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      1 # Copyright 2016-2024 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 
      8 use strict;
      9 
     10 package TLSProxy::CertificateRequest;
     11 
     12 use vars '@ISA';
     13 push @ISA, 'TLSProxy::Message';
     14 
     15 sub new
     16 {
     17     my $class = shift;
     18     my ($isdtls,
     19         $server,
     20         $msgseq,
     21         $msgfrag,
     22         $msgfragoffs,
     23         $data,
     24         $records,
     25         $startoffset,
     26         $message_frag_lens) = @_;
     27 
     28     my $self = $class->SUPER::new(
     29         $isdtls,
     30         $server,
     31         TLSProxy::Message::MT_CERTIFICATE_REQUEST,
     32         $msgseq,
     33         $msgfrag,
     34         $msgfragoffs,
     35         $data,
     36         $records,
     37         $startoffset,
     38         $message_frag_lens);
     39 
     40     $self->{extension_data} = "";
     41 
     42     return $self;
     43 }
     44 
     45 sub parse
     46 {
     47     my $self = shift;
     48     my $ptr = 1;
     49 
     50     if (TLSProxy::Proxy->is_tls13()) {
     51         my $request_ctx_len = unpack('C', $self->data);
     52         my $request_ctx = substr($self->data, $ptr, $request_ctx_len);
     53         $ptr += $request_ctx_len;
     54 
     55         my $extensions_len = unpack('n', substr($self->data, $ptr));
     56         $ptr += 2;
     57         my $extension_data = substr($self->data, $ptr);
     58         if (length($extension_data) != $extensions_len) {
     59             die "Invalid extension length\n";
     60         }
     61         my %extensions = ();
     62         while (length($extension_data) >= 4) {
     63             my ($type, $size) = unpack("nn", $extension_data);
     64             my $extdata = substr($extension_data, 4, $size);
     65             $extension_data = substr($extension_data, 4 + $size);
     66             $extensions{$type} = $extdata;
     67         }
     68         $self->extension_data(\%extensions);
     69 
     70         print "    Extensions Len:".$extensions_len."\n";
     71     }
     72     # else parse TLSv1.2 version - we don't support that at the moment
     73 }
     74 
     75 #Reconstruct the on-the-wire message data following changes
     76 sub set_message_contents
     77 {
     78     my $self = shift;
     79     my $data;
     80     my $extensions = "";
     81 
     82     foreach my $key (keys %{$self->extension_data}) {
     83         my $extdata = ${$self->extension_data}{$key};
     84         $extensions .= pack("n", $key);
     85         $extensions .= pack("n", length($extdata));
     86         $extensions .= $extdata;
     87     }
     88 
     89     $data = pack('n', length($extensions));
     90     $data .= $extensions;
     91     $self->data($data);
     92 }
     93 
     94 #Read/write accessors
     95 sub extension_data
     96 {
     97     my $self = shift;
     98     if (@_) {
     99         $self->{extension_data} = shift;
    100     }
    101     return $self->{extension_data};
    102 }
    103 sub set_extension
    104 {
    105     my ($self, $ext_type, $ext_data) = @_;
    106     $self->{extension_data}{$ext_type} = $ext_data;
    107 }
    108 sub delete_extension
    109 {
    110     my ($self, $ext_type) = @_;
    111     delete $self->{extension_data}{$ext_type};
    112 }
    113 1;
    114