2 * security/tomoyo/domain.c
4 * Domain transition functions for TOMOYO.
6 * Copyright (C) 2005-2010 NTT DATA CORPORATION
10 #include <linux/binfmts.h>
11 #include <linux/slab.h>
13 /* Variables definitions.*/
15 /* The initial domain. */
16 struct tomoyo_domain_info tomoyo_kernel_domain
;
19 * tomoyo_update_policy - Update an entry for exception policy.
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.
27 * Returns 0 on success, negative value otherwise.
29 * Caller holds tomoyo_read_lock().
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
35 const struct tomoyo_acl_head
38 int error
= is_delete
? -ENOENT
: -ENOMEM
;
39 struct tomoyo_acl_head
*entry
;
41 if (mutex_lock_interruptible(&tomoyo_policy_lock
))
43 list_for_each_entry_rcu(entry
, list
, list
) {
44 if (!check_duplicate(entry
, new_entry
))
46 entry
->is_deleted
= is_delete
;
50 if (error
&& !is_delete
) {
51 entry
= tomoyo_commit_ok(new_entry
, size
);
53 list_add_tail_rcu(&entry
->list
, list
);
57 mutex_unlock(&tomoyo_policy_lock
);
62 * tomoyo_update_domain - Update an entry for domain policy.
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.
71 * Returns 0 on success, negative value otherwise.
73 * Caller holds tomoyo_read_lock().
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
79 const struct tomoyo_acl_info
81 bool (*merge_duplicate
) (struct tomoyo_acl_info
*,
82 struct tomoyo_acl_info
*,
85 int error
= is_delete
? -ENOENT
: -ENOMEM
;
86 struct tomoyo_acl_info
*entry
;
88 if (mutex_lock_interruptible(&tomoyo_policy_lock
))
90 list_for_each_entry_rcu(entry
, &domain
->acl_info_list
, list
) {
91 if (!check_duplicate(entry
, new_entry
))
94 entry
->is_deleted
= merge_duplicate(entry
, new_entry
,
97 entry
->is_deleted
= is_delete
;
101 if (error
&& !is_delete
) {
102 entry
= tomoyo_commit_ok(new_entry
, size
);
104 list_add_tail_rcu(&entry
->list
, &domain
->acl_info_list
);
108 mutex_unlock(&tomoyo_policy_lock
);
112 void tomoyo_check_acl(struct tomoyo_request_info
*r
,
113 bool (*check_entry
) (const struct tomoyo_request_info
*,
114 const struct tomoyo_acl_info
*))
116 const struct tomoyo_domain_info
*domain
= r
->domain
;
117 struct tomoyo_acl_info
*ptr
;
119 list_for_each_entry_rcu(ptr
, &domain
->acl_info_list
, list
) {
120 if (ptr
->is_deleted
|| ptr
->type
!= r
->param_type
)
122 if (check_entry(r
, ptr
)) {
130 /* The list for "struct tomoyo_domain_info". */
131 LIST_HEAD(tomoyo_domain_list
);
133 struct list_head tomoyo_policy_list
[TOMOYO_MAX_POLICY
];
134 struct list_head tomoyo_group_list
[TOMOYO_MAX_GROUP
];
137 * tomoyo_get_last_name - Get last component of a domainname.
139 * @domain: Pointer to "struct tomoyo_domain_info".
141 * Returns the last component of the domainname.
143 const char *tomoyo_get_last_name(const struct tomoyo_domain_info
*domain
)
145 const char *cp0
= domain
->domainname
->name
;
146 const char *cp1
= strrchr(cp0
, ' ');
153 static bool tomoyo_same_domain_initializer_entry(const struct tomoyo_acl_head
*
155 const struct tomoyo_acl_head
*
158 const struct tomoyo_domain_initializer_entry
*p1
=
159 container_of(a
, typeof(*p1
), head
);
160 const struct tomoyo_domain_initializer_entry
*p2
=
161 container_of(b
, typeof(*p2
), head
);
162 return p1
->is_not
== p2
->is_not
&& p1
->is_last_name
== p2
->is_last_name
163 && p1
->domainname
== p2
->domainname
164 && p1
->program
== p2
->program
;
168 * tomoyo_update_domain_initializer_entry - Update "struct tomoyo_domain_initializer_entry" list.
170 * @domainname: The name of domain. May be NULL.
171 * @program: The name of program.
172 * @is_not: True if it is "no_initialize_domain" entry.
173 * @is_delete: True if it is a delete request.
175 * Returns 0 on success, negative value otherwise.
177 * Caller holds tomoyo_read_lock().
179 static int tomoyo_update_domain_initializer_entry(const char *domainname
,
182 const bool is_delete
)
184 struct tomoyo_domain_initializer_entry e
= { .is_not
= is_not
};
185 int error
= is_delete
? -ENOENT
: -ENOMEM
;
187 if (!tomoyo_correct_path(program
))
190 if (!tomoyo_domain_def(domainname
) &&
191 tomoyo_correct_path(domainname
))
192 e
.is_last_name
= true;
193 else if (!tomoyo_correct_domain(domainname
))
195 e
.domainname
= tomoyo_get_name(domainname
);
199 e
.program
= tomoyo_get_name(program
);
202 error
= tomoyo_update_policy(&e
.head
, sizeof(e
), is_delete
,
204 [TOMOYO_ID_DOMAIN_INITIALIZER
],
205 tomoyo_same_domain_initializer_entry
);
207 tomoyo_put_name(e
.domainname
);
208 tomoyo_put_name(e
.program
);
213 * tomoyo_write_domain_initializer_policy - Write "struct tomoyo_domain_initializer_entry" list.
215 * @data: String to parse.
216 * @is_not: True if it is "no_initialize_domain" entry.
217 * @is_delete: True if it is a delete request.
219 * Returns 0 on success, negative value otherwise.
221 * Caller holds tomoyo_read_lock().
223 int tomoyo_write_domain_initializer_policy(char *data
, const bool is_not
,
224 const bool is_delete
)
226 char *cp
= strstr(data
, " from ");
230 return tomoyo_update_domain_initializer_entry(cp
+ 6, data
,
234 return tomoyo_update_domain_initializer_entry(NULL
, data
, is_not
,
239 * tomoyo_domain_initializer - Check whether the given program causes domainname reinitialization.
241 * @domainname: The name of domain.
242 * @program: The name of program.
243 * @last_name: The last component of @domainname.
245 * Returns true if executing @program reinitializes domain transition,
248 * Caller holds tomoyo_read_lock().
250 static bool tomoyo_domain_initializer(const struct tomoyo_path_info
*
252 const struct tomoyo_path_info
*program
,
253 const struct tomoyo_path_info
*
256 struct tomoyo_domain_initializer_entry
*ptr
;
259 list_for_each_entry_rcu(ptr
, &tomoyo_policy_list
260 [TOMOYO_ID_DOMAIN_INITIALIZER
], head
.list
) {
261 if (ptr
->head
.is_deleted
)
263 if (ptr
->domainname
) {
264 if (!ptr
->is_last_name
) {
265 if (ptr
->domainname
!= domainname
)
268 if (tomoyo_pathcmp(ptr
->domainname
, last_name
))
272 if (tomoyo_pathcmp(ptr
->program
, program
))
283 static bool tomoyo_same_domain_keeper_entry(const struct tomoyo_acl_head
*a
,
284 const struct tomoyo_acl_head
*b
)
286 const struct tomoyo_domain_keeper_entry
*p1
=
287 container_of(a
, typeof(*p1
), head
);
288 const struct tomoyo_domain_keeper_entry
*p2
=
289 container_of(b
, typeof(*p2
), head
);
290 return p1
->is_not
== p2
->is_not
&& p1
->is_last_name
== p2
->is_last_name
291 && p1
->domainname
== p2
->domainname
292 && p1
->program
== p2
->program
;
296 * tomoyo_update_domain_keeper_entry - Update "struct tomoyo_domain_keeper_entry" list.
298 * @domainname: The name of domain.
299 * @program: The name of program. May be NULL.
300 * @is_not: True if it is "no_keep_domain" entry.
301 * @is_delete: True if it is a delete request.
303 * Returns 0 on success, negative value otherwise.
305 * Caller holds tomoyo_read_lock().
307 static int tomoyo_update_domain_keeper_entry(const char *domainname
,
310 const bool is_delete
)
312 struct tomoyo_domain_keeper_entry e
= { .is_not
= is_not
};
313 int error
= is_delete
? -ENOENT
: -ENOMEM
;
315 if (!tomoyo_domain_def(domainname
) &&
316 tomoyo_correct_path(domainname
))
317 e
.is_last_name
= true;
318 else if (!tomoyo_correct_domain(domainname
))
321 if (!tomoyo_correct_path(program
))
323 e
.program
= tomoyo_get_name(program
);
327 e
.domainname
= tomoyo_get_name(domainname
);
330 error
= tomoyo_update_policy(&e
.head
, sizeof(e
), is_delete
,
332 [TOMOYO_ID_DOMAIN_KEEPER
],
333 tomoyo_same_domain_keeper_entry
);
335 tomoyo_put_name(e
.domainname
);
336 tomoyo_put_name(e
.program
);
341 * tomoyo_write_domain_keeper_policy - Write "struct tomoyo_domain_keeper_entry" list.
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.
347 * Caller holds tomoyo_read_lock().
349 int tomoyo_write_domain_keeper_policy(char *data
, const bool is_not
,
350 const bool is_delete
)
352 char *cp
= strstr(data
, " from ");
356 return tomoyo_update_domain_keeper_entry(cp
+ 6, data
, is_not
,
359 return tomoyo_update_domain_keeper_entry(data
, NULL
, is_not
, is_delete
);
363 * tomoyo_domain_keeper - Check whether the given program causes domain transition suppression.
365 * @domainname: The name of domain.
366 * @program: The name of program.
367 * @last_name: The last component of @domainname.
369 * Returns true if executing @program supresses domain transition,
372 * Caller holds tomoyo_read_lock().
374 static bool tomoyo_domain_keeper(const struct tomoyo_path_info
*domainname
,
375 const struct tomoyo_path_info
*program
,
376 const struct tomoyo_path_info
*last_name
)
378 struct tomoyo_domain_keeper_entry
*ptr
;
381 list_for_each_entry_rcu(ptr
,
382 &tomoyo_policy_list
[TOMOYO_ID_DOMAIN_KEEPER
],
384 if (ptr
->head
.is_deleted
)
386 if (!ptr
->is_last_name
) {
387 if (ptr
->domainname
!= domainname
)
390 if (tomoyo_pathcmp(ptr
->domainname
, last_name
))
393 if (ptr
->program
&& tomoyo_pathcmp(ptr
->program
, program
))
404 static bool tomoyo_same_aggregator_entry(const struct tomoyo_acl_head
*a
,
405 const struct tomoyo_acl_head
*b
)
407 const struct tomoyo_aggregator_entry
*p1
= container_of(a
, typeof(*p1
),
409 const struct tomoyo_aggregator_entry
*p2
= container_of(b
, typeof(*p2
),
411 return p1
->original_name
== p2
->original_name
&&
412 p1
->aggregated_name
== p2
->aggregated_name
;
416 * tomoyo_update_aggregator_entry - Update "struct tomoyo_aggregator_entry" list.
418 * @original_name: The original program's name.
419 * @aggregated_name: The program name to use.
420 * @is_delete: True if it is a delete request.
422 * Returns 0 on success, negative value otherwise.
424 * Caller holds tomoyo_read_lock().
426 static int tomoyo_update_aggregator_entry(const char *original_name
,
427 const char *aggregated_name
,
428 const bool is_delete
)
430 struct tomoyo_aggregator_entry e
= { };
431 int error
= is_delete
? -ENOENT
: -ENOMEM
;
433 if (!tomoyo_correct_path(original_name
) ||
434 !tomoyo_correct_path(aggregated_name
))
436 e
.original_name
= tomoyo_get_name(original_name
);
437 e
.aggregated_name
= tomoyo_get_name(aggregated_name
);
438 if (!e
.original_name
|| !e
.aggregated_name
||
439 e
.aggregated_name
->is_patterned
) /* No patterns allowed. */
441 error
= tomoyo_update_policy(&e
.head
, sizeof(e
), is_delete
,
442 &tomoyo_policy_list
[TOMOYO_ID_AGGREGATOR
],
443 tomoyo_same_aggregator_entry
);
445 tomoyo_put_name(e
.original_name
);
446 tomoyo_put_name(e
.aggregated_name
);
451 * tomoyo_write_aggregator_policy - Write "struct tomoyo_aggregator_entry" list.
453 * @data: String to parse.
454 * @is_delete: True if it is a delete request.
456 * Returns 0 on success, negative value otherwise.
458 * Caller holds tomoyo_read_lock().
460 int tomoyo_write_aggregator_policy(char *data
, const bool is_delete
)
462 char *cp
= strchr(data
, ' ');
467 return tomoyo_update_aggregator_entry(data
, cp
, is_delete
);
470 static bool tomoyo_same_alias_entry(const struct tomoyo_acl_head
*a
,
471 const struct tomoyo_acl_head
*b
)
473 const struct tomoyo_alias_entry
*p1
= container_of(a
, typeof(*p1
),
475 const struct tomoyo_alias_entry
*p2
= container_of(b
, typeof(*p2
),
477 return p1
->original_name
== p2
->original_name
&&
478 p1
->aliased_name
== p2
->aliased_name
;
482 * tomoyo_update_alias_entry - Update "struct tomoyo_alias_entry" list.
484 * @original_name: The original program's real name.
485 * @aliased_name: The symbolic program's symbolic link's name.
486 * @is_delete: True if it is a delete request.
488 * Returns 0 on success, negative value otherwise.
490 * Caller holds tomoyo_read_lock().
492 static int tomoyo_update_alias_entry(const char *original_name
,
493 const char *aliased_name
,
494 const bool is_delete
)
496 struct tomoyo_alias_entry e
= { };
497 int error
= is_delete
? -ENOENT
: -ENOMEM
;
499 if (!tomoyo_correct_path(original_name
) ||
500 !tomoyo_correct_path(aliased_name
))
502 e
.original_name
= tomoyo_get_name(original_name
);
503 e
.aliased_name
= tomoyo_get_name(aliased_name
);
504 if (!e
.original_name
|| !e
.aliased_name
||
505 e
.original_name
->is_patterned
|| e
.aliased_name
->is_patterned
)
506 goto out
; /* No patterns allowed. */
507 error
= tomoyo_update_policy(&e
.head
, sizeof(e
), is_delete
,
508 &tomoyo_policy_list
[TOMOYO_ID_ALIAS
],
509 tomoyo_same_alias_entry
);
511 tomoyo_put_name(e
.original_name
);
512 tomoyo_put_name(e
.aliased_name
);
517 * tomoyo_write_alias_policy - Write "struct tomoyo_alias_entry" list.
519 * @data: String to parse.
520 * @is_delete: True if it is a delete request.
522 * Returns 0 on success, negative value otherwise.
524 * Caller holds tomoyo_read_lock().
526 int tomoyo_write_alias_policy(char *data
, const bool is_delete
)
528 char *cp
= strchr(data
, ' ');
533 return tomoyo_update_alias_entry(data
, cp
, is_delete
);
537 * tomoyo_find_or_assign_new_domain - Create a domain.
539 * @domainname: The name of domain.
540 * @profile: Profile number to assign if the domain was newly created.
542 * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise.
544 * Caller holds tomoyo_read_lock().
546 struct tomoyo_domain_info
*tomoyo_find_or_assign_new_domain(const char *
550 struct tomoyo_domain_info
*entry
;
551 struct tomoyo_domain_info
*domain
= NULL
;
552 const struct tomoyo_path_info
*saved_domainname
;
555 if (!tomoyo_correct_domain(domainname
))
557 saved_domainname
= tomoyo_get_name(domainname
);
558 if (!saved_domainname
)
560 entry
= kzalloc(sizeof(*entry
), GFP_NOFS
);
561 if (mutex_lock_interruptible(&tomoyo_policy_lock
))
563 list_for_each_entry_rcu(domain
, &tomoyo_domain_list
, list
) {
564 if (domain
->is_deleted
||
565 tomoyo_pathcmp(saved_domainname
, domain
->domainname
))
570 if (!found
&& tomoyo_memory_ok(entry
)) {
571 INIT_LIST_HEAD(&entry
->acl_info_list
);
572 entry
->domainname
= saved_domainname
;
573 saved_domainname
= NULL
;
574 entry
->profile
= profile
;
575 list_add_tail_rcu(&entry
->list
, &tomoyo_domain_list
);
580 mutex_unlock(&tomoyo_policy_lock
);
582 tomoyo_put_name(saved_domainname
);
584 return found
? domain
: NULL
;
588 * tomoyo_find_next_domain - Find a domain.
590 * @bprm: Pointer to "struct linux_binprm".
592 * Returns 0 on success, negative value otherwise.
594 * Caller holds tomoyo_read_lock().
596 int tomoyo_find_next_domain(struct linux_binprm
*bprm
)
598 struct tomoyo_request_info r
;
599 char *tmp
= kzalloc(TOMOYO_EXEC_TMPSIZE
, GFP_NOFS
);
600 struct tomoyo_domain_info
*old_domain
= tomoyo_domain();
601 struct tomoyo_domain_info
*domain
= NULL
;
602 const char *old_domain_name
= old_domain
->domainname
->name
;
603 const char *original_name
= bprm
->filename
;
606 int retval
= -ENOMEM
;
607 bool need_kfree
= false;
608 struct tomoyo_path_info rn
= { }; /* real name */
609 struct tomoyo_path_info sn
= { }; /* symlink name */
610 struct tomoyo_path_info ln
; /* last name */
612 ln
.name
= tomoyo_get_last_name(old_domain
);
613 tomoyo_fill_path_info(&ln
);
614 mode
= tomoyo_init_request_info(&r
, NULL
, TOMOYO_MAC_FILE_EXECUTE
);
615 is_enforce
= (mode
== TOMOYO_CONFIG_ENFORCING
);
624 /* Get tomoyo_realpath of program. */
626 rn
.name
= tomoyo_realpath(original_name
);
629 tomoyo_fill_path_info(&rn
);
632 /* Get tomoyo_realpath of symbolic link. */
633 sn
.name
= tomoyo_realpath_nofollow(original_name
);
636 tomoyo_fill_path_info(&sn
);
638 /* Check 'alias' directive. */
639 if (tomoyo_pathcmp(&rn
, &sn
)) {
640 struct tomoyo_alias_entry
*ptr
;
641 /* Is this program allowed to be called via symbolic links? */
642 list_for_each_entry_rcu(ptr
,
643 &tomoyo_policy_list
[TOMOYO_ID_ALIAS
],
645 if (ptr
->head
.is_deleted
||
646 tomoyo_pathcmp(&rn
, ptr
->original_name
) ||
647 tomoyo_pathcmp(&sn
, ptr
->aliased_name
))
651 /* This is OK because it is read only. */
652 rn
= *ptr
->aliased_name
;
657 /* Check 'aggregator' directive. */
659 struct tomoyo_aggregator_entry
*ptr
;
660 list_for_each_entry_rcu(ptr
, &tomoyo_policy_list
661 [TOMOYO_ID_AGGREGATOR
], head
.list
) {
662 if (ptr
->head
.is_deleted
||
663 !tomoyo_path_matches_pattern(&rn
,
669 /* This is OK because it is read only. */
670 rn
= *ptr
->aggregated_name
;
675 /* Check execute permission. */
676 retval
= tomoyo_path_permission(&r
, TOMOYO_TYPE_EXECUTE
, &rn
);
677 if (retval
== TOMOYO_RETRY_REQUEST
)
682 if (tomoyo_domain_initializer(old_domain
->domainname
, &rn
, &ln
)) {
683 /* Transit to the child of tomoyo_kernel_domain domain. */
684 snprintf(tmp
, TOMOYO_EXEC_TMPSIZE
- 1,
685 TOMOYO_ROOT_NAME
" " "%s", rn
.name
);
686 } else if (old_domain
== &tomoyo_kernel_domain
&&
687 !tomoyo_policy_loaded
) {
689 * Needn't to transit from kernel domain before starting
690 * /sbin/init. But transit from kernel domain if executing
691 * initializers because they might start before /sbin/init.
694 } else if (tomoyo_domain_keeper(old_domain
->domainname
, &rn
, &ln
)) {
695 /* Keep current domain. */
698 /* Normal domain transition. */
699 snprintf(tmp
, TOMOYO_EXEC_TMPSIZE
- 1,
700 "%s %s", old_domain_name
, rn
.name
);
702 if (domain
|| strlen(tmp
) >= TOMOYO_EXEC_TMPSIZE
- 10)
704 domain
= tomoyo_find_domain(tmp
);
708 int error
= tomoyo_supervisor(&r
, "# wants to create domain\n"
710 if (error
== TOMOYO_RETRY_REQUEST
)
715 domain
= tomoyo_find_or_assign_new_domain(tmp
, old_domain
->profile
);
719 printk(KERN_WARNING
"TOMOYO-ERROR: Domain '%s' not defined.\n", tmp
);
723 old_domain
->transition_failed
= true;
727 /* Update reference count on "struct tomoyo_domain_info". */
728 atomic_inc(&domain
->users
);
729 bprm
->cred
->security
= domain
;