mirror of
https://github.com/roddhjav/apparmor.d.git
synced 2024-12-26 15:06:45 +01:00
465 lines
18 KiB
Python
465 lines
18 KiB
Python
#!/usr/bin/env python3
|
|
# SPDX-License-Identifier: GPL-2.0-only
|
|
|
|
# KNOWN ISSUES:
|
|
# No guards for file type - expects AppArmor
|
|
# Diffirent suggestions for single line are mutually exclusive
|
|
# Suggestion could point to changed profile name, based on other suggestion
|
|
|
|
import sys
|
|
import argparse
|
|
import pathlib
|
|
import shlex
|
|
import json
|
|
from copy import deepcopy
|
|
|
|
def sanitizeProfileName(name):
|
|
|
|
if name.startswith('/') or name.startswith('@{'):
|
|
name = pathlib.Path(name).stem
|
|
|
|
if ' ' in name:
|
|
name = re.sub(r'\s+', '-', name)
|
|
|
|
return name
|
|
|
|
def makeLocalIdentity(nestingStacker_):
|
|
|
|
newStacker = []
|
|
for i in nestingStacker_:
|
|
i = sanitizeProfileName(i)
|
|
newStacker.append(i)
|
|
|
|
identity = '_'.join(newStacker) # separate each (sub)profile identity with underscores
|
|
|
|
return identity
|
|
|
|
def getCurrentProfile(stacker):
|
|
|
|
if stacker:
|
|
profile = stacker[-1]
|
|
else:
|
|
profile = None
|
|
|
|
return profile
|
|
|
|
def handleFileMessages(l, file, profile, lineNum):
|
|
|
|
wholeFileAccessProfiles = (
|
|
# '',
|
|
)
|
|
suggestOwner = ( # TODO: switch to AARE
|
|
r'^@{HOME}/',
|
|
r'^/home/\w+/',
|
|
r'^@{run}/user/@{uid}/',
|
|
r'^/run/user/\d+/',
|
|
r'^@{tmp}/',
|
|
r'^/tmp/',
|
|
r'^/var/tmp/',
|
|
r'^/dev/shm/',
|
|
)
|
|
|
|
lG = l.groupdict()
|
|
reason_ = None
|
|
if lG.get('path'):
|
|
if lG.get('path').startswith('/**') and profile not in wholeFileAccessProfiles: # false positives
|
|
severity_ = 'ERROR'
|
|
reason_ = 'Whole filesystem access is too broad'
|
|
suggestion_ = None
|
|
|
|
for r in suggestOwner:
|
|
if re.match(r, lG.get('path')) and not lG.get('owner'):
|
|
indentRe = re.match(r'^\s+', l.group())
|
|
if indentRe:
|
|
indent = indentRe.group()
|
|
else:
|
|
indent = ''
|
|
|
|
severity_ = 'NOTICE'
|
|
reason_ = "'owner' is likely required"
|
|
suggestion_ = indent + 'owner ' + l.group().lstrip()
|
|
break
|
|
|
|
elif lG.get('bare_file') and profile not in wholeFileAccessProfiles:
|
|
severity_ = 'ERROR'
|
|
reason_ = 'Whole filesystem access is too broad'
|
|
suggestion_ = None
|
|
|
|
if reason_: # something matched
|
|
msg = {'filename': file,
|
|
'profile': profile,
|
|
'severity': severity_,
|
|
'line': lineNum,
|
|
'reason': reason_,
|
|
'suggestion': suggestion_}
|
|
else:
|
|
msg = None
|
|
|
|
return msg
|
|
|
|
def readApparmorFile(fullpath):
|
|
'''AA file could contain multiple AA profiles'''
|
|
headers = (
|
|
'# apparmor.d - Full set of apparmor profiles',
|
|
'# Copyright (C) ',
|
|
'# SPDX-License-Identifier: GPL-2.0-only',
|
|
)
|
|
|
|
file_data = {}
|
|
fileVars = {}
|
|
nestingStacker = []
|
|
duplicateProfilesCounter = []
|
|
localExists = {}
|
|
localExists_eol = {}
|
|
messages = []
|
|
exceptionMsg = None
|
|
line = None
|
|
gotAbi = False
|
|
gotHeaders = {}
|
|
gotAttach = False
|
|
isAfterProfileStart = False
|
|
try:
|
|
with open(fullpath, 'r') as f:
|
|
for n,line in enumerate(f, start=1):
|
|
if isAfterProfileStart:
|
|
isAfterProfileStart = False
|
|
expectedIndent = len(nestingStacker) * ' '
|
|
indentRe = re.match(r'^\s+', line)
|
|
if indentRe:
|
|
indent = indentRe.group()
|
|
else:
|
|
indent = ''
|
|
|
|
if indent != expectedIndent:
|
|
spacesCount = len(nestingStacker) * 2
|
|
nestingCount = len(nestingStacker)
|
|
messages.append({'filename': fullpath,
|
|
'profile': getCurrentProfile(nestingStacker),
|
|
'severity': 'WARNING',
|
|
'line': n,
|
|
'reason': f"Expected {spacesCount} spaces for {nestingCount} nesting",
|
|
'suggestion': f"{expectedIndent}{line.lstrip()}"})
|
|
|
|
if line.endswith(' \n'):
|
|
messages.append({'filename': fullpath,
|
|
'profile': getCurrentProfile(nestingStacker),
|
|
'severity': 'WARNING',
|
|
'line': n,
|
|
'reason': "Redundant trailing whitespace",
|
|
'suggestion': line.rstrip()})
|
|
|
|
if '\t' in line:
|
|
messages.append({'filename': fullpath,
|
|
'profile': getCurrentProfile(nestingStacker),
|
|
'severity': 'WARNING',
|
|
'line': n,
|
|
'reason': "Tabs are not allowed",
|
|
'suggestion': line.replace('\t', ' ')})
|
|
|
|
if len(gotHeaders) < 3 and not nestingStacker:
|
|
for nH,i in enumerate(headers):
|
|
if line.startswith(i):
|
|
gotHeaders[nH] = True
|
|
|
|
if RE_ABI.search(line):
|
|
gotAbi = line
|
|
|
|
elif RE_PROFILE_START.search(line) or RE_PROFILE_HAT_DEF.search(line):
|
|
isAfterProfileStart = True
|
|
m = parse_profile_start_line(line, fullpath)
|
|
if m.get('profile'):
|
|
nestingStacker.append(m.get('profile')) # set early
|
|
|
|
if m.get('attachment') != '@{exec_path}' and not gotAttach: # can be only singular
|
|
gotAttach = True
|
|
messages.append({'filename': fullpath,
|
|
'profile': getCurrentProfile(nestingStacker),
|
|
'severity': 'WARNING',
|
|
'line': n,
|
|
'reason': "'@{exec_path}' must be defined as main path attachment",
|
|
'suggestion': None})
|
|
|
|
profileMsg = {'filename': fullpath,
|
|
'profile': getCurrentProfile(nestingStacker),
|
|
'severity': 'WARNING',
|
|
'line': n,
|
|
'reason': "A short named profile must be defined",
|
|
'suggestion': None}
|
|
if m.get('plainprofile'):
|
|
messages.append(profileMsg)
|
|
elif m.get('namedprofile'):
|
|
if m.get('namedprofile').startswith('/'):
|
|
messages.append(profileMsg)
|
|
|
|
if m.get('flags'):
|
|
m['flags'] = set(shlex.split(m.pop('flags').replace(',', '')))
|
|
if 'complain' in m['flags']:
|
|
messages.append({'filename': fullpath,
|
|
'profile': getCurrentProfile(nestingStacker),
|
|
'severity': 'WARNING',
|
|
'line': n,
|
|
'reason': "'complain' flag must be defined in 'dists/flags'",
|
|
'suggestion': None})
|
|
else:
|
|
m['flags'] = set()
|
|
|
|
if m.get('profile'):
|
|
duplicateProfilesCounter.append(m.get('profile'))
|
|
profileIdentity = '//'.join(nestingStacker)
|
|
file_data[profileIdentity] = m
|
|
|
|
elif RE_PROFILE_VARIABLE.search(line):
|
|
lineV = RE_PROFILE_VARIABLE.search(line).groups()
|
|
|
|
name = strip_quotes(lineV[0])
|
|
operation = lineV[1]
|
|
val = separate_vars(lineV[2])
|
|
if fileVars.get(name):
|
|
fileVars[name].update(set(val))
|
|
if operation == '=':
|
|
messages.append({'filename': fullpath,
|
|
'profile': getCurrentProfile(nestingStacker),
|
|
'severity': 'DEGRADED',
|
|
'line': n,
|
|
'reason': "Tunable must be appended with '+='",
|
|
'suggestion': None})
|
|
else:
|
|
fileVars[name] = set(val)
|
|
if operation == '+=':
|
|
messages.append({'filename': fullpath,
|
|
'profile': getCurrentProfile(nestingStacker),
|
|
'severity': 'DEGRADED',
|
|
'line': n,
|
|
'reason': "Tunable must be defined with '='",
|
|
'suggestion': None})
|
|
|
|
elif RE_INCLUDE.search(line):
|
|
if nestingStacker:
|
|
profileIdentity = '//'.join(nestingStacker)
|
|
localIdentity = makeLocalIdentity(nestingStacker)
|
|
localValue = f'include if exists <local/{localIdentity}>' # commented out will also match
|
|
if localValue in line:
|
|
localExists[profileIdentity] = localValue
|
|
|
|
# Handle file entries
|
|
elif RE_PROFILE_FILE_ENTRY.search(line):
|
|
lineF = RE_PROFILE_FILE_ENTRY.search(line)
|
|
fileMsg = handleFileMessages(lineF, fullpath, getCurrentProfile(nestingStacker), n)
|
|
if fileMsg:
|
|
messages.append(fileMsg)
|
|
|
|
elif RE_PROFILE_END.search(line):
|
|
if getCurrentProfile(nestingStacker):
|
|
if not nestingStacker:
|
|
messages.append({'filename': fullpath,
|
|
'profile': None,
|
|
'severity': 'DEGRADED',
|
|
'line': n,
|
|
'reason': "Unbalanced parenthesis?", # not fully covered
|
|
'suggestion': None})
|
|
else:
|
|
profileIdentity = '//'.join(nestingStacker)
|
|
localExists_eol[profileIdentity] = n
|
|
del nestingStacker[-1] # remove last
|
|
|
|
except PermissionError:
|
|
exceptionMsg = 'Unable to read the file (PermissionError)'
|
|
|
|
except UnicodeDecodeError:
|
|
exceptionMsg = 'Unable to read the file (UnicodeDecodeError)'
|
|
|
|
except FileNotFoundError:
|
|
exceptionMsg = 'No such file or directory (FileNotFoundError)'
|
|
|
|
if exceptionMsg:
|
|
messages.append({'filename': fullpath,
|
|
'profile': None,
|
|
'severity': 'NOTICE',
|
|
'line': None,
|
|
'reason': exceptionMsg,
|
|
'suggestion': None})
|
|
|
|
# Ensure proper header is present
|
|
if len(gotHeaders) < 3:
|
|
combinedHeader = '\n'.join(headers)
|
|
messages.append({'filename': fullpath,
|
|
'profile': None,
|
|
'severity': 'WARNING',
|
|
'line': 1,
|
|
'reason': 'No proper header',
|
|
'suggestion': combinedHeader})
|
|
|
|
# Ensure ABI is present
|
|
changeAbi = False
|
|
abi = 'abi <abi/4.0>,'
|
|
if gotAbi:
|
|
if gotAbi.strip() != abi:
|
|
changeAbi = True
|
|
else:
|
|
changeAbi = True
|
|
|
|
if changeAbi:
|
|
messages.append({'filename': fullpath,
|
|
'profile': None,
|
|
'severity': 'WARNING',
|
|
'line': None,
|
|
'reason': 'ABI is required',
|
|
'suggestion': abi})
|
|
|
|
# Ensure trailing vim syntax
|
|
if line:
|
|
trailingSyntax = '# vim:syntax=apparmor'
|
|
if line != trailingSyntax:
|
|
messages.append({'filename': fullpath,
|
|
'profile': None,
|
|
'severity': 'WARNING',
|
|
'line': None,
|
|
'reason': 'No trailing syntax hint',
|
|
'suggestion': trailingSyntax})
|
|
|
|
# Assign variables to profile attachments as paths and assign filenames
|
|
for p,d in deepcopy(file_data).items():
|
|
file_data[p]['filename'] = fullpath
|
|
attachment = d.get('attachment')
|
|
if attachment:
|
|
if attachment.startswith('@{'):
|
|
if fileVars.get(attachment):
|
|
file_data[p]['attach_paths'] = fileVars[attachment] # incoming set
|
|
else:
|
|
messages.append({'filename': fullpath,
|
|
'profile': p,
|
|
'severity': 'ERROR',
|
|
'line': None,
|
|
'reason': f"Unknown global variable as profile attachment: {attachment}",
|
|
'suggestion': None})
|
|
|
|
else:
|
|
if isinstance(file_data[p].get('attachment'), set):
|
|
raise ValueError("Expecting 'str' or 'None', not 'set'")
|
|
file_data[p]['attach_paths'] = {file_data[p]['attachment']}
|
|
|
|
# Check if profile block does not have corresponding 'local' include
|
|
for p,d in file_data.items():
|
|
if not localExists.get(p): # not found previously
|
|
if '//' in p:
|
|
identity = p.split('//')
|
|
else:
|
|
identity = [p]
|
|
|
|
localIdentity = makeLocalIdentity(identity)
|
|
filename = file_data[p]['filename']
|
|
messages.append({'filename': filename,
|
|
'profile': p,
|
|
'severity': 'WARNING',
|
|
'line': localExists_eol.get(p), # None? Unbalanced parenthesis?
|
|
'reason': "The (sub)profile block does not have expected 'local' include",
|
|
'suggestion': f'include if exists <local/{localIdentity}>'})
|
|
|
|
# Track multiple definitions inside single file
|
|
for profile in duplicateProfilesCounter:
|
|
counter = duplicateProfilesCounter.count(profile)
|
|
if counter >= 2:
|
|
messages.append({'filename': fullpath,
|
|
'profile': profile,
|
|
'severity': 'DEGRADED',
|
|
'line': None,
|
|
'reason': "Profile has been defined {counter} times in the same file",
|
|
'suggestion': None})
|
|
|
|
return (messages, file_data)
|
|
|
|
def findAllProfileFilenames(profile_dir):
|
|
|
|
profiles = set()
|
|
for path in pathlib.Path(profile_dir).iterdir():
|
|
if path.is_file() and not is_skippable_file(path):
|
|
profiles.add(path.resolve())
|
|
|
|
# Not default, dig deeper
|
|
if not profiles:
|
|
nestedDirs = (
|
|
'groups',
|
|
'profiles-a-f',
|
|
'profiles-g-l',
|
|
'profiles-m-r',
|
|
'profiles-s-z',
|
|
)
|
|
for d in nestedDirs:
|
|
dirpath = pathlib.Path(pathlib.Path(profile_dir).resolve(), pathlib.Path(d))
|
|
for p in dirpath.rglob("*"):
|
|
if p.is_file():
|
|
profiles.add(p)
|
|
|
|
return profiles
|
|
|
|
def handleArgs():
|
|
"""DEGRADED are purposed for fatal errors - when the profile set will fail to load entirely"""
|
|
|
|
allSeverities = ['DEBUG', 'NOTICE', 'WARNING', 'ERROR', 'CRITICAL', 'DEGRADED']
|
|
aaRoot = '/etc/apparmor.d'
|
|
|
|
parser = argparse.ArgumentParser()
|
|
parser.add_argument('-d', '--aa-root-dir', action='store',
|
|
default=aaRoot,
|
|
help='Target different AppArmor root directory rather than default')
|
|
parser.add_argument('-p', '--profile', action='append',
|
|
help='Handle only specified profile')
|
|
# parser.add_argument('-s', '--severity', action='append',
|
|
# choices=allSeverities,
|
|
# help='Handle only specified severity event')
|
|
|
|
args = parser.parse_args()
|
|
|
|
# if not args.severity:
|
|
# args.severity = allSeverities
|
|
|
|
return args
|
|
|
|
def main(argv):
|
|
|
|
args = handleArgs()
|
|
|
|
messages = []
|
|
|
|
profile_dir = args.aa_root_dir
|
|
if not args.profile:
|
|
profiles = findAllProfileFilenames(profile_dir)
|
|
else:
|
|
profiles = set()
|
|
for p in args.profile:
|
|
absolutePath = pathlib.Path(p).resolve()
|
|
profiles.add(absolutePath)
|
|
|
|
profile_data = {}
|
|
for path in sorted(profiles):
|
|
readApparmorFile_Out = readApparmorFile(path)
|
|
profilesInFile = readApparmorFile_Out[1]
|
|
messages.extend(readApparmorFile_Out[0])
|
|
profile_data.update(profilesInFile)
|
|
|
|
for m in messages:
|
|
m['filename'] = str(m.get('filename'))
|
|
print(json.dumps(m, indent=2))
|
|
|
|
if messages:
|
|
sys.exit(1)
|
|
|
|
return None
|
|
|
|
if __name__ == '__main__':
|
|
|
|
try:
|
|
from apparmor.regex import *
|
|
from apparmor.aa import is_skippable_file
|
|
from apparmor.rule.file import FileRule, FileRuleset
|
|
from apparmor.common import convert_regexp
|
|
try:
|
|
from apparmor.rule.variable import separate_vars
|
|
except ModuleNotFoundError:
|
|
from apparmor.aa import separate_vars
|
|
|
|
except ModuleNotFoundError:
|
|
raise ModuleNotFoundError(f"""Can't find 'python3-apparmor' package! Install with:
|
|
$ sudo apt install python3-apparmor""")
|
|
|
|
main(sys.argv)
|