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                                                uint32_t in_smbpid,
  33                                                DATA_BLOB in_data,
  34                                                uint64_t in_offset,
  35                                                uint32_t in_flags);
  36 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
  37                                      uint32_t *out_count);
  38
  39 static void smbd_smb2_request_write_done(struct tevent_req *subreq);
  40 NTSTATUS smbd_smb2_request_process_write(struct smbd_smb2_request *req)
  41 {
  42         NTSTATUS status;
  43         const uint8_t *inhdr;
  44         const uint8_t *inbody;
  45         int i = req->current_idx;
  46         uint32_t in_smbpid;
  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         struct tevent_req *subreq;
  56
  57         status = smbd_smb2_request_verify_sizes(req, 0x31);
  58         if (!NT_STATUS_IS_OK(status)) {
  59                 return smbd_smb2_request_error(req, status);
  60         }
  61         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
  62         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  63
  64         in_smbpid = IVAL(inhdr, SMB2_HDR_PID);
  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 + req->in.vector[i+1].iov_len)) {
  74                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  75         }
  76
  77         if (in_data_length > req->in.vector[i+2].iov_len) {
  78                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  79         }
  80
  81         /* check the max write size */
  82         if (in_data_length > req->sconn->smb2.max_write) {
  83                 DEBUG(2,("smbd_smb2_request_process_write : "
  84                         "client ignored max write :%s: 0x%08X: 0x%08X\n",
  85                         __location__, in_data_length, req->sconn->smb2.max_write));
  86                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  87         }
  88
  89         in_data_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
  90         in_data_buffer.length = in_data_length;
  91
  92         status = smbd_smb2_request_verify_creditcharge(req, in_data_length);
  93         if (!NT_STATUS_IS_OK(status)) {
  94                 return smbd_smb2_request_error(req, status);
  95         }
  96
  97         in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile);
  98         if (in_fsp == NULL) {
  99                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
 100         }
 101
 102         subreq = smbd_smb2_write_send(req, req->sconn->ev_ctx,
 103                                       req, in_fsp,
 104                                       in_smbpid,
 105                                       in_data_buffer,
 106                                       in_offset,
 107                                       in_flags);
 108         if (subreq == NULL) {
 109                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 110         }
 111         tevent_req_set_callback(subreq, smbd_smb2_request_write_done, req);
 112
 113         return smbd_smb2_request_pending_queue(req, subreq, 500);
 114 }
 115
 116 static void smbd_smb2_request_write_done(struct tevent_req *subreq)
 117 {
 118         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 119                                         struct smbd_smb2_request);
 120         DATA_BLOB outbody;
 121         DATA_BLOB outdyn;
 122         uint32_t out_count = 0;
 123         NTSTATUS status;
 124         NTSTATUS error; /* transport error */
 125
 126         status = smbd_smb2_write_recv(subreq, &out_count);
 127         TALLOC_FREE(subreq);
 128         if (!NT_STATUS_IS_OK(status)) {
 129                 error = smbd_smb2_request_error(req, status);
 130                 if (!NT_STATUS_IS_OK(error)) {
 131                         smbd_server_connection_terminate(req->sconn,
 132                                                          nt_errstr(error));
 133                         return;
 134                 }
 135                 return;
 136         }
 137
 138         outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
 139         if (outbody.data == NULL) {
 140                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 141                 if (!NT_STATUS_IS_OK(error)) {
 142                         smbd_server_connection_terminate(req->sconn,
 143                                                          nt_errstr(error));
 144                         return;
 145                 }
 146                 return;
 147         }
 148
 149         SSVAL(outbody.data, 0x00, 0x10 + 1);    /* struct size */
 150         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 151         SIVAL(outbody.data, 0x04, out_count);   /* count */
 152         SIVAL(outbody.data, 0x08, 0);           /* remaining */
 153         SSVAL(outbody.data, 0x0C, 0);           /* write channel info offset */
 154         SSVAL(outbody.data, 0x0E, 0);           /* write channel info length */
 155
 156         outdyn = data_blob_const(NULL, 0);
 157
 158         error = smbd_smb2_request_done(req, outbody, &outdyn);
 159         if (!NT_STATUS_IS_OK(error)) {
 160                 smbd_server_connection_terminate(req->sconn, nt_errstr(error));
 161                 return;
 162         }
 163 }
 164
 165 struct smbd_smb2_write_state {
 166         struct smbd_smb2_request *smb2req;
 167         struct smb_request *smbreq;
 168         files_struct *fsp;
 169         bool write_through;
 170         uint32_t in_length;
 171         uint64_t in_offset;
 172         uint32_t out_count;
 173 };
 174
 175 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq);
 176
 177 static NTSTATUS smb2_write_complete_internal(struct tevent_req *req,
 178                                              ssize_t nwritten, int err,
 179                                              bool do_sync)
 180 {
 181         NTSTATUS status;
 182         struct smbd_smb2_write_state *state = tevent_req_data(req,
 183                                         struct smbd_smb2_write_state);
 184         files_struct *fsp = state->fsp;
 185
 186         if (nwritten == -1) {
 187                 status = map_nt_error_from_unix(err);
 188
 189                 DEBUG(2, ("smb2_write failed: %s, file %s, "
 190                           "length=%lu offset=%lu nwritten=-1: %s\n",
 191                           fsp_fnum_dbg(fsp),
 192                           fsp_str_dbg(fsp),
 193                           (unsigned long)state->in_length,
 194                           (unsigned long)state->in_offset,
 195                           nt_errstr(status)));
 196
 197                 return status;
 198         }
 199
 200         DEBUG(3,("smb2: %s, file %s, "
 201                 "length=%lu offset=%lu wrote=%lu\n",
 202                 fsp_fnum_dbg(fsp),
 203                 fsp_str_dbg(fsp),
 204                 (unsigned long)state->in_length,
 205                 (unsigned long)state->in_offset,
 206                 (unsigned long)nwritten));
 207
 208         if ((nwritten == 0) && (state->in_length != 0)) {
 209                 DEBUG(5,("smb2: write [%s] disk full\n",
 210                         fsp_str_dbg(fsp)));
 211                 return NT_STATUS_DISK_FULL;
 212         }
 213
 214         if (do_sync) {
 215                 status = sync_file(fsp->conn, fsp, state->write_through);
 216                 if (!NT_STATUS_IS_OK(status)) {
 217                         DEBUG(5,("smb2: sync_file for %s returned %s\n",
 218                                  fsp_str_dbg(fsp),
 219                                  nt_errstr(status)));
 220                         return status;
 221                 }
 222         }
 223
 224         state->out_count = nwritten;
 225
 226         return NT_STATUS_OK;
 227 }
 228
 229 NTSTATUS smb2_write_complete(struct tevent_req *req, ssize_t nwritten, int err)
 230 {
 231         return smb2_write_complete_internal(req, nwritten, err, true);
 232 }
 233
 234 NTSTATUS smb2_write_complete_nosync(struct tevent_req *req, ssize_t nwritten,
 235                                     int err)
 236 {
 237         return smb2_write_complete_internal(req, nwritten, err, false);
 238 }
 239
 240
 241 static bool smbd_smb2_write_cancel(struct tevent_req *req)
 242 {
 243         struct smbd_smb2_write_state *state =
 244                 tevent_req_data(req,
 245                 struct smbd_smb2_write_state);
 246
 247         state->smb2req->cancelled = true;
 248
 249         return cancel_smb2_aio(state->smbreq);
 250 }
 251
 252 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
 253                                                struct tevent_context *ev,
 254                                                struct smbd_smb2_request *smb2req,
 255                                                struct files_struct *fsp,
 256                                                uint32_t in_smbpid,
 257                                                DATA_BLOB in_data,
 258                                                uint64_t in_offset,
 259                                                uint32_t in_flags)
 260 {
 261         NTSTATUS status;
 262         struct tevent_req *req = NULL;
 263         struct smbd_smb2_write_state *state = NULL;
 264         struct smb_request *smbreq = NULL;
 265         connection_struct *conn = smb2req->tcon->compat;
 266         ssize_t nwritten;
 267         struct lock_struct lock;
 268
 269         req = tevent_req_create(mem_ctx, &state,
 270                                 struct smbd_smb2_write_state);
 271         if (req == NULL) {
 272                 return NULL;
 273         }
 274         state->smb2req = smb2req;
 275         if (in_flags & SMB2_WRITEFLAG_WRITE_THROUGH) {
 276                 state->write_through = true;
 277         }
 278         state->in_length = in_data.length;
 279         state->out_count = 0;
 280
 281         DEBUG(10,("smbd_smb2_write: %s - %s\n",
 282                   fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));
 283
 284         smbreq = smbd_smb2_fake_smb_request(smb2req);
 285         if (tevent_req_nomem(smbreq, req)) {
 286                 return tevent_req_post(req, ev);
 287         }
 288         state->smbreq = smbreq;
 289
 290         state->fsp = fsp;
 291
 292         if (IS_IPC(smbreq->conn)) {
 293                 struct tevent_req *subreq = NULL;
 294
 295                 if (!fsp_is_np(fsp)) {
 296                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 297                         return tevent_req_post(req, ev);
 298                 }
 299
 300                 subreq = np_write_send(state, ev,
 301                                        fsp->fake_file_handle,
 302                                        in_data.data,
 303                                        in_data.length);
 304                 if (tevent_req_nomem(subreq, req)) {
 305                         return tevent_req_post(req, ev);
 306                 }
 307                 tevent_req_set_callback(subreq,
 308                                         smbd_smb2_write_pipe_done,
 309                                         req);
 310                 return req;
 311         }
 312
 313         if (!CHECK_WRITE(fsp)) {
 314                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 315                 return tevent_req_post(req, ev);
 316         }
 317
 318         /* Try and do an asynchronous write. */
 319         status = schedule_aio_smb2_write(conn,
 320                                         smbreq,
 321                                         fsp,
 322                                         in_offset,
 323                                         in_data,
 324                                         state->write_through);
 325
 326         if (NT_STATUS_IS_OK(status)) {
 327                 /*
 328                  * Doing an async write, allow this
 329                  * request to be canceled
 330                  */
 331                 tevent_req_set_cancel_fn(req, smbd_smb2_write_cancel);
 332                 return req;
 333         }
 334
 335         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 336                 /* Real error in setting up aio. Fail. */
 337                 tevent_req_nterror(req, status);
 338                 return tevent_req_post(req, ev);
 339         }
 340
 341         /* Fallback to synchronous. */
 342         init_strict_lock_struct(fsp,
 343                                 fsp->op->global->open_persistent_id,
 344                                 in_offset,
 345                                 in_data.length,
 346                                 WRITE_LOCK,
 347                                 &lock);
 348
 349         if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
 350                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
 351                 return tevent_req_post(req, ev);
 352         }
 353
 354         nwritten = write_file(smbreq, fsp,
 355                               (const char *)in_data.data,
 356                               in_offset,
 357                               in_data.length);
 358
 359         status = smb2_write_complete(req, nwritten, errno);
 360
 361         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 362
 363         DEBUG(10,("smb2: write on "
 364                 "file %s, offset %.0f, requested %u, written = %u\n",
 365                 fsp_str_dbg(fsp),
 366                 (double)in_offset,
 367                 (unsigned int)in_data.length,
 368                 (unsigned int)nwritten ));
 369
 370         if (!NT_STATUS_IS_OK(status)) {
 371                 tevent_req_nterror(req, status);
 372         } else {
 373                 /* Success. */
 374                 tevent_req_done(req);
 375         }
 376
 377         return tevent_req_post(req, ev);
 378 }
 379
 380 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq)
 381 {
 382         struct tevent_req *req = tevent_req_callback_data(subreq,
 383                                  struct tevent_req);
 384         struct smbd_smb2_write_state *state = tevent_req_data(req,
 385                                               struct smbd_smb2_write_state);
 386         NTSTATUS status;
 387         ssize_t nwritten = -1;
 388
 389         status = np_write_recv(subreq, &nwritten);
 390         TALLOC_FREE(subreq);
 391         if (!NT_STATUS_IS_OK(status)) {
 392                 NTSTATUS old = status;
 393                 status = nt_status_np_pipe(old);
 394                 tevent_req_nterror(req, status);
 395                 return;
 396         }
 397
 398         if ((nwritten == 0 && state->in_length != 0) || (nwritten < 0)) {
 399                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 400                 return;
 401         }
 402
 403         state->out_count = nwritten;
 404
 405         tevent_req_done(req);
 406 }
 407
 408 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
 409                                      uint32_t *out_count)
 410 {
 411         NTSTATUS status;
 412         struct smbd_smb2_write_state *state = tevent_req_data(req,
 413                                               struct smbd_smb2_write_state);
 414
 415         if (tevent_req_is_nterror(req, &status)) {
 416                 tevent_req_received(req);
 417                 return status;
 418         }
 419
 420         *out_count = state->out_count;
 421
 422         tevent_req_received(req);
 423         return NT_STATUS_OK;
 424 }