freebsd-dev/contrib/wpa_supplicant/eap_gtc.c
2006-03-07 05:26:33 +00:00

162 lines
4.0 KiB
C

/*
* WPA Supplicant / EAP-GTC (RFC 2284)
* 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"
struct eap_gtc_data {
int prefix;
};
static void * eap_gtc_init(struct eap_sm *sm)
{
struct eap_gtc_data *data;
data = malloc(sizeof(*data));
if (data == NULL)
return NULL;
memset(data, 0, sizeof(*data));
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;
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;
struct wpa_ssid *config = eap_get_config(sm);
const struct eap_hdr *req;
struct eap_hdr *resp;
const u8 *pos, *password;
u8 *rpos;
size_t password_len, len;
pos = eap_hdr_validate(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 || 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. */
*respDataLen = sizeof(struct eap_hdr) + 1;
resp = malloc(*respDataLen);
if (resp == NULL)
return NULL;
resp->code = EAP_CODE_RESPONSE;
resp->identifier = req->identifier;
resp->length = host_to_be16(*respDataLen);
rpos = (u8 *) (resp + 1);
*rpos++ = EAP_TYPE_GTC;
return (u8 *) resp;
}
if (config == NULL ||
(config->password == NULL && config->otp == NULL)) {
wpa_printf(MSG_INFO, "EAP-GTC: Password not configured");
eap_sm_request_otp(sm, config, (const char *) pos, len);
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 = data->prefix ? METHOD_MAY_CONT : METHOD_DONE;
ret->decision = DECISION_COND_SUCC;
ret->allowNotifications = FALSE;
*respDataLen = sizeof(struct eap_hdr) + 1 + password_len;
if (data->prefix) {
*respDataLen += 9 + config->identity_len + 1;
}
resp = malloc(*respDataLen);
if (resp == NULL)
return NULL;
resp->code = EAP_CODE_RESPONSE;
resp->identifier = req->identifier;
resp->length = host_to_be16(*respDataLen);
rpos = (u8 *) (resp + 1);
*rpos++ = EAP_TYPE_GTC;
if (data->prefix) {
memcpy(rpos, "RESPONSE=", 9);
rpos += 9;
memcpy(rpos, config->identity, config->identity_len);
rpos += config->identity_len;
*rpos++ = '\0';
}
memcpy(rpos, password, password_len);
wpa_hexdump_ascii_key(MSG_MSGDUMP, "EAP-GTC: Response",
(u8 *) (resp + 1) + 1,
*respDataLen - sizeof(struct eap_hdr) - 1);
if (config->otp) {
wpa_printf(MSG_DEBUG, "EAP-GTC: 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_gtc =
{
.method = EAP_TYPE_GTC,
.name = "GTC",
.init = eap_gtc_init,
.deinit = eap_gtc_deinit,
.process = eap_gtc_process,
};