python/samba/tests/smb2symlink.py

   1 # Unix SMB/CIFS implementation.
   2 # Copyright Volker Lendecke <vl@samba.org> 2022
   3 #
   4 # This program is free software; you can redistribute it and/or modify
   5 # it under the terms of the GNU General Public License as published by
   6 # the Free Software Foundation; either version 3 of the License, or
   7 # (at your option) any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 #
  17
  18 from samba.samba3 import libsmb_samba_internal as libsmb
  19 from samba import reparse_symlink
  20 from samba import (ntstatus,NTSTATUSError)
  21 from samba.dcerpc import security as sec
  22 import samba.tests.libsmb
  23
  24 class Smb2SymlinkTests(samba.tests.libsmb.LibsmbTests):
  25
  26     def connections(self, smb1share=None, smb2share=None):
  27         if not smb1share:
  28             smb1share = samba.tests.env_get_var_value(
  29                 "SMB1_SHARE", allow_missing=True)
  30             if not smb1share:
  31                 smb1share = "nosymlinks_smb1allow"
  32
  33         try:
  34             smb1 = libsmb.Conn(
  35                 self.server_ip,
  36                 smb1share,
  37                 self.lp,
  38                 self.creds,
  39                 force_smb1=True)
  40         except NTSTATUSError as e:
  41             if e.args[0] != ntstatus.NT_STATUS_CONNECTION_RESET:
  42                 raise
  43         smb1.smb1_posix()
  44
  45         if not smb2share:
  46             smb2share = samba.tests.env_get_var_value(
  47                 "SMB2_SHARE", allow_missing=True)
  48             if not smb2share:
  49                 smb2share = "nosymlinks"
  50
  51         smb2 = libsmb.Conn(
  52             self.server_ip,
  53             smb2share,
  54             self.lp,
  55             self.creds)
  56         return (smb1, smb2)
  57
  58     def clean_file(self, conn, filename):
  59         try:
  60             conn.unlink(filename)
  61         except NTSTATUSError as e:
  62             if e.args[0] == ntstatus.NT_STATUS_FILE_IS_A_DIRECTORY:
  63                 conn.rmdir(filename)
  64             elif not (e.args[0] == ntstatus.NT_STATUS_OBJECT_NAME_NOT_FOUND or
  65                       e.args[0] == ntstatus.NT_STATUS_OBJECT_PATH_NOT_FOUND):
  66                 raise
  67
  68     def create_symlink(self, conn, target, symlink):
  69         self.clean_file(conn, symlink)
  70         if (conn.protocol() < libsmb.PROTOCOL_SMB2_02 and conn.have_posix()):
  71             conn.smb1_symlink(target, symlink)
  72         else:
  73             flags = 0 if target[0]=='/' else 1
  74             syml = conn.create(
  75                 symlink,
  76                 DesiredAccess=sec.SEC_FILE_READ_ATTRIBUTE|
  77                 sec.SEC_FILE_WRITE_ATTRIBUTE|
  78                 sec.SEC_STD_DELETE,
  79                 FileAttributes=libsmb.FILE_ATTRIBUTE_NORMAL,
  80                 CreateDisposition=libsmb.FILE_OPEN_IF,
  81                 CreateOptions=libsmb.FILE_OPEN_REPARSE_POINT)
  82             b = reparse_symlink.symlink_put(target, target, 0, 1)
  83             conn.fsctl(syml, libsmb.FSCTL_SET_REPARSE_POINT, b, 0)
  84             conn.close(syml)
  85
  86     def assert_symlink_exception(self, e, expect):
  87         self.assertEqual(e.args[0], ntstatus.NT_STATUS_STOPPED_ON_SYMLINK)
  88         for k,v in expect.items():
  89             if (k == "flags"):
  90                 # Ignore symlink trust flags for now
  91                 expected = v & ~libsmb.SYMLINK_TRUST_MASK
  92                 got = e.args[2].get(k) & ~libsmb.SYMLINK_TRUST_MASK
  93                 self.assertEqual((k,got), (k,expected))
  94             else:
  95                 self.assertEqual((k,e.args[2].get(k)), (k,v))
  96
  97     def test_symlinkerror_directory(self):
  98         """Test a symlink in a nonterminal path component"""
  99         (smb1,smb2) = self.connections()
 100         symlink="syml"
 101         target="foo"
 102         suffix="bar"
 103
 104         self.create_symlink(smb1, target, symlink)
 105
 106         with self.assertRaises(NTSTATUSError) as e:
 107             fd = smb2.create_ex(f'{symlink}\\{suffix}')
 108
 109         self.assert_symlink_exception(
 110             e.exception,
 111             { 'unparsed_path_length' : len(suffix)+1,
 112               'substitute_name' : target,
 113               'print_name' : target,
 114               'flags' : 0x20000001 })
 115
 116         self.clean_file(smb1, symlink)
 117
 118     def test_symlinkerror_file(self):
 119         """Test a simple symlink in a terminal path"""
 120         (smb1,smb2) = self.connections()
 121         symlink="syml"
 122         target="foo"
 123
 124         self.create_symlink(smb1, target, symlink)
 125
 126         with self.assertRaises(NTSTATUSError) as e:
 127             fd = smb2.create_ex(f'{symlink}')
 128
 129         self.assert_symlink_exception(
 130                 e.exception,
 131             { 'unparsed_path_length' : 0,
 132               'substitute_name' : target,
 133               'print_name' : target,
 134               'flags' : 0x20000001 })
 135
 136         self.clean_file(smb1, symlink)
 137
 138     def test_symlinkerror_absolute_outside_share(self):
 139         """
 140         Test symlinks to outside of the share
 141         We return the contents 1:1
 142         """
 143         (smb1,smb2) = self.connections()
 144         symlink="syml"
 145
 146         for target in ["/etc", "//foo/bar", "/"]:
 147
 148             self.create_symlink(smb1, target, symlink)
 149
 150             with self.assertRaises(NTSTATUSError) as e:
 151                 fd = smb2.create_ex(f'{symlink}')
 152
 153             self.assert_symlink_exception(
 154                 e.exception,
 155                 { 'unparsed_path_length' : 0,
 156                   'substitute_name' : target,
 157                   'print_name' : target,
 158                   'flags' : 0 })
 159
 160             self.clean_file(smb1, symlink)
 161
 162     def test_symlinkerror_absolute_inshare(self):
 163         """Test an absolute symlink inside the share"""
 164         (smb1,smb2) = self.connections()
 165         symlink="syml"
 166
 167         localpath=samba.tests.env_get_var_value("LOCAL_PATH")
 168         shareroot=f'{localpath}/nosymlinks'
 169         rel_dest="dst"
 170         target=f'{shareroot}/{rel_dest}'
 171
 172         self.create_symlink(smb1, target, symlink)
 173
 174         with self.assertRaises(NTSTATUSError) as e:
 175             fd = smb2.create_ex(f'{symlink}')
 176
 177         self.assert_symlink_exception(
 178             e.exception,
 179             { 'unparsed_path_length' : 0,
 180               'substitute_name' : rel_dest,
 181               'print_name' : rel_dest,
 182               'flags' : 0 })
 183
 184         self.clean_file(smb1, symlink)
 185
 186     def test_symlink_reparse_data_buffer_parse(self):
 187         """Test parsing a symlink reparse buffer coming from Windows"""
 188
 189         buf = (b'\x0c\x00\x00\xa0\x18\x00\x00\x00'
 190                b'\x06\x00\x06\x00\x00\x00\x06\x00'
 191                b'\x01\x00\x00\x00\x62\x00\x61\x00'
 192                b'\x72\x00\x62\x00\x61\x00\x72\x00')
 193
 194         try:
 195             syml = reparse_symlink.symlink_get(buf);
 196         except:
 197             self.fail("Could not parse symlink buffer")
 198
 199         self.assertEqual(syml, ('bar', 'bar', 0, 1));
 200
 201     def test_bug15505(self):
 202         """Test an absolute intermediate symlink inside the share"""
 203         (smb1,smb2) = self.connections(smb1share="tmp",smb2share="tmp")
 204         symlink="syml"
 205
 206         localpath=samba.tests.env_get_var_value("LOCAL_PATH")
 207
 208         smb1.mkdir("sub")
 209         self.addCleanup(self.clean_file, smb1, "sub")
 210
 211         self.create_symlink(smb1, f'{localpath}/sub1', "sub/lnk")
 212         self.addCleanup(self.clean_file, smb1, "sub/lnk")
 213
 214         smb1.mkdir("sub1")
 215         self.addCleanup(self.clean_file, smb1, "sub1")
 216
 217         fd = smb1.create("sub1/x", CreateDisposition=libsmb.FILE_CREATE);
 218         smb1.close(fd)
 219         self.addCleanup(self.clean_file, smb1, "sub1/x")
 220
 221         fd = smb2.create("sub\\lnk\\x")
 222         smb2.close(fd)
 223
 224 if __name__ == '__main__':
 225     import unittest
 226     unittest.main()