MITM Proxy

A powerful Man-In-The-Middle proxy utility for intercepting, inspecting, and modifying HTTP/HTTPS traffic.

Features

• Intercepts and modifies both HTTP and HTTPS traffic
• Dynamic TLS certificate generation for HTTPS connections
• Rule-based system for conditional traffic modification
• Support for custom Go scripts to modify requests and responses
• WebSocket connection handling
• Environment variable integration

Quick Start

Prerequisites

• Go 1.18 or higher
• OpenSSL (for generating CA certificates)

Installation

1. Clone the repository:

   git clone https://github.com/eugene-ivanov-hash/mitm-proxy.git
   cd mitm-proxy

2. Generate CA certificate and key:

   openssl genrsa -out ca.key 2048
   openssl req -new -x509 -days 3650 -key ca.key -out ca.crt -subj "/CN=MITM Proxy CA"

3. Build the application:

   go build -o mitm-proxy

4. Add the CA certificate to your system's trusted certificates (see Installation Guide)

Usage

Start the proxy:

./mitm-proxy -cacertfile ca.crt -cakeyfile ca.key

Configure your client to use the proxy (default: 127.0.0.1:9999).

For more options:

./mitm-proxy -help

Creating Rules

Rules are defined in YAML files in the proxy_rules directory:

enabled: true
rules:
  - name: "Add Custom Header"
    enabled: true
    change: "request"
    rule: "req.URL.Host == 'example.com'"
    action: "script"
    script: |
      req.Header.Add("X-Custom-Header", "CustomValue")
      return nil

Documentation

For detailed documentation, see the docs directory:

• Overview
• Installation Guide
• Usage Guide
• Rules System
• Example Rules
• Troubleshooting

License

See the LICENSE file for details.