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
44 MT_HELLO_REQUEST, "HelloRequest",
45 MT_CLIENT_HELLO, "ClientHello",
46 MT_SERVER_HELLO, "ServerHello",
47 MT_NEW_SESSION_TICKET, "NewSessionTicket",
48 MT_CERTIFICATE, "Certificate",
49 MT_SERVER_KEY_EXCHANGE, "ServerKeyExchange",
50 MT_CERTIFICATE_REQUEST, "CertificateRequest",
51 MT_SERVER_HELLO_DONE, "ServerHelloDone",
52 MT_CERTIFICATE_VERIFY, "CertificateVerify",
53 MT_CLIENT_KEY_EXCHANGE, "ClientKeyExchange",
54 MT_FINISHED, "Finished",
55 MT_CERTIFICATE_STATUS, "CertificateStatus",
56 MT_NEXT_PROTO, "NextProto"
60 EXT_STATUS_REQUEST => 5,
61 EXT_ENCRYPT_THEN_MAC => 22,
62 EXT_EXTENDED_MASTER_SECRET => 23,
63 EXT_SESSION_TICKET => 35,
64 # This extension does not exist and isn't recognised by OpenSSL.
65 # We use it to test handling of duplicate extensions.
66 EXT_DUPLICATE_EXTENSION => 1234
76 my @message_rec_list = ();
77 my @message_frag_lens = ();
88 @message_rec_list = ();
89 @message_frag_lens = ();
92 #Class method to extract messages from a record
101 @message_frag_lens = ();
103 if ($serverin != $server && length($payload) != 0) {
104 die "Changed peer, but we still have fragment data\n";
108 if ($record->content_type == TLSProxy::Record::RT_CCS) {
109 if ($payload ne "") {
110 #We can't handle this yet
111 die "CCS received before message data complete\n";
114 TLSProxy::Record->server_ccs_seen(1);
116 TLSProxy::Record->client_ccs_seen(1);
118 } elsif ($record->content_type == TLSProxy::Record::RT_HANDSHAKE) {
119 if ($record->len == 0 || $record->len_real == 0) {
120 print " Message truncated\n";
124 if (length $payload > 0) {
125 #We are continuing processing a message started in a previous
126 #record. Add this record to the list associated with this
128 push @message_rec_list, $record;
130 if ($messlen <= length($payload)) {
132 die "Internal error: invalid messlen: ".$messlen
133 ." payload length:".length($payload)."\n";
135 if (length($payload) + $record->decrypt_len >= $messlen) {
136 #We can complete the message with this record
137 $recoffset = $messlen - length($payload);
138 $payload .= substr($record->decrypt_data, 0, $recoffset);
139 push @message_frag_lens, $recoffset;
140 $message = create_message($server, $mt, $payload,
142 push @messages, $message;
146 #This is just part of the total message
147 $payload .= $record->decrypt_data;
148 $recoffset = $record->decrypt_len;
149 push @message_frag_lens, $record->decrypt_len;
151 print " Partial message data read: ".$recoffset." bytes\n";
154 while ($record->decrypt_len > $recoffset) {
155 #We are at the start of a new message
156 if ($record->decrypt_len - $recoffset < 4) {
157 #Whilst technically probably valid we can't cope with this
158 die "End of record in the middle of a message header\n";
160 @message_rec_list = ($record);
163 ($mt, $lenhi, $lenlo) = unpack('CnC',
164 substr($record->decrypt_data,
166 $messlen = ($lenhi << 8) | $lenlo;
167 print " Message type: $message_type{$mt}\n";
168 print " Message Length: $messlen\n";
169 $startoffset = $recoffset;
173 if ($recoffset < $record->decrypt_len) {
174 #Some payload data is present in this record
175 if ($record->decrypt_len - $recoffset >= $messlen) {
176 #We can complete the message with this record
177 $payload .= substr($record->decrypt_data, $recoffset,
179 $recoffset += $messlen;
180 push @message_frag_lens, $messlen;
181 $message = create_message($server, $mt, $payload,
183 push @messages, $message;
187 #This is just part of the total message
188 $payload .= substr($record->decrypt_data, $recoffset,
189 $record->decrypt_len - $recoffset);
190 $recoffset = $record->decrypt_len;
191 push @message_frag_lens, $recoffset;
196 } elsif ($record->content_type == TLSProxy::Record::RT_APPLICATION_DATA) {
197 print " [ENCRYPTED APPLICATION DATA]\n";
198 print " [".$record->decrypt_data."]\n";
199 } elsif ($record->content_type == TLSProxy::Record::RT_ALERT) {
200 my ($alertlev, $alertdesc) = unpack('CC', $record->decrypt_data);
201 #All alerts end the test
203 #A CloseNotify from the client indicates we have finished successfully
205 if (!$server && $alertlev == AL_LEVEL_WARN
206 && $alertdesc == AL_DESC_CLOSE_NOTIFY) {
214 #Function to work out which sub-class we need to create and then
218 my ($server, $mt, $data, $startoffset) = @_;
221 #We only support ClientHello in this version...needs to be extended for
223 if ($mt == MT_CLIENT_HELLO) {
224 $message = TLSProxy::ClientHello->new(
232 } elsif ($mt == MT_SERVER_HELLO) {
233 $message = TLSProxy::ServerHello->new(
241 } elsif ($mt == MT_SERVER_KEY_EXCHANGE) {
242 $message = TLSProxy::ServerKeyExchange->new(
250 } elsif ($mt == MT_NEW_SESSION_TICKET) {
251 $message = TLSProxy::NewSessionTicket->new(
260 #Unknown message type
261 $message = TLSProxy::Message->new(
287 return !$success && $end;
297 $message_frag_lens) = @_;
304 startoffset => $startoffset,
305 message_frag_lens => $message_frag_lens
308 return bless $self, $class;
315 $ciphersuite = shift;
320 #Update all the underlying records with the modified data from this message
321 #Note: Does not currently support re-encrypting
327 my $numrecs = $#{$self->records};
329 $self->set_message_contents();
334 $lenlo = length($self->data) & 0xff;
335 $lenhi = length($self->data) >> 8;
336 $msgdata = pack('CnC', $self->mt, $lenhi, $lenlo).$self->data;
339 #The message is fully contained within one record
340 my ($rec) = @{$self->records};
341 my $recdata = $rec->decrypt_data;
345 # We use empty message_frag_lens to indicates that pre-repacking,
346 # the message wasn't present. The first fragment length doesn't include
347 # the TLS header, so we need to check and compute the right length.
348 if (@{$self->message_frag_lens}) {
349 $old_length = ${$self->message_frag_lens}[0] +
350 TLS_MESSAGE_HEADER_LENGTH;
355 my $prefix = substr($recdata, 0, $self->startoffset);
356 my $suffix = substr($recdata, $self->startoffset + $old_length);
358 $rec->decrypt_data($prefix.($msgdata).($suffix));
359 # TODO(openssl-team): don't keep explicit lengths.
360 # (If a length override is ever needed to construct invalid packets,
361 # use an explicit override field instead.)
362 $rec->decrypt_len(length($rec->decrypt_data));
363 $rec->len($rec->len + length($msgdata) - $old_length);
364 # Don't support re-encryption.
365 $rec->data($rec->decrypt_data);
367 #Update the fragment len in case we changed it above
368 ${$self->message_frag_lens}[0] = length($msgdata)
369 - TLS_MESSAGE_HEADER_LENGTH;
373 #Note we don't currently support changing a fragmented message length
376 foreach my $rec (@{$self->records}) {
377 my $recdata = $rec->decrypt_data;
379 #This is the first record
380 my $remainlen = length($recdata) - $self->startoffset;
381 $rec->data(substr($recdata, 0, $self->startoffset)
382 .substr(($msgdata), 0, $remainlen));
383 $datadone += $remainlen;
384 } elsif ($recctr + 1 == $numrecs) {
385 #This is the last record
386 $rec->data(substr($msgdata, $datadone));
388 #This is a middle record
389 $rec->data(substr($msgdata, $datadone, length($rec->data)));
390 $datadone += length($rec->data);
396 #To be overridden by sub-classes
397 sub set_message_contents
405 return $self->{server};
408 #Read/write accessors
421 $self->{data} = shift;
423 return $self->{data};
429 $self->{records} = shift;
431 return $self->{records};
437 $self->{startoffset} = shift;
439 return $self->{startoffset};
441 sub message_frag_lens
445 $self->{message_frag_lens} = shift;
447 return $self->{message_frag_lens};
452 return TLS_MESSAGE_HEADER_LENGTH + length($self->data);