Coverage And Kali Considerations - AyhamAsfoor/StegX GitHub Wiki

Coverage Improvement Tips and Kali Linux Considerations

This document provides guidance on improving test coverage for StegX and addresses specific considerations for testing in a Kali Linux environment.

Test Coverage Improvement Tips

1. Code Coverage Analysis

Use coverage tools: Implement pytest-cov or similar tools to measure code coverage:
```
pytest --cov=stegx_core tests/
```
Set coverage targets: Aim for at least 80% code coverage overall, with higher targets (90%+) for critical modules like crypto and steganography.
Identify uncovered code: Regularly review coverage reports to identify untested code paths, particularly error handling branches.

2. Mutation Testing

Implement mutation testing: Use tools like mutmut or cosmic-ray to verify that tests can detect code changes:
```
pip install mutmut
mutmut run --paths-to-mutate stegx_core/
```
Focus on critical functions: Prioritize mutation testing for security-critical functions in the crypto module.

3. Property-Based Testing

Add property-based tests: Use libraries like hypothesis to generate diverse test inputs:

from hypothesis import given, strategies as st

@given(data=st.binary(min_size=1, max_size=1000))
def test_encrypt_decrypt_property(data):
    password = "test_password"
    encrypted = encrypt_data(data, password)
    decrypted = decrypt_data(encrypted, password)
    assert decrypted == data

Test invariants: Define and test properties that should always hold true regardless of inputs.

4. Boundary Testing Expansion

Expand boundary tests: Add more tests at the boundaries of valid input ranges:
- Files of exactly the maximum supported size
- Images with minimum dimensions that can store data
- Passwords at minimum/maximum length limits
Test resource limits: Add tests for behavior under resource constraints (low memory, disk space).

5. Negative Testing Enhancement

Enhance negative testing: Add more tests for invalid inputs and error conditions:
- Malformed image files (partially corrupted)
- Interrupted operations (simulate power loss during encoding/decoding)
- Race conditions in file operations

6. Integration Test Expansion

Add cross-module integration tests: Test interactions between modules that aren't directly connected.
Test configuration variations: Test with different combinations of options (compression on/off, different image modes).

Kali Linux-Specific Considerations

1. Security Testing in Kali Environment

Test with Kali security tools: Use Kali's built-in tools to analyze StegX:
```
bandit -r stegx_project/

graudit stegx_project/
```
Test against steganalysis tools: Verify resistance against steganalysis tools available in Kali:
```
apt-get install stegdetect

stegdetect -t p output_stego_image.png
```

2. Privilege Escalation Testing

Test with different privilege levels: Verify behavior when run as different users:

def test_privilege_handling():
    # Test with elevated privileges (if applicable)
    # Test with restricted privileges

Test file permission handling: Verify proper handling of files with restricted permissions.

3. Kali-Specific Deployment Testing

Test installation in Kali environment: Verify the Debian package installs correctly in Kali:
```
dpkg -i stegx_1.1.0.deb

dpkg -l | grep steg
```

Test integration with Kali workflow: Verify StegX works well with other Kali tools:

def test_kali_workflow_integration():
    # Test using output from other tools as input
    # Test providing output to other tools

4. Penetration Testing Scenarios

Test in realistic scenarios: Create tests that simulate real penetration testing use cases:

def test_pentest_scenario():
    # Hide sensitive data in an innocuous image
    # Transfer the image through a monitored channel
    # Extract the data on the other side

Test with actual target file types: Use common file types found during penetration testing (screenshots, network captures).

5. Anti-Forensics Considerations

Test forensic resistance: Verify that StegX doesn't leave unnecessary artifacts:

def test_forensic_artifacts():
    # Check for temporary files
    # Check for metadata leakage
    # Check for memory artifacts

Test secure deletion: If StegX includes secure deletion features, test their effectiveness.

6. Network and System Monitoring Evasion

Test network footprint: Verify StegX doesn't generate suspicious network traffic:

def test_network_footprint():
    # Monitor network connections during operation
    # Check for unexpected DNS queries or connections

Test system monitoring evasion: Verify StegX doesn't trigger common security monitoring tools.

Continuous Integration Setup for Kali Linux

To ensure ongoing test coverage and compatibility with Kali Linux, set up a CI pipeline that:

Runs on Kali Linux environment: Use Docker containers based on Kali Linux for testing.
Executes the full test suite: Run all test categories on each commit.
Measures and reports coverage: Generate and archive coverage reports.
Performs security scans: Integrate security scanning tools into the pipeline.
Tests Debian package building: Verify the package builds correctly.

Example CI configuration for GitHub Actions:

name: StegX CI

on:
  push:
    branches: [ main ]
  pull_request:
    branches: [ main ]

jobs:
  test:
    runs-on: ubuntu-latest
    container:
      image: kalilinux/kali-rolling
      options: --privileged
    
    steps:
    - uses: actions/checkout@v2
    
    - name: Install dependencies
      run: |
        apt-get update
        apt-get install -y python3 python3-pip python3-dev
        pip3 install -r requirements.txt
        pip3 install pytest pytest-cov bandit
    
    - name: Run tests
      run: |
        pytest --cov=stegx_core tests/
    
    - name: Security scan
      run: |
        bandit -r stegx_project/
    
    - name: Build Debian package
      run: |
        
    - name: Upload coverage report
      uses: actions/upload-artifact@v2
      with:
        name: coverage-report
        path: htmlcov/

This testing strategy was developed and refined by the StegX team for use in real-world security environments.