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,
77 EXT_SUPPORTED_VERSIONS => 43,
78 EXT_PSK_KEX_MODES => 45,
79 EXT_RENEGOTIATE => 65281,
81 # This extension is an unofficial extension only ever written by OpenSSL
82 # (i.e. not read), and even then only when enabled. We use it to test
83 # handling of duplicate extensions.
84 EXT_DUPLICATE_EXTENSION => 0xfde8
88 CIPHER_DHE_RSA_AES_128_SHA => 0x0033,
89 CIPHER_ADH_AES_128_SHA => 0x0034
99 my @message_rec_list = ();
100 my @message_frag_lens = ();
111 @message_rec_list = ();
112 @message_frag_lens = ();
115 #Class method to extract messages from a record
119 my $serverin = shift;
124 @message_frag_lens = ();
126 if ($serverin != $server && length($payload) != 0) {
127 die "Changed peer, but we still have fragment data\n";
131 if ($record->content_type == TLSProxy::Record::RT_CCS) {
132 if ($payload ne "") {
133 #We can't handle this yet
134 die "CCS received before message data complete\n";
137 TLSProxy::Record->server_encrypting(1);
139 TLSProxy::Record->client_encrypting(1);
141 } elsif ($record->content_type == TLSProxy::Record::RT_HANDSHAKE) {
142 if ($record->len == 0 || $record->len_real == 0) {
143 print " Message truncated\n";
147 if (length $payload > 0) {
148 #We are continuing processing a message started in a previous
149 #record. Add this record to the list associated with this
151 push @message_rec_list, $record;
153 if ($messlen <= length($payload)) {
155 die "Internal error: invalid messlen: ".$messlen
156 ." payload length:".length($payload)."\n";
158 if (length($payload) + $record->decrypt_len >= $messlen) {
159 #We can complete the message with this record
160 $recoffset = $messlen - length($payload);
161 $payload .= substr($record->decrypt_data, 0, $recoffset);
162 push @message_frag_lens, $recoffset;
163 $message = create_message($server, $mt, $payload,
165 push @messages, $message;
169 #This is just part of the total message
170 $payload .= $record->decrypt_data;
171 $recoffset = $record->decrypt_len;
172 push @message_frag_lens, $record->decrypt_len;
174 print " Partial message data read: ".$recoffset." bytes\n";
177 while ($record->decrypt_len > $recoffset) {
178 #We are at the start of a new message
179 if ($record->decrypt_len - $recoffset < 4) {
180 #Whilst technically probably valid we can't cope with this
181 die "End of record in the middle of a message header\n";
183 @message_rec_list = ($record);
186 ($mt, $lenhi, $lenlo) = unpack('CnC',
187 substr($record->decrypt_data,
189 $messlen = ($lenhi << 8) | $lenlo;
190 print " Message type: $message_type{$mt}\n";
191 print " Message Length: $messlen\n";
192 $startoffset = $recoffset;
196 if ($recoffset <= $record->decrypt_len) {
197 #Some payload data is present in this record
198 if ($record->decrypt_len - $recoffset >= $messlen) {
199 #We can complete the message with this record
200 $payload .= substr($record->decrypt_data, $recoffset,
202 $recoffset += $messlen;
203 push @message_frag_lens, $messlen;
204 $message = create_message($server, $mt, $payload,
206 push @messages, $message;
210 #This is just part of the total message
211 $payload .= substr($record->decrypt_data, $recoffset,
212 $record->decrypt_len - $recoffset);
213 $recoffset = $record->decrypt_len;
214 push @message_frag_lens, $recoffset;
219 } elsif ($record->content_type == TLSProxy::Record::RT_APPLICATION_DATA) {
220 print " [ENCRYPTED APPLICATION DATA]\n";
221 print " [".$record->decrypt_data."]\n";
222 } elsif ($record->content_type == TLSProxy::Record::RT_ALERT) {
223 my ($alertlev, $alertdesc) = unpack('CC', $record->decrypt_data);
224 #A CloseNotify from the client indicates we have finished successfully
226 if (!$end && !$server && $alertlev == AL_LEVEL_WARN
227 && $alertdesc == AL_DESC_CLOSE_NOTIFY) {
230 #All alerts end the test
237 #Function to work out which sub-class we need to create and then
241 my ($server, $mt, $data, $startoffset) = @_;
244 #We only support ClientHello in this version...needs to be extended for
246 if ($mt == MT_CLIENT_HELLO) {
247 $message = TLSProxy::ClientHello->new(
255 } elsif ($mt == MT_SERVER_HELLO) {
256 $message = TLSProxy::ServerHello->new(
264 } elsif ($mt == MT_ENCRYPTED_EXTENSIONS) {
265 $message = TLSProxy::EncryptedExtensions->new(
273 } elsif ($mt == MT_CERTIFICATE) {
274 $message = TLSProxy::Certificate->new(
282 } elsif ($mt == MT_CERTIFICATE_VERIFY) {
283 $message = TLSProxy::CertificateVerify->new(
291 } elsif ($mt == MT_SERVER_KEY_EXCHANGE) {
292 $message = TLSProxy::ServerKeyExchange->new(
300 } elsif ($mt == MT_NEW_SESSION_TICKET) {
301 $message = TLSProxy::NewSessionTicket->new(
310 #Unknown message type
311 $message = TLSProxy::Message->new(
337 return !$success && $end;
347 $message_frag_lens) = @_;
354 startoffset => $startoffset,
355 message_frag_lens => $message_frag_lens
358 return bless $self, $class;
365 $ciphersuite = shift;
370 #Update all the underlying records with the modified data from this message
371 #Note: Only supports re-encrypting for TLSv1.3
377 my $numrecs = $#{$self->records};
379 $self->set_message_contents();
384 $lenlo = length($self->data) & 0xff;
385 $lenhi = length($self->data) >> 8;
386 $msgdata = pack('CnC', $self->mt, $lenhi, $lenlo).$self->data;
389 #The message is fully contained within one record
390 my ($rec) = @{$self->records};
391 my $recdata = $rec->decrypt_data;
395 # We use empty message_frag_lens to indicates that pre-repacking,
396 # the message wasn't present. The first fragment length doesn't include
397 # the TLS header, so we need to check and compute the right length.
398 if (@{$self->message_frag_lens}) {
399 $old_length = ${$self->message_frag_lens}[0] +
400 TLS_MESSAGE_HEADER_LENGTH;
405 my $prefix = substr($recdata, 0, $self->startoffset);
406 my $suffix = substr($recdata, $self->startoffset + $old_length);
408 $rec->decrypt_data($prefix.($msgdata).($suffix));
409 # TODO(openssl-team): don't keep explicit lengths.
410 # (If a length override is ever needed to construct invalid packets,
411 # use an explicit override field instead.)
412 $rec->decrypt_len(length($rec->decrypt_data));
413 $rec->len($rec->len + length($msgdata) - $old_length);
414 # Only support re-encryption for TLSv1.3.
415 if (TLSProxy::Proxy->is_tls13() && $rec->encrypted()) {
416 #Add content type (1 byte) and 16 tag bytes
417 $rec->data($rec->decrypt_data
418 .pack("C", TLSProxy::Record::RT_HANDSHAKE).("\0"x16));
420 $rec->data($rec->decrypt_data);
423 #Update the fragment len in case we changed it above
424 ${$self->message_frag_lens}[0] = length($msgdata)
425 - TLS_MESSAGE_HEADER_LENGTH;
429 #Note we don't currently support changing a fragmented message length
432 foreach my $rec (@{$self->records}) {
433 my $recdata = $rec->decrypt_data;
435 #This is the first record
436 my $remainlen = length($recdata) - $self->startoffset;
437 $rec->data(substr($recdata, 0, $self->startoffset)
438 .substr(($msgdata), 0, $remainlen));
439 $datadone += $remainlen;
440 } elsif ($recctr + 1 == $numrecs) {
441 #This is the last record
442 $rec->data(substr($msgdata, $datadone));
444 #This is a middle record
445 $rec->data(substr($msgdata, $datadone, length($rec->data)));
446 $datadone += length($rec->data);
452 #To be overridden by sub-classes
453 sub set_message_contents
461 return $self->{server};
464 #Read/write accessors
477 $self->{data} = shift;
479 return $self->{data};
485 $self->{records} = shift;
487 return $self->{records};
493 $self->{startoffset} = shift;
495 return $self->{startoffset};
497 sub message_frag_lens
501 $self->{message_frag_lens} = shift;
503 return $self->{message_frag_lens};
508 return TLS_MESSAGE_HEADER_LENGTH + length($self->data);