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|
# 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::Message;
use constant TLS_MESSAGE_HEADER_LENGTH => 4;
#Message types
use constant {
MT_HELLO_REQUEST => 0,
MT_CLIENT_HELLO => 1,
MT_SERVER_HELLO => 2,
MT_NEW_SESSION_TICKET => 4,
MT_CERTIFICATE => 11,
MT_SERVER_KEY_EXCHANGE => 12,
MT_CERTIFICATE_REQUEST => 13,
MT_SERVER_HELLO_DONE => 14,
MT_CERTIFICATE_VERIFY => 15,
MT_CLIENT_KEY_EXCHANGE => 16,
MT_FINISHED => 20,
MT_CERTIFICATE_STATUS => 22,
MT_NEXT_PROTO => 67
};
#Alert levels
use constant {
AL_LEVEL_WARN => 1,
AL_LEVEL_FATAL => 2
};
#Alert descriptions
use constant {
AL_DESC_CLOSE_NOTIFY => 0,
AL_DESC_UNEXPECTED_MESSAGE => 10,
AL_DESC_NO_RENEGOTIATION => 100
};
my %message_type = (
MT_HELLO_REQUEST, "HelloRequest",
MT_CLIENT_HELLO, "ClientHello",
MT_SERVER_HELLO, "ServerHello",
MT_NEW_SESSION_TICKET, "NewSessionTicket",
MT_CERTIFICATE, "Certificate",
MT_SERVER_KEY_EXCHANGE, "ServerKeyExchange",
MT_CERTIFICATE_REQUEST, "CertificateRequest",
MT_SERVER_HELLO_DONE, "ServerHelloDone",
MT_CERTIFICATE_VERIFY, "CertificateVerify",
MT_CLIENT_KEY_EXCHANGE, "ClientKeyExchange",
MT_FINISHED, "Finished",
MT_CERTIFICATE_STATUS, "CertificateStatus",
MT_NEXT_PROTO, "NextProto"
);
use constant {
EXT_STATUS_REQUEST => 5,
EXT_ENCRYPT_THEN_MAC => 22,
EXT_EXTENDED_MASTER_SECRET => 23,
EXT_SESSION_TICKET => 35,
# This extension does not exist and isn't recognised by OpenSSL.
# We use it to test handling of duplicate extensions.
EXT_DUPLICATE_EXTENSION => 1234
};
my $payload = "";
my $messlen = -1;
my $mt;
my $startoffset = -1;
my $server = 0;
my $success = 0;
my $end = 0;
my @message_rec_list = ();
my @message_frag_lens = ();
my $ciphersuite = 0;
sub clear
{
$payload = "";
$messlen = -1;
$startoffset = -1;
$server = 0;
$success = 0;
$end = 0;
@message_rec_list = ();
@message_frag_lens = ();
}
#Class method to extract messages from a record
sub get_messages
{
my $class = shift;
my $serverin = shift;
my $record = shift;
my @messages = ();
my $message;
@message_frag_lens = ();
if ($serverin != $server && length($payload) != 0) {
die "Changed peer, but we still have fragment data\n";
}
$server = $serverin;
if ($record->content_type == TLSProxy::Record::RT_CCS) {
if ($payload ne "") {
#We can't handle this yet
die "CCS received before message data complete\n";
}
if ($server) {
TLSProxy::Record->server_ccs_seen(1);
} else {
TLSProxy::Record->client_ccs_seen(1);
}
} elsif ($record->content_type == TLSProxy::Record::RT_HANDSHAKE) {
if ($record->len == 0 || $record->len_real == 0) {
print " Message truncated\n";
} else {
my $recoffset = 0;
if (length $payload > 0) {
#We are continuing processing a message started in a previous
#record. Add this record to the list associated with this
#message
push @message_rec_list, $record;
if ($messlen <= length($payload)) {
#Shouldn't happen
die "Internal error: invalid messlen: ".$messlen
." payload length:".length($payload)."\n";
}
if (length($payload) + $record->decrypt_len >= $messlen) {
#We can complete the message with this record
$recoffset = $messlen - length($payload);
$payload .= substr($record->decrypt_data, 0, $recoffset);
push @message_frag_lens, $recoffset;
$message = create_message($server, $mt, $payload,
$startoffset);
push @messages, $message;
$payload = "";
} else {
#This is just part of the total message
$payload .= $record->decrypt_data;
$recoffset = $record->decrypt_len;
push @message_frag_lens, $record->decrypt_len;
}
print " Partial message data read: ".$recoffset." bytes\n";
}
while ($record->decrypt_len > $recoffset) {
#We are at the start of a new message
if ($record->decrypt_len - $recoffset < 4) {
#Whilst technically probably valid we can't cope with this
die "End of record in the middle of a message header\n";
}
@message_rec_list = ($record);
my $lenhi;
my $lenlo;
($mt, $lenhi, $lenlo) = unpack('CnC',
substr($record->decrypt_data,
$recoffset));
$messlen = ($lenhi << 8) | $lenlo;
print " Message type: $message_type{$mt}\n";
print " Message Length: $messlen\n";
$startoffset = $recoffset;
$recoffset += 4;
$payload = "";
if ($recoffset < $record->decrypt_len) {
#Some payload data is present in this record
if ($record->decrypt_len - $recoffset >= $messlen) {
#We can complete the message with this record
$payload .= substr($record->decrypt_data, $recoffset,
$messlen);
$recoffset += $messlen;
push @message_frag_lens, $messlen;
$message = create_message($server, $mt, $payload,
$startoffset);
push @messages, $message;
$payload = "";
} else {
#This is just part of the total message
$payload .= substr($record->decrypt_data, $recoffset,
$record->decrypt_len - $recoffset);
$recoffset = $record->decrypt_len;
push @message_frag_lens, $recoffset;
}
}
}
}
} elsif ($record->content_type == TLSProxy::Record::RT_APPLICATION_DATA) {
print " [ENCRYPTED APPLICATION DATA]\n";
print " [".$record->decrypt_data."]\n";
} elsif ($record->content_type == TLSProxy::Record::RT_ALERT) {
my ($alertlev, $alertdesc) = unpack('CC', $record->decrypt_data);
#All alerts end the test
$end = 1;
#A CloseNotify from the client indicates we have finished successfully
#(we assume)
if (!$server && $alertlev == AL_LEVEL_WARN
&& $alertdesc == AL_DESC_CLOSE_NOTIFY) {
$success = 1;
}
}
return @messages;
}
#Function to work out which sub-class we need to create and then
#construct it
sub create_message
{
my ($server, $mt, $data, $startoffset) = @_;
my $message;
#We only support ClientHello in this version...needs to be extended for
#others
if ($mt == MT_CLIENT_HELLO) {
$message = TLSProxy::ClientHello->new(
$server,
$data,
[@message_rec_list],
$startoffset,
[@message_frag_lens]
);
$message-&g
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