686 lines
27 KiB
Python
686 lines
27 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2009-2011 Umeå University
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Contains classes and functions that a SAML2.0 Identity provider (IdP)
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or attribute authority (AA) may use to conclude its tasks.
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"""
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import logging
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import os
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import shelve
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import threading
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from saml2.eptid import EptidShelve, Eptid
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from saml2.saml import EncryptedAssertion
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from saml2.sdb import SessionStorage
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from saml2.schema import soapenv
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from saml2.samlp import NameIDMappingResponse
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from saml2.entity import Entity
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from saml2 import saml, element_to_extension_element
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from saml2 import class_name
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from saml2 import BINDING_HTTP_REDIRECT
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from saml2.request import AuthnRequest
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from saml2.request import AssertionIDRequest
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from saml2.request import AttributeQuery
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from saml2.request import NameIDMappingRequest
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from saml2.request import AuthzDecisionQuery
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from saml2.request import AuthnQuery
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from saml2.s_utils import MissingValue, Unknown, rndstr
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from saml2.sigver import pre_signature_part, signed_instance_factory, CertificateError, CryptoBackendXmlSec1
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from saml2.assertion import Assertion
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from saml2.assertion import Policy
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from saml2.assertion import restriction_from_attribute_spec
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from saml2.assertion import filter_attribute_value_assertions
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from saml2.ident import IdentDB
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from saml2.profile import ecp
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logger = logging.getLogger(__name__)
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AUTHN_DICT_MAP = {
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"decl": "authn_decl",
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"authn_auth": "authn_auth",
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"class_ref": "authn_class",
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"authn_instant": "authn_instant",
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"subject_locality": "subject_locality"
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}
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class Server(Entity):
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""" A class that does things that IdPs or AAs do """
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def __init__(self, config_file="", config=None, cache=None, stype="idp",
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symkey=""):
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Entity.__init__(self, stype, config, config_file)
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self.eptid = None
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self.init_config(stype)
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self.cache = cache
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self.ticket = {}
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#
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self.session_db = self.choose_session_storage()
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# Needed for
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self.symkey = symkey
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self.seed = rndstr()
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self.iv = os.urandom(16)
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self.lock = threading.Lock()
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def getvalid_certificate_str(self):
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if self.sec.cert_handler is not None:
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return self.sec.cert_handler._last_validated_cert
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return None
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def support_AssertionIDRequest(self):
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return True
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def support_AuthnQuery(self):
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return True
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def choose_session_storage(self):
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_spec = self.config.getattr("session_storage", "idp")
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if not _spec:
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return SessionStorage()
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elif isinstance(_spec, basestring):
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if _spec.lower() == "memory":
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return SessionStorage()
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else: # Should be tuple
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typ, data = _spec
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if typ.lower() == "mongodb":
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from saml2.mongo_store import SessionStorageMDB
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return SessionStorageMDB(database=data, collection="session")
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raise NotImplementedError("No such storage type implemented")
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def init_config(self, stype="idp"):
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""" Remaining init of the server configuration
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:param stype: The type of Server ("idp"/"aa")
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"""
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if stype == "aa":
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return
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# subject information is stored in a database
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# default database is in memory which is OK in some setups
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dbspec = self.config.getattr("subject_data", "idp")
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idb = None
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typ = ""
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if not dbspec:
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idb = {}
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elif isinstance(dbspec, basestring):
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idb = shelve.open(dbspec, writeback=True)
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else: # database spec is a a 2-tuple (type, address)
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#print >> sys.stderr, "DBSPEC: %s" % (dbspec,)
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(typ, addr) = dbspec
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if typ == "shelve":
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idb = shelve.open(addr, writeback=True)
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elif typ == "memcached":
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import memcache
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idb = memcache.Client(addr)
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elif typ == "dict": # in-memory dictionary
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idb = {}
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elif typ == "mongodb":
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from saml2.mongo_store import IdentMDB
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self.ident = IdentMDB(database=addr, collection="ident")
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if typ == "mongodb":
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pass
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elif idb is not None:
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self.ident = IdentDB(idb)
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elif dbspec:
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raise Exception("Couldn't open identity database: %s" %
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(dbspec,))
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_domain = self.config.getattr("domain", "idp")
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if _domain:
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self.ident.domain = _domain
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self.ident.name_qualifier = self.config.entityid
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dbspec = self.config.getattr("edu_person_targeted_id", "idp")
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if not dbspec:
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pass
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else:
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typ = dbspec[0]
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addr = dbspec[1]
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secret = dbspec[2]
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if typ == "shelve":
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self.eptid = EptidShelve(secret, addr)
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elif typ == "mongodb":
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from saml2.mongo_store import EptidMDB
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self.eptid = EptidMDB(secret, database=addr,
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collection="eptid")
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else:
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self.eptid = Eptid(secret)
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def wants(self, sp_entity_id, index=None):
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""" Returns what attributes the SP requires and which are optional
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if any such demands are registered in the Metadata.
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:param sp_entity_id: The entity id of the SP
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:param index: which of the attribute consumer services its all about
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:return: 2-tuple, list of required and list of optional attributes
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"""
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return self.metadata.attribute_requirement(sp_entity_id, index)
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def verify_assertion_consumer_service(self, request):
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_acs = request.assertion_consumer_service_url
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_aci = request.assertion_consumer_service_index
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_binding = request.protocol_binding
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_eid = request.issuer.text
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if _acs:
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# look up acs in for that binding in the metadata given the issuer
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# Assuming the format is entity
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for acs in self.metadata.assertion_consumer_service(_eid, _binding):
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if _acs == acs.text:
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return True
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elif _aci:
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for acs in self.metadata.assertion_consumer_service(_eid, _binding):
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if _aci == acs.index:
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return True
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return False
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# -------------------------------------------------------------------------
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def parse_authn_request(self, enc_request, binding=BINDING_HTTP_REDIRECT):
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"""Parse a Authentication Request
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:param enc_request: The request in its transport format
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:param binding: Which binding that was used to transport the message
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to this entity.
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:return: A dictionary with keys:
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consumer_url - as gotten from the SPs entity_id and the metadata
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id - the id of the request
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sp_entity_id - the entity id of the SP
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request - The verified request
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"""
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return self._parse_request(enc_request, AuthnRequest,
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"single_sign_on_service", binding)
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def parse_attribute_query(self, xml_string, binding):
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""" Parse an attribute query
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:param xml_string: The Attribute Query as an XML string
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:param binding: Which binding that was used for the request
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:return: A query instance
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"""
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return self._parse_request(xml_string, AttributeQuery,
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"attribute_service", binding)
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def parse_authz_decision_query(self, xml_string, binding):
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""" Parse an authorization decision query
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:param xml_string: The Authz decision Query as an XML string
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:param binding: Which binding that was used when receiving this query
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:return: Query instance
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"""
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return self._parse_request(xml_string, AuthzDecisionQuery,
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"authz_service", binding)
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def parse_assertion_id_request(self, xml_string, binding):
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""" Parse an assertion id query
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:param xml_string: The AssertionIDRequest as an XML string
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:param binding: Which binding that was used when receiving this request
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:return: Query instance
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"""
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return self._parse_request(xml_string, AssertionIDRequest,
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"assertion_id_request_service", binding)
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def parse_authn_query(self, xml_string, binding):
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""" Parse an authn query
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:param xml_string: The AuthnQuery as an XML string
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:param binding: Which binding that was used when receiving this query
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:return: Query instance
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"""
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return self._parse_request(xml_string, AuthnQuery,
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"authn_query_service", binding)
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def parse_name_id_mapping_request(self, xml_string, binding):
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""" Parse a nameid mapping request
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:param xml_string: The NameIDMappingRequest as an XML string
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:param binding: Which binding that was used when receiving this request
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:return: Query instance
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"""
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return self._parse_request(xml_string, NameIDMappingRequest,
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"name_id_mapping_service", binding)
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# ------------------------------------------------------------------------
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# ------------------------------------------------------------------------
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def _authn_response(self, in_response_to, consumer_url,
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sp_entity_id, identity=None, name_id=None,
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status=None, authn=None, issuer=None, policy=None,
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sign_assertion=False, sign_response=False,
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best_effort=False, encrypt_assertion=False, encrypt_cert=None):
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""" Create a response. A layer of indirection.
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:param in_response_to: The session identifier of the request
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:param consumer_url: The URL which should receive the response
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:param sp_entity_id: The entity identifier of the SP
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:param identity: A dictionary with attributes and values that are
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expected to be the bases for the assertion in the response.
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:param name_id: The identifier of the subject
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:param status: The status of the response
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:param authn: A dictionary containing information about the
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authn context.
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:param issuer: The issuer of the response
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:param sign_assertion: Whether the assertion should be signed or not
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:param sign_response: Whether the response should be signed or not
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:param best_effort: Even if not the SPs demands can be met send a
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response.
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:return: A response instance
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"""
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to_sign = []
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args = {}
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#if identity:
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_issuer = self._issuer(issuer)
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ast = Assertion(identity)
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if policy is None:
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policy = Policy()
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try:
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ast.apply_policy(sp_entity_id, policy, self.metadata)
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except MissingValue, exc:
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if not best_effort:
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return self.create_error_response(in_response_to, consumer_url,
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exc, sign_response)
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if authn: # expected to be a dictionary
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# Would like to use dict comprehension but ...
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authn_args = dict([
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(AUTHN_DICT_MAP[k], v) for k, v in authn.items()
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if k in AUTHN_DICT_MAP])
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assertion = ast.construct(sp_entity_id, in_response_to,
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consumer_url, name_id,
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self.config.attribute_converters,
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policy, issuer=_issuer,
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**authn_args)
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else:
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assertion = ast.construct(sp_entity_id, in_response_to,
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consumer_url, name_id,
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self.config.attribute_converters,
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policy, issuer=_issuer)
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if sign_assertion is not None and sign_assertion:
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assertion.signature = pre_signature_part(assertion.id,
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self.sec.my_cert, 1)
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# Just the assertion or the response and the assertion ?
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to_sign = [(class_name(assertion), assertion.id)]
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# Store which assertion that has been sent to which SP about which
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# subject.
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# self.cache.set(assertion.subject.name_id.text,
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# sp_entity_id, {"ava": identity, "authn": authn},
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# assertion.conditions.not_on_or_after)
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args["assertion"] = assertion
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if self.support_AssertionIDRequest() or self.support_AuthnQuery():
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self.session_db.store_assertion(assertion, to_sign)
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return self._response(in_response_to, consumer_url, status, issuer,
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sign_response, to_sign, encrypt_assertion=encrypt_assertion,
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encrypt_cert=encrypt_cert, **args)
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# ------------------------------------------------------------------------
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#noinspection PyUnusedLocal
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def create_attribute_response(self, identity, in_response_to, destination,
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sp_entity_id, userid="", name_id=None,
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status=None, issuer=None,
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sign_assertion=False, sign_response=False,
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attributes=None, **kwargs):
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""" Create an attribute assertion response.
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:param identity: A dictionary with attributes and values that are
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expected to be the bases for the assertion in the response.
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:param in_response_to: The session identifier of the request
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:param destination: The URL which should receive the response
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:param sp_entity_id: The entity identifier of the SP
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:param userid: A identifier of the user
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:param name_id: The identifier of the subject
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:param status: The status of the response
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:param issuer: The issuer of the response
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:param sign_assertion: Whether the assertion should be signed or not
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:param sign_response: Whether the whole response should be signed
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:param attributes:
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:param kwargs: To catch extra keyword arguments
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:return: A response instance
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"""
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policy = self.config.getattr("policy", "aa")
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if not name_id and userid:
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try:
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name_id = self.ident.construct_nameid(userid, policy,
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sp_entity_id)
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logger.warning("Unspecified NameID format")
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except Exception:
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pass
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to_sign = []
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args = {}
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if identity:
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_issuer = self._issuer(issuer)
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ast = Assertion(identity)
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if policy:
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ast.apply_policy(sp_entity_id, policy, self.metadata)
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else:
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policy = Policy()
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if attributes:
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restr = restriction_from_attribute_spec(attributes)
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ast = filter_attribute_value_assertions(ast)
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assertion = ast.construct(sp_entity_id, in_response_to,
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destination, name_id,
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self.config.attribute_converters,
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policy, issuer=_issuer)
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if sign_assertion:
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assertion.signature = pre_signature_part(assertion.id,
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self.sec.my_cert, 1)
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# Just the assertion or the response and the assertion ?
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to_sign = [(class_name(assertion), assertion.id)]
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args["assertion"] = assertion
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return self._response(in_response_to, destination, status, issuer,
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sign_response, to_sign, **args)
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# ------------------------------------------------------------------------
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def create_authn_response(self, identity, in_response_to, destination,
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sp_entity_id, name_id_policy=None, userid=None,
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name_id=None, authn=None, issuer=None,
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sign_response=None, sign_assertion=None, encrypt_cert=None, encrypt_assertion=None,
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**kwargs):
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""" Constructs an AuthenticationResponse
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:param identity: Information about an user
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:param in_response_to: The identifier of the authentication request
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this response is an answer to.
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:param destination: Where the response should be sent
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:param sp_entity_id: The entity identifier of the Service Provider
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:param name_id_policy: How the NameID should be constructed
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:param userid: The subject identifier
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:param authn: Dictionary with information about the authentication
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context
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:param issuer: Issuer of the response
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:param sign_assertion: Whether the assertion should be signed or not.
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:param sign_response: Whether the response should be signed or not.
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:return: A response instance
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"""
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try:
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policy = kwargs["release_policy"]
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except KeyError:
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policy = self.config.getattr("policy", "idp")
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try:
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best_effort = kwargs["best_effort"]
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except KeyError:
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best_effort = False
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if sign_assertion is None:
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sign_assertion = self.config.getattr("sign_assertion", "idp")
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if sign_assertion is None:
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sign_assertion = False
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if sign_response is None:
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sign_response = self.config.getattr("sign_response", "idp")
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if sign_response is None:
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sign_response = False
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if encrypt_assertion is None:
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encrypt_assertion = self.config.getattr("encrypt_assertion", "idp")
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if encrypt_assertion is None:
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encrypt_assertion = False
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if encrypt_assertion:
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if encrypt_cert is not None:
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verify_encrypt_cert = self.config.getattr("verify_encrypt_cert", "idp")
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if verify_encrypt_cert is not None:
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if not verify_encrypt_cert(encrypt_cert):
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raise CertificateError("Invalid certificate for encryption!")
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else:
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raise CertificateError("No certificate for encryption!")
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else:
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encrypt_assertion = False
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if not name_id:
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try:
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nid_formats = []
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for _sp in self.metadata[sp_entity_id]["spsso_descriptor"]:
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if "name_id_format" in _sp:
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nid_formats.extend([n["text"] for n in
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_sp["name_id_format"]])
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try:
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snq = name_id_policy.sp_name_qualifier
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except AttributeError:
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snq = sp_entity_id
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if not snq:
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snq = sp_entity_id
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kwa = {"sp_name_qualifier": snq}
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try:
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kwa["format"] = name_id_policy.format
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except AttributeError:
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pass
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_nids = self.ident.find_nameid(userid, **kwa)
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# either none or one
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if _nids:
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name_id = _nids[0]
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else:
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name_id = self.ident.construct_nameid(userid, policy,
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sp_entity_id,
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name_id_policy)
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except IOError, exc:
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response = self.create_error_response(in_response_to,
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destination,
|
|
sp_entity_id,
|
|
exc, name_id)
|
|
return ("%s" % response).split("\n")
|
|
|
|
try:
|
|
_authn = authn
|
|
response = None
|
|
if (sign_assertion or sign_response) and self.sec.cert_handler.generate_cert():
|
|
with self.lock:
|
|
self.sec.cert_handler.update_cert(True)
|
|
return self._authn_response(in_response_to, # in_response_to
|
|
destination, # consumer_url
|
|
sp_entity_id, # sp_entity_id
|
|
identity, # identity as dictionary
|
|
name_id,
|
|
authn=_authn,
|
|
issuer=issuer,
|
|
policy=policy,
|
|
sign_assertion=sign_assertion,
|
|
sign_response=sign_response,
|
|
best_effort=best_effort,
|
|
encrypt_assertion=encrypt_assertion, encrypt_cert=encrypt_cert)
|
|
return self._authn_response(in_response_to, # in_response_to
|
|
destination, # consumer_url
|
|
sp_entity_id, # sp_entity_id
|
|
identity, # identity as dictionary
|
|
name_id,
|
|
authn=_authn,
|
|
issuer=issuer,
|
|
policy=policy,
|
|
sign_assertion=sign_assertion,
|
|
sign_response=sign_response,
|
|
best_effort=best_effort,
|
|
encrypt_assertion=encrypt_assertion, encrypt_cert=encrypt_cert)
|
|
|
|
except MissingValue, exc:
|
|
return self.create_error_response(in_response_to, destination,
|
|
sp_entity_id, exc, name_id)
|
|
|
|
def create_authn_request_response(self, identity, in_response_to,
|
|
destination, sp_entity_id,
|
|
name_id_policy=None, userid=None,
|
|
name_id=None, authn=None, authn_decl=None,
|
|
issuer=None, sign_response=False,
|
|
sign_assertion=False, **kwargs):
|
|
|
|
return self.create_authn_response(identity, in_response_to, destination,
|
|
sp_entity_id, name_id_policy, userid,
|
|
name_id, authn, issuer,
|
|
sign_response, sign_assertion,
|
|
authn_decl=authn_decl)
|
|
|
|
#noinspection PyUnusedLocal
|
|
def create_assertion_id_request_response(self, assertion_id, sign=False,
|
|
**kwargs):
|
|
"""
|
|
|
|
:param assertion_id:
|
|
:param sign:
|
|
:return:
|
|
"""
|
|
|
|
try:
|
|
(assertion, to_sign) = self.session_db.get_assertion(assertion_id)
|
|
except KeyError:
|
|
raise Unknown
|
|
|
|
if to_sign:
|
|
if assertion.signature is None:
|
|
assertion.signature = pre_signature_part(assertion.id,
|
|
self.sec.my_cert, 1)
|
|
|
|
return signed_instance_factory(assertion, self.sec, to_sign)
|
|
else:
|
|
return assertion
|
|
|
|
#noinspection PyUnusedLocal
|
|
def create_name_id_mapping_response(self, name_id=None, encrypted_id=None,
|
|
in_response_to=None,
|
|
issuer=None, sign_response=False,
|
|
status=None, **kwargs):
|
|
"""
|
|
protocol for mapping a principal's name identifier into a
|
|
different name identifier for the same principal.
|
|
Done over soap.
|
|
|
|
:param name_id:
|
|
:param encrypted_id:
|
|
:param in_response_to:
|
|
:param issuer:
|
|
:param sign_response:
|
|
:param status:
|
|
:return:
|
|
"""
|
|
# Done over SOAP
|
|
|
|
ms_args = self.message_args()
|
|
|
|
_resp = NameIDMappingResponse(name_id, encrypted_id,
|
|
in_response_to=in_response_to, **ms_args)
|
|
|
|
if sign_response:
|
|
return self.sign(_resp)
|
|
else:
|
|
logger.info("Message: %s" % _resp)
|
|
return _resp
|
|
|
|
def create_authn_query_response(self, subject, session_index=None,
|
|
requested_context=None, in_response_to=None,
|
|
issuer=None, sign_response=False,
|
|
status=None, **kwargs):
|
|
"""
|
|
A successful <Response> will contain one or more assertions containing
|
|
authentication statements.
|
|
|
|
:return:
|
|
"""
|
|
|
|
margs = self.message_args()
|
|
asserts = []
|
|
for statement in self.session_db.get_authn_statements(
|
|
subject.name_id, session_index, requested_context):
|
|
asserts.append(saml.Assertion(authn_statement=statement,
|
|
subject=subject, **margs))
|
|
|
|
if asserts:
|
|
args = {"assertion": asserts}
|
|
else:
|
|
args = {}
|
|
|
|
return self._response(in_response_to, "", status, issuer,
|
|
sign_response, to_sign=[], **args)
|
|
|
|
# ---------
|
|
|
|
def parse_ecp_authn_request(self):
|
|
pass
|
|
|
|
def create_ecp_authn_request_response(self, acs_url, identity,
|
|
in_response_to, destination,
|
|
sp_entity_id, name_id_policy=None,
|
|
userid=None, name_id=None, authn=None,
|
|
issuer=None, sign_response=False,
|
|
sign_assertion=False, **kwargs):
|
|
|
|
# ----------------------------------------
|
|
# <ecp:Response
|
|
# ----------------------------------------
|
|
|
|
ecp_response = ecp.Response(assertion_consumer_service_url=acs_url)
|
|
header = soapenv.Header()
|
|
header.extension_elements = [element_to_extension_element(ecp_response)]
|
|
|
|
# ----------------------------------------
|
|
# <samlp:Response
|
|
# ----------------------------------------
|
|
|
|
response = self.create_authn_response(identity, in_response_to,
|
|
destination, sp_entity_id,
|
|
name_id_policy, userid, name_id,
|
|
authn, issuer,
|
|
sign_response, sign_assertion)
|
|
body = soapenv.Body()
|
|
body.extension_elements = [element_to_extension_element(response)]
|
|
|
|
soap_envelope = soapenv.Envelope(header=header, body=body)
|
|
|
|
return "%s" % soap_envelope
|