Enable authentication if the LDAP server has multiple base DNs. Store the user's credentials in a cookie/session, and swap them out to the configured credentials when logged in.

app/Http/Controllers/Auth/LoginController.php

@@ -3,7 +3,9 @@
 namespace App\Http\Controllers\Auth;
 
 use Illuminate\Foundation\Auth\AuthenticatesUsers;
+use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Cookie;
 
 use App\Http\Controllers\Controller;
 use App\Providers\RouteServiceProvider;
@@ -49,6 +51,35 @@ class LoginController extends Controller
 	}
 
 	/**
+	 * We need to delete our encrypted username/password cookies
+	 *
+	 * @note The rest of this function is the same as a normal laravel logout as in AuthenticatesUsers::class
+	 * @param Request $request
+	 * @return \Illuminate\Contracts\Foundation\Application|JsonResponse|\Illuminate\Http\RedirectResponse|\Illuminate\Routing\Redirector|mixed
+	 */
+	public function logout(Request $request)
+	{
+		// Delete our LDAP authentication cookies
+		Cookie::queue(Cookie::forget('username_encrypt'));
+		Cookie::queue(Cookie::forget('password_encrypt'));
+
+		$this->guard()->logout();
+
+		$request->session()->invalidate();
+
+		$request->session()->regenerateToken();
+
+		if ($response = $this->loggedOut($request)) {
+			return $response;
+		}
+
+		return $request->wantsJson()
+			? new JsonResponse([], 204)
+			: redirect('/');
+	}
+
+	/**
+	 *
 	 * Show our themed login page
 	 */
 	public function showLoginForm()

app/Http/Kernel.php

@@ -3,9 +3,9 @@
 namespace App\Http;
 
 use Illuminate\Foundation\Http\Kernel as HttpKernel;
-use Laravel\Passport\Http\Middleware\CreateFreshApiToken;
 
 use App\Http\Middleware\GuestUser;
+use App\Http\Middleware\SwapinAuthUser;
 
 class Kernel extends HttpKernel
 {
@@ -36,7 +36,8 @@ class Kernel extends HttpKernel
             \App\Http\Middleware\EncryptCookies::class,
             \Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse::class,
             \Illuminate\Session\Middleware\StartSession::class,
-            // \Illuminate\Session\Middleware\AuthenticateSession::class,
+            SwapinAuthUser::class,
+            \Illuminate\Session\Middleware\AuthenticateSession::class,
             \Illuminate\View\Middleware\ShareErrorsFromSession::class,
             \App\Http\Middleware\VerifyCsrfToken::class,
             \Illuminate\Routing\Middleware\SubstituteBindings::class,
@@ -46,6 +47,8 @@ class Kernel extends HttpKernel
 
         'api' => [
             'throttle:60,1',
+            \App\Http\Middleware\EncryptCookies::class,
+            SwapinAuthUser::class,
             \Illuminate\Routing\Middleware\SubstituteBindings::class,
         ],
     ];

app/Http/Middleware/SwapinAuthUser.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Config;
+use Illuminate\Support\Facades\Cookie;
+// use Illuminate\Support\Facades\Crypt;
+use Illuminate\Support\Facades\Log;
+// use Illuminate\Support\Facades\Session;
+use LdapRecord\Container;
+
+use App\Ldap\Connection;
+
+class SwapinAuthUser
+{
+    /**
+     * Handle an incoming request.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @param  \Closure(\Illuminate\Http\Request): (\Illuminate\Http\Response|\Illuminate\Http\RedirectResponse)  $next
+     * @return \Illuminate\Http\Response|\Illuminate\Http\RedirectResponse
+     */
+    public function handle(Request $request, Closure $next)
+    {
+		$key = config('ldap.default');
+
+		/*
+		// Rebuild our connection with the authenticated user.
+		if (Session::has('username_encrypt') && Session::has('password_encrypt')) {
+			Config::set('ldap.connections.'.$key.'.username',Crypt::decryptString(Session::get('username_encrypt')));
+			Config::set('ldap.connections.'.$key.'.password',Crypt::decryptString(Session::get('password_encrypt')));
+
+		} else
+		*/
+
+		if (Cookie::has('username_encrypt') && Cookie::has('password_encrypt')) {
+			Config::set('ldap.connections.'.$key.'.username',Cookie::get('username_encrypt'));
+			Config::set('ldap.connections.'.$key.'.password',Cookie::get('password_encrypt'));
+
+			Log::debug('Swapping out configured LDAP credentials with the user\'s cookie.');
+		}
+
+		// We need to override our Connection object so that we can store and retrieve the logged in user and swap out the credentials to use them.
+		Container::getInstance()->addConnection(new Connection(config('ldap.connections.'.$key)),$key);
+
+		return $next($request);
+    }
+}

app/Ldap/Connection.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Ldap;
+
+use LdapRecord\Connection as ConnectionBase;
+use LdapRecord\LdapInterface;
+
+class Connection extends ConnectionBase
+{
+
+	public function __construct($config = [], LdapInterface $ldap = null)
+	{
+		parent::__construct($config,$ldap);
+
+		// We need to override this so that we use our own Guard, that stores the users credentials in the session
+		$this->authGuardResolver = function () {
+			return new Guard($this->ldap, $this->configuration);
+		};
+	}
+}

app/Ldap/Guard.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace App\Ldap;
+
+use Illuminate\Support\Facades\Cookie;
+// use Illuminate\Support\Facades\Crypt;
+use LdapRecord\Auth\Guard as GuardBase;
+
+class Guard extends GuardBase
+{
+	public function attempt($username, $password, $stayBound = false)
+	{
+		if ($result = parent::attempt($username,$password,$stayBound)) {
+			/*
+			 * We can either use our session or cookies to store this. If using session, then Http/Kernel needs to be
+			 * updated to start a session for API calls.
+			// We need to store our password so that we can swap in the user in during SwapinAuthUser::class middleware
+			request()->session()->put('username_encrypt',Crypt::encryptString($username));
+			request()->session()->put('password_encrypt',Crypt::encryptString($password));
+			*/
+
+			// For our API calls, we store the cookie - which our cookies are already encrypted
+			Cookie::queue('username_encrypt',$username);
+			Cookie::queue('password_encrypt',$password);
+		}
+
+		return $result;
+	}
+}

app/Ldap/LdapUserRepository.php

@@ -0,0 +1,73 @@
+<?php
+
+namespace App\Ldap;
+
+use Illuminate\Contracts\Support\Arrayable;
+use Illuminate\Support\Str;
+use LdapRecord\Laravel\Events\Auth\DiscoveredWithCredentials;
+use LdapRecord\Laravel\LdapUserRepository as LdapUserRepositoryBase;
+use LdapRecord\Models\Model;
+
+class LdapUserRepository extends LdapUserRepositoryBase
+{
+	/**
+	 * Retrieve a user by the given credentials.
+	 *
+	 * @param array $credentials
+	 *
+	 * @return Model|null
+	 * @throws \LdapRecord\Query\ObjectNotFoundException
+	 */
+	public function findByCredentials(array $credentials = []): ?Model
+	{
+		if (empty($credentials)) {
+			return NULL;
+		}
+
+		// Look for a user using all our baseDNs
+		foreach ((new Entry)->baseDNs() as $base) {
+			$query = $this->query()->setBaseDn($base);
+
+			foreach ($credentials as $key => $value) {
+				if (Str::contains($key, $this->bypassCredentialKeys)) {
+					continue;
+				}
+
+				if (is_array($value) || $value instanceof Arrayable) {
+					$query->whereIn($key, $value);
+				} else {
+					$query->where($key, $value);
+				}
+			}
+
+			if (! is_null($user = $query->first())) {
+				event(new DiscoveredWithCredentials($user));
+
+				return $user;
+			}
+		}
+
+		return NULL;
+	}
+
+	/**
+	 * Get a user by their object GUID.
+	 *
+	 * @param string $guid
+	 *
+	 * @return Model|null
+	 * @throws \LdapRecord\Query\ObjectNotFoundException
+	 */
+	public function findByGuid($guid): ?Model
+	{
+		// Look for a user using all our baseDNs
+		foreach ((new Entry)->baseDNs() as $base) {
+			$user = $this->query()->setBaseDn($base)->findByGuid($guid);
+
+			if ($user)
+				return $user;
+		}
+
+		return NULL;
+	}
+}

app/Providers/AppServiceProvider.php

@@ -4,6 +4,9 @@ namespace App\Providers;
 
 use Illuminate\Support\ServiceProvider;
 use LdapRecord\Configuration\DomainConfiguration;
+use LdapRecord\Laravel\LdapRecord;
+
+use App\Ldap\LdapUserRepository;
 
 class AppServiceProvider extends ServiceProvider
 {
@@ -16,6 +19,9 @@ class AppServiceProvider extends ServiceProvider
 	{
 		// Add a new option available to be set in the configuration:
 		DomainConfiguration::extend('name', $default = null);
+
+		// Use our LdapUserRepository to support multiple baseDN querying
+		LdapRecord::locateUsersUsing(LdapUserRepository::class);
 	}
 
 	/**

resources/views/debug.blade.php

@@ -24,9 +24,9 @@
 						<td>BaseDN(s)</td>
 						<td>
 							<table class="table table-sm table-borderless">
-								@foreach(\App\Ldap\Entry::baseDN()->sort(function($item) { return $item->sortKey; }) as $item)
+								@foreach(\App\Ldap\Entry::baseDNs()->sort(function($item) { return $item->sortKey; }) as $item)
 									<tr>
-										<td>{{ $item->getDn() }}</td>
+										<td class="pl-0">{{ $item->getDn() }}</td>
 									</tr>
 								@endforeach
 							</table>

tests/Unit/GetBaseDNTest.php

@@ -13,11 +13,11 @@ class GetBaseDNTest extends TestCase
 	 *
 	 * @return void
 	 * @throws \LdapRecord\Query\ObjectNotFoundException
-	 * @covers \App\Ldap\Entry::baseDN()
+	 * @covers \App\Ldap\Entry::baseDNs()
 	 */
 	public function testBaseDnExists()
 	{
-		$o = (new Entry)->baseDN();
+		$o = (new Entry)->baseDNs();
 
 		$this->assertIsObject($o);
 		$this->assertCount(6,$o->toArray());