Cryptographic Failures in Sails

Cryptographic failures in Sails.js applications typically stem from improper key management, weak encryption algorithms, and flawed authentication mechanisms. The most common patterns include hard-coded secrets, insufficient key rotation, and using outdated cryptographic primitives that modern attackers can easily break.

A classic example is storing API keys or database credentials directly in config files. Consider this vulnerable pattern:

// config/local.js - Vulnerable hard-coded secrets
module.exports = {
  secretKey: 'my-super-secret-key-123', // Hard-coded, weak entropy
  database: {
    password: 'admin123' // Default credentials
  },
  jwtSecret: 'sails-app-secret' // Insufficient length/complexity
};

Another critical failure point is improper session management. Sails uses the skipper module for file uploads, but if file encryption isn't properly configured, sensitive data can be stored in plaintext:

// api/controllers/UploadController.js - Vulnerable file handling
module.exports = {
  upload: async function (req, res) {
    let file = await req.file('avatar');
    
    // No encryption, files stored in plaintext
    await File.create({
      path: file.fd,
      originalName: file.filename,
      owner: req.session.userId
    });
  }
};

Password handling represents another major vulnerability. Many Sails applications still use weak hashing or, worse, store passwords in plaintext:

// api/models/User.js - Vulnerable password storage
module.exports = {
  attributes: {
    username: { type: 'string', required: true },
    password: { type: 'string' } // No hashing, stored in plaintext
  }
};

Even when hashing is implemented, using outdated algorithms like MD5 or SHA-1 creates significant risks. The following demonstrates a common but insecure pattern:

// api/hooks/password.js - Insecure hashing
const crypto = require('crypto');

module.exports = {
  hashPassword: function (password) {
    return crypto.createHash('md5').update(password).digest('hex');
  }
};

This approach is vulnerable to rainbow table attacks and should be replaced with bcrypt or argon2.

Detecting cryptographic failures in Sails applications requires examining both code patterns and runtime configurations. middleBrick's black-box scanning approach can identify several critical issues without requiring source code access.

For configuration file analysis, middleBrick examines exposed configuration endpoints and environment variables. The scanner looks for patterns like:

// Detected vulnerabilities:
- Hard-coded JWT secrets in config files
- Weak password hashing algorithms
- Insecure session storage configurations
- Missing CSRF tokens in API endpoints
- Insecure file upload handling
- Exposed cryptographic keys in error messages

middleBrick's LLM/AI Security module specifically tests for system prompt leakage that might contain cryptographic instructions or API keys. The scanner uses 27 regex patterns to detect various prompt formats that could expose sensitive information.

For runtime detection, middleBrick tests authentication endpoints with common cryptographic weaknesses:

Testing authentication:
1. Weak password policies (less than 8 characters)
2. Missing rate limiting on login attempts
3. Insecure token generation (predictable sequences)
4. Missing secure flag on session cookies
5. Insecure CORS configurations exposing tokens

The scanner also examines API responses for cryptographic information disclosure:

GET /api/users/1
HTTP/1.1 200 OK
{
  "id": 1,
  "username": "admin",
  "password": "5f4dcc3b5aa765d61d8327deb882cf99" // MD5 hash exposed!
}

middleBrick's OpenAPI/Swagger analysis cross-references specification definitions with runtime findings, identifying discrepancies between documented and actual cryptographic implementations.

Securing cryptographic implementations in Sails requires systematic changes across configuration, authentication, and data handling. Start with proper secret management using environment variables:

// config/local.js - Secure secret management
module.exports = {
  jwtSecret: process.env.JWT_SECRET, // Load from secure environment
  database: {
    password: process.env.DB_PASSWORD // Never hard-coded
  },
  session: {
    secret: process.env.SESSION_SECRET, // Strong, random secret
    cookie: {
      secure: true, // HTTPS only
      httpOnly: true, // Prevent XSS access
      maxAge: 24 * 60 * 60 * 1000 // 24 hours
    }
  }
};

For password handling, implement bcrypt with proper salting:

// api/hooks/password.js - Secure password hashing
const bcrypt = require('bcrypt');
const saltRounds = 12; // Sufficient computational cost

module.exports = {
  hashPassword: async function (password) {
    return await bcrypt.hash(password, saltRounds);
  },
  
  comparePassword: async function (password, hash) {
    return await bcrypt.compare(password, hash);
  }
};

Integrate this into your User model:

// api/models/User.js - Secure password storage
const passwordHook = require('../hooks/password');

module.exports = {
  attributes: {
    username: { type: 'string', required: true, unique: true },
    password: { type: 'string' } // Hashed, never plaintext
  },
  
  beforeCreate: async function (values, proceed) {
    if (values.password) {
      values.password = await passwordHook.hashPassword(values.password);
    }
    return proceed();
  },
  
  beforeUpdate: async function (values, proceed) {
    if (values.password) {
      values.password = await passwordHook.hashPassword(values.password);
    }
    return proceed();
  }
};

For JWT implementation, use secure token generation and validation:

// api/services/JWTService.js - Secure JWT handling
const jwt = require('jsonwebtoken');

module.exports = {
  generateToken: function (payload) {
    return jwt.sign(
      payload,
      process.env.JWT_SECRET,
      { expiresIn: '24h' } // Short expiration
    );
  },
  
  verifyToken: function (token) {
    return jwt.verify(token, process.env.JWT_SECRET);
  },
  
  authenticate: async function (req, res, next) {
    try {
      const token = req.headers.authorization?.split(' ')[1];
      if (!token) {
        return res.status(401).json({ error: 'No token provided' });
      }
      
      const decoded = await this.verifyToken(token);
      req.user = decoded;
      next();
    } catch (error) {
      return res.status(401).json({ error: 'Invalid token' });
    }
  }
};

For file encryption, implement proper encryption before storage:

// api/hooks/encryption.js - File encryption
const crypto = require('crypto');

module.exports = {
  encryptFile: function (data, key) {
    const iv = crypto.randomBytes(16);
    const cipher = crypto.createCipheriv(
      'aes-256-gcm',
      key,
      iv
    );
    
    let encrypted = cipher.update(data, 'utf8', 'hex');
    encrypted += cipher.final('hex');
    
    const authTag = cipher.getAuthTag();
    return {
      content: encrypted,
      iv: iv.toString('hex'),
      authTag: authTag.toString('hex')
    };
  },
  
  decryptFile: function (encryptedData, key) {
    const decipher = crypto.createDecipheriv(
      'aes-256-gcm',
      key,
      Buffer.from(encryptedData.iv, 'hex')
    );
    
    decipher.setAuthTag(Buffer.from(encryptedData.authTag, 'hex'));
    
    let decrypted = decipher.update(encryptedData.content, 'hex', 'utf8');
    decrypted += decipher.final('utf8');
    
    return decrypted;
  }
};

Integrate this into your upload controller:

// api/controllers/UploadController.js - Secure file handling
const encryptionHook = require('../hooks/encryption');

module.exports = {
  upload: async function (req, res) {
    let file = await req.file('avatar');
    
    const encryptionKey = process.env.FILE_ENCRYPTION_KEY;
    const encryptedContent = encryptionHook.encryptFile(
      file.contents,
      encryptionKey
    );
    
    await File.create({
      path: file.fd,
      originalName: file.filename,
      encryptedContent: encryptedContent,
      owner: req.session.userId
    });
    
    return res.json({ success: true });
  }
};

Finally, implement proper key rotation and monitoring:

// config/cron.js - Key rotation schedule
module.exports.cron = {
  rotateKeys: {
    schedule: '0 0 * * *', // Daily at midnight
    onTick: async function () {
      // Rotate JWT secrets
      const newSecret = crypto.randomBytes(32).toString('hex');
      await sails.config.models.Config
        .update({ key: 'JWT_SECRET' }, { value: newSecret })
        .fetch();
      
      // Rotate file encryption keys
      const newFileKey = crypto.randomBytes(32).toString('hex');
      await sails.config.models.Config
        .update({ key: 'FILE_ENCRYPTION_KEY' }, { value: newFileKey })
        .fetch();
    }
  }
};