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 "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                 if (pvfs->ea_db != NULL) {
 125                         pvfs->flags |= PVFS_FLAG_XATTR_ENABLE;
 126                 } else {
 127                         DEBUG(0,("Failed to open eadb '%s' - %s\n",
 128                                  eadb, strerror(errno)));
 129                         pvfs->flags &= ~PVFS_FLAG_XATTR_ENABLE;
 130                 }
 131         }
 132
 133         if (pvfs->flags & PVFS_FLAG_XATTR_ENABLE) {
 134                 pvfs->fs_attribs |= FS_ATTR_NAMED_STREAMS;
 135         }
 136         if (pvfs->flags & PVFS_FLAG_XATTR_ENABLE) {
 137                 pvfs->fs_attribs |= FS_ATTR_PERSISTANT_ACLS;
 138         }
 139
 140         pvfs->sid_cache.creator_owner = dom_sid_parse_talloc(pvfs, SID_CREATOR_OWNER);
 141         pvfs->sid_cache.creator_group = dom_sid_parse_talloc(pvfs, SID_CREATOR_GROUP);
 142
 143         /* check if the system really supports xattrs */
 144         if (pvfs->flags & PVFS_FLAG_XATTR_ENABLE) {
 145                 pvfs_xattr_probe(pvfs);
 146         }
 147
 148         /* enable an ACL backend */
 149         pvfs->acl_ops = pvfs_acl_backend_byname(share_string_option(scfg, PVFS_ACL, "xattr"));
 150 }
 151
 152 static int pvfs_state_destructor(struct pvfs_state *pvfs)
 153 {
 154         struct pvfs_file *f, *fn;
 155         struct pvfs_search_state *s, *sn;
 156
 157         /*
 158          * make sure we cleanup files and searches before anything else
 159          * because there destructors need to acess the pvfs_state struct
 160          */
 161         for (f=pvfs->files.list; f; f=fn) {
 162                 fn = f->next;
 163                 talloc_free(f);
 164         }
 165
 166         for (s=pvfs->search.list; s; s=sn) {
 167                 sn = s->next;
 168                 talloc_free(s);
 169         }
 170
 171         return 0;
 172 }
 173
 174 /*
 175   connect to a share - used when a tree_connect operation comes
 176   in. For a disk based backend we needs to ensure that the base
 177   directory exists (tho it doesn't need to be accessible by the user,
 178   that comes later)
 179 */
 180 static NTSTATUS pvfs_connect(struct ntvfs_module_context *ntvfs,
 181                              struct ntvfs_request *req,
 182                              union smb_tcon* tcon)
 183 {
 184         struct pvfs_state *pvfs;
 185         struct stat st;
 186         char *base_directory;
 187         NTSTATUS status;
 188         const char *sharename;
 189
 190         switch (tcon->generic.level) {
 191         case RAW_TCON_TCON:
 192                 sharename = tcon->tcon.in.service;
 193                 break;
 194         case RAW_TCON_TCONX:
 195                 sharename = tcon->tconx.in.path;
 196                 break;
 197         case RAW_TCON_SMB2:
 198                 sharename = tcon->smb2.in.path;
 199                 break;
 200         default:
 201                 return NT_STATUS_INVALID_LEVEL;
 202         }
 203
 204         if (strncmp(sharename, "\\\\", 2) == 0) {
 205                 char *p = strchr(sharename+2, '\\');
 206                 if (p) {
 207                         sharename = p + 1;
 208                 }
 209         }
 210
 211         /*
 212          * TODO: call this from ntvfs_posix_init()
 213          *       but currently we don't have a lp_ctx there
 214          */
 215         status = pvfs_acl_init(ntvfs->ctx->lp_ctx);
 216         NT_STATUS_NOT_OK_RETURN(status);
 217
 218         pvfs = talloc_zero(ntvfs, struct pvfs_state);
 219         NT_STATUS_HAVE_NO_MEMORY(pvfs);
 220
 221         /* for simplicity of path construction, remove any trailing slash now */
 222         base_directory = talloc_strdup(pvfs, share_string_option(ntvfs->ctx->config, SHARE_PATH, ""));
 223         NT_STATUS_HAVE_NO_MEMORY(base_directory);
 224         if (strcmp(base_directory, "/") != 0) {
 225                 trim_string(base_directory, NULL, "/");
 226         }
 227
 228         pvfs->ntvfs = ntvfs;
 229         pvfs->base_directory = base_directory;
 230
 231         /* the directory must exist. Note that we deliberately don't
 232            check that it is readable */
 233         if (stat(pvfs->base_directory, &st) != 0 || !S_ISDIR(st.st_mode)) {
 234                 DEBUG(0,("pvfs_connect: '%s' is not a directory, when connecting to [%s]\n",
 235                          pvfs->base_directory, sharename));
 236                 return NT_STATUS_BAD_NETWORK_NAME;
 237         }
 238
 239         ntvfs->ctx->fs_type = talloc_strdup(ntvfs->ctx, "NTFS");
 240         NT_STATUS_HAVE_NO_MEMORY(ntvfs->ctx->fs_type);
 241
 242         ntvfs->ctx->dev_type = talloc_strdup(ntvfs->ctx, "A:");
 243         NT_STATUS_HAVE_NO_MEMORY(ntvfs->ctx->dev_type);
 244
 245         if (tcon->generic.level == RAW_TCON_TCONX) {
 246                 tcon->tconx.out.fs_type = ntvfs->ctx->fs_type;
 247                 tcon->tconx.out.dev_type = ntvfs->ctx->dev_type;
 248         }
 249
 250         ntvfs->private_data = pvfs;
 251
 252         pvfs->brl_context = brl_init(pvfs,
 253                                      pvfs->ntvfs->ctx->server_id,
 254                                      pvfs->ntvfs->ctx->lp_ctx,
 255                                      pvfs->ntvfs->ctx->msg_ctx);
 256         if (pvfs->brl_context == NULL) {
 257                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 258         }
 259
 260         pvfs->odb_context = odb_init(pvfs, pvfs->ntvfs->ctx);
 261         if (pvfs->odb_context == NULL) {
 262                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 263         }
 264
 265         /* allow this to be NULL - we just disable change notify */
 266         pvfs->notify_context = notify_init(pvfs,
 267                                            pvfs->ntvfs->ctx->server_id,
 268                                            pvfs->ntvfs->ctx->msg_ctx,
 269                                            pvfs->ntvfs->ctx->lp_ctx,
 270                                            pvfs->ntvfs->ctx->event_ctx,
 271                                            pvfs->ntvfs->ctx->config);
 272
 273         pvfs->wbc_ctx = wbc_init(pvfs,
 274                                  pvfs->ntvfs->ctx->msg_ctx,
 275                                  pvfs->ntvfs->ctx->event_ctx);
 276         if (pvfs->wbc_ctx == NULL) {
 277                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 278         }
 279
 280         /* allocate the search handle -> ptr tree */
 281         pvfs->search.idtree = idr_init(pvfs);
 282         NT_STATUS_HAVE_NO_MEMORY(pvfs->search.idtree);
 283
 284         status = pvfs_mangle_init(pvfs);
 285         NT_STATUS_NOT_OK_RETURN(status);
 286
 287         pvfs_setup_options(pvfs);
 288
 289         talloc_set_destructor(pvfs, pvfs_state_destructor);
 290
 291 #ifdef SIGXFSZ
 292         /* who had the stupid idea to generate a signal on a large
 293            file write instead of just failing it!? */
 294         BlockSignals(true, SIGXFSZ);
 295 #endif
 296
 297         return NT_STATUS_OK;
 298 }
 299
 300 /*
 301   disconnect from a share
 302 */
 303 static NTSTATUS pvfs_disconnect(struct ntvfs_module_context *ntvfs)
 304 {
 305         return NT_STATUS_OK;
 306 }
 307
 308 /*
 309   check if a directory exists
 310 */
 311 static NTSTATUS pvfs_chkpath(struct ntvfs_module_context *ntvfs,
 312                              struct ntvfs_request *req,
 313                              union smb_chkpath *cp)
 314 {
 315         struct pvfs_state *pvfs = talloc_get_type(ntvfs->private_data,
 316                                   struct pvfs_state);
 317         struct pvfs_filename *name;
 318         NTSTATUS status;
 319
 320         /* resolve the cifs name to a posix name */
 321         status = pvfs_resolve_name(pvfs, req, cp->chkpath.in.path, 0, &name);
 322         NT_STATUS_NOT_OK_RETURN(status);
 323
 324         if (!name->exists) {
 325                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 326         }
 327
 328         if (!S_ISDIR(name->st.st_mode)) {
 329                 return NT_STATUS_NOT_A_DIRECTORY;
 330         }
 331
 332         return NT_STATUS_OK;
 333 }
 334
 335 /*
 336   copy a set of files
 337 */
 338 static NTSTATUS pvfs_copy(struct ntvfs_module_context *ntvfs,
 339                           struct ntvfs_request *req, struct smb_copy *cp)
 340 {
 341         DEBUG(0,("pvfs_copy not implemented\n"));
 342         return NT_STATUS_NOT_SUPPORTED;
 343 }
 344
 345 /*
 346   return print queue info
 347 */
 348 static NTSTATUS pvfs_lpq(struct ntvfs_module_context *ntvfs,
 349                          struct ntvfs_request *req, union smb_lpq *lpq)
 350 {
 351         return NT_STATUS_NOT_SUPPORTED;
 352 }
 353
 354 /* SMBtrans - not used on file shares */
 355 static NTSTATUS pvfs_trans(struct ntvfs_module_context *ntvfs,
 356                            struct ntvfs_request *req, struct smb_trans2 *trans2)
 357 {
 358         return NT_STATUS_ACCESS_DENIED;
 359 }
 360
 361 /*
 362   initialialise the POSIX disk backend, registering ourselves with the ntvfs subsystem
 363  */
 364 NTSTATUS ntvfs_posix_init(void)
 365 {
 366         NTSTATUS ret;
 367         struct ntvfs_ops ops;
 368         NTVFS_CURRENT_CRITICAL_SIZES(vers);
 369
 370         ZERO_STRUCT(ops);
 371
 372         ops.type = NTVFS_DISK;
 373
 374         /* fill in all the operations */
 375         ops.connect = pvfs_connect;
 376         ops.disconnect = pvfs_disconnect;
 377         ops.unlink = pvfs_unlink;
 378         ops.chkpath = pvfs_chkpath;
 379         ops.qpathinfo = pvfs_qpathinfo;
 380         ops.setpathinfo = pvfs_setpathinfo;
 381         ops.open = pvfs_open;
 382         ops.mkdir = pvfs_mkdir;
 383         ops.rmdir = pvfs_rmdir;
 384         ops.rename = pvfs_rename;
 385         ops.copy = pvfs_copy;
 386         ops.ioctl = pvfs_ioctl;
 387         ops.read = pvfs_read;
 388         ops.write = pvfs_write;
 389         ops.seek = pvfs_seek;
 390         ops.flush = pvfs_flush;
 391         ops.close = pvfs_close;
 392         ops.exit = pvfs_exit;
 393         ops.lock = pvfs_lock;
 394         ops.setfileinfo = pvfs_setfileinfo;
 395         ops.qfileinfo = pvfs_qfileinfo;
 396         ops.fsinfo = pvfs_fsinfo;
 397         ops.lpq = pvfs_lpq;
 398         ops.search_first = pvfs_search_first;
 399         ops.search_next = pvfs_search_next;
 400         ops.search_close = pvfs_search_close;
 401         ops.trans = pvfs_trans;
 402         ops.logoff = pvfs_logoff;
 403         ops.async_setup = pvfs_async_setup;
 404         ops.cancel = pvfs_cancel;
 405         ops.notify = pvfs_notify;
 406
 407         /* register ourselves with the NTVFS subsystem. We register
 408            under the name 'default' as we wish to be the default
 409            backend, and also register as 'posix' */
 410         ops.name = "default";
 411         ret = ntvfs_register(&ops, &vers);
 412
 413         if (!NT_STATUS_IS_OK(ret)) {
 414                 DEBUG(0,("Failed to register POSIX backend as '%s'!\n", ops.name));
 415         }
 416
 417         ops.name = "posix";
 418         ret = ntvfs_register(&ops, &vers);
 419
 420         if (!NT_STATUS_IS_OK(ret)) {
 421                 DEBUG(0,("Failed to register POSIX backend as '%s'!\n", ops.name));
 422         }
 423
 424         if (NT_STATUS_IS_OK(ret)) {
 425                 ret = ntvfs_common_init();
 426         }
 427
 428         return ret;
 429 }