OAuth Authentication

Task 1.1: Design OAuth authentication flow

• Description: Create sequence diagrams for OAuth login, token refresh, and logout flows
• Team/Role: Backend architecture team
• Estimated Duration: 3-4 hours
• Dependencies: None
• Deliverables:
  • Authentication flow diagrams (Mermaid format)
  • State management design
  • Error handling strategy
• Acceptance Criteria:
  • Covers Google and GitHub OAuth flows
  • Includes token refresh and expiration handling
  • Addresses security principle P05 (Controlled Access to Vault Data)

Task 1.2: Design database schema for OAuth users and sessions

• Description: Define database schema for storing OAuth provider information, user mappings, and session tokens
• Team/Role: Backend architecture team
• Estimated Duration: 2-3 hours
• Dependencies: None
• Deliverables:
  • Schema definition (SQL)
  • Index specifications
  • Migration script outline
• Acceptance Criteria:
  • Normalized schema, no redundant data
  • Protected Data encrypted at rest (P02)
  • Supports multiple OAuth providers per user

Task 1.3: Security threat modeling for OAuth integration

• Description: Conduct threat modeling session to identify OAuth-specific security risks
• Team/Role: Security team (can use Skill(threat-modeling) if available)
• Estimated Duration: 3-4 hours
• Dependencies: Task 1.1 complete (need flow diagrams)
• Deliverables:
  • Security definition document
  • Threat catalog with STRIDE analysis
  • Mitigation requirements
• Acceptance Criteria:
  • Addresses token storage security
  • Covers CSRF, token replay, and session hijacking threats
  • Defines secure channel requirements (P01 Zero Knowledge maintained)

Phase 2: Implementation

Task 2.1: Implement OAuth client library integration

• Description: Integrate OAuth client libraries for Google and GitHub, implement authorization code flow
• Team/Role: Backend implementation team
• Estimated Duration: 6-8 hours
• Dependencies: Task 1.1, Task 1.3 (need flow design and security requirements)
• Deliverables:
  • OAuth client wrapper classes
  • Configuration management for client IDs/secrets
  • Authorization request and callback handlers
• Acceptance Criteria:
  • Can initiate OAuth flow with Google and GitHub
  • Handles authorization callbacks correctly
  • Implements PKCE for additional security

Task 2.2: Implement user session management

• Description: Create session middleware to manage OAuth tokens, refresh logic, and user authentication state
• Team/Role: Backend implementation team
• Estimated Duration: 4-6 hours
• Dependencies: Task 1.2, Task 2.1 (need schema and OAuth client)
• Deliverables:
  • Session middleware
  • Token storage and retrieval logic
  • Automatic token refresh implementation
• Acceptance Criteria:
  • Sessions persist across requests
  • Tokens refresh automatically before expiration
  • Encrypted token storage (P02)

Task 2.3: Implement authentication middleware

• Description: Create middleware to protect routes requiring authentication, verify OAuth tokens
• Team/Role: Backend implementation team
• Estimated Duration: 3-4 hours
• Dependencies: Task 2.2 (need session management)
• Deliverables:
  • Authentication middleware
  • Route protection decorators
  • Unauthorized access handling
• Acceptance Criteria:
  • Protected routes require valid OAuth authentication
  • Returns 401 for unauthenticated requests
  • Returns 403 for unauthorized access attempts

Task 2.4: Create OAuth login UI components

• Description: Build UI components for OAuth provider selection and login flow
• Team/Role: Frontend implementation team
• Estimated Duration: 4-5 hours
• Dependencies: Task 2.1 (need backend OAuth endpoints)
• Deliverables:
  • Login page with provider buttons
  • OAuth callback handling UI
  • Error messaging UI
• Acceptance Criteria:
  • Displays Google and GitHub login options
  • Handles OAuth redirects properly
  • Shows clear error messages for failed authentication

Task 2.5: Implement user account linking

• Description: Allow existing users to link OAuth providers to their accounts
• Team/Role: Backend implementation team
• Estimated Duration: 5-6 hours
• Dependencies: Task 2.2, Task 2.3 (need session and auth middleware)
• Deliverables:
  • Account linking endpoints
  • Provider management UI backend
  • Unlinking functionality
• Acceptance Criteria:
  • Users can link multiple OAuth providers
  • Can unlink providers (if not sole login method)
  • Existing vault data remains accessible

Phase 3: Testing

Task 3.1: Write OAuth integration unit tests

• Description: Create comprehensive unit tests for OAuth client, session management, and authentication middleware
• Team/Role: QA team / Backend team
• Estimated Duration: 5-6 hours
• Dependencies: Phase 2 implementation tasks complete
• Deliverables:
  • Unit test suite with >85% code coverage
  • Mock OAuth provider responses
  • Token lifecycle tests
• Acceptance Criteria:
  • All OAuth flows tested (login, refresh, logout)
  • Error scenarios covered (invalid tokens, expired tokens, provider errors)
  • Security checks validated (CSRF, token encryption)

Task 3.2: Create OAuth integration end-to-end tests

• Description: Build automated E2E tests using test OAuth providers
• Team/Role: QA team
• Estimated Duration: 6-8 hours
• Dependencies: Task 3.1, Phase 2 complete
• Deliverables:
  • E2E test suite for OAuth flows
  • Test OAuth provider configurations
  • Cross-browser test coverage
• Acceptance Criteria:
  • Complete login/logout flows tested
  • Account linking flows tested
  • Error handling verified
  • Tests run on Chrome, Firefox, Safari

Task 3.3: Manual cross-platform testing

• Description: Manually test OAuth on all Bitwarden clients (web, desktop, mobile)
• Team/Role: QA team
• Estimated Duration: 4-5 hours
• Dependencies: Phase 2 complete, Task 3.2 (automated tests pass)
• Deliverables:
  • Test execution report
  • Bug tracking for any issues found
  • Platform-specific behavior documentation
• Acceptance Criteria:
  • OAuth works on web vault, desktop apps (Windows, macOS, Linux), mobile (iOS, Android)
  • User experience consistent across platforms
  • No regressions in existing authentication

Task 3.4: Security testing and penetration testing

• Description: Conduct security-focused testing of OAuth implementation
• Team/Role: Security team
• Estimated Duration: 6-8 hours
• Dependencies: Task 3.1, Task 3.2 (functional testing complete)
• Deliverables:
  • Security test report
  • Penetration test findings
  • Mitigation verification
• Acceptance Criteria:
  • No high or critical security vulnerabilities found
  • All threat model mitigations verified
  • Token storage encryption validated
  • CSRF protections confirmed

Phase 4: Documentation & Deployment

Task 4.1: Write OAuth setup documentation

• Description: Create user-facing documentation for setting up and using OAuth login
• Team/Role: Technical writing team
• Estimated Duration: 3-4 hours
• Dependencies: Phase 2 implementation complete
• Deliverables:
  • User guide for OAuth login
  • Provider configuration instructions
  • Troubleshooting guide
• Acceptance Criteria:
  • Covers Google and GitHub setup steps
  • Includes screenshots of login flow
  • Addresses common issues

Task 4.2: Create API documentation for OAuth endpoints

• Description: Document all OAuth-related API endpoints for developer reference
• Team/Role: Backend team / Technical writing
• Estimated Duration: 2-3 hours
• Dependencies: Phase 2 implementation complete
• Deliverables:
  • API endpoint documentation
  • Request/response examples
  • Error code reference
• Acceptance Criteria:
  • All endpoints documented with examples
  • Authentication requirements specified
  • Rate limits and constraints noted

Task 4.3: Prepare deployment and migration procedures

• Description: Create deployment scripts, database migrations, and rollout plan
• Team/Role: DevOps team
• Estimated Duration: 4-5 hours
• Dependencies: Phase 2 complete, Task 3.1-3.4 (all testing passed)
• Deliverables:
  • Database migration scripts
  • Deployment runbook
  • Rollback procedures
• Acceptance Criteria:
  • Migrations tested on staging environment
  • Zero-downtime deployment plan
  • Rollback tested and verified

Why This Breakdown Works:

• ✅ Each task is 2-8 hours (right-sized for tracking)
• ✅ Clear dependencies prevent blocking and enable parallel work
• ✅ Phases group related work logically
• ✅ Each task has specific team assignment and acceptance criteria
• ✅ Can be implemented and tested incrementally
• ✅ Security considerations integrated throughout
• ✅ Documentation and deployment explicitly planned