Added a fist hook to fill up IKE_AUTH messages with dummy certificates (1.1.1/1.2.1)

src/conftest/Makefile.am

@@ -2,8 +2,8 @@ ipsec_PROGRAMS = conftest
 
 AM_CFLAGS = -rdynamic
 
-conftest_SOURCES = conftest.c conftest.h config.c config.h hooks/hook.h \
-	actions.c actions.h
+conftest_SOURCES = conftest.c conftest.h config.c config.h actions.c actions.h \
+	hooks/hook.h hooks/ike_auth_fill.c
 
 INCLUDES = \
 	-I$(top_srcdir)/src/libstrongswan \

src/conftest/hooks/ike_auth_fill.c

@@ -0,0 +1,144 @@
+/*
+ * 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 <time.h>
+#include <netinet/udp.h>
+
+#include <encoding/payloads/cert_payload.h>
+#include <encoding/payloads/encryption_payload.h>
+
+typedef struct private_ike_auth_fill_t private_ike_auth_fill_t;
+
+/**
+ * Private data of an ike_auth_fill_t object.
+ */
+struct private_ike_auth_fill_t {
+
+	/**
+	 * Implements the hook_t interface.
+	 */
+	hook_t hook;
+
+	/**
+	 * Alter requests or responses?
+	 */
+	bool req;
+
+	/**
+	 * ID of message to alter.
+	 */
+	int id;
+
+	/**
+	 * Number of bytes to fill IKE_AUTH up
+	 */
+	int bytes;
+};
+
+/** size of non ESP-Marker */
+#define NON_ESP_MARKER_LEN 4
+
+/**
+ * Calculate packet size on wire (without ethernet/IP header)
+ */
+static size_t calculate_wire_size(message_t *message, ike_sa_t *ike_sa)
+{
+	enumerator_t *enumerator;
+	payload_t *payload;
+	size_t size = 0;
+
+	enumerator = message->create_payload_enumerator(message);
+	while (enumerator->enumerate(enumerator, &payload))
+	{
+		size += payload->get_length(payload);
+	}
+	enumerator->destroy(enumerator);
+
+	if (message->get_exchange_type(message) != IKE_SA_INIT)
+	{
+		keymat_t *keymat;
+		aead_t *aead;
+		size_t  bs;
+
+		keymat = ike_sa->get_keymat(ike_sa);
+		aead = keymat->get_aead(keymat, FALSE);
+		if (aead)
+		{
+			bs = aead->get_block_size(aead);
+			size += ENCRYPTION_PAYLOAD_HEADER_LENGTH + NON_ESP_MARKER_LEN +
+				aead->get_icv_size(aead) + aead->get_iv_size(aead) +
+				(bs - (size % bs));
+		}
+	}
+	return sizeof(struct udphdr) + IKE_HEADER_LENGTH + size;
+}
+
+METHOD(listener_t, message, bool,
+	private_ike_auth_fill_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)
+	{
+		cert_payload_t *pld;
+		size_t size, diff;
+		chunk_t data;
+
+		size = calculate_wire_size(message, ike_sa);
+		if (size < this->bytes - CERT_PAYLOAD_HEADER_LENGTH)
+		{
+			diff = this->bytes - size - CERT_PAYLOAD_HEADER_LENGTH;
+			data = chunk_alloc(diff);
+			memset(data.ptr, 0x12, data.len);
+			pld = cert_payload_create_custom(201, data);
+			message->add_payload(message, &pld->payload_interface);
+		}
+	}
+	return TRUE;
+}
+
+METHOD(hook_t, destroy, void,
+	private_ike_auth_fill_t *this)
+{
+	free(this);
+}
+
+/**
+ * Create the IKE_AUTH fill hook
+ */
+hook_t *ike_auth_fill_hook_create(void)
+{
+	private_ike_auth_fill_t *this;
+
+	INIT(this,
+		.hook = {
+			.listener = {
+				.message = _message,
+			},
+			.destroy = _destroy,
+		},
+		.req = conftest->test->get_bool(conftest->test,
+										"hooks.ike_auth_fill.request", TRUE),
+		.id = conftest->test->get_int(conftest->test,
+										"hooks.ike_auth_fill.id", 1),
+		.bytes = conftest->test->get_int(conftest->test,
+										"hooks.ike_auth_fill.bytes", 0),
+	);
+
+	return &this->hook;
+}