316 lines
6.7 KiB
Perl
316 lines
6.7 KiB
Perl
# 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;
|
|
|
|
use TLSProxy::Proxy;
|
|
|
|
package TLSProxy::Record;
|
|
|
|
my $server_ccs_seen = 0;
|
|
my $client_ccs_seen = 0;
|
|
my $etm = 0;
|
|
|
|
use constant TLS_RECORD_HEADER_LENGTH => 5;
|
|
|
|
#Record types
|
|
use constant {
|
|
RT_APPLICATION_DATA => 23,
|
|
RT_HANDSHAKE => 22,
|
|
RT_ALERT => 21,
|
|
RT_CCS => 20
|
|
};
|
|
|
|
my %record_type = (
|
|
RT_APPLICATION_DATA, "APPLICATION DATA",
|
|
RT_HANDSHAKE, "HANDSHAKE",
|
|
RT_ALERT, "ALERT",
|
|
RT_CCS, "CCS"
|
|
);
|
|
|
|
use constant {
|
|
VERS_TLS_1_3 => 772,
|
|
VERS_TLS_1_2 => 771,
|
|
VERS_TLS_1_1 => 770,
|
|
VERS_TLS_1_0 => 769,
|
|
VERS_SSL_3_0 => 768,
|
|
VERS_SSL_LT_3_0 => 767
|
|
};
|
|
|
|
my %tls_version = (
|
|
VERS_TLS_1_3, "TLS1.3",
|
|
VERS_TLS_1_2, "TLS1.2",
|
|
VERS_TLS_1_1, "TLS1.1",
|
|
VERS_TLS_1_0, "TLS1.0",
|
|
VERS_SSL_3_0, "SSL3",
|
|
VERS_SSL_LT_3_0, "SSL<3"
|
|
);
|
|
|
|
#Class method to extract records from a packet of data
|
|
sub get_records
|
|
{
|
|
my $class = shift;
|
|
my $server = shift;
|
|
my $flight = shift;
|
|
my $packet = shift;
|
|
my @record_list = ();
|
|
my @message_list = ();
|
|
my $data;
|
|
my $content_type;
|
|
my $version;
|
|
my $len;
|
|
my $len_real;
|
|
my $decrypt_len;
|
|
|
|
my $recnum = 1;
|
|
while (length ($packet) > 0) {
|
|
print " Record $recnum";
|
|
if ($server) {
|
|
print " (server -> client)\n";
|
|
} else {
|
|
print " (client -> server)\n";
|
|
}
|
|
#Get the record header
|
|
if (length($packet) < TLS_RECORD_HEADER_LENGTH) {
|
|
print "Partial data : ".length($packet)." bytes\n";
|
|
$packet = "";
|
|
} else {
|
|
($content_type, $version, $len) = unpack('CnnC*', $packet);
|
|
$data = substr($packet, 5, $len);
|
|
|
|
print " Content type: ".$record_type{$content_type}."\n";
|
|
print " Version: $tls_version{$version}\n";
|
|
print " Length: $len";
|
|
if ($len == length($data)) {
|
|
print "\n";
|
|
$decrypt_len = $len_real = $len;
|
|
} else {
|
|
print " (expected), ".length($data)." (actual)\n";
|
|
$decrypt_len = $len_real = length($data);
|
|
}
|
|
|
|
my $record = TLSProxy::Record->new(
|
|
$flight,
|
|
$content_type,
|
|
$version,
|
|
$len,
|
|
$len_real,
|
|
$decrypt_len,
|
|
substr($packet, TLS_RECORD_HEADER_LENGTH, $len_real),
|
|
substr($packet, TLS_RECORD_HEADER_LENGTH, $len_real)
|
|
);
|
|
|
|
if (($server && $server_ccs_seen)
|
|
|| (!$server && $client_ccs_seen)) {
|
|
if ($etm) {
|
|
$record->decryptETM();
|
|
} else {
|
|
$record->decrypt();
|
|
}
|
|
}
|
|
|
|
push @record_list, $record;
|
|
|
|
#Now figure out what messages are contained within this record
|
|
my @messages = TLSProxy::Message->get_messages($server, $record);
|
|
push @message_list, @messages;
|
|
|
|
$packet = substr($packet, TLS_RECORD_HEADER_LENGTH + $len_real);
|
|
$recnum++;
|
|
}
|
|
}
|
|
|
|
return (\@record_list, \@message_list);
|
|
}
|
|
|
|
sub clear
|
|
{
|
|
$server_ccs_seen = 0;
|
|
$client_ccs_seen = 0;
|
|
}
|
|
|
|
#Class level accessors
|
|
sub server_ccs_seen
|
|
{
|
|
my $class = shift;
|
|
if (@_) {
|
|
$server_ccs_seen = shift;
|
|
}
|
|
return $server_ccs_seen;
|
|
}
|
|
sub client_ccs_seen
|
|
{
|
|
my $class = shift;
|
|
if (@_) {
|
|
$client_ccs_seen = shift;
|
|
}
|
|
return $client_ccs_seen;
|
|
}
|
|
#Enable/Disable Encrypt-then-MAC
|
|
sub etm
|
|
{
|
|
my $class = shift;
|
|
if (@_) {
|
|
$etm = shift;
|
|
}
|
|
return $etm;
|
|
}
|
|
|
|
sub new
|
|
{
|
|
my $class = shift;
|
|
my ($flight,
|
|
$content_type,
|
|
$version,
|
|
$len,
|
|
$len_real,
|
|
$decrypt_len,
|
|
$data,
|
|
$decrypt_data) = @_;
|
|
|
|
my $self = {
|
|
flight => $flight,
|
|
content_type => $content_type,
|
|
version => $version,
|
|
len => $len,
|
|
len_real => $len_real,
|
|
decrypt_len => $decrypt_len,
|
|
data => $data,
|
|
decrypt_data => $decrypt_data,
|
|
orig_decrypt_data => $decrypt_data
|
|
};
|
|
|
|
return bless $self, $class;
|
|
}
|
|
|
|
#Decrypt using encrypt-then-MAC
|
|
sub decryptETM
|
|
{
|
|
my ($self) = shift;
|
|
|
|
my $data = $self->data;
|
|
|
|
if($self->version >= VERS_TLS_1_1()) {
|
|
#TLS1.1+ has an explicit IV. Throw it away
|
|
$data = substr($data, 16);
|
|
}
|
|
|
|
#Throw away the MAC (assumes MAC is 20 bytes for now. FIXME)
|
|
$data = substr($data, 0, length($data) - 20);
|
|
|
|
#Find out what the padding byte is
|
|
my $padval = unpack("C", substr($data, length($data) - 1));
|
|
|
|
#Throw away the padding
|
|
$data = substr($data, 0, length($data) - ($padval + 1));
|
|
|
|
$self->decrypt_data($data);
|
|
$self->decrypt_len(length($data));
|
|
|
|
return $data;
|
|
}
|
|
|
|
#Standard decrypt
|
|
sub decrypt()
|
|
{
|
|
my ($self) = shift;
|
|
|
|
my $data = $self->data;
|
|
|
|
if($self->version >= VERS_TLS_1_1()) {
|
|
#TLS1.1+ has an explicit IV. Throw it away
|
|
$data = substr($data, 16);
|
|
}
|
|
|
|
#Find out what the padding byte is
|
|
my $padval = unpack("C", substr($data, length($data) - 1));
|
|
|
|
#Throw away the padding
|
|
$data = substr($data, 0, length($data) - ($padval + 1));
|
|
|
|
#Throw away the MAC (assumes MAC is 20 bytes for now. FIXME)
|
|
$data = substr($data, 0, length($data) - 20);
|
|
|
|
$self->decrypt_data($data);
|
|
$self->decrypt_len(length($data));
|
|
|
|
return $data;
|
|
}
|
|
|
|
#Reconstruct the on-the-wire record representation
|
|
sub reconstruct_record
|
|
{
|
|
my $self = shift;
|
|
my $data;
|
|
|
|
$data = pack('Cnn', $self->content_type, $self->version, $self->len);
|
|
$data .= $self->data;
|
|
|
|
return $data;
|
|
}
|
|
|
|
#Read only accessors
|
|
sub flight
|
|
{
|
|
my $self = shift;
|
|
return $self->{flight};
|
|
}
|
|
sub content_type
|
|
{
|
|
my $self = shift;
|
|
return $self->{content_type};
|
|
}
|
|
sub version
|
|
{
|
|
my $self = shift;
|
|
return $self->{version};
|
|
}
|
|
sub len_real
|
|
{
|
|
my $self = shift;
|
|
return $self->{len_real};
|
|
}
|
|
sub orig_decrypt_data
|
|
{
|
|
my $self = shift;
|
|
return $self->{orig_decrypt_data};
|
|
}
|
|
|
|
#Read/write accessors
|
|
sub decrypt_len
|
|
{
|
|
my $self = shift;
|
|
if (@_) {
|
|
$self->{decrypt_len} = shift;
|
|
}
|
|
return $self->{decrypt_len};
|
|
}
|
|
sub data
|
|
{
|
|
my $self = shift;
|
|
if (@_) {
|
|
$self->{data} = shift;
|
|
}
|
|
return $self->{data};
|
|
}
|
|
sub decrypt_data
|
|
{
|
|
my $self = shift;
|
|
if (@_) {
|
|
$self->{decrypt_data} = shift;
|
|
}
|
|
return $self->{decrypt_data};
|
|
}
|
|
sub len
|
|
{
|
|
my $self = shift;
|
|
if (@_) {
|
|
$self->{len} = shift;
|
|
}
|
|
return $self->{len};
|
|
}
|
|
1;
|