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hostapd/wlantest/rx_eapol.c
Jouni Malinen 3fb62bdae9 wlantest: Add support for FT-PSK initial association key derivation 
This adds minimal support for deriving keys for FT-PSK to allow the
initial mobility domain association to be analyzed in more detail.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
2015-08-06 20:47:25 +03:00

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/*
* Received Data frame processing for EAPOL messages
* 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 "crypto/aes_wrap.h"
#include "crypto/crypto.h"
#include "common/defs.h"
#include "common/ieee802_11_defs.h"
#include "common/ieee802_11_common.h"
#include "common/eapol_common.h"
#include "common/wpa_common.h"
#include "rsn_supp/wpa_ie.h"
#include "wlantest.h"
static int is_zero(const u8 *buf, size_t len)
{
size_t i;
for (i = 0; i < len; i++) {
if (buf[i])
return 0;
}
return 1;
}
static int check_mic(const u8 *kck, size_t kck_len, int akmp, 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[WPA_EAPOL_KEY_MIC_MAX_LEN];
size_t mic_len = 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, mic_len);
os_memset(key->key_mic, 0, mic_len);
if (wpa_eapol_key_mic(kck, kck_len, akmp, ver, buf, len,
key->key_mic) == 0 &&
os_memcmp(rx_mic, key->key_mic, mic_len) == 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);
if (is_zero(hdr->key_nonce, WPA_NONCE_LEN)) {
add_note(wt, MSG_INFO, "EAPOL-Key 1/4 from " MACSTR
" used zero nonce", MAC2STR(src));
}
if (!is_zero(hdr->key_rsc, 8)) {
add_note(wt, MSG_INFO, "EAPOL-Key 1/4 from " MACSTR
" used non-zero Key RSC", MAC2STR(src));
}
os_memcpy(sta->anonce, hdr->key_nonce, WPA_NONCE_LEN);
}
static int try_pmk(struct wlantest *wt, struct wlantest_bss *bss,
struct wlantest_sta *sta, u16 ver,
const u8 *data, size_t len,
struct wlantest_pmk *pmk)
{
struct wpa_ptk ptk;
if (wpa_key_mgmt_ft(sta->key_mgmt)) {
u8 pmk_r0[PMK_LEN];
u8 pmk_r0_name[WPA_PMK_NAME_LEN];
u8 pmk_r1[PMK_LEN];
u8 pmk_r1_name[WPA_PMK_NAME_LEN];
u8 ptk_name[WPA_PMK_NAME_LEN];
wpa_derive_pmk_r0(pmk->pmk, sizeof(pmk->pmk),
bss->ssid, bss->ssid_len, bss->mdid,
bss->r0kh_id, bss->r0kh_id_len,
sta->addr, pmk_r0, pmk_r0_name);
wpa_hexdump(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN);
wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name,
WPA_PMK_NAME_LEN);
wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, bss->r1kh_id,
sta->addr, pmk_r1, pmk_r1_name);
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN);
wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", pmk_r1_name,
WPA_PMK_NAME_LEN);
if (wpa_pmk_r1_to_ptk(pmk_r1, sta->snonce, sta->anonce,
sta->addr,
bss->bssid, pmk_r1_name, &ptk, ptk_name,
sta->key_mgmt,
sta->pairwise_cipher) < 0 ||
check_mic(ptk.kck, ptk.kck_len, sta->key_mgmt, ver, data,
len) < 0)
return -1;
} else if (wpa_pmk_to_ptk(pmk->pmk, sizeof(pmk->pmk),
"Pairwise key expansion",
bss->bssid, sta->addr, sta->anonce,
sta->snonce, &ptk, sta->key_mgmt,
sta->pairwise_cipher) < 0 ||
check_mic(ptk.kck, ptk.kck_len, sta->key_mgmt, ver, data,
len) < 0) {
return -1;
}
sta->tk_len = wpa_cipher_key_len(sta->pairwise_cipher);
wpa_printf(MSG_INFO, "Derived PTK for STA " MACSTR " BSSID " MACSTR,
MAC2STR(sta->addr), MAC2STR(bss->bssid));
sta->counters[WLANTEST_STA_COUNTER_PTK_LEARNED]++;
if (sta->ptk_set) {
/*
* Rekeying - use new PTK for EAPOL-Key frames, but continue
* using the old PTK for frame decryption.
*/
add_note(wt, MSG_DEBUG, "Derived PTK during rekeying");
os_memcpy(&sta->tptk, &ptk, sizeof(ptk));
wpa_hexdump(MSG_DEBUG, "TPTK:KCK",
sta->tptk.kck, sta->tptk.kck_len);
wpa_hexdump(MSG_DEBUG, "TPTK:KEK",
sta->tptk.kek, sta->tptk.kek_len);
wpa_hexdump(MSG_DEBUG, "TPTK:TK",
sta->tptk.tk, sta->tptk.tk_len);
sta->tptk_set = 1;
return 0;
}
add_note(wt, MSG_DEBUG, "Derived new PTK");
os_memcpy(&sta->ptk, &ptk, sizeof(ptk));
wpa_hexdump(MSG_DEBUG, "PTK:KCK", sta->ptk.kck, sta->ptk.kck_len);
wpa_hexdump(MSG_DEBUG, "PTK:KEK", sta->ptk.kek, sta->ptk.kek_len);
wpa_hexdump(MSG_DEBUG, "PTK:TK", sta->ptk.tk, sta->ptk.tk_len);
sta->ptk_set = 1;
os_memset(sta->rsc_tods, 0, sizeof(sta->rsc_tods));
os_memset(sta->rsc_fromds, 0, sizeof(sta->rsc_fromds));
return 0;
}
static void derive_ptk(struct wlantest *wt, struct wlantest_bss *bss,
struct wlantest_sta *sta, u16 ver,
const u8 *data, size_t len)
{
struct wlantest_pmk *pmk;
wpa_printf(MSG_DEBUG, "Trying to derive PTK for " MACSTR " (ver %u)",
MAC2STR(sta->addr), ver);
dl_list_for_each(pmk, &bss->pmk, struct wlantest_pmk, list) {
wpa_printf(MSG_DEBUG, "Try per-BSS PMK");
if (try_pmk(wt, bss, sta, ver, data, len, pmk) == 0)
return;
}
dl_list_for_each(pmk, &wt->pmk, struct wlantest_pmk, list) {
wpa_printf(MSG_DEBUG, "Try global PMK");
if (try_pmk(wt, bss, sta, ver, data, len, pmk) == 0)
return;
}
if (!sta->ptk_set) {
struct wlantest_ptk *ptk;
int prev_level = wpa_debug_level;
wpa_debug_level = MSG_WARNING;
dl_list_for_each(ptk, &wt->ptk, struct wlantest_ptk, list) {
if (check_mic(ptk->ptk.kck, ptk->ptk.kck_len,
sta->key_mgmt, ver, data, len) < 0)
continue;
wpa_printf(MSG_INFO, "Pre-set PTK matches for STA "
MACSTR " BSSID " MACSTR,
MAC2STR(sta->addr), MAC2STR(bss->bssid));
add_note(wt, MSG_DEBUG, "Using pre-set PTK");
ptk->ptk_len = 32 +
wpa_cipher_key_len(sta->pairwise_cipher);
os_memcpy(&sta->ptk, &ptk->ptk, sizeof(ptk->ptk));
wpa_hexdump(MSG_DEBUG, "PTK:KCK",
sta->ptk.kck, sta->ptk.kck_len);
wpa_hexdump(MSG_DEBUG, "PTK:KEK",
sta->ptk.kek, sta->ptk.kek_len);
wpa_hexdump(MSG_DEBUG, "PTK:TK",
sta->ptk.tk, sta->ptk.tk_len);
sta->ptk_set = 1;
os_memset(sta->rsc_tods, 0, sizeof(sta->rsc_tods));
os_memset(sta->rsc_fromds, 0, sizeof(sta->rsc_fromds));
}
wpa_debug_level = prev_level;
}
add_note(wt, MSG_DEBUG, "No matching PMK found to derive PTK");
}
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;
const u8 *key_data, *kck;
size_t kck_len;
u16 key_info, key_data_len;
struct wpa_eapol_ie_parse ie;
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);
if (is_zero(hdr->key_nonce, WPA_NONCE_LEN)) {
add_note(wt, MSG_INFO, "EAPOL-Key 2/4 from " MACSTR
" used zero nonce", MAC2STR(src));
}
if (!is_zero(hdr->key_rsc, 8)) {
add_note(wt, MSG_INFO, "EAPOL-Key 2/4 from " MACSTR
" used non-zero Key RSC", MAC2STR(src));
}
os_memcpy(sta->snonce, hdr->key_nonce, WPA_NONCE_LEN);
key_info = WPA_GET_BE16(hdr->key_info);
key_data_len = WPA_GET_BE16(hdr->key_data_length);
derive_ptk(wt, bss, sta, key_info & WPA_KEY_INFO_TYPE_MASK, data, len);
if (!sta->ptk_set && !sta->tptk_set) {
add_note(wt, MSG_DEBUG,
"No PTK known to process EAPOL-Key 2/4");
return;
}
kck = sta->ptk.kck;
kck_len = sta->ptk.kck_len;
if (sta->tptk_set) {
add_note(wt, MSG_DEBUG,
"Use TPTK for validation EAPOL-Key MIC");
kck = sta->tptk.kck;
kck_len = sta->tptk.kck_len;
}
if (check_mic(kck, kck_len, sta->key_mgmt,
key_info & WPA_KEY_INFO_TYPE_MASK, data, len) < 0) {
add_note(wt, MSG_INFO, "Mismatch in EAPOL-Key 2/4 MIC");
return;
}
add_note(wt, MSG_DEBUG, "Valid MIC found in EAPOL-Key 2/4");
key_data = (const u8 *) (hdr + 1);
if (wpa_supplicant_parse_ies(key_data, key_data_len, &ie) < 0) {
add_note(wt, MSG_INFO, "Failed to parse EAPOL-Key Key Data");
return;
}
if (ie.wpa_ie) {
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Key Data - WPA IE",
ie.wpa_ie, ie.wpa_ie_len);
if (os_memcmp(ie.wpa_ie, sta->rsnie, ie.wpa_ie_len) != 0) {
struct ieee802_11_elems elems;
add_note(wt, MSG_INFO,
"Mismatch in WPA IE between EAPOL-Key 2/4 "
"and (Re)Association Request from " MACSTR,
MAC2STR(sta->addr));
wpa_hexdump(MSG_INFO, "WPA IE in EAPOL-Key",
ie.wpa_ie, ie.wpa_ie_len);
wpa_hexdump(MSG_INFO, "WPA IE in (Re)Association "
"Request",
sta->rsnie,
sta->rsnie[0] ? 2 + sta->rsnie[1] : 0);
/*
* The sniffer may have missed (Re)Association
* Request, so try to survive with the information from
* EAPOL-Key.
*/
os_memset(&elems, 0, sizeof(elems));
elems.wpa_ie = ie.wpa_ie + 2;
elems.wpa_ie_len = ie.wpa_ie_len - 2;
wpa_printf(MSG_DEBUG, "Update STA data based on WPA "
"IE in EAPOL-Key 2/4");
sta_update_assoc(sta, &elems);
}
}
if (ie.rsn_ie) {
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Key Data - RSN IE",
ie.rsn_ie, ie.rsn_ie_len);
if (os_memcmp(ie.rsn_ie, sta->rsnie, ie.rsn_ie_len) != 0) {
struct ieee802_11_elems elems;
add_note(wt, MSG_INFO,
"Mismatch in RSN IE between EAPOL-Key 2/4 "
"and (Re)Association Request from " MACSTR,
MAC2STR(sta->addr));
wpa_hexdump(MSG_INFO, "RSN IE in EAPOL-Key",
ie.rsn_ie, ie.rsn_ie_len);
wpa_hexdump(MSG_INFO, "RSN IE in (Re)Association "
"Request",
sta->rsnie,
sta->rsnie[0] ? 2 + sta->rsnie[1] : 0);
/*
* The sniffer may have missed (Re)Association
* Request, so try to survive with the information from
* EAPOL-Key.
*/
os_memset(&elems, 0, sizeof(elems));
elems.rsn_ie = ie.rsn_ie + 2;
elems.rsn_ie_len = ie.rsn_ie_len - 2;
wpa_printf(MSG_DEBUG, "Update STA data based on RSN "
"IE in EAPOL-Key 2/4");
sta_update_assoc(sta, &elems);
}
}
}
static u8 * decrypt_eapol_key_data_rc4(struct wlantest *wt, const u8 *kek,
const struct wpa_eapol_key *hdr,
size_t *len)
{
u8 ek[32], *buf;
u16 keydatalen = WPA_GET_BE16(hdr->key_data_length);
buf = os_malloc(keydatalen);
if (buf == NULL)
return NULL;
os_memcpy(ek, hdr->key_iv, 16);
os_memcpy(ek + 16, kek, 16);
os_memcpy(buf, hdr + 1, keydatalen);
if (rc4_skip(ek, 32, 256, buf, keydatalen)) {
add_note(wt, MSG_INFO, "RC4 failed");
os_free(buf);
return NULL;
}
*len = keydatalen;
return buf;
}
static u8 * decrypt_eapol_key_data_aes(struct wlantest *wt, const u8 *kek,
const struct wpa_eapol_key *hdr,
size_t *len)
{
u8 *buf;
u16 keydatalen = WPA_GET_BE16(hdr->key_data_length);
if (keydatalen % 8) {
add_note(wt, MSG_INFO, "Unsupported AES-WRAP len %d",
keydatalen);
return NULL;
}
keydatalen -= 8; /* AES-WRAP adds 8 bytes */
buf = os_malloc(keydatalen);
if (buf == NULL)
return NULL;
if (aes_unwrap(kek, 16, keydatalen / 8, (u8 *) (hdr + 1), buf)) {
os_free(buf);
add_note(wt, MSG_INFO,
"AES unwrap failed - could not decrypt EAPOL-Key "
"key data");
return NULL;
}
*len = keydatalen;
return buf;
}
static u8 * decrypt_eapol_key_data(struct wlantest *wt, const u8 *kek,
size_t kek_len, u16 ver,
const struct wpa_eapol_key *hdr,
size_t *len)
{
if (kek_len != 16)
return NULL;
switch (ver) {
case WPA_KEY_INFO_TYPE_HMAC_MD5_RC4:
return decrypt_eapol_key_data_rc4(wt, kek, hdr, len);
case WPA_KEY_INFO_TYPE_HMAC_SHA1_AES:
case WPA_KEY_INFO_TYPE_AES_128_CMAC:
return decrypt_eapol_key_data_aes(wt, kek, hdr, len);
case WPA_KEY_INFO_TYPE_AKM_DEFINED:
/* For now, assume this is OSEN */
return decrypt_eapol_key_data_aes(wt, kek, hdr, len);
default:
add_note(wt, MSG_INFO,
"Unsupported EAPOL-Key Key Descriptor Version %u",
ver);
return NULL;
}
}
static void learn_kde_keys(struct wlantest *wt, struct wlantest_bss *bss,
struct wlantest_sta *sta,
const u8 *buf, size_t len, const u8 *rsc)
{
struct wpa_eapol_ie_parse ie;
if (wpa_supplicant_parse_ies(buf, len, &ie) < 0) {
add_note(wt, MSG_INFO, "Failed to parse EAPOL-Key Key Data");
return;
}
if (ie.wpa_ie) {
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Key Data - WPA IE",
ie.wpa_ie, ie.wpa_ie_len);
}
if (ie.rsn_ie) {
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Key Data - RSN IE",
ie.rsn_ie, ie.rsn_ie_len);
}
if (ie.gtk) {
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Key Data - GTK KDE",
ie.gtk, ie.gtk_len);
if (ie.gtk_len >= 2 && ie.gtk_len <= 2 + 32) {
int id;
id = ie.gtk[0] & 0x03;
add_note(wt, MSG_DEBUG, "GTK KeyID=%u tx=%u",
id, !!(ie.gtk[0] & 0x04));
if ((ie.gtk[0] & 0xf8) || ie.gtk[1]) {
add_note(wt, MSG_INFO,
"GTK KDE: Reserved field set: "
"%02x %02x", ie.gtk[0], ie.gtk[1]);
}
wpa_hexdump(MSG_DEBUG, "GTK", ie.gtk + 2,
ie.gtk_len - 2);
bss->gtk_len[id] = ie.gtk_len - 2;
sta->gtk_len = ie.gtk_len - 2;
os_memcpy(bss->gtk[id], ie.gtk + 2, ie.gtk_len - 2);
os_memcpy(sta->gtk, ie.gtk + 2, ie.gtk_len - 2);
bss->rsc[id][0] = rsc[5];
bss->rsc[id][1] = rsc[4];
bss->rsc[id][2] = rsc[3];
bss->rsc[id][3] = rsc[2];
bss->rsc[id][4] = rsc[1];
bss->rsc[id][5] = rsc[0];
bss->gtk_idx = id;
sta->gtk_idx = id;
wpa_hexdump(MSG_DEBUG, "RSC", bss->rsc[id], 6);
} else {
add_note(wt, MSG_INFO, "Invalid GTK KDE length %u",
(unsigned) ie.gtk_len);
}
}
if (ie.igtk) {
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Key Data - IGTK KDE",
ie.igtk, ie.igtk_len);
if (ie.igtk_len == 24) {
u16 id;
id = WPA_GET_LE16(ie.igtk);
if (id > 5) {
add_note(wt, MSG_INFO,
"Unexpected IGTK KeyID %u", id);
} else {
const u8 *ipn;
add_note(wt, MSG_DEBUG, "IGTK KeyID %u", id);
wpa_hexdump(MSG_DEBUG, "IPN", ie.igtk + 2, 6);
wpa_hexdump(MSG_DEBUG, "IGTK", ie.igtk + 8,
16);
os_memcpy(bss->igtk[id], ie.igtk + 8, 16);
bss->igtk_len[id] = 16;
ipn = ie.igtk + 2;
bss->ipn[id][0] = ipn[5];
bss->ipn[id][1] = ipn[4];
bss->ipn[id][2] = ipn[3];
bss->ipn[id][3] = ipn[2];
bss->ipn[id][4] = ipn[1];
bss->ipn[id][5] = ipn[0];
bss->igtk_idx = id;
}
} else if (ie.igtk_len == 40) {
u16 id;
id = WPA_GET_LE16(ie.igtk);
if (id > 5) {
add_note(wt, MSG_INFO,
"Unexpected IGTK KeyID %u", id);
} else {
const u8 *ipn;
add_note(wt, MSG_DEBUG, "IGTK KeyID %u", id);
wpa_hexdump(MSG_DEBUG, "IPN", ie.igtk + 2, 6);
wpa_hexdump(MSG_DEBUG, "IGTK", ie.igtk + 8,
32);
os_memcpy(bss->igtk[id], ie.igtk + 8, 32);
bss->igtk_len[id] = 32;
ipn = ie.igtk + 2;
bss->ipn[id][0] = ipn[5];
bss->ipn[id][1] = ipn[4];
bss->ipn[id][2] = ipn[3];
bss->ipn[id][3] = ipn[2];
bss->ipn[id][4] = ipn[1];
bss->ipn[id][5] = ipn[0];
bss->igtk_idx = id;
}
} else {
add_note(wt, MSG_INFO, "Invalid IGTK KDE length %u",
(unsigned) ie.igtk_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;
const u8 *key_data, *kck, *kek;
size_t kck_len, kek_len;
int recalc = 0;
u16 key_info, ver;
u8 *decrypted_buf = NULL;
const u8 *decrypted;
size_t decrypted_len = 0;
struct wpa_eapol_ie_parse ie;
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) {
add_note(wt, 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(wt, bss, sta, key_info & WPA_KEY_INFO_TYPE_MASK,
data, len);
}
if (!sta->ptk_set && !sta->tptk_set) {
add_note(wt, MSG_DEBUG,
"No PTK known to process EAPOL-Key 3/4");
return;
}
kek = sta->ptk.kek;
kek_len = sta->ptk.kek_len;
kck = sta->ptk.kck;
kck_len = sta->ptk.kck_len;
if (sta->tptk_set) {
add_note(wt, MSG_DEBUG,
"Use TPTK for validation EAPOL-Key MIC");
kck = sta->tptk.kck;
kck_len = sta->tptk.kck_len;
kek = sta->tptk.kek;
kek_len = sta->tptk.kek_len;
}
if (check_mic(kck, kck_len, sta->key_mgmt,
key_info & WPA_KEY_INFO_TYPE_MASK, data, len) < 0) {
add_note(wt, MSG_INFO, "Mismatch in EAPOL-Key 3/4 MIC");
return;
}
add_note(wt, MSG_DEBUG, "Valid MIC found in EAPOL-Key 3/4");
key_data = (const u8 *) (hdr + 1);
if (!(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
if (sta->proto & WPA_PROTO_RSN)
add_note(wt, MSG_INFO,
"EAPOL-Key 3/4 without EncrKeyData bit");
decrypted = key_data;
decrypted_len = WPA_GET_BE16(hdr->key_data_length);
} else {
ver = key_info & WPA_KEY_INFO_TYPE_MASK;
decrypted_buf = decrypt_eapol_key_data(wt, kek, kek_len, ver,
hdr, &decrypted_len);
if (decrypted_buf == NULL) {
add_note(wt, MSG_INFO,
"Failed to decrypt EAPOL-Key Key Data");
return;
}
decrypted = decrypted_buf;
wpa_hexdump(MSG_DEBUG, "Decrypted EAPOL-Key Key Data",
decrypted, decrypted_len);
}
if (wt->write_pcap_dumper && decrypted != key_data) {
/* Fill in a dummy Data frame header */
u8 buf[24 + 8 + sizeof(*eapol) + sizeof(*hdr)];
struct ieee80211_hdr *h;
struct wpa_eapol_key *k;
const u8 *p;
u8 *pos;
size_t plain_len;
plain_len = decrypted_len;
p = decrypted;
while (p + 1 < decrypted + decrypted_len) {
if (p[0] == 0xdd && p[1] == 0x00) {
/* Remove padding */
plain_len = p - decrypted;
break;
}
p += 2 + p[1];
}
os_memset(buf, 0, sizeof(buf));
h = (struct ieee80211_hdr *) buf;
h->frame_control = host_to_le16(0x0208);
os_memcpy(h->addr1, dst, ETH_ALEN);
os_memcpy(h->addr2, src, ETH_ALEN);
os_memcpy(h->addr3, src, ETH_ALEN);
pos = (u8 *) (h + 1);
os_memcpy(pos, "\xaa\xaa\x03\x00\x00\x00\x88\x8e", 8);
pos += 8;
os_memcpy(pos, eapol, sizeof(*eapol));
pos += sizeof(*eapol);
os_memcpy(pos, hdr, sizeof(*hdr));
k = (struct wpa_eapol_key *) pos;
WPA_PUT_BE16(k->key_info,
key_info & ~WPA_KEY_INFO_ENCR_KEY_DATA);
WPA_PUT_BE16(k->key_data_length, plain_len);
write_pcap_decrypted(wt, buf, sizeof(buf),
decrypted, plain_len);
}
if (wpa_supplicant_parse_ies(decrypted, decrypted_len, &ie) < 0) {
add_note(wt, MSG_INFO, "Failed to parse EAPOL-Key Key Data");
os_free(decrypted_buf);
return;
}
if ((ie.wpa_ie &&
os_memcmp(ie.wpa_ie, bss->wpaie, ie.wpa_ie_len) != 0) ||
(ie.wpa_ie == NULL && bss->wpaie[0])) {
add_note(wt, MSG_INFO,
"Mismatch in WPA IE between EAPOL-Key 3/4 and "
"Beacon/Probe Response from " MACSTR,
MAC2STR(bss->bssid));
wpa_hexdump(MSG_INFO, "WPA IE in EAPOL-Key",
ie.wpa_ie, ie.wpa_ie_len);
wpa_hexdump(MSG_INFO, "WPA IE in Beacon/Probe "
"Response",
bss->wpaie,
bss->wpaie[0] ? 2 + bss->wpaie[1] : 0);
}
if ((ie.rsn_ie &&
os_memcmp(ie.rsn_ie, bss->rsnie, ie.rsn_ie_len) != 0) ||
(ie.rsn_ie == NULL && bss->rsnie[0])) {
add_note(wt, MSG_INFO, "Mismatch in RSN IE between EAPOL-Key "
"3/4 and Beacon/Probe Response from " MACSTR,
MAC2STR(bss->bssid));
wpa_hexdump(MSG_INFO, "RSN IE in EAPOL-Key",
ie.rsn_ie, ie.rsn_ie_len);
wpa_hexdump(MSG_INFO, "RSN IE in Beacon/Probe Response",
bss->rsnie,
bss->rsnie[0] ? 2 + bss->rsnie[1] : 0);
}
learn_kde_keys(wt, bss, sta, decrypted, decrypted_len, hdr->key_rsc);
os_free(decrypted_buf);
}
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;
const u8 *kck;
size_t kck_len;
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);
if (!is_zero(hdr->key_rsc, 8)) {
add_note(wt, MSG_INFO, "EAPOL-Key 4/4 from " MACSTR " used "
"non-zero Key RSC", MAC2STR(src));
}
key_info = WPA_GET_BE16(hdr->key_info);
if (!sta->ptk_set && !sta->tptk_set) {
add_note(wt, MSG_DEBUG,
"No PTK known to process EAPOL-Key 4/4");
return;
}
kck = sta->ptk.kck;
kck_len = sta->ptk.kck_len;
if (sta->tptk_set) {
add_note(wt, MSG_DEBUG,
"Use TPTK for validation EAPOL-Key MIC");
kck = sta->tptk.kck;
kck_len = sta->tptk.kck_len;
}
if (check_mic(kck, kck_len, sta->key_mgmt,
key_info & WPA_KEY_INFO_TYPE_MASK, data, len) < 0) {
add_note(wt, MSG_INFO, "Mismatch in EAPOL-Key 4/4 MIC");
return;
}
add_note(wt, MSG_DEBUG, "Valid MIC found in EAPOL-Key 4/4");
if (sta->tptk_set) {
add_note(wt, MSG_DEBUG, "Update PTK (rekeying)");
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));
}
}
static void rx_data_eapol_key_1_of_2(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, ver;
u8 *decrypted;
size_t decrypted_len = 0;
wpa_printf(MSG_DEBUG, "EAPOL-Key 1/2 " 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 (!sta->ptk_set) {
add_note(wt, MSG_DEBUG,
"No PTK known to process EAPOL-Key 1/2");
return;
}
if (sta->ptk_set &&
check_mic(sta->ptk.kck, sta->ptk.kck_len, sta->key_mgmt,
key_info & WPA_KEY_INFO_TYPE_MASK,
data, len) < 0) {
add_note(wt, MSG_INFO, "Mismatch in EAPOL-Key 1/2 MIC");
return;
}
add_note(wt, MSG_DEBUG, "Valid MIC found in EAPOL-Key 1/2");
if (sta->proto & WPA_PROTO_RSN &&
!(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
add_note(wt, MSG_INFO, "EAPOL-Key 1/2 without EncrKeyData bit");
return;
}
ver = key_info & WPA_KEY_INFO_TYPE_MASK;
decrypted = decrypt_eapol_key_data(wt, sta->ptk.kek, sta->ptk.kek_len,
ver, hdr, &decrypted_len);
if (decrypted == NULL) {
add_note(wt, MSG_INFO, "Failed to decrypt EAPOL-Key Key Data");
return;
}
wpa_hexdump(MSG_DEBUG, "Decrypted EAPOL-Key Key Data",
decrypted, decrypted_len);
if (wt->write_pcap_dumper) {
/* Fill in a dummy Data frame header */
u8 buf[24 + 8 + sizeof(*eapol) + sizeof(*hdr)];
struct ieee80211_hdr *h;
struct wpa_eapol_key *k;
u8 *pos;
size_t plain_len;
plain_len = decrypted_len;
pos = decrypted;
while (pos + 1 < decrypted + decrypted_len) {
if (pos[0] == 0xdd && pos[1] == 0x00) {
/* Remove padding */
plain_len = pos - decrypted;
break;
}
pos += 2 + pos[1];
}
os_memset(buf, 0, sizeof(buf));
h = (struct ieee80211_hdr *) buf;
h->frame_control = host_to_le16(0x0208);
os_memcpy(h->addr1, dst, ETH_ALEN);
os_memcpy(h->addr2, src, ETH_ALEN);
os_memcpy(h->addr3, src, ETH_ALEN);
pos = (u8 *) (h + 1);
os_memcpy(pos, "\xaa\xaa\x03\x00\x00\x00\x88\x8e", 8);
pos += 8;
os_memcpy(pos, eapol, sizeof(*eapol));
pos += sizeof(*eapol);
os_memcpy(pos, hdr, sizeof(*hdr));
k = (struct wpa_eapol_key *) pos;
WPA_PUT_BE16(k->key_info,
key_info & ~WPA_KEY_INFO_ENCR_KEY_DATA);
WPA_PUT_BE16(k->key_data_length, plain_len);
write_pcap_decrypted(wt, buf, sizeof(buf),
decrypted, plain_len);
}
if (sta->proto & WPA_PROTO_RSN)
learn_kde_keys(wt, bss, sta, decrypted, decrypted_len,
hdr->key_rsc);
else {
int klen = bss->group_cipher == WPA_CIPHER_TKIP ? 32 : 16;
if (decrypted_len == klen) {
const u8 *rsc = hdr->key_rsc;
int id;
id = (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >>
WPA_KEY_INFO_KEY_INDEX_SHIFT;
add_note(wt, MSG_DEBUG, "GTK key index %d", id);
wpa_hexdump(MSG_DEBUG, "GTK", decrypted,
decrypted_len);
bss->gtk_len[id] = decrypted_len;
os_memcpy(bss->gtk[id], decrypted, decrypted_len);
bss->rsc[id][0] = rsc[5];
bss->rsc[id][1] = rsc[4];
bss->rsc[id][2] = rsc[3];
bss->rsc[id][3] = rsc[2];
bss->rsc[id][4] = rsc[1];
bss->rsc[id][5] = rsc[0];
wpa_hexdump(MSG_DEBUG, "RSC", bss->rsc[id], 6);
} else {
add_note(wt, MSG_INFO, "Unexpected WPA Key Data length "
"in Group Key msg 1/2 from " MACSTR,
MAC2STR(src));
}
}
os_free(decrypted);
}
static void rx_data_eapol_key_2_of_2(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 2/2 " 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);
if (!is_zero(hdr->key_rsc, 8)) {
add_note(wt, MSG_INFO, "EAPOL-Key 2/2 from " MACSTR " used "
"non-zero Key RSC", MAC2STR(src));
}
key_info = WPA_GET_BE16(hdr->key_info);
if (!sta->ptk_set) {
add_note(wt, MSG_DEBUG,
"No PTK known to process EAPOL-Key 2/2");
return;
}
if (sta->ptk_set &&
check_mic(sta->ptk.kck, sta->ptk.kck_len, sta->key_mgmt,
key_info & WPA_KEY_INFO_TYPE_MASK,
data, len) < 0) {
add_note(wt, MSG_INFO, "Mismatch in EAPOL-Key 2/2 MIC");
return;
}
add_note(wt, MSG_DEBUG, "Valid MIC found in EAPOL-Key 2/2");
}
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;
const u8 *key_data;
u16 key_info, key_length, ver, key_data_length;
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)) {
add_note(wt, MSG_INFO, "Too short EAPOL-Key frame from " MACSTR,
MAC2STR(src));
return;
}
if (hdr->type == EAPOL_KEY_TYPE_RC4) {
/* TODO: EAPOL-Key RC4 for WEP */
wpa_printf(MSG_INFO, "EAPOL-Key Descriptor Type RC4 from "
MACSTR, MAC2STR(src));
return;
}
if (hdr->type != EAPOL_KEY_TYPE_RSN &&
hdr->type != EAPOL_KEY_TYPE_WPA) {
wpa_printf(MSG_INFO, "Unsupported EAPOL-Key Descriptor Type "
"%u from " MACSTR, hdr->type, MAC2STR(src));
return;
}
key_info = WPA_GET_BE16(hdr->key_info);
key_length = WPA_GET_BE16(hdr->key_length);
key_data_length = WPA_GET_BE16(hdr->key_data_length);
key_data = (const u8 *) (hdr + 1);
if (key_data + key_data_length > data + len) {
add_note(wt, MSG_INFO, "Truncated EAPOL-Key from " MACSTR,
MAC2STR(src));
return;
}
if (key_data + key_data_length < data + len) {
wpa_hexdump(MSG_DEBUG, "Extra data after EAPOL-Key Key Data "
"field", key_data + key_data_length,
data + len - key_data - key_data_length);
}
ver = key_info & WPA_KEY_INFO_TYPE_MASK;
wpa_printf(MSG_DEBUG, "EAPOL-Key ver=%u %c idx=%u%s%s%s%s%s%s%s%s "
"datalen=%u",
ver, key_info & WPA_KEY_INFO_KEY_TYPE ? 'P' : 'G',
(key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >>
WPA_KEY_INFO_KEY_INDEX_SHIFT,
(key_info & WPA_KEY_INFO_INSTALL) ? " Install" : "",
(key_info & WPA_KEY_INFO_ACK) ? " ACK" : "",
(key_info & WPA_KEY_INFO_MIC) ? " MIC" : "",
(key_info & WPA_KEY_INFO_SECURE) ? " Secure" : "",
(key_info & WPA_KEY_INFO_ERROR) ? " Error" : "",
(key_info & WPA_KEY_INFO_REQUEST) ? " Request" : "",
(key_info & WPA_KEY_INFO_ENCR_KEY_DATA) ? " Encr" : "",
(key_info & WPA_KEY_INFO_SMK_MESSAGE) ? " SMK" : "",
key_data_length);
if (ver != WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 &&
ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES &&
ver != WPA_KEY_INFO_TYPE_AES_128_CMAC &&
ver != WPA_KEY_INFO_TYPE_AKM_DEFINED) {
wpa_printf(MSG_INFO, "Unsupported EAPOL-Key Key Descriptor "
"Version %u from " MACSTR, ver, MAC2STR(src));
return;
}
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Replay Counter",
hdr->replay_counter, WPA_REPLAY_COUNTER_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Key Nonce",
hdr->key_nonce, WPA_NONCE_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Key IV",
hdr->key_iv, 16);
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key RSC",
hdr->key_rsc, WPA_KEY_RSC_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Key MIC",
hdr->key_mic, 16);
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Key Data",
key_data, key_data_length);
if (hdr->type == EAPOL_KEY_TYPE_RSN &&
(key_info & (WPA_KEY_INFO_KEY_INDEX_MASK | BIT(14) | BIT(15))) !=
0) {
wpa_printf(MSG_INFO, "RSN EAPOL-Key with non-zero reserved "
"Key Info bits 0x%x from " MACSTR,
key_info, MAC2STR(src));
}
if (hdr->type == EAPOL_KEY_TYPE_WPA &&
(key_info & (WPA_KEY_INFO_ENCR_KEY_DATA |
WPA_KEY_INFO_SMK_MESSAGE |BIT(14) | BIT(15))) != 0) {
wpa_printf(MSG_INFO, "WPA EAPOL-Key with non-zero reserved "
"Key Info bits 0x%x from " MACSTR,
key_info, MAC2STR(src));
}
if (key_length > 32) {
wpa_printf(MSG_INFO, "EAPOL-Key with invalid Key Length %d "
"from " MACSTR, key_length, MAC2STR(src));
}
if (ver != WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 &&
!is_zero(hdr->key_iv, 16)) {
wpa_printf(MSG_INFO, "EAPOL-Key with non-zero Key IV "
"(reserved with ver=%d) field from " MACSTR,
ver, MAC2STR(src));
wpa_hexdump(MSG_INFO, "EAPOL-Key Key IV (reserved)",
hdr->key_iv, 16);
}
if (!is_zero(hdr->key_id, 8)) {
wpa_printf(MSG_INFO, "EAPOL-Key with non-zero Key ID "
"(reserved) field from " MACSTR, MAC2STR(src));
wpa_hexdump(MSG_INFO, "EAPOL-Key Key ID (reserved)",
hdr->key_id, 8);
}
if (hdr->key_rsc[6] || hdr->key_rsc[7]) {
wpa_printf(MSG_INFO, "EAPOL-Key with non-zero Key RSC octets "
"(last two are unused)" MACSTR, MAC2STR(src));
}
if (key_info & (WPA_KEY_INFO_ERROR | WPA_KEY_INFO_REQUEST))
return;
if (key_info & WPA_KEY_INFO_SMK_MESSAGE)
return;
if (key_info & WPA_KEY_INFO_KEY_TYPE) {
/* 4-Way Handshake */
switch (key_info & (WPA_KEY_INFO_SECURE |
WPA_KEY_INFO_MIC |
WPA_KEY_INFO_ACK |
WPA_KEY_INFO_INSTALL)) {
case WPA_KEY_INFO_ACK:
rx_data_eapol_key_1_of_4(wt, dst, src, data, len);
break;
case WPA_KEY_INFO_MIC:
if (key_data_length == 0)
rx_data_eapol_key_4_of_4(wt, dst, src, data,
len);
else
rx_data_eapol_key_2_of_4(wt, dst, src, data,
len);
break;
case WPA_KEY_INFO_MIC | WPA_KEY_INFO_ACK |
WPA_KEY_INFO_INSTALL:
/* WPA does not include Secure bit in 3/4 */
rx_data_eapol_key_3_of_4(wt, dst, src, data, len);
break;
case WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC |
WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL:
rx_data_eapol_key_3_of_4(wt, dst, src, data, len);
break;
case WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC:
if (key_data_length == 0)
rx_data_eapol_key_4_of_4(wt, dst, src, data,
len);
else
rx_data_eapol_key_2_of_4(wt, dst, src, data,
len);
break;
default:
wpa_printf(MSG_DEBUG, "Unsupported EAPOL-Key frame");
break;
}
} else {
/* Group Key Handshake */
switch (key_info & (WPA_KEY_INFO_SECURE |
WPA_KEY_INFO_MIC |
WPA_KEY_INFO_ACK)) {
case WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC |
WPA_KEY_INFO_ACK:
rx_data_eapol_key_1_of_2(wt, dst, src, data, len);
break;
case WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC:
rx_data_eapol_key_2_of_2(wt, dst, src, data, len);
break;
default:
wpa_printf(MSG_DEBUG, "Unsupported EAPOL-Key frame");
break;
}
}
}
void rx_data_eapol(struct wlantest *wt, const u8 *dst, const u8 *src,
const u8 *data, size_t len, int prot)
{
const struct ieee802_1x_hdr *hdr;
u16 length;
const u8 *p;
wpa_hexdump(MSG_EXCESSIVE, "EAPOL", data, len);
if (len < sizeof(*hdr)) {
wpa_printf(MSG_INFO, "Too short EAPOL frame from " MACSTR,
MAC2STR(src));
return;
}
hdr = (const struct ieee802_1x_hdr *) data;
length = be_to_host16(hdr->length);
wpa_printf(MSG_DEBUG, "RX EAPOL: " MACSTR " -> " MACSTR "%s ver=%u "
"type=%u len=%u",
MAC2STR(src), MAC2STR(dst), prot ? " Prot" : "",
hdr->version, hdr->type, length);
if (hdr->version < 1 || hdr->version > 3) {
wpa_printf(MSG_INFO, "Unexpected EAPOL version %u from "
MACSTR, hdr->version, MAC2STR(src));
}
if (sizeof(*hdr) + length > len) {
wpa_printf(MSG_INFO, "Truncated EAPOL frame from " MACSTR,
MAC2STR(src));
return;
}
if (sizeof(*hdr) + length < len) {
wpa_printf(MSG_INFO, "EAPOL frame with %d extra bytes",
(int) (len - sizeof(*hdr) - length));
}
p = (const u8 *) (hdr + 1);
switch (hdr->type) {
case IEEE802_1X_TYPE_EAP_PACKET:
wpa_hexdump(MSG_MSGDUMP, "EAPOL - EAP packet", p, length);
break;
case IEEE802_1X_TYPE_EAPOL_START:
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Start", p, length);
break;
case IEEE802_1X_TYPE_EAPOL_LOGOFF:
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Logoff", p, length);
break;
case IEEE802_1X_TYPE_EAPOL_KEY:
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",
p, length);
break;
default:
wpa_hexdump(MSG_MSGDUMP, "Unknown EAPOL payload", p, length);
break;
}
}
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