// SPDX-License-Identifier: GPL-2.0
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/*
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* security/tomoyo/util.c
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*
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* Copyright (C) 2005-2011 NTT DATA CORPORATION
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*/
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#include <linux/slab.h>
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#include <linux/rculist.h>
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#include "common.h"
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/* Lock for protecting policy. */
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DEFINE_MUTEX(tomoyo_policy_lock);
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/* Has /sbin/init started? */
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bool tomoyo_policy_loaded;
|
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/*
|
* Mapping table from "enum tomoyo_mac_index" to
|
* "enum tomoyo_mac_category_index".
|
*/
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const u8 tomoyo_index2category[TOMOYO_MAX_MAC_INDEX] = {
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/* CONFIG::file group */
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[TOMOYO_MAC_FILE_EXECUTE] = TOMOYO_MAC_CATEGORY_FILE,
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[TOMOYO_MAC_FILE_OPEN] = TOMOYO_MAC_CATEGORY_FILE,
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[TOMOYO_MAC_FILE_CREATE] = TOMOYO_MAC_CATEGORY_FILE,
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[TOMOYO_MAC_FILE_UNLINK] = TOMOYO_MAC_CATEGORY_FILE,
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[TOMOYO_MAC_FILE_GETATTR] = TOMOYO_MAC_CATEGORY_FILE,
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[TOMOYO_MAC_FILE_MKDIR] = TOMOYO_MAC_CATEGORY_FILE,
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[TOMOYO_MAC_FILE_RMDIR] = TOMOYO_MAC_CATEGORY_FILE,
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[TOMOYO_MAC_FILE_MKFIFO] = TOMOYO_MAC_CATEGORY_FILE,
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[TOMOYO_MAC_FILE_MKSOCK] = TOMOYO_MAC_CATEGORY_FILE,
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[TOMOYO_MAC_FILE_TRUNCATE] = TOMOYO_MAC_CATEGORY_FILE,
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[TOMOYO_MAC_FILE_SYMLINK] = TOMOYO_MAC_CATEGORY_FILE,
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[TOMOYO_MAC_FILE_MKBLOCK] = TOMOYO_MAC_CATEGORY_FILE,
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[TOMOYO_MAC_FILE_MKCHAR] = TOMOYO_MAC_CATEGORY_FILE,
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[TOMOYO_MAC_FILE_LINK] = TOMOYO_MAC_CATEGORY_FILE,
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[TOMOYO_MAC_FILE_RENAME] = TOMOYO_MAC_CATEGORY_FILE,
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[TOMOYO_MAC_FILE_CHMOD] = TOMOYO_MAC_CATEGORY_FILE,
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[TOMOYO_MAC_FILE_CHOWN] = TOMOYO_MAC_CATEGORY_FILE,
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[TOMOYO_MAC_FILE_CHGRP] = TOMOYO_MAC_CATEGORY_FILE,
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[TOMOYO_MAC_FILE_IOCTL] = TOMOYO_MAC_CATEGORY_FILE,
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[TOMOYO_MAC_FILE_CHROOT] = TOMOYO_MAC_CATEGORY_FILE,
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[TOMOYO_MAC_FILE_MOUNT] = TOMOYO_MAC_CATEGORY_FILE,
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[TOMOYO_MAC_FILE_UMOUNT] = TOMOYO_MAC_CATEGORY_FILE,
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[TOMOYO_MAC_FILE_PIVOT_ROOT] = TOMOYO_MAC_CATEGORY_FILE,
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/* CONFIG::network group */
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[TOMOYO_MAC_NETWORK_INET_STREAM_BIND] =
|
TOMOYO_MAC_CATEGORY_NETWORK,
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[TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN] =
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TOMOYO_MAC_CATEGORY_NETWORK,
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[TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT] =
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TOMOYO_MAC_CATEGORY_NETWORK,
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[TOMOYO_MAC_NETWORK_INET_DGRAM_BIND] =
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TOMOYO_MAC_CATEGORY_NETWORK,
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[TOMOYO_MAC_NETWORK_INET_DGRAM_SEND] =
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TOMOYO_MAC_CATEGORY_NETWORK,
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[TOMOYO_MAC_NETWORK_INET_RAW_BIND] =
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TOMOYO_MAC_CATEGORY_NETWORK,
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[TOMOYO_MAC_NETWORK_INET_RAW_SEND] =
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TOMOYO_MAC_CATEGORY_NETWORK,
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[TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND] =
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TOMOYO_MAC_CATEGORY_NETWORK,
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[TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN] =
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TOMOYO_MAC_CATEGORY_NETWORK,
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[TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT] =
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TOMOYO_MAC_CATEGORY_NETWORK,
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[TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND] =
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TOMOYO_MAC_CATEGORY_NETWORK,
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[TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND] =
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TOMOYO_MAC_CATEGORY_NETWORK,
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[TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND] =
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TOMOYO_MAC_CATEGORY_NETWORK,
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[TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN] =
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TOMOYO_MAC_CATEGORY_NETWORK,
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[TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT] =
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TOMOYO_MAC_CATEGORY_NETWORK,
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/* CONFIG::misc group */
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[TOMOYO_MAC_ENVIRON] = TOMOYO_MAC_CATEGORY_MISC,
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};
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/**
|
* tomoyo_convert_time - Convert time_t to YYYY/MM/DD hh/mm/ss.
|
*
|
* @time: Seconds since 1970/01/01 00:00:00.
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* @stamp: Pointer to "struct tomoyo_time".
|
*
|
* Returns nothing.
|
*/
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void tomoyo_convert_time(time64_t time64, struct tomoyo_time *stamp)
|
{
|
struct tm tm;
|
|
time64_to_tm(time64, 0, &tm);
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stamp->sec = tm.tm_sec;
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stamp->min = tm.tm_min;
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stamp->hour = tm.tm_hour;
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stamp->day = tm.tm_mday;
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stamp->month = tm.tm_mon + 1;
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stamp->year = tm.tm_year + 1900;
|
}
|
|
/**
|
* tomoyo_permstr - Find permission keywords.
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*
|
* @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)
|
{
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char *pos = param->data;
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char *del = strchr(pos, ' ');
|
|
if (del)
|
*del++ = '\0';
|
else
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del = pos + strlen(pos);
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param->data = del;
|
return pos;
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}
|
|
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;
|
}
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/**
|
* 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.
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*
|
* @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)
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snprintf(buffer, buffer_len, "%lu", value);
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else if (type == TOMOYO_VALUE_TYPE_OCTAL)
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snprintf(buffer, buffer_len, "0%lo", value);
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else if (type == TOMOYO_VALUE_TYPE_HEXADECIMAL)
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snprintf(buffer, buffer_len, "0x%lX", value);
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else
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snprintf(buffer, buffer_len, "type(%u)", type);
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}
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|
/**
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* tomoyo_parse_name_union - Parse a tomoyo_name_union.
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*
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* @param: Pointer to "struct tomoyo_acl_param".
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* @ptr: Pointer to "struct tomoyo_name_union".
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*
|
* Returns true on success, false otherwise.
|
*/
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bool tomoyo_parse_name_union(struct tomoyo_acl_param *param,
|
struct tomoyo_name_union *ptr)
|
{
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char *filename;
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|
if (param->data[0] == '@') {
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param->data++;
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ptr->group = tomoyo_get_group(param, TOMOYO_PATH_GROUP);
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return ptr->group != NULL;
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}
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filename = tomoyo_read_token(param);
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if (!tomoyo_correct_word(filename))
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return false;
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ptr->filename = tomoyo_get_name(filename);
|
return ptr->filename != NULL;
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}
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|
/**
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* tomoyo_parse_number_union - Parse a tomoyo_number_union.
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*
|
* @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)
|
{
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char *data;
|
u8 type;
|
unsigned long v;
|
|
memset(ptr, 0, sizeof(*ptr));
|
if (param->data[0] == '@') {
|
param->data++;
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ptr->group = tomoyo_get_group(param, TOMOYO_NUMBER_GROUP);
|
return ptr->group != NULL;
|
}
|
data = tomoyo_read_token(param);
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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;
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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)
|
{
|
const char *const start = string;
|
bool in_repetition = false;
|
unsigned char c;
|
unsigned char d;
|
unsigned char e;
|
|
if (!len)
|
goto out;
|
while (len--) {
|
c = *string++;
|
if (c == '\\') {
|
if (!len--)
|
goto out;
|
c = *string++;
|
switch (c) {
|
case '\\': /* "\\" */
|
continue;
|
case '$': /* "\$" */
|
case '+': /* "\+" */
|
case '?': /* "\?" */
|
case '*': /* "\*" */
|
case '@': /* "\@" */
|
case 'x': /* "\x" */
|
case 'X': /* "\X" */
|
case 'a': /* "\a" */
|
case 'A': /* "\A" */
|
case '-': /* "\-" */
|
continue;
|
case '{': /* "/\{" */
|
if (string - 3 < start || *(string - 3) != '/')
|
break;
|
in_repetition = true;
|
continue;
|
case '}': /* "\}/" */
|
if (*string != '/')
|
break;
|
if (!in_repetition)
|
break;
|
in_repetition = false;
|
continue;
|
case '0': /* "\ooo" */
|
case '1':
|
case '2':
|
case '3':
|
if (!len-- || !len--)
|
break;
|
d = *string++;
|
e = *string++;
|
if (d < '0' || d > '7' || e < '0' || e > '7')
|
break;
|
c = tomoyo_make_byte(c, d, e);
|
if (c <= ' ' || c >= 127)
|
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;
|
}
|
