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_write_domain_policy - Write domain policy.
1290 * @head: Pointer to "struct tomoyo_io_buffer".
1292 * Returns 0 on success, negative value otherwise.
1294 static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head)
1296 char *data = head->write_buf;
1297 struct tomoyo_domain_info *domain = head->write_var1;
1298 bool is_delete = false;
1299 bool is_select = false;
1300 unsigned int profile;
1302 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE))
1304 else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT))
1306 if (is_select && tomoyo_is_select_one(head, data))
1308 /* Don't allow updating policies by non manager programs. */
1309 if (!tomoyo_is_policy_manager())
1311 if (tomoyo_is_domain_def(data)) {
1314 tomoyo_delete_domain(data);
1315 else if (is_select) {
1316 down_read(&tomoyo_domain_list_lock);
1317 domain = tomoyo_find_domain(data);
1318 up_read(&tomoyo_domain_list_lock);
1320 domain = tomoyo_find_or_assign_new_domain(data, 0);
1321 head->write_var1 = domain;
1327 if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1
1328 && profile < TOMOYO_MAX_PROFILES) {
1329 if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)
1330 domain->profile = (u8) profile;
1333 if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) {
1334 tomoyo_set_domain_flag(domain, is_delete,
1335 TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ);
1338 return tomoyo_write_file_policy(data, domain, is_delete);
1342 * tomoyo_print_single_path_acl - Print a single path ACL entry.
1344 * @head: Pointer to "struct tomoyo_io_buffer".
1345 * @ptr: Pointer to "struct tomoyo_single_path_acl_record".
1347 * Returns true on success, false otherwise.
1349 static bool tomoyo_print_single_path_acl(struct tomoyo_io_buffer *head,
1350 struct tomoyo_single_path_acl_record *
1355 const char *atmark = "";
1356 const char *filename;
1357 const u16 perm = ptr->perm;
1359 filename = ptr->filename->name;
1360 for (bit = head->read_bit; bit < TOMOYO_MAX_SINGLE_PATH_OPERATION;
1363 if (!(perm & (1 << bit)))
1365 /* Print "read/write" instead of "read" and "write". */
1366 if ((bit == TOMOYO_TYPE_READ_ACL ||
1367 bit == TOMOYO_TYPE_WRITE_ACL)
1368 && (perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL)))
1370 msg = tomoyo_sp2keyword(bit);
1371 pos = head->read_avail;
1372 if (!tomoyo_io_printf(head, "allow_%s %s%s\n", msg,
1379 head->read_bit = bit;
1380 head->read_avail = pos;
1385 * tomoyo_print_double_path_acl - Print a double path ACL entry.
1387 * @head: Pointer to "struct tomoyo_io_buffer".
1388 * @ptr: Pointer to "struct tomoyo_double_path_acl_record".
1390 * Returns true on success, false otherwise.
1392 static bool tomoyo_print_double_path_acl(struct tomoyo_io_buffer *head,
1393 struct tomoyo_double_path_acl_record *
1397 const char *atmark1 = "";
1398 const char *atmark2 = "";
1399 const char *filename1;
1400 const char *filename2;
1401 const u8 perm = ptr->perm;
1404 filename1 = ptr->filename1->name;
1405 filename2 = ptr->filename2->name;
1406 for (bit = head->read_bit; bit < TOMOYO_MAX_DOUBLE_PATH_OPERATION;
1409 if (!(perm & (1 << bit)))
1411 msg = tomoyo_dp2keyword(bit);
1412 pos = head->read_avail;
1413 if (!tomoyo_io_printf(head, "allow_%s %s%s %s%s\n", msg,
1414 atmark1, filename1, atmark2, filename2))
1420 head->read_bit = bit;
1421 head->read_avail = pos;
1426 * tomoyo_print_entry - Print an ACL entry.
1428 * @head: Pointer to "struct tomoyo_io_buffer".
1429 * @ptr: Pointer to an ACL entry.
1431 * Returns true on success, false otherwise.
1433 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1434 struct tomoyo_acl_info *ptr)
1436 const u8 acl_type = tomoyo_acl_type2(ptr);
1438 if (acl_type & TOMOYO_ACL_DELETED)
1440 if (acl_type == TOMOYO_TYPE_SINGLE_PATH_ACL) {
1441 struct tomoyo_single_path_acl_record *acl
1443 struct tomoyo_single_path_acl_record,
1445 return tomoyo_print_single_path_acl(head, acl);
1447 if (acl_type == TOMOYO_TYPE_DOUBLE_PATH_ACL) {
1448 struct tomoyo_double_path_acl_record *acl
1450 struct tomoyo_double_path_acl_record,
1452 return tomoyo_print_double_path_acl(head, acl);
1454 BUG(); /* This must not happen. */
1459 * tomoyo_read_domain_policy - Read domain policy.
1461 * @head: Pointer to "struct tomoyo_io_buffer".
1465 static int tomoyo_read_domain_policy(struct tomoyo_io_buffer *head)
1467 struct list_head *dpos;
1468 struct list_head *apos;
1473 if (head->read_step == 0)
1474 head->read_step = 1;
1475 down_read(&tomoyo_domain_list_lock);
1476 list_for_each_cookie(dpos, head->read_var1, &tomoyo_domain_list) {
1477 struct tomoyo_domain_info *domain;
1478 const char *quota_exceeded = "";
1479 const char *transition_failed = "";
1480 const char *ignore_global_allow_read = "";
1481 domain = list_entry(dpos, struct tomoyo_domain_info, list);
1482 if (head->read_step != 1)
1484 if (domain->is_deleted && !head->read_single_domain)
1486 /* Print domainname and flags. */
1487 if (domain->quota_warned)
1488 quota_exceeded = "quota_exceeded\n";
1489 if (domain->flags & TOMOYO_DOMAIN_FLAGS_TRANSITION_FAILED)
1490 transition_failed = "transition_failed\n";
1492 TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ)
1493 ignore_global_allow_read
1494 = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n";
1495 done = tomoyo_io_printf(head, "%s\n" TOMOYO_KEYWORD_USE_PROFILE
1497 domain->domainname->name,
1498 domain->profile, quota_exceeded,
1500 ignore_global_allow_read);
1503 head->read_step = 2;
1505 if (head->read_step == 3)
1507 /* Print ACL entries in the domain. */
1508 down_read(&tomoyo_domain_acl_info_list_lock);
1509 list_for_each_cookie(apos, head->read_var2,
1510 &domain->acl_info_list) {
1511 struct tomoyo_acl_info *ptr
1512 = list_entry(apos, struct tomoyo_acl_info,
1514 done = tomoyo_print_entry(head, ptr);
1518 up_read(&tomoyo_domain_acl_info_list_lock);
1521 head->read_step = 3;
1523 done = tomoyo_io_printf(head, "\n");
1526 head->read_step = 1;
1527 if (head->read_single_domain)
1530 up_read(&tomoyo_domain_list_lock);
1531 head->read_eof = done;
1536 * tomoyo_write_domain_profile - Assign profile for specified domain.
1538 * @head: Pointer to "struct tomoyo_io_buffer".
1540 * Returns 0 on success, -EINVAL otherwise.
1542 * This is equivalent to doing
1544 * ( echo "select " $domainname; echo "use_profile " $profile ) |
1545 * /usr/lib/ccs/loadpolicy -d
1547 static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head)
1549 char *data = head->write_buf;
1550 char *cp = strchr(data, ' ');
1551 struct tomoyo_domain_info *domain;
1552 unsigned long profile;
1557 down_read(&tomoyo_domain_list_lock);
1558 domain = tomoyo_find_domain(cp + 1);
1559 up_read(&tomoyo_domain_list_lock);
1560 if (strict_strtoul(data, 10, &profile))
1562 if (domain && profile < TOMOYO_MAX_PROFILES
1563 && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded))
1564 domain->profile = (u8) profile;
1569 * tomoyo_read_domain_profile - Read only domainname and profile.
1571 * @head: Pointer to "struct tomoyo_io_buffer".
1573 * Returns list of profile number and domainname pairs.
1575 * This is equivalent to doing
1577 * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
1578 * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" )
1579 * domainname = $0; } else if ( $1 == "use_profile" ) {
1580 * print $2 " " domainname; domainname = ""; } } ; '
1582 static int tomoyo_read_domain_profile(struct tomoyo_io_buffer *head)
1584 struct list_head *pos;
1589 down_read(&tomoyo_domain_list_lock);
1590 list_for_each_cookie(pos, head->read_var1, &tomoyo_domain_list) {
1591 struct tomoyo_domain_info *domain;
1592 domain = list_entry(pos, struct tomoyo_domain_info, list);
1593 if (domain->is_deleted)
1595 done = tomoyo_io_printf(head, "%u %s\n", domain->profile,
1596 domain->domainname->name);
1600 up_read(&tomoyo_domain_list_lock);
1601 head->read_eof = done;
1606 * tomoyo_write_pid: Specify PID to obtain domainname.
1608 * @head: Pointer to "struct tomoyo_io_buffer".
1612 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1615 /* No error check. */
1616 strict_strtoul(head->write_buf, 10, &pid);
1617 head->read_step = (int) pid;
1618 head->read_eof = false;
1623 * tomoyo_read_pid - Get domainname of the specified PID.
1625 * @head: Pointer to "struct tomoyo_io_buffer".
1627 * Returns the domainname which the specified PID is in on success,
1628 * empty string otherwise.
1629 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1630 * using read()/write() interface rather than sysctl() interface.
1632 static int tomoyo_read_pid(struct tomoyo_io_buffer *head)
1634 if (head->read_avail == 0 && !head->read_eof) {
1635 const int pid = head->read_step;
1636 struct task_struct *p;
1637 struct tomoyo_domain_info *domain = NULL;
1638 read_lock(&tasklist_lock);
1639 p = find_task_by_vpid(pid);
1641 domain = tomoyo_real_domain(p);
1642 read_unlock(&tasklist_lock);
1644 tomoyo_io_printf(head, "%d %u %s", pid, domain->profile,
1645 domain->domainname->name);
1646 head->read_eof = true;
1652 * tomoyo_write_exception_policy - Write exception policy.
1654 * @head: Pointer to "struct tomoyo_io_buffer".
1656 * Returns 0 on success, negative value otherwise.
1658 static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head)
1660 char *data = head->write_buf;
1661 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
1663 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_KEEP_DOMAIN))
1664 return tomoyo_write_domain_keeper_policy(data, false,
1666 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_KEEP_DOMAIN))
1667 return tomoyo_write_domain_keeper_policy(data, true, is_delete);
1668 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_INITIALIZE_DOMAIN))
1669 return tomoyo_write_domain_initializer_policy(data, false,
1671 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN))
1672 return tomoyo_write_domain_initializer_policy(data, true,
1674 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALIAS))
1675 return tomoyo_write_alias_policy(data, is_delete);
1676 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ))
1677 return tomoyo_write_globally_readable_policy(data, is_delete);
1678 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN))
1679 return tomoyo_write_pattern_policy(data, is_delete);
1680 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE))
1681 return tomoyo_write_no_rewrite_policy(data, is_delete);
1686 * tomoyo_read_exception_policy - Read exception policy.
1688 * @head: Pointer to "struct tomoyo_io_buffer".
1690 * Returns 0 on success, -EINVAL otherwise.
1692 static int tomoyo_read_exception_policy(struct tomoyo_io_buffer *head)
1694 if (!head->read_eof) {
1695 switch (head->read_step) {
1697 head->read_var2 = NULL;
1698 head->read_step = 1;
1700 if (!tomoyo_read_domain_keeper_policy(head))
1702 head->read_var2 = NULL;
1703 head->read_step = 2;
1705 if (!tomoyo_read_globally_readable_policy(head))
1707 head->read_var2 = NULL;
1708 head->read_step = 3;
1710 head->read_var2 = NULL;
1711 head->read_step = 4;
1713 if (!tomoyo_read_domain_initializer_policy(head))
1715 head->read_var2 = NULL;
1716 head->read_step = 5;
1718 if (!tomoyo_read_alias_policy(head))
1720 head->read_var2 = NULL;
1721 head->read_step = 6;
1723 head->read_var2 = NULL;
1724 head->read_step = 7;
1726 if (!tomoyo_read_file_pattern(head))
1728 head->read_var2 = NULL;
1729 head->read_step = 8;
1731 if (!tomoyo_read_no_rewrite_policy(head))
1733 head->read_var2 = NULL;
1734 head->read_step = 9;
1736 head->read_eof = true;
1745 /* path to policy loader */
1746 static const char *tomoyo_loader = "/sbin/tomoyo-init";
1749 * tomoyo_policy_loader_exists - Check whether /sbin/tomoyo-init exists.
1751 * Returns true if /sbin/tomoyo-init exists, false otherwise.
1753 static bool tomoyo_policy_loader_exists(void)
1756 * Don't activate MAC if the policy loader doesn't exist.
1757 * If the initrd includes /sbin/init but real-root-dev has not
1758 * mounted on / yet, activating MAC will block the system since
1759 * policies are not loaded yet.
1760 * Thus, let do_execve() call this function everytime.
1764 if (kern_path(tomoyo_loader, LOOKUP_FOLLOW, &path)) {
1765 printk(KERN_INFO "Not activating Mandatory Access Control now "
1766 "since %s doesn't exist.\n", tomoyo_loader);
1774 * tomoyo_load_policy - Run external policy loader to load policy.
1776 * @filename: The program about to start.
1778 * This function checks whether @filename is /sbin/init , and if so
1779 * invoke /sbin/tomoyo-init and wait for the termination of /sbin/tomoyo-init
1780 * and then continues invocation of /sbin/init.
1781 * /sbin/tomoyo-init reads policy files in /etc/tomoyo/ directory and
1782 * writes to /sys/kernel/security/tomoyo/ interfaces.
1786 void tomoyo_load_policy(const char *filename)
1791 if (tomoyo_policy_loaded)
1794 * Check filename is /sbin/init or /sbin/tomoyo-start.
1795 * /sbin/tomoyo-start is a dummy filename in case where /sbin/init can't
1797 * You can create /sbin/tomoyo-start by
1798 * "ln -s /bin/true /sbin/tomoyo-start".
1800 if (strcmp(filename, "/sbin/init") &&
1801 strcmp(filename, "/sbin/tomoyo-start"))
1803 if (!tomoyo_policy_loader_exists())
1806 printk(KERN_INFO "Calling %s to load policy. Please wait.\n",
1808 argv[0] = (char *) tomoyo_loader;
1811 envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
1813 call_usermodehelper(argv[0], argv, envp, 1);
1815 printk(KERN_INFO "TOMOYO: 2.2.0 2009/04/01\n");
1816 printk(KERN_INFO "Mandatory Access Control activated.\n");
1817 tomoyo_policy_loaded = true;
1818 { /* Check all profiles currently assigned to domains are defined. */
1819 struct tomoyo_domain_info *domain;
1820 down_read(&tomoyo_domain_list_lock);
1821 list_for_each_entry(domain, &tomoyo_domain_list, list) {
1822 const u8 profile = domain->profile;
1823 if (tomoyo_profile_ptr[profile])
1825 panic("Profile %u (used by '%s') not defined.\n",
1826 profile, domain->domainname->name);
1828 up_read(&tomoyo_domain_list_lock);
1833 * tomoyo_read_version: Get version.
1835 * @head: Pointer to "struct tomoyo_io_buffer".
1837 * Returns version information.
1839 static int tomoyo_read_version(struct tomoyo_io_buffer *head)
1841 if (!head->read_eof) {
1842 tomoyo_io_printf(head, "2.2.0");
1843 head->read_eof = true;
1849 * tomoyo_read_self_domain - Get the current process's domainname.
1851 * @head: Pointer to "struct tomoyo_io_buffer".
1853 * Returns the current process's domainname.
1855 static int tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
1857 if (!head->read_eof) {
1859 * tomoyo_domain()->domainname != NULL
1860 * because every process belongs to a domain and
1861 * the domain's name cannot be NULL.
1863 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
1864 head->read_eof = true;
1870 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
1872 * @type: Type of interface.
1873 * @file: Pointer to "struct file".
1875 * Associates policy handler and returns 0 on success, -ENOMEM otherwise.
1877 static int tomoyo_open_control(const u8 type, struct file *file)
1879 struct tomoyo_io_buffer *head = tomoyo_alloc(sizeof(*head));
1883 mutex_init(&head->io_sem);
1885 case TOMOYO_DOMAINPOLICY:
1886 /* /sys/kernel/security/tomoyo/domain_policy */
1887 head->write = tomoyo_write_domain_policy;
1888 head->read = tomoyo_read_domain_policy;
1890 case TOMOYO_EXCEPTIONPOLICY:
1891 /* /sys/kernel/security/tomoyo/exception_policy */
1892 head->write = tomoyo_write_exception_policy;
1893 head->read = tomoyo_read_exception_policy;
1895 case TOMOYO_SELFDOMAIN:
1896 /* /sys/kernel/security/tomoyo/self_domain */
1897 head->read = tomoyo_read_self_domain;
1899 case TOMOYO_DOMAIN_STATUS:
1900 /* /sys/kernel/security/tomoyo/.domain_status */
1901 head->write = tomoyo_write_domain_profile;
1902 head->read = tomoyo_read_domain_profile;
1904 case TOMOYO_PROCESS_STATUS:
1905 /* /sys/kernel/security/tomoyo/.process_status */
1906 head->write = tomoyo_write_pid;
1907 head->read = tomoyo_read_pid;
1909 case TOMOYO_VERSION:
1910 /* /sys/kernel/security/tomoyo/version */
1911 head->read = tomoyo_read_version;
1912 head->readbuf_size = 128;
1914 case TOMOYO_MEMINFO:
1915 /* /sys/kernel/security/tomoyo/meminfo */
1916 head->write = tomoyo_write_memory_quota;
1917 head->read = tomoyo_read_memory_counter;
1918 head->readbuf_size = 512;
1920 case TOMOYO_PROFILE:
1921 /* /sys/kernel/security/tomoyo/profile */
1922 head->write = tomoyo_write_profile;
1923 head->read = tomoyo_read_profile;
1925 case TOMOYO_MANAGER:
1926 /* /sys/kernel/security/tomoyo/manager */
1927 head->write = tomoyo_write_manager_policy;
1928 head->read = tomoyo_read_manager_policy;
1931 if (!(file->f_mode & FMODE_READ)) {
1933 * No need to allocate read_buf since it is not opened
1938 if (!head->readbuf_size)
1939 head->readbuf_size = 4096 * 2;
1940 head->read_buf = tomoyo_alloc(head->readbuf_size);
1941 if (!head->read_buf) {
1946 if (!(file->f_mode & FMODE_WRITE)) {
1948 * No need to allocate write_buf since it is not opened
1952 } else if (head->write) {
1953 head->writebuf_size = 4096 * 2;
1954 head->write_buf = tomoyo_alloc(head->writebuf_size);
1955 if (!head->write_buf) {
1956 tomoyo_free(head->read_buf);
1961 file->private_data = head;
1963 * Call the handler now if the file is
1964 * /sys/kernel/security/tomoyo/self_domain
1965 * so that the user can use
1966 * cat < /sys/kernel/security/tomoyo/self_domain"
1967 * to know the current process's domainname.
1969 if (type == TOMOYO_SELFDOMAIN)
1970 tomoyo_read_control(file, NULL, 0);
1975 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
1977 * @file: Pointer to "struct file".
1978 * @buffer: Poiner to buffer to write to.
1979 * @buffer_len: Size of @buffer.
1981 * Returns bytes read on success, negative value otherwise.
1983 static int tomoyo_read_control(struct file *file, char __user *buffer,
1984 const int buffer_len)
1987 struct tomoyo_io_buffer *head = file->private_data;
1992 if (mutex_lock_interruptible(&head->io_sem))
1994 /* Call the policy handler. */
1995 len = head->read(head);
1998 /* Write to buffer. */
1999 len = head->read_avail;
2000 if (len > buffer_len)
2004 /* head->read_buf changes by some functions. */
2005 cp = head->read_buf;
2006 if (copy_to_user(buffer, cp, len)) {
2010 head->read_avail -= len;
2011 memmove(cp, cp + len, head->read_avail);
2013 mutex_unlock(&head->io_sem);
2018 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2020 * @file: Pointer to "struct file".
2021 * @buffer: Pointer to buffer to read from.
2022 * @buffer_len: Size of @buffer.
2024 * Returns @buffer_len on success, negative value otherwise.
2026 static int tomoyo_write_control(struct file *file, const char __user *buffer,
2027 const int buffer_len)
2029 struct tomoyo_io_buffer *head = file->private_data;
2030 int error = buffer_len;
2031 int avail_len = buffer_len;
2032 char *cp0 = head->write_buf;
2036 if (!access_ok(VERIFY_READ, buffer, buffer_len))
2038 /* Don't allow updating policies by non manager programs. */
2039 if (head->write != tomoyo_write_pid &&
2040 head->write != tomoyo_write_domain_policy &&
2041 !tomoyo_is_policy_manager())
2043 if (mutex_lock_interruptible(&head->io_sem))
2045 /* Read a line and dispatch it to the policy handler. */
2046 while (avail_len > 0) {
2048 if (head->write_avail >= head->writebuf_size - 1) {
2051 } else if (get_user(c, buffer)) {
2057 cp0[head->write_avail++] = c;
2060 cp0[head->write_avail - 1] = '\0';
2061 head->write_avail = 0;
2062 tomoyo_normalize_line(cp0);
2065 mutex_unlock(&head->io_sem);
2070 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2072 * @file: Pointer to "struct file".
2074 * Releases memory and returns 0.
2076 static int tomoyo_close_control(struct file *file)
2078 struct tomoyo_io_buffer *head = file->private_data;
2080 /* Release memory used for policy I/O. */
2081 tomoyo_free(head->read_buf);
2082 head->read_buf = NULL;
2083 tomoyo_free(head->write_buf);
2084 head->write_buf = NULL;
2087 file->private_data = NULL;
2092 * tomoyo_alloc_acl_element - Allocate permanent memory for ACL entry.
2094 * @acl_type: Type of ACL entry.
2096 * Returns pointer to the ACL entry on success, NULL otherwise.
2098 void *tomoyo_alloc_acl_element(const u8 acl_type)
2101 struct tomoyo_acl_info *ptr;
2104 case TOMOYO_TYPE_SINGLE_PATH_ACL:
2105 len = sizeof(struct tomoyo_single_path_acl_record);
2107 case TOMOYO_TYPE_DOUBLE_PATH_ACL:
2108 len = sizeof(struct tomoyo_double_path_acl_record);
2113 ptr = tomoyo_alloc_element(len);
2116 ptr->type = acl_type;
2121 * tomoyo_open - open() for /sys/kernel/security/tomoyo/ interface.
2123 * @inode: Pointer to "struct inode".
2124 * @file: Pointer to "struct file".
2126 * Returns 0 on success, negative value otherwise.
2128 static int tomoyo_open(struct inode *inode, struct file *file)
2130 const int key = ((u8 *) file->f_path.dentry->d_inode->i_private)
2132 return tomoyo_open_control(key, file);
2136 * tomoyo_release - close() for /sys/kernel/security/tomoyo/ interface.
2138 * @inode: Pointer to "struct inode".
2139 * @file: Pointer to "struct file".
2141 * Returns 0 on success, negative value otherwise.
2143 static int tomoyo_release(struct inode *inode, struct file *file)
2145 return tomoyo_close_control(file);
2149 * tomoyo_read - read() for /sys/kernel/security/tomoyo/ interface.
2151 * @file: Pointer to "struct file".
2152 * @buf: Pointer to buffer.
2153 * @count: Size of @buf.
2156 * Returns bytes read on success, negative value otherwise.
2158 static ssize_t tomoyo_read(struct file *file, char __user *buf, size_t count,
2161 return tomoyo_read_control(file, buf, count);
2165 * tomoyo_write - write() for /sys/kernel/security/tomoyo/ interface.
2167 * @file: Pointer to "struct file".
2168 * @buf: Pointer to buffer.
2169 * @count: Size of @buf.
2172 * Returns @count on success, negative value otherwise.
2174 static ssize_t tomoyo_write(struct file *file, const char __user *buf,
2175 size_t count, loff_t *ppos)
2177 return tomoyo_write_control(file, buf, count);
2181 * tomoyo_operations is a "struct file_operations" which is used for handling
2182 * /sys/kernel/security/tomoyo/ interface.
2184 * Some files under /sys/kernel/security/tomoyo/ directory accept open(O_RDWR).
2185 * See tomoyo_io_buffer for internals.
2187 static const struct file_operations tomoyo_operations = {
2188 .open = tomoyo_open,
2189 .release = tomoyo_release,
2190 .read = tomoyo_read,
2191 .write = tomoyo_write,
2195 * tomoyo_create_entry - Create interface files under /sys/kernel/security/tomoyo/ directory.
2197 * @name: The name of the interface file.
2198 * @mode: The permission of the interface file.
2199 * @parent: The parent directory.
2200 * @key: Type of interface.
2204 static void __init tomoyo_create_entry(const char *name, const mode_t mode,
2205 struct dentry *parent, const u8 key)
2207 securityfs_create_file(name, mode, parent, ((u8 *) NULL) + key,
2208 &tomoyo_operations);
2212 * tomoyo_initerface_init - Initialize /sys/kernel/security/tomoyo/ interface.
2216 static int __init tomoyo_initerface_init(void)
2218 struct dentry *tomoyo_dir;
2220 /* Don't create securityfs entries unless registered. */
2221 if (current_cred()->security != &tomoyo_kernel_domain)
2224 tomoyo_dir = securityfs_create_dir("tomoyo", NULL);
2225 tomoyo_create_entry("domain_policy", 0600, tomoyo_dir,
2226 TOMOYO_DOMAINPOLICY);
2227 tomoyo_create_entry("exception_policy", 0600, tomoyo_dir,
2228 TOMOYO_EXCEPTIONPOLICY);
2229 tomoyo_create_entry("self_domain", 0400, tomoyo_dir,
2231 tomoyo_create_entry(".domain_status", 0600, tomoyo_dir,
2232 TOMOYO_DOMAIN_STATUS);
2233 tomoyo_create_entry(".process_status", 0600, tomoyo_dir,
2234 TOMOYO_PROCESS_STATUS);
2235 tomoyo_create_entry("meminfo", 0600, tomoyo_dir,
2237 tomoyo_create_entry("profile", 0600, tomoyo_dir,
2239 tomoyo_create_entry("manager", 0600, tomoyo_dir,
2241 tomoyo_create_entry("version", 0400, tomoyo_dir,
2246 fs_initcall(tomoyo_initerface_init);