mirror of
https://github.com/thegeeklab/ansible-later.git
synced 2024-11-15 01:30:40 +00:00
150 lines
5.1 KiB
Python
150 lines
5.1 KiB
Python
# -*- coding:utf-8 -*-
|
|
#
|
|
# Copyright 2014 Hewlett-Packard Development Company, L.P.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
# not use this file except in compliance with the License. You may obtain
|
|
# a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
# License for the specific language governing permissions and limitations
|
|
# under the License.
|
|
|
|
r"""
|
|
========================================
|
|
B609: Test for use of wildcard injection
|
|
========================================
|
|
|
|
Python provides a number of methods that emulate the behavior of standard Linux
|
|
command line utilities. Like their Linux counterparts, these commands may take
|
|
a wildcard "\*" character in place of a file system path. This is interpreted
|
|
to mean "any and all files or folders" and can be used to build partially
|
|
qualified paths, such as "/home/user/\*".
|
|
|
|
The use of partially qualified paths may result in unintended consequences if
|
|
an unexpected file or symlink is placed into the path location given. This
|
|
becomes particularly dangerous when combined with commands used to manipulate
|
|
file permissions or copy data off of a system.
|
|
|
|
This test plugin looks for usage of the following commands in conjunction with
|
|
wild card parameters:
|
|
|
|
- 'chown'
|
|
- 'chmod'
|
|
- 'tar'
|
|
- 'rsync'
|
|
|
|
As well as any method configured in the shell or subprocess injection test
|
|
configurations.
|
|
|
|
|
|
**Config Options:**
|
|
|
|
This plugin test shares a configuration with others in the same family, namely
|
|
`shell_injection`. This configuration is divided up into three sections,
|
|
`subprocess`, `shell` and `no_shell`. They each list Python calls that spawn
|
|
subprocesses, invoke commands within a shell, or invoke commands without a
|
|
shell (by replacing the calling process) respectively.
|
|
|
|
This test will scan parameters of all methods in all sections. Note that
|
|
methods are fully qualified and de-aliased prior to checking.
|
|
|
|
|
|
.. code-block:: yaml
|
|
|
|
shell_injection:
|
|
# Start a process using the subprocess module, or one of its wrappers.
|
|
subprocess:
|
|
- subprocess.Popen
|
|
- subprocess.call
|
|
|
|
# Start a process with a function vulnerable to shell injection.
|
|
shell:
|
|
- os.system
|
|
- os.popen
|
|
- popen2.Popen3
|
|
- popen2.Popen4
|
|
- commands.getoutput
|
|
- commands.getstatusoutput
|
|
# Start a process with a function that is not vulnerable to shell
|
|
injection.
|
|
no_shell:
|
|
- os.execl
|
|
- os.execle
|
|
|
|
|
|
:Example:
|
|
|
|
.. code-block:: none
|
|
|
|
>> Issue: Possible wildcard injection in call: subprocess.Popen
|
|
Severity: High Confidence: Medium
|
|
Location: ./examples/wildcard-injection.py:8
|
|
7 o.popen2('/bin/chmod *')
|
|
8 subp.Popen('/bin/chown *', shell=True)
|
|
9
|
|
|
|
>> Issue: subprocess call - check for execution of untrusted input.
|
|
Severity: Low Confidence: High
|
|
Location: ./examples/wildcard-injection.py:11
|
|
10 # Not vulnerable to wildcard injection
|
|
11 subp.Popen('/bin/rsync *')
|
|
12 subp.Popen("/bin/chmod *")
|
|
|
|
|
|
.. seealso::
|
|
|
|
- https://security.openstack.org
|
|
- https://en.wikipedia.org/wiki/Wildcard_character
|
|
- http://www.defensecode.com/public/DefenseCode_Unix_WildCards_Gone_Wild.txt
|
|
|
|
.. versionadded:: 0.9.0
|
|
|
|
"""
|
|
|
|
import bandit
|
|
from bandit.core import test_properties as test
|
|
from bandit.plugins import injection_shell # NOTE(tkelsey): shared config
|
|
|
|
|
|
gen_config = injection_shell.gen_config
|
|
|
|
|
|
@test.takes_config('shell_injection')
|
|
@test.checks('Call')
|
|
@test.test_id('B609')
|
|
def linux_commands_wildcard_injection(context, config):
|
|
if not ('shell' in config and 'subprocess' in config):
|
|
return
|
|
|
|
vulnerable_funcs = ['chown', 'chmod', 'tar', 'rsync']
|
|
if context.call_function_name_qual in config['shell'] or (
|
|
context.call_function_name_qual in config['subprocess'] and
|
|
context.check_call_arg_value('shell', 'True')):
|
|
if context.call_args_count >= 1:
|
|
call_argument = context.get_call_arg_at_position(0)
|
|
argument_string = ''
|
|
if isinstance(call_argument, list):
|
|
for li in call_argument:
|
|
argument_string = argument_string + ' %s' % li
|
|
elif isinstance(call_argument, str):
|
|
argument_string = call_argument
|
|
|
|
if argument_string != '':
|
|
for vulnerable_func in vulnerable_funcs:
|
|
if(
|
|
vulnerable_func in argument_string and
|
|
'*' in argument_string
|
|
):
|
|
return bandit.Issue(
|
|
severity=bandit.HIGH,
|
|
confidence=bandit.MEDIUM,
|
|
text="Possible wildcard injection in call: %s" %
|
|
context.call_function_name_qual,
|
|
lineno=context.get_lineno_for_call_arg('shell'),
|
|
)
|