This document outlines the security measures implemented in TaskTracker to address potential vulnerabilities and ensure data integrity.

The following security enhancements have been implemented to address identified issues:

1. HTML Content Sanitization

   • Implemented DOMPurify for comprehensive HTML sanitization
   • Removed all HTML tags from user inputs to prevent XSS attacks
   • Added detection for suspicious content patterns (JavaScript code, event handlers)

2. Task ID Validation

   • Enforced numeric validation for all task IDs
   • Added type conversion and validation for string IDs
   • Improved error handling for invalid ID formats

3. Length Limits

   • Added maximum length constraints for:
     • Task titles (200 characters)
     • Task descriptions (5000 characters)
     • Comments (2000 characters)
   • Automatic truncation of oversized inputs

4. File Path Validation

   • Implemented comprehensive path traversal prevention
   • Added whitelist of allowed file extensions
   • Normalized paths to detect evasion techniques
   • Validated paths before any file operations

5. Command-Line Argument Validation

   • Added strict validation for CLI arguments to prevent injection attacks
   • Implemented contextual validation based on argument type (command, ID, file path, etc.)
   • Added automatic sanitization of potentially dangerous inputs
   • Created early detection and blocking of critical security issues

1. Atomic File Operations

   • Implemented write-to-temp-then-rename pattern for file updates
   • Added file locking during critical operations
   • Created backup system to prevent data loss

2. Data Recovery Mechanisms

   • Added automatic backup creation before file modifications
   • Implemented recovery system for corrupted JSON data
   • Created validation system for configuration integrity

3. Secure File Permissions

   • Set proper file permissions (0600) on data files (Unix systems)
   • Restricted directory permissions to prevent unauthorized access
   • Added directory security checks

1. Robust Error Management

   • Improved error messages with actionable guidance
   • Added graceful degradation for non-critical failures
   • Implemented comprehensive logging of security events

2. JSON Validation

   • Added schema validation for task and configuration data
   • Implemented safe JSON parsing with fallback to defaults
   • Added corruption detection with auto-repair for common issues

When contributing to TaskTracker, please follow these security guidelines:

1. Always sanitize user inputs

   • Use the security.sanitizeInput() function for all user-provided strings
   • Never insert raw user input into the DOM or files
   • Check for dangerous content with security.hasDangerousContent()

2. Validate all file paths

   • Use security.validateFilePath() for all file operations
   • Never allow absolute paths or path traversal via ..
   • Only allow approved file extensions

3. Validate command-line arguments

   • Use cliSecurity.sanitizeArgs() for all command-line arguments
   • Check for validation issues before processing arguments
   • Use type-specific validation with cliSecurity.validateArg()

1. Use atomic operations for data files

   • Use security.safeFileOperation() for all file writes
   • Create backups before modifying critical data
   • Implement proper error handling

2. Validate JSON data

   • Use security.safeJsonParse() for parsing JSON files
   • Provide default values for parsing failures
   • Validate data structure before using

1. Provide detailed error messages

   • Include the specific reason for failures
   • Don't expose sensitive information in errors
   • Always catch and properly handle exceptions

2. Gracefully degrade functionality

   • Fall back to safe defaults when errors occur
   • Log security-related errors
   • Prevent data loss where possible

A comprehensive test suite has been added for security features:

1. Input Sanitization Tests

   • Tests for HTML content removal
   • Tests for length limits enforcement
   • Tests for dangerous content detection

2. File Path Validation Tests

   • Tests for path traversal detection
   • Tests for file extension validation
   • Tests for relative path handling

3. Task ID Validation Tests

   • Tests for numeric ID handling
   • Tests for string ID conversion
   • Tests for invalid ID rejection

4. Safe File Operation Tests

   • Tests for atomic file writing
   • Tests for backup creation
   • Tests for recovery mechanisms

5. CLI Argument Validation Tests

   • Tests for command injection prevention
   • Tests for contextual argument validation
   • Tests for automatic sanitization
   • Tests for critical security issue detection

If you discover a security vulnerability in TaskTracker, please follow these steps:

1. Do not disclose the issue publicly
2. Email details to security@tasktracker.com
3. Include steps to reproduce the vulnerability
4. Allow time for the issue to be addressed before disclosure