Altus 4

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Security Model & Architecture ​

Comprehensive Security Architecture Documentation

Altus 4 implements a multi-layered security architecture designed to protect user data, ensure secure API access, and maintain system integrity. This document covers all aspects of the security model from authentication to data encryption.

Security Architecture Overview ​

Defense in Depth Strategy ​

Altus 4 employs a defense-in-depth security strategy with multiple layers of protection:

mermaid
graph TB
    subgraph "External Layer"
        HTTPS[HTTPS/TLS Encryption]
        WAF[Web Application Firewall]
        DDOS[DDoS Protection]
    end

    subgraph "Application Layer"
        AUTH[API Key Authentication]
        AUTHZ[Authorization & Permissions]
        RATE[Rate Limiting]
        VAL[Input Validation]
    end

    subgraph "Service Layer"
        CIRC[Circuit Breakers]
        LOG[Security Logging]
        AUDIT[Audit Trail]
    end

    subgraph "Data Layer"
        ENC[Data Encryption]
        CONN[Secure Connections]
        BACKUP[Encrypted Backups]
    end

    HTTPS --> AUTH
    WAF --> AUTHZ
    DDOS --> RATE
    AUTH --> CIRC
    AUTHZ --> LOG
    RATE --> AUDIT
    VAL --> ENC
    CIRC --> CONN
    LOG --> BACKUP

Security Principles ​

  1. Zero Trust Architecture - Never trust, always verify
  2. Principle of Least Privilege - Minimal necessary permissions
  3. Defense in Depth - Multiple security layers
  4. Fail Secure - Secure defaults and failure modes
  5. Security by Design - Built-in security from the ground up

Authentication System ​

API Key Authentication ​

Altus 4 uses API key-based authentication for B2B service integration, replacing traditional session-based authentication.

API Key Format ​

text
altus4_sk_{environment}_{random_string}

Examples:
- altus4_sk_live_abc123def456ghi789jkl012mno345pqr678
- altus4_sk_test_xyz789abc123def456ghi789jkl012mno345

Key Generation Process ​

typescript
export class ApiKeyService {
  async generateApiKey(environment: 'test' | 'live'): Promise<string> {
    // 1. Generate cryptographically secure random bytes
    const randomBytes = crypto.randomBytes(32);
    const randomString = randomBytes.toString('hex');

    // 2. Create formatted API key
    const apiKey = `altus4_sk_${environment}_${randomString}`;

    // 3. Generate prefix for fast lookup
    const prefix = apiKey.substring(0, 20); // "altus4_sk_live_abc12"

    // 4. Hash full key for secure storage
    const keyHash = crypto.createHash('sha256').update(apiKey).digest('hex');

    // 5. Store only hash and prefix in database
    await this.storeApiKey({
      prefix,
      keyHash,
      environment,
      // ... other metadata
    });

    return apiKey; // Return only once to user
  }
}

Key Validation Process ​

typescript
export class ApiKeyService {
  async validateApiKey(providedKey: string): Promise<ValidationResult | null> {
    try {
      // 1. Validate key format
      if (!providedKey.startsWith('altus4_sk_')) {
        return null;
      }

      // 2. Extract prefix for fast lookup
      const prefix = providedKey.substring(0, 20);

      // 3. Hash provided key
      const providedHash = crypto
        .createHash('sha256')
        .update(providedKey)
        .digest('hex');

      // 4. Look up key by prefix (indexed lookup)
      const storedKey = await this.getKeyByPrefix(prefix);
      if (!storedKey) return null;

      // 5. Constant-time hash comparison
      const isValid = crypto.timingSafeEqual(
        Buffer.from(storedKey.keyHash, 'hex'),
        Buffer.from(providedHash, 'hex')
      );

      if (!isValid) return null;

      // 6. Check key status and expiration
      if (!storedKey.isActive || this.isExpired(storedKey)) {
        return null;
      }

      // 7. Return validation result with user context
      return {
        apiKey: storedKey,
        user: await this.getUserById(storedKey.userId),
      };
    } catch (error) {
      this.logger.error('API key validation error:', error);
      return null;
    }
  }
}

Security Features ​

  1. Secure Generation: Cryptographically secure random number generation
  2. Hash Storage: Only SHA-256 hashes stored, never plaintext keys
  3. Prefix Indexing: Fast lookup without exposing full keys
  4. Timing Attack Protection: Constant-time comparisons
  5. Environment Separation: Test vs live key isolation
  6. Expiration Support: Optional key expiration dates
  7. Usage Tracking: Monitor for suspicious activity

Authentication Middleware ​

typescript
export const authenticateApiKey = async (
  req: ApiKeyAuthenticatedRequest,
  res: Response,
  next: NextFunction
): Promise<void> => {
  try {
    // 1. Extract API key from Authorization header
    const authHeader = req.headers.authorization;
    if (!authHeader?.startsWith('Bearer ')) {
      return res.status(401).json({
        success: false,
        error: { code: 'NO_API_KEY', message: 'Authorization header missing' },
      });
    }

    const apiKey = authHeader.substring(7); // Remove "Bearer "

    // 2. Validate API key
    const validation = await apiKeyService.validateApiKey(apiKey);
    if (!validation) {
      return res.status(401).json({
        success: false,
        error: {
          code: 'INVALID_API_KEY',
          message: 'Invalid or expired API key',
        },
      });
    }

    // 3. Add user context to request
    req.user = validation.user;
    req.apiKey = validation.apiKey;

    // 4. Update usage tracking (async)
    apiKeyService
      .trackUsage(validation.apiKey.id, req.method, req.path)
      .catch(error => logger.warn('Usage tracking failed:', error));

    next();
  } catch (error) {
    logger.error('Authentication middleware error:', error);
    res.status(500).json({
      success: false,
      error: { code: 'AUTH_ERROR', message: 'Authentication failed' },
    });
  }
};

Authorization System ​

Permission-Based Access Control ​

Altus 4 uses a flexible permission-based authorization system:

Permission Model ​

typescript
interface ApiKey {
  id: string;
  userId: string;
  permissions: Permission[];
  rateLimitTier: 'free' | 'pro' | 'enterprise';
  environment: 'test' | 'live';
}

type Permission =
  | 'search' // Execute searches
  | 'analytics' // Access analytics data
  | 'database:read' // View database connections
  | 'database:write' // Manage database connections
  | 'keys:read' // View API keys
  | 'keys:write' // Manage API keys
  | 'admin'; // Administrative access

Permission Enforcement ​

typescript
export const requirePermission = (permission: string) => {
  return (
    req: ApiKeyAuthenticatedRequest,
    res: Response,
    next: NextFunction
  ): void => {
    if (!req.apiKey) {
      return res.status(401).json({
        success: false,
        error: { code: 'UNAUTHORIZED', message: 'Authentication required' },
      });
    }

    // Check if user has required permission
    const hasPermission =
      req.apiKey.permissions.includes(permission) ||
      req.apiKey.permissions.includes('admin');

    if (!hasPermission) {
      return res.status(403).json({
        success: false,
        error: {
          code: 'INSUFFICIENT_PERMISSIONS',
          message: `Permission '${permission}' required`,
          details: {
            required: permission,
            available: req.apiKey.permissions,
          },
        },
      });
    }

    next();
  };
};

Role-Based Access Control ​

typescript
export const requireRole = (role: 'admin' | 'user') => {
  return (
    req: ApiKeyAuthenticatedRequest,
    res: Response,
    next: NextFunction
  ): void => {
    if (!req.user) {
      return res.status(401).json({
        success: false,
        error: { code: 'UNAUTHORIZED', message: 'Authentication required' },
      });
    }

    // Admin role has access to everything
    if (req.user.role === 'admin') {
      return next();
    }

    // Check specific role requirement
    if (req.user.role !== role) {
      return res.status(403).json({
        success: false,
        error: {
          code: 'FORBIDDEN',
          message: `${role} role required`,
          details: { required: role, current: req.user.role },
        },
      });
    }

    next();
  };
};

Resource-Level Authorization ​

typescript
export class DatabaseService {
  async getUserDatabase(
    userId: string,
    databaseId: string
  ): Promise<Database | null> {
    // Ensure user can only access their own databases
    const database = await this.databaseRepository.findOne({
      id: databaseId,
      userId: userId, // Critical: filter by user ID
    });

    if (!database) {
      throw new AppError(
        'Database not found or access denied',
        404,
        'DATABASE_NOT_FOUND'
      );
    }

    return database;
  }
}

Rate Limiting & Abuse Prevention ​

Tiered Rate Limiting ​

Rate limits are enforced based on API key tiers:

typescript
interface RateLimitTier {
  name: 'free' | 'pro' | 'enterprise';
  requestsPerHour: number;
  requestsPerMinute: number;
  burstLimit: number;
  blockDuration: number; // seconds
}

const RATE_LIMIT_TIERS: Record<string, RateLimitTier> = {
  free: {
    name: 'free',
    requestsPerHour: 1000,
    requestsPerMinute: 50,
    burstLimit: 10,
    blockDuration: 300, // 5 minutes
  },
  pro: {
    name: 'pro',
    requestsPerHour: 10000,
    requestsPerMinute: 500,
    burstLimit: 50,
    blockDuration: 60, // 1 minute
  },
  enterprise: {
    name: 'enterprise',
    requestsPerHour: 100000,
    requestsPerMinute: 5000,
    burstLimit: 200,
    blockDuration: 30, // 30 seconds
  },
};

Rate Limiting Implementation ​

typescript
export class RateLimiter {
  private redis: Redis;

  async checkRateLimit(
    apiKeyId: string,
    tier: string
  ): Promise<RateLimitResult> {
    const limits = RATE_LIMIT_TIERS[tier];
    const now = Date.now();
    const hourWindow = Math.floor(now / (60 * 60 * 1000));
    const minuteWindow = Math.floor(now / (60 * 1000));

    // Use Redis pipeline for atomic operations
    const pipeline = this.redis.pipeline();

    // Check hourly limit
    const hourKey = `rate_limit:${apiKeyId}:hour:${hourWindow}`;
    pipeline.incr(hourKey);
    pipeline.expire(hourKey, 3600);

    // Check minute limit
    const minuteKey = `rate_limit:${apiKeyId}:minute:${minuteWindow}`;
    pipeline.incr(minuteKey);
    pipeline.expire(minuteKey, 60);

    const results = await pipeline.exec();
    const hourlyCount = results[0][1] as number;
    const minuteCount = results[2][1] as number;

    // Check limits
    if (hourlyCount > limits.requestsPerHour) {
      return {
        allowed: false,
        reason: 'hourly_limit_exceeded',
        resetTime: new Date((hourWindow + 1) * 60 * 60 * 1000),
        remaining: 0,
      };
    }

    if (minuteCount > limits.requestsPerMinute) {
      return {
        allowed: false,
        reason: 'minute_limit_exceeded',
        resetTime: new Date((minuteWindow + 1) * 60 * 1000),
        remaining: 0,
      };
    }

    return {
      allowed: true,
      remaining: Math.min(
        limits.requestsPerHour - hourlyCount,
        limits.requestsPerMinute - minuteCount
      ),
    };
  }
}

Abuse Detection ​

typescript
export class AbuseDetector {
  async detectSuspiciousActivity(
    apiKeyId: string,
    request: Request
  ): Promise<boolean> {
    const suspicious = await Promise.all([
      this.checkRapidFireRequests(apiKeyId),
      this.checkUnusualQueryPatterns(request.body?.query),
      this.checkIPReputation(request.ip),
      this.checkUserAgentAnomalies(request.headers['user-agent']),
    ]);

    return suspicious.some(Boolean);
  }

  private async checkRapidFireRequests(apiKeyId: string): Promise<boolean> {
    const key = `abuse:rapid_fire:${apiKeyId}`;
    const count = await this.redis.incr(key);
    await this.redis.expire(key, 10); // 10 second window

    return count > 50; // More than 50 requests in 10 seconds
  }

  private async checkUnusualQueryPatterns(query?: string): Promise<boolean> {
    if (!query) return false;

    // Check for SQL injection attempts
    const sqlInjectionPatterns = [
      /union\s+select/i,
      /drop\s+table/i,
      /delete\s+from/i,
      /insert\s+into/i,
      /update\s+set/i,
    ];

    return sqlInjectionPatterns.some(pattern => pattern.test(query));
  }
}

Data Protection ​

Encryption at Rest ​

Database Credential Encryption ​

typescript
export class EncryptionService {
  private readonly algorithm = 'aes-256-gcm';
  private readonly keyDerivation = 'pbkdf2';

  async encryptCredentials(
    credentials: DatabaseCredentials
  ): Promise<EncryptedCredentials> {
    // Generate random salt and IV
    const salt = crypto.randomBytes(32);
    const iv = crypto.randomBytes(16);

    // Derive encryption key from master key + salt
    const key = crypto.pbkdf2Sync(
      process.env.ENCRYPTION_KEY!,
      salt,
      100000, // iterations
      32, // key length
      'sha256'
    );

    // Encrypt credentials
    const cipher = crypto.createCipher(this.algorithm, key, iv);
    const encrypted = Buffer.concat([
      cipher.update(JSON.stringify(credentials), 'utf8'),
      cipher.final(),
    ]);

    const authTag = cipher.getAuthTag();

    return {
      encryptedData: encrypted.toString('base64'),
      salt: salt.toString('base64'),
      iv: iv.toString('base64'),
      authTag: authTag.toString('base64'),
      algorithm: this.algorithm,
    };
  }

  async decryptCredentials(
    encrypted: EncryptedCredentials
  ): Promise<DatabaseCredentials> {
    // Reconstruct encryption key
    const salt = Buffer.from(encrypted.salt, 'base64');
    const key = crypto.pbkdf2Sync(
      process.env.ENCRYPTION_KEY!,
      salt,
      100000,
      32,
      'sha256'
    );

    // Decrypt credentials
    const iv = Buffer.from(encrypted.iv, 'base64');
    const authTag = Buffer.from(encrypted.authTag, 'base64');
    const encryptedData = Buffer.from(encrypted.encryptedData, 'base64');

    const decipher = crypto.createDecipher(encrypted.algorithm, key, iv);
    decipher.setAuthTag(authTag);

    const decrypted = Buffer.concat([
      decipher.update(encryptedData),
      decipher.final(),
    ]);

    return JSON.parse(decrypted.toString('utf8'));
  }
}

Sensitive Data Handling ​

typescript
export class UserService {
  async createUser(userData: CreateUserRequest): Promise<User> {
    // Hash password with bcrypt
    const saltRounds = 12;
    const passwordHash = await bcrypt.hash(userData.password, saltRounds);

    // Never store plaintext passwords
    const user = await this.userRepository.create({
      ...userData,
      password: passwordHash, // Store only hash
      // Remove plaintext password from memory
      plainPassword: undefined,
    });

    // Remove sensitive data from response
    const { password, ...safeUser } = user;
    return safeUser as User;
  }

  async authenticateUser(email: string, password: string): Promise<AuthResult> {
    const user = await this.userRepository.findByEmail(email);
    if (!user) {
      // Prevent timing attacks - always hash even if user not found
      await bcrypt.hash(password, 12);
      throw new AppError('Invalid credentials', 401, 'INVALID_CREDENTIALS');
    }

    const isValid = await bcrypt.compare(password, user.password);
    if (!isValid) {
      throw new AppError('Invalid credentials', 401, 'INVALID_CREDENTIALS');
    }

    return { user: this.sanitizeUser(user) };
  }
}

Encryption in Transit ​

HTTPS/TLS Configuration ​

typescript
// Production HTTPS configuration
const httpsOptions = {
  key: fs.readFileSync('/path/to/private-key.pem'),
  cert: fs.readFileSync('/path/to/certificate.pem'),
  ca: fs.readFileSync('/path/to/ca-certificate.pem'),

  // Security settings
  secureProtocol: 'TLSv1_2_method',
  ciphers: [
    'ECDHE-RSA-AES128-GCM-SHA256',
    'ECDHE-RSA-AES256-GCM-SHA384',
    'ECDHE-RSA-AES128-SHA256',
    'ECDHE-RSA-AES256-SHA384',
  ].join(':'),
  honorCipherOrder: true,
};

const server = https.createServer(httpsOptions, app);

Database Connection Security ​

typescript
// Secure MySQL connection configuration
const secureConnectionConfig = {
  host: process.env.DB_HOST,
  user: process.env.DB_USERNAME,
  password: process.env.DB_PASSWORD,
  database: process.env.DB_DATABASE,

  // SSL/TLS configuration
  ssl: {
    ca: fs.readFileSync('/path/to/ca-cert.pem'),
    key: fs.readFileSync('/path/to/client-key.pem'),
    cert: fs.readFileSync('/path/to/client-cert.pem'),
    rejectUnauthorized: true,
    verifyServerCertificate: true,
  },

  // Connection security
  connectTimeout: 60000,
  acquireTimeout: 60000,
  timeout: 60000,
};

Input Validation & Sanitization ​

Request Validation ​

typescript
// Comprehensive input validation with Zod
const searchRequestSchema = z.object({
  query: z
    .string()
    .min(1, 'Query cannot be empty')
    .max(1000, 'Query too long')
    .refine(query => {
      // Prevent SQL injection patterns
      const dangerousPatterns = [
        /union\s+select/i,
        /drop\s+table/i,
        /delete\s+from/i,
        /insert\s+into/i,
      ];
      return !dangerousPatterns.some(pattern => pattern.test(query));
    }, 'Query contains potentially dangerous patterns'),

  databases: z.array(z.string().uuid()).max(10, 'Too many databases selected'),

  searchMode: z.enum(['natural', 'boolean', 'semantic']).default('natural'),

  limit: z
    .number()
    .min(1, 'Limit must be at least 1')
    .max(100, 'Limit cannot exceed 100')
    .default(20),

  offset: z.number().min(0, 'Offset cannot be negative').default(0),
});

SQL Injection Prevention ​

typescript
export class DatabaseService {
  async executeFullTextSearch(
    databaseId: string,
    query: string,
    tables: string[],
    limit: number,
    offset: number
  ): Promise<SearchResult[]> {
    // Always use parameterized queries
    const sanitizedTables = tables
      .filter(table => /^[a-zA-Z_][a-zA-Z0-9_]*$/.test(table)) // Validate table names
      .map(table => mysql.escapeId(table)); // Escape identifiers

    if (sanitizedTables.length === 0) {
      throw new AppError('No valid tables specified', 400, 'INVALID_TABLES');
    }

    // Build safe query with parameterized values
    const searchQueries = sanitizedTables.map(
      table => `
      SELECT *, '${table}' as source_table,
             MATCH(title, content) AGAINST(? IN NATURAL LANGUAGE MODE) as relevance
      FROM ${table}
      WHERE MATCH(title, content) AGAINST(? IN NATURAL LANGUAGE MODE)
    `
    );

    const unionQuery = `
      (${searchQueries.join(') UNION ALL (')})
      ORDER BY relevance DESC
      LIMIT ? OFFSET ?
    `;

    // Execute with parameterized values
    const params = [
      ...searchQueries.flatMap(() => [query, query]), // Two params per query
      limit,
      offset,
    ];

    const [results] = await this.executeQuery(databaseId, unionQuery, params);
    return results as SearchResult[];
  }
}

XSS Prevention ​

typescript
export class ResponseSanitizer {
  static sanitizeSearchResults(results: SearchResult[]): SearchResult[] {
    return results.map(result => ({
      ...result,
      // Sanitize text fields that might be displayed in UI
      title: this.sanitizeHtml(result.title),
      snippet: this.sanitizeHtml(result.snippet),
      data: this.sanitizeObject(result.data),
    }));
  }

  private static sanitizeHtml(text: string): string {
    if (!text) return text;

    return text
      .replace(/</g, '&lt;')
      .replace(/>/g, '&gt;')
      .replace(/"/g, '&quot;')
      .replace(/'/g, '&#x27;')
      .replace(/\//g, '&#x2F;');
  }

  private static sanitizeObject(obj: any): any {
    if (typeof obj === 'string') {
      return this.sanitizeHtml(obj);
    } else if (Array.isArray(obj)) {
      return obj.map(item => this.sanitizeObject(item));
    } else if (obj && typeof obj === 'object') {
      const sanitized: any = {};
      for (const [key, value] of Object.entries(obj)) {
        sanitized[key] = this.sanitizeObject(value);
      }
      return sanitized;
    }
    return obj;
  }
}

Security Monitoring & Logging ​

Security Event Logging ​

typescript
export class SecurityLogger {
  private logger: Logger;

  constructor() {
    this.logger = winston.createLogger({
      level: 'info',
      format: winston.format.combine(
        winston.format.timestamp(),
        winston.format.errors({ stack: true }),
        winston.format.json()
      ),
      defaultMeta: { service: 'altus4-security' },
      transports: [
        new winston.transports.File({
          filename: 'logs/security.log',
          level: 'warn', // Only log security events
        }),
        new winston.transports.Console({
          format: winston.format.simple(),
        }),
      ],
    });
  }

  logAuthenticationAttempt(
    result: 'success' | 'failure',
    details: {
      apiKey?: string;
      ip: string;
      userAgent: string;
      endpoint: string;
    }
  ): void {
    this.logger.warn('Authentication attempt', {
      event: 'auth_attempt',
      result,
      ip: details.ip,
      userAgent: details.userAgent,
      endpoint: details.endpoint,
      apiKeyPrefix: details.apiKey?.substring(0, 20),
      timestamp: new Date().toISOString(),
    });
  }

  logSuspiciousActivity(type: string, details: any): void {
    this.logger.error('Suspicious activity detected', {
      event: 'suspicious_activity',
      type,
      details,
      timestamp: new Date().toISOString(),
    });
  }

  logRateLimitExceeded(apiKeyId: string, ip: string, tier: string): void {
    this.logger.warn('Rate limit exceeded', {
      event: 'rate_limit_exceeded',
      apiKeyId,
      ip,
      tier,
      timestamp: new Date().toISOString(),
    });
  }
}

Audit Trail ​

typescript
export class AuditLogger {
  async logDatabaseAccess(
    userId: string,
    databaseId: string,
    action: string
  ): Promise<void> {
    await this.auditRepository.create({
      userId,
      resourceType: 'database',
      resourceId: databaseId,
      action,
      timestamp: new Date(),
      ip: this.getCurrentIP(),
      userAgent: this.getCurrentUserAgent(),
    });
  }

  async logApiKeyOperation(
    userId: string,
    keyId: string,
    operation: string
  ): Promise<void> {
    await this.auditRepository.create({
      userId,
      resourceType: 'api_key',
      resourceId: keyId,
      action: operation,
      timestamp: new Date(),
      ip: this.getCurrentIP(),
      userAgent: this.getCurrentUserAgent(),
    });
  }
}

Security Headers & Middleware ​

Security Headers ​

typescript
// Helmet.js security headers configuration
app.use(
  helmet({
    contentSecurityPolicy: {
      directives: {
        defaultSrc: ["'self'"],
        styleSrc: ["'self'", "'unsafe-inline'"],
        scriptSrc: ["'self'"],
        imgSrc: ["'self'", 'data:', 'https:'],
        connectSrc: ["'self'"],
        fontSrc: ["'self'"],
        objectSrc: ["'none'"],
        mediaSrc: ["'self'"],
        frameSrc: ["'none'"],
      },
    },
    crossOriginEmbedderPolicy: false,
    hsts: {
      maxAge: 31536000,
      includeSubDomains: true,
      preload: true,
    },
  })
);

// Additional security headers
app.use((req, res, next) => {
  res.setHeader('X-API-Version', '1.0');
  res.setHeader('X-Rate-Limit-Policy', 'tiered');
  res.setHeader(
    'Strict-Transport-Security',
    'max-age=31536000; includeSubDomains'
  );
  next();
});

CORS Configuration ​

typescript
// Secure CORS configuration
app.use(
  cors({
    origin: (origin, callback) => {
      // Allow requests with no origin (mobile apps, etc.)
      if (!origin) return callback(null, true);

      // Check against allowed origins
      const allowedOrigins = process.env.ALLOWED_ORIGINS?.split(',') || [];
      if (allowedOrigins.includes(origin)) {
        return callback(null, true);
      }

      callback(new Error('Not allowed by CORS'));
    },
    credentials: true,
    methods: ['GET', 'POST', 'PUT', 'DELETE', 'OPTIONS'],
    allowedHeaders: ['Content-Type', 'Authorization', 'X-Requested-With'],
    exposedHeaders: [
      'X-RateLimit-Limit',
      'X-RateLimit-Remaining',
      'X-RateLimit-Reset',
    ],
  })
);

Incident Response ​

Security Incident Detection ​

typescript
export class IncidentDetector {
  async detectSecurityIncident(
    events: SecurityEvent[]
  ): Promise<SecurityIncident | null> {
    // Multiple failed authentication attempts
    const failedAuths = events.filter(
      e =>
        e.type === 'auth_failure' &&
        e.timestamp > new Date(Date.now() - 5 * 60 * 1000) // Last 5 minutes
    );

    if (failedAuths.length > 10) {
      return {
        type: 'brute_force_attack',
        severity: 'high',
        description: 'Multiple failed authentication attempts detected',
        affectedResources: failedAuths.map(e => e.ip),
        recommendedActions: ['block_ip', 'notify_admin'],
      };
    }

    // Unusual API usage patterns
    const apiCalls = events.filter(e => e.type === 'api_call');
    if (this.detectAnomalousUsage(apiCalls)) {
      return {
        type: 'anomalous_usage',
        severity: 'medium',
        description: 'Unusual API usage patterns detected',
        recommendedActions: ['monitor', 'rate_limit'],
      };
    }

    return null;
  }
}

Automated Response ​

typescript
export class IncidentResponse {
  async handleSecurityIncident(incident: SecurityIncident): Promise<void> {
    // Log incident
    this.securityLogger.logIncident(incident);

    // Execute automated responses
    for (const action of incident.recommendedActions) {
      switch (action) {
        case 'block_ip':
          await this.blockSuspiciousIPs(incident.affectedResources);
          break;
        case 'rate_limit':
          await this.enforceStrictRateLimit(incident.affectedResources);
          break;
        case 'notify_admin':
          await this.notifyAdministrators(incident);
          break;
        case 'revoke_keys':
          await this.revokeCompromisedKeys(incident.affectedResources);
          break;
      }
    }
  }

  private async blockSuspiciousIPs(ips: string[]): Promise<void> {
    for (const ip of ips) {
      await this.redis.setex(`blocked_ip:${ip}`, 3600, 'security_incident');
    }
  }
}

Security Best Practices ​

Development Security ​

  1. Secure Coding Practices

    • Input validation on all user inputs
    • Parameterized queries for database operations
    • Proper error handling without information disclosure
    • Secure random number generation

  2. Dependency Management

    • Regular security audits with npm audit
    • Automated dependency updates
    • Vulnerability scanning in CI/CD pipeline

  3. Secret Management

    • Environment variables for sensitive configuration
    • No hardcoded secrets in source code
    • Secret rotation procedures

Deployment Security ​

  1. Infrastructure Security

    • Network segmentation and firewalls
    • Regular security patches and updates
    • Intrusion detection systems
    • Encrypted storage and backups

  2. Monitoring and Alerting

    • Real-time security monitoring
    • Automated incident response
    • Regular security assessments
    • Penetration testing

Security is paramount in Altus 4's design, with multiple layers of protection ensuring data integrity, user privacy, and system reliability.