Subversion Repositories oidplus

<?php

/*

 * OIDplus 2.0

 * Copyright 2019 - 2021 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('DISABLE_PLUGIN_OIDplusPagePublicLoginGoogle', false)) {

        throw new OIDplusException(_L('This plugin was disabled by the system administrator!'));

}

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

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

}

_CheckParamExists($_GET, 'code');

_CheckParamExists($_GET, 'state');

_CheckParamExists($_COOKIE, 'csrf_token_weak');

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

        die(_L('Wrong CSRF Token'));

}

if (!function_exists('curl_init')) {

        die(_L('The "%1" PHP extension is not installed at your system. Please enable the PHP extension <code>%2</code>.','CURL','php_curl'));

}

$ch = curl_init();

if (ini_get('curl.cainfo') == '') curl_setopt($ch, CURLOPT_CAINFO, OIDplus::localpath() . '3p/certs/cacert.pem');

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=".urlencode($_GET['code'])."&".

        "redirect_uri=".urlencode(OIDplus::webpath(__DIR__,false).'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);

// Get ID token and Access token

$data = json_decode($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'];

try {

        // 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,

        //       but we do it anyway. Just to be sure!

        $verification_certs = json_decode(file_get_contents('https://www.googleapis.com/oauth2/v1/certs'), true);

        \Firebase\JWT\JWT::$leeway = 60; // leeway in seconds

        $data = (array) \Firebase\JWT\JWT::decode($id_token, $verification_certs, array('ES256', 'RS256', 'RS384', 'RS512'));

        if (($data === false) || !isset($data['iss']) || ($data['iss'] !== 'https://accounts.google.com')) {

                throw new OIDplusException(_L('JWT token could not be decoded'));

        }

        // Check if the email was verified

        $email = $data['email'];

        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

                        if (ini_get('curl.cainfo') == '') curl_setopt($ch, CURLOPT_CAINFO, OIDplus::localpath() . '3p/certs/cacert.pem');

                        $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::authUtils()->raLoginEx($email, $remember_me=false, 'Google-OAuth2');

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

                // Go back to OIDplus

                header('Location:'.OIDplus::webpath(null,false));

        }

} finally {

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

        // So we can log off again

        $ch = curl_init();

        if (ini_get('curl.cainfo') == '') curl_setopt($ch, CURLOPT_CAINFO, OIDplus::localpath() . '3p/certs/cacert.pem');

        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=".urlencode($access_token)

        );

        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

        curl_exec($ch);

        curl_close($ch);

}