/usr/lib/python3/dist-packages/apparmor/aamode.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>
#
# 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.common import AppArmorBug
def AA_OTHER(mode):
other = set()
for i in mode:
other.add('::%s' % i)
return other
def AA_OTHER_REMOVE(mode):
other = set()
for i in mode:
if '::' in i:
other.add(i[2:])
return other
AA_MAY_EXEC = set('x')
AA_MAY_WRITE = set('w')
AA_MAY_READ = set('r')
AA_MAY_APPEND = set('a')
AA_MAY_LINK = set('l')
AA_MAY_LOCK = set('k')
AA_EXEC_MMAP = set('m')
AA_EXEC_UNSAFE = set(['execunsafe'])
AA_EXEC_INHERIT = set('i')
AA_EXEC_UNCONFINED = set('U')
AA_EXEC_PROFILE = set('P')
AA_EXEC_CHILD = set('C')
AA_EXEC_NT = set('N')
AA_LINK_SUBSET = set(['linksubset'])
AA_BARE_FILE_MODE = set(['bare_file_mode'])
#AA_OTHER_SHIFT = 14
#AA_USER_MASK = 16384 - 1
AA_EXEC_TYPE = (AA_MAY_EXEC | AA_EXEC_UNSAFE | AA_EXEC_INHERIT |
AA_EXEC_UNCONFINED | AA_EXEC_PROFILE | AA_EXEC_CHILD | AA_EXEC_NT)
ALL_AA_EXEC_TYPE = AA_EXEC_TYPE
MODE_HASH = {'x': AA_MAY_EXEC, 'X': AA_MAY_EXEC,
'w': AA_MAY_WRITE, 'W': AA_MAY_WRITE,
'r': AA_MAY_READ, 'R': AA_MAY_READ,
'a': AA_MAY_APPEND, 'A': AA_MAY_APPEND,
'l': AA_MAY_LINK, 'L': AA_MAY_LINK,
'k': AA_MAY_LOCK, 'K': AA_MAY_LOCK,
'm': AA_EXEC_MMAP, 'M': AA_EXEC_MMAP,
'i': AA_EXEC_INHERIT, 'I': AA_EXEC_INHERIT,
'u': AA_EXEC_UNCONFINED | AA_EXEC_UNSAFE, # Unconfined + Unsafe
'U': AA_EXEC_UNCONFINED,
'p': AA_EXEC_PROFILE | AA_EXEC_UNSAFE, # Profile + unsafe
'P': AA_EXEC_PROFILE,
'c': AA_EXEC_CHILD | AA_EXEC_UNSAFE, # Child + Unsafe
'C': AA_EXEC_CHILD,
'n': AA_EXEC_NT | AA_EXEC_UNSAFE,
'N': AA_EXEC_NT
}
LOG_MODE_RE = re.compile('^(r|w|l|m|k|a|x|ix|ux|px|pux|cx|nx|pix|cix|Ux|Px|PUx|Cx|Nx|Pix|Cix)+$')
MODE_MAP_SET = {"r", "w", "l", "m", "k", "a", "x", "i", "u", "p", "c", "n", "I", "U", "P", "C", "N"}
def str_to_mode(string):
if not string:
return set()
user, other = split_log_mode(string)
if not user:
user = other
mode = sub_str_to_mode(user)
#print(string, mode)
#print(string, 'other', sub_str_to_mode(other))
mode |= (AA_OTHER(sub_str_to_mode(other)))
#print (string, mode)
#print('str_to_mode:', mode)
return mode
def sub_str_to_mode(string):
mode = set()
for mode_char in string:
if mode_char in MODE_MAP_SET and MODE_HASH.get(mode_char, False):
mode |= MODE_HASH[mode_char]
else:
raise AppArmorBug("Mode string '%s' contains invalid char '%s'" % (string, mode_char))
return mode
def split_log_mode(mode):
#if the mode has a "::", then the left side is the user mode, and the right side is the other mode
#if not, then the mode is both the user and other mode
user = ''
other = ''
if "::" in mode:
try:
user, other = mode.split("::")
except ValueError as e:
raise AppArmorBug("Got ValueError '%s' when splitting %s" % (str(e), mode))
else:
user = mode
other = mode
return user, other
def mode_contains(mode, subset):
# w implies a
if mode & AA_MAY_WRITE:
mode |= AA_MAY_APPEND
if mode & (AA_OTHER(AA_MAY_WRITE)):
mode |= (AA_OTHER(AA_MAY_APPEND))
return (mode & subset) == subset
def contains(mode, string):
return mode_contains(mode, str_to_mode(string))
def validate_log_mode(mode):
if LOG_MODE_RE.search(mode):
return True
else:
return False
def hide_log_mode(mode):
mode = mode.replace('::', '')
return mode
def print_mode(mode):
user, other = split_mode(mode)
string = sub_mode_to_str(user) + '::' + sub_mode_to_str(other)
return string
def sub_mode_to_str(mode):
string = ''
# w(write) implies a(append)
if mode & AA_MAY_WRITE:
mode = mode - AA_MAY_APPEND
#string = ''.join(mode)
if mode & AA_EXEC_MMAP:
string += 'm'
if mode & AA_MAY_READ:
string += 'r'
if mode & AA_MAY_WRITE:
string += 'w'
if mode & AA_MAY_APPEND:
string += 'a'
if mode & AA_MAY_LINK:
string += 'l'
if mode & AA_MAY_LOCK:
string += 'k'
# modes P and C must appear before I and U else invalid syntax
if mode & (AA_EXEC_PROFILE | AA_EXEC_NT):
if mode & AA_EXEC_UNSAFE:
string += 'p'
else:
string += 'P'
if mode & AA_EXEC_CHILD:
if mode & AA_EXEC_UNSAFE:
string += 'c'
else:
string += 'C'
if mode & AA_EXEC_UNCONFINED:
if mode & AA_EXEC_UNSAFE:
string += 'u'
else:
string += 'U'
if mode & AA_EXEC_INHERIT:
string += 'i'
if mode & AA_MAY_EXEC:
string += 'x'
return string
def is_user_mode(mode):
user, other = split_mode(mode)
if user and not other:
return True
else:
return False
def split_mode(mode):
user = set()
for i in mode:
if not '::' in i:
user.add(i)
other = mode - user
other = AA_OTHER_REMOVE(other)
return user, other
def mode_to_str(mode):
mode = flatten_mode(mode)
return sub_mode_to_str(mode)
def flatten_mode(mode):
if not mode:
return set()
user, other = split_mode(mode)
mode = user | other
mode |= (AA_OTHER(mode))
return mode
def owner_flatten_mode(mode):
mode = flatten_mode(mode)
return mode
def mode_to_str_user(mode):
user, other = split_mode(mode)
string = ''
if not user:
user = set()
if not other:
other = set()
if user - other:
if other:
string = sub_mode_to_str(other) + '+'
string += 'owner ' + sub_mode_to_str(user - other)
elif is_user_mode(mode):
string = 'owner ' + sub_mode_to_str(user)
else:
string = sub_mode_to_str(flatten_mode(mode))
return string
def log_str_to_mode(profile, string, nt_name):
mode = str_to_mode(string)
# If contains nx and nix
#print (profile, string, nt_name)
if contains(mode, 'Nx'):
# Transform to px, cx
match = re.search('(.+?)//(.+?)', nt_name)
if match:
lprofile, lhat = match.groups()
tmode = 0
if lprofile == profile:
if mode & AA_MAY_EXEC:
tmode = str_to_mode('Cx::')
if mode & AA_OTHER(AA_MAY_EXEC):
tmode |= str_to_mode('Cx')
nt_name = lhat
else:
if mode & AA_MAY_EXEC:
tmode = str_to_mode('Px::')
if mode & AA_OTHER(AA_MAY_EXEC):
tmode |= str_to_mode('Px')
nt_name = lhat
mode = mode - str_to_mode('Nx')
mode |= tmode
return mode, nt_name
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