mirror of https://github.com/openssl/openssl
128 lines
3.8 KiB
Perl
128 lines
3.8 KiB
Perl
#! /usr/bin/env perl
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# Copyright 2017-2020 The OpenSSL Project Authors. All Rights Reserved.
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#
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# Licensed under the Apache License 2.0 (the "License"). You may not use
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# this file except in compliance with the License. You can obtain a copy
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# in the file LICENSE in the source distribution or at
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# https://www.openssl.org/source/license.html
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use strict;
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use OpenSSL::Test qw/:DEFAULT cmdstr srctop_file bldtop_dir/;
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use OpenSSL::Test::Utils;
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use TLSProxy::Proxy;
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my $test_name = "test_tls13downgrade";
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setup($test_name);
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plan skip_all => "TLSProxy isn't usable on $^O"
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if $^O =~ /^(VMS)$/;
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plan skip_all => "$test_name needs the dynamic engine feature enabled"
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if disabled("engine") || disabled("dynamic-engine");
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plan skip_all => "$test_name needs the sock feature enabled"
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if disabled("sock");
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plan skip_all => "$test_name needs TLS1.3 and TLS1.2 enabled"
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if disabled("tls1_3") || disabled("tls1_2");
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$ENV{OPENSSL_ia32cap} = '~0x200000200000000';
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my $proxy = TLSProxy::Proxy->new(
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undef,
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cmdstr(app(["openssl"]), display => 1),
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srctop_file("apps", "server.pem"),
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(!$ENV{HARNESS_ACTIVE} || $ENV{HARNESS_VERBOSE})
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);
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use constant {
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DOWNGRADE_TO_TLS_1_2 => 0,
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DOWNGRADE_TO_TLS_1_1 => 1,
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FALLBACK_FROM_TLS_1_3 => 2,
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};
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#Test 1: Downgrade from TLSv1.3 to TLSv1.2
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$proxy->filter(\&downgrade_filter);
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my $testtype = DOWNGRADE_TO_TLS_1_2;
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$proxy->start() or plan skip_all => "Unable to start up Proxy for tests";
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plan tests => 6;
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ok(TLSProxy::Message->fail(), "Downgrade TLSv1.3 to TLSv1.2");
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#Test 2: Downgrade from TLSv1.3 to TLSv1.1
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$proxy->clear();
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$testtype = DOWNGRADE_TO_TLS_1_1;
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$proxy->start();
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ok(TLSProxy::Message->fail(), "Downgrade TLSv1.3 to TLSv1.1");
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#Test 3: Downgrade from TLSv1.2 to TLSv1.1
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$proxy->clear();
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$proxy->clientflags("-no_tls1_3");
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$proxy->serverflags("-no_tls1_3");
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$proxy->start();
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ok(TLSProxy::Message->fail(), "Downgrade TLSv1.2 to TLSv1.1");
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#Test 4: Client falls back from TLSv1.3 (server does not support the fallback
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# SCSV)
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$proxy->clear();
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$testtype = FALLBACK_FROM_TLS_1_3;
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$proxy->clientflags("-fallback_scsv -no_tls1_3");
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$proxy->start();
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my $alert = TLSProxy::Message->alert();
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ok(TLSProxy::Message->fail()
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&& !$alert->server()
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&& $alert->description() == TLSProxy::Message::AL_DESC_ILLEGAL_PARAMETER,
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"Fallback from TLSv1.3");
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SKIP: {
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skip "TLSv1.1 disabled", 2 if disabled("tls1_1");
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#Test 5: A client side protocol "hole" should not be detected as a downgrade
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$proxy->clear();
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$proxy->filter(undef);
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$proxy->clientflags("-no_tls1_2");
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$proxy->ciphers("AES128-SHA:\@SECLEVEL=0");
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$proxy->start();
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ok(TLSProxy::Message->success(), "TLSv1.2 client-side protocol hole");
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#Test 6: A server side protocol "hole" should not be detected as a downgrade
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$proxy->clear();
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$proxy->filter(undef);
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$proxy->serverflags("-no_tls1_2");
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$proxy->start();
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ok(TLSProxy::Message->success(), "TLSv1.2 server-side protocol hole");
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}
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sub downgrade_filter
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{
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my $proxy = shift;
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# We're only interested in the initial ClientHello
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if ($proxy->flight != 0) {
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return;
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}
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my $message = ${$proxy->message_list}[0];
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my $ext;
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if ($testtype == FALLBACK_FROM_TLS_1_3) {
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#The default ciphersuite we use for TLSv1.2 without any SCSV
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my @ciphersuites = (TLSProxy::Message::CIPHER_RSA_WITH_AES_128_CBC_SHA);
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$message->ciphersuite_len(2 * scalar @ciphersuites);
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$message->ciphersuites(\@ciphersuites);
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} else {
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if ($testtype == DOWNGRADE_TO_TLS_1_2) {
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$ext = pack "C3",
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0x02, # Length
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0x03, 0x03; #TLSv1.2
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} else {
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$ext = pack "C3",
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0x02, # Length
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0x03, 0x02; #TLSv1.1
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}
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$message->set_extension(TLSProxy::Message::EXT_SUPPORTED_VERSIONS, $ext);
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}
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$message->repack();
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}
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