/usr/lib/python3/dist-packages/apparmor/logparser.py is in python3-apparmor 2.9.0-3.
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>
#
# 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 os
import re
import sys
import time
import LibAppArmor
from apparmor.common import AppArmorException, open_file_read, DebugLogger
from apparmor.aamode import validate_log_mode, log_str_to_mode, hide_log_mode, AA_MAY_EXEC
# setup module translations
from apparmor.translations import init_translation
_ = init_translation()
class ReadLog:
RE_LOG_v2_6_syslog = re.compile('kernel:\s+(\[[\d\.\s]+\]\s+)?type=\d+\s+audit\([\d\.\:]+\):\s+apparmor=')
RE_LOG_v2_6_audit = re.compile('type=AVC\s+(msg=)?audit\([\d\.\:]+\):\s+apparmor=')
# Used by netdomain to identify the operation types
# New socket names
OPERATION_TYPES = {'create': 'net',
'post_create': 'net',
'bind': 'net',
'connect': 'net',
'listen': 'net',
'accept': 'net',
'sendmsg': 'net',
'recvmsg': 'net',
'getsockname': 'net',
'getpeername': 'net',
'getsockopt': 'net',
'setsockopt': 'net',
'sock_shutdown': 'net'
}
def __init__(self, pid, filename, existing_profiles, profile_dir, log):
self.filename = filename
self.profile_dir = profile_dir
self.pid = pid
self.existing_profiles = existing_profiles
self.log = log
self.debug_logger = DebugLogger('ReadLog')
self.LOG = None
self.logmark = ''
self.seenmark = None
self.next_log_entry = None
def prefetch_next_log_entry(self):
if self.next_log_entry:
sys.stderr.out('A log entry already present: %s' % self.next_log_entry)
self.next_log_entry = self.LOG.readline()
while not self.RE_LOG_v2_6_syslog.search(self.next_log_entry) and not self.RE_LOG_v2_6_audit.search(self.next_log_entry) and not (self.logmark and self.logmark in self.next_log_entry):
self.next_log_entry = self.LOG.readline()
if not self.next_log_entry:
break
def get_next_log_entry(self):
# If no next log entry fetch it
if not self.next_log_entry:
self.prefetch_next_log_entry()
log_entry = self.next_log_entry
self.next_log_entry = None
return log_entry
def peek_at_next_log_entry(self):
# Take a peek at the next log entry
if not self.next_log_entry:
self.prefetch_next_log_entry()
return self.next_log_entry
def throw_away_next_log_entry(self):
self.next_log_entry = None
def parse_log_record(self, record):
self.debug_logger.debug('parse_log_record: %s' % record)
record_event = self.parse_event(record)
return record_event
def parse_event(self, msg):
"""Parse the event from log into key value pairs"""
msg = msg.strip()
self.debug_logger.info('parse_event: %s' % msg)
#print(repr(msg))
if sys.version_info < (3, 0):
# parse_record fails with u'foo' style strings hence typecasting to string
msg = str(msg)
event = LibAppArmor.parse_record(msg)
ev = dict()
ev['resource'] = event.info
ev['active_hat'] = event.active_hat
ev['aamode'] = event.event
ev['time'] = event.epoch
ev['operation'] = event.operation
ev['profile'] = event.profile
ev['name'] = event.name
ev['name2'] = event.name2
ev['attr'] = event.attribute
ev['parent'] = event.parent
ev['pid'] = event.pid
ev['task'] = event.task
ev['info'] = event.info
dmask = event.denied_mask
rmask = event.requested_mask
ev['magic_token'] = event.magic_token
if ev['operation'] and self.op_type(ev['operation']) == 'net':
ev['family'] = event.net_family
ev['protocol'] = event.net_protocol
ev['sock_type'] = event.net_sock_type
LibAppArmor.free_record(event)
# Map c (create) to a and d (delete) to w, logprof doesn't support c and d
if rmask:
rmask = rmask.replace('c', 'a')
rmask = rmask.replace('d', 'w')
if not validate_log_mode(hide_log_mode(rmask)):
raise AppArmorException(_('Log contains unknown mode %s') % rmask)
if dmask:
dmask = dmask.replace('c', 'a')
dmask = dmask.replace('d', 'w')
if not validate_log_mode(hide_log_mode(dmask)):
raise AppArmorException(_('Log contains unknown mode %s') % dmask)
#print('parse_event:', ev['profile'], dmask, ev['name2'])
mask, name = log_str_to_mode(ev['profile'], dmask, ev['name2'])
ev['denied_mask'] = mask
ev['name2'] = name
mask, name = log_str_to_mode(ev['profile'], rmask, ev['name2'])
ev['request_mask'] = mask
ev['name2'] = name
if not ev['time']:
ev['time'] = int(time.time())
# Remove None keys
#for key in ev.keys():
# if not ev[key] or not re.search('[\w]+', ev[key]):
# ev.pop(key)
if ev['aamode']:
# Convert aamode values to their counter-parts
mode_convertor = {0: 'UNKNOWN',
1: 'ERROR',
2: 'AUDIT',
3: 'PERMITTING',
4: 'REJECTING',
5: 'HINT',
6: 'STATUS'
}
try:
ev['aamode'] = mode_convertor[ev['aamode']]
except KeyError:
ev['aamode'] = None
if ev['aamode']:
#debug_logger.debug(ev)
return ev
else:
return None
def add_to_tree(self, loc_pid, parent, type, event):
self.debug_logger.info('add_to_tree: pid [%s] type [%s] event [%s]' % (loc_pid, type, event))
if not self.pid.get(loc_pid, False):
profile, hat = event[:2]
if parent and self.pid.get(parent, False):
if not hat:
hat = 'null-complain-profile'
arrayref = []
self.pid[parent].append(arrayref)
self.pid[loc_pid] = arrayref
for ia in ['fork', loc_pid, profile, hat]:
arrayref.append(ia)
# self.pid[parent].append(array_ref)
# self.pid[loc_pid] = array_ref
else:
arrayref = []
self.log.append(arrayref)
self.pid[loc_pid] = arrayref
# self.log.append(array_ref)
# self.pid[loc_pid] = array_ref
self.pid[loc_pid].append([type, loc_pid] + event)
#print("\n\npid",self.pid)
#print("log",self.log)
def add_event_to_tree(self, e):
aamode = e.get('aamode', 'UNKNOWN')
if e.get('type', False):
if re.search('(UNKNOWN\[1501\]|APPARMOR_AUDIT|1501)', e['type']):
aamode = 'AUDIT'
elif re.search('(UNKNOWN\[1502\]|APPARMOR_ALLOWED|1502)', e['type']):
aamode = 'PERMITTING'
elif re.search('(UNKNOWN\[1503\]|APPARMOR_DENIED|1503)', e['type']):
aamode = 'REJECTING'
elif re.search('(UNKNOWN\[1504\]|APPARMOR_HINT|1504)', e['type']):
aamode = 'HINT'
elif re.search('(UNKNOWN\[1505\]|APPARMOR_STATUS|1505)', e['type']):
aamode = 'STATUS'
elif re.search('(UNKNOWN\[1506\]|APPARMOR_ERROR|1506)', e['type']):
aamode = 'ERROR'
else:
aamode = 'UNKNOWN'
if aamode in ['UNKNOWN', 'AUDIT', 'STATUS', 'ERROR']:
return None
if 'profile_set' in e['operation']:
return None
# Skip if AUDIT event was issued due to a change_hat in unconfined mode
if not e.get('profile', False):
return None
# Convert new null profiles to old single level null profile
if '//null-' in e['profile']:
e['profile'] = 'null-complain-profile'
profile = e['profile']
hat = None
if '//' in e['profile']:
profile, hat = e['profile'].split('//')[:2]
# Filter out change_hat events that aren't from learning
if e['operation'] == 'change_hat':
if aamode != 'HINT' and aamode != 'PERMITTING':
return None
profile = e['name']
#hat = None
if '//' in e['name']:
profile, hat = e['name'].split('//')[:2]
if not hat:
hat = profile
# prog is no longer passed around consistently
prog = 'HINT'
if profile != 'null-complain-profile' and not self.profile_exists(profile):
return None
if e['operation'] == 'exec':
if e.get('info', False) and e['info'] == 'mandatory profile missing':
self.add_to_tree(e['pid'], e['parent'], 'exec',
[profile, hat, aamode, 'PERMITTING', e['denied_mask'], e['name'], e['name2']])
elif (e.get('name2', False) and '//null-' in e['name2']) or e.get('name', False):
self.add_to_tree(e['pid'], e['parent'], 'exec',
[profile, hat, prog, aamode, e['denied_mask'], e['name'], ''])
else:
self.debug_logger.debug('add_event_to_tree: dropped exec event in %s' % e['profile'])
elif 'file_' in e['operation']:
self.add_to_tree(e['pid'], e['parent'], 'path',
[profile, hat, prog, aamode, e['denied_mask'], e['name'], ''])
elif e['operation'] in ['open', 'truncate', 'mkdir', 'mknod', 'rename_src',
'rename_dest', 'unlink', 'rmdir', 'symlink_create', 'link']:
#print(e['operation'], e['name'])
self.add_to_tree(e['pid'], e['parent'], 'path',
[profile, hat, prog, aamode, e['denied_mask'], e['name'], ''])
elif e['operation'] == 'capable':
self.add_to_tree(e['pid'], e['parent'], 'capability',
[profile, hat, prog, aamode, e['name'], ''])
elif e['operation'] == 'setattr' or 'xattr' in e['operation']:
self.add_to_tree(e['pid'], e['parent'], 'path',
[profile, hat, prog, aamode, e['denied_mask'], e['name'], ''])
elif 'inode_' in e['operation']:
is_domain_change = False
if e['operation'] == 'inode_permission' and (e['denied_mask'] & AA_MAY_EXEC) and aamode == 'PERMITTING':
following = self.peek_at_next_log_entry()
if following:
entry = self.parse_log_record(following)
if entry and entry.get('info', False) == 'set profile':
is_domain_change = True
self.throw_away_next_log_entry()
if is_domain_change:
self.add_to_tree(e['pid'], e['parent'], 'exec',
[profile, hat, prog, aamode, e['denied_mask'], e['name'], e['name2']])
else:
self.add_to_tree(e['pid'], e['parent'], 'path',
[profile, hat, prog, aamode, e['denied_mask'], e['name'], ''])
elif e['operation'] == 'sysctl':
self.add_to_tree(e['pid'], e['parent'], 'path',
[profile, hat, prog, aamode, e['denied_mask'], e['name'], ''])
elif e['operation'] == 'clone':
parent, child = e['pid'], e['task']
if not parent:
parent = 'null-complain-profile'
if not hat:
hat = 'null-complain-profile'
arrayref = []
if self.pid.get(parent, False):
self.pid[parent].append(arrayref)
else:
self.log.append(arrayref)
self.pid[child].append(arrayref)
for ia in ['fork', child, profile, hat]:
arrayref.append(ia)
# if self.pid.get(parent, False):
# self.pid[parent] += [arrayref]
# else:
# self.log += [arrayref]
# self.pid[child] = arrayref
elif self.op_type(e['operation']) == 'net':
self.add_to_tree(e['pid'], e['parent'], 'netdomain',
[profile, hat, prog, aamode, e['family'], e['sock_type'], e['protocol']])
elif e['operation'] == 'change_hat':
self.add_to_tree(e['pid'], e['parent'], 'unknown_hat',
[profile, hat, aamode, hat])
else:
self.debug_logger.debug('UNHANDLED: %s' % e)
def read_log(self, logmark):
self.logmark = logmark
seenmark = True
if self.logmark:
seenmark = False
#last = None
#event_type = None
try:
#print(self.filename)
self.LOG = open_file_read(self.filename)
except IOError:
raise AppArmorException('Can not read AppArmor logfile: ' + self.filename)
#LOG = open_file_read(log_open)
line = True
while line:
line = self.get_next_log_entry()
if not line:
break
line = line.strip()
self.debug_logger.debug('read_log: %s' % line)
if self.logmark in line:
seenmark = True
self.debug_logger.debug('read_log: seenmark = %s' % seenmark)
if not seenmark:
continue
event = self.parse_log_record(line)
#print(event)
if event:
self.add_event_to_tree(event)
self.LOG.close()
self.logmark = ''
return self.log
def op_type(self, operation):
"""Returns the operation type if known, unkown otherwise"""
operation_type = self.OPERATION_TYPES.get(operation, 'unknown')
return operation_type
def profile_exists(self, program):
"""Returns True if profile exists, False otherwise"""
# Check cache of profiles
if self.existing_profiles.get(program, False):
return True
# Check the disk for profile
prof_path = self.get_profile_filename(program)
#print(prof_path)
if os.path.isfile(prof_path):
# Add to cache of profile
self.existing_profiles[program] = prof_path
return True
return False
def get_profile_filename(self, profile):
"""Returns the full profile name"""
if profile.startswith('/'):
# Remove leading /
profile = profile[1:]
else:
profile = "profile_" + profile
profile = profile.replace('/', '.')
full_profilename = self.profile_dir + '/' + profile
return full_profilename
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