Kong External Auth

Kong plugin to authenticate requests using http services.

Description

This plugin lets you authenticate any request using a separate HTTP service.

For every incoming request, the method, path, query and headers are forwarded in body request to the route POST /auth of auth service.

If the service returns 200, the request continues the normal path and the service body response is put as string in "CLAV-Auth" header. if the service returns 403, 403 (Forbidden) is returned to the client. In any other case, 401 (Unauthorized) is returned to the client.

Installation

$ luarocks install --server=https://luarocks.org/manifests/jcm300 external-auth

Update the plugins config to add external-auth:

plugins = bundled,external-auth

Configuration

Add it to a service calling the admin api:

$ curl -X POST http://kong:8001/services/{service}/plugins \
  -d 'name=external-auth' \
  -d 'config.url=http://auth-service/'

Parameter	default	description
`config.url`	[required]	Service receiving the original request method, path, query, headers. Http and https are allowed.
`config.path`	"/auth"	Path on auth service where the POST requests will be made.
`config.connect_timeout`	10000	Connection timeout (in ms) to the provided url.
`config.send_timeout`	60000	Send timeout (in ms) to the provided url.
`config.read_timeout`	60000	Read timeout (in ms) to the provided url.
`config.message_401`	"Unauthorized"	Error message for 401 responses.
`config.message_403`	"You don't have enough permissions to access"	Error message for 403 responses.
`config.message_404`	"Not Found"	Error message for 404 responses.
`config.header`	"CLAV-Auth"	Header where the service body response goes in normal path.

TODO

Allow auth service response headers to be inserted to the request (currently, only the status code of the response is used).
On failure, allow auth service response to be returned to the client.
Use path from the configured url (currently always overrides the auth service path with the one from the incoming request).

References

Inspired on Ambassador's auth service

https://www.getambassador.io/reference/services/auth-service

Original Author

Pablo Romanelli

License

The MIT License (MIT)
=====================

Copyright (c) 2015 Panagis Tselentis

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

ag93999/kong-external-auth