--- /dev/null
+/*
+ * EAP peer method: EAP-TLS (RFC 2716)
+ * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Alternatively, this software may be distributed under the terms of BSD
+ * license.
+ *
+ * See README and COPYING for more details.
+ */
+
+#include "includes.h"
+
+#include "common.h"
+#include "crypto/tls.h"
+#include "eap_i.h"
+#include "eap_tls_common.h"
+#include "eap_config.h"
+
+
+static void eap_tls_deinit(struct eap_sm *sm, void *priv);
+
+
+struct eap_tls_data {
+ struct eap_ssl_data ssl;
+ u8 *key_data;
+};
+
+
+static void * eap_tls_init(struct eap_sm *sm)
+{
+ struct eap_tls_data *data;
+ struct eap_peer_config *config = eap_get_config(sm);
+ if (config == NULL ||
+ ((sm->init_phase2 ? config->private_key2 : config->private_key)
+ == NULL &&
+ (sm->init_phase2 ? config->engine2 : config->engine) == 0)) {
+ wpa_printf(MSG_INFO, "EAP-TLS: Private key not configured");
+ return NULL;
+ }
+
+ data = os_zalloc(sizeof(*data));
+ if (data == NULL)
+ return NULL;
+
+ if (eap_peer_tls_ssl_init(sm, &data->ssl, config)) {
+ wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL.");
+ eap_tls_deinit(sm, data);
+ if (config->engine) {
+ wpa_printf(MSG_DEBUG, "EAP-TLS: Requesting Smartcard "
+ "PIN");
+ eap_sm_request_pin(sm);
+ sm->ignore = TRUE;
+ } else if (config->private_key && !config->private_key_passwd)
+ {
+ wpa_printf(MSG_DEBUG, "EAP-TLS: Requesting private "
+ "key passphrase");
+ eap_sm_request_passphrase(sm);
+ sm->ignore = TRUE;
+ }
+ return NULL;
+ }
+
+ return data;
+}
+
+
+static void eap_tls_deinit(struct eap_sm *sm, void *priv)
+{
+ struct eap_tls_data *data = priv;
+ if (data == NULL)
+ return;
+ eap_peer_tls_ssl_deinit(sm, &data->ssl);
+ os_free(data->key_data);
+ os_free(data);
+}
+
+
+static struct wpabuf * eap_tls_failure(struct eap_sm *sm,
+ struct eap_tls_data *data,
+ struct eap_method_ret *ret, int res,
+ struct wpabuf *resp, u8 id)
+{
+ wpa_printf(MSG_DEBUG, "EAP-TLS: TLS processing failed");
+
+ ret->methodState = METHOD_DONE;
+ ret->decision = DECISION_FAIL;
+
+ if (res == -1) {
+ struct eap_peer_config *config = eap_get_config(sm);
+ if (config) {
+ /*
+ * The TLS handshake failed. So better forget the old
+ * PIN. It may be wrong, we cannot be sure but trying
+ * the wrong one again might block it on the card--so
+ * better ask the user again.
+ */
+ os_free(config->pin);
+ config->pin = NULL;
+ }
+ }
+
+ if (resp) {
+ /*
+ * This is likely an alert message, so send it instead of just
+ * ACKing the error.
+ */
+ return resp;
+ }
+
+ return eap_peer_tls_build_ack(id, EAP_TYPE_TLS, 0);
+}
+
+
+static void eap_tls_success(struct eap_sm *sm, struct eap_tls_data *data,
+ struct eap_method_ret *ret)
+{
+ wpa_printf(MSG_DEBUG, "EAP-TLS: Done");
+
+ ret->methodState = METHOD_DONE;
+ ret->decision = DECISION_UNCOND_SUCC;
+
+ os_free(data->key_data);
+ data->key_data = eap_peer_tls_derive_key(sm, &data->ssl,
+ "client EAP encryption",
+ EAP_TLS_KEY_LEN +
+ EAP_EMSK_LEN);
+ if (data->key_data) {
+ wpa_hexdump_key(MSG_DEBUG, "EAP-TLS: Derived key",
+ data->key_data, EAP_TLS_KEY_LEN);
+ wpa_hexdump_key(MSG_DEBUG, "EAP-TLS: Derived EMSK",
+ data->key_data + EAP_TLS_KEY_LEN,
+ EAP_EMSK_LEN);
+ } else {
+ wpa_printf(MSG_INFO, "EAP-TLS: Failed to derive key");
+ }
+}
+
+
+static struct wpabuf * eap_tls_process(struct eap_sm *sm, void *priv,
+ struct eap_method_ret *ret,
+ const struct wpabuf *reqData)
+{
+ size_t left;
+ int res;
+ struct wpabuf *resp;
+ u8 flags, id;
+ const u8 *pos;
+ struct eap_tls_data *data = priv;
+
+ pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_TLS, ret,
+ reqData, &left, &flags);
+ if (pos == NULL)
+ return NULL;
+ id = eap_get_id(reqData);
+
+ if (flags & EAP_TLS_FLAGS_START) {
+ wpa_printf(MSG_DEBUG, "EAP-TLS: Start");
+ left = 0; /* make sure that this frame is empty, even though it
+ * should always be, anyway */
+ }
+
+ resp = NULL;
+ res = eap_peer_tls_process_helper(sm, &data->ssl, EAP_TYPE_TLS, 0, id,
+ pos, left, &resp);
+
+ if (res < 0) {
+ return eap_tls_failure(sm, data, ret, res, resp, id);
+ }
+
+ if (tls_connection_established(sm->ssl_ctx, data->ssl.conn))
+ eap_tls_success(sm, data, ret);
+
+ if (res == 1) {
+ wpabuf_free(resp);
+ return eap_peer_tls_build_ack(id, EAP_TYPE_TLS, 0);
+ }
+
+ return resp;
+}
+
+
+static Boolean eap_tls_has_reauth_data(struct eap_sm *sm, void *priv)
+{
+ struct eap_tls_data *data = priv;
+ return tls_connection_established(sm->ssl_ctx, data->ssl.conn);
+}
+
+
+static void eap_tls_deinit_for_reauth(struct eap_sm *sm, void *priv)
+{
+}
+
+
+static void * eap_tls_init_for_reauth(struct eap_sm *sm, void *priv)
+{
+ struct eap_tls_data *data = priv;
+ os_free(data->key_data);
+ data->key_data = NULL;
+ if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
+ os_free(data);
+ return NULL;
+ }
+ return priv;
+}
+
+
+static int eap_tls_get_status(struct eap_sm *sm, void *priv, char *buf,
+ size_t buflen, int verbose)
+{
+ struct eap_tls_data *data = priv;
+ return eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
+}
+
+
+static Boolean eap_tls_isKeyAvailable(struct eap_sm *sm, void *priv)
+{
+ struct eap_tls_data *data = priv;
+ return data->key_data != NULL;
+}
+
+
+static u8 * eap_tls_getKey(struct eap_sm *sm, void *priv, size_t *len)
+{
+ struct eap_tls_data *data = priv;
+ u8 *key;
+
+ if (data->key_data == NULL)
+ return NULL;
+
+ key = os_malloc(EAP_TLS_KEY_LEN);
+ if (key == NULL)
+ return NULL;
+
+ *len = EAP_TLS_KEY_LEN;
+ os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
+
+ return key;
+}
+
+
+static u8 * eap_tls_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
+{
+ struct eap_tls_data *data = priv;
+ u8 *key;
+
+ if (data->key_data == NULL)
+ return NULL;
+
+ key = os_malloc(EAP_EMSK_LEN);
+ if (key == NULL)
+ return NULL;
+
+ *len = EAP_EMSK_LEN;
+ os_memcpy(key, data->key_data + EAP_TLS_KEY_LEN, EAP_EMSK_LEN);
+
+ return key;
+}
+
+
+int eap_peer_tls_register(void)
+{
+ struct eap_method *eap;
+ int ret;
+
+ eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
+ EAP_VENDOR_IETF, EAP_TYPE_TLS, "TLS");
+ if (eap == NULL)
+ return -1;
+
+ eap->init = eap_tls_init;
+ eap->deinit = eap_tls_deinit;
+ eap->process = eap_tls_process;
+ eap->isKeyAvailable = eap_tls_isKeyAvailable;
+ eap->getKey = eap_tls_getKey;
+ eap->get_status = eap_tls_get_status;
+ eap->has_reauth_data = eap_tls_has_reauth_data;
+ eap->deinit_for_reauth = eap_tls_deinit_for_reauth;
+ eap->init_for_reauth = eap_tls_init_for_reauth;
+ eap->get_emsk = eap_tls_get_emsk;
+
+ ret = eap_peer_method_register(eap);
+ if (ret)
+ eap_peer_method_free(eap);
+ return ret;
+}
projects / mech_eap.git / blobdiff