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<?php
/**
* Implements the EncryptedPassword 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
*/
declare( strict_types = 1 );
/**
* Helper class for passwords that use another password hash underneath it
* and encrypts that hash with a configured secret.
*
* @since 1.24
*/
class EncryptedPassword extends ParameterizedPassword {
protected function getDelimiter() : string {
return ':';
}
protected function getDefaultParams() : array {
return [
'cipher' => $this->config['cipher'],
'secret' => count( $this->config['secrets'] ) - 1
];
}
public function crypt( string $password ) : void {
$secret = $this->config['secrets'][$this->params['secret']];
// Clear error string
while ( openssl_error_string() !== false );
if ( $this->hash ) {
$decrypted = openssl_decrypt(
$this->hash, $this->params['cipher'],
$secret, 0, base64_decode( $this->args[0] ) );
if ( $decrypted === false ) {
throw new PasswordError( 'Error decrypting password: ' . openssl_error_string() );
}
$underlyingPassword = $this->factory->newFromCiphertext( $decrypted );
} else {
$underlyingPassword = $this->factory->newFromType( $this->config['underlying'] );
}
$underlyingPassword->crypt( $password );
if ( count( $this->args ) ) {
$iv = base64_decode( $this->args[0] );
} else {
$iv = random_bytes( openssl_cipher_iv_length( $this->params['cipher'] ) );
}
$this->hash = openssl_encrypt(
$underlyingPassword->toString(), $this->params['cipher'], $secret, 0, $iv );
if ( $this->hash === false ) {
throw new PasswordError( 'Error encrypting password: ' . openssl_error_string() );
}
$this->args = [ base64_encode( $iv ) ];
}
/**
* Updates the underlying hash by encrypting it with the newest secret.
*
* @throws MWException If the configuration is not valid
* @return bool True if the password was updated
*/
public function update() : bool {
if ( count( $this->args ) != 1 || $this->params == $this->getDefaultParams() ) {
// Hash does not need updating
return false;
}
// Clear error string
while ( openssl_error_string() !== false );
// Decrypt the underlying hash
$underlyingHash = openssl_decrypt(
$this->hash,
$this->params['cipher'],
$this->config['secrets'][$this->params['secret']],
0,
base64_decode( $this->args[0] )
);
if ( $underlyingHash === false ) {
throw new PasswordError( 'Error decrypting password: ' . openssl_error_string() );
}
// Reset the params
$this->params = $this->getDefaultParams();
// Check the key size with the new params
$iv = random_bytes( openssl_cipher_iv_length( $this->params['cipher'] ) );
$this->hash = openssl_encrypt(
$underlyingHash,
$this->params['cipher'],
$this->config['secrets'][$this->params['secret']],
0,
$iv
);
if ( $this->hash === false ) {
throw new PasswordError( 'Error encrypting password: ' . openssl_error_string() );
}
$this->args = [ base64_encode( $iv ) ];
return true;
}
}
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