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                                                uint32_t in_smbpid,
  32                                                uint64_t in_file_id_volatile,
  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         const uint8_t *inhdr;
  43         const uint8_t *inbody;
  44         int i = req->current_idx;
  45         size_t expected_body_size = 0x31;
  46         size_t body_size;
  47         uint32_t in_smbpid;
  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         uint32_t in_flags;
  55         struct tevent_req *subreq;
  56
  57         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
  58         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
  59                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  60         }
  61
  62         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  63
  64         body_size = SVAL(inbody, 0x00);
  65         if (body_size != expected_body_size) {
  66                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  67         }
  68
  69         in_smbpid = IVAL(inhdr, SMB2_HDR_PID);
  70
  71         in_data_offset          = SVAL(inbody, 0x02);
  72         in_data_length          = IVAL(inbody, 0x04);
  73         in_offset               = BVAL(inbody, 0x08);
  74         in_file_id_persistent   = BVAL(inbody, 0x10);
  75         in_file_id_volatile     = BVAL(inbody, 0x18);
  76         in_flags                = IVAL(inbody, 0x2C);
  77
  78         if (in_data_offset != (SMB2_HDR_BODY + (body_size & 0xFFFFFFFE))) {
  79                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  80         }
  81
  82         if (in_data_length > req->in.vector[i+2].iov_len) {
  83                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  84         }
  85
  86         /* check the max write size */
  87         if (in_data_length > lp_smb2_max_write()) {
  88                 /* This is a warning. */
  89                 DEBUG(2,("smbd_smb2_request_process_write : "
  90                         "client ignored max write :%s: 0x%08X: 0x%08X\n",
  91                         __location__, in_data_length, lp_smb2_max_write()));
  92 #if 0
  93                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  94 #endif
  95         }
  96
  97         in_data_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
  98         in_data_buffer.length = in_data_length;
  99
 100         if (req->compat_chain_fsp) {
 101                 /* skip check */
 102         } else if (in_file_id_persistent != in_file_id_volatile) {
 103                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
 104         }
 105
 106         subreq = smbd_smb2_write_send(req,
 107                                       req->sconn->smb2.event_ctx,
 108                                       req,
 109                                       in_smbpid,
 110                                       in_file_id_volatile,
 111                                       in_data_buffer,
 112                                       in_offset,
 113                                       in_flags);
 114         if (subreq == NULL) {
 115                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 116         }
 117         tevent_req_set_callback(subreq, smbd_smb2_request_write_done, req);
 118
 119         return smbd_smb2_request_pending_queue(req, subreq);
 120 }
 121
 122 static void smbd_smb2_request_write_done(struct tevent_req *subreq)
 123 {
 124         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 125                                         struct smbd_smb2_request);
 126         int i = req->current_idx;
 127         uint8_t *outhdr;
 128         DATA_BLOB outbody;
 129         DATA_BLOB outdyn;
 130         uint32_t out_count = 0;
 131         NTSTATUS status;
 132         NTSTATUS error; /* transport error */
 133
 134         status = smbd_smb2_write_recv(subreq, &out_count);
 135         TALLOC_FREE(subreq);
 136         if (!NT_STATUS_IS_OK(status)) {
 137                 error = smbd_smb2_request_error(req, status);
 138                 if (!NT_STATUS_IS_OK(error)) {
 139                         smbd_server_connection_terminate(req->sconn,
 140                                                          nt_errstr(error));
 141                         return;
 142                 }
 143                 return;
 144         }
 145
 146         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 147
 148         outbody = data_blob_talloc(req->out.vector, NULL, 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->sconn,
 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->sconn, nt_errstr(error));
 171                 return;
 172         }
 173 }
 174
 175 struct smbd_smb2_write_state {
 176         struct smbd_smb2_request *smb2req;
 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 NTSTATUS smb2_write_complete(struct tevent_req *req, ssize_t nwritten, int err)
 187 {
 188         NTSTATUS status;
 189         struct smbd_smb2_write_state *state = tevent_req_data(req,
 190                                         struct smbd_smb2_write_state);
 191         files_struct *fsp = state->fsp;
 192
 193         DEBUG(3,("smb2: fnum=[%d/%s] "
 194                 "length=%lu offset=%lu wrote=%lu\n",
 195                 fsp->fnum,
 196                 fsp_str_dbg(fsp),
 197                 (unsigned long)state->in_length,
 198                 (unsigned long)state->in_offset,
 199                 (unsigned long)nwritten));
 200
 201         if (nwritten == -1) {
 202                 return map_nt_error_from_unix(err);
 203         }
 204
 205         if ((nwritten == 0) && (state->in_length != 0)) {
 206                 DEBUG(5,("smb2: write [%s] disk full\n",
 207                         fsp_str_dbg(fsp)));
 208                 return NT_STATUS_DISK_FULL;
 209         }
 210
 211         status = sync_file(fsp->conn, fsp, state->write_through);
 212         if (!NT_STATUS_IS_OK(status)) {
 213                 DEBUG(5,("smb2: sync_file for %s returned %s\n",
 214                         fsp_str_dbg(fsp),
 215                         nt_errstr(status)));
 216                 return status;
 217         }
 218
 219         state->out_count = nwritten;
 220
 221         return NT_STATUS_OK;
 222 }
 223
 224 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
 225                                                struct tevent_context *ev,
 226                                                struct smbd_smb2_request *smb2req,
 227                                                uint32_t in_smbpid,
 228                                                uint64_t in_file_id_volatile,
 229                                                DATA_BLOB in_data,
 230                                                uint64_t in_offset,
 231                                                uint32_t in_flags)
 232 {
 233         NTSTATUS status;
 234         struct tevent_req *req = NULL;
 235         struct smbd_smb2_write_state *state = NULL;
 236         struct smb_request *smbreq = NULL;
 237         connection_struct *conn = smb2req->tcon->compat_conn;
 238         files_struct *fsp = NULL;
 239         ssize_t nwritten;
 240         struct lock_struct lock;
 241
 242         req = tevent_req_create(mem_ctx, &state,
 243                                 struct smbd_smb2_write_state);
 244         if (req == NULL) {
 245                 return NULL;
 246         }
 247         state->smb2req = smb2req;
 248         if (in_flags & 0x00000001) {
 249                 state->write_through = true;
 250         }
 251         state->in_length = in_data.length;
 252         state->out_count = 0;
 253
 254         DEBUG(10,("smbd_smb2_write: file_id[0x%016llX]\n",
 255                   (unsigned long long)in_file_id_volatile));
 256
 257         smbreq = smbd_smb2_fake_smb_request(smb2req);
 258         if (tevent_req_nomem(smbreq, req)) {
 259                 return tevent_req_post(req, ev);
 260         }
 261
 262         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 263         if (fsp == NULL) {
 264                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 265                 return tevent_req_post(req, ev);
 266         }
 267         if (conn != fsp->conn) {
 268                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 269                 return tevent_req_post(req, ev);
 270         }
 271         if (smb2req->session->vuid != fsp->vuid) {
 272                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 273                 return tevent_req_post(req, ev);
 274         }
 275
 276         state->fsp = fsp;
 277
 278         if (IS_IPC(smbreq->conn)) {
 279                 struct tevent_req *subreq = NULL;
 280
 281                 if (!fsp_is_np(fsp)) {
 282                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 283                         return tevent_req_post(req, ev);
 284                 }
 285
 286                 subreq = np_write_send(state, server_event_context(),
 287                                        fsp->fake_file_handle,
 288                                        in_data.data,
 289                                        in_data.length);
 290                 if (tevent_req_nomem(subreq, req)) {
 291                         return tevent_req_post(req, ev);
 292                 }
 293                 tevent_req_set_callback(subreq,
 294                                         smbd_smb2_write_pipe_done,
 295                                         req);
 296                 return req;
 297         }
 298
 299         if (!CHECK_WRITE(fsp)) {
 300                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 301                 return tevent_req_post(req, ev);
 302         }
 303
 304         /* Try and do an asynchronous write. */
 305         status = schedule_aio_smb2_write(conn,
 306                                         smbreq,
 307                                         fsp,
 308                                         in_offset,
 309                                         in_data,
 310                                         state->write_through);
 311
 312         if (NT_STATUS_IS_OK(status)) {
 313                 /*
 314                  * Doing an async write. Don't
 315                  * send a "gone async" message
 316                  * as we expect this to be less
 317                  * than the client timeout period.
 318                  * JRA. FIXME for offline files..
 319                  * FIXME - add cancel code..
 320                  */
 321                 smb2req->async = true;
 322                 return req;
 323         }
 324
 325         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 326                 /* Real error in setting up aio. Fail. */
 327                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 328                 return tevent_req_post(req, ev);
 329         }
 330
 331         /* Fallback to synchronous. */
 332         init_strict_lock_struct(fsp,
 333                                 in_file_id_volatile,
 334                                 in_offset,
 335                                 in_data.length,
 336                                 WRITE_LOCK,
 337                                 &lock);
 338
 339         if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
 340                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
 341                 return tevent_req_post(req, ev);
 342         }
 343
 344         nwritten = write_file(smbreq, fsp,
 345                               (const char *)in_data.data,
 346                               in_offset,
 347                               in_data.length);
 348
 349         status = smb2_write_complete(req, nwritten, errno);
 350
 351         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 352
 353         DEBUG(10,("smb2: write on "
 354                 "file %s, offset %.0f, requested %u, written = %u\n",
 355                 fsp_str_dbg(fsp),
 356                 (double)in_offset,
 357                 (unsigned int)in_data.length,
 358                 (unsigned int)nwritten ));
 359
 360         if (!NT_STATUS_IS_OK(status)) {
 361                 tevent_req_nterror(req, status);
 362         } else {
 363                 /* Success. */
 364                 tevent_req_done(req);
 365         }
 366
 367         return tevent_req_post(req, ev);
 368 }
 369
 370 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq)
 371 {
 372         struct tevent_req *req = tevent_req_callback_data(subreq,
 373                                  struct tevent_req);
 374         struct smbd_smb2_write_state *state = tevent_req_data(req,
 375                                               struct smbd_smb2_write_state);
 376         NTSTATUS status;
 377         ssize_t nwritten = -1;
 378
 379         status = np_write_recv(subreq, &nwritten);
 380         TALLOC_FREE(subreq);
 381         if (!NT_STATUS_IS_OK(status)) {
 382                 tevent_req_nterror(req, status);
 383                 return;
 384         }
 385
 386         if ((nwritten == 0 && state->in_length != 0) || (nwritten < 0)) {
 387                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 388                 return;
 389         }
 390
 391         state->out_count = nwritten;
 392
 393         tevent_req_done(req);
 394 }
 395
 396 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
 397                                      uint32_t *out_count)
 398 {
 399         NTSTATUS status;
 400         struct smbd_smb2_write_state *state = tevent_req_data(req,
 401                                               struct smbd_smb2_write_state);
 402
 403         if (tevent_req_is_nterror(req, &status)) {
 404                 tevent_req_received(req);
 405                 return status;
 406         }
 407
 408         *out_count = state->out_count;
 409
 410         tevent_req_received(req);
 411         return NT_STATUS_OK;
 412 }