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ms_forest_updates_markdown.py
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# Create forest updates ldif from Github markdown # # Each update is converted to an ldif then gets written to a corresponding # .LDF output file or stored in a dictionary. # # Only add updates can generally be applied. # # Copyright (C) Andrew Bartlett <abartlet@samba.org> 2017 # # 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/>. """Generate LDIF from Github documentation.""" import re import os import markdown import xml.etree.ElementTree as ET from samba.common import get_string # Display specifier updates or otherwise (ignored in forest_update.py) def noop(description, attributes, sd): return (None, None, [], None) # ACE addition updates (ignored in forest_update.py) def parse_grant(description, attributes, sd): return ('modify', None, [], sd if sd.lower() != 'n/a' else None) # Addition of new objects to the directory (most are applied in forest_update.py) def parse_add(description, attributes, sd): dn = extract_dn(description) return ('add', dn, extract_attrib(dn, attributes), sd if sd.lower() != 'n/a' else None) # Set of a particular attribute (ignored in forest_update.py) def parse_set(description, attributes, sd): return ('modify', extract_dn_or_none(description), extract_replace_attrib(attributes), sd if sd.lower() != 'n/a' else None) # Set of a particular ACE (ignored in forest_update.py) # The general issue is that the list of DNs must be generated dynamically def parse_ace(description, attributes, sd): def extract_dn_ace(text): if 'Sam-Domain' in text: return ('${DOMAIN_DN}', 'CN=Sam-Domain,${SCHEMA_DN}') elif 'Domain-DNS' in text: return ('${...}', 'CN=Domain-DNS,${SCHEMA_DN}') return None return [('modify', extract_dn_ace(description)[0], ['replace: nTSecurityDescriptor', 'nTSecurityDescriptor: ${DOMAIN_SCHEMA_SD}%s' % sd], None), ('modify', extract_dn_ace(description)[1], ['replace: defaultSecurityDescriptor', 'defaultSecurityDescriptor: ${OLD_SAMBA_SD}%s' % sd], None)] # We are really only interested in 'Created' items operation_map = { # modify 'Granting': parse_grant, # add 'Created': parse_add, # modify 'Set': parse_set, # modify 'Added ACE': parse_ace, # modify 'Updated': parse_set, # unknown 'Call': noop } def extract_dn(text): """ Extract a DN from the textual description :param text: :return: DN in string form """ text = text.replace(' in the Schema partition.', ',${SCHEMA_DN}') text = text.replace(' in the Configuration partition.', ',${CONFIG_DN}') dn = re.search('([CDO][NCU]=.*?,)*([CDO][NCU]=.*)', text).group(0) # This should probably be also fixed upstream if dn == 'CN=ad://ext/AuthenticationSilo,CN=Claim Types,CN=Claims Configuration,CN=Services': return 'CN=ad://ext/AuthenticationSilo,CN=Claim Types,CN=Claims Configuration,CN=Services,${CONFIG_DN}' return dn def extract_dn_or_none(text): """ Same as above, but returns None if it doesn't work :param text: :return: DN or None """ try: return extract_dn(text) except: return None def save_ldif(filename, answers, out_folder): """ Save ldif to disk for each updates :param filename: filename use ([OPERATION NUM]-{GUID}.ldif) :param answers: array of tuples generated with earlier functions :param out_folder: folder to prepend """ path = os.path.join(out_folder, filename) with open(path, 'w') as ldif: for answer in answers: change, dn, attrib, sd = answer ldif.write('dn: %s\n' % dn) ldif.write('changetype: %s\n' % change) if len(attrib) > 0: ldif.write('\n'.join(attrib) + '\n') if sd is not None: ldif.write('nTSecurityDescriptor: D:%s\n' % sd) ldif.write('-\n\n') def save_array(guid, answers, out_dict): """ Save ldif to an output dictionary :param guid: GUID to store :param answers: array of tuples generated with earlier functions :param out_dict: output dictionary """ ldif = '' for answer in answers: change, dn, attrib, sd = answer ldif += 'dn: %s\n' % dn ldif += 'changetype: %s\n' % change if len(attrib) > 0: ldif += '\n'.join(attrib) + '\n' if sd is not None: ldif += 'nTSecurityDescriptor: D:%s\n' % sd ldif += '-\n\n' out_dict[guid] = ldif def extract_attrib(dn, attributes): """ Extract the attributes as an array from the attributes column :param dn: parsed from markdown :param attributes: from markdown :return: attribute array (ldif-type format) """ attrib = [x.lstrip('- ') for x in attributes.split('- ') if x.lower() != 'n/a' and x != ''] attrib = [x.replace(': True', ': TRUE') if x.endswith(': True') else x for x in attrib] attrib = [x.replace(': False', ': FALSE') if x.endswith(': False') else x for x in attrib] # We only have one such value, we may as well skip them all consistently attrib = [x for x in attrib if not x.lower().startswith('msds-claimpossiblevalues')] return attrib def extract_replace_attrib(attributes): """ Extract the attributes as an array from the attributes column (for replace) :param attributes: from markdown :return: attribute array (ldif-type format) """ lines = [x.lstrip('- ') for x in attributes.split('- ') if x.lower() != 'n/a' and x != ''] lines = [('replace: %s' % line.split(':')[0], line) for line in lines] lines = [line for pair in lines for line in pair] return lines def innertext(tag): return (tag.text or '') + \ ''.join(innertext(e) for e in tag) + \ (tag.tail or '') def read_ms_markdown(in_file, out_folder=None, out_dict=None): """ Read Github documentation to produce forest wide udpates :param in_file: Forest-Wide-Updates.md :param out_folder: output folder :param out_dict: output dictionary """ with open(in_file) as update_file: # There is a hidden ClaimPossibleValues in this md file html = markdown.markdown(re.sub(r'CN=<forest root domain.*?>', '${FOREST_ROOT_DOMAIN}', update_file.read()), output_format='xhtml') html = html.replace('CN=Schema,%ws', '${SCHEMA_DN}') tree = ET.fromstring('<root>' + html + '</root>') for node in tree: if node.text and node.text.startswith('|Operation'): # Strip first and last | updates = [x[1:len(x) - 1].split('|') for x in get_string(ET.tostring(node, method='text')).splitlines()] for update in updates[2:]: output = re.match('Operation (\d+): {(.*)}', update[0]) if output: # print output.group(1), output.group(2) guid = output.group(2) filename = "%s-{%s}.ldif" % (output.group(1).zfill(4), guid) found = False if update[3].startswith('Created') or update[1].startswith('Added ACE'): # Trigger the security descriptor code # Reduce info to just the security descriptor update[3] = update[3].split(':')[-1] result = parse_ace(update[1], update[2], update[3]) if filename and out_folder is not None: save_ldif(filename, result, out_folder) else: save_array(guid, result, out_dict) continue for operation in operation_map: if update[1].startswith(operation): found = True result = operation_map[operation](update[1], update[2], update[3]) if filename and out_folder is not None: save_ldif(filename, [result], out_folder) else: save_array(guid, [result], out_dict) break if not found: raise Exception(update) # print ET.tostring(node, method='text') if __name__ == '__main__': import sys out_folder = '' if len(sys.argv) == 0: print("Usage: %s <Forest-Wide-Updates.md> [<output folder>]" % (sys.argv[0]), file=sys.stderr) sys.exit(1) in_file = sys.argv[1] if len(sys.argv) > 2: out_folder = sys.argv[2] read_ms_markdown(in_file, out_folder)