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 #undef DBGC_CLASS
  30 #define DBGC_CLASS DBGC_SMB2
  31
  32 static NTSTATUS fsctl_dfs_get_refers(TALLOC_CTX *mem_ctx,
  33                                      struct tevent_context *ev,
  34                                      struct connection_struct *conn,
  35                                      DATA_BLOB *in_input,
  36                                      uint32_t in_max_output,
  37                                      DATA_BLOB *out_output)
  38 {
  39         uint16_t in_max_referral_level;
  40         DATA_BLOB in_file_name_buffer;
  41         char *in_file_name_string;
  42         size_t in_file_name_string_size;
  43         bool ok;
  44         bool overflow = false;
  45         NTSTATUS status;
  46         int dfs_size;
  47         char *dfs_data = NULL;
  48         DATA_BLOB output;
  49
  50         if (!lp_host_msdfs()) {
  51                 return NT_STATUS_FS_DRIVER_REQUIRED;
  52         }
  53
  54         if (in_input->length < (2 + 2)) {
  55                 return NT_STATUS_INVALID_PARAMETER;
  56         }
  57
  58         in_max_referral_level = SVAL(in_input->data, 0);
  59         in_file_name_buffer.data = in_input->data + 2;
  60         in_file_name_buffer.length = in_input->length - 2;
  61
  62         ok = convert_string_talloc(mem_ctx, CH_UTF16, CH_UNIX,
  63                                    in_file_name_buffer.data,
  64                                    in_file_name_buffer.length,
  65                                    &in_file_name_string,
  66                                    &in_file_name_string_size);
  67         if (!ok) {
  68                 return NT_STATUS_ILLEGAL_CHARACTER;
  69         }
  70
  71         dfs_size = setup_dfs_referral(conn,
  72                                       in_file_name_string,
  73                                       in_max_referral_level,
  74                                       &dfs_data, &status);
  75         if (dfs_size < 0) {
  76                 return status;
  77         }
  78
  79         if (dfs_size > in_max_output) {
  80                 /*
  81                  * TODO: we need a testsuite for this
  82                  */
  83                 overflow = true;
  84                 dfs_size = in_max_output;
  85         }
  86
  87         output = data_blob_talloc(mem_ctx, (uint8_t *)dfs_data, dfs_size);
  88         SAFE_FREE(dfs_data);
  89         if ((dfs_size > 0) && (output.data == NULL)) {
  90                 return NT_STATUS_NO_MEMORY;
  91         }
  92         *out_output = output;
  93
  94         if (overflow) {
  95                 return STATUS_BUFFER_OVERFLOW;
  96         }
  97         return NT_STATUS_OK;
  98 }
  99
 100 struct tevent_req *smb2_ioctl_dfs(uint32_t ctl_code,
 101                                   struct tevent_context *ev,
 102                                   struct tevent_req *req,
 103                                   struct smbd_smb2_ioctl_state *state)
 104 {
 105         NTSTATUS status;
 106
 107         switch (ctl_code) {
 108         case FSCTL_DFS_GET_REFERRALS:
 109                 status = fsctl_dfs_get_refers(state, ev, state->smbreq->conn,
 110                                               &state->in_input,
 111                                               state->in_max_output,
 112                                               &state->out_output);
 113                 if (!tevent_req_nterror(req, status)) {
 114                         tevent_req_done(req);
 115                 }
 116                 return tevent_req_post(req, ev);
 117                 break;
 118         default: {
 119                 uint8_t *out_data = NULL;
 120                 uint32_t out_data_len = 0;
 121
 122                 if (state->fsp == NULL) {
 123                         status = NT_STATUS_NOT_SUPPORTED;
 124                 } else {
 125                         status = SMB_VFS_FSCTL(state->fsp,
 126                                                state,
 127                                                ctl_code,
 128                                                state->smbreq->flags2,
 129                                                state->in_input.data,
 130                                                state->in_input.length,
 131                                                &out_data,
 132                                                state->in_max_output,
 133                                                &out_data_len);
 134                         state->out_output = data_blob_const(out_data, out_data_len);
 135                         if (NT_STATUS_IS_OK(status)) {
 136                                 tevent_req_done(req);
 137                                 return tevent_req_post(req, ev);
 138                         }
 139                 }
 140
 141                 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED)) {
 142                         if (IS_IPC(state->smbreq->conn)) {
 143                                 status = NT_STATUS_FS_DRIVER_REQUIRED;
 144                         } else {
 145                                 status = NT_STATUS_INVALID_DEVICE_REQUEST;
 146                         }
 147                 }
 148
 149                 tevent_req_nterror(req, status);
 150                 return tevent_req_post(req, ev);
 151                 break;
 152         }
 153         }
 154
 155         tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 156         return tevent_req_post(req, ev);
 157 }