moved typedefs to beginning of files to solve some include problems

splitted authenticator to have a separate implementation for each auth_method_t using va_copy to clone va_lists, should fix proplems on AMD64 some other cleanups
2006-10-30 14:07:05 +00:00
parent 09cb5472bc
commit 382b481795
119 changed files with 1196 additions and 1120 deletions
@@ -0,0 +1,193 @@
+/**
+ * @file authenticator.c
+ *
+ * @brief Implementation of authenticator_t.
+ *
+ */
+
+/*
+ * Copyright (C) 2005-2006 Martin Willi
+ * Copyright (C) 2005 Jan Hutter
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include <string.h>
+
+#include "psk_authenticator.h"
+
+#include <config/policies/policy.h>
+#include <daemon.h>
+
+/**
+ * Key pad for the AUTH method SHARED_KEY_MESSAGE_INTEGRITY_CODE.
+ */
+#define IKEV2_KEY_PAD "Key Pad for IKEv2"
+#define IKEV2_KEY_PAD_LENGTH 17
+
+
+typedef struct private_psk_authenticator_t private_psk_authenticator_t;
+
+/**
+ * Private data of an psk_authenticator_t object.
+ */
+struct private_psk_authenticator_t {
+
+	/**
+	 * Public authenticator_t interface.
+	 */
+	psk_authenticator_t public;
+
+	/**
+	 * Assigned IKE_SA
+	 */
+	ike_sa_t *ike_sa;
+};
+
+/**
+ * Function implemented in rsa_authenticator.c
+ */
+extern chunk_t build_tbs_octets(private_psk_authenticator_t *this, chunk_t ike_sa_init,
+								chunk_t nonce, identification_t *id, prf_t *prf);
+
+/**
+ * Creates the AUTH data using auth method SHARED_KEY_MESSAGE_INTEGRITY_CODE.
+ */
+static chunk_t build_shared_key_signature(private_psk_authenticator_t *this,
+										  chunk_t ike_sa_init,
+										  chunk_t nonce,
+										  chunk_t secret,
+										  identification_t *id,
+										  prf_t *prf)
+{
+	chunk_t key_pad, key, auth_data, octets;
+	
+	octets = build_tbs_octets(this, ike_sa_init, nonce, id, prf);
+	/* AUTH = prf(prf(Shared Secret,"Key Pad for IKEv2"), <msg octets>) */
+	key_pad.ptr = IKEV2_KEY_PAD;
+	key_pad.len = IKEV2_KEY_PAD_LENGTH;
+	prf->set_key(prf, secret);
+	prf->allocate_bytes(prf, key_pad, &key);
+	prf->set_key(prf, key);
+	prf->allocate_bytes(prf, octets, &auth_data);
+	DBG3(DBG_IKE, "octets = message + nonce + prf(Sk_px, IDx') %B", &octets);
+	DBG3(DBG_IKE, "secret %B", &secret);
+	DBG3(DBG_IKE, "keypad %B", &key_pad);
+	DBG3(DBG_IKE, "prf(secret, keypad) %B", &key);
+	DBG3(DBG_IKE, "AUTH = prf(prf(secret, keypad), octets) %B", &auth_data);
+	chunk_free(&octets);
+	chunk_free(&key);
+	
+	return auth_data;
+}
+
+/**
+ * Implementation of authenticator_t.verify.
+ */
+static status_t verify(private_psk_authenticator_t *this, chunk_t ike_sa_init,
+ 					   chunk_t my_nonce, auth_payload_t *auth_payload)
+{
+	status_t status;
+	chunk_t auth_data, recv_auth_data, shared_key;
+	identification_t *my_id, *other_id;
+	
+	my_id = this->ike_sa->get_my_id(this->ike_sa);
+	other_id = this->ike_sa->get_other_id(this->ike_sa);
+	status = charon->credentials->get_shared_key(charon->credentials, my_id,
+												 other_id, &shared_key);
+	if (status != SUCCESS)
+	{
+		DBG1(DBG_IKE, "no shared key found for '%D' - '%D'",  my_id, other_id);
+		return status;
+	}
+	
+	auth_data = build_shared_key_signature(this, ike_sa_init, my_nonce,
+										   shared_key, other_id,
+										   this->ike_sa->get_auth_verify(this->ike_sa));
+	chunk_free(&shared_key);
+	
+	recv_auth_data = auth_payload->get_data(auth_payload);
+	if (auth_data.len != recv_auth_data.len ||
+		!memeq(auth_data.ptr, recv_auth_data.ptr, auth_data.len))
+	{
+		DBG1(DBG_IKE, "PSK MAC verification failed");
+		chunk_free(&auth_data);
+		return FAILED;
+	}
+	chunk_free(&auth_data);
+	
+	DBG1(DBG_IKE, "authentication of '%D' with %N successful",
+		 other_id, auth_method_names, AUTH_PSK);
+	return SUCCESS;
+}
+
+/**
+ * Implementation of authenticator_t.build.
+ */
+static status_t build(private_psk_authenticator_t *this, chunk_t ike_sa_init,
+					  chunk_t other_nonce, auth_payload_t **auth_payload)
+{
+	chunk_t shared_key;
+	chunk_t auth_data;
+	status_t status;
+	identification_t *my_id, *other_id;
+	
+	my_id = this->ike_sa->get_my_id(this->ike_sa);
+	other_id = this->ike_sa->get_other_id(this->ike_sa);
+	DBG1(DBG_IKE, "authentication of '%D' (myself) with %N",
+		 my_id, auth_method_names, AUTH_PSK);
+	status = charon->credentials->get_shared_key(charon->credentials, my_id,
+												 other_id, &shared_key);
+	if (status != SUCCESS)
+	{
+		DBG1(DBG_IKE, "no shared key found for '%D' - '%D'", my_id, other_id);
+		return status;
+	}
+			
+	auth_data = build_shared_key_signature(this, ike_sa_init,
+										   other_nonce,  shared_key, my_id,
+										   this->ike_sa->get_auth_build(this->ike_sa));
+	DBG2(DBG_IKE, "successfully created shared key MAC");
+	chunk_free(&shared_key);
+	*auth_payload = auth_payload_create();
+	(*auth_payload)->set_auth_method(*auth_payload, AUTH_PSK);
+	(*auth_payload)->set_data(*auth_payload, auth_data);
+	
+	chunk_free(&auth_data);
+	return SUCCESS;
+}
+
+/**
+ * Implementation of authenticator_t.destroy.
+ */
+static void destroy(private_psk_authenticator_t *this)
+{
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+psk_authenticator_t *psk_authenticator_create(ike_sa_t *ike_sa)
+{
+	private_psk_authenticator_t *this = malloc_thing(private_psk_authenticator_t);
+	
+	/* public functions */
+	this->public.authenticator_interface.verify = (status_t(*)(authenticator_t*,chunk_t,chunk_t,auth_payload_t*))verify;
+	this->public.authenticator_interface.build = (status_t(*)(authenticator_t*,chunk_t,chunk_t,auth_payload_t**))build;
+	this->public.authenticator_interface.destroy = (void(*)(authenticator_t*))destroy;
+	
+	/* private data */
+	this->ike_sa = ike_sa;
+	
+	return &this->public;
+}