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hostap/wlantest/rx_mgmt.c
Jouni Malinen faf6894f35 wlantest: BIGTK fetching and Beacon protection validation 
Fetch the BIGTK from EAPOL-Key msg 3/4 and use it to validate MME in
Beacon frames when the AP uses Beacon protection.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
2020-02-21 19:41:36 +02:00

1836 lines
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/*
* Received Management frame processing
* Copyright (c) 2010-2015, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "utils/includes.h"
#include "utils/common.h"
#include "common/defs.h"
#include "common/ieee802_11_defs.h"
#include "common/ieee802_11_common.h"
#include "common/wpa_common.h"
#include "crypto/aes.h"
#include "crypto/aes_siv.h"
#include "crypto/aes_wrap.h"
#include "wlantest.h"
static int check_mmie_mic(unsigned int mgmt_group_cipher,
const u8 *igtk, size_t igtk_len,
const u8 *data, size_t len);
static const char * mgmt_stype(u16 stype)
{
switch (stype) {
case WLAN_FC_STYPE_ASSOC_REQ:
return "ASSOC-REQ";
case WLAN_FC_STYPE_ASSOC_RESP:
return "ASSOC-RESP";
case WLAN_FC_STYPE_REASSOC_REQ:
return "REASSOC-REQ";
case WLAN_FC_STYPE_REASSOC_RESP:
return "REASSOC-RESP";
case WLAN_FC_STYPE_PROBE_REQ:
return "PROBE-REQ";
case WLAN_FC_STYPE_PROBE_RESP:
return "PROBE-RESP";
case WLAN_FC_STYPE_BEACON:
return "BEACON";
case WLAN_FC_STYPE_ATIM:
return "ATIM";
case WLAN_FC_STYPE_DISASSOC:
return "DISASSOC";
case WLAN_FC_STYPE_AUTH:
return "AUTH";
case WLAN_FC_STYPE_DEAUTH:
return "DEAUTH";
case WLAN_FC_STYPE_ACTION:
return "ACTION";
}
return "??";
}
static void rx_mgmt_beacon(struct wlantest *wt, const u8 *data, size_t len)
{
const struct ieee80211_mgmt *mgmt;
struct wlantest_bss *bss;
struct ieee802_11_elems elems;
size_t offset;
const u8 *mme;
size_t mic_len;
u16 keyid;
mgmt = (const struct ieee80211_mgmt *) data;
offset = mgmt->u.beacon.variable - data;
if (len < offset)
return;
bss = bss_get(wt, mgmt->bssid);
if (bss == NULL)
return;
if (bss->proberesp_seen)
return; /* do not override with Beacon data */
bss->capab_info = le_to_host16(mgmt->u.beacon.capab_info);
if (ieee802_11_parse_elems(mgmt->u.beacon.variable, len - offset,
&elems, 0) == ParseFailed) {
if (bss->parse_error_reported)
return;
add_note(wt, MSG_INFO, "Invalid IEs in a Beacon frame from "
MACSTR, MAC2STR(mgmt->sa));
bss->parse_error_reported = 1;
return;
}
bss_update(wt, bss, &elems);
mme = get_ie(mgmt->u.beacon.variable, len - offset, WLAN_EID_MMIE);
if (!mme) {
if (bss->bigtk_idx) {
add_note(wt, MSG_INFO,
"Unexpected unprotected Beacon frame from "
MACSTR, MAC2STR(mgmt->sa));
bss->counters[WLANTEST_BSS_COUNTER_MISSING_BIP_MMIE]++;
}
return;
}
mic_len = bss->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC ? 8 : 16;
if (len < 24 + 10 + mic_len ||
data[len - (10 + mic_len)] != WLAN_EID_MMIE ||
data[len - (10 + mic_len - 1)] != 8 + mic_len) {
add_note(wt, MSG_INFO, "Invalid MME in a Beacon frame from "
MACSTR, MAC2STR(mgmt->sa));
return;
}
mme += 2;
keyid = WPA_GET_LE16(mme);
if (keyid < 6 || keyid > 7) {
add_note(wt, MSG_INFO, "Unexpected MME KeyID %u from " MACSTR,
keyid, MAC2STR(mgmt->sa));
bss->counters[WLANTEST_BSS_COUNTER_INVALID_BIP_MMIE]++;
return;
}
wpa_printf(MSG_DEBUG, "Beacon frame MME KeyID %u", keyid);
wpa_hexdump(MSG_MSGDUMP, "MME IPN", mme + 2, 6);
wpa_hexdump(MSG_MSGDUMP, "MME MIC", mme + 8, mic_len);
if (!bss->igtk_len[keyid]) {
add_note(wt, MSG_DEBUG, "No BIGTK known to validate BIP frame");
return;
}
if (os_memcmp(mme + 2, bss->ipn[keyid], 6) <= 0) {
add_note(wt, MSG_INFO, "BIP replay detected: SA=" MACSTR,
MAC2STR(mgmt->sa));
wpa_hexdump(MSG_INFO, "RX IPN", mme + 2, 6);
wpa_hexdump(MSG_INFO, "Last RX IPN", bss->ipn[keyid], 6);
}
if (check_mmie_mic(bss->mgmt_group_cipher, bss->igtk[keyid],
bss->igtk_len[keyid], data, len) < 0) {
add_note(wt, MSG_INFO, "Invalid MME MIC in a Beacon frame from "
MACSTR, MAC2STR(mgmt->sa));
bss->counters[WLANTEST_BSS_COUNTER_INVALID_BIP_MMIE]++;
return;
}
add_note(wt, MSG_DEBUG, "Valid MME MIC in Beacon frame");
os_memcpy(bss->ipn[keyid], mme + 2, 6);
}
static void rx_mgmt_probe_resp(struct wlantest *wt, const u8 *data, size_t len)
{
const struct ieee80211_mgmt *mgmt;
struct wlantest_bss *bss;
struct ieee802_11_elems elems;
size_t offset;
mgmt = (const struct ieee80211_mgmt *) data;
offset = mgmt->u.probe_resp.variable - data;
if (len < offset)
return;
bss = bss_get(wt, mgmt->bssid);
if (bss == NULL)
return;
bss->counters[WLANTEST_BSS_COUNTER_PROBE_RESPONSE]++;
bss->capab_info = le_to_host16(mgmt->u.probe_resp.capab_info);
if (ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - offset,
&elems, 0) == ParseFailed) {
if (bss->parse_error_reported)
return;
add_note(wt, MSG_INFO, "Invalid IEs in a Probe Response frame "
"from " MACSTR, MAC2STR(mgmt->sa));
bss->parse_error_reported = 1;
return;
}
bss_update(wt, bss, &elems);
}
static void process_fils_auth(struct wlantest *wt, struct wlantest_bss *bss,
struct wlantest_sta *sta,
const struct ieee80211_mgmt *mgmt, size_t len)
{
struct ieee802_11_elems elems;
u16 trans;
struct wpa_ie_data data;
if (sta->auth_alg != WLAN_AUTH_FILS_SK ||
len < IEEE80211_HDRLEN + sizeof(mgmt->u.auth))
return;
trans = le_to_host16(mgmt->u.auth.auth_transaction);
if (ieee802_11_parse_elems(mgmt->u.auth.variable,
len - IEEE80211_HDRLEN -
sizeof(mgmt->u.auth), &elems, 0) ==
ParseFailed)
return;
if (trans == 1) {
if (!elems.rsn_ie) {
add_note(wt, MSG_INFO,
"FILS Authentication frame missing RSNE");
return;
}
if (wpa_parse_wpa_ie_rsn(elems.rsn_ie - 2,
elems.rsn_ie_len + 2, &data) < 0) {
add_note(wt, MSG_INFO,
"Invalid RSNE in FILS Authentication frame");
return;
}
sta->key_mgmt = data.key_mgmt;
sta->pairwise_cipher = data.pairwise_cipher;
}
if (!elems.fils_nonce) {
add_note(wt, MSG_INFO,
"FILS Authentication frame missing nonce");
return;
}
if (os_memcmp(mgmt->sa, mgmt->bssid, ETH_ALEN) == 0)
os_memcpy(sta->anonce, elems.fils_nonce, FILS_NONCE_LEN);
else
os_memcpy(sta->snonce, elems.fils_nonce, FILS_NONCE_LEN);
}
static void process_ft_auth(struct wlantest *wt, struct wlantest_bss *bss,
struct wlantest_sta *sta,
const struct ieee80211_mgmt *mgmt, size_t len)
{
u16 trans;
struct wpa_ft_ies parse;
u8 pmk_r1[PMK_LEN];
u8 pmk_r1_name[WPA_PMK_NAME_LEN];
struct wpa_ptk ptk;
u8 ptk_name[WPA_PMK_NAME_LEN];
struct wlantest_bss *old_bss;
struct wlantest_sta *old_sta = NULL;
if (sta->auth_alg != WLAN_AUTH_FT ||
len < IEEE80211_HDRLEN + sizeof(mgmt->u.auth))
return;
trans = le_to_host16(mgmt->u.auth.auth_transaction);
if (wpa_ft_parse_ies(mgmt->u.auth.variable,
len - IEEE80211_HDRLEN - sizeof(mgmt->u.auth),
&parse, -1)) {
add_note(wt, MSG_INFO,
"Could not parse FT Authentication Response frame");
return;
}
if (trans == 1) {
sta->key_mgmt = parse.key_mgmt;
sta->pairwise_cipher = parse.pairwise_cipher;
return;
}
if (trans != 2)
return;
/* TODO: Should find the latest updated PMK-R0 value here instead
* copying the one from the first found matching old STA entry. */
dl_list_for_each(old_bss, &wt->bss, struct wlantest_bss, list) {
if (old_bss == bss)
continue;
old_sta = sta_find(old_bss, sta->addr);
if (old_sta)
break;
}
if (!old_sta)
return;
os_memcpy(sta->pmk_r0, old_sta->pmk_r0, sizeof(sta->pmk_r0));
os_memcpy(sta->pmk_r0_name, old_sta->pmk_r0_name,
sizeof(sta->pmk_r0_name));
if (parse.r1kh_id)
os_memcpy(bss->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
if (wpa_derive_pmk_r1(sta->pmk_r0, PMK_LEN, sta->pmk_r0_name,
bss->r1kh_id, sta->addr, pmk_r1, pmk_r1_name) < 0)
return;
wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", pmk_r1_name, WPA_PMK_NAME_LEN);
if (!parse.fte_anonce || !parse.fte_snonce ||
wpa_pmk_r1_to_ptk(pmk_r1, PMK_LEN, parse.fte_snonce,
parse.fte_anonce, sta->addr, bss->bssid,
pmk_r1_name, &ptk, ptk_name, sta->key_mgmt,
sta->pairwise_cipher) < 0)
return;
add_note(wt, MSG_DEBUG, "Derived new PTK");
os_memcpy(&sta->ptk, &ptk, sizeof(ptk));
sta->ptk_set = 1;
os_memset(sta->rsc_tods, 0, sizeof(sta->rsc_tods));
os_memset(sta->rsc_fromds, 0, sizeof(sta->rsc_fromds));
}
static void rx_mgmt_auth(struct wlantest *wt, const u8 *data, size_t len)
{
const struct ieee80211_mgmt *mgmt;
struct wlantest_bss *bss;
struct wlantest_sta *sta;
u16 alg, trans, status;
mgmt = (const struct ieee80211_mgmt *) data;
bss = bss_get(wt, mgmt->bssid);
if (bss == NULL)
return;
if (os_memcmp(mgmt->sa, mgmt->bssid, ETH_ALEN) == 0)
sta = sta_get(bss, mgmt->da);
else
sta = sta_get(bss, mgmt->sa);
if (sta == NULL)
return;
if (len < 24 + 6) {
add_note(wt, MSG_INFO, "Too short Authentication frame from "
MACSTR, MAC2STR(mgmt->sa));
return;
}
alg = le_to_host16(mgmt->u.auth.auth_alg);
sta->auth_alg = alg;
trans = le_to_host16(mgmt->u.auth.auth_transaction);
status = le_to_host16(mgmt->u.auth.status_code);
wpa_printf(MSG_DEBUG, "AUTH " MACSTR " -> " MACSTR
" (alg=%u trans=%u status=%u)",
MAC2STR(mgmt->sa), MAC2STR(mgmt->da), alg, trans, status);
if (alg == 0 && trans == 2 && status == 0) {
if (sta->state == STATE1) {
add_note(wt, MSG_DEBUG, "STA " MACSTR
" moved to State 2 with " MACSTR,
MAC2STR(sta->addr), MAC2STR(bss->bssid));
sta->state = STATE2;
}
}
if (os_memcmp(mgmt->sa, mgmt->bssid, ETH_ALEN) == 0)
sta->counters[WLANTEST_STA_COUNTER_AUTH_RX]++;
else
sta->counters[WLANTEST_STA_COUNTER_AUTH_TX]++;
process_fils_auth(wt, bss, sta, mgmt, len);
process_ft_auth(wt, bss, sta, mgmt, len);
}
static void deauth_all_stas(struct wlantest *wt, struct wlantest_bss *bss)
{
struct wlantest_sta *sta;
dl_list_for_each(sta, &bss->sta, struct wlantest_sta, list) {
if (sta->state == STATE1)
continue;
add_note(wt, MSG_DEBUG, "STA " MACSTR
" moved to State 1 with " MACSTR,
MAC2STR(sta->addr), MAC2STR(bss->bssid));
sta->state = STATE1;
}
}
static void tdls_link_down(struct wlantest *wt, struct wlantest_bss *bss,
struct wlantest_sta *sta)
{
struct wlantest_tdls *tdls;
dl_list_for_each(tdls, &bss->tdls, struct wlantest_tdls, list) {
if ((tdls->init == sta || tdls->resp == sta) && tdls->link_up)
{
add_note(wt, MSG_DEBUG, "TDLS: Set link down based on "
"STA deauth/disassoc");
tdls->link_up = 0;
}
}
}
static void rx_mgmt_deauth(struct wlantest *wt, const u8 *data, size_t len,
int valid)
{
const struct ieee80211_mgmt *mgmt;
struct wlantest_bss *bss;
struct wlantest_sta *sta;
u16 fc, reason;
mgmt = (const struct ieee80211_mgmt *) data;
bss = bss_get(wt, mgmt->bssid);
if (bss == NULL)
return;
if (os_memcmp(mgmt->sa, mgmt->bssid, ETH_ALEN) == 0)
sta = sta_get(bss, mgmt->da);
else
sta = sta_get(bss, mgmt->sa);
if (len < 24 + 2) {
add_note(wt, MSG_INFO, "Too short Deauthentication frame from "
MACSTR, MAC2STR(mgmt->sa));
return;
}
reason = le_to_host16(mgmt->u.deauth.reason_code);
wpa_printf(MSG_DEBUG, "DEAUTH " MACSTR " -> " MACSTR
" (reason=%u) (valid=%d)",
MAC2STR(mgmt->sa), MAC2STR(mgmt->da),
reason, valid);
wpa_hexdump(MSG_MSGDUMP, "DEAUTH payload", data + 24, len - 24);
if (sta == NULL) {
if (valid && mgmt->da[0] == 0xff)
deauth_all_stas(wt, bss);
return;
}
if (os_memcmp(mgmt->sa, mgmt->bssid, ETH_ALEN) == 0) {
sta->counters[valid ? WLANTEST_STA_COUNTER_VALID_DEAUTH_RX :
WLANTEST_STA_COUNTER_INVALID_DEAUTH_RX]++;
if (sta->pwrmgt && !sta->pspoll)
sta->counters[WLANTEST_STA_COUNTER_DEAUTH_RX_ASLEEP]++;
else
sta->counters[WLANTEST_STA_COUNTER_DEAUTH_RX_AWAKE]++;
fc = le_to_host16(mgmt->frame_control);
if (!(fc & WLAN_FC_ISWEP) && reason == 6)
sta->counters[WLANTEST_STA_COUNTER_DEAUTH_RX_RC6]++;
else if (!(fc & WLAN_FC_ISWEP) && reason == 7)
sta->counters[WLANTEST_STA_COUNTER_DEAUTH_RX_RC7]++;
} else
sta->counters[valid ? WLANTEST_STA_COUNTER_VALID_DEAUTH_TX :
WLANTEST_STA_COUNTER_INVALID_DEAUTH_TX]++;
if (!valid) {
add_note(wt, MSG_INFO, "Do not change STA " MACSTR " State "
"since Disassociation frame was not protected "
"correctly", MAC2STR(sta->addr));
return;
}
if (sta->state != STATE1) {
add_note(wt, MSG_DEBUG, "STA " MACSTR
" moved to State 1 with " MACSTR,
MAC2STR(sta->addr), MAC2STR(bss->bssid));
sta->state = STATE1;
}
tdls_link_down(wt, bss, sta);
}
static const u8 * get_fils_session(const u8 *ies, size_t ies_len)
{
const u8 *ie, *end;
ie = ies;
end = ((const u8 *) ie) + ies_len;
while (ie + 1 < end) {
if (ie + 2 + ie[1] > end)
break;
if (ie[0] == WLAN_EID_EXTENSION &&
ie[1] >= 1 + FILS_SESSION_LEN &&
ie[2] == WLAN_EID_EXT_FILS_SESSION)
return ie;
ie += 2 + ie[1];
}
return NULL;
}
static int try_rmsk(struct wlantest *wt, struct wlantest_bss *bss,
struct wlantest_sta *sta, struct wlantest_pmk *pmk,
const u8 *frame_start, const u8 *frame_ad,
const u8 *frame_ad_end, const u8 *encr_end)
{
size_t pmk_len = 0;
u8 pmk_buf[PMK_LEN_MAX];
struct wpa_ptk ptk;
u8 ick[FILS_ICK_MAX_LEN];
size_t ick_len;
const u8 *aad[5];
size_t aad_len[5];
u8 buf[2000];
if (fils_rmsk_to_pmk(sta->key_mgmt, pmk->pmk, pmk->pmk_len,
sta->snonce, sta->anonce, NULL, 0,
pmk_buf, &pmk_len) < 0)
return -1;
if (fils_pmk_to_ptk(pmk_buf, pmk_len, sta->addr, bss->bssid,
sta->snonce, sta->anonce, NULL, 0,
&ptk, ick, &ick_len,
sta->key_mgmt, sta->pairwise_cipher,
NULL, NULL) < 0)
return -1;
/* Check AES-SIV decryption with the derived key */
/* AES-SIV AAD vectors */
/* The STA's MAC address */
aad[0] = sta->addr;
aad_len[0] = ETH_ALEN;
/* The AP's BSSID */
aad[1] = bss->bssid;
aad_len[1] = ETH_ALEN;
/* The STA's nonce */
aad[2] = sta->snonce;
aad_len[2] = FILS_NONCE_LEN;
/* The AP's nonce */
aad[3] = sta->anonce;
aad_len[3] = FILS_NONCE_LEN;
/*
* The (Re)Association Request frame from the Capability Information
* field to the FILS Session element (both inclusive).
*/
aad[4] = frame_ad;
aad_len[4] = frame_ad_end - frame_ad;
if (encr_end - frame_ad_end < AES_BLOCK_SIZE ||
encr_end - frame_ad_end > sizeof(buf))
return -1;
if (aes_siv_decrypt(ptk.kek, ptk.kek_len,
frame_ad_end, encr_end - frame_ad_end,
5, aad, aad_len, buf) < 0) {
wpa_printf(MSG_DEBUG,
"FILS: Derived PTK did not match AES-SIV data");
return -1;
}
add_note(wt, MSG_DEBUG, "Derived FILS PTK");
os_memcpy(&sta->ptk, &ptk, sizeof(ptk));
sta->ptk_set = 1;
sta->counters[WLANTEST_STA_COUNTER_PTK_LEARNED]++;
wpa_hexdump(MSG_DEBUG, "FILS: Decrypted Association Request elements",
buf, encr_end - frame_ad_end - AES_BLOCK_SIZE);
if (wt->write_pcap_dumper || wt->pcapng) {
write_pcap_decrypted(wt, frame_start,
frame_ad_end - frame_start,
buf,
encr_end - frame_ad_end - AES_BLOCK_SIZE);
}
return 0;
}
static void derive_fils_keys(struct wlantest *wt, struct wlantest_bss *bss,
struct wlantest_sta *sta, const u8 *frame_start,
const u8 *frame_ad, const u8 *frame_ad_end,
const u8 *encr_end)
{
struct wlantest_pmk *pmk;
wpa_printf(MSG_DEBUG, "Trying to derive PTK for " MACSTR
" from FILS rMSK", MAC2STR(sta->addr));
dl_list_for_each(pmk, &bss->pmk, struct wlantest_pmk,
list) {
wpa_printf(MSG_DEBUG, "Try per-BSS PMK");
if (try_rmsk(wt, bss, sta, pmk, frame_start, frame_ad,
frame_ad_end, encr_end) == 0)
return;
}
dl_list_for_each(pmk, &wt->pmk, struct wlantest_pmk, list) {
wpa_printf(MSG_DEBUG, "Try global PMK");
if (try_rmsk(wt, bss, sta, pmk, frame_start, frame_ad,
frame_ad_end, encr_end) == 0)
return;
}
}
static void rx_mgmt_assoc_req(struct wlantest *wt, const u8 *data, size_t len)
{
const struct ieee80211_mgmt *mgmt;
struct wlantest_bss *bss;
struct wlantest_sta *sta;
struct ieee802_11_elems elems;
const u8 *ie;
size_t ie_len;
mgmt = (const struct ieee80211_mgmt *) data;
bss = bss_get(wt, mgmt->bssid);
if (bss == NULL)
return;
sta = sta_get(bss, mgmt->sa);
if (sta == NULL)
return;
if (len < 24 + 4) {
add_note(wt, MSG_INFO, "Too short Association Request frame "
"from " MACSTR, MAC2STR(mgmt->sa));
return;
}
wpa_printf(MSG_DEBUG, "ASSOCREQ " MACSTR " -> " MACSTR
" (capab=0x%x listen_int=%u)",
MAC2STR(mgmt->sa), MAC2STR(mgmt->da),
le_to_host16(mgmt->u.assoc_req.capab_info),
le_to_host16(mgmt->u.assoc_req.listen_interval));
sta->counters[WLANTEST_STA_COUNTER_ASSOCREQ_TX]++;
ie = mgmt->u.assoc_req.variable;
ie_len = len - (mgmt->u.assoc_req.variable - data);
if (sta->auth_alg == WLAN_AUTH_FILS_SK) {
const u8 *session, *frame_ad, *frame_ad_end, *encr_end;
session = get_fils_session(ie, ie_len);
if (session) {
frame_ad = (const u8 *) &mgmt->u.assoc_req.capab_info;
frame_ad_end = session + 2 + session[1];
encr_end = data + len;
derive_fils_keys(wt, bss, sta, data, frame_ad,
frame_ad_end, encr_end);
ie_len = session - ie;
}
}
if (ieee802_11_parse_elems(ie, ie_len, &elems, 0) == ParseFailed) {
add_note(wt, MSG_INFO, "Invalid IEs in Association Request "
"frame from " MACSTR, MAC2STR(mgmt->sa));
return;
}
sta->assocreq_capab_info = le_to_host16(mgmt->u.assoc_req.capab_info);
sta->assocreq_listen_int =
le_to_host16(mgmt->u.assoc_req.listen_interval);
os_free(sta->assocreq_ies);
sta->assocreq_ies_len = len - (mgmt->u.assoc_req.variable - data);
sta->assocreq_ies = os_malloc(sta->assocreq_ies_len);
if (sta->assocreq_ies)
os_memcpy(sta->assocreq_ies, mgmt->u.assoc_req.variable,
sta->assocreq_ies_len);
sta_update_assoc(sta, &elems);
}
static void decrypt_fils_assoc_resp(struct wlantest *wt,
struct wlantest_bss *bss,
struct wlantest_sta *sta,
const u8 *frame_start, const u8 *frame_ad,
const u8 *frame_ad_end, const u8 *encr_end)
{
const u8 *aad[5];
size_t aad_len[5];
u8 buf[2000];
if (!sta->ptk_set)
return;
/* Check AES-SIV decryption with the derived key */
/* AES-SIV AAD vectors */
/* The AP's BSSID */
aad[0] = bss->bssid;
aad_len[0] = ETH_ALEN;
/* The STA's MAC address */
aad[1] = sta->addr;
aad_len[1] = ETH_ALEN;
/* The AP's nonce */
aad[2] = sta->anonce;
aad_len[2] = FILS_NONCE_LEN;
/* The STA's nonce */
aad[3] = sta->snonce;
aad_len[3] = FILS_NONCE_LEN;
/*
* The (Re)Association Response frame from the Capability Information
* field to the FILS Session element (both inclusive).
*/
aad[4] = frame_ad;
aad_len[4] = frame_ad_end - frame_ad;
if (encr_end - frame_ad_end < AES_BLOCK_SIZE ||
encr_end - frame_ad_end > sizeof(buf))
return;
if (aes_siv_decrypt(sta->ptk.kek, sta->ptk.kek_len,
frame_ad_end, encr_end - frame_ad_end,
5, aad, aad_len, buf) < 0) {
wpa_printf(MSG_DEBUG,
"FILS: Derived PTK did not match AES-SIV data");
return;
}
wpa_hexdump(MSG_DEBUG, "FILS: Decrypted Association Response elements",
buf, encr_end - frame_ad_end - AES_BLOCK_SIZE);
if (wt->write_pcap_dumper || wt->pcapng) {
write_pcap_decrypted(wt, frame_start,
frame_ad_end - frame_start,
buf,
encr_end - frame_ad_end - AES_BLOCK_SIZE);
}
}
static void rx_mgmt_assoc_resp(struct wlantest *wt, const u8 *data, size_t len)
{
const struct ieee80211_mgmt *mgmt;
struct wlantest_bss *bss;
struct wlantest_sta *sta;
u16 capab, status, aid;
const u8 *ies;
size_t ies_len;
struct wpa_ft_ies parse;
mgmt = (const struct ieee80211_mgmt *) data;
bss = bss_get(wt, mgmt->bssid);
if (bss == NULL)
return;
sta = sta_get(bss, mgmt->da);
if (sta == NULL)
return;
if (len < 24 + 6) {
add_note(wt, MSG_INFO, "Too short Association Response frame "
"from " MACSTR, MAC2STR(mgmt->sa));
return;
}
ies = mgmt->u.assoc_resp.variable;
ies_len = len - (mgmt->u.assoc_resp.variable - data);
capab = le_to_host16(mgmt->u.assoc_resp.capab_info);
status = le_to_host16(mgmt->u.assoc_resp.status_code);
aid = le_to_host16(mgmt->u.assoc_resp.aid);
wpa_printf(MSG_DEBUG, "ASSOCRESP " MACSTR " -> " MACSTR
" (capab=0x%x status=%u aid=%u)",
MAC2STR(mgmt->sa), MAC2STR(mgmt->da), capab, status,
aid & 0x3fff);
if (sta->auth_alg == WLAN_AUTH_FILS_SK) {
const u8 *session, *frame_ad, *frame_ad_end, *encr_end;
session = get_fils_session(ies, ies_len);
if (session) {
frame_ad = (const u8 *) &mgmt->u.assoc_resp.capab_info;
frame_ad_end = session + 2 + session[1];
encr_end = data + len;
decrypt_fils_assoc_resp(wt, bss, sta, data, frame_ad,
frame_ad_end, encr_end);
ies_len = session - ies;
}
}
if (status == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY) {
struct ieee802_11_elems elems;
if (ieee802_11_parse_elems(ies, ies_len, &elems, 0) ==
ParseFailed) {
add_note(wt, MSG_INFO, "Failed to parse IEs in "
"AssocResp from " MACSTR,
MAC2STR(mgmt->sa));
} else if (elems.timeout_int == NULL ||
elems.timeout_int[0] !=
WLAN_TIMEOUT_ASSOC_COMEBACK) {
add_note(wt, MSG_INFO, "No valid Timeout Interval IE "
"with Assoc Comeback time in AssocResp "
"(status=30) from " MACSTR,
MAC2STR(mgmt->sa));
} else {
sta->counters[
WLANTEST_STA_COUNTER_ASSOCRESP_COMEBACK]++;
}
}
if (status)
return;
if ((aid & 0xc000) != 0xc000) {
add_note(wt, MSG_DEBUG, "Two MSBs of the AID were not set to 1 "
"in Association Response from " MACSTR,
MAC2STR(mgmt->sa));
}
sta->aid = aid & 0xc000;
if (sta->state < STATE2) {
add_note(wt, MSG_DEBUG,
"STA " MACSTR " was not in State 2 when "
"getting associated", MAC2STR(sta->addr));
}
if (sta->state < STATE3) {
add_note(wt, MSG_DEBUG, "STA " MACSTR
" moved to State 3 with " MACSTR,
MAC2STR(sta->addr), MAC2STR(bss->bssid));
sta->state = STATE3;
}
if (wpa_ft_parse_ies(ies, ies_len, &parse, 0) == 0) {
if (parse.r0kh_id) {
os_memcpy(bss->r0kh_id, parse.r0kh_id,
parse.r0kh_id_len);
bss->r0kh_id_len = parse.r0kh_id_len;
}
if (parse.r1kh_id)
os_memcpy(bss->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
}
}
static void rx_mgmt_reassoc_req(struct wlantest *wt, const u8 *data,
size_t len)
{
const struct ieee80211_mgmt *mgmt;
struct wlantest_bss *bss;
struct wlantest_sta *sta;
struct ieee802_11_elems elems;
const u8 *ie;
size_t ie_len;
mgmt = (const struct ieee80211_mgmt *) data;
bss = bss_get(wt, mgmt->bssid);
if (bss == NULL)
return;
sta = sta_get(bss, mgmt->sa);
if (sta == NULL)
return;
if (len < 24 + 4 + ETH_ALEN) {
add_note(wt, MSG_INFO, "Too short Reassociation Request frame "
"from " MACSTR, MAC2STR(mgmt->sa));
return;
}
wpa_printf(MSG_DEBUG, "REASSOCREQ " MACSTR " -> " MACSTR
" (capab=0x%x listen_int=%u current_ap=" MACSTR ")",
MAC2STR(mgmt->sa), MAC2STR(mgmt->da),
le_to_host16(mgmt->u.reassoc_req.capab_info),
le_to_host16(mgmt->u.reassoc_req.listen_interval),
MAC2STR(mgmt->u.reassoc_req.current_ap));
sta->counters[WLANTEST_STA_COUNTER_REASSOCREQ_TX]++;
ie = mgmt->u.reassoc_req.variable;
ie_len = len - (mgmt->u.reassoc_req.variable - data);
if (sta->auth_alg == WLAN_AUTH_FILS_SK) {
const u8 *session, *frame_ad, *frame_ad_end, *encr_end;
session = get_fils_session(ie, ie_len);
if (session) {
frame_ad = (const u8 *) &mgmt->u.reassoc_req.capab_info;
frame_ad_end = session + 2 + session[1];
encr_end = data + len;
derive_fils_keys(wt, bss, sta, data, frame_ad,
frame_ad_end, encr_end);
ie_len = session - ie;
}
}
if (ieee802_11_parse_elems(ie, ie_len, &elems, 0) == ParseFailed) {
add_note(wt, MSG_INFO, "Invalid IEs in Reassociation Request "
"frame from " MACSTR, MAC2STR(mgmt->sa));
return;
}
sta->assocreq_capab_info =
le_to_host16(mgmt->u.reassoc_req.capab_info);
sta->assocreq_listen_int =
le_to_host16(mgmt->u.reassoc_req.listen_interval);
os_free(sta->assocreq_ies);
sta->assocreq_ies_len = len - (mgmt->u.reassoc_req.variable - data);
sta->assocreq_ies = os_malloc(sta->assocreq_ies_len);
if (sta->assocreq_ies)
os_memcpy(sta->assocreq_ies, mgmt->u.reassoc_req.variable,
sta->assocreq_ies_len);
sta_update_assoc(sta, &elems);
/* TODO: FT protocol: verify FTE MIC and update GTK/IGTK for the BSS */
}
static void rx_mgmt_reassoc_resp(struct wlantest *wt, const u8 *data,
size_t len)
{
const struct ieee80211_mgmt *mgmt;
struct wlantest_bss *bss;
struct wlantest_sta *sta;
u16 capab, status, aid;
const u8 *ies;
size_t ies_len;
mgmt = (const struct ieee80211_mgmt *) data;
bss = bss_get(wt, mgmt->bssid);
if (bss == NULL)
return;
sta = sta_get(bss, mgmt->da);
if (sta == NULL)
return;
if (len < 24 + 6) {
add_note(wt, MSG_INFO, "Too short Reassociation Response frame "
"from " MACSTR, MAC2STR(mgmt->sa));
return;
}
ies = mgmt->u.reassoc_resp.variable;
ies_len = len - (mgmt->u.reassoc_resp.variable - data);
capab = le_to_host16(mgmt->u.reassoc_resp.capab_info);
status = le_to_host16(mgmt->u.reassoc_resp.status_code);
aid = le_to_host16(mgmt->u.reassoc_resp.aid);
wpa_printf(MSG_DEBUG, "REASSOCRESP " MACSTR " -> " MACSTR
" (capab=0x%x status=%u aid=%u)",
MAC2STR(mgmt->sa), MAC2STR(mgmt->da), capab, status,
aid & 0x3fff);
if (sta->auth_alg == WLAN_AUTH_FILS_SK) {
const u8 *session, *frame_ad, *frame_ad_end, *encr_end;
session = get_fils_session(ies, ies_len);
if (session) {
frame_ad = (const u8 *)
&mgmt->u.reassoc_resp.capab_info;
frame_ad_end = session + 2 + session[1];
encr_end = data + len;
decrypt_fils_assoc_resp(wt, bss, sta, data, frame_ad,
frame_ad_end, encr_end);
ies_len = session - ies;
}
}
if (status == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY) {
struct ieee802_11_elems elems;
if (ieee802_11_parse_elems(ies, ies_len, &elems, 0) ==
ParseFailed) {
add_note(wt, MSG_INFO, "Failed to parse IEs in "
"ReassocResp from " MACSTR,
MAC2STR(mgmt->sa));
} else if (elems.timeout_int == NULL ||
elems.timeout_int[0] !=
WLAN_TIMEOUT_ASSOC_COMEBACK) {
add_note(wt, MSG_INFO, "No valid Timeout Interval IE "
"with Assoc Comeback time in ReassocResp "
"(status=30) from " MACSTR,
MAC2STR(mgmt->sa));
} else {
sta->counters[
WLANTEST_STA_COUNTER_REASSOCRESP_COMEBACK]++;
}
}
if (status)
return;
if ((aid & 0xc000) != 0xc000) {
add_note(wt, MSG_DEBUG, "Two MSBs of the AID were not set to 1 "
"in Reassociation Response from " MACSTR,
MAC2STR(mgmt->sa));
}
sta->aid = aid & 0xc000;
if (sta->state < STATE2) {
add_note(wt, MSG_DEBUG,
"STA " MACSTR " was not in State 2 when "
"getting associated", MAC2STR(sta->addr));
}
if (sta->state < STATE3) {
add_note(wt, MSG_DEBUG, "STA " MACSTR
" moved to State 3 with " MACSTR,
MAC2STR(sta->addr), MAC2STR(bss->bssid));
sta->state = STATE3;
}
}
static void disassoc_all_stas(struct wlantest *wt, struct wlantest_bss *bss)
{
struct wlantest_sta *sta;
dl_list_for_each(sta, &bss->sta, struct wlantest_sta, list) {
if (sta->state <= STATE2)
continue;
add_note(wt, MSG_DEBUG, "STA " MACSTR
" moved to State 2 with " MACSTR,
MAC2STR(sta->addr), MAC2STR(bss->bssid));
sta->state = STATE2;
}
}
static void rx_mgmt_disassoc(struct wlantest *wt, const u8 *data, size_t len,
int valid)
{
const struct ieee80211_mgmt *mgmt;
struct wlantest_bss *bss;
struct wlantest_sta *sta;
u16 fc, reason;
mgmt = (const struct ieee80211_mgmt *) data;
bss = bss_get(wt, mgmt->bssid);
if (bss == NULL)
return;
if (os_memcmp(mgmt->sa, mgmt->bssid, ETH_ALEN) == 0)
sta = sta_get(bss, mgmt->da);
else
sta = sta_get(bss, mgmt->sa);
if (len < 24 + 2) {
add_note(wt, MSG_INFO, "Too short Disassociation frame from "
MACSTR, MAC2STR(mgmt->sa));
return;
}
reason = le_to_host16(mgmt->u.disassoc.reason_code);
wpa_printf(MSG_DEBUG, "DISASSOC " MACSTR " -> " MACSTR
" (reason=%u) (valid=%d)",
MAC2STR(mgmt->sa), MAC2STR(mgmt->da),
reason, valid);
wpa_hexdump(MSG_MSGDUMP, "DISASSOC payload", data + 24, len - 24);
if (sta == NULL) {
if (valid && mgmt->da[0] == 0xff)
disassoc_all_stas(wt, bss);
return;
}
if (os_memcmp(mgmt->sa, mgmt->bssid, ETH_ALEN) == 0) {
sta->counters[valid ? WLANTEST_STA_COUNTER_VALID_DISASSOC_RX :
WLANTEST_STA_COUNTER_INVALID_DISASSOC_RX]++;
if (sta->pwrmgt && !sta->pspoll)
sta->counters[
WLANTEST_STA_COUNTER_DISASSOC_RX_ASLEEP]++;
else
sta->counters[
WLANTEST_STA_COUNTER_DISASSOC_RX_AWAKE]++;
fc = le_to_host16(mgmt->frame_control);
if (!(fc & WLAN_FC_ISWEP) && reason == 6)
sta->counters[WLANTEST_STA_COUNTER_DISASSOC_RX_RC6]++;
else if (!(fc & WLAN_FC_ISWEP) && reason == 7)
sta->counters[WLANTEST_STA_COUNTER_DISASSOC_RX_RC7]++;
} else
sta->counters[valid ? WLANTEST_STA_COUNTER_VALID_DISASSOC_TX :
WLANTEST_STA_COUNTER_INVALID_DISASSOC_TX]++;
if (!valid) {
add_note(wt, MSG_INFO, "Do not change STA " MACSTR " State "
"since Disassociation frame was not protected "
"correctly", MAC2STR(sta->addr));
return;
}
if (sta->state < STATE2) {
add_note(wt, MSG_DEBUG,
"STA " MACSTR " was not in State 2 or 3 "
"when getting disassociated", MAC2STR(sta->addr));
}
if (sta->state > STATE2) {
add_note(wt, MSG_DEBUG, "STA " MACSTR
" moved to State 2 with " MACSTR,
MAC2STR(sta->addr), MAC2STR(bss->bssid));
sta->state = STATE2;
}
tdls_link_down(wt, bss, sta);
}
static void rx_mgmt_action_ft_request(struct wlantest *wt,
const struct ieee80211_mgmt *mgmt,
size_t len)
{
const u8 *ies;
size_t ies_len;
struct wpa_ft_ies parse;
struct wlantest_bss *bss;
struct wlantest_sta *sta;
if (len < 24 + 2 + 2 * ETH_ALEN) {
add_note(wt, MSG_INFO, "Too short FT Request frame");
return;
}
wpa_printf(MSG_DEBUG, "FT Request: STA Address: " MACSTR
" Target AP Address: " MACSTR,
MAC2STR(mgmt->u.action.u.ft_action_req.sta_addr),
MAC2STR(mgmt->u.action.u.ft_action_req.target_ap_addr));
ies = mgmt->u.action.u.ft_action_req.variable;
ies_len = len - (24 + 2 + 2 * ETH_ALEN);
wpa_hexdump(MSG_DEBUG, "FT Request frame body", ies, ies_len);
if (wpa_ft_parse_ies(ies, ies_len, &parse, -1)) {
add_note(wt, MSG_INFO, "Could not parse FT Request frame body");
return;
}
bss = bss_get(wt, mgmt->u.action.u.ft_action_resp.target_ap_addr);
if (!bss) {
add_note(wt, MSG_INFO, "No BSS entry for Target AP");
return;
}
sta = sta_get(bss, mgmt->sa);
if (!sta)
return;
sta->key_mgmt = parse.key_mgmt;
sta->pairwise_cipher = parse.pairwise_cipher;
}
static void rx_mgmt_action_ft_response(struct wlantest *wt,
struct wlantest_sta *sta,
const struct ieee80211_mgmt *mgmt,
size_t len)
{
struct wlantest_bss *bss;
struct wlantest_sta *new_sta;
const u8 *ies;
size_t ies_len;
struct wpa_ft_ies parse;
u8 pmk_r1[PMK_LEN];
u8 pmk_r1_name[WPA_PMK_NAME_LEN];
struct wpa_ptk ptk;
u8 ptk_name[WPA_PMK_NAME_LEN];
if (len < 24 + 2 + 2 * ETH_ALEN + 2) {
add_note(wt, MSG_INFO, "Too short FT Response frame from "
MACSTR, MAC2STR(mgmt->sa));
return;
}
wpa_printf(MSG_DEBUG, "FT Response: STA Address: " MACSTR
" Target AP Address: " MACSTR " Status Code: %u",
MAC2STR(mgmt->u.action.u.ft_action_resp.sta_addr),
MAC2STR(mgmt->u.action.u.ft_action_resp.target_ap_addr),
le_to_host16(mgmt->u.action.u.ft_action_resp.status_code));
ies = mgmt->u.action.u.ft_action_req.variable;
ies_len = len - (24 + 2 + 2 * ETH_ALEN);
wpa_hexdump(MSG_DEBUG, "FT Response frame body", ies, ies_len);
if (wpa_ft_parse_ies(ies, ies_len, &parse, -1)) {
add_note(wt, MSG_INFO,
"Could not parse FT Response frame body");
return;
}
bss = bss_get(wt, mgmt->u.action.u.ft_action_resp.target_ap_addr);
if (!bss) {
add_note(wt, MSG_INFO, "No BSS entry for Target AP");
return;
}
if (parse.r1kh_id)
os_memcpy(bss->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
if (wpa_derive_pmk_r1(sta->pmk_r0, PMK_LEN, sta->pmk_r0_name,
bss->r1kh_id, sta->addr, pmk_r1, pmk_r1_name) < 0)
return;
wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", pmk_r1_name, WPA_PMK_NAME_LEN);
new_sta = sta_get(bss, sta->addr);
if (!new_sta)
return;
os_memcpy(new_sta->pmk_r0, sta->pmk_r0, sizeof(sta->pmk_r0));
os_memcpy(new_sta->pmk_r0_name, sta->pmk_r0_name,
sizeof(sta->pmk_r0_name));
if (!parse.fte_anonce || !parse.fte_snonce ||
wpa_pmk_r1_to_ptk(pmk_r1, PMK_LEN, parse.fte_snonce,
parse.fte_anonce, new_sta->addr, bss->bssid,
pmk_r1_name, &ptk, ptk_name, new_sta->key_mgmt,
new_sta->pairwise_cipher) < 0)
return;
add_note(wt, MSG_DEBUG, "Derived new PTK");
os_memcpy(&new_sta->ptk, &ptk, sizeof(ptk));
new_sta->ptk_set = 1;
os_memset(new_sta->rsc_tods, 0, sizeof(new_sta->rsc_tods));
os_memset(new_sta->rsc_fromds, 0, sizeof(new_sta->rsc_fromds));
}
static void rx_mgmt_action_ft(struct wlantest *wt, struct wlantest_sta *sta,
const struct ieee80211_mgmt *mgmt,
size_t len, int valid)
{
if (len < 24 + 2) {
add_note(wt, MSG_INFO, "Too short FT Action frame from " MACSTR,
MAC2STR(mgmt->sa));
return;
}
switch (mgmt->u.action.u.ft_action_req.action) {
case 1:
rx_mgmt_action_ft_request(wt, mgmt, len);
break;
case 2:
rx_mgmt_action_ft_response(wt, sta, mgmt, len);
break;
default:
add_note(wt, MSG_INFO, "Unsupported FT action value %u from "
MACSTR, mgmt->u.action.u.ft_action_req.action,
MAC2STR(mgmt->sa));
}
}
static void rx_mgmt_action_sa_query_req(struct wlantest *wt,
struct wlantest_sta *sta,
const struct ieee80211_mgmt *mgmt,
size_t len, int valid)
{
const u8 *rx_id;
u8 *id;
rx_id = (const u8 *) mgmt->u.action.u.sa_query_req.trans_id;
if (os_memcmp(mgmt->sa, mgmt->bssid, ETH_ALEN) == 0)
id = sta->ap_sa_query_tr;
else
id = sta->sta_sa_query_tr;
add_note(wt, MSG_INFO, "SA Query Request " MACSTR " -> " MACSTR
" (trans_id=%02x%02x)%s",
MAC2STR(mgmt->sa), MAC2STR(mgmt->da), rx_id[0], rx_id[1],
valid ? "" : " (invalid protection)");
os_memcpy(id, mgmt->u.action.u.sa_query_req.trans_id, 2);
if (os_memcmp(mgmt->sa, sta->addr, ETH_ALEN) == 0)
sta->counters[valid ?
WLANTEST_STA_COUNTER_VALID_SAQUERYREQ_TX :
WLANTEST_STA_COUNTER_INVALID_SAQUERYREQ_TX]++;
else
sta->counters[valid ?
WLANTEST_STA_COUNTER_VALID_SAQUERYREQ_RX :
WLANTEST_STA_COUNTER_INVALID_SAQUERYREQ_RX]++;
}
static void rx_mgmt_action_sa_query_resp(struct wlantest *wt,
struct wlantest_sta *sta,
const struct ieee80211_mgmt *mgmt,
size_t len, int valid)
{
const u8 *rx_id;
u8 *id;
int match;
rx_id = (const u8 *) mgmt->u.action.u.sa_query_resp.trans_id;
if (os_memcmp(mgmt->sa, mgmt->bssid, ETH_ALEN) == 0)
id = sta->sta_sa_query_tr;
else
id = sta->ap_sa_query_tr;
match = os_memcmp(rx_id, id, 2) == 0;
add_note(wt, MSG_INFO, "SA Query Response " MACSTR " -> " MACSTR
" (trans_id=%02x%02x; %s)%s",
MAC2STR(mgmt->sa), MAC2STR(mgmt->da), rx_id[0], rx_id[1],
match ? "match" : "mismatch",
valid ? "" : " (invalid protection)");
if (os_memcmp(mgmt->sa, sta->addr, ETH_ALEN) == 0)
sta->counters[(valid && match) ?
WLANTEST_STA_COUNTER_VALID_SAQUERYRESP_TX :
WLANTEST_STA_COUNTER_INVALID_SAQUERYRESP_TX]++;
else
sta->counters[(valid && match) ?
WLANTEST_STA_COUNTER_VALID_SAQUERYRESP_RX :
WLANTEST_STA_COUNTER_INVALID_SAQUERYRESP_RX]++;
}
static void rx_mgmt_action_sa_query(struct wlantest *wt,
struct wlantest_sta *sta,
const struct ieee80211_mgmt *mgmt,
size_t len, int valid)
{
if (len < 24 + 2 + WLAN_SA_QUERY_TR_ID_LEN) {
add_note(wt, MSG_INFO, "Too short SA Query frame from " MACSTR,
MAC2STR(mgmt->sa));
return;
}
if (len > 24 + 2 + WLAN_SA_QUERY_TR_ID_LEN) {
size_t elen = len - (24 + 2 + WLAN_SA_QUERY_TR_ID_LEN);
add_note(wt, MSG_INFO, "Unexpected %u octets of extra data at "
"the end of SA Query frame from " MACSTR,
(unsigned) elen, MAC2STR(mgmt->sa));
wpa_hexdump(MSG_INFO, "SA Query extra data",
((const u8 *) mgmt) + len - elen, elen);
}
switch (mgmt->u.action.u.sa_query_req.action) {
case WLAN_SA_QUERY_REQUEST:
rx_mgmt_action_sa_query_req(wt, sta, mgmt, len, valid);
break;
case WLAN_SA_QUERY_RESPONSE:
rx_mgmt_action_sa_query_resp(wt, sta, mgmt, len, valid);
break;
default:
add_note(wt, MSG_INFO, "Unexpected SA Query action value %u "
"from " MACSTR,
mgmt->u.action.u.sa_query_req.action,
MAC2STR(mgmt->sa));
}
}
static void rx_mgmt_action(struct wlantest *wt, const u8 *data, size_t len,
int valid)
{
const struct ieee80211_mgmt *mgmt;
struct wlantest_bss *bss;
struct wlantest_sta *sta;
mgmt = (const struct ieee80211_mgmt *) data;
if (mgmt->da[0] & 0x01) {
add_note(wt, MSG_DEBUG, "Group addressed Action frame: DA="
MACSTR " SA=" MACSTR " BSSID=" MACSTR
" category=%u",
MAC2STR(mgmt->da), MAC2STR(mgmt->sa),
MAC2STR(mgmt->bssid), mgmt->u.action.category);
return; /* Ignore group addressed Action frames for now */
}
bss = bss_get(wt, mgmt->bssid);
if (bss == NULL)
return;
if (os_memcmp(mgmt->sa, mgmt->bssid, ETH_ALEN) == 0)
sta = sta_get(bss, mgmt->da);
else
sta = sta_get(bss, mgmt->sa);
if (sta == NULL)
return;
if (len < 24 + 1) {
add_note(wt, MSG_INFO, "Too short Action frame from " MACSTR,
MAC2STR(mgmt->sa));
return;
}
wpa_printf(MSG_DEBUG, "ACTION " MACSTR " -> " MACSTR
" (category=%u) (valid=%d)",
MAC2STR(mgmt->sa), MAC2STR(mgmt->da),
mgmt->u.action.category, valid);
wpa_hexdump(MSG_MSGDUMP, "ACTION payload", data + 24, len - 24);
if (mgmt->u.action.category != WLAN_ACTION_PUBLIC &&
sta->state < STATE3) {
add_note(wt, MSG_INFO, "Action frame sent when STA is not in "
"State 3 (SA=" MACSTR " DATA=" MACSTR ")",
MAC2STR(mgmt->sa), MAC2STR(mgmt->da));
}
switch (mgmt->u.action.category) {
case WLAN_ACTION_FT:
rx_mgmt_action_ft(wt, sta, mgmt, len, valid);
break;
case WLAN_ACTION_SA_QUERY:
rx_mgmt_action_sa_query(wt, sta, mgmt, len, valid);
break;
}
}
static int check_mmie_mic(unsigned int mgmt_group_cipher,
const u8 *igtk, size_t igtk_len,
const u8 *data, size_t len)
{
u8 *buf;
u8 mic[16];
u16 fc;
const struct ieee80211_hdr *hdr;
int ret, mic_len;
if (!mgmt_group_cipher || igtk_len < 16)
return -1;
mic_len = mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC ? 8 : 16;
if (len < 24 || len - 24 < mic_len)
return -1;
buf = os_malloc(len + 20 - 24);
if (buf == NULL)
return -1;
/* BIP AAD: FC(masked) A1 A2 A3 */
hdr = (const struct ieee80211_hdr *) data;
fc = le_to_host16(hdr->frame_control);
fc &= ~(WLAN_FC_RETRY | WLAN_FC_PWRMGT | WLAN_FC_MOREDATA);
WPA_PUT_LE16(buf, fc);
os_memcpy(buf + 2, hdr->addr1, 3 * ETH_ALEN);
/* Frame body with MMIE MIC masked to zero */
os_memcpy(buf + 20, data + 24, len - 24 - mic_len);
os_memset(buf + 20 + len - 24 - mic_len, 0, mic_len);
if (WLAN_FC_GET_STYPE(fc) == WLAN_FC_STYPE_BEACON) {
/* Timestamp field masked to zero */
os_memset(buf + 20, 0, 8);
}
wpa_hexdump(MSG_MSGDUMP, "BIP: AAD|Body(masked)", buf, len + 20 - 24);
/* MIC = L(AES-128-CMAC(AAD || Frame Body(masked)), 0, 64) */
if (mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
ret = omac1_aes_128(igtk, buf, len + 20 - 24, mic);
} else if (mgmt_group_cipher == WPA_CIPHER_BIP_CMAC_256) {
ret = omac1_aes_256(igtk, buf, len + 20 - 24, mic);
} else if (mgmt_group_cipher == WPA_CIPHER_BIP_GMAC_128 ||
mgmt_group_cipher == WPA_CIPHER_BIP_GMAC_256) {
u8 nonce[12], *npos;
const u8 *ipn;
ipn = data + len - mic_len - 6;
/* Nonce: A2 | IPN */
os_memcpy(nonce, hdr->addr2, ETH_ALEN);
npos = nonce + ETH_ALEN;
*npos++ = ipn[5];
*npos++ = ipn[4];
*npos++ = ipn[3];
*npos++ = ipn[2];
*npos++ = ipn[1];
*npos++ = ipn[0];
ret = aes_gmac(igtk, igtk_len, nonce, sizeof(nonce),
buf, len + 20 - 24, mic);
} else {
ret = -1;
}
if (ret < 0) {
os_free(buf);
return -1;
}
os_free(buf);
if (os_memcmp(data + len - mic_len, mic, mic_len) != 0)
return -1;
return 0;
}
static int check_bip(struct wlantest *wt, const u8 *data, size_t len)
{
const struct ieee80211_mgmt *mgmt;
u16 fc, stype;
const u8 *mmie;
u16 keyid;
struct wlantest_bss *bss;
size_t mic_len;
mgmt = (const struct ieee80211_mgmt *) data;
fc = le_to_host16(mgmt->frame_control);
stype = WLAN_FC_GET_STYPE(fc);
if (stype == WLAN_FC_STYPE_ACTION) {
if (len < 24 + 1)
return 0;
if (mgmt->u.action.category == WLAN_ACTION_PUBLIC)
return 0; /* Not a robust management frame */
}
bss = bss_get(wt, mgmt->bssid);
if (bss == NULL)
return 0; /* No key known yet */
mic_len = bss->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC ? 8 : 16;
if (len < 24 + 10 + mic_len ||
data[len - (10 + mic_len)] != WLAN_EID_MMIE ||
data[len - (10 + mic_len - 1)] != 8 + mic_len) {
/* No MMIE */
if (bss->rsn_capab & WPA_CAPABILITY_MFPC) {
add_note(wt, MSG_INFO, "Robust group-addressed "
"management frame sent without BIP by "
MACSTR, MAC2STR(mgmt->sa));
bss->counters[WLANTEST_BSS_COUNTER_MISSING_BIP_MMIE]++;
return -1;
}
return 0;
}
mmie = data + len - (8 + mic_len);
keyid = WPA_GET_LE16(mmie);
if (keyid & 0xf000) {
add_note(wt, MSG_INFO, "MMIE KeyID reserved bits not zero "
"(%04x) from " MACSTR, keyid, MAC2STR(mgmt->sa));
keyid &= 0x0fff;
}
if (keyid < 4 || keyid > 5) {
add_note(wt, MSG_INFO, "Unexpected MMIE KeyID %u from " MACSTR,
keyid, MAC2STR(mgmt->sa));
bss->counters[WLANTEST_BSS_COUNTER_INVALID_BIP_MMIE]++;
return 0;
}
wpa_printf(MSG_DEBUG, "MMIE KeyID %u", keyid);
wpa_hexdump(MSG_MSGDUMP, "MMIE IPN", mmie + 2, 6);
wpa_hexdump(MSG_MSGDUMP, "MMIE MIC", mmie + 8, mic_len);
if (!bss->igtk_len[keyid]) {
add_note(wt, MSG_DEBUG, "No IGTK known to validate BIP frame");
return 0;
}
if (os_memcmp(mmie + 2, bss->ipn[keyid], 6) <= 0) {
add_note(wt, MSG_INFO, "BIP replay detected: SA=" MACSTR,
MAC2STR(mgmt->sa));
wpa_hexdump(MSG_INFO, "RX IPN", mmie + 2, 6);
wpa_hexdump(MSG_INFO, "Last RX IPN", bss->ipn[keyid], 6);
}
if (check_mmie_mic(bss->mgmt_group_cipher, bss->igtk[keyid],
bss->igtk_len[keyid], data, len) < 0) {
add_note(wt, MSG_INFO, "Invalid MMIE MIC in a frame from "
MACSTR, MAC2STR(mgmt->sa));
bss->counters[WLANTEST_BSS_COUNTER_INVALID_BIP_MMIE]++;
return -1;
}
add_note(wt, MSG_DEBUG, "Valid MMIE MIC");
os_memcpy(bss->ipn[keyid], mmie + 2, 6);
bss->counters[WLANTEST_BSS_COUNTER_VALID_BIP_MMIE]++;
if (stype == WLAN_FC_STYPE_DEAUTH)
bss->counters[WLANTEST_BSS_COUNTER_BIP_DEAUTH]++;
else if (stype == WLAN_FC_STYPE_DISASSOC)
bss->counters[WLANTEST_BSS_COUNTER_BIP_DISASSOC]++;
return 0;
}
static u8 * mgmt_ccmp_decrypt(struct wlantest *wt, const u8 *data, size_t len,
size_t *dlen)
{
struct wlantest_bss *bss;
struct wlantest_sta *sta;
const struct ieee80211_hdr *hdr;
int keyid;
u8 *decrypted, *frame = NULL;
u8 pn[6], *rsc;
hdr = (const struct ieee80211_hdr *) data;
bss = bss_get(wt, hdr->addr3);
if (bss == NULL)
return NULL;
if (os_memcmp(hdr->addr1, hdr->addr3, ETH_ALEN) == 0)
sta = sta_get(bss, hdr->addr2);
else
sta = sta_get(bss, hdr->addr1);
if (sta == NULL || !sta->ptk_set) {
add_note(wt, MSG_MSGDUMP, "No PTK known to decrypt the frame");
return NULL;
}
if (len < 24 + 4)
return NULL;
if (!(data[24 + 3] & 0x20)) {
add_note(wt, MSG_INFO, "Expected CCMP frame from " MACSTR
" did not have ExtIV bit set to 1",
MAC2STR(hdr->addr2));
return NULL;
}
if (data[24 + 2] != 0 || (data[24 + 3] & 0x1f) != 0) {
add_note(wt, MSG_INFO, "CCMP mgmt frame from " MACSTR " used "
"non-zero reserved bit", MAC2STR(hdr->addr2));
}
keyid = data[24 + 3] >> 6;
if (keyid != 0) {
add_note(wt, MSG_INFO, "Unexpected non-zero KeyID %d in "
"individually addressed Management frame from "
MACSTR, keyid, MAC2STR(hdr->addr2));
}
if (os_memcmp(hdr->addr1, hdr->addr3, ETH_ALEN) == 0)
rsc = sta->rsc_tods[16];
else
rsc = sta->rsc_fromds[16];
ccmp_get_pn(pn, data + 24);
if (os_memcmp(pn, rsc, 6) <= 0) {
u16 seq_ctrl = le_to_host16(hdr->seq_ctrl);
add_note(wt, MSG_INFO, "CCMP/TKIP replay detected: A1=" MACSTR
" A2=" MACSTR " A3=" MACSTR " seq=%u frag=%u%s",
MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
MAC2STR(hdr->addr3),
WLAN_GET_SEQ_SEQ(seq_ctrl),
WLAN_GET_SEQ_FRAG(seq_ctrl),
(le_to_host16(hdr->frame_control) & WLAN_FC_RETRY) ?
" Retry" : "");
wpa_hexdump(MSG_INFO, "RX PN", pn, 6);
wpa_hexdump(MSG_INFO, "RSC", rsc, 6);
}
decrypted = ccmp_decrypt(sta->ptk.tk, hdr, data + 24, len - 24, dlen);
if (decrypted) {
os_memcpy(rsc, pn, 6);
frame = os_malloc(24 + *dlen);
if (frame) {
os_memcpy(frame, data, 24);
os_memcpy(frame + 24, decrypted, *dlen);
*dlen += 24;
}
} else {
/* Assume the frame was corrupted and there was no FCS to check.
* Allow retry of this particular frame to be processed so that
* it could end up getting decrypted if it was received without
* corruption. */
sta->allow_duplicate = 1;
}
os_free(decrypted);
return frame;
}
static int check_mgmt_ccmp(struct wlantest *wt, const u8 *data, size_t len)
{
const struct ieee80211_mgmt *mgmt;
u16 fc;
struct wlantest_bss *bss;
struct wlantest_sta *sta;
mgmt = (const struct ieee80211_mgmt *) data;
fc = le_to_host16(mgmt->frame_control);
if (WLAN_FC_GET_STYPE(fc) == WLAN_FC_STYPE_ACTION) {
if (len > 24 &&
mgmt->u.action.category == WLAN_ACTION_PUBLIC)
return 0; /* Not a robust management frame */
}
bss = bss_get(wt, mgmt->bssid);
if (bss == NULL)
return 0;
if (os_memcmp(mgmt->da, mgmt->bssid, ETH_ALEN) == 0)
sta = sta_get(bss, mgmt->sa);
else
sta = sta_get(bss, mgmt->da);
if (sta == NULL)
return 0;
if ((sta->rsn_capab & WPA_CAPABILITY_MFPC) &&
(sta->state == STATE3 ||
WLAN_FC_GET_STYPE(fc) == WLAN_FC_STYPE_ACTION)) {
add_note(wt, MSG_INFO, "Robust individually-addressed "
"management frame sent without CCMP by "
MACSTR, MAC2STR(mgmt->sa));
return -1;
}
return 0;
}
void rx_mgmt(struct wlantest *wt, const u8 *data, size_t len)
{
const struct ieee80211_hdr *hdr;
u16 fc, stype;
int valid = 1;
u8 *decrypted = NULL;
size_t dlen;
if (len < 24)
return;
hdr = (const struct ieee80211_hdr *) data;
fc = le_to_host16(hdr->frame_control);
wt->rx_mgmt++;
stype = WLAN_FC_GET_STYPE(fc);
if ((hdr->addr1[0] & 0x01) &&
(stype == WLAN_FC_STYPE_DEAUTH ||
stype == WLAN_FC_STYPE_DISASSOC ||
stype == WLAN_FC_STYPE_ACTION)) {
if (check_bip(wt, data, len) < 0)
valid = 0;
}
wpa_printf((stype == WLAN_FC_STYPE_BEACON ||
stype == WLAN_FC_STYPE_PROBE_RESP ||
stype == WLAN_FC_STYPE_PROBE_REQ) ?
MSG_EXCESSIVE : MSG_MSGDUMP,
"MGMT %s%s%s DA=" MACSTR " SA=" MACSTR " BSSID=" MACSTR,
mgmt_stype(stype),
fc & WLAN_FC_PWRMGT ? " PwrMgt" : "",
fc & WLAN_FC_ISWEP ? " Prot" : "",
MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
MAC2STR(hdr->addr3));
if ((fc & WLAN_FC_ISWEP) &&
!(hdr->addr1[0] & 0x01) &&
(stype == WLAN_FC_STYPE_DEAUTH ||
stype == WLAN_FC_STYPE_DISASSOC ||
stype == WLAN_FC_STYPE_ACTION)) {
decrypted = mgmt_ccmp_decrypt(wt, data, len, &dlen);
if (decrypted) {
write_pcap_decrypted(wt, decrypted, dlen, NULL, 0);
data = decrypted;
len = dlen;
} else
valid = 0;
}
if (!(fc & WLAN_FC_ISWEP) &&
!(hdr->addr1[0] & 0x01) &&
(stype == WLAN_FC_STYPE_DEAUTH ||
stype == WLAN_FC_STYPE_DISASSOC ||
stype == WLAN_FC_STYPE_ACTION)) {
if (check_mgmt_ccmp(wt, data, len) < 0)
valid = 0;
}
switch (stype) {
case WLAN_FC_STYPE_BEACON:
rx_mgmt_beacon(wt, data, len);
break;
case WLAN_FC_STYPE_PROBE_RESP:
rx_mgmt_probe_resp(wt, data, len);
break;
case WLAN_FC_STYPE_AUTH:
rx_mgmt_auth(wt, data, len);
break;
case WLAN_FC_STYPE_DEAUTH:
rx_mgmt_deauth(wt, data, len, valid);
break;
case WLAN_FC_STYPE_ASSOC_REQ:
rx_mgmt_assoc_req(wt, data, len);
break;
case WLAN_FC_STYPE_ASSOC_RESP:
rx_mgmt_assoc_resp(wt, data, len);
break;
case WLAN_FC_STYPE_REASSOC_REQ:
rx_mgmt_reassoc_req(wt, data, len);
break;
case WLAN_FC_STYPE_REASSOC_RESP:
rx_mgmt_reassoc_resp(wt, data, len);
break;
case WLAN_FC_STYPE_DISASSOC:
rx_mgmt_disassoc(wt, data, len, valid);
break;
case WLAN_FC_STYPE_ACTION:
rx_mgmt_action(wt, data, len, valid);
break;
}
os_free(decrypted);
wt->last_mgmt_valid = valid;
}
static void rx_mgmt_deauth_ack(struct wlantest *wt,
const struct ieee80211_hdr *hdr)
{
const struct ieee80211_mgmt *mgmt;
struct wlantest_bss *bss;
struct wlantest_sta *sta;
mgmt = (const struct ieee80211_mgmt *) hdr;
bss = bss_get(wt, mgmt->bssid);
if (bss == NULL)
return;
if (os_memcmp(mgmt->sa, mgmt->bssid, ETH_ALEN) == 0)
sta = sta_get(bss, mgmt->da);
else
sta = sta_get(bss, mgmt->sa);
if (sta == NULL)
return;
add_note(wt, MSG_DEBUG, "DEAUTH from " MACSTR " acknowledged by "
MACSTR, MAC2STR(mgmt->sa), MAC2STR(mgmt->da));
if (os_memcmp(mgmt->sa, mgmt->bssid, ETH_ALEN) == 0) {
int c;
c = wt->last_mgmt_valid ?
WLANTEST_STA_COUNTER_VALID_DEAUTH_RX_ACK :
WLANTEST_STA_COUNTER_INVALID_DEAUTH_RX_ACK;
sta->counters[c]++;
}
}
static void rx_mgmt_disassoc_ack(struct wlantest *wt,
const struct ieee80211_hdr *hdr)
{
const struct ieee80211_mgmt *mgmt;
struct wlantest_bss *bss;
struct wlantest_sta *sta;
mgmt = (const struct ieee80211_mgmt *) hdr;
bss = bss_get(wt, mgmt->bssid);
if (bss == NULL)
return;
if (os_memcmp(mgmt->sa, mgmt->bssid, ETH_ALEN) == 0)
sta = sta_get(bss, mgmt->da);
else
sta = sta_get(bss, mgmt->sa);
if (sta == NULL)
return;
add_note(wt, MSG_DEBUG, "DISASSOC from " MACSTR " acknowledged by "
MACSTR, MAC2STR(mgmt->sa), MAC2STR(mgmt->da));
if (os_memcmp(mgmt->sa, mgmt->bssid, ETH_ALEN) == 0) {
int c;
c = wt->last_mgmt_valid ?
WLANTEST_STA_COUNTER_VALID_DISASSOC_RX_ACK :
WLANTEST_STA_COUNTER_INVALID_DISASSOC_RX_ACK;
sta->counters[c]++;
}
}
void rx_mgmt_ack(struct wlantest *wt, const struct ieee80211_hdr *hdr)
{
u16 fc, stype;
fc = le_to_host16(hdr->frame_control);
stype = WLAN_FC_GET_STYPE(fc);
wpa_printf(MSG_MSGDUMP, "MGMT ACK: stype=%u a1=" MACSTR " a2=" MACSTR
" a3=" MACSTR,
stype, MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
MAC2STR(hdr->addr3));
switch (stype) {
case WLAN_FC_STYPE_DEAUTH:
rx_mgmt_deauth_ack(wt, hdr);
break;
case WLAN_FC_STYPE_DISASSOC:
rx_mgmt_disassoc_ack(wt, hdr);
break;
}
}
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