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,
21 MT_SERVER_KEY_EXCHANGE => 12,
22 MT_CERTIFICATE_REQUEST => 13,
23 MT_SERVER_HELLO_DONE => 14,
24 MT_CERTIFICATE_VERIFY => 15,
25 MT_CLIENT_KEY_EXCHANGE => 16,
27 MT_CERTIFICATE_STATUS => 22,
39 AL_DESC_CLOSE_NOTIFY => 0
43 MT_HELLO_REQUEST, "HelloRequest",
44 MT_CLIENT_HELLO, "ClientHello",
45 MT_SERVER_HELLO, "ServerHello",
46 MT_NEW_SESSION_TICKET, "NewSessionTicket",
47 MT_CERTIFICATE, "Certificate",
48 MT_SERVER_KEY_EXCHANGE, "ServerKeyExchange",
49 MT_CERTIFICATE_REQUEST, "CertificateRequest",
50 MT_SERVER_HELLO_DONE, "ServerHelloDone",
51 MT_CERTIFICATE_VERIFY, "CertificateVerify",
52 MT_CLIENT_KEY_EXCHANGE, "ClientKeyExchange",
53 MT_FINISHED, "Finished",
54 MT_CERTIFICATE_STATUS, "CertificateStatus",
55 MT_NEXT_PROTO, "NextProto"
59 EXT_STATUS_REQUEST => 5,
60 EXT_ENCRYPT_THEN_MAC => 22,
61 EXT_EXTENDED_MASTER_SECRET => 23,
62 EXT_SESSION_TICKET => 35,
63 # This extension does not exist and isn't recognised by OpenSSL.
64 # We use it to test handling of duplicate extensions.
65 EXT_DUPLICATE_EXTENSION => 1234
75 my @message_rec_list = ();
76 my @message_frag_lens = ();
87 @message_rec_list = ();
88 @message_frag_lens = ();
91 #Class method to extract messages from a record
100 @message_frag_lens = ();
102 if ($serverin != $server && length($payload) != 0) {
103 die "Changed peer, but we still have fragment data\n";
107 if ($record->content_type == TLSProxy::Record::RT_CCS) {
108 if ($payload ne "") {
109 #We can't handle this yet
110 die "CCS received before message data complete\n";
113 TLSProxy::Record->server_ccs_seen(1);
115 TLSProxy::Record->client_ccs_seen(1);
117 } elsif ($record->content_type == TLSProxy::Record::RT_HANDSHAKE) {
118 if ($record->len == 0 || $record->len_real == 0) {
119 print " Message truncated\n";
123 if (length $payload > 0) {
124 #We are continuing processing a message started in a previous
125 #record. Add this record to the list associated with this
127 push @message_rec_list, $record;
129 if ($messlen <= length($payload)) {
131 die "Internal error: invalid messlen: ".$messlen
132 ." payload length:".length($payload)."\n";
134 if (length($payload) + $record->decrypt_len >= $messlen) {
135 #We can complete the message with this record
136 $recoffset = $messlen - length($payload);
137 $payload .= substr($record->decrypt_data, 0, $recoffset);
138 push @message_frag_lens, $recoffset;
139 $message = create_message($server, $mt, $payload,
141 push @messages, $message;
145 #This is just part of the total message
146 $payload .= $record->decrypt_data;
147 $recoffset = $record->decrypt_len;
148 push @message_frag_lens, $record->decrypt_len;
150 print " Partial message data read: ".$recoffset." bytes\n";
153 while ($record->decrypt_len > $recoffset) {
154 #We are at the start of a new message
155 if ($record->decrypt_len - $recoffset < 4) {
156 #Whilst technically probably valid we can't cope with this
157 die "End of record in the middle of a message header\n";
159 @message_rec_list = ($record);
162 ($mt, $lenhi, $lenlo) = unpack('CnC',
163 substr($record->decrypt_data,
165 $messlen = ($lenhi << 8) | $lenlo;
166 print " Message type: $message_type{$mt}\n";
167 print " Message Length: $messlen\n";
168 $startoffset = $recoffset;
172 if ($recoffset < $record->decrypt_len) {
173 #Some payload data is present in this record
174 if ($record->decrypt_len - $recoffset >= $messlen) {
175 #We can complete the message with this record
176 $payload .= substr($record->decrypt_data, $recoffset,
178 $recoffset += $messlen;
179 push @message_frag_lens, $messlen;
180 $message = create_message($server, $mt, $payload,
182 push @messages, $message;
186 #This is just part of the total message
187 $payload .= substr($record->decrypt_data, $recoffset,
188 $record->decrypt_len - $recoffset);
189 $recoffset = $record->decrypt_len;
190 push @message_frag_lens, $recoffset;
195 } elsif ($record->content_type == TLSProxy::Record::RT_APPLICATION_DATA) {
196 print " [ENCRYPTED APPLICATION DATA]\n";
197 print " [".$record->decrypt_data."]\n";
198 } elsif ($record->content_type == TLSProxy::Record::RT_ALERT) {
199 my ($alertlev, $alertdesc) = unpack('CC', $record->decrypt_data);
200 #All alerts end the test
202 #A CloseNotify from the client indicates we have finished successfully
204 if (!$server && $alertlev == AL_LEVEL_WARN
205 && $alertdesc == AL_DESC_CLOSE_NOTIFY) {
213 #Function to work out which sub-class we need to create and then
217 my ($server, $mt, $data, $startoffset) = @_;
220 #We only support ClientHello in this version...needs to be extended for
222 if ($mt == MT_CLIENT_HELLO) {
223 $message = TLSProxy::ClientHello->new(
231 } elsif ($mt == MT_SERVER_HELLO) {
232 $message = TLSProxy::ServerHello->new(
240 } elsif ($mt == MT_SERVER_KEY_EXCHANGE) {
241 $message = TLSProxy::ServerKeyExchange->new(
249 } elsif ($mt == MT_NEW_SESSION_TICKET) {
250 $message = TLSProxy::NewSessionTicket->new(
259 #Unknown message type
260 $message = TLSProxy::Message->new(
286 return !$success && $end;
296 $message_frag_lens) = @_;
303 startoffset => $startoffset,
304 message_frag_lens => $message_frag_lens
307 return bless $self, $class;
314 $ciphersuite = shift;
319 #Update all the underlying records with the modified data from this message
320 #Note: Does not currently support re-encrypting
326 my $numrecs = $#{$self->records};
328 $self->set_message_contents();
333 $lenlo = length($self->data) & 0xff;
334 $lenhi = length($self->data) >> 8;
335 $msgdata = pack('CnC', $self->mt, $lenhi, $lenlo).$self->data;
338 #The message is fully contained within one record
339 my ($rec) = @{$self->records};
340 my $recdata = $rec->decrypt_data;
344 # We use empty message_frag_lens to indicates that pre-repacking,
345 # the message wasn't present. The first fragment length doesn't include
346 # the TLS header, so we need to check and compute the right length.
347 if (@{$self->message_frag_lens}) {
348 $old_length = ${$self->message_frag_lens}[0] +
349 TLS_MESSAGE_HEADER_LENGTH;
354 my $prefix = substr($recdata, 0, $self->startoffset);
355 my $suffix = substr($recdata, $self->startoffset + $old_length);
357 $rec->decrypt_data($prefix.($msgdata).($suffix));
358 # TODO(openssl-team): don't keep explicit lengths.
359 # (If a length override is ever needed to construct invalid packets,
360 # use an explicit override field instead.)
361 $rec->decrypt_len(length($rec->decrypt_data));
362 $rec->len($rec->len + length($msgdata) - $old_length);
363 # Don't support re-encryption.
364 $rec->data($rec->decrypt_data);
366 #Update the fragment len in case we changed it above
367 ${$self->message_frag_lens}[0] = length($msgdata)
368 - TLS_MESSAGE_HEADER_LENGTH;
372 #Note we don't currently support changing a fragmented message length
375 foreach my $rec (@{$self->records}) {
376 my $recdata = $rec->decrypt_data;
378 #This is the first record
379 my $remainlen = length($recdata) - $self->startoffset;
380 $rec->data(substr($recdata, 0, $self->startoffset)
381 .substr(($msgdata), 0, $remainlen));
382 $datadone += $remainlen;
383 } elsif ($recctr + 1 == $numrecs) {
384 #This is the last record
385 $rec->data(substr($msgdata, $datadone));
387 #This is a middle record
388 $rec->data(substr($msgdata, $datadone, length($rec->data)));
389 $datadone += length($rec->data);
395 #To be overridden by sub-classes
396 sub set_message_contents
404 return $self->{server};
407 #Read/write accessors
420 $self->{data} = shift;
422 return $self->{data};
428 $self->{records} = shift;
430 return $self->{records};
436 $self->{startoffset} = shift;
438 return $self->{startoffset};
440 sub message_frag_lens
444 $self->{message_frag_lens} = shift;
446 return $self->{message_frag_lens};
451 return TLS_MESSAGE_HEADER_LENGTH + length($self->data);