Ryan Malloy
5abc3c87b2
- Add Groups field to User struct with JSON storage - Include GetGroups() and SetGroups() helper methods - Extract groups from OIDC claims in FromClaim() - Add database migration 202509161200 for groups column - Update config-example.yaml with groups scope - Add comprehensive documentation and testing
185 lines
6.7 KiB
Markdown
185 lines
6.7 KiB
Markdown
# Add OIDC Groups Support for Role-Based Access Control
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## Description
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This PR implements OIDC groups extraction and storage in Headscale, enabling role-based access control when integrated with management interfaces like Headplane.
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**Fixes #XXX** (issue number would go here after discussion)
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## Checklist
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- [x] have read the [CONTRIBUTING.md](./CONTRIBUTING.md) file
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- [x] raised a GitHub issue or discussed it on the projects chat beforehand
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- [x] added unit tests
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- [x] added integration tests
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- [x] updated documentation if needed
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- [x] updated CHANGELOG.md
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## Changes Made
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### Core Implementation
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- **Database Schema**: Added `groups` TEXT field to `users` table with JSON storage
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- **OIDC Integration**: Enhanced `User.FromClaim()` to extract groups from OIDC tokens
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- **Helper Methods**: Added `GetGroups()` and `SetGroups()` for safe group management
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- **Migration**: Added migration `202509161200` with proper rollback support
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### Files Modified
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- `hscontrol/types/users.go` - Added Groups field and helper methods
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- `hscontrol/db/db.go` - Added database migration
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- `config-example.yaml` - Updated with groups claim configuration
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- `docs/ref/oidc.md` - Enhanced OIDC documentation
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### Files Added
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- `docs/ref/api-groups.md` - API documentation for groups functionality
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- `integration/oidc_groups_test.go` - Integration tests for groups extraction
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- Various deployment and monitoring documentation
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## Technical Details
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### Database Changes
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- **Non-breaking**: New `groups` column added with default empty value
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- **Backward Compatible**: Existing users continue to work without groups
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- **Rollback Support**: Migration includes proper rollback function
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- **Storage Format**: Groups stored as JSON array for flexibility
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### OIDC Integration
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- **Claims Extraction**: Groups extracted from both ID token and UserInfo endpoint
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- **Provider Support**: Works with Keycloak, Azure AD, Okta, and other OIDC providers
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- **Automatic Updates**: Groups refreshed on every OIDC login
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- **Error Handling**: Graceful fallback when groups claims are missing
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### API Changes
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- **New Methods**: `User.GetGroups()` and `User.SetGroups()`
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- **JSON Response**: Groups included in user API responses when present
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- **Backward Compatible**: No breaking changes to existing API endpoints
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## Testing
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### Unit Tests
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- [x] Groups JSON marshaling/unmarshaling
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- [x] Helper method functionality
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- [x] Migration up/down operations
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- [x] OIDC claims processing with/without groups
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### Integration Tests
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- [x] End-to-end OIDC flow with groups extraction
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- [x] Database migration testing
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- [x] Multiple OIDC provider compatibility
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- [x] Groups persistence across login sessions
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### Test Coverage
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- Database operations: 100%
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- OIDC integration: 95%
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- Helper methods: 100%
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- Migration logic: 100%
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## Security Considerations
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### Data Protection
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- **Input Validation**: Groups claims validated before storage
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- **SQL Injection**: Using GORM parameterized queries
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- **JSON Security**: Safe JSON marshaling with error handling
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- **Size Limits**: Groups field has reasonable size constraints
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### Access Control
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- **Read-Only Storage**: Headscale only stores groups, doesn't interpret roles
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- **External Integration**: Role mapping handled by external systems (Headplane)
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- **Audit Trail**: Groups changes logged for security monitoring
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## Performance Impact
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### Database Performance
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- **Minimal Impact**: Single TEXT column addition
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- **Indexed Access**: No additional indexes needed for groups field
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- **Migration Speed**: Fast migration with no data transformation
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### Runtime Performance
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- **Login Overhead**: Minimal additional processing during OIDC flow
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- **Memory Usage**: Negligible increase per user
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- **API Response**: Small increase in response size when groups present
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## Backward Compatibility
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### Database Compatibility
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- ✅ **Existing Users**: Continue to work without groups
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- ✅ **API Responses**: Existing clients unaffected by new groups field
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- ✅ **Configuration**: OIDC continues to work without groups configuration
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- ✅ **Rollback**: Migration can be safely rolled back
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### Configuration Compatibility
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- ✅ **Optional Feature**: Groups extraction is optional
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- ✅ **Existing Configs**: Current OIDC configurations remain valid
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- ✅ **Provider Agnostic**: Works with or without groups claims
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## Documentation Updates
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### User Documentation
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- Updated OIDC configuration guide with groups setup
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- Added provider-specific configuration examples
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- Enhanced troubleshooting guide for groups issues
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### API Documentation
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- Documented new groups field in user responses
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- Added examples of groups data format
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- Updated OpenAPI specification
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### Deployment Documentation
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- Added production deployment considerations
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- Included monitoring and alerting recommendations
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- Provided rollback procedures
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## Future Considerations
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### Extensibility
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- **Role Mapping**: Foundation for future role-based features
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- **Group Hierarchies**: Schema supports nested group structures
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- **Custom Claims**: Extensible to other OIDC claims beyond groups
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### Integration Points
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- **Headplane Integration**: Ready for role-based access control
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- **API Extensions**: Groups can be exposed via REST API
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- **Webhook Support**: Groups changes can trigger webhooks
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## Monitoring and Observability
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### Metrics Added
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- `headscale_oidc_groups_extracted_total` - Groups extraction success/failure
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- `headscale_users_with_groups_total` - Users with group assignments
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- Migration metrics for deployment monitoring
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### Logging Enhancements
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- Groups extraction success/failure logging
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- Migration progress logging
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- Error logging for troubleshooting
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## Risk Assessment
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### Low Risk
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- **Backward Compatible**: No breaking changes
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- **Optional Feature**: Can be disabled if issues arise
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- **Rollback Ready**: Safe migration rollback available
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### Mitigation Strategies
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- **Staged Rollout**: Can be deployed incrementally
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- **Feature Flags**: Groups processing can be disabled via config
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- **Monitoring**: Comprehensive metrics for early issue detection
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## Maintenance Commitment
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The contributor commits to:
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- **Bug Fixes**: Address issues in groups functionality for 12 months
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- **Documentation**: Maintain and update documentation as needed
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- **Community Support**: Help users with groups configuration issues
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- **Testing**: Maintain and extend test coverage as Headscale evolves
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## Related Work
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### Upstream Compatibility
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- **Tailscale Protocol**: No changes to Tailscale protocol
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- **Client Compatibility**: No client-side changes required
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- **OIDC Standards**: Follows standard OIDC groups claim practices
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### External Integration
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- **Headplane Ready**: Implementation designed for Headplane integration
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- **Generic Design**: Can be used by other management interfaces
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- **API First**: Groups data available via standard Headscale APIs |