2 * security/tomoyo/common.c
4 * Common functions for TOMOYO.
6 * Copyright (C) 2005-2009 NTT DATA CORPORATION
8 * Version: 2.2.0 2009/04/01
12 #include <linux/uaccess.h>
13 #include <linux/security.h>
14 #include <linux/hardirq.h>
19 /* Has loading policy done? */
20 bool tomoyo_policy_loaded;
22 /* String table for functionality that takes 4 modes. */
23 static const char *tomoyo_mode_4[4] = {
24 "disabled", "learning", "permissive", "enforcing"
26 /* String table for functionality that takes 2 modes. */
27 static const char *tomoyo_mode_2[4] = {
28 "disabled", "enabled", "enabled", "enabled"
32 * tomoyo_control_array is a static data which contains
34 * (1) functionality name used by /sys/kernel/security/tomoyo/profile .
35 * (2) initial values for "struct tomoyo_profile".
36 * (3) max values for "struct tomoyo_profile".
40 unsigned int current_value;
41 const unsigned int max_value;
42 } tomoyo_control_array[TOMOYO_MAX_CONTROL_INDEX] = {
43 [TOMOYO_MAC_FOR_FILE] = { "MAC_FOR_FILE", 0, 3 },
44 [TOMOYO_MAX_ACCEPT_ENTRY] = { "MAX_ACCEPT_ENTRY", 2048, INT_MAX },
45 [TOMOYO_VERBOSE] = { "TOMOYO_VERBOSE", 1, 1 },
49 * tomoyo_profile is a structure which is used for holding the mode of access
50 * controls. TOMOYO has 4 modes: disabled, learning, permissive, enforcing.
51 * An administrator can define up to 256 profiles.
52 * The ->profile of "struct tomoyo_domain_info" is used for remembering
53 * the profile's number (0 - 255) assigned to that domain.
55 static struct tomoyo_profile {
56 unsigned int value[TOMOYO_MAX_CONTROL_INDEX];
57 const struct tomoyo_path_info *comment;
58 } *tomoyo_profile_ptr[TOMOYO_MAX_PROFILES];
60 /* Permit policy management by non-root user? */
61 static bool tomoyo_manage_by_non_root;
63 /* Utility functions. */
65 /* Open operation for /sys/kernel/security/tomoyo/ interface. */
66 static int tomoyo_open_control(const u8 type, struct file *file);
67 /* Close /sys/kernel/security/tomoyo/ interface. */
68 static int tomoyo_close_control(struct file *file);
69 /* Read operation for /sys/kernel/security/tomoyo/ interface. */
70 static int tomoyo_read_control(struct file *file, char __user *buffer,
71 const int buffer_len);
72 /* Write operation for /sys/kernel/security/tomoyo/ interface. */
73 static int tomoyo_write_control(struct file *file, const char __user *buffer,
74 const int buffer_len);
77 * tomoyo_is_byte_range - Check whether the string isa \ooo style octal value.
79 * @str: Pointer to the string.
81 * Returns true if @str is a \ooo style octal value, false otherwise.
83 * TOMOYO uses \ooo style representation for 0x01 - 0x20 and 0x7F - 0xFF.
84 * This function verifies that \ooo is in valid range.
86 static inline bool tomoyo_is_byte_range(const char *str)
88 return *str >= '0' && *str++ <= '3' &&
89 *str >= '0' && *str++ <= '7' &&
90 *str >= '0' && *str <= '7';
94 * tomoyo_is_alphabet_char - Check whether the character is an alphabet.
96 * @c: The character to check.
98 * Returns true if @c is an alphabet character, false otherwise.
100 static inline bool tomoyo_is_alphabet_char(const char c)
102 return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
106 * tomoyo_make_byte - Make byte value from three octal characters.
108 * @c1: The first character.
109 * @c2: The second character.
110 * @c3: The third character.
112 * Returns byte value.
114 static inline u8 tomoyo_make_byte(const u8 c1, const u8 c2, const u8 c3)
116 return ((c1 - '0') << 6) + ((c2 - '0') << 3) + (c3 - '0');
120 * tomoyo_str_starts - Check whether the given string starts with the given keyword.
122 * @src: Pointer to pointer to the string.
123 * @find: Pointer to the keyword.
125 * Returns true if @src starts with @find, false otherwise.
127 * The @src is updated to point the first character after the @find
128 * if @src starts with @find.
130 static bool tomoyo_str_starts(char **src, const char *find)
132 const int len = strlen(find);
135 if (strncmp(tmp, find, len))
143 * tomoyo_normalize_line - Format string.
145 * @buffer: The line to normalize.
147 * Leading and trailing whitespaces are removed.
148 * Multiple whitespaces are packed into single space.
152 static void tomoyo_normalize_line(unsigned char *buffer)
154 unsigned char *sp = buffer;
155 unsigned char *dp = buffer;
158 while (tomoyo_is_invalid(*sp))
164 while (tomoyo_is_valid(*sp))
166 while (tomoyo_is_invalid(*sp))
173 * tomoyo_is_correct_path - Validate a pathname.
174 * @filename: The pathname to check.
175 * @start_type: Should the pathname start with '/'?
176 * 1 = must / -1 = must not / 0 = don't care
177 * @pattern_type: Can the pathname contain a wildcard?
178 * 1 = must / -1 = must not / 0 = don't care
179 * @end_type: Should the pathname end with '/'?
180 * 1 = must / -1 = must not / 0 = don't care
181 * @function: The name of function calling me.
183 * Check whether the given filename follows the naming rules.
184 * Returns true if @filename follows the naming rules, false otherwise.
186 bool tomoyo_is_correct_path(const char *filename, const s8 start_type,
187 const s8 pattern_type, const s8 end_type,
188 const char *function)
190 bool contains_pattern = false;
194 const char *original_filename = filename;
199 if (start_type == 1) { /* Must start with '/' */
202 } else if (start_type == -1) { /* Must not start with '/' */
207 c = *(filename + strlen(filename) - 1);
208 if (end_type == 1) { /* Must end with '/' */
211 } else if (end_type == -1) { /* Must not end with '/' */
215 while ((c = *filename++) != '\0') {
217 switch ((c = *filename++)) {
218 case '\\': /* "\\" */
230 if (pattern_type == -1)
231 break; /* Must not contain pattern */
232 contains_pattern = true;
234 case '0': /* "\ooo" */
239 if (d < '0' || d > '7')
242 if (e < '0' || e > '7')
244 c = tomoyo_make_byte(c, d, e);
245 if (tomoyo_is_invalid(c))
246 continue; /* pattern is not \000 */
249 } else if (tomoyo_is_invalid(c)) {
253 if (pattern_type == 1) { /* Must contain pattern */
254 if (!contains_pattern)
259 printk(KERN_DEBUG "%s: Invalid pathname '%s'\n", function,
265 * tomoyo_is_correct_domain - Check whether the given domainname follows the naming rules.
266 * @domainname: The domainname to check.
267 * @function: The name of function calling me.
269 * Returns true if @domainname follows the naming rules, false otherwise.
271 bool tomoyo_is_correct_domain(const unsigned char *domainname,
272 const char *function)
277 const char *org_domainname = domainname;
279 if (!domainname || strncmp(domainname, TOMOYO_ROOT_NAME,
280 TOMOYO_ROOT_NAME_LEN))
282 domainname += TOMOYO_ROOT_NAME_LEN;
286 if (*domainname++ != ' ')
288 if (*domainname++ != '/')
290 while ((c = *domainname) != '\0' && c != ' ') {
295 case '\\': /* "\\" */
297 case '0': /* "\ooo" */
302 if (d < '0' || d > '7')
305 if (e < '0' || e > '7')
307 c = tomoyo_make_byte(c, d, e);
308 if (tomoyo_is_invalid(c))
309 /* pattern is not \000 */
313 } else if (tomoyo_is_invalid(c)) {
317 } while (*domainname);
320 printk(KERN_DEBUG "%s: Invalid domainname '%s'\n", function,
326 * tomoyo_is_domain_def - Check whether the given token can be a domainname.
328 * @buffer: The token to check.
330 * Returns true if @buffer possibly be a domainname, false otherwise.
332 bool tomoyo_is_domain_def(const unsigned char *buffer)
334 return !strncmp(buffer, TOMOYO_ROOT_NAME, TOMOYO_ROOT_NAME_LEN);
338 * tomoyo_find_domain - Find a domain by the given name.
340 * @domainname: The domainname to find.
342 * Caller must call down_read(&tomoyo_domain_list_lock); or
343 * down_write(&tomoyo_domain_list_lock); .
345 * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
347 struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname)
349 struct tomoyo_domain_info *domain;
350 struct tomoyo_path_info name;
352 name.name = domainname;
353 tomoyo_fill_path_info(&name);
354 list_for_each_entry(domain, &tomoyo_domain_list, list) {
355 if (!domain->is_deleted &&
356 !tomoyo_pathcmp(&name, domain->domainname))
363 * tomoyo_path_depth - Evaluate the number of '/' in a string.
365 * @pathname: The string to evaluate.
367 * Returns path depth of the string.
369 * I score 2 for each of the '/' in the @pathname
370 * and score 1 if the @pathname ends with '/'.
372 static int tomoyo_path_depth(const char *pathname)
377 const char *ep = pathname + strlen(pathname);
378 if (pathname < ep--) {
381 while (pathname <= ep)
390 * tomoyo_const_part_length - Evaluate the initial length without a pattern in a token.
392 * @filename: The string to evaluate.
394 * Returns the initial length without a pattern in @filename.
396 static int tomoyo_const_part_length(const char *filename)
403 while ((c = *filename++) != '\0') {
410 case '\\': /* "\\" */
413 case '0': /* "\ooo" */
418 if (c < '0' || c > '7')
421 if (c < '0' || c > '7')
432 * tomoyo_fill_path_info - Fill in "struct tomoyo_path_info" members.
434 * @ptr: Pointer to "struct tomoyo_path_info" to fill in.
436 * The caller sets "struct tomoyo_path_info"->name.
438 void tomoyo_fill_path_info(struct tomoyo_path_info *ptr)
440 const char *name = ptr->name;
441 const int len = strlen(name);
443 ptr->const_len = tomoyo_const_part_length(name);
444 ptr->is_dir = len && (name[len - 1] == '/');
445 ptr->is_patterned = (ptr->const_len < len);
446 ptr->hash = full_name_hash(name, len);
447 ptr->depth = tomoyo_path_depth(name);
451 * tomoyo_file_matches_to_pattern2 - Pattern matching without '/' character
454 * @filename: The start of string to check.
455 * @filename_end: The end of string to check.
456 * @pattern: The start of pattern to compare.
457 * @pattern_end: The end of pattern to compare.
459 * Returns true if @filename matches @pattern, false otherwise.
461 static bool tomoyo_file_matches_to_pattern2(const char *filename,
462 const char *filename_end,
464 const char *pattern_end)
466 while (filename < filename_end && pattern < pattern_end) {
468 if (*pattern != '\\') {
469 if (*filename++ != *pattern++)
481 } else if (c == '\\') {
482 if (filename[1] == '\\')
484 else if (tomoyo_is_byte_range(filename + 1))
493 if (*++filename != '\\')
505 if (!tomoyo_is_alphabet_char(c))
512 if (c == '\\' && tomoyo_is_byte_range(filename + 1)
513 && strncmp(filename + 1, pattern, 3) == 0) {
518 return false; /* Not matched. */
521 for (i = 0; i <= filename_end - filename; i++) {
522 if (tomoyo_file_matches_to_pattern2(
523 filename + i, filename_end,
524 pattern + 1, pattern_end))
527 if (c == '.' && *pattern == '@')
531 if (filename[i + 1] == '\\')
533 else if (tomoyo_is_byte_range(filename + i + 1))
536 break; /* Bad pattern. */
538 return false; /* Not matched. */
543 while (isdigit(filename[j]))
545 } else if (c == 'X') {
546 while (isxdigit(filename[j]))
548 } else if (c == 'A') {
549 while (tomoyo_is_alphabet_char(filename[j]))
552 for (i = 1; i <= j; i++) {
553 if (tomoyo_file_matches_to_pattern2(
554 filename + i, filename_end,
555 pattern + 1, pattern_end))
558 return false; /* Not matched or bad pattern. */
563 while (*pattern == '\\' &&
564 (*(pattern + 1) == '*' || *(pattern + 1) == '@'))
566 return filename == filename_end && pattern == pattern_end;
570 * tomoyo_file_matches_to_pattern - Pattern matching without without '/' character.
572 * @filename: The start of string to check.
573 * @filename_end: The end of string to check.
574 * @pattern: The start of pattern to compare.
575 * @pattern_end: The end of pattern to compare.
577 * Returns true if @filename matches @pattern, false otherwise.
579 static bool tomoyo_file_matches_to_pattern(const char *filename,
580 const char *filename_end,
582 const char *pattern_end)
584 const char *pattern_start = pattern;
588 while (pattern < pattern_end - 1) {
589 /* Split at "\-" pattern. */
590 if (*pattern++ != '\\' || *pattern++ != '-')
592 result = tomoyo_file_matches_to_pattern2(filename,
601 pattern_start = pattern;
603 result = tomoyo_file_matches_to_pattern2(filename, filename_end,
604 pattern_start, pattern_end);
605 return first ? result : !result;
609 * tomoyo_path_matches_pattern - Check whether the given filename matches the given pattern.
610 * @filename: The filename to check.
611 * @pattern: The pattern to compare.
613 * Returns true if matches, false otherwise.
615 * The following patterns are available.
617 * \ooo Octal representation of a byte.
618 * \* More than or equals to 0 character other than '/'.
619 * \@ More than or equals to 0 character other than '/' or '.'.
620 * \? 1 byte character other than '/'.
621 * \$ More than or equals to 1 decimal digit.
622 * \+ 1 decimal digit.
623 * \X More than or equals to 1 hexadecimal digit.
624 * \x 1 hexadecimal digit.
625 * \A More than or equals to 1 alphabet character.
626 * \a 1 alphabet character.
627 * \- Subtraction operator.
629 bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
630 const struct tomoyo_path_info *pattern)
633 if (!filename || !pattern)
636 const char *f = filename->name;
637 const char *p = pattern->name;
638 const int len = pattern->const_len;
640 /* If @pattern doesn't contain pattern, I can use strcmp(). */
641 if (!pattern->is_patterned)
642 return !tomoyo_pathcmp(filename, pattern);
643 /* Dont compare if the number of '/' differs. */
644 if (filename->depth != pattern->depth)
646 /* Compare the initial length without patterns. */
647 if (strncmp(f, p, len))
651 /* Main loop. Compare each directory component. */
653 const char *f_delimiter = strchr(f, '/');
654 const char *p_delimiter = strchr(p, '/');
656 f_delimiter = f + strlen(f);
658 p_delimiter = p + strlen(p);
659 if (!tomoyo_file_matches_to_pattern(f, f_delimiter,
669 /* Ignore trailing "\*" and "\@" in @pattern. */
671 (*(p + 1) == '*' || *(p + 1) == '@'))
677 * tomoyo_io_printf - Transactional printf() to "struct tomoyo_io_buffer" structure.
679 * @head: Pointer to "struct tomoyo_io_buffer".
680 * @fmt: The printf()'s format string, followed by parameters.
682 * Returns true if output was written, false otherwise.
684 * The snprintf() will truncate, but tomoyo_io_printf() won't.
686 bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
690 int pos = head->read_avail;
691 int size = head->readbuf_size - pos;
696 len = vsnprintf(head->read_buf + pos, size, fmt, args);
698 if (pos + len >= head->readbuf_size)
700 head->read_avail += len;
705 * tomoyo_get_exe - Get tomoyo_realpath() of current process.
707 * Returns the tomoyo_realpath() of current process on success, NULL otherwise.
709 * This function uses tomoyo_alloc(), so the caller must call tomoyo_free()
710 * if this function didn't return NULL.
712 static const char *tomoyo_get_exe(void)
714 struct mm_struct *mm = current->mm;
715 struct vm_area_struct *vma;
716 const char *cp = NULL;
720 down_read(&mm->mmap_sem);
721 for (vma = mm->mmap; vma; vma = vma->vm_next) {
722 if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file) {
723 cp = tomoyo_realpath_from_path(&vma->vm_file->f_path);
727 up_read(&mm->mmap_sem);
732 * tomoyo_get_msg - Get warning message.
734 * @is_enforce: Is it enforcing mode?
736 * Returns "ERROR" or "WARNING".
738 const char *tomoyo_get_msg(const bool is_enforce)
747 * tomoyo_check_flags - Check mode for specified functionality.
749 * @domain: Pointer to "struct tomoyo_domain_info".
750 * @index: The functionality to check mode.
752 * TOMOYO checks only process context.
753 * This code disables TOMOYO's enforcement in case the function is called from
756 unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain,
759 const u8 profile = domain->profile;
761 if (WARN_ON(in_interrupt()))
763 return tomoyo_policy_loaded && index < TOMOYO_MAX_CONTROL_INDEX
764 #if TOMOYO_MAX_PROFILES != 256
765 && profile < TOMOYO_MAX_PROFILES
767 && tomoyo_profile_ptr[profile] ?
768 tomoyo_profile_ptr[profile]->value[index] : 0;
772 * tomoyo_verbose_mode - Check whether TOMOYO is verbose mode.
774 * @domain: Pointer to "struct tomoyo_domain_info".
776 * Returns true if domain policy violation warning should be printed to
779 bool tomoyo_verbose_mode(const struct tomoyo_domain_info *domain)
781 return tomoyo_check_flags(domain, TOMOYO_VERBOSE) != 0;
785 * tomoyo_domain_quota_is_ok - Check for domain's quota.
787 * @domain: Pointer to "struct tomoyo_domain_info".
789 * Returns true if the domain is not exceeded quota, false otherwise.
791 bool tomoyo_domain_quota_is_ok(struct tomoyo_domain_info * const domain)
793 unsigned int count = 0;
794 struct tomoyo_acl_info *ptr;
798 down_read(&tomoyo_domain_acl_info_list_lock);
799 list_for_each_entry(ptr, &domain->acl_info_list, list) {
800 if (ptr->type & TOMOYO_ACL_DELETED)
802 switch (tomoyo_acl_type2(ptr)) {
803 struct tomoyo_single_path_acl_record *acl1;
804 struct tomoyo_double_path_acl_record *acl2;
806 case TOMOYO_TYPE_SINGLE_PATH_ACL:
807 acl1 = container_of(ptr,
808 struct tomoyo_single_path_acl_record,
811 if (perm & (1 << TOMOYO_TYPE_EXECUTE_ACL))
814 ((1 << TOMOYO_TYPE_READ_ACL) |
815 (1 << TOMOYO_TYPE_WRITE_ACL)))
817 if (perm & (1 << TOMOYO_TYPE_CREATE_ACL))
819 if (perm & (1 << TOMOYO_TYPE_UNLINK_ACL))
821 if (perm & (1 << TOMOYO_TYPE_MKDIR_ACL))
823 if (perm & (1 << TOMOYO_TYPE_RMDIR_ACL))
825 if (perm & (1 << TOMOYO_TYPE_MKFIFO_ACL))
827 if (perm & (1 << TOMOYO_TYPE_MKSOCK_ACL))
829 if (perm & (1 << TOMOYO_TYPE_MKBLOCK_ACL))
831 if (perm & (1 << TOMOYO_TYPE_MKCHAR_ACL))
833 if (perm & (1 << TOMOYO_TYPE_TRUNCATE_ACL))
835 if (perm & (1 << TOMOYO_TYPE_SYMLINK_ACL))
837 if (perm & (1 << TOMOYO_TYPE_REWRITE_ACL))
840 case TOMOYO_TYPE_DOUBLE_PATH_ACL:
841 acl2 = container_of(ptr,
842 struct tomoyo_double_path_acl_record,
845 if (perm & (1 << TOMOYO_TYPE_LINK_ACL))
847 if (perm & (1 << TOMOYO_TYPE_RENAME_ACL))
852 up_read(&tomoyo_domain_acl_info_list_lock);
853 if (count < tomoyo_check_flags(domain, TOMOYO_MAX_ACCEPT_ENTRY))
855 if (!domain->quota_warned) {
856 domain->quota_warned = true;
857 printk(KERN_WARNING "TOMOYO-WARNING: "
858 "Domain '%s' has so many ACLs to hold. "
859 "Stopped learning mode.\n", domain->domainname->name);
865 * tomoyo_find_or_assign_new_profile - Create a new profile.
867 * @profile: Profile number to create.
869 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
871 static struct tomoyo_profile *tomoyo_find_or_assign_new_profile(const unsigned
874 static DEFINE_MUTEX(lock);
875 struct tomoyo_profile *ptr = NULL;
878 if (profile >= TOMOYO_MAX_PROFILES)
881 ptr = tomoyo_profile_ptr[profile];
884 ptr = tomoyo_alloc_element(sizeof(*ptr));
887 for (i = 0; i < TOMOYO_MAX_CONTROL_INDEX; i++)
888 ptr->value[i] = tomoyo_control_array[i].current_value;
889 mb(); /* Avoid out-of-order execution. */
890 tomoyo_profile_ptr[profile] = ptr;
897 * tomoyo_write_profile - Write to profile table.
899 * @head: Pointer to "struct tomoyo_io_buffer".
901 * Returns 0 on success, negative value otherwise.
903 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
905 char *data = head->write_buf;
909 struct tomoyo_profile *profile;
912 cp = strchr(data, '-');
915 if (strict_strtoul(data, 10, &num))
919 profile = tomoyo_find_or_assign_new_profile(num);
922 cp = strchr(data, '=');
926 if (!strcmp(data, "COMMENT")) {
927 profile->comment = tomoyo_save_name(cp + 1);
930 for (i = 0; i < TOMOYO_MAX_CONTROL_INDEX; i++) {
931 if (strcmp(data, tomoyo_control_array[i].keyword))
933 if (sscanf(cp + 1, "%u", &value) != 1) {
938 modes = tomoyo_mode_2;
941 modes = tomoyo_mode_4;
944 for (j = 0; j < 4; j++) {
945 if (strcmp(cp + 1, modes[j]))
952 } else if (value > tomoyo_control_array[i].max_value) {
953 value = tomoyo_control_array[i].max_value;
955 profile->value[i] = value;
962 * tomoyo_read_profile - Read from profile table.
964 * @head: Pointer to "struct tomoyo_io_buffer".
968 static int tomoyo_read_profile(struct tomoyo_io_buffer *head)
970 static const int total = TOMOYO_MAX_CONTROL_INDEX + 1;
975 for (step = head->read_step; step < TOMOYO_MAX_PROFILES * total;
977 const u8 index = step / total;
978 u8 type = step % total;
979 const struct tomoyo_profile *profile
980 = tomoyo_profile_ptr[index];
981 head->read_step = step;
984 if (!type) { /* Print profile' comment tag. */
985 if (!tomoyo_io_printf(head, "%u-COMMENT=%s\n",
986 index, profile->comment ?
987 profile->comment->name : ""))
992 if (type < TOMOYO_MAX_CONTROL_INDEX) {
993 const unsigned int value = profile->value[type];
994 const char **modes = NULL;
996 = tomoyo_control_array[type].keyword;
997 switch (tomoyo_control_array[type].max_value) {
999 modes = tomoyo_mode_4;
1002 modes = tomoyo_mode_2;
1006 if (!tomoyo_io_printf(head, "%u-%s=%s\n", index,
1007 keyword, modes[value]))
1010 if (!tomoyo_io_printf(head, "%u-%s=%u\n", index,
1016 if (step == TOMOYO_MAX_PROFILES * total)
1017 head->read_eof = true;
1022 * tomoyo_policy_manager_entry is a structure which is used for holding list of
1023 * domainnames or programs which are permitted to modify configuration via
1024 * /sys/kernel/security/tomoyo/ interface.
1025 * It has following fields.
1027 * (1) "list" which is linked to tomoyo_policy_manager_list .
1028 * (2) "manager" is a domainname or a program's pathname.
1029 * (3) "is_domain" is a bool which is true if "manager" is a domainname, false
1031 * (4) "is_deleted" is a bool which is true if marked as deleted, false
1034 struct tomoyo_policy_manager_entry {
1035 struct list_head list;
1036 /* A path to program or a domainname. */
1037 const struct tomoyo_path_info *manager;
1038 bool is_domain; /* True if manager is a domainname. */
1039 bool is_deleted; /* True if this entry is deleted. */
1043 * tomoyo_policy_manager_list is used for holding list of domainnames or
1044 * programs which are permitted to modify configuration via
1045 * /sys/kernel/security/tomoyo/ interface.
1047 * An entry is added by
1049 * # echo '<kernel> /sbin/mingetty /bin/login /bin/bash' > \
1050 * /sys/kernel/security/tomoyo/manager
1051 * (if you want to specify by a domainname)
1055 * # echo '/usr/lib/ccs/editpolicy' > /sys/kernel/security/tomoyo/manager
1056 * (if you want to specify by a program's location)
1060 * # echo 'delete <kernel> /sbin/mingetty /bin/login /bin/bash' > \
1061 * /sys/kernel/security/tomoyo/manager
1065 * # echo 'delete /usr/lib/ccs/editpolicy' > \
1066 * /sys/kernel/security/tomoyo/manager
1068 * and all entries are retrieved by
1070 * # cat /sys/kernel/security/tomoyo/manager
1072 static LIST_HEAD(tomoyo_policy_manager_list);
1073 static DECLARE_RWSEM(tomoyo_policy_manager_list_lock);
1076 * tomoyo_update_manager_entry - Add a manager entry.
1078 * @manager: The path to manager or the domainnamme.
1079 * @is_delete: True if it is a delete request.
1081 * Returns 0 on success, negative value otherwise.
1083 static int tomoyo_update_manager_entry(const char *manager,
1084 const bool is_delete)
1086 struct tomoyo_policy_manager_entry *new_entry;
1087 struct tomoyo_policy_manager_entry *ptr;
1088 const struct tomoyo_path_info *saved_manager;
1089 int error = -ENOMEM;
1090 bool is_domain = false;
1092 if (tomoyo_is_domain_def(manager)) {
1093 if (!tomoyo_is_correct_domain(manager, __func__))
1097 if (!tomoyo_is_correct_path(manager, 1, -1, -1, __func__))
1100 saved_manager = tomoyo_save_name(manager);
1103 down_write(&tomoyo_policy_manager_list_lock);
1104 list_for_each_entry(ptr, &tomoyo_policy_manager_list, list) {
1105 if (ptr->manager != saved_manager)
1107 ptr->is_deleted = is_delete;
1115 new_entry = tomoyo_alloc_element(sizeof(*new_entry));
1118 new_entry->manager = saved_manager;
1119 new_entry->is_domain = is_domain;
1120 list_add_tail(&new_entry->list, &tomoyo_policy_manager_list);
1123 up_write(&tomoyo_policy_manager_list_lock);
1128 * tomoyo_write_manager_policy - Write manager policy.
1130 * @head: Pointer to "struct tomoyo_io_buffer".
1132 * Returns 0 on success, negative value otherwise.
1134 static int tomoyo_write_manager_policy(struct tomoyo_io_buffer *head)
1136 char *data = head->write_buf;
1137 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
1139 if (!strcmp(data, "manage_by_non_root")) {
1140 tomoyo_manage_by_non_root = !is_delete;
1143 return tomoyo_update_manager_entry(data, is_delete);
1147 * tomoyo_read_manager_policy - Read manager policy.
1149 * @head: Pointer to "struct tomoyo_io_buffer".
1153 static int tomoyo_read_manager_policy(struct tomoyo_io_buffer *head)
1155 struct list_head *pos;
1160 down_read(&tomoyo_policy_manager_list_lock);
1161 list_for_each_cookie(pos, head->read_var2,
1162 &tomoyo_policy_manager_list) {
1163 struct tomoyo_policy_manager_entry *ptr;
1164 ptr = list_entry(pos, struct tomoyo_policy_manager_entry,
1166 if (ptr->is_deleted)
1168 done = tomoyo_io_printf(head, "%s\n", ptr->manager->name);
1172 up_read(&tomoyo_policy_manager_list_lock);
1173 head->read_eof = done;
1178 * tomoyo_is_policy_manager - Check whether the current process is a policy manager.
1180 * Returns true if the current process is permitted to modify policy
1181 * via /sys/kernel/security/tomoyo/ interface.
1183 static bool tomoyo_is_policy_manager(void)
1185 struct tomoyo_policy_manager_entry *ptr;
1187 const struct task_struct *task = current;
1188 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
1191 if (!tomoyo_policy_loaded)
1193 if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
1195 down_read(&tomoyo_policy_manager_list_lock);
1196 list_for_each_entry(ptr, &tomoyo_policy_manager_list, list) {
1197 if (!ptr->is_deleted && ptr->is_domain
1198 && !tomoyo_pathcmp(domainname, ptr->manager)) {
1203 up_read(&tomoyo_policy_manager_list_lock);
1206 exe = tomoyo_get_exe();
1209 down_read(&tomoyo_policy_manager_list_lock);
1210 list_for_each_entry(ptr, &tomoyo_policy_manager_list, list) {
1211 if (!ptr->is_deleted && !ptr->is_domain
1212 && !strcmp(exe, ptr->manager->name)) {
1217 up_read(&tomoyo_policy_manager_list_lock);
1218 if (!found) { /* Reduce error messages. */
1219 static pid_t last_pid;
1220 const pid_t pid = current->pid;
1221 if (last_pid != pid) {
1222 printk(KERN_WARNING "%s ( %s ) is not permitted to "
1223 "update policies.\n", domainname->name, exe);
1232 * tomoyo_is_select_one - Parse select command.
1234 * @head: Pointer to "struct tomoyo_io_buffer".
1235 * @data: String to parse.
1237 * Returns true on success, false otherwise.
1239 static bool tomoyo_is_select_one(struct tomoyo_io_buffer *head,
1243 struct tomoyo_domain_info *domain = NULL;
1245 if (sscanf(data, "pid=%u", &pid) == 1) {
1246 struct task_struct *p;
1247 read_lock(&tasklist_lock);
1248 p = find_task_by_vpid(pid);
1250 domain = tomoyo_real_domain(p);
1251 read_unlock(&tasklist_lock);
1252 } else if (!strncmp(data, "domain=", 7)) {
1253 if (tomoyo_is_domain_def(data + 7)) {
1254 down_read(&tomoyo_domain_list_lock);
1255 domain = tomoyo_find_domain(data + 7);
1256 up_read(&tomoyo_domain_list_lock);
1260 head->write_var1 = domain;
1261 /* Accessing read_buf is safe because head->io_sem is held. */
1262 if (!head->read_buf)
1263 return true; /* Do nothing if open(O_WRONLY). */
1264 head->read_avail = 0;
1265 tomoyo_io_printf(head, "# select %s\n", data);
1266 head->read_single_domain = true;
1267 head->read_eof = !domain;
1269 struct tomoyo_domain_info *d;
1270 head->read_var1 = NULL;
1271 down_read(&tomoyo_domain_list_lock);
1272 list_for_each_entry(d, &tomoyo_domain_list, list) {
1275 head->read_var1 = &d->list;
1277 up_read(&tomoyo_domain_list_lock);
1278 head->read_var2 = NULL;
1280 head->read_step = 0;
1281 if (domain->is_deleted)
1282 tomoyo_io_printf(head, "# This is a deleted domain.\n");
1288 * tomoyo_delete_domain - Delete a domain.
1290 * @domainname: The name of domain.
1294 static int tomoyo_delete_domain(char *domainname)
1296 struct tomoyo_domain_info *domain;
1297 struct tomoyo_path_info name;
1299 name.name = domainname;
1300 tomoyo_fill_path_info(&name);
1301 down_write(&tomoyo_domain_list_lock);
1302 /* Is there an active domain? */
1303 list_for_each_entry(domain, &tomoyo_domain_list, list) {
1304 /* Never delete tomoyo_kernel_domain */
1305 if (domain == &tomoyo_kernel_domain)
1307 if (domain->is_deleted ||
1308 tomoyo_pathcmp(domain->domainname, &name))
1310 domain->is_deleted = true;
1313 up_write(&tomoyo_domain_list_lock);
1318 * tomoyo_write_domain_policy - Write domain policy.
1320 * @head: Pointer to "struct tomoyo_io_buffer".
1322 * Returns 0 on success, negative value otherwise.
1324 static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head)
1326 char *data = head->write_buf;
1327 struct tomoyo_domain_info *domain = head->write_var1;
1328 bool is_delete = false;
1329 bool is_select = false;
1330 unsigned int profile;
1332 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE))
1334 else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT))
1336 if (is_select && tomoyo_is_select_one(head, data))
1338 /* Don't allow updating policies by non manager programs. */
1339 if (!tomoyo_is_policy_manager())
1341 if (tomoyo_is_domain_def(data)) {
1344 tomoyo_delete_domain(data);
1345 else if (is_select) {
1346 down_read(&tomoyo_domain_list_lock);
1347 domain = tomoyo_find_domain(data);
1348 up_read(&tomoyo_domain_list_lock);
1350 domain = tomoyo_find_or_assign_new_domain(data, 0);
1351 head->write_var1 = domain;
1357 if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1
1358 && profile < TOMOYO_MAX_PROFILES) {
1359 if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)
1360 domain->profile = (u8) profile;
1363 if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) {
1364 tomoyo_set_domain_flag(domain, is_delete,
1365 TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ);
1368 return tomoyo_write_file_policy(data, domain, is_delete);
1372 * tomoyo_print_single_path_acl - Print a single path ACL entry.
1374 * @head: Pointer to "struct tomoyo_io_buffer".
1375 * @ptr: Pointer to "struct tomoyo_single_path_acl_record".
1377 * Returns true on success, false otherwise.
1379 static bool tomoyo_print_single_path_acl(struct tomoyo_io_buffer *head,
1380 struct tomoyo_single_path_acl_record *
1385 const char *atmark = "";
1386 const char *filename;
1387 const u16 perm = ptr->perm;
1389 filename = ptr->filename->name;
1390 for (bit = head->read_bit; bit < TOMOYO_MAX_SINGLE_PATH_OPERATION;
1393 if (!(perm & (1 << bit)))
1395 /* Print "read/write" instead of "read" and "write". */
1396 if ((bit == TOMOYO_TYPE_READ_ACL ||
1397 bit == TOMOYO_TYPE_WRITE_ACL)
1398 && (perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL)))
1400 msg = tomoyo_sp2keyword(bit);
1401 pos = head->read_avail;
1402 if (!tomoyo_io_printf(head, "allow_%s %s%s\n", msg,
1409 head->read_bit = bit;
1410 head->read_avail = pos;
1415 * tomoyo_print_double_path_acl - Print a double path ACL entry.
1417 * @head: Pointer to "struct tomoyo_io_buffer".
1418 * @ptr: Pointer to "struct tomoyo_double_path_acl_record".
1420 * Returns true on success, false otherwise.
1422 static bool tomoyo_print_double_path_acl(struct tomoyo_io_buffer *head,
1423 struct tomoyo_double_path_acl_record *
1427 const char *atmark1 = "";
1428 const char *atmark2 = "";
1429 const char *filename1;
1430 const char *filename2;
1431 const u8 perm = ptr->perm;
1434 filename1 = ptr->filename1->name;
1435 filename2 = ptr->filename2->name;
1436 for (bit = head->read_bit; bit < TOMOYO_MAX_DOUBLE_PATH_OPERATION;
1439 if (!(perm & (1 << bit)))
1441 msg = tomoyo_dp2keyword(bit);
1442 pos = head->read_avail;
1443 if (!tomoyo_io_printf(head, "allow_%s %s%s %s%s\n", msg,
1444 atmark1, filename1, atmark2, filename2))
1450 head->read_bit = bit;
1451 head->read_avail = pos;
1456 * tomoyo_print_entry - Print an ACL entry.
1458 * @head: Pointer to "struct tomoyo_io_buffer".
1459 * @ptr: Pointer to an ACL entry.
1461 * Returns true on success, false otherwise.
1463 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1464 struct tomoyo_acl_info *ptr)
1466 const u8 acl_type = tomoyo_acl_type2(ptr);
1468 if (acl_type & TOMOYO_ACL_DELETED)
1470 if (acl_type == TOMOYO_TYPE_SINGLE_PATH_ACL) {
1471 struct tomoyo_single_path_acl_record *acl
1473 struct tomoyo_single_path_acl_record,
1475 return tomoyo_print_single_path_acl(head, acl);
1477 if (acl_type == TOMOYO_TYPE_DOUBLE_PATH_ACL) {
1478 struct tomoyo_double_path_acl_record *acl
1480 struct tomoyo_double_path_acl_record,
1482 return tomoyo_print_double_path_acl(head, acl);
1484 BUG(); /* This must not happen. */
1489 * tomoyo_read_domain_policy - Read domain policy.
1491 * @head: Pointer to "struct tomoyo_io_buffer".
1495 static int tomoyo_read_domain_policy(struct tomoyo_io_buffer *head)
1497 struct list_head *dpos;
1498 struct list_head *apos;
1503 if (head->read_step == 0)
1504 head->read_step = 1;
1505 down_read(&tomoyo_domain_list_lock);
1506 list_for_each_cookie(dpos, head->read_var1, &tomoyo_domain_list) {
1507 struct tomoyo_domain_info *domain;
1508 const char *quota_exceeded = "";
1509 const char *transition_failed = "";
1510 const char *ignore_global_allow_read = "";
1511 domain = list_entry(dpos, struct tomoyo_domain_info, list);
1512 if (head->read_step != 1)
1514 if (domain->is_deleted && !head->read_single_domain)
1516 /* Print domainname and flags. */
1517 if (domain->quota_warned)
1518 quota_exceeded = "quota_exceeded\n";
1519 if (domain->flags & TOMOYO_DOMAIN_FLAGS_TRANSITION_FAILED)
1520 transition_failed = "transition_failed\n";
1522 TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ)
1523 ignore_global_allow_read
1524 = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n";
1525 done = tomoyo_io_printf(head, "%s\n" TOMOYO_KEYWORD_USE_PROFILE
1527 domain->domainname->name,
1528 domain->profile, quota_exceeded,
1530 ignore_global_allow_read);
1533 head->read_step = 2;
1535 if (head->read_step == 3)
1537 /* Print ACL entries in the domain. */
1538 down_read(&tomoyo_domain_acl_info_list_lock);
1539 list_for_each_cookie(apos, head->read_var2,
1540 &domain->acl_info_list) {
1541 struct tomoyo_acl_info *ptr
1542 = list_entry(apos, struct tomoyo_acl_info,
1544 done = tomoyo_print_entry(head, ptr);
1548 up_read(&tomoyo_domain_acl_info_list_lock);
1551 head->read_step = 3;
1553 done = tomoyo_io_printf(head, "\n");
1556 head->read_step = 1;
1557 if (head->read_single_domain)
1560 up_read(&tomoyo_domain_list_lock);
1561 head->read_eof = done;
1566 * tomoyo_write_domain_profile - Assign profile for specified domain.
1568 * @head: Pointer to "struct tomoyo_io_buffer".
1570 * Returns 0 on success, -EINVAL otherwise.
1572 * This is equivalent to doing
1574 * ( echo "select " $domainname; echo "use_profile " $profile ) |
1575 * /usr/lib/ccs/loadpolicy -d
1577 static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head)
1579 char *data = head->write_buf;
1580 char *cp = strchr(data, ' ');
1581 struct tomoyo_domain_info *domain;
1582 unsigned long profile;
1587 down_read(&tomoyo_domain_list_lock);
1588 domain = tomoyo_find_domain(cp + 1);
1589 up_read(&tomoyo_domain_list_lock);
1590 if (strict_strtoul(data, 10, &profile))
1592 if (domain && profile < TOMOYO_MAX_PROFILES
1593 && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded))
1594 domain->profile = (u8) profile;
1599 * tomoyo_read_domain_profile - Read only domainname and profile.
1601 * @head: Pointer to "struct tomoyo_io_buffer".
1603 * Returns list of profile number and domainname pairs.
1605 * This is equivalent to doing
1607 * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
1608 * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" )
1609 * domainname = $0; } else if ( $1 == "use_profile" ) {
1610 * print $2 " " domainname; domainname = ""; } } ; '
1612 static int tomoyo_read_domain_profile(struct tomoyo_io_buffer *head)
1614 struct list_head *pos;
1619 down_read(&tomoyo_domain_list_lock);
1620 list_for_each_cookie(pos, head->read_var1, &tomoyo_domain_list) {
1621 struct tomoyo_domain_info *domain;
1622 domain = list_entry(pos, struct tomoyo_domain_info, list);
1623 if (domain->is_deleted)
1625 done = tomoyo_io_printf(head, "%u %s\n", domain->profile,
1626 domain->domainname->name);
1630 up_read(&tomoyo_domain_list_lock);
1631 head->read_eof = done;
1636 * tomoyo_write_pid: Specify PID to obtain domainname.
1638 * @head: Pointer to "struct tomoyo_io_buffer".
1642 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1645 /* No error check. */
1646 strict_strtoul(head->write_buf, 10, &pid);
1647 head->read_step = (int) pid;
1648 head->read_eof = false;
1653 * tomoyo_read_pid - Get domainname of the specified PID.
1655 * @head: Pointer to "struct tomoyo_io_buffer".
1657 * Returns the domainname which the specified PID is in on success,
1658 * empty string otherwise.
1659 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1660 * using read()/write() interface rather than sysctl() interface.
1662 static int tomoyo_read_pid(struct tomoyo_io_buffer *head)
1664 if (head->read_avail == 0 && !head->read_eof) {
1665 const int pid = head->read_step;
1666 struct task_struct *p;
1667 struct tomoyo_domain_info *domain = NULL;
1668 read_lock(&tasklist_lock);
1669 p = find_task_by_vpid(pid);
1671 domain = tomoyo_real_domain(p);
1672 read_unlock(&tasklist_lock);
1674 tomoyo_io_printf(head, "%d %u %s", pid, domain->profile,
1675 domain->domainname->name);
1676 head->read_eof = true;
1682 * tomoyo_write_exception_policy - Write exception policy.
1684 * @head: Pointer to "struct tomoyo_io_buffer".
1686 * Returns 0 on success, negative value otherwise.
1688 static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head)
1690 char *data = head->write_buf;
1691 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
1693 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_KEEP_DOMAIN))
1694 return tomoyo_write_domain_keeper_policy(data, false,
1696 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_KEEP_DOMAIN))
1697 return tomoyo_write_domain_keeper_policy(data, true, is_delete);
1698 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_INITIALIZE_DOMAIN))
1699 return tomoyo_write_domain_initializer_policy(data, false,
1701 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN))
1702 return tomoyo_write_domain_initializer_policy(data, true,
1704 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALIAS))
1705 return tomoyo_write_alias_policy(data, is_delete);
1706 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ))
1707 return tomoyo_write_globally_readable_policy(data, is_delete);
1708 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN))
1709 return tomoyo_write_pattern_policy(data, is_delete);
1710 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE))
1711 return tomoyo_write_no_rewrite_policy(data, is_delete);
1716 * tomoyo_read_exception_policy - Read exception policy.
1718 * @head: Pointer to "struct tomoyo_io_buffer".
1720 * Returns 0 on success, -EINVAL otherwise.
1722 static int tomoyo_read_exception_policy(struct tomoyo_io_buffer *head)
1724 if (!head->read_eof) {
1725 switch (head->read_step) {
1727 head->read_var2 = NULL;
1728 head->read_step = 1;
1730 if (!tomoyo_read_domain_keeper_policy(head))
1732 head->read_var2 = NULL;
1733 head->read_step = 2;
1735 if (!tomoyo_read_globally_readable_policy(head))
1737 head->read_var2 = NULL;
1738 head->read_step = 3;
1740 head->read_var2 = NULL;
1741 head->read_step = 4;
1743 if (!tomoyo_read_domain_initializer_policy(head))
1745 head->read_var2 = NULL;
1746 head->read_step = 5;
1748 if (!tomoyo_read_alias_policy(head))
1750 head->read_var2 = NULL;
1751 head->read_step = 6;
1753 head->read_var2 = NULL;
1754 head->read_step = 7;
1756 if (!tomoyo_read_file_pattern(head))
1758 head->read_var2 = NULL;
1759 head->read_step = 8;
1761 if (!tomoyo_read_no_rewrite_policy(head))
1763 head->read_var2 = NULL;
1764 head->read_step = 9;
1766 head->read_eof = true;
1775 /* path to policy loader */
1776 static const char *tomoyo_loader = "/sbin/tomoyo-init";
1779 * tomoyo_policy_loader_exists - Check whether /sbin/tomoyo-init exists.
1781 * Returns true if /sbin/tomoyo-init exists, false otherwise.
1783 static bool tomoyo_policy_loader_exists(void)
1786 * Don't activate MAC if the policy loader doesn't exist.
1787 * If the initrd includes /sbin/init but real-root-dev has not
1788 * mounted on / yet, activating MAC will block the system since
1789 * policies are not loaded yet.
1790 * Thus, let do_execve() call this function everytime.
1794 if (kern_path(tomoyo_loader, LOOKUP_FOLLOW, &path)) {
1795 printk(KERN_INFO "Not activating Mandatory Access Control now "
1796 "since %s doesn't exist.\n", tomoyo_loader);
1804 * tomoyo_load_policy - Run external policy loader to load policy.
1806 * @filename: The program about to start.
1808 * This function checks whether @filename is /sbin/init , and if so
1809 * invoke /sbin/tomoyo-init and wait for the termination of /sbin/tomoyo-init
1810 * and then continues invocation of /sbin/init.
1811 * /sbin/tomoyo-init reads policy files in /etc/tomoyo/ directory and
1812 * writes to /sys/kernel/security/tomoyo/ interfaces.
1816 void tomoyo_load_policy(const char *filename)
1821 if (tomoyo_policy_loaded)
1824 * Check filename is /sbin/init or /sbin/tomoyo-start.
1825 * /sbin/tomoyo-start is a dummy filename in case where /sbin/init can't
1827 * You can create /sbin/tomoyo-start by
1828 * "ln -s /bin/true /sbin/tomoyo-start".
1830 if (strcmp(filename, "/sbin/init") &&
1831 strcmp(filename, "/sbin/tomoyo-start"))
1833 if (!tomoyo_policy_loader_exists())
1836 printk(KERN_INFO "Calling %s to load policy. Please wait.\n",
1838 argv[0] = (char *) tomoyo_loader;
1841 envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
1843 call_usermodehelper(argv[0], argv, envp, 1);
1845 printk(KERN_INFO "TOMOYO: 2.2.0 2009/04/01\n");
1846 printk(KERN_INFO "Mandatory Access Control activated.\n");
1847 tomoyo_policy_loaded = true;
1848 { /* Check all profiles currently assigned to domains are defined. */
1849 struct tomoyo_domain_info *domain;
1850 down_read(&tomoyo_domain_list_lock);
1851 list_for_each_entry(domain, &tomoyo_domain_list, list) {
1852 const u8 profile = domain->profile;
1853 if (tomoyo_profile_ptr[profile])
1855 panic("Profile %u (used by '%s') not defined.\n",
1856 profile, domain->domainname->name);
1858 up_read(&tomoyo_domain_list_lock);
1863 * tomoyo_read_version: Get version.
1865 * @head: Pointer to "struct tomoyo_io_buffer".
1867 * Returns version information.
1869 static int tomoyo_read_version(struct tomoyo_io_buffer *head)
1871 if (!head->read_eof) {
1872 tomoyo_io_printf(head, "2.2.0");
1873 head->read_eof = true;
1879 * tomoyo_read_self_domain - Get the current process's domainname.
1881 * @head: Pointer to "struct tomoyo_io_buffer".
1883 * Returns the current process's domainname.
1885 static int tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
1887 if (!head->read_eof) {
1889 * tomoyo_domain()->domainname != NULL
1890 * because every process belongs to a domain and
1891 * the domain's name cannot be NULL.
1893 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
1894 head->read_eof = true;
1900 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
1902 * @type: Type of interface.
1903 * @file: Pointer to "struct file".
1905 * Associates policy handler and returns 0 on success, -ENOMEM otherwise.
1907 static int tomoyo_open_control(const u8 type, struct file *file)
1909 struct tomoyo_io_buffer *head = tomoyo_alloc(sizeof(*head));
1913 mutex_init(&head->io_sem);
1915 case TOMOYO_DOMAINPOLICY:
1916 /* /sys/kernel/security/tomoyo/domain_policy */
1917 head->write = tomoyo_write_domain_policy;
1918 head->read = tomoyo_read_domain_policy;
1920 case TOMOYO_EXCEPTIONPOLICY:
1921 /* /sys/kernel/security/tomoyo/exception_policy */
1922 head->write = tomoyo_write_exception_policy;
1923 head->read = tomoyo_read_exception_policy;
1925 case TOMOYO_SELFDOMAIN:
1926 /* /sys/kernel/security/tomoyo/self_domain */
1927 head->read = tomoyo_read_self_domain;
1929 case TOMOYO_DOMAIN_STATUS:
1930 /* /sys/kernel/security/tomoyo/.domain_status */
1931 head->write = tomoyo_write_domain_profile;
1932 head->read = tomoyo_read_domain_profile;
1934 case TOMOYO_PROCESS_STATUS:
1935 /* /sys/kernel/security/tomoyo/.process_status */
1936 head->write = tomoyo_write_pid;
1937 head->read = tomoyo_read_pid;
1939 case TOMOYO_VERSION:
1940 /* /sys/kernel/security/tomoyo/version */
1941 head->read = tomoyo_read_version;
1942 head->readbuf_size = 128;
1944 case TOMOYO_MEMINFO:
1945 /* /sys/kernel/security/tomoyo/meminfo */
1946 head->write = tomoyo_write_memory_quota;
1947 head->read = tomoyo_read_memory_counter;
1948 head->readbuf_size = 512;
1950 case TOMOYO_PROFILE:
1951 /* /sys/kernel/security/tomoyo/profile */
1952 head->write = tomoyo_write_profile;
1953 head->read = tomoyo_read_profile;
1955 case TOMOYO_MANAGER:
1956 /* /sys/kernel/security/tomoyo/manager */
1957 head->write = tomoyo_write_manager_policy;
1958 head->read = tomoyo_read_manager_policy;
1961 if (!(file->f_mode & FMODE_READ)) {
1963 * No need to allocate read_buf since it is not opened
1968 if (!head->readbuf_size)
1969 head->readbuf_size = 4096 * 2;
1970 head->read_buf = tomoyo_alloc(head->readbuf_size);
1971 if (!head->read_buf) {
1976 if (!(file->f_mode & FMODE_WRITE)) {
1978 * No need to allocate write_buf since it is not opened
1982 } else if (head->write) {
1983 head->writebuf_size = 4096 * 2;
1984 head->write_buf = tomoyo_alloc(head->writebuf_size);
1985 if (!head->write_buf) {
1986 tomoyo_free(head->read_buf);
1991 file->private_data = head;
1993 * Call the handler now if the file is
1994 * /sys/kernel/security/tomoyo/self_domain
1995 * so that the user can use
1996 * cat < /sys/kernel/security/tomoyo/self_domain"
1997 * to know the current process's domainname.
1999 if (type == TOMOYO_SELFDOMAIN)
2000 tomoyo_read_control(file, NULL, 0);
2005 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2007 * @file: Pointer to "struct file".
2008 * @buffer: Poiner to buffer to write to.
2009 * @buffer_len: Size of @buffer.
2011 * Returns bytes read on success, negative value otherwise.
2013 static int tomoyo_read_control(struct file *file, char __user *buffer,
2014 const int buffer_len)
2017 struct tomoyo_io_buffer *head = file->private_data;
2022 if (mutex_lock_interruptible(&head->io_sem))
2024 /* Call the policy handler. */
2025 len = head->read(head);
2028 /* Write to buffer. */
2029 len = head->read_avail;
2030 if (len > buffer_len)
2034 /* head->read_buf changes by some functions. */
2035 cp = head->read_buf;
2036 if (copy_to_user(buffer, cp, len)) {
2040 head->read_avail -= len;
2041 memmove(cp, cp + len, head->read_avail);
2043 mutex_unlock(&head->io_sem);
2048 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2050 * @file: Pointer to "struct file".
2051 * @buffer: Pointer to buffer to read from.
2052 * @buffer_len: Size of @buffer.
2054 * Returns @buffer_len on success, negative value otherwise.
2056 static int tomoyo_write_control(struct file *file, const char __user *buffer,
2057 const int buffer_len)
2059 struct tomoyo_io_buffer *head = file->private_data;
2060 int error = buffer_len;
2061 int avail_len = buffer_len;
2062 char *cp0 = head->write_buf;
2066 if (!access_ok(VERIFY_READ, buffer, buffer_len))
2068 /* Don't allow updating policies by non manager programs. */
2069 if (head->write != tomoyo_write_pid &&
2070 head->write != tomoyo_write_domain_policy &&
2071 !tomoyo_is_policy_manager())
2073 if (mutex_lock_interruptible(&head->io_sem))
2075 /* Read a line and dispatch it to the policy handler. */
2076 while (avail_len > 0) {
2078 if (head->write_avail >= head->writebuf_size - 1) {
2081 } else if (get_user(c, buffer)) {
2087 cp0[head->write_avail++] = c;
2090 cp0[head->write_avail - 1] = '\0';
2091 head->write_avail = 0;
2092 tomoyo_normalize_line(cp0);
2095 mutex_unlock(&head->io_sem);
2100 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2102 * @file: Pointer to "struct file".
2104 * Releases memory and returns 0.
2106 static int tomoyo_close_control(struct file *file)
2108 struct tomoyo_io_buffer *head = file->private_data;
2110 /* Release memory used for policy I/O. */
2111 tomoyo_free(head->read_buf);
2112 head->read_buf = NULL;
2113 tomoyo_free(head->write_buf);
2114 head->write_buf = NULL;
2117 file->private_data = NULL;
2122 * tomoyo_alloc_acl_element - Allocate permanent memory for ACL entry.
2124 * @acl_type: Type of ACL entry.
2126 * Returns pointer to the ACL entry on success, NULL otherwise.
2128 void *tomoyo_alloc_acl_element(const u8 acl_type)
2131 struct tomoyo_acl_info *ptr;
2134 case TOMOYO_TYPE_SINGLE_PATH_ACL:
2135 len = sizeof(struct tomoyo_single_path_acl_record);
2137 case TOMOYO_TYPE_DOUBLE_PATH_ACL:
2138 len = sizeof(struct tomoyo_double_path_acl_record);
2143 ptr = tomoyo_alloc_element(len);
2146 ptr->type = acl_type;
2151 * tomoyo_open - open() for /sys/kernel/security/tomoyo/ interface.
2153 * @inode: Pointer to "struct inode".
2154 * @file: Pointer to "struct file".
2156 * Returns 0 on success, negative value otherwise.
2158 static int tomoyo_open(struct inode *inode, struct file *file)
2160 const int key = ((u8 *) file->f_path.dentry->d_inode->i_private)
2162 return tomoyo_open_control(key, file);
2166 * tomoyo_release - close() for /sys/kernel/security/tomoyo/ interface.
2168 * @inode: Pointer to "struct inode".
2169 * @file: Pointer to "struct file".
2171 * Returns 0 on success, negative value otherwise.
2173 static int tomoyo_release(struct inode *inode, struct file *file)
2175 return tomoyo_close_control(file);
2179 * tomoyo_read - read() for /sys/kernel/security/tomoyo/ interface.
2181 * @file: Pointer to "struct file".
2182 * @buf: Pointer to buffer.
2183 * @count: Size of @buf.
2186 * Returns bytes read on success, negative value otherwise.
2188 static ssize_t tomoyo_read(struct file *file, char __user *buf, size_t count,
2191 return tomoyo_read_control(file, buf, count);
2195 * tomoyo_write - write() for /sys/kernel/security/tomoyo/ interface.
2197 * @file: Pointer to "struct file".
2198 * @buf: Pointer to buffer.
2199 * @count: Size of @buf.
2202 * Returns @count on success, negative value otherwise.
2204 static ssize_t tomoyo_write(struct file *file, const char __user *buf,
2205 size_t count, loff_t *ppos)
2207 return tomoyo_write_control(file, buf, count);
2211 * tomoyo_operations is a "struct file_operations" which is used for handling
2212 * /sys/kernel/security/tomoyo/ interface.
2214 * Some files under /sys/kernel/security/tomoyo/ directory accept open(O_RDWR).
2215 * See tomoyo_io_buffer for internals.
2217 static const struct file_operations tomoyo_operations = {
2218 .open = tomoyo_open,
2219 .release = tomoyo_release,
2220 .read = tomoyo_read,
2221 .write = tomoyo_write,
2225 * tomoyo_create_entry - Create interface files under /sys/kernel/security/tomoyo/ directory.
2227 * @name: The name of the interface file.
2228 * @mode: The permission of the interface file.
2229 * @parent: The parent directory.
2230 * @key: Type of interface.
2234 static void __init tomoyo_create_entry(const char *name, const mode_t mode,
2235 struct dentry *parent, const u8 key)
2237 securityfs_create_file(name, mode, parent, ((u8 *) NULL) + key,
2238 &tomoyo_operations);
2242 * tomoyo_initerface_init - Initialize /sys/kernel/security/tomoyo/ interface.
2246 static int __init tomoyo_initerface_init(void)
2248 struct dentry *tomoyo_dir;
2250 /* Don't create securityfs entries unless registered. */
2251 if (current_cred()->security != &tomoyo_kernel_domain)
2254 tomoyo_dir = securityfs_create_dir("tomoyo", NULL);
2255 tomoyo_create_entry("domain_policy", 0600, tomoyo_dir,
2256 TOMOYO_DOMAINPOLICY);
2257 tomoyo_create_entry("exception_policy", 0600, tomoyo_dir,
2258 TOMOYO_EXCEPTIONPOLICY);
2259 tomoyo_create_entry("self_domain", 0400, tomoyo_dir,
2261 tomoyo_create_entry(".domain_status", 0600, tomoyo_dir,
2262 TOMOYO_DOMAIN_STATUS);
2263 tomoyo_create_entry(".process_status", 0600, tomoyo_dir,
2264 TOMOYO_PROCESS_STATUS);
2265 tomoyo_create_entry("meminfo", 0600, tomoyo_dir,
2267 tomoyo_create_entry("profile", 0600, tomoyo_dir,
2269 tomoyo_create_entry("manager", 0600, tomoyo_dir,
2271 tomoyo_create_entry("version", 0400, tomoyo_dir,
2276 fs_initcall(tomoyo_initerface_init);