#!/usr/bin/python # # Copyright (C) 2012 Canonical Ltd. # # 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. # # Written by Steve Beattie , based on work by # Christian Boltz from __future__ import with_statement import re import subprocess import sys # dangerous capabilities danger_caps = ["audit_control", "audit_write", "mac_override", "mac_admin", "set_fcap", "sys_admin", "sys_module", "sys_rawio"] def cmd(command, input=None, stderr=subprocess.STDOUT, stdout=subprocess.PIPE, stdin=None, timeout=None): '''Try to execute given command (array) and return its stdout, or return a textual error if it failed.''' try: sp = subprocess.Popen(command, stdin=stdin, stdout=stdout, stderr=stderr, close_fds=True, universal_newlines=True) except OSError as ex: return [127, str(ex)] out, outerr = sp.communicate(input) # Handle redirection of stdout if out is None: out = '' # Handle redirection of stderr if outerr is None: outerr = '' return [sp.returncode, out + outerr] # get capabilities list (rc, output) = cmd(['make', '-s', '--no-print-directory', 'list_capabilities']) if rc != 0: sys.stderr.write("make list_capabilities failed: " + output) exit(rc) capabilities = re.sub('CAP_', '', output.strip()).lower().split(" ") benign_caps = [] for cap in capabilities: if cap not in danger_caps: benign_caps.append(cap) # get network protos list (rc, output) = cmd(['../../common/list_af_names.sh']) if rc != 0: sys.stderr.write("make list_af_names failed: " + output) exit(rc) af_names = [] af_pairs = re.sub('AF_', '', output.strip()).lower().split(",") for af_pair in af_pairs: af_name = af_pair.lstrip().split(" ")[0] # skip max af name definition if len(af_name) > 0 and af_name != "max": af_names.append(af_name) # TODO: does a "debug" flag exist? Listed in apparmor.vim.in sdFlagKey, # but not in aa_flags... # -> currently (2011-01-11) not, but might come back aa_network_types = r'\s+tcp|\s+udp|\s+icmp' aa_flags = ['complain', 'audit', 'attach_disconnected', 'no_attach_disconnected', 'chroot_attach', 'chroot_no_attach', 'chroot_relative', 'namespace_relative', 'mediate_deleted', 'delegate_deleted'] filename = r'(\/|\@\{\S*\})\S*' aa_regex_map = { 'FILENAME': filename, 'FILE': r'\v^\s*(audit\s+)?(deny\s+|allow\s+)?(owner\s+|other\s+)?' + filename + r'\s+', # Start of a file rule # (whitespace_+_, owner etc. flag_?_, filename pattern, whitespace_+_) 'DENYFILE': r'\v^\s*(audit\s+)?deny\s+(owner\s+|other\s+)?' + filename + r'\s+', # deny, otherwise like FILE 'auditdenyowner': r'(audit\s+)?(deny\s+|allow\s+)?(owner\s+|other\s+)?', 'audit_DENY_owner': r'(audit\s+)?deny\s+(owner\s+|other\s+)?', # must include "deny", otherwise like auditdenyowner 'auditdeny': r'(audit\s+)?(deny\s+|allow\s+)?', 'EOL': r'\s*,(\s*$|(\s*#.*$)\@=)', # End of a line (whitespace_?_, comma, whitespace_?_ comment.*) 'TRANSITION': r'(\s+-\>\s+\S+)?', 'sdKapKey': " ".join(benign_caps), 'sdKapKeyDanger': " ".join(danger_caps), 'sdKapKeyRegex': "|".join(capabilities), 'sdNetworkType': aa_network_types, 'sdNetworkProto': "|".join(af_names), 'flags': r'((flags\s*\=\s*)?\(\s*(' + '|'.join(aa_flags) + r')(\s*,\s*(' + '|'.join(aa_flags) + r'))*\s*\)\s+)', } def my_repl(matchobj): matchobj.group(1) if matchobj.group(1) in aa_regex_map: return aa_regex_map[matchobj.group(1)] return matchobj.group(0) def create_file_rule(highlighting, permissions, comment, denyrule=0): if denyrule == 0: keywords = '@@auditdenyowner@@' else: keywords = '@@audit_DENY_owner@@' # TODO: not defined yet, will be '(audit\s+)?deny\s+(owner\s+)?' sniplet = '' sniplet = sniplet + "\n" + '" ' + comment + "\n" prefix = r'syn match ' + highlighting + r' /\v^\s*' + keywords suffix = r'@@EOL@@/ contains=sdGlob,sdComment nextgroup=@sdEntry,sdComment,sdError,sdInclude' + "\n" # filename without quotes sniplet = sniplet + prefix + r'@@FILENAME@@\s+' + permissions + suffix # filename with quotes sniplet = sniplet + prefix + r'"@@FILENAME@@"\s+' + permissions + suffix # filename without quotes, reverse syntax sniplet = sniplet + prefix + permissions + r'\s+@@FILENAME@@' + suffix # filename with quotes, reverse syntax sniplet = sniplet + prefix + permissions + r'\s+"@@FILENAME@@"+' + suffix return sniplet filerule = '' filerule = filerule + create_file_rule('sdEntryWriteExec ', r'(l|r|w|a|m|k|[iuUpPcC]x)+@@TRANSITION@@', 'write + exec/mmap - danger! (known bug: accepts aw to keep things simple)') filerule = filerule + create_file_rule('sdEntryUX', r'(r|m|k|ux|pux)+@@TRANSITION@@', 'ux(mr) - unconstrained entry, flag the line red. also includes pux which is unconstrained if no profile exists') filerule = filerule + create_file_rule('sdEntryUXe', r'(r|m|k|Ux|PUx)+@@TRANSITION@@', 'Ux(mr) and PUx(mr) - like ux + clean environment') filerule = filerule + create_file_rule('sdEntryPX', r'(r|m|k|px|cx|pix|cix)+@@TRANSITION@@', 'px/cx/pix/cix(mrk) - standard exec entry, flag the line blue') filerule = filerule + create_file_rule('sdEntryPXe', r'(r|m|k|Px|Cx|Pix|Cix)+@@TRANSITION@@', 'Px/Cx/Pix/Cix(mrk) - like px/cx + clean environment') filerule = filerule + create_file_rule('sdEntryIX', r'(r|m|k|ix)+', 'ix(mr) - standard exec entry, flag the line green') filerule = filerule + create_file_rule('sdEntryM', r'(r|m|k)+', 'mr - mmap with PROT_EXEC') filerule = filerule + create_file_rule('sdEntryM', r'(r|m|k|x)+', 'special case: deny x is allowed (does not need to be ix, px, ux or cx)', 1) #syn match sdEntryM /@@DENYFILE@@(r|m|k|x)+@@EOL@@/ contains=sdGlob,sdComment nextgroup=@sdEntry,sdComment,sdError,sdInclude filerule = filerule + create_file_rule('sdError', r'\S*(w\S*a|a\S*w)\S*', 'write + append is an error') filerule = filerule + create_file_rule('sdEntryW', r'(l|r|w|k)+', 'write entry, flag the line yellow') filerule = filerule + create_file_rule('sdEntryW', r'(l|r|a|k)+', 'append entry, flag the line yellow') filerule = filerule + create_file_rule('sdEntryK', r'[rlk]+', 'read entry + locking, currently no highlighting') filerule = filerule + create_file_rule('sdEntryR', r'[rl]+', 'read entry, no highlighting') # " special case: deny x is allowed (doesn't need to be ix, px, ux or cx) # syn match sdEntryM /@@DENYFILE@@(r|m|k|x)+@@EOL@@/ contains=sdGlob,sdComment nextgroup=@sdEntry,sdComment,sdError,sdInclude # " TODO: Support filenames enclosed in quotes ("/home/foo/My Documents/") - ideally by only allowing quotes pair-wise regex = "@@(" + "|".join(aa_regex_map) + ")@@" sys.stdout.write('" generated from apparmor.vim.in by create-apparmor.vim.py\n') sys.stdout.write('" do not edit this file - edit apparmor.vim.in or create-apparmor.vim.py instead' + "\n\n") with open("apparmor.vim.in") as template: for line in template: line = re.sub(regex, my_repl, line.rstrip()) sys.stdout.write('%s\n' % line) sys.stdout.write("\n\n\n\n") sys.stdout.write('" file rules added with create_file_rule()\n') sys.stdout.write(re.sub(regex, my_repl, filerule) + '\n')