simple-iap-proxy

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simple-iap-proxy

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Simple proxy for accessing private GKE master endpoints and other services behind a Google Identity Aware Proxy

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simple Google IAP proxy
=======================
This is a simple IAP HTTP/S proxy. It will intercept the required HTTPS request and
inject the IAP proxy authorization header.

![simple-iap-proxy](https://raw.githubusercontent.com/binxio/simple-iap-proxy/main/simple-iap-proxy.png)

## simple-iap-proxy client

The client will start a real HTTP/S proxy and forward any requests for
ip addresses of GKE cluster master endpoints or specified hostnames to the IAP proxy.
Adds the required ID token as the Proxy-Authorization header in the request. Generates self-signed
certificates for the targeted hosts on the fly.

```
Usage:
simple-iap-proxy client [flags]

Flags:
  -t, --target-url string         to forward requests to
  -a, --iap-audience string       of the IAP application
  -s, --service-account string    to impersonate
  -u, --use-default-credentials   use default credentials instead of gcloud configuration
  -C, --configuration string      name of gcloud configuration to use for credentials
  -G, --to-gke                    proxy to GKE clusters in the project
  -H, --to-host strings           proxy to these hosts, specified as regular expression
      --http-protocol             proxy listens using HTTP instead of HTTPS

Global Flags:
  -k, --key-file string           key file for serving https
  -c, --certificate-file string   certificate of the server
  -p, --project string            google project id to use
  -P, --port int                  port to listen on (default 8080)
  -d, --debug                     provide debug information
```

## simple-iap-proxy gke-server

Reads the Host header of the http requests and if it matches the ip address of a GKE cluster master endpoint,
forwards the request to it. Reject requests for any other endpoint. 
```
Usage:
simple-iap-proxy gke-server

Global Flags:
  -k, --key-file string           key file for serving https
  -c, --certificate-file string   certificate of the server
  -P, --port int                  port to listen on (default 8080)
  -p, --project string            google project id to use
  -d, --debug                     provide debug information
```

## simple-iap-proxy generate-certificate

generates a private key and self-signed certificate which can be used to
serve over HTTPS.

```
Usage:
simple-iap-proxy generate-certificate [flags]

Flags:
--dns-name string   on the certificate (default "localhost")

Global Flags:
  -k, --key-file string           key file for serving https
  -c, --certificate-file string   certificate of the server
```

## examples
There are two examples you can try out:

- [IAP proxy to GKE clusters](./examples/to-gke-cluster/README.md)
- [IAP Proxy to a normal service](./examples/to-service/README.md)

With the [GKE cluster setup](./examples/to-gke-cluster/README.md), you can use the [cloudbuild.yaml](examples/to-gke-cluster/cloudbuild-to-private-gke-master.yaml) to 
connect from [Google cloudbuild](https://cloud.google.com/build).

## installing the IAP proxy
Install the simple-iap-proxy by downloading the latest release 
from [github.com/binxio/simple-iap-proxy](https://github.com/binxio/simple-iap-proxy/releases).

## Limitations
- The client proxy only supports a single IAP proxy endpoint url as a target.

## Caveats
- The IAP protocol does not support websockets as Authorization header cannot be passed in. Commands which rely
  on websockets will fail (ie kubectl exec).
- The proxy is beta software, so I am happy to hear your feedback!

[Read the blog](https://binx.io/blog/2021/12/11/how-to-connect-to-a-gke-private-endpoint-using-iap/)

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