JWT drivers: Deprecate RS256withJWKS, introduce OpenIDConnect

Replace the RS256withJWKS driver with the simplified OpenIDConnect
driver. The new driver doesn't require the 'keys_url' parameter,
all needed parameters are fetched from the well-known config
endpoint inferred from the issuer_id.

Add a simple workflow test of the OpenIDConnect driver.

Change-Id: I4b0936a587918d6051a4206e20cad68577617e3d

doc/source/discussion/components.rst

@@ -977,8 +977,9 @@ protected endpoints and configure JWT validation:
 
    .. attr:: driver
 
-      The signing algorithm to use. Accepted values are ``HS256``, ``RS256`` or
-      ``RS256withJWKS``. See below for driver-specific configuration options.
+      The signing algorithm to use. Accepted values are ``HS256``, ``RS256``,
+      ``RS256withJWKS`` or ``OpenIDConnect``. See below for driver-specific
+      configuration options.
 
    .. attr:: allow_authz_override
       :default: false
@@ -1064,6 +1065,10 @@ the public key is needed by Zuul for signature validation.
 RS256withJWKS
 ,,,,,,,,,,,,,
 
+.. warning::
+
+   This driver is deprecated, use ``OpenIDConnect`` instead.
+
 Some Identity Providers use key sets (also known as **JWKS**), therefore the key to
 use when verifying the Authentication Token's signatures cannot be known in
 advance; the key's id is stored in the JWT's header and the key must then be
@@ -1076,6 +1081,31 @@ The key set is usually available at a specific URL that can be found in the
    The URL where the Identity Provider's key set can be found. For example, for
    Google's OAuth service: https://www.googleapis.com/oauth2/v3/certs
 
+OpenIDConnect
+,,,,,,,,,,,,,
+
+Use a third-party Identity Provider implementing the OpenID Connect protocol.
+The issuer ID should be an URI, from which the "well-known" configuration URI
+of the Identity Provider can be inferred. This is intended to be used for
+authentication on Zuul's web user interface.
+
+.. attr:: scope
+   :default: openid profile
+
+   The scope(s) to use when requesting access to a user's details. This attribute
+   can be multivalued (values must be separated by a space). Most OpenID Connect
+   Identity Providers support the default scopes "openid profile". A full list
+   of supported scopes can be found in the well-known configuration of the
+   Identity Provider under the key "scopes_supported".
+
+.. attr:: keys_url
+
+   Optional. The URL where the Identity Provider's key set can be found.
+   For example, for Google's OAuth service: https://www.googleapis.com/oauth2/v3/certs
+   The well-known configuration of the Identity Provider should provide this URL
+   under the key "jwks_uri", therefore this attribute is usually not necessary.
+
+
 Operation
 ~~~~~~~~~
 

releasenotes/notes/deprecate-RS256withJWKS-0303fd688958dff9.yaml

@@ -0,0 +1,7 @@
+---
+deprecations:
+  - |
+    Authentication: the JWT driver "RS256withJWKS" is deprecated in favor of the
+    "OpenIDConnect" driver. The "OpenIDConnect" driver simplifies configuration
+    for administrators and is better aligned with OIDC configuration discovery
+    conventions.

tests/fixtures/auth/oidc-key

@@ -0,0 +1,51 @@
+-----BEGIN RSA PRIVATE KEY-----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+2bN87ihiQifgZ1U+oyp0a2zkAOWCDEx4RQqwc/EE7rmq5NpcSvpbVaXLOeMCAwEA
+AQKCAgA3sHqhg7NwBAPdJY3gpc5iHIknBeA8JSagp/kOQFomh/B9B7wK1ZeqdsL9
+LYMQ4/JhTF2GEaXd7qGrvHvnnjBknF/0t2ASZqWvM5h3FUwq1wEYW4HHe65+yJHZ
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+JG5CBldXZgLOOoPr93F+fuYQ4nou3TMXxs71N6uo7+lu3OmpCytCGItbeFh7aFsX
+1BMvd4k1X8DI1Lipg7TeWEHC297592sB+Id9BDtpwBe+HBEK9rHVNI3EESzhOndZ
+lXJoKTNRPSCFSrwR4XEOqZfixdbcdZWotGtA0u9Z0AzHH36zXWDNu4O8Kv+2HEa/
+Hykv69DJrGAa77oi2hCojKBFW+4h+lNP/jKE7XYWXhwJRajumWOrjne8RO5NIdLr
+8ZNJAoIBAAW0D2nD5SRiT9NZ9Y8aYPE9BTCQWnNarEFXTNya8dBq6wZ6xk7shbRf
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+2hCQhg6IiXidcX5+Azo69G3I4cs46kzJiZ63LJd4yOestpT60hb8BiSW7G3DjNCl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=
+-----END RSA PRIVATE KEY-----

tests/fixtures/auth/oidc-key.pub

@@ -0,0 +1,14 @@
+-----BEGIN PUBLIC KEY-----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+-----END PUBLIC KEY-----

tests/fixtures/auth/openid-configuration.json

@@ -0,0 +1,130 @@
+{
+  "issuer": "https://my.oidc.provider/auth/realms/realm-one",
+  "authorization_endpoint": "https://my.oidc.provider/auth/realms/realm-one/protocol/openid-connect/auth",
+  "token_endpoint": "https://my.oidc.provider/auth/realms/realm-one/protocol/openid-connect/token",
+  "token_introspection_endpoint": "https://my.oidc.provider/auth/realms/realm-one/protocol/openid-connect/token/introspect",
+  "userinfo_endpoint": "https://my.oidc.provider/auth/realms/realm-one/protocol/openid-connect/userinfo",
+  "end_session_endpoint": "https://my.oidc.provider/auth/realms/realm-one/protocol/openid-connect/logout",
+  "jwks_uri": "https://my.oidc.provider/auth/realms/realm-one/protocol/openid-connect/certs",
+  "check_session_iframe": "https://my.oidc.provider/auth/realms/realm-one/protocol/openid-connect/login-status-iframe.html",
+  "grant_types_supported": [
+    "authorization_code",
+    "implicit",
+    "refresh_token",
+    "password",
+    "client_credentials"
+  ],
+  "response_types_supported": [
+    "code",
+    "none",
+    "id_token",
+    "token",
+    "id_token token",
+    "code id_token",
+    "code token",
+    "code id_token token"
+  ],
+  "subject_types_supported": [
+    "public",
+    "pairwise"
+  ],
+  "id_token_signing_alg_values_supported": [
+    "PS384",
+    "ES384",
+    "RS384",
+    "HS256",
+    "HS512",
+    "ES256",
+    "RS256",
+    "HS384",
+    "ES512",
+    "PS256",
+    "PS512",
+    "RS512"
+  ],
+  "id_token_encryption_alg_values_supported": [
+    "RSA-OAEP",
+    "RSA1_5"
+  ],
+  "id_token_encryption_enc_values_supported": [
+    "A128GCM",
+    "A128CBC-HS256"
+  ],
+  "userinfo_signing_alg_values_supported": [
+    "PS384",
+    "ES384",
+    "RS384",
+    "HS256",
+    "HS512",
+    "ES256",
+    "RS256",
+    "HS384",
+    "ES512",
+    "PS256",
+    "PS512",
+    "RS512",
+    "none"
+  ],
+  "request_object_signing_alg_values_supported": [
+    "PS384",
+    "ES384",
+    "RS384",
+    "ES256",
+    "RS256",
+    "ES512",
+    "PS256",
+    "PS512",
+    "RS512",
+    "none"
+  ],
+  "response_modes_supported": [
+    "query",
+    "fragment",
+    "form_post"
+  ],
+  "registration_endpoint": "https://my.oidc.provider/auth/realms/realm-one/clients-registrations/openid-connect",
+  "token_endpoint_auth_methods_supported": [
+    "private_key_jwt",
+    "client_secret_basic",
+    "client_secret_post",
+    "client_secret_jwt"
+  ],
+  "token_endpoint_auth_signing_alg_values_supported": [
+    "RS256"
+  ],
+  "claims_supported": [
+    "aud",
+    "sub",
+    "iss",
+    "auth_time",
+    "name",
+    "given_name",
+    "family_name",
+    "preferred_username",
+    "email"
+  ],
+  "claim_types_supported": [
+    "normal"
+  ],
+  "claims_parameter_supported": false,
+  "scopes_supported": [
+    "openid",
+    "web-origins",
+    "email",
+    "profile",
+    "microprofile-jwt",
+    "address",
+    "zuul_audience",
+    "offline_access",
+    "phone",
+    "roles"
+  ],
+  "request_parameter_supported": true,
+  "request_uri_parameter_supported": true,
+  "code_challenge_methods_supported": [
+    "plain",
+    "S256"
+  ],
+  "tls_client_certificate_bound_access_tokens": true,
+  "introspection_endpoint": "https://my.oidc.provider/auth/realms/realm-one/protocol/openid-connect/token/introspect"
+}

tests/unit/test_auth.py

@@ -0,0 +1,97 @@
+# Copyright 2020 OpenStack Foundation
+# Copyright 2020 Red Hat, Inc.
+#
+# Licensed 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.
+
+import json
+from unittest import mock
+import os.path
+import jwt
+import time
+
+from zuul.driver import auth
+
+from tests.base import BaseTestCase, FIXTURE_DIR
+
+with open(os.path.join(FIXTURE_DIR,
+                       'auth/openid-configuration.json'), 'r') as well_known:
+    FAKE_WELL_KNOWN_CONFIG = json.loads(well_known.read())
+
+
+algo = jwt.algorithms.RSAAlgorithm(jwt.algorithms.RSAAlgorithm.SHA256)
+with open(os.path.join(FIXTURE_DIR,
+                       'auth/oidc-key'), 'r') as k:
+    OIDC_PRIVATE_KEY = algo.prepare_key(k.read().encode('utf-8'))
+with open(os.path.join(FIXTURE_DIR,
+                       'auth/oidc-key.pub'), 'r') as k:
+    pub_key = algo.prepare_key(k.read().encode('utf-8'))
+    pub_jwk = algo.to_jwk(pub_key)
+    key = {
+        "kid": "OwO",
+        "use": "sig",
+        "alg": "RS256"
+    }
+    key.update(json.loads(pub_jwk))
+    # not present in keycloak jwks
+    if "key_ops" in key:
+        del key["key_ops"]
+    FAKE_CERTS = {
+        "keys": [
+            key
+        ]
+    }
+
+
+def mock_get(url, params=None, **kwargs):
+    if url == ("https://my.oidc.provider/auth/realms/realm-one/"
+               ".well-known/openid-configuration"):
+        return FakeResponse(FAKE_WELL_KNOWN_CONFIG)
+    elif url == ("https://my.oidc.provider/auth/realms/realm-one/"
+                 "protocol/openid-connect/certs"):
+        return FakeResponse(FAKE_CERTS)
+    else:
+        raise Exception("Unknown URL %s" % url)
+
+
+class FakeResponse:
+    def __init__(self, json_dict):
+        self._json = json_dict
+
+    def json(self):
+        return self._json
+
+
+class TestOpenIDConnectAuthenticator(BaseTestCase):
+    def test_decodeToken(self):
+        """Test the decoding workflow"""
+        config = {
+            'issuer_id': FAKE_WELL_KNOWN_CONFIG['issuer'],
+            'client_id': 'zuul-app',
+            'realm': 'realm-one',
+        }
+        OIDCAuth = auth.jwt.OpenIDConnectAuthenticator(**config)
+        payload = {
+            'iss': FAKE_WELL_KNOWN_CONFIG['issuer'],
+            'aud': config['client_id'],
+            'exp': time.time() + 3600,
+            'sub': 'someone'
+        }
+        token = jwt.encode(
+            payload,
+            OIDC_PRIVATE_KEY,
+            algorithm='RS256',
+            headers={'kid': 'OwO'})
+        with mock.patch('requests.get', side_effect=mock_get):
+            decoded = OIDCAuth.decodeToken(token)
+            for claim in payload.keys():
+                self.assertEqual(payload[claim], decoded[claim])

zuul/driver/auth/jwt.py

@@ -19,6 +19,7 @@ import time
 import jwt
 import requests
 import json
+from urllib.parse import urljoin
 
 from zuul import exceptions
 from zuul.driver import AuthenticatorInterface
@@ -164,55 +165,97 @@ class RS256Authenticator(JWTAuthenticator):
                           algorithms=self.algorithm)
 
 
-class RS256withJWKSAuthenticator(JWTAuthenticator):
-    """JWT authentication using the RS256 algorithm.
+class OpenIDConnectAuthenticator(JWTAuthenticator):
+    """JWT authentication using an OpenIDConnect provider.
 
-    Requires the URL of the certificates used by the Identity Provier. It can
-    be found usually under the key "jwks_uri" at the provider's
-    .well-known/openid-configuration URL."""
+    If the optional 'keys_url' parameter is not specified, the authenticator
+    will attempt to determine it via the well-known configuration URI as
+    described in
+    https://openid.net/specs/openid-connect-discovery-1_0.html#ProviderConfig"""  # noqa
 
+    # default algorithm, TOFO: should this be a config param?
     algorithm = 'RS256'
-    name = 'RS256withJWKS'
+    name = 'OpenIDConnect'
 
     def __init__(self, **conf):
-        super(RS256withJWKSAuthenticator, self).__init__(**conf)
+        super(OpenIDConnectAuthenticator, self).__init__(**conf)
         self.keys_url = conf.get('keys_url', None)
-
-    def _decode(self, rawToken):
-        unverified_headers = jwt.get_unverified_header(rawToken)
-        key_id = unverified_headers.get('kid', None)
-        if key_id is None:
+        self.scope = conf.get('scope', 'openid profile')
+
+    def get_key(self, key_id):
+        keys_url = self.keys_url
+        if keys_url is None:
+            well_known = self.get_well_known_config()
+            keys_url = well_known.get('jwks_uri', None)
+        if keys_url is None:
+            msg = 'Invalid OpenID configuration: "jwks_uri" not found'
+            logger.error(msg)
             raise exceptions.JWKSException(
-                self.realm, 'No key ID in token header')
+                realm=self.realm,
+                msg=msg)
         # TODO keys can probably be cached
         try:
-            certs = requests.get(self.keys_url).json()
+            certs = requests.get(keys_url).json()
         except Exception as e:
             msg = 'Could not fetch Identity Provider keys at %s: %s'
-            logger.error(msg % (self.keys_url, e))
+            logger.error(msg % (keys_url, e))
             raise exceptions.JWKSException(
                 realm=self.realm,
                 msg='There was an error while fetching '
-                    'keys for Identity Provider')
+                    'keys for Identity Provider, check logs for details')
         for key_dict in certs['keys']:
             if key_dict.get('kid') == key_id:
+                # TODO: theoretically two other types of keys are
+                # supported by the JWKS standard. We should raise an error
+                # in the unlikely case 'kty' is not RSA.
+                # (see https://tools.ietf.org/html/rfc7518#section-6.1)
                 key = jwt.algorithms.RSAAlgorithm.from_jwk(
                     json.dumps(key_dict))
-                return jwt.decode(rawToken, key, issuer=self.issuer_id,
-                                  audience=self.audience,
-                                  algorithms=self.algorithm)
+                algorithm = key_dict.get('alg', None) or self.algorithm
+                return key, algorithm
         raise exceptions.JWKSException(
             self.realm,
             'Cannot verify token: public key %s '
             'not listed by Identity Provider' % key_id)
 
+    def get_well_known_config(self):
+        issuer = self.issuer_id
+        if not issuer.endswith('/'):
+            issuer += '/'
+        well_known_uri = urljoin(issuer,
+                                 '.well-known/openid-configuration')
+        try:
+            return requests.get(well_known_uri).json()
+        except Exception as e:
+            msg = 'Could not fetch OpenID configuration at %s: %s'
+            logger.error(msg % (well_known_uri, e))
+            raise exceptions.JWKSException(
+                realm=self.realm,
+                msg='There was an error while fetching '
+                    'OpenID configuration, check logs for details')
+
+    def _decode(self, rawToken):
+        unverified_headers = jwt.get_unverified_header(rawToken)
+        key_id = unverified_headers.get('kid', None)
+        if key_id is None:
+            raise exceptions.JWKSException(
+                self.realm, 'No key ID in token header')
+        key, algorithm = self.get_key(key_id)
+        return jwt.decode(rawToken, key, issuer=self.issuer_id,
+                          audience=self.audience,
+                          algorithms=algorithm)
+
 
 AUTHENTICATORS = {
     'HS256': HS256Authenticator,
     'RS256': RS256Authenticator,
-    'RS256withJWKS': RS256withJWKSAuthenticator,
+    'RS256withJWKS': OpenIDConnectAuthenticator,
+    'OpenIDConnect': OpenIDConnectAuthenticator,
 }
 
 
 def get_authenticator_by_name(name):
+    if name == 'RS256withJWKS':
+        logger.info(
+            'Driver "%s" is deprecated, please use "OpenIDConnect" instead')
     return AUTHENTICATORS[name]