Firewall Layer

Modular firewall system for monitoring and blocking network/LLM requests.

Installation

pip install -e .

Or install from the parent project:

pip install -e ../firewall_layer

Structure

• logger.py - Logging setup
• rules.py - Firewall rules (block POST, allow localhost, etc.)
• observer.py - Request/LLM observation handlers
• firewall.py - Main firewall context manager
• __init__.py - Public API

Usage

Basic Usage

from firewall_layer import observe_extract_content

with observe_extract_content() as observations:
    # Your code here
    result = some_function()
    # observations contains all network/LLM activity

Custom Firewall Rules

from firewall_layer import Firewall
from firewall_layer.rules import BlockPostRule, AllowLocalhostRule, FirewallRules

# Create custom rules
rules = FirewallRules([
    BlockPostRule(),  # Block all POST
    AllowLocalhostRule(),  # Allow localhost (overrides block)
])

with Firewall(rules=rules) as firewall:
    # Your code
    pass

Available Rules

• BlockPostRule() - Blocks all POST requests
• AllowLocalhostRule() - Allows requests to localhost
• BlockDomainRule(domains=['example.com']) - Blocks specific domains

Features

• Monitors requests library calls
• Monitors aiohttp calls (async)
• Monitors LLM invoke calls
• Blocks requests based on rules
• Logs all activity to file
• Modular and extensible