Agent skill

proxy-server

Expert skill for proxy server implementation, configuration, and traffic interception

View SKILL.md on GitHub Repository
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Forks 31

Install this agent skill to your Project

npx add-skill https://github.com/a5c-ai/babysitter/tree/main/library/specializations/network-programming/skills/proxy-server

SKILL.md

Proxy Server Skill

Expert skill for proxy server implementation, configuration, and network traffic interception.

Capabilities

  • Proxy Configuration: Configure Squid, mitmproxy, Charles, and nginx proxy
  • HTTP CONNECT Tunneling: Implement HTTP CONNECT for HTTPS tunneling
  • SOCKS Protocol: Configure SOCKS4/SOCKS5 proxy servers
  • Transparent Proxying: Implement transparent proxying with iptables/nftables
  • Traffic Analysis: Analyze proxy traffic and generate reports
  • Debugging: Debug proxy connection issues and SSL/TLS interception
  • PAC File Generation: Generate Proxy Auto-Configuration (PAC) files
  • Caching: Configure proxy caching strategies

Tools and Dependencies

  • Squid - Caching proxy server
  • mitmproxy - Interactive HTTPS proxy
  • nginx - HTTP and reverse proxy
  • iptables/nftables - Linux firewall for transparent proxy
  • Charles - HTTP proxy/monitor
  • tinyproxy - Lightweight proxy

Target Processes

  • http-proxy-server.js
  • socks5-proxy.js
  • transparent-proxy.js

Usage Examples

Squid HTTP Proxy Configuration

squid
http_port 3128
acl localnet src 10.0.0.0/8
http_access allow localnet
cache_dir ufs /var/spool/squid 10000 16 256

Transparent Proxy with iptables

bash
iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 3128
iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 443 -j REDIRECT --to-port 3129

mitmproxy Interception

bash
mitmproxy -p 8080 --mode transparent
mitmdump -w traffic.flow

PAC File Example

javascript
function FindProxyForURL(url, host) {
    if (isPlainHostName(host)) return "DIRECT";
    if (dnsDomainIs(host, ".internal.com")) return "DIRECT";
    return "PROXY proxy.example.com:8080";
}

Quality Gates

  • Proxy functionality verified
  • SSL/TLS interception working
  • Transparent mode operational
  • Caching efficiency validated
  • Access control tested

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