584 lines
15 KiB
C
584 lines
15 KiB
C
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/*
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* EAP peer method: EAP-GPSK (draft-ietf-emu-eap-gpsk-03.txt)
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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_i.h"
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#include "config_ssid.h"
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#include "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_client[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 session_id;
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int session_id_set;
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u8 *id_client;
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size_t id_client_len;
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u8 *id_server;
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size_t id_server_len;
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int vendor; /* CSuite/Specifier */
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int specifier; /* CSuite/Specifier */
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u8 *psk;
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size_t psk_len;
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};
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#ifndef CONFIG_NO_STDOUT_DEBUG
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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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#endif /* CONFIG_NO_STDOUT_DEBUG */
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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_deinit(struct eap_sm *sm, void *priv);
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static void * eap_gpsk_init(struct eap_sm *sm)
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{
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struct wpa_ssid *config = eap_get_config(sm);
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struct eap_gpsk_data *data;
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if (config == NULL) {
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wpa_printf(MSG_INFO, "EAP-GPSK: No configuration found");
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return NULL;
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}
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if (config->eappsk == NULL) {
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wpa_printf(MSG_INFO, "EAP-GPSK: No key (eappsk) configured");
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return NULL;
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}
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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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if (config->nai) {
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data->id_client = os_malloc(config->nai_len);
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if (data->id_client == NULL) {
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eap_gpsk_deinit(sm, data);
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return NULL;
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}
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os_memcpy(data->id_client, config->nai, config->nai_len);
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data->id_client_len = config->nai_len;
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}
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data->psk = os_malloc(config->eappsk_len);
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if (data->psk == NULL) {
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eap_gpsk_deinit(sm, data);
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return NULL;
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}
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os_memcpy(data->psk, config->eappsk, config->eappsk_len);
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data->psk_len = config->eappsk_len;
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return data;
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}
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static void eap_gpsk_deinit(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_client);
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os_free(data->psk);
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os_free(data);
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}
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static u8 * eap_gpsk_process_gpsk_1(struct eap_sm *sm,
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struct eap_gpsk_data *data,
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struct eap_method_ret *ret,
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const u8 *reqData, size_t reqDataLen,
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const u8 *payload, size_t payload_len,
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size_t *respDataLen)
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{
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size_t len, csuite_list_len, miclen;
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struct eap_hdr *resp;
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u8 *rpos, *start;
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const u8 *csuite_list, *pos, *end;
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const struct eap_hdr *req;
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struct eap_gpsk_csuite *csuite;
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u16 alen;
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int i, count;
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if (data->state != GPSK_1) {
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ret->ignore = TRUE;
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return NULL;
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}
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Received Request/GPSK-1");
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req = (const struct eap_hdr *) reqData;
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pos = payload;
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end = payload + payload_len;
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if (end - pos < 2) {
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short GPSK-1 packet");
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return NULL;
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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: ID_Server overflow");
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return NULL;
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}
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os_free(data->id_server);
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data->id_server = os_malloc(alen);
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if (data->id_server == NULL) {
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wpa_printf(MSG_DEBUG, "EAP-GPSK: No memory for ID_Server");
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return NULL;
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}
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os_memcpy(data->id_server, pos, alen);
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data->id_server_len = alen;
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wpa_hexdump_ascii(MSG_DEBUG, "EAP-GPSK: ID_Server",
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data->id_server, data->id_server_len);
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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: RAND_Server overflow");
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return NULL;
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}
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os_memcpy(data->rand_server, pos, EAP_GPSK_RAND_LEN);
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wpa_hexdump(MSG_DEBUG, "EAP-GPSK: RAND_Server",
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data->rand_server, EAP_GPSK_RAND_LEN);
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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 GPSK-1 packet");
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return NULL;
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}
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csuite_list_len = WPA_GET_BE16(pos);
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pos += 2;
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if (end - pos < (int) csuite_list_len) {
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wpa_printf(MSG_DEBUG, "EAP-GPSK: CSuite_List overflow");
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return NULL;
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}
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csuite_list = pos;
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if (csuite_list_len == 0 ||
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csuite_list_len % sizeof(struct eap_gpsk_csuite)) {
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Invalid CSuite_List len %d",
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csuite_list_len);
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return NULL;
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}
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count = csuite_list_len / sizeof(struct eap_gpsk_csuite);
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data->vendor = EAP_GPSK_VENDOR_IETF;
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data->specifier = EAP_GPSK_CIPHER_RESERVED;
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csuite = (struct eap_gpsk_csuite *) csuite_list;
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for (i = 0; i < count; i++) {
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int vendor, specifier;
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vendor = WPA_GET_BE24(csuite->vendor);
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specifier = WPA_GET_BE24(csuite->specifier);
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wpa_printf(MSG_DEBUG, "EAP-GPSK: CSuite[%d]: %d:%d",
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i, vendor, specifier);
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if (data->vendor == EAP_GPSK_VENDOR_IETF &&
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data->specifier == EAP_GPSK_CIPHER_RESERVED &&
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eap_gpsk_supported_ciphersuite(vendor, specifier)) {
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data->vendor = vendor;
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data->specifier = specifier;
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}
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csuite++;
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}
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if (data->vendor == EAP_GPSK_VENDOR_IETF &&
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data->specifier == EAP_GPSK_CIPHER_RESERVED) {
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wpa_msg(sm->msg_ctx, MSG_INFO, "EAP-GPSK: No supported "
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"ciphersuite found");
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eap_gpsk_state(data, FAILURE);
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return NULL;
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}
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Selected ciphersuite %d:%d",
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data->vendor, data->specifier);
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Sending Response/GPSK-2");
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miclen = eap_gpsk_mic_len(data->vendor, data->specifier);
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len = 1 + 2 + data->id_client_len + 2 + data->id_server_len +
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2 * EAP_GPSK_RAND_LEN + 2 + csuite_list_len +
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sizeof(struct eap_gpsk_csuite) + 2 + miclen;
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resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_GPSK, respDataLen, len,
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EAP_CODE_RESPONSE, req->identifier, &rpos);
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if (resp == NULL)
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return NULL;
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*rpos++ = EAP_GPSK_OPCODE_GPSK_2;
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start = rpos;
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wpa_hexdump_ascii(MSG_DEBUG, "EAP-GPSK: ID_Client",
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data->id_client, data->id_client_len);
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WPA_PUT_BE16(rpos, data->id_client_len);
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rpos += 2;
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if (data->id_client)
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os_memcpy(rpos, data->id_client, data->id_client_len);
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rpos += data->id_client_len;
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WPA_PUT_BE16(rpos, data->id_server_len);
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rpos += 2;
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if (data->id_server)
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os_memcpy(rpos, data->id_server, data->id_server_len);
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rpos += data->id_server_len;
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if (os_get_random(data->rand_client, EAP_GPSK_RAND_LEN)) {
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Failed to get random data "
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"for RAND_Client");
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eap_gpsk_state(data, FAILURE);
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os_free(resp);
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return NULL;
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}
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wpa_hexdump(MSG_DEBUG, "EAP-GPSK: RAND_Client",
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data->rand_client, EAP_GPSK_RAND_LEN);
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os_memcpy(rpos, data->rand_client, EAP_GPSK_RAND_LEN);
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rpos += EAP_GPSK_RAND_LEN;
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os_memcpy(rpos, data->rand_server, EAP_GPSK_RAND_LEN);
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rpos += EAP_GPSK_RAND_LEN;
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WPA_PUT_BE16(rpos, csuite_list_len);
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rpos += 2;
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os_memcpy(rpos, csuite_list, csuite_list_len);
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rpos += csuite_list_len;
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csuite = (struct eap_gpsk_csuite *) rpos;
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WPA_PUT_BE24(csuite->vendor, data->vendor);
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WPA_PUT_BE24(csuite->specifier, data->specifier);
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rpos = (u8 *) (csuite + 1);
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if (eap_gpsk_derive_keys(data->psk, data->psk_len,
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data->vendor, data->specifier,
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data->rand_client, data->rand_server,
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data->id_client, data->id_client_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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os_free(resp);
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return NULL;
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}
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/* No PD_Payload_1 */
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WPA_PUT_BE16(rpos, 0);
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rpos += 2;
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if (eap_gpsk_compute_mic(data->sk, data->sk_len, data->vendor,
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data->specifier, start, rpos - start, rpos) <
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0) {
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eap_gpsk_state(data, FAILURE);
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os_free(resp);
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return NULL;
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}
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eap_gpsk_state(data, GPSK_3);
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return (u8 *) resp;
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}
|
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static u8 * eap_gpsk_process_gpsk_3(struct eap_sm *sm,
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struct eap_gpsk_data *data,
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struct eap_method_ret *ret,
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const u8 *reqData, size_t reqDataLen,
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const u8 *payload, size_t payload_len,
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size_t *respDataLen)
|
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{
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size_t len, miclen;
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struct eap_hdr *resp;
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u8 *rpos, *start;
|
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const struct eap_hdr *req;
|
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const u8 *pos, *end;
|
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u16 alen;
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int vendor, specifier;
|
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const struct eap_gpsk_csuite *csuite;
|
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u8 mic[EAP_GPSK_MAX_MIC_LEN];
|
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|
|
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if (data->state != GPSK_3) {
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ret->ignore = TRUE;
|
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return NULL;
|
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|
}
|
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|
|
||
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Received Request/GPSK-3");
|
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|
|
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req = (const struct eap_hdr *) reqData;
|
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pos = payload;
|
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end = payload + payload_len;
|
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|
|
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if (end - pos < EAP_GPSK_RAND_LEN) {
|
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wpa_printf(MSG_DEBUG, "EAP-GPSK: Message too short for "
|
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"RAND_Client");
|
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return NULL;
|
||
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}
|
||
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if (os_memcmp(pos, data->rand_client, EAP_GPSK_RAND_LEN) != 0) {
|
||
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wpa_printf(MSG_DEBUG, "EAP-GPSK: RAND_Client in GPSK-2 and "
|
||
|
"GPSK-3 did not match");
|
||
|
wpa_hexdump(MSG_DEBUG, "EAP-GPSK: RAND_Client in GPSK-2",
|
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data->rand_client, EAP_GPSK_RAND_LEN);
|
||
|
wpa_hexdump(MSG_DEBUG, "EAP-GPSK: RAND_Client in GPSK-3",
|
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pos, EAP_GPSK_RAND_LEN);
|
||
|
eap_gpsk_state(data, FAILURE);
|
||
|
return NULL;
|
||
|
}
|
||
|
pos += EAP_GPSK_RAND_LEN;
|
||
|
|
||
|
if (end - pos < EAP_GPSK_RAND_LEN) {
|
||
|
wpa_printf(MSG_DEBUG, "EAP-GPSK: Message too short for "
|
||
|
"RAND_Server");
|
||
|
return NULL;
|
||
|
}
|
||
|
if (os_memcmp(pos, data->rand_server, EAP_GPSK_RAND_LEN) != 0) {
|
||
|
wpa_printf(MSG_DEBUG, "EAP-GPSK: RAND_Server in GPSK-1 and "
|
||
|
"GPSK-3 did not match");
|
||
|
wpa_hexdump(MSG_DEBUG, "EAP-GPSK: RAND_Server in GPSK-1",
|
||
|
data->rand_server, EAP_GPSK_RAND_LEN);
|
||
|
wpa_hexdump(MSG_DEBUG, "EAP-GPSK: RAND_Server in GPSK-3",
|
||
|
pos, EAP_GPSK_RAND_LEN);
|
||
|
eap_gpsk_state(data, FAILURE);
|
||
|
return NULL;
|
||
|
}
|
||
|
pos += EAP_GPSK_RAND_LEN;
|
||
|
|
||
|
if (end - pos < (int) sizeof(*csuite)) {
|
||
|
wpa_printf(MSG_DEBUG, "EAP-GPSK: Message too short for "
|
||
|
"CSuite_Sel");
|
||
|
return NULL;
|
||
|
}
|
||
|
csuite = (const struct eap_gpsk_csuite *) pos;
|
||
|
vendor = WPA_GET_BE24(csuite->vendor);
|
||
|
specifier = WPA_GET_BE24(csuite->specifier);
|
||
|
pos += sizeof(*csuite);
|
||
|
if (vendor != data->vendor || specifier != data->specifier) {
|
||
|
wpa_printf(MSG_DEBUG, "EAP-GPSK: CSuite_Sel (%d:%d) does not "
|
||
|
"match with the one sent in GPSK-2 (%d:%d)",
|
||
|
vendor, specifier, data->vendor, data->specifier);
|
||
|
eap_gpsk_state(data, FAILURE);
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
if (end - pos < 2) {
|
||
|
wpa_printf(MSG_DEBUG, "EAP-GPSK: Message too short for "
|
||
|
"PD_Payload_2 length");
|
||
|
eap_gpsk_state(data, FAILURE);
|
||
|
return NULL;
|
||
|
}
|
||
|
alen = WPA_GET_BE16(pos);
|
||
|
pos += 2;
|
||
|
if (end - pos < alen) {
|
||
|
wpa_printf(MSG_DEBUG, "EAP-GPSK: Message too short for "
|
||
|
"%d-octet PD_Payload_2", alen);
|
||
|
eap_gpsk_state(data, FAILURE);
|
||
|
return NULL;
|
||
|
}
|
||
|
wpa_hexdump(MSG_DEBUG, "EAP-GPSK: PD_Payload_2", 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=%d miclen=%d)", end - pos, miclen);
|
||
|
eap_gpsk_state(data, FAILURE);
|
||
|
return NULL;
|
||
|
}
|
||
|
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 NULL;
|
||
|
}
|
||
|
if (os_memcmp(mic, pos, miclen) != 0) {
|
||
|
wpa_printf(MSG_INFO, "EAP-GPSK: Incorrect MIC in GPSK-3");
|
||
|
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 NULL;
|
||
|
}
|
||
|
pos += miclen;
|
||
|
|
||
|
if (pos != end) {
|
||
|
wpa_printf(MSG_DEBUG, "EAP-GPSK: Ignored %d bytes of extra "
|
||
|
"data in the end of GPSK-2", end - pos);
|
||
|
}
|
||
|
|
||
|
wpa_printf(MSG_DEBUG, "EAP-GPSK: Sending Response/GPSK-4");
|
||
|
|
||
|
len = 1 + 2 + miclen;
|
||
|
|
||
|
resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_GPSK, respDataLen, len,
|
||
|
EAP_CODE_RESPONSE, req->identifier, &rpos);
|
||
|
if (resp == NULL)
|
||
|
return NULL;
|
||
|
|
||
|
*rpos++ = EAP_GPSK_OPCODE_GPSK_4;
|
||
|
start = rpos;
|
||
|
|
||
|
/* No PD_Payload_3 */
|
||
|
WPA_PUT_BE16(rpos, 0);
|
||
|
rpos += 2;
|
||
|
|
||
|
if (eap_gpsk_compute_mic(data->sk, data->sk_len, data->vendor,
|
||
|
data->specifier, start, rpos - start, rpos) <
|
||
|
0) {
|
||
|
eap_gpsk_state(data, FAILURE);
|
||
|
os_free(resp);
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
eap_gpsk_state(data, SUCCESS);
|
||
|
ret->methodState = METHOD_DONE;
|
||
|
ret->decision = DECISION_UNCOND_SUCC;
|
||
|
|
||
|
return (u8 *) resp;
|
||
|
}
|
||
|
|
||
|
|
||
|
static u8 * eap_gpsk_process(struct eap_sm *sm, void *priv,
|
||
|
struct eap_method_ret *ret,
|
||
|
const u8 *reqData, size_t reqDataLen,
|
||
|
size_t *respDataLen)
|
||
|
{
|
||
|
struct eap_gpsk_data *data = priv;
|
||
|
u8 *resp;
|
||
|
const u8 *pos;
|
||
|
size_t len;
|
||
|
|
||
|
pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_GPSK,
|
||
|
reqData, reqDataLen, &len);
|
||
|
if (pos == NULL || len < 1) {
|
||
|
ret->ignore = TRUE;
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
wpa_printf(MSG_DEBUG, "EAP-GPSK: Received frame: opcode %d", *pos);
|
||
|
|
||
|
ret->ignore = FALSE;
|
||
|
ret->methodState = METHOD_MAY_CONT;
|
||
|
ret->decision = DECISION_FAIL;
|
||
|
ret->allowNotifications = FALSE;
|
||
|
|
||
|
switch (*pos) {
|
||
|
case EAP_GPSK_OPCODE_GPSK_1:
|
||
|
resp = eap_gpsk_process_gpsk_1(sm, data, ret, reqData,
|
||
|
reqDataLen, pos + 1, len - 1,
|
||
|
respDataLen);
|
||
|
break;
|
||
|
case EAP_GPSK_OPCODE_GPSK_3:
|
||
|
resp = eap_gpsk_process_gpsk_3(sm, data, ret, reqData,
|
||
|
reqDataLen, pos + 1, len - 1,
|
||
|
respDataLen);
|
||
|
break;
|
||
|
default:
|
||
|
wpa_printf(MSG_DEBUG, "EAP-GPSK: Ignoring message with "
|
||
|
"unknown opcode %d", *pos);
|
||
|
ret->ignore = TRUE;
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
return resp;
|
||
|
}
|
||
|
|
||
|
|
||
|
static Boolean eap_gpsk_isKeyAvailable(struct eap_sm *sm, void *priv)
|
||
|
{
|
||
|
struct eap_gpsk_data *data = priv;
|
||
|
return data->state == SUCCESS;
|
||
|
}
|
||
|
|
||
|
|
||
|
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;
|
||
|
}
|
||
|
|
||
|
|
||
|
int eap_peer_gpsk_register(void)
|
||
|
{
|
||
|
struct eap_method *eap;
|
||
|
int ret;
|
||
|
|
||
|
eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
|
||
|
EAP_VENDOR_IETF, EAP_TYPE_GPSK, "GPSK");
|
||
|
if (eap == NULL)
|
||
|
return -1;
|
||
|
|
||
|
eap->init = eap_gpsk_init;
|
||
|
eap->deinit = eap_gpsk_deinit;
|
||
|
eap->process = eap_gpsk_process;
|
||
|
eap->isKeyAvailable = eap_gpsk_isKeyAvailable;
|
||
|
eap->getKey = eap_gpsk_getKey;
|
||
|
eap->get_emsk = eap_gpsk_get_emsk;
|
||
|
|
||
|
ret = eap_peer_method_register(eap);
|
||
|
if (ret)
|
||
|
eap_peer_method_free(eap);
|
||
|
return ret;
|
||
|
}
|