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,
40 AL_DESC_UNEXPECTED_MESSAGE => 10,
41 AL_DESC_NO_RENEGOTIATION => 100
45 MT_HELLO_REQUEST, "HelloRequest",
46 MT_CLIENT_HELLO, "ClientHello",
47 MT_SERVER_HELLO, "ServerHello",
48 MT_NEW_SESSION_TICKET, "NewSessionTicket",
49 MT_CERTIFICATE, "Certificate",
50 MT_SERVER_KEY_EXCHANGE, "ServerKeyExchange",
51 MT_CERTIFICATE_REQUEST, "CertificateRequest",
52 MT_SERVER_HELLO_DONE, "ServerHelloDone",
53 MT_CERTIFICATE_VERIFY, "CertificateVerify",
54 MT_CLIENT_KEY_EXCHANGE, "ClientKeyExchange",
55 MT_FINISHED, "Finished",
56 MT_CERTIFICATE_STATUS, "CertificateStatus",
57 MT_NEXT_PROTO, "NextProto"
61 EXT_STATUS_REQUEST => 5,
62 EXT_ENCRYPT_THEN_MAC => 22,
63 EXT_EXTENDED_MASTER_SECRET => 23,
64 EXT_SESSION_TICKET => 35,
65 EXT_SUPPORTED_VERSIONS => 43,
66 # This extension does not exist and isn't recognised by OpenSSL.
67 # We use it to test handling of duplicate extensions.
68 EXT_DUPLICATE_EXTENSION => 1234
78 my @message_rec_list = ();
79 my @message_frag_lens = ();
90 @message_rec_list = ();
91 @message_frag_lens = ();
94 #Class method to extract messages from a record
103 @message_frag_lens = ();
105 if ($serverin != $server && length($payload) != 0) {
106 die "Changed peer, but we still have fragment data\n";
110 if ($record->content_type == TLSProxy::Record::RT_CCS) {
111 if ($payload ne "") {
112 #We can't handle this yet
113 die "CCS received before message data complete\n";
116 TLSProxy::Record->server_ccs_seen(1);
118 TLSProxy::Record->client_ccs_seen(1);
120 } elsif ($record->content_type == TLSProxy::Record::RT_HANDSHAKE) {
121 if ($record->len == 0 || $record->len_real == 0) {
122 print " Message truncated\n";
126 if (length $payload > 0) {
127 #We are continuing processing a message started in a previous
128 #record. Add this record to the list associated with this
130 push @message_rec_list, $record;
132 if ($messlen <= length($payload)) {
134 die "Internal error: invalid messlen: ".$messlen
135 ." payload length:".length($payload)."\n";
137 if (length($payload) + $record->decrypt_len >= $messlen) {
138 #We can complete the message with this record
139 $recoffset = $messlen - length($payload);
140 $payload .= substr($record->decrypt_data, 0, $recoffset);
141 push @message_frag_lens, $recoffset;
142 $message = create_message($server, $mt, $payload,
144 push @messages, $message;
148 #This is just part of the total message
149 $payload .= $record->decrypt_data;
150 $recoffset = $record->decrypt_len;
151 push @message_frag_lens, $record->decrypt_len;
153 print " Partial message data read: ".$recoffset." bytes\n";
156 while ($record->decrypt_len > $recoffset) {
157 #We are at the start of a new message
158 if ($record->decrypt_len - $recoffset < 4) {
159 #Whilst technically probably valid we can't cope with this
160 die "End of record in the middle of a message header\n";
162 @message_rec_list = ($record);
165 ($mt, $lenhi, $lenlo) = unpack('CnC',
166 substr($record->decrypt_data,
168 $messlen = ($lenhi << 8) | $lenlo;
169 print " Message type: $message_type{$mt}\n";
170 print " Message Length: $messlen\n";
171 $startoffset = $recoffset;
175 if ($recoffset < $record->decrypt_len) {
176 #Some payload data is present in this record
177 if ($record->decrypt_len - $recoffset >= $messlen) {
178 #We can complete the message with this record
179 $payload .= substr($record->decrypt_data, $recoffset,
181 $recoffset += $messlen;
182 push @message_frag_lens, $messlen;
183 $message = create_message($server, $mt, $payload,
185 push @messages, $message;
189 #This is just part of the total message
190 $payload .= substr($record->decrypt_data, $recoffset,
191 $record->decrypt_len - $recoffset);
192 $recoffset = $record->decrypt_len;
193 push @message_frag_lens, $recoffset;
198 } elsif ($record->content_type == TLSProxy::Record::RT_APPLICATION_DATA) {
199 print " [ENCRYPTED APPLICATION DATA]\n";
200 print " [".$record->decrypt_data."]\n";
201 } elsif ($record->content_type == TLSProxy::Record::RT_ALERT) {
202 my ($alertlev, $alertdesc) = unpack('CC', $record->decrypt_data);
203 #A CloseNotify from the client indicates we have finished successfully
205 if (!$end && !$server && $alertlev == AL_LEVEL_WARN
206 && $alertdesc == AL_DESC_CLOSE_NOTIFY) {
209 #All alerts end the test
216 #Function to work out which sub-class we need to create and then
220 my ($server, $mt, $data, $startoffset) = @_;
223 #We only support ClientHello in this version...needs to be extended for
225 if ($mt == MT_CLIENT_HELLO) {
226 $message = TLSProxy::ClientHello->new(
234 } elsif ($mt == MT_SERVER_HELLO) {
235 $message = TLSProxy::ServerHello->new(
243 } elsif ($mt == MT_SERVER_KEY_EXCHANGE) {
244 $message = TLSProxy::ServerKeyExchange->new(
252 } elsif ($mt == MT_NEW_SESSION_TICKET) {
253 $message = TLSProxy::NewSessionTicket->new(
262 #Unknown message type
263 $message = TLSProxy::Message->new(
289 return !$success && $end;
299 $message_frag_lens) = @_;
306 startoffset => $startoffset,
307 message_frag_lens => $message_frag_lens
310 return bless $self, $class;
317 $ciphersuite = shift;
322 #Update all the underlying records with the modified data from this message
323 #Note: Does not currently support re-encrypting
329 my $numrecs = $#{$self->records};
331 $self->set_message_contents();
336 $lenlo = length($self->data) & 0xff;
337 $lenhi = length($self->data) >> 8;
338 $msgdata = pack('CnC', $self->mt, $lenhi, $lenlo).$self->data;
341 #The message is fully contained within one record
342 my ($rec) = @{$self->records};
343 my $recdata = $rec->decrypt_data;
347 # We use empty message_frag_lens to indicates that pre-repacking,
348 # the message wasn't present. The first fragment length doesn't include
349 # the TLS header, so we need to check and compute the right length.
350 if (@{$self->message_frag_lens}) {
351 $old_length = ${$self->message_frag_lens}[0] +
352 TLS_MESSAGE_HEADER_LENGTH;
357 my $prefix = substr($recdata, 0, $self->startoffset);
358 my $suffix = substr($recdata, $self->startoffset + $old_length);
360 $rec->decrypt_data($prefix.($msgdata).($suffix));
361 # TODO(openssl-team): don't keep explicit lengths.
362 # (If a length override is ever needed to construct invalid packets,
363 # use an explicit override field instead.)
364 $rec->decrypt_len(length($rec->decrypt_data));
365 $rec->len($rec->len + length($msgdata) - $old_length);
366 # Don't support re-encryption.
367 $rec->data($rec->decrypt_data);
369 #Update the fragment len in case we changed it above
370 ${$self->message_frag_lens}[0] = length($msgdata)
371 - TLS_MESSAGE_HEADER_LENGTH;
375 #Note we don't currently support changing a fragmented message length
378 foreach my $rec (@{$self->records}) {
379 my $recdata = $rec->decrypt_data;
381 #This is the first record
382 my $remainlen = length($recdata) - $self->startoffset;
383 $rec->data(substr($recdata, 0, $self->startoffset)
384 .substr(($msgdata), 0, $remainlen));
385 $datadone += $remainlen;
386 } elsif ($recctr + 1 == $numrecs) {
387 #This is the last record
388 $rec->data(substr($msgdata, $datadone));
390 #This is a middle record
391 $rec->data(substr($msgdata, $datadone, length($rec->data)));
392 $datadone += length($rec->data);
398 #To be overridden by sub-classes
399 sub set_message_contents
407 return $self->{server};
410 #Read/write accessors
423 $self->{data} = shift;
425 return $self->{data};
431 $self->{records} = shift;
433 return $self->{records};
439 $self->{startoffset} = shift;
441 return $self->{startoffset};
443 sub message_frag_lens
447 $self->{message_frag_lens} = shift;
449 return $self->{message_frag_lens};
454 return TLS_MESSAGE_HEADER_LENGTH + length($self->data);