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 #include "libcli/security/security.h"
  28
  29 #undef DBGC_CLASS
  30 #define DBGC_CLASS DBGC_SMB2
  31
  32 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
  33                                                struct tevent_context *ev,
  34                                                struct smbd_smb2_request *smb2req,
  35                                                struct files_struct *in_fsp,
  36                                                DATA_BLOB in_data,
  37                                                uint64_t in_offset,
  38                                                uint32_t in_flags);
  39 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
  40                                      uint32_t *out_count);
  41
  42 static void smbd_smb2_request_write_done(struct tevent_req *subreq);
  43 NTSTATUS smbd_smb2_request_process_write(struct smbd_smb2_request *req)
  44 {
  45         struct smbXsrv_connection *xconn = req->xconn;
  46         NTSTATUS status;
  47         const uint8_t *inbody;
  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         struct files_struct *in_fsp;
  55         uint32_t in_flags;
  56         size_t in_dyn_len = 0;
  57         uint8_t *in_dyn_ptr = NULL;
  58         struct tevent_req *subreq;
  59
  60         status = smbd_smb2_request_verify_sizes(req, 0x31);
  61         if (!NT_STATUS_IS_OK(status)) {
  62                 return smbd_smb2_request_error(req, status);
  63         }
  64         inbody = SMBD_SMB2_IN_BODY_PTR(req);
  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 + SMBD_SMB2_IN_BODY_LEN(req))) {
  74                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  75         }
  76
  77         if (req->smb1req != NULL && req->smb1req->unread_bytes > 0) {
  78                 in_dyn_ptr = NULL;
  79                 in_dyn_len = req->smb1req->unread_bytes;
  80         } else {
  81                 in_dyn_ptr = SMBD_SMB2_IN_DYN_PTR(req);
  82                 in_dyn_len = SMBD_SMB2_IN_DYN_LEN(req);
  83         }
  84
  85         if (in_data_length > in_dyn_len) {
  86                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  87         }
  88
  89         /* check the max write size */
  90         if (in_data_length > xconn->smb2.server.max_write) {
  91                 DEBUG(2,("smbd_smb2_request_process_write : "
  92                         "client ignored max write :%s: 0x%08X: 0x%08X\n",
  93                         __location__, in_data_length, xconn->smb2.server.max_write));
  94                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  95         }
  96
  97         /*
  98          * Note: that in_dyn_ptr is NULL for the recvfile case.
  99          */
 100         in_data_buffer.data = in_dyn_ptr;
 101         in_data_buffer.length = in_data_length;
 102
 103         status = smbd_smb2_request_verify_creditcharge(req, in_data_length);
 104         if (!NT_STATUS_IS_OK(status)) {
 105                 return smbd_smb2_request_error(req, status);
 106         }
 107
 108         in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile);
 109         if (in_fsp == NULL) {
 110                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
 111         }
 112
 113         subreq = smbd_smb2_write_send(req, req->sconn->ev_ctx,
 114                                       req, in_fsp,
 115                                       in_data_buffer,
 116                                       in_offset,
 117                                       in_flags);
 118         if (subreq == NULL) {
 119                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 120         }
 121         tevent_req_set_callback(subreq, smbd_smb2_request_write_done, req);
 122
 123         return smbd_smb2_request_pending_queue(req, subreq, 500);
 124 }
 125
 126 static void smbd_smb2_request_write_done(struct tevent_req *subreq)
 127 {
 128         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 129                                         struct smbd_smb2_request);
 130         DATA_BLOB outbody;
 131         DATA_BLOB outdyn;
 132         uint32_t out_count = 0;
 133         NTSTATUS status;
 134         NTSTATUS error; /* transport error */
 135
 136         status = smbd_smb2_write_recv(subreq, &out_count);
 137         TALLOC_FREE(subreq);
 138         if (!NT_STATUS_IS_OK(status)) {
 139                 error = smbd_smb2_request_error(req, status);
 140                 if (!NT_STATUS_IS_OK(error)) {
 141                         smbd_server_connection_terminate(req->xconn,
 142                                                          nt_errstr(error));
 143                         return;
 144                 }
 145                 return;
 146         }
 147
 148         outbody = smbd_smb2_generate_outbody(req, 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->xconn,
 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->xconn, nt_errstr(error));
 171                 return;
 172         }
 173 }
 174
 175 struct smbd_smb2_write_state {
 176         struct smbd_smb2_request *smb2req;
 177         struct smb_request *smbreq;
 178         files_struct *fsp;
 179         bool write_through;
 180         uint32_t in_length;
 181         uint64_t in_offset;
 182         uint32_t out_count;
 183 };
 184
 185 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq);
 186
 187 static NTSTATUS smb2_write_complete_internal(struct tevent_req *req,
 188                                              ssize_t nwritten, int err,
 189                                              bool do_sync)
 190 {
 191         NTSTATUS status;
 192         struct smbd_smb2_write_state *state = tevent_req_data(req,
 193                                         struct smbd_smb2_write_state);
 194         files_struct *fsp = state->fsp;
 195
 196         if (nwritten == -1) {
 197                 if (err == EOVERFLOW && fsp_is_alternate_stream(fsp)) {
 198                         status = NT_STATUS_FILE_SYSTEM_LIMITATION;
 199                 } else {
 200                         status = map_nt_error_from_unix(err);
 201                 }
 202
 203                 DEBUG(2, ("smb2_write failed: %s, file %s, "
 204                           "length=%lu offset=%lu nwritten=-1: %s\n",
 205                           fsp_fnum_dbg(fsp),
 206                           fsp_str_dbg(fsp),
 207                           (unsigned long)state->in_length,
 208                           (unsigned long)state->in_offset,
 209                           nt_errstr(status)));
 210
 211                 return status;
 212         }
 213
 214         DEBUG(3,("smb2: %s, file %s, "
 215                 "length=%lu offset=%lu wrote=%lu\n",
 216                 fsp_fnum_dbg(fsp),
 217                 fsp_str_dbg(fsp),
 218                 (unsigned long)state->in_length,
 219                 (unsigned long)state->in_offset,
 220                 (unsigned long)nwritten));
 221
 222         if ((nwritten == 0) && (state->in_length != 0)) {
 223                 DEBUG(5,("smb2: write [%s] disk full\n",
 224                         fsp_str_dbg(fsp)));
 225                 return NT_STATUS_DISK_FULL;
 226         }
 227
 228         if (do_sync) {
 229                 status = sync_file(fsp->conn, fsp, state->write_through);
 230                 if (!NT_STATUS_IS_OK(status)) {
 231                         DEBUG(5,("smb2: sync_file for %s returned %s\n",
 232                                  fsp_str_dbg(fsp),
 233                                  nt_errstr(status)));
 234                         return status;
 235                 }
 236         }
 237
 238         state->out_count = nwritten;
 239
 240         return NT_STATUS_OK;
 241 }
 242
 243 NTSTATUS smb2_write_complete(struct tevent_req *req, ssize_t nwritten, int err)
 244 {
 245         return smb2_write_complete_internal(req, nwritten, err, true);
 246 }
 247
 248 NTSTATUS smb2_write_complete_nosync(struct tevent_req *req, ssize_t nwritten,
 249                                     int err)
 250 {
 251         return smb2_write_complete_internal(req, nwritten, err, false);
 252 }
 253
 254
 255 static bool smbd_smb2_write_cancel(struct tevent_req *req)
 256 {
 257         struct smbd_smb2_write_state *state =
 258                 tevent_req_data(req,
 259                 struct smbd_smb2_write_state);
 260
 261         return cancel_smb2_aio(state->smbreq);
 262 }
 263
 264 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
 265                                                struct tevent_context *ev,
 266                                                struct smbd_smb2_request *smb2req,
 267                                                struct files_struct *fsp,
 268                                                DATA_BLOB in_data,
 269                                                uint64_t in_offset,
 270                                                uint32_t in_flags)
 271 {
 272         NTSTATUS status;
 273         struct tevent_req *req = NULL;
 274         struct smbd_smb2_write_state *state = NULL;
 275         struct smb_request *smbreq = NULL;
 276         connection_struct *conn = smb2req->tcon->compat;
 277         ssize_t nwritten;
 278         struct lock_struct lock;
 279
 280         req = tevent_req_create(mem_ctx, &state,
 281                                 struct smbd_smb2_write_state);
 282         if (req == NULL) {
 283                 return NULL;
 284         }
 285         state->smb2req = smb2req;
 286         if (smb2req->xconn->protocol >= PROTOCOL_SMB3_02) {
 287                 if (in_flags & SMB2_WRITEFLAG_WRITE_UNBUFFERED) {
 288                         state->write_through = true;
 289                 }
 290         }
 291         if (in_flags & SMB2_WRITEFLAG_WRITE_THROUGH) {
 292                 state->write_through = true;
 293         }
 294         state->in_length = in_data.length;
 295         state->in_offset = in_offset;
 296         state->out_count = 0;
 297
 298         DEBUG(10,("smbd_smb2_write: %s - %s\n",
 299                   fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));
 300
 301         smbreq = smbd_smb2_fake_smb_request(smb2req, fsp);
 302         if (tevent_req_nomem(smbreq, req)) {
 303                 return tevent_req_post(req, ev);
 304         }
 305         state->smbreq = smbreq;
 306
 307         state->fsp = fsp;
 308
 309         if (IS_IPC(smbreq->conn)) {
 310                 struct tevent_req *subreq = NULL;
 311                 bool ok;
 312
 313                 if (!fsp_is_np(fsp)) {
 314                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 315                         return tevent_req_post(req, ev);
 316                 }
 317
 318                 subreq = np_write_send(state, ev,
 319                                        fsp->fake_file_handle,
 320                                        in_data.data,
 321                                        in_data.length);
 322                 if (tevent_req_nomem(subreq, req)) {
 323                         return tevent_req_post(req, ev);
 324                 }
 325                 tevent_req_set_callback(subreq,
 326                                         smbd_smb2_write_pipe_done,
 327                                         req);
 328
 329                 /*
 330                  * Make sure we mark the fsp as having outstanding async
 331                  * activity so we don't crash on shutdown close.
 332                  */
 333
 334                 ok = aio_add_req_to_fsp(fsp, req);
 335                 if (!ok) {
 336                         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 337                         return tevent_req_post(req, ev);
 338                 }
 339
 340                 return req;
 341         }
 342
 343         status = check_any_access_fsp(fsp, FILE_WRITE_DATA|FILE_APPEND_DATA);
 344         if (!NT_STATUS_IS_OK(status)) {
 345                 tevent_req_nterror(req, status);
 346                 return tevent_req_post(req, ev);
 347         }
 348
 349         /* Try and do an asynchronous write. */
 350         status = schedule_aio_smb2_write(conn,
 351                                         smbreq,
 352                                         fsp,
 353                                         in_offset,
 354                                         in_data,
 355                                         state->write_through);
 356
 357         if (NT_STATUS_IS_OK(status)) {
 358                 /*
 359                  * Doing an async write, allow this
 360                  * request to be canceled
 361                  */
 362                 tevent_req_set_cancel_fn(req, smbd_smb2_write_cancel);
 363                 return req;
 364         }
 365
 366         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 367                 /* Real error in setting up aio. Fail. */
 368                 tevent_req_nterror(req, status);
 369                 return tevent_req_post(req, ev);
 370         }
 371
 372         /* Fallback to synchronous. */
 373         init_strict_lock_struct(fsp,
 374                                 fsp->op->global->open_persistent_id,
 375                                 in_offset,
 376                                 in_data.length,
 377                                 WRITE_LOCK,
 378                                 lp_posix_cifsu_locktype(fsp),
 379                                 &lock);
 380
 381         if (!SMB_VFS_STRICT_LOCK_CHECK(conn, fsp, &lock)) {
 382                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
 383                 return tevent_req_post(req, ev);
 384         }
 385
 386         /*
 387          * Note: in_data.data is NULL for the recvfile case.
 388          */
 389         nwritten = write_file(smbreq, fsp,
 390                               (const char *)in_data.data,
 391                               in_offset,
 392                               in_data.length);
 393
 394         status = smb2_write_complete(req, nwritten, errno);
 395
 396         DEBUG(10,("smb2: write on "
 397                 "file %s, offset %.0f, requested %u, written = %u\n",
 398                 fsp_str_dbg(fsp),
 399                 (double)in_offset,
 400                 (unsigned int)in_data.length,
 401                 (unsigned int)nwritten ));
 402
 403         if (!NT_STATUS_IS_OK(status)) {
 404                 tevent_req_nterror(req, status);
 405         } else {
 406                 /* Success. */
 407                 tevent_req_done(req);
 408         }
 409
 410         return tevent_req_post(req, ev);
 411 }
 412
 413 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq)
 414 {
 415         struct tevent_req *req = tevent_req_callback_data(subreq,
 416                                  struct tevent_req);
 417         struct smbd_smb2_write_state *state = tevent_req_data(req,
 418                                               struct smbd_smb2_write_state);
 419         NTSTATUS status;
 420         ssize_t nwritten = -1;
 421
 422         status = np_write_recv(subreq, &nwritten);
 423         TALLOC_FREE(subreq);
 424         if (!NT_STATUS_IS_OK(status)) {
 425                 NTSTATUS old = status;
 426                 status = nt_status_np_pipe(old);
 427                 tevent_req_nterror(req, status);
 428                 return;
 429         }
 430
 431         if ((nwritten == 0 && state->in_length != 0) || (nwritten < 0)) {
 432                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 433                 return;
 434         }
 435
 436         state->out_count = nwritten;
 437
 438         tevent_req_done(req);
 439 }
 440
 441 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
 442                                      uint32_t *out_count)
 443 {
 444         NTSTATUS status;
 445         struct smbd_smb2_write_state *state = tevent_req_data(req,
 446                                               struct smbd_smb2_write_state);
 447
 448         if (tevent_req_is_nterror(req, &status)) {
 449                 tevent_req_received(req);
 450                 return status;
 451         }
 452
 453         *out_count = state->out_count;
 454
 455         tevent_req_received(req);
 456         return NT_STATUS_OK;
 457 }