mirror of
https://github.com/vanhoefm/fragattacks.git
synced 2024-11-26 09:18:24 -05:00
94d9bfd59b
This makes it easier to build both EAP peer and server functionality into the same project with some toolchains.
634 lines
16 KiB
C
634 lines
16 KiB
C
/*
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* hostapd / EAP-GPSK (RFC 5433) server
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* Copyright (c) 2006-2007, 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_server/eap_i.h"
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#include "eap_common/eap_gpsk_common.h"
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struct eap_gpsk_data {
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enum { GPSK_1, GPSK_3, SUCCESS, FAILURE } state;
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u8 rand_server[EAP_GPSK_RAND_LEN];
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u8 rand_peer[EAP_GPSK_RAND_LEN];
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u8 msk[EAP_MSK_LEN];
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u8 emsk[EAP_EMSK_LEN];
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u8 sk[EAP_GPSK_MAX_SK_LEN];
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size_t sk_len;
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u8 pk[EAP_GPSK_MAX_PK_LEN];
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size_t pk_len;
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u8 *id_peer;
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size_t id_peer_len;
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u8 *id_server;
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size_t id_server_len;
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#define MAX_NUM_CSUITES 2
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struct eap_gpsk_csuite csuite_list[MAX_NUM_CSUITES];
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size_t csuite_count;
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int vendor; /* CSuite/Vendor */
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int specifier; /* CSuite/Specifier */
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};
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static const char * eap_gpsk_state_txt(int state)
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{
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switch (state) {
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case GPSK_1:
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return "GPSK-1";
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case GPSK_3:
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return "GPSK-3";
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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 "?";
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}
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}
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static void eap_gpsk_state(struct eap_gpsk_data *data, int state)
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{
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wpa_printf(MSG_DEBUG, "EAP-GPSK: %s -> %s",
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eap_gpsk_state_txt(data->state),
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eap_gpsk_state_txt(state));
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data->state = state;
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}
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static void * eap_gpsk_init(struct eap_sm *sm)
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{
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struct eap_gpsk_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 = GPSK_1;
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/* TODO: add support for configuring ID_Server */
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data->id_server = (u8 *) os_strdup("hostapd");
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if (data->id_server)
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data->id_server_len = os_strlen((char *) data->id_server);
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data->csuite_count = 0;
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if (eap_gpsk_supported_ciphersuite(EAP_GPSK_VENDOR_IETF,
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EAP_GPSK_CIPHER_AES)) {
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WPA_PUT_BE32(data->csuite_list[data->csuite_count].vendor,
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EAP_GPSK_VENDOR_IETF);
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WPA_PUT_BE16(data->csuite_list[data->csuite_count].specifier,
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EAP_GPSK_CIPHER_AES);
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data->csuite_count++;
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}
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if (eap_gpsk_supported_ciphersuite(EAP_GPSK_VENDOR_IETF,
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EAP_GPSK_CIPHER_SHA256)) {
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WPA_PUT_BE32(data->csuite_list[data->csuite_count].vendor,
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EAP_GPSK_VENDOR_IETF);
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WPA_PUT_BE16(data->csuite_list[data->csuite_count].specifier,
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EAP_GPSK_CIPHER_SHA256);
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data->csuite_count++;
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}
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return data;
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}
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static void eap_gpsk_reset(struct eap_sm *sm, void *priv)
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{
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struct eap_gpsk_data *data = priv;
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os_free(data->id_server);
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os_free(data->id_peer);
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os_free(data);
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}
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static struct wpabuf * eap_gpsk_build_gpsk_1(struct eap_sm *sm,
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struct eap_gpsk_data *data, u8 id)
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{
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size_t len;
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struct wpabuf *req;
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Request/GPSK-1");
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if (os_get_random(data->rand_server, EAP_GPSK_RAND_LEN)) {
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wpa_printf(MSG_ERROR, "EAP-GPSK: Failed to get random data");
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eap_gpsk_state(data, FAILURE);
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return NULL;
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}
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wpa_hexdump(MSG_MSGDUMP, "EAP-GPSK: RAND_Server",
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data->rand_server, EAP_GPSK_RAND_LEN);
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len = 1 + 2 + data->id_server_len + EAP_GPSK_RAND_LEN + 2 +
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data->csuite_count * sizeof(struct eap_gpsk_csuite);
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req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_GPSK, len,
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EAP_CODE_REQUEST, id);
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if (req == NULL) {
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wpa_printf(MSG_ERROR, "EAP-GPSK: Failed to allocate memory "
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"for request/GPSK-1");
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eap_gpsk_state(data, FAILURE);
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return NULL;
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}
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wpabuf_put_u8(req, EAP_GPSK_OPCODE_GPSK_1);
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wpabuf_put_be16(req, data->id_server_len);
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wpabuf_put_data(req, data->id_server, data->id_server_len);
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wpabuf_put_data(req, data->rand_server, EAP_GPSK_RAND_LEN);
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wpabuf_put_be16(req,
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data->csuite_count * sizeof(struct eap_gpsk_csuite));
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wpabuf_put_data(req, data->csuite_list,
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data->csuite_count * sizeof(struct eap_gpsk_csuite));
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return req;
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}
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static struct wpabuf * eap_gpsk_build_gpsk_3(struct eap_sm *sm,
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struct eap_gpsk_data *data, u8 id)
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{
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u8 *pos, *start;
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size_t len, miclen;
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struct eap_gpsk_csuite *csuite;
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struct wpabuf *req;
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Request/GPSK-3");
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miclen = eap_gpsk_mic_len(data->vendor, data->specifier);
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len = 1 + 2 * EAP_GPSK_RAND_LEN + 2 + data->id_server_len +
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sizeof(struct eap_gpsk_csuite) + 2 + miclen;
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req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_GPSK, len,
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EAP_CODE_REQUEST, id);
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if (req == NULL) {
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wpa_printf(MSG_ERROR, "EAP-GPSK: Failed to allocate memory "
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"for request/GPSK-3");
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eap_gpsk_state(data, FAILURE);
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return NULL;
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}
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wpabuf_put_u8(req, EAP_GPSK_OPCODE_GPSK_3);
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start = wpabuf_put(req, 0);
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wpabuf_put_data(req, data->rand_peer, EAP_GPSK_RAND_LEN);
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wpabuf_put_data(req, data->rand_server, EAP_GPSK_RAND_LEN);
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wpabuf_put_be16(req, data->id_server_len);
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wpabuf_put_data(req, data->id_server, data->id_server_len);
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csuite = wpabuf_put(req, sizeof(*csuite));
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WPA_PUT_BE32(csuite->vendor, data->vendor);
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WPA_PUT_BE16(csuite->specifier, data->specifier);
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/* no PD_Payload_2 */
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wpabuf_put_be16(req, 0);
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pos = wpabuf_put(req, miclen);
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if (eap_gpsk_compute_mic(data->sk, data->sk_len, data->vendor,
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data->specifier, start, pos - start, pos) < 0)
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{
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os_free(req);
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eap_gpsk_state(data, FAILURE);
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return NULL;
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}
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return req;
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}
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static struct wpabuf * eap_gpsk_buildReq(struct eap_sm *sm, void *priv, u8 id)
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{
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struct eap_gpsk_data *data = priv;
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switch (data->state) {
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case GPSK_1:
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return eap_gpsk_build_gpsk_1(sm, data, id);
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case GPSK_3:
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return eap_gpsk_build_gpsk_3(sm, data, id);
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default:
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Unknown state %d in buildReq",
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data->state);
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break;
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}
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return NULL;
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}
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static Boolean eap_gpsk_check(struct eap_sm *sm, void *priv,
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struct wpabuf *respData)
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{
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struct eap_gpsk_data *data = priv;
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const u8 *pos;
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size_t len;
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pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_GPSK, respData, &len);
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if (pos == NULL || len < 1) {
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wpa_printf(MSG_INFO, "EAP-GPSK: Invalid frame");
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return TRUE;
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}
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Received frame: opcode=%d", *pos);
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if (data->state == GPSK_1 && *pos == EAP_GPSK_OPCODE_GPSK_2)
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return FALSE;
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if (data->state == GPSK_3 && *pos == EAP_GPSK_OPCODE_GPSK_4)
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return FALSE;
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wpa_printf(MSG_INFO, "EAP-GPSK: Unexpected opcode=%d in state=%d",
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*pos, data->state);
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return TRUE;
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}
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static void eap_gpsk_process_gpsk_2(struct eap_sm *sm,
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struct eap_gpsk_data *data,
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const u8 *payload, size_t payloadlen)
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{
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const u8 *pos, *end;
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u16 alen;
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const struct eap_gpsk_csuite *csuite;
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size_t i, miclen;
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u8 mic[EAP_GPSK_MAX_MIC_LEN];
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if (data->state != GPSK_1)
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return;
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Received Response/GPSK-2");
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pos = payload;
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end = payload + payloadlen;
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if (end - pos < 2) {
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
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"ID_Peer length");
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eap_gpsk_state(data, FAILURE);
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return;
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}
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alen = WPA_GET_BE16(pos);
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pos += 2;
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if (end - pos < alen) {
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
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"ID_Peer");
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eap_gpsk_state(data, FAILURE);
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return;
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}
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os_free(data->id_peer);
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data->id_peer = os_malloc(alen);
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if (data->id_peer == NULL) {
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Not enough memory to store "
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"%d-octet ID_Peer", alen);
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return;
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}
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os_memcpy(data->id_peer, pos, alen);
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data->id_peer_len = alen;
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wpa_hexdump_ascii(MSG_DEBUG, "EAP-GPSK: ID_Peer",
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data->id_peer, data->id_peer_len);
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pos += alen;
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if (end - pos < 2) {
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
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"ID_Server length");
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eap_gpsk_state(data, FAILURE);
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return;
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}
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alen = WPA_GET_BE16(pos);
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pos += 2;
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if (end - pos < alen) {
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
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"ID_Server");
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eap_gpsk_state(data, FAILURE);
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return;
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}
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if (alen != data->id_server_len ||
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os_memcmp(pos, data->id_server, alen) != 0) {
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wpa_printf(MSG_DEBUG, "EAP-GPSK: ID_Server in GPSK-1 and "
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"GPSK-2 did not match");
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eap_gpsk_state(data, FAILURE);
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return;
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}
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pos += alen;
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if (end - pos < EAP_GPSK_RAND_LEN) {
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
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"RAND_Peer");
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eap_gpsk_state(data, FAILURE);
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return;
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}
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os_memcpy(data->rand_peer, pos, EAP_GPSK_RAND_LEN);
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wpa_hexdump(MSG_DEBUG, "EAP-GPSK: RAND_Peer",
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data->rand_peer, EAP_GPSK_RAND_LEN);
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pos += EAP_GPSK_RAND_LEN;
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if (end - pos < EAP_GPSK_RAND_LEN) {
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
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"RAND_Server");
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eap_gpsk_state(data, FAILURE);
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return;
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}
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if (os_memcmp(data->rand_server, pos, EAP_GPSK_RAND_LEN) != 0) {
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wpa_printf(MSG_DEBUG, "EAP-GPSK: RAND_Server in GPSK-1 and "
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"GPSK-2 did not match");
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wpa_hexdump(MSG_DEBUG, "EAP-GPSK: RAND_Server in GPSK-1",
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data->rand_server, EAP_GPSK_RAND_LEN);
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wpa_hexdump(MSG_DEBUG, "EAP-GPSK: RAND_Server in GPSK-2",
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pos, EAP_GPSK_RAND_LEN);
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eap_gpsk_state(data, FAILURE);
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return;
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}
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pos += EAP_GPSK_RAND_LEN;
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if (end - pos < 2) {
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
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"CSuite_List length");
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eap_gpsk_state(data, FAILURE);
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return;
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}
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alen = WPA_GET_BE16(pos);
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pos += 2;
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if (end - pos < alen) {
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
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"CSuite_List");
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eap_gpsk_state(data, FAILURE);
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return;
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}
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if (alen != data->csuite_count * sizeof(struct eap_gpsk_csuite) ||
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os_memcmp(pos, data->csuite_list, alen) != 0) {
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wpa_printf(MSG_DEBUG, "EAP-GPSK: CSuite_List in GPSK-1 and "
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"GPSK-2 did not match");
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eap_gpsk_state(data, FAILURE);
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return;
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}
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pos += alen;
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if (end - pos < (int) sizeof(*csuite)) {
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
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"CSuite_Sel");
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eap_gpsk_state(data, FAILURE);
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return;
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}
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csuite = (const struct eap_gpsk_csuite *) pos;
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for (i = 0; i < data->csuite_count; i++) {
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if (os_memcmp(csuite, &data->csuite_list[i], sizeof(*csuite))
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== 0)
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break;
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}
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if (i == data->csuite_count) {
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Peer selected unsupported "
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"ciphersuite %d:%d",
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WPA_GET_BE32(csuite->vendor),
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WPA_GET_BE16(csuite->specifier));
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eap_gpsk_state(data, FAILURE);
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return;
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}
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data->vendor = WPA_GET_BE32(csuite->vendor);
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data->specifier = WPA_GET_BE16(csuite->specifier);
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wpa_printf(MSG_DEBUG, "EAP-GPSK: CSuite_Sel %d:%d",
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data->vendor, data->specifier);
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pos += sizeof(*csuite);
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if (end - pos < 2) {
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
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"PD_Payload_1 length");
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eap_gpsk_state(data, FAILURE);
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return;
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}
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alen = WPA_GET_BE16(pos);
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pos += 2;
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if (end - pos < alen) {
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
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"PD_Payload_1");
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eap_gpsk_state(data, FAILURE);
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return;
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}
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wpa_hexdump(MSG_DEBUG, "EAP-GPSK: PD_Payload_1", pos, alen);
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pos += alen;
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if (sm->user == NULL || sm->user->password == NULL) {
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wpa_printf(MSG_INFO, "EAP-GPSK: No PSK/password configured "
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"for the user");
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eap_gpsk_state(data, FAILURE);
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return;
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}
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if (eap_gpsk_derive_keys(sm->user->password, sm->user->password_len,
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data->vendor, data->specifier,
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data->rand_peer, data->rand_server,
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data->id_peer, data->id_peer_len,
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data->id_server, data->id_server_len,
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data->msk, data->emsk,
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data->sk, &data->sk_len,
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data->pk, &data->pk_len) < 0) {
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Failed to derive keys");
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eap_gpsk_state(data, FAILURE);
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return;
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}
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miclen = eap_gpsk_mic_len(data->vendor, data->specifier);
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if (end - pos < (int) miclen) {
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Message too short for MIC "
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"(left=%lu miclen=%lu)",
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(unsigned long) (end - pos),
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(unsigned long) miclen);
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eap_gpsk_state(data, FAILURE);
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return;
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}
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if (eap_gpsk_compute_mic(data->sk, data->sk_len, data->vendor,
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data->specifier, payload, pos - payload, mic)
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< 0) {
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Failed to compute MIC");
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eap_gpsk_state(data, FAILURE);
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return;
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}
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|
if (os_memcmp(mic, pos, miclen) != 0) {
|
|
wpa_printf(MSG_INFO, "EAP-GPSK: Incorrect MIC in GPSK-2");
|
|
wpa_hexdump(MSG_DEBUG, "EAP-GPSK: Received MIC", pos, miclen);
|
|
wpa_hexdump(MSG_DEBUG, "EAP-GPSK: Computed MIC", mic, miclen);
|
|
eap_gpsk_state(data, FAILURE);
|
|
return;
|
|
}
|
|
pos += miclen;
|
|
|
|
if (pos != end) {
|
|
wpa_printf(MSG_DEBUG, "EAP-GPSK: Ignored %lu bytes of extra "
|
|
"data in the end of GPSK-2",
|
|
(unsigned long) (end - pos));
|
|
}
|
|
|
|
eap_gpsk_state(data, GPSK_3);
|
|
}
|
|
|
|
|
|
static void eap_gpsk_process_gpsk_4(struct eap_sm *sm,
|
|
struct eap_gpsk_data *data,
|
|
const u8 *payload, size_t payloadlen)
|
|
{
|
|
const u8 *pos, *end;
|
|
u16 alen;
|
|
size_t miclen;
|
|
u8 mic[EAP_GPSK_MAX_MIC_LEN];
|
|
|
|
if (data->state != GPSK_3)
|
|
return;
|
|
|
|
wpa_printf(MSG_DEBUG, "EAP-GPSK: Received Response/GPSK-4");
|
|
|
|
pos = payload;
|
|
end = payload + payloadlen;
|
|
|
|
if (end - pos < 2) {
|
|
wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
|
|
"PD_Payload_1 length");
|
|
eap_gpsk_state(data, FAILURE);
|
|
return;
|
|
}
|
|
alen = WPA_GET_BE16(pos);
|
|
pos += 2;
|
|
if (end - pos < alen) {
|
|
wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
|
|
"PD_Payload_1");
|
|
eap_gpsk_state(data, FAILURE);
|
|
return;
|
|
}
|
|
wpa_hexdump(MSG_DEBUG, "EAP-GPSK: PD_Payload_1", pos, alen);
|
|
pos += alen;
|
|
|
|
miclen = eap_gpsk_mic_len(data->vendor, data->specifier);
|
|
if (end - pos < (int) miclen) {
|
|
wpa_printf(MSG_DEBUG, "EAP-GPSK: Message too short for MIC "
|
|
"(left=%lu miclen=%lu)",
|
|
(unsigned long) (end - pos),
|
|
(unsigned long) miclen);
|
|
eap_gpsk_state(data, FAILURE);
|
|
return;
|
|
}
|
|
if (eap_gpsk_compute_mic(data->sk, data->sk_len, data->vendor,
|
|
data->specifier, payload, pos - payload, mic)
|
|
< 0) {
|
|
wpa_printf(MSG_DEBUG, "EAP-GPSK: Failed to compute MIC");
|
|
eap_gpsk_state(data, FAILURE);
|
|
return;
|
|
}
|
|
if (os_memcmp(mic, pos, miclen) != 0) {
|
|
wpa_printf(MSG_INFO, "EAP-GPSK: Incorrect MIC in GPSK-4");
|
|
wpa_hexdump(MSG_DEBUG, "EAP-GPSK: Received MIC", pos, miclen);
|
|
wpa_hexdump(MSG_DEBUG, "EAP-GPSK: Computed MIC", mic, miclen);
|
|
eap_gpsk_state(data, FAILURE);
|
|
return;
|
|
}
|
|
pos += miclen;
|
|
|
|
if (pos != end) {
|
|
wpa_printf(MSG_DEBUG, "EAP-GPSK: Ignored %lu bytes of extra "
|
|
"data in the end of GPSK-4",
|
|
(unsigned long) (end - pos));
|
|
}
|
|
|
|
eap_gpsk_state(data, SUCCESS);
|
|
}
|
|
|
|
|
|
static void eap_gpsk_process(struct eap_sm *sm, void *priv,
|
|
struct wpabuf *respData)
|
|
{
|
|
struct eap_gpsk_data *data = priv;
|
|
const u8 *pos;
|
|
size_t len;
|
|
|
|
pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_GPSK, respData, &len);
|
|
if (pos == NULL || len < 1)
|
|
return;
|
|
|
|
switch (*pos) {
|
|
case EAP_GPSK_OPCODE_GPSK_2:
|
|
eap_gpsk_process_gpsk_2(sm, data, pos + 1, len - 1);
|
|
break;
|
|
case EAP_GPSK_OPCODE_GPSK_4:
|
|
eap_gpsk_process_gpsk_4(sm, data, pos + 1, len - 1);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
static Boolean eap_gpsk_isDone(struct eap_sm *sm, void *priv)
|
|
{
|
|
struct eap_gpsk_data *data = priv;
|
|
return data->state == SUCCESS || data->state == FAILURE;
|
|
}
|
|
|
|
|
|
static u8 * eap_gpsk_getKey(struct eap_sm *sm, void *priv, size_t *len)
|
|
{
|
|
struct eap_gpsk_data *data = priv;
|
|
u8 *key;
|
|
|
|
if (data->state != SUCCESS)
|
|
return NULL;
|
|
|
|
key = os_malloc(EAP_MSK_LEN);
|
|
if (key == NULL)
|
|
return NULL;
|
|
os_memcpy(key, data->msk, EAP_MSK_LEN);
|
|
*len = EAP_MSK_LEN;
|
|
|
|
return key;
|
|
}
|
|
|
|
|
|
static u8 * eap_gpsk_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
|
|
{
|
|
struct eap_gpsk_data *data = priv;
|
|
u8 *key;
|
|
|
|
if (data->state != SUCCESS)
|
|
return NULL;
|
|
|
|
key = os_malloc(EAP_EMSK_LEN);
|
|
if (key == NULL)
|
|
return NULL;
|
|
os_memcpy(key, data->emsk, EAP_EMSK_LEN);
|
|
*len = EAP_EMSK_LEN;
|
|
|
|
return key;
|
|
}
|
|
|
|
|
|
static Boolean eap_gpsk_isSuccess(struct eap_sm *sm, void *priv)
|
|
{
|
|
struct eap_gpsk_data *data = priv;
|
|
return data->state == SUCCESS;
|
|
}
|
|
|
|
|
|
int eap_server_gpsk_register(void)
|
|
{
|
|
struct eap_method *eap;
|
|
int ret;
|
|
|
|
eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
|
|
EAP_VENDOR_IETF, EAP_TYPE_GPSK, "GPSK");
|
|
if (eap == NULL)
|
|
return -1;
|
|
|
|
eap->init = eap_gpsk_init;
|
|
eap->reset = eap_gpsk_reset;
|
|
eap->buildReq = eap_gpsk_buildReq;
|
|
eap->check = eap_gpsk_check;
|
|
eap->process = eap_gpsk_process;
|
|
eap->isDone = eap_gpsk_isDone;
|
|
eap->getKey = eap_gpsk_getKey;
|
|
eap->isSuccess = eap_gpsk_isSuccess;
|
|
eap->get_emsk = eap_gpsk_get_emsk;
|
|
|
|
ret = eap_server_method_register(eap);
|
|
if (ret)
|
|
eap_server_method_free(eap);
|
|
return ret;
|
|
}
|