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freebsd-skq/contrib/hostapd/ieee802_1x.c
sam d6843a35be fix botched MFC of eapol version override 
Reminded by:	Dominique Goncalves
2006-09-01 20:21:17 +00:00

1791 lines
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/*
* Host AP (software wireless LAN access point) user space daemon for
* Host AP kernel driver / IEEE 802.1X Authenticator
* Copyright (c) 2002-2005, Jouni Malinen <jkmaline@cc.hut.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.
*
* $FreeBSD$
*/
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <netinet/in.h>
#include <string.h>
#include <sys/ioctl.h>
#include <signal.h>
#include <assert.h>
#include <time.h>
#include <sys/time.h>
#include <sys/socket.h>
#include "hostapd.h"
#include "ieee802_1x.h"
#include "accounting.h"
#include "radius.h"
#include "radius_client.h"
#include "eapol_sm.h"
#include "md5.h"
#include "rc4.h"
#include "eloop.h"
#include "sta_info.h"
#include "wpa.h"
#include "driver.h"
#include "eap.h"
static void ieee802_1x_new_auth_session(struct hostapd_data *hapd,
struct sta_info *sta);
static void ieee802_1x_send(hostapd *hapd, struct sta_info *sta, u8 type,
u8 *data, size_t datalen)
{
u8 *buf;
struct ieee802_1x_hdr *xhdr;
size_t len;
int encrypt = 0;
len = sizeof(*xhdr) + datalen;
buf = malloc(len);
if (buf == NULL) {
printf("malloc() failed for ieee802_1x_send(len=%lu)\n",
(unsigned long) len);
return;
}
memset(buf, 0, len);
#if 0
/* TODO:
* According to IEEE 802.1aa/D4 EAPOL-Key should be sent before any
* remaining EAP frames, if possible. This would allow rest of the
* frames to be encrypted. This code could be used to request
* encryption from the kernel driver. */
if (sta->eapol_sm &&
sta->eapol_sm->be_auth.state == BE_AUTH_SUCCESS &&
sta->eapol_sm->keyTxEnabled)
encrypt = 1;
#endif
xhdr = (struct ieee802_1x_hdr *) buf;
xhdr->version = hapd->conf->eapol_version;
xhdr->type = type;
xhdr->length = htons(datalen);
if (datalen > 0 && data != NULL)
memcpy(xhdr + 1, data, datalen);
if (sta->wpa_sm && sta->wpa_sm->pairwise_set)
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);
}
free(buf);
}
void ieee802_1x_set_sta_authorized(hostapd *hapd, struct sta_info *sta,
int authorized)
{
if (sta->flags & WLAN_STA_PREAUTH)
return;
if (authorized) {
sta->flags |= WLAN_STA_AUTHORIZED;
hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE8021X,
HOSTAPD_LEVEL_DEBUG, "authorizing port");
} else {
sta->flags &= ~WLAN_STA_AUTHORIZED;
hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE8021X,
HOSTAPD_LEVEL_DEBUG, "unauthorizing port");
}
hostapd_set_sta_authorized(hapd, sta->addr, authorized);
if (authorized)
accounting_sta_start(hapd, sta);
}
static void ieee802_1x_eap_timeout(void *eloop_ctx, void *timeout_ctx)
{
struct sta_info *sta = eloop_ctx;
struct eapol_state_machine *sm = sta->eapol_sm;
if (sm == NULL)
return;
hostapd_logger(sm->hapd, sta->addr, HOSTAPD_MODULE_IEEE8021X,
HOSTAPD_LEVEL_DEBUG, "EAP timeout");
sm->eapTimeout = TRUE;
eapol_sm_step(sm);
}
void ieee802_1x_request_identity(struct hostapd_data *hapd,
struct sta_info *sta)
{
u8 *buf;
struct eap_hdr *eap;
int tlen;
u8 *pos;
struct eapol_state_machine *sm = sta->eapol_sm;
if (hapd->conf->eap_server) {
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
"IEEE 802.1X: Integrated EAP server in "
"use - do not generate EAP-Request/Identity\n");
return;
}
if (sm == NULL || !sm->auth_pae.eapRestart)
return;
ieee802_1x_new_auth_session(hapd, sta);
tlen = sizeof(*eap) + 1 + hapd->conf->eap_req_id_text_len;
buf = malloc(tlen);
if (buf == NULL) {
printf("Could not allocate memory for identity request\n");
return;
}
memset(buf, 0, tlen);
eap = (struct eap_hdr *) buf;
eap->code = EAP_CODE_REQUEST;
eap->identifier = ++sm->currentId;
eap->length = htons(tlen);
pos = (u8 *) (eap + 1);
*pos++ = EAP_TYPE_IDENTITY;
if (hapd->conf->eap_req_id_text) {
memcpy(pos, hapd->conf->eap_req_id_text,
hapd->conf->eap_req_id_text_len);
}
sm->be_auth.eapReq = TRUE;
free(sm->last_eap_radius);
sm->last_eap_radius = buf;
sm->last_eap_radius_len = tlen;
eloop_cancel_timeout(ieee802_1x_eap_timeout, sta, NULL);
eloop_register_timeout(30, 0, ieee802_1x_eap_timeout, sta, NULL);
sm->eapTimeout = FALSE;
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
"IEEE 802.1X: Generated EAP Request-Identity for " MACSTR
" (identifier %d, timeout 30)\n", MAC2STR(sta->addr),
eap->identifier);
sm->auth_pae.eapRestart = FALSE;
}
void ieee802_1x_tx_canned_eap(struct hostapd_data *hapd, struct sta_info *sta,
int success)
{
struct eap_hdr eap;
struct eapol_state_machine *sm = sta->eapol_sm;
memset(&eap, 0, sizeof(eap));
eap.code = success ? EAP_CODE_SUCCESS : EAP_CODE_FAILURE;
eap.identifier = 1;
if (sm && sm->last_eap_radius) {
struct eap_hdr *hdr = (struct eap_hdr *) sm->last_eap_radius;
eap.identifier = hdr->identifier + 1;
}
eap.length = htons(sizeof(eap));
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
"IEEE 802.1X: Sending canned EAP packet %s to " MACSTR
" (identifier %d)\n", success ? "SUCCESS" : "FAILURE",
MAC2STR(sta->addr), eap.identifier);
ieee802_1x_send(hapd, sta, IEEE802_1X_TYPE_EAP_PACKET, (u8 *) &eap,
sizeof(eap));
if (sm)
sm->dot1xAuthEapolFramesTx++;
}
void ieee802_1x_tx_req(struct hostapd_data *hapd, struct sta_info *sta)
{
struct eap_hdr *eap;
struct eapol_state_machine *sm = sta->eapol_sm;
u8 *type;
if (sm == NULL)
return;
if (sm->last_eap_radius == NULL) {
printf("Error: TxReq called for station " MACSTR ", but there "
"is no EAP request from the authentication server\n",
MAC2STR(sm->addr));
return;
}
eap = (struct eap_hdr *) sm->last_eap_radius;
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
"IEEE 802.1X: Sending EAP Packet to " MACSTR
" (identifier %d)\n", MAC2STR(sm->addr),
eap->identifier);
sm->currentId = eap->identifier;
ieee802_1x_send(hapd, sta, IEEE802_1X_TYPE_EAP_PACKET,
sm->last_eap_radius, sm->last_eap_radius_len);
sm->dot1xAuthEapolFramesTx++;
type = (u8 *) (eap + 1);
if (sm->last_eap_radius_len > sizeof(*eap) &&
*type == EAP_TYPE_IDENTITY)
sm->dot1xAuthEapolReqIdFramesTx++;
else
sm->dot1xAuthEapolReqFramesTx++;
}
void hostapd_get_ntp_timestamp(u8 *buf)
{
struct timeval now;
u32 sec, usec;
/* 64-bit NTP timestamp (time from 1900-01-01 00:00:00) */
gettimeofday(&now, NULL);
sec = htonl(now.tv_sec + 2208988800U); /* Epoch to 1900 */
/* Estimate 2^32/10^6 = 4295 - 1/32 - 1/512 */
usec = now.tv_usec;
usec = htonl(4295 * usec - (usec >> 5) - (usec >> 9));
memcpy(buf, (u8 *) &sec, 4);
memcpy(buf + 4, (u8 *) &usec, 4);
}
static void ieee802_1x_tx_key_one(hostapd *hapd, struct sta_info *sta,
int index, 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 = malloc(sizeof(*hdr) + len);
if (buf == NULL)
return;
memset(buf, 0, sizeof(*hdr) + len);
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);
hostapd_get_ntp_timestamp(key->replay_counter);
if (hostapd_get_rand(key->key_iv, sizeof(key->key_iv))) {
printf("Could not get random numbers\n");
free(buf);
return;
}
key->key_index = index | (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 + sm->eapol_key_crypt" as the
* RC4-key */
memcpy((u8 *) (key + 1), key_data, key_len);
ekey_len = sizeof(key->key_iv) + sm->eapol_key_crypt_len;
ekey = malloc(ekey_len);
if (ekey == NULL) {
printf("Could not encrypt key\n");
free(buf);
return;
}
memcpy(ekey, key->key_iv, sizeof(key->key_iv));
memcpy(ekey + sizeof(key->key_iv), sm->eapol_key_crypt,
sm->eapol_key_crypt_len);
rc4((u8 *) (key + 1), key_len, ekey, ekey_len);
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 = htons(len);
hmac_md5(sm->eapol_key_sign, sm->eapol_key_sign_len,
buf, sizeof(*hdr) + len,
key->key_signature);
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
"IEEE 802.1X: Sending EAPOL-Key to " MACSTR
" (%s index=%d)\n", MAC2STR(sm->addr),
broadcast ? "broadcast" : "unicast", index);
ieee802_1x_send(hapd, sta, IEEE802_1X_TYPE_EAPOL_KEY, (u8 *) key, len);
if (sta->eapol_sm)
sta->eapol_sm->dot1xAuthEapolFramesTx++;
free(buf);
}
void ieee802_1x_tx_key(struct hostapd_data *hapd, struct sta_info *sta)
{
struct eapol_state_machine *sm = sta->eapol_sm;
if (sm == NULL || !sm->eapol_key_sign || !sm->eapol_key_crypt)
return;
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
"IEEE 802.1X: Sending EAPOL-Key(s) to " MACSTR "\n",
MAC2STR(sta->addr));
if (hapd->default_wep_key)
ieee802_1x_tx_key_one(hapd, sta, hapd->default_wep_key_idx, 1,
hapd->default_wep_key,
hapd->conf->default_wep_key_len);
if (hapd->conf->individual_wep_key_len > 0) {
u8 *ikey;
ikey = malloc(hapd->conf->individual_wep_key_len);
if (ikey == NULL ||
hostapd_get_rand(ikey,
hapd->conf->individual_wep_key_len)) {
printf("Could not generate random individual WEP "
"key.\n");
free(ikey);
return;
}
if (HOSTAPD_DEBUG_COND(HOSTAPD_DEBUG_MINIMAL))
hostapd_hexdump("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_encryption(hapd, "WEP", sta->addr, 0, ikey,
hapd->conf->
individual_wep_key_len)) {
printf("Could not set individual WEP encryption.\n");
}
free(ikey);
}
}
static void ieee802_1x_encapsulate_radius(hostapd *hapd, struct sta_info *sta,
u8 *eap, size_t len)
{
struct radius_msg *msg;
char buf[128];
struct eapol_state_machine *sm = sta->eapol_sm;
if (sm == NULL)
return;
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
"Encapsulating EAP message into a RADIUS packet\n");
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,
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;
}
snprintf(buf, sizeof(buf), RADIUS_802_1X_ADDR_FORMAT ":%s",
MAC2STR(hapd->own_addr), hapd->conf->ssid);
if (!radius_msg_add_attr(msg, RADIUS_ATTR_CALLED_STATION_ID,
(u8 *) buf, strlen(buf))) {
printf("Could not add Called-Station-Id\n");
goto fail;
}
snprintf(buf, sizeof(buf), RADIUS_802_1X_ADDR_FORMAT,
MAC2STR(sta->addr));
if (!radius_msg_add_attr(msg, RADIUS_ATTR_CALLING_STATION_ID,
(u8 *) buf, 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;
}
snprintf(buf, sizeof(buf), "CONNECT 11Mbps 802.11b");
if (!radius_msg_add_attr(msg, RADIUS_ATTR_CONNECT_INFO,
(u8 *) buf, 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) {
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
" Copied RADIUS State Attribute\n");
}
}
radius_client_send(hapd->radius, msg, RADIUS_AUTH, sta->addr);
return;
fail:
radius_msg_free(msg);
free(msg);
}
static 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";
default: return "Unknown";
}
}
static void handle_eap_response(hostapd *hapd, struct sta_info *sta,
struct eap_hdr *eap, u8 *data, size_t len)
{
u8 type;
struct eapol_state_machine *sm = sta->eapol_sm;
if (sm == NULL)
return;
if (eap->identifier != sm->currentId) {
hostapd_logger(hapd, sm->addr, HOSTAPD_MODULE_IEEE8021X,
HOSTAPD_LEVEL_DEBUG,
"EAP Identifier of the Response-Identity does "
"not match (was %d, expected %d) - ignored",
eap->identifier, sm->currentId);
return;
}
if (len < 1) {
printf("handle_eap_response: too short response data\n");
return;
}
eloop_cancel_timeout(ieee802_1x_eap_timeout, sta, NULL);
free(sm->last_eap_supp);
sm->last_eap_supp_len = sizeof(*eap) + len;
sm->last_eap_supp = (u8 *) malloc(sm->last_eap_supp_len);
if (sm->last_eap_supp == NULL) {
printf("Could not alloc memory for last EAP Response\n");
return;
}
memcpy(sm->last_eap_supp, eap, sizeof(*eap));
memcpy(sm->last_eap_supp + sizeof(*eap), data, len);
type = data[0];
data++;
len--;
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, ntohs(eap->length),
eap_type_text(type), type);
if (type == EAP_TYPE_IDENTITY) {
char *buf, *pos;
int i;
buf = malloc(4 * len + 1);
if (buf) {
pos = buf;
for (i = 0; i < len; i++) {
if (data[i] >= 32 && data[i] < 127)
*pos++ = data[i];
else {
snprintf(pos, 5, "{%02x}", data[i]);
pos += 4;
}
}
*pos = '\0';
hostapd_logger(hapd, sm->addr,
HOSTAPD_MODULE_IEEE8021X,
HOSTAPD_LEVEL_DEBUG,
"STA identity '%s'", buf);
free(buf);
}
sm->rx_identity = TRUE;
sm->dot1xAuthEapolRespIdFramesRx++;
/* Save station identity for future RADIUS packets */
free(sm->identity);
sm->identity = malloc(len + 1);
if (sm->identity) {
memcpy(sm->identity, data, len);
sm->identity[len] = '\0';
sm->identity_len = len;
}
} else
sm->dot1xAuthEapolRespFramesRx++;
sm->eapolEap = TRUE;
}
/* Process incoming EAP packet from Supplicant */
static void handle_eap(hostapd *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 = ntohs(eap->length);
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
" EAP: code=%d identifier=%d length=%d",
eap->code, eap->identifier, eap_len);
if (eap_len < sizeof(*eap)) {
printf(" Invalid EAP length\n");
return;
} else if (eap_len > len) {
printf(" Too short frame to contain this EAP packet\n");
return;
} else if (eap_len < len) {
printf(" Ignoring %lu extra bytes after EAP packet\n",
(unsigned long) len - eap_len);
}
eap_len -= sizeof(*eap);
switch (eap->code) {
case EAP_CODE_REQUEST:
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, " (request)\n");
return;
case EAP_CODE_RESPONSE:
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, " (response)\n");
handle_eap_response(hapd, sta, eap, (u8 *) (eap + 1), eap_len);
break;
case EAP_CODE_SUCCESS:
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, " (success)\n");
return;
case EAP_CODE_FAILURE:
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, " (failure)\n");
return;
default:
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, " (unknown code)\n");
return;
}
}
/* Process the EAPOL frames from the Supplicant */
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;
if (!hapd->conf->ieee802_1x && !hapd->conf->wpa)
return;
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
"IEEE 802.1X: %lu bytes from " MACSTR "\n",
(unsigned long) len, MAC2STR(sa));
sta = ap_get_sta(hapd, sa);
if (!sta) {
printf(" no station information available\n");
return;
}
if (len < sizeof(*hdr)) {
printf(" too short IEEE 802.1X packet\n");
return;
}
hdr = (struct ieee802_1x_hdr *) buf;
datalen = ntohs(hdr->length);
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
" IEEE 802.1X: version=%d type=%d length=%d\n",
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) {
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
" ignoring %lu extra octets after IEEE 802.1X "
"packet\n",
(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, sta, (u8 *) hdr, sizeof(*hdr) + datalen);
return;
}
if (!hapd->conf->ieee802_1x || sta->wpa_key_mgmt == WPA_KEY_MGMT_PSK)
return;
if (!sta->eapol_sm) {
sta->eapol_sm = eapol_sm_alloc(hapd, sta);
if (!sta->eapol_sm)
return;
}
/* 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");
if (sta->pmksa) {
hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_WPA,
HOSTAPD_LEVEL_DEBUG, "cached PMKSA "
"available - ignore it since "
"STA sent EAPOL-Start");
sta->pmksa = NULL;
}
sta->eapol_sm->auth_pae.eapolStart = TRUE;
sta->eapol_sm->dot1xAuthEapolStartFramesRx++;
wpa_sm_event(hapd, sta, 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;
sta->eapol_sm->auth_pae.eapolLogoff = TRUE;
sta->eapol_sm->dot1xAuthEapolLogoffFramesRx++;
break;
case IEEE802_1X_TYPE_EAPOL_KEY:
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, " EAPOL-Key\n");
if (!(sta->flags & WLAN_STA_AUTHORIZED)) {
printf(" Dropped key data from unauthorized "
"Supplicant\n");
break;
}
break;
case IEEE802_1X_TYPE_EAPOL_ENCAPSULATED_ASF_ALERT:
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
" EAPOL-Encapsulated-ASF-Alert\n");
/* TODO: implement support for this; show data */
break;
default:
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
" unknown IEEE 802.1X packet type\n");
sta->eapol_sm->dot1xAuthInvalidEapolFramesRx++;
break;
}
eapol_sm_step(sta->eapol_sm);
}
void ieee802_1x_new_station(hostapd *hapd, struct sta_info *sta)
{
if (!hapd->conf->ieee802_1x || sta->wpa_key_mgmt == WPA_KEY_MGMT_PSK)
return;
if (sta->eapol_sm == NULL) {
hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE8021X,
HOSTAPD_LEVEL_DEBUG, "start authentication");
sta->eapol_sm = eapol_sm_alloc(hapd, sta);
if (sta->eapol_sm == NULL) {
hostapd_logger(hapd, sta->addr,
HOSTAPD_MODULE_IEEE8021X,
HOSTAPD_LEVEL_INFO,
"failed to allocate state machine");
return;
}
}
sta->eapol_sm->portEnabled = TRUE;
if (sta->pmksa) {
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->keyAvailable = 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);
} else
eapol_sm_step(sta->eapol_sm);
}
void ieee802_1x_free_radius_class(struct radius_class_data *class)
{
int i;
if (class == NULL)
return;
for (i = 0; i < class->count; i++)
free(class->attr[i].data);
free(class->attr);
class->attr = NULL;
class->count = 0;
}
int ieee802_1x_copy_radius_class(struct radius_class_data *dst,
struct radius_class_data *src)
{
size_t i;
if (src->attr == NULL)
return 0;
dst->attr = malloc(src->count * sizeof(struct radius_attr_data));
if (dst->attr == NULL)
return -1;
memset(dst->attr, 0, src->count * sizeof(struct radius_attr_data));
dst->count = 0;
for (i = 0; i < src->count; i++) {
dst->attr[i].data = malloc(src->attr[i].len);
if (dst->attr[i].data == NULL)
break;
dst->count++;
memcpy(dst->attr[i].data, src->attr[i].data, src->attr[i].len);
dst->attr[i].len = src->attr[i].len;
}
return 0;
}
void ieee802_1x_free_station(struct sta_info *sta)
{
struct eapol_state_machine *sm = sta->eapol_sm;
eloop_cancel_timeout(ieee802_1x_eap_timeout, sta, NULL);
if (sm == NULL)
return;
sta->eapol_sm = NULL;
if (sm->last_recv_radius) {
radius_msg_free(sm->last_recv_radius);
free(sm->last_recv_radius);
}
free(sm->last_eap_supp);
free(sm->last_eap_radius);
free(sm->identity);
ieee802_1x_free_radius_class(&sm->radius_class);
free(sm->eapol_key_sign);
free(sm->eapol_key_crypt);
eapol_sm_free(sm);
}
static void ieee802_1x_decapsulate_radius(hostapd *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->be_auth.eapNoReq = TRUE;
return;
}
msg = sm->last_recv_radius;
eap = radius_msg_get_eap(msg, &len);
if (eap == NULL) {
/* draft-aboba-radius-rfc2869bis-20.txt, 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");
free(sm->last_eap_radius);
sm->last_eap_radius = NULL;
sm->last_eap_radius_len = 0;
sm->be_auth.eapNoReq = 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");
free(eap);
sm->be_auth.eapNoReq = TRUE;
return;
}
if (len > sizeof(*hdr))
eap_type = eap[sizeof(*hdr)];
hdr = (struct eap_hdr *) eap;
switch (hdr->code) {
case EAP_CODE_REQUEST:
snprintf(buf, sizeof(buf), "EAP-Request-%s (%d)",
eap_type >= 0 ? eap_type_text(eap_type) : "??",
eap_type);
break;
case EAP_CODE_RESPONSE:
snprintf(buf, sizeof(buf), "EAP Response-%s (%d)",
eap_type >= 0 ? eap_type_text(eap_type) : "??",
eap_type);
break;
case EAP_CODE_SUCCESS:
snprintf(buf, sizeof(buf), "EAP Success");
break;
case EAP_CODE_FAILURE:
snprintf(buf, sizeof(buf), "EAP Failure");
break;
default:
snprintf(buf, sizeof(buf), "unknown EAP code");
break;
}
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, ntohs(hdr->length), buf);
sm->be_auth.eapReq = TRUE;
free(sm->last_eap_radius);
sm->last_eap_radius = eap;
sm->last_eap_radius_len = len;
}
static void ieee802_1x_get_keys(hostapd *hapd, struct sta_info *sta,
struct radius_msg *msg, struct radius_msg *req,
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) {
if (HOSTAPD_DEBUG_COND(HOSTAPD_DEBUG_MINIMAL) && keys->send) {
size_t i;
printf("MS-MPPE-Send-Key (len=%lu):",
(unsigned long) keys->send_len);
for (i = 0; i < keys->send_len; i++)
printf(" %02x", keys->send[i]);
printf("\n");
}
if (HOSTAPD_DEBUG_COND(HOSTAPD_DEBUG_MINIMAL) && keys->recv) {
size_t i;
printf("MS-MPPE-Recv-Key (len=%lu):",
(unsigned long) keys->recv_len);
for (i = 0; i < keys->recv_len; i++)
printf(" %02x", keys->recv[i]);
printf("\n");
}
if (keys->send && keys->recv) {
free(sm->eapol_key_sign);
free(sm->eapol_key_crypt);
sm->eapol_key_sign = keys->send;
sm->eapol_key_sign_len = keys->send_len;
sm->eapol_key_crypt = keys->recv;
sm->eapol_key_crypt_len = keys->recv_len;
if (hapd->default_wep_key ||
hapd->conf->individual_wep_key_len > 0 ||
hapd->conf->wpa)
sta->eapol_sm->keyAvailable = TRUE;
} else {
free(keys->send);
free(keys->recv);
}
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;
ieee802_1x_free_radius_class(&sm->radius_class);
count = radius_msg_count_attr(msg, RADIUS_ATTR_CLASS, 1);
if (count <= 0)
return;
nclass = malloc(count * sizeof(struct radius_attr_data));
if (nclass == NULL)
return;
nclass_count = 0;
memset(nclass, 0, count * sizeof(struct radius_attr_data));
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 = malloc(class_len);
if (nclass[nclass_count].data == NULL)
break;
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;
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "IEEE 802.1X: Stored %lu RADIUS "
"Class attributes for " MACSTR "\n",
(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 = malloc(len + 1);
if (identity == NULL)
return;
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);
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;
}
/* Process the RADIUS frames from Authentication Server */
static RadiusRxResult
ieee802_1x_receive_auth(struct radius_msg *msg, struct radius_msg *req,
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;
int eap_timeout;
struct eapol_state_machine *sm;
int override_eapReq = 0;
sm = ieee802_1x_search_radius_identifier(hapd, msg->hdr->identifier);
if (sm == NULL) {
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "IEEE 802.1X: Could not "
"find matching station for this RADIUS "
"message\n");
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) {
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "Allowing RADIUS "
"Access-Reject without Message-Authenticator "
"since it does not include EAP-Message\n");
} 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;
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
"RADIUS packet matching with station " MACSTR "\n",
MAC2STR(sta->addr));
if (sm->last_recv_radius) {
radius_msg_free(sm->last_recv_radius);
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:
/* RFC 3580, Ch. 3.17 */
if (session_timeout_set && termination_action ==
RADIUS_TERMINATION_ACTION_RADIUS_REQUEST) {
sm->reauth_timer.reAuthPeriod = session_timeout;
} else if (session_timeout_set)
ap_sta_session_timeout(hapd, sta, session_timeout);
sm->eapSuccess = 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->keyAvailable) {
pmksa_cache_add(hapd, sta, sm->eapol_key_crypt,
session_timeout_set ?
session_timeout : -1);
}
break;
case RADIUS_CODE_ACCESS_REJECT:
sm->eapFail = TRUE;
override_eapReq = 1;
break;
case RADIUS_CODE_ACCESS_CHALLENGE:
if (session_timeout_set) {
/* RFC 2869, Ch. 2.3.2; RFC 3580, Ch. 3.17 */
eap_timeout = session_timeout;
} else
eap_timeout = 30;
hostapd_logger(hapd, sm->addr, HOSTAPD_MODULE_IEEE8021X,
HOSTAPD_LEVEL_DEBUG,
"using EAP timeout of %d seconds%s",
eap_timeout,
session_timeout_set ? " (from RADIUS)" : "");
eloop_cancel_timeout(ieee802_1x_eap_timeout, sta, NULL);
eloop_register_timeout(eap_timeout, 0, ieee802_1x_eap_timeout,
sta, NULL);
sm->eapTimeout = FALSE;
break;
}
ieee802_1x_decapsulate_radius(hapd, sta);
if (override_eapReq)
sm->be_auth.eapReq = FALSE;
eapol_sm_step(sm);
return RADIUS_RX_QUEUED;
}
/* Handler for EAPOL Backend Authentication state machine sendRespToServer.
* Forward the EAP Response from Supplicant to Authentication Server. */
void ieee802_1x_send_resp_to_server(hostapd *hapd, struct sta_info *sta)
{
struct eapol_state_machine *sm = sta->eapol_sm;
if (sm == NULL)
return;
if (hapd->conf->eap_server) {
eap_set_eapRespData(sm->eap, sm->last_eap_supp,
sm->last_eap_supp_len);
} else {
ieee802_1x_encapsulate_radius(hapd, sta, sm->last_eap_supp,
sm->last_eap_supp_len);
}
}
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");
if (sm->last_recv_radius) {
radius_msg_free(sm->last_recv_radius);
free(sm->last_recv_radius);
sm->last_recv_radius = NULL;
}
free(sm->last_eap_supp);
sm->last_eap_supp = NULL;
sm->last_eap_supp_len = 0;
free(sm->last_eap_radius);
sm->last_eap_radius = NULL;
sm->last_eap_radius_len = 0;
}
void ieee802_1x_set_port_enabled(hostapd *hapd, struct sta_info *sta,
int enabled)
{
if (!sta->eapol_sm)
return;
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
"IEEE 802.1X: station " MACSTR " port %s\n",
MAC2STR(sta->addr), enabled ? "enabled" : "disabled");
sta->eapol_sm->portEnabled = enabled ? TRUE : FALSE;
eapol_sm_step(sta->eapol_sm);
}
#ifdef HOSTAPD_DUMP_STATE
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, "%scached_packets=%s%s%s\n", prefix,
sm->last_recv_radius ? "[RX RADIUS]" : "",
sm->last_eap_radius ? "[EAP RADIUS]" : "",
sm->last_eap_supp ? "[EAP SUPPLICANT]" : "");
eapol_sm_dump_state(f, prefix, sm);
}
#endif /* HOSTAPD_DUMP_STATE */
static int ieee802_1x_rekey_broadcast(hostapd *hapd)
{
if (hapd->conf->default_wep_key_len < 1)
return 0;
free(hapd->default_wep_key);
hapd->default_wep_key = malloc(hapd->conf->default_wep_key_len);
if (hapd->default_wep_key == NULL ||
hostapd_get_rand(hapd->default_wep_key,
hapd->conf->default_wep_key_len)) {
printf("Could not generate random WEP key.\n");
free(hapd->default_wep_key);
hapd->default_wep_key = NULL;
return -1;
}
if (HOSTAPD_DEBUG_COND(HOSTAPD_DEBUG_MINIMAL)) {
hostapd_hexdump("IEEE 802.1X: New default WEP key",
hapd->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->keyAvailable = TRUE;
eapol_sm_step(sta->eapol_sm);
}
return 0;
}
static void ieee802_1x_rekey(void *eloop_ctx, void *timeout_ctx)
{
struct hostapd_data *hapd = eloop_ctx;
if (hapd->default_wep_key_idx >= 3)
hapd->default_wep_key_idx =
hapd->conf->individual_wep_key_len > 0 ? 1 : 0;
else
hapd->default_wep_key_idx++;
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "IEEE 802.1X: New default WEP "
"key index %d\n", hapd->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");
free(hapd->default_wep_key);
hapd->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_encryption(hapd, "WEP", NULL,
hapd->default_wep_key_idx,
hapd->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");
free(hapd->default_wep_key);
hapd->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);
}
}
int ieee802_1x_init(hostapd *hapd)
{
int i;
if ((hapd->conf->ieee802_1x || hapd->conf->wpa) &&
hostapd_set_ieee8021x(hapd, 1))
return -1;
if (radius_client_register(hapd->radius, RADIUS_AUTH,
ieee802_1x_receive_auth, hapd))
return -1;
if (hapd->conf->default_wep_key_len) {
for (i = 0; i < 4; i++)
hostapd_set_encryption(hapd, "none", NULL, i, NULL, 0);
ieee802_1x_rekey(hapd, NULL);
if (hapd->default_wep_key == NULL)
return -1;
}
return 0;
}
void ieee802_1x_deinit(hostapd *hapd)
{
if (hapd->driver != NULL &&
(hapd->conf->ieee802_1x || hapd->conf->wpa))
hostapd_set_ieee8021x(hapd, 0);
}
static void ieee802_1x_new_auth_session(struct hostapd_data *hapd,
struct sta_info *sta)
{
struct eapol_state_machine *sm = sta->eapol_sm;
if (sm == NULL)
return;
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
"IEEE 802.1X: station " MACSTR " - new auth session, "
"clearing State\n", MAC2STR(sta->addr));
if (sm->last_recv_radius) {
radius_msg_free(sm->last_recv_radius);
free(sm->last_recv_radius);
sm->last_recv_radius = NULL;
}
sm->eapSuccess = FALSE;
sm->eapFail = FALSE;
}
int ieee802_1x_tx_status(hostapd *hapd, struct sta_info *sta, u8 *buf,
size_t len, int ack)
{
struct ieee80211_hdr *hdr;
struct ieee802_1x_hdr *xhdr;
struct ieee802_1x_eapol_key *key;
u8 *pos;
if (sta == NULL)
return -1;
if (len < sizeof(*hdr) + sizeof(rfc1042_header) + 2 + sizeof(*xhdr))
return 0;
hdr = (struct ieee80211_hdr *) buf;
pos = (u8 *) (hdr + 1);
if (memcmp(pos, rfc1042_header, sizeof(rfc1042_header)) != 0)
return 0;
pos += sizeof(rfc1042_header);
if (((pos[0] << 8) | pos[1]) != ETH_P_PAE)
return 0;
pos += 2;
xhdr = (struct ieee802_1x_hdr *) pos;
pos += sizeof(*xhdr);
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "IEEE 802.1X: " MACSTR
" TX status - version=%d type=%d length=%d - ack=%d\n",
MAC2STR(sta->addr), xhdr->version, xhdr->type,
ntohs(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 >= sm->radius_class.count)
return NULL;
*len = sm->radius_class.attr[idx].len;
return sm->radius_class.attr[idx].data;
}
u8 * ieee802_1x_get_key_crypt(struct eapol_state_machine *sm, size_t *len)
{
if (sm == NULL)
return NULL;
*len = sm->eapol_key_crypt_len;
return sm->eapol_key_crypt;
}
void ieee802_1x_notify_port_enabled(struct eapol_state_machine *sm,
int enabled)
{
if (sm == NULL)
return;
sm->portEnabled = enabled ? TRUE : FALSE;
eapol_sm_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_sm_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;
struct eapol_state_machine *sm = sta->eapol_sm;
if (sm == NULL)
return 0;
len += snprintf(buf + len, buflen - len,
"dot1xPaePortNumber=%d\n"
"dot1xPaePortProtocolVersion=%d\n"
"dot1xPaePortCapabilities=1\n"
"dot1xPaePortInitialize=%d\n"
"dot1xPaePortReauthenticate=FALSE\n",
sta->aid,
hapd->conf->eapol_version,
sm->initialize);
/* dot1xAuthConfigTable */
len += 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->ctrl_dir.adminControlledDirections,
sm->ctrl_dir.operControlledDirections,
sm->authPortStatus,
sm->portControl,
sm->auth_pae.quietPeriod,
sm->be_auth.serverTimeout,
sm->reauth_timer.reAuthPeriod,
bool_txt(sm->reauth_timer.reAuthEnabled),
bool_txt(sm->keyTxEnabled));
/* dot1xAuthStatsTable */
len += 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));
/* dot1xAuthDiagTable */
len += 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->auth_pae.authEntersConnecting,
sm->auth_pae.authEapLogoffsWhileConnecting,
sm->auth_pae.authEntersAuthenticating,
sm->auth_pae.authAuthSuccessesWhileAuthenticating,
sm->auth_pae.authAuthTimeoutsWhileAuthenticating,
sm->auth_pae.authAuthFailWhileAuthenticating,
sm->auth_pae.authAuthEapStartsWhileAuthenticating,
sm->auth_pae.authAuthEapLogoffWhileAuthenticating,
sm->auth_pae.authAuthReauthsWhileAuthenticated,
sm->auth_pae.authAuthEapStartsWhileAuthenticated,
sm->auth_pae.authAuthEapLogoffWhileAuthenticated,
sm->be_auth.backendResponses,
sm->be_auth.backendAccessChallenges,
sm->be_auth.backendOtherRequestsToSupplicant,
sm->be_auth.backendAuthSuccesses,
sm->be_auth.backendAuthFails);
/* dot1xAuthSessionStatsTable */
len += 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,
sta->wpa_key_mgmt == WPA_KEY_MGMT_IEEE8021X ? 1 : 2,
(unsigned int) (time(NULL) - sta->acct_session_start),
sm->identity);
return len;
}
void ieee802_1x_finished(struct hostapd_data *hapd, struct sta_info *sta,
int success)
{
u8 *key;
size_t len;
/* TODO: get PMKLifetime from WPA parameters */
static const int dot11RSNAConfigPMKLifetime = 43200;
key = ieee802_1x_get_key_crypt(sta->eapol_sm, &len);
if (success && key) {
pmksa_cache_add(hapd, sta, key, dot11RSNAConfigPMKLifetime);
}
}
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