kopia lustrzana https://github.com/ytdl-org/youtube-dl
[core,utils] Implement unsafe file extension mitigation
* from https://github.com/yt-dlp/yt-dlp/security/advisories/GHSA-79w7-vh3h-8g4, thx grub4kpull/32841/head
dirkf
rodzic
3c466186a8
commit
4652109643
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@ -14,9 +14,11 @@ sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
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import io
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import itertools
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import json
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import types
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import xml.etree.ElementTree
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from youtube_dl.utils import (
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_UnsafeExtensionError,
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age_restricted,
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args_to_str,
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base_url,
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@ -270,6 +272,27 @@ class TestUtil(unittest.TestCase):
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expand_path('~/%s' % env('YOUTUBE_DL_EXPATH_PATH')),
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'%s/expanded' % compat_getenv('HOME'))
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_uncommon_extensions = [
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('exe', 'abc.exe.ext'),
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('de', 'abc.de.ext'),
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('../.mp4', None),
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('..\\.mp4', None),
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]
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def assertUnsafeExtension(self, ext=None):
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assert_raises = self.assertRaises(_UnsafeExtensionError)
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assert_raises.ext = ext
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orig_exit = assert_raises.__exit__
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def my_exit(self_, exc_type, exc_val, exc_tb):
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did_raise = orig_exit(exc_type, exc_val, exc_tb)
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if did_raise and assert_raises.ext is not None:
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self.assertEqual(assert_raises.ext, assert_raises.exception.extension, 'Unsafe extension not as unexpected')
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return did_raise
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assert_raises.__exit__ = types.MethodType(my_exit, assert_raises)
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return assert_raises
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def test_prepend_extension(self):
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self.assertEqual(prepend_extension('abc.ext', 'temp'), 'abc.temp.ext')
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self.assertEqual(prepend_extension('abc.ext', 'temp', 'ext'), 'abc.temp.ext')
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@ -278,6 +301,19 @@ class TestUtil(unittest.TestCase):
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self.assertEqual(prepend_extension('.abc', 'temp'), '.abc.temp')
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self.assertEqual(prepend_extension('.abc.ext', 'temp'), '.abc.temp.ext')
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# Test uncommon extensions
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self.assertEqual(prepend_extension('abc.ext', 'bin'), 'abc.bin.ext')
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for ext, result in self._uncommon_extensions:
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with self.assertUnsafeExtension(ext):
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prepend_extension('abc', ext)
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if result:
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self.assertEqual(prepend_extension('abc.ext', ext, 'ext'), result)
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else:
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with self.assertUnsafeExtension(ext):
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prepend_extension('abc.ext', ext, 'ext')
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with self.assertUnsafeExtension(ext):
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prepend_extension('abc.unexpected_ext', ext, 'ext')
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def test_replace_extension(self):
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self.assertEqual(replace_extension('abc.ext', 'temp'), 'abc.temp')
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self.assertEqual(replace_extension('abc.ext', 'temp', 'ext'), 'abc.temp')
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@ -286,6 +322,16 @@ class TestUtil(unittest.TestCase):
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self.assertEqual(replace_extension('.abc', 'temp'), '.abc.temp')
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self.assertEqual(replace_extension('.abc.ext', 'temp'), '.abc.temp')
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# Test uncommon extensions
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self.assertEqual(replace_extension('abc.ext', 'bin'), 'abc.unknown_video')
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for ext, _ in self._uncommon_extensions:
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with self.assertUnsafeExtension(ext):
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replace_extension('abc', ext)
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with self.assertUnsafeExtension(ext):
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replace_extension('abc.ext', ext, 'ext')
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with self.assertUnsafeExtension(ext):
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replace_extension('abc.unexpected_ext', ext, 'ext')
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def test_subtitles_filename(self):
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self.assertEqual(subtitles_filename('abc.ext', 'en', 'vtt'), 'abc.en.vtt')
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self.assertEqual(subtitles_filename('abc.ext', 'en', 'vtt', 'ext'), 'abc.en.vtt')
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@ -7,6 +7,7 @@ import collections
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import copy
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import datetime
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import errno
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import functools
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import io
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import itertools
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import json
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@ -53,6 +54,7 @@ from .compat import (
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compat_urllib_request_DataHandler,
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)
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from .utils import (
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_UnsafeExtensionError,
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age_restricted,
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args_to_str,
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bug_reports_message,
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@ -129,6 +131,20 @@ if compat_os_name == 'nt':
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import ctypes
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def _catch_unsafe_file_extension(func):
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@functools.wraps(func)
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def wrapper(self, *args, **kwargs):
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try:
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return func(self, *args, **kwargs)
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except _UnsafeExtensionError as error:
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self.report_error(
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'{0} found; to avoid damaging your system, this value is disallowed.'
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' If you believe this is an error{1}').format(
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error.message, bug_reports_message(','))
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return wrapper
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class YoutubeDL(object):
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"""YoutubeDL class.
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@ -1925,6 +1941,7 @@ class YoutubeDL(object):
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if self.params.get('forcejson', False):
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self.to_stdout(json.dumps(self.sanitize_info(info_dict)))
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@_catch_unsafe_file_extension
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def process_info(self, info_dict):
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"""Process a single resolved IE result."""
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@ -1717,39 +1717,6 @@ TIMEZONE_NAMES = {
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'PST': -8, 'PDT': -7 # Pacific
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}
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class Namespace(object):
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"""Immutable namespace"""
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def __init__(self, **kw_attr):
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self.__dict__.update(kw_attr)
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def __iter__(self):
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return iter(self.__dict__.values())
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@property
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def items_(self):
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return self.__dict__.items()
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MEDIA_EXTENSIONS = Namespace(
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common_video=('avi', 'flv', 'mkv', 'mov', 'mp4', 'webm'),
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video=('3g2', '3gp', 'f4v', 'mk3d', 'divx', 'mpg', 'ogv', 'm4v', 'wmv'),
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common_audio=('aiff', 'alac', 'flac', 'm4a', 'mka', 'mp3', 'ogg', 'opus', 'wav'),
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audio=('aac', 'ape', 'asf', 'f4a', 'f4b', 'm4b', 'm4p', 'm4r', 'oga', 'ogx', 'spx', 'vorbis', 'wma', 'weba'),
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thumbnails=('jpg', 'png', 'webp'),
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# storyboards=('mhtml', ),
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subtitles=('srt', 'vtt', 'ass', 'lrc', 'ttml'),
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manifests=('f4f', 'f4m', 'm3u8', 'smil', 'mpd'),
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)
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MEDIA_EXTENSIONS.video = MEDIA_EXTENSIONS.common_video + MEDIA_EXTENSIONS.video
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MEDIA_EXTENSIONS.audio = MEDIA_EXTENSIONS.common_audio + MEDIA_EXTENSIONS.audio
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KNOWN_EXTENSIONS = (
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MEDIA_EXTENSIONS.video + MEDIA_EXTENSIONS.audio
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+ MEDIA_EXTENSIONS.manifests
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)
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# needed for sanitizing filenames in restricted mode
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ACCENT_CHARS = dict(zip('ÂÃÄÀÁÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖŐØŒÙÚÛÜŰÝÞßàáâãäåæçèéêëìíîïðñòóôõöőøœùúûüűýþÿ',
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itertools.chain('AAAAAA', ['AE'], 'CEEEEIIIIDNOOOOOOO', ['OE'], 'UUUUUY', ['TH', 'ss'],
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@ -3977,19 +3944,22 @@ def parse_duration(s):
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return duration
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def prepend_extension(filename, ext, expected_real_ext=None):
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def _change_extension(prepend, filename, ext, expected_real_ext=None):
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name, real_ext = os.path.splitext(filename)
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return (
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'{0}.{1}{2}'.format(name, ext, real_ext)
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if not expected_real_ext or real_ext[1:] == expected_real_ext
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else '{0}.{1}'.format(filename, ext))
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sanitize_extension = _UnsafeExtensionError.sanitize_extension
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if not expected_real_ext or real_ext.partition('.')[0::2] == ('', expected_real_ext):
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filename = name
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if prepend and real_ext:
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sanitize_extension(ext, prepend=prepend)
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return ''.join((filename, '.', ext, real_ext))
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# Mitigate path traversal and file impersonation attacks
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return '.'.join((filename, sanitize_extension(ext)))
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def replace_extension(filename, ext, expected_real_ext=None):
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name, real_ext = os.path.splitext(filename)
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return '{0}.{1}'.format(
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name if not expected_real_ext or real_ext[1:] == expected_real_ext else filename,
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ext)
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prepend_extension = functools.partial(_change_extension, True)
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replace_extension = functools.partial(_change_extension, False)
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def check_executable(exe, args=[]):
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@ -6579,3 +6549,136 @@ def join_nonempty(*values, **kwargs):
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if from_dict is not None:
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values = (traverse_obj(from_dict, variadic(v)) for v in values)
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return delim.join(map(compat_str, filter(None, values)))
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class Namespace(object):
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"""Immutable namespace"""
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def __init__(self, **kw_attr):
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self.__dict__.update(kw_attr)
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def __iter__(self):
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return iter(self.__dict__.values())
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@property
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def items_(self):
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return self.__dict__.items()
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MEDIA_EXTENSIONS = Namespace(
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common_video=('avi', 'flv', 'mkv', 'mov', 'mp4', 'webm'),
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video=('3g2', '3gp', 'f4v', 'mk3d', 'divx', 'mpg', 'ogv', 'm4v', 'wmv'),
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common_audio=('aiff', 'alac', 'flac', 'm4a', 'mka', 'mp3', 'ogg', 'opus', 'wav'),
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audio=('aac', 'ape', 'asf', 'f4a', 'f4b', 'm4b', 'm4p', 'm4r', 'oga', 'ogx', 'spx', 'vorbis', 'wma', 'weba'),
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thumbnails=('jpg', 'png', 'webp'),
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# storyboards=('mhtml', ),
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subtitles=('srt', 'vtt', 'ass', 'lrc', 'ttml'),
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manifests=('f4f', 'f4m', 'm3u8', 'smil', 'mpd'),
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)
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MEDIA_EXTENSIONS.video = MEDIA_EXTENSIONS.common_video + MEDIA_EXTENSIONS.video
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MEDIA_EXTENSIONS.audio = MEDIA_EXTENSIONS.common_audio + MEDIA_EXTENSIONS.audio
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KNOWN_EXTENSIONS = (
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MEDIA_EXTENSIONS.video + MEDIA_EXTENSIONS.audio
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+ MEDIA_EXTENSIONS.manifests
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)
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class _UnsafeExtensionError(Exception):
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"""
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Mitigation exception for unwanted file overwrite/path traversal
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This should be caught in YoutubeDL.py with a warning
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Ref: https://github.com/yt-dlp/yt-dlp/security/advisories/GHSA-79w7-vh3h-8g4j
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"""
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_ALLOWED_EXTENSIONS = frozenset(itertools.chain(
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( # internal
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'description',
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'json',
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'meta',
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'orig',
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'part',
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'temp',
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'uncut',
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'unknown_video',
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'ytdl',
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),
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# video
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MEDIA_EXTENSIONS.video, (
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'avif',
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'ismv',
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'm2ts',
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'm4s',
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'mng',
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'mpeg',
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'qt',
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'swf',
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'ts',
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'vp9',
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'wvm',
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),
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# audio
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MEDIA_EXTENSIONS.audio, (
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'isma',
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'mid',
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'mpga',
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'ra',
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),
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# image
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MEDIA_EXTENSIONS.thumbnails, (
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'bmp',
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'gif',
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'ico',
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'heic',
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'jng',
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'jpeg',
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'jxl',
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'svg',
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'tif',
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'wbmp',
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),
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# subtitle
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MEDIA_EXTENSIONS.subtitles, (
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'dfxp',
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'fs',
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'ismt',
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'sami',
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'scc',
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'ssa',
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'tt',
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),
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# others
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MEDIA_EXTENSIONS.manifests,
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(
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# not used in yt-dl
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# *MEDIA_EXTENSIONS.storyboards,
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# 'desktop',
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# 'ism',
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# 'm3u',
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# 'sbv',
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# 'swp',
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# 'url',
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# 'webloc',
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# 'xml',
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)))
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def __init__(self, extension):
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super(_UnsafeExtensionError, self).__init__('unsafe file extension: {0!r}'.format(extension))
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self.extension = extension
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@classmethod
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def sanitize_extension(cls, extension, **kwargs):
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# ... /, *, prepend=False
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prepend = kwargs.get('prepend', False)
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if '/' in extension or '\\' in extension:
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raise cls(extension)
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if not prepend:
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last = extension.rpartition('.')[-1]
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if last == 'bin':
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extension = last = 'unknown_video'
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if last.lower() not in cls._ALLOWED_EXTENSIONS:
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raise cls(extension)
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return extension
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