ieee802_1x.c

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#include "includes.h"

#include "hostapd.h"
#include "ieee802_1x.h"
#include "accounting.h"
#include "radius/radius.h"
#include "radius/radius_client.h"
#include "eapol_sm.h"
#include "md5.h"
#include "crypto.h"
#include "eloop.h"
#include "sta_info.h"
#include "wpa.h"
#include "preauth.h"
#include "pmksa_cache.h"
#include "driver_i.h"
#include "hw_features.h"
#include "eap_server/eap.h"
#include "ieee802_11_defs.h"
#include "wpa_ctrl.h"


static void ieee802_1x_finished(struct hostapd_data *hapd,
                                struct sta_info *sta, int success);


static void ieee802_1x_send(struct hostapd_data *hapd, struct sta_info *sta,
                            u8 type, const u8 *data, size_t datalen)
{
        u8 *buf;
        struct ieee802_1x_hdr *xhdr;
        size_t len;
        int encrypt = 0;

        len = sizeof(*xhdr) + datalen;
        buf = os_zalloc(len);
        if (buf == NULL) {
                wpa_printf(MSG_ERROR, "malloc() failed for "
                           "ieee802_1x_send(len=%lu)",
                           (unsigned long) len);
                return;
        }

        xhdr = (struct ieee802_1x_hdr *) buf;
        xhdr->version = hapd->conf->eapol_version;
        xhdr->type = type;
        xhdr->length = host_to_be16(datalen);

        if (datalen > 0 && data != NULL)
                os_memcpy(xhdr + 1, data, datalen);

        if (wpa_auth_pairwise_set(sta->wpa_sm))
                encrypt = 1;
        if (sta->flags & WLAN_STA_PREAUTH) {
                rsn_preauth_send(hapd, sta, buf, len);
        } else {
                hostapd_send_eapol(hapd, sta->addr, buf, len, encrypt);
        }

        os_free(buf);
}


void ieee802_1x_set_sta_authorized(struct hostapd_data *hapd,
                                   struct sta_info *sta, int authorized)
{
        int res;

        if (sta->flags & WLAN_STA_PREAUTH)
                return;

        if (authorized) {
                if (!(sta->flags & WLAN_STA_AUTHORIZED))
                        wpa_msg(hapd->msg_ctx, MSG_INFO,
                                AP_STA_CONNECTED MACSTR, MAC2STR(sta->addr));
                sta->flags |= WLAN_STA_AUTHORIZED;
                res = hostapd_sta_set_flags(hapd, sta->addr, sta->flags,
                                            WLAN_STA_AUTHORIZED, ~0);
                hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE8021X,
                               HOSTAPD_LEVEL_DEBUG, "authorizing port");
        } else {
                if ((sta->flags & (WLAN_STA_AUTHORIZED | WLAN_STA_ASSOC)) ==
                    (WLAN_STA_AUTHORIZED | WLAN_STA_ASSOC))
                        wpa_msg(hapd->msg_ctx, MSG_INFO,
                                AP_STA_DISCONNECTED MACSTR,
                                MAC2STR(sta->addr));
                sta->flags &= ~WLAN_STA_AUTHORIZED;
                res = hostapd_sta_set_flags(hapd, sta->addr, sta->flags,
                                            0, ~WLAN_STA_AUTHORIZED);
                hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE8021X,
                               HOSTAPD_LEVEL_DEBUG, "unauthorizing port");
        }

        if (res && errno != ENOENT) {
                printf("Could not set station " MACSTR " flags for kernel "
                       "driver (errno=%d).\n", MAC2STR(sta->addr), errno);
        }

        if (authorized)
                accounting_sta_start(hapd, sta);
}


static void ieee802_1x_tx_key_one(struct hostapd_data *hapd,
                                  struct sta_info *sta,
                                  int idx, int broadcast,
                                  u8 *key_data, size_t key_len)
{
        u8 *buf, *ekey;
        struct ieee802_1x_hdr *hdr;
        struct ieee802_1x_eapol_key *key;
        size_t len, ekey_len;
        struct eapol_state_machine *sm = sta->eapol_sm;

        if (sm == NULL)
                return;

        len = sizeof(*key) + key_len;
        buf = os_zalloc(sizeof(*hdr) + len);
        if (buf == NULL)
                return;

        hdr = (struct ieee802_1x_hdr *) buf;
        key = (struct ieee802_1x_eapol_key *) (hdr + 1);
        key->type = EAPOL_KEY_TYPE_RC4;
        key->key_length = htons(key_len);
        wpa_get_ntp_timestamp(key->replay_counter);

        if (os_get_random(key->key_iv, sizeof(key->key_iv))) {
                wpa_printf(MSG_ERROR, "Could not get random numbers");
                os_free(buf);
                return;
        }

        key->key_index = idx | (broadcast ? 0 : BIT(7));
        if (hapd->conf->eapol_key_index_workaround) {
                /* According to some information, WinXP Supplicant seems to
                 * interpret bit7 as an indication whether the key is to be
                 * activated, so make it possible to enable workaround that
                 * sets this bit for all keys. */
                key->key_index |= BIT(7);
        }

        /* Key is encrypted using "Key-IV + MSK[0..31]" as the RC4-key and
         * MSK[32..63] is used to sign the message. */
        if (sm->eap_if->eapKeyData == NULL || sm->eap_if->eapKeyDataLen < 64) {
                wpa_printf(MSG_ERROR, "No eapKeyData available for encrypting "
                           "and signing EAPOL-Key");
                os_free(buf);
                return;
        }
        os_memcpy((u8 *) (key + 1), key_data, key_len);
        ekey_len = sizeof(key->key_iv) + 32;
        ekey = os_malloc(ekey_len);
        if (ekey == NULL) {
                wpa_printf(MSG_ERROR, "Could not encrypt key");
                os_free(buf);
                return;
        }
        os_memcpy(ekey, key->key_iv, sizeof(key->key_iv));
        os_memcpy(ekey + sizeof(key->key_iv), sm->eap_if->eapKeyData, 32);
        rc4_skip(ekey, ekey_len, 0, (u8 *) (key + 1), key_len);
        os_free(ekey);

        /* This header is needed here for HMAC-MD5, but it will be regenerated
         * in ieee802_1x_send() */
        hdr->version = hapd->conf->eapol_version;
        hdr->type = IEEE802_1X_TYPE_EAPOL_KEY;
        hdr->length = host_to_be16(len);
        hmac_md5(sm->eap_if->eapKeyData + 32, 32, buf, sizeof(*hdr) + len,
                 key->key_signature);

        wpa_printf(MSG_DEBUG, "IEEE 802.1X: Sending EAPOL-Key to " MACSTR
                   " (%s index=%d)", MAC2STR(sm->addr),
                   broadcast ? "broadcast" : "unicast", idx);
        ieee802_1x_send(hapd, sta, IEEE802_1X_TYPE_EAPOL_KEY, (u8 *) key, len);
        if (sta->eapol_sm)
                sta->eapol_sm->dot1xAuthEapolFramesTx++;
        os_free(buf);
}


#ifndef CONFIG_NO_VLAN
static struct hostapd_wep_keys *
ieee802_1x_group_alloc(struct hostapd_data *hapd, const char *ifname)
{
        struct hostapd_wep_keys *key;

        key = os_zalloc(sizeof(*key));
        if (key == NULL)
                return NULL;

        key->default_len = hapd->conf->default_wep_key_len;

        if (key->idx >= hapd->conf->broadcast_key_idx_max ||
            key->idx < hapd->conf->broadcast_key_idx_min)
                key->idx = hapd->conf->broadcast_key_idx_min;
        else
                key->idx++;

        if (!key->key[key->idx])
                key->key[key->idx] = os_malloc(key->default_len);
        if (key->key[key->idx] == NULL ||
            os_get_random(key->key[key->idx], key->default_len)) {
                printf("Could not generate random WEP key (dynamic VLAN).\n");
                os_free(key->key[key->idx]);
                key->key[key->idx] = NULL;
                os_free(key);
                return NULL;
        }
        key->len[key->idx] = key->default_len;

        wpa_printf(MSG_DEBUG, "%s: Default WEP idx %d for dynamic VLAN\n",
                   ifname, key->idx);
        wpa_hexdump_key(MSG_DEBUG, "Default WEP key (dynamic VLAN)",
                        key->key[key->idx], key->len[key->idx]);

        if (hostapd_set_key(ifname, hapd, WPA_ALG_WEP, NULL, key->idx, 1,
                            NULL, 0, key->key[key->idx], key->len[key->idx]))
                printf("Could not set dynamic VLAN WEP encryption key.\n");

        hostapd_set_ieee8021x(ifname, hapd, 1);

        return key;
}


static struct hostapd_wep_keys *
ieee802_1x_get_group(struct hostapd_data *hapd, struct hostapd_ssid *ssid,
                     size_t vlan_id)
{
        const char *ifname;

        if (vlan_id == 0)
                return &ssid->wep;

        if (vlan_id <= ssid->max_dyn_vlan_keys && ssid->dyn_vlan_keys &&
            ssid->dyn_vlan_keys[vlan_id])
                return ssid->dyn_vlan_keys[vlan_id];

        wpa_printf(MSG_DEBUG, "IEEE 802.1X: Creating new group "
                   "state machine for VLAN ID %lu",
                   (unsigned long) vlan_id);

        ifname = hostapd_get_vlan_id_ifname(hapd->conf->vlan, vlan_id);
        if (ifname == NULL) {
                wpa_printf(MSG_DEBUG, "IEEE 802.1X: Unknown VLAN ID %lu - "
                           "cannot create group key state machine",
                           (unsigned long) vlan_id);
                return NULL;
        }

        if (ssid->dyn_vlan_keys == NULL) {
                int size = (vlan_id + 1) * sizeof(ssid->dyn_vlan_keys[0]);
                ssid->dyn_vlan_keys = os_zalloc(size);
                if (ssid->dyn_vlan_keys == NULL)
                        return NULL;
                ssid->max_dyn_vlan_keys = vlan_id;
        }

        if (ssid->max_dyn_vlan_keys < vlan_id) {
                struct hostapd_wep_keys **na;
                int size = (vlan_id + 1) * sizeof(ssid->dyn_vlan_keys[0]);
                na = os_realloc(ssid->dyn_vlan_keys, size);
                if (na == NULL)
                        return NULL;
                ssid->dyn_vlan_keys = na;
                os_memset(&ssid->dyn_vlan_keys[ssid->max_dyn_vlan_keys + 1], 0,
                          (vlan_id - ssid->max_dyn_vlan_keys) *
                          sizeof(ssid->dyn_vlan_keys[0]));
                ssid->max_dyn_vlan_keys = vlan_id;
        }

        ssid->dyn_vlan_keys[vlan_id] = ieee802_1x_group_alloc(hapd, ifname);

        return ssid->dyn_vlan_keys[vlan_id];
}
#endif /* CONFIG_NO_VLAN */


void ieee802_1x_tx_key(struct hostapd_data *hapd, struct sta_info *sta)
{
        struct eapol_authenticator *eapol = hapd->eapol_auth;
        struct eapol_state_machine *sm = sta->eapol_sm;
#ifndef CONFIG_NO_VLAN
        struct hostapd_wep_keys *key = NULL;
        int vlan_id;
#endif /* CONFIG_NO_VLAN */

        if (sm == NULL || !sm->eap_if->eapKeyData)
                return;

        wpa_printf(MSG_DEBUG, "IEEE 802.1X: Sending EAPOL-Key(s) to " MACSTR,
                   MAC2STR(sta->addr));

#ifndef CONFIG_NO_VLAN
        vlan_id = sta->vlan_id;
        if (vlan_id < 0 || vlan_id > MAX_VLAN_ID)
                vlan_id = 0;

        if (vlan_id) {
                key = ieee802_1x_get_group(hapd, sta->ssid, vlan_id);
                if (key && key->key[key->idx])
                        ieee802_1x_tx_key_one(hapd, sta, key->idx, 1,
                                              key->key[key->idx],
                                              key->len[key->idx]);
        } else
#endif /* CONFIG_NO_VLAN */
        if (eapol->default_wep_key) {
                ieee802_1x_tx_key_one(hapd, sta, eapol->default_wep_key_idx, 1,
                                      eapol->default_wep_key,
                                      hapd->conf->default_wep_key_len);
        }

        if (hapd->conf->individual_wep_key_len > 0) {
                u8 *ikey;
                ikey = os_malloc(hapd->conf->individual_wep_key_len);
                if (ikey == NULL ||
                    os_get_random(ikey, hapd->conf->individual_wep_key_len)) {
                        wpa_printf(MSG_ERROR, "Could not generate random "
                                   "individual WEP key.");
                        os_free(ikey);
                        return;
                }

                wpa_hexdump_key(MSG_DEBUG, "Individual WEP key",
                                ikey, hapd->conf->individual_wep_key_len);

                ieee802_1x_tx_key_one(hapd, sta, 0, 0, ikey,
                                      hapd->conf->individual_wep_key_len);

                /* TODO: set encryption in TX callback, i.e., only after STA
                 * has ACKed EAPOL-Key frame */
                if (hostapd_set_key(hapd->conf->iface, hapd, WPA_ALG_WEP,
                                    sta->addr, 0, 1, NULL, 0, ikey,
                                    hapd->conf->individual_wep_key_len)) {
                        wpa_printf(MSG_ERROR, "Could not set individual WEP "
                                   "encryption.");
                }

                os_free(ikey);
        }
}


const char *radius_mode_txt(struct hostapd_data *hapd)
{
        if (hapd->iface->current_mode == NULL)
                return "802.11";

        switch (hapd->iface->current_mode->mode) {
        case HOSTAPD_MODE_IEEE80211A:
                return "802.11a";
        case HOSTAPD_MODE_IEEE80211G:
                return "802.11g";
        case HOSTAPD_MODE_IEEE80211B:
        default:
                return "802.11b";
        }
}


int radius_sta_rate(struct hostapd_data *hapd, struct sta_info *sta)
{
        int i;
        u8 rate = 0;

        for (i = 0; i < sta->supported_rates_len; i++)
                if ((sta->supported_rates[i] & 0x7f) > rate)
                        rate = sta->supported_rates[i] & 0x7f;

        return rate;
}


#ifndef CONFIG_NO_RADIUS
static void ieee802_1x_learn_identity(struct hostapd_data *hapd,
                                      struct eapol_state_machine *sm,
                                      const u8 *eap, size_t len)
{
        const u8 *identity;
        size_t identity_len;

        if (len <= sizeof(struct eap_hdr) ||
            eap[sizeof(struct eap_hdr)] != EAP_TYPE_IDENTITY)
                return;

        identity = eap_get_identity(sm->eap, &identity_len);
        if (identity == NULL)
                return;

        /* Save station identity for future RADIUS packets */
        os_free(sm->identity);
        sm->identity = os_malloc(identity_len + 1);
        if (sm->identity == NULL) {
                sm->identity_len = 0;
                return;
        }

        os_memcpy(sm->identity, identity, identity_len);
        sm->identity_len = identity_len;
        sm->identity[identity_len] = '\0';
        hostapd_logger(hapd, sm->addr, HOSTAPD_MODULE_IEEE8021X,
                       HOSTAPD_LEVEL_DEBUG, "STA identity '%s'", sm->identity);
        sm->dot1xAuthEapolRespIdFramesRx++;
}


static void ieee802_1x_encapsulate_radius(struct hostapd_data *hapd,
                                          struct sta_info *sta,
                                          const u8 *eap, size_t len)
{
        struct radius_msg *msg;
        char buf[128];
        struct eapol_state_machine *sm = sta->eapol_sm;

        if (sm == NULL)
                return;

        ieee802_1x_learn_identity(hapd, sm, eap, len);

        wpa_printf(MSG_DEBUG, "Encapsulating EAP message into a RADIUS "
                   "packet");

        sm->radius_identifier = radius_client_get_id(hapd->radius);
        msg = radius_msg_new(RADIUS_CODE_ACCESS_REQUEST,
                             sm->radius_identifier);
        if (msg == NULL) {
                printf("Could not create net RADIUS packet\n");
                return;
        }

        radius_msg_make_authenticator(msg, (u8 *) sta, sizeof(*sta));

        if (sm->identity &&
            !radius_msg_add_attr(msg, RADIUS_ATTR_USER_NAME,
                                 sm->identity, sm->identity_len)) {
                printf("Could not add User-Name\n");
                goto fail;
        }

        if (hapd->conf->own_ip_addr.af == AF_INET &&
            !radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IP_ADDRESS,
                                 (u8 *) &hapd->conf->own_ip_addr.u.v4, 4)) {
                printf("Could not add NAS-IP-Address\n");
                goto fail;
        }

#ifdef CONFIG_IPV6
        if (hapd->conf->own_ip_addr.af == AF_INET6 &&
            !radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IPV6_ADDRESS,
                                 (u8 *) &hapd->conf->own_ip_addr.u.v6, 16)) {
                printf("Could not add NAS-IPv6-Address\n");
                goto fail;
        }
#endif /* CONFIG_IPV6 */

        if (hapd->conf->nas_identifier &&
            !radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IDENTIFIER,
                                 (u8 *) hapd->conf->nas_identifier,
                                 os_strlen(hapd->conf->nas_identifier))) {
                printf("Could not add NAS-Identifier\n");
                goto fail;
        }

        if (!radius_msg_add_attr_int32(msg, RADIUS_ATTR_NAS_PORT, sta->aid)) {
                printf("Could not add NAS-Port\n");
                goto fail;
        }

        os_snprintf(buf, sizeof(buf), RADIUS_802_1X_ADDR_FORMAT ":%s",
                    MAC2STR(hapd->own_addr), hapd->conf->ssid.ssid);
        buf[sizeof(buf) - 1] = '\0';
        if (!radius_msg_add_attr(msg, RADIUS_ATTR_CALLED_STATION_ID,
                                 (u8 *) buf, os_strlen(buf))) {
                printf("Could not add Called-Station-Id\n");
                goto fail;
        }

        os_snprintf(buf, sizeof(buf), RADIUS_802_1X_ADDR_FORMAT,
                    MAC2STR(sta->addr));
        buf[sizeof(buf) - 1] = '\0';
        if (!radius_msg_add_attr(msg, RADIUS_ATTR_CALLING_STATION_ID,
                                 (u8 *) buf, os_strlen(buf))) {
                printf("Could not add Calling-Station-Id\n");
                goto fail;
        }

        /* TODO: should probably check MTU from driver config; 2304 is max for
         * IEEE 802.11, but use 1400 to avoid problems with too large packets
         */
        if (!radius_msg_add_attr_int32(msg, RADIUS_ATTR_FRAMED_MTU, 1400)) {
                printf("Could not add Framed-MTU\n");
                goto fail;
        }

        if (!radius_msg_add_attr_int32(msg, RADIUS_ATTR_NAS_PORT_TYPE,
                                       RADIUS_NAS_PORT_TYPE_IEEE_802_11)) {
                printf("Could not add NAS-Port-Type\n");
                goto fail;
        }

        if (sta->flags & WLAN_STA_PREAUTH) {
                os_strlcpy(buf, "IEEE 802.11i Pre-Authentication",
                           sizeof(buf));
        } else {
                os_snprintf(buf, sizeof(buf), "CONNECT %d%sMbps %s",
                            radius_sta_rate(hapd, sta) / 2,
                            (radius_sta_rate(hapd, sta) & 1) ? ".5" : "",
                            radius_mode_txt(hapd));
                buf[sizeof(buf) - 1] = '\0';
        }
        if (!radius_msg_add_attr(msg, RADIUS_ATTR_CONNECT_INFO,
                                 (u8 *) buf, os_strlen(buf))) {
                printf("Could not add Connect-Info\n");
                goto fail;
        }

        if (eap && !radius_msg_add_eap(msg, eap, len)) {
                printf("Could not add EAP-Message\n");
                goto fail;
        }

        /* State attribute must be copied if and only if this packet is
         * Access-Request reply to the previous Access-Challenge */
        if (sm->last_recv_radius && sm->last_recv_radius->hdr->code ==
            RADIUS_CODE_ACCESS_CHALLENGE) {
                int res = radius_msg_copy_attr(msg, sm->last_recv_radius,
                                               RADIUS_ATTR_STATE);
                if (res < 0) {
                        printf("Could not copy State attribute from previous "
                               "Access-Challenge\n");
                        goto fail;
                }
                if (res > 0) {
                        wpa_printf(MSG_DEBUG, "Copied RADIUS State Attribute");
                }
        }

        radius_client_send(hapd->radius, msg, RADIUS_AUTH, sta->addr);
        return;

 fail:
        radius_msg_free(msg);
        os_free(msg);
}
#endif /* CONFIG_NO_RADIUS */


char *eap_type_text(u8 type)
{
        switch (type) {
        case EAP_TYPE_IDENTITY: return "Identity";
        case EAP_TYPE_NOTIFICATION: return "Notification";
        case EAP_TYPE_NAK: return "Nak";
        case EAP_TYPE_MD5: return "MD5-Challenge";
        case EAP_TYPE_OTP: return "One-Time Password";
        case EAP_TYPE_GTC: return "Generic Token Card";
        case EAP_TYPE_TLS: return "TLS";
        case EAP_TYPE_TTLS: return "TTLS";
        case EAP_TYPE_PEAP: return "PEAP";
        case EAP_TYPE_SIM: return "SIM";
        case EAP_TYPE_FAST: return "FAST";
        case EAP_TYPE_SAKE: return "SAKE";
        case EAP_TYPE_PSK: return "PSK";
        case EAP_TYPE_PAX: return "PAX";
        default: return "Unknown";
        }
}


static void handle_eap_response(struct hostapd_data *hapd,
                                struct sta_info *sta, struct eap_hdr *eap,
                                size_t len)
{
        u8 type, *data;
        struct eapol_state_machine *sm = sta->eapol_sm;
        if (sm == NULL)
                return;

        data = (u8 *) (eap + 1);

        if (len < sizeof(*eap) + 1) {
                printf("handle_eap_response: too short response data\n");
                return;
        }

        sm->eap_type_supp = type = data[0];

        hostapd_logger(hapd, sm->addr, HOSTAPD_MODULE_IEEE8021X,
                       HOSTAPD_LEVEL_DEBUG, "received EAP packet (code=%d "
                       "id=%d len=%d) from STA: EAP Response-%s (%d)",
                       eap->code, eap->identifier, be_to_host16(eap->length),
                       eap_type_text(type), type);

        sm->dot1xAuthEapolRespFramesRx++;

        wpabuf_free(sm->eap_if->eapRespData);
        sm->eap_if->eapRespData = wpabuf_alloc_copy(eap, len);
        sm->eapolEap = TRUE;
}


/* Process incoming EAP packet from Supplicant */
static void handle_eap(struct hostapd_data *hapd, struct sta_info *sta,
                       u8 *buf, size_t len)
{
        struct eap_hdr *eap;
        u16 eap_len;

        if (len < sizeof(*eap)) {
                printf("   too short EAP packet\n");
                return;
        }

        eap = (struct eap_hdr *) buf;

        eap_len = be_to_host16(eap->length);
        wpa_printf(MSG_DEBUG, "EAP: code=%d identifier=%d length=%d",
                   eap->code, eap->identifier, eap_len);
        if (eap_len < sizeof(*eap)) {
                wpa_printf(MSG_DEBUG, "   Invalid EAP length");
                return;
        } else if (eap_len > len) {
                wpa_printf(MSG_DEBUG, "   Too short frame to contain this EAP "
                           "packet");
                return;
        } else if (eap_len < len) {
                wpa_printf(MSG_DEBUG, "   Ignoring %lu extra bytes after EAP "
                           "packet", (unsigned long) len - eap_len);
        }

        switch (eap->code) {
        case EAP_CODE_REQUEST:
                wpa_printf(MSG_DEBUG, " (request)");
                return;
        case EAP_CODE_RESPONSE:
                wpa_printf(MSG_DEBUG, " (response)");
                handle_eap_response(hapd, sta, eap, eap_len);
                break;
        case EAP_CODE_SUCCESS:
                wpa_printf(MSG_DEBUG, " (success)");
                return;
        case EAP_CODE_FAILURE:
                wpa_printf(MSG_DEBUG, " (failure)");
                return;
        default:
                wpa_printf(MSG_DEBUG, " (unknown code)");
                return;
        }
}


void ieee802_1x_receive(struct hostapd_data *hapd, const u8 *sa, const u8 *buf,
                        size_t len)
{
        struct sta_info *sta;
        struct ieee802_1x_hdr *hdr;
        struct ieee802_1x_eapol_key *key;
        u16 datalen;
        struct rsn_pmksa_cache_entry *pmksa;

        if (!hapd->conf->ieee802_1x && !hapd->conf->wpa &&
            !hapd->conf->wps_state)
                return;

        wpa_printf(MSG_DEBUG, "IEEE 802.1X: %lu bytes from " MACSTR,
                   (unsigned long) len, MAC2STR(sa));
        sta = ap_get_sta(hapd, sa);
        if (!sta || !(sta->flags & WLAN_STA_ASSOC)) {
                wpa_printf(MSG_DEBUG, "IEEE 802.1X data frame from not "
                           "associated STA");
                return;
        }

        if (len < sizeof(*hdr)) {
                printf("   too short IEEE 802.1X packet\n");
                return;
        }

        hdr = (struct ieee802_1x_hdr *) buf;
        datalen = be_to_host16(hdr->length);
        wpa_printf(MSG_DEBUG, "   IEEE 802.1X: version=%d type=%d length=%d",
                   hdr->version, hdr->type, datalen);

        if (len - sizeof(*hdr) < datalen) {
                printf("   frame too short for this IEEE 802.1X packet\n");
                if (sta->eapol_sm)
                        sta->eapol_sm->dot1xAuthEapLengthErrorFramesRx++;
                return;
        }
        if (len - sizeof(*hdr) > datalen) {
                wpa_printf(MSG_DEBUG, "   ignoring %lu extra octets after "
                           "IEEE 802.1X packet",
                           (unsigned long) len - sizeof(*hdr) - datalen);
        }

        if (sta->eapol_sm) {
                sta->eapol_sm->dot1xAuthLastEapolFrameVersion = hdr->version;
                sta->eapol_sm->dot1xAuthEapolFramesRx++;
        }

        key = (struct ieee802_1x_eapol_key *) (hdr + 1);
        if (datalen >= sizeof(struct ieee802_1x_eapol_key) &&
            hdr->type == IEEE802_1X_TYPE_EAPOL_KEY &&
            (key->type == EAPOL_KEY_TYPE_WPA ||
             key->type == EAPOL_KEY_TYPE_RSN)) {
                wpa_receive(hapd->wpa_auth, sta->wpa_sm, (u8 *) hdr,
                            sizeof(*hdr) + datalen);
                return;
        }

        if ((!hapd->conf->ieee802_1x &&
             !(sta->flags & (WLAN_STA_WPS | WLAN_STA_MAYBE_WPS))) ||
            wpa_key_mgmt_wpa_psk(wpa_auth_sta_key_mgmt(sta->wpa_sm)))
                return;

        if (!sta->eapol_sm) {
                sta->eapol_sm = eapol_auth_alloc(hapd->eapol_auth, sta->addr,
                                                 sta->flags & WLAN_STA_PREAUTH,
                                                 sta);
                if (!sta->eapol_sm)
                        return;

#ifdef CONFIG_WPS
                if (!hapd->conf->ieee802_1x &&
                    ((sta->flags & (WLAN_STA_WPS | WLAN_STA_MAYBE_WPS)) ==
                     WLAN_STA_MAYBE_WPS)) {
                        /*
                         * Delay EAPOL frame transmission until a possible WPS
                         * STA initiates the handshake with EAPOL-Start.
                         */
                        sta->eapol_sm->flags |= EAPOL_SM_WAIT_START;
                }
#endif /* CONFIG_WPS */

                sta->eapol_sm->eap_if->portEnabled = TRUE;
        }

        /* since we support version 1, we can ignore version field and proceed
         * as specified in version 1 standard [IEEE Std 802.1X-2001, 7.5.5] */
        /* TODO: actually, we are not version 1 anymore.. However, Version 2
         * does not change frame contents, so should be ok to process frames
         * more or less identically. Some changes might be needed for
         * verification of fields. */

        switch (hdr->type) {
        case IEEE802_1X_TYPE_EAP_PACKET:
                handle_eap(hapd, sta, (u8 *) (hdr + 1), datalen);
                break;

        case IEEE802_1X_TYPE_EAPOL_START:
                hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE8021X,
                               HOSTAPD_LEVEL_DEBUG, "received EAPOL-Start "
                               "from STA");
                sta->eapol_sm->flags &= ~EAPOL_SM_WAIT_START;
                pmksa = wpa_auth_sta_get_pmksa(sta->wpa_sm);
                if (pmksa) {
                        hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_WPA,
                                       HOSTAPD_LEVEL_DEBUG, "cached PMKSA "
                                       "available - ignore it since "
                                       "STA sent EAPOL-Start");
                        wpa_auth_sta_clear_pmksa(sta->wpa_sm, pmksa);
                }
                sta->eapol_sm->eapolStart = TRUE;
                sta->eapol_sm->dot1xAuthEapolStartFramesRx++;
                wpa_auth_sm_event(sta->wpa_sm, WPA_REAUTH_EAPOL);
                break;

        case IEEE802_1X_TYPE_EAPOL_LOGOFF:
                hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE8021X,
                               HOSTAPD_LEVEL_DEBUG, "received EAPOL-Logoff "
                               "from STA");
                sta->acct_terminate_cause =
                        RADIUS_ACCT_TERMINATE_CAUSE_USER_REQUEST;
                accounting_sta_stop(hapd, sta);
                sta->eapol_sm->eapolLogoff = TRUE;
                sta->eapol_sm->dot1xAuthEapolLogoffFramesRx++;
                break;

        case IEEE802_1X_TYPE_EAPOL_KEY:
                wpa_printf(MSG_DEBUG, "   EAPOL-Key");
                if (!(sta->flags & WLAN_STA_AUTHORIZED)) {
                        wpa_printf(MSG_DEBUG, "   Dropped key data from "
                                   "unauthorized Supplicant");
                        break;
                }
                break;

        case IEEE802_1X_TYPE_EAPOL_ENCAPSULATED_ASF_ALERT:
                wpa_printf(MSG_DEBUG, "   EAPOL-Encapsulated-ASF-Alert");
                /* TODO: implement support for this; show data */
                break;

        default:
                wpa_printf(MSG_DEBUG, "   unknown IEEE 802.1X packet type");
                sta->eapol_sm->dot1xAuthInvalidEapolFramesRx++;
                break;
        }

        eapol_auth_step(sta->eapol_sm);
}


void ieee802_1x_new_station(struct hostapd_data *hapd, struct sta_info *sta)
{
        struct rsn_pmksa_cache_entry *pmksa;
        int reassoc = 1;
        int force_1x = 0;

#ifdef CONFIG_WPS
        if (hapd->conf->wps_state && hapd->conf->wpa &&
            (sta->flags & (WLAN_STA_WPS | WLAN_STA_MAYBE_WPS))) {
                /*
                 * Need to enable IEEE 802.1X/EAPOL state machines for possible
                 * WPS handshake even if IEEE 802.1X/EAPOL is not used for
                 * authentication in this BSS.
                 */
                force_1x = 1;
        }
#endif /* CONFIG_WPS */

        if ((!force_1x && !hapd->conf->ieee802_1x) ||
            wpa_key_mgmt_wpa_psk(wpa_auth_sta_key_mgmt(sta->wpa_sm)))
                return;

        if (sta->eapol_sm == NULL) {
                hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE8021X,
                               HOSTAPD_LEVEL_DEBUG, "start authentication");
                sta->eapol_sm = eapol_auth_alloc(hapd->eapol_auth, sta->addr,
                                                 sta->flags & WLAN_STA_PREAUTH,
                                                 sta);
                if (sta->eapol_sm == NULL) {
                        hostapd_logger(hapd, sta->addr,
                                       HOSTAPD_MODULE_IEEE8021X,
                                       HOSTAPD_LEVEL_INFO,
                                       "failed to allocate state machine");
                        return;
                }
                reassoc = 0;
        }

#ifdef CONFIG_WPS
        sta->eapol_sm->flags &= ~EAPOL_SM_WAIT_START;
        if (!hapd->conf->ieee802_1x && !(sta->flags & WLAN_STA_WPS)) {
                /*
                 * Delay EAPOL frame transmission until a possible WPS
                 * initiates the handshake with EAPOL-Start.
                 */
                sta->eapol_sm->flags |= EAPOL_SM_WAIT_START;
        }
#endif /* CONFIG_WPS */

        sta->eapol_sm->eap_if->portEnabled = TRUE;

        pmksa = wpa_auth_sta_get_pmksa(sta->wpa_sm);
        if (pmksa) {
                int old_vlanid;

                hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE8021X,
                               HOSTAPD_LEVEL_DEBUG,
                               "PMK from PMKSA cache - skip IEEE 802.1X/EAP");
                /* Setup EAPOL state machines to already authenticated state
                 * because of existing PMKSA information in the cache. */
                sta->eapol_sm->keyRun = TRUE;
                sta->eapol_sm->eap_if->eapKeyAvailable = TRUE;
                sta->eapol_sm->auth_pae_state = AUTH_PAE_AUTHENTICATING;
                sta->eapol_sm->be_auth_state = BE_AUTH_SUCCESS;
                sta->eapol_sm->authSuccess = TRUE;
                if (sta->eapol_sm->eap)
                        eap_sm_notify_cached(sta->eapol_sm->eap);
                old_vlanid = sta->vlan_id;
                pmksa_cache_to_eapol_data(pmksa, sta->eapol_sm);
                if (sta->ssid->dynamic_vlan == DYNAMIC_VLAN_DISABLED)
                        sta->vlan_id = 0;
                ap_sta_bind_vlan(hapd, sta, old_vlanid);
        } else {
                if (reassoc) {
                        /*
                         * Force EAPOL state machines to start
                         * re-authentication without having to wait for the
                         * Supplicant to send EAPOL-Start.
                         */
                        sta->eapol_sm->reAuthenticate = TRUE;
                }
                eapol_auth_step(sta->eapol_sm);
        }
}


void ieee802_1x_free_station(struct sta_info *sta)
{
        struct eapol_state_machine *sm = sta->eapol_sm;

        if (sm == NULL)
                return;

        sta->eapol_sm = NULL;

#ifndef CONFIG_NO_RADIUS
        if (sm->last_recv_radius) {
                radius_msg_free(sm->last_recv_radius);
                os_free(sm->last_recv_radius);
        }
        radius_free_class(&sm->radius_class);
#endif /* CONFIG_NO_RADIUS */

        os_free(sm->identity);
        eapol_auth_free(sm);
}


#ifndef CONFIG_NO_RADIUS
static void ieee802_1x_decapsulate_radius(struct hostapd_data *hapd,
                                          struct sta_info *sta)
{
        u8 *eap;
        size_t len;
        struct eap_hdr *hdr;
        int eap_type = -1;
        char buf[64];
        struct radius_msg *msg;
        struct eapol_state_machine *sm = sta->eapol_sm;

        if (sm == NULL || sm->last_recv_radius == NULL) {
                if (sm)
                        sm->eap_if->aaaEapNoReq = TRUE;
                return;
        }

        msg = sm->last_recv_radius;

        eap = radius_msg_get_eap(msg, &len);
        if (eap == NULL) {
                /* RFC 3579, Chap. 2.6.3:
                 * RADIUS server SHOULD NOT send Access-Reject/no EAP-Message
                 * attribute */
                hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE8021X,
                               HOSTAPD_LEVEL_WARNING, "could not extract "
                               "EAP-Message from RADIUS message");
                sm->eap_if->aaaEapNoReq = TRUE;
                return;
        }

        if (len < sizeof(*hdr)) {
                hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE8021X,
                               HOSTAPD_LEVEL_WARNING, "too short EAP packet "
                               "received from authentication server");
                os_free(eap);
                sm->eap_if->aaaEapNoReq = TRUE;
                return;
        }

        if (len > sizeof(*hdr))
                eap_type = eap[sizeof(*hdr)];

        hdr = (struct eap_hdr *) eap;
        switch (hdr->code) {
        case EAP_CODE_REQUEST:
                if (eap_type >= 0)
                        sm->eap_type_authsrv = eap_type;
                os_snprintf(buf, sizeof(buf), "EAP-Request-%s (%d)",
                            eap_type >= 0 ? eap_type_text(eap_type) : "??",
                            eap_type);
                break;
        case EAP_CODE_RESPONSE:
                os_snprintf(buf, sizeof(buf), "EAP Response-%s (%d)",
                            eap_type >= 0 ? eap_type_text(eap_type) : "??",
                            eap_type);
                break;
        case EAP_CODE_SUCCESS:
                os_strlcpy(buf, "EAP Success", sizeof(buf));
                break;
        case EAP_CODE_FAILURE:
                os_strlcpy(buf, "EAP Failure", sizeof(buf));
                break;
        default:
                os_strlcpy(buf, "unknown EAP code", sizeof(buf));
                break;
        }
        buf[sizeof(buf) - 1] = '\0';
        hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE8021X,
                       HOSTAPD_LEVEL_DEBUG, "decapsulated EAP packet (code=%d "
                       "id=%d len=%d) from RADIUS server: %s",
                       hdr->code, hdr->identifier, be_to_host16(hdr->length),
                       buf);
        sm->eap_if->aaaEapReq = TRUE;

        wpabuf_free(sm->eap_if->aaaEapReqData);
        sm->eap_if->aaaEapReqData = wpabuf_alloc_ext_data(eap, len);
}


static void ieee802_1x_get_keys(struct hostapd_data *hapd,
                                struct sta_info *sta, struct radius_msg *msg,
                                struct radius_msg *req,
                                const u8 *shared_secret,
                                size_t shared_secret_len)
{
        struct radius_ms_mppe_keys *keys;
        struct eapol_state_machine *sm = sta->eapol_sm;
        if (sm == NULL)
                return;

        keys = radius_msg_get_ms_keys(msg, req, shared_secret,
                                      shared_secret_len);

        if (keys && keys->send && keys->recv) {
                size_t len = keys->send_len + keys->recv_len;
                wpa_hexdump_key(MSG_DEBUG, "MS-MPPE-Send-Key",
                                keys->send, keys->send_len);
                wpa_hexdump_key(MSG_DEBUG, "MS-MPPE-Recv-Key",
                                keys->recv, keys->recv_len);

                os_free(sm->eap_if->aaaEapKeyData);
                sm->eap_if->aaaEapKeyData = os_malloc(len);
                if (sm->eap_if->aaaEapKeyData) {
                        os_memcpy(sm->eap_if->aaaEapKeyData, keys->recv,
                                  keys->recv_len);
                        os_memcpy(sm->eap_if->aaaEapKeyData + keys->recv_len,
                                  keys->send, keys->send_len);
                        sm->eap_if->aaaEapKeyDataLen = len;
                        sm->eap_if->aaaEapKeyAvailable = TRUE;
                }
        }

        if (keys) {
                os_free(keys->send);
                os_free(keys->recv);
                os_free(keys);
        }
}


static void ieee802_1x_store_radius_class(struct hostapd_data *hapd,
                                          struct sta_info *sta,
                                          struct radius_msg *msg)
{
        u8 *class;
        size_t class_len;
        struct eapol_state_machine *sm = sta->eapol_sm;
        int count, i;
        struct radius_attr_data *nclass;
        size_t nclass_count;

        if (!hapd->conf->radius->acct_server || hapd->radius == NULL ||
            sm == NULL)
                return;

        radius_free_class(&sm->radius_class);
        count = radius_msg_count_attr(msg, RADIUS_ATTR_CLASS, 1);
        if (count <= 0)
                return;

        nclass = os_zalloc(count * sizeof(struct radius_attr_data));
        if (nclass == NULL)
                return;

        nclass_count = 0;

        class = NULL;
        for (i = 0; i < count; i++) {
                do {
                        if (radius_msg_get_attr_ptr(msg, RADIUS_ATTR_CLASS,
                                                    &class, &class_len,
                                                    class) < 0) {
                                i = count;
                                break;
                        }
                } while (class_len < 1);

                nclass[nclass_count].data = os_malloc(class_len);
                if (nclass[nclass_count].data == NULL)
                        break;

                os_memcpy(nclass[nclass_count].data, class, class_len);
                nclass[nclass_count].len = class_len;
                nclass_count++;
        }

        sm->radius_class.attr = nclass;
        sm->radius_class.count = nclass_count;
        wpa_printf(MSG_DEBUG, "IEEE 802.1X: Stored %lu RADIUS Class "
                   "attributes for " MACSTR,
                   (unsigned long) sm->radius_class.count,
                   MAC2STR(sta->addr));
}


/* Update sta->identity based on User-Name attribute in Access-Accept */
static void ieee802_1x_update_sta_identity(struct hostapd_data *hapd,
                                           struct sta_info *sta,
                                           struct radius_msg *msg)
{
        u8 *buf, *identity;
        size_t len;
        struct eapol_state_machine *sm = sta->eapol_sm;

        if (sm == NULL)
                return;

        if (radius_msg_get_attr_ptr(msg, RADIUS_ATTR_USER_NAME, &buf, &len,
                                    NULL) < 0)
                return;

        identity = os_malloc(len + 1);
        if (identity == NULL)
                return;

        os_memcpy(identity, buf, len);
        identity[len] = '\0';

        hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE8021X,
                       HOSTAPD_LEVEL_DEBUG, "old identity '%s' updated with "
                       "User-Name from Access-Accept '%s'",
                       sm->identity ? (char *) sm->identity : "N/A",
                       (char *) identity);

        os_free(sm->identity);
        sm->identity = identity;
        sm->identity_len = len;
}


struct sta_id_search {
        u8 identifier;
        struct eapol_state_machine *sm;
};


static int ieee802_1x_select_radius_identifier(struct hostapd_data *hapd,
                                               struct sta_info *sta,
                                               void *ctx)
{
        struct sta_id_search *id_search = ctx;
        struct eapol_state_machine *sm = sta->eapol_sm;

        if (sm && sm->radius_identifier >= 0 &&
            sm->radius_identifier == id_search->identifier) {
                id_search->sm = sm;
                return 1;
        }
        return 0;
}


static struct eapol_state_machine *
ieee802_1x_search_radius_identifier(struct hostapd_data *hapd, u8 identifier)
{
        struct sta_id_search id_search;
        id_search.identifier = identifier;
        id_search.sm = NULL;
        ap_for_each_sta(hapd, ieee802_1x_select_radius_identifier, &id_search);
        return id_search.sm;
}


static RadiusRxResult
ieee802_1x_receive_auth(struct radius_msg *msg, struct radius_msg *req,
                        const u8 *shared_secret, size_t shared_secret_len,
                        void *data)
{
        struct hostapd_data *hapd = data;
        struct sta_info *sta;
        u32 session_timeout = 0, termination_action, acct_interim_interval;
        int session_timeout_set, old_vlanid = 0;
        struct eapol_state_machine *sm;
        int override_eapReq = 0;

        sm = ieee802_1x_search_radius_identifier(hapd, msg->hdr->identifier);
        if (sm == NULL) {
                wpa_printf(MSG_DEBUG, "IEEE 802.1X: Could not find matching "
                           "station for this RADIUS message");
                return RADIUS_RX_UNKNOWN;
        }
        sta = sm->sta;

        /* RFC 2869, Ch. 5.13: valid Message-Authenticator attribute MUST be
         * present when packet contains an EAP-Message attribute */
        if (msg->hdr->code == RADIUS_CODE_ACCESS_REJECT &&
            radius_msg_get_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR, NULL,
                                0) < 0 &&
            radius_msg_get_attr(msg, RADIUS_ATTR_EAP_MESSAGE, NULL, 0) < 0) {
                wpa_printf(MSG_DEBUG, "Allowing RADIUS Access-Reject without "
                           "Message-Authenticator since it does not include "
                           "EAP-Message");
        } else if (radius_msg_verify(msg, shared_secret, shared_secret_len,
                                     req, 1)) {
                printf("Incoming RADIUS packet did not have correct "
                       "Message-Authenticator - dropped\n");
                return RADIUS_RX_INVALID_AUTHENTICATOR;
        }

        if (msg->hdr->code != RADIUS_CODE_ACCESS_ACCEPT &&
            msg->hdr->code != RADIUS_CODE_ACCESS_REJECT &&
            msg->hdr->code != RADIUS_CODE_ACCESS_CHALLENGE) {
                printf("Unknown RADIUS message code\n");
                return RADIUS_RX_UNKNOWN;
        }

        sm->radius_identifier = -1;
        wpa_printf(MSG_DEBUG, "RADIUS packet matching with station " MACSTR,
                   MAC2STR(sta->addr));

        if (sm->last_recv_radius) {
                radius_msg_free(sm->last_recv_radius);
                os_free(sm->last_recv_radius);
        }

        sm->last_recv_radius = msg;

        session_timeout_set =
                !radius_msg_get_attr_int32(msg, RADIUS_ATTR_SESSION_TIMEOUT,
                                           &session_timeout);
        if (radius_msg_get_attr_int32(msg, RADIUS_ATTR_TERMINATION_ACTION,
                                      &termination_action))
                termination_action = RADIUS_TERMINATION_ACTION_DEFAULT;

        if (hapd->conf->radius->acct_interim_interval == 0 &&
            msg->hdr->code == RADIUS_CODE_ACCESS_ACCEPT &&
            radius_msg_get_attr_int32(msg, RADIUS_ATTR_ACCT_INTERIM_INTERVAL,
                                      &acct_interim_interval) == 0) {
                if (acct_interim_interval < 60) {
                        hostapd_logger(hapd, sta->addr,
                                       HOSTAPD_MODULE_IEEE8021X,
                                       HOSTAPD_LEVEL_INFO,
                                       "ignored too small "
                                       "Acct-Interim-Interval %d",
                                       acct_interim_interval);
                } else
                        sta->acct_interim_interval = acct_interim_interval;
        }


        switch (msg->hdr->code) {
        case RADIUS_CODE_ACCESS_ACCEPT:
                if (sta->ssid->dynamic_vlan == DYNAMIC_VLAN_DISABLED)
                        sta->vlan_id = 0;
#ifndef CONFIG_NO_VLAN
                else {
                        old_vlanid = sta->vlan_id;
                        sta->vlan_id = radius_msg_get_vlanid(msg);
                }
                if (sta->vlan_id > 0 &&
                    hostapd_get_vlan_id_ifname(hapd->conf->vlan,
                                               sta->vlan_id)) {
                        hostapd_logger(hapd, sta->addr,
                                       HOSTAPD_MODULE_RADIUS,
                                       HOSTAPD_LEVEL_INFO,
                                       "VLAN ID %d", sta->vlan_id);
                } else if (sta->ssid->dynamic_vlan == DYNAMIC_VLAN_REQUIRED) {
                        sta->eapol_sm->authFail = TRUE;
                        hostapd_logger(hapd, sta->addr,
                                       HOSTAPD_MODULE_IEEE8021X,
                                       HOSTAPD_LEVEL_INFO, "authentication "
                                       "server did not include required VLAN "
                                       "ID in Access-Accept");
                        break;
                }
#endif /* CONFIG_NO_VLAN */

                ap_sta_bind_vlan(hapd, sta, old_vlanid);

                /* RFC 3580, Ch. 3.17 */
                if (session_timeout_set && termination_action ==
                    RADIUS_TERMINATION_ACTION_RADIUS_REQUEST) {
                        sm->reAuthPeriod = session_timeout;
                } else if (session_timeout_set)
                        ap_sta_session_timeout(hapd, sta, session_timeout);

                sm->eap_if->aaaSuccess = TRUE;
                override_eapReq = 1;
                ieee802_1x_get_keys(hapd, sta, msg, req, shared_secret,
                                    shared_secret_len);
                ieee802_1x_store_radius_class(hapd, sta, msg);
                ieee802_1x_update_sta_identity(hapd, sta, msg);
                if (sm->eap_if->eapKeyAvailable &&
                    wpa_auth_pmksa_add(sta->wpa_sm, sm->eapol_key_crypt,
                                       session_timeout_set ?
                                       (int) session_timeout : -1, sm) == 0) {
                        hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_WPA,
                                       HOSTAPD_LEVEL_DEBUG,
                                       "Added PMKSA cache entry");
                }
                break;
        case RADIUS_CODE_ACCESS_REJECT:
                sm->eap_if->aaaFail = TRUE;
                override_eapReq = 1;
                break;
        case RADIUS_CODE_ACCESS_CHALLENGE:
                sm->eap_if->aaaEapReq = TRUE;
                if (session_timeout_set) {
                        /* RFC 2869, Ch. 2.3.2; RFC 3580, Ch. 3.17 */
                        sm->eap_if->aaaMethodTimeout = session_timeout;
                        hostapd_logger(hapd, sm->addr,
                                       HOSTAPD_MODULE_IEEE8021X,
                                       HOSTAPD_LEVEL_DEBUG,
                                       "using EAP timeout of %d seconds (from "
                                       "RADIUS)",
                                       sm->eap_if->aaaMethodTimeout);
                } else {
                        /*
                         * Use dynamic retransmission behavior per EAP
                         * specification.
                         */
                        sm->eap_if->aaaMethodTimeout = 0;
                }
                break;
        }

        ieee802_1x_decapsulate_radius(hapd, sta);
        if (override_eapReq)
                sm->eap_if->aaaEapReq = FALSE;

        eapol_auth_step(sm);

        return RADIUS_RX_QUEUED;
}
#endif /* CONFIG_NO_RADIUS */


void ieee802_1x_abort_auth(struct hostapd_data *hapd, struct sta_info *sta)
{
        struct eapol_state_machine *sm = sta->eapol_sm;
        if (sm == NULL)
                return;

        hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE8021X,
                       HOSTAPD_LEVEL_DEBUG, "aborting authentication");

#ifndef CONFIG_NO_RADIUS
        if (sm->last_recv_radius) {
                radius_msg_free(sm->last_recv_radius);
                os_free(sm->last_recv_radius);
                sm->last_recv_radius = NULL;
        }
#endif /* CONFIG_NO_RADIUS */

        if (sm->eap_if->eapTimeout) {
                /*
                 * Disconnect the STA since it did not reply to the last EAP
                 * request and we cannot continue EAP processing (EAP-Failure
                 * could only be sent if the EAP peer actually replied).
                 */
                sm->eap_if->portEnabled = FALSE;
                hostapd_sta_deauth(hapd, sta->addr,
                                   WLAN_REASON_PREV_AUTH_NOT_VALID);
                sta->flags &= ~(WLAN_STA_AUTH | WLAN_STA_ASSOC |
                                WLAN_STA_AUTHORIZED);
                eloop_cancel_timeout(ap_handle_timer, hapd, sta);
                eloop_register_timeout(0, 0, ap_handle_timer, hapd, sta);
                sta->timeout_next = STA_REMOVE;
        }
}


#ifdef HOSTAPD_DUMP_STATE
static void fprint_char(FILE *f, char c)
{
        if (c >= 32 && c < 127)
                fprintf(f, "%c", c);
        else
                fprintf(f, "<%02x>", c);
}


void ieee802_1x_dump_state(FILE *f, const char *prefix, struct sta_info *sta)
{
        struct eapol_state_machine *sm = sta->eapol_sm;
        if (sm == NULL)
                return;

        fprintf(f, "%sIEEE 802.1X:\n", prefix);

        if (sm->identity) {
                size_t i;
                fprintf(f, "%sidentity=", prefix);
                for (i = 0; i < sm->identity_len; i++)
                        fprint_char(f, sm->identity[i]);
                fprintf(f, "\n");
        }

        fprintf(f, "%slast EAP type: Authentication Server: %d (%s) "
                "Supplicant: %d (%s)\n", prefix,
                sm->eap_type_authsrv, eap_type_text(sm->eap_type_authsrv),
                sm->eap_type_supp, eap_type_text(sm->eap_type_supp));

        fprintf(f, "%scached_packets=%s\n", prefix,
                sm->last_recv_radius ? "[RX RADIUS]" : "");

        eapol_auth_dump_state(f, prefix, sm);
}
#endif /* HOSTAPD_DUMP_STATE */


static int ieee802_1x_rekey_broadcast(struct hostapd_data *hapd)
{
        struct eapol_authenticator *eapol = hapd->eapol_auth;

        if (hapd->conf->default_wep_key_len < 1)
                return 0;

        os_free(eapol->default_wep_key);
        eapol->default_wep_key = os_malloc(hapd->conf->default_wep_key_len);
        if (eapol->default_wep_key == NULL ||
            os_get_random(eapol->default_wep_key,
                          hapd->conf->default_wep_key_len)) {
                printf("Could not generate random WEP key.\n");
                os_free(eapol->default_wep_key);
                eapol->default_wep_key = NULL;
                return -1;
        }

        wpa_hexdump_key(MSG_DEBUG, "IEEE 802.1X: New default WEP key",
                        eapol->default_wep_key,
                        hapd->conf->default_wep_key_len);

        return 0;
}


static int ieee802_1x_sta_key_available(struct hostapd_data *hapd,
                                        struct sta_info *sta, void *ctx)
{
        if (sta->eapol_sm) {
                sta->eapol_sm->eap_if->eapKeyAvailable = TRUE;
                eapol_auth_step(sta->eapol_sm);
        }
        return 0;
}


static void ieee802_1x_rekey(void *eloop_ctx, void *timeout_ctx)
{
        struct hostapd_data *hapd = eloop_ctx;
        struct eapol_authenticator *eapol = hapd->eapol_auth;

        if (eapol->default_wep_key_idx >= 3)
                eapol->default_wep_key_idx =
                        hapd->conf->individual_wep_key_len > 0 ? 1 : 0;
        else
                eapol->default_wep_key_idx++;

        wpa_printf(MSG_DEBUG, "IEEE 802.1X: New default WEP key index %d",
                   eapol->default_wep_key_idx);
                      
        if (ieee802_1x_rekey_broadcast(hapd)) {
                hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE8021X,
                               HOSTAPD_LEVEL_WARNING, "failed to generate a "
                               "new broadcast key");
                os_free(eapol->default_wep_key);
                eapol->default_wep_key = NULL;
                return;
        }

        /* TODO: Could setup key for RX here, but change default TX keyid only
         * after new broadcast key has been sent to all stations. */
        if (hostapd_set_key(hapd->conf->iface, hapd, WPA_ALG_WEP, NULL,
                            eapol->default_wep_key_idx, 1, NULL, 0,
                            eapol->default_wep_key,
                            hapd->conf->default_wep_key_len)) {
                hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE8021X,
                               HOSTAPD_LEVEL_WARNING, "failed to configure a "
                               "new broadcast key");
                os_free(eapol->default_wep_key);
                eapol->default_wep_key = NULL;
                return;
        }

        ap_for_each_sta(hapd, ieee802_1x_sta_key_available, NULL);

        if (hapd->conf->wep_rekeying_period > 0) {
                eloop_register_timeout(hapd->conf->wep_rekeying_period, 0,
                                       ieee802_1x_rekey, hapd, NULL);
        }
}


static void ieee802_1x_eapol_send(void *ctx, void *sta_ctx, u8 type,
                                  const u8 *data, size_t datalen)
{
        ieee802_1x_send(ctx, sta_ctx, type, data, datalen);
}


static void ieee802_1x_aaa_send(void *ctx, void *sta_ctx,
                                const u8 *data, size_t datalen)
{
#ifndef CONFIG_NO_RADIUS
        struct hostapd_data *hapd = ctx;
        struct sta_info *sta = sta_ctx;

        ieee802_1x_encapsulate_radius(hapd, sta, data, datalen);
#endif /* CONFIG_NO_RADIUS */
}


static void _ieee802_1x_finished(void *ctx, void *sta_ctx, int success,
                                 int preauth)
{
        struct hostapd_data *hapd = ctx;
        struct sta_info *sta = sta_ctx;
        if (preauth)
                rsn_preauth_finished(hapd, sta, success);
        else
                ieee802_1x_finished(hapd, sta, success);
}


static int ieee802_1x_get_eap_user(void *ctx, const u8 *identity,
                                   size_t identity_len, int phase2,
                                   struct eap_user *user)
{
        struct hostapd_data *hapd = ctx;
        const struct hostapd_eap_user *eap_user;
        int i, count;

        eap_user = hostapd_get_eap_user(hapd->conf, identity,
                                        identity_len, phase2);
        if (eap_user == NULL)
                return -1;

        os_memset(user, 0, sizeof(*user));
        user->phase2 = phase2;
        count = EAP_USER_MAX_METHODS;
        if (count > EAP_MAX_METHODS)
                count = EAP_MAX_METHODS;
        for (i = 0; i < count; i++) {
                user->methods[i].vendor = eap_user->methods[i].vendor;
                user->methods[i].method = eap_user->methods[i].method;
        }

        if (eap_user->password) {
                user->password = os_malloc(eap_user->password_len);
                if (user->password == NULL)
                        return -1;
                os_memcpy(user->password, eap_user->password,
                          eap_user->password_len);
                user->password_len = eap_user->password_len;
        }
        user->force_version = eap_user->force_version;
        user->ttls_auth = eap_user->ttls_auth;

        return 0;
}


static int ieee802_1x_sta_entry_alive(void *ctx, const u8 *addr)
{
        struct hostapd_data *hapd = ctx;
        struct sta_info *sta;
        sta = ap_get_sta(hapd, addr);
        if (sta == NULL || sta->eapol_sm == NULL)
                return 0;
        return 1;
}


static void ieee802_1x_logger(void *ctx, const u8 *addr,
                              eapol_logger_level level, const char *txt)
{
#ifndef CONFIG_NO_HOSTAPD_LOGGER
        struct hostapd_data *hapd = ctx;
        int hlevel;

        switch (level) {
        case EAPOL_LOGGER_WARNING:
                hlevel = HOSTAPD_LEVEL_WARNING;
                break;
        case EAPOL_LOGGER_INFO:
                hlevel = HOSTAPD_LEVEL_INFO;
                break;
        case EAPOL_LOGGER_DEBUG:
        default:
                hlevel = HOSTAPD_LEVEL_DEBUG;
                break;
        }

        hostapd_logger(hapd, addr, HOSTAPD_MODULE_IEEE8021X, hlevel, "%s",
                       txt);
#endif /* CONFIG_NO_HOSTAPD_LOGGER */
}


static void ieee802_1x_set_port_authorized(void *ctx, void *sta_ctx,
                                           int authorized)
{
        struct hostapd_data *hapd = ctx;
        struct sta_info *sta = sta_ctx;
        ieee802_1x_set_sta_authorized(hapd, sta, authorized);
}


static void _ieee802_1x_abort_auth(void *ctx, void *sta_ctx)
{
        struct hostapd_data *hapd = ctx;
        struct sta_info *sta = sta_ctx;
        ieee802_1x_abort_auth(hapd, sta);
}


static void _ieee802_1x_tx_key(void *ctx, void *sta_ctx)
{
        struct hostapd_data *hapd = ctx;
        struct sta_info *sta = sta_ctx;
        ieee802_1x_tx_key(hapd, sta);
}


int ieee802_1x_init(struct hostapd_data *hapd)
{
        int i;
        struct eapol_auth_config conf;
        struct eapol_auth_cb cb;

        os_memset(&conf, 0, sizeof(conf));
        conf.hapd = hapd;
        conf.eap_reauth_period = hapd->conf->eap_reauth_period;
        conf.wpa = hapd->conf->wpa;
        conf.individual_wep_key_len = hapd->conf->individual_wep_key_len;
        conf.eap_server = hapd->conf->eap_server;
        conf.ssl_ctx = hapd->ssl_ctx;
        conf.eap_sim_db_priv = hapd->eap_sim_db_priv;
        conf.eap_req_id_text = hapd->conf->eap_req_id_text;
        conf.eap_req_id_text_len = hapd->conf->eap_req_id_text_len;
        conf.pac_opaque_encr_key = hapd->conf->pac_opaque_encr_key;
        conf.eap_fast_a_id = hapd->conf->eap_fast_a_id;
        conf.eap_fast_a_id_len = hapd->conf->eap_fast_a_id_len;
        conf.eap_fast_a_id_info = hapd->conf->eap_fast_a_id_info;
        conf.eap_fast_prov = hapd->conf->eap_fast_prov;
        conf.pac_key_lifetime = hapd->conf->pac_key_lifetime;
        conf.pac_key_refresh_time = hapd->conf->pac_key_refresh_time;
        conf.eap_sim_aka_result_ind = hapd->conf->eap_sim_aka_result_ind;
        conf.tnc = hapd->conf->tnc;
        conf.wps = hapd->wps;

        os_memset(&cb, 0, sizeof(cb));
        cb.eapol_send = ieee802_1x_eapol_send;
        cb.aaa_send = ieee802_1x_aaa_send;
        cb.finished = _ieee802_1x_finished;
        cb.get_eap_user = ieee802_1x_get_eap_user;
        cb.sta_entry_alive = ieee802_1x_sta_entry_alive;
        cb.logger = ieee802_1x_logger;
        cb.set_port_authorized = ieee802_1x_set_port_authorized;
        cb.abort_auth = _ieee802_1x_abort_auth;
        cb.tx_key = _ieee802_1x_tx_key;

        hapd->eapol_auth = eapol_auth_init(&conf, &cb);
        if (hapd->eapol_auth == NULL)
                return -1;

        if ((hapd->conf->ieee802_1x || hapd->conf->wpa) &&
            hostapd_set_ieee8021x(hapd->conf->iface, hapd, 1))
                return -1;

#ifndef CONFIG_NO_RADIUS
        if (radius_client_register(hapd->radius, RADIUS_AUTH,
                                   ieee802_1x_receive_auth, hapd))
                return -1;
#endif /* CONFIG_NO_RADIUS */

        if (hapd->conf->default_wep_key_len) {
                hostapd_set_privacy(hapd, 1);

                for (i = 0; i < 4; i++)
                        hostapd_set_key(hapd->conf->iface, hapd, WPA_ALG_NONE,
                                        NULL, i, 0, NULL, 0, NULL, 0);

                ieee802_1x_rekey(hapd, NULL);

                if (hapd->eapol_auth->default_wep_key == NULL)
                        return -1;
        }

        return 0;
}


void ieee802_1x_deinit(struct hostapd_data *hapd)
{
        eloop_cancel_timeout(ieee802_1x_rekey, hapd, NULL);

        if (hapd->driver != NULL &&
            (hapd->conf->ieee802_1x || hapd->conf->wpa))
                hostapd_set_ieee8021x(hapd->conf->iface, hapd, 0);

        eapol_auth_deinit(hapd->eapol_auth);
        hapd->eapol_auth = NULL;
}


int ieee802_1x_reconfig(struct hostapd_data *hapd, 
                        struct hostapd_config *oldconf,
                        struct hostapd_bss_config *oldbss)
{
        ieee802_1x_deinit(hapd);
        return ieee802_1x_init(hapd);
}


int ieee802_1x_tx_status(struct hostapd_data *hapd, struct sta_info *sta,
                         const u8 *buf, size_t len, int ack)
{
        struct ieee80211_hdr *hdr;
        struct ieee802_1x_hdr *xhdr;
        struct ieee802_1x_eapol_key *key;
        u8 *pos;
        const unsigned char rfc1042_hdr[ETH_ALEN] =
                { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };

        if (sta == NULL)
                return -1;
        if (len < sizeof(*hdr) + sizeof(rfc1042_hdr) + 2 + sizeof(*xhdr))
                return 0;

        hdr = (struct ieee80211_hdr *) buf;
        pos = (u8 *) (hdr + 1);
        if (os_memcmp(pos, rfc1042_hdr, sizeof(rfc1042_hdr)) != 0)
                return 0;
        pos += sizeof(rfc1042_hdr);
        if (WPA_GET_BE16(pos) != ETH_P_PAE)
                return 0;
        pos += 2;

        xhdr = (struct ieee802_1x_hdr *) pos;
        pos += sizeof(*xhdr);

        wpa_printf(MSG_DEBUG, "IEEE 802.1X: " MACSTR " TX status - version=%d "
                   "type=%d length=%d - ack=%d",
                   MAC2STR(sta->addr), xhdr->version, xhdr->type,
                   be_to_host16(xhdr->length), ack);

        /* EAPOL EAP-Packet packets are eventually re-sent by either Supplicant
         * or Authenticator state machines, but EAPOL-Key packets are not
         * retransmitted in case of failure. Try to re-sent failed EAPOL-Key
         * packets couple of times because otherwise STA keys become
         * unsynchronized with AP. */
        if (xhdr->type == IEEE802_1X_TYPE_EAPOL_KEY && !ack &&
            pos + sizeof(*key) <= buf + len) {
                key = (struct ieee802_1x_eapol_key *) pos;
                hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE8021X,
                               HOSTAPD_LEVEL_DEBUG, "did not Ack EAPOL-Key "
                               "frame (%scast index=%d)",
                               key->key_index & BIT(7) ? "uni" : "broad",
                               key->key_index & ~BIT(7));
                /* TODO: re-send EAPOL-Key couple of times (with short delay
                 * between them?). If all attempt fail, report error and
                 * deauthenticate STA so that it will get new keys when
                 * authenticating again (e.g., after returning in range).
                 * Separate limit/transmit state needed both for unicast and
                 * broadcast keys(?) */
        }
        /* TODO: could move unicast key configuration from ieee802_1x_tx_key()
         * to here and change the key only if the EAPOL-Key packet was Acked.
         */

        return 1;
}


u8 * ieee802_1x_get_identity(struct eapol_state_machine *sm, size_t *len)
{
        if (sm == NULL || sm->identity == NULL)
                return NULL;

        *len = sm->identity_len;
        return sm->identity;
}


u8 * ieee802_1x_get_radius_class(struct eapol_state_machine *sm, size_t *len,
                                 int idx)
{
        if (sm == NULL || sm->radius_class.attr == NULL ||
            idx >= (int) sm->radius_class.count)
                return NULL;

        *len = sm->radius_class.attr[idx].len;
        return sm->radius_class.attr[idx].data;
}


const u8 * ieee802_1x_get_key(struct eapol_state_machine *sm, size_t *len)
{
        if (sm == NULL)
                return NULL;

        *len = sm->eap_if->eapKeyDataLen;
        return sm->eap_if->eapKeyData;
}


void ieee802_1x_notify_port_enabled(struct eapol_state_machine *sm,
                                    int enabled)
{
        if (sm == NULL)
                return;
        sm->eap_if->portEnabled = enabled ? TRUE : FALSE;
        eapol_auth_step(sm);
}


void ieee802_1x_notify_port_valid(struct eapol_state_machine *sm,
                                  int valid)
{
        if (sm == NULL)
                return;
        sm->portValid = valid ? TRUE : FALSE;
        eapol_auth_step(sm);
}


void ieee802_1x_notify_pre_auth(struct eapol_state_machine *sm, int pre_auth)
{
        if (sm == NULL)
                return;
        if (pre_auth)
                sm->flags |= EAPOL_SM_PREAUTH;
        else
                sm->flags &= ~EAPOL_SM_PREAUTH;
}


static const char * bool_txt(Boolean bool)
{
        return bool ? "TRUE" : "FALSE";
}


int ieee802_1x_get_mib(struct hostapd_data *hapd, char *buf, size_t buflen)
{
        /* TODO */
        return 0;
}


int ieee802_1x_get_mib_sta(struct hostapd_data *hapd, struct sta_info *sta,
                           char *buf, size_t buflen)
{
        int len = 0, ret;
        struct eapol_state_machine *sm = sta->eapol_sm;

        if (sm == NULL)
                return 0;

        ret = os_snprintf(buf + len, buflen - len,
                          "dot1xPaePortNumber=%d\n"
                          "dot1xPaePortProtocolVersion=%d\n"
                          "dot1xPaePortCapabilities=1\n"
                          "dot1xPaePortInitialize=%d\n"
                          "dot1xPaePortReauthenticate=FALSE\n",
                          sta->aid,
                          EAPOL_VERSION,
                          sm->initialize);
        if (ret < 0 || (size_t) ret >= buflen - len)
                return len;
        len += ret;

        /* dot1xAuthConfigTable */
        ret = os_snprintf(buf + len, buflen - len,
                          "dot1xAuthPaeState=%d\n"
                          "dot1xAuthBackendAuthState=%d\n"
                          "dot1xAuthAdminControlledDirections=%d\n"
                          "dot1xAuthOperControlledDirections=%d\n"
                          "dot1xAuthAuthControlledPortStatus=%d\n"
                          "dot1xAuthAuthControlledPortControl=%d\n"
                          "dot1xAuthQuietPeriod=%u\n"
                          "dot1xAuthServerTimeout=%u\n"
                          "dot1xAuthReAuthPeriod=%u\n"
                          "dot1xAuthReAuthEnabled=%s\n"
                          "dot1xAuthKeyTxEnabled=%s\n",
                          sm->auth_pae_state + 1,
                          sm->be_auth_state + 1,
                          sm->adminControlledDirections,
                          sm->operControlledDirections,
                          sm->authPortStatus,
                          sm->portControl,
                          sm->quietPeriod,
                          sm->serverTimeout,
                          sm->reAuthPeriod,
                          bool_txt(sm->reAuthEnabled),
                          bool_txt(sm->keyTxEnabled));
        if (ret < 0 || (size_t) ret >= buflen - len)
                return len;
        len += ret;

        /* dot1xAuthStatsTable */
        ret = os_snprintf(buf + len, buflen - len,
                          "dot1xAuthEapolFramesRx=%u\n"
                          "dot1xAuthEapolFramesTx=%u\n"
                          "dot1xAuthEapolStartFramesRx=%u\n"
                          "dot1xAuthEapolLogoffFramesRx=%u\n"
                          "dot1xAuthEapolRespIdFramesRx=%u\n"
                          "dot1xAuthEapolRespFramesRx=%u\n"
                          "dot1xAuthEapolReqIdFramesTx=%u\n"
                          "dot1xAuthEapolReqFramesTx=%u\n"
                          "dot1xAuthInvalidEapolFramesRx=%u\n"
                          "dot1xAuthEapLengthErrorFramesRx=%u\n"
                          "dot1xAuthLastEapolFrameVersion=%u\n"
                          "dot1xAuthLastEapolFrameSource=" MACSTR "\n",
                          sm->dot1xAuthEapolFramesRx,
                          sm->dot1xAuthEapolFramesTx,
                          sm->dot1xAuthEapolStartFramesRx,
                          sm->dot1xAuthEapolLogoffFramesRx,
                          sm->dot1xAuthEapolRespIdFramesRx,
                          sm->dot1xAuthEapolRespFramesRx,
                          sm->dot1xAuthEapolReqIdFramesTx,
                          sm->dot1xAuthEapolReqFramesTx,
                          sm->dot1xAuthInvalidEapolFramesRx,
                          sm->dot1xAuthEapLengthErrorFramesRx,
                          sm->dot1xAuthLastEapolFrameVersion,
                          MAC2STR(sm->addr));
        if (ret < 0 || (size_t) ret >= buflen - len)
                return len;
        len += ret;

        /* dot1xAuthDiagTable */
        ret = os_snprintf(buf + len, buflen - len,
                          "dot1xAuthEntersConnecting=%u\n"
                          "dot1xAuthEapLogoffsWhileConnecting=%u\n"
                          "dot1xAuthEntersAuthenticating=%u\n"
                          "dot1xAuthAuthSuccessesWhileAuthenticating=%u\n"
                          "dot1xAuthAuthTimeoutsWhileAuthenticating=%u\n"
                          "dot1xAuthAuthFailWhileAuthenticating=%u\n"
                          "dot1xAuthAuthEapStartsWhileAuthenticating=%u\n"
                          "dot1xAuthAuthEapLogoffWhileAuthenticating=%u\n"
                          "dot1xAuthAuthReauthsWhileAuthenticated=%u\n"
                          "dot1xAuthAuthEapStartsWhileAuthenticated=%u\n"
                          "dot1xAuthAuthEapLogoffWhileAuthenticated=%u\n"
                          "dot1xAuthBackendResponses=%u\n"
                          "dot1xAuthBackendAccessChallenges=%u\n"
                          "dot1xAuthBackendOtherRequestsToSupplicant=%u\n"
                          "dot1xAuthBackendAuthSuccesses=%u\n"
                          "dot1xAuthBackendAuthFails=%u\n",
                          sm->authEntersConnecting,
                          sm->authEapLogoffsWhileConnecting,
                          sm->authEntersAuthenticating,
                          sm->authAuthSuccessesWhileAuthenticating,
                          sm->authAuthTimeoutsWhileAuthenticating,
                          sm->authAuthFailWhileAuthenticating,
                          sm->authAuthEapStartsWhileAuthenticating,
                          sm->authAuthEapLogoffWhileAuthenticating,
                          sm->authAuthReauthsWhileAuthenticated,
                          sm->authAuthEapStartsWhileAuthenticated,
                          sm->authAuthEapLogoffWhileAuthenticated,
                          sm->backendResponses,
                          sm->backendAccessChallenges,
                          sm->backendOtherRequestsToSupplicant,
                          sm->backendAuthSuccesses,
                          sm->backendAuthFails);
        if (ret < 0 || (size_t) ret >= buflen - len)
                return len;
        len += ret;

        /* dot1xAuthSessionStatsTable */
        ret = os_snprintf(buf + len, buflen - len,
                          /* TODO: dot1xAuthSessionOctetsRx */
                          /* TODO: dot1xAuthSessionOctetsTx */
                          /* TODO: dot1xAuthSessionFramesRx */
                          /* TODO: dot1xAuthSessionFramesTx */
                          "dot1xAuthSessionId=%08X-%08X\n"
                          "dot1xAuthSessionAuthenticMethod=%d\n"
                          "dot1xAuthSessionTime=%u\n"
                          "dot1xAuthSessionTerminateCause=999\n"
                          "dot1xAuthSessionUserName=%s\n",
                          sta->acct_session_id_hi, sta->acct_session_id_lo,
                          (wpa_key_mgmt_wpa_ieee8021x(
                                   wpa_auth_sta_key_mgmt(sta->wpa_sm))) ?
                          1 : 2,
                          (unsigned int) (time(NULL) -
                                          sta->acct_session_start),
                          sm->identity);
        if (ret < 0 || (size_t) ret >= buflen - len)
                return len;
        len += ret;

        return len;
}


static void ieee802_1x_finished(struct hostapd_data *hapd,
                                struct sta_info *sta, int success)
{
        const u8 *key;
        size_t len;
        /* TODO: get PMKLifetime from WPA parameters */
        static const int dot11RSNAConfigPMKLifetime = 43200;

        key = ieee802_1x_get_key(sta->eapol_sm, &len);
        if (success && key && len >= PMK_LEN &&
            wpa_auth_pmksa_add(sta->wpa_sm, key, dot11RSNAConfigPMKLifetime,
                               sta->eapol_sm) == 0) {
                hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_WPA,
                               HOSTAPD_LEVEL_DEBUG,
                               "Added PMKSA cache entry (IEEE 802.1X)");
        }
}