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  Delete the tdb acl record for a file
  94 *******************************************************************/
  95
  96 static NTSTATUS acl_tdb_delete(vfs_handle_struct *handle,
  97                                 struct db_context *db,
  98                                 SMB_STRUCT_STAT *psbuf)
  99 {
 100         NTSTATUS status;
 101         struct file_id id = vfs_file_id_from_sbuf(handle->conn, psbuf);
 102         uint8_t id_buf[16];
 103
 104         /* For backwards compatibility only store the dev/inode. */
 105         push_file_id_16((char *)id_buf, &id);
 106
 107         status = dbwrap_delete(db, make_tdb_data(id_buf, sizeof(id_buf)));
 108         return status;
 109 }
 110
 111 /*******************************************************************
 112  Pull a security descriptor from an fsp into a DATA_BLOB from a tdb store.
 113 *******************************************************************/
 114
 115 static NTSTATUS fget_acl_blob(TALLOC_CTX *ctx,
 116                         vfs_handle_struct *handle,
 117                         files_struct *fsp,
 118                         DATA_BLOB *pblob)
 119 {
 120         uint8_t id_buf[16];
 121         TDB_DATA data;
 122         struct file_id id;
 123         struct db_context *db = acl_db;
 124         NTSTATUS status = NT_STATUS_OK;
 125
 126         status = vfs_stat_fsp(fsp);
 127         if (!NT_STATUS_IS_OK(status)) {
 128                 return status;
 129         }
 130
 131         id = vfs_file_id_from_sbuf(handle->conn, &fsp->fsp_name->st);
 132
 133         /* For backwards compatibility only store the dev/inode. */
 134         push_file_id_16((char *)id_buf, &id);
 135
 136         status = dbwrap_fetch(db,
 137                               ctx,
 138                               make_tdb_data(id_buf, sizeof(id_buf)),
 139                               &data);
 140         if (!NT_STATUS_IS_OK(status)) {
 141                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 142         }
 143
 144         pblob->data = data.dptr;
 145         pblob->length = data.dsize;
 146
 147         DBG_DEBUG("returned %u bytes from file %s\n",
 148                 (unsigned int)data.dsize,
 149                 fsp_str_dbg(fsp));
 150
 151         if (pblob->length == 0 || pblob->data == NULL) {
 152                 return NT_STATUS_NOT_FOUND;
 153         }
 154         return NT_STATUS_OK;
 155 }
 156
 157 /*******************************************************************
 158  Pull a security descriptor into a DATA_BLOB from a tdb store.
 159 *******************************************************************/
 160
 161 static NTSTATUS get_acl_blob_at(TALLOC_CTX *ctx,
 162                         vfs_handle_struct *handle,
 163                         struct files_struct *dirfsp,
 164                         const struct smb_filename *smb_fname,
 165                         DATA_BLOB *pblob)
 166 {
 167         uint8_t id_buf[16];
 168         TDB_DATA data;
 169         struct file_id id;
 170         struct db_context *db = acl_db;
 171         NTSTATUS status = NT_STATUS_OK;
 172         SMB_STRUCT_STAT sbuf;
 173         int ret;
 174
 175         ZERO_STRUCT(sbuf);
 176
 177         ret = vfs_stat_smb_basename(handle->conn,
 178                                 smb_fname,
 179                                 &sbuf);
 180         if (ret == -1) {
 181                 status = map_nt_error_from_unix(errno);
 182         }
 183
 184         if (!NT_STATUS_IS_OK(status)) {
 185                 return status;
 186         }
 187
 188         id = vfs_file_id_from_sbuf(handle->conn, &sbuf);
 189
 190         /* For backwards compatibility only store the dev/inode. */
 191         push_file_id_16((char *)id_buf, &id);
 192
 193         status = dbwrap_fetch(db,
 194                               ctx,
 195                               make_tdb_data(id_buf, sizeof(id_buf)),
 196                               &data);
 197         if (!NT_STATUS_IS_OK(status)) {
 198                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 199         }
 200
 201         pblob->data = data.dptr;
 202         pblob->length = data.dsize;
 203
 204         DBG_DEBUG("returned %u bytes from file %s\n",
 205                 (unsigned int)data.dsize, smb_fname->base_name );
 206
 207         if (pblob->length == 0 || pblob->data == NULL) {
 208                 return NT_STATUS_NOT_FOUND;
 209         }
 210         return NT_STATUS_OK;
 211 }
 212
 213 /*******************************************************************
 214  Store a DATA_BLOB into a tdb record given an fsp pointer.
 215 *******************************************************************/
 216
 217 static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
 218                                 files_struct *fsp,
 219                                 DATA_BLOB *pblob)
 220 {
 221         uint8_t id_buf[16];
 222         struct file_id id;
 223         TDB_DATA data = { .dptr = pblob->data, .dsize = pblob->length };
 224         struct db_context *db = acl_db;
 225         NTSTATUS status;
 226
 227         DEBUG(10,("store_acl_blob_fsp: storing blob length %u on file %s\n",
 228                   (unsigned int)pblob->length, fsp_str_dbg(fsp)));
 229
 230         status = vfs_stat_fsp(fsp);
 231         if (!NT_STATUS_IS_OK(status)) {
 232                 return status;
 233         }
 234
 235         id = vfs_file_id_from_sbuf(handle->conn, &fsp->fsp_name->st);
 236
 237         /* For backwards compatibility only store the dev/inode. */
 238         push_file_id_16((char *)id_buf, &id);
 239
 240         status = dbwrap_store(
 241                 db, make_tdb_data(id_buf, sizeof(id_buf)), data, 0);
 242         return status;
 243 }
 244
 245 /*********************************************************************
 246  On unlinkat we need to delete the tdb record (if using tdb).
 247 *********************************************************************/
 248
 249 static int unlinkat_acl_tdb(vfs_handle_struct *handle,
 250                         struct files_struct *dirfsp,
 251                         const struct smb_filename *smb_fname,
 252                         int flags)
 253 {
 254         struct smb_filename *smb_fname_tmp = NULL;
 255         struct db_context *db = acl_db;
 256         int ret = -1;
 257
 258         smb_fname_tmp = cp_smb_filename_nostream(talloc_tos(), smb_fname);
 259         if (smb_fname_tmp == NULL) {
 260                 errno = ENOMEM;
 261                 goto out;
 262         }
 263
 264         ret = vfs_stat(handle->conn, smb_fname_tmp);
 265         if (ret == -1) {
 266                 goto out;
 267         }
 268
 269         if (flags & AT_REMOVEDIR) {
 270                 ret = rmdir_acl_common(handle,
 271                                 dirfsp,
 272                                 smb_fname_tmp);
 273         } else {
 274                 ret = unlink_acl_common(handle,
 275                                 dirfsp,
 276                                 smb_fname_tmp,
 277                                 flags);
 278         }
 279
 280         if (ret == -1) {
 281                 goto out;
 282         }
 283
 284         acl_tdb_delete(handle, db, &smb_fname_tmp->st);
 285  out:
 286         return ret;
 287 }
 288
 289 /*******************************************************************
 290  Handle opening the storage tdb if so configured.
 291 *******************************************************************/
 292
 293 static int connect_acl_tdb(struct vfs_handle_struct *handle,
 294                                 const char *service,
 295                                 const char *user)
 296 {
 297         int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
 298         bool ok;
 299         struct acl_common_config *config = NULL;
 300
 301         if (ret < 0) {
 302                 return ret;
 303         }
 304
 305         if (!acl_tdb_init()) {
 306                 SMB_VFS_NEXT_DISCONNECT(handle);
 307                 return -1;
 308         }
 309
 310         ok = init_acl_common_config(handle, ACL_MODULE_NAME);
 311         if (!ok) {
 312                 DBG_ERR("init_acl_common_config failed\n");
 313                 return -1;
 314         }
 315
 316         /* Ensure we have the parameters correct if we're
 317          * using this module. */
 318         DEBUG(2,("connect_acl_tdb: setting 'inherit acls = true' "
 319                 "'dos filemode = true' and "
 320                 "'force unknown acl user = true' for service %s\n",
 321                 service ));
 322
 323         lp_do_parameter(SNUM(handle->conn), "inherit acls", "true");
 324         lp_do_parameter(SNUM(handle->conn), "dos filemode", "true");
 325         lp_do_parameter(SNUM(handle->conn), "force unknown acl user", "true");
 326
 327         SMB_VFS_HANDLE_GET_DATA(handle, config,
 328                                 struct acl_common_config,
 329                                 return -1);
 330
 331         if (config->ignore_system_acls) {
 332                 mode_t create_mask = lp_create_mask(SNUM(handle->conn));
 333                 char *create_mask_str = NULL;
 334
 335                 if ((create_mask & 0666) != 0666) {
 336                         create_mask |= 0666;
 337                         create_mask_str = talloc_asprintf(handle, "0%o",
 338                                                           create_mask);
 339                         if (create_mask_str == NULL) {
 340                                 DBG_ERR("talloc_asprintf failed\n");
 341                                 return -1;
 342                         }
 343
 344                         DBG_NOTICE("setting 'create mask = %s'\n", create_mask_str);
 345
 346                         lp_do_parameter (SNUM(handle->conn),
 347                                         "create mask", create_mask_str);
 348
 349                         TALLOC_FREE(create_mask_str);
 350                 }
 351
 352                 DBG_NOTICE("setting 'directory mask = 0777', "
 353                            "'store dos attributes = yes' and all "
 354                            "'map ...' options to 'no'\n");
 355
 356                 lp_do_parameter(SNUM(handle->conn), "directory mask", "0777");
 357                 lp_do_parameter(SNUM(handle->conn), "map archive", "no");
 358                 lp_do_parameter(SNUM(handle->conn), "map hidden", "no");
 359                 lp_do_parameter(SNUM(handle->conn), "map readonly", "no");
 360                 lp_do_parameter(SNUM(handle->conn), "map system", "no");
 361                 lp_do_parameter(SNUM(handle->conn), "store dos attributes",
 362                                 "yes");
 363         }
 364
 365         return 0;
 366 }
 367
 368 /*********************************************************************
 369  Remove a Windows ACL - we're setting the underlying POSIX ACL.
 370 *********************************************************************/
 371
 372 static int sys_acl_set_file_tdb(vfs_handle_struct *handle,
 373                         const struct smb_filename *smb_fname_in,
 374                         SMB_ACL_TYPE_T type,
 375                         SMB_ACL_T theacl)
 376 {
 377         struct db_context *db = acl_db;
 378         int ret = -1;
 379         int saved_errno = 0;
 380         struct smb_filename *smb_fname = NULL;
 381
 382         smb_fname = cp_smb_filename_nostream(talloc_tos(), smb_fname_in);
 383         if (smb_fname == NULL) {
 384                 return -1;
 385         };
 386
 387         ret = SMB_VFS_STAT(handle->conn, smb_fname);
 388         if (ret == -1) {
 389                 saved_errno = errno;
 390                 goto fail;
 391         }
 392
 393         ret = SMB_VFS_NEXT_SYS_ACL_SET_FILE(handle,
 394                                                 smb_fname,
 395                                                 type,
 396                                                 theacl);
 397         if (ret == -1) {
 398                 saved_errno = errno;
 399                 goto fail;
 400         }
 401
 402         acl_tdb_delete(handle, db, &smb_fname->st);
 403
 404 fail:
 405         TALLOC_FREE(smb_fname);
 406
 407         if (saved_errno != 0) {
 408                 errno = saved_errno;
 409         }
 410         return ret;
 411 }
 412
 413 /*********************************************************************
 414  Remove a Windows ACL - we're setting the underlying POSIX ACL.
 415 *********************************************************************/
 416
 417 static int sys_acl_set_fd_tdb(vfs_handle_struct *handle,
 418                             files_struct *fsp,
 419                             SMB_ACL_TYPE_T type,
 420                             SMB_ACL_T theacl)
 421 {
 422         struct db_context *db = acl_db;
 423         NTSTATUS status;
 424         int ret;
 425
 426         status = vfs_stat_fsp(fsp);
 427         if (!NT_STATUS_IS_OK(status)) {
 428                 return -1;
 429         }
 430
 431         ret = SMB_VFS_NEXT_SYS_ACL_SET_FD(handle,
 432                                           fsp,
 433                                           type,
 434                                           theacl);
 435         if (ret == -1) {
 436                 return -1;
 437         }
 438
 439         acl_tdb_delete(handle, db, &fsp->fsp_name->st);
 440         return 0;
 441 }
 442
 443 static NTSTATUS acl_tdb_fget_nt_acl(vfs_handle_struct *handle,
 444                                     files_struct *fsp,
 445                                     uint32_t security_info,
 446                                     TALLOC_CTX *mem_ctx,
 447                                     struct security_descriptor **ppdesc)
 448 {
 449         NTSTATUS status;
 450         status = fget_nt_acl_common(fget_acl_blob, handle, fsp,
 451                                    security_info, mem_ctx, ppdesc);
 452         return status;
 453 }
 454
 455 static NTSTATUS acl_tdb_get_nt_acl_at(vfs_handle_struct *handle,
 456                                 struct files_struct *dirfsp,
 457                                 const struct smb_filename *smb_fname,
 458                                 uint32_t security_info,
 459                                 TALLOC_CTX *mem_ctx,
 460                                 struct security_descriptor **ppdesc)
 461 {
 462         NTSTATUS status;
 463         status = get_nt_acl_common_at(get_acl_blob_at,
 464                                 handle,
 465                                 dirfsp,
 466                                 smb_fname,
 467                                 security_info,
 468                                 mem_ctx,
 469                                 ppdesc);
 470         return status;
 471 }
 472
 473
 474 static NTSTATUS acl_tdb_fset_nt_acl(vfs_handle_struct *handle,
 475                                     files_struct *fsp,
 476                                     uint32_t security_info_sent,
 477                                     const struct security_descriptor *psd)
 478 {
 479         NTSTATUS status;
 480         status = fset_nt_acl_common(fget_acl_blob, store_acl_blob_fsp,
 481                                     ACL_MODULE_NAME,
 482                                     handle, fsp, security_info_sent, psd);
 483         return status;
 484 }
 485
 486 static struct vfs_fn_pointers vfs_acl_tdb_fns = {
 487         .connect_fn = connect_acl_tdb,
 488         .disconnect_fn = disconnect_acl_tdb,
 489         .unlinkat_fn = unlinkat_acl_tdb,
 490         .chmod_fn = chmod_acl_module_common,
 491         .fchmod_fn = fchmod_acl_module_common,
 492         .fget_nt_acl_fn = acl_tdb_fget_nt_acl,
 493         .get_nt_acl_at_fn = acl_tdb_get_nt_acl_at,
 494         .fset_nt_acl_fn = acl_tdb_fset_nt_acl,
 495         .sys_acl_set_file_fn = sys_acl_set_file_tdb,
 496         .sys_acl_set_fd_fn = sys_acl_set_fd_tdb
 497 };
 498
 499 static_decl_vfs;
 500 NTSTATUS vfs_acl_tdb_init(TALLOC_CTX *ctx)
 501 {
 502         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_tdb",
 503                                 &vfs_acl_tdb_fns);
 504 }