236 lines
8.3 KiB
Python
Executable File
236 lines
8.3 KiB
Python
Executable File
from oic.utils.http_util import Redirect
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from oic.exception import MissingAttribute
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from oic import oic
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from oic.oauth2 import rndstr, ErrorResponse
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from oic.oic import ProviderConfigurationResponse, AuthorizationResponse
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from oic.oic import RegistrationResponse
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from oic.oic import AuthorizationRequest
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from oic.utils.authn.client import CLIENT_AUTHN_METHOD
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__author__ = 'roland'
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import logging
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logger = logging.getLogger(__name__)
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class OIDCError(Exception):
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pass
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class Client(oic.Client):
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def __init__(self, client_id=None, ca_certs=None,
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client_prefs=None, client_authn_method=None, keyjar=None,
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verify_ssl=True, behaviour=None):
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oic.Client.__init__(self, client_id, ca_certs, client_prefs,
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client_authn_method, keyjar, verify_ssl)
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if behaviour:
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self.behaviour = behaviour
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def create_authn_request(self, session, acr_value=None):
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session["state"] = rndstr()
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session["nonce"] = rndstr()
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request_args = {
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"response_type": self.behaviour["response_type"],
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"scope": self.behaviour["scope"],
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"state": session["state"],
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# "nonce": session["nonce"],
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"redirect_uri": self.registration_response["redirect_uris"][0]
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}
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if acr_value is not None:
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request_args["acr_values"] = acr_value
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cis = self.construct_AuthorizationRequest(request_args=request_args)
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logger.debug("request: %s" % cis)
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url, body, ht_args, cis = self.uri_and_body(AuthorizationRequest, cis,
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method="GET",
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request_args=request_args)
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logger.debug("body: %s" % body)
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logger.info("URL: %s" % url)
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logger.debug("ht_args: %s" % ht_args)
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return str(url), ht_args
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def callback(self, response):
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"""
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This is the method that should be called when an AuthN response has been
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received from the OP.
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:param response: The URL returned by the OP
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:return:
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"""
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authresp = self.parse_response(AuthorizationResponse, response,
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sformat="dict", keyjar=self.keyjar)
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if isinstance(authresp, ErrorResponse):
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return OIDCError("Access denied")
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try:
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self.id_token[authresp["state"]] = authresp["id_token"]
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except KeyError:
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pass
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if self.behaviour["response_type"] == "code":
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# get the access token
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try:
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args = {
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"grant_type": "authorization_code",
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"code": authresp["code"],
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"redirect_uri": self.registration_response[
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"redirect_uris"][0],
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"client_id": self.client_id,
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"client_secret": self.client_secret
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}
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atresp = self.do_access_token_request(
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scope="openid", state=authresp["state"], request_args=args,
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authn_method=self.registration_response["token_endpoint_auth_method"])
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except Exception as err:
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logger.error("%s" % err)
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raise
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if isinstance(atresp, ErrorResponse):
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raise OIDCError("Invalid response %s." % atresp["error"])
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inforesp = self.do_user_info_request(state=authresp["state"],
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behavior='use_authorization_header')
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if isinstance(inforesp, ErrorResponse):
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raise OIDCError("Invalid response %s." % inforesp["error"])
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userinfo = inforesp.to_dict()
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logger.debug("UserInfo: %s" % inforesp)
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return userinfo
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class OIDCClients(object):
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def __init__(self, config):
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"""
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:param config: Imported configuration module
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:return:
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"""
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self.client = {}
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self.client_cls = Client
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self.config = config
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for key, val in config.CLIENTS.items():
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if key == "":
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continue
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else:
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self.client[key] = self.create_client(**val)
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def create_client(self, userid="", **kwargs):
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"""
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Do an instantiation of a client instance
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:param userid: An identifier of the user
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:param: Keyword arguments
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Keys are ["srv_discovery_url", "client_info", "client_registration",
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"provider_info"]
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:return: client instance
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"""
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_key_set = set(kwargs.keys())
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args = {}
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for param in ["verify_ssl"]:
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try:
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args[param] = kwargs[param]
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except KeyError:
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pass
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else:
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_key_set.discard(param)
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client = self.client_cls(client_authn_method=CLIENT_AUTHN_METHOD,
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behaviour=kwargs["behaviour"], verify_ssl=self.config.VERIFY_SSL, **args)
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# The behaviour parameter is not significant for the election process
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_key_set.discard("behaviour")
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for param in ["allow"]:
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try:
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setattr(client, param, kwargs[param])
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except KeyError:
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pass
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else:
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_key_set.discard(param)
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if _key_set == set(["client_info"]): # Everything dynamic
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# There has to be a userid
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if not userid:
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raise MissingAttribute("Missing userid specification")
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# Find the service that provides information about the OP
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issuer = client.wf.discovery_query(userid)
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# Gather OP information
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_ = client.provider_config(issuer)
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# register the client
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_ = client.register(client.provider_info["registration_endpoint"],
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**kwargs["client_info"])
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elif _key_set == set(["client_info", "srv_discovery_url"]):
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# Ship the webfinger part
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# Gather OP information
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_ = client.provider_config(kwargs["srv_discovery_url"])
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# register the client
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_ = client.register(client.provider_info["registration_endpoint"],
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**kwargs["client_info"])
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elif _key_set == set(["provider_info", "client_info"]):
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client.handle_provider_config(
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ProviderConfigurationResponse(**kwargs["provider_info"]),
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kwargs["provider_info"]["issuer"])
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_ = client.register(client.provider_info["registration_endpoint"],
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**kwargs["client_info"])
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elif _key_set == set(["provider_info", "client_registration"]):
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client.handle_provider_config(
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ProviderConfigurationResponse(**kwargs["provider_info"]),
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kwargs["provider_info"]["issuer"])
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client.store_registration_info(RegistrationResponse(
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**kwargs["client_registration"]))
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elif _key_set == set(["srv_discovery_url", "client_registration"]):
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_ = client.provider_config(kwargs["srv_discovery_url"])
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client.store_registration_info(RegistrationResponse(
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**kwargs["client_registration"]))
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else:
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raise Exception("Configuration error ?")
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return client
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def dynamic_client(self, userid):
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client = self.client_cls(client_authn_method=CLIENT_AUTHN_METHOD,
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verify_ssl=self.config.VERIFY_SSL)
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issuer = client.wf.discovery_query(userid)
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if issuer in self.client:
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return self.client[issuer]
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else:
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# Gather OP information
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_pcr = client.provider_config(issuer)
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# register the client
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_ = client.register(_pcr["registration_endpoint"],
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**self.config.CLIENTS[""]["client_info"])
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try:
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client.behaviour.update(**self.config.CLIENTS[""]["behaviour"])
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except KeyError:
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pass
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self.client[issuer] = client
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return client
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def __getitem__(self, item):
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"""
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Given a service or user identifier return a suitable client
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:param item:
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:return:
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"""
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try:
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return self.client[item]
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except KeyError:
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return self.dynamic_client(item)
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def keys(self):
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return self.client.keys()
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