Fix two issues preventing OAuth tests from passing:
1. Set oidc_client_id and oidc_client_secret on Settings object
- These were being read from environment but not propagated to the
UnifiedTokenVerifier settings instance
2. Use client_issuer instead of issuer for JWT validation
- client_issuer accounts for NEXTCLOUD_PUBLIC_ISSUER_URL override
- Fixes "Invalid issuer" errors when public URL differs from internal
3. Accept resource URL with /mcp path in audience validation
- During DCR, resource_url is registered as "{mcp_server_url}/mcp"
- Tokens correctly include this full path as audience
- Verifier now accepts both "http://localhost:8001" and
"http://localhost:8001/mcp" as valid MCP audiences
These changes restore OAuth functionality while maintaining ADR-005
security requirements for proper audience validation.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Replace two non-compliant token verifiers (NextcloudTokenVerifier and
ProgressiveConsentTokenVerifier) with a single UnifiedTokenVerifier that properly
validates token audiences per MCP Security Best Practices specification.
The previous implementation had a critical security vulnerability where tokens
intended for the MCP server were passed directly to Nextcloud APIs without
proper audience validation (token passthrough anti-pattern). This violates
OAuth 2.0 security principles and the MCP specification.
Changes:
- Add UnifiedTokenVerifier supporting two compliant modes:
* Multi-audience mode (default): Validates tokens contain BOTH MCP and
Nextcloud audiences, enabling direct use without exchange
* Token exchange mode (opt-in): Validates MCP audience only, exchanges
for Nextcloud tokens via RFC 8693 with caching to minimize latency
- Remove token passthrough vulnerability from context.py and context_helper.py
- Implement token exchange caching (5-minute TTL default) to reduce network calls
- Add required environment variables for audience validation:
* NEXTCLOUD_MCP_SERVER_URL - MCP server URL (used as audience)
* NEXTCLOUD_RESOURCE_URI - Nextcloud resource identifier
* TOKEN_EXCHANGE_CACHE_TTL - Cache TTL for exchanged tokens
- Update docker-compose.yml with resource URI configuration for both OAuth modes
- Add comprehensive test suite (29 tests) covering both authentication modes
- Remove legacy NextcloudTokenVerifier and ProgressiveConsentTokenVerifier
Security improvements:
- Eliminates token passthrough anti-pattern
- Enforces proper audience separation between MCP and Nextcloud
- Complies with MCP Security Best Practices and RFC 8707/8693
- Maintains performance with token exchange caching
Test results: 65/65 unit tests passed, 5/5 smoke tests passed
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
