security-and-privacy/mat2
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Add support for compressed tar files

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This commit is contained in:
jvoisin 2019-04-27 06:03:09 -07:00
parent 82cc822a1d
commit 8e41b098d6
4 changed files with 149 additions and 3 deletions
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5
libmat2/abstract.py
View File

@ -25,6 +25,11 @@ class AbstractParser(abc.ABC):
self.filename = filename
fname, extension = os.path.splitext(filename)
# Special case for tar.gz, tar.bz2, … files
if fname.endswith('.tar') and len(fname) > 4:
fname, extension = fname[:-4], '.tar' + extension
self.output_filename = fname + '.cleaned' + extension
self.lightweight_cleaning = False

28
libmat2/archive.py
View File

@ -40,6 +40,10 @@ class ArchiveBasedAbstractParser(abstract.AbstractParser):
the Union[A, B] constrain, hence the weird `# type: ignore`
annotations.
"""
# Tarfiles can optionally support compression
# https://docs.python.org/3/library/tarfile.html#tarfile.open
compression = ''
def __init__(self, filename):
super().__init__(filename)
self.archive_class = None # type: Optional[ArchiveClass]
@ -134,7 +138,7 @@ class ArchiveBasedAbstractParser(abstract.AbstractParser):
# pylint: disable=too-many-branches
with self.archive_class(self.filename) as zin,\
self.archive_class(self.output_filename, 'w') as zout:
self.archive_class(self.output_filename, 'w' + self.compression) as zout:
temp_folder = tempfile.mkdtemp()
abort = False
@ -212,7 +216,11 @@ class TarParser(ArchiveBasedAbstractParser):
mimetypes = {'application/x-tar'}
def __init__(self, filename):
super().__init__(filename)
self.archive_class = tarfile.TarFile
# yes, it's tarfile.TarFile.open and not tarfile.TarFile,
# as stated in the documentation:
# https://docs.python.org/3/library/tarfile.html#tarfile.TarFile
# This is required to support compressed archives.
self.archive_class = tarfile.TarFile.open
self.member_class = tarfile.TarInfo
def is_archive_valid(self):
@ -259,6 +267,22 @@ class TarParser(ArchiveBasedAbstractParser):
assert isinstance(member, tarfile.TarInfo) # please mypy
return member.name
class TarGzParser(TarParser):
compression = ':gz'
mimetypes = {'application/x-tar+gz'}
class TarBz2Parser(TarParser):
compression = ':bz2'
mimetypes = {'application/x-tar+bz2'}
class TarXzParser(TarParser):
compression = ':xz'
mimetypes = {'application/x-tar+xz'}
class ZipParser(ArchiveBasedAbstractParser):
mimetypes = {'application/zip'}
def __init__(self, filename):

4
libmat2/parser_factory.py
View File

@ -50,6 +50,10 @@ def get_parser(filename: str) -> Tuple[Optional[T], Optional[str]]:
if extension.lower() in UNSUPPORTED_EXTENSIONS:
return None, mtype
if mtype == 'application/x-tar':
if extension[1:] in ('bz2', 'gz', 'xz'):
mtype = mtype + '+' + extension[1:]
for parser_class in _get_parsers(): # type: ignore
if mtype in parser_class.mimetypes:
try:

115
tests/test_libmat2.py
View File

@ -30,6 +30,14 @@ class TestParserFactory(unittest.TestCase):
self.assertEqual(mimetype, 'audio/mpeg')
self.assertEqual(parser.__class__, audio.MP3Parser)
def test_tarfile_double_extension_handling(self):
""" Test that our module auto-detection is handling sub-sub-classes """
with tarfile.TarFile.open('./tests/data/dirty.tar.bz2', 'w:bz2') as zout:
zout.add('./tests/data/dirty.jpg')
parser, mimetype = parser_factory.get_parser('./tests/data/dirty.tar.bz2')
self.assertEqual(mimetype, 'application/x-tar+bz2')
os.remove('./tests/data/dirty.tar.bz2')
class TestParameterInjection(unittest.TestCase):
def test_ver_injection(self):
@ -719,7 +727,7 @@ class TestCleaning(unittest.TestCase):
os.remove('./tests/data/clean.cleaned.cleaned.css')
def test_tar(self):
with tarfile.TarFile('./tests/data/dirty.tar', 'w') as zout:
with tarfile.TarFile.open('./tests/data/dirty.tar', 'w') as zout:
zout.add('./tests/data/dirty.flac')
zout.add('./tests/data/dirty.docx')
zout.add('./tests/data/dirty.jpg')
@ -752,3 +760,108 @@ class TestCleaning(unittest.TestCase):
os.remove('./tests/data/dirty.tar')
os.remove('./tests/data/dirty.cleaned.tar')
os.remove('./tests/data/dirty.cleaned.cleaned.tar')
def test_targz(self):
with tarfile.TarFile.open('./tests/data/dirty.tar.gz', 'w:gz') as zout:
zout.add('./tests/data/dirty.flac')
zout.add('./tests/data/dirty.docx')
zout.add('./tests/data/dirty.jpg')
p = archive.TarParser('./tests/data/dirty.tar.gz')
meta = p.get_meta()
self.assertEqual(meta['./tests/data/dirty.docx']['word/media/image1.png']['Comment'], 'This is a comment, be careful!')
ret = p.remove_all()
self.assertTrue(ret)
p = archive.TarParser('./tests/data/dirty.cleaned.tar.gz')
self.assertEqual(p.get_meta(), {})
self.assertTrue(p.remove_all())
tmp_dir = tempfile.mkdtemp()
with tarfile.open('./tests/data/dirty.cleaned.tar.gz') as zout:
zout.extractall(path=tmp_dir)
zout.close()
number_of_files = 0
for root, _, fnames in os.walk(tmp_dir):
for f in fnames:
complete_path = os.path.join(root, f)
p, _ = parser_factory.get_parser(complete_path)
self.assertIsNotNone(p)
self.assertEqual(p.get_meta(), {})
number_of_files += 1
self.assertEqual(number_of_files, 3)
os.remove('./tests/data/dirty.tar.gz')
os.remove('./tests/data/dirty.cleaned.tar.gz')
os.remove('./tests/data/dirty.cleaned.cleaned.tar.gz')
def test_tarbz2(self):
with tarfile.TarFile.open('./tests/data/dirty.tar.bz2', 'w:bz2') as zout:
zout.add('./tests/data/dirty.flac')
zout.add('./tests/data/dirty.docx')
zout.add('./tests/data/dirty.jpg')
p = archive.TarParser('./tests/data/dirty.tar.bz2')
meta = p.get_meta()
self.assertEqual(meta['./tests/data/dirty.docx']['word/media/image1.png']['Comment'], 'This is a comment, be careful!')
ret = p.remove_all()
self.assertTrue(ret)
p = archive.TarParser('./tests/data/dirty.cleaned.tar.bz2')
self.assertEqual(p.get_meta(), {})
self.assertTrue(p.remove_all())
tmp_dir = tempfile.mkdtemp()
with tarfile.open('./tests/data/dirty.cleaned.tar.bz2') as zout:
zout.extractall(path=tmp_dir)
zout.close()
number_of_files = 0
for root, _, fnames in os.walk(tmp_dir):
for f in fnames:
complete_path = os.path.join(root, f)
p, _ = parser_factory.get_parser(complete_path)
self.assertIsNotNone(p)
self.assertEqual(p.get_meta(), {})
number_of_files += 1
self.assertEqual(number_of_files, 3)
os.remove('./tests/data/dirty.tar.bz2')
os.remove('./tests/data/dirty.cleaned.tar.bz2')
os.remove('./tests/data/dirty.cleaned.cleaned.tar.bz2')
def test_tarxz(self):
with tarfile.TarFile.open('./tests/data/dirty.tar.xz', 'w:xz') as zout:
zout.add('./tests/data/dirty.flac')
zout.add('./tests/data/dirty.docx')
zout.add('./tests/data/dirty.jpg')
p = archive.TarParser('./tests/data/dirty.tar.xz')
meta = p.get_meta()
self.assertEqual(meta['./tests/data/dirty.docx']['word/media/image1.png']['Comment'], 'This is a comment, be careful!')
ret = p.remove_all()
self.assertTrue(ret)
p = archive.TarParser('./tests/data/dirty.cleaned.tar.xz')
self.assertEqual(p.get_meta(), {})
self.assertTrue(p.remove_all())
tmp_dir = tempfile.mkdtemp()
with tarfile.open('./tests/data/dirty.cleaned.tar.xz') as zout:
zout.extractall(path=tmp_dir)
zout.close()
number_of_files = 0
for root, _, fnames in os.walk(tmp_dir):
for f in fnames:
complete_path = os.path.join(root, f)
p, _ = parser_factory.get_parser(complete_path)
self.assertIsNotNone(p)
self.assertEqual(p.get_meta(), {})
number_of_files += 1
self.assertEqual(number_of_files, 3)
os.remove('./tests/data/dirty.tar.xz')
os.remove('./tests/data/dirty.cleaned.tar.xz')
os.remove('./tests/data/dirty.cleaned.cleaned.tar.xz')