640 lines
17 KiB
C
640 lines
17 KiB
C
/*
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* Wi-Fi Protected Setup
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* Copyright (c) 2007-2009, Jouni Malinen <j@w1.fi>
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*
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* This software may be distributed under the terms of the BSD license.
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* See README for more details.
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*/
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#include <string.h>
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#include "wpa/includes.h"
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#include "wpa/wpa.h"
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#include "wpa/common.h"
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#include "wpa/eapol_common.h"
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#include "wpa/wpa_debug.h"
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#include "wpa/ieee802_11_defs.h"
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#include "crypto/dh_group5.h"
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#include "wps/wps_i.h"
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#include "wps/wps_dev_attr.h"
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#include "wpa2/eap_peer/eap_defs.h"
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#include "wpa2/eap_peer/eap_common.h"
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/**
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* wps_process_msg - Process a WPS message
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* @wps: WPS Registration protocol data from wps_init()
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* @op_code: Message OP Code
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* @msg: Message data
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* Returns: Processing result
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*
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* This function is used to process WPS messages with OP Codes WSC_ACK,
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* WSC_NACK, WSC_MSG, and WSC_Done. The caller (e.g., EAP server/peer) is
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* responsible for reassembling the messages before calling this function.
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* Response to this message is built by calling wps_get_msg().
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*/
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enum wps_process_res wps_process_msg(struct wps_data *wps,
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enum wsc_op_code op_code,
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const struct wpabuf *msg)
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{
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if (wps->registrar)
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return wps_registrar_process_msg(wps, op_code, msg);
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else
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return wps_enrollee_process_msg(wps, op_code, msg);
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}
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/**
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* wps_get_msg - Build a WPS message
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* @wps: WPS Registration protocol data from wps_init()
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* @op_code: Buffer for returning message OP Code
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* Returns: The generated WPS message or %NULL on failure
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*
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* This function is used to build a response to a message processed by calling
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* wps_process_msg(). The caller is responsible for freeing the buffer.
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*/
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struct wpabuf * wps_get_msg(struct wps_data *wps, enum wsc_op_code *op_code)
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{
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if (wps->registrar)
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return wps_registrar_get_msg(wps, op_code);
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else
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return wps_enrollee_get_msg(wps, op_code);
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}
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/**
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* wps_is_selected_pbc_registrar - Check whether WPS IE indicates active PBC
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* @msg: WPS IE contents from Beacon or Probe Response frame
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* Returns: 1 if PBC Registrar is active, 0 if not
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*/
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int wps_is_selected_pbc_registrar(const struct wpabuf *msg, u8 *bssid)
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{
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struct wps_sm *sm = wps_sm_get();
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struct wps_parse_attr *attr = (struct wps_parse_attr *)os_zalloc(sizeof(struct wps_parse_attr));
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int i = 0;
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/*
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* In theory, this could also verify that attr.sel_reg_config_methods
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* includes WPS_CONFIG_PUSHBUTTON, but some deployed AP implementations
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* do not set Selected Registrar Config Methods attribute properly, so
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* it is safer to just use Device Password ID here.
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*/
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if (wps_parse_msg(msg, attr) < 0) {
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os_free(attr);
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return 0;
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}
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if(!attr->selected_registrar || *attr->selected_registrar == 0) {
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if (sm->ignore_sel_reg == false) {
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os_free(attr);
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return 0;
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}
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else {
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for (i = 0; i < WPS_MAX_DIS_AP_NUM; i++) {
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if (0 == os_memcmp(sm->dis_ap_list[i].bssid, bssid, 6)) {
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wpa_printf(MSG_DEBUG, "discard ap bssid[%02x:%02x:%02x:%02x:%02x:%02x]\n", \
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bssid[0], bssid[1], bssid[2], bssid[3], bssid[4], bssid[5]);
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os_free(attr);
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return 0;
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}
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}
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}
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}
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if (!attr->dev_password_id ||
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WPA_GET_BE16(attr->dev_password_id) != DEV_PW_PUSHBUTTON) {
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os_free(attr);
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return 0;
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}
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#if 0
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#ifdef CONFIG_WPS_STRICT
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if (!attr->sel_reg_config_methods ||
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!(WPA_GET_BE16(attr->sel_reg_config_methods) &
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WPS_CONFIG_PUSHBUTTON)) {
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os_free(attr);
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return 0;
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}
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#endif /* CONFIG_WPS_STRICT */
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#endif
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os_free(attr);
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return 1;
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}
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#ifdef CONFIG_WPS_PIN
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static int is_selected_pin_registrar(struct wps_parse_attr *attr, u8 *bssid)
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{
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struct wps_sm *sm = wps_sm_get();
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int i = 0;
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if (!sm || !bssid){
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return 0;
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}
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/*
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* In theory, this could also verify that attr.sel_reg_config_methods
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* includes WPS_CONFIG_LABEL, WPS_CONFIG_DISPLAY, or WPS_CONFIG_KEYPAD,
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* but some deployed AP implementations do not set Selected Registrar
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* Config Methods attribute properly, so it is safer to just use
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* Device Password ID here.
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*/
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if (!attr->selected_registrar || *attr->selected_registrar == 0) {
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if (sm->ignore_sel_reg == false) {
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return 0;
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}
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else {
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for (i = 0; i < WPS_MAX_DIS_AP_NUM; i++) {
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if (0 == os_memcmp(sm->dis_ap_list[i].bssid, bssid, 6)) {
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wpa_printf(MSG_DEBUG, "discard ap bssid[%02x:%02x:%02x:%02x:%02x:%02x]\n", \
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bssid[0], bssid[1], bssid[2], bssid[3], bssid[4], bssid[5]);
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return 0;
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}
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}
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}
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}
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if (attr->dev_password_id != NULL &&
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WPA_GET_BE16(attr->dev_password_id) == DEV_PW_PUSHBUTTON) {
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return 0;
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}
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#ifdef CONFIG_WPS_STRICT
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if (!attr->sel_reg_config_methods)// ||
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//!(WPA_GET_BE16(attr->sel_reg_config_methods) &
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//(WPS_CONFIG_LABEL | WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD)))
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return 0;
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#endif /* CONFIG_WPS_STRICT */
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return 1;
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}
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/**
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* wps_is_selected_pin_registrar - Check whether WPS IE indicates active PIN
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* @msg: WPS IE contents from Beacon or Probe Response frame
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* Returns: 1 if PIN Registrar is active, 0 if not
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*/
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int wps_is_selected_pin_registrar(const struct wpabuf *msg, u8 *bssid)
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{
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struct wps_parse_attr *attr;
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int ret;
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attr = (struct wps_parse_attr *)os_zalloc(sizeof(struct wps_parse_attr));
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if (attr == NULL)
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return -99;
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if (wps_parse_msg(msg, attr) < 0) {
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os_free(attr);
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return 0;
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}
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ret = is_selected_pin_registrar(attr, bssid);
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os_free(attr);
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return ret;
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}
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#endif
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/**
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* wps_is_addr_authorized - Check whether WPS IE authorizes MAC address
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* @msg: WPS IE contents from Beacon or Probe Response frame
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* @addr: MAC address to search for
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* @ver1_compat: Whether to use version 1 compatibility mode
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* Returns: 2 if the specified address is explicit authorized, 1 if address is
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* authorized (broadcast), 0 if not
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*/
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int wps_is_addr_authorized(const struct wpabuf *msg, const u8 *addr,
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int ver1_compat)
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{
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struct wps_sm *sm = wps_sm_get();
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struct wps_parse_attr *attr;
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int ret = 0;
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unsigned int i;
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const u8 *pos;
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const u8 bcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
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if (!sm){
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return -10;
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}
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attr = (struct wps_parse_attr *)os_zalloc(sizeof(struct wps_parse_attr));
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if (attr == NULL) {
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ret = -99;
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goto _out;
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}
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if (wps_parse_msg(msg, attr) < 0) {
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ret = 0;
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goto _out;
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}
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if (!attr->version2 && ver1_compat) {
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/*
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* Version 1.0 AP - AuthorizedMACs not used, so revert back to
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* old mechanism of using SelectedRegistrar.
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*/
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#ifdef CONFIG_WPS_PIN
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ret = is_selected_pin_registrar(attr, sm->config.bssid);
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goto _out;
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#endif
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}
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if (!attr->authorized_macs) {
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ret = 0;
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goto _out;
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}
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pos = attr->authorized_macs;
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for (i = 0; i < attr->authorized_macs_len / ETH_ALEN; i++) {
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if (os_memcmp(pos, addr, ETH_ALEN) == 0) {
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ret = 2;
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goto _out;
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}
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if (os_memcmp(pos, bcast, ETH_ALEN) == 0) {
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ret = 1;
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goto _out;
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}
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pos += ETH_ALEN;
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}
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_out:
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if (attr)
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os_free(attr);
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return ret;
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}
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/**
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* wps_ap_priority_compar - Prioritize WPS IE from two APs
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* @wps_a: WPS IE contents from Beacon or Probe Response frame
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* @wps_b: WPS IE contents from Beacon or Probe Response frame
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* Returns: 1 if wps_b is considered more likely selection for WPS
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* provisioning, -1 if wps_a is considered more like, or 0 if no preference
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*/
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int wps_ap_priority_compar(const struct wpabuf *wps_a,
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const struct wpabuf *wps_b)
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{
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struct wps_parse_attr *attr = NULL;
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int sel_a, sel_b;
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int ret = 0; /* No preference */
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attr = os_zalloc(sizeof(*attr));
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if (!attr)
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return ret;
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if (wps_a == NULL || wps_parse_msg(wps_a, attr) < 0) {
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ret = 1;
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goto exit;
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}
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sel_a = attr->selected_registrar && *(attr->selected_registrar) != 0;
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if (wps_b == NULL || wps_parse_msg(wps_b, attr) < 0) {
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ret = -1;
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goto exit;
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}
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sel_b = attr->selected_registrar && *(attr->selected_registrar) != 0;
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if (sel_a && !sel_b) {
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ret = -1;
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goto exit;
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}
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if (!sel_a && sel_b) {
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ret = 1;
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goto exit;
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}
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exit:
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os_free(attr);
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return ret;
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}
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/**
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* wps_get_uuid_e - Get UUID-E from WPS IE
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* @msg: WPS IE contents from Beacon or Probe Response frame
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* Returns: Pointer to UUID-E or %NULL if not included
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*
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* The returned pointer is to the msg contents and it remains valid only as
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* long as the msg buffer is valid.
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*/
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const u8 * wps_get_uuid_e(const struct wpabuf *msg)
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{
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struct wps_parse_attr *attr;
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const u8 *uuid_e;
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attr = (struct wps_parse_attr *)os_zalloc(sizeof(struct wps_parse_attr));
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if (attr == NULL)
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return NULL;
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if (wps_parse_msg(msg, attr) < 0) {
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uuid_e = NULL;
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} else {
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uuid_e = attr->uuid_e;
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}
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os_free(attr);
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return uuid_e;
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}
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/**
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* wps_is_20 - Check whether WPS attributes claim support for WPS 2.0
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*/
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int wps_is_20(const struct wpabuf *msg)
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{
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struct wps_parse_attr *attr;
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int ret;
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attr = (struct wps_parse_attr *)os_zalloc(sizeof(struct wps_parse_attr));
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if (attr == NULL)
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return 0;
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if (msg == NULL || wps_parse_msg(msg, attr) < 0) {
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ret = 0;
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} else {
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ret = (attr->version2 != NULL);
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}
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os_free(attr);
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return ret;
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}
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/**
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* wps_build_assoc_req_ie - Build WPS IE for (Re)Association Request
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* @req_type: Value for Request Type attribute
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* Returns: WPS IE or %NULL on failure
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*
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* The caller is responsible for freeing the buffer.
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*/
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struct wpabuf * wps_build_assoc_req_ie(enum wps_request_type req_type)
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{
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struct wpabuf *ie;
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u8 *len;
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wpa_printf(MSG_DEBUG, "WPS: Building WPS IE for (Re)Association "
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"Request");
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ie = wpabuf_alloc(100);
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if (ie == NULL)
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return NULL;
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wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC);
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len = wpabuf_put(ie, 1);
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wpabuf_put_be32(ie, WPS_DEV_OUI_WFA);
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if (wps_build_version(ie) ||
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wps_build_req_type(ie, req_type) ||
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wps_build_wfa_ext(ie, 0, NULL, 0)) {
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wpabuf_free(ie);
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return NULL;
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}
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*len = wpabuf_len(ie) - 2;
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return ie;
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}
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/**
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* wps_build_assoc_resp_ie - Build WPS IE for (Re)Association Response
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* Returns: WPS IE or %NULL on failure
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*
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* The caller is responsible for freeing the buffer.
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*/
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struct wpabuf * wps_build_assoc_resp_ie(void)
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{
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struct wpabuf *ie;
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u8 *len;
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wpa_printf(MSG_DEBUG, "WPS: Building WPS IE for (Re)Association "
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"Response");
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ie = wpabuf_alloc(100);
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if (ie == NULL)
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return NULL;
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wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC);
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len = wpabuf_put(ie, 1);
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wpabuf_put_be32(ie, WPS_DEV_OUI_WFA);
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if (wps_build_version(ie) ||
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wps_build_resp_type(ie, WPS_RESP_AP) ||
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wps_build_wfa_ext(ie, 0, NULL, 0)) {
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wpabuf_free(ie);
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return NULL;
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}
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*len = wpabuf_len(ie) - 2;
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return ie;
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}
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/**
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* wps_build_probe_req_ie - Build WPS IE for Probe Request
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* @pw_id: Password ID (DEV_PW_PUSHBUTTON for active PBC and DEV_PW_DEFAULT for
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* most other use cases)
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* @dev: Device attributes
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* @uuid: Own UUID
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* @req_type: Value for Request Type attribute
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* @num_req_dev_types: Number of requested device types
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* @req_dev_types: Requested device types (8 * num_req_dev_types octets) or
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* %NULL if none
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* Returns: WPS IE or %NULL on failure
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*
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* The caller is responsible for freeing the buffer.
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*/
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struct wpabuf * wps_build_probe_req_ie(u16 pw_id, struct wps_device_data *dev,
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const u8 *uuid,
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enum wps_request_type req_type,
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unsigned int num_req_dev_types,
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const u8 *req_dev_types)
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{
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struct wpabuf *ie;
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wpa_printf(MSG_DEBUG, "WPS: Building WPS IE for Probe Request\n");
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ie = wpabuf_alloc(400);
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if (ie == NULL) {
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wpa_printf(MSG_ERROR, "WPS: ie alloc failed.");
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return NULL;
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}
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if (wps_build_version(ie) ||
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wps_build_req_type(ie, req_type) ||
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wps_build_config_methods(ie, dev->config_methods) ||
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wps_build_uuid_e(ie, uuid) ||
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wps_build_primary_dev_type(dev, ie) ||
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wps_build_rf_bands(dev, ie) ||
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wps_build_assoc_state(NULL, ie) ||
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wps_build_config_error(ie, WPS_CFG_NO_ERROR) ||
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wps_build_dev_password_id(ie, pw_id) ||
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#ifdef CONFIG_WPS2
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wps_build_manufacturer(dev, ie) ||
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wps_build_model_name(dev, ie) ||
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wps_build_model_number(dev, ie) ||
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wps_build_dev_name(dev, ie) ||
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wps_build_wfa_ext(ie, req_type == WPS_REQ_ENROLLEE, NULL, 0) ||
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#endif /* CONFIG_WPS2 */
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wps_build_req_dev_type(dev, ie, num_req_dev_types, req_dev_types)
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||
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wps_build_secondary_dev_type(dev, ie)
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) {
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wpabuf_free(ie);
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return NULL;
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}
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#ifndef CONFIG_WPS2
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if (dev->p2p && wps_build_dev_name(dev, ie)) {
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wpabuf_free(ie);
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return NULL;
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}
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#endif /* CONFIG_WPS2 */
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return wps_ie_encapsulate(ie);
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}
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#ifdef CONFIG_WPS_UPNP
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void wps_free_pending_msgs(struct upnp_pending_message *msgs)
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{
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struct upnp_pending_message *p, *prev;
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p = msgs;
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while (p) {
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prev = p;
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p = p->next;
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|
wpabuf_free(prev->msg);
|
|
os_free(prev);
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|
|
int wps_attr_text(struct wpabuf *data, char *buf, char *end)
|
|
{
|
|
struct wps_parse_attr *attr;
|
|
char *pos = buf;
|
|
int ret;
|
|
|
|
attr = (struct wps_parse_attr *)os_zalloc(sizeof(struct wps_parse_attr));
|
|
if (attr == NULL)
|
|
return -99;
|
|
|
|
if (wps_parse_msg(data, attr) < 0) {
|
|
ret = -1;
|
|
goto _out;
|
|
}
|
|
|
|
if (attr->wps_state) {
|
|
if (*attr->wps_state == WPS_STATE_NOT_CONFIGURED)
|
|
ret = snprintf(pos, end - pos,
|
|
"wps_state=unconfigured\n");
|
|
else if (*attr->wps_state == WPS_STATE_CONFIGURED)
|
|
ret = snprintf(pos, end - pos,
|
|
"wps_state=configured\n");
|
|
else
|
|
ret = 0;
|
|
if (ret < 0 || ret >= end - pos) {
|
|
ret = pos - buf;
|
|
goto _out;
|
|
}
|
|
pos += ret;
|
|
}
|
|
|
|
if (attr->ap_setup_locked && *attr->ap_setup_locked) {
|
|
ret = snprintf(pos, end - pos,
|
|
"wps_ap_setup_locked=1\n");
|
|
if (ret < 0 || ret >= end - pos) {
|
|
ret = pos - buf;
|
|
goto _out;
|
|
}
|
|
pos += ret;
|
|
}
|
|
|
|
if (attr->selected_registrar && *attr->selected_registrar) {
|
|
ret = snprintf(pos, end - pos,
|
|
"wps_selected_registrar=1\n");
|
|
if (ret < 0 || ret >= end - pos) {
|
|
ret = pos - buf;
|
|
goto _out;
|
|
}
|
|
pos += ret;
|
|
}
|
|
|
|
if (attr->dev_password_id) {
|
|
ret = snprintf(pos, end - pos,
|
|
"wps_device_password_id=%u\n",
|
|
WPA_GET_BE16(attr->dev_password_id));
|
|
if (ret < 0 || ret >= end - pos) {
|
|
ret = pos - buf;
|
|
goto _out;
|
|
}
|
|
pos += ret;
|
|
}
|
|
|
|
if (attr->sel_reg_config_methods) {
|
|
ret = snprintf(pos, end - pos,
|
|
"wps_selected_registrar_config_methods="
|
|
"0x%04x\n",
|
|
WPA_GET_BE16(attr->sel_reg_config_methods));
|
|
if (ret < 0 || ret >= end - pos) {
|
|
ret = pos - buf;
|
|
goto _out;
|
|
}
|
|
pos += ret;
|
|
}
|
|
|
|
if (attr->primary_dev_type) {
|
|
char devtype[WPS_DEV_TYPE_BUFSIZE];
|
|
ret = snprintf(pos, end - pos,
|
|
"wps_primary_device_type=%s\n",
|
|
wps_dev_type_bin2str(attr->primary_dev_type,
|
|
devtype,
|
|
sizeof(devtype)));
|
|
if (ret < 0 || ret >= end - pos) {
|
|
ret = pos - buf;
|
|
goto _out;
|
|
}
|
|
pos += ret;
|
|
}
|
|
|
|
if (attr->dev_name) {
|
|
char *str = (char *)os_malloc(attr->dev_name_len + 1);
|
|
size_t i;
|
|
if (str == NULL) {
|
|
ret = pos - buf;
|
|
goto _out;
|
|
}
|
|
for (i = 0; i < attr->dev_name_len; i++) {
|
|
if (attr->dev_name[i] < 32)
|
|
str[i] = '_';
|
|
else
|
|
str[i] = attr->dev_name[i];
|
|
}
|
|
str[i] = '\0';
|
|
ret = snprintf(pos, end - pos, "wps_device_name=%s\n", str);
|
|
os_free(str);
|
|
if (ret < 0 || ret >= end - pos) {
|
|
ret = pos - buf;
|
|
goto _out;
|
|
}
|
|
pos += ret;
|
|
}
|
|
|
|
if (attr->config_methods) {
|
|
ret = snprintf(pos, end - pos,
|
|
"wps_config_methods=0x%04x\n",
|
|
WPA_GET_BE16(attr->config_methods));
|
|
if (ret < 0 || ret >= end - pos) {
|
|
ret = pos - buf;
|
|
goto _out;
|
|
}
|
|
pos += ret;
|
|
}
|
|
|
|
ret = pos - buf;
|
|
_out:
|
|
if (attr)
|
|
os_free(attr);
|
|
return ret;
|
|
}
|