2 * Fake ACLs VFS module. Implements passthrough operation of all VFS
3 * calls to disk functions, except for file ownership and ACLs, which
4 * are stored in xattrs.
6 * Copyright (C) Tim Potter, 1999-2000
7 * Copyright (C) Alexander Bokovoy, 2002
8 * Copyright (C) Andrew Bartlett, 2002,2012
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 3 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, see <http://www.gnu.org/licenses/>.
25 #include "smbd/smbd.h"
26 #include "system/filesys.h"
28 #include "librpc/gen_ndr/ndr_smb_acl.h"
31 #define DBGC_CLASS DBGC_VFS
33 #define FAKE_UID "system.fake_uid"
34 #define FAKE_GID "system.fake_gid"
35 #define FAKE_ACL_ACCESS_XATTR "system.fake_access_acl"
36 #define FAKE_ACL_DEFAULT_XATTR "system.fake_default_acl"
38 static int fake_acls_uid(vfs_handle_struct *handle,
39 struct smb_filename *smb_fname,
44 size = SMB_VFS_NEXT_GETXATTR(handle, smb_fname,
45 FAKE_UID, uid_buf, sizeof(uid_buf));
46 if (size == -1 && errno == ENOATTR) {
52 *uid = IVAL(uid_buf, 0);
56 static int fake_acls_gid(vfs_handle_struct *handle,
57 struct smb_filename *smb_fname,
63 size = SMB_VFS_NEXT_GETXATTR(handle, smb_fname,
64 FAKE_GID, gid_buf, sizeof(gid_buf));
65 if (size == -1 && errno == ENOATTR) {
71 *gid = IVAL(gid_buf, 0);
75 static int fake_acls_fuid(vfs_handle_struct *handle,
82 size = SMB_VFS_NEXT_FGETXATTR(handle, fsp, FAKE_UID, uid_buf, sizeof(uid_buf));
83 if (size == -1 && errno == ENOATTR) {
89 *uid = IVAL(uid_buf, 0);
93 static int fake_acls_fgid(vfs_handle_struct *handle,
100 size = SMB_VFS_NEXT_FGETXATTR(handle, fsp, FAKE_GID, gid_buf, sizeof(gid_buf));
101 if (size == -1 && errno == ENOATTR) {
107 *gid = IVAL(gid_buf, 0);
111 static int fake_acls_stat(vfs_handle_struct *handle,
112 struct smb_filename *smb_fname)
116 ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
118 TALLOC_CTX *frame = talloc_stackframe();
120 struct smb_filename smb_fname_base = {
121 .base_name = smb_fname->base_name
125 * As we're calling getxattr directly here
126 * we need to use only the base_name, not
127 * the full name containing any stream name.
129 status = get_full_smb_filename(frame, &smb_fname_base, &path);
130 if (!NT_STATUS_IS_OK(status)) {
131 errno = map_errno_from_nt_status(status);
136 ret = fake_acls_uid(handle, &smb_fname_base,
137 &smb_fname->st.st_ex_uid);
142 ret = fake_acls_gid(handle, &smb_fname_base,
143 &smb_fname->st.st_ex_gid);
154 static int fake_acls_lstat(vfs_handle_struct *handle,
155 struct smb_filename *smb_fname)
159 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
161 TALLOC_CTX *frame = talloc_stackframe();
163 struct smb_filename smb_fname_base = {
164 .base_name = smb_fname->base_name
168 * As we're calling getxattr directly here
169 * we need to use only the base_name, not
170 * the full name containing any stream name.
172 status = get_full_smb_filename(frame, &smb_fname_base, &path);
173 if (!NT_STATUS_IS_OK(status)) {
174 errno = map_errno_from_nt_status(status);
179 /* This isn't quite right (calling getxattr not
180 * lgetxattr), but for the test purposes of this
181 * module (fake NT ACLs from windows clients), it is
182 * close enough. We removed the l*xattr functions
183 * because linux doesn't support using them, but we
184 * could fake them in xattr_tdb if we really wanted
185 * to. We ignore errors because the link might not point anywhere */
186 fake_acls_uid(handle, &smb_fname_base,
187 &smb_fname->st.st_ex_uid);
188 fake_acls_gid(handle, &smb_fname_base,
189 &smb_fname->st.st_ex_gid);
196 static int fake_acls_fstat(vfs_handle_struct *handle, files_struct *fsp, SMB_STRUCT_STAT *sbuf)
200 ret = SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
202 ret = fake_acls_fuid(handle, fsp, &sbuf->st_ex_uid);
206 ret = fake_acls_fgid(handle, fsp, &sbuf->st_ex_gid);
214 static SMB_ACL_T fake_acls_blob2acl(DATA_BLOB *blob, TALLOC_CTX *mem_ctx)
216 enum ndr_err_code ndr_err;
217 struct smb_acl_t *acl = talloc(mem_ctx, struct smb_acl_t);
223 ndr_err = ndr_pull_struct_blob(blob, acl, acl,
224 (ndr_pull_flags_fn_t)ndr_pull_smb_acl_t);
226 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
227 DEBUG(0, ("ndr_pull_acl_t failed: %s\n",
228 ndr_errstr(ndr_err)));
235 static DATA_BLOB fake_acls_acl2blob(TALLOC_CTX *mem_ctx, SMB_ACL_T acl)
237 enum ndr_err_code ndr_err;
239 ndr_err = ndr_push_struct_blob(&blob, mem_ctx, acl,
240 (ndr_push_flags_fn_t)ndr_push_smb_acl_t);
242 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
243 DEBUG(0, ("ndr_push_acl_t failed: %s\n",
244 ndr_errstr(ndr_err)));
245 return data_blob_null;
250 static SMB_ACL_T fake_acls_sys_acl_get_file(struct vfs_handle_struct *handle,
251 const struct smb_filename *smb_fname,
255 DATA_BLOB blob = data_blob_null;
257 const char *name = NULL;
258 struct smb_acl_t *acl = NULL;
259 TALLOC_CTX *frame = talloc_stackframe();
261 case SMB_ACL_TYPE_ACCESS:
262 name = FAKE_ACL_ACCESS_XATTR;
264 case SMB_ACL_TYPE_DEFAULT:
265 name = FAKE_ACL_DEFAULT_XATTR;
271 blob.data = talloc_realloc(frame, blob.data, uint8_t, blob.length);
277 length = SMB_VFS_NEXT_GETXATTR(handle, smb_fname,
278 name, blob.data, blob.length);
279 blob.length = length;
280 } while (length == -1 && errno == ERANGE);
281 if (length == -1 && errno == ENOATTR) {
286 acl = fake_acls_blob2acl(&blob, mem_ctx);
292 static SMB_ACL_T fake_acls_sys_acl_get_fd(struct vfs_handle_struct *handle,
296 DATA_BLOB blob = data_blob_null;
298 const char *name = FAKE_ACL_ACCESS_XATTR;
299 struct smb_acl_t *acl = NULL;
300 TALLOC_CTX *frame = talloc_stackframe();
304 blob.data = talloc_realloc(frame, blob.data, uint8_t, blob.length);
310 length = SMB_VFS_NEXT_FGETXATTR(handle, fsp, name, blob.data, blob.length);
311 blob.length = length;
312 } while (length == -1 && errno == ERANGE);
313 if (length == -1 && errno == ENOATTR) {
318 acl = fake_acls_blob2acl(&blob, mem_ctx);
325 static int fake_acls_sys_acl_set_file(vfs_handle_struct *handle,
326 const struct smb_filename *smb_fname,
327 SMB_ACL_TYPE_T acltype,
331 const char *name = NULL;
332 TALLOC_CTX *frame = talloc_stackframe();
333 DATA_BLOB blob = fake_acls_acl2blob(frame, theacl);
335 DEBUG(0, ("Failed to convert ACL to linear blob for xattr storage\n"));
341 case SMB_ACL_TYPE_ACCESS:
342 name = FAKE_ACL_ACCESS_XATTR;
344 case SMB_ACL_TYPE_DEFAULT:
345 name = FAKE_ACL_DEFAULT_XATTR;
348 ret = SMB_VFS_NEXT_SETXATTR(handle, smb_fname,
349 name, blob.data, blob.length, 0);
354 static int fake_acls_sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp, SMB_ACL_T theacl)
357 const char *name = FAKE_ACL_ACCESS_XATTR;
358 TALLOC_CTX *frame = talloc_stackframe();
359 DATA_BLOB blob = fake_acls_acl2blob(frame, theacl);
361 DEBUG(0, ("Failed to convert ACL to linear blob for xattr storage\n"));
366 ret = SMB_VFS_NEXT_FSETXATTR(handle, fsp, name, blob.data, blob.length, 0);
371 static int fake_acls_sys_acl_delete_def_file(vfs_handle_struct *handle,
372 const struct smb_filename *smb_fname_in)
375 const char *name = FAKE_ACL_DEFAULT_XATTR;
376 TALLOC_CTX *frame = talloc_stackframe();
377 struct smb_filename *smb_fname = cp_smb_filename_nostream(talloc_tos(),
380 if (smb_fname == NULL) {
386 ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
392 if (!S_ISDIR(smb_fname->st.st_ex_mode)) {
398 ret = SMB_VFS_NEXT_REMOVEXATTR(handle, smb_fname, name);
399 if (ret == -1 && errno == ENOATTR) {
408 static int fake_acls_chown(vfs_handle_struct *handle,
409 const struct smb_filename *smb_fname,
416 uid_t current_uid = get_current_uid(handle->conn);
418 if (current_uid != 0 && current_uid != uid) {
422 SIVAL(id_buf, 0, uid);
423 ret = SMB_VFS_NEXT_SETXATTR(handle,
434 SIVAL(id_buf, 0, gid);
435 ret = SMB_VFS_NEXT_SETXATTR(handle,
448 static int fake_acls_lchown(vfs_handle_struct *handle,
449 const struct smb_filename *smb_fname,
456 uid_t current_uid = get_current_uid(handle->conn);
458 if (current_uid != 0 && current_uid != uid) {
462 /* This isn't quite right (calling setxattr not
463 * lsetxattr), but for the test purposes of this
464 * module (fake NT ACLs from windows clients), it is
465 * close enough. We removed the l*xattr functions
466 * because linux doesn't support using them, but we
467 * could fake them in xattr_tdb if we really wanted
470 SIVAL(id_buf, 0, uid);
471 ret = SMB_VFS_NEXT_SETXATTR(handle,
482 SIVAL(id_buf, 0, gid);
483 ret = SMB_VFS_NEXT_SETXATTR(handle,
496 static int fake_acls_fchown(vfs_handle_struct *handle, files_struct *fsp, uid_t uid, gid_t gid)
501 uid_t current_uid = get_current_uid(handle->conn);
503 if (current_uid != 0 && current_uid != uid) {
507 SIVAL(id_buf, 0, uid);
508 ret = SMB_VFS_NEXT_FSETXATTR(handle, fsp, FAKE_UID, id_buf, sizeof(id_buf), 0);
514 SIVAL(id_buf, 0, gid);
515 ret = SMB_VFS_NEXT_FSETXATTR(handle, fsp, FAKE_GID, id_buf, sizeof(id_buf), 0);
524 static struct vfs_fn_pointers vfs_fake_acls_fns = {
525 .stat_fn = fake_acls_stat,
526 .lstat_fn = fake_acls_lstat,
527 .fstat_fn = fake_acls_fstat,
528 .sys_acl_get_file_fn = fake_acls_sys_acl_get_file,
529 .sys_acl_get_fd_fn = fake_acls_sys_acl_get_fd,
530 .sys_acl_blob_get_file_fn = posix_sys_acl_blob_get_file,
531 .sys_acl_blob_get_fd_fn = posix_sys_acl_blob_get_fd,
532 .sys_acl_set_file_fn = fake_acls_sys_acl_set_file,
533 .sys_acl_set_fd_fn = fake_acls_sys_acl_set_fd,
534 .sys_acl_delete_def_file_fn = fake_acls_sys_acl_delete_def_file,
535 .chown_fn = fake_acls_chown,
536 .lchown_fn = fake_acls_lchown,
537 .fchown_fn = fake_acls_fchown,
541 NTSTATUS vfs_fake_acls_init(TALLOC_CTX *);
542 NTSTATUS vfs_fake_acls_init(TALLOC_CTX *ctx)
544 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "fake_acls",