aws_sign_proxy

AWS v4 Signing Proxy

Proxy to sign requests with AWS V4 Signatures. This project exists because I got fed up with trying to sign requests using Java.

Is this a fantastic idea? No. Does it get the job done? Yes.

Configuration

Configuration is performed via environment variables:

• AWS_SIGN_PROXY_BIND: the address to bind to accept requests to sign and proxy to another service. Default is :8080.
• AWS_SIGN_PROXY_TARGETPROTO: the protocol to use when proxying the request to the other service. Default is https.
• AWS_SIGN_PROXY_TARGETHOST: hostname for the service which requires AWS v4 signed requests.
• AWS_SIGN_PROXY_PROVIDER: provider for the target service.
• AWS_SIGN_PROXY_REGION: region for the target service. This will default to AWS_DEFAULT_REGION if not explicitly set.
• AWS_SIGN_PROXY_BLOCKHEADERS: a list of header names that should be removed from the proxied request.
• AWS_SIGN_PROXY_EXTRAHEADERS: a map of additional headers that should be added to the proxied request.
• AWS_SIGN_PROXY_HEALTHZENDPOINT: relative URL to use for simple health checking. Default is /_healthz. Change this if it somehow collides with the upstream service.
• AWS_SIGN_PROXY_METRICSENDPOINT: relative URL to use for Prometheus metrics. Default is /_metrics. Change this if it somehow collides with the upstream service.

It is expected that you have AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY for the target service already set in your environment as well.

Usage

To issue a request to a backing service foo.bar.com using the baz provider in the us-east-1 region:

$ export AWS_SIGN_PROXY_TARGETHOST=foo.bar.com
$ export AWS_SIGN_PROXY_PROVIDER=baz
$ export AWS_SIGN_PROXY_REGION=us-east-1
$ aws-sign-proxy

Now you may issue requests to the backing service by sending your plain requests to http://localhost:8080/ instead:

$ curl http://localhost:8080/some/service/endpoint -H 'X-Api-Key: blablabla'

Such a request would result in a signed request to

https://foo.bar.com/some/service/endpoint

along with the X-Api-Key header (and any others specified on the plain request).