Proxy Server

DevOps & Security

proxy-server

Proxy Server is an Agent Skill for devops & security published in the a5c-ai/babysitter repository on GitHub: a SKILL.md instruction file an AI agent can load to do this task.

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

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QUICK START

How to use this skill

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Prompt to paste

Inspect the Agent Skill at https://github.com/a5c-ai/babysitter/blob/HEAD/library/specializations/network-programming/skills/proxy-server/SKILL.md and all supporting files. Report provenance, permissions, scripts, dependencies, and security risks. Propose an exact installation into .agents/skills/proxy-server, but wait for my approval before writing files or running scripts.

Copying this prompt does not install or run the skill. Review third-party files before use.

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

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

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

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

PAC File Example

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