wlantest: Parse EAPOL-Key frames

This commit is contained in:
Jouni Malinen 2010-11-06 21:49:57 +02:00
parent 021a6fe499
commit 32234bba52

View file

@ -16,6 +16,8 @@
#include "utils/common.h" #include "utils/common.h"
#include "common/ieee802_11_defs.h" #include "common/ieee802_11_defs.h"
#include "common/eapol_common.h"
#include "common/wpa_common.h"
#include "wlantest.h" #include "wlantest.h"
@ -57,16 +59,309 @@ static const char * data_stype(u16 stype)
} }
static void rx_data_eapol_key_1_of_4(struct wlantest *wt, const u8 *dst,
const u8 *src, const u8 *data, size_t len)
{
wpa_printf(MSG_DEBUG, "EAPOL-Key 1/4 " MACSTR " -> " MACSTR,
MAC2STR(src), MAC2STR(dst));
}
static void rx_data_eapol_key_2_of_4(struct wlantest *wt, const u8 *dst,
const u8 *src, const u8 *data, size_t len)
{
wpa_printf(MSG_DEBUG, "EAPOL-Key 2/4 " MACSTR " -> " MACSTR,
MAC2STR(src), MAC2STR(dst));
}
static void rx_data_eapol_key_3_of_4(struct wlantest *wt, const u8 *dst,
const u8 *src, const u8 *data, size_t len)
{
wpa_printf(MSG_DEBUG, "EAPOL-Key 3/4 " MACSTR " -> " MACSTR,
MAC2STR(src), MAC2STR(dst));
}
static void rx_data_eapol_key_4_of_4(struct wlantest *wt, const u8 *dst,
const u8 *src, const u8 *data, size_t len)
{
wpa_printf(MSG_DEBUG, "EAPOL-Key 4/4 " MACSTR " -> " MACSTR,
MAC2STR(src), MAC2STR(dst));
}
static void rx_data_eapol_key_1_of_2(struct wlantest *wt, const u8 *dst,
const u8 *src, const u8 *data, size_t len)
{
wpa_printf(MSG_DEBUG, "EAPOL-Key 1/2 " MACSTR " -> " MACSTR,
MAC2STR(src), MAC2STR(dst));
}
static void rx_data_eapol_key_2_of_2(struct wlantest *wt, const u8 *dst,
const u8 *src, const u8 *data, size_t len)
{
wpa_printf(MSG_DEBUG, "EAPOL-Key 2/2 " MACSTR " -> " MACSTR,
MAC2STR(src), MAC2STR(dst));
}
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 wpa_eapol_key *hdr;
u16 key_info, key_length, ver, key_data_length;
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key", data, len);
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 */
return;
}
if (hdr->type != EAPOL_KEY_TYPE_RSN &&
hdr->type != EAPOL_KEY_TYPE_WPA) {
wpa_printf(MSG_DEBUG, "Unsupported EAPOL-Key type %u",
hdr->type);
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);
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) {
wpa_printf(MSG_DEBUG, "Unsupported EAPOL-Key Key Descriptor "
"Version %u", ver);
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_nonce, WPA_KEY_RSC_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Key MIC",
hdr->key_mic, 16);
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:
rx_data_eapol_key_2_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:
rx_data_eapol_key_4_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;
}
}
}
static 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 (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, p, 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;
}
}
static void rx_data_eth(struct wlantest *wt, const u8 *dst, const u8 *src,
u16 ethertype, const u8 *data, size_t len, int prot)
{
if (ethertype == ETH_P_PAE)
rx_data_eapol(wt, dst, src, data, len, prot);
}
static void rx_data_process(struct wlantest *wt, const u8 *dst, const u8 *src,
const u8 *data, size_t len, int prot)
{
if (len >= 8 && os_memcmp(data, "\xaa\xaa\x03\x00\x00\x00", 6) == 0) {
rx_data_eth(wt, dst, src, WPA_GET_BE16(data + 6),
data + 8, len - 8, prot);
return;
}
wpa_hexdump(MSG_DEBUG, "Unrecognized LLC", data, len > 8 ? len : 7);
}
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)
{
/* TODO: Try to decrypt and if success, call rx_data_process() with
* prot = 1 */
}
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
rx_data_process(wt, dst, src, data, len, 0);
}
void rx_data(struct wlantest *wt, const u8 *data, size_t len) void rx_data(struct wlantest *wt, const u8 *data, size_t len)
{ {
const struct ieee80211_hdr *hdr; const struct ieee80211_hdr *hdr;
u16 fc; u16 fc, stype;
size_t hdrlen;
const u8 *qos = NULL;
if (len < 24) if (len < 24)
return; return;
hdr = (const struct ieee80211_hdr *) data; hdr = (const struct ieee80211_hdr *) data;
fc = le_to_host16(hdr->frame_control); 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++; wt->rx_data++;
switch (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) { switch (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) {
@ -87,6 +382,8 @@ void rx_data(struct wlantest *wt, const u8 *data, size_t len)
fc & WLAN_FC_ISWEP ? " Prot" : "", fc & WLAN_FC_ISWEP ? " Prot" : "",
MAC2STR(hdr->addr1), MAC2STR(hdr->addr2), MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
MAC2STR(hdr->addr3)); MAC2STR(hdr->addr3));
rx_data_bss(wt, hdr, qos, hdr->addr1, hdr->addr2,
data + hdrlen, len - hdrlen);
break; break;
case WLAN_FC_TODS: case WLAN_FC_TODS:
wpa_printf(MSG_EXCESSIVE, "DATA %s%s%s ToDS BSSID=" MACSTR wpa_printf(MSG_EXCESSIVE, "DATA %s%s%s ToDS BSSID=" MACSTR
@ -96,6 +393,8 @@ void rx_data(struct wlantest *wt, const u8 *data, size_t len)
fc & WLAN_FC_ISWEP ? " Prot" : "", fc & WLAN_FC_ISWEP ? " Prot" : "",
MAC2STR(hdr->addr1), MAC2STR(hdr->addr2), MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
MAC2STR(hdr->addr3)); MAC2STR(hdr->addr3));
rx_data_bss(wt, hdr, qos, hdr->addr3, hdr->addr2,
data + hdrlen, len - hdrlen);
break; break;
case WLAN_FC_TODS | WLAN_FC_FROMDS: case WLAN_FC_TODS | WLAN_FC_FROMDS:
wpa_printf(MSG_EXCESSIVE, "DATA %s%s%s WDS RA=" MACSTR " TA=" wpa_printf(MSG_EXCESSIVE, "DATA %s%s%s WDS RA=" MACSTR " TA="