/usr/lib/python3/dist-packages/apparmor/rule/signal.py is in python3-apparmor 2.10.95-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright (C) 2015 Christian Boltz <apparmor@cboltz.de>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of version 2 of the GNU General Public
# License as published by the Free Software Foundation.
#
# 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.
#
# ----------------------------------------------------------------------
import re
from apparmor.regex import RE_PROFILE_SIGNAL, RE_PROFILE_NAME
from apparmor.common import AppArmorBug, AppArmorException
from apparmor.rule import BaseRule, BaseRuleset, check_and_split_list, logprof_value_or_all, parse_modifiers, quote_if_needed
# setup module translations
from apparmor.translations import init_translation
_ = init_translation()
access_keywords_read = ['receive', 'r', 'read']
access_keywords_write = ['send', 'w', 'write']
access_keywords_rw = ['rw', 'wr']
access_keywords = access_keywords_read + access_keywords_write + access_keywords_rw
signal_keywords = ['hup', 'int', 'quit', 'ill', 'trap', 'abrt', 'bus', 'fpe', 'kill', 'usr1',
'segv', 'usr2', 'pipe', 'alrm', 'term', 'stkflt', 'chld', 'cont', 'stop',
'stp', 'ttin', 'ttou', 'urg', 'xcpu', 'xfsz', 'vtalrm', 'prof', 'winch',
'io', 'pwr', 'sys', 'emt', 'exists']
RE_SIGNAL_REALTIME = re.compile('^rtmin\+0*([0-9]|[12][0-9]|3[0-2])$') # rtmin+0..rtmin+32, number may have leading zeros
joint_access_keyword = '\s*(' + '|'.join(access_keywords) + ')\s*'
RE_ACCESS_KEYWORDS = ( joint_access_keyword + # one of the access_keyword or
'|' + # or
'\(' + joint_access_keyword + '(' + '(\s|,)+' + joint_access_keyword + ')*' + '\)' # one or more access_keyword in (...)
)
signal_keyword = '\s*([a-z0-9+]+|"[a-z0-9+]+")\s*' # don't check against the signal keyword list in the regex to allow a more helpful error message
RE_SIGNAL_KEYWORDS = (
'set\s*=\s*' + signal_keyword + # one of the signal_keyword or
'|' + # or
'set\s*=\s*\(' + signal_keyword + '(' + '(\s|,)+' + signal_keyword + ')*' + '\)' # one or more signal_keyword in (...)
)
RE_SIGNAL_DETAILS = re.compile(
'^' +
'(\s+(?P<access>' + RE_ACCESS_KEYWORDS + '))?' + # optional access keyword(s)
'(?P<signal>' + '(\s+(' + RE_SIGNAL_KEYWORDS + '))+' + ')?' + # optional signal set(s)
'(\s+(peer=' + RE_PROFILE_NAME % 'peer' + '))?' + # optional peer
'\s*$')
RE_FILTER_SET_1 = re.compile('set\s*=\s*\(([^)]*)\)')
RE_FILTER_SET_2 = re.compile('set\s*=')
RE_FILTER_PARENTHESIS = re.compile('\((.*)\)')
RE_FILTER_QUOTES = re.compile('"([a-z0-9]+)"') # used to strip quotes around signal keywords - don't use for peer!
class SignalRule(BaseRule):
'''Class to handle and store a single signal rule'''
# Nothing external should reference this class, all external users
# should reference the class field SignalRule.ALL
class __SignalAll(object):
pass
ALL = __SignalAll
rule_name = 'signal'
def __init__(self, access, signal, peer, audit=False, deny=False, allow_keyword=False,
comment='', log_event=None):
super(SignalRule, self).__init__(audit=audit, deny=deny,
allow_keyword=allow_keyword,
comment=comment,
log_event=log_event)
self.access, self.all_access, unknown_items = check_and_split_list(access, access_keywords, SignalRule.ALL, 'SignalRule', 'access')
if unknown_items:
raise AppArmorException(_('Passed unknown access keyword to SignalRule: %s') % ' '.join(unknown_items))
self.signal, self.all_signals, unknown_items = check_and_split_list(signal, signal_keywords, SignalRule.ALL, 'SignalRule', 'signal')
if unknown_items:
for item in unknown_items:
if RE_SIGNAL_REALTIME.match(item):
self.signal.add(item)
else:
raise AppArmorException(_('Passed unknown signal keyword to SignalRule: %s') % item)
self.peer, self.all_peers = self._aare_or_all(peer, 'peer', is_path=False, log_event=log_event)
@classmethod
def _match(cls, raw_rule):
return RE_PROFILE_SIGNAL.search(raw_rule)
@classmethod
def _parse(cls, raw_rule):
'''parse raw_rule and return SignalRule'''
matches = cls._match(raw_rule)
if not matches:
raise AppArmorException(_("Invalid signal rule '%s'") % raw_rule)
audit, deny, allow_keyword, comment = parse_modifiers(matches)
rule_details = ''
if matches.group('details'):
rule_details = matches.group('details')
if rule_details:
details = RE_SIGNAL_DETAILS.search(rule_details)
if not details:
raise AppArmorException(_("Invalid or unknown keywords in 'signal %s" % rule_details))
if details.group('access'):
access = details.group('access')
if access.startswith('(') and access.endswith(')'):
access = access[1:-1]
access = access.replace(',', ' ').split() # split by ',' or whitespace
else:
access = SignalRule.ALL
if details.group('signal'):
signal = details.group('signal')
signal = RE_FILTER_SET_1.sub(r'\1', signal) # filter out 'set='
signal = RE_FILTER_SET_2.sub('', signal) # filter out 'set='
signal = RE_FILTER_QUOTES.sub(r' \1 ', signal) # filter out quote pairs
signal = signal.replace(',', ' ').split() # split at ',' or whitespace
else:
signal = SignalRule.ALL
if details.group('peer'):
peer = details.group('peer')
else:
peer = SignalRule.ALL
else:
access = SignalRule.ALL
signal = SignalRule.ALL
peer = SignalRule.ALL
return SignalRule(access, signal, peer,
audit=audit, deny=deny, allow_keyword=allow_keyword, comment=comment)
def get_clean(self, depth=0):
'''return rule (in clean/default formatting)'''
space = ' ' * depth
if self.all_access:
access = ''
elif len(self.access) == 1:
access = ' %s' % ' '.join(self.access)
elif self.access:
access = ' (%s)' % ' '.join(sorted(self.access))
else:
raise AppArmorBug('Empty access in signal rule')
if self.all_signals:
signal = ''
elif len(self.signal) == 1:
signal = ' set=%s' % ' '.join(self.signal)
elif self.signal:
signal = ' set=(%s)' % ' '.join(sorted(self.signal))
else:
raise AppArmorBug('Empty signal in signal rule')
if self.all_peers:
peer = ''
elif self.peer:
peer = ' peer=%s' % quote_if_needed(self.peer.regex)
else:
raise AppArmorBug('Empty peer in signal rule')
return('%s%ssignal%s%s%s,%s' % (space, self.modifiers_str(), access, signal, peer, self.comment))
def is_covered_localvars(self, other_rule):
'''check if other_rule is covered by this rule object'''
if not self._is_covered_list(self.access, self.all_access, other_rule.access, other_rule.all_access, 'access'):
return False
if not self._is_covered_list(self.signal, self.all_signals, other_rule.signal, other_rule.all_signals, 'signal'):
return False
if not self._is_covered_aare(self.peer, self.all_peers, other_rule.peer, other_rule.all_peers, 'peer'):
return False
# still here? -> then it is covered
return True
def is_equal_localvars(self, rule_obj):
'''compare if rule-specific variables are equal'''
if not type(rule_obj) == SignalRule:
raise AppArmorBug('Passed non-signal rule: %s' % str(rule_obj))
if (self.access != rule_obj.access
or self.all_access != rule_obj.all_access):
return False
if (self.signal != rule_obj.signal
or self.all_signals != rule_obj.all_signals):
return False
if not self._is_equal_aare(self.peer, self.all_peers, rule_obj.peer, rule_obj.all_peers, 'peer'):
return False
return True
def logprof_header_localvars(self):
access = logprof_value_or_all(self.access, self.all_access)
signal = logprof_value_or_all(self.signal, self.all_signals)
peer = logprof_value_or_all(self.peer, self.all_peers)
return [
_('Access mode'), access,
_('Signal'), signal,
_('Peer'), peer
]
class SignalRuleset(BaseRuleset):
'''Class to handle and store a collection of signal rules'''
def get_glob(self, path_or_rule):
'''Return the next possible glob. For signal rules, that means removing access, signal or peer'''
# XXX only remove one part, not all
return 'signal,'
|