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ccb4f791fd
EA's and ACL paths are all post-stream name checks (and shouldn't get stream names). This one took a *long* time to find. BUG: https://bugzilla.samba.org/show_bug.cgi?id=11249 Signed-off-by: Jeremy Allison <jra@samba.org> Reviewed-by: Andreas Schneider <asn@samba.org> Reviewed-by: Ralph Boehme <slow@samba.org>
501 lines
11 KiB
C
501 lines
11 KiB
C
/*
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* Store posix-level xattrs in a tdb
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*
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* Copyright (C) Volker Lendecke, 2007
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* Copyright (C) Andrew Bartlett, 2012
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "system/filesys.h"
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#include "smbd/smbd.h"
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#include "dbwrap/dbwrap.h"
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#include "dbwrap/dbwrap_open.h"
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#include "source3/lib/xattr_tdb.h"
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#undef DBGC_CLASS
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#define DBGC_CLASS DBGC_VFS
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static bool xattr_tdb_init(int snum, TALLOC_CTX *mem_ctx, struct db_context **p_db);
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static int xattr_tdb_get_file_id(struct vfs_handle_struct *handle,
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const char *path, struct file_id *id)
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{
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int ret;
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TALLOC_CTX *frame = talloc_stackframe();
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struct smb_filename *smb_fname;
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smb_fname = synthetic_smb_fname(frame, path, NULL, NULL);
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if (smb_fname == NULL) {
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TALLOC_FREE(frame);
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errno = ENOMEM;
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return -1;
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}
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ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
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if (ret == -1) {
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TALLOC_FREE(frame);
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return -1;
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}
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*id = SMB_VFS_NEXT_FILE_ID_CREATE(handle, &smb_fname->st);
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TALLOC_FREE(frame);
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return 0;
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}
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static ssize_t xattr_tdb_getxattr(struct vfs_handle_struct *handle,
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const char *path, const char *name,
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void *value, size_t size)
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{
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struct file_id id;
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struct db_context *db;
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ssize_t xattr_size;
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int ret;
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DATA_BLOB blob;
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TALLOC_CTX *frame = talloc_stackframe();
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SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
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if (!xattr_tdb_init(-1, frame, &db))
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{
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TALLOC_FREE(frame); return -1;
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});
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ret = xattr_tdb_get_file_id(handle, path, &id);
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if (ret == -1) {
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TALLOC_FREE(frame);
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return -1;
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}
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xattr_size = xattr_tdb_getattr(db, frame, &id, name, &blob);
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if (xattr_size < 0) {
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errno = ENOATTR;
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TALLOC_FREE(frame);
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return -1;
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}
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if (blob.length > size) {
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TALLOC_FREE(frame);
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errno = ERANGE;
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return -1;
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}
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memcpy(value, blob.data, xattr_size);
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TALLOC_FREE(frame);
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return xattr_size;
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}
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static ssize_t xattr_tdb_fgetxattr(struct vfs_handle_struct *handle,
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struct files_struct *fsp,
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const char *name, void *value, size_t size)
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{
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SMB_STRUCT_STAT sbuf;
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struct file_id id;
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struct db_context *db;
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ssize_t xattr_size;
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DATA_BLOB blob;
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TALLOC_CTX *frame = talloc_stackframe();
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SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
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if (!xattr_tdb_init(-1, frame, &db))
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{
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TALLOC_FREE(frame); return -1;
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});
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if (SMB_VFS_NEXT_FSTAT(handle, fsp, &sbuf) == -1) {
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TALLOC_FREE(frame);
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return -1;
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}
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id = SMB_VFS_NEXT_FILE_ID_CREATE(handle, &sbuf);
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xattr_size = xattr_tdb_getattr(db, frame, &id, name, &blob);
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if (xattr_size < 0) {
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errno = ENOATTR;
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TALLOC_FREE(frame);
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return -1;
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}
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if (blob.length > size) {
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TALLOC_FREE(frame);
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errno = ERANGE;
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return -1;
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}
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memcpy(value, blob.data, xattr_size);
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TALLOC_FREE(frame);
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return xattr_size;
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}
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static int xattr_tdb_setxattr(struct vfs_handle_struct *handle,
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const char *path, const char *name,
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const void *value, size_t size, int flags)
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{
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struct file_id id;
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struct db_context *db;
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int ret;
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TALLOC_CTX *frame = talloc_stackframe();
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SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
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if (!xattr_tdb_init(-1, frame, &db))
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{
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TALLOC_FREE(frame); return -1;
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});
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ret = xattr_tdb_get_file_id(handle, path, &id);
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if (ret == -1) {
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TALLOC_FREE(frame);
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return -1;
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}
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ret = xattr_tdb_setattr(db, &id, name, value, size, flags);
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TALLOC_FREE(frame);
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return ret;
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}
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static int xattr_tdb_fsetxattr(struct vfs_handle_struct *handle,
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struct files_struct *fsp,
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const char *name, const void *value,
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size_t size, int flags)
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{
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SMB_STRUCT_STAT sbuf;
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struct file_id id;
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struct db_context *db;
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int ret;
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TALLOC_CTX *frame = talloc_stackframe();
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SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
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if (!xattr_tdb_init(-1, frame, &db))
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{
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TALLOC_FREE(frame); return -1;
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});
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if (SMB_VFS_NEXT_FSTAT(handle, fsp, &sbuf) == -1) {
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TALLOC_FREE(frame);
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return -1;
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}
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id = SMB_VFS_NEXT_FILE_ID_CREATE(handle, &sbuf);
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ret = xattr_tdb_setattr(db, &id, name, value, size, flags);
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TALLOC_FREE(frame);
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return ret;
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}
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static ssize_t xattr_tdb_listxattr(struct vfs_handle_struct *handle,
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const char *path, char *list, size_t size)
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{
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struct file_id id;
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struct db_context *db;
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int ret;
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TALLOC_CTX *frame = talloc_stackframe();
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SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
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if (!xattr_tdb_init(-1, frame, &db))
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{
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TALLOC_FREE(frame); return -1;
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});
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ret = xattr_tdb_get_file_id(handle, path, &id);
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if (ret == -1) {
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TALLOC_FREE(frame);
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return -1;
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}
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ret = xattr_tdb_listattr(db, &id, list, size);
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TALLOC_FREE(frame);
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return ret;
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}
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static ssize_t xattr_tdb_flistxattr(struct vfs_handle_struct *handle,
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struct files_struct *fsp, char *list,
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size_t size)
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{
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SMB_STRUCT_STAT sbuf;
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struct file_id id;
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struct db_context *db;
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int ret;
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TALLOC_CTX *frame = talloc_stackframe();
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SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
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if (!xattr_tdb_init(-1, frame, &db))
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{
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TALLOC_FREE(frame); return -1;
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});
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if (SMB_VFS_NEXT_FSTAT(handle, fsp, &sbuf) == -1) {
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TALLOC_FREE(frame);
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return -1;
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}
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id = SMB_VFS_NEXT_FILE_ID_CREATE(handle, &sbuf);
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ret = xattr_tdb_listattr(db, &id, list, size);
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TALLOC_FREE(frame);
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return ret;
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}
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static int xattr_tdb_removexattr(struct vfs_handle_struct *handle,
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const char *path, const char *name)
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{
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struct file_id id;
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struct db_context *db;
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int ret;
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TALLOC_CTX *frame = talloc_stackframe();
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SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
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if (!xattr_tdb_init(-1, frame, &db))
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{
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TALLOC_FREE(frame); return -1;
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});
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ret = xattr_tdb_get_file_id(handle, path, &id);
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if (ret == -1) {
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TALLOC_FREE(frame);
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return ret;
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}
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ret = xattr_tdb_removeattr(db, &id, name);
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TALLOC_FREE(frame);
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return ret;
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}
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static int xattr_tdb_fremovexattr(struct vfs_handle_struct *handle,
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struct files_struct *fsp, const char *name)
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{
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SMB_STRUCT_STAT sbuf;
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struct file_id id;
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struct db_context *db;
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int ret;
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TALLOC_CTX *frame = talloc_stackframe();
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SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
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if (!xattr_tdb_init(-1, frame, &db))
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{
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TALLOC_FREE(frame); return -1;
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});
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if (SMB_VFS_NEXT_FSTAT(handle, fsp, &sbuf) == -1) {
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TALLOC_FREE(frame);
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return -1;
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}
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id = SMB_VFS_NEXT_FILE_ID_CREATE(handle, &sbuf);
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ret = xattr_tdb_removeattr(db, &id, name);
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TALLOC_FREE(frame);
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return ret;
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}
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/*
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* Open the tdb file upon VFS_CONNECT
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*/
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static bool xattr_tdb_init(int snum, TALLOC_CTX *mem_ctx, struct db_context **p_db)
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{
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struct db_context *db;
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const char *dbname;
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char *def_dbname;
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def_dbname = state_path("xattr.tdb");
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if (def_dbname == NULL) {
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errno = ENOSYS;
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return false;
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}
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dbname = lp_parm_const_string(snum, "xattr_tdb", "file", def_dbname);
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/* now we know dbname is not NULL */
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become_root();
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db = db_open(NULL, dbname, 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600,
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DBWRAP_LOCK_ORDER_2, DBWRAP_FLAG_NONE);
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unbecome_root();
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if (db == NULL) {
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#if defined(ENOTSUP)
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errno = ENOTSUP;
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#else
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errno = ENOSYS;
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#endif
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TALLOC_FREE(def_dbname);
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return false;
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}
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*p_db = db;
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TALLOC_FREE(def_dbname);
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return true;
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}
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/*
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* On unlink we need to delete the tdb record
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*/
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static int xattr_tdb_unlink(vfs_handle_struct *handle,
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const struct smb_filename *smb_fname)
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{
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struct smb_filename *smb_fname_tmp = NULL;
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struct file_id id;
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struct db_context *db;
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int ret = -1;
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bool remove_record = false;
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TALLOC_CTX *frame = talloc_stackframe();
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SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
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if (!xattr_tdb_init(-1, frame, &db))
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{
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TALLOC_FREE(frame); return -1;
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});
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smb_fname_tmp = cp_smb_filename(frame, smb_fname);
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if (smb_fname_tmp == NULL) {
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TALLOC_FREE(frame);
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errno = ENOMEM;
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return -1;
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}
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if (lp_posix_pathnames()) {
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ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_tmp);
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} else {
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ret = SMB_VFS_NEXT_STAT(handle, smb_fname_tmp);
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}
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if (ret == -1) {
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goto out;
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}
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if (smb_fname_tmp->st.st_ex_nlink == 1) {
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/* Only remove record on last link to file. */
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remove_record = true;
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}
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ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname_tmp);
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if (ret == -1) {
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goto out;
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}
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if (!remove_record) {
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goto out;
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}
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id = SMB_VFS_NEXT_FILE_ID_CREATE(handle, &smb_fname_tmp->st);
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xattr_tdb_remove_all_attrs(db, &id);
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out:
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TALLOC_FREE(frame);
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return ret;
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}
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/*
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* On rmdir we need to delete the tdb record
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*/
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static int xattr_tdb_rmdir(vfs_handle_struct *handle, const char *path)
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{
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SMB_STRUCT_STAT sbuf;
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struct file_id id;
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struct db_context *db;
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int ret;
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TALLOC_CTX *frame = talloc_stackframe();
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SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
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if (!xattr_tdb_init(-1, frame, &db))
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{
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TALLOC_FREE(frame); return -1;
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});
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if (vfs_stat_smb_basename(handle->conn, path, &sbuf) == -1) {
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TALLOC_FREE(frame);
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return -1;
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}
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ret = SMB_VFS_NEXT_RMDIR(handle, path);
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if (ret == -1) {
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TALLOC_FREE(frame);
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return -1;
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}
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id = SMB_VFS_NEXT_FILE_ID_CREATE(handle, &sbuf);
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xattr_tdb_remove_all_attrs(db, &id);
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TALLOC_FREE(frame);
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return 0;
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}
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/*
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* Destructor for the VFS private data
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*/
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static void close_xattr_db(void **data)
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{
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struct db_context **p_db = (struct db_context **)data;
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TALLOC_FREE(*p_db);
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}
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static int xattr_tdb_connect(vfs_handle_struct *handle, const char *service,
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const char *user)
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{
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char *sname = NULL;
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int res, snum;
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struct db_context *db;
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res = SMB_VFS_NEXT_CONNECT(handle, service, user);
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if (res < 0) {
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return res;
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}
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snum = find_service(talloc_tos(), service, &sname);
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if (snum == -1 || sname == NULL) {
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/*
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* Should not happen, but we should not fail just *here*.
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*/
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return 0;
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}
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if (!xattr_tdb_init(snum, NULL, &db)) {
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DEBUG(5, ("Could not init xattr tdb\n"));
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lp_do_parameter(snum, "ea support", "False");
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return 0;
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}
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lp_do_parameter(snum, "ea support", "True");
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SMB_VFS_HANDLE_SET_DATA(handle, db, close_xattr_db,
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struct db_context, return -1);
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return 0;
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}
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static struct vfs_fn_pointers vfs_xattr_tdb_fns = {
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.getxattr_fn = xattr_tdb_getxattr,
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.fgetxattr_fn = xattr_tdb_fgetxattr,
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.setxattr_fn = xattr_tdb_setxattr,
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.fsetxattr_fn = xattr_tdb_fsetxattr,
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.listxattr_fn = xattr_tdb_listxattr,
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.flistxattr_fn = xattr_tdb_flistxattr,
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.removexattr_fn = xattr_tdb_removexattr,
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.fremovexattr_fn = xattr_tdb_fremovexattr,
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.unlink_fn = xattr_tdb_unlink,
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.rmdir_fn = xattr_tdb_rmdir,
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.connect_fn = xattr_tdb_connect,
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};
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NTSTATUS vfs_xattr_tdb_init(void);
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NTSTATUS vfs_xattr_tdb_init(void)
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{
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return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "xattr_tdb",
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&vfs_xattr_tdb_fns);
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}
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