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Harden XML parsing with secure lxml parser configuration by ssaurabhkumarsinha38sks-art · Pull Request #171 · AuthorizeNet/sdk-python · GitHub

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Harden XML parsing with secure lxml parser configuration #171

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Harden XML parsing with secure lxml parser configuration #171

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14 changes: 11 additions & 3 deletions authorizenet/apicontrollersbase.py
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,7 @@
import sys
import xml.dom.minidom
import requests
from lxml import objectify
from lxml import etree, objectify

from authorizenet.constants import constants
from authorizenet import apicontractsv1
Expand Down Expand Up @@ -142,21 +142,29 @@ def execute(self):
self._httpResponse.encoding = constants.response_encoding
self._httpResponse = self._httpResponse.text[3:] #strip BOM
self.afterexecute()

# Create secure XML parser to prevent XXE attacks
secure_parser = etree.XMLParser(
resolve_entities=False,
no_network=True,
dtd_validation=False,
load_dtd=False
)
try:
self._response = apicontractsv1.CreateFromDocument(self._httpResponse)
#objectify code
xmlResponse= self._response.toxml(encoding=constants.xml_encoding, element_name=self.getrequesttype())
xmlResponse = xmlResponse.replace(constants.nsNamespace1, b'')
xmlResponse = xmlResponse.replace(constants.nsNamespace2, b'')
self._mainObject = objectify.fromstring(xmlResponse)
self._mainObject = objectify.fromstring(xmlResponse, parser=secure_parser)

except Exception as objectifyexception:
anetLogger.error( 'Create Document Exception: %s, %s', type(objectifyexception), objectifyexception.args )
responseString = self._httpResponse

# removing encoding attribute as objectify fails if it is present
responseString = responseString.replace('encoding=\"utf-8\"', '')
self._mainObject = objectify.fromstring(responseString)
self._mainObject = objectify.fromstring(responseString, parser=secure_parser)
else:
if type(self.getresponseclass()) != type(self._mainObject):
if self._response.messages.resultCode == "Error":
Expand Down
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