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<?php |
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declare(strict_types=1); |
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/** |
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* Sasl library. |
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* |
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* Copyright (c) 2002-2003 Richard Heyes, |
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* 2014-2025 Fabian Grutschus |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* o Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* o Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution.| |
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* o The names of the authors may not be used to endorse or promote |
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* products derived from this software without specific prior written |
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* permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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* @author Richard Heyes <[email protected]> |
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*/ |
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namespace Fabiang\SASL\Authentication; |
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use Fabiang\SASL\Options; |
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/** |
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* Common functionality to SASL mechanisms |
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* |
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* @author Richard Heyes <[email protected]> |
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*/ |
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abstract class AbstractAuthentication |
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{ |
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/** |
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* Use random devices. |
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*/ |
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public static bool $useDevRandom = true; |
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private static array $randomDevices = ['/dev/urandom', '/dev/random']; |
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/** |
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* Options object. |
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*/ |
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protected Options $options; |
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public function __construct(Options $options) |
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{ |
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$this->options = $options; |
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} |
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/** |
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* Get options object. |
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*/ |
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public function getOptions(): Options |
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{ |
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return $this->options; |
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} |
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/** |
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* Creates the client nonce for the response |
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* |
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* @return string The cnonce value |
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*/ |
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protected function generateCnonce(): string |
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{ |
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foreach (self::$randomDevices as $file) { |
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if (true === static::$useDevRandom && is_readable($file)) { |
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return base64_encode(file_get_contents($file, false, null, 0, 32)); |
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} |
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} |
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$cnonce = ''; |
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for ($i = 0; $i < 32; $i++) { |
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$cnonce .= chr(mt_rand(0, 255)); |
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} |
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return base64_encode($cnonce); |
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} |
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/** |
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* Generate downgrade protection string |
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*/ |
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protected function generateDowngradeProtectionVerification(): string |
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{ |
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$downgradeProtectionOptions = $this->options->getDowngradeProtection(); |
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$allowedMechanisms = $downgradeProtectionOptions->getAllowedMechanisms(); |
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$allowedChannelBindings = $downgradeProtectionOptions->getAllowedChannelBindings(); |
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if (count($allowedMechanisms) === 0 && count($allowedChannelBindings) === 0) { |
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return ''; |
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} |
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usort($allowedMechanisms, [$this, 'sortOctetCollation']); |
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usort($allowedChannelBindings, [$this, 'sortOctetCollation']); |
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$protect = implode(',', $allowedMechanisms); |
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if (count($allowedChannelBindings) > 0) { |
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$protect .= '|' . implode(',', $allowedChannelBindings); |
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} |
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return $protect; |
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} |
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/** |
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* @link https://datatracker.ietf.org/doc/html/rfc4790#page-22 |
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*/ |
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private function sortOctetCollation(string $a, string $b): int |
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{ |
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if ($a == $b) { |
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return 0; |
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} |
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return ($a < $b) ? -1 : 1; |
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} |
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} |
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fabiang /
sasl
