mirror of
https://github.com/vanhoefm/fragattacks.git
synced 2024-11-26 17:28:29 -05:00
eb76b7e3ff
WPS IE is now passed from hostapd association processing into EAP-WSC and WPS processing. Request Type attribute is parsed from this information and if the request is for a WLAN Manager Registrar, additional management keys are derived (to be used with UPnP).
1125 lines
27 KiB
C
1125 lines
27 KiB
C
/*
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* Wi-Fi Protected Setup - common functionality
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* Copyright (c) 2008, 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 "dh_groups.h"
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#include "sha256.h"
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#include "aes_wrap.h"
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#include "crypto.h"
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#include "wps_i.h"
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static int wps_set_attr(struct wps_parse_attr *attr, u16 type,
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const u8 *pos, u16 len)
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{
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switch (type) {
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case ATTR_VERSION:
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if (len != 1) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid Version length %u",
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len);
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return -1;
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}
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attr->version = pos;
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break;
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case ATTR_MSG_TYPE:
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if (len != 1) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type "
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"length %u", len);
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return -1;
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}
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attr->msg_type = pos;
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break;
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case ATTR_ENROLLEE_NONCE:
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if (len != WPS_NONCE_LEN) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce "
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"length %u", len);
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return -1;
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}
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attr->enrollee_nonce = pos;
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break;
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case ATTR_REGISTRAR_NONCE:
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if (len != WPS_NONCE_LEN) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid Registrar Nonce "
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"length %u", len);
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return -1;
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}
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attr->registrar_nonce = pos;
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break;
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case ATTR_UUID_E:
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if (len != WPS_UUID_LEN) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid UUID-E length %u",
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len);
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return -1;
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}
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attr->uuid_e = pos;
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break;
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case ATTR_UUID_R:
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if (len != WPS_UUID_LEN) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid UUID-R length %u",
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len);
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return -1;
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}
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attr->uuid_r = pos;
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break;
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case ATTR_AUTH_TYPE_FLAGS:
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if (len != 2) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid Authentication "
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"Type Flags length %u", len);
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return -1;
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}
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attr->auth_type_flags = pos;
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break;
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case ATTR_ENCR_TYPE_FLAGS:
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if (len != 2) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid Encryption Type "
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"Flags length %u", len);
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return -1;
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}
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attr->encr_type_flags = pos;
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break;
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case ATTR_CONN_TYPE_FLAGS:
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if (len != 1) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid Connection Type "
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"Flags length %u", len);
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return -1;
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}
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attr->conn_type_flags = pos;
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break;
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case ATTR_CONFIG_METHODS:
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if (len != 2) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid Config Methods "
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"length %u", len);
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return -1;
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}
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attr->config_methods = pos;
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break;
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case ATTR_SELECTED_REGISTRAR_CONFIG_METHODS:
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if (len != 2) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid Selected "
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"Registrar Config Methods length %u", len);
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return -1;
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}
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attr->sel_reg_config_methods = pos;
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break;
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case ATTR_PRIMARY_DEV_TYPE:
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if (len != sizeof(struct wps_dev_type)) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid Primary Device "
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"Type length %u", len);
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return -1;
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}
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attr->primary_dev_type = pos;
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break;
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case ATTR_RF_BANDS:
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if (len != 1) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid RF Bands length "
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"%u", len);
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return -1;
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}
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attr->rf_bands = pos;
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break;
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case ATTR_ASSOC_STATE:
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if (len != 2) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid Association State "
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"length %u", len);
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return -1;
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}
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attr->assoc_state = pos;
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break;
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case ATTR_CONFIG_ERROR:
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if (len != 2) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid Configuration "
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"Error length %u", len);
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return -1;
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}
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attr->config_error = pos;
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break;
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case ATTR_DEV_PASSWORD_ID:
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if (len != 2) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid Device Password "
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"ID length %u", len);
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return -1;
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}
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attr->dev_password_id = pos;
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break;
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case ATTR_OS_VERSION:
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if (len != 4) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid OS Version length "
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"%u", len);
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return -1;
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}
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attr->os_version = pos;
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break;
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case ATTR_WPS_STATE:
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if (len != 1) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid Wi-Fi Protected "
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"Setup State length %u", len);
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return -1;
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}
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attr->wps_state = pos;
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break;
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case ATTR_AUTHENTICATOR:
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if (len != WPS_AUTHENTICATOR_LEN) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid Authenticator "
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"length %u", len);
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return -1;
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}
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attr->authenticator = pos;
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break;
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case ATTR_R_HASH1:
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if (len != WPS_HASH_LEN) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid R-Hash1 length %u",
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len);
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return -1;
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}
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attr->r_hash1 = pos;
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break;
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case ATTR_R_HASH2:
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if (len != WPS_HASH_LEN) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid R-Hash2 length %u",
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len);
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return -1;
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}
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attr->r_hash2 = pos;
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break;
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case ATTR_E_HASH1:
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if (len != WPS_HASH_LEN) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid E-Hash1 length %u",
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len);
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return -1;
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}
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attr->e_hash1 = pos;
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break;
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case ATTR_E_HASH2:
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if (len != WPS_HASH_LEN) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid E-Hash2 length %u",
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len);
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return -1;
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}
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attr->e_hash2 = pos;
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break;
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case ATTR_R_SNONCE1:
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if (len != WPS_SECRET_NONCE_LEN) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid R-SNonce1 length "
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"%u", len);
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return -1;
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}
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attr->r_snonce1 = pos;
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break;
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case ATTR_R_SNONCE2:
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if (len != WPS_SECRET_NONCE_LEN) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid R-SNonce2 length "
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"%u", len);
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return -1;
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}
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attr->r_snonce2 = pos;
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break;
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case ATTR_E_SNONCE1:
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if (len != WPS_SECRET_NONCE_LEN) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid E-SNonce1 length "
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"%u", len);
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return -1;
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}
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attr->e_snonce1 = pos;
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break;
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case ATTR_E_SNONCE2:
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if (len != WPS_SECRET_NONCE_LEN) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid E-SNonce2 length "
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"%u", len);
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return -1;
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}
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attr->e_snonce2 = pos;
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break;
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case ATTR_KEY_WRAP_AUTH:
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if (len != WPS_KWA_LEN) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid Key Wrap "
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"Authenticator length %u", len);
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return -1;
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}
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attr->key_wrap_auth = pos;
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break;
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case ATTR_AUTH_TYPE:
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if (len != 2) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid Authentication "
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"Type length %u", len);
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return -1;
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}
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attr->auth_type = pos;
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break;
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case ATTR_ENCR_TYPE:
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if (len != 2) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid Encryption "
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"Type length %u", len);
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return -1;
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}
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attr->encr_type = pos;
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break;
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case ATTR_NETWORK_INDEX:
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if (len != 1) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid Network Index "
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"length %u", len);
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return -1;
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}
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attr->network_idx = pos;
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break;
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case ATTR_NETWORK_KEY_INDEX:
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if (len != 1) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid Network Key Index "
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"length %u", len);
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return -1;
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}
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attr->network_key_idx = pos;
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break;
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case ATTR_MAC_ADDR:
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if (len != ETH_ALEN) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid MAC Address "
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"length %u", len);
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return -1;
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}
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attr->mac_addr = pos;
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break;
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case ATTR_KEY_PROVIDED_AUTO:
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if (len != 1) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid Key Provided "
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"Automatically length %u", len);
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return -1;
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}
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attr->key_prov_auto = pos;
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break;
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case ATTR_802_1X_ENABLED:
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if (len != 1) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid 802.1X Enabled "
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"length %u", len);
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return -1;
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}
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attr->dot1x_enabled = pos;
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break;
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case ATTR_SELECTED_REGISTRAR:
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if (len != 1) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid Selected Registrar"
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" length %u", len);
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return -1;
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}
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attr->selected_registrar = pos;
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break;
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case ATTR_REQUEST_TYPE:
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if (len != 1) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid Request Type "
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"length %u", len);
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return -1;
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}
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attr->request_type = pos;
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break;
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case ATTR_RESPONSE_TYPE:
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if (len != 1) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid Response Type "
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"length %u", len);
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return -1;
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}
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attr->request_type = pos;
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break;
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case ATTR_MANUFACTURER:
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attr->manufacturer = pos;
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attr->manufacturer_len = len;
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break;
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case ATTR_MODEL_NAME:
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attr->model_name = pos;
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attr->model_name_len = len;
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break;
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case ATTR_MODEL_NUMBER:
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attr->model_number = pos;
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attr->model_number_len = len;
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break;
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case ATTR_SERIAL_NUMBER:
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attr->serial_number = pos;
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attr->serial_number_len = len;
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break;
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case ATTR_DEV_NAME:
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attr->dev_name = pos;
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attr->dev_name_len = len;
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break;
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case ATTR_PUBLIC_KEY:
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attr->public_key = pos;
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attr->public_key_len = len;
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break;
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case ATTR_ENCR_SETTINGS:
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attr->encr_settings = pos;
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attr->encr_settings_len = len;
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break;
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case ATTR_CRED:
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if (attr->num_cred >= MAX_CRED_COUNT) {
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wpa_printf(MSG_DEBUG, "WPS: Skipped Credential "
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"attribute (max %d credentials)",
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MAX_CRED_COUNT);
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break;
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}
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attr->cred[attr->num_cred] = pos;
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attr->cred_len[attr->num_cred] = len;
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attr->num_cred++;
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break;
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case ATTR_SSID:
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attr->ssid = pos;
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attr->ssid_len = len;
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break;
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case ATTR_NETWORK_KEY:
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attr->network_key = pos;
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attr->network_key_len = len;
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break;
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case ATTR_EAP_TYPE:
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attr->eap_type = pos;
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attr->eap_type_len = len;
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break;
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case ATTR_EAP_IDENTITY:
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attr->eap_identity = pos;
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attr->eap_identity_len = len;
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break;
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default:
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wpa_printf(MSG_DEBUG, "WPS: Unsupported attribute type 0x%x "
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"len=%u", type, len);
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break;
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}
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return 0;
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}
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int wps_parse_msg(const struct wpabuf *msg, struct wps_parse_attr *attr)
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{
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const u8 *pos, *end;
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u16 type, len;
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os_memset(attr, 0, sizeof(*attr));
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pos = wpabuf_head(msg);
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end = pos + wpabuf_len(msg);
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while (pos < end) {
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if (end - pos < 4) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid message - "
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"%lu bytes remaining",
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(unsigned long) (end - pos));
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return -1;
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}
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type = WPA_GET_BE16(pos);
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pos += 2;
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len = WPA_GET_BE16(pos);
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pos += 2;
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wpa_printf(MSG_MSGDUMP, "WPS: attr type=0x%x len=%u",
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type, len);
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if (len > end - pos) {
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wpa_printf(MSG_DEBUG, "WPS: Attribute overflow");
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return -1;
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}
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if (wps_set_attr(attr, type, pos, len) < 0)
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return -1;
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pos += len;
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}
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return 0;
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}
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void wps_kdf(const u8 *key, const u8 *label_prefix, size_t label_prefix_len,
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const char *label, u8 *res, size_t res_len)
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{
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u8 i_buf[4], key_bits[4];
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const u8 *addr[4];
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size_t len[4];
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int i, iter;
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u8 hash[SHA256_MAC_LEN], *opos;
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size_t left;
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WPA_PUT_BE32(key_bits, res_len * 8);
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addr[0] = i_buf;
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len[0] = sizeof(i_buf);
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addr[1] = label_prefix;
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len[1] = label_prefix_len;
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addr[2] = (const u8 *) label;
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len[2] = os_strlen(label);
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addr[3] = key_bits;
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len[3] = sizeof(key_bits);
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iter = (res_len + SHA256_MAC_LEN - 1) / SHA256_MAC_LEN;
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opos = res;
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left = res_len;
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for (i = 1; i <= iter; i++) {
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WPA_PUT_BE32(i_buf, i);
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hmac_sha256_vector(key, SHA256_MAC_LEN, 4, addr, len, hash);
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if (i < iter) {
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os_memcpy(opos, hash, SHA256_MAC_LEN);
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opos += SHA256_MAC_LEN;
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left -= SHA256_MAC_LEN;
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} else
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os_memcpy(opos, hash, left);
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}
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}
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int wps_build_public_key(struct wps_data *wps, struct wpabuf *msg)
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{
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struct wpabuf *pubkey;
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wpa_printf(MSG_DEBUG, "WPS: * Public Key");
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pubkey = dh_init(dh_groups_get(WPS_DH_GROUP), &wps->dh_privkey);
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if (pubkey == NULL) {
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wpa_printf(MSG_DEBUG, "WPS: Failed to initialize "
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"Diffie-Hellman handshake");
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return -1;
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}
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wpabuf_put_be16(msg, ATTR_PUBLIC_KEY);
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wpabuf_put_be16(msg, wpabuf_len(pubkey));
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wpabuf_put_buf(msg, pubkey);
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if (wps->registrar) {
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wpabuf_free(wps->dh_pubkey_r);
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wps->dh_pubkey_r = pubkey;
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} else {
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wpabuf_free(wps->dh_pubkey_e);
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wps->dh_pubkey_e = pubkey;
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}
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return 0;
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}
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int wps_derive_keys(struct wps_data *wps)
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{
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struct wpabuf *pubkey, *dh_shared;
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u8 dhkey[SHA256_MAC_LEN], kdk[SHA256_MAC_LEN];
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const u8 *addr[3];
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size_t len[3];
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u8 keys[WPS_AUTHKEY_LEN + WPS_KEYWRAPKEY_LEN + WPS_EMSK_LEN];
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if (wps->dh_privkey == NULL) {
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wpa_printf(MSG_DEBUG, "WPS: Own DH private key not available");
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return -1;
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}
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|
|
pubkey = wps->registrar ? wps->dh_pubkey_e : wps->dh_pubkey_r;
|
|
if (pubkey == NULL) {
|
|
wpa_printf(MSG_DEBUG, "WPS: Peer DH public key not available");
|
|
return -1;
|
|
}
|
|
|
|
dh_shared = dh_derive_shared(pubkey, wps->dh_privkey,
|
|
dh_groups_get(WPS_DH_GROUP));
|
|
if (dh_shared == NULL) {
|
|
wpa_printf(MSG_DEBUG, "WPS: Failed to derive DH shared key");
|
|
return -1;
|
|
}
|
|
|
|
/* Own DH private key is not needed anymore */
|
|
wpabuf_free(wps->dh_privkey);
|
|
wps->dh_privkey = NULL;
|
|
|
|
wpa_hexdump_buf_key(MSG_DEBUG, "WPS: DH shared key", dh_shared);
|
|
|
|
/* DHKey = SHA-256(g^AB mod p) */
|
|
addr[0] = wpabuf_head(dh_shared);
|
|
len[0] = wpabuf_len(dh_shared);
|
|
sha256_vector(1, addr, len, dhkey);
|
|
wpa_hexdump_key(MSG_DEBUG, "WPS: DHKey", dhkey, sizeof(dhkey));
|
|
wpabuf_free(dh_shared);
|
|
|
|
/* KDK = HMAC-SHA-256_DHKey(N1 || EnrolleeMAC || N2) */
|
|
addr[0] = wps->nonce_e;
|
|
len[0] = WPS_NONCE_LEN;
|
|
addr[1] = wps->mac_addr_e;
|
|
len[1] = ETH_ALEN;
|
|
addr[2] = wps->nonce_r;
|
|
len[2] = WPS_NONCE_LEN;
|
|
hmac_sha256_vector(dhkey, sizeof(dhkey), 3, addr, len, kdk);
|
|
wpa_hexdump_key(MSG_DEBUG, "WPS: KDK", kdk, sizeof(kdk));
|
|
|
|
wps_kdf(kdk, NULL, 0, "Wi-Fi Easy and Secure Key Derivation",
|
|
keys, sizeof(keys));
|
|
os_memcpy(wps->authkey, keys, WPS_AUTHKEY_LEN);
|
|
os_memcpy(wps->keywrapkey, keys + WPS_AUTHKEY_LEN, WPS_KEYWRAPKEY_LEN);
|
|
os_memcpy(wps->emsk, keys + WPS_AUTHKEY_LEN + WPS_KEYWRAPKEY_LEN,
|
|
WPS_EMSK_LEN);
|
|
|
|
wpa_hexdump_key(MSG_DEBUG, "WPS: AuthKey",
|
|
wps->authkey, WPS_AUTHKEY_LEN);
|
|
wpa_hexdump_key(MSG_DEBUG, "WPS: KeyWrapKey",
|
|
wps->keywrapkey, WPS_KEYWRAPKEY_LEN);
|
|
wpa_hexdump_key(MSG_DEBUG, "WPS: EMSK", wps->emsk, WPS_EMSK_LEN);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int wps_derive_mgmt_keys(struct wps_data *wps)
|
|
{
|
|
u8 nonces[2 * WPS_NONCE_LEN];
|
|
u8 keys[WPS_MGMTAUTHKEY_LEN + WPS_MGMTENCKEY_LEN];
|
|
u8 hash[SHA256_MAC_LEN];
|
|
const u8 *addr[2];
|
|
size_t len[2];
|
|
const char *auth_label = "WFA-WLAN-Management-MgmtAuthKey";
|
|
const char *enc_label = "WFA-WLAN-Management-MgmtEncKey";
|
|
|
|
/* MgmtAuthKey || MgmtEncKey =
|
|
* kdf(EMSK, N1 || N2 || "WFA-WLAN-Management-Keys", 384) */
|
|
os_memcpy(nonces, wps->nonce_e, WPS_NONCE_LEN);
|
|
os_memcpy(nonces + WPS_NONCE_LEN, wps->nonce_r, WPS_NONCE_LEN);
|
|
wps_kdf(wps->emsk, nonces, sizeof(nonces), "WFA-WLAN-Management-Keys",
|
|
keys, sizeof(keys));
|
|
os_memcpy(wps->mgmt_auth_key, keys, WPS_MGMTAUTHKEY_LEN);
|
|
os_memcpy(wps->mgmt_enc_key, keys + WPS_MGMTAUTHKEY_LEN,
|
|
WPS_MGMTENCKEY_LEN);
|
|
|
|
addr[0] = nonces;
|
|
len[0] = sizeof(nonces);
|
|
|
|
/* MgmtEncKeyID = first 128 bits of
|
|
* SHA-256(N1 || N2 || "WFA-WLAN-Management-MgmtAuthKey") */
|
|
addr[1] = (const u8 *) auth_label;
|
|
len[1] = os_strlen(auth_label);
|
|
sha256_vector(2, addr, len, hash);
|
|
os_memcpy(wps->mgmt_auth_key_id, hash, WPS_MGMT_KEY_ID_LEN);
|
|
|
|
/* MgmtEncKeyID = first 128 bits of
|
|
* SHA-256(N1 || N2 || "WFA-WLAN-Management-MgmtEncKey") */
|
|
addr[1] = (const u8 *) enc_label;
|
|
len[1] = os_strlen(enc_label);
|
|
sha256_vector(2, addr, len, hash);
|
|
os_memcpy(wps->mgmt_enc_key_id, hash, WPS_MGMT_KEY_ID_LEN);
|
|
|
|
wpa_hexdump_key(MSG_DEBUG, "WPS: MgmtAuthKey",
|
|
wps->mgmt_auth_key, WPS_MGMTAUTHKEY_LEN);
|
|
wpa_hexdump(MSG_DEBUG, "WPS: MgmtAuthKeyID",
|
|
wps->mgmt_auth_key_id, WPS_MGMT_KEY_ID_LEN);
|
|
wpa_hexdump_key(MSG_DEBUG, "WPS: MgmtEncKey",
|
|
wps->mgmt_enc_key, WPS_MGMTENCKEY_LEN);
|
|
wpa_hexdump(MSG_DEBUG, "WPS: MgmtEncKeyID",
|
|
wps->mgmt_enc_key_id, WPS_MGMT_KEY_ID_LEN);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int wps_build_authenticator(struct wps_data *wps, struct wpabuf *msg)
|
|
{
|
|
u8 hash[SHA256_MAC_LEN];
|
|
const u8 *addr[2];
|
|
size_t len[2];
|
|
|
|
if (wps->last_msg == NULL) {
|
|
wpa_printf(MSG_DEBUG, "WPS: Last message not available for "
|
|
"building authenticator");
|
|
return -1;
|
|
}
|
|
|
|
/* Authenticator = HMAC-SHA256_AuthKey(M_prev || M_curr*)
|
|
* (M_curr* is M_curr without the Authenticator attribute)
|
|
*/
|
|
addr[0] = wpabuf_head(wps->last_msg);
|
|
len[0] = wpabuf_len(wps->last_msg);
|
|
addr[1] = wpabuf_head(msg);
|
|
len[1] = wpabuf_len(msg);
|
|
hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 2, addr, len, hash);
|
|
|
|
wpa_printf(MSG_DEBUG, "WPS: * Authenticator");
|
|
wpabuf_put_be16(msg, ATTR_AUTHENTICATOR);
|
|
wpabuf_put_be16(msg, WPS_AUTHENTICATOR_LEN);
|
|
wpabuf_put_data(msg, hash, WPS_AUTHENTICATOR_LEN);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int wps_process_authenticator(struct wps_data *wps, const u8 *authenticator,
|
|
const struct wpabuf *msg)
|
|
{
|
|
u8 hash[SHA256_MAC_LEN];
|
|
const u8 *addr[2];
|
|
size_t len[2];
|
|
|
|
if (authenticator == NULL) {
|
|
wpa_printf(MSG_DEBUG, "WPS: No Authenticator attribute "
|
|
"included");
|
|
return -1;
|
|
}
|
|
|
|
if (wps->last_msg == NULL) {
|
|
wpa_printf(MSG_DEBUG, "WPS: Last message not available for "
|
|
"validating authenticator");
|
|
return -1;
|
|
}
|
|
|
|
/* Authenticator = HMAC-SHA256_AuthKey(M_prev || M_curr*)
|
|
* (M_curr* is M_curr without the Authenticator attribute)
|
|
*/
|
|
addr[0] = wpabuf_head(wps->last_msg);
|
|
len[0] = wpabuf_len(wps->last_msg);
|
|
addr[1] = wpabuf_head(msg);
|
|
len[1] = wpabuf_len(msg) - 4 - WPS_AUTHENTICATOR_LEN;
|
|
hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 2, addr, len, hash);
|
|
|
|
if (os_memcmp(hash, authenticator, WPS_AUTHENTICATOR_LEN) != 0) {
|
|
wpa_printf(MSG_DEBUG, "WPS: Incorrect Authenticator");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
void wps_derive_psk(struct wps_data *wps, const u8 *dev_passwd,
|
|
size_t dev_passwd_len)
|
|
{
|
|
u8 hash[SHA256_MAC_LEN];
|
|
|
|
hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN, dev_passwd,
|
|
(dev_passwd_len + 1) / 2, hash);
|
|
os_memcpy(wps->psk1, hash, WPS_PSK_LEN);
|
|
hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN,
|
|
dev_passwd + (dev_passwd_len + 1) / 2,
|
|
dev_passwd_len / 2, hash);
|
|
os_memcpy(wps->psk2, hash, WPS_PSK_LEN);
|
|
|
|
wpa_hexdump_ascii_key(MSG_DEBUG, "WPS: Device Password",
|
|
dev_passwd, dev_passwd_len);
|
|
wpa_hexdump_key(MSG_DEBUG, "WPS: PSK1", wps->psk1, WPS_PSK_LEN);
|
|
wpa_hexdump_key(MSG_DEBUG, "WPS: PSK2", wps->psk2, WPS_PSK_LEN);
|
|
}
|
|
|
|
|
|
struct wpabuf * wps_decrypt_encr_settings(struct wps_data *wps, const u8 *encr,
|
|
size_t encr_len)
|
|
{
|
|
struct wpabuf *decrypted;
|
|
const size_t block_size = 16;
|
|
size_t i;
|
|
u8 pad;
|
|
const u8 *pos;
|
|
|
|
/* AES-128-CBC */
|
|
if (encr == NULL || encr_len < 2 * block_size || encr_len % block_size)
|
|
{
|
|
wpa_printf(MSG_DEBUG, "WPS: No Encrypted Settings received");
|
|
return NULL;
|
|
}
|
|
|
|
decrypted = wpabuf_alloc(encr_len - block_size);
|
|
if (decrypted == NULL)
|
|
return NULL;
|
|
|
|
wpa_hexdump(MSG_MSGDUMP, "WPS: Encrypted Settings", encr, encr_len);
|
|
wpabuf_put_data(decrypted, encr + block_size, encr_len - block_size);
|
|
if (aes_128_cbc_decrypt(wps->keywrapkey, encr, wpabuf_mhead(decrypted),
|
|
wpabuf_len(decrypted))) {
|
|
wpabuf_free(decrypted);
|
|
return NULL;
|
|
}
|
|
|
|
wpa_hexdump_buf_key(MSG_MSGDUMP, "WPS: Decrypted Encrypted Settings",
|
|
decrypted);
|
|
|
|
pos = wpabuf_head_u8(decrypted) + wpabuf_len(decrypted) - 1;
|
|
pad = *pos;
|
|
if (pad > wpabuf_len(decrypted)) {
|
|
wpa_printf(MSG_DEBUG, "WPS: Invalid PKCS#5 v2.0 pad value");
|
|
wpabuf_free(decrypted);
|
|
return NULL;
|
|
}
|
|
for (i = 0; i < pad; i++) {
|
|
if (*pos-- != pad) {
|
|
wpa_printf(MSG_DEBUG, "WPS: Invalid PKCS#5 v2.0 pad "
|
|
"string");
|
|
wpabuf_free(decrypted);
|
|
return NULL;
|
|
}
|
|
}
|
|
decrypted->used -= pad;
|
|
|
|
return decrypted;
|
|
}
|
|
|
|
|
|
int wps_process_key_wrap_auth(struct wps_data *wps, struct wpabuf *msg,
|
|
const u8 *key_wrap_auth)
|
|
{
|
|
u8 hash[SHA256_MAC_LEN];
|
|
const u8 *head;
|
|
size_t len;
|
|
|
|
if (key_wrap_auth == NULL) {
|
|
wpa_printf(MSG_DEBUG, "WPS: No KWA in decrypted attribute");
|
|
return -1;
|
|
}
|
|
|
|
head = wpabuf_head(msg);
|
|
len = wpabuf_len(msg) - 4 - WPS_KWA_LEN;
|
|
if (head + len != key_wrap_auth - 4) {
|
|
wpa_printf(MSG_DEBUG, "WPS: KWA not in the end of the "
|
|
"decrypted attribute");
|
|
return -1;
|
|
}
|
|
|
|
hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN, head, len, hash);
|
|
if (os_memcmp(hash, key_wrap_auth, WPS_KWA_LEN) != 0) {
|
|
wpa_printf(MSG_DEBUG, "WPS: Invalid KWA");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int wps_build_version(struct wpabuf *msg)
|
|
{
|
|
wpa_printf(MSG_DEBUG, "WPS: * Version");
|
|
wpabuf_put_be16(msg, ATTR_VERSION);
|
|
wpabuf_put_be16(msg, 1);
|
|
wpabuf_put_u8(msg, WPS_VERSION);
|
|
return 0;
|
|
}
|
|
|
|
|
|
int wps_build_msg_type(struct wpabuf *msg, enum wps_msg_type msg_type)
|
|
{
|
|
wpa_printf(MSG_DEBUG, "WPS: * Message Type (%d)", msg_type);
|
|
wpabuf_put_be16(msg, ATTR_MSG_TYPE);
|
|
wpabuf_put_be16(msg, 1);
|
|
wpabuf_put_u8(msg, msg_type);
|
|
return 0;
|
|
}
|
|
|
|
|
|
int wps_build_enrollee_nonce(struct wps_data *wps, struct wpabuf *msg)
|
|
{
|
|
wpa_printf(MSG_DEBUG, "WPS: * Enrollee Nonce");
|
|
wpabuf_put_be16(msg, ATTR_ENROLLEE_NONCE);
|
|
wpabuf_put_be16(msg, WPS_NONCE_LEN);
|
|
wpabuf_put_data(msg, wps->nonce_e, WPS_NONCE_LEN);
|
|
return 0;
|
|
}
|
|
|
|
|
|
int wps_build_registrar_nonce(struct wps_data *wps, struct wpabuf *msg)
|
|
{
|
|
wpa_printf(MSG_DEBUG, "WPS: * Registrar Nonce");
|
|
wpabuf_put_be16(msg, ATTR_REGISTRAR_NONCE);
|
|
wpabuf_put_be16(msg, WPS_NONCE_LEN);
|
|
wpabuf_put_data(msg, wps->nonce_r, WPS_NONCE_LEN);
|
|
return 0;
|
|
}
|
|
|
|
|
|
int wps_build_auth_type_flags(struct wps_data *wps, struct wpabuf *msg)
|
|
{
|
|
wpa_printf(MSG_DEBUG, "WPS: * Authentication Type Flags");
|
|
wpabuf_put_be16(msg, ATTR_AUTH_TYPE_FLAGS);
|
|
wpabuf_put_be16(msg, 2);
|
|
wpabuf_put_be16(msg, WPS_AUTH_TYPES);
|
|
return 0;
|
|
}
|
|
|
|
|
|
int wps_build_encr_type_flags(struct wps_data *wps, struct wpabuf *msg)
|
|
{
|
|
wpa_printf(MSG_DEBUG, "WPS: * Encryption Type Flags");
|
|
wpabuf_put_be16(msg, ATTR_ENCR_TYPE_FLAGS);
|
|
wpabuf_put_be16(msg, 2);
|
|
wpabuf_put_be16(msg, WPS_ENCR_TYPES);
|
|
return 0;
|
|
}
|
|
|
|
|
|
int wps_build_conn_type_flags(struct wps_data *wps, struct wpabuf *msg)
|
|
{
|
|
wpa_printf(MSG_DEBUG, "WPS: * Connection Type Flags");
|
|
wpabuf_put_be16(msg, ATTR_CONN_TYPE_FLAGS);
|
|
wpabuf_put_be16(msg, 1);
|
|
wpabuf_put_u8(msg, WPS_CONN_ESS);
|
|
return 0;
|
|
}
|
|
|
|
|
|
int wps_build_assoc_state(struct wps_data *wps, struct wpabuf *msg)
|
|
{
|
|
wpa_printf(MSG_DEBUG, "WPS: * Association State");
|
|
wpabuf_put_be16(msg, ATTR_ASSOC_STATE);
|
|
wpabuf_put_be16(msg, 2);
|
|
wpabuf_put_be16(msg, WPS_ASSOC_NOT_ASSOC);
|
|
return 0;
|
|
}
|
|
|
|
|
|
int wps_build_key_wrap_auth(struct wps_data *wps, struct wpabuf *msg)
|
|
{
|
|
u8 hash[SHA256_MAC_LEN];
|
|
|
|
wpa_printf(MSG_DEBUG, "WPS: * Key Wrap Authenticator");
|
|
hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN, wpabuf_head(msg),
|
|
wpabuf_len(msg), hash);
|
|
|
|
wpabuf_put_be16(msg, ATTR_KEY_WRAP_AUTH);
|
|
wpabuf_put_be16(msg, WPS_KWA_LEN);
|
|
wpabuf_put_data(msg, hash, WPS_KWA_LEN);
|
|
return 0;
|
|
}
|
|
|
|
|
|
int wps_build_encr_settings(struct wps_data *wps, struct wpabuf *msg,
|
|
struct wpabuf *plain)
|
|
{
|
|
size_t pad_len;
|
|
const size_t block_size = 16;
|
|
u8 *iv, *data;
|
|
|
|
wpa_printf(MSG_DEBUG, "WPS: * Encrypted Settings");
|
|
|
|
/* PKCS#5 v2.0 pad */
|
|
pad_len = block_size - wpabuf_len(plain) % block_size;
|
|
os_memset(wpabuf_put(plain, pad_len), pad_len, pad_len);
|
|
|
|
wpabuf_put_be16(msg, ATTR_ENCR_SETTINGS);
|
|
wpabuf_put_be16(msg, block_size + wpabuf_len(plain));
|
|
|
|
iv = wpabuf_put(msg, block_size);
|
|
if (os_get_random(iv, block_size) < 0)
|
|
return -1;
|
|
|
|
data = wpabuf_put(msg, 0);
|
|
wpabuf_put_buf(msg, plain);
|
|
if (aes_128_cbc_encrypt(wps->keywrapkey, iv, data, wpabuf_len(plain)))
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int wps_process_cred_network_idx(struct wps_credential *cred,
|
|
const u8 *idx)
|
|
{
|
|
if (idx == NULL) {
|
|
wpa_printf(MSG_DEBUG, "WPS: Credential did not include "
|
|
"Network Index");
|
|
return -1;
|
|
}
|
|
|
|
wpa_printf(MSG_DEBUG, "WPS: Network Index: %d", *idx);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int wps_process_cred_ssid(struct wps_credential *cred, const u8 *ssid,
|
|
size_t ssid_len)
|
|
{
|
|
if (ssid == NULL) {
|
|
wpa_printf(MSG_DEBUG, "WPS: Credential did not include SSID");
|
|
return -1;
|
|
}
|
|
|
|
/* Remove zero-padding since some Registrar implementations seem to use
|
|
* hardcoded 32-octet length for this attribute */
|
|
while (ssid_len > 0 && ssid[ssid_len - 1] == 0)
|
|
ssid_len--;
|
|
|
|
wpa_hexdump_ascii(MSG_DEBUG, "WPS: SSID", ssid, ssid_len);
|
|
if (ssid_len <= sizeof(cred->ssid)) {
|
|
os_memcpy(cred->ssid, ssid, ssid_len);
|
|
cred->ssid_len = ssid_len;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int wps_process_cred_auth_type(struct wps_credential *cred,
|
|
const u8 *auth_type)
|
|
{
|
|
if (auth_type == NULL) {
|
|
wpa_printf(MSG_DEBUG, "WPS: Credential did not include "
|
|
"Authentication Type");
|
|
return -1;
|
|
}
|
|
|
|
cred->auth_type = WPA_GET_BE16(auth_type);
|
|
wpa_printf(MSG_DEBUG, "WPS: Authentication Type: 0x%x",
|
|
cred->auth_type);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int wps_process_cred_encr_type(struct wps_credential *cred,
|
|
const u8 *encr_type)
|
|
{
|
|
if (encr_type == NULL) {
|
|
wpa_printf(MSG_DEBUG, "WPS: Credential did not include "
|
|
"Encryption Type");
|
|
return -1;
|
|
}
|
|
|
|
cred->encr_type = WPA_GET_BE16(encr_type);
|
|
wpa_printf(MSG_DEBUG, "WPS: Encryption Type: 0x%x",
|
|
cred->encr_type);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int wps_process_cred_network_key_idx(struct wps_credential *cred,
|
|
const u8 *key_idx)
|
|
{
|
|
if (key_idx == NULL)
|
|
return 0; /* optional attribute */
|
|
|
|
wpa_printf(MSG_DEBUG, "WPS: Network Key Index: %d", *key_idx);
|
|
cred->key_idx = *key_idx;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int wps_process_cred_network_key(struct wps_credential *cred,
|
|
const u8 *key, size_t key_len)
|
|
{
|
|
if (key == NULL) {
|
|
wpa_printf(MSG_DEBUG, "WPS: Credential did not include "
|
|
"Network Key");
|
|
return -1;
|
|
}
|
|
|
|
wpa_hexdump_key(MSG_DEBUG, "WPS: Network Key", key, key_len);
|
|
if (key_len <= sizeof(cred->key)) {
|
|
os_memcpy(cred->key, key, key_len);
|
|
cred->key_len = key_len;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int wps_process_cred_mac_addr(struct wps_credential *cred,
|
|
const u8 *mac_addr)
|
|
{
|
|
if (mac_addr == NULL) {
|
|
wpa_printf(MSG_DEBUG, "WPS: Credential did not include "
|
|
"MAC Address");
|
|
return -1;
|
|
}
|
|
|
|
wpa_printf(MSG_DEBUG, "WPS: MAC Address " MACSTR, MAC2STR(mac_addr));
|
|
os_memcpy(cred->mac_addr, mac_addr, ETH_ALEN);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int wps_process_cred_eap_type(struct wps_credential *cred,
|
|
const u8 *eap_type, size_t eap_type_len)
|
|
{
|
|
if (eap_type == NULL)
|
|
return 0; /* optional attribute */
|
|
|
|
wpa_hexdump(MSG_DEBUG, "WPS: EAP Type", eap_type, eap_type_len);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int wps_process_cred_eap_identity(struct wps_credential *cred,
|
|
const u8 *identity,
|
|
size_t identity_len)
|
|
{
|
|
if (identity == NULL)
|
|
return 0; /* optional attribute */
|
|
|
|
wpa_hexdump_ascii(MSG_DEBUG, "WPS: EAP Identity",
|
|
identity, identity_len);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int wps_process_cred_key_prov_auto(struct wps_credential *cred,
|
|
const u8 *key_prov_auto)
|
|
{
|
|
if (key_prov_auto == NULL)
|
|
return 0; /* optional attribute */
|
|
|
|
wpa_printf(MSG_DEBUG, "WPS: Key Provided Automatically: %d",
|
|
*key_prov_auto);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int wps_process_cred_802_1x_enabled(struct wps_credential *cred,
|
|
const u8 *dot1x_enabled)
|
|
{
|
|
if (dot1x_enabled == NULL)
|
|
return 0; /* optional attribute */
|
|
|
|
wpa_printf(MSG_DEBUG, "WPS: 802.1X Enabled: %d", *dot1x_enabled);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int wps_process_cred(struct wps_parse_attr *attr,
|
|
struct wps_credential *cred)
|
|
{
|
|
wpa_printf(MSG_DEBUG, "WPS: Process Credential");
|
|
|
|
/* TODO: support multiple Network Keys */
|
|
if (wps_process_cred_network_idx(cred, attr->network_idx) ||
|
|
wps_process_cred_ssid(cred, attr->ssid, attr->ssid_len) ||
|
|
wps_process_cred_auth_type(cred, attr->auth_type) ||
|
|
wps_process_cred_encr_type(cred, attr->encr_type) ||
|
|
wps_process_cred_network_key_idx(cred, attr->network_key_idx) ||
|
|
wps_process_cred_network_key(cred, attr->network_key,
|
|
attr->network_key_len) ||
|
|
wps_process_cred_mac_addr(cred, attr->mac_addr) ||
|
|
wps_process_cred_eap_type(cred, attr->eap_type,
|
|
attr->eap_type_len) ||
|
|
wps_process_cred_eap_identity(cred, attr->eap_identity,
|
|
attr->eap_identity_len) ||
|
|
wps_process_cred_key_prov_auto(cred, attr->key_prov_auto) ||
|
|
wps_process_cred_802_1x_enabled(cred, attr->dot1x_enabled))
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int wps_process_ap_settings(struct wps_parse_attr *attr,
|
|
struct wps_credential *cred)
|
|
{
|
|
wpa_printf(MSG_DEBUG, "WPS: Processing AP Settings");
|
|
os_memset(cred, 0, sizeof(*cred));
|
|
/* TODO: optional attributes New Password and Device Password ID */
|
|
if (wps_process_cred_ssid(cred, attr->ssid, attr->ssid_len) ||
|
|
wps_process_cred_auth_type(cred, attr->auth_type) ||
|
|
wps_process_cred_encr_type(cred, attr->encr_type) ||
|
|
wps_process_cred_network_key_idx(cred, attr->network_key_idx) ||
|
|
wps_process_cred_network_key(cred, attr->network_key,
|
|
attr->network_key_len) ||
|
|
wps_process_cred_mac_addr(cred, attr->mac_addr))
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|