1 # Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
3 # Licensed under the OpenSSL license (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
10 package TLSProxy::Message;
12 use constant TLS_MESSAGE_HEADER_LENGTH => 4;
16 MT_HELLO_REQUEST => 0,
19 MT_NEW_SESSION_TICKET => 4,
20 MT_ENCRYPTED_EXTENSIONS => 8,
22 MT_SERVER_KEY_EXCHANGE => 12,
23 MT_CERTIFICATE_REQUEST => 13,
24 MT_SERVER_HELLO_DONE => 14,
25 MT_CERTIFICATE_VERIFY => 15,
26 MT_CLIENT_KEY_EXCHANGE => 16,
28 MT_CERTIFICATE_STATUS => 22,
40 AL_DESC_CLOSE_NOTIFY => 0,
41 AL_DESC_UNEXPECTED_MESSAGE => 10,
42 AL_DESC_NO_RENEGOTIATION => 100
46 MT_HELLO_REQUEST, "HelloRequest",
47 MT_CLIENT_HELLO, "ClientHello",
48 MT_SERVER_HELLO, "ServerHello",
49 MT_NEW_SESSION_TICKET, "NewSessionTicket",
50 MT_ENCRYPTED_EXTENSIONS, "EncryptedExtensions",
51 MT_CERTIFICATE, "Certificate",
52 MT_SERVER_KEY_EXCHANGE, "ServerKeyExchange",
53 MT_CERTIFICATE_REQUEST, "CertificateRequest",
54 MT_SERVER_HELLO_DONE, "ServerHelloDone",
55 MT_CERTIFICATE_VERIFY, "CertificateVerify",
56 MT_CLIENT_KEY_EXCHANGE, "ClientKeyExchange",
57 MT_FINISHED, "Finished",
58 MT_CERTIFICATE_STATUS, "CertificateStatus",
59 MT_NEXT_PROTO, "NextProto"
63 EXT_STATUS_REQUEST => 5,
64 EXT_SUPPORTED_GROUPS => 10,
65 EXT_ENCRYPT_THEN_MAC => 22,
66 EXT_EXTENDED_MASTER_SECRET => 23,
67 EXT_SESSION_TICKET => 35,
68 EXT_SUPPORTED_VERSIONS => 43,
70 # This extension does not exist and isn't recognised by OpenSSL.
71 # We use it to test handling of duplicate extensions.
72 EXT_DUPLICATE_EXTENSION => 1234
82 my @message_rec_list = ();
83 my @message_frag_lens = ();
94 @message_rec_list = ();
95 @message_frag_lens = ();
98 #Class method to extract messages from a record
102 my $serverin = shift;
107 @message_frag_lens = ();
109 if ($serverin != $server && length($payload) != 0) {
110 die "Changed peer, but we still have fragment data\n";
114 if ($record->content_type == TLSProxy::Record::RT_CCS) {
115 if ($payload ne "") {
116 #We can't handle this yet
117 die "CCS received before message data complete\n";
120 TLSProxy::Record->server_encrypting(1);
122 TLSProxy::Record->client_encrypting(1);
124 } elsif ($record->content_type == TLSProxy::Record::RT_HANDSHAKE) {
125 if ($record->len == 0 || $record->len_real == 0) {
126 print " Message truncated\n";
130 if (length $payload > 0) {
131 #We are continuing processing a message started in a previous
132 #record. Add this record to the list associated with this
134 push @message_rec_list, $record;
136 if ($messlen <= length($payload)) {
138 die "Internal error: invalid messlen: ".$messlen
139 ." payload length:".length($payload)."\n";
141 if (length($payload) + $record->decrypt_len >= $messlen) {
142 #We can complete the message with this record
143 $recoffset = $messlen - length($payload);
144 $payload .= substr($record->decrypt_data, 0, $recoffset);
145 push @message_frag_lens, $recoffset;
146 $message = create_message($server, $mt, $payload,
148 push @messages, $message;
152 #This is just part of the total message
153 $payload .= $record->decrypt_data;
154 $recoffset = $record->decrypt_len;
155 push @message_frag_lens, $record->decrypt_len;
157 print " Partial message data read: ".$recoffset." bytes\n";
160 while ($record->decrypt_len > $recoffset) {
161 #We are at the start of a new message
162 if ($record->decrypt_len - $recoffset < 4) {
163 #Whilst technically probably valid we can't cope with this
164 die "End of record in the middle of a message header\n";
166 @message_rec_list = ($record);
169 ($mt, $lenhi, $lenlo) = unpack('CnC',
170 substr($record->decrypt_data,
172 $messlen = ($lenhi << 8) | $lenlo;
173 print " Message type: $message_type{$mt}\n";
174 print " Message Length: $messlen\n";
175 $startoffset = $recoffset;
179 if ($recoffset < $record->decrypt_len) {
180 #Some payload data is present in this record
181 if ($record->decrypt_len - $recoffset >= $messlen) {
182 #We can complete the message with this record
183 $payload .= substr($record->decrypt_data, $recoffset,
185 $recoffset += $messlen;
186 push @message_frag_lens, $messlen;
187 $message = create_message($server, $mt, $payload,
189 push @messages, $message;
193 #This is just part of the total message
194 $payload .= substr($record->decrypt_data, $recoffset,
195 $record->decrypt_len - $recoffset);
196 $recoffset = $record->decrypt_len;
197 push @message_frag_lens, $recoffset;
202 } elsif ($record->content_type == TLSProxy::Record::RT_APPLICATION_DATA) {
203 print " [ENCRYPTED APPLICATION DATA]\n";
204 print " [".$record->decrypt_data."]\n";
205 } elsif ($record->content_type == TLSProxy::Record::RT_ALERT) {
206 my ($alertlev, $alertdesc) = unpack('CC', $record->decrypt_data);
207 #A CloseNotify from the client indicates we have finished successfully
209 if (!$end && !$server && $alertlev == AL_LEVEL_WARN
210 && $alertdesc == AL_DESC_CLOSE_NOTIFY) {
213 #All alerts end the test
220 #Function to work out which sub-class we need to create and then
224 my ($server, $mt, $data, $startoffset) = @_;
227 #We only support ClientHello in this version...needs to be extended for
229 if ($mt == MT_CLIENT_HELLO) {
230 $message = TLSProxy::ClientHello->new(
238 } elsif ($mt == MT_SERVER_HELLO) {
239 $message = TLSProxy::ServerHello->new(
247 } elsif ($mt == MT_SERVER_KEY_EXCHANGE) {
248 $message = TLSProxy::ServerKeyExchange->new(
256 } elsif ($mt == MT_NEW_SESSION_TICKET) {
257 $message = TLSProxy::NewSessionTicket->new(
266 #Unknown message type
267 $message = TLSProxy::Message->new(
293 return !$success && $end;
303 $message_frag_lens) = @_;
310 startoffset => $startoffset,
311 message_frag_lens => $message_frag_lens
314 return bless $self, $class;
321 $ciphersuite = shift;
326 #Update all the underlying records with the modified data from this message
327 #Note: Does not currently support re-encrypting
333 my $numrecs = $#{$self->records};
335 $self->set_message_contents();
340 $lenlo = length($self->data) & 0xff;
341 $lenhi = length($self->data) >> 8;
342 $msgdata = pack('CnC', $self->mt, $lenhi, $lenlo).$self->data;
345 #The message is fully contained within one record
346 my ($rec) = @{$self->records};
347 my $recdata = $rec->decrypt_data;
351 # We use empty message_frag_lens to indicates that pre-repacking,
352 # the message wasn't present. The first fragment length doesn't include
353 # the TLS header, so we need to check and compute the right length.
354 if (@{$self->message_frag_lens}) {
355 $old_length = ${$self->message_frag_lens}[0] +
356 TLS_MESSAGE_HEADER_LENGTH;
361 my $prefix = substr($recdata, 0, $self->startoffset);
362 my $suffix = substr($recdata, $self->startoffset + $old_length);
364 $rec->decrypt_data($prefix.($msgdata).($suffix));
365 # TODO(openssl-team): don't keep explicit lengths.
366 # (If a length override is ever needed to construct invalid packets,
367 # use an explicit override field instead.)
368 $rec->decrypt_len(length($rec->decrypt_data));
369 $rec->len($rec->len + length($msgdata) - $old_length);
370 # Don't support re-encryption.
371 $rec->data($rec->decrypt_data);
373 #Update the fragment len in case we changed it above
374 ${$self->message_frag_lens}[0] = length($msgdata)
375 - TLS_MESSAGE_HEADER_LENGTH;
379 #Note we don't currently support changing a fragmented message length
382 foreach my $rec (@{$self->records}) {
383 my $recdata = $rec->decrypt_data;
385 #This is the first record
386 my $remainlen = length($recdata) - $self->startoffset;
387 $rec->data(substr($recdata, 0, $self->startoffset)
388 .substr(($msgdata), 0, $remainlen));
389 $datadone += $remainlen;
390 } elsif ($recctr + 1 == $numrecs) {
391 #This is the last record
392 $rec->data(substr($msgdata, $datadone));
394 #This is a middle record
395 $rec->data(substr($msgdata, $datadone, length($rec->data)));
396 $datadone += length($rec->data);
402 #To be overridden by sub-classes
403 sub set_message_contents
411 return $self->{server};
414 #Read/write accessors
427 $self->{data} = shift;
429 return $self->{data};
435 $self->{records} = shift;
437 return $self->{records};
443 $self->{startoffset} = shift;
445 return $self->{startoffset};
447 sub message_frag_lens
451 $self->{message_frag_lens} = shift;
453 return $self->{message_frag_lens};
458 return TLS_MESSAGE_HEADER_LENGTH + length($self->data);