Add a test for the supported_versions extension

Reviewed-by: NRich Salz <rsalz@openssl.org>

test/recipes/70-test_sslversions.t

+#! /usr/bin/env perl
+# Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
+#
+# Licensed under the OpenSSL license (the "License").  You may not use
+# this file except in compliance with the License.  You can obtain a copy
+# in the file LICENSE in the source distribution or at
+# https://www.openssl.org/source/license.html
+
+use strict;
+use OpenSSL::Test qw/:DEFAULT cmdstr srctop_file bldtop_dir/;
+use OpenSSL::Test::Utils;
+use TLSProxy::Proxy;
+use File::Temp qw(tempfile);
+
+use constant {
+    REVERSE_ORDER_VERSIONS => 1,
+    UNRECOGNISED_VERSIONS => 2,
+    NO_EXTENSION => 3,
+    EMPTY_EXTENSION => 4,
+    NO_TLS1_3 => 5
+};
+
+my $testtype;
+
+my $test_name = "test_sslversions";
+setup($test_name);
+
+plan skip_all => "TLSProxy isn't usable on $^O"
+    if $^O =~ /^(VMS|MSWin32)$/;
+
+plan skip_all => "$test_name needs the dynamic engine feature enabled"
+    if disabled("engine") || disabled("dynamic-engine");
+
+plan skip_all => "$test_name needs the sock feature enabled"
+    if disabled("sock");
+
+plan skip_all => "$test_name needs TLS1.3, TLS1.2 and TLS1.1 enabled"
+    if disabled("tls1_3") || disabled("tls1_2") || disabled("tls1_1");
+
+$ENV{OPENSSL_ia32cap} = '~0x200000200000000';
+
+my $proxy = TLSProxy::Proxy->new(
+    undef,
+    cmdstr(app(["openssl"]), display => 1),
+    srctop_file("apps", "server.pem"),
+    (!$ENV{HARNESS_ACTIVE} || $ENV{HARNESS_VERBOSE})
+);
+
+#We're just testing various negative and unusual scenarios here. ssltest with
+#02-protocol-version.conf should check all the various combinations of normal
+#version neg
+
+#Test 1: An empty supported_versions extension should not succeed
+$testtype = EMPTY_EXTENSION;
+$proxy->filter(\&modify_supported_versions_filter);
+$proxy->start() or plan skip_all => "Unable to start up Proxy for tests";
+plan tests => 6;
+ok(TLSProxy::Message->fail(), "Empty supported versions");
+
+#Test 2: supported_versions extension with no recognised versions should not
+#succeed
+$proxy->clear();
+$testtype = UNRECOGNISED_VERSIONS;
+$proxy->start();
+ok(TLSProxy::Message->fail(), "No recognised versions");
+
+#Test 3: No supported versions extensions should succeed and select TLSv1.2
+$proxy->clear();
+$testtype = NO_EXTENSION;
+$proxy->start();
+my $record = pop @{$proxy->record_list};
+ok(TLSProxy::Message->success()
+   && $record->version() == TLSProxy::Record::VERS_TLS_1_2,
+   "No supported versions extension");
+
+#Test 4: No supported versions extensions should fail if only TLS1.3 available
+$proxy->clear();
+$proxy->serverflags("-tls1_3");
+$proxy->start();
+ok(TLSProxy::Message->fail(), "No supported versions extension (only TLS1.3)");
+
+#Test 5: supported versions extension with best version last should succeed
+#and select TLSv1.3
+$proxy->clear();
+$testtype = REVERSE_ORDER_VERSIONS;
+$proxy->start();
+$record = pop @{$proxy->record_list};
+ok(TLSProxy::Message->success()
+   && $record->version() == TLSProxy::Record::VERS_TLS_1_3,
+   "Reverse order versions");
+
+#Test 6: no TLSv1.3 or TLSv1.2 version in supported versions extension, but
+#TLSv1.1 and TLSv1.0 are present. Should just use TLSv1.1 and succeed
+$proxy->clear();
+$testtype = NO_TLS1_3;
+$proxy->start();
+$record = pop @{$proxy->record_list};
+ok(TLSProxy::Message->success()
+   && $record->version() == TLSProxy::Record::VERS_TLS_1_1,
+   "No TLS1.3 in supported versions extension");
+
+sub modify_supported_versions_filter
+{
+    my $proxy = shift;
+
+    # We're only interested in the initial ClientHello
+    if ($proxy->flight != 0) {
+        return;
+    }
+
+    foreach my $message (@{$proxy->message_list}) {
+        if ($message->mt == TLSProxy::Message::MT_CLIENT_HELLO) {
+            my $ext;
+            if ($testtype == REVERSE_ORDER_VERSIONS) {
+                $ext = pack "C5",
+                    0x04, # Length
+                    0x03, 0x03, #TLSv1.2
+                    0x03, 0x04; #TLSv1.3
+            } elsif ($testtype == UNRECOGNISED_VERSIONS) {
+                $ext = pack "C5",
+                    0x04, # Length
+                    0x04, 0x04, #Some unrecognised version
+                    0x04, 0x03; #Another unrecognised version
+            } elsif ($testtype == NO_TLS1_3) {
+                $ext = pack "C5",
+                    0x04, # Length
+                    0x03, 0x02, #TLSv1.1
+                    0x03, 0x01; #TLSv1.0
+            }
+            if ($testtype == REVERSE_ORDER_VERSIONS
+                    || $testtype == UNRECOGNISED_VERSIONS
+                    || $testtype == NO_TLS1_3) {
+                $message->set_extension(
+                    TLSProxy::Message::EXT_SUPPORTED_VERSIONS, $ext);
+            } elsif ($testtype == EMPTY_EXTENSION) {
+                $message->set_extension(
+                    TLSProxy::Message::EXT_SUPPORTED_VERSIONS, "");
+            } else {
+                $message->delete_extension(
+                    TLSProxy::Message::EXT_SUPPORTED_VERSIONS);
+            }
+
+            $message->repack();
+        }
+    }
+}
+
+

util/TLSProxy/Message.pm

@@ -62,6 +62,7 @@ use constant {
     EXT_ENCRYPT_THEN_MAC => 22,
     EXT_EXTENDED_MASTER_SECRET => 23,
     EXT_SESSION_TICKET => 35,
+    EXT_SUPPORTED_VERSIONS => 43,
     # This extension does not exist and isn't recognised by OpenSSL.
     # We use it to test handling of duplicate extensions.
     EXT_DUPLICATE_EXTENSION => 1234