wps_supplicant.c

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/*
 * wpa_supplicant / WPS integration
 * Copyright (c) 2008-2010, Jouni Malinen <j@w1.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "includes.h"

#include "common.h"
#include "eloop.h"
#include "uuid.h"
#include "crypto/dh_group5.h"
#include "common/ieee802_11_defs.h"
#include "common/ieee802_11_common.h"
#include "common/wpa_common.h"
#include "common/wpa_ctrl.h"
#include "eap_common/eap_wsc_common.h"
#include "eap_peer/eap.h"
#include "rsn_supp/wpa.h"
#include "config.h"
#include "wpa_supplicant_i.h"
#include "driver_i.h"
#include "notify.h"
#include "blacklist.h"
#include "bss.h"
#include "scan.h"
#include "wps_supplicant.h"


#define WPS_PIN_SCAN_IGNORE_SEL_REG 3

static void wpas_wps_timeout(void *eloop_ctx, void *timeout_ctx);
static void wpas_clear_wps(struct wpa_supplicant *wpa_s);


int wpas_wps_eapol_cb(struct wpa_supplicant *wpa_s)
{
        if (!wpa_s->wps_success &&
            wpa_s->current_ssid &&
            eap_is_wps_pin_enrollee(&wpa_s->current_ssid->eap)) {
                const u8 *bssid = wpa_s->bssid;
                if (is_zero_ether_addr(bssid))
                        bssid = wpa_s->pending_bssid;

                wpa_printf(MSG_DEBUG, "WPS: PIN registration with " MACSTR
                           " did not succeed - continue trying to find "
                           "suitable AP", MAC2STR(bssid));
                wpa_blacklist_add(wpa_s, bssid);

                wpa_supplicant_deauthenticate(wpa_s,
                                              WLAN_REASON_DEAUTH_LEAVING);
                wpa_s->reassociate = 1;
                wpa_supplicant_req_scan(wpa_s,
                                        wpa_s->blacklist_cleared ? 5 : 0, 0);
                wpa_s->blacklist_cleared = 0;
                return 1;
        }

        eloop_cancel_timeout(wpas_wps_timeout, wpa_s, NULL);

        if (wpa_s->key_mgmt == WPA_KEY_MGMT_WPS && wpa_s->current_ssid &&
            !(wpa_s->current_ssid->key_mgmt & WPA_KEY_MGMT_WPS)) {
                wpa_printf(MSG_DEBUG, "WPS: Network configuration replaced - "
                           "try to associate with the received credential");
                wpa_supplicant_deauthenticate(wpa_s,
                                              WLAN_REASON_DEAUTH_LEAVING);
                wpa_s->after_wps = 5;
                wpa_s->wps_freq = wpa_s->assoc_freq;
                wpa_s->reassociate = 1;
                wpa_supplicant_req_scan(wpa_s, 0, 0);
                return 1;
        }

        if (wpa_s->key_mgmt == WPA_KEY_MGMT_WPS && wpa_s->current_ssid) {
                wpa_printf(MSG_DEBUG, "WPS: Registration completed - waiting "
                           "for external credential processing");
                wpas_clear_wps(wpa_s);
                wpa_supplicant_deauthenticate(wpa_s,
                                              WLAN_REASON_DEAUTH_LEAVING);
                return 1;
        }

        return 0;
}


static void wpas_wps_security_workaround(struct wpa_supplicant *wpa_s,
                                         struct wpa_ssid *ssid,
                                         const struct wps_credential *cred)
{
        struct wpa_driver_capa capa;
        struct wpa_bss *bss;
        const u8 *ie;
        struct wpa_ie_data adv;
        int wpa2 = 0, ccmp = 0;

        /*
         * Many existing WPS APs do not know how to negotiate WPA2 or CCMP in
         * case they are configured for mixed mode operation (WPA+WPA2 and
         * TKIP+CCMP). Try to use scan results to figure out whether the AP
         * actually supports stronger security and select that if the client
         * has support for it, too.
         */

        if (wpa_drv_get_capa(wpa_s, &capa))
                return; /* Unknown what driver supports */

        bss = wpa_bss_get(wpa_s, cred->mac_addr, ssid->ssid, ssid->ssid_len);
        if (bss == NULL) {
                wpa_printf(MSG_DEBUG, "WPS: The AP was not found from BSS "
                           "table - use credential as-is");
                return;
        }

        wpa_printf(MSG_DEBUG, "WPS: AP found from BSS table");

        ie = wpa_bss_get_ie(bss, WLAN_EID_RSN);
        if (ie && wpa_parse_wpa_ie(ie, 2 + ie[1], &adv) == 0) {
                wpa2 = 1;
                if (adv.pairwise_cipher & WPA_CIPHER_CCMP)
                        ccmp = 1;
        } else {
                ie = wpa_bss_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE);
                if (ie && wpa_parse_wpa_ie(ie, 2 + ie[1], &adv) == 0 &&
                    adv.pairwise_cipher & WPA_CIPHER_CCMP)
                        ccmp = 1;
        }

        if (ie == NULL && (ssid->proto & WPA_PROTO_WPA) &&
            (ssid->pairwise_cipher & WPA_CIPHER_TKIP)) {
                /*
                 * TODO: This could be the initial AP configuration and the
                 * Beacon contents could change shortly. Should request a new
                 * scan and delay addition of the network until the updated
                 * scan results are available.
                 */
                wpa_printf(MSG_DEBUG, "WPS: The AP did not yet advertise WPA "
                           "support - use credential as-is");
                return;
        }

        if (ccmp && !(ssid->pairwise_cipher & WPA_CIPHER_CCMP) &&
            (ssid->pairwise_cipher & WPA_CIPHER_TKIP) &&
            (capa.key_mgmt & WPA_DRIVER_CAPA_KEY_MGMT_WPA2_PSK)) {
                wpa_printf(MSG_DEBUG, "WPS: Add CCMP into the credential "
                           "based on scan results");
                if (wpa_s->conf->ap_scan == 1)
                        ssid->pairwise_cipher |= WPA_CIPHER_CCMP;
                else
                        ssid->pairwise_cipher = WPA_CIPHER_CCMP;
        }

        if (wpa2 && !(ssid->proto & WPA_PROTO_RSN) &&
            (ssid->proto & WPA_PROTO_WPA) &&
            (capa.enc & WPA_DRIVER_CAPA_ENC_CCMP)) {
                wpa_printf(MSG_DEBUG, "WPS: Add WPA2 into the credential "
                           "based on scan results");
                if (wpa_s->conf->ap_scan == 1)
                        ssid->proto |= WPA_PROTO_RSN;
                else
                        ssid->proto = WPA_PROTO_RSN;
        }
}


static int wpa_supplicant_wps_cred(void *ctx,
                                   const struct wps_credential *cred)
{
        struct wpa_supplicant *wpa_s = ctx;
        struct wpa_ssid *ssid = wpa_s->current_ssid;
        u8 key_idx = 0;
        u16 auth_type;

        if ((wpa_s->conf->wps_cred_processing == 1 ||
             wpa_s->conf->wps_cred_processing == 2) && cred->cred_attr) {
                size_t blen = cred->cred_attr_len * 2 + 1;
                char *buf = os_malloc(blen);
                if (buf) {
                        wpa_snprintf_hex(buf, blen,
                                         cred->cred_attr, cred->cred_attr_len);
                        wpa_msg(wpa_s, MSG_INFO, "%s%s",
                                WPS_EVENT_CRED_RECEIVED, buf);
                        os_free(buf);
                }

                wpas_notify_wps_credential(wpa_s, cred);
        } else
                wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_CRED_RECEIVED);

        wpa_hexdump_key(MSG_DEBUG, "WPS: Received Credential attribute",
                        cred->cred_attr, cred->cred_attr_len);

        if (wpa_s->conf->wps_cred_processing == 1)
                return 0;

        wpa_hexdump_ascii(MSG_DEBUG, "WPS: SSID", cred->ssid, cred->ssid_len);
        wpa_printf(MSG_DEBUG, "WPS: Authentication Type 0x%x",
                   cred->auth_type);
        wpa_printf(MSG_DEBUG, "WPS: Encryption Type 0x%x", cred->encr_type);
        wpa_printf(MSG_DEBUG, "WPS: Network Key Index %d", cred->key_idx);
        wpa_hexdump_key(MSG_DEBUG, "WPS: Network Key",
                        cred->key, cred->key_len);
        wpa_printf(MSG_DEBUG, "WPS: MAC Address " MACSTR,
                   MAC2STR(cred->mac_addr));

        auth_type = cred->auth_type;
        if (auth_type == (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) {
                wpa_printf(MSG_DEBUG, "WPS: Workaround - convert mixed-mode "
                           "auth_type into WPA2PSK");
                auth_type = WPS_AUTH_WPA2PSK;
        }

        if (auth_type != WPS_AUTH_OPEN &&
            auth_type != WPS_AUTH_SHARED &&
            auth_type != WPS_AUTH_WPAPSK &&
            auth_type != WPS_AUTH_WPA2PSK) {
                wpa_printf(MSG_DEBUG, "WPS: Ignored credentials for "
                           "unsupported authentication type 0x%x",
                           auth_type);
                return 0;
        }

        if (ssid && (ssid->key_mgmt & WPA_KEY_MGMT_WPS)) {
                wpa_printf(MSG_DEBUG, "WPS: Replace WPS network block based "
                           "on the received credential");
                os_free(ssid->eap.identity);
                ssid->eap.identity = NULL;
                ssid->eap.identity_len = 0;
                os_free(ssid->eap.phase1);
                ssid->eap.phase1 = NULL;
                os_free(ssid->eap.eap_methods);
                ssid->eap.eap_methods = NULL;
        } else {
                wpa_printf(MSG_DEBUG, "WPS: Create a new network based on the "
                           "received credential");
                ssid = wpa_config_add_network(wpa_s->conf);
                if (ssid == NULL)
                        return -1;
                wpas_notify_network_added(wpa_s, ssid);
        }

        wpa_config_set_network_defaults(ssid);

        os_free(ssid->ssid);
        ssid->ssid = os_malloc(cred->ssid_len);
        if (ssid->ssid) {
                os_memcpy(ssid->ssid, cred->ssid, cred->ssid_len);
                ssid->ssid_len = cred->ssid_len;
        }

        switch (cred->encr_type) {
        case WPS_ENCR_NONE:
                break;
        case WPS_ENCR_WEP:
                if (cred->key_len <= 0)
                        break;
                if (cred->key_len != 5 && cred->key_len != 13 &&
                    cred->key_len != 10 && cred->key_len != 26) {
                        wpa_printf(MSG_ERROR, "WPS: Invalid WEP Key length "
                                   "%lu", (unsigned long) cred->key_len);
                        return -1;
                }
                if (cred->key_idx > NUM_WEP_KEYS) {
                        wpa_printf(MSG_ERROR, "WPS: Invalid WEP Key index %d",
                                   cred->key_idx);
                        return -1;
                }
                if (cred->key_idx)
                        key_idx = cred->key_idx - 1;
                if (cred->key_len == 10 || cred->key_len == 26) {
                        if (hexstr2bin((char *) cred->key,
                                       ssid->wep_key[key_idx],
                                       cred->key_len / 2) < 0) {
                                wpa_printf(MSG_ERROR, "WPS: Invalid WEP Key "
                                           "%d", key_idx);
                                return -1;
                        }
                        ssid->wep_key_len[key_idx] = cred->key_len / 2;
                } else {
                        os_memcpy(ssid->wep_key[key_idx], cred->key,
                                  cred->key_len);
                        ssid->wep_key_len[key_idx] = cred->key_len;
                }
                ssid->wep_tx_keyidx = key_idx;
                break;
        case WPS_ENCR_TKIP:
                ssid->pairwise_cipher = WPA_CIPHER_TKIP;
                break;
        case WPS_ENCR_AES:
                ssid->pairwise_cipher = WPA_CIPHER_CCMP;
                break;
        }

        switch (auth_type) {
        case WPS_AUTH_OPEN:
                ssid->auth_alg = WPA_AUTH_ALG_OPEN;
                ssid->key_mgmt = WPA_KEY_MGMT_NONE;
                ssid->proto = 0;
                break;
        case WPS_AUTH_SHARED:
                ssid->auth_alg = WPA_AUTH_ALG_SHARED;
                ssid->key_mgmt = WPA_KEY_MGMT_NONE;
                ssid->proto = 0;
                break;
        case WPS_AUTH_WPAPSK:
                ssid->auth_alg = WPA_AUTH_ALG_OPEN;
                ssid->key_mgmt = WPA_KEY_MGMT_PSK;
                ssid->proto = WPA_PROTO_WPA;
                break;
        case WPS_AUTH_WPA:
                ssid->auth_alg = WPA_AUTH_ALG_OPEN;
                ssid->key_mgmt = WPA_KEY_MGMT_IEEE8021X;
                ssid->proto = WPA_PROTO_WPA;
                break;
        case WPS_AUTH_WPA2:
                ssid->auth_alg = WPA_AUTH_ALG_OPEN;
                ssid->key_mgmt = WPA_KEY_MGMT_IEEE8021X;
                ssid->proto = WPA_PROTO_RSN;
                break;
        case WPS_AUTH_WPA2PSK:
                ssid->auth_alg = WPA_AUTH_ALG_OPEN;
                ssid->key_mgmt = WPA_KEY_MGMT_PSK;
                ssid->proto = WPA_PROTO_RSN;
                break;
        }

        if (ssid->key_mgmt == WPA_KEY_MGMT_PSK) {
                if (cred->key_len == 2 * PMK_LEN) {
                        if (hexstr2bin((const char *) cred->key, ssid->psk,
                                       PMK_LEN)) {
                                wpa_printf(MSG_ERROR, "WPS: Invalid Network "
                                           "Key");
                                return -1;
                        }
                        ssid->psk_set = 1;
                } else if (cred->key_len >= 8 && cred->key_len < 2 * PMK_LEN) {
                        os_free(ssid->passphrase);
                        ssid->passphrase = os_malloc(cred->key_len + 1);
                        if (ssid->passphrase == NULL)
                                return -1;
                        os_memcpy(ssid->passphrase, cred->key, cred->key_len);
                        ssid->passphrase[cred->key_len] = '\0';
                        wpa_config_update_psk(ssid);
                } else {
                        wpa_printf(MSG_ERROR, "WPS: Invalid Network Key "
                                   "length %lu",
                                   (unsigned long) cred->key_len);
                        return -1;
                }
        }

        wpas_wps_security_workaround(wpa_s, ssid, cred);

#ifndef CONFIG_NO_CONFIG_WRITE
        if (wpa_s->conf->update_config &&
            wpa_config_write(wpa_s->confname, wpa_s->conf)) {
                wpa_printf(MSG_DEBUG, "WPS: Failed to update configuration");
                return -1;
        }
#endif /* CONFIG_NO_CONFIG_WRITE */

        return 0;
}


static void wpa_supplicant_wps_event_m2d(struct wpa_supplicant *wpa_s,
                                         struct wps_event_m2d *m2d)
{
        wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_M2D
                "dev_password_id=%d config_error=%d",
                m2d->dev_password_id, m2d->config_error);
        wpas_notify_wps_event_m2d(wpa_s, m2d);
}


static void wpa_supplicant_wps_event_fail(struct wpa_supplicant *wpa_s,
                                          struct wps_event_fail *fail)
{
        wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_FAIL "msg=%d", fail->msg);
        wpas_clear_wps(wpa_s);
        wpas_notify_wps_event_fail(wpa_s, fail);
}


static void wpa_supplicant_wps_event_success(struct wpa_supplicant *wpa_s)
{
        wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_SUCCESS);
        wpa_s->wps_success = 1;
        wpas_notify_wps_event_success(wpa_s);
}


static void wpa_supplicant_wps_event_er_ap_add(struct wpa_supplicant *wpa_s,
                                               struct wps_event_er_ap *ap)
{
        char uuid_str[100];
        char dev_type[WPS_DEV_TYPE_BUFSIZE];

        uuid_bin2str(ap->uuid, uuid_str, sizeof(uuid_str));
        if (ap->pri_dev_type)
                wps_dev_type_bin2str(ap->pri_dev_type, dev_type,
                                     sizeof(dev_type));
        else
                dev_type[0] = '\0';

        wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_ER_AP_ADD "%s " MACSTR
                " pri_dev_type=%s wps_state=%d |%s|%s|%s|%s|%s|%s|",
                uuid_str, MAC2STR(ap->mac_addr), dev_type, ap->wps_state,
                ap->friendly_name ? ap->friendly_name : "",
                ap->manufacturer ? ap->manufacturer : "",
                ap->model_description ? ap->model_description : "",
                ap->model_name ? ap->model_name : "",
                ap->manufacturer_url ? ap->manufacturer_url : "",
                ap->model_url ? ap->model_url : "");
}


static void wpa_supplicant_wps_event_er_ap_remove(struct wpa_supplicant *wpa_s,
                                                  struct wps_event_er_ap *ap)
{
        char uuid_str[100];
        uuid_bin2str(ap->uuid, uuid_str, sizeof(uuid_str));
        wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_ER_AP_REMOVE "%s", uuid_str);
}


static void wpa_supplicant_wps_event_er_enrollee_add(
        struct wpa_supplicant *wpa_s, struct wps_event_er_enrollee *enrollee)
{
        char uuid_str[100];
        char dev_type[WPS_DEV_TYPE_BUFSIZE];

        uuid_bin2str(enrollee->uuid, uuid_str, sizeof(uuid_str));
        if (enrollee->pri_dev_type)
                wps_dev_type_bin2str(enrollee->pri_dev_type, dev_type,
                                     sizeof(dev_type));
        else
                dev_type[0] = '\0';

        wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_ER_ENROLLEE_ADD "%s " MACSTR
                " M1=%d config_methods=0x%x dev_passwd_id=%d pri_dev_type=%s "
                "|%s|%s|%s|%s|%s|",
                uuid_str, MAC2STR(enrollee->mac_addr), enrollee->m1_received,
                enrollee->config_methods, enrollee->dev_passwd_id, dev_type,
                enrollee->dev_name ? enrollee->dev_name : "",
                enrollee->manufacturer ? enrollee->manufacturer : "",
                enrollee->model_name ? enrollee->model_name : "",
                enrollee->model_number ? enrollee->model_number : "",
                enrollee->serial_number ? enrollee->serial_number : "");
}


static void wpa_supplicant_wps_event_er_enrollee_remove(
        struct wpa_supplicant *wpa_s, struct wps_event_er_enrollee *enrollee)
{
        char uuid_str[100];
        uuid_bin2str(enrollee->uuid, uuid_str, sizeof(uuid_str));
        wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_ER_ENROLLEE_REMOVE "%s " MACSTR,
                uuid_str, MAC2STR(enrollee->mac_addr));
}


static void wpa_supplicant_wps_event(void *ctx, enum wps_event event,
                                     union wps_event_data *data)
{
        struct wpa_supplicant *wpa_s = ctx;
        switch (event) {
        case WPS_EV_M2D:
                wpa_supplicant_wps_event_m2d(wpa_s, &data->m2d);
                break;
        case WPS_EV_FAIL:
                wpa_supplicant_wps_event_fail(wpa_s, &data->fail);
                break;
        case WPS_EV_SUCCESS:
                wpa_supplicant_wps_event_success(wpa_s);
                break;
        case WPS_EV_PWD_AUTH_FAIL:
                break;
        case WPS_EV_PBC_OVERLAP:
                break;
        case WPS_EV_PBC_TIMEOUT:
                break;
        case WPS_EV_ER_AP_ADD:
                wpa_supplicant_wps_event_er_ap_add(wpa_s, &data->ap);
                break;
        case WPS_EV_ER_AP_REMOVE:
                wpa_supplicant_wps_event_er_ap_remove(wpa_s, &data->ap);
                break;
        case WPS_EV_ER_ENROLLEE_ADD:
                wpa_supplicant_wps_event_er_enrollee_add(wpa_s,
                                                         &data->enrollee);
                break;
        case WPS_EV_ER_ENROLLEE_REMOVE:
                wpa_supplicant_wps_event_er_enrollee_remove(wpa_s,
                                                            &data->enrollee);
                break;
        }
}


enum wps_request_type wpas_wps_get_req_type(struct wpa_ssid *ssid)
{
        if (eap_is_wps_pbc_enrollee(&ssid->eap) ||
            eap_is_wps_pin_enrollee(&ssid->eap))
                return WPS_REQ_ENROLLEE;
        else
                return WPS_REQ_REGISTRAR;
}


static void wpas_clear_wps(struct wpa_supplicant *wpa_s)
{
        int id;
        struct wpa_ssid *ssid, *remove_ssid = NULL;

        eloop_cancel_timeout(wpas_wps_timeout, wpa_s, NULL);

        /* Remove any existing WPS network from configuration */
        ssid = wpa_s->conf->ssid;
        while (ssid) {
                if (ssid->key_mgmt & WPA_KEY_MGMT_WPS) {
                        if (ssid == wpa_s->current_ssid) {
                                wpa_s->current_ssid = NULL;
                                if (ssid != NULL)
                                        wpas_notify_network_changed(wpa_s);
                        }
                        id = ssid->id;
                        remove_ssid = ssid;
                } else
                        id = -1;
                ssid = ssid->next;
                if (id >= 0) {
                        wpas_notify_network_removed(wpa_s, remove_ssid);
                        wpa_config_remove_network(wpa_s->conf, id);
                }
        }
}


static void wpas_wps_timeout(void *eloop_ctx, void *timeout_ctx)
{
        struct wpa_supplicant *wpa_s = eloop_ctx;
        wpa_printf(MSG_INFO, WPS_EVENT_TIMEOUT "Requested operation timed "
                   "out");
        wpas_clear_wps(wpa_s);
}


static struct wpa_ssid * wpas_wps_add_network(struct wpa_supplicant *wpa_s,
                                              int registrar, const u8 *bssid)
{
        struct wpa_ssid *ssid;

        ssid = wpa_config_add_network(wpa_s->conf);
        if (ssid == NULL)
                return NULL;
        wpas_notify_network_added(wpa_s, ssid);
        wpa_config_set_network_defaults(ssid);
        if (wpa_config_set(ssid, "key_mgmt", "WPS", 0) < 0 ||
            wpa_config_set(ssid, "eap", "WSC", 0) < 0 ||
            wpa_config_set(ssid, "identity", registrar ?
                           "\"" WSC_ID_REGISTRAR "\"" :
                           "\"" WSC_ID_ENROLLEE "\"", 0) < 0) {
                wpas_notify_network_removed(wpa_s, ssid);
                wpa_config_remove_network(wpa_s->conf, ssid->id);
                return NULL;
        }

        if (bssid) {
                struct wpa_bss *bss;
                int count = 0;

                os_memcpy(ssid->bssid, bssid, ETH_ALEN);
                ssid->bssid_set = 1;

                dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
                        if (os_memcmp(bssid, bss->bssid, ETH_ALEN) != 0)
                                continue;

                        os_free(ssid->ssid);
                        ssid->ssid = os_malloc(bss->ssid_len);
                        if (ssid->ssid == NULL)
                                break;
                        os_memcpy(ssid->ssid, bss->ssid, bss->ssid_len);
                        ssid->ssid_len = bss->ssid_len;
                        wpa_hexdump_ascii(MSG_DEBUG, "WPS: Picked SSID from "
                                          "scan results",
                                          ssid->ssid, ssid->ssid_len);
                        count++;
                }

                if (count > 1) {
                        wpa_printf(MSG_DEBUG, "WPS: More than one SSID found "
                                   "for the AP; use wildcard");
                        os_free(ssid->ssid);
                        ssid->ssid = NULL;
                        ssid->ssid_len = 0;
                }
        }

        return ssid;
}


static void wpas_wps_reassoc(struct wpa_supplicant *wpa_s,
                             struct wpa_ssid *selected)
{
        struct wpa_ssid *ssid;

        /* Mark all other networks disabled and trigger reassociation */
        ssid = wpa_s->conf->ssid;
        while (ssid) {
                int was_disabled = ssid->disabled;
                ssid->disabled = ssid != selected;
                if (was_disabled != ssid->disabled)
                        wpas_notify_network_enabled_changed(wpa_s, ssid);
                ssid = ssid->next;
        }
        wpa_s->disconnected = 0;
        wpa_s->reassociate = 1;
        wpa_s->scan_runs = 0;
        wpa_s->wps_success = 0;
        wpa_s->blacklist_cleared = 0;
        wpa_supplicant_req_scan(wpa_s, 0, 0);
}


int wpas_wps_start_pbc(struct wpa_supplicant *wpa_s, const u8 *bssid)
{
        struct wpa_ssid *ssid;
        wpas_clear_wps(wpa_s);
        ssid = wpas_wps_add_network(wpa_s, 0, bssid);
        if (ssid == NULL)
                return -1;
        wpa_config_set(ssid, "phase1", "\"pbc=1\"", 0);
        eloop_register_timeout(WPS_PBC_WALK_TIME, 0, wpas_wps_timeout,
                               wpa_s, NULL);
        wpas_wps_reassoc(wpa_s, ssid);
        return 0;
}


int wpas_wps_start_pin(struct wpa_supplicant *wpa_s, const u8 *bssid,
                       const char *pin)
{
        struct wpa_ssid *ssid;
        char val[128];
        unsigned int rpin = 0;

        wpas_clear_wps(wpa_s);
        ssid = wpas_wps_add_network(wpa_s, 0, bssid);
        if (ssid == NULL)
                return -1;
        if (pin)
                os_snprintf(val, sizeof(val), "\"pin=%s\"", pin);
        else {
                rpin = wps_generate_pin();
                os_snprintf(val, sizeof(val), "\"pin=%08d\"", rpin);
        }
        wpa_config_set(ssid, "phase1", val, 0);
        eloop_register_timeout(WPS_PBC_WALK_TIME, 0, wpas_wps_timeout,
                               wpa_s, NULL);
        wpas_wps_reassoc(wpa_s, ssid);
        return rpin;
}


#ifdef CONFIG_WPS_OOB
int wpas_wps_start_oob(struct wpa_supplicant *wpa_s, char *device_type,
                       char *path, char *method, char *name)
{
        struct wps_context *wps = wpa_s->wps;
        struct oob_device_data *oob_dev;

        oob_dev = wps_get_oob_device(device_type);
        if (oob_dev == NULL)
                return -1;
        oob_dev->device_path = path;
        oob_dev->device_name = name;
        wps->oob_conf.oob_method = wps_get_oob_method(method);

        if (wps->oob_conf.oob_method == OOB_METHOD_DEV_PWD_E) {
                /*
                 * Use pre-configured DH keys in order to be able to write the
                 * key hash into the OOB file.
                 */
                wpabuf_free(wps->dh_pubkey);
                wpabuf_free(wps->dh_privkey);
                wps->dh_privkey = NULL;
                wps->dh_pubkey = NULL;
                dh5_free(wps->dh_ctx);
                wps->dh_ctx = dh5_init(&wps->dh_privkey, &wps->dh_pubkey);
                wps->dh_pubkey = wpabuf_zeropad(wps->dh_pubkey, 192);
                if (wps->dh_ctx == NULL || wps->dh_pubkey == NULL) {
                        wpa_printf(MSG_ERROR, "WPS: Failed to initialize "
                                   "Diffie-Hellman handshake");
                        return -1;
                }
        }

        if (wps->oob_conf.oob_method == OOB_METHOD_CRED)
                wpas_clear_wps(wpa_s);

        if (wps_process_oob(wps, oob_dev, 0) < 0)
                return -1;

        if ((wps->oob_conf.oob_method == OOB_METHOD_DEV_PWD_E ||
             wps->oob_conf.oob_method == OOB_METHOD_DEV_PWD_R) &&
            wpas_wps_start_pin(wpa_s, NULL,
                               wpabuf_head(wps->oob_conf.dev_password)) < 0)
                        return -1;

        return 0;
}
#endif /* CONFIG_WPS_OOB */


int wpas_wps_start_reg(struct wpa_supplicant *wpa_s, const u8 *bssid,
                       const char *pin, struct wps_new_ap_settings *settings)
{
        struct wpa_ssid *ssid;
        char val[200];
        char *pos, *end;
        int res;

        if (!pin)
                return -1;
        wpas_clear_wps(wpa_s);
        ssid = wpas_wps_add_network(wpa_s, 1, bssid);
        if (ssid == NULL)
                return -1;
        pos = val;
        end = pos + sizeof(val);
        res = os_snprintf(pos, end - pos, "\"pin=%s", pin);
        if (res < 0 || res >= end - pos)
                return -1;
        pos += res;
        if (settings) {
                res = os_snprintf(pos, end - pos, " new_ssid=%s new_auth=%s "
                                  "new_encr=%s new_key=%s",
                                  settings->ssid_hex, settings->auth,
                                  settings->encr, settings->key_hex);
                if (res < 0 || res >= end - pos)
                        return -1;
                pos += res;
        }
        res = os_snprintf(pos, end - pos, "\"");
        if (res < 0 || res >= end - pos)
                return -1;
        wpa_config_set(ssid, "phase1", val, 0);
        eloop_register_timeout(WPS_PBC_WALK_TIME, 0, wpas_wps_timeout,
                               wpa_s, NULL);
        wpas_wps_reassoc(wpa_s, ssid);
        return 0;
}


static int wpas_wps_new_psk_cb(void *ctx, const u8 *mac_addr, const u8 *psk,
                               size_t psk_len)
{
        wpa_printf(MSG_DEBUG, "WPS: Received new WPA/WPA2-PSK from WPS for "
                   "STA " MACSTR, MAC2STR(mac_addr));
        wpa_hexdump_key(MSG_DEBUG, "Per-device PSK", psk, psk_len);

        /* TODO */

        return 0;
}


static void wpas_wps_pin_needed_cb(void *ctx, const u8 *uuid_e,
                                   const struct wps_device_data *dev)
{
        char uuid[40], txt[400];
        int len;
        char devtype[WPS_DEV_TYPE_BUFSIZE];
        if (uuid_bin2str(uuid_e, uuid, sizeof(uuid)))
                return;
        wpa_printf(MSG_DEBUG, "WPS: PIN needed for UUID-E %s", uuid);
        len = os_snprintf(txt, sizeof(txt), "WPS-EVENT-PIN-NEEDED %s " MACSTR
                          " [%s|%s|%s|%s|%s|%s]",
                          uuid, MAC2STR(dev->mac_addr), dev->device_name,
                          dev->manufacturer, dev->model_name,
                          dev->model_number, dev->serial_number,
                          wps_dev_type_bin2str(dev->pri_dev_type, devtype,
                                               sizeof(devtype)));
        if (len > 0 && len < (int) sizeof(txt))
                wpa_printf(MSG_INFO, "%s", txt);
}


static void wpas_wps_set_sel_reg_cb(void *ctx, int sel_reg, u16 dev_passwd_id,
                                    u16 sel_reg_config_methods)
{
#ifdef CONFIG_WPS_ER
        struct wpa_supplicant *wpa_s = ctx;

        if (wpa_s->wps_er == NULL)
                return;
        wps_er_set_sel_reg(wpa_s->wps_er, sel_reg, dev_passwd_id,
                           sel_reg_config_methods);
#endif /* CONFIG_WPS_ER */
}


int wpas_wps_init(struct wpa_supplicant *wpa_s)
{
        struct wps_context *wps;
        struct wps_registrar_config rcfg;

        wps = os_zalloc(sizeof(*wps));
        if (wps == NULL)
                return -1;

        wps->cred_cb = wpa_supplicant_wps_cred;
        wps->event_cb = wpa_supplicant_wps_event;
        wps->cb_ctx = wpa_s;

        wps->dev.device_name = wpa_s->conf->device_name;
        wps->dev.manufacturer = wpa_s->conf->manufacturer;
        wps->dev.model_name = wpa_s->conf->model_name;
        wps->dev.model_number = wpa_s->conf->model_number;
        wps->dev.serial_number = wpa_s->conf->serial_number;
        wps->config_methods =
                wps_config_methods_str2bin(wpa_s->conf->config_methods);
        if (wpa_s->conf->device_type &&
            wps_dev_type_str2bin(wpa_s->conf->device_type,
                                 wps->dev.pri_dev_type) < 0) {
                wpa_printf(MSG_ERROR, "WPS: Invalid device_type");
                os_free(wps);
                return -1;
        }
        wps->dev.os_version = WPA_GET_BE32(wpa_s->conf->os_version);
        wps->dev.rf_bands = WPS_RF_24GHZ | WPS_RF_50GHZ; /* TODO: config */
        os_memcpy(wps->dev.mac_addr, wpa_s->own_addr, ETH_ALEN);
        if (is_nil_uuid(wpa_s->conf->uuid)) {
                uuid_gen_mac_addr(wpa_s->own_addr, wps->uuid);
                wpa_hexdump(MSG_DEBUG, "WPS: UUID based on MAC address",
                            wps->uuid, WPS_UUID_LEN);
        } else
                os_memcpy(wps->uuid, wpa_s->conf->uuid, WPS_UUID_LEN);

        wps->auth_types = WPS_AUTH_WPA2PSK | WPS_AUTH_WPAPSK;
        wps->encr_types = WPS_ENCR_AES | WPS_ENCR_TKIP;

        os_memset(&rcfg, 0, sizeof(rcfg));
        rcfg.new_psk_cb = wpas_wps_new_psk_cb;
        rcfg.pin_needed_cb = wpas_wps_pin_needed_cb;
        rcfg.set_sel_reg_cb = wpas_wps_set_sel_reg_cb;
        rcfg.cb_ctx = wpa_s;

        wps->registrar = wps_registrar_init(wps, &rcfg);
        if (wps->registrar == NULL) {
                wpa_printf(MSG_DEBUG, "Failed to initialize WPS Registrar");
                os_free(wps);
                return -1;
        }

        wpa_s->wps = wps;

        return 0;
}


void wpas_wps_deinit(struct wpa_supplicant *wpa_s)
{
        eloop_cancel_timeout(wpas_wps_timeout, wpa_s, NULL);

        if (wpa_s->wps == NULL)
                return;

#ifdef CONFIG_WPS_ER
        wps_er_deinit(wpa_s->wps_er, NULL, NULL);
        wpa_s->wps_er = NULL;
#endif /* CONFIG_WPS_ER */

        wps_registrar_deinit(wpa_s->wps->registrar);
        wpabuf_free(wpa_s->wps->dh_pubkey);
        wpabuf_free(wpa_s->wps->dh_privkey);
        wpabuf_free(wpa_s->wps->oob_conf.pubkey_hash);
        wpabuf_free(wpa_s->wps->oob_conf.dev_password);
        os_free(wpa_s->wps->network_key);
        os_free(wpa_s->wps);
        wpa_s->wps = NULL;
}


int wpas_wps_ssid_bss_match(struct wpa_supplicant *wpa_s,
                            struct wpa_ssid *ssid, struct wpa_scan_res *bss)
{
        struct wpabuf *wps_ie;

        if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
                return -1;

        wps_ie = wpa_scan_get_vendor_ie_multi(bss, WPS_IE_VENDOR_TYPE);
        if (eap_is_wps_pbc_enrollee(&ssid->eap)) {
                if (!wps_ie) {
                        wpa_printf(MSG_DEBUG, "   skip - non-WPS AP");
                        return 0;
                }

                if (!wps_is_selected_pbc_registrar(wps_ie)) {
                        wpa_printf(MSG_DEBUG, "   skip - WPS AP "
                                   "without active PBC Registrar");
                        wpabuf_free(wps_ie);
                        return 0;
                }

                /* TODO: overlap detection */
                wpa_printf(MSG_DEBUG, "   selected based on WPS IE "
                           "(Active PBC)");
                wpabuf_free(wps_ie);
                return 1;
        }

        if (eap_is_wps_pin_enrollee(&ssid->eap)) {
                if (!wps_ie) {
                        wpa_printf(MSG_DEBUG, "   skip - non-WPS AP");
                        return 0;
                }

                /*
                 * Start with WPS APs that advertise active PIN Registrar and
                 * allow any WPS AP after third scan since some APs do not set
                 * Selected Registrar attribute properly when using external
                 * Registrar.
                 */
                if (!wps_is_selected_pin_registrar(wps_ie)) {
                        if (wpa_s->scan_runs < WPS_PIN_SCAN_IGNORE_SEL_REG) {
                                wpa_printf(MSG_DEBUG, "   skip - WPS AP "
                                           "without active PIN Registrar");
                                wpabuf_free(wps_ie);
                                return 0;
                        }
                        wpa_printf(MSG_DEBUG, "   selected based on WPS IE");
                } else {
                        wpa_printf(MSG_DEBUG, "   selected based on WPS IE "
                                   "(Active PIN)");
                }
                wpabuf_free(wps_ie);
                return 1;
        }

        if (wps_ie) {
                wpa_printf(MSG_DEBUG, "   selected based on WPS IE");
                wpabuf_free(wps_ie);
                return 1;
        }

        return -1;
}


int wpas_wps_ssid_wildcard_ok(struct wpa_supplicant *wpa_s,
                              struct wpa_ssid *ssid,
                              struct wpa_scan_res *bss)
{
        struct wpabuf *wps_ie = NULL;
        int ret = 0;

        if (eap_is_wps_pbc_enrollee(&ssid->eap)) {
                wps_ie = wpa_scan_get_vendor_ie_multi(bss, WPS_IE_VENDOR_TYPE);
                if (wps_ie && wps_is_selected_pbc_registrar(wps_ie)) {
                        /* allow wildcard SSID for WPS PBC */
                        ret = 1;
                }
        } else if (eap_is_wps_pin_enrollee(&ssid->eap)) {
                wps_ie = wpa_scan_get_vendor_ie_multi(bss, WPS_IE_VENDOR_TYPE);
                if (wps_ie &&
                    (wps_is_selected_pin_registrar(wps_ie) ||
                     wpa_s->scan_runs >= WPS_PIN_SCAN_IGNORE_SEL_REG)) {
                        /* allow wildcard SSID for WPS PIN */
                        ret = 1;
                }
        }

        if (!ret && ssid->bssid_set &&
            os_memcmp(ssid->bssid, bss->bssid, ETH_ALEN) == 0) {
                /* allow wildcard SSID due to hardcoded BSSID match */
                ret = 1;
        }

        wpabuf_free(wps_ie);

        return ret;
}


int wpas_wps_scan_pbc_overlap(struct wpa_supplicant *wpa_s,
                              struct wpa_bss *selected, struct wpa_ssid *ssid)
{
        const u8 *sel_uuid, *uuid;
        struct wpabuf *wps_ie;
        int ret = 0;
        struct wpa_bss *bss;

        if (!eap_is_wps_pbc_enrollee(&ssid->eap))
                return 0;

        /* Make sure that only one AP is in active PBC mode */
        wps_ie = wpa_bss_get_vendor_ie_multi(selected, WPS_IE_VENDOR_TYPE);
        if (wps_ie)
                sel_uuid = wps_get_uuid_e(wps_ie);
        else
                sel_uuid = NULL;

        dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
                struct wpabuf *ie;
                if (bss == selected)
                        continue;
                ie = wpa_bss_get_vendor_ie_multi(bss, WPS_IE_VENDOR_TYPE);
                if (!ie)
                        continue;
                if (!wps_is_selected_pbc_registrar(ie)) {
                        wpabuf_free(ie);
                        continue;
                }
                uuid = wps_get_uuid_e(ie);
                if (sel_uuid == NULL || uuid == NULL ||
                    os_memcmp(sel_uuid, uuid, 16) != 0) {
                        ret = 1; /* PBC overlap */
                        wpabuf_free(ie);
                        break;
                }

                /* TODO: verify that this is reasonable dual-band situation */

                wpabuf_free(ie);
        }

        wpabuf_free(wps_ie);

        return ret;
}


void wpas_wps_notify_scan_results(struct wpa_supplicant *wpa_s)
{
        struct wpa_bss *bss;

        if (wpa_s->disconnected || wpa_s->wpa_state >= WPA_ASSOCIATED)
                return;

        dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
                struct wpabuf *ie;
                ie = wpa_bss_get_vendor_ie_multi(bss, WPS_IE_VENDOR_TYPE);
                if (!ie)
                        continue;
                if (wps_is_selected_pbc_registrar(ie))
                        wpa_msg_ctrl(wpa_s, MSG_INFO,
                                     WPS_EVENT_AP_AVAILABLE_PBC);
                else if (wps_is_selected_pin_registrar(ie))
                        wpa_msg_ctrl(wpa_s, MSG_INFO,
                                     WPS_EVENT_AP_AVAILABLE_PIN);
                else
                        wpa_msg_ctrl(wpa_s, MSG_INFO,
                                     WPS_EVENT_AP_AVAILABLE);
                wpabuf_free(ie);
                break;
        }
}


int wpas_wps_searching(struct wpa_supplicant *wpa_s)
{
        struct wpa_ssid *ssid;

        for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
                if ((ssid->key_mgmt & WPA_KEY_MGMT_WPS) && !ssid->disabled)
                        return 1;
        }

        return 0;
}


int wpas_wps_scan_result_text(const u8 *ies, size_t ies_len, char *buf,
                              char *end)
{
        struct wpabuf *wps_ie;
        int ret;

        wps_ie = ieee802_11_vendor_ie_concat(ies, ies_len, WPS_DEV_OUI_WFA);
        if (wps_ie == NULL)
                return 0;

        ret = wps_attr_text(wps_ie, buf, end);
        wpabuf_free(wps_ie);
        return ret;
}


int wpas_wps_er_start(struct wpa_supplicant *wpa_s)
{
#ifdef CONFIG_WPS_ER
        if (wpa_s->wps_er) {
                wps_er_refresh(wpa_s->wps_er);
                return 0;
        }
        wpa_s->wps_er = wps_er_init(wpa_s->wps, wpa_s->ifname);
        if (wpa_s->wps_er == NULL)
                return -1;
        return 0;
#else /* CONFIG_WPS_ER */
        return 0;
#endif /* CONFIG_WPS_ER */
}


int wpas_wps_er_stop(struct wpa_supplicant *wpa_s)
{
#ifdef CONFIG_WPS_ER
        wps_er_deinit(wpa_s->wps_er, NULL, NULL);
        wpa_s->wps_er = NULL;
#endif /* CONFIG_WPS_ER */
        return 0;
}


#ifdef CONFIG_WPS_ER
int wpas_wps_er_add_pin(struct wpa_supplicant *wpa_s, const char *uuid,
                        const char *pin)
{
        u8 u[UUID_LEN];
        int any = 0;

        if (os_strcmp(uuid, "any") == 0)
                any = 1;
        else if (uuid_str2bin(uuid, u))
                return -1;
        return wps_registrar_add_pin(wpa_s->wps->registrar, any ? NULL : u,
                                     (const u8 *) pin, os_strlen(pin), 300);
}


int wpas_wps_er_pbc(struct wpa_supplicant *wpa_s, const char *uuid)
{
        u8 u[UUID_LEN];

        if (uuid_str2bin(uuid, u))
                return -1;
        return wps_er_pbc(wpa_s->wps_er, u);
}


int wpas_wps_er_learn(struct wpa_supplicant *wpa_s, const char *uuid,
                      const char *pin)
{
        u8 u[UUID_LEN];

        if (uuid_str2bin(uuid, u))
                return -1;
        return wps_er_learn(wpa_s->wps_er, u, (const u8 *) pin,
                            os_strlen(pin));
}


static void wpas_wps_terminate_cb(void *ctx)
{
        wpa_printf(MSG_DEBUG, "WPS ER: Terminated");
        eloop_terminate();
}
#endif /* CONFIG_WPS_ER */


int wpas_wps_terminate_pending(struct wpa_supplicant *wpa_s)
{
#ifdef CONFIG_WPS_ER
        if (wpa_s->wps_er) {
                wps_er_deinit(wpa_s->wps_er, wpas_wps_terminate_cb, wpa_s);
                wpa_s->wps_er = NULL;
                return 1;
        }
#endif /* CONFIG_WPS_ER */
        return 0;
}