hostap/src/ap/wpa_auth_kay.c
leiwei a93b369c17 macsec: Support IEEE 802.1X(EAP)/PSK MACsec Key Agreement in hostapd
Signed-off-by: leiwei <leiwei@codeaurora.org>
2019-06-03 20:27:44 +03:00

523 lines
12 KiB
C

/*
* IEEE 802.1X-2010 KaY Interface
* Copyright (c) 2019, The Linux Foundation
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "utils/includes.h"
#include "utils/common.h"
#include "pae/ieee802_1x_key.h"
#include "pae/ieee802_1x_kay.h"
#include "hostapd.h"
#include "sta_info.h"
#include "wpa_auth_kay.h"
#include "ieee802_1x.h"
#define DEFAULT_KEY_LEN 16
/* secure Connectivity Association Key Name (CKN) */
#define DEFAULT_CKN_LEN 16
static int hapd_macsec_init(void *priv, struct macsec_init_params *params)
{
struct hostapd_data *hapd = priv;
if (!hapd->driver->macsec_init)
return -1;
return hapd->driver->macsec_init(hapd->drv_priv, params);
}
static int hapd_macsec_deinit(void *priv)
{
struct hostapd_data *hapd = priv;
if (!hapd->driver->macsec_deinit)
return -1;
return hapd->driver->macsec_deinit(hapd->drv_priv);
}
static int hapd_macsec_get_capability(void *priv, enum macsec_cap *cap)
{
struct hostapd_data *hapd = priv;
if (!hapd->driver->macsec_get_capability)
return -1;
return hapd->driver->macsec_get_capability(hapd->drv_priv, cap);
}
static int hapd_enable_protect_frames(void *priv, Boolean enabled)
{
struct hostapd_data *hapd = priv;
if (!hapd->driver->enable_protect_frames)
return -1;
return hapd->driver->enable_protect_frames(hapd->drv_priv, enabled);
}
static int hapd_enable_encrypt(void *priv, Boolean enabled)
{
struct hostapd_data *hapd = priv;
if (!hapd->driver->enable_encrypt)
return -1;
return hapd->driver->enable_encrypt(hapd->drv_priv, enabled);
}
static int hapd_set_replay_protect(void *priv, Boolean enabled, u32 window)
{
struct hostapd_data *hapd = priv;
if (!hapd->driver->set_replay_protect)
return -1;
return hapd->driver->set_replay_protect(hapd->drv_priv, enabled,
window);
}
static int hapd_set_current_cipher_suite(void *priv, u64 cs)
{
struct hostapd_data *hapd = priv;
if (!hapd->driver->set_current_cipher_suite)
return -1;
return hapd->driver->set_current_cipher_suite(hapd->drv_priv, cs);
}
static int hapd_enable_controlled_port(void *priv, Boolean enabled)
{
struct hostapd_data *hapd = priv;
if (!hapd->driver->enable_controlled_port)
return -1;
return hapd->driver->enable_controlled_port(hapd->drv_priv, enabled);
}
static int hapd_get_receive_lowest_pn(void *priv, struct receive_sa *sa)
{
struct hostapd_data *hapd = priv;
if (!hapd->driver->get_receive_lowest_pn)
return -1;
return hapd->driver->get_receive_lowest_pn(hapd->drv_priv, sa);
}
static int hapd_get_transmit_next_pn(void *priv, struct transmit_sa *sa)
{
struct hostapd_data *hapd = priv;
if (!hapd->driver->get_transmit_next_pn)
return -1;
return hapd->driver->get_transmit_next_pn(hapd->drv_priv, sa);
}
static int hapd_set_transmit_next_pn(void *priv, struct transmit_sa *sa)
{
struct hostapd_data *hapd = priv;
if (!hapd->driver->set_transmit_next_pn)
return -1;
return hapd->driver->set_transmit_next_pn(hapd->drv_priv, sa);
}
static unsigned int conf_offset_val(enum confidentiality_offset co)
{
switch (co) {
case CONFIDENTIALITY_OFFSET_30:
return 30;
break;
case CONFIDENTIALITY_OFFSET_50:
return 50;
default:
return 0;
}
}
static int hapd_create_receive_sc(void *priv, struct receive_sc *sc,
enum validate_frames vf,
enum confidentiality_offset co)
{
struct hostapd_data *hapd = priv;
if (!hapd->driver->create_receive_sc)
return -1;
return hapd->driver->create_receive_sc(hapd->drv_priv, sc,
conf_offset_val(co), vf);
}
static int hapd_delete_receive_sc(void *priv, struct receive_sc *sc)
{
struct hostapd_data *hapd = priv;
if (!hapd->driver->delete_receive_sc)
return -1;
return hapd->driver->delete_receive_sc(hapd->drv_priv, sc);
}
static int hapd_create_receive_sa(void *priv, struct receive_sa *sa)
{
struct hostapd_data *hapd = priv;
if (!hapd->driver->create_receive_sa)
return -1;
return hapd->driver->create_receive_sa(hapd->drv_priv, sa);
}
static int hapd_delete_receive_sa(void *priv, struct receive_sa *sa)
{
struct hostapd_data *hapd = priv;
if (!hapd->driver->delete_receive_sa)
return -1;
return hapd->driver->delete_receive_sa(hapd->drv_priv, sa);
}
static int hapd_enable_receive_sa(void *priv, struct receive_sa *sa)
{
struct hostapd_data *hapd = priv;
if (!hapd->driver->enable_receive_sa)
return -1;
return hapd->driver->enable_receive_sa(hapd->drv_priv, sa);
}
static int hapd_disable_receive_sa(void *priv, struct receive_sa *sa)
{
struct hostapd_data *hapd = priv;
if (!hapd->driver->disable_receive_sa)
return -1;
return hapd->driver->disable_receive_sa(hapd->drv_priv, sa);
}
static int
hapd_create_transmit_sc(void *priv, struct transmit_sc *sc,
enum confidentiality_offset co)
{
struct hostapd_data *hapd = priv;
if (!hapd->driver->create_transmit_sc)
return -1;
return hapd->driver->create_transmit_sc(hapd->drv_priv, sc,
conf_offset_val(co));
}
static int hapd_delete_transmit_sc(void *priv, struct transmit_sc *sc)
{
struct hostapd_data *hapd = priv;
if (!hapd->driver->delete_transmit_sc)
return -1;
return hapd->driver->delete_transmit_sc(hapd->drv_priv, sc);
}
static int hapd_create_transmit_sa(void *priv, struct transmit_sa *sa)
{
struct hostapd_data *hapd = priv;
if (!hapd->driver->create_transmit_sa)
return -1;
return hapd->driver->create_transmit_sa(hapd->drv_priv, sa);
}
static int hapd_delete_transmit_sa(void *priv, struct transmit_sa *sa)
{
struct hostapd_data *hapd = priv;
if (!hapd->driver->delete_transmit_sa)
return -1;
return hapd->driver->delete_transmit_sa(hapd->drv_priv, sa);
}
static int hapd_enable_transmit_sa(void *priv, struct transmit_sa *sa)
{
struct hostapd_data *hapd = priv;
if (!hapd->driver->enable_transmit_sa)
return -1;
return hapd->driver->enable_transmit_sa(hapd->drv_priv, sa);
}
static int hapd_disable_transmit_sa(void *priv, struct transmit_sa *sa)
{
struct hostapd_data *hapd = priv;
if (!hapd->driver->disable_transmit_sa)
return -1;
return hapd->driver->disable_transmit_sa(hapd->drv_priv, sa);
}
int ieee802_1x_alloc_kay_sm_hapd(struct hostapd_data *hapd,
struct sta_info *sta)
{
struct ieee802_1x_kay_ctx *kay_ctx;
struct ieee802_1x_kay *res = NULL;
enum macsec_policy policy;
ieee802_1x_dealloc_kay_sm_hapd(hapd);
if (!hapd->conf || hapd->conf->macsec_policy == 0)
return 0;
if (hapd->conf->macsec_policy == 1) {
if (hapd->conf->macsec_integ_only == 1)
policy = SHOULD_SECURE;
else
policy = SHOULD_ENCRYPT;
} else {
policy = DO_NOT_SECURE;
}
wpa_printf(MSG_DEBUG, "%s: if_name=%s", __func__, hapd->conf->iface);
kay_ctx = os_zalloc(sizeof(*kay_ctx));
if (!kay_ctx)
return -1;
kay_ctx->ctx = hapd;
kay_ctx->macsec_init = hapd_macsec_init;
kay_ctx->macsec_deinit = hapd_macsec_deinit;
kay_ctx->macsec_get_capability = hapd_macsec_get_capability;
kay_ctx->enable_protect_frames = hapd_enable_protect_frames;
kay_ctx->enable_encrypt = hapd_enable_encrypt;
kay_ctx->set_replay_protect = hapd_set_replay_protect;
kay_ctx->set_current_cipher_suite = hapd_set_current_cipher_suite;
kay_ctx->enable_controlled_port = hapd_enable_controlled_port;
kay_ctx->get_receive_lowest_pn = hapd_get_receive_lowest_pn;
kay_ctx->get_transmit_next_pn = hapd_get_transmit_next_pn;
kay_ctx->set_transmit_next_pn = hapd_set_transmit_next_pn;
kay_ctx->create_receive_sc = hapd_create_receive_sc;
kay_ctx->delete_receive_sc = hapd_delete_receive_sc;
kay_ctx->create_receive_sa = hapd_create_receive_sa;
kay_ctx->delete_receive_sa = hapd_delete_receive_sa;
kay_ctx->enable_receive_sa = hapd_enable_receive_sa;
kay_ctx->disable_receive_sa = hapd_disable_receive_sa;
kay_ctx->create_transmit_sc = hapd_create_transmit_sc;
kay_ctx->delete_transmit_sc = hapd_delete_transmit_sc;
kay_ctx->create_transmit_sa = hapd_create_transmit_sa;
kay_ctx->delete_transmit_sa = hapd_delete_transmit_sa;
kay_ctx->enable_transmit_sa = hapd_enable_transmit_sa;
kay_ctx->disable_transmit_sa = hapd_disable_transmit_sa;
res = ieee802_1x_kay_init(kay_ctx, policy,
hapd->conf->macsec_replay_protect,
hapd->conf->macsec_replay_window,
hapd->conf->macsec_port,
hapd->conf->mka_priority, hapd->conf->iface,
hapd->own_addr);
/* ieee802_1x_kay_init() frees kay_ctx on failure */
if (!res)
return -1;
hapd->kay = res;
return 0;
}
void ieee802_1x_dealloc_kay_sm_hapd(struct hostapd_data *hapd)
{
if (!hapd->kay)
return;
ieee802_1x_kay_deinit(hapd->kay);
hapd->kay = NULL;
}
static int ieee802_1x_auth_get_session_id(struct hostapd_data *hapd,
struct sta_info *sta, u8 *sid,
size_t *len)
{
const u8 *session_id;
size_t id_len, need_len;
session_id = ieee802_1x_get_session_id(sta->eapol_sm, &id_len);
if (!session_id) {
wpa_printf(MSG_DEBUG,
"MACsec: Failed to get SessionID from EAPOL state machines");
return -1;
}
need_len = 1 + 2 * 32 /* random size */;
if (need_len > id_len) {
wpa_printf(MSG_DEBUG, "EAP Session-Id not long enough");
return -1;
}
os_memcpy(sid, session_id, need_len);
*len = need_len;
return 0;
}
static int ieee802_1x_auth_get_msk(struct hostapd_data *hapd,
struct sta_info *sta, u8 *msk, size_t *len)
{
const u8 *key;
size_t keylen;
if (!sta->eapol_sm)
return -1;
key = ieee802_1x_get_key(sta->eapol_sm, &keylen);
if (key == NULL) {
wpa_printf(MSG_DEBUG,
"MACsec: Failed to get MSK from EAPOL state machines");
return -1;
}
wpa_printf(MSG_DEBUG, "MACsec: Successfully fetched key (len=%lu)",
(unsigned long) keylen);
wpa_hexdump_key(MSG_DEBUG, "MSK: ", key, keylen);
if (keylen > *len)
keylen = *len;
os_memcpy(msk, key, keylen);
*len = keylen;
return 0;
}
void * ieee802_1x_notify_create_actor_hapd(struct hostapd_data *hapd,
struct sta_info *sta)
{
u8 *sid;
size_t sid_len = 128;
struct mka_key_name *ckn;
struct mka_key *cak;
struct mka_key *msk;
void *res = NULL;
if (!hapd->kay || hapd->kay->policy == DO_NOT_SECURE)
return NULL;
wpa_printf(MSG_DEBUG,
"IEEE 802.1X: External notification - Create MKA for "
MACSTR, MAC2STR(sta->addr));
msk = os_zalloc(sizeof(*msk));
sid = os_zalloc(sid_len);
ckn = os_zalloc(sizeof(*ckn));
cak = os_zalloc(sizeof(*cak));
if (!msk || !sid || !ckn || !cak)
goto fail;
msk->len = DEFAULT_KEY_LEN;
if (ieee802_1x_auth_get_msk(hapd, sta, msk->key, &msk->len)) {
wpa_printf(MSG_ERROR, "IEEE 802.1X: Could not get MSK");
goto fail;
}
if (ieee802_1x_auth_get_session_id(hapd, sta, sid, &sid_len))
{
wpa_printf(MSG_ERROR,
"IEEE 802.1X: Could not get EAP Session Id");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "own_addr", hapd->own_addr, ETH_ALEN);
wpa_hexdump(MSG_DEBUG, "sta_addr", sta->addr, ETH_ALEN);
/* Derive CAK from MSK */
cak->len = DEFAULT_KEY_LEN;
if (ieee802_1x_cak_aes_cmac(msk->key, msk->len, hapd->own_addr,
sta->addr, cak->key, cak->len)) {
wpa_printf(MSG_ERROR, "IEEE 802.1X: Deriving CAK failed");
goto fail;
}
wpa_hexdump_key(MSG_DEBUG, "Derived CAK", cak->key, cak->len);
/* Derive CKN from MSK */
ckn->len = DEFAULT_CKN_LEN;
if (ieee802_1x_ckn_aes_cmac(msk->key, msk->len, hapd->own_addr,
sta->addr, sid, sid_len, ckn->name)) {
wpa_printf(MSG_ERROR, "IEEE 802.1X: Deriving CKN failed");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "Derived CKN", ckn->name, ckn->len);
res = ieee802_1x_kay_create_mka(hapd->kay, ckn, cak, 0, EAP_EXCHANGE,
TRUE);
fail:
bin_clear_free(msk, sizeof(*msk));
os_free(sid);
os_free(ckn);
bin_clear_free(cak, sizeof(*cak));
return res;
}
void * ieee802_1x_create_preshared_mka_hapd(struct hostapd_data *hapd,
struct sta_info *sta)
{
struct mka_key *cak;
struct mka_key_name *ckn;
void *res = NULL;
if ((hapd->conf->mka_psk_set & MKA_PSK_SET) != MKA_PSK_SET)
goto end;
ckn = os_zalloc(sizeof(*ckn));
if (!ckn)
goto end;
cak = os_zalloc(sizeof(*cak));
if (!cak)
goto free_ckn;
if (ieee802_1x_alloc_kay_sm_hapd(hapd, sta) < 0 || !hapd->kay)
goto free_cak;
if (hapd->kay->policy == DO_NOT_SECURE)
goto dealloc;
cak->len = hapd->conf->mka_cak_len;
os_memcpy(cak->key, hapd->conf->mka_cak, cak->len);
ckn->len = hapd->conf->mka_ckn_len;;
os_memcpy(ckn->name, hapd->conf->mka_ckn, ckn->len);
res = ieee802_1x_kay_create_mka(hapd->kay, ckn, cak, 0, PSK, TRUE);
if (res)
goto free_cak;
dealloc:
/* Failed to create MKA */
ieee802_1x_dealloc_kay_sm_hapd(hapd);
free_cak:
os_free(cak);
free_ckn:
os_free(ckn);
end:
return res;
}