UPDATE: As far as I know, this project is not being used in production anywhere anymore. As such, I will be archiving it to avoid having to maintain it. Feel free to reach out to me (Jens) if you would like to unarchive it and find it useful.

Secury Proxy Proxy

Secure Proxy Proxy (SPP) is an HTTP(S) forward proxy that only allows forwarding TLS traffic. It does this in two different ways:

• It rejects all HTTP methods (GET, POST etc.) except CONNECT. This means that it rejects any traffic which it knows isn't encrypted.
• For CONNECT requests, it probes the downstream connection that it can do a TLS handshake. This adds security at the expense of latency.

SPP supports two types of downstream destinations for the CONNECT TCP tunnels:

• Other forward proxies. If it wasn't this the name of the proxy would be "Secure Proxy". Routing to know which downstream proxy to go through is done using the destination host+port in CONNECT (that is, google.com:443 in CONNECT google.com:443). It can either be based on exact match or through regular expression. The routing rules are tested in order.
• Direct tunneling to google.com:443 without passing through a downstream forward HTTP proxy.

If no routing rule can be found, the proxy proxies to a default proxy if it exists. If no default proxy is defined in config, it makes a direct connection to the destination the upstream client has asked to connect to.

See config.yaml for an example configuration.

Usage

$ go get github.com/JensRantil/secure-proxy-proxy
$ GODEBUG=http2server=0 secure-proxy-proxy --help
usage: secure-secure-proxy [<flags>] <command> [<args> ...]

A TLS-only proxy that routes requests downstream to specific proxy depending on host.

Flags:
  --help                Show context-sensitive help (also try --help-long and --help-man).
  --config=config.yaml  Config file to read up.

Commands:
  help [<command>...]
    Show help.

  serve [<flags>]
    Serve the proxy.

  validate
    Validate the configuration file can be parsed. Non-zero exit code if fails. Useful for CI.