xref: /freebsd-10-stable/sys/kgssapi/gss_unwrap.c

/*-
 * Copyright (c) 2008 Isilon Inc http://www.isilon.com/
 * Authors: Doug Rabson <dfr@rabson.org>
 * Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/kobj.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>

#include <kgssapi/gssapi.h>
#include <kgssapi/gssapi_impl.h>

#include "kgss_if.h"

OM_uint32
gss_unwrap(OM_uint32 *minor_status,
    const gss_ctx_id_t ctx,
    const gss_buffer_t input_message_buffer,
    gss_buffer_t output_message_buffer,
    int *conf_state,
    gss_qop_t *qop_state)
{
	OM_uint32 maj_stat;
	struct mbuf *m;

	if (!ctx) {
		*minor_status = 0;
		return (GSS_S_NO_CONTEXT);
	}

	MGET(m, M_WAITOK, MT_DATA);
	if (input_message_buffer->length > MLEN)
		MCLGET(m, M_WAITOK);
	m_append(m, input_message_buffer->length, input_message_buffer->value);

	maj_stat = KGSS_UNWRAP(ctx, minor_status, &m, conf_state, qop_state);

	/*
	 * On success, m is the wrapped message, on failure, m is
	 * freed.
	 */
	if (maj_stat == GSS_S_COMPLETE) {
		output_message_buffer->length = m_length(m, NULL);
		output_message_buffer->value =
			malloc(output_message_buffer->length,
			    M_GSSAPI, M_WAITOK);
		m_copydata(m, 0, output_message_buffer->length,
		    output_message_buffer->value);
		m_freem(m);
	}

	return (maj_stat);
}

OM_uint32
gss_unwrap_mbuf(OM_uint32 *minor_status,
    const gss_ctx_id_t ctx,
    struct mbuf **mp,
    int *conf_state,
    gss_qop_t *qop_state)
{

	if (!ctx) {
		*minor_status = 0;
		return (GSS_S_NO_CONTEXT);
	}

	return (KGSS_UNWRAP(ctx, minor_status, mp, conf_state, qop_state));
}