source4/ntvfs/posix/vfs_posix.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    POSIX NTVFS backend
   5
   6    Copyright (C) Andrew Tridgell 2004
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21 /*
  22   this implements most of the POSIX NTVFS backend
  23   This is the default backend
  24 */
  25
  26 #include "includes.h"
  27 #include "vfs_posix.h"
  28 #include "librpc/gen_ndr/security.h"
  29 #include "tdb_compat.h"
  30 #include "lib/tdb_wrap/tdb_wrap.h"
  31 #include "libcli/security/security.h"
  32 #include "lib/events/events.h"
  33 #include "param/param.h"
  34
  35 /*
  36   setup config options for a posix share
  37 */
  38 static void pvfs_setup_options(struct pvfs_state *pvfs)
  39 {
  40         struct share_config *scfg = pvfs->ntvfs->ctx->config;
  41         const char *eadb;
  42         bool def_perm_override = false;
  43
  44         if (share_bool_option(scfg, SHARE_MAP_HIDDEN, SHARE_MAP_HIDDEN_DEFAULT))
  45                 pvfs->flags |= PVFS_FLAG_MAP_HIDDEN;
  46         if (share_bool_option(scfg, SHARE_MAP_ARCHIVE, SHARE_MAP_ARCHIVE_DEFAULT))
  47                 pvfs->flags |= PVFS_FLAG_MAP_ARCHIVE;
  48         if (share_bool_option(scfg, SHARE_MAP_SYSTEM, SHARE_MAP_SYSTEM_DEFAULT))
  49                 pvfs->flags |= PVFS_FLAG_MAP_SYSTEM;
  50         if (share_bool_option(scfg, SHARE_READONLY, SHARE_READONLY_DEFAULT))
  51                 pvfs->flags |= PVFS_FLAG_READONLY;
  52         if (share_bool_option(scfg, SHARE_STRICT_SYNC, SHARE_STRICT_SYNC_DEFAULT))
  53                 pvfs->flags |= PVFS_FLAG_STRICT_SYNC;
  54         if (share_bool_option(scfg, SHARE_STRICT_LOCKING, SHARE_STRICT_LOCKING_DEFAULT))
  55                 pvfs->flags |= PVFS_FLAG_STRICT_LOCKING;
  56         if (share_bool_option(scfg, SHARE_CI_FILESYSTEM, SHARE_CI_FILESYSTEM_DEFAULT))
  57                 pvfs->flags |= PVFS_FLAG_CI_FILESYSTEM;
  58         if (share_bool_option(scfg, PVFS_FAKE_OPLOCKS, PVFS_FAKE_OPLOCKS_DEFAULT))
  59                 pvfs->flags |= PVFS_FLAG_FAKE_OPLOCKS;
  60         if (share_bool_option(scfg, PVFS_AIO, false))
  61                 pvfs->flags |= PVFS_FLAG_LINUX_AIO;
  62
  63 #if defined(O_DIRECTORY) && defined(O_NOFOLLOW)
  64         /* set PVFS_PERM_OVERRIDE by default only if the system
  65          * supports the necessary capabilities to make it secure
  66          */
  67         def_perm_override = true;
  68 #endif
  69         if (share_bool_option(scfg, PVFS_PERM_OVERRIDE, def_perm_override))
  70                 pvfs->flags |= PVFS_FLAG_PERM_OVERRIDE;
  71
  72         /* file perm options */
  73         pvfs->options.create_mask       = share_int_option(scfg,
  74                                                            SHARE_CREATE_MASK,
  75                                                            SHARE_CREATE_MASK_DEFAULT);
  76         pvfs->options.dir_mask          = share_int_option(scfg,
  77                                                            SHARE_DIR_MASK,
  78                                                            SHARE_DIR_MASK_DEFAULT);
  79         pvfs->options.force_dir_mode    = share_int_option(scfg,
  80                                                            SHARE_FORCE_DIR_MODE,
  81                                                            SHARE_FORCE_DIR_MODE_DEFAULT);
  82         pvfs->options.force_create_mode = share_int_option(scfg,
  83                                                            SHARE_FORCE_CREATE_MODE,
  84                                                            SHARE_FORCE_CREATE_MODE_DEFAULT);
  85         /* this must be a power of 2 */
  86         pvfs->alloc_size_rounding = share_int_option(scfg,
  87                                                         PVFS_ALLOCATION_ROUNDING,
  88                                                         PVFS_ALLOCATION_ROUNDING_DEFAULT);
  89
  90         pvfs->search.inactivity_time = share_int_option(scfg,
  91                                                         PVFS_SEARCH_INACTIVITY,
  92                                                         PVFS_SEARCH_INACTIVITY_DEFAULT);
  93
  94 #if HAVE_XATTR_SUPPORT
  95         if (share_bool_option(scfg, PVFS_XATTR, PVFS_XATTR_DEFAULT))
  96                 pvfs->flags |= PVFS_FLAG_XATTR_ENABLE;
  97 #endif
  98
  99         pvfs->sharing_violation_delay = share_int_option(scfg,
 100                                                         PVFS_SHARE_DELAY,
 101                                                         PVFS_SHARE_DELAY_DEFAULT);
 102
 103         pvfs->oplock_break_timeout = share_int_option(scfg,
 104                                                       PVFS_OPLOCK_TIMEOUT,
 105                                                       PVFS_OPLOCK_TIMEOUT_DEFAULT);
 106
 107         pvfs->writetime_delay = share_int_option(scfg,
 108                                                  PVFS_WRITETIME_DELAY,
 109                                                  PVFS_WRITETIME_DELAY_DEFAULT);
 110
 111         pvfs->share_name = talloc_strdup(pvfs, scfg->name);
 112
 113         pvfs->fs_attribs =
 114                 FS_ATTR_CASE_SENSITIVE_SEARCH |
 115                 FS_ATTR_CASE_PRESERVED_NAMES |
 116                 FS_ATTR_UNICODE_ON_DISK |
 117                 FS_ATTR_SPARSE_FILES;
 118
 119         /* allow xattrs to be stored in a external tdb */
 120         eadb = share_string_option(scfg, PVFS_EADB, NULL);
 121         if (eadb != NULL) {
 122                 pvfs->ea_db = tdb_wrap_open(pvfs, eadb, 50000,
 123                                             TDB_DEFAULT, O_RDWR|O_CREAT, 0600,
 124                                             pvfs->ntvfs->ctx->lp_ctx);
 125                 if (pvfs->ea_db != NULL) {
 126                         pvfs->flags |= PVFS_FLAG_XATTR_ENABLE;
 127                 } else {
 128                         DEBUG(0,("Failed to open eadb '%s' - %s\n",
 129                                  eadb, strerror(errno)));
 130                         pvfs->flags &= ~PVFS_FLAG_XATTR_ENABLE;
 131                 }
 132         }
 133
 134         if (pvfs->flags & PVFS_FLAG_XATTR_ENABLE) {
 135                 pvfs->fs_attribs |= FS_ATTR_NAMED_STREAMS;
 136         }
 137         if (pvfs->flags & PVFS_FLAG_XATTR_ENABLE) {
 138                 pvfs->fs_attribs |= FS_ATTR_PERSISTANT_ACLS;
 139         }
 140
 141         pvfs->sid_cache.creator_owner = dom_sid_parse_talloc(pvfs, SID_CREATOR_OWNER);
 142         pvfs->sid_cache.creator_group = dom_sid_parse_talloc(pvfs, SID_CREATOR_GROUP);
 143
 144         /* check if the system really supports xattrs */
 145         if (pvfs->flags & PVFS_FLAG_XATTR_ENABLE) {
 146                 pvfs_xattr_probe(pvfs);
 147         }
 148
 149         /* enable an ACL backend */
 150         pvfs->acl_ops = pvfs_acl_backend_byname(share_string_option(scfg, PVFS_ACL, "xattr"));
 151 }
 152
 153 static int pvfs_state_destructor(struct pvfs_state *pvfs)
 154 {
 155         struct pvfs_file *f, *fn;
 156         struct pvfs_search_state *s, *sn;
 157
 158         /*
 159          * make sure we cleanup files and searches before anything else
 160          * because there destructors need to acess the pvfs_state struct
 161          */
 162         for (f=pvfs->files.list; f; f=fn) {
 163                 fn = f->next;
 164                 talloc_free(f);
 165         }
 166
 167         for (s=pvfs->search.list; s; s=sn) {
 168                 sn = s->next;
 169                 talloc_free(s);
 170         }
 171
 172         return 0;
 173 }
 174
 175 /*
 176   connect to a share - used when a tree_connect operation comes
 177   in. For a disk based backend we needs to ensure that the base
 178   directory exists (tho it doesn't need to be accessible by the user,
 179   that comes later)
 180 */
 181 static NTSTATUS pvfs_connect(struct ntvfs_module_context *ntvfs,
 182                              struct ntvfs_request *req,
 183                              union smb_tcon* tcon)
 184 {
 185         struct pvfs_state *pvfs;
 186         struct stat st;
 187         char *base_directory;
 188         NTSTATUS status;
 189         const char *sharename;
 190
 191         switch (tcon->generic.level) {
 192         case RAW_TCON_TCON:
 193                 sharename = tcon->tcon.in.service;
 194                 break;
 195         case RAW_TCON_TCONX:
 196                 sharename = tcon->tconx.in.path;
 197                 break;
 198         case RAW_TCON_SMB2:
 199                 sharename = tcon->smb2.in.path;
 200                 break;
 201         default:
 202                 return NT_STATUS_INVALID_LEVEL;
 203         }
 204
 205         if (strncmp(sharename, "\\\\", 2) == 0) {
 206                 char *p = strchr(sharename+2, '\\');
 207                 if (p) {
 208                         sharename = p + 1;
 209                 }
 210         }
 211
 212         /*
 213          * TODO: call this from ntvfs_posix_init()
 214          *       but currently we don't have a lp_ctx there
 215          */
 216         status = pvfs_acl_init();
 217         NT_STATUS_NOT_OK_RETURN(status);
 218
 219         pvfs = talloc_zero(ntvfs, struct pvfs_state);
 220         NT_STATUS_HAVE_NO_MEMORY(pvfs);
 221
 222         /* for simplicity of path construction, remove any trailing slash now */
 223         base_directory = talloc_strdup(pvfs, share_string_option(ntvfs->ctx->config, SHARE_PATH, ""));
 224         NT_STATUS_HAVE_NO_MEMORY(base_directory);
 225         if (strcmp(base_directory, "/") != 0) {
 226                 trim_string(base_directory, NULL, "/");
 227         }
 228
 229         pvfs->ntvfs = ntvfs;
 230         pvfs->base_directory = base_directory;
 231
 232         /* the directory must exist. Note that we deliberately don't
 233            check that it is readable */
 234         if (stat(pvfs->base_directory, &st) != 0 || !S_ISDIR(st.st_mode)) {
 235                 DEBUG(0,("pvfs_connect: '%s' is not a directory, when connecting to [%s]\n",
 236                          pvfs->base_directory, sharename));
 237                 return NT_STATUS_BAD_NETWORK_NAME;
 238         }
 239
 240         ntvfs->ctx->fs_type = talloc_strdup(ntvfs->ctx, "NTFS");
 241         NT_STATUS_HAVE_NO_MEMORY(ntvfs->ctx->fs_type);
 242
 243         ntvfs->ctx->dev_type = talloc_strdup(ntvfs->ctx, "A:");
 244         NT_STATUS_HAVE_NO_MEMORY(ntvfs->ctx->dev_type);
 245
 246         if (tcon->generic.level == RAW_TCON_TCONX) {
 247                 tcon->tconx.out.fs_type = ntvfs->ctx->fs_type;
 248                 tcon->tconx.out.dev_type = ntvfs->ctx->dev_type;
 249         }
 250
 251         ntvfs->private_data = pvfs;
 252
 253         pvfs->brl_context = brlock_init(pvfs,
 254                                      pvfs->ntvfs->ctx->server_id,
 255                                      pvfs->ntvfs->ctx->lp_ctx,
 256                                      pvfs->ntvfs->ctx->msg_ctx);
 257         if (pvfs->brl_context == NULL) {
 258                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 259         }
 260
 261         pvfs->odb_context = odb_init(pvfs, pvfs->ntvfs->ctx);
 262         if (pvfs->odb_context == NULL) {
 263                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 264         }
 265
 266         /* allow this to be NULL - we just disable change notify */
 267         pvfs->notify_context = notify_init(pvfs,
 268                                            pvfs->ntvfs->ctx->server_id,
 269                                            pvfs->ntvfs->ctx->msg_ctx,
 270                                            pvfs->ntvfs->ctx->lp_ctx,
 271                                            pvfs->ntvfs->ctx->event_ctx,
 272                                            pvfs->ntvfs->ctx->config);
 273
 274         pvfs->wbc_ctx = wbc_init(pvfs,
 275                                  pvfs->ntvfs->ctx->msg_ctx,
 276                                  pvfs->ntvfs->ctx->event_ctx);
 277         if (pvfs->wbc_ctx == NULL) {
 278                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 279         }
 280
 281         /* allocate the search handle -> ptr tree */
 282         pvfs->search.idtree = idr_init(pvfs);
 283         NT_STATUS_HAVE_NO_MEMORY(pvfs->search.idtree);
 284
 285         status = pvfs_mangle_init(pvfs);
 286         NT_STATUS_NOT_OK_RETURN(status);
 287
 288         pvfs_setup_options(pvfs);
 289
 290         talloc_set_destructor(pvfs, pvfs_state_destructor);
 291
 292 #ifdef SIGXFSZ
 293         /* who had the stupid idea to generate a signal on a large
 294            file write instead of just failing it!? */
 295         BlockSignals(true, SIGXFSZ);
 296 #endif
 297
 298         return NT_STATUS_OK;
 299 }
 300
 301 /*
 302   disconnect from a share
 303 */
 304 static NTSTATUS pvfs_disconnect(struct ntvfs_module_context *ntvfs)
 305 {
 306         return NT_STATUS_OK;
 307 }
 308
 309 /*
 310   check if a directory exists
 311 */
 312 static NTSTATUS pvfs_chkpath(struct ntvfs_module_context *ntvfs,
 313                              struct ntvfs_request *req,
 314                              union smb_chkpath *cp)
 315 {
 316         struct pvfs_state *pvfs = talloc_get_type(ntvfs->private_data,
 317                                   struct pvfs_state);
 318         struct pvfs_filename *name;
 319         NTSTATUS status;
 320
 321         /* resolve the cifs name to a posix name */
 322         status = pvfs_resolve_name(pvfs, req, cp->chkpath.in.path, 0, &name);
 323         NT_STATUS_NOT_OK_RETURN(status);
 324
 325         if (!name->exists) {
 326                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 327         }
 328
 329         if (!S_ISDIR(name->st.st_mode)) {
 330                 return NT_STATUS_NOT_A_DIRECTORY;
 331         }
 332
 333         return NT_STATUS_OK;
 334 }
 335
 336 /*
 337   copy a set of files
 338 */
 339 static NTSTATUS pvfs_copy(struct ntvfs_module_context *ntvfs,
 340                           struct ntvfs_request *req, struct smb_copy *cp)
 341 {
 342         DEBUG(0,("pvfs_copy not implemented\n"));
 343         return NT_STATUS_NOT_SUPPORTED;
 344 }
 345
 346 /*
 347   return print queue info
 348 */
 349 static NTSTATUS pvfs_lpq(struct ntvfs_module_context *ntvfs,
 350                          struct ntvfs_request *req, union smb_lpq *lpq)
 351 {
 352         return NT_STATUS_NOT_SUPPORTED;
 353 }
 354
 355 /* SMBtrans - not used on file shares */
 356 static NTSTATUS pvfs_trans(struct ntvfs_module_context *ntvfs,
 357                            struct ntvfs_request *req, struct smb_trans2 *trans2)
 358 {
 359         return NT_STATUS_ACCESS_DENIED;
 360 }
 361
 362 /*
 363   initialialise the POSIX disk backend, registering ourselves with the ntvfs subsystem
 364  */
 365 NTSTATUS ntvfs_posix_init(void)
 366 {
 367         NTSTATUS ret;
 368         struct ntvfs_ops ops;
 369         NTVFS_CURRENT_CRITICAL_SIZES(vers);
 370
 371         ZERO_STRUCT(ops);
 372
 373         ops.type = NTVFS_DISK;
 374
 375         /* fill in all the operations */
 376         ops.connect_fn = pvfs_connect;
 377         ops.disconnect_fn = pvfs_disconnect;
 378         ops.unlink_fn = pvfs_unlink;
 379         ops.chkpath_fn = pvfs_chkpath;
 380         ops.qpathinfo_fn = pvfs_qpathinfo;
 381         ops.setpathinfo_fn = pvfs_setpathinfo;
 382         ops.open_fn = pvfs_open;
 383         ops.mkdir_fn = pvfs_mkdir;
 384         ops.rmdir_fn = pvfs_rmdir;
 385         ops.rename_fn = pvfs_rename;
 386         ops.copy_fn = pvfs_copy;
 387         ops.ioctl_fn = pvfs_ioctl;
 388         ops.read_fn = pvfs_read;
 389         ops.write_fn = pvfs_write;
 390         ops.seek_fn = pvfs_seek;
 391         ops.flush_fn = pvfs_flush;
 392         ops.close_fn = pvfs_close;
 393         ops.exit_fn = pvfs_exit;
 394         ops.lock_fn = pvfs_lock;
 395         ops.setfileinfo_fn = pvfs_setfileinfo;
 396         ops.qfileinfo_fn = pvfs_qfileinfo;
 397         ops.fsinfo_fn = pvfs_fsinfo;
 398         ops.lpq_fn = pvfs_lpq;
 399         ops.search_first_fn = pvfs_search_first;
 400         ops.search_next_fn = pvfs_search_next;
 401         ops.search_close_fn = pvfs_search_close;
 402         ops.trans_fn = pvfs_trans;
 403         ops.logoff_fn = pvfs_logoff;
 404         ops.async_setup_fn = pvfs_async_setup;
 405         ops.cancel_fn = pvfs_cancel;
 406         ops.notify_fn = pvfs_notify;
 407
 408         /* register ourselves with the NTVFS subsystem. We register
 409            under the name 'default' as we wish to be the default
 410            backend, and also register as 'posix' */
 411         ops.name = "default";
 412         ret = ntvfs_register(&ops, &vers);
 413
 414         if (!NT_STATUS_IS_OK(ret)) {
 415                 DEBUG(0,("Failed to register POSIX backend as '%s'!\n", ops.name));
 416         }
 417
 418         ops.name = "posix";
 419         ret = ntvfs_register(&ops, &vers);
 420
 421         if (!NT_STATUS_IS_OK(ret)) {
 422                 DEBUG(0,("Failed to register POSIX backend as '%s'!\n", ops.name));
 423         }
 424
 425         if (NT_STATUS_IS_OK(ret)) {
 426                 ret = ntvfs_common_init();
 427         }
 428
 429         return ret;
 430 }