Add server identity configuration for EAP server

The new server_id parameter in hostapd.conf can now be used to specify
which identity is delivered to the EAP peer with EAP methods that
support authenticated server identity.

Signed-hostap: Jouni Malinen <j@w1.fi>

hostapd/config_file.c

@@ -2634,6 +2634,9 @@ static int hostapd_config_fill(struct hostapd_config *conf,
 			bss->upc = os_strdup(pos);
 		} else if (os_strcmp(buf, "pbc_in_m1") == 0) {
 			bss->pbc_in_m1 = atoi(pos);
+		} else if (os_strcmp(buf, "server_id") == 0) {
+			os_free(bss->server_id);
+			bss->server_id = os_strdup(pos);
 #ifdef CONFIG_WPS_NFC
 		} else if (os_strcmp(buf, "wps_nfc_dev_pw_id") == 0) {
 			bss->wps_nfc_dev_pw_id = atoi(pos);

hostapd/hostapd.conf

@@ -666,6 +666,11 @@ eap_server=0
 # Passphrase for private key
 #private_key_passwd=secret passphrase
 
+# Server identity
+# EAP methods that provide mechanism for authenticated server identity delivery
+# use this value. If not set, "hostapd" is used as a default.
+#server_id=server.example.com
+
 # Enable CRL verification.
 # Note: hostapd does not yet support CRL downloading based on CDP. Thus, a
 # valid CRL signed by the CA is required to be included in the ca_cert file.

src/ap/ap_config.c

@@ -532,6 +532,8 @@ static void hostapd_config_free_bss(struct hostapd_bss_config *conf)
 	wpabuf_free(conf->vendor_elements);
 
 	os_free(conf->sae_groups);
+
+	os_free(conf->server_id);
 }
 
 

src/ap/ap_config.h

@@ -375,6 +375,7 @@ struct hostapd_bss_config {
 	struct wpabuf *wps_nfc_dev_pw;
 #endif /* CONFIG_WPS */
 	int pbc_in_m1;
+	char *server_id;
 
 #define P2P_ENABLED BIT(0)
 #define P2P_GROUP_OWNER BIT(1)

src/ap/authsrv.c

@@ -111,6 +111,7 @@ static int hostapd_setup_radius_srv(struct hostapd_data *hapd)
 	srv.eap_req_id_text = conf->eap_req_id_text;
 	srv.eap_req_id_text_len = conf->eap_req_id_text_len;
 	srv.pwd_group = conf->pwd_group;
+	srv.server_id = conf->server_id ? conf->server_id : "hostapd";
 #ifdef CONFIG_RADIUS_TEST
 	srv.dump_msk_file = conf->dump_msk_file;
 #endif /* CONFIG_RADIUS_TEST */

src/ap/ieee802_1x.c

@@ -1828,6 +1828,13 @@ int ieee802_1x_init(struct hostapd_data *hapd)
 	conf.fragment_size = hapd->conf->fragment_size;
 	conf.pwd_group = hapd->conf->pwd_group;
 	conf.pbc_in_m1 = hapd->conf->pbc_in_m1;
+	if (hapd->conf->server_id) {
+		conf.server_id = (const u8 *) hapd->conf->server_id;
+		conf.server_id_len = os_strlen(hapd->conf->server_id);
+	} else {
+		conf.server_id = (const u8 *) "hostapd";
+		conf.server_id_len = 7;
+	}
 
 	os_memset(&cb, 0, sizeof(cb));
 	cb.eapol_send = ieee802_1x_eapol_send;

src/eap_server/eap.h

@@ -104,6 +104,9 @@ struct eap_config {
 	int fragment_size;
 
 	int pbc_in_m1;
+
+	const u8 *server_id;
+	size_t server_id_len;
 };
 
 

src/eap_server/eap_i.h

@@ -188,6 +188,9 @@ struct eap_sm {
 	int fragment_size;
 
 	int pbc_in_m1;
+
+	const u8 *server_id;
+	size_t server_id_len;
 };
 
 int eap_user_get(struct eap_sm *sm, const u8 *identity, size_t identity_len,

src/eap_server/eap_server.c

@@ -1278,6 +1278,8 @@ struct eap_sm * eap_server_sm_init(void *eapol_ctx,
 	sm->fragment_size = conf->fragment_size;
 	sm->pwd_group = conf->pwd_group;
 	sm->pbc_in_m1 = conf->pbc_in_m1;
+	sm->server_id = conf->server_id;
+	sm->server_id_len = conf->server_id_len;
 
 	wpa_printf(MSG_DEBUG, "EAP: Server state machine created");
 

src/eapol_auth/eapol_auth_sm.c

@@ -830,6 +830,8 @@ eapol_auth_alloc(struct eapol_authenticator *eapol, const u8 *addr,
 	eap_conf.fragment_size = eapol->conf.fragment_size;
 	eap_conf.pwd_group = eapol->conf.pwd_group;
 	eap_conf.pbc_in_m1 = eapol->conf.pbc_in_m1;
+	eap_conf.server_id = eapol->conf.server_id;
+	eap_conf.server_id_len = eapol->conf.server_id_len;
 	sm->eap = eap_server_sm_init(sm, &eapol_cb, &eap_conf);
 	if (sm->eap == NULL) {
 		eapol_auth_free(sm);
@@ -1045,6 +1047,8 @@ static int eapol_auth_conf_clone(struct eapol_auth_config *dst,
 	os_free(dst->eap_req_id_text);
 	dst->pwd_group = src->pwd_group;
 	dst->pbc_in_m1 = src->pbc_in_m1;
+	dst->server_id = src->server_id;
+	dst->server_id_len = src->server_id_len;
 	if (src->eap_req_id_text) {
 		dst->eap_req_id_text = os_malloc(src->eap_req_id_text_len);
 		if (dst->eap_req_id_text == NULL)

src/eapol_auth/eapol_auth_sm.h

@@ -37,6 +37,8 @@ struct eapol_auth_config {
 	int fragment_size;
 	u16 pwd_group;
 	int pbc_in_m1;
+	const u8 *server_id;
+	size_t server_id_len;
 
 	/* Opaque context pointer to owner data for callback functions */
 	void *ctx;

src/radius/radius_server.c

@@ -222,6 +222,11 @@ struct radius_server_data {
 	 */
 	u16 pwd_group;
 
+	/**
+	 * server_id - Server identity
+	 */
+	const char *server_id;
+
 	/**
 	 * wps - Wi-Fi Protected Setup context
 	 *
@@ -511,6 +516,8 @@ radius_server_get_new_session(struct radius_server_data *data,
 	eap_conf.tnc = data->tnc;
 	eap_conf.wps = data->wps;
 	eap_conf.pwd_group = data->pwd_group;
+	eap_conf.server_id = (const u8 *) data->server_id;
+	eap_conf.server_id_len = os_strlen(data->server_id);
 	sess->eap = eap_server_sm_init(sess, &radius_server_eapol_cb,
 				       &eap_conf);
 	if (sess->eap == NULL) {
@@ -1280,6 +1287,7 @@ radius_server_init(struct radius_server_conf *conf)
 	data->tnc = conf->tnc;
 	data->wps = conf->wps;
 	data->pwd_group = conf->pwd_group;
+	data->server_id = conf->server_id;
 	if (conf->eap_req_id_text) {
 		data->eap_req_id_text = os_malloc(conf->eap_req_id_text_len);
 		if (data->eap_req_id_text) {

src/radius/radius_server.h

@@ -143,6 +143,11 @@ struct radius_server_conf {
 	 */
 	u16 pwd_group;
 
+	/**
+	 * server_id - Server identity
+	 */
+	const char *server_id;
+
 	/**
 	 * wps - Wi-Fi Protected Setup context
 	 *