Trusted IP's broken...?

[IngwiePhoenix]

Hello there!

I have been trying to make IP whitelisting work, but have not been successful.

Here is the whole deployment:

apiVersion: v1
kind: Namespace
metadata:
  name: traefik-auth
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: auth-cm
  namespace: traefik-auth
data:
  TRUSTED_IP_ADDRESS: 192.168.1.0/24,100.64.0.0/24
  AUTH_HOST: auth.birb.it
  COOKIE_DOMAIN: birb.it
  LOG_LEVEL: debug
  LOG_FORMAT: pretty
---
apiVersion: v1
kind: Secret
metadata:
  name: oidc-creds
  namespace: traefik-auth
type: Opaque
stringData:
  DEFAULT_PROVIDER: oidc
  SECRET: <snip>
  PROVIDERS_OIDC_ISSUER_URL: https://keycloak.birb.it/realms/master
  PROVIDERS_OIDC_CLIENT_ID: <snip>
  PROVIDERS_OIDC_CLIENT_SECRET: <snip>
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: auth-app
  namespace: traefik-auth
  labels:
    app: traefik-forward-auth
spec:
  replicas: 1
  selector:
    matchLabels:
      app: traefik-forward-auth
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: traefik-forward-auth
    spec:
      terminationGracePeriodSeconds: 60
      containers:
        - name: app
          image: thomseddon/traefik-forward-auth:2-arm64
          args:
            - --rule.homelab.action=allow
            - --rule.homelab.rule=ClientIP(`192.168.1.0/24`)
          ports:
            - containerPort: 4181
              protocol: TCP
          envFrom:
            - secretRef:
                name: oidc-creds
            - configMapRef:
                name: auth-cm
---
apiVersion: v1
kind: Service
metadata:
  name: auth-svc
  namespace: traefik-auth
  labels:
    app: traefik-forward-auth
spec:
  type: ClusterIP
  selector:
    app: traefik-forward-auth
  ports:
  - name: auth-http
    port: 4181
    targetPort: 4181
---
apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
  name: auth-trm
  namespace: traefik-auth
spec:
  forwardAuth:
    # workaround; traefik's dns ignores search domains...
    address: http://auth-svc.traefik-auth.svc.kube.birb.it:4181
    trustForwardHeader: true
    authResponseHeaders:
      - X-Forwarded-User
---
apiVersion: traefik.io/v1alpha1
kind: IngressRoute
metadata:
  name: auth-ir
  namespace: traefik-auth
spec:
  entryPoints:
    - websecure
  routes:
    - match: Host(`auth.birb.it`)
      kind: Rule
      services:
        - name: auth-svc
          port: auth-http
          #passHostHeader: true
          #scheme: http

In the logs, I can see the request arriving and even showing the correct IP; and yet, it yeets the request to Keycloak.

time="2024-05-12T17:26:59Z" level=debug msg="Authenticating request" cookies="[]" handler=Auth host=router.birb.it method=GET proto=https rule=default source_ip=192.168.1.4 uri=/
time="2024-05-12T17:26:59Z" level=debug msg="Set CSRF cookie and redirected to provider login url" csrf_cookie="_forward_auth_csrf=c5dd67ee78e3fa4c824dca83a41b3f2c; Path=/; Domain=birb.it; Expires=Mon, 13 May 2024 05:26:59 GMT; HttpOnly; Secure" handler=Auth host=router.birb.it login_url="https://keycloak.birb.it/realms/master/(...snip...)" method=GET proto=https rule=default source_ip=192.168.1.4 uri=/

The "homelab" Rule I tried to use, gets completely ignored (but is loaded), and the initial config object being printed also does not seem to include the IP whitelist, too.

{
  "LogLevel": "debug",
  "LogFormat": "pretty",
  "AuthHost": "auth.birb.it",
  "CookieDomains": [
    {
      "Domain": "birb.it",
      "DomainLen": 7,
      "SubDomain": ".birb.it",
      "SubDomainLen": 8
    }
  ],
  "InsecureCookie": false,
  "CookieName": "_forward_auth",
  "CSRFCookieName": "_forward_auth_csrf",
  "DefaultAction": "auth",
  "DefaultProvider": "oidc",
  "Domains": null,
  "LifetimeString": 43200,
  "LogoutRedirect": "",
  "MatchWhitelistOrDomain": false,
  "Path": "/_oauth",
  "Whitelist": null,
  "Providers": {
    "Google": {
      "ClientID": "",
      "Scope": "",
      "Prompt": "select_account",
      "LoginURL": null,
      "TokenURL": null,
      "UserURL": null
    },
    "OIDC": {
      "IssuerURL": "https://keycloak.birb.it/realms/master",
      "ClientID": "/* snip */",
      "Resource": "",
      "Config": { /* snip */ },
        "RedirectURL": "",
        "Scopes": [
          "openid",
          "profile",
          "email"
        ]
      }
    },
    "GenericOAuth": {
      "AuthURL": "",
      "TokenURL": "",
      "UserURL": "",
      "ClientID": "",
      "Scopes": [
        "profile",
        "email"
      ],
      "TokenStyle": "header",
      "Resource": "",
      "Config": null
    }
  },
  "Rules": {
    "homelab": {
      "Action": "allow",
      "Rule": "ClientIP(`192.168.1.0/24`)",
      "Provider": "oidc"
    }
  },
  "Lifetime": 43200000000000,
  "CookieDomainsLegacy": null,
  "CookieSecureLegacy": "",
  "ClientIdLegacy": "",
  "PromptLegacy": ""
}

Is there anything else I missed?

Thanks and kind regards,
Ingwie