wlantest: Parse EAPOL-Key frames
This commit is contained in:
Jouni Malinen
parent
021a6fe499
commit
32234bba52
1 changed files with 300 additions and 1 deletions
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@ -16,6 +16,8 @@
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#include "utils/common.h"
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#include "common/ieee802_11_defs.h"
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#include "common/eapol_common.h"
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#include "common/wpa_common.h"
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#include "wlantest.h"
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@ -57,16 +59,309 @@ static const char * data_stype(u16 stype)
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}
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static void rx_data_eapol_key_1_of_4(struct wlantest *wt, const u8 *dst,
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const u8 *src, const u8 *data, size_t len)
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{
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wpa_printf(MSG_DEBUG, "EAPOL-Key 1/4 " MACSTR " -> " MACSTR,
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MAC2STR(src), MAC2STR(dst));
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}
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static void rx_data_eapol_key_2_of_4(struct wlantest *wt, const u8 *dst,
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const u8 *src, const u8 *data, size_t len)
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{
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wpa_printf(MSG_DEBUG, "EAPOL-Key 2/4 " MACSTR " -> " MACSTR,
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MAC2STR(src), MAC2STR(dst));
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}
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static void rx_data_eapol_key_3_of_4(struct wlantest *wt, const u8 *dst,
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const u8 *src, const u8 *data, size_t len)
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{
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wpa_printf(MSG_DEBUG, "EAPOL-Key 3/4 " MACSTR " -> " MACSTR,
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MAC2STR(src), MAC2STR(dst));
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}
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static void rx_data_eapol_key_4_of_4(struct wlantest *wt, const u8 *dst,
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const u8 *src, const u8 *data, size_t len)
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{
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wpa_printf(MSG_DEBUG, "EAPOL-Key 4/4 " MACSTR " -> " MACSTR,
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MAC2STR(src), MAC2STR(dst));
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}
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static void rx_data_eapol_key_1_of_2(struct wlantest *wt, const u8 *dst,
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const u8 *src, const u8 *data, size_t len)
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{
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wpa_printf(MSG_DEBUG, "EAPOL-Key 1/2 " MACSTR " -> " MACSTR,
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MAC2STR(src), MAC2STR(dst));
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}
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static void rx_data_eapol_key_2_of_2(struct wlantest *wt, const u8 *dst,
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const u8 *src, const u8 *data, size_t len)
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{
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wpa_printf(MSG_DEBUG, "EAPOL-Key 2/2 " MACSTR " -> " MACSTR,
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MAC2STR(src), MAC2STR(dst));
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}
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static void rx_data_eapol_key(struct wlantest *wt, const u8 *dst,
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const u8 *src, const u8 *data, size_t len,
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int prot)
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{
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const struct wpa_eapol_key *hdr;
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u16 key_info, key_length, ver, key_data_length;
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wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key", data, len);
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if (len < sizeof(*hdr)) {
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wpa_printf(MSG_INFO, "Too short EAPOL-Key frame from " MACSTR,
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MAC2STR(src));
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return;
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}
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hdr = (const struct wpa_eapol_key *) data;
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if (hdr->type == EAPOL_KEY_TYPE_RC4) {
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/* TODO: EAPOL-Key RC4 for WEP */
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return;
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}
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if (hdr->type != EAPOL_KEY_TYPE_RSN &&
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hdr->type != EAPOL_KEY_TYPE_WPA) {
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wpa_printf(MSG_DEBUG, "Unsupported EAPOL-Key type %u",
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hdr->type);
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return;
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}
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key_info = WPA_GET_BE16(hdr->key_info);
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key_length = WPA_GET_BE16(hdr->key_length);
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key_data_length = WPA_GET_BE16(hdr->key_data_length);
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ver = key_info & WPA_KEY_INFO_TYPE_MASK;
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wpa_printf(MSG_DEBUG, "EAPOL-Key ver=%u %c idx=%u%s%s%s%s%s%s%s%s "
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"datalen=%u",
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ver, key_info & WPA_KEY_INFO_KEY_TYPE ? 'P' : 'G',
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(key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >>
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WPA_KEY_INFO_KEY_INDEX_SHIFT,
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(key_info & WPA_KEY_INFO_INSTALL) ? " Install" : "",
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(key_info & WPA_KEY_INFO_ACK) ? " ACK" : "",
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(key_info & WPA_KEY_INFO_MIC) ? " MIC" : "",
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(key_info & WPA_KEY_INFO_SECURE) ? " Secure" : "",
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(key_info & WPA_KEY_INFO_ERROR) ? " Error" : "",
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(key_info & WPA_KEY_INFO_REQUEST) ? " Request" : "",
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(key_info & WPA_KEY_INFO_ENCR_KEY_DATA) ? " Encr" : "",
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(key_info & WPA_KEY_INFO_SMK_MESSAGE) ? " SMK" : "",
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key_data_length);
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if (ver != WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 &&
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ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES &&
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ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
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wpa_printf(MSG_DEBUG, "Unsupported EAPOL-Key Key Descriptor "
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"Version %u", ver);
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return;
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}
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wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Replay Counter",
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hdr->replay_counter, WPA_REPLAY_COUNTER_LEN);
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wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Key Nonce",
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hdr->key_nonce, WPA_NONCE_LEN);
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wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Key IV",
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hdr->key_iv, 16);
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wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key RSC",
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hdr->key_nonce, WPA_KEY_RSC_LEN);
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wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Key MIC",
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hdr->key_mic, 16);
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if (key_info & (WPA_KEY_INFO_ERROR | WPA_KEY_INFO_REQUEST))
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return;
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if (key_info & WPA_KEY_INFO_SMK_MESSAGE)
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return;
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if (key_info & WPA_KEY_INFO_KEY_TYPE) {
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/* 4-Way Handshake */
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switch (key_info & (WPA_KEY_INFO_SECURE |
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WPA_KEY_INFO_MIC |
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WPA_KEY_INFO_ACK |
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WPA_KEY_INFO_INSTALL)) {
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case WPA_KEY_INFO_ACK:
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rx_data_eapol_key_1_of_4(wt, dst, src, data, len);
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break;
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case WPA_KEY_INFO_MIC:
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rx_data_eapol_key_2_of_4(wt, dst, src, data, len);
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break;
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case WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC |
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WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL:
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rx_data_eapol_key_3_of_4(wt, dst, src, data, len);
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break;
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case WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC:
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rx_data_eapol_key_4_of_4(wt, dst, src, data, len);
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break;
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default:
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wpa_printf(MSG_DEBUG, "Unsupported EAPOL-Key frame");
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break;
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}
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} else {
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/* Group Key Handshake */
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switch (key_info & (WPA_KEY_INFO_SECURE |
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WPA_KEY_INFO_MIC |
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WPA_KEY_INFO_ACK)) {
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case WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC |
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WPA_KEY_INFO_ACK:
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rx_data_eapol_key_1_of_2(wt, dst, src, data, len);
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break;
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case WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC:
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rx_data_eapol_key_2_of_2(wt, dst, src, data, len);
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break;
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default:
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wpa_printf(MSG_DEBUG, "Unsupported EAPOL-Key frame");
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break;
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}
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}
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}
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static void rx_data_eapol(struct wlantest *wt, const u8 *dst, const u8 *src,
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const u8 *data, size_t len, int prot)
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{
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const struct ieee802_1x_hdr *hdr;
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u16 length;
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const u8 *p;
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wpa_hexdump(MSG_EXCESSIVE, "EAPOL", data, len);
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if (len < sizeof(*hdr)) {
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wpa_printf(MSG_INFO, "Too short EAPOL frame from " MACSTR,
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MAC2STR(src));
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return;
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}
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hdr = (const struct ieee802_1x_hdr *) data;
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length = be_to_host16(hdr->length);
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wpa_printf(MSG_DEBUG, "RX EAPOL: " MACSTR " -> " MACSTR "%s ver=%u "
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"type=%u len=%u",
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MAC2STR(src), MAC2STR(dst), prot ? " Prot" : "",
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hdr->version, hdr->type, length);
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if (sizeof(*hdr) + length > len) {
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wpa_printf(MSG_INFO, "Truncated EAPOL frame from " MACSTR,
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MAC2STR(src));
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return;
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}
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if (sizeof(*hdr) + length < len) {
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wpa_printf(MSG_INFO, "EAPOL frame with %d extra bytes",
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(int) (len - sizeof(*hdr) - length));
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}
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p = (const u8 *) (hdr + 1);
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switch (hdr->type) {
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case IEEE802_1X_TYPE_EAP_PACKET:
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wpa_hexdump(MSG_MSGDUMP, "EAPOL - EAP packet", p, length);
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break;
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case IEEE802_1X_TYPE_EAPOL_START:
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wpa_hexdump(MSG_MSGDUMP, "EAPOL-Start", p, length);
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break;
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case IEEE802_1X_TYPE_EAPOL_LOGOFF:
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wpa_hexdump(MSG_MSGDUMP, "EAPOL-Logoff", p, length);
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break;
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case IEEE802_1X_TYPE_EAPOL_KEY:
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rx_data_eapol_key(wt, dst, src, p, length, prot);
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break;
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case IEEE802_1X_TYPE_EAPOL_ENCAPSULATED_ASF_ALERT:
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wpa_hexdump(MSG_MSGDUMP, "EAPOL - Encapsulated ASF alert",
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p, length);
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break;
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default:
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wpa_hexdump(MSG_MSGDUMP, "Unknown EAPOL payload", p, length);
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break;
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}
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}
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static void rx_data_eth(struct wlantest *wt, const u8 *dst, const u8 *src,
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u16 ethertype, const u8 *data, size_t len, int prot)
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{
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if (ethertype == ETH_P_PAE)
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rx_data_eapol(wt, dst, src, data, len, prot);
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}
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static void rx_data_process(struct wlantest *wt, const u8 *dst, const u8 *src,
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const u8 *data, size_t len, int prot)
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{
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if (len >= 8 && os_memcmp(data, "\xaa\xaa\x03\x00\x00\x00", 6) == 0) {
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rx_data_eth(wt, dst, src, WPA_GET_BE16(data + 6),
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data + 8, len - 8, prot);
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return;
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}
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wpa_hexdump(MSG_DEBUG, "Unrecognized LLC", data, len > 8 ? len : 7);
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}
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static void rx_data_bss_prot(struct wlantest *wt,
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const struct ieee80211_hdr *hdr, const u8 *qos,
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const u8 *dst, const u8 *src, const u8 *data,
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size_t len)
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{
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/* TODO: Try to decrypt and if success, call rx_data_process() with
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* prot = 1 */
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}
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static void rx_data_bss(struct wlantest *wt, const struct ieee80211_hdr *hdr,
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const u8 *qos, const u8 *dst, const u8 *src,
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const u8 *data, size_t len)
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{
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u16 fc = le_to_host16(hdr->frame_control);
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int prot = !!(fc & WLAN_FC_ISWEP);
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if (qos) {
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u8 ack = (qos[0] & 0x60) >> 5;
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wpa_printf(MSG_MSGDUMP, "BSS DATA: " MACSTR " -> " MACSTR
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" len=%u%s tid=%u%s%s",
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MAC2STR(src), MAC2STR(dst), (unsigned int) len,
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prot ? " Prot" : "", qos[0] & 0x0f,
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(qos[0] & 0x10) ? " EOSP" : "",
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ack == 0 ? "" :
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(ack == 1 ? " NoAck" :
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(ack == 2 ? " NoExpAck" : " BA")));
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} else {
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wpa_printf(MSG_MSGDUMP, "BSS DATA: " MACSTR " -> " MACSTR
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" len=%u%s",
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MAC2STR(src), MAC2STR(dst), (unsigned int) len,
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prot ? " Prot" : "");
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}
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if (prot)
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rx_data_bss_prot(wt, hdr, qos, dst, src, data, len);
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else
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rx_data_process(wt, dst, src, data, len, 0);
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}
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void rx_data(struct wlantest *wt, const u8 *data, size_t len)
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{
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const struct ieee80211_hdr *hdr;
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u16 fc;
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u16 fc, stype;
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size_t hdrlen;
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const u8 *qos = NULL;
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if (len < 24)
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return;
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hdr = (const struct ieee80211_hdr *) data;
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fc = le_to_host16(hdr->frame_control);
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stype = WLAN_FC_GET_STYPE(fc);
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hdrlen = 24;
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if ((fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
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(WLAN_FC_TODS | WLAN_FC_FROMDS))
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hdrlen += ETH_ALEN;
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if (stype & 0x08) {
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qos = data + hdrlen;
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hdrlen += 2;
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}
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if (len < hdrlen)
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return;
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wt->rx_data++;
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switch (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) {
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@ -87,6 +382,8 @@ void rx_data(struct wlantest *wt, const u8 *data, size_t len)
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fc & WLAN_FC_ISWEP ? " Prot" : "",
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MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
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MAC2STR(hdr->addr3));
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rx_data_bss(wt, hdr, qos, hdr->addr1, hdr->addr2,
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data + hdrlen, len - hdrlen);
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break;
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case WLAN_FC_TODS:
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wpa_printf(MSG_EXCESSIVE, "DATA %s%s%s ToDS BSSID=" MACSTR
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@ -96,6 +393,8 @@ void rx_data(struct wlantest *wt, const u8 *data, size_t len)
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fc & WLAN_FC_ISWEP ? " Prot" : "",
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MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
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MAC2STR(hdr->addr3));
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rx_data_bss(wt, hdr, qos, hdr->addr3, hdr->addr2,
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data + hdrlen, len - hdrlen);
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break;
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case WLAN_FC_TODS | WLAN_FC_FROMDS:
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wpa_printf(MSG_EXCESSIVE, "DATA %s%s%s WDS RA=" MACSTR " TA="
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