Security Architecture =================== This document outlines the security architecture of the AI-Writer platform, including authentication, authorization, data protection, and security best practices. Authentication and Authorization ------------------------------ User Authentication ~~~~~~~~~~~~~~~~~ AI-Writer implements a multi-layered authentication system: 1. **Password-based Authentication** * Passwords are hashed using bcrypt with appropriate work factors * Password complexity requirements are enforced * Account lockout after multiple failed attempts * Password reset via secure email workflow 2. **API Key Authentication** * Unique API keys for programmatic access * Keys are stored using secure hashing * Keys can be scoped to specific permissions * Keys can be revoked at any time 3. **OAuth 2.0 (for multi-user deployments)** * Standard OAuth 2.0 flow with authorization code * JWT tokens with appropriate expiration * Refresh token rotation * PKCE for public clients Authorization Model ~~~~~~~~~~~~~~~~ The platform uses a role-based access control (RBAC) system: 1. **User Roles** * **Admin**: Full system access * **Editor**: Content creation and editing * **Viewer**: Read-only access to content * **API**: Programmatic access with limited scope 2. **Permission Scopes** * `content:read`: View content * `content:write`: Create and edit content * `content:delete`: Delete content * `user:read`: View user information * `user:write`: Modify user information * `settings:read`: View settings * `settings:write`: Modify settings * `api:manage`: Manage API keys 3. **Resource-level Permissions** * Permissions are checked at the resource level * Users can only access their own content * Sharing functionality with explicit permissions Data Protection ------------- Encryption ~~~~~~~~~ 1. **Data in Transit** * TLS 1.3 for all communications * Strong cipher suites * HSTS implementation * Certificate pinning for API clients 2. **Data at Rest** * Database encryption * Encrypted file storage * Secure key management * Regular key rotation 3. **Sensitive Data** * API keys and credentials are encrypted * PII is encrypted with separate keys * Encryption keys are properly secured API Key Security ~~~~~~~~~~~~~~ 1. **Key Generation** * Keys are generated using cryptographically secure random functions * Sufficient entropy (256 bits) * Keys follow a consistent format for validation 2. **Key Storage** * Only key hashes are stored in the database * Secure comparison for validation * Keys are never logged or exposed in error messages 3. **Key Management** * Keys can be rotated regularly * Unused keys are automatically expired * Key usage is logged for audit purposes Secure Development Practices -------------------------- Input Validation ~~~~~~~~~~~~~~ 1. **API Input Validation** * All input is validated against schemas * Type checking and constraint validation * Protection against injection attacks * Input sanitization where appropriate 2. **Content Validation** * Content is scanned for malicious elements * HTML/Markdown sanitization * File upload validation and scanning 3. **Error Handling** * Secure error handling that doesn't leak sensitive information * Consistent error responses * Detailed internal logging for troubleshooting Dependency Management ~~~~~~~~~~~~~~~~~~ 1. **Dependency Scanning** * Regular scanning for vulnerable dependencies * Automated updates for security patches * Dependency pinning for stability 2. **Minimal Dependencies** * Only necessary dependencies are included * Regular dependency audits * Preference for well-maintained libraries 3. **Containerization** * Minimal base images * Non-root container execution * Image scanning for vulnerabilities Logging and Monitoring -------------------- Security Logging ~~~~~~~~~~~~~~ 1. **Authentication Events** * Login attempts (successful and failed) * Password changes and resets * API key creation and usage * Session management events 2. **Authorization Events** * Permission checks * Access denials * Privilege escalation * Role changes 3. **System Events** * Configuration changes * Service starts and stops * Database migrations * Backup and restore operations Monitoring and Alerting ~~~~~~~~~~~~~~~~~~~~~ 1. **Security Monitoring** * Real-time monitoring for suspicious activities * Anomaly detection for unusual patterns * Rate limiting and abuse detection * Geographic anomaly detection 2. **Performance Monitoring** * Resource usage tracking * API response time monitoring * Error rate monitoring * Database performance tracking 3. **Alerting** * Immediate alerts for security incidents * Escalation procedures * On-call rotation * Incident response playbooks Compliance and Privacy -------------------- Data Governance ~~~~~~~~~~~~~ 1. **Data Classification** * Clear classification of data sensitivity * Handling procedures for each classification * Access controls based on classification * Retention policies by data type 2. **Data Minimization** * Only necessary data is collected * Automatic data pruning * Anonymization where possible * Purpose limitation 3. **User Consent** * Clear consent mechanisms * Granular permission options * Easy consent withdrawal * Consent records Privacy Features ~~~~~~~~~~~~~ 1. **User Privacy Controls** * Data export functionality * Account deletion * Privacy settings management * Usage tracking opt-out 2. **Data Portability** * Export in standard formats * Complete data export * Machine-readable formats * Import capabilities 3. **Transparency** * Clear privacy policy * Data usage explanations * Third-party data sharing disclosure * Processing activities documentation Security Testing -------------- Vulnerability Management ~~~~~~~~~~~~~~~~~~~~~ 1. **Security Testing** * Regular penetration testing * Static application security testing (SAST) * Dynamic application security testing (DAST) * Software composition analysis (SCA) 2. **Bug Bounty Program** * Responsible disclosure policy * Security researcher engagement * Vulnerability triage process * Remediation tracking 3. **Security Reviews** * Code reviews with security focus * Architecture security reviews * Threat modeling * Security design reviews Incident Response ~~~~~~~~~~~~~~~ 1. **Incident Response Plan** * Defined incident response procedures * Roles and responsibilities * Communication templates * Escalation paths 2. **Breach Notification** * Legal compliance with notification requirements * User communication plan * Regulatory reporting procedures * Post-incident analysis 3. **Recovery Procedures** * Backup and restore testing * Business continuity planning * Disaster recovery procedures * Service level objectives Security Roadmap -------------- Planned Security Enhancements ~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1. **Short-term (0-6 months)** * Implement multi-factor authentication * Enhance API key management * Improve security logging * Conduct initial penetration test 2. **Medium-term (6-12 months)** * Implement security information and event management (SIEM) * Enhance data encryption * Develop comprehensive security training * Implement automated security testing in CI/CD 3. **Long-term (12+ months)** * Achieve SOC 2 compliance * Implement advanced threat protection * Develop zero-trust architecture * Enhance privacy features for international compliance