ccd423225f
In PHP 8, but not in PHP 7.4, every class with a __toString() function implicitly implements the Stringable interface. Therefore, the behavior of checks like "instanceof Stringable" differs between these PHP versions when such classes are involved. Make every such class implement the interface so that the behavior will be consistent. The PHP 7.4 fallback for the Stringable interface is provided by symfony/polyfill-php80. Change-Id: I3f0330c2555c7d3bf99b654ed3c0b0303e257ea1
136 lines
3.3 KiB
PHP
136 lines
3.3 KiB
PHP
<?php
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/**
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* MediaWiki session token
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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* @ingroup Session
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*/
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namespace MediaWiki\Session;
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use Stringable;
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/**
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* Value object representing a CSRF token
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*
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* @ingroup Session
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* @since 1.27
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*/
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class Token implements Stringable {
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/** CSRF token suffix. Plus and terminal backslash are included to stop
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* editing from certain broken proxies.
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*/
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public const SUFFIX = '+\\';
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/** @var string */
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private $secret;
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/** @var string */
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private $salt;
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/** @var bool */
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private $new;
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/**
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* @param string $secret Token secret
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* @param string $salt Token salt
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* @param bool $new Whether the secret was newly-created
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*/
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public function __construct( $secret, $salt, $new = false ) {
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$this->secret = $secret;
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$this->salt = $salt;
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$this->new = $new;
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}
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/**
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* Decode the timestamp from a token string
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*
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* Does not validate the token beyond the syntactic checks necessary to
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* be able to extract the timestamp.
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*
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* @param string $token
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* @return int|null
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*/
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public static function getTimestamp( $token ) {
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$suffixLen = strlen( self::SUFFIX );
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$len = strlen( $token );
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if ( $len <= 32 + $suffixLen ||
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substr( $token, -$suffixLen ) !== self::SUFFIX ||
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strspn( $token, '0123456789abcdef' ) + $suffixLen !== $len
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) {
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return null;
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}
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return hexdec( substr( $token, 32, -$suffixLen ) );
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}
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/**
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* Get the string representation of the token at a timestamp
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* @param int $timestamp
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* @return string
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*/
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protected function toStringAtTimestamp( $timestamp ) {
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return hash_hmac( 'md5', $timestamp . $this->salt, $this->secret, false ) .
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dechex( $timestamp ) .
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self::SUFFIX;
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}
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/**
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* Get the string representation of the token
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* @return string
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*/
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public function toString() {
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return $this->toStringAtTimestamp( (int)wfTimestamp( TS_UNIX ) );
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}
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public function __toString() {
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return $this->toString();
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}
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/**
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* Test if the token-string matches this token
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* @param string|null $userToken
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* @param int|null $maxAge Return false if $userToken is older than this many seconds
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* @return bool
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*/
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public function match( $userToken, $maxAge = null ) {
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if ( !$userToken ) {
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return false;
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}
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$timestamp = self::getTimestamp( $userToken );
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if ( $timestamp === null ) {
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return false;
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}
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if ( $maxAge !== null && $timestamp < (int)wfTimestamp( TS_UNIX ) - $maxAge ) {
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// Expired token
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return false;
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}
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$sessionToken = $this->toStringAtTimestamp( $timestamp );
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return hash_equals( $sessionToken, $userToken );
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}
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/**
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* Indicate whether this token was just created
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* @return bool
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*/
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public function wasNew() {
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return $this->new;
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}
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}
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