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/*
* EAP peer method: EAP-GTC (RFC 3748)
* Copyright (c) 2004-2006, Jouni Malinen <j@w1.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 "includes.h"
#include "common.h"
#include "eap_i.h"
struct eap_gtc_data {
int prefix;
};
static void * eap_gtc_init(struct eap_sm *sm)
{
struct eap_gtc_data *data;
data = os_zalloc(sizeof(*data));
if (data == NULL)
return NULL;
if (sm->m && sm->m->method == EAP_TYPE_FAST) {
wpa_printf(MSG_DEBUG, "EAP-GTC: EAP-FAST tunnel - use prefix "
"with challenge/response");
data->prefix = 1;
}
return data;
}
static void eap_gtc_deinit(struct eap_sm *sm, void *priv)
{
struct eap_gtc_data *data = priv;
os_free(data);
}
static u8 * eap_gtc_process(struct eap_sm *sm, void *priv,
struct eap_method_ret *ret,
const u8 *reqData, size_t reqDataLen,
size_t *respDataLen)
{
struct eap_gtc_data *data = priv;
const struct eap_hdr *req;
struct eap_hdr *resp;
const u8 *pos, *password, *identity;
u8 *rpos;
size_t password_len, identity_len, len, plen;
int otp;
pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_GTC,
reqData, reqDataLen, &len);
if (pos == NULL) {
ret->ignore = TRUE;
return NULL;
}
req = (const struct eap_hdr *) reqData;
wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-GTC: Request message", pos, len);
if (data->prefix &&
(len < 10 || os_memcmp(pos, "CHALLENGE=", 10) != 0)) {
wpa_printf(MSG_DEBUG, "EAP-GTC: Challenge did not start with "
"expected prefix");
/* Send an empty response in order to allow tunneled
* acknowledgement of the failure. This will also cover the
* error case which seems to use EAP-MSCHAPv2 like error
* reporting with EAP-GTC inside EAP-FAST tunnel. */
resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_GTC,
respDataLen, 0, EAP_CODE_RESPONSE,
req->identifier, NULL);
return (u8 *) resp;
}
password = eap_get_config_otp(sm, &password_len);
if (password)
otp = 1;
else {
password = eap_get_config_password(sm, &password_len);
otp = 0;
}
if (password == NULL) {
wpa_printf(MSG_INFO, "EAP-GTC: Password not configured");
eap_sm_request_otp(sm, (const char *) pos, len);
ret->ignore = TRUE;
return NULL;
}
ret->ignore = FALSE;
ret->methodState = data->prefix ? METHOD_MAY_CONT : METHOD_DONE;
ret->decision = DECISION_COND_SUCC;
ret->allowNotifications = FALSE;
plen = password_len;
identity = eap_get_config_identity(sm, &identity_len);
if (identity == NULL)
return NULL;
if (data->prefix)
plen += 9 + identity_len + 1;
resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_GTC, respDataLen,
plen, EAP_CODE_RESPONSE, req->identifier, &rpos);
if (resp == NULL)
return NULL;
if (data->prefix) {
os_memcpy(rpos, "RESPONSE=", 9);
rpos += 9;
os_memcpy(rpos, identity, identity_len);
rpos += identity_len;
*rpos++ = '\0';
}
os_memcpy(rpos, password, password_len);
wpa_hexdump_ascii_key(MSG_MSGDUMP, "EAP-GTC: Response",
(u8 *) (resp + 1) + 1, plen);
if (otp) {
wpa_printf(MSG_DEBUG, "EAP-GTC: Forgetting used password");
eap_clear_config_otp(sm);
}
return (u8 *) resp;
}
int eap_peer_gtc_register(void)
{
struct eap_method *eap;
int ret;
eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
EAP_VENDOR_IETF, EAP_TYPE_GTC, "GTC");
if (eap == NULL)
return -1;
eap->init = eap_gtc_init;
eap->deinit = eap_gtc_deinit;
eap->process = eap_gtc_process;
ret = eap_peer_method_register(eap);
if (ret)
eap_peer_method_free(eap);
return ret;
}
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