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/*
* Store Windows ACLs in xattrs.
*
* Copyright (C) Volker Lendecke, 2008
* Copyright (C) Jeremy Allison, 2008
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "smbd/smbd.h"
#include "librpc/gen_ndr/xattr.h"
#include "librpc/gen_ndr/ndr_xattr.h"
#include "../lib/crypto/crypto.h"
#include "auth.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_VFS
/* Pull in the common functions. */
#define ACL_MODULE_NAME "acl_xattr"
#include "modules/vfs_acl_common.c"
/*******************************************************************
Pull a security descriptor into a DATA_BLOB from a xattr.
*******************************************************************/
static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
vfs_handle_struct *handle,
files_struct *fsp,
const char *name,
DATA_BLOB *pblob)
{
size_t size = 1024;
uint8_t *val = NULL;
uint8_t *tmp;
ssize_t sizeret;
int saved_errno = 0;
ZERO_STRUCTP(pblob);
again:
tmp = talloc_realloc(ctx, val, uint8_t, size);
if (tmp == NULL) {
TALLOC_FREE(val);
return NT_STATUS_NO_MEMORY;
}
val = tmp;
become_root();
if (fsp && fsp->fh->fd != -1) {
sizeret = SMB_VFS_FGETXATTR(fsp, XATTR_NTACL_NAME, val, size);
} else {
sizeret = SMB_VFS_GETXATTR(handle->conn, name,
XATTR_NTACL_NAME, val, size);
}
if (sizeret == -1) {
saved_errno = errno;
}
unbecome_root();
/* Max ACL size is 65536 bytes. */
if (sizeret == -1) {
errno = saved_errno;
if ((errno == ERANGE) && (size != 65536)) {
/* Too small, try again. */
size = 65536;
goto again;
}
/* Real error - exit here. */
TALLOC_FREE(val);
return map_nt_error_from_unix(errno);
}
pblob->data = val;
pblob->length = sizeret;
return NT_STATUS_OK;
}
/*******************************************************************
Store a DATA_BLOB into an xattr given an fsp pointer.
*******************************************************************/
static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
files_struct *fsp,
DATA_BLOB *pblob)
{
int ret;
int saved_errno = 0;
DEBUG(10,("store_acl_blob_fsp: storing blob length %u on file %s\n",
(unsigned int)pblob->length, fsp_str_dbg(fsp)));
become_root();
if (fsp->fh->fd != -1) {
ret = SMB_VFS_FSETXATTR(fsp, XATTR_NTACL_NAME,
pblob->data, pblob->length, 0);
} else {
ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
XATTR_NTACL_NAME,
pblob->data, pblob->length, 0);
}
if (ret) {
saved_errno = errno;
}
unbecome_root();
if (ret) {
errno = saved_errno;
DEBUG(5, ("store_acl_blob_fsp: setting attr failed for file %s"
"with error %s\n",
fsp_str_dbg(fsp),
strerror(errno) ));
return map_nt_error_from_unix(errno);
}
return NT_STATUS_OK;
}
/*********************************************************************
Remove a Windows ACL - we're setting the underlying POSIX ACL.
*********************************************************************/
static int sys_acl_set_file_xattr(vfs_handle_struct *handle,
const char *name,
SMB_ACL_TYPE_T type,
SMB_ACL_T theacl)
{
int ret = SMB_VFS_NEXT_SYS_ACL_SET_FILE(handle,
name,
type,
theacl);
if (ret == -1) {
return -1;
}
become_root();
SMB_VFS_REMOVEXATTR(handle->conn, name, XATTR_NTACL_NAME);
unbecome_root();
return ret;
}
/*********************************************************************
Remove a Windows ACL - we're setting the underlying POSIX ACL.
*********************************************************************/
static int sys_acl_set_fd_xattr(vfs_handle_struct *handle,
files_struct *fsp,
SMB_ACL_T theacl)
{
int ret = SMB_VFS_NEXT_SYS_ACL_SET_FD(handle,
fsp,
theacl);
if (ret == -1) {
return -1;
}
become_root();
SMB_VFS_FREMOVEXATTR(fsp, XATTR_NTACL_NAME);
unbecome_root();
return ret;
}
static int connect_acl_xattr(struct vfs_handle_struct *handle,
const char *service,
const char *user)
{
int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
if (ret < 0) {
return ret;
}
/* Ensure we have the parameters correct if we're
* using this module. */
DEBUG(2,("connect_acl_xattr: setting 'inherit acls = true' "
"'dos filemode = true' and "
"'force unknown acl user = true' for service %s\n",
service ));
lp_do_parameter(SNUM(handle->conn), "inherit acls", "true");
lp_do_parameter(SNUM(handle->conn), "dos filemode", "true");
lp_do_parameter(SNUM(handle->conn), "force unknown acl user", "true");
return 0;
}
static struct vfs_fn_pointers vfs_acl_xattr_fns = {
.connect_fn = connect_acl_xattr,
.rmdir = rmdir_acl_common,
.unlink = unlink_acl_common,
.chmod = chmod_acl_module_common,
.fchmod = fchmod_acl_module_common,
.fget_nt_acl = fget_nt_acl_common,
.get_nt_acl = get_nt_acl_common,
.fset_nt_acl = fset_nt_acl_common,
.chmod_acl = chmod_acl_acl_module_common,
.fchmod_acl = fchmod_acl_acl_module_common,
.sys_acl_set_file = sys_acl_set_file_xattr,
.sys_acl_set_fd = sys_acl_set_fd_xattr
};
NTSTATUS vfs_acl_xattr_init(void)
{
return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_xattr",
&vfs_acl_xattr_fns);
}
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