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# Copyright 2020 Red Hat, Inc. Jake Hunsaker <jhunsake@redhat.com> # This file is part of the sos project: https://github.com/sosreport/sos # # This copyrighted material is made available to anyone wishing to use, # modify, copy, or redistribute it subject to the terms and conditions of # version 2 of the GNU General Public License. # # See the LICENSE file in the source distribution for further information. import re from sos.cleaner.parsers import SoSCleanerParser from sos.cleaner.mappings.mac_map import SoSMacMap # aa:bb:cc:fe:ff:dd:ee:ff IPV6_REG_8HEX = ( r'((?<!([0-9a-fA-F\'\"]:)|::)(?:[^:|-])?(?:[0-9a-fA-F]{2}(?:(:|-)){7})' r'[0-9a-fA-F]{2}(?:\'|\")?(?:\/|\,|\-|\.|\s|$))' ) # aabb:ccee:ddee:ffaa # - but disallow "substrings" # - but allow fe80: or fe80:: prefix for link-local IPV6_REG_4HEX = ( r'((?<!(?:([.|^|\b]{5}\w|[.|^|\b]fe80:|fe80::)))' r'(?:([0-9a-fA-F]{4}:){3}[0-9a-fA-F]{4})(?!\w))|' r'(?:(?<!\w)(([0-9a-fA-F]{4}-){3}[0-9a-fA-F]{4})(?!\w))' ) # aa:bb:cc:dd:ee:ff avoiding ipv6 substring matches IPV4_REG = ( r'((?<!([0-9a-fA-F\'\"]:)|::)' r'(?:([^:\-])?(?:([0-9a-fA-F]{2}([:\-\_])){5,6}(?:[0-9a-fA-F]{2}))))' ) class SoSMacParser(SoSCleanerParser): """Handles parsing for MAC addresses""" name = 'MAC Parser' # Cheap pre-filter: any two hex pairs separated by : - or _ # All MAC formats (6-byte, 8-byte, 4-hex-quad) contain this substring. # False positives are fine — the full regex rejects them. _quick_check = re.compile(r'[0-9a-fA-F]{2}[:\-_][0-9a-fA-F]{2}') regex_pattern = re.compile( rf'(({IPV6_REG_8HEX})|({IPV6_REG_4HEX})|({IPV4_REG}))' ) obfuscated_patterns = ( '53:4f:53', '534f:53' ) parser_skip_files = [ 'sos_commands/.*/modinfo.*' ] map_file_key = 'mac_map' compile_regexes = False def __init__(self, config, workdir, skip_cleaning_files=[]): self.mapping = SoSMacMap(workdir, self.regex_pattern) super().__init__(config, skip_cleaning_files) def reduce_mac_match(self, match): """Strips away leading and trailing non-alphanum characters from any matched string to leave us with just the bare MAC addr """ while not match[0] in '0123456789abcdefABCDEF': match = match[1:] while not match[-1] in '0123456789abcdefABCDEF': match = match[0:-1] # just to be safe, call strip() to remove any padding return match.strip() def _parse_line(self, line): count = 0 if not self._quick_check.search(line): return line, count matches = [m[0] for m in self.regex_pattern.findall(line)] if matches: count += len(matches) for match in matches: stripped_match = self.reduce_mac_match(match) if stripped_match.startswith(self.obfuscated_patterns): # avoid double scrubbing continue new_match = self.mapping.get(stripped_match) line = line.replace(stripped_match, new_match) return line, count
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