SAE: Add support for FFC groups
This allows FFC groups to be used with SAE. Though, these groups are not included in the default sae_groups value based on what is available since the FFC groups have the additional requirement of using a safe prime with the current implementation (or specification of the group order). Signed-hostap: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen
parent
388f535461
commit
fbfb0e65bf
6 changed files with 398 additions and 20 deletions
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@ -204,6 +204,7 @@ ifdef CONFIG_SAE
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L_CFLAGS += -DCONFIG_SAE
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OBJS += src/common/sae.c
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NEED_ECC=y
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NEED_DH_GROUPS=y
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endif
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ifdef CONFIG_IEEE80211N
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@ -176,6 +176,7 @@ ifdef CONFIG_SAE
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CFLAGS += -DCONFIG_SAE
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OBJS += ../src/common/sae.o
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NEED_ECC=y
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NEED_DH_GROUPS=y
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endif
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ifdef CONFIG_WNM
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408
src/common/sae.c
408
src/common/sae.c
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@ -12,23 +12,58 @@
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#include "crypto/crypto.h"
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#include "crypto/sha256.h"
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#include "crypto/random.h"
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#include "crypto/dh_groups.h"
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#include "ieee802_11_defs.h"
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#include "sae.h"
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int sae_set_group(struct sae_data *sae, int group)
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{
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crypto_ec_deinit(sae->ec);
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sae_clear_data(sae);
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/* First, check if this is an ECC group */
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sae->ec = crypto_ec_init(group);
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if (!sae->ec)
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return -1;
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if (sae->ec) {
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sae->group = group;
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sae->prime_len = crypto_ec_prime_len(sae->ec);
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sae->prime = crypto_ec_get_prime(sae->ec);
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sae->order = crypto_ec_get_order(sae->ec);
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return 0;
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}
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sae->group = group;
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sae->prime_len = crypto_ec_prime_len(sae->ec);
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sae->prime = crypto_ec_get_prime(sae->ec);
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sae->order = crypto_ec_get_order(sae->ec);
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/* Not an ECC group, check FFC */
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sae->dh = dh_groups_get(group);
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if (sae->dh) {
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sae->group = group;
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sae->prime_len = sae->dh->prime_len;
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if (sae->prime_len > SAE_MAX_PRIME_LEN) {
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sae_clear_data(sae);
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return -1;
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}
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return 0;
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sae->prime_buf = crypto_bignum_init_set(sae->dh->prime,
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sae->prime_len);
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if (sae->prime_buf == NULL) {
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sae_clear_data(sae);
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return -1;
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}
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sae->prime = sae->prime_buf;
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/* Assume r = (p-1)/2 for this group */
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sae->safe_prime = 1;
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sae->order_buf = crypto_bignum_init();
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if (sae->order_buf == NULL ||
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crypto_bignum_rshift(sae->prime, 1, sae->order_buf) < 0) {
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sae_clear_data(sae);
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return -1;
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}
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sae->order = sae->order_buf;
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return 0;
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}
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/* Unsupported group */
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return -1;
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}
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@ -37,10 +72,25 @@ void sae_clear_data(struct sae_data *sae)
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if (sae == NULL)
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return;
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crypto_ec_deinit(sae->ec);
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crypto_bignum_deinit(sae->prime_buf, 0);
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crypto_bignum_deinit(sae->order_buf, 0);
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os_memset(sae, 0, sizeof(*sae));
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}
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static int val_one(const u8 *val, size_t len)
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{
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size_t i;
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for (i = 0; i < len - 1; i++) {
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if (val[i])
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return 0;
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}
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return val[len - 1] == 1;
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}
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static int val_zero_or_one(const u8 *val, size_t len)
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{
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size_t i;
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@ -115,6 +165,27 @@ static struct crypto_bignum * sae_get_rand_and_mask(struct sae_data *sae)
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}
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static struct crypto_bignum * sae_get_rand_and_mask_dh(struct sae_data *sae)
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{
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u8 mask[SAE_MAX_PRIME_LEN], order[SAE_MAX_PRIME_LEN];
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struct crypto_bignum *bn;
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size_t prime_len_bits = sae->prime_len * 8;
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if (crypto_bignum_to_bin(sae->order, order, sizeof(order),
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sae->prime_len) < 0 ||
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sae_get_rand(order, prime_len_bits, sae->sae_rand) < 0 ||
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sae_get_rand(order, prime_len_bits, mask) < 0)
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return NULL;
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wpa_hexdump_key(MSG_DEBUG, "SAE: rand",
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sae->sae_rand, sae->prime_len);
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wpa_hexdump_key(MSG_DEBUG, "SAE: mask", mask, sae->prime_len);
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bn = crypto_bignum_init_set(mask, sae->prime_len);
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os_memset(mask, 0, sizeof(mask));
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return bn;
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}
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static void sae_pwd_seed_key(const u8 *addr1, const u8 *addr2, u8 *key)
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{
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wpa_printf(MSG_DEBUG, "SAE: PWE derivation - addr1=" MACSTR
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@ -304,9 +375,9 @@ fail:
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}
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int sae_prepare_commit(const u8 *addr1, const u8 *addr2,
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const u8 *password, size_t password_len,
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struct sae_data *sae)
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static int sae_prepare_commit_ec(const u8 *addr1, const u8 *addr2,
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const u8 *password, size_t password_len,
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struct sae_data *sae)
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{
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struct crypto_ec_point *pwe;
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int ret = 0;
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@ -324,6 +395,224 @@ int sae_prepare_commit(const u8 *addr1, const u8 *addr2,
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}
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static int sae_test_pwd_seed_dh(struct sae_data *sae, const u8 *pwd_seed,
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struct crypto_bignum *pwe)
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{
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u8 pwd_value[SAE_MAX_PRIME_LEN];
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size_t bits = sae->prime_len * 8;
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u8 exp[1];
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struct crypto_bignum *a, *b;
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int res;
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wpa_hexdump_key(MSG_DEBUG, "SAE: pwd-seed", pwd_seed, SHA256_MAC_LEN);
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/* pwd-value = KDF-z(pwd-seed, "SAE Hunting and Pecking", p) */
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sha256_prf_bits(pwd_seed, SHA256_MAC_LEN, "SAE Hunting and Pecking",
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sae->dh->prime, sae->prime_len, pwd_value, bits);
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if (bits % 8)
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buf_shift_right(pwd_value, sizeof(pwd_value), 8 - bits % 8);
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wpa_hexdump_key(MSG_DEBUG, "SAE: pwd-value", pwd_value, sae->prime_len);
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if (os_memcmp(pwd_value, sae->dh->prime, sae->prime_len) >= 0) {
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wpa_printf(MSG_DEBUG, "SAE: pwd-value >= p");
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return 0;
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}
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/* PWE = pwd-value^((p-1)/r) modulo p */
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a = crypto_bignum_init_set(pwd_value, sae->prime_len);
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if (sae->safe_prime) {
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/*
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* r = (p-1)/2 for the group used here, so this becomes:
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* PWE = pwd-value^2 modulo p
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*/
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exp[0] = 2;
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b = crypto_bignum_init_set(exp, sizeof(exp));
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if (a == NULL || b == NULL)
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res = -1;
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else
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res = crypto_bignum_exptmod(a, b, sae->prime, pwe);
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} else {
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struct crypto_bignum *tmp;
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exp[0] = 1;
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b = crypto_bignum_init_set(exp, sizeof(exp));
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tmp = crypto_bignum_init();
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if (a == NULL || b == NULL || tmp == NULL ||
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crypto_bignum_sub(sae->prime, b, tmp) < 0 ||
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crypto_bignum_div(tmp, sae->order, b) < 0)
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res = -1;
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else
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res = crypto_bignum_exptmod(a, b, sae->prime, pwe);
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crypto_bignum_deinit(tmp, 0);
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}
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crypto_bignum_deinit(a, 0);
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crypto_bignum_deinit(b, 0);
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if (res < 0) {
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wpa_printf(MSG_DEBUG, "SAE: Failed to calculate PWE");
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return -1;
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}
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res = crypto_bignum_to_bin(pwe, sae->pwe, sizeof(sae->pwe),
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sae->prime_len);
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if (res < 0) {
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wpa_printf(MSG_DEBUG, "SAE: Not room for PWE");
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return -1;
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}
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wpa_hexdump_key(MSG_DEBUG, "SAE: PWE candidate", sae->pwe, res);
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/* if (PWE > 1) --> found */
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if (val_zero_or_one(sae->pwe, sae->prime_len)) {
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wpa_printf(MSG_DEBUG, "SAE: PWE <= 1");
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return 0;
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}
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wpa_printf(MSG_DEBUG, "SAE: PWE found");
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return 1;
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}
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static int sae_derive_pwe_dh(struct sae_data *sae, const u8 *addr1,
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const u8 *addr2, const u8 *password,
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size_t password_len, struct crypto_bignum *pwe)
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{
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u8 counter;
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u8 addrs[2 * ETH_ALEN];
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const u8 *addr[2];
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size_t len[2];
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int found = 0;
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wpa_hexdump_ascii_key(MSG_DEBUG, "SAE: password",
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password, password_len);
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/*
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* H(salt, ikm) = HMAC-SHA256(salt, ikm)
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* pwd-seed = H(MAX(STA-A-MAC, STA-B-MAC) || MIN(STA-A-MAC, STA-B-MAC),
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* password || counter)
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*/
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sae_pwd_seed_key(addr1, addr2, addrs);
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addr[0] = password;
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len[0] = password_len;
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addr[1] = &counter;
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len[1] = sizeof(counter);
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for (counter = 1; !found; counter++) {
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u8 pwd_seed[SHA256_MAC_LEN];
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int res;
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if (counter > 200) {
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/* This should not happen in practice */
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wpa_printf(MSG_DEBUG, "SAE: Failed to derive PWE");
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break;
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}
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wpa_printf(MSG_DEBUG, "SAE: counter = %u", counter);
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if (hmac_sha256_vector(addrs, sizeof(addrs), 2, addr, len,
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pwd_seed) < 0)
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break;
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res = sae_test_pwd_seed_dh(sae, pwd_seed, pwe);
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if (res < 0)
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break;
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if (res > 0) {
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wpa_printf(MSG_DEBUG, "SAE: Use this PWE");
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found = 1;
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}
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}
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return found ? 0 : -1;
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}
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static int sae_derive_commit_dh(struct sae_data *sae, struct crypto_bignum *pwe)
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{
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struct crypto_bignum *x, *bn_rand, *mask, *elem;
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int ret = -1;
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mask = sae_get_rand_and_mask_dh(sae);
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if (mask == NULL) {
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wpa_printf(MSG_DEBUG, "SAE: Could not get rand/mask");
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return -1;
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}
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x = crypto_bignum_init();
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bn_rand = crypto_bignum_init_set(sae->sae_rand, sae->prime_len);
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elem = crypto_bignum_init();
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if (x == NULL || bn_rand == NULL || elem == NULL)
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goto fail;
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/* commit-scalar = (rand + mask) modulo r */
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crypto_bignum_add(bn_rand, mask, x);
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crypto_bignum_mod(x, sae->order, x);
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crypto_bignum_to_bin(x, sae->own_commit_scalar,
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sizeof(sae->own_commit_scalar), sae->prime_len);
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wpa_hexdump(MSG_DEBUG, "SAE: commit-scalar",
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sae->own_commit_scalar, sae->prime_len);
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/* COMMIT-ELEMENT = inverse(scalar-op(mask, PWE)) */
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if (crypto_bignum_exptmod(pwe, mask, sae->prime, elem) < 0 ||
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crypto_bignum_inverse(elem, sae->prime, elem) < 0 ||
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crypto_bignum_to_bin(elem, sae->own_commit_element,
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sizeof(sae->own_commit_element),
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sae->prime_len) < 0) {
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wpa_printf(MSG_DEBUG, "SAE: Could not compute commit-element");
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goto fail;
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}
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wpa_hexdump(MSG_DEBUG, "SAE: commit-element",
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sae->own_commit_element, sae->prime_len);
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ret = 0;
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fail:
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crypto_bignum_deinit(elem, 0);
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crypto_bignum_deinit(mask, 1);
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crypto_bignum_deinit(bn_rand, 1);
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crypto_bignum_deinit(x, 1);
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return ret;
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}
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static int sae_prepare_commit_dh(const u8 *addr1, const u8 *addr2,
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const u8 *password, size_t password_len,
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struct sae_data *sae)
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{
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struct crypto_bignum *pwe;
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int ret = 0;
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pwe = crypto_bignum_init();
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if (pwe == NULL ||
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sae_derive_pwe_dh(sae, addr1, addr2, password, password_len, pwe) <
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0 ||
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sae_derive_commit_dh(sae, pwe) < 0)
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ret = -1;
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crypto_bignum_deinit(pwe, 1);
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return ret;
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}
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int sae_prepare_commit(const u8 *addr1, const u8 *addr2,
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const u8 *password, size_t password_len,
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struct sae_data *sae)
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{
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if (sae->ec) {
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return sae_prepare_commit_ec(addr1, addr2, password,
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password_len, sae);
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}
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if (sae->dh) {
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return sae_prepare_commit_dh(addr1, addr2, password,
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password_len, sae);
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}
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return -1;
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}
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static int sae_check_peer_commit(struct sae_data *sae)
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{
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u8 order[SAE_MAX_PRIME_LEN], prime[SAE_MAX_PRIME_LEN];
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@ -341,6 +630,16 @@ static int sae_check_peer_commit(struct sae_data *sae)
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return -1;
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}
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if (sae->dh) {
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if (os_memcmp(sae->peer_commit_element, prime, sae->prime_len)
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>= 0 ||
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val_zero_or_one(sae->peer_commit_element, sae->prime_len)) {
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wpa_printf(MSG_DEBUG, "SAE: Invalid peer element");
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return -1;
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}
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return 0;
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}
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/* element x and y coordinates < p */
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if (os_memcmp(sae->peer_commit_element, prime, sae->prime_len) >= 0 ||
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os_memcmp(sae->peer_commit_element + sae->prime_len, prime,
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@ -354,7 +653,7 @@ static int sae_check_peer_commit(struct sae_data *sae)
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}
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static int sae_derive_k(struct sae_data *sae, u8 *k)
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static int sae_derive_k_ec(struct sae_data *sae, u8 *k)
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{
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struct crypto_ec_point *pwe, *peer_elem, *K;
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struct crypto_bignum *rand_bn, *peer_scalar;
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@ -403,6 +702,58 @@ fail:
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}
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static int sae_derive_k_dh(struct sae_data *sae, u8 *k)
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{
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struct crypto_bignum *pwe, *peer_elem, *K, *rand_bn, *peer_scalar;
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int ret = -1;
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pwe = crypto_bignum_init_set(sae->pwe, sae->prime_len);
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peer_scalar = crypto_bignum_init_set(sae->peer_commit_scalar,
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sae->prime_len);
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peer_elem = crypto_bignum_init_set(sae->peer_commit_element,
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sae->prime_len);
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K = crypto_bignum_init();
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rand_bn = crypto_bignum_init_set(sae->sae_rand, sae->prime_len);
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if (pwe == NULL || peer_elem == NULL || peer_scalar == NULL ||
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K == NULL || rand_bn == NULL)
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goto fail;
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/*
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* K = scalar-op(rand, (elem-op(scalar-op(peer-commit-scalar, PWE),
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* PEER-COMMIT-ELEMENT)))
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* If K is identity element (one), reject.
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* k = F(K) (= x coordinate)
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*/
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if (crypto_bignum_exptmod(pwe, peer_scalar, sae->prime, K) < 0 ||
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crypto_bignum_mulmod(K, peer_elem, sae->prime, K) < 0 ||
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crypto_bignum_exptmod(K, rand_bn, sae->prime, K) < 0 ||
|
||||
crypto_bignum_to_bin(K, k, SAE_MAX_PRIME_LEN, sae->prime_len) < 0 ||
|
||||
val_one(k, sae->prime_len)) {
|
||||
wpa_printf(MSG_DEBUG, "SAE: Failed to calculate K and k");
|
||||
goto fail;
|
||||
}
|
||||
|
||||
wpa_hexdump_key(MSG_DEBUG, "SAE: k", k, sae->prime_len);
|
||||
|
||||
ret = 0;
|
||||
fail:
|
||||
crypto_bignum_deinit(pwe, 1);
|
||||
crypto_bignum_deinit(peer_elem, 0);
|
||||
crypto_bignum_deinit(K, 1);
|
||||
crypto_bignum_deinit(rand_bn, 1);
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
||||
static int sae_derive_k(struct sae_data *sae, u8 *k)
|
||||
{
|
||||
if (sae->ec)
|
||||
return sae_derive_k_ec(sae, k);
|
||||
return sae_derive_k_dh(sae, k);
|
||||
}
|
||||
|
||||
|
||||
static int sae_derive_keys(struct sae_data *sae, const u8 *k)
|
||||
{
|
||||
u8 null_key[SAE_KEYSEED_KEY_LEN], val[SAE_MAX_PRIME_LEN];
|
||||
|
|
@ -467,7 +818,8 @@ void sae_write_commit(struct sae_data *sae, struct wpabuf *buf,
|
|||
if (token)
|
||||
wpabuf_put_buf(buf, token);
|
||||
wpabuf_put_data(buf, sae->own_commit_scalar, sae->prime_len);
|
||||
wpabuf_put_data(buf, sae->own_commit_element, 2 * sae->prime_len);
|
||||
wpabuf_put_data(buf, sae->own_commit_element,
|
||||
(sae->ec ? 2 : 1) * sae->prime_len);
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -509,10 +861,15 @@ u16 sae_parse_commit(struct sae_data *sae, const u8 *data, size_t len,
|
|||
group);
|
||||
return WLAN_STATUS_FINITE_CYCLIC_GROUP_NOT_SUPPORTED;
|
||||
}
|
||||
if (sae->dh && !allowed_groups) {
|
||||
wpa_printf(MSG_DEBUG, "SAE: Do not allow FFC group %u without "
|
||||
"explicit configuration enabling it", group);
|
||||
return WLAN_STATUS_FINITE_CYCLIC_GROUP_NOT_SUPPORTED;
|
||||
}
|
||||
pos += 2;
|
||||
|
||||
if (pos + 3 * sae->prime_len < end) {
|
||||
size_t tlen = end - (pos + 3 * sae->prime_len);
|
||||
if (pos + (sae->ec ? 3 : 2) * sae->prime_len < end) {
|
||||
size_t tlen = end - (pos + (sae->ec ? 3 : 2) * sae->prime_len);
|
||||
wpa_hexdump(MSG_DEBUG, "SAE: Anti-Clogging Token", pos, tlen);
|
||||
if (token)
|
||||
*token = pos;
|
||||
|
|
@ -544,6 +901,19 @@ u16 sae_parse_commit(struct sae_data *sae, const u8 *data, size_t len,
|
|||
sae->peer_commit_scalar, sae->prime_len);
|
||||
pos += sae->prime_len;
|
||||
|
||||
if (sae->dh) {
|
||||
if (pos + sae->prime_len > end) {
|
||||
wpa_printf(MSG_DEBUG, "SAE: Not enough data for "
|
||||
"commit-element");
|
||||
return WLAN_STATUS_UNSPECIFIED_FAILURE;
|
||||
}
|
||||
os_memcpy(sae->peer_commit_element, pos, sae->prime_len);
|
||||
wpa_hexdump(MSG_DEBUG, "SAE: Peer commit-element",
|
||||
sae->peer_commit_element, sae->prime_len);
|
||||
|
||||
return WLAN_STATUS_SUCCESS;
|
||||
}
|
||||
|
||||
if (pos + 2 * sae->prime_len > end) {
|
||||
wpa_printf(MSG_DEBUG, "SAE: Not enough data for "
|
||||
"commit-element");
|
||||
|
|
@ -581,11 +951,11 @@ void sae_write_confirm(struct sae_data *sae, struct wpabuf *buf)
|
|||
addr[1] = sae->own_commit_scalar;
|
||||
len[1] = sae->prime_len;
|
||||
addr[2] = sae->own_commit_element;
|
||||
len[2] = 2 * sae->prime_len;
|
||||
len[2] = (sae->ec ? 2 : 1) * sae->prime_len;
|
||||
addr[3] = sae->peer_commit_scalar;
|
||||
len[3] = sae->prime_len;
|
||||
addr[4] = sae->peer_commit_element;
|
||||
len[4] = 2 * sae->prime_len;
|
||||
len[4] = (sae->ec ? 2 : 1) * sae->prime_len;
|
||||
hmac_sha256_vector(sae->kck, sizeof(sae->kck), 5, addr, len,
|
||||
wpabuf_put(buf, SHA256_MAC_LEN));
|
||||
}
|
||||
|
|
@ -619,11 +989,11 @@ int sae_check_confirm(struct sae_data *sae, const u8 *data, size_t len)
|
|||
addr[1] = sae->peer_commit_scalar;
|
||||
elen[1] = sae->prime_len;
|
||||
addr[2] = sae->peer_commit_element;
|
||||
elen[2] = 2 * sae->prime_len;
|
||||
elen[2] = (sae->ec ? 2 : 1) * sae->prime_len;
|
||||
addr[3] = sae->own_commit_scalar;
|
||||
elen[3] = sae->prime_len;
|
||||
addr[4] = sae->own_commit_element;
|
||||
elen[4] = 2 * sae->prime_len;
|
||||
elen[4] = (sae->ec ? 2 : 1) * sae->prime_len;
|
||||
hmac_sha256_vector(sae->kck, sizeof(sae->kck), 5, addr, elen, verifier);
|
||||
|
||||
if (os_memcmp(verifier, data + 2, SHA256_MAC_LEN) != 0) {
|
||||
|
|
|
|||
|
|
@ -13,7 +13,7 @@
|
|||
#define SAE_PMK_LEN 32
|
||||
#define SAE_PMKID_LEN 16
|
||||
#define SAE_KEYSEED_KEY_LEN 32
|
||||
#define SAE_MAX_PRIME_LEN 66
|
||||
#define SAE_MAX_PRIME_LEN 512
|
||||
#define SAE_COMMIT_MAX_LEN (2 + 3 * SAE_MAX_PRIME_LEN)
|
||||
#define SAE_CONFIRM_MAX_LEN (2 + SAE_MAX_PRIME_LEN)
|
||||
|
||||
|
|
@ -31,8 +31,12 @@ struct sae_data {
|
|||
int group;
|
||||
struct crypto_ec *ec;
|
||||
int prime_len;
|
||||
const struct dh_group *dh;
|
||||
const struct crypto_bignum *prime;
|
||||
const struct crypto_bignum *order;
|
||||
struct crypto_bignum *prime_buf;
|
||||
struct crypto_bignum *order_buf;
|
||||
int safe_prime;
|
||||
};
|
||||
|
||||
int sae_set_group(struct sae_data *sae, int group);
|
||||
|
|
|
|||
|
|
@ -183,6 +183,7 @@ ifdef CONFIG_SAE
|
|||
L_CFLAGS += -DCONFIG_SAE
|
||||
OBJS += src/common/sae.c
|
||||
NEED_ECC=y
|
||||
NEED_DH_GROUPS=y
|
||||
endif
|
||||
|
||||
ifdef CONFIG_TDLS
|
||||
|
|
|
|||
|
|
@ -176,6 +176,7 @@ ifdef CONFIG_SAE
|
|||
CFLAGS += -DCONFIG_SAE
|
||||
OBJS += ../src/common/sae.o
|
||||
NEED_ECC=y
|
||||
NEED_DH_GROUPS=y
|
||||
endif
|
||||
|
||||
ifdef CONFIG_WNM
|
||||
|
|
|
|||
Loading…
Reference in a new issue