2 * WPA Supplicant / EAP-GTC (RFC 2284)
3 * Copyright (c) 2004-2005, Jouni Malinen <jkmaline@cc.hut.fi>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * Alternatively, this software may be distributed under the terms of BSD
12 * See README and COPYING for more details.
21 #include "wpa_supplicant.h"
22 #include "config_ssid.h"
30 static void * eap_gtc_init(struct eap_sm *sm)
32 struct eap_gtc_data *data;
33 data = malloc(sizeof(*data));
36 memset(data, 0, sizeof(*data));
38 if (sm->m && sm->m->method == EAP_TYPE_FAST) {
39 wpa_printf(MSG_DEBUG, "EAP-GTC: EAP-FAST tunnel - use prefix "
40 "with challenge/response");
47 static void eap_gtc_deinit(struct eap_sm *sm, void *priv)
49 struct eap_gtc_data *data = priv;
54 static u8 * eap_gtc_process(struct eap_sm *sm, void *priv,
55 struct eap_method_ret *ret,
56 u8 *reqData, size_t reqDataLen,
59 struct eap_gtc_data *data = priv;
60 struct wpa_ssid *config = eap_get_config(sm);
61 struct eap_hdr *req, *resp;
63 size_t password_len, len, msg_len;
65 req = (struct eap_hdr *) reqData;
66 pos = (u8 *) (req + 1);
67 if (reqDataLen < sizeof(*req) + 1 || *pos != EAP_TYPE_GTC ||
68 (len = be_to_host16(req->length)) > reqDataLen) {
69 wpa_printf(MSG_INFO, "EAP-GTC: Invalid frame");
74 msg_len = len - sizeof(*req) - 1;
75 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-GTC: Request message",
78 (msg_len < 10 || memcmp(pos, "CHALLENGE=", 10) != 0)) {
79 wpa_printf(MSG_DEBUG, "EAP-GTC: Challenge did not start with "
82 /* Send an empty response in order to allow tunneled
83 * acknowledgement of the failure. This will also cover the
84 * error case which seems to use EAP-MSCHAPv2 like error
85 * reporting with EAP-GTC inside EAP-FAST tunnel. */
86 *respDataLen = sizeof(struct eap_hdr) + 1;
87 resp = malloc(*respDataLen);
90 resp->code = EAP_CODE_RESPONSE;
91 resp->identifier = req->identifier;
92 resp->length = host_to_be16(*respDataLen);
93 pos = (u8 *) (resp + 1);
94 *pos++ = EAP_TYPE_GTC;
99 (config->password == NULL && config->otp == NULL)) {
100 wpa_printf(MSG_INFO, "EAP-GTC: Password not configured");
101 eap_sm_request_otp(sm, config, (char *) pos,
102 len - sizeof(*req) - 1);
108 password = config->otp;
109 password_len = config->otp_len;
111 password = config->password;
112 password_len = config->password_len;
117 ret->methodState = data->prefix ? METHOD_MAY_CONT : METHOD_DONE;
118 ret->decision = DECISION_COND_SUCC;
119 ret->allowNotifications = FALSE;
121 *respDataLen = sizeof(struct eap_hdr) + 1 + password_len;
123 *respDataLen += 9 + config->identity_len + 1;
125 resp = malloc(*respDataLen);
128 resp->code = EAP_CODE_RESPONSE;
129 resp->identifier = req->identifier;
130 resp->length = host_to_be16(*respDataLen);
131 pos = (u8 *) (resp + 1);
132 *pos++ = EAP_TYPE_GTC;
134 memcpy(pos, "RESPONSE=", 9);
136 memcpy(pos, config->identity, config->identity_len);
137 pos += config->identity_len;
140 memcpy(pos, password, password_len);
141 wpa_hexdump_ascii_key(MSG_MSGDUMP, "EAP-GTC: Response",
142 (u8 *) (resp + 1) + 1,
143 *respDataLen - sizeof(struct eap_hdr) - 1);
146 wpa_printf(MSG_DEBUG, "EAP-GTC: Forgetting used password");
147 memset(config->otp, 0, config->otp_len);
157 const struct eap_method eap_method_gtc =
159 .method = EAP_TYPE_GTC,
161 .init = eap_gtc_init,
162 .deinit = eap_gtc_deinit,
163 .process = eap_gtc_process,