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         cookie.stat_info.vfs_private = fsp->fsp_name->st.vfs_private;
 125
 126         ndr_err = ndr_push_struct_blob(cookie_blob, mem_ctx, &cookie,
 127                         (ndr_push_flags_fn_t)ndr_push_vfs_default_durable_cookie);
 128         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 129                 NTSTATUS status = ndr_map_error2ntstatus(ndr_err);
 130                 return status;
 131         }
 132
 133         return NT_STATUS_OK;
 134 }
 135
 136 NTSTATUS vfs_default_durable_disconnect(struct files_struct *fsp,
 137                                         const DATA_BLOB old_cookie,
 138                                         TALLOC_CTX *mem_ctx,
 139                                         DATA_BLOB *new_cookie)
 140 {
 141         struct connection_struct *conn = fsp->conn;
 142         NTSTATUS status;
 143         enum ndr_err_code ndr_err;
 144         struct vfs_default_durable_cookie cookie;
 145         DATA_BLOB new_cookie_blob = data_blob_null;
 146         struct share_mode_lock *lck;
 147         bool ok;
 148
 149         *new_cookie = data_blob_null;
 150
 151         ZERO_STRUCT(cookie);
 152
 153         ndr_err = ndr_pull_struct_blob(&old_cookie, talloc_tos(), &cookie,
 154                         (ndr_pull_flags_fn_t)ndr_pull_vfs_default_durable_cookie);
 155         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 156                 status = ndr_map_error2ntstatus(ndr_err);
 157                 return status;
 158         }
 159
 160         if (strcmp(cookie.magic, VFS_DEFAULT_DURABLE_COOKIE_MAGIC) != 0) {
 161                 return NT_STATUS_INVALID_PARAMETER;
 162         }
 163
 164         if (cookie.version != VFS_DEFAULT_DURABLE_COOKIE_VERSION) {
 165                 return NT_STATUS_INVALID_PARAMETER;
 166         }
 167
 168         if (!file_id_equal(&fsp->file_id, &cookie.id)) {
 169                 return NT_STATUS_INVALID_PARAMETER;
 170         }
 171
 172         if (!BATCH_OPLOCK_TYPE(fsp->oplock_type)) {
 173                 return NT_STATUS_NOT_SUPPORTED;
 174         }
 175
 176         if (fsp->num_pending_break_messages > 0) {
 177                 return NT_STATUS_NOT_SUPPORTED;
 178         }
 179
 180         /*
 181          * For now let it be simple and do not keep
 182          * delete on close files durable open
 183          */
 184         if (fsp->initial_delete_on_close) {
 185                 return NT_STATUS_NOT_SUPPORTED;
 186         }
 187         if (fsp->delete_on_close) {
 188                 return NT_STATUS_NOT_SUPPORTED;
 189         }
 190
 191         if (!VALID_STAT(fsp->fsp_name->st)) {
 192                 return NT_STATUS_NOT_SUPPORTED;
 193         }
 194
 195         if (!S_ISREG(fsp->fsp_name->st.st_ex_mode)) {
 196                 return NT_STATUS_NOT_SUPPORTED;
 197         }
 198
 199         /* Ensure any pending write time updates are done. */
 200         if (fsp->update_write_time_event) {
 201                 update_write_time_handler(fsp->conn->sconn->ev_ctx,
 202                                         fsp->update_write_time_event,
 203                                         timeval_current(),
 204                                         (void *)fsp);
 205         }
 206
 207         /*
 208          * The above checks are done in mark_share_mode_disconnected() too
 209          * but we want to avoid getting the lock if possible
 210          */
 211         lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
 212         if (lck != NULL) {
 213                 struct smb_file_time ft;
 214
 215                 ZERO_STRUCT(ft);
 216
 217                 if (fsp->write_time_forced) {
 218                         ft.mtime = lck->data->changed_write_time;
 219                 } else if (fsp->update_write_time_on_close) {
 220                         if (null_timespec(fsp->close_write_time)) {
 221                                 ft.mtime = timespec_current();
 222                         } else {
 223                                 ft.mtime = fsp->close_write_time;
 224                         }
 225                 }
 226
 227                 if (!null_timespec(ft.mtime)) {
 228                         round_timespec(conn->ts_res, &ft.mtime);
 229                         file_ntimes(conn, fsp->fsp_name, &ft);
 230                 }
 231
 232                 ok = mark_share_mode_disconnected(lck, fsp);
 233                 if (!ok) {
 234                         TALLOC_FREE(lck);
 235                 }
 236         }
 237         if (lck != NULL) {
 238                 ok = brl_mark_disconnected(fsp);
 239                 if (!ok) {
 240                         TALLOC_FREE(lck);
 241                 }
 242         }
 243         if (lck == NULL) {
 244                 return NT_STATUS_NOT_SUPPORTED;
 245         }
 246         TALLOC_FREE(lck);
 247
 248         status = vfs_stat_fsp(fsp);
 249         if (!NT_STATUS_IS_OK(status)) {
 250                 return status;
 251         }
 252
 253         ZERO_STRUCT(cookie);
 254         cookie.allow_reconnect = true;
 255         cookie.id = fsp->file_id;
 256         cookie.servicepath = conn->connectpath;
 257         cookie.base_name = fsp->fsp_name->base_name;
 258         cookie.initial_allocation_size = fsp->initial_allocation_size;
 259         cookie.position_information = fsp->fh->position_information;
 260         cookie.update_write_time_triggered = fsp->update_write_time_triggered;
 261         cookie.update_write_time_on_close = fsp->update_write_time_on_close;
 262         cookie.write_time_forced = fsp->write_time_forced;
 263         cookie.close_write_time = fsp->close_write_time;
 264
 265         cookie.stat_info.st_ex_dev = fsp->fsp_name->st.st_ex_dev;
 266         cookie.stat_info.st_ex_ino = fsp->fsp_name->st.st_ex_ino;
 267         cookie.stat_info.st_ex_mode = fsp->fsp_name->st.st_ex_mode;
 268         cookie.stat_info.st_ex_nlink = fsp->fsp_name->st.st_ex_nlink;
 269         cookie.stat_info.st_ex_uid = fsp->fsp_name->st.st_ex_uid;
 270         cookie.stat_info.st_ex_gid = fsp->fsp_name->st.st_ex_gid;
 271         cookie.stat_info.st_ex_rdev = fsp->fsp_name->st.st_ex_rdev;
 272         cookie.stat_info.st_ex_size = fsp->fsp_name->st.st_ex_size;
 273         cookie.stat_info.st_ex_atime = fsp->fsp_name->st.st_ex_atime;
 274         cookie.stat_info.st_ex_mtime = fsp->fsp_name->st.st_ex_mtime;
 275         cookie.stat_info.st_ex_ctime = fsp->fsp_name->st.st_ex_ctime;
 276         cookie.stat_info.st_ex_btime = fsp->fsp_name->st.st_ex_btime;
 277         cookie.stat_info.st_ex_calculated_birthtime = fsp->fsp_name->st.st_ex_calculated_birthtime;
 278         cookie.stat_info.st_ex_blksize = fsp->fsp_name->st.st_ex_blksize;
 279         cookie.stat_info.st_ex_blocks = fsp->fsp_name->st.st_ex_blocks;
 280         cookie.stat_info.st_ex_flags = fsp->fsp_name->st.st_ex_flags;
 281         cookie.stat_info.st_ex_mask = fsp->fsp_name->st.st_ex_mask;
 282         cookie.stat_info.vfs_private = fsp->fsp_name->st.vfs_private;
 283
 284         ndr_err = ndr_push_struct_blob(&new_cookie_blob, mem_ctx, &cookie,
 285                         (ndr_push_flags_fn_t)ndr_push_vfs_default_durable_cookie);
 286         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 287                 status = ndr_map_error2ntstatus(ndr_err);
 288                 return status;
 289         }
 290
 291         status = fd_close(fsp);
 292         if (!NT_STATUS_IS_OK(status)) {
 293                 data_blob_free(&new_cookie_blob);
 294                 return status;
 295         }
 296
 297         *new_cookie = new_cookie_blob;
 298         return NT_STATUS_OK;
 299 }
 300
 301
 302 /**
 303  * Check whether a cookie-stored struct info is the same
 304  * as a given SMB_STRUCT_STAT, as coming with the fsp.
 305  */
 306 static bool vfs_default_durable_reconnect_check_stat(
 307                                 struct vfs_default_durable_stat *cookie_st,
 308                                 SMB_STRUCT_STAT *fsp_st,
 309                                 const char *name)
 310 {
 311         int ret;
 312
 313         if (cookie_st->st_ex_dev != fsp_st->st_ex_dev) {
 314                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 315                           "stat_ex.%s differs: "
 316                           "cookie:%llu != stat:%llu, "
 317                           "denying durable reconnect\n",
 318                           name,
 319                           "st_ex_dev",
 320                           (unsigned long long)cookie_st->st_ex_dev,
 321                           (unsigned long long)fsp_st->st_ex_dev));
 322                 return false;
 323         }
 324
 325         if (cookie_st->st_ex_ino != fsp_st->st_ex_ino) {
 326                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 327                           "stat_ex.%s differs: "
 328                           "cookie:%llu != stat:%llu, "
 329                           "denying durable reconnect\n",
 330                           name,
 331                           "st_ex_ino",
 332                           (unsigned long long)cookie_st->st_ex_ino,
 333                           (unsigned long long)fsp_st->st_ex_ino));
 334                 return false;
 335         }
 336
 337         if (cookie_st->st_ex_mode != fsp_st->st_ex_mode) {
 338                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 339                           "stat_ex.%s differs: "
 340                           "cookie:%llu != stat:%llu, "
 341                           "denying durable reconnect\n",
 342                           name,
 343                           "st_ex_mode",
 344                           (unsigned long long)cookie_st->st_ex_mode,
 345                           (unsigned long long)fsp_st->st_ex_mode));
 346                 return false;
 347         }
 348
 349         if (cookie_st->st_ex_nlink != fsp_st->st_ex_nlink) {
 350                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 351                           "stat_ex.%s differs: "
 352                           "cookie:%llu != stat:%llu, "
 353                           "denying durable reconnect\n",
 354                           name,
 355                           "st_ex_nlink",
 356                           (unsigned long long)cookie_st->st_ex_nlink,
 357                           (unsigned long long)fsp_st->st_ex_nlink));
 358                 return false;
 359         }
 360
 361         if (cookie_st->st_ex_uid != fsp_st->st_ex_uid) {
 362                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 363                           "stat_ex.%s differs: "
 364                           "cookie:%llu != stat:%llu, "
 365                           "denying durable reconnect\n",
 366                           name,
 367                           "st_ex_uid",
 368                           (unsigned long long)cookie_st->st_ex_uid,
 369                           (unsigned long long)fsp_st->st_ex_uid));
 370                 return false;
 371         }
 372
 373         if (cookie_st->st_ex_gid != fsp_st->st_ex_gid) {
 374                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 375                           "stat_ex.%s differs: "
 376                           "cookie:%llu != stat:%llu, "
 377                           "denying durable reconnect\n",
 378                           name,
 379                           "st_ex_gid",
 380                           (unsigned long long)cookie_st->st_ex_gid,
 381                           (unsigned long long)fsp_st->st_ex_gid));
 382                 return false;
 383         }
 384
 385         if (cookie_st->st_ex_rdev != fsp_st->st_ex_rdev) {
 386                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 387                           "stat_ex.%s differs: "
 388                           "cookie:%llu != stat:%llu, "
 389                           "denying durable reconnect\n",
 390                           name,
 391                           "st_ex_rdev",
 392                           (unsigned long long)cookie_st->st_ex_rdev,
 393                           (unsigned long long)fsp_st->st_ex_rdev));
 394                 return false;
 395         }
 396
 397         if (cookie_st->st_ex_size != fsp_st->st_ex_size) {
 398                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 399                           "stat_ex.%s differs: "
 400                           "cookie:%llu != stat:%llu, "
 401                           "denying durable reconnect\n",
 402                           name,
 403                           "st_ex_size",
 404                           (unsigned long long)cookie_st->st_ex_size,
 405                           (unsigned long long)fsp_st->st_ex_size));
 406                 return false;
 407         }
 408
 409         ret = timespec_compare(&cookie_st->st_ex_atime,
 410                                &fsp_st->st_ex_atime);
 411         if (ret != 0) {
 412                 struct timeval tc, ts;
 413                 tc = convert_timespec_to_timeval(cookie_st->st_ex_atime);
 414                 ts = convert_timespec_to_timeval(fsp_st->st_ex_atime);
 415
 416                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 417                           "stat_ex.%s differs: "
 418                           "cookie:'%s' != stat:'%s', "
 419                           "denying durable reconnect\n",
 420                           name,
 421                           "st_ex_atime",
 422                           timeval_string(talloc_tos(), &tc, true),
 423                           timeval_string(talloc_tos(), &ts, true)));
 424                 return false;
 425         }
 426
 427         ret = timespec_compare(&cookie_st->st_ex_mtime,
 428                                &fsp_st->st_ex_mtime);
 429         if (ret != 0) {
 430                 struct timeval tc, ts;
 431                 tc = convert_timespec_to_timeval(cookie_st->st_ex_mtime);
 432                 ts = convert_timespec_to_timeval(fsp_st->st_ex_mtime);
 433
 434                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 435                           "stat_ex.%s differs: "
 436                           "cookie:'%s' != stat:'%s', "
 437                           "denying durable reconnect\n",
 438                           name,
 439                           "st_ex_mtime",
 440                           timeval_string(talloc_tos(), &tc, true),
 441                           timeval_string(talloc_tos(), &ts, true)));
 442                 return false;
 443         }
 444
 445         ret = timespec_compare(&cookie_st->st_ex_ctime,
 446                                &fsp_st->st_ex_ctime);
 447         if (ret != 0) {
 448                 struct timeval tc, ts;
 449                 tc = convert_timespec_to_timeval(cookie_st->st_ex_ctime);
 450                 ts = convert_timespec_to_timeval(fsp_st->st_ex_ctime);
 451
 452                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 453                           "stat_ex.%s differs: "
 454                           "cookie:'%s' != stat:'%s', "
 455                           "denying durable reconnect\n",
 456                           name,
 457                           "st_ex_ctime",
 458                           timeval_string(talloc_tos(), &tc, true),
 459                           timeval_string(talloc_tos(), &ts, true)));
 460                 return false;
 461         }
 462
 463         ret = timespec_compare(&cookie_st->st_ex_btime,
 464                                &fsp_st->st_ex_btime);
 465         if (ret != 0) {
 466                 struct timeval tc, ts;
 467                 tc = convert_timespec_to_timeval(cookie_st->st_ex_btime);
 468                 ts = convert_timespec_to_timeval(fsp_st->st_ex_btime);
 469
 470                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 471                           "stat_ex.%s differs: "
 472                           "cookie:'%s' != stat:'%s', "
 473                           "denying durable reconnect\n",
 474                           name,
 475                           "st_ex_btime",
 476                           timeval_string(talloc_tos(), &tc, true),
 477                           timeval_string(talloc_tos(), &ts, true)));
 478                 return false;
 479         }
 480
 481         if (cookie_st->st_ex_calculated_birthtime !=
 482             fsp_st->st_ex_calculated_birthtime)
 483         {
 484                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 485                           "stat_ex.%s differs: "
 486                           "cookie:%llu != stat:%llu, "
 487                           "denying durable reconnect\n",
 488                           name,
 489                           "st_ex_calculated_birthtime",
 490                           (unsigned long long)cookie_st->st_ex_calculated_birthtime,
 491                           (unsigned long long)fsp_st->st_ex_calculated_birthtime));
 492                 return false;
 493         }
 494
 495         if (cookie_st->st_ex_blksize != fsp_st->st_ex_blksize) {
 496                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 497                           "stat_ex.%s differs: "
 498                           "cookie:%llu != stat:%llu, "
 499                           "denying durable reconnect\n",
 500                           name,
 501                           "st_ex_blksize",
 502                           (unsigned long long)cookie_st->st_ex_blksize,
 503                           (unsigned long long)fsp_st->st_ex_blksize));
 504                 return false;
 505         }
 506
 507         if (cookie_st->st_ex_blocks != fsp_st->st_ex_blocks) {
 508                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 509                           "stat_ex.%s differs: "
 510                           "cookie:%llu != stat:%llu, "
 511                           "denying durable reconnect\n",
 512                           name,
 513                           "st_ex_blocks",
 514                           (unsigned long long)cookie_st->st_ex_blocks,
 515                           (unsigned long long)fsp_st->st_ex_blocks));
 516                 return false;
 517         }
 518
 519         if (cookie_st->st_ex_flags != fsp_st->st_ex_flags) {
 520                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 521                           "stat_ex.%s differs: "
 522                           "cookie:%llu != stat:%llu, "
 523                           "denying durable reconnect\n",
 524                           name,
 525                           "st_ex_flags",
 526                           (unsigned long long)cookie_st->st_ex_flags,
 527                           (unsigned long long)fsp_st->st_ex_flags));
 528                 return false;
 529         }
 530
 531         if (cookie_st->st_ex_mask != fsp_st->st_ex_mask) {
 532                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 533                           "stat_ex.%s differs: "
 534                           "cookie:%llu != stat:%llu, "
 535                           "denying durable reconnect\n",
 536                           name,
 537                           "st_ex_mask",
 538                           (unsigned long long)cookie_st->st_ex_mask,
 539                           (unsigned long long)fsp_st->st_ex_mask));
 540                 return false;
 541         }
 542
 543         if (cookie_st->vfs_private != fsp_st->vfs_private) {
 544                 DEBUG(1, ("vfs_default_durable_reconnect (%s): "
 545                           "stat_ex.%s differs: "
 546                           "cookie:%llu != stat:%llu, "
 547                           "denying durable reconnect\n",
 548                           name,
 549                           "vfs_private",
 550                           (unsigned long long)cookie_st->vfs_private,
 551                           (unsigned long long)fsp_st->vfs_private));
 552                 return false;
 553         }
 554
 555         return true;
 556 }
 557
 558 NTSTATUS vfs_default_durable_reconnect(struct connection_struct *conn,
 559                                        struct smb_request *smb1req,
 560                                        struct smbXsrv_open *op,
 561                                        const DATA_BLOB old_cookie,
 562                                        TALLOC_CTX *mem_ctx,
 563                                        files_struct **result,
 564                                        DATA_BLOB *new_cookie)
 565 {
 566         struct share_mode_lock *lck;
 567         struct share_mode_entry *e;
 568         struct files_struct *fsp = NULL;
 569         NTSTATUS status;
 570         bool ok;
 571         int ret;
 572         int flags = 0;
 573         struct file_id file_id;
 574         struct smb_filename *smb_fname = NULL;
 575         enum ndr_err_code ndr_err;
 576         struct vfs_default_durable_cookie cookie;
 577         DATA_BLOB new_cookie_blob = data_blob_null;
 578
 579         *result = NULL;
 580         *new_cookie = data_blob_null;
 581
 582         if (!lp_durable_handles(SNUM(conn))) {
 583                 return NT_STATUS_NOT_SUPPORTED;
 584         }
 585
 586         /*
 587          * the checks for kernel oplocks
 588          * and similar things are done
 589          * in the vfs_default_durable_cookie()
 590          * call below.
 591          */
 592
 593         ZERO_STRUCT(cookie);
 594
 595         ndr_err = ndr_pull_struct_blob(&old_cookie, talloc_tos(), &cookie,
 596                         (ndr_pull_flags_fn_t)ndr_pull_vfs_default_durable_cookie);
 597         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 598                 status = ndr_map_error2ntstatus(ndr_err);
 599                 return status;
 600         }
 601
 602         if (strcmp(cookie.magic, VFS_DEFAULT_DURABLE_COOKIE_MAGIC) != 0) {
 603                 return NT_STATUS_INVALID_PARAMETER;
 604         }
 605
 606         if (cookie.version != VFS_DEFAULT_DURABLE_COOKIE_VERSION) {
 607                 return NT_STATUS_INVALID_PARAMETER;
 608         }
 609
 610         if (!cookie.allow_reconnect) {
 611                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 612         }
 613
 614         if (strcmp(cookie.servicepath, conn->connectpath) != 0) {
 615                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 616         }
 617
 618         /* Create an smb_filename with stream_name == NULL. */
 619         status = create_synthetic_smb_fname(talloc_tos(),
 620                                             cookie.base_name,
 621                                             NULL, NULL,
 622                                             &smb_fname);
 623         if (!NT_STATUS_IS_OK(status)) {
 624                 return status;
 625         }
 626
 627         ret = SMB_VFS_LSTAT(conn, smb_fname);
 628         if (ret == -1) {
 629                 status = map_nt_error_from_unix_common(errno);
 630                 DEBUG(1, ("Unable to lstat stream: %s => %s\n",
 631                           smb_fname_str_dbg(smb_fname),
 632                           nt_errstr(status)));
 633                 return status;
 634         }
 635
 636         if (!S_ISREG(smb_fname->st.st_ex_mode)) {
 637                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 638         }
 639
 640         file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
 641         if (!file_id_equal(&cookie.id, &file_id)) {
 642                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 643         }
 644
 645         /*
 646          * 1. check entry in locking.tdb
 647          */
 648
 649         lck = get_existing_share_mode_lock(mem_ctx, file_id);
 650         if (lck == NULL) {
 651                 DEBUG(5, ("vfs_default_durable_reconnect: share-mode lock "
 652                            "not obtained from db\n"));
 653                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 654         }
 655
 656         if (lck->data->num_share_modes == 0) {
 657                 DEBUG(1, ("vfs_default_durable_reconnect: Error: no share-mode "
 658                           "entry in existing share mode lock\n"));
 659                 TALLOC_FREE(lck);
 660                 return NT_STATUS_INTERNAL_DB_ERROR;
 661         }
 662
 663         if (lck->data->num_share_modes > 1) {
 664                 /*
 665                  * It can't be durable if there is more than one handle
 666                  * on the file.
 667                  */
 668                 DEBUG(5, ("vfs_default_durable_reconnect: more than one "
 669                           "share-mode entry - can not be durable\n"));
 670                 TALLOC_FREE(lck);
 671                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 672         }
 673
 674         e = &lck->data->share_modes[0];
 675
 676         if (!server_id_is_disconnected(&e->pid)) {
 677                 DEBUG(5, ("vfs_default_durable_reconnect: denying durable "
 678                           "reconnect for handle that was not marked "
 679                           "disconnected (e.g. smbd or cluster node died)\n"));
 680                 TALLOC_FREE(lck);
 681                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 682         }
 683
 684         if (e->share_file_id != op->global->open_persistent_id) {
 685                 DEBUG(5, ("vfs_default_durable_reconnect: denying durable "
 686                           "share_file_id changed %llu != %llu"
 687                           "(e.g. another client had opened the file)\n",
 688                           (unsigned long long)e->share_file_id,
 689                           (unsigned long long)op->global->open_persistent_id));
 690                 TALLOC_FREE(lck);
 691                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 692         }
 693
 694         if ((e->access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA)) &&
 695             !CAN_WRITE(conn))
 696         {
 697                 DEBUG(5, ("vfs_default_durable_reconnect: denying durable "
 698                           "share[%s] is not writeable anymore\n",
 699                           lp_servicename(talloc_tos(), SNUM(conn))));
 700                 TALLOC_FREE(lck);
 701                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 702         }
 703
 704         /*
 705          * TODO:
 706          * add scavenger timer functionality
 707          *
 708          * For now we always allow the reconnect
 709          */
 710 #if 0
 711         expire_time = op->global->disconnect_time;
 712         expire_time += NTTIME_MAGIC(op->global->durable_timeout_msec);
 713         if (expire < now) {
 714                 //TODO reopen and close before telling the client...
 715         }
 716 #endif
 717
 718         /*
 719          * 2. proceed with opening file
 720          */
 721
 722         status = fsp_new(conn, conn, &fsp);
 723         if (!NT_STATUS_IS_OK(status)) {
 724                 DEBUG(0, ("vfs_default_durable_reconnect: failed to create "
 725                           "new fsp: %s\n", nt_errstr(status)));
 726                 TALLOC_FREE(lck);
 727                 return status;
 728         }
 729
 730         fsp->fh->private_options = e->private_options;
 731         fsp->fh->gen_id = smbXsrv_open_hash(op);
 732         fsp->file_id = file_id;
 733         fsp->file_pid = smb1req->smbpid;
 734         fsp->vuid = smb1req->vuid;
 735         fsp->open_time = e->time;
 736         fsp->access_mask = e->access_mask;
 737         fsp->share_access = e->share_access;
 738         fsp->can_read = ((fsp->access_mask & (FILE_READ_DATA)) != 0);
 739         fsp->can_write = ((fsp->access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA)) != 0);
 740
 741         /*
 742          * TODO:
 743          * Do we need to store the modified flag in the DB?
 744          * How to handle update_write_time and friends
 745          * during a disconnected client on a durable handle?
 746          */
 747         fsp->modified = false;
 748         /*
 749          * no durables for directories
 750          */
 751         fsp->is_directory = false;
 752         /*
 753          * For normal files, can_lock == !is_directory
 754          */
 755         fsp->can_lock = true;
 756         /*
 757          * We do not support aio write behind for smb2
 758          */
 759         fsp->aio_write_behind = false;
 760         fsp->oplock_type = e->op_type;
 761
 762         fsp->initial_allocation_size = cookie.initial_allocation_size;
 763         fsp->fh->position_information = cookie.position_information;
 764         fsp->update_write_time_triggered = cookie.update_write_time_triggered;
 765         fsp->update_write_time_on_close = cookie.update_write_time_on_close;
 766         fsp->write_time_forced = cookie.write_time_forced;
 767         fsp->close_write_time = cookie.close_write_time;
 768
 769         status = fsp_set_smb_fname(fsp, smb_fname);
 770         if (!NT_STATUS_IS_OK(status)) {
 771                 TALLOC_FREE(lck);
 772                 fsp_free(fsp);
 773                 DEBUG(0, ("vfs_default_durable_reconnect: "
 774                           "fsp_set_smb_fname failed: %s\n",
 775                           nt_errstr(status)));
 776                 return status;
 777         }
 778
 779         op->compat = fsp;
 780         fsp->op = op;
 781
 782         e->pid = messaging_server_id(conn->sconn->msg_ctx);
 783         e->op_mid = smb1req->mid;
 784         e->share_file_id = fsp->fh->gen_id;
 785
 786         ok = brl_reconnect_disconnected(fsp);
 787         if (!ok) {
 788                 status = NT_STATUS_INTERNAL_ERROR;
 789                 DEBUG(1, ("vfs_default_durable_reconnect: "
 790                           "failed to reopen brlocks: %s\n",
 791                           nt_errstr(status)));
 792                 TALLOC_FREE(lck);
 793                 op->compat = NULL;
 794                 fsp_free(fsp);
 795                 return status;
 796         }
 797
 798         /*
 799          * TODO: properly calculate open flags
 800          */
 801         if (fsp->can_write && fsp->can_read) {
 802                 flags = O_RDWR;
 803         } else if (fsp->can_write) {
 804                 flags = O_WRONLY;
 805         } else if (fsp->can_read) {
 806                 flags = O_RDONLY;
 807         }
 808
 809         status = fd_open(conn, fsp, flags, 0 /* mode */);
 810         if (!NT_STATUS_IS_OK(status)) {
 811                 TALLOC_FREE(lck);
 812                 DEBUG(1, ("vfs_default_durable_reconnect: failed to open "
 813                           "file: %s\n", nt_errstr(status)));
 814                 op->compat = NULL;
 815                 fsp_free(fsp);
 816                 return status;
 817         }
 818
 819         /*
 820          * We now check the stat info stored in the cookie against
 821          * the current stat data from the file we just opened.
 822          * If any detail differs, we deny the durable reconnect,
 823          * because in that case it is very likely that someone
 824          * opened the file while the handle was disconnected,
 825          * which has to be interpreted as an oplock break.
 826          */
 827
 828         ret = SMB_VFS_FSTAT(fsp, &fsp->fsp_name->st);
 829         if (ret == -1) {
 830                 status = map_nt_error_from_unix_common(errno);
 831                 DEBUG(1, ("Unable to fstat stream: %s => %s\n",
 832                           smb_fname_str_dbg(smb_fname),
 833                           nt_errstr(status)));
 834                 ret = SMB_VFS_CLOSE(fsp);
 835                 if (ret == -1) {
 836                         DEBUG(0, ("vfs_default_durable_reconnect: "
 837                                   "SMB_VFS_CLOSE failed (%s) - leaking file "
 838                                   "descriptor\n", strerror(errno)));
 839                 }
 840                 TALLOC_FREE(lck);
 841                 op->compat = NULL;
 842                 fsp_free(fsp);
 843                 return status;
 844         }
 845
 846         if (!S_ISREG(fsp->fsp_name->st.st_ex_mode)) {
 847                 ret = SMB_VFS_CLOSE(fsp);
 848                 if (ret == -1) {
 849                         DEBUG(0, ("vfs_default_durable_reconnect: "
 850                                   "SMB_VFS_CLOSE failed (%s) - leaking file "
 851                                   "descriptor\n", strerror(errno)));
 852                 }
 853                 TALLOC_FREE(lck);
 854                 op->compat = NULL;
 855                 fsp_free(fsp);
 856                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 857         }
 858
 859         file_id = vfs_file_id_from_sbuf(conn, &fsp->fsp_name->st);
 860         if (!file_id_equal(&cookie.id, &file_id)) {
 861                 ret = SMB_VFS_CLOSE(fsp);
 862                 if (ret == -1) {
 863                         DEBUG(0, ("vfs_default_durable_reconnect: "
 864                                   "SMB_VFS_CLOSE failed (%s) - leaking file "
 865                                   "descriptor\n", strerror(errno)));
 866                 }
 867                 TALLOC_FREE(lck);
 868                 op->compat = NULL;
 869                 fsp_free(fsp);
 870                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 871         }
 872
 873         ok = vfs_default_durable_reconnect_check_stat(&cookie.stat_info,
 874                                                       &fsp->fsp_name->st,
 875                                                       fsp_str_dbg(fsp));
 876         if (!ok) {
 877                 ret = SMB_VFS_CLOSE(fsp);
 878                 if (ret == -1) {
 879                         DEBUG(0, ("vfs_default_durable_reconnect: "
 880                                   "SMB_VFS_CLOSE failed (%s) - leaking file "
 881                                   "descriptor\n", strerror(errno)));
 882                 }
 883                 TALLOC_FREE(lck);
 884                 op->compat = NULL;
 885                 fsp_free(fsp);
 886                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 887         }
 888
 889         status = set_file_oplock(fsp, e->op_type);
 890         if (!NT_STATUS_IS_OK(status)) {
 891                 DEBUG(1, ("vfs_default_durable_reconnect failed to set oplock "
 892                           "after opening file: %s\n", nt_errstr(status)));
 893                 ret = SMB_VFS_CLOSE(fsp);
 894                 if (ret == -1) {
 895                         DEBUG(0, ("vfs_default_durable_reconnect: "
 896                                   "SMB_VFS_CLOSE failed (%s) - leaking file "
 897                                   "descriptor\n", strerror(errno)));
 898                 }
 899                 TALLOC_FREE(lck);
 900                 op->compat = NULL;
 901                 fsp_free(fsp);
 902                 return status;
 903         }
 904
 905         status = vfs_default_durable_cookie(fsp, mem_ctx, &new_cookie_blob);
 906         if (!NT_STATUS_IS_OK(status)) {
 907                 TALLOC_FREE(lck);
 908                 DEBUG(1, ("vfs_default_durable_reconnect: "
 909                           "vfs_default_durable_cookie - %s\n",
 910                           nt_errstr(status)));
 911                 op->compat = NULL;
 912                 fsp_free(fsp);
 913                 return status;
 914         }
 915
 916         smb1req->chain_fsp = fsp;
 917         smb1req->smb2req->compat_chain_fsp = fsp;
 918
 919         DEBUG(10, ("vfs_default_durable_reconnect: opened file '%s'\n",
 920                    fsp_str_dbg(fsp)));
 921
 922         /*
 923          * release the sharemode lock: this writes the changes
 924          */
 925         lck->data->modified = true;
 926         TALLOC_FREE(lck);
 927
 928         *result = fsp;
 929         *new_cookie = new_cookie_blob;
 930
 931         return NT_STATUS_OK;
 932 }