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      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 
      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 $class = shift;
     18     my ($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_REQUEST,
     27         $data,
     28         $records,
     29         $startoffset,
     30         $message_frag_lens);
     31 
     32     $self->{extension_data} = "";
     33 
     34     return $self;
     35 }
     36 
     37 sub parse
     38 {
     39     my $self = shift;
     40     my $ptr = 1;
     41 
     42     if (TLSProxy::Proxy->is_tls13()) {
     43         my $request_ctx_len = unpack('C', $self->data);
     44         my $request_ctx = substr($self->data, $ptr, $request_ctx_len);
     45         $ptr += $request_ctx_len;
     46 
     47         my $extensions_len = unpack('n', substr($self->data, $ptr));
     48         $ptr += 2;
     49         my $extension_data = substr($self->data, $ptr);
     50         if (length($extension_data) != $extensions_len) {
     51             die "Invalid extension length\n";
     52         }
     53         my %extensions = ();
     54         while (length($extension_data) >= 4) {
     55             my ($type, $size) = unpack("nn", $extension_data);
     56             my $extdata = substr($extension_data, 4, $size);
     57             $extension_data = substr($extension_data, 4 + $size);
     58             $extensions{$type} = $extdata;
     59         }
     60         $self->extension_data(\%extensions);
     61 
     62         print "    Extensions Len:".$extensions_len."\n";
     63     }
     64     # else parse TLSv1.2 version - we don't support that at the moment
     65 }
     66 
     67 #Reconstruct the on-the-wire message data following changes
     68 sub set_message_contents
     69 {
     70     my $self = shift;
     71     my $data;
     72     my $extensions = "";
     73 
     74     foreach my $key (keys %{$self->extension_data}) {
     75         my $extdata = ${$self->extension_data}{$key};
     76         $extensions .= pack("n", $key);
     77         $extensions .= pack("n", length($extdata));
     78         $extensions .= $extdata;
     79     }
     80 
     81     $data = pack('n', length($extensions));
     82     $data .= $extensions;
     83     $self->data($data);
     84 }
     85 
     86 #Read/write accessors
     87 sub extension_data
     88 {
     89     my $self = shift;
     90     if (@_) {
     91         $self->{extension_data} = shift;
     92     }
     93     return $self->{extension_data};
     94 }
     95 sub set_extension
     96 {
     97     my ($self, $ext_type, $ext_data) = @_;
     98     $self->{extension_data}{$ext_type} = $ext_data;
     99 }
    100 sub delete_extension
    101 {
    102     my ($self, $ext_type) = @_;
    103     delete $self->{extension_data}{$ext_type};
    104 }
    105 1;
    106