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 #include "includes.h"
  22 #include "smbd/smbd.h"
  23 #include "system/filesys.h"
  24 #include "librpc/gen_ndr/xattr.h"
  25 #include "dbwrap/dbwrap.h"
  26 #include "dbwrap/dbwrap_open.h"
  27 #include "auth.h"
  28 #include "util_tdb.h"
  29 #include "vfs_acl_common.h"
  30
  31 #undef DBGC_CLASS
  32 #define DBGC_CLASS DBGC_VFS
  33
  34 #define ACL_MODULE_NAME "acl_tdb"
  35
  36 static unsigned int ref_count;
  37 static struct db_context *acl_db;
  38
  39 /*******************************************************************
  40  Open acl_db if not already open, increment ref count.
  41 *******************************************************************/
  42
  43 static bool acl_tdb_init(void)
  44 {
  45         char *dbname;
  46
  47         if (acl_db) {
  48                 ref_count++;
  49                 return true;
  50         }
  51
  52         dbname = state_path(talloc_tos(), "file_ntacls.tdb");
  53
  54         if (dbname == NULL) {
  55                 errno = ENOSYS;
  56                 return false;
  57         }
  58
  59         become_root();
  60         acl_db = db_open(NULL, dbname, 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600,
  61                          DBWRAP_LOCK_ORDER_1, DBWRAP_FLAG_NONE);
  62         unbecome_root();
  63
  64         if (acl_db == NULL) {
  65 #if defined(ENOTSUP)
  66                 errno = ENOTSUP;
  67 #else
  68                 errno = ENOSYS;
  69 #endif
  70                 TALLOC_FREE(dbname);
  71                 return false;
  72         }
  73
  74         ref_count++;
  75         TALLOC_FREE(dbname);
  76         return true;
  77 }
  78
  79 /*******************************************************************
  80  Lower ref count and close acl_db if zero.
  81 *******************************************************************/
  82
  83 static void disconnect_acl_tdb(struct vfs_handle_struct *handle)
  84 {
  85         SMB_VFS_NEXT_DISCONNECT(handle);
  86         ref_count--;
  87         if (ref_count == 0) {
  88                 TALLOC_FREE(acl_db);
  89         }
  90 }
  91
  92 /*******************************************************************
  93  Fetch_lock the tdb acl record for a file
  94 *******************************************************************/
  95
  96 static struct db_record *acl_tdb_lock(TALLOC_CTX *mem_ctx,
  97                                         struct db_context *db,
  98                                         const struct file_id *id)
  99 {
 100         uint8_t id_buf[16];
 101
 102         /* For backwards compatibility only store the dev/inode. */
 103         push_file_id_16((char *)id_buf, id);
 104         return dbwrap_fetch_locked(db,
 105                                    mem_ctx,
 106                                    make_tdb_data(id_buf,
 107                                                  sizeof(id_buf)));
 108 }
 109
 110 /*******************************************************************
 111  Delete the tdb acl record for a file
 112 *******************************************************************/
 113
 114 static NTSTATUS acl_tdb_delete(vfs_handle_struct *handle,
 115                                 struct db_context *db,
 116                                 SMB_STRUCT_STAT *psbuf)
 117 {
 118         NTSTATUS status;
 119         struct file_id id = vfs_file_id_from_sbuf(handle->conn, psbuf);
 120         struct db_record *rec = acl_tdb_lock(talloc_tos(), db, &id);
 121
 122         /*
 123          * If rec == NULL there's not much we can do about it
 124          */
 125
 126         if (rec == NULL) {
 127                 DEBUG(10,("acl_tdb_delete: rec == NULL\n"));
 128                 TALLOC_FREE(rec);
 129                 return NT_STATUS_OK;
 130         }
 131
 132         status = dbwrap_record_delete(rec);
 133         TALLOC_FREE(rec);
 134         return status;
 135 }
 136
 137 /*******************************************************************
 138  Pull a security descriptor into a DATA_BLOB from a tdb store.
 139 *******************************************************************/
 140
 141 static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
 142                         vfs_handle_struct *handle,
 143                         files_struct *fsp,
 144                         const struct smb_filename *smb_fname,
 145                         DATA_BLOB *pblob)
 146 {
 147         uint8_t id_buf[16];
 148         TDB_DATA data;
 149         struct file_id id;
 150         struct db_context *db = acl_db;
 151         NTSTATUS status = NT_STATUS_OK;
 152         SMB_STRUCT_STAT sbuf;
 153
 154         ZERO_STRUCT(sbuf);
 155
 156         if (fsp) {
 157                 status = vfs_stat_fsp(fsp);
 158                 sbuf = fsp->fsp_name->st;
 159         } else {
 160                 int ret = vfs_stat_smb_basename(handle->conn,
 161                                 smb_fname,
 162                                 &sbuf);
 163                 if (ret == -1) {
 164                         status = map_nt_error_from_unix(errno);
 165                 }
 166         }
 167
 168         if (!NT_STATUS_IS_OK(status)) {
 169                 return status;
 170         }
 171
 172         id = vfs_file_id_from_sbuf(handle->conn, &sbuf);
 173
 174         /* For backwards compatibility only store the dev/inode. */
 175         push_file_id_16((char *)id_buf, &id);
 176
 177         status = dbwrap_fetch(db,
 178                               ctx,
 179                               make_tdb_data(id_buf, sizeof(id_buf)),
 180                               &data);
 181         if (!NT_STATUS_IS_OK(status)) {
 182                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 183         }
 184
 185         pblob->data = data.dptr;
 186         pblob->length = data.dsize;
 187
 188         DEBUG(10,("get_acl_blob: returned %u bytes from file %s\n",
 189                 (unsigned int)data.dsize, smb_fname->base_name ));
 190
 191         if (pblob->length == 0 || pblob->data == NULL) {
 192                 return NT_STATUS_NOT_FOUND;
 193         }
 194         return NT_STATUS_OK;
 195 }
 196
 197 /*******************************************************************
 198  Store a DATA_BLOB into a tdb record given an fsp pointer.
 199 *******************************************************************/
 200
 201 static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
 202                                 files_struct *fsp,
 203                                 DATA_BLOB *pblob)
 204 {
 205         uint8_t id_buf[16];
 206         struct file_id id;
 207         TDB_DATA data;
 208         struct db_context *db = acl_db;
 209         struct db_record *rec;
 210         NTSTATUS status;
 211
 212         DEBUG(10,("store_acl_blob_fsp: storing blob length %u on file %s\n",
 213                   (unsigned int)pblob->length, fsp_str_dbg(fsp)));
 214
 215         status = vfs_stat_fsp(fsp);
 216         if (!NT_STATUS_IS_OK(status)) {
 217                 return status;
 218         }
 219
 220         id = vfs_file_id_from_sbuf(handle->conn, &fsp->fsp_name->st);
 221
 222         /* For backwards compatibility only store the dev/inode. */
 223         push_file_id_16((char *)id_buf, &id);
 224         rec = dbwrap_fetch_locked(db, talloc_tos(),
 225                                   make_tdb_data(id_buf,
 226                                                 sizeof(id_buf)));
 227         if (rec == NULL) {
 228                 DEBUG(0, ("store_acl_blob_fsp_tdb: fetch_lock failed\n"));
 229                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 230         }
 231         data.dptr = pblob->data;
 232         data.dsize = pblob->length;
 233         return dbwrap_record_store(rec, data, 0);
 234 }
 235
 236 /*********************************************************************
 237  On unlink we need to delete the tdb record (if using tdb).
 238 *********************************************************************/
 239
 240 static int unlink_acl_tdb(vfs_handle_struct *handle,
 241                           const struct smb_filename *smb_fname)
 242 {
 243         struct smb_filename *smb_fname_tmp = NULL;
 244         struct db_context *db = acl_db;
 245         int ret = -1;
 246
 247         smb_fname_tmp = cp_smb_filename_nostream(talloc_tos(), smb_fname);
 248         if (smb_fname_tmp == NULL) {
 249                 errno = ENOMEM;
 250                 goto out;
 251         }
 252
 253         if (smb_fname_tmp->flags & SMB_FILENAME_POSIX_PATH) {
 254                 ret = SMB_VFS_LSTAT(handle->conn, smb_fname_tmp);
 255         } else {
 256                 ret = SMB_VFS_STAT(handle->conn, smb_fname_tmp);
 257         }
 258
 259         if (ret == -1) {
 260                 goto out;
 261         }
 262
 263         ret = unlink_acl_common(handle, smb_fname_tmp);
 264
 265         if (ret == -1) {
 266                 goto out;
 267         }
 268
 269         acl_tdb_delete(handle, db, &smb_fname_tmp->st);
 270  out:
 271         return ret;
 272 }
 273
 274 /*********************************************************************
 275  On unlinkat we need to delete the tdb record (if using tdb).
 276 *********************************************************************/
 277
 278 static int unlinkat_acl_tdb(vfs_handle_struct *handle,
 279                         struct files_struct *dirfsp,
 280                         const struct smb_filename *smb_fname,
 281                         int flags)
 282 {
 283         struct smb_filename *smb_fname_tmp = NULL;
 284         struct db_context *db = acl_db;
 285         int ret = -1;
 286
 287         smb_fname_tmp = cp_smb_filename_nostream(talloc_tos(), smb_fname);
 288         if (smb_fname_tmp == NULL) {
 289                 errno = ENOMEM;
 290                 goto out;
 291         }
 292
 293         if (smb_fname_tmp->flags & SMB_FILENAME_POSIX_PATH) {
 294                 ret = SMB_VFS_LSTAT(handle->conn, smb_fname_tmp);
 295         } else {
 296                 ret = SMB_VFS_STAT(handle->conn, smb_fname_tmp);
 297         }
 298
 299         if (ret == -1) {
 300                 goto out;
 301         }
 302
 303         if (flags & AT_REMOVEDIR) {
 304                 ret = rmdir_acl_common(handle, smb_fname_tmp);
 305         } else {
 306                 ret = unlink_acl_common(handle, smb_fname_tmp);
 307         }
 308
 309         if (ret == -1) {
 310                 goto out;
 311         }
 312
 313         acl_tdb_delete(handle, db, &smb_fname_tmp->st);
 314  out:
 315         return ret;
 316 }
 317
 318 /*********************************************************************
 319  On rmdir we need to delete the tdb record (if using tdb).
 320 *********************************************************************/
 321
 322 static int rmdir_acl_tdb(vfs_handle_struct *handle,
 323                 const struct smb_filename *smb_fname)
 324 {
 325
 326         SMB_STRUCT_STAT sbuf;
 327         struct db_context *db = acl_db;
 328         int ret = -1;
 329
 330         ret = vfs_stat_smb_basename(handle->conn, smb_fname, &sbuf);
 331         if (ret == -1) {
 332                 return -1;
 333         }
 334
 335         ret = rmdir_acl_common(handle, smb_fname);
 336         if (ret == -1) {
 337                 return -1;
 338         }
 339
 340         acl_tdb_delete(handle, db, &sbuf);
 341         return 0;
 342 }
 343
 344 /*******************************************************************
 345  Handle opening the storage tdb if so configured.
 346 *******************************************************************/
 347
 348 static int connect_acl_tdb(struct vfs_handle_struct *handle,
 349                                 const char *service,
 350                                 const char *user)
 351 {
 352         int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
 353         bool ok;
 354         struct acl_common_config *config = NULL;
 355
 356         if (ret < 0) {
 357                 return ret;
 358         }
 359
 360         if (!acl_tdb_init()) {
 361                 SMB_VFS_NEXT_DISCONNECT(handle);
 362                 return -1;
 363         }
 364
 365         ok = init_acl_common_config(handle, ACL_MODULE_NAME);
 366         if (!ok) {
 367                 DBG_ERR("init_acl_common_config failed\n");
 368                 return -1;
 369         }
 370
 371         /* Ensure we have the parameters correct if we're
 372          * using this module. */
 373         DEBUG(2,("connect_acl_tdb: setting 'inherit acls = true' "
 374                 "'dos filemode = true' and "
 375                 "'force unknown acl user = true' for service %s\n",
 376                 service ));
 377
 378         lp_do_parameter(SNUM(handle->conn), "inherit acls", "true");
 379         lp_do_parameter(SNUM(handle->conn), "dos filemode", "true");
 380         lp_do_parameter(SNUM(handle->conn), "force unknown acl user", "true");
 381
 382         SMB_VFS_HANDLE_GET_DATA(handle, config,
 383                                 struct acl_common_config,
 384                                 return -1);
 385
 386         if (config->ignore_system_acls) {
 387                 mode_t create_mask = lp_create_mask(SNUM(handle->conn));
 388                 char *create_mask_str = NULL;
 389
 390                 if ((create_mask & 0666) != 0666) {
 391                         create_mask |= 0666;
 392                         create_mask_str = talloc_asprintf(handle, "0%o",
 393                                                           create_mask);
 394                         if (create_mask_str == NULL) {
 395                                 DBG_ERR("talloc_asprintf failed\n");
 396                                 return -1;
 397                         }
 398
 399                         DBG_NOTICE("setting 'create mask = %s'\n", create_mask_str);
 400
 401                         lp_do_parameter (SNUM(handle->conn),
 402                                         "create mask", create_mask_str);
 403
 404                         TALLOC_FREE(create_mask_str);
 405                 }
 406
 407                 DBG_NOTICE("setting 'directory mask = 0777', "
 408                            "'store dos attributes = yes' and all "
 409                            "'map ...' options to 'no'\n");
 410
 411                 lp_do_parameter(SNUM(handle->conn), "directory mask", "0777");
 412                 lp_do_parameter(SNUM(handle->conn), "map archive", "no");
 413                 lp_do_parameter(SNUM(handle->conn), "map hidden", "no");
 414                 lp_do_parameter(SNUM(handle->conn), "map readonly", "no");
 415                 lp_do_parameter(SNUM(handle->conn), "map system", "no");
 416                 lp_do_parameter(SNUM(handle->conn), "store dos attributes",
 417                                 "yes");
 418         }
 419
 420         return 0;
 421 }
 422
 423 /*********************************************************************
 424  Remove a Windows ACL - we're setting the underlying POSIX ACL.
 425 *********************************************************************/
 426
 427 static int sys_acl_set_file_tdb(vfs_handle_struct *handle,
 428                         const struct smb_filename *smb_fname_in,
 429                         SMB_ACL_TYPE_T type,
 430                         SMB_ACL_T theacl)
 431 {
 432         struct db_context *db = acl_db;
 433         int ret = -1;
 434         int saved_errno = 0;
 435         struct smb_filename *smb_fname = NULL;
 436
 437         smb_fname = cp_smb_filename_nostream(talloc_tos(), smb_fname_in);
 438         if (smb_fname == NULL) {
 439                 return -1;
 440         };
 441
 442         ret = SMB_VFS_STAT(handle->conn, smb_fname);
 443         if (ret == -1) {
 444                 saved_errno = errno;
 445                 goto fail;
 446         }
 447
 448         ret = SMB_VFS_NEXT_SYS_ACL_SET_FILE(handle,
 449                                                 smb_fname,
 450                                                 type,
 451                                                 theacl);
 452         if (ret == -1) {
 453                 saved_errno = errno;
 454                 goto fail;
 455         }
 456
 457         acl_tdb_delete(handle, db, &smb_fname->st);
 458
 459 fail:
 460         TALLOC_FREE(smb_fname);
 461
 462         if (saved_errno != 0) {
 463                 errno = saved_errno;
 464         }
 465         return ret;
 466 }
 467
 468 /*********************************************************************
 469  Remove a Windows ACL - we're setting the underlying POSIX ACL.
 470 *********************************************************************/
 471
 472 static int sys_acl_set_fd_tdb(vfs_handle_struct *handle,
 473                             files_struct *fsp,
 474                             SMB_ACL_T theacl)
 475 {
 476         struct db_context *db = acl_db;
 477         NTSTATUS status;
 478         int ret;
 479
 480         status = vfs_stat_fsp(fsp);
 481         if (!NT_STATUS_IS_OK(status)) {
 482                 return -1;
 483         }
 484
 485         ret = SMB_VFS_NEXT_SYS_ACL_SET_FD(handle,
 486                                                 fsp,
 487                                                 theacl);
 488         if (ret == -1) {
 489                 return -1;
 490         }
 491
 492         acl_tdb_delete(handle, db, &fsp->fsp_name->st);
 493         return 0;
 494 }
 495
 496 static NTSTATUS acl_tdb_fget_nt_acl(vfs_handle_struct *handle,
 497                                     files_struct *fsp,
 498                                     uint32_t security_info,
 499                                     TALLOC_CTX *mem_ctx,
 500                                     struct security_descriptor **ppdesc)
 501 {
 502         NTSTATUS status;
 503         status = get_nt_acl_common(get_acl_blob, handle, fsp, NULL,
 504                                    security_info, mem_ctx, ppdesc);
 505         return status;
 506 }
 507
 508 static NTSTATUS acl_tdb_get_nt_acl(vfs_handle_struct *handle,
 509                                    const struct smb_filename *smb_fname,
 510                                    uint32_t security_info,
 511                                    TALLOC_CTX *mem_ctx,
 512                                    struct security_descriptor **ppdesc)
 513 {
 514         NTSTATUS status;
 515         status = get_nt_acl_common(get_acl_blob, handle, NULL, smb_fname,
 516                                    security_info, mem_ctx, ppdesc);
 517         return status;
 518 }
 519
 520 static NTSTATUS acl_tdb_fset_nt_acl(vfs_handle_struct *handle,
 521                                     files_struct *fsp,
 522                                     uint32_t security_info_sent,
 523                                     const struct security_descriptor *psd)
 524 {
 525         NTSTATUS status;
 526         status = fset_nt_acl_common(get_acl_blob, store_acl_blob_fsp,
 527                                     ACL_MODULE_NAME,
 528                                     handle, fsp, security_info_sent, psd);
 529         return status;
 530 }
 531
 532 static struct vfs_fn_pointers vfs_acl_tdb_fns = {
 533         .connect_fn = connect_acl_tdb,
 534         .disconnect_fn = disconnect_acl_tdb,
 535         .rmdir_fn = rmdir_acl_tdb,
 536         .unlink_fn = unlink_acl_tdb,
 537         .unlinkat_fn = unlinkat_acl_tdb,
 538         .chmod_fn = chmod_acl_module_common,
 539         .fchmod_fn = fchmod_acl_module_common,
 540         .fget_nt_acl_fn = acl_tdb_fget_nt_acl,
 541         .get_nt_acl_fn = acl_tdb_get_nt_acl,
 542         .fset_nt_acl_fn = acl_tdb_fset_nt_acl,
 543         .sys_acl_set_file_fn = sys_acl_set_file_tdb,
 544         .sys_acl_set_fd_fn = sys_acl_set_fd_tdb
 545 };
 546
 547 static_decl_vfs;
 548 NTSTATUS vfs_acl_tdb_init(TALLOC_CTX *ctx)
 549 {
 550         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_tdb",
 551                                 &vfs_acl_tdb_fns);
 552 }