fix(webauthn): enable security keys behind an external TLS proxy

WebauthnService::available() keyed on request()->isSecure(), which is false in
external-proxy mode (the forwarded https scheme isn't trusted without
TRUSTED_PROXY_CIDR) — so hardware keys were locked even though the panel runs
over HTTPS on the domain. Gate on being reached via the active domain instead
(always HTTPS through the front door); the bare-IP recovery host stays locked.
A core security feature no longer depends on an optional proxy setting.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -13,6 +13,17 @@ getaggte Releases (Kanal `stable`, optional `beta`) — niemals Entwicklungs-Bui
 
 _Keine offenen Änderungen — der nächste Stand wird hier gesammelt und als `vX.Y.Z` getaggt._
 
+## [0.9.20] - 2026-06-19
+
+### Behoben
+- **Security-Keys (WebAuthn/YubiKey) waren hinter einem externen TLS-Proxy gesperrt.** Die
+  Verfügbarkeit hing an `request()->isSecure()` — das im Externer-Proxy-Modus `false` ist (der
+  weitergereichte HTTPS-Scheme wird ohne `TRUSTED_PROXY_CIDR` nicht vertraut), obwohl das Panel
+  über die Domain per HTTPS läuft. Security-Keys werden jetzt freigeschaltet, sobald das Panel über
+  die **aktive Domain** erreicht wird (immer HTTPS über die Vordertür), unabhängig vom hier
+  erkannten Request-Scheme. Der Bare-IP-Recovery-Pfad (kein Secure-Context) bleibt korrekt gesperrt.
+  Ein Kern-Sicherheitsfeature hängt damit nicht mehr an einer optionalen Proxy-Einstellung.
+
 ## [0.9.19] - 2026-06-19
 
 ### Behoben

app/Services/WebauthnService.php

@@ -38,10 +38,23 @@ class WebauthnService
 
     public function __construct(private DeploymentService $deployment) {}
 
-    /** WebAuthn needs a secure context AND a domain rpId — never a bare IP. */
+    /**
+     * WebAuthn needs a secure context AND a domain rpId — never a bare IP. Available when the
+     * panel is reached via the ACTIVE DOMAIN, which is always served over HTTPS through the front
+     * door (Caddy's own TLS or an external TLS proxy). Deliberately NOT keyed on
+     * request()->isSecure(): behind an external TLS proxy the forwarded scheme may not be trusted
+     * here, so the request looks like plain HTTP even though the browser context is secure — that
+     * would wrongly lock out hardware keys. The bare-IP recovery host (http, no secure context)
+     * is excluded by the host check.
+     */
     public function available(): bool
     {
-        return $this->deployment->domain() !== null && request()->isSecure();
+        $domain = $this->deployment->domain();
+        $request = request();
+
+        return $domain !== null
+            && $request !== null
+            && strtolower($request->getHost()) === $domain;
     }
 
     /** The Relying-Party ID = the active domain (asserted present by available()). */

config/clusev.php

@@ -2,7 +2,7 @@
 
 return [
     // First tagged release is v0.1.0 (semantic, not -dev).
-    'version' => '0.9.19',
+    'version' => '0.9.20',
 
     // Deployed commit + branch. install.sh bakes these into .env from the host's .git (the prod
     // image ships no .git); the Versions page prefers them and falls back to a live .git read in

tests/Feature/WebauthnAvailableTest.php

@@ -4,33 +4,37 @@ namespace Tests\Feature;
 
 use App\Services\DeploymentService;
 use App\Services\WebauthnService;
+use Illuminate\Http\Request;
 use Tests\TestCase;
 
 class WebauthnAvailableTest extends TestCase
 {
-    private function service(?string $domain): WebauthnService
+    private function service(?string $domain, string $host = 'panel.example.com'): WebauthnService
     {
         $deployment = $this->mock(DeploymentService::class);
         $deployment->shouldReceive('domain')->andReturn($domain);
+        // The bound request decides the host WebAuthn availability keys on.
+        app()->instance('request', Request::create('http://'.$host.'/settings/security'));
 
         return app(WebauthnService::class);
     }
 
-    public function test_available_only_with_domain_and_https(): void
+    public function test_available_when_reached_via_the_active_domain_even_over_plain_http(): void
     {
-        $this->app['request']->server->set('HTTPS', 'on');
-        $this->assertTrue($this->service('panel.example.com')->available());
+        // External-proxy mode: the request looks like plain HTTP here, but the browser context is
+        // secure (the proxy serves HTTPS). Host == active domain → hardware keys are available.
+        $this->assertTrue($this->service('panel.example.com', 'panel.example.com')->available());
     }
 
-    public function test_unavailable_without_domain(): void
+    public function test_unavailable_without_a_domain(): void
     {
-        $this->app['request']->server->set('HTTPS', 'on');
-        $this->assertFalse($this->service(null)->available());
+        $this->assertFalse($this->service(null, 'panel.example.com')->available());
     }
 
-    public function test_unavailable_without_https(): void
+    public function test_unavailable_on_the_bare_ip_recovery_host(): void
     {
-        $this->app['request']->server->remove('HTTPS');
-        $this->assertFalse($this->service('panel.example.com')->available());
+        // Reached via the IP recovery path (plain HTTP, no secure context) → locked even with a
+        // domain configured; the rpId would not match the IP origin anyway.
+        $this->assertFalse($this->service('panel.example.com', '10.0.0.5')->available());
     }
 }