fuzzer: Initial check in for improved fuzzing

Signed-off-by: Tim Rühsen <tim.ruehsen@gmx.de>

1 files changed, 150 insertions, 0 deletions

diff --git a/fuzz/gnutls_srp_server_fuzzer.c b/fuzz/gnutls_srp_server_fuzzer.c
new file mode 100644
index 0000000000..567b7d45c9
--- /dev/null
+++ b/fuzz/gnutls_srp_server_fuzzer.c
@@ -0,0 +1,150 @@
+/*
+ * Copyright (C) 2017 Nikos Mavrogiannopoulos
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#include <assert.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include <gnutls/gnutls.h>
+
+#include "certs.h"
+#include "srp.h"
+#include "mem.h"
+#include "fuzzer.h"
+
+static int
+srp_cb(gnutls_session_t session, const char *username,
+	gnutls_datum_t *salt, gnutls_datum_t *verifier, gnutls_datum_t *generator, gnutls_datum_t *prime)
+{
+	int ret;
+
+	salt->data = (unsigned char*)gnutls_malloc(SALT_SIZE);
+	memcpy(salt->data, (unsigned char*)SALT, SALT_SIZE);
+	salt->size = SALT_SIZE;
+
+	generator->data = (unsigned char*)gnutls_malloc(gnutls_srp_1024_group_generator.size);
+	memcpy(generator->data, gnutls_srp_1024_group_generator.data, gnutls_srp_1024_group_generator.size);
+	generator->size = gnutls_srp_1024_group_generator.size;
+
+	prime->data = (unsigned char*)gnutls_malloc(gnutls_srp_1024_group_prime.size);
+	memcpy(prime->data, gnutls_srp_1024_group_prime.data, gnutls_srp_1024_group_prime.size);
+	prime->size = gnutls_srp_1024_group_prime.size;
+
+	ret = gnutls_srp_verifier(USERNAME, PASSWORD, salt, generator, prime, verifier);
+	if (ret < 0)
+		return -1;
+
+	return 0;
+}
+
+int LLVMFuzzerTestOneInput(const uint8_t * data, size_t size)
+{
+	int res;
+	gnutls_datum_t rsa_cert, rsa_key;
+	gnutls_datum_t ecdsa_cert, ecdsa_key;
+	gnutls_datum_t ed25519_cert, ed25519_key;
+	gnutls_session_t session;
+	gnutls_certificate_credentials_t xcred;
+	gnutls_srp_server_credentials_t pcred;
+	struct mem_st memdata;
+
+	res = gnutls_init(&session, GNUTLS_SERVER);
+	assert(res >= 0);
+
+	res = gnutls_certificate_allocate_credentials(&xcred);
+	assert(res >= 0);
+
+	res = gnutls_srp_allocate_server_credentials(&pcred);
+	assert(res >= 0);
+
+	gnutls_srp_set_server_credentials_function(pcred, srp_cb);
+
+	rsa_cert.data = (unsigned char *)kRSACertificateDER;
+	rsa_cert.size = sizeof(kRSACertificateDER);
+	rsa_key.data = (unsigned char *)kRSAPrivateKeyDER;
+	rsa_key.size = sizeof(kRSAPrivateKeyDER);
+
+	ecdsa_cert.data = (unsigned char *)kECDSACertificateDER;
+	ecdsa_cert.size = sizeof(kECDSACertificateDER);
+	ecdsa_key.data = (unsigned char *)kECDSAPrivateKeyDER;
+	ecdsa_key.size = sizeof(kECDSAPrivateKeyDER);
+
+	ed25519_cert.data = (unsigned char *)kEd25519CertificateDER;
+	ed25519_cert.size = sizeof(kEd25519CertificateDER);
+	ed25519_key.data = (unsigned char *)kEd25519PrivateKeyDER;
+	ed25519_key.size = sizeof(kEd25519PrivateKeyDER);
+
+	res =
+		gnutls_certificate_set_x509_key_mem(xcred, &rsa_cert, &rsa_key,
+		GNUTLS_X509_FMT_DER);
+	assert(res >= 0);
+
+	res =
+		gnutls_certificate_set_x509_key_mem(xcred, &ecdsa_cert, &ecdsa_key,
+		GNUTLS_X509_FMT_DER);
+	assert(res >= 0);
+
+	res =
+		gnutls_certificate_set_x509_key_mem(xcred, &ed25519_cert, &ed25519_key,
+		GNUTLS_X509_FMT_DER);
+	assert(res >= 0);
+
+	gnutls_certificate_set_known_dh_params(xcred, GNUTLS_SEC_PARAM_MEDIUM);
+
+	res = gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, xcred);
+	assert(res >= 0);
+
+	res = gnutls_credentials_set(session, GNUTLS_CRD_SRP, pcred);
+	assert(res >= 0);
+
+	res = gnutls_priority_set_direct(session, "NORMAL:-KX-ALL:+SRP:+SRP-RSA:+SRP-DSS", NULL);
+	assert(res >= 0);
+
+	memdata.data = data;
+	memdata.size = size;
+
+	gnutls_transport_set_push_function(session, mem_push);
+	gnutls_transport_set_pull_function(session, mem_pull);
+	gnutls_transport_set_pull_timeout_function(session, mem_pull_timeout);
+	gnutls_transport_set_ptr(session, &memdata);
+
+	do {
+		res = gnutls_handshake(session);
+	} while (res < 0 && gnutls_error_is_fatal(res) == 0);
+	if (res >= 0) {
+		for (;;) {
+			char buf[16384];
+			res = gnutls_record_recv(session, buf, sizeof(buf));
+			if (res <= 0) {
+				break;
+			}
+		}
+	}
+
+	gnutls_deinit(session);
+	gnutls_certificate_free_credentials(xcred);
+	gnutls_srp_free_server_credentials(pcred);
+	return 0;
+}