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NetBSD/dist/hostapd/ieee802_11.c

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/*
* Host AP (software wireless LAN access point) user space daemon for
* Host AP kernel driver / IEEE 802.11 Management
* 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.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <time.h>
#include "eloop.h"
#include "hostapd.h"
#include "ieee802_11.h"
#include "radius.h"
#include "radius_client.h"
#include "ieee802_11_auth.h"
#include "sta_info.h"
#include "eapol_sm.h"
#include "rc4.h"
#include "ieee802_1x.h"
#include "wpa.h"
#include "accounting.h"
#include "driver.h"
#include "hostap_common.h"
static u8 * hostapd_eid_supp_rates(hostapd *hapd, u8 *eid)
{
u8 *pos = eid;
*pos++ = WLAN_EID_SUPP_RATES;
*pos++ = 4; /* len */
*pos++ = 0x82; /* 1 Mbps, base set */
*pos++ = 0x84; /* 2 Mbps, base set */
*pos++ = 0x0b; /* 5.5 Mbps */
*pos++ = 0x16; /* 11 Mbps */
return pos;
}
static u16 hostapd_own_capab_info(hostapd *hapd)
{
int capab = WLAN_CAPABILITY_ESS;
if (hapd->conf->wpa ||
(hapd->conf->ieee802_1x &&
(hapd->conf->default_wep_key_len ||
hapd->conf->individual_wep_key_len)))
capab |= WLAN_CAPABILITY_PRIVACY;
return capab;
}
static const u8 WPA_OUI_TYPE[] = { 0x00, 0x50, 0xf2, 1 };
ParseRes ieee802_11_parse_elems(struct hostapd_data *hapd, u8 *start,
size_t len,
struct ieee802_11_elems *elems,
int show_errors)
{
size_t left = len;
u8 *pos = start;
int unknown = 0;
memset(elems, 0, sizeof(*elems));
while (left >= 2) {
u8 id, elen;
id = *pos++;
elen = *pos++;
left -= 2;
if (elen > left) {
if (show_errors) {
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
"IEEE 802.11 element parse "
"failed (id=%d elen=%d "
"left=%lu)\n",
id, elen, (unsigned long) left);
if (HOSTAPD_DEBUG_COND(HOSTAPD_DEBUG_MINIMAL))
hostapd_hexdump("IEs", start, len);
}
return ParseFailed;
}
switch (id) {
case WLAN_EID_SSID:
elems->ssid = pos;
elems->ssid_len = elen;
break;
case WLAN_EID_SUPP_RATES:
elems->supp_rates = pos;
elems->supp_rates_len = elen;
break;
case WLAN_EID_FH_PARAMS:
elems->fh_params = pos;
elems->fh_params_len = elen;
break;
case WLAN_EID_DS_PARAMS:
elems->ds_params = pos;
elems->ds_params_len = elen;
break;
case WLAN_EID_CF_PARAMS:
elems->cf_params = pos;
elems->cf_params_len = elen;
break;
case WLAN_EID_TIM:
elems->tim = pos;
elems->tim_len = elen;
break;
case WLAN_EID_IBSS_PARAMS:
elems->ibss_params = pos;
elems->ibss_params_len = elen;
break;
case WLAN_EID_CHALLENGE:
elems->challenge = pos;
elems->challenge_len = elen;
break;
case WLAN_EID_GENERIC:
if (elen > 4 && memcmp(pos, WPA_OUI_TYPE, 4) == 0) {
elems->wpa_ie = pos;
elems->wpa_ie_len = elen;
} else if (show_errors) {
HOSTAPD_DEBUG(HOSTAPD_DEBUG_EXCESSIVE,
"IEEE 802.11 element parse "
"ignored unknown generic element"
" (id=%d elen=%d OUI:type="
"%02x-%02x-%02x:%d)\n",
id, elen,
elen >= 1 ? pos[0] : 0,
elen >= 2 ? pos[1] : 0,
elen >= 3 ? pos[2] : 0,
elen >= 4 ? pos[3] : 0);
unknown++;
} else {
unknown++;
}
break;
case WLAN_EID_RSN:
elems->rsn_ie = pos;
elems->rsn_ie_len = elen;
break;
default:
unknown++;
if (!show_errors)
break;
HOSTAPD_DEBUG(HOSTAPD_DEBUG_EXCESSIVE,
"IEEE 802.11 element parse ignored "
"unknown element (id=%d elen=%d)\n",
id, elen);
break;
}
left -= elen;
pos += elen;
}
if (left)
return ParseFailed;
return unknown ? ParseUnknown : ParseOK;
}
static void ieee802_11_print_ssid(const u8 *ssid, u8 len)
{
int i;
for (i = 0; i < len; i++) {
if (ssid[i] >= 32 && ssid[i] < 127)
printf("%c", ssid[i]);
else
printf("<%02x>", ssid[i]);
}
}
static void ieee802_11_sta_authenticate(void *eloop_ctx, void *timeout_ctx)
{
hostapd *hapd = eloop_ctx;
struct ieee80211_mgmt mgmt;
if (hapd->assoc_ap_state == WAIT_BEACON)
hapd->assoc_ap_state = AUTHENTICATE;
if (hapd->assoc_ap_state != AUTHENTICATE)
return;
printf("Authenticate with AP " MACSTR " SSID=",
MAC2STR(hapd->conf->assoc_ap_addr));
ieee802_11_print_ssid((u8 *) hapd->assoc_ap_ssid,
hapd->assoc_ap_ssid_len);
printf(" (as station)\n");
memset(&mgmt, 0, sizeof(mgmt));
mgmt.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
WLAN_FC_STYPE_AUTH);
/* Request TX callback */
mgmt.frame_control |= host_to_le16(BIT(1));
memcpy(mgmt.da, hapd->conf->assoc_ap_addr, ETH_ALEN);
memcpy(mgmt.sa, hapd->own_addr, ETH_ALEN);
memcpy(mgmt.bssid, hapd->conf->assoc_ap_addr, ETH_ALEN);
mgmt.u.auth.auth_alg = host_to_le16(WLAN_AUTH_OPEN);
mgmt.u.auth.auth_transaction = host_to_le16(1);
mgmt.u.auth.status_code = host_to_le16(0);
if (hostapd_send_mgmt_frame(hapd, &mgmt, IEEE80211_HDRLEN +
sizeof(mgmt.u.auth), 0) < 0)
perror("ieee802_11_sta_authenticate: send");
/* Try to authenticate again, if this attempt fails or times out. */
eloop_register_timeout(5, 0, ieee802_11_sta_authenticate, hapd, NULL);
}
static void ieee802_11_sta_associate(void *eloop_ctx, void *timeout_ctx)
{
hostapd *hapd = eloop_ctx;
u8 buf[256];
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) buf;
u8 *p;
if (hapd->assoc_ap_state == AUTHENTICATE)
hapd->assoc_ap_state = ASSOCIATE;
if (hapd->assoc_ap_state != ASSOCIATE)
return;
printf("Associate with AP " MACSTR " SSID=",
MAC2STR(hapd->conf->assoc_ap_addr));
ieee802_11_print_ssid((u8 *) hapd->assoc_ap_ssid,
hapd->assoc_ap_ssid_len);
printf(" (as station)\n");
memset(mgmt, 0, sizeof(*mgmt));
mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
WLAN_FC_STYPE_ASSOC_REQ);
/* Request TX callback */
mgmt->frame_control |= host_to_le16(BIT(1));
memcpy(mgmt->da, hapd->conf->assoc_ap_addr, ETH_ALEN);
memcpy(mgmt->sa, hapd->own_addr, ETH_ALEN);
memcpy(mgmt->bssid, hapd->conf->assoc_ap_addr, ETH_ALEN);
mgmt->u.assoc_req.capab_info = host_to_le16(0);
mgmt->u.assoc_req.listen_interval = host_to_le16(1);
p = &mgmt->u.assoc_req.variable[0];
*p++ = WLAN_EID_SSID;
*p++ = hapd->assoc_ap_ssid_len;
memcpy(p, hapd->assoc_ap_ssid, hapd->assoc_ap_ssid_len);
p += hapd->assoc_ap_ssid_len;
p = hostapd_eid_supp_rates(hapd, p);
if (hostapd_send_mgmt_frame(hapd, mgmt, p - (u8 *) mgmt, 0) < 0)
perror("ieee802_11_sta_associate: send");
/* Try to authenticate again, if this attempt fails or times out. */
eloop_register_timeout(5, 0, ieee802_11_sta_associate, hapd, NULL);
}
static u16 auth_shared_key(hostapd *hapd, struct sta_info *sta,
u16 auth_transaction, u8 *challenge, int iswep)
{
hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_DEBUG,
"authentication (shared key, transaction %d)",
auth_transaction);
if (auth_transaction == 1) {
if (!sta->challenge) {
/* Generate a pseudo-random challenge */
u8 key[8];
time_t now;
int r;
sta->challenge = malloc(WLAN_AUTH_CHALLENGE_LEN);
if (!sta->challenge)
return WLAN_STATUS_UNSPECIFIED_FAILURE;
memset(sta->challenge, 0, WLAN_AUTH_CHALLENGE_LEN);
now = time(NULL);
r = random();
memcpy(key, &now, 4);
memcpy(key + 4, &r, 4);
rc4(sta->challenge, WLAN_AUTH_CHALLENGE_LEN,
key, sizeof(key));
}
return 0;
}
if (auth_transaction != 3)
return WLAN_STATUS_UNSPECIFIED_FAILURE;
/* Transaction 3 */
if (!iswep || !sta->challenge || !challenge ||
memcmp(sta->challenge, challenge, WLAN_AUTH_CHALLENGE_LEN)) {
hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_INFO,
"shared key authentication - invalid "
"challenge-response");
return WLAN_STATUS_CHALLENGE_FAIL;
}
hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_DEBUG,
"authentication OK (shared key)");
#ifdef IEEE80211_REQUIRE_AUTH_ACK
/* Station will be marked authenticated if it ACKs the
* authentication reply. */
#else
sta->flags |= WLAN_STA_AUTH;
wpa_sm_event(hapd, sta, WPA_AUTH);
#endif
free(sta->challenge);
sta->challenge = NULL;
return 0;
}
static void send_auth_reply(hostapd *hapd, struct ieee80211_mgmt *mgmt,
u16 auth_alg, u16 auth_transaction, u16 resp,
u8 *challenge)
{
u8 buf[IEEE80211_HDRLEN + sizeof(mgmt->u.auth) + 2 +
WLAN_AUTH_CHALLENGE_LEN];
struct ieee80211_mgmt *reply;
size_t rlen;
memset(buf, 0, sizeof(buf));
reply = (struct ieee80211_mgmt *) buf;
reply->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
WLAN_FC_STYPE_AUTH);
/* Request TX callback */
reply->frame_control |= host_to_le16(BIT(1));
memcpy(reply->da, mgmt->sa, ETH_ALEN);
memcpy(reply->sa, hapd->own_addr, ETH_ALEN);
memcpy(reply->bssid, mgmt->bssid, ETH_ALEN);
reply->u.auth.auth_alg = host_to_le16(auth_alg);
reply->u.auth.auth_transaction = host_to_le16(auth_transaction);
reply->u.auth.status_code = host_to_le16(resp);
rlen = IEEE80211_HDRLEN + sizeof(reply->u.auth);
if (auth_alg == WLAN_AUTH_SHARED_KEY && auth_transaction == 2 &&
challenge) {
u8 *p = reply->u.auth.variable;
*p++ = WLAN_EID_CHALLENGE;
*p++ = WLAN_AUTH_CHALLENGE_LEN;
memcpy(p, challenge, WLAN_AUTH_CHALLENGE_LEN);
rlen += 2 + WLAN_AUTH_CHALLENGE_LEN;
} else
challenge = NULL;
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
"authentication reply: STA=" MACSTR " auth_alg=%d "
"auth_transaction=%d resp=%d%s\n",
MAC2STR(mgmt->sa), auth_alg, auth_transaction,
resp, challenge ? " challenge" : "");
if (hostapd_send_mgmt_frame(hapd, reply, rlen, 0) < 0)
perror("send_auth_reply: send");
}
static void handle_auth(hostapd *hapd, struct ieee80211_mgmt *mgmt, size_t len)
{
u16 auth_alg, auth_transaction, status_code;
u16 resp = WLAN_STATUS_SUCCESS;
struct sta_info *sta = NULL;
int res;
u16 fc;
u8 *challenge = NULL;
u32 session_timeout, acct_interim_interval;
if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.auth)) {
printf("handle_auth - too short payload (len=%lu)\n",
(unsigned long) len);
return;
}
auth_alg = le_to_host16(mgmt->u.auth.auth_alg);
auth_transaction = le_to_host16(mgmt->u.auth.auth_transaction);
status_code = le_to_host16(mgmt->u.auth.status_code);
fc = le_to_host16(mgmt->frame_control);
if (len >= IEEE80211_HDRLEN + sizeof(mgmt->u.auth) +
2 + WLAN_AUTH_CHALLENGE_LEN &&
mgmt->u.auth.variable[0] == WLAN_EID_CHALLENGE &&
mgmt->u.auth.variable[1] == WLAN_AUTH_CHALLENGE_LEN)
challenge = &mgmt->u.auth.variable[2];
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
"authentication: STA=" MACSTR " auth_alg=%d "
"auth_transaction=%d status_code=%d wep=%d%s\n",
MAC2STR(mgmt->sa), auth_alg, auth_transaction,
status_code, !!(fc & WLAN_FC_ISWEP),
challenge ? " challenge" : "");
if (hapd->assoc_ap_state == AUTHENTICATE && auth_transaction == 2 &&
memcmp(mgmt->sa, hapd->conf->assoc_ap_addr, ETH_ALEN) == 0 &&
memcmp(mgmt->bssid, hapd->conf->assoc_ap_addr, ETH_ALEN) == 0) {
if (status_code != 0) {
printf("Authentication (as station) with AP "
MACSTR " failed (status_code=%d)\n",
MAC2STR(hapd->conf->assoc_ap_addr),
status_code);
return;
}
printf("Authenticated (as station) with AP " MACSTR "\n",
MAC2STR(hapd->conf->assoc_ap_addr));
ieee802_11_sta_associate(hapd, NULL);
return;
}
if (hapd->tkip_countermeasures) {
resp = WLAN_REASON_MICHAEL_MIC_FAILURE;
goto fail;
}
if (!(((hapd->conf->auth_algs & HOSTAPD_AUTH_OPEN) &&
auth_alg == WLAN_AUTH_OPEN) ||
((hapd->conf->auth_algs & HOSTAPD_AUTH_SHARED_KEY) &&
auth_alg == WLAN_AUTH_SHARED_KEY))) {
printf("Unsupported authentication algorithm (%d)\n",
auth_alg);
resp = WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG;
goto fail;
}
if (!(auth_transaction == 1 ||
(auth_alg == WLAN_AUTH_SHARED_KEY && auth_transaction == 3))) {
printf("Unknown authentication transaction number (%d)\n",
auth_transaction);
resp = WLAN_STATUS_UNKNOWN_AUTH_TRANSACTION;
goto fail;
}
if (memcmp(mgmt->sa, hapd->own_addr, ETH_ALEN) == 0) {
printf("Station " MACSTR " not allowed to authenticate.\n",
MAC2STR(mgmt->sa));
resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
goto fail;
}
res = hostapd_allowed_address(hapd, mgmt->sa, (u8 *) mgmt, len,
&session_timeout,
&acct_interim_interval);
if (res == HOSTAPD_ACL_REJECT) {
printf("Station " MACSTR " not allowed to authenticate.\n",
MAC2STR(mgmt->sa));
resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
goto fail;
}
if (res == HOSTAPD_ACL_PENDING) {
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "Authentication frame "
"from " MACSTR " waiting for an external "
"authentication\n", MAC2STR(mgmt->sa));
/* Authentication code will re-send the authentication frame
* after it has received (and cached) information from the
* external source. */
return;
}
sta = ap_sta_add(hapd, mgmt->sa);
if (!sta) {
resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
goto fail;
}
sta->flags &= ~WLAN_STA_PREAUTH;
ieee802_1x_notify_pre_auth(sta->eapol_sm, 0);
if (hapd->conf->radius->acct_interim_interval == 0 &&
acct_interim_interval)
sta->acct_interim_interval = acct_interim_interval;
if (res == HOSTAPD_ACL_ACCEPT_TIMEOUT)
ap_sta_session_timeout(hapd, sta, session_timeout);
else
ap_sta_no_session_timeout(hapd, sta);
switch (auth_alg) {
case WLAN_AUTH_OPEN:
hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_DEBUG,
"authentication OK (open system)");
#ifdef IEEE80211_REQUIRE_AUTH_ACK
/* Station will be marked authenticated if it ACKs the
* authentication reply. */
#else
sta->flags |= WLAN_STA_AUTH;
wpa_sm_event(hapd, sta, WPA_AUTH);
#endif
break;
case WLAN_AUTH_SHARED_KEY:
resp = auth_shared_key(hapd, sta, auth_transaction, challenge,
fc & WLAN_FC_ISWEP);
break;
}
fail:
send_auth_reply(hapd, mgmt, auth_alg, auth_transaction + 1, resp,
sta ? sta->challenge : NULL);
}
static void handle_assoc(hostapd *hapd, struct ieee80211_mgmt *mgmt,
size_t len, int reassoc)
{
u16 capab_info, listen_interval;
u16 resp = WLAN_STATUS_SUCCESS;
u8 *pos, *wpa_ie;
size_t wpa_ie_len;
int send_deauth = 0, send_len, left, i;
struct sta_info *sta;
struct ieee802_11_elems elems;
if (len < IEEE80211_HDRLEN + (reassoc ? sizeof(mgmt->u.reassoc_req) :
sizeof(mgmt->u.assoc_req))) {
printf("handle_assoc(reassoc=%d) - too short payload (len=%lu)"
"\n", reassoc, (unsigned long) len);
return;
}
if (reassoc) {
capab_info = le_to_host16(mgmt->u.reassoc_req.capab_info);
listen_interval = le_to_host16(
mgmt->u.reassoc_req.listen_interval);
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
"reassociation request: STA=" MACSTR
" capab_info=0x%02x "
"listen_interval=%d current_ap=" MACSTR "\n",
MAC2STR(mgmt->sa), capab_info, listen_interval,
MAC2STR(mgmt->u.reassoc_req.current_ap));
left = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.reassoc_req));
pos = mgmt->u.reassoc_req.variable;
} else {
capab_info = le_to_host16(mgmt->u.assoc_req.capab_info);
listen_interval = le_to_host16(
mgmt->u.assoc_req.listen_interval);
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
"association request: STA=" MACSTR
" capab_info=0x%02x listen_interval=%d\n",
MAC2STR(mgmt->sa), capab_info, listen_interval);
left = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.assoc_req));
pos = mgmt->u.assoc_req.variable;
}
sta = ap_get_sta(hapd, mgmt->sa);
if (sta == NULL || (sta->flags & WLAN_STA_AUTH) == 0) {
printf("STA " MACSTR " trying to associate before "
"authentication\n", MAC2STR(mgmt->sa));
if (sta) {
printf(" sta: addr=" MACSTR " aid=%d flags=0x%04x\n",
MAC2STR(sta->addr), sta->aid, sta->flags);
}
send_deauth = 1;
resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
goto fail;
}
if (hapd->tkip_countermeasures) {
resp = WLAN_REASON_MICHAEL_MIC_FAILURE;
goto fail;
}
sta->capability = capab_info;
/* followed by SSID and Supported rates */
if (ieee802_11_parse_elems(hapd, pos, left, &elems, 1) == ParseFailed
|| !elems.ssid) {
printf("STA " MACSTR " sent invalid association request\n",
MAC2STR(sta->addr));
resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
goto fail;
}
if (elems.ssid_len != hapd->conf->ssid_len ||
memcmp(elems.ssid, hapd->conf->ssid, elems.ssid_len) != 0) {
printf("Station " MACSTR " tried to associate with "
"unknown SSID '", MAC2STR(sta->addr));
ieee802_11_print_ssid(elems.ssid, elems.ssid_len);
printf("'\n");
resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
goto fail;
}
if (elems.supp_rates) {
if (elems.supp_rates_len > sizeof(sta->supported_rates)) {
printf("STA " MACSTR ": Invalid supported rates "
"element length %d\n", MAC2STR(sta->addr),
elems.supp_rates_len);
resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
goto fail;
}
memset(sta->supported_rates, 0, sizeof(sta->supported_rates));
memcpy(sta->supported_rates, elems.supp_rates,
elems.supp_rates_len);
sta->tx_supp_rates = 0;
for (i = 0; i < elems.supp_rates_len; i++) {
if ((sta->supported_rates[i] & 0x7f) == 2)
sta->tx_supp_rates |= WLAN_RATE_1M;
if ((sta->supported_rates[i] & 0x7f) == 4)
sta->tx_supp_rates |= WLAN_RATE_2M;
if ((sta->supported_rates[i] & 0x7f) == 11)
sta->tx_supp_rates |= WLAN_RATE_5M5;
if ((sta->supported_rates[i] & 0x7f) == 22)
sta->tx_supp_rates |= WLAN_RATE_11M;
}
} else
sta->tx_supp_rates = 0xff;
if ((hapd->conf->wpa & HOSTAPD_WPA_VERSION_WPA2) && elems.rsn_ie) {
wpa_ie = elems.rsn_ie;
wpa_ie_len = elems.rsn_ie_len;
} else if ((hapd->conf->wpa & HOSTAPD_WPA_VERSION_WPA) &&
elems.wpa_ie) {
wpa_ie = elems.wpa_ie;
wpa_ie_len = elems.wpa_ie_len;
} else {
wpa_ie = NULL;
wpa_ie_len = 0;
}
if (hapd->conf->wpa && wpa_ie == NULL) {
printf("STA " MACSTR ": No WPA/RSN IE in association "
"request\n", MAC2STR(sta->addr));
resp = WLAN_STATUS_INVALID_IE;
goto fail;
}
if (hapd->conf->wpa) {
int res;
wpa_ie -= 2;
wpa_ie_len += 2;
res = wpa_validate_wpa_ie(hapd, sta, wpa_ie, wpa_ie_len,
elems.rsn_ie ?
HOSTAPD_WPA_VERSION_WPA2 :
HOSTAPD_WPA_VERSION_WPA);
if (res == WPA_INVALID_GROUP)
resp = WLAN_STATUS_GROUP_CIPHER_NOT_VALID;
else if (res == WPA_INVALID_PAIRWISE)
resp = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID;
else if (res == WPA_INVALID_AKMP)
resp = WLAN_STATUS_AKMP_NOT_VALID;
else if (res != WPA_IE_OK)
resp = WLAN_STATUS_INVALID_IE;
if (resp != WLAN_STATUS_SUCCESS)
goto fail;
free(sta->wpa_ie);
sta->wpa_ie = malloc(wpa_ie_len);
if (sta->wpa_ie == NULL) {
resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
goto fail;
}
sta->wpa_ie_len = wpa_ie_len;
memcpy(sta->wpa_ie, wpa_ie, wpa_ie_len);
}
/* get a unique AID */
if (sta->aid > 0) {
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
" old AID %d\n", sta->aid);
} else {
for (sta->aid = 1; sta->aid <= MAX_AID_TABLE_SIZE; sta->aid++)
if (hapd->sta_aid[sta->aid - 1] == NULL)
break;
if (sta->aid > MAX_AID_TABLE_SIZE) {
sta->aid = 0;
resp = WLAN_STATUS_AP_UNABLE_TO_HANDLE_NEW_STA;
printf(" no room for more AIDs\n");
goto fail;
} else {
hapd->sta_aid[sta->aid - 1] = sta;
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
" new AID %d\n", sta->aid);
}
}
hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_DEBUG,
"association OK (aid %d)", sta->aid);
/* Station will be marked associated, after it acknowledges AssocResp
*/
if (sta->last_assoc_req)
free(sta->last_assoc_req);
sta->last_assoc_req = (struct ieee80211_mgmt *) malloc(len);
if (sta->last_assoc_req)
memcpy(sta->last_assoc_req, mgmt, len);
/* Make sure that the previously registered inactivity timer will not
* remove the STA immediately. */
sta->timeout_next = STA_NULLFUNC;
fail:
/* use the queued buffer for transmission because it is large enough
* and not needed anymore */
mgmt->frame_control =
IEEE80211_FC(WLAN_FC_TYPE_MGMT,
(send_deauth ? WLAN_FC_STYPE_DEAUTH :
(reassoc ? WLAN_FC_STYPE_REASSOC_RESP :
WLAN_FC_STYPE_ASSOC_RESP)));
memcpy(mgmt->da, mgmt->sa, ETH_ALEN);
memcpy(mgmt->sa, hapd->own_addr, ETH_ALEN);
/* Addr3 = BSSID - already set */
send_len = IEEE80211_HDRLEN;
if (send_deauth) {
send_len += sizeof(mgmt->u.deauth);
mgmt->u.deauth.reason_code = host_to_le16(resp);
} else {
u8 *p;
send_len += sizeof(mgmt->u.assoc_resp);
mgmt->u.assoc_resp.capab_info =
host_to_le16(hostapd_own_capab_info(hapd));
mgmt->u.assoc_resp.status_code = host_to_le16(resp);
mgmt->u.assoc_resp.aid = host_to_le16((sta ? sta->aid : 0)
| BIT(14) | BIT(15));
/* Supported rates */
p = hostapd_eid_supp_rates(hapd, mgmt->u.assoc_resp.variable);
send_len += p - mgmt->u.assoc_resp.variable;
/* Request TX callback */
mgmt->frame_control |= host_to_le16(BIT(1));
}
if (hostapd_send_mgmt_frame(hapd, mgmt, send_len, 0) < 0)
perror("handle_assoc: send");
}
static void handle_assoc_resp(hostapd *hapd, struct ieee80211_mgmt *mgmt,
size_t len)
{
u16 status_code, aid;
if (hapd->assoc_ap_state != ASSOCIATE) {
printf("Unexpected association response received from " MACSTR
"\n", MAC2STR(mgmt->sa));
return;
}
if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.assoc_resp)) {
printf("handle_assoc_resp - too short payload (len=%lu)\n",
(unsigned long) len);
return;
}
if (memcmp(mgmt->sa, hapd->conf->assoc_ap_addr, ETH_ALEN) != 0 ||
memcmp(mgmt->bssid, hapd->conf->assoc_ap_addr, ETH_ALEN) != 0) {
printf("Received association response from unexpected address "
"(SA=" MACSTR " BSSID=" MACSTR "\n",
MAC2STR(mgmt->sa), MAC2STR(mgmt->bssid));
return;
}
status_code = le_to_host16(mgmt->u.assoc_resp.status_code);
aid = le_to_host16(mgmt->u.assoc_resp.aid);
aid &= ~(BIT(14) | BIT(15));
if (status_code != 0) {
printf("Association (as station) with AP " MACSTR " failed "
"(status_code=%d)\n",
MAC2STR(hapd->conf->assoc_ap_addr), status_code);
/* Try to authenticate again */
hapd->assoc_ap_state = AUTHENTICATE;
eloop_register_timeout(5, 0, ieee802_11_sta_authenticate,
hapd, NULL);
}
printf("Associated (as station) with AP " MACSTR " (aid=%d)\n",
MAC2STR(hapd->conf->assoc_ap_addr), aid);
hapd->assoc_ap_aid = aid;
hapd->assoc_ap_state = ASSOCIATED;
if (hostapd_set_assoc_ap(hapd, hapd->conf->assoc_ap_addr)) {
printf("Could not set associated AP address to kernel "
"driver.\n");
}
}
static void handle_disassoc(hostapd *hapd, struct ieee80211_mgmt *mgmt,
size_t len)
{
struct sta_info *sta;
if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.disassoc)) {
printf("handle_disassoc - too short payload (len=%lu)\n",
(unsigned long) len);
return;
}
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
"disassocation: STA=" MACSTR " reason_code=%d\n",
MAC2STR(mgmt->sa),
le_to_host16(mgmt->u.disassoc.reason_code));
if (hapd->assoc_ap_state != DO_NOT_ASSOC &&
memcmp(mgmt->sa, hapd->conf->assoc_ap_addr, ETH_ALEN) == 0) {
printf("Assoc AP " MACSTR " sent disassociation "
"(reason_code=%d) - try to authenticate\n",
MAC2STR(hapd->conf->assoc_ap_addr),
le_to_host16(mgmt->u.disassoc.reason_code));
hapd->assoc_ap_state = AUTHENTICATE;
ieee802_11_sta_authenticate(hapd, NULL);
eloop_register_timeout(0, 500000, ieee802_11_sta_authenticate,
hapd, NULL);
return;
}
sta = ap_get_sta(hapd, mgmt->sa);
if (sta == NULL) {
printf("Station " MACSTR " trying to disassociate, but it "
"is not associated.\n", MAC2STR(mgmt->sa));
return;
}
sta->flags &= ~WLAN_STA_ASSOC;
wpa_sm_event(hapd, sta, WPA_DISASSOC);
hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_INFO, "disassociated");
sta->acct_terminate_cause = RADIUS_ACCT_TERMINATE_CAUSE_USER_REQUEST;
ieee802_1x_set_port_enabled(hapd, sta, 0);
/* Stop Accounting and IEEE 802.1X sessions, but leave the STA
* authenticated. */
accounting_sta_stop(hapd, sta);
ieee802_1x_free_station(sta);
hostapd_sta_remove(hapd, sta->addr);
if (sta->timeout_next == STA_NULLFUNC ||
sta->timeout_next == STA_DISASSOC) {
sta->timeout_next = STA_DEAUTH;
eloop_cancel_timeout(ap_handle_timer, hapd, sta);
eloop_register_timeout(AP_DEAUTH_DELAY, 0, ap_handle_timer,
hapd, sta);
}
}
static void handle_deauth(hostapd *hapd, struct ieee80211_mgmt *mgmt,
size_t len)
{
struct sta_info *sta;
if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.deauth)) {
printf("handle_deauth - too short payload (len=%lu)\n",
(unsigned long) len);
return;
}
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
"deauthentication: STA=" MACSTR " reason_code=%d\n",
MAC2STR(mgmt->sa),
le_to_host16(mgmt->u.deauth.reason_code));
if (hapd->assoc_ap_state != DO_NOT_ASSOC &&
memcmp(mgmt->sa, hapd->conf->assoc_ap_addr, ETH_ALEN) == 0) {
printf("Assoc AP " MACSTR " sent deauthentication "
"(reason_code=%d) - try to authenticate\n",
MAC2STR(hapd->conf->assoc_ap_addr),
le_to_host16(mgmt->u.deauth.reason_code));
hapd->assoc_ap_state = AUTHENTICATE;
eloop_register_timeout(0, 500000, ieee802_11_sta_authenticate,
hapd, NULL);
return;
}
sta = ap_get_sta(hapd, mgmt->sa);
if (sta == NULL) {
printf("Station " MACSTR " trying to deauthenticate, but it "
"is not authenticated.\n", MAC2STR(mgmt->sa));
return;
}
sta->flags &= ~(WLAN_STA_AUTH | WLAN_STA_ASSOC);
wpa_sm_event(hapd, sta, WPA_DEAUTH);
hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_DEBUG, "deauthenticated");
sta->acct_terminate_cause = RADIUS_ACCT_TERMINATE_CAUSE_USER_REQUEST;
ieee802_1x_set_port_enabled(hapd, sta, 0);
ap_free_sta(hapd, sta);
}
static void handle_beacon(hostapd *hapd, struct ieee80211_mgmt *mgmt,
size_t len)
{
struct ieee802_11_elems elems;
if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.beacon)) {
printf("handle_beacon - too short payload (len=%lu)\n",
(unsigned long) len);
return;
}
(void) ieee802_11_parse_elems(hapd, mgmt->u.beacon.variable,
len - (IEEE80211_HDRLEN +
sizeof(mgmt->u.beacon)), &elems,
0);
if (hapd->assoc_ap_state == WAIT_BEACON &&
memcmp(mgmt->sa, hapd->conf->assoc_ap_addr, ETH_ALEN) == 0) {
if (elems.ssid && elems.ssid_len <= 32) {
memcpy(hapd->assoc_ap_ssid, elems.ssid,
elems.ssid_len);
hapd->assoc_ap_ssid[elems.ssid_len] = '\0';
hapd->assoc_ap_ssid_len = elems.ssid_len;
}
ieee802_11_sta_authenticate(hapd, NULL);
}
if (!HOSTAPD_DEBUG_COND(HOSTAPD_DEBUG_EXCESSIVE))
return;
printf("Beacon from " MACSTR, MAC2STR(mgmt->sa));
if (elems.ssid) {
printf(" SSID='");
ieee802_11_print_ssid(elems.ssid, elems.ssid_len);
printf("'");
}
if (elems.ds_params && elems.ds_params_len == 1)
printf(" CHAN=%d", elems.ds_params[0]);
printf("\n");
}
void ieee802_11_mgmt(struct hostapd_data *hapd, u8 *buf, size_t len, u16 stype)
{
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) buf;
if (stype == WLAN_FC_STYPE_BEACON) {
HOSTAPD_DEBUG(HOSTAPD_DEBUG_EXCESSIVE, "mgmt::beacon\n");
handle_beacon(hapd, mgmt, len);
return;
}
if (memcmp(mgmt->bssid, hapd->own_addr, ETH_ALEN) != 0 &&
(hapd->assoc_ap_state == DO_NOT_ASSOC ||
memcmp(mgmt->bssid, hapd->conf->assoc_ap_addr, ETH_ALEN) != 0)) {
printf("MGMT: BSSID=" MACSTR " not our address\n",
MAC2STR(mgmt->bssid));
return;
}
if (stype == WLAN_FC_STYPE_PROBE_REQ) {
printf("mgmt::probe_req\n");
return;
}
if (memcmp(mgmt->da, hapd->own_addr, ETH_ALEN) != 0) {
printf("MGMT: DA=" MACSTR " not our address\n",
MAC2STR(mgmt->da));
return;
}
switch (stype) {
case WLAN_FC_STYPE_AUTH:
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "mgmt::auth\n");
handle_auth(hapd, mgmt, len);
break;
case WLAN_FC_STYPE_ASSOC_REQ:
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "mgmt::assoc_req\n");
handle_assoc(hapd, mgmt, len, 0);
break;
case WLAN_FC_STYPE_ASSOC_RESP:
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "mgmt::assoc_resp\n");
handle_assoc_resp(hapd, mgmt, len);
break;
case WLAN_FC_STYPE_REASSOC_REQ:
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "mgmt::reassoc_req\n");
handle_assoc(hapd, mgmt, len, 1);
break;
case WLAN_FC_STYPE_DISASSOC:
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "mgmt::disassoc\n");
handle_disassoc(hapd, mgmt, len);
break;
case WLAN_FC_STYPE_DEAUTH:
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "mgmt::deauth\n");
handle_deauth(hapd, mgmt, len);
break;
default:
printf("unknown mgmt frame subtype %d\n", stype);
break;
}
}
static void handle_auth_cb(hostapd *hapd, struct ieee80211_mgmt *mgmt,
size_t len, int ok)
{
u16 auth_alg, auth_transaction, status_code;
struct sta_info *sta;
if (!ok) {
hostapd_logger(hapd, mgmt->da, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_NOTICE,
"did not acknowledge authentication response");
return;
}
if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.auth)) {
printf("handle_auth_cb - too short payload (len=%lu)\n",
(unsigned long) len);
return;
}
auth_alg = le_to_host16(mgmt->u.auth.auth_alg);
auth_transaction = le_to_host16(mgmt->u.auth.auth_transaction);
status_code = le_to_host16(mgmt->u.auth.status_code);
sta = ap_get_sta(hapd, mgmt->da);
if (!sta) {
printf("handle_auth_cb: STA " MACSTR " not found\n",
MAC2STR(mgmt->da));
return;
}
if (status_code == WLAN_STATUS_SUCCESS &&
((auth_alg == WLAN_AUTH_OPEN && auth_transaction == 2) ||
(auth_alg == WLAN_AUTH_SHARED_KEY && auth_transaction == 4))) {
hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_INFO, "authenticated");
sta->flags |= WLAN_STA_AUTH;
}
}
static void handle_assoc_cb(hostapd *hapd, struct ieee80211_mgmt *mgmt,
size_t len, int reassoc, int ok)
{
u16 status;
struct sta_info *sta;
int new_assoc = 1;
if (!ok) {
hostapd_logger(hapd, mgmt->da, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_DEBUG,
"did not acknowledge association response");
return;
}
if (len < IEEE80211_HDRLEN + (reassoc ? sizeof(mgmt->u.reassoc_req) :
sizeof(mgmt->u.assoc_req))) {
printf("handle_assoc_cb(reassoc=%d) - too short payload "
"(len=%lu)\n", reassoc, (unsigned long) len);
return;
}
if (reassoc)
status = le_to_host16(mgmt->u.reassoc_resp.status_code);
else
status = le_to_host16(mgmt->u.assoc_resp.status_code);
sta = ap_get_sta(hapd, mgmt->da);
if (!sta) {
printf("handle_assoc_cb: STA " MACSTR " not found\n",
MAC2STR(mgmt->da));
return;
}
if (status != WLAN_STATUS_SUCCESS)
goto fail;
/* Stop previous accounting session, if one is started, and allocate
* new session id for the new session. */
accounting_sta_stop(hapd, sta);
accounting_sta_get_id(hapd, sta);
hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_INFO,
"associated (aid %d, accounting session %08X-%08X)",
sta->aid, sta->acct_session_id_hi,
sta->acct_session_id_lo);
if (sta->flags & WLAN_STA_ASSOC)
new_assoc = 0;
sta->flags |= WLAN_STA_ASSOC;
if (hostapd_sta_add(hapd, sta->addr, sta->aid, sta->capability,
sta->tx_supp_rates)) {
printf("Could not add station to kernel driver.\n");
}
wpa_sm_event(hapd, sta, WPA_ASSOC);
hostapd_new_assoc_sta(hapd, sta, !new_assoc);
ieee802_1x_notify_port_enabled(sta->eapol_sm, 1);
fail:
/* Copy of the association request is not needed anymore */
if (sta->last_assoc_req) {
free(sta->last_assoc_req);
sta->last_assoc_req = NULL;
}
}
void ieee802_11_mgmt_cb(struct hostapd_data *hapd, u8 *buf, size_t len,
u16 stype, int ok)
{
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) buf;
switch (stype) {
case WLAN_FC_STYPE_AUTH:
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "mgmt::auth cb\n");
handle_auth_cb(hapd, mgmt, len, ok);
break;
case WLAN_FC_STYPE_ASSOC_RESP:
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
"mgmt::assoc_resp cb\n");
handle_assoc_cb(hapd, mgmt, len, 0, ok);
break;
case WLAN_FC_STYPE_REASSOC_RESP:
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
"mgmt::reassoc_resp cb\n");
handle_assoc_cb(hapd, mgmt, len, 1, ok);
break;
default:
printf("unknown mgmt cb frame subtype %d\n", stype);
break;
}
}
static void ieee80211_tkip_countermeasures_stop(void *eloop_ctx,
void *timeout_ctx)
{
struct hostapd_data *hapd = eloop_ctx;
hapd->tkip_countermeasures = 0;
hostapd_set_countermeasures(hapd, 0);
hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_INFO, "TKIP countermeasures ended");
}
static void ieee80211_tkip_countermeasures_start(struct hostapd_data *hapd)
{
struct sta_info *sta;
hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_INFO, "TKIP countermeasures initiated");
if (hapd->wpa_auth)
hapd->wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++;
hapd->tkip_countermeasures = 1;
hostapd_set_countermeasures(hapd, 1);
wpa_gtk_rekey(hapd);
eloop_cancel_timeout(ieee80211_tkip_countermeasures_stop, hapd, NULL);
eloop_register_timeout(60, 0, ieee80211_tkip_countermeasures_stop,
hapd, NULL);
for (sta = hapd->sta_list; sta != NULL; sta = sta->next) {
hostapd_sta_deauth(hapd, sta->addr,
WLAN_REASON_MICHAEL_MIC_FAILURE);
sta->flags &= ~(WLAN_STA_AUTH | WLAN_STA_ASSOC |
WLAN_STA_AUTHORIZED);
hostapd_sta_remove(hapd, sta->addr);
}
}
void ieee80211_michael_mic_failure(struct hostapd_data *hapd, u8 *addr,
int local)
{
time_t now;
if (addr && local) {
struct sta_info *sta = ap_get_sta(hapd, addr);
if (sta != NULL) {
sta->dot11RSNAStatsTKIPLocalMICFailures++;
hostapd_logger(hapd, addr, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_INFO,
"Michael MIC failure detected in "
"received frame");
} else {
HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
"MLME-MICHAELMICFAILURE.indication "
"for not associated STA (" MACSTR
") ignored\n", MAC2STR(addr));
return;
}
}
time(&now);
if (now > hapd->michael_mic_failure + 60) {
hapd->michael_mic_failures = 1;
} else {
hapd->michael_mic_failures++;
if (hapd->michael_mic_failures > 1)
ieee80211_tkip_countermeasures_start(hapd);
}
hapd->michael_mic_failure = now;
}
int ieee802_11_get_mib(struct hostapd_data *hapd, char *buf, size_t buflen)
{
/* TODO */
return 0;
}
int ieee802_11_get_mib_sta(struct hostapd_data *hapd, struct sta_info *sta,
char *buf, size_t buflen)
{
/* TODO */
return 0;
}
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