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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 | * | |
39826a1e | 8 | * Version: 2.2.0 2009/04/01 |
26a2a1c9 KT |
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); | |
26a2a1c9 KT |
70 | spin_lock(&lock); |
71 | if (!is_delete) | |
72 | domain->flags |= flags; | |
73 | else | |
74 | domain->flags &= ~flags; | |
75 | spin_unlock(&lock); | |
26a2a1c9 KT |
76 | } |
77 | ||
78 | /** | |
79 | * tomoyo_get_last_name - Get last component of a domainname. | |
80 | * | |
81 | * @domain: Pointer to "struct tomoyo_domain_info". | |
82 | * | |
83 | * Returns the last component of the domainname. | |
84 | */ | |
85 | const char *tomoyo_get_last_name(const struct tomoyo_domain_info *domain) | |
86 | { | |
87 | const char *cp0 = domain->domainname->name; | |
88 | const char *cp1 = strrchr(cp0, ' '); | |
89 | ||
90 | if (cp1) | |
91 | return cp1 + 1; | |
92 | return cp0; | |
93 | } | |
94 | ||
95 | /* The list for "struct tomoyo_domain_initializer_entry". */ | |
96 | static LIST_HEAD(tomoyo_domain_initializer_list); | |
97 | static DECLARE_RWSEM(tomoyo_domain_initializer_list_lock); | |
98 | ||
99 | /** | |
100 | * tomoyo_update_domain_initializer_entry - Update "struct tomoyo_domain_initializer_entry" list. | |
101 | * | |
102 | * @domainname: The name of domain. May be NULL. | |
103 | * @program: The name of program. | |
104 | * @is_not: True if it is "no_initialize_domain" entry. | |
105 | * @is_delete: True if it is a delete request. | |
106 | * | |
107 | * Returns 0 on success, negative value otherwise. | |
108 | */ | |
109 | static int tomoyo_update_domain_initializer_entry(const char *domainname, | |
110 | const char *program, | |
111 | const bool is_not, | |
112 | const bool is_delete) | |
113 | { | |
114 | struct tomoyo_domain_initializer_entry *new_entry; | |
115 | struct tomoyo_domain_initializer_entry *ptr; | |
116 | const struct tomoyo_path_info *saved_program; | |
117 | const struct tomoyo_path_info *saved_domainname = NULL; | |
118 | int error = -ENOMEM; | |
119 | bool is_last_name = false; | |
120 | ||
121 | if (!tomoyo_is_correct_path(program, 1, -1, -1, __func__)) | |
122 | return -EINVAL; /* No patterns allowed. */ | |
123 | if (domainname) { | |
124 | if (!tomoyo_is_domain_def(domainname) && | |
125 | tomoyo_is_correct_path(domainname, 1, -1, -1, __func__)) | |
126 | is_last_name = true; | |
127 | else if (!tomoyo_is_correct_domain(domainname, __func__)) | |
128 | return -EINVAL; | |
129 | saved_domainname = tomoyo_save_name(domainname); | |
130 | if (!saved_domainname) | |
131 | return -ENOMEM; | |
132 | } | |
133 | saved_program = tomoyo_save_name(program); | |
134 | if (!saved_program) | |
135 | return -ENOMEM; | |
26a2a1c9 KT |
136 | down_write(&tomoyo_domain_initializer_list_lock); |
137 | list_for_each_entry(ptr, &tomoyo_domain_initializer_list, list) { | |
138 | if (ptr->is_not != is_not || | |
139 | ptr->domainname != saved_domainname || | |
140 | ptr->program != saved_program) | |
141 | continue; | |
142 | ptr->is_deleted = is_delete; | |
143 | error = 0; | |
144 | goto out; | |
145 | } | |
146 | if (is_delete) { | |
147 | error = -ENOENT; | |
148 | goto out; | |
149 | } | |
150 | new_entry = tomoyo_alloc_element(sizeof(*new_entry)); | |
151 | if (!new_entry) | |
152 | goto out; | |
153 | new_entry->domainname = saved_domainname; | |
154 | new_entry->program = saved_program; | |
155 | new_entry->is_not = is_not; | |
156 | new_entry->is_last_name = is_last_name; | |
157 | list_add_tail(&new_entry->list, &tomoyo_domain_initializer_list); | |
158 | error = 0; | |
159 | out: | |
160 | up_write(&tomoyo_domain_initializer_list_lock); | |
26a2a1c9 KT |
161 | return error; |
162 | } | |
163 | ||
164 | /** | |
165 | * tomoyo_read_domain_initializer_policy - Read "struct tomoyo_domain_initializer_entry" list. | |
166 | * | |
167 | * @head: Pointer to "struct tomoyo_io_buffer". | |
168 | * | |
169 | * Returns true on success, false otherwise. | |
170 | */ | |
171 | bool tomoyo_read_domain_initializer_policy(struct tomoyo_io_buffer *head) | |
172 | { | |
173 | struct list_head *pos; | |
174 | bool done = true; | |
175 | ||
176 | down_read(&tomoyo_domain_initializer_list_lock); | |
177 | list_for_each_cookie(pos, head->read_var2, | |
178 | &tomoyo_domain_initializer_list) { | |
179 | const char *no; | |
180 | const char *from = ""; | |
181 | const char *domain = ""; | |
182 | struct tomoyo_domain_initializer_entry *ptr; | |
183 | ptr = list_entry(pos, struct tomoyo_domain_initializer_entry, | |
184 | list); | |
185 | if (ptr->is_deleted) | |
186 | continue; | |
187 | no = ptr->is_not ? "no_" : ""; | |
188 | if (ptr->domainname) { | |
189 | from = " from "; | |
190 | domain = ptr->domainname->name; | |
191 | } | |
7d2948b1 TH |
192 | done = tomoyo_io_printf(head, |
193 | "%s" TOMOYO_KEYWORD_INITIALIZE_DOMAIN | |
194 | "%s%s%s\n", no, ptr->program->name, | |
195 | from, domain); | |
196 | if (!done) | |
26a2a1c9 | 197 | break; |
26a2a1c9 KT |
198 | } |
199 | up_read(&tomoyo_domain_initializer_list_lock); | |
200 | return done; | |
201 | } | |
202 | ||
203 | /** | |
204 | * tomoyo_write_domain_initializer_policy - Write "struct tomoyo_domain_initializer_entry" list. | |
205 | * | |
206 | * @data: String to parse. | |
207 | * @is_not: True if it is "no_initialize_domain" entry. | |
208 | * @is_delete: True if it is a delete request. | |
209 | * | |
210 | * Returns 0 on success, negative value otherwise. | |
211 | */ | |
212 | int tomoyo_write_domain_initializer_policy(char *data, const bool is_not, | |
213 | const bool is_delete) | |
214 | { | |
215 | char *cp = strstr(data, " from "); | |
216 | ||
217 | if (cp) { | |
218 | *cp = '\0'; | |
219 | return tomoyo_update_domain_initializer_entry(cp + 6, data, | |
220 | is_not, | |
221 | is_delete); | |
222 | } | |
223 | return tomoyo_update_domain_initializer_entry(NULL, data, is_not, | |
224 | is_delete); | |
225 | } | |
226 | ||
227 | /** | |
228 | * tomoyo_is_domain_initializer - Check whether the given program causes domainname reinitialization. | |
229 | * | |
230 | * @domainname: The name of domain. | |
231 | * @program: The name of program. | |
232 | * @last_name: The last component of @domainname. | |
233 | * | |
234 | * Returns true if executing @program reinitializes domain transition, | |
235 | * false otherwise. | |
236 | */ | |
237 | static bool tomoyo_is_domain_initializer(const struct tomoyo_path_info * | |
238 | domainname, | |
239 | const struct tomoyo_path_info *program, | |
240 | const struct tomoyo_path_info * | |
241 | last_name) | |
242 | { | |
243 | struct tomoyo_domain_initializer_entry *ptr; | |
244 | bool flag = false; | |
245 | ||
246 | down_read(&tomoyo_domain_initializer_list_lock); | |
247 | list_for_each_entry(ptr, &tomoyo_domain_initializer_list, list) { | |
248 | if (ptr->is_deleted) | |
249 | continue; | |
250 | if (ptr->domainname) { | |
251 | if (!ptr->is_last_name) { | |
252 | if (ptr->domainname != domainname) | |
253 | continue; | |
254 | } else { | |
255 | if (tomoyo_pathcmp(ptr->domainname, last_name)) | |
256 | continue; | |
257 | } | |
258 | } | |
259 | if (tomoyo_pathcmp(ptr->program, program)) | |
260 | continue; | |
261 | if (ptr->is_not) { | |
262 | flag = false; | |
263 | break; | |
264 | } | |
265 | flag = true; | |
266 | } | |
267 | up_read(&tomoyo_domain_initializer_list_lock); | |
268 | return flag; | |
269 | } | |
270 | ||
271 | /* The list for "struct tomoyo_domain_keeper_entry". */ | |
272 | static LIST_HEAD(tomoyo_domain_keeper_list); | |
273 | static DECLARE_RWSEM(tomoyo_domain_keeper_list_lock); | |
274 | ||
275 | /** | |
276 | * tomoyo_update_domain_keeper_entry - Update "struct tomoyo_domain_keeper_entry" list. | |
277 | * | |
278 | * @domainname: The name of domain. | |
279 | * @program: The name of program. May be NULL. | |
280 | * @is_not: True if it is "no_keep_domain" entry. | |
281 | * @is_delete: True if it is a delete request. | |
282 | * | |
283 | * Returns 0 on success, negative value otherwise. | |
284 | */ | |
285 | static int tomoyo_update_domain_keeper_entry(const char *domainname, | |
286 | const char *program, | |
287 | const bool is_not, | |
288 | const bool is_delete) | |
289 | { | |
290 | struct tomoyo_domain_keeper_entry *new_entry; | |
291 | struct tomoyo_domain_keeper_entry *ptr; | |
292 | const struct tomoyo_path_info *saved_domainname; | |
293 | const struct tomoyo_path_info *saved_program = NULL; | |
26a2a1c9 KT |
294 | int error = -ENOMEM; |
295 | bool is_last_name = false; | |
296 | ||
297 | if (!tomoyo_is_domain_def(domainname) && | |
298 | tomoyo_is_correct_path(domainname, 1, -1, -1, __func__)) | |
299 | is_last_name = true; | |
300 | else if (!tomoyo_is_correct_domain(domainname, __func__)) | |
301 | return -EINVAL; | |
302 | if (program) { | |
303 | if (!tomoyo_is_correct_path(program, 1, -1, -1, __func__)) | |
304 | return -EINVAL; | |
305 | saved_program = tomoyo_save_name(program); | |
306 | if (!saved_program) | |
307 | return -ENOMEM; | |
308 | } | |
309 | saved_domainname = tomoyo_save_name(domainname); | |
310 | if (!saved_domainname) | |
311 | return -ENOMEM; | |
26a2a1c9 KT |
312 | down_write(&tomoyo_domain_keeper_list_lock); |
313 | list_for_each_entry(ptr, &tomoyo_domain_keeper_list, list) { | |
314 | if (ptr->is_not != is_not || | |
315 | ptr->domainname != saved_domainname || | |
316 | ptr->program != saved_program) | |
317 | continue; | |
318 | ptr->is_deleted = is_delete; | |
319 | error = 0; | |
320 | goto out; | |
321 | } | |
322 | if (is_delete) { | |
323 | error = -ENOENT; | |
324 | goto out; | |
325 | } | |
326 | new_entry = tomoyo_alloc_element(sizeof(*new_entry)); | |
327 | if (!new_entry) | |
328 | goto out; | |
329 | new_entry->domainname = saved_domainname; | |
330 | new_entry->program = saved_program; | |
331 | new_entry->is_not = is_not; | |
332 | new_entry->is_last_name = is_last_name; | |
333 | list_add_tail(&new_entry->list, &tomoyo_domain_keeper_list); | |
334 | error = 0; | |
335 | out: | |
336 | up_write(&tomoyo_domain_keeper_list_lock); | |
26a2a1c9 KT |
337 | return error; |
338 | } | |
339 | ||
340 | /** | |
341 | * tomoyo_write_domain_keeper_policy - Write "struct tomoyo_domain_keeper_entry" list. | |
342 | * | |
343 | * @data: String to parse. | |
344 | * @is_not: True if it is "no_keep_domain" entry. | |
345 | * @is_delete: True if it is a delete request. | |
346 | * | |
347 | */ | |
348 | int tomoyo_write_domain_keeper_policy(char *data, const bool is_not, | |
349 | const bool is_delete) | |
350 | { | |
351 | char *cp = strstr(data, " from "); | |
352 | ||
353 | if (cp) { | |
354 | *cp = '\0'; | |
355 | return tomoyo_update_domain_keeper_entry(cp + 6, data, is_not, | |
356 | is_delete); | |
357 | } | |
358 | return tomoyo_update_domain_keeper_entry(data, NULL, is_not, is_delete); | |
359 | } | |
360 | ||
361 | /** | |
362 | * tomoyo_read_domain_keeper_policy - Read "struct tomoyo_domain_keeper_entry" list. | |
363 | * | |
364 | * @head: Pointer to "struct tomoyo_io_buffer". | |
365 | * | |
366 | * Returns true on success, false otherwise. | |
367 | */ | |
368 | bool tomoyo_read_domain_keeper_policy(struct tomoyo_io_buffer *head) | |
369 | { | |
370 | struct list_head *pos; | |
33043cbb | 371 | bool done = true; |
26a2a1c9 KT |
372 | |
373 | down_read(&tomoyo_domain_keeper_list_lock); | |
374 | list_for_each_cookie(pos, head->read_var2, | |
375 | &tomoyo_domain_keeper_list) { | |
376 | struct tomoyo_domain_keeper_entry *ptr; | |
377 | const char *no; | |
378 | const char *from = ""; | |
379 | const char *program = ""; | |
380 | ||
381 | ptr = list_entry(pos, struct tomoyo_domain_keeper_entry, list); | |
382 | if (ptr->is_deleted) | |
383 | continue; | |
384 | no = ptr->is_not ? "no_" : ""; | |
385 | if (ptr->program) { | |
386 | from = " from "; | |
387 | program = ptr->program->name; | |
388 | } | |
7d2948b1 TH |
389 | done = tomoyo_io_printf(head, |
390 | "%s" TOMOYO_KEYWORD_KEEP_DOMAIN | |
391 | "%s%s%s\n", no, program, from, | |
392 | ptr->domainname->name); | |
393 | if (!done) | |
26a2a1c9 | 394 | break; |
26a2a1c9 KT |
395 | } |
396 | up_read(&tomoyo_domain_keeper_list_lock); | |
397 | return done; | |
398 | } | |
399 | ||
400 | /** | |
401 | * tomoyo_is_domain_keeper - Check whether the given program causes domain transition suppression. | |
402 | * | |
403 | * @domainname: The name of domain. | |
404 | * @program: The name of program. | |
405 | * @last_name: The last component of @domainname. | |
406 | * | |
407 | * Returns true if executing @program supresses domain transition, | |
408 | * false otherwise. | |
409 | */ | |
410 | static bool tomoyo_is_domain_keeper(const struct tomoyo_path_info *domainname, | |
411 | const struct tomoyo_path_info *program, | |
412 | const struct tomoyo_path_info *last_name) | |
413 | { | |
414 | struct tomoyo_domain_keeper_entry *ptr; | |
415 | bool flag = false; | |
416 | ||
417 | down_read(&tomoyo_domain_keeper_list_lock); | |
418 | list_for_each_entry(ptr, &tomoyo_domain_keeper_list, list) { | |
419 | if (ptr->is_deleted) | |
420 | continue; | |
421 | if (!ptr->is_last_name) { | |
422 | if (ptr->domainname != domainname) | |
423 | continue; | |
424 | } else { | |
425 | if (tomoyo_pathcmp(ptr->domainname, last_name)) | |
426 | continue; | |
427 | } | |
428 | if (ptr->program && tomoyo_pathcmp(ptr->program, program)) | |
429 | continue; | |
430 | if (ptr->is_not) { | |
431 | flag = false; | |
432 | break; | |
433 | } | |
434 | flag = true; | |
435 | } | |
436 | up_read(&tomoyo_domain_keeper_list_lock); | |
437 | return flag; | |
438 | } | |
439 | ||
440 | /* The list for "struct tomoyo_alias_entry". */ | |
441 | static LIST_HEAD(tomoyo_alias_list); | |
442 | static DECLARE_RWSEM(tomoyo_alias_list_lock); | |
443 | ||
444 | /** | |
445 | * tomoyo_update_alias_entry - Update "struct tomoyo_alias_entry" list. | |
446 | * | |
447 | * @original_name: The original program's real name. | |
448 | * @aliased_name: The symbolic program's symbolic link's name. | |
449 | * @is_delete: True if it is a delete request. | |
450 | * | |
451 | * Returns 0 on success, negative value otherwise. | |
452 | */ | |
453 | static int tomoyo_update_alias_entry(const char *original_name, | |
454 | const char *aliased_name, | |
455 | const bool is_delete) | |
456 | { | |
457 | struct tomoyo_alias_entry *new_entry; | |
458 | struct tomoyo_alias_entry *ptr; | |
459 | const struct tomoyo_path_info *saved_original_name; | |
460 | const struct tomoyo_path_info *saved_aliased_name; | |
461 | int error = -ENOMEM; | |
462 | ||
463 | if (!tomoyo_is_correct_path(original_name, 1, -1, -1, __func__) || | |
464 | !tomoyo_is_correct_path(aliased_name, 1, -1, -1, __func__)) | |
465 | return -EINVAL; /* No patterns allowed. */ | |
466 | saved_original_name = tomoyo_save_name(original_name); | |
467 | saved_aliased_name = tomoyo_save_name(aliased_name); | |
468 | if (!saved_original_name || !saved_aliased_name) | |
469 | return -ENOMEM; | |
26a2a1c9 KT |
470 | down_write(&tomoyo_alias_list_lock); |
471 | list_for_each_entry(ptr, &tomoyo_alias_list, list) { | |
472 | if (ptr->original_name != saved_original_name || | |
473 | ptr->aliased_name != saved_aliased_name) | |
474 | continue; | |
475 | ptr->is_deleted = is_delete; | |
476 | error = 0; | |
477 | goto out; | |
478 | } | |
479 | if (is_delete) { | |
480 | error = -ENOENT; | |
481 | goto out; | |
482 | } | |
483 | new_entry = tomoyo_alloc_element(sizeof(*new_entry)); | |
484 | if (!new_entry) | |
485 | goto out; | |
486 | new_entry->original_name = saved_original_name; | |
487 | new_entry->aliased_name = saved_aliased_name; | |
488 | list_add_tail(&new_entry->list, &tomoyo_alias_list); | |
489 | error = 0; | |
490 | out: | |
491 | up_write(&tomoyo_alias_list_lock); | |
26a2a1c9 KT |
492 | return error; |
493 | } | |
494 | ||
495 | /** | |
496 | * tomoyo_read_alias_policy - Read "struct tomoyo_alias_entry" list. | |
497 | * | |
498 | * @head: Pointer to "struct tomoyo_io_buffer". | |
499 | * | |
500 | * Returns true on success, false otherwise. | |
501 | */ | |
502 | bool tomoyo_read_alias_policy(struct tomoyo_io_buffer *head) | |
503 | { | |
504 | struct list_head *pos; | |
505 | bool done = true; | |
506 | ||
507 | down_read(&tomoyo_alias_list_lock); | |
508 | list_for_each_cookie(pos, head->read_var2, &tomoyo_alias_list) { | |
509 | struct tomoyo_alias_entry *ptr; | |
510 | ||
511 | ptr = list_entry(pos, struct tomoyo_alias_entry, list); | |
512 | if (ptr->is_deleted) | |
513 | continue; | |
7d2948b1 TH |
514 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALIAS "%s %s\n", |
515 | ptr->original_name->name, | |
516 | ptr->aliased_name->name); | |
517 | if (!done) | |
26a2a1c9 | 518 | break; |
26a2a1c9 KT |
519 | } |
520 | up_read(&tomoyo_alias_list_lock); | |
521 | return done; | |
522 | } | |
523 | ||
524 | /** | |
525 | * tomoyo_write_alias_policy - Write "struct tomoyo_alias_entry" list. | |
526 | * | |
527 | * @data: String to parse. | |
528 | * @is_delete: True if it is a delete request. | |
529 | * | |
530 | * Returns 0 on success, negative value otherwise. | |
531 | */ | |
532 | int tomoyo_write_alias_policy(char *data, const bool is_delete) | |
533 | { | |
534 | char *cp = strchr(data, ' '); | |
535 | ||
536 | if (!cp) | |
537 | return -EINVAL; | |
538 | *cp++ = '\0'; | |
539 | return tomoyo_update_alias_entry(data, cp, is_delete); | |
540 | } | |
541 | ||
a0558fc3 | 542 | /* Domain create/delete handler. */ |
26a2a1c9 KT |
543 | |
544 | /** | |
545 | * tomoyo_delete_domain - Delete a domain. | |
546 | * | |
547 | * @domainname: The name of domain. | |
548 | * | |
549 | * Returns 0. | |
550 | */ | |
551 | int tomoyo_delete_domain(char *domainname) | |
552 | { | |
553 | struct tomoyo_domain_info *domain; | |
554 | struct tomoyo_path_info name; | |
555 | ||
556 | name.name = domainname; | |
557 | tomoyo_fill_path_info(&name); | |
26a2a1c9 | 558 | down_write(&tomoyo_domain_list_lock); |
26a2a1c9 KT |
559 | /* Is there an active domain? */ |
560 | list_for_each_entry(domain, &tomoyo_domain_list, list) { | |
26a2a1c9 KT |
561 | /* Never delete tomoyo_kernel_domain */ |
562 | if (domain == &tomoyo_kernel_domain) | |
563 | continue; | |
564 | if (domain->is_deleted || | |
565 | tomoyo_pathcmp(domain->domainname, &name)) | |
566 | continue; | |
a0558fc3 | 567 | domain->is_deleted = true; |
26a2a1c9 KT |
568 | break; |
569 | } | |
570 | up_write(&tomoyo_domain_list_lock); | |
26a2a1c9 KT |
571 | return 0; |
572 | } | |
573 | ||
26a2a1c9 KT |
574 | /** |
575 | * tomoyo_find_or_assign_new_domain - Create a domain. | |
576 | * | |
577 | * @domainname: The name of domain. | |
578 | * @profile: Profile number to assign if the domain was newly created. | |
579 | * | |
580 | * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise. | |
581 | */ | |
582 | struct tomoyo_domain_info *tomoyo_find_or_assign_new_domain(const char * | |
583 | domainname, | |
584 | const u8 profile) | |
585 | { | |
586 | struct tomoyo_domain_info *domain = NULL; | |
587 | const struct tomoyo_path_info *saved_domainname; | |
588 | ||
26a2a1c9 KT |
589 | down_write(&tomoyo_domain_list_lock); |
590 | domain = tomoyo_find_domain(domainname); | |
591 | if (domain) | |
592 | goto out; | |
593 | if (!tomoyo_is_correct_domain(domainname, __func__)) | |
594 | goto out; | |
595 | saved_domainname = tomoyo_save_name(domainname); | |
596 | if (!saved_domainname) | |
597 | goto out; | |
598 | /* Can I reuse memory of deleted domain? */ | |
599 | list_for_each_entry(domain, &tomoyo_domain_list, list) { | |
600 | struct task_struct *p; | |
601 | struct tomoyo_acl_info *ptr; | |
602 | bool flag; | |
603 | if (!domain->is_deleted || | |
604 | domain->domainname != saved_domainname) | |
605 | continue; | |
606 | flag = false; | |
26a2a1c9 KT |
607 | read_lock(&tasklist_lock); |
608 | for_each_process(p) { | |
609 | if (tomoyo_real_domain(p) != domain) | |
610 | continue; | |
611 | flag = true; | |
612 | break; | |
613 | } | |
614 | read_unlock(&tasklist_lock); | |
26a2a1c9 KT |
615 | if (flag) |
616 | continue; | |
26a2a1c9 KT |
617 | list_for_each_entry(ptr, &domain->acl_info_list, list) { |
618 | ptr->type |= TOMOYO_ACL_DELETED; | |
619 | } | |
620 | tomoyo_set_domain_flag(domain, true, domain->flags); | |
621 | domain->profile = profile; | |
622 | domain->quota_warned = false; | |
623 | mb(); /* Avoid out-of-order execution. */ | |
a0558fc3 | 624 | domain->is_deleted = false; |
26a2a1c9 KT |
625 | goto out; |
626 | } | |
627 | /* No memory reusable. Create using new memory. */ | |
628 | domain = tomoyo_alloc_element(sizeof(*domain)); | |
629 | if (domain) { | |
630 | INIT_LIST_HEAD(&domain->acl_info_list); | |
631 | domain->domainname = saved_domainname; | |
632 | domain->profile = profile; | |
633 | list_add_tail(&domain->list, &tomoyo_domain_list); | |
634 | } | |
635 | out: | |
636 | up_write(&tomoyo_domain_list_lock); | |
26a2a1c9 KT |
637 | return domain; |
638 | } | |
639 | ||
640 | /** | |
641 | * tomoyo_find_next_domain - Find a domain. | |
642 | * | |
643 | * @bprm: Pointer to "struct linux_binprm". | |
644 | * @next_domain: Pointer to pointer to "struct tomoyo_domain_info". | |
645 | * | |
646 | * Returns 0 on success, negative value otherwise. | |
647 | */ | |
648 | int tomoyo_find_next_domain(struct linux_binprm *bprm, | |
649 | struct tomoyo_domain_info **next_domain) | |
650 | { | |
651 | /* | |
652 | * This function assumes that the size of buffer returned by | |
653 | * tomoyo_realpath() = TOMOYO_MAX_PATHNAME_LEN. | |
654 | */ | |
655 | struct tomoyo_page_buffer *tmp = tomoyo_alloc(sizeof(*tmp)); | |
656 | struct tomoyo_domain_info *old_domain = tomoyo_domain(); | |
657 | struct tomoyo_domain_info *domain = NULL; | |
658 | const char *old_domain_name = old_domain->domainname->name; | |
659 | const char *original_name = bprm->filename; | |
660 | char *new_domain_name = NULL; | |
661 | char *real_program_name = NULL; | |
662 | char *symlink_program_name = NULL; | |
663 | const u8 mode = tomoyo_check_flags(old_domain, TOMOYO_MAC_FOR_FILE); | |
664 | const bool is_enforce = (mode == 3); | |
665 | int retval = -ENOMEM; | |
666 | struct tomoyo_path_info r; /* real name */ | |
667 | struct tomoyo_path_info s; /* symlink name */ | |
668 | struct tomoyo_path_info l; /* last name */ | |
669 | static bool initialized; | |
670 | ||
671 | if (!tmp) | |
672 | goto out; | |
673 | ||
674 | if (!initialized) { | |
675 | /* | |
676 | * Built-in initializers. This is needed because policies are | |
677 | * not loaded until starting /sbin/init. | |
678 | */ | |
679 | tomoyo_update_domain_initializer_entry(NULL, "/sbin/hotplug", | |
680 | false, false); | |
681 | tomoyo_update_domain_initializer_entry(NULL, "/sbin/modprobe", | |
682 | false, false); | |
683 | initialized = true; | |
684 | } | |
685 | ||
686 | /* Get tomoyo_realpath of program. */ | |
687 | retval = -ENOENT; | |
688 | /* I hope tomoyo_realpath() won't fail with -ENOMEM. */ | |
689 | real_program_name = tomoyo_realpath(original_name); | |
690 | if (!real_program_name) | |
691 | goto out; | |
692 | /* Get tomoyo_realpath of symbolic link. */ | |
693 | symlink_program_name = tomoyo_realpath_nofollow(original_name); | |
694 | if (!symlink_program_name) | |
695 | goto out; | |
696 | ||
697 | r.name = real_program_name; | |
698 | tomoyo_fill_path_info(&r); | |
699 | s.name = symlink_program_name; | |
700 | tomoyo_fill_path_info(&s); | |
701 | l.name = tomoyo_get_last_name(old_domain); | |
702 | tomoyo_fill_path_info(&l); | |
703 | ||
704 | /* Check 'alias' directive. */ | |
705 | if (tomoyo_pathcmp(&r, &s)) { | |
706 | struct tomoyo_alias_entry *ptr; | |
707 | /* Is this program allowed to be called via symbolic links? */ | |
708 | down_read(&tomoyo_alias_list_lock); | |
709 | list_for_each_entry(ptr, &tomoyo_alias_list, list) { | |
710 | if (ptr->is_deleted || | |
711 | tomoyo_pathcmp(&r, ptr->original_name) || | |
712 | tomoyo_pathcmp(&s, ptr->aliased_name)) | |
713 | continue; | |
714 | memset(real_program_name, 0, TOMOYO_MAX_PATHNAME_LEN); | |
715 | strncpy(real_program_name, ptr->aliased_name->name, | |
716 | TOMOYO_MAX_PATHNAME_LEN - 1); | |
717 | tomoyo_fill_path_info(&r); | |
718 | break; | |
719 | } | |
720 | up_read(&tomoyo_alias_list_lock); | |
721 | } | |
722 | ||
723 | /* Check execute permission. */ | |
724 | retval = tomoyo_check_exec_perm(old_domain, &r, tmp); | |
725 | if (retval < 0) | |
726 | goto out; | |
727 | ||
728 | new_domain_name = tmp->buffer; | |
729 | if (tomoyo_is_domain_initializer(old_domain->domainname, &r, &l)) { | |
730 | /* Transit to the child of tomoyo_kernel_domain domain. */ | |
731 | snprintf(new_domain_name, TOMOYO_MAX_PATHNAME_LEN + 1, | |
732 | TOMOYO_ROOT_NAME " " "%s", real_program_name); | |
733 | } else if (old_domain == &tomoyo_kernel_domain && | |
734 | !tomoyo_policy_loaded) { | |
735 | /* | |
736 | * Needn't to transit from kernel domain before starting | |
737 | * /sbin/init. But transit from kernel domain if executing | |
738 | * initializers because they might start before /sbin/init. | |
739 | */ | |
740 | domain = old_domain; | |
741 | } else if (tomoyo_is_domain_keeper(old_domain->domainname, &r, &l)) { | |
742 | /* Keep current domain. */ | |
743 | domain = old_domain; | |
744 | } else { | |
745 | /* Normal domain transition. */ | |
746 | snprintf(new_domain_name, TOMOYO_MAX_PATHNAME_LEN + 1, | |
747 | "%s %s", old_domain_name, real_program_name); | |
748 | } | |
749 | if (domain || strlen(new_domain_name) >= TOMOYO_MAX_PATHNAME_LEN) | |
750 | goto done; | |
751 | down_read(&tomoyo_domain_list_lock); | |
752 | domain = tomoyo_find_domain(new_domain_name); | |
753 | up_read(&tomoyo_domain_list_lock); | |
754 | if (domain) | |
755 | goto done; | |
756 | if (is_enforce) | |
757 | goto done; | |
758 | domain = tomoyo_find_or_assign_new_domain(new_domain_name, | |
759 | old_domain->profile); | |
760 | done: | |
761 | if (domain) | |
762 | goto out; | |
763 | printk(KERN_WARNING "TOMOYO-ERROR: Domain '%s' not defined.\n", | |
764 | new_domain_name); | |
765 | if (is_enforce) | |
766 | retval = -EPERM; | |
767 | else | |
768 | tomoyo_set_domain_flag(old_domain, false, | |
769 | TOMOYO_DOMAIN_FLAGS_TRANSITION_FAILED); | |
770 | out: | |
771 | tomoyo_free(real_program_name); | |
772 | tomoyo_free(symlink_program_name); | |
773 | *next_domain = domain ? domain : old_domain; | |
774 | tomoyo_free(tmp); | |
775 | return retval; | |
776 | } |