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 const u8 *reqData, size_t reqDataLen,
59 struct eap_gtc_data *data = priv;
60 struct wpa_ssid *config = eap_get_config(sm);
61 const struct eap_hdr *req;
63 const u8 *pos, *password;
65 size_t password_len, len;
67 pos = eap_hdr_validate(EAP_TYPE_GTC, reqData, reqDataLen, &len);
72 req = (const struct eap_hdr *) reqData;
74 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-GTC: Request message", pos, len);
76 (len < 10 || memcmp(pos, "CHALLENGE=", 10) != 0)) {
77 wpa_printf(MSG_DEBUG, "EAP-GTC: Challenge did not start with "
80 /* Send an empty response in order to allow tunneled
81 * acknowledgement of the failure. This will also cover the
82 * error case which seems to use EAP-MSCHAPv2 like error
83 * reporting with EAP-GTC inside EAP-FAST tunnel. */
84 *respDataLen = sizeof(struct eap_hdr) + 1;
85 resp = malloc(*respDataLen);
88 resp->code = EAP_CODE_RESPONSE;
89 resp->identifier = req->identifier;
90 resp->length = host_to_be16(*respDataLen);
91 rpos = (u8 *) (resp + 1);
92 *rpos++ = EAP_TYPE_GTC;
97 (config->password == NULL && config->otp == NULL)) {
98 wpa_printf(MSG_INFO, "EAP-GTC: Password not configured");
99 eap_sm_request_otp(sm, config, (const char *) pos, len);
105 password = config->otp;
106 password_len = config->otp_len;
108 password = config->password;
109 password_len = config->password_len;
114 ret->methodState = data->prefix ? METHOD_MAY_CONT : METHOD_DONE;
115 ret->decision = DECISION_COND_SUCC;
116 ret->allowNotifications = FALSE;
118 *respDataLen = sizeof(struct eap_hdr) + 1 + password_len;
120 *respDataLen += 9 + config->identity_len + 1;
122 resp = malloc(*respDataLen);
125 resp->code = EAP_CODE_RESPONSE;
126 resp->identifier = req->identifier;
127 resp->length = host_to_be16(*respDataLen);
128 rpos = (u8 *) (resp + 1);
129 *rpos++ = EAP_TYPE_GTC;
131 memcpy(rpos, "RESPONSE=", 9);
133 memcpy(rpos, config->identity, config->identity_len);
134 rpos += config->identity_len;
137 memcpy(rpos, password, password_len);
138 wpa_hexdump_ascii_key(MSG_MSGDUMP, "EAP-GTC: Response",
139 (u8 *) (resp + 1) + 1,
140 *respDataLen - sizeof(struct eap_hdr) - 1);
143 wpa_printf(MSG_DEBUG, "EAP-GTC: Forgetting used password");
144 memset(config->otp, 0, config->otp_len);
154 const struct eap_method eap_method_gtc =
156 .method = EAP_TYPE_GTC,
158 .init = eap_gtc_init,
159 .deinit = eap_gtc_deinit,
160 .process = eap_gtc_process,