2 # Copyright 2017-2020 The OpenSSL Project Authors. All Rights Reserved.
4 # Licensed under the Apache License 2.0 (the "License"). You may not use
5 # this file except in compliance with the License. You can obtain a copy
6 # in the file LICENSE in the source distribution or at
7 # https://www.openssl.org/source/license.html
10 use OpenSSL
::Test qw
/:DEFAULT cmdstr srctop_file bldtop_dir/;
11 use OpenSSL
::Test
::Utils
;
14 my $test_name = "test_tls13downgrade";
17 plan skip_all
=> "TLSProxy isn't usable on $^O"
20 plan skip_all
=> "$test_name needs the dynamic engine feature enabled"
21 if disabled
("engine") || disabled
("dynamic-engine");
23 plan skip_all
=> "$test_name needs the sock feature enabled"
26 plan skip_all
=> "$test_name needs TLS1.3 and TLS1.2 enabled"
27 if disabled
("tls1_3") || disabled
("tls1_2");
29 $ENV{OPENSSL_ia32cap
} = '~0x200000200000000';
31 my $proxy = TLSProxy
::Proxy
->new(
33 cmdstr
(app
(["openssl"]), display
=> 1),
34 srctop_file
("apps", "server.pem"),
35 (!$ENV{HARNESS_ACTIVE
} || $ENV{HARNESS_VERBOSE
})
39 DOWNGRADE_TO_TLS_1_2
=> 0,
40 DOWNGRADE_TO_TLS_1_1
=> 1,
41 FALLBACK_FROM_TLS_1_3
=> 2,
44 #Test 1: Downgrade from TLSv1.3 to TLSv1.2
45 $proxy->filter(\
&downgrade_filter
);
46 my $testtype = DOWNGRADE_TO_TLS_1_2
;
47 $proxy->start() or plan skip_all
=> "Unable to start up Proxy for tests";
49 ok
(TLSProxy
::Message
->fail(), "Downgrade TLSv1.3 to TLSv1.2");
51 #Test 2: Downgrade from TLSv1.3 to TLSv1.1
53 $testtype = DOWNGRADE_TO_TLS_1_1
;
55 ok
(TLSProxy
::Message
->fail(), "Downgrade TLSv1.3 to TLSv1.1");
57 #Test 3: Downgrade from TLSv1.2 to TLSv1.1
59 $proxy->clientflags("-no_tls1_3");
60 $proxy->serverflags("-no_tls1_3");
62 ok
(TLSProxy
::Message
->fail(), "Downgrade TLSv1.2 to TLSv1.1");
64 #Test 4: Client falls back from TLSv1.3 (server does not support the fallback
67 $testtype = FALLBACK_FROM_TLS_1_3
;
68 $proxy->clientflags("-fallback_scsv -no_tls1_3");
70 my $alert = TLSProxy
::Message
->alert();
71 ok
(TLSProxy
::Message
->fail()
73 && $alert->description() == TLSProxy
::Message
::AL_DESC_ILLEGAL_PARAMETER
,
74 "Fallback from TLSv1.3");
77 skip
"TLSv1.1 disabled", 2 if disabled
("tls1_1");
78 #Test 5: A client side protocol "hole" should not be detected as a downgrade
80 $proxy->filter(undef);
81 $proxy->clientflags("-no_tls1_2");
82 $proxy->ciphers("AES128-SHA:\@SECLEVEL=0");
84 ok
(TLSProxy
::Message
->success(), "TLSv1.2 client-side protocol hole");
86 #Test 6: A server side protocol "hole" should not be detected as a downgrade
88 $proxy->filter(undef);
89 $proxy->serverflags("-no_tls1_2");
91 ok
(TLSProxy
::Message
->success(), "TLSv1.2 server-side protocol hole");
98 # We're only interested in the initial ClientHello
99 if ($proxy->flight != 0) {
103 my $message = ${$proxy->message_list}[0];
106 if ($testtype == FALLBACK_FROM_TLS_1_3
) {
107 #The default ciphersuite we use for TLSv1.2 without any SCSV
108 my @ciphersuites = (TLSProxy
::Message
::CIPHER_RSA_WITH_AES_128_CBC_SHA
);
109 $message->ciphersuite_len(2 * scalar @ciphersuites);
110 $message->ciphersuites(\
@ciphersuites);
112 if ($testtype == DOWNGRADE_TO_TLS_1_2
) {
122 $message->set_extension(TLSProxy
::Message
::EXT_SUPPORTED_VERSIONS
, $ext);