S800 Vehicle Network Security Testing Framework

Skill by ara.so — Security Skills collection.

Overview

S800 is a vehicle network security testing framework designed for automotive penetration testing, CAN bus analysis, and vulnerability assessment. The framework provides tools for analyzing in-vehicle networks, performing fuzzing operations, and identifying security weaknesses in automotive communication protocols.

Note: This is a test/research framework. Use only on authorized systems and test environments. Never use on production vehicles without explicit permission.

Installation

Requirements

Python 3.7+
CAN interface hardware (USB-to-CAN adapter, SocketCAN compatible device)
Root/administrator privileges for network interface access
Linux kernel with SocketCAN support (recommended)

Setup

bash

# Clone the repository
git clone https://github.com/zhu-zhu666/S800-Vehicle-Network-Security-Testing-Framework.git
cd S800-Vehicle-Network-Security-Testing-Framework

# Install dependencies
pip install -r requirements.txt

# Install python-can for CAN bus communication
pip install python-can

# Set up SocketCAN interface (Linux)
sudo ip link set can0 type can bitrate 500000
sudo ip link set up can0

Core Components

1. CAN Bus Interface

The framework interfaces with vehicle CAN bus networks for traffic capture and injection.

python

import can

# Initialize CAN bus connection
bus = can.interface.Bus(channel='can0', bustype='socketcan')

# Read CAN messages
def read_can_traffic(duration=10):
    """Capture CAN bus traffic for specified duration"""
    messages = []
    start_time = time.time()
    
    while time.time() - start_time < duration:
        msg = bus.recv(timeout=1.0)
        if msg:
            messages.append({
                'timestamp': msg.timestamp,
                'arbitration_id': hex(msg.arbitration_id),
                'data': msg.data.hex(),
                'dlc': msg.dlc
            })
    
    return messages

# Send CAN message
def send_can_message(arbitration_id, data):
    """Inject CAN message onto the bus"""
    msg = can.Message(
        arbitration_id=arbitration_id,
        data=bytes.fromhex(data),
        is_extended_id=False
    )
    bus.send(msg)
    print(f"Sent: ID={hex(arbitration_id)}, Data={data}")

2. Traffic Analysis

Analyze captured CAN traffic to identify patterns and anomalies.

python

from collections import Counter
import json

def analyze_can_traffic(messages):
    """Analyze CAN traffic for security assessment"""
    analysis = {
        'total_messages': len(messages),
        'unique_ids': set(),
        'id_frequency': Counter(),
        'data_patterns': {}
    }
    
    for msg in messages:
        arb_id = msg['arbitration_id']
        analysis['unique_ids'].add(arb_id)
        analysis['id_frequency'][arb_id] += 1
        
        # Track data patterns per ID
        if arb_id not in analysis['data_patterns']:
            analysis['data_patterns'][arb_id] = []
        analysis['data_patterns'][arb_id].append(msg['data'])
    
    # Convert set to list for JSON serialization
    analysis['unique_ids'] = list(analysis['unique_ids'])
    analysis['id_frequency'] = dict(analysis['id_frequency'])
    
    return analysis

def save_analysis(analysis, output_file='analysis.json'):
    """Save analysis results to file"""
    with open(output_file, 'w') as f:
        json.dump(analysis, f, indent=2)

3. Fuzzing Operations

Perform fuzzing tests to identify vulnerabilities.

python

import random
import time

def fuzz_can_id(target_id, num_iterations=100, delay=0.1):
    """Fuzz a specific CAN ID with random data"""
    print(f"Starting fuzzing on CAN ID: {hex(target_id)}")
    
    for i in range(num_iterations):
        # Generate random 8-byte payload
        fuzz_data = bytes([random.randint(0, 255) for _ in range(8)])
        
        msg = can.Message(
            arbitration_id=target_id,
            data=fuzz_data,
            is_extended_id=False
        )
        
        try:
            bus.send(msg)
            print(f"[{i+1}/{num_iterations}] Sent: {fuzz_data.hex()}")
            time.sleep(delay)
        except Exception as e:
            print(f"Error sending message: {e}")

def intelligent_fuzz(target_id, baseline_data, mutations=50):
    """Perform mutation-based fuzzing on known data"""
    baseline = bytes.fromhex(baseline_data)
    
    for i in range(mutations):
        mutated = bytearray(baseline)
        # Mutate random byte
        byte_idx = random.randint(0, len(mutated) - 1)
        mutated[byte_idx] = random.randint(0, 255)
        
        msg = can.Message(
            arbitration_id=target_id,
            data=bytes(mutated),
            is_extended_id=False
        )
        
        bus.send(msg)
        time.sleep(0.05)

4. Replay Attacks

Capture and replay CAN messages for security testing.

python

import pickle

def capture_session(output_file='session.pkl', duration=30):
    """Capture CAN session for replay"""
    print(f"Capturing session for {duration} seconds...")
    messages = []
    start_time = time.time()
    
    while time.time() - start_time < duration:
        msg = bus.recv(timeout=1.0)
        if msg:
            messages.append({
                'arbitration_id': msg.arbitration_id,
                'data': bytes(msg.data),
                'timestamp': msg.timestamp,
                'is_extended_id': msg.is_extended_id
            })
    
    with open(output_file, 'wb') as f:
        pickle.dump(messages, f)
    
    print(f"Captured {len(messages)} messages")
    return messages

def replay_session(input_file='session.pkl', speed_multiplier=1.0):
    """Replay captured CAN session"""
    with open(input_file, 'rb') as f:
        messages = pickle.load(f)
    
    print(f"Replaying {len(messages)} messages...")
    
    if not messages:
        return
    
    base_time = messages[0]['timestamp']
    start_time = time.time()
    
    for msg_data in messages:
        # Calculate timing
        original_delay = msg_data['timestamp'] - base_time
        target_time = start_time + (original_delay / speed_multiplier)
        
        # Wait until target time
        sleep_time = target_time - time.time()
        if sleep_time > 0:
            time.sleep(sleep_time)
        
        # Send message
        msg = can.Message(
            arbitration_id=msg_data['arbitration_id'],
            data=msg_data['data'],
            is_extended_id=msg_data['is_extended_id']
        )
        bus.send(msg)

Configuration

Environment Variables

bash

# CAN interface configuration
export CAN_INTERFACE=can0
export CAN_BITRATE=500000

# Logging configuration
export S800_LOG_LEVEL=INFO
export S800_LOG_FILE=/var/log/s800.log

# Testing parameters
export S800_FUZZ_ITERATIONS=1000
export S800_FUZZ_DELAY=0.1

Configuration File

Create

config.json

for framework settings:

json

{
  "interface": {
    "channel": "can0",
    "bustype": "socketcan",
    "bitrate": 500000
  },
  "logging": {
    "level": "INFO",
    "file": "s800.log",
    "format": "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
  },
  "fuzzing": {
    "default_iterations": 100,
    "default_delay": 0.1,
    "target_ids": ["0x123", "0x456", "0x789"]
  },
  "analysis": {
    "output_dir": "./results",
    "save_pcap": true
  }
}

Common Testing Patterns

Full Security Assessment

python

import os
from datetime import datetime

def run_security_assessment(target_ids, duration=60):
    """Perform comprehensive security assessment"""
    timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
    output_dir = f"assessment_{timestamp}"
    os.makedirs(output_dir, exist_ok=True)
    
    # 1. Capture baseline traffic
    print("[1/4] Capturing baseline traffic...")
    baseline = read_can_traffic(duration=duration)
    with open(f"{output_dir}/baseline.json", 'w') as f:
        json.dump(baseline, f, indent=2)
    
    # 2. Analyze traffic
    print("[2/4] Analyzing traffic...")
    analysis = analyze_can_traffic(baseline)
    save_analysis(analysis, f"{output_dir}/analysis.json")
    
    # 3. Perform targeted fuzzing
    print("[3/4] Fuzzing target IDs...")
    for target_id in target_ids:
        fuzz_can_id(int(target_id, 16), num_iterations=50)
        time.sleep(2)
    
    # 4. Capture post-fuzz traffic
    print("[4/4] Capturing post-fuzz traffic...")
    post_fuzz = read_can_traffic(duration=30)
    with open(f"{output_dir}/post_fuzz.json", 'w') as f:
        json.dump(post_fuzz, f, indent=2)
    
    print(f"Assessment complete. Results in {output_dir}/")

Monitor and Alert

python

def monitor_can_bus(alert_ids=None, callback=None):
    """Monitor CAN bus for specific IDs or anomalies"""
    alert_ids = alert_ids or []
    
    print("Starting CAN bus monitoring...")
    print(f"Alert IDs: {[hex(id) for id in alert_ids]}")
    
    while True:
        msg = bus.recv(timeout=1.0)
        if msg:
            if msg.arbitration_id in alert_ids:
                alert_msg = f"ALERT: Detected ID {hex(msg.arbitration_id)} - Data: {msg.data.hex()}"
                print(alert_msg)
                
                if callback:
                    callback(msg)

Troubleshooting

CAN Interface Not Found

bash

# Check available interfaces
ip link show

# Verify SocketCAN module loaded
lsmod | grep can

# Load modules if needed
sudo modprobe can
sudo modprobe can_raw
sudo modprobe vcan

Permission Denied

bash

# Add user to dialout group (for USB-CAN adapters)
sudo usermod -a -G dialout $USER

# Or run with sudo (temporary)
sudo python your_script.py

No Messages Received

python

# Verify CAN bus is active
def test_can_connection():
    """Test CAN interface connectivity"""
    try:
        bus = can.interface.Bus(channel='can0', bustype='socketcan')
        msg = bus.recv(timeout=5.0)
        if msg:
            print(f"Connection OK: Received message ID={hex(msg.arbitration_id)}")
            return True
        else:
            print("No messages received - check vehicle connection")
            return False
    except Exception as e:
        print(f"Connection failed: {e}")
        return False

Bitrate Mismatch

Common CAN bus bitrates:

Low-speed CAN: 125 kbps
High-speed CAN: 500 kbps
CAN-FD: 1-5 Mbps

bash

# Try different bitrates
sudo ip link set can0 type can bitrate 125000
sudo ip link set can0 type can bitrate 250000
sudo ip link set can0 type can bitrate 500000

Safety and Legal Considerations

Authorization Required: Only test on vehicles you own or have explicit permission to test
Safety Critical: Vehicle networks control safety systems - unauthorized testing can cause harm
Backup Systems: Ensure vehicle can be safely recovered if testing causes issues
Isolated Testing: Use dedicated test benches when possible
Log Everything: Maintain detailed logs of all testing activities
Emergency Stop: Have a kill switch or emergency procedure ready

s800-vehicle-network-security-testing

NPX Install

Tags

SKILL.md Content

S800 Vehicle Network Security Testing Framework

Overview

Installation

Requirements

Setup

Core Components

1. CAN Bus Interface

2. Traffic Analysis

3. Fuzzing Operations

4. Replay Attacks

Configuration

Environment Variables

Configuration File

Common Testing Patterns

Full Security Assessment

Monitor and Alert

Troubleshooting

CAN Interface Not Found

Permission Denied

No Messages Received

Bitrate Mismatch

Safety and Legal Considerations