EAP-EKE: Add peer implementation

This adds a new password-based EAP method defined in RFC 6124.

Signed-hostap: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2013-07-06 18:45:38 +03:00
parent 489202ddce
commit 7e7610d788
9 changed files with 1651 additions and 0 deletions

View file

@ -63,6 +63,7 @@ typedef enum {
EAP_TYPE_AKA_PRIME = 50 /* RFC 5448 */,
EAP_TYPE_GPSK = 51 /* RFC 5433 */,
EAP_TYPE_PWD = 52 /* RFC 5931 */,
EAP_TYPE_EKE = 53 /* RFC 6124 */,
EAP_TYPE_EXPANDED = 254 /* RFC 3748 */
} EapType;

View file

@ -0,0 +1,768 @@
/*
* EAP server/peer: EAP-EKE shared routines
* Copyright (c) 2011-2013, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#include "common.h"
#include "crypto/aes.h"
#include "crypto/aes_wrap.h"
#include "crypto/crypto.h"
#include "crypto/dh_groups.h"
#include "crypto/random.h"
#include "crypto/sha1.h"
#include "crypto/sha256.h"
#include "eap_common/eap_defs.h"
#include "eap_eke_common.h"
static int eap_eke_dh_len(u8 group)
{
switch (group) {
case EAP_EKE_DHGROUP_EKE_2:
return 128;
case EAP_EKE_DHGROUP_EKE_5:
return 192;
case EAP_EKE_DHGROUP_EKE_14:
return 256;
case EAP_EKE_DHGROUP_EKE_15:
return 384;
case EAP_EKE_DHGROUP_EKE_16:
return 512;
}
return -1;
}
static int eap_eke_dhcomp_len(u8 dhgroup, u8 encr)
{
int dhlen;
dhlen = eap_eke_dh_len(dhgroup);
if (dhlen < 0)
return -1;
if (encr != EAP_EKE_ENCR_AES128_CBC)
return -1;
return AES_BLOCK_SIZE + dhlen;
}
static const struct dh_group * eap_eke_dh_group(u8 group)
{
switch (group) {
case EAP_EKE_DHGROUP_EKE_2:
return dh_groups_get(2);
case EAP_EKE_DHGROUP_EKE_5:
return dh_groups_get(5);
case EAP_EKE_DHGROUP_EKE_14:
return dh_groups_get(14);
case EAP_EKE_DHGROUP_EKE_15:
return dh_groups_get(15);
case EAP_EKE_DHGROUP_EKE_16:
return dh_groups_get(16);
}
return NULL;
}
static int eap_eke_dh_generator(u8 group)
{
switch (group) {
case EAP_EKE_DHGROUP_EKE_2:
return 5;
case EAP_EKE_DHGROUP_EKE_5:
return 31;
case EAP_EKE_DHGROUP_EKE_14:
return 11;
case EAP_EKE_DHGROUP_EKE_15:
return 5;
case EAP_EKE_DHGROUP_EKE_16:
return 5;
}
return -1;
}
static int eap_eke_pnonce_len(u8 mac)
{
int mac_len;
if (mac == EAP_EKE_MAC_HMAC_SHA1)
mac_len = SHA1_MAC_LEN;
else if (mac == EAP_EKE_MAC_HMAC_SHA2_256)
mac_len = SHA256_MAC_LEN;
else
return -1;
return AES_BLOCK_SIZE + 16 + mac_len;
}
static int eap_eke_pnonce_ps_len(u8 mac)
{
int mac_len;
if (mac == EAP_EKE_MAC_HMAC_SHA1)
mac_len = SHA1_MAC_LEN;
else if (mac == EAP_EKE_MAC_HMAC_SHA2_256)
mac_len = SHA256_MAC_LEN;
else
return -1;
return AES_BLOCK_SIZE + 2 * 16 + mac_len;
}
static int eap_eke_prf_len(u8 prf)
{
if (prf == EAP_EKE_PRF_HMAC_SHA1)
return 20;
if (prf == EAP_EKE_PRF_HMAC_SHA2_256)
return 32;
return -1;
}
static int eap_eke_nonce_len(u8 prf)
{
int prf_len;
prf_len = eap_eke_prf_len(prf);
if (prf_len < 0)
return -1;
if (prf_len > 2 * 16)
return (prf_len + 1) / 2;
return 16;
}
static int eap_eke_auth_len(u8 prf)
{
switch (prf) {
case EAP_EKE_PRF_HMAC_SHA1:
return SHA1_MAC_LEN;
case EAP_EKE_PRF_HMAC_SHA2_256:
return SHA256_MAC_LEN;
}
return -1;
}
int eap_eke_dh_init(u8 group, u8 *ret_priv, u8 *ret_pub)
{
int generator;
u8 gen;
const struct dh_group *dh;
size_t pub_len, i;
generator = eap_eke_dh_generator(group);
if (generator < 0 || generator > 255)
return -1;
gen = generator;
dh = eap_eke_dh_group(group);
if (dh == NULL)
return -1;
/* x = random number 2 .. p-1 */
if (random_get_bytes(ret_priv, dh->prime_len))
return -1;
if (os_memcmp(ret_priv, dh->prime, dh->prime_len) > 0) {
/* Make sure private value is smaller than prime */
ret_priv[0] = 0;
}
for (i = 0; i < dh->prime_len - 1; i++) {
if (ret_priv[i])
break;
}
if (i == dh->prime_len - 1 && (ret_priv[i] == 0 || ret_priv[i] == 1))
return -1;
wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: DH private value",
ret_priv, dh->prime_len);
/* y = g ^ x (mod p) */
pub_len = dh->prime_len;
if (crypto_mod_exp(&gen, 1, ret_priv, dh->prime_len,
dh->prime, dh->prime_len, ret_pub, &pub_len) < 0)
return -1;
if (pub_len < dh->prime_len) {
size_t pad = dh->prime_len - pub_len;
os_memmove(ret_pub + pad, ret_pub, pub_len);
os_memset(ret_pub, 0, pad);
}
wpa_hexdump(MSG_DEBUG, "EAP-EKE: DH public value",
ret_pub, dh->prime_len);
return 0;
}
static int eap_eke_prf(u8 prf, const u8 *key, size_t key_len, const u8 *data,
size_t data_len, const u8 *data2, size_t data2_len,
u8 *res)
{
const u8 *addr[2];
size_t len[2];
size_t num_elem = 1;
addr[0] = data;
len[0] = data_len;
if (data2) {
num_elem++;
addr[1] = data2;
len[1] = data2_len;
}
if (prf == EAP_EKE_PRF_HMAC_SHA1)
return hmac_sha1_vector(key, key_len, num_elem, addr, len, res);
if (prf == EAP_EKE_PRF_HMAC_SHA2_256)
return hmac_sha256_vector(key, key_len, num_elem, addr, len,
res);
return -1;
}
static int eap_eke_prf_hmac_sha1(const u8 *key, size_t key_len, const u8 *data,
size_t data_len, u8 *res, size_t len)
{
u8 hash[SHA1_MAC_LEN];
u8 idx;
const u8 *addr[3];
size_t vlen[3];
int ret;
idx = 0;
addr[0] = hash;
vlen[0] = SHA1_MAC_LEN;
addr[1] = data;
vlen[1] = data_len;
addr[2] = &idx;
vlen[2] = 1;
while (len > 0) {
idx++;
if (idx == 1)
ret = hmac_sha1_vector(key, key_len, 2, &addr[1],
&vlen[1], hash);
else
ret = hmac_sha1_vector(key, key_len, 3, addr, vlen,
hash);
if (ret < 0)
return -1;
if (len > SHA1_MAC_LEN) {
os_memcpy(res, hash, SHA1_MAC_LEN);
res += SHA1_MAC_LEN;
len -= SHA1_MAC_LEN;
} else {
os_memcpy(res, hash, len);
len = 0;
}
}
return 0;
}
static int eap_eke_prf_hmac_sha256(const u8 *key, size_t key_len, const u8 *data,
size_t data_len, u8 *res, size_t len)
{
u8 hash[SHA256_MAC_LEN];
u8 idx;
const u8 *addr[3];
size_t vlen[3];
int ret;
idx = 0;
addr[0] = hash;
vlen[0] = SHA256_MAC_LEN;
addr[1] = data;
vlen[1] = data_len;
addr[2] = &idx;
vlen[2] = 1;
while (len > 0) {
idx++;
if (idx == 1)
ret = hmac_sha256_vector(key, key_len, 2, &addr[1],
&vlen[1], hash);
else
ret = hmac_sha256_vector(key, key_len, 3, addr, vlen,
hash);
if (ret < 0)
return -1;
if (len > SHA256_MAC_LEN) {
os_memcpy(res, hash, SHA256_MAC_LEN);
res += SHA256_MAC_LEN;
len -= SHA256_MAC_LEN;
} else {
os_memcpy(res, hash, len);
len = 0;
}
}
return 0;
}
static int eap_eke_prfplus(u8 prf, const u8 *key, size_t key_len,
const u8 *data, size_t data_len, u8 *res, size_t len)
{
if (prf == EAP_EKE_PRF_HMAC_SHA1)
return eap_eke_prf_hmac_sha1(key, key_len, data, data_len, res,
len);
if (prf == EAP_EKE_PRF_HMAC_SHA2_256)
return eap_eke_prf_hmac_sha256(key, key_len, data, data_len,
res, len);
return -1;
}
int eap_eke_derive_key(struct eap_eke_session *sess,
const u8 *password, size_t password_len,
const u8 *id_s, size_t id_s_len, const u8 *id_p,
size_t id_p_len, u8 *key)
{
u8 zeros[EAP_EKE_MAX_HASH_LEN];
u8 temp[EAP_EKE_MAX_HASH_LEN];
size_t key_len = 16; /* Only AES-128-CBC is used here */
u8 *id;
/* temp = prf(0+, password) */
os_memset(zeros, 0, sess->prf_len);
if (eap_eke_prf(sess->prf, zeros, sess->prf_len,
password, password_len, NULL, 0, temp) < 0)
return -1;
wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: temp = prf(0+, password)",
temp, sess->prf_len);
/* key = prf+(temp, ID_S | ID_P) */
id = os_malloc(id_s_len + id_p_len);
if (id == NULL)
return -1;
os_memcpy(id, id_s, id_s_len);
os_memcpy(id + id_s_len, id_p, id_p_len);
wpa_hexdump_ascii(MSG_DEBUG, "EAP-EKE: ID_S | ID_P",
id, id_s_len + id_p_len);
if (eap_eke_prfplus(sess->prf, temp, sess->prf_len,
id, id_s_len + id_p_len, key, key_len) < 0) {
os_free(id);
return -1;
}
os_free(id);
wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: key = prf+(temp, ID_S | ID_P)",
key, key_len);
return 0;
}
int eap_eke_dhcomp(struct eap_eke_session *sess, const u8 *key, const u8 *dhpub,
u8 *ret_dhcomp)
{
u8 pub[EAP_EKE_MAX_DH_LEN];
int dh_len;
u8 iv[AES_BLOCK_SIZE];
dh_len = eap_eke_dh_len(sess->dhgroup);
if (dh_len < 0)
return -1;
/*
* DHComponent = Encr(key, y)
*
* All defined DH groups use primes that have length devisible by 16, so
* no need to do extra padding for y (= pub).
*/
if (sess->encr != EAP_EKE_ENCR_AES128_CBC)
return -1;
if (random_get_bytes(iv, AES_BLOCK_SIZE))
return -1;
wpa_hexdump(MSG_DEBUG, "EAP-EKE: IV for Encr(key, y)",
iv, AES_BLOCK_SIZE);
os_memcpy(pub, dhpub, dh_len);
if (aes_128_cbc_encrypt(key, iv, pub, dh_len) < 0)
return -1;
os_memcpy(ret_dhcomp, iv, AES_BLOCK_SIZE);
os_memcpy(ret_dhcomp + AES_BLOCK_SIZE, pub, dh_len);
wpa_hexdump(MSG_DEBUG, "EAP-EKE: DHComponent = Encr(key, y)",
ret_dhcomp, AES_BLOCK_SIZE + dh_len);
return 0;
}
int eap_eke_shared_secret(struct eap_eke_session *sess, const u8 *key,
const u8 *dhpriv, const u8 *peer_dhcomp)
{
u8 zeros[EAP_EKE_MAX_HASH_LEN];
u8 peer_pub[EAP_EKE_MAX_DH_LEN];
u8 modexp[EAP_EKE_MAX_DH_LEN];
size_t len;
const struct dh_group *dh;
if (sess->encr != EAP_EKE_ENCR_AES128_CBC)
return -1;
dh = eap_eke_dh_group(sess->dhgroup);
if (dh == NULL)
return -1;
/* Decrypt peer DHComponent */
os_memcpy(peer_pub, peer_dhcomp + AES_BLOCK_SIZE, dh->prime_len);
if (aes_128_cbc_decrypt(key, peer_dhcomp, peer_pub, dh->prime_len) < 0) {
wpa_printf(MSG_INFO, "EAP-EKE: Failed to decrypt DHComponent");
return -1;
}
wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Decrypted peer DH pubkey",
peer_pub, dh->prime_len);
/* SharedSecret = prf(0+, g ^ (x_s * x_p) (mod p)) */
len = dh->prime_len;
if (crypto_mod_exp(peer_pub, dh->prime_len, dhpriv, dh->prime_len,
dh->prime, dh->prime_len, modexp, &len) < 0)
return -1;
if (len < dh->prime_len) {
size_t pad = dh->prime_len - len;
os_memmove(modexp + pad, modexp, len);
os_memset(modexp, 0, pad);
}
os_memset(zeros, 0, sess->auth_len);
if (eap_eke_prf(sess->prf, zeros, sess->auth_len, modexp, dh->prime_len,
NULL, 0, sess->shared_secret) < 0)
return -1;
wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: SharedSecret",
sess->shared_secret, sess->auth_len);
return 0;
}
int eap_eke_derive_ke_ki(struct eap_eke_session *sess,
const u8 *id_s, size_t id_s_len,
const u8 *id_p, size_t id_p_len)
{
u8 buf[EAP_EKE_MAX_KE_LEN + EAP_EKE_MAX_KI_LEN];
size_t ke_len, ki_len;
u8 *data;
size_t data_len;
const char *label = "EAP-EKE Keys";
size_t label_len;
/*
* Ke | Ki = prf+(SharedSecret, "EAP-EKE Keys" | ID_S | ID_P)
* Ke = encryption key
* Ki = integrity protection key
* Length of each key depends on the selected algorithms.
*/
if (sess->encr == EAP_EKE_ENCR_AES128_CBC)
ke_len = 16;
else
return -1;
if (sess->mac == EAP_EKE_PRF_HMAC_SHA1)
ki_len = 20;
else if (sess->mac == EAP_EKE_PRF_HMAC_SHA2_256)
ki_len = 32;
else
return -1;
label_len = os_strlen(label);
data_len = label_len + id_s_len + id_p_len;
data = os_malloc(data_len);
if (data == NULL)
return -1;
os_memcpy(data, label, label_len);
os_memcpy(data + label_len, id_s, id_s_len);
os_memcpy(data + label_len + id_s_len, id_p, id_p_len);
if (eap_eke_prfplus(sess->prf, sess->shared_secret, sess->prf_len,
data, data_len, buf, ke_len + ki_len) < 0) {
os_free(data);
return -1;
}
os_memcpy(sess->ke, buf, ke_len);
wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Ke", sess->ke, ke_len);
os_memcpy(sess->ki, buf + ke_len, ki_len);
wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Ki", sess->ki, ki_len);
os_free(data);
return 0;
}
int eap_eke_derive_ka(struct eap_eke_session *sess,
const u8 *id_s, size_t id_s_len,
const u8 *id_p, size_t id_p_len,
const u8 *nonce_p, const u8 *nonce_s)
{
u8 *data, *pos;
size_t data_len;
const char *label = "EAP-EKE Ka";
size_t label_len;
/*
* Ka = prf+(SharedSecret, "EAP-EKE Ka" | ID_S | ID_P | Nonce_P |
* Nonce_S)
* Ka = authentication key
* Length of the key depends on the selected algorithms.
*/
label_len = os_strlen(label);
data_len = label_len + id_s_len + id_p_len + 2 * sess->nonce_len;
data = os_malloc(data_len);
if (data == NULL)
return -1;
pos = data;
os_memcpy(pos, label, label_len);
pos += label_len;
os_memcpy(pos, id_s, id_s_len);
pos += id_s_len;
os_memcpy(pos, id_p, id_p_len);
pos += id_p_len;
os_memcpy(pos, nonce_p, sess->nonce_len);
pos += sess->nonce_len;
os_memcpy(pos, nonce_s, sess->nonce_len);
if (eap_eke_prfplus(sess->prf, sess->shared_secret, sess->prf_len,
data, data_len, sess->ka, sess->prf_len) < 0) {
os_free(data);
return -1;
}
os_free(data);
wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Ka", sess->ka, sess->prf_len);
return 0;
}
int eap_eke_derive_msk(struct eap_eke_session *sess,
const u8 *id_s, size_t id_s_len,
const u8 *id_p, size_t id_p_len,
const u8 *nonce_p, const u8 *nonce_s,
u8 *msk, u8 *emsk)
{
u8 *data, *pos;
size_t data_len;
const char *label = "EAP-EKE Exported Keys";
size_t label_len;
u8 buf[EAP_MSK_LEN + EAP_EMSK_LEN];
/*
* MSK | EMSK = prf+(SharedSecret, "EAP-EKE Exported Keys" | ID_S |
* ID_P | Nonce_P | Nonce_S)
*/
label_len = os_strlen(label);
data_len = label_len + id_s_len + id_p_len + 2 * sess->nonce_len;
data = os_malloc(data_len);
if (data == NULL)
return -1;
pos = data;
os_memcpy(pos, label, label_len);
pos += label_len;
os_memcpy(pos, id_s, id_s_len);
pos += id_s_len;
os_memcpy(pos, id_p, id_p_len);
pos += id_p_len;
os_memcpy(pos, nonce_p, sess->nonce_len);
pos += sess->nonce_len;
os_memcpy(pos, nonce_s, sess->nonce_len);
if (eap_eke_prfplus(sess->prf, sess->shared_secret, sess->prf_len,
data, data_len, buf, EAP_MSK_LEN + EAP_EMSK_LEN) <
0) {
os_free(data);
return -1;
}
os_free(data);
os_memcpy(msk, buf, EAP_MSK_LEN);
os_memcpy(emsk, buf + EAP_MSK_LEN, EAP_EMSK_LEN);
os_memset(buf, 0, sizeof(buf));
wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: MSK", msk, EAP_MSK_LEN);
wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: EMSK", msk, EAP_EMSK_LEN);
return 0;
}
static int eap_eke_mac(u8 mac, const u8 *key, const u8 *data, size_t data_len,
u8 *res)
{
if (mac == EAP_EKE_MAC_HMAC_SHA1)
return hmac_sha1(key, SHA1_MAC_LEN, data, data_len, res);
if (mac == EAP_EKE_MAC_HMAC_SHA2_256)
return hmac_sha256(key, SHA256_MAC_LEN, data, data_len, res);
return -1;
}
int eap_eke_prot(struct eap_eke_session *sess,
const u8 *data, size_t data_len,
u8 *prot, size_t *prot_len)
{
size_t block_size, icv_len, pad;
u8 *pos, *iv, *e;
if (sess->encr == EAP_EKE_ENCR_AES128_CBC)
block_size = AES_BLOCK_SIZE;
else
return -1;
if (sess->mac == EAP_EKE_PRF_HMAC_SHA1)
icv_len = SHA1_MAC_LEN;
else if (sess->mac == EAP_EKE_PRF_HMAC_SHA2_256)
icv_len = SHA256_MAC_LEN;
else
return -1;
pad = data_len % block_size;
if (pad)
pad = block_size - pad;
if (*prot_len < block_size + data_len + pad + icv_len) {
wpa_printf(MSG_INFO, "EAP-EKE: Not enough room for Prot() data");
}
pos = prot;
if (random_get_bytes(pos, block_size))
return -1;
iv = pos;
wpa_hexdump(MSG_DEBUG, "EAP-EKE: IV for Prot()", iv, block_size);
pos += block_size;
e = pos;
os_memcpy(pos, data, data_len);
pos += data_len;
if (pad) {
if (random_get_bytes(pos, pad))
return -1;
pos += pad;
}
if (aes_128_cbc_encrypt(sess->ke, iv, e, data_len + pad) < 0)
return -1;
if (eap_eke_mac(sess->mac, sess->ki, e, data_len + pad, pos) < 0)
return -1;
pos += icv_len;
*prot_len = pos - prot;
return 0;
}
int eap_eke_decrypt_prot(struct eap_eke_session *sess,
const u8 *prot, size_t prot_len,
u8 *data, size_t *data_len)
{
size_t block_size, icv_len;
u8 icv[EAP_EKE_MAX_HASH_LEN];
if (sess->encr == EAP_EKE_ENCR_AES128_CBC)
block_size = AES_BLOCK_SIZE;
else
return -1;
if (sess->mac == EAP_EKE_PRF_HMAC_SHA1)
icv_len = SHA1_MAC_LEN;
else if (sess->mac == EAP_EKE_PRF_HMAC_SHA2_256)
icv_len = SHA256_MAC_LEN;
else
return -1;
if (prot_len < 2 * block_size + icv_len)
return -1;
if ((prot_len - icv_len) % block_size)
return -1;
if (eap_eke_mac(sess->mac, sess->ki, prot + block_size,
prot_len - block_size - icv_len, icv) < 0)
return -1;
if (os_memcmp(icv, prot + prot_len - icv_len, icv_len) != 0) {
wpa_printf(MSG_INFO, "EAP-EKE: ICV mismatch in Prot() data");
return -1;
}
if (*data_len < prot_len - block_size - icv_len) {
wpa_printf(MSG_INFO, "EAP-EKE: Not enough room for decrypted Prot() data");
return -1;
}
*data_len = prot_len - block_size - icv_len;
os_memcpy(data, prot + block_size, *data_len);
if (aes_128_cbc_decrypt(sess->ke, prot, data, *data_len) < 0) {
wpa_printf(MSG_INFO, "EAP-EKE: Failed to decrypt Prot() data");
return -1;
}
wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Decrypted Prot() data",
data, *data_len);
return 0;
}
int eap_eke_auth(struct eap_eke_session *sess, const char *label,
const struct wpabuf *msgs, u8 *auth)
{
wpa_printf(MSG_DEBUG, "EAP-EKE: Auth(%s)", label);
wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Ka for Auth",
sess->ka, sess->auth_len);
wpa_hexdump_buf(MSG_MSGDUMP, "EAP-EKE: Messages for Auth", msgs);
return eap_eke_prf(sess->prf, sess->ka, sess->auth_len,
(const u8 *) label, os_strlen(label),
wpabuf_head(msgs), wpabuf_len(msgs), auth);
}
int eap_eke_session_init(struct eap_eke_session *sess, u8 dhgroup, u8 encr,
u8 prf, u8 mac)
{
sess->dhgroup = dhgroup;
sess->encr = encr;
sess->prf = prf;
sess->mac = mac;
sess->prf_len = eap_eke_prf_len(prf);
if (sess->prf_len < 0)
return -1;
sess->nonce_len = eap_eke_nonce_len(prf);
if (sess->nonce_len < 0)
return -1;
sess->auth_len = eap_eke_auth_len(prf);
if (sess->auth_len < 0)
return -1;
sess->dhcomp_len = eap_eke_dhcomp_len(sess->dhgroup, sess->encr);
if (sess->dhcomp_len < 0)
return -1;
sess->pnonce_len = eap_eke_pnonce_len(sess->mac);
if (sess->pnonce_len < 0)
return -1;
sess->pnonce_ps_len = eap_eke_pnonce_ps_len(sess->mac);
if (sess->pnonce_ps_len < 0)
return -1;
return 0;
}
void eap_eke_session_clean(struct eap_eke_session *sess)
{
os_memset(sess->shared_secret, 0, EAP_EKE_MAX_HASH_LEN);
os_memset(sess->ke, 0, EAP_EKE_MAX_KE_LEN);
os_memset(sess->ki, 0, EAP_EKE_MAX_KI_LEN);
os_memset(sess->ka, 0, EAP_EKE_MAX_KA_LEN);
}

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/*
* EAP server/peer: EAP-EKE shared routines
* Copyright (c) 2011-2013, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#ifndef EAP_EKE_COMMON_H
#define EAP_EKE_COMMON_H
/* EKE Exchange */
#define EAP_EKE_ID 1
#define EAP_EKE_COMMIT 2
#define EAP_EKE_CONFIRM 3
#define EAP_EKE_FAILURE 4
/* Diffie-Hellman Group Registry */
#define EAP_EKE_DHGROUP_EKE_2 1
#define EAP_EKE_DHGROUP_EKE_5 2
#define EAP_EKE_DHGROUP_EKE_14 3 /* mandatory to implement */
#define EAP_EKE_DHGROUP_EKE_15 4
#define EAP_EKE_DHGROUP_EKE_16 5
/* Encryption Algorithm Registry */
#define EAP_EKE_ENCR_AES128_CBC 1 /* mandatory to implement */
/* Pseudo Random Function Registry */
#define EAP_EKE_PRF_HMAC_SHA1 1 /* mandatory to implement */
#define EAP_EKE_PRF_HMAC_SHA2_256 2
/* Keyed Message Digest (MAC) Registry */
#define EAP_EKE_MAC_HMAC_SHA1 1 /* mandatory to implement */
#define EAP_EKE_MAC_HMAC_SHA2_256 2
/* Identity Type Registry */
#define EAP_EKE_ID_OPAQUE 1
#define EAP_EKE_ID_NAI 2
#define EAP_EKE_ID_IPv4 3
#define EAP_EKE_ID_IPv6 4
#define EAP_EKE_ID_FQDN 5
#define EAP_EKE_ID_DN 6
/* Failure-Code */
#define EAP_EKE_FAIL_NO_ERROR 1
#define EAP_EKE_FAIL_PROTO_ERROR 2
#define EAP_EKE_FAIL_PASSWD_NOT_FOUND 3
#define EAP_EKE_FAIL_AUTHENTICATION_FAIL 4
#define EAP_EKE_FAIL_AUTHORIZATION_FAIL 5
#define EAP_EKE_FAIL_NO_PROPOSAL_CHOSEN 6
#define EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR 0xffffffff
#define EAP_EKE_MAX_DH_LEN 512
#define EAP_EKE_MAX_HASH_LEN 32
#define EAP_EKE_MAX_KEY_LEN 16
#define EAP_EKE_MAX_KE_LEN 16
#define EAP_EKE_MAX_KI_LEN 32
#define EAP_EKE_MAX_KA_LEN 32
#define EAP_EKE_MAX_NONCE_LEN 16
struct eap_eke_session {
/* Selected proposal */
u8 dhgroup;
u8 encr;
u8 prf;
u8 mac;
u8 shared_secret[EAP_EKE_MAX_HASH_LEN];
u8 ke[EAP_EKE_MAX_KE_LEN];
u8 ki[EAP_EKE_MAX_KI_LEN];
u8 ka[EAP_EKE_MAX_KA_LEN];
int prf_len;
int nonce_len;
int auth_len;
int dhcomp_len;
int pnonce_len;
int pnonce_ps_len;
};
int eap_eke_session_init(struct eap_eke_session *sess, u8 dhgroup, u8 encr,
u8 prf, u8 mac);
void eap_eke_session_clean(struct eap_eke_session *sess);
int eap_eke_dh_init(u8 group, u8 *ret_priv, u8 *ret_pub);
int eap_eke_derive_key(struct eap_eke_session *sess,
const u8 *password, size_t password_len,
const u8 *id_s, size_t id_s_len, const u8 *id_p,
size_t id_p_len, u8 *key);
int eap_eke_dhcomp(struct eap_eke_session *sess, const u8 *key, const u8 *dhpub,
u8 *ret_dhcomp);
int eap_eke_shared_secret(struct eap_eke_session *sess, const u8 *key,
const u8 *dhpriv, const u8 *peer_dhcomp);
int eap_eke_derive_ke_ki(struct eap_eke_session *sess,
const u8 *id_s, size_t id_s_len,
const u8 *id_p, size_t id_p_len);
int eap_eke_derive_ka(struct eap_eke_session *sess,
const u8 *id_s, size_t id_s_len,
const u8 *id_p, size_t id_p_len,
const u8 *nonce_p, const u8 *nonce_s);
int eap_eke_derive_msk(struct eap_eke_session *sess,
const u8 *id_s, size_t id_s_len,
const u8 *id_p, size_t id_p_len,
const u8 *nonce_p, const u8 *nonce_s,
u8 *msk, u8 *emsk);
int eap_eke_prot(struct eap_eke_session *sess,
const u8 *data, size_t data_len,
u8 *prot, size_t *prot_len);
int eap_eke_decrypt_prot(struct eap_eke_session *sess,
const u8 *prot, size_t prot_len,
u8 *data, size_t *data_len);
int eap_eke_auth(struct eap_eke_session *sess, const char *label,
const struct wpabuf *msgs, u8 *auth);
#endif /* EAP_EKE_COMMON_H */

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src/eap_peer/eap_eke.c Normal file
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/*
* EAP peer method: EAP-EKE (RFC 6124)
* Copyright (c) 2013, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#include "common.h"
#include "crypto/random.h"
#include "eap_peer/eap_i.h"
#include "eap_common/eap_eke_common.h"
struct eap_eke_data {
enum {
IDENTITY, COMMIT, CONFIRM, SUCCESS, FAILURE
} state;
u8 msk[EAP_MSK_LEN];
u8 emsk[EAP_EMSK_LEN];
u8 *peerid;
size_t peerid_len;
u8 *serverid;
size_t serverid_len;
u8 dh_priv[EAP_EKE_MAX_DH_LEN];
struct eap_eke_session sess;
u8 nonce_p[EAP_EKE_MAX_NONCE_LEN];
u8 nonce_s[EAP_EKE_MAX_NONCE_LEN];
struct wpabuf *msgs;
};
static const char * eap_eke_state_txt(int state)
{
switch (state) {
case IDENTITY:
return "IDENTITY";
case COMMIT:
return "COMMIT";
case CONFIRM:
return "CONFIRM";
case SUCCESS:
return "SUCCESS";
case FAILURE:
return "FAILURE";
default:
return "?";
}
}
static void eap_eke_state(struct eap_eke_data *data, int state)
{
wpa_printf(MSG_DEBUG, "EAP-EKE: %s -> %s",
eap_eke_state_txt(data->state), eap_eke_state_txt(state));
data->state = state;
}
static void eap_eke_deinit(struct eap_sm *sm, void *priv);
static void * eap_eke_init(struct eap_sm *sm)
{
struct eap_eke_data *data;
const u8 *identity, *password;
size_t identity_len, password_len;
password = eap_get_config_password(sm, &password_len);
if (!password) {
wpa_printf(MSG_INFO, "EAP-EKE: No password configured");
return NULL;
}
data = os_zalloc(sizeof(*data));
if (data == NULL)
return NULL;
eap_eke_state(data, IDENTITY);
identity = eap_get_config_identity(sm, &identity_len);
if (identity) {
data->peerid = os_malloc(identity_len);
if (data->peerid == NULL) {
eap_eke_deinit(sm, data);
return NULL;
}
os_memcpy(data->peerid, identity, identity_len);
data->peerid_len = identity_len;
}
return data;
}
static void eap_eke_deinit(struct eap_sm *sm, void *priv)
{
struct eap_eke_data *data = priv;
eap_eke_session_clean(&data->sess);
os_free(data->serverid);
os_free(data->peerid);
wpabuf_free(data->msgs);
os_free(data);
}
static struct wpabuf * eap_eke_build_msg(struct eap_eke_data *data, int id,
size_t length, u8 eke_exch)
{
struct wpabuf *msg;
size_t plen;
plen = 1 + length;
msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_EKE, plen,
EAP_CODE_RESPONSE, id);
if (msg == NULL) {
wpa_printf(MSG_ERROR, "EAP-EKE: Failed to allocate memory");
return NULL;
}
wpabuf_put_u8(msg, eke_exch);
return msg;
}
static int eap_eke_supp_dhgroup(u8 dhgroup)
{
return dhgroup == EAP_EKE_DHGROUP_EKE_2 ||
dhgroup == EAP_EKE_DHGROUP_EKE_5 ||
dhgroup == EAP_EKE_DHGROUP_EKE_14 ||
dhgroup == EAP_EKE_DHGROUP_EKE_15 ||
dhgroup == EAP_EKE_DHGROUP_EKE_16;
}
static int eap_eke_supp_encr(u8 encr)
{
return encr == EAP_EKE_ENCR_AES128_CBC;
}
static int eap_eke_supp_prf(u8 prf)
{
return prf == EAP_EKE_PRF_HMAC_SHA1 ||
prf == EAP_EKE_PRF_HMAC_SHA2_256;
}
static int eap_eke_supp_mac(u8 mac)
{
return mac == EAP_EKE_MAC_HMAC_SHA1 ||
mac == EAP_EKE_MAC_HMAC_SHA2_256;
}
static struct wpabuf * eap_eke_build_fail(struct eap_eke_data *data,
struct eap_method_ret *ret,
const struct wpabuf *reqData,
u32 failure_code)
{
struct wpabuf *resp;
wpa_printf(MSG_DEBUG, "EAP-EKE: Sending EAP-EKE-Failure/Response - code=0x%x",
failure_code);
resp = eap_eke_build_msg(data, eap_get_id(reqData), 4, EAP_EKE_FAILURE);
if (resp)
wpabuf_put_be32(resp, failure_code);
os_memset(data->dh_priv, 0, sizeof(data->dh_priv));
eap_eke_session_clean(&data->sess);
eap_eke_state(data, FAILURE);
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
ret->allowNotifications = FALSE;
return resp;
}
static struct wpabuf * eap_eke_process_id(struct eap_eke_data *data,
struct eap_method_ret *ret,
const struct wpabuf *reqData,
const u8 *payload,
size_t payload_len)
{
struct wpabuf *resp;
unsigned num_prop, i;
const u8 *pos, *end;
const u8 *prop = NULL;
u8 idtype;
if (data->state != IDENTITY) {
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PROTO_ERROR);
}
wpa_printf(MSG_DEBUG, "EAP-EKE: Received EAP-EKE-ID/Request");
if (payload_len < 2 + 4) {
wpa_printf(MSG_DEBUG, "EAP-EKE: Too short ID/Request Data");
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PROTO_ERROR);
}
pos = payload;
end = payload + payload_len;
num_prop = *pos++;
pos++; /* Ignore Reserved field */
if (pos + num_prop * 4 > end) {
wpa_printf(MSG_DEBUG, "EAP-EKE: Too short ID/Request Data (num_prop=%u)",
num_prop);
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PROTO_ERROR);
}
for (i = 0; i < num_prop; i++) {
const u8 *tmp = pos;
wpa_printf(MSG_DEBUG, "EAP-EKE: Proposal #%u: dh=%u encr=%u prf=%u mac=%u",
i, pos[0], pos[1], pos[2], pos[3]);
pos += 4;
if (!eap_eke_supp_dhgroup(*tmp))
continue;
tmp++;
if (!eap_eke_supp_encr(*tmp))
continue;
tmp++;
if (!eap_eke_supp_prf(*tmp))
continue;
tmp++;
if (!eap_eke_supp_mac(*tmp))
continue;
prop = tmp - 3;
if (eap_eke_session_init(&data->sess, prop[0], prop[1], prop[2],
prop[3]) < 0) {
prop = NULL;
continue;
}
wpa_printf(MSG_DEBUG, "EAP-EKE: Selected proposal");
break;
}
if (prop == NULL) {
wpa_printf(MSG_DEBUG, "EAP-EKE: No acceptable proposal found");
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_NO_PROPOSAL_CHOSEN);
}
pos += (num_prop - i - 1) * 4;
if (pos == end) {
wpa_printf(MSG_DEBUG, "EAP-EKE: Too short ID/Request Data to include IDType/Identity");
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PROTO_ERROR);
}
idtype = *pos++;
wpa_printf(MSG_DEBUG, "EAP-EKE: Server IDType %u", idtype);
wpa_hexdump_ascii(MSG_DEBUG, "EAP-EKE: Server Identity",
pos, end - pos);
os_free(data->serverid);
data->serverid = os_malloc(end - pos);
if (data->serverid == NULL) {
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
os_memcpy(data->serverid, pos, end - pos);
data->serverid_len = end - pos;
wpa_printf(MSG_DEBUG, "EAP-EKE: Sending EAP-EKE-ID/Response");
resp = eap_eke_build_msg(data, eap_get_id(reqData),
2 + 4 + 1 + data->peerid_len,
EAP_EKE_ID);
if (resp == NULL) {
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
wpabuf_put_u8(resp, 1); /* NumProposals */
wpabuf_put_u8(resp, 0); /* Reserved */
wpabuf_put_data(resp, prop, 4); /* Selected Proposal */
wpabuf_put_u8(resp, EAP_EKE_ID_NAI);
if (data->peerid)
wpabuf_put_data(resp, data->peerid, data->peerid_len);
wpabuf_free(data->msgs);
data->msgs = wpabuf_alloc(wpabuf_len(reqData) + wpabuf_len(resp));
if (data->msgs == NULL) {
wpabuf_free(resp);
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
wpabuf_put_buf(data->msgs, reqData);
wpabuf_put_buf(data->msgs, resp);
eap_eke_state(data, COMMIT);
return resp;
}
static struct wpabuf * eap_eke_process_commit(struct eap_sm *sm,
struct eap_eke_data *data,
struct eap_method_ret *ret,
const struct wpabuf *reqData,
const u8 *payload,
size_t payload_len)
{
struct wpabuf *resp;
const u8 *pos, *end, *dhcomp;
size_t prot_len;
u8 *rpos;
u8 key[EAP_EKE_MAX_KEY_LEN];
u8 pub[EAP_EKE_MAX_DH_LEN];
const u8 *password;
size_t password_len;
if (data->state != COMMIT) {
wpa_printf(MSG_DEBUG, "EAP-EKE: EAP-EKE-Commit/Request received in unexpected state (%d)", data->state);
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PROTO_ERROR);
}
wpa_printf(MSG_DEBUG, "EAP-EKE: Received EAP-EKE-Commit/Request");
password = eap_get_config_password(sm, &password_len);
if (password == NULL) {
wpa_printf(MSG_INFO, "EAP-EKE: No password configured!");
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PASSWD_NOT_FOUND);
}
pos = payload;
end = payload + payload_len;
if (pos + data->sess.dhcomp_len > end) {
wpa_printf(MSG_DEBUG, "EAP-EKE: Too short EAP-EKE-Commit");
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PROTO_ERROR);
}
wpa_hexdump(MSG_DEBUG, "EAP-EKE: DHComponent_S",
pos, data->sess.dhcomp_len);
dhcomp = pos;
pos += data->sess.dhcomp_len;
wpa_hexdump(MSG_DEBUG, "EAP-EKE: CBValue", pos, end - pos);
/*
* temp = prf(0+, password)
* key = prf+(temp, ID_S | ID_P)
*/
if (eap_eke_derive_key(&data->sess, password, password_len,
data->serverid, data->serverid_len,
data->peerid, data->peerid_len, key) < 0) {
wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive key");
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
/*
* y_p = g ^ x_p (mod p)
* x_p = random number 2 .. p-1
*/
if (eap_eke_dh_init(data->sess.dhgroup, data->dh_priv, pub) < 0) {
wpa_printf(MSG_INFO, "EAP-EKE: Failed to initialize DH");
os_memset(key, 0, sizeof(key));
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
if (eap_eke_shared_secret(&data->sess, key, data->dh_priv, dhcomp) < 0)
{
wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive shared secret");
os_memset(key, 0, sizeof(key));
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
if (eap_eke_derive_ke_ki(&data->sess,
data->serverid, data->serverid_len,
data->peerid, data->peerid_len) < 0) {
wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive Ke/Ki");
os_memset(key, 0, sizeof(key));
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
wpa_printf(MSG_DEBUG, "EAP-EKE: Sending EAP-EKE-Commit/Response");
resp = eap_eke_build_msg(data, eap_get_id(reqData),
data->sess.dhcomp_len + data->sess.pnonce_len,
EAP_EKE_COMMIT);
if (resp == NULL) {
os_memset(key, 0, sizeof(key));
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
/* DHComponent_P = Encr(key, y_p) */
rpos = wpabuf_put(resp, data->sess.dhcomp_len);
if (eap_eke_dhcomp(&data->sess, key, pub, rpos) < 0) {
wpa_printf(MSG_INFO, "EAP-EKE: Failed to build DHComponent_S");
os_memset(key, 0, sizeof(key));
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
os_memset(key, 0, sizeof(key));
wpa_hexdump(MSG_DEBUG, "EAP-EKE: DHComponent_P",
rpos, data->sess.dhcomp_len);
if (random_get_bytes(data->nonce_p, data->sess.nonce_len)) {
wpabuf_free(resp);
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Nonce_P",
data->nonce_p, data->sess.nonce_len);
prot_len = wpabuf_tailroom(resp);
if (eap_eke_prot(&data->sess, data->nonce_p, data->sess.nonce_len,
wpabuf_put(resp, 0), &prot_len) < 0) {
wpabuf_free(resp);
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
wpa_hexdump(MSG_DEBUG, "EAP-EKE: PNonce_P",
wpabuf_put(resp, 0), prot_len);
wpabuf_put(resp, prot_len);
/* TODO: CBValue */
if (wpabuf_resize(&data->msgs, wpabuf_len(reqData) + wpabuf_len(resp))
< 0) {
wpabuf_free(resp);
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
wpabuf_put_buf(data->msgs, reqData);
wpabuf_put_buf(data->msgs, resp);
eap_eke_state(data, CONFIRM);
return resp;
}
static struct wpabuf * eap_eke_process_confirm(struct eap_eke_data *data,
struct eap_method_ret *ret,
const struct wpabuf *reqData,
const u8 *payload,
size_t payload_len)
{
struct wpabuf *resp;
const u8 *pos, *end;
size_t prot_len;
u8 nonces[2 * EAP_EKE_MAX_NONCE_LEN];
u8 auth_s[EAP_EKE_MAX_HASH_LEN];
size_t decrypt_len;
u8 *auth;
if (data->state != CONFIRM) {
wpa_printf(MSG_DEBUG, "EAP-EKE: EAP-EKE-Confirm/Request received in unexpected state (%d)",
data->state);
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PROTO_ERROR);
}
wpa_printf(MSG_DEBUG, "EAP-EKE: Received EAP-EKE-Confirm/Request");
pos = payload;
end = payload + payload_len;
if (pos + data->sess.pnonce_ps_len + data->sess.prf_len > end) {
wpa_printf(MSG_DEBUG, "EAP-EKE: Too short EAP-EKE-Commit");
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PROTO_ERROR);
}
decrypt_len = sizeof(nonces);
if (eap_eke_decrypt_prot(&data->sess, pos, data->sess.pnonce_ps_len,
nonces, &decrypt_len) < 0) {
wpa_printf(MSG_INFO, "EAP-EKE: Failed to decrypt PNonce_PS");
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_AUTHENTICATION_FAIL);
}
if (decrypt_len != (size_t) 2 * data->sess.nonce_len) {
wpa_printf(MSG_INFO, "EAP-EKE: PNonce_PS protected data length does not match length of Nonce_P and Nonce_S");
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_AUTHENTICATION_FAIL);
}
wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Received Nonce_P | Nonce_S",
nonces, 2 * data->sess.nonce_len);
if (os_memcmp(data->nonce_p, nonces, data->sess.nonce_len) != 0) {
wpa_printf(MSG_INFO, "EAP-EKE: Received Nonce_P does not match trnsmitted Nonce_P");
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_AUTHENTICATION_FAIL);
}
os_memcpy(data->nonce_s, nonces + data->sess.nonce_len,
data->sess.nonce_len);
wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Nonce_S",
data->nonce_s, data->sess.nonce_len);
if (eap_eke_derive_ka(&data->sess, data->serverid, data->serverid_len,
data->peerid, data->peerid_len,
data->nonce_p, data->nonce_s) < 0) {
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
if (eap_eke_auth(&data->sess, "EAP-EKE server", data->msgs, auth_s) < 0)
{
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
wpa_hexdump(MSG_DEBUG, "EAP-EKE: Auth_S", auth_s, data->sess.prf_len);
if (os_memcmp(auth_s, pos + data->sess.pnonce_ps_len,
data->sess.prf_len) != 0) {
wpa_printf(MSG_INFO, "EAP-EKE: Auth_S does not match");
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_AUTHENTICATION_FAIL);
}
wpa_printf(MSG_DEBUG, "EAP-EKE: Sending EAP-EKE-Confirm/Response");
resp = eap_eke_build_msg(data, eap_get_id(reqData),
data->sess.pnonce_len + data->sess.prf_len,
EAP_EKE_CONFIRM);
if (resp == NULL) {
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
prot_len = wpabuf_tailroom(resp);
if (eap_eke_prot(&data->sess, data->nonce_s, data->sess.nonce_len,
wpabuf_put(resp, 0), &prot_len) < 0) {
wpabuf_free(resp);
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
wpabuf_put(resp, prot_len);
auth = wpabuf_put(resp, data->sess.prf_len);
if (eap_eke_auth(&data->sess, "EAP-EKE peer", data->msgs, auth) < 0) {
wpabuf_free(resp);
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
wpa_hexdump(MSG_DEBUG, "EAP-EKE: Auth_P", auth, data->sess.prf_len);
if (eap_eke_derive_msk(&data->sess, data->serverid, data->serverid_len,
data->peerid, data->peerid_len,
data->nonce_s, data->nonce_p,
data->msk, data->emsk) < 0) {
wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive MSK/EMSK");
wpabuf_free(resp);
return eap_eke_build_fail(data, ret, reqData,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
os_memset(data->dh_priv, 0, sizeof(data->dh_priv));
eap_eke_session_clean(&data->sess);
eap_eke_state(data, SUCCESS);
ret->methodState = METHOD_MAY_CONT;
ret->decision = DECISION_COND_SUCC;
ret->allowNotifications = FALSE;
return resp;
}
static struct wpabuf * eap_eke_process_failure(struct eap_eke_data *data,
struct eap_method_ret *ret,
const struct wpabuf *reqData,
const u8 *payload,
size_t payload_len)
{
wpa_printf(MSG_DEBUG, "EAP-EKE: Received EAP-EKE-Failure/Request");
if (payload_len < 4) {
wpa_printf(MSG_DEBUG, "EAP-EKE: Too short EAP-EKE-Failure");
} else {
u32 code;
code = WPA_GET_BE32(payload);
wpa_printf(MSG_INFO, "EAP-EKE: Failure-Code 0x%x", code);
}
return eap_eke_build_fail(data, ret, reqData, EAP_EKE_FAIL_NO_ERROR);
}
static struct wpabuf * eap_eke_process(struct eap_sm *sm, void *priv,
struct eap_method_ret *ret,
const struct wpabuf *reqData)
{
struct eap_eke_data *data = priv;
struct wpabuf *resp;
const u8 *pos, *end;
size_t len;
u8 eke_exch;
pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_EKE, reqData, &len);
if (pos == NULL || len < 1) {
ret->ignore = TRUE;
return NULL;
}
end = pos + len;
eke_exch = *pos++;
wpa_printf(MSG_DEBUG, "EAP-EKE: Received frame: exch %d", eke_exch);
wpa_hexdump(MSG_DEBUG, "EAP-EKE: Received Data", pos, end - pos);
ret->ignore = FALSE;
ret->methodState = METHOD_MAY_CONT;
ret->decision = DECISION_FAIL;
ret->allowNotifications = TRUE;
switch (eke_exch) {
case EAP_EKE_ID:
resp = eap_eke_process_id(data, ret, reqData, pos, end - pos);
break;
case EAP_EKE_COMMIT:
resp = eap_eke_process_commit(sm, data, ret, reqData,
pos, end - pos);
break;
case EAP_EKE_CONFIRM:
resp = eap_eke_process_confirm(data, ret, reqData,
pos, end - pos);
break;
case EAP_EKE_FAILURE:
resp = eap_eke_process_failure(data, ret, reqData,
pos, end - pos);
break;
default:
wpa_printf(MSG_DEBUG, "EAP-EKE: Ignoring message with unknown EKE-Exch %d", eke_exch);
ret->ignore = TRUE;
return NULL;
}
if (ret->methodState == METHOD_DONE)
ret->allowNotifications = FALSE;
return resp;
}
static Boolean eap_eke_isKeyAvailable(struct eap_sm *sm, void *priv)
{
struct eap_eke_data *data = priv;
return data->state == SUCCESS;
}
static u8 * eap_eke_getKey(struct eap_sm *sm, void *priv, size_t *len)
{
struct eap_eke_data *data = priv;
u8 *key;
if (data->state != SUCCESS)
return NULL;
key = os_malloc(EAP_MSK_LEN);
if (key == NULL)
return NULL;
os_memcpy(key, data->msk, EAP_MSK_LEN);
*len = EAP_MSK_LEN;
return key;
}
static u8 * eap_eke_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
{
struct eap_eke_data *data = priv;
u8 *key;
if (data->state != SUCCESS)
return NULL;
key = os_malloc(EAP_EMSK_LEN);
if (key == NULL)
return NULL;
os_memcpy(key, data->emsk, EAP_EMSK_LEN);
*len = EAP_EMSK_LEN;
return key;
}
int eap_peer_eke_register(void)
{
struct eap_method *eap;
int ret;
eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
EAP_VENDOR_IETF, EAP_TYPE_EKE, "EKE");
if (eap == NULL)
return -1;
eap->init = eap_eke_init;
eap->deinit = eap_eke_deinit;
eap->process = eap_eke_process;
eap->isKeyAvailable = eap_eke_isKeyAvailable;
eap->getKey = eap_eke_getKey;
eap->get_emsk = eap_eke_get_emsk;
ret = eap_peer_method_register(eap);
if (ret)
eap_peer_method_free(eap);
return ret;
}

View file

@ -105,5 +105,6 @@ int eap_peer_ikev2_register(void);
int eap_peer_vendor_test_register(void);
int eap_peer_tnc_register(void);
int eap_peer_pwd_register(void);
int eap_peer_eke_register(void);
#endif /* EAP_METHODS_H */

View file

@ -574,6 +574,22 @@ CONFIG_IEEE8021X_EAPOL=y
NEED_SHA256=y
endif
ifdef CONFIG_EAP_EKE
# EAP-EKE
ifeq ($(CONFIG_EAP_EKE), dyn)
L_CFLAGS += -DEAP_EKE_DYNAMIC
EAPDYN += src/eap_peer/eap_eke.so
else
L_CFLAGS += -DEAP_EKE
OBJS += src/eap_peer/eap_eke.c src/eap_common/eap_eke_common.c
OBJS_h += src/eap_server/eap_server_eke.c
endif
CONFIG_IEEE8021X_EAPOL=y
NEED_DH_GROUPS=y
NEED_DH_GROUPS_ALL=y
NEED_SHA256=y
endif
ifdef CONFIG_WPS
ifdef CONFIG_WPS2
L_CFLAGS += -DCONFIG_WPS2

View file

@ -575,6 +575,22 @@ CONFIG_IEEE8021X_EAPOL=y
NEED_SHA256=y
endif
ifdef CONFIG_EAP_EKE
# EAP-EKE
ifeq ($(CONFIG_EAP_EKE), dyn)
CFLAGS += -DEAP_EKE_DYNAMIC
EAPDYN += ../src/eap_peer/eap_eke.so
else
CFLAGS += -DEAP_EKE
OBJS += ../src/eap_peer/eap_eke.o ../src/eap_common/eap_eke_common.o
OBJS_h += ../src/eap_server/eap_server_eke.o
endif
CONFIG_IEEE8021X_EAPOL=y
NEED_DH_GROUPS=y
NEED_DH_GROUPS_ALL=y
NEED_SHA256=y
endif
ifdef CONFIG_WPS
ifdef CONFIG_WPS2
CFLAGS += -DCONFIG_WPS2
@ -1577,6 +1593,10 @@ eap_ikev2.so: ../src/eap_peer/eap_ikev2.c ../src/eap_peer/ikev2.c ../src/eap_com
$(CC) $(LDFLAGS) -o $@ $(CFLAGS) -shared -rdynamic -fPIC $^ \
-Deap_peer_ikev2_register=eap_peer_method_dynamic_init
eap_eke.so: ../src/eap_peer/eap_eke.c ../src/eap_common/eap_eke_common.c
$(CC) $(LDFLAGS) -o $@ $(CFLAGS) -shared -rdynamic -fPIC $^ \
-Deap_peer_eke_register=eap_peer_method_dynamic_init
%.so: %.c
$(CC) $(LDFLAGS) -o $@ $(CFLAGS) -shared -rdynamic -fPIC $< \
-D$(*F:eap_%=eap_peer_%)_register=eap_peer_method_dynamic_init

View file

@ -210,6 +210,9 @@ CONFIG_EAP_LEAP=y
# EAP-IKEv2
#CONFIG_EAP_IKEV2=y
# EAP-EKE
#CONFIG_EAP_EKE=y
# PKCS#12 (PFX) support (used to read private key and certificate file from
# a file that usually has extension .p12 or .pfx)
CONFIG_PKCS12=y

View file

@ -135,6 +135,11 @@ int eap_register_methods(void)
ret = eap_peer_pwd_register();
#endif /* EAP_PWD */
#ifdef EAP_EKE
if (ret == 0)
ret = eap_peer_eke_register();
#endif /* EAP_EKE */
#ifdef EAP_SERVER_IDENTITY
if (ret == 0)
ret = eap_server_identity_register();