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"
64 EXT_STATUS_REQUEST => 5,
65 EXT_SUPPORTED_GROUPS => 10,
66 EXT_EC_POINT_FORMATS => 11,
73 EXT_ENCRYPT_THEN_MAC => 22,
74 EXT_EXTENDED_MASTER_SECRET => 23,
75 EXT_SESSION_TICKET => 35,
78 EXT_SUPPORTED_VERSIONS => 43,
79 EXT_PSK_KEX_MODES => 45,
80 EXT_RENEGOTIATE => 65281,
82 # This extension is an unofficial extension only ever written by OpenSSL
83 # (i.e. not read), and even then only when enabled. We use it to test
84 # handling of duplicate extensions.
85 EXT_DUPLICATE_EXTENSION => 0xfde8
89 CIPHER_DHE_RSA_AES_128_SHA => 0x0033,
90 CIPHER_ADH_AES_128_SHA => 0x0034
100 my @message_rec_list = ();
101 my @message_frag_lens = ();
103 my $successondata = 0;
114 @message_rec_list = ();
115 @message_frag_lens = ();
118 #Class method to extract messages from a record
122 my $serverin = shift;
127 @message_frag_lens = ();
129 if ($serverin != $server && length($payload) != 0) {
130 die "Changed peer, but we still have fragment data\n";
134 if ($record->content_type == TLSProxy::Record::RT_CCS) {
135 if ($payload ne "") {
136 #We can't handle this yet
137 die "CCS received before message data complete\n";
140 TLSProxy::Record->server_encrypting(1);
142 TLSProxy::Record->client_encrypting(1);
144 } elsif ($record->content_type == TLSProxy::Record::RT_HANDSHAKE) {
145 if ($record->len == 0 || $record->len_real == 0) {
146 print " Message truncated\n";
150 if (length $payload > 0) {
151 #We are continuing processing a message started in a previous
152 #record. Add this record to the list associated with this
154 push @message_rec_list, $record;
156 if ($messlen <= length($payload)) {
158 die "Internal error: invalid messlen: ".$messlen
159 ." payload length:".length($payload)."\n";
161 if (length($payload) + $record->decrypt_len >= $messlen) {
162 #We can complete the message with this record
163 $recoffset = $messlen - length($payload);
164 $payload .= substr($record->decrypt_data, 0, $recoffset);
165 push @message_frag_lens, $recoffset;
166 $message = create_message($server, $mt, $payload,
168 push @messages, $message;
172 #This is just part of the total message
173 $payload .= $record->decrypt_data;
174 $recoffset = $record->decrypt_len;
175 push @message_frag_lens, $record->decrypt_len;
177 print " Partial message data read: ".$recoffset." bytes\n";
180 while ($record->decrypt_len > $recoffset) {
181 #We are at the start of a new message
182 if ($record->decrypt_len - $recoffset < 4) {
183 #Whilst technically probably valid we can't cope with this
184 die "End of record in the middle of a message header\n";
186 @message_rec_list = ($record);
189 ($mt, $lenhi, $lenlo) = unpack('CnC',
190 substr($record->decrypt_data,
192 $messlen = ($lenhi << 8) | $lenlo;
193 print " Message type: $message_type{$mt}\n";
194 print " Message Length: $messlen\n";
195 $startoffset = $recoffset;
199 if ($recoffset <= $record->decrypt_len) {
200 #Some payload data is present in this record
201 if ($record->decrypt_len - $recoffset >= $messlen) {
202 #We can complete the message with this record
203 $payload .= substr($record->decrypt_data, $recoffset,
205 $recoffset += $messlen;
206 push @message_frag_lens, $messlen;
207 $message = create_message($server, $mt, $payload,
209 push @messages, $message;
213 #This is just part of the total message
214 $payload .= substr($record->decrypt_data, $recoffset,
215 $record->decrypt_len - $recoffset);
216 $recoffset = $record->decrypt_len;
217 push @message_frag_lens, $recoffset;
222 } elsif ($record->content_type == TLSProxy::Record::RT_APPLICATION_DATA) {
223 print " [ENCRYPTED APPLICATION DATA]\n";
224 print " [".$record->decrypt_data."]\n";
226 if ($successondata) {
230 } elsif ($record->content_type == TLSProxy::Record::RT_ALERT) {
231 my ($alertlev, $alertdesc) = unpack('CC', $record->decrypt_data);
232 #A CloseNotify from the client indicates we have finished successfully
234 if (!$end && !$server && $alertlev == AL_LEVEL_WARN
235 && $alertdesc == AL_DESC_CLOSE_NOTIFY) {
238 #All alerts end the test
245 #Function to work out which sub-class we need to create and then
249 my ($server, $mt, $data, $startoffset) = @_;
252 #We only support ClientHello in this version...needs to be extended for
254 if ($mt == MT_CLIENT_HELLO) {
255 $message = TLSProxy::ClientHello->new(
263 } elsif ($mt == MT_SERVER_HELLO) {
264 $message = TLSProxy::ServerHello->new(
272 } elsif ($mt == MT_ENCRYPTED_EXTENSIONS) {
273 $message = TLSProxy::EncryptedExtensions->new(
281 } elsif ($mt == MT_CERTIFICATE) {
282 $message = TLSProxy::Certificate->new(
290 } elsif ($mt == MT_CERTIFICATE_VERIFY) {
291 $message = TLSProxy::CertificateVerify->new(
299 } elsif ($mt == MT_SERVER_KEY_EXCHANGE) {
300 $message = TLSProxy::ServerKeyExchange->new(
308 } elsif ($mt == MT_NEW_SESSION_TICKET) {
309 $message = TLSProxy::NewSessionTicket->new(
318 #Unknown message type
319 $message = TLSProxy::Message->new(
345 return !$success && $end;
355 $message_frag_lens) = @_;
362 startoffset => $startoffset,
363 message_frag_lens => $message_frag_lens
366 return bless $self, $class;
373 $ciphersuite = shift;
378 #Update all the underlying records with the modified data from this message
379 #Note: Only supports re-encrypting for TLSv1.3
385 my $numrecs = $#{$self->records};
387 $self->set_message_contents();
392 $lenlo = length($self->data) & 0xff;
393 $lenhi = length($self->data) >> 8;
394 $msgdata = pack('CnC', $self->mt, $lenhi, $lenlo).$self->data;
397 #The message is fully contained within one record
398 my ($rec) = @{$self->records};
399 my $recdata = $rec->decrypt_data;
403 # We use empty message_frag_lens to indicates that pre-repacking,
404 # the message wasn't present. The first fragment length doesn't include
405 # the TLS header, so we need to check and compute the right length.
406 if (@{$self->message_frag_lens}) {
407 $old_length = ${$self->message_frag_lens}[0] +
408 TLS_MESSAGE_HEADER_LENGTH;
413 my $prefix = substr($recdata, 0, $self->startoffset);
414 my $suffix = substr($recdata, $self->startoffset + $old_length);
416 $rec->decrypt_data($prefix.($msgdata).($suffix));
417 # TODO(openssl-team): don't keep explicit lengths.
418 # (If a length override is ever needed to construct invalid packets,
419 # use an explicit override field instead.)
420 $rec->decrypt_len(length($rec->decrypt_data));
421 $rec->len($rec->len + length($msgdata) - $old_length);
422 # Only support re-encryption for TLSv1.3.
423 if (TLSProxy::Proxy->is_tls13() && $rec->encrypted()) {
424 #Add content type (1 byte) and 16 tag bytes
425 $rec->data($rec->decrypt_data
426 .pack("C", TLSProxy::Record::RT_HANDSHAKE).("\0"x16));
428 $rec->data($rec->decrypt_data);
431 #Update the fragment len in case we changed it above
432 ${$self->message_frag_lens}[0] = length($msgdata)
433 - TLS_MESSAGE_HEADER_LENGTH;
437 #Note we don't currently support changing a fragmented message length
440 foreach my $rec (@{$self->records}) {
441 my $recdata = $rec->decrypt_data;
443 #This is the first record
444 my $remainlen = length($recdata) - $self->startoffset;
445 $rec->data(substr($recdata, 0, $self->startoffset)
446 .substr(($msgdata), 0, $remainlen));
447 $datadone += $remainlen;
448 } elsif ($recctr + 1 == $numrecs) {
449 #This is the last record
450 $rec->data(substr($msgdata, $datadone));
452 #This is a middle record
453 $rec->data(substr($msgdata, $datadone, length($rec->data)));
454 $datadone += length($rec->data);
460 #To be overridden by sub-classes
461 sub set_message_contents
469 return $self->{server};
472 #Read/write accessors
485 $self->{data} = shift;
487 return $self->{data};
493 $self->{records} = shift;
495 return $self->{records};
501 $self->{startoffset} = shift;
503 return $self->{startoffset};
505 sub message_frag_lens
509 $self->{message_frag_lens} = shift;
511 return $self->{message_frag_lens};
516 return TLS_MESSAGE_HEADER_LENGTH + length($self->data);
522 $successondata = shift;
524 return $successondata;