xref: /freebsd/crypto/openssl/test/recipes/70-test_sslsignature.t (revision 7fdf597e96a02165cfe22ff357b857d5fa15ed8a) 
1#! /usr/bin/env perl
2# Copyright 2016-2021 The OpenSSL Project Authors. All Rights Reserved.
3#
4# Licensed under the Apache License 2.0 (the "License").  You may not use
5# this file except in compliance with the License.  You can obtain a copy
6# in the file LICENSE in the source distribution or at
7# https://www.openssl.org/source/license.html
8
9use strict;
10use OpenSSL::Test qw/:DEFAULT cmdstr srctop_file bldtop_dir/;
11use OpenSSL::Test::Utils;
12use TLSProxy::Proxy;
13
14my $test_name = "test_sslsignature";
15setup($test_name);
16
17plan skip_all => "TLSProxy isn't usable on $^O"
18    if $^O =~ /^(VMS)$/;
19
20plan skip_all => "$test_name needs the dynamic engine feature enabled"
21    if disabled("engine") || disabled("dynamic-engine");
22
23plan skip_all => "$test_name needs the sock feature enabled"
24    if disabled("sock");
25
26plan skip_all => "$test_name needs TLS enabled"
27    if alldisabled(available_protocols("tls"));
28
29$ENV{OPENSSL_ia32cap} = '~0x200000200000000';
30my $proxy = TLSProxy::Proxy->new(
31    undef,
32    cmdstr(app(["openssl"]), display => 1),
33    srctop_file("apps", "server.pem"),
34    (!$ENV{HARNESS_ACTIVE} || $ENV{HARNESS_VERBOSE})
35);
36
37use constant {
38    NO_CORRUPTION => 0,
39    CORRUPT_SERVER_CERT_VERIFY => 1,
40    CORRUPT_CLIENT_CERT_VERIFY => 2,
41    CORRUPT_TLS1_2_SERVER_KEY_EXCHANGE => 3,
42};
43
44$proxy->filter(\&signature_filter);
45
46#Test 1: No corruption should succeed
47my $testtype = NO_CORRUPTION;
48$proxy->clientflags("-no_tls1_3") if disabled("ec") && disabled("dh");
49$proxy->start() or plan skip_all => "Unable to start up Proxy for tests";
50plan tests => 4;
51ok(TLSProxy::Message->success, "No corruption");
52
53SKIP: {
54    skip "TLSv1.3 disabled", 1
55        if disabled("tls1_3") || (disabled("ec") && disabled("dh"));
56
57    #Test 2: Corrupting a server CertVerify signature in TLSv1.3 should fail
58    $proxy->clear();
59    $testtype = CORRUPT_SERVER_CERT_VERIFY;
60    $proxy->start();
61    ok(TLSProxy::Message->fail, "Corrupt server TLSv1.3 CertVerify");
62
63    #Test x: Corrupting a client CertVerify signature in TLSv1.3 should fail
64    #$proxy->clear();
65    #$testtype = CORRUPT_CLIENT_CERT_VERIFY;
66    #$proxy->serverflags("-Verify 5");
67    #$proxy->clientflags("-cert ".srctop_file("apps", "server.pem"));
68    #$proxy->start();
69    #ok(TLSProxy::Message->fail, "Corrupt client TLSv1.3 CertVerify");
70    #TODO(TLS1.3): This test fails due to a problem in s_server/TLSProxy.
71    #Currently a connection is counted as "successful" if the client ends it
72    #with a close_notify. In TLSProxy the client initiates the closure of the
73    #connection so really we should not count it as successful until s_server
74    #has also responded with a close_notify. However s_server never sends a
75    #close_notify - it just closes the connection. Fixing this would be a
76    #significant change to the long established behaviour of s_server.
77    #Unfortunately in this test, it is the server that notices the incorrect
78    #signature and responds with an appropriate alert. However s_client never
79    #sees that because it occurs after the server Finished has been sent.
80    #Therefore s_client just continues to send its application data and sends
81    #its close_notify regardless. TLSProxy sees this and thinks that the
82    #connection was successful when in fact it was not. There isn't an easy fix
83    #for this, so leaving this test commented out for now.
84}
85
86SKIP: {
87    skip "TLS <= 1.2 disabled", 2
88        if alldisabled(("ssl3", "tls1", "tls1_1", "tls1_2"));
89
90    #Test 3: Corrupting a CertVerify signature in <=TLSv1.2 should fail
91    $proxy->clear();
92    $testtype = CORRUPT_CLIENT_CERT_VERIFY;
93    $proxy->serverflags("-Verify 5");
94    $proxy->clientflags("-no_tls1_3 -cert ".srctop_file("apps", "server.pem"));
95    $proxy->start();
96    ok(TLSProxy::Message->fail, "Corrupt <=TLSv1.2 CertVerify");
97
98    SKIP: {
99        skip "DH disabled", 1 if disabled("dh");
100
101        #Test 4: Corrupting a ServerKeyExchange signature in <=TLSv1.2 should
102        #fail
103        $proxy->clear();
104        $testtype = CORRUPT_TLS1_2_SERVER_KEY_EXCHANGE;
105        $proxy->clientflags("-no_tls1_3");
106        $proxy->cipherc('DHE-RSA-AES128-SHA');
107        $proxy->ciphers('DHE-RSA-AES128-SHA');
108        $proxy->start();
109        ok(TLSProxy::Message->fail, "Corrupt <=TLSv1.2 ServerKeyExchange");
110    }
111}
112
113sub signature_filter
114{
115    my $proxy = shift;
116    my $flight;
117    my $mt = TLSProxy::Message::MT_CERTIFICATE_VERIFY;
118
119    if ($testtype == CORRUPT_SERVER_CERT_VERIFY
120            || $testtype == CORRUPT_TLS1_2_SERVER_KEY_EXCHANGE
121            || (!disabled("tls1_3") && $testtype == NO_CORRUPTION)) {
122        $flight = 1;
123    } else {
124        $flight = 2;
125    }
126
127    # We're only interested in the initial server flight
128    return if ($proxy->flight != $flight);
129
130    $mt = TLSProxy::Message::MT_SERVER_KEY_EXCHANGE
131        if ($testtype == CORRUPT_TLS1_2_SERVER_KEY_EXCHANGE);
132
133    foreach my $message (@{$proxy->message_list}) {
134        if ($message->mt == $mt) {
135            my $sig = $message->signature();
136            my $sigbase = substr($sig, 0, -1);
137            my $sigend = unpack("C", substr($sig, -1));
138
139            #Flip bits in final byte of signature to corrupt the sig
140            $sigend ^= 0xff unless $testtype == NO_CORRUPTION;
141
142            $message->signature($sigbase.pack("C", $sigend));
143            $message->repack();
144        }
145    }
146}
147