Add some HRR tests

Check that we handle changes of ciphersuite between HRR and ServerHello
correctly.
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2895)

test/recipes/70-test_tls13hrr.t

+#! /usr/bin/env perl
+# Copyright 2017 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;
+
+my $test_name = "test_tls13hrr";
+setup($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 => "$test_name needs TLS1.3 enabled"
+    if disabled("tls1_3");
+
+$ENV{OPENSSL_ia32cap} = '~0x200000200000000';
+
+my $proxy = TLSProxy::Proxy->new(
+    undef,
+    cmdstr(app(["openssl"]), display => 1),
+    srctop_file("apps", "server.pem"),
+    (!$ENV{HARNESS_ACTIVE} || $ENV{HARNESS_VERBOSE})
+);
+
+use constant {
+    CHANGE_HRR_CIPHERSUITE => 0,
+    CHANGE_CH1_CIPHERSUITE => 1
+};
+
+#Test 1: A client should fail if the server changes the ciphersuite between the
+#        HRR and the SH
+$proxy->filter(\&hrr_filter);
+$proxy->serverflags("-curves P-256");
+my $testtype = CHANGE_HRR_CIPHERSUITE;
+$proxy->start() or plan skip_all => "Unable to start up Proxy for tests";
+plan tests => 2;
+ok(TLSProxy::Message->fail(), "Server ciphersuite changes");
+
+#Test 2: It is an error if the client changes the offered ciphersuites so that
+#        we end up selecting a different ciphersuite between HRR and the SH
+$proxy->clear();
+$proxy->serverflags("-curves P-256");
+$proxy->ciphers("TLS13-AES-128-GCM-SHA256:TLS13-AES-256-GCM-SHA384");
+$testtype = CHANGE_CH1_CIPHERSUITE;
+$proxy->start();
+ok(TLSProxy::Message->fail(), "Client ciphersuite changes");
+
+sub hrr_filter
+{
+    my $proxy = shift;
+
+    if ($testtype == CHANGE_HRR_CIPHERSUITE) {
+        # We're only interested in the HRR
+        if ($proxy->flight != 1) {
+            return;
+        }
+
+        my $hrr = ${$proxy->message_list}[1];
+
+        # We will normally only ever select CIPHER_TLS13_AES_128_GCM_SHA256
+        # because that's what Proxy tells s_server to do. Setting as below means
+        # the ciphersuite will change will we get the ServerHello
+        $hrr->ciphersuite(TLSProxy::Message::CIPHER_TLS13_AES_256_GCM_SHA384);
+        $hrr->repack();
+        return;
+    }
+
+    # CHANGE_CH1_CIPHERSUITE
+    if ($proxy->flight != 0) {
+        return;
+    }
+
+    my $ch1 = ${$proxy->message_list}[0];
+
+    # The server prefers TLS13-AES-256-GCM-SHA384 so it will pick that next
+    # time around
+    my @ciphersuites = (TLSProxy::Message::CIPHER_TLS13_AES_128_GCM_SHA256);
+    $ch1->ciphersuite_len(2 * scalar @ciphersuites);
+    $ch1->ciphersuites(\@ciphersuites);
+    $ch1->repack();
+}

util/TLSProxy/HelloRetryRequest.pm

@@ -81,6 +81,8 @@ sub parse
     $self->ciphersuite($ciphersuite);
     $self->extension_data(\%extensions);
 
+    print "    Server Version:".$server_version."\n";
+    print "    Ciphersuite:".$ciphersuite."\n";
     print "    Extensions Len:".$extensions_len."\n";
 }
 

util/TLSProxy/Message.pm

@@ -92,7 +92,9 @@ use constant {
 
 use constant {
     CIPHER_DHE_RSA_AES_128_SHA => 0x0033,
-    CIPHER_ADH_AES_128_SHA => 0x0034
+    CIPHER_ADH_AES_128_SHA => 0x0034,
+    CIPHER_TLS13_AES_128_GCM_SHA256 => 0x1301,
+    CIPHER_TLS13_AES_256_GCM_SHA384 => 0x1302
 };
 
 my $payload = "";