#! /usr/bin/env perl
# Copyright 2017-2021 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
# 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 srctop_dir bldtop_dir/;
use OpenSSL::Test::Utils;
use File::Temp qw(tempfile);
use TLSProxy::Proxy;

my $test_name = "test_tls13psk";
setup($test_name);

plan skip_all => "TLSProxy isn't usable on $^O"
    if $^O =~ /^(VMS)$/;

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 TLSv1.3 enabled"
    if disabled("tls1_3") || (disabled("ec") && disabled("dh"));

my $proxy = TLSProxy::Proxy->new(
    undef,
    cmdstr(app(["openssl"]), display => 1),
    srctop_file("apps", "server.pem"),
    (!$ENV{HARNESS_ACTIVE} || $ENV{HARNESS_VERBOSE})
);

use constant {
    PSK_LAST_FIRST_CH => 0,
    ILLEGAL_EXT_SECOND_CH => 1
};

#Most PSK tests are done in test_ssl_new. This tests various failure scenarios
#around PSK

#Test 1: First get a session
(undef, my $session) = tempfile();
$proxy->clientflags("-sess_out ".$session);
$proxy->serverflags("-servername localhost");
$proxy->sessionfile($session);
$proxy->start() or plan skip_all => "Unable to start up Proxy for tests";
plan tests => 5;
ok(TLSProxy::Message->success(), "Initial connection");

#Test 2: Attempt a resume with PSK not in last place. Should fail
$proxy->clear();
$proxy->clientflags("-sess_in ".$session);
$proxy->filter(\&modify_psk_filter);
my $testtype = PSK_LAST_FIRST_CH;
$proxy->start();
ok(TLSProxy::Message->fail(), "PSK not last");

#Test 3: Attempt a resume after an HRR where PSK hash matches selected
#        ciphersuite. Should see PSK on second ClientHello
$proxy->clear();
$proxy->clientflags("-sess_in ".$session);
if (disabled("ec")) {
    $proxy->serverflags("-curves ffdhe3072");
} else {
    $proxy->serverflags("-curves P-256");
}
$proxy->filter(undef);
$proxy->start();
#Check if the PSK is present in the second ClientHello
my $ch2 = ${$proxy->message_list}[2];
my $ch2seen = defined $ch2 && $ch2->mt() == TLSProxy::Message::MT_CLIENT_HELLO;
my $pskseen = $ch2seen
              && defined ${$ch2->{extension_data}}{TLSProxy::Message::EXT_PSK};
ok($pskseen, "PSK hash matches");

#Test 4: Attempt a resume after an HRR where PSK hash does not match selected
#        ciphersuite. Should not see PSK on second ClientHello
$proxy->clear();
$proxy->clientflags("-sess_in ".$session);
$proxy->filter(\&modify_psk_filter);
if (disabled("ec")) {
    $proxy->serverflags("-curves ffdhe3072");
} else {
    $proxy->serverflags("-curves P-256");
}
$proxy->ciphersuitesc("TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384");
$proxy->ciphersuitess("TLS_AES_256_GCM_SHA384");
#We force an early failure because TLS Proxy doesn't actually support
#TLS_AES_256_GCM_SHA384. That doesn't matter for this test though.
$testtype = ILLEGAL_EXT_SECOND_CH;
$proxy->start();
#Check if the PSK is present in the second ClientHello
$ch2 = ${$proxy->message_list}[2];
$ch2seen = defined $ch2 && $ch2->mt() == TLSProxy::Message::MT_CLIENT_HELLO;
$pskseen = $ch2seen
           && defined ${$ch2->extension_data}{TLSProxy::Message::EXT_PSK};
ok($ch2seen && !$pskseen, "PSK hash does not match");

#Test 5: Attempt a resume without a sig agls extension. Should succeed because
#        sig algs is not needed in a resumption.
$proxy->clear();
$proxy->clientflags("-sess_in ".$session);
$proxy->filter(\&remove_sig_algs_filter);
$proxy->start();
ok(TLSProxy::Message->success(), "Remove sig algs");

unlink $session;

sub modify_psk_filter
{
    my $proxy = shift;
    my $flight;
    my $message;

    if ($testtype == PSK_LAST_FIRST_CH) {
        $flight = 0;
    } else {
        $flight = 2;
    }

    # Only look at the first or second ClientHello
    return if $proxy->flight != $flight;

    if ($testtype == PSK_LAST_FIRST_CH) {
        $message = ${$proxy->message_list}[0];
    } else {
        $message = ${$proxy->message_list}[2];
    }

    return if (!defined $message
               || $message->mt != TLSProxy::Message::MT_CLIENT_HELLO);

    if ($testtype == PSK_LAST_FIRST_CH) {
        $message->set_extension(TLSProxy::Message::EXT_FORCE_LAST, "");
    } else {
        #Deliberately break the connection
        $message->set_extension(TLSProxy::Message::EXT_SUPPORTED_GROUPS, "");
    }
    $message->repack();
}

sub remove_sig_algs_filter
{
    my $proxy = shift;
    my $message;

    # Only look at the first ClientHello
    return if $proxy->flight != 0;

    $message = ${$proxy->message_list}[0];
    $message->delete_extension(TLSProxy::Message::EXT_SIG_ALGS);
    $message->repack();
}