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 create_symlink(self, conn, target, symlink):
  59         self.clean_file(conn, symlink)
  60         if (conn.protocol() < libsmb.PROTOCOL_SMB2_02 and conn.have_posix()):
  61             conn.smb1_symlink(target, symlink)
  62         else:
  63             flags = 0 if target[0]=='/' else 1
  64             syml = conn.create(
  65                 symlink,
  66                 DesiredAccess=sec.SEC_FILE_READ_ATTRIBUTE|
  67                 sec.SEC_FILE_WRITE_ATTRIBUTE|
  68                 sec.SEC_STD_DELETE,
  69                 FileAttributes=libsmb.FILE_ATTRIBUTE_NORMAL,
  70                 CreateDisposition=libsmb.FILE_OPEN_IF,
  71                 CreateOptions=libsmb.FILE_OPEN_REPARSE_POINT)
  72             b = reparse_symlink.symlink_put(target, target, 0, 1)
  73             conn.fsctl(syml, libsmb.FSCTL_SET_REPARSE_POINT, b, 0)
  74             conn.close(syml)
  75
  76     def assert_symlink_exception(self, e, expect):
  77         self.assertEqual(e.args[0], ntstatus.NT_STATUS_STOPPED_ON_SYMLINK)
  78         for k,v in expect.items():
  79             if (k == "flags"):
  80                 # Ignore symlink trust flags for now
  81                 expected = v & ~libsmb.SYMLINK_TRUST_MASK
  82                 got = e.args[2].get(k) & ~libsmb.SYMLINK_TRUST_MASK
  83                 self.assertEqual((k,got), (k,expected))
  84             else:
  85                 self.assertEqual((k,e.args[2].get(k)), (k,v))
  86
  87     def test_symlinkerror_directory(self):
  88         """Test a symlink in a nonterminal path component"""
  89         (smb1,smb2) = self.connections()
  90         symlink="syml"
  91         target="foo"
  92         suffix="bar"
  93
  94         self.create_symlink(smb1, target, symlink)
  95
  96         with self.assertRaises(NTSTATUSError) as e:
  97             fd = smb2.create_ex(f'{symlink}\\{suffix}')
  98
  99         self.assert_symlink_exception(
 100             e.exception,
 101             { 'unparsed_path_length' : len(suffix)+1,
 102               'substitute_name' : target,
 103               'print_name' : target,
 104               'flags' : 0x20000001 })
 105
 106         self.clean_file(smb1, symlink)
 107
 108     def test_symlinkerror_file(self):
 109         """Test a simple symlink in a terminal path"""
 110         (smb1,smb2) = self.connections()
 111         symlink="syml"
 112         target="foo"
 113
 114         self.create_symlink(smb1, target, symlink)
 115
 116         with self.assertRaises(NTSTATUSError) as e:
 117             fd = smb2.create_ex(f'{symlink}')
 118
 119         self.assert_symlink_exception(
 120                 e.exception,
 121             { 'unparsed_path_length' : 0,
 122               'substitute_name' : target,
 123               'print_name' : target,
 124               'flags' : 0x20000001 })
 125
 126         self.clean_file(smb1, symlink)
 127
 128     def test_symlinkerror_absolute_outside_share(self):
 129         """
 130         Test symlinks to outside of the share
 131         We return the contents 1:1
 132         """
 133         (smb1,smb2) = self.connections()
 134         symlink="syml"
 135
 136         for target in ["/etc", "//foo/bar", "/"]:
 137
 138             self.create_symlink(smb1, target, symlink)
 139
 140             with self.assertRaises(NTSTATUSError) as e:
 141                 fd = smb2.create_ex(f'{symlink}')
 142
 143             self.assert_symlink_exception(
 144                 e.exception,
 145                 { 'unparsed_path_length' : 0,
 146                   'substitute_name' : target,
 147                   'print_name' : target,
 148                   'flags' : 0 })
 149
 150             self.clean_file(smb1, symlink)
 151
 152     def test_symlinkerror_absolute_inshare(self):
 153         """Test an absolute symlink inside the share"""
 154         (smb1,smb2) = self.connections()
 155         symlink="syml"
 156
 157         localpath=samba.tests.env_get_var_value("LOCAL_PATH")
 158         shareroot=f'{localpath}/nosymlinks'
 159         rel_dest="dst"
 160         target=f'{shareroot}/{rel_dest}'
 161
 162         self.create_symlink(smb1, target, symlink)
 163
 164         with self.assertRaises(NTSTATUSError) as e:
 165             fd = smb2.create_ex(f'{symlink}')
 166
 167         self.assert_symlink_exception(
 168             e.exception,
 169             { 'unparsed_path_length' : 0,
 170               'substitute_name' : rel_dest,
 171               'print_name' : rel_dest,
 172               'flags' : 0 })
 173
 174         self.clean_file(smb1, symlink)
 175
 176     def test_symlink_reparse_data_buffer_parse(self):
 177         """Test parsing a symlink reparse buffer coming from Windows"""
 178
 179         buf = (b'\x0c\x00\x00\xa0\x18\x00\x00\x00'
 180                b'\x06\x00\x06\x00\x00\x00\x06\x00'
 181                b'\x01\x00\x00\x00\x62\x00\x61\x00'
 182                b'\x72\x00\x62\x00\x61\x00\x72\x00')
 183
 184         try:
 185             (tag,syml) = reparse_symlink.get(buf)
 186         except:
 187             self.fail("Could not parse symlink buffer")
 188
 189         self.assertEqual(tag, "IO_REPARSE_TAG_SYMLINK")
 190         self.assertEqual(syml, ('bar', 'bar', 0, 1))
 191
 192     def test_bug15505(self):
 193         """Test an absolute intermediate symlink inside the share"""
 194         (smb1,smb2) = self.connections(smb1share="tmp",smb2share="tmp")
 195         symlink="syml"
 196
 197         localpath=samba.tests.env_get_var_value("LOCAL_PATH")
 198
 199         smb1.mkdir("sub")
 200         self.addCleanup(self.clean_file, smb1, "sub")
 201
 202         self.create_symlink(smb1, f'{localpath}/sub1', "sub/lnk")
 203         self.addCleanup(self.clean_file, smb1, "sub/lnk")
 204
 205         smb1.mkdir("sub1")
 206         self.addCleanup(self.clean_file, smb1, "sub1")
 207
 208         fd = smb1.create("sub1/x", CreateDisposition=libsmb.FILE_CREATE);
 209         smb1.close(fd)
 210         self.addCleanup(self.clean_file, smb1, "sub1/x")
 211
 212         fd = smb2.create("sub\\lnk\\x")
 213         smb2.close(fd)
 214
 215 if __name__ == '__main__':
 216     import unittest
 217     unittest.main()