fix: Complete Keycloak external IdP integration with all tests passing
This commit completes the Keycloak external IdP integration for the MCP
server, implementing ADR-002 Tier 2 (External Identity Provider) with
full Bearer token authentication support.
Key Changes:
1. **Keycloak backchannel-dynamic configuration**
- Added --hostname-strict=false and --hostname-backchannel-dynamic=true
- Allows external issuer (localhost:8888) with internal endpoints (keycloak:8080)
- Solves Docker networking issue where containers can't reach localhost
2. **CORSMiddleware Bearer token patch**
- Created app-hooks/patches/cors-bearer-token.patch from upstream commit 8fb5e77db82
- Allows Bearer tokens to bypass CORS/CSRF checks (stateless authentication)
- Applied via post-installation hook 20-apply-cors-bearer-token-patch.sh
- Enables app-specific APIs (Notes, Calendar, etc.) to work with Bearer tokens
3. **Patch organization**
- Moved patches to app-hooks/patches/ directory
- Updated docker-compose.yml to mount entire app-hooks directory
- Consolidated patch management for better maintainability
4. **Test improvements**
- All 11 Keycloak integration tests passing
- Tests validate OAuth token acquisition, MCP connectivity, token validation,
tool execution, token persistence, user provisioning, scope filtering,
and error handling
Architecture:
- Keycloak acts as external OAuth/OIDC identity provider
- MCP server uses Keycloak tokens to access Nextcloud APIs
- Nextcloud user_oidc app validates Bearer tokens from Keycloak
- No admin credentials needed - all API access uses user's OAuth tokens
Cache Note:
- Discovery and JWKS caches must be cleared when switching Keycloak configurations
- Use: docker compose exec redis redis-cli DEL "<cache-key>"
- Or: docker compose exec app php occ user_oidc:provider keycloak --clientid nextcloud
Related:
- ADR-002: Vector sync background jobs authentication
- Validates external IdP integration pattern
- Demonstrates offline_access with refresh tokens (Tier 1 & 2)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Chris Coutinho
+26
-38
@@ -268,21 +268,22 @@ async def load_oauth_client_credentials(
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logger.info("Using pre-configured OAuth client credentials from environment")
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return (client_id, client_secret)
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# Try loading from storage file
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storage_path = os.getenv(
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"NEXTCLOUD_OIDC_CLIENT_STORAGE", ".nextcloud_oauth_client.json"
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)
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from pathlib import Path
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# Try loading from SQLite storage
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try:
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from nextcloud_mcp_server.auth.refresh_token_storage import RefreshTokenStorage
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from nextcloud_mcp_server.auth.client_registration import load_client_from_file
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storage = RefreshTokenStorage.from_env()
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await storage.initialize()
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client_info = load_client_from_file(Path(storage_path))
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if client_info:
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logger.info(
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f"Loaded OAuth client from storage: {client_info.client_id[:16]}..."
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)
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return (client_info.client_id, client_info.client_secret)
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client_data = await storage.get_oauth_client()
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if client_data:
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logger.info(
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f"Loaded OAuth client from SQLite: {client_data['client_id'][:16]}..."
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)
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return (client_data["client_id"], client_data["client_secret"])
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except ValueError:
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# TOKEN_ENCRYPTION_KEY not set, skip SQLite storage check
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logger.debug("SQLite storage not available (TOKEN_ENCRYPTION_KEY not set)")
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# Try dynamic registration if available
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if registration_endpoint:
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@@ -334,15 +335,17 @@ async def load_oauth_client_credentials(
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token_type = "Bearer"
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logger.info(f"Requesting token type: {token_type}")
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# Load or register client
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from nextcloud_mcp_server.auth.client_registration import (
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load_or_register_client,
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)
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# Ensure OAuth client in SQLite storage
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from nextcloud_mcp_server.auth.client_registration import ensure_oauth_client
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from nextcloud_mcp_server.auth.refresh_token_storage import RefreshTokenStorage
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client_info = await load_or_register_client(
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storage = RefreshTokenStorage.from_env()
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await storage.initialize()
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client_info = await ensure_oauth_client(
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nextcloud_url=nextcloud_host,
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registration_endpoint=registration_endpoint,
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storage_path=storage_path,
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storage=storage,
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client_name=f"Nextcloud MCP Server ({token_type})",
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redirect_uris=redirect_uris,
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scopes=scopes,
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@@ -356,8 +359,9 @@ async def load_oauth_client_credentials(
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raise ValueError(
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"OAuth mode requires either:\n"
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"1. NEXTCLOUD_OIDC_CLIENT_ID and NEXTCLOUD_OIDC_CLIENT_SECRET environment variables, OR\n"
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"2. Pre-existing client credentials file at NEXTCLOUD_OIDC_CLIENT_STORAGE, OR\n"
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"3. Dynamic client registration enabled on Nextcloud OIDC app"
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"2. Pre-existing client credentials in SQLite storage (TOKEN_STORAGE_DB), OR\n"
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"3. Dynamic client registration enabled on Nextcloud OIDC app\n\n"
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"Note: TOKEN_ENCRYPTION_KEY is required for SQLite storage"
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)
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@@ -1026,13 +1030,6 @@ def get_app(transport: str = "sse", enabled_apps: list[str] | None = None):
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envvar="NEXTCLOUD_OIDC_CLIENT_SECRET",
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help="OAuth client secret (can also use NEXTCLOUD_OIDC_CLIENT_SECRET env var)",
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)
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@click.option(
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"--oauth-storage-path",
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envvar="NEXTCLOUD_OIDC_CLIENT_STORAGE",
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default=".nextcloud_oauth_client.json",
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show_default=True,
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help="Path to store OAuth client credentials (can also use NEXTCLOUD_OIDC_CLIENT_STORAGE env var)",
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)
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@click.option(
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"--mcp-server-url",
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envvar="NEXTCLOUD_MCP_SERVER_URL",
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@@ -1084,7 +1081,6 @@ def run(
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oauth: bool | None,
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oauth_client_id: str | None,
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oauth_client_secret: str | None,
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oauth_storage_path: str,
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mcp_server_url: str,
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nextcloud_host: str | None,
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nextcloud_username: str | None,
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@@ -1139,8 +1135,6 @@ def run(
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os.environ["NEXTCLOUD_OIDC_CLIENT_ID"] = oauth_client_id
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if oauth_client_secret:
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os.environ["NEXTCLOUD_OIDC_CLIENT_SECRET"] = oauth_client_secret
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if oauth_storage_path:
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os.environ["NEXTCLOUD_OIDC_CLIENT_STORAGE"] = oauth_storage_path
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if oauth_scopes:
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os.environ["NEXTCLOUD_OIDC_SCOPES"] = oauth_scopes
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if oauth_token_type:
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@@ -1183,13 +1177,7 @@ def run(
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click.echo("OAuth Configuration:", err=True)
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click.echo(" Mode: Dynamic Client Registration", err=True)
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click.echo(" Host: " + nextcloud_host, err=True)
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click.echo(
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" Storage: "
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+ os.getenv(
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"NEXTCLOUD_OIDC_CLIENT_STORAGE", ".nextcloud_oauth_client.json"
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),
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err=True,
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)
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click.echo(" Storage: SQLite (TOKEN_STORAGE_DB)", err=True)
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click.echo("", err=True)
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click.echo(
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"Note: Make sure 'Dynamic Client Registration' is enabled", err=True
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@@ -1,7 +1,7 @@
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"""OAuth authentication components for Nextcloud MCP server."""
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from .bearer_auth import BearerAuth
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from .client_registration import load_or_register_client, register_client
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from .client_registration import ensure_oauth_client, register_client
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from .context_helper import get_client_from_context
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from .scope_authorization import (
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InsufficientScopeError,
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@@ -20,7 +20,7 @@ __all__ = [
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"BearerAuth",
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"NextcloudTokenVerifier",
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"register_client",
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"load_or_register_client",
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"ensure_oauth_client",
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"get_client_from_context",
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"require_scopes",
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"ScopeAuthorizationError",
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@@ -1,16 +1,15 @@
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"""Dynamic client registration for Nextcloud OIDC."""
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import datetime as dt
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import json
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import logging
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import os
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import time
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from pathlib import Path
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from typing import Any
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import anyio
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import httpx
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from nextcloud_mcp_server.auth.refresh_token_storage import RefreshTokenStorage
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logger = logging.getLogger(__name__)
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@@ -170,72 +169,6 @@ async def register_client(
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raise ValueError(f"Invalid registration response: missing {e}")
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def load_client_from_file(storage_path: Path) -> ClientInfo | None:
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"""
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Load client credentials from storage file.
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Args:
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storage_path: Path to the JSON file containing client credentials
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Returns:
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ClientInfo if file exists and is valid, None otherwise
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"""
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if not storage_path.exists():
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logger.debug(f"Client storage file not found: {storage_path}")
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return None
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try:
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with open(storage_path, "r") as f:
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data = json.load(f)
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client_info = ClientInfo.from_dict(data)
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if client_info.is_expired:
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logger.warning(
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f"Stored client has expired (expired at {client_info.client_secret_expires_at})"
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)
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return None
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logger.info(f"Loaded client from storage: {client_info.client_id[:16]}...")
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if client_info.expires_soon:
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logger.warning("Client expires soon (within 5 minutes)")
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return client_info
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except (json.JSONDecodeError, KeyError, ValueError) as e:
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logger.error(f"Failed to load client from file: {e}")
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return None
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def save_client_to_file(client_info: ClientInfo, storage_path: Path):
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"""
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Save client credentials to storage file.
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Args:
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client_info: Client information to save
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storage_path: Path to save the JSON file
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Raises:
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OSError: If file cannot be written
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"""
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try:
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# Create directory if it doesn't exist
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storage_path.parent.mkdir(parents=True, exist_ok=True)
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# Write client info
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with open(storage_path, "w") as f:
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json.dump(client_info.to_dict(), f, indent=2)
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# Set restrictive permissions (owner read/write only)
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os.chmod(storage_path, 0o600)
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logger.info(f"Saved client credentials to {storage_path}")
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except OSError as e:
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logger.error(f"Failed to save client credentials: {e}")
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raise
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async def delete_client(
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nextcloud_url: str,
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client_id: str,
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@@ -362,28 +295,28 @@ async def delete_client(
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return False
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async def load_or_register_client(
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async def ensure_oauth_client(
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nextcloud_url: str,
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registration_endpoint: str,
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storage_path: str | Path,
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storage: RefreshTokenStorage,
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client_name: str = "Nextcloud MCP Server",
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redirect_uris: list[str] | None = None,
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scopes: str = "openid profile email",
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token_type: str = "Bearer",
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) -> ClientInfo:
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"""
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Load client from storage or register a new one if not found/expired.
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Ensure OAuth client exists in SQLite storage.
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This function:
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1. Checks for existing client credentials in storage
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1. Checks for existing client credentials in SQLite storage
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2. Validates the credentials are not expired
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3. Registers a new client if needed (no stored credentials or expired)
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4. Saves the new client credentials
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4. Saves the new client credentials to SQLite
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Args:
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nextcloud_url: Base URL of the Nextcloud instance
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registration_endpoint: Full URL to the registration endpoint
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storage_path: Path to store client credentials
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storage: RefreshTokenStorage instance for SQLite storage
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client_name: Name of the client application
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redirect_uris: List of redirect URIs
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scopes: Space-separated list of scopes to request (default: "openid profile email")
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@@ -396,12 +329,13 @@ async def load_or_register_client(
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httpx.HTTPStatusError: If registration fails
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ValueError: If response is invalid
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"""
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storage_path = Path(storage_path)
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# Try to load existing client
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client_info = load_client_from_file(storage_path)
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if client_info:
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return client_info
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# Try to load existing client from SQLite
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client_data = await storage.get_oauth_client()
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if client_data:
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logger.info(
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f"Loaded OAuth client from SQLite: {client_data['client_id'][:16]}..."
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)
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return ClientInfo.from_dict(client_data)
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# Register new client
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logger.info("Registering new OAuth client...")
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@@ -414,7 +348,15 @@ async def load_or_register_client(
|
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token_type=token_type,
|
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)
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||||
|
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# Save to storage
|
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save_client_to_file(client_info, storage_path)
|
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# Save to SQLite storage
|
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await storage.store_oauth_client(
|
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client_id=client_info.client_id,
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client_secret=client_info.client_secret,
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client_id_issued_at=client_info.client_id_issued_at,
|
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client_secret_expires_at=client_info.client_secret_expires_at,
|
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redirect_uris=client_info.redirect_uris,
|
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registration_access_token=client_info.registration_access_token,
|
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registration_client_uri=client_info.registration_client_uri,
|
||||
)
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||||
|
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return client_info
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|
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@@ -5,6 +5,7 @@ Securely stores and manages user refresh tokens for background operations.
|
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Tokens are encrypted at rest using Fernet symmetric encryption.
|
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"""
|
||||
|
||||
import json
|
||||
import logging
|
||||
import os
|
||||
import time
|
||||
@@ -123,6 +124,24 @@ class RefreshTokenStorage:
|
||||
"ON audit_logs(user_id, timestamp)"
|
||||
)
|
||||
|
||||
# OAuth client credentials storage
|
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await db.execute(
|
||||
"""
|
||||
CREATE TABLE IF NOT EXISTS oauth_clients (
|
||||
id INTEGER PRIMARY KEY,
|
||||
client_id TEXT UNIQUE NOT NULL,
|
||||
encrypted_client_secret BLOB NOT NULL,
|
||||
client_id_issued_at INTEGER NOT NULL,
|
||||
client_secret_expires_at INTEGER NOT NULL,
|
||||
redirect_uris TEXT NOT NULL,
|
||||
encrypted_registration_access_token BLOB,
|
||||
registration_client_uri TEXT,
|
||||
created_at INTEGER NOT NULL,
|
||||
updated_at INTEGER NOT NULL
|
||||
)
|
||||
"""
|
||||
)
|
||||
|
||||
await db.commit()
|
||||
|
||||
# Set restrictive permissions after creation
|
||||
@@ -295,6 +314,213 @@ class RefreshTokenStorage:
|
||||
|
||||
return deleted
|
||||
|
||||
async def store_oauth_client(
|
||||
self,
|
||||
client_id: str,
|
||||
client_secret: str,
|
||||
client_id_issued_at: int,
|
||||
client_secret_expires_at: int,
|
||||
redirect_uris: list[str],
|
||||
registration_access_token: Optional[str] = None,
|
||||
registration_client_uri: Optional[str] = None,
|
||||
) -> None:
|
||||
"""
|
||||
Store encrypted OAuth client credentials.
|
||||
|
||||
Args:
|
||||
client_id: OAuth client identifier
|
||||
client_secret: OAuth client secret (will be encrypted)
|
||||
client_id_issued_at: Unix timestamp when client was issued
|
||||
client_secret_expires_at: Unix timestamp when secret expires
|
||||
redirect_uris: List of redirect URIs
|
||||
registration_access_token: RFC 7592 registration token (will be encrypted)
|
||||
registration_client_uri: RFC 7592 client management URI
|
||||
"""
|
||||
if not self._initialized:
|
||||
await self.initialize()
|
||||
|
||||
# Encrypt sensitive data
|
||||
encrypted_secret = self.cipher.encrypt(client_secret.encode())
|
||||
encrypted_reg_token = (
|
||||
self.cipher.encrypt(registration_access_token.encode())
|
||||
if registration_access_token
|
||||
else None
|
||||
)
|
||||
|
||||
# Serialize redirect_uris as JSON
|
||||
redirect_uris_json = json.dumps(redirect_uris)
|
||||
now = int(time.time())
|
||||
|
||||
async with aiosqlite.connect(self.db_path) as db:
|
||||
await db.execute(
|
||||
"""
|
||||
INSERT OR REPLACE INTO oauth_clients
|
||||
(id, client_id, encrypted_client_secret, client_id_issued_at,
|
||||
client_secret_expires_at, redirect_uris, encrypted_registration_access_token,
|
||||
registration_client_uri, created_at, updated_at)
|
||||
VALUES (
|
||||
1, ?, ?, ?, ?, ?, ?, ?,
|
||||
COALESCE((SELECT created_at FROM oauth_clients WHERE id = 1), ?),
|
||||
?
|
||||
)
|
||||
""",
|
||||
(
|
||||
client_id,
|
||||
encrypted_secret,
|
||||
client_id_issued_at,
|
||||
client_secret_expires_at,
|
||||
redirect_uris_json,
|
||||
encrypted_reg_token,
|
||||
registration_client_uri,
|
||||
now,
|
||||
now,
|
||||
),
|
||||
)
|
||||
await db.commit()
|
||||
|
||||
logger.info(
|
||||
f"Stored OAuth client credentials (client_id: {client_id[:16]}..., "
|
||||
f"expires at {client_secret_expires_at})"
|
||||
)
|
||||
|
||||
# Audit log
|
||||
await self._audit_log(
|
||||
event="store_oauth_client",
|
||||
user_id="system",
|
||||
auth_method="oauth",
|
||||
)
|
||||
|
||||
async def get_oauth_client(self) -> Optional[dict]:
|
||||
"""
|
||||
Retrieve and decrypt OAuth client credentials.
|
||||
|
||||
Returns:
|
||||
Dictionary with client credentials, or None if not found or expired:
|
||||
{
|
||||
"client_id": str,
|
||||
"client_secret": str,
|
||||
"client_id_issued_at": int,
|
||||
"client_secret_expires_at": int,
|
||||
"redirect_uris": list[str],
|
||||
"registration_access_token": str | None,
|
||||
"registration_client_uri": str | None,
|
||||
}
|
||||
"""
|
||||
if not self._initialized:
|
||||
await self.initialize()
|
||||
|
||||
async with aiosqlite.connect(self.db_path) as db:
|
||||
async with db.execute(
|
||||
"""
|
||||
SELECT client_id, encrypted_client_secret, client_id_issued_at,
|
||||
client_secret_expires_at, redirect_uris,
|
||||
encrypted_registration_access_token, registration_client_uri
|
||||
FROM oauth_clients WHERE id = 1
|
||||
"""
|
||||
) as cursor:
|
||||
row = await cursor.fetchone()
|
||||
|
||||
if not row:
|
||||
logger.debug("No OAuth client credentials found in storage")
|
||||
return None
|
||||
|
||||
(
|
||||
client_id,
|
||||
encrypted_secret,
|
||||
issued_at,
|
||||
expires_at,
|
||||
redirect_uris_json,
|
||||
encrypted_reg_token,
|
||||
reg_client_uri,
|
||||
) = row
|
||||
|
||||
# Check expiration
|
||||
if expires_at < time.time():
|
||||
logger.warning(
|
||||
f"OAuth client has expired (expired at {expires_at}), deleting"
|
||||
)
|
||||
await self.delete_oauth_client()
|
||||
return None
|
||||
|
||||
try:
|
||||
# Decrypt sensitive data
|
||||
client_secret = self.cipher.decrypt(encrypted_secret).decode()
|
||||
reg_token = (
|
||||
self.cipher.decrypt(encrypted_reg_token).decode()
|
||||
if encrypted_reg_token
|
||||
else None
|
||||
)
|
||||
|
||||
# Deserialize redirect_uris
|
||||
redirect_uris = json.loads(redirect_uris_json)
|
||||
|
||||
logger.debug(
|
||||
f"Retrieved OAuth client credentials (client_id: {client_id[:16]}...)"
|
||||
)
|
||||
|
||||
return {
|
||||
"client_id": client_id,
|
||||
"client_secret": client_secret,
|
||||
"client_id_issued_at": issued_at,
|
||||
"client_secret_expires_at": expires_at,
|
||||
"redirect_uris": redirect_uris,
|
||||
"registration_access_token": reg_token,
|
||||
"registration_client_uri": reg_client_uri,
|
||||
}
|
||||
|
||||
except Exception as e:
|
||||
logger.error(f"Failed to decrypt OAuth client credentials: {e}")
|
||||
return None
|
||||
|
||||
async def delete_oauth_client(self) -> bool:
|
||||
"""
|
||||
Delete OAuth client credentials.
|
||||
|
||||
Returns:
|
||||
True if client was deleted, False if not found
|
||||
"""
|
||||
if not self._initialized:
|
||||
await self.initialize()
|
||||
|
||||
async with aiosqlite.connect(self.db_path) as db:
|
||||
cursor = await db.execute("DELETE FROM oauth_clients WHERE id = 1")
|
||||
await db.commit()
|
||||
deleted = cursor.rowcount > 0
|
||||
|
||||
if deleted:
|
||||
logger.info("Deleted OAuth client credentials from storage")
|
||||
await self._audit_log(
|
||||
event="delete_oauth_client",
|
||||
user_id="system",
|
||||
auth_method="oauth",
|
||||
)
|
||||
else:
|
||||
logger.debug("No OAuth client credentials to delete")
|
||||
|
||||
return deleted
|
||||
|
||||
async def has_oauth_client(self) -> bool:
|
||||
"""
|
||||
Check if OAuth client credentials exist (and are not expired).
|
||||
|
||||
Returns:
|
||||
True if valid client exists, False otherwise
|
||||
"""
|
||||
if not self._initialized:
|
||||
await self.initialize()
|
||||
|
||||
async with aiosqlite.connect(self.db_path) as db:
|
||||
async with db.execute(
|
||||
"SELECT client_secret_expires_at FROM oauth_clients WHERE id = 1"
|
||||
) as cursor:
|
||||
row = await cursor.fetchone()
|
||||
|
||||
if not row:
|
||||
return False
|
||||
|
||||
expires_at = row[0]
|
||||
return expires_at >= time.time()
|
||||
|
||||
async def _audit_log(
|
||||
self,
|
||||
event: str,
|
||||
|
||||
Reference in New Issue
Block a user