/* #pragma ident        "@(#)g_imp_sec_context.c        1.18    04/02/23 SMI" */

/*
 * Copyright 1996 by Sun Microsystems, Inc.
 *
 * Permission to use, copy, modify, distribute, and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appears in all copies and
 * that both that copyright notice and this permission notice appear in
 * supporting documentation, and that the name of Sun Microsystems not be used
 * in advertising or publicity pertaining to distribution of the software
 * without specific, written prior permission. Sun Microsystems makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 * SUN MICROSYSTEMS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL SUN MICROSYSTEMS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
 * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

/*
 *  glue routine gss_export_sec_context
 */

#ifndef LEAN_CLIENT

#include "mglueP.h"
#include <stdio.h>
#include <errno.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#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 KRB5_CALLCONV
gss_import_sec_context(OM_uint32 *minor_status,
                       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_ctx_id_t        mctx;
    gss_buffer_desc     token;
    gss_OID_desc        token_mech;
    gss_OID             selected_mech = GSS_C_NO_OID;
    gss_OID             public_mech;
    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;

    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))) {
        return (GSS_S_CALL_BAD_STRUCTURE | GSS_S_DEFECTIVE_TOKEN);
    }

    token_mech.length = length;
    token_mech.elements = p;

    p += length;

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

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

    status = gssint_select_mech_type(minor_status, &token_mech,
                                     &selected_mech);
    if (status != GSS_S_COMPLETE)
        return status;

    mech = gssint_get_mechanism(selected_mech);
    if (!mech)
        return GSS_S_BAD_MECH;
    if (!mech->gssspi_import_sec_context_by_mech &&
        !mech->gss_import_sec_context)
        return GSS_S_UNAVAILABLE;

    status = gssint_create_union_context(minor_status, selected_mech, &ctx);
    if (status != GSS_S_COMPLETE)
        return status;

    if (mech->gssspi_import_sec_context_by_mech) {
        public_mech = gssint_get_public_oid(selected_mech);
        status = mech->gssspi_import_sec_context_by_mech(minor_status,
                                                         public_mech,
                                                         &token, &mctx);
    } else {
        status = mech->gss_import_sec_context(minor_status, &token, &mctx);
    }
    if (status == GSS_S_COMPLETE) {
        ctx->internal_ctx_id = mctx;
        *context_handle = (gss_ctx_id_t)ctx;
        return (GSS_S_COMPLETE);
    }
    map_error(minor_status, mech);
    free(ctx->mech_type->elements);
    free(ctx->mech_type);
    free(ctx);
    return status;
}
#endif /* LEAN_CLIENT */