/usr/lib/python3/dist-packages/apparmor/common.py is in python3-apparmor 2.10.95-0ubuntu2.
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#
# Copyright (C) 2012 Canonical Ltd.
# 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 published by the Free Software Foundation.
#
# ------------------------------------------------------------------
from __future__ import print_function
import codecs
import collections
import glob
import logging
import os
import re
import subprocess
import sys
import termios
import tty
import apparmor.rules as rules
DEBUGGING = False
#
# Utility classes
#
class AppArmorException(Exception):
'''This class represents AppArmor exceptions'''
def __init__(self, value):
self.value = value
def __str__(self):
return repr(self.value)
class AppArmorBug(Exception):
'''This class represents AppArmor exceptions "that should never happen"'''
pass
#
# Utility functions
#
def error(out, exit_code=1, do_exit=True):
'''Print error message and exit'''
try:
print("ERROR: %s" % (out), file=sys.stderr)
except IOError:
pass
if do_exit:
sys.exit(exit_code)
def warn(out):
'''Print warning message'''
try:
print("WARN: %s" % (out), file=sys.stderr)
except IOError:
pass
def msg(out, output=sys.stdout):
'''Print message'''
try:
print("%s" % (out), file=output)
except IOError:
pass
def debug(out):
'''Print debug message'''
global DEBUGGING
if DEBUGGING:
try:
print("DEBUG: %s" % (out), file=sys.stderr)
except IOError:
pass
def recursive_print(src, dpth = 0, key = ''):
# print recursively in a nicely formatted way
# useful for debugging, too verbose for production code ;-)
# based on code "stolen" from Scott S-Allen / MIT License
# http://code.activestate.com/recipes/578094-recursively-print-nested-dictionaries/
""" Recursively prints nested elements."""
tabs = ' ' * dpth * 4 # or 2 or 8 or...
if isinstance(src, dict):
empty = True
for key in src.keys():
print (tabs + '[%s]' % key)
recursive_print(src[key], dpth + 1, key)
empty = False
if empty:
print (tabs + '[--- empty ---]')
elif isinstance(src, list) or isinstance(src, tuple):
if len(src) == 0:
print (tabs + '[--- empty ---]')
else:
print (tabs + "[")
for litem in src:
recursive_print(litem, dpth + 1)
print (tabs + "]")
elif isinstance(src, rules._Raw_Rule):
src.recursive_print(dpth)
else:
if key:
print (tabs + '%s = %s' % (key, src))
else:
print (tabs + '- %s' % src)
def cmd(command):
'''Try to execute the given command.'''
debug(command)
try:
sp = subprocess.Popen(command, stdout=subprocess.PIPE,
stderr=subprocess.STDOUT)
except OSError as ex:
return [127, str(ex)]
if sys.version_info[0] >= 3:
out = sp.communicate()[0].decode('ascii', 'ignore')
else:
out = sp.communicate()[0]
return [sp.returncode, out]
def cmd_pipe(command1, command2):
'''Try to pipe command1 into command2.'''
try:
sp1 = subprocess.Popen(command1, stdout=subprocess.PIPE)
sp2 = subprocess.Popen(command2, stdin=sp1.stdout)
except OSError as ex:
return [127, str(ex)]
if sys.version_info[0] >= 3:
out = sp2.communicate()[0].decode('ascii', 'ignore')
else:
out = sp2.communicate()[0]
return [sp2.returncode, out]
def valid_path(path):
'''Valid path'''
# No relative paths
m = "Invalid path: %s" % (path)
if not path.startswith('/'):
debug("%s (relative)" % (m))
return False
if '"' in path: # We double quote elsewhere
debug("%s (contains quote)" % (m))
return False
try:
os.path.normpath(path)
except Exception:
debug("%s (could not normalize)" % (m))
return False
return True
def get_directory_contents(path):
'''Find contents of the given directory'''
if not valid_path(path):
return None
files = []
for f in glob.glob(path + "/*"):
files.append(f)
files.sort()
return files
def open_file_read(path, encoding='UTF-8'):
'''Open specified file read-only'''
return open_file_anymode('r', path, encoding)
def open_file_write(path):
'''Open specified file in write/overwrite mode'''
return open_file_anymode('w', path, 'UTF-8')
def open_file_anymode(mode, path, encoding='UTF-8'):
'''Open specified file in specified mode'''
errorhandling = 'surrogateescape'
if sys.version_info[0] < 3:
errorhandling = 'replace'
orig = codecs.open(path, mode, encoding, errors=errorhandling)
return orig
def readkey():
'''Returns the pressed key'''
fd = sys.stdin.fileno()
old_settings = termios.tcgetattr(fd)
try:
tty.setraw(sys.stdin.fileno())
ch = sys.stdin.read(1)
finally:
termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)
return ch
def hasher():
'''A neat alternative to perl's hash reference'''
# Creates a dictionary for any depth and returns empty dictionary otherwise
# WARNING: when reading non-existing sub-dicts, empty dicts will be added.
# This might cause strange effects when using .keys()
return collections.defaultdict(hasher)
def convert_regexp(regexp):
regex_paren = re.compile('^(.*){([^}]*)}(.*)$')
regexp = regexp.strip()
new_reg = re.sub(r'(?<!\\)(\.|\+|\$)', r'\\\1', regexp)
while regex_paren.search(new_reg):
match = regex_paren.search(new_reg).groups()
prev = match[0]
after = match[2]
p1 = match[1].replace(',', '|')
new_reg = prev + '(' + p1 + ')' + after
new_reg = new_reg.replace('?', '[^/\000]')
multi_glob = '__KJHDKVZH_AAPROF_INTERNAL_GLOB_SVCUZDGZID__'
new_reg = new_reg.replace('**', multi_glob)
#print(new_reg)
# Match atleast one character if * or ** after /
# ?< is the negative lookback operator
new_reg = new_reg.replace('*', '(((?<=/)[^/\000]+)|((?<!/)[^/\000]*))')
new_reg = new_reg.replace(multi_glob, '(((?<=/)[^\000]+)|((?<!/)[^\000]*))')
if regexp[0] != '^':
new_reg = '^' + new_reg
if regexp[-1] != '$':
new_reg = new_reg + '$'
return new_reg
def user_perm(prof_dir):
if not os.access(prof_dir, os.W_OK):
sys.stdout.write("Cannot write to profile directory.\n" +
"Please run as a user with appropriate permissions.\n")
return False
return True
def type_is_str(var):
''' returns True if the given variable is a str (or unicode string when using python 2)'''
if type(var) == str:
return True
elif sys.version_info[0] < 3 and type(var) == unicode: # python 2 sometimes uses the 'unicode' type
return True
else:
return False
class DebugLogger(object):
def __init__(self, module_name=__name__):
self.debugging = False
self.logfile = '/var/log/apparmor/logprof.log'
self.debug_level = logging.DEBUG
if os.getenv('LOGPROF_DEBUG', False):
self.debugging = os.getenv('LOGPROF_DEBUG')
try:
self.debugging = int(self.debugging)
except Exception:
self.debugging = False
if self.debugging not in range(0, 4):
sys.stdout.write('Environment Variable: LOGPROF_DEBUG contains invalid value: %s'
% os.getenv('LOGPROF_DEBUG'))
if self.debugging == 0: # debugging disabled, don't need to setup logging
return
if self.debugging == 1:
self.debug_level = logging.ERROR
elif self.debugging == 2:
self.debug_level = logging.INFO
elif self.debugging == 3:
self.debug_level = logging.DEBUG
try:
logging.basicConfig(filename=self.logfile, level=self.debug_level,
format='%(asctime)s - %(name)s - %(message)s\n')
except IOError:
# Unable to open the default logfile, so create a temporary logfile and tell use about it
import tempfile
templog = tempfile.NamedTemporaryFile('w', prefix='apparmor', suffix='.log', delete=False)
sys.stdout.write("\nCould not open: %s\nLogging to: %s\n" % (self.logfile, templog.name))
logging.basicConfig(filename=templog.name, level=self.debug_level,
format='%(asctime)s - %(name)s - %(message)s\n')
self.logger = logging.getLogger(module_name)
def error(self, message):
if self.debugging:
self.logger.error(message)
def info(self, message):
if self.debugging:
self.logger.info(message)
def debug(self, message):
if self.debugging:
self.logger.debug(message)
def shutdown(self):
logging.shutdown()
#logging.shutdown([self.logger])
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