source3/smbd/smb2_ioctl_filesys.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Core SMB2 server
   4
   5    Copyright (C) Stefan Metzmacher 2009
   6    Copyright (C) David Disseldorp 2013-2015
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "smbd/smbd.h"
  24 #include "smbd/globals.h"
  25 #include "../libcli/smb/smb_common.h"
  26 #include "../libcli/security/security.h"
  27 #include "../lib/util/tevent_ntstatus.h"
  28 #include "rpc_server/srv_pipe_hnd.h"
  29 #include "include/ntioctl.h"
  30 #include "../librpc/ndr/libndr.h"
  31 #include "librpc/gen_ndr/ndr_ioctl.h"
  32 #include "smb2_ioctl_private.h"
  33
  34 static NTSTATUS fsctl_get_cmprn(TALLOC_CTX *mem_ctx,
  35                                 struct tevent_context *ev,
  36                                 struct files_struct *fsp,
  37                                 size_t in_max_output,
  38                                 DATA_BLOB *out_output)
  39 {
  40         struct compression_state cmpr_state;
  41         enum ndr_err_code ndr_ret;
  42         DATA_BLOB output;
  43         NTSTATUS status;
  44
  45         if (fsp == NULL) {
  46                 return NT_STATUS_FILE_CLOSED;
  47         }
  48
  49         /* Windows doesn't check for SEC_FILE_READ_ATTRIBUTE permission here */
  50
  51         if ((fsp->conn->fs_capabilities & FILE_FILE_COMPRESSION) == 0) {
  52                 DEBUG(4, ("FS does not advertise compression support\n"));
  53                 return NT_STATUS_NOT_SUPPORTED;
  54         }
  55
  56         ZERO_STRUCT(cmpr_state);
  57         status = SMB_VFS_GET_COMPRESSION(fsp->conn,
  58                                          mem_ctx,
  59                                          fsp,
  60                                          NULL,
  61                                          &cmpr_state.format);
  62         if (!NT_STATUS_IS_OK(status)) {
  63                 return status;
  64         }
  65
  66         ndr_ret = ndr_push_struct_blob(&output, mem_ctx,
  67                                        &cmpr_state,
  68                         (ndr_push_flags_fn_t)ndr_push_compression_state);
  69         if (ndr_ret != NDR_ERR_SUCCESS) {
  70                 return NT_STATUS_INTERNAL_ERROR;
  71         }
  72
  73         if (in_max_output < output.length) {
  74                 DEBUG(1, ("max output %u too small for compression state %ld\n",
  75                       (unsigned int)in_max_output, (long int)output.length));
  76                 return NT_STATUS_INVALID_USER_BUFFER;
  77         }
  78         *out_output = output;
  79
  80         return NT_STATUS_OK;
  81 }
  82
  83 static NTSTATUS fsctl_set_cmprn(TALLOC_CTX *mem_ctx,
  84                                 struct tevent_context *ev,
  85                                 struct files_struct *fsp,
  86                                 DATA_BLOB *in_input)
  87 {
  88         struct compression_state cmpr_state;
  89         enum ndr_err_code ndr_ret;
  90         NTSTATUS status;
  91
  92         if (fsp == NULL) {
  93                 return NT_STATUS_FILE_CLOSED;
  94         }
  95
  96         /* WRITE_DATA permission is required, WRITE_ATTRIBUTES is not */
  97         status = check_access(fsp->conn, fsp, NULL,
  98                               FILE_WRITE_DATA);
  99         if (!NT_STATUS_IS_OK(status)) {
 100                 return status;
 101         }
 102
 103         if ((fsp->conn->fs_capabilities & FILE_FILE_COMPRESSION) == 0) {
 104                 DEBUG(4, ("FS does not advertise compression support\n"));
 105                 return NT_STATUS_NOT_SUPPORTED;
 106         }
 107
 108         ndr_ret = ndr_pull_struct_blob(in_input, mem_ctx, &cmpr_state,
 109                         (ndr_pull_flags_fn_t)ndr_pull_compression_state);
 110         if (ndr_ret != NDR_ERR_SUCCESS) {
 111                 DEBUG(0, ("failed to unmarshall set compression req\n"));
 112                 return NT_STATUS_INVALID_PARAMETER;
 113         }
 114
 115         status = SMB_VFS_SET_COMPRESSION(fsp->conn,
 116                                          mem_ctx,
 117                                          fsp,
 118                                          cmpr_state.format);
 119         if (!NT_STATUS_IS_OK(status)) {
 120                 return status;
 121         }
 122
 123         return NT_STATUS_OK;
 124 }
 125
 126 static NTSTATUS fsctl_zero_data(TALLOC_CTX *mem_ctx,
 127                                 struct tevent_context *ev,
 128                                 struct files_struct *fsp,
 129                                 DATA_BLOB *in_input)
 130 {
 131         struct file_zero_data_info zdata_info;
 132         enum ndr_err_code ndr_ret;
 133         struct lock_struct lck;
 134         int mode;
 135         uint64_t len;
 136         int ret;
 137         NTSTATUS status;
 138
 139         if (fsp == NULL) {
 140                 return NT_STATUS_FILE_CLOSED;
 141         }
 142
 143         /* WRITE_DATA permission is required */
 144         status = check_access(fsp->conn, fsp, NULL, FILE_WRITE_DATA);
 145         if (!NT_STATUS_IS_OK(status)) {
 146                 return status;
 147         }
 148
 149         /* allow regardless of whether FS supports sparse or not */
 150
 151         ndr_ret = ndr_pull_struct_blob(in_input, mem_ctx, &zdata_info,
 152                         (ndr_pull_flags_fn_t)ndr_pull_file_zero_data_info);
 153         if (ndr_ret != NDR_ERR_SUCCESS) {
 154                 DEBUG(0, ("failed to unmarshall zero data request\n"));
 155                 return NT_STATUS_INVALID_PARAMETER;
 156         }
 157
 158         if (zdata_info.beyond_final_zero < zdata_info.file_off) {
 159                 DEBUG(0, ("invalid zero data params: off %lu, bfz, %lu\n",
 160                           (unsigned long)zdata_info.file_off,
 161                           (unsigned long)zdata_info.beyond_final_zero));
 162                 return NT_STATUS_INVALID_PARAMETER;
 163         }
 164
 165         /* convert strange "beyond final zero" param into length */
 166         len = zdata_info.beyond_final_zero - zdata_info.file_off;
 167
 168         if (len == 0) {
 169                 DEBUG(2, ("zero data called with zero length range\n"));
 170                 return NT_STATUS_OK;
 171         }
 172
 173         init_strict_lock_struct(fsp,
 174                                 fsp->op->global->open_persistent_id,
 175                                 zdata_info.file_off,
 176                                 len,
 177                                 WRITE_LOCK,
 178                                 &lck);
 179
 180         if (!SMB_VFS_STRICT_LOCK(fsp->conn, fsp, &lck)) {
 181                 DEBUG(2, ("failed to lock range for zero-data\n"));
 182                 return NT_STATUS_FILE_LOCK_CONFLICT;
 183         }
 184
 185         /*
 186          * MS-FSCC <58> Section 2.3.65
 187          * This FSCTL sets the range of bytes to zero (0) without extending the
 188          * file size.
 189          *
 190          * The VFS_FALLOCATE_FL_KEEP_SIZE flag is used to satisfy this
 191          * constraint.
 192          */
 193
 194         mode = VFS_FALLOCATE_FL_PUNCH_HOLE | VFS_FALLOCATE_FL_KEEP_SIZE;
 195         ret = SMB_VFS_FALLOCATE(fsp, mode, zdata_info.file_off, len);
 196         if (ret == -1)  {
 197                 status = map_nt_error_from_unix_common(errno);
 198                 DEBUG(2, ("zero-data fallocate(0x%x) failed: %s\n", mode,
 199                       strerror(errno)));
 200                 SMB_VFS_STRICT_UNLOCK(fsp->conn, fsp, &lck);
 201                 return status;
 202         }
 203
 204         if (!fsp->is_sparse && lp_strict_allocate(SNUM(fsp->conn))) {
 205                 /*
 206                  * File marked non-sparse and "strict allocate" is enabled -
 207                  * allocate the range that we just punched out.
 208                  * In future FALLOC_FL_ZERO_RANGE could be used exclusively for
 209                  * this, but it's currently only supported on XFS and ext4.
 210                  *
 211                  * The newly allocated range still won't be found by SEEK_DATA
 212                  * for QAR, but stat.st_blocks will reflect it.
 213                  */
 214                 ret = SMB_VFS_FALLOCATE(fsp, VFS_FALLOCATE_FL_KEEP_SIZE,
 215                                         zdata_info.file_off, len);
 216                 if (ret == -1)  {
 217                         status = map_nt_error_from_unix_common(errno);
 218                         DEBUG(0, ("fallocate failed: %s\n", strerror(errno)));
 219                         SMB_VFS_STRICT_UNLOCK(fsp->conn, fsp, &lck);
 220                         return status;
 221                 }
 222         }
 223
 224         SMB_VFS_STRICT_UNLOCK(fsp->conn, fsp, &lck);
 225         return NT_STATUS_OK;
 226 }
 227
 228 struct tevent_req *smb2_ioctl_filesys(uint32_t ctl_code,
 229                                       struct tevent_context *ev,
 230                                       struct tevent_req *req,
 231                                       struct smbd_smb2_ioctl_state *state)
 232 {
 233         NTSTATUS status;
 234
 235         switch (ctl_code) {
 236         case FSCTL_GET_COMPRESSION:
 237                 status = fsctl_get_cmprn(state, ev, state->fsp,
 238                                          state->in_max_output,
 239                                          &state->out_output);
 240                 if (!tevent_req_nterror(req, status)) {
 241                         tevent_req_done(req);
 242                 }
 243                 return tevent_req_post(req, ev);
 244                 break;
 245         case FSCTL_SET_COMPRESSION:
 246                 status = fsctl_set_cmprn(state, ev, state->fsp,
 247                                          &state->in_input);
 248                 if (!tevent_req_nterror(req, status)) {
 249                         tevent_req_done(req);
 250                 }
 251                 return tevent_req_post(req, ev);
 252                 break;
 253         case FSCTL_SET_ZERO_DATA:
 254                 status = fsctl_zero_data(state, ev, state->fsp,
 255                                          &state->in_input);
 256                 if (!tevent_req_nterror(req, status)) {
 257                         tevent_req_done(req);
 258                 }
 259                 return tevent_req_post(req, ev);
 260                 break;
 261         default: {
 262                 uint8_t *out_data = NULL;
 263                 uint32_t out_data_len = 0;
 264
 265                 if (state->fsp == NULL) {
 266                         status = NT_STATUS_NOT_SUPPORTED;
 267                 } else {
 268                         status = SMB_VFS_FSCTL(state->fsp,
 269                                                state,
 270                                                ctl_code,
 271                                                state->smbreq->flags2,
 272                                                state->in_input.data,
 273                                                state->in_input.length,
 274                                                &out_data,
 275                                                state->in_max_output,
 276                                                &out_data_len);
 277                         state->out_output = data_blob_const(out_data, out_data_len);
 278                         if (NT_STATUS_IS_OK(status)) {
 279                                 tevent_req_done(req);
 280                                 return tevent_req_post(req, ev);
 281                         }
 282                 }
 283
 284                 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED)) {
 285                         if (IS_IPC(state->smbreq->conn)) {
 286                                 status = NT_STATUS_FS_DRIVER_REQUIRED;
 287                         } else {
 288                                 status = NT_STATUS_INVALID_DEVICE_REQUEST;
 289                         }
 290                 }
 291
 292                 tevent_req_nterror(req, status);
 293                 return tevent_req_post(req, ev);
 294                 break;
 295         }
 296         }
 297
 298         tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 299         return tevent_req_post(req, ev);
 300 }