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/*
* Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2010 Free Software
* Foundation, Inc.
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GnuTLS.
*
* The GnuTLS is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA
*
*/
#include <gnutls_int.h>
#ifdef ENABLE_SRP
#include "gnutls_errors.h"
#include "auth_srp_passwd.h"
#include "gnutls_auth.h"
#include "gnutls_auth.h"
#include "gnutls_srp.h"
#include "debug.h"
#include "gnutls_num.h"
#include "auth_srp.h"
#include <gnutls_str.h>
#include <auth_cert.h>
#include <gnutls_datum.h>
#include <gnutls_sig.h>
#include <auth_srp.h>
#include <gnutls_x509.h>
static int gen_srp_cert_server_kx (gnutls_session_t, opaque **);
static int proc_srp_cert_server_kx (gnutls_session_t, opaque *, size_t);
const mod_auth_st srp_rsa_auth_struct = {
"SRP",
_gnutls_gen_cert_server_certificate,
NULL,
gen_srp_cert_server_kx,
_gnutls_gen_srp_client_kx,
NULL,
NULL,
_gnutls_proc_cert_server_certificate,
NULL, /* certificate */
proc_srp_cert_server_kx,
_gnutls_proc_srp_client_kx,
NULL,
NULL
};
const mod_auth_st srp_dss_auth_struct = {
"SRP",
_gnutls_gen_cert_server_certificate,
NULL,
gen_srp_cert_server_kx,
_gnutls_gen_srp_client_kx,
NULL,
NULL,
_gnutls_proc_cert_server_certificate,
NULL, /* certificate */
proc_srp_cert_server_kx,
_gnutls_proc_srp_client_kx,
NULL,
NULL
};
static int
gen_srp_cert_server_kx (gnutls_session_t session, opaque ** data)
{
ssize_t ret, data_size;
gnutls_datum_t signature, ddata;
gnutls_certificate_credentials_t cred;
gnutls_cert *apr_cert_list;
gnutls_privkey_t apr_pkey;
int apr_cert_list_length;
gnutls_sign_algorithm_t sign_algo;
ret = _gnutls_gen_srp_server_kx (session, data);
if (ret < 0)
return ret;
data_size = ret;
ddata.data = *data;
ddata.size = data_size;
cred = (gnutls_certificate_credentials_t)
_gnutls_get_cred (session->key, GNUTLS_CRD_CERTIFICATE, NULL);
if (cred == NULL)
{
gnutls_assert ();
return GNUTLS_E_INSUFFICIENT_CREDENTIALS;
}
/* find the appropriate certificate */
if ((ret =
_gnutls_get_selected_cert (session, &apr_cert_list,
&apr_cert_list_length, &apr_pkey)) < 0)
{
gnutls_assert ();
return ret;
}
if ((ret =
_gnutls_handshake_sign_data (session, &apr_cert_list[0],
apr_pkey, &ddata, &signature,
&sign_algo)) < 0)
{
gnutls_assert ();
gnutls_free (*data);
return ret;
}
*data = gnutls_realloc_fast (*data, data_size + signature.size + 2);
if (*data == NULL)
{
_gnutls_free_datum (&signature);
gnutls_assert ();
return GNUTLS_E_MEMORY_ERROR;
}
_gnutls_write_datum16 (&(*data)[data_size], signature);
data_size += signature.size + 2;
_gnutls_free_datum (&signature);
return data_size;
}
static int
proc_srp_cert_server_kx (gnutls_session_t session, opaque * data,
size_t _data_size)
{
ssize_t ret;
int sigsize;
gnutls_datum_t vparams, signature;
ssize_t data_size;
cert_auth_info_t info;
gnutls_cert peer_cert;
opaque *p;
ret = _gnutls_proc_srp_server_kx (session, data, _data_size);
if (ret < 0)
return ret;
data_size = _data_size - ret;
info = _gnutls_get_auth_info (session);
if (info == NULL || info->ncerts == 0)
{
gnutls_assert ();
/* we need this in order to get peer's certificate */
return GNUTLS_E_INTERNAL_ERROR;
}
/* VERIFY SIGNATURE */
vparams.size = ret; /* all the data minus the signature */
vparams.data = data;
p = &data[vparams.size];
DECR_LEN (data_size, 2);
sigsize = _gnutls_read_uint16 (p);
DECR_LEN (data_size, sigsize);
signature.data = &p[2];
signature.size = sigsize;
ret =
_gnutls_get_auth_info_gcert (&peer_cert,
session->security_parameters.cert_type,
info, CERT_NO_COPY);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
ret =
_gnutls_handshake_verify_data (session, &peer_cert, &vparams, &signature,
GNUTLS_SIGN_UNKNOWN);
_gnutls_gcert_deinit (&peer_cert);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
return 0;
}
#endif /* ENABLE_SRP */
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