HardenedBSD/sys/rpc/rpc_callmsg.c

/*	$NetBSD: rpc_callmsg.c,v 1.16 2000/07/14 08:40:42 fvdl Exp $	*/

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 2009, Sun Microsystems, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 * - Redistributions of source code must retain the above copyright notice, 
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice, 
 *   this list of conditions and the following disclaimer in the documentation 
 *   and/or other materials provided with the distribution.
 * - Neither the name of Sun Microsystems, Inc. nor the names of its 
 *   contributors may be used to endorse or promote products derived 
 *   from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
/*
 * rpc_callmsg.c
 *
 * Copyright (C) 1984, Sun Microsystems, Inc.
 *
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>

#include <rpc/rpc.h>

/*
 * XDR a call message
 */
bool_t
xdr_callmsg(XDR *xdrs, struct rpc_msg *cmsg)
{
	enum msg_type *prm_direction;
	int32_t *buf;
	struct opaque_auth *oa;

	if (xdrs->x_op == XDR_ENCODE) {
		if (cmsg->rm_call.cb_cred.oa_length > MAX_AUTH_BYTES) {
			return (FALSE);
		}
		if (cmsg->rm_call.cb_verf.oa_length > MAX_AUTH_BYTES) {
			return (FALSE);
		}
		buf = XDR_INLINE(xdrs, 8 * BYTES_PER_XDR_UNIT
			+ RNDUP(cmsg->rm_call.cb_cred.oa_length)
			+ 2 * BYTES_PER_XDR_UNIT
			+ RNDUP(cmsg->rm_call.cb_verf.oa_length));
		if (buf != NULL) {
			IXDR_PUT_INT32(buf, cmsg->rm_xid);
			IXDR_PUT_ENUM(buf, cmsg->rm_direction);
			if (cmsg->rm_direction != CALL) {
				return (FALSE);
			}
			IXDR_PUT_INT32(buf, cmsg->rm_call.cb_rpcvers);
			if (cmsg->rm_call.cb_rpcvers != RPC_MSG_VERSION) {
				return (FALSE);
			}
			IXDR_PUT_INT32(buf, cmsg->rm_call.cb_prog);
			IXDR_PUT_INT32(buf, cmsg->rm_call.cb_vers);
			IXDR_PUT_INT32(buf, cmsg->rm_call.cb_proc);
			oa = &cmsg->rm_call.cb_cred;
			IXDR_PUT_ENUM(buf, oa->oa_flavor);
			IXDR_PUT_INT32(buf, oa->oa_length);
			if (oa->oa_length) {
				memcpy(buf, oa->oa_base, oa->oa_length);
				buf += RNDUP(oa->oa_length) / sizeof (int32_t);
			}
			oa = &cmsg->rm_call.cb_verf;
			IXDR_PUT_ENUM(buf, oa->oa_flavor);
			IXDR_PUT_INT32(buf, oa->oa_length);
			if (oa->oa_length) {
				memcpy(buf, oa->oa_base, oa->oa_length);
				/* no real need....
				buf += RNDUP(oa->oa_length) / sizeof (int32_t);
				*/
			}
			return (TRUE);
		}
	}
	if (xdrs->x_op == XDR_DECODE) {
		buf = XDR_INLINE(xdrs, 8 * BYTES_PER_XDR_UNIT);
		if (buf != NULL) {
			cmsg->rm_xid = IXDR_GET_UINT32(buf);
			cmsg->rm_direction = IXDR_GET_ENUM(buf, enum msg_type);
			if (cmsg->rm_direction != CALL) {
				return (FALSE);
			}
			cmsg->rm_call.cb_rpcvers = IXDR_GET_UINT32(buf);
			if (cmsg->rm_call.cb_rpcvers != RPC_MSG_VERSION) {
				return (FALSE);
			}
			cmsg->rm_call.cb_prog = IXDR_GET_UINT32(buf);
			cmsg->rm_call.cb_vers = IXDR_GET_UINT32(buf);
			cmsg->rm_call.cb_proc = IXDR_GET_UINT32(buf);
			oa = &cmsg->rm_call.cb_cred;
			oa->oa_flavor = IXDR_GET_ENUM(buf, enum_t);
			oa->oa_length = (u_int)IXDR_GET_UINT32(buf);
			if (oa->oa_length) {
				if (oa->oa_length > MAX_AUTH_BYTES) {
					return (FALSE);
				}
				if (oa->oa_base == NULL) {
					oa->oa_base = (caddr_t)
					    mem_alloc(oa->oa_length);
					if (oa->oa_base == NULL)
						return (FALSE);
				}
				buf = XDR_INLINE(xdrs, RNDUP(oa->oa_length));
				if (buf == NULL) {
					if (xdr_opaque(xdrs, oa->oa_base,
					    oa->oa_length) == FALSE) {
						return (FALSE);
					}
				} else {
					memcpy(oa->oa_base, buf,
					    oa->oa_length);
					/* no real need....
					buf += RNDUP(oa->oa_length) /
						sizeof (int32_t);
					*/
				}
			}
			oa = &cmsg->rm_call.cb_verf;
			buf = XDR_INLINE(xdrs, 2 * BYTES_PER_XDR_UNIT);
			if (buf == NULL) {
				if (xdr_enum(xdrs, &oa->oa_flavor) == FALSE ||
				    xdr_u_int(xdrs, &oa->oa_length) == FALSE) {
					return (FALSE);
				}
			} else {
				oa->oa_flavor = IXDR_GET_ENUM(buf, enum_t);
				oa->oa_length = (u_int)IXDR_GET_UINT32(buf);
			}
			if (oa->oa_length) {
				if (oa->oa_length > MAX_AUTH_BYTES) {
					return (FALSE);
				}
				if (oa->oa_base == NULL) {
					oa->oa_base = (caddr_t)
					    mem_alloc(oa->oa_length);
					if (oa->oa_base == NULL)
						return (FALSE);
				}
				buf = XDR_INLINE(xdrs, RNDUP(oa->oa_length));
				if (buf == NULL) {
					if (xdr_opaque(xdrs, oa->oa_base,
					    oa->oa_length) == FALSE) {
						return (FALSE);
					}
				} else {
					memcpy(oa->oa_base, buf,
					    oa->oa_length);
					/* no real need...
					buf += RNDUP(oa->oa_length) /
						sizeof (int32_t);
					*/
				}
			}
			return (TRUE);
		}
	}
	prm_direction = &cmsg->rm_direction;
	if (
	    xdr_uint32_t(xdrs, &(cmsg->rm_xid)) &&
	    xdr_enum(xdrs, (enum_t *) prm_direction) &&
	    (cmsg->rm_direction == CALL) &&
	    xdr_uint32_t(xdrs, &(cmsg->rm_call.cb_rpcvers)) &&
	    (cmsg->rm_call.cb_rpcvers == RPC_MSG_VERSION) &&
	    xdr_uint32_t(xdrs, &(cmsg->rm_call.cb_prog)) &&
	    xdr_uint32_t(xdrs, &(cmsg->rm_call.cb_vers)) &&
	    xdr_uint32_t(xdrs, &(cmsg->rm_call.cb_proc)) &&
	    xdr_opaque_auth(xdrs, &(cmsg->rm_call.cb_cred)) )
		return (xdr_opaque_auth(xdrs, &(cmsg->rm_call.cb_verf)));
	return (FALSE);
}