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fragattacks/hostapd/ieee802_1x.c
Jouni Malinen 22a7f39f23 Remove unused hostapd reconfig code
2009-12-06 18:48:30 +02:00

2003 lines
55 KiB
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/*
* hostapd / IEEE 802.1X-2004 Authenticator
* Copyright (c) 2002-2008, 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 "crypto/md5.h"
#include "crypto/crypto.h"
#include "common/ieee802_11_defs.h"
#include "common/wpa_ctrl.h"
#include "radius/radius.h"
#include "radius/radius_client.h"
#include "eapol_auth/eapol_auth_sm.h"
#include "eapol_auth/eapol_auth_sm_i.h"
#include "hostapd.h"
#include "ieee802_1x.h"
#include "accounting.h"
#include "sta_flags.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"
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 */
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_server_get_name(0, 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;
}
}
static struct eapol_state_machine *
ieee802_1x_alloc_eapol_sm(struct hostapd_data *hapd, struct sta_info *sta)
{
int flags = 0;
if (sta->flags & WLAN_STA_PREAUTH)
flags |= EAPOL_SM_PREAUTH;
if (sta->wpa_sm) {
if (wpa_auth_sta_get_pmksa(sta->wpa_sm))
flags |= EAPOL_SM_USES_WPA;
if (wpa_auth_sta_get_pmksa(sta->wpa_sm))
flags |= EAPOL_SM_FROM_PMKSA_CACHE;
}
return eapol_auth_alloc(hapd->eapol_auth, sta->addr, flags,
sta->wps_ie, sta);
}
/**
* ieee802_1x_receive - Process the EAPOL frames from the Supplicant
* @hapd: hostapd BSS data
* @sa: Source address (sender of the EAPOL frame)
* @buf: EAPOL frame
* @len: Length of buf in octets
*
* This function is called for each incoming EAPOL frame from the interface
*/
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 = ieee802_1x_alloc_eapol_sm(hapd, 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);
}
/**
* ieee802_1x_new_station - Start IEEE 802.1X authentication
* @hapd: hostapd BSS data
* @sta: The station
*
* This function is called to start IEEE 802.1X authentication when a new
* station completes IEEE 802.11 association.
*/
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 = ieee802_1x_alloc_eapol_sm(hapd, 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_server_get_name(0, eap_type) :
"??",
eap_type);
break;
case EAP_CODE_RESPONSE:
os_snprintf(buf, sizeof(buf), "EAP Response-%s (%d)",
eap_type >= 0 ? eap_server_get_name(0, 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;
}
/**
* ieee802_1x_receive_auth - Process RADIUS frames from Authentication Server
* @msg: RADIUS response message
* @req: RADIUS request message
* @shared_secret: RADIUS shared secret
* @shared_secret_len: Length of shared_secret in octets
* @data: Context data (struct hostapd_data *)
* Returns: Processing status
*/
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->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;
}
}
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);
}
static void ieee802_1x_eapol_event(void *ctx, void *sta_ctx,
enum eapol_event type)
{
/* struct hostapd_data *hapd = ctx; */
struct sta_info *sta = sta_ctx;
switch (type) {
case EAPOL_AUTH_SM_CHANGE:
wpa_auth_sm_notify(sta->wpa_sm);
break;
case EAPOL_AUTH_REAUTHENTICATE:
wpa_auth_sm_event(sta->wpa_sm, WPA_REAUTH_EAPOL);
break;
}
}
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.ctx = 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;
cb.eapol_event = ieee802_1x_eapol_event;
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_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)");
}
}
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