static u8 * try_all_ptk(struct wlantest *wt, int pairwise_cipher,
const struct ieee80211_hdr *hdr,
const u8 *data, size_t data_len, size_t *decrypted_len)
{
struct wlantest_ptk *ptk;
u8 *decrypted;
int prev_level = wpa_debug_level;
wpa_debug_level = MSG_WARNING;
dl_list_for_each(ptk, &wt->ptk, struct wlantest_ptk, list) {
decrypted = NULL;
if ((pairwise_cipher == WPA_CIPHER_CCMP ||
pairwise_cipher == 0) && ptk->ptk_len == 48) {
decrypted = ccmp_decrypt(ptk->ptk.tk1, hdr, data,
data_len, decrypted_len);
}
if ((pairwise_cipher == WPA_CIPHER_TKIP ||
pairwise_cipher == 0) && ptk->ptk_len == 64) {
decrypted = tkip_decrypt(ptk->ptk.tk1, hdr, data,
data_len, decrypted_len);
}
if (decrypted) {
wpa_debug_level = prev_level;
add_note(wt, MSG_DEBUG, "Found PTK match from list of all known PTKs");
return decrypted;
}
}
wpa_debug_level = prev_level;
return NULL;
}
static void test_vector_ccmp(void)
{
u8 tk[] = { 0xc9, 0x7c, 0x1f, 0x67, 0xce, 0x37, 0x11, 0x85,
0x51, 0x4a, 0x8a, 0x19, 0xf2, 0xbd, 0xd5, 0x2f };
u8 pn[] = { 0xB5, 0x03, 0x97, 0x76, 0xE7, 0x0C };
u8 frame[] = {
0x08, 0x48, 0xc3, 0x2c, 0x0f, 0xd2, 0xe1, 0x28,
0xa5, 0x7c, 0x50, 0x30, 0xf1, 0x84, 0x44, 0x08,
0xab, 0xae, 0xa5, 0xb8, 0xfc, 0xba, 0x80, 0x33,
0xf8, 0xba, 0x1a, 0x55, 0xd0, 0x2f, 0x85, 0xae,
0x96, 0x7b, 0xb6, 0x2f, 0xb6, 0xcd, 0xa8, 0xeb,
0x7e, 0x78, 0xa0, 0x50
};
u8 *enc, *plain;
size_t enc_len, plain_len;
u8 fcs[4];
wpa_printf(MSG_INFO, "\nIEEE Std 802.11-2012, M.6.4 CCMP test "
"vector\n");
wpa_hexdump(MSG_INFO, "TK", tk, sizeof(tk));
wpa_hexdump(MSG_INFO, "PN", pn, sizeof(pn));
wpa_hexdump(MSG_INFO, "802.11 Header", frame, 24);
wpa_hexdump(MSG_INFO, "Plaintext Data", frame + 24, sizeof(frame) - 24);
enc = ccmp_encrypt(tk, frame, sizeof(frame), 24, NULL, pn, 0, &enc_len);
if (enc == NULL) {
wpa_printf(MSG_ERROR, "Failed to encrypt CCMP frame");
return;
}
wpa_hexdump(MSG_INFO, "Encrypted MPDU (without FCS)", enc, enc_len);
WPA_PUT_LE32(fcs, crc32(enc, enc_len));
wpa_hexdump(MSG_INFO, "FCS", fcs, sizeof(fcs));
wpa_debug_level = MSG_INFO;
plain = ccmp_decrypt(tk, (const struct ieee80211_hdr *) enc,
enc + 24, enc_len - 24, &plain_len);
wpa_debug_level = MSG_EXCESSIVE;
os_free(enc);
if (plain == NULL) {
wpa_printf(MSG_ERROR, "Failed to decrypt CCMP frame");
return;
}
if (plain_len != sizeof(frame) - 24 ||
os_memcmp(plain, frame + 24, plain_len) != 0) {
wpa_hexdump(MSG_ERROR, "Decryption result did not match",
plain, plain_len);
}
os_free(plain);
}
static void test_vector_ccmp_mgmt(void)
{
u8 tk[] = { 0x66, 0xed, 0x21, 0x04, 0x2f, 0x9f, 0x26, 0xd7,
0x11, 0x57, 0x06, 0xe4, 0x04, 0x14, 0xcf, 0x2e };
u8 pn[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 };
u8 frame[] = {
0xc0, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00,
0x01, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00,
0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x60, 0x00,
0x02, 0x00
};
u8 *enc, *plain;
size_t enc_len, plain_len;
wpa_printf(MSG_INFO, "\nIEEE Std 802.11-2012, M.9.2 CCMP with unicast "
"Deauthentication frame\n");
wpa_hexdump(MSG_INFO, "TK", tk, sizeof(tk));
wpa_hexdump(MSG_INFO, "PN", pn, sizeof(pn));
wpa_hexdump(MSG_INFO, "802.11 Header", frame, 24);
wpa_hexdump(MSG_INFO, "Plaintext Data", frame + 24, sizeof(frame) - 24);
enc = ccmp_encrypt(tk, frame, sizeof(frame), 24, NULL, pn, 0, &enc_len);
if (enc == NULL) {
wpa_printf(MSG_ERROR, "Failed to encrypt CCMP frame");
return;
}
wpa_hexdump(MSG_INFO, "Encrypted MPDU (without FCS)", enc, enc_len);
wpa_debug_level = MSG_INFO;
plain = ccmp_decrypt(tk, (const struct ieee80211_hdr *) enc,
enc + 24, enc_len - 24, &plain_len);
wpa_debug_level = MSG_EXCESSIVE;
os_free(enc);
if (plain == NULL) {
wpa_printf(MSG_ERROR, "Failed to decrypt CCMP frame");
return;
}
if (plain_len != sizeof(frame) - 24 ||
os_memcmp(plain, frame + 24, plain_len) != 0) {
wpa_hexdump(MSG_ERROR, "Decryption result did not match",
plain, plain_len);
}
os_free(plain);
}
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, *found;
const u8 *tk = NULL;
int ptk_iter_done = 0;
int try_ptk_iter = 0;
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);
if (sta)
sta->counters[WLANTEST_STA_COUNTER_PROT_DATA_TX]++;
} 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;
found = NULL;
dl_list_for_each(tdls, &bss->tdls, struct wlantest_tdls, list)
{
if ((tdls->init == sta && tdls->resp == sta2) ||
(tdls->init == sta2 && tdls->resp == sta)) {
found = tdls;
if (tdls->link_up)
break;
}
}
if (found) {
if (!found->link_up)
add_note(wt, MSG_DEBUG,
"TDLS: Link not up, but Data "
"frame seen");
tk = found->tpk.tk;
tdls = found;
}
}
if ((sta == NULL ||
(!sta->ptk_set && sta->pairwise_cipher != WPA_CIPHER_WEP40)) &&
tk == NULL) {
add_note(wt, MSG_MSGDUMP, "No PTK known to decrypt the frame");
if (dl_list_empty(&wt->ptk))
return;
try_ptk_iter = 1;
}
if (len < 4) {
add_note(wt, MSG_INFO, "Too short encrypted data frame");
return;
}
if (sta == NULL)
return;
if (sta->pairwise_cipher & (WPA_CIPHER_TKIP | WPA_CIPHER_CCMP) &&
!(data[3] & 0x20)) {
add_note(wt, 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) {
add_note(wt, MSG_INFO, "TKIP frame from " MACSTR
" used non-zero reserved bit",
MAC2STR(hdr->addr2));
}
if (data[1] != ((data[0] | 0x20) & 0x7f)) {
add_note(wt, 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) {
add_note(wt, MSG_INFO, "CCMP frame from " MACSTR
" used non-zero reserved bit",
MAC2STR(hdr->addr2));
}
}
keyid = data[3] >> 6;
if (keyid != 0) {
add_note(wt, MSG_INFO, "Unexpected non-zero KeyID %d in "
"individually addressed Data frame from " MACSTR,
keyid, MAC2STR(hdr->addr2));
}
if (qos) {
tid = qos[0] & 0x0f;
if (fc & WLAN_FC_TODS)
sta->tx_tid[tid]++;
else
sta->rx_tid[tid]++;
} else {
tid = 0;
if (fc & WLAN_FC_TODS)
sta->tx_tid[16]++;
else
sta->rx_tid[16]++;
}
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 if (sta->pairwise_cipher == WPA_CIPHER_WEP40)
goto skip_replay_det;
else
ccmp_get_pn(pn, data);
if (os_memcmp(pn, rsc, 6) <= 0) {
u16 seq_ctrl = le_to_host16(hdr->seq_ctrl);
add_note(wt, MSG_INFO, "CCMP/TKIP replay detected: A1=" MACSTR
" A2=" MACSTR " A3=" MACSTR " seq=%u frag=%u",
MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
MAC2STR(hdr->addr3),
WLAN_GET_SEQ_SEQ(seq_ctrl),
WLAN_GET_SEQ_FRAG(seq_ctrl));
wpa_hexdump(MSG_INFO, "RX PN", pn, 6);
wpa_hexdump(MSG_INFO, "RSC", rsc, 6);
}
skip_replay_det:
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 if (sta->pairwise_cipher == WPA_CIPHER_WEP40)
decrypted = wep_decrypt(wt, hdr, data, len, &dlen);
else if (sta->ptk_set)
decrypted = ccmp_decrypt(sta->ptk.tk1, hdr, data, len, &dlen);
else {
decrypted = try_all_ptk(wt, sta->pairwise_cipher, hdr, data,
len, &dlen);
ptk_iter_done = 1;
}
if (!decrypted && !ptk_iter_done) {
decrypted = try_all_ptk(wt, sta->pairwise_cipher, hdr, data,
len, &dlen);
if (decrypted) {
add_note(wt, MSG_DEBUG, "Current PTK did not work, but found a match from all known PTKs");
}
}
if (decrypted) {
u16 fc = le_to_host16(hdr->frame_control);
const u8 *peer_addr = NULL;
if (!(fc & (WLAN_FC_FROMDS | WLAN_FC_TODS)))
peer_addr = hdr->addr1;
os_memcpy(rsc, pn, 6);
rx_data_process(wt, bss->bssid, sta->addr, dst, src, decrypted,
dlen, 1, peer_addr);
write_pcap_decrypted(wt, (const u8 *) hdr, 24 + (qos ? 2 : 0),
decrypted, dlen);
} else if (!try_ptk_iter)
add_note(wt, MSG_DEBUG, "Failed to decrypt frame");
os_free(decrypted);
}
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) {
add_note(wt, MSG_INFO, "Too short group addressed data frame");
return;
}
if (bss->group_cipher & (WPA_CIPHER_TKIP | WPA_CIPHER_CCMP) &&
!(data[3] & 0x20)) {
add_note(wt, 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) {
add_note(wt, MSG_INFO, "TKIP frame from " MACSTR
" used non-zero reserved bit",
MAC2STR(bss->bssid));
}
if (data[1] != ((data[0] | 0x20) & 0x7f)) {
add_note(wt, 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) {
add_note(wt, MSG_INFO, "CCMP frame from " MACSTR
" used non-zero reserved bit",
MAC2STR(bss->bssid));
}
}
keyid = data[3] >> 6;
if (bss->gtk_len[keyid] == 0 && bss->group_cipher != WPA_CIPHER_WEP40)
{
add_note(wt, 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 if (bss->group_cipher == WPA_CIPHER_WEP40)
goto skip_replay_det;
else
ccmp_get_pn(pn, data);
if (os_memcmp(pn, bss->rsc[keyid], 6) <= 0) {
u16 seq_ctrl = le_to_host16(hdr->seq_ctrl);
add_note(wt, MSG_INFO, "CCMP/TKIP replay detected: A1=" MACSTR
" A2=" MACSTR " A3=" MACSTR " seq=%u frag=%u",
MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
MAC2STR(hdr->addr3),
WLAN_GET_SEQ_SEQ(seq_ctrl),
WLAN_GET_SEQ_FRAG(seq_ctrl));
wpa_hexdump(MSG_INFO, "RX PN", pn, 6);
wpa_hexdump(MSG_INFO, "RSC", bss->rsc[keyid], 6);
}
skip_replay_det:
if (bss->group_cipher == WPA_CIPHER_TKIP)
decrypted = tkip_decrypt(bss->gtk[keyid], hdr, data, len,
&dlen);
else if (bss->group_cipher == WPA_CIPHER_WEP40)
decrypted = wep_decrypt(wt, 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, NULL);
os_memcpy(bss->rsc[keyid], pn, 6);
write_pcap_decrypted(wt, (const u8 *) hdr, 24 + (qos ? 2 : 0),
decrypted, dlen);
} else
add_note(wt, MSG_DEBUG, "Failed to decrypt frame");
os_free(decrypted);
}