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1 | /* |
2 | * security/tomoyo/domain.c |
3 | * |
4 | * Copyright (C) 2005-2011 NTT DATA CORPORATION |
5 | */ |
6 | |
7 | #include "common.h" |
8 | #include <linux/binfmts.h> |
9 | #include <linux/slab.h> |
10 | |
11 | /* Variables definitions.*/ |
12 | |
13 | /* The initial domain. */ |
14 | struct tomoyo_domain_info tomoyo_kernel_domain; |
15 | |
16 | /** |
17 | * tomoyo_update_policy - Update an entry for exception policy. |
18 | * |
19 | * @new_entry: Pointer to "struct tomoyo_acl_info". |
20 | * @size: Size of @new_entry in bytes. |
21 | * @param: Pointer to "struct tomoyo_acl_param". |
22 | * @check_duplicate: Callback function to find duplicated entry. |
23 | * |
24 | * Returns 0 on success, negative value otherwise. |
25 | * |
26 | * Caller holds tomoyo_read_lock(). |
27 | */ |
28 | int tomoyo_update_policy(struct tomoyo_acl_head *new_entry, const int size, |
29 | struct tomoyo_acl_param *param, |
30 | bool (*check_duplicate) (const struct tomoyo_acl_head |
31 | *, |
32 | const struct tomoyo_acl_head |
33 | *)) |
34 | { |
35 | int error = param->is_delete ? -ENOENT : -ENOMEM; |
36 | struct tomoyo_acl_head *entry; |
37 | struct list_head *list = param->list; |
38 | |
39 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
40 | return -ENOMEM; |
41 | list_for_each_entry_rcu(entry, list, list) { |
42 | if (entry->is_deleted == TOMOYO_GC_IN_PROGRESS) |
43 | continue; |
44 | if (!check_duplicate(entry, new_entry)) |
45 | continue; |
46 | entry->is_deleted = param->is_delete; |
47 | error = 0; |
48 | break; |
49 | } |
50 | if (error && !param->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_same_acl_head - Check for duplicated "struct tomoyo_acl_info" entry. |
63 | * |
64 | * @a: Pointer to "struct tomoyo_acl_info". |
65 | * @b: Pointer to "struct tomoyo_acl_info". |
66 | * |
67 | * Returns true if @a == @b, false otherwise. |
68 | */ |
69 | static inline bool tomoyo_same_acl_head(const struct tomoyo_acl_info *a, |
70 | const struct tomoyo_acl_info *b) |
71 | { |
72 | return a->type == b->type && a->cond == b->cond; |
73 | } |
74 | |
75 | /** |
76 | * tomoyo_update_domain - Update an entry for domain policy. |
77 | * |
78 | * @new_entry: Pointer to "struct tomoyo_acl_info". |
79 | * @size: Size of @new_entry in bytes. |
80 | * @param: Pointer to "struct tomoyo_acl_param". |
81 | * @check_duplicate: Callback function to find duplicated entry. |
82 | * @merge_duplicate: Callback function to merge duplicated entry. |
83 | * |
84 | * Returns 0 on success, negative value otherwise. |
85 | * |
86 | * Caller holds tomoyo_read_lock(). |
87 | */ |
88 | int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size, |
89 | struct tomoyo_acl_param *param, |
90 | bool (*check_duplicate) (const struct tomoyo_acl_info |
91 | *, |
92 | const struct tomoyo_acl_info |
93 | *), |
94 | bool (*merge_duplicate) (struct tomoyo_acl_info *, |
95 | struct tomoyo_acl_info *, |
96 | const bool)) |
97 | { |
98 | const bool is_delete = param->is_delete; |
99 | int error = is_delete ? -ENOENT : -ENOMEM; |
100 | struct tomoyo_acl_info *entry; |
101 | struct list_head * const list = param->list; |
102 | |
103 | if (param->data[0]) { |
104 | new_entry->cond = tomoyo_get_condition(param); |
105 | if (!new_entry->cond) |
106 | return -EINVAL; |
107 | /* |
108 | * Domain transition preference is allowed for only |
109 | * "file execute" entries. |
110 | */ |
111 | if (new_entry->cond->transit && |
112 | !(new_entry->type == TOMOYO_TYPE_PATH_ACL && |
113 | container_of(new_entry, struct tomoyo_path_acl, head) |
114 | ->perm == 1 << TOMOYO_TYPE_EXECUTE)) |
115 | goto out; |
116 | } |
117 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
118 | goto out; |
119 | list_for_each_entry_rcu(entry, list, list) { |
120 | if (entry->is_deleted == TOMOYO_GC_IN_PROGRESS) |
121 | continue; |
122 | if (!tomoyo_same_acl_head(entry, new_entry) || |
123 | !check_duplicate(entry, new_entry)) |
124 | continue; |
125 | if (merge_duplicate) |
126 | entry->is_deleted = merge_duplicate(entry, new_entry, |
127 | is_delete); |
128 | else |
129 | entry->is_deleted = is_delete; |
130 | error = 0; |
131 | break; |
132 | } |
133 | if (error && !is_delete) { |
134 | entry = tomoyo_commit_ok(new_entry, size); |
135 | if (entry) { |
136 | list_add_tail_rcu(&entry->list, list); |
137 | error = 0; |
138 | } |
139 | } |
140 | mutex_unlock(&tomoyo_policy_lock); |
141 | out: |
142 | tomoyo_put_condition(new_entry->cond); |
143 | return error; |
144 | } |
145 | |
146 | /** |
147 | * tomoyo_check_acl - Do permission check. |
148 | * |
149 | * @r: Pointer to "struct tomoyo_request_info". |
150 | * @check_entry: Callback function to check type specific parameters. |
151 | * |
152 | * Returns 0 on success, negative value otherwise. |
153 | * |
154 | * Caller holds tomoyo_read_lock(). |
155 | */ |
156 | void tomoyo_check_acl(struct tomoyo_request_info *r, |
157 | bool (*check_entry) (struct tomoyo_request_info *, |
158 | const struct tomoyo_acl_info *)) |
159 | { |
160 | const struct tomoyo_domain_info *domain = r->domain; |
161 | struct tomoyo_acl_info *ptr; |
162 | bool retried = false; |
163 | const struct list_head *list = &domain->acl_info_list; |
164 | |
165 | retry: |
166 | list_for_each_entry_rcu(ptr, list, list) { |
167 | if (ptr->is_deleted || ptr->type != r->param_type) |
168 | continue; |
169 | if (!check_entry(r, ptr)) |
170 | continue; |
171 | if (!tomoyo_condition(r, ptr->cond)) |
172 | continue; |
173 | r->matched_acl = ptr; |
174 | r->granted = true; |
175 | return; |
176 | } |
177 | if (!retried) { |
178 | retried = true; |
179 | list = &domain->ns->acl_group[domain->group]; |
180 | goto retry; |
181 | } |
182 | r->granted = false; |
183 | } |
184 | |
185 | /* The list for "struct tomoyo_domain_info". */ |
186 | LIST_HEAD(tomoyo_domain_list); |
187 | |
188 | /** |
189 | * tomoyo_last_word - Get last component of a domainname. |
190 | * |
191 | * @name: Domainname to check. |
192 | * |
193 | * Returns the last word of @domainname. |
194 | */ |
195 | static const char *tomoyo_last_word(const char *name) |
196 | { |
197 | const char *cp = strrchr(name, ' '); |
198 | if (cp) |
199 | return cp + 1; |
200 | return name; |
201 | } |
202 | |
203 | /** |
204 | * tomoyo_same_transition_control - Check for duplicated "struct tomoyo_transition_control" entry. |
205 | * |
206 | * @a: Pointer to "struct tomoyo_acl_head". |
207 | * @b: Pointer to "struct tomoyo_acl_head". |
208 | * |
209 | * Returns true if @a == @b, false otherwise. |
210 | */ |
211 | static bool tomoyo_same_transition_control(const struct tomoyo_acl_head *a, |
212 | const struct tomoyo_acl_head *b) |
213 | { |
214 | const struct tomoyo_transition_control *p1 = container_of(a, |
215 | typeof(*p1), |
216 | head); |
217 | const struct tomoyo_transition_control *p2 = container_of(b, |
218 | typeof(*p2), |
219 | head); |
220 | return p1->type == p2->type && p1->is_last_name == p2->is_last_name |
221 | && p1->domainname == p2->domainname |
222 | && p1->program == p2->program; |
223 | } |
224 | |
225 | /** |
226 | * tomoyo_write_transition_control - Write "struct tomoyo_transition_control" list. |
227 | * |
228 | * @param: Pointer to "struct tomoyo_acl_param". |
229 | * @type: Type of this entry. |
230 | * |
231 | * Returns 0 on success, negative value otherwise. |
232 | */ |
233 | int tomoyo_write_transition_control(struct tomoyo_acl_param *param, |
234 | const u8 type) |
235 | { |
236 | struct tomoyo_transition_control e = { .type = type }; |
237 | int error = param->is_delete ? -ENOENT : -ENOMEM; |
238 | char *program = param->data; |
239 | char *domainname = strstr(program, " from "); |
240 | if (domainname) { |
241 | *domainname = '\0'; |
242 | domainname += 6; |
243 | } else if (type == TOMOYO_TRANSITION_CONTROL_NO_KEEP || |
244 | type == TOMOYO_TRANSITION_CONTROL_KEEP) { |
245 | domainname = program; |
246 | program = NULL; |
247 | } |
248 | if (program && strcmp(program, "any")) { |
249 | if (!tomoyo_correct_path(program)) |
250 | return -EINVAL; |
251 | e.program = tomoyo_get_name(program); |
252 | if (!e.program) |
253 | goto out; |
254 | } |
255 | if (domainname && strcmp(domainname, "any")) { |
256 | if (!tomoyo_correct_domain(domainname)) { |
257 | if (!tomoyo_correct_path(domainname)) |
258 | goto out; |
259 | e.is_last_name = true; |
260 | } |
261 | e.domainname = tomoyo_get_name(domainname); |
262 | if (!e.domainname) |
263 | goto out; |
264 | } |
265 | param->list = ¶m->ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL]; |
266 | error = tomoyo_update_policy(&e.head, sizeof(e), param, |
267 | tomoyo_same_transition_control); |
268 | out: |
269 | tomoyo_put_name(e.domainname); |
270 | tomoyo_put_name(e.program); |
271 | return error; |
272 | } |
273 | |
274 | /** |
275 | * tomoyo_scan_transition - Try to find specific domain transition type. |
276 | * |
277 | * @list: Pointer to "struct list_head". |
278 | * @domainname: The name of current domain. |
279 | * @program: The name of requested program. |
280 | * @last_name: The last component of @domainname. |
281 | * @type: One of values in "enum tomoyo_transition_type". |
282 | * |
283 | * Returns true if found one, false otherwise. |
284 | * |
285 | * Caller holds tomoyo_read_lock(). |
286 | */ |
287 | static inline bool tomoyo_scan_transition |
288 | (const struct list_head *list, const struct tomoyo_path_info *domainname, |
289 | const struct tomoyo_path_info *program, const char *last_name, |
290 | const enum tomoyo_transition_type type) |
291 | { |
292 | const struct tomoyo_transition_control *ptr; |
293 | list_for_each_entry_rcu(ptr, list, head.list) { |
294 | if (ptr->head.is_deleted || ptr->type != type) |
295 | continue; |
296 | if (ptr->domainname) { |
297 | if (!ptr->is_last_name) { |
298 | if (ptr->domainname != domainname) |
299 | continue; |
300 | } else { |
301 | /* |
302 | * Use direct strcmp() since this is |
303 | * unlikely used. |
304 | */ |
305 | if (strcmp(ptr->domainname->name, last_name)) |
306 | continue; |
307 | } |
308 | } |
309 | if (ptr->program && tomoyo_pathcmp(ptr->program, program)) |
310 | continue; |
311 | return true; |
312 | } |
313 | return false; |
314 | } |
315 | |
316 | /** |
317 | * tomoyo_transition_type - Get domain transition type. |
318 | * |
319 | * @ns: Pointer to "struct tomoyo_policy_namespace". |
320 | * @domainname: The name of current domain. |
321 | * @program: The name of requested program. |
322 | * |
323 | * Returns TOMOYO_TRANSITION_CONTROL_TRANSIT if executing @program causes |
324 | * domain transition across namespaces, TOMOYO_TRANSITION_CONTROL_INITIALIZE if |
325 | * executing @program reinitializes domain transition within that namespace, |
326 | * TOMOYO_TRANSITION_CONTROL_KEEP if executing @program stays at @domainname , |
327 | * others otherwise. |
328 | * |
329 | * Caller holds tomoyo_read_lock(). |
330 | */ |
331 | static enum tomoyo_transition_type tomoyo_transition_type |
332 | (const struct tomoyo_policy_namespace *ns, |
333 | const struct tomoyo_path_info *domainname, |
334 | const struct tomoyo_path_info *program) |
335 | { |
336 | const char *last_name = tomoyo_last_word(domainname->name); |
337 | enum tomoyo_transition_type type = TOMOYO_TRANSITION_CONTROL_NO_RESET; |
338 | while (type < TOMOYO_MAX_TRANSITION_TYPE) { |
339 | const struct list_head * const list = |
340 | &ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL]; |
341 | if (!tomoyo_scan_transition(list, domainname, program, |
342 | last_name, type)) { |
343 | type++; |
344 | continue; |
345 | } |
346 | if (type != TOMOYO_TRANSITION_CONTROL_NO_RESET && |
347 | type != TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE) |
348 | break; |
349 | /* |
350 | * Do not check for reset_domain if no_reset_domain matched. |
351 | * Do not check for initialize_domain if no_initialize_domain |
352 | * matched. |
353 | */ |
354 | type++; |
355 | type++; |
356 | } |
357 | return type; |
358 | } |
359 | |
360 | /** |
361 | * tomoyo_same_aggregator - Check for duplicated "struct tomoyo_aggregator" entry. |
362 | * |
363 | * @a: Pointer to "struct tomoyo_acl_head". |
364 | * @b: Pointer to "struct tomoyo_acl_head". |
365 | * |
366 | * Returns true if @a == @b, false otherwise. |
367 | */ |
368 | static bool tomoyo_same_aggregator(const struct tomoyo_acl_head *a, |
369 | const struct tomoyo_acl_head *b) |
370 | { |
371 | const struct tomoyo_aggregator *p1 = container_of(a, typeof(*p1), |
372 | head); |
373 | const struct tomoyo_aggregator *p2 = container_of(b, typeof(*p2), |
374 | head); |
375 | return p1->original_name == p2->original_name && |
376 | p1->aggregated_name == p2->aggregated_name; |
377 | } |
378 | |
379 | /** |
380 | * tomoyo_write_aggregator - Write "struct tomoyo_aggregator" list. |
381 | * |
382 | * @param: Pointer to "struct tomoyo_acl_param". |
383 | * |
384 | * Returns 0 on success, negative value otherwise. |
385 | * |
386 | * Caller holds tomoyo_read_lock(). |
387 | */ |
388 | int tomoyo_write_aggregator(struct tomoyo_acl_param *param) |
389 | { |
390 | struct tomoyo_aggregator e = { }; |
391 | int error = param->is_delete ? -ENOENT : -ENOMEM; |
392 | const char *original_name = tomoyo_read_token(param); |
393 | const char *aggregated_name = tomoyo_read_token(param); |
394 | if (!tomoyo_correct_word(original_name) || |
395 | !tomoyo_correct_path(aggregated_name)) |
396 | return -EINVAL; |
397 | e.original_name = tomoyo_get_name(original_name); |
398 | e.aggregated_name = tomoyo_get_name(aggregated_name); |
399 | if (!e.original_name || !e.aggregated_name || |
400 | e.aggregated_name->is_patterned) /* No patterns allowed. */ |
401 | goto out; |
402 | param->list = ¶m->ns->policy_list[TOMOYO_ID_AGGREGATOR]; |
403 | error = tomoyo_update_policy(&e.head, sizeof(e), param, |
404 | tomoyo_same_aggregator); |
405 | out: |
406 | tomoyo_put_name(e.original_name); |
407 | tomoyo_put_name(e.aggregated_name); |
408 | return error; |
409 | } |
410 | |
411 | /** |
412 | * tomoyo_find_namespace - Find specified namespace. |
413 | * |
414 | * @name: Name of namespace to find. |
415 | * @len: Length of @name. |
416 | * |
417 | * Returns pointer to "struct tomoyo_policy_namespace" if found, |
418 | * NULL otherwise. |
419 | * |
420 | * Caller holds tomoyo_read_lock(). |
421 | */ |
422 | static struct tomoyo_policy_namespace *tomoyo_find_namespace |
423 | (const char *name, const unsigned int len) |
424 | { |
425 | struct tomoyo_policy_namespace *ns; |
426 | list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) { |
427 | if (strncmp(name, ns->name, len) || |
428 | (name[len] && name[len] != ' ')) |
429 | continue; |
430 | return ns; |
431 | } |
432 | return NULL; |
433 | } |
434 | |
435 | /** |
436 | * tomoyo_assign_namespace - Create a new namespace. |
437 | * |
438 | * @domainname: Name of namespace to create. |
439 | * |
440 | * Returns pointer to "struct tomoyo_policy_namespace" on success, |
441 | * NULL otherwise. |
442 | * |
443 | * Caller holds tomoyo_read_lock(). |
444 | */ |
445 | struct tomoyo_policy_namespace *tomoyo_assign_namespace(const char *domainname) |
446 | { |
447 | struct tomoyo_policy_namespace *ptr; |
448 | struct tomoyo_policy_namespace *entry; |
449 | const char *cp = domainname; |
450 | unsigned int len = 0; |
451 | while (*cp && *cp++ != ' ') |
452 | len++; |
453 | ptr = tomoyo_find_namespace(domainname, len); |
454 | if (ptr) |
455 | return ptr; |
456 | if (len >= TOMOYO_EXEC_TMPSIZE - 10 || !tomoyo_domain_def(domainname)) |
457 | return NULL; |
458 | entry = kzalloc(sizeof(*entry) + len + 1, GFP_NOFS); |
459 | if (!entry) |
460 | return NULL; |
461 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
462 | goto out; |
463 | ptr = tomoyo_find_namespace(domainname, len); |
464 | if (!ptr && tomoyo_memory_ok(entry)) { |
465 | char *name = (char *) (entry + 1); |
466 | ptr = entry; |
467 | memmove(name, domainname, len); |
468 | name[len] = '\0'; |
469 | entry->name = name; |
470 | tomoyo_init_policy_namespace(entry); |
471 | entry = NULL; |
472 | } |
473 | mutex_unlock(&tomoyo_policy_lock); |
474 | out: |
475 | kfree(entry); |
476 | return ptr; |
477 | } |
478 | |
479 | /** |
480 | * tomoyo_namespace_jump - Check for namespace jump. |
481 | * |
482 | * @domainname: Name of domain. |
483 | * |
484 | * Returns true if namespace differs, false otherwise. |
485 | */ |
486 | static bool tomoyo_namespace_jump(const char *domainname) |
487 | { |
488 | const char *namespace = tomoyo_current_namespace()->name; |
489 | const int len = strlen(namespace); |
490 | return strncmp(domainname, namespace, len) || |
491 | (domainname[len] && domainname[len] != ' '); |
492 | } |
493 | |
494 | /** |
495 | * tomoyo_assign_domain - Create a domain or a namespace. |
496 | * |
497 | * @domainname: The name of domain. |
498 | * @transit: True if transit to domain found or created. |
499 | * |
500 | * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise. |
501 | * |
502 | * Caller holds tomoyo_read_lock(). |
503 | */ |
504 | struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname, |
505 | const bool transit) |
506 | { |
507 | struct tomoyo_domain_info e = { }; |
508 | struct tomoyo_domain_info *entry = tomoyo_find_domain(domainname); |
509 | bool created = false; |
510 | if (entry) { |
511 | if (transit) { |
512 | /* |
513 | * Since namespace is created at runtime, profiles may |
514 | * not be created by the moment the process transits to |
515 | * that domain. Do not perform domain transition if |
516 | * profile for that domain is not yet created. |
517 | */ |
518 | if (tomoyo_policy_loaded && |
519 | !entry->ns->profile_ptr[entry->profile]) |
520 | return NULL; |
521 | } |
522 | return entry; |
523 | } |
524 | /* Requested domain does not exist. */ |
525 | /* Don't create requested domain if domainname is invalid. */ |
526 | if (strlen(domainname) >= TOMOYO_EXEC_TMPSIZE - 10 || |
527 | !tomoyo_correct_domain(domainname)) |
528 | return NULL; |
529 | /* |
530 | * Since definition of profiles and acl_groups may differ across |
531 | * namespaces, do not inherit "use_profile" and "use_group" settings |
532 | * by automatically creating requested domain upon domain transition. |
533 | */ |
534 | if (transit && tomoyo_namespace_jump(domainname)) |
535 | return NULL; |
536 | e.ns = tomoyo_assign_namespace(domainname); |
537 | if (!e.ns) |
538 | return NULL; |
539 | /* |
540 | * "use_profile" and "use_group" settings for automatically created |
541 | * domains are inherited from current domain. These are 0 for manually |
542 | * created domains. |
543 | */ |
544 | if (transit) { |
545 | const struct tomoyo_domain_info *domain = tomoyo_domain(); |
546 | e.profile = domain->profile; |
547 | e.group = domain->group; |
548 | } |
549 | e.domainname = tomoyo_get_name(domainname); |
550 | if (!e.domainname) |
551 | return NULL; |
552 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
553 | goto out; |
554 | entry = tomoyo_find_domain(domainname); |
555 | if (!entry) { |
556 | entry = tomoyo_commit_ok(&e, sizeof(e)); |
557 | if (entry) { |
558 | INIT_LIST_HEAD(&entry->acl_info_list); |
559 | list_add_tail_rcu(&entry->list, &tomoyo_domain_list); |
560 | created = true; |
561 | } |
562 | } |
563 | mutex_unlock(&tomoyo_policy_lock); |
564 | out: |
565 | tomoyo_put_name(e.domainname); |
566 | if (entry && transit) { |
567 | if (created) { |
568 | struct tomoyo_request_info r; |
569 | tomoyo_init_request_info(&r, entry, |
570 | TOMOYO_MAC_FILE_EXECUTE); |
571 | r.granted = false; |
572 | tomoyo_write_log(&r, "use_profile %u\n", |
573 | entry->profile); |
574 | tomoyo_write_log(&r, "use_group %u\n", entry->group); |
575 | tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES); |
576 | } |
577 | } |
578 | return entry; |
579 | } |
580 | |
581 | /** |
582 | * tomoyo_environ - Check permission for environment variable names. |
583 | * |
584 | * @ee: Pointer to "struct tomoyo_execve". |
585 | * |
586 | * Returns 0 on success, negative value otherwise. |
587 | */ |
588 | static int tomoyo_environ(struct tomoyo_execve *ee) |
589 | { |
590 | struct tomoyo_request_info *r = &ee->r; |
591 | struct linux_binprm *bprm = ee->bprm; |
592 | /* env_page.data is allocated by tomoyo_dump_page(). */ |
593 | struct tomoyo_page_dump env_page = { }; |
594 | char *arg_ptr; /* Size is TOMOYO_EXEC_TMPSIZE bytes */ |
595 | int arg_len = 0; |
596 | unsigned long pos = bprm->p; |
597 | int offset = pos % PAGE_SIZE; |
598 | int argv_count = bprm->argc; |
599 | int envp_count = bprm->envc; |
600 | int error = -ENOMEM; |
601 | |
602 | ee->r.type = TOMOYO_MAC_ENVIRON; |
603 | ee->r.profile = r->domain->profile; |
604 | ee->r.mode = tomoyo_get_mode(r->domain->ns, ee->r.profile, |
605 | TOMOYO_MAC_ENVIRON); |
606 | if (!r->mode || !envp_count) |
607 | return 0; |
608 | arg_ptr = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS); |
609 | if (!arg_ptr) |
610 | goto out; |
611 | while (error == -ENOMEM) { |
612 | if (!tomoyo_dump_page(bprm, pos, &env_page)) |
613 | goto out; |
614 | pos += PAGE_SIZE - offset; |
615 | /* Read. */ |
616 | while (argv_count && offset < PAGE_SIZE) { |
617 | if (!env_page.data[offset++]) |
618 | argv_count--; |
619 | } |
620 | if (argv_count) { |
621 | offset = 0; |
622 | continue; |
623 | } |
624 | while (offset < PAGE_SIZE) { |
625 | const unsigned char c = env_page.data[offset++]; |
626 | |
627 | if (c && arg_len < TOMOYO_EXEC_TMPSIZE - 10) { |
628 | if (c == '=') { |
629 | arg_ptr[arg_len++] = '\0'; |
630 | } else if (c == '\\') { |
631 | arg_ptr[arg_len++] = '\\'; |
632 | arg_ptr[arg_len++] = '\\'; |
633 | } else if (c > ' ' && c < 127) { |
634 | arg_ptr[arg_len++] = c; |
635 | } else { |
636 | arg_ptr[arg_len++] = '\\'; |
637 | arg_ptr[arg_len++] = (c >> 6) + '0'; |
638 | arg_ptr[arg_len++] |
639 | = ((c >> 3) & 7) + '0'; |
640 | arg_ptr[arg_len++] = (c & 7) + '0'; |
641 | } |
642 | } else { |
643 | arg_ptr[arg_len] = '\0'; |
644 | } |
645 | if (c) |
646 | continue; |
647 | if (tomoyo_env_perm(r, arg_ptr)) { |
648 | error = -EPERM; |
649 | break; |
650 | } |
651 | if (!--envp_count) { |
652 | error = 0; |
653 | break; |
654 | } |
655 | arg_len = 0; |
656 | } |
657 | offset = 0; |
658 | } |
659 | out: |
660 | if (r->mode != TOMOYO_CONFIG_ENFORCING) |
661 | error = 0; |
662 | kfree(env_page.data); |
663 | kfree(arg_ptr); |
664 | return error; |
665 | } |
666 | |
667 | /** |
668 | * tomoyo_find_next_domain - Find a domain. |
669 | * |
670 | * @bprm: Pointer to "struct linux_binprm". |
671 | * |
672 | * Returns 0 on success, negative value otherwise. |
673 | * |
674 | * Caller holds tomoyo_read_lock(). |
675 | */ |
676 | int tomoyo_find_next_domain(struct linux_binprm *bprm) |
677 | { |
678 | struct tomoyo_domain_info *old_domain = tomoyo_domain(); |
679 | struct tomoyo_domain_info *domain = NULL; |
680 | const char *original_name = bprm->filename; |
681 | int retval = -ENOMEM; |
682 | bool reject_on_transition_failure = false; |
683 | const struct tomoyo_path_info *candidate; |
684 | struct tomoyo_path_info exename; |
685 | struct tomoyo_execve *ee = kzalloc(sizeof(*ee), GFP_NOFS); |
686 | |
687 | if (!ee) |
688 | return -ENOMEM; |
689 | ee->tmp = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS); |
690 | if (!ee->tmp) { |
691 | kfree(ee); |
692 | return -ENOMEM; |
693 | } |
694 | /* ee->dump->data is allocated by tomoyo_dump_page(). */ |
695 | tomoyo_init_request_info(&ee->r, NULL, TOMOYO_MAC_FILE_EXECUTE); |
696 | ee->r.ee = ee; |
697 | ee->bprm = bprm; |
698 | ee->r.obj = &ee->obj; |
699 | ee->obj.path1 = bprm->file->f_path; |
700 | /* Get symlink's pathname of program. */ |
701 | retval = -ENOENT; |
702 | exename.name = tomoyo_realpath_nofollow(original_name); |
703 | if (!exename.name) |
704 | goto out; |
705 | tomoyo_fill_path_info(&exename); |
706 | retry: |
707 | /* Check 'aggregator' directive. */ |
708 | { |
709 | struct tomoyo_aggregator *ptr; |
710 | struct list_head *list = |
711 | &old_domain->ns->policy_list[TOMOYO_ID_AGGREGATOR]; |
712 | /* Check 'aggregator' directive. */ |
713 | candidate = &exename; |
714 | list_for_each_entry_rcu(ptr, list, head.list) { |
715 | if (ptr->head.is_deleted || |
716 | !tomoyo_path_matches_pattern(&exename, |
717 | ptr->original_name)) |
718 | continue; |
719 | candidate = ptr->aggregated_name; |
720 | break; |
721 | } |
722 | } |
723 | |
724 | /* Check execute permission. */ |
725 | retval = tomoyo_execute_permission(&ee->r, candidate); |
726 | if (retval == TOMOYO_RETRY_REQUEST) |
727 | goto retry; |
728 | if (retval < 0) |
729 | goto out; |
730 | /* |
731 | * To be able to specify domainnames with wildcards, use the |
732 | * pathname specified in the policy (which may contain |
733 | * wildcard) rather than the pathname passed to execve() |
734 | * (which never contains wildcard). |
735 | */ |
736 | if (ee->r.param.path.matched_path) |
737 | candidate = ee->r.param.path.matched_path; |
738 | |
739 | /* |
740 | * Check for domain transition preference if "file execute" matched. |
741 | * If preference is given, make do_execve() fail if domain transition |
742 | * has failed, for domain transition preference should be used with |
743 | * destination domain defined. |
744 | */ |
745 | if (ee->transition) { |
746 | const char *domainname = ee->transition->name; |
747 | reject_on_transition_failure = true; |
748 | if (!strcmp(domainname, "keep")) |
749 | goto force_keep_domain; |
750 | if (!strcmp(domainname, "child")) |
751 | goto force_child_domain; |
752 | if (!strcmp(domainname, "reset")) |
753 | goto force_reset_domain; |
754 | if (!strcmp(domainname, "initialize")) |
755 | goto force_initialize_domain; |
756 | if (!strcmp(domainname, "parent")) { |
757 | char *cp; |
758 | strncpy(ee->tmp, old_domain->domainname->name, |
759 | TOMOYO_EXEC_TMPSIZE - 1); |
760 | cp = strrchr(ee->tmp, ' '); |
761 | if (cp) |
762 | *cp = '\0'; |
763 | } else if (*domainname == '<') |
764 | strncpy(ee->tmp, domainname, TOMOYO_EXEC_TMPSIZE - 1); |
765 | else |
766 | snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s", |
767 | old_domain->domainname->name, domainname); |
768 | goto force_jump_domain; |
769 | } |
770 | /* |
771 | * No domain transition preference specified. |
772 | * Calculate domain to transit to. |
773 | */ |
774 | switch (tomoyo_transition_type(old_domain->ns, old_domain->domainname, |
775 | candidate)) { |
776 | case TOMOYO_TRANSITION_CONTROL_RESET: |
777 | force_reset_domain: |
778 | /* Transit to the root of specified namespace. */ |
779 | snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "<%s>", |
780 | candidate->name); |
781 | /* |
782 | * Make do_execve() fail if domain transition across namespaces |
783 | * has failed. |
784 | */ |
785 | reject_on_transition_failure = true; |
786 | break; |
787 | case TOMOYO_TRANSITION_CONTROL_INITIALIZE: |
788 | force_initialize_domain: |
789 | /* Transit to the child of current namespace's root. */ |
790 | snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s", |
791 | old_domain->ns->name, candidate->name); |
792 | break; |
793 | case TOMOYO_TRANSITION_CONTROL_KEEP: |
794 | force_keep_domain: |
795 | /* Keep current domain. */ |
796 | domain = old_domain; |
797 | break; |
798 | default: |
799 | if (old_domain == &tomoyo_kernel_domain && |
800 | !tomoyo_policy_loaded) { |
801 | /* |
802 | * Needn't to transit from kernel domain before |
803 | * starting /sbin/init. But transit from kernel domain |
804 | * if executing initializers because they might start |
805 | * before /sbin/init. |
806 | */ |
807 | domain = old_domain; |
808 | break; |
809 | } |
810 | force_child_domain: |
811 | /* Normal domain transition. */ |
812 | snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s", |
813 | old_domain->domainname->name, candidate->name); |
814 | break; |
815 | } |
816 | force_jump_domain: |
817 | if (!domain) |
818 | domain = tomoyo_assign_domain(ee->tmp, true); |
819 | if (domain) |
820 | retval = 0; |
821 | else if (reject_on_transition_failure) { |
822 | printk(KERN_WARNING "ERROR: Domain '%s' not ready.\n", |
823 | ee->tmp); |
824 | retval = -ENOMEM; |
825 | } else if (ee->r.mode == TOMOYO_CONFIG_ENFORCING) |
826 | retval = -ENOMEM; |
827 | else { |
828 | retval = 0; |
829 | if (!old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED]) { |
830 | old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED] = true; |
831 | ee->r.granted = false; |
832 | tomoyo_write_log(&ee->r, "%s", tomoyo_dif |
833 | [TOMOYO_DIF_TRANSITION_FAILED]); |
834 | printk(KERN_WARNING |
835 | "ERROR: Domain '%s' not defined.\n", ee->tmp); |
836 | } |
837 | } |
838 | out: |
839 | if (!domain) |
840 | domain = old_domain; |
841 | /* Update reference count on "struct tomoyo_domain_info". */ |
842 | atomic_inc(&domain->users); |
843 | bprm->cred->security = domain; |
844 | kfree(exename.name); |
845 | if (!retval) { |
846 | ee->r.domain = domain; |
847 | retval = tomoyo_environ(ee); |
848 | } |
849 | kfree(ee->tmp); |
850 | kfree(ee->dump.data); |
851 | kfree(ee); |
852 | return retval; |
853 | } |
854 | |
855 | /** |
856 | * tomoyo_dump_page - Dump a page to buffer. |
857 | * |
858 | * @bprm: Pointer to "struct linux_binprm". |
859 | * @pos: Location to dump. |
860 | * @dump: Poiner to "struct tomoyo_page_dump". |
861 | * |
862 | * Returns true on success, false otherwise. |
863 | */ |
864 | bool tomoyo_dump_page(struct linux_binprm *bprm, unsigned long pos, |
865 | struct tomoyo_page_dump *dump) |
866 | { |
867 | struct page *page; |
868 | |
869 | /* dump->data is released by tomoyo_find_next_domain(). */ |
870 | if (!dump->data) { |
871 | dump->data = kzalloc(PAGE_SIZE, GFP_NOFS); |
872 | if (!dump->data) |
873 | return false; |
874 | } |
875 | /* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */ |
876 | #ifdef CONFIG_MMU |
877 | if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) |
878 | return false; |
879 | #else |
880 | page = bprm->page[pos / PAGE_SIZE]; |
881 | #endif |
882 | if (page != dump->page) { |
883 | const unsigned int offset = pos % PAGE_SIZE; |
884 | /* |
885 | * Maybe kmap()/kunmap() should be used here. |
886 | * But remove_arg_zero() uses kmap_atomic()/kunmap_atomic(). |
887 | * So do I. |
888 | */ |
889 | char *kaddr = kmap_atomic(page); |
890 | |
891 | dump->page = page; |
892 | memcpy(dump->data + offset, kaddr + offset, |
893 | PAGE_SIZE - offset); |
894 | kunmap_atomic(kaddr); |
895 | } |
896 | /* Same with put_arg_page(page) in fs/exec.c */ |
897 | #ifdef CONFIG_MMU |
898 | put_page(page); |
899 | #endif |
900 | return true; |
901 | } |
902 |
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Tags:
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v2.6.34-rc5
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