399 lines
8.7 KiB
C
399 lines
8.7 KiB
C
/*
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* hostapd / EAP-TLS (RFC 2716)
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* Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
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*
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* This software may be distributed under the terms of the BSD license.
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* See README 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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#include "eap_tls_common.h"
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#include "crypto/tls.h"
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static void eap_tls_reset(struct eap_sm *sm, void *priv);
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struct eap_tls_data {
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struct eap_ssl_data ssl;
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enum { START, CONTINUE, SUCCESS, FAILURE } state;
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int established;
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u8 eap_type;
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};
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static const char * eap_tls_state_txt(int state)
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{
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switch (state) {
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case START:
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return "START";
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case CONTINUE:
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return "CONTINUE";
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case SUCCESS:
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return "SUCCESS";
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case FAILURE:
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return "FAILURE";
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default:
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return "Unknown?!";
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}
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}
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static void eap_tls_state(struct eap_tls_data *data, int state)
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{
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wpa_printf(MSG_DEBUG, "EAP-TLS: %s -> %s",
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eap_tls_state_txt(data->state),
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eap_tls_state_txt(state));
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data->state = state;
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}
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static void * eap_tls_init(struct eap_sm *sm)
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{
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struct eap_tls_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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data->state = START;
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if (eap_server_tls_ssl_init(sm, &data->ssl, 1)) {
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wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL.");
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eap_tls_reset(sm, data);
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return NULL;
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}
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data->eap_type = EAP_TYPE_TLS;
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return data;
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}
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#ifdef EAP_SERVER_UNAUTH_TLS
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static void * eap_unauth_tls_init(struct eap_sm *sm)
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{
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struct eap_tls_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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data->state = START;
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if (eap_server_tls_ssl_init(sm, &data->ssl, 0)) {
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wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL.");
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eap_tls_reset(sm, data);
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return NULL;
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}
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data->eap_type = EAP_UNAUTH_TLS_TYPE;
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return data;
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}
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#endif /* EAP_SERVER_UNAUTH_TLS */
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#ifdef CONFIG_HS20
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static void * eap_wfa_unauth_tls_init(struct eap_sm *sm)
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{
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struct eap_tls_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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data->state = START;
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if (eap_server_tls_ssl_init(sm, &data->ssl, 0)) {
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wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL.");
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eap_tls_reset(sm, data);
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return NULL;
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}
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data->eap_type = EAP_WFA_UNAUTH_TLS_TYPE;
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return data;
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}
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#endif /* CONFIG_HS20 */
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static void eap_tls_reset(struct eap_sm *sm, void *priv)
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{
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struct eap_tls_data *data = priv;
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if (data == NULL)
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return;
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eap_server_tls_ssl_deinit(sm, &data->ssl);
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os_free(data);
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}
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static struct wpabuf * eap_tls_build_start(struct eap_sm *sm,
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struct eap_tls_data *data, u8 id)
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{
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struct wpabuf *req;
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req = eap_tls_msg_alloc(data->eap_type, 1, EAP_CODE_REQUEST, id);
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if (req == NULL) {
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wpa_printf(MSG_ERROR, "EAP-TLS: Failed to allocate memory for "
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"request");
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eap_tls_state(data, FAILURE);
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return NULL;
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}
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wpabuf_put_u8(req, EAP_TLS_FLAGS_START);
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eap_tls_state(data, CONTINUE);
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return req;
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}
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static struct wpabuf * eap_tls_buildReq(struct eap_sm *sm, void *priv, u8 id)
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{
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struct eap_tls_data *data = priv;
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struct wpabuf *res;
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if (data->ssl.state == FRAG_ACK) {
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return eap_server_tls_build_ack(id, data->eap_type, 0);
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}
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if (data->ssl.state == WAIT_FRAG_ACK) {
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res = eap_server_tls_build_msg(&data->ssl, data->eap_type, 0,
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id);
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goto check_established;
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}
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switch (data->state) {
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case START:
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return eap_tls_build_start(sm, data, id);
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case CONTINUE:
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if (tls_connection_established(sm->ssl_ctx, data->ssl.conn))
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data->established = 1;
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break;
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default:
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wpa_printf(MSG_DEBUG, "EAP-TLS: %s - unexpected state %d",
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__func__, data->state);
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return NULL;
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}
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res = eap_server_tls_build_msg(&data->ssl, data->eap_type, 0, id);
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check_established:
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if (data->established && data->ssl.state != WAIT_FRAG_ACK) {
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/* TLS handshake has been completed and there are no more
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* fragments waiting to be sent out. */
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wpa_printf(MSG_DEBUG, "EAP-TLS: Done");
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eap_tls_state(data, SUCCESS);
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}
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return res;
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}
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static Boolean eap_tls_check(struct eap_sm *sm, void *priv,
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struct wpabuf *respData)
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{
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struct eap_tls_data *data = priv;
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const u8 *pos;
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size_t len;
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if (data->eap_type == EAP_UNAUTH_TLS_TYPE)
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pos = eap_hdr_validate(EAP_VENDOR_UNAUTH_TLS,
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EAP_VENDOR_TYPE_UNAUTH_TLS, respData,
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&len);
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else if (data->eap_type == EAP_WFA_UNAUTH_TLS_TYPE)
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pos = eap_hdr_validate(EAP_VENDOR_WFA_NEW,
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EAP_VENDOR_WFA_UNAUTH_TLS, respData,
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&len);
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else
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pos = eap_hdr_validate(EAP_VENDOR_IETF, data->eap_type,
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respData, &len);
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if (pos == NULL || len < 1) {
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wpa_printf(MSG_INFO, "EAP-TLS: Invalid frame");
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return TRUE;
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}
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return FALSE;
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}
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static void eap_tls_process_msg(struct eap_sm *sm, void *priv,
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const struct wpabuf *respData)
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{
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struct eap_tls_data *data = priv;
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if (data->state == SUCCESS && wpabuf_len(data->ssl.tls_in) == 0) {
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wpa_printf(MSG_DEBUG, "EAP-TLS: Client acknowledged final TLS "
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"handshake message");
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return;
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}
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if (eap_server_tls_phase1(sm, &data->ssl) < 0)
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eap_tls_state(data, FAILURE);
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}
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static void eap_tls_process(struct eap_sm *sm, void *priv,
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struct wpabuf *respData)
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{
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struct eap_tls_data *data = priv;
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if (eap_server_tls_process(sm, &data->ssl, respData, data,
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data->eap_type, NULL, eap_tls_process_msg) <
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0)
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eap_tls_state(data, FAILURE);
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}
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static Boolean eap_tls_isDone(struct eap_sm *sm, void *priv)
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{
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struct eap_tls_data *data = priv;
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return data->state == SUCCESS || data->state == FAILURE;
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}
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static u8 * eap_tls_getKey(struct eap_sm *sm, void *priv, size_t *len)
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{
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struct eap_tls_data *data = priv;
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u8 *eapKeyData;
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if (data->state != SUCCESS)
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return NULL;
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eapKeyData = eap_server_tls_derive_key(sm, &data->ssl,
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"client EAP encryption",
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EAP_TLS_KEY_LEN);
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if (eapKeyData) {
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*len = EAP_TLS_KEY_LEN;
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wpa_hexdump(MSG_DEBUG, "EAP-TLS: Derived key",
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eapKeyData, EAP_TLS_KEY_LEN);
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} else {
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wpa_printf(MSG_DEBUG, "EAP-TLS: Failed to derive key");
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}
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return eapKeyData;
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}
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static u8 * eap_tls_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
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{
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struct eap_tls_data *data = priv;
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u8 *eapKeyData, *emsk;
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if (data->state != SUCCESS)
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return NULL;
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eapKeyData = eap_server_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 (eapKeyData) {
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emsk = os_malloc(EAP_EMSK_LEN);
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if (emsk)
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os_memcpy(emsk, eapKeyData + EAP_TLS_KEY_LEN,
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EAP_EMSK_LEN);
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os_free(eapKeyData);
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} else
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emsk = NULL;
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if (emsk) {
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*len = EAP_EMSK_LEN;
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wpa_hexdump(MSG_DEBUG, "EAP-TLS: Derived EMSK",
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emsk, EAP_EMSK_LEN);
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} else {
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wpa_printf(MSG_DEBUG, "EAP-TLS: Failed to derive EMSK");
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}
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return emsk;
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}
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static Boolean eap_tls_isSuccess(struct eap_sm *sm, void *priv)
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{
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struct eap_tls_data *data = priv;
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return data->state == SUCCESS;
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}
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int eap_server_tls_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_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
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EAP_VENDOR_IETF, EAP_TYPE_TLS, "TLS");
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if (eap == NULL)
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return -1;
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eap->init = eap_tls_init;
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eap->reset = eap_tls_reset;
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eap->buildReq = eap_tls_buildReq;
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eap->check = eap_tls_check;
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eap->process = eap_tls_process;
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eap->isDone = eap_tls_isDone;
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eap->getKey = eap_tls_getKey;
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eap->isSuccess = eap_tls_isSuccess;
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eap->get_emsk = eap_tls_get_emsk;
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ret = eap_server_method_register(eap);
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if (ret)
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eap_server_method_free(eap);
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return ret;
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}
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#ifdef EAP_SERVER_UNAUTH_TLS
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int eap_server_unauth_tls_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_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
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EAP_VENDOR_UNAUTH_TLS,
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EAP_VENDOR_TYPE_UNAUTH_TLS,
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"UNAUTH-TLS");
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if (eap == NULL)
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return -1;
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eap->init = eap_unauth_tls_init;
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eap->reset = eap_tls_reset;
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eap->buildReq = eap_tls_buildReq;
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eap->check = eap_tls_check;
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eap->process = eap_tls_process;
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eap->isDone = eap_tls_isDone;
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eap->getKey = eap_tls_getKey;
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eap->isSuccess = eap_tls_isSuccess;
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eap->get_emsk = eap_tls_get_emsk;
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ret = eap_server_method_register(eap);
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if (ret)
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eap_server_method_free(eap);
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return ret;
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}
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#endif /* EAP_SERVER_UNAUTH_TLS */
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#ifdef CONFIG_HS20
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int eap_server_wfa_unauth_tls_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_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
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EAP_VENDOR_WFA_NEW,
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EAP_VENDOR_WFA_UNAUTH_TLS,
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"WFA-UNAUTH-TLS");
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if (eap == NULL)
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return -1;
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eap->init = eap_wfa_unauth_tls_init;
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eap->reset = eap_tls_reset;
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eap->buildReq = eap_tls_buildReq;
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eap->check = eap_tls_check;
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eap->process = eap_tls_process;
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eap->isDone = eap_tls_isDone;
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eap->getKey = eap_tls_getKey;
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eap->isSuccess = eap_tls_isSuccess;
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eap->get_emsk = eap_tls_get_emsk;
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ret = eap_server_method_register(eap);
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if (ret)
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eap_server_method_free(eap);
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return ret;
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}
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#endif /* CONFIG_HS20 */
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