/usr/lib/python3/dist-packages/apparmor/rule/capability.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) 2013 Kshitij Gupta <kgupta8592@gmail.com>
# Copyright (C) 2014 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.
#
# ----------------------------------------------------------------------
from apparmor.regex import RE_PROFILE_CAP
from apparmor.common import AppArmorBug, AppArmorException, type_is_str
from apparmor.rule import BaseRule, BaseRuleset, logprof_value_or_all, parse_modifiers
import re
# setup module translations
from apparmor.translations import init_translation
_ = init_translation()
class CapabilityRule(BaseRule):
'''Class to handle and store a single capability rule'''
# Nothing external should reference this class, all external users
# should reference the class field CapabilityRule.ALL
class __CapabilityAll(object):
pass
ALL = __CapabilityAll
rule_name = 'capability'
def __init__(self, cap_list, audit=False, deny=False, allow_keyword=False,
comment='', log_event=None):
super(CapabilityRule, self).__init__(audit=audit, deny=deny,
allow_keyword=allow_keyword,
comment=comment,
log_event=log_event)
# Because we support having multiple caps in one rule,
# initializer needs to accept a list of caps.
self.all_caps = False
if cap_list == CapabilityRule.ALL:
self.all_caps = True
self.capability = set()
else:
if type_is_str(cap_list):
self.capability = {cap_list}
elif type(cap_list) == list and len(cap_list) > 0:
self.capability = set(cap_list)
else:
raise AppArmorBug('Passed unknown object to CapabilityRule: %s' % str(cap_list))
# make sure none of the cap_list arguments are blank, in
# case we decide to return one cap per output line
for cap in self.capability:
if len(cap.strip()) == 0:
raise AppArmorBug('Passed empty capability to CapabilityRule: %s' % str(cap_list))
@classmethod
def _match(cls, raw_rule):
return RE_PROFILE_CAP.search(raw_rule)
@classmethod
def _parse(cls, raw_rule):
'''parse raw_rule and return CapabilityRule'''
matches = cls._match(raw_rule)
if not matches:
raise AppArmorException(_("Invalid capability rule '%s'") % raw_rule)
audit, deny, allow_keyword, comment = parse_modifiers(matches)
capability = []
if matches.group('capability'):
capability = matches.group('capability').strip()
capability = re.split("[ \t]+", capability)
else:
capability = CapabilityRule.ALL
return CapabilityRule(capability, 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_caps:
return('%s%scapability,%s' % (space, self.modifiers_str(), self.comment))
else:
caps = ' '.join(self.capability).strip() # XXX return multiple lines, one for each capability, instead?
if caps:
return('%s%scapability %s,%s' % (space, self.modifiers_str(), ' '.join(sorted(self.capability)), self.comment))
else:
raise AppArmorBug("Empty capability rule")
def is_covered_localvars(self, other_rule):
'''check if other_rule is covered by this rule object'''
if not self._is_covered_list(self.capability, self.all_caps, other_rule.capability, other_rule.all_caps, 'capability'):
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) == CapabilityRule:
raise AppArmorBug('Passed non-capability rule: %s' % str(rule_obj))
if (self.capability != rule_obj.capability
or self.all_caps != rule_obj.all_caps):
return False
return True
def severity(self, sev_db):
if self.all_caps:
severity = sev_db.rank_capability('__ALL__')
else:
severity = -1
for cap in self.capability:
sev = sev_db.rank_capability(cap)
if isinstance(sev, int): # type check avoids breakage caused by 'unknown'
severity = max(severity, sev)
if severity == -1:
severity = sev # effectively 'unknown'
return severity
def logprof_header_localvars(self):
cap_txt = logprof_value_or_all(self.capability, self.all_caps)
return [
_('Capability'), cap_txt,
]
class CapabilityRuleset(BaseRuleset):
'''Class to handle and store a collection of capability rules'''
def get_glob(self, path_or_rule):
'''Return the next possible glob. For capability rules, that's always "capability," (all capabilities)'''
return 'capability,'
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