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Python's tarfile module is not very careful about paths that step out of the target directory. We can be a bit better at little cost. This was reported in 2007[1], and has recently been publicised [2, for example]. We were informed of this bug in December 2021 by Luis Alberto López Alvar, but decided then that there were no circumstances under which this was a security concern. That is, if you can alter the backup files, you can already do worse things. But there is a case to guard against an administrator being tricked into trying to restore a file that isn't based on a real backup. [1] https://nvd.nist.gov/vuln/detail/CVE-2007-4559 [2] https://www.theregister.com/2022/09/22/python_vulnerability_tarfile/ BUG: https://bugzilla.samba.org/show_bug.cgi?id=15185 Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz> Reviewed-by: Andrew Bartlett <abartlet@samba.org> Autobuild-User(master): Andrew Bartlett <abartlet@samba.org> Autobuild-Date(master): Tue Oct 4 03:48:43 UTC 2022 on sn-devel-184
68 lines
2.0 KiB
Python
68 lines
2.0 KiB
Python
# Unix SMB/CIFS implementation.
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# Copyright (C) Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
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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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#
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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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#
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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 <http://www.gnu.org/licenses/>.
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import tarfile
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from samba import safe_tarfile
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import tempfile
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import os
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from samba.tests import TestCaseInTempDir
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def filterer(prefix):
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def f(info):
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info.name = prefix + info.name
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return info
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return f
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class SafeTarFileTestCase(TestCaseInTempDir):
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def test_dots(self):
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filename = os.path.join(self.tempdir, 'x')
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tarname = os.path.join(self.tempdir, 'tar.tar')
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f = open(filename, 'w')
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f.write('x')
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f.close()
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tf = tarfile.open(tarname, 'w')
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tf.add(filename, filter=filterer('../../'))
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tf.close()
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stf = safe_tarfile.open(tarname)
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self.assertRaises(tarfile.ExtractError,
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stf.extractall,
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tarname)
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self.rm_files('x', 'tar.tar')
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def test_slash(self):
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filename = os.path.join(self.tempdir, 'x')
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tarname = os.path.join(self.tempdir, 'tar.tar')
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f = open(filename, 'w')
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f.write('x')
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f.close()
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tf = tarfile.open(tarname, 'w')
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tf.add(filename, filter=filterer('/'))
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tf.close()
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stf = safe_tarfile.open(tarname)
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self.assertRaises(tarfile.ExtractError,
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stf.extractall,
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tarname)
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self.rm_files('x', 'tar.tar')
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