88 lines
3.3 KiB
Python
88 lines
3.3 KiB
Python
"""Onionr - Private P2P Communication.
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Prevent eval/exec/os.system and log it
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"""
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import base64
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import platform
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import logger
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from utils import identifyhome
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from onionrexceptions import ArbitraryCodeExec
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"""
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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"""
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def block_system(cmd):
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"""Prevent os.system except for whitelisted commands+contexts."""
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allowed = 'taskkill /PID '
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is_ok = False
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if platform.system() == 'Windows':
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if cmd.startswith(allowed):
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for c in cmd.split(allowed)[1]:
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if not c.isalnum() or c not in ('/', 'F', ' '):
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break
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else:
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is_ok = True
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if not is_ok:
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logger.warn('POSSIBLE EXPLOIT DETECTED, SEE LOGS', terminal=True)
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logger.warn(f'POSSIBLE EXPLOIT: shell command not in whitelist: {cmd}')
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raise ArbitraryCodeExec('os.system command not in whitelist')
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def block_exec(event, info):
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"""Prevent arbitrary code execution in eval/exec and log it."""
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# because libraries have stupid amounts of compile/exec/eval,
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# We have to use a whitelist where it can be tolerated
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# Generally better than nothing, not a silver bullet
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whitelisted_code = [
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'netrc.py',
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'shlex.py',
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'gzip.py',
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'<werkzeug routing>',
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'werkzeug/test.py',
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'multiprocessing/popen_fork.py',
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'multiprocessing/util.py',
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'multiprocessing/connection.py',
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'multiprocessing/queues.py',
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'multiprocessing/synchronize.py',
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'onionrutils/escapeansi.py',
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'stem/connection.py',
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'stem/response/add_onion.py',
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'stem/response/authchallenge.py',
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'stem/response/getinfo.py',
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'stem/response/getconf.py',
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'stem/response/mapaddress.py',
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'stem/response/protocolinfo.py'
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]
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whitelisted_source = []
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home = identifyhome.identify_home()
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code_b64 = base64.b64encode(info[0].co_code).decode()
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if code_b64 in whitelisted_source:
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return
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for source in whitelisted_code:
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if info[0].co_filename.endswith(source):
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return
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if 'plugins/' in info[0].co_filename:
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return
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logger.warn('POSSIBLE EXPLOIT DETECTED, SEE LOGS', terminal=True)
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logger.warn('POSSIBLE EXPLOIT DETECTED: ' + info[0].co_filename)
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logger.warn('Prevented exec/eval. Report this with the sample below')
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logger.warn(f'{event} code in base64 format: {code_b64}')
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raise ArbitraryCodeExec("Arbitrary code (eval/exec) detected.")
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