stages/authenticator_validate: implement validation, add button to go back to device picker

authentik/root/messages/storage.py

@@ -18,8 +18,6 @@ class ChannelsStorage(FallbackStorage):
     def _store(self, messages: list[Message], response, *args, **kwargs):
         prefix = f"user_{self.request.session.session_key}_messages_"
         keys = cache.keys(f"{prefix}*")
-        if len(keys) < 1:
-            return super()._store(messages, response, *args, **kwargs)
         for key in keys:
             uid = key.replace(prefix, "")
             for message in messages:
@@ -32,4 +30,3 @@ class ChannelsStorage(FallbackStorage):
                         "message": message.message,
                     },
                 )
-        return None

authentik/stages/authenticator_validate/challenge.py

@@ -17,7 +17,6 @@ from webauthn.webauthn import (
 
 from authentik.core.models import User
 from authentik.lib.templatetags.authentik_utils import avatar
-from authentik.stages.authenticator_validate.models import DeviceClasses
 from authentik.stages.authenticator_webauthn.models import WebAuthnDevice
 from authentik.stages.authenticator_webauthn.utils import generate_challenge
 
@@ -70,35 +69,19 @@ def get_webauthn_challenge(request: HttpRequest, device: WebAuthnDevice) -> dict
     return webauthn_assertion_options.assertion_dict
 
 
-def validate_challenge(
-    challenge: DeviceChallenge, request: HttpRequest, user: User
-) -> DeviceChallenge:
-    """main entry point for challenge validation"""
-    if challenge.validated_data["device_class"] in (
-        DeviceClasses.TOTP,
-        DeviceClasses.STATIC,
-    ):
-        return validate_challenge_code(challenge, request, user)
-    return validate_challenge_webauthn(challenge, request, user)
-
-
-def validate_challenge_code(
-    challenge: DeviceChallenge, request: HttpRequest, user: User
-) -> DeviceChallenge:
+def validate_challenge_code(code: str, request: HttpRequest, user: User) -> str:
     """Validate code-based challenges. We test against every device, on purpose, as
     the user mustn't choose between totp and static devices."""
-    device = match_token(user, challenge.validated_data["challenge"].get("code", None))
+    device = match_token(user, code)
     if not device:
         raise ValidationError(_("Invalid Token"))
-    return challenge
+    return code
 
 
-def validate_challenge_webauthn(
-    challenge: DeviceChallenge, request: HttpRequest, user: User
-) -> DeviceChallenge:
+def validate_challenge_webauthn(data: dict, request: HttpRequest, user: User) -> dict:
     """Validate WebAuthn Challenge"""
     challenge = request.session.get("challenge")
-    assertion_response = challenge.validated_data["challenge"]
+    assertion_response = data["challenge"]
     credential_id = assertion_response.get("id")
 
     device = WebAuthnDevice.objects.filter(credential_id=credential_id).first()
@@ -134,4 +117,4 @@ def validate_challenge_webauthn(
         raise ValidationError("Assertion failed") from exc
 
     device.set_sign_count(sign_count)
-    return challenge
+    return data

authentik/stages/authenticator_validate/stage.py

@@ -1,11 +1,10 @@
 """Authenticator Validation"""
 from django.http import HttpRequest, HttpResponse
-from django.http.request import QueryDict
 from django_otp import devices_for_user
-from rest_framework.fields import ListField
+from rest_framework.fields import CharField, JSONField, ListField
+from rest_framework.serializers import ValidationError
 from structlog.stdlib import get_logger
 
-from authentik.core.models import User
 from authentik.flows.challenge import (
     ChallengeResponse,
     ChallengeTypes,
@@ -17,15 +16,17 @@ from authentik.flows.stage import ChallengeStageView
 from authentik.stages.authenticator_validate.challenge import (
     DeviceChallenge,
     get_challenge_for_device,
-    validate_challenge,
+    validate_challenge_code,
+    validate_challenge_webauthn,
+)
+from authentik.stages.authenticator_validate.models import (
+    AuthenticatorValidateStage,
+    DeviceClasses,
 )
-from authentik.stages.authenticator_validate.models import AuthenticatorValidateStage, DeviceClasses
 
 LOGGER = get_logger()
 
-PER_DEVICE_CLASSES = [
-    DeviceClasses.WEBAUTHN
-]
+PER_DEVICE_CLASSES = [DeviceClasses.WEBAUTHN]
 
 
 class AuthenticatorChallenge(WithUserInfoChallenge):
@@ -34,15 +35,46 @@ class AuthenticatorChallenge(WithUserInfoChallenge):
     device_challenges = ListField(child=DeviceChallenge())
 
 
-class AuthenticatorChallengeResponse(ChallengeResponse, DeviceChallenge):
-    """Challenge used for Code-based authenticators"""
+class AuthenticatorChallengeResponse(ChallengeResponse):
+    """Challenge used for Code-based and WebAuthn authenticators"""
 
-    request: HttpRequest
-    user: User
+    code = CharField(required=False)
+    webauthn = JSONField(required=False)
 
-    def validate_challenge(self, value: dict):
-        """Validate response"""
-        return validate_challenge(value, self.request, self.user)
+    def validate_code(self, code: str) -> str:
+        """Validate code-based response, raise error if code isn't allowed"""
+        device_challenges: list[dict] = self.stage.request.session.get(
+            "device_challenges"
+        )
+        if not any(
+            x["device_class"] in (DeviceClasses.TOTP, DeviceClasses.STATIC)
+            for x in device_challenges
+        ):
+            raise ValidationError("Got code but no compatible device class allowed")
+        return validate_challenge_code(
+            code, self.stage.request, self.stage.get_pending_user()
+        )
+
+    def validate_webauthn(self, webauthn: dict) -> dict:
+        """Validate webauthn response, raise error if webauthn wasn't allowed
+        or response is invalid"""
+        device_challenges: list[dict] = self.stage.request.session.get(
+            "device_challenges"
+        )
+        if not any(
+            x["device_class"] in (DeviceClasses.WEBAUTHN) for x in device_challenges
+        ):
+            raise ValidationError("Got webauthn but no compatible device class allowed")
+        return validate_challenge_webauthn(
+            webauthn, self.stage.request, self.stage.get_pending_user()
+        )
+
+    def validate(self, data: dict):
+        # Checking if the given data is from a valid device class is done above
+        # Here we only check if the any data was sent at all
+        if "code" not in data and "webauthn" not in data:
+            raise ValidationError("Empty response")
+        return data
 
 
 class AuthenticatorValidateStageView(ChallengeStageView):
@@ -51,6 +83,7 @@ class AuthenticatorValidateStageView(ChallengeStageView):
     response_class = AuthenticatorChallengeResponse
 
     def get_device_challenges(self) -> list[dict]:
+        """Get a list of all device challenges applicable for the current stage"""
         challenges = []
         user_devices = devices_for_user(self.get_pending_user())
 
@@ -112,14 +145,9 @@ class AuthenticatorValidateStageView(ChallengeStageView):
             }
         )
 
-    def get_response_instance(self, data: QueryDict) -> ChallengeResponse:
-        response: AuthenticatorChallengeResponse = super().get_response_instance(data)
-        response.request = self.request
-        response.user = self.get_pending_user()
-        return response
-
+    # pylint: disable=unused-argument
     def challenge_valid(
         self, challenge: AuthenticatorChallengeResponse
     ) -> HttpResponse:
-        print(challenge)
-        return HttpResponse()
+        # All validation is done by the serializer
+        return self.executor.stage_ok()

authentik/stages/authenticator_webauthn/stage.py

@@ -18,7 +18,11 @@ from authentik.flows.planner import PLAN_CONTEXT_PENDING_USER
 from authentik.flows.stage import ChallengeStageView
 from authentik.lib.templatetags.authentik_utils import avatar
 from authentik.stages.authenticator_webauthn.models import WebAuthnDevice
-from authentik.stages.authenticator_webauthn.utils import generate_challenge, get_origin, get_rp_id
+from authentik.stages.authenticator_webauthn.utils import (
+    generate_challenge,
+    get_origin,
+    get_rp_id,
+)
 
 RP_NAME = "authentik"
 

authentik/stages/authenticator_webauthn/utils.py

@@ -1,6 +1,7 @@
 """webauthn utils"""
 import base64
 import os
+
 from django.http import HttpRequest
 
 CHALLENGE_DEFAULT_BYTE_LEN = 32
@@ -23,6 +24,7 @@ def generate_challenge(challenge_len=CHALLENGE_DEFAULT_BYTE_LEN):
         challenge_base64 = challenge_base64.decode("utf-8")
     return challenge_base64
 
+
 def get_rp_id(request: HttpRequest) -> str:
     """Get hostname from http request, without port"""
     host = request.get_host()
@@ -30,6 +32,7 @@ def get_rp_id(request: HttpRequest) -> str:
         return host.split(":")[0]
     return host
 
+
 def get_origin(request: HttpRequest) -> str:
     """Return Origin by building an absolute URL and removing the
     trailing slash"""

web/src/elements/stages/authenticator_validate/AuthenticatorValidateStage.ts

@@ -23,7 +23,8 @@ export interface AuthenticatorValidateStageChallenge extends WithUserInfoChallen
 }
 
 export interface AuthenticatorValidateStageChallengeResponse {
-    response: DeviceChallenge;
+    code: string;
+    webauthn: string;
 }
 
 @customElement("ak-stage-authenticator-validate")
@@ -145,13 +146,15 @@ export class AuthenticatorValidateStage extends BaseStage implements StageHost {
                     ${gettext("Select an identification method.")}
                     </p>`}
             </header>
-            <div class="pf-c-login__main-body">
-                ${this.selectedDeviceChallenge ? this.renderDeviceChallenge() : this.renderDevicePicker()}
-            </div>
-            <footer class="pf-c-login__main-footer">
-                <ul class="pf-c-login__main-footer-links">
-                </ul>
-            </footer>`;
+            ${this.selectedDeviceChallenge ?
+                this.renderDeviceChallenge() :
+                html`<div class="pf-c-login__main-body">
+                    ${this.renderDevicePicker()}
+                </div>
+                <footer class="pf-c-login__main-footer">
+                    <ul class="pf-c-login__main-footer-links">
+                    </ul>
+                </footer>`}`;
     }
 
 }

web/src/elements/stages/authenticator_validate/AuthenticatorValidateStageCode.ts

@@ -2,7 +2,8 @@ import { gettext } from "django";
 import { CSSResult, customElement, html, property, TemplateResult } from "lit-element";
 import { COMMON_STYLES } from "../../../common/styles";
 import { BaseStage } from "../base";
-import { AuthenticatorValidateStageChallenge, DeviceChallenge } from "./AuthenticatorValidateStage";
+import { AuthenticatorValidateStage, AuthenticatorValidateStageChallenge, DeviceChallenge } from "./AuthenticatorValidateStage";
+import "../form";
 
 @customElement("ak-stage-authenticator-validate-code")
 export class AuthenticatorValidateStageWebCode extends BaseStage {
@@ -21,44 +22,55 @@ export class AuthenticatorValidateStageWebCode extends BaseStage {
         if (!this.challenge) {
             return html`<ak-loading-state></ak-loading-state>`;
         }
-        return html`<form class="pf-c-form" @submit=${(e: Event) => { this.submitForm(e); }}>
-                    <div class="pf-c-form__group">
-                        <div class="form-control-static">
-                            <div class="left">
-                                <img class="pf-c-avatar" src="${this.challenge.pending_user_avatar}" alt="${gettext("User's avatar")}">
-                                ${this.challenge.pending_user}
-                            </div>
-                            <div class="right">
-                                <a href="/flows/-/cancel/">${gettext("Not you?")}</a>
-                            </div>
+        return html`<div class="pf-c-login__main-body">
+            <form class="pf-c-form" @submit=${(e: Event) => { this.submitForm(e); }}>
+                <div class="pf-c-form__group">
+                    <div class="form-control-static">
+                        <div class="left">
+                            <img class="pf-c-avatar" src="${this.challenge.pending_user_avatar}" alt="${gettext("User's avatar")}">
+                            ${this.challenge.pending_user}
+                        </div>
+                        <div class="right">
+                            <a href="/flows/-/cancel/">${gettext("Not you?")}</a>
                         </div>
                     </div>
-                    <input type="hidden" name="device_class" value=${this.deviceChallenge?.device_class}>
-                    <input type="hidden" name="device_uid" value=${this.deviceChallenge?.device_uid}>
+                </div>
+                <ak-form-element
+                    label="${gettext("Code")}"
+                    ?required="${true}"
+                    class="pf-c-form__group"
+                    .errors=${(this.challenge?.response_errors || {})["code"]}>
+                    <!-- @ts-ignore -->
+                    <input type="text"
+                        name="code"
+                        inputmode="numeric"
+                        pattern="[0-9]*"
+                        placeholder="${gettext("Please enter your TOTP Code")}"
+                        autofocus=""
+                        autocomplete="one-time-code"
+                        class="pf-c-form-control"
+                        required="">
+                </ak-form-element>
 
-                    <ak-form-element
-                        label="${gettext("Code")}"
-                        ?required="${true}"
-                        class="pf-c-form__group"
-                        .errors=${(this.challenge?.response_errors || {})["code"]}>
-                        <!-- @ts-ignore -->
-                        <input type="text"
-                            name="challenge"
-                            inputmode="numeric"
-                            pattern="[0-9]*"
-                            placeholder="${gettext("Please enter your TOTP Code")}"
-                            autofocus=""
-                            autocomplete="one-time-code"
-                            class="pf-c-form-control"
-                            required="">
-                    </ak-form-element>
-
-                    <div class="pf-c-form__group pf-m-action">
-                        <button type="submit" class="pf-c-button pf-m-primary pf-m-block">
-                            ${gettext("Continue")}
-                        </button>
-                    </div>
-                </form>`;
+                <div class="pf-c-form__group pf-m-action">
+                    <button type="submit" class="pf-c-button pf-m-primary pf-m-block">
+                        ${gettext("Continue")}
+                    </button>
+                </div>
+            </form>
+        </div>
+        <footer class="pf-c-login__main-footer">
+            <ul class="pf-c-login__main-footer-links">
+                <li class="pf-c-login__main-footer-links-item">
+                    <button class="pf-c-button pf-m-secondary pf-m-block" @click=${() => {
+                        if (!this.host) return;
+                        (this.host as AuthenticatorValidateStage).selectedDeviceChallenge = undefined;
+                    }}>
+                        ${gettext("Return to device picker")}
+                    </button>
+                </li>
+            </ul>
+        </footer>`;
     }
 
 }

web/src/elements/stages/authenticator_validate/AuthenticatorValidateStageWebAuthn.ts

@@ -1,9 +1,10 @@
 import { gettext } from "django";
-import { customElement, html, property, TemplateResult } from "lit-element";
+import { CSSResult, customElement, html, property, TemplateResult } from "lit-element";
+import { COMMON_STYLES } from "../../../common/styles";
 import { SpinnerSize } from "../../Spinner";
 import { transformAssertionForServer, transformCredentialRequestOptions } from "../authenticator_webauthn/utils";
 import { BaseStage } from "../base";
-import { AuthenticatorValidateStageChallenge, DeviceChallenge } from "./AuthenticatorValidateStage";
+import { AuthenticatorValidateStage, AuthenticatorValidateStageChallenge, DeviceChallenge } from "./AuthenticatorValidateStage";
 
 @customElement("ak-stage-authenticator-validate-webauthn")
 export class AuthenticatorValidateStageWebAuthn extends BaseStage {
@@ -20,6 +21,10 @@ export class AuthenticatorValidateStageWebAuthn extends BaseStage {
     @property()
     authenticateMessage = "";
 
+    static get styles(): CSSResult[] {
+        return COMMON_STYLES;
+    }
+
     async authenticate(): Promise<void> {
         // convert certain members of the PublicKeyCredentialRequestOptions into
         // byte arrays as expected by the spec.
@@ -47,11 +52,7 @@ export class AuthenticatorValidateStageWebAuthn extends BaseStage {
         // post the assertion to the server for verification.
         try {
             const formData = new FormData();
-            formData.set("response", JSON.stringify(<DeviceChallenge>{
-                device_class: this.deviceChallenge?.device_class,
-                device_uid: this.deviceChallenge?.device_uid,
-                challenge: transformedAssertionForServer,
-            }));
+            formData.set("webauthn", JSON.stringify(transformedAssertionForServer));
             await this.host?.submit(formData);
         } catch (err) {
             throw new Error(gettext(`Error when validating assertion on server: ${err}`));
@@ -76,7 +77,7 @@ export class AuthenticatorValidateStageWebAuthn extends BaseStage {
     }
 
     render(): TemplateResult {
-        return html`<div class="">
+        return html`<div class="pf-c-login__main-body">
             ${this.authenticateRunning ?
                 html`<div class="pf-c-empty-state__content">
                         <div class="pf-l-bullseye">
@@ -94,7 +95,19 @@ export class AuthenticatorValidateStageWebAuthn extends BaseStage {
                         ${gettext("Retry authentication")}
                     </button>
                 </div>`}
-        </div>`;
+        </div>
+        <footer class="pf-c-login__main-footer">
+            <ul class="pf-c-login__main-footer-links">
+                <li class="pf-c-login__main-footer-links-item">
+                    <button class="pf-c-button pf-m-secondary pf-m-block" @click=${() => {
+                        if (!this.host) return;
+                        (this.host as AuthenticatorValidateStage).selectedDeviceChallenge = undefined;
+                    }}>
+                        ${gettext("Return to device picker")}
+                    </button>
+                </li>
+            </ul>
+        </footer>`;
     }
 
 }