use more minimal payload for QR code sake

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

authentik/stages/authenticator_mobile/models.py

@@ -7,12 +7,19 @@ from django.utils.translation import gettext_lazy as _
 from django.views import View
 from django_otp.models import Device
 from rest_framework.serializers import BaseSerializer, Serializer
+from authentik.core.models import ExpiringModel
 
 from authentik.core.types import UserSettingSerializer
 from authentik.flows.models import ConfigurableStage, FriendlyNamedStage, Stage
+from authentik.lib.generators import generate_id
 from authentik.lib.models import SerializerModel
 
 
+def default_token_key():
+    """Default token key"""
+    return generate_id(40)
+
+
 class AuthenticatorMobileStage(ConfigurableStage, FriendlyNamedStage, Stage):
     """Setup Duo authenticator devices"""
 
@@ -70,3 +77,9 @@ class MobileDevice(SerializerModel, Device):
     class Meta:
         verbose_name = _("Mobile Device")
         verbose_name_plural = _("Mobile Devices")
+
+class MobileDeviceToken(ExpiringModel):
+
+    device = models.ForeignKey(MobileDevice, on_delete=models.CASCADE, null=True)
+    user = models.ForeignKey(get_user_model(), on_delete=models.CASCADE)
+    token = models.TextField(default=default_token_key)

authentik/stages/authenticator_mobile/stage.py

@@ -2,6 +2,7 @@
 from django.http import HttpResponse
 from django.utils.timezone import now
 from rest_framework.fields import CharField
+from authentik.core.api.utils import PassiveSerializer
 
 from authentik.events.models import Event, EventAction
 from authentik.flows.challenge import (
@@ -11,16 +12,22 @@ from authentik.flows.challenge import (
     WithUserInfoChallenge,
 )
 from authentik.flows.stage import ChallengeStageView
-from authentik.stages.authenticator_mobile.models import AuthenticatorMobileStage
+from authentik.stages.authenticator_mobile.models import AuthenticatorMobileStage, MobileDeviceToken
 
-SESSION_KEY_MOBILE_ENROLL = "authentik/stages/authenticator_mobile/enroll"
+FLOW_PLAN_MOBILE_ENROLL = "authentik/stages/authenticator_mobile/enroll"
 
 
+class AuthenticatorMobilePayloadChallenge(PassiveSerializer):
+    """Payload within the QR code given to the mobile app, hence the short variable names"""
+
+    u = CharField(required=False, help_text="Server URL")
+    s = CharField(required=False, help_text="Stage UUID")
+    t = CharField(required=False, help_text="Initial Token")
+
 class AuthenticatorMobileChallenge(WithUserInfoChallenge):
     """Mobile Challenge"""
 
-    authentik_url = CharField(required=True)
-    stage_uuid = CharField(required=True)
+    payload = AuthenticatorMobilePayloadChallenge(required=True)
     component = CharField(default="ak-stage-authenticator-mobile")
 
 
@@ -35,13 +42,28 @@ class AuthenticatorMobileStageView(ChallengeStageView):
 
     response_class = AuthenticatorMobileChallengeResponse
 
+    def prepare(self):
+        if FLOW_PLAN_MOBILE_ENROLL in self.executor.plan.context:
+            return
+        token = MobileDeviceToken.objects.create(
+            user=self.get_pending_user(),
+        )
+        self.executor.plan.context[FLOW_PLAN_MOBILE_ENROLL] = token
+
     def get_challenge(self, *args, **kwargs) -> Challenge:
         stage: AuthenticatorMobileStage = self.executor.current_stage
+        self.prepare()
+        payload = AuthenticatorMobilePayloadChallenge(data={
+            # TODO: use cloud gateway?
+            "u": self.request.get_host(),
+            "s": str(stage.stage_uuid),
+            "t": self.executor.plan[FLOW_PLAN_MOBILE_ENROLL].token,
+        })
+        payload.is_valid()
         return AuthenticatorMobileChallenge(
             data={
                 "type": ChallengeTypes.NATIVE.value,
-                "authentik_url": self.request.get_host(),
-                "stage_uuid": str(stage.stage_uuid),
+                "payload": payload.validated_data,
             }
         )
 

schema.yml

@@ -30183,15 +30183,12 @@ components:
           type: string
         pending_user_avatar:
           type: string
-        authentik_url:
-          type: string
-        stage_uuid:
-          type: string
+        payload:
+          $ref: '#/components/schemas/AuthenticatorMobilePayloadChallenge'
       required:
-      - authentik_url
+      - payload
       - pending_user
       - pending_user_avatar
-      - stage_uuid
       - type
     AuthenticatorMobileChallengeResponseRequest:
       type: object
@@ -30201,6 +30198,20 @@ components:
           type: string
           minLength: 1
           default: ak-stage-authenticator-mobile
+    AuthenticatorMobilePayloadChallenge:
+      type: object
+      description: Payload within the QR code given to the mobile app, hence the short
+        variable names
+      properties:
+        u:
+          type: string
+          description: Server URL
+        s:
+          type: string
+          description: Stage UUID
+        t:
+          type: string
+          description: Initial Token
     AuthenticatorMobileStage:
       type: object
       description: AuthenticatorMobileStage Serializer

web/src/flow/FlowExecutor.ts

@@ -338,7 +338,9 @@ export class FlowExecutor extends Interface implements StageHost {
                     .challenge=${this.challenge}
                 ></ak-stage-authenticator-duo>`;
             case "ak-stage-authenticator-mobile":
-                await import("@goauthentik/flow/stages/authenticator_mobile/AuthenticatorMobileStage");
+                await import(
+                    "@goauthentik/flow/stages/authenticator_mobile/AuthenticatorMobileStage"
+                );
                 return html`<ak-stage-authenticator-mobile
                     .host=${this as StageHost}
                     .challenge=${this.challenge}

web/src/flow/stages/authenticator_mobile/AuthenticatorMobileStage.ts

@@ -70,7 +70,7 @@ export class AuthenticatorMobileStage extends BaseStage<
                         </div>
                     </ak-form-static>
                     <div class="qr-container">
-                        <qr-code data="${JSON.stringify(this.challenge)}"></qr-code>
+                        <qr-code data="${JSON.stringify(this.challenge.payload)}"></qr-code>
                     </div>
                 </form>
             </div>