wpa_auth_glue.c

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/*
 * hostapd / WPA authenticator glue code
 * Copyright (c) 2002-2009, 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 "utils/includes.h"

#include "utils/common.h"
#include "common/ieee802_11_defs.h"
#include "eapol_auth/eapol_auth_sm.h"
#include "eapol_auth/eapol_auth_sm_i.h"
#include "eap_server/eap.h"
#include "l2_packet/l2_packet.h"
#include "drivers/driver.h"
#include "hostapd.h"
#include "ieee802_1x.h"
#include "preauth_auth.h"
#include "sta_info.h"
#include "tkip_countermeasures.h"
#include "ap_drv_ops.h"
#include "ap_config.h"
#include "wpa_auth.h"


static void hostapd_wpa_auth_conf(struct hostapd_bss_config *conf,
                                  struct wpa_auth_config *wconf)
{
        wconf->wpa = conf->wpa;
        wconf->wpa_key_mgmt = conf->wpa_key_mgmt;
        wconf->wpa_pairwise = conf->wpa_pairwise;
        wconf->wpa_group = conf->wpa_group;
        wconf->wpa_group_rekey = conf->wpa_group_rekey;
        wconf->wpa_strict_rekey = conf->wpa_strict_rekey;
        wconf->wpa_gmk_rekey = conf->wpa_gmk_rekey;
        wconf->wpa_ptk_rekey = conf->wpa_ptk_rekey;
        wconf->rsn_pairwise = conf->rsn_pairwise;
        wconf->rsn_preauth = conf->rsn_preauth;
        wconf->eapol_version = conf->eapol_version;
        wconf->peerkey = conf->peerkey;
        wconf->wmm_enabled = conf->wmm_enabled;
        wconf->wmm_uapsd = conf->wmm_uapsd;
        wconf->okc = conf->okc;
#ifdef CONFIG_IEEE80211W
        wconf->ieee80211w = conf->ieee80211w;
#endif /* CONFIG_IEEE80211W */
#ifdef CONFIG_IEEE80211R
        wconf->ssid_len = conf->ssid.ssid_len;
        if (wconf->ssid_len > SSID_LEN)
                wconf->ssid_len = SSID_LEN;
        os_memcpy(wconf->ssid, conf->ssid.ssid, wconf->ssid_len);
        os_memcpy(wconf->mobility_domain, conf->mobility_domain,
                  MOBILITY_DOMAIN_ID_LEN);
        if (conf->nas_identifier &&
            os_strlen(conf->nas_identifier) <= FT_R0KH_ID_MAX_LEN) {
                wconf->r0_key_holder_len = os_strlen(conf->nas_identifier);
                os_memcpy(wconf->r0_key_holder, conf->nas_identifier,
                          wconf->r0_key_holder_len);
        }
        os_memcpy(wconf->r1_key_holder, conf->r1_key_holder, FT_R1KH_ID_LEN);
        wconf->r0_key_lifetime = conf->r0_key_lifetime;
        wconf->reassociation_deadline = conf->reassociation_deadline;
        wconf->r0kh_list = conf->r0kh_list;
        wconf->r1kh_list = conf->r1kh_list;
        wconf->pmk_r1_push = conf->pmk_r1_push;
#endif /* CONFIG_IEEE80211R */
}


static void hostapd_wpa_auth_logger(void *ctx, const u8 *addr,
                                    logger_level level, const char *txt)
{
#ifndef CONFIG_NO_HOSTAPD_LOGGER
        struct hostapd_data *hapd = ctx;
        int hlevel;

        switch (level) {
        case LOGGER_WARNING:
                hlevel = HOSTAPD_LEVEL_WARNING;
                break;
        case LOGGER_INFO:
                hlevel = HOSTAPD_LEVEL_INFO;
                break;
        case LOGGER_DEBUG:
        default:
                hlevel = HOSTAPD_LEVEL_DEBUG;
                break;
        }

        hostapd_logger(hapd, addr, HOSTAPD_MODULE_WPA, hlevel, "%s", txt);
#endif /* CONFIG_NO_HOSTAPD_LOGGER */
}


static void hostapd_wpa_auth_disconnect(void *ctx, const u8 *addr,
                                        u16 reason)
{
        struct hostapd_data *hapd = ctx;
        wpa_printf(MSG_DEBUG, "%s: WPA authenticator requests disconnect: "
                   "STA " MACSTR " reason %d",
                   __func__, MAC2STR(addr), reason);
        ap_sta_disconnect(hapd, NULL, addr, reason);
}


static void hostapd_wpa_auth_mic_failure_report(void *ctx, const u8 *addr)
{
        struct hostapd_data *hapd = ctx;
        michael_mic_failure(hapd, addr, 0);
}


static void hostapd_wpa_auth_set_eapol(void *ctx, const u8 *addr,
                                       wpa_eapol_variable var, int value)
{
        struct hostapd_data *hapd = ctx;
        struct sta_info *sta = ap_get_sta(hapd, addr);
        if (sta == NULL)
                return;
        switch (var) {
        case WPA_EAPOL_portEnabled:
                ieee802_1x_notify_port_enabled(sta->eapol_sm, value);
                break;
        case WPA_EAPOL_portValid:
                ieee802_1x_notify_port_valid(sta->eapol_sm, value);
                break;
        case WPA_EAPOL_authorized:
                ieee802_1x_set_sta_authorized(hapd, sta, value);
                break;
        case WPA_EAPOL_portControl_Auto:
                if (sta->eapol_sm)
                        sta->eapol_sm->portControl = Auto;
                break;
        case WPA_EAPOL_keyRun:
                if (sta->eapol_sm)
                        sta->eapol_sm->keyRun = value ? TRUE : FALSE;
                break;
        case WPA_EAPOL_keyAvailable:
                if (sta->eapol_sm)
                        sta->eapol_sm->eap_if->eapKeyAvailable =
                                value ? TRUE : FALSE;
                break;
        case WPA_EAPOL_keyDone:
                if (sta->eapol_sm)
                        sta->eapol_sm->keyDone = value ? TRUE : FALSE;
                break;
        case WPA_EAPOL_inc_EapolFramesTx:
                if (sta->eapol_sm)
                        sta->eapol_sm->dot1xAuthEapolFramesTx++;
                break;
        }
}


static int hostapd_wpa_auth_get_eapol(void *ctx, const u8 *addr,
                                      wpa_eapol_variable var)
{
        struct hostapd_data *hapd = ctx;
        struct sta_info *sta = ap_get_sta(hapd, addr);
        if (sta == NULL || sta->eapol_sm == NULL)
                return -1;
        switch (var) {
        case WPA_EAPOL_keyRun:
                return sta->eapol_sm->keyRun;
        case WPA_EAPOL_keyAvailable:
                return sta->eapol_sm->eap_if->eapKeyAvailable;
        default:
                return -1;
        }
}


static const u8 * hostapd_wpa_auth_get_psk(void *ctx, const u8 *addr,
                                           const u8 *prev_psk)
{
        struct hostapd_data *hapd = ctx;
        return hostapd_get_psk(hapd->conf, addr, prev_psk);
}


static int hostapd_wpa_auth_get_msk(void *ctx, const u8 *addr, u8 *msk,
                                    size_t *len)
{
        struct hostapd_data *hapd = ctx;
        const u8 *key;
        size_t keylen;
        struct sta_info *sta;

        sta = ap_get_sta(hapd, addr);
        if (sta == NULL)
                return -1;

        key = ieee802_1x_get_key(sta->eapol_sm, &keylen);
        if (key == NULL)
                return -1;

        if (keylen > *len)
                keylen = *len;
        os_memcpy(msk, key, keylen);
        *len = keylen;

        return 0;
}


static int hostapd_wpa_auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg,
                                    const u8 *addr, int idx, u8 *key,
                                    size_t key_len)
{
        struct hostapd_data *hapd = ctx;
        const char *ifname = hapd->conf->iface;

        if (vlan_id > 0) {
                ifname = hostapd_get_vlan_id_ifname(hapd->conf->vlan, vlan_id);
                if (ifname == NULL)
                        return -1;
        }

        return hapd->drv.set_key(ifname, hapd, alg, addr, idx, 1, NULL, 0,
                                 key, key_len);
}


static int hostapd_wpa_auth_get_seqnum(void *ctx, const u8 *addr, int idx,
                                       u8 *seq)
{
        struct hostapd_data *hapd = ctx;
        return hostapd_get_seqnum(hapd->conf->iface, hapd, addr, idx, seq);
}


static int hostapd_wpa_auth_send_eapol(void *ctx, const u8 *addr,
                                       const u8 *data, size_t data_len,
                                       int encrypt)
{
        struct hostapd_data *hapd = ctx;
        return hapd->drv.send_eapol(hapd, addr, data, data_len, encrypt);
}


static int hostapd_wpa_auth_for_each_sta(
        void *ctx, int (*cb)(struct wpa_state_machine *sm, void *ctx),
        void *cb_ctx)
{
        struct hostapd_data *hapd = ctx;
        struct sta_info *sta;

        for (sta = hapd->sta_list; sta; sta = sta->next) {
                if (sta->wpa_sm && cb(sta->wpa_sm, cb_ctx))
                        return 1;
        }
        return 0;
}


struct wpa_auth_iface_iter_data {
        int (*cb)(struct wpa_authenticator *sm, void *ctx);
        void *cb_ctx;
};

static int wpa_auth_iface_iter(struct hostapd_iface *iface, void *ctx)
{
        struct wpa_auth_iface_iter_data *data = ctx;
        size_t i;
        for (i = 0; i < iface->num_bss; i++) {
                if (iface->bss[i]->wpa_auth &&
                    data->cb(iface->bss[i]->wpa_auth, data->cb_ctx))
                        return 1;
        }
        return 0;
}


static int hostapd_wpa_auth_for_each_auth(
        void *ctx, int (*cb)(struct wpa_authenticator *sm, void *ctx),
        void *cb_ctx)
{
        struct hostapd_data *hapd = ctx;
        struct wpa_auth_iface_iter_data data;
        if (hapd->iface->for_each_interface == NULL)
                return -1;
        data.cb = cb;
        data.cb_ctx = cb_ctx;
        return hapd->iface->for_each_interface(hapd->iface->interfaces,
                                               wpa_auth_iface_iter, &data);
}


static int hostapd_wpa_auth_send_ether(void *ctx, const u8 *dst, u16 proto,
                                       const u8 *data, size_t data_len)
{
        struct hostapd_data *hapd = ctx;

        if (hapd->driver && hapd->driver->send_ether)
                return hapd->driver->send_ether(hapd->drv_priv, dst,
                                                hapd->own_addr, proto,
                                                data, data_len);
        if (hapd->l2 == NULL)
                return -1;
        return l2_packet_send(hapd->l2, dst, proto, data, data_len);
}


#ifdef CONFIG_IEEE80211R

static int hostapd_wpa_auth_send_ft_action(void *ctx, const u8 *dst,
                                           const u8 *data, size_t data_len)
{
        struct hostapd_data *hapd = ctx;
        int res;
        struct ieee80211_mgmt *m;
        size_t mlen;
        struct sta_info *sta;

        sta = ap_get_sta(hapd, dst);
        if (sta == NULL || sta->wpa_sm == NULL)
                return -1;

        m = os_zalloc(sizeof(*m) + data_len);
        if (m == NULL)
                return -1;
        mlen = ((u8 *) &m->u - (u8 *) m) + data_len;
        m->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
                                        WLAN_FC_STYPE_ACTION);
        os_memcpy(m->da, dst, ETH_ALEN);
        os_memcpy(m->sa, hapd->own_addr, ETH_ALEN);
        os_memcpy(m->bssid, hapd->own_addr, ETH_ALEN);
        os_memcpy(&m->u, data, data_len);

        res = hapd->drv.send_mgmt_frame(hapd, (u8 *) m, mlen);
        os_free(m);
        return res;
}


static struct wpa_state_machine *
hostapd_wpa_auth_add_sta(void *ctx, const u8 *sta_addr)
{
        struct hostapd_data *hapd = ctx;
        struct sta_info *sta;

        sta = ap_sta_add(hapd, sta_addr);
        if (sta == NULL)
                return NULL;
        if (sta->wpa_sm) {
                sta->auth_alg = WLAN_AUTH_FT;
                return sta->wpa_sm;
        }

        sta->wpa_sm = wpa_auth_sta_init(hapd->wpa_auth, sta->addr);
        if (sta->wpa_sm == NULL) {
                ap_free_sta(hapd, sta);
                return NULL;
        }
        sta->auth_alg = WLAN_AUTH_FT;

        return sta->wpa_sm;
}


static void hostapd_rrb_receive(void *ctx, const u8 *src_addr, const u8 *buf,
                                size_t len)
{
        struct hostapd_data *hapd = ctx;
        wpa_ft_rrb_rx(hapd->wpa_auth, src_addr, buf, len);
}

#endif /* CONFIG_IEEE80211R */


int hostapd_setup_wpa(struct hostapd_data *hapd)
{
        struct wpa_auth_config _conf;
        struct wpa_auth_callbacks cb;
        const u8 *wpa_ie;
        size_t wpa_ie_len;

        hostapd_wpa_auth_conf(hapd->conf, &_conf);
        os_memset(&cb, 0, sizeof(cb));
        cb.ctx = hapd;
        cb.logger = hostapd_wpa_auth_logger;
        cb.disconnect = hostapd_wpa_auth_disconnect;
        cb.mic_failure_report = hostapd_wpa_auth_mic_failure_report;
        cb.set_eapol = hostapd_wpa_auth_set_eapol;
        cb.get_eapol = hostapd_wpa_auth_get_eapol;
        cb.get_psk = hostapd_wpa_auth_get_psk;
        cb.get_msk = hostapd_wpa_auth_get_msk;
        cb.set_key = hostapd_wpa_auth_set_key;
        cb.get_seqnum = hostapd_wpa_auth_get_seqnum;
        cb.send_eapol = hostapd_wpa_auth_send_eapol;
        cb.for_each_sta = hostapd_wpa_auth_for_each_sta;
        cb.for_each_auth = hostapd_wpa_auth_for_each_auth;
        cb.send_ether = hostapd_wpa_auth_send_ether;
#ifdef CONFIG_IEEE80211R
        cb.send_ft_action = hostapd_wpa_auth_send_ft_action;
        cb.add_sta = hostapd_wpa_auth_add_sta;
#endif /* CONFIG_IEEE80211R */
        hapd->wpa_auth = wpa_init(hapd->own_addr, &_conf, &cb);
        if (hapd->wpa_auth == NULL) {
                wpa_printf(MSG_ERROR, "WPA initialization failed.");
                return -1;
        }

        if (hostapd_set_privacy(hapd, 1)) {
                wpa_printf(MSG_ERROR, "Could not set PrivacyInvoked "
                           "for interface %s", hapd->conf->iface);
                return -1;
        }

        wpa_ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &wpa_ie_len);
        if (hostapd_set_generic_elem(hapd, wpa_ie, wpa_ie_len)) {
                wpa_printf(MSG_ERROR, "Failed to configure WPA IE for "
                           "the kernel driver.");
                return -1;
        }

        if (rsn_preauth_iface_init(hapd)) {
                wpa_printf(MSG_ERROR, "Initialization of RSN "
                           "pre-authentication failed.");
                return -1;
        }

#ifdef CONFIG_IEEE80211R
        if (!hostapd_drv_none(hapd)) {
                hapd->l2 = l2_packet_init(hapd->conf->bridge[0] ?
                                          hapd->conf->bridge :
                                          hapd->conf->iface, NULL, ETH_P_RRB,
                                          hostapd_rrb_receive, hapd, 0);
                if (hapd->l2 == NULL &&
                    (hapd->driver == NULL ||
                     hapd->driver->send_ether == NULL)) {
                        wpa_printf(MSG_ERROR, "Failed to open l2_packet "
                                   "interface");
                        return -1;
                }
        }
#endif /* CONFIG_IEEE80211R */

        return 0;

}


void hostapd_reconfig_wpa(struct hostapd_data *hapd)
{
        struct wpa_auth_config wpa_auth_conf;
        hostapd_wpa_auth_conf(hapd->conf, &wpa_auth_conf);
        wpa_reconfig(hapd->wpa_auth, &wpa_auth_conf);
}


void hostapd_deinit_wpa(struct hostapd_data *hapd)
{
        rsn_preauth_iface_deinit(hapd);
        if (hapd->wpa_auth) {
                wpa_deinit(hapd->wpa_auth);
                hapd->wpa_auth = NULL;

                if (hostapd_set_privacy(hapd, 0)) {
                        wpa_printf(MSG_DEBUG, "Could not disable "
                                   "PrivacyInvoked for interface %s",
                                   hapd->conf->iface);
                }

                if (hostapd_set_generic_elem(hapd, (u8 *) "", 0)) {
                        wpa_printf(MSG_DEBUG, "Could not remove generic "
                                   "information element from interface %s",
                                   hapd->conf->iface);
                }
        }
        ieee802_1x_deinit(hapd);

#ifdef CONFIG_IEEE80211R
        l2_packet_deinit(hapd->l2);
#endif /* CONFIG_IEEE80211R */
}