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* EAP peer method: EAP-TLS (RFC 2716)
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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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#include "eap_tls_common.h"
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#include "config_ssid.h"
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static void eap_tls_deinit(struct eap_sm *sm, void *priv);
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struct eap_ssl_data ssl;
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static void * eap_tls_init(struct eap_sm *sm)
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struct eap_tls_data *data;
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struct wpa_ssid *config = eap_get_config(sm);
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((sm->init_phase2 ? config->private_key2 : config->private_key)
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== NULL && config->engine == 0)) {
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wpa_printf(MSG_INFO, "EAP-TLS: Private key not configured");
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data = os_zalloc(sizeof(*data));
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if (eap_tls_ssl_init(sm, &data->ssl, config)) {
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wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL.");
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eap_tls_deinit(sm, data);
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wpa_printf(MSG_DEBUG, "EAP-TLS: Requesting Smartcard "
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eap_sm_request_pin(sm);
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} else if (config->private_key && !config->private_key_passwd)
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wpa_printf(MSG_DEBUG, "EAP-TLS: Requesting private "
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eap_sm_request_passphrase(sm);
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static void eap_tls_deinit(struct eap_sm *sm, void *priv)
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struct eap_tls_data *data = priv;
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eap_tls_ssl_deinit(sm, &data->ssl);
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os_free(data->key_data);
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static u8 * eap_tls_failure(struct eap_sm *sm, struct eap_tls_data *data,
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struct eap_method_ret *ret, int res, u8 *resp,
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u8 id, size_t *respDataLen)
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wpa_printf(MSG_DEBUG, "EAP-TLS: TLS processing failed");
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ret->methodState = METHOD_DONE;
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ret->decision = DECISION_FAIL;
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struct wpa_ssid *config = eap_get_config(sm);
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* The TLS handshake failed. So better forget the old
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* PIN. It may be wrong, we cannot be sure but trying
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* the wrong one again might block it on the card--so
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* better ask the user again.
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* This is likely an alert message, so send it instead of just
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return eap_tls_build_ack(&data->ssl, respDataLen, id, EAP_TYPE_TLS, 0);
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static void eap_tls_success(struct eap_sm *sm, struct eap_tls_data *data,
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struct eap_method_ret *ret)
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wpa_printf(MSG_DEBUG, "EAP-TLS: Done");
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ret->methodState = METHOD_DONE;
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ret->decision = DECISION_UNCOND_SUCC;
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os_free(data->key_data);
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data->key_data = eap_tls_derive_key(sm, &data->ssl,
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"client EAP encryption",
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EAP_TLS_KEY_LEN + EAP_EMSK_LEN);
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if (data->key_data) {
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wpa_hexdump_key(MSG_DEBUG, "EAP-TLS: Derived key",
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data->key_data, EAP_TLS_KEY_LEN);
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wpa_hexdump_key(MSG_DEBUG, "EAP-TLS: Derived EMSK",
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data->key_data + EAP_TLS_KEY_LEN,
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wpa_printf(MSG_INFO, "EAP-TLS: Failed to derive key");
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static u8 * eap_tls_process(struct eap_sm *sm, void *priv,
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struct eap_method_ret *ret,
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const u8 *reqData, size_t reqDataLen,
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const struct eap_hdr *req;
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struct eap_tls_data *data = priv;
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pos = eap_tls_process_init(sm, &data->ssl, EAP_TYPE_TLS, ret,
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reqData, reqDataLen, &left, &flags);
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req = (const struct eap_hdr *) reqData;
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id = req->identifier;
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if (flags & EAP_TLS_FLAGS_START) {
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wpa_printf(MSG_DEBUG, "EAP-TLS: Start");
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left = 0; /* make sure that this frame is empty, even though it
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* should always be, anyway */
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res = eap_tls_process_helper(sm, &data->ssl, EAP_TYPE_TLS, 0, id, pos,
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left, &resp, respDataLen);
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return eap_tls_failure(sm, data, ret, res, resp, id,
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if (tls_connection_established(sm->ssl_ctx, data->ssl.conn))
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eap_tls_success(sm, data, ret);
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return eap_tls_build_ack(&data->ssl, respDataLen, id,
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static Boolean eap_tls_has_reauth_data(struct eap_sm *sm, void *priv)
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struct eap_tls_data *data = priv;
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return tls_connection_established(sm->ssl_ctx, data->ssl.conn);
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static void eap_tls_deinit_for_reauth(struct eap_sm *sm, void *priv)
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static void * eap_tls_init_for_reauth(struct eap_sm *sm, void *priv)
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struct eap_tls_data *data = priv;
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os_free(data->key_data);
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data->key_data = NULL;
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if (eap_tls_reauth_init(sm, &data->ssl)) {
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static int eap_tls_get_status(struct eap_sm *sm, void *priv, char *buf,
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size_t buflen, int verbose)
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struct eap_tls_data *data = priv;
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return eap_tls_status(sm, &data->ssl, buf, buflen, verbose);
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static Boolean eap_tls_isKeyAvailable(struct eap_sm *sm, void *priv)
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struct eap_tls_data *data = priv;
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return data->key_data != NULL;
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static u8 * eap_tls_getKey(struct eap_sm *sm, void *priv, size_t *len)
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struct eap_tls_data *data = priv;
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if (data->key_data == NULL)
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key = os_malloc(EAP_TLS_KEY_LEN);
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*len = EAP_TLS_KEY_LEN;
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os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
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static u8 * eap_tls_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
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struct eap_tls_data *data = priv;
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if (data->key_data == NULL)
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key = os_malloc(EAP_EMSK_LEN);
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os_memcpy(key, data->key_data + EAP_TLS_KEY_LEN, EAP_EMSK_LEN);
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int eap_peer_tls_register(void)
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struct eap_method *eap;
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eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
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EAP_VENDOR_IETF, EAP_TYPE_TLS, "TLS");
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eap->init = eap_tls_init;
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eap->deinit = eap_tls_deinit;
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eap->process = eap_tls_process;
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eap->isKeyAvailable = eap_tls_isKeyAvailable;
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eap->getKey = eap_tls_getKey;
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eap->get_status = eap_tls_get_status;
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eap->has_reauth_data = eap_tls_has_reauth_data;
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eap->deinit_for_reauth = eap_tls_deinit_for_reauth;
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eap->init_for_reauth = eap_tls_init_for_reauth;
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eap->get_emsk = eap_tls_get_emsk;
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ret = eap_peer_method_register(eap);
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eap_peer_method_free(eap);