traefik/docs/content/middlewares/forwardauth.md

ForwardAuth

Using an External Service to Check for Credentials {: .subtitle }

The ForwardAuth middleware delegate the authentication to an external service. If the service response code is 2XX, access is granted and the original request is performed. Otherwise, the response from the authentication server is returned.

Configuration Examples

# Forward authentication to example.com
labels:
  - "traefik.http.middlewares.test-auth.forwardauth.address=https://example.com/auth"

# Forward authentication to example.com
apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
  name: test-auth
spec:
  forwardAuth:
    address: https://example.com/auth

# Forward authentication to example.com
- "traefik.http.middlewares.test-auth.forwardauth.address=https://example.com/auth"

"labels": {
  "traefik.http.middlewares.test-auth.forwardauth.address": "https://example.com/auth"
}

# Forward authentication to example.com
labels:
  - "traefik.http.middlewares.test-auth.forwardauth.address=https://example.com/auth"

# Forward authentication to example.com
[http.middlewares]
  [http.middlewares.test-auth.forwardAuth]
    address = "https://example.com/auth"

# Forward authentication to example.com
http:
  middlewares:
    test-auth:
      forwardAuth:
        address: "https://example.com/auth"

Forward-Request Headers

The following request properties are provided to the forward-auth target endpoint as X-Forwarded- headers.

Property	Forward-Request Header
HTTP Method	X-Forwarded-Method
Protocol	X-Forwarded-Proto
Host	X-Forwarded-Host
Request URI	X-Forwarded-Uri
Source IP-Address	X-Forwarded-For

Configuration Options

address

The address option defines the authentication server address.

labels:
  - "traefik.http.middlewares.test-auth.forwardauth.address=https://example.com/auth"

apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
  name: test-auth
spec:
  forwardAuth:
    address: https://example.com/auth 

- "traefik.http.middlewares.test-auth.forwardauth.address=https://example.com/auth"

"labels": {
  "traefik.http.middlewares.test-auth.forwardauth.address": "https://example.com/auth"
}

labels:
  - "traefik.http.middlewares.test-auth.forwardauth.address=https://example.com/auth"

[http.middlewares]
  [http.middlewares.test-auth.forwardAuth]
    address = "https://example.com/auth"

http:
  middlewares:
    test-auth:
      forwardAuth:
        address: "https://example.com/auth"

trustForwardHeader

Set the trustForwardHeader option to true to trust all the existing X-Forwarded-* headers.

labels:
  - "traefik.http.middlewares.test-auth.forwardauth.trustForwardHeader=true"

apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
  name: test-auth
spec:
  forwardAuth:
    address: https://example.com/auth
    trustForwardHeader: true

- "traefik.http.middlewares.test-auth.forwardauth.trustForwardHeader=true"

"labels": {
  "traefik.http.middlewares.test-auth.forwardauth.trustForwardHeader": "true"
}

labels:
  - "traefik.http.middlewares.test-auth.forwardauth.trustForwardHeader=true"

[http.middlewares]
  [http.middlewares.test-auth.forwardAuth]
    address = "https://example.com/auth"
    trustForwardHeader = true

http:
  middlewares:
    test-auth:
      forwardAuth:
        address: "https://example.com/auth"
        trustForwardHeader: true

authResponseHeaders

The authResponseHeaders option is the list of the headers to copy from the authentication server to the request. All incoming request's headers in this list are deleted from the request before any copy happens.

labels:
  - "traefik.http.middlewares.test-auth.forwardauth.authResponseHeaders=X-Auth-User, X-Secret"

apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
  name: test-auth
spec:
  forwardAuth:
    address: https://example.com/auth
    authResponseHeaders:
      - X-Auth-User
      - X-Secret

- "traefik.http.middlewares.test-auth.forwardauth.authResponseHeaders=X-Auth-User, X-Secret"

"labels": {
  "traefik.http.middlewares.test-auth.forwardauth.authResponseHeaders": "X-Auth-User,X-Secret"
}

labels:
  - "traefik.http.middlewares.test-auth.forwardauth.authResponseHeaders=X-Auth-User, X-Secret"

[http.middlewares]
  [http.middlewares.test-auth.forwardAuth]
    address = "https://example.com/auth"
    authResponseHeaders = ["X-Auth-User", "X-Secret"]

http:
  middlewares:
    test-auth:
      forwardAuth:
        address: "https://example.com/auth"
        authResponseHeaders:
          - "X-Auth-User"
          - "X-Secret"

authResponseHeadersRegex

The authResponseHeadersRegex option is the regex to match the headers that should be copied from the authentication server to the request. All incoming request's headers matching this regex are deleted from the request before any copy happens. It allows partial matching of the regular expression against the header's key. You should use start of string (^) and end of string ($) anchors to ensure a full match against the header's key.

labels:
  - "traefik.http.middlewares.test-auth.forwardauth.authResponseHeadersRegex=^X-"

apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
  name: test-auth
spec:
  forwardAuth:
    address: https://example.com/auth
    authResponseHeadersRegex: ^X-

- "traefik.http.middlewares.test-auth.forwardauth.authResponseHeadersRegex=^X-"

"labels": {
  "traefik.http.middlewares.test-auth.forwardauth.authResponseHeadersRegex": "^X-"
}

labels:
  - "traefik.http.middlewares.test-auth.forwardauth.authResponseHeadersRegex=^X-"

[http.middlewares]
  [http.middlewares.test-auth.forwardAuth]
    address = "https://example.com/auth"
    authResponseHeadersRegex = "^X-"

http:
  middlewares:
    test-auth:
      forwardAuth:
        address: "https://example.com/auth"
        authResponseHeadersRegex: "^X-"

authRequestHeaders

The authRequestHeaders option is the list of the headers to copy from the request to the authentication server. It allows to prevent passing headers that have not to be passed to the authentication server. If not set or empty then all request headers will be passed.

labels:
  - "traefik.http.middlewares.test-auth.forwardauth.authRequestHeaders=Accept,X-CustomHeader"

apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
  name: test-auth
spec:
  forwardAuth:
    address: https://example.com/auth
    authRequestHeaders:
      - "Accept"
      - "X-CustomHeader"

- "traefik.http.middlewares.test-auth.forwardauth.authRequestHeaders=Accept,X-CustomHeader"

"labels": {
  "traefik.http.middlewares.test-auth.forwardauth.authRequestHeaders": "Accept,X-CustomHeader"
}

labels:
  - "traefik.http.middlewares.test-auth.forwardauth.authRequestHeaders=Accept,X-CustomHeader"

[http.middlewares]
  [http.middlewares.test-auth.forwardAuth]
    address = "https://example.com/auth"
    authRequestHeaders = "Accept,X-CustomHeader"

http:
  middlewares:
    test-auth:
      forwardAuth:
        address: "https://example.com/auth"
        authRequestHeaders:
          - "Accept"
          - "X-CustomHeader"

tls

The tls option is the TLS configuration from Traefik to the authentication server.

tls.ca

Certificate Authority used for the secured connection to the authentication server.

labels:
  - "traefik.http.middlewares.test-auth.forwardauth.tls.ca=path/to/local.crt"

apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
  name: test-auth
spec:
  forwardAuth:
    address: https://example.com/auth
    tls:
      caSecret: mycasercret

---
apiVersion: v1
kind: Secret
metadata:
  name: mycasercret
  namespace: default

data:
  ca: LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0tCi0tLS0tRU5EIENFUlRJRklDQVRFLS0tLS0=

- "traefik.http.middlewares.test-auth.forwardauth.tls.ca=path/to/local.crt"

"labels": {
  "traefik.http.middlewares.test-auth.forwardauth.tls.ca": "path/to/local.crt"
}

labels:
  - "traefik.http.middlewares.test-auth.forwardauth.tls.ca=path/to/local.crt"

[http.middlewares]
  [http.middlewares.test-auth.forwardAuth]
    address = "https://example.com/auth"
    [http.middlewares.test-auth.forwardAuth.tls]
      ca = "path/to/local.crt"

http:
  middlewares:
    test-auth:
      forwardAuth:
        address: "https://example.com/auth"
        tls:
          ca: "path/to/local.crt"

tls.caOptional

Policy used for the secured connection with TLS Client Authentication to the authentication server. Requires tls.ca to be defined.

• true: VerifyClientCertIfGiven
• false: RequireAndVerifyClientCert
• if tls.ca is undefined NoClientCert

labels:
  - "traefik.http.middlewares.test-auth.forwardauth.tls.caOptional=true"

apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
  name: test-auth
spec:
  forwardAuth:
    address: https://example.com/auth
    tls:
      caOptional: true

- "traefik.http.middlewares.test-auth.forwardauth.tls.caOptional=true"

"labels": {
  "traefik.http.middlewares.test-auth.forwardauth.tls.caOptional": "true"
}

labels:
  - "traefik.http.middlewares.test-auth.forwardauth.tls.caOptional=true"

[http.middlewares]
  [http.middlewares.test-auth.forwardAuth]
    address = "https://example.com/auth"
    [http.middlewares.test-auth.forwardAuth.tls]
      caOptional = true

http:
  middlewares:
    test-auth:
      forwardAuth:
        address: "https://example.com/auth"
        tls:
          caOptional: true

tls.cert

Public certificate used for the secured connection to the authentication server.

labels:
  - "traefik.http.middlewares.test-auth.forwardauth.tls.cert=path/to/foo.cert"
  - "traefik.http.middlewares.test-auth.forwardauth.tls.key=path/to/foo.key"

apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
  name: test-auth
spec:
  forwardAuth:
    address: https://example.com/auth
    tls:
      certSecret: mytlscert

---
apiVersion: v1
kind: Secret
metadata:
  name: mytlscert
  namespace: default

data:
  tls.crt: LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0tCi0tLS0tRU5EIENFUlRJRklDQVRFLS0tLS0=
  tls.key: LS0tLS1CRUdJTiBQUklWQVRFIEtFWS0tLS0tCi0tLS0tRU5EIFBSSVZBVEUgS0VZLS0tLS0=

- "traefik.http.middlewares.test-auth.forwardauth.tls.cert=path/to/foo.cert"
- "traefik.http.middlewares.test-auth.forwardauth.tls.key=path/to/foo.key"

"labels": {
  "traefik.http.middlewares.test-auth.forwardauth.tls.cert": "path/to/foo.cert",
  "traefik.http.middlewares.test-auth.forwardauth.tls.key": "path/to/foo.key"
}

labels:
  - "traefik.http.middlewares.test-auth.forwardauth.tls.cert=path/to/foo.cert"
  - "traefik.http.middlewares.test-auth.forwardauth.tls.key=path/to/foo.key"

[http.middlewares]
  [http.middlewares.test-auth.forwardAuth]
    address = "https://example.com/auth"
    [http.middlewares.test-auth.forwardAuth.tls]
      cert = "path/to/foo.cert"
      key = "path/to/foo.key"

http:
  middlewares:
    test-auth:
      forwardAuth:
        address: "https://example.com/auth"
        tls:
          cert: "path/to/foo.cert"
          key: "path/to/foo.key"

!!! info For security reasons, the field doesn't exist for Kubernetes IngressRoute, and one should use the secret field instead.

tls.key

Private certificate used for the secure connection to the authentication server.

labels:
  - "traefik.http.middlewares.test-auth.forwardauth.tls.cert=path/to/foo.cert"
  - "traefik.http.middlewares.test-auth.forwardauth.tls.key=path/to/foo.key"

apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
  name: test-auth
spec:
  forwardAuth:
    address: https://example.com/auth
    tls:
      certSecret: mytlscert

---
apiVersion: v1
kind: Secret
metadata:
  name: mytlscert
  namespace: default

data:
  tls.crt: LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0tCi0tLS0tRU5EIENFUlRJRklDQVRFLS0tLS0=
  tls.key: LS0tLS1CRUdJTiBQUklWQVRFIEtFWS0tLS0tCi0tLS0tRU5EIFBSSVZBVEUgS0VZLS0tLS0=

- "traefik.http.middlewares.test-auth.forwardauth.tls.cert=path/to/foo.cert"
- "traefik.http.middlewares.test-auth.forwardauth.tls.key=path/to/foo.key"

"labels": {
  "traefik.http.middlewares.test-auth.forwardauth.tls.cert": "path/to/foo.cert",
  "traefik.http.middlewares.test-auth.forwardauth.tls.key": "path/to/foo.key"
}

labels:
  - "traefik.http.middlewares.test-auth.forwardauth.tls.cert=path/to/foo.cert"
  - "traefik.http.middlewares.test-auth.forwardauth.tls.key=path/to/foo.key"

[http.middlewares]
  [http.middlewares.test-auth.forwardAuth]
    address = "https://example.com/auth"
    [http.middlewares.test-auth.forwardAuth.tls]
      cert = "path/to/foo.cert"
      key = "path/to/foo.key"

http:
  middlewares:
    test-auth:
      forwardAuth:
        address: "https://example.com/auth"
        tls:
          cert: "path/to/foo.cert"
          key: "path/to/foo.key"

!!! info For security reasons, the field doesn't exist for Kubernetes IngressRoute, and one should use the secret field instead.

tls.insecureSkipVerify

If insecureSkipVerify is true, TLS for the connection to authentication server accepts any certificate presented by the server and any host name in that certificate.

labels:
  - "traefik.http.middlewares.test-auth.forwardauth.tls.insecureSkipVerify=true"

apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
  name: test-auth
spec:
  forwardAuth:
    address: https://example.com/auth
    tls:
      insecureSkipVerify: true

- "traefik.http.middlewares.test-auth.forwardauth.tls.InsecureSkipVerify=true"

"labels": {
  "traefik.http.middlewares.test-auth.forwardauth.tls.insecureSkipVerify": "true"
}

labels:
  - "traefik.http.middlewares.test-auth.forwardauth.tls.InsecureSkipVerify=true"

[http.middlewares]
  [http.middlewares.test-auth.forwardAuth]
    address = "https://example.com/auth"
    [http.middlewares.test-auth.forwardAuth.tls]
      insecureSkipVerify: true

http:
  middlewares:
    test-auth:
      forwardAuth:
        address: "https://example.com/auth"
        tls:
          insecureSkipVerify: true