From 519a186e841d0d5c3f56c38af8aeb7cfc7d63cdd Mon Sep 17 00:00:00 2001
From: Tristan Rhodes <tristan.rhodes@gmail.com>
Date: Thu, 9 Apr 2026 09:38:56 -0600
Subject: [PATCH] fix: normalize oauth emails before matching users

---
 app/Http/Controllers/OauthController.php |  9 ++-
 tests/Feature/OauthControllerTest.php    | 79 ++++++++++++++++++++++++
 2 files changed, 86 insertions(+), 2 deletions(-)
 create mode 100644 tests/Feature/OauthControllerTest.php

diff --git a/app/Http/Controllers/OauthController.php b/app/Http/Controllers/OauthController.php
index 3a3f18c9c..4038fe63e 100644
--- a/app/Http/Controllers/OauthController.php
+++ b/app/Http/Controllers/OauthController.php
@@ -19,7 +19,12 @@ public function callback(string $provider)
     {
         try {
             $oauthUser = get_socialite_provider($provider)->user();
-            $user = User::whereEmail($oauthUser->email)->first();
+            $email = trim((string) $oauthUser->email);
+            if ($email === '') {
+                abort(403, 'OAuth provider did not return an email address');
+            }
+            $email = strtolower($email);
+            $user = User::whereEmail($email)->first();
             if (! $user) {
                 $settings = instanceSettings();
                 if (! $settings->is_registration_enabled) {
@@ -28,7 +33,7 @@ public function callback(string $provider)
 
                 $user = User::create([
                     'name' => $oauthUser->name,
-                    'email' => $oauthUser->email,
+                    'email' => $email,
                 ]);
             }
             Auth::login($user);
diff --git a/tests/Feature/OauthControllerTest.php b/tests/Feature/OauthControllerTest.php
new file mode 100644
index 000000000..af5fb0658
--- /dev/null
+++ b/tests/Feature/OauthControllerTest.php
@@ -0,0 +1,79 @@
+<?php
+
+use App\Models\InstanceSettings;
+use App\Models\OauthSetting;
+use App\Models\User;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Laravel\Socialite\Facades\Socialite;
+
+uses(RefreshDatabase::class);
+
+beforeEach(function () {
+    InstanceSettings::create([
+        'id' => 0,
+        'is_registration_enabled' => false,
+    ]);
+
+    OauthSetting::create([
+        'provider' => 'google',
+        'client_id' => 'client-id',
+        'client_secret' => 'client-secret',
+        'redirect_uri' => 'https://coolify.example.com/auth/google/callback',
+        'tenant' => 'example.com',
+    ]);
+});
+
+it('logs in an existing user when the oauth provider returns a mixed-case email', function () {
+    config()->set('app.maintenance.driver', 'file');
+
+    $user = User::factory()->create([
+        'email' => 'username@example.edu',
+    ]);
+
+    $provider = \Mockery::mock();
+    $provider->shouldReceive('setConfig')->once()->andReturnSelf();
+    $provider->shouldReceive('with')->once()->with(['hd' => 'example.com'])->andReturnSelf();
+    $provider->shouldReceive('user')->once()->andReturn((object) [
+        'email' => 'UserName@example.edu',
+        'name' => 'Example User',
+        'id' => 'google-user-id',
+    ]);
+
+    Socialite::shouldReceive('driver')->once()->with('google')->andReturn($provider);
+
+    $response = $this->get(route('auth.callback', 'google'));
+
+    $response->assertRedirect('/');
+    $this->assertAuthenticatedAs($user);
+    expect(User::count())->toBe(1);
+});
+
+it('rejects oauth logins when the provider does not return an email address', function (?string $providerEmail) {
+    config()->set('app.maintenance.driver', 'file');
+    InstanceSettings::firstOrCreate([
+        'id' => 0,
+    ], [
+        'is_registration_enabled' => false,
+    ])->update([
+        'is_registration_enabled' => true,
+    ]);
+
+    $provider = \Mockery::mock();
+    $provider->shouldReceive('setConfig')->once()->andReturnSelf();
+    $provider->shouldReceive('with')->once()->with(['hd' => 'example.com'])->andReturnSelf();
+    $provider->shouldReceive('user')->once()->andReturn((object) [
+        'email' => $providerEmail,
+        'name' => 'Example User',
+        'id' => 'google-user-id',
+    ]);
+
+    Socialite::shouldReceive('driver')->once()->with('google')->andReturn($provider);
+
+    $response = $this->from('/login')->get(route('auth.callback', 'google'));
+
+    $response->assertRedirect('/login');
+    expect(User::count())->toBe(0);
+})->with([
+    'null email' => [null],
+    'blank email' => ['   '],
+]);