--- /dev/null
+# Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
+#
+# Licensed under the OpenSSL license (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;
+
+package TLSProxy::ClientHello;
+
+use vars '@ISA';
+push @ISA, 'TLSProxy::Message';
+
+sub new
+{
+ my $class = shift;
+ my ($server,
+ $data,
+ $records,
+ $startoffset,
+ $message_frag_lens) = @_;
+
+ my $self = $class->SUPER::new(
+ $server,
+ 1,
+ $data,
+ $records,
+ $startoffset,
+ $message_frag_lens);
+
+ $self->{client_version} = 0;
+ $self->{random} = [];
+ $self->{session_id_len} = 0;
+ $self->{session} = "";
+ $self->{ciphersuite_len} = 0;
+ $self->{ciphersuites} = [];
+ $self->{comp_meth_len} = 0;
+ $self->{comp_meths} = [];
+ $self->{extensions_len} = 0;
+ $self->{extension_data} = "";
+
+ return $self;
+}
+
+sub parse
+{
+ my $self = shift;
+ my $ptr = 2;
+ my ($client_version) = unpack('n', $self->data);
+ my $random = substr($self->data, $ptr, 32);
+ $ptr += 32;
+ my $session_id_len = unpack('C', substr($self->data, $ptr));
+ $ptr++;
+ my $session = substr($self->data, $ptr, $session_id_len);
+ $ptr += $session_id_len;
+ my $ciphersuite_len = unpack('n', substr($self->data, $ptr));
+ $ptr += 2;
+ my @ciphersuites = unpack('n*', substr($self->data, $ptr,
+ $ciphersuite_len));
+ $ptr += $ciphersuite_len;
+ my $comp_meth_len = unpack('C', substr($self->data, $ptr));
+ $ptr++;
+ my @comp_meths = unpack('C*', substr($self->data, $ptr, $comp_meth_len));
+ $ptr += $comp_meth_len;
+ my $extensions_len = unpack('n', substr($self->data, $ptr));
+ $ptr += 2;
+ #For now we just deal with this as a block of data. In the future we will
+ #want to parse this
+ my $extension_data = substr($self->data, $ptr);
+
+ if (length($extension_data) != $extensions_len) {
+ die "Invalid extension length\n";
+ }
+ my %extensions = ();
+ while (length($extension_data) >= 4) {
+ my ($type, $size) = unpack("nn", $extension_data);
+ my $extdata = substr($extension_data, 4, $size);
+ $extension_data = substr($extension_data, 4 + $size);
+ $extensions{$type} = $extdata;
+ }
+
+ $self->client_version($client_version);
+ $self->random($random);
+ $self->session_id_len($session_id_len);
+ $self->session($session);
+ $self->ciphersuite_len($ciphersuite_len);
+ $self->ciphersuites(\@ciphersuites);
+ $self->comp_meth_len($comp_meth_len);
+ $self->comp_meths(\@comp_meths);
+ $self->extensions_len($extensions_len);
+ $self->extension_data(\%extensions);
+
+ $self->process_extensions();
+
+ print " Client Version:".$client_version."\n";
+ print " Session ID Len:".$session_id_len."\n";
+ print " Ciphersuite len:".$ciphersuite_len."\n";
+ print " Compression Method Len:".$comp_meth_len."\n";
+ print " Extensions Len:".$extensions_len."\n";
+}
+
+#Perform any actions necessary based on the extensions we've seen
+sub process_extensions
+{
+ my $self = shift;
+ my %extensions = %{$self->extension_data};
+
+ #Clear any state from a previous run
+ TLSProxy::Record->etm(0);
+
+ if (exists $extensions{TLSProxy::Message::EXT_ENCRYPT_THEN_MAC}) {
+ TLSProxy::Record->etm(1);
+ }
+}
+
+#Reconstruct the on-the-wire message data following changes
+sub set_message_contents
+{
+ my $self = shift;
+ my $data;
+ my $extensions = "";
+
+ $data = pack('n', $self->client_version);
+ $data .= $self->random;
+ $data .= pack('C', $self->session_id_len);
+ $data .= $self->session;
+ $data .= pack('n', $self->ciphersuite_len);
+ $data .= pack("n*", @{$self->ciphersuites});
+ $data .= pack('C', $self->comp_meth_len);
+ $data .= pack("C*", @{$self->comp_meths});
+
+ foreach my $key (keys %{$self->extension_data}) {
+ my $extdata = ${$self->extension_data}{$key};
+ $extensions .= pack("n", $key);
+ $extensions .= pack("n", length($extdata));
+ $extensions .= $extdata;
+ if ($key == TLSProxy::Message::EXT_DUPLICATE_EXTENSION) {
+ $extensions .= pack("n", $key);
+ $extensions .= pack("n", length($extdata));
+ $extensions .= $extdata;
+ }
+ }
+
+ $data .= pack('n', length($extensions));
+ $data .= $extensions;
+
+ $self->data($data);
+}
+
+#Read/write accessors
+sub client_version
+{
+ my $self = shift;
+ if (@_) {
+ $self->{client_version} = shift;
+ }
+ return $self->{client_version};
+}
+sub random
+{
+ my $self = shift;
+ if (@_) {
+ $self->{random} = shift;
+ }
+ return $self->{random};
+}
+sub session_id_len
+{
+ my $self = shift;
+ if (@_) {
+ $self->{session_id_len} = shift;
+ }
+ return $self->{session_id_len};
+}
+sub session
+{
+ my $self = shift;
+ if (@_) {
+ $self->{session} = shift;
+ }
+ return $self->{session};
+}
+sub ciphersuite_len
+{
+ my $self = shift;
+ if (@_) {
+ $self->{ciphersuite_len} = shift;
+ }
+ return $self->{ciphersuite_len};
+}
+sub ciphersuites
+{
+ my $self = shift;
+ if (@_) {
+ $self->{ciphersuites} = shift;
+ }
+ return $self->{ciphersuites};
+}
+sub comp_meth_len
+{
+ my $self = shift;
+ if (@_) {
+ $self->{comp_meth_len} = shift;
+ }
+ return $self->{comp_meth_len};
+}
+sub comp_meths
+{
+ my $self = shift;
+ if (@_) {
+ $self->{comp_meths} = shift;
+ }
+ return $self->{comp_meths};
+}
+sub extensions_len
+{
+ my $self = shift;
+ if (@_) {
+ $self->{extensions_len} = shift;
+ }
+ return $self->{extensions_len};
+}
+sub extension_data
+{
+ my $self = shift;
+ if (@_) {
+ $self->{extension_data} = shift;
+ }
+ return $self->{extension_data};
+}
+sub set_extension
+{
+ my ($self, $ext_type, $ext_data) = @_;
+ $self->{extension_data}{$ext_type} = $ext_data;
+}
+sub delete_extension
+{
+ my ($self, $ext_type) = @_;
+ delete $self->{extension_data}{$ext_type};
+}
+1;
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