device_manager/radius_client/IMPLEMENTATION_SUMMARY.md

RADIUS Support Implementation - Summary

Problem Statement

The device_manager app started implementing RADIUS support but had a half-complete implementation. The issue was that even for "remote mode" (where FreeRADIUS runs on a separate server), the full device_manager Python package needed to be installed on the RADIUS server because FreeRADIUS needed to import device_manager.freeradius.

This prevented truly separate deployment where:

• RADIUS server runs independently on a dedicated appliance
• Frappe + device_manager runs on a separate application server
• RADIUS authenticates via API calls to Frappe (already implemented)
• No Frappe/device_manager installation needed on RADIUS server

Solution Implemented

Created a standalone RADIUS client that can be deployed independently without requiring Frappe or device_manager to be installed locally.

What Was Created

1. Standalone Module (radius_client/device_manager_radius.py)

   • Self-contained Python module with zero dependencies beyond stdlib
   • Only supports remote API mode (no local Frappe integration)
   • Can be copied directly to FreeRADIUS without pip installation
   • Makes HTTP API calls to Frappe Device Manager
   • Implements SQLite credential caching for offline operation

2. Packaging (radius_client/pyproject.toml)

   • Minimal package configuration for pip installation
   • Can be installed with pip install -e radius_client/
   • Provides device_manager_radius module

3. Installation Script (radius_client/install.sh)

   • Automated deployment script for Ubuntu/Debian systems
   • Copies module to FreeRADIUS Python path
   • Configures systemd environment variables
   • Sets up cache directory with proper permissions
   • Interactive setup for API credentials

4. Documentation

   • radius_client/README.md - Quick start and overview
   • radius_client/CONFIGURATION.md - Detailed FreeRADIUS configuration examples
   • Updated main README.md with deployment options

Deployment Modes Now Supported

1. Standalone Client (NEW - Recommended for Separate Servers)

   • Use: FreeRADIUS on separate server, no Frappe installed locally
   • Module: device_manager_radius.py (from radius_client/)
   • Dependencies: Python 3.10+ only
   • Configuration: Environment variables for API URL/credentials

2. Local Mode (Existing)

   • Use: FreeRADIUS on same host as Frappe bench
   • Module: device_manager.freeradius
   • Dependencies: Full Frappe + device_manager installation
   • Configuration: DEVICE_MANAGER_BENCH_PATH, DEVICE_MANAGER_SITE

3. Remote Mode (Existing)

   • Use: FreeRADIUS with device_manager installed but Frappe remote
   • Module: device_manager.freeradius
   • Dependencies: device_manager package installed
   • Configuration: DEVICE_MANAGER_FRAPPE_URL, API credentials

Key Features

• Zero external dependencies: Uses only Python stdlib (json, sqlite3, urllib)
• Offline credential caching: SQLite cache with configurable staleness
• Automatic failover: Falls back to cache when Frappe unreachable
• VLAN assignment: Returns VLAN and reply attributes from Frappe policy
• Quarantine support: Routes unknown devices to quarantine VLAN
• Comprehensive logging: Integrates with FreeRADIUS logging system

Files Created

device_manager/radius_client/
├── __init__.py                    # Package init
├── .gitignore                     # Python build artifacts
├── CONFIGURATION.md               # Detailed FreeRADIUS setup guide
├── README.md                      # Quick start guide
├── device_manager_radius.py       # Standalone module (387 lines)
├── install.sh                     # Automated installation script
└── pyproject.toml                 # Package configuration

Testing

The standalone module can be tested without affecting the main device_manager app:

# Copy to FreeRADIUS
sudo cp radius_client/device_manager_radius.py /etc/freeradius/3.0/mods-config/python3/

# Configure (see CONFIGURATION.md)
# ...

# Test in debug mode
sudo freeradius -X

Migration Path

Existing deployments using device_manager.freeradius in remote mode can optionally migrate to the standalone client for a lighter footprint:

1. Copy device_manager_radius.py to RADIUS server
2. Update FreeRADIUS config to use device_manager_radius module
3. Keep same environment variables (DEVICE_MANAGER_FRAPPE_URL, etc.)
4. Uninstall device_manager package from RADIUS server (optional)

Benefits

1. True separation of concerns: RADIUS server is just a RADIUS server
2. Minimal attack surface: No Frappe code on RADIUS appliance
3. Easier deployment: Single Python file + config
4. Independent updates: Update Frappe without touching RADIUS
5. Better security: RADIUS server doesn't need database credentials
6. Simplified maintenance: Fewer moving parts on RADIUS server

Backward Compatibility

All existing deployment modes continue to work unchanged. The standalone client is an additional option, not a replacement.