source3/smbd/smb2_ioctl_dfs.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Core SMB2 server
   4
   5    Copyright (C) Stefan Metzmacher 2009
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "smbd/smbd.h"
  23 #include "smbd/globals.h"
  24 #include "../libcli/smb/smb_common.h"
  25 #include "../lib/util/tevent_ntstatus.h"
  26 #include "include/ntioctl.h"
  27 #include "smb2_ioctl_private.h"
  28
  29 static NTSTATUS fsctl_dfs_get_refers(TALLOC_CTX *mem_ctx,
  30                                      struct tevent_context *ev,
  31                                      struct connection_struct *conn,
  32                                      DATA_BLOB *in_input,
  33                                      uint32_t in_max_output,
  34                                      DATA_BLOB *out_output)
  35 {
  36         uint16_t in_max_referral_level;
  37         DATA_BLOB in_file_name_buffer;
  38         char *in_file_name_string;
  39         size_t in_file_name_string_size;
  40         bool ok;
  41         bool overflow = false;
  42         NTSTATUS status;
  43         int dfs_size;
  44         char *dfs_data = NULL;
  45         DATA_BLOB output;
  46
  47         if (!lp_host_msdfs()) {
  48                 return NT_STATUS_FS_DRIVER_REQUIRED;
  49         }
  50
  51         if (in_input->length < (2 + 2)) {
  52                 return NT_STATUS_INVALID_PARAMETER;
  53         }
  54
  55         in_max_referral_level = SVAL(in_input->data, 0);
  56         in_file_name_buffer.data = in_input->data + 2;
  57         in_file_name_buffer.length = in_input->length - 2;
  58
  59         ok = convert_string_talloc(mem_ctx, CH_UTF16, CH_UNIX,
  60                                    in_file_name_buffer.data,
  61                                    in_file_name_buffer.length,
  62                                    &in_file_name_string,
  63                                    &in_file_name_string_size);
  64         if (!ok) {
  65                 return NT_STATUS_ILLEGAL_CHARACTER;
  66         }
  67
  68         dfs_size = setup_dfs_referral(conn,
  69                                       in_file_name_string,
  70                                       in_max_referral_level,
  71                                       &dfs_data, &status);
  72         if (dfs_size < 0) {
  73                 return status;
  74         }
  75
  76         if (dfs_size > in_max_output) {
  77                 /*
  78                  * TODO: we need a testsuite for this
  79                  */
  80                 overflow = true;
  81                 dfs_size = in_max_output;
  82         }
  83
  84         output = data_blob_talloc(mem_ctx, (uint8_t *)dfs_data, dfs_size);
  85         SAFE_FREE(dfs_data);
  86         if ((dfs_size > 0) && (output.data == NULL)) {
  87                 return NT_STATUS_NO_MEMORY;
  88         }
  89         *out_output = output;
  90
  91         if (overflow) {
  92                 return STATUS_BUFFER_OVERFLOW;
  93         }
  94         return NT_STATUS_OK;
  95 }
  96
  97 struct tevent_req *smb2_ioctl_dfs(uint32_t ctl_code,
  98                                   struct tevent_context *ev,
  99                                   struct tevent_req *req,
 100                                   struct smbd_smb2_ioctl_state *state)
 101 {
 102         NTSTATUS status;
 103
 104         switch (ctl_code) {
 105         case FSCTL_DFS_GET_REFERRALS:
 106                 status = fsctl_dfs_get_refers(state, ev, state->smbreq->conn,
 107                                               &state->in_input,
 108                                               state->in_max_output,
 109                                               &state->out_output);
 110                 if (!tevent_req_nterror(req, status)) {
 111                         tevent_req_done(req);
 112                 }
 113                 return tevent_req_post(req, ev);
 114                 break;
 115         default: {
 116                 uint8_t *out_data = NULL;
 117                 uint32_t out_data_len = 0;
 118
 119                 if (state->fsp == NULL) {
 120                         status = NT_STATUS_NOT_SUPPORTED;
 121                 } else {
 122                         status = SMB_VFS_FSCTL(state->fsp,
 123                                                state,
 124                                                ctl_code,
 125                                                state->smbreq->flags2,
 126                                                state->in_input.data,
 127                                                state->in_input.length,
 128                                                &out_data,
 129                                                state->in_max_output,
 130                                                &out_data_len);
 131                         state->out_output = data_blob_const(out_data, out_data_len);
 132                         if (NT_STATUS_IS_OK(status)) {
 133                                 tevent_req_done(req);
 134                                 return tevent_req_post(req, ev);
 135                         }
 136                 }
 137
 138                 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED)) {
 139                         if (IS_IPC(state->smbreq->conn)) {
 140                                 status = NT_STATUS_FS_DRIVER_REQUIRED;
 141                         } else {
 142                                 status = NT_STATUS_INVALID_DEVICE_REQUEST;
 143                         }
 144                 }
 145
 146                 tevent_req_nterror(req, status);
 147                 return tevent_req_post(req, ev);
 148                 break;
 149         }
 150         }
 151
 152         tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 153         return tevent_req_post(req, ev);
 154 }