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/*
* Copyright (C) 2001,2002 Nikos Mavroyanopoulos
*
* This file is part of GNUTLS.
*
* GNUTLS 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 2 of the License, or
* (at your option) any later version.
*
* GNUTLS 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include "gnutls_int.h"
#ifdef ENABLE_SRP
#include "gnutls_auth_int.h"
#include "auth_srp.h"
#include "gnutls_errors.h"
#include "gnutls_algorithms.h"
int _gnutls_srp_recv_params( GNUTLS_STATE state, const opaque* data, int data_size) {
uint8 len;
if (_gnutls_kx_priority( state, GNUTLS_KX_SRP) < 0) {
/* algorithm was not allowed in this state
*/
return 0;
}
if (state->security_parameters.entity == GNUTLS_SERVER) {
if (data_size > 0) {
len = data[0];
if (len > data_size) {
gnutls_assert();
return GNUTLS_E_UNEXPECTED_PACKET_LENGTH;
}
if ( sizeof( state->security_parameters.extensions.srp_username) <= len) {
gnutls_assert();
return GNUTLS_E_MEMORY_ERROR;
}
memcpy( state->security_parameters.extensions.srp_username, &data[1], len);
state->security_parameters.extensions.srp_username[len]=0; /* null terminated */
}
} else { /* client side reading server hello extensions */
if (state->gnutls_internals.resumed==RESUME_FALSE)
return proc_srp_server_hello( state, data, data_size);
else /* we do not need to process this if
* we are resuming.
*/
return 0;
}
return 0;
}
/* returns data_size or a negative number on failure
* data is allocated localy
*/
int _gnutls_srp_send_params( GNUTLS_STATE state, opaque** data) {
uint8 len;
if (_gnutls_kx_priority( state, GNUTLS_KX_SRP) < 0) {
/* algorithm was not allowed in this state
*/
return 0;
}
/* this function sends the client extension data (username) */
if (state->security_parameters.entity == GNUTLS_CLIENT) {
const GNUTLS_SRP_CLIENT_CREDENTIALS cred = _gnutls_get_cred( state->gnutls_key, GNUTLS_CRD_SRP, NULL);
(*data) = NULL;
if (cred==NULL) return 0;
if (cred->username!=NULL) { /* send username */
len = strlen(cred->username);
(*data) = gnutls_malloc(len+1); /* hold the size also */
if (*data==NULL) return GNUTLS_E_MEMORY_ERROR;
(*data)[0] = len;
memcpy( &(*data)[1], cred->username, len);
return len + 1;
}
} else { /* SERVER SIDE sending (g,n,s) */
/* We only send the packet if we are NOT
* resuming AND we are using SRP
*/
/* note that security parameters are not fully established
*/
if ( _gnutls_cipher_suite_get_kx_algo(state->security_parameters.current_cipher_suite) != GNUTLS_KX_SRP)
return 0; /* no data to send */
if (state->gnutls_internals.resumed==RESUME_FALSE)
return gen_srp_server_hello( state, data);
else
return 0;
}
return 0;
}
#endif /* ENABLE_SRP */
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