Social login hybridauth and parse php

I need to help for social login and parse.

I use hybridauth class for social logins (http://hybridauth.sourceforge.net/)

I successfully login and signup with this. But i cant define parseuser with login. Because i cant know user pass and i cant retrive pass.

How can i login without user password in php?

http://hybridauth.sourceforge.net/userguide/HybridAuth_Sessions.html
HybridAuth have sesssions and parse php sdk have

$user = ParseUser::become("session-token-here");

i think i need to use this. But i cant figure out. Anyone here use social login with parse?

Here is my code:

    <?php
require "parse.php";
use Parse\ParseUser;
use Parse\ParseException;

if( isset( $_REQUEST["provider"] ) )
{
    // the selected provider
    $provider_name = $_REQUEST["provider"];

    try
    {
        // inlcude HybridAuth library
        // change the following paths if necessary
        $config   = 'hybridauth/config.php';
        require_once( "hybridauth/Hybrid/Auth.php" );

        // initialize Hybrid_Auth class with the config file
        $hybridauth = new Hybrid_Auth( $config );

        // try to authenticate with the selected provider
        $adapter = $hybridauth->authenticate( $provider_name );

        // then grab the user profile
        $user_profile = $adapter->getUserProfile();
    }

        // something went wrong?
    catch( Exception $e )
    {
        print_r($e);
    }

    // check if the current user already have authenticated using this provider before
    $user_exist = get_user_by_provider_and_id( $provider_name, $user_profile->identifier );

    // if the used didn't authenticate using the selected provider before
    // we create a new entry on database.users for him
    if( ! $user_exist )
    {
        create_new_hybridauth_user(
            $user_profile->email,
            $user_profile->firstName,
            $user_profile->lastName,
            $provider_name,
            $user_profile->identifier,
            $user_profile->displayName,
            $user_profile->description,
            $user_profile->photoURL
        );
    }

    // set the user as connected and redirect him
    $_SESSION["user_connected"] = true;

    header("Location: http://example.com");
}
function get_user_by_provider_and_id( $provider_name, $provider_user_id )
{
    $query = ParseUser::query();
    $query->equalTo("hybridauth_provider_name", $provider_name);
    $query->equalTo("hybridauth_provider_uid", $provider_user_id);
    $result = $query->find();
    return $result;
}

/*
* get the user data from database by provider name and provider user id
**/
function create_new_hybridauth_user( $email, $first_name, $last_name, $provider_name, $provider_user_id, $display_name, $desc, $photourl )
{
    // let generate a random password for the user
    $password = md5( str_shuffle( "0123456789abcdefghijklmnoABCDEFGHIJ" ) );
    $user = new ParseUser();
    $user->set("username", $display_name);
    $user->set("password", $password);
    $user->set("email", $email);
    $user->set("first_name", $first_name);
    $user->set("last_name", $last_name);
    $user->set("hybridauth_provider_name", $provider_name);
    $user->set("hybridauth_provider_uid", $provider_user_id);
    $user->set("description", $desc);
    $user->set("photourl", $photourl);

    try {
        $user->signUp();
        $currentUser = ParseUser::getCurrentUser();
    } catch (ParseException $ex) {
        // Show the error message somewhere and let the user try again.
        echo "Error: " . $ex->getCode() . " " . $ex->getMessage();
    }
}