Amazing-Mirror/fragattacks
1
0
Fork 0
mirror of https://github.com/vanhoefm/fragattacks.git synced 2024-11-28 10:18:21 -05:00
Code Issues Projects Releases Wiki Activity

wlantest: Add PTK derivation based on passphrases

Browse Source 
Allow pre-configuration of passphrases (-p<passphrase>) to provide
enough information for wlantest to be able to derive PMK for each
BSS and PTK for each STA going through 4-Way Handshake (at least
message 2 and 3 needs to be received).
This commit is contained in:
Jouni Malinen 2010-11-06 22:57:49 +02:00
parent 32234bba52
commit 53650bcab4
6 changed files with 285 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
wlantest/Makefile
View File

@ -40,6 +40,7 @@ OBJS_lib += ../src/utils/libutils.a
OBJS_lib += ../src/crypto/libcrypto.a
OBJS += ../src/common/ieee802_11_common.o
OBJS += ../src/common/wpa_common.o
OBJS += wlantest.o
OBJS += readpcap.o

62
wlantest/bss.c
View File

@ -16,6 +16,7 @@
#include "utils/common.h"
#include "common/ieee802_11_common.h"
#include "crypto/sha1.h"
#include "wlantest.h"
@ -35,6 +36,7 @@ struct wlantest_bss * bss_get(struct wlantest *wt, const u8 *bssid)
if (bss == NULL)
return NULL;
dl_list_init(&bss->sta);
dl_list_init(&bss->pmk);
os_memcpy(bss->bssid, bssid, ETH_ALEN);
dl_list_add(&wt->bss, &bss->list);
wpa_printf(MSG_DEBUG, "Discovered new BSS - " MACSTR,
@ -43,17 +45,63 @@ struct wlantest_bss * bss_get(struct wlantest *wt, const u8 *bssid)
}
static void pmk_deinit(struct wlantest_pmk *pmk)
{
dl_list_del(&pmk->list);
os_free(pmk);
}
void bss_deinit(struct wlantest_bss *bss)
{
struct wlantest_sta *sta, *n;
struct wlantest_pmk *pmk, *np;
dl_list_for_each_safe(sta, n, &bss->sta, struct wlantest_sta, list)
sta_deinit(sta);
dl_list_for_each_safe(pmk, np, &bss->pmk, struct wlantest_pmk, list)
pmk_deinit(pmk);
dl_list_del(&bss->list);
os_free(bss);
}
void bss_update(struct wlantest_bss *bss, struct ieee802_11_elems *elems)
static void bss_add_pmk(struct wlantest *wt, struct wlantest_bss *bss)
{
struct wlantest_passphrase *p;
struct wlantest_pmk *pmk;
dl_list_for_each(p, &wt->passphrase, struct wlantest_passphrase, list)
{
if (!is_zero_ether_addr(p->bssid) &&
os_memcmp(p->bssid, bss->bssid, ETH_ALEN) != 0)
continue;
if (p->ssid_len &&
(p->ssid_len != bss->ssid_len ||
os_memcmp(p->ssid, bss->ssid, p->ssid_len) != 0))
continue;
pmk = os_zalloc(sizeof(*pmk));
if (pmk == NULL)
break;
if (pbkdf2_sha1(p->passphrase, (char *) bss->ssid,
bss->ssid_len, 4096,
pmk->pmk, sizeof(pmk->pmk)) < 0) {
os_free(pmk);
continue;
}
wpa_printf(MSG_INFO, "Add possible PMK for BSSID " MACSTR
" based on passphrase '%s'",
MAC2STR(bss->bssid), p->passphrase);
wpa_hexdump(MSG_DEBUG, "Possible PMK",
pmk->pmk, sizeof(pmk->pmk));
dl_list_add(&bss->pmk, &pmk->list);
}
}
void bss_update(struct wlantest *wt, struct wlantest_bss *bss,
struct ieee802_11_elems *elems)
{
if (elems->ssid == NULL || elems->ssid_len > 32) {
wpa_printf(MSG_INFO, "Invalid or missing SSID in a Beacon "
@ -62,8 +110,16 @@ void bss_update(struct wlantest_bss *bss, struct ieee802_11_elems *elems)
return;
}
os_memcpy(bss->ssid, elems->ssid, elems->ssid_len);
bss->ssid_len = elems->ssid_len;
if (bss->ssid_len != elems->ssid_len ||
os_memcmp(bss->ssid, elems->ssid, bss->ssid_len) != 0) {
wpa_printf(MSG_DEBUG, "Store SSID '%s' for BSSID " MACSTR,
wpa_ssid_txt(elems->ssid, elems->ssid_len),
MAC2STR(bss->bssid));
os_memcpy(bss->ssid, elems->ssid, elems->ssid_len);
bss->ssid_len = elems->ssid_len;
bss_add_pmk(wt, bss);
}
if (elems->rsn_ie == NULL) {
if (bss->rsnie[0]) {

169
wlantest/rx_data.c
View File

@ -59,35 +59,193 @@ static const char * data_stype(u16 stype)
}
static int check_mic(const u8 *kck, int ver, const u8 *data, size_t len)
{
u8 *buf;
int ret = -1;
struct ieee802_1x_hdr *hdr;
struct wpa_eapol_key *key;
u8 rx_mic[16];
buf = os_malloc(len);
if (buf == NULL)
return -1;
os_memcpy(buf, data, len);
hdr = (struct ieee802_1x_hdr *) buf;
key = (struct wpa_eapol_key *) (hdr + 1);
os_memcpy(rx_mic, key->key_mic, 16);
os_memset(key->key_mic, 0, 16);
if (wpa_eapol_key_mic(kck, ver, buf, len, key->key_mic) == 0 &&
os_memcmp(rx_mic, key->key_mic, 16) == 0)
ret = 0;
os_free(buf);
return ret;
}
static void rx_data_eapol_key_1_of_4(struct wlantest *wt, const u8 *dst,
const u8 *src, const u8 *data, size_t len)
{
struct wlantest_bss *bss;
struct wlantest_sta *sta;
const struct ieee802_1x_hdr *eapol;
const struct wpa_eapol_key *hdr;
wpa_printf(MSG_DEBUG, "EAPOL-Key 1/4 " MACSTR " -> " MACSTR,
MAC2STR(src), MAC2STR(dst));
bss = bss_get(wt, src);
if (bss == NULL)
return;
sta = sta_get(bss, dst);
if (sta == NULL)
return;
eapol = (const struct ieee802_1x_hdr *) data;
hdr = (const struct wpa_eapol_key *) (eapol + 1);
os_memcpy(sta->anonce, hdr->key_nonce, WPA_NONCE_LEN);
}
static void derive_ptk(struct wlantest_bss *bss, struct wlantest_sta *sta,
u16 ver, const u8 *data, size_t len)
{
struct wlantest_pmk *pmk;
dl_list_for_each(pmk, &bss->pmk, struct wlantest_pmk, list) {
struct wpa_ptk ptk;
size_t ptk_len = 48; /* FIX: 64 for TKIP */
wpa_pmk_to_ptk(pmk->pmk, sizeof(pmk->pmk),
"Pairwise key expansion",
bss->bssid, sta->addr, sta->anonce, sta->snonce,
(u8 *) &ptk, ptk_len,
0 /* FIX: SHA256 based on AKM */);
if (check_mic(ptk.kck, ver,
data, len) < 0)
continue;
wpa_printf(MSG_INFO, "Derived PTK for STA " MACSTR " BSSID "
MACSTR ")",
MAC2STR(sta->addr), MAC2STR(bss->bssid));
os_memcpy(&sta->ptk, &ptk, sizeof(ptk));
sta->ptk_set = 1;
break;
}
}
static void rx_data_eapol_key_2_of_4(struct wlantest *wt, const u8 *dst,
const u8 *src, const u8 *data, size_t len)
{
struct wlantest_bss *bss;
struct wlantest_sta *sta;
const struct ieee802_1x_hdr *eapol;
const struct wpa_eapol_key *hdr;
u16 key_info;
wpa_printf(MSG_DEBUG, "EAPOL-Key 2/4 " MACSTR " -> " MACSTR,
MAC2STR(src), MAC2STR(dst));
bss = bss_get(wt, dst);
if (bss == NULL)
return;
sta = sta_get(bss, src);
if (sta == NULL)
return;
eapol = (const struct ieee802_1x_hdr *) data;
hdr = (const struct wpa_eapol_key *) (eapol + 1);
os_memcpy(sta->snonce, hdr->key_nonce, WPA_NONCE_LEN);
key_info = WPA_GET_BE16(hdr->key_info);
derive_ptk(bss, sta, key_info & WPA_KEY_INFO_TYPE_MASK, data, len);
}
static void rx_data_eapol_key_3_of_4(struct wlantest *wt, const u8 *dst,
const u8 *src, const u8 *data, size_t len)
{
struct wlantest_bss *bss;
struct wlantest_sta *sta;
const struct ieee802_1x_hdr *eapol;
const struct wpa_eapol_key *hdr;
int recalc = 0;
u16 key_info;
wpa_printf(MSG_DEBUG, "EAPOL-Key 3/4 " MACSTR " -> " MACSTR,
MAC2STR(src), MAC2STR(dst));
bss = bss_get(wt, src);
if (bss == NULL)
return;
sta = sta_get(bss, dst);
if (sta == NULL)
return;
eapol = (const struct ieee802_1x_hdr *) data;
hdr = (const struct wpa_eapol_key *) (eapol + 1);
key_info = WPA_GET_BE16(hdr->key_info);
if (os_memcmp(sta->anonce, hdr->key_nonce, WPA_NONCE_LEN) != 0) {
wpa_printf(MSG_INFO, "EAPOL-Key ANonce mismatch between 1/4 "
"and 3/4");
recalc = 1;
}
os_memcpy(sta->anonce, hdr->key_nonce, WPA_NONCE_LEN);
if (recalc) {
derive_ptk(bss, sta, key_info & WPA_KEY_INFO_TYPE_MASK,
data, len);
}
if (!sta->ptk_set) {
wpa_printf(MSG_DEBUG, "No PTK known to process EAPOL-Key 3/4");
return;
}
if (check_mic(sta->ptk.kck, key_info & WPA_KEY_INFO_TYPE_MASK,
data, len) < 0) {
wpa_printf(MSG_INFO, "Mismatch in EAPOL-Key 3/4 MIC");
return;
}
wpa_printf(MSG_DEBUG, "Valid MIC found in EAPOL-Key 3/4");
/* TODO: decrypt Key Data and store GTK, IGTK */
}
static void rx_data_eapol_key_4_of_4(struct wlantest *wt, const u8 *dst,
const u8 *src, const u8 *data, size_t len)
{
struct wlantest_bss *bss;
struct wlantest_sta *sta;
const struct ieee802_1x_hdr *eapol;
const struct wpa_eapol_key *hdr;
u16 key_info;
wpa_printf(MSG_DEBUG, "EAPOL-Key 4/4 " MACSTR " -> " MACSTR,
MAC2STR(src), MAC2STR(dst));
bss = bss_get(wt, dst);
if (bss == NULL)
return;
sta = sta_get(bss, src);
if (sta == NULL)
return;
eapol = (const struct ieee802_1x_hdr *) data;
hdr = (const struct wpa_eapol_key *) (eapol + 1);
key_info = WPA_GET_BE16(hdr->key_info);
if (!sta->ptk_set) {
wpa_printf(MSG_DEBUG, "No PTK known to process EAPOL-Key 4/4");
return;
}
if (sta->ptk_set &&
check_mic(sta->ptk.kck, key_info & WPA_KEY_INFO_TYPE_MASK,
data, len) < 0) {
wpa_printf(MSG_INFO, "Mismatch in EAPOL-Key 4/4 MIC");
return;
}
wpa_printf(MSG_DEBUG, "Valid MIC found in EAPOL-Key 4/4");
}
@ -111,16 +269,20 @@ static void rx_data_eapol_key(struct wlantest *wt, const u8 *dst,
const u8 *src, const u8 *data, size_t len,
int prot)
{
const struct ieee802_1x_hdr *eapol;
const struct wpa_eapol_key *hdr;
u16 key_info, key_length, ver, key_data_length;
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key", data, len);
eapol = (const struct ieee802_1x_hdr *) data;
hdr = (const struct wpa_eapol_key *) (eapol + 1);
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key",
(const u8 *) hdr, len - sizeof(*eapol));
if (len < sizeof(*hdr)) {
wpa_printf(MSG_INFO, "Too short EAPOL-Key frame from " MACSTR,
MAC2STR(src));
return;
}
hdr = (const struct wpa_eapol_key *) data;
if (hdr->type == EAPOL_KEY_TYPE_RC4) {
/* TODO: EAPOL-Key RC4 for WEP */
@ -264,7 +426,8 @@ static void rx_data_eapol(struct wlantest *wt, const u8 *dst, const u8 *src,
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Logoff", p, length);
break;
case IEEE802_1X_TYPE_EAPOL_KEY:
rx_data_eapol_key(wt, dst, src, p, length, prot);
rx_data_eapol_key(wt, dst, src, data, sizeof(*hdr) + length,
prot);
break;
case IEEE802_1X_TYPE_EAPOL_ENCAPSULATED_ASF_ALERT:
wpa_hexdump(MSG_MSGDUMP, "EAPOL - Encapsulated ASF alert",

4
wlantest/rx_mgmt.c
View File

@ -76,7 +76,7 @@ static void rx_mgmt_beacon(struct wlantest *wt, const u8 *data, size_t len)
return;
}
bss_update(bss, &elems);
bss_update(wt, bss, &elems);
}
@ -103,7 +103,7 @@ static void rx_mgmt_probe_resp(struct wlantest *wt, const u8 *data, size_t len)
return;
}
bss_update(bss, &elems);
bss_update(wt, bss, &elems);
}

37
wlantest/wlantest.c
View File

@ -20,6 +20,7 @@
extern int wpa_debug_level;
extern int wpa_debug_show_keys;
static void wlantest_terminate(int sig, void *signal_ctx)
@ -30,7 +31,15 @@ static void wlantest_terminate(int sig, void *signal_ctx)
static void usage(void)
{
printf("wlantest [-ddhqq] [-i<ifname>] [-r<pcap file>]\n");
printf("wlantest [-ddhqq] [-i<ifname>] [-r<pcap file>] "
"[-p<passphrase>]\n");
}
static void passphrase_deinit(struct wlantest_passphrase *p)
{
dl_list_del(&p->list);
os_free(p);
}
@ -38,6 +47,7 @@ static void wlantest_init(struct wlantest *wt)
{
os_memset(wt, 0, sizeof(*wt));
wt->monitor_sock = -1;
dl_list_init(&wt->passphrase);
dl_list_init(&wt->bss);
}
@ -45,10 +55,29 @@ static void wlantest_init(struct wlantest *wt)
static void wlantest_deinit(struct wlantest *wt)
{
struct wlantest_bss *bss, *n;
struct wlantest_passphrase *p, *pn;
if (wt->monitor_sock >= 0)
monitor_deinit(wt);
dl_list_for_each_safe(bss, n, &wt->bss, struct wlantest_bss, list)
bss_deinit(bss);
dl_list_for_each_safe(p, pn, &wt->passphrase,
struct wlantest_passphrase, list)
passphrase_deinit(p);
}
static void add_passphrase(struct wlantest *wt, const char *passphrase)
{
struct wlantest_passphrase *p;
size_t len = os_strlen(passphrase);
if (len < 8 || len > 63)
return;
p = os_zalloc(sizeof(*p));
if (p == NULL)
return;
os_memcpy(p->passphrase, passphrase, len);
dl_list_add(&wt->passphrase, &p->list);
}
@ -60,6 +89,7 @@ int main(int argc, char *argv[])
struct wlantest wt;
wpa_debug_level = MSG_INFO;
wpa_debug_show_keys = 1;
if (os_program_init())
return -1;
@ -67,7 +97,7 @@ int main(int argc, char *argv[])
wlantest_init(&wt);
for (;;) {
c = getopt(argc, argv, "dhi:r:q");
c = getopt(argc, argv, "dhi:p:qr:");
if (c < 0)
break;
switch (c) {
@ -81,6 +111,9 @@ int main(int argc, char *argv[])
case 'i':
ifname = optarg;
break;
case 'p':
add_passphrase(&wt, optarg);
break;
case 'q':
wpa_debug_level++;
break;

23
wlantest/wlantest.h
View File

@ -16,10 +16,24 @@
#define WLANTEST_H
#include "utils/list.h"
#include "common/wpa_common.h"
struct ieee802_11_elems;
struct wlantest_passphrase {
struct dl_list list;
char passphrase[64];
u8 ssid[32];
size_t ssid_len;
u8 bssid[ETH_ALEN];
};
struct wlantest_pmk {
struct dl_list list;
u8 pmk[32];
};
struct wlantest_sta {
struct dl_list list;
u8 addr[ETH_ALEN];
@ -30,6 +44,10 @@ struct wlantest_sta {
} state;
u16 aid;
u8 rsnie[257]; /* WPA/RSN IE */
u8 anonce[32]; /* ANonce from the previous EAPOL-Key msg 1/4 or 3/4 */
u8 snonce[32]; /* SNonce from the previous EAPOL-Key msg 2/4 */
struct wpa_ptk ptk; /* Derived PTK */
int ptk_set;
};
struct wlantest_bss {
@ -43,11 +61,13 @@ struct wlantest_bss {
u8 wpaie[257];
u8 rsnie[257];
struct dl_list sta; /* struct wlantest_sta */
struct dl_list pmk; /* struct wlantest_pmk */
};
struct wlantest {
int monitor_sock;
struct dl_list passphrase; /* struct wlantest_passphrase */
struct dl_list bss; /* struct wlantest_bss */
unsigned int rx_mgmt;
@ -66,7 +86,8 @@ void rx_data(struct wlantest *wt, const u8 *data, size_t len);
struct wlantest_bss * bss_get(struct wlantest *wt, const u8 *bssid);
void bss_deinit(struct wlantest_bss *bss);
void bss_update(struct wlantest_bss *bss, struct ieee802_11_elems *elems);
void bss_update(struct wlantest *wt, struct wlantest_bss *bss,
struct ieee802_11_elems *elems);
struct wlantest_sta * sta_get(struct wlantest_bss *bss, const u8 *addr);
void sta_deinit(struct wlantest_sta *sta);