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# External authentication, authentication service response headers propagation

This example demonstrates propagation of selected authentication service response headers to backend service.

Sample configuration includes:

- Sample authentication service producing several response headers
- Authentication logic is based on HTTP header: requests with header `User` containing string `internal` are considered authenticated
- After successful authentication service generates response headers `UserID` and `UserRole`
- Sample echo service displaying header information
- Two ingress objects pointing to echo service
- Public, which allows access from unauthenticated users
- Private, which allows access from authenticated users only

You can deploy the controller as follows:

    $ kubectl create -f deploy/
    deployment "demo-auth-service" created
    service "demo-auth-service" created
    ingress "demo-auth-service" created
    deployment "demo-echo-service" created
    service "demo-echo-service" created
    ingress "public-demo-echo-service" created
    ingress "secure-demo-echo-service" created

    $ kubectl get po
    NAME                                        READY     STATUS    RESTARTS   AGE
    demo-auth-service-2769076528-7g9mh          1/1       Running            0          30s
    demo-echo-service-3636052215-3vw8c          1/1       Running            0          29s

    kubectl get ing
    NAME                       HOSTS                                 ADDRESS   PORTS     AGE
    public-demo-echo-service   public-demo-echo-service.kube.local             80        1m
    secure-demo-echo-service   secure-demo-echo-service.kube.local             80        1m

Test 1: public service with no auth header

    $ curl -H 'Host: public-demo-echo-service.kube.local' -v 192.168.99.100
    * Rebuilt URL to: 192.168.99.100/
    *   Trying 192.168.99.100...
    * Connected to 192.168.99.100 (192.168.99.100) port 80 (#0)
    > GET / HTTP/1.1
    > Host: public-demo-echo-service.kube.local
    > User-Agent: curl/7.43.0
    > Accept: */*
    >
    < HTTP/1.1 200 OK
    < Server: nginx/1.11.10
    < Date: Mon, 13 Mar 2017 20:19:21 GMT
    < Content-Type: text/plain; charset=utf-8
    < Content-Length: 20
    < Connection: keep-alive
    <
    * Connection #0 to host 192.168.99.100 left intact
    UserID: , UserRole:

Test 2: secure service with no auth header

    $ curl -H 'Host: secure-demo-echo-service.kube.local' -v 192.168.99.100
    * Rebuilt URL to: 192.168.99.100/
    *   Trying 192.168.99.100...
    * Connected to 192.168.99.100 (192.168.99.100) port 80 (#0)
    > GET / HTTP/1.1
    > Host: secure-demo-echo-service.kube.local
    > User-Agent: curl/7.43.0
    > Accept: */*
    >
    < HTTP/1.1 403 Forbidden
    < Server: nginx/1.11.10
    < Date: Mon, 13 Mar 2017 20:18:48 GMT
    < Content-Type: text/html
    < Content-Length: 170
    < Connection: keep-alive
    <
    <html>
    <head><title>403 Forbidden</title></head>
    <body bgcolor="white">
    <center><h1>403 Forbidden</h1></center>
    <hr><center>nginx/1.11.10</center>
    </body>
    </html>
    * Connection #0 to host 192.168.99.100 left intact

Test 3: public service with valid auth header

    $ curl -H 'Host: public-demo-echo-service.kube.local' -H 'User:internal' -v 192.168.99.100
    * Rebuilt URL to: 192.168.99.100/
    *   Trying 192.168.99.100...
    * Connected to 192.168.99.100 (192.168.99.100) port 80 (#0)
    > GET / HTTP/1.1
    > Host: public-demo-echo-service.kube.local
    > User-Agent: curl/7.43.0
    > Accept: */*
    > User:internal
    >
    < HTTP/1.1 200 OK
    < Server: nginx/1.11.10
    < Date: Mon, 13 Mar 2017 20:19:59 GMT
    < Content-Type: text/plain; charset=utf-8
    < Content-Length: 44
    < Connection: keep-alive
    <
    * Connection #0 to host 192.168.99.100 left intact
    UserID: 1443635317331776148, UserRole: admin

Test 4: secure service with valid auth header

    $ curl -H 'Host: secure-demo-echo-service.kube.local' -H 'User:internal' -v 192.168.99.100
    * Rebuilt URL to: 192.168.99.100/
    *   Trying 192.168.99.100...
    * Connected to 192.168.99.100 (192.168.99.100) port 80 (#0)
    > GET / HTTP/1.1
    > Host: secure-demo-echo-service.kube.local
    > User-Agent: curl/7.43.0
    > Accept: */*
    > User:internal
    >
    < HTTP/1.1 200 OK
    < Server: nginx/1.11.10
    < Date: Mon, 13 Mar 2017 20:17:23 GMT
    < Content-Type: text/plain; charset=utf-8
    < Content-Length: 43
    < Connection: keep-alive
    <
    * Connection #0 to host 192.168.99.100 left intact
    UserID: 605394647632969758, UserRole: admin