From 7638e378465433ecfc4333ef3033e59c77cb0006 Mon Sep 17 00:00:00 2001
From: Richard Levitte <levitte@openssl.org>
Date: Sun, 25 Dec 2016 17:56:52 +0100
Subject: [PATCH] 70-test_sslvertol.t: Make sure to check a max TLS version
 that matches configuration

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2144)
---
 test/recipes/70-test_sslvertol.t | 66 ++++++++++++++++++++++++++------
 1 file changed, 55 insertions(+), 11 deletions(-)

diff --git a/test/recipes/70-test_sslvertol.t b/test/recipes/70-test_sslvertol.t
index 108166f33e..272b825930 100755
--- a/test/recipes/70-test_sslvertol.t
+++ b/test/recipes/70-test_sslvertol.t
@@ -34,33 +34,64 @@ my $proxy = TLSProxy::Proxy->new(
     (!$ENV{HARNESS_ACTIVE} || $ENV{HARNESS_VERBOSE})
 );
 
+my @available_tls_versions = ();
+foreach (available_protocols("tls")) {
+    unless (disabled($_)) {
+        note("Checking enabled protocol $_");
+        m|^([a-z]+)(\d)(_\d)?|;
+        my $versionname;
+        if (defined $3) {
+            $versionname = 'TLSProxy::Record::VERS_'.uc($1).'_'.$2.$3;
+            note("'$1', '$2', '$3' => $versionname");
+        } else {
+            $versionname = 'TLSProxy::Record::VERS_'.uc($1).'_'.$2.'_0';
+            note("'$1', '$2' => $versionname");
+        }
+        push @available_tls_versions, eval $versionname;
+    }
+}
+note("TLS versions we can expect: ", join(", ", @available_tls_versions));
+
 #This file does tests without the supported_versions extension.
 #See 70-test_sslversions.t for tests with supported versions.
-#Test 1: Asking for TLS1.4 should pass and negotiate TLS1.2
+#Test 1: Asking for TLS1.4 should pass and negotiate the maximum
+#available TLS version according to configuration below TLS1.3
 my $client_version = TLSProxy::Record::VERS_TLS_1_4;
 $proxy->clientflags("-no_tls1_3");
 $proxy->start() or plan skip_all => "Unable to start up Proxy for tests";
 plan tests => 3;
 my $record = pop @{$proxy->record_list};
-ok(TLSProxy::Message->success()
-   && $record->version() == TLSProxy::Record::VERS_TLS_1_2,
-   "Version tolerance test, TLS 1.4");
+ok((note("Record version received: ".
+         (defined $record ? $record->version() : "none")),
+    TLSProxy::Message->success())
+   && $record->version() == tls_version_below(TLSProxy::Record::VERS_TLS_1_3),
+   "Version tolerance test, below TLS 1.4 and not TLS 1.3");
 
-#Test 2: Asking for TLS1.3 should succeed and negotiate TLS1.2
+#Test 2: Asking for TLS1.3 with that disabled should succeed and negotiate
+#the highest configured TLS version below that.
+$client_version = TLSProxy::Record::VERS_TLS_1_3;
 $proxy->clear();
 $proxy->clientflags("-no_tls1_3");
 $proxy->start();
 $record = pop @{$proxy->record_list};
-ok(TLSProxy::Message->success()
-   && $record->version() == TLSProxy::Record::VERS_TLS_1_2,
-   "Version tolerance test, TLS 1.3");
+ok((note("Record version received: ".
+         (defined $record ? $record->version() : "none")),
+    TLSProxy::Message->success())
+   && $record->version() == tls_version_below(TLSProxy::Record::VERS_TLS_1_3),
+   "Version tolerance test, max version but not TLS 1.3");
 
-#Test 3: Testing something below SSLv3 should fail
+#Test 3: Testing something below SSLv3 should fail.  We must disable TLS 1.3
+#to avoid having the 'supported_versions' extension kick in and override our
+#desires.
 $client_version = TLSProxy::Record::VERS_SSL_3_0 - 1;
 $proxy->clear();
 $proxy->clientflags("-no_tls1_3");
 $proxy->start();
-ok(TLSProxy::Message->fail(), "Version tolerance test, SSL < 3.0");
+$record = pop @{$proxy->record_list};
+ok((note("Record version received: ".
+         (defined $record ? $record->version() : "none")),
+    TLSProxy::Message->fail()),
+   "Version tolerance test, SSL < 3.0");
 
 sub vers_tolerance_filter
 {
@@ -74,10 +105,23 @@ sub vers_tolerance_filter
     foreach my $message (@{$proxy->message_list}) {
         if ($message->mt == TLSProxy::Message::MT_CLIENT_HELLO) {
             #Set the client version
-            #Anything above the max supported version (TLS1.2) should succeed
+            #Anything above the max supported version should succeed
             #Anything below SSLv3 should fail
             $message->client_version($client_version);
             $message->repack();
         }
     }
 }
+
+sub tls_version_below {
+    if (@_) {
+        my $term = shift;
+        my $res = undef;
+
+        foreach (@available_tls_versions) {
+            $res = $_ if $_ < $term;
+        }
+        return $res;
+    }
+    return $available_tls_versions[-1];
+}
-- 
2.34.1