/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2005 Doug Rabson
 * All rights reserved.
 *
 * 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 <gssapi/gssapi.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>

#include "mech_switch.h"
#include "context.h"
#include "utils.h"

OM_uint32
gss_export_sec_context(OM_uint32 *minor_status,
    gss_ctx_id_t *context_handle,
    gss_buffer_t interprocess_token)
{
        OM_uint32 major_status;
        struct _gss_context *ctx = (struct _gss_context *) *context_handle;
        struct _gss_mech_switch *m = ctx->gc_mech;
        gss_buffer_desc buf;

        _gss_buffer_zero(interprocess_token);

        major_status = m->gm_export_sec_context(minor_status,
            &ctx->gc_ctx, &buf);

        if (major_status == GSS_S_COMPLETE) {
                unsigned char *p;

                free(ctx);
                *context_handle = GSS_C_NO_CONTEXT;
                interprocess_token->length = buf.length
                        + 2 + m->gm_mech_oid.length;
                interprocess_token->value = malloc(interprocess_token->length);
                if (!interprocess_token->value) {
                        /*
                         * We are in trouble here - the context is
                         * already gone. This is allowed as long as we
                         * set the caller's context_handle to
                         * GSS_C_NO_CONTEXT, which we did above.
                         * Return GSS_S_FAILURE.
                         */
                        _gss_buffer_zero(interprocess_token);
                        *minor_status = ENOMEM;
                        return (GSS_S_FAILURE);
                }
                p = interprocess_token->value;
                p[0] = m->gm_mech_oid.length >> 8;
                p[1] = m->gm_mech_oid.length;
                memcpy(p + 2, m->gm_mech_oid.elements, m->gm_mech_oid.length);
                memcpy(p + 2 + m->gm_mech_oid.length, buf.value, buf.length);
                gss_release_buffer(minor_status, &buf);
        } else {
                _gss_mg_error(m, major_status, *minor_status);
        }

        return (major_status);
}