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feat: Implement ADR-005 unified token verifier to eliminate token passthrough vulnerability

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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>
This commit is contained in:
Chris Coutinho
2025-11-05 18:53:14 +01:00
parent 28c2debf3e
commit 9fab6cb550
12 changed files with 1199 additions and 950 deletions
Download Patch File Download Diff File Expand all files Collapse all files
app-hooks/post-installation/10-install-oidc-app.sh
+1
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@@ -35,5 +35,6 @@ php /var/www/html/occ config:app:set oidc dynamic_client_registration --value='t
php /var/www/html/occ config:app:set oidc proof_key_for_code_exchange --value=true --type=boolean
php /var/www/html/occ config:app:set oidc allow_user_settings --value='enabled'
php /var/www/html/occ config:app:set oidc default_token_type --value='jwt'
php /var/www/html/occ config:app:set oidc default_resource_identifier --value='http://localhost:8080'
echo "OIDC app installed and configured successfully"
app-hooks/post-installation/30-disable-welcome-wizard.sh
Executable
+3
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@@ -0,0 +1,3 @@
#!/bin/bash
php /var/www/html/occ config:app:set --value false firstrunwizard wizard_enabled
docker-compose.yml
+9 -3
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@@ -96,6 +96,7 @@ services:
# OIDC_CLIENT_ID not set - uses Dynamic Client Registration (DCR)
- NEXTCLOUD_HOST=http://app:80
- NEXTCLOUD_MCP_SERVER_URL=http://localhost:8001
- NEXTCLOUD_RESOURCE_URI=http://localhost:8080 # ADR-005: Nextcloud resource identifier for audience validation
- NEXTCLOUD_PUBLIC_ISSUER_URL=http://localhost:8080
- 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
@@ -104,8 +105,9 @@ services:
- TOKEN_ENCRYPTION_KEY=ESF1BvEQdGYsCluwMx9Cxvw3uh5pFowPH7Rg_nIliyo=
- TOKEN_STORAGE_DB=/app/data/tokens.db
# ADR-004: Use Hybrid Flow (server intercepts OAuth callback)
# Set to false to enable Hybrid Flow tests - server stores refresh token and issues MCP codes
# ADR-005: Multi-audience mode (default - ENABLE_TOKEN_EXCHANGE=false)
# Tokens must contain BOTH MCP and Nextcloud audiences
# No token exchange needed - tokens work for both MCP auth and Nextcloud APIs
# NO admin credentials - using OAuth with Dynamic Client Registration (DCR)
# Client credentials registered via RFC 7591 and stored in volume
@@ -159,6 +161,7 @@ services:
# Nextcloud API endpoint (for accessing APIs with validated token)
- NEXTCLOUD_HOST=http://app:80
- NEXTCLOUD_MCP_SERVER_URL=http://localhost:8002
- NEXTCLOUD_RESOURCE_URI=http://localhost:8080 # ADR-005: Nextcloud resource identifier for audience validation
- NEXTCLOUD_PUBLIC_ISSUER_URL=http://localhost:8888/realms/nextcloud-mcp
# Refresh token storage (ADR-002 Tier 1 & 2)
@@ -166,8 +169,11 @@ services:
- TOKEN_ENCRYPTION_KEY=ESF1BvEQdGYsCluwMx9Cxvw3uh5pFowPH7Rg_nIliyo=
- TOKEN_STORAGE_DB=/app/data/tokens.db
# Token exchange (RFC 8693) - convert aud:nextcloud-mcp-server → aud:nextcloud
# ADR-005: Token exchange mode (RFC 8693)
# Exchange MCP tokens (aud: nextcloud-mcp-server) for Nextcloud tokens (aud: http://localhost:8080)
# Provides strict audience separation between MCP session and Nextcloud API access
- ENABLE_TOKEN_EXCHANGE=true
- TOKEN_EXCHANGE_CACHE_TTL=300 # Cache exchanged tokens for 5 minutes (default)
# OAuth scopes (optional - uses defaults if not specified)
- NEXTCLOUD_OIDC_SCOPES=openid profile email offline_access 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
nextcloud_mcp_server/app.py
+62 -37
View File
@@ -27,9 +27,7 @@ from nextcloud_mcp_server.auth import (
has_required_scopes,
is_jwt_token,
)
from nextcloud_mcp_server.auth.progressive_token_verifier import (
ProgressiveConsentTokenVerifier,
)
from nextcloud_mcp_server.auth.unified_verifier import UnifiedTokenVerifier
from nextcloud_mcp_server.client import NextcloudClient
from nextcloud_mcp_server.config import (
LOGGING_CONFIG,
@@ -215,9 +213,7 @@ class OAuthAppContext:
"""Application context for OAuth mode."""
nextcloud_host: str
token_verifier: (
object # Can be NextcloudTokenVerifier or ProgressiveConsentTokenVerifier
)
token_verifier: object # UnifiedTokenVerifier (ADR-005 compliant)
refresh_token_storage: Optional["RefreshTokenStorage"] = None
oauth_client: Optional[object] = None # NextcloudOAuthClient or KeycloakOAuthClient
oauth_provider: str = "nextcloud" # "nextcloud" or "keycloak"
@@ -555,46 +551,75 @@ async def setup_oauth_config():
else:
client_issuer = issuer
# Progressive Consent mode (always enabled) - dual OAuth flows with audience separation
logger.info("✓ Progressive Consent mode enabled - dual OAuth flows active")
# ADR-005: Unified Token Verifier with proper audience validation
# Get MCP server URL for audience validation
mcp_server_url = os.getenv("NEXTCLOUD_MCP_SERVER_URL", "http://localhost:8000")
nextcloud_resource_uri = os.getenv("NEXTCLOUD_RESOURCE_URI", nextcloud_host)
# Get encryption key for token broker
encryption_key = os.getenv("TOKEN_ENCRYPTION_KEY")
if not encryption_key:
# Warn if resource URIs are not configured (required for ADR-005 compliance)
if not os.getenv("NEXTCLOUD_MCP_SERVER_URL"):
logger.warning(
"TOKEN_ENCRYPTION_KEY not set - token broker will not be available"
f"NEXTCLOUD_MCP_SERVER_URL not set, defaulting to: {mcp_server_url}. "
"This should be set explicitly for proper audience validation."
)
if not os.getenv("NEXTCLOUD_RESOURCE_URI"):
logger.warning(
f"NEXTCLOUD_RESOURCE_URI not set, defaulting to: {nextcloud_resource_uri}. "
"This should be set explicitly for proper audience validation."
)
# Create token broker service
from nextcloud_mcp_server.auth.token_broker import TokenBrokerService
# Create settings for UnifiedTokenVerifier
from nextcloud_mcp_server.config import get_settings
token_broker = None
if encryption_key and refresh_token_storage:
token_broker = TokenBrokerService(
storage=refresh_token_storage,
oidc_discovery_url=discovery_url,
nextcloud_host=nextcloud_host,
encryption_key=encryption_key,
settings = get_settings()
# Override with discovered values if not set in environment
if not settings.jwks_uri:
settings.jwks_uri = jwks_uri
if not settings.introspection_uri:
settings.introspection_uri = introspection_uri
if not settings.userinfo_uri:
settings.userinfo_uri = userinfo_uri
if not settings.oidc_issuer:
settings.oidc_issuer = issuer
if not settings.nextcloud_mcp_server_url:
settings.nextcloud_mcp_server_url = mcp_server_url
if not settings.nextcloud_resource_uri:
settings.nextcloud_resource_uri = nextcloud_resource_uri
# Create Unified Token Verifier (ADR-005 compliant)
token_verifier = UnifiedTokenVerifier(settings)
# Log the mode
enable_token_exchange = (
os.getenv("ENABLE_TOKEN_EXCHANGE", "false").lower() == "true"
)
if enable_token_exchange:
logger.info(
"✓ Token Exchange mode enabled (ADR-005) - exchanging MCP tokens for Nextcloud tokens via RFC 8693"
)
logger.info("✓ Token Broker service initialized for audience-specific tokens")
logger.info(f" MCP audience: {client_id} or {mcp_server_url}")
logger.info(f" Nextcloud audience: {nextcloud_resource_uri}")
else:
logger.info(
"✓ Multi-audience mode enabled (ADR-005) - tokens must contain both MCP and Nextcloud audiences"
)
logger.info(f" Required MCP audience: {client_id} or {mcp_server_url}")
logger.info(f" Required Nextcloud audience: {nextcloud_resource_uri}")
# Create Progressive Consent token verifier
token_verifier = ProgressiveConsentTokenVerifier(
token_storage=refresh_token_storage,
token_broker=token_broker,
oidc_discovery_url=discovery_url,
nextcloud_host=nextcloud_host,
encryption_key=encryption_key,
mcp_client_id=client_id,
introspection_uri=introspection_uri,
client_secret=client_secret,
)
logger.info(
"✓ Progressive Consent verifier configured - enforcing audience separation"
)
if introspection_uri:
logger.info("✓ Opaque token introspection enabled (RFC 7662)")
if jwks_uri:
logger.info("✓ JWT signature verification enabled (JWKS)")
# Progressive Consent mode (for offline access / background jobs)
encryption_key = os.getenv("TOKEN_ENCRYPTION_KEY")
if enable_offline_access and encryption_key and refresh_token_storage:
logger.info("✓ Progressive Consent mode enabled - offline access available")
# Note: Token Broker service would be initialized here for background job support
# Currently not used in ADR-005 implementation as it's specific to offline access patterns
# that are separate from the real-time token exchange flow
logger.debug("Token broker available for future offline access features")
# Create OAuth client for server-initiated flows (e.g., token exchange, background workers)
oauth_client = None
nextcloud_mcp_server/auth/__init__.py
+2 -2
View File
@@ -14,11 +14,11 @@ from .scope_authorization import (
is_jwt_token,
require_scopes,
)
from .token_verifier import NextcloudTokenVerifier
from .unified_verifier import UnifiedTokenVerifier
__all__ = [
"BearerAuth",
"NextcloudTokenVerifier",
"UnifiedTokenVerifier",
"register_client",
"ensure_oauth_client",
"get_client_from_context",
nextcloud_mcp_server/auth/context_helper.py
+88 -36
View File
@@ -1,6 +1,11 @@
"""Helper functions for extracting OAuth context from MCP requests."""
"""Helper functions for extracting OAuth context from MCP requests.
ADR-005 compliant implementation with token exchange caching.
"""
import hashlib
import logging
import time
from mcp.server.auth.provider import AccessToken
from mcp.server.fastmcp import Context
@@ -11,35 +16,36 @@ from .token_exchange import exchange_token_for_audience
logger = logging.getLogger(__name__)
# Token exchange cache: token_hash -> (exchanged_token, expiry_timestamp)
_exchange_cache: dict[str, tuple[str, float]] = {}
def get_client_from_context(ctx: Context, base_url: str) -> NextcloudClient:
"""
Extract authenticated user context from MCP request and create NextcloudClient.
Create NextcloudClient for multi-audience mode (no exchange needed).
This function retrieves the OAuth access token from the MCP context,
extracts the username from the token's resource field (where we stored it
during token verification), and creates a NextcloudClient with bearer auth.
ADR-005 Mode 1: Token already contains both MCP and Nextcloud audiences.
The UnifiedTokenVerifier validated both audiences are present, so we can
use the token directly without exchange.
Args:
ctx: MCP request context containing session info
base_url: Nextcloud base URL
Returns:
NextcloudClient configured with bearer token auth
NextcloudClient configured with multi-audience token
Raises:
AttributeError: If context doesn't contain expected OAuth session data
ValueError: If username cannot be extracted from token
"""
try:
# In Starlette with FastMCP OAuth, the authenticated user info is stored in request.user
# The FastMCP auth middleware sets request.user to an AuthenticatedUser object
# which contains the access_token
# Extract validated access token from MCP context
if hasattr(ctx.request_context.request, "user") and hasattr(
ctx.request_context.request.user, "access_token"
):
access_token: AccessToken = ctx.request_context.request.user.access_token
logger.debug("Retrieved access token from request.user for OAuth request")
logger.debug("Retrieved multi-audience token from request.user")
else:
logger.error(
"OAuth authentication failed: No access token found in request"
@@ -47,16 +53,20 @@ def get_client_from_context(ctx: Context, base_url: str) -> NextcloudClient:
raise AttributeError("No access token found in OAuth request context")
# Extract username from resource field (RFC 8707)
# We stored the username here during token verification
# UnifiedTokenVerifier stored the username here during validation
username = access_token.resource
if not username:
logger.error("No username found in access token resource field")
raise ValueError("Username not available in OAuth token context")
logger.debug(f"Creating OAuth NextcloudClient for user: {username}")
logger.debug(
f"Creating NextcloudClient for user {username} with multi-audience token "
f"(no exchange needed)"
)
# Create client with bearer token
# Token was already validated to have both audiences
# Can use directly without exchange
return NextcloudClient.from_token(
base_url=base_url, token=access_token.token, username=username
)
@@ -71,12 +81,19 @@ async def get_session_client_from_context(
ctx: Context, base_url: str
) -> NextcloudClient:
"""
Create NextcloudClient using RFC 8693 token exchange for session operations.
Create NextcloudClient using RFC 8693 token exchange with caching.
ADR-005 Mode 2: Exchange MCP token for Nextcloud token via RFC 8693.
This implements the token exchange pattern where:
1. Extract Flow 1 token from context (aud: "mcp-server")
2. Exchange it for ephemeral Nextcloud token via RFC 8693
3. Create client with delegated token (NOT stored)
1. Extract MCP token from context (validated by UnifiedTokenVerifier)
2. Check cache for existing exchanged token
3. If not cached or expired, exchange via RFC 8693
4. Cache the exchanged token to minimize exchange frequency
5. Create client with exchanged token
CRITICAL: This is where token exchange happens, NOT in the verifier.
The verifier already validated the MCP audience; now we exchange for Nextcloud.
Note: Nextcloud doesn't support OAuth scopes natively. Scopes are enforced
by the MCP server via @require_scopes decorator, not by the IdP. Therefore,
@@ -88,7 +105,7 @@ async def get_session_client_from_context(
base_url: Nextcloud base URL
Returns:
NextcloudClient configured with ephemeral delegated token
NextcloudClient configured with ephemeral exchanged token
Raises:
AttributeError: If context doesn't contain expected OAuth session data
@@ -96,43 +113,60 @@ async def get_session_client_from_context(
"""
settings = get_settings()
# Check if token exchange is enabled
if not settings.enable_token_exchange:
logger.info("Token exchange disabled, falling back to standard OAuth flow")
return get_client_from_context(ctx, base_url)
try:
# Extract Flow 1 token from context
# Extract MCP token from context
if hasattr(ctx.request_context.request, "user") and hasattr(
ctx.request_context.request.user, "access_token"
):
access_token: AccessToken = ctx.request_context.request.user.access_token
flow1_token = access_token.token
username = access_token.resource # Username stored during verification
logger.debug(f"Retrieved Flow 1 token for user: {username}")
mcp_token = access_token.token
username = access_token.resource # Username from UnifiedTokenVerifier
logger.debug(f"Retrieved MCP token for user: {username}")
else:
logger.error("No Flow 1 token found in request context")
logger.error("No MCP token found in request context")
raise AttributeError("No access token found in OAuth request context")
if not username:
logger.error("No username found in access token resource field")
raise ValueError("Username not available in OAuth token context")
logger.info("Exchanging client token for Nextcloud API token (pure RFC 8693)")
# Check cache for existing exchanged token
cache_key = hashlib.sha256(mcp_token.encode()).hexdigest()
if cache_key in _exchange_cache:
cached_token, expiry = _exchange_cache[cache_key]
if time.time() < expiry:
logger.debug(
f"Using cached exchanged token (expires in {expiry - time.time():.1f}s)"
)
return NextcloudClient.from_token(
base_url=base_url, token=cached_token, username=username
)
else:
logger.debug("Cached token expired, removing from cache")
del _exchange_cache[cache_key]
# Perform pure RFC 8693 token exchange (no refresh tokens)
# Note: We don't pass scopes since Nextcloud doesn't enforce them.
# The MCP server's @require_scopes decorator handles authorization.
# Perform RFC 8693 token exchange
logger.info(f"Exchanging MCP token for Nextcloud API token (user: {username})")
# Exchange for Nextcloud resource URI audience
exchanged_token, expires_in = await exchange_token_for_audience(
subject_token=flow1_token,
requested_audience="nextcloud",
subject_token=mcp_token,
requested_audience=settings.nextcloud_resource_uri or "nextcloud",
requested_scopes=None, # Nextcloud doesn't support scopes
)
logger.info(f"Pure token exchange successful. Token expires in {expires_in}s")
logger.info(f"Token exchange successful. Token expires in {expires_in}s")
# Cache the exchanged token
# Use the minimum of exchange TTL and configured cache TTL
cache_ttl = min(expires_in, settings.token_exchange_cache_ttl)
_exchange_cache[cache_key] = (exchanged_token, time.time() + cache_ttl)
logger.debug(f"Cached exchanged token for {cache_ttl}s")
# Clean up expired cache entries
_cleanup_exchange_cache()
# Create client with exchanged token
# This token is ephemeral (per-request) and NOT stored
return NextcloudClient.from_token(
base_url=base_url, token=exchanged_token, username=username
)
@@ -143,3 +177,21 @@ async def get_session_client_from_context(
except Exception as e:
logger.error(f"Token exchange failed: {e}")
raise RuntimeError(f"Token exchange required but failed: {e}") from e
def _cleanup_exchange_cache():
"""Remove expired entries from the token exchange cache."""
global _exchange_cache
now = time.time()
expired_keys = [k for k, (_, expiry) in _exchange_cache.items() if expiry <= now]
for key in expired_keys:
del _exchange_cache[key]
if expired_keys:
logger.debug(f"Cleaned up {len(expired_keys)} expired cache entries")
def clear_exchange_cache():
"""Clear the entire token exchange cache. Useful for testing."""
global _exchange_cache
_exchange_cache.clear()
logger.debug("Token exchange cache cleared")
nextcloud_mcp_server/auth/progressive_token_verifier.py
-366
View File
@@ -1,366 +0,0 @@
"""
Token Verifier for ADR-004 Progressive Consent Architecture.
This module implements token verification with strict audience separation:
- Flow 1 tokens have aud: <mcp-client-id> for MCP authentication
- Flow 2 tokens have aud: "nextcloud" for resource access
- Token Broker manages the exchange between audiences
"""
import logging
import os
from datetime import datetime, timezone
from typing import Optional
import httpx
import jwt
from mcp.server.auth.provider import AccessToken
from nextcloud_mcp_server.auth.refresh_token_storage import RefreshTokenStorage
from nextcloud_mcp_server.auth.token_broker import TokenBrokerService
logger = logging.getLogger(__name__)
class ProgressiveConsentTokenVerifier:
"""
Token verifier for Progressive Consent dual OAuth flows.
This verifier:
1. Validates Flow 1 tokens (aud: <mcp-client-id>) for MCP authentication
2. Checks if user has provisioned Nextcloud access (Flow 2)
3. Uses Token Broker to obtain aud: "nextcloud" tokens when needed
"""
def __init__(
self,
token_storage: RefreshTokenStorage | None,
token_broker: Optional[TokenBrokerService] = None,
oidc_discovery_url: Optional[str] = None,
nextcloud_host: Optional[str] = None,
encryption_key: Optional[str] = None,
mcp_client_id: Optional[str] = None,
introspection_uri: Optional[str] = None,
client_secret: Optional[str] = None,
):
"""
Initialize the Progressive Consent token verifier.
Args:
token_storage: Storage for refresh tokens
token_broker: Token broker service (created if not provided)
oidc_discovery_url: OIDC provider discovery URL
nextcloud_host: Nextcloud server URL
encryption_key: Fernet key for token encryption
mcp_client_id: MCP server OAuth client ID for audience validation
introspection_uri: OAuth introspection endpoint URL (for opaque tokens)
client_secret: OAuth client secret (required for introspection)
"""
self.storage = token_storage
self.oidc_discovery_url = oidc_discovery_url or os.getenv(
"OIDC_DISCOVERY_URL",
f"{os.getenv('NEXTCLOUD_HOST')}/.well-known/openid-configuration",
)
self.nextcloud_host = nextcloud_host or os.getenv("NEXTCLOUD_HOST")
self.encryption_key = encryption_key or os.getenv("TOKEN_ENCRYPTION_KEY")
self.mcp_client_id = mcp_client_id or os.getenv("OIDC_CLIENT_ID")
self.introspection_uri = introspection_uri
self.client_secret = client_secret or os.getenv("OIDC_CLIENT_SECRET")
# HTTP client for introspection requests
self._http_client: Optional[httpx.AsyncClient] = None
if self.introspection_uri and self.mcp_client_id and self.client_secret:
self._http_client = httpx.AsyncClient(timeout=10.0)
logger.info(f"Introspection support enabled: {introspection_uri}")
elif self.introspection_uri:
logger.warning(
"Introspection URI provided but missing client credentials - introspection disabled"
)
# Create token broker if not provided
if token_broker:
self.token_broker = token_broker
elif self.encryption_key and token_storage and self.nextcloud_host:
self.token_broker = TokenBrokerService(
storage=token_storage,
oidc_discovery_url=self.oidc_discovery_url,
nextcloud_host=self.nextcloud_host,
encryption_key=self.encryption_key,
)
else:
self.token_broker = None
if not self.encryption_key:
logger.warning("Token broker not available - encryption key missing")
elif not token_storage:
logger.warning("Token broker not available - token storage missing")
elif not self.nextcloud_host:
logger.warning("Token broker not available - nextcloud host missing")
async def verify_token(self, token: str) -> Optional[AccessToken]:
"""
Verify a Flow 1 token (aud: <mcp-client-id>).
This validates that:
1. Token has correct audience for MCP server (matches client ID)
2. Token is not expired
3. Token has valid signature (if verification enabled)
Supports both JWT and opaque tokens:
- JWT tokens: Decoded directly from payload
- Opaque tokens: Validated via introspection endpoint (RFC 7662)
Args:
token: Access token from Flow 1 (JWT or opaque)
Returns:
AccessToken if valid, None otherwise
"""
logger.info("🔐 verify_token called - attempting to validate token")
logger.info(f"Token (first 50 chars): {token[:50]}...")
logger.info(f"Expected MCP client ID: {self.mcp_client_id}")
# Check if token is JWT format (has 3 parts separated by dots)
is_jwt = "." in token and token.count(".") == 2
logger.info(f"Token format: {'JWT' if is_jwt else 'opaque'}")
if is_jwt:
# Try JWT verification
return await self._verify_jwt_token(token)
else:
# Fall back to introspection for opaque tokens
return await self._verify_opaque_token(token)
async def _verify_jwt_token(self, token: str) -> Optional[AccessToken]:
"""Verify JWT token by decoding payload."""
try:
# Decode without signature verification (IdP handles that)
# In production, would verify signature with IdP public key
payload = jwt.decode(token, options={"verify_signature": False})
logger.info(f"Token payload decoded: {payload}")
# CRITICAL: Verify audience is for MCP server (Flow 1)
audiences = payload.get("aud", [])
if isinstance(audiences, str):
audiences = [audiences]
# Audience validation:
# - Accept tokens with no audience (will validate via introspection if needed)
# - Accept tokens with MCP client ID in audience (Keycloak multi-audience)
# - Accept tokens with resource URL in audience (Nextcloud JWT redirect URI)
# - Reject tokens with "nextcloud" audience only (wrong flow)
if audiences:
# Check if MCP client ID is in the audience (Keycloak multi-audience)
if self.mcp_client_id in audiences:
logger.debug(
f"Token has audience {audiences} - MCP client ID present"
)
# Check if this is a Nextcloud-only token (wrong flow)
elif audiences == ["nextcloud"]:
logger.warning(
f"Token rejected: Nextcloud-only audience {audiences}"
)
logger.error(
"Received Nextcloud token in MCP context - "
"client may be using wrong token"
)
return None
# Otherwise accept (likely resource URL audience from Nextcloud JWT)
else:
logger.info(
f"Token has audience {audiences} (resource URL or non-standard) - accepting"
)
else:
logger.info(
"Token has no audience claim - accepting for MCP server validation"
)
# Check expiry
exp = payload.get("exp", 0)
if exp < datetime.now(timezone.utc).timestamp():
logger.warning(
f"❌ Token expired: exp={exp}, now={datetime.now(timezone.utc).timestamp()}"
)
return None
# Extract user info
user_id = payload.get("sub", "unknown")
client_id = payload.get("client_id", "unknown")
scopes = payload.get("scope", "").split()
exp = payload.get("exp", None)
logger.info(
f"✅ Token validation successful! user={user_id}, scopes={scopes}"
)
# Create AccessToken for MCP framework
return AccessToken(
token=token,
client_id=client_id,
scopes=scopes,
expires_at=exp,
resource=user_id, # Store user_id in resource field (RFC 8707)
)
except jwt.InvalidTokenError as e:
logger.warning(f"❌ Invalid token (JWT decode failed): {e}")
return None
except Exception as e:
logger.error(f"❌ Token verification failed with exception: {e}")
return None
async def _verify_opaque_token(self, token: str) -> Optional[AccessToken]:
"""
Verify opaque token via introspection endpoint (RFC 7662).
Args:
token: Opaque access token
Returns:
AccessToken if active and valid, None otherwise
"""
if not self._http_client or not self.introspection_uri:
logger.error(
"❌ Cannot verify opaque token - introspection not configured. "
"Set introspection_uri and client credentials."
)
return None
try:
logger.info(f"Introspecting token at {self.introspection_uri}")
# Call introspection endpoint (requires client authentication)
response = await self._http_client.post(
self.introspection_uri,
data={"token": token},
auth=(self.mcp_client_id, self.client_secret),
)
if response.status_code != 200:
logger.warning(
f"❌ Introspection failed: HTTP {response.status_code} - {response.text[:200]}"
)
return None
introspection_data = response.json()
logger.info(f"Introspection response: {introspection_data}")
# Check if token is active
if not introspection_data.get("active", False):
logger.warning("❌ Token introspection returned active=false")
return None
# Extract user info
user_id = introspection_data.get("sub") or introspection_data.get(
"username"
)
if not user_id:
logger.error("❌ No username found in introspection response")
return None
# Extract scopes (space-separated string)
scope_string = introspection_data.get("scope", "")
scopes = scope_string.split() if scope_string else []
# Extract client ID and expiration
client_id = introspection_data.get("client_id", "unknown")
exp = introspection_data.get("exp")
logger.info(f"✅ Opaque token validated! user={user_id}, scopes={scopes}")
return AccessToken(
token=token,
client_id=client_id,
scopes=scopes,
expires_at=int(exp) if exp else None,
resource=user_id,
)
except httpx.TimeoutException:
logger.error("❌ Timeout while introspecting token")
return None
except httpx.RequestError as e:
logger.error(f"❌ Network error during introspection: {e}")
return None
except Exception as e:
logger.error(f"❌ Introspection failed with exception: {e}")
return None
async def check_provisioning(self, user_id: str) -> bool:
"""
Check if user has provisioned Nextcloud access (Flow 2).
Args:
user_id: User identifier from Flow 1 token
Returns:
True if user has completed Flow 2, False otherwise
"""
if not self.storage:
return False
refresh_data = await self.storage.get_refresh_token(user_id)
return refresh_data is not None
async def get_nextcloud_token(self, user_id: str) -> Optional[str]:
"""
Get a Nextcloud access token (aud: "nextcloud") for the user.
This uses the Token Broker to:
1. Check for cached Nextcloud token
2. If expired, refresh using stored master refresh token
3. Return token with aud: "nextcloud" for API access
Args:
user_id: User identifier from Flow 1 token
Returns:
Nextcloud access token if provisioned, None otherwise
"""
if not self.token_broker:
logger.error("Token broker not available")
return None
# Check if user has provisioned access
if not await self.check_provisioning(user_id):
logger.info(f"User {user_id} has not provisioned Nextcloud access")
return None
# Get or refresh Nextcloud token
try:
nextcloud_token = await self.token_broker.get_nextcloud_token(user_id)
if nextcloud_token:
logger.debug(f"Obtained Nextcloud token for user {user_id}")
return nextcloud_token
except Exception as e:
logger.error(f"Failed to get Nextcloud token: {e}")
return None
async def validate_scopes(
self, token: AccessToken, required_scopes: list[str]
) -> bool:
"""
Validate that token has required scopes.
Args:
token: The access token
required_scopes: List of required scopes
Returns:
True if all required scopes present, False otherwise
"""
token_scopes = set(token.scopes) if token.scopes else set()
required = set(required_scopes)
missing = required - token_scopes
if missing:
logger.debug(f"Token missing required scopes: {missing}")
return False
return True
async def close(self):
"""Clean up resources."""
if self.token_broker:
await self.token_broker.close()
if self._http_client:
await self._http_client.aclose()
nextcloud_mcp_server/auth/token_verifier.py
-492
View File
@@ -1,492 +0,0 @@
"""Token verification using Nextcloud OIDC userinfo endpoint."""
import logging
import time
from typing import Any
import httpx
import jwt
from jwt import PyJWKClient
from mcp.server.auth.provider import AccessToken, TokenVerifier
logger = logging.getLogger(__name__)
class NextcloudTokenVerifier(TokenVerifier):
"""
Validates access tokens using JWT verification with JWKS or userinfo endpoint fallback.
This verifier supports both JWT and opaque tokens:
1. For JWT tokens: Verifies signature with JWKS and extracts scopes from payload
2. For opaque tokens: Falls back to userinfo endpoint validation
3. Caches successful responses to avoid repeated API calls/verifications
JWT validation provides:
- Faster validation (no HTTP call needed)
- Direct scope extraction from token payload
- Signature verification using JWKS
Userinfo fallback provides:
- Support for opaque tokens
- Backward compatibility
- Additional validation layer
"""
def __init__(
self,
nextcloud_host: str,
userinfo_uri: str,
jwks_uri: str | None = None,
issuer: str | None = None,
introspection_uri: str | None = None,
client_id: str | None = None,
client_secret: str | None = None,
cache_ttl: int = 3600,
):
"""
Initialize the token verifier.
Args:
nextcloud_host: Base URL of the Nextcloud instance (e.g., https://cloud.example.com)
userinfo_uri: Full URL to the userinfo endpoint
jwks_uri: Full URL to the JWKS endpoint (for JWT verification)
issuer: Expected issuer claim value (for JWT verification)
introspection_uri: Full URL to the introspection endpoint (for opaque tokens)
client_id: OAuth client ID (required for introspection)
client_secret: OAuth client secret (required for introspection)
cache_ttl: Time-to-live for cached tokens in seconds (default: 3600)
"""
self.nextcloud_host = nextcloud_host.rstrip("/")
self.userinfo_uri = userinfo_uri
self.jwks_uri = jwks_uri
self.issuer = issuer
self.introspection_uri = introspection_uri
self.client_id = client_id
self.client_secret = client_secret
self.cache_ttl = cache_ttl
# Cache: token -> (userinfo, expiry_timestamp)
self._token_cache: dict[str, tuple[dict[str, Any], float]] = {}
# HTTP client for userinfo/introspection requests
self._client = httpx.AsyncClient(timeout=10.0)
# PyJWKClient for JWT verification (lazy initialization)
self._jwks_client: PyJWKClient | None = None
if jwks_uri:
logger.info(f"JWT verification enabled with JWKS URI: {jwks_uri}")
self._jwks_client = PyJWKClient(jwks_uri, cache_keys=True)
# Introspection support
if introspection_uri and client_id and client_secret:
logger.info(f"Token introspection enabled: {introspection_uri}")
elif introspection_uri:
logger.warning(
"Introspection URI provided but missing client credentials - introspection disabled"
)
async def verify_token(self, token: str) -> AccessToken | None:
"""
Verify a bearer token using JWT verification, introspection, or userinfo endpoint.
This method:
1. Checks the cache first for recent validations
2. Attempts JWT verification if JWKS is configured and token looks like JWT
3. Falls back to introspection for opaque tokens (if configured)
4. Falls back to userinfo endpoint as last resort
5. Returns AccessToken with username and scopes
Args:
token: The bearer token to verify
Returns:
AccessToken if valid, None if invalid or expired
"""
# Check cache first
cached = self._get_cached_token(token)
if cached:
logger.debug("Token found in cache")
return cached
# Try JWT verification first if enabled and token looks like JWT
is_jwt_format = self._is_jwt_format(token)
logger.debug(
f"Token format check: is_jwt_format={is_jwt_format}, _jwks_client={self._jwks_client is not None}"
)
if self._jwks_client and is_jwt_format:
logger.debug("Attempting JWT verification...")
jwt_result = self._verify_jwt(token)
if jwt_result:
logger.info("Token validated via JWT verification")
return jwt_result
else:
logger.warning("JWT verification failed, will try other methods")
# For opaque tokens, try introspection if available
if self.introspection_uri and self.client_id and self.client_secret:
logger.debug("Attempting token introspection...")
try:
introspection_result = await self._verify_via_introspection(token)
if introspection_result:
logger.info("Token validated via introspection")
return introspection_result
except Exception as e:
logger.warning(f"Introspection failed: {e}")
# Fall back to userinfo endpoint validation (last resort)
logger.debug("Attempting userinfo endpoint validation...")
try:
return await self._verify_via_userinfo(token)
except Exception as e:
logger.warning(f"Token verification failed: {e}")
return None
def _is_jwt_format(self, token: str) -> bool:
"""
Check if token looks like a JWT (has 3 parts separated by dots).
Args:
token: The token to check
Returns:
True if token appears to be JWT format
"""
return "." in token and token.count(".") == 2
def _verify_jwt(self, token: str) -> AccessToken | None:
"""
Verify JWT token with signature validation using JWKS.
Args:
token: The JWT token to verify
Returns:
AccessToken if valid, None if invalid
"""
try:
# Get signing key from JWKS
assert self._jwks_client is not None # Caller should check before calling
signing_key = self._jwks_client.get_signing_key_from_jwt(token)
# Verify and decode JWT
# Accept tokens with audience: "mcp-server" or ["mcp-server", "nextcloud"]
# This allows:
# 1. Tokens from MCP clients (aud: "mcp-server")
# 2. Tokens for Nextcloud APIs (aud: "nextcloud")
# 3. Tokens for both (aud: ["mcp-server", "nextcloud"])
payload = jwt.decode(
token,
signing_key.key,
algorithms=["RS256"],
issuer=self.issuer,
audience=["mcp-server", "nextcloud"], # Accept either audience
options={
"verify_signature": True,
"verify_exp": True,
"verify_iat": True,
"verify_iss": True if self.issuer else False,
"verify_aud": True, # Enable audience validation
},
)
logger.debug(f"JWT verified successfully for user: {payload.get('sub')}")
logger.debug(f"Full JWT payload: {payload}")
# Extract username (sub claim, with fallback to preferred_username)
# Some OIDC providers (like Keycloak) may not include sub in access tokens
username = payload.get("sub") or payload.get("preferred_username")
if not username:
logger.error(
"No 'sub' or 'preferred_username' claim found in JWT payload"
)
return None
# Extract scopes from scope claim (space-separated string)
scope_string = payload.get("scope", "")
scopes = scope_string.split() if scope_string else []
logger.debug(
f"Extracted scopes from JWT - scope claim: '{scope_string}' -> scopes list: {scopes}"
)
# Extract expiration
exp = payload.get("exp")
if not exp:
logger.warning("No 'exp' claim in JWT, using default TTL")
exp = int(time.time() + self.cache_ttl)
# Cache the result
userinfo = {
"sub": username,
"scope": scope_string,
**{k: v for k, v in payload.items() if k not in ["sub", "scope"]},
}
self._token_cache[token] = (userinfo, exp)
return AccessToken(
token=token,
client_id=payload.get("client_id", ""),
scopes=scopes,
expires_at=exp,
resource=username, # Store username in resource field (RFC 8707)
)
except jwt.ExpiredSignatureError:
logger.info("JWT token has expired")
return None
except jwt.InvalidIssuerError as e:
logger.warning(f"JWT issuer validation failed: {e}")
return None
except jwt.InvalidTokenError as e:
logger.warning(f"JWT validation failed: {e}")
return None
except Exception as e:
logger.error(f"Unexpected error during JWT verification: {e}")
return None
async def _verify_via_introspection(self, token: str) -> AccessToken | None:
"""
Validate token by calling the introspection endpoint (RFC 7662).
This method validates opaque tokens and retrieves their scopes.
Args:
token: The bearer token to introspect
Returns:
AccessToken if active, None if inactive or invalid
"""
try:
# Introspection requires client authentication
response = await self._client.post(
self.introspection_uri, # type: ignore
data={"token": token},
auth=(self.client_id, self.client_secret),
)
if response.status_code == 200:
introspection_data = response.json()
# Check if token is active
if not introspection_data.get("active", False):
logger.info("Token introspection returned inactive=false")
return None
logger.debug(
f"Token introspected successfully for user: {introspection_data.get('sub')}"
)
# Extract username
username = introspection_data.get("sub") or introspection_data.get(
"username"
)
if not username:
logger.error("No username found in introspection response")
return None
# Extract scopes (space-separated string)
scope_string = introspection_data.get("scope", "")
scopes = scope_string.split() if scope_string else []
logger.debug(f"Extracted scopes from introspection: {scopes}")
# Extract expiration
exp = introspection_data.get("exp")
if exp:
expiry = float(exp)
else:
logger.warning(
"No 'exp' in introspection response, using default TTL"
)
expiry = time.time() + self.cache_ttl
# Cache the result
cache_data = {
"sub": username,
"scope": scope_string,
**{
k: v
for k, v in introspection_data.items()
if k not in ["sub", "scope", "active"]
},
}
self._token_cache[token] = (cache_data, expiry)
return AccessToken(
token=token,
client_id=introspection_data.get("client_id", ""),
scopes=scopes,
expires_at=int(expiry),
resource=username,
)
elif response.status_code in (400, 401, 403):
logger.warning(
f"Token introspection failed: HTTP {response.status_code}. "
f"This may indicate: (1) Client credentials mismatch - trying to introspect "
f"token issued to different OAuth client, (2) Expired client credentials, "
f"(3) Invalid token. Will fall back to userinfo endpoint. "
f"Response: {response.text[:200] if response.text else 'empty'}"
)
return None
else:
logger.warning(
f"Unexpected response from introspection: {response.status_code}. "
f"Response: {response.text[:200] if response.text else 'empty'}"
)
return None
except httpx.TimeoutException:
logger.error("Timeout while introspecting token")
return None
except httpx.RequestError as e:
logger.error(f"Network error while introspecting token: {e}")
return None
except Exception as e:
logger.error(f"Unexpected error during token introspection: {e}")
return None
async def _verify_via_userinfo(self, token: str) -> AccessToken | None:
"""
Validate token by calling the userinfo endpoint.
Args:
token: The bearer token to verify
Returns:
AccessToken if valid, None otherwise
"""
try:
response = await self._client.get(
self.userinfo_uri, headers={"Authorization": f"Bearer {token}"}
)
if response.status_code == 200:
userinfo = response.json()
logger.debug(
f"Token validated successfully for user: {userinfo.get('sub')}"
)
# Cache the result
expiry = time.time() + self.cache_ttl
self._token_cache[token] = (userinfo, expiry)
# Create AccessToken with username in resource field (workaround for MCP SDK)
username = userinfo.get("sub") or userinfo.get("preferred_username")
if not username:
logger.error("No username found in userinfo response")
return None
return AccessToken(
token=token,
client_id="", # Not available from userinfo
scopes=self._extract_scopes(userinfo),
expires_at=int(expiry),
resource=username, # Store username in resource field (RFC 8707)
)
elif response.status_code in (400, 401, 403):
logger.info(f"Token validation failed: HTTP {response.status_code}")
return None
else:
logger.warning(
f"Unexpected response from userinfo: {response.status_code}"
)
return None
except httpx.TimeoutException:
logger.error("Timeout while validating token via userinfo endpoint")
return None
except httpx.RequestError as e:
logger.error(f"Network error while validating token: {e}")
return None
except Exception as e:
logger.error(f"Unexpected error during token validation: {e}")
return None
def _get_cached_token(self, token: str) -> AccessToken | None:
"""
Retrieve a token from cache if not expired.
Args:
token: The bearer token to look up
Returns:
AccessToken if cached and valid, None otherwise
"""
if token not in self._token_cache:
return None
userinfo, expiry = self._token_cache[token]
# Check if expired
if time.time() >= expiry:
logger.debug("Cached token expired, removing from cache")
del self._token_cache[token]
return None
# Return cached AccessToken
username = userinfo.get("sub") or userinfo.get("preferred_username")
return AccessToken(
token=token,
client_id="",
scopes=self._extract_scopes(userinfo),
expires_at=int(expiry),
resource=username,
)
def _extract_scopes(self, userinfo: dict[str, Any]) -> list[str]:
"""
Extract scopes from userinfo response.
First attempts to read actual scopes from the 'scope' field (RFC 8693).
If not present, infers scopes from the claims present in the response.
Args:
userinfo: The userinfo response dictionary
Returns:
List of scopes (actual or inferred)
"""
# Try to get actual scopes from userinfo response (if OIDC provider includes it)
scope_string = userinfo.get("scope")
if scope_string:
scopes = scope_string.split() if isinstance(scope_string, str) else []
if scopes:
logger.debug(
f"Using actual scopes from userinfo: {scopes} (scope field present)"
)
return scopes
# Fallback: Infer scopes from claims present in response
# This maintains backward compatibility with OIDC providers that don't
# include the scope field in userinfo responses
logger.debug(
"No scope field in userinfo response, inferring scopes from claims"
)
scopes = ["openid"] # Always present
if "email" in userinfo:
scopes.append("email")
if any(
key in userinfo for key in ["name", "given_name", "family_name", "picture"]
):
scopes.append("profile")
if "roles" in userinfo:
scopes.append("roles")
if "groups" in userinfo:
scopes.append("groups")
logger.debug(f"Inferred scopes from userinfo claims: {scopes}")
return scopes
def clear_cache(self):
"""Clear the token cache."""
self._token_cache.clear()
logger.debug("Token cache cleared")
async def close(self):
"""Cleanup resources."""
await self._client.aclose()
logger.debug("Token verifier closed")
nextcloud_mcp_server/auth/unified_verifier.py
+475
View File
@@ -0,0 +1,475 @@
"""
Unified Token Verifier for ADR-005 Token Audience Validation.
This module replaces both NextcloudTokenVerifier and ProgressiveConsentTokenVerifier
with a single implementation that supports two compliant OAuth modes:
1. Multi-audience mode (default): Tokens must contain BOTH MCP and Nextcloud audiences
2. Token exchange mode (opt-in): Tokens have MCP audience only, exchanged for Nextcloud tokens
Key Design Principles:
- Token verification happens HERE (validates audiences)
- Token exchange happens in context_helper.py (when creating NextcloudClient)
- No token passthrough allowed (complies with MCP Security Specification)
"""
import hashlib
import logging
import time
from typing import Any
import httpx
import jwt
from jwt import PyJWKClient
from mcp.server.auth.provider import AccessToken, TokenVerifier
from nextcloud_mcp_server.config import Settings
logger = logging.getLogger(__name__)
class UnifiedTokenVerifier(TokenVerifier):
"""
Unified token verifier supporting both multi-audience and token exchange modes.
Compliant with MCP security specification - no token pass-through.
This verifier:
1. Validates tokens using JWT verification with JWKS or introspection fallback
2. Enforces proper audience validation based on configured mode
3. Caches successful validations to avoid repeated API calls
Mode Selection (via ENABLE_TOKEN_EXCHANGE setting):
- False/omit (default): Multi-audience mode - requires BOTH MCP and Nextcloud audiences
- True: Exchange mode - requires MCP audience only (exchange happens later)
"""
def __init__(self, settings: Settings):
"""
Initialize the unified token verifier.
Args:
settings: Application settings containing OAuth configuration
"""
self.settings = settings
self.mode = "exchange" if settings.enable_token_exchange else "multi-audience"
# Common components for all modes
self.http_client = httpx.AsyncClient(timeout=10.0)
# JWT verification support
self.jwks_client: PyJWKClient | None = None
if hasattr(settings, "jwks_uri") and settings.jwks_uri:
logger.info(f"JWT verification enabled with JWKS URI: {settings.jwks_uri}")
self.jwks_client = PyJWKClient(settings.jwks_uri, cache_keys=True)
# Introspection support (for opaque tokens)
self.introspection_uri: str | None = None
if (
hasattr(settings, "introspection_uri")
and settings.introspection_uri
and settings.oidc_client_id
and settings.oidc_client_secret
):
self.introspection_uri = settings.introspection_uri
logger.info(f"Token introspection enabled: {self.introspection_uri}")
# Token cache: token_hash -> (userinfo, expiry_timestamp)
self._token_cache: dict[str, tuple[dict[str, Any], float]] = {}
self.cache_ttl = 3600 # 1 hour default
logger.info(
f"UnifiedTokenVerifier initialized in {self.mode} mode. "
f"MCP audience: {settings.oidc_client_id} or {settings.nextcloud_mcp_server_url}, "
f"Nextcloud resource URI: {settings.nextcloud_resource_uri}"
)
async def verify_token(self, token: str) -> AccessToken | None:
"""
Verify token according to MCP TokenVerifier protocol.
CRITICAL: This method only validates tokens - it does NOT perform exchange.
Token exchange happens later in context_helper.py when creating NextcloudClient.
Multi-audience mode: Validates token has BOTH MCP and Nextcloud audiences
Exchange mode: Validates token has MCP audience ONLY (exchange happens later)
Args:
token: Bearer token to verify
Returns:
AccessToken if valid, None if invalid or expired
"""
# Check cache first
cached = self._get_cached_token(token)
if cached:
logger.debug("Token found in cache")
return cached
# Verify based on mode
if self.mode == "multi-audience":
return await self._verify_multi_audience_token(token)
else:
# Exchange mode: Only validate MCP audience here
# Actual exchange happens in context_helper.py
return await self._verify_mcp_audience_only(token)
async def _verify_multi_audience_token(self, token: str) -> AccessToken | None:
"""
Validate token has both MCP and Nextcloud audiences (Mode 1).
Token can be used directly without exchange.
Args:
token: Bearer token to verify
Returns:
AccessToken if valid with both audiences, None otherwise
"""
try:
# Attempt JWT verification first
if self._is_jwt_format(token) and self.jwks_client:
payload = await self._verify_jwt_signature(token)
else:
# Fall back to introspection for opaque tokens
payload = await self._introspect_token(token)
if not payload:
return None
# Check payload is valid
if not payload:
return None
# Validate both audiences are present
if not self._validate_multi_audience(payload):
audiences = payload.get("aud", [])
logger.error(
f"Token rejected: Missing required audiences. "
f"Got {audiences}, need both MCP ({self.settings.oidc_client_id} or "
f"{self.settings.nextcloud_mcp_server_url}) AND Nextcloud "
f"({self.settings.nextcloud_resource_uri})"
)
return None
logger.info(
"Multi-audience validation passed - token has both MCP and Nextcloud audiences"
)
return self._create_access_token(token, payload)
except Exception as e:
logger.error(f"Multi-audience validation failed: {e}")
return None
async def _verify_mcp_audience_only(self, token: str) -> AccessToken | None:
"""
Validate token has MCP audience only (Mode 2).
Token will be exchanged later in context_helper.py.
Args:
token: Bearer token to verify
Returns:
AccessToken if valid with MCP audience, None otherwise
"""
try:
# Attempt JWT verification first
if self._is_jwt_format(token) and self.jwks_client:
payload = await self._verify_jwt_signature(token)
else:
# Fall back to introspection for opaque tokens
payload = await self._introspect_token(token)
if not payload:
return None
# Check payload is valid
if not payload:
return None
# Only validate MCP audience (exchange will handle Nextcloud)
if not self._has_mcp_audience(payload):
audiences = payload.get("aud", [])
logger.error(
f"Token rejected: Missing MCP audience. "
f"Got {audiences}, need {self.settings.oidc_client_id} "
f"or {self.settings.nextcloud_mcp_server_url}"
)
return None
logger.info(
"MCP audience validation passed - token will be exchanged for Nextcloud access"
)
return self._create_access_token(token, payload)
except Exception as e:
logger.error(f"MCP audience validation failed: {e}")
return None
def _validate_multi_audience(self, payload: dict[str, Any]) -> bool:
"""
Check if token has both MCP and Nextcloud audiences.
Args:
payload: Decoded token payload
Returns:
True if both audiences present, False otherwise
"""
audiences = payload.get("aud", [])
if isinstance(audiences, str):
audiences = [audiences]
audiences_set = set(audiences)
# MCP must have at least one: client_id OR server_url
mcp_valid = self.settings.oidc_client_id in audiences_set or (
self.settings.nextcloud_mcp_server_url
and self.settings.nextcloud_mcp_server_url in audiences_set
)
# Nextcloud must have its resource URI
nextcloud_valid = bool(
self.settings.nextcloud_resource_uri
and self.settings.nextcloud_resource_uri in audiences_set
)
return bool(mcp_valid and nextcloud_valid)
def _has_mcp_audience(self, payload: dict[str, Any]) -> bool:
"""
Check if token has MCP audience (for exchange mode).
Args:
payload: Decoded token payload
Returns:
True if MCP audience present, False otherwise
"""
audiences = payload.get("aud", [])
if isinstance(audiences, str):
audiences = [audiences]
audiences_set = set(audiences)
return bool(
self.settings.oidc_client_id in audiences_set
or (
self.settings.nextcloud_mcp_server_url
and self.settings.nextcloud_mcp_server_url in audiences_set
)
)
def _is_jwt_format(self, token: str) -> bool:
"""
Check if token looks like a JWT (has 3 parts separated by dots).
Args:
token: The token to check
Returns:
True if token appears to be JWT format
"""
return "." in token and token.count(".") == 2
async def _verify_jwt_signature(self, token: str) -> dict[str, Any] | None:
"""
Verify JWT token with signature validation using JWKS.
Args:
token: JWT token to verify
Returns:
Decoded payload if valid, None if invalid
"""
try:
assert self.jwks_client is not None # Caller should check before calling
# Get signing key from JWKS
signing_key = self.jwks_client.get_signing_key_from_jwt(token)
# Verify and decode JWT
# Note: We don't validate audience here - that's done separately based on mode
payload = jwt.decode(
token,
signing_key.key,
algorithms=["RS256"],
issuer=self.settings.oidc_issuer
if hasattr(self.settings, "oidc_issuer")
else None,
options={
"verify_signature": True,
"verify_exp": True,
"verify_iat": True,
"verify_iss": True
if hasattr(self.settings, "oidc_issuer")
and self.settings.oidc_issuer
else False,
"verify_aud": False, # We handle audience validation separately
},
)
logger.debug(f"JWT signature verified for user: {payload.get('sub')}")
return payload
except jwt.ExpiredSignatureError:
logger.info("JWT token has expired")
return None
except jwt.InvalidIssuerError as e:
logger.warning(f"JWT issuer validation failed: {e}")
return None
except jwt.InvalidTokenError as e:
logger.warning(f"JWT validation failed: {e}")
return None
except Exception as e:
logger.error(f"Unexpected error during JWT verification: {e}")
return None
async def _introspect_token(self, token: str) -> dict[str, Any] | None:
"""
Validate token by calling the introspection endpoint (RFC 7662).
Args:
token: Bearer token to introspect
Returns:
Token payload if active, None if inactive or invalid
"""
if not self.introspection_uri:
logger.debug("No introspection endpoint configured")
return None
try:
# Introspection requires client authentication
response = await self.http_client.post(
self.introspection_uri,
data={"token": token},
auth=(self.settings.oidc_client_id, self.settings.oidc_client_secret),
)
if response.status_code == 200:
introspection_data = response.json()
# Check if token is active
if not introspection_data.get("active", False):
logger.info("Token introspection returned inactive=false")
return None
logger.debug(
f"Token introspected successfully for user: {introspection_data.get('sub')}"
)
return introspection_data
elif response.status_code in (400, 401, 403):
logger.warning(
f"Token introspection failed: HTTP {response.status_code}. "
f"Response: {response.text[:200] if response.text else 'empty'}"
)
return None
else:
logger.warning(
f"Unexpected response from introspection: {response.status_code}. "
f"Response: {response.text[:200] if response.text else 'empty'}"
)
return None
except httpx.TimeoutException:
logger.error("Timeout while introspecting token")
return None
except httpx.RequestError as e:
logger.error(f"Network error while introspecting token: {e}")
return None
except Exception as e:
logger.error(f"Unexpected error during token introspection: {e}")
return None
def _create_access_token(
self, token: str, payload: dict[str, Any]
) -> AccessToken | None:
"""
Create AccessToken object from validated token payload.
Args:
token: The bearer token
payload: Validated token payload
Returns:
AccessToken object or None if required fields missing
"""
# Extract username (sub claim, with fallback to preferred_username)
username = payload.get("sub") or payload.get("preferred_username")
if not username:
logger.error(
"No 'sub' or 'preferred_username' claim found in token payload"
)
return None
# Extract scopes from scope claim (space-separated string)
scope_string = payload.get("scope", "")
scopes = scope_string.split() if scope_string else []
logger.debug(
f"Extracted scopes from token - scope claim: '{scope_string}' -> scopes list: {scopes}"
)
# Extract expiration
exp = payload.get("exp")
if not exp:
logger.warning("No 'exp' claim in token, using default TTL")
exp = int(time.time() + self.cache_ttl)
# Cache the result
token_hash = hashlib.sha256(token.encode()).hexdigest()
userinfo = {
"sub": username,
"scope": scope_string,
**{k: v for k, v in payload.items() if k not in ["sub", "scope"]},
}
self._token_cache[token_hash] = (userinfo, exp)
return AccessToken(
token=token,
client_id=payload.get("client_id", ""),
scopes=scopes,
expires_at=exp,
resource=username, # Store username in resource field (RFC 8707)
)
def _get_cached_token(self, token: str) -> AccessToken | None:
"""
Retrieve a token from cache if not expired.
Args:
token: The bearer token to look up
Returns:
AccessToken if cached and valid, None otherwise
"""
token_hash = hashlib.sha256(token.encode()).hexdigest()
if token_hash not in self._token_cache:
return None
userinfo, expiry = self._token_cache[token_hash]
# Check if expired
if time.time() >= expiry:
logger.debug("Cached token expired, removing from cache")
del self._token_cache[token_hash]
return None
# Return cached AccessToken
username = userinfo.get("sub") or userinfo.get("preferred_username")
scope_string = userinfo.get("scope", "")
scopes = scope_string.split() if scope_string else []
return AccessToken(
token=token,
client_id=userinfo.get("client_id", ""),
scopes=scopes,
expires_at=int(expiry),
resource=username,
)
def clear_cache(self):
"""Clear the token cache."""
self._token_cache.clear()
logger.debug("Token cache cleared")
async def close(self):
"""Cleanup resources."""
await self.http_client.aclose()
logger.debug("Unified token verifier closed")
nextcloud_mcp_server/config.py
+23
View File
@@ -129,16 +129,29 @@ class Settings:
oidc_discovery_url: Optional[str] = None
oidc_client_id: Optional[str] = None
oidc_client_secret: Optional[str] = None
oidc_issuer: Optional[str] = None
# Nextcloud settings
nextcloud_host: Optional[str] = None
nextcloud_username: Optional[str] = None
nextcloud_password: Optional[str] = None
# ADR-005: Token Audience Validation (required for OAuth mode)
nextcloud_mcp_server_url: Optional[str] = None # MCP server URL (used as audience)
nextcloud_resource_uri: Optional[str] = None # Nextcloud resource identifier
# Token verification endpoints
jwks_uri: Optional[str] = None
introspection_uri: Optional[str] = None
userinfo_uri: Optional[str] = None
# Progressive Consent settings (always enabled - no flag needed)
enable_token_exchange: bool = False
enable_offline_access: bool = False
# Token exchange cache settings
token_exchange_cache_ttl: int = 300 # seconds (5 minutes default)
# Token settings
token_encryption_key: Optional[str] = None
token_storage_db: Optional[str] = None
@@ -155,10 +168,18 @@ def get_settings() -> Settings:
oidc_discovery_url=os.getenv("OIDC_DISCOVERY_URL"),
oidc_client_id=os.getenv("OIDC_CLIENT_ID"),
oidc_client_secret=os.getenv("OIDC_CLIENT_SECRET"),
oidc_issuer=os.getenv("OIDC_ISSUER"),
# Nextcloud settings
nextcloud_host=os.getenv("NEXTCLOUD_HOST"),
nextcloud_username=os.getenv("NEXTCLOUD_USERNAME"),
nextcloud_password=os.getenv("NEXTCLOUD_PASSWORD"),
# ADR-005: Token Audience Validation
nextcloud_mcp_server_url=os.getenv("NEXTCLOUD_MCP_SERVER_URL"),
nextcloud_resource_uri=os.getenv("NEXTCLOUD_RESOURCE_URI"),
# Token verification endpoints
jwks_uri=os.getenv("JWKS_URI"),
introspection_uri=os.getenv("INTROSPECTION_URI"),
userinfo_uri=os.getenv("USERINFO_URI"),
# Progressive Consent settings (always enabled)
enable_token_exchange=(
os.getenv("ENABLE_TOKEN_EXCHANGE", "false").lower() == "true"
@@ -166,6 +187,8 @@ def get_settings() -> Settings:
enable_offline_access=(
os.getenv("ENABLE_OFFLINE_ACCESS", "false").lower() == "true"
),
# Token exchange cache settings
token_exchange_cache_ttl=int(os.getenv("TOKEN_EXCHANGE_CACHE_TTL", "300")),
# Token settings
token_encryption_key=os.getenv("TOKEN_ENCRYPTION_KEY"),
token_storage_db=os.getenv("TOKEN_STORAGE_DB", "/tmp/tokens.db"),
nextcloud_mcp_server/context.py
+18 -14
View File
@@ -10,12 +10,15 @@ async def get_client(ctx: Context) -> NextcloudClient:
"""
Get the appropriate Nextcloud client based on authentication mode.
This function handles three modes:
ADR-005 compliant implementation supporting two modes:
1. BasicAuth mode: Returns shared client from lifespan context
2. OAuth pass-through mode (ENABLE_TOKEN_EXCHANGE=false, default):
Verifies Flow 1 token and passes it to Nextcloud
3. OAuth token exchange mode (ENABLE_TOKEN_EXCHANGE=true):
Exchanges Flow 1 token for ephemeral Nextcloud token via RFC 8693
2. Multi-audience mode (ENABLE_TOKEN_EXCHANGE=false, default):
Token already contains both MCP and Nextcloud audiences - use directly
3. Token exchange mode (ENABLE_TOKEN_EXCHANGE=true):
Exchange MCP token for Nextcloud token via RFC 8693
SECURITY: Token passthrough has been REMOVED. All OAuth modes validate
proper token audiences per MCP Security Best Practices specification.
Note: Nextcloud doesn't support OAuth scopes natively. Scopes are enforced
by the MCP server via @require_scopes decorator, not by the IdP.
@@ -49,20 +52,21 @@ async def get_client(ctx: Context) -> NextcloudClient:
# OAuth mode (has 'nextcloud_host' attribute)
if hasattr(lifespan_ctx, "nextcloud_host"):
# Check if token exchange is enabled
if settings.enable_token_exchange:
from nextcloud_mcp_server.auth.context_helper import (
get_session_client_from_context,
)
from nextcloud_mcp_server.auth.context_helper import (
get_client_from_context,
get_session_client_from_context,
)
# Token exchange mode: Exchange Flow 1 token for ephemeral Nextcloud token
if settings.enable_token_exchange:
# Mode 2: Exchange MCP token for Nextcloud token
# Token was validated to have MCP audience in UnifiedTokenVerifier
# Now exchange it for Nextcloud audience
return await get_session_client_from_context(
ctx, lifespan_ctx.nextcloud_host
)
else:
# Pass-through mode (default): Verify and pass Flow 1 token to Nextcloud
from nextcloud_mcp_server.auth import get_client_from_context
# Mode 1: Multi-audience token - use directly
# Token was validated to have BOTH audiences in UnifiedTokenVerifier
return get_client_from_context(ctx, lifespan_ctx.nextcloud_host)
# Unknown context type
tests/unit/test_unified_verifier.py
+518
View File
@@ -0,0 +1,518 @@
"""
Unit tests for UnifiedTokenVerifier (ADR-005).
Tests token audience validation for both multi-audience and token exchange modes
without requiring real network calls or IdP connections.
"""
import time
from unittest.mock import AsyncMock, MagicMock, patch
import jwt
import pytest
from nextcloud_mcp_server.auth.unified_verifier import UnifiedTokenVerifier
from nextcloud_mcp_server.config import Settings
pytestmark = pytest.mark.unit
@pytest.fixture
def base_settings():
"""Create base settings for testing."""
return Settings(
oidc_client_id="test-client-id",
oidc_client_secret="test-client-secret",
oidc_issuer="https://idp.example.com",
nextcloud_host="https://nextcloud.example.com",
nextcloud_mcp_server_url="http://localhost:8000",
nextcloud_resource_uri="http://localhost:8080",
jwks_uri="https://idp.example.com/jwks",
introspection_uri="https://idp.example.com/introspect",
enable_token_exchange=False, # Multi-audience mode
token_exchange_cache_ttl=300,
)
@pytest.fixture
def exchange_settings(base_settings):
"""Create settings for token exchange mode."""
base_settings.enable_token_exchange = True
return base_settings
class TestUnifiedTokenVerifierInit:
"""Test UnifiedTokenVerifier initialization."""
def test_init_multi_audience_mode(self, base_settings):
"""Test verifier initialization in multi-audience mode."""
verifier = UnifiedTokenVerifier(base_settings)
assert verifier.mode == "multi-audience"
assert verifier.settings == base_settings
def test_init_exchange_mode(self, exchange_settings):
"""Test verifier initialization in token exchange mode."""
verifier = UnifiedTokenVerifier(exchange_settings)
assert verifier.mode == "exchange"
assert verifier.settings == exchange_settings
class TestAudienceValidation:
"""Test audience validation logic."""
def test_validate_multi_audience_both_present(self, base_settings):
"""Test multi-audience validation with both audiences present."""
verifier = UnifiedTokenVerifier(base_settings)
payload = {
"aud": ["test-client-id", "http://localhost:8080"],
"sub": "testuser",
"exp": int(time.time() + 3600),
}
assert verifier._validate_multi_audience(payload) is True
def test_validate_multi_audience_server_url_and_resource(self, base_settings):
"""Test multi-audience validation with server URL instead of client ID."""
verifier = UnifiedTokenVerifier(base_settings)
payload = {
"aud": ["http://localhost:8000", "http://localhost:8080"],
"sub": "testuser",
"exp": int(time.time() + 3600),
}
assert verifier._validate_multi_audience(payload) is True
def test_validate_multi_audience_missing_mcp(self, base_settings):
"""Test multi-audience validation fails without MCP audience."""
verifier = UnifiedTokenVerifier(base_settings)
payload = {
"aud": ["http://localhost:8080"], # Only Nextcloud
"sub": "testuser",
"exp": int(time.time() + 3600),
}
assert verifier._validate_multi_audience(payload) is False
def test_validate_multi_audience_missing_nextcloud(self, base_settings):
"""Test multi-audience validation fails without Nextcloud audience."""
verifier = UnifiedTokenVerifier(base_settings)
payload = {
"aud": ["test-client-id"], # Only MCP
"sub": "testuser",
"exp": int(time.time() + 3600),
}
assert verifier._validate_multi_audience(payload) is False
def test_validate_multi_audience_string_audience(self, base_settings):
"""Test multi-audience validation with string audience (should still work)."""
verifier = UnifiedTokenVerifier(base_settings)
payload = {
"aud": "test-client-id", # Single audience as string
"sub": "testuser",
"exp": int(time.time() + 3600),
}
# Should fail - needs both audiences
assert verifier._validate_multi_audience(payload) is False
def test_has_mcp_audience_with_client_id(self, exchange_settings):
"""Test MCP audience validation with client ID."""
verifier = UnifiedTokenVerifier(exchange_settings)
payload = {
"aud": ["test-client-id"],
"sub": "testuser",
"exp": int(time.time() + 3600),
}
assert verifier._has_mcp_audience(payload) is True
def test_has_mcp_audience_with_server_url(self, exchange_settings):
"""Test MCP audience validation with server URL."""
verifier = UnifiedTokenVerifier(exchange_settings)
payload = {
"aud": ["http://localhost:8000"],
"sub": "testuser",
"exp": int(time.time() + 3600),
}
assert verifier._has_mcp_audience(payload) is True
def test_has_mcp_audience_missing(self, exchange_settings):
"""Test MCP audience validation fails without MCP audience."""
verifier = UnifiedTokenVerifier(exchange_settings)
payload = {
"aud": ["http://localhost:8080"], # Wrong audience
"sub": "testuser",
"exp": int(time.time() + 3600),
}
assert verifier._has_mcp_audience(payload) is False
class TestTokenFormatDetection:
"""Test JWT format detection."""
def test_is_jwt_format_valid(self, base_settings):
"""Test JWT format detection with valid JWT."""
verifier = UnifiedTokenVerifier(base_settings)
jwt_token = "eyJhbGc.eyJzdWI.signature"
assert verifier._is_jwt_format(jwt_token) is True
def test_is_jwt_format_opaque(self, base_settings):
"""Test JWT format detection with opaque token."""
verifier = UnifiedTokenVerifier(base_settings)
opaque_token = "opaque-token-12345"
assert verifier._is_jwt_format(opaque_token) is False
class TestTokenCaching:
"""Test token caching functionality."""
async def test_cache_stores_and_retrieves(self, base_settings):
"""Test token caching stores and retrieves tokens."""
verifier = UnifiedTokenVerifier(base_settings)
# Create a valid access token
payload = {
"aud": ["test-client-id", "http://localhost:8080"],
"sub": "testuser",
"scope": "openid profile",
"exp": int(time.time() + 3600),
"client_id": "test-client-id",
}
test_token = jwt.encode(payload, "secret", algorithm="HS256")
# Create AccessToken and cache it
access_token = verifier._create_access_token(test_token, payload)
assert access_token is not None
# Should retrieve from cache
cached = verifier._get_cached_token(test_token)
assert cached is not None
assert cached.resource == "testuser"
assert cached.scopes == ["openid", "profile"]
async def test_cache_respects_expiry(self, base_settings):
"""Test that expired tokens are not returned from cache."""
verifier = UnifiedTokenVerifier(base_settings)
# Create expired token payload
payload = {
"aud": ["test-client-id", "http://localhost:8080"],
"sub": "testuser",
"scope": "openid profile",
"exp": int(time.time() - 100), # Expired 100 seconds ago
"client_id": "test-client-id",
}
test_token = jwt.encode(payload, "secret", algorithm="HS256")
# Create and cache
access_token = verifier._create_access_token(test_token, payload)
assert access_token is not None
# Should not retrieve expired token
cached = verifier._get_cached_token(test_token)
assert cached is None
async def test_cache_clear(self, base_settings):
"""Test cache clearing."""
verifier = UnifiedTokenVerifier(base_settings)
# Create and cache token
payload = {
"aud": ["test-client-id", "http://localhost:8080"],
"sub": "testuser",
"exp": int(time.time() + 3600),
}
test_token = jwt.encode(payload, "secret", algorithm="HS256")
verifier._create_access_token(test_token, payload)
# Clear cache
verifier.clear_cache()
# Should not retrieve after clear
cached = verifier._get_cached_token(test_token)
assert cached is None
class TestMultiAudienceVerification:
"""Test multi-audience token verification."""
async def test_verify_multi_audience_with_introspection(self, base_settings):
"""Test multi-audience verification using introspection."""
verifier = UnifiedTokenVerifier(base_settings)
# Mock introspection response
introspection_response = {
"active": True,
"sub": "testuser",
"aud": ["test-client-id", "http://localhost:8080"],
"scope": "openid profile",
"exp": int(time.time() + 3600),
"client_id": "test-client-id",
}
with patch.object(
verifier, "_introspect_token", return_value=introspection_response
):
opaque_token = "opaque-token-12345"
result = await verifier._verify_multi_audience_token(opaque_token)
assert result is not None
assert result.resource == "testuser"
assert result.scopes == ["openid", "profile"]
async def test_verify_multi_audience_fails_without_both_audiences(
self, base_settings
):
"""Test multi-audience verification fails without both audiences."""
verifier = UnifiedTokenVerifier(base_settings)
# Mock introspection response with only one audience
introspection_response = {
"active": True,
"sub": "testuser",
"aud": ["test-client-id"], # Missing Nextcloud audience
"scope": "openid profile",
"exp": int(time.time() + 3600),
}
with patch.object(
verifier, "_introspect_token", return_value=introspection_response
):
opaque_token = "opaque-token-12345"
result = await verifier._verify_multi_audience_token(opaque_token)
assert result is None
class TestExchangeModeVerification:
"""Test token exchange mode verification."""
async def test_verify_mcp_audience_only_success(self, exchange_settings):
"""Test MCP-only audience verification succeeds with MCP audience."""
verifier = UnifiedTokenVerifier(exchange_settings)
# Mock introspection response with MCP audience only
introspection_response = {
"active": True,
"sub": "testuser",
"aud": ["test-client-id"],
"scope": "openid profile",
"exp": int(time.time() + 3600),
"client_id": "test-client-id",
}
with patch.object(
verifier, "_introspect_token", return_value=introspection_response
):
opaque_token = "opaque-token-12345"
result = await verifier._verify_mcp_audience_only(opaque_token)
assert result is not None
assert result.resource == "testuser"
async def test_verify_mcp_audience_only_fails_without_mcp(self, exchange_settings):
"""Test MCP-only audience verification fails without MCP audience."""
verifier = UnifiedTokenVerifier(exchange_settings)
# Mock introspection response without MCP audience
introspection_response = {
"active": True,
"sub": "testuser",
"aud": ["http://localhost:8080"], # Wrong audience
"scope": "openid profile",
"exp": int(time.time() + 3600),
}
with patch.object(
verifier, "_introspect_token", return_value=introspection_response
):
opaque_token = "opaque-token-12345"
result = await verifier._verify_mcp_audience_only(opaque_token)
assert result is None
class TestIntrospection:
"""Test token introspection."""
async def test_introspect_active_token(self, base_settings):
"""Test introspection of active token."""
verifier = UnifiedTokenVerifier(base_settings)
# Mock HTTP response
mock_response = MagicMock()
mock_response.status_code = 200
mock_response.json.return_value = {
"active": True,
"sub": "testuser",
"aud": ["test-client-id", "http://localhost:8080"],
"scope": "openid profile",
"exp": int(time.time() + 3600),
"client_id": "test-client-id",
}
verifier.http_client.post = AsyncMock(return_value=mock_response)
result = await verifier._introspect_token("test-token")
assert result is not None
assert result["active"] is True
assert result["sub"] == "testuser"
async def test_introspect_inactive_token(self, base_settings):
"""Test introspection of inactive token."""
verifier = UnifiedTokenVerifier(base_settings)
# Mock HTTP response
mock_response = MagicMock()
mock_response.status_code = 200
mock_response.json.return_value = {"active": False}
verifier.http_client.post = AsyncMock(return_value=mock_response)
result = await verifier._introspect_token("test-token")
assert result is None
async def test_introspect_without_endpoint(self, base_settings):
"""Test introspection when endpoint not configured."""
base_settings.introspection_uri = None
verifier = UnifiedTokenVerifier(base_settings)
result = await verifier._introspect_token("test-token")
assert result is None
class TestAccessTokenCreation:
"""Test AccessToken object creation."""
def test_create_access_token_success(self, base_settings):
"""Test successful AccessToken creation."""
verifier = UnifiedTokenVerifier(base_settings)
payload = {
"sub": "testuser",
"scope": "openid profile email",
"exp": int(time.time() + 3600),
"client_id": "test-client-id",
}
token = "test-token-123"
result = verifier._create_access_token(token, payload)
assert result is not None
assert result.token == token
assert result.resource == "testuser"
assert result.scopes == ["openid", "profile", "email"]
assert result.client_id == "test-client-id"
def test_create_access_token_with_preferred_username(self, base_settings):
"""Test AccessToken creation with preferred_username fallback."""
verifier = UnifiedTokenVerifier(base_settings)
payload = {
"preferred_username": "testuser", # No 'sub' claim
"scope": "openid profile",
"exp": int(time.time() + 3600),
}
token = "test-token-123"
result = verifier._create_access_token(token, payload)
assert result is not None
assert result.resource == "testuser"
def test_create_access_token_no_username(self, base_settings):
"""Test AccessToken creation fails without username."""
verifier = UnifiedTokenVerifier(base_settings)
payload = {
# No sub or preferred_username
"scope": "openid profile",
"exp": int(time.time() + 3600),
}
token = "test-token-123"
result = verifier._create_access_token(token, payload)
assert result is None
def test_create_access_token_no_expiry(self, base_settings):
"""Test AccessToken creation uses default TTL without expiry."""
verifier = UnifiedTokenVerifier(base_settings)
payload = {
"sub": "testuser",
"scope": "openid profile",
# No exp claim
}
token = "test-token-123"
result = verifier._create_access_token(token, payload)
assert result is not None
# Should have set a default expiry
assert result.expires_at > int(time.time())
class TestVerifyTokenFlow:
"""Test complete verify_token flow."""
async def test_verify_token_from_cache(self, base_settings):
"""Test verify_token returns cached token."""
verifier = UnifiedTokenVerifier(base_settings)
payload = {
"aud": ["test-client-id", "http://localhost:8080"],
"sub": "testuser",
"scope": "openid profile",
"exp": int(time.time() + 3600),
}
token = jwt.encode(payload, "secret", algorithm="HS256")
# First call - should cache
result1 = verifier._create_access_token(token, payload)
assert result1 is not None
# Mock _verify_multi_audience_token to ensure it's not called
with patch.object(verifier, "_verify_multi_audience_token") as mock_verify:
result2 = await verifier.verify_token(token)
assert result2 is not None
assert result2.resource == "testuser"
# Should not call verification since it's cached
mock_verify.assert_not_called()
async def test_verify_token_multi_audience_mode(self, base_settings):
"""Test verify_token in multi-audience mode."""
verifier = UnifiedTokenVerifier(base_settings)
introspection_response = {
"active": True,
"sub": "testuser",
"aud": ["test-client-id", "http://localhost:8080"],
"scope": "openid profile",
"exp": int(time.time() + 3600),
}
with patch.object(
verifier, "_introspect_token", return_value=introspection_response
):
result = await verifier.verify_token("opaque-token")
assert result is not None
assert result.resource == "testuser"
async def test_verify_token_exchange_mode(self, exchange_settings):
"""Test verify_token in exchange mode."""
verifier = UnifiedTokenVerifier(exchange_settings)
introspection_response = {
"active": True,
"sub": "testuser",
"aud": ["test-client-id"], # MCP audience only
"scope": "openid profile",
"exp": int(time.time() + 3600),
}
with patch.object(
verifier, "_introspect_token", return_value=introspection_response
):
result = await verifier.verify_token("opaque-token")
assert result is not None
assert result.resource == "testuser"