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         NTSTATUS status = NT_STATUS_OK;
 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         ZERO_STRUCT(sbuf);
 157
 158         if (fsp) {
 159                 status = vfs_stat_fsp(fsp);
 160                 sbuf = fsp->fsp_name->st;
 161         } else {
 162                 int ret = vfs_stat_smb_fname(handle->conn, name, &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         if (db->fetch(db,
 178                         ctx,
 179                         make_tdb_data(id_buf, sizeof(id_buf)),
 180                         &data) == -1) {
 181                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 182         }
 183
 184         pblob->data = data.dptr;
 185         pblob->length = data.dsize;
 186
 187         DEBUG(10,("get_acl_blob: returned %u bytes from file %s\n",
 188                 (unsigned int)data.dsize, name ));
 189
 190         if (pblob->length == 0 || pblob->data == NULL) {
 191                 return NT_STATUS_NOT_FOUND;
 192         }
 193         return NT_STATUS_OK;
 194 }
 195
 196 /*******************************************************************
 197  Store a DATA_BLOB into a tdb record given an fsp pointer.
 198 *******************************************************************/
 199
 200 static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
 201                                 files_struct *fsp,
 202                                 DATA_BLOB *pblob)
 203 {
 204         uint8 id_buf[16];
 205         struct file_id id;
 206         TDB_DATA data;
 207         struct db_context *db;
 208         struct db_record *rec;
 209         NTSTATUS status;
 210
 211         DEBUG(10,("store_acl_blob_fsp: storing blob length %u on file %s\n",
 212                   (unsigned int)pblob->length, fsp_str_dbg(fsp)));
 213
 214         SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
 215                 return NT_STATUS_INTERNAL_DB_CORRUPTION);
 216
 217         status = vfs_stat_fsp(fsp);
 218         if (!NT_STATUS_IS_OK(status)) {
 219                 return status;
 220         }
 221
 222         id = vfs_file_id_from_sbuf(handle->conn, &fsp->fsp_name->st);
 223
 224         /* For backwards compatibility only store the dev/inode. */
 225         push_file_id_16((char *)id_buf, &id);
 226         rec = db->fetch_locked(db, talloc_tos(),
 227                                 make_tdb_data(id_buf,
 228                                         sizeof(id_buf)));
 229         if (rec == NULL) {
 230                 DEBUG(0, ("store_acl_blob_fsp_tdb: fetch_lock failed\n"));
 231                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 232         }
 233         data.dptr = pblob->data;
 234         data.dsize = pblob->length;
 235         return rec->store(rec, data, 0);
 236 }
 237
 238 /*********************************************************************
 239  On unlink we need to delete the tdb record (if using tdb).
 240 *********************************************************************/
 241
 242 static int unlink_acl_tdb(vfs_handle_struct *handle,
 243                           const struct smb_filename *smb_fname)
 244 {
 245         struct smb_filename *smb_fname_tmp = NULL;
 246         struct db_context *db;
 247         NTSTATUS status;
 248         int ret = -1;
 249
 250         SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1);
 251
 252         status = copy_smb_filename(talloc_tos(), smb_fname, &smb_fname_tmp);
 253         if (!NT_STATUS_IS_OK(status)) {
 254                 errno = map_errno_from_nt_status(status);
 255                 goto out;
 256         }
 257
 258         if (lp_posix_pathnames()) {
 259                 ret = SMB_VFS_LSTAT(handle->conn, smb_fname_tmp);
 260         } else {
 261                 ret = SMB_VFS_STAT(handle->conn, smb_fname_tmp);
 262         }
 263
 264         if (ret == -1) {
 265                 goto out;
 266         }
 267
 268         ret = unlink_acl_common(handle, smb_fname_tmp);
 269
 270         if (ret == -1) {
 271                 goto out;
 272         }
 273
 274         acl_tdb_delete(handle, db, &smb_fname_tmp->st);
 275  out:
 276         return ret;
 277 }
 278
 279 /*********************************************************************
 280  On rmdir we need to delete the tdb record (if using tdb).
 281 *********************************************************************/
 282
 283 static int rmdir_acl_tdb(vfs_handle_struct *handle, const char *path)
 284 {
 285
 286         SMB_STRUCT_STAT sbuf;
 287         struct db_context *db;
 288         int ret = -1;
 289
 290         SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1);
 291
 292         if (lp_posix_pathnames()) {
 293                 ret = vfs_lstat_smb_fname(handle->conn, path, &sbuf);
 294         } else {
 295                 ret = vfs_stat_smb_fname(handle->conn, path, &sbuf);
 296         }
 297
 298         if (ret == -1) {
 299                 return -1;
 300         }
 301
 302         ret = rmdir_acl_common(handle, path);
 303         if (ret == -1) {
 304                 return -1;
 305         }
 306
 307         acl_tdb_delete(handle, db, &sbuf);
 308         return 0;
 309 }
 310
 311 /*******************************************************************
 312  Handle opening the storage tdb if so configured.
 313 *******************************************************************/
 314
 315 static int connect_acl_tdb(struct vfs_handle_struct *handle,
 316                                 const char *service,
 317                                 const char *user)
 318 {
 319         struct db_context *db;
 320         int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
 321
 322         if (ret < 0) {
 323                 return ret;
 324         }
 325
 326         if (!acl_tdb_init(&db)) {
 327                 SMB_VFS_NEXT_DISCONNECT(handle);
 328                 return -1;
 329         }
 330
 331         SMB_VFS_HANDLE_SET_DATA(handle, db, free_acl_tdb_data,
 332                                 struct db_context, return -1);
 333
 334         /* Ensure we have "inherit acls = yes" if we're
 335          * using this module. */
 336         DEBUG(2,("connect_acl_tdb: setting 'inherit acls = true' "
 337                 "and 'dos filemode = true' for service %s\n",
 338                 service ));
 339         lp_do_parameter(SNUM(handle->conn), "inherit acls", "true");
 340         lp_do_parameter(SNUM(handle->conn), "dos filemode", "true");
 341
 342         return 0;
 343 }
 344
 345 /*********************************************************************
 346  Remove a Windows ACL - we're setting the underlying POSIX ACL.
 347 *********************************************************************/
 348
 349 static int sys_acl_set_file_tdb(vfs_handle_struct *handle,
 350                               const char *path,
 351                               SMB_ACL_TYPE_T type,
 352                               SMB_ACL_T theacl)
 353 {
 354         SMB_STRUCT_STAT sbuf;
 355         struct db_context *db;
 356         int ret = -1;
 357
 358         SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1);
 359
 360         if (lp_posix_pathnames()) {
 361                 ret = vfs_lstat_smb_fname(handle->conn, path, &sbuf);
 362         } else {
 363                 ret = vfs_stat_smb_fname(handle->conn, path, &sbuf);
 364         }
 365
 366         if (ret == -1) {
 367                 return -1;
 368         }
 369
 370         ret = SMB_VFS_NEXT_SYS_ACL_SET_FILE(handle,
 371                                                 path,
 372                                                 type,
 373                                                 theacl);
 374         if (ret == -1) {
 375                 return -1;
 376         }
 377
 378         acl_tdb_delete(handle, db, &sbuf);
 379         return 0;
 380 }
 381
 382 /*********************************************************************
 383  Remove a Windows ACL - we're setting the underlying POSIX ACL.
 384 *********************************************************************/
 385
 386 static int sys_acl_set_fd_tdb(vfs_handle_struct *handle,
 387                             files_struct *fsp,
 388                             SMB_ACL_T theacl)
 389 {
 390         struct db_context *db;
 391         NTSTATUS status;
 392         int ret;
 393
 394         SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1);
 395
 396         status = vfs_stat_fsp(fsp);
 397         if (!NT_STATUS_IS_OK(status)) {
 398                 return -1;
 399         }
 400
 401         ret = SMB_VFS_NEXT_SYS_ACL_SET_FD(handle,
 402                                                 fsp,
 403                                                 theacl);
 404         if (ret == -1) {
 405                 return -1;
 406         }
 407
 408         acl_tdb_delete(handle, db, &fsp->fsp_name->st);
 409         return 0;
 410 }
 411
 412 static struct vfs_fn_pointers vfs_acl_tdb_fns = {
 413         .connect_fn = connect_acl_tdb,
 414         .opendir = opendir_acl_common,
 415         .mkdir = mkdir_acl_common,
 416         .open = open_acl_common,
 417         .create_file = create_file_acl_common,
 418         .unlink = unlink_acl_tdb,
 419         .rmdir = rmdir_acl_tdb,
 420         .fget_nt_acl = fget_nt_acl_common,
 421         .get_nt_acl = get_nt_acl_common,
 422         .fset_nt_acl = fset_nt_acl_common,
 423         .sys_acl_set_file = sys_acl_set_file_tdb,
 424         .sys_acl_set_fd = sys_acl_set_fd_tdb
 425 };
 426
 427 NTSTATUS vfs_acl_tdb_init(void)
 428 {
 429         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_tdb",
 430                                 &vfs_acl_tdb_fns);
 431 }