xref: /freebsd/crypto/openssl/util/perl/TLSProxy/Certificate.pm (revision f126890ac5386406dadf7c4cfa9566cbb56537c5) 
1# Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
2#
3# Licensed under the Apache License 2.0 (the "License").  You may not use
4# this file except in compliance with the License.  You can obtain a copy
5# in the file LICENSE in the source distribution or at
6# https://www.openssl.org/source/license.html
7
8use strict;
9
10package TLSProxy::Certificate;
11
12use vars '@ISA';
13push @ISA, 'TLSProxy::Message';
14
15sub new
16{
17    my $class = shift;
18    my ($server,
19        $data,
20        $records,
21        $startoffset,
22        $message_frag_lens) = @_;
23
24    my $self = $class->SUPER::new(
25        $server,
26        TLSProxy::Message::MT_CERTIFICATE,
27        $data,
28        $records,
29        $startoffset,
30        $message_frag_lens);
31
32    $self->{first_certificate} = "";
33    $self->{extension_data} = "";
34    $self->{remaining_certdata} = "";
35
36    return $self;
37}
38
39sub parse
40{
41    my $self = shift;
42
43    if (TLSProxy::Proxy->is_tls13()) {
44        my $context_len = unpack('C', $self->data);
45        my $context = substr($self->data, 1, $context_len);
46
47        my $remdata = substr($self->data, 1 + $context_len);
48
49        my ($hicertlistlen, $certlistlen) = unpack('Cn', $remdata);
50        $certlistlen += ($hicertlistlen << 16);
51
52        $remdata = substr($remdata, 3);
53
54        die "Invalid Certificate List length"
55            if length($remdata) != $certlistlen;
56
57        my ($hicertlen, $certlen) = unpack('Cn', $remdata);
58        $certlen += ($hicertlen << 16);
59
60        die "Certificate too long" if ($certlen + 3) > $certlistlen;
61
62        $remdata = substr($remdata, 3);
63
64        my $certdata = substr($remdata, 0, $certlen);
65
66        $remdata = substr($remdata, $certlen);
67
68        my $extensions_len = unpack('n', $remdata);
69        $remdata = substr($remdata, 2);
70
71        die "Extensions too long"
72            if ($certlen + 3 + $extensions_len + 2) > $certlistlen;
73
74        my $extension_data = "";
75        if ($extensions_len != 0) {
76            $extension_data = substr($remdata, 0, $extensions_len);
77
78            if (length($extension_data) != $extensions_len) {
79                die "Invalid extension length\n";
80            }
81        }
82        my %extensions = ();
83        while (length($extension_data) >= 4) {
84            my ($type, $size) = unpack("nn", $extension_data);
85            my $extdata = substr($extension_data, 4, $size);
86            $extension_data = substr($extension_data, 4 + $size);
87            $extensions{$type} = $extdata;
88        }
89        $remdata = substr($remdata, $extensions_len);
90
91        $self->context($context);
92        $self->first_certificate($certdata);
93        $self->extension_data(\%extensions);
94        $self->remaining_certdata($remdata);
95
96        print "    Context:".$context."\n";
97        print "    Certificate List Len:".$certlistlen."\n";
98        print "    Certificate Len:".$certlen."\n";
99        print "    Extensions Len:".$extensions_len."\n";
100    } else {
101        my ($hicertlistlen, $certlistlen) = unpack('Cn', $self->data);
102        $certlistlen += ($hicertlistlen << 16);
103
104        my $remdata = substr($self->data, 3);
105
106        die "Invalid Certificate List length"
107            if length($remdata) != $certlistlen;
108
109        my ($hicertlen, $certlen) = unpack('Cn', $remdata);
110        $certlen += ($hicertlen << 16);
111
112        die "Certificate too long" if ($certlen + 3) > $certlistlen;
113
114        $remdata = substr($remdata, 3);
115
116        my $certdata = substr($remdata, 0, $certlen);
117
118        $remdata = substr($remdata, $certlen);
119
120        $self->first_certificate($certdata);
121        $self->remaining_certdata($remdata);
122
123        print "    Certificate List Len:".$certlistlen."\n";
124        print "    Certificate Len:".$certlen."\n";
125    }
126}
127
128#Reconstruct the on-the-wire message data following changes
129sub set_message_contents
130{
131    my $self = shift;
132    my $data;
133    my $extensions = "";
134
135    if (TLSProxy::Proxy->is_tls13()) {
136        foreach my $key (keys %{$self->extension_data}) {
137            my $extdata = ${$self->extension_data}{$key};
138            $extensions .= pack("n", $key);
139            $extensions .= pack("n", length($extdata));
140            $extensions .= $extdata;
141        }
142        $data = pack('C', length($self->context()));
143        $data .= $self->context;
144        my $certlen = length($self->first_certificate);
145        my $certlistlen = $certlen + length($extensions)
146                          + length($self->remaining_certdata);
147        my $hi = $certlistlen >> 16;
148        $certlistlen = $certlistlen & 0xffff;
149        $data .= pack('Cn', $hi, $certlistlen);
150        $hi = $certlen >> 16;
151        $certlen = $certlen & 0xffff;
152        $data .= pack('Cn', $hi, $certlen);
153        $data .= pack('n', length($extensions));
154        $data .= $extensions;
155        $data .= $self->remaining_certdata();
156        $self->data($data);
157    } else {
158        my $certlen = length($self->first_certificate);
159        my $certlistlen = $certlen + length($self->remaining_certdata);
160        my $hi = $certlistlen >> 16;
161        $certlistlen = $certlistlen & 0xffff;
162        $data .= pack('Cn', $hi, $certlistlen);
163        $hi = $certlen >> 16;
164        $certlen = $certlen & 0xffff;
165        $data .= pack('Cn', $hi, $certlen);
166        $data .= $self->remaining_certdata();
167        $self->data($data);
168    }
169}
170
171#Read/write accessors
172sub context
173{
174    my $self = shift;
175    if (@_) {
176      $self->{context} = shift;
177    }
178    return $self->{context};
179}
180sub first_certificate
181{
182    my $self = shift;
183    if (@_) {
184      $self->{first_certificate} = shift;
185    }
186    return $self->{first_certificate};
187}
188sub remaining_certdata
189{
190    my $self = shift;
191    if (@_) {
192      $self->{remaining_certdata} = shift;
193    }
194    return $self->{remaining_certdata};
195}
196sub extension_data
197{
198    my $self = shift;
199    if (@_) {
200      $self->{extension_data} = shift;
201    }
202    return $self->{extension_data};
203}
204sub set_extension
205{
206    my ($self, $ext_type, $ext_data) = @_;
207    $self->{extension_data}{$ext_type} = $ext_data;
208}
209sub delete_extension
210{
211    my ($self, $ext_type) = @_;
212    delete $self->{extension_data}{$ext_type};
213}
2141;
215