fuzz: Add fuzzing boilerplate

fuzz/.gitignore

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+fuzz_certs

fuzz/Makefile.am

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+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/libstrongswan \
+	-DPLUGINDIR=\""$(abs_top_builddir)/src/libstrongswan/plugins\"" \
+	-DPLUGINS="\"${fuzz_plugins}\""
+
+noinst_PROGRAMS = fuzz_certs
+
+fuzz_certs_SOURCES = fuzz_certs.c
+
+fuzz_certs_LDFLAGS = libFuzzer.a -lstdc++
+
+fuzz_certs_LDADD = $(top_builddir)/src/libstrongswan/libstrongswan.la

fuzz/fuzz_certs.c

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+/*
+ * Copyright (C) 2017 Tobias Brunner
+ * HSR 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 <library.h>
+#include <utils/debug.h>
+
+int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len)
+{
+	certificate_t *cert;
+	chunk_t chunk;
+
+	dbg_default_set_level(-1);
+	library_init(NULL, "fuzz_certs");
+	plugin_loader_add_plugindirs(PLUGINDIR, PLUGINS);
+	if (!lib->plugins->load(lib->plugins, PLUGINS))
+	{
+		return 1;
+	}
+
+	chunk = chunk_create((u_char*)buf, len);
+	cert = lib->creds->create(lib->creds, CRED_CERTIFICATE, CERT_X509,
+							  BUILD_BLOB, chunk, BUILD_END);
+	DESTROY_IF(cert);
+
+	lib->plugins->unload(lib->plugins);
+	library_deinit();
+	return 0;
+}