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/*
* WPA Supplicant / EAP-OTP (RFC 3748)
* Copyright (c) 2004-2005, Jouni Malinen <jkmaline@cc.hut.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "common.h"
#include "eap_i.h"
#include "wpa_supplicant.h"
#include "config_ssid.h"
static void * eap_otp_init(struct eap_sm *sm)
{
return (void *) 1;
}
static void eap_otp_deinit(struct eap_sm *sm, void *priv)
{
}
static u8 * eap_otp_process(struct eap_sm *sm, void *priv,
struct eap_method_ret *ret,
u8 *reqData, size_t reqDataLen,
size_t *respDataLen)
{
struct wpa_ssid *config = eap_get_config(sm);
struct eap_hdr *req, *resp;
u8 *pos, *password;
size_t password_len, len;
req = (struct eap_hdr *) reqData;
pos = (u8 *) (req + 1);
if (reqDataLen < sizeof(*req) + 1 || *pos != EAP_TYPE_OTP ||
(len = be_to_host16(req->length)) > reqDataLen) {
wpa_printf(MSG_INFO, "EAP-OTP: Invalid frame");
ret->ignore = TRUE;
return NULL;
}
pos++;
wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-OTP: Request message",
pos, len - sizeof(*req) - 1);
if (config == NULL ||
(config->password == NULL && config->otp == NULL)) {
wpa_printf(MSG_INFO, "EAP-OTP: Password not configured");
eap_sm_request_otp(sm, config, (char *) pos,
len - sizeof(*req) - 1);
ret->ignore = TRUE;
return NULL;
}
if (config->otp) {
password = config->otp;
password_len = config->otp_len;
} else {
password = config->password;
password_len = config->password_len;
}
ret->ignore = FALSE;
ret->methodState = METHOD_DONE;
ret->decision = DECISION_COND_SUCC;
ret->allowNotifications = FALSE;
*respDataLen = sizeof(struct eap_hdr) + 1 + password_len;
resp = malloc(*respDataLen);
if (resp == NULL)
return NULL;
resp->code = EAP_CODE_RESPONSE;
resp->identifier = req->identifier;
resp->length = host_to_be16(*respDataLen);
pos = (u8 *) (resp + 1);
*pos++ = EAP_TYPE_OTP;
memcpy(pos, password, password_len);
wpa_hexdump_ascii_key(MSG_MSGDUMP, "EAP-OTP: Response",
password, password_len);
if (config->otp) {
wpa_printf(MSG_DEBUG, "EAP-OTP: Forgetting used password");
memset(config->otp, 0, config->otp_len);
free(config->otp);
config->otp = NULL;
config->otp_len = 0;
}
return (u8 *) resp;
}
const struct eap_method eap_method_otp =
{
.method = EAP_TYPE_OTP,
.name = "OTP",
.init = eap_otp_init,
.deinit = eap_otp_deinit,
.process = eap_otp_process,
};
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