151 lines
3.6 KiB
C
151 lines
3.6 KiB
C
/*
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* EAP peer method: EAP-GTC (RFC 3748)
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* Copyright (c) 2004-2006, Jouni Malinen <j@w1.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 "includes.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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int prefix;
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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 = os_zalloc(sizeof(*data));
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if (data == NULL)
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return NULL;
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if (sm->m && sm->m->vendor == EAP_VENDOR_IETF &&
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sm->m->method == EAP_TYPE_FAST) {
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wpa_printf(MSG_DEBUG, "EAP-GTC: EAP-FAST tunnel - use prefix "
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"with challenge/response");
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data->prefix = 1;
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}
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return data;
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}
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static void eap_gtc_deinit(struct eap_sm *sm, void *priv)
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{
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struct eap_gtc_data *data = priv;
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os_free(data);
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}
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static struct wpabuf * eap_gtc_process(struct eap_sm *sm, void *priv,
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struct eap_method_ret *ret,
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const struct wpabuf *reqData)
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{
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struct eap_gtc_data *data = priv;
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struct wpabuf *resp;
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const u8 *pos, *password, *identity;
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size_t password_len, identity_len, len, plen;
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int otp;
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u8 id;
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pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_GTC, reqData, &len);
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if (pos == NULL) {
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ret->ignore = TRUE;
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return NULL;
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}
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id = eap_get_id(reqData);
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wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-GTC: Request message", pos, len);
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if (data->prefix &&
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(len < 10 || os_memcmp(pos, "CHALLENGE=", 10) != 0)) {
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wpa_printf(MSG_DEBUG, "EAP-GTC: Challenge did not start with "
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"expected prefix");
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/* Send an empty response in order to allow tunneled
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* acknowledgement of the failure. This will also cover the
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* error case which seems to use EAP-MSCHAPv2 like error
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* reporting with EAP-GTC inside EAP-FAST tunnel. */
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resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_GTC,
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0, EAP_CODE_RESPONSE, id);
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return resp;
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}
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password = eap_get_config_otp(sm, &password_len);
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if (password)
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otp = 1;
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else {
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password = eap_get_config_password(sm, &password_len);
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otp = 0;
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}
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if (password == NULL) {
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wpa_printf(MSG_INFO, "EAP-GTC: Password not configured");
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eap_sm_request_otp(sm, (const char *) pos, len);
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ret->ignore = TRUE;
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return NULL;
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}
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ret->ignore = FALSE;
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ret->methodState = data->prefix ? METHOD_MAY_CONT : METHOD_DONE;
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ret->decision = DECISION_COND_SUCC;
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ret->allowNotifications = FALSE;
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plen = password_len;
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identity = eap_get_config_identity(sm, &identity_len);
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if (identity == NULL)
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return NULL;
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if (data->prefix)
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plen += 9 + identity_len + 1;
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resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_GTC, plen,
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EAP_CODE_RESPONSE, id);
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if (resp == NULL)
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return NULL;
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if (data->prefix) {
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wpabuf_put_data(resp, "RESPONSE=", 9);
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wpabuf_put_data(resp, identity, identity_len);
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wpabuf_put_u8(resp, '\0');
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}
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wpabuf_put_data(resp, password, password_len);
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wpa_hexdump_ascii_key(MSG_MSGDUMP, "EAP-GTC: Response",
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wpabuf_head_u8(resp) + sizeof(struct eap_hdr) +
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1, plen);
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if (otp) {
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wpa_printf(MSG_DEBUG, "EAP-GTC: Forgetting used password");
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eap_clear_config_otp(sm);
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}
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return resp;
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}
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int eap_peer_gtc_register(void)
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{
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struct eap_method *eap;
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int ret;
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eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
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EAP_VENDOR_IETF, EAP_TYPE_GTC, "GTC");
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if (eap == NULL)
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return -1;
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eap->init = eap_gtc_init;
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eap->deinit = eap_gtc_deinit;
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eap->process = eap_gtc_process;
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ret = eap_peer_method_register(eap);
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if (ret)
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eap_peer_method_free(eap);
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return ret;
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}
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