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 #include "printing.h"
  28
  29 #undef DBGC_CLASS
  30 #define DBGC_CLASS DBGC_SMB2
  31
  32 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
  33                                                struct tevent_context *ev,
  34                                                struct smbd_smb2_request *smb2req,
  35                                                struct files_struct *in_fsp,
  36                                                DATA_BLOB in_data,
  37                                                uint64_t in_offset,
  38                                                uint32_t in_flags);
  39 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
  40                                      uint32_t *out_count);
  41
  42 static void smbd_smb2_request_write_done(struct tevent_req *subreq);
  43 NTSTATUS smbd_smb2_request_process_write(struct smbd_smb2_request *req)
  44 {
  45         struct smbXsrv_connection *xconn = req->xconn;
  46         NTSTATUS status;
  47         const uint8_t *inbody;
  48         uint16_t in_data_offset;
  49         uint32_t in_data_length;
  50         DATA_BLOB in_data_buffer;
  51         uint64_t in_offset;
  52         uint64_t in_file_id_persistent;
  53         uint64_t in_file_id_volatile;
  54         struct files_struct *in_fsp;
  55         uint32_t in_flags;
  56         size_t in_dyn_len = 0;
  57         uint8_t *in_dyn_ptr = NULL;
  58         struct tevent_req *subreq;
  59
  60         status = smbd_smb2_request_verify_sizes(req, 0x31);
  61         if (!NT_STATUS_IS_OK(status)) {
  62                 return smbd_smb2_request_error(req, status);
  63         }
  64         inbody = SMBD_SMB2_IN_BODY_PTR(req);
  65
  66         in_data_offset          = SVAL(inbody, 0x02);
  67         in_data_length          = IVAL(inbody, 0x04);
  68         in_offset               = BVAL(inbody, 0x08);
  69         in_file_id_persistent   = BVAL(inbody, 0x10);
  70         in_file_id_volatile     = BVAL(inbody, 0x18);
  71         in_flags                = IVAL(inbody, 0x2C);
  72
  73         if (in_data_offset != (SMB2_HDR_BODY + SMBD_SMB2_IN_BODY_LEN(req))) {
  74                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  75         }
  76
  77         if (req->smb1req != NULL && req->smb1req->unread_bytes > 0) {
  78                 in_dyn_ptr = NULL;
  79                 in_dyn_len = req->smb1req->unread_bytes;
  80         } else {
  81                 in_dyn_ptr = SMBD_SMB2_IN_DYN_PTR(req);
  82                 in_dyn_len = SMBD_SMB2_IN_DYN_LEN(req);
  83         }
  84
  85         if (in_data_length > in_dyn_len) {
  86                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  87         }
  88
  89         /* check the max write size */
  90         if (in_data_length > xconn->smb2.server.max_write) {
  91                 DEBUG(2,("smbd_smb2_request_process_write : "
  92                         "client ignored max write :%s: 0x%08X: 0x%08X\n",
  93                         __location__, in_data_length, xconn->smb2.server.max_write));
  94                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  95         }
  96
  97         /*
  98          * Note: that in_dyn_ptr is NULL for the recvfile case.
  99          */
 100         in_data_buffer.data = in_dyn_ptr;
 101         in_data_buffer.length = in_data_length;
 102
 103         status = smbd_smb2_request_verify_creditcharge(req, in_data_length);
 104         if (!NT_STATUS_IS_OK(status)) {
 105                 return smbd_smb2_request_error(req, status);
 106         }
 107
 108         in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile);
 109         if (in_fsp == NULL) {
 110                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
 111         }
 112
 113         subreq = smbd_smb2_write_send(req, req->sconn->ev_ctx,
 114                                       req, in_fsp,
 115                                       in_data_buffer,
 116                                       in_offset,
 117                                       in_flags);
 118         if (subreq == NULL) {
 119                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 120         }
 121         tevent_req_set_callback(subreq, smbd_smb2_request_write_done, req);
 122
 123         return smbd_smb2_request_pending_queue(req, subreq, 500);
 124 }
 125
 126 static void smbd_smb2_request_write_done(struct tevent_req *subreq)
 127 {
 128         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 129                                         struct smbd_smb2_request);
 130         DATA_BLOB outbody;
 131         DATA_BLOB outdyn;
 132         uint32_t out_count = 0;
 133         NTSTATUS status;
 134         NTSTATUS error; /* transport error */
 135
 136         status = smbd_smb2_write_recv(subreq, &out_count);
 137         TALLOC_FREE(subreq);
 138         if (!NT_STATUS_IS_OK(status)) {
 139                 error = smbd_smb2_request_error(req, status);
 140                 if (!NT_STATUS_IS_OK(error)) {
 141                         smbd_server_connection_terminate(req->xconn,
 142                                                          nt_errstr(error));
 143                         return;
 144                 }
 145                 return;
 146         }
 147
 148         outbody = smbd_smb2_generate_outbody(req, 0x10);
 149         if (outbody.data == NULL) {
 150                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 151                 if (!NT_STATUS_IS_OK(error)) {
 152                         smbd_server_connection_terminate(req->xconn,
 153                                                          nt_errstr(error));
 154                         return;
 155                 }
 156                 return;
 157         }
 158
 159         SSVAL(outbody.data, 0x00, 0x10 + 1);    /* struct size */
 160         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 161         SIVAL(outbody.data, 0x04, out_count);   /* count */
 162         SIVAL(outbody.data, 0x08, 0);           /* remaining */
 163         SSVAL(outbody.data, 0x0C, 0);           /* write channel info offset */
 164         SSVAL(outbody.data, 0x0E, 0);           /* write channel info length */
 165
 166         outdyn = data_blob_const(NULL, 0);
 167
 168         error = smbd_smb2_request_done(req, outbody, &outdyn);
 169         if (!NT_STATUS_IS_OK(error)) {
 170                 smbd_server_connection_terminate(req->xconn, nt_errstr(error));
 171                 return;
 172         }
 173 }
 174
 175 struct smbd_smb2_write_state {
 176         struct smbd_smb2_request *smb2req;
 177         struct smb_request *smbreq;
 178         files_struct *fsp;
 179         bool write_through;
 180         uint32_t in_length;
 181         uint64_t in_offset;
 182         uint32_t out_count;
 183 };
 184
 185 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq);
 186
 187 static NTSTATUS smb2_write_complete_internal(struct tevent_req *req,
 188                                              ssize_t nwritten, int err,
 189                                              bool do_sync)
 190 {
 191         NTSTATUS status;
 192         struct smbd_smb2_write_state *state = tevent_req_data(req,
 193                                         struct smbd_smb2_write_state);
 194         files_struct *fsp = state->fsp;
 195
 196         if (nwritten == -1) {
 197                 status = map_nt_error_from_unix(err);
 198
 199                 DEBUG(2, ("smb2_write failed: %s, file %s, "
 200                           "length=%lu offset=%lu nwritten=-1: %s\n",
 201                           fsp_fnum_dbg(fsp),
 202                           fsp_str_dbg(fsp),
 203                           (unsigned long)state->in_length,
 204                           (unsigned long)state->in_offset,
 205                           nt_errstr(status)));
 206
 207                 return status;
 208         }
 209
 210         DEBUG(3,("smb2: %s, file %s, "
 211                 "length=%lu offset=%lu wrote=%lu\n",
 212                 fsp_fnum_dbg(fsp),
 213                 fsp_str_dbg(fsp),
 214                 (unsigned long)state->in_length,
 215                 (unsigned long)state->in_offset,
 216                 (unsigned long)nwritten));
 217
 218         if ((nwritten == 0) && (state->in_length != 0)) {
 219                 DEBUG(5,("smb2: write [%s] disk full\n",
 220                         fsp_str_dbg(fsp)));
 221                 return NT_STATUS_DISK_FULL;
 222         }
 223
 224         if (do_sync) {
 225                 status = sync_file(fsp->conn, fsp, state->write_through);
 226                 if (!NT_STATUS_IS_OK(status)) {
 227                         DEBUG(5,("smb2: sync_file for %s returned %s\n",
 228                                  fsp_str_dbg(fsp),
 229                                  nt_errstr(status)));
 230                         return status;
 231                 }
 232         }
 233
 234         state->out_count = nwritten;
 235
 236         return NT_STATUS_OK;
 237 }
 238
 239 NTSTATUS smb2_write_complete(struct tevent_req *req, ssize_t nwritten, int err)
 240 {
 241         return smb2_write_complete_internal(req, nwritten, err, true);
 242 }
 243
 244 NTSTATUS smb2_write_complete_nosync(struct tevent_req *req, ssize_t nwritten,
 245                                     int err)
 246 {
 247         return smb2_write_complete_internal(req, nwritten, err, false);
 248 }
 249
 250
 251 static bool smbd_smb2_write_cancel(struct tevent_req *req)
 252 {
 253         struct smbd_smb2_write_state *state =
 254                 tevent_req_data(req,
 255                 struct smbd_smb2_write_state);
 256
 257         return cancel_smb2_aio(state->smbreq);
 258 }
 259
 260 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
 261                                                struct tevent_context *ev,
 262                                                struct smbd_smb2_request *smb2req,
 263                                                struct files_struct *fsp,
 264                                                DATA_BLOB in_data,
 265                                                uint64_t in_offset,
 266                                                uint32_t in_flags)
 267 {
 268         NTSTATUS status;
 269         struct tevent_req *req = NULL;
 270         struct smbd_smb2_write_state *state = NULL;
 271         struct smb_request *smbreq = NULL;
 272         connection_struct *conn = smb2req->tcon->compat;
 273         ssize_t nwritten;
 274         struct lock_struct lock;
 275
 276         req = tevent_req_create(mem_ctx, &state,
 277                                 struct smbd_smb2_write_state);
 278         if (req == NULL) {
 279                 return NULL;
 280         }
 281         state->smb2req = smb2req;
 282         if (smb2req->xconn->protocol >= PROTOCOL_SMB3_02) {
 283                 if (in_flags & SMB2_WRITEFLAG_WRITE_UNBUFFERED) {
 284                         state->write_through = true;
 285                 }
 286         }
 287         if (in_flags & SMB2_WRITEFLAG_WRITE_THROUGH) {
 288                 state->write_through = true;
 289         }
 290         state->in_length = in_data.length;
 291         state->out_count = 0;
 292
 293         DEBUG(10,("smbd_smb2_write: %s - %s\n",
 294                   fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));
 295
 296         smbreq = smbd_smb2_fake_smb_request(smb2req);
 297         if (tevent_req_nomem(smbreq, req)) {
 298                 return tevent_req_post(req, ev);
 299         }
 300         state->smbreq = smbreq;
 301
 302         state->fsp = fsp;
 303
 304         if (IS_IPC(smbreq->conn)) {
 305                 struct tevent_req *subreq = NULL;
 306
 307                 if (!fsp_is_np(fsp)) {
 308                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 309                         return tevent_req_post(req, ev);
 310                 }
 311
 312                 subreq = np_write_send(state, ev,
 313                                        fsp->fake_file_handle,
 314                                        in_data.data,
 315                                        in_data.length);
 316                 if (tevent_req_nomem(subreq, req)) {
 317                         return tevent_req_post(req, ev);
 318                 }
 319                 tevent_req_set_callback(subreq,
 320                                         smbd_smb2_write_pipe_done,
 321                                         req);
 322                 return req;
 323         }
 324
 325         if (IS_PRINT(smbreq->conn)) {
 326                 uint32_t out_count = 0;
 327                 int ret;
 328
 329                 if (fsp->print_file == NULL) {
 330                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 331                         return tevent_req_post(req, ev);
 332                 }
 333
 334                 ret = print_spool_write(fsp,
 335                                         (const char *)in_data.data,
 336                                         in_data.length,
 337                                         in_offset,
 338                                         &out_count);
 339                 if (ret) {
 340                         status = map_nt_error_from_unix(ret);
 341                         tevent_req_nterror(req, status);
 342                         return tevent_req_post(req, ev);
 343                 }
 344                 state->out_count = out_count;
 345                 tevent_req_done(req);
 346                 return tevent_req_post(req, ev);
 347         }
 348
 349         if (!CHECK_WRITE(fsp)) {
 350                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 351                 return tevent_req_post(req, ev);
 352         }
 353
 354         /* Try and do an asynchronous write. */
 355         status = schedule_aio_smb2_write(conn,
 356                                         smbreq,
 357                                         fsp,
 358                                         in_offset,
 359                                         in_data,
 360                                         state->write_through);
 361
 362         if (NT_STATUS_IS_OK(status)) {
 363                 /*
 364                  * Doing an async write, allow this
 365                  * request to be canceled
 366                  */
 367                 tevent_req_set_cancel_fn(req, smbd_smb2_write_cancel);
 368                 return req;
 369         }
 370
 371         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 372                 /* Real error in setting up aio. Fail. */
 373                 tevent_req_nterror(req, status);
 374                 return tevent_req_post(req, ev);
 375         }
 376
 377         /* Fallback to synchronous. */
 378         init_strict_lock_struct(fsp,
 379                                 fsp->op->global->open_persistent_id,
 380                                 in_offset,
 381                                 in_data.length,
 382                                 WRITE_LOCK,
 383                                 &lock);
 384
 385         if (!SMB_VFS_STRICT_LOCK_CHECK(conn, fsp, &lock)) {
 386                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
 387                 return tevent_req_post(req, ev);
 388         }
 389
 390         /*
 391          * Note: in_data.data is NULL for the recvfile case.
 392          */
 393         nwritten = write_file(smbreq, fsp,
 394                               (const char *)in_data.data,
 395                               in_offset,
 396                               in_data.length);
 397
 398         status = smb2_write_complete(req, nwritten, errno);
 399
 400         DEBUG(10,("smb2: write on "
 401                 "file %s, offset %.0f, requested %u, written = %u\n",
 402                 fsp_str_dbg(fsp),
 403                 (double)in_offset,
 404                 (unsigned int)in_data.length,
 405                 (unsigned int)nwritten ));
 406
 407         if (!NT_STATUS_IS_OK(status)) {
 408                 tevent_req_nterror(req, status);
 409         } else {
 410                 /* Success. */
 411                 tevent_req_done(req);
 412         }
 413
 414         return tevent_req_post(req, ev);
 415 }
 416
 417 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq)
 418 {
 419         struct tevent_req *req = tevent_req_callback_data(subreq,
 420                                  struct tevent_req);
 421         struct smbd_smb2_write_state *state = tevent_req_data(req,
 422                                               struct smbd_smb2_write_state);
 423         NTSTATUS status;
 424         ssize_t nwritten = -1;
 425
 426         status = np_write_recv(subreq, &nwritten);
 427         TALLOC_FREE(subreq);
 428         if (!NT_STATUS_IS_OK(status)) {
 429                 NTSTATUS old = status;
 430                 status = nt_status_np_pipe(old);
 431                 tevent_req_nterror(req, status);
 432                 return;
 433         }
 434
 435         if ((nwritten == 0 && state->in_length != 0) || (nwritten < 0)) {
 436                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 437                 return;
 438         }
 439
 440         state->out_count = nwritten;
 441
 442         tevent_req_done(req);
 443 }
 444
 445 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
 446                                      uint32_t *out_count)
 447 {
 448         NTSTATUS status;
 449         struct smbd_smb2_write_state *state = tevent_req_data(req,
 450                                               struct smbd_smb2_write_state);
 451
 452         if (tevent_req_is_nterror(req, &status)) {
 453                 tevent_req_received(req);
 454                 return status;
 455         }
 456
 457         *out_count = state->out_count;
 458
 459         tevent_req_received(req);
 460         return NT_STATUS_OK;
 461 }