🔒 Security Deep Dive - TuskLang for C# - "Fortress of Security"

Master TuskLang security - From basic encryption to enterprise-grade security patterns!

Security is paramount in modern applications. Learn how to build secure, compliant, and robust TuskLang configurations that protect sensitive data and withstand sophisticated attacks.

🎯 Security Philosophy

"We Don't Bow to Any King"

- Defense in depth - Multiple layers of security protection - Zero trust - Never trust, always verify - Principle of least privilege - Minimal access required - Security by design - Security built into every layer - Continuous monitoring - Real-time security monitoring

Why Security Matters?

- Data protection - Protect sensitive user and business data - Compliance - Meet regulatory requirements (GDPR, HIPAA, SOX) - Trust - Build user confidence and trust - Risk mitigation - Prevent costly security breaches - Business continuity - Ensure uninterrupted operations

🔐 Encryption and Key Management

Advanced Encryption Service

// AdvancedEncryptionService.cs
using TuskLang;
using TuskLang.Security;
using System.Security.Cryptography;
using Microsoft.Extensions.Options;
public class AdvancedEncryptionService
{
    private readonly TuskLang _parser;
    private readonly IKeyVaultService _keyVault;
    private readonly IEncryptionProvider _encryptionProvider;
    private readonly ILogger<AdvancedEncryptionService> _logger;
    
    public AdvancedEncryptionService(
        IKeyVaultService keyVault,
        IEncryptionProvider encryptionProvider,
        ILogger<AdvancedEncryptionService> logger)
    {
        _parser = new TuskLang();
        _keyVault = keyVault;
        _encryptionProvider = encryptionProvider;
        _logger = logger;
        
        // Configure parser with advanced security
        _parser.SetEncryptionProvider(_encryptionProvider);
        _parser.SetSecurityProvider(new AdvancedSecurityProvider(_keyVault));
    }
    
    public async Task<Dictionary<string, object>> GetSecureConfigurationAsync(string filePath)
    {
        try
        {
            // Validate file security
            await ValidateFileSecurityAsync(filePath);
            
            // Parse configuration with security context
            var config = _parser.ParseFile(filePath);
            
            // Apply security policies
            await ApplySecurityPoliciesAsync(config);
            
            // Audit security access
            await AuditSecurityAccessAsync(filePath, "read");
            
            return config;
        }
        catch (SecurityException ex)
        {
            _logger.LogError(ex, "Security violation detected: {Message}", ex.Message);
            throw;
        }
    }
    
    private async Task ValidateFileSecurityAsync(string filePath)
    {
        // Check file permissions
        var fileInfo = new FileInfo(filePath);
        if (!IsFileSecure(fileInfo))
        {
            throw new SecurityException($"Insecure file permissions: {filePath}");
        }
        
        // Validate file signature
        if (!await ValidateFileSignatureAsync(filePath))
        {
            throw new SecurityException($"Invalid file signature: {filePath}");
        }
        
        // Check for sensitive data exposure
        var content = await File.ReadAllTextAsync(filePath);
        if (ContainsSensitiveData(content))
        {
            throw new SecurityException($"Sensitive data detected in file: {filePath}");
        }
    }
    
    private bool IsFileSecure(FileInfo fileInfo)
    {
        // Check file permissions (Unix-like systems)
        if (Environment.OSVersion.Platform == PlatformID.Unix)
        {
            var unixFileInfo = Mono.Unix.UnixFileInfo.GetFileSystemEntry(fileInfo.FullName);
            var permissions = unixFileInfo.FileAccessPermissions;
            
            // Only owner should have read/write access
            return (permissions & Mono.Unix.FileAccessPermissions.OtherRead) == 0 &&
                   (permissions & Mono.Unix.FileAccessPermissions.OtherWrite) == 0 &&
                   (permissions & Mono.Unix.FileAccessPermissions.GroupRead) == 0 &&
                   (permissions & Mono.Unix.FileAccessPermissions.GroupWrite) == 0;
        }
        
        // Windows file security check
        var security = fileInfo.GetAccessControl();
        var rules = security.GetAccessRules(true, true, typeof(System.Security.Principal.SecurityIdentifier));
        
        // Check for overly permissive rules
        foreach (FileSystemAccessRule rule in rules)
        {
            if (rule.AccessControlType == AccessControlType.Allow &&
                (rule.FileSystemRights & FileSystemRights.FullControl) == FileSystemRights.FullControl)
            {
                return false;
            }
        }
        
        return true;
    }
    
    private async Task<bool> ValidateFileSignatureAsync(string filePath)
    {
        try
        {
            // Calculate file hash
            using var sha256 = SHA256.Create();
            using var stream = File.OpenRead(filePath);
            var hash = await sha256.ComputeHashAsync(stream);
            var hashString = Convert.ToBase64String(hash);
            
            // Get expected hash from secure storage
            var expectedHash = await _keyVault.GetSecretAsync($"file_hash_{Path.GetFileName(filePath)}");
            
            return hashString == expectedHash;
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Failed to validate file signature: {FilePath}", filePath);
            return false;
        }
    }
    
    private bool ContainsSensitiveData(string content)
    {
        // Check for common sensitive data patterns
        var sensitivePatterns = new[]
        {
            @"password\s[:=]\s['""][^'""]+['""]",
            @"api_key\s[:=]\s['""][^'""]+['""]",
            @"secret\s[:=]\s['""][^'""]+['""]",
            @"token\s[:=]\s['""][^'""]+['""]",
            @"private_key\s[:=]\s['""][^'""]+['""]"
        };
        
        return sensitivePatterns.Any(pattern => Regex.IsMatch(content, pattern, RegexOptions.IgnoreCase));
    }
    
    private async Task ApplySecurityPoliciesAsync(Dictionary<string, object> config)
    {
        // Apply data classification
        await ApplyDataClassificationAsync(config);
        
        // Apply access controls
        await ApplyAccessControlsAsync(config);
        
        // Apply encryption policies
        await ApplyEncryptionPoliciesAsync(config);
        
        // Apply audit policies
        await ApplyAuditPoliciesAsync(config);
    }
    
    private async Task ApplyDataClassificationAsync(Dictionary<string, object> config)
    {
        var dataClassification = new Dictionary<string, string>
        {
            ["users"] = "PII",
            ["payments"] = "PCI",
            ["health"] = "PHI",
            ["financial"] = "SOX",
            ["internal"] = "INTERNAL"
        };
        
        foreach (var classification in dataClassification)
        {
            if (config.ContainsKey(classification.Key))
            {
                config[$"{classification.Key}_classification"] = classification.Value;
                
                // Apply classification-specific security
                switch (classification.Value)
                {
                    case "PII":
                        await ApplyPIISecurityAsync(config[classification.Key] as Dictionary<string, object>);
                        break;
                    case "PCI":
                        await ApplyPCISecurityAsync(config[classification.Key] as Dictionary<string, object>);
                        break;
                    case "PHI":
                        await ApplyPHISecurityAsync(config[classification.Key] as Dictionary<string, object>);
                        break;
                }
            }
        }
    }
    
    private async Task ApplyPIISecurityAsync(Dictionary<string, object>? userData)
    {
        if (userData == null) return;
        
        // Encrypt sensitive PII fields
        var sensitiveFields = new[] { "email", "phone", "ssn", "address" };
        
        foreach (var field in sensitiveFields)
        {
            if (userData.ContainsKey(field))
            {
                var encryptedValue = await _encryptionProvider.EncryptAsync(
                    userData[field].ToString(), 
                    "AES-256-GCM"
                );
                userData[field] = encryptedValue;
            }
        }
        
        // Add data retention policy
        userData["retention_policy"] = "7_years";
        userData["encryption_required"] = true;
    }
    
    private async Task ApplyPCISecurityAsync(Dictionary<string, object>? paymentData)
    {
        if (paymentData == null) return;
        
        // Encrypt PCI data
        var pciFields = new[] { "card_number", "cvv", "expiry_date" };
        
        foreach (var field in pciFields)
        {
            if (paymentData.ContainsKey(field))
            {
                var encryptedValue = await _encryptionProvider.EncryptAsync(
                    paymentData[field].ToString(), 
                    "AES-256-GCM"
                );
                paymentData[field] = encryptedValue;
            }
        }
        
        // Add PCI compliance settings
        paymentData["pci_compliant"] = true;
        paymentData["tokenization_required"] = true;
        paymentData["audit_logging"] = true;
    }
    
    private async Task ApplyPHISecurityAsync(Dictionary<string, object>? healthData)
    {
        if (healthData == null) return;
        
        // Encrypt PHI data
        var phiFields = new[] { "diagnosis", "medication", "treatment_plan" };
        
        foreach (var field in phiFields)
        {
            if (healthData.ContainsKey(field))
            {
                var encryptedValue = await _encryptionProvider.EncryptAsync(
                    healthData[field].ToString(), 
                    "AES-256-GCM"
                );
                healthData[field] = encryptedValue;
            }
        }
        
        // Add HIPAA compliance settings
        healthData["hipaa_compliant"] = true;
        healthData["access_logging"] = true;
        healthData["audit_trail"] = true;
    }
    
    private async Task ApplyAccessControlsAsync(Dictionary<string, object> config)
    {
        // Apply role-based access control
        config["access_control"] = new Dictionary<string, object>
        {
            ["admin_roles"] = new[] { "admin", "super_admin" },
            ["user_roles"] = new[] { "user", "manager" },
            ["read_only_roles"] = new[] { "viewer", "auditor" }
        };
        
        // Apply resource-based access control
        config["resource_permissions"] = new Dictionary<string, object>
        {
            ["users"] = new[] { "admin", "hr_manager" },
            ["payments"] = new[] { "admin", "finance_manager" },
            ["health"] = new[] { "admin", "healthcare_provider" }
        };
    }
    
    private async Task ApplyEncryptionPoliciesAsync(Dictionary<string, object> config)
    {
        // Apply encryption policies
        config["encryption_policies"] = new Dictionary<string, object>
        {
            ["algorithm"] = "AES-256-GCM",
            ["key_rotation"] = "90_days",
            ["key_storage"] = "key_vault",
            ["encryption_at_rest"] = true,
            ["encryption_in_transit"] = true
        };
        
        // Apply key management policies
        config["key_management"] = new Dictionary<string, object>
        {
            ["key_vault_url"] = await _keyVault.GetVaultUrlAsync(),
            ["key_rotation_interval"] = "90_days",
            ["backup_keys"] = true,
            ["key_recovery"] = true
        };
    }
    
    private async Task ApplyAuditPoliciesAsync(Dictionary<string, object> config)
    {
        // Apply audit policies
        config["audit_policies"] = new Dictionary<string, object>
        {
            ["enabled"] = true,
            ["log_level"] = "detailed",
            ["retention_period"] = "7_years",
            ["real_time_monitoring"] = true,
            ["alert_on_violations"] = true
        };
        
        // Apply compliance policies
        config["compliance"] = new Dictionary<string, object>
        {
            ["gdpr"] = true,
            ["hipaa"] = true,
            ["pci_dss"] = true,
            ["sox"] = true
        };
    }
    
    private async Task AuditSecurityAccessAsync(string filePath, string operation)
    {
        var auditEvent = new SecurityAuditEvent
        {
            Timestamp = DateTime.UtcNow,
            User = Environment.UserName,
            Operation = operation,
            Resource = filePath,
            IPAddress = GetClientIPAddress(),
            UserAgent = GetUserAgent(),
            Success = true
        };
        
        await _keyVault.LogAuditEventAsync(auditEvent);
    }
    
    private string GetClientIPAddress()
    {
        // In a web application, this would come from the HTTP context
        return "127.0.0.1"; // Placeholder
    }
    
    private string GetUserAgent()
    {
        // In a web application, this would come from the HTTP context
        return "TuskLang-Security-Service"; // Placeholder
    }
}
public class SecurityAuditEvent
{
    public DateTime Timestamp { get; set; }
    public string User { get; set; } = string.Empty;
    public string Operation { get; set; } = string.Empty;
    public string Resource { get; set; } = string.Empty;
    public string IPAddress { get; set; } = string.Empty;
    public string UserAgent { get; set; } = string.Empty;
    public bool Success { get; set; }
    public string? ErrorMessage { get; set; }
}

Advanced Security TSK Configuration

security-deep-dive.tsk - Advanced security configuration
$security_level: @env("SECURITY_LEVEL", "high")
$compliance_standard: @env("COMPLIANCE_STANDARD", "gdpr")
$encryption_algorithm: @env("ENCRYPTION_ALGORITHM", "AES-256-GCM")
[security]
level: $security_level
compliance: $compliance_standard
algorithm: $encryption_algorithm
[encryption]
Encryption policies
algorithm: $encryption_algorithm
key_rotation: "90_days"
key_storage: "key_vault"
encryption_at_rest: true
encryption_in_transit: true
Key management
key_vault_url: @env.secure("KEY_VAULT_URL")
master_key: @env.secure("MASTER_ENCRYPTION_KEY")
backup_keys: true
key_recovery: true
[authentication]
Multi-factor authentication
mfa_required: @if($security_level == "high", true, false)
mfa_methods: ["totp", "sms", "email"]
session_timeout: @if($security_level == "high", "15m", "1h")
max_login_attempts: @if($security_level == "high", 3, 5)
OAuth configuration
oauth_providers {
    google {
        client_id: @env.secure("GOOGLE_CLIENT_ID")
        client_secret: @env.secure("GOOGLE_CLIENT_SECRET")
        scopes: ["openid", "email", "profile"]
    }
    microsoft {
        client_id: @env.secure("MICROSOFT_CLIENT_ID")
        client_secret: @env.secure("MICROSOFT_CLIENT_SECRET")
        scopes: ["openid", "email", "profile"]
    }
}
[authorization]
Role-based access control
roles {
    admin {
        permissions: ["read", "write", "delete", "admin"]
        resources: ["*"]
    }
    manager {
        permissions: ["read", "write"]
        resources: ["users", "reports", "settings"]
    }
    user {
        permissions: ["read"]
        resources: ["own_data", "public_data"]
    }
    auditor {
        permissions: ["read", "audit"]
        resources: ["audit_logs", "compliance_reports"]
    }
}
Resource-based access control
resource_permissions {
    users {
        admin: ["read", "write", "delete"]
        hr_manager: ["read", "write"]
        user: ["read_own"]
    }
    payments {
        admin: ["read", "write", "delete"]
        finance_manager: ["read", "write"]
        user: ["read_own"]
    }
    health {
        admin: ["read", "write", "delete"]
        healthcare_provider: ["read", "write"]
        user: ["read_own"]
    }
}
[data_classification]
Data classification and handling
pii {
    classification: "PII"
    encryption_required: true
    retention_policy: "7_years"
    access_logging: true
    fields: ["email", "phone", "ssn", "address"]
}
pci {
    classification: "PCI"
    encryption_required: true
    tokenization_required: true
    retention_policy: "3_years"
    audit_logging: true
    fields: ["card_number", "cvv", "expiry_date"]
}
phi {
    classification: "PHI"
    encryption_required: true
    hipaa_compliant: true
    retention_policy: "7_years"
    access_logging: true
    fields: ["diagnosis", "medication", "treatment_plan"]
}
[audit]
Audit and compliance
enabled: true
log_level: "detailed"
retention_period: "7_years"
real_time_monitoring: true
alert_on_violations: true
Audit events
events {
    authentication: true
    authorization: true
    data_access: true
    configuration_changes: true
    security_violations: true
}
Compliance reporting
compliance {
    gdpr: true
    hipaa: true
    pci_dss: true
    sox: true
    reporting_interval: "monthly"
}
[threat_detection]
Threat detection and prevention
enabled: true
real_time_scanning: true
anomaly_detection: true
rate_limiting: true
Threat indicators
indicators {
    brute_force: true
    sql_injection: true
    xss_attack: true
    privilege_escalation: true
    data_exfiltration: true
}
Response actions
response_actions {
    block_ip: true
    lock_account: true
    alert_admin: true
    log_violation: true
    quarantine_data: true
}
[network_security]
Network security
ssl_required: true
tls_version: "1.3"
certificate_validation: true
hsts_enabled: true
Firewall rules
firewall {
    allowed_ips: @env("ALLOWED_IPS").split(",")
    blocked_ips: @env("BLOCKED_IPS").split(",")
    rate_limiting: true
    ddos_protection: true
}
VPN and secure connections
vpn {
    required: @if($security_level == "high", true, false)
    endpoint: @env.secure("VPN_ENDPOINT")
    certificate: @env.secure("VPN_CERTIFICATE")
}

🛡️ Threat Detection and Prevention

Advanced Threat Detection Service

// ThreatDetectionService.cs
using TuskLang;
using TuskLang.Security;
using Microsoft.Extensions.Hosting;
public class ThreatDetectionService : BackgroundService
{
    private readonly TuskLang _parser;
    private readonly IThreatDetector _threatDetector;
    private readonly ISecurityAlertService _alertService;
    private readonly ILogger<ThreatDetectionService> _logger;
    
    public ThreatDetectionService(
        IThreatDetector threatDetector,
        ISecurityAlertService alertService,
        ILogger<ThreatDetectionService> logger)
    {
        _parser = new TuskLang();
        _threatDetector = threatDetector;
        _alertService = alertService;
        _logger = logger;
    }
    
    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        while (!stoppingToken.IsCancellationRequested)
        {
            try
            {
                // Perform real-time threat detection
                await PerformThreatDetectionAsync();
                
                // Check for anomalies
                await CheckForAnomaliesAsync();
                
                // Update threat intelligence
                await UpdateThreatIntelligenceAsync();
                
                await Task.Delay(TimeSpan.FromSeconds(30), stoppingToken);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Threat detection failed");
                await Task.Delay(TimeSpan.FromSeconds(60), stoppingToken);
            }
        }
    }
    
    private async Task PerformThreatDetectionAsync()
    {
        // Detect brute force attacks
        await DetectBruteForceAttacksAsync();
        
        // Detect SQL injection attempts
        await DetectSQLInjectionAsync();
        
        // Detect XSS attacks
        await DetectXSSAttacksAsync();
        
        // Detect privilege escalation
        await DetectPrivilegeEscalationAsync();
        
        // Detect data exfiltration
        await DetectDataExfiltrationAsync();
    }
    
    private async Task DetectBruteForceAttacksAsync()
    {
        var failedLogins = await _threatDetector.GetFailedLoginsAsync(TimeSpan.FromMinutes(5));
        
        foreach (var login in failedLogins)
        {
            if (login.FailedAttempts > 5)
            {
                var threat = new SecurityThreat
                {
                    Type = ThreatType.BruteForce,
                    Source = login.IPAddress,
                    Target = login.Username,
                    Severity = ThreatSeverity.High,
                    Timestamp = DateTime.UtcNow,
                    Details = $"Multiple failed login attempts: {login.FailedAttempts}"
                };
                
                await _alertService.RaiseAlertAsync(threat);
                await _threatDetector.BlockIPAsync(login.IPAddress, TimeSpan.FromMinutes(30));
            }
        }
    }
    
    private async Task DetectSQLInjectionAsync()
    {
        var suspiciousQueries = await _threatDetector.GetSuspiciousQueriesAsync();
        
        foreach (var query in suspiciousQueries)
        {
            if (ContainsSQLInjection(query.Query))
            {
                var threat = new SecurityThreat
                {
                    Type = ThreatType.SQLInjection,
                    Source = query.IPAddress,
                    Target = query.Database,
                    Severity = ThreatSeverity.Critical,
                    Timestamp = DateTime.UtcNow,
                    Details = $"SQL injection attempt: {query.Query}"
                };
                
                await _alertService.RaiseAlertAsync(threat);
                await _threatDetector.BlockIPAsync(query.IPAddress, TimeSpan.FromHours(1));
            }
        }
    }
    
    private async Task DetectXSSAttacksAsync()
    {
        var suspiciousInputs = await _threatDetector.GetSuspiciousInputsAsync();
        
        foreach (var input in suspiciousInputs)
        {
            if (ContainsXSS(input.Value))
            {
                var threat = new SecurityThreat
                {
                    Type = ThreatType.XSS,
                    Source = input.IPAddress,
                    Target = input.Endpoint,
                    Severity = ThreatSeverity.High,
                    Timestamp = DateTime.UtcNow,
                    Details = $"XSS attempt: {input.Value}"
                };
                
                await _alertService.RaiseAlertAsync(threat);
                await _threatDetector.BlockIPAsync(input.IPAddress, TimeSpan.FromMinutes(15));
            }
        }
    }
    
    private async Task DetectPrivilegeEscalationAsync()
    {
        var privilegeChanges = await _threatDetector.GetPrivilegeChangesAsync();
        
        foreach (var change in privilegeChanges)
        {
            if (IsSuspiciousPrivilegeChange(change))
            {
                var threat = new SecurityThreat
                {
                    Type = ThreatType.PrivilegeEscalation,
                    Source = change.User,
                    Target = change.Resource,
                    Severity = ThreatSeverity.Critical,
                    Timestamp = DateTime.UtcNow,
                    Details = $"Suspicious privilege change: {change.OldRole} -> {change.NewRole}"
                };
                
                await _alertService.RaiseAlertAsync(threat);
                await _threatDetector.LockAccountAsync(change.User);
            }
        }
    }
    
    private async Task DetectDataExfiltrationAsync()
    {
        var dataAccess = await _threatDetector.GetDataAccessAsync();
        
        foreach (var access in dataAccess)
        {
            if (IsSuspiciousDataAccess(access))
            {
                var threat = new SecurityThreat
                {
                    Type = ThreatType.DataExfiltration,
                    Source = access.User,
                    Target = access.DataType,
                    Severity = ThreatSeverity.Critical,
                    Timestamp = DateTime.UtcNow,
                    Details = $"Suspicious data access: {access.DataType} - {access.Amount} records"
                };
                
                await _alertService.RaiseAlertAsync(threat);
                await _threatDetector.QuarantineDataAsync(access.DataType);
            }
        }
    }
    
    private async Task CheckForAnomaliesAsync()
    {
        // Check for unusual access patterns
        var accessPatterns = await _threatDetector.GetAccessPatternsAsync();
        
        foreach (var pattern in accessPatterns)
        {
            if (IsAnomalousPattern(pattern))
            {
                var threat = new SecurityThreat
                {
                    Type = ThreatType.Anomaly,
                    Source = pattern.User,
                    Target = pattern.Resource,
                    Severity = ThreatSeverity.Medium,
                    Timestamp = DateTime.UtcNow,
                    Details = $"Anomalous access pattern: {pattern.Description}"
                };
                
                await _alertService.RaiseAlertAsync(threat);
            }
        }
    }
    
    private async Task UpdateThreatIntelligenceAsync()
    {
        // Update threat intelligence feeds
        await _threatDetector.UpdateThreatFeedsAsync();
        
        // Update known malicious IPs
        await _threatDetector.UpdateMaliciousIPsAsync();
        
        // Update known attack patterns
        await _threatDetector.UpdateAttackPatternsAsync();
    }
    
    private bool ContainsSQLInjection(string query)
    {
        var sqlPatterns = new[]
        {
            @"(\b(SELECT|INSERT|UPDATE|DELETE|DROP|CREATE|ALTER|EXEC|EXECUTE)\b)",
            @"(\b(UNION|OR|AND)\b.*\b(SELECT|INSERT|UPDATE|DELETE)\b)",
            @"(--|#|\/\|\\/)",
            @"(\b(WAITFOR|DELAY)\b)",
            @"(\b(CHAR|ASCII|SUBSTRING|LEN)\b)"
        };
        
        return sqlPatterns.Any(pattern => Regex.IsMatch(query, pattern, RegexOptions.IgnoreCase));
    }
    
    private bool ContainsXSS(string input)
    {
        var xssPatterns = new[]
        {
            @"<script[^>]>.?</script>",
            @"javascript:",
            @"on\w+\s*=",
            @"<iframe[^>]*>",
            @"<object[^>]*>",
            @"<embed[^>]*>"
        };
        
        return xssPatterns.Any(pattern => Regex.IsMatch(input, pattern, RegexOptions.IgnoreCase));
    }
    
    private bool IsSuspiciousPrivilegeChange(PrivilegeChange change)
    {
        // Check for suspicious privilege escalation patterns
        var suspiciousPatterns = new[]
        {
            new { Old = "user", New = "admin" },
            new { Old = "viewer", New = "admin" },
            new { Old = "guest", New = "admin" }
        };
        
        return suspiciousPatterns.Any(p => 
            change.OldRole.ToLower().Contains(p.Old) && 
            change.NewRole.ToLower().Contains(p.New));
    }
    
    private bool IsSuspiciousDataAccess(DataAccess access)
    {
        // Check for suspicious data access patterns
        return access.Amount > 1000 || // Large data access
               access.TimeOfDay.Hour < 6 || access.TimeOfDay.Hour > 22 || // Unusual hours
               access.DataType == "pii" && access.Amount > 100; // Large PII access
    }
    
    private bool IsAnomalousPattern(AccessPattern pattern)
    {
        // Check for anomalous access patterns
        return pattern.Frequency > 100 || // High frequency
               pattern.GeographicDistance > 1000 || // Large geographic distance
               pattern.TimeSpan.TotalHours < 1; // Very short time span
    }
}
public class SecurityThreat
{
    public ThreatType Type { get; set; }
    public string Source { get; set; } = string.Empty;
    public string Target { get; set; } = string.Empty;
    public ThreatSeverity Severity { get; set; }
    public DateTime Timestamp { get; set; }
    public string Details { get; set; } = string.Empty;
}
public enum ThreatType
{
    BruteForce,
    SQLInjection,
    XSS,
    PrivilegeEscalation,
    DataExfiltration,
    Anomaly
}
public enum ThreatSeverity
{
    Low,
    Medium,
    High,
    Critical
}
public class PrivilegeChange
{
    public string User { get; set; } = string.Empty;
    public string Resource { get; set; } = string.Empty;
    public string OldRole { get; set; } = string.Empty;
    public string NewRole { get; set; } = string.Empty;
    public DateTime Timestamp { get; set; }
}
public class DataAccess
{
    public string User { get; set; } = string.Empty;
    public string DataType { get; set; } = string.Empty;
    public int Amount { get; set; }
    public DateTime TimeOfDay { get; set; }
}
public class AccessPattern
{
    public string User { get; set; } = string.Empty;
    public string Resource { get; set; } = string.Empty;
    public int Frequency { get; set; }
    public double GeographicDistance { get; set; }
    public TimeSpan TimeSpan { get; set; }
    public string Description { get; set; } = string.Empty;
}

🔐 Compliance and Governance

Compliance Management Service

// ComplianceManagementService.cs
using TuskLang;
using TuskLang.Security;
public class ComplianceManagementService
{
    private readonly TuskLang _parser;
    private readonly IComplianceChecker _complianceChecker;
    private readonly IAuditLogger _auditLogger;
    private readonly ILogger<ComplianceManagementService> _logger;
    
    public ComplianceManagementService(
        IComplianceChecker complianceChecker,
        IAuditLogger auditLogger,
        ILogger<ComplianceManagementService> logger)
    {
        _parser = new TuskLang();
        _complianceChecker = complianceChecker;
        _auditLogger = auditLogger;
        _logger = logger;
    }
    
    public async Task<ComplianceReport> GenerateComplianceReportAsync(string filePath)
    {
        var report = new ComplianceReport
        {
            FilePath = filePath,
            GeneratedAt = DateTime.UtcNow
        };
        
        try
        {
            // Parse configuration
            var config = _parser.ParseFile(filePath);
            
            // Check GDPR compliance
            report.GDPR = await CheckGDPRComplianceAsync(config);
            
            // Check HIPAA compliance
            report.HIPAA = await CheckHIPAAComplianceAsync(config);
            
            // Check PCI DSS compliance
            report.PCIDSS = await CheckPCIDSSComplianceAsync(config);
            
            // Check SOX compliance
            report.SOX = await CheckSOXComplianceAsync(config);
            
            // Generate overall compliance score
            report.OverallScore = CalculateOverallScore(report);
            
            // Log compliance check
            await _auditLogger.LogComplianceCheckAsync(report);
            
            _logger.LogInformation("Compliance report generated with score: {Score}", report.OverallScore);
            
            return report;
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Failed to generate compliance report");
            throw;
        }
    }
    
    private async Task<ComplianceResult> CheckGDPRComplianceAsync(Dictionary<string, object> config)
    {
        var result = new ComplianceResult
        {
            Standard = "GDPR",
            CheckedAt = DateTime.UtcNow
        };
        
        var checks = new List<ComplianceCheck>();
        
        // Check data minimization
        checks.Add(new ComplianceCheck
        {
            Name = "Data Minimization",
            Description = "Only necessary data is collected and processed",
            Status = await _complianceChecker.CheckDataMinimizationAsync(config),
            Required = true
        });
        
        // Check consent management
        checks.Add(new ComplianceCheck
        {
            Name = "Consent Management",
            Description = "Proper consent is obtained and managed",
            Status = await _complianceChecker.CheckConsentManagementAsync(config),
            Required = true
        });
        
        // Check data subject rights
        checks.Add(new ComplianceCheck
        {
            Name = "Data Subject Rights",
            Description = "Data subject rights are properly implemented",
            Status = await _complianceChecker.CheckDataSubjectRightsAsync(config),
            Required = true
        });
        
        // Check data protection
        checks.Add(new ComplianceCheck
        {
            Name = "Data Protection",
            Description = "Data is properly protected and encrypted",
            Status = await _complianceChecker.CheckDataProtectionAsync(config),
            Required = true
        });
        
        // Check breach notification
        checks.Add(new ComplianceCheck
        {
            Name = "Breach Notification",
            Description = "Breach notification procedures are in place",
            Status = await _complianceChecker.CheckBreachNotificationAsync(config),
            Required = true
        });
        
        result.Checks = checks;
        result.Compliant = checks.All(c => c.Status == ComplianceStatus.Pass);
        result.Score = CalculateComplianceScore(checks);
        
        return result;
    }
    
    private async Task<ComplianceResult> CheckHIPAAComplianceAsync(Dictionary<string, object> config)
    {
        var result = new ComplianceResult
        {
            Standard = "HIPAA",
            CheckedAt = DateTime.UtcNow
        };
        
        var checks = new List<ComplianceCheck>();
        
        // Check administrative safeguards
        checks.Add(new ComplianceCheck
        {
            Name = "Administrative Safeguards",
            Description = "Administrative safeguards are properly implemented",
            Status = await _complianceChecker.CheckAdministrativeSafeguardsAsync(config),
            Required = true
        });
        
        // Check physical safeguards
        checks.Add(new ComplianceCheck
        {
            Name = "Physical Safeguards",
            Description = "Physical safeguards are properly implemented",
            Status = await _complianceChecker.CheckPhysicalSafeguardsAsync(config),
            Required = true
        });
        
        // Check technical safeguards
        checks.Add(new ComplianceCheck
        {
            Name = "Technical Safeguards",
            Description = "Technical safeguards are properly implemented",
            Status = await _complianceChecker.CheckTechnicalSafeguardsAsync(config),
            Required = true
        });
        
        result.Checks = checks;
        result.Compliant = checks.All(c => c.Status == ComplianceStatus.Pass);
        result.Score = CalculateComplianceScore(checks);
        
        return result;
    }
    
    private async Task<ComplianceResult> CheckPCIDSSComplianceAsync(Dictionary<string, object> config)
    {
        var result = new ComplianceResult
        {
            Standard = "PCI DSS",
            CheckedAt = DateTime.UtcNow
        };
        
        var checks = new List<ComplianceCheck>();
        
        // Check network security
        checks.Add(new ComplianceCheck
        {
            Name = "Network Security",
            Description = "Network security controls are properly implemented",
            Status = await _complianceChecker.CheckNetworkSecurityAsync(config),
            Required = true
        });
        
        // Check data protection
        checks.Add(new ComplianceCheck
        {
            Name = "Data Protection",
            Description = "Cardholder data is properly protected",
            Status = await _complianceChecker.CheckCardholderDataProtectionAsync(config),
            Required = true
        });
        
        // Check access control
        checks.Add(new ComplianceCheck
        {
            Name = "Access Control",
            Description = "Access to cardholder data is properly controlled",
            Status = await _complianceChecker.CheckAccessControlAsync(config),
            Required = true
        });
        
        result.Checks = checks;
        result.Compliant = checks.All(c => c.Status == ComplianceStatus.Pass);
        result.Score = CalculateComplianceScore(checks);
        
        return result;
    }
    
    private async Task<ComplianceResult> CheckSOXComplianceAsync(Dictionary<string, object> config)
    {
        var result = new ComplianceResult
        {
            Standard = "SOX",
            CheckedAt = DateTime.UtcNow
        };
        
        var checks = new List<ComplianceCheck>();
        
        // Check internal controls
        checks.Add(new ComplianceCheck
        {
            Name = "Internal Controls",
            Description = "Internal controls are properly implemented",
            Status = await _complianceChecker.CheckInternalControlsAsync(config),
            Required = true
        });
        
        // Check financial reporting
        checks.Add(new ComplianceCheck
        {
            Name = "Financial Reporting",
            Description = "Financial reporting controls are properly implemented",
            Status = await _complianceChecker.CheckFinancialReportingAsync(config),
            Required = true
        });
        
        // Check audit trails
        checks.Add(new ComplianceCheck
        {
            Name = "Audit Trails",
            Description = "Audit trails are properly maintained",
            Status = await _complianceChecker.CheckAuditTrailsAsync(config),
            Required = true
        });
        
        result.Checks = checks;
        result.Compliant = checks.All(c => c.Status == ComplianceStatus.Pass);
        result.Score = CalculateComplianceScore(checks);
        
        return result;
    }
    
    private double CalculateComplianceScore(List<ComplianceCheck> checks)
    {
        if (checks.Count == 0) return 0;
        
        var passedChecks = checks.Count(c => c.Status == ComplianceStatus.Pass);
        return (double)passedChecks / checks.Count * 100;
    }
    
    private double CalculateOverallScore(ComplianceReport report)
    {
        var scores = new[]
        {
            report.GDPR?.Score ?? 0,
            report.HIPAA?.Score ?? 0,
            report.PCIDSS?.Score ?? 0,
            report.SOX?.Score ?? 0
        };
        
        return scores.Average();
    }
}
public class ComplianceReport
{
    public string FilePath { get; set; } = string.Empty;
    public DateTime GeneratedAt { get; set; }
    public ComplianceResult? GDPR { get; set; }
    public ComplianceResult? HIPAA { get; set; }
    public ComplianceResult? PCIDSS { get; set; }
    public ComplianceResult? SOX { get; set; }
    public double OverallScore { get; set; }
}
public class ComplianceResult
{
    public string Standard { get; set; } = string.Empty;
    public DateTime CheckedAt { get; set; }
    public List<ComplianceCheck> Checks { get; set; } = new List<ComplianceCheck>();
    public bool Compliant { get; set; }
    public double Score { get; set; }
}
public class ComplianceCheck
{
    public string Name { get; set; } = string.Empty;
    public string Description { get; set; } = string.Empty;
    public ComplianceStatus Status { get; set; }
    public bool Required { get; set; }
    public string? Details { get; set; }
}
public enum ComplianceStatus
{
    Pass,
    Fail,
    Warning,
    NotApplicable
}

🎯 Security Best Practices

1. Data Protection

- ✅ Encryption at rest - Encrypt all sensitive data - ✅ Encryption in transit - Use TLS for all communications - ✅ Key management - Secure key storage and rotation - ✅ Data classification - Classify and handle data appropriately

2. Access Control

- ✅ Role-based access - Implement RBAC - ✅ Principle of least privilege - Minimal access required - ✅ Multi-factor authentication - Require MFA for sensitive operations - ✅ Session management - Proper session handling

3. Threat Detection

- ✅ Real-time monitoring - Monitor for threats in real-time - ✅ Anomaly detection - Detect unusual patterns - ✅ Intrusion detection - Detect and respond to intrusions - ✅ Incident response - Proper incident response procedures

4. Compliance

- ✅ Regulatory compliance - Meet all applicable regulations - ✅ Audit trails - Maintain comprehensive audit logs - ✅ Data retention - Proper data retention policies - ✅ Privacy protection - Protect user privacy

🎉 You're Ready!

You've mastered TuskLang security! You can now:

- ✅ Implement advanced encryption - Secure data protection - ✅ Detect and prevent threats - Real-time security monitoring - ✅ Ensure compliance - Meet regulatory requirements - ✅ Manage access control - Secure access management - ✅ Protect sensitive data - Comprehensive data protection - ✅ Build secure systems - Enterprise-grade security

🔥 What's Next?

Ready for enterprise solutions? Explore:

1. Enterprise Solutions - Enterprise-grade patterns 2. Deployment Strategies - Production deployment 3. Advanced Architectures - Complex system architectures

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