# 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 datetime import uuid from lxml import etree # nosec(cjschaef): used to create xml, not parse it from oslo_config import cfg from six.moves import urllib from keystoneclient import access from keystoneclient.auth.identity import v3 from keystoneclient import exceptions from keystoneclient.i18n import _ class _BaseSAMLPlugin(v3.AuthConstructor): HTTP_MOVED_TEMPORARILY = 302 HTTP_SEE_OTHER = 303 PROTOCOL = 'saml2' @staticmethod def _first(_list): if len(_list) != 1: raise IndexError(_("Only single element list is acceptable")) return _list[0] @staticmethod def str_to_xml(content, msg=None, include_exc=True): try: return etree.XML(content) except etree.XMLSyntaxError as e: if not msg: msg = str(e) else: msg = msg % e if include_exc else msg raise exceptions.AuthorizationFailure(msg) @staticmethod def xml_to_str(content, **kwargs): return etree.tostring(content, **kwargs) @property def token_url(self): """Return full URL where authorization data is sent.""" values = { 'host': self.auth_url.rstrip('/'), 'identity_provider': self.identity_provider, 'protocol': self.PROTOCOL } url = ("%(host)s/OS-FEDERATION/identity_providers/" "%(identity_provider)s/protocols/%(protocol)s/auth") url = url % values return url @classmethod def get_options(cls): options = super(_BaseSAMLPlugin, cls).get_options() options.extend([ cfg.StrOpt('identity-provider', help="Identity Provider's name"), cfg.StrOpt('identity-provider-url', help="Identity Provider's URL"), cfg.StrOpt('username', dest='username', help='Username', deprecated_name='user-name'), cfg.StrOpt('password', secret=True, help='Password') ]) return options class Saml2UnscopedTokenAuthMethod(v3.AuthMethod): _method_parameters = [] def get_auth_data(self, session, auth, headers, **kwargs): raise exceptions.MethodNotImplemented(_('This method should never ' 'be called')) class Saml2UnscopedToken(_BaseSAMLPlugin): r"""Implement authentication plugin for SAML2 protocol. ECP stands for `Enhanced Client or Proxy` and is a SAML2 extension for federated authentication where a transportation layer consists of HTTP protocol and XML SOAP messages. `Read for more information `_ on ECP. Reference the `SAML2 ECP specification `_. Currently only HTTPBasicAuth mechanism is available for the IdP authenication. :param auth_url: URL of the Identity Service :type auth_url: string :param identity_provider: name of the Identity Provider the client will authenticate against. This parameter will be used to build a dynamic URL used to obtain unscoped OpenStack token. :type identity_provider: string :param identity_provider_url: An Identity Provider URL, where the SAML2 authn request will be sent. :type identity_provider_url: string :param username: User's login :type username: string :param password: User's password :type password: string """ _auth_method_class = Saml2UnscopedTokenAuthMethod SAML2_HEADER_INDEX = 0 ECP_SP_EMPTY_REQUEST_HEADERS = { 'Accept': 'text/html, application/vnd.paos+xml', 'PAOS': ('ver="urn:liberty:paos:2003-08";"urn:oasis:names:tc:' 'SAML:2.0:profiles:SSO:ecp"') } ECP_SP_SAML2_REQUEST_HEADERS = { 'Content-Type': 'application/vnd.paos+xml' } ECP_SAML2_NAMESPACES = { 'ecp': 'urn:oasis:names:tc:SAML:2.0:profiles:SSO:ecp', 'S': 'http://schemas.xmlsoap.org/soap/envelope/', 'paos': 'urn:liberty:paos:2003-08' } ECP_RELAY_STATE = '//ecp:RelayState' ECP_SERVICE_PROVIDER_CONSUMER_URL = ('/S:Envelope/S:Header/paos:Request/' '@responseConsumerURL') ECP_IDP_CONSUMER_URL = ('/S:Envelope/S:Header/ecp:Response/' '@AssertionConsumerServiceURL') SOAP_FAULT = """ S:Server responseConsumerURL from SP and assertionConsumerServiceURL from IdP do not match """ def __init__(self, auth_url, identity_provider, identity_provider_url, username, password, **kwargs): super(Saml2UnscopedToken, self).__init__(auth_url=auth_url, **kwargs) self.identity_provider = identity_provider self.identity_provider_url = identity_provider_url self._username, self._password = username, password @property def username(self): # Override to remove deprecation. return self._username @username.setter def username(self, value): # Override to remove deprecation. self._username = value @property def password(self): # Override to remove deprecation. return self._password @password.setter def password(self, value): # Override to remove deprecation. self._password = value def _handle_http_ecp_redirect(self, session, response, method, **kwargs): if response.status_code not in (self.HTTP_MOVED_TEMPORARILY, self.HTTP_SEE_OTHER): return response location = response.headers['location'] return session.request(location, method, authenticated=False, **kwargs) def _prepare_idp_saml2_request(self, saml2_authn_request): header = saml2_authn_request[self.SAML2_HEADER_INDEX] saml2_authn_request.remove(header) def _check_consumer_urls(self, session, sp_response_consumer_url, idp_sp_response_consumer_url): """Check if consumer URLs issued by SP and IdP are equal. In the initial SAML2 authn Request issued by a Service Provider there is a url called ``consumer url``. A trusted Identity Provider should issue identical url. If the URLs are not equal the federated authn process should be interrupted and the user should be warned. :param session: session object to send out HTTP requests. :type session: keystoneclient.session.Session :param sp_response_consumer_url: consumer URL issued by a SP :type sp_response_consumer_url: string :param idp_sp_response_consumer_url: consumer URL issued by an IdP :type idp_sp_response_consumer_url: string """ if sp_response_consumer_url != idp_sp_response_consumer_url: # send fault message to the SP, discard the response session.post(sp_response_consumer_url, data=self.SOAP_FAULT, headers=self.ECP_SP_SAML2_REQUEST_HEADERS, authenticated=False) # prepare error message and raise an exception. msg = _("Consumer URLs from Service Provider %(service_provider)s " "%(sp_consumer_url)s and Identity Provider " "%(identity_provider)s %(idp_consumer_url)s are not equal") msg = msg % { 'service_provider': self.token_url, 'sp_consumer_url': sp_response_consumer_url, 'identity_provider': self.identity_provider, 'idp_consumer_url': idp_sp_response_consumer_url } raise exceptions.ValidationError(msg) def _send_service_provider_request(self, session): """Initial HTTP GET request to the SAML2 protected endpoint. It's crucial to include HTTP headers indicating that the client is willing to take advantage of the ECP SAML2 extension and receive data as the SOAP. Unlike standard authentication methods in the OpenStack Identity, the client accesses:: ``/v3/OS-FEDERATION/identity_providers/{identity_providers}/ protocols/{protocol}/auth`` After a successful HTTP call the HTTP response should include SAML2 authn request in the XML format. If a HTTP response contains ``X-Subject-Token`` in the headers and the response body is a valid JSON assume the user was already authenticated and Keystone returned a valid unscoped token. Return True indicating the user was already authenticated. :param session: a session object to send out HTTP requests. :type session: keystoneclient.session.Session """ sp_response = session.get(self.token_url, headers=self.ECP_SP_EMPTY_REQUEST_HEADERS, authenticated=False) if 'X-Subject-Token' in sp_response.headers: self.authenticated_response = sp_response return True try: self.saml2_authn_request = etree.XML(sp_response.content) except etree.XMLSyntaxError as e: msg = _("SAML2: Error parsing XML returned " "from Service Provider, reason: %s") % e raise exceptions.AuthorizationFailure(msg) relay_state = self.saml2_authn_request.xpath( self.ECP_RELAY_STATE, namespaces=self.ECP_SAML2_NAMESPACES) self.relay_state = self._first(relay_state) sp_response_consumer_url = self.saml2_authn_request.xpath( self.ECP_SERVICE_PROVIDER_CONSUMER_URL, namespaces=self.ECP_SAML2_NAMESPACES) self.sp_response_consumer_url = self._first(sp_response_consumer_url) return False def _send_idp_saml2_authn_request(self, session): """Present modified SAML2 authn assertion from the Service Provider.""" self._prepare_idp_saml2_request(self.saml2_authn_request) idp_saml2_authn_request = self.saml2_authn_request # Currently HTTPBasicAuth method is hardcoded into the plugin idp_response = session.post( self.identity_provider_url, headers={'Content-type': 'text/xml'}, data=etree.tostring(idp_saml2_authn_request), requests_auth=(self.username, self.password), authenticated=False, log=False) try: self.saml2_idp_authn_response = etree.XML(idp_response.content) except etree.XMLSyntaxError as e: msg = _("SAML2: Error parsing XML returned " "from Identity Provider, reason: %s") % e raise exceptions.AuthorizationFailure(msg) idp_response_consumer_url = self.saml2_idp_authn_response.xpath( self.ECP_IDP_CONSUMER_URL, namespaces=self.ECP_SAML2_NAMESPACES) self.idp_response_consumer_url = self._first(idp_response_consumer_url) self._check_consumer_urls(session, self.idp_response_consumer_url, self.sp_response_consumer_url) def _send_service_provider_saml2_authn_response(self, session): """Present SAML2 assertion to the Service Provider. The assertion is issued by a trusted Identity Provider for the authenticated user. This function directs the HTTP request to SP managed URL, for instance: ``https://:/Shibboleth.sso/ SAML2/ECP``. Upon success there's a session created and access to the protected resource is granted. Many implementations of the SP return HTTP 302/303 status code pointing to the protected URL (``https://:/v3/ OS-FEDERATION/identity_providers/{identity_provider}/protocols/ {protocol_id}/auth`` in this case). Saml2 plugin should point to that URL again, with HTTP GET method, expecting an unscoped token. :param session: a session object to send out HTTP requests. """ self.saml2_idp_authn_response[0][0] = self.relay_state response = session.post( self.idp_response_consumer_url, headers=self.ECP_SP_SAML2_REQUEST_HEADERS, data=etree.tostring(self.saml2_idp_authn_response), authenticated=False, redirect=False) # Don't follow HTTP specs - after the HTTP 302/303 response don't # repeat the call directed to the Location URL. In this case, this is # an indication that saml2 session is now active and protected resource # can be accessed. response = self._handle_http_ecp_redirect( session, response, method='GET', headers=self.ECP_SP_SAML2_REQUEST_HEADERS) self.authenticated_response = response def _get_unscoped_token(self, session): """Get unscoped OpenStack token after federated authentication. This is a multi-step process including multiple HTTP requests. The federated authentication consists of:: * HTTP GET request to the Identity Service (acting as a Service Provider). Client utilizes URL:: ``/v3/OS-FEDERATION/identity_providers/{identity_provider}/ protocols/saml2/auth``. It's crucial to include HTTP headers indicating we are expecting SOAP message in return. Service Provider should respond with such SOAP message. This step is handed by a method ``Saml2UnscopedToken_send_service_provider_request()`` * HTTP POST request to the external Identity Provider service with ECP extension enabled. The content sent is a header removed SOAP message returned from the Service Provider. It's also worth noting that ECP extension to the SAML2 doesn't define authentication method. The most popular is HttpBasicAuth with just user and password. Other possibilities could be X509 certificates or Kerberos. Upon successful authentication the user should receive a SAML2 assertion. This step is handed by a method ``Saml2UnscopedToken_send_idp_saml2_authn_request(session)`` * HTTP POST request again to the Service Provider. The body of the request includes SAML2 assertion issued by a trusted Identity Provider. The request should be sent to the Service Provider consumer url specified in the SAML2 assertion. Providing the authentication was successful and both Service Provider and Identity Providers are trusted to each other, the Service Provider will issue an unscoped token with a list of groups the federated user is a member of. This step is handed by a method ``Saml2UnscopedToken_send_service_provider_saml2_authn_response()`` Unscoped token example:: { "token": { "methods": [ "saml2" ], "user": { "id": "username%40example.com", "name": "username@example.com", "OS-FEDERATION": { "identity_provider": "ACME", "protocol": "saml2", "groups": [ {"id": "abc123"}, {"id": "bcd234"} ] } } } } :param session : a session object to send out HTTP requests. :type session: keystoneclient.session.Session :returns: (token, token_json) """ saml_authenticated = self._send_service_provider_request(session) if not saml_authenticated: self._send_idp_saml2_authn_request(session) self._send_service_provider_saml2_authn_response(session) return (self.authenticated_response.headers['X-Subject-Token'], self.authenticated_response.json()['token']) def get_auth_ref(self, session, **kwargs): """Authenticate via SAML2 protocol and retrieve unscoped token. This is a multi-step process where a client does federated authn receives an unscoped token. Federated authentication utilizing SAML2 Enhanced Client or Proxy extension. See ``Saml2UnscopedToken_get_unscoped_token()`` for more information on that step. Upon successful authentication and assertion mapping an unscoped token is returned and stored within the plugin object for further use. :param session : a session object to send out HTTP requests. :type session: keystoneclient.session.Session :return: an object with scoped token's id and unscoped token json included. :rtype: :py:class:`keystoneclient.access.AccessInfoV3` """ token, token_json = self._get_unscoped_token(session) return access.AccessInfoV3(token, **token_json) class ADFSUnscopedToken(_BaseSAMLPlugin): """Authentication plugin for Microsoft ADFS2.0 IdPs. :param auth_url: URL of the Identity Service :type auth_url: string :param identity_provider: name of the Identity Provider the client will authenticate against. This parameter will be used to build a dynamic URL used to obtain unscoped OpenStack token. :type identity_provider: string :param identity_provider_url: An Identity Provider URL, where the SAML2 authentication request will be sent. :type identity_provider_url: string :param service_provider_endpoint: Endpoint where an assertion is being sent, for instance: ``https://host.domain/Shibboleth.sso/ADFS`` :type service_provider_endpoint: string :param username: User's login :type username: string :param password: User's password :type password: string """ _auth_method_class = Saml2UnscopedTokenAuthMethod DEFAULT_ADFS_TOKEN_EXPIRATION = 120 HEADER_SOAP = {"Content-Type": "application/soap+xml; charset=utf-8"} HEADER_X_FORM = {"Content-Type": "application/x-www-form-urlencoded"} NAMESPACES = { 's': 'http://www.w3.org/2003/05/soap-envelope', 'a': 'http://www.w3.org/2005/08/addressing', 'u': ('http://docs.oasis-open.org/wss/2004/01/oasis-200401-' 'wss-wssecurity-utility-1.0.xsd') } ADFS_TOKEN_NAMESPACES = { 's': 'http://www.w3.org/2003/05/soap-envelope', 't': 'http://docs.oasis-open.org/ws-sx/ws-trust/200512' } ADFS_ASSERTION_XPATH = ('/s:Envelope/s:Body' '/t:RequestSecurityTokenResponseCollection' '/t:RequestSecurityTokenResponse') def __init__(self, auth_url, identity_provider, identity_provider_url, service_provider_endpoint, username, password, **kwargs): super(ADFSUnscopedToken, self).__init__(auth_url=auth_url, **kwargs) self.identity_provider = identity_provider self.identity_provider_url = identity_provider_url self.service_provider_endpoint = service_provider_endpoint self._username, self._password = username, password @property def username(self): # Override to remove deprecation. return self._username @username.setter def username(self, value): # Override to remove deprecation. self._username = value @property def password(self): # Override to remove deprecation. return self._password @password.setter def password(self, value): # Override to remove deprecation. self._password = value @classmethod def get_options(cls): options = super(ADFSUnscopedToken, cls).get_options() options.extend([ cfg.StrOpt('service-provider-endpoint', help="Service Provider's Endpoint") ]) return options def _cookies(self, session): """Check if cookie jar is not empty. keystoneclient.session.Session object doesn't have a cookies attribute. We should then try fetching cookies from the underlying requests.Session object. If that fails too, there is something wrong and let Python raise the AttributeError. :param session :returns: True if cookie jar is nonempty, False otherwise :raises AttributeError: in case cookies are not find anywhere """ try: return bool(session.cookies) except AttributeError: # nosec(cjschaef): fetch cookies from # underylying requests.Session object, or fail trying pass return bool(session.session.cookies) def _token_dates(self, fmt='%Y-%m-%dT%H:%M:%S.%fZ'): """Calculate created and expires datetime objects. The method is going to be used for building ADFS Request Security Token message. Time interval between ``created`` and ``expires`` dates is now static and equals to 120 seconds. ADFS security tokens should not be live too long, as currently ``keystoneclient`` doesn't have mechanisms for reusing such tokens (every time ADFS authn method is called, keystoneclient will login with the ADFS instance). :param fmt: Datetime format for specifying string format of a date. It should not be changed if the method is going to be used for building the ADFS security token request. :type fmt: string """ date_created = datetime.datetime.utcnow() date_expires = date_created + datetime.timedelta( seconds=self.DEFAULT_ADFS_TOKEN_EXPIRATION) return [_time.strftime(fmt) for _time in (date_created, date_expires)] def _prepare_adfs_request(self): """Build the ADFS Request Security Token SOAP message. Some values like username or password are inserted in the request. """ WSS_SECURITY_NAMESPACE = { 'o': ('http://docs.oasis-open.org/wss/2004/01/oasis-200401-' 'wss-wssecurity-secext-1.0.xsd') } TRUST_NAMESPACE = { 'trust': 'http://docs.oasis-open.org/ws-sx/ws-trust/200512' } WSP_NAMESPACE = { 'wsp': 'http://schemas.xmlsoap.org/ws/2004/09/policy' } WSA_NAMESPACE = { 'wsa': 'http://www.w3.org/2005/08/addressing' } root = etree.Element( '{http://www.w3.org/2003/05/soap-envelope}Envelope', nsmap=self.NAMESPACES) header = etree.SubElement( root, '{http://www.w3.org/2003/05/soap-envelope}Header') action = etree.SubElement( header, "{http://www.w3.org/2005/08/addressing}Action") action.set( "{http://www.w3.org/2003/05/soap-envelope}mustUnderstand", "1") action.text = ('http://docs.oasis-open.org/ws-sx/ws-trust/200512' '/RST/Issue') messageID = etree.SubElement( header, '{http://www.w3.org/2005/08/addressing}MessageID') messageID.text = 'urn:uuid:' + uuid.uuid4().hex replyID = etree.SubElement( header, '{http://www.w3.org/2005/08/addressing}ReplyTo') address = etree.SubElement( replyID, '{http://www.w3.org/2005/08/addressing}Address') address.text = 'http://www.w3.org/2005/08/addressing/anonymous' to = etree.SubElement( header, '{http://www.w3.org/2005/08/addressing}To') to.set("{http://www.w3.org/2003/05/soap-envelope}mustUnderstand", "1") security = etree.SubElement( header, '{http://docs.oasis-open.org/wss/2004/01/oasis-200401-' 'wss-wssecurity-secext-1.0.xsd}Security', nsmap=WSS_SECURITY_NAMESPACE) security.set( "{http://www.w3.org/2003/05/soap-envelope}mustUnderstand", "1") timestamp = etree.SubElement( security, ('{http://docs.oasis-open.org/wss/2004/01/oasis-200401-' 'wss-wssecurity-utility-1.0.xsd}Timestamp')) timestamp.set( ('{http://docs.oasis-open.org/wss/2004/01/oasis-200401-' 'wss-wssecurity-utility-1.0.xsd}Id'), '_0') created = etree.SubElement( timestamp, ('{http://docs.oasis-open.org/wss/2004/01/oasis-200401-' 'wss-wssecurity-utility-1.0.xsd}Created')) expires = etree.SubElement( timestamp, ('{http://docs.oasis-open.org/wss/2004/01/oasis-200401-' 'wss-wssecurity-utility-1.0.xsd}Expires')) created.text, expires.text = self._token_dates() usernametoken = etree.SubElement( security, '{http://docs.oasis-open.org/wss/2004/01/oasis-200401-' 'wss-wssecurity-secext-1.0.xsd}UsernameToken') usernametoken.set( ('{http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-' 'wssecurity-utility-1.0.xsd}u'), "uuid-%s-1" % uuid.uuid4().hex) username = etree.SubElement( usernametoken, ('{http://docs.oasis-open.org/wss/2004/01/oasis-' '200401-wss-wssecurity-secext-1.0.xsd}Username')) password = etree.SubElement( usernametoken, ('{http://docs.oasis-open.org/wss/2004/01/oasis-' '200401-wss-wssecurity-secext-1.0.xsd}Password'), Type=('http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-' 'username-token-profile-1.0#PasswordText')) body = etree.SubElement( root, "{http://www.w3.org/2003/05/soap-envelope}Body") request_security_token = etree.SubElement( body, ('{http://docs.oasis-open.org/ws-sx/ws-trust/200512}' 'RequestSecurityToken'), nsmap=TRUST_NAMESPACE) applies_to = etree.SubElement( request_security_token, '{http://schemas.xmlsoap.org/ws/2004/09/policy}AppliesTo', nsmap=WSP_NAMESPACE) endpoint_reference = etree.SubElement( applies_to, '{http://www.w3.org/2005/08/addressing}EndpointReference', nsmap=WSA_NAMESPACE) wsa_address = etree.SubElement( endpoint_reference, '{http://www.w3.org/2005/08/addressing}Address') keytype = etree.SubElement( request_security_token, '{http://docs.oasis-open.org/ws-sx/ws-trust/200512}KeyType') keytype.text = ('http://docs.oasis-open.org/ws-sx/' 'ws-trust/200512/Bearer') request_type = etree.SubElement( request_security_token, '{http://docs.oasis-open.org/ws-sx/ws-trust/200512}RequestType') request_type.text = ('http://docs.oasis-open.org/ws-sx/' 'ws-trust/200512/Issue') token_type = etree.SubElement( request_security_token, '{http://docs.oasis-open.org/ws-sx/ws-trust/200512}TokenType') token_type.text = 'urn:oasis:names:tc:SAML:1.0:assertion' # After constructing the request, let's plug in some values username.text = self.username password.text = self.password to.text = self.identity_provider_url wsa_address.text = self.service_provider_endpoint self.prepared_request = root def _get_adfs_security_token(self, session): """Send ADFS Security token to the ADFS server. Store the result in the instance attribute and raise an exception in case the response is not valid XML data. If a user cannot authenticate due to providing bad credentials, the ADFS2.0 server will return a HTTP 500 response and a XML Fault message. If ``exceptions.InternalServerError`` is caught, the method tries to parse the XML response. If parsing is unsuccessful, an ``exceptions.AuthorizationFailure`` is raised with a reason from the XML fault. Otherwise an original ``exceptions.InternalServerError`` is re-raised. :param session : a session object to send out HTTP requests. :type session: keystoneclient.session.Session :raises keystoneclient.exceptions.AuthorizationFailure: when HTTP response from the ADFS server is not a valid XML ADFS security token. :raises keystoneclient.exceptions.InternalServerError: If response status code is HTTP 500 and the response XML cannot be recognized. """ def _get_failure(e): xpath = '/s:Envelope/s:Body/s:Fault/s:Code/s:Subcode/s:Value' content = e.response.content try: obj = self.str_to_xml(content).xpath( xpath, namespaces=self.NAMESPACES) obj = self._first(obj) return obj.text # NOTE(marek-denis): etree.Element.xpath() doesn't raise an # exception, it just returns an empty list. In that case, _first() # will raise IndexError and we should treat it as an indication XML # is not valid. exceptions.AuthorizationFailure can be raised from # str_to_xml(), however since server returned HTTP 500 we should # re-raise exceptions.InternalServerError. except (IndexError, exceptions.AuthorizationFailure): raise e request_security_token = self.xml_to_str(self.prepared_request) try: response = session.post( url=self.identity_provider_url, headers=self.HEADER_SOAP, data=request_security_token, authenticated=False) except exceptions.InternalServerError as e: reason = _get_failure(e) raise exceptions.AuthorizationFailure(reason) msg = _("Error parsing XML returned from " "the ADFS Identity Provider, reason: %s") self.adfs_token = self.str_to_xml(response.content, msg) def _prepare_sp_request(self): """Prepare ADFS Security Token to be sent to the Service Provider. The method works as follows: * Extract SAML2 assertion from the ADFS Security Token. * Replace namespaces * urlencode assertion * concatenate static string with the encoded assertion """ assertion = self.adfs_token.xpath( self.ADFS_ASSERTION_XPATH, namespaces=self.ADFS_TOKEN_NAMESPACES) assertion = self._first(assertion) assertion = self.xml_to_str(assertion) # TODO(marek-denis): Ideally no string replacement should occur. # Unfortunately lxml doesn't allow for namespaces changing in-place and # probably the only solution good for now is to build the assertion # from scratch and reuse values from the adfs security token. assertion = assertion.replace( b'http://docs.oasis-open.org/ws-sx/ws-trust/200512', b'http://schemas.xmlsoap.org/ws/2005/02/trust') encoded_assertion = urllib.parse.quote(assertion) self.encoded_assertion = 'wa=wsignin1.0&wresult=' + encoded_assertion def _send_assertion_to_service_provider(self, session): """Send prepared assertion to a service provider. As the assertion doesn't contain a protected resource, the value from the ``location`` header is not valid and we should not let the Session object get redirected there. The aim of this call is to get a cookie in the response which is required for entering a protected endpoint. :param session : a session object to send out HTTP requests. :type session: keystoneclient.session.Session :raises: Corresponding HTTP error exception """ session.post( url=self.service_provider_endpoint, data=self.encoded_assertion, headers=self.HEADER_X_FORM, redirect=False, authenticated=False) def _access_service_provider(self, session): """Access protected endpoint and fetch unscoped token. After federated authentication workflow a protected endpoint should be accessible with the session object. The access is granted basing on the cookies stored within the session object. If, for some reason no cookies are present (quantity test) it means something went wrong and user will not be able to fetch an unscoped token. In that case an ``exceptions.AuthorizationFailure` exception is raised and no HTTP call is even made. :param session : a session object to send out HTTP requests. :type session: keystoneclient.session.Session :raises keystoneclient.exceptions.AuthorizationFailure: in case session object has empty cookie jar. """ if self._cookies(session) is False: raise exceptions.AuthorizationFailure( _("Session object doesn't contain a cookie, therefore you are " "not allowed to enter the Identity Provider's protected " "area.")) self.authenticated_response = session.get(self.token_url, authenticated=False) def _get_unscoped_token(self, session, *kwargs): """Retrieve unscoped token after authentcation with ADFS server. This is a multistep process:: * Prepare ADFS Request Securty Token - build an etree.XML object filling certain attributes with proper user credentials, created/expires dates (ticket is be valid for 120 seconds as currently we don't handle reusing ADFS issued security tokens) . Step handled by ``ADFSUnscopedToken._prepare_adfs_request()`` method. * Send ADFS Security token to the ADFS server. Step handled by ``ADFSUnscopedToken._get_adfs_security_token()`` method. * Receive and parse security token, extract actual SAML assertion and prepare a request addressed for the Service Provider endpoint. This also includes changing namespaces in the XML document. Step handled by ``ADFSUnscopedToken._prepare_sp_request()`` method. * Send prepared assertion to the Service Provider endpoint. Usually the server will respond with HTTP 301 code which should be ignored as the 'location' header doesn't contain protected area. The goal of this operation is fetching the session cookie which later allows for accessing protected URL endpoints. Step handed by ``ADFSUnscopedToken._send_assertion_to_service_provider()`` method. * Once the session cookie is issued, the protected endpoint can be accessed and an unscoped token can be retrieved. Step handled by ``ADFSUnscopedToken._access_service_provider()`` method. :param session : a session object to send out HTTP requests. :type session: keystoneclient.session.Session :returns: (Unscoped federated token, token JSON body) """ self._prepare_adfs_request() self._get_adfs_security_token(session) self._prepare_sp_request() self._send_assertion_to_service_provider(session) self._access_service_provider(session) try: return (self.authenticated_response.headers['X-Subject-Token'], self.authenticated_response.json()['token']) except (KeyError, ValueError): raise exceptions.InvalidResponse( response=self.authenticated_response) def get_auth_ref(self, session, **kwargs): token, token_json = self._get_unscoped_token(session) return access.AccessInfoV3(token, **token_json) class Saml2ScopedTokenMethod(v3.TokenMethod): _method_name = 'saml2' def get_auth_data(self, session, auth, headers, **kwargs): """Build and return request body for token scoping step.""" t = super(Saml2ScopedTokenMethod, self).get_auth_data( session, auth, headers, **kwargs) _token_method, token = t return self._method_name, token class Saml2ScopedToken(v3.Token): """Class for scoping unscoped saml2 token.""" _auth_method_class = Saml2ScopedTokenMethod def __init__(self, auth_url, token, **kwargs): super(Saml2ScopedToken, self).__init__(auth_url, token, **kwargs) if not (self.project_id or self.domain_id): raise exceptions.ValidationError( _('Neither project nor domain specified'))