132 lines
4.1 KiB
Perl
132 lines
4.1 KiB
Perl
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#! /usr/bin/env perl
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# Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
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#
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# Licensed under the OpenSSL license (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 feature 'state';
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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 $test_name = "test_sslcbcpadding";
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setup($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 => "$test_name needs TLSv1.2 enabled"
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if disabled("tls1_2");
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$ENV{OPENSSL_ia32cap} = '~0x200000200000000';
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my $proxy = TLSProxy::Proxy->new(
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\&add_maximal_padding_filter,
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cmdstr(app(["openssl"]), display => 1),
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srctop_file("apps", "server.pem"),
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(!$ENV{HARNESS_ACTIVE} || $ENV{HARNESS_VERBOSE})
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);
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# TODO: We could test all 256 values, but then the log file gets too large for
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# CI. See https://github.com/openssl/openssl/issues/1440.
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my @test_offsets = (0, 128, 254, 255);
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# Test that maximally-padded records are accepted.
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my $bad_padding_offset = -1;
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$proxy->serverflags("-tls1_2");
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$proxy->serverconnects(1 + scalar(@test_offsets));
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$proxy->start() or plan skip_all => "Unable to start up Proxy for tests";
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plan tests => 1 + scalar(@test_offsets);
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ok(TLSProxy::Message->success(), "Maximally-padded record test");
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# Test that invalid padding is rejected.
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my $fatal_alert; # set by add_maximal_padding_filter on client's fatal alert
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foreach my $offset (@test_offsets) {
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$bad_padding_offset = $offset;
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$fatal_alert = 0;
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$proxy->clearClient();
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$proxy->clientstart();
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ok($fatal_alert, "Invalid padding byte $bad_padding_offset");
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}
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sub add_maximal_padding_filter
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{
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my $proxy = shift;
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my $messages = $proxy->message_list;
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state $sent_corrupted_payload;
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if ($proxy->flight == 0) {
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# Disable Encrypt-then-MAC.
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foreach my $message (@{$messages}) {
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if ($message->mt != TLSProxy::Message::MT_CLIENT_HELLO) {
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next;
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}
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$message->delete_extension(TLSProxy::Message::EXT_ENCRYPT_THEN_MAC);
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$message->process_extensions();
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$message->repack();
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}
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$sent_corrupted_payload = 0;
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return;
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}
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my $last_message = @{$messages}[-1];
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if (defined($last_message)
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&& $last_message->server
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&& $last_message->mt == TLSProxy::Message::MT_FINISHED
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&& !@{$last_message->records}[0]->{sent}) {
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# Insert a maximally-padded record. Assume a block size of 16 (AES) and
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# a MAC length of 20 (SHA-1).
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my $block_size = 16;
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my $mac_len = 20;
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# Size the plaintext so that 256 is a valid padding.
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my $plaintext_len = $block_size - ($mac_len % $block_size);
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my $plaintext = "A" x $plaintext_len;
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my $data = "B" x $block_size; # Explicit IV.
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$data .= $plaintext;
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$data .= TLSProxy::Proxy::fill_known_data($mac_len); # MAC.
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# Add padding.
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for (my $i = 0; $i < 256; $i++) {
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if ($i == $bad_padding_offset) {
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$sent_corrupted_payload = 1;
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$data .= "\xfe";
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} else {
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$data .= "\xff";
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}
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}
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my $record = TLSProxy::Record->new(
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$proxy->flight,
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TLSProxy::Record::RT_APPLICATION_DATA,
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TLSProxy::Record::VERS_TLS_1_2,
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length($data),
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0,
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length($data),
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$plaintext_len,
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$data,
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$plaintext,
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);
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# Send the record immediately after the server Finished.
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push @{$proxy->record_list}, $record;
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} elsif ($sent_corrupted_payload) {
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# Check for bad_record_mac from client
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my $last_record = @{$proxy->record_list}[-1];
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$fatal_alert = 1 if $last_record->is_fatal_alert(0) == 20;
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}
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}
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