2 * security/tomoyo/common.c
4 * Common functions for TOMOYO.
6 * Copyright (C) 2005-2010 NTT DATA CORPORATION
9 #include <linux/uaccess.h>
10 #include <linux/slab.h>
11 #include <linux/security.h>
14 static struct tomoyo_profile tomoyo_default_profile
= {
15 .learning
= &tomoyo_default_profile
.preference
,
16 .permissive
= &tomoyo_default_profile
.preference
,
17 .enforcing
= &tomoyo_default_profile
.preference
,
18 .preference
.enforcing_verbose
= true,
19 .preference
.learning_max_entry
= 2048,
20 .preference
.learning_verbose
= false,
21 .preference
.permissive_verbose
= true
24 /* Profile version. Currently only 20090903 is defined. */
25 static unsigned int tomoyo_profile_version
;
27 /* Profile table. Memory is allocated as needed. */
28 static struct tomoyo_profile
*tomoyo_profile_ptr
[TOMOYO_MAX_PROFILES
];
30 /* String table for functionality that takes 4 modes. */
31 static const char *tomoyo_mode
[4] = {
32 "disabled", "learning", "permissive", "enforcing"
35 /* String table for /sys/kernel/security/tomoyo/profile */
36 static const char *tomoyo_mac_keywords
[TOMOYO_MAX_MAC_INDEX
37 + TOMOYO_MAX_MAC_CATEGORY_INDEX
] = {
38 [TOMOYO_MAC_FILE_EXECUTE
] = "file::execute",
39 [TOMOYO_MAC_FILE_OPEN
] = "file::open",
40 [TOMOYO_MAC_FILE_CREATE
] = "file::create",
41 [TOMOYO_MAC_FILE_UNLINK
] = "file::unlink",
42 [TOMOYO_MAC_FILE_MKDIR
] = "file::mkdir",
43 [TOMOYO_MAC_FILE_RMDIR
] = "file::rmdir",
44 [TOMOYO_MAC_FILE_MKFIFO
] = "file::mkfifo",
45 [TOMOYO_MAC_FILE_MKSOCK
] = "file::mksock",
46 [TOMOYO_MAC_FILE_TRUNCATE
] = "file::truncate",
47 [TOMOYO_MAC_FILE_SYMLINK
] = "file::symlink",
48 [TOMOYO_MAC_FILE_REWRITE
] = "file::rewrite",
49 [TOMOYO_MAC_FILE_MKBLOCK
] = "file::mkblock",
50 [TOMOYO_MAC_FILE_MKCHAR
] = "file::mkchar",
51 [TOMOYO_MAC_FILE_LINK
] = "file::link",
52 [TOMOYO_MAC_FILE_RENAME
] = "file::rename",
53 [TOMOYO_MAC_FILE_CHMOD
] = "file::chmod",
54 [TOMOYO_MAC_FILE_CHOWN
] = "file::chown",
55 [TOMOYO_MAC_FILE_CHGRP
] = "file::chgrp",
56 [TOMOYO_MAC_FILE_IOCTL
] = "file::ioctl",
57 [TOMOYO_MAC_FILE_CHROOT
] = "file::chroot",
58 [TOMOYO_MAC_FILE_MOUNT
] = "file::mount",
59 [TOMOYO_MAC_FILE_UMOUNT
] = "file::umount",
60 [TOMOYO_MAC_FILE_PIVOT_ROOT
] = "file::pivot_root",
61 [TOMOYO_MAX_MAC_INDEX
+ TOMOYO_MAC_CATEGORY_FILE
] = "file",
64 /* Permit policy management by non-root user? */
65 static bool tomoyo_manage_by_non_root
;
67 /* Utility functions. */
70 * tomoyo_yesno - Return "yes" or "no".
74 static const char *tomoyo_yesno(const unsigned int value
)
76 return value
? "yes" : "no";
79 static void tomoyo_addprintf(char *buffer
, int len
, const char *fmt
, ...)
82 const int pos
= strlen(buffer
);
84 vsnprintf(buffer
+ pos
, len
- pos
- 1, fmt
, args
);
89 * tomoyo_flush - Flush queued string to userspace's buffer.
91 * @head: Pointer to "struct tomoyo_io_buffer".
93 * Returns true if all data was flushed, false otherwise.
95 static bool tomoyo_flush(struct tomoyo_io_buffer
*head
)
97 while (head
->r
.w_pos
) {
98 const char *w
= head
->r
.w
[0];
101 if (len
> head
->read_user_buf_avail
)
102 len
= head
->read_user_buf_avail
;
105 if (copy_to_user(head
->read_user_buf
, w
, len
))
107 head
->read_user_buf_avail
-= len
;
108 head
->read_user_buf
+= len
;
115 /* Add '\0' for query. */
117 if (!head
->read_user_buf_avail
||
118 copy_to_user(head
->read_user_buf
, "", 1))
120 head
->read_user_buf_avail
--;
121 head
->read_user_buf
++;
124 for (len
= 0; len
< head
->r
.w_pos
; len
++)
125 head
->r
.w
[len
] = head
->r
.w
[len
+ 1];
132 * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
134 * @head: Pointer to "struct tomoyo_io_buffer".
135 * @string: String to print.
137 * Note that @string has to be kept valid until @head is kfree()d.
138 * This means that char[] allocated on stack memory cannot be passed to
139 * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
141 static void tomoyo_set_string(struct tomoyo_io_buffer
*head
, const char *string
)
143 if (head
->r
.w_pos
< TOMOYO_MAX_IO_READ_QUEUE
) {
144 head
->r
.w
[head
->r
.w_pos
++] = string
;
151 * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
153 * @head: Pointer to "struct tomoyo_io_buffer".
154 * @fmt: The printf()'s format string, followed by parameters.
156 void tomoyo_io_printf(struct tomoyo_io_buffer
*head
, const char *fmt
, ...)
160 int pos
= head
->r
.avail
;
161 int size
= head
->readbuf_size
- pos
;
165 len
= vsnprintf(head
->read_buf
+ pos
, size
, fmt
, args
) + 1;
167 if (pos
+ len
>= head
->readbuf_size
) {
171 head
->r
.avail
+= len
;
172 tomoyo_set_string(head
, head
->read_buf
+ pos
);
175 static void tomoyo_set_space(struct tomoyo_io_buffer
*head
)
177 tomoyo_set_string(head
, " ");
180 static bool tomoyo_set_lf(struct tomoyo_io_buffer
*head
)
182 tomoyo_set_string(head
, "\n");
183 return !head
->r
.w_pos
;
187 * tomoyo_print_name_union - Print a tomoyo_name_union.
189 * @head: Pointer to "struct tomoyo_io_buffer".
190 * @ptr: Pointer to "struct tomoyo_name_union".
192 static void tomoyo_print_name_union(struct tomoyo_io_buffer
*head
,
193 const struct tomoyo_name_union
*ptr
)
195 tomoyo_set_space(head
);
197 tomoyo_set_string(head
, "@");
198 tomoyo_set_string(head
, ptr
->group
->group_name
->name
);
200 tomoyo_set_string(head
, ptr
->filename
->name
);
205 * tomoyo_print_number_union - Print a tomoyo_number_union.
207 * @head: Pointer to "struct tomoyo_io_buffer".
208 * @ptr: Pointer to "struct tomoyo_number_union".
210 static void tomoyo_print_number_union(struct tomoyo_io_buffer
*head
,
211 const struct tomoyo_number_union
*ptr
)
213 tomoyo_set_space(head
);
215 tomoyo_set_string(head
, "@");
216 tomoyo_set_string(head
, ptr
->group
->group_name
->name
);
219 unsigned long min
= ptr
->values
[0];
220 const unsigned long max
= ptr
->values
[1];
221 u8 min_type
= ptr
->min_type
;
222 const u8 max_type
= ptr
->max_type
;
225 for (i
= 0; i
< 2; i
++) {
227 case TOMOYO_VALUE_TYPE_HEXADECIMAL
:
228 tomoyo_addprintf(buffer
, sizeof(buffer
),
231 case TOMOYO_VALUE_TYPE_OCTAL
:
232 tomoyo_addprintf(buffer
, sizeof(buffer
),
236 tomoyo_addprintf(buffer
, sizeof(buffer
),
240 if (min
== max
&& min_type
== max_type
)
242 tomoyo_addprintf(buffer
, sizeof(buffer
), "-");
246 tomoyo_io_printf(head
, "%s", buffer
);
251 * tomoyo_assign_profile - Create a new profile.
253 * @profile: Profile number to create.
255 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
257 static struct tomoyo_profile
*tomoyo_assign_profile(const unsigned int profile
)
259 struct tomoyo_profile
*ptr
;
260 struct tomoyo_profile
*entry
;
261 if (profile
>= TOMOYO_MAX_PROFILES
)
263 ptr
= tomoyo_profile_ptr
[profile
];
266 entry
= kzalloc(sizeof(*entry
), GFP_NOFS
);
267 if (mutex_lock_interruptible(&tomoyo_policy_lock
))
269 ptr
= tomoyo_profile_ptr
[profile
];
270 if (!ptr
&& tomoyo_memory_ok(entry
)) {
272 ptr
->learning
= &tomoyo_default_profile
.preference
;
273 ptr
->permissive
= &tomoyo_default_profile
.preference
;
274 ptr
->enforcing
= &tomoyo_default_profile
.preference
;
275 ptr
->default_config
= TOMOYO_CONFIG_DISABLED
;
276 memset(ptr
->config
, TOMOYO_CONFIG_USE_DEFAULT
,
277 sizeof(ptr
->config
));
278 mb(); /* Avoid out-of-order execution. */
279 tomoyo_profile_ptr
[profile
] = ptr
;
282 mutex_unlock(&tomoyo_policy_lock
);
289 * tomoyo_profile - Find a profile.
291 * @profile: Profile number to find.
293 * Returns pointer to "struct tomoyo_profile".
295 struct tomoyo_profile
*tomoyo_profile(const u8 profile
)
297 struct tomoyo_profile
*ptr
= tomoyo_profile_ptr
[profile
];
298 if (!tomoyo_policy_loaded
)
299 return &tomoyo_default_profile
;
304 static s8
tomoyo_find_yesno(const char *string
, const char *find
)
306 const char *cp
= strstr(string
, find
);
309 if (!strncmp(cp
, "=yes", 4))
311 else if (!strncmp(cp
, "=no", 3))
317 static void tomoyo_set_bool(bool *b
, const char *string
, const char *find
)
319 switch (tomoyo_find_yesno(string
, find
)) {
329 static void tomoyo_set_uint(unsigned int *i
, const char *string
,
332 const char *cp
= strstr(string
, find
);
334 sscanf(cp
+ strlen(find
), "=%u", i
);
337 static void tomoyo_set_pref(const char *name
, const char *value
,
338 const bool use_default
,
339 struct tomoyo_profile
*profile
)
341 struct tomoyo_preference
**pref
;
343 if (!strcmp(name
, "enforcing")) {
345 pref
= &profile
->enforcing
;
348 profile
->enforcing
= &profile
->preference
;
349 verbose
= &profile
->preference
.enforcing_verbose
;
352 if (!strcmp(name
, "permissive")) {
354 pref
= &profile
->permissive
;
357 profile
->permissive
= &profile
->preference
;
358 verbose
= &profile
->preference
.permissive_verbose
;
361 if (!strcmp(name
, "learning")) {
363 pref
= &profile
->learning
;
366 profile
->learning
= &profile
->preference
;
367 tomoyo_set_uint(&profile
->preference
.learning_max_entry
, value
,
369 verbose
= &profile
->preference
.learning_verbose
;
374 *pref
= &tomoyo_default_profile
.preference
;
377 tomoyo_set_bool(verbose
, value
, "verbose");
380 static int tomoyo_set_mode(char *name
, const char *value
,
381 const bool use_default
,
382 struct tomoyo_profile
*profile
)
386 if (!strcmp(name
, "CONFIG")) {
387 i
= TOMOYO_MAX_MAC_INDEX
+ TOMOYO_MAX_MAC_CATEGORY_INDEX
;
388 config
= profile
->default_config
;
389 } else if (tomoyo_str_starts(&name
, "CONFIG::")) {
391 for (i
= 0; i
< TOMOYO_MAX_MAC_INDEX
392 + TOMOYO_MAX_MAC_CATEGORY_INDEX
; i
++) {
393 if (strcmp(name
, tomoyo_mac_keywords
[i
]))
395 config
= profile
->config
[i
];
398 if (i
== TOMOYO_MAX_MAC_INDEX
+ TOMOYO_MAX_MAC_CATEGORY_INDEX
)
404 config
= TOMOYO_CONFIG_USE_DEFAULT
;
407 for (mode
= 0; mode
< 4; mode
++)
408 if (strstr(value
, tomoyo_mode
[mode
]))
410 * Update lower 3 bits in order to distinguish
411 * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
413 config
= (config
& ~7) | mode
;
415 if (i
< TOMOYO_MAX_MAC_INDEX
+ TOMOYO_MAX_MAC_CATEGORY_INDEX
)
416 profile
->config
[i
] = config
;
417 else if (config
!= TOMOYO_CONFIG_USE_DEFAULT
)
418 profile
->default_config
= config
;
423 * tomoyo_write_profile - Write profile table.
425 * @head: Pointer to "struct tomoyo_io_buffer".
427 * Returns 0 on success, negative value otherwise.
429 static int tomoyo_write_profile(struct tomoyo_io_buffer
*head
)
431 char *data
= head
->write_buf
;
433 bool use_default
= false;
435 struct tomoyo_profile
*profile
;
436 if (sscanf(data
, "PROFILE_VERSION=%u", &tomoyo_profile_version
) == 1)
438 i
= simple_strtoul(data
, &cp
, 10);
440 profile
= &tomoyo_default_profile
;
445 profile
= tomoyo_assign_profile(i
);
449 cp
= strchr(data
, '=');
453 if (profile
!= &tomoyo_default_profile
)
454 use_default
= strstr(cp
, "use_default") != NULL
;
455 if (tomoyo_str_starts(&data
, "PREFERENCE::")) {
456 tomoyo_set_pref(data
, cp
, use_default
, profile
);
459 if (profile
== &tomoyo_default_profile
)
461 if (!strcmp(data
, "COMMENT")) {
462 static DEFINE_SPINLOCK(lock
);
463 const struct tomoyo_path_info
*new_comment
464 = tomoyo_get_name(cp
);
465 const struct tomoyo_path_info
*old_comment
;
469 old_comment
= profile
->comment
;
470 profile
->comment
= new_comment
;
472 tomoyo_put_name(old_comment
);
475 return tomoyo_set_mode(data
, cp
, use_default
, profile
);
478 static void tomoyo_print_preference(struct tomoyo_io_buffer
*head
,
481 struct tomoyo_preference
*pref
= &tomoyo_default_profile
.preference
;
482 const struct tomoyo_profile
*profile
= idx
>= 0 ?
483 tomoyo_profile_ptr
[idx
] : NULL
;
484 char buffer
[16] = "";
486 buffer
[sizeof(buffer
) - 1] = '\0';
487 snprintf(buffer
, sizeof(buffer
) - 1, "%u-", idx
);
490 pref
= profile
->learning
;
491 if (pref
== &tomoyo_default_profile
.preference
)
494 tomoyo_io_printf(head
, "%sPREFERENCE::%s={ "
495 "verbose=%s max_entry=%u }\n",
497 tomoyo_yesno(pref
->learning_verbose
),
498 pref
->learning_max_entry
);
501 pref
= profile
->permissive
;
502 if (pref
== &tomoyo_default_profile
.preference
)
505 tomoyo_io_printf(head
, "%sPREFERENCE::%s={ verbose=%s }\n",
506 buffer
, "permissive",
507 tomoyo_yesno(pref
->permissive_verbose
));
510 pref
= profile
->enforcing
;
511 if (pref
== &tomoyo_default_profile
.preference
)
514 tomoyo_io_printf(head
, "%sPREFERENCE::%s={ verbose=%s }\n",
516 tomoyo_yesno(pref
->enforcing_verbose
));
519 static void tomoyo_print_config(struct tomoyo_io_buffer
*head
, const u8 config
)
521 tomoyo_io_printf(head
, "={ mode=%s }\n", tomoyo_mode
[config
& 3]);
525 * tomoyo_read_profile - Read profile table.
527 * @head: Pointer to "struct tomoyo_io_buffer".
529 static void tomoyo_read_profile(struct tomoyo_io_buffer
*head
)
532 const struct tomoyo_profile
*profile
;
534 index
= head
->r
.index
;
535 profile
= tomoyo_profile_ptr
[index
];
536 switch (head
->r
.step
) {
538 tomoyo_io_printf(head
, "PROFILE_VERSION=%s\n", "20090903");
539 tomoyo_print_preference(head
, -1);
543 for ( ; head
->r
.index
< TOMOYO_MAX_PROFILES
;
545 if (tomoyo_profile_ptr
[head
->r
.index
])
547 if (head
->r
.index
== TOMOYO_MAX_PROFILES
)
553 const struct tomoyo_path_info
*comment
=
555 tomoyo_io_printf(head
, "%u-COMMENT=", index
);
556 tomoyo_set_string(head
, comment
? comment
->name
: "");
563 tomoyo_io_printf(head
, "%u-%s", index
, "CONFIG");
564 tomoyo_print_config(head
, profile
->default_config
);
570 for ( ; head
->r
.bit
< TOMOYO_MAX_MAC_INDEX
571 + TOMOYO_MAX_MAC_CATEGORY_INDEX
; head
->r
.bit
++) {
572 const u8 i
= head
->r
.bit
;
573 const u8 config
= profile
->config
[i
];
574 if (config
== TOMOYO_CONFIG_USE_DEFAULT
)
576 tomoyo_io_printf(head
, "%u-%s%s", index
, "CONFIG::",
577 tomoyo_mac_keywords
[i
]);
578 tomoyo_print_config(head
, config
);
582 if (head
->r
.bit
== TOMOYO_MAX_MAC_INDEX
583 + TOMOYO_MAX_MAC_CATEGORY_INDEX
) {
584 tomoyo_print_preference(head
, index
);
590 if (tomoyo_flush(head
))
594 static bool tomoyo_same_manager(const struct tomoyo_acl_head
*a
,
595 const struct tomoyo_acl_head
*b
)
597 return container_of(a
, struct tomoyo_manager
, head
)->manager
==
598 container_of(b
, struct tomoyo_manager
, head
)->manager
;
602 * tomoyo_update_manager_entry - Add a manager entry.
604 * @manager: The path to manager or the domainnamme.
605 * @is_delete: True if it is a delete request.
607 * Returns 0 on success, negative value otherwise.
609 * Caller holds tomoyo_read_lock().
611 static int tomoyo_update_manager_entry(const char *manager
,
612 const bool is_delete
)
614 struct tomoyo_manager e
= { };
617 if (tomoyo_domain_def(manager
)) {
618 if (!tomoyo_correct_domain(manager
))
622 if (!tomoyo_correct_path(manager
))
625 e
.manager
= tomoyo_get_name(manager
);
628 error
= tomoyo_update_policy(&e
.head
, sizeof(e
), is_delete
,
629 &tomoyo_policy_list
[TOMOYO_ID_MANAGER
],
630 tomoyo_same_manager
);
631 tomoyo_put_name(e
.manager
);
636 * tomoyo_write_manager - Write manager policy.
638 * @head: Pointer to "struct tomoyo_io_buffer".
640 * Returns 0 on success, negative value otherwise.
642 * Caller holds tomoyo_read_lock().
644 static int tomoyo_write_manager(struct tomoyo_io_buffer
*head
)
646 char *data
= head
->write_buf
;
647 bool is_delete
= tomoyo_str_starts(&data
, TOMOYO_KEYWORD_DELETE
);
649 if (!strcmp(data
, "manage_by_non_root")) {
650 tomoyo_manage_by_non_root
= !is_delete
;
653 return tomoyo_update_manager_entry(data
, is_delete
);
657 * tomoyo_read_manager - Read manager policy.
659 * @head: Pointer to "struct tomoyo_io_buffer".
661 * Caller holds tomoyo_read_lock().
663 static void tomoyo_read_manager(struct tomoyo_io_buffer
*head
)
667 list_for_each_cookie(head
->r
.acl
,
668 &tomoyo_policy_list
[TOMOYO_ID_MANAGER
]) {
669 struct tomoyo_manager
*ptr
=
670 list_entry(head
->r
.acl
, typeof(*ptr
), head
.list
);
671 if (ptr
->head
.is_deleted
)
673 if (!tomoyo_flush(head
))
675 tomoyo_set_string(head
, ptr
->manager
->name
);
682 * tomoyo_manager - Check whether the current process is a policy manager.
684 * Returns true if the current process is permitted to modify policy
685 * via /sys/kernel/security/tomoyo/ interface.
687 * Caller holds tomoyo_read_lock().
689 static bool tomoyo_manager(void)
691 struct tomoyo_manager
*ptr
;
693 const struct task_struct
*task
= current
;
694 const struct tomoyo_path_info
*domainname
= tomoyo_domain()->domainname
;
697 if (!tomoyo_policy_loaded
)
699 if (!tomoyo_manage_by_non_root
&& (task
->cred
->uid
|| task
->cred
->euid
))
701 list_for_each_entry_rcu(ptr
, &tomoyo_policy_list
[TOMOYO_ID_MANAGER
],
703 if (!ptr
->head
.is_deleted
&& ptr
->is_domain
704 && !tomoyo_pathcmp(domainname
, ptr
->manager
)) {
711 exe
= tomoyo_get_exe();
714 list_for_each_entry_rcu(ptr
, &tomoyo_policy_list
[TOMOYO_ID_MANAGER
],
716 if (!ptr
->head
.is_deleted
&& !ptr
->is_domain
717 && !strcmp(exe
, ptr
->manager
->name
)) {
722 if (!found
) { /* Reduce error messages. */
723 static pid_t last_pid
;
724 const pid_t pid
= current
->pid
;
725 if (last_pid
!= pid
) {
726 printk(KERN_WARNING
"%s ( %s ) is not permitted to "
727 "update policies.\n", domainname
->name
, exe
);
736 * tomoyo_select_one - Parse select command.
738 * @head: Pointer to "struct tomoyo_io_buffer".
739 * @data: String to parse.
741 * Returns true on success, false otherwise.
743 * Caller holds tomoyo_read_lock().
745 static bool tomoyo_select_one(struct tomoyo_io_buffer
*head
, const char *data
)
748 struct tomoyo_domain_info
*domain
= NULL
;
749 bool global_pid
= false;
751 if (!strcmp(data
, "allow_execute")) {
752 head
->r
.print_execute_only
= true;
755 if (sscanf(data
, "pid=%u", &pid
) == 1 ||
756 (global_pid
= true, sscanf(data
, "global-pid=%u", &pid
) == 1)) {
757 struct task_struct
*p
;
759 read_lock(&tasklist_lock
);
761 p
= find_task_by_pid_ns(pid
, &init_pid_ns
);
763 p
= find_task_by_vpid(pid
);
765 domain
= tomoyo_real_domain(p
);
766 read_unlock(&tasklist_lock
);
768 } else if (!strncmp(data
, "domain=", 7)) {
769 if (tomoyo_domain_def(data
+ 7))
770 domain
= tomoyo_find_domain(data
+ 7);
773 head
->write_var1
= domain
;
774 /* Accessing read_buf is safe because head->io_sem is held. */
776 return true; /* Do nothing if open(O_WRONLY). */
777 memset(&head
->r
, 0, sizeof(head
->r
));
778 head
->r
.print_this_domain_only
= true;
780 head
->r
.domain
= &domain
->list
;
783 tomoyo_io_printf(head
, "# select %s\n", data
);
784 if (domain
&& domain
->is_deleted
)
785 tomoyo_io_printf(head
, "# This is a deleted domain.\n");
790 * tomoyo_delete_domain - Delete a domain.
792 * @domainname: The name of domain.
796 * Caller holds tomoyo_read_lock().
798 static int tomoyo_delete_domain(char *domainname
)
800 struct tomoyo_domain_info
*domain
;
801 struct tomoyo_path_info name
;
803 name
.name
= domainname
;
804 tomoyo_fill_path_info(&name
);
805 if (mutex_lock_interruptible(&tomoyo_policy_lock
))
807 /* Is there an active domain? */
808 list_for_each_entry_rcu(domain
, &tomoyo_domain_list
, list
) {
809 /* Never delete tomoyo_kernel_domain */
810 if (domain
== &tomoyo_kernel_domain
)
812 if (domain
->is_deleted
||
813 tomoyo_pathcmp(domain
->domainname
, &name
))
815 domain
->is_deleted
= true;
818 mutex_unlock(&tomoyo_policy_lock
);
823 * tomoyo_write_domain2 - Write domain policy.
825 * @head: Pointer to "struct tomoyo_io_buffer".
827 * Returns 0 on success, negative value otherwise.
829 * Caller holds tomoyo_read_lock().
831 static int tomoyo_write_domain2(char *data
, struct tomoyo_domain_info
*domain
,
832 const bool is_delete
)
834 if (tomoyo_str_starts(&data
, TOMOYO_KEYWORD_ALLOW_MOUNT
))
835 return tomoyo_write_mount(data
, domain
, is_delete
);
836 return tomoyo_write_file(data
, domain
, is_delete
);
840 * tomoyo_write_domain - Write domain policy.
842 * @head: Pointer to "struct tomoyo_io_buffer".
844 * Returns 0 on success, negative value otherwise.
846 * Caller holds tomoyo_read_lock().
848 static int tomoyo_write_domain(struct tomoyo_io_buffer
*head
)
850 char *data
= head
->write_buf
;
851 struct tomoyo_domain_info
*domain
= head
->write_var1
;
852 bool is_delete
= false;
853 bool is_select
= false;
854 unsigned int profile
;
856 if (tomoyo_str_starts(&data
, TOMOYO_KEYWORD_DELETE
))
858 else if (tomoyo_str_starts(&data
, TOMOYO_KEYWORD_SELECT
))
860 if (is_select
&& tomoyo_select_one(head
, data
))
862 /* Don't allow updating policies by non manager programs. */
863 if (!tomoyo_manager())
865 if (tomoyo_domain_def(data
)) {
868 tomoyo_delete_domain(data
);
870 domain
= tomoyo_find_domain(data
);
872 domain
= tomoyo_assign_domain(data
, 0);
873 head
->write_var1
= domain
;
879 if (sscanf(data
, TOMOYO_KEYWORD_USE_PROFILE
"%u", &profile
) == 1
880 && profile
< TOMOYO_MAX_PROFILES
) {
881 if (tomoyo_profile_ptr
[profile
] || !tomoyo_policy_loaded
)
882 domain
->profile
= (u8
) profile
;
885 if (!strcmp(data
, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ
)) {
886 domain
->ignore_global_allow_read
= !is_delete
;
889 if (!strcmp(data
, TOMOYO_KEYWORD_QUOTA_EXCEEDED
)) {
890 domain
->quota_warned
= !is_delete
;
893 if (!strcmp(data
, TOMOYO_KEYWORD_TRANSITION_FAILED
)) {
894 domain
->transition_failed
= !is_delete
;
897 return tomoyo_write_domain2(data
, domain
, is_delete
);
901 * tomoyo_fns - Find next set bit.
903 * @perm: 8 bits value.
904 * @bit: First bit to find.
906 * Returns next on-bit on success, 8 otherwise.
908 static u8
tomoyo_fns(const u8 perm
, u8 bit
)
910 for ( ; bit
< 8; bit
++)
911 if (perm
& (1 << bit
))
917 * tomoyo_print_entry - Print an ACL entry.
919 * @head: Pointer to "struct tomoyo_io_buffer".
920 * @acl: Pointer to an ACL entry.
922 * Returns true on success, false otherwise.
924 static bool tomoyo_print_entry(struct tomoyo_io_buffer
*head
,
925 struct tomoyo_acl_info
*acl
)
927 const u8 acl_type
= acl
->type
;
934 if (!tomoyo_flush(head
))
936 else if (acl_type
== TOMOYO_TYPE_PATH_ACL
) {
937 struct tomoyo_path_acl
*ptr
=
938 container_of(acl
, typeof(*ptr
), head
);
939 const u16 perm
= ptr
->perm
;
940 for ( ; bit
< TOMOYO_MAX_PATH_OPERATION
; bit
++) {
941 if (!(perm
& (1 << bit
)))
943 if (head
->r
.print_execute_only
&&
944 bit
!= TOMOYO_TYPE_EXECUTE
)
946 /* Print "read/write" instead of "read" and "write". */
947 if ((bit
== TOMOYO_TYPE_READ
||
948 bit
== TOMOYO_TYPE_WRITE
)
949 && (perm
& (1 << TOMOYO_TYPE_READ_WRITE
)))
953 if (bit
>= TOMOYO_MAX_PATH_OPERATION
)
955 tomoyo_io_printf(head
, "allow_%s", tomoyo_path_keyword
[bit
]);
956 tomoyo_print_name_union(head
, &ptr
->name
);
957 } else if (head
->r
.print_execute_only
) {
959 } else if (acl_type
== TOMOYO_TYPE_PATH2_ACL
) {
960 struct tomoyo_path2_acl
*ptr
=
961 container_of(acl
, typeof(*ptr
), head
);
962 bit
= tomoyo_fns(ptr
->perm
, bit
);
963 if (bit
>= TOMOYO_MAX_PATH2_OPERATION
)
965 tomoyo_io_printf(head
, "allow_%s", tomoyo_path2_keyword
[bit
]);
966 tomoyo_print_name_union(head
, &ptr
->name1
);
967 tomoyo_print_name_union(head
, &ptr
->name2
);
968 } else if (acl_type
== TOMOYO_TYPE_PATH_NUMBER_ACL
) {
969 struct tomoyo_path_number_acl
*ptr
=
970 container_of(acl
, typeof(*ptr
), head
);
971 bit
= tomoyo_fns(ptr
->perm
, bit
);
972 if (bit
>= TOMOYO_MAX_PATH_NUMBER_OPERATION
)
974 tomoyo_io_printf(head
, "allow_%s",
975 tomoyo_path_number_keyword
[bit
]);
976 tomoyo_print_name_union(head
, &ptr
->name
);
977 tomoyo_print_number_union(head
, &ptr
->number
);
978 } else if (acl_type
== TOMOYO_TYPE_MKDEV_ACL
) {
979 struct tomoyo_mkdev_acl
*ptr
=
980 container_of(acl
, typeof(*ptr
), head
);
981 bit
= tomoyo_fns(ptr
->perm
, bit
);
982 if (bit
>= TOMOYO_MAX_MKDEV_OPERATION
)
984 tomoyo_io_printf(head
, "allow_%s", tomoyo_mkdev_keyword
[bit
]);
985 tomoyo_print_name_union(head
, &ptr
->name
);
986 tomoyo_print_number_union(head
, &ptr
->mode
);
987 tomoyo_print_number_union(head
, &ptr
->major
);
988 tomoyo_print_number_union(head
, &ptr
->minor
);
989 } else if (acl_type
== TOMOYO_TYPE_MOUNT_ACL
) {
990 struct tomoyo_mount_acl
*ptr
=
991 container_of(acl
, typeof(*ptr
), head
);
992 tomoyo_io_printf(head
, "allow_mount");
993 tomoyo_print_name_union(head
, &ptr
->dev_name
);
994 tomoyo_print_name_union(head
, &ptr
->dir_name
);
995 tomoyo_print_name_union(head
, &ptr
->fs_type
);
996 tomoyo_print_number_union(head
, &ptr
->flags
);
998 head
->r
.bit
= bit
+ 1;
999 tomoyo_io_printf(head
, "\n");
1000 if (acl_type
!= TOMOYO_TYPE_MOUNT_ACL
)
1008 * tomoyo_read_domain2 - Read domain policy.
1010 * @head: Pointer to "struct tomoyo_io_buffer".
1011 * @domain: Pointer to "struct tomoyo_domain_info".
1013 * Caller holds tomoyo_read_lock().
1015 * Returns true on success, false otherwise.
1017 static bool tomoyo_read_domain2(struct tomoyo_io_buffer
*head
,
1018 struct tomoyo_domain_info
*domain
)
1020 list_for_each_cookie(head
->r
.acl
, &domain
->acl_info_list
) {
1021 struct tomoyo_acl_info
*ptr
=
1022 list_entry(head
->r
.acl
, typeof(*ptr
), list
);
1023 if (!tomoyo_print_entry(head
, ptr
))
1031 * tomoyo_read_domain - Read domain policy.
1033 * @head: Pointer to "struct tomoyo_io_buffer".
1035 * Caller holds tomoyo_read_lock().
1037 static void tomoyo_read_domain(struct tomoyo_io_buffer
*head
)
1041 list_for_each_cookie(head
->r
.domain
, &tomoyo_domain_list
) {
1042 struct tomoyo_domain_info
*domain
=
1043 list_entry(head
->r
.domain
, typeof(*domain
), list
);
1044 switch (head
->r
.step
) {
1046 if (domain
->is_deleted
&&
1047 !head
->r
.print_this_domain_only
)
1049 /* Print domainname and flags. */
1050 tomoyo_set_string(head
, domain
->domainname
->name
);
1051 tomoyo_set_lf(head
);
1052 tomoyo_io_printf(head
,
1053 TOMOYO_KEYWORD_USE_PROFILE
"%u\n",
1055 if (domain
->quota_warned
)
1056 tomoyo_set_string(head
, "quota_exceeded\n");
1057 if (domain
->transition_failed
)
1058 tomoyo_set_string(head
, "transition_failed\n");
1059 if (domain
->ignore_global_allow_read
)
1060 tomoyo_set_string(head
,
1061 TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ
1064 tomoyo_set_lf(head
);
1067 if (!tomoyo_read_domain2(head
, domain
))
1070 if (!tomoyo_set_lf(head
))
1075 if (head
->r
.print_this_domain_only
)
1084 * tomoyo_write_domain_profile - Assign profile for specified domain.
1086 * @head: Pointer to "struct tomoyo_io_buffer".
1088 * Returns 0 on success, -EINVAL otherwise.
1090 * This is equivalent to doing
1092 * ( echo "select " $domainname; echo "use_profile " $profile ) |
1093 * /usr/sbin/tomoyo-loadpolicy -d
1095 * Caller holds tomoyo_read_lock().
1097 static int tomoyo_write_domain_profile(struct tomoyo_io_buffer
*head
)
1099 char *data
= head
->write_buf
;
1100 char *cp
= strchr(data
, ' ');
1101 struct tomoyo_domain_info
*domain
;
1102 unsigned long profile
;
1107 domain
= tomoyo_find_domain(cp
+ 1);
1108 if (strict_strtoul(data
, 10, &profile
))
1110 if (domain
&& profile
< TOMOYO_MAX_PROFILES
1111 && (tomoyo_profile_ptr
[profile
] || !tomoyo_policy_loaded
))
1112 domain
->profile
= (u8
) profile
;
1117 * tomoyo_read_domain_profile - Read only domainname and profile.
1119 * @head: Pointer to "struct tomoyo_io_buffer".
1121 * Returns list of profile number and domainname pairs.
1123 * This is equivalent to doing
1125 * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
1126 * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" )
1127 * domainname = $0; } else if ( $1 == "use_profile" ) {
1128 * print $2 " " domainname; domainname = ""; } } ; '
1130 * Caller holds tomoyo_read_lock().
1132 static void tomoyo_read_domain_profile(struct tomoyo_io_buffer
*head
)
1136 list_for_each_cookie(head
->r
.domain
, &tomoyo_domain_list
) {
1137 struct tomoyo_domain_info
*domain
=
1138 list_entry(head
->r
.domain
, typeof(*domain
), list
);
1139 if (domain
->is_deleted
)
1141 if (!tomoyo_flush(head
))
1143 tomoyo_io_printf(head
, "%u ", domain
->profile
);
1144 tomoyo_set_string(head
, domain
->domainname
->name
);
1145 tomoyo_set_lf(head
);
1151 * tomoyo_write_pid: Specify PID to obtain domainname.
1153 * @head: Pointer to "struct tomoyo_io_buffer".
1157 static int tomoyo_write_pid(struct tomoyo_io_buffer
*head
)
1159 head
->r
.eof
= false;
1164 * tomoyo_read_pid - Get domainname of the specified PID.
1166 * @head: Pointer to "struct tomoyo_io_buffer".
1168 * Returns the domainname which the specified PID is in on success,
1169 * empty string otherwise.
1170 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1171 * using read()/write() interface rather than sysctl() interface.
1173 static void tomoyo_read_pid(struct tomoyo_io_buffer
*head
)
1175 char *buf
= head
->write_buf
;
1176 bool global_pid
= false;
1178 struct task_struct
*p
;
1179 struct tomoyo_domain_info
*domain
= NULL
;
1181 /* Accessing write_buf is safe because head->io_sem is held. */
1184 return; /* Do nothing if open(O_RDONLY). */
1186 if (head
->r
.w_pos
|| head
->r
.eof
)
1189 if (tomoyo_str_starts(&buf
, "global-pid "))
1191 pid
= (unsigned int) simple_strtoul(buf
, NULL
, 10);
1193 read_lock(&tasklist_lock
);
1195 p
= find_task_by_pid_ns(pid
, &init_pid_ns
);
1197 p
= find_task_by_vpid(pid
);
1199 domain
= tomoyo_real_domain(p
);
1200 read_unlock(&tasklist_lock
);
1204 tomoyo_io_printf(head
, "%u %u ", pid
, domain
->profile
);
1205 tomoyo_set_string(head
, domain
->domainname
->name
);
1208 static const char *tomoyo_transition_type
[TOMOYO_MAX_TRANSITION_TYPE
] = {
1209 [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE
]
1210 = TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN
,
1211 [TOMOYO_TRANSITION_CONTROL_INITIALIZE
]
1212 = TOMOYO_KEYWORD_INITIALIZE_DOMAIN
,
1213 [TOMOYO_TRANSITION_CONTROL_NO_KEEP
] = TOMOYO_KEYWORD_NO_KEEP_DOMAIN
,
1214 [TOMOYO_TRANSITION_CONTROL_KEEP
] = TOMOYO_KEYWORD_KEEP_DOMAIN
1217 static const char *tomoyo_group_name
[TOMOYO_MAX_GROUP
] = {
1218 [TOMOYO_PATH_GROUP
] = TOMOYO_KEYWORD_PATH_GROUP
,
1219 [TOMOYO_NUMBER_GROUP
] = TOMOYO_KEYWORD_NUMBER_GROUP
1223 * tomoyo_write_exception - Write exception policy.
1225 * @head: Pointer to "struct tomoyo_io_buffer".
1227 * Returns 0 on success, negative value otherwise.
1229 * Caller holds tomoyo_read_lock().
1231 static int tomoyo_write_exception(struct tomoyo_io_buffer
*head
)
1233 char *data
= head
->write_buf
;
1234 bool is_delete
= tomoyo_str_starts(&data
, TOMOYO_KEYWORD_DELETE
);
1236 static const struct {
1237 const char *keyword
;
1238 int (*write
) (char *, const bool);
1239 } tomoyo_callback
[4] = {
1240 { TOMOYO_KEYWORD_AGGREGATOR
, tomoyo_write_aggregator
},
1241 { TOMOYO_KEYWORD_FILE_PATTERN
, tomoyo_write_pattern
},
1242 { TOMOYO_KEYWORD_DENY_REWRITE
, tomoyo_write_no_rewrite
},
1243 { TOMOYO_KEYWORD_ALLOW_READ
, tomoyo_write_globally_readable
},
1246 for (i
= 0; i
< TOMOYO_MAX_TRANSITION_TYPE
; i
++)
1247 if (tomoyo_str_starts(&data
, tomoyo_transition_type
[i
]))
1248 return tomoyo_write_transition_control(data
, is_delete
,
1250 for (i
= 0; i
< 4; i
++)
1251 if (tomoyo_str_starts(&data
, tomoyo_callback
[i
].keyword
))
1252 return tomoyo_callback
[i
].write(data
, is_delete
);
1253 for (i
= 0; i
< TOMOYO_MAX_GROUP
; i
++)
1254 if (tomoyo_str_starts(&data
, tomoyo_group_name
[i
]))
1255 return tomoyo_write_group(data
, is_delete
, i
);
1260 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group" list.
1262 * @head: Pointer to "struct tomoyo_io_buffer".
1263 * @idx: Index number.
1265 * Returns true on success, false otherwise.
1267 * Caller holds tomoyo_read_lock().
1269 static bool tomoyo_read_group(struct tomoyo_io_buffer
*head
, const int idx
)
1271 list_for_each_cookie(head
->r
.group
, &tomoyo_group_list
[idx
]) {
1272 struct tomoyo_group
*group
=
1273 list_entry(head
->r
.group
, typeof(*group
), list
);
1274 list_for_each_cookie(head
->r
.acl
, &group
->member_list
) {
1275 struct tomoyo_acl_head
*ptr
=
1276 list_entry(head
->r
.acl
, typeof(*ptr
), list
);
1277 if (ptr
->is_deleted
)
1279 if (!tomoyo_flush(head
))
1281 tomoyo_set_string(head
, tomoyo_group_name
[idx
]);
1282 tomoyo_set_string(head
, group
->group_name
->name
);
1283 if (idx
== TOMOYO_PATH_GROUP
) {
1284 tomoyo_set_space(head
);
1285 tomoyo_set_string(head
, container_of
1286 (ptr
, struct tomoyo_path_group
,
1287 head
)->member_name
->name
);
1288 } else if (idx
== TOMOYO_NUMBER_GROUP
) {
1289 tomoyo_print_number_union(head
, &container_of
1291 struct tomoyo_number_group
,
1294 tomoyo_set_lf(head
);
1298 head
->r
.group
= NULL
;
1303 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1305 * @head: Pointer to "struct tomoyo_io_buffer".
1306 * @idx: Index number.
1308 * Returns true on success, false otherwise.
1310 * Caller holds tomoyo_read_lock().
1312 static bool tomoyo_read_policy(struct tomoyo_io_buffer
*head
, const int idx
)
1314 list_for_each_cookie(head
->r
.acl
, &tomoyo_policy_list
[idx
]) {
1315 struct tomoyo_acl_head
*acl
=
1316 container_of(head
->r
.acl
, typeof(*acl
), list
);
1317 if (acl
->is_deleted
)
1319 if (!tomoyo_flush(head
))
1322 case TOMOYO_ID_TRANSITION_CONTROL
:
1324 struct tomoyo_transition_control
*ptr
=
1325 container_of(acl
, typeof(*ptr
), head
);
1326 tomoyo_set_string(head
,
1327 tomoyo_transition_type
1330 tomoyo_set_string(head
,
1331 ptr
->program
->name
);
1332 if (ptr
->program
&& ptr
->domainname
)
1333 tomoyo_set_string(head
, " from ");
1334 if (ptr
->domainname
)
1335 tomoyo_set_string(head
,
1340 case TOMOYO_ID_GLOBALLY_READABLE
:
1342 struct tomoyo_readable_file
*ptr
=
1343 container_of(acl
, typeof(*ptr
), head
);
1344 tomoyo_set_string(head
,
1345 TOMOYO_KEYWORD_ALLOW_READ
);
1346 tomoyo_set_string(head
, ptr
->filename
->name
);
1349 case TOMOYO_ID_AGGREGATOR
:
1351 struct tomoyo_aggregator
*ptr
=
1352 container_of(acl
, typeof(*ptr
), head
);
1353 tomoyo_set_string(head
,
1354 TOMOYO_KEYWORD_AGGREGATOR
);
1355 tomoyo_set_string(head
,
1356 ptr
->original_name
->name
);
1357 tomoyo_set_space(head
);
1358 tomoyo_set_string(head
,
1359 ptr
->aggregated_name
->name
);
1362 case TOMOYO_ID_PATTERN
:
1364 struct tomoyo_no_pattern
*ptr
=
1365 container_of(acl
, typeof(*ptr
), head
);
1366 tomoyo_set_string(head
,
1367 TOMOYO_KEYWORD_FILE_PATTERN
);
1368 tomoyo_set_string(head
, ptr
->pattern
->name
);
1371 case TOMOYO_ID_NO_REWRITE
:
1373 struct tomoyo_no_rewrite
*ptr
=
1374 container_of(acl
, typeof(*ptr
), head
);
1375 tomoyo_set_string(head
,
1376 TOMOYO_KEYWORD_DENY_REWRITE
);
1377 tomoyo_set_string(head
, ptr
->pattern
->name
);
1383 tomoyo_set_lf(head
);
1390 * tomoyo_read_exception - Read exception policy.
1392 * @head: Pointer to "struct tomoyo_io_buffer".
1394 * Caller holds tomoyo_read_lock().
1396 static void tomoyo_read_exception(struct tomoyo_io_buffer
*head
)
1400 while (head
->r
.step
< TOMOYO_MAX_POLICY
&&
1401 tomoyo_read_policy(head
, head
->r
.step
))
1403 if (head
->r
.step
< TOMOYO_MAX_POLICY
)
1405 while (head
->r
.step
< TOMOYO_MAX_POLICY
+ TOMOYO_MAX_GROUP
&&
1406 tomoyo_read_group(head
, head
->r
.step
- TOMOYO_MAX_POLICY
))
1408 if (head
->r
.step
< TOMOYO_MAX_POLICY
+ TOMOYO_MAX_GROUP
)
1414 * tomoyo_print_header - Get header line of audit log.
1416 * @r: Pointer to "struct tomoyo_request_info".
1418 * Returns string representation.
1420 * This function uses kmalloc(), so caller must kfree() if this function
1421 * didn't return NULL.
1423 static char *tomoyo_print_header(struct tomoyo_request_info
*r
)
1426 const pid_t gpid
= task_pid_nr(current
);
1427 static const int tomoyo_buffer_len
= 4096;
1428 char *buffer
= kmalloc(tomoyo_buffer_len
, GFP_NOFS
);
1432 do_gettimeofday(&tv
);
1434 ppid
= task_tgid_vnr(current
->real_parent
);
1436 snprintf(buffer
, tomoyo_buffer_len
- 1,
1437 "#timestamp=%lu profile=%u mode=%s (global-pid=%u)"
1438 " task={ pid=%u ppid=%u uid=%u gid=%u euid=%u"
1439 " egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }",
1440 tv
.tv_sec
, r
->profile
, tomoyo_mode
[r
->mode
], gpid
,
1441 task_tgid_vnr(current
), ppid
,
1442 current_uid(), current_gid(), current_euid(),
1443 current_egid(), current_suid(), current_sgid(),
1444 current_fsuid(), current_fsgid());
1449 * tomoyo_init_audit_log - Allocate buffer for audit logs.
1451 * @len: Required size.
1452 * @r: Pointer to "struct tomoyo_request_info".
1454 * Returns pointer to allocated memory.
1456 * The @len is updated to add the header lines' size on success.
1458 * This function uses kzalloc(), so caller must kfree() if this function
1459 * didn't return NULL.
1461 static char *tomoyo_init_audit_log(int *len
, struct tomoyo_request_info
*r
)
1465 const char *domainname
;
1467 r
->domain
= tomoyo_domain();
1468 domainname
= r
->domain
->domainname
->name
;
1469 header
= tomoyo_print_header(r
);
1472 *len
+= strlen(domainname
) + strlen(header
) + 10;
1473 buf
= kzalloc(*len
, GFP_NOFS
);
1475 snprintf(buf
, (*len
) - 1, "%s\n%s\n", header
, domainname
);
1480 /* Wait queue for tomoyo_query_list. */
1481 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait
);
1483 /* Lock for manipulating tomoyo_query_list. */
1484 static DEFINE_SPINLOCK(tomoyo_query_list_lock
);
1486 /* Structure for query. */
1487 struct tomoyo_query
{
1488 struct list_head list
;
1491 unsigned int serial
;
1496 /* The list for "struct tomoyo_query". */
1497 static LIST_HEAD(tomoyo_query_list
);
1500 * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1503 static atomic_t tomoyo_query_observers
= ATOMIC_INIT(0);
1506 * tomoyo_supervisor - Ask for the supervisor's decision.
1508 * @r: Pointer to "struct tomoyo_request_info".
1509 * @fmt: The printf()'s format string, followed by parameters.
1511 * Returns 0 if the supervisor decided to permit the access request which
1512 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1513 * supervisor decided to retry the access request which violated the policy in
1514 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1516 int tomoyo_supervisor(struct tomoyo_request_info
*r
, const char *fmt
, ...)
1522 static unsigned int tomoyo_serial
;
1523 struct tomoyo_query
*entry
= NULL
;
1524 bool quota_exceeded
= false;
1528 case TOMOYO_CONFIG_LEARNING
:
1529 if (!tomoyo_domain_quota_is_ok(r
))
1531 va_start(args
, fmt
);
1532 len
= vsnprintf((char *) &pos
, sizeof(pos
) - 1, fmt
, args
) + 4;
1534 buffer
= kmalloc(len
, GFP_NOFS
);
1537 va_start(args
, fmt
);
1538 vsnprintf(buffer
, len
- 1, fmt
, args
);
1540 tomoyo_normalize_line(buffer
);
1541 tomoyo_write_domain2(buffer
, r
->domain
, false);
1544 case TOMOYO_CONFIG_PERMISSIVE
:
1548 r
->domain
= tomoyo_domain();
1549 if (!atomic_read(&tomoyo_query_observers
))
1551 va_start(args
, fmt
);
1552 len
= vsnprintf((char *) &pos
, sizeof(pos
) - 1, fmt
, args
) + 32;
1554 header
= tomoyo_init_audit_log(&len
, r
);
1557 entry
= kzalloc(sizeof(*entry
), GFP_NOFS
);
1560 entry
->query
= kzalloc(len
, GFP_NOFS
);
1563 len
= ksize(entry
->query
);
1564 spin_lock(&tomoyo_query_list_lock
);
1565 if (tomoyo_quota_for_query
&& tomoyo_query_memory_size
+ len
+
1566 sizeof(*entry
) >= tomoyo_quota_for_query
) {
1567 quota_exceeded
= true;
1569 tomoyo_query_memory_size
+= len
+ sizeof(*entry
);
1570 entry
->serial
= tomoyo_serial
++;
1572 spin_unlock(&tomoyo_query_list_lock
);
1575 pos
= snprintf(entry
->query
, len
- 1, "Q%u-%hu\n%s",
1576 entry
->serial
, r
->retry
, header
);
1579 va_start(args
, fmt
);
1580 vsnprintf(entry
->query
+ pos
, len
- 1 - pos
, fmt
, args
);
1581 entry
->query_len
= strlen(entry
->query
) + 1;
1583 spin_lock(&tomoyo_query_list_lock
);
1584 list_add_tail(&entry
->list
, &tomoyo_query_list
);
1585 spin_unlock(&tomoyo_query_list_lock
);
1586 /* Give 10 seconds for supervisor's opinion. */
1587 for (entry
->timer
= 0;
1588 atomic_read(&tomoyo_query_observers
) && entry
->timer
< 100;
1590 wake_up(&tomoyo_query_wait
);
1591 set_current_state(TASK_INTERRUPTIBLE
);
1592 schedule_timeout(HZ
/ 10);
1596 spin_lock(&tomoyo_query_list_lock
);
1597 list_del(&entry
->list
);
1598 tomoyo_query_memory_size
-= len
+ sizeof(*entry
);
1599 spin_unlock(&tomoyo_query_list_lock
);
1600 switch (entry
->answer
) {
1601 case 3: /* Asked to retry by administrator. */
1602 error
= TOMOYO_RETRY_REQUEST
;
1606 /* Granted by administrator. */
1613 /* Rejected by administrator. */
1618 kfree(entry
->query
);
1625 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
1627 * @file: Pointer to "struct file".
1628 * @wait: Pointer to "poll_table".
1630 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
1632 * Waits for access requests which violated policy in enforcing mode.
1634 static int tomoyo_poll_query(struct file
*file
, poll_table
*wait
)
1636 struct list_head
*tmp
;
1639 for (i
= 0; i
< 2; i
++) {
1640 spin_lock(&tomoyo_query_list_lock
);
1641 list_for_each(tmp
, &tomoyo_query_list
) {
1642 struct tomoyo_query
*ptr
=
1643 list_entry(tmp
, typeof(*ptr
), list
);
1649 spin_unlock(&tomoyo_query_list_lock
);
1651 return POLLIN
| POLLRDNORM
;
1654 poll_wait(file
, &tomoyo_query_wait
, wait
);
1660 * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
1662 * @head: Pointer to "struct tomoyo_io_buffer".
1664 static void tomoyo_read_query(struct tomoyo_io_buffer
*head
)
1666 struct list_head
*tmp
;
1672 if (head
->read_buf
) {
1673 kfree(head
->read_buf
);
1674 head
->read_buf
= NULL
;
1676 spin_lock(&tomoyo_query_list_lock
);
1677 list_for_each(tmp
, &tomoyo_query_list
) {
1678 struct tomoyo_query
*ptr
= list_entry(tmp
, typeof(*ptr
), list
);
1681 if (pos
++ != head
->r
.query_index
)
1683 len
= ptr
->query_len
;
1686 spin_unlock(&tomoyo_query_list_lock
);
1688 head
->r
.query_index
= 0;
1691 buf
= kzalloc(len
, GFP_NOFS
);
1695 spin_lock(&tomoyo_query_list_lock
);
1696 list_for_each(tmp
, &tomoyo_query_list
) {
1697 struct tomoyo_query
*ptr
= list_entry(tmp
, typeof(*ptr
), list
);
1700 if (pos
++ != head
->r
.query_index
)
1703 * Some query can be skipped because tomoyo_query_list
1704 * can change, but I don't care.
1706 if (len
== ptr
->query_len
)
1707 memmove(buf
, ptr
->query
, len
);
1710 spin_unlock(&tomoyo_query_list_lock
);
1712 head
->read_buf
= buf
;
1713 head
->r
.w
[head
->r
.w_pos
++] = buf
;
1714 head
->r
.query_index
++;
1721 * tomoyo_write_answer - Write the supervisor's decision.
1723 * @head: Pointer to "struct tomoyo_io_buffer".
1725 * Returns 0 on success, -EINVAL otherwise.
1727 static int tomoyo_write_answer(struct tomoyo_io_buffer
*head
)
1729 char *data
= head
->write_buf
;
1730 struct list_head
*tmp
;
1731 unsigned int serial
;
1732 unsigned int answer
;
1733 spin_lock(&tomoyo_query_list_lock
);
1734 list_for_each(tmp
, &tomoyo_query_list
) {
1735 struct tomoyo_query
*ptr
= list_entry(tmp
, typeof(*ptr
), list
);
1738 spin_unlock(&tomoyo_query_list_lock
);
1739 if (sscanf(data
, "A%u=%u", &serial
, &answer
) != 2)
1741 spin_lock(&tomoyo_query_list_lock
);
1742 list_for_each(tmp
, &tomoyo_query_list
) {
1743 struct tomoyo_query
*ptr
= list_entry(tmp
, typeof(*ptr
), list
);
1744 if (ptr
->serial
!= serial
)
1747 ptr
->answer
= answer
;
1750 spin_unlock(&tomoyo_query_list_lock
);
1755 * tomoyo_read_version: Get version.
1757 * @head: Pointer to "struct tomoyo_io_buffer".
1759 * Returns version information.
1761 static void tomoyo_read_version(struct tomoyo_io_buffer
*head
)
1764 tomoyo_io_printf(head
, "2.3.0");
1770 * tomoyo_read_self_domain - Get the current process's domainname.
1772 * @head: Pointer to "struct tomoyo_io_buffer".
1774 * Returns the current process's domainname.
1776 static void tomoyo_read_self_domain(struct tomoyo_io_buffer
*head
)
1780 * tomoyo_domain()->domainname != NULL
1781 * because every process belongs to a domain and
1782 * the domain's name cannot be NULL.
1784 tomoyo_io_printf(head
, "%s", tomoyo_domain()->domainname
->name
);
1790 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
1792 * @type: Type of interface.
1793 * @file: Pointer to "struct file".
1795 * Associates policy handler and returns 0 on success, -ENOMEM otherwise.
1797 * Caller acquires tomoyo_read_lock().
1799 int tomoyo_open_control(const u8 type
, struct file
*file
)
1801 struct tomoyo_io_buffer
*head
= kzalloc(sizeof(*head
), GFP_NOFS
);
1805 mutex_init(&head
->io_sem
);
1808 case TOMOYO_DOMAINPOLICY
:
1809 /* /sys/kernel/security/tomoyo/domain_policy */
1810 head
->write
= tomoyo_write_domain
;
1811 head
->read
= tomoyo_read_domain
;
1813 case TOMOYO_EXCEPTIONPOLICY
:
1814 /* /sys/kernel/security/tomoyo/exception_policy */
1815 head
->write
= tomoyo_write_exception
;
1816 head
->read
= tomoyo_read_exception
;
1818 case TOMOYO_SELFDOMAIN
:
1819 /* /sys/kernel/security/tomoyo/self_domain */
1820 head
->read
= tomoyo_read_self_domain
;
1822 case TOMOYO_DOMAIN_STATUS
:
1823 /* /sys/kernel/security/tomoyo/.domain_status */
1824 head
->write
= tomoyo_write_domain_profile
;
1825 head
->read
= tomoyo_read_domain_profile
;
1827 case TOMOYO_PROCESS_STATUS
:
1828 /* /sys/kernel/security/tomoyo/.process_status */
1829 head
->write
= tomoyo_write_pid
;
1830 head
->read
= tomoyo_read_pid
;
1832 case TOMOYO_VERSION
:
1833 /* /sys/kernel/security/tomoyo/version */
1834 head
->read
= tomoyo_read_version
;
1835 head
->readbuf_size
= 128;
1837 case TOMOYO_MEMINFO
:
1838 /* /sys/kernel/security/tomoyo/meminfo */
1839 head
->write
= tomoyo_write_memory_quota
;
1840 head
->read
= tomoyo_read_memory_counter
;
1841 head
->readbuf_size
= 512;
1843 case TOMOYO_PROFILE
:
1844 /* /sys/kernel/security/tomoyo/profile */
1845 head
->write
= tomoyo_write_profile
;
1846 head
->read
= tomoyo_read_profile
;
1848 case TOMOYO_QUERY
: /* /sys/kernel/security/tomoyo/query */
1849 head
->poll
= tomoyo_poll_query
;
1850 head
->write
= tomoyo_write_answer
;
1851 head
->read
= tomoyo_read_query
;
1853 case TOMOYO_MANAGER
:
1854 /* /sys/kernel/security/tomoyo/manager */
1855 head
->write
= tomoyo_write_manager
;
1856 head
->read
= tomoyo_read_manager
;
1859 if (!(file
->f_mode
& FMODE_READ
)) {
1861 * No need to allocate read_buf since it is not opened
1866 } else if (!head
->poll
) {
1867 /* Don't allocate read_buf for poll() access. */
1868 if (!head
->readbuf_size
)
1869 head
->readbuf_size
= 4096 * 2;
1870 head
->read_buf
= kzalloc(head
->readbuf_size
, GFP_NOFS
);
1871 if (!head
->read_buf
) {
1876 if (!(file
->f_mode
& FMODE_WRITE
)) {
1878 * No need to allocate write_buf since it is not opened
1882 } else if (head
->write
) {
1883 head
->writebuf_size
= 4096 * 2;
1884 head
->write_buf
= kzalloc(head
->writebuf_size
, GFP_NOFS
);
1885 if (!head
->write_buf
) {
1886 kfree(head
->read_buf
);
1891 if (type
!= TOMOYO_QUERY
)
1892 head
->reader_idx
= tomoyo_read_lock();
1893 file
->private_data
= head
;
1895 * Call the handler now if the file is
1896 * /sys/kernel/security/tomoyo/self_domain
1897 * so that the user can use
1898 * cat < /sys/kernel/security/tomoyo/self_domain"
1899 * to know the current process's domainname.
1901 if (type
== TOMOYO_SELFDOMAIN
)
1902 tomoyo_read_control(file
, NULL
, 0);
1904 * If the file is /sys/kernel/security/tomoyo/query , increment the
1906 * The obserber counter is used by tomoyo_supervisor() to see if
1907 * there is some process monitoring /sys/kernel/security/tomoyo/query.
1909 else if (type
== TOMOYO_QUERY
)
1910 atomic_inc(&tomoyo_query_observers
);
1915 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
1917 * @file: Pointer to "struct file".
1918 * @wait: Pointer to "poll_table".
1920 * Waits for read readiness.
1921 * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd .
1923 int tomoyo_poll_control(struct file
*file
, poll_table
*wait
)
1925 struct tomoyo_io_buffer
*head
= file
->private_data
;
1928 return head
->poll(file
, wait
);
1932 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
1934 * @file: Pointer to "struct file".
1935 * @buffer: Poiner to buffer to write to.
1936 * @buffer_len: Size of @buffer.
1938 * Returns bytes read on success, negative value otherwise.
1940 * Caller holds tomoyo_read_lock().
1942 int tomoyo_read_control(struct file
*file
, char __user
*buffer
,
1943 const int buffer_len
)
1946 struct tomoyo_io_buffer
*head
= file
->private_data
;
1950 if (mutex_lock_interruptible(&head
->io_sem
))
1952 head
->read_user_buf
= buffer
;
1953 head
->read_user_buf_avail
= buffer_len
;
1954 if (tomoyo_flush(head
))
1955 /* Call the policy handler. */
1958 len
= head
->read_user_buf
- buffer
;
1959 mutex_unlock(&head
->io_sem
);
1964 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
1966 * @file: Pointer to "struct file".
1967 * @buffer: Pointer to buffer to read from.
1968 * @buffer_len: Size of @buffer.
1970 * Returns @buffer_len on success, negative value otherwise.
1972 * Caller holds tomoyo_read_lock().
1974 int tomoyo_write_control(struct file
*file
, const char __user
*buffer
,
1975 const int buffer_len
)
1977 struct tomoyo_io_buffer
*head
= file
->private_data
;
1978 int error
= buffer_len
;
1979 int avail_len
= buffer_len
;
1980 char *cp0
= head
->write_buf
;
1984 if (!access_ok(VERIFY_READ
, buffer
, buffer_len
))
1986 /* Don't allow updating policies by non manager programs. */
1987 if (head
->write
!= tomoyo_write_pid
&&
1988 head
->write
!= tomoyo_write_domain
&& !tomoyo_manager())
1990 if (mutex_lock_interruptible(&head
->io_sem
))
1992 /* Read a line and dispatch it to the policy handler. */
1993 while (avail_len
> 0) {
1995 if (head
->write_avail
>= head
->writebuf_size
- 1) {
1998 } else if (get_user(c
, buffer
)) {
2004 cp0
[head
->write_avail
++] = c
;
2007 cp0
[head
->write_avail
- 1] = '\0';
2008 head
->write_avail
= 0;
2009 tomoyo_normalize_line(cp0
);
2012 mutex_unlock(&head
->io_sem
);
2017 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2019 * @file: Pointer to "struct file".
2021 * Releases memory and returns 0.
2023 * Caller looses tomoyo_read_lock().
2025 int tomoyo_close_control(struct file
*file
)
2027 struct tomoyo_io_buffer
*head
= file
->private_data
;
2028 const bool is_write
= !!head
->write_buf
;
2031 * If the file is /sys/kernel/security/tomoyo/query , decrement the
2034 if (head
->type
== TOMOYO_QUERY
)
2035 atomic_dec(&tomoyo_query_observers
);
2037 tomoyo_read_unlock(head
->reader_idx
);
2038 /* Release memory used for policy I/O. */
2039 kfree(head
->read_buf
);
2040 head
->read_buf
= NULL
;
2041 kfree(head
->write_buf
);
2042 head
->write_buf
= NULL
;
2045 file
->private_data
= NULL
;
2052 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2054 void tomoyo_check_profile(void)
2056 struct tomoyo_domain_info
*domain
;
2057 const int idx
= tomoyo_read_lock();
2058 tomoyo_policy_loaded
= true;
2059 /* Check all profiles currently assigned to domains are defined. */
2060 list_for_each_entry_rcu(domain
, &tomoyo_domain_list
, list
) {
2061 const u8 profile
= domain
->profile
;
2062 if (tomoyo_profile_ptr
[profile
])
2064 printk(KERN_ERR
"You need to define profile %u before using it.\n",
2066 printk(KERN_ERR
"Please see http://tomoyo.sourceforge.jp/2.3/ "
2067 "for more information.\n");
2068 panic("Profile %u (used by '%s') not defined.\n",
2069 profile
, domain
->domainname
->name
);
2071 tomoyo_read_unlock(idx
);
2072 if (tomoyo_profile_version
!= 20090903) {
2073 printk(KERN_ERR
"You need to install userland programs for "
2074 "TOMOYO 2.3 and initialize policy configuration.\n");
2075 printk(KERN_ERR
"Please see http://tomoyo.sourceforge.jp/2.3/ "
2076 "for more information.\n");
2077 panic("Profile version %u is not supported.\n",
2078 tomoyo_profile_version
);
2080 printk(KERN_INFO
"TOMOYO: 2.3.0\n");
2081 printk(KERN_INFO
"Mandatory Access Control activated.\n");