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1 | /* |
2 | * security/tomoyo/domain.c |
3 | * |
4 | * Domain transition functions for TOMOYO. |
5 | * |
6 | * Copyright (C) 2005-2010 NTT DATA CORPORATION |
7 | */ |
8 | |
9 | #include "common.h" |
10 | #include <linux/binfmts.h> |
11 | #include <linux/slab.h> |
12 | |
13 | /* Variables definitions.*/ |
14 | |
15 | /* The initial domain. */ |
16 | struct tomoyo_domain_info tomoyo_kernel_domain; |
17 | |
18 | /** |
19 | * tomoyo_update_policy - Update an entry for exception policy. |
20 | * |
21 | * @new_entry: Pointer to "struct tomoyo_acl_info". |
22 | * @size: Size of @new_entry in bytes. |
23 | * @is_delete: True if it is a delete request. |
24 | * @list: Pointer to "struct list_head". |
25 | * @check_duplicate: Callback function to find duplicated entry. |
26 | * |
27 | * Returns 0 on success, negative value otherwise. |
28 | * |
29 | * Caller holds tomoyo_read_lock(). |
30 | */ |
31 | int tomoyo_update_policy(struct tomoyo_acl_head *new_entry, const int size, |
32 | bool is_delete, struct list_head *list, |
33 | bool (*check_duplicate) (const struct tomoyo_acl_head |
34 | *, |
35 | const struct tomoyo_acl_head |
36 | *)) |
37 | { |
38 | int error = is_delete ? -ENOENT : -ENOMEM; |
39 | struct tomoyo_acl_head *entry; |
40 | |
41 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
42 | return -ENOMEM; |
43 | list_for_each_entry_rcu(entry, list, list) { |
44 | if (!check_duplicate(entry, new_entry)) |
45 | continue; |
46 | entry->is_deleted = is_delete; |
47 | error = 0; |
48 | break; |
49 | } |
50 | if (error && !is_delete) { |
51 | entry = tomoyo_commit_ok(new_entry, size); |
52 | if (entry) { |
53 | list_add_tail_rcu(&entry->list, list); |
54 | error = 0; |
55 | } |
56 | } |
57 | mutex_unlock(&tomoyo_policy_lock); |
58 | return error; |
59 | } |
60 | |
61 | /** |
62 | * tomoyo_update_domain - Update an entry for domain policy. |
63 | * |
64 | * @new_entry: Pointer to "struct tomoyo_acl_info". |
65 | * @size: Size of @new_entry in bytes. |
66 | * @is_delete: True if it is a delete request. |
67 | * @domain: Pointer to "struct tomoyo_domain_info". |
68 | * @check_duplicate: Callback function to find duplicated entry. |
69 | * @merge_duplicate: Callback function to merge duplicated entry. |
70 | * |
71 | * Returns 0 on success, negative value otherwise. |
72 | * |
73 | * Caller holds tomoyo_read_lock(). |
74 | */ |
75 | int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size, |
76 | bool is_delete, struct tomoyo_domain_info *domain, |
77 | bool (*check_duplicate) (const struct tomoyo_acl_info |
78 | *, |
79 | const struct tomoyo_acl_info |
80 | *), |
81 | bool (*merge_duplicate) (struct tomoyo_acl_info *, |
82 | struct tomoyo_acl_info *, |
83 | const bool)) |
84 | { |
85 | int error = is_delete ? -ENOENT : -ENOMEM; |
86 | struct tomoyo_acl_info *entry; |
87 | |
88 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
89 | return error; |
90 | list_for_each_entry_rcu(entry, &domain->acl_info_list, list) { |
91 | if (!check_duplicate(entry, new_entry)) |
92 | continue; |
93 | if (merge_duplicate) |
94 | entry->is_deleted = merge_duplicate(entry, new_entry, |
95 | is_delete); |
96 | else |
97 | entry->is_deleted = is_delete; |
98 | error = 0; |
99 | break; |
100 | } |
101 | if (error && !is_delete) { |
102 | entry = tomoyo_commit_ok(new_entry, size); |
103 | if (entry) { |
104 | list_add_tail_rcu(&entry->list, &domain->acl_info_list); |
105 | error = 0; |
106 | } |
107 | } |
108 | mutex_unlock(&tomoyo_policy_lock); |
109 | return error; |
110 | } |
111 | |
112 | void tomoyo_check_acl(struct tomoyo_request_info *r, |
113 | bool (*check_entry) (struct tomoyo_request_info *, |
114 | const struct tomoyo_acl_info *)) |
115 | { |
116 | const struct tomoyo_domain_info *domain = r->domain; |
117 | struct tomoyo_acl_info *ptr; |
118 | |
119 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
120 | if (ptr->is_deleted || ptr->type != r->param_type) |
121 | continue; |
122 | if (check_entry(r, ptr)) { |
123 | r->granted = true; |
124 | return; |
125 | } |
126 | } |
127 | r->granted = false; |
128 | } |
129 | |
130 | /* The list for "struct tomoyo_domain_info". */ |
131 | LIST_HEAD(tomoyo_domain_list); |
132 | |
133 | struct list_head tomoyo_policy_list[TOMOYO_MAX_POLICY]; |
134 | struct list_head tomoyo_group_list[TOMOYO_MAX_GROUP]; |
135 | |
136 | /** |
137 | * tomoyo_last_word - Get last component of a domainname. |
138 | * |
139 | * @domainname: Domainname to check. |
140 | * |
141 | * Returns the last word of @domainname. |
142 | */ |
143 | static const char *tomoyo_last_word(const char *name) |
144 | { |
145 | const char *cp = strrchr(name, ' '); |
146 | if (cp) |
147 | return cp + 1; |
148 | return name; |
149 | } |
150 | |
151 | static bool tomoyo_same_transition_control(const struct tomoyo_acl_head *a, |
152 | const struct tomoyo_acl_head *b) |
153 | { |
154 | const struct tomoyo_transition_control *p1 = container_of(a, |
155 | typeof(*p1), |
156 | head); |
157 | const struct tomoyo_transition_control *p2 = container_of(b, |
158 | typeof(*p2), |
159 | head); |
160 | return p1->type == p2->type && p1->is_last_name == p2->is_last_name |
161 | && p1->domainname == p2->domainname |
162 | && p1->program == p2->program; |
163 | } |
164 | |
165 | /** |
166 | * tomoyo_update_transition_control_entry - Update "struct tomoyo_transition_control" list. |
167 | * |
168 | * @domainname: The name of domain. Maybe NULL. |
169 | * @program: The name of program. Maybe NULL. |
170 | * @type: Type of transition. |
171 | * @is_delete: True if it is a delete request. |
172 | * |
173 | * Returns 0 on success, negative value otherwise. |
174 | */ |
175 | static int tomoyo_update_transition_control_entry(const char *domainname, |
176 | const char *program, |
177 | const u8 type, |
178 | const bool is_delete) |
179 | { |
180 | struct tomoyo_transition_control e = { .type = type }; |
181 | int error = is_delete ? -ENOENT : -ENOMEM; |
182 | if (program) { |
183 | if (!tomoyo_correct_path(program)) |
184 | return -EINVAL; |
185 | e.program = tomoyo_get_name(program); |
186 | if (!e.program) |
187 | goto out; |
188 | } |
189 | if (domainname) { |
190 | if (!tomoyo_correct_domain(domainname)) { |
191 | if (!tomoyo_correct_path(domainname)) |
192 | goto out; |
193 | e.is_last_name = true; |
194 | } |
195 | e.domainname = tomoyo_get_name(domainname); |
196 | if (!e.domainname) |
197 | goto out; |
198 | } |
199 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, |
200 | &tomoyo_policy_list |
201 | [TOMOYO_ID_TRANSITION_CONTROL], |
202 | tomoyo_same_transition_control); |
203 | out: |
204 | tomoyo_put_name(e.domainname); |
205 | tomoyo_put_name(e.program); |
206 | return error; |
207 | } |
208 | |
209 | /** |
210 | * tomoyo_write_transition_control - Write "struct tomoyo_transition_control" list. |
211 | * |
212 | * @data: String to parse. |
213 | * @is_delete: True if it is a delete request. |
214 | * @type: Type of this entry. |
215 | * |
216 | * Returns 0 on success, negative value otherwise. |
217 | */ |
218 | int tomoyo_write_transition_control(char *data, const bool is_delete, |
219 | const u8 type) |
220 | { |
221 | char *domainname = strstr(data, " from "); |
222 | if (domainname) { |
223 | *domainname = '\0'; |
224 | domainname += 6; |
225 | } else if (type == TOMOYO_TRANSITION_CONTROL_NO_KEEP || |
226 | type == TOMOYO_TRANSITION_CONTROL_KEEP) { |
227 | domainname = data; |
228 | data = NULL; |
229 | } |
230 | return tomoyo_update_transition_control_entry(domainname, data, type, |
231 | is_delete); |
232 | } |
233 | |
234 | /** |
235 | * tomoyo_transition_type - Get domain transition type. |
236 | * |
237 | * @domainname: The name of domain. |
238 | * @program: The name of program. |
239 | * |
240 | * Returns TOMOYO_TRANSITION_CONTROL_INITIALIZE if executing @program |
241 | * reinitializes domain transition, TOMOYO_TRANSITION_CONTROL_KEEP if executing |
242 | * @program suppresses domain transition, others otherwise. |
243 | * |
244 | * Caller holds tomoyo_read_lock(). |
245 | */ |
246 | static u8 tomoyo_transition_type(const struct tomoyo_path_info *domainname, |
247 | const struct tomoyo_path_info *program) |
248 | { |
249 | const struct tomoyo_transition_control *ptr; |
250 | const char *last_name = tomoyo_last_word(domainname->name); |
251 | u8 type; |
252 | for (type = 0; type < TOMOYO_MAX_TRANSITION_TYPE; type++) { |
253 | next: |
254 | list_for_each_entry_rcu(ptr, &tomoyo_policy_list |
255 | [TOMOYO_ID_TRANSITION_CONTROL], |
256 | head.list) { |
257 | if (ptr->head.is_deleted || ptr->type != type) |
258 | continue; |
259 | if (ptr->domainname) { |
260 | if (!ptr->is_last_name) { |
261 | if (ptr->domainname != domainname) |
262 | continue; |
263 | } else { |
264 | /* |
265 | * Use direct strcmp() since this is |
266 | * unlikely used. |
267 | */ |
268 | if (strcmp(ptr->domainname->name, |
269 | last_name)) |
270 | continue; |
271 | } |
272 | } |
273 | if (ptr->program && |
274 | tomoyo_pathcmp(ptr->program, program)) |
275 | continue; |
276 | if (type == TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE) { |
277 | /* |
278 | * Do not check for initialize_domain if |
279 | * no_initialize_domain matched. |
280 | */ |
281 | type = TOMOYO_TRANSITION_CONTROL_NO_KEEP; |
282 | goto next; |
283 | } |
284 | goto done; |
285 | } |
286 | } |
287 | done: |
288 | return type; |
289 | } |
290 | |
291 | static bool tomoyo_same_aggregator(const struct tomoyo_acl_head *a, |
292 | const struct tomoyo_acl_head *b) |
293 | { |
294 | const struct tomoyo_aggregator *p1 = container_of(a, typeof(*p1), head); |
295 | const struct tomoyo_aggregator *p2 = container_of(b, typeof(*p2), head); |
296 | return p1->original_name == p2->original_name && |
297 | p1->aggregated_name == p2->aggregated_name; |
298 | } |
299 | |
300 | /** |
301 | * tomoyo_update_aggregator_entry - Update "struct tomoyo_aggregator" list. |
302 | * |
303 | * @original_name: The original program's name. |
304 | * @aggregated_name: The program name to use. |
305 | * @is_delete: True if it is a delete request. |
306 | * |
307 | * Returns 0 on success, negative value otherwise. |
308 | * |
309 | * Caller holds tomoyo_read_lock(). |
310 | */ |
311 | static int tomoyo_update_aggregator_entry(const char *original_name, |
312 | const char *aggregated_name, |
313 | const bool is_delete) |
314 | { |
315 | struct tomoyo_aggregator e = { }; |
316 | int error = is_delete ? -ENOENT : -ENOMEM; |
317 | |
318 | if (!tomoyo_correct_path(original_name) || |
319 | !tomoyo_correct_path(aggregated_name)) |
320 | return -EINVAL; |
321 | e.original_name = tomoyo_get_name(original_name); |
322 | e.aggregated_name = tomoyo_get_name(aggregated_name); |
323 | if (!e.original_name || !e.aggregated_name || |
324 | e.aggregated_name->is_patterned) /* No patterns allowed. */ |
325 | goto out; |
326 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, |
327 | &tomoyo_policy_list[TOMOYO_ID_AGGREGATOR], |
328 | tomoyo_same_aggregator); |
329 | out: |
330 | tomoyo_put_name(e.original_name); |
331 | tomoyo_put_name(e.aggregated_name); |
332 | return error; |
333 | } |
334 | |
335 | /** |
336 | * tomoyo_write_aggregator - Write "struct tomoyo_aggregator" list. |
337 | * |
338 | * @data: String to parse. |
339 | * @is_delete: True if it is a delete request. |
340 | * |
341 | * Returns 0 on success, negative value otherwise. |
342 | * |
343 | * Caller holds tomoyo_read_lock(). |
344 | */ |
345 | int tomoyo_write_aggregator(char *data, const bool is_delete) |
346 | { |
347 | char *cp = strchr(data, ' '); |
348 | |
349 | if (!cp) |
350 | return -EINVAL; |
351 | *cp++ = '\0'; |
352 | return tomoyo_update_aggregator_entry(data, cp, is_delete); |
353 | } |
354 | |
355 | /** |
356 | * tomoyo_assign_domain - Create a domain. |
357 | * |
358 | * @domainname: The name of domain. |
359 | * @profile: Profile number to assign if the domain was newly created. |
360 | * |
361 | * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise. |
362 | * |
363 | * Caller holds tomoyo_read_lock(). |
364 | */ |
365 | struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname, |
366 | const u8 profile) |
367 | { |
368 | struct tomoyo_domain_info *entry; |
369 | struct tomoyo_domain_info *domain = NULL; |
370 | const struct tomoyo_path_info *saved_domainname; |
371 | bool found = false; |
372 | |
373 | if (!tomoyo_correct_domain(domainname)) |
374 | return NULL; |
375 | saved_domainname = tomoyo_get_name(domainname); |
376 | if (!saved_domainname) |
377 | return NULL; |
378 | entry = kzalloc(sizeof(*entry), GFP_NOFS); |
379 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
380 | goto out; |
381 | list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { |
382 | if (domain->is_deleted || |
383 | tomoyo_pathcmp(saved_domainname, domain->domainname)) |
384 | continue; |
385 | found = true; |
386 | break; |
387 | } |
388 | if (!found && tomoyo_memory_ok(entry)) { |
389 | INIT_LIST_HEAD(&entry->acl_info_list); |
390 | entry->domainname = saved_domainname; |
391 | saved_domainname = NULL; |
392 | entry->profile = profile; |
393 | list_add_tail_rcu(&entry->list, &tomoyo_domain_list); |
394 | domain = entry; |
395 | entry = NULL; |
396 | found = true; |
397 | } |
398 | mutex_unlock(&tomoyo_policy_lock); |
399 | out: |
400 | tomoyo_put_name(saved_domainname); |
401 | kfree(entry); |
402 | return found ? domain : NULL; |
403 | } |
404 | |
405 | /** |
406 | * tomoyo_find_next_domain - Find a domain. |
407 | * |
408 | * @bprm: Pointer to "struct linux_binprm". |
409 | * |
410 | * Returns 0 on success, negative value otherwise. |
411 | * |
412 | * Caller holds tomoyo_read_lock(). |
413 | */ |
414 | int tomoyo_find_next_domain(struct linux_binprm *bprm) |
415 | { |
416 | struct tomoyo_request_info r; |
417 | char *tmp = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS); |
418 | struct tomoyo_domain_info *old_domain = tomoyo_domain(); |
419 | struct tomoyo_domain_info *domain = NULL; |
420 | const char *original_name = bprm->filename; |
421 | u8 mode; |
422 | bool is_enforce; |
423 | int retval = -ENOMEM; |
424 | bool need_kfree = false; |
425 | struct tomoyo_path_info rn = { }; /* real name */ |
426 | |
427 | mode = tomoyo_init_request_info(&r, NULL, TOMOYO_MAC_FILE_EXECUTE); |
428 | is_enforce = (mode == TOMOYO_CONFIG_ENFORCING); |
429 | if (!tmp) |
430 | goto out; |
431 | |
432 | retry: |
433 | if (need_kfree) { |
434 | kfree(rn.name); |
435 | need_kfree = false; |
436 | } |
437 | /* Get symlink's pathname of program. */ |
438 | retval = -ENOENT; |
439 | rn.name = tomoyo_realpath_nofollow(original_name); |
440 | if (!rn.name) |
441 | goto out; |
442 | tomoyo_fill_path_info(&rn); |
443 | need_kfree = true; |
444 | |
445 | /* Check 'aggregator' directive. */ |
446 | { |
447 | struct tomoyo_aggregator *ptr; |
448 | list_for_each_entry_rcu(ptr, &tomoyo_policy_list |
449 | [TOMOYO_ID_AGGREGATOR], head.list) { |
450 | if (ptr->head.is_deleted || |
451 | !tomoyo_path_matches_pattern(&rn, |
452 | ptr->original_name)) |
453 | continue; |
454 | kfree(rn.name); |
455 | need_kfree = false; |
456 | /* This is OK because it is read only. */ |
457 | rn = *ptr->aggregated_name; |
458 | break; |
459 | } |
460 | } |
461 | |
462 | /* Check execute permission. */ |
463 | retval = tomoyo_path_permission(&r, TOMOYO_TYPE_EXECUTE, &rn); |
464 | if (retval == TOMOYO_RETRY_REQUEST) |
465 | goto retry; |
466 | if (retval < 0) |
467 | goto out; |
468 | /* |
469 | * To be able to specify domainnames with wildcards, use the |
470 | * pathname specified in the policy (which may contain |
471 | * wildcard) rather than the pathname passed to execve() |
472 | * (which never contains wildcard). |
473 | */ |
474 | if (r.param.path.matched_path) { |
475 | if (need_kfree) |
476 | kfree(rn.name); |
477 | need_kfree = false; |
478 | /* This is OK because it is read only. */ |
479 | rn = *r.param.path.matched_path; |
480 | } |
481 | |
482 | /* Calculate domain to transit to. */ |
483 | switch (tomoyo_transition_type(old_domain->domainname, &rn)) { |
484 | case TOMOYO_TRANSITION_CONTROL_INITIALIZE: |
485 | /* Transit to the child of tomoyo_kernel_domain domain. */ |
486 | snprintf(tmp, TOMOYO_EXEC_TMPSIZE - 1, TOMOYO_ROOT_NAME " " |
487 | "%s", rn.name); |
488 | break; |
489 | case TOMOYO_TRANSITION_CONTROL_KEEP: |
490 | /* Keep current domain. */ |
491 | domain = old_domain; |
492 | break; |
493 | default: |
494 | if (old_domain == &tomoyo_kernel_domain && |
495 | !tomoyo_policy_loaded) { |
496 | /* |
497 | * Needn't to transit from kernel domain before |
498 | * starting /sbin/init. But transit from kernel domain |
499 | * if executing initializers because they might start |
500 | * before /sbin/init. |
501 | */ |
502 | domain = old_domain; |
503 | } else { |
504 | /* Normal domain transition. */ |
505 | snprintf(tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s", |
506 | old_domain->domainname->name, rn.name); |
507 | } |
508 | break; |
509 | } |
510 | if (domain || strlen(tmp) >= TOMOYO_EXEC_TMPSIZE - 10) |
511 | goto done; |
512 | domain = tomoyo_find_domain(tmp); |
513 | if (domain) |
514 | goto done; |
515 | if (is_enforce) { |
516 | int error = tomoyo_supervisor(&r, "# wants to create domain\n" |
517 | "%s\n", tmp); |
518 | if (error == TOMOYO_RETRY_REQUEST) |
519 | goto retry; |
520 | if (error < 0) |
521 | goto done; |
522 | } |
523 | domain = tomoyo_assign_domain(tmp, old_domain->profile); |
524 | done: |
525 | if (domain) |
526 | goto out; |
527 | printk(KERN_WARNING "TOMOYO-ERROR: Domain '%s' not defined.\n", tmp); |
528 | if (is_enforce) |
529 | retval = -EPERM; |
530 | else |
531 | old_domain->transition_failed = true; |
532 | out: |
533 | if (!domain) |
534 | domain = old_domain; |
535 | /* Update reference count on "struct tomoyo_domain_info". */ |
536 | atomic_inc(&domain->users); |
537 | bprm->cred->security = domain; |
538 | if (need_kfree) |
539 | kfree(rn.name); |
540 | kfree(tmp); |
541 | return retval; |
542 | } |
543 |
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