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/slab.h>
14 #include <linux/security.h>
15 #include <linux/hardirq.h>
18 /* Lock for protecting policy. */
19 DEFINE_MUTEX(tomoyo_policy_lock);
21 /* Has loading policy done? */
22 bool tomoyo_policy_loaded;
24 /* String table for functionality that takes 4 modes. */
25 static const char *tomoyo_mode_4[4] = {
26 "disabled", "learning", "permissive", "enforcing"
28 /* String table for functionality that takes 2 modes. */
29 static const char *tomoyo_mode_2[4] = {
30 "disabled", "enabled", "enabled", "enabled"
34 * tomoyo_control_array is a static data which contains
36 * (1) functionality name used by /sys/kernel/security/tomoyo/profile .
37 * (2) initial values for "struct tomoyo_profile".
38 * (3) max values for "struct tomoyo_profile".
42 unsigned int current_value;
43 const unsigned int max_value;
44 } tomoyo_control_array[TOMOYO_MAX_CONTROL_INDEX] = {
45 [TOMOYO_MAC_FOR_FILE] = { "MAC_FOR_FILE", 0, 3 },
46 [TOMOYO_MAX_ACCEPT_ENTRY] = { "MAX_ACCEPT_ENTRY", 2048, INT_MAX },
47 [TOMOYO_VERBOSE] = { "TOMOYO_VERBOSE", 1, 1 },
51 * tomoyo_profile is a structure which is used for holding the mode of access
52 * controls. TOMOYO has 4 modes: disabled, learning, permissive, enforcing.
53 * An administrator can define up to 256 profiles.
54 * The ->profile of "struct tomoyo_domain_info" is used for remembering
55 * the profile's number (0 - 255) assigned to that domain.
57 static struct tomoyo_profile {
58 unsigned int value[TOMOYO_MAX_CONTROL_INDEX];
59 const struct tomoyo_path_info *comment;
60 } *tomoyo_profile_ptr[TOMOYO_MAX_PROFILES];
62 /* Permit policy management by non-root user? */
63 static bool tomoyo_manage_by_non_root;
65 /* Utility functions. */
67 /* Open operation for /sys/kernel/security/tomoyo/ interface. */
68 static int tomoyo_open_control(const u8 type, struct file *file);
69 /* Close /sys/kernel/security/tomoyo/ interface. */
70 static int tomoyo_close_control(struct file *file);
71 /* Read operation for /sys/kernel/security/tomoyo/ interface. */
72 static int tomoyo_read_control(struct file *file, char __user *buffer,
73 const int buffer_len);
74 /* Write operation for /sys/kernel/security/tomoyo/ interface. */
75 static int tomoyo_write_control(struct file *file, const char __user *buffer,
76 const int buffer_len);
79 * tomoyo_parse_name_union - Parse a tomoyo_name_union.
81 * @filename: Name or name group.
82 * @ptr: Pointer to "struct tomoyo_name_union".
84 * Returns true on success, false otherwise.
86 bool tomoyo_parse_name_union(const char *filename,
87 struct tomoyo_name_union *ptr)
89 if (!tomoyo_is_correct_path(filename, 0, 0, 0))
91 if (filename[0] == '@') {
92 ptr->group = tomoyo_get_path_group(filename + 1);
94 return ptr->group != NULL;
96 ptr->filename = tomoyo_get_name(filename);
97 ptr->is_group = false;
98 return ptr->filename != NULL;
102 * tomoyo_print_name_union - Print a tomoyo_name_union.
104 * @head: Pointer to "struct tomoyo_io_buffer".
105 * @ptr: Pointer to "struct tomoyo_name_union".
107 * Returns true on success, false otherwise.
109 static bool tomoyo_print_name_union(struct tomoyo_io_buffer *head,
110 const struct tomoyo_name_union *ptr)
112 int pos = head->read_avail;
113 if (pos && head->read_buf[pos - 1] == ' ')
116 return tomoyo_io_printf(head, " @%s",
117 ptr->group->group_name->name);
118 return tomoyo_io_printf(head, " %s", ptr->filename->name);
122 * tomoyo_parse_ulong - Parse an "unsigned long" value.
124 * @result: Pointer to "unsigned long".
125 * @str: Pointer to string to parse.
127 * Returns value type on success, 0 otherwise.
129 * The @src is updated to point the first character after the value
132 u8 tomoyo_parse_ulong(unsigned long *result, char **str)
134 const char *cp = *str;
139 if (c == 'x' || c == 'X') {
142 } else if (c >= '0' && c <= '7') {
147 *result = simple_strtoul(cp, &ep, base);
153 return TOMOYO_VALUE_TYPE_HEXADECIMAL;
155 return TOMOYO_VALUE_TYPE_OCTAL;
157 return TOMOYO_VALUE_TYPE_DECIMAL;
162 * tomoyo_print_ulong - Print an "unsigned long" value.
164 * @buffer: Pointer to buffer.
165 * @buffer_len: Size of @buffer.
166 * @value: An "unsigned long" value.
167 * @type: Type of @value.
171 void tomoyo_print_ulong(char *buffer, const int buffer_len,
172 const unsigned long value, const u8 type)
174 if (type == TOMOYO_VALUE_TYPE_DECIMAL)
175 snprintf(buffer, buffer_len, "%lu", value);
176 else if (type == TOMOYO_VALUE_TYPE_OCTAL)
177 snprintf(buffer, buffer_len, "0%lo", value);
178 else if (type == TOMOYO_VALUE_TYPE_HEXADECIMAL)
179 snprintf(buffer, buffer_len, "0x%lX", value);
181 snprintf(buffer, buffer_len, "type(%u)", type);
185 * tomoyo_print_number_union - Print a tomoyo_number_union.
187 * @head: Pointer to "struct tomoyo_io_buffer".
188 * @ptr: Pointer to "struct tomoyo_number_union".
190 * Returns true on success, false otherwise.
192 bool tomoyo_print_number_union(struct tomoyo_io_buffer *head,
193 const struct tomoyo_number_union *ptr)
199 if (!tomoyo_io_printf(head, " "))
202 return tomoyo_io_printf(head, "@%s",
203 ptr->group->group_name->name);
204 min_type = ptr->min_type;
205 max_type = ptr->max_type;
206 min = ptr->values[0];
207 max = ptr->values[1];
209 case TOMOYO_VALUE_TYPE_HEXADECIMAL:
210 if (!tomoyo_io_printf(head, "0x%lX", min))
213 case TOMOYO_VALUE_TYPE_OCTAL:
214 if (!tomoyo_io_printf(head, "0%lo", min))
218 if (!tomoyo_io_printf(head, "%lu", min))
222 if (min == max && min_type == max_type)
225 case TOMOYO_VALUE_TYPE_HEXADECIMAL:
226 return tomoyo_io_printf(head, "-0x%lX", max);
227 case TOMOYO_VALUE_TYPE_OCTAL:
228 return tomoyo_io_printf(head, "-0%lo", max);
230 return tomoyo_io_printf(head, "-%lu", max);
235 * tomoyo_parse_number_union - Parse a tomoyo_number_union.
237 * @data: Number or number range or number group.
238 * @ptr: Pointer to "struct tomoyo_number_union".
240 * Returns true on success, false otherwise.
242 bool tomoyo_parse_number_union(char *data, struct tomoyo_number_union *num)
246 memset(num, 0, sizeof(*num));
247 if (data[0] == '@') {
248 if (!tomoyo_is_correct_path(data, 0, 0, 0))
250 num->group = tomoyo_get_number_group(data + 1);
251 num->is_group = true;
252 return num->group != NULL;
254 type = tomoyo_parse_ulong(&v, &data);
258 num->min_type = type;
261 num->max_type = type;
266 type = tomoyo_parse_ulong(&v, &data);
270 num->max_type = type;
275 * tomoyo_is_byte_range - Check whether the string isa \ooo style octal value.
277 * @str: Pointer to the string.
279 * Returns true if @str is a \ooo style octal value, false otherwise.
281 * TOMOYO uses \ooo style representation for 0x01 - 0x20 and 0x7F - 0xFF.
282 * This function verifies that \ooo is in valid range.
284 static inline bool tomoyo_is_byte_range(const char *str)
286 return *str >= '0' && *str++ <= '3' &&
287 *str >= '0' && *str++ <= '7' &&
288 *str >= '0' && *str <= '7';
292 * tomoyo_is_alphabet_char - Check whether the character is an alphabet.
294 * @c: The character to check.
296 * Returns true if @c is an alphabet character, false otherwise.
298 static inline bool tomoyo_is_alphabet_char(const char c)
300 return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
304 * tomoyo_make_byte - Make byte value from three octal characters.
306 * @c1: The first character.
307 * @c2: The second character.
308 * @c3: The third character.
310 * Returns byte value.
312 static inline u8 tomoyo_make_byte(const u8 c1, const u8 c2, const u8 c3)
314 return ((c1 - '0') << 6) + ((c2 - '0') << 3) + (c3 - '0');
318 * tomoyo_str_starts - Check whether the given string starts with the given keyword.
320 * @src: Pointer to pointer to the string.
321 * @find: Pointer to the keyword.
323 * Returns true if @src starts with @find, false otherwise.
325 * The @src is updated to point the first character after the @find
326 * if @src starts with @find.
328 static bool tomoyo_str_starts(char **src, const char *find)
330 const int len = strlen(find);
333 if (strncmp(tmp, find, len))
341 * tomoyo_normalize_line - Format string.
343 * @buffer: The line to normalize.
345 * Leading and trailing whitespaces are removed.
346 * Multiple whitespaces are packed into single space.
350 static void tomoyo_normalize_line(unsigned char *buffer)
352 unsigned char *sp = buffer;
353 unsigned char *dp = buffer;
356 while (tomoyo_is_invalid(*sp))
362 while (tomoyo_is_valid(*sp))
364 while (tomoyo_is_invalid(*sp))
371 * tomoyo_tokenize - Tokenize string.
373 * @buffer: The line to tokenize.
374 * @w: Pointer to "char *".
377 * Returns true on success, false otherwise.
379 bool tomoyo_tokenize(char *buffer, char *w[], size_t size)
381 int count = size / sizeof(char *);
383 for (i = 0; i < count; i++)
385 for (i = 0; i < count; i++) {
386 char *cp = strchr(buffer, ' ');
394 return i < count || !*buffer;
398 * tomoyo_is_correct_path - Validate a pathname.
399 * @filename: The pathname to check.
400 * @start_type: Should the pathname start with '/'?
401 * 1 = must / -1 = must not / 0 = don't care
402 * @pattern_type: Can the pathname contain a wildcard?
403 * 1 = must / -1 = must not / 0 = don't care
404 * @end_type: Should the pathname end with '/'?
405 * 1 = must / -1 = must not / 0 = don't care
407 * Check whether the given filename follows the naming rules.
408 * Returns true if @filename follows the naming rules, false otherwise.
410 bool tomoyo_is_correct_path(const char *filename, const s8 start_type,
411 const s8 pattern_type, const s8 end_type)
413 const char *const start = filename;
414 bool in_repetition = false;
415 bool contains_pattern = false;
423 if (start_type == 1) { /* Must start with '/' */
426 } else if (start_type == -1) { /* Must not start with '/' */
431 c = *(filename + strlen(filename) - 1);
432 if (end_type == 1) { /* Must end with '/' */
435 } else if (end_type == -1) { /* Must not end with '/' */
446 case '\\': /* "\\" */
458 if (pattern_type == -1)
459 break; /* Must not contain pattern */
460 contains_pattern = true;
462 case '{': /* "/\{" */
463 if (filename - 3 < start ||
464 *(filename - 3) != '/')
466 if (pattern_type == -1)
467 break; /* Must not contain pattern */
468 contains_pattern = true;
469 in_repetition = true;
471 case '}': /* "\}/" */
472 if (*filename != '/')
476 in_repetition = false;
478 case '0': /* "\ooo" */
483 if (d < '0' || d > '7')
486 if (e < '0' || e > '7')
488 c = tomoyo_make_byte(c, d, e);
489 if (tomoyo_is_invalid(c))
490 continue; /* pattern is not \000 */
493 } else if (in_repetition && c == '/') {
495 } else if (tomoyo_is_invalid(c)) {
499 if (pattern_type == 1) { /* Must contain pattern */
500 if (!contains_pattern)
511 * tomoyo_is_correct_domain - Check whether the given domainname follows the naming rules.
512 * @domainname: The domainname to check.
514 * Returns true if @domainname follows the naming rules, false otherwise.
516 bool tomoyo_is_correct_domain(const unsigned char *domainname)
522 if (!domainname || strncmp(domainname, TOMOYO_ROOT_NAME,
523 TOMOYO_ROOT_NAME_LEN))
525 domainname += TOMOYO_ROOT_NAME_LEN;
529 if (*domainname++ != ' ')
531 if (*domainname++ != '/')
533 while ((c = *domainname) != '\0' && c != ' ') {
538 case '\\': /* "\\" */
540 case '0': /* "\ooo" */
545 if (d < '0' || d > '7')
548 if (e < '0' || e > '7')
550 c = tomoyo_make_byte(c, d, e);
551 if (tomoyo_is_invalid(c))
552 /* pattern is not \000 */
556 } else if (tomoyo_is_invalid(c)) {
560 } while (*domainname);
567 * tomoyo_is_domain_def - Check whether the given token can be a domainname.
569 * @buffer: The token to check.
571 * Returns true if @buffer possibly be a domainname, false otherwise.
573 bool tomoyo_is_domain_def(const unsigned char *buffer)
575 return !strncmp(buffer, TOMOYO_ROOT_NAME, TOMOYO_ROOT_NAME_LEN);
579 * tomoyo_find_domain - Find a domain by the given name.
581 * @domainname: The domainname to find.
583 * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
585 * Caller holds tomoyo_read_lock().
587 struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname)
589 struct tomoyo_domain_info *domain;
590 struct tomoyo_path_info name;
592 name.name = domainname;
593 tomoyo_fill_path_info(&name);
594 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
595 if (!domain->is_deleted &&
596 !tomoyo_pathcmp(&name, domain->domainname))
603 * tomoyo_const_part_length - Evaluate the initial length without a pattern in a token.
605 * @filename: The string to evaluate.
607 * Returns the initial length without a pattern in @filename.
609 static int tomoyo_const_part_length(const char *filename)
616 while ((c = *filename++) != '\0') {
623 case '\\': /* "\\" */
626 case '0': /* "\ooo" */
631 if (c < '0' || c > '7')
634 if (c < '0' || c > '7')
645 * tomoyo_fill_path_info - Fill in "struct tomoyo_path_info" members.
647 * @ptr: Pointer to "struct tomoyo_path_info" to fill in.
649 * The caller sets "struct tomoyo_path_info"->name.
651 void tomoyo_fill_path_info(struct tomoyo_path_info *ptr)
653 const char *name = ptr->name;
654 const int len = strlen(name);
656 ptr->const_len = tomoyo_const_part_length(name);
657 ptr->is_dir = len && (name[len - 1] == '/');
658 ptr->is_patterned = (ptr->const_len < len);
659 ptr->hash = full_name_hash(name, len);
663 * tomoyo_file_matches_pattern2 - Pattern matching without '/' character
666 * @filename: The start of string to check.
667 * @filename_end: The end of string to check.
668 * @pattern: The start of pattern to compare.
669 * @pattern_end: The end of pattern to compare.
671 * Returns true if @filename matches @pattern, false otherwise.
673 static bool tomoyo_file_matches_pattern2(const char *filename,
674 const char *filename_end,
676 const char *pattern_end)
678 while (filename < filename_end && pattern < pattern_end) {
680 if (*pattern != '\\') {
681 if (*filename++ != *pattern++)
693 } else if (c == '\\') {
694 if (filename[1] == '\\')
696 else if (tomoyo_is_byte_range(filename + 1))
705 if (*++filename != '\\')
717 if (!tomoyo_is_alphabet_char(c))
724 if (c == '\\' && tomoyo_is_byte_range(filename + 1)
725 && strncmp(filename + 1, pattern, 3) == 0) {
730 return false; /* Not matched. */
733 for (i = 0; i <= filename_end - filename; i++) {
734 if (tomoyo_file_matches_pattern2(
735 filename + i, filename_end,
736 pattern + 1, pattern_end))
739 if (c == '.' && *pattern == '@')
743 if (filename[i + 1] == '\\')
745 else if (tomoyo_is_byte_range(filename + i + 1))
748 break; /* Bad pattern. */
750 return false; /* Not matched. */
755 while (isdigit(filename[j]))
757 } else if (c == 'X') {
758 while (isxdigit(filename[j]))
760 } else if (c == 'A') {
761 while (tomoyo_is_alphabet_char(filename[j]))
764 for (i = 1; i <= j; i++) {
765 if (tomoyo_file_matches_pattern2(
766 filename + i, filename_end,
767 pattern + 1, pattern_end))
770 return false; /* Not matched or bad pattern. */
775 while (*pattern == '\\' &&
776 (*(pattern + 1) == '*' || *(pattern + 1) == '@'))
778 return filename == filename_end && pattern == pattern_end;
782 * tomoyo_file_matches_pattern - Pattern matching without without '/' character.
784 * @filename: The start of string to check.
785 * @filename_end: The end of string to check.
786 * @pattern: The start of pattern to compare.
787 * @pattern_end: The end of pattern to compare.
789 * Returns true if @filename matches @pattern, false otherwise.
791 static bool tomoyo_file_matches_pattern(const char *filename,
792 const char *filename_end,
794 const char *pattern_end)
796 const char *pattern_start = pattern;
800 while (pattern < pattern_end - 1) {
801 /* Split at "\-" pattern. */
802 if (*pattern++ != '\\' || *pattern++ != '-')
804 result = tomoyo_file_matches_pattern2(filename,
813 pattern_start = pattern;
815 result = tomoyo_file_matches_pattern2(filename, filename_end,
816 pattern_start, pattern_end);
817 return first ? result : !result;
821 * tomoyo_path_matches_pattern2 - Do pathname pattern matching.
823 * @f: The start of string to check.
824 * @p: The start of pattern to compare.
826 * Returns true if @f matches @p, false otherwise.
828 static bool tomoyo_path_matches_pattern2(const char *f, const char *p)
830 const char *f_delimiter;
831 const char *p_delimiter;
834 f_delimiter = strchr(f, '/');
836 f_delimiter = f + strlen(f);
837 p_delimiter = strchr(p, '/');
839 p_delimiter = p + strlen(p);
840 if (*p == '\\' && *(p + 1) == '{')
842 if (!tomoyo_file_matches_pattern(f, f_delimiter, p,
852 /* Ignore trailing "\*" and "\@" in @pattern. */
854 (*(p + 1) == '*' || *(p + 1) == '@'))
859 * The "\{" pattern is permitted only after '/' character.
860 * This guarantees that below "*(p - 1)" is safe.
861 * Also, the "\}" pattern is permitted only before '/' character
862 * so that "\{" + "\}" pair will not break the "\-" operator.
864 if (*(p - 1) != '/' || p_delimiter <= p + 3 || *p_delimiter != '/' ||
865 *(p_delimiter - 1) != '}' || *(p_delimiter - 2) != '\\')
866 return false; /* Bad pattern. */
868 /* Compare current component with pattern. */
869 if (!tomoyo_file_matches_pattern(f, f_delimiter, p + 2,
872 /* Proceed to next component. */
877 /* Continue comparison. */
878 if (tomoyo_path_matches_pattern2(f, p_delimiter + 1))
880 f_delimiter = strchr(f, '/');
881 } while (f_delimiter);
882 return false; /* Not matched. */
886 * tomoyo_path_matches_pattern - Check whether the given filename matches the given pattern.
888 * @filename: The filename to check.
889 * @pattern: The pattern to compare.
891 * Returns true if matches, false otherwise.
893 * The following patterns are available.
895 * \ooo Octal representation of a byte.
896 * \* Zero or more repetitions of characters other than '/'.
897 * \@ Zero or more repetitions of characters other than '/' or '.'.
898 * \? 1 byte character other than '/'.
899 * \$ One or more repetitions of decimal digits.
900 * \+ 1 decimal digit.
901 * \X One or more repetitions of hexadecimal digits.
902 * \x 1 hexadecimal digit.
903 * \A One or more repetitions of alphabet characters.
904 * \a 1 alphabet character.
906 * \- Subtraction operator.
908 * /\{dir\}/ '/' + 'One or more repetitions of dir/' (e.g. /dir/ /dir/dir/
911 bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
912 const struct tomoyo_path_info *pattern)
914 const char *f = filename->name;
915 const char *p = pattern->name;
916 const int len = pattern->const_len;
918 /* If @pattern doesn't contain pattern, I can use strcmp(). */
919 if (!pattern->is_patterned)
920 return !tomoyo_pathcmp(filename, pattern);
921 /* Don't compare directory and non-directory. */
922 if (filename->is_dir != pattern->is_dir)
924 /* Compare the initial length without patterns. */
925 if (strncmp(f, p, len))
929 return tomoyo_path_matches_pattern2(f, p);
933 * tomoyo_io_printf - Transactional printf() to "struct tomoyo_io_buffer" structure.
935 * @head: Pointer to "struct tomoyo_io_buffer".
936 * @fmt: The printf()'s format string, followed by parameters.
938 * Returns true if output was written, false otherwise.
940 * The snprintf() will truncate, but tomoyo_io_printf() won't.
942 bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
946 int pos = head->read_avail;
947 int size = head->readbuf_size - pos;
952 len = vsnprintf(head->read_buf + pos, size, fmt, args);
954 if (pos + len >= head->readbuf_size)
956 head->read_avail += len;
961 * tomoyo_get_exe - Get tomoyo_realpath() of current process.
963 * Returns the tomoyo_realpath() of current process on success, NULL otherwise.
965 * This function uses kzalloc(), so the caller must call kfree()
966 * if this function didn't return NULL.
968 static const char *tomoyo_get_exe(void)
970 struct mm_struct *mm = current->mm;
971 struct vm_area_struct *vma;
972 const char *cp = NULL;
976 down_read(&mm->mmap_sem);
977 for (vma = mm->mmap; vma; vma = vma->vm_next) {
978 if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file) {
979 cp = tomoyo_realpath_from_path(&vma->vm_file->f_path);
983 up_read(&mm->mmap_sem);
988 * tomoyo_check_flags - Check mode for specified functionality.
990 * @domain: Pointer to "struct tomoyo_domain_info".
991 * @index: The functionality to check mode.
993 * TOMOYO checks only process context.
994 * This code disables TOMOYO's enforcement in case the function is called from
997 unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain,
1000 const u8 profile = domain->profile;
1002 if (WARN_ON(in_interrupt()))
1004 return tomoyo_policy_loaded && index < TOMOYO_MAX_CONTROL_INDEX
1005 #if TOMOYO_MAX_PROFILES != 256
1006 && profile < TOMOYO_MAX_PROFILES
1008 && tomoyo_profile_ptr[profile] ?
1009 tomoyo_profile_ptr[profile]->value[index] : 0;
1013 * tomoyo_verbose_mode - Check whether TOMOYO is verbose mode.
1015 * @domain: Pointer to "struct tomoyo_domain_info".
1017 * Returns true if domain policy violation warning should be printed to
1020 bool tomoyo_verbose_mode(const struct tomoyo_domain_info *domain)
1022 return tomoyo_check_flags(domain, TOMOYO_VERBOSE) != 0;
1026 * tomoyo_domain_quota_is_ok - Check for domain's quota.
1028 * @r: Pointer to "struct tomoyo_request_info".
1030 * Returns true if the domain is not exceeded quota, false otherwise.
1032 * Caller holds tomoyo_read_lock().
1034 bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r)
1036 unsigned int count = 0;
1037 struct tomoyo_domain_info *domain = r->domain;
1038 struct tomoyo_acl_info *ptr;
1040 if (r->mode != TOMOYO_CONFIG_LEARNING)
1044 list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
1045 switch (ptr->type) {
1048 case TOMOYO_TYPE_PATH_ACL:
1049 perm = container_of(ptr, struct tomoyo_path_acl, head)
1051 for (i = 0; i < TOMOYO_MAX_PATH_OPERATION; i++)
1052 if (perm & (1 << i))
1054 if (perm & (1 << TOMOYO_TYPE_READ_WRITE))
1057 case TOMOYO_TYPE_PATH2_ACL:
1058 perm = container_of(ptr, struct tomoyo_path2_acl, head)
1060 for (i = 0; i < TOMOYO_MAX_PATH2_OPERATION; i++)
1061 if (perm & (1 << i))
1064 case TOMOYO_TYPE_PATH_NUMBER_ACL:
1065 perm = container_of(ptr, struct tomoyo_path_number_acl,
1067 for (i = 0; i < TOMOYO_MAX_PATH_NUMBER_OPERATION; i++)
1068 if (perm & (1 << i))
1071 case TOMOYO_TYPE_PATH_NUMBER3_ACL:
1072 perm = container_of(ptr, struct tomoyo_path_number3_acl,
1074 for (i = 0; i < TOMOYO_MAX_PATH_NUMBER3_OPERATION; i++)
1075 if (perm & (1 << i))
1080 if (count < tomoyo_check_flags(domain, TOMOYO_MAX_ACCEPT_ENTRY))
1082 if (!domain->quota_warned) {
1083 domain->quota_warned = true;
1084 printk(KERN_WARNING "TOMOYO-WARNING: "
1085 "Domain '%s' has so many ACLs to hold. "
1086 "Stopped learning mode.\n", domain->domainname->name);
1092 * tomoyo_find_or_assign_new_profile - Create a new profile.
1094 * @profile: Profile number to create.
1096 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
1098 static struct tomoyo_profile *tomoyo_find_or_assign_new_profile(const unsigned
1101 struct tomoyo_profile *ptr = NULL;
1104 if (profile >= TOMOYO_MAX_PROFILES)
1106 if (mutex_lock_interruptible(&tomoyo_policy_lock))
1108 ptr = tomoyo_profile_ptr[profile];
1111 ptr = kmalloc(sizeof(*ptr), GFP_NOFS);
1112 if (!tomoyo_memory_ok(ptr)) {
1117 for (i = 0; i < TOMOYO_MAX_CONTROL_INDEX; i++)
1118 ptr->value[i] = tomoyo_control_array[i].current_value;
1119 mb(); /* Avoid out-of-order execution. */
1120 tomoyo_profile_ptr[profile] = ptr;
1122 mutex_unlock(&tomoyo_policy_lock);
1127 * tomoyo_write_profile - Write to profile table.
1129 * @head: Pointer to "struct tomoyo_io_buffer".
1131 * Returns 0 on success, negative value otherwise.
1133 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
1135 char *data = head->write_buf;
1139 struct tomoyo_profile *profile;
1142 cp = strchr(data, '-');
1145 if (strict_strtoul(data, 10, &num))
1149 profile = tomoyo_find_or_assign_new_profile(num);
1152 cp = strchr(data, '=');
1156 if (!strcmp(data, "COMMENT")) {
1157 const struct tomoyo_path_info *old_comment = profile->comment;
1158 profile->comment = tomoyo_get_name(cp + 1);
1159 tomoyo_put_name(old_comment);
1162 for (i = 0; i < TOMOYO_MAX_CONTROL_INDEX; i++) {
1163 if (strcmp(data, tomoyo_control_array[i].keyword))
1165 if (sscanf(cp + 1, "%u", &value) != 1) {
1169 case TOMOYO_VERBOSE:
1170 modes = tomoyo_mode_2;
1173 modes = tomoyo_mode_4;
1176 for (j = 0; j < 4; j++) {
1177 if (strcmp(cp + 1, modes[j]))
1184 } else if (value > tomoyo_control_array[i].max_value) {
1185 value = tomoyo_control_array[i].max_value;
1187 profile->value[i] = value;
1194 * tomoyo_read_profile - Read from profile table.
1196 * @head: Pointer to "struct tomoyo_io_buffer".
1200 static int tomoyo_read_profile(struct tomoyo_io_buffer *head)
1202 static const int total = TOMOYO_MAX_CONTROL_INDEX + 1;
1207 for (step = head->read_step; step < TOMOYO_MAX_PROFILES * total;
1209 const u8 index = step / total;
1210 u8 type = step % total;
1211 const struct tomoyo_profile *profile
1212 = tomoyo_profile_ptr[index];
1213 head->read_step = step;
1216 if (!type) { /* Print profile' comment tag. */
1217 if (!tomoyo_io_printf(head, "%u-COMMENT=%s\n",
1218 index, profile->comment ?
1219 profile->comment->name : ""))
1224 if (type < TOMOYO_MAX_CONTROL_INDEX) {
1225 const unsigned int value = profile->value[type];
1226 const char **modes = NULL;
1228 = tomoyo_control_array[type].keyword;
1229 switch (tomoyo_control_array[type].max_value) {
1231 modes = tomoyo_mode_4;
1234 modes = tomoyo_mode_2;
1238 if (!tomoyo_io_printf(head, "%u-%s=%s\n", index,
1239 keyword, modes[value]))
1242 if (!tomoyo_io_printf(head, "%u-%s=%u\n", index,
1248 if (step == TOMOYO_MAX_PROFILES * total)
1249 head->read_eof = true;
1254 * tomoyo_policy_manager_list is used for holding list of domainnames or
1255 * programs which are permitted to modify configuration via
1256 * /sys/kernel/security/tomoyo/ interface.
1258 * An entry is added by
1260 * # echo '<kernel> /sbin/mingetty /bin/login /bin/bash' > \
1261 * /sys/kernel/security/tomoyo/manager
1262 * (if you want to specify by a domainname)
1266 * # echo '/usr/lib/ccs/editpolicy' > /sys/kernel/security/tomoyo/manager
1267 * (if you want to specify by a program's location)
1271 * # echo 'delete <kernel> /sbin/mingetty /bin/login /bin/bash' > \
1272 * /sys/kernel/security/tomoyo/manager
1276 * # echo 'delete /usr/lib/ccs/editpolicy' > \
1277 * /sys/kernel/security/tomoyo/manager
1279 * and all entries are retrieved by
1281 * # cat /sys/kernel/security/tomoyo/manager
1283 LIST_HEAD(tomoyo_policy_manager_list);
1286 * tomoyo_update_manager_entry - Add a manager entry.
1288 * @manager: The path to manager or the domainnamme.
1289 * @is_delete: True if it is a delete request.
1291 * Returns 0 on success, negative value otherwise.
1293 * Caller holds tomoyo_read_lock().
1295 static int tomoyo_update_manager_entry(const char *manager,
1296 const bool is_delete)
1298 struct tomoyo_policy_manager_entry *ptr;
1299 struct tomoyo_policy_manager_entry e = { };
1300 int error = is_delete ? -ENOENT : -ENOMEM;
1302 if (tomoyo_is_domain_def(manager)) {
1303 if (!tomoyo_is_correct_domain(manager))
1307 if (!tomoyo_is_correct_path(manager, 1, -1, -1))
1310 e.manager = tomoyo_get_name(manager);
1313 if (mutex_lock_interruptible(&tomoyo_policy_lock))
1315 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
1316 if (ptr->manager != e.manager)
1318 ptr->is_deleted = is_delete;
1322 if (!is_delete && error) {
1323 struct tomoyo_policy_manager_entry *entry =
1324 tomoyo_commit_ok(&e, sizeof(e));
1326 list_add_tail_rcu(&entry->list,
1327 &tomoyo_policy_manager_list);
1331 mutex_unlock(&tomoyo_policy_lock);
1333 tomoyo_put_name(e.manager);
1338 * tomoyo_write_manager_policy - Write manager policy.
1340 * @head: Pointer to "struct tomoyo_io_buffer".
1342 * Returns 0 on success, negative value otherwise.
1344 * Caller holds tomoyo_read_lock().
1346 static int tomoyo_write_manager_policy(struct tomoyo_io_buffer *head)
1348 char *data = head->write_buf;
1349 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
1351 if (!strcmp(data, "manage_by_non_root")) {
1352 tomoyo_manage_by_non_root = !is_delete;
1355 return tomoyo_update_manager_entry(data, is_delete);
1359 * tomoyo_read_manager_policy - Read manager policy.
1361 * @head: Pointer to "struct tomoyo_io_buffer".
1365 * Caller holds tomoyo_read_lock().
1367 static int tomoyo_read_manager_policy(struct tomoyo_io_buffer *head)
1369 struct list_head *pos;
1374 list_for_each_cookie(pos, head->read_var2,
1375 &tomoyo_policy_manager_list) {
1376 struct tomoyo_policy_manager_entry *ptr;
1377 ptr = list_entry(pos, struct tomoyo_policy_manager_entry,
1379 if (ptr->is_deleted)
1381 done = tomoyo_io_printf(head, "%s\n", ptr->manager->name);
1385 head->read_eof = done;
1390 * tomoyo_is_policy_manager - Check whether the current process is a policy manager.
1392 * Returns true if the current process is permitted to modify policy
1393 * via /sys/kernel/security/tomoyo/ interface.
1395 * Caller holds tomoyo_read_lock().
1397 static bool tomoyo_is_policy_manager(void)
1399 struct tomoyo_policy_manager_entry *ptr;
1401 const struct task_struct *task = current;
1402 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
1405 if (!tomoyo_policy_loaded)
1407 if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
1409 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
1410 if (!ptr->is_deleted && ptr->is_domain
1411 && !tomoyo_pathcmp(domainname, ptr->manager)) {
1418 exe = tomoyo_get_exe();
1421 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
1422 if (!ptr->is_deleted && !ptr->is_domain
1423 && !strcmp(exe, ptr->manager->name)) {
1428 if (!found) { /* Reduce error messages. */
1429 static pid_t last_pid;
1430 const pid_t pid = current->pid;
1431 if (last_pid != pid) {
1432 printk(KERN_WARNING "%s ( %s ) is not permitted to "
1433 "update policies.\n", domainname->name, exe);
1442 * tomoyo_is_select_one - Parse select command.
1444 * @head: Pointer to "struct tomoyo_io_buffer".
1445 * @data: String to parse.
1447 * Returns true on success, false otherwise.
1449 * Caller holds tomoyo_read_lock().
1451 static bool tomoyo_is_select_one(struct tomoyo_io_buffer *head,
1455 struct tomoyo_domain_info *domain = NULL;
1457 if (sscanf(data, "pid=%u", &pid) == 1) {
1458 struct task_struct *p;
1460 read_lock(&tasklist_lock);
1461 p = find_task_by_vpid(pid);
1463 domain = tomoyo_real_domain(p);
1464 read_unlock(&tasklist_lock);
1466 } else if (!strncmp(data, "domain=", 7)) {
1467 if (tomoyo_is_domain_def(data + 7))
1468 domain = tomoyo_find_domain(data + 7);
1471 head->write_var1 = domain;
1472 /* Accessing read_buf is safe because head->io_sem is held. */
1473 if (!head->read_buf)
1474 return true; /* Do nothing if open(O_WRONLY). */
1475 head->read_avail = 0;
1476 tomoyo_io_printf(head, "# select %s\n", data);
1477 head->read_single_domain = true;
1478 head->read_eof = !domain;
1480 struct tomoyo_domain_info *d;
1481 head->read_var1 = NULL;
1482 list_for_each_entry_rcu(d, &tomoyo_domain_list, list) {
1485 head->read_var1 = &d->list;
1487 head->read_var2 = NULL;
1489 head->read_step = 0;
1490 if (domain->is_deleted)
1491 tomoyo_io_printf(head, "# This is a deleted domain.\n");
1497 * tomoyo_delete_domain - Delete a domain.
1499 * @domainname: The name of domain.
1503 * Caller holds tomoyo_read_lock().
1505 static int tomoyo_delete_domain(char *domainname)
1507 struct tomoyo_domain_info *domain;
1508 struct tomoyo_path_info name;
1510 name.name = domainname;
1511 tomoyo_fill_path_info(&name);
1512 if (mutex_lock_interruptible(&tomoyo_policy_lock))
1514 /* Is there an active domain? */
1515 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1516 /* Never delete tomoyo_kernel_domain */
1517 if (domain == &tomoyo_kernel_domain)
1519 if (domain->is_deleted ||
1520 tomoyo_pathcmp(domain->domainname, &name))
1522 domain->is_deleted = true;
1525 mutex_unlock(&tomoyo_policy_lock);
1530 * tomoyo_write_domain_policy - Write domain policy.
1532 * @head: Pointer to "struct tomoyo_io_buffer".
1534 * Returns 0 on success, negative value otherwise.
1536 * Caller holds tomoyo_read_lock().
1538 static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head)
1540 char *data = head->write_buf;
1541 struct tomoyo_domain_info *domain = head->write_var1;
1542 bool is_delete = false;
1543 bool is_select = false;
1544 unsigned int profile;
1546 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE))
1548 else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT))
1550 if (is_select && tomoyo_is_select_one(head, data))
1552 /* Don't allow updating policies by non manager programs. */
1553 if (!tomoyo_is_policy_manager())
1555 if (tomoyo_is_domain_def(data)) {
1558 tomoyo_delete_domain(data);
1560 domain = tomoyo_find_domain(data);
1562 domain = tomoyo_find_or_assign_new_domain(data, 0);
1563 head->write_var1 = domain;
1569 if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1
1570 && profile < TOMOYO_MAX_PROFILES) {
1571 if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)
1572 domain->profile = (u8) profile;
1575 if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) {
1576 domain->ignore_global_allow_read = !is_delete;
1579 return tomoyo_write_file_policy(data, domain, is_delete);
1583 * tomoyo_print_path_acl - Print a single path ACL entry.
1585 * @head: Pointer to "struct tomoyo_io_buffer".
1586 * @ptr: Pointer to "struct tomoyo_path_acl".
1588 * Returns true on success, false otherwise.
1590 static bool tomoyo_print_path_acl(struct tomoyo_io_buffer *head,
1591 struct tomoyo_path_acl *ptr)
1595 const u16 perm = ptr->perm;
1597 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1598 if (!(perm & (1 << bit)))
1600 /* Print "read/write" instead of "read" and "write". */
1601 if ((bit == TOMOYO_TYPE_READ || bit == TOMOYO_TYPE_WRITE)
1602 && (perm & (1 << TOMOYO_TYPE_READ_WRITE)))
1604 pos = head->read_avail;
1605 if (!tomoyo_io_printf(head, "allow_%s ",
1606 tomoyo_path2keyword(bit)) ||
1607 !tomoyo_print_name_union(head, &ptr->name) ||
1608 !tomoyo_io_printf(head, "\n"))
1614 head->read_bit = bit;
1615 head->read_avail = pos;
1620 * tomoyo_print_path2_acl - Print a double path ACL entry.
1622 * @head: Pointer to "struct tomoyo_io_buffer".
1623 * @ptr: Pointer to "struct tomoyo_path2_acl".
1625 * Returns true on success, false otherwise.
1627 static bool tomoyo_print_path2_acl(struct tomoyo_io_buffer *head,
1628 struct tomoyo_path2_acl *ptr)
1631 const u8 perm = ptr->perm;
1634 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1635 if (!(perm & (1 << bit)))
1637 pos = head->read_avail;
1638 if (!tomoyo_io_printf(head, "allow_%s ",
1639 tomoyo_path22keyword(bit)) ||
1640 !tomoyo_print_name_union(head, &ptr->name1) ||
1641 !tomoyo_print_name_union(head, &ptr->name2) ||
1642 !tomoyo_io_printf(head, "\n"))
1648 head->read_bit = bit;
1649 head->read_avail = pos;
1654 * tomoyo_print_path_number_acl - Print a path_number ACL entry.
1656 * @head: Pointer to "struct tomoyo_io_buffer".
1657 * @ptr: Pointer to "struct tomoyo_path_number_acl".
1659 * Returns true on success, false otherwise.
1661 static bool tomoyo_print_path_number_acl(struct tomoyo_io_buffer *head,
1662 struct tomoyo_path_number_acl *ptr)
1666 const u8 perm = ptr->perm;
1667 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION;
1669 if (!(perm & (1 << bit)))
1671 pos = head->read_avail;
1672 if (!tomoyo_io_printf(head, "allow_%s",
1673 tomoyo_path_number2keyword(bit)) ||
1674 !tomoyo_print_name_union(head, &ptr->name) ||
1675 !tomoyo_print_number_union(head, &ptr->number) ||
1676 !tomoyo_io_printf(head, "\n"))
1682 head->read_bit = bit;
1683 head->read_avail = pos;
1688 * tomoyo_print_path_number3_acl - Print a path_number3 ACL entry.
1690 * @head: Pointer to "struct tomoyo_io_buffer".
1691 * @ptr: Pointer to "struct tomoyo_path_number3_acl".
1693 * Returns true on success, false otherwise.
1695 static bool tomoyo_print_path_number3_acl(struct tomoyo_io_buffer *head,
1696 struct tomoyo_path_number3_acl *ptr)
1700 const u16 perm = ptr->perm;
1701 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER3_OPERATION;
1703 if (!(perm & (1 << bit)))
1705 pos = head->read_avail;
1706 if (!tomoyo_io_printf(head, "allow_%s",
1707 tomoyo_path_number32keyword(bit)) ||
1708 !tomoyo_print_name_union(head, &ptr->name) ||
1709 !tomoyo_print_number_union(head, &ptr->mode) ||
1710 !tomoyo_print_number_union(head, &ptr->major) ||
1711 !tomoyo_print_number_union(head, &ptr->minor) ||
1712 !tomoyo_io_printf(head, "\n"))
1718 head->read_bit = bit;
1719 head->read_avail = pos;
1724 * tomoyo_print_entry - Print an ACL entry.
1726 * @head: Pointer to "struct tomoyo_io_buffer".
1727 * @ptr: Pointer to an ACL entry.
1729 * Returns true on success, false otherwise.
1731 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1732 struct tomoyo_acl_info *ptr)
1734 const u8 acl_type = ptr->type;
1736 if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1737 struct tomoyo_path_acl *acl
1738 = container_of(ptr, struct tomoyo_path_acl, head);
1739 return tomoyo_print_path_acl(head, acl);
1741 if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1742 struct tomoyo_path2_acl *acl
1743 = container_of(ptr, struct tomoyo_path2_acl, head);
1744 return tomoyo_print_path2_acl(head, acl);
1746 if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1747 struct tomoyo_path_number_acl *acl
1748 = container_of(ptr, struct tomoyo_path_number_acl,
1750 return tomoyo_print_path_number_acl(head, acl);
1752 if (acl_type == TOMOYO_TYPE_PATH_NUMBER3_ACL) {
1753 struct tomoyo_path_number3_acl *acl
1754 = container_of(ptr, struct tomoyo_path_number3_acl,
1756 return tomoyo_print_path_number3_acl(head, acl);
1758 BUG(); /* This must not happen. */
1763 * tomoyo_read_domain_policy - Read domain policy.
1765 * @head: Pointer to "struct tomoyo_io_buffer".
1769 * Caller holds tomoyo_read_lock().
1771 static int tomoyo_read_domain_policy(struct tomoyo_io_buffer *head)
1773 struct list_head *dpos;
1774 struct list_head *apos;
1779 if (head->read_step == 0)
1780 head->read_step = 1;
1781 list_for_each_cookie(dpos, head->read_var1, &tomoyo_domain_list) {
1782 struct tomoyo_domain_info *domain;
1783 const char *quota_exceeded = "";
1784 const char *transition_failed = "";
1785 const char *ignore_global_allow_read = "";
1786 domain = list_entry(dpos, struct tomoyo_domain_info, list);
1787 if (head->read_step != 1)
1789 if (domain->is_deleted && !head->read_single_domain)
1791 /* Print domainname and flags. */
1792 if (domain->quota_warned)
1793 quota_exceeded = "quota_exceeded\n";
1794 if (domain->transition_failed)
1795 transition_failed = "transition_failed\n";
1796 if (domain->ignore_global_allow_read)
1797 ignore_global_allow_read
1798 = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n";
1799 done = tomoyo_io_printf(head, "%s\n" TOMOYO_KEYWORD_USE_PROFILE
1801 domain->domainname->name,
1802 domain->profile, quota_exceeded,
1804 ignore_global_allow_read);
1807 head->read_step = 2;
1809 if (head->read_step == 3)
1811 /* Print ACL entries in the domain. */
1812 list_for_each_cookie(apos, head->read_var2,
1813 &domain->acl_info_list) {
1814 struct tomoyo_acl_info *ptr
1815 = list_entry(apos, struct tomoyo_acl_info,
1817 done = tomoyo_print_entry(head, ptr);
1823 head->read_step = 3;
1825 done = tomoyo_io_printf(head, "\n");
1828 head->read_step = 1;
1829 if (head->read_single_domain)
1832 head->read_eof = done;
1837 * tomoyo_write_domain_profile - Assign profile for specified domain.
1839 * @head: Pointer to "struct tomoyo_io_buffer".
1841 * Returns 0 on success, -EINVAL otherwise.
1843 * This is equivalent to doing
1845 * ( echo "select " $domainname; echo "use_profile " $profile ) |
1846 * /usr/lib/ccs/loadpolicy -d
1848 * Caller holds tomoyo_read_lock().
1850 static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head)
1852 char *data = head->write_buf;
1853 char *cp = strchr(data, ' ');
1854 struct tomoyo_domain_info *domain;
1855 unsigned long profile;
1860 domain = tomoyo_find_domain(cp + 1);
1861 if (strict_strtoul(data, 10, &profile))
1863 if (domain && profile < TOMOYO_MAX_PROFILES
1864 && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded))
1865 domain->profile = (u8) profile;
1870 * tomoyo_read_domain_profile - Read only domainname and profile.
1872 * @head: Pointer to "struct tomoyo_io_buffer".
1874 * Returns list of profile number and domainname pairs.
1876 * This is equivalent to doing
1878 * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
1879 * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" )
1880 * domainname = $0; } else if ( $1 == "use_profile" ) {
1881 * print $2 " " domainname; domainname = ""; } } ; '
1883 * Caller holds tomoyo_read_lock().
1885 static int tomoyo_read_domain_profile(struct tomoyo_io_buffer *head)
1887 struct list_head *pos;
1892 list_for_each_cookie(pos, head->read_var1, &tomoyo_domain_list) {
1893 struct tomoyo_domain_info *domain;
1894 domain = list_entry(pos, struct tomoyo_domain_info, list);
1895 if (domain->is_deleted)
1897 done = tomoyo_io_printf(head, "%u %s\n", domain->profile,
1898 domain->domainname->name);
1902 head->read_eof = done;
1907 * tomoyo_write_pid: Specify PID to obtain domainname.
1909 * @head: Pointer to "struct tomoyo_io_buffer".
1913 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1916 /* No error check. */
1917 strict_strtoul(head->write_buf, 10, &pid);
1918 head->read_step = (int) pid;
1919 head->read_eof = false;
1924 * tomoyo_read_pid - Get domainname of the specified PID.
1926 * @head: Pointer to "struct tomoyo_io_buffer".
1928 * Returns the domainname which the specified PID is in on success,
1929 * empty string otherwise.
1930 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1931 * using read()/write() interface rather than sysctl() interface.
1933 static int tomoyo_read_pid(struct tomoyo_io_buffer *head)
1935 if (head->read_avail == 0 && !head->read_eof) {
1936 const int pid = head->read_step;
1937 struct task_struct *p;
1938 struct tomoyo_domain_info *domain = NULL;
1940 read_lock(&tasklist_lock);
1941 p = find_task_by_vpid(pid);
1943 domain = tomoyo_real_domain(p);
1944 read_unlock(&tasklist_lock);
1947 tomoyo_io_printf(head, "%d %u %s", pid, domain->profile,
1948 domain->domainname->name);
1949 head->read_eof = true;
1955 * tomoyo_write_exception_policy - Write exception policy.
1957 * @head: Pointer to "struct tomoyo_io_buffer".
1959 * Returns 0 on success, negative value otherwise.
1961 * Caller holds tomoyo_read_lock().
1963 static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head)
1965 char *data = head->write_buf;
1966 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
1968 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_KEEP_DOMAIN))
1969 return tomoyo_write_domain_keeper_policy(data, false,
1971 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_KEEP_DOMAIN))
1972 return tomoyo_write_domain_keeper_policy(data, true, is_delete);
1973 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_INITIALIZE_DOMAIN))
1974 return tomoyo_write_domain_initializer_policy(data, false,
1976 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN))
1977 return tomoyo_write_domain_initializer_policy(data, true,
1979 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALIAS))
1980 return tomoyo_write_alias_policy(data, is_delete);
1981 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ))
1982 return tomoyo_write_globally_readable_policy(data, is_delete);
1983 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN))
1984 return tomoyo_write_pattern_policy(data, is_delete);
1985 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE))
1986 return tomoyo_write_no_rewrite_policy(data, is_delete);
1987 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_PATH_GROUP))
1988 return tomoyo_write_path_group_policy(data, is_delete);
1989 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NUMBER_GROUP))
1990 return tomoyo_write_number_group_policy(data, is_delete);
1995 * tomoyo_read_exception_policy - Read exception policy.
1997 * @head: Pointer to "struct tomoyo_io_buffer".
1999 * Returns 0 on success, -EINVAL otherwise.
2001 * Caller holds tomoyo_read_lock().
2003 static int tomoyo_read_exception_policy(struct tomoyo_io_buffer *head)
2005 if (!head->read_eof) {
2006 switch (head->read_step) {
2008 head->read_var2 = NULL;
2009 head->read_step = 1;
2011 if (!tomoyo_read_domain_keeper_policy(head))
2013 head->read_var2 = NULL;
2014 head->read_step = 2;
2016 if (!tomoyo_read_globally_readable_policy(head))
2018 head->read_var2 = NULL;
2019 head->read_step = 3;
2021 head->read_var2 = NULL;
2022 head->read_step = 4;
2024 if (!tomoyo_read_domain_initializer_policy(head))
2026 head->read_var2 = NULL;
2027 head->read_step = 5;
2029 if (!tomoyo_read_alias_policy(head))
2031 head->read_var2 = NULL;
2032 head->read_step = 6;
2034 head->read_var2 = NULL;
2035 head->read_step = 7;
2037 if (!tomoyo_read_file_pattern(head))
2039 head->read_var2 = NULL;
2040 head->read_step = 8;
2042 if (!tomoyo_read_no_rewrite_policy(head))
2044 head->read_var2 = NULL;
2045 head->read_step = 9;
2047 if (!tomoyo_read_path_group_policy(head))
2049 head->read_var1 = NULL;
2050 head->read_var2 = NULL;
2051 head->read_step = 10;
2053 if (!tomoyo_read_number_group_policy(head))
2055 head->read_var1 = NULL;
2056 head->read_var2 = NULL;
2057 head->read_step = 11;
2059 head->read_eof = true;
2068 /* path to policy loader */
2069 static const char *tomoyo_loader = "/sbin/tomoyo-init";
2072 * tomoyo_policy_loader_exists - Check whether /sbin/tomoyo-init exists.
2074 * Returns true if /sbin/tomoyo-init exists, false otherwise.
2076 static bool tomoyo_policy_loader_exists(void)
2079 * Don't activate MAC if the policy loader doesn't exist.
2080 * If the initrd includes /sbin/init but real-root-dev has not
2081 * mounted on / yet, activating MAC will block the system since
2082 * policies are not loaded yet.
2083 * Thus, let do_execve() call this function everytime.
2087 if (kern_path(tomoyo_loader, LOOKUP_FOLLOW, &path)) {
2088 printk(KERN_INFO "Not activating Mandatory Access Control now "
2089 "since %s doesn't exist.\n", tomoyo_loader);
2097 * tomoyo_load_policy - Run external policy loader to load policy.
2099 * @filename: The program about to start.
2101 * This function checks whether @filename is /sbin/init , and if so
2102 * invoke /sbin/tomoyo-init and wait for the termination of /sbin/tomoyo-init
2103 * and then continues invocation of /sbin/init.
2104 * /sbin/tomoyo-init reads policy files in /etc/tomoyo/ directory and
2105 * writes to /sys/kernel/security/tomoyo/ interfaces.
2109 void tomoyo_load_policy(const char *filename)
2114 if (tomoyo_policy_loaded)
2117 * Check filename is /sbin/init or /sbin/tomoyo-start.
2118 * /sbin/tomoyo-start is a dummy filename in case where /sbin/init can't
2120 * You can create /sbin/tomoyo-start by
2121 * "ln -s /bin/true /sbin/tomoyo-start".
2123 if (strcmp(filename, "/sbin/init") &&
2124 strcmp(filename, "/sbin/tomoyo-start"))
2126 if (!tomoyo_policy_loader_exists())
2129 printk(KERN_INFO "Calling %s to load policy. Please wait.\n",
2131 argv[0] = (char *) tomoyo_loader;
2134 envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
2136 call_usermodehelper(argv[0], argv, envp, 1);
2138 printk(KERN_INFO "TOMOYO: 2.2.0 2009/04/01\n");
2139 printk(KERN_INFO "Mandatory Access Control activated.\n");
2140 tomoyo_policy_loaded = true;
2141 { /* Check all profiles currently assigned to domains are defined. */
2142 struct tomoyo_domain_info *domain;
2143 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2144 const u8 profile = domain->profile;
2145 if (tomoyo_profile_ptr[profile])
2147 panic("Profile %u (used by '%s') not defined.\n",
2148 profile, domain->domainname->name);
2154 * tomoyo_read_version: Get version.
2156 * @head: Pointer to "struct tomoyo_io_buffer".
2158 * Returns version information.
2160 static int tomoyo_read_version(struct tomoyo_io_buffer *head)
2162 if (!head->read_eof) {
2163 tomoyo_io_printf(head, "2.2.0");
2164 head->read_eof = true;
2170 * tomoyo_read_self_domain - Get the current process's domainname.
2172 * @head: Pointer to "struct tomoyo_io_buffer".
2174 * Returns the current process's domainname.
2176 static int tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
2178 if (!head->read_eof) {
2180 * tomoyo_domain()->domainname != NULL
2181 * because every process belongs to a domain and
2182 * the domain's name cannot be NULL.
2184 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
2185 head->read_eof = true;
2191 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2193 * @type: Type of interface.
2194 * @file: Pointer to "struct file".
2196 * Associates policy handler and returns 0 on success, -ENOMEM otherwise.
2198 * Caller acquires tomoyo_read_lock().
2200 static int tomoyo_open_control(const u8 type, struct file *file)
2202 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2206 mutex_init(&head->io_sem);
2208 case TOMOYO_DOMAINPOLICY:
2209 /* /sys/kernel/security/tomoyo/domain_policy */
2210 head->write = tomoyo_write_domain_policy;
2211 head->read = tomoyo_read_domain_policy;
2213 case TOMOYO_EXCEPTIONPOLICY:
2214 /* /sys/kernel/security/tomoyo/exception_policy */
2215 head->write = tomoyo_write_exception_policy;
2216 head->read = tomoyo_read_exception_policy;
2218 case TOMOYO_SELFDOMAIN:
2219 /* /sys/kernel/security/tomoyo/self_domain */
2220 head->read = tomoyo_read_self_domain;
2222 case TOMOYO_DOMAIN_STATUS:
2223 /* /sys/kernel/security/tomoyo/.domain_status */
2224 head->write = tomoyo_write_domain_profile;
2225 head->read = tomoyo_read_domain_profile;
2227 case TOMOYO_PROCESS_STATUS:
2228 /* /sys/kernel/security/tomoyo/.process_status */
2229 head->write = tomoyo_write_pid;
2230 head->read = tomoyo_read_pid;
2232 case TOMOYO_VERSION:
2233 /* /sys/kernel/security/tomoyo/version */
2234 head->read = tomoyo_read_version;
2235 head->readbuf_size = 128;
2237 case TOMOYO_MEMINFO:
2238 /* /sys/kernel/security/tomoyo/meminfo */
2239 head->write = tomoyo_write_memory_quota;
2240 head->read = tomoyo_read_memory_counter;
2241 head->readbuf_size = 512;
2243 case TOMOYO_PROFILE:
2244 /* /sys/kernel/security/tomoyo/profile */
2245 head->write = tomoyo_write_profile;
2246 head->read = tomoyo_read_profile;
2248 case TOMOYO_MANAGER:
2249 /* /sys/kernel/security/tomoyo/manager */
2250 head->write = tomoyo_write_manager_policy;
2251 head->read = tomoyo_read_manager_policy;
2254 if (!(file->f_mode & FMODE_READ)) {
2256 * No need to allocate read_buf since it is not opened
2261 if (!head->readbuf_size)
2262 head->readbuf_size = 4096 * 2;
2263 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2264 if (!head->read_buf) {
2269 if (!(file->f_mode & FMODE_WRITE)) {
2271 * No need to allocate write_buf since it is not opened
2275 } else if (head->write) {
2276 head->writebuf_size = 4096 * 2;
2277 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2278 if (!head->write_buf) {
2279 kfree(head->read_buf);
2284 head->reader_idx = tomoyo_read_lock();
2285 file->private_data = head;
2287 * Call the handler now if the file is
2288 * /sys/kernel/security/tomoyo/self_domain
2289 * so that the user can use
2290 * cat < /sys/kernel/security/tomoyo/self_domain"
2291 * to know the current process's domainname.
2293 if (type == TOMOYO_SELFDOMAIN)
2294 tomoyo_read_control(file, NULL, 0);
2299 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2301 * @file: Pointer to "struct file".
2302 * @buffer: Poiner to buffer to write to.
2303 * @buffer_len: Size of @buffer.
2305 * Returns bytes read on success, negative value otherwise.
2307 * Caller holds tomoyo_read_lock().
2309 static int tomoyo_read_control(struct file *file, char __user *buffer,
2310 const int buffer_len)
2313 struct tomoyo_io_buffer *head = file->private_data;
2318 if (mutex_lock_interruptible(&head->io_sem))
2320 /* Call the policy handler. */
2321 len = head->read(head);
2324 /* Write to buffer. */
2325 len = head->read_avail;
2326 if (len > buffer_len)
2330 /* head->read_buf changes by some functions. */
2331 cp = head->read_buf;
2332 if (copy_to_user(buffer, cp, len)) {
2336 head->read_avail -= len;
2337 memmove(cp, cp + len, head->read_avail);
2339 mutex_unlock(&head->io_sem);
2344 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2346 * @file: Pointer to "struct file".
2347 * @buffer: Pointer to buffer to read from.
2348 * @buffer_len: Size of @buffer.
2350 * Returns @buffer_len on success, negative value otherwise.
2352 * Caller holds tomoyo_read_lock().
2354 static int tomoyo_write_control(struct file *file, const char __user *buffer,
2355 const int buffer_len)
2357 struct tomoyo_io_buffer *head = file->private_data;
2358 int error = buffer_len;
2359 int avail_len = buffer_len;
2360 char *cp0 = head->write_buf;
2364 if (!access_ok(VERIFY_READ, buffer, buffer_len))
2366 /* Don't allow updating policies by non manager programs. */
2367 if (head->write != tomoyo_write_pid &&
2368 head->write != tomoyo_write_domain_policy &&
2369 !tomoyo_is_policy_manager())
2371 if (mutex_lock_interruptible(&head->io_sem))
2373 /* Read a line and dispatch it to the policy handler. */
2374 while (avail_len > 0) {
2376 if (head->write_avail >= head->writebuf_size - 1) {
2379 } else if (get_user(c, buffer)) {
2385 cp0[head->write_avail++] = c;
2388 cp0[head->write_avail - 1] = '\0';
2389 head->write_avail = 0;
2390 tomoyo_normalize_line(cp0);
2393 mutex_unlock(&head->io_sem);
2398 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2400 * @file: Pointer to "struct file".
2402 * Releases memory and returns 0.
2404 * Caller looses tomoyo_read_lock().
2406 static int tomoyo_close_control(struct file *file)
2408 struct tomoyo_io_buffer *head = file->private_data;
2409 const bool is_write = !!head->write_buf;
2411 tomoyo_read_unlock(head->reader_idx);
2412 /* Release memory used for policy I/O. */
2413 kfree(head->read_buf);
2414 head->read_buf = NULL;
2415 kfree(head->write_buf);
2416 head->write_buf = NULL;
2419 file->private_data = NULL;
2426 * tomoyo_open - open() for /sys/kernel/security/tomoyo/ interface.
2428 * @inode: Pointer to "struct inode".
2429 * @file: Pointer to "struct file".
2431 * Returns 0 on success, negative value otherwise.
2433 static int tomoyo_open(struct inode *inode, struct file *file)
2435 const int key = ((u8 *) file->f_path.dentry->d_inode->i_private)
2437 return tomoyo_open_control(key, file);
2441 * tomoyo_release - close() for /sys/kernel/security/tomoyo/ interface.
2443 * @inode: Pointer to "struct inode".
2444 * @file: Pointer to "struct file".
2446 * Returns 0 on success, negative value otherwise.
2448 static int tomoyo_release(struct inode *inode, struct file *file)
2450 return tomoyo_close_control(file);
2454 * tomoyo_read - read() for /sys/kernel/security/tomoyo/ interface.
2456 * @file: Pointer to "struct file".
2457 * @buf: Pointer to buffer.
2458 * @count: Size of @buf.
2461 * Returns bytes read on success, negative value otherwise.
2463 static ssize_t tomoyo_read(struct file *file, char __user *buf, size_t count,
2466 return tomoyo_read_control(file, buf, count);
2470 * tomoyo_write - write() for /sys/kernel/security/tomoyo/ interface.
2472 * @file: Pointer to "struct file".
2473 * @buf: Pointer to buffer.
2474 * @count: Size of @buf.
2477 * Returns @count on success, negative value otherwise.
2479 static ssize_t tomoyo_write(struct file *file, const char __user *buf,
2480 size_t count, loff_t *ppos)
2482 return tomoyo_write_control(file, buf, count);
2486 * tomoyo_operations is a "struct file_operations" which is used for handling
2487 * /sys/kernel/security/tomoyo/ interface.
2489 * Some files under /sys/kernel/security/tomoyo/ directory accept open(O_RDWR).
2490 * See tomoyo_io_buffer for internals.
2492 static const struct file_operations tomoyo_operations = {
2493 .open = tomoyo_open,
2494 .release = tomoyo_release,
2495 .read = tomoyo_read,
2496 .write = tomoyo_write,
2500 * tomoyo_create_entry - Create interface files under /sys/kernel/security/tomoyo/ directory.
2502 * @name: The name of the interface file.
2503 * @mode: The permission of the interface file.
2504 * @parent: The parent directory.
2505 * @key: Type of interface.
2509 static void __init tomoyo_create_entry(const char *name, const mode_t mode,
2510 struct dentry *parent, const u8 key)
2512 securityfs_create_file(name, mode, parent, ((u8 *) NULL) + key,
2513 &tomoyo_operations);
2517 * tomoyo_initerface_init - Initialize /sys/kernel/security/tomoyo/ interface.
2521 static int __init tomoyo_initerface_init(void)
2523 struct dentry *tomoyo_dir;
2525 /* Don't create securityfs entries unless registered. */
2526 if (current_cred()->security != &tomoyo_kernel_domain)
2529 tomoyo_dir = securityfs_create_dir("tomoyo", NULL);
2530 tomoyo_create_entry("domain_policy", 0600, tomoyo_dir,
2531 TOMOYO_DOMAINPOLICY);
2532 tomoyo_create_entry("exception_policy", 0600, tomoyo_dir,
2533 TOMOYO_EXCEPTIONPOLICY);
2534 tomoyo_create_entry("self_domain", 0400, tomoyo_dir,
2536 tomoyo_create_entry(".domain_status", 0600, tomoyo_dir,
2537 TOMOYO_DOMAIN_STATUS);
2538 tomoyo_create_entry(".process_status", 0600, tomoyo_dir,
2539 TOMOYO_PROCESS_STATUS);
2540 tomoyo_create_entry("meminfo", 0600, tomoyo_dir,
2542 tomoyo_create_entry("profile", 0600, tomoyo_dir,
2544 tomoyo_create_entry("manager", 0600, tomoyo_dir,
2546 tomoyo_create_entry("version", 0400, tomoyo_dir,
2551 fs_initcall(tomoyo_initerface_init);