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<?php |
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/** |
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* Copyright 2015 François Kooman <[email protected]>. |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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namespace fkooman\VPN\Server; |
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use fkooman\Rest\Plugin\Authentication\Bearer\ValidatorInterface; |
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use fkooman\Rest\Plugin\Authentication\Bearer\TokenInfo; |
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class BearerValidator implements ValidatorInterface |
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{ |
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/** @var array */ |
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private $bearerTokens; |
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public function __construct(array $bearerTokens) |
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{ |
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$this->bearerTokens = $bearerTokens; |
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} |
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/** |
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* @return TokenInfo |
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*/ |
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public function validate($bearerToken) |
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{ |
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foreach ($this->bearerTokens as $t) { |
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if (self::hashEquals($t, $bearerToken)) { |
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return new TokenInfo( |
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['active' => true] |
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); |
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} |
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} |
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return new TokenInfo( |
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['active' => false] |
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); |
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} |
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/** |
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* Wrapper to compare two hashes in a timing safe way. |
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* |
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* @param string $safe the string we control |
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* @param string $user the string the user controls |
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* |
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* @return bool whether or not the two strings are identical |
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*/ |
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public static function hashEquals($safe, $user) |
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{ |
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// PHP >= 5.6.0 has "hash_equals" |
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if (function_exists('hash_equals')) { |
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return hash_equals($safe, $user); |
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} |
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return self::timingSafeEquals($safe, $user); |
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} |
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/** |
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* A timing safe equals comparison. |
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* |
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* @param string $safe The internal (safe) value to be checked |
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* @param string $user The user submitted (unsafe) value |
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* |
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* @return bool True if the two strings are identical. |
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* |
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* @see http://blog.ircmaxell.com/2014/11/its-all-about-time.html |
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*/ |
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public static function timingSafeEquals($safe, $user) |
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{ |
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$safeLen = strlen($safe); |
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$userLen = strlen($user); |
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if ($userLen != $safeLen) { |
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return false; |
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} |
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$result = 0; |
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for ($i = 0; $i < $userLen; ++$i) { |
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$result |= (ord($safe[$i]) ^ ord($user[$i])); |
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} |
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// They are only identical strings if $result is exactly 0... |
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return $result === 0; |
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} |
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} |
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eduVPN /
vpn-server-api
