source3/modules/vfs_acl_tdb.c

   1 /*
   2  * Store Windows ACLs in a tdb.
   3  *
   4  * Copyright (C) Volker Lendecke, 2008
   5  * Copyright (C) Jeremy Allison, 2008
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 /* NOTE: This is an experimental module, not yet finished. JRA. */
  22
  23 #include "includes.h"
  24 #include "librpc/gen_ndr/xattr.h"
  25 #include "librpc/gen_ndr/ndr_xattr.h"
  26 #include "../lib/crypto/crypto.h"
  27
  28 #undef DBGC_CLASS
  29 #define DBGC_CLASS DBGC_VFS
  30
  31 #include "modules/vfs_acl_common.c"
  32
  33 static unsigned int ref_count;
  34 static struct db_context *acl_db;
  35
  36 /*******************************************************************
  37  Open acl_db if not already open, increment ref count.
  38 *******************************************************************/
  39
  40 static bool acl_tdb_init(struct db_context **pp_db)
  41 {
  42         char *dbname;
  43
  44         if (acl_db) {
  45                 *pp_db = acl_db;
  46                 ref_count++;
  47                 return true;
  48         }
  49
  50         dbname = state_path("file_ntacls.tdb");
  51
  52         if (dbname == NULL) {
  53                 errno = ENOSYS;
  54                 return false;
  55         }
  56
  57         become_root();
  58         *pp_db = db_open(NULL, dbname, 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
  59         unbecome_root();
  60
  61         if (*pp_db == NULL) {
  62 #if defined(ENOTSUP)
  63                 errno = ENOTSUP;
  64 #else
  65                 errno = ENOSYS;
  66 #endif
  67                 TALLOC_FREE(dbname);
  68                 return false;
  69         }
  70
  71         ref_count++;
  72         TALLOC_FREE(dbname);
  73         return true;
  74 }
  75
  76 /*******************************************************************
  77  Lower ref count and close acl_db if zero.
  78 *******************************************************************/
  79
  80 static void free_acl_tdb_data(void **pptr)
  81 {
  82         struct db_context **pp_db = (struct db_context **)pptr;
  83
  84         ref_count--;
  85         if (ref_count == 0) {
  86                 TALLOC_FREE(*pp_db);
  87                 acl_db = NULL;
  88         }
  89 }
  90
  91 /*******************************************************************
  92  Fetch_lock the tdb acl record for a file
  93 *******************************************************************/
  94
  95 static struct db_record *acl_tdb_lock(TALLOC_CTX *mem_ctx,
  96                                         struct db_context *db,
  97                                         const struct file_id *id)
  98 {
  99         uint8 id_buf[16];
 100
 101         /* For backwards compatibility only store the dev/inode. */
 102         push_file_id_16((char *)id_buf, id);
 103         return db->fetch_locked(db,
 104                                 mem_ctx,
 105                                 make_tdb_data(id_buf,
 106                                         sizeof(id_buf)));
 107 }
 108
 109 /*******************************************************************
 110  Delete the tdb acl record for a file
 111 *******************************************************************/
 112
 113 static NTSTATUS acl_tdb_delete(vfs_handle_struct *handle,
 114                                 struct db_context *db,
 115                                 SMB_STRUCT_STAT *psbuf)
 116 {
 117         NTSTATUS status;
 118         struct file_id id = vfs_file_id_from_sbuf(handle->conn, psbuf);
 119         struct db_record *rec = acl_tdb_lock(talloc_tos(), db, &id);
 120
 121         /*
 122          * If rec == NULL there's not much we can do about it
 123          */
 124
 125         if (rec == NULL) {
 126                 DEBUG(10,("acl_tdb_delete: rec == NULL\n"));
 127                 TALLOC_FREE(rec);
 128                 return NT_STATUS_OK;
 129         }
 130
 131         status = rec->delete_rec(rec);
 132         TALLOC_FREE(rec);
 133         return status;
 134 }
 135
 136 /*******************************************************************
 137  Pull a security descriptor into a DATA_BLOB from a tdb store.
 138 *******************************************************************/
 139
 140 static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
 141                         vfs_handle_struct *handle,
 142                         files_struct *fsp,
 143                         const char *name,
 144                         DATA_BLOB *pblob)
 145 {
 146         uint8 id_buf[16];
 147         TDB_DATA data;
 148         struct file_id id;
 149         struct db_context *db;
 150         int ret = -1;
 151         SMB_STRUCT_STAT sbuf;
 152
 153         SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
 154                 return NT_STATUS_INTERNAL_DB_CORRUPTION);
 155
 156         if (fsp && fsp->fh->fd != -1) {
 157                 ret = SMB_VFS_FSTAT(fsp, &sbuf);
 158         } else {
 159                 if (fsp && fsp->posix_open) {
 160                         ret = vfs_lstat_smb_fname(handle->conn, name, &sbuf);
 161                 } else {
 162                         ret = vfs_stat_smb_fname(handle->conn, name, &sbuf);
 163                 }
 164         }
 165
 166         if (ret == -1) {
 167                 return map_nt_error_from_unix(errno);
 168         }
 169
 170         id = vfs_file_id_from_sbuf(handle->conn, &sbuf);
 171
 172         /* For backwards compatibility only store the dev/inode. */
 173         push_file_id_16((char *)id_buf, &id);
 174
 175         if (db->fetch(db,
 176                         ctx,
 177                         make_tdb_data(id_buf, sizeof(id_buf)),
 178                         &data) == -1) {
 179                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 180         }
 181
 182         pblob->data = data.dptr;
 183         pblob->length = data.dsize;
 184
 185         DEBUG(10,("get_acl_blob: returned %u bytes from file %s\n",
 186                 (unsigned int)data.dsize, name ));
 187
 188         if (pblob->length == 0 || pblob->data == NULL) {
 189                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 190         }
 191         return NT_STATUS_OK;
 192 }
 193
 194 /*******************************************************************
 195  Store a DATA_BLOB into a tdb record given an fsp pointer.
 196 *******************************************************************/
 197
 198 static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
 199                                 files_struct *fsp,
 200                                 DATA_BLOB *pblob)
 201 {
 202         uint8 id_buf[16];
 203         struct file_id id;
 204         TDB_DATA data;
 205         struct db_context *db;
 206         struct db_record *rec;
 207         int ret = -1;
 208
 209         DEBUG(10,("store_acl_blob_fsp: storing blob length %u on file %s\n",
 210                   (unsigned int)pblob->length, fsp_str_dbg(fsp)));
 211
 212         SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
 213                 return NT_STATUS_INTERNAL_DB_CORRUPTION);
 214
 215         if (fsp->fh->fd != -1) {
 216                 ret = SMB_VFS_FSTAT(fsp, &fsp->fsp_name->st);
 217         } else {
 218                 if (fsp->posix_open) {
 219                         ret = SMB_VFS_LSTAT(handle->conn, fsp->fsp_name);
 220                 } else {
 221                         ret = SMB_VFS_STAT(handle->conn, fsp->fsp_name);
 222                 }
 223         }
 224
 225         if (ret == -1) {
 226                 return map_nt_error_from_unix(errno);
 227         }
 228
 229         id = vfs_file_id_from_sbuf(handle->conn, &fsp->fsp_name->st);
 230
 231         /* For backwards compatibility only store the dev/inode. */
 232         push_file_id_16((char *)id_buf, &id);
 233         rec = db->fetch_locked(db, talloc_tos(),
 234                                 make_tdb_data(id_buf,
 235                                         sizeof(id_buf)));
 236         if (rec == NULL) {
 237                 DEBUG(0, ("store_acl_blob_fsp_tdb: fetch_lock failed\n"));
 238                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 239         }
 240         data.dptr = pblob->data;
 241         data.dsize = pblob->length;
 242         return rec->store(rec, data, 0);
 243 }
 244
 245 /*******************************************************************
 246  Store a DATA_BLOB into a tdb record given a pathname.
 247 *******************************************************************/
 248
 249 static NTSTATUS store_acl_blob_pathname(vfs_handle_struct *handle,
 250                                         const char *fname,
 251                                         DATA_BLOB *pblob)
 252 {
 253         uint8 id_buf[16];
 254         struct file_id id;
 255         TDB_DATA data;
 256         SMB_STRUCT_STAT sbuf;
 257         struct db_context *db;
 258         struct db_record *rec;
 259         int ret = -1;
 260
 261         DEBUG(10,("store_acl_blob_pathname: storing blob "
 262                         "length %u on file %s\n",
 263                         (unsigned int)pblob->length, fname));
 264
 265         SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
 266                 return NT_STATUS_INTERNAL_DB_CORRUPTION);
 267
 268         if (lp_posix_pathnames()) {
 269                 ret = vfs_lstat_smb_fname(handle->conn, fname, &sbuf);
 270         } else {
 271                 ret = vfs_stat_smb_fname(handle->conn, fname, &sbuf);
 272         }
 273
 274         if (ret == -1) {
 275                 return map_nt_error_from_unix(errno);
 276         }
 277
 278         id = vfs_file_id_from_sbuf(handle->conn, &sbuf);
 279
 280         /* For backwards compatibility only store the dev/inode. */
 281         push_file_id_16((char *)id_buf, &id);
 282
 283         rec = db->fetch_locked(db, talloc_tos(),
 284                                 make_tdb_data(id_buf,
 285                                         sizeof(id_buf)));
 286         if (rec == NULL) {
 287                 DEBUG(0, ("store_acl_blob_pathname_tdb: fetch_lock failed\n"));
 288                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 289         }
 290         data.dptr = pblob->data;
 291         data.dsize = pblob->length;
 292         return rec->store(rec, data, 0);
 293 }
 294
 295 /*********************************************************************
 296  On unlink we need to delete the tdb record (if using tdb).
 297 *********************************************************************/
 298
 299 static int unlink_acl_tdb(vfs_handle_struct *handle,
 300                           const struct smb_filename *smb_fname)
 301 {
 302         struct smb_filename *smb_fname_tmp = NULL;
 303         struct db_context *db;
 304         NTSTATUS status;
 305         int ret = -1;
 306
 307         SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1);
 308
 309         status = copy_smb_filename(talloc_tos(), smb_fname, &smb_fname_tmp);
 310         if (!NT_STATUS_IS_OK(status)) {
 311                 errno = map_errno_from_nt_status(status);
 312                 goto out;
 313         }
 314
 315         if (lp_posix_pathnames()) {
 316                 ret = SMB_VFS_LSTAT(handle->conn, smb_fname_tmp);
 317         } else {
 318                 ret = SMB_VFS_STAT(handle->conn, smb_fname_tmp);
 319         }
 320
 321         if (ret == -1) {
 322                 goto out;
 323         }
 324
 325         ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname_tmp);
 326
 327         if (ret == -1) {
 328                 goto out;
 329         }
 330
 331         acl_tdb_delete(handle, db, &smb_fname_tmp->st);
 332  out:
 333         return ret;
 334 }
 335
 336 /*********************************************************************
 337  On rmdir we need to delete the tdb record (if using tdb).
 338 *********************************************************************/
 339
 340 static int rmdir_acl_tdb(vfs_handle_struct *handle, const char *path)
 341 {
 342
 343         SMB_STRUCT_STAT sbuf;
 344         struct db_context *db;
 345         int ret = -1;
 346
 347         SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1);
 348
 349         if (lp_posix_pathnames()) {
 350                 ret = vfs_lstat_smb_fname(handle->conn, path, &sbuf);
 351         } else {
 352                 ret = vfs_stat_smb_fname(handle->conn, path, &sbuf);
 353         }
 354
 355         if (ret == -1) {
 356                 return -1;
 357         }
 358
 359         ret = SMB_VFS_NEXT_RMDIR(handle, path);
 360         if (ret == -1) {
 361                 return -1;
 362         }
 363
 364         acl_tdb_delete(handle, db, &sbuf);
 365         return 0;
 366 }
 367
 368 /*******************************************************************
 369  Handle opening the storage tdb if so configured.
 370 *******************************************************************/
 371
 372 static int connect_acl_tdb(struct vfs_handle_struct *handle,
 373                                 const char *service,
 374                                 const char *user)
 375 {
 376         struct db_context *db;
 377         int res;
 378
 379         res = SMB_VFS_NEXT_CONNECT(handle, service, user);
 380         if (res < 0) {
 381                 return res;
 382         }
 383
 384         if (!acl_tdb_init(&db)) {
 385                 SMB_VFS_NEXT_DISCONNECT(handle);
 386                 return -1;
 387         }
 388
 389         SMB_VFS_HANDLE_SET_DATA(handle, db, free_acl_tdb_data,
 390                                 struct db_context, return -1);
 391
 392         return 0;
 393 }
 394
 395 /*********************************************************************
 396  Remove a Windows ACL - we're setting the underlying POSIX ACL.
 397 *********************************************************************/
 398
 399 static int sys_acl_set_file_tdb(vfs_handle_struct *handle,
 400                               const char *path,
 401                               SMB_ACL_TYPE_T type,
 402                               SMB_ACL_T theacl)
 403 {
 404         SMB_STRUCT_STAT sbuf;
 405         struct db_context *db;
 406         int ret = -1;
 407
 408         SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1);
 409
 410         if (lp_posix_pathnames()) {
 411                 ret = vfs_lstat_smb_fname(handle->conn, path, &sbuf);
 412         } else {
 413                 ret = vfs_stat_smb_fname(handle->conn, path, &sbuf);
 414         }
 415
 416         if (ret == -1) {
 417                 return -1;
 418         }
 419
 420         ret = SMB_VFS_NEXT_SYS_ACL_SET_FILE(handle,
 421                                                 path,
 422                                                 type,
 423                                                 theacl);
 424         if (ret == -1) {
 425                 return -1;
 426         }
 427
 428         acl_tdb_delete(handle, db, &sbuf);
 429         return 0;
 430 }
 431
 432 /*********************************************************************
 433  Remove a Windows ACL - we're setting the underlying POSIX ACL.
 434 *********************************************************************/
 435
 436 static int sys_acl_set_fd_tdb(vfs_handle_struct *handle,
 437                             files_struct *fsp,
 438                             SMB_ACL_T theacl)
 439 {
 440         struct db_context *db;
 441         int ret;
 442
 443         SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1);
 444
 445         if (fsp->is_directory || fsp->fh->fd == -1) {
 446                 if (fsp->posix_open) {
 447                         ret = SMB_VFS_LSTAT(fsp->conn, fsp->fsp_name);
 448                 } else {
 449                         ret = SMB_VFS_STAT(fsp->conn, fsp->fsp_name);
 450                 }
 451         } else {
 452                 ret = SMB_VFS_FSTAT(fsp, &fsp->fsp_name->st);
 453         }
 454         if (ret == -1) {
 455                 return -1;
 456         }
 457
 458         ret = SMB_VFS_NEXT_SYS_ACL_SET_FD(handle,
 459                                                 fsp,
 460                                                 theacl);
 461         if (ret == -1) {
 462                 return -1;
 463         }
 464
 465         acl_tdb_delete(handle, db, &fsp->fsp_name->st);
 466         return 0;
 467 }
 468
 469 static struct vfs_fn_pointers vfs_acl_tdb_fns = {
 470         .connect_fn = connect_acl_tdb,
 471         .mkdir = mkdir_acl_common,
 472         .open = open_acl_common,
 473         .unlink = unlink_acl_tdb,
 474         .rmdir = rmdir_acl_tdb,
 475         .fget_nt_acl = fget_nt_acl_common,
 476         .get_nt_acl = get_nt_acl_common,
 477         .fset_nt_acl = fset_nt_acl_common,
 478         .sys_acl_set_file = sys_acl_set_file_tdb,
 479         .sys_acl_set_fd = sys_acl_set_fd_tdb
 480 };
 481
 482 NTSTATUS vfs_acl_tdb_init(void)
 483 {
 484         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_tdb",
 485                                 &vfs_acl_tdb_fns);
 486 }