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/*
* Copyright (C) 2005, 2006, 2008, 2010 Free Software Foundation, Inc.
*
* Author: Simon Josefsson
*
* This file is part of GnuTLS-EXTRA.
*
* GnuTLS-extra is free software: you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* GnuTLS-extra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see
* <http://www.gnu.org/licenses/>.
*
*/
#include "gnutls_int.h"
#include "gnutls_auth.h"
#include "gnutls_errors.h"
#include "gnutls_num.h"
#include "ext_inner_application.h"
#include <gnutls/extra.h>
#define NO 0
#define YES 1
int
_gnutls_inner_application_recv_params (gnutls_session_t session,
const opaque * data, size_t data_size)
{
tls_ext_st *ext = &session->security_parameters.extensions;
if (data_size != 1)
{
gnutls_assert ();
return GNUTLS_E_UNEXPECTED_PACKET_LENGTH;
}
ext->gnutls_ia_peer_enable = 1;
ext->gnutls_ia_peer_allowskip = 0;
switch ((unsigned char) *data)
{
case NO: /* Peer's ia_on_resume == no */
ext->gnutls_ia_peer_allowskip = 1;
break;
case YES:
break;
default:
gnutls_assert ();
}
return 0;
}
/* returns data_size or a negative number on failure
*/
int
_gnutls_inner_application_send_params (gnutls_session_t session,
opaque * data, size_t data_size)
{
tls_ext_st *ext = &session->security_parameters.extensions;
/* Set ext->gnutls_ia_enable depending on whether we have a TLS/IA
credential in the session. */
if (session->security_parameters.entity == GNUTLS_CLIENT)
{
gnutls_ia_client_credentials_t cred = (gnutls_ia_client_credentials_t)
_gnutls_get_cred (session->key, GNUTLS_CRD_IA, NULL);
if (cred)
ext->gnutls_ia_enable = 1;
}
else
{
gnutls_ia_server_credentials_t cred = (gnutls_ia_server_credentials_t)
_gnutls_get_cred (session->key, GNUTLS_CRD_IA, NULL);
if (cred)
ext->gnutls_ia_enable = 1;
}
/* If we don't want gnutls_ia locally, or we are a server and the
* client doesn't want it, don't advertise TLS/IA support at all, as
* required. */
if (!ext->gnutls_ia_enable)
return 0;
if (session->security_parameters.entity == GNUTLS_SERVER &&
!ext->gnutls_ia_peer_enable)
return 0;
/* We'll advertise. Check if there's room in the hello buffer. */
if (data_size < 1)
{
gnutls_assert ();
return GNUTLS_E_SHORT_MEMORY_BUFFER;
}
/* default: require new application phase */
*data = YES;
if (session->security_parameters.entity == GNUTLS_CLIENT)
{
/* Client: value follows local setting */
if (ext->gnutls_ia_allowskip)
*data = NO;
}
else
{
/* Server: value follows local setting and client's setting, but only
* if we are resuming.
*
* XXX Can server test for resumption at this stage?
*
* Ai! It seems that read_client_hello only calls parse_extensions if
* we're NOT resuming! That would make us automatically violate the IA
* draft; if we're resuming, we must first learn what the client wants
* -- IA or no IA -- and then prepare our response. Right now we'll
* always skip IA on resumption, because recv_ext isn't even called
* to record the peer's support for IA at all. Simon? */
if (ext->gnutls_ia_allowskip &&
ext->gnutls_ia_peer_allowskip &&
session->internals.resumed == RESUME_TRUE)
*data = NO;
}
return 1;
}
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