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<?php
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/*
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 * OIDplus 2.0
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 * Copyright 2019 - 2023 Daniel Marschall, ViaThinkSoft
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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 ViaThinkSoft\OIDplus;
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// phpcs:disable PSR1.Files.SideEffects
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\defined('INSIDE_OIDPLUS') or die;
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// phpcs:enable PSR1.Files.SideEffects
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class OIDplusAuthPluginBCrypt extends OIDplusAuthPlugin {
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        public function init($html=true) {
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                OIDplus::config()->prepareConfigKey('ra_bcrypt_cost', 'How complex should the BCrypt hash of RA passwords be? (Only for plugin A3_bcrypt; values 4-31, default 10)', 10, OIDplusConfig::PROTECTION_EDITABLE, function($value) {
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                        if (empty($value) || !is_int($value) || ($value<4) || ($value>31)) {
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                                throw new OIDplusException(_L('Invalid value for "cost" (must be 4-31, default 10).'));
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                        }
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                });
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        }
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        public function verify(OIDplusRAAuthInfo $authInfo, $check_password) {
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                $authKey = $authInfo->getAuthKey();
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                $salt = $authInfo->getSalt();
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                @list($s_authmethod, $s_authkey) = explode('#', $authKey, 2);
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                if ($s_authmethod == 'A3') {
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                        // A3#$2a$10$N9qo8uLOickgx2ZMRZoMyeIjZAgcfl7p92ldGxad68LJZdL17lhWy
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                        //    \__/\/ \____________________/\_____________________________/
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                        //    Alg Cost   Salt (128 bit)             Hash
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                        if ($salt != '') {
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                                throw new OIDplusException(_L('This function does not accept a salt'));
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                        }
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                        return password_verify($check_password, $s_authkey);
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                } else {
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                        // Invalid auth code
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                        return false;
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                }
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        }
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        public function generate($password): OIDplusRAAuthInfo {
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                $s_salt = ''; // BCrypt automatically generates a salt
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                $cost = OIDplus::config()->getValue('ra_bcrypt_cost', 10);
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                $calc_authkey = 'A3#'.password_hash($password, PASSWORD_BCRYPT, array("cost" => $cost));
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                return new OIDplusRAAuthInfo($s_salt, $calc_authkey);
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        }
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}