hostap/wpa_supplicant/wpas_kay.c

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/*
* IEEE 802.1X-2010 KaY Interface
* Copyright (c) 2013-2014, Qualcomm Atheros, Inc.
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include <openssl/ssl.h>
#include "utils/includes.h"
#include "utils/common.h"
#include "eap_peer/eap.h"
#include "eap_peer/eap_i.h"
#include "eapol_supp/eapol_supp_sm.h"
#include "pae/ieee802_1x_key.h"
#include "pae/ieee802_1x_kay.h"
#include "wpa_supplicant_i.h"
#include "config.h"
#include "config_ssid.h"
#include "driver_i.h"
#include "wpas_kay.h"
#define DEFAULT_KEY_LEN 16
/* secure Connectivity Association Key Name (CKN) */
#define DEFAULT_CKN_LEN 16
static int wpas_macsec_init(void *priv, struct macsec_init_params *params)
{
return wpa_drv_macsec_init(priv, params);
}
static int wpas_macsec_deinit(void *priv)
{
return wpa_drv_macsec_deinit(priv);
}
static int wpas_enable_protect_frames(void *wpa_s, Boolean enabled)
{
return wpa_drv_enable_protect_frames(wpa_s, enabled);
}
static int wpas_set_replay_protect(void *wpa_s, Boolean enabled, u32 window)
{
return wpa_drv_set_replay_protect(wpa_s, enabled, window);
}
static int wpas_set_current_cipher_suite(void *wpa_s, u64 cs)
{
return wpa_drv_set_current_cipher_suite(wpa_s, cs);
}
static int wpas_enable_controlled_port(void *wpa_s, Boolean enabled)
{
return wpa_drv_enable_controlled_port(wpa_s, enabled);
}
static int wpas_get_receive_lowest_pn(void *wpa_s, u32 channel,
u8 an, u32 *lowest_pn)
{
return wpa_drv_get_receive_lowest_pn(wpa_s, channel, an, lowest_pn);
}
static int wpas_get_transmit_next_pn(void *wpa_s, u32 channel,
u8 an, u32 *next_pn)
{
return wpa_drv_get_transmit_next_pn(wpa_s, channel, an, next_pn);
}
static int wpas_set_transmit_next_pn(void *wpa_s, u32 channel,
u8 an, u32 next_pn)
{
return wpa_drv_set_transmit_next_pn(wpa_s, channel, an, next_pn);
}
static int wpas_get_available_receive_sc(void *wpa_s, u32 *channel)
{
return wpa_drv_get_available_receive_sc(wpa_s, channel);
}
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 wpas_create_receive_sc(void *wpa_s, u32 channel,
struct ieee802_1x_mka_sci *sci,
enum validate_frames vf,
enum confidentiality_offset co)
{
return wpa_drv_create_receive_sc(wpa_s, channel, sci->addr,
be_to_host16(sci->port),
conf_offset_val(co), vf);
}
static int wpas_delete_receive_sc(void *wpa_s, u32 channel)
{
return wpa_drv_delete_receive_sc(wpa_s, channel);
}
static int wpas_create_receive_sa(void *wpa_s, u32 channel, u8 an,
u32 lowest_pn, const u8 *sak)
{
return wpa_drv_create_receive_sa(wpa_s, channel, an, lowest_pn, sak);
}
static int wpas_enable_receive_sa(void *wpa_s, u32 channel, u8 an)
{
return wpa_drv_enable_receive_sa(wpa_s, channel, an);
}
static int wpas_disable_receive_sa(void *wpa_s, u32 channel, u8 an)
{
return wpa_drv_disable_receive_sa(wpa_s, channel, an);
}
static int wpas_get_available_transmit_sc(void *wpa_s, u32 *channel)
{
return wpa_drv_get_available_transmit_sc(wpa_s, channel);
}
static int
wpas_create_transmit_sc(void *wpa_s, u32 channel,
const struct ieee802_1x_mka_sci *sci,
enum confidentiality_offset co)
{
return wpa_drv_create_transmit_sc(wpa_s, channel, sci->addr,
be_to_host16(sci->port),
conf_offset_val(co));
}
static int wpas_delete_transmit_sc(void *wpa_s, u32 channel)
{
return wpa_drv_delete_transmit_sc(wpa_s, channel);
}
static int wpas_create_transmit_sa(void *wpa_s, u32 channel, u8 an,
u32 next_pn, Boolean confidentiality,
const u8 *sak)
{
return wpa_drv_create_transmit_sa(wpa_s, channel, an, next_pn,
confidentiality, sak);
}
static int wpas_enable_transmit_sa(void *wpa_s, u32 channel, u8 an)
{
return wpa_drv_enable_transmit_sa(wpa_s, channel, an);
}
static int wpas_disable_transmit_sa(void *wpa_s, u32 channel, u8 an)
{
return wpa_drv_disable_transmit_sa(wpa_s, channel, an);
}
int ieee802_1x_alloc_kay_sm(struct wpa_supplicant *wpa_s, struct wpa_ssid *ssid)
{
struct ieee802_1x_kay_ctx *kay_ctx;
struct ieee802_1x_kay *res = NULL;
enum macsec_policy policy;
ieee802_1x_dealloc_kay_sm(wpa_s);
if (!ssid || ssid->macsec_policy == 0)
return 0;
policy = ssid->macsec_policy == 1 ? SHOULD_SECURE : DO_NOT_SECURE;
kay_ctx = os_zalloc(sizeof(*kay_ctx));
if (!kay_ctx)
return -1;
kay_ctx->ctx = wpa_s;
kay_ctx->macsec_init = wpas_macsec_init;
kay_ctx->macsec_deinit = wpas_macsec_deinit;
kay_ctx->enable_protect_frames = wpas_enable_protect_frames;
kay_ctx->set_replay_protect = wpas_set_replay_protect;
kay_ctx->set_current_cipher_suite = wpas_set_current_cipher_suite;
kay_ctx->enable_controlled_port = wpas_enable_controlled_port;
kay_ctx->get_receive_lowest_pn = wpas_get_receive_lowest_pn;
kay_ctx->get_transmit_next_pn = wpas_get_transmit_next_pn;
kay_ctx->set_transmit_next_pn = wpas_set_transmit_next_pn;
kay_ctx->get_available_receive_sc = wpas_get_available_receive_sc;
kay_ctx->create_receive_sc = wpas_create_receive_sc;
kay_ctx->delete_receive_sc = wpas_delete_receive_sc;
kay_ctx->create_receive_sa = wpas_create_receive_sa;
kay_ctx->enable_receive_sa = wpas_enable_receive_sa;
kay_ctx->disable_receive_sa = wpas_disable_receive_sa;
kay_ctx->get_available_transmit_sc = wpas_get_available_transmit_sc;
kay_ctx->create_transmit_sc = wpas_create_transmit_sc;
kay_ctx->delete_transmit_sc = wpas_delete_transmit_sc;
kay_ctx->create_transmit_sa = wpas_create_transmit_sa;
kay_ctx->enable_transmit_sa = wpas_enable_transmit_sa;
kay_ctx->disable_transmit_sa = wpas_disable_transmit_sa;
res = ieee802_1x_kay_init(kay_ctx, policy, wpa_s->ifname,
wpa_s->own_addr);
if (res == NULL) {
os_free(kay_ctx);
return -1;
}
wpa_s->kay = res;
return 0;
}
void ieee802_1x_dealloc_kay_sm(struct wpa_supplicant *wpa_s)
{
if (!wpa_s->kay)
return;
ieee802_1x_kay_deinit(wpa_s->kay);
wpa_s->kay = NULL;
}
static int ieee802_1x_auth_get_session_id(struct wpa_supplicant *wpa_s,
const u8 *addr, u8 *sid, size_t *len)
{
const u8 *session_id;
size_t id_len, need_len;
session_id = eapol_sm_get_session_id(wpa_s->eapol, &id_len);
if (session_id == NULL) {
wpa_printf(MSG_DEBUG,
"Failed to get SessionID from EAPOL state machines");
return -1;
}
need_len = 1 + 2 * SSL3_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 wpa_supplicant *wpa_s, const u8 *addr,
u8 *msk, size_t *len)
{
u8 key[EAP_MSK_LEN];
size_t keylen;
struct eapol_sm *sm;
int res;
sm = wpa_s->eapol;
if (sm == NULL)
return -1;
keylen = EAP_MSK_LEN;
res = eapol_sm_get_key(sm, key, keylen);
if (res) {
wpa_printf(MSG_DEBUG,
"Failed to get MSK from EAPOL state machines");
return -1;
}
if (keylen > *len)
keylen = *len;
os_memcpy(msk, key, keylen);
*len = keylen;
return 0;
}
void * ieee802_1x_notify_create_actor(struct wpa_supplicant *wpa_s,
const u8 *peer_addr)
{
u8 *sid;
size_t sid_len = 128;
struct mka_key_name *ckn;
struct mka_key *cak;
struct mka_key *msk;
void *res = NULL;
if (!wpa_s->kay || wpa_s->kay->policy == DO_NOT_SECURE)
return NULL;
wpa_printf(MSG_DEBUG,
"IEEE 802.1X: External notification - Create MKA for "
MACSTR, MAC2STR(peer_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(wpa_s, wpa_s->bssid, msk->key, &msk->len)) {
wpa_printf(MSG_ERROR, "IEEE 802.1X: Could not get MSK");
goto fail;
}
if (ieee802_1x_auth_get_session_id(wpa_s, wpa_s->bssid, sid, &sid_len))
{
wpa_printf(MSG_ERROR,
"IEEE 802.1X: Could not get EAP Session Id");
goto fail;
}
/* Derive CAK from MSK */
cak->len = DEFAULT_KEY_LEN;
if (ieee802_1x_cak_128bits_aes_cmac(msk->key, wpa_s->own_addr,
peer_addr, cak->key)) {
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_128bits_aes_cmac(msk->key, wpa_s->own_addr,
peer_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(wpa_s->kay, ckn, cak, 0,
EAP_EXCHANGE, FALSE);
fail:
if (msk) {
os_memset(msk, 0, sizeof(*msk));
os_free(msk);
}
os_free(sid);
os_free(ckn);
if (cak) {
os_memset(cak, 0, sizeof(*cak));
os_free(cak);
}
return res;
}