~zulcss/samba/server-dailies-3.4 : contents of source3/modules/vfs_acl

~zulcss/samba/server-dailies-3.4 : (revision 1)

/*
 * 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/>.
 */

/* NOTE: This is an experimental module, not yet finished. JRA. */

#include "includes.h"
#include "librpc/gen_ndr/xattr.h"
#include "librpc/gen_ndr/ndr_xattr.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_VFS

/*******************************************************************
 Parse out a struct security_descriptor from a DATA_BLOB.
*******************************************************************/

static NTSTATUS parse_acl_blob(const DATA_BLOB *pblob,
				uint32 security_info,
				struct security_descriptor **ppdesc)
{
	TALLOC_CTX *ctx = talloc_tos();
	struct xattr_NTACL xacl;
	enum ndr_err_code ndr_err;
	size_t sd_size;

	ndr_err = ndr_pull_struct_blob(pblob, ctx, NULL, &xacl,
			(ndr_pull_flags_fn_t)ndr_pull_xattr_NTACL);

	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
		DEBUG(5, ("parse_acl_blob: ndr_pull_xattr_NTACL failed: %s\n",
			ndr_errstr(ndr_err)));
		return ndr_map_error2ntstatus(ndr_err);;
	}

	if (xacl.version != 2) {
		return NT_STATUS_REVISION_MISMATCH;
	}

	*ppdesc = make_sec_desc(ctx, SEC_DESC_REVISION, xacl.info.sd_hs->sd->type | SEC_DESC_SELF_RELATIVE,
			(security_info & OWNER_SECURITY_INFORMATION)
			? xacl.info.sd_hs->sd->owner_sid : NULL,
			(security_info & GROUP_SECURITY_INFORMATION)
			? xacl.info.sd_hs->sd->group_sid : NULL,
			(security_info & SACL_SECURITY_INFORMATION)
			? xacl.info.sd_hs->sd->sacl : NULL,
			(security_info & DACL_SECURITY_INFORMATION)
			? xacl.info.sd_hs->sd->dacl : NULL,
			&sd_size);

	TALLOC_FREE(xacl.info.sd);

	return (*ppdesc != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
}

/*******************************************************************
 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_ARRAY(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;
}

/*******************************************************************
 Create a DATA_BLOB from a security descriptor.
*******************************************************************/

static NTSTATUS create_acl_blob(const struct security_descriptor *psd, DATA_BLOB *pblob)
{
	struct xattr_NTACL xacl;
	struct security_descriptor_hash sd_hs;
	enum ndr_err_code ndr_err;
	TALLOC_CTX *ctx = talloc_tos();

	ZERO_STRUCT(xacl);
	ZERO_STRUCT(sd_hs);

	xacl.version = 2;
	xacl.info.sd_hs = &sd_hs;
	xacl.info.sd_hs->sd = CONST_DISCARD(struct security_descriptor *, psd);
	memset(&xacl.info.sd_hs->hash[0], '\0', 16);

	ndr_err = ndr_push_struct_blob(
			pblob, ctx, NULL, &xacl,
			(ndr_push_flags_fn_t)ndr_push_xattr_NTACL);

	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
		DEBUG(5, ("create_acl_blob: ndr_push_xattr_NTACL failed: %s\n",
			ndr_errstr(ndr_err)));
		return ndr_map_error2ntstatus(ndr_err);;
	}

	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->fsp_name));

	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,
				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->fsp_name,
			strerror(errno) ));
		return map_nt_error_from_unix(errno);
	}
	return NT_STATUS_OK;
}

/*******************************************************************
 Store a DATA_BLOB into an xattr given a pathname.
*******************************************************************/

static NTSTATUS store_acl_blob_pathname(vfs_handle_struct *handle,
					const char *fname,
					DATA_BLOB *pblob)
{
	connection_struct *conn = handle->conn;
	int ret;
	int saved_errno = 0;

	DEBUG(10,("store_acl_blob_pathname: storing blob "
			"length %u on file %s\n",
			(unsigned int)pblob->length, fname));

	become_root();
	ret = SMB_VFS_SETXATTR(conn, fname,
				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_pathname: setting attr failed "
			"for file %s with error %s\n",
			fname,
			strerror(errno) ));
		return map_nt_error_from_unix(errno);
	}
	return NT_STATUS_OK;
}

/*******************************************************************
 Store a DATA_BLOB into an xattr given a pathname.
*******************************************************************/

static NTSTATUS get_nt_acl_xattr_internal(vfs_handle_struct *handle,
					files_struct *fsp,
					const char *name,
				        uint32 security_info,
					struct security_descriptor **ppdesc)
{
	TALLOC_CTX *ctx = talloc_tos();
	DATA_BLOB blob;
	NTSTATUS status;

	if (fsp && name == NULL) {
		name = fsp->fsp_name;
	}

	DEBUG(10, ("get_nt_acl_xattr_internal: name=%s\n", name));

	status = get_acl_blob(ctx, handle, fsp, name, &blob);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(10, ("get_acl_blob returned %s\n", nt_errstr(status)));
		return status;
	}

	status = parse_acl_blob(&blob, security_info, ppdesc);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(10, ("parse_acl_blob returned %s\n",
				nt_errstr(status)));
		return status;
	}

	TALLOC_FREE(blob.data);
	return status;
}

/*********************************************************************
 Create a default security descriptor for a file in case no inheritance
 exists. All permissions to the owner and SYSTEM.
*********************************************************************/

static struct security_descriptor *default_file_sd(TALLOC_CTX *mem_ctx,
						SMB_STRUCT_STAT *psbuf)
{
	struct dom_sid owner_sid, group_sid;
	size_t sd_size;
	struct security_ace *pace = NULL;
	struct security_acl *pacl = NULL;

	uid_to_sid(&owner_sid, psbuf->st_uid);
	gid_to_sid(&group_sid, psbuf->st_gid);

	pace = TALLOC_ARRAY(mem_ctx, struct security_ace, 2);
	if (!pace) {
		return NULL;
	}

	init_sec_ace(&pace[0], &owner_sid, SEC_ACE_TYPE_ACCESS_ALLOWED,
			SEC_RIGHTS_FILE_ALL, 0);
	init_sec_ace(&pace[1], &global_sid_System, SEC_ACE_TYPE_ACCESS_ALLOWED,
			SEC_RIGHTS_FILE_ALL, 0);

	pacl = make_sec_acl(mem_ctx,
				NT4_ACL_REVISION,
				2,
				pace);
	if (!pacl) {
		return NULL;
	}
	return make_sec_desc(mem_ctx,
			SECURITY_DESCRIPTOR_REVISION_1,
			SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
			&owner_sid,
			&group_sid,
			NULL,
                        pacl,
			&sd_size);
}

/*********************************************************************
*********************************************************************/

static NTSTATUS inherit_new_acl(vfs_handle_struct *handle,
					const char *fname,
					files_struct *fsp,
					bool container)
{
	TALLOC_CTX *ctx = talloc_tos();
	NTSTATUS status;
	struct security_descriptor *parent_desc = NULL;
	struct security_descriptor *psd = NULL;
	DATA_BLOB blob;
	size_t size;
	char *parent_name;

	if (!parent_dirname(ctx, fname, &parent_name, NULL)) {
		return NT_STATUS_NO_MEMORY;
	}

	DEBUG(10,("inherit_new_acl: check directory %s\n",
			parent_name));

	status = get_nt_acl_xattr_internal(handle,
					NULL,
					parent_name,
					(OWNER_SECURITY_INFORMATION |
					 GROUP_SECURITY_INFORMATION |
					 DACL_SECURITY_INFORMATION),
					&parent_desc);
        if (NT_STATUS_IS_OK(status)) {
		/* Create an inherited descriptor from the parent. */

		if (DEBUGLEVEL >= 10) {
			DEBUG(10,("inherit_new_acl: parent acl is:\n"));
			NDR_PRINT_DEBUG(security_descriptor, parent_desc);
		}

		status = se_create_child_secdesc(ctx,
				&psd,
				&size,
				parent_desc,
				&handle->conn->server_info->ptok->user_sids[PRIMARY_USER_SID_INDEX],
				&handle->conn->server_info->ptok->user_sids[PRIMARY_GROUP_SID_INDEX],
				container);
		if (!NT_STATUS_IS_OK(status)) {
			return status;
		}

		if (DEBUGLEVEL >= 10) {
			DEBUG(10,("inherit_new_acl: child acl is:\n"));
			NDR_PRINT_DEBUG(security_descriptor, psd);
		}

	} else {
		DEBUG(10,("inherit_new_acl: directory %s failed "
			"to get acl %s\n",
			parent_name,
			nt_errstr(status) ));
	}

	if (!psd || psd->dacl == NULL) {
		SMB_STRUCT_STAT sbuf;
		int ret;

		TALLOC_FREE(psd);
		if (fsp && !fsp->is_directory && fsp->fh->fd != -1) {
			ret = SMB_VFS_FSTAT(fsp, &sbuf);
		} else {
			if (fsp && fsp->posix_open) {
				ret = SMB_VFS_LSTAT(handle->conn,fname, &sbuf);
			} else {
				ret = SMB_VFS_STAT(handle->conn,fname, &sbuf);
			}
		}
		if (ret == -1) {
			return map_nt_error_from_unix(errno);
		}
		psd = default_file_sd(ctx, &sbuf);
		if (!psd) {
			return NT_STATUS_NO_MEMORY;
		}

		if (DEBUGLEVEL >= 10) {
			DEBUG(10,("inherit_new_acl: default acl is:\n"));
			NDR_PRINT_DEBUG(security_descriptor, psd);
		}
	}

	status = create_acl_blob(psd, &blob);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}
	if (fsp) {
		return store_acl_blob_fsp(handle, fsp, &blob);
	} else {
		return store_acl_blob_pathname(handle, fname, &blob);
	}
}

/*********************************************************************
 Check ACL on open. For new files inherit from parent directory.
*********************************************************************/

static int open_acl_xattr(vfs_handle_struct *handle,
					const char *fname,
					files_struct *fsp,
					int flags,
					mode_t mode)
{
	uint32_t access_granted = 0;
	struct security_descriptor *pdesc = NULL;
	bool file_existed = true;
	NTSTATUS status = get_nt_acl_xattr_internal(handle,
					NULL,
					fname,
					(OWNER_SECURITY_INFORMATION |
					 GROUP_SECURITY_INFORMATION |
					 DACL_SECURITY_INFORMATION),
					&pdesc);
        if (NT_STATUS_IS_OK(status)) {
		/* See if we can access it. */
		status = smb1_file_se_access_check(pdesc,
					handle->conn->server_info->ptok,
					fsp->access_mask,
					&access_granted);
		if (!NT_STATUS_IS_OK(status)) {
			DEBUG(10,("open_acl_xattr: file %s open "
				"refused with error %s\n",
				fname,
				nt_errstr(status) ));
			errno = map_errno_from_nt_status(status);
			return -1;
		}
        } else if (NT_STATUS_EQUAL(status,NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
		file_existed = false;
	}

	DEBUG(10,("open_acl_xattr: get_nt_acl_attr_internal for "
		"file %s returned %s\n",
		fname,
		nt_errstr(status) ));

	fsp->fh->fd = SMB_VFS_NEXT_OPEN(handle, fname, fsp, flags, mode);

	if (!file_existed && fsp->fh->fd != -1) {
		/* File was created. Inherit from parent directory. */
		string_set(&fsp->fsp_name, fname);
		inherit_new_acl(handle, fname, fsp, false);
	}

	return fsp->fh->fd;
}

static int mkdir_acl_xattr(vfs_handle_struct *handle, const char *path, mode_t mode)
{
	int ret = SMB_VFS_NEXT_MKDIR(handle, path, mode);

	if (ret == -1) {
		return ret;
	}
	/* New directory - inherit from parent. */
	inherit_new_acl(handle, path, NULL, true);
	return ret;
}

/*********************************************************************
 Fetch a security descriptor given an fsp.
*********************************************************************/

static NTSTATUS fget_nt_acl_xattr(vfs_handle_struct *handle, files_struct *fsp,
        uint32 security_info, struct security_descriptor **ppdesc)
{
	NTSTATUS status = get_nt_acl_xattr_internal(handle, fsp,
				NULL, security_info, ppdesc);
	if (NT_STATUS_IS_OK(status)) {
		if (DEBUGLEVEL >= 10) {
			DEBUG(10,("fget_nt_acl_xattr: returning xattr sd for file %s\n",
				fsp->fsp_name));
			NDR_PRINT_DEBUG(security_descriptor, *ppdesc);
		}
		return NT_STATUS_OK;
	}

	DEBUG(10,("fget_nt_acl_xattr: failed to get xattr sd for file %s, Error %s\n",
			fsp->fsp_name,
			nt_errstr(status) ));

	return SMB_VFS_NEXT_FGET_NT_ACL(handle, fsp,
			security_info, ppdesc);
}

/*********************************************************************
 Fetch a security descriptor given a pathname.
*********************************************************************/

static NTSTATUS get_nt_acl_xattr(vfs_handle_struct *handle,
        const char *name, uint32 security_info, struct security_descriptor **ppdesc)
{
	NTSTATUS status = get_nt_acl_xattr_internal(handle, NULL,
				name, security_info, ppdesc);
	if (NT_STATUS_IS_OK(status)) {
		if (DEBUGLEVEL >= 10) {
			DEBUG(10,("get_nt_acl_xattr: returning xattr sd for file %s\n",
				name));
			NDR_PRINT_DEBUG(security_descriptor, *ppdesc);
		}
		return NT_STATUS_OK;
	}

	DEBUG(10,("get_nt_acl_xattr: failed to get xattr sd for file %s, Error %s\n",
			name,
			nt_errstr(status) ));

	return SMB_VFS_NEXT_GET_NT_ACL(handle, name,
			security_info, ppdesc);
}

/*********************************************************************
 Store a security descriptor given an fsp.
*********************************************************************/

static NTSTATUS fset_nt_acl_xattr(vfs_handle_struct *handle, files_struct *fsp,
        uint32 security_info_sent, const struct security_descriptor *psd)
{
	NTSTATUS status;
	DATA_BLOB blob;

	if (DEBUGLEVEL >= 10) {
		DEBUG(10,("fset_nt_acl_xattr: incoming sd for file %s\n",
			fsp->fsp_name));
		NDR_PRINT_DEBUG(security_descriptor,
			CONST_DISCARD(struct security_descriptor *,psd));
	}

	status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}

	/* Ensure owner and group are set. */
	if (!psd->owner_sid || !psd->group_sid) {
		int ret;
		SMB_STRUCT_STAT sbuf;
		DOM_SID owner_sid, group_sid;
		struct security_descriptor *nc_psd = dup_sec_desc(talloc_tos(), psd);

		if (!nc_psd) {
			return NT_STATUS_OK;
		}
		if (fsp->is_directory || fsp->fh->fd == -1) {
			if (fsp->posix_open) {
				ret = SMB_VFS_LSTAT(fsp->conn,fsp->fsp_name, &sbuf);
			} else {
				ret = SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf);
			}
		} else {
			ret = SMB_VFS_FSTAT(fsp, &sbuf);
		}
		if (ret == -1) {
			/* Lower level acl set succeeded,
			 * so still return OK. */
			return NT_STATUS_OK;
		}
		create_file_sids(&sbuf, &owner_sid, &group_sid);
		/* This is safe as nc_psd is discarded at fn exit. */
		nc_psd->owner_sid = &owner_sid;
		nc_psd->group_sid = &group_sid;
		security_info_sent |= (OWNER_SECURITY_INFORMATION|GROUP_SECURITY_INFORMATION);
		psd = nc_psd;
	}

#if 0
	if ((security_info_sent & DACL_SECURITY_INFORMATION) &&
			psd->dacl != NULL &&
			(psd->type & (SE_DESC_DACL_AUTO_INHERITED|
				SE_DESC_DACL_AUTO_INHERIT_REQ))==
				(SE_DESC_DACL_AUTO_INHERITED|
				SE_DESC_DACL_AUTO_INHERIT_REQ) ) {
		struct security_descriptor *new_psd = NULL;
		status = append_parent_acl(fsp, psd, &new_psd);
		if (!NT_STATUS_IS_OK(status)) {
			/* Lower level acl set succeeded,
			 * so still return OK. */
			return NT_STATUS_OK;
		}
		psd = new_psd;
	}
#endif

	if (DEBUGLEVEL >= 10) {
		DEBUG(10,("fset_nt_acl_xattr: storing xattr sd for file %s\n",
			fsp->fsp_name));
		NDR_PRINT_DEBUG(security_descriptor,
			CONST_DISCARD(struct security_descriptor *,psd));
	}
	create_acl_blob(psd, &blob);
	store_acl_blob_fsp(handle, fsp, &blob);

	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;
}

/* VFS operations structure */

static vfs_op_tuple skel_op_tuples[] =
{
	{SMB_VFS_OP(mkdir_acl_xattr), SMB_VFS_OP_MKDIR, SMB_VFS_LAYER_TRANSPARENT},
	{SMB_VFS_OP(open_acl_xattr),  SMB_VFS_OP_OPEN,  SMB_VFS_LAYER_TRANSPARENT},

        /* NT File ACL operations */

	{SMB_VFS_OP(fget_nt_acl_xattr),SMB_VFS_OP_FGET_NT_ACL,SMB_VFS_LAYER_TRANSPARENT},
	{SMB_VFS_OP(get_nt_acl_xattr), SMB_VFS_OP_GET_NT_ACL, SMB_VFS_LAYER_TRANSPARENT},
	{SMB_VFS_OP(fset_nt_acl_xattr),SMB_VFS_OP_FSET_NT_ACL,SMB_VFS_LAYER_TRANSPARENT},

	/* POSIX ACL operations. */
	{SMB_VFS_OP(sys_acl_set_file_xattr), SMB_VFS_OP_SYS_ACL_SET_FILE, SMB_VFS_LAYER_TRANSPARENT},
	{SMB_VFS_OP(sys_acl_set_fd_xattr), SMB_VFS_OP_SYS_ACL_SET_FD, SMB_VFS_LAYER_TRANSPARENT},

	{SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP, SMB_VFS_LAYER_NOOP}
};

NTSTATUS vfs_acl_xattr_init(void)
{
	return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_xattr", skel_op_tuples);
}

1 by Chuck Short Initial version	1	/*
	2	* Store Windows ACLs in xattrs.
	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
	27	#undef DBGC_CLASS
	28	#define DBGC_CLASS DBGC_VFS
	29
	30	/*******************************************************************
	31	Parse out a struct security_descriptor from a DATA_BLOB.
	32	*******************************************************************/
	33
	34	static NTSTATUS parse_acl_blob(const DATA_BLOB *pblob,
	35	uint32 security_info,
	36	struct security_descriptor **ppdesc)
	37	{
	38	TALLOC_CTX *ctx = talloc_tos();
	39	struct xattr_NTACL xacl;
	40	enum ndr_err_code ndr_err;
	41	size_t sd_size;
	42
	43	ndr_err = ndr_pull_struct_blob(pblob, ctx, NULL, &xacl,
	44	(ndr_pull_flags_fn_t)ndr_pull_xattr_NTACL);
	45
	46	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
	47	DEBUG(5, ("parse_acl_blob: ndr_pull_xattr_NTACL failed: %s\n",
	48	ndr_errstr(ndr_err)));
	49	return ndr_map_error2ntstatus(ndr_err);;
	50	}
	51
	52	if (xacl.version != 2) {
	53	return NT_STATUS_REVISION_MISMATCH;
	54	}
	55
	56	*ppdesc = make_sec_desc(ctx, SEC_DESC_REVISION, xacl.info.sd_hs->sd->type \| SEC_DESC_SELF_RELATIVE,
	57	(security_info & OWNER_SECURITY_INFORMATION)
	58	? xacl.info.sd_hs->sd->owner_sid : NULL,
	59	(security_info & GROUP_SECURITY_INFORMATION)
	60	? xacl.info.sd_hs->sd->group_sid : NULL,
	61	(security_info & SACL_SECURITY_INFORMATION)
	62	? xacl.info.sd_hs->sd->sacl : NULL,
	63	(security_info & DACL_SECURITY_INFORMATION)
	64	? xacl.info.sd_hs->sd->dacl : NULL,
65	&sd_size);
66
67	TALLOC_FREE(xacl.info.sd);
68
69	return (*ppdesc != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
70	}
71
72	/*******************************************************************
73	Pull a security descriptor into a DATA_BLOB from a xattr.
74	*******************************************************************/
75
76	static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
77	vfs_handle_struct *handle,
78	files_struct *fsp,
79	const char *name,
80	DATA_BLOB *pblob)
81	{
82	size_t size = 1024;
83	uint8_t *val = NULL;
84	uint8_t *tmp;
85	ssize_t sizeret;
86	int saved_errno = 0;
87
88	ZERO_STRUCTP(pblob);
89
90	again:
91
92	tmp = TALLOC_REALLOC_ARRAY(ctx, val, uint8_t, size);
93	if (tmp == NULL) {
94	TALLOC_FREE(val);
95	return NT_STATUS_NO_MEMORY;
96	}
97	val = tmp;
98
99	become_root();
100	if (fsp && fsp->fh->fd != -1) {
101	sizeret = SMB_VFS_FGETXATTR(fsp, XATTR_NTACL_NAME, val, size);
102	} else {
103	sizeret = SMB_VFS_GETXATTR(handle->conn, name,
104	XATTR_NTACL_NAME, val, size);
105	}
106	if (sizeret == -1) {
107	saved_errno = errno;
108	}
109	unbecome_root();
110
111	/* Max ACL size is 65536 bytes. */
112	if (sizeret == -1) {
113	errno = saved_errno;
114	if ((errno == ERANGE) && (size != 65536)) {
115	/* Too small, try again. */
116	size = 65536;
117	goto again;
118	}
119
120	/* Real error - exit here. */
121	TALLOC_FREE(val);
122	return map_nt_error_from_unix(errno);
123	}
124
125	pblob->data = val;
126	pblob->length = sizeret;
127	return NT_STATUS_OK;
128	}
129
130	/*******************************************************************
131	Create a DATA_BLOB from a security descriptor.
132	*******************************************************************/
133
134	static NTSTATUS create_acl_blob(const struct security_descriptor psd, DATA_BLOB pblob)
135	{
136	struct xattr_NTACL xacl;
137	struct security_descriptor_hash sd_hs;
138	enum ndr_err_code ndr_err;
139	TALLOC_CTX *ctx = talloc_tos();
140
141	ZERO_STRUCT(xacl);
142	ZERO_STRUCT(sd_hs);
143
144	xacl.version = 2;
145	xacl.info.sd_hs = &sd_hs;
146	xacl.info.sd_hs->sd = CONST_DISCARD(struct security_descriptor *, psd);
147	memset(&xacl.info.sd_hs->hash[0], '\0', 16);
148
149	ndr_err = ndr_push_struct_blob(
150	pblob, ctx, NULL, &xacl,
151	(ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
152
153	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
154	DEBUG(5, ("create_acl_blob: ndr_push_xattr_NTACL failed: %s\n",
155	ndr_errstr(ndr_err)));
156	return ndr_map_error2ntstatus(ndr_err);;
157	}
158
159	return NT_STATUS_OK;
160	}
161
162	/*******************************************************************
163	Store a DATA_BLOB into an xattr given an fsp pointer.
164	*******************************************************************/
165
166	static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
167	files_struct *fsp,
168	DATA_BLOB *pblob)
169	{
170	int ret;
171	int saved_errno = 0;
172
173	DEBUG(10,("store_acl_blob_fsp: storing blob length %u on file %s\n",
174	(unsigned int)pblob->length, fsp->fsp_name));
175
176	become_root();
177	if (fsp->fh->fd != -1) {
178	ret = SMB_VFS_FSETXATTR(fsp, XATTR_NTACL_NAME,
179	pblob->data, pblob->length, 0);
180	} else {
181	ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name,
182	XATTR_NTACL_NAME,
183	pblob->data, pblob->length, 0);
184	}
185	if (ret) {
186	saved_errno = errno;
187	}
188	unbecome_root();
189	if (ret) {
190	errno = saved_errno;
191	DEBUG(5, ("store_acl_blob_fsp: setting attr failed for file %s"
192	"with error %s\n",
193	fsp->fsp_name,
194	strerror(errno) ));
195	return map_nt_error_from_unix(errno);
196	}
197	return NT_STATUS_OK;
198	}
199
200	/*******************************************************************
201	Store a DATA_BLOB into an xattr given a pathname.
202	*******************************************************************/
203
204	static NTSTATUS store_acl_blob_pathname(vfs_handle_struct *handle,
205	const char *fname,
206	DATA_BLOB *pblob)
207	{
208	connection_struct *conn = handle->conn;
209	int ret;
210	int saved_errno = 0;
211
212	DEBUG(10,("store_acl_blob_pathname: storing blob "
213	"length %u on file %s\n",
214	(unsigned int)pblob->length, fname));
215
216	become_root();
217	ret = SMB_VFS_SETXATTR(conn, fname,
218	XATTR_NTACL_NAME,
219	pblob->data, pblob->length, 0);
220	if (ret) {
221	saved_errno = errno;
222	}
223	unbecome_root();
224	if (ret) {
225	errno = saved_errno;
226	DEBUG(5, ("store_acl_blob_pathname: setting attr failed "
227	"for file %s with error %s\n",
228	fname,
229	strerror(errno) ));
230	return map_nt_error_from_unix(errno);
231	}
232	return NT_STATUS_OK;
233	}
234
235	/*******************************************************************
236	Store a DATA_BLOB into an xattr given a pathname.
237	*******************************************************************/
238
239	static NTSTATUS get_nt_acl_xattr_internal(vfs_handle_struct *handle,
240	files_struct *fsp,
241	const char *name,
242	uint32 security_info,
243	struct security_descriptor **ppdesc)
244	{
245	TALLOC_CTX *ctx = talloc_tos();
246	DATA_BLOB blob;
247	NTSTATUS status;
248
249	if (fsp && name == NULL) {
250	name = fsp->fsp_name;
251	}
252
253	DEBUG(10, ("get_nt_acl_xattr_internal: name=%s\n", name));
254
255	status = get_acl_blob(ctx, handle, fsp, name, &blob);
256	if (!NT_STATUS_IS_OK(status)) {
257	DEBUG(10, ("get_acl_blob returned %s\n", nt_errstr(status)));
258	return status;
259	}
260
261	status = parse_acl_blob(&blob, security_info, ppdesc);
262	if (!NT_STATUS_IS_OK(status)) {
263	DEBUG(10, ("parse_acl_blob returned %s\n",
264	nt_errstr(status)));
265	return status;
266	}
267
268	TALLOC_FREE(blob.data);
269	return status;
270	}
271
272	/*********************************************************************
273	Create a default security descriptor for a file in case no inheritance
274	exists. All permissions to the owner and SYSTEM.
275	*********************************************************************/
276
277	static struct security_descriptor default_file_sd(TALLOC_CTX mem_ctx,
278	SMB_STRUCT_STAT *psbuf)
279	{
280	struct dom_sid owner_sid, group_sid;
281	size_t sd_size;
282	struct security_ace *pace = NULL;
283	struct security_acl *pacl = NULL;
284
285	uid_to_sid(&owner_sid, psbuf->st_uid);
286	gid_to_sid(&group_sid, psbuf->st_gid);
287
288	pace = TALLOC_ARRAY(mem_ctx, struct security_ace, 2);
289	if (!pace) {
290	return NULL;
291	}
292
293	init_sec_ace(&pace[0], &owner_sid, SEC_ACE_TYPE_ACCESS_ALLOWED,
294	SEC_RIGHTS_FILE_ALL, 0);
295	init_sec_ace(&pace[1], &global_sid_System, SEC_ACE_TYPE_ACCESS_ALLOWED,
296	SEC_RIGHTS_FILE_ALL, 0);
297
298	pacl = make_sec_acl(mem_ctx,
299	NT4_ACL_REVISION,
300	2,
301	pace);
302	if (!pacl) {
303	return NULL;
304	}
305	return make_sec_desc(mem_ctx,
306	SECURITY_DESCRIPTOR_REVISION_1,
307	SEC_DESC_SELF_RELATIVE\|SEC_DESC_DACL_PRESENT,
308	&owner_sid,
309	&group_sid,
310	NULL,
311	pacl,
312	&sd_size);
313	}
314
315	/*********************************************************************
316	*********************************************************************/
317
318	static NTSTATUS inherit_new_acl(vfs_handle_struct *handle,
319	const char *fname,
320	files_struct *fsp,
321	bool container)
322	{
323	TALLOC_CTX *ctx = talloc_tos();
324	NTSTATUS status;
325	struct security_descriptor *parent_desc = NULL;
326	struct security_descriptor *psd = NULL;
327	DATA_BLOB blob;
328	size_t size;
329	char *parent_name;
330
331	if (!parent_dirname(ctx, fname, &parent_name, NULL)) {
332	return NT_STATUS_NO_MEMORY;
333	}
334
335	DEBUG(10,("inherit_new_acl: check directory %s\n",
336	parent_name));
337
338	status = get_nt_acl_xattr_internal(handle,
339	NULL,
340	parent_name,
341	(OWNER_SECURITY_INFORMATION \|
342	GROUP_SECURITY_INFORMATION \|
343	DACL_SECURITY_INFORMATION),
344	&parent_desc);
345	if (NT_STATUS_IS_OK(status)) {
346	/* Create an inherited descriptor from the parent. */
347
348	if (DEBUGLEVEL >= 10) {
349	DEBUG(10,("inherit_new_acl: parent acl is:\n"));
350	NDR_PRINT_DEBUG(security_descriptor, parent_desc);
351	}
352
353	status = se_create_child_secdesc(ctx,
354	&psd,
355	&size,
356	parent_desc,
357	&handle->conn->server_info->ptok->user_sids[PRIMARY_USER_SID_INDEX],
358	&handle->conn->server_info->ptok->user_sids[PRIMARY_GROUP_SID_INDEX],
359	container);
360	if (!NT_STATUS_IS_OK(status)) {
361	return status;
362	}
363
364	if (DEBUGLEVEL >= 10) {
365	DEBUG(10,("inherit_new_acl: child acl is:\n"));
366	NDR_PRINT_DEBUG(security_descriptor, psd);
367	}
368
369	} else {
370	DEBUG(10,("inherit_new_acl: directory %s failed "
371	"to get acl %s\n",
372	parent_name,
373	nt_errstr(status) ));
374	}
375
376	if (!psd \|\| psd->dacl == NULL) {
377	SMB_STRUCT_STAT sbuf;
378	int ret;
379
380	TALLOC_FREE(psd);
381	if (fsp && !fsp->is_directory && fsp->fh->fd != -1) {
382	ret = SMB_VFS_FSTAT(fsp, &sbuf);
383	} else {
384	if (fsp && fsp->posix_open) {
385	ret = SMB_VFS_LSTAT(handle->conn,fname, &sbuf);
386	} else {
387	ret = SMB_VFS_STAT(handle->conn,fname, &sbuf);
388	}
389	}
390	if (ret == -1) {
391	return map_nt_error_from_unix(errno);
392	}
393	psd = default_file_sd(ctx, &sbuf);
394	if (!psd) {
395	return NT_STATUS_NO_MEMORY;
396	}
397
398	if (DEBUGLEVEL >= 10) {
399	DEBUG(10,("inherit_new_acl: default acl is:\n"));
400	NDR_PRINT_DEBUG(security_descriptor, psd);
401	}
402	}
403
404	status = create_acl_blob(psd, &blob);
405	if (!NT_STATUS_IS_OK(status)) {
406	return status;
407	}
408	if (fsp) {
409	return store_acl_blob_fsp(handle, fsp, &blob);
410	} else {
411	return store_acl_blob_pathname(handle, fname, &blob);
412	}
413	}
414
415	/*********************************************************************
416	Check ACL on open. For new files inherit from parent directory.
417	*********************************************************************/
418
419	static int open_acl_xattr(vfs_handle_struct *handle,
420	const char *fname,
421	files_struct *fsp,
422	int flags,
423	mode_t mode)
424	{
425	uint32_t access_granted = 0;
426	struct security_descriptor *pdesc = NULL;
427	bool file_existed = true;
428	NTSTATUS status = get_nt_acl_xattr_internal(handle,
429	NULL,
430	fname,
431	(OWNER_SECURITY_INFORMATION \|
432	GROUP_SECURITY_INFORMATION \|
433	DACL_SECURITY_INFORMATION),
434	&pdesc);
435	if (NT_STATUS_IS_OK(status)) {
436	/* See if we can access it. */
437	status = smb1_file_se_access_check(pdesc,
438	handle->conn->server_info->ptok,
439	fsp->access_mask,
440	&access_granted);
441	if (!NT_STATUS_IS_OK(status)) {
442	DEBUG(10,("open_acl_xattr: file %s open "
443	"refused with error %s\n",
444	fname,
445	nt_errstr(status) ));
446	errno = map_errno_from_nt_status(status);
447	return -1;
448	}
449	} else if (NT_STATUS_EQUAL(status,NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
450	file_existed = false;
451	}
452
453	DEBUG(10,("open_acl_xattr: get_nt_acl_attr_internal for "
454	"file %s returned %s\n",
455	fname,
456	nt_errstr(status) ));
457
458	fsp->fh->fd = SMB_VFS_NEXT_OPEN(handle, fname, fsp, flags, mode);
459
460	if (!file_existed && fsp->fh->fd != -1) {
461	/* File was created. Inherit from parent directory. */
462	string_set(&fsp->fsp_name, fname);
463	inherit_new_acl(handle, fname, fsp, false);
464	}
465
466	return fsp->fh->fd;
467	}
468
469	static int mkdir_acl_xattr(vfs_handle_struct handle, const char path, mode_t mode)
470	{
471	int ret = SMB_VFS_NEXT_MKDIR(handle, path, mode);
472
473	if (ret == -1) {
474	return ret;
475	}
476	/* New directory - inherit from parent. */
477	inherit_new_acl(handle, path, NULL, true);
478	return ret;
479	}
480
481	/*********************************************************************
482	Fetch a security descriptor given an fsp.
483	*********************************************************************/
484
485	static NTSTATUS fget_nt_acl_xattr(vfs_handle_struct handle, files_struct fsp,
486	uint32 security_info, struct security_descriptor **ppdesc)
487	{
488	NTSTATUS status = get_nt_acl_xattr_internal(handle, fsp,
489	NULL, security_info, ppdesc);
490	if (NT_STATUS_IS_OK(status)) {
491	if (DEBUGLEVEL >= 10) {
492	DEBUG(10,("fget_nt_acl_xattr: returning xattr sd for file %s\n",
493	fsp->fsp_name));
494	NDR_PRINT_DEBUG(security_descriptor, *ppdesc);
495	}
496	return NT_STATUS_OK;
497	}
498
499	DEBUG(10,("fget_nt_acl_xattr: failed to get xattr sd for file %s, Error %s\n",
500	fsp->fsp_name,
501	nt_errstr(status) ));
502
503	return SMB_VFS_NEXT_FGET_NT_ACL(handle, fsp,
504	security_info, ppdesc);
505	}
506
507	/*********************************************************************
508	Fetch a security descriptor given a pathname.
509	*********************************************************************/
510
511	static NTSTATUS get_nt_acl_xattr(vfs_handle_struct *handle,
512	const char name, uint32 security_info, struct security_descriptor *ppdesc)
513	{
514	NTSTATUS status = get_nt_acl_xattr_internal(handle, NULL,
515	name, security_info, ppdesc);
516	if (NT_STATUS_IS_OK(status)) {
517	if (DEBUGLEVEL >= 10) {
518	DEBUG(10,("get_nt_acl_xattr: returning xattr sd for file %s\n",
519	name));
520	NDR_PRINT_DEBUG(security_descriptor, *ppdesc);
521	}
522	return NT_STATUS_OK;
523	}
524
525	DEBUG(10,("get_nt_acl_xattr: failed to get xattr sd for file %s, Error %s\n",
526	name,
527	nt_errstr(status) ));
528
529	return SMB_VFS_NEXT_GET_NT_ACL(handle, name,
530	security_info, ppdesc);
531	}
532
533	/*********************************************************************
534	Store a security descriptor given an fsp.
535	*********************************************************************/
536
537	static NTSTATUS fset_nt_acl_xattr(vfs_handle_struct handle, files_struct fsp,
538	uint32 security_info_sent, const struct security_descriptor *psd)
539	{
540	NTSTATUS status;
541	DATA_BLOB blob;
542
543	if (DEBUGLEVEL >= 10) {
544	DEBUG(10,("fset_nt_acl_xattr: incoming sd for file %s\n",
545	fsp->fsp_name));
546	NDR_PRINT_DEBUG(security_descriptor,
547	CONST_DISCARD(struct security_descriptor *,psd));
548	}
549
550	status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
551	if (!NT_STATUS_IS_OK(status)) {
552	return status;
553	}
554
555	/* Ensure owner and group are set. */
556	if (!psd->owner_sid \|\| !psd->group_sid) {
557	int ret;
558	SMB_STRUCT_STAT sbuf;
559	DOM_SID owner_sid, group_sid;
560	struct security_descriptor *nc_psd = dup_sec_desc(talloc_tos(), psd);
561
562	if (!nc_psd) {
563	return NT_STATUS_OK;
564	}
565	if (fsp->is_directory \|\| fsp->fh->fd == -1) {
566	if (fsp->posix_open) {
567	ret = SMB_VFS_LSTAT(fsp->conn,fsp->fsp_name, &sbuf);
568	} else {
569	ret = SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf);
570	}
571	} else {
572	ret = SMB_VFS_FSTAT(fsp, &sbuf);
573	}
574	if (ret == -1) {
575	/* Lower level acl set succeeded,
576	* so still return OK. */
577	return NT_STATUS_OK;
578	}
579	create_file_sids(&sbuf, &owner_sid, &group_sid);
580	/* This is safe as nc_psd is discarded at fn exit. */
581	nc_psd->owner_sid = &owner_sid;
582	nc_psd->group_sid = &group_sid;
583	security_info_sent \|= (OWNER_SECURITY_INFORMATION\|GROUP_SECURITY_INFORMATION);
584	psd = nc_psd;
585	}
586
587	#if 0
588	if ((security_info_sent & DACL_SECURITY_INFORMATION) &&
589	psd->dacl != NULL &&
590	(psd->type & (SE_DESC_DACL_AUTO_INHERITED\|
591	SE_DESC_DACL_AUTO_INHERIT_REQ))==
592	(SE_DESC_DACL_AUTO_INHERITED\|
593	SE_DESC_DACL_AUTO_INHERIT_REQ) ) {
594	struct security_descriptor *new_psd = NULL;
595	status = append_parent_acl(fsp, psd, &new_psd);
596	if (!NT_STATUS_IS_OK(status)) {
597	/* Lower level acl set succeeded,
598	* so still return OK. */
599	return NT_STATUS_OK;
600	}
601	psd = new_psd;
602	}
603	#endif
604
605	if (DEBUGLEVEL >= 10) {
606	DEBUG(10,("fset_nt_acl_xattr: storing xattr sd for file %s\n",
607	fsp->fsp_name));
608	NDR_PRINT_DEBUG(security_descriptor,
609	CONST_DISCARD(struct security_descriptor *,psd));
610	}
611	create_acl_blob(psd, &blob);
612	store_acl_blob_fsp(handle, fsp, &blob);
613
614	return NT_STATUS_OK;
615	}
616
617	/*********************************************************************
618	Remove a Windows ACL - we're setting the underlying POSIX ACL.
619	*********************************************************************/
620
621	static int sys_acl_set_file_xattr(vfs_handle_struct *handle,
622	const char *name,
623	SMB_ACL_TYPE_T type,
624	SMB_ACL_T theacl)
625	{
626	int ret = SMB_VFS_NEXT_SYS_ACL_SET_FILE(handle,
627	name,
628	type,
629	theacl);
630	if (ret == -1) {
631	return -1;
632	}
633
634	become_root();
635	SMB_VFS_REMOVEXATTR(handle->conn, name, XATTR_NTACL_NAME);
636	unbecome_root();
637
638	return ret;
639	}
640
641	/*********************************************************************
642	Remove a Windows ACL - we're setting the underlying POSIX ACL.
643	*********************************************************************/
644
645	static int sys_acl_set_fd_xattr(vfs_handle_struct *handle,
646	files_struct *fsp,
647	SMB_ACL_T theacl)
648	{
649	int ret = SMB_VFS_NEXT_SYS_ACL_SET_FD(handle,
650	fsp,
651	theacl);
652	if (ret == -1) {
653	return -1;
654	}
655
656	become_root();
657	SMB_VFS_FREMOVEXATTR(fsp, XATTR_NTACL_NAME);
658	unbecome_root();
659
660	return ret;
661	}
662
663	/* VFS operations structure */
664
665	static vfs_op_tuple skel_op_tuples[] =
666	{
667	{SMB_VFS_OP(mkdir_acl_xattr), SMB_VFS_OP_MKDIR, SMB_VFS_LAYER_TRANSPARENT},
668	{SMB_VFS_OP(open_acl_xattr), SMB_VFS_OP_OPEN, SMB_VFS_LAYER_TRANSPARENT},
669
670	/* NT File ACL operations */
671
672	{SMB_VFS_OP(fget_nt_acl_xattr),SMB_VFS_OP_FGET_NT_ACL,SMB_VFS_LAYER_TRANSPARENT},
673	{SMB_VFS_OP(get_nt_acl_xattr), SMB_VFS_OP_GET_NT_ACL, SMB_VFS_LAYER_TRANSPARENT},
674	{SMB_VFS_OP(fset_nt_acl_xattr),SMB_VFS_OP_FSET_NT_ACL,SMB_VFS_LAYER_TRANSPARENT},
675
676	/* POSIX ACL operations. */
677	{SMB_VFS_OP(sys_acl_set_file_xattr), SMB_VFS_OP_SYS_ACL_SET_FILE, SMB_VFS_LAYER_TRANSPARENT},
678	{SMB_VFS_OP(sys_acl_set_fd_xattr), SMB_VFS_OP_SYS_ACL_SET_FD, SMB_VFS_LAYER_TRANSPARENT},
679
680	{SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP, SMB_VFS_LAYER_NOOP}
681	};
682
683	NTSTATUS vfs_acl_xattr_init(void)
684	{
685	return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_xattr", skel_op_tuples);
686	}