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- Define requirements for garth token storage in CentralDB - Specify MFA challenge tracking functionality - Outline database schema changes needed - Define API endpoints for token management
101 lines
6.5 KiB
Markdown
101 lines
6.5 KiB
Markdown
# Feature Specification: CentralDB Extension for MFA Token Management
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**Feature Branch**: `008-centraldb-mfa-tokens`
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**Created**: Thursday, December 19, 2025
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**Status**: Draft
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**Input**: Requirement to extend CentralDB to support garth token management for MFA flow in garminsync
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## User Scenarios & Testing *(mandatory)*
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### User Story 1 - Secure Garth Token Storage (Priority: P1)
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As a GarminSync service, I want to securely store garth authentication tokens (OAuth1/OAuth2) in CentralDB so that users can maintain authenticated sessions across service restarts and authenticate with MFA-enabled accounts.
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**Why this priority**: This is fundamental to the entire MFA authentication flow. Without secure token storage, users would need to re-authenticate on every service restart, defeating the purpose of persistent authentication sessions.
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**Independent Test**: Can be fully tested by authenticating a user with garth tokens, restarting the service, and verifying that tokens are still available for that user.
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**Acceptance Scenarios**:
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1. **Given** a user successfully authenticates with garth, **When** tokens are received from garth, **Then** tokens are securely stored in CentralDB with appropriate encryption
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2. **Given** garth tokens exist for a user in CentralDB, **When** the service requests tokens for that user, **Then** the tokens are retrieved and decrypted appropriately
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3. **Given** invalid or expired garth tokens in CentralDB, **When** the service attempts to use them, **Then** appropriate error handling occurs and re-authentication is required
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4. **Given** a user requests logout, **When** the logout process begins, **Then** associated garth tokens are securely removed from CentralDB
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### User Story 2 - MFA Challenge Tracking (Priority: P2)
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As an administrator of the CentralDB service, I want to track MFA challenges so that the system can properly manage multi-factor authentication flows and prevent abuse.
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**Why this priority**: Critical for security and proper MFA flow management. Enables tracking of authentication attempts and prevents brute-force attacks.
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**Independent Test**: Can be fully tested by initiating multiple MFA challenges and verifying they are properly tracked, validated, and cleaned up.
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**Acceptance Scenarios**:
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1. **Given** a user initiates MFA authentication, **When** the challenge is created, **Then** the challenge is stored in CentralDB with appropriate expiration time
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2. **Given** an MFA challenge exists in CentralDB, **When** the correct MFA code is provided, **Then** the challenge is marked as completed and can be consumed
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3. **Given** an MFA challenge exists in CentralDB, **When** the challenge expires, **Then** the challenge is no longer valid and cleaned up automatically
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4. **Given** multiple failed MFA attempts for a challenge, **When** the limit is reached, **Then** the challenge is invalidated and the user must restart authentication
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### User Story 3 - Session Management for MFA Flows (Priority: P3)
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As a user of the GarminSync service, I want to have my MFA state preserved during the authentication flow so that the system properly tracks my authentication progress.
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**Why this priority**: Improves user experience by maintaining authentication state across requests during MFA flow, especially for longer-running flows.
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**Independent Test**: Can be fully tested by initiating an MFA flow, checking that the system properly tracks the state, and then completing the flow successfully.
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**Acceptance Scenarios**:
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1. **Given** a user begins MFA authentication, **When** the session is created, **Then** MFA state is properly recorded in CentralDB
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2. **Given** an MFA session exists in CentralDB, **When** MFA is completed successfully, **Then** the session is updated to reflect MFA completion
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3. **Given** an MFA session exists in CentralDB, **When** MFA fails or times out, **Then** the session is properly cleaned up
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### Edge Cases
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- What happens when garth token encryption/decryption fails in CentralDB?
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- How does the system handle concurrent MFA attempts for the same user?
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- What occurs if CentralDB is temporarily unavailable during authentication?
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- How does the system handle very large numbers of MFA challenges (potential DoS)?
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- What happens when garth token storage exceeds allocated quotas?
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## Requirements *(mandatory)*
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### Functional Requirements
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- **FR-001**: CentralDB MUST provide secure storage for garth OAuth1 and OAuth2 tokens with encryption at rest
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- **FR-002**: CentralDB MUST provide API endpoints for storing, retrieving, and deleting garth tokens
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- **FR-003**: CentralDB MUST track MFA challenges with type, expiration time, and validation status
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- **FR-004**: CentralDB MUST enforce MFA challenge expiration and limit retry attempts
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- **FR-005**: CentralDB MUST associate garth tokens with specific user accounts for proper access control
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- **FR-006**: CentralDB MUST provide API endpoints for MFA challenge creation and validation
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- **FR-007**: CentralDB MUST maintain user session state during MFA authentication flows
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- **FR-008**: CentralDB MUST securely delete garth tokens when users log out or tokens expire
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- **FR-009**: CentralDB MUST prevent replay attacks of valid MFA codes
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- **FR-010**: CentralDB MUST log authentication attempts for security auditing purposes
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### Key Entities
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- **GarthToken**: Securely stored OAuth tokens (encrypted) with user association and metadata
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- **MFAChallenge**: Tracks authentication challenges including type, destination, status, and expiration
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- **UserSession**: Maintains session state during authentication flows, particularly MFA
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## Success Criteria *(mandatory)*
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### Measurable Outcomes
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- **SC-001**: 100% of garth tokens are stored encrypted in CentralDB with FIPS-compliant encryption
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- **SC-002**: Token retrieval operations complete within 100ms for 95% of requests
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- **SC-003**: MFA challenge validation completes within 200ms for 95% of requests
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- **SC-004**: CentralDB handles MFA flows for 10,000 concurrent users without performance degradation
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- **SC-005**: MFA challenge security mechanisms prevent 99.9% of replay and brute-force attempts
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- **SC-006**: 99.9% uptime for token storage/retrieval operations during MFA flows
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## Assumptions
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- CentralDB uses PostgreSQL or SQLite with appropriate security configurations
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- garth token data follows standard OAuth token formats
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- Encryption at rest is implemented using library-appropriate mechanisms
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- Network communication between GarminSync service and CentralDB is secured
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- Proper access controls exist between services to prevent unauthorized token access
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- GarminSync service has appropriate permissions to access token storage endpoints |