Implement Comprehensive VPN Encryption and Protocol Security Checks

.gitignore

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-# Python
 __pycache__/
 *.py[cod]
 *$py.class
-*.so
-.Python
-env/
-venv/
-ENV/
-env.bak/
-venv.bak/
-*.egg-info/
-dist/
-build/
-
-# Security Analysis Results (user-generated)
-*.json
-*_results.txt
-*_report.txt
-*_audit.json
-daily_check.json
-weekly_audit.json
-security_check.json
-
-# macOS
-.DS_Store
-.DS_Store?
-._*
-.Spotlight-V100
-.Trashes
-ehthumbs.db
-Thumbs.db
-
-# IDE
+.pytest_cache/
+.coverage
+htmlcov/
+.env
+*.log
 .vscode/
 .idea/
 *.swp
-*.swo
-*~
-
-# Temporary files
-*.tmp
-*.temp
-*.log
-
-# User configuration
-config.local.py
-.env 
+dist/
+build/
+*.egg-info/

src/vpn_security.py

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+"""VPN Encryption and Protocol Security Checks Module.
+
+This module provides comprehensive security checks for VPN configurations,
+focusing on encryption strength, protocol vulnerabilities, and best practices.
+"""
+
+from typing import Dict, List, Optional, Any
+import re
+import ssl
+
+class VPNSecurityAssessment:
+    """Comprehensive VPN security assessment class."""
+
+    STRONG_ENCRYPTION_PROTOCOLS = {
+        'TLS_1_2': {'min_key_length': 2048},
+        'TLS_1_3': {'min_key_length': 2048},
+    }
+
+    WEAK_PROTOCOLS = ['SSLv3', 'TLS_1_0', 'TLS_1_1']
+
+    @staticmethod
+    def check_encryption_strength(protocol: str, key_length: int) -> Dict[str, bool]:
+        """
+        Evaluate the encryption strength of a VPN protocol.
+
+        Args:
+            protocol (str): VPN encryption protocol
+            key_length (int): Key length in bits
+
+        Returns:
+            Dict[str, bool]: Assessment results with security status
+        """
+        results = {
+            'is_secure': False,
+            'recommendation': ''
+        }
+
+        # Check against known strong protocols
+        if protocol in VPNSecurityAssessment.STRONG_ENCRYPTION_PROTOCOLS:
+            min_key_length = VPNSecurityAssessment.STRONG_ENCRYPTION_PROTOCOLS[protocol]['min_key_length']
+
+            if key_length >= min_key_length:
+                results['is_secure'] = True
+                results['recommendation'] = f"Protocol {protocol} with {key_length}-bit key is considered secure."
+            else:
+                results['recommendation'] = (
+                    f"Upgrade {protocol} key length from {key_length} to at least {min_key_length} bits."
+                )
+
+        # Check against weak protocols
+        if protocol in VPNSecurityAssessment.WEAK_PROTOCOLS:
+            results['is_secure'] = False
+            results['recommendation'] = f"Avoid protocol {protocol}. It has known security vulnerabilities."
+
+        return results
+
+    @staticmethod
+    def detect_protocol_vulnerabilities(protocol: str) -> List[str]:
+        """
+        Detect known vulnerabilities in VPN protocols.
+
+        Args:
+            protocol (str): VPN protocol to check
+
+        Returns:
+            List[str]: List of detected vulnerabilities
+        """
+        vulnerabilities = []
+
+        # Sample vulnerability checks (expand with real-world CVEs)
+        if protocol == 'SSLv3':
+            vulnerabilities.append('POODLE attack vulnerability')
+
+        if protocol == 'TLS_1_0':
+            vulnerabilities.append('BEAST attack vulnerability')
+
+        return vulnerabilities
+
+    @staticmethod
+    def validate_cipher_suite(cipher_suite: str) -> Dict[str, bool]:
+        """
+        Validate the security of a VPN cipher suite.
+
+        Args:
+            cipher_suite (str): Cipher suite to evaluate
+
+        Returns:
+            Dict[str, bool]: Cipher suite security assessment
+        """
+        # Updated regex for strong cipher suites
+        strong_cipher_pattern = re.compile(r'(ECDHE|DHE).*(?:AES_256|AES256|GCM)')
+
+        return {
+            'is_secure': bool(strong_cipher_pattern.search(cipher_suite)),
+            'recommendation': (
+                'Use modern cipher suites with perfect forward secrecy '
+                'and strong encryption algorithms.'
+            )
+        }
+
+def perform_vpn_security_assessment(
+    protocol: str, 
+    key_length: int, 
+    cipher_suite: Optional[str] = None
+) -> Dict[str, Any]:
+    """
+    Comprehensive VPN security assessment function.
+
+    Args:
+        protocol (str): VPN protocol
+        key_length (int): Encryption key length
+        cipher_suite (Optional[str]): VPN cipher suite
+
+    Returns:
+        Dict[str, Any]: Comprehensive security assessment results
+    """
+    assessment = {
+        'encryption_strength': VPNSecurityAssessment.check_encryption_strength(protocol, key_length),
+        'protocol_vulnerabilities': VPNSecurityAssessment.detect_protocol_vulnerabilities(protocol)
+    }
+
+    if cipher_suite:
+        assessment['cipher_suite_security'] = VPNSecurityAssessment.validate_cipher_suite(cipher_suite)
+
+    return assessment

tests/__init__.py

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+# Test package initialization

tests/test_vpn_security.py

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+"""Test suite for VPN security assessment module."""
+
+import pytest
+from src.vpn_security import VPNSecurityAssessment, perform_vpn_security_assessment
+
+def test_check_encryption_strength_secure():
+    """Test encryption strength for secure protocols."""
+    result = VPNSecurityAssessment.check_encryption_strength('TLS_1_2', 2048)
+    assert result['is_secure'] is True
+    assert 'secure' in result['recommendation']
+
+def test_check_encryption_strength_weak():
+    """Test encryption strength for weak protocols."""
+    result = VPNSecurityAssessment.check_encryption_strength('SSLv3', 1024)
+    assert result['is_secure'] is False
+    assert 'Avoid' in result['recommendation']
+
+def test_detect_protocol_vulnerabilities():
+    """Test detection of protocol vulnerabilities."""
+    vulnerabilities = VPNSecurityAssessment.detect_protocol_vulnerabilities('SSLv3')
+    assert 'POODLE' in vulnerabilities[0]
+
+def test_validate_cipher_suite_secure():
+    """Test validation of secure cipher suites."""
+    result = VPNSecurityAssessment.validate_cipher_suite('ECDHE-RSA-AES256-GCM-SHA384')
+    assert result['is_secure'] is True
+
+def test_validate_cipher_suite_weak():
+    """Test validation of weak cipher suites."""
+    result = VPNSecurityAssessment.validate_cipher_suite('RC4-SHA')
+    assert result['is_secure'] is False
+
+def test_perform_vpn_security_assessment():
+    """Test comprehensive VPN security assessment."""
+    assessment = perform_vpn_security_assessment('TLS_1_2', 2048, 'ECDHE-RSA-AES256-GCM-SHA384')
+
+    assert 'encryption_strength' in assessment
+    assert 'protocol_vulnerabilities' in assessment
+    assert 'cipher_suite_security' in assessment
+
+    assert assessment['encryption_strength']['is_secure'] is True