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b39f58347d
fragattacks/wlantest/rx_data.c
Jouni Malinen b39f58347d wlantest: Add support for decrypting TDLS frames 
Derive TPK based on TDLS TPK Handshake and decrypt frames on the
direct link with TPK-TK.
2010-12-13 11:20:55 +02:00

433 lines
12 KiB
C
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/*
* Received Data frame processing
* Copyright (c) 2010, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*/
#include "utils/includes.h"
#include <linux/if_ether.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)
{
switch (ethertype) {
case ETH_P_PAE:
rx_data_eapol(wt, dst, src, data, len, prot);
break;
case ETH_P_IP:
rx_data_ip(wt, bssid, sta_addr, dst, src, data, len);
break;
case 0x890d:
rx_data_80211_encap(wt, bssid, sta_addr, dst, src, data, len);
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)
{
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);
return;
}
wpa_hexdump(MSG_DEBUG, "Unrecognized LLC", data, len > 8 ? 8 : len);
}
static void rx_data_bss_prot_group(struct wlantest *wt,
const struct ieee80211_hdr *hdr,
const u8 *qos, const u8 *dst, const u8 *src,
const u8 *data, size_t len)
{
struct wlantest_bss *bss;
int keyid;
u8 *decrypted;
size_t dlen;
u8 pn[6];
bss = bss_get(wt, hdr->addr2);
if (bss == NULL)
return;
if (len < 4) {
wpa_printf(MSG_INFO, "Too short group addressed data frame");
return;
}
if (bss->group_cipher & (WPA_CIPHER_TKIP | WPA_CIPHER_CCMP) &&
!(data[3] & 0x20)) {
wpa_printf(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) {
wpa_printf(MSG_INFO, "TKIP frame from " MACSTR " used "
"non-zero reserved bit",
MAC2STR(bss->bssid));
}
if (data[1] != ((data[0] | 0x20) & 0x7f)) {
wpa_printf(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) {
wpa_printf(MSG_INFO, "CCMP frame from " MACSTR " used "
"non-zero reserved bit",
MAC2STR(bss->bssid));
}
}
keyid = data[3] >> 6;
if (bss->gtk_len[keyid] == 0) {
wpa_printf(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
ccmp_get_pn(pn, data);
if (os_memcmp(pn, bss->rsc[keyid], 6) <= 0) {
wpa_printf(MSG_INFO, "CCMP/TKIP replay detected: SA=" MACSTR,
MAC2STR(hdr->addr2));
wpa_hexdump(MSG_INFO, "RX PN", pn, 6);
wpa_hexdump(MSG_INFO, "RSC", bss->rsc[keyid], 6);
}
if (bss->group_cipher == WPA_CIPHER_TKIP)
decrypted = tkip_decrypt(bss->gtk[keyid], hdr, data, len,
&dlen);
else
decrypted = ccmp_decrypt(bss->gtk[keyid], hdr, data, len,
&dlen);
if (decrypted) {
rx_data_process(wt, bss->bssid, NULL, dst, src, decrypted,
dlen, 1);
os_memcpy(bss->rsc[keyid], pn, 6);
write_pcap_decrypted(wt, (const u8 *) hdr, 24 + (qos ? 2 : 0),
decrypted, dlen);
}
os_free(decrypted);
}
static void rx_data_bss_prot(struct wlantest *wt,
const struct ieee80211_hdr *hdr, const u8 *qos,
const u8 *dst, const u8 *src, const u8 *data,
size_t len)
{
struct wlantest_bss *bss;
struct wlantest_sta *sta, *sta2;
int keyid;
u16 fc = le_to_host16(hdr->frame_control);
u8 *decrypted;
size_t dlen;
int tid;
u8 pn[6], *rsc;
struct wlantest_tdls *tdls = NULL;
const u8 *tk = NULL;
if (hdr->addr1[0] & 0x01) {
rx_data_bss_prot_group(wt, hdr, qos, dst, src, data, len);
return;
}
if (fc & WLAN_FC_TODS) {
bss = bss_get(wt, hdr->addr1);
if (bss == NULL)
return;
sta = sta_get(bss, hdr->addr2);
} 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;
dl_list_for_each(tdls, &bss->tdls, struct wlantest_tdls, list)
{
if ((tdls->init == sta && tdls->resp == sta2) ||
(tdls->init == sta2 && tdls->resp == sta)) {
if (!tdls->link_up)
wpa_printf(MSG_DEBUG, "TDLS: Link not "
"up, but Data frame seen");
tk = tdls->tpk.tk;
break;
}
}
}
if ((sta == NULL || !sta->ptk_set) && tk == NULL) {
wpa_printf(MSG_MSGDUMP, "No PTK known to decrypt the frame");
return;
}
if (len < 4) {
wpa_printf(MSG_INFO, "Too short encrypted data frame");
return;
}
if (sta->pairwise_cipher & (WPA_CIPHER_TKIP | WPA_CIPHER_CCMP) &&
!(data[3] & 0x20)) {
wpa_printf(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) {
wpa_printf(MSG_INFO, "TKIP frame from " MACSTR " used "
"non-zero reserved bit",
MAC2STR(hdr->addr2));
}
if (data[1] != ((data[0] | 0x20) & 0x7f)) {
wpa_printf(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) {
wpa_printf(MSG_INFO, "CCMP frame from " MACSTR " used "
"non-zero reserved bit",
MAC2STR(hdr->addr2));
}
}
keyid = data[3] >> 6;
if (keyid != 0) {
wpa_printf(MSG_INFO, "Unexpected non-zero KeyID %d in "
"individually addressed Data frame from " MACSTR,
keyid, MAC2STR(hdr->addr2));
}
if (qos)
tid = qos[0] & 0x0f;
else
tid = 0;
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)
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
ccmp_get_pn(pn, data);
if (os_memcmp(pn, rsc, 6) <= 0) {
wpa_printf(MSG_INFO, "CCMP/TKIP replay detected: SA=" MACSTR,
MAC2STR(hdr->addr2));
wpa_hexdump(MSG_INFO, "RX PN", pn, 6);
wpa_hexdump(MSG_INFO, "RSC", rsc, 6);
}
if (tk)
decrypted = ccmp_decrypt(tk, hdr, data, len, &dlen);
else if (sta->pairwise_cipher == WPA_CIPHER_TKIP)
decrypted = tkip_decrypt(sta->ptk.tk1, hdr, data, len, &dlen);
else
decrypted = ccmp_decrypt(sta->ptk.tk1, hdr, data, len, &dlen);
if (decrypted) {
rx_data_process(wt, bss->bssid, sta->addr, dst, src, decrypted,
dlen, 1);
os_memcpy(rsc, pn, 6);
write_pcap_decrypted(wt, (const u8 *) hdr, 24 + (qos ? 2 : 0),
decrypted, dlen);
}
os_free(decrypted);
}
static void rx_data_bss(struct wlantest *wt, const struct ieee80211_hdr *hdr,
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, qos, dst, src, data, len);
else {
const u8 *bssid, *sta_addr;
if (fc & WLAN_FC_TODS) {
bssid = hdr->addr1;
sta_addr = hdr->addr2;
} else {
bssid = hdr->addr2;
sta_addr = hdr->addr1;
}
rx_data_process(wt, bssid, sta_addr, dst, src, data, len, 0);
}
}
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));
rx_data_bss(wt, hdr, 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));
rx_data_bss(wt, hdr, qos, hdr->addr1, hdr->addr2,
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));
rx_data_bss(wt, hdr, 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)));
break;
}
}
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