387 lines
9.6 KiB
C
387 lines
9.6 KiB
C
/*
|
|
* CTR with CBC-MAC Protocol (CCMP)
|
|
* Copyright (c) 2010-2012, 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 "common/ieee802_11_defs.h"
|
|
#include "crypto/aes.h"
|
|
#include "crypto/aes_wrap.h"
|
|
#include "wlantest.h"
|
|
|
|
|
|
static void ccmp_aad_nonce(const struct ieee80211_hdr *hdr, const u8 *data,
|
|
const u8 *a1, const u8 *a2, const u8 *a3,
|
|
u8 *aad, size_t *aad_len, u8 *nonce)
|
|
{
|
|
u16 fc, stype, seq;
|
|
int qos = 0, addr4 = 0;
|
|
u8 *pos;
|
|
|
|
nonce[0] = 0;
|
|
|
|
fc = le_to_host16(hdr->frame_control);
|
|
stype = WLAN_FC_GET_STYPE(fc);
|
|
if ((fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
|
|
(WLAN_FC_TODS | WLAN_FC_FROMDS))
|
|
addr4 = 1;
|
|
|
|
if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA) {
|
|
fc &= ~0x0070; /* Mask subtype bits */
|
|
if (stype & 0x08) {
|
|
const u8 *qc;
|
|
qos = 1;
|
|
fc &= ~WLAN_FC_HTC;
|
|
qc = (const u8 *) (hdr + 1);
|
|
if (addr4)
|
|
qc += ETH_ALEN;
|
|
nonce[0] = qc[0] & 0x0f;
|
|
}
|
|
} else if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT)
|
|
nonce[0] |= 0x10; /* Management */
|
|
|
|
fc &= ~(WLAN_FC_RETRY | WLAN_FC_PWRMGT | WLAN_FC_MOREDATA);
|
|
fc |= WLAN_FC_ISWEP;
|
|
WPA_PUT_LE16(aad, fc);
|
|
pos = aad + 2;
|
|
os_memcpy(pos, hdr->addr1, 3 * ETH_ALEN);
|
|
if (a1)
|
|
os_memcpy(pos, a1, ETH_ALEN);
|
|
if (a2)
|
|
os_memcpy(pos + ETH_ALEN, a2, ETH_ALEN);
|
|
if (a3)
|
|
os_memcpy(pos + 2 * ETH_ALEN, a3, ETH_ALEN);
|
|
pos += 3 * ETH_ALEN;
|
|
seq = le_to_host16(hdr->seq_ctrl);
|
|
seq &= ~0xfff0; /* Mask Seq#; do not modify Frag# */
|
|
WPA_PUT_LE16(pos, seq);
|
|
pos += 2;
|
|
|
|
os_memcpy(pos, hdr + 1, addr4 * ETH_ALEN + qos * 2);
|
|
pos += addr4 * ETH_ALEN;
|
|
if (qos) {
|
|
pos[0] &= ~0x70;
|
|
if (1 /* FIX: either device has SPP A-MSDU Capab = 0 */)
|
|
pos[0] &= ~0x80;
|
|
pos++;
|
|
*pos++ = 0x00;
|
|
}
|
|
|
|
*aad_len = pos - aad;
|
|
|
|
if (a2)
|
|
os_memcpy(nonce + 1, a2, ETH_ALEN);
|
|
else
|
|
os_memcpy(nonce + 1, hdr->addr2, ETH_ALEN);
|
|
nonce[7] = data[7]; /* PN5 */
|
|
nonce[8] = data[6]; /* PN4 */
|
|
nonce[9] = data[5]; /* PN3 */
|
|
nonce[10] = data[4]; /* PN2 */
|
|
nonce[11] = data[1]; /* PN1 */
|
|
nonce[12] = data[0]; /* PN0 */
|
|
}
|
|
|
|
|
|
static void ccmp_aad_nonce_pv1(const u8 *hdr, const u8 *a1, const u8 *a2,
|
|
const u8 *a3, const u8 *pn,
|
|
u8 *aad, size_t *aad_len, u8 *nonce)
|
|
{
|
|
u16 fc, type, ptid;
|
|
u8 *pos;
|
|
|
|
nonce[0] = BIT(5); /* PV1 */
|
|
/* TODO: Priority for QMF; 0 is used for Data frames */
|
|
|
|
fc = WPA_GET_LE16(hdr);
|
|
type = (fc & (BIT(2) | BIT(3) | BIT(4))) >> 2;
|
|
|
|
if (type == 1)
|
|
nonce[0] |= 0x10; /* Management */
|
|
else if ((type == 0) || (type == 3)) {
|
|
/* QoS Data */
|
|
ptid = (fc & (BIT(5) | BIT(6) | BIT(7))) >> 5;
|
|
nonce[0] |= ptid;
|
|
}
|
|
|
|
fc &= ~(BIT(10) | BIT(11) | BIT(13) | BIT(14) | BIT(15));
|
|
fc |= BIT(12);
|
|
WPA_PUT_LE16(aad, fc);
|
|
pos = aad + 2;
|
|
if (type == 0 || type == 3) {
|
|
const u8 *sc;
|
|
|
|
os_memcpy(pos, a1, ETH_ALEN);
|
|
pos += ETH_ALEN;
|
|
os_memcpy(pos, a2, ETH_ALEN);
|
|
pos += ETH_ALEN;
|
|
|
|
if (type == 0) {
|
|
/* Either A1 or A2 contains SID */
|
|
sc = hdr + 2 + 2 + ETH_ALEN;
|
|
} else {
|
|
/* Both A1 and A2 contain full addresses */
|
|
sc = hdr + 2 + 2 * ETH_ALEN;
|
|
}
|
|
/* SC with Sequence Number subfield (bits 4-15 of the Sequence
|
|
* Control field) masked to 0. */
|
|
*pos++ = *sc & 0x0f;
|
|
*pos++ = 0;
|
|
|
|
if (a3) {
|
|
os_memcpy(pos, a3, ETH_ALEN);
|
|
pos += ETH_ALEN;
|
|
}
|
|
}
|
|
|
|
*aad_len = pos - aad;
|
|
|
|
os_memcpy(nonce + 1, a2, ETH_ALEN);
|
|
nonce[7] = pn[5]; /* PN5 */
|
|
nonce[8] = pn[4]; /* PN4 */
|
|
nonce[9] = pn[3]; /* PN3 */
|
|
nonce[10] = pn[2]; /* PN2 */
|
|
nonce[11] = pn[1]; /* PN1 */
|
|
nonce[12] = pn[0]; /* PN0 */
|
|
}
|
|
|
|
|
|
u8 * ccmp_decrypt(const u8 *tk, const struct ieee80211_hdr *hdr,
|
|
const u8 *a1, const u8 *a2, const u8 *a3,
|
|
const u8 *data, size_t data_len,
|
|
size_t *decrypted_len)
|
|
{
|
|
u8 aad[30], nonce[13];
|
|
size_t aad_len;
|
|
size_t mlen;
|
|
u8 *plain;
|
|
|
|
if (data_len < 8 + 8)
|
|
return NULL;
|
|
|
|
plain = os_malloc(data_len + AES_BLOCK_SIZE);
|
|
if (plain == NULL)
|
|
return NULL;
|
|
|
|
mlen = data_len - 8 - 8;
|
|
|
|
os_memset(aad, 0, sizeof(aad));
|
|
ccmp_aad_nonce(hdr, data, a1, a2, a3, aad, &aad_len, nonce);
|
|
wpa_hexdump(MSG_EXCESSIVE, "CCMP AAD", aad, aad_len);
|
|
wpa_hexdump(MSG_EXCESSIVE, "CCM Nonce", nonce, 13);
|
|
|
|
if (aes_ccm_ad(tk, 16, nonce, 8, data + 8, mlen, aad, aad_len,
|
|
data + 8 + mlen, plain) < 0) {
|
|
u16 seq_ctrl = le_to_host16(hdr->seq_ctrl);
|
|
wpa_printf(MSG_INFO, "Invalid CCMP MIC in frame: 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));
|
|
os_free(plain);
|
|
return NULL;
|
|
}
|
|
wpa_hexdump(MSG_EXCESSIVE, "CCMP decrypted", plain, mlen);
|
|
|
|
*decrypted_len = mlen;
|
|
return plain;
|
|
}
|
|
|
|
|
|
void ccmp_get_pn(u8 *pn, const u8 *data)
|
|
{
|
|
pn[0] = data[7]; /* PN5 */
|
|
pn[1] = data[6]; /* PN4 */
|
|
pn[2] = data[5]; /* PN3 */
|
|
pn[3] = data[4]; /* PN2 */
|
|
pn[4] = data[1]; /* PN1 */
|
|
pn[5] = data[0]; /* PN0 */
|
|
}
|
|
|
|
|
|
u8 * ccmp_encrypt(const u8 *tk, u8 *frame, size_t len, size_t hdrlen,
|
|
const u8 *qos, const u8 *a1, const u8 *a2, const u8 *a3,
|
|
const u8 *pn, int keyid, size_t *encrypted_len)
|
|
{
|
|
u8 aad[30], nonce[13];
|
|
size_t aad_len, plen;
|
|
u8 *crypt, *pos;
|
|
struct ieee80211_hdr *hdr;
|
|
|
|
if (len < hdrlen || hdrlen < 24)
|
|
return NULL;
|
|
plen = len - hdrlen;
|
|
|
|
crypt = os_malloc(hdrlen + 8 + plen + 8 + AES_BLOCK_SIZE);
|
|
if (crypt == NULL)
|
|
return NULL;
|
|
|
|
os_memcpy(crypt, frame, hdrlen);
|
|
hdr = (struct ieee80211_hdr *) crypt;
|
|
hdr->frame_control |= host_to_le16(WLAN_FC_ISWEP);
|
|
pos = crypt + hdrlen;
|
|
*pos++ = pn[5]; /* PN0 */
|
|
*pos++ = pn[4]; /* PN1 */
|
|
*pos++ = 0x00; /* Rsvd */
|
|
*pos++ = 0x20 | (keyid << 6);
|
|
*pos++ = pn[3]; /* PN2 */
|
|
*pos++ = pn[2]; /* PN3 */
|
|
*pos++ = pn[1]; /* PN4 */
|
|
*pos++ = pn[0]; /* PN5 */
|
|
|
|
os_memset(aad, 0, sizeof(aad));
|
|
ccmp_aad_nonce(hdr, crypt + hdrlen, a1, a2, a3, aad, &aad_len, nonce);
|
|
wpa_hexdump(MSG_EXCESSIVE, "CCMP AAD", aad, aad_len);
|
|
wpa_hexdump(MSG_EXCESSIVE, "CCM Nonce", nonce, 13);
|
|
|
|
if (aes_ccm_ae(tk, 16, nonce, 8, frame + hdrlen, plen, aad, aad_len,
|
|
pos, pos + plen) < 0) {
|
|
os_free(crypt);
|
|
return NULL;
|
|
}
|
|
|
|
wpa_hexdump(MSG_EXCESSIVE, "CCMP encrypted", crypt + hdrlen + 8, plen);
|
|
|
|
*encrypted_len = hdrlen + 8 + plen + 8;
|
|
|
|
return crypt;
|
|
}
|
|
|
|
|
|
u8 * ccmp_encrypt_pv1(const u8 *tk, const u8 *a1, const u8 *a2, const u8 *a3,
|
|
const u8 *frame, size_t len,
|
|
size_t hdrlen, const u8 *pn, int keyid,
|
|
size_t *encrypted_len)
|
|
{
|
|
u8 aad[24], nonce[13];
|
|
size_t aad_len, plen;
|
|
u8 *crypt, *pos;
|
|
struct ieee80211_hdr *hdr;
|
|
|
|
if (len < hdrlen || hdrlen < 12)
|
|
return NULL;
|
|
plen = len - hdrlen;
|
|
|
|
crypt = os_malloc(hdrlen + plen + 8 + AES_BLOCK_SIZE);
|
|
if (crypt == NULL)
|
|
return NULL;
|
|
|
|
os_memcpy(crypt, frame, hdrlen);
|
|
hdr = (struct ieee80211_hdr *) crypt;
|
|
hdr->frame_control |= host_to_le16(BIT(12)); /* Protected Frame */
|
|
pos = crypt + hdrlen;
|
|
|
|
os_memset(aad, 0, sizeof(aad));
|
|
ccmp_aad_nonce_pv1(crypt, a1, a2, a3, pn, aad, &aad_len, nonce);
|
|
wpa_hexdump(MSG_EXCESSIVE, "CCMP AAD", aad, aad_len);
|
|
wpa_hexdump(MSG_EXCESSIVE, "CCM Nonce", nonce, sizeof(nonce));
|
|
|
|
if (aes_ccm_ae(tk, 16, nonce, 8, frame + hdrlen, plen, aad, aad_len,
|
|
pos, pos + plen) < 0) {
|
|
os_free(crypt);
|
|
return NULL;
|
|
}
|
|
|
|
wpa_hexdump(MSG_EXCESSIVE, "CCMP encrypted", crypt + hdrlen, plen);
|
|
|
|
*encrypted_len = hdrlen + plen + 8;
|
|
|
|
return crypt;
|
|
}
|
|
|
|
|
|
u8 * ccmp_256_decrypt(const u8 *tk, const struct ieee80211_hdr *hdr,
|
|
const u8 *a1, const u8 *a2, const u8 *a3,
|
|
const u8 *data, size_t data_len, size_t *decrypted_len)
|
|
{
|
|
u8 aad[30], nonce[13];
|
|
size_t aad_len;
|
|
size_t mlen;
|
|
u8 *plain;
|
|
|
|
if (data_len < 8 + 16)
|
|
return NULL;
|
|
|
|
plain = os_malloc(data_len + AES_BLOCK_SIZE);
|
|
if (plain == NULL)
|
|
return NULL;
|
|
|
|
mlen = data_len - 8 - 16;
|
|
|
|
os_memset(aad, 0, sizeof(aad));
|
|
ccmp_aad_nonce(hdr, data, a1, a2, a3, aad, &aad_len, nonce);
|
|
wpa_hexdump(MSG_EXCESSIVE, "CCMP-256 AAD", aad, aad_len);
|
|
wpa_hexdump(MSG_EXCESSIVE, "CCMP-256 nonce", nonce, 13);
|
|
|
|
if (aes_ccm_ad(tk, 32, nonce, 16, data + 8, mlen, aad, aad_len,
|
|
data + 8 + mlen, plain) < 0) {
|
|
u16 seq_ctrl = le_to_host16(hdr->seq_ctrl);
|
|
wpa_printf(MSG_INFO, "Invalid CCMP-256 MIC in frame: 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));
|
|
os_free(plain);
|
|
return NULL;
|
|
}
|
|
wpa_hexdump(MSG_EXCESSIVE, "CCMP-256 decrypted", plain, mlen);
|
|
|
|
*decrypted_len = mlen;
|
|
return plain;
|
|
}
|
|
|
|
|
|
u8 * ccmp_256_encrypt(const u8 *tk, u8 *frame, size_t len, size_t hdrlen,
|
|
const u8 *qos, const u8 *a1, const u8 *a2, const u8 *a3,
|
|
const u8 *pn, int keyid, size_t *encrypted_len)
|
|
{
|
|
u8 aad[30], nonce[13];
|
|
size_t aad_len, plen;
|
|
u8 *crypt, *pos;
|
|
struct ieee80211_hdr *hdr;
|
|
|
|
if (len < hdrlen || hdrlen < 24)
|
|
return NULL;
|
|
plen = len - hdrlen;
|
|
|
|
crypt = os_malloc(hdrlen + 8 + plen + 16 + AES_BLOCK_SIZE);
|
|
if (crypt == NULL)
|
|
return NULL;
|
|
|
|
os_memcpy(crypt, frame, hdrlen);
|
|
hdr = (struct ieee80211_hdr *) crypt;
|
|
hdr->frame_control |= host_to_le16(WLAN_FC_ISWEP);
|
|
pos = crypt + hdrlen;
|
|
*pos++ = pn[5]; /* PN0 */
|
|
*pos++ = pn[4]; /* PN1 */
|
|
*pos++ = 0x00; /* Rsvd */
|
|
*pos++ = 0x20 | (keyid << 6);
|
|
*pos++ = pn[3]; /* PN2 */
|
|
*pos++ = pn[2]; /* PN3 */
|
|
*pos++ = pn[1]; /* PN4 */
|
|
*pos++ = pn[0]; /* PN5 */
|
|
|
|
os_memset(aad, 0, sizeof(aad));
|
|
ccmp_aad_nonce(hdr, crypt + hdrlen, a1, a2, a3, aad, &aad_len, nonce);
|
|
wpa_hexdump(MSG_EXCESSIVE, "CCMP-256 AAD", aad, aad_len);
|
|
wpa_hexdump(MSG_EXCESSIVE, "CCMP-256 nonce", nonce, 13);
|
|
|
|
if (aes_ccm_ae(tk, 32, nonce, 16, frame + hdrlen, plen, aad, aad_len,
|
|
pos, pos + plen) < 0) {
|
|
os_free(crypt);
|
|
return NULL;
|
|
}
|
|
|
|
wpa_hexdump(MSG_EXCESSIVE, "CCMP-256 encrypted", crypt + hdrlen + 8,
|
|
plen);
|
|
|
|
*encrypted_len = hdrlen + 8 + plen + 16;
|
|
|
|
return crypt;
|
|
}
|