Laravel 5: LDAP.Active Directory (AD)

Active Directory, AD, Authentication, LDAP, Login, users

ตัวอย่างการ login โดยใช้ Active Directory (AD) หรือ LDAP version ของ microsoft ทำการ authentication แทนข้อมูลผู้ใช้ในตาราง users

ติดตั้ง Adldap2/Adldap2-Laravel โดยใช้ command

cd D:\xampp\htdocs\laravel_dev
composer require adldap2/adldap2-laravel

ลงทะเบียน Adldap facade โดยเปิดไฟล์ config/app.php
```
    'aliases' => [

        'Adldap' => Adldap\Laravel\Facades\Adldap::class,

],
```

Publish Adldap service providers โดยใช้ command

php artisan vendor:publish --provider="Adldap\Laravel\AdldapServiceProvider"
php artisan vendor:publish --provider="Adldap\Laravel\AdldapAuthServiceProvider"

เปลี่ยน driver ของ user provider ในไฟล์ config/auth.php จาก eloquent เป็น ldap

    'providers' => [
        'users' => [
            'driver' => 'ldap', // eloquent
            'model' => App\User::class,
        ],

เพิ่ม config .env ถ้าใช้ synology จะได้ LDAP Server ประมาณ

IP

192.168.1.101

Base DN:

dc=phunsanit

Bind DN:

uid=root,cn=users,dc=phunsanit

ก็จะเพิ่มไปประมาณ
```
LDAP_SCHEMA=ActiveDirectory
LDAP_HOSTS=192.168.1.101
LDAP_LOGGING=true
LDAP_BASE_DN=dc=phunsanit
LDAP_USER_ATTRIBUTE=uid
LDAP_USER_FORMAT=uid=%s,cn=users,dc=phunsanit
LDAP_CONNECTION=default
```
โดยหลักการคือ

LDAP_BASE_DN

คือจุดเริ่มต้นข้อมูลที่เราสนใจ

LDAP_USER_FORMAT

จะโดน replace กับ user ที่ผู้ใช้กรอกข้อมูลเข้ามาเช่น user: pitt.p แทนที่ uid=%s,cn=users,dc=phunsanit จะได้ uid=pitt.p,cn=users,dc=phunsanit

โดยมีที่มาจาการทดลอง login ได้โดยใช้โปรแกรม Apache Directory Studio โดยชั้นของข้อมูลจะเป็น dc=phunsanit > cn=users > uid=pitt.p > ข้อมูลของ user นี้

แก้ ตาราง user อาจจะใช้ database/migrations/2014_10_12_000000_create_users_table.php

public function up()
    {
        Schema::create('users', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->string('name');

            /* remove
            $table->string('email')->unique();
            $table->timestamp('email_verified_at')->nullable();
             */
            //add
            $table->string('phone');

            $table->string('password');
            $table->rememberToken();
            $table->timestamps();
        });
    }

และใช้ command

php artisan migrate

(ถ้าไม่ได้เช็คให้ดีว่า connect database ถูกต้อง)

แก้ config/ldap.php ประมาณ

<?php

return [

    /*
    |--------------------------------------------------------------------------
    | Logging
    |--------------------------------------------------------------------------
    |
    | This option enables logging all LDAP operations on all configured
    | connections such as bind requests and CRUD operations.
    |
    | Log entries will be created in your default logging stack.
    |
    | This option is extremely helpful for debugging connectivity issues.
    |
     */

    'logging' => env('LDAP_LOGGING', false),

    /*
    |--------------------------------------------------------------------------
    | Connections
    |--------------------------------------------------------------------------
    |
    | This array stores the connections that are added to Adldap. You can add
    | as many connections as you like.
    |
    | The key is the name of the connection you wish to use and the value is
    | an array of configuration settings.
    |
     */

    'connections' => [

        'default' => [

            /*
            |--------------------------------------------------------------------------
            | Auto Connect
            |--------------------------------------------------------------------------
            |
            | If auto connect is true, Adldap will try to automatically connect to
            | your LDAP server in your configuration. This allows you to assume
            | connectivity rather than having to connect manually
            | in your application.
            |
            | If this is set to false, you **must** connect manually before running
            | LDAP operations. Otherwise, you will receive exceptions.
            |
             */

            'auto_connect' => env('LDAP_AUTO_CONNECT', true),

            /*
            |--------------------------------------------------------------------------
            | Connection
            |--------------------------------------------------------------------------
            |
            | The connection class to use to run raw LDAP operations on.
            |
            | Custom connection classes must implement:
            |
            |  Adldap\Connections\ConnectionInterface
            |
             */

            'connection' => Adldap\Connections\Ldap::class,

            /*
            |--------------------------------------------------------------------------
            | Connection Settings
            |--------------------------------------------------------------------------
            |
            | This connection settings array is directly passed into the Adldap constructor.
            |
            | Feel free to add or remove settings you don't need.
            |
             */

            'settings' => [

                /*
                |--------------------------------------------------------------------------
                | Schema
                |--------------------------------------------------------------------------
                |
                | The schema class to use for retrieving attributes and generating models.
                |
                | You can also set this option to `null` to use the default schema class.
                |
                | For OpenLDAP, you must use the schema:
                |
                |   Adldap\Schemas\OpenLDAP::class
                |
                | For FreeIPA, you must use the schema:
                |
                |   Adldap\Schemas\FreeIPA::class
                |
                | Custom schema classes must implement Adldap\Schemas\SchemaInterface
                |
                 */

                'schema' => Adldap\Schemas\ActiveDirectory::class,

                /*
                |--------------------------------------------------------------------------
                | Account Prefix
                |--------------------------------------------------------------------------
                |
                | The account prefix option is the prefix of your user accounts in LDAP directory.
                |
                | This string is prepended to all authenticating users usernames.
                |
                 */

                'account_prefix' => env('LDAP_ACCOUNT_PREFIX', ''),

                /*
                |--------------------------------------------------------------------------
                | Account Suffix
                |--------------------------------------------------------------------------
                |
                | The account suffix option is the suffix of your user accounts in your LDAP directory.
                |
                | This string is appended to all authenticating users usernames.
                |
                 */

                'account_suffix' => env('LDAP_ACCOUNT_SUFFIX', ''),

                /*
                |--------------------------------------------------------------------------
                | Domain Controllers
                |--------------------------------------------------------------------------
                |
                | The domain controllers option is an array of servers located on your
                | network that serve Active Directory. You can insert as many servers or
                | as little as you'd like depending on your forest (with the
                | minimum of one of course).
                |
                | These can be IP addresses of your server(s), or the host name.
                |
                 */

                'hosts' => explode(' ', env('LDAP_HOSTS', 'corp-dc1.corp.acme.org corp-dc2.corp.acme.org')),

                /*
                |--------------------------------------------------------------------------
                | Port
                |--------------------------------------------------------------------------
                |
                | The port option is used for authenticating and binding to your LDAP server.
                |
                 */

                'port' => env('LDAP_PORT', 389),

                /*
                |--------------------------------------------------------------------------
                | Timeout
                |--------------------------------------------------------------------------
                |
                | The timeout option allows you to configure the amount of time in
                | seconds that your application waits until a response
                | is received from your LDAP server.
                |
                 */

                'timeout' => env('LDAP_TIMEOUT', 5),

                /*
                |--------------------------------------------------------------------------
                | Base Distinguished Name
                |--------------------------------------------------------------------------
                |
                | The base distinguished name is the base distinguished name you'd
                | like to perform query operations on. An example base DN would be:
                |
                |        dc=corp,dc=acme,dc=org
                |
                | A correct base DN is required for any query results to be returned.
                |
                 */

                'base_dn' => env('LDAP_BASE_DN', 'dc=corp,dc=acme,dc=org'),

                /*
                |--------------------------------------------------------------------------
                | LDAP Username & Password
                |--------------------------------------------------------------------------
                |
                | When connecting to your LDAP server, a username and password is required
                | to be able to query and run operations on your server(s). You can
                | use any user account that has these permissions. This account
                | does not need to be a domain administrator unless you
                | require changing and resetting user passwords.
                |
                 */

                'username' => env('LDAP_USERNAME'),
                'password' => env('LDAP_PASSWORD'),

                /*
                |--------------------------------------------------------------------------
                | Follow Referrals
                |--------------------------------------------------------------------------
                |
                | The follow referrals option is a boolean to tell active directory
                | to follow a referral to another server on your network if the
                | server queried knows the information your asking for exists,
                | but does not yet contain a copy of it locally.
                |
                | This option is defaulted to false.
                |
                 */

                'follow_referrals' => false,

                /*
                |--------------------------------------------------------------------------
                | SSL & TLS
                |--------------------------------------------------------------------------
                |
                | If you need to be able to change user passwords on your server, then an
                | SSL or TLS connection is required. All other operations are allowed
                | on unsecured protocols.
                |
                | One of these options are definitely recommended if you
                | have the ability to connect to your server securely.
                |
                 */

                'use_ssl' => env('LDAP_USE_SSL', false),
                'use_tls' => env('LDAP_USE_TLS', false),

            ],

        ],

    ],

];

จุดสำคัญคือ

schema: จะบอกว่าใช้ protocal อะไร เช่นถ้าใช้ AD จะต้องเลือก Adldap\Schemas\ActiveDirectory::class, ถ้าใช้ LDAP ชนิดอื่นต้องเปลี่ยนจุดนี้
username: user ที่มีสิทธิแก้ข้อมูลใน LDAP server ถ้าไม่มีหรือไม่ต้องการแก้ข้อมูลเข้าไป (ห้ามใช้เด็ดขาด) เพราะจะทำให้ login ไม่สำเร็จ
password: password ของ user ที่มีสิทธิแก้ข้อมูลใน LDAP server ถ้าไม่มีหรือไม่ต้องการแก้ข้อมูลเข้าไป (ห้ามใช้เด็ดขาด) เพราะจะทำให้ login ไม่สำเร็จ

แก้ config/ldap_auth.php ประมาณ

<?php

return [

    /*
    |--------------------------------------------------------------------------
    | Connection
    |--------------------------------------------------------------------------
    |
    | The LDAP connection to use for Laravel authentication.
    |
    | You must specify connections in your `config/ldap.php` configuration file.
    |
     */

    'connection' => env('LDAP_CONNECTION', 'default'),

    /*
    |--------------------------------------------------------------------------
    | Provider
    |--------------------------------------------------------------------------
    |
    | The LDAP authentication provider to use depending
    | if you require database synchronization.
    |
    | For synchronizing LDAP users to your local applications database, use the provider:
    |
    | Adldap\Laravel\Auth\DatabaseUserProvider::class
    |
    | Otherwise, if you just require LDAP authentication, use the provider:
    |
    | Adldap\Laravel\Auth\NoDatabaseUserProvider::class
    |
     */

    'provider' => Adldap\Laravel\Auth\DatabaseUserProvider::class,

    /*
    |--------------------------------------------------------------------------
    | Model
    |--------------------------------------------------------------------------
    |
    | The model to utilize for authentication and importing.
    |
    | This option is only applicable to the DatabaseUserProvider.
    |
     */

    'model' => App\User::class,

    /*
    |--------------------------------------------------------------------------
    | Rules
    |--------------------------------------------------------------------------
    |
    | Rules allow you to control user authentication requests depending on scenarios.
    |
    | You can create your own rules and insert them here.
    |
    | All rules must extend from the following class:
    |
    |   Adldap\Laravel\Validation\Rules\Rule
    |
     */

    'rules' => [

        // Denys deleted users from authenticating.

        Adldap\Laravel\Validation\Rules\DenyTrashed::class,

        // Allows only manually imported users to authenticate.

        // Adldap\Laravel\Validation\Rules\OnlyImported::class,

    ],

    /*
    |--------------------------------------------------------------------------
    | Scopes
    |--------------------------------------------------------------------------
    |
    | Scopes allow you to restrict the LDAP query that locates
    | users upon import and authentication.
    |
    | All scopes must implement the following interface:
    |
    |   Adldap\Laravel\Scopes\ScopeInterface
    |
     */

    'scopes' => [

        // Only allows users with a user principal name to authenticate.
        // Suitable when using ActiveDirectory.
        // Adldap\Laravel\Scopes\UpnScope::class,

        // Only allows users with a uid to authenticate.
        // Suitable when using OpenLDAP.
        // Adldap\Laravel\Scopes\UidScope::class,

    ],

    'identifiers' => [

        /*
        |--------------------------------------------------------------------------
        | LDAP
        |--------------------------------------------------------------------------
        |
        | Locate Users By:
        |
        |   This value is the users attribute you would like to locate LDAP
        |   users by in your directory.
        |
        |   For example, using the default configuration below, if you're
        |   authenticating users with an email address, your LDAP server
        |   will be queried for a user with the a `userprincipalname`
        |   equal to the entered email address.
        |
        | Bind Users By:
        |
        |   This value is the users attribute you would
        |   like to use to bind to your LDAP server.
        |
        |   For example, when a user is located by the above attribute,
        |   the users attribute you specify below will be used as
        |   the 'username' to bind to your LDAP server.
        |
        |   This is usually their distinguished name.
        |
         */

        'ldap' => [

            'locate_users_by' => 'userprincipalname',

            'bind_users_by' => 'distinguishedname',

        ],

        'database' => [

            /*
            |--------------------------------------------------------------------------
            | GUID Column
            |--------------------------------------------------------------------------
            |
            | The value of this option is the database column that will contain the
            | LDAP users global identifier. This column does not need to be added
            | to the sync attributes below. It is synchronized automatically.
            |
            | This option is only applicable to the DatabaseUserProvider.
            |
             */

            'guid_column' => 'objectguid',

            /*
            |--------------------------------------------------------------------------
            | Username Column
            |--------------------------------------------------------------------------
            |
            | The value of this option is the database column that contains your
            | users login username.
            |
            | This column must be added to your sync attributes below to be
            | properly synchronized.
            |
            | This option is only applicable to the DatabaseUserProvider.
            |
             */

            'username_column' => 'email',

        ],

        /*
        |--------------------------------------------------------------------------
        | Windows Authentication Middleware (SSO)
        |--------------------------------------------------------------------------
        |
        | Local Users By:
        |
        |   This value is the users attribute you would like to locate LDAP
        |   users by in your directory.
        |
        |   For example, if 'samaccountname' is the value, then your LDAP server is
        |   queried for a user with the 'samaccountname' equal to the value of
        |   $_SERVER['AUTH_USER'].
        |
        |   If a user is found, they are imported (if using the DatabaseUserProvider)
        |   into your local database, then logged in.
        |
        | Server Key:
        |
        |    This value represents the 'key' of the $_SERVER
        |    array to pull the users account name from.
        |
        |    For example, $_SERVER['AUTH_USER'].
        |
         */

        'windows' => [

            'locate_users_by' => 'samaccountname',

            'server_key' => 'AUTH_USER',

        ],

    ],

    'passwords' => [

        /*
        |--------------------------------------------------------------------------
        | Password Sync
        |--------------------------------------------------------------------------
        |
        | The password sync option allows you to automatically synchronize users
        | LDAP passwords to your local database. These passwords are hashed
        | natively by Laravel using the Hash::make() method.
        |
        | Enabling this option would also allow users to login to their accounts
        | using the password last used when an LDAP connection was present.
        |
        | If this option is disabled, the local database account is applied a
        | random 16 character hashed password upon first login, and will
        | lose access to this account upon loss of LDAP connectivity.
        |
        | This option is only applicable to the DatabaseUserProvider.
        |
         */

        'sync' => env('LDAP_PASSWORD_SYNC', false),

        /*
        |--------------------------------------------------------------------------
        | Column
        |--------------------------------------------------------------------------
        |
        | This is the column of your users database table
        | that is used to store passwords.
        |
        | Set this to `null` if you do not have a password column.
        |
        | This option is only applicable to the DatabaseUserProvider.
        |
         */

        'column' => 'password',

    ],

    /*
    |--------------------------------------------------------------------------
    | Login Fallback
    |--------------------------------------------------------------------------
    |
    | The login fallback option allows you to login as a user located in the
    | local database if active directory authentication fails.
    |
    | Set this to true if you would like to enable it.
    |
    | This option is only applicable to the DatabaseUserProvider.
    |
     */

    'login_fallback' => env('LDAP_LOGIN_FALLBACK', false),

    /*
    |--------------------------------------------------------------------------
    | Sync Attributes
    |--------------------------------------------------------------------------
    |
    | Attributes specified here will be added / replaced on the user model
    | upon login, automatically synchronizing and keeping the attributes
    | up to date.
    |
    | The array key represents the users Laravel model key, and
    | the value represents the users LDAP attribute.
    |
    | You **must** include the users login attribute here.
    |
    | This option is only applicable to the DatabaseUserProvider.
    |
     */

    'sync_attributes' => [
        // 'field_in_local_db' => 'attribute_in_ldap_server',
        'username' => 'uid',
        'email' => 'userprincipalname',
        'name' => 'cn',
        'phone' => 'telephonenumber',
    ],

    /*
    |--------------------------------------------------------------------------
    | Logging
    |--------------------------------------------------------------------------
    |
    | User authentication attempts will be logged using Laravel's
    | default logger if this setting is enabled.
    |
    | No credentials are logged, only usernames.
    |
    | This is usually stored in the '/storage/logs' directory
    | in the root of your application.
    |
    | This option is useful for debugging as well as auditing.
    |
    | You can freely remove any events you would not like to log below,
    | as well as use your own listeners if you would prefer.
    |
     */

    'logging' => [

        'enabled' => env('LDAP_LOGGING', true),

        'events' => [

            \Adldap\Laravel\Events\Importing::class => \Adldap\Laravel\Listeners\LogImport::class,
            \Adldap\Laravel\Events\Synchronized::class => \Adldap\Laravel\Listeners\LogSynchronized::class,
            \Adldap\Laravel\Events\Synchronizing::class => \Adldap\Laravel\Listeners\LogSynchronizing::class,
            \Adldap\Laravel\Events\Authenticated::class => \Adldap\Laravel\Listeners\LogAuthenticated::class,
            \Adldap\Laravel\Events\Authenticating::class => \Adldap\Laravel\Listeners\LogAuthentication::class,
            \Adldap\Laravel\Events\AuthenticationFailed::class => \Adldap\Laravel\Listeners\LogAuthenticationFailure::class,
            \Adldap\Laravel\Events\AuthenticationRejected::class => \Adldap\Laravel\Listeners\LogAuthenticationRejection::class,
            \Adldap\Laravel\Events\AuthenticationSuccessful::class => \Adldap\Laravel\Listeners\LogAuthenticationSuccess::class,
            \Adldap\Laravel\Events\DiscoveredWithCredentials::class => \Adldap\Laravel\Listeners\LogDiscovery::class,
            \Adldap\Laravel\Events\AuthenticatedWithWindows::class => \Adldap\Laravel\Listeners\LogWindowsAuth::class,
            \Adldap\Laravel\Events\AuthenticatedModelTrashed::class => \Adldap\Laravel\Listeners\LogTrashedModel::class,

        ],
    ],

    'usernames' => [

        'ldap' => [

            // replace this line:
            // 'discover' => 'userprincipalname',
            // with this one:
            'discover' => env('LDAP_USER_ATTRIBUTE', 'userprincipalname'),

            // replace this line:
            // 'authenticate' => 'distinguishedname',
            // with this one:
            'authenticate' => env('LDAP_USER_ATTRIBUTE', 'distinguishedname'),

        ],

        // replace this line:
        // 'eloquent' => 'email',
        // with this one:
        'eloquent' => 'username',

    ],

];

จุดสำคัญคือ

sync_attributes: บอกให้ copy ค่าจาก attribute อะไรไปเก็บในตาราง users
usernames: คือการผูก username ในระบบ login ในตาราง ใน LDAP เข้าไว้ด้วยกัน

สร้างระบบ login โดย command
```
php artisan make:auth
```

แก้ login template ให้ใช้ username แทน email เปิด resources/views/auth/login.blade.php จาก

<div class="form-group row">
<label for="email" class="col-md-4 col-form-label text-md-right">{{ __('E-Mail Address') }}</label>

<div class="col-md-6">
    <input id="email" type="email" class="form-control @error('email') is-invalid @enderror" name="email" value="{{ old('email') }}" required autocomplete="email" autofocus>

    @error('email')
        <span class="invalid-feedback" role="alert">
            <strong>{{ $message }}</strong>
        </span>
    @enderror
</div>
</div>

เป็น

<div class="form-group row">
<label for="username" class="col-md-4 col-form-label text-md-right">{{ __('Username') }}</label>

<div class="col-md-6">
    <input id="username" type="text" class="form-control @error('username') is-invalid @enderror" name="username" value="{{ old('username') }}" required autocomplete="username" autofocus>

    @error('username')
        <span class="invalid-feedback" role="alert">
            <strong>{{ $message }}</strong>
        </span>
    @enderror
</div>
</div>

หลักๆ คือ replace email แทนที่โดย username นั่นละ ลบ link เกี่ยวกับการ reset password ใน

<a class="btn btn-link" href="">

</a>

แก้ app/Http/Controllers/Auth/LoginController.php โดยจะเป็นส่วนที่ทำการ login และทำหน้าที่ insert / update ข้อมูลกลับไปให้ตาราง users แก้ประมาณ

<?php

namespace App\Http\Controllers\Auth;

use Adldap\Laravel\Facades\Adldap;
use App\Http\Controllers\Controller;
use Illuminate\Foundation\Auth\AuthenticatesUsers;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;

class LoginController extends Controller
{
    /*
    |--------------------------------------------------------------------------
    | Login Controller
    |--------------------------------------------------------------------------
    |
    | This controller handles authenticating users for the application and
    | redirecting them to your home screen. The controller uses a trait
    | to conveniently provide its functionality to your applications.
    |
     */

    use AuthenticatesUsers;

    /**
     * Where to redirect users after login.
     *
     * @var string
     */
    protected $redirectTo = '/home';

    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        $this->middleware('guest')->except('logout');
    }

    /* cusstom */

    /**
     * Handle a login request to the application.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\RedirectResponse|\Illuminate\Http\Response|\Illuminate\Http\JsonResponse
     *
     * @throws \Illuminate\Validation\ValidationException
     */
    public function login(Request $request)
    {
        $this->validateLogin($request);

        // If the class is using the ThrottlesLogins trait, we can automatically throttle
        // the login attempts for this application. We'll key this by the username and
        // the IP address of the client making these requests into this application.
        if ($this->hasTooManyLoginAttempts($request)) {
            $this->fireLockoutEvent($request);

            return $this->sendLockoutResponse($request);
        }

        if ($this->attemptLogin($request)) {
            return $this->sendLoginResponse($request);
        }

        // If the login attempt was unsuccessful we will increment the number of attempts
        // to login and redirect the user back to the login form. Of course, when this
        // user surpasses their maximum number of attempts they will get locked out.
        $this->incrementLoginAttempts($request);

        return $this->sendFailedLoginResponse($request);
    }

    /**
     * Attempt to log the user into the application.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return bool
     */
    protected function attemptLogin(Request $request)
    {
        $credentials = $request->only($this->username(), 'password');
        $username = $credentials[$this->username()];
        $password = $credentials['password'];

        $user_format = env('LDAP_USER_FORMAT', 'cn=%s,' . env('LDAP_BASE_DN', ''));
        $userdn = sprintf($user_format, $username);

        // you might need this, as reported in
        // [#14](https://github.com/jotaelesalinas/laravel-simple-ldap-auth/issues/14):
        // Adldap::auth()->bind($userdn, $password);

        if (Adldap::auth()->attempt($userdn, $password, $bindAsUser = true)) {
            // the user exists in the LDAP server, with the provided password

            $user = \App\User::where($this->username(), $username)->first();
            if (!$user) {
                // the user doesn't exist in the local database, so we have to create one

                $user = new \App\User();
                $user->username = $username;
                $user->password = '';

                // you can skip this if there are no extra attributes to read from the LDAP server
                // or you can move it below this if(!$user) block if you want to keep the user always
                // in sync with the LDAP server
                $sync_attrs = $this->retrieveSyncAttributes($username);
                foreach ($sync_attrs as $field => $value) {
                    $user->$field = $value !== null ? $value : '';
                }
            }

            // by logging the user we create the session, so there is no need to login again (in the configured time).
            // pass false as second parameter if you want to force the session to expire when the user closes the browser.
            // have a look at the section 'session lifetime' in `config/session.php` for more options.
            $this->guard()->login($user, true);
            return true;
        }

        // the user doesn't exist in the LDAP server or the password is wrong
        // log error
        return false;
    }

    protected function retrieveSyncAttributes($username)
    {
        $ldapuser = Adldap::search()->where(env('LDAP_USER_ATTRIBUTE'), '=', $username)->first();
        if (!$ldapuser) {
            // log error
            return false;
        }
        // if you want to see the list of available attributes in your specific LDAP server:
        // var_dump($ldapuser->attributes); exit;

        // needed if any attribute is not directly accessible via a method call.
        // attributes in \Adldap\Models\User are protected, so we will need
        // to retrieve them using reflection.
        $ldapuser_attrs = null;

        $attrs = [];

        foreach (config('ldap_auth.sync_attributes') as $local_attr => $ldap_attr) {
            if ($local_attr == 'username') {
                continue;
            }

            $method = 'get' . $ldap_attr;
            if (method_exists($ldapuser, $method)) {
                $attrs[$local_attr] = $ldapuser->$method();
                continue;
            }

            if ($ldapuser_attrs === null) {
                $ldapuser_attrs = self::accessProtected($ldapuser, 'attributes');
            }

            if (!isset($ldapuser_attrs[$ldap_attr])) {
                // an exception could be thrown
                $attrs[$local_attr] = null;
                continue;
            }

            if (!is_array($ldapuser_attrs[$ldap_attr])) {
                $attrs[$local_attr] = $ldapuser_attrs[$ldap_attr];
            }

            if (count($ldapuser_attrs[$ldap_attr]) == 0) {
                // an exception could be thrown
                $attrs[$local_attr] = null;
                continue;
            }

            // now it returns the first item, but it could return
            // a comma-separated string or any other thing that suits you better
            $attrs[$local_attr] = $ldapuser_attrs[$ldap_attr][0];
            //$attrs[$local_attr] = implode(',', $ldapuser_attrs[$ldap_attr]);
        }

        return $attrs;
    }

    protected static function accessProtected($obj, $prop)
    {
        $reflection = new \ReflectionClass($obj);
        $property = $reflection->getProperty($prop);
        $property->setAccessible(true);
        return $property->getValue($obj);
    }

    /**
     * Get the login username to be used by the controller.
     *
     * @return string
     */
    public function username()
    {
        return 'username';
    }

}

จุดสำคัญคือ

use AuthenticatesUsers: ต้นแบบของระบบ login ที่เอามา overwrite ถ้าทำตามทั้งหมดแล้วใช้ไม่ได้ จะเป็นผู้ต้องสงสัยอันดับหนึ่งว่า แกเปลี่ยนไปใช่มั๋ยสาด
public function login: function ที่เขียนมา overwrite function login ใน AuthenticatesUsers เป็นแกนกลางของระบบ login ที่ข้อมูลของฟอร์ม login จะถูกส่งเข้ามาที่ function นี้เป็นที่แรก
protected function attemptLogin: เป็น function ที่จะใช้ตรวจสอบว่า username และ password ถูกต้องจริงรึเปล่า ถ้าถูกจะ return ค่าจากตาราง users กลับไปโดย code ตัวนี้จะอ่านค่าจาก LDAP จากกนั้นจะ insert / update ไปที่ตาราง users ด้วย
public function username(): เป็น function ที่บอกใช้ laravel ใช้ username แทน email ในการ login ที่แก้ใน login template

ทดลอง login ถ้าไม่ได้กลับไปทำขั้นตอนแรกใหม่
แก้ routes ให้ router ที่ต้องการจำเป็นต้องมีการ login ก่อนจึงใช้ได้ เปิดไฟล์ routes/web.php ลบ Auth::routes(); ออกแทนที่ด้วย
```
// Auth::routes();
Route::get('login', 'Auth\LoginController@showLoginForm')->name('login');
Route::post('login', 'Auth\LoginController@login');
Route::post('logout', 'Auth\LoginController@logout')->name('logout');
```
และครอบ routes ที่ต้องการให้ต้อง login ถึงจะใช้ได้โดย
```
Route::middleware('auth')->group(function () {
...
    Route::get('/home', 'HomeController@index')->name('home');
...
});
```
ลบส่วนที่ไม่จำเป็นออกเพื่อความปลอดภัย
- app/Http/Controllers/Auth/ForgotPasswordController.php
- app/Http/Controllers/Auth/RegisterController.php
- app/Http/Controllers/Auth/ResetPasswordController.php
- app/Http/Controllers/Auth/VerificationController.php
- database/migrations/2014_10_12_100000_create_password_resets_table.php
- resources/views/auth/passwords
- resources/views/auth/register.blade.php
- resources/views/auth/verify.blade.php

ขอบคุณ José Luis Salinas ที่เขียน laravel-simple-ldap-auth Howto: adminless LDAP authentification in Laravel ที่ช่วยไขความกระจ่างให้ config ครั้งนี้สำเร็จ

Laravel 5: LDAP.Active Directory (AD)

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Laravel 5: LDAP.Active Directory (AD)