aminghadersohi commented on code in PR #39604: URL: https://github.com/apache/superset/pull/39604#discussion_r3244926569
########## superset/mcp_service/composite_token_verifier.py: ########## @@ -0,0 +1,104 @@ +# Licensed to the Apache Software Foundation (ASF) under one +# or more contributor license agreements. See the NOTICE file +# distributed with this work for additional information +# regarding copyright ownership. The ASF licenses this file +# to you under the Apache License, Version 2.0 (the +# "License"); you may not use this file except in compliance +# with the License. You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, +# software distributed under the License is distributed on an +# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +# KIND, either express or implied. See the License for the +# specific language governing permissions and limitations +# under the License. + +""" +Composite token verifier for MCP authentication. + +Routes Bearer tokens to the appropriate verifier based on prefix: +- Tokens matching FAB_API_KEY_PREFIXES (e.g. ``sst_``) are passed through + to the Flask layer where ``_resolve_user_from_api_key()`` handles + actual validation via FAB SecurityManager. +- All other tokens are delegated to the wrapped JWT verifier (when one is + configured); when no JWT verifier is configured, non-API-key tokens are + rejected at the transport layer. +""" + +import logging + +from fastmcp.server.auth import AccessToken +from fastmcp.server.auth.providers.jwt import TokenVerifier + +logger = logging.getLogger(__name__) + +# Namespaced claim that flags an AccessToken as an API-key pass-through. +# Namespacing avoids collision with custom claims an external IdP might +# happen to mint on a JWT — a plain ``_api_key_passthrough`` claim could +# be silently misidentified as a Superset API-key request. +API_KEY_PASSTHROUGH_CLAIM = "_superset_mcp_api_key_passthrough" + + +class CompositeTokenVerifier(TokenVerifier): + """Routes Bearer tokens between API key pass-through and JWT verification. + + API key tokens (identified by prefix) are accepted at the transport layer + with a marker claim so that ``_resolve_user_from_jwt_context()`` can + detect them and fall through to ``_resolve_user_from_api_key()`` for + actual validation. + + Args: + jwt_verifier: The wrapped JWT verifier for non-API-key tokens. + When ``None``, only API-key tokens are accepted; all other + Bearer tokens are rejected at the transport layer (used when + ``MCP_AUTH_ENABLED=False`` but ``FAB_API_KEY_ENABLED=True``). + api_key_prefixes: List of prefixes that identify API key tokens + (e.g. ``["sst_"]``). + """ + + def __init__( + self, + jwt_verifier: TokenVerifier | None, + api_key_prefixes: list[str], + ) -> None: + super().__init__( + base_url=getattr(jwt_verifier, "base_url", None), + required_scopes=getattr(jwt_verifier, "required_scopes", None) or [], + ) + self._jwt_verifier = jwt_verifier + self._api_key_prefixes = tuple(api_key_prefixes) + + async def verify_token(self, token: str) -> AccessToken | None: + """Verify a Bearer token. + + If the token starts with an API key prefix, return a pass-through + AccessToken with a ``_api_key_passthrough`` claim. The Flask-layer Review Comment: Addressed. ########## superset/mcp_service/mcp_config.py: ########## @@ -284,56 +287,88 @@ def create_default_mcp_auth_factory(app: Flask) -> Optional[Any]: - """Default MCP auth factory using app.config values.""" - if not app.config.get("MCP_AUTH_ENABLED", False): - return None + """Default MCP auth factory using app.config values. - jwks_uri = app.config.get("MCP_JWKS_URI") - public_key = app.config.get("MCP_JWT_PUBLIC_KEY") - secret = app.config.get("MCP_JWT_SECRET") + Returns an auth provider when ``MCP_AUTH_ENABLED=True`` (JWT verifier, + optionally wrapped with ``CompositeTokenVerifier`` for API keys) or + when only ``FAB_API_KEY_ENABLED=True`` (API-key-only verifier that + rejects all non-API-key Bearer tokens at the transport). + """ + auth_enabled = app.config.get("MCP_AUTH_ENABLED", False) + api_key_enabled = app.config.get("FAB_API_KEY_ENABLED", False) - if not (jwks_uri or public_key or secret): - logger.warning("MCP_AUTH_ENABLED is True but no JWT keys/secret configured") + if not (auth_enabled or api_key_enabled): return None - try: - debug_errors = app.config.get("MCP_JWT_DEBUG_ERRORS", False) + jwt_verifier: Any | None = None - common_kwargs: dict[str, Any] = { - "issuer": app.config.get("MCP_JWT_ISSUER"), - "audience": app.config.get("MCP_JWT_AUDIENCE"), - "required_scopes": app.config.get("MCP_REQUIRED_SCOPES", []), - } + if auth_enabled: + jwks_uri = app.config.get("MCP_JWKS_URI") + public_key = app.config.get("MCP_JWT_PUBLIC_KEY") + secret = app.config.get("MCP_JWT_SECRET") - # For HS256 (symmetric), use the secret as the public_key parameter - if app.config.get("MCP_JWT_ALGORITHM") == "HS256" and secret: - common_kwargs["public_key"] = secret - common_kwargs["algorithm"] = "HS256" - else: - # For RS256 (asymmetric), use public key or JWKS - common_kwargs["jwks_uri"] = jwks_uri - common_kwargs["public_key"] = public_key - common_kwargs["algorithm"] = app.config.get("MCP_JWT_ALGORITHM", "RS256") - - if debug_errors: - # DetailedJWTVerifier: detailed server-side logging of JWT - # validation failures. HTTP responses are always generic per - # RFC 6750 Section 3.1. - from superset.mcp_service.jwt_verifier import DetailedJWTVerifier - - auth_provider = DetailedJWTVerifier(**common_kwargs) + if not (jwks_uri or public_key or secret): + logger.warning("MCP_AUTH_ENABLED is True but no JWT keys/secret configured") + if not api_key_enabled: + return None else: - # Default JWTVerifier: minimal logging, generic error responses. - from fastmcp.server.auth.providers.jwt import JWTVerifier + try: + jwt_verifier = _build_jwt_verifier( + app=app, + jwks_uri=jwks_uri, + public_key=public_key, + secret=secret, + ) + except Exception: Review Comment: Addressed. ########## superset/mcp_service/auth.py: ########## @@ -218,6 +220,25 @@ if access_token is None: return None + # API key pass-through: CompositeTokenVerifier accepted this token + # at the transport layer but defers actual validation to + # _resolve_user_from_api_key() (priority 2 in get_user_from_request). + # Require client_id=="api_key" (set by CompositeTokenVerifier) in addition + # to the claim so that an external IdP JWT that happens to include the + # claim name is not misclassified as an API-key pass-through. + claims = getattr(access_token, "claims", None) + if isinstance(claims, dict) and claims.get(API_KEY_PASSTHROUGH_CLAIM): + if getattr(access_token, "client_id", None) == "api_key": + logger.debug( + "API key pass-through token detected, deferring to API key auth" + ) + return None + logger.debug( + "Ignoring %s claim on non-API-key token (client_id=%r); processing as JWT", + API_KEY_PASSTHROUGH_CLAIM, Review Comment: Addressed. ########## superset/mcp_service/mcp_config.py: ########## @@ -284,56 +287,88 @@ def create_default_mcp_auth_factory(app: Flask) -> Optional[Any]: - """Default MCP auth factory using app.config values.""" - if not app.config.get("MCP_AUTH_ENABLED", False): - return None + """Default MCP auth factory using app.config values. - jwks_uri = app.config.get("MCP_JWKS_URI") - public_key = app.config.get("MCP_JWT_PUBLIC_KEY") - secret = app.config.get("MCP_JWT_SECRET") + Returns an auth provider when ``MCP_AUTH_ENABLED=True`` (JWT verifier, + optionally wrapped with ``CompositeTokenVerifier`` for API keys) or + when only ``FAB_API_KEY_ENABLED=True`` (API-key-only verifier that + rejects all non-API-key Bearer tokens at the transport). + """ + auth_enabled = app.config.get("MCP_AUTH_ENABLED", False) + api_key_enabled = app.config.get("FAB_API_KEY_ENABLED", False) - if not (jwks_uri or public_key or secret): - logger.warning("MCP_AUTH_ENABLED is True but no JWT keys/secret configured") + if not (auth_enabled or api_key_enabled): return None - try: - debug_errors = app.config.get("MCP_JWT_DEBUG_ERRORS", False) + jwt_verifier: Any | None = None - common_kwargs: dict[str, Any] = { - "issuer": app.config.get("MCP_JWT_ISSUER"), - "audience": app.config.get("MCP_JWT_AUDIENCE"), - "required_scopes": app.config.get("MCP_REQUIRED_SCOPES", []), - } + if auth_enabled: + jwks_uri = app.config.get("MCP_JWKS_URI") + public_key = app.config.get("MCP_JWT_PUBLIC_KEY") + secret = app.config.get("MCP_JWT_SECRET") - # For HS256 (symmetric), use the secret as the public_key parameter - if app.config.get("MCP_JWT_ALGORITHM") == "HS256" and secret: - common_kwargs["public_key"] = secret - common_kwargs["algorithm"] = "HS256" - else: - # For RS256 (asymmetric), use public key or JWKS - common_kwargs["jwks_uri"] = jwks_uri - common_kwargs["public_key"] = public_key - common_kwargs["algorithm"] = app.config.get("MCP_JWT_ALGORITHM", "RS256") - - if debug_errors: - # DetailedJWTVerifier: detailed server-side logging of JWT - # validation failures. HTTP responses are always generic per - # RFC 6750 Section 3.1. - from superset.mcp_service.jwt_verifier import DetailedJWTVerifier - - auth_provider = DetailedJWTVerifier(**common_kwargs) + if not (jwks_uri or public_key or secret): + logger.warning("MCP_AUTH_ENABLED is True but no JWT keys/secret configured") + if not api_key_enabled: + return None else: - # Default JWTVerifier: minimal logging, generic error responses. - from fastmcp.server.auth.providers.jwt import JWTVerifier + try: + jwt_verifier = _build_jwt_verifier( + app=app, + jwks_uri=jwks_uri, + public_key=public_key, + secret=secret, + ) + except Exception: # noqa: BLE001 — JWT lib raises many types; broad catch intentional + # Do not log the exception — it may contain secrets (e.g., key material) + logger.error("Failed to create MCP JWT verifier") + if not api_key_enabled: + return None + + if api_key_enabled: + api_key_prefixes = app.config.get("FAB_API_KEY_PREFIXES", ["sst_"]) + logger.info("API key auth enabled for MCP") + return CompositeTokenVerifier( + jwt_verifier=jwt_verifier, + api_key_prefixes=api_key_prefixes, + ) Review Comment: Addressed. ########## superset/mcp_service/composite_token_verifier.py: ########## @@ -0,0 +1,105 @@ +# Licensed to the Apache Software Foundation (ASF) under one +# or more contributor license agreements. See the NOTICE file +# distributed with this work for additional information +# regarding copyright ownership. The ASF licenses this file +# to you under the Apache License, Version 2.0 (the +# "License"); you may not use this file except in compliance +# with the License. You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, +# software distributed under the License is distributed on an +# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +# KIND, either express or implied. See the License for the +# specific language governing permissions and limitations +# under the License. + +""" +Composite token verifier for MCP authentication. + +Routes Bearer tokens to the appropriate verifier based on prefix: +- Tokens matching FAB_API_KEY_PREFIXES (e.g. ``sst_``) are passed through + to the Flask layer where ``_resolve_user_from_api_key()`` handles + actual validation via FAB SecurityManager. +- All other tokens are delegated to the wrapped JWT verifier (when one is + configured); when no JWT verifier is configured, non-API-key tokens are + rejected at the transport layer. +""" + +import logging + +from fastmcp.server.auth import AccessToken +from fastmcp.server.auth.providers.jwt import TokenVerifier + +logger = logging.getLogger(__name__) + +# Namespaced claim that flags an AccessToken as an API-key pass-through. +# Namespacing avoids collision with custom claims an external IdP might +# happen to mint on a JWT — a plain ``_api_key_passthrough`` claim could +# be silently misidentified as a Superset API-key request. +API_KEY_PASSTHROUGH_CLAIM = "_superset_mcp_api_key_passthrough" + + +class CompositeTokenVerifier(TokenVerifier): + """Routes Bearer tokens between API key pass-through and JWT verification. + + API key tokens (identified by prefix) are accepted at the transport layer + with a marker claim so that ``_resolve_user_from_jwt_context()`` can + detect them and fall through to ``_resolve_user_from_api_key()`` for + actual validation. + + Args: + jwt_verifier: The wrapped JWT verifier for non-API-key tokens. + When ``None``, only API-key tokens are accepted; all other + Bearer tokens are rejected at the transport layer (used when + ``MCP_AUTH_ENABLED=False`` but ``FAB_API_KEY_ENABLED=True``). + api_key_prefixes: List of prefixes that identify API key tokens + (e.g. ``["sst_"]``). + """ + + def __init__( + self, + jwt_verifier: TokenVerifier | None, + api_key_prefixes: list[str], + ) -> None: + super().__init__( + base_url=getattr(jwt_verifier, "base_url", None), + required_scopes=getattr(jwt_verifier, "required_scopes", None) or [], + ) + self._jwt_verifier = jwt_verifier + self._api_key_prefixes = tuple(api_key_prefixes) + Review Comment: Addressed. ########## superset/mcp_service/composite_token_verifier.py: ########## @@ -0,0 +1,113 @@ +# Licensed to the Apache Software Foundation (ASF) under one +# or more contributor license agreements. See the NOTICE file +# distributed with this work for additional information +# regarding copyright ownership. The ASF licenses this file +# to you under the Apache License, Version 2.0 (the +# "License"); you may not use this file except in compliance +# with the License. You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, +# software distributed under the License is distributed on an +# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +# KIND, either express or implied. See the License for the +# specific language governing permissions and limitations +# under the License. + +""" +Composite token verifier for MCP authentication. + +Routes Bearer tokens to the appropriate verifier based on prefix: +- Tokens matching FAB_API_KEY_PREFIXES (e.g. ``sst_``) are passed through + to the Flask layer where ``_resolve_user_from_api_key()`` handles + actual validation via FAB SecurityManager. +- All other tokens are delegated to the wrapped JWT verifier (when one is + configured); when no JWT verifier is configured, non-API-key tokens are + rejected at the transport layer. +""" + +import logging + +from fastmcp.server.auth import AccessToken +from fastmcp.server.auth.providers.jwt import TokenVerifier + +logger = logging.getLogger(__name__) + +# Namespaced claim that flags an AccessToken as an API-key pass-through. +# Namespacing avoids collision with custom claims an external IdP might +# happen to mint on a JWT — a plain ``_api_key_passthrough`` claim could +# be silently misidentified as a Superset API-key request. +API_KEY_PASSTHROUGH_CLAIM = "_superset_mcp_api_key_passthrough" + + +class CompositeTokenVerifier(TokenVerifier): + """Routes Bearer tokens between API key pass-through and JWT verification. + + API key tokens (identified by prefix) are accepted at the transport layer + with a marker claim so that ``_resolve_user_from_jwt_context()`` can + detect them and fall through to ``_resolve_user_from_api_key()`` for + actual validation. + + Args: + jwt_verifier: The wrapped JWT verifier for non-API-key tokens. + When ``None``, only API-key tokens are accepted; all other + Bearer tokens are rejected at the transport layer (used when + ``MCP_AUTH_ENABLED=False`` but ``FAB_API_KEY_ENABLED=True``). + api_key_prefixes: List of prefixes that identify API key tokens + (e.g. ``["sst_"]``). + """ + + def __init__( + self, + jwt_verifier: TokenVerifier | None, + api_key_prefixes: list[str], + ) -> None: + super().__init__( + base_url=getattr(jwt_verifier, "base_url", None), + required_scopes=getattr(jwt_verifier, "required_scopes", None) or [], + ) + self._jwt_verifier = jwt_verifier + valid: list[str] = [ + p for p in api_key_prefixes if isinstance(p, str) and p.strip() + ] + invalid = [p for p in api_key_prefixes if p not in valid] + if invalid: + logger.warning( + "FAB_API_KEY_PREFIXES contains invalid entries (ignored): %r", invalid Review Comment: Addressed. ########## tests/unit_tests/mcp_service/test_auth_api_key.py: ########## @@ -54,100 +84,110 @@ def _disable_api_keys(app): app.config["MCP_DEV_USERNAME"] = old_dev +@contextmanager +def _mock_sm_ctx(app: SupersetApp, mock_sm: MagicMock): + """Push an app context with g.user cleared and appbuilder.sm mocked. + + Defaults find_user_with_relationships to None so JWT/dev-user lookups + that hit the SM (via load_user_with_relationships) behave as "user not + found" without a real DB, matching the pre-refactor db.session behavior. + Tests that need a specific return value should set it on mock_sm directly. + """ + mock_sm.find_user_with_relationships.return_value = None Review Comment: Addressed. -- This is an automated message from the Apache Git Service. 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