source3/smbd/smb2_write.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 "rpc_server/srv_pipe_hnd.h"
  27
  28 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
  29                                                struct tevent_context *ev,
  30                                                struct smbd_smb2_request *smb2req,
  31                                                struct files_struct *in_fsp,
  32                                                DATA_BLOB in_data,
  33                                                uint64_t in_offset,
  34                                                uint32_t in_flags);
  35 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
  36                                      uint32_t *out_count);
  37
  38 static void smbd_smb2_request_write_done(struct tevent_req *subreq);
  39 NTSTATUS smbd_smb2_request_process_write(struct smbd_smb2_request *req)
  40 {
  41         NTSTATUS status;
  42         const uint8_t *inbody;
  43         uint16_t in_data_offset;
  44         uint32_t in_data_length;
  45         DATA_BLOB in_data_buffer;
  46         uint64_t in_offset;
  47         uint64_t in_file_id_persistent;
  48         uint64_t in_file_id_volatile;
  49         struct files_struct *in_fsp;
  50         uint32_t in_flags;
  51         size_t in_dyn_len = 0;
  52         uint8_t *in_dyn_ptr = NULL;
  53         struct tevent_req *subreq;
  54
  55         status = smbd_smb2_request_verify_sizes(req, 0x31);
  56         if (!NT_STATUS_IS_OK(status)) {
  57                 return smbd_smb2_request_error(req, status);
  58         }
  59         inbody = SMBD_SMB2_IN_BODY_PTR(req);
  60
  61         in_data_offset          = SVAL(inbody, 0x02);
  62         in_data_length          = IVAL(inbody, 0x04);
  63         in_offset               = BVAL(inbody, 0x08);
  64         in_file_id_persistent   = BVAL(inbody, 0x10);
  65         in_file_id_volatile     = BVAL(inbody, 0x18);
  66         in_flags                = IVAL(inbody, 0x2C);
  67
  68         if (in_data_offset != (SMB2_HDR_BODY + SMBD_SMB2_IN_BODY_LEN(req))) {
  69                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  70         }
  71
  72         if (req->smb1req != NULL && req->smb1req->unread_bytes > 0) {
  73                 in_dyn_ptr = NULL;
  74                 in_dyn_len = req->smb1req->unread_bytes;
  75         } else {
  76                 in_dyn_ptr = SMBD_SMB2_IN_DYN_PTR(req);
  77                 in_dyn_len = SMBD_SMB2_IN_DYN_LEN(req);
  78         }
  79
  80         if (in_data_length > in_dyn_len) {
  81                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  82         }
  83
  84         /* check the max write size */
  85         if (in_data_length > req->sconn->smb2.max_write) {
  86                 DEBUG(2,("smbd_smb2_request_process_write : "
  87                         "client ignored max write :%s: 0x%08X: 0x%08X\n",
  88                         __location__, in_data_length, req->sconn->smb2.max_write));
  89                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  90         }
  91
  92         /*
  93          * Note: that in_dyn_ptr is NULL for the recvfile case.
  94          */
  95         in_data_buffer.data = in_dyn_ptr;
  96         in_data_buffer.length = in_data_length;
  97
  98         status = smbd_smb2_request_verify_creditcharge(req, in_data_length);
  99         if (!NT_STATUS_IS_OK(status)) {
 100                 return smbd_smb2_request_error(req, status);
 101         }
 102
 103         in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile);
 104         if (in_fsp == NULL) {
 105                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
 106         }
 107
 108         subreq = smbd_smb2_write_send(req, req->sconn->ev_ctx,
 109                                       req, in_fsp,
 110                                       in_data_buffer,
 111                                       in_offset,
 112                                       in_flags);
 113         if (subreq == NULL) {
 114                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 115         }
 116         tevent_req_set_callback(subreq, smbd_smb2_request_write_done, req);
 117
 118         return smbd_smb2_request_pending_queue(req, subreq, 500);
 119 }
 120
 121 static void smbd_smb2_request_write_done(struct tevent_req *subreq)
 122 {
 123         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 124                                         struct smbd_smb2_request);
 125         DATA_BLOB outbody;
 126         DATA_BLOB outdyn;
 127         uint32_t out_count = 0;
 128         NTSTATUS status;
 129         NTSTATUS error; /* transport error */
 130
 131         status = smbd_smb2_write_recv(subreq, &out_count);
 132         TALLOC_FREE(subreq);
 133         if (!NT_STATUS_IS_OK(status)) {
 134                 error = smbd_smb2_request_error(req, status);
 135                 if (!NT_STATUS_IS_OK(error)) {
 136                         smbd_server_connection_terminate(req->sconn,
 137                                                          nt_errstr(error));
 138                         return;
 139                 }
 140                 return;
 141         }
 142
 143         outbody = smbd_smb2_generate_outbody(req, 0x10);
 144         if (outbody.data == NULL) {
 145                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 146                 if (!NT_STATUS_IS_OK(error)) {
 147                         smbd_server_connection_terminate(req->sconn,
 148                                                          nt_errstr(error));
 149                         return;
 150                 }
 151                 return;
 152         }
 153
 154         SSVAL(outbody.data, 0x00, 0x10 + 1);    /* struct size */
 155         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 156         SIVAL(outbody.data, 0x04, out_count);   /* count */
 157         SIVAL(outbody.data, 0x08, 0);           /* remaining */
 158         SSVAL(outbody.data, 0x0C, 0);           /* write channel info offset */
 159         SSVAL(outbody.data, 0x0E, 0);           /* write channel info length */
 160
 161         outdyn = data_blob_const(NULL, 0);
 162
 163         error = smbd_smb2_request_done(req, outbody, &outdyn);
 164         if (!NT_STATUS_IS_OK(error)) {
 165                 smbd_server_connection_terminate(req->sconn, nt_errstr(error));
 166                 return;
 167         }
 168 }
 169
 170 struct smbd_smb2_write_state {
 171         struct smbd_smb2_request *smb2req;
 172         struct smb_request *smbreq;
 173         files_struct *fsp;
 174         bool write_through;
 175         uint32_t in_length;
 176         uint64_t in_offset;
 177         uint32_t out_count;
 178 };
 179
 180 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq);
 181
 182 static NTSTATUS smb2_write_complete_internal(struct tevent_req *req,
 183                                              ssize_t nwritten, int err,
 184                                              bool do_sync)
 185 {
 186         NTSTATUS status;
 187         struct smbd_smb2_write_state *state = tevent_req_data(req,
 188                                         struct smbd_smb2_write_state);
 189         files_struct *fsp = state->fsp;
 190
 191         if (nwritten == -1) {
 192                 status = map_nt_error_from_unix(err);
 193
 194                 DEBUG(2, ("smb2_write failed: %s, file %s, "
 195                           "length=%lu offset=%lu nwritten=-1: %s\n",
 196                           fsp_fnum_dbg(fsp),
 197                           fsp_str_dbg(fsp),
 198                           (unsigned long)state->in_length,
 199                           (unsigned long)state->in_offset,
 200                           nt_errstr(status)));
 201
 202                 return status;
 203         }
 204
 205         DEBUG(3,("smb2: %s, file %s, "
 206                 "length=%lu offset=%lu wrote=%lu\n",
 207                 fsp_fnum_dbg(fsp),
 208                 fsp_str_dbg(fsp),
 209                 (unsigned long)state->in_length,
 210                 (unsigned long)state->in_offset,
 211                 (unsigned long)nwritten));
 212
 213         if ((nwritten == 0) && (state->in_length != 0)) {
 214                 DEBUG(5,("smb2: write [%s] disk full\n",
 215                         fsp_str_dbg(fsp)));
 216                 return NT_STATUS_DISK_FULL;
 217         }
 218
 219         if (do_sync) {
 220                 status = sync_file(fsp->conn, fsp, state->write_through);
 221                 if (!NT_STATUS_IS_OK(status)) {
 222                         DEBUG(5,("smb2: sync_file for %s returned %s\n",
 223                                  fsp_str_dbg(fsp),
 224                                  nt_errstr(status)));
 225                         return status;
 226                 }
 227         }
 228
 229         state->out_count = nwritten;
 230
 231         return NT_STATUS_OK;
 232 }
 233
 234 NTSTATUS smb2_write_complete(struct tevent_req *req, ssize_t nwritten, int err)
 235 {
 236         return smb2_write_complete_internal(req, nwritten, err, true);
 237 }
 238
 239 NTSTATUS smb2_write_complete_nosync(struct tevent_req *req, ssize_t nwritten,
 240                                     int err)
 241 {
 242         return smb2_write_complete_internal(req, nwritten, err, false);
 243 }
 244
 245
 246 static bool smbd_smb2_write_cancel(struct tevent_req *req)
 247 {
 248         struct smbd_smb2_write_state *state =
 249                 tevent_req_data(req,
 250                 struct smbd_smb2_write_state);
 251
 252         return cancel_smb2_aio(state->smbreq);
 253 }
 254
 255 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
 256                                                struct tevent_context *ev,
 257                                                struct smbd_smb2_request *smb2req,
 258                                                struct files_struct *fsp,
 259                                                DATA_BLOB in_data,
 260                                                uint64_t in_offset,
 261                                                uint32_t in_flags)
 262 {
 263         NTSTATUS status;
 264         struct tevent_req *req = NULL;
 265         struct smbd_smb2_write_state *state = NULL;
 266         struct smb_request *smbreq = NULL;
 267         connection_struct *conn = smb2req->tcon->compat;
 268         ssize_t nwritten;
 269         struct lock_struct lock;
 270
 271         req = tevent_req_create(mem_ctx, &state,
 272                                 struct smbd_smb2_write_state);
 273         if (req == NULL) {
 274                 return NULL;
 275         }
 276         state->smb2req = smb2req;
 277         if (in_flags & SMB2_WRITEFLAG_WRITE_THROUGH) {
 278                 state->write_through = true;
 279         }
 280         state->in_length = in_data.length;
 281         state->out_count = 0;
 282
 283         DEBUG(10,("smbd_smb2_write: %s - %s\n",
 284                   fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));
 285
 286         smbreq = smbd_smb2_fake_smb_request(smb2req);
 287         if (tevent_req_nomem(smbreq, req)) {
 288                 return tevent_req_post(req, ev);
 289         }
 290         state->smbreq = smbreq;
 291
 292         state->fsp = fsp;
 293
 294         if (IS_IPC(smbreq->conn)) {
 295                 struct tevent_req *subreq = NULL;
 296
 297                 if (!fsp_is_np(fsp)) {
 298                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 299                         return tevent_req_post(req, ev);
 300                 }
 301
 302                 subreq = np_write_send(state, ev,
 303                                        fsp->fake_file_handle,
 304                                        in_data.data,
 305                                        in_data.length);
 306                 if (tevent_req_nomem(subreq, req)) {
 307                         return tevent_req_post(req, ev);
 308                 }
 309                 tevent_req_set_callback(subreq,
 310                                         smbd_smb2_write_pipe_done,
 311                                         req);
 312                 return req;
 313         }
 314
 315         if (!CHECK_WRITE(fsp)) {
 316                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 317                 return tevent_req_post(req, ev);
 318         }
 319
 320         /* Try and do an asynchronous write. */
 321         status = schedule_aio_smb2_write(conn,
 322                                         smbreq,
 323                                         fsp,
 324                                         in_offset,
 325                                         in_data,
 326                                         state->write_through);
 327
 328         if (NT_STATUS_IS_OK(status)) {
 329                 /*
 330                  * Doing an async write, allow this
 331                  * request to be canceled
 332                  */
 333                 tevent_req_set_cancel_fn(req, smbd_smb2_write_cancel);
 334                 return req;
 335         }
 336
 337         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 338                 /* Real error in setting up aio. Fail. */
 339                 tevent_req_nterror(req, status);
 340                 return tevent_req_post(req, ev);
 341         }
 342
 343         /* Fallback to synchronous. */
 344         init_strict_lock_struct(fsp,
 345                                 fsp->op->global->open_persistent_id,
 346                                 in_offset,
 347                                 in_data.length,
 348                                 WRITE_LOCK,
 349                                 &lock);
 350
 351         if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
 352                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
 353                 return tevent_req_post(req, ev);
 354         }
 355
 356         /*
 357          * Note: in_data.data is NULL for the recvfile case.
 358          */
 359         nwritten = write_file(smbreq, fsp,
 360                               (const char *)in_data.data,
 361                               in_offset,
 362                               in_data.length);
 363
 364         status = smb2_write_complete(req, nwritten, errno);
 365
 366         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 367
 368         DEBUG(10,("smb2: write on "
 369                 "file %s, offset %.0f, requested %u, written = %u\n",
 370                 fsp_str_dbg(fsp),
 371                 (double)in_offset,
 372                 (unsigned int)in_data.length,
 373                 (unsigned int)nwritten ));
 374
 375         if (!NT_STATUS_IS_OK(status)) {
 376                 tevent_req_nterror(req, status);
 377         } else {
 378                 /* Success. */
 379                 tevent_req_done(req);
 380         }
 381
 382         return tevent_req_post(req, ev);
 383 }
 384
 385 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq)
 386 {
 387         struct tevent_req *req = tevent_req_callback_data(subreq,
 388                                  struct tevent_req);
 389         struct smbd_smb2_write_state *state = tevent_req_data(req,
 390                                               struct smbd_smb2_write_state);
 391         NTSTATUS status;
 392         ssize_t nwritten = -1;
 393
 394         status = np_write_recv(subreq, &nwritten);
 395         TALLOC_FREE(subreq);
 396         if (!NT_STATUS_IS_OK(status)) {
 397                 NTSTATUS old = status;
 398                 status = nt_status_np_pipe(old);
 399                 tevent_req_nterror(req, status);
 400                 return;
 401         }
 402
 403         if ((nwritten == 0 && state->in_length != 0) || (nwritten < 0)) {
 404                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 405                 return;
 406         }
 407
 408         state->out_count = nwritten;
 409
 410         tevent_req_done(req);
 411 }
 412
 413 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
 414                                      uint32_t *out_count)
 415 {
 416         NTSTATUS status;
 417         struct smbd_smb2_write_state *state = tevent_req_data(req,
 418                                               struct smbd_smb2_write_state);
 419
 420         if (tevent_req_is_nterror(req, &status)) {
 421                 tevent_req_received(req);
 422                 return status;
 423         }
 424
 425         *out_count = state->out_count;
 426
 427         tevent_req_received(req);
 428         return NT_STATUS_OK;
 429 }