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Security: rhinos0608/PDF-Editor

Security

docs/SECURITY.md

Security Guide

Table of Contents

Security Architecture

Defense in Depth Strategy

┌─────────────────────────────────────────────────────────────┐
│                    Security Layers                           │
├───────────────────────────────────────────────────────────────┤
│  Layer 1: Process Isolation (Sandboxing)                     │
│  Layer 2: Context Isolation (IPC Security)                   │
│  Layer 3: Content Security Policy (CSP)                      │
│  Layer 4: Input Validation & Sanitization                    │
│  Layer 5: Encryption & Cryptography                          │
│  Layer 6: Access Control & Permissions                       │
│  Layer 7: Audit Logging & Monitoring                         │
└───────────────────────────────────────────────────────────────┘

Threat Model

The following table describes the threats that the Professional PDF Editor is exposed to and the mitigation strategies that are in place to address them.

Threat Risk Level Mitigation
Cross-Site Scripting (XSS) High The application uses a strict Content Security Policy (CSP) to prevent XSS attacks. The application also uses a context-aware output encoding system to encode all output.
Code Injection High The application disables Node.js integration in the renderer process to prevent code injection attacks. The application also validates all input to prevent malicious code from being executed.
PDF Malware Medium The application uses a sandboxing mechanism to isolate the PDF rendering process from the rest of the application. The application also validates all PDF files to prevent malicious PDF files from being opened.
Data Exfiltration Medium The application uses encryption to protect sensitive data at rest and in transit. The application also uses a role-based access control (RBAC) system to restrict access to sensitive data.
Man-in-the-Middle (MITM) Attacks Low The application uses HTTPS to encrypt all network communications. The application also uses certificate pinning to prevent MITM attacks.
Supply Chain Attacks Medium The application uses a dependency auditing tool to scan for vulnerable dependencies. The application also uses a lock file to ensure that the same dependencies are used in all environments.
AI Model Poisoning Medium The AI models are trained on a diverse and curated dataset to prevent model poisoning attacks. The AI models are also designed to be resilient to adversarial attacks.
AI Model Evasion Medium The AI models are tested extensively to ensure that they are robust and that they do not produce harmful or unexpected results. The AI models are also designed to be resilient to adversarial attacks.

Electron Security Best Practices

The application should follow these Electron security best practices:

  • Context Isolation: Enable context isolation to prevent renderer processes from accessing Node.js APIs.
  • Node.js Integration: Disable Node.js integration in the renderer process.
  • Sandbox: Enable the sandbox for all renderer processes.
  • Content Security Policy (CSP): Implement a strict CSP to prevent XSS attacks.
  • IPC Communication: Use a secure IPC communication channel between the main and renderer processes.
  • Remote Module: Do not use the deprecated remote module.
  • Protocol Security: Register secure protocol schemes and validate URLs.

PDF Security Features

The application should provide the following PDF security features:

  • PDF Encryption: Encrypt sensitive PDFs with a strong password.
  • Digital Signatures: Add and verify digital signatures.
  • Redaction: Permanently remove sensitive content from PDFs.

AI Security

The Professional PDF Editor uses AI to provide a number of features, such as OCR and document analysis. The security of these AI features is a top priority.

AI Ethics

The AI features in the Professional PDF Editor are designed to be ethical and responsible. The AI models are trained on a diverse dataset to ensure that they are fair and unbiased. The AI models are also designed to be transparent and explainable, so that users can understand how they work.

AI Safety

The AI features in the Professional PDF Editor are designed to be safe and reliable. The AI models are tested extensively to ensure that they are robust and that they do not produce harmful or unexpected results. The AI models are also designed to be resilient to adversarial attacks.

Data Protection

1. Data at Rest

Encrypt sensitive data stored locally.

// Secure storage implementation
import * as crypto from 'crypto';

class SecureStorage {
  private algorithm = 'aes-256-gcm';
  private keyDerivationIterations = 100000;
  
  async encryptData(data: any, password: string): Promise<EncryptedData> {
    // Derive key from password
    const salt = crypto.randomBytes(32);
    const key = crypto.pbkdf2Sync(
      password,
      salt,
      this.keyDerivationIterations,
      32,
      'sha256'
    );
    
    // Encrypt data
    const iv = crypto.randomBytes(16);
    const cipher = crypto.createCipheriv(this.algorithm, key, iv);
    
    const encrypted = Buffer.concat([
      cipher.update(JSON.stringify(data), 'utf8'),
      cipher.final()
    ]);
    
    const authTag = cipher.getAuthTag();
    
    return {
      encrypted: encrypted.toString('base64'),
      salt: salt.toString('base64'),
      iv: iv.toString('base64'),
      authTag: authTag.toString('base64')
    };
  }
  
  async decryptData(
    encryptedData: EncryptedData,
    password: string
  ): Promise<any> {
    // Derive key from password
    const salt = Buffer.from(encryptedData.salt, 'base64');
    const key = crypto.pbkdf2Sync(
      password,
      salt,
      this.keyDerivationIterations,
      32,
      'sha256'
    );
    
    // Decrypt data
    const iv = Buffer.from(encryptedData.iv, 'base64');
    const authTag = Buffer.from(encryptedData.authTag, 'base64');
    const decipher = crypto.createDecipheriv(this.algorithm, key, iv);
    decipher.setAuthTag(authTag);
    
    const decrypted = Buffer.concat([
      decipher.update(Buffer.from(encryptedData.encrypted, 'base64')),
      decipher.final()
    ]);
    
    return JSON.parse(decrypted.toString('utf8'));
  }
}

2. Data in Transit

Use HTTPS for all network communications.

// Secure API client
class SecureAPIClient {
  private baseURL: string;
  private certificatePinning: boolean;
  
  constructor(baseURL: string, options?: APIClientOptions) {
    this.baseURL = baseURL;
    this.certificatePinning = options?.certificatePinning ?? true;
  }
  
  async request(endpoint: string, options: RequestOptions): Promise<any> {
    const url = new URL(endpoint, this.baseURL);
    
    // Enforce HTTPS
    if (url.protocol !== 'https:') {
      throw new Error('HTTPS required for API requests');
    }
    
    // Configure secure request
    const requestOptions: https.RequestOptions = {
      method: options.method || 'GET',
      headers: {
        ...options.headers,
        'X-Request-ID': this.generateRequestId(),
        'X-Client-Version': app.getVersion()
      },
      // Certificate pinning
      checkServerIdentity: this.certificatePinning 
        ? this.verifyServerCertificate.bind(this)
        : undefined,
      // Timeouts
      timeout: options.timeout || 30000
    };
    
    return new Promise((resolve, reject) => {
      const req = https.request(url, requestOptions, (res) => {
        // Handle response
        let data = '';
        res.on('data', chunk => data += chunk);
        res.on('end', () => {
          if (res.statusCode >= 200 && res.statusCode < 300) {
            resolve(JSON.parse(data));
          } else {
            reject(new Error(`HTTP ${res.statusCode}: ${data}`));
          }
        });
      });
      
      req.on('error', reject);
      req.on('timeout', () => reject(new Error('Request timeout')));
      
      if (options.body) {
        req.write(JSON.stringify(options.body));
      }
      
      req.end();
    });
  }
  
  private verifyServerCertificate(
    hostname: string,
    cert: PeerCertificate
  ): Error | undefined {
    // Implement certificate pinning
    const expectedFingerprint = this.getExpectedFingerprint(hostname);
    if (cert.fingerprint !== expectedFingerprint) {
      return new Error('Certificate verification failed');
    }
    return undefined;
  }
}

3. Memory Protection

Clear sensitive data from memory.

// Secure memory handling
class SecureMemory {
  // Use WeakMap to allow garbage collection
  private sensitiveData = new WeakMap<object, any>();
  
  store(key: object, value: any): void {
    // Store sensitive data
    this.sensitiveData.set(key, value);
  }
  
  retrieve(key: object): any {
    return this.sensitiveData.get(key);
  }
  
  clear(key: object): void {
    // Clear from memory
    const data = this.sensitiveData.get(key);
    if (data) {
      // Overwrite memory if it's a buffer
      if (Buffer.isBuffer(data)) {
        data.fill(0);
      } else if (typeof data === 'string') {
        // Strings are immutable, best we can do is remove reference
        this.sensitiveData.delete(key);
      } else if (typeof data === 'object') {
        // Clear object properties
        Object.keys(data).forEach(prop => {
          data[prop] = null;
        });
        this.sensitiveData.delete(key);
      }
    }
  }
  
  clearAll(): void {
    // Note: WeakMap doesn't provide iteration
    // References will be garbage collected
    this.sensitiveData = new WeakMap();
    
    // Force garbage collection if available
    if (global.gc) {
      global.gc();
    }
  }
}

Authentication & Authorization

1. User Authentication

// Authentication service
class AuthenticationService {
  private sessionTimeout = 30 * 60 * 1000; // 30 minutes
  private maxLoginAttempts = 5;
  private lockoutDuration = 15 * 60 * 1000; // 15 minutes
  
  async authenticate(
    username: string,
    password: string
  ): Promise<AuthResult> {
    try {
      // Check lockout
      if (this.isLockedOut(username)) {
        throw new Error('Account temporarily locked');
      }
      
      // Validate credentials
      const user = await this.validateCredentials(username, password);
      
      if (!user) {
        this.recordFailedAttempt(username);
        throw new Error('Invalid credentials');
      }
      
      // Generate session token
      const token = this.generateSecureToken();
      const session = {
        userId: user.id,
        token,
        createdAt: Date.now(),
        expiresAt: Date.now() + this.sessionTimeout
      };
      
      // Store session securely
      await this.storeSession(session);
      
      // Clear failed attempts
      this.clearFailedAttempts(username);
      
      return {
        success: true,
        user,
        token
      };
    } catch (error) {
      logger.error('Authentication failed', error);
      return {
        success: false,
        error: error.message
      };
    }
  }
  
  private generateSecureToken(): string {
    return crypto.randomBytes(32).toString('base64url');
  }
  
  private async validateCredentials(
    username: string,
    password: string
  ): Promise<User | null> {
    // Hash password with salt
    const user = await this.getUserByUsername(username);
    if (!user) return null;
    
    const passwordHash = crypto.pbkdf2Sync(
      password,
      user.salt,
      100000,
      64,
      'sha512'
    ).toString('hex');
    
    return passwordHash === user.passwordHash ? user : null;
  }
}

2. Role-Based Access Control (RBAC)

// RBAC implementation
class AuthorizationService {
  private permissions = new Map<string, Set<string>>([
    ['admin', new Set(['read', 'write', 'delete', 'admin'])],
    ['editor', new Set(['read', 'write'])],
    ['viewer', new Set(['read'])],
    ['guest', new Set([])]
  ]);
  
  hasPermission(
    user: User,
    resource: string,
    action: string
  ): boolean {
    // Check user role permissions
    const userPermissions = this.permissions.get(user.role);
    if (!userPermissions) return false;
    
    // Check specific permission
    const permission = `${resource}:${action}`;
    if (userPermissions.has(permission)) return true;
    
    // Check wildcard permissions
    if (userPermissions.has(`${resource}:*`)) return true;
    if (userPermissions.has(`*:${action}`)) return true;
    if (userPermissions.has('*:*')) return true;
    
    return false;
  }
  
  requirePermission(
    permission: string
  ): (req: Request, res: Response, next: NextFunction) => void {
    return (req, res, next) => {
      const user = req.user;
      if (!user) {
        return res.status(401).json({ error: 'Unauthorized' });
      }
      
      const [resource, action] = permission.split(':');
      if (!this.hasPermission(user, resource, action)) {
        return res.status(403).json({ error: 'Forbidden' });
      }
      
      next();
    };
  }
}

Secure Communication

1. Secure WebSocket Connection

// Secure WebSocket implementation
class SecureWebSocket {
  private ws: WebSocket;
  private encryptionKey: CryptoKey;
  
  async connect(url: string, token: string): Promise<void> {
    // Validate URL
    const wsUrl = new URL(url);
    if (wsUrl.protocol !== 'wss:') {
      throw new Error('Secure WebSocket (wss://) required');
    }
    
    // Generate encryption key for this session
    this.encryptionKey = await crypto.subtle.generateKey(
      { name: 'AES-GCM', length: 256 },
      true,
      ['encrypt', 'decrypt']
    );
    
    // Connect with authentication
    this.ws = new WebSocket(url, {
      headers: {
        'Authorization': `Bearer ${token}`,
        'X-Client-Version': app.getVersion()
      }
    });
    
    this.ws.on('message', this.handleMessage.bind(this));
    this.ws.on('error', this.handleError.bind(this));
  }
  
  async sendSecure(data: any): Promise<void> {
    // Encrypt message
    const encrypted = await this.encryptMessage(data);
    
    // Send encrypted data
    this.ws.send(JSON.stringify({
      type: 'encrypted',
      data: encrypted
    }));
  }
  
  private async encryptMessage(data: any): Promise<EncryptedMessage> {
    const iv = crypto.getRandomValues(new Uint8Array(12));
    const encoded = new TextEncoder().encode(JSON.stringify(data));
    
    const encrypted = await crypto.subtle.encrypt(
      { name: 'AES-GCM', iv },
      this.encryptionKey,
      encoded
    );
    
    return {
      data: Buffer.from(encrypted).toString('base64'),
      iv: Buffer.from(iv).toString('base64')
    };
  }
}

Security Checklist

Development Phase

  • Enable context isolation in all windows
  • Disable Node.js integration in renderers
  • Implement CSP headers
  • Use HTTPS for all external communications
  • Validate and sanitize all inputs
  • Implement secure IPC communication
  • Use environment variables for sensitive config
  • Audit npm dependencies regularly
  • Enable security linting rules
  • Implement proper error handling

Testing Phase

  • Perform security testing
  • Run vulnerability scans
  • Test input validation
  • Verify CSP implementation
  • Test authentication flows
  • Verify encryption implementation
  • Test error handling
  • Perform penetration testing
  • Review security logs
  • Test update mechanism

Deployment Phase

  • Remove development tools
  • Disable debugging features
  • Set production environment variables
  • Enable ASLR (Address Space Layout Randomization)
  • Sign application binaries
  • Implement auto-updates
  • Set up security monitoring
  • Configure logging
  • Prepare incident response plan
  • Document security procedures

Maintenance Phase

  • Monitor security advisories
  • Update dependencies regularly
  • Review security logs
  • Perform regular security audits
  • Update threat model
  • Train development team
  • Review and update security policies
  • Test backup and recovery
  • Conduct security drills
  • Maintain security documentation

Incident Response

Incident Response Plan

  1. Detection & Analysis

    • Monitor security logs
    • Analyze suspicious activity
    • Determine incident severity
    • Document initial findings

  2. Containment

    • Isolate affected systems
    • Preserve evidence
    • Prevent further damage
    • Implement temporary fixes

  3. Eradication

    • Remove malicious code
    • Patch vulnerabilities
    • Update security controls
    • Verify system integrity

  4. Recovery

    • Restore normal operations
    • Monitor for recurrence
    • Validate security measures
    • Document lessons learned

  5. Post-Incident

    • Conduct post-mortem
    • Update security policies
    • Improve detection capabilities
    • Train team on findings

Security Contacts

Role Contact Responsibility
Security Lead security@pdfeditor.com Overall security
Incident Response incident@pdfeditor.com Security incidents
Privacy Officer privacy@pdfeditor.com Data protection
Legal Counsel legal@pdfeditor.com Legal matters

This security guide provides comprehensive security practices for the Professional PDF Editor application. Regular review and updates of these practices are essential to maintain security posture.

There aren’t any published security advisories