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Diffstat (limited to 'test/recipes/70-test_tls13downgrade.t')
-rw-r--r--test/recipes/70-test_tls13downgrade.t156
1 files changed, 108 insertions, 48 deletions
diff --git a/test/recipes/70-test_tls13downgrade.t b/test/recipes/70-test_tls13downgrade.t
index 9e10a9c9c4ca..f40bd5f7036b 100644
--- a/test/recipes/70-test_tls13downgrade.t
+++ b/test/recipes/70-test_tls13downgrade.t
@@ -1,5 +1,5 @@
#! /usr/bin/env perl
-# Copyright 2017-2021 The OpenSSL Project Authors. All Rights Reserved.
+# Copyright 2017-2025 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
@@ -24,9 +24,8 @@ 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("ec") && disabled("dh"))
- || disabled("tls1_2");
+ if disabled("tls1_3") || disabled("tls1_2")
+ || (disabled("ec") && disabled("dh"));
$ENV{OPENSSL_ia32cap} = '~0x200000200000000';
@@ -41,89 +40,150 @@ use constant {
DOWNGRADE_TO_TLS_1_2 => 0,
DOWNGRADE_TO_TLS_1_1 => 1,
FALLBACK_FROM_TLS_1_3 => 2,
+ DOWNGRADE_TO_TLS_1_2_WITH_TLS_1_1_SIGNAL => 3,
+ DOWNGRADE_TO_TLS_1_1_WITH_TLS_1_2_SIGNAL => 4,
};
#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");
+plan tests => 8;
+ok(is_illegal_parameter_client_alert(), "Downgrade TLSv1.3 to TLSv1.2");
-#Test 2: Downgrade from TLSv1.3 to TLSv1.1
+#Test 2: Downgrade from TLSv1.3 to TLSv1.2 (server sends TLSv1.1 signal)
$proxy->clear();
-$testtype = DOWNGRADE_TO_TLS_1_1;
+$testtype = DOWNGRADE_TO_TLS_1_2_WITH_TLS_1_1_SIGNAL;
$proxy->start();
-ok(TLSProxy::Message->fail(), "Downgrade TLSv1.3 to TLSv1.1");
+ok(is_illegal_parameter_client_alert(),
+ "Downgrade from TLSv1.3 to TLSv1.2 (server sends TLSv1.1 signal)");
-#Test 3: Downgrade from TLSv1.2 to TLSv1.1
-$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
+#Test 3: 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");
+ok(is_illegal_parameter_client_alert(), "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
+ skip "TLSv1.1 disabled", 5 if disabled("tls1_1");
+
+ my $client_flags = "-min_protocol TLSv1.1 -cipher DEFAULT:\@SECLEVEL=0";
+ my $server_flags = "-min_protocol TLSv1.1";
+ my $ciphers = "AES128-SHA:\@SECLEVEL=0";
+
+ #Test 4: Downgrade from TLSv1.3 to TLSv1.1
+ $proxy->clear();
+ $testtype = DOWNGRADE_TO_TLS_1_1;
+ $proxy->clientflags($client_flags);
+ $proxy->serverflags($server_flags);
+ $proxy->ciphers($ciphers);
+ $proxy->start();
+ ok(is_illegal_parameter_client_alert(), "Downgrade TLSv1.3 to TLSv1.1");
+
+ #Test 5: Downgrade from TLSv1.3 to TLSv1.1 (server sends TLSv1.2 signal)
+ $proxy->clear();
+ $testtype = DOWNGRADE_TO_TLS_1_1_WITH_TLS_1_2_SIGNAL;
+ $proxy->clientflags($client_flags);
+ $proxy->serverflags($server_flags);
+ $proxy->ciphers($ciphers);
+ $proxy->start();
+ ok(is_illegal_parameter_client_alert(),
+ "Downgrade TLSv1.3 to TLSv1.1 (server sends TLSv1.2 signal)");
+
+ #Test 6: Downgrade from TLSv1.2 to TLSv1.1
+ $proxy->clear();
+ $testtype = DOWNGRADE_TO_TLS_1_1;
+ $proxy->clientflags($client_flags." -max_protocol TLSv1.2");
+ $proxy->serverflags($server_flags." -max_protocol TLSv1.2");
+ $proxy->ciphers($ciphers);
+ $proxy->start();
+ ok(is_illegal_parameter_client_alert(), "Downgrade TLSv1.2 to TLSv1.1");
+
+ #Test 7: 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");
+ $proxy->clientflags($client_flags." -no_tls1_2");
+ $proxy->serverflags($server_flags);
+ $proxy->ciphers($ciphers);
$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
+ #Test 8: A server side protocol "hole" should not be detected as a downgrade
$proxy->clear();
$proxy->filter(undef);
- $proxy->serverflags("-no_tls1_2");
+ $proxy->clientflags($client_flags);
+ $proxy->serverflags($server_flags." -no_tls1_2");
+ $proxy->ciphers($ciphers);
$proxy->start();
ok(TLSProxy::Message->success(), "TLSv1.2 server-side protocol hole");
}
+# Validate that the exchange fails with an illegal parameter alert from
+# the client
+sub is_illegal_parameter_client_alert
+{
+ return 0 unless TLSProxy::Message->fail();
+ my $alert = TLSProxy::Message->alert();
+ return 1 if !$alert->server()
+ && $alert->description()
+ == TLSProxy::Message::AL_DESC_ILLEGAL_PARAMETER;
+ return 0;
+}
+
sub downgrade_filter
{
my $proxy = shift;
- # We're only interested in the initial ClientHello
- if ($proxy->flight != 0) {
+ # We're only interested in the initial ClientHello and ServerHello
+ if ($proxy->flight > 1) {
return;
}
- my $message = ${$proxy->message_list}[0];
+ my $message = ${$proxy->message_list}[$proxy->flight];
- 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 {
- $ext = pack "C3",
- 0x02, # Length
- 0x03, 0x02; #TLSv1.1
+ # ServerHello
+ if ($proxy->flight == 1 && defined($message)) {
+ # Update the last byte of the downgrade signal
+ if ($testtype == DOWNGRADE_TO_TLS_1_2_WITH_TLS_1_1_SIGNAL) {
+ $message->random(substr($message->random, 0, 31) . "\0");
+ $message->repack();
+ } elsif ($testtype == DOWNGRADE_TO_TLS_1_1_WITH_TLS_1_2_SIGNAL) {
+ $message->random(substr($message->random, 0, 31) . "\1");
+ $message->repack();
}
- $message->set_extension(TLSProxy::Message::EXT_SUPPORTED_VERSIONS, $ext);
+ return;
}
- $message->repack();
+ # ClientHello
+ if ($proxy->flight == 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
+ || $testtype == DOWNGRADE_TO_TLS_1_2_WITH_TLS_1_1_SIGNAL) {
+ $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();
+ }
}
generated by cgit v1.3 (git 2.53.0) at 2026-07-25 07:49:10 +0000