Files
nextcloud-mcp-server/docker-compose.yml
T
Chris Coutinho e331544cee feat: Implement RFC 8693 token exchange for Keycloak (ADR-002 Tier 2)
Implements OAuth 2.0 Token Exchange (RFC 8693) enabling the MCP server to
exchange service account tokens for user-scoped tokens. This provides an
alternative to refresh tokens for background operations.

**Core Implementation:**
- Added `get_service_account_token()` method to KeycloakOAuthClient for
  client_credentials grant
- Added `exchange_token_for_user()` method implementing RFC 8693 token exchange
- Fixed Fernet encryption key handling in RefreshTokenStorage (was incorrectly
  base64 decoding already-encoded keys)
- Updated OAuth configuration to support offline_access scope and refresh token
  storage infrastructure

**Keycloak Configuration:**
- Enabled `serviceAccountsEnabled` in realm-export.json
- Added `token.exchange.grant.enabled` attribute
- Added `client.token.exchange.standard.enabled` attribute (required for
  Keycloak 26.2+ Standard Token Exchange V2)
- Fresh Keycloak imports now correctly enable token exchange

**Docker Compose:**
- Added TOKEN_ENCRYPTION_KEY and ENABLE_OFFLINE_ACCESS environment variables
- Created oauth-tokens volume for refresh token storage
- Configured both mcp-oauth and mcp-keycloak services

**Testing & Documentation:**
- Added tests/manual/test_token_exchange.py - Validates complete RFC 8693 flow
- Added tests/manual/test_nextcloud_impersonate.py - Documents session-based
  impersonation limitations
- Added docs/oauth-impersonation-findings.md - Comprehensive investigation
  findings and resolution documentation

**Verified Working:**
 Service account token acquisition (client_credentials grant)
 RFC 8693 token exchange for internal-to-internal tokens
 Exchanged tokens validate with Nextcloud APIs
 Keycloak 26.4.2 Standard Token Exchange V2 support

**Known Limitations:**
- User impersonation (requested_subject) requires Keycloak Legacy V1 with
  preview features
- Cross-client token exchange limited to same realm
- Refresh token storage infrastructure ready but unused (MCP protocol limitation)

Dependencies: aiosqlite>=0.20.0

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
2025-11-02 22:03:19 +01:00

161 lines
5.9 KiB
YAML

services:
# Note: MariaDB is external service. You can find more information about the configuration here:
# https://hub.docker.com/_/mariadb
db:
# Note: Check the recommend version here: https://docs.nextcloud.com/server/latest/admin_manual/installation/system_requirements.html#server
image: docker.io/library/mariadb:lts@sha256:ae6119716edac6998ae85508431b3d2e666530ddf4e94c61a10710caec9b0f71
restart: always
command: --transaction-isolation=READ-COMMITTED
volumes:
- db:/var/lib/mysql
environment:
- MYSQL_ROOT_PASSWORD=password
- MYSQL_PASSWORD=password
- MYSQL_DATABASE=nextcloud
- MYSQL_USER=nextcloud
# Note: Redis is an external service. You can find more information about the configuration here:
# https://hub.docker.com/_/redis
redis:
image: docker.io/library/redis:alpine@sha256:59b6e694653476de2c992937ebe1c64182af4728e54bb49e9b7a6c26614d8933
restart: always
app:
image: docker.io/library/nextcloud:32.0.1@sha256:1e4eae55eebe094cae6f9e7b6e0b4bccf4a4fe7b7e6f6f8f57010994b3b2ee42
restart: always
ports:
- 0.0.0.0:8080:80
depends_on:
- redis
- db
volumes:
- nextcloud:/var/www/html
- ./app-hooks/post-installation:/docker-entrypoint-hooks.d/post-installation:ro
# Mount OIDC development directory outside /var/www/html to avoid rsync conflicts
# The post-installation hook will register /opt/apps as an additional app directory
- ./third_party/oidc:/opt/apps/oidc:ro
environment:
- NEXTCLOUD_TRUSTED_DOMAINS=app
- NEXTCLOUD_ADMIN_USER=admin
- NEXTCLOUD_ADMIN_PASSWORD=admin
- MYSQL_PASSWORD=password
- MYSQL_DATABASE=nextcloud
- MYSQL_USER=nextcloud
- MYSQL_HOST=db
- REDIS_HOST=redis
recipes:
image: docker.io/library/nginx:alpine@sha256:b3c656d55d7ad751196f21b7fd2e8d4da9cb430e32f646adcf92441b72f82b14
restart: always
volumes:
- ./tests/fixtures/test_recipe.html:/usr/share/nginx/html/test_recipe.html:ro
- ./tests/fixtures/nginx.conf:/etc/nginx/nginx.conf:ro
unstructured:
image: downloads.unstructured.io/unstructured-io/unstructured-api:latest@sha256:a43ab55898599157fb0e0e097dabb8ecdd1d8e3df1ae5b67c6e15a136b171a6c
restart: always
ports:
- 127.0.0.1:8002:8000
# Unstructured API runs on port 8000 internally
# We expose it on 8002 externally to avoid conflict
profiles:
- unstructured
mcp:
build: .
command: ["--transport", "streamable-http"]
restart: always
depends_on:
- app
ports:
- 127.0.0.1:8000:8000
environment:
- NEXTCLOUD_HOST=http://app:80
- NEXTCLOUD_USERNAME=admin
- NEXTCLOUD_PASSWORD=admin
mcp-oauth:
build: .
command: ["--transport", "streamable-http", "--oauth", "--port", "8001", "--oauth-token-type", "jwt"]
restart: always
depends_on:
- app
ports:
- 127.0.0.1:8001:8001
environment:
- NEXTCLOUD_HOST=http://app:80
- NEXTCLOUD_MCP_SERVER_URL=http://localhost:8001
- NEXTCLOUD_PUBLIC_ISSUER_URL=http://localhost:8080
- NEXTCLOUD_OIDC_CLIENT_STORAGE=/app/.oauth/nextcloud_oauth_client.json
- NEXTCLOUD_OIDC_SCOPES=openid profile email notes:read notes:write calendar:read calendar:write contacts:read contacts:write cookbook:read cookbook:write deck:read deck:write tables:read tables:write files:read files:write sharing:read sharing:write todo:read todo:write
# Offline access / refresh tokens
- ENABLE_OFFLINE_ACCESS=true
- TOKEN_ENCRYPTION_KEY=ESF1BvEQdGYsCluwMx9Cxvw3uh5pFowPH7Rg_nIliyo=
- TOKEN_STORAGE_DB=/app/data/tokens.db
# No USERNAME/PASSWORD - will use OAuth with Dynamic Client Registration
# Client credentials will be registered and stored in volume on first startup
# JWT token type is used for testing (faster validation, scopes embedded in token)
volumes:
- oauth-client-storage:/app/.oauth
- oauth-tokens:/app/data
keycloak:
image: quay.io/keycloak/keycloak:26.4.2
command: ["start-dev", "--import-realm"]
ports:
- 127.0.0.1:8888:8080
environment:
- KC_BOOTSTRAP_ADMIN_USERNAME=admin
- KC_BOOTSTRAP_ADMIN_PASSWORD=admin
volumes:
- ./keycloak/realm-export.json:/opt/keycloak/data/import/realm.json:ro
healthcheck:
test: ["CMD-SHELL", "exec 3<>/dev/tcp/localhost/8080 && echo -e 'GET /realms/nextcloud-mcp HTTP/1.1\\r\\nHost: localhost\\r\\nConnection: close\\r\\n\\r\\n' >&3 && cat <&3 | grep -q 'HTTP/1.1 200'"]
interval: 10s
timeout: 5s
retries: 30
mcp-keycloak:
build: .
command: ["--transport", "streamable-http", "--oauth", "--port", "8002"]
restart: always
depends_on:
keycloak:
condition: service_healthy
app:
condition: service_started
ports:
- 127.0.0.1:8002:8002
environment:
# OAuth Provider: Keycloak
- OAUTH_PROVIDER=keycloak
- KEYCLOAK_URL=http://keycloak:8080
- KEYCLOAK_REALM=nextcloud-mcp
- KEYCLOAK_CLIENT_ID=nextcloud-mcp-server
- KEYCLOAK_CLIENT_SECRET=mcp-secret-change-in-production
- KEYCLOAK_DISCOVERY_URL=http://keycloak:8080/realms/nextcloud-mcp/.well-known/openid-configuration
# Nextcloud API endpoint (for accessing APIs with validated token)
- NEXTCLOUD_HOST=http://app:80
- NEXTCLOUD_MCP_SERVER_URL=http://localhost:8002
- NEXTCLOUD_PUBLIC_ISSUER_URL=http://localhost:8888
# Refresh token storage (ADR-002 Tier 1)
- ENABLE_OFFLINE_ACCESS=true
- TOKEN_ENCRYPTION_KEY=ESF1BvEQdGYsCluwMx9Cxvw3uh5pFowPH7Rg_nIliyo=
- TOKEN_STORAGE_DB=/app/data/tokens.db
- NEXTCLOUD_OIDC_CLIENT_STORAGE=/app/.oauth/keycloak_oauth_client.json
# NO admin credentials - using Keycloak OAuth only!
volumes:
- keycloak-tokens:/app/data
- keycloak-oauth-storage:/app/.oauth
volumes:
nextcloud:
db:
oauth-client-storage:
oauth-tokens:
keycloak-tokens:
keycloak-oauth-storage: