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hostapd/wlantest/rx_data.c
Jouni Malinen cc046a1ff8 wlantest: Extend protected Data frame checks for GCMP and CCMP-256 
The same rules that apply to CCMP-128 apply also for GCMP-128, CCMP-256,
and GCMP-256 here.

Signed-off-by: Jouni Malinen <quic_jouni@quicinc.com>
2022-08-29 21:31:52 +03:00

932 lines
26 KiB
C
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/*
* 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, struct wlantest_bss *bss,
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, const u8 *qos)
{
if (len == 0)
return;
if (bss && bss->mesh && qos && !(qos[0] & BIT(7)) &&
(qos[1] & BIT(0))) {
u8 addr_ext_mode;
size_t mesh_control_len = 6;
/* Skip Mesh Control field if this is not an A-MSDU */
if (len < mesh_control_len) {
wpa_printf(MSG_DEBUG,
"Not enough room for Mesh Control field");
return;
}
addr_ext_mode = data[0] & 0x03;
if (addr_ext_mode == 3) {
wpa_printf(MSG_DEBUG,
"Reserved Mesh Control :: Address Extension Mode");
return;
}
mesh_control_len += addr_ext_mode * ETH_ALEN;
if (len < mesh_control_len) {
wpa_printf(MSG_DEBUG,
"Not enough room for Mesh Address Extension");
return;
}
len -= mesh_control_len;
data += mesh_control_len;
}
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 u8 * try_ptk(struct wlantest *wt, 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) {
enum michael_mic_result mic_res;
decrypted = tkip_decrypt(ptk->tk, hdr, data, data_len,
decrypted_len, &mic_res,
&wt->tkip_frag);
if (decrypted && mic_res == MICHAEL_MIC_INCORRECT)
add_note(wt, MSG_INFO, "Invalid Michael MIC");
else if (decrypted && mic_res == MICHAEL_MIC_NOT_VERIFIED)
add_note(wt, MSG_DEBUG, "Michael MIC not verified");
}
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(wt, 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))) {
decrypted = try_all_ptk(wt, bss->group_cipher, hdr, keyid,
data, len, &dlen);
if (decrypted)
goto process;
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) {
enum michael_mic_result mic_res;
decrypted = tkip_decrypt(bss->gtk[keyid], hdr, data, len,
&dlen, &mic_res, &wt->tkip_frag);
if (decrypted && mic_res == MICHAEL_MIC_INCORRECT)
add_note(wt, MSG_INFO, "Invalid Michael MIC");
else if (decrypted && mic_res == MICHAEL_MIC_NOT_VERIFIED)
add_note(wt, MSG_DEBUG, "Michael MIC not verified");
} 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);
process:
rx_data_process(wt, bss, bss->bssid, NULL, dst, src, decrypted,
dlen, 1, NULL, qos);
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 |
WPA_CIPHER_GCMP | WPA_CIPHER_GCMP_256 |
WPA_CIPHER_CCMP_256) &&
!(data[3] & 0x20)) {
add_note(wt, MSG_INFO, "Expected TKIP/CCMP/GCMP 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 ||
sta->pairwise_cipher == WPA_CIPHER_GCMP ||
sta->pairwise_cipher == WPA_CIPHER_GCMP_256 ||
sta->pairwise_cipher == WPA_CIPHER_CCMP_256) {
if (data[2] != 0 || (data[3] & 0x1f) != 0) {
add_note(wt, MSG_INFO, "CCMP/GCMP 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) {
enum michael_mic_result mic_res;
decrypted = tkip_decrypt(sta->ptk.tk, hdr, data, len, &dlen,
&mic_res, &wt->tkip_frag);
if (decrypted && mic_res == MICHAEL_MIC_INCORRECT)
add_note(wt, MSG_INFO, "Invalid Michael MIC");
else if (decrypted && mic_res == MICHAEL_MIC_NOT_VERIFIED)
add_note(wt, MSG_DEBUG, "Michael MIC not verified");
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(wt, 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, bss->bssid, sta->addr, dst, src,
decrypted, dlen, 1, peer_addr, qos);
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, bss, bssid, sta_addr, dst, src, data, len,
0, peer_addr, qos);
}
}
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 ((fc & WLAN_FC_HTC) && (stype & 0x08))
hdrlen += 4; /* HT Control field */
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;
}
}
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