Subversion Repositories oidplus

<?php

/*

 * OIDplus 2.0

 * Copyright 2020 Daniel Marschall, ViaThinkSoft

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

# More information about the OAuth2 implementation:

# - https://developers.google.com/identity/protocols/oauth2/openid-connect

require_once __DIR__ . '/../../../includes/oidplus.inc.php';

OIDplus::init(true);

set_exception_handler(array('OIDplusGui', 'html_exception_handler'));

if (!OIDplus::baseConfig()->getValue('GOOGLE_OAUTH2_ENABLED', false)) {

        throw new OIDplusException(_L('Google OAuth authentication is disabled on this system.'));

}

if (!isset($_GET['code'])) die();

if (!isset($_GET['state'])) die();

if ($_GET['state'] != $_COOKIE['csrf_token']) {

        die('Invalid CSRF token');

}

if (!function_exists('curl_exec')) {

        die(_L('The "CURL" PHP extension is not installed at your system. Please enable the PHP extension <code>php_curl</code>.'));

}

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL,"https://oauth2.googleapis.com/token");

curl_setopt($ch, CURLOPT_POST, 1);

curl_setopt($ch, CURLOPT_POSTFIELDS,

        "grant_type=authorization_code&".

        "code=".$_GET['code']."&".

        "redirect_uri=".urlencode(OIDplus::getSystemUrl(false).OIDplus::webpath(__DIR__).'oauth.php')."&".

        "client_id=".urlencode(OIDplus::baseConfig()->getValue('GOOGLE_OAUTH2_CLIENT_ID'))."&".

        "client_secret=".urlencode(OIDplus::baseConfig()->getValue('GOOGLE_OAUTH2_CLIENT_SECRET'))

);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$cont = curl_exec($ch);

curl_close($ch);

// Decode JWT "id_token"

// see https://medium.com/@darutk/understanding-id-token-5f83f50fa02e

// Note: We do not need to verify the signature because the token comes directly from Google

$data = json_decode($cont,true);

if (isset($data['error'])) {

        throw new OIDplusException(_L('Error receiving the authentication token from %1: %2','Google',$data['error'].' '.$data['error_description']));

}

$id_token = $data['id_token'];

$access_token = $data['access_token'];

list($header,$payload,$signature) = explode('.', $id_token);

$data = json_decode(base64_decode($payload),true);

$email = $data['email'];

// Check if the email was verified

if ($data['email_verified'] != 'true') {

        throw new OIDplusException(_L('The email address %1 was not verified. Please verify it first!',$email));

}

// Everything's done! Now login and/or create account

if (!empty($email)) {

        $ra = new OIDplusRA($email);

        if (!$ra->existing()) {

                $ra->register_ra(null); // create a user account without password

                // Query user infos

                $ch = curl_init('https://www.googleapis.com/oauth2/v3/userinfo'); // Initialise cURL

                $data_string = '';

                curl_setopt($ch, CURLOPT_HTTPHEADER, array(

                        'Content-Length: ' . strlen($data_string),

                        "Authorization: Bearer ".$access_token

                ));

                curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);

                curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

                curl_setopt($ch, CURLOPT_POST, 1);

                curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);

                $result = curl_exec($ch);

                curl_close($ch);

                $data = json_decode($result,true);

                $personal_name = $data['name']; // = given_name + " " + family_name

                OIDplus::db()->query("update ###ra set ra_name = ?, personal_name = ? where email = ?", array($personal_name, $personal_name, $email));

                OIDplus::logger()->log("[INFO]RA($email)!", "RA '$email' was created because of successful Google OAuth2 login");

        }

        OIDplus::logger()->log("[OK]RA($email)!", "RA '$email' logged in via Google OAuth2");

        OIDplus::authUtils()::raLogin($email);

        OIDplus::db()->query("UPDATE ###ra set last_login = ".OIDplus::db()->sqlDate()." where email = ?", array($email));

        // Go back to OIDplus

        header('Location:'.OIDplus::getSystemUrl(false));

}

// We now have the data of the person that wanted to log in

// So we can log off again

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL,"https://oauth2.googleapis.com/revoke");

curl_setopt($ch, CURLOPT_POST, 1);

curl_setopt($ch, CURLOPT_POSTFIELDS,

        "client_id=".urlencode(OIDplus::baseConfig()->getValue('GOOGLE_OAUTH2_CLIENT_ID'))."&".

        "client_secret=".urlencode(OIDplus::baseConfig()->getValue('GOOGLE_OAUTH2_CLIENT_SECRET'))."&".

        "token_type_hint=access_token&".

        "token=".$access_token

);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

curl_exec($ch);

curl_close($ch);