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/globals.h"
  23 #include "../libcli/smb/smb_common.h"
  24
  25 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
  26                                                struct tevent_context *ev,
  27                                                struct smbd_smb2_request *smb2req,
  28                                                uint32_t in_smbpid,
  29                                                uint64_t in_file_id_volatile,
  30                                                DATA_BLOB in_data,
  31                                                uint64_t in_offset,
  32                                                uint32_t in_flags);
  33 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
  34                                      uint32_t *out_count);
  35
  36 static void smbd_smb2_request_write_done(struct tevent_req *subreq);
  37 NTSTATUS smbd_smb2_request_process_write(struct smbd_smb2_request *req)
  38 {
  39         const uint8_t *inhdr;
  40         const uint8_t *inbody;
  41         int i = req->current_idx;
  42         size_t expected_body_size = 0x31;
  43         size_t body_size;
  44         uint32_t in_smbpid;
  45         uint16_t in_data_offset;
  46         uint32_t in_data_length;
  47         DATA_BLOB in_data_buffer;
  48         uint64_t in_offset;
  49         uint64_t in_file_id_persistent;
  50         uint64_t in_file_id_volatile;
  51         uint32_t in_flags;
  52         struct tevent_req *subreq;
  53
  54         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
  55         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
  56                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  57         }
  58
  59         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  60
  61         body_size = SVAL(inbody, 0x00);
  62         if (body_size != expected_body_size) {
  63                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  64         }
  65
  66         in_smbpid = IVAL(inhdr, SMB2_HDR_PID);
  67
  68         in_data_offset          = SVAL(inbody, 0x02);
  69         in_data_length          = IVAL(inbody, 0x04);
  70         in_offset               = BVAL(inbody, 0x08);
  71         in_file_id_persistent   = BVAL(inbody, 0x10);
  72         in_file_id_volatile     = BVAL(inbody, 0x18);
  73         in_flags                = IVAL(inbody, 0x2C);
  74
  75         if (in_data_offset != (SMB2_HDR_BODY + (body_size & 0xFFFFFFFE))) {
  76                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  77         }
  78
  79         if (in_data_length > req->in.vector[i+2].iov_len) {
  80                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  81         }
  82
  83         /* check the max write size */
  84         if (in_data_length > lp_smb2_max_write()) {
  85                 /* This is a warning. */
  86                 DEBUG(2,("smbd_smb2_request_process_write : "
  87                         "client ignored max write :%s: 0x%08X: 0x%08X\n",
  88                         __location__, in_data_length, lp_smb2_max_write()));
  89 #if 0
  90                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  91 #endif
  92         }
  93
  94         in_data_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
  95         in_data_buffer.length = in_data_length;
  96
  97         if (req->compat_chain_fsp) {
  98                 /* skip check */
  99         } else if (in_file_id_persistent != in_file_id_volatile) {
 100                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
 101         }
 102
 103         subreq = smbd_smb2_write_send(req,
 104                                       req->sconn->smb2.event_ctx,
 105                                       req,
 106                                       in_smbpid,
 107                                       in_file_id_volatile,
 108                                       in_data_buffer,
 109                                       in_offset,
 110                                       in_flags);
 111         if (subreq == NULL) {
 112                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 113         }
 114         tevent_req_set_callback(subreq, smbd_smb2_request_write_done, req);
 115
 116         return smbd_smb2_request_pending_queue(req, subreq);
 117 }
 118
 119 static void smbd_smb2_request_write_done(struct tevent_req *subreq)
 120 {
 121         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 122                                         struct smbd_smb2_request);
 123         int i = req->current_idx;
 124         uint8_t *outhdr;
 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         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 144
 145         outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
 146         if (outbody.data == NULL) {
 147                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 148                 if (!NT_STATUS_IS_OK(error)) {
 149                         smbd_server_connection_terminate(req->sconn,
 150                                                          nt_errstr(error));
 151                         return;
 152                 }
 153                 return;
 154         }
 155
 156         SSVAL(outbody.data, 0x00, 0x10 + 1);    /* struct size */
 157         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 158         SIVAL(outbody.data, 0x04, out_count);   /* count */
 159         SIVAL(outbody.data, 0x08, 0);           /* remaining */
 160         SSVAL(outbody.data, 0x0C, 0);           /* write channel info offset */
 161         SSVAL(outbody.data, 0x0E, 0);           /* write channel info length */
 162
 163         outdyn = data_blob_const(NULL, 0);
 164
 165         error = smbd_smb2_request_done(req, outbody, &outdyn);
 166         if (!NT_STATUS_IS_OK(error)) {
 167                 smbd_server_connection_terminate(req->sconn, nt_errstr(error));
 168                 return;
 169         }
 170 }
 171
 172 struct smbd_smb2_write_state {
 173         struct smbd_smb2_request *smb2req;
 174         files_struct *fsp;
 175         bool write_through;
 176         uint32_t in_length;
 177         uint64_t in_offset;
 178         uint32_t out_count;
 179 };
 180
 181 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq);
 182
 183 NTSTATUS smb2_write_complete(struct tevent_req *req, ssize_t nwritten, int err)
 184 {
 185         NTSTATUS status;
 186         struct smbd_smb2_write_state *state = tevent_req_data(req,
 187                                         struct smbd_smb2_write_state);
 188         files_struct *fsp = state->fsp;
 189
 190         DEBUG(3,("smb2: fnum=[%d/%s] "
 191                 "length=%lu offset=%lu wrote=%lu\n",
 192                 fsp->fnum,
 193                 fsp_str_dbg(fsp),
 194                 (unsigned long)state->in_length,
 195                 (unsigned long)state->in_offset,
 196                 (unsigned long)nwritten));
 197
 198         if (nwritten == -1) {
 199                 return map_nt_error_from_unix(err);
 200         }
 201
 202         if ((nwritten == 0) && (state->in_length != 0)) {
 203                 DEBUG(5,("smb2: write [%s] disk full\n",
 204                         fsp_str_dbg(fsp)));
 205                 return NT_STATUS_DISK_FULL;
 206         }
 207
 208         status = sync_file(fsp->conn, fsp, state->write_through);
 209         if (!NT_STATUS_IS_OK(status)) {
 210                 DEBUG(5,("smb2: sync_file for %s returned %s\n",
 211                         fsp_str_dbg(fsp),
 212                         nt_errstr(status)));
 213                 return status;
 214         }
 215
 216         state->out_count = nwritten;
 217
 218         return NT_STATUS_OK;
 219 }
 220
 221 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
 222                                                struct tevent_context *ev,
 223                                                struct smbd_smb2_request *smb2req,
 224                                                uint32_t in_smbpid,
 225                                                uint64_t in_file_id_volatile,
 226                                                DATA_BLOB in_data,
 227                                                uint64_t in_offset,
 228                                                uint32_t in_flags)
 229 {
 230         NTSTATUS status;
 231         struct tevent_req *req = NULL;
 232         struct smbd_smb2_write_state *state = NULL;
 233         struct smb_request *smbreq = NULL;
 234         connection_struct *conn = smb2req->tcon->compat_conn;
 235         files_struct *fsp = NULL;
 236         ssize_t nwritten;
 237         struct lock_struct lock;
 238
 239         req = tevent_req_create(mem_ctx, &state,
 240                                 struct smbd_smb2_write_state);
 241         if (req == NULL) {
 242                 return NULL;
 243         }
 244         state->smb2req = smb2req;
 245         if (in_flags & 0x00000001) {
 246                 state->write_through = true;
 247         }
 248         state->in_length = in_data.length;
 249         state->out_count = 0;
 250
 251         DEBUG(10,("smbd_smb2_write: file_id[0x%016llX]\n",
 252                   (unsigned long long)in_file_id_volatile));
 253
 254         smbreq = smbd_smb2_fake_smb_request(smb2req);
 255         if (tevent_req_nomem(smbreq, req)) {
 256                 return tevent_req_post(req, ev);
 257         }
 258
 259         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 260         if (fsp == NULL) {
 261                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 262                 return tevent_req_post(req, ev);
 263         }
 264         if (conn != fsp->conn) {
 265                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 266                 return tevent_req_post(req, ev);
 267         }
 268         if (smb2req->session->vuid != fsp->vuid) {
 269                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 270                 return tevent_req_post(req, ev);
 271         }
 272
 273         state->fsp = fsp;
 274
 275         if (IS_IPC(smbreq->conn)) {
 276                 struct tevent_req *subreq = NULL;
 277
 278                 if (!fsp_is_np(fsp)) {
 279                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 280                         return tevent_req_post(req, ev);
 281                 }
 282
 283                 subreq = np_write_send(state, smbd_event_context(),
 284                                        fsp->fake_file_handle,
 285                                        in_data.data,
 286                                        in_data.length);
 287                 if (tevent_req_nomem(subreq, req)) {
 288                         return tevent_req_post(req, ev);
 289                 }
 290                 tevent_req_set_callback(subreq,
 291                                         smbd_smb2_write_pipe_done,
 292                                         req);
 293                 return req;
 294         }
 295
 296         if (!CHECK_WRITE(fsp)) {
 297                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 298                 return tevent_req_post(req, ev);
 299         }
 300
 301         /* Try and do an asynchronous write. */
 302         status = schedule_aio_smb2_write(conn,
 303                                         smbreq,
 304                                         fsp,
 305                                         in_offset,
 306                                         in_data,
 307                                         state->write_through);
 308
 309         if (NT_STATUS_IS_OK(status)) {
 310                 /*
 311                  * Doing an async write. Don't
 312                  * send a "gone async" message
 313                  * as we expect this to be less
 314                  * than the client timeout period.
 315                  * JRA. FIXME for offline files..
 316                  * FIXME - add cancel code..
 317                  */
 318                 smb2req->async = true;
 319                 return req;
 320         }
 321
 322         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 323                 /* Real error in setting up aio. Fail. */
 324                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 325                 return tevent_req_post(req, ev);
 326         }
 327
 328         /* Fallback to synchronous. */
 329         init_strict_lock_struct(fsp,
 330                                 in_file_id_volatile,
 331                                 in_offset,
 332                                 in_data.length,
 333                                 WRITE_LOCK,
 334                                 &lock);
 335
 336         if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
 337                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
 338                 return tevent_req_post(req, ev);
 339         }
 340
 341         nwritten = write_file(smbreq, fsp,
 342                               (const char *)in_data.data,
 343                               in_offset,
 344                               in_data.length);
 345
 346         status = smb2_write_complete(req, nwritten, errno);
 347
 348         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 349
 350         DEBUG(10,("smb2: write on "
 351                 "file %s, offset %.0f, requested %u, written = %u\n",
 352                 fsp_str_dbg(fsp),
 353                 (double)in_offset,
 354                 (unsigned int)in_data.length,
 355                 (unsigned int)nwritten ));
 356
 357         if (!NT_STATUS_IS_OK(status)) {
 358                 tevent_req_nterror(req, status);
 359         } else {
 360                 /* Success. */
 361                 tevent_req_done(req);
 362         }
 363
 364         return tevent_req_post(req, ev);
 365 }
 366
 367 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq)
 368 {
 369         struct tevent_req *req = tevent_req_callback_data(subreq,
 370                                  struct tevent_req);
 371         struct smbd_smb2_write_state *state = tevent_req_data(req,
 372                                               struct smbd_smb2_write_state);
 373         NTSTATUS status;
 374         ssize_t nwritten = -1;
 375
 376         status = np_write_recv(subreq, &nwritten);
 377         TALLOC_FREE(subreq);
 378         if (!NT_STATUS_IS_OK(status)) {
 379                 tevent_req_nterror(req, status);
 380                 return;
 381         }
 382
 383         if ((nwritten == 0 && state->in_length != 0) || (nwritten < 0)) {
 384                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 385                 return;
 386         }
 387
 388         state->out_count = nwritten;
 389
 390         tevent_req_done(req);
 391 }
 392
 393 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
 394                                      uint32_t *out_count)
 395 {
 396         NTSTATUS status;
 397         struct smbd_smb2_write_state *state = tevent_req_data(req,
 398                                               struct smbd_smb2_write_state);
 399
 400         if (tevent_req_is_nterror(req, &status)) {
 401                 tevent_req_received(req);
 402                 return status;
 403         }
 404
 405         *out_count = state->out_count;
 406
 407         tevent_req_received(req);
 408         return NT_STATUS_OK;
 409 }