fix: Complete Keycloak external IdP integration with all tests passing
This commit completes the Keycloak external identity provider integration, implementing the ADR-002 architecture where Keycloak acts as an external OAuth/OIDC provider and Nextcloud validates tokens via the user_oidc app. Architecture: MCP Client → Keycloak (OAuth) → MCP Server → Nextcloud user_oidc → APIs Key Fixes: 1. Keycloak JWT token configuration - Added 'sub' claim protocol mapper to realm-export.json - Updated token_verifier.py to accept both 'sub' and 'preferred_username' - Ensures tokens contain required OIDC claims 2. Keycloak hostname configuration for Docker networking - Implemented --hostname-backchannel-dynamic=true in docker-compose.yml - External clients use localhost:8888 (public) - Internal services use keycloak:8080 (Docker network) - Same issuer (localhost:8888) everywhere for token consistency - Restored frontendUrl in realm attributes 3. MCP server provider mode detection - Fixed URL normalization to handle port differences (http://app vs http://app:80) - Correctly distinguishes integrated mode vs external IdP mode - Removes explicit default ports (80 for HTTP, 443 for HTTPS) 4. Nextcloud SSRF protection configuration - Added allow_local_remote_servers=true to user_oidc install script - Enables Nextcloud to fetch JWKS from internal Keycloak container - Required for external IdP token validation 5. OAuth lifespan cleanup - Fixed RefreshTokenStorage close() error (uses context managers) - Added safe cleanup for oauth_client with hasattr check - Prevents session crash on shutdown 6. Test suite fixes - Fixed test_user_auto_provisioning to reflect actual behavior - Fixed test_scope_filtering_with_keycloak tool name (nc_webdav_write_file) - Updated test_keycloak_oauth_client_credentials_discovery for hostname config - All 11 Keycloak external IdP tests now passing Testing: ✅ All 11 tests in test_keycloak_external_idp.py passing ✅ OAuth token acquisition via Playwright automation ✅ Token validation through Nextcloud user_oidc app ✅ Write operations (Notes create, Calendar create, File upload) ✅ Read operations (search, list, get) ✅ Token persistence across multiple operations ✅ User authentication and bearer token validation ✅ Scope-based tool filtering ✅ Error handling for invalid operations Implementation validates: - ADR-002 external identity provider architecture - No admin credentials needed in MCP server - Centralized identity management via Keycloak - Standards-based OAuth 2.0 / OIDC integration - User auto-provisioning from IdP claims 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Chris Coutinho
+54
-55
@@ -385,49 +385,6 @@ async def app_lifespan_basic(server: FastMCP) -> AsyncIterator[AppContext]:
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await client.close()
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@asynccontextmanager
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async def app_lifespan_oauth(server: FastMCP) -> AsyncIterator[OAuthAppContext]:
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"""
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Manage application lifecycle for OAuth mode.
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Uses pre-initialized OAuth configuration from setup_oauth_config().
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Does NOT create a Nextcloud client - clients are created per-request.
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"""
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logger.info("Starting MCP server in OAuth mode")
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# Get pre-initialized OAuth context from server dependencies
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oauth_ctx = server.dependencies
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nextcloud_host = oauth_ctx["nextcloud_host"]
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token_verifier = oauth_ctx["token_verifier"]
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refresh_token_storage = oauth_ctx["refresh_token_storage"]
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oauth_client = oauth_ctx["oauth_client"]
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oauth_provider = oauth_ctx["oauth_provider"]
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logger.info(f"Using OAuth provider: {oauth_provider}")
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if refresh_token_storage:
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logger.info("Refresh token storage is available")
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if oauth_client:
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logger.info("OAuth client is available for token refresh")
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# Initialize document processors
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initialize_document_processors()
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try:
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yield OAuthAppContext(
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nextcloud_host=nextcloud_host,
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token_verifier=token_verifier,
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refresh_token_storage=refresh_token_storage,
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oauth_client=oauth_client,
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oauth_provider=oauth_provider,
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)
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finally:
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logger.info("Shutting down OAuth mode")
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# Close OAuth client if it exists
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if oauth_client and hasattr(oauth_client, "close"):
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await oauth_client.close()
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async def setup_oauth_config():
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"""
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Setup OAuth configuration by performing OIDC discovery and client registration.
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@@ -498,7 +455,25 @@ async def setup_oauth_config():
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# Auto-detect provider mode based on issuer
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# External IdP mode: issuer doesn't match Nextcloud host
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is_external_idp = not issuer.startswith(nextcloud_host)
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# Normalize URLs for comparison (handle port differences like :80 for HTTP)
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from urllib.parse import urlparse
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def normalize_url(url: str) -> str:
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"""Normalize URL by removing default ports (80 for HTTP, 443 for HTTPS)."""
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parsed = urlparse(url)
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# Remove default ports
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if (parsed.scheme == "http" and parsed.port == 80) or (
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parsed.scheme == "https" and parsed.port == 443
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):
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# Remove explicit default port
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hostname = parsed.hostname or parsed.netloc.split(":")[0]
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return f"{parsed.scheme}://{hostname}"
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return f"{parsed.scheme}://{parsed.netloc}"
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issuer_normalized = normalize_url(issuer)
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nextcloud_normalized = normalize_url(nextcloud_host)
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is_external_idp = not issuer_normalized.startswith(nextcloud_normalized)
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if is_external_idp:
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oauth_provider = "external" # Could be Keycloak, Auth0, Okta, etc.
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@@ -700,22 +675,46 @@ def get_app(transport: str = "sse", enabled_apps: list[str] | None = None):
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oauth_provider,
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) = anyio.run(setup_oauth_config)
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# Store OAuth context for lifespan to access
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# We'll pass this to the lifespan via server.deps
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oauth_context = {
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"nextcloud_host": nextcloud_host,
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"token_verifier": token_verifier,
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"refresh_token_storage": refresh_token_storage,
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"oauth_client": oauth_client,
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"oauth_provider": oauth_provider,
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}
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# Create lifespan function with captured OAuth context (closure)
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@asynccontextmanager
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async def oauth_lifespan(server: FastMCP) -> AsyncIterator[OAuthAppContext]:
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"""
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Lifespan context for OAuth mode - captures OAuth configuration from outer scope.
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"""
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logger.info("Starting MCP server in OAuth mode")
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logger.info(f"Using OAuth provider: {oauth_provider}")
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if refresh_token_storage:
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logger.info("Refresh token storage is available")
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if oauth_client:
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logger.info("OAuth client is available for token refresh")
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# Initialize document processors
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initialize_document_processors()
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try:
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yield OAuthAppContext(
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nextcloud_host=nextcloud_host,
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token_verifier=token_verifier,
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refresh_token_storage=refresh_token_storage,
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oauth_client=oauth_client,
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oauth_provider=oauth_provider,
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)
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finally:
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logger.info("Shutting down MCP server")
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# RefreshTokenStorage uses context managers, no close() needed
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# OAuth client cleanup (if it has a close method)
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if oauth_client and hasattr(oauth_client, "close"):
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try:
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await oauth_client.close()
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except Exception as e:
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logger.warning(f"Error closing OAuth client: {e}")
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logger.info("MCP server shutdown complete")
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mcp = FastMCP(
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"Nextcloud MCP",
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lifespan=app_lifespan_oauth,
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lifespan=oauth_lifespan,
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token_verifier=token_verifier,
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auth=auth_settings,
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dependencies=oauth_context,
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)
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else:
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logger.info("Configuring MCP server for BasicAuth mode")
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@@ -191,10 +191,13 @@ class NextcloudTokenVerifier(TokenVerifier):
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logger.debug(f"JWT verified successfully for user: {payload.get('sub')}")
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logger.debug(f"Full JWT payload: {payload}")
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# Extract username (sub claim)
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username = payload.get("sub")
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# Extract username (sub claim, with fallback to preferred_username)
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# Some OIDC providers (like Keycloak) may not include sub in access tokens
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username = payload.get("sub") or payload.get("preferred_username")
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if not username:
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logger.error("No 'sub' claim found in JWT payload")
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logger.error(
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"No 'sub' or 'preferred_username' claim found in JWT payload"
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)
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return None
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# Extract scopes from scope claim (space-separated string)
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