * @program: The name of program. | |
106 | * @is_not: True if it is "no_initialize_domain" entry. | |
107 | * @is_delete: True if it is a delete request. | |
108 | * | |
109 | * Returns 0 on success, negative value otherwise. | |
110 | */ | |
111 | static int tomoyo_update_domain_initializer_entry(const char *domainname, | |
112 | const char *program, | |
113 | const bool is_not, | |
114 | const bool is_delete) | |
115 | { | |
116 | struct tomoyo_domain_initializer_entry *new_entry; | |
117 | struct tomoyo_domain_initializer_entry *ptr; | |
118 | const struct tomoyo_path_info *saved_program; | |
119 | const struct tomoyo_path_info *saved_domainname = NULL; | |
120 | int error = -ENOMEM; | |
121 | bool is_last_name = false; | |
122 | ||
123 | if (!tomoyo_is_correct_path(program, 1, -1, -1, __func__)) | |
124 | return -EINVAL; /* No patterns allowed. */ | |
125 | if (domainname) { | |
126 | if (!tomoyo_is_domain_def(domainname) && | |
127 | tomoyo_is_correct_path(domainname, 1, -1, -1, __func__)) | |
128 | is_last_name = true; | |
129 | else if (!tomoyo_is_correct_domain(domainname, __func__)) | |
130 | return -EINVAL; | |
131 | saved_domainname = tomoyo_save_name(domainname); | |
132 | if (!saved_domainname) | |
133 | return -ENOMEM; | |
134 | } | |
135 | saved_program = tomoyo_save_name(program); | |
136 | if (!saved_program) | |
137 | return -ENOMEM; | |
138 | /***** EXCLUSIVE SECTION START *****/ | |
139 | down_write(&tomoyo_domain_initializer_list_lock); | |
140 | list_for_each_entry(ptr, &tomoyo_domain_initializer_list, list) { | |
141 | if (ptr->is_not != is_not || | |
142 | ptr->domainname != saved_domainname || | |
143 | ptr->program != saved_program) | |
144 | continue; | |
145 | ptr->is_deleted = is_delete; | |
146 | error = 0; | |
147 | goto out; | |
148 | } | |
149 | if (is_delete) { | |
150 | error = -ENOENT; | |
151 | goto out; | |
152 | } | |
153 | new_entry = tomoyo_alloc_element(sizeof(*new_entry)); | |
154 | if (!new_entry) | |
155 | goto out; | |
156 | new_entry->domainname = saved_domainname; | |
157 | new_entry->program = saved_program; | |
158 | new_entry->is_not = is_not; | |
159 | new_entry->is_last_name = is_last_name; | |
160 | list_add_tail(&new_entry->list, &tomoyo_domain_initializer_list); | |
161 | error = 0; | |
162 | out: | |
163 | up_write(&tomoyo_domain_initializer_list_lock); | |
164 | /***** EXCLUSIVE SECTION END *****/ | |
165 | return error; | |
166 | } | |
167 | ||
168 | /** | |
169 | * tomoyo_read_domain_initializer_policy - Read "struct tomoyo_domain_initializer_entry" list. | |
170 | * | |
171 | * @head: Pointer to "struct tomoyo_io_buffer". | |
172 | * | |
173 | * Returns true on success, false otherwise. | |
174 | */ | |
175 | bool tomoyo_read_domain_initializer_policy(struct tomoyo_io_buffer *head) | |
176 | { | |
177 | struct list_head *pos; | |
178 | bool done = true; | |
179 | ||
180 | down_read(&tomoyo_domain_initializer_list_lock); | |
181 | list_for_each_cookie(pos, head->read_var2, | |
182 | &tomoyo_domain_initializer_list) { | |
183 | const char *no; | |
184 | const char *from = ""; | |
185 | const char *domain = ""; | |
186 | struct tomoyo_domain_initializer_entry *ptr; | |
187 | ptr = list_entry(pos, struct tomoyo_domain_initializer_entry, | |
188 | list); | |
189 | if (ptr->is_deleted) | |
190 | continue; | |
191 | no = ptr->is_not ? "no_" : ""; | |
192 | if (ptr->domainname) { | |
193 | from = " from "; | |
194 | domain = ptr->domainname->name; | |
195 | } | |
196 | if (!tomoyo_io_printf(head, | |
197 | "%s" TOMOYO_KEYWORD_INITIALIZE_DOMAIN | |
198 | "%s%s%s\n", no, ptr->program->name, from, | |
199 | domain)) { | |
200 | done = false; | |
201 | break; | |
202 | } | |
203 | } | |
204 | up_read(&tomoyo_domain_initializer_list_lock); | |
205 | return done; | |
206 | } | |
207 | ||
208 | /** | |
209 | * tomoyo_write_domain_initializer_policy - Write "struct tomoyo_domain_initializer_entry" list. | |
210 | * | |
211 | * @data: String to parse. | |
212 | * @is_not: True if it is "no_initialize_domain" entry. | |
213 | * @is_delete: True if it is a delete request. | |
214 | * | |
215 | * Returns 0 on success, negative value otherwise. | |
216 | */ | |
217 | int tomoyo_write_domain_initializer_policy(char *data, const bool is_not, | |
218 | const bool is_delete) | |
219 | { | |
220 | char *cp = strstr(data, " from "); | |
221 | ||
222 | if (cp) { | |
223 | *cp = '\0'; | |
224 | return tomoyo_update_domain_initializer_entry(cp + 6, data, | |
225 | is_not, | |
226 | is_delete); | |
227 | } | |
228 | return tomoyo_update_domain_initializer_entry(NULL, data, is_not, | |
229 | is_delete); | |
230 | } | |
231 | ||
232 | /** | |
233 | * tomoyo_is_domain_initializer - Check whether the given program causes domainname reinitialization. | |
234 | * | |
235 | * @domainname: The name of domain. | |
236 | * @program: The name of program. | |
237 | * @last_name: The last component of @domainname. | |
238 | * | |
239 | * Returns true if executing @program reinitializes domain transition, | |
240 | * false otherwise. | |
241 | */ | |
242 | static bool tomoyo_is_domain_initializer(const struct tomoyo_path_info * | |
243 | domainname, | |
244 | const struct tomoyo_path_info *program, | |
245 | const struct tomoyo_path_info * | |
246 | last_name) | |
247 | { | |
248 | struct tomoyo_domain_initializer_entry *ptr; | |
249 | bool flag = false; | |
250 | ||
251 | down_read(&tomoyo_domain_initializer_list_lock); | |
252 | list_for_each_entry(ptr, &tomoyo_domain_initializer_list, list) { | |
253 | if (ptr->is_deleted) | |
254 | continue; | |
255 | if (ptr->domainname) { | |
256 | if (!ptr->is_last_name) { | |
257 | if (ptr->domainname != domainname) | |
258 | continue; | |
259 | } else { | |
260 | if (tomoyo_pathcmp(ptr->domainname, last_name)) | |
261 | continue; | |
262 | } | |
263 | } | |
264 | if (tomoyo_pathcmp(ptr->program, program)) | |
265 | continue; | |
266 | if (ptr->is_not) { | |
267 | flag = false; | |
268 | break; | |
269 | } | |
270 | flag = true; | |
271 | } | |
272 | up_read(&tomoyo_domain_initializer_list_lock); | |
273 | return flag; | |
274 | } | |
275 | ||
276 | /* The list for "struct tomoyo_domain_keeper_entry". */ | |
277 | static LIST_HEAD(tomoyo_domain_keeper_list); | |
278 | static DECLARE_RWSEM(tomoyo_domain_keeper_list_lock); | |
279 | ||
280 | /** | |
281 | * tomoyo_update_domain_keeper_entry - Update "struct tomoyo_domain_keeper_entry" list. | |
282 | * | |
283 | * @domainname: The name of domain. | |
284 | * @program: The name of program. May be NULL. | |
285 | * @is_not: True if it is "no_keep_domain" entry. | |
286 | * @is_delete: True if it is a delete request. | |
287 | * | |
288 | * Returns 0 on success, negative value otherwise. | |
289 | */ | |
290 | static int tomoyo_update_domain_keeper_entry(const char *domainname, | |
291 | const char *program, | |
292 | const bool is_not, | |
293 | const bool is_delete) | |
294 | { | |
295 | struct tomoyo_domain_keeper_entry *new_entry; | |
296 | struct tomoyo_domain_keeper_entry *ptr; | |
297 | const struct tomoyo_path_info *saved_domainname; | |
298 | const struct tomoyo_path_info *saved_program = NULL; | |
299 | static DEFINE_MUTEX(lock); | |
300 | int error = -ENOMEM; | |
301 | bool is_last_name = false; | |
302 | ||
303 | if (!tomoyo_is_domain_def(domainname) && | |
304 | tomoyo_is_correct_path(domainname, 1, -1, -1, __func__)) | |
305 | is_last_name = true; | |
306 | else if (!tomoyo_is_correct_domain(domainname, __func__)) | |
307 | return -EINVAL; | |
308 | if (program) { | |
309 | if (!tomoyo_is_correct_path(program, 1, -1, -1, __func__)) | |
310 | return -EINVAL; | |
311 | saved_program = tomoyo_save_name(program); | |
312 | if (!saved_program) | |
313 | return -ENOMEM; | |
314 | } | |
315 | saved_domainname = tomoyo_save_name(domainname); | |
316 | if (!saved_domainname) | |
317 | return -ENOMEM; | |
318 | /***** EXCLUSIVE SECTION START *****/ | |
319 | down_write(&tomoyo_domain_keeper_list_lock); | |
320 | list_for_each_entry(ptr, &tomoyo_domain_keeper_list, list) { | |
321 | if (ptr->is_not != is_not || | |
322 | ptr->domainname != saved_domainname || | |
323 | ptr->program != saved_program) | |
324 | continue; | |
325 | ptr->is_deleted = is_delete; | |
326 | error = 0; | |
327 | goto out; | |
328 | } | |
329 | if (is_delete) { | |
330 | error = -ENOENT; | |
331 | goto out; | |
332 | } | |
333 | new_entry = tomoyo_alloc_element(sizeof(*new_entry)); | |
334 | if (!new_entry) | |
335 | goto out; | |
336 | new_entry->domainname = saved_domainname; | |
337 | new_entry->program = saved_program; | |
338 | new_entry->is_not = is_not; | |
339 | new_entry->is_last_name = is_last_name; | |
340 | list_add_tail(&new_entry->list, &tomoyo_domain_keeper_list); | |
341 | error = 0; | |
342 | out: | |
343 | up_write(&tomoyo_domain_keeper_list_lock); | |
344 | /***** EXCLUSIVE SECTION END *****/ | |
345 | return error; | |
346 | } | |
347 | ||
348 | /** | |
349 | * tomoyo_write_domain_keeper_policy - Write "struct tomoyo_domain_keeper_entry" list. | |
350 | * | |
351 | * @data: String to parse. | |
352 | * @is_not: True if it is "no_keep_domain" entry. | |
353 | * @is_delete: True if it is a delete request. | |
354 | * | |
355 | */ | |
356 | int tomoyo_write_domain_keeper_policy(char *data, const bool is_not, | |
357 | const bool is_delete) | |
358 | { | |
359 | char *cp = strstr(data, " from "); | |
360 | ||
361 | if (cp) { | |
362 | *cp = '\0'; | |
363 | return tomoyo_update_domain_keeper_entry(cp + 6, data, is_not, | |
364 | is_delete); | |
365 | } | |
366 | return tomoyo_update_domain_keeper_entry(data, NULL, is_not, is_delete); | |
367 | } | |
368 | ||
369 | /** | |
370 | * tomoyo_read_domain_keeper_policy - Read "struct tomoyo_domain_keeper_entry" list. | |
371 | * | |
372 | * @head: Pointer to "struct tomoyo_io_buffer". | |
373 | * | |
374 | * Returns true on success, false otherwise. | |
375 | */ | |
376 | bool tomoyo_read_domain_keeper_policy(struct tomoyo_io_buffer *head) | |
377 | { | |
378 | struct list_head *pos; | |
33043cbb | 379 | bool done = true; |
26a2a1c9 KT |
380 | |
381 | down_read(&tomoyo_domain_keeper_list_lock); | |
382 | list_for_each_cookie(pos, head->read_var2, | |
383 | &tomoyo_domain_keeper_list) { | |
384 | struct tomoyo_domain_keeper_entry *ptr; | |
385 | const char *no; | |
386 | const char *from = ""; | |
387 | const char *program = ""; | |
388 | ||
389 | ptr = list_entry(pos, struct tomoyo_domain_keeper_entry, list); | |
390 | if (ptr->is_deleted) | |
391 | continue; | |
392 | no = ptr->is_not ? "no_" : ""; | |
393 | if (ptr->program) { | |
394 | from = " from "; | |
395 | program = ptr->program->name; | |
396 | } | |
397 | if (!tomoyo_io_printf(head, | |
398 | "%s" TOMOYO_KEYWORD_KEEP_DOMAIN | |
399 | "%s%s%s\n", no, program, from, | |
400 | ptr->domainname->name)) { | |
401 | done = false; | |
402 | break; | |
403 | } | |
404 | } | |
405 | up_read(&tomoyo_domain_keeper_list_lock); | |
406 | return done; | |
407 | } | |
408 | ||
409 | /** | |
410 | * tomoyo_is_domain_keeper - Check whether the given program causes domain transition suppression. | |
411 | * | |
412 | * @domainname: The name of domain. | |
413 | * @program: The name of program. | |
414 | * @last_name: The last component of @domainname. | |
415 | * | |
416 | * Returns true if executing @program supresses domain transition, | |
417 | * false otherwise. | |
418 | */ | |
419 | static bool tomoyo_is_domain_keeper(const struct tomoyo_path_info *domainname, | |
420 | const struct tomoyo_path_info *program, | |
421 | const struct tomoyo_path_info *last_name) | |
422 | { | |
423 | struct tomoyo_domain_keeper_entry *ptr; | |
424 | bool flag = false; | |
425 | ||
426 | down_read(&tomoyo_domain_keeper_list_lock); | |
427 | list_for_each_entry(ptr, &tomoyo_domain_keeper_list, list) { | |
428 | if (ptr->is_deleted) | |
429 | continue; | |
430 | if (!ptr->is_last_name) { | |
431 | if (ptr->domainname != domainname) | |
432 | continue; | |
433 | } else { | |
434 | if (tomoyo_pathcmp(ptr->domainname, last_name)) | |
435 | continue; | |
436 | } | |
437 | if (ptr->program && tomoyo_pathcmp(ptr->program, program)) | |
438 | continue; | |
439 | if (ptr->is_not) { | |
440 | flag = false; | |
441 | break; | |
442 | } | |
443 | flag = true; | |
444 | } | |
445 | up_read(&tomoyo_domain_keeper_list_lock); | |
446 | return flag; | |
447 | } | |
448 | ||
449 | /* The list for "struct tomoyo_alias_entry". */ | |
450 | static LIST_HEAD(tomoyo_alias_list); | |
451 | static DECLARE_RWSEM(tomoyo_alias_list_lock); | |
452 | ||
453 | /** | |
454 | * tomoyo_update_alias_entry - Update "struct tomoyo_alias_entry" list. | |
455 | * | |
456 | * @original_name: The original program's real name. | |
457 | * @aliased_name: The symbolic program's symbolic link's name. | |
458 | * @is_delete: True if it is a delete request. | |
459 | * | |
460 | * Returns 0 on success, negative value otherwise. | |
461 | */ | |
462 | static int tomoyo_update_alias_entry(const char *original_name, | |
463 | const char *aliased_name, | |
464 | const bool is_delete) | |
465 | { | |
466 | struct tomoyo_alias_entry *new_entry; | |
467 | struct tomoyo_alias_entry *ptr; | |
468 | const struct tomoyo_path_info *saved_original_name; | |
469 | const struct tomoyo_path_info *saved_aliased_name; | |
470 | int error = -ENOMEM; | |
471 | ||
472 | if (!tomoyo_is_correct_path(original_name, 1, -1, -1, __func__) || | |
473 | !tomoyo_is_correct_path(aliased_name, 1, -1, -1, __func__)) | |
474 | return -EINVAL; /* No patterns allowed. */ | |
475 | saved_original_name = tomoyo_save_name(original_name); | |
476 | saved_aliased_name = tomoyo_save_name(aliased_name); | |
477 | if (!saved_original_name || !saved_aliased_name) | |
478 | return -ENOMEM; | |
479 | /***** EXCLUSIVE SECTION START *****/ | |
480 | down_write(&tomoyo_alias_list_lock); | |
481 | list_for_each_entry(ptr, &tomoyo_alias_list, list) { | |
482 | if (ptr->original_name != saved_original_name || | |
483 | ptr->aliased_name != saved_aliased_name) | |
484 | continue; | |
485 | ptr->is_deleted = is_delete; | |
486 | error = 0; | |
487 | goto out; | |
488 | } | |
489 | if (is_delete) { | |
490 | error = -ENOENT; | |
491 | goto out; | |
492 | } | |
493 | new_entry = tomoyo_alloc_element(sizeof(*new_entry)); | |
494 | if (!new_entry) | |
495 | goto out; | |
496 | new_entry->original_name = saved_original_name; | |
497 | new_entry->aliased_name = saved_aliased_name; | |
498 | list_add_tail(&new_entry->list, &tomoyo_alias_list); | |
499 | error = 0; | |
500 | out: | |
501 | up_write(&tomoyo_alias_list_lock); | |
502 | /***** EXCLUSIVE SECTION END *****/ | |
503 | return error; | |
504 | } | |
505 | ||
506 | /** | |
507 | * tomoyo_read_alias_policy - Read "struct tomoyo_alias_entry" list. | |
508 | * | |
509 | * @head: Pointer to "struct tomoyo_io_buffer". | |
510 | * | |
511 | * Returns true on success, false otherwise. | |
512 | */ | |
513 | bool tomoyo_read_alias_policy(struct tomoyo_io_buffer *head) | |
514 | { | |
515 | struct list_head *pos; | |
516 | bool done = true; | |
517 | ||
518 | down_read(&tomoyo_alias_list_lock); | |
519 | list_for_each_cookie(pos, head->read_var2, &tomoyo_alias_list) { | |
520 | struct tomoyo_alias_entry *ptr; | |
521 | ||
522 | ptr = list_entry(pos, struct tomoyo_alias_entry, list); | |
523 | if (ptr->is_deleted) | |
524 | continue; | |
525 | if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALIAS "%s %s\n", | |
526 | ptr->original_name->name, | |
527 | ptr->aliased_name->name)) { | |
528 | done = false; | |
529 | break; | |
530 | } | |
531 | } | |
532 | up_read(&tomoyo_alias_list_lock); | |
533 | return done; | |
534 | } | |
535 | ||
536 | /** | |
537 | * tomoyo_write_alias_policy - Write "struct tomoyo_alias_entry" list. | |
538 | * | |
539 | * @data: String to parse. | |
540 | * @is_delete: True if it is a delete request. | |
541 | * | |
542 | * Returns 0 on success, negative value otherwise. | |
543 | */ | |
544 | int tomoyo_write_alias_policy(char *data, const bool is_delete) | |
545 | { | |
546 | char *cp = strchr(data, ' '); | |
547 | ||
548 | if (!cp) | |
549 | return -EINVAL; | |
550 | *cp++ = '\0'; | |
551 | return tomoyo_update_alias_entry(data, cp, is_delete); | |
552 | } | |
553 | ||
a0558fc3 | 554 | /* Domain create/delete handler. */ |
26a2a1c9 KT |
555 | |
556 | /** | |
557 | * tomoyo_delete_domain - Delete a domain. | |
558 | * | |
559 | * @domainname: The name of domain. | |
560 | * | |
561 | * Returns 0. | |
562 | */ | |
563 | int tomoyo_delete_domain(char *domainname) | |
564 | { | |
565 | struct tomoyo_domain_info *domain; | |
566 | struct tomoyo_path_info name; | |
567 | ||
568 | name.name = domainname; | |
569 | tomoyo_fill_path_info(&name); | |
570 | /***** EXCLUSIVE SECTION START *****/ | |
571 | down_write(&tomoyo_domain_list_lock); | |
26a2a1c9 KT |
572 | /* Is there an active domain? */ |
573 | list_for_each_entry(domain, &tomoyo_domain_list, list) { | |
26a2a1c9 KT |
574 | /* Never delete tomoyo_kernel_domain */ |
575 | if (domain == &tomoyo_kernel_domain) | |
576 | continue; | |
577 | if (domain->is_deleted || | |
578 | tomoyo_pathcmp(domain->domainname, &name)) | |
579 | continue; | |
a0558fc3 | 580 | domain->is_deleted = true; |
26a2a1c9 KT |
581 | break; |
582 | } | |
583 | up_write(&tomoyo_domain_list_lock); | |
584 | /***** EXCLUSIVE SECTION END *****/ | |
585 | return 0; | |
586 | } | |
587 | ||
26a2a1c9 KT |
588 | /** |
589 | * tomoyo_find_or_assign_new_domain - Create a domain. | |
590 | * | |
591 | * @domainname: The name of domain. | |
592 | * @profile: Profile number to assign if the domain was newly created. | |
593 | * | |
594 | * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise. | |
595 | */ | |
596 | struct tomoyo_domain_info *tomoyo_find_or_assign_new_domain(const char * | |
597 | domainname, | |
598 | const u8 profile) | |
599 | { | |
600 | struct tomoyo_domain_info *domain = NULL; | |
601 | const struct tomoyo_path_info *saved_domainname; | |
602 | ||
603 | /***** EXCLUSIVE SECTION START *****/ | |
604 | down_write(&tomoyo_domain_list_lock); | |
605 | domain = tomoyo_find_domain(domainname); | |
606 | if (domain) | |
607 | goto out; | |
608 | if (!tomoyo_is_correct_domain(domainname, __func__)) | |
609 | goto out; | |
610 | saved_domainname = tomoyo_save_name(domainname); | |
611 | if (!saved_domainname) | |
612 | goto out; | |
613 | /* Can I reuse memory of deleted domain? */ | |
614 | list_for_each_entry(domain, &tomoyo_domain_list, list) { | |
615 | struct task_struct *p; | |
616 | struct tomoyo_acl_info *ptr; | |
617 | bool flag; | |
618 | if (!domain->is_deleted || | |
619 | domain->domainname != saved_domainname) | |
620 | continue; | |
621 | flag = false; | |
622 | /***** CRITICAL SECTION START *****/ | |
623 | read_lock(&tasklist_lock); | |
624 | for_each_process(p) { | |
625 | if (tomoyo_real_domain(p) != domain) | |
626 | continue; | |
627 | flag = true; | |
628 | break; | |
629 | } | |
630 | read_unlock(&tasklist_lock); | |
631 | /***** CRITICAL SECTION END *****/ | |
632 | if (flag) | |
633 | continue; | |
26a2a1c9 KT |
634 | list_for_each_entry(ptr, &domain->acl_info_list, list) { |
635 | ptr->type |= TOMOYO_ACL_DELETED; | |
636 | } | |
637 | tomoyo_set_domain_flag(domain, true, domain->flags); | |
638 | domain->profile = profile; | |
639 | domain->quota_warned = false; | |
640 | mb(); /* Avoid out-of-order execution. */ | |
a0558fc3 | 641 | domain->is_deleted = false; |
26a2a1c9 KT |
642 | goto out; |
643 | } | |
644 | /* No memory reusable. Create using new memory. */ | |
645 | domain = tomoyo_alloc_element(sizeof(*domain)); | |
646 | if (domain) { | |
647 | INIT_LIST_HEAD(&domain->acl_info_list); | |
648 | domain->domainname = saved_domainname; | |
649 | domain->profile = profile; | |
650 | list_add_tail(&domain->list, &tomoyo_domain_list); | |
651 | } | |
652 | out: | |
653 | up_write(&tomoyo_domain_list_lock); | |
654 | /***** EXCLUSIVE SECTION END *****/ | |
655 | return domain; | |
656 | } | |
657 | ||
658 | /** | |
659 | * tomoyo_find_next_domain - Find a domain. | |
660 | * | |
661 | * @bprm: Pointer to "struct linux_binprm". | |
662 | * @next_domain: Pointer to pointer to "struct tomoyo_domain_info". | |
663 | * | |
664 | * Returns 0 on success, negative value otherwise. | |
665 | */ | |
666 | int tomoyo_find_next_domain(struct linux_binprm *bprm, | |
667 | struct tomoyo_domain_info **next_domain) | |
668 | { | |
669 | /* | |
670 | * This function assumes that the size of buffer returned by | |
671 | * tomoyo_realpath() = TOMOYO_MAX_PATHNAME_LEN. | |
672 | */ | |
673 | struct tomoyo_page_buffer *tmp = tomoyo_alloc(sizeof(*tmp)); | |
674 | struct tomoyo_domain_info *old_domain = tomoyo_domain(); | |
675 | struct tomoyo_domain_info *domain = NULL; | |
676 | const char *old_domain_name = old_domain->domainname->name; | |
677 | const char *original_name = bprm->filename; | |
678 | char *new_domain_name = NULL; | |
679 | char *real_program_name = NULL; | |
680 | char *symlink_program_name = NULL; | |
681 | const u8 mode = tomoyo_check_flags(old_domain, TOMOYO_MAC_FOR_FILE); | |
682 | const bool is_enforce = (mode == 3); | |
683 | int retval = -ENOMEM; | |
684 | struct tomoyo_path_info r; /* real name */ | |
685 | struct tomoyo_path_info s; /* symlink name */ | |
686 | struct tomoyo_path_info l; /* last name */ | |
687 | static bool initialized; | |
688 | ||
689 | if (!tmp) | |
690 | goto out; | |
691 | ||
692 | if (!initialized) { | |
693 | /* | |
694 | * Built-in initializers. This is needed because policies are | |
695 | * not loaded until starting /sbin/init. | |
696 | */ | |
697 | tomoyo_update_domain_initializer_entry(NULL, "/sbin/hotplug", | |
698 | false, false); | |
699 | tomoyo_update_domain_initializer_entry(NULL, "/sbin/modprobe", | |
700 | false, false); | |
701 | initialized = true; | |
702 | } | |
703 | ||
704 | /* Get tomoyo_realpath of program. */ | |
705 | retval = -ENOENT; | |
706 | /* I hope tomoyo_realpath() won't fail with -ENOMEM. */ | |
707 | real_program_name = tomoyo_realpath(original_name); | |
708 | if (!real_program_name) | |
709 | goto out; | |
710 | /* Get tomoyo_realpath of symbolic link. */ | |
711 | symlink_program_name = tomoyo_realpath_nofollow(original_name); | |
712 | if (!symlink_program_name) | |
713 | goto out; | |
714 | ||
715 | r.name = real_program_name; | |
716 | tomoyo_fill_path_info(&r); | |
717 | s.name = symlink_program_name; | |
718 | tomoyo_fill_path_info(&s); | |
719 | l.name = tomoyo_get_last_name(old_domain); | |
720 | tomoyo_fill_path_info(&l); | |
721 | ||
722 | /* Check 'alias' directive. */ | |
723 | if (tomoyo_pathcmp(&r, &s)) { | |
724 | struct tomoyo_alias_entry *ptr; | |
725 | /* Is this program allowed to be called via symbolic links? */ | |
726 | down_read(&tomoyo_alias_list_lock); | |
727 | list_for_each_entry(ptr, &tomoyo_alias_list, list) { | |
728 | if (ptr->is_deleted || | |
729 | tomoyo_pathcmp(&r, ptr->original_name) || | |
730 | tomoyo_pathcmp(&s, ptr->aliased_name)) | |
731 | continue; | |
732 | memset(real_program_name, 0, TOMOYO_MAX_PATHNAME_LEN); | |
733 | strncpy(real_program_name, ptr->aliased_name->name, | |
734 | TOMOYO_MAX_PATHNAME_LEN - 1); | |
735 | tomoyo_fill_path_info(&r); | |
736 | break; | |
737 | } | |
738 | up_read(&tomoyo_alias_list_lock); | |
739 | } | |
740 | ||
741 | /* Check execute permission. */ | |
742 | retval = tomoyo_check_exec_perm(old_domain, &r, tmp); | |
743 | if (retval < 0) | |
744 | goto out; | |
745 | ||
746 | new_domain_name = tmp->buffer; | |
747 | if (tomoyo_is_domain_initializer(old_domain->domainname, &r, &l)) { | |
748 | /* Transit to the child of tomoyo_kernel_domain domain. */ | |
749 | snprintf(new_domain_name, TOMOYO_MAX_PATHNAME_LEN + 1, | |
750 | TOMOYO_ROOT_NAME " " "%s", real_program_name); | |
751 | } else if (old_domain == &tomoyo_kernel_domain && | |
752 | !tomoyo_policy_loaded) { | |
753 | /* | |
754 | * Needn't to transit from kernel domain before starting | |
755 | * /sbin/init. But transit from kernel domain if executing | |
756 | * initializers because they might start before /sbin/init. | |
757 | */ | |
758 | domain = old_domain; | |
759 | } else if (tomoyo_is_domain_keeper(old_domain->domainname, &r, &l)) { | |
760 | /* Keep current domain. */ | |
761 | domain = old_domain; | |
762 | } else { | |
763 | /* Normal domain transition. */ | |
764 | snprintf(new_domain_name, TOMOYO_MAX_PATHNAME_LEN + 1, | |
765 | "%s %s", old_domain_name, real_program_name); | |
766 | } | |
767 | if (domain || strlen(new_domain_name) >= TOMOYO_MAX_PATHNAME_LEN) | |
768 | goto done; | |
769 | down_read(&tomoyo_domain_list_lock); | |
770 | domain = tomoyo_find_domain(new_domain_name); | |
771 | up_read(&tomoyo_domain_list_lock); | |
772 | if (domain) | |
773 | goto done; | |
774 | if (is_enforce) | |
775 | goto done; | |
776 | domain = tomoyo_find_or_assign_new_domain(new_domain_name, | |
777 | old_domain->profile); | |
778 | done: | |
779 | if (domain) | |
780 | goto out; | |
781 | printk(KERN_WARNING "TOMOYO-ERROR: Domain '%s' not defined.\n", | |
782 | new_domain_name); | |
783 | if (is_enforce) | |
784 | retval = -EPERM; | |
785 | else | |
786 | tomoyo_set_domain_flag(old_domain, false, | |
787 | TOMOYO_DOMAIN_FLAGS_TRANSITION_FAILED); | |
788 | out: | |
789 | tomoyo_free(real_program_name); | |
790 | tomoyo_free(symlink_program_name); | |
791 | *next_domain = domain ? domain : old_domain; | |
792 | tomoyo_free(tmp); | |
793 | return retval; | |
794 | } |