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External authentication

Example 1:

Use an external service (Basic Auth) located in https://httpbin.org

$ kubectl create -f ingress.yaml
ingress "external-auth" created

$ kubectl get ing external-auth
NAME            HOSTS                         ADDRESS       PORTS     AGE
external-auth   external-auth-01.sample.com   172.17.4.99   80        13s

$ kubectl get ing external-auth -o yaml
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    nginx.ingress.kubernetes.io/auth-url: https://httpbin.org/basic-auth/user/passwd
  creationTimestamp: 2016-10-03T13:50:35Z
  generation: 1
  name: external-auth
  namespace: default
  resourceVersion: "2068378"
  selfLink: /apis/extensions/v1beta1/namespaces/default/ingresses/external-auth
  uid: 5c388f1d-8970-11e6-9004-080027d2dc94
spec:
  rules:
  - host: external-auth-01.sample.com
    http:
      paths:
      - backend:
          serviceName: http-svc
          servicePort: 80
        path: /
status:
  loadBalancer:
    ingress:
    - ip: 172.17.4.99
$

Test 1: no username/password (expect code 401)

$ curl -k http://172.17.4.99 -v -H 'Host: external-auth-01.sample.com'
* Rebuilt URL to: http://172.17.4.99/
*   Trying 172.17.4.99...
* Connected to 172.17.4.99 (172.17.4.99) port 80 (#0)
> GET / HTTP/1.1
> Host: external-auth-01.sample.com
> User-Agent: curl/7.50.1
> Accept: */*
>
< HTTP/1.1 401 Unauthorized
< Server: nginx/1.11.3
< Date: Mon, 03 Oct 2016 14:52:08 GMT
< Content-Type: text/html
< Content-Length: 195
< Connection: keep-alive
< WWW-Authenticate: Basic realm="Fake Realm"
<
<html>
<head><title>401 Authorization Required</title></head>
<body bgcolor="white">
<center><h1>401 Authorization Required</h1></center>
<hr><center>nginx/1.11.3</center>
</body>
</html>
* Connection #0 to host 172.17.4.99 left intact

Test 2: valid username/password (expect code 200)

$ curl -k http://172.17.4.99 -v -H 'Host: external-auth-01.sample.com' -u 'user:passwd'
* Rebuilt URL to: http://172.17.4.99/
*   Trying 172.17.4.99...
* Connected to 172.17.4.99 (172.17.4.99) port 80 (#0)
* Server auth using Basic with user 'user'
> GET / HTTP/1.1
> Host: external-auth-01.sample.com
> Authorization: Basic dXNlcjpwYXNzd2Q=
> User-Agent: curl/7.50.1
> Accept: */*
>
< HTTP/1.1 200 OK
< Server: nginx/1.11.3
< Date: Mon, 03 Oct 2016 14:52:50 GMT
< Content-Type: text/plain
< Transfer-Encoding: chunked
< Connection: keep-alive
<
CLIENT VALUES:
client_address=10.2.60.2
command=GET
real path=/
query=nil
request_version=1.1
request_uri=http://external-auth-01.sample.com:8080/

SERVER VALUES:
server_version=nginx: 1.9.11 - lua: 10001

HEADERS RECEIVED:
accept=*/*
authorization=Basic dXNlcjpwYXNzd2Q=
connection=close
host=external-auth-01.sample.com
user-agent=curl/7.50.1
x-forwarded-for=10.2.60.1
x-forwarded-host=external-auth-01.sample.com
x-forwarded-port=80
x-forwarded-proto=http
x-real-ip=10.2.60.1
BODY:
* Connection #0 to host 172.17.4.99 left intact
-no body in request-

Test 3: invalid username/password (expect code 401)

curl -k http://172.17.4.99 -v -H 'Host: external-auth-01.sample.com' -u 'user:user'
* Rebuilt URL to: http://172.17.4.99/
*   Trying 172.17.4.99...
* Connected to 172.17.4.99 (172.17.4.99) port 80 (#0)
* Server auth using Basic with user 'user'
> GET / HTTP/1.1
> Host: external-auth-01.sample.com
> Authorization: Basic dXNlcjp1c2Vy
> User-Agent: curl/7.50.1
> Accept: */*
>
< HTTP/1.1 401 Unauthorized
< Server: nginx/1.11.3
< Date: Mon, 03 Oct 2016 14:53:04 GMT
< Content-Type: text/html
< Content-Length: 195
< Connection: keep-alive
* Authentication problem. Ignoring this.
< WWW-Authenticate: Basic realm="Fake Realm"
<
<html>
<head><title>401 Authorization Required</title></head>
<body bgcolor="white">
<center><h1>401 Authorization Required</h1></center>
<hr><center>nginx/1.11.3</center>
</body>
</html>
* Connection #0 to host 172.17.4.99 left intact