openssl/test/recipes/70-test_sslvertol.t

#!/usr/bin/perl
# Written by Matt Caswell for the OpenSSL project.
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use strict;
use OpenSSL::Test qw/:DEFAULT cmdstr srctop_file bldtop_dir/;
use OpenSSL::Test::Utils;
use TLSProxy::Proxy;

my $test_name = "test_sslextension";
setup($test_name);

plan skip_all => "TLSProxy isn't usable on $^O"
    if $^O =~ /^VMS$/;

plan skip_all => "$test_name needs the dynamic engine feature enabled"
    if disabled("engine") || disabled("dynamic_engines");

$ENV{OPENSSL_ENGINES} = bldtop_dir("engines");
$ENV{OPENSSL_ia32cap} = '~0x200000200000000';
my $proxy = TLSProxy::Proxy->new(
    \&vers_tolerance_filter,
    cmdstr(app(["openssl"])),
    srctop_file("apps", "server.pem"),
    (!$ENV{HARNESS_ACTIVE} || $ENV{HARNESS_VERBOSE})
);

plan tests => 2;

#Test 1: Asking for TLS1.3 should pass
my $client_version = TLSProxy::Record::VERS_TLS_1_3;
$proxy->start();
ok(TLSProxy::Message->success(), "Version tolerance test, TLS 1.3");

#Test 2: Testing something below SSLv3 should fail
$client_version = TLSProxy::Record::VERS_SSL_3_0 - 1;
$proxy->restart();
ok(TLSProxy::Message->fail(), "Version tolerance test, SSL < 3.0");

sub vers_tolerance_filter
{
    my $proxy = shift;

    # We're only interested in the initial ClientHello
    if ($proxy->flight != 0) {
        return;
    }

    foreach my $message (@{$proxy->message_list}) {
        if ($message->mt == TLSProxy::Message::MT_CLIENT_HELLO) {
            #Set the client version
            #Anything above the max supported version (TLS1.2) should succeed
            #Anything below SSLv3 should fail
            $message->client_version($client_version);
            $message->repack();
        }
    }
}