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
  26 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
  27                                                struct tevent_context *ev,
  28                                                struct smbd_smb2_request *smb2req,
  29                                                uint32_t in_smbpid,
  30                                                uint64_t in_file_id_volatile,
  31                                                DATA_BLOB in_data,
  32                                                uint64_t in_offset,
  33                                                uint32_t in_flags);
  34 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
  35                                      uint32_t *out_count);
  36
  37 static void smbd_smb2_request_write_done(struct tevent_req *subreq);
  38 NTSTATUS smbd_smb2_request_process_write(struct smbd_smb2_request *req)
  39 {
  40         const uint8_t *inhdr;
  41         const uint8_t *inbody;
  42         int i = req->current_idx;
  43         size_t expected_body_size = 0x31;
  44         size_t body_size;
  45         uint32_t in_smbpid;
  46         uint16_t in_data_offset;
  47         uint32_t in_data_length;
  48         DATA_BLOB in_data_buffer;
  49         uint64_t in_offset;
  50         uint64_t in_file_id_persistent;
  51         uint64_t in_file_id_volatile;
  52         uint32_t in_flags;
  53         struct tevent_req *subreq;
  54
  55         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
  56         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
  57                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  58         }
  59
  60         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  61
  62         body_size = SVAL(inbody, 0x00);
  63         if (body_size != expected_body_size) {
  64                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  65         }
  66
  67         in_smbpid = IVAL(inhdr, SMB2_HDR_PID);
  68
  69         in_data_offset          = SVAL(inbody, 0x02);
  70         in_data_length          = IVAL(inbody, 0x04);
  71         in_offset               = BVAL(inbody, 0x08);
  72         in_file_id_persistent   = BVAL(inbody, 0x10);
  73         in_file_id_volatile     = BVAL(inbody, 0x18);
  74         in_flags                = IVAL(inbody, 0x2C);
  75
  76         if (in_data_offset != (SMB2_HDR_BODY + (body_size & 0xFFFFFFFE))) {
  77                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  78         }
  79
  80         if (in_data_length > req->in.vector[i+2].iov_len) {
  81                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  82         }
  83
  84         /* check the max write size */
  85         if (in_data_length > lp_smb2_max_write()) {
  86                 /* This is a warning. */
  87                 DEBUG(2,("smbd_smb2_request_process_write : "
  88                         "client ignored max write :%s: 0x%08X: 0x%08X\n",
  89                         __location__, in_data_length, lp_smb2_max_write()));
  90 #if 0
  91                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  92 #endif
  93         }
  94
  95         in_data_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
  96         in_data_buffer.length = in_data_length;
  97
  98         if (req->compat_chain_fsp) {
  99                 /* skip check */
 100         } else if (in_file_id_persistent != in_file_id_volatile) {
 101                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
 102         }
 103
 104         subreq = smbd_smb2_write_send(req,
 105                                       req->sconn->smb2.event_ctx,
 106                                       req,
 107                                       in_smbpid,
 108                                       in_file_id_volatile,
 109                                       in_data_buffer,
 110                                       in_offset,
 111                                       in_flags);
 112         if (subreq == NULL) {
 113                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 114         }
 115         tevent_req_set_callback(subreq, smbd_smb2_request_write_done, req);
 116
 117         return smbd_smb2_request_pending_queue(req, subreq);
 118 }
 119
 120 static void smbd_smb2_request_write_done(struct tevent_req *subreq)
 121 {
 122         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 123                                         struct smbd_smb2_request);
 124         int i = req->current_idx;
 125         uint8_t *outhdr;
 126         DATA_BLOB outbody;
 127         DATA_BLOB outdyn;
 128         uint32_t out_count = 0;
 129         NTSTATUS status;
 130         NTSTATUS error; /* transport error */
 131
 132         status = smbd_smb2_write_recv(subreq, &out_count);
 133         TALLOC_FREE(subreq);
 134         if (!NT_STATUS_IS_OK(status)) {
 135                 error = smbd_smb2_request_error(req, status);
 136                 if (!NT_STATUS_IS_OK(error)) {
 137                         smbd_server_connection_terminate(req->sconn,
 138                                                          nt_errstr(error));
 139                         return;
 140                 }
 141                 return;
 142         }
 143
 144         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 145
 146         outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
 147         if (outbody.data == NULL) {
 148                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 149                 if (!NT_STATUS_IS_OK(error)) {
 150                         smbd_server_connection_terminate(req->sconn,
 151                                                          nt_errstr(error));
 152                         return;
 153                 }
 154                 return;
 155         }
 156
 157         SSVAL(outbody.data, 0x00, 0x10 + 1);    /* struct size */
 158         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 159         SIVAL(outbody.data, 0x04, out_count);   /* count */
 160         SIVAL(outbody.data, 0x08, 0);           /* remaining */
 161         SSVAL(outbody.data, 0x0C, 0);           /* write channel info offset */
 162         SSVAL(outbody.data, 0x0E, 0);           /* write channel info length */
 163
 164         outdyn = data_blob_const(NULL, 0);
 165
 166         error = smbd_smb2_request_done(req, outbody, &outdyn);
 167         if (!NT_STATUS_IS_OK(error)) {
 168                 smbd_server_connection_terminate(req->sconn, nt_errstr(error));
 169                 return;
 170         }
 171 }
 172
 173 struct smbd_smb2_write_state {
 174         struct smbd_smb2_request *smb2req;
 175         files_struct *fsp;
 176         bool write_through;
 177         uint32_t in_length;
 178         uint64_t in_offset;
 179         uint32_t out_count;
 180 };
 181
 182 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq);
 183
 184 NTSTATUS smb2_write_complete(struct tevent_req *req, ssize_t nwritten, int err)
 185 {
 186         NTSTATUS status;
 187         struct smbd_smb2_write_state *state = tevent_req_data(req,
 188                                         struct smbd_smb2_write_state);
 189         files_struct *fsp = state->fsp;
 190
 191         DEBUG(3,("smb2: fnum=[%d/%s] "
 192                 "length=%lu offset=%lu wrote=%lu\n",
 193                 fsp->fnum,
 194                 fsp_str_dbg(fsp),
 195                 (unsigned long)state->in_length,
 196                 (unsigned long)state->in_offset,
 197                 (unsigned long)nwritten));
 198
 199         if (nwritten == -1) {
 200                 return map_nt_error_from_unix(err);
 201         }
 202
 203         if ((nwritten == 0) && (state->in_length != 0)) {
 204                 DEBUG(5,("smb2: write [%s] disk full\n",
 205                         fsp_str_dbg(fsp)));
 206                 return NT_STATUS_DISK_FULL;
 207         }
 208
 209         status = sync_file(fsp->conn, fsp, state->write_through);
 210         if (!NT_STATUS_IS_OK(status)) {
 211                 DEBUG(5,("smb2: sync_file for %s returned %s\n",
 212                         fsp_str_dbg(fsp),
 213                         nt_errstr(status)));
 214                 return status;
 215         }
 216
 217         state->out_count = nwritten;
 218
 219         return NT_STATUS_OK;
 220 }
 221
 222 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
 223                                                struct tevent_context *ev,
 224                                                struct smbd_smb2_request *smb2req,
 225                                                uint32_t in_smbpid,
 226                                                uint64_t in_file_id_volatile,
 227                                                DATA_BLOB in_data,
 228                                                uint64_t in_offset,
 229                                                uint32_t in_flags)
 230 {
 231         NTSTATUS status;
 232         struct tevent_req *req = NULL;
 233         struct smbd_smb2_write_state *state = NULL;
 234         struct smb_request *smbreq = NULL;
 235         connection_struct *conn = smb2req->tcon->compat_conn;
 236         files_struct *fsp = NULL;
 237         ssize_t nwritten;
 238         struct lock_struct lock;
 239
 240         req = tevent_req_create(mem_ctx, &state,
 241                                 struct smbd_smb2_write_state);
 242         if (req == NULL) {
 243                 return NULL;
 244         }
 245         state->smb2req = smb2req;
 246         if (in_flags & 0x00000001) {
 247                 state->write_through = true;
 248         }
 249         state->in_length = in_data.length;
 250         state->out_count = 0;
 251
 252         DEBUG(10,("smbd_smb2_write: file_id[0x%016llX]\n",
 253                   (unsigned long long)in_file_id_volatile));
 254
 255         smbreq = smbd_smb2_fake_smb_request(smb2req);
 256         if (tevent_req_nomem(smbreq, req)) {
 257                 return tevent_req_post(req, ev);
 258         }
 259
 260         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 261         if (fsp == NULL) {
 262                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 263                 return tevent_req_post(req, ev);
 264         }
 265         if (conn != fsp->conn) {
 266                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 267                 return tevent_req_post(req, ev);
 268         }
 269         if (smb2req->session->vuid != fsp->vuid) {
 270                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 271                 return tevent_req_post(req, ev);
 272         }
 273
 274         state->fsp = fsp;
 275
 276         if (IS_IPC(smbreq->conn)) {
 277                 struct tevent_req *subreq = NULL;
 278
 279                 if (!fsp_is_np(fsp)) {
 280                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 281                         return tevent_req_post(req, ev);
 282                 }
 283
 284                 subreq = np_write_send(state, smbd_event_context(),
 285                                        fsp->fake_file_handle,
 286                                        in_data.data,
 287                                        in_data.length);
 288                 if (tevent_req_nomem(subreq, req)) {
 289                         return tevent_req_post(req, ev);
 290                 }
 291                 tevent_req_set_callback(subreq,
 292                                         smbd_smb2_write_pipe_done,
 293                                         req);
 294                 return req;
 295         }
 296
 297         if (!CHECK_WRITE(fsp)) {
 298                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 299                 return tevent_req_post(req, ev);
 300         }
 301
 302         /* Try and do an asynchronous write. */
 303         status = schedule_aio_smb2_write(conn,
 304                                         smbreq,
 305                                         fsp,
 306                                         in_offset,
 307                                         in_data,
 308                                         state->write_through);
 309
 310         if (NT_STATUS_IS_OK(status)) {
 311                 /*
 312                  * Doing an async write. Don't
 313                  * send a "gone async" message
 314                  * as we expect this to be less
 315                  * than the client timeout period.
 316                  * JRA. FIXME for offline files..
 317                  * FIXME - add cancel code..
 318                  */
 319                 smb2req->async = true;
 320                 return req;
 321         }
 322
 323         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 324                 /* Real error in setting up aio. Fail. */
 325                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 326                 return tevent_req_post(req, ev);
 327         }
 328
 329         /* Fallback to synchronous. */
 330         init_strict_lock_struct(fsp,
 331                                 in_file_id_volatile,
 332                                 in_offset,
 333                                 in_data.length,
 334                                 WRITE_LOCK,
 335                                 &lock);
 336
 337         if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
 338                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
 339                 return tevent_req_post(req, ev);
 340         }
 341
 342         nwritten = write_file(smbreq, fsp,
 343                               (const char *)in_data.data,
 344                               in_offset,
 345                               in_data.length);
 346
 347         status = smb2_write_complete(req, nwritten, errno);
 348
 349         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 350
 351         DEBUG(10,("smb2: write on "
 352                 "file %s, offset %.0f, requested %u, written = %u\n",
 353                 fsp_str_dbg(fsp),
 354                 (double)in_offset,
 355                 (unsigned int)in_data.length,
 356                 (unsigned int)nwritten ));
 357
 358         if (!NT_STATUS_IS_OK(status)) {
 359                 tevent_req_nterror(req, status);
 360         } else {
 361                 /* Success. */
 362                 tevent_req_done(req);
 363         }
 364
 365         return tevent_req_post(req, ev);
 366 }
 367
 368 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq)
 369 {
 370         struct tevent_req *req = tevent_req_callback_data(subreq,
 371                                  struct tevent_req);
 372         struct smbd_smb2_write_state *state = tevent_req_data(req,
 373                                               struct smbd_smb2_write_state);
 374         NTSTATUS status;
 375         ssize_t nwritten = -1;
 376
 377         status = np_write_recv(subreq, &nwritten);
 378         TALLOC_FREE(subreq);
 379         if (!NT_STATUS_IS_OK(status)) {
 380                 tevent_req_nterror(req, status);
 381                 return;
 382         }
 383
 384         if ((nwritten == 0 && state->in_length != 0) || (nwritten < 0)) {
 385                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 386                 return;
 387         }
 388
 389         state->out_count = nwritten;
 390
 391         tevent_req_done(req);
 392 }
 393
 394 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
 395                                      uint32_t *out_count)
 396 {
 397         NTSTATUS status;
 398         struct smbd_smb2_write_state *state = tevent_req_data(req,
 399                                               struct smbd_smb2_write_state);
 400
 401         if (tevent_req_is_nterror(req, &status)) {
 402                 tevent_req_received(req);
 403                 return status;
 404         }
 405
 406         *out_count = state->out_count;
 407
 408         tevent_req_received(req);
 409         return NT_STATUS_OK;
 410 }