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<?php
/**
* Implements the LayeredParameterizedPassword class for the MediaWiki software.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
/**
* This password hash type layers one or more parameterized password types
* on top of each other.
*
* The underlying types must be parameterized. This wrapping type accumulates
* all the parameters and arguments from each hash and then passes the hash of
* the last layer as the password for the next layer.
*
* @since 1.24
*/
class LayeredParameterizedPassword extends ParameterizedPassword {
protected function getDelimiter() {
return '!';
}
protected function getDefaultParams() {
$params = array();
foreach ( $this->config['types'] as $type ) {
$passObj = $this->factory->newFromType( $type );
if ( !$passObj instanceof ParameterizedPassword ) {
throw new MWException( 'Underlying type must be a parameterized password.' );
} elseif ( $passObj->getDelimiter() === $this->getDelimiter() ) {
throw new MWException( 'Underlying type cannot use same delimiter as encapsulating type.' );
}
$params[] = implode( $passObj->getDelimiter(), $passObj->getDefaultParams() );
}
return $params;
}
public function crypt( $password ) {
$lastHash = $password;
foreach ( $this->config['types'] as $i => $type ) {
// Construct pseudo-hash based on params and arguments
/** @var ParameterizedPassword $passObj */
$passObj = $this->factory->newFromType( $type );
$params = '';
$args = '';
if ( $this->params[$i] !== '' ) {
$params = $this->params[$i] . $passObj->getDelimiter();
}
if ( isset( $this->args[$i] ) && $this->args[$i] !== '' ) {
$args = $this->args[$i] . $passObj->getDelimiter();
}
$existingHash = ":$type:" . $params . $args . $this->hash;
// Hash the last hash with the next type in the layer
$passObj = $this->factory->newFromCiphertext( $existingHash );
$passObj->crypt( $lastHash );
// Move over the params and args
$this->params[$i] = implode( $passObj->getDelimiter(), $passObj->params );
$this->args[$i] = implode( $passObj->getDelimiter(), $passObj->args );
$lastHash = $passObj->hash;
}
$this->hash = $lastHash;
}
/**
* Finish the hashing of a partially hashed layered hash
*
* Given a password hash that is hashed using the first layer of this object's
* configuration, perform the remaining layers of password hashing in order to
* get an updated hash with all the layers.
*
* @param ParameterizedPassword $passObj Password hash of the first layer
*
* @throws MWException If the first parameter is not of the correct type
*/
public function partialCrypt( ParameterizedPassword $passObj ) {
$type = $passObj->config['type'];
if ( $type !== $this->config['types'][0] ) {
throw new MWException( 'Only a hash in the first layer can be finished.' );
}
// Gather info from the existing hash
$this->params[0] = implode( $passObj->getDelimiter(), $passObj->params );
$this->args[0] = implode( $passObj->getDelimiter(), $passObj->args );
$lastHash = $passObj->hash;
// Layer the remaining types
foreach ( $this->config['types'] as $i => $type ) {
if ( $i == 0 ) {
continue;
};
// Construct pseudo-hash based on params and arguments
/** @var ParameterizedPassword $passObj */
$passObj = $this->factory->newFromType( $type );
$params = '';
$args = '';
if ( $this->params[$i] !== '' ) {
$params = $this->params[$i] . $passObj->getDelimiter();
}
if ( isset( $this->args[$i] ) && $this->args[$i] !== '' ) {
$args = $this->args[$i] . $passObj->getDelimiter();
}
$existingHash = ":$type:" . $params . $args . $this->hash;
// Hash the last hash with the next type in the layer
$passObj = $this->factory->newFromCiphertext( $existingHash );
$passObj->crypt( $lastHash );
// Move over the params and args
$this->params[$i] = implode( $passObj->getDelimiter(), $passObj->params );
$this->args[$i] = implode( $passObj->getDelimiter(), $passObj->args );
$lastHash = $passObj->hash;
}
$this->hash = $lastHash;
}
}
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