EAP-FAST server: Add I-ID into PAC-Info

This indicates that the peer identity is associated with the
credential and will be required to match with the identity used
during authentication when the PAC is used (RFC 5422, 4.2.4).

src/eap_server/eap_server_fast.c

@@ -791,6 +791,11 @@ static struct wpabuf * eap_fast_build_pac(struct eap_sm *sm,
 	
 	/* Note: headers may be misaligned after A-ID */
 
+	if (sm->identity) {
+		eap_fast_put_tlv(buf, PAC_TYPE_I_ID, sm->identity,
+				 sm->identity_len);
+	}
+
 	/* A-ID-Info (inside PAC-Info) */
 	eap_fast_put_tlv(buf, PAC_TYPE_A_ID_INFO, data->srv_id_info,
 			 srv_id_info_len);