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* hostapd / EAP-GTC (RFC 3748)
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* Copyright (c) 2004-2006, Jouni Malinen <j@w1.fi>
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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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* Alternatively, this software may be distributed under the terms of BSD
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* See README and COPYING for more details.
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enum { CONTINUE, SUCCESS, FAILURE } state;
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static void * eap_gtc_init(struct eap_sm *sm)
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struct eap_gtc_data *data;
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data = os_zalloc(sizeof(*data));
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data->state = CONTINUE;
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static void eap_gtc_reset(struct eap_sm *sm, void *priv)
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struct eap_gtc_data *data = priv;
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static u8 * eap_gtc_buildReq(struct eap_sm *sm, void *priv, int id,
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struct eap_gtc_data *data = priv;
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char *msg = "Password";
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msg_len = strlen(msg);
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req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_GTC, reqDataLen,
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msg_len, EAP_CODE_REQUEST, id, &pos);
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wpa_printf(MSG_ERROR, "EAP-GTC: Failed to allocate memory for "
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data->state = FAILURE;
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memcpy(pos, msg, msg_len);
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data->state = CONTINUE;
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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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pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_GTC,
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respData, respDataLen, &len);
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if (pos == NULL || len < 1) {
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wpa_printf(MSG_INFO, "EAP-GTC: Invalid frame");
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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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struct eap_gtc_data *data = priv;
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if (sm->user == NULL || sm->user->password == NULL ||
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sm->user->password_hash) {
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wpa_printf(MSG_INFO, "EAP-GTC: Plaintext password not "
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data->state = FAILURE;
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pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_GTC,
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respData, respDataLen, &rlen);
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if (pos == NULL || rlen < 1)
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return; /* Should not happen - frame already validated */
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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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wpa_printf(MSG_DEBUG, "EAP-GTC: Done - Success");
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data->state = SUCCESS;
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static Boolean eap_gtc_isDone(struct eap_sm *sm, void *priv)
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struct eap_gtc_data *data = priv;
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return data->state != CONTINUE;
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static Boolean eap_gtc_isSuccess(struct eap_sm *sm, void *priv)
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struct eap_gtc_data *data = priv;
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return data->state == SUCCESS;
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int eap_server_gtc_register(void)
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struct eap_method *eap;
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eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
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EAP_VENDOR_IETF, EAP_TYPE_GTC, "GTC");
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eap->init = eap_gtc_init;
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eap->reset = eap_gtc_reset;
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eap->buildReq = eap_gtc_buildReq;
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eap->check = eap_gtc_check;
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eap->process = eap_gtc_process;
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eap->isDone = eap_gtc_isDone;
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eap->isSuccess = eap_gtc_isSuccess;
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ret = eap_server_method_register(eap);
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eap_server_method_free(eap);