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<?php
namespace SimpleSAML\Module\authYubiKey\Auth\Process;
/*
* Copyright (C) 2009 Simon Josefsson <simon@yubico.com>.
*
* This file is part of SimpleSAMLphp
*
* SimpleSAMLphp is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 3 of
* the License, or (at your option) any later version.
*
* SimpleSAMLphp 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License License along with GNU SASL Library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
/**
* A processing filter to replace the 'otp' attribute with an attribute
* 'yubiPrefix' that contains the static YubiKey prefix.
*
* Before:
* otp=ekhgjhbctrgnubeeklijcibbgjnbtjlffdnjbhjluvur
*
* After:
* otp undefined
* yubiPrefix=ekhgjhbctrgn
*
* You use it by adding it as an authentication filter in config.php:
*
* 'authproc.idp' => array(
* ...
* 90 => 'authYubiKey:OTP2YubiPrefix',
* ...
* );
*
*/
class OTP2YubiPrefix extends \SimpleSAML\Auth\ProcessingFilter
{
/**
* Filter out YubiKey 'otp' attribute and replace it with
* a 'yubiPrefix' attribute that leaves out the dynamic part.
*
* @param array &$state The state we should update.
* @return void
*/
public function process(&$state)
{
assert(is_array($state));
assert(array_key_exists('Attributes', $state));
$attributes = $state['Attributes'];
\SimpleSAML\Logger::debug('OTP2YubiPrefix: enter with attributes: '.implode(',', array_keys($attributes)));
$otps = $attributes['otp'];
$otp = $otps['0'];
$token_size = 32;
$identity = substr($otp, 0, strlen($otp) - $token_size);
$attributes['yubiPrefix'] = [$identity];
\SimpleSAML\Logger::info(
'OTP2YubiPrefix: otp: '.$otp.' identity: '.$identity.' (otp keys: '.implode(',', array_keys($otps)).')'
);
unset($attributes['otp']);
\SimpleSAML\Logger::debug('OTP2YubiPrefix: leaving with attributes: '.implode(',', array_keys($attributes)));
}
}
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