mirror of
https://gitlab.com/apparmor/apparmor.git
synced 2025-03-06 17:31:01 +01:00
178 lines
7.4 KiB
Python
178 lines
7.4 KiB
Python
#!/usr/bin/python
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#
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# Copyright (C) 2012 Canonical Ltd.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of version 2 of the GNU General Public
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# License published by the Free Software Foundation.
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#
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# Written by Steve Beattie <steve@nxnw.org>, based on work by
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# Christian Boltz <apparmor@cboltz.de>
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from __future__ import with_statement
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import re
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import subprocess
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import sys
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# dangerous capabilities
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danger_caps=["audit_control",
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"audit_write",
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"mac_override",
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"mac_admin",
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"set_fcap",
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"sys_admin",
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"sys_module",
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"sys_rawio"]
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def cmd(command, input = None, stderr = subprocess.STDOUT, stdout = subprocess.PIPE, stdin = None, timeout = None):
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'''Try to execute given command (array) and return its stdout, or
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return a textual error if it failed.'''
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try:
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sp = subprocess.Popen(command, stdin=stdin, stdout=stdout, stderr=stderr, close_fds=True, universal_newlines=True)
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except OSError as ex:
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return [127, str(ex)]
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out, outerr = sp.communicate(input)
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# Handle redirection of stdout
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if out == None:
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out = ''
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# Handle redirection of stderr
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if outerr == None:
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outerr = ''
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return [sp.returncode,out+outerr]
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# get capabilities list
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(rc, output) = cmd(['make', '-s', '--no-print-directory', 'list_capabilities'])
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if rc != 0:
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sys.stderr.write("make list_capabilities failed: " + output)
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exit(rc)
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capabilities = re.sub('CAP_', '', output.strip()).lower().split(" ")
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benign_caps =[]
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for cap in capabilities:
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if cap not in danger_caps:
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benign_caps.append(cap)
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# get network protos list
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(rc, output) = cmd(['make', '-s', '--no-print-directory', 'list_af_names'])
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if rc != 0:
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sys.stderr.write("make list_af_names failed: " + output)
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exit(rc)
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af_names = []
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af_pairs = re.sub('AF_', '', output.strip()).lower().split(",")
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for af_pair in af_pairs:
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af_name = af_pair.lstrip().split(" ")[0]
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# skip max af name definition
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if len(af_name) > 0 and af_name != "max":
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af_names.append(af_name)
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# TODO: does a "debug" flag exist? Listed in apparmor.vim.in sdFlagKey,
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# but not in aa_flags...
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# -> currently (2011-01-11) not, but might come back
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aa_network_types=r'\s+tcp|\s+udp|\s+icmp'
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aa_flags=['complain',
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'audit',
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'attach_disconnect',
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'no_attach_disconnected',
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'chroot_attach',
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'chroot_no_attach',
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'chroot_relative',
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'namespace_relative']
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filename=r'(\/|\@\{\S*\})\S*'
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aa_regex_map = {
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'FILENAME': filename,
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'FILE': r'\v^\s*(audit\s+)?(deny\s+)?(owner\s+)?' + filename + r'\s+', # Start of a file rule
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# (whitespace_+_, owner etc. flag_?_, filename pattern, whitespace_+_)
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'DENYFILE': r'\v^\s*(audit\s+)?deny\s+(owner\s+)?' + filename + r'\s+', # deny, otherwise like FILE
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'auditdenyowner': r'(audit\s+)?(deny\s+)?(owner\s+)?',
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'audit_DENY_owner': r'(audit\s+)?deny\s+(owner\s+)?', # must include "deny", otherwise like auditdenyowner
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'auditdeny': r'(audit\s+)?(deny\s+)?',
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'EOL': r'\s*,(\s*$|(\s*#.*$)\@=)', # End of a line (whitespace_?_, comma, whitespace_?_ comment.*)
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'TRANSITION': r'(\s+-\>\s+\S+)?',
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'sdKapKey': " ".join(benign_caps),
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'sdKapKeyDanger': " ".join(danger_caps),
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'sdKapKeyRegex': "|".join(capabilities),
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'sdNetworkType': aa_network_types,
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'sdNetworkProto': "|".join(af_names),
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'flags': r'((flags\s*\=\s*)?\(\s*(' + '|'.join(aa_flags) + r')(\s*,\s*(' + '|'.join(aa_flags) + r'))*\s*\)\s+)',
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}
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def my_repl(matchobj):
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matchobj.group(1)
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if matchobj.group(1) in aa_regex_map:
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return aa_regex_map[matchobj.group(1)]
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return matchobj.group(0)
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def create_file_rule (highlighting, permissions, comment, denyrule = 0):
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if denyrule == 0:
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keywords = '@@auditdenyowner@@'
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else:
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keywords = '@@audit_DENY_owner@@' # TODO: not defined yet, will be '(audit\s+)?deny\s+(owner\s+)?'
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sniplet = ''
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sniplet = sniplet + "\n" + '" ' + comment + "\n"
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prefix = r'syn match ' + highlighting + r' /\v^\s*' + keywords
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suffix = r'@@EOL@@/ contains=sdGlob,sdComment nextgroup=@sdEntry,sdComment,sdError,sdInclude' + "\n"
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# filename without quotes
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sniplet = sniplet + prefix + r'@@FILENAME@@\s+' + permissions + suffix
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# filename with quotes
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sniplet = sniplet + prefix + r'"@@FILENAME@@"\s+' + permissions + suffix
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# filename without quotes, reverse syntax
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sniplet = sniplet + prefix + permissions + r'\s+@@FILENAME@@' + suffix
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# filename with quotes, reverse syntax
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sniplet = sniplet + prefix + permissions + r'\s+"@@FILENAME@@"+' + suffix
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return sniplet
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filerule = ''
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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)' )
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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' )
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filerule = filerule + create_file_rule ( 'sdEntryUXe', r'(r|m|k|Ux|PUx)+@@TRANSITION@@', 'Ux(mr) and PUx(mr) - like ux + clean environment' )
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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' )
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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' )
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filerule = filerule + create_file_rule ( 'sdEntryIX', r'(r|m|k|ix)+', 'ix(mr) - standard exec entry, flag the line green' )
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filerule = filerule + create_file_rule ( 'sdEntryM', r'(r|m|k)+', 'mr - mmap with PROT_EXEC' )
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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)
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#syn match sdEntryM /@@DENYFILE@@(r|m|k|x)+@@EOL@@/ contains=sdGlob,sdComment nextgroup=@sdEntry,sdComment,sdError,sdInclude
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filerule = filerule + create_file_rule ( 'sdError', r'\S*(w\S*a|a\S*w)\S*', 'write + append is an error' )
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filerule = filerule + create_file_rule ( 'sdEntryW', r'(l|r|w|k)+', 'write entry, flag the line yellow' )
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filerule = filerule + create_file_rule ( 'sdEntryW', r'(l|r|a|k)+', 'append entry, flag the line yellow' )
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filerule = filerule + create_file_rule ( 'sdEntryK', r'[rlk]+', 'read entry + locking, currently no highlighting' )
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filerule = filerule + create_file_rule ( 'sdEntryR', r'[rl]+', 'read entry, no highlighting' )
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# " special case: deny x is allowed (doesn't need to be ix, px, ux or cx)
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# syn match sdEntryM /@@DENYFILE@@(r|m|k|x)+@@EOL@@/ contains=sdGlob,sdComment nextgroup=@sdEntry,sdComment,sdError,sdInclude
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# " TODO: Support filenames enclosed in quotes ("/home/foo/My Documents/") - ideally by only allowing quotes pair-wise
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regex = "@@(" + "|".join(aa_regex_map) + ")@@"
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sys.stdout.write('" generated from apparmor.vim.in by create-apparmor.vim.py\n')
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sys.stdout.write('" do not edit this file - edit apparmor.vim.in or create-apparmor.vim.py instead' + "\n\n")
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with open("apparmor.vim.in") as template:
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for line in template:
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line = re.sub(regex, my_repl, line.rstrip())
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sys.stdout.write('%s\n' % line)
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sys.stdout.write("\n\n\n\n")
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sys.stdout.write('" file rules added with create_file_rule()\n')
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sys.stdout.write(re.sub(regex, my_repl, filerule)+'\n')
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