880 lines
24 KiB
C
880 lines
24 KiB
C
/*
|
|
* Received Data 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 "wlantest.h"
|
|
|
|
|
|
static const char * data_stype(u16 stype)
|
|
{
|
|
switch (stype) {
|
|
case WLAN_FC_STYPE_DATA:
|
|
return "DATA";
|
|
case WLAN_FC_STYPE_DATA_CFACK:
|
|
return "DATA-CFACK";
|
|
case WLAN_FC_STYPE_DATA_CFPOLL:
|
|
return "DATA-CFPOLL";
|
|
case WLAN_FC_STYPE_DATA_CFACKPOLL:
|
|
return "DATA-CFACKPOLL";
|
|
case WLAN_FC_STYPE_NULLFUNC:
|
|
return "NULLFUNC";
|
|
case WLAN_FC_STYPE_CFACK:
|
|
return "CFACK";
|
|
case WLAN_FC_STYPE_CFPOLL:
|
|
return "CFPOLL";
|
|
case WLAN_FC_STYPE_CFACKPOLL:
|
|
return "CFACKPOLL";
|
|
case WLAN_FC_STYPE_QOS_DATA:
|
|
return "QOSDATA";
|
|
case WLAN_FC_STYPE_QOS_DATA_CFACK:
|
|
return "QOSDATA-CFACK";
|
|
case WLAN_FC_STYPE_QOS_DATA_CFPOLL:
|
|
return "QOSDATA-CFPOLL";
|
|
case WLAN_FC_STYPE_QOS_DATA_CFACKPOLL:
|
|
return "QOSDATA-CFACKPOLL";
|
|
case WLAN_FC_STYPE_QOS_NULL:
|
|
return "QOS-NULL";
|
|
case WLAN_FC_STYPE_QOS_CFPOLL:
|
|
return "QOS-CFPOLL";
|
|
case WLAN_FC_STYPE_QOS_CFACKPOLL:
|
|
return "QOS-CFACKPOLL";
|
|
}
|
|
return "??";
|
|
}
|
|
|
|
|
|
static void rx_data_eth(struct wlantest *wt, const u8 *bssid,
|
|
const u8 *sta_addr, const u8 *dst, const u8 *src,
|
|
u16 ethertype, const u8 *data, size_t len, int prot,
|
|
const u8 *peer_addr);
|
|
|
|
static void rx_data_vlan(struct wlantest *wt, const u8 *bssid,
|
|
const u8 *sta_addr, const u8 *dst, const u8 *src,
|
|
const u8 *data, size_t len, int prot,
|
|
const u8 *peer_addr)
|
|
{
|
|
u16 tag;
|
|
|
|
if (len < 4)
|
|
return;
|
|
tag = WPA_GET_BE16(data);
|
|
wpa_printf(MSG_MSGDUMP, "VLAN tag: Priority=%u ID=%u",
|
|
tag >> 12, tag & 0x0ffff);
|
|
/* ignore VLAN information and process the original frame */
|
|
rx_data_eth(wt, bssid, sta_addr, dst, src, WPA_GET_BE16(data + 2),
|
|
data + 4, len - 4, prot, peer_addr);
|
|
}
|
|
|
|
|
|
static void rx_data_eth(struct wlantest *wt, const u8 *bssid,
|
|
const u8 *sta_addr, const u8 *dst, const u8 *src,
|
|
u16 ethertype, const u8 *data, size_t len, int prot,
|
|
const u8 *peer_addr)
|
|
{
|
|
switch (ethertype) {
|
|
case ETH_P_PAE:
|
|
rx_data_eapol(wt, bssid, sta_addr, dst, src, data, len, prot);
|
|
break;
|
|
case ETH_P_IP:
|
|
rx_data_ip(wt, bssid, sta_addr, dst, src, data, len,
|
|
peer_addr);
|
|
break;
|
|
case 0x890d:
|
|
rx_data_80211_encap(wt, bssid, sta_addr, dst, src, data, len);
|
|
break;
|
|
case ETH_P_8021Q:
|
|
rx_data_vlan(wt, bssid, sta_addr, dst, src, data, len, prot,
|
|
peer_addr);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
static void rx_data_process(struct wlantest *wt, const u8 *bssid,
|
|
const u8 *sta_addr,
|
|
const u8 *dst, const u8 *src,
|
|
const u8 *data, size_t len, int prot,
|
|
const u8 *peer_addr)
|
|
{
|
|
if (len == 0)
|
|
return;
|
|
|
|
if (len >= 8 && os_memcmp(data, "\xaa\xaa\x03\x00\x00\x00", 6) == 0) {
|
|
rx_data_eth(wt, bssid, sta_addr, dst, src,
|
|
WPA_GET_BE16(data + 6), data + 8, len - 8, prot,
|
|
peer_addr);
|
|
return;
|
|
}
|
|
|
|
wpa_hexdump(MSG_DEBUG, "Unrecognized LLC", data, len > 8 ? 8 : len);
|
|
}
|
|
|
|
|
|
static void write_decrypted_note(struct wlantest *wt, const u8 *decrypted,
|
|
const u8 *tk, size_t tk_len, int keyid)
|
|
{
|
|
char tk_hex[65];
|
|
|
|
if (!decrypted)
|
|
return;
|
|
|
|
wpa_snprintf_hex(tk_hex, sizeof(tk_hex), tk, tk_len);
|
|
add_note(wt, MSG_EXCESSIVE, "TK[%d] %s", keyid, tk_hex);
|
|
}
|
|
|
|
|
|
static u8 * try_ptk(int pairwise_cipher, struct wpa_ptk *ptk,
|
|
const struct ieee80211_hdr *hdr,
|
|
const u8 *data, size_t data_len, size_t *decrypted_len)
|
|
{
|
|
u8 *decrypted;
|
|
unsigned int tk_len = ptk->tk_len;
|
|
|
|
decrypted = NULL;
|
|
if ((pairwise_cipher == WPA_CIPHER_CCMP ||
|
|
pairwise_cipher == 0) && tk_len == 16) {
|
|
decrypted = ccmp_decrypt(ptk->tk, hdr, data,
|
|
data_len, decrypted_len);
|
|
} else if ((pairwise_cipher == WPA_CIPHER_CCMP_256 ||
|
|
pairwise_cipher == 0) && tk_len == 32) {
|
|
decrypted = ccmp_256_decrypt(ptk->tk, hdr, data,
|
|
data_len, decrypted_len);
|
|
} else if ((pairwise_cipher == WPA_CIPHER_GCMP ||
|
|
pairwise_cipher == WPA_CIPHER_GCMP_256 ||
|
|
pairwise_cipher == 0) &&
|
|
(tk_len == 16 || tk_len == 32)) {
|
|
decrypted = gcmp_decrypt(ptk->tk, tk_len, hdr,
|
|
data, data_len, decrypted_len);
|
|
} else if ((pairwise_cipher == WPA_CIPHER_TKIP ||
|
|
pairwise_cipher == 0) && tk_len == 32) {
|
|
decrypted = tkip_decrypt(ptk->tk, hdr, data, data_len,
|
|
decrypted_len);
|
|
}
|
|
|
|
return decrypted;
|
|
}
|
|
|
|
|
|
static u8 * try_all_ptk(struct wlantest *wt, int pairwise_cipher,
|
|
const struct ieee80211_hdr *hdr, int keyid,
|
|
const u8 *data, size_t data_len, size_t *decrypted_len)
|
|
{
|
|
struct wlantest_ptk *ptk;
|
|
u8 *decrypted;
|
|
int prev_level = wpa_debug_level;
|
|
|
|
wpa_debug_level = MSG_WARNING;
|
|
dl_list_for_each(ptk, &wt->ptk, struct wlantest_ptk, list) {
|
|
decrypted = try_ptk(pairwise_cipher, &ptk->ptk, hdr,
|
|
data, data_len, decrypted_len);
|
|
if (decrypted) {
|
|
wpa_debug_level = prev_level;
|
|
add_note(wt, MSG_DEBUG,
|
|
"Found PTK match from list of all known PTKs");
|
|
write_decrypted_note(wt, decrypted, ptk->ptk.tk,
|
|
ptk->ptk.tk_len, keyid);
|
|
return decrypted;
|
|
}
|
|
}
|
|
wpa_debug_level = prev_level;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
|
|
static void check_plaintext_prot(struct wlantest *wt,
|
|
const struct ieee80211_hdr *hdr,
|
|
const u8 *data, size_t len)
|
|
{
|
|
if (len < 8 + 3 || data[8] != 0xaa || data[9] != 0xaa ||
|
|
data[10] != 0x03)
|
|
return;
|
|
|
|
add_note(wt, MSG_DEBUG,
|
|
"Plaintext payload in protected frame");
|
|
wpa_printf(MSG_INFO, "Plaintext payload in protected frame #%u: A2="
|
|
MACSTR " seq=%u",
|
|
wt->frame_num, MAC2STR(hdr->addr2),
|
|
WLAN_GET_SEQ_SEQ(le_to_host16(hdr->seq_ctrl)));
|
|
}
|
|
|
|
|
|
static void rx_data_bss_prot_group(struct wlantest *wt,
|
|
const struct ieee80211_hdr *hdr,
|
|
size_t hdrlen,
|
|
const u8 *qos, const u8 *dst, const u8 *src,
|
|
const u8 *data, size_t len)
|
|
{
|
|
struct wlantest_bss *bss;
|
|
int keyid;
|
|
u8 *decrypted = NULL;
|
|
size_t dlen;
|
|
u8 pn[6];
|
|
int replay = 0;
|
|
|
|
bss = bss_get(wt, hdr->addr2);
|
|
if (bss == NULL)
|
|
return;
|
|
if (len < 4) {
|
|
add_note(wt, MSG_INFO, "Too short group addressed data frame");
|
|
return;
|
|
}
|
|
|
|
if (bss->group_cipher & (WPA_CIPHER_TKIP | WPA_CIPHER_CCMP) &&
|
|
!(data[3] & 0x20)) {
|
|
add_note(wt, MSG_INFO, "Expected TKIP/CCMP frame from "
|
|
MACSTR " did not have ExtIV bit set to 1",
|
|
MAC2STR(bss->bssid));
|
|
return;
|
|
}
|
|
|
|
if (bss->group_cipher == WPA_CIPHER_TKIP) {
|
|
if (data[3] & 0x1f) {
|
|
add_note(wt, MSG_INFO, "TKIP frame from " MACSTR
|
|
" used non-zero reserved bit",
|
|
MAC2STR(bss->bssid));
|
|
}
|
|
if (data[1] != ((data[0] | 0x20) & 0x7f)) {
|
|
add_note(wt, MSG_INFO, "TKIP frame from " MACSTR
|
|
" used incorrect WEPSeed[1] (was 0x%x, "
|
|
"expected 0x%x)",
|
|
MAC2STR(bss->bssid), data[1],
|
|
(data[0] | 0x20) & 0x7f);
|
|
}
|
|
} else if (bss->group_cipher == WPA_CIPHER_CCMP) {
|
|
if (data[2] != 0 || (data[3] & 0x1f) != 0) {
|
|
add_note(wt, MSG_INFO, "CCMP frame from " MACSTR
|
|
" used non-zero reserved bit",
|
|
MAC2STR(bss->bssid));
|
|
}
|
|
}
|
|
|
|
check_plaintext_prot(wt, hdr, data, len);
|
|
keyid = data[3] >> 6;
|
|
if (bss->gtk_len[keyid] == 0 &&
|
|
(bss->group_cipher != WPA_CIPHER_WEP40 ||
|
|
dl_list_empty(&wt->wep))) {
|
|
add_note(wt, MSG_MSGDUMP, "No GTK known to decrypt the frame "
|
|
"(A2=" MACSTR " KeyID=%d)",
|
|
MAC2STR(hdr->addr2), keyid);
|
|
return;
|
|
}
|
|
|
|
if (bss->group_cipher == WPA_CIPHER_TKIP)
|
|
tkip_get_pn(pn, data);
|
|
else if (bss->group_cipher == WPA_CIPHER_WEP40)
|
|
goto skip_replay_det;
|
|
else
|
|
ccmp_get_pn(pn, data);
|
|
if (os_memcmp(pn, bss->rsc[keyid], 6) <= 0) {
|
|
u16 seq_ctrl = le_to_host16(hdr->seq_ctrl);
|
|
char pn_hex[6 * 2 + 1], rsc_hex[6 * 2 + 1];
|
|
|
|
wpa_snprintf_hex(pn_hex, sizeof(pn_hex), pn, 6);
|
|
wpa_snprintf_hex(rsc_hex, sizeof(rsc_hex), bss->rsc[keyid], 6);
|
|
add_note(wt, MSG_INFO, "replay detected: A1=" MACSTR
|
|
" A2=" MACSTR " A3=" MACSTR
|
|
" seq=%u frag=%u%s keyid=%d #%u %s<=%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" : "",
|
|
keyid, wt->frame_num, pn_hex, rsc_hex);
|
|
replay = 1;
|
|
}
|
|
|
|
skip_replay_det:
|
|
if (bss->group_cipher == WPA_CIPHER_TKIP)
|
|
decrypted = tkip_decrypt(bss->gtk[keyid], hdr, data, len,
|
|
&dlen);
|
|
else if (bss->group_cipher == WPA_CIPHER_WEP40)
|
|
decrypted = wep_decrypt(wt, hdr, data, len, &dlen);
|
|
else if (bss->group_cipher == WPA_CIPHER_CCMP)
|
|
decrypted = ccmp_decrypt(bss->gtk[keyid], hdr, data, len,
|
|
&dlen);
|
|
else if (bss->group_cipher == WPA_CIPHER_CCMP_256)
|
|
decrypted = ccmp_256_decrypt(bss->gtk[keyid], hdr, data, len,
|
|
&dlen);
|
|
else if (bss->group_cipher == WPA_CIPHER_GCMP ||
|
|
bss->group_cipher == WPA_CIPHER_GCMP_256)
|
|
decrypted = gcmp_decrypt(bss->gtk[keyid], bss->gtk_len[keyid],
|
|
hdr, data, len, &dlen);
|
|
|
|
if (decrypted) {
|
|
char gtk[65];
|
|
|
|
wpa_snprintf_hex(gtk, sizeof(gtk), bss->gtk[keyid],
|
|
bss->gtk_len[keyid]);
|
|
add_note(wt, MSG_EXCESSIVE, "GTK[%d] %s", keyid, gtk);
|
|
rx_data_process(wt, bss->bssid, NULL, dst, src, decrypted,
|
|
dlen, 1, NULL);
|
|
if (!replay)
|
|
os_memcpy(bss->rsc[keyid], pn, 6);
|
|
write_pcap_decrypted(wt, (const u8 *) hdr, hdrlen,
|
|
decrypted, dlen);
|
|
} else {
|
|
wpa_printf(MSG_DEBUG, "Failed to decrypt frame (group) #%u A2="
|
|
MACSTR " seq=%u",
|
|
wt->frame_num, MAC2STR(hdr->addr2),
|
|
WLAN_GET_SEQ_SEQ(le_to_host16(hdr->seq_ctrl)));
|
|
add_note(wt, MSG_DEBUG, "Failed to decrypt frame (group)");
|
|
}
|
|
os_free(decrypted);
|
|
}
|
|
|
|
|
|
static u8 * try_ptk_decrypt(struct wlantest *wt, struct wlantest_sta *sta,
|
|
const struct ieee80211_hdr *hdr, int keyid,
|
|
const u8 *data, size_t len,
|
|
const u8 *tk, size_t tk_len, size_t *dlen)
|
|
{
|
|
u8 *decrypted = NULL;
|
|
|
|
if (sta->pairwise_cipher == WPA_CIPHER_CCMP_256)
|
|
decrypted = ccmp_256_decrypt(tk, hdr, data, len, dlen);
|
|
else if (sta->pairwise_cipher == WPA_CIPHER_GCMP ||
|
|
sta->pairwise_cipher == WPA_CIPHER_GCMP_256)
|
|
decrypted = gcmp_decrypt(tk, tk_len, hdr, data, len, dlen);
|
|
else
|
|
decrypted = ccmp_decrypt(tk, hdr, data, len, dlen);
|
|
write_decrypted_note(wt, decrypted, tk, tk_len, keyid);
|
|
|
|
return decrypted;
|
|
}
|
|
|
|
|
|
static void rx_data_bss_prot(struct wlantest *wt,
|
|
const struct ieee80211_hdr *hdr, size_t hdrlen,
|
|
const u8 *qos, const u8 *dst, const u8 *src,
|
|
const u8 *data, size_t len)
|
|
{
|
|
struct wlantest_bss *bss, *bss2;
|
|
struct wlantest_sta *sta, *sta2;
|
|
int keyid;
|
|
u16 fc = le_to_host16(hdr->frame_control);
|
|
u8 *decrypted = NULL;
|
|
size_t dlen;
|
|
int tid;
|
|
u8 pn[6], *rsc = NULL;
|
|
struct wlantest_tdls *tdls = NULL, *found;
|
|
const u8 *tk = NULL;
|
|
int ptk_iter_done = 0;
|
|
int try_ptk_iter = 0;
|
|
int replay = 0;
|
|
int only_zero_tk = 0;
|
|
u16 seq_ctrl = le_to_host16(hdr->seq_ctrl);
|
|
|
|
if (hdr->addr1[0] & 0x01) {
|
|
rx_data_bss_prot_group(wt, hdr, hdrlen, qos, dst, src,
|
|
data, len);
|
|
return;
|
|
}
|
|
|
|
if ((fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
|
|
(WLAN_FC_TODS | WLAN_FC_FROMDS)) {
|
|
bss = bss_find(wt, hdr->addr1);
|
|
if (bss) {
|
|
sta = sta_find(bss, hdr->addr2);
|
|
if (sta) {
|
|
sta->counters[
|
|
WLANTEST_STA_COUNTER_PROT_DATA_TX]++;
|
|
}
|
|
if (!sta || !sta->ptk_set) {
|
|
bss2 = bss_find(wt, hdr->addr2);
|
|
if (bss2) {
|
|
sta2 = sta_find(bss2, hdr->addr1);
|
|
if (sta2 && (!sta || sta2->ptk_set)) {
|
|
bss = bss2;
|
|
sta = sta2;
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
bss = bss_find(wt, hdr->addr2);
|
|
if (!bss)
|
|
return;
|
|
sta = sta_find(bss, hdr->addr1);
|
|
}
|
|
} else if (fc & WLAN_FC_TODS) {
|
|
bss = bss_get(wt, hdr->addr1);
|
|
if (bss == NULL)
|
|
return;
|
|
sta = sta_get(bss, hdr->addr2);
|
|
if (sta)
|
|
sta->counters[WLANTEST_STA_COUNTER_PROT_DATA_TX]++;
|
|
} else if (fc & WLAN_FC_FROMDS) {
|
|
bss = bss_get(wt, hdr->addr2);
|
|
if (bss == NULL)
|
|
return;
|
|
sta = sta_get(bss, hdr->addr1);
|
|
} else {
|
|
bss = bss_get(wt, hdr->addr3);
|
|
if (bss == NULL)
|
|
return;
|
|
sta = sta_find(bss, hdr->addr2);
|
|
sta2 = sta_find(bss, hdr->addr1);
|
|
if (sta == NULL || sta2 == NULL)
|
|
return;
|
|
found = NULL;
|
|
dl_list_for_each(tdls, &bss->tdls, struct wlantest_tdls, list)
|
|
{
|
|
if ((tdls->init == sta && tdls->resp == sta2) ||
|
|
(tdls->init == sta2 && tdls->resp == sta)) {
|
|
found = tdls;
|
|
if (tdls->link_up)
|
|
break;
|
|
}
|
|
}
|
|
if (found) {
|
|
if (!found->link_up)
|
|
add_note(wt, MSG_DEBUG,
|
|
"TDLS: Link not up, but Data "
|
|
"frame seen");
|
|
tk = found->tpk.tk;
|
|
tdls = found;
|
|
}
|
|
}
|
|
check_plaintext_prot(wt, hdr, data, len);
|
|
if ((sta == NULL ||
|
|
(!sta->ptk_set && sta->pairwise_cipher != WPA_CIPHER_WEP40)) &&
|
|
tk == NULL) {
|
|
add_note(wt, MSG_MSGDUMP, "No PTK known to decrypt the frame");
|
|
if (dl_list_empty(&wt->ptk)) {
|
|
if (len >= 4 && sta) {
|
|
keyid = data[3] >> 6;
|
|
only_zero_tk = 1;
|
|
goto check_zero_tk;
|
|
}
|
|
return;
|
|
}
|
|
|
|
try_ptk_iter = 1;
|
|
}
|
|
|
|
if (len < 4) {
|
|
add_note(wt, MSG_INFO, "Too short encrypted data frame");
|
|
return;
|
|
}
|
|
|
|
if (sta == NULL)
|
|
return;
|
|
if (sta->pairwise_cipher & (WPA_CIPHER_TKIP | WPA_CIPHER_CCMP) &&
|
|
!(data[3] & 0x20)) {
|
|
add_note(wt, MSG_INFO, "Expected TKIP/CCMP frame from "
|
|
MACSTR " did not have ExtIV bit set to 1",
|
|
MAC2STR(src));
|
|
return;
|
|
}
|
|
|
|
if (tk == NULL && sta->pairwise_cipher == WPA_CIPHER_TKIP) {
|
|
if (data[3] & 0x1f) {
|
|
add_note(wt, MSG_INFO, "TKIP frame from " MACSTR
|
|
" used non-zero reserved bit",
|
|
MAC2STR(hdr->addr2));
|
|
}
|
|
if (data[1] != ((data[0] | 0x20) & 0x7f)) {
|
|
add_note(wt, MSG_INFO, "TKIP frame from " MACSTR
|
|
" used incorrect WEPSeed[1] (was 0x%x, "
|
|
"expected 0x%x)",
|
|
MAC2STR(hdr->addr2), data[1],
|
|
(data[0] | 0x20) & 0x7f);
|
|
}
|
|
} else if (tk || sta->pairwise_cipher == WPA_CIPHER_CCMP) {
|
|
if (data[2] != 0 || (data[3] & 0x1f) != 0) {
|
|
add_note(wt, MSG_INFO, "CCMP frame from " MACSTR
|
|
" used non-zero reserved bit",
|
|
MAC2STR(hdr->addr2));
|
|
}
|
|
}
|
|
|
|
keyid = data[3] >> 6;
|
|
if (keyid != 0 &&
|
|
(!(sta->rsn_capab & WPA_CAPABILITY_EXT_KEY_ID_FOR_UNICAST) ||
|
|
!(bss->rsn_capab & WPA_CAPABILITY_EXT_KEY_ID_FOR_UNICAST) ||
|
|
keyid != 1)) {
|
|
add_note(wt, MSG_INFO,
|
|
"Unexpected KeyID %d in individually addressed Data frame from "
|
|
MACSTR,
|
|
keyid, MAC2STR(hdr->addr2));
|
|
}
|
|
|
|
if (qos) {
|
|
tid = qos[0] & 0x0f;
|
|
if (fc & WLAN_FC_TODS)
|
|
sta->tx_tid[tid]++;
|
|
else
|
|
sta->rx_tid[tid]++;
|
|
} else {
|
|
tid = 0;
|
|
if (fc & WLAN_FC_TODS)
|
|
sta->tx_tid[16]++;
|
|
else
|
|
sta->rx_tid[16]++;
|
|
}
|
|
if (tk) {
|
|
if (os_memcmp(hdr->addr2, tdls->init->addr, ETH_ALEN) == 0)
|
|
rsc = tdls->rsc_init[tid];
|
|
else
|
|
rsc = tdls->rsc_resp[tid];
|
|
} else if ((fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
|
|
(WLAN_FC_TODS | WLAN_FC_FROMDS)) {
|
|
if (os_memcmp(sta->addr, hdr->addr2, ETH_ALEN) == 0)
|
|
rsc = sta->rsc_tods[tid];
|
|
else
|
|
rsc = sta->rsc_fromds[tid];
|
|
} else if (fc & WLAN_FC_TODS)
|
|
rsc = sta->rsc_tods[tid];
|
|
else
|
|
rsc = sta->rsc_fromds[tid];
|
|
|
|
|
|
if (tk == NULL && sta->pairwise_cipher == WPA_CIPHER_TKIP)
|
|
tkip_get_pn(pn, data);
|
|
else if (sta->pairwise_cipher == WPA_CIPHER_WEP40)
|
|
goto skip_replay_det;
|
|
else
|
|
ccmp_get_pn(pn, data);
|
|
if (os_memcmp(pn, rsc, 6) <= 0) {
|
|
char pn_hex[6 * 2 + 1], rsc_hex[6 * 2 + 1];
|
|
|
|
wpa_snprintf_hex(pn_hex, sizeof(pn_hex), pn, 6);
|
|
wpa_snprintf_hex(rsc_hex, sizeof(rsc_hex), rsc, 6);
|
|
add_note(wt, MSG_INFO, "replay detected: A1=" MACSTR
|
|
" A2=" MACSTR " A3=" MACSTR
|
|
" seq=%u frag=%u%s keyid=%d tid=%d #%u %s<=%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" : "",
|
|
keyid, tid, wt->frame_num, pn_hex, rsc_hex);
|
|
replay = 1;
|
|
}
|
|
|
|
skip_replay_det:
|
|
if (tk) {
|
|
if (sta->pairwise_cipher == WPA_CIPHER_CCMP_256) {
|
|
decrypted = ccmp_256_decrypt(tk, hdr, data, len, &dlen);
|
|
write_decrypted_note(wt, decrypted, tk, 32, keyid);
|
|
} else if (sta->pairwise_cipher == WPA_CIPHER_GCMP ||
|
|
sta->pairwise_cipher == WPA_CIPHER_GCMP_256) {
|
|
decrypted = gcmp_decrypt(tk, sta->ptk.tk_len, hdr, data,
|
|
len, &dlen);
|
|
write_decrypted_note(wt, decrypted, tk, sta->ptk.tk_len,
|
|
keyid);
|
|
} else {
|
|
decrypted = ccmp_decrypt(tk, hdr, data, len, &dlen);
|
|
write_decrypted_note(wt, decrypted, tk, 16, keyid);
|
|
}
|
|
} else if (sta->pairwise_cipher == WPA_CIPHER_TKIP) {
|
|
decrypted = tkip_decrypt(sta->ptk.tk, hdr, data, len, &dlen);
|
|
write_decrypted_note(wt, decrypted, sta->ptk.tk, 32, keyid);
|
|
} else if (sta->pairwise_cipher == WPA_CIPHER_WEP40) {
|
|
decrypted = wep_decrypt(wt, hdr, data, len, &dlen);
|
|
} else if (sta->ptk_set) {
|
|
decrypted = try_ptk_decrypt(wt, sta, hdr, keyid, data, len,
|
|
sta->ptk.tk, sta->ptk.tk_len,
|
|
&dlen);
|
|
} else {
|
|
decrypted = try_all_ptk(wt, sta->pairwise_cipher, hdr, keyid,
|
|
data, len, &dlen);
|
|
ptk_iter_done = 1;
|
|
}
|
|
if (!decrypted && !ptk_iter_done) {
|
|
decrypted = try_all_ptk(wt, sta->pairwise_cipher, hdr, keyid,
|
|
data, len, &dlen);
|
|
if (decrypted) {
|
|
add_note(wt, MSG_DEBUG, "Current PTK did not work, but found a match from all known PTKs");
|
|
}
|
|
}
|
|
check_zero_tk:
|
|
if (!decrypted) {
|
|
struct wpa_ptk zero_ptk;
|
|
int old_debug_level = wpa_debug_level;
|
|
|
|
os_memset(&zero_ptk, 0, sizeof(zero_ptk));
|
|
zero_ptk.tk_len = wpa_cipher_key_len(sta->pairwise_cipher);
|
|
wpa_debug_level = MSG_ERROR;
|
|
decrypted = try_ptk(sta->pairwise_cipher, &zero_ptk, hdr,
|
|
data, len, &dlen);
|
|
wpa_debug_level = old_debug_level;
|
|
if (decrypted) {
|
|
add_note(wt, MSG_DEBUG,
|
|
"Frame was encrypted with zero TK");
|
|
wpa_printf(MSG_INFO, "Zero TK used in frame #%u: A2="
|
|
MACSTR " seq=%u",
|
|
wt->frame_num, MAC2STR(hdr->addr2),
|
|
WLAN_GET_SEQ_SEQ(
|
|
le_to_host16(hdr->seq_ctrl)));
|
|
write_decrypted_note(wt, decrypted, zero_ptk.tk,
|
|
zero_ptk.tk_len, keyid);
|
|
}
|
|
}
|
|
if (decrypted) {
|
|
u16 fc = le_to_host16(hdr->frame_control);
|
|
const u8 *peer_addr = NULL;
|
|
if (!(fc & (WLAN_FC_FROMDS | WLAN_FC_TODS)))
|
|
peer_addr = hdr->addr1;
|
|
if (!replay && rsc)
|
|
os_memcpy(rsc, pn, 6);
|
|
rx_data_process(wt, bss->bssid, sta->addr, dst, src, decrypted,
|
|
dlen, 1, peer_addr);
|
|
write_pcap_decrypted(wt, (const u8 *) hdr, hdrlen,
|
|
decrypted, dlen);
|
|
} else if (sta->tptk_set) {
|
|
/* Check whether TPTK has a matching TK that could be used to
|
|
* decrypt the frame. That could happen if EAPOL-Key msg 4/4
|
|
* was missing in the capture and this was PTK rekeying. */
|
|
decrypted = try_ptk_decrypt(wt, sta, hdr, keyid, data, len,
|
|
sta->tptk.tk, sta->tptk.tk_len,
|
|
&dlen);
|
|
if (decrypted) {
|
|
add_note(wt, MSG_DEBUG,
|
|
"Update PTK (rekeying; no valid EAPOL-Key msg 4/4 seen)");
|
|
os_memcpy(&sta->ptk, &sta->tptk, sizeof(sta->ptk));
|
|
sta->ptk_set = 1;
|
|
sta->tptk_set = 0;
|
|
os_memset(sta->rsc_tods, 0, sizeof(sta->rsc_tods));
|
|
os_memset(sta->rsc_fromds, 0, sizeof(sta->rsc_fromds));
|
|
}
|
|
} else {
|
|
if (!try_ptk_iter && !only_zero_tk) {
|
|
wpa_printf(MSG_DEBUG,
|
|
"Failed to decrypt frame #%u A2=" MACSTR
|
|
" seq=%u",
|
|
wt->frame_num, MAC2STR(hdr->addr2),
|
|
WLAN_GET_SEQ_SEQ(seq_ctrl));
|
|
add_note(wt, MSG_DEBUG, "Failed to decrypt frame");
|
|
}
|
|
|
|
/* 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);
|
|
}
|
|
|
|
|
|
static void rx_data_bss(struct wlantest *wt, const struct ieee80211_hdr *hdr,
|
|
size_t hdrlen, const u8 *qos, const u8 *dst,
|
|
const u8 *src, const u8 *data, size_t len)
|
|
{
|
|
u16 fc = le_to_host16(hdr->frame_control);
|
|
int prot = !!(fc & WLAN_FC_ISWEP);
|
|
|
|
if (qos) {
|
|
u8 ack = (qos[0] & 0x60) >> 5;
|
|
wpa_printf(MSG_MSGDUMP, "BSS DATA: " MACSTR " -> " MACSTR
|
|
" len=%u%s tid=%u%s%s",
|
|
MAC2STR(src), MAC2STR(dst), (unsigned int) len,
|
|
prot ? " Prot" : "", qos[0] & 0x0f,
|
|
(qos[0] & 0x10) ? " EOSP" : "",
|
|
ack == 0 ? "" :
|
|
(ack == 1 ? " NoAck" :
|
|
(ack == 2 ? " NoExpAck" : " BA")));
|
|
} else {
|
|
wpa_printf(MSG_MSGDUMP, "BSS DATA: " MACSTR " -> " MACSTR
|
|
" len=%u%s",
|
|
MAC2STR(src), MAC2STR(dst), (unsigned int) len,
|
|
prot ? " Prot" : "");
|
|
}
|
|
|
|
if (prot)
|
|
rx_data_bss_prot(wt, hdr, hdrlen, qos, dst, src, data, len);
|
|
else {
|
|
const u8 *bssid, *sta_addr, *peer_addr;
|
|
struct wlantest_bss *bss;
|
|
|
|
if (fc & WLAN_FC_TODS) {
|
|
bssid = hdr->addr1;
|
|
sta_addr = hdr->addr2;
|
|
peer_addr = NULL;
|
|
} else if (fc & WLAN_FC_FROMDS) {
|
|
bssid = hdr->addr2;
|
|
sta_addr = hdr->addr1;
|
|
peer_addr = NULL;
|
|
} else {
|
|
bssid = hdr->addr3;
|
|
sta_addr = hdr->addr2;
|
|
peer_addr = hdr->addr1;
|
|
}
|
|
|
|
bss = bss_get(wt, bssid);
|
|
if (bss) {
|
|
struct wlantest_sta *sta = sta_get(bss, sta_addr);
|
|
|
|
if (sta) {
|
|
if (qos) {
|
|
int tid = qos[0] & 0x0f;
|
|
if (fc & WLAN_FC_TODS)
|
|
sta->tx_tid[tid]++;
|
|
else
|
|
sta->rx_tid[tid]++;
|
|
} else {
|
|
if (fc & WLAN_FC_TODS)
|
|
sta->tx_tid[16]++;
|
|
else
|
|
sta->rx_tid[16]++;
|
|
}
|
|
}
|
|
}
|
|
|
|
rx_data_process(wt, bssid, sta_addr, dst, src, data, len, 0,
|
|
peer_addr);
|
|
}
|
|
}
|
|
|
|
|
|
static struct wlantest_tdls * get_tdls(struct wlantest *wt, const u8 *bssid,
|
|
const u8 *sta1_addr,
|
|
const u8 *sta2_addr)
|
|
{
|
|
struct wlantest_bss *bss;
|
|
struct wlantest_sta *sta1, *sta2;
|
|
struct wlantest_tdls *tdls, *found = NULL;
|
|
|
|
bss = bss_find(wt, bssid);
|
|
if (bss == NULL)
|
|
return NULL;
|
|
sta1 = sta_find(bss, sta1_addr);
|
|
if (sta1 == NULL)
|
|
return NULL;
|
|
sta2 = sta_find(bss, sta2_addr);
|
|
if (sta2 == NULL)
|
|
return NULL;
|
|
|
|
dl_list_for_each(tdls, &bss->tdls, struct wlantest_tdls, list) {
|
|
if ((tdls->init == sta1 && tdls->resp == sta2) ||
|
|
(tdls->init == sta2 && tdls->resp == sta1)) {
|
|
found = tdls;
|
|
if (tdls->link_up)
|
|
break;
|
|
}
|
|
}
|
|
|
|
return found;
|
|
}
|
|
|
|
|
|
static void add_direct_link(struct wlantest *wt, const u8 *bssid,
|
|
const u8 *sta1_addr, const u8 *sta2_addr)
|
|
{
|
|
struct wlantest_tdls *tdls;
|
|
|
|
tdls = get_tdls(wt, bssid, sta1_addr, sta2_addr);
|
|
if (tdls == NULL)
|
|
return;
|
|
|
|
if (tdls->link_up)
|
|
tdls->counters[WLANTEST_TDLS_COUNTER_VALID_DIRECT_LINK]++;
|
|
else
|
|
tdls->counters[WLANTEST_TDLS_COUNTER_INVALID_DIRECT_LINK]++;
|
|
}
|
|
|
|
|
|
static void add_ap_path(struct wlantest *wt, const u8 *bssid,
|
|
const u8 *sta1_addr, const u8 *sta2_addr)
|
|
{
|
|
struct wlantest_tdls *tdls;
|
|
|
|
tdls = get_tdls(wt, bssid, sta1_addr, sta2_addr);
|
|
if (tdls == NULL)
|
|
return;
|
|
|
|
if (tdls->link_up)
|
|
tdls->counters[WLANTEST_TDLS_COUNTER_INVALID_AP_PATH]++;
|
|
else
|
|
tdls->counters[WLANTEST_TDLS_COUNTER_VALID_AP_PATH]++;
|
|
}
|
|
|
|
|
|
void rx_data(struct wlantest *wt, const u8 *data, size_t len)
|
|
{
|
|
const struct ieee80211_hdr *hdr;
|
|
u16 fc, stype;
|
|
size_t hdrlen;
|
|
const u8 *qos = NULL;
|
|
|
|
if (len < 24)
|
|
return;
|
|
|
|
hdr = (const struct ieee80211_hdr *) data;
|
|
fc = le_to_host16(hdr->frame_control);
|
|
stype = WLAN_FC_GET_STYPE(fc);
|
|
hdrlen = 24;
|
|
if ((fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
|
|
(WLAN_FC_TODS | WLAN_FC_FROMDS))
|
|
hdrlen += ETH_ALEN;
|
|
if (stype & 0x08) {
|
|
qos = data + hdrlen;
|
|
hdrlen += 2;
|
|
}
|
|
if (len < hdrlen)
|
|
return;
|
|
wt->rx_data++;
|
|
|
|
switch (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) {
|
|
case 0:
|
|
wpa_printf(MSG_EXCESSIVE, "DATA %s%s%s IBSS DA=" MACSTR " SA="
|
|
MACSTR " BSSID=" MACSTR,
|
|
data_stype(WLAN_FC_GET_STYPE(fc)),
|
|
fc & WLAN_FC_PWRMGT ? " PwrMgt" : "",
|
|
fc & WLAN_FC_ISWEP ? " Prot" : "",
|
|
MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
|
|
MAC2STR(hdr->addr3));
|
|
add_direct_link(wt, hdr->addr3, hdr->addr1, hdr->addr2);
|
|
rx_data_bss(wt, hdr, hdrlen, qos, hdr->addr1, hdr->addr2,
|
|
data + hdrlen, len - hdrlen);
|
|
break;
|
|
case WLAN_FC_FROMDS:
|
|
wpa_printf(MSG_EXCESSIVE, "DATA %s%s%s FromDS DA=" MACSTR
|
|
" BSSID=" MACSTR " SA=" MACSTR,
|
|
data_stype(WLAN_FC_GET_STYPE(fc)),
|
|
fc & WLAN_FC_PWRMGT ? " PwrMgt" : "",
|
|
fc & WLAN_FC_ISWEP ? " Prot" : "",
|
|
MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
|
|
MAC2STR(hdr->addr3));
|
|
add_ap_path(wt, hdr->addr2, hdr->addr1, hdr->addr3);
|
|
rx_data_bss(wt, hdr, hdrlen, qos, hdr->addr1, hdr->addr3,
|
|
data + hdrlen, len - hdrlen);
|
|
break;
|
|
case WLAN_FC_TODS:
|
|
wpa_printf(MSG_EXCESSIVE, "DATA %s%s%s ToDS BSSID=" MACSTR
|
|
" SA=" MACSTR " DA=" MACSTR,
|
|
data_stype(WLAN_FC_GET_STYPE(fc)),
|
|
fc & WLAN_FC_PWRMGT ? " PwrMgt" : "",
|
|
fc & WLAN_FC_ISWEP ? " Prot" : "",
|
|
MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
|
|
MAC2STR(hdr->addr3));
|
|
add_ap_path(wt, hdr->addr1, hdr->addr3, hdr->addr2);
|
|
rx_data_bss(wt, hdr, hdrlen, qos, hdr->addr3, hdr->addr2,
|
|
data + hdrlen, len - hdrlen);
|
|
break;
|
|
case WLAN_FC_TODS | WLAN_FC_FROMDS:
|
|
wpa_printf(MSG_EXCESSIVE, "DATA %s%s%s WDS RA=" MACSTR " TA="
|
|
MACSTR " DA=" MACSTR " SA=" MACSTR,
|
|
data_stype(WLAN_FC_GET_STYPE(fc)),
|
|
fc & WLAN_FC_PWRMGT ? " PwrMgt" : "",
|
|
fc & WLAN_FC_ISWEP ? " Prot" : "",
|
|
MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
|
|
MAC2STR(hdr->addr3),
|
|
MAC2STR((const u8 *) (hdr + 1)));
|
|
rx_data_bss(wt, hdr, hdrlen, qos, hdr->addr1, hdr->addr2,
|
|
data + hdrlen, len - hdrlen);
|
|
break;
|
|
}
|
|
}
|