[svn-upgrade] Integrating new upstream version, strongswan (4.4.0)

1 files changed, 201 insertions, 0 deletions

diff --git a/src/libcharon/sa/authenticators/psk_authenticator.c b/src/libcharon/sa/authenticators/psk_authenticator.c
new file mode 100644
index 000000000..67197d690
--- /dev/null
+++ b/src/libcharon/sa/authenticators/psk_authenticator.c
@@ -0,0 +1,201 @@
+/*
+ * Copyright (C) 2005-2009 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 "psk_authenticator.h"
+
+#include <daemon.h>
+#include <encoding/payloads/auth_payload.h>
+
+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;
+
+	/**
+	 * nonce to include in AUTH calculation
+	 */
+	chunk_t nonce;
+
+	/**
+	 * IKE_SA_INIT message data to include in AUTH calculation
+	 */
+	chunk_t ike_sa_init;
+};
+
+/*
+ * Implementation of authenticator_t.build for builder
+ */
+static status_t build(private_psk_authenticator_t *this, message_t *message)
+{
+	identification_t *my_id, *other_id;
+	auth_payload_t *auth_payload;
+	shared_key_t *key;
+	chunk_t auth_data;
+	keymat_t *keymat;
+
+	keymat = this->ike_sa->get_keymat(this->ike_sa);
+	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 '%Y' (myself) with %N",
+		 my_id, auth_method_names, AUTH_PSK);
+	key = charon->credentials->get_shared(charon->credentials, SHARED_IKE,
+										  my_id, other_id);
+	if (key == NULL)
+	{
+		DBG1(DBG_IKE, "no shared key found for '%Y' - '%Y'", my_id, other_id);
+		return NOT_FOUND;
+	}
+	auth_data = keymat->get_psk_sig(keymat, FALSE, this->ike_sa_init,
+									this->nonce, key->get_key(key), my_id);
+	key->destroy(key);
+	DBG2(DBG_IKE, "successfully created shared key MAC");
+	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);
+	message->add_payload(message, (payload_t*)auth_payload);
+
+	return SUCCESS;
+}
+
+/**
+ * Implementation of authenticator_t.process for verifier
+ */
+static status_t process(private_psk_authenticator_t *this, message_t *message)
+{
+	chunk_t auth_data, recv_auth_data;
+	identification_t *my_id, *other_id;
+	auth_payload_t *auth_payload;
+	auth_cfg_t *auth;
+	shared_key_t *key;
+	enumerator_t *enumerator;
+	bool authenticated = FALSE;
+	int keys_found = 0;
+	keymat_t *keymat;
+
+	auth_payload = (auth_payload_t*)message->get_payload(message, AUTHENTICATION);
+	if (!auth_payload)
+	{
+		return FAILED;
+	}
+	keymat = this->ike_sa->get_keymat(this->ike_sa);
+	recv_auth_data = auth_payload->get_data(auth_payload);
+	my_id = this->ike_sa->get_my_id(this->ike_sa);
+	other_id = this->ike_sa->get_other_id(this->ike_sa);
+	enumerator = charon->credentials->create_shared_enumerator(
+							charon->credentials, SHARED_IKE, my_id, other_id);
+	while (!authenticated && enumerator->enumerate(enumerator, &key, NULL, NULL))
+	{
+		keys_found++;
+
+		auth_data = keymat->get_psk_sig(keymat, TRUE, this->ike_sa_init,
+									this->nonce, key->get_key(key), other_id);
+		if (auth_data.len && chunk_equals(auth_data, recv_auth_data))
+		{
+			DBG1(DBG_IKE, "authentication of '%Y' with %N successful",
+				 other_id, auth_method_names, AUTH_PSK);
+			authenticated = TRUE;
+		}
+		chunk_free(&auth_data);
+	}
+	enumerator->destroy(enumerator);
+
+	if (!authenticated)
+	{
+		if (keys_found == 0)
+		{
+			DBG1(DBG_IKE, "no shared key found for '%Y' - '%Y'", my_id, other_id);
+			return NOT_FOUND;
+		}
+		DBG1(DBG_IKE, "tried %d shared key%s for '%Y' - '%Y', but MAC mismatched",
+			 keys_found, keys_found == 1 ? "" : "s", my_id, other_id);
+		return FAILED;
+	}
+
+	auth = this->ike_sa->get_auth_cfg(this->ike_sa, FALSE);
+	auth->add(auth, AUTH_RULE_AUTH_CLASS, AUTH_CLASS_PSK);
+	return SUCCESS;
+}
+
+/**
+ * Implementation of authenticator_t.process for builder
+ * Implementation of authenticator_t.build for verifier
+ */
+static status_t return_failed()
+{
+	return FAILED;
+}
+
+/**
+ * Implementation of authenticator_t.destroy.
+ */
+static void destroy(private_psk_authenticator_t *this)
+{
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+psk_authenticator_t *psk_authenticator_create_builder(ike_sa_t *ike_sa,
+									chunk_t received_nonce, chunk_t sent_init)
+{
+	private_psk_authenticator_t *this = malloc_thing(private_psk_authenticator_t);
+
+	this->public.authenticator.build = (status_t(*)(authenticator_t*, message_t *message))build;
+	this->public.authenticator.process = (status_t(*)(authenticator_t*, message_t *message))return_failed;
+	this->public.authenticator.is_mutual = (bool(*)(authenticator_t*))return_false;
+	this->public.authenticator.destroy = (void(*)(authenticator_t*))destroy;
+
+	this->ike_sa = ike_sa;
+	this->ike_sa_init = sent_init;
+	this->nonce = received_nonce;
+
+	return &this->public;
+}
+
+/*
+ * Described in header.
+ */
+psk_authenticator_t *psk_authenticator_create_verifier(ike_sa_t *ike_sa,
+									chunk_t sent_nonce, chunk_t received_init)
+{
+	private_psk_authenticator_t *this = malloc_thing(private_psk_authenticator_t);
+
+	this->public.authenticator.build = (status_t(*)(authenticator_t*, message_t *messageh))return_failed;
+	this->public.authenticator.process = (status_t(*)(authenticator_t*, message_t *message))process;
+	this->public.authenticator.is_mutual = (bool(*)(authenticator_t*))return_false;
+	this->public.authenticator.destroy = (void(*)(authenticator_t*))destroy;
+
+	this->ike_sa = ike_sa;
+	this->ike_sa_init = received_init;
+	this->nonce = sent_nonce;
+
+	return &this->public;
+}
+