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Subject[TOMOYO #16 18/25] TOMOYO: Add utility functions.
This file contains utility functions.

There are two major changes compared to TOMOYO 2.2.0.

One is that garbage collector support is added.
tomoyo_read_lock()/tomoyo_read_unlock() protects the data against
the garbage collector.

The other is that the wildcard for recursive directory matching support is
added. For example, /var/www/html/\{\*\-.svn\-CVS\}/\*\-.\* matches
/var/www/html/\*\-.svn\-CVS/\*\-.\*
/var/www/html/\*\-.svn\-CVS/\*\-.svn\-CVS/\*\-.\*
/var/www/html/\*\-.svn\-CVS/\*\-.svn\-CVS/\*\-.svn\-CVS/\*\-.\*
etc.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
---
security/tomoyo/util.c | 1144 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 1144 insertions(+)

--- /dev/null
+++ security-testing-2.6/security/tomoyo/util.c
@@ -0,0 +1,1144 @@
+/*
+ * security/tomoyo/util.c
+ *
+ * Copyright (C) 2005-2009 NTT DATA CORPORATION
+ */
+#include "internal.h"
+
+/* Lock for protecting policy. */
+DEFINE_MUTEX(tomoyo_policy_lock);
+
+/* Has /sbin/init started? */
+bool tomoyo_policy_loaded;
+
+/* Index table for searching parent category. */
+static const u8 tomoyo_index2category[TOMOYO_MAX_MAC_INDEX +
+ TOMOYO_MAX_CAPABILITY_INDEX] = {
+ [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_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_REWRITE] = 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,
+ [TOMOYO_MAC_ENVIRON] = TOMOYO_MAC_CATEGORY_MISC,
+ [TOMOYO_MAC_NETWORK_UDP_BIND] = TOMOYO_MAC_CATEGORY_NETWORK,
+ [TOMOYO_MAC_NETWORK_UDP_CONNECT] = TOMOYO_MAC_CATEGORY_NETWORK,
+ [TOMOYO_MAC_NETWORK_TCP_BIND] = TOMOYO_MAC_CATEGORY_NETWORK,
+ [TOMOYO_MAC_NETWORK_TCP_LISTEN] = TOMOYO_MAC_CATEGORY_NETWORK,
+ [TOMOYO_MAC_NETWORK_TCP_CONNECT] = TOMOYO_MAC_CATEGORY_NETWORK,
+ [TOMOYO_MAC_NETWORK_RAW_BIND] = TOMOYO_MAC_CATEGORY_NETWORK,
+ [TOMOYO_MAC_NETWORK_RAW_CONNECT] = TOMOYO_MAC_CATEGORY_NETWORK,
+ [TOMOYO_MAX_MAC_INDEX + TOMOYO_INET_STREAM_SOCKET_CREATE]
+ = TOMOYO_MAC_CATEGORY_CAPABILITY,
+ [TOMOYO_MAX_MAC_INDEX + TOMOYO_INET_STREAM_SOCKET_LISTEN]
+ = TOMOYO_MAC_CATEGORY_CAPABILITY,
+ [TOMOYO_MAX_MAC_INDEX + TOMOYO_INET_STREAM_SOCKET_CONNECT]
+ = TOMOYO_MAC_CATEGORY_CAPABILITY,
+ [TOMOYO_MAX_MAC_INDEX + TOMOYO_USE_INET_DGRAM_SOCKET]
+ = TOMOYO_MAC_CATEGORY_CAPABILITY,
+ [TOMOYO_MAX_MAC_INDEX + TOMOYO_USE_INET_RAW_SOCKET]
+ = TOMOYO_MAC_CATEGORY_CAPABILITY,
+ [TOMOYO_MAX_MAC_INDEX + TOMOYO_USE_ROUTE_SOCKET]
+ = TOMOYO_MAC_CATEGORY_CAPABILITY,
+ [TOMOYO_MAX_MAC_INDEX + TOMOYO_USE_PACKET_SOCKET]
+ = TOMOYO_MAC_CATEGORY_CAPABILITY,
+ [TOMOYO_MAX_MAC_INDEX + TOMOYO_SYS_MOUNT]
+ = TOMOYO_MAC_CATEGORY_CAPABILITY,
+ [TOMOYO_MAX_MAC_INDEX + TOMOYO_SYS_UMOUNT]
+ = TOMOYO_MAC_CATEGORY_CAPABILITY,
+ [TOMOYO_MAX_MAC_INDEX + TOMOYO_SYS_CHROOT]
+ = TOMOYO_MAC_CATEGORY_CAPABILITY,
+ [TOMOYO_MAX_MAC_INDEX + TOMOYO_CREATE_FIFO]
+ = TOMOYO_MAC_CATEGORY_CAPABILITY,
+ [TOMOYO_MAX_MAC_INDEX + TOMOYO_CREATE_BLOCK_DEV]
+ = TOMOYO_MAC_CATEGORY_CAPABILITY,
+ [TOMOYO_MAX_MAC_INDEX + TOMOYO_CREATE_CHAR_DEV]
+ = TOMOYO_MAC_CATEGORY_CAPABILITY,
+ [TOMOYO_MAX_MAC_INDEX + TOMOYO_CREATE_UNIX_SOCKET]
+ = TOMOYO_MAC_CATEGORY_CAPABILITY,
+ [TOMOYO_MAX_MAC_INDEX + TOMOYO_SYS_LINK]
+ = TOMOYO_MAC_CATEGORY_CAPABILITY,
+ [TOMOYO_MAX_MAC_INDEX + TOMOYO_SYS_SYMLINK]
+ = TOMOYO_MAC_CATEGORY_CAPABILITY,
+ [TOMOYO_MAX_MAC_INDEX + TOMOYO_SYS_RENAME]
+ = TOMOYO_MAC_CATEGORY_CAPABILITY,
+ [TOMOYO_MAX_MAC_INDEX + TOMOYO_SYS_UNLINK]
+ = TOMOYO_MAC_CATEGORY_CAPABILITY,
+ [TOMOYO_MAX_MAC_INDEX + TOMOYO_SYS_CHMOD]
+ = TOMOYO_MAC_CATEGORY_CAPABILITY,
+ [TOMOYO_MAX_MAC_INDEX + TOMOYO_SYS_CHOWN]
+ = TOMOYO_MAC_CATEGORY_CAPABILITY,
+ [TOMOYO_MAX_MAC_INDEX + TOMOYO_SYS_IOCTL]
+ = TOMOYO_MAC_CATEGORY_CAPABILITY,
+ [TOMOYO_MAX_MAC_INDEX + TOMOYO_SYS_PIVOT_ROOT]
+ = TOMOYO_MAC_CATEGORY_CAPABILITY,
+};
+
+/* Utility functions. */
+
+/**
+ * tomoyo_parse_ulong - Parse an "unsigned long" value.
+ *
+ * @result: Pointer to "unsigned long".
+ * @str: Pointer to string to parse.
+ *
+ * Returns value type on success, 0 otherwise.
+ *
+ * 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 0;
+ *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.
+ *
+ * @filename: Name or name group.
+ * @ptr: Pointer to "struct tomoyo_name_union".
+ *
+ * Returns true on success, false otherwise.
+ */
+bool tomoyo_parse_name_union(const char *filename,
+ struct tomoyo_name_union *ptr)
+{
+ if (!tomoyo_is_correct_path(filename, 0, 0, 0))
+ return false;
+ if (filename[0] == '@') {
+ ptr->group = tomoyo_get_path_group(filename + 1);
+ ptr->is_group = true;
+ return ptr->group != NULL;
+ }
+ ptr->filename = tomoyo_get_name(filename);
+ ptr->is_group = false;
+ return ptr->filename != NULL;
+}
+
+/**
+ * tomoyo_parse_number_union - Parse a tomoyo_number_union.
+ *
+ * @data: Number or number range or number group.
+ * @ptr: Pointer to "struct tomoyo_number_union".
+ *
+ * Returns true on success, false otherwise.
+ */
+bool tomoyo_parse_number_union(char *data, struct tomoyo_number_union *num)
+{
+ u8 type;
+ unsigned long v;
+ memset(num, 0, sizeof(*num));
+ if (data[0] == '@') {
+ if (!tomoyo_is_correct_path(data, 0, 0, 0))
+ return false;
+ num->group = tomoyo_get_number_group(data + 1);
+ num->is_group = true;
+ return num->group != NULL;
+ }
+ type = tomoyo_parse_ulong(&v, &data);
+ if (!type)
+ return false;
+ num->values[0] = v;
+ num->min_type = type;
+ if (!*data) {
+ num->values[1] = v;
+ num->max_type = type;
+ return true;
+ }
+ if (*data++ != '-')
+ return false;
+ type = tomoyo_parse_ulong(&v, &data);
+ if (!type || *data)
+ return false;
+ num->values[1] = v;
+ num->max_type = type;
+ return true;
+}
+
+/**
+ * tomoyo_is_byte_range - Check whether the string isa \ooo style octal value.
+ *
+ * @str: Pointer to the string.
+ *
+ * Returns true if @str is a \ooo style octal value, false otherwise.
+ */
+static inline bool tomoyo_is_byte_range(const char *str)
+{
+ return *str >= '0' && *str++ <= '3' &&
+ *str >= '0' && *str++ <= '7' &&
+ *str >= '0' && *str <= '7';
+}
+
+/**
+ * tomoyo_is_decimal - Check whether the character is a decimal character.
+ *
+ * @c: The character to check.
+ *
+ * Returns true if @c is a decimal character, false otherwise.
+ */
+static inline bool tomoyo_is_decimal(const char c)
+{
+ return c >= '0' && c <= '9';
+}
+
+/**
+ * tomoyo_is_hexadecimal - Check whether the character is a hexadecimal character.
+ *
+ * @c: The character to check.
+ *
+ * Returns true if @c is a hexadecimal character, false otherwise.
+ */
+static inline bool tomoyo_is_hexadecimal(const char c)
+{
+ return (c >= '0' && c <= '9') ||
+ (c >= 'A' && c <= 'F') ||
+ (c >= 'a' && c <= 'f');
+}
+
+/**
+ * tomoyo_is_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_is_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_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 (*sp && (*sp <= ' ' || *sp >= 127))
+ sp++;
+ while (*sp) {
+ if (!first)
+ *dp++ = ' ';
+ first = false;
+ while (*sp > ' ' && *sp < 127)
+ *dp++ = *sp++;
+ while (*sp && (*sp <= ' ' || *sp >= 127))
+ sp++;
+ }
+ *dp = '\0';
+}
+
+/**
+ * tomoyo_tokenize - Tokenize string.
+ *
+ * @buffer: The line to tokenize.
+ * @w: Pointer to "char *".
+ * @size: Sizeof @w .
+ *
+ * Returns true on success, false otherwise.
+ */
+bool tomoyo_tokenize(char *buffer, char *w[], size_t size)
+{
+ int count = size / sizeof(char *);
+ int i;
+ for (i = 0; i < count; i++)
+ w[i] = "";
+ for (i = 0; i < count; i++) {
+ char *cp = strchr(buffer, ' ');
+ if (cp)
+ *cp = '\0';
+ w[i] = buffer;
+ if (!cp)
+ break;
+ buffer = cp + 1;
+ }
+ return i < count || !*buffer;
+}
+
+/**
+ * tomoyo_is_correct_path - Validate a pathname.
+ *
+ * @filename: The pathname to check.
+ * @start_type: Should the pathname start with '/'?
+ * 1 = must / -1 = must not / 0 = don't care
+ * @pattern_type: Can the pathname contain a wildcard?
+ * 1 = must / -1 = must not / 0 = don't care
+ * @end_type: Should the pathname end with '/'?
+ * 1 = must / -1 = must not / 0 = don't care
+ *
+ * Check whether the given filename follows the naming rules.
+ * Returns true if @filename follows the naming rules, false otherwise.
+ */
+bool tomoyo_is_correct_path(const char *filename, const s8 start_type,
+ const s8 pattern_type, const s8 end_type)
+{
+ const char *const start = filename;
+ bool in_repetition = false;
+ bool contains_pattern = false;
+ unsigned char c;
+ unsigned char d;
+ unsigned char e;
+ if (!filename)
+ goto out;
+ c = *filename;
+ if (start_type == 1) { /* Must start with '/' */
+ if (c != '/')
+ goto out;
+ } else if (start_type == -1) { /* Must not start with '/' */
+ if (c == '/')
+ goto out;
+ }
+ if (c)
+ c = *(filename + strlen(filename) - 1);
+ if (end_type == 1) { /* Must end with '/' */
+ if (c != '/')
+ goto out;
+ } else if (end_type == -1) { /* Must not end with '/' */
+ if (c == '/')
+ goto out;
+ }
+ while (1) {
+ c = *filename++;
+ if (!c)
+ break;
+ if (c == '\\') {
+ c = *filename++;
+ switch (c) {
+ case '\\': /* "\\" */
+ continue;
+ case '$': /* "\$" */
+ case '+': /* "\+" */
+ case '?': /* "\?" */
+ case '*': /* "\*" */
+ case '@': /* "\@" */
+ case 'x': /* "\x" */
+ case 'X': /* "\X" */
+ case 'a': /* "\a" */
+ case 'A': /* "\A" */
+ case '-': /* "\-" */
+ if (pattern_type == -1)
+ break; /* Must not contain pattern */
+ contains_pattern = true;
+ continue;
+ case '{': /* "/\{" */
+ if (filename - 3 < start ||
+ *(filename - 3) != '/')
+ break;
+ if (pattern_type == -1)
+ break; /* Must not contain pattern */
+ contains_pattern = true;
+ in_repetition = true;
+ continue;
+ case '}': /* "\}/" */
+ if (*filename != '/')
+ break;
+ if (!in_repetition)
+ break;
+ in_repetition = false;
+ continue;
+ case '0': /* "\ooo" */
+ case '1':
+ case '2':
+ case '3':
+ d = *filename++;
+ if (d < '0' || d > '7')
+ break;
+ e = *filename++;
+ if (e < '0' || e > '7')
+ break;
+ c = tomoyo_make_byte(c, d, e);
+ if (c && (c <= ' ' || c >= 127))
+ continue; /* pattern is not \000 */
+ }
+ goto out;
+ } else if (in_repetition && c == '/') {
+ goto out;
+ } else if (c <= ' ' || c >= 127) {
+ goto out;
+ }
+ }
+ if (pattern_type == 1) { /* Must contain pattern */
+ if (!contains_pattern)
+ goto out;
+ }
+ if (in_repetition)
+ goto out;
+ return true;
+ out:
+ return false;
+}
+
+/**
+ * tomoyo_is_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_is_correct_domain(const unsigned char *domainname)
+{
+ unsigned char c;
+ unsigned char d;
+ unsigned char e;
+ if (!domainname || strncmp(domainname, ROOT_NAME, ROOT_NAME_LEN))
+ goto out;
+ domainname += ROOT_NAME_LEN;
+ if (!*domainname)
+ return true;
+ do {
+ if (*domainname++ != ' ')
+ goto out;
+ if (*domainname++ != '/')
+ goto out;
+ while (1) {
+ c = *domainname;
+ if (!c || c == ' ')
+ break;
+ domainname++;
+ if (c == '\\') {
+ c = *domainname++;
+ switch ((c)) {
+ case '\\': /* "\\" */
+ continue;
+ case '0': /* "\ooo" */
+ case '1':
+ case '2':
+ case '3':
+ d = *domainname++;
+ if (d < '0' || d > '7')
+ break;
+ e = *domainname++;
+ if (e < '0' || e > '7')
+ break;
+ c = tomoyo_make_byte(c, d, e);
+ if (c && (c <= ' ' || c >= 127))
+ /* pattern is not \000 */
+ continue;
+ }
+ goto out;
+ } else if (c < ' ' || c >= 127) {
+ goto out;
+ }
+ }
+ } while (*domainname);
+ return true;
+ out:
+ return false;
+}
+
+/**
+ * tomoyo_is_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_is_domain_def(const unsigned char *buffer)
+{
+ return !strncmp(buffer, ROOT_NAME, ROOT_NAME_LEN);
+}
+
+/**
+ * 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) {
+ 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 (1) {
+ c = *filename++;
+ if (!c)
+ break;
+ 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(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;
+ if (*pattern != '\\') {
+ if (*filename++ != *pattern++)
+ return false;
+ continue;
+ }
+ c = *filename;
+ pattern++;
+ switch (*pattern) {
+ int i;
+ int j;
+ case '?':
+ if (c == '/') {
+ return false;
+ } else if (c == '\\') {
+ if (filename[1] == '\\')
+ filename++;
+ else if (tomoyo_is_byte_range(filename + 1))
+ filename += 3;
+ else
+ return false;
+ }
+ break;
+ case '\\':
+ if (c != '\\')
+ return false;
+ if (*++filename != '\\')
+ return false;
+ break;
+ case '+':
+ if (!tomoyo_is_decimal(c))
+ return false;
+ break;
+ case 'x':
+ if (!tomoyo_is_hexadecimal(c))
+ return false;
+ break;
+ case 'a':
+ if (!tomoyo_is_alphabet_char(c))
+ return false;
+ break;
+ case '0':
+ case '1':
+ case '2':
+ case '3':
+ if (c == '\\' && tomoyo_is_byte_range(filename + 1)
+ && !strncmp(filename + 1, pattern, 3)) {
+ 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_is_byte_range(filename + i
+ + 1))
+ i += 3;
+ else
+ break; /* Bad pattern. */
+ }
+ return false; /* Not matched. */
+ default:
+ j = 0;
+ c = *pattern;
+ if (c == '$') {
+ while (tomoyo_is_decimal(filename[j]))
+ j++;
+ } else if (c == 'X') {
+ while (tomoyo_is_hexadecimal(filename[j]))
+ j++;
+ } else if (c == 'A') {
+ while (tomoyo_is_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 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 kfree()
+ * if this function didn't return NULL.
+ */
+const char *tomoyo_get_exe(void)
+{
+ struct mm_struct *mm = current->mm;
+ struct vm_area_struct *vma;
+ const char *cp = NULL;
+ if (!mm)
+ return NULL;
+ down_read(&mm->mmap_sem);
+ for (vma = mm->mmap; vma; vma = vma->vm_next) {
+ if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file) {
+ cp = tomoyo_realpath_from_path(&vma->vm_file->f_path);
+ break;
+ }
+ }
+ up_read(&mm->mmap_sem);
+ return cp;
+}
+
+/**
+ * tomoyo_get_audit - Get audit mode.
+ *
+ * @profile: Profile number.
+ * @index: Index number of functionality.
+ * @is_granted: True if granted log, false otehrwise.
+ *
+ * Returns mode.
+ */
+bool tomoyo_get_audit(const u8 profile, const u8 index, const bool is_granted)
+{
+ u8 mode;
+ const u8 category = tomoyo_index2category[index] + TOMOYO_MAX_MAC_INDEX
+ + TOMOYO_MAX_CAPABILITY_INDEX;
+ if (!tomoyo_policy_loaded)
+ return false;
+ mode = tomoyo_profile(profile)->config[index];
+ if (mode == TOMOYO_CONFIG_USE_DEFAULT)
+ mode = tomoyo_profile(profile)->config[category];
+ if (mode == TOMOYO_CONFIG_USE_DEFAULT)
+ mode = tomoyo_profile(profile)->default_config;
+ if (is_granted)
+ return mode & TOMOYO_CONFIG_WANT_GRANT_LOG;
+ return mode & TOMOYO_CONFIG_WANT_REJECT_LOG;
+}
+
+/**
+ * tomoyo_get_mode - Get MAC mode.
+ *
+ * @profile: Profile number.
+ * @index: Index number of functionality.
+ *
+ * Returns mode.
+ */
+int tomoyo_get_mode(const u8 profile, const u8 index)
+{
+ u8 mode;
+ const u8 category = tomoyo_index2category[index] + TOMOYO_MAX_MAC_INDEX
+ + TOMOYO_MAX_CAPABILITY_INDEX;
+ if (!tomoyo_policy_loaded)
+ return TOMOYO_CONFIG_DISABLED;
+ mode = tomoyo_profile(profile)->config[index];
+ if (mode == TOMOYO_CONFIG_USE_DEFAULT)
+ mode = tomoyo_profile(profile)->config[category];
+ if (mode == TOMOYO_CONFIG_USE_DEFAULT)
+ mode = tomoyo_profile(profile)->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_current_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_current_domain();
+ r->domain = domain;
+ profile = domain->profile;
+ r->profile = profile;
+ r->type = index;
+ r->mode = tomoyo_get_mode(profile, index);
+ return r->mode;
+}
+
+/**
+ * tomoyo_last_word - Get last component of a line.
+ *
+ * @line: A line.
+ *
+ * Returns the last word of a line.
+ */
+const char *tomoyo_last_word(const char *name)
+{
+ const char *cp = strrchr(name, ' ');
+ if (cp)
+ return cp + 1;
+ return name;
+}
+
+/**
+ * tomoyo_warn_log - Print warning or error message on console.
+ *
+ * @r: Pointer to "struct tomoyo_request_info".
+ * @fmt: The printf()'s format string, followed by parameters.
+ */
+void tomoyo_warn_log(struct tomoyo_request_info *r, const char *fmt, ...)
+{
+ int len = PAGE_SIZE;
+ va_list args;
+ char *buffer;
+ const struct tomoyo_profile *profile =
+ tomoyo_profile(r->domain->profile);
+ switch (r->mode) {
+ case TOMOYO_CONFIG_ENFORCING:
+ if (!profile->enforcing->enforcing_verbose)
+ return;
+ break;
+ case TOMOYO_CONFIG_PERMISSIVE:
+ if (!profile->permissive->permissive_verbose)
+ return;
+ break;
+ case TOMOYO_CONFIG_LEARNING:
+ if (!profile->learning->learning_verbose)
+ return;
+ break;
+ }
+ while (1) {
+ int len2;
+ buffer = kmalloc(len, GFP_KERNEL);
+ if (!buffer)
+ return;
+ va_start(args, fmt);
+ len2 = vsnprintf(buffer, len - 1, fmt, args);
+ va_end(args);
+ if (len2 <= len - 1) {
+ buffer[len2] = '\0';
+ break;
+ }
+ len = len2 + 1;
+ kfree(buffer);
+ }
+ printk(KERN_WARNING "%s: Access %s denied for %s\n",
+ r->mode == TOMOYO_CONFIG_ENFORCING ? "ERROR" : "WARNING",
+ buffer, tomoyo_last_word(r->domain->domainname->name));
+ kfree(buffer);
+}
+
+/**
+ * tomoyo_domain_quota_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_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 != 1)
+ return false;
+ if (!domain)
+ return true;
+ list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
+ if (ptr->is_deleted)
+ continue;
+ switch (ptr->type) {
+ u16 perm;
+ u8 i;
+ case TOMOYO_TYPE_PATH_ACL:
+ perm = container_of(ptr, struct tomoyo_path_acl,
+ head)->perm;
+ for (i = 0; i < TOMOYO_MAX_PATH_OPERATION; i++)
+ if (perm & (1 << i))
+ count++;
+ if (perm & (1 << TOMOYO_TYPE_READ_WRITE))
+ count -= 2;
+ break;
+ case TOMOYO_TYPE_PATH2_ACL:
+ perm = container_of(ptr, struct tomoyo_path2_acl,
+ head)->perm;
+ for (i = 0; i < TOMOYO_MAX_PATH2_OPERATION; i++)
+ if (perm & (1 << i))
+ count++;
+ break;
+ case TOMOYO_TYPE_EXECUTE_HANDLER:
+ case TOMOYO_TYPE_DENIED_EXECUTE_HANDLER:
+ break;
+ case TOMOYO_TYPE_PATH_NUMBER_ACL:
+ perm = container_of(ptr, struct tomoyo_path_number_acl,
+ head)->perm;
+ for (i = 0; i < TOMOYO_MAX_PATH_NUMBER_OPERATION; i++)
+ if (perm & (1 << i))
+ count++;
+ break;
+ case TOMOYO_TYPE_PATH_NUMBER3_ACL:
+ perm = container_of(ptr,
+ struct tomoyo_path_number3_acl,
+ head)->perm;
+ for (i = 0; i < TOMOYO_MAX_PATH_NUMBER3_OPERATION;
+ i++)
+ if (perm & (1 << i))
+ count++;
+ break;
+ case TOMOYO_TYPE_IP_NETWORK_ACL:
+ perm = container_of(ptr, struct tomoyo_ip_network_acl,
+ head)->perm;
+ for (i = 0; i < TOMOYO_MAX_NETWORK_OPERATION; i++)
+ if (perm & (1 << i))
+ count++;
+ break;
+ default:
+ count++;
+ }
+ }
+ if (count
+ < tomoyo_profile(domain->profile)->learning->learning_max_entry)
+ return true;
+ if (!domain->quota_warned) {
+ domain->quota_warned = true;
+ printk(KERN_WARNING "WARNING: "
+ "Domain '%s' has so many ACLs to hold. "
+ "Stopped learning mode.\n", domain->domainname->name);
+ }
+ return false;
+}
--


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