d2cfca68d0
urllib.request.Request.get_host() is removed in python >=3.4 in favor of urllib.request.Request.host. It works in python 2.7 too. Update the test to use Mock with spec where applicable, to ensure that only available attributes are accessed. Change-Id: I0e6a4e1539f9db329b6f113207d52f171cc600a7
122 lines
4.1 KiB
Python
122 lines
4.1 KiB
Python
# Copyright (C) 2015 OpenStack Foundation
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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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import logging
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import re
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import kerberos
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from six.moves.urllib import error, request
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logger = logging.getLogger(__name__)
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class HTTPNegotiateHandler(request.BaseHandler):
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handler_order = 490 # before Digest auth
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def __init__(self, max_tries=5):
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self.krb_context = None
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self.tries = 0
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self.max_tries = max_tries
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self.re_extract_auth = re.compile('.*?Negotiate\s*([^,]*)', re.I)
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def http_error_401(self, req, fp, code, msg, headers):
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logger.debug("INSIDE http_error_401")
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try:
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try:
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krb_req = self._extract_krb_value(headers)
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except ValueError:
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# Negotiate header not found or a similar error
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# we can't handle this, let the next handler have a go
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return None
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if not krb_req:
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# First reply from server (no neg value)
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self.tries = 0
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krb_req = ""
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else:
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if self.tries > self.max_tries:
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raise error.HTTPError(
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req.get_full_url(), 401, "Negotiate auth failed",
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headers, None)
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self.tries += 1
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try:
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krb_resp = self._krb_response(req.host, krb_req)
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req.add_unredirected_header('Authorization',
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"Negotiate %s" % krb_resp)
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resp = self.parent.open(req, timeout=req.timeout)
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self._authenticate_server(resp.headers)
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return resp
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except kerberos.GSSError as err:
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try:
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msg = err.args[1][0]
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except Exception:
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msg = "Negotiate auth failed"
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logger.debug(msg)
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return None # let the next handler (if any) have a go
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finally:
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if self.krb_context is not None:
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kerberos.authGSSClientClean(self.krb_context)
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self.krb_context = None
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def _krb_response(self, host, krb_val):
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logger.debug("INSIDE _krb_response")
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_dummy, self.krb_context = kerberos.authGSSClientInit("HTTP@%s" % host)
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kerberos.authGSSClientStep(self.krb_context, krb_val)
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response = kerberos.authGSSClientResponse(self.krb_context)
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logger.debug("kerb auth successful")
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return response
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def _authenticate_server(self, headers):
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logger.debug("INSIDE _authenticate_server")
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try:
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val = self._extract_krb_value(headers)
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except ValueError:
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logger.critical("Server authentication failed."
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"Auth value couldn't be extracted from headers.")
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return None
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if not val:
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logger.critical("Server authentication failed."
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"Empty 'Negotiate' value.")
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return None
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kerberos.authGSSClientStep(self.krb_context, val)
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def _extract_krb_value(self, headers):
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logger.debug("INSIDE _extract_krb_value")
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header = headers.get('www-authenticate', None)
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if header is None:
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msg = "www-authenticate header not found"
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logger.debug(msg)
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raise ValueError(msg)
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if "negotiate" in header.lower():
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matches = self.re_extract_auth.search(header)
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if matches:
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return matches.group(1)
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else:
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return ""
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else:
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msg = "Negotiate not in www-authenticate header (%s)" % header
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logger.debug(msg)
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raise ValueError(msg)
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