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