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-rw-r--r--security/tomoyo/util.c1106
1 files changed, 1106 insertions, 0 deletions
diff --git a/security/tomoyo/util.c b/security/tomoyo/util.c
new file mode 100644
index 0000000000..6799b1122c
--- /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;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 07:46:23 +0000