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/*
* SAE-PK
* Copyright (c) 2020, The Linux Foundation
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#ifdef CONFIG_SAE_PK
#include "utils/includes.h"
#include "utils/common.h"
#include "common/ieee802_11_defs.h"
#include "common/wpa_supplicant_i.h"
#include "common/ieee802_11_common.h"
#include "esp_common_i.h"
#include "sae.h"
#include "utils/base64.h"
#include "crypto/crypto.h"
#include "crypto/aes.h"
#include "crypto/aes_siv.h"
extern struct wpa_supplicant g_wpa_supp;
/* RFC 4648 base 32 alphabet with lowercase characters */
static const char *sae_pk_base32_table = "abcdefghijklmnopqrstuvwxyz234567";
static const u8 d_mult_table[] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 0,
17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 16,
2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 0, 1,
18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 16, 17,
3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 0, 1, 2,
19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 16, 17, 18,
4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 0, 1, 2, 3,
20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 16, 17, 18, 19,
5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 0, 1, 2, 3, 4,
21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 16, 17, 18, 19, 20,
6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 0, 1, 2, 3, 4, 5,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 16, 17, 18, 19, 20, 21,
7, 8, 9, 10, 11, 12, 13, 14, 15, 0, 1, 2, 3, 4, 5, 6,
23, 24, 25, 26, 27, 28, 29, 30, 31, 16, 17, 18, 19, 20, 21, 22,
8, 9, 10, 11, 12, 13, 14, 15, 0, 1, 2, 3, 4, 5, 6, 7,
24, 25, 26, 27, 28, 29, 30, 31, 16, 17, 18, 19, 20, 21, 22, 23,
9, 10, 11, 12, 13, 14, 15, 0, 1, 2, 3, 4, 5, 6, 7, 8,
25, 26, 27, 28, 29, 30, 31, 16, 17, 18, 19, 20, 21, 22, 23, 24,
10, 11, 12, 13, 14, 15, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
26, 27, 28, 29, 30, 31, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,
11, 12, 13, 14, 15, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
27, 28, 29, 30, 31, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26,
12, 13, 14, 15, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
28, 29, 30, 31, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27,
13, 14, 15, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
29, 30, 31, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28,
14, 15, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
30, 31, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
15, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
31, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30,
16, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17,
0, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1,
17, 16, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18,
1, 0, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2,
18, 17, 16, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19,
2, 1, 0, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3,
19, 18, 17, 16, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20,
3, 2, 1, 0, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4,
20, 19, 18, 17, 16, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21,
4, 3, 2, 1, 0, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5,
21, 20, 19, 18, 17, 16, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22,
5, 4, 3, 2, 1, 0, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6,
22, 21, 20, 19, 18, 17, 16, 31, 30, 29, 28, 27, 26, 25, 24, 23,
6, 5, 4, 3, 2, 1, 0, 15, 14, 13, 12, 11, 10, 9, 8, 7,
23, 22, 21, 20, 19, 18, 17, 16, 31, 30, 29, 28, 27, 26, 25, 24,
7, 6, 5, 4, 3, 2, 1, 0, 15, 14, 13, 12, 11, 10, 9, 8,
24, 23, 22, 21, 20, 19, 18, 17, 16, 31, 30, 29, 28, 27, 26, 25,
8, 7, 6, 5, 4, 3, 2, 1, 0, 15, 14, 13, 12, 11, 10, 9,
25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 31, 30, 29, 28, 27, 26,
9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 15, 14, 13, 12, 11, 10,
26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 31, 30, 29, 28, 27,
10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 15, 14, 13, 12, 11,
27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 31, 30, 29, 28,
11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 15, 14, 13, 12,
28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 31, 30, 29,
12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 15, 14, 13,
29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 31, 30,
13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 15, 14,
30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 31,
14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 15,
31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16,
15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0
};
static const u8 d_perm_table[] = {
7, 2, 1, 30, 16, 20, 27, 11, 31, 6, 8, 13, 29, 5, 10, 21,
22, 3, 24, 0, 23, 25, 12, 9, 28, 14, 4, 15, 17, 18, 19, 26
};
static u8 d_permute(u8 val, unsigned int iter)
{
if (iter == 0) {
return val;
}
return d_permute(d_perm_table[val], iter - 1);
}
static u8 d_invert(u8 val)
{
if (val > 0 && val < 16) {
return 16 - val;
}
return val;
}
static char d_check_char(const char *str, size_t len)
{
size_t i;
u8 val = 0;
u8 dtable[256];
unsigned int iter = 1;
int j;
os_memset(dtable, 0x80, 256);
for (i = 0; sae_pk_base32_table[i]; i++) {
dtable[(u8) sae_pk_base32_table[i]] = i;
}
for (j = len - 1; j >= 0; j--) {
u8 c, p;
c = dtable[(u8) str[j]];
if (c == 0x80) {
continue;
}
p = d_permute(c, iter);
iter++;
val = d_mult_table[val * 32 + p];
}
return sae_pk_base32_table[d_invert(val)];
}
bool sae_pk_valid_password(const char *pw)
{
int pos;
size_t i, pw_len = os_strlen(pw);
u8 sec_1b;
u8 dtable[256];
os_memset(dtable, 0x80, 256);
for (i = 0; sae_pk_base32_table[i]; i++) {
dtable[(u8) sae_pk_base32_table[i]] = i;
}
/* SAE-PK password has at least three four character components
* separated by hyphens. */
if (pw_len < 14 || pw_len % 5 != 4) {
wpa_printf(MSG_DEBUG, "SAE-PK: Not a valid password (length)");
return false;
}
for (pos = 0; pw[pos]; pos++) {
if (pos && pos % 5 == 4) {
if (pw[pos] != '-') {
wpa_printf(MSG_DEBUG,
"SAE-PK: Not a valid password (separator)");
return false;
}
continue;
}
if (dtable[(u8) pw[pos]] == 0x80) {
wpa_printf(MSG_DEBUG,
"SAE-PK: Not a valid password (character)");
return false;
}
}
/* Verify that the checksum character is valid */
if (pw[pw_len - 1] != d_check_char(pw, pw_len - 1)) {
wpa_printf(MSG_DEBUG,
"SAE-PK: Not a valid password (checksum)");
return false;
}
/* Verify that Sec_1b bits match */
sec_1b = dtable[(u8) pw[0]] & BIT(4);
for (i = 5; i < pw_len; i += 5) {
if (sec_1b != (dtable[(u8) pw[i]] & BIT(4))) {
wpa_printf(MSG_DEBUG,
"SAE-PK: Not a valid password (Sec_1b)");
return false;
}
}
return true;
}
static char *add_char(const char *start, char *pos, u8 idx, size_t *bits)
{
if (*bits == 0) {
return pos;
}
if (*bits > 5) {
*bits -= 5;
} else {
*bits = 0;
}
if ((pos - start) % 5 == 4) {
*pos++ = '-';
}
*pos++ = sae_pk_base32_table[idx];
return pos;
}
/* Base32 encode a password and add hyper separators and checksum */
char *sae_pk_base32_encode(const u8 *src, size_t len_bits)
{
char *out, *pos;
size_t olen, extra_pad, i;
u64 block = 0;
u8 val;
size_t len = (len_bits + 7) / 8;
size_t left = len_bits;
int j;
if (len == 0 || len >= SIZE_MAX / 8) {
return NULL;
}
olen = len * 8 / 5 + 1;
olen += olen / 4; /* hyphen separators */
pos = out = os_zalloc(olen + 2); /* include room for ChkSum and nul */
if (!out) {
return NULL;
}
extra_pad = (5 - len % 5) % 5;
for (i = 0; i < len + extra_pad; i++) {
val = i < len ? src[i] : 0;
block <<= 8;
block |= val;
if (i % 5 == 4) {
for (j = 7; j >= 0; j--)
pos = add_char(out, pos,
(block >> j * 5) & 0x1f, &left);
block = 0;
}
}
*pos = d_check_char(out, os_strlen(out));
return out;
}
u8 *sae_pk_base32_decode(const char *src, size_t len, size_t *out_len)
{
u8 dtable[256], *out, *pos, tmp;
u64 block = 0;
size_t i, count, olen;
int pad = 0;
size_t extra_pad;
os_memset(dtable, 0x80, 256);
for (i = 0; sae_pk_base32_table[i]; i++) {
dtable[(u8) sae_pk_base32_table[i]] = i;
}
dtable['='] = 0;
count = 0;
for (i = 0; i < len; i++) {
if (dtable[(u8) src[i]] != 0x80) {
count++;
}
}
if (count == 0) {
return NULL;
}
extra_pad = (8 - count % 8) % 8;
olen = (count + extra_pad) / 8 * 5;
pos = out = os_malloc(olen);
if (!out) {
return NULL;
}
count = 0;
for (i = 0; i < len + extra_pad; i++) {
u8 val;
if (i >= len) {
val = '=';
} else {
val = src[i];
}
tmp = dtable[val];
if (tmp == 0x80) {
continue;
}
if (val == '=') {
pad++;
}
block <<= 5;
block |= tmp;
count++;
if (count == 8) {
*pos++ = (block >> 32) & 0xff;
*pos++ = (block >> 24) & 0xff;
*pos++ = (block >> 16) & 0xff;
*pos++ = (block >> 8) & 0xff;
*pos++ = block & 0xff;
count = 0;
block = 0;
if (pad) {
/* Leave in all the available bits with zero
* padding to full octets from right. */
pos -= pad * 5 / 8;
break;
}
}
}
*out_len = pos - out;
return out;
}
u32 sae_pk_get_be19(const u8 *buf)
{
return (buf[0] << 11) | (buf[1] << 3) | (buf[2] >> 5);
}
/* shift left by two octets and three bits; fill in zeros from right;
* len must be at least three */
void sae_pk_buf_shift_left_19(u8 *buf, size_t len)
{
u8 *dst, *src, *end;
dst = buf;
src = buf + 2;
end = buf + len;
while (src + 1 < end) {
*dst++ = (src[0] << 3) | (src[1] >> 5);
src++;
}
*dst++ = *src << 3;
*dst++ = 0;
*dst++ = 0;
}
static void sae_pk_buf_shift_left_1(u8 *buf, size_t len)
{
u8 *dst, *src, *end;
dst = buf;
src = buf;
end = buf + len;
while (src + 1 < end) {
*dst++ = (src[0] << 1) | (src[1] >> 7);
src++;
}
*dst++ = *src << 1;
}
int sae_pk_set_password(struct sae_data *sae, const char *password)
{
struct sae_temporary_data *tmp = sae->tmp;
size_t len, pw_len;
u8 *pw, *pos;
int bits;
u32 val = 0, val19;
unsigned int val_bits = 0;
if (!tmp) {
return -1;
}
os_memset(tmp->fingerprint, 0, sizeof(tmp->fingerprint));
tmp->fingerprint_bytes = tmp->fingerprint_bits = 0;
len = os_strlen(password);
if (len < 1 || !sae_pk_valid_password(password)) {
return -1;
}
pw = sae_pk_base32_decode(password, len, &pw_len);
if (!pw) {
return -1;
}
tmp->sec = (pw[0] & BIT(7)) ? 3 : 5;
tmp->lambda = len - len / 5;
tmp->fingerprint_bits = 8 * tmp->sec + 19 * tmp->lambda / 4 - 5;
wpa_printf(MSG_DEBUG, "SAE-PK: Sec=%u Lambda=%zu fingerprint_bits=%zu",
tmp->sec, tmp->lambda, tmp->fingerprint_bits);
/* Construct Fingerprint from PasswordBase by prefixing with Sec zero
* octets and skipping the Sec_1b bits */
pos = &tmp->fingerprint[tmp->sec];
bits = tmp->fingerprint_bits - 8 * tmp->sec;
wpa_hexdump_key(MSG_DEBUG, "SAE-PK: PasswordBase", pw, pw_len);
while (bits > 0) {
if (val_bits < 8) {
sae_pk_buf_shift_left_1(pw, pw_len); /* Sec_1b */
val19 = sae_pk_get_be19(pw);
sae_pk_buf_shift_left_19(pw, pw_len);
val = (val << 19) | val19;
val_bits += 19;
}
if (val_bits >= 8) {
if (bits < 8) {
break;
}
*pos++ = (val >> (val_bits - 8)) & 0xff;
val_bits -= 8;
bits -= 8;
}
}
if (bits > 0) {
val >>= val_bits - bits;
*pos++ = val << (8 - bits);
}
tmp->fingerprint_bytes = pos - tmp->fingerprint;
wpa_hexdump_key(MSG_DEBUG, "SAE-PK: Fingerprint",
tmp->fingerprint, tmp->fingerprint_bytes);
bin_clear_free(pw, pw_len);
return 0;
}
static size_t sae_group_2_hash_len(int group)
{
switch (group) {
case 19:
return 32;
case 20:
return 48;
case 21:
return 64;
}
return 0;
}
int sae_hash(size_t hash_len, const u8 *data, size_t len, u8 *hash)
{
if (hash_len == 32) {
return sha256_vector(1, &data, &len, hash);
}
#ifdef CONFIG_SHA384
if (hash_len == 48) {
return sha384_vector(1, &data, &len, hash);
}
#endif /* CONFIG_SHA384 */
#ifdef CONFIG_SHA512
if (hash_len == 64) {
return sha512_vector(1, &data, &len, hash);
}
#endif /* CONFIG_SHA512 */
return -1;
}
static int sae_pk_hash_sig_data(struct sae_data *sae, size_t hash_len,
bool ap, const u8 *m, size_t m_len,
const u8 *pubkey, size_t pubkey_len, u8 *hash)
{
struct sae_temporary_data *tmp = sae->tmp;
struct wpabuf *sig_data;
u8 *pos;
int ret = -1;
/* Signed data for KeyAuth: eleAP || eleSTA || scaAP || scaSTA ||
* M || K_AP || AP-BSSID || STA-MAC */
sig_data = wpabuf_alloc(tmp->prime_len * 6 + m_len + pubkey_len +
2 * ETH_ALEN);
if (!sig_data) {
goto fail;
}
pos = wpabuf_put(sig_data, 2 * tmp->prime_len);
if (crypto_ec_point_to_bin(tmp->ec, ap ? tmp->own_commit_element_ecc :
tmp->peer_commit_element_ecc,
pos, pos + tmp->prime_len) < 0) {
goto fail;
}
pos = wpabuf_put(sig_data, 2 * tmp->prime_len);
if (crypto_ec_point_to_bin(tmp->ec, ap ? tmp->peer_commit_element_ecc :
tmp->own_commit_element_ecc,
pos, pos + tmp->prime_len) < 0) {
goto fail;
}
if (crypto_bignum_to_bin(ap ? tmp->own_commit_scalar :
sae->peer_commit_scalar,
wpabuf_put(sig_data, tmp->prime_len),
tmp->prime_len, tmp->prime_len) < 0 ||
crypto_bignum_to_bin(ap ? sae->peer_commit_scalar :
tmp->own_commit_scalar,
wpabuf_put(sig_data, tmp->prime_len),
tmp->prime_len, tmp->prime_len) < 0) {
goto fail;
}
wpabuf_put_data(sig_data, m, m_len);
wpabuf_put_data(sig_data, pubkey, pubkey_len);
wpabuf_put_data(sig_data, ap ? tmp->own_addr : tmp->peer_addr,
ETH_ALEN);
wpabuf_put_data(sig_data, ap ? tmp->peer_addr : tmp->own_addr,
ETH_ALEN);
wpa_hexdump_buf_key(MSG_DEBUG, "SAE-PK: Data to be signed for KeyAuth",
sig_data);
if (sae_hash(hash_len, wpabuf_head(sig_data), wpabuf_len(sig_data),
hash) < 0) {
goto fail;
}
wpa_hexdump(MSG_DEBUG, "SAE-PK: hash(data to be signed)",
hash, hash_len);
ret = 0;
fail:
wpabuf_free(sig_data);
return ret;
}
static bool sae_pk_valid_fingerprint(struct sae_data *sae,
const u8 *m, size_t m_len,
const u8 *k_ap, size_t k_ap_len, int group)
{
struct sae_temporary_data *tmp = sae->tmp;
u8 *hash_data, *pos;
size_t hash_len, hash_data_len;
u8 hash[SAE_MAX_HASH_LEN];
int res;
if (!tmp->fingerprint_bytes) {
wpa_printf(MSG_DEBUG,
"SAE-PK: No PW available for K_AP fingerprint check");
return false;
}
/* Fingerprint = L(Hash(SSID || M || K_AP), 0, 8*Sec + 19*Lambda/4 - 5)
*/
hash_len = sae_group_2_hash_len(group);
hash_data_len = tmp->ssid_len + m_len + k_ap_len;
hash_data = os_malloc(hash_data_len);
if (!hash_data) {
return false;
}
pos = hash_data;
os_memcpy(pos, tmp->ssid, tmp->ssid_len);
pos += tmp->ssid_len;
os_memcpy(pos, m, m_len);
pos += m_len;
os_memcpy(pos, k_ap, k_ap_len);
wpa_hexdump_key(MSG_DEBUG, "SAE-PK: SSID || M || K_AP",
hash_data, hash_data_len);
res = sae_hash(hash_len, hash_data, hash_data_len, hash);
bin_clear_free(hash_data, hash_data_len);
if (res < 0) {
return false;
}
wpa_hexdump(MSG_DEBUG, "SAE-PK: Hash(SSID || M || K_AP)",
hash, hash_len);
if (tmp->fingerprint_bits > hash_len * 8) {
wpa_printf(MSG_INFO,
"SAE-PK: Not enough hash output bits for the fingerprint");
return false;
}
if (tmp->fingerprint_bits % 8) {
size_t extra;
/* Zero out the extra bits in the last octet */
extra = 8 - tmp->fingerprint_bits % 8;
pos = &hash[tmp->fingerprint_bits / 8];
*pos = (*pos >> extra) << extra;
}
wpa_hexdump(MSG_DEBUG, "SAE-PK: Fingerprint", hash,
tmp->fingerprint_bytes);
res = os_memcmp_const(hash, tmp->fingerprint, tmp->fingerprint_bytes);
if (res) {
wpa_printf(MSG_DEBUG, "SAE-PK: K_AP fingerprint mismatch");
wpa_hexdump(MSG_DEBUG, "SAE-PK: Expected fingerprint",
tmp->fingerprint, tmp->fingerprint_bytes);
return false;
}
wpa_printf(MSG_DEBUG, "SAE-PK: Valid K_AP fingerprint");
return true;
}
int sae_check_confirm_pk(struct sae_data *sae, const u8 *ies, size_t ies_len)
{
struct sae_temporary_data *tmp = sae->tmp;
const u8 *k_ap;
u8 m[SAE_PK_M_LEN];
size_t k_ap_len;
struct crypto_ec_key *key;
int res;
u8 hash[SAE_MAX_HASH_LEN];
size_t hash_len;
int group;
struct wpa_supplicant *wpa_s = &g_wpa_supp;
struct sae_pk_elems elems;
int ret = 0;
if (!tmp) {
return -1;
}
if (!sae->pk || tmp->ap_pk) {
return 0;
}
if (tmp->kek_len != 32 && tmp->kek_len != 48 && tmp->kek_len != 64) {
wpa_printf(MSG_INFO,
"SAE-PK: No KEK available for checking confirm");
return -1;
}
if (!tmp->ec) {
/* Only ECC groups are supported for SAE-PK in the current
* implementation. */
wpa_printf(MSG_INFO,
"SAE-PK: SAE commit did not use an ECC group");
return -1;
}
wpa_hexdump(MSG_DEBUG, "SAE-PK: Received confirm IEs", ies, ies_len);
ieee802_11_parse_elems(wpa_s, ies, ies_len);
elems = wpa_s->sae_pk_elems;
if (!elems.fils_pk || !elems.fils_key_confirm || !elems.sae_pk) {
wpa_printf(MSG_INFO,
"SAE-PK: Not all mandatory IEs included in confirm");
ret = -1;
goto done;
}
/* TODO: Fragment reassembly */
if (elems.sae_pk_len < SAE_PK_M_LEN + AES_BLOCK_SIZE) {
wpa_printf(MSG_INFO,
"SAE-PK: No room for EncryptedModifier in SAE-PK element");
ret = -1;
goto done;
}
wpa_hexdump(MSG_DEBUG, "SAE-PK: EncryptedModifier",
elems.sae_pk, SAE_PK_M_LEN + AES_BLOCK_SIZE);
if (aes_siv_decrypt(tmp->kek, tmp->kek_len,
elems.sae_pk, SAE_PK_M_LEN + AES_BLOCK_SIZE,
0, NULL, NULL, m) < 0) {
wpa_printf(MSG_INFO,
"SAE-PK: Failed to decrypt EncryptedModifier");
ret = -1;
goto done;
}
wpa_hexdump_key(MSG_DEBUG, "SAE-PK: Modifier M", m, SAE_PK_M_LEN);
if (elems.fils_pk[0] != 2) {
wpa_printf(MSG_INFO, "SAE-PK: Unsupported public key type %u",
elems.fils_pk[0]);
ret = -1;
goto done;
}
k_ap_len = elems.fils_pk_len - 1;
k_ap = elems.fils_pk + 1;
wpa_hexdump(MSG_DEBUG, "SAE-PK: Received K_AP", k_ap, k_ap_len);
/* TODO: Check against the public key, if one is stored in the network
* profile */
key = crypto_ec_key_parse_pub(k_ap, k_ap_len);
if (!key) {
wpa_printf(MSG_INFO, "SAE-PK: Failed to parse K_AP");
ret = -1;
goto done;
}
group = crypto_ec_key_group(key);
if (!sae_pk_valid_fingerprint(sae, m, SAE_PK_M_LEN, k_ap, k_ap_len,
group)) {
crypto_ec_key_deinit(key);
ret = -1;
goto done;
}
wpa_hexdump(MSG_DEBUG, "SAE-PK: Received KeyAuth",
elems.fils_key_confirm, elems.fils_key_confirm_len);
hash_len = sae_group_2_hash_len(group);
if (sae_pk_hash_sig_data(sae, hash_len, false, m, SAE_PK_M_LEN,
k_ap, k_ap_len, hash) < 0) {
crypto_ec_key_deinit(key);
ret = -1;
goto done;
}
res = crypto_ec_key_verify_signature(key, hash, hash_len,
elems.fils_key_confirm,
elems.fils_key_confirm_len);
crypto_ec_key_deinit(key);
if (res != 1) {
wpa_printf(MSG_INFO,
"SAE-PK: Invalid or incorrect signature in KeyAuth");
ret = -1;
goto done;
}
wpa_printf(MSG_DEBUG, "SAE-PK: Valid KeyAuth signature received");
/* TODO: Store validated public key into network profile */
done:
if (wpa_s->sae_pk_elems.fils_pk) {
os_free(wpa_s->sae_pk_elems.fils_pk);
}
if (wpa_s->sae_pk_elems.sae_pk) {
os_free(wpa_s->sae_pk_elems.sae_pk);
}
if (wpa_s->sae_pk_elems.fils_key_confirm) {
os_free(wpa_s->sae_pk_elems.fils_key_confirm);
}
os_memset(&wpa_s->sae_pk_elems, 0, sizeof(wpa_s->sae_pk_elems));
return ret;
}
#endif /* CONFIG_SAE_PK */
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