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_HELLO_RETRY_REQUEST => 6,
21 MT_ENCRYPTED_EXTENSIONS => 8,
23 MT_SERVER_KEY_EXCHANGE => 12,
24 MT_CERTIFICATE_REQUEST => 13,
25 MT_SERVER_HELLO_DONE => 14,
26 MT_CERTIFICATE_VERIFY => 15,
27 MT_CLIENT_KEY_EXCHANGE => 16,
29 MT_CERTIFICATE_STATUS => 22,
41 AL_DESC_CLOSE_NOTIFY => 0,
42 AL_DESC_UNEXPECTED_MESSAGE => 10,
43 AL_DESC_NO_RENEGOTIATION => 100
47 MT_HELLO_REQUEST, "HelloRequest",
48 MT_CLIENT_HELLO, "ClientHello",
49 MT_SERVER_HELLO, "ServerHello",
50 MT_NEW_SESSION_TICKET, "NewSessionTicket",
51 MT_HELLO_RETRY_REQUEST, "HelloRetryRequest",
52 MT_ENCRYPTED_EXTENSIONS, "EncryptedExtensions",
53 MT_CERTIFICATE, "Certificate",
54 MT_SERVER_KEY_EXCHANGE, "ServerKeyExchange",
55 MT_CERTIFICATE_REQUEST, "CertificateRequest",
56 MT_SERVER_HELLO_DONE, "ServerHelloDone",
57 MT_CERTIFICATE_VERIFY, "CertificateVerify",
58 MT_CLIENT_KEY_EXCHANGE, "ClientKeyExchange",
59 MT_FINISHED, "Finished",
60 MT_CERTIFICATE_STATUS, "CertificateStatus",
61 MT_NEXT_PROTO, "NextProto"
66 EXT_STATUS_REQUEST => 5,
67 EXT_SUPPORTED_GROUPS => 10,
68 EXT_EC_POINT_FORMATS => 11,
75 EXT_ENCRYPT_THEN_MAC => 22,
76 EXT_EXTENDED_MASTER_SECRET => 23,
77 EXT_SESSION_TICKET => 35,
80 EXT_SUPPORTED_VERSIONS => 43,
82 EXT_PSK_KEX_MODES => 45,
83 EXT_RENEGOTIATE => 65281,
85 # This extension is an unofficial extension only ever written by OpenSSL
86 # (i.e. not read), and even then only when enabled. We use it to test
87 # handling of duplicate extensions.
88 EXT_DUPLICATE_EXTENSION => 0xfde8,
89 EXT_UNKNOWN => 0xfffe,
90 #Unknown extension that should appear last
91 EXT_FORCE_LAST => 0xffff
95 CIPHER_DHE_RSA_AES_128_SHA => 0x0033,
96 CIPHER_ADH_AES_128_SHA => 0x0034,
97 CIPHER_TLS13_AES_128_GCM_SHA256 => 0x1301,
98 CIPHER_TLS13_AES_256_GCM_SHA384 => 0x1302
104 my $startoffset = -1;
108 my @message_rec_list = ();
109 my @message_frag_lens = ();
111 my $successondata = 0;
122 @message_rec_list = ();
123 @message_frag_lens = ();
126 #Class method to extract messages from a record
130 my $serverin = shift;
135 @message_frag_lens = ();
137 if ($serverin != $server && length($payload) != 0) {
138 die "Changed peer, but we still have fragment data\n";
142 if ($record->content_type == TLSProxy::Record::RT_CCS) {
143 if ($payload ne "") {
144 #We can't handle this yet
145 die "CCS received before message data complete\n";
148 TLSProxy::Record->server_encrypting(1);
150 TLSProxy::Record->client_encrypting(1);
152 } elsif ($record->content_type == TLSProxy::Record::RT_HANDSHAKE) {
153 if ($record->len == 0 || $record->len_real == 0) {
154 print " Message truncated\n";
158 if (length $payload > 0) {
159 #We are continuing processing a message started in a previous
160 #record. Add this record to the list associated with this
162 push @message_rec_list, $record;
164 if ($messlen <= length($payload)) {
166 die "Internal error: invalid messlen: ".$messlen
167 ." payload length:".length($payload)."\n";
169 if (length($payload) + $record->decrypt_len >= $messlen) {
170 #We can complete the message with this record
171 $recoffset = $messlen - length($payload);
172 $payload .= substr($record->decrypt_data, 0, $recoffset);
173 push @message_frag_lens, $recoffset;
174 $message = create_message($server, $mt, $payload,
176 push @messages, $message;
180 #This is just part of the total message
181 $payload .= $record->decrypt_data;
182 $recoffset = $record->decrypt_len;
183 push @message_frag_lens, $record->decrypt_len;
185 print " Partial message data read: ".$recoffset." bytes\n";
188 while ($record->decrypt_len > $recoffset) {
189 #We are at the start of a new message
190 if ($record->decrypt_len - $recoffset < 4) {
191 #Whilst technically probably valid we can't cope with this
192 die "End of record in the middle of a message header\n";
194 @message_rec_list = ($record);
197 ($mt, $lenhi, $lenlo) = unpack('CnC',
198 substr($record->decrypt_data,
200 $messlen = ($lenhi << 8) | $lenlo;
201 print " Message type: $message_type{$mt}\n";
202 print " Message Length: $messlen\n";
203 $startoffset = $recoffset;
207 if ($recoffset <= $record->decrypt_len) {
208 #Some payload data is present in this record
209 if ($record->decrypt_len - $recoffset >= $messlen) {
210 #We can complete the message with this record
211 $payload .= substr($record->decrypt_data, $recoffset,
213 $recoffset += $messlen;
214 push @message_frag_lens, $messlen;
215 $message = create_message($server, $mt, $payload,
217 push @messages, $message;
221 #This is just part of the total message
222 $payload .= substr($record->decrypt_data, $recoffset,
223 $record->decrypt_len - $recoffset);
224 $recoffset = $record->decrypt_len;
225 push @message_frag_lens, $recoffset;
230 } elsif ($record->content_type == TLSProxy::Record::RT_APPLICATION_DATA) {
231 print " [ENCRYPTED APPLICATION DATA]\n";
232 print " [".$record->decrypt_data."]\n";
234 if ($successondata) {
238 } elsif ($record->content_type == TLSProxy::Record::RT_ALERT) {
239 my ($alertlev, $alertdesc) = unpack('CC', $record->decrypt_data);
240 #A CloseNotify from the client indicates we have finished successfully
242 if (!$end && !$server && $alertlev == AL_LEVEL_WARN
243 && $alertdesc == AL_DESC_CLOSE_NOTIFY) {
246 #All alerts end the test
253 #Function to work out which sub-class we need to create and then
257 my ($server, $mt, $data, $startoffset) = @_;
260 #We only support ClientHello in this version...needs to be extended for
262 if ($mt == MT_CLIENT_HELLO) {
263 $message = TLSProxy::ClientHello->new(
271 } elsif ($mt == MT_HELLO_RETRY_REQUEST) {
272 $message = TLSProxy::HelloRetryRequest->new(
280 } elsif ($mt == MT_SERVER_HELLO) {
281 $message = TLSProxy::ServerHello->new(
289 } elsif ($mt == MT_ENCRYPTED_EXTENSIONS) {
290 $message = TLSProxy::EncryptedExtensions->new(
298 } elsif ($mt == MT_CERTIFICATE) {
299 $message = TLSProxy::Certificate->new(
307 } elsif ($mt == MT_CERTIFICATE_VERIFY) {
308 $message = TLSProxy::CertificateVerify->new(
316 } elsif ($mt == MT_SERVER_KEY_EXCHANGE) {
317 $message = TLSProxy::ServerKeyExchange->new(
325 } elsif ($mt == MT_NEW_SESSION_TICKET) {
326 $message = TLSProxy::NewSessionTicket->new(
335 #Unknown message type
336 $message = TLSProxy::Message->new(
362 return !$success && $end;
372 $message_frag_lens) = @_;
379 startoffset => $startoffset,
380 message_frag_lens => $message_frag_lens
383 return bless $self, $class;
390 $ciphersuite = shift;
395 #Update all the underlying records with the modified data from this message
396 #Note: Only supports re-encrypting for TLSv1.3
402 my $numrecs = $#{$self->records};
404 $self->set_message_contents();
409 $lenlo = length($self->data) & 0xff;
410 $lenhi = length($self->data) >> 8;
411 $msgdata = pack('CnC', $self->mt, $lenhi, $lenlo).$self->data;
414 #The message is fully contained within one record
415 my ($rec) = @{$self->records};
416 my $recdata = $rec->decrypt_data;
420 # We use empty message_frag_lens to indicates that pre-repacking,
421 # the message wasn't present. The first fragment length doesn't include
422 # the TLS header, so we need to check and compute the right length.
423 if (@{$self->message_frag_lens}) {
424 $old_length = ${$self->message_frag_lens}[0] +
425 TLS_MESSAGE_HEADER_LENGTH;
430 my $prefix = substr($recdata, 0, $self->startoffset);
431 my $suffix = substr($recdata, $self->startoffset + $old_length);
433 $rec->decrypt_data($prefix.($msgdata).($suffix));
434 # TODO(openssl-team): don't keep explicit lengths.
435 # (If a length override is ever needed to construct invalid packets,
436 # use an explicit override field instead.)
437 $rec->decrypt_len(length($rec->decrypt_data));
438 $rec->len($rec->len + length($msgdata) - $old_length);
439 # Only support re-encryption for TLSv1.3.
440 if (TLSProxy::Proxy->is_tls13() && $rec->encrypted()) {
441 #Add content type (1 byte) and 16 tag bytes
442 $rec->data($rec->decrypt_data
443 .pack("C", TLSProxy::Record::RT_HANDSHAKE).("\0"x16));
445 $rec->data($rec->decrypt_data);
448 #Update the fragment len in case we changed it above
449 ${$self->message_frag_lens}[0] = length($msgdata)
450 - TLS_MESSAGE_HEADER_LENGTH;
454 #Note we don't currently support changing a fragmented message length
457 foreach my $rec (@{$self->records}) {
458 my $recdata = $rec->decrypt_data;
460 #This is the first record
461 my $remainlen = length($recdata) - $self->startoffset;
462 $rec->data(substr($recdata, 0, $self->startoffset)
463 .substr(($msgdata), 0, $remainlen));
464 $datadone += $remainlen;
465 } elsif ($recctr + 1 == $numrecs) {
466 #This is the last record
467 $rec->data(substr($msgdata, $datadone));
469 #This is a middle record
470 $rec->data(substr($msgdata, $datadone, length($rec->data)));
471 $datadone += length($rec->data);
477 #To be overridden by sub-classes
478 sub set_message_contents
486 return $self->{server};
489 #Read/write accessors
502 $self->{data} = shift;
504 return $self->{data};
510 $self->{records} = shift;
512 return $self->{records};
518 $self->{startoffset} = shift;
520 return $self->{startoffset};
522 sub message_frag_lens
526 $self->{message_frag_lens} = shift;
528 return $self->{message_frag_lens};
533 return TLS_MESSAGE_HEADER_LENGTH + length($self->data);
539 $successondata = shift;
541 return $successondata;