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fragattacks/wlantest/tkip.c
Johannes Berg a1f11e34c4 Use os_memdup() 
This leads to cleaner code overall, and also reduces the size
of the hostapd and wpa_supplicant binaries (in hwsim test build
on x86_64) by about 2.5 and 3.5KiB respectively.

The mechanical conversions all over the code were done with
the following spatch:

    @@
    expression SIZE, SRC;
    expression a;
    @@
    -a = os_malloc(SIZE);
    +a = os_memdup(SRC, SIZE);
    <...
    if (!a) {...}
    ...>
    -os_memcpy(a, SRC, SIZE);

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2017-03-07 13:19:10 +02:00

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/*
* Temporal Key Integrity Protocol (CCMP)
* Copyright (c) 2010, 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 "utils/crc32.h"
#include "common/ieee802_11_defs.h"
#include "wlantest.h"
void wep_crypt(u8 *key, u8 *buf, size_t plen);
static inline u16 RotR1(u16 val)
{
return (val >> 1) | (val << 15);
}
static inline u8 Lo8(u16 val)
{
return val & 0xff;
}
static inline u8 Hi8(u16 val)
{
return val >> 8;
}
static inline u16 Lo16(u32 val)
{
return val & 0xffff;
}
static inline u16 Hi16(u32 val)
{
return val >> 16;
}
static inline u16 Mk16(u8 hi, u8 lo)
{
return lo | (((u16) hi) << 8);
}
static inline u16 Mk16_le(u16 *v)
{
return le_to_host16(*v);
}
static const u16 Sbox[256] =
{
0xC6A5, 0xF884, 0xEE99, 0xF68D, 0xFF0D, 0xD6BD, 0xDEB1, 0x9154,
0x6050, 0x0203, 0xCEA9, 0x567D, 0xE719, 0xB562, 0x4DE6, 0xEC9A,
0x8F45, 0x1F9D, 0x8940, 0xFA87, 0xEF15, 0xB2EB, 0x8EC9, 0xFB0B,
0x41EC, 0xB367, 0x5FFD, 0x45EA, 0x23BF, 0x53F7, 0xE496, 0x9B5B,
0x75C2, 0xE11C, 0x3DAE, 0x4C6A, 0x6C5A, 0x7E41, 0xF502, 0x834F,
0x685C, 0x51F4, 0xD134, 0xF908, 0xE293, 0xAB73, 0x6253, 0x2A3F,
0x080C, 0x9552, 0x4665, 0x9D5E, 0x3028, 0x37A1, 0x0A0F, 0x2FB5,
0x0E09, 0x2436, 0x1B9B, 0xDF3D, 0xCD26, 0x4E69, 0x7FCD, 0xEA9F,
0x121B, 0x1D9E, 0x5874, 0x342E, 0x362D, 0xDCB2, 0xB4EE, 0x5BFB,
0xA4F6, 0x764D, 0xB761, 0x7DCE, 0x527B, 0xDD3E, 0x5E71, 0x1397,
0xA6F5, 0xB968, 0x0000, 0xC12C, 0x4060, 0xE31F, 0x79C8, 0xB6ED,
0xD4BE, 0x8D46, 0x67D9, 0x724B, 0x94DE, 0x98D4, 0xB0E8, 0x854A,
0xBB6B, 0xC52A, 0x4FE5, 0xED16, 0x86C5, 0x9AD7, 0x6655, 0x1194,
0x8ACF, 0xE910, 0x0406, 0xFE81, 0xA0F0, 0x7844, 0x25BA, 0x4BE3,
0xA2F3, 0x5DFE, 0x80C0, 0x058A, 0x3FAD, 0x21BC, 0x7048, 0xF104,
0x63DF, 0x77C1, 0xAF75, 0x4263, 0x2030, 0xE51A, 0xFD0E, 0xBF6D,
0x814C, 0x1814, 0x2635, 0xC32F, 0xBEE1, 0x35A2, 0x88CC, 0x2E39,
0x9357, 0x55F2, 0xFC82, 0x7A47, 0xC8AC, 0xBAE7, 0x322B, 0xE695,
0xC0A0, 0x1998, 0x9ED1, 0xA37F, 0x4466, 0x547E, 0x3BAB, 0x0B83,
0x8CCA, 0xC729, 0x6BD3, 0x283C, 0xA779, 0xBCE2, 0x161D, 0xAD76,
0xDB3B, 0x6456, 0x744E, 0x141E, 0x92DB, 0x0C0A, 0x486C, 0xB8E4,
0x9F5D, 0xBD6E, 0x43EF, 0xC4A6, 0x39A8, 0x31A4, 0xD337, 0xF28B,
0xD532, 0x8B43, 0x6E59, 0xDAB7, 0x018C, 0xB164, 0x9CD2, 0x49E0,
0xD8B4, 0xACFA, 0xF307, 0xCF25, 0xCAAF, 0xF48E, 0x47E9, 0x1018,
0x6FD5, 0xF088, 0x4A6F, 0x5C72, 0x3824, 0x57F1, 0x73C7, 0x9751,
0xCB23, 0xA17C, 0xE89C, 0x3E21, 0x96DD, 0x61DC, 0x0D86, 0x0F85,
0xE090, 0x7C42, 0x71C4, 0xCCAA, 0x90D8, 0x0605, 0xF701, 0x1C12,
0xC2A3, 0x6A5F, 0xAEF9, 0x69D0, 0x1791, 0x9958, 0x3A27, 0x27B9,
0xD938, 0xEB13, 0x2BB3, 0x2233, 0xD2BB, 0xA970, 0x0789, 0x33A7,
0x2DB6, 0x3C22, 0x1592, 0xC920, 0x8749, 0xAAFF, 0x5078, 0xA57A,
0x038F, 0x59F8, 0x0980, 0x1A17, 0x65DA, 0xD731, 0x84C6, 0xD0B8,
0x82C3, 0x29B0, 0x5A77, 0x1E11, 0x7BCB, 0xA8FC, 0x6DD6, 0x2C3A,
};
static inline u16 _S_(u16 v)
{
u16 t = Sbox[Hi8(v)];
return Sbox[Lo8(v)] ^ ((t << 8) | (t >> 8));
}
#define PHASE1_LOOP_COUNT 8
static void tkip_mixing_phase1(u16 *TTAK, const u8 *TK, const u8 *TA, u32 IV32)
{
int i, j;
/* Initialize the 80-bit TTAK from TSC (IV32) and TA[0..5] */
TTAK[0] = Lo16(IV32);
TTAK[1] = Hi16(IV32);
TTAK[2] = Mk16(TA[1], TA[0]);
TTAK[3] = Mk16(TA[3], TA[2]);
TTAK[4] = Mk16(TA[5], TA[4]);
for (i = 0; i < PHASE1_LOOP_COUNT; i++) {
j = 2 * (i & 1);
TTAK[0] += _S_(TTAK[4] ^ Mk16(TK[1 + j], TK[0 + j]));
TTAK[1] += _S_(TTAK[0] ^ Mk16(TK[5 + j], TK[4 + j]));
TTAK[2] += _S_(TTAK[1] ^ Mk16(TK[9 + j], TK[8 + j]));
TTAK[3] += _S_(TTAK[2] ^ Mk16(TK[13 + j], TK[12 + j]));
TTAK[4] += _S_(TTAK[3] ^ Mk16(TK[1 + j], TK[0 + j])) + i;
}
}
static void tkip_mixing_phase2(u8 *WEPSeed, const u8 *TK, const u16 *TTAK,
u16 IV16)
{
u16 PPK[6];
/* Step 1 - make copy of TTAK and bring in TSC */
PPK[0] = TTAK[0];
PPK[1] = TTAK[1];
PPK[2] = TTAK[2];
PPK[3] = TTAK[3];
PPK[4] = TTAK[4];
PPK[5] = TTAK[4] + IV16;
/* Step 2 - 96-bit bijective mixing using S-box */
PPK[0] += _S_(PPK[5] ^ Mk16_le((u16 *) &TK[0]));
PPK[1] += _S_(PPK[0] ^ Mk16_le((u16 *) &TK[2]));
PPK[2] += _S_(PPK[1] ^ Mk16_le((u16 *) &TK[4]));
PPK[3] += _S_(PPK[2] ^ Mk16_le((u16 *) &TK[6]));
PPK[4] += _S_(PPK[3] ^ Mk16_le((u16 *) &TK[8]));
PPK[5] += _S_(PPK[4] ^ Mk16_le((u16 *) &TK[10]));
PPK[0] += RotR1(PPK[5] ^ Mk16_le((u16 *) &TK[12]));
PPK[1] += RotR1(PPK[0] ^ Mk16_le((u16 *) &TK[14]));
PPK[2] += RotR1(PPK[1]);
PPK[3] += RotR1(PPK[2]);
PPK[4] += RotR1(PPK[3]);
PPK[5] += RotR1(PPK[4]);
/* Step 3 - bring in last of TK bits, assign 24-bit WEP IV value
* WEPSeed[0..2] is transmitted as WEP IV */
WEPSeed[0] = Hi8(IV16);
WEPSeed[1] = (Hi8(IV16) | 0x20) & 0x7F;
WEPSeed[2] = Lo8(IV16);
WEPSeed[3] = Lo8((PPK[5] ^ Mk16_le((u16 *) &TK[0])) >> 1);
WPA_PUT_LE16(&WEPSeed[4], PPK[0]);
WPA_PUT_LE16(&WEPSeed[6], PPK[1]);
WPA_PUT_LE16(&WEPSeed[8], PPK[2]);
WPA_PUT_LE16(&WEPSeed[10], PPK[3]);
WPA_PUT_LE16(&WEPSeed[12], PPK[4]);
WPA_PUT_LE16(&WEPSeed[14], PPK[5]);
}
static inline u32 rotl(u32 val, int bits)
{
return (val << bits) | (val >> (32 - bits));
}
static inline u32 rotr(u32 val, int bits)
{
return (val >> bits) | (val << (32 - bits));
}
static inline u32 xswap(u32 val)
{
return ((val & 0x00ff00ff) << 8) | ((val & 0xff00ff00) >> 8);
}
#define michael_block(l, r) \
do { \
r ^= rotl(l, 17); \
l += r; \
r ^= xswap(l); \
l += r; \
r ^= rotl(l, 3); \
l += r; \
r ^= rotr(l, 2); \
l += r; \
} while (0)
static void michael_mic(const u8 *key, const u8 *hdr, const u8 *data,
size_t data_len, u8 *mic)
{
u32 l, r;
int i, blocks, last;
l = WPA_GET_LE32(key);
r = WPA_GET_LE32(key + 4);
/* Michael MIC pseudo header: DA, SA, 3 x 0, Priority */
l ^= WPA_GET_LE32(hdr);
michael_block(l, r);
l ^= WPA_GET_LE32(&hdr[4]);
michael_block(l, r);
l ^= WPA_GET_LE32(&hdr[8]);
michael_block(l, r);
l ^= WPA_GET_LE32(&hdr[12]);
michael_block(l, r);
/* 32-bit blocks of data */
blocks = data_len / 4;
last = data_len % 4;
for (i = 0; i < blocks; i++) {
l ^= WPA_GET_LE32(&data[4 * i]);
michael_block(l, r);
}
/* Last block and padding (0x5a, 4..7 x 0) */
switch (last) {
case 0:
l ^= 0x5a;
break;
case 1:
l ^= data[4 * i] | 0x5a00;
break;
case 2:
l ^= data[4 * i] | (data[4 * i + 1] << 8) | 0x5a0000;
break;
case 3:
l ^= data[4 * i] | (data[4 * i + 1] << 8) |
(data[4 * i + 2] << 16) | 0x5a000000;
break;
}
michael_block(l, r);
/* l ^= 0; */
michael_block(l, r);
WPA_PUT_LE32(mic, l);
WPA_PUT_LE32(mic + 4, r);
}
static void michael_mic_hdr(const struct ieee80211_hdr *hdr11, u8 *hdr)
{
int hdrlen = 24;
u16 fc = le_to_host16(hdr11->frame_control);
switch (fc & (WLAN_FC_FROMDS | WLAN_FC_TODS)) {
case WLAN_FC_TODS:
os_memcpy(hdr, hdr11->addr3, ETH_ALEN); /* DA */
os_memcpy(hdr + ETH_ALEN, hdr11->addr2, ETH_ALEN); /* SA */
break;
case WLAN_FC_FROMDS:
os_memcpy(hdr, hdr11->addr1, ETH_ALEN); /* DA */
os_memcpy(hdr + ETH_ALEN, hdr11->addr3, ETH_ALEN); /* SA */
break;
case WLAN_FC_FROMDS | WLAN_FC_TODS:
os_memcpy(hdr, hdr11->addr3, ETH_ALEN); /* DA */
os_memcpy(hdr + ETH_ALEN, hdr11 + 1, ETH_ALEN); /* SA */
hdrlen += ETH_ALEN;
break;
case 0:
os_memcpy(hdr, hdr11->addr1, ETH_ALEN); /* DA */
os_memcpy(hdr + ETH_ALEN, hdr11->addr2, ETH_ALEN); /* SA */
break;
}
if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA &&
(WLAN_FC_GET_STYPE(fc) & 0x08)) {
const u8 *qos = ((const u8 *) hdr11) + hdrlen;
hdr[12] = qos[0] & 0x0f; /* priority */
} else
hdr[12] = 0; /* priority */
hdr[13] = hdr[14] = hdr[15] = 0; /* reserved */
}
u8 * tkip_decrypt(const u8 *tk, const struct ieee80211_hdr *hdr,
const u8 *data, size_t data_len, size_t *decrypted_len)
{
u16 iv16;
u32 iv32;
u16 ttak[5];
u8 rc4key[16];
u8 *plain;
size_t plain_len;
u32 icv, rx_icv;
const u8 *mic_key;
u8 michael_hdr[16];
u8 mic[8];
u16 fc = le_to_host16(hdr->frame_control);
if (data_len < 8 + 4)
return NULL;
iv16 = (data[0] << 8) | data[2];
iv32 = WPA_GET_LE32(&data[4]);
wpa_printf(MSG_EXCESSIVE, "TKIP decrypt: iv32=%08x iv16=%04x",
iv32, iv16);
tkip_mixing_phase1(ttak, tk, hdr->addr2, iv32);
wpa_hexdump(MSG_EXCESSIVE, "TKIP TTAK", (u8 *) ttak, sizeof(ttak));
tkip_mixing_phase2(rc4key, tk, ttak, iv16);
wpa_hexdump(MSG_EXCESSIVE, "TKIP RC4KEY", rc4key, sizeof(rc4key));
plain_len = data_len - 8;
plain = os_memdup(data + 8, plain_len);
if (plain == NULL)
return NULL;
wep_crypt(rc4key, plain, plain_len);
icv = crc32(plain, plain_len - 4);
rx_icv = WPA_GET_LE32(plain + plain_len - 4);
if (icv != rx_icv) {
wpa_printf(MSG_INFO, "TKIP ICV mismatch in frame from " MACSTR,
MAC2STR(hdr->addr2));
wpa_printf(MSG_DEBUG, "TKIP calculated ICV %08x received ICV "
"%08x", icv, rx_icv);
os_free(plain);
return NULL;
}
plain_len -= 4;
/* TODO: MSDU reassembly */
if (plain_len < 8) {
wpa_printf(MSG_INFO, "TKIP: Not enough room for Michael MIC "
"in a frame from " MACSTR, MAC2STR(hdr->addr2));
os_free(plain);
return NULL;
}
michael_mic_hdr(hdr, michael_hdr);
mic_key = tk + ((fc & WLAN_FC_FROMDS) ? 16 : 24);
michael_mic(mic_key, michael_hdr, plain, plain_len - 8, mic);
if (os_memcmp(mic, plain + plain_len - 8, 8) != 0) {
wpa_printf(MSG_INFO, "TKIP: Michael MIC mismatch in a frame "
"from " MACSTR, MAC2STR(hdr->addr2));
wpa_hexdump(MSG_DEBUG, "TKIP: Calculated MIC", mic, 8);
wpa_hexdump(MSG_DEBUG, "TKIP: Received MIC",
plain + plain_len - 8, 8);
os_free(plain);
return NULL;
}
*decrypted_len = plain_len - 8;
return plain;
}
void tkip_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[0]; /* PN1 */
pn[5] = data[2]; /* PN0 */
}
u8 * tkip_encrypt(const u8 *tk, u8 *frame, size_t len, size_t hdrlen, u8 *qos,
u8 *pn, int keyid, size_t *encrypted_len)
{
u8 michael_hdr[16];
u8 mic[8];
struct ieee80211_hdr *hdr;
u16 fc;
const u8 *mic_key;
u8 *crypt, *pos;
u16 iv16;
u32 iv32;
u16 ttak[5];
u8 rc4key[16];
if (len < sizeof(*hdr) || len < hdrlen)
return NULL;
hdr = (struct ieee80211_hdr *) frame;
fc = le_to_host16(hdr->frame_control);
michael_mic_hdr(hdr, michael_hdr);
mic_key = tk + ((fc & WLAN_FC_FROMDS) ? 16 : 24);
michael_mic(mic_key, michael_hdr, frame + hdrlen, len - hdrlen, mic);
wpa_hexdump(MSG_EXCESSIVE, "TKIP: MIC", mic, sizeof(mic));
iv32 = WPA_GET_BE32(pn);
iv16 = WPA_GET_BE16(pn + 4);
tkip_mixing_phase1(ttak, tk, hdr->addr2, iv32);
wpa_hexdump(MSG_EXCESSIVE, "TKIP TTAK", (u8 *) ttak, sizeof(ttak));
tkip_mixing_phase2(rc4key, tk, ttak, iv16);
wpa_hexdump(MSG_EXCESSIVE, "TKIP RC4KEY", rc4key, sizeof(rc4key));
crypt = os_malloc(len + 8 + sizeof(mic) + 4);
if (crypt == NULL)
return NULL;
os_memcpy(crypt, frame, hdrlen);
pos = crypt + hdrlen;
os_memcpy(pos, rc4key, 3);
pos += 3;
*pos++ = keyid << 6 | BIT(5);
*pos++ = pn[3];
*pos++ = pn[2];
*pos++ = pn[1];
*pos++ = pn[0];
os_memcpy(pos, frame + hdrlen, len - hdrlen);
os_memcpy(pos + len - hdrlen, mic, sizeof(mic));
WPA_PUT_LE32(pos + len - hdrlen + sizeof(mic),
crc32(pos, len - hdrlen + sizeof(mic)));
wep_crypt(rc4key, pos, len - hdrlen + sizeof(mic) + 4);
*encrypted_len = len + 8 + sizeof(mic) + 4;
return crypt;
}
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