Add a renegotiation test

Make sure we did not break the unsafe legacy reneg checks with the extension
work.

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz
Reviewed-by: NRich Salz <rsalz@openssl.org>
Reviewed-by: NRichard Levitte <levitte@openssl.org>

test/recipes/70-test_renegotiation.t

+#! /usr/bin/env perl
+# Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
+#
+# Licensed under the OpenSSL license (the "License").  You may not use
+# this file except in compliance with the License.  You can obtain a copy
+# in the file LICENSE in the source distribution or at
+# https://www.openssl.org/source/license.html
+
+use strict;
+use OpenSSL::Test qw/:DEFAULT cmdstr srctop_file bldtop_dir/;
+use OpenSSL::Test::Utils;
+use TLSProxy::Proxy;
+
+my $test_name = "test_renegotiation";
+setup($test_name);
+
+plan skip_all => "TLSProxy isn't usable on $^O"
+    if $^O =~ /^(VMS|MSWin32)$/;
+
+plan skip_all => "$test_name needs the dynamic engine feature enabled"
+    if disabled("engine") || disabled("dynamic-engine");
+
+plan skip_all => "$test_name needs the sock feature enabled"
+    if disabled("sock");
+
+plan skip_all => "$test_name needs TLS <= 1.2 enabled"
+    if alldisabled(("ssl3", "tls1", "tls1_1", "tls1_2"));
+
+$ENV{OPENSSL_ia32cap} = '~0x200000200000000';
+my $proxy = TLSProxy::Proxy->new(
+    undef,
+    cmdstr(app(["openssl"]), display => 1),
+    srctop_file("apps", "server.pem"),
+    (!$ENV{HARNESS_ACTIVE} || $ENV{HARNESS_VERBOSE})
+);
+
+#Test 1: A basic renegotiation test
+$proxy->clientflags("-no_tls1_3");
+$proxy->reneg(1);
+$proxy->start() or plan skip_all => "Unable to start up Proxy for tests";
+plan tests => 2;
+ok(TLSProxy::Message->success(), "Basic renegotiation");
+
+#Test 2: Client does not send the Reneg SCSV. Reneg should fail
+$proxy->clear();
+$proxy->filter(\&reneg_filter);
+$proxy->clientflags("-no_tls1_3");
+$proxy->reneg(1);
+$proxy->start();
+ok(TLSProxy::Message->fail(), "No client SCSV");
+
+sub reneg_filter
+{
+    my $proxy = shift;
+
+    # We're only interested in the initial ClientHello message
+    if ($proxy->flight != 0) {
+        return;
+    }
+
+    foreach my $message (@{$proxy->message_list}) {
+        if ($message->mt == TLSProxy::Message::MT_CLIENT_HELLO) {
+            #Remove any SCSV ciphersuites - just leave AES128-SHA (0x002f)
+            my @ciphersuite = (0x002f);
+            $message->ciphersuites(\@ciphersuite);
+            $message->ciphersuite_len(2);
+            $message->repack();
+        }
+    }
+}