security-and-privacy/mat2
security-and-privacy/mat2
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Add a way to disable the sandbox

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Due to bubblewrap's pickiness, mat2 can now be run
without a sandbox, even if bubblewrap is installed.
This commit is contained in:
jvoisin 2019-10-12 16:13:49 -07:00
parent 3cef7fe7fc
commit 5f0b3beb46
7 changed files with 100 additions and 20 deletions
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1
libmat2/abstract.py
View File

@ -32,6 +32,7 @@ class AbstractParser(abc.ABC):
self.output_filename = fname + '.cleaned' + extension
self.lightweight_cleaning = False
self.sandbox = True
@abc.abstractmethod
def get_meta(self) -> Dict[str, Union[str, dict]]:

0
libmat2/subprocess.py → libmat2/bubblewrap.py
View File

14
libmat2/exiftool.py
View File

@ -2,10 +2,11 @@ import functools
import json
import logging
import os
import subprocess
from typing import Dict, Union, Set
from . import abstract
from . import subprocess
from . import bubblewrap
# Make pyflakes happy
assert Set
@ -19,9 +20,13 @@ class ExiftoolParser(abstract.AbstractParser):
meta_allowlist = set() # type: Set[str]
def get_meta(self) -> Dict[str, Union[str, dict]]:
out = subprocess.run([_get_exiftool_path(), '-json', self.filename],
if self.sandbox:
out = bubblewrap.run([_get_exiftool_path(), '-json', self.filename],
input_filename=self.filename,
check=True, stdout=subprocess.PIPE).stdout
else:
out = subprocess.run([_get_exiftool_path(), '-json', self.filename],
check=True, stdout=subprocess.PIPE).stdout
meta = json.loads(out.decode('utf-8'))[0]
for key in self.meta_allowlist:
meta.pop(key, None)
@ -48,9 +53,12 @@ class ExiftoolParser(abstract.AbstractParser):
'-o', self.output_filename,
self.filename]
try:
subprocess.run(cmd, check=True,
if self.sandbox:
bubblewrap.run(cmd, check=True,
input_filename=self.filename,
output_filename=self.output_filename)
else:
subprocess.run(cmd, check=True)
except subprocess.CalledProcessError as e: # pragma: no cover
logging.error("Something went wrong during the processing of %s: %s", self.filename, e)
return False

8
libmat2/video.py
View File

@ -1,3 +1,4 @@
import subprocess
import functools
import os
import logging
@ -5,7 +6,7 @@ import logging
from typing import Dict, Union
from . import exiftool
from . import subprocess
from . import bubblewrap
class AbstractFFmpegParser(exiftool.ExiftoolParser):
@ -33,9 +34,12 @@ class AbstractFFmpegParser(exiftool.ExiftoolParser):
'-flags:a', '+bitexact', # don't add any metadata
self.output_filename]
try:
subprocess.run(cmd, check=True,
if self.sandbox:
bubblewrap.run(cmd, check=True,
input_filename=self.filename,
output_filename=self.output_filename)
else:
subprocess.run(cmd, check=True)
except subprocess.CalledProcessError as e:
logging.error("Something went wrong during the processing of %s: %s", self.filename, e)
return False

14
mat2
View File

@ -55,6 +55,8 @@ def create_arg_parser() -> argparse.ArgumentParser:
', '.join(p.value for p in UnknownMemberPolicy))
parser.add_argument('--inplace', action='store_true',
help='clean in place, without backup')
parser.add_argument('--no-sandbox', dest='sandbox', action='store_true',
default=False, help='Disable bubblewrap\'s sandboxing.')
excl_group = parser.add_mutually_exclusive_group()
excl_group.add_argument('files', nargs='*', help='the files to process',
@ -78,7 +80,7 @@ def create_arg_parser() -> argparse.ArgumentParser:
return parser
def show_meta(filename: str):
def show_meta(filename: str, sandbox: bool):
if not __check_file(filename):
return
@ -86,6 +88,7 @@ def show_meta(filename: str):
if p is None:
print("[-] %s's format (%s) is not supported" % (filename, mtype))
return
p.sandbox = sandbox
__print_meta(filename, p.get_meta())
@ -116,7 +119,7 @@ def __print_meta(filename: str, metadata: dict, depth: int = 1):
print(padding + " %s: harmful content" % k)
def clean_meta(filename: str, is_lightweight: bool, inplace: bool,
def clean_meta(filename: str, is_lightweight: bool, inplace: bool, sandbox: bool,
policy: UnknownMemberPolicy) -> bool:
mode = (os.R_OK | os.W_OK) if inplace else os.R_OK
if not __check_file(filename, mode):
@ -128,6 +131,7 @@ def clean_meta(filename: str, is_lightweight: bool, inplace: bool,
return False
p.unknown_member_policy = policy
p.lightweight_cleaning = is_lightweight
p.sandbox = sandbox
try:
logging.debug('Cleaning %s…', filename)
@ -140,7 +144,6 @@ def clean_meta(filename: str, is_lightweight: bool, inplace: bool,
return False
def show_parsers():
print('[+] Supported formats:')
formats = set() # Set[str]
@ -171,6 +174,7 @@ def __get_files_recursively(files: List[str]) -> List[str]:
ret.add(f)
return list(ret)
def main() -> int:
arg_parser = create_arg_parser()
args = arg_parser.parse_args()
@ -193,7 +197,7 @@ def main() -> int:
elif args.show:
for f in __get_files_recursively(args.files):
show_meta(f)
show_meta(f, args.sandbox)
return 0
else:
@ -210,7 +214,7 @@ def main() -> int:
futures = list()
for f in files:
future = executor.submit(clean_meta, f, args.lightweight,
inplace, policy)
inplace, args.sandbox, policy)
futures.append(future)
for future in concurrent.futures.as_completed(futures):
no_failure &= future.result()

31
tests/test_climat2.py
View File

@ -20,17 +20,17 @@ class TestHelp(unittest.TestCase):
def test_help(self):
proc = subprocess.Popen(mat2_binary + ['--help'], stdout=subprocess.PIPE)
stdout, _ = proc.communicate()
self.assertIn(b'mat2 [-h] [-V] [--unknown-members policy] [--inplace] [-v] [-l]',
self.assertIn(b'mat2 [-h] [-V] [--unknown-members policy] [--inplace] [--no-sandbox]',
stdout)
self.assertIn(b'[--check-dependencies] [-L | -s]', stdout)
self.assertIn(b' [-v] [-l] [--check-dependencies] [-L | -s]', stdout)
self.assertIn(b'[files [files ...]]', stdout)
def test_no_arg(self):
proc = subprocess.Popen(mat2_binary, stdout=subprocess.PIPE)
stdout, _ = proc.communicate()
self.assertIn(b'mat2 [-h] [-V] [--unknown-members policy] [--inplace] [-v] [-l]',
self.assertIn(b'mat2 [-h] [-V] [--unknown-members policy] [--inplace] [--no-sandbox]',
stdout)
self.assertIn(b'[--check-dependencies] [-L | -s]', stdout)
self.assertIn(b' [-v] [-l] [--check-dependencies] [-L | -s]', stdout)
self.assertIn(b'[files [files ...]]', stdout)
@ -40,12 +40,14 @@ class TestVersion(unittest.TestCase):
stdout, _ = proc.communicate()
self.assertTrue(stdout.startswith(b'MAT2 '))
class TestDependencies(unittest.TestCase):
def test_dependencies(self):
proc = subprocess.Popen(mat2_binary + ['--check-dependencies'], stdout=subprocess.PIPE)
stdout, _ = proc.communicate()
self.assertTrue(b'MAT2' in stdout)
class TestReturnValue(unittest.TestCase):
def test_nonzero(self):
ret = subprocess.call(mat2_binary + ['mat2'], stdout=subprocess.DEVNULL)
@ -112,6 +114,25 @@ class TestCleanMeta(unittest.TestCase):
os.remove('./tests/data/clean.jpg')
def test_jpg_nosandbox(self):
shutil.copy('./tests/data/dirty.jpg', './tests/data/clean.jpg')
proc = subprocess.Popen(mat2_binary + ['--show', '--no-sandbox', './tests/data/clean.jpg'],
stdout=subprocess.PIPE)
stdout, _ = proc.communicate()
self.assertIn(b'Comment: Created with GIMP', stdout)
proc = subprocess.Popen(mat2_binary + ['./tests/data/clean.jpg'],
stdout=subprocess.PIPE)
stdout, _ = proc.communicate()
proc = subprocess.Popen(mat2_binary + ['--show', './tests/data/clean.cleaned.jpg'],
stdout=subprocess.PIPE)
stdout, _ = proc.communicate()
self.assertNotIn(b'Comment: Created with GIMP', stdout)
os.remove('./tests/data/clean.jpg')
class TestIsSupported(unittest.TestCase):
def test_pdf(self):
@ -181,6 +202,7 @@ class TestGetMeta(unittest.TestCase):
self.assertIn(b'i am a : various comment', stdout)
self.assertIn(b'artist: jvoisin', stdout)
class TestControlCharInjection(unittest.TestCase):
def test_jpg(self):
proc = subprocess.Popen(mat2_binary + ['--show', './tests/data/control_chars.jpg'],
@ -242,6 +264,7 @@ class TestCommandLineParallel(unittest.TestCase):
os.remove(path)
os.remove('./tests/data/dirty_%d.docx' % i)
class TestInplaceCleaning(unittest.TestCase):
def test_cleaning(self):
shutil.copy('./tests/data/dirty.jpg', './tests/data/clean.jpg')

40
tests/test_libmat2.py
View File

@ -721,3 +721,43 @@ class TestCleaningArchives(unittest.TestCase):
os.remove('./tests/data/dirty.tar.xz')
os.remove('./tests/data/dirty.cleaned.tar.xz')
os.remove('./tests/data/dirty.cleaned.cleaned.tar.xz')
class TestNoSandbox(unittest.TestCase):
def test_avi_nosandbox(self):
shutil.copy('./tests/data/dirty.avi', './tests/data/clean.avi')
p = video.AVIParser('./tests/data/clean.avi')
p.sandbox = False
meta = p.get_meta()
self.assertEqual(meta['Software'], 'MEncoder SVN-r33148-4.0.1')
ret = p.remove_all()
self.assertTrue(ret)
p = video.AVIParser('./tests/data/clean.cleaned.avi')
self.assertEqual(p.get_meta(), {})
self.assertTrue(p.remove_all())
os.remove('./tests/data/clean.avi')
os.remove('./tests/data/clean.cleaned.avi')
os.remove('./tests/data/clean.cleaned.cleaned.avi')
def test_png_nosandbox(self):
shutil.copy('./tests/data/dirty.png', './tests/data/clean.png')
p = images.PNGParser('./tests/data/clean.png')
p.sandbox = False
p.lightweight_cleaning = True
meta = p.get_meta()
self.assertEqual(meta['Comment'], 'This is a comment, be careful!')
ret = p.remove_all()
self.assertTrue(ret)
p = images.PNGParser('./tests/data/clean.cleaned.png')
self.assertEqual(p.get_meta(), {})
self.assertTrue(p.remove_all())
os.remove('./tests/data/clean.png')
os.remove('./tests/data/clean.cleaned.png')
os.remove('./tests/data/clean.cleaned.cleaned.png')