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(void)
  41 {
  42         char *dbname;
  43
  44         if (acl_db) {
  45                 ref_count++;
  46                 return true;
  47         }
  48
  49         dbname = state_path("file_ntacls.tdb");
  50
  51         if (dbname == NULL) {
  52                 errno = ENOSYS;
  53                 return false;
  54         }
  55
  56         become_root();
  57         acl_db = db_open(NULL, dbname, 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
  58         unbecome_root();
  59
  60         if (acl_db == NULL) {
  61 #if defined(ENOTSUP)
  62                 errno = ENOTSUP;
  63 #else
  64                 errno = ENOSYS;
  65 #endif
  66                 TALLOC_FREE(dbname);
  67                 return false;
  68         }
  69
  70         ref_count++;
  71         TALLOC_FREE(dbname);
  72         return true;
  73 }
  74
  75 /*******************************************************************
  76  Lower ref count and close acl_db if zero.
  77 *******************************************************************/
  78
  79 static void disconnect_acl_tdb(struct vfs_handle_struct *handle)
  80 {
  81         SMB_VFS_NEXT_DISCONNECT(handle);
  82         ref_count--;
  83         if (ref_count == 0) {
  84                 TALLOC_FREE(acl_db);
  85         }
  86 }
  87
  88 /*******************************************************************
  89  Fetch_lock the tdb acl record for a file
  90 *******************************************************************/
  91
  92 static struct db_record *acl_tdb_lock(TALLOC_CTX *mem_ctx,
  93                                         struct db_context *db,
  94                                         const struct file_id *id)
  95 {
  96         uint8 id_buf[16];
  97
  98         /* For backwards compatibility only store the dev/inode. */
  99         push_file_id_16((char *)id_buf, id);
 100         return db->fetch_locked(db,
 101                                 mem_ctx,
 102                                 make_tdb_data(id_buf,
 103                                         sizeof(id_buf)));
 104 }
 105
 106 /*******************************************************************
 107  Delete the tdb acl record for a file
 108 *******************************************************************/
 109
 110 static NTSTATUS acl_tdb_delete(vfs_handle_struct *handle,
 111                                 struct db_context *db,
 112                                 SMB_STRUCT_STAT *psbuf)
 113 {
 114         NTSTATUS status;
 115         struct file_id id = vfs_file_id_from_sbuf(handle->conn, psbuf);
 116         struct db_record *rec = acl_tdb_lock(talloc_tos(), db, &id);
 117
 118         /*
 119          * If rec == NULL there's not much we can do about it
 120          */
 121
 122         if (rec == NULL) {
 123                 DEBUG(10,("acl_tdb_delete: rec == NULL\n"));
 124                 TALLOC_FREE(rec);
 125                 return NT_STATUS_OK;
 126         }
 127
 128         status = rec->delete_rec(rec);
 129         TALLOC_FREE(rec);
 130         return status;
 131 }
 132
 133 /*******************************************************************
 134  Pull a security descriptor into a DATA_BLOB from a tdb store.
 135 *******************************************************************/
 136
 137 static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
 138                         vfs_handle_struct *handle,
 139                         files_struct *fsp,
 140                         const char *name,
 141                         DATA_BLOB *pblob)
 142 {
 143         uint8 id_buf[16];
 144         TDB_DATA data;
 145         struct file_id id;
 146         struct db_context *db = acl_db;
 147         NTSTATUS status = NT_STATUS_OK;
 148         SMB_STRUCT_STAT sbuf;
 149
 150         ZERO_STRUCT(sbuf);
 151
 152         if (fsp) {
 153                 status = vfs_stat_fsp(fsp);
 154                 sbuf = fsp->fsp_name->st;
 155         } else {
 156                 int ret = vfs_stat_smb_fname(handle->conn, name, &sbuf);
 157                 if (ret == -1) {
 158                         status = map_nt_error_from_unix(errno);
 159                 }
 160         }
 161
 162         if (!NT_STATUS_IS_OK(status)) {
 163                 return status;
 164         }
 165
 166         id = vfs_file_id_from_sbuf(handle->conn, &sbuf);
 167
 168         /* For backwards compatibility only store the dev/inode. */
 169         push_file_id_16((char *)id_buf, &id);
 170
 171         if (db->fetch(db,
 172                         ctx,
 173                         make_tdb_data(id_buf, sizeof(id_buf)),
 174                         &data) == -1) {
 175                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 176         }
 177
 178         pblob->data = data.dptr;
 179         pblob->length = data.dsize;
 180
 181         DEBUG(10,("get_acl_blob: returned %u bytes from file %s\n",
 182                 (unsigned int)data.dsize, name ));
 183
 184         if (pblob->length == 0 || pblob->data == NULL) {
 185                 return NT_STATUS_NOT_FOUND;
 186         }
 187         return NT_STATUS_OK;
 188 }
 189
 190 /*******************************************************************
 191  Store a DATA_BLOB into a tdb record given an fsp pointer.
 192 *******************************************************************/
 193
 194 static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
 195                                 files_struct *fsp,
 196                                 DATA_BLOB *pblob)
 197 {
 198         uint8 id_buf[16];
 199         struct file_id id;
 200         TDB_DATA data;
 201         struct db_context *db = acl_db;
 202         struct db_record *rec;
 203         NTSTATUS status;
 204
 205         DEBUG(10,("store_acl_blob_fsp: storing blob length %u on file %s\n",
 206                   (unsigned int)pblob->length, fsp_str_dbg(fsp)));
 207
 208         status = vfs_stat_fsp(fsp);
 209         if (!NT_STATUS_IS_OK(status)) {
 210                 return status;
 211         }
 212
 213         id = vfs_file_id_from_sbuf(handle->conn, &fsp->fsp_name->st);
 214
 215         /* For backwards compatibility only store the dev/inode. */
 216         push_file_id_16((char *)id_buf, &id);
 217         rec = db->fetch_locked(db, talloc_tos(),
 218                                 make_tdb_data(id_buf,
 219                                         sizeof(id_buf)));
 220         if (rec == NULL) {
 221                 DEBUG(0, ("store_acl_blob_fsp_tdb: fetch_lock failed\n"));
 222                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 223         }
 224         data.dptr = pblob->data;
 225         data.dsize = pblob->length;
 226         return rec->store(rec, data, 0);
 227 }
 228
 229 /*********************************************************************
 230  On unlink we need to delete the tdb record (if using tdb).
 231 *********************************************************************/
 232
 233 static int unlink_acl_tdb(vfs_handle_struct *handle,
 234                           const struct smb_filename *smb_fname)
 235 {
 236         struct smb_filename *smb_fname_tmp = NULL;
 237         struct db_context *db = acl_db;
 238         NTSTATUS status;
 239         int ret = -1;
 240
 241         status = copy_smb_filename(talloc_tos(), smb_fname, &smb_fname_tmp);
 242         if (!NT_STATUS_IS_OK(status)) {
 243                 errno = map_errno_from_nt_status(status);
 244                 goto out;
 245         }
 246
 247         if (lp_posix_pathnames()) {
 248                 ret = SMB_VFS_LSTAT(handle->conn, smb_fname_tmp);
 249         } else {
 250                 ret = SMB_VFS_STAT(handle->conn, smb_fname_tmp);
 251         }
 252
 253         if (ret == -1) {
 254                 goto out;
 255         }
 256
 257         ret = unlink_acl_common(handle, smb_fname_tmp);
 258
 259         if (ret == -1) {
 260                 goto out;
 261         }
 262
 263         acl_tdb_delete(handle, db, &smb_fname_tmp->st);
 264  out:
 265         return ret;
 266 }
 267
 268 /*********************************************************************
 269  On rmdir we need to delete the tdb record (if using tdb).
 270 *********************************************************************/
 271
 272 static int rmdir_acl_tdb(vfs_handle_struct *handle, const char *path)
 273 {
 274
 275         SMB_STRUCT_STAT sbuf;
 276         struct db_context *db = acl_db;
 277         int ret = -1;
 278
 279         if (lp_posix_pathnames()) {
 280                 ret = vfs_lstat_smb_fname(handle->conn, path, &sbuf);
 281         } else {
 282                 ret = vfs_stat_smb_fname(handle->conn, path, &sbuf);
 283         }
 284
 285         if (ret == -1) {
 286                 return -1;
 287         }
 288
 289         ret = rmdir_acl_common(handle, path);
 290         if (ret == -1) {
 291                 return -1;
 292         }
 293
 294         acl_tdb_delete(handle, db, &sbuf);
 295         return 0;
 296 }
 297
 298 /*******************************************************************
 299  Handle opening the storage tdb if so configured.
 300 *******************************************************************/
 301
 302 static int connect_acl_tdb(struct vfs_handle_struct *handle,
 303                                 const char *service,
 304                                 const char *user)
 305 {
 306         int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
 307
 308         if (ret < 0) {
 309                 return ret;
 310         }
 311
 312         if (!acl_tdb_init()) {
 313                 SMB_VFS_NEXT_DISCONNECT(handle);
 314                 return -1;
 315         }
 316
 317         /* Ensure we have "inherit acls = yes" if we're
 318          * using this module. */
 319         DEBUG(2,("connect_acl_tdb: setting 'inherit acls = true' "
 320                 "and 'dos filemode = true' for service %s\n",
 321                 service ));
 322         lp_do_parameter(SNUM(handle->conn), "inherit acls", "true");
 323         lp_do_parameter(SNUM(handle->conn), "dos filemode", "true");
 324
 325         return 0;
 326 }
 327
 328 /*********************************************************************
 329  Remove a Windows ACL - we're setting the underlying POSIX ACL.
 330 *********************************************************************/
 331
 332 static int sys_acl_set_file_tdb(vfs_handle_struct *handle,
 333                               const char *path,
 334                               SMB_ACL_TYPE_T type,
 335                               SMB_ACL_T theacl)
 336 {
 337         SMB_STRUCT_STAT sbuf;
 338         struct db_context *db = acl_db;
 339         int ret = -1;
 340
 341         if (lp_posix_pathnames()) {
 342                 ret = vfs_lstat_smb_fname(handle->conn, path, &sbuf);
 343         } else {
 344                 ret = vfs_stat_smb_fname(handle->conn, path, &sbuf);
 345         }
 346
 347         if (ret == -1) {
 348                 return -1;
 349         }
 350
 351         ret = SMB_VFS_NEXT_SYS_ACL_SET_FILE(handle,
 352                                                 path,
 353                                                 type,
 354                                                 theacl);
 355         if (ret == -1) {
 356                 return -1;
 357         }
 358
 359         acl_tdb_delete(handle, db, &sbuf);
 360         return 0;
 361 }
 362
 363 /*********************************************************************
 364  Remove a Windows ACL - we're setting the underlying POSIX ACL.
 365 *********************************************************************/
 366
 367 static int sys_acl_set_fd_tdb(vfs_handle_struct *handle,
 368                             files_struct *fsp,
 369                             SMB_ACL_T theacl)
 370 {
 371         struct db_context *db = acl_db;
 372         NTSTATUS status;
 373         int ret;
 374
 375         status = vfs_stat_fsp(fsp);
 376         if (!NT_STATUS_IS_OK(status)) {
 377                 return -1;
 378         }
 379
 380         ret = SMB_VFS_NEXT_SYS_ACL_SET_FD(handle,
 381                                                 fsp,
 382                                                 theacl);
 383         if (ret == -1) {
 384                 return -1;
 385         }
 386
 387         acl_tdb_delete(handle, db, &fsp->fsp_name->st);
 388         return 0;
 389 }
 390
 391 static struct vfs_fn_pointers vfs_acl_tdb_fns = {
 392         .connect_fn = connect_acl_tdb,
 393         .disconnect = disconnect_acl_tdb,
 394         .opendir = opendir_acl_common,
 395         .mkdir = mkdir_acl_common,
 396         .open = open_acl_common,
 397         .create_file = create_file_acl_common,
 398         .unlink = unlink_acl_tdb,
 399         .rmdir = rmdir_acl_tdb,
 400         .fget_nt_acl = fget_nt_acl_common,
 401         .get_nt_acl = get_nt_acl_common,
 402         .fset_nt_acl = fset_nt_acl_common,
 403         .sys_acl_set_file = sys_acl_set_file_tdb,
 404         .sys_acl_set_fd = sys_acl_set_fd_tdb
 405 };
 406
 407 NTSTATUS vfs_acl_tdb_init(void)
 408 {
 409         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_tdb",
 410                                 &vfs_acl_tdb_fns);
 411 }