159 lines
3.3 KiB
C
159 lines
3.3 KiB
C
/*
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* hostapd / EAP-GTC (RFC 3748)
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* Copyright (c) 2004, Jouni Malinen <jkmaline@cc.hut.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <netinet/in.h>
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#include "hostapd.h"
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#include "common.h"
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#include "eap_i.h"
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struct eap_gtc_data {
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enum { CONTINUE, SUCCESS, FAILURE } state;
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};
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static void * eap_gtc_init(struct eap_sm *sm)
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{
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struct eap_gtc_data *data;
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data = malloc(sizeof(*data));
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if (data == NULL)
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return data;
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memset(data, 0, sizeof(*data));
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data->state = CONTINUE;
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return data;
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}
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static void eap_gtc_reset(struct eap_sm *sm, void *priv)
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{
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struct eap_gtc_data *data = priv;
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free(data);
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}
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static u8 * eap_gtc_buildReq(struct eap_sm *sm, void *priv, int id,
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size_t *reqDataLen)
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{
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struct eap_gtc_data *data = priv;
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struct eap_hdr *req;
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u8 *pos;
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char *msg = "Password";
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size_t msg_len;
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msg_len = strlen(msg);
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*reqDataLen = sizeof(*req) + 1 + msg_len;
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req = malloc(*reqDataLen);
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if (req == NULL) {
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wpa_printf(MSG_ERROR, "EAP-GTC: Failed to allocate memory for "
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"request");
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data->state = FAILURE;
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return NULL;
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}
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req->code = EAP_CODE_REQUEST;
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req->identifier = id;
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req->length = htons(*reqDataLen);
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pos = (u8 *) (req + 1);
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*pos++ = EAP_TYPE_GTC;
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memcpy(pos, msg, msg_len);
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data->state = CONTINUE;
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return (u8 *) req;
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}
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static Boolean eap_gtc_check(struct eap_sm *sm, void *priv,
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u8 *respData, size_t respDataLen)
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{
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struct eap_hdr *resp;
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u8 *pos;
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size_t len;
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resp = (struct eap_hdr *) respData;
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pos = (u8 *) (resp + 1);
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if (respDataLen < sizeof(*resp) + 2 || *pos != EAP_TYPE_GTC ||
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(len = ntohs(resp->length)) > respDataLen) {
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wpa_printf(MSG_INFO, "EAP-GTC: Invalid frame");
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return TRUE;
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}
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return FALSE;
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}
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static void eap_gtc_process(struct eap_sm *sm, void *priv,
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u8 *respData, size_t respDataLen)
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{
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struct eap_gtc_data *data = priv;
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struct eap_hdr *resp;
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u8 *pos;
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size_t rlen;
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if (sm->user == NULL || sm->user->password == NULL) {
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wpa_printf(MSG_INFO, "EAP-GTC: Password not configured");
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data->state = FAILURE;
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return;
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}
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resp = (struct eap_hdr *) respData;
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pos = (u8 *) (resp + 1);
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pos++;
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rlen = ntohs(resp->length) - sizeof(*resp) - 1;
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wpa_hexdump_key(MSG_MSGDUMP, "EAP-GTC: Response", pos, rlen);
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if (rlen != sm->user->password_len ||
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memcmp(pos, sm->user->password, rlen) != 0) {
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wpa_printf(MSG_DEBUG, "EAP-GTC: Done - Failure");
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data->state = FAILURE;
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} else {
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wpa_printf(MSG_DEBUG, "EAP-GTC: Done - Success");
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data->state = SUCCESS;
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}
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}
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static Boolean eap_gtc_isDone(struct eap_sm *sm, void *priv)
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{
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struct eap_gtc_data *data = priv;
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return data->state != CONTINUE;
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}
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static Boolean eap_gtc_isSuccess(struct eap_sm *sm, void *priv)
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{
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struct eap_gtc_data *data = priv;
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return data->state == SUCCESS;
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}
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const struct eap_method eap_method_gtc =
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{
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.method = EAP_TYPE_GTC,
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.name = "GTC",
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.init = eap_gtc_init,
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.reset = eap_gtc_reset,
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.buildReq = eap_gtc_buildReq,
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.check = eap_gtc_check,
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.process = eap_gtc_process,
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.isDone = eap_gtc_isDone,
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.isSuccess = eap_gtc_isSuccess,
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};
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