Implemented hook to modify IKE header SPIs

2011-01-05 16:45:50 +01:00
parent 6b50b9115d
commit 19a18de98a
2 changed files with 105 additions and 1 deletions
@@ -8,7 +8,7 @@ conftest_SOURCES = conftest.c conftest.h config.c config.h actions.c actions.h \
 	hooks/add_payload.c hooks/set_critical.c hooks/force_cookie.c \
 	hooks/set_ike_version.c hooks/pretend_auth.c hooks/set_length.c \
 	hooks/log_proposals.c hooks/set_proposal_number.c hooks/log_ke.c \
-	hooks/log_id.c hooks/custom_proposal.c
+	hooks/log_id.c hooks/custom_proposal.c hooks/set_ike_spi.c

 INCLUDES = \
 	-I$(top_srcdir)/src/libstrongswan \
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2010 Martin Willi
+ * Copyright (C) 2010 revosec AG
+ *
+ * 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 "hook.h"
+
+#include <encoding/payloads/unknown_payload.h>
+
+typedef struct private_set_ike_spi_t private_set_ike_spi_t;
+
+/**
+ * Private data of an set_ike_spi_t object.
+ */
+struct private_set_ike_spi_t {
+
+	/**
+	 * Implements the hook_t interface.
+	 */
+	hook_t hook;
+
+	/**
+	 * Alter requests or responses?
+	 */
+	bool req;
+
+	/**
+	 * ID of message to alter.
+	 */
+	int id;
+
+	/**
+	 * Initiator SPI
+	 */
+	u_int64_t spii;
+
+	/**
+	 * Responder SPI
+	 */
+	u_int64_t spir;
+};
+
+METHOD(listener_t, message, bool,
+	private_set_ike_spi_t *this, ike_sa_t *ike_sa, message_t *message,
+	bool incoming)
+{
+	if (!incoming &&
+		message->get_request(message) == this->req &&
+		message->get_message_id(message) == this->id)
+	{
+		ike_sa_id_t *id;
+
+		DBG1(DBG_CFG, "setting IKE SPIs to: 0x%llx/0x%llx",
+			 this->spii, this->spir);
+
+		id = message->get_ike_sa_id(message);
+		id->set_initiator_spi(id, this->spii);
+		id->set_responder_spi(id, this->spir);
+	}
+	return TRUE;
+}
+
+METHOD(hook_t, destroy, void,
+	private_set_ike_spi_t *this)
+{
+	free(this);
+}
+
+/**
+ * Create the IKE_AUTH fill hook
+ */
+hook_t *set_ike_spi_hook_create(char *name)
+{
+	private_set_ike_spi_t *this;
+
+	INIT(this,
+		.hook = {
+			.listener = {
+				.message = _message,
+			},
+			.destroy = _destroy,
+		},
+		.req = conftest->test->get_bool(conftest->test,
+										"hooks.%s.request", TRUE, name),
+		.id = conftest->test->get_int(conftest->test,
+										"hooks.%s.id", 0, name),
+		.spii = strtoull(conftest->test->get_str(conftest->test,
+										"hooks.%s.spii", "0", name), NULL, 16),
+		.spir = strtoull(conftest->test->get_str(conftest->test,
+										"hooks.%s.spir", "0", name), NULL, 16),
+	);
+
+	return &this->hook;
+}