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# Unix SMB/CIFS implementation.
# Copyright Volker Lendecke <vl@samba.org> 2022
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
from samba.samba3 import libsmb_samba_internal as libsmb
from samba import reparse_symlink
from samba import (ntstatus,NTSTATUSError)
from samba.dcerpc import security as sec
import samba.tests.libsmb
class Smb2SymlinkTests(samba.tests.libsmb.LibsmbTests):
def connections(self, smb1share=None, smb2share=None):
if not smb1share:
smb1share = samba.tests.env_get_var_value(
"SMB1_SHARE", allow_missing=True)
if not smb1share:
smb1share = "nosymlinks_smb1allow"
try:
smb1 = libsmb.Conn(
self.server_ip,
smb1share,
self.lp,
self.creds,
force_smb1=True)
except NTSTATUSError as e:
if e.args[0] != ntstatus.NT_STATUS_CONNECTION_RESET:
raise
smb1.smb1_posix()
if not smb2share:
smb2share = samba.tests.env_get_var_value(
"SMB2_SHARE", allow_missing=True)
if not smb2share:
smb2share = "nosymlinks"
smb2 = libsmb.Conn(
self.server_ip,
smb2share,
self.lp,
self.creds)
return (smb1, smb2)
def create_symlink(self, conn, target, symlink):
self.clean_file(conn, symlink)
if (conn.protocol() < libsmb.PROTOCOL_SMB2_02 and conn.have_posix()):
conn.smb1_symlink(target, symlink)
else:
flags = 0 if target[0]=='/' else 1
syml = conn.create(
symlink,
DesiredAccess=sec.SEC_FILE_READ_ATTRIBUTE|
sec.SEC_FILE_WRITE_ATTRIBUTE|
sec.SEC_STD_DELETE,
FileAttributes=libsmb.FILE_ATTRIBUTE_NORMAL,
CreateDisposition=libsmb.FILE_OPEN_IF,
CreateOptions=libsmb.FILE_OPEN_REPARSE_POINT)
b = reparse_symlink.symlink_put(target, target, 0, 1)
conn.fsctl(syml, libsmb.FSCTL_SET_REPARSE_POINT, b, 0)
conn.close(syml)
def assert_symlink_exception(self, e, expect):
self.assertEqual(e.args[0], ntstatus.NT_STATUS_STOPPED_ON_SYMLINK)
for k,v in expect.items():
if (k == "flags"):
# Ignore symlink trust flags for now
expected = v & ~libsmb.SYMLINK_TRUST_MASK
got = e.args[2].get(k) & ~libsmb.SYMLINK_TRUST_MASK
self.assertEqual((k,got), (k,expected))
else:
self.assertEqual((k,e.args[2].get(k)), (k,v))
def test_symlinkerror_directory(self):
"""Test a symlink in a nonterminal path component"""
(smb1,smb2) = self.connections()
symlink="syml"
target="foo"
suffix="bar"
self.create_symlink(smb1, target, symlink)
with self.assertRaises(NTSTATUSError) as e:
fd = smb2.create_ex(f'{symlink}\\{suffix}')
self.assert_symlink_exception(
e.exception,
{ 'unparsed_path_length' : len(suffix)+1,
'substitute_name' : target,
'print_name' : target,
'flags' : 0x20000001 })
self.clean_file(smb1, symlink)
def test_symlinkerror_file(self):
"""Test a simple symlink in a terminal path"""
(smb1,smb2) = self.connections()
symlink="syml"
target="foo"
self.create_symlink(smb1, target, symlink)
with self.assertRaises(NTSTATUSError) as e:
fd = smb2.create_ex(f'{symlink}')
self.assert_symlink_exception(
e.exception,
{ 'unparsed_path_length' : 0,
'substitute_name' : target,
'print_name' : target,
'flags' : 0x20000001 })
self.clean_file(smb1, symlink)
def test_symlinkerror_absolute_outside_share(self):
"""
Test symlinks to outside of the share
We return the contents 1:1
"""
(smb1,smb2) = self.connections()
symlink="syml"
for target in ["/etc", "//foo/bar", "/"]:
self.create_symlink(smb1, target, symlink)
with self.assertRaises(NTSTATUSError) as e:
fd = smb2.create_ex(f'{symlink}')
self.assert_symlink_exception(
e.exception,
{ 'unparsed_path_length' : 0,
'substitute_name' : target,
'print_name' : target,
'flags' : 0 })
self.clean_file(smb1, symlink)
def test_symlinkerror_absolute_inshare(self):
"""Test an absolute symlink inside the share"""
(smb1,smb2) = self.connections()
symlink="syml"
localpath=samba.tests.env_get_var_value("LOCAL_PATH")
shareroot=f'{localpath}/nosymlinks'
rel_dest="dst"
target=f'{shareroot}/{rel_dest}'
self.create_symlink(smb1, target, symlink)
with self.assertRaises(NTSTATUSError) as e:
fd = smb2.create_ex(f'{symlink}')
self.assert_symlink_exception(
e.exception,
{ 'unparsed_path_length' : 0,
'substitute_name' : rel_dest,
'print_name' : rel_dest,
'flags' : 0 })
self.clean_file(smb1, symlink)
def test_symlink_reparse_data_buffer_parse(self):
"""Test parsing a symlink reparse buffer coming from Windows"""
buf = (b'\x0c\x00\x00\xa0\x18\x00\x00\x00'
b'\x06\x00\x06\x00\x00\x00\x06\x00'
b'\x01\x00\x00\x00\x62\x00\x61\x00'
b'\x72\x00\x62\x00\x61\x00\x72\x00')
try:
syml = reparse_symlink.symlink_get(buf);
except:
self.fail("Could not parse symlink buffer")
self.assertEqual(syml, ('bar', 'bar', 0, 1));
def test_bug15505(self):
"""Test an absolute intermediate symlink inside the share"""
(smb1,smb2) = self.connections(smb1share="tmp",smb2share="tmp")
symlink="syml"
localpath=samba.tests.env_get_var_value("LOCAL_PATH")
smb1.mkdir("sub")
self.addCleanup(self.clean_file, smb1, "sub")
self.create_symlink(smb1, f'{localpath}/sub1', "sub/lnk")
self.addCleanup(self.clean_file, smb1, "sub/lnk")
smb1.mkdir("sub1")
self.addCleanup(self.clean_file, smb1, "sub1")
fd = smb1.create("sub1/x", CreateDisposition=libsmb.FILE_CREATE);
smb1.close(fd)
self.addCleanup(self.clean_file, smb1, "sub1/x")
fd = smb2.create("sub\\lnk\\x")
smb2.close(fd)
if __name__ == '__main__':
import unittest
unittest.main()
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