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# GPO Parser for generic extensions
#
# Copyright (C) Andrew Bartlett <abartlet@samba.org> 2018
# Written by Garming Sam <garming@catalyst.net.nz>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
from xml.dom import minidom
from io import BytesIO
from xml.etree.ElementTree import ElementTree, fromstring, tostring
from hashlib import md5
from samba.common import get_bytes
ENTITY_USER_ID = 0
ENTITY_SDDL_ACL = 1
ENTITY_NETWORK_PATH = 2
class GPNoParserException(Exception):
pass
class GPGeneralizeException(Exception):
pass
def entity_type_to_string(ent_type):
type_str = None
if ent_type == ENTITY_USER_ID:
type_str = "USER_ID"
elif ent_type == ENTITY_SDDL_ACL:
type_str = "SDDL_ACL"
elif ent_type == ENTITY_NETWORK_PATH:
type_str = "NETWORK_PATH"
return type_str
# [MS-GPIPSEC] (LDAP)
# [MS-GPDPC] Deployed Printer Connections (LDAP)
# [MS-GPPREF] Preferences Extension (XML)
# [MS-GPWL] Wireless/Wired Protocol Extension (LDAP)
class GPParser(object):
encoding = 'utf-16'
output_encoding = 'utf-8'
def parse(self, contents):
pass
def write_xml(self, filename):
with open(filename, 'w') as f:
f.write('<?xml version="1.0" encoding="utf-8"?><UnknownFile/>')
def load_xml(self, filename):
pass
def write_binary(self, filename):
raise GPNoParserException("This file has no parser available.")
def write_pretty_xml(self, xml_element, handle):
# Add the xml header as well as format it nicely.
# ElementTree doesn't have a pretty-print, so use minidom.
et = ElementTree(xml_element)
temporary_bytes = BytesIO()
et.write(temporary_bytes, encoding=self.output_encoding,
xml_declaration=True)
minidom_parsed = minidom.parseString(temporary_bytes.getvalue())
handle.write(minidom_parsed.toprettyxml(encoding=self.output_encoding))
def new_xml_entity(self, name, ent_type):
identifier = md5(get_bytes(name)).hexdigest()
type_str = entity_type_to_string(ent_type)
if type_str is None:
raise GPGeneralizeException("No such entity type")
# For formatting reasons, align the length of the entities
longest = entity_type_to_string(ENTITY_NETWORK_PATH)
type_str = type_str.center(len(longest), '_')
return "&SAMBA__{}__{}__;".format(type_str, identifier)
def generalize_xml(self, root, out_file, global_entities):
entities = []
# Locate all user_id and all ACLs
user_ids = root.findall('.//*[@user_id="TRUE"]')
user_ids.sort(key = lambda x: x.tag)
for elem in user_ids:
old_text = elem.text
if old_text is None or old_text == '':
continue
if old_text in global_entities:
elem.text = global_entities[old_text]
entities.append((elem.text, old_text))
else:
elem.text = self.new_xml_entity(old_text,
ENTITY_USER_ID)
entities.append((elem.text, old_text))
global_entities.update([(old_text, elem.text)])
acls = root.findall('.//*[@acl="TRUE"]')
acls.sort(key = lambda x: x.tag)
for elem in acls:
old_text = elem.text
if old_text is None or old_text == '':
continue
if old_text in global_entities:
elem.text = global_entities[old_text]
entities.append((elem.text, old_text))
else:
elem.text = self.new_xml_entity(old_text,
ENTITY_SDDL_ACL)
entities.append((elem.text, old_text))
global_entities.update([(old_text, elem.text)])
share_paths = root.findall('.//*[@network_path="TRUE"]')
share_paths.sort(key = lambda x: x.tag)
for elem in share_paths:
old_text = elem.text
if old_text is None or old_text == '':
continue
stripped = old_text.lstrip('\\')
file_server = stripped.split('\\')[0]
server_index = old_text.find(file_server)
remaining = old_text[server_index + len(file_server):]
old_text = old_text[:server_index] + file_server
if old_text in global_entities:
elem.text = global_entities[old_text] + remaining
to_put = global_entities[old_text]
entities.append((to_put, old_text))
else:
to_put = self.new_xml_entity(old_text,
ENTITY_NETWORK_PATH)
elem.text = to_put + remaining
entities.append((to_put, old_text))
global_entities.update([(old_text, to_put)])
# Call any file specific customization of entities
# (which appear in any subclasses).
entities.extend(self.custom_entities(root, global_entities))
output_xml = tostring(root)
for ent in entities:
entb = get_bytes(ent[0])
output_xml = output_xml.replace(entb.replace(b'&', b'&'), entb)
with open(out_file, 'wb') as f:
f.write(output_xml)
return entities
def custom_entities(self, root, global_entities):
# Override this method to do special entity handling
return []
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