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- #! /usr/bin/env perl
- # Copyright 2017-2020 The OpenSSL Project Authors. All Rights Reserved.
- #
- # Licensed under the Apache License 2.0 (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 $test_name = "test_tls13downgrade";
- setup($test_name);
- plan skip_all => "TLSProxy isn't usable on $^O"
- if $^O =~ /^(VMS)$/;
- plan skip_all => "$test_name needs the dynamic engine feature enabled"
- if disabled("engine") || disabled("dynamic-engine");
- plan skip_all => "$test_name needs the sock feature enabled"
- if disabled("sock");
- plan skip_all => "$test_name needs TLS1.3 and TLS1.2 enabled"
- if disabled("tls1_3") || disabled("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})
- );
- use constant {
- DOWNGRADE_TO_TLS_1_2 => 0,
- DOWNGRADE_TO_TLS_1_1 => 1,
- FALLBACK_FROM_TLS_1_3 => 2,
- };
- #Test 1: Downgrade from TLSv1.3 to TLSv1.2
- $proxy->filter(\&downgrade_filter);
- my $testtype = DOWNGRADE_TO_TLS_1_2;
- $proxy->start() or plan skip_all => "Unable to start up Proxy for tests";
- plan tests => 6;
- ok(TLSProxy::Message->fail(), "Downgrade TLSv1.3 to TLSv1.2");
- #Test 2: Downgrade from TLSv1.3 to TLSv1.1
- $proxy->clear();
- $testtype = DOWNGRADE_TO_TLS_1_1;
- $proxy->start();
- ok(TLSProxy::Message->fail(), "Downgrade TLSv1.3 to TLSv1.1");
- #Test 3: Downgrade from TLSv1.2 to TLSv1.1
- $proxy->clear();
- $proxy->clientflags("-no_tls1_3");
- $proxy->serverflags("-no_tls1_3");
- $proxy->start();
- ok(TLSProxy::Message->fail(), "Downgrade TLSv1.2 to TLSv1.1");
- #Test 4: Client falls back from TLSv1.3 (server does not support the fallback
- # SCSV)
- $proxy->clear();
- $testtype = FALLBACK_FROM_TLS_1_3;
- $proxy->clientflags("-fallback_scsv -no_tls1_3");
- $proxy->start();
- my $alert = TLSProxy::Message->alert();
- ok(TLSProxy::Message->fail()
- && !$alert->server()
- && $alert->description() == TLSProxy::Message::AL_DESC_ILLEGAL_PARAMETER,
- "Fallback from TLSv1.3");
- SKIP: {
- skip "TLSv1.1 disabled", 2 if disabled("tls1_1");
- #Test 5: A client side protocol "hole" should not be detected as a downgrade
- $proxy->clear();
- $proxy->filter(undef);
- $proxy->clientflags("-no_tls1_2");
- $proxy->ciphers("AES128-SHA:\@SECLEVEL=0");
- $proxy->start();
- ok(TLSProxy::Message->success(), "TLSv1.2 client-side protocol hole");
- #Test 6: A server side protocol "hole" should not be detected as a downgrade
- $proxy->clear();
- $proxy->filter(undef);
- $proxy->serverflags("-no_tls1_2");
- $proxy->start();
- ok(TLSProxy::Message->success(), "TLSv1.2 server-side protocol hole");
- }
- sub downgrade_filter
- {
- my $proxy = shift;
- # We're only interested in the initial ClientHello
- if ($proxy->flight != 0) {
- return;
- }
- my $message = ${$proxy->message_list}[0];
- my $ext;
- if ($testtype == FALLBACK_FROM_TLS_1_3) {
- #The default ciphersuite we use for TLSv1.2 without any SCSV
- my @ciphersuites = (TLSProxy::Message::CIPHER_RSA_WITH_AES_128_CBC_SHA);
- $message->ciphersuite_len(2 * scalar @ciphersuites);
- $message->ciphersuites(\@ciphersuites);
- } else {
- if ($testtype == DOWNGRADE_TO_TLS_1_2) {
- $ext = pack "C3",
- 0x02, # Length
- 0x03, 0x03; #TLSv1.2
- } else {
- $ext = pack "C3",
- 0x02, # Length
- 0x03, 0x02; #TLSv1.1
- }
- $message->set_extension(TLSProxy::Message::EXT_SUPPORTED_VERSIONS, $ext);
- }
- $message->repack();
- }
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