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