diff options
Diffstat (limited to 'security/tomoyo/util.c')
-rw-r--r-- | security/tomoyo/util.c | 1106 |
1 files changed, 1106 insertions, 0 deletions
diff --git a/security/tomoyo/util.c b/security/tomoyo/util.c new file mode 100644 index 000000000..6799b1122 --- /dev/null +++ b/security/tomoyo/util.c @@ -0,0 +1,1106 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * security/tomoyo/util.c + * + * Copyright (C) 2005-2011 NTT DATA CORPORATION + */ + +#include <linux/slab.h> +#include <linux/rculist.h> + +#include "common.h" + +/* Lock for protecting policy. */ +DEFINE_MUTEX(tomoyo_policy_lock); + +/* Has /sbin/init started? */ +bool tomoyo_policy_loaded; + +/* + * Mapping table from "enum tomoyo_mac_index" to + * "enum tomoyo_mac_category_index". + */ +const u8 tomoyo_index2category[TOMOYO_MAX_MAC_INDEX] = { + /* CONFIG::file group */ + [TOMOYO_MAC_FILE_EXECUTE] = TOMOYO_MAC_CATEGORY_FILE, + [TOMOYO_MAC_FILE_OPEN] = TOMOYO_MAC_CATEGORY_FILE, + [TOMOYO_MAC_FILE_CREATE] = TOMOYO_MAC_CATEGORY_FILE, + [TOMOYO_MAC_FILE_UNLINK] = TOMOYO_MAC_CATEGORY_FILE, + [TOMOYO_MAC_FILE_GETATTR] = TOMOYO_MAC_CATEGORY_FILE, + [TOMOYO_MAC_FILE_MKDIR] = TOMOYO_MAC_CATEGORY_FILE, + [TOMOYO_MAC_FILE_RMDIR] = TOMOYO_MAC_CATEGORY_FILE, + [TOMOYO_MAC_FILE_MKFIFO] = TOMOYO_MAC_CATEGORY_FILE, + [TOMOYO_MAC_FILE_MKSOCK] = TOMOYO_MAC_CATEGORY_FILE, + [TOMOYO_MAC_FILE_TRUNCATE] = TOMOYO_MAC_CATEGORY_FILE, + [TOMOYO_MAC_FILE_SYMLINK] = TOMOYO_MAC_CATEGORY_FILE, + [TOMOYO_MAC_FILE_MKBLOCK] = TOMOYO_MAC_CATEGORY_FILE, + [TOMOYO_MAC_FILE_MKCHAR] = TOMOYO_MAC_CATEGORY_FILE, + [TOMOYO_MAC_FILE_LINK] = TOMOYO_MAC_CATEGORY_FILE, + [TOMOYO_MAC_FILE_RENAME] = TOMOYO_MAC_CATEGORY_FILE, + [TOMOYO_MAC_FILE_CHMOD] = TOMOYO_MAC_CATEGORY_FILE, + [TOMOYO_MAC_FILE_CHOWN] = TOMOYO_MAC_CATEGORY_FILE, + [TOMOYO_MAC_FILE_CHGRP] = TOMOYO_MAC_CATEGORY_FILE, + [TOMOYO_MAC_FILE_IOCTL] = TOMOYO_MAC_CATEGORY_FILE, + [TOMOYO_MAC_FILE_CHROOT] = TOMOYO_MAC_CATEGORY_FILE, + [TOMOYO_MAC_FILE_MOUNT] = TOMOYO_MAC_CATEGORY_FILE, + [TOMOYO_MAC_FILE_UMOUNT] = TOMOYO_MAC_CATEGORY_FILE, + [TOMOYO_MAC_FILE_PIVOT_ROOT] = TOMOYO_MAC_CATEGORY_FILE, + /* CONFIG::network group */ + [TOMOYO_MAC_NETWORK_INET_STREAM_BIND] = + TOMOYO_MAC_CATEGORY_NETWORK, + [TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN] = + TOMOYO_MAC_CATEGORY_NETWORK, + [TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT] = + TOMOYO_MAC_CATEGORY_NETWORK, + [TOMOYO_MAC_NETWORK_INET_DGRAM_BIND] = + TOMOYO_MAC_CATEGORY_NETWORK, + [TOMOYO_MAC_NETWORK_INET_DGRAM_SEND] = + TOMOYO_MAC_CATEGORY_NETWORK, + [TOMOYO_MAC_NETWORK_INET_RAW_BIND] = + TOMOYO_MAC_CATEGORY_NETWORK, + [TOMOYO_MAC_NETWORK_INET_RAW_SEND] = + TOMOYO_MAC_CATEGORY_NETWORK, + [TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND] = + TOMOYO_MAC_CATEGORY_NETWORK, + [TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN] = + TOMOYO_MAC_CATEGORY_NETWORK, + [TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT] = + TOMOYO_MAC_CATEGORY_NETWORK, + [TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND] = + TOMOYO_MAC_CATEGORY_NETWORK, + [TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND] = + TOMOYO_MAC_CATEGORY_NETWORK, + [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND] = + TOMOYO_MAC_CATEGORY_NETWORK, + [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN] = + TOMOYO_MAC_CATEGORY_NETWORK, + [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT] = + TOMOYO_MAC_CATEGORY_NETWORK, + /* CONFIG::misc group */ + [TOMOYO_MAC_ENVIRON] = TOMOYO_MAC_CATEGORY_MISC, +}; + +/** + * tomoyo_convert_time - Convert time_t to YYYY/MM/DD hh/mm/ss. + * + * @time64: Seconds since 1970/01/01 00:00:00. + * @stamp: Pointer to "struct tomoyo_time". + * + * Returns nothing. + */ +void tomoyo_convert_time(time64_t time64, struct tomoyo_time *stamp) +{ + struct tm tm; + + time64_to_tm(time64, 0, &tm); + stamp->sec = tm.tm_sec; + stamp->min = tm.tm_min; + stamp->hour = tm.tm_hour; + stamp->day = tm.tm_mday; + stamp->month = tm.tm_mon + 1; + stamp->year = tm.tm_year + 1900; +} + +/** + * tomoyo_permstr - Find permission keywords. + * + * @string: String representation for permissions in foo/bar/buz format. + * @keyword: Keyword to find from @string/ + * + * Returns true if @keyword was found in @string, false otherwise. + * + * This function assumes that strncmp(w1, w2, strlen(w1)) != 0 if w1 != w2. + */ +bool tomoyo_permstr(const char *string, const char *keyword) +{ + const char *cp = strstr(string, keyword); + + if (cp) + return cp == string || *(cp - 1) == '/'; + return false; +} + +/** + * tomoyo_read_token - Read a word from a line. + * + * @param: Pointer to "struct tomoyo_acl_param". + * + * Returns a word on success, "" otherwise. + * + * To allow the caller to skip NULL check, this function returns "" rather than + * NULL if there is no more words to read. + */ +char *tomoyo_read_token(struct tomoyo_acl_param *param) +{ + char *pos = param->data; + char *del = strchr(pos, ' '); + + if (del) + *del++ = '\0'; + else + del = pos + strlen(pos); + param->data = del; + return pos; +} + +static bool tomoyo_correct_path2(const char *filename, const size_t len); + +/** + * tomoyo_get_domainname - Read a domainname from a line. + * + * @param: Pointer to "struct tomoyo_acl_param". + * + * Returns a domainname on success, NULL otherwise. + */ +const struct tomoyo_path_info *tomoyo_get_domainname +(struct tomoyo_acl_param *param) +{ + char *start = param->data; + char *pos = start; + + while (*pos) { + if (*pos++ != ' ' || + tomoyo_correct_path2(pos, strchrnul(pos, ' ') - pos)) + continue; + *(pos - 1) = '\0'; + break; + } + param->data = pos; + if (tomoyo_correct_domain(start)) + return tomoyo_get_name(start); + return NULL; +} + +/** + * tomoyo_parse_ulong - Parse an "unsigned long" value. + * + * @result: Pointer to "unsigned long". + * @str: Pointer to string to parse. + * + * Returns one of values in "enum tomoyo_value_type". + * + * The @src is updated to point the first character after the value + * on success. + */ +u8 tomoyo_parse_ulong(unsigned long *result, char **str) +{ + const char *cp = *str; + char *ep; + int base = 10; + + if (*cp == '0') { + char c = *(cp + 1); + + if (c == 'x' || c == 'X') { + base = 16; + cp += 2; + } else if (c >= '0' && c <= '7') { + base = 8; + cp++; + } + } + *result = simple_strtoul(cp, &ep, base); + if (cp == ep) + return TOMOYO_VALUE_TYPE_INVALID; + *str = ep; + switch (base) { + case 16: + return TOMOYO_VALUE_TYPE_HEXADECIMAL; + case 8: + return TOMOYO_VALUE_TYPE_OCTAL; + default: + return TOMOYO_VALUE_TYPE_DECIMAL; + } +} + +/** + * tomoyo_print_ulong - Print an "unsigned long" value. + * + * @buffer: Pointer to buffer. + * @buffer_len: Size of @buffer. + * @value: An "unsigned long" value. + * @type: Type of @value. + * + * Returns nothing. + */ +void tomoyo_print_ulong(char *buffer, const int buffer_len, + const unsigned long value, const u8 type) +{ + if (type == TOMOYO_VALUE_TYPE_DECIMAL) + snprintf(buffer, buffer_len, "%lu", value); + else if (type == TOMOYO_VALUE_TYPE_OCTAL) + snprintf(buffer, buffer_len, "0%lo", value); + else if (type == TOMOYO_VALUE_TYPE_HEXADECIMAL) + snprintf(buffer, buffer_len, "0x%lX", value); + else + snprintf(buffer, buffer_len, "type(%u)", type); +} + +/** + * tomoyo_parse_name_union - Parse a tomoyo_name_union. + * + * @param: Pointer to "struct tomoyo_acl_param". + * @ptr: Pointer to "struct tomoyo_name_union". + * + * Returns true on success, false otherwise. + */ +bool tomoyo_parse_name_union(struct tomoyo_acl_param *param, + struct tomoyo_name_union *ptr) +{ + char *filename; + + if (param->data[0] == '@') { + param->data++; + ptr->group = tomoyo_get_group(param, TOMOYO_PATH_GROUP); + return ptr->group != NULL; + } + filename = tomoyo_read_token(param); + if (!tomoyo_correct_word(filename)) + return false; + ptr->filename = tomoyo_get_name(filename); + return ptr->filename != NULL; +} + +/** + * tomoyo_parse_number_union - Parse a tomoyo_number_union. + * + * @param: Pointer to "struct tomoyo_acl_param". + * @ptr: Pointer to "struct tomoyo_number_union". + * + * Returns true on success, false otherwise. + */ +bool tomoyo_parse_number_union(struct tomoyo_acl_param *param, + struct tomoyo_number_union *ptr) +{ + char *data; + u8 type; + unsigned long v; + + memset(ptr, 0, sizeof(*ptr)); + if (param->data[0] == '@') { + param->data++; + ptr->group = tomoyo_get_group(param, TOMOYO_NUMBER_GROUP); + return ptr->group != NULL; + } + data = tomoyo_read_token(param); + type = tomoyo_parse_ulong(&v, &data); + if (type == TOMOYO_VALUE_TYPE_INVALID) + return false; + ptr->values[0] = v; + ptr->value_type[0] = type; + if (!*data) { + ptr->values[1] = v; + ptr->value_type[1] = type; + return true; + } + if (*data++ != '-') + return false; + type = tomoyo_parse_ulong(&v, &data); + if (type == TOMOYO_VALUE_TYPE_INVALID || *data || ptr->values[0] > v) + return false; + ptr->values[1] = v; + ptr->value_type[1] = type; + return true; +} + +/** + * tomoyo_byte_range - Check whether the string is a \ooo style octal value. + * + * @str: Pointer to the string. + * + * Returns true if @str is a \ooo style octal value, false otherwise. + * + * TOMOYO uses \ooo style representation for 0x01 - 0x20 and 0x7F - 0xFF. + * This function verifies that \ooo is in valid range. + */ +static inline bool tomoyo_byte_range(const char *str) +{ + return *str >= '0' && *str++ <= '3' && + *str >= '0' && *str++ <= '7' && + *str >= '0' && *str <= '7'; +} + +/** + * tomoyo_alphabet_char - Check whether the character is an alphabet. + * + * @c: The character to check. + * + * Returns true if @c is an alphabet character, false otherwise. + */ +static inline bool tomoyo_alphabet_char(const char c) +{ + return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'); +} + +/** + * tomoyo_make_byte - Make byte value from three octal characters. + * + * @c1: The first character. + * @c2: The second character. + * @c3: The third character. + * + * Returns byte value. + */ +static inline u8 tomoyo_make_byte(const u8 c1, const u8 c2, const u8 c3) +{ + return ((c1 - '0') << 6) + ((c2 - '0') << 3) + (c3 - '0'); +} + +/** + * tomoyo_valid - Check whether the character is a valid char. + * + * @c: The character to check. + * + * Returns true if @c is a valid character, false otherwise. + */ +static inline bool tomoyo_valid(const unsigned char c) +{ + return c > ' ' && c < 127; +} + +/** + * tomoyo_invalid - Check whether the character is an invalid char. + * + * @c: The character to check. + * + * Returns true if @c is an invalid character, false otherwise. + */ +static inline bool tomoyo_invalid(const unsigned char c) +{ + return c && (c <= ' ' || c >= 127); +} + +/** + * tomoyo_str_starts - Check whether the given string starts with the given keyword. + * + * @src: Pointer to pointer to the string. + * @find: Pointer to the keyword. + * + * Returns true if @src starts with @find, false otherwise. + * + * The @src is updated to point the first character after the @find + * if @src starts with @find. + */ +bool tomoyo_str_starts(char **src, const char *find) +{ + const int len = strlen(find); + char *tmp = *src; + + if (strncmp(tmp, find, len)) + return false; + tmp += len; + *src = tmp; + return true; +} + +/** + * tomoyo_normalize_line - Format string. + * + * @buffer: The line to normalize. + * + * Leading and trailing whitespaces are removed. + * Multiple whitespaces are packed into single space. + * + * Returns nothing. + */ +void tomoyo_normalize_line(unsigned char *buffer) +{ + unsigned char *sp = buffer; + unsigned char *dp = buffer; + bool first = true; + + while (tomoyo_invalid(*sp)) + sp++; + while (*sp) { + if (!first) + *dp++ = ' '; + first = false; + while (tomoyo_valid(*sp)) + *dp++ = *sp++; + while (tomoyo_invalid(*sp)) + sp++; + } + *dp = '\0'; +} + +/** + * tomoyo_correct_word2 - Validate a string. + * + * @string: The string to check. Maybe non-'\0'-terminated. + * @len: Length of @string. + * + * Check whether the given string follows the naming rules. + * Returns true if @string follows the naming rules, false otherwise. + */ +static bool tomoyo_correct_word2(const char *string, size_t len) +{ + u8 recursion = 20; + const char *const start = string; + bool in_repetition = false; + + if (!len) + goto out; + while (len--) { + unsigned char c = *string++; + + if (c == '\\') { + if (!len--) + goto out; + c = *string++; + if (c >= '0' && c <= '3') { + unsigned char d; + unsigned char e; + + if (!len-- || !len--) + goto out; + d = *string++; + e = *string++; + if (d < '0' || d > '7' || e < '0' || e > '7') + goto out; + c = tomoyo_make_byte(c, d, e); + if (c <= ' ' || c >= 127) + continue; + goto out; + } + switch (c) { + case '\\': /* "\\" */ + case '+': /* "\+" */ + case '?': /* "\?" */ + case 'x': /* "\x" */ + case 'a': /* "\a" */ + case '-': /* "\-" */ + continue; + } + if (!recursion--) + goto out; + switch (c) { + case '*': /* "\*" */ + case '@': /* "\@" */ + case '$': /* "\$" */ + case 'X': /* "\X" */ + case 'A': /* "\A" */ + continue; + case '{': /* "/\{" */ + if (string - 3 < start || *(string - 3) != '/') + goto out; + in_repetition = true; + continue; + case '}': /* "\}/" */ + if (*string != '/') + goto out; + if (!in_repetition) + goto out; + in_repetition = false; + continue; + } + goto out; + } else if (in_repetition && c == '/') { + goto out; + } else if (c <= ' ' || c >= 127) { + goto out; + } + } + if (in_repetition) + goto out; + return true; + out: + return false; +} + +/** + * tomoyo_correct_word - Validate a string. + * + * @string: The string to check. + * + * Check whether the given string follows the naming rules. + * Returns true if @string follows the naming rules, false otherwise. + */ +bool tomoyo_correct_word(const char *string) +{ + return tomoyo_correct_word2(string, strlen(string)); +} + +/** + * tomoyo_correct_path2 - Check whether the given pathname follows the naming rules. + * + * @filename: The pathname to check. + * @len: Length of @filename. + * + * Returns true if @filename follows the naming rules, false otherwise. + */ +static bool tomoyo_correct_path2(const char *filename, const size_t len) +{ + const char *cp1 = memchr(filename, '/', len); + const char *cp2 = memchr(filename, '.', len); + + return cp1 && (!cp2 || (cp1 < cp2)) && tomoyo_correct_word2(filename, len); +} + +/** + * tomoyo_correct_path - Validate a pathname. + * + * @filename: The pathname to check. + * + * Check whether the given pathname follows the naming rules. + * Returns true if @filename follows the naming rules, false otherwise. + */ +bool tomoyo_correct_path(const char *filename) +{ + return tomoyo_correct_path2(filename, strlen(filename)); +} + +/** + * tomoyo_correct_domain - Check whether the given domainname follows the naming rules. + * + * @domainname: The domainname to check. + * + * Returns true if @domainname follows the naming rules, false otherwise. + */ +bool tomoyo_correct_domain(const unsigned char *domainname) +{ + if (!domainname || !tomoyo_domain_def(domainname)) + return false; + domainname = strchr(domainname, ' '); + if (!domainname++) + return true; + while (1) { + const unsigned char *cp = strchr(domainname, ' '); + + if (!cp) + break; + if (!tomoyo_correct_path2(domainname, cp - domainname)) + return false; + domainname = cp + 1; + } + return tomoyo_correct_path(domainname); +} + +/** + * tomoyo_domain_def - Check whether the given token can be a domainname. + * + * @buffer: The token to check. + * + * Returns true if @buffer possibly be a domainname, false otherwise. + */ +bool tomoyo_domain_def(const unsigned char *buffer) +{ + const unsigned char *cp; + int len; + + if (*buffer != '<') + return false; + cp = strchr(buffer, ' '); + if (!cp) + len = strlen(buffer); + else + len = cp - buffer; + if (buffer[len - 1] != '>' || + !tomoyo_correct_word2(buffer + 1, len - 2)) + return false; + return true; +} + +/** + * tomoyo_find_domain - Find a domain by the given name. + * + * @domainname: The domainname to find. + * + * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise. + * + * Caller holds tomoyo_read_lock(). + */ +struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname) +{ + struct tomoyo_domain_info *domain; + struct tomoyo_path_info name; + + name.name = domainname; + tomoyo_fill_path_info(&name); + list_for_each_entry_rcu(domain, &tomoyo_domain_list, list, + srcu_read_lock_held(&tomoyo_ss)) { + if (!domain->is_deleted && + !tomoyo_pathcmp(&name, domain->domainname)) + return domain; + } + return NULL; +} + +/** + * tomoyo_const_part_length - Evaluate the initial length without a pattern in a token. + * + * @filename: The string to evaluate. + * + * Returns the initial length without a pattern in @filename. + */ +static int tomoyo_const_part_length(const char *filename) +{ + char c; + int len = 0; + + if (!filename) + return 0; + while ((c = *filename++) != '\0') { + if (c != '\\') { + len++; + continue; + } + c = *filename++; + switch (c) { + case '\\': /* "\\" */ + len += 2; + continue; + case '0': /* "\ooo" */ + case '1': + case '2': + case '3': + c = *filename++; + if (c < '0' || c > '7') + break; + c = *filename++; + if (c < '0' || c > '7') + break; + len += 4; + continue; + } + break; + } + return len; +} + +/** + * tomoyo_fill_path_info - Fill in "struct tomoyo_path_info" members. + * + * @ptr: Pointer to "struct tomoyo_path_info" to fill in. + * + * The caller sets "struct tomoyo_path_info"->name. + */ +void tomoyo_fill_path_info(struct tomoyo_path_info *ptr) +{ + const char *name = ptr->name; + const int len = strlen(name); + + ptr->const_len = tomoyo_const_part_length(name); + ptr->is_dir = len && (name[len - 1] == '/'); + ptr->is_patterned = (ptr->const_len < len); + ptr->hash = full_name_hash(NULL, name, len); +} + +/** + * tomoyo_file_matches_pattern2 - Pattern matching without '/' character and "\-" pattern. + * + * @filename: The start of string to check. + * @filename_end: The end of string to check. + * @pattern: The start of pattern to compare. + * @pattern_end: The end of pattern to compare. + * + * Returns true if @filename matches @pattern, false otherwise. + */ +static bool tomoyo_file_matches_pattern2(const char *filename, + const char *filename_end, + const char *pattern, + const char *pattern_end) +{ + while (filename < filename_end && pattern < pattern_end) { + char c; + int i; + int j; + + if (*pattern != '\\') { + if (*filename++ != *pattern++) + return false; + continue; + } + c = *filename; + pattern++; + switch (*pattern) { + case '?': + if (c == '/') { + return false; + } else if (c == '\\') { + if (filename[1] == '\\') + filename++; + else if (tomoyo_byte_range(filename + 1)) + filename += 3; + else + return false; + } + break; + case '\\': + if (c != '\\') + return false; + if (*++filename != '\\') + return false; + break; + case '+': + if (!isdigit(c)) + return false; + break; + case 'x': + if (!isxdigit(c)) + return false; + break; + case 'a': + if (!tomoyo_alphabet_char(c)) + return false; + break; + case '0': + case '1': + case '2': + case '3': + if (c == '\\' && tomoyo_byte_range(filename + 1) + && strncmp(filename + 1, pattern, 3) == 0) { + filename += 3; + pattern += 2; + break; + } + return false; /* Not matched. */ + case '*': + case '@': + for (i = 0; i <= filename_end - filename; i++) { + if (tomoyo_file_matches_pattern2( + filename + i, filename_end, + pattern + 1, pattern_end)) + return true; + c = filename[i]; + if (c == '.' && *pattern == '@') + break; + if (c != '\\') + continue; + if (filename[i + 1] == '\\') + i++; + else if (tomoyo_byte_range(filename + i + 1)) + i += 3; + else + break; /* Bad pattern. */ + } + return false; /* Not matched. */ + default: + j = 0; + c = *pattern; + if (c == '$') { + while (isdigit(filename[j])) + j++; + } else if (c == 'X') { + while (isxdigit(filename[j])) + j++; + } else if (c == 'A') { + while (tomoyo_alphabet_char(filename[j])) + j++; + } + for (i = 1; i <= j; i++) { + if (tomoyo_file_matches_pattern2( + filename + i, filename_end, + pattern + 1, pattern_end)) + return true; + } + return false; /* Not matched or bad pattern. */ + } + filename++; + pattern++; + } + while (*pattern == '\\' && + (*(pattern + 1) == '*' || *(pattern + 1) == '@')) + pattern += 2; + return filename == filename_end && pattern == pattern_end; +} + +/** + * tomoyo_file_matches_pattern - Pattern matching without '/' character. + * + * @filename: The start of string to check. + * @filename_end: The end of string to check. + * @pattern: The start of pattern to compare. + * @pattern_end: The end of pattern to compare. + * + * Returns true if @filename matches @pattern, false otherwise. + */ +static bool tomoyo_file_matches_pattern(const char *filename, + const char *filename_end, + const char *pattern, + const char *pattern_end) +{ + const char *pattern_start = pattern; + bool first = true; + bool result; + + while (pattern < pattern_end - 1) { + /* Split at "\-" pattern. */ + if (*pattern++ != '\\' || *pattern++ != '-') + continue; + result = tomoyo_file_matches_pattern2(filename, + filename_end, + pattern_start, + pattern - 2); + if (first) + result = !result; + if (result) + return false; + first = false; + pattern_start = pattern; + } + result = tomoyo_file_matches_pattern2(filename, filename_end, + pattern_start, pattern_end); + return first ? result : !result; +} + +/** + * tomoyo_path_matches_pattern2 - Do pathname pattern matching. + * + * @f: The start of string to check. + * @p: The start of pattern to compare. + * + * Returns true if @f matches @p, false otherwise. + */ +static bool tomoyo_path_matches_pattern2(const char *f, const char *p) +{ + const char *f_delimiter; + const char *p_delimiter; + + while (*f && *p) { + f_delimiter = strchr(f, '/'); + if (!f_delimiter) + f_delimiter = f + strlen(f); + p_delimiter = strchr(p, '/'); + if (!p_delimiter) + p_delimiter = p + strlen(p); + if (*p == '\\' && *(p + 1) == '{') + goto recursive; + if (!tomoyo_file_matches_pattern(f, f_delimiter, p, + p_delimiter)) + return false; + f = f_delimiter; + if (*f) + f++; + p = p_delimiter; + if (*p) + p++; + } + /* Ignore trailing "\*" and "\@" in @pattern. */ + while (*p == '\\' && + (*(p + 1) == '*' || *(p + 1) == '@')) + p += 2; + return !*f && !*p; + recursive: + /* + * The "\{" pattern is permitted only after '/' character. + * This guarantees that below "*(p - 1)" is safe. + * Also, the "\}" pattern is permitted only before '/' character + * so that "\{" + "\}" pair will not break the "\-" operator. + */ + if (*(p - 1) != '/' || p_delimiter <= p + 3 || *p_delimiter != '/' || + *(p_delimiter - 1) != '}' || *(p_delimiter - 2) != '\\') + return false; /* Bad pattern. */ + do { + /* Compare current component with pattern. */ + if (!tomoyo_file_matches_pattern(f, f_delimiter, p + 2, + p_delimiter - 2)) + break; + /* Proceed to next component. */ + f = f_delimiter; + if (!*f) + break; + f++; + /* Continue comparison. */ + if (tomoyo_path_matches_pattern2(f, p_delimiter + 1)) + return true; + f_delimiter = strchr(f, '/'); + } while (f_delimiter); + return false; /* Not matched. */ +} + +/** + * tomoyo_path_matches_pattern - Check whether the given filename matches the given pattern. + * + * @filename: The filename to check. + * @pattern: The pattern to compare. + * + * Returns true if matches, false otherwise. + * + * The following patterns are available. + * \\ \ itself. + * \ooo Octal representation of a byte. + * \* Zero or more repetitions of characters other than '/'. + * \@ Zero or more repetitions of characters other than '/' or '.'. + * \? 1 byte character other than '/'. + * \$ One or more repetitions of decimal digits. + * \+ 1 decimal digit. + * \X One or more repetitions of hexadecimal digits. + * \x 1 hexadecimal digit. + * \A One or more repetitions of alphabet characters. + * \a 1 alphabet character. + * + * \- Subtraction operator. + * + * /\{dir\}/ '/' + 'One or more repetitions of dir/' (e.g. /dir/ /dir/dir/ + * /dir/dir/dir/ ). + */ +bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename, + const struct tomoyo_path_info *pattern) +{ + const char *f = filename->name; + const char *p = pattern->name; + const int len = pattern->const_len; + + /* If @pattern doesn't contain pattern, I can use strcmp(). */ + if (!pattern->is_patterned) + return !tomoyo_pathcmp(filename, pattern); + /* Don't compare directory and non-directory. */ + if (filename->is_dir != pattern->is_dir) + return false; + /* Compare the initial length without patterns. */ + if (strncmp(f, p, len)) + return false; + f += len; + p += len; + return tomoyo_path_matches_pattern2(f, p); +} + +/** + * tomoyo_get_exe - Get tomoyo_realpath() of current process. + * + * Returns the tomoyo_realpath() of current process on success, NULL otherwise. + * + * This function uses kzalloc(), so the caller must call kfree() + * if this function didn't return NULL. + */ +const char *tomoyo_get_exe(void) +{ + struct file *exe_file; + const char *cp; + struct mm_struct *mm = current->mm; + + if (!mm) + return NULL; + exe_file = get_mm_exe_file(mm); + if (!exe_file) + return NULL; + + cp = tomoyo_realpath_from_path(&exe_file->f_path); + fput(exe_file); + return cp; +} + +/** + * tomoyo_get_mode - Get MAC mode. + * + * @ns: Pointer to "struct tomoyo_policy_namespace". + * @profile: Profile number. + * @index: Index number of functionality. + * + * Returns mode. + */ +int tomoyo_get_mode(const struct tomoyo_policy_namespace *ns, const u8 profile, + const u8 index) +{ + u8 mode; + struct tomoyo_profile *p; + + if (!tomoyo_policy_loaded) + return TOMOYO_CONFIG_DISABLED; + p = tomoyo_profile(ns, profile); + mode = p->config[index]; + if (mode == TOMOYO_CONFIG_USE_DEFAULT) + mode = p->config[tomoyo_index2category[index] + + TOMOYO_MAX_MAC_INDEX]; + if (mode == TOMOYO_CONFIG_USE_DEFAULT) + mode = p->default_config; + return mode & 3; +} + +/** + * tomoyo_init_request_info - Initialize "struct tomoyo_request_info" members. + * + * @r: Pointer to "struct tomoyo_request_info" to initialize. + * @domain: Pointer to "struct tomoyo_domain_info". NULL for tomoyo_domain(). + * @index: Index number of functionality. + * + * Returns mode. + */ +int tomoyo_init_request_info(struct tomoyo_request_info *r, + struct tomoyo_domain_info *domain, const u8 index) +{ + u8 profile; + + memset(r, 0, sizeof(*r)); + if (!domain) + domain = tomoyo_domain(); + r->domain = domain; + profile = domain->profile; + r->profile = profile; + r->type = index; + r->mode = tomoyo_get_mode(domain->ns, profile, index); + return r->mode; +} + +/** + * tomoyo_domain_quota_is_ok - Check for domain's quota. + * + * @r: Pointer to "struct tomoyo_request_info". + * + * Returns true if the domain is not exceeded quota, false otherwise. + * + * Caller holds tomoyo_read_lock(). + */ +bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r) +{ + unsigned int count = 0; + struct tomoyo_domain_info *domain = r->domain; + struct tomoyo_acl_info *ptr; + + if (r->mode != TOMOYO_CONFIG_LEARNING) + return false; + if (!domain) + return true; + if (READ_ONCE(domain->flags[TOMOYO_DIF_QUOTA_WARNED])) + return false; + list_for_each_entry_rcu(ptr, &domain->acl_info_list, list, + srcu_read_lock_held(&tomoyo_ss)) { + u16 perm; + + if (ptr->is_deleted) + continue; + /* + * Reading perm bitmap might race with tomoyo_merge_*() because + * caller does not hold tomoyo_policy_lock mutex. But exceeding + * max_learning_entry parameter by a few entries does not harm. + */ + switch (ptr->type) { + case TOMOYO_TYPE_PATH_ACL: + perm = data_race(container_of(ptr, struct tomoyo_path_acl, head)->perm); + break; + case TOMOYO_TYPE_PATH2_ACL: + perm = data_race(container_of(ptr, struct tomoyo_path2_acl, head)->perm); + break; + case TOMOYO_TYPE_PATH_NUMBER_ACL: + perm = data_race(container_of(ptr, struct tomoyo_path_number_acl, head) + ->perm); + break; + case TOMOYO_TYPE_MKDEV_ACL: + perm = data_race(container_of(ptr, struct tomoyo_mkdev_acl, head)->perm); + break; + case TOMOYO_TYPE_INET_ACL: + perm = data_race(container_of(ptr, struct tomoyo_inet_acl, head)->perm); + break; + case TOMOYO_TYPE_UNIX_ACL: + perm = data_race(container_of(ptr, struct tomoyo_unix_acl, head)->perm); + break; + case TOMOYO_TYPE_MANUAL_TASK_ACL: + perm = 0; + break; + default: + perm = 1; + } + count += hweight16(perm); + } + if (count < tomoyo_profile(domain->ns, domain->profile)-> + pref[TOMOYO_PREF_MAX_LEARNING_ENTRY]) + return true; + WRITE_ONCE(domain->flags[TOMOYO_DIF_QUOTA_WARNED], true); + /* r->granted = false; */ + tomoyo_write_log(r, "%s", tomoyo_dif[TOMOYO_DIF_QUOTA_WARNED]); +#ifndef CONFIG_SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING + pr_warn("WARNING: Domain '%s' has too many ACLs to hold. Stopped learning mode.\n", + domain->domainname->name); +#endif + return false; +} |