# Implement key-based authentication
ssh_config = {
    'auth_method': 'key',
    'private_key_file': '/secure/path/id_rsa',
    'passphrase': encrypted_passphrase,
    'allowed_ciphers': ['aes256-gcm', 'chacha20-poly1305'],
    'kex_algorithms': ['curve25519-sha256', 'ecdh-sha2-nistp256']
}

# Implement configuration integrity checking
import hashlib
import hmac

def verify_config_integrity(config_file, signature_file):
    """Verify configuration hasn't been tampered"""
    with open(config_file, 'rb') as f:
        config_data = f.read()
    
    with open(signature_file, 'rb') as f:
        expected_signature = f.read()
    
    key = get_hmac_key()  # Securely retrieve HMAC key
    actual_signature = hmac.new(key, config_data, hashlib.sha256).digest()
    
    return hmac.compare_digest(actual_signature, expected_signature)

# Implement RTR security extensions
class SecureRTRHandler:
    def __init__(self):
        self.session_keys = {}
        self.nonce_cache = set()
    
    def validate_packet(self, packet):
        """Validate RTR packet authenticity"""
        # Check nonce to prevent replay
        if packet.nonce in self.nonce_cache:
            raise SecurityError("Replay attack detected")
        
        # Verify signature
        if not self.verify_signature(packet):
            raise SecurityError("Invalid packet signature")
        
        self.nonce_cache.add(packet.nonce)
        return True

class MFAAuthenticator:
    """
    Implement TOTP-based MFA for administrative access
    """
    def __init__(self):
        self.totp_secret = self.load_secret()
    
    def verify_token(self, token):
        """Verify TOTP token"""
        import pyotp
        
        totp = pyotp.TOTP(self.totp_secret)
        return totp.verify(token, valid_window=1)
    
    def authenticate(self, username, password, mfa_token):
        """Full authentication flow"""
        # Step 1: Verify credentials
        if not self.verify_credentials(username, password):
            return False
        
        # Step 2: Verify MFA token
        if not self.verify_token(mfa_token):
            return False
        
        # Step 3: Create secure session
        return self.create_session(username)

RBAC_PERMISSIONS = {
    'admin': ['read', 'write', 'reset', 'configure'],
    'operator': ['read', 'reset'],
    'viewer': ['read']
}

def check_permission(user_role, action):
    """Check if role has permission for action"""
    return action in RBAC_PERMISSIONS.get(user_role, [])

class KeyManager:
    """
    Secure key management system
    """
    def __init__(self):
        self.key_store = '/secure/keystore'
        self.master_key = self.derive_master_key()
    
    def derive_master_key(self):
        """Derive master key from hardware security module"""
        # In production, use HSM or TPM
        import os
        from cryptography.hazmat.primitives import hashes
        from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2
        
        salt = os.urandom(32)
        kdf = PBKDF2(
            algorithm=hashes.SHA256(),
            length=32,
            salt=salt,
            iterations=100000,
        )
        
        password = self.get_secure_password()  # From secure source
        return kdf.derive(password.encode())
    
    def rotate_keys(self):
        """Periodic key rotation"""
        old_key = self.master_key
        new_key = self.derive_master_key()
        
        # Re-encrypt all data with new key
        self.reencrypt_data(old_key, new_key)
        self.master_key = new_key
        
        # Securely destroy old key
        self.secure_delete(old_key)

def encrypt_sensitive_data(data, key):
    """
    Encrypt sensitive data using AES-256-GCM
    """
    from cryptography.hazmat.primitives.ciphers import (
        Cipher, algorithms, modes
    )
    import os
    
    # Generate nonce
    nonce = os.urandom(12)
    
    # Create cipher
    cipher = Cipher(
        algorithms.AES(key),
        modes.GCM(nonce)
    )
    
    # Encrypt
    encryptor = cipher.encryptor()
    ciphertext = encryptor.update(data) + encryptor.finalize()
    
    return nonce + encryptor.tag + ciphertext

class SecureCredentialStore:
    """
    Secure credential storage with hardware security module support
    """
    def __init__(self, use_hsm=True):
        self.use_hsm = use_hsm
        if use_hsm:
            self.hsm = self.init_hsm()
        else:
            self.key = self.load_local_key()
    
    def store_credential(self, name, credential):
        """Store credential securely"""
        # Encrypt credential
        encrypted = self.encrypt(credential)
        
        # Store with integrity check
        integrity = self.calculate_mac(encrypted)
        
        storage = {
            'data': encrypted,
            'mac': integrity,
            'timestamp': time.time(),
            'version': 1
        }
        
        # Save to secure storage
        self.save_secure(name, storage)
    
    def retrieve_credential(self, name):
        """Retrieve and verify credential"""
        storage = self.load_secure(name)
        
        # Verify integrity
        if not self.verify_mac(storage['data'], storage['mac']):
            raise SecurityError("Credential integrity check failed")
        
        # Check age
        age = time.time() - storage['timestamp']
        if age > 86400 * 30:  # 30 days
            raise SecurityError("Credential expired")
        
        # Decrypt
        return self.decrypt(storage['data'])

class PasswordPolicy:
    """
    Enforce strong password policy
    """
    MIN_LENGTH = 16
    REQUIRE_UPPER = True
    REQUIRE_LOWER = True
    REQUIRE_DIGIT = True
    REQUIRE_SPECIAL = True
    
    @classmethod
    def validate(cls, password):
        """Validate password against policy"""
        errors = []
        
        if len(password) < cls.MIN_LENGTH:
            errors.append(f"Minimum length {cls.MIN_LENGTH}")
        
        if cls.REQUIRE_UPPER and not any(c.isupper() for c in password):
            errors.append("Must contain uppercase")
        
        if cls.REQUIRE_LOWER and not any(c.islower() for c in password):
            errors.append("Must contain lowercase")
        
        if cls.REQUIRE_DIGIT and not any(c.isdigit() for c in password):
            errors.append("Must contain digit")
        
        if cls.REQUIRE_SPECIAL and not any(c in '!@#$%^&*()' for c in password):
            errors.append("Must contain special character")
        
        if errors:
            raise ValueError(f"Password policy violations: {', '.join(errors)}")
        
        return True

class AuditLogger:
    """
    Comprehensive audit logging system
    """
    def __init__(self):
        self.logger = self.setup_secure_logger()
        
    def setup_secure_logger(self):
        """Configure tamper-proof logging"""
        logger = logging.getLogger('audit')
        
        # Syslog handler for remote logging
        syslog = SysLogHandler(
            address=('syslog.example.com', 514),
            facility=SysLogHandler.LOG_AUTH
        )
        
        # Format with all required fields
        formatter = logging.Formatter(
            '%(asctime)s|%(hostname)s|%(user)s|%(action)s|'
            '%(resource)s|%(result)s|%(details)s'
        )
        
        syslog.setFormatter(formatter)
        logger.addHandler(syslog)
        
        return logger
    
    def log_event(self, event_type, **kwargs):
        """Log security event"""
        event = {
            'timestamp': datetime.utcnow().isoformat(),
            'event_type': event_type,
            'user': self.get_current_user(),
            'source_ip': self.get_source_ip(),
            'session_id': self.get_session_id(),
            **kwargs
        }
        
        # Sign event for integrity
        event['signature'] = self.sign_event(event)
        
        # Log to multiple destinations
        self.logger.info(json.dumps(event))
        self.store_in_database(event)
        
        # Alert on critical events
        if event_type in ['authentication_failure', 'unauthorized_access']:
            self.send_security_alert(event)

def generate_compliance_report():
    """
    Generate compliance report for auditors
    """
    report = {
        'generated_at': datetime.utcnow().isoformat(),
        'period': 'last_30_days',
        'compliance_frameworks': ['ISO27001', 'PCI-DSS', 'SOC2'],
        'controls': {}
    }
    
    # Access control compliance
    report['controls']['access_control'] = {
        'password_policy': check_password_policy_compliance(),
        'mfa_enabled': check_mfa_compliance(),
        'privileged_access': audit_privileged_access(),
        'access_reviews': get_access_review_status()
    }
    
    # Data protection compliance
    report['controls']['data_protection'] = {
        'encryption_at_rest': verify_encryption_at_rest(),
        'encryption_in_transit': verify_encryption_in_transit(),
        'key_rotation': check_key_rotation_compliance(),
        'data_retention': check_data_retention_compliance()
    }
    
    # Monitoring compliance
    report['controls']['monitoring'] = {
        'log_retention': check_log_retention(),
        'alert_response_time': calculate_alert_response_metrics(),
        'incident_resolution': get_incident_metrics(),
        'vulnerability_management': check_vulnerability_scanning()
    }
    
    return report

class IncidentResponsePlan:
    """
    Automated incident response system
    """
    
    SEVERITY_LEVELS = {
        'CRITICAL': 1,  # Immediate response required
        'HIGH': 2,      # Response within 1 hour
        'MEDIUM': 3,    # Response within 4 hours
        'LOW': 4        # Response within 24 hours
    }
    
    def detect_incident(self, event):
        """Detect potential security incident"""
        indicators = [
            self.check_authentication_anomalies(event),
            self.check_traffic_patterns(event),
            self.check_file_integrity(event),
            self.check_configuration_changes(event)
        ]
        
        if any(indicators):
            return self.create_incident(event, indicators)
        
        return None
    
    def respond_to_incident(self, incident):
        """Execute incident response playbook"""
        severity = self.assess_severity(incident)
        
        # Immediate actions
        if severity <= 2:  # CRITICAL or HIGH
            self.isolate_affected_systems(incident)
            self.preserve_evidence(incident)
            self.notify_security_team(incident)
        
        # Investigation
        investigation = self.investigate_incident(incident)
        
        # Containment
        self.contain_threat(incident, investigation)
        
        # Recovery
        self.recover_systems(incident)
        
        # Lessons learned
        self.document_incident(incident, investigation)

class SecurityMonitor:
    """
    Real-time security monitoring
    """
    
    def __init__(self):
        self.rules = self.load_detection_rules()
        self.baseline = self.establish_baseline()
        
    def monitor_authentication(self):
        """Monitor authentication events"""
        events = self.get_auth_events()
        
        for event in events:
            # Check for brute force
            if self.detect_brute_force(event):
                self.alert("Brute force attempt detected", event)
            
            # Check for credential stuffing
            if self.detect_credential_stuffing(event):
                self.alert("Credential stuffing detected", event)
            
            # Check for impossible travel
            if self.detect_impossible_travel(event):
                self.alert("Impossible travel detected", event)
    
    def monitor_network_traffic(self):
        """Monitor network anomalies"""
        traffic = self.capture_traffic()
        
        # Check for data exfiltration
        if self.detect_exfiltration(traffic):
            self.alert("Possible data exfiltration", traffic)
        
        # Check for command and control
        if self.detect_c2_traffic(traffic):
            self.alert("C2 traffic detected", traffic)

def send_to_siem(event):
    """
    Send security events to SIEM
    """
    siem_format = {
        'event_id': str(uuid.uuid4()),
        'timestamp': event['timestamp'],
        'source': 'HuaweiRPKICheck',
        'severity': event['severity'],
        'category': 'RPKI_Security',
        'description': event['description'],
        'details': event
    }
    
    # Send via syslog
    syslog.send(json.dumps(siem_format))
    
    # Send via API
    requests.post(
        'https://siem.example.com/api/events',
        json=siem_format,
        headers={'Authorization': f'Bearer {api_token}'}
    )