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 unlinkat we need to delete the tdb record (if using tdb).
 238 *********************************************************************/
 239
 240 static int unlinkat_acl_tdb(vfs_handle_struct *handle,
 241                         struct files_struct *dirfsp,
 242                         const struct smb_filename *smb_fname,
 243                         int flags)
 244 {
 245         struct smb_filename *smb_fname_tmp = NULL;
 246         struct db_context *db = acl_db;
 247         int ret = -1;
 248
 249         smb_fname_tmp = cp_smb_filename_nostream(talloc_tos(), smb_fname);
 250         if (smb_fname_tmp == NULL) {
 251                 errno = ENOMEM;
 252                 goto out;
 253         }
 254
 255         if (smb_fname_tmp->flags & SMB_FILENAME_POSIX_PATH) {
 256                 ret = SMB_VFS_LSTAT(handle->conn, smb_fname_tmp);
 257         } else {
 258                 ret = SMB_VFS_STAT(handle->conn, smb_fname_tmp);
 259         }
 260
 261         if (ret == -1) {
 262                 goto out;
 263         }
 264
 265         if (flags & AT_REMOVEDIR) {
 266                 ret = rmdir_acl_common(handle, smb_fname_tmp);
 267         } else {
 268                 ret = unlink_acl_common(handle,
 269                                 dirfsp,
 270                                 smb_fname_tmp,
 271                                 flags);
 272         }
 273
 274         if (ret == -1) {
 275                 goto out;
 276         }
 277
 278         acl_tdb_delete(handle, db, &smb_fname_tmp->st);
 279  out:
 280         return ret;
 281 }
 282
 283 /*********************************************************************
 284  On rmdir we need to delete the tdb record (if using tdb).
 285 *********************************************************************/
 286
 287 static int rmdir_acl_tdb(vfs_handle_struct *handle,
 288                 const struct smb_filename *smb_fname)
 289 {
 290
 291         SMB_STRUCT_STAT sbuf;
 292         struct db_context *db = acl_db;
 293         int ret = -1;
 294
 295         ret = vfs_stat_smb_basename(handle->conn, smb_fname, &sbuf);
 296         if (ret == -1) {
 297                 return -1;
 298         }
 299
 300         ret = rmdir_acl_common(handle, smb_fname);
 301         if (ret == -1) {
 302                 return -1;
 303         }
 304
 305         acl_tdb_delete(handle, db, &sbuf);
 306         return 0;
 307 }
 308
 309 /*******************************************************************
 310  Handle opening the storage tdb if so configured.
 311 *******************************************************************/
 312
 313 static int connect_acl_tdb(struct vfs_handle_struct *handle,
 314                                 const char *service,
 315                                 const char *user)
 316 {
 317         int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
 318         bool ok;
 319         struct acl_common_config *config = NULL;
 320
 321         if (ret < 0) {
 322                 return ret;
 323         }
 324
 325         if (!acl_tdb_init()) {
 326                 SMB_VFS_NEXT_DISCONNECT(handle);
 327                 return -1;
 328         }
 329
 330         ok = init_acl_common_config(handle, ACL_MODULE_NAME);
 331         if (!ok) {
 332                 DBG_ERR("init_acl_common_config failed\n");
 333                 return -1;
 334         }
 335
 336         /* Ensure we have the parameters correct if we're
 337          * using this module. */
 338         DEBUG(2,("connect_acl_tdb: setting 'inherit acls = true' "
 339                 "'dos filemode = true' and "
 340                 "'force unknown acl user = true' for service %s\n",
 341                 service ));
 342
 343         lp_do_parameter(SNUM(handle->conn), "inherit acls", "true");
 344         lp_do_parameter(SNUM(handle->conn), "dos filemode", "true");
 345         lp_do_parameter(SNUM(handle->conn), "force unknown acl user", "true");
 346
 347         SMB_VFS_HANDLE_GET_DATA(handle, config,
 348                                 struct acl_common_config,
 349                                 return -1);
 350
 351         if (config->ignore_system_acls) {
 352                 mode_t create_mask = lp_create_mask(SNUM(handle->conn));
 353                 char *create_mask_str = NULL;
 354
 355                 if ((create_mask & 0666) != 0666) {
 356                         create_mask |= 0666;
 357                         create_mask_str = talloc_asprintf(handle, "0%o",
 358                                                           create_mask);
 359                         if (create_mask_str == NULL) {
 360                                 DBG_ERR("talloc_asprintf failed\n");
 361                                 return -1;
 362                         }
 363
 364                         DBG_NOTICE("setting 'create mask = %s'\n", create_mask_str);
 365
 366                         lp_do_parameter (SNUM(handle->conn),
 367                                         "create mask", create_mask_str);
 368
 369                         TALLOC_FREE(create_mask_str);
 370                 }
 371
 372                 DBG_NOTICE("setting 'directory mask = 0777', "
 373                            "'store dos attributes = yes' and all "
 374                            "'map ...' options to 'no'\n");
 375
 376                 lp_do_parameter(SNUM(handle->conn), "directory mask", "0777");
 377                 lp_do_parameter(SNUM(handle->conn), "map archive", "no");
 378                 lp_do_parameter(SNUM(handle->conn), "map hidden", "no");
 379                 lp_do_parameter(SNUM(handle->conn), "map readonly", "no");
 380                 lp_do_parameter(SNUM(handle->conn), "map system", "no");
 381                 lp_do_parameter(SNUM(handle->conn), "store dos attributes",
 382                                 "yes");
 383         }
 384
 385         return 0;
 386 }
 387
 388 /*********************************************************************
 389  Remove a Windows ACL - we're setting the underlying POSIX ACL.
 390 *********************************************************************/
 391
 392 static int sys_acl_set_file_tdb(vfs_handle_struct *handle,
 393                         const struct smb_filename *smb_fname_in,
 394                         SMB_ACL_TYPE_T type,
 395                         SMB_ACL_T theacl)
 396 {
 397         struct db_context *db = acl_db;
 398         int ret = -1;
 399         int saved_errno = 0;
 400         struct smb_filename *smb_fname = NULL;
 401
 402         smb_fname = cp_smb_filename_nostream(talloc_tos(), smb_fname_in);
 403         if (smb_fname == NULL) {
 404                 return -1;
 405         };
 406
 407         ret = SMB_VFS_STAT(handle->conn, smb_fname);
 408         if (ret == -1) {
 409                 saved_errno = errno;
 410                 goto fail;
 411         }
 412
 413         ret = SMB_VFS_NEXT_SYS_ACL_SET_FILE(handle,
 414                                                 smb_fname,
 415                                                 type,
 416                                                 theacl);
 417         if (ret == -1) {
 418                 saved_errno = errno;
 419                 goto fail;
 420         }
 421
 422         acl_tdb_delete(handle, db, &smb_fname->st);
 423
 424 fail:
 425         TALLOC_FREE(smb_fname);
 426
 427         if (saved_errno != 0) {
 428                 errno = saved_errno;
 429         }
 430         return ret;
 431 }
 432
 433 /*********************************************************************
 434  Remove a Windows ACL - we're setting the underlying POSIX ACL.
 435 *********************************************************************/
 436
 437 static int sys_acl_set_fd_tdb(vfs_handle_struct *handle,
 438                             files_struct *fsp,
 439                             SMB_ACL_T theacl)
 440 {
 441         struct db_context *db = acl_db;
 442         NTSTATUS status;
 443         int ret;
 444
 445         status = vfs_stat_fsp(fsp);
 446         if (!NT_STATUS_IS_OK(status)) {
 447                 return -1;
 448         }
 449
 450         ret = SMB_VFS_NEXT_SYS_ACL_SET_FD(handle,
 451                                                 fsp,
 452                                                 theacl);
 453         if (ret == -1) {
 454                 return -1;
 455         }
 456
 457         acl_tdb_delete(handle, db, &fsp->fsp_name->st);
 458         return 0;
 459 }
 460
 461 static NTSTATUS acl_tdb_fget_nt_acl(vfs_handle_struct *handle,
 462                                     files_struct *fsp,
 463                                     uint32_t security_info,
 464                                     TALLOC_CTX *mem_ctx,
 465                                     struct security_descriptor **ppdesc)
 466 {
 467         NTSTATUS status;
 468         status = get_nt_acl_common(get_acl_blob, handle, fsp, NULL,
 469                                    security_info, mem_ctx, ppdesc);
 470         return status;
 471 }
 472
 473 static NTSTATUS acl_tdb_get_nt_acl(vfs_handle_struct *handle,
 474                                    const struct smb_filename *smb_fname,
 475                                    uint32_t security_info,
 476                                    TALLOC_CTX *mem_ctx,
 477                                    struct security_descriptor **ppdesc)
 478 {
 479         NTSTATUS status;
 480         status = get_nt_acl_common(get_acl_blob, handle, NULL, smb_fname,
 481                                    security_info, mem_ctx, ppdesc);
 482         return status;
 483 }
 484
 485 static NTSTATUS acl_tdb_fset_nt_acl(vfs_handle_struct *handle,
 486                                     files_struct *fsp,
 487                                     uint32_t security_info_sent,
 488                                     const struct security_descriptor *psd)
 489 {
 490         NTSTATUS status;
 491         status = fset_nt_acl_common(get_acl_blob, store_acl_blob_fsp,
 492                                     ACL_MODULE_NAME,
 493                                     handle, fsp, security_info_sent, psd);
 494         return status;
 495 }
 496
 497 static struct vfs_fn_pointers vfs_acl_tdb_fns = {
 498         .connect_fn = connect_acl_tdb,
 499         .disconnect_fn = disconnect_acl_tdb,
 500         .rmdir_fn = rmdir_acl_tdb,
 501         .unlinkat_fn = unlinkat_acl_tdb,
 502         .chmod_fn = chmod_acl_module_common,
 503         .fchmod_fn = fchmod_acl_module_common,
 504         .fget_nt_acl_fn = acl_tdb_fget_nt_acl,
 505         .get_nt_acl_fn = acl_tdb_get_nt_acl,
 506         .fset_nt_acl_fn = acl_tdb_fset_nt_acl,
 507         .sys_acl_set_file_fn = sys_acl_set_file_tdb,
 508         .sys_acl_set_fd_fn = sys_acl_set_fd_tdb
 509 };
 510
 511 static_decl_vfs;
 512 NTSTATUS vfs_acl_tdb_init(TALLOC_CTX *ctx)
 513 {
 514         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_tdb",
 515                                 &vfs_acl_tdb_fns);
 516 }