libcli/smb/smb2cli_ioctl.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    smb2 lib
   4    Copyright (C) Stefan Metzmacher 2011
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "system/network.h"
  22 #include "lib/util/tevent_ntstatus.h"
  23 #include "smb_common.h"
  24 #include "smbXcli_base.h"
  25
  26 struct smb2cli_ioctl_state {
  27         uint8_t fixed[0x38];
  28         uint8_t dyn_pad[1];
  29         uint32_t max_input_length;
  30         uint32_t max_output_length;
  31         struct iovec *recv_iov;
  32         bool out_valid;
  33         DATA_BLOB out_input_buffer;
  34         DATA_BLOB out_output_buffer;
  35         uint32_t ctl_code;
  36 };
  37
  38 static void smb2cli_ioctl_done(struct tevent_req *subreq);
  39
  40 struct tevent_req *smb2cli_ioctl_send(TALLOC_CTX *mem_ctx,
  41                                       struct tevent_context *ev,
  42                                       struct smbXcli_conn *conn,
  43                                       uint32_t timeout_msec,
  44                                       struct smbXcli_session *session,
  45                                       struct smbXcli_tcon *tcon,
  46                                       uint64_t in_fid_persistent,
  47                                       uint64_t in_fid_volatile,
  48                                       uint32_t in_ctl_code,
  49                                       uint32_t in_max_input_length,
  50                                       const DATA_BLOB *in_input_buffer,
  51                                       uint32_t in_max_output_length,
  52                                       const DATA_BLOB *in_output_buffer,
  53                                       uint32_t in_flags)
  54 {
  55         struct tevent_req *req, *subreq;
  56         struct smb2cli_ioctl_state *state;
  57         uint8_t *fixed;
  58         uint8_t *dyn;
  59         size_t dyn_len;
  60         uint32_t input_buffer_offset = 0;
  61         uint32_t input_buffer_length = 0;
  62         uint32_t output_buffer_offset = 0;
  63         uint32_t output_buffer_length = 0;
  64         uint32_t pad_length = 0;
  65         uint64_t tmp64;
  66         uint32_t max_dyn_len = 0;
  67
  68         req = tevent_req_create(mem_ctx, &state,
  69                                 struct smb2cli_ioctl_state);
  70         if (req == NULL) {
  71                 return NULL;
  72         }
  73         state->ctl_code = in_ctl_code;
  74         state->max_input_length = in_max_input_length;
  75         state->max_output_length = in_max_output_length;
  76
  77         tmp64 = in_max_input_length;
  78         tmp64 += in_max_output_length;
  79         if (tmp64 > UINT32_MAX) {
  80                 max_dyn_len = UINT32_MAX;
  81         } else {
  82                 max_dyn_len = tmp64;
  83         }
  84
  85         if (in_input_buffer) {
  86                 input_buffer_offset = SMB2_HDR_BODY+0x38;
  87                 input_buffer_length = in_input_buffer->length;
  88         }
  89
  90         if (in_output_buffer) {
  91                 output_buffer_offset = SMB2_HDR_BODY+0x38;
  92                 output_buffer_length = in_output_buffer->length;
  93                 if (input_buffer_length > 0 && output_buffer_length > 0) {
  94                         uint32_t tmp;
  95                         output_buffer_offset += input_buffer_length;
  96                         tmp = output_buffer_offset;
  97                         output_buffer_offset = NDR_ROUND(output_buffer_offset, 8);
  98                         pad_length = output_buffer_offset - tmp;
  99                 }
 100         }
 101
 102         fixed = state->fixed;
 103
 104         SSVAL(fixed, 0x00, 0x39);
 105         SSVAL(fixed, 0x02, 0); /* reserved */
 106         SIVAL(fixed, 0x04, in_ctl_code);
 107         SBVAL(fixed, 0x08, in_fid_persistent);
 108         SBVAL(fixed, 0x10, in_fid_volatile);
 109         SIVAL(fixed, 0x18, input_buffer_offset);
 110         SIVAL(fixed, 0x1C, input_buffer_length);
 111         SIVAL(fixed, 0x20, in_max_input_length);
 112         SIVAL(fixed, 0x24, output_buffer_offset);
 113         SIVAL(fixed, 0x28, output_buffer_length);
 114         SIVAL(fixed, 0x2C, in_max_output_length);
 115         SIVAL(fixed, 0x30, in_flags);
 116         SIVAL(fixed, 0x34, 0); /* reserved */
 117
 118         if (input_buffer_length > 0 && output_buffer_length > 0) {
 119                 size_t avail = UINT32_MAX - (input_buffer_length + pad_length);
 120                 size_t ofs = output_buffer_offset - input_buffer_offset;
 121
 122                 if (avail < output_buffer_length) {
 123                         tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
 124                         return tevent_req_post(req, ev);
 125                 }
 126
 127                 dyn_len = input_buffer_length + output_buffer_length + pad_length;
 128
 129                 dyn = talloc_zero_array(state, uint8_t, dyn_len);
 130                 if (tevent_req_nomem(dyn, req)) {
 131                         return tevent_req_post(req, ev);
 132                 }
 133                 memcpy(dyn, in_input_buffer->data,
 134                        in_input_buffer->length);
 135                 memcpy(dyn + ofs, in_output_buffer->data,
 136                        in_output_buffer->length);
 137         } else if (input_buffer_length > 0) {
 138                 dyn = in_input_buffer->data;
 139                 dyn_len = in_input_buffer->length;
 140         } else if (output_buffer_length > 0) {
 141                 dyn = in_output_buffer->data;
 142                 dyn_len = in_output_buffer->length;
 143         } else {
 144                 dyn = state->dyn_pad;
 145                 dyn_len = sizeof(state->dyn_pad);
 146         }
 147
 148         subreq = smb2cli_req_send(state, ev, conn, SMB2_OP_IOCTL,
 149                                   0, 0, /* flags */
 150                                   timeout_msec,
 151                                   tcon,
 152                                   session,
 153                                   state->fixed, sizeof(state->fixed),
 154                                   dyn, dyn_len,
 155                                   max_dyn_len);
 156         if (tevent_req_nomem(subreq, req)) {
 157                 return tevent_req_post(req, ev);
 158         }
 159         tevent_req_set_callback(subreq, smb2cli_ioctl_done, req);
 160         return req;
 161 }
 162
 163 static void smb2cli_ioctl_done(struct tevent_req *subreq)
 164 {
 165         struct tevent_req *req =
 166                 tevent_req_callback_data(subreq,
 167                 struct tevent_req);
 168         struct smb2cli_ioctl_state *state =
 169                 tevent_req_data(req,
 170                 struct smb2cli_ioctl_state);
 171         NTSTATUS status;
 172         struct iovec *iov;
 173         uint8_t *fixed;
 174         uint8_t *dyn;
 175         size_t dyn_len;
 176         uint32_t dyn_ofs = SMB2_HDR_BODY + 0x30;
 177         uint32_t input_buffer_offset;
 178         uint32_t input_buffer_length;
 179         uint32_t output_buffer_offset;
 180         uint32_t output_buffer_length;
 181         static const struct smb2cli_req_expected_response expected[] = {
 182         {
 183                 .status = NT_STATUS_OK,
 184                 .body_size = 0x31
 185         },
 186         {
 187                 .status = STATUS_BUFFER_OVERFLOW,
 188                 .body_size = 0x31
 189         },
 190         {
 191                 /*
 192                  * We need to make sure that
 193                  * a response with NT_STATUS_FILE_CLOSED
 194                  * without signing generates NT_STATUS_ACCESS_DENIED
 195                  * if the request was signed.
 196                  */
 197                 .status = NT_STATUS_FILE_CLOSED,
 198                 .body_size = 0x09,
 199         },
 200         {
 201                 /*
 202                  * a normal error
 203                  */
 204                 .status = NT_STATUS_INVALID_PARAMETER,
 205                 .body_size = 0x09
 206         },
 207         {
 208                 /*
 209                  * a special case for FSCTL_SRV_COPYCHUNK_*
 210                  */
 211                 .status = NT_STATUS_INVALID_PARAMETER,
 212                 .body_size = 0x31
 213         },
 214         };
 215
 216         status = smb2cli_req_recv(subreq, state, &iov,
 217                                   expected, ARRAY_SIZE(expected));
 218         TALLOC_FREE(subreq);
 219         if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_PARAMETER)) {
 220                 switch (state->ctl_code) {
 221                 case FSCTL_SRV_COPYCHUNK:
 222                 case FSCTL_SRV_COPYCHUNK_WRITE:
 223                         break;
 224                 default:
 225                         tevent_req_nterror(req, status);
 226                         return;
 227                 }
 228
 229                 if (iov[1].iov_len != 0x30) {
 230                         tevent_req_nterror(req,
 231                                         NT_STATUS_INVALID_NETWORK_RESPONSE);
 232                         return;
 233                 }
 234         } else if (NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)) {
 235                 /* no error */
 236         } else {
 237                 if (tevent_req_nterror(req, status)) {
 238                         return;
 239                 }
 240         }
 241
 242         /*
 243          * At this stage we're sure that got a body size of 0x31,
 244          * either with NT_STATUS_OK, STATUS_BUFFER_OVERFLOW or
 245          * NT_STATUS_INVALID_PARAMETER.
 246          */
 247
 248         state->recv_iov = iov;
 249         fixed = (uint8_t *)iov[1].iov_base;
 250         dyn = (uint8_t *)iov[2].iov_base;
 251         dyn_len = iov[2].iov_len;
 252
 253         input_buffer_offset = IVAL(fixed, 0x18);
 254         input_buffer_length = IVAL(fixed, 0x1C);
 255         output_buffer_offset = IVAL(fixed, 0x20);
 256         output_buffer_length = IVAL(fixed, 0x24);
 257
 258         if ((input_buffer_offset > 0) && (input_buffer_length > 0)) {
 259                 uint32_t ofs;
 260
 261                 if (input_buffer_offset != dyn_ofs) {
 262                         tevent_req_nterror(
 263                                 req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 264                         return;
 265                 }
 266
 267                 ofs = input_buffer_length;
 268                 ofs = NDR_ROUND(ofs, 8);
 269
 270                 if (state->max_input_length == 0) {
 271                         /*
 272                          * If max_input_length is 0 we ignore
 273                          * the input_buffer_length, because
 274                          * Windows 2008 echos the DCERPC request
 275                          * from the requested input_buffer
 276                          * to the response input_buffer.
 277                          */
 278                         input_buffer_length = 0;
 279                 }
 280
 281                 if (input_buffer_length > dyn_len) {
 282                         tevent_req_nterror(
 283                                 req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 284                         return;
 285                 }
 286
 287                 if (input_buffer_length > state->max_input_length) {
 288                         tevent_req_nterror(
 289                                 req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 290                         return;
 291                 }
 292
 293                 state->out_input_buffer.data = dyn;
 294                 state->out_input_buffer.length = input_buffer_length;
 295
 296                 if (ofs > dyn_len) {
 297                         tevent_req_nterror(
 298                                 req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 299                         return;
 300                 }
 301
 302                 dyn_ofs += ofs;
 303                 dyn += ofs;
 304                 dyn_len -= ofs;
 305         }
 306
 307         if ((output_buffer_offset > 0) && (output_buffer_length > 0)) {
 308                 if (output_buffer_offset != dyn_ofs) {
 309                         tevent_req_nterror(
 310                                 req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 311                         return;
 312                 }
 313
 314                 if (state->max_output_length == 0) {
 315                         /*
 316                          * We do the same logic as for
 317                          * max_input_length.
 318                          */
 319                         output_buffer_length = 0;
 320                 }
 321
 322                 if (output_buffer_length > dyn_len) {
 323                         tevent_req_nterror(
 324                                 req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 325                         return;
 326                 }
 327
 328                 if (output_buffer_length > state->max_output_length) {
 329                         tevent_req_nterror(
 330                                 req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 331                         return;
 332                 }
 333
 334                 state->out_output_buffer.data = dyn;
 335                 state->out_output_buffer.length = output_buffer_length;
 336         }
 337
 338         state->out_valid = true;
 339
 340         if (tevent_req_nterror(req, status)) {
 341                 return;
 342         }
 343
 344         tevent_req_done(req);
 345 }
 346
 347 NTSTATUS smb2cli_ioctl_recv(struct tevent_req *req,
 348                             TALLOC_CTX *mem_ctx,
 349                             DATA_BLOB *out_input_buffer,
 350                             DATA_BLOB *out_output_buffer)
 351 {
 352         struct smb2cli_ioctl_state *state =
 353                 tevent_req_data(req,
 354                 struct smb2cli_ioctl_state);
 355         NTSTATUS status = NT_STATUS_OK;
 356
 357         if (tevent_req_is_nterror(req, &status) && !state->out_valid) {
 358                 if (out_input_buffer) {
 359                         *out_input_buffer = data_blob_null;
 360                 }
 361                 if (out_output_buffer) {
 362                         *out_output_buffer = data_blob_null;
 363                 }
 364                 tevent_req_received(req);
 365                 return status;
 366         }
 367
 368         talloc_steal(mem_ctx, state->recv_iov);
 369         if (out_input_buffer) {
 370                 *out_input_buffer = state->out_input_buffer;
 371         }
 372         if (out_output_buffer) {
 373                 *out_output_buffer = state->out_output_buffer;
 374         }
 375
 376         tevent_req_received(req);
 377         return status;
 378 }
 379
 380 NTSTATUS smb2cli_ioctl(struct smbXcli_conn *conn,
 381                        uint32_t timeout_msec,
 382                        struct smbXcli_session *session,
 383                        struct smbXcli_tcon *tcon,
 384                        uint64_t in_fid_persistent,
 385                        uint64_t in_fid_volatile,
 386                        uint32_t in_ctl_code,
 387                        uint32_t in_max_input_length,
 388                        const DATA_BLOB *in_input_buffer,
 389                        uint32_t in_max_output_length,
 390                        const DATA_BLOB *in_output_buffer,
 391                        uint32_t in_flags,
 392                        TALLOC_CTX *mem_ctx,
 393                        DATA_BLOB *out_input_buffer,
 394                        DATA_BLOB *out_output_buffer)
 395 {
 396         TALLOC_CTX *frame = talloc_stackframe();
 397         struct tevent_context *ev;
 398         struct tevent_req *req;
 399         NTSTATUS status = NT_STATUS_NO_MEMORY;
 400
 401         if (smbXcli_conn_has_async_calls(conn)) {
 402                 /*
 403                  * Can't use sync call while an async call is in flight
 404                  */
 405                 status = NT_STATUS_INVALID_PARAMETER_MIX;
 406                 goto fail;
 407         }
 408         ev = samba_tevent_context_init(frame);
 409         if (ev == NULL) {
 410                 goto fail;
 411         }
 412         req = smb2cli_ioctl_send(frame, ev, conn, timeout_msec,
 413                                  session, tcon,
 414                                  in_fid_persistent,
 415                                  in_fid_volatile,
 416                                  in_ctl_code,
 417                                  in_max_input_length,
 418                                  in_input_buffer,
 419                                  in_max_output_length,
 420                                  in_output_buffer,
 421                                  in_flags);
 422         if (req == NULL) {
 423                 goto fail;
 424         }
 425         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 426                 goto fail;
 427         }
 428         status = smb2cli_ioctl_recv(req, mem_ctx,
 429                                     out_input_buffer,
 430                                     out_output_buffer);
 431  fail:
 432         TALLOC_FREE(frame);
 433         return status;
 434 }