macsec: Support IEEE 802.1X(EAP)/PSK MACsec Key Agreement in hostapd
Signed-off-by: leiwei <leiwei@codeaurora.org>
This commit is contained in:
leiwei
Jouni Malinen
parent
a872bfcf31
commit
a93b369c17
7 changed files with 605 additions and 0 deletions
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@ -620,6 +620,15 @@ LIBS += -ldl
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endif
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endif
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ifdef CONFIG_MACSEC
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CFLAGS += -DCONFIG_MACSEC
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OBJS += ../src/ap/wpa_auth_kay.o
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OBJS += ../src/pae/ieee802_1x_cp.o
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OBJS += ../src/pae/ieee802_1x_kay.o
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OBJS += ../src/pae/ieee802_1x_key.o
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OBJS += ../src/pae/ieee802_1x_secy_ops.o
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endif
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# Basic EAP functionality is needed for EAPOL
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OBJS += eap_register.o
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OBJS += ../src/eap_server/eap_server.o
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@ -51,6 +51,7 @@
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#include "acs.h"
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#include "hs20.h"
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#include "airtime_policy.h"
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#include "wpa_auth_kay.h"
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static int hostapd_flush_old_stations(struct hostapd_data *hapd, u16 reason);
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@ -373,6 +374,7 @@ static void hostapd_free_hapd_data(struct hostapd_data *hapd)
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#endif /* CONFIG_NO_RADIUS */
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hostapd_deinit_wps(hapd);
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ieee802_1x_dealloc_kay_sm_hapd(hapd);
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#ifdef CONFIG_DPP
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hostapd_dpp_deinit(hapd);
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gas_query_ap_deinit(hapd->gas);
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@ -3047,6 +3049,14 @@ void hostapd_new_assoc_sta(struct hostapd_data *hapd, struct sta_info *sta,
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eloop_register_timeout(hapd->conf->ap_max_inactivity, 0,
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ap_handle_timer, hapd, sta);
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}
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#ifdef CONFIG_MACSEC
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if (hapd->conf->wpa_key_mgmt == WPA_KEY_MGMT_NONE &&
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hapd->conf->mka_psk_set)
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ieee802_1x_create_preshared_mka_hapd(hapd, sta);
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else
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ieee802_1x_alloc_kay_sm_hapd(hapd, sta);
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#endif /* CONFIG_MACSEC */
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}
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@ -232,6 +232,10 @@ struct hostapd_data {
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struct wps_stat wps_stats;
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#endif /* CONFIG_WPS */
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#ifdef CONFIG_MACSEC
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struct ieee802_1x_kay *kay;
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#endif /* CONFIG_MACSEC */
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struct hostapd_probereq_cb *probereq_cb;
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size_t num_probereq_cb;
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@ -34,6 +34,7 @@
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/* FIX: Not really a good thing to require ieee802_11.h here.. (FILS) */
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#include "ieee802_11.h"
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#include "ieee802_1x.h"
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#include "wpa_auth_kay.h"
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#ifdef CONFIG_HS20
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@ -2885,6 +2886,10 @@ static void ieee802_1x_finished(struct hostapd_data *hapd,
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}
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#endif /* CONFIG_HS20 */
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#ifdef CONFIG_MACSEC
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ieee802_1x_notify_create_actor_hapd(hapd, sta);
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#endif /* CONFIG_MACSEC */
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key = ieee802_1x_get_key(sta->eapol_sm, &len);
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if (sta->session_timeout_set) {
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os_get_reltime(&now);
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523
src/ap/wpa_auth_kay.c
Normal file
523
src/ap/wpa_auth_kay.c
Normal file
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@ -0,0 +1,523 @@
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/*
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* IEEE 802.1X-2010 KaY Interface
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* Copyright (c) 2019, The Linux Foundation
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*
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* This software may be distributed under the terms of the BSD license.
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* See README for more details.
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*/
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#include "utils/includes.h"
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#include "utils/common.h"
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#include "pae/ieee802_1x_key.h"
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#include "pae/ieee802_1x_kay.h"
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#include "hostapd.h"
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#include "sta_info.h"
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#include "wpa_auth_kay.h"
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#include "ieee802_1x.h"
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#define DEFAULT_KEY_LEN 16
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/* secure Connectivity Association Key Name (CKN) */
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#define DEFAULT_CKN_LEN 16
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static int hapd_macsec_init(void *priv, struct macsec_init_params *params)
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{
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struct hostapd_data *hapd = priv;
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if (!hapd->driver->macsec_init)
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return -1;
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return hapd->driver->macsec_init(hapd->drv_priv, params);
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}
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static int hapd_macsec_deinit(void *priv)
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{
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struct hostapd_data *hapd = priv;
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if (!hapd->driver->macsec_deinit)
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return -1;
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return hapd->driver->macsec_deinit(hapd->drv_priv);
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}
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static int hapd_macsec_get_capability(void *priv, enum macsec_cap *cap)
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{
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struct hostapd_data *hapd = priv;
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if (!hapd->driver->macsec_get_capability)
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return -1;
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return hapd->driver->macsec_get_capability(hapd->drv_priv, cap);
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}
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static int hapd_enable_protect_frames(void *priv, Boolean enabled)
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{
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struct hostapd_data *hapd = priv;
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if (!hapd->driver->enable_protect_frames)
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return -1;
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return hapd->driver->enable_protect_frames(hapd->drv_priv, enabled);
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}
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static int hapd_enable_encrypt(void *priv, Boolean enabled)
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{
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struct hostapd_data *hapd = priv;
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if (!hapd->driver->enable_encrypt)
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return -1;
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return hapd->driver->enable_encrypt(hapd->drv_priv, enabled);
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}
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static int hapd_set_replay_protect(void *priv, Boolean enabled, u32 window)
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{
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struct hostapd_data *hapd = priv;
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if (!hapd->driver->set_replay_protect)
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return -1;
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return hapd->driver->set_replay_protect(hapd->drv_priv, enabled,
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window);
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}
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static int hapd_set_current_cipher_suite(void *priv, u64 cs)
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{
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struct hostapd_data *hapd = priv;
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if (!hapd->driver->set_current_cipher_suite)
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return -1;
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return hapd->driver->set_current_cipher_suite(hapd->drv_priv, cs);
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}
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static int hapd_enable_controlled_port(void *priv, Boolean enabled)
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{
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struct hostapd_data *hapd = priv;
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if (!hapd->driver->enable_controlled_port)
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return -1;
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return hapd->driver->enable_controlled_port(hapd->drv_priv, enabled);
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}
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static int hapd_get_receive_lowest_pn(void *priv, struct receive_sa *sa)
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{
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struct hostapd_data *hapd = priv;
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if (!hapd->driver->get_receive_lowest_pn)
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return -1;
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return hapd->driver->get_receive_lowest_pn(hapd->drv_priv, sa);
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}
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static int hapd_get_transmit_next_pn(void *priv, struct transmit_sa *sa)
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{
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struct hostapd_data *hapd = priv;
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if (!hapd->driver->get_transmit_next_pn)
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return -1;
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return hapd->driver->get_transmit_next_pn(hapd->drv_priv, sa);
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}
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static int hapd_set_transmit_next_pn(void *priv, struct transmit_sa *sa)
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{
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struct hostapd_data *hapd = priv;
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if (!hapd->driver->set_transmit_next_pn)
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return -1;
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return hapd->driver->set_transmit_next_pn(hapd->drv_priv, sa);
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}
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static unsigned int conf_offset_val(enum confidentiality_offset co)
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{
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switch (co) {
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case CONFIDENTIALITY_OFFSET_30:
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return 30;
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break;
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case CONFIDENTIALITY_OFFSET_50:
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return 50;
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default:
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return 0;
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}
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}
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static int hapd_create_receive_sc(void *priv, struct receive_sc *sc,
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enum validate_frames vf,
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enum confidentiality_offset co)
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{
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struct hostapd_data *hapd = priv;
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if (!hapd->driver->create_receive_sc)
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return -1;
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return hapd->driver->create_receive_sc(hapd->drv_priv, sc,
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conf_offset_val(co), vf);
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}
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static int hapd_delete_receive_sc(void *priv, struct receive_sc *sc)
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{
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struct hostapd_data *hapd = priv;
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if (!hapd->driver->delete_receive_sc)
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return -1;
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return hapd->driver->delete_receive_sc(hapd->drv_priv, sc);
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}
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static int hapd_create_receive_sa(void *priv, struct receive_sa *sa)
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{
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struct hostapd_data *hapd = priv;
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if (!hapd->driver->create_receive_sa)
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return -1;
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return hapd->driver->create_receive_sa(hapd->drv_priv, sa);
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}
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static int hapd_delete_receive_sa(void *priv, struct receive_sa *sa)
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{
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struct hostapd_data *hapd = priv;
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if (!hapd->driver->delete_receive_sa)
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return -1;
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return hapd->driver->delete_receive_sa(hapd->drv_priv, sa);
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}
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static int hapd_enable_receive_sa(void *priv, struct receive_sa *sa)
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{
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struct hostapd_data *hapd = priv;
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if (!hapd->driver->enable_receive_sa)
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return -1;
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return hapd->driver->enable_receive_sa(hapd->drv_priv, sa);
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}
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static int hapd_disable_receive_sa(void *priv, struct receive_sa *sa)
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{
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struct hostapd_data *hapd = priv;
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if (!hapd->driver->disable_receive_sa)
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return -1;
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return hapd->driver->disable_receive_sa(hapd->drv_priv, sa);
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}
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static int
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hapd_create_transmit_sc(void *priv, struct transmit_sc *sc,
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enum confidentiality_offset co)
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{
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struct hostapd_data *hapd = priv;
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if (!hapd->driver->create_transmit_sc)
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return -1;
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return hapd->driver->create_transmit_sc(hapd->drv_priv, sc,
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conf_offset_val(co));
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}
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static int hapd_delete_transmit_sc(void *priv, struct transmit_sc *sc)
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{
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struct hostapd_data *hapd = priv;
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if (!hapd->driver->delete_transmit_sc)
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return -1;
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return hapd->driver->delete_transmit_sc(hapd->drv_priv, sc);
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}
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static int hapd_create_transmit_sa(void *priv, struct transmit_sa *sa)
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{
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struct hostapd_data *hapd = priv;
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if (!hapd->driver->create_transmit_sa)
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return -1;
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return hapd->driver->create_transmit_sa(hapd->drv_priv, sa);
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}
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static int hapd_delete_transmit_sa(void *priv, struct transmit_sa *sa)
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{
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struct hostapd_data *hapd = priv;
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if (!hapd->driver->delete_transmit_sa)
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return -1;
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return hapd->driver->delete_transmit_sa(hapd->drv_priv, sa);
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}
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static int hapd_enable_transmit_sa(void *priv, struct transmit_sa *sa)
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{
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struct hostapd_data *hapd = priv;
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if (!hapd->driver->enable_transmit_sa)
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return -1;
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return hapd->driver->enable_transmit_sa(hapd->drv_priv, sa);
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}
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static int hapd_disable_transmit_sa(void *priv, struct transmit_sa *sa)
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{
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struct hostapd_data *hapd = priv;
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if (!hapd->driver->disable_transmit_sa)
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return -1;
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return hapd->driver->disable_transmit_sa(hapd->drv_priv, sa);
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}
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int ieee802_1x_alloc_kay_sm_hapd(struct hostapd_data *hapd,
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struct sta_info *sta)
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{
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struct ieee802_1x_kay_ctx *kay_ctx;
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struct ieee802_1x_kay *res = NULL;
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enum macsec_policy policy;
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ieee802_1x_dealloc_kay_sm_hapd(hapd);
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if (!hapd->conf || hapd->conf->macsec_policy == 0)
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return 0;
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if (hapd->conf->macsec_policy == 1) {
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if (hapd->conf->macsec_integ_only == 1)
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policy = SHOULD_SECURE;
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else
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policy = SHOULD_ENCRYPT;
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} else {
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policy = DO_NOT_SECURE;
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}
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wpa_printf(MSG_DEBUG, "%s: if_name=%s", __func__, hapd->conf->iface);
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kay_ctx = os_zalloc(sizeof(*kay_ctx));
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if (!kay_ctx)
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return -1;
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kay_ctx->ctx = hapd;
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kay_ctx->macsec_init = hapd_macsec_init;
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kay_ctx->macsec_deinit = hapd_macsec_deinit;
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kay_ctx->macsec_get_capability = hapd_macsec_get_capability;
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kay_ctx->enable_protect_frames = hapd_enable_protect_frames;
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kay_ctx->enable_encrypt = hapd_enable_encrypt;
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kay_ctx->set_replay_protect = hapd_set_replay_protect;
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kay_ctx->set_current_cipher_suite = hapd_set_current_cipher_suite;
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kay_ctx->enable_controlled_port = hapd_enable_controlled_port;
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kay_ctx->get_receive_lowest_pn = hapd_get_receive_lowest_pn;
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kay_ctx->get_transmit_next_pn = hapd_get_transmit_next_pn;
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kay_ctx->set_transmit_next_pn = hapd_set_transmit_next_pn;
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kay_ctx->create_receive_sc = hapd_create_receive_sc;
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kay_ctx->delete_receive_sc = hapd_delete_receive_sc;
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kay_ctx->create_receive_sa = hapd_create_receive_sa;
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kay_ctx->delete_receive_sa = hapd_delete_receive_sa;
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kay_ctx->enable_receive_sa = hapd_enable_receive_sa;
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kay_ctx->disable_receive_sa = hapd_disable_receive_sa;
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kay_ctx->create_transmit_sc = hapd_create_transmit_sc;
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kay_ctx->delete_transmit_sc = hapd_delete_transmit_sc;
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kay_ctx->create_transmit_sa = hapd_create_transmit_sa;
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kay_ctx->delete_transmit_sa = hapd_delete_transmit_sa;
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kay_ctx->enable_transmit_sa = hapd_enable_transmit_sa;
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kay_ctx->disable_transmit_sa = hapd_disable_transmit_sa;
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res = ieee802_1x_kay_init(kay_ctx, policy,
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hapd->conf->macsec_replay_protect,
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hapd->conf->macsec_replay_window,
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hapd->conf->macsec_port,
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hapd->conf->mka_priority, hapd->conf->iface,
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hapd->own_addr);
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/* ieee802_1x_kay_init() frees kay_ctx on failure */
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if (!res)
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return -1;
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hapd->kay = res;
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return 0;
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}
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void ieee802_1x_dealloc_kay_sm_hapd(struct hostapd_data *hapd)
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{
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if (!hapd->kay)
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return;
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ieee802_1x_kay_deinit(hapd->kay);
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hapd->kay = NULL;
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}
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static int ieee802_1x_auth_get_session_id(struct hostapd_data *hapd,
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struct sta_info *sta, u8 *sid,
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size_t *len)
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{
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const u8 *session_id;
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size_t id_len, need_len;
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session_id = ieee802_1x_get_session_id(sta->eapol_sm, &id_len);
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if (!session_id) {
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wpa_printf(MSG_DEBUG,
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"MACsec: Failed to get SessionID from EAPOL state machines");
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return -1;
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}
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need_len = 1 + 2 * 32 /* random size */;
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if (need_len > id_len) {
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wpa_printf(MSG_DEBUG, "EAP Session-Id not long enough");
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return -1;
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}
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os_memcpy(sid, session_id, need_len);
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*len = need_len;
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return 0;
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}
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|
||||
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;
|
||||
}
|
||||
51
src/ap/wpa_auth_kay.h
Normal file
51
src/ap/wpa_auth_kay.h
Normal file
|
|
@ -0,0 +1,51 @@
|
|||
/*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
#ifndef WPA_AUTH_KAY_H
|
||||
#define WPA_AUTH_KAY_H
|
||||
|
||||
#ifdef CONFIG_MACSEC
|
||||
|
||||
int ieee802_1x_alloc_kay_sm_hapd(struct hostapd_data *hapd,
|
||||
struct sta_info *sta);
|
||||
void * ieee802_1x_notify_create_actor_hapd(struct hostapd_data *hapd,
|
||||
struct sta_info *sta);
|
||||
void ieee802_1x_dealloc_kay_sm_hapd(struct hostapd_data *hapd);
|
||||
|
||||
void * ieee802_1x_create_preshared_mka_hapd(struct hostapd_data *hapd,
|
||||
struct sta_info *sta);
|
||||
|
||||
#else /* CONFIG_MACSEC */
|
||||
|
||||
static inline int ieee802_1x_alloc_kay_sm_hapd(struct hostapd_data *hapd,
|
||||
struct sta_info *sta)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline void *
|
||||
ieee802_1x_notify_create_actor_hapd(struct hostapd_data *hapd,
|
||||
struct sta_info *sta)
|
||||
{
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static inline void ieee802_1x_dealloc_kay_sm_hapd(struct hostapd_data *hapd)
|
||||
{
|
||||
}
|
||||
|
||||
static inline void *
|
||||
ieee802_1x_create_preshared_mka_hapd(struct hostapd_data *hapd,
|
||||
struct sta_info *sta)
|
||||
{
|
||||
return NULL;
|
||||
}
|
||||
|
||||
#endif /* CONFIG_MACSEC */
|
||||
|
||||
#endif /* WPA_AUTH_KAY_H */
|
||||
|
|
@ -860,6 +860,9 @@ OBJS += ../src/pae/ieee802_1x_cp.o
|
|||
OBJS += ../src/pae/ieee802_1x_kay.o
|
||||
OBJS += ../src/pae/ieee802_1x_key.o
|
||||
OBJS += ../src/pae/ieee802_1x_secy_ops.o
|
||||
ifdef CONFIG_AP
|
||||
OBJS += ../src/ap/wpa_auth_kay.o
|
||||
endif
|
||||
endif
|
||||
|
||||
ifdef CONFIG_IEEE8021X_EAPOL
|
||||
|
|
|
|||
Loading…
Reference in a new issue