682 lines
27 KiB
Python
682 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 shelve
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import sys
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import memcache
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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
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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 sid
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from saml2.s_utils import MissingValue
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from saml2.s_utils import error_status_factory
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from saml2.sigver import pre_signature_part
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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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logger = logging.getLogger(__name__)
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class UnknownVO(Exception):
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pass
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def context_match(cfilter, cntx):
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return True
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class Identifier(object):
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""" A class that handles identifiers of objects """
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def __init__(self, db, voconf=None):
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if isinstance(db, basestring):
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self.map = shelve.open(db, writeback=True)
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else:
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self.map = db
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self.voconf = voconf
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def _store(self, typ, entity_id, local, remote):
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self.map["|".join([typ, entity_id, "f", local])] = remote
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self.map["|".join([typ, entity_id, "b", remote])] = local
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def _get_remote(self, typ, entity_id, local):
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return self.map["|".join([typ, entity_id, "f", local])]
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def _get_local(self, typ, entity_id, remote):
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return self.map["|".join([typ, entity_id, "b", remote])]
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def persistent(self, entity_id, subject_id):
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""" Keeps the link between a permanent identifier and a
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temporary/pseudo-temporary identifier for a subject
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The store supports look-up both ways: from a permanent local
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identifier to a identifier used talking to a SP and from an
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identifier given back by an SP to the local permanent.
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:param entity_id: SP entity ID or VO entity ID
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:param subject_id: The local permanent identifier of the subject
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:return: An arbitrary identifier for the subject unique to the
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service/group of services/VO with a given entity_id
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"""
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try:
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return self._get_remote("persistent", entity_id, subject_id)
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except KeyError:
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temp_id = "xyz"
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while True:
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temp_id = sid()
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try:
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self._get_local("persistent", entity_id, temp_id)
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except KeyError:
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break
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self._store("persistent", entity_id, subject_id, temp_id)
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self.map.sync()
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return temp_id
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def _get_vo_identifier(self, sp_name_qualifier, identity):
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try:
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vo = self.voconf[sp_name_qualifier]
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try:
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subj_id = identity[vo.common_identifier]
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except KeyError:
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raise MissingValue("Common identifier")
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except (KeyError, TypeError):
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raise UnknownVO("%s" % sp_name_qualifier)
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nameid_format = vo.nameid_format
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if not nameid_format:
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nameid_format = saml.NAMEID_FORMAT_PERSISTENT
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return saml.NameID(format=nameid_format,
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sp_name_qualifier=sp_name_qualifier,
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text=subj_id)
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def persistent_nameid(self, sp_name_qualifier, userid):
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""" Get or create a persistent identifier for this object to be used
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when communicating with servers using a specific SPNameQualifier
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:param sp_name_qualifier: An identifier for a 'context'
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:param userid: The local permanent identifier of the object
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:return: A persistent random identifier.
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"""
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subj_id = self.persistent(sp_name_qualifier, userid)
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return saml.NameID(format=saml.NAMEID_FORMAT_PERSISTENT,
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sp_name_qualifier=sp_name_qualifier,
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text=subj_id)
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def transient_nameid(self, sp_entity_id, userid):
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""" Returns a random one-time identifier. One-time means it is
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kept around as long as the session is active.
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:param sp_entity_id: A qualifier to bind the created identifier to
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:param userid: The local persistent identifier for the subject.
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:return: The created identifier,
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"""
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temp_id = sid()
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while True:
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try:
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_ = self._get_local("transient", sp_entity_id, temp_id)
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temp_id = sid()
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except KeyError:
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break
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self._store("transient", sp_entity_id, userid, temp_id)
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self.map.sync()
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return saml.NameID(format=saml.NAMEID_FORMAT_TRANSIENT,
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sp_name_qualifier=sp_entity_id,
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text=temp_id)
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def email_nameid(self, sp_name_qualifier, userid):
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return saml.NameID(format=saml.NAMEID_FORMAT_EMAILADDRESS,
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sp_name_qualifier=sp_name_qualifier,
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text=userid)
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def construct_nameid(self, local_policy, userid, sp_entity_id,
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identity=None, name_id_policy=None, sp_nid=None):
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""" Returns a name_id for the object. How the name_id is
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constructed depends on the context.
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:param local_policy: The policy the server is configured to follow
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:param userid: The local permanent identifier of the object
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:param sp_entity_id: The 'user' of the name_id
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:param identity: Attribute/value pairs describing the object
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:param name_id_policy: The policy the server on the other side wants
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us to follow.
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:param sp_nid: Name ID Formats from the SPs metadata
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:return: NameID instance precursor
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"""
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if name_id_policy and name_id_policy.sp_name_qualifier:
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try:
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return self._get_vo_identifier(name_id_policy.sp_name_qualifier,
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identity)
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except Exception, exc:
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print >> sys.stderr, "%s:%s" % (exc.__class__.__name__, exc)
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if name_id_policy:
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nameid_format = name_id_policy.format
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elif sp_nid:
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nameid_format = sp_nid[0]
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elif local_policy:
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nameid_format = local_policy.get_nameid_format(sp_entity_id)
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else:
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raise Exception("Unknown NameID format")
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if nameid_format == saml.NAMEID_FORMAT_PERSISTENT:
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return self.persistent_nameid(sp_entity_id, userid)
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elif nameid_format == saml.NAMEID_FORMAT_TRANSIENT:
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return self.transient_nameid(sp_entity_id, userid)
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elif nameid_format == saml.NAMEID_FORMAT_EMAILADDRESS:
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return self.email_nameid(sp_entity_id, userid)
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def local_name(self, entity_id, remote_id):
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""" Get the local persistent name that has the specified remote ID.
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:param entity_id: The identifier of the entity that got the remote id
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:param remote_id: The identifier that was exported
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:return: Local identifier
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"""
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try:
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return self._get_local("persistent", entity_id, remote_id)
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except KeyError:
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try:
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return self._get_local("transient", entity_id, remote_id)
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except KeyError:
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return None
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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="", stype="idp"):
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Entity.__init__(self, stype, config, config_file)
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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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self.authn = {}
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self.assertion = {}
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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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try:
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# subject information is stored in a database
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# default database is a shelve database 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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if 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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idb = memcache.Client(addr)
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elif typ == "dict": # in-memory dictionary
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idb = addr
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if idb is not None:
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self.ident = Identifier(idb, self.config.virtual_organization)
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else:
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raise Exception("Couldn't open identity database: %s" %
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(dbspec,))
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except AttributeError:
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self.ident = None
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def close_shelve_db(self):
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"""Close the shelve db to prevent file system locking issues"""
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if self.ident:
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self.ident.map.close()
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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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# -------------------------------------------------------------------------
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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 attribute query
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:param xml_string: The Authz decision Query as an XML string
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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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: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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: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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:return: Query instance
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"""
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return self._parse_request(xml_string, NameIDMappingRequest,
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"manage_name_id_service", binding)
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# ------------------------------------------------------------------------
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def store_assertion(self, assertion, to_sign):
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self.assertion[assertion.id] = (assertion, to_sign)
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def get_assertion(self, id):
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return self.assertion[id]
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def store_authn_statement(self, authn_statement, name_id):
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try:
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self.authn[name_id.text].append(authn_statement)
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except:
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self.authn[name_id.text] = [authn_statement]
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def get_authn_statements(self, subject, session_index=None,
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requested_context=None):
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result = []
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for statement in self.authn[subject.name_id.text]:
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if session_index:
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if statement.session_index != session_index:
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continue
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if requested_context:
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if not context_match(requested_context, statement.authn_context):
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continue
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result.append(statement)
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return result
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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,
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authn_decl=None, issuer=None, policy=None,
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sign_assertion=False, sign_response=False):
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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 2-tuple denoting the authn class and the authn
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authority.
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:param authn_decl:
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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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: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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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 2-tuple class+authority
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(authn_class, authn_authn) = authn
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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_class=authn_class,
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authn_auth=authn_authn)
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self.store_authn_statement(assertion.authn_statement, name_id)
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elif authn_decl:
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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_decl=authn_decl)
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self.store_authn_statement(assertion.authn_statement, name_id)
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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:
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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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self.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, **args)
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# ------------------------------------------------------------------------
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def create_error_response(self, in_response_to, destination, info,
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sign=False, issuer=None):
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""" Create a error response.
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:param in_response_to: The identifier of the message this is a response
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to.
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:param destination: The intended recipient of this message
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:param info: Either an Exception instance or a 2-tuple consisting of
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error code and descriptive text
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:param sign: Whether the response should be signed or not
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:param issuer: The issuer of the response
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:return: A response instance
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"""
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status = error_status_factory(info)
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return self._response(in_response_to, destination, status, issuer,
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sign)
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# ------------------------------------------------------------------------
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#noinspection PyUnusedLocal
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def create_aa_response(self, in_response_to, consumer_url, sp_entity_id,
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identity=None, userid="", name_id=None, status=None,
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issuer=None, sign_assertion=False,
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sign_response=False, attributes=None):
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""" Create an attribute assertion response.
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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 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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:return: A response instance
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"""
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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(self.config.policy, userid,
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sp_entity_id, identity)
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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 = []
|
|
args = {}
|
|
if identity:
|
|
_issuer = self._issuer(issuer)
|
|
ast = Assertion(identity)
|
|
policy = self.config.getattr("policy", "aa")
|
|
if policy:
|
|
ast.apply_policy(sp_entity_id, policy)
|
|
else:
|
|
policy = Policy()
|
|
|
|
if attributes:
|
|
restr = restriction_from_attribute_spec(attributes)
|
|
ast = filter_attribute_value_assertions(ast)
|
|
|
|
assertion = ast.construct(sp_entity_id, in_response_to,
|
|
consumer_url, name_id,
|
|
self.config.attribute_converters,
|
|
policy, issuer=_issuer)
|
|
|
|
if sign_assertion:
|
|
assertion.signature = pre_signature_part(assertion.id,
|
|
self.sec.my_cert, 1)
|
|
# Just the assertion or the response and the assertion ?
|
|
to_sign = [(class_name(assertion), assertion.id)]
|
|
|
|
|
|
args["assertion"] = assertion
|
|
|
|
return self._response(in_response_to, consumer_url, status, issuer,
|
|
sign_response, to_sign, **args)
|
|
|
|
# ------------------------------------------------------------------------
|
|
|
|
def create_authn_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):
|
|
""" Constructs an AuthenticationResponse
|
|
|
|
:param identity: Information about an user
|
|
:param in_response_to: The identifier of the authentication request
|
|
this response is an answer to.
|
|
:param destination: Where the response should be sent
|
|
:param sp_entity_id: The entity identifier of the Service Provider
|
|
:param name_id_policy: How the NameID should be constructed
|
|
:param userid: The subject identifier
|
|
:param authn: Information about the authentication
|
|
:param authn_decl:
|
|
:param issuer: Issuer of the response
|
|
:param sign_assertion: Whether the assertion should be signed or not.
|
|
:param sign_response: Whether the response should be signed or not.
|
|
:return: A response instance
|
|
"""
|
|
|
|
policy = self.config.getattr("policy", "idp")
|
|
|
|
if not name_id:
|
|
try:
|
|
nid_formats = []
|
|
for _sp in self.metadata[sp_entity_id]["spsso_descriptor"]:
|
|
if "name_id_format" in _sp:
|
|
nid_formats.extend([n["text"] for n in _sp["name_id_format"]])
|
|
|
|
name_id = self.ident.construct_nameid(policy, userid,
|
|
sp_entity_id, identity,
|
|
name_id_policy,
|
|
nid_formats)
|
|
except IOError, exc:
|
|
response = self.create_error_response(in_response_to,
|
|
destination,
|
|
sp_entity_id,
|
|
exc, name_id)
|
|
return ("%s" % response).split("\n")
|
|
|
|
try:
|
|
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, # Information about the
|
|
# authentication
|
|
authn_decl=authn_decl,
|
|
issuer=issuer,
|
|
policy=policy,
|
|
sign_assertion=sign_assertion,
|
|
sign_response=sign_response)
|
|
|
|
except MissingValue, exc:
|
|
return self.create_error_response(in_response_to, destination,
|
|
sp_entity_id, exc, name_id)
|
|
|
|
def create_assertion_id_request_response(self, assertion_id, in_response_to,
|
|
issuer=None, sign_response=False,
|
|
status=None):
|
|
"""
|
|
|
|
:param assertion_id:
|
|
:param in_response_to:
|
|
:param issuer:
|
|
:param sign_response:
|
|
:param status:
|
|
:return:
|
|
"""
|
|
# Done over SOAP
|
|
args = {}
|
|
to_sign = []
|
|
|
|
for aid in assertion_id:
|
|
try:
|
|
(assertion, to_sign) = self.get_assertion(aid)
|
|
to_sign.extend(to_sign)
|
|
try:
|
|
args["assertion"].append(assertion)
|
|
except KeyError:
|
|
args["assertion"] = [assertion]
|
|
except KeyError:
|
|
pass
|
|
|
|
return self._response(in_response_to, "", status, issuer,
|
|
sign_response, to_sign, **args)
|
|
|
|
def create_name_id_mapping_response(self, name_id=None, encrypted_id=None,
|
|
in_response_to=None,
|
|
issuer=None, sign_response=False,
|
|
status=None):
|
|
"""
|
|
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):
|
|
"""
|
|
A successful <Response> will contain one or more assertions containing
|
|
authentication statements.
|
|
|
|
:return:
|
|
"""
|
|
|
|
margs = self.message_args()
|
|
asserts = []
|
|
for statement in self.get_authn_statements(subject, 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)
|