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/*
Unix SMB/CIFS implementation.
POSIX NTVFS backend - NT ACLs in xattrs
Copyright (C) Andrew Tridgell 2006
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 "vfs_posix.h"
#include "../lib/util/unix_privs.h"
#include "librpc/gen_ndr/ndr_xattr.h"
/*
load the current ACL from extended attributes
*/
static NTSTATUS pvfs_acl_load_xattr(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd,
TALLOC_CTX *mem_ctx,
struct security_descriptor **sd)
{
NTSTATUS status;
struct xattr_NTACL *acl;
if (!(pvfs->flags & PVFS_FLAG_XATTR_ENABLE)) {
return NT_STATUS_NOT_FOUND;
}
acl = talloc_zero(mem_ctx, struct xattr_NTACL);
NT_STATUS_HAVE_NO_MEMORY(acl);
status = pvfs_xattr_ndr_load(pvfs, mem_ctx, name->full_name, fd,
XATTR_NTACL_NAME,
acl,
(ndr_pull_flags_fn_t)ndr_pull_xattr_NTACL);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(acl);
return status;
}
if (acl->version != 1) {
talloc_free(acl);
return NT_STATUS_INVALID_ACL;
}
*sd = talloc_steal(mem_ctx, acl->info.sd);
return NT_STATUS_OK;
}
/*
save the acl for a file into filesystem xattr
*/
static NTSTATUS pvfs_acl_save_xattr(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd,
struct security_descriptor *sd)
{
NTSTATUS status;
void *privs;
struct xattr_NTACL acl;
if (!(pvfs->flags & PVFS_FLAG_XATTR_ENABLE)) {
return NT_STATUS_OK;
}
acl.version = 1;
acl.info.sd = sd;
/* this xattr is in the "system" namespace, so we need
admin privileges to set it */
privs = root_privileges();
status = pvfs_xattr_ndr_save(pvfs, name->full_name, fd,
XATTR_NTACL_NAME,
&acl,
(ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
talloc_free(privs);
return status;
}
/*
initialise pvfs acl xattr backend
*/
NTSTATUS pvfs_acl_xattr_init(void)
{
struct pvfs_acl_ops ops = {
.name = "xattr",
.acl_load = pvfs_acl_load_xattr,
.acl_save = pvfs_acl_save_xattr
};
return pvfs_acl_register(&ops);
}
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