79 lines
3.1 KiB
Diff
79 lines
3.1 KiB
Diff
Minimal patch for pip
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diff -rU3 pip-orig/src/pip/_internal/utils/unpacking.py pip/src/pip/_internal/utils/unpacking.py
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--- pip-orig/src/pip/_internal/utils/unpacking.py 2022-11-05 16:25:43.000000000 +0100
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+++ pip/src/pip/_internal/utils/unpacking.py 2023-08-08 13:17:47.705613554 +0200
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@@ -184,6 +184,13 @@
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raise InstallationError(
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message.format(filename, path, location)
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)
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+
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+ # Call the `data` filter for its side effect (raising exception)
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+ try:
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+ tarfile.data_filter(member.replace(name=fn), location)
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+ except tarfile.LinkOutsideDestinationError:
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+ pass
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+
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if member.isdir():
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ensure_dir(path)
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elif member.issym():
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Test from https://github.com/pypa/pip/pull/12214
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diff -rU3 pip-orig/tests/unit/test_utils_unpacking.py pip/tests/unit/test_utils_unpacking.py
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--- pip-orig/tests/unit/test_utils_unpacking.py 2022-11-05 16:25:43.000000000 +0100
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+++ pip/tests/unit/test_utils_unpacking.py 2023-08-08 13:17:35.151540108 +0200
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@@ -171,6 +171,23 @@
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test_tar = self.make_tar_file('test_tar.tar', files)
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untar_file(test_tar, self.tempdir)
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+ def test_unpack_tar_filter(self) -> None:
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+ """
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+ Test that the tarfile.data_filter is used to disallow dangerous
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+ behaviour (PEP-721)
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+ """
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+ test_tar = os.path.join(self.tempdir, "test_tar_filter.tar")
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+ with tarfile.open(test_tar, "w") as mytar:
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+ file_tarinfo = tarfile.TarInfo("bad-link")
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+ file_tarinfo.type = tarfile.SYMTYPE
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+ file_tarinfo.linkname = "../../../../pwn"
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+ mytar.addfile(file_tarinfo, io.BytesIO(b""))
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+ with pytest.raises(InstallationError) as e:
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+ untar_file(test_tar, self.tempdir)
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+
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+ assert "is outside the destination" in str(e.value)
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+
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+
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@pytest.mark.parametrize('args, expected', [
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# Test the second containing the first.
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Patch for vendored distlib from https://github.com/pypa/distlib/pull/201
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diff --git a/distlib/util.py b/distlib/util.py
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index e0622e4..4349d0b 100644
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--- a/src/pip/_vendor/distlib/util.py
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+++ b/src/pip/_vendor/distlib/util.py
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@@ -1249,6 +1249,19 @@ def check_path(path):
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for tarinfo in archive.getmembers():
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if not isinstance(tarinfo.name, text_type):
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tarinfo.name = tarinfo.name.decode('utf-8')
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+
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+ # Limit extraction of dangerous items, if this Python
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+ # allows it easily. If not, just trust the input.
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+ # See: https://docs.python.org/3/library/tarfile.html#extraction-filters
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+ def extraction_filter(member, path):
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+ """Run tarfile.tar_fillter, but raise the expected ValueError"""
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+ # This is only called if the current Python has tarfile filters
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+ try:
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+ return tarfile.tar_filter(member, path)
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+ except tarfile.FilterError as exc:
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+ raise ValueError(str(exc))
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+ archive.extraction_filter = extraction_filter
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+
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archive.extractall(dest_dir)
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finally:
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