google_oauthcallback.php

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<?php
/* Copyright (C) 2022       Laurent Destailleur  <eldy@users.sourceforge.net>
 * Copyright (C) 2015       Frederic France      <frederic.france@free.fr>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 */
 
// This page is used as callback for token generation of an OAUTH request.
// This page can also be used to make the process to login and get token as described here:
// https://developers.google.com/identity/protocols/oauth2/openid-connect#server-flow
 
// Force keyforprovider
$forlogin = 0;
if (!empty($_GET['state']) && preg_match('/^forlogin-/', $_GET['state'])) {
  $forlogin = 1;
  $_GET['keyforprovider'] = 'Login';
}
 
if (!defined('NOLOGIN') && $forlogin) {
  define("NOLOGIN", 1); // This means this output page does not require to be logged.
}
 
// Load Dolibarr environment
require '../../../main.inc.php';
require_once DOL_DOCUMENT_ROOT.'/includes/OAuth/bootstrap.php';
use OAuth\Common\Storage\DoliStorage;
use OAuth\Common\Consumer\Credentials;
use OAuth\OAuth2\Service\Google;
 
// Define $urlwithroot
global $dolibarr_main_url_root;
$urlwithouturlroot = preg_replace('/'.preg_quote(DOL_URL_ROOT, '/').'$/i', '', trim($dolibarr_main_url_root));
$urlwithroot = $urlwithouturlroot.DOL_URL_ROOT; // This is to use external domain name found into config file
//$urlwithroot=DOL_MAIN_URL_ROOT;         // This is to use same domain name than current
 
$langs->load("oauth");
 
$action = GETPOST('action', 'aZ09');
$backtourl = GETPOST('backtourl', 'alpha');
$keyforprovider = GETPOST('keyforprovider', 'aZ09');
if (!GETPOSTISSET('keyforprovider') && !empty($_SESSION["oauthkeyforproviderbeforeoauthjump"]) && (GETPOST('code') || $action == 'delete')) {
  // If we are coming from the Oauth page
  $keyforprovider = $_SESSION["oauthkeyforproviderbeforeoauthjump"];
}
 
 
$uriFactory = new \OAuth\Common\Http\Uri\UriFactory();
//$currentUri = $uriFactory->createFromSuperGlobalArray($_SERVER);
//$currentUri->setQuery('');
$currentUri = $uriFactory->createFromAbsolute($urlwithroot.'/core/modules/oauth/google_oauthcallback.php');
 
 
$serviceFactory = new \OAuth\ServiceFactory();
$httpClient = new \OAuth\Common\Http\Client\CurlClient();
// TODO Set options for proxy and timeout
// $params=array('CURLXXX'=>value, ...)
//$httpClient->setCurlParameters($params);
$serviceFactory->setHttpClient($httpClient);
 
// Setup the credentials for the requests
$keyforparamid = 'OAUTH_GOOGLE'.($keyforprovider ? '-'.$keyforprovider : '').'_ID';
$keyforparamsecret = 'OAUTH_GOOGLE'.($keyforprovider ? '-'.$keyforprovider : '').'_SECRET';
$credentials = new Credentials(
  getDolGlobalString($keyforparamid),
  getDolGlobalString($keyforparamsecret),
  $currentUri->getAbsoluteUri()
);
 
$state = GETPOST('state');
$statewithscopeonly = '';
$statewithanticsrfonly = '';
 
$requestedpermissionsarray = array();
if ($state) {
  // 'state' parameter is standard to store a hash value and can be used to retrieve some parameters back
  $statewithscopeonly = preg_replace('/\-.*$/', '', preg_replace('/^forlogin-/', '', $state));
  $requestedpermissionsarray = explode(',', $statewithscopeonly); // Example: 'userinfo_email,userinfo_profile,openid,email,profile,cloud_print'.
  $statewithanticsrfonly = preg_replace('/^.*\-/', '', $state);
}
 
// Add a test to check that the state parameter is provided into URL when we make the first call to ask the redirect or when we receive the callback
// but not when callback was ok and we recall the page
if ($action != 'delete' && !GETPOST('afteroauthloginreturn', 'int') && (empty($statewithscopeonly) || empty($requestedpermissionsarray))) {
  dol_syslog("state or statewithscopeonly and/or requestedpermissionsarray are empty");
  setEventMessages($langs->trans('ScopeUndefined'), null, 'errors');
  if (empty($backtourl)) {
    $backtourl = DOL_URL_ROOT.'/';
  }
  header('Location: '.$backtourl);
  exit();
}
 
//var_dump($requestedpermissionsarray);exit;
 
 
// Dolibarr storage
$storage = new DoliStorage($db, $conf, $keyforprovider);
 
// Instantiate the Api service using the credentials, http client and storage mechanism for the token
// $requestedpermissionsarray contains list of scopes.
// Conversion into URL is done by Reflection on constant with name SCOPE_scope_in_uppercase
$apiService = $serviceFactory->createService('Google', $credentials, $storage, $requestedpermissionsarray);
 
// access type needed to have oauth provider refreshing token
// also note that a refresh token is sent only after a prompt
$apiService->setAccessType('offline');
 
 
if (!getDolGlobalString($keyforparamid)) {
  accessforbidden('Setup of service '.$keyforparamid.' is not complete. Customer ID is missing');
}
if (!getDolGlobalString($keyforparamsecret)) {
  accessforbidden('Setup of service '.$keyforparamid.' is not complete. Secret key is missing');
}
 
 
/*
 * Actions
 */
 
if ($action == 'delete') {
  $storage->clearToken('Google');
 
  setEventMessages($langs->trans('TokenDeleted'), null, 'mesgs');
 
  header('Location: '.$backtourl);
  exit();
}
 
if (!GETPOST('code')) {
  dol_syslog("Page is called without code parameter defined");
 
  // If we enter this page without 'code' parameter, it means we click on the link from login page and we want to get the redirect
  // to the OAuth provider login page.
  $_SESSION["backtourlsavedbeforeoauthjump"] = $backtourl;
  $_SESSION["oauthkeyforproviderbeforeoauthjump"] = $keyforprovider;
  $_SESSION['oauthstateanticsrf'] = $state;
 
  // Save more data into session
  // Not required. All data are saved into $_SESSION['datafromloginform'] when form is posted with a click on Login with
  // Google with param actionlogin=login and beforeoauthloginredirect=1, by the functions_googleoauth.php.
  /*
  if (!empty($_POST["tz"])) {
    $_SESSION["tz"] = $_POST["tz"];
  }
  if (!empty($_POST["tz_string"])) {
    $_SESSION["tz_string"] = $_POST["tz_string"];
  }
  if (!empty($_POST["dst_first"])) {
    $_SESSION["dst_first"] = $_POST["dst_first"];
  }
  if (!empty($_POST["dst_second"])) {
    $_SESSION["dst_second"] = $_POST["dst_second"];
  }
  */
 
  if ($forlogin) {
    $apiService->setApprouvalPrompt('force');
  }
 
  // This may create record into oauth_state before the header redirect.
  // Creation of record with state in this tables depend on the Provider used (see its constructor).
  if ($state) {
    $url = $apiService->getAuthorizationUri(array('state' => $state));
  } else {
    $url = $apiService->getAuthorizationUri(); // Parameter state will be randomly generated
  }
  // The redirect_uri is included into this $url
 
  // Add more param
  $url .= '&nonce='.bin2hex(random_bytes(64/8));
 
  if ($forlogin) {
    // TODO Add param hd. What is it for ?
    //$url .= 'hd=xxx';
 
    if (GETPOST('username')) {
      $url .= '&login_hint='.urlencode(GETPOST('username'));
    }
 
    // Check that the redirect_uri that wil be used is same than url of current domain
 
    // Define $urlwithroot
    global $dolibarr_main_url_root;
    $urlwithouturlroot = preg_replace('/'.preg_quote(DOL_URL_ROOT, '/').'$/i', '', trim($dolibarr_main_url_root));
    $urlwithroot = $urlwithouturlroot.DOL_URL_ROOT; // This is to use external domain name found into config file
    //$urlwithroot = DOL_MAIN_URL_ROOT;       // This is to use same domain name than current
 
    include DOL_DOCUMENT_ROOT.'/core/lib/geturl.lib.php';
    $currentrooturl = getRootURLFromURL(DOL_MAIN_URL_ROOT);
    $externalrooturl = getRootURLFromURL($urlwithroot);
 
    if ($currentrooturl != $externalrooturl) {
      $langs->load("errors");
      setEventMessages($langs->trans("ErrorTheUrlOfYourDolInstanceDoesNotMatchURLIntoOAuthSetup", $currentrooturl, $externalrooturl), null, 'errors');
      $url = DOL_URL_ROOT;
    }
  }
 
  // we go on oauth provider authorization page
  header('Location: '.$url);
  exit();
} else {
  // We are coming from the return of an OAuth2 provider page.
  dol_syslog("We are coming from the oauth provider page keyforprovider=".$keyforprovider." code=".dol_trunc(GETPOST('code'), 5));
 
  // We must validate that the $state is the same than the one into $_SESSION['oauthstateanticsrf'], return error if not.
  if (isset($_SESSION['oauthstateanticsrf']) && $state != $_SESSION['oauthstateanticsrf']) {
    //var_dump($_SESSION['oauthstateanticsrf']);exit;
    print 'Value for state='.dol_escape_htmltag($state).' differs from value in $_SESSION["oauthstateanticsrf"]. Code is refused.';
    unset($_SESSION['oauthstateanticsrf']);
  } else {
    // This was a callback request from service, get the token
    try {
      //var_dump($state);
      //var_dump($apiService);      // OAuth\OAuth2\Service\Google
      //dol_syslog("_GET=".var_export($_GET, true));
 
      $errorincheck = 0;
 
      $db->begin();
 
      // This requests the token from the received OAuth code (call of the https://oauth2.googleapis.com/token endpoint)
      // Result is stored into object managed by class DoliStorage into includes/OAuth/Common/Storage/DoliStorage.php, so into table llx_oauth_token
      $token = $apiService->requestAccessToken(GETPOST('code'), $state);
 
      // Note: The extraparams has the 'id_token' than contains a lot of information about the user.
      $extraparams = $token->getExtraParams();
      $jwt = explode('.', $extraparams['id_token']);
 
      $username = '';
      $useremail = '';
 
      // Extract the middle part, base64 decode, then json_decode it
      if (!empty($jwt[1])) {
        $userinfo = json_decode(base64_decode($jwt[1]), true);
 
        dol_syslog("userinfo=".var_export($userinfo, true));
 
        $useremail = $userinfo['email'];
        /*
         $useremailverified = $userinfo['email_verified'];
         $useremailuniq = $userinfo['sub'];
         $username = $userinfo['name'];
         $userfamilyname = $userinfo['family_name'];
         $usergivenname = $userinfo['given_name'];
         $hd = $userinfo['hd'];
         */
 
        // We should make the steps of validation of id_token
 
        // Verify that the state is the one expected
        // TODO
 
        // Verify that the ID token is properly signed by the issuer. Google-issued tokens are signed using one of the certificates found at the URI specified in the jwks_uri metadata value of the Discovery document.
        // TODO
 
        // Verify that the value of the iss claim in the ID token is equal to https://accounts.google.com or accounts.google.com.
        if ($userinfo['iss'] != 'accounts.google.com' && $userinfo['iss'] != 'https://accounts.google.com') {
          setEventMessages($langs->trans('Bad value for returned userinfo[iss]'), null, 'errors');
          $errorincheck++;
        }
 
        // Verify that the value of the aud claim in the ID token is equal to your app's client ID.
        if ($userinfo['aud'] != getDolGlobalString($keyforparamid)) {
          setEventMessages($langs->trans('Bad value for returned userinfo[aud]'), null, 'errors');
          $errorincheck++;
        }
 
        // Verify that the expiry time (exp claim) of the ID token has not passed.
        if ($userinfo['exp'] <= dol_now()) {
          setEventMessages($langs->trans('Bad value for returned userinfo[exp]. Token expired.'), null, 'errors');
          $errorincheck++;
        }
 
        // If you specified a hd parameter value in the request, verify that the ID token has a hd claim that matches an accepted G Suite hosted domain.
        // $userinfo['hd'] is the domain name of Gmail account.
        // TODO
      }
 
      if (!$errorincheck) {
        // If call back to url for a OAUTH2 login
        if ($forlogin) {
          dol_syslog("we received the login/email to log to, it is ".$useremail);
 
          $tmparray = (empty($_SESSION['datafromloginform']) ? array() : $_SESSION['datafromloginform']);
          $entitytosearchuser = (isset($tmparray['entity']) ? $tmparray['entity'] : -1);
 
          // Delete the token
          $storage->clearToken('Google');
 
          $tmpuser = new User($db);
          $res = $tmpuser->fetch(0, '', '', 0, $entitytosearchuser, $useremail);
 
          if ($res > 0) {
            $username = $tmpuser->login;
 
            $_SESSION['googleoauth_receivedlogin'] = dol_hash($conf->file->instance_unique_id.$username, '0');
            dol_syslog('We set $_SESSION[\'googleoauth_receivedlogin\']='.$_SESSION['googleoauth_receivedlogin']);
          } else {
            $errormessage = "Failed to login using Google. User with the Email '".$useremail."' was not found";
            if ($entitytosearchuser > 0) {
              $errormessage .= ' ('.$langs->trans("Entity").' '.$entitytosearchuser.')';
            }
            $_SESSION["dol_loginmesg"] = $errormessage;
            $errorincheck++;
 
            dol_syslog($errormessage);
          }
        }
      } else {
        // If call back to url for a OAUTH2 login
        if ($forlogin) {
          $_SESSION["dol_loginmesg"] = "Failed to login using Google. OAuth callback URL retreives a token with non valid data";
          $errorincheck++;
        }
      }
 
      if (!$errorincheck) {
        $db->commit();
      } else {
        $db->rollback();
      }
 
      $backtourl = $_SESSION["backtourlsavedbeforeoauthjump"];
      unset($_SESSION["backtourlsavedbeforeoauthjump"]);
 
      if (empty($backtourl)) {
        $backtourl = DOL_URL_ROOT.'/';
      }
 
      // If call back to this url was for a OAUTH2 login
      if ($forlogin) {
        // _SESSION['googleoauth_receivedlogin'] has been set to the key to validate the next test by function_googleoauth(), so we can make the redirect
        $backtourl .= '?actionlogin=login&afteroauthloginreturn=1'.($username ? '&username='.urlencode($username) : '').'&token='.newToken();
        if (!empty($tmparray['entity'])) {
          $backtourl .= '&entity='.$tmparray['entity'];
        }
      }
 
      dol_syslog("Redirect now on backtourl=".$backtourl);
 
      header('Location: '.$backtourl);
      exit();
    } catch (Exception $e) {
      print $e->getMessage();
    }
  }
}
 
 
/*
 * View
 */
 
// No view at all, just actions, so we reach this line only on error.
 
$db->close();