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                                                DATA_BLOB in_data,
  33                                                uint64_t in_offset,
  34                                                uint32_t in_flags);
  35 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
  36                                      uint32_t *out_count);
  37
  38 static void smbd_smb2_request_write_done(struct tevent_req *subreq);
  39 NTSTATUS smbd_smb2_request_process_write(struct smbd_smb2_request *req)
  40 {
  41         NTSTATUS status;
  42         const uint8_t *inbody;
  43         uint16_t in_data_offset;
  44         uint32_t in_data_length;
  45         DATA_BLOB in_data_buffer;
  46         uint64_t in_offset;
  47         uint64_t in_file_id_persistent;
  48         uint64_t in_file_id_volatile;
  49         struct files_struct *in_fsp;
  50         uint32_t in_flags;
  51         struct tevent_req *subreq;
  52
  53         status = smbd_smb2_request_verify_sizes(req, 0x31);
  54         if (!NT_STATUS_IS_OK(status)) {
  55                 return smbd_smb2_request_error(req, status);
  56         }
  57         inbody = SMBD_SMB2_IN_BODY_PTR(req);
  58
  59         in_data_offset          = SVAL(inbody, 0x02);
  60         in_data_length          = IVAL(inbody, 0x04);
  61         in_offset               = BVAL(inbody, 0x08);
  62         in_file_id_persistent   = BVAL(inbody, 0x10);
  63         in_file_id_volatile     = BVAL(inbody, 0x18);
  64         in_flags                = IVAL(inbody, 0x2C);
  65
  66         if (in_data_offset != (SMB2_HDR_BODY + SMBD_SMB2_IN_BODY_LEN(req))) {
  67                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  68         }
  69
  70         if (in_data_length > SMBD_SMB2_IN_DYN_LEN(req)) {
  71                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  72         }
  73
  74         /* check the max write size */
  75         if (in_data_length > req->sconn->smb2.max_write) {
  76                 DEBUG(2,("smbd_smb2_request_process_write : "
  77                         "client ignored max write :%s: 0x%08X: 0x%08X\n",
  78                         __location__, in_data_length, req->sconn->smb2.max_write));
  79                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  80         }
  81
  82         in_data_buffer.data = SMBD_SMB2_IN_DYN_PTR(req);
  83         in_data_buffer.length = in_data_length;
  84
  85         status = smbd_smb2_request_verify_creditcharge(req, in_data_length);
  86         if (!NT_STATUS_IS_OK(status)) {
  87                 return smbd_smb2_request_error(req, status);
  88         }
  89
  90         in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile);
  91         if (in_fsp == NULL) {
  92                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  93         }
  94
  95         subreq = smbd_smb2_write_send(req, req->sconn->ev_ctx,
  96                                       req, in_fsp,
  97                                       in_data_buffer,
  98                                       in_offset,
  99                                       in_flags);
 100         if (subreq == NULL) {
 101                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 102         }
 103         tevent_req_set_callback(subreq, smbd_smb2_request_write_done, req);
 104
 105         return smbd_smb2_request_pending_queue(req, subreq, 500);
 106 }
 107
 108 static void smbd_smb2_request_write_done(struct tevent_req *subreq)
 109 {
 110         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 111                                         struct smbd_smb2_request);
 112         DATA_BLOB outbody;
 113         DATA_BLOB outdyn;
 114         uint32_t out_count = 0;
 115         NTSTATUS status;
 116         NTSTATUS error; /* transport error */
 117
 118         status = smbd_smb2_write_recv(subreq, &out_count);
 119         TALLOC_FREE(subreq);
 120         if (!NT_STATUS_IS_OK(status)) {
 121                 error = smbd_smb2_request_error(req, status);
 122                 if (!NT_STATUS_IS_OK(error)) {
 123                         smbd_server_connection_terminate(req->sconn,
 124                                                          nt_errstr(error));
 125                         return;
 126                 }
 127                 return;
 128         }
 129
 130         outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
 131         if (outbody.data == NULL) {
 132                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 133                 if (!NT_STATUS_IS_OK(error)) {
 134                         smbd_server_connection_terminate(req->sconn,
 135                                                          nt_errstr(error));
 136                         return;
 137                 }
 138                 return;
 139         }
 140
 141         SSVAL(outbody.data, 0x00, 0x10 + 1);    /* struct size */
 142         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 143         SIVAL(outbody.data, 0x04, out_count);   /* count */
 144         SIVAL(outbody.data, 0x08, 0);           /* remaining */
 145         SSVAL(outbody.data, 0x0C, 0);           /* write channel info offset */
 146         SSVAL(outbody.data, 0x0E, 0);           /* write channel info length */
 147
 148         outdyn = data_blob_const(NULL, 0);
 149
 150         error = smbd_smb2_request_done(req, outbody, &outdyn);
 151         if (!NT_STATUS_IS_OK(error)) {
 152                 smbd_server_connection_terminate(req->sconn, nt_errstr(error));
 153                 return;
 154         }
 155 }
 156
 157 struct smbd_smb2_write_state {
 158         struct smbd_smb2_request *smb2req;
 159         struct smb_request *smbreq;
 160         files_struct *fsp;
 161         bool write_through;
 162         uint32_t in_length;
 163         uint64_t in_offset;
 164         uint32_t out_count;
 165 };
 166
 167 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq);
 168
 169 static NTSTATUS smb2_write_complete_internal(struct tevent_req *req,
 170                                              ssize_t nwritten, int err,
 171                                              bool do_sync)
 172 {
 173         NTSTATUS status;
 174         struct smbd_smb2_write_state *state = tevent_req_data(req,
 175                                         struct smbd_smb2_write_state);
 176         files_struct *fsp = state->fsp;
 177
 178         if (nwritten == -1) {
 179                 status = map_nt_error_from_unix(err);
 180
 181                 DEBUG(2, ("smb2_write failed: %s, file %s, "
 182                           "length=%lu offset=%lu nwritten=-1: %s\n",
 183                           fsp_fnum_dbg(fsp),
 184                           fsp_str_dbg(fsp),
 185                           (unsigned long)state->in_length,
 186                           (unsigned long)state->in_offset,
 187                           nt_errstr(status)));
 188
 189                 return status;
 190         }
 191
 192         DEBUG(3,("smb2: %s, file %s, "
 193                 "length=%lu offset=%lu wrote=%lu\n",
 194                 fsp_fnum_dbg(fsp),
 195                 fsp_str_dbg(fsp),
 196                 (unsigned long)state->in_length,
 197                 (unsigned long)state->in_offset,
 198                 (unsigned long)nwritten));
 199
 200         if ((nwritten == 0) && (state->in_length != 0)) {
 201                 DEBUG(5,("smb2: write [%s] disk full\n",
 202                         fsp_str_dbg(fsp)));
 203                 return NT_STATUS_DISK_FULL;
 204         }
 205
 206         if (do_sync) {
 207                 status = sync_file(fsp->conn, fsp, state->write_through);
 208                 if (!NT_STATUS_IS_OK(status)) {
 209                         DEBUG(5,("smb2: sync_file for %s returned %s\n",
 210                                  fsp_str_dbg(fsp),
 211                                  nt_errstr(status)));
 212                         return status;
 213                 }
 214         }
 215
 216         state->out_count = nwritten;
 217
 218         return NT_STATUS_OK;
 219 }
 220
 221 NTSTATUS smb2_write_complete(struct tevent_req *req, ssize_t nwritten, int err)
 222 {
 223         return smb2_write_complete_internal(req, nwritten, err, true);
 224 }
 225
 226 NTSTATUS smb2_write_complete_nosync(struct tevent_req *req, ssize_t nwritten,
 227                                     int err)
 228 {
 229         return smb2_write_complete_internal(req, nwritten, err, false);
 230 }
 231
 232
 233 static bool smbd_smb2_write_cancel(struct tevent_req *req)
 234 {
 235         struct smbd_smb2_write_state *state =
 236                 tevent_req_data(req,
 237                 struct smbd_smb2_write_state);
 238
 239         return cancel_smb2_aio(state->smbreq);
 240 }
 241
 242 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
 243                                                struct tevent_context *ev,
 244                                                struct smbd_smb2_request *smb2req,
 245                                                struct files_struct *fsp,
 246                                                DATA_BLOB in_data,
 247                                                uint64_t in_offset,
 248                                                uint32_t in_flags)
 249 {
 250         NTSTATUS status;
 251         struct tevent_req *req = NULL;
 252         struct smbd_smb2_write_state *state = NULL;
 253         struct smb_request *smbreq = NULL;
 254         connection_struct *conn = smb2req->tcon->compat;
 255         ssize_t nwritten;
 256         struct lock_struct lock;
 257
 258         req = tevent_req_create(mem_ctx, &state,
 259                                 struct smbd_smb2_write_state);
 260         if (req == NULL) {
 261                 return NULL;
 262         }
 263         state->smb2req = smb2req;
 264         if (in_flags & SMB2_WRITEFLAG_WRITE_THROUGH) {
 265                 state->write_through = true;
 266         }
 267         state->in_length = in_data.length;
 268         state->out_count = 0;
 269
 270         DEBUG(10,("smbd_smb2_write: %s - %s\n",
 271                   fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));
 272
 273         smbreq = smbd_smb2_fake_smb_request(smb2req);
 274         if (tevent_req_nomem(smbreq, req)) {
 275                 return tevent_req_post(req, ev);
 276         }
 277         state->smbreq = smbreq;
 278
 279         state->fsp = fsp;
 280
 281         if (IS_IPC(smbreq->conn)) {
 282                 struct tevent_req *subreq = NULL;
 283
 284                 if (!fsp_is_np(fsp)) {
 285                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 286                         return tevent_req_post(req, ev);
 287                 }
 288
 289                 subreq = np_write_send(state, ev,
 290                                        fsp->fake_file_handle,
 291                                        in_data.data,
 292                                        in_data.length);
 293                 if (tevent_req_nomem(subreq, req)) {
 294                         return tevent_req_post(req, ev);
 295                 }
 296                 tevent_req_set_callback(subreq,
 297                                         smbd_smb2_write_pipe_done,
 298                                         req);
 299                 return req;
 300         }
 301
 302         if (!CHECK_WRITE(fsp)) {
 303                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 304                 return tevent_req_post(req, ev);
 305         }
 306
 307         /* Try and do an asynchronous write. */
 308         status = schedule_aio_smb2_write(conn,
 309                                         smbreq,
 310                                         fsp,
 311                                         in_offset,
 312                                         in_data,
 313                                         state->write_through);
 314
 315         if (NT_STATUS_IS_OK(status)) {
 316                 /*
 317                  * Doing an async write, allow this
 318                  * request to be canceled
 319                  */
 320                 tevent_req_set_cancel_fn(req, smbd_smb2_write_cancel);
 321                 return req;
 322         }
 323
 324         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 325                 /* Real error in setting up aio. Fail. */
 326                 tevent_req_nterror(req, status);
 327                 return tevent_req_post(req, ev);
 328         }
 329
 330         /* Fallback to synchronous. */
 331         init_strict_lock_struct(fsp,
 332                                 fsp->op->global->open_persistent_id,
 333                                 in_offset,
 334                                 in_data.length,
 335                                 WRITE_LOCK,
 336                                 &lock);
 337
 338         if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
 339                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
 340                 return tevent_req_post(req, ev);
 341         }
 342
 343         nwritten = write_file(smbreq, fsp,
 344                               (const char *)in_data.data,
 345                               in_offset,
 346                               in_data.length);
 347
 348         status = smb2_write_complete(req, nwritten, errno);
 349
 350         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 351
 352         DEBUG(10,("smb2: write on "
 353                 "file %s, offset %.0f, requested %u, written = %u\n",
 354                 fsp_str_dbg(fsp),
 355                 (double)in_offset,
 356                 (unsigned int)in_data.length,
 357                 (unsigned int)nwritten ));
 358
 359         if (!NT_STATUS_IS_OK(status)) {
 360                 tevent_req_nterror(req, status);
 361         } else {
 362                 /* Success. */
 363                 tevent_req_done(req);
 364         }
 365
 366         return tevent_req_post(req, ev);
 367 }
 368
 369 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq)
 370 {
 371         struct tevent_req *req = tevent_req_callback_data(subreq,
 372                                  struct tevent_req);
 373         struct smbd_smb2_write_state *state = tevent_req_data(req,
 374                                               struct smbd_smb2_write_state);
 375         NTSTATUS status;
 376         ssize_t nwritten = -1;
 377
 378         status = np_write_recv(subreq, &nwritten);
 379         TALLOC_FREE(subreq);
 380         if (!NT_STATUS_IS_OK(status)) {
 381                 NTSTATUS old = status;
 382                 status = nt_status_np_pipe(old);
 383                 tevent_req_nterror(req, status);
 384                 return;
 385         }
 386
 387         if ((nwritten == 0 && state->in_length != 0) || (nwritten < 0)) {
 388                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 389                 return;
 390         }
 391
 392         state->out_count = nwritten;
 393
 394         tevent_req_done(req);
 395 }
 396
 397 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
 398                                      uint32_t *out_count)
 399 {
 400         NTSTATUS status;
 401         struct smbd_smb2_write_state *state = tevent_req_data(req,
 402                                               struct smbd_smb2_write_state);
 403
 404         if (tevent_req_is_nterror(req, &status)) {
 405                 tevent_req_received(req);
 406                 return status;
 407         }
 408
 409         *out_count = state->out_count;
 410
 411         tevent_req_received(req);
 412         return NT_STATUS_OK;
 413 }