c2ecfd936e
Approved by: re (hrs)
254 lines
5.6 KiB
C
254 lines
5.6 KiB
C
/*
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* hostapd / EAP-TLS (RFC 2716)
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* Copyright (c) 2004-2005, Jouni Malinen <jkmaline@cc.hut.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 <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <netinet/in.h>
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#include "hostapd.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 "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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};
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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 = malloc(sizeof(*data));
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if (data == NULL)
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return data;
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memset(data, 0, sizeof(*data));
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data->state = START;
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if (eap_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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return data;
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}
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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_tls_ssl_deinit(sm, &data->ssl);
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free(data);
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}
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static u8 * eap_tls_build_start(struct eap_sm *sm, struct eap_tls_data *data,
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int id, size_t *reqDataLen)
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{
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struct eap_hdr *req;
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u8 *pos;
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*reqDataLen = sizeof(*req) + 2;
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req = malloc(*reqDataLen);
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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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data->state = FAILURE;
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return NULL;
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}
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req->code = EAP_CODE_REQUEST;
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req->identifier = id;
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req->length = htons(*reqDataLen);
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pos = (u8 *) (req + 1);
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*pos++ = EAP_TYPE_TLS;
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*pos = EAP_TLS_FLAGS_START;
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data->state = CONTINUE;
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return (u8 *) req;
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}
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static u8 * eap_tls_build_req(struct eap_sm *sm, struct eap_tls_data *data,
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int id, size_t *reqDataLen)
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{
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int res;
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u8 *req;
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res = eap_tls_buildReq_helper(sm, &data->ssl, EAP_TYPE_TLS, 0, id,
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&req, reqDataLen);
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if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
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wpa_printf(MSG_DEBUG, "EAP-TLS: Done");
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data->state = SUCCESS;
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}
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if (res == 1)
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return eap_tls_build_ack(reqDataLen, id, EAP_TYPE_TLS, 0);
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return req;
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}
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static u8 * eap_tls_buildReq(struct eap_sm *sm, void *priv, int id,
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size_t *reqDataLen)
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{
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struct eap_tls_data *data = priv;
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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, reqDataLen);
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case CONTINUE:
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return eap_tls_build_req(sm, data, id, reqDataLen);
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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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}
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static Boolean eap_tls_check(struct eap_sm *sm, void *priv,
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u8 *respData, size_t respDataLen)
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{
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struct eap_hdr *resp;
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u8 *pos;
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size_t len;
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resp = (struct eap_hdr *) respData;
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pos = (u8 *) (resp + 1);
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if (respDataLen < sizeof(*resp) + 2 || *pos != EAP_TYPE_TLS ||
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(len = ntohs(resp->length)) > respDataLen) {
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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(struct eap_sm *sm, void *priv,
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u8 *respData, size_t respDataLen)
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{
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struct eap_tls_data *data = priv;
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struct eap_hdr *resp;
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u8 *pos, flags;
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int left;
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unsigned int tls_msg_len;
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resp = (struct eap_hdr *) respData;
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pos = (u8 *) (resp + 1);
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pos++;
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flags = *pos++;
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left = htons(resp->length) - sizeof(struct eap_hdr) - 2;
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wpa_printf(MSG_DEBUG, "EAP-TLS: Received packet(len=%lu) - "
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"Flags 0x%02x", (unsigned long) respDataLen, flags);
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if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) {
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if (left < 4) {
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wpa_printf(MSG_INFO, "EAP-TLS: Short frame with TLS "
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"length");
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data->state = FAILURE;
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return;
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}
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tls_msg_len = (pos[0] << 24) | (pos[1] << 16) | (pos[2] << 8) |
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pos[3];
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wpa_printf(MSG_DEBUG, "EAP-TLS: TLS Message Length: %d",
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tls_msg_len);
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if (data->ssl.tls_in_left == 0) {
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data->ssl.tls_in_total = tls_msg_len;
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data->ssl.tls_in_left = tls_msg_len;
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free(data->ssl.tls_in);
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data->ssl.tls_in = NULL;
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data->ssl.tls_in_len = 0;
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}
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pos += 4;
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left -= 4;
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}
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if (eap_tls_process_helper(sm, &data->ssl, pos, left) < 0) {
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wpa_printf(MSG_INFO, "EAP-TLS: TLS processing failed");
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data->state = FAILURE;
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return;
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}
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if (tls_connection_get_write_alerts(sm->ssl_ctx, data->ssl.conn) > 1) {
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wpa_printf(MSG_INFO, "EAP-TLS: Locally detected fatal error "
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"in TLS processing");
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data->state = FAILURE;
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return;
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}
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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_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 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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const struct eap_method eap_method_tls =
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{
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.method = EAP_TYPE_TLS,
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.name = "TLS",
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.init = eap_tls_init,
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.reset = eap_tls_reset,
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.buildReq = eap_tls_buildReq,
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.check = eap_tls_check,
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.process = eap_tls_process,
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.isDone = eap_tls_isDone,
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.getKey = eap_tls_getKey,
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.isSuccess = eap_tls_isSuccess,
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};
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