Zero Trust

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class ZeroTrustIdentity:
    def __init__(self):
        self.identity_providers = {}
        self.authentication_methods = {
            'password': {'strength': 'weak', 'mfa_required': True},
            'certificate': {'strength': 'strong', 'mfa_required': False},
            'biometric': {'strength': 'strong', 'mfa_required': False},
            'hardware_token': {'strength': 'strong', 'mfa_required': False}
        }
        self.risk_factors = {
            'location': 0.0,
            'device': 0.0,
            'behavior': 0.0,
            'time': 0.0
        }
    
    def authenticate_user(self, user_id, credentials, context):
        """Authenticate user with context"""
        # Verify credentials
        if not self.verify_credentials(user_id, credentials):
            return {'status': 'failed', 'reason': 'invalid_credentials'}
        
        # Evaluate risk context
        risk_score = self.calculate_risk_score(context)
        
        # Determine required authentication level
        auth_level = self.determine_auth_level(risk_score)
        
        # Verify multi-factor authentication if necessary
        if auth_level > 1:
            mfa_result = self.verify_mfa(user_id, credentials.get('mfa_code'))
            if not mfa_result:
                return {'status': 'failed', 'reason': 'mfa_required'}
        
        return {
            'status': 'success',
            'user_id': user_id,
            'risk_score': risk_score,
            'auth_level': auth_level,
            'session_token': self.generate_session_token(user_id, context)
        }
    
    def calculate_risk_score(self, context):
        """Calculate risk score based on context"""
        risk_score = 0.0
        
        # Location factor
        if context.get('location') == 'unknown':
            risk_score += 0.3
        elif context.get('location') == 'untrusted_network':
            risk_score += 0.2
        
        # Device factor
        if context.get('device_trust') == 'untrusted':
            risk_score += 0.3
        elif context.get('device_trust') == 'managed':
            risk_score += 0.1
        
        # Behavior factor
        if context.get('unusual_behavior'):
            risk_score += 0.2
        
        # Time factor
        if context.get('off_hours'):
            risk_score += 0.1
        
        return min(risk_score, 1.0)
    
    def determine_auth_level(self, risk_score):
        """Determine required authentication level"""
        if risk_score >= 0.7:
            return 3  # Strong authentication + MFA + additional verification
        elif risk_score >= 0.4:
            return 2  # Authentication + MFA
        else:
            return 1  # Basic authentication
    
    def verify_credentials(self, user_id, credentials):
        """Verify basic credentials"""
        # Simplified implementation
        return credentials.get('password') == 'valid_password'
    
    def verify_mfa(self, user_id, mfa_code):
        """Verify multi-factor authentication"""
        # Simplified implementation
        return mfa_code == '123456'
    
    def generate_session_token(self, user_id, context):
        """Generate session token"""
        import hashlib
        import time
        
        token_data = f"{user_id}_{context.get('device_id', 'unknown')}_{time.time()}"
        return hashlib.sha256(token_data.encode()).hexdigest()

# Usage example
identity_system = ZeroTrustIdentity()

# Access context
context = {
    'location': 'untrusted_network',
    'device_trust': 'untrusted',
    'unusual_behavior': False,
    'off_hours': False,
    'device_id': 'device_123'
}

# Credentials
credentials = {
    'password': 'valid_password',
    'mfa_code': '123456'
}

# Authenticate user
result = identity_system.authenticate_user('user_001', credentials, context)
print(f"Authentication result: {result}")

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class ZeroTrustDevice:
    def __init__(self):
        self.device_registry = {}
        self.device_trust_levels = {
            'trusted': 1.0,
            'managed': 0.7,
            'untrusted': 0.3,
            'unknown': 0.0
        }
        self.compliance_checks = {
            'os_version': True,
            'antivirus': True,
            'firewall': True,
            'encryption': True,
            'patches': True
        }
    
    def register_device(self, device_id, device_info):
        """Register device"""
        self.device_registry[device_id] = {
            'device_id': device_id,
            'device_type': device_info.get('type', 'unknown'),
            'os': device_info.get('os', 'unknown'),
            'os_version': device_info.get('os_version', 'unknown'),
            'trust_level': 'unknown',
            'compliance_status': {},
            'last_seen': None,
            'risk_score': 0.0
        }
    
    def assess_device_trust(self, device_id):
        """Assess device trust"""
        if device_id not in self.device_registry:
            return None
        
        device = self.device_registry[device_id]
        trust_score = 0.0
        
        # Verify compliance
        compliance_score = self.check_compliance(device_id)
        trust_score += compliance_score * 0.6
        
        # Verify device type
        device_type = device.get('device_type', 'unknown')
        if device_type in ['corporate_laptop', 'corporate_phone']:
            trust_score += 0.3
        elif device_type in ['personal_laptop', 'personal_phone']:
            trust_score += 0.1
        
        # Verify operating system
        os = device.get('os', 'unknown')
        if os in ['Windows 11', 'macOS 13', 'iOS 16', 'Android 13']:
            trust_score += 0.1
        
        # Determine trust level
        if trust_score >= 0.8:
            device['trust_level'] = 'trusted'
        elif trust_score >= 0.6:
            device['trust_level'] = 'managed'
        elif trust_score >= 0.3:
            device['trust_level'] = 'untrusted'
        else:
            device['trust_level'] = 'unknown'
        
        device['risk_score'] = 1.0 - trust_score
        return device['trust_level']
    
    def check_compliance(self, device_id):
        """Verify device compliance"""
        if device_id not in self.device_registry:
            return 0.0
        
        device = self.device_registry[device_id]
        compliance_score = 0.0
        
        # Verify each compliance aspect
        for check, required in self.compliance_checks.items():
            if device.get(f'compliance_{check}', False) == required:
                compliance_score += 1.0
        
        return compliance_score / len(self.compliance_checks)
    
    def update_device_status(self, device_id, status_updates):
        """Update device status"""
        if device_id in self.device_registry:
            device = self.device_registry[device_id]
            device.update(status_updates)
            device['last_seen'] = datetime.now()
            
            # Re-assess trust
            self.assess_device_trust(device_id)

# Usage example
device_system = ZeroTrustDevice()

# Register device
device_system.register_device('device_001', {
    'type': 'corporate_laptop',
    'os': 'Windows',
    'os_version': 'Windows 11',
    'compliance_os_version': True,
    'compliance_antivirus': True,
    'compliance_firewall': True,
    'compliance_encryption': True,
    'compliance_patches': True
})

# Assess trust
trust_level = device_system.assess_device_trust('device_001')
print(f"Device trust level: {trust_level}")

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class ZeroTrustNetwork:
    def __init__(self):
        self.network_segments = {}
        self.micro_segments = {}
        self.access_policies = {}
        self.traffic_monitoring = {}
    
    def create_network_segment(self, segment_id, segment_config):
        """Create network segment"""
        self.network_segments[segment_id] = {
            'segment_id': segment_id,
            'name': segment_config['name'],
            'subnet': segment_config['subnet'],
            'trust_level': segment_config.get('trust_level', 'untrusted'),
            'isolation_level': segment_config.get('isolation_level', 'high'),
            'allowed_protocols': segment_config.get('protocols', []),
            'allowed_ports': segment_config.get('ports', []),
            'encryption_required': segment_config.get('encryption_required', True)
        }
    
    def create_micro_segment(self, micro_segment_id, parent_segment, config):
        """Create micro-segment"""
        self.micro_segments[micro_segment_id] = {
            'micro_segment_id': micro_segment_id,
            'parent_segment': parent_segment,
            'name': config['name'],
            'resources': config.get('resources', []),
            'access_rules': config.get('access_rules', []),
            'monitoring_enabled': config.get('monitoring', True)
        }
    
    def define_access_policy(self, policy_id, policy_config):
        """Define access policy"""
        self.access_policies[policy_id] = {
            'policy_id': policy_id,
            'name': policy_config['name'],
            'source_segment': policy_config['source_segment'],
            'destination_segment': policy_config['destination_segment'],
            'allowed_users': policy_config.get('allowed_users', []),
            'allowed_devices': policy_config.get('allowed_devices', []),
            'required_conditions': policy_config.get('conditions', []),
            'time_restrictions': policy_config.get('time_restrictions', {}),
            'enabled': policy_config.get('enabled', True)
        }
    
    def evaluate_access_request(self, user_id, device_id, source_segment, destination_segment, resource):
        """Evaluate access request"""
        # Verify access policies
        applicable_policies = self.get_applicable_policies(
            source_segment, destination_segment
        )
        
        for policy_id, policy in applicable_policies.items():
            if not policy['enabled']:
                continue
            
            # Verify allowed users
            if policy['allowed_users'] and user_id not in policy['allowed_users']:
                continue
            
            # Verify allowed devices
            if policy['allowed_devices'] and device_id not in policy['allowed_devices']:
                continue
            
            # Verify required conditions
            if not self.check_conditions(policy['required_conditions'], user_id, device_id):
                continue
            
            # Verify time restrictions
            if not self.check_time_restrictions(policy['time_restrictions']):
                continue
            
            return {
                'access_granted': True,
                'policy_id': policy_id,
                'conditions': policy['required_conditions']
            }
        
        return {
            'access_granted': False,
            'reason': 'no_matching_policy'
        }
    
    def get_applicable_policies(self, source_segment, destination_segment):
        """Get applicable policies"""
        applicable = {}
        
        for policy_id, policy in self.access_policies.items():
            if (policy['source_segment'] == source_segment and 
                policy['destination_segment'] == destination_segment):
                applicable[policy_id] = policy
        
        return applicable
    
    def check_conditions(self, conditions, user_id, device_id):
        """Verify required conditions"""
        # Simplified implementation
        for condition in conditions:
            if condition == 'mfa_required':
                # Verify if MFA is enabled
                pass
            elif condition == 'device_trusted':
                # Verify if device is trusted
                pass
        
        return True
    
    def check_time_restrictions(self, time_restrictions):
        """Verify time restrictions"""
        if not time_restrictions:
            return True
        
        current_time = datetime.now().time()
        
        if 'allowed_hours' in time_restrictions:
            start_time = time_restrictions['allowed_hours']['start']
            end_time = time_restrictions['allowed_hours']['end']
            
            if not (start_time <= current_time <= end_time):
                return False
        
        return True

# Usage example
network_system = ZeroTrustNetwork()

# Create network segments
network_system.create_network_segment('corp_network', {
    'name': 'Corporate Network',
    'subnet': '10.0.0.0/8',
    'trust_level': 'trusted',
    'isolation_level': 'medium',
    'protocols': ['TCP', 'UDP', 'ICMP'],
    'ports': [80, 443, 22, 3389],
    'encryption_required': True
})

network_system.create_network_segment('dmz', {
    'name': 'DMZ',
    'subnet': '192.168.1.0/24',
    'trust_level': 'untrusted',
    'isolation_level': 'high',
    'protocols': ['TCP'],
    'ports': [80, 443],
    'encryption_required': True
})

# Define access policy
network_system.define_access_policy('POL-001', {
    'name': 'Corp to DMZ Access',
    'source_segment': 'corp_network',
    'destination_segment': 'dmz',
    'allowed_users': ['admin', 'developer'],
    'allowed_devices': ['device_001'],
    'conditions': ['mfa_required', 'device_trusted'],
    'time_restrictions': {
        'allowed_hours': {'start': '08:00', 'end': '18:00'}
    }
})

# Evaluate access request
access_result = network_system.evaluate_access_request(
    'admin', 'device_001', 'corp_network', 'dmz', 'web_server'
)
print(f"Access result: {access_result}")

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class ZeroTrustApplication:
    def __init__(self):
        self.applications = {}
        self.data_classification = {
            'public': 1,
            'internal': 2,
            'confidential': 3,
            'restricted': 4
        }
        self.access_controls = {}
        self.data_encryption = {}
    
    def register_application(self, app_id, app_config):
        """Register application"""
        self.applications[app_id] = {
            'app_id': app_id,
            'name': app_config['name'],
            'data_classification': app_config.get('data_classification', 'internal'),
            'encryption_required': app_config.get('encryption_required', True),
            'access_controls': app_config.get('access_controls', []),
            'api_endpoints': app_config.get('api_endpoints', []),
            'trust_level': 'untrusted'
        }
    
    def classify_data(self, data_id, data_type, sensitivity_level):
        """Classify data"""
        classification = {
            'data_id': data_id,
            'data_type': data_type,
            'sensitivity_level': sensitivity_level,
            'classification_score': self.data_classification.get(sensitivity_level, 1),
            'encryption_required': sensitivity_level in ['confidential', 'restricted'],
            'access_restrictions': self.get_access_restrictions(sensitivity_level)
        }
        
        return classification
    
    def get_access_restrictions(self, sensitivity_level):
        """Get access restrictions by sensitivity level"""
        restrictions = {
            'public': [],
            'internal': ['authenticated_user'],
            'confidential': ['authenticated_user', 'role_based_access', 'mfa_required'],
            'restricted': ['authenticated_user', 'role_based_access', 'mfa_required', 'device_trusted', 'time_restricted']
        }
        
        return restrictions.get(sensitivity_level, [])
    
    def evaluate_data_access(self, user_id, device_id, data_id, requested_operation):
        """Evaluate data access"""
        # Get data classification
        data_classification = self.get_data_classification(data_id)
        if not data_classification:
            return {'access_granted': False, 'reason': 'data_not_found'}
        
        # Verify access restrictions
        restrictions = data_classification['access_restrictions']
        
        for restriction in restrictions:
            if restriction == 'authenticated_user':
                if not self.verify_authentication(user_id):
                    return {'access_granted': False, 'reason': 'authentication_required'}
            
            elif restriction == 'role_based_access':
                if not self.verify_role_access(user_id, data_id):
                    return {'access_granted': False, 'reason': 'insufficient_role'}
            
            elif restriction == 'mfa_required':
                if not self.verify_mfa(user_id):
                    return {'access_granted': False, 'reason': 'mfa_required'}
            
            elif restriction == 'device_trusted':
                if not self.verify_device_trust(device_id):
                    return {'access_granted': False, 'reason': 'untrusted_device'}
            
            elif restriction == 'time_restricted':
                if not self.verify_time_restrictions():
                    return {'access_granted': False, 'reason': 'time_restricted'}
        
        # Verify allowed operation
        if not self.verify_operation_allowed(data_classification, requested_operation):
            return {'access_granted': False, 'reason': 'operation_not_allowed'}
        
        return {
            'access_granted': True,
            'data_classification': data_classification['sensitivity_level'],
            'encryption_required': data_classification['encryption_required']
        }
    
    def get_data_classification(self, data_id):
        """Get data classification"""
        # Simplified implementation
        return {
            'data_id': data_id,
            'sensitivity_level': 'confidential',
            'access_restrictions': ['authenticated_user', 'role_based_access', 'mfa_required'],
            'encryption_required': True
        }
    
    def verify_authentication(self, user_id):
        """Verify user authentication"""
        return True  # Simplified implementation
    
    def verify_role_access(self, user_id, data_id):
        """Verify role-based access"""
        return True  # Simplified implementation
    
    def verify_mfa(self, user_id):
        """Verify MFA"""
        return True  # Simplified implementation
    
    def verify_device_trust(self, device_id):
        """Verify device trust"""
        return True  # Simplified implementation
    
    def verify_time_restrictions(self):
        """Verify time restrictions"""
        return True  # Simplified implementation
    
    def verify_operation_allowed(self, data_classification, operation):
        """Verify if operation is allowed"""
        allowed_operations = {
            'public': ['read', 'write', 'delete'],
            'internal': ['read', 'write'],
            'confidential': ['read'],
            'restricted': ['read']
        }
        
        sensitivity = data_classification['sensitivity_level']
        allowed = allowed_operations.get(sensitivity, [])
        
        return operation in allowed

# Usage example
app_system = ZeroTrustApplication()

# Register application
app_system.register_application('app_001', {
    'name': 'Customer Database',
    'data_classification': 'confidential',
    'encryption_required': True,
    'access_controls': ['role_based_access', 'mfa_required']
})

# Classify data
data_classification = app_system.classify_data('data_001', 'customer_info', 'confidential')
print(f"Data classification: {data_classification}")

# Evaluate data access
access_result = app_system.evaluate_data_access(
    'user_001', 'device_001', 'data_001', 'read'
)
print(f"Data access result: {access_result}")

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class ZeroTrustImplementation:
    def __init__(self):
        self.implementation_phases = {
            'Phase_1': {
                'name': 'Identity and Access',
                'duration': '3-6 months',
                'components': [
                    'Identity and Access Management (IAM)',
                    'Multi-Factor Authentication (MFA)',
                    'Single Sign-On (SSO)',
                    'Privileged Access Management (PAM)'
                ],
                'success_metrics': [
                    '100% MFA adoption',
                    'Zero shared accounts',
                    'Automated provisioning/deprovisioning'
                ]
            },
            'Phase_2': {
                'name': 'Devices and Networks',
                'duration': '6-9 months',
                'components': [
                    'Device Management',
                    'Network Segmentation',
                    'Micro-segmentation',
                    'Software-Defined Perimeter (SDP)'
                ],
                'success_metrics': [
                    '100% device visibility',
                    'Network segmentation complete',
                    'Zero lateral movement'
                ]
            },
            'Phase_3': {
                'name': 'Applications and Data',
                'duration': '9-12 months',
                'components': [
                    'Application Security',
                    'Data Classification',
                    'Data Loss Prevention (DLP)',
                    'API Security'
                ],
                'success_metrics': [
                    '100% data classification',
                    'Zero data exfiltration',
                    'API security implemented'
                ]
            },
            'Phase_4': {
                'name': 'Monitoring and Automation',
                'duration': '12-18 months',
                'components': [
                    'Security Orchestration',
                    'Automated Response',
                    'Continuous Monitoring',
                    'Threat Intelligence'
                ],
                'success_metrics': [
                    'Automated incident response',
                    'Real-time threat detection',
                    'Zero manual security tasks'
                ]
            }
        }
    
    def get_implementation_plan(self, current_phase='Phase_1'):
        """Get implementation plan"""
        phases = list(self.implementation_phases.keys())
        current_index = phases.index(current_phase) if current_phase in phases else 0
        
        return {
            'current_phase': current_phase,
            'remaining_phases': phases[current_index:],
            'total_duration': self.calculate_total_duration(phases[current_index:]),
            'next_phase': phases[current_index + 1] if current_index + 1 < len(phases) else None
        }
    
    def calculate_total_duration(self, phases):
        """Calculate total duration"""
        total_months = 0
        for phase in phases:
            duration = self.implementation_phases[phase]['duration']
            months = int(duration.split('-')[1].split()[0])
            total_months += months
        
        return f"{total_months} months"
    
    def get_phase_details(self, phase):
        """Get phase details"""
        return self.implementation_phases.get(phase, {})

# Usage example
zt_implementation = ZeroTrustImplementation()
plan = zt_implementation.get_implementation_plan('Phase_2')
print(f"Implementation plan: {plan}")

phase_details = zt_implementation.get_phase_details('Phase_1')
print(f"Phase 1 details: {phase_details['name']}")