Invoke-SocksProxy

Creates a local or "reverse" Socks proxy using powershell.

The local proxy is a simple Socks 4/5 proxy.

The reverse proxy creates a tcp tunnel by initiating outbond SSL connections that can go through the system's proxy. The tunnel can then be used as a socks proxy on the remote host to pivot into the local host's network.

Examples

Local

Create a Socks 4/5 proxy on port 1080:

Import-Module .\Invoke-SocksProxy.psm1
Invoke-SocksProxy -bindPort 1080

Increase the maximum number of threads from 200 to 400

Import-Module .\Invoke-SocksProxy.psm1
Invoke-SocksProxy -threads 400

Reverse

Create a "reverse" Socks 4/5 proxy on port 1080 of a remote host:

# On the remote host: 
# Generate a private key and self signed cert
openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout private.key -out cert.pem

# Get the certificate fingerprint to verify it:
openssl x509 -in cert.pem -noout -sha1 -fingerprint | cut -d "=" -f 2 | tr -d ":"

# Start the handler
python ReverseSocksProxyHandler.py 443 1080 ./cert.pem ./private.key

# On the local host:
Import-Module .\Invoke-SocksProxy.psm1
Invoke-ReverseSocksProxy -remotePort 443 -remoteHost 192.168.49.130 

# Go through the system proxy:
Invoke-ReverseSocksProxy -remotePort 443 -remoteHost 192.168.49.130 -useSystemProxy

# Validate certificate
Invoke-ReverseSocksProxy -remotePort 443 -remoteHost 192.168.49.130 -certFingerprint '93061FDB30D69A435ACF96430744C5CC5473D44E'

# Give up after a number of failed connections to the handler:
Invoke-ReverseSocksProxy -remotePort 443 -remoteHost 192.168.49.130 -maxRetries 10

Credit for the System Proxy trick: https://github.com/Arno0x/PowerShellScripts/blob/master/proxyTunnel.ps1

Limitations

• This is only a subset of the Socks 4 and 5 protocols: It does not support authentication, It does not support UDP or bind requests.
• When the Socks Proxy runs out of available threads, new connections cannot be established until a thread is freed.
• New features will be implemented in the future. PR are welcome.

Disclaimer

This project is intended for security researchers and penetration testers and should only be used with the approval of system owners.