source3/smbd/durable.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Durable Handle default VFS implementation
   4
   5    Copyright (C) Stefan Metzmacher 2012
   6    Copyright (C) Michael Adam 2012
   7    Copyright (C) Volker Lendecke 2012
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "system/filesys.h"
  25 #include "smbd/smbd.h"
  26 #include "smbd/globals.h"
  27 #include "libcli/security/security.h"
  28 #include "messages.h"
  29 #include "librpc/gen_ndr/ndr_open_files.h"
  30 #include "serverid.h"
  31 #include "fake_file.h"
  32
  33 NTSTATUS vfs_default_durable_cookie(struct files_struct *fsp,
  34                                     TALLOC_CTX *mem_ctx,
  35                                     DATA_BLOB *cookie_blob)
  36 {
  37         struct connection_struct *conn = fsp->conn;
  38         enum ndr_err_code ndr_err;
  39         struct vfs_default_durable_cookie cookie;
  40
  41         if (!lp_durable_handles(SNUM(conn))) {
  42                 return NT_STATUS_NOT_SUPPORTED;
  43         }
  44
  45         if (lp_kernel_share_modes(SNUM(conn))) {
  46                 /*
  47                  * We do not support durable handles
  48                  * if kernel share modes (flocks) are used
  49                  */
  50                 return NT_STATUS_NOT_SUPPORTED;
  51         }
  52
  53         if (lp_kernel_oplocks(SNUM(conn))) {
  54                 /*
  55                  * We do not support durable handles
  56                  * if kernel oplocks are used
  57                  */
  58                 return NT_STATUS_NOT_SUPPORTED;
  59         }
  60
  61         if ((fsp->current_lock_count > 0) &&
  62             lp_posix_locking(fsp->conn->params))
  63         {
  64                 /*
  65                  * We do not support durable handles
  66                  * if the handle has posix locks.
  67                  */
  68                 return NT_STATUS_NOT_SUPPORTED;
  69         }
  70
  71         if (fsp->is_directory) {
  72                 return NT_STATUS_NOT_SUPPORTED;
  73         }
  74
  75         if (fsp->fh->fd == -1) {
  76                 return NT_STATUS_NOT_SUPPORTED;
  77         }
  78
  79         if (is_ntfs_stream_smb_fname(fsp->fsp_name)) {
  80                 /*
  81                  * We do not support durable handles
  82                  * on streams for now.
  83                  */
  84                 return NT_STATUS_NOT_SUPPORTED;
  85         }
  86
  87         if (is_fake_file(fsp->fsp_name)) {
  88                 /*
  89                  * We do not support durable handles
  90                  * on fake files.
  91                  */
  92                 return NT_STATUS_NOT_SUPPORTED;
  93         }
  94
  95         ZERO_STRUCT(cookie);
  96         cookie.allow_reconnect = false;
  97         cookie.id = fsp->file_id;
  98         cookie.servicepath = conn->connectpath;
  99         cookie.base_name = fsp->fsp_name->base_name;
 100         cookie.initial_allocation_size = fsp->initial_allocation_size;
 101         cookie.position_information = fsp->fh->position_information;
 102         cookie.update_write_time_triggered = fsp->update_write_time_triggered;
 103         cookie.update_write_time_on_close = fsp->update_write_time_on_close;
 104         cookie.write_time_forced = fsp->write_time_forced;
 105         cookie.close_write_time = fsp->close_write_time;
 106
 107         cookie.stat_info.st_ex_dev = fsp->fsp_name->st.st_ex_dev;
 108         cookie.stat_info.st_ex_ino = fsp->fsp_name->st.st_ex_ino;
 109         cookie.stat_info.st_ex_mode = fsp->fsp_name->st.st_ex_mode;
 110         cookie.stat_info.st_ex_nlink = fsp->fsp_name->st.st_ex_nlink;
 111         cookie.stat_info.st_ex_uid = fsp->fsp_name->st.st_ex_uid;
 112         cookie.stat_info.st_ex_gid = fsp->fsp_name->st.st_ex_gid;
 113         cookie.stat_info.st_ex_rdev = fsp->fsp_name->st.st_ex_rdev;
 114         cookie.stat_info.st_ex_size = fsp->fsp_name->st.st_ex_size;
 115         cookie.stat_info.st_ex_atime = fsp->fsp_name->st.st_ex_atime;
 116         cookie.stat_info.st_ex_mtime = fsp->fsp_name->st.st_ex_mtime;
 117         cookie.stat_info.st_ex_ctime = fsp->fsp_name->st.st_ex_ctime;
 118         cookie.stat_info.st_ex_btime = fsp->fsp_name->st.st_ex_btime;
 119         cookie.stat_info.st_ex_calculated_birthtime = fsp->fsp_name->st.st_ex_calculated_birthtime;
 120         cookie.stat_info.st_ex_blksize = fsp->fsp_name->st.st_ex_blksize;
 121         cookie.stat_info.st_ex_blocks = fsp->fsp_name->st.st_ex_blocks;
 122         cookie.stat_info.st_ex_flags = fsp->fsp_name->st.st_ex_flags;
 123         cookie.stat_info.st_ex_mask = fsp->fsp_name->st.st_ex_mask;
 124
 125         ndr_err = ndr_push_struct_blob(cookie_blob, mem_ctx, &cookie,
 126                         (ndr_push_flags_fn_t)ndr_push_vfs_default_durable_cookie);
 127         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 128                 NTSTATUS status = ndr_map_error2ntstatus(ndr_err);
 129                 return status;
 130         }
 131
 132         return NT_STATUS_OK;
 133 }
 134
 135 NTSTATUS vfs_default_durable_disconnect(struct files_struct *fsp,
 136                                         const DATA_BLOB old_cookie,
 137                                         TALLOC_CTX *mem_ctx,
 138                                         DATA_BLOB *new_cookie)
 139 {
 140         struct connection_struct *conn = fsp->conn;
 141         NTSTATUS status;
 142         enum ndr_err_code ndr_err;
 143         struct vfs_default_durable_cookie cookie;
 144         DATA_BLOB new_cookie_blob = data_blob_null;
 145         struct share_mode_lock *lck;
 146         bool ok;
 147
 148         *new_cookie = data_blob_null;
 149
 150         ZERO_STRUCT(cookie);
 151
 152         ndr_err = ndr_pull_struct_blob(&old_cookie, talloc_tos(), &cookie,
 153                         (ndr_pull_flags_fn_t)ndr_pull_vfs_default_durable_cookie);
 154         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 155                 status = ndr_map_error2ntstatus(ndr_err);
 156                 return status;
 157         }
 158
 159         if (strcmp(cookie.magic, VFS_DEFAULT_DURABLE_COOKIE_MAGIC) != 0) {
 160                 return NT_STATUS_INVALID_PARAMETER;
 161         }
 162
 163         if (cookie.version != VFS_DEFAULT_DURABLE_COOKIE_VERSION) {
 164                 return NT_STATUS_INVALID_PARAMETER;
 165         }
 166
 167         if (!file_id_equal(&fsp->file_id, &cookie.id)) {
 168                 return NT_STATUS_INVALID_PARAMETER;
 169         }
 170
 171         if ((fsp_lease_type(fsp) & SMB2_LEASE_HANDLE) == 0) {
 172                 return NT_STATUS_NOT_SUPPORTED;
 173         }
 174
 175         /*
 176          * For now let it be simple and do not keep
 177          * delete on close files durable open
 178          */
 179         if (fsp->initial_delete_on_close) {
 180                 return NT_STATUS_NOT_SUPPORTED;
 181         }
 182         if (fsp->delete_on_close) {
 183                 return NT_STATUS_NOT_SUPPORTED;
 184         }
 185
 186         if (!VALID_STAT(fsp->fsp_name->st)) {
 187                 return NT_STATUS_NOT_SUPPORTED;
 188         }
 189
 190         if (!S_ISREG(fsp->fsp_name->st.st_ex_mode)) {
 191                 return NT_STATUS_NOT_SUPPORTED;
 192         }
 193
 194         /* Ensure any pending write time updates are done. */
 195         if (fsp->update_write_time_event) {
 196                 update_write_time_handler(fsp->conn->sconn->ev_ctx,
 197                                         fsp->update_write_time_event,
 198                                         timeval_current(),
 199                                         (void *)fsp);
 200         }
 201
 202         /*
 203          * The above checks are done in mark_share_mode_disconnected() too
 204          * but we want to avoid getting the lock if possible
 205          */
 206         lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
 207         if (lck != NULL) {
 208                 struct smb_file_time ft;
 209
 210                 ZERO_STRUCT(ft);
 211
 212                 if (fsp->write_time_forced) {
 213                         ft.mtime = lck->data->changed_write_time;
 214                 } else if (fsp->update_write_time_on_close) {
 215                         if (null_timespec(fsp->close_write_time)) {
 216                                 ft.mtime = timespec_current();
 217                         } else {
 218                                 ft.mtime = fsp->close_write_time;
 219                         }
 220                 }
 221
 222                 if (!null_timespec(ft.mtime)) {
 223                         round_timespec(conn->ts_res, &ft.mtime);
 224                         file_ntimes(conn, fsp->fsp_name, &ft);
 225                 }
 226
 227                 ok = mark_share_mode_disconnected(lck, fsp);
 228                 if (!ok) {
 229                         TALLOC_FREE(lck);
 230                 }
 231         }
 232         if (lck != NULL) {
 233                 ok = brl_mark_disconnected(fsp);
 234                 if (!ok) {
 235                         TALLOC_FREE(lck);
 236                 }
 237         }
 238         if (lck == NULL) {
 239                 return NT_STATUS_NOT_SUPPORTED;
 240         }
 241         TALLOC_FREE(lck);
 242
 243         status = vfs_stat_fsp(fsp);
 244         if (!NT_STATUS_IS_OK(status)) {
 245                 return status;
 246         }
 247
 248         ZERO_STRUCT(cookie);
 249         cookie.allow_reconnect = true;
 250         cookie.id = fsp->file_id;
 251         cookie.servicepath = conn->connectpath;
 252         cookie.base_name = fsp->fsp_name->base_name;
 253         cookie.initial_allocation_size = fsp->initial_allocation_size;
 254         cookie.position_information = fsp->fh->position_information;
 255         cookie.update_write_time_triggered = fsp->update_write_time_triggered;
 256         cookie.update_write_time_on_close = fsp->update_write_time_on_close;
 257         cookie.write_time_forced = fsp->write_time_forced;
 258         cookie.close_write_time = fsp->close_write_time;
 259
 260         cookie.stat_info.st_ex_dev = fsp->fsp_name->st.st_ex_dev;
 261         cookie.stat_info.st_ex_ino = fsp->fsp_name->st.st_ex_ino;
 262         cookie.stat_info.st_ex_mode = fsp->fsp_name->st.st_ex_mode;
 263         cookie.stat_info.st_ex_nlink = fsp->fsp_name->st.st_ex_nlink;
 264         cookie.stat_info.st_ex_uid = fsp->fsp_name->st.st_ex_uid;
 265         cookie.stat_info.st_ex_gid = fsp->fsp_name->st.st_ex_gid;
 266         cookie.stat_info.st_ex_rdev = fsp->fsp_name->st.st_ex_rdev;
 267         cookie.stat_info.st_ex_size = fsp->fsp_name->st.st_ex_size;
 268         cookie.stat_info.st_ex_atime = fsp->fsp_name->st.st_ex_atime;
 269         cookie.stat_info.st_ex_mtime = fsp->fsp_name->st.st_ex_mtime;
 270         cookie.stat_info.st_ex_ctime = fsp->fsp_name->st.st_ex_ctime;
 271         cookie.stat_info.st_ex_btime = fsp->fsp_name->st.st_ex_btime;
 272         cookie.stat_info.st_ex_calculated_birthtime = fsp->fsp_name->st.st_ex_calculated_birthtime;
 273         cookie.stat_info.st_ex_blksize = fsp->fsp_name->st.st_ex_blksize;
 274         cookie.stat_info.st_ex_blocks = fsp->fsp_name->st.st_ex_blocks;
 275         cookie.stat_info.st_ex_flags = fsp->fsp_name->st.st_ex_flags;
 276         cookie.stat_info.st_ex_mask = fsp->fsp_name->st.st_ex_mask;
 277
 278         ndr_err = ndr_push_struct_blob(&new_cookie_blob, mem_ctx, &cookie,
 279                         (ndr_push_flags_fn_t)ndr_push_vfs_default_durable_cookie);
 280         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 281                 status = ndr_map_error2ntstatus(ndr_err);
 282                 return status;
 283         }
 284
 285         status = fd_close(fsp);
 286         if (!NT_STATUS_IS_OK(status)) {
 287                 data_blob_free(&new_cookie_blob);
 288                 return status;
 289         }
 290
 291         *new_cookie = new_cookie_blob;
 292         return NT_STATUS_OK;
 293 }
 294
 295
 296 /**
 297  * Check whether a cookie-stored struct info is the same
 298  * as a given SMB_STRUCT_STAT, as coming with the fsp.
 299  */
 300 static bool vfs_default_durable_reconnect_check_stat(
 301                                 struct vfs_default_durable_stat *cookie_st,
 302                                 SMB_STRUCT_STAT *fsp_st,
 303                                 const char *name)
 304 {
 305         int ret;
 306
 307         if (cookie_st->st_ex_dev != fsp_st->st_ex_dev) {
 308                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 309                           "stat_ex.%s differs: "
 310                           "cookie:%llu != stat:%llu, "
 311                           "denying durable reconnect\n",
 312                           name,
 313                           "st_ex_dev",
 314                           (unsigned long long)cookie_st->st_ex_dev,
 315                           (unsigned long long)fsp_st->st_ex_dev));
 316                 return false;
 317         }
 318
 319         if (cookie_st->st_ex_ino != fsp_st->st_ex_ino) {
 320                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 321                           "stat_ex.%s differs: "
 322                           "cookie:%llu != stat:%llu, "
 323                           "denying durable reconnect\n",
 324                           name,
 325                           "st_ex_ino",
 326                           (unsigned long long)cookie_st->st_ex_ino,
 327                           (unsigned long long)fsp_st->st_ex_ino));
 328                 return false;
 329         }
 330
 331         if (cookie_st->st_ex_mode != fsp_st->st_ex_mode) {
 332                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 333                           "stat_ex.%s differs: "
 334                           "cookie:%llu != stat:%llu, "
 335                           "denying durable reconnect\n",
 336                           name,
 337                           "st_ex_mode",
 338                           (unsigned long long)cookie_st->st_ex_mode,
 339                           (unsigned long long)fsp_st->st_ex_mode));
 340                 return false;
 341         }
 342
 343         if (cookie_st->st_ex_nlink != fsp_st->st_ex_nlink) {
 344                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 345                           "stat_ex.%s differs: "
 346                           "cookie:%llu != stat:%llu, "
 347                           "denying durable reconnect\n",
 348                           name,
 349                           "st_ex_nlink",
 350                           (unsigned long long)cookie_st->st_ex_nlink,
 351                           (unsigned long long)fsp_st->st_ex_nlink));
 352                 return false;
 353         }
 354
 355         if (cookie_st->st_ex_uid != fsp_st->st_ex_uid) {
 356                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 357                           "stat_ex.%s differs: "
 358                           "cookie:%llu != stat:%llu, "
 359                           "denying durable reconnect\n",
 360                           name,
 361                           "st_ex_uid",
 362                           (unsigned long long)cookie_st->st_ex_uid,
 363                           (unsigned long long)fsp_st->st_ex_uid));
 364                 return false;
 365         }
 366
 367         if (cookie_st->st_ex_gid != fsp_st->st_ex_gid) {
 368                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 369                           "stat_ex.%s differs: "
 370                           "cookie:%llu != stat:%llu, "
 371                           "denying durable reconnect\n",
 372                           name,
 373                           "st_ex_gid",
 374                           (unsigned long long)cookie_st->st_ex_gid,
 375                           (unsigned long long)fsp_st->st_ex_gid));
 376                 return false;
 377         }
 378
 379         if (cookie_st->st_ex_rdev != fsp_st->st_ex_rdev) {
 380                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 381                           "stat_ex.%s differs: "
 382                           "cookie:%llu != stat:%llu, "
 383                           "denying durable reconnect\n",
 384                           name,
 385                           "st_ex_rdev",
 386                           (unsigned long long)cookie_st->st_ex_rdev,
 387                           (unsigned long long)fsp_st->st_ex_rdev));
 388                 return false;
 389         }
 390
 391         if (cookie_st->st_ex_size != fsp_st->st_ex_size) {
 392                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 393                           "stat_ex.%s differs: "
 394                           "cookie:%llu != stat:%llu, "
 395                           "denying durable reconnect\n",
 396                           name,
 397                           "st_ex_size",
 398                           (unsigned long long)cookie_st->st_ex_size,
 399                           (unsigned long long)fsp_st->st_ex_size));
 400                 return false;
 401         }
 402
 403         ret = timespec_compare(&cookie_st->st_ex_atime,
 404                                &fsp_st->st_ex_atime);
 405         if (ret != 0) {
 406                 struct timeval tc, ts;
 407                 tc = convert_timespec_to_timeval(cookie_st->st_ex_atime);
 408                 ts = convert_timespec_to_timeval(fsp_st->st_ex_atime);
 409
 410                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 411                           "stat_ex.%s differs: "
 412                           "cookie:'%s' != stat:'%s', "
 413                           "denying durable reconnect\n",
 414                           name,
 415                           "st_ex_atime",
 416                           timeval_string(talloc_tos(), &tc, true),
 417                           timeval_string(talloc_tos(), &ts, true)));
 418                 return false;
 419         }
 420
 421         ret = timespec_compare(&cookie_st->st_ex_mtime,
 422                                &fsp_st->st_ex_mtime);
 423         if (ret != 0) {
 424                 struct timeval tc, ts;
 425                 tc = convert_timespec_to_timeval(cookie_st->st_ex_mtime);
 426                 ts = convert_timespec_to_timeval(fsp_st->st_ex_mtime);
 427
 428                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 429                           "stat_ex.%s differs: "
 430                           "cookie:'%s' != stat:'%s', "
 431                           "denying durable reconnect\n",
 432                           name,
 433                           "st_ex_mtime",
 434                           timeval_string(talloc_tos(), &tc, true),
 435                           timeval_string(talloc_tos(), &ts, true)));
 436                 return false;
 437         }
 438
 439         ret = timespec_compare(&cookie_st->st_ex_ctime,
 440                                &fsp_st->st_ex_ctime);
 441         if (ret != 0) {
 442                 struct timeval tc, ts;
 443                 tc = convert_timespec_to_timeval(cookie_st->st_ex_ctime);
 444                 ts = convert_timespec_to_timeval(fsp_st->st_ex_ctime);
 445
 446                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 447                           "stat_ex.%s differs: "
 448                           "cookie:'%s' != stat:'%s', "
 449                           "denying durable reconnect\n",
 450                           name,
 451                           "st_ex_ctime",
 452                           timeval_string(talloc_tos(), &tc, true),
 453                           timeval_string(talloc_tos(), &ts, true)));
 454                 return false;
 455         }
 456
 457         ret = timespec_compare(&cookie_st->st_ex_btime,
 458                                &fsp_st->st_ex_btime);
 459         if (ret != 0) {
 460                 struct timeval tc, ts;
 461                 tc = convert_timespec_to_timeval(cookie_st->st_ex_btime);
 462                 ts = convert_timespec_to_timeval(fsp_st->st_ex_btime);
 463
 464                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 465                           "stat_ex.%s differs: "
 466                           "cookie:'%s' != stat:'%s', "
 467                           "denying durable reconnect\n",
 468                           name,
 469                           "st_ex_btime",
 470                           timeval_string(talloc_tos(), &tc, true),
 471                           timeval_string(talloc_tos(), &ts, true)));
 472                 return false;
 473         }
 474
 475         if (cookie_st->st_ex_calculated_birthtime !=
 476             fsp_st->st_ex_calculated_birthtime)
 477         {
 478                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 479                           "stat_ex.%s differs: "
 480                           "cookie:%llu != stat:%llu, "
 481                           "denying durable reconnect\n",
 482                           name,
 483                           "st_ex_calculated_birthtime",
 484                           (unsigned long long)cookie_st->st_ex_calculated_birthtime,
 485                           (unsigned long long)fsp_st->st_ex_calculated_birthtime));
 486                 return false;
 487         }
 488
 489         if (cookie_st->st_ex_blksize != fsp_st->st_ex_blksize) {
 490                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 491                           "stat_ex.%s differs: "
 492                           "cookie:%llu != stat:%llu, "
 493                           "denying durable reconnect\n",
 494                           name,
 495                           "st_ex_blksize",
 496                           (unsigned long long)cookie_st->st_ex_blksize,
 497                           (unsigned long long)fsp_st->st_ex_blksize));
 498                 return false;
 499         }
 500
 501         if (cookie_st->st_ex_blocks != fsp_st->st_ex_blocks) {
 502                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 503                           "stat_ex.%s differs: "
 504                           "cookie:%llu != stat:%llu, "
 505                           "denying durable reconnect\n",
 506                           name,
 507                           "st_ex_blocks",
 508                           (unsigned long long)cookie_st->st_ex_blocks,
 509                           (unsigned long long)fsp_st->st_ex_blocks));
 510                 return false;
 511         }
 512
 513         if (cookie_st->st_ex_flags != fsp_st->st_ex_flags) {
 514                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 515                           "stat_ex.%s differs: "
 516                           "cookie:%llu != stat:%llu, "
 517                           "denying durable reconnect\n",
 518                           name,
 519                           "st_ex_flags",
 520                           (unsigned long long)cookie_st->st_ex_flags,
 521                           (unsigned long long)fsp_st->st_ex_flags));
 522                 return false;
 523         }
 524
 525         if (cookie_st->st_ex_mask != fsp_st->st_ex_mask) {
 526                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 527                           "stat_ex.%s differs: "
 528                           "cookie:%llu != stat:%llu, "
 529                           "denying durable reconnect\n",
 530                           name,
 531                           "st_ex_mask",
 532                           (unsigned long long)cookie_st->st_ex_mask,
 533                           (unsigned long long)fsp_st->st_ex_mask));
 534                 return false;
 535         }
 536
 537         return true;
 538 }
 539
 540 NTSTATUS vfs_default_durable_reconnect(struct connection_struct *conn,
 541                                        struct smb_request *smb1req,
 542                                        struct smbXsrv_open *op,
 543                                        const DATA_BLOB old_cookie,
 544                                        TALLOC_CTX *mem_ctx,
 545                                        files_struct **result,
 546                                        DATA_BLOB *new_cookie)
 547 {
 548         struct share_mode_lock *lck;
 549         struct share_mode_entry *e;
 550         struct files_struct *fsp = NULL;
 551         NTSTATUS status;
 552         bool ok;
 553         int ret;
 554         int flags = 0;
 555         struct file_id file_id;
 556         struct smb_filename *smb_fname = NULL;
 557         enum ndr_err_code ndr_err;
 558         struct vfs_default_durable_cookie cookie;
 559         DATA_BLOB new_cookie_blob = data_blob_null;
 560
 561         *result = NULL;
 562         *new_cookie = data_blob_null;
 563
 564         if (!lp_durable_handles(SNUM(conn))) {
 565                 return NT_STATUS_NOT_SUPPORTED;
 566         }
 567
 568         /*
 569          * the checks for kernel oplocks
 570          * and similar things are done
 571          * in the vfs_default_durable_cookie()
 572          * call below.
 573          */
 574
 575         ZERO_STRUCT(cookie);
 576
 577         ndr_err = ndr_pull_struct_blob(&old_cookie, talloc_tos(), &cookie,
 578                         (ndr_pull_flags_fn_t)ndr_pull_vfs_default_durable_cookie);
 579         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 580                 status = ndr_map_error2ntstatus(ndr_err);
 581                 return status;
 582         }
 583
 584         if (strcmp(cookie.magic, VFS_DEFAULT_DURABLE_COOKIE_MAGIC) != 0) {
 585                 return NT_STATUS_INVALID_PARAMETER;
 586         }
 587
 588         if (cookie.version != VFS_DEFAULT_DURABLE_COOKIE_VERSION) {
 589                 return NT_STATUS_INVALID_PARAMETER;
 590         }
 591
 592         if (!cookie.allow_reconnect) {
 593                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 594         }
 595
 596         if (strcmp(cookie.servicepath, conn->connectpath) != 0) {
 597                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 598         }
 599
 600         /* Create an smb_filename with stream_name == NULL. */
 601         smb_fname = synthetic_smb_fname(talloc_tos(), cookie.base_name,
 602                                         NULL, NULL);
 603         if (smb_fname == NULL) {
 604                 return NT_STATUS_NO_MEMORY;
 605         }
 606
 607         ret = SMB_VFS_LSTAT(conn, smb_fname);
 608         if (ret == -1) {
 609                 status = map_nt_error_from_unix_common(errno);
 610                 DEBUG(1, ("Unable to lstat stream: %s => %s\n",
 611                           smb_fname_str_dbg(smb_fname),
 612                           nt_errstr(status)));
 613                 return status;
 614         }
 615
 616         if (!S_ISREG(smb_fname->st.st_ex_mode)) {
 617                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 618         }
 619
 620         file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
 621         if (!file_id_equal(&cookie.id, &file_id)) {
 622                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 623         }
 624
 625         /*
 626          * 1. check entry in locking.tdb
 627          */
 628
 629         lck = get_existing_share_mode_lock(mem_ctx, file_id);
 630         if (lck == NULL) {
 631                 DEBUG(5, ("vfs_default_durable_reconnect: share-mode lock "
 632                            "not obtained from db\n"));
 633                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 634         }
 635
 636         if (lck->data->num_share_modes == 0) {
 637                 DEBUG(1, ("vfs_default_durable_reconnect: Error: no share-mode "
 638                           "entry in existing share mode lock\n"));
 639                 TALLOC_FREE(lck);
 640                 return NT_STATUS_INTERNAL_DB_ERROR;
 641         }
 642
 643         if (lck->data->num_share_modes > 1) {
 644                 /*
 645                  * It can't be durable if there is more than one handle
 646                  * on the file.
 647                  */
 648                 DEBUG(5, ("vfs_default_durable_reconnect: more than one "
 649                           "share-mode entry - can not be durable\n"));
 650                 TALLOC_FREE(lck);
 651                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 652         }
 653
 654         e = &lck->data->share_modes[0];
 655
 656         if (!server_id_is_disconnected(&e->pid)) {
 657                 DEBUG(5, ("vfs_default_durable_reconnect: denying durable "
 658                           "reconnect for handle that was not marked "
 659                           "disconnected (e.g. smbd or cluster node died)\n"));
 660                 TALLOC_FREE(lck);
 661                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 662         }
 663
 664         if (e->share_file_id != op->global->open_persistent_id) {
 665                 DEBUG(5, ("vfs_default_durable_reconnect: denying durable "
 666                           "share_file_id changed %llu != %llu"
 667                           "(e.g. another client had opened the file)\n",
 668                           (unsigned long long)e->share_file_id,
 669                           (unsigned long long)op->global->open_persistent_id));
 670                 TALLOC_FREE(lck);
 671                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 672         }
 673
 674         if ((e->access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA)) &&
 675             !CAN_WRITE(conn))
 676         {
 677                 DEBUG(5, ("vfs_default_durable_reconnect: denying durable "
 678                           "share[%s] is not writeable anymore\n",
 679                           lp_servicename(talloc_tos(), SNUM(conn))));
 680                 TALLOC_FREE(lck);
 681                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 682         }
 683
 684         /*
 685          * 2. proceed with opening file
 686          */
 687
 688         status = fsp_new(conn, conn, &fsp);
 689         if (!NT_STATUS_IS_OK(status)) {
 690                 DEBUG(0, ("vfs_default_durable_reconnect: failed to create "
 691                           "new fsp: %s\n", nt_errstr(status)));
 692                 TALLOC_FREE(lck);
 693                 return status;
 694         }
 695
 696         fsp->fh->private_options = e->private_options;
 697         fsp->fh->gen_id = smbXsrv_open_hash(op);
 698         fsp->file_id = file_id;
 699         fsp->file_pid = smb1req->smbpid;
 700         fsp->vuid = smb1req->vuid;
 701         fsp->open_time = e->time;
 702         fsp->access_mask = e->access_mask;
 703         fsp->share_access = e->share_access;
 704         fsp->can_read = ((fsp->access_mask & (FILE_READ_DATA)) != 0);
 705         fsp->can_write = ((fsp->access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA)) != 0);
 706         fsp->fnum = op->local_id;
 707
 708         /*
 709          * TODO:
 710          * Do we need to store the modified flag in the DB?
 711          */
 712         fsp->modified = false;
 713         /*
 714          * no durables for directories
 715          */
 716         fsp->is_directory = false;
 717         /*
 718          * For normal files, can_lock == !is_directory
 719          */
 720         fsp->can_lock = true;
 721         /*
 722          * We do not support aio write behind for smb2
 723          */
 724         fsp->aio_write_behind = false;
 725         fsp->oplock_type = e->op_type;
 726
 727         if (fsp->oplock_type == LEASE_OPLOCK) {
 728                 struct share_mode_lease *l = &lck->data->leases[e->lease_idx];
 729                 struct smb2_lease_key key;
 730
 731                 key.data[0] = l->lease_key.data[0];
 732                 key.data[1] = l->lease_key.data[1];
 733
 734                 fsp->lease = find_fsp_lease(fsp, &key, l);
 735                 if (fsp->lease == NULL) {
 736                         TALLOC_FREE(lck);
 737                         fsp_free(fsp);
 738                         return NT_STATUS_NO_MEMORY;
 739                 }
 740
 741                 /*
 742                  * Ensure the existing client guid matches the
 743                  * stored one in the share_mode_lease.
 744                  */
 745                 if (!GUID_equal(fsp_client_guid(fsp),
 746                                 &l->client_guid)) {
 747                         TALLOC_FREE(lck);
 748                         fsp_free(fsp);
 749                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 750                 }
 751         }
 752
 753         fsp->initial_allocation_size = cookie.initial_allocation_size;
 754         fsp->fh->position_information = cookie.position_information;
 755         fsp->update_write_time_triggered = cookie.update_write_time_triggered;
 756         fsp->update_write_time_on_close = cookie.update_write_time_on_close;
 757         fsp->write_time_forced = cookie.write_time_forced;
 758         fsp->close_write_time = cookie.close_write_time;
 759
 760         status = fsp_set_smb_fname(fsp, smb_fname);
 761         if (!NT_STATUS_IS_OK(status)) {
 762                 TALLOC_FREE(lck);
 763                 fsp_free(fsp);
 764                 DEBUG(0, ("vfs_default_durable_reconnect: "
 765                           "fsp_set_smb_fname failed: %s\n",
 766                           nt_errstr(status)));
 767                 return status;
 768         }
 769
 770         op->compat = fsp;
 771         fsp->op = op;
 772
 773         e->pid = messaging_server_id(conn->sconn->msg_ctx);
 774         e->op_mid = smb1req->mid;
 775         e->share_file_id = fsp->fh->gen_id;
 776
 777         ok = brl_reconnect_disconnected(fsp);
 778         if (!ok) {
 779                 status = NT_STATUS_INTERNAL_ERROR;
 780                 DEBUG(1, ("vfs_default_durable_reconnect: "
 781                           "failed to reopen brlocks: %s\n",
 782                           nt_errstr(status)));
 783                 TALLOC_FREE(lck);
 784                 op->compat = NULL;
 785                 fsp_free(fsp);
 786                 return status;
 787         }
 788
 789         /*
 790          * TODO: properly calculate open flags
 791          */
 792         if (fsp->can_write && fsp->can_read) {
 793                 flags = O_RDWR;
 794         } else if (fsp->can_write) {
 795                 flags = O_WRONLY;
 796         } else if (fsp->can_read) {
 797                 flags = O_RDONLY;
 798         }
 799
 800         status = fd_open(conn, fsp, flags, 0 /* mode */);
 801         if (!NT_STATUS_IS_OK(status)) {
 802                 TALLOC_FREE(lck);
 803                 DEBUG(1, ("vfs_default_durable_reconnect: failed to open "
 804                           "file: %s\n", nt_errstr(status)));
 805                 op->compat = NULL;
 806                 fsp_free(fsp);
 807                 return status;
 808         }
 809
 810         /*
 811          * We now check the stat info stored in the cookie against
 812          * the current stat data from the file we just opened.
 813          * If any detail differs, we deny the durable reconnect,
 814          * because in that case it is very likely that someone
 815          * opened the file while the handle was disconnected,
 816          * which has to be interpreted as an oplock break.
 817          */
 818
 819         ret = SMB_VFS_FSTAT(fsp, &fsp->fsp_name->st);
 820         if (ret == -1) {
 821                 status = map_nt_error_from_unix_common(errno);
 822                 DEBUG(1, ("Unable to fstat stream: %s => %s\n",
 823                           smb_fname_str_dbg(smb_fname),
 824                           nt_errstr(status)));
 825                 ret = SMB_VFS_CLOSE(fsp);
 826                 if (ret == -1) {
 827                         DEBUG(0, ("vfs_default_durable_reconnect: "
 828                                   "SMB_VFS_CLOSE failed (%s) - leaking file "
 829                                   "descriptor\n", strerror(errno)));
 830                 }
 831                 TALLOC_FREE(lck);
 832                 op->compat = NULL;
 833                 fsp_free(fsp);
 834                 return status;
 835         }
 836
 837         if (!S_ISREG(fsp->fsp_name->st.st_ex_mode)) {
 838                 ret = SMB_VFS_CLOSE(fsp);
 839                 if (ret == -1) {
 840                         DEBUG(0, ("vfs_default_durable_reconnect: "
 841                                   "SMB_VFS_CLOSE failed (%s) - leaking file "
 842                                   "descriptor\n", strerror(errno)));
 843                 }
 844                 TALLOC_FREE(lck);
 845                 op->compat = NULL;
 846                 fsp_free(fsp);
 847                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 848         }
 849
 850         file_id = vfs_file_id_from_sbuf(conn, &fsp->fsp_name->st);
 851         if (!file_id_equal(&cookie.id, &file_id)) {
 852                 ret = SMB_VFS_CLOSE(fsp);
 853                 if (ret == -1) {
 854                         DEBUG(0, ("vfs_default_durable_reconnect: "
 855                                   "SMB_VFS_CLOSE failed (%s) - leaking file "
 856                                   "descriptor\n", strerror(errno)));
 857                 }
 858                 TALLOC_FREE(lck);
 859                 op->compat = NULL;
 860                 fsp_free(fsp);
 861                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 862         }
 863
 864         ok = vfs_default_durable_reconnect_check_stat(&cookie.stat_info,
 865                                                       &fsp->fsp_name->st,
 866                                                       fsp_str_dbg(fsp));
 867         if (!ok) {
 868                 ret = SMB_VFS_CLOSE(fsp);
 869                 if (ret == -1) {
 870                         DEBUG(0, ("vfs_default_durable_reconnect: "
 871                                   "SMB_VFS_CLOSE failed (%s) - leaking file "
 872                                   "descriptor\n", strerror(errno)));
 873                 }
 874                 TALLOC_FREE(lck);
 875                 op->compat = NULL;
 876                 fsp_free(fsp);
 877                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 878         }
 879
 880         status = set_file_oplock(fsp);
 881         if (!NT_STATUS_IS_OK(status)) {
 882                 DEBUG(1, ("vfs_default_durable_reconnect failed to set oplock "
 883                           "after opening file: %s\n", nt_errstr(status)));
 884                 ret = SMB_VFS_CLOSE(fsp);
 885                 if (ret == -1) {
 886                         DEBUG(0, ("vfs_default_durable_reconnect: "
 887                                   "SMB_VFS_CLOSE failed (%s) - leaking file "
 888                                   "descriptor\n", strerror(errno)));
 889                 }
 890                 TALLOC_FREE(lck);
 891                 op->compat = NULL;
 892                 fsp_free(fsp);
 893                 return status;
 894         }
 895
 896         status = vfs_default_durable_cookie(fsp, mem_ctx, &new_cookie_blob);
 897         if (!NT_STATUS_IS_OK(status)) {
 898                 TALLOC_FREE(lck);
 899                 DEBUG(1, ("vfs_default_durable_reconnect: "
 900                           "vfs_default_durable_cookie - %s\n",
 901                           nt_errstr(status)));
 902                 op->compat = NULL;
 903                 fsp_free(fsp);
 904                 return status;
 905         }
 906
 907         smb1req->chain_fsp = fsp;
 908         smb1req->smb2req->compat_chain_fsp = fsp;
 909
 910         DEBUG(10, ("vfs_default_durable_reconnect: opened file '%s'\n",
 911                    fsp_str_dbg(fsp)));
 912
 913         /*
 914          * release the sharemode lock: this writes the changes
 915          */
 916         lck->data->modified = true;
 917         TALLOC_FREE(lck);
 918
 919         *result = fsp;
 920         *new_cookie = new_cookie_blob;
 921
 922         return NT_STATUS_OK;
 923 }