/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
 */

/*
 *  glue routine gss_export_sec_context
 */

#ifndef LEAN_CLIENT

#include <mechglueP.h>
#include "gssapiP_generic.h"
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>

static OM_uint32
val_imp_sec_ctx_args(
        OM_uint32 *minor_status,
        gss_buffer_t interprocess_token,
        gss_ctx_id_t *context_handle)
{

        /* Initialize outputs. */
        if (minor_status != NULL)
                *minor_status = 0;

        if (context_handle != NULL)
                *context_handle = GSS_C_NO_CONTEXT;

        /* Validate arguments. */

        if (minor_status == NULL)
                return (GSS_S_CALL_INACCESSIBLE_WRITE);

        if (context_handle == NULL)
                return (GSS_S_CALL_INACCESSIBLE_WRITE);

        if (interprocess_token == GSS_C_NO_BUFFER)
                return (GSS_S_CALL_INACCESSIBLE_READ | GSS_S_DEFECTIVE_TOKEN);

        if (GSS_EMPTY_BUFFER(interprocess_token))
                return (GSS_S_CALL_INACCESSIBLE_READ | GSS_S_DEFECTIVE_TOKEN);

        return (GSS_S_COMPLETE);
}

OM_uint32
gss_import_sec_context(minor_status,
                        interprocess_token,
                        context_handle)

OM_uint32 *             minor_status;
const gss_buffer_t      interprocess_token;
gss_ctx_id_t            *context_handle;

{
        OM_uint32               length = 0;
        OM_uint32               status;
        char                    *p;
        gss_union_ctx_id_t      ctx;
        gss_buffer_desc         token;
        gss_mechanism           mech;

        status = val_imp_sec_ctx_args(minor_status,
                                interprocess_token, context_handle);
        if (status != GSS_S_COMPLETE)
                return (status);

        /* Initial value needed below. */
        status = GSS_S_FAILURE;

        ctx = (gss_union_ctx_id_t)malloc(sizeof (gss_union_ctx_id_desc));
        if (!ctx)
                return (GSS_S_FAILURE);

        ctx->mech_type = (gss_OID) malloc(sizeof (gss_OID_desc));
        if (!ctx->mech_type) {
                free(ctx);
                return (GSS_S_FAILURE);
        }

        if (interprocess_token->length >= sizeof (OM_uint32)) {
                p = interprocess_token->value;
                length = (OM_uint32)*p++;
                length = (OM_uint32)(length << 8) + *p++;
                length = (OM_uint32)(length << 8) + *p++;
                length = (OM_uint32)(length << 8) + *p++;
        }

        if (length == 0 ||
            length > (interprocess_token->length - sizeof (OM_uint32))) {
                free(ctx);
                return (GSS_S_CALL_BAD_STRUCTURE | GSS_S_DEFECTIVE_TOKEN);
        }

        ctx->mech_type->length = length;
        ctx->mech_type->elements = malloc(length);
        if (!ctx->mech_type->elements) {
                goto error_out;
        }
        (void) memcpy(ctx->mech_type->elements, p, length);
        p += length;

        token.length = interprocess_token->length - sizeof (OM_uint32) - length;
        token.value = p;

        /*
         * select the approprate underlying mechanism routine and
         * call it.
         */

        mech = __gss_get_mechanism(ctx->mech_type);
        if (!mech) {
                status = GSS_S_BAD_MECH;
                goto error_out;
        }
        if (!mech->gss_import_sec_context) {
                status = GSS_S_UNAVAILABLE;
                goto error_out;
        }

        status = mech->gss_import_sec_context(mech->context, minor_status,
                                        &token, &ctx->internal_ctx_id);

        if (status == GSS_S_COMPLETE) {
                *context_handle = (gss_ctx_id_t)ctx;
                return (GSS_S_COMPLETE);
        }
        map_error(minor_status, mech);

error_out:
        if (ctx) {
                if (ctx->mech_type) {
                        if (ctx->mech_type->elements)
                                free(ctx->mech_type->elements);
                        free(ctx->mech_type);
                }
                free(ctx);
        }
        return (status);
}
#endif /* LEAN_CLIENT */