/usr/lib/python3/dist-packages/adal/mex.py is in python3-adal 0.4.6-1.
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#
# Copyright (c) Microsoft Corporation.
# All rights reserved.
#
# This code is licensed under the MIT License.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files(the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions :
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
#------------------------------------------------------------------------------
try:
from urllib.parse import urlparse
except ImportError:
from urlparse import urlparse # pylint: disable=import-error
try:
from xml.etree import cElementTree as ET
except ImportError:
from xml.etree import ElementTree as ET
import requests
from . import log
from . import util
from . import xmlutil
from .constants import XmlNamespaces, WSTrustVersion
from .adal_error import AdalError
TRANSPORT_BINDING_XPATH = 'wsp:ExactlyOne/wsp:All/sp:TransportBinding'
TRANSPORT_BINDING_2005_XPATH = 'wsp:ExactlyOne/wsp:All/sp2005:TransportBinding' #pylint: disable=invalid-name
SOAP_ACTION_XPATH = 'wsdl:operation/soap12:operation'
RST_SOAP_ACTION_13 = 'http://docs.oasis-open.org/ws-sx/ws-trust/200512/RST/Issue'
RST_SOAP_ACTION_2005 = 'http://schemas.xmlsoap.org/ws/2005/02/trust/RST/Issue' #pylint: disable=invalid-name
SOAP_TRANSPORT_XPATH = 'soap12:binding'
SOAP_HTTP_TRANSPORT_VALUE = 'http://schemas.xmlsoap.org/soap/http'
PORT_XPATH = 'wsdl:service/wsdl:port'
ADDRESS_XPATH = 'wsa10:EndpointReference/wsa10:Address'
def _url_is_secure(endpoint_url):
parsed = urlparse(endpoint_url)
return parsed.scheme == 'https'
class Mex(object):
def __init__(self, call_context, url):
self._log = log.Logger("MEX", call_context.get('log_context'))
self._call_context = call_context
self._url = url
self._dom = None
self._parents = None
self._mex_doc = None
self.username_password_policy = {}
self._log.debug("Mex created with url: %s", self._url)
def discover(self):
self._log.debug("Retrieving mex at: %s", self._url)
options = util.create_request_options(self, {'headers': {'Content-Type': 'application/soap+xml'}})
try:
operation = "Mex Get"
resp = requests.get(self._url, headers=options['headers'],
verify=self._call_context.get('verify_ssl', None))
util.log_return_correlation_id(self._log, operation, resp)
except Exception:
self._log.info("%s request failed", operation)
raise
if not util.is_http_success(resp.status_code):
return_error_string = u"{} request returned http error: {}".format(operation, resp.status_code)
error_response = ""
if resp.text:
return_error_string = u"{} and server response: {}".format(return_error_string, resp.text)
try:
error_response = resp.json()
except ValueError:
pass
raise AdalError(return_error_string, error_response)
else:
try:
self._mex_doc = resp.text
#options = {'errorHandler':self._log.error}
self._dom = ET.fromstring(self._mex_doc)
self._parents = {c:p for p in self._dom.iter() for c in p}
self._parse()
except Exception:
self._log.info('Failed to parse mex response in to DOM')
raise
def _check_policy(self, policy_node):
policy_id = policy_node.attrib["{{{}}}Id".format(XmlNamespaces.namespaces['wsu'])]
# Try with Transport Binding XPath
transport_binding_nodes = xmlutil.xpath_find(policy_node, TRANSPORT_BINDING_XPATH)
# If unsuccessful, try again with 2005 XPath
if not transport_binding_nodes:
transport_binding_nodes = xmlutil.xpath_find(policy_node, TRANSPORT_BINDING_2005_XPATH)
# If we did not find any binding, this is potentially bad.
if not transport_binding_nodes:
self._log.debug(
"Potential policy did not match required transport binding: %s",
policy_id)
else:
self._log.debug("Found matching policy id: %s", policy_id)
return policy_id
def _select_username_password_polices(self, xpath):
policies = {}
username_token_nodes = xmlutil.xpath_find(self._dom, xpath)
if not username_token_nodes:
self._log.warn("No username token policy nodes found.")
return
for node in username_token_nodes:
policy_node = self._parents[self._parents[self._parents[self._parents[self._parents[self._parents[self._parents[node]]]]]]]
policy_id = self._check_policy(policy_node)
if policy_id:
id_ref = '#' + policy_id
policies[id_ref] = {id:id_ref}
return policies if policies else None
def _check_soap_action_and_transport(self, binding_node):
soap_action = ""
soap_transport = ""
name = binding_node.get('name')
soap_transport_attributes = ""
soap_action_attributes = xmlutil.xpath_find(binding_node, SOAP_ACTION_XPATH)[0].attrib['soapAction']
if soap_action_attributes:
soap_action = soap_action_attributes
soap_transport_attributes = xmlutil.xpath_find(binding_node, SOAP_TRANSPORT_XPATH)[0].attrib['transport']
if soap_transport_attributes:
soap_transport = soap_transport_attributes
if soap_transport == SOAP_HTTP_TRANSPORT_VALUE:
if soap_action == RST_SOAP_ACTION_13:
self._log.debug('found binding matching Action and Transport: %s', name)
return WSTrustVersion.WSTRUST13
elif soap_action == RST_SOAP_ACTION_2005:
self._log.debug('found binding matching Action and Transport: %s', name)
return WSTrustVersion.WSTRUST2005
self._log.debug('binding node did not match soap Action or Transport: %s', name)
return WSTrustVersion.UNDEFINED
def _get_matching_bindings(self, policies):
bindings = {}
binding_policy_ref_nodes = xmlutil.xpath_find(self._dom, 'wsdl:binding/wsp:PolicyReference')
for node in binding_policy_ref_nodes:
uri = node.get('URI')
policy = policies.get(uri)
if policy:
binding_node = self._parents[node]
binding_name = binding_node.get('name')
version = self._check_soap_action_and_transport(binding_node)
if version != WSTrustVersion.UNDEFINED:
bindings[binding_name] = {
'url': uri,
'version': version
}
return bindings if bindings else None
def _get_ports_for_policy_bindings(self, bindings, policies):
port_nodes = xmlutil.xpath_find(self._dom, PORT_XPATH)
if not port_nodes:
self._log.warn("No ports found")
for node in port_nodes:
binding_id = node.get('binding')
binding_id = binding_id.split(':')[-1]
trust_policy = bindings.get(binding_id)
if trust_policy:
binding_policy = policies.get(trust_policy.get('url'))
if binding_policy and not binding_policy.get('url', None):
binding_policy['version'] = trust_policy['version']
address_node = node.find(ADDRESS_XPATH, XmlNamespaces.namespaces)
if address_node is None:
raise AdalError("No address nodes on port")
address = xmlutil.find_element_text(address_node)
if _url_is_secure(address):
binding_policy['url'] = address
else:
self._log.warn("Skipping insecure endpoint: %s",
address)
def _select_single_matching_policy(self, policies):
matching_policies = [p for p in policies.values() if p.get('url')]
if not matching_policies:
self._log.warn("No policies found with a url.")
return
wstrust13_policy = None
wstrust2005_policy = None
for policy in matching_policies:
version = policy.get('version', None)
if version == WSTrustVersion.WSTRUST13:
wstrust13_policy = policy
elif version == WSTrustVersion.WSTRUST2005:
wstrust2005_policy = policy
if wstrust13_policy is None and wstrust2005_policy is None:
self._log.warn('No policies found for either wstrust13 or wstrust2005')
self.username_password_policy = wstrust13_policy or wstrust2005_policy
def _parse(self):
policies = self._select_username_password_polices(
'wsp:Policy/wsp:ExactlyOne/wsp:All/sp:SignedEncryptedSupportingTokens/wsp:Policy/sp:UsernameToken/wsp:Policy/sp:WssUsernameToken10')
xpath2005 = 'wsp:Policy/wsp:ExactlyOne/wsp:All/sp2005:SignedSupportingTokens/wsp:Policy/sp2005:UsernameToken/wsp:Policy/sp2005:WssUsernameToken10'
if policies:
policies2005 = self._select_username_password_polices(xpath2005)
if policies2005:
policies.update(policies2005)
else:
policies = self._select_username_password_polices(xpath2005)
if not policies:
raise AdalError("No matching policies.")
bindings = self._get_matching_bindings(policies)
if not bindings:
raise AdalError("No matching bindings.")
self._get_ports_for_policy_bindings(bindings, policies)
self._select_single_matching_policy(policies)
if not self._url:
raise AdalError("No ws-trust endpoints match requirements.")
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