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 #Unknown extension that should appear last
90 EXT_FORCE_LAST => 0xffff
94 CIPHER_DHE_RSA_AES_128_SHA => 0x0033,
95 CIPHER_ADH_AES_128_SHA => 0x0034
101 my $startoffset = -1;
105 my @message_rec_list = ();
106 my @message_frag_lens = ();
108 my $successondata = 0;
119 @message_rec_list = ();
120 @message_frag_lens = ();
123 #Class method to extract messages from a record
127 my $serverin = shift;
132 @message_frag_lens = ();
134 if ($serverin != $server && length($payload) != 0) {
135 die "Changed peer, but we still have fragment data\n";
139 if ($record->content_type == TLSProxy::Record::RT_CCS) {
140 if ($payload ne "") {
141 #We can't handle this yet
142 die "CCS received before message data complete\n";
145 TLSProxy::Record->server_encrypting(1);
147 TLSProxy::Record->client_encrypting(1);
149 } elsif ($record->content_type == TLSProxy::Record::RT_HANDSHAKE) {
150 if ($record->len == 0 || $record->len_real == 0) {
151 print " Message truncated\n";
155 if (length $payload > 0) {
156 #We are continuing processing a message started in a previous
157 #record. Add this record to the list associated with this
159 push @message_rec_list, $record;
161 if ($messlen <= length($payload)) {
163 die "Internal error: invalid messlen: ".$messlen
164 ." payload length:".length($payload)."\n";
166 if (length($payload) + $record->decrypt_len >= $messlen) {
167 #We can complete the message with this record
168 $recoffset = $messlen - length($payload);
169 $payload .= substr($record->decrypt_data, 0, $recoffset);
170 push @message_frag_lens, $recoffset;
171 $message = create_message($server, $mt, $payload,
173 push @messages, $message;
177 #This is just part of the total message
178 $payload .= $record->decrypt_data;
179 $recoffset = $record->decrypt_len;
180 push @message_frag_lens, $record->decrypt_len;
182 print " Partial message data read: ".$recoffset." bytes\n";
185 while ($record->decrypt_len > $recoffset) {
186 #We are at the start of a new message
187 if ($record->decrypt_len - $recoffset < 4) {
188 #Whilst technically probably valid we can't cope with this
189 die "End of record in the middle of a message header\n";
191 @message_rec_list = ($record);
194 ($mt, $lenhi, $lenlo) = unpack('CnC',
195 substr($record->decrypt_data,
197 $messlen = ($lenhi << 8) | $lenlo;
198 print " Message type: $message_type{$mt}\n";
199 print " Message Length: $messlen\n";
200 $startoffset = $recoffset;
204 if ($recoffset <= $record->decrypt_len) {
205 #Some payload data is present in this record
206 if ($record->decrypt_len - $recoffset >= $messlen) {
207 #We can complete the message with this record
208 $payload .= substr($record->decrypt_data, $recoffset,
210 $recoffset += $messlen;
211 push @message_frag_lens, $messlen;
212 $message = create_message($server, $mt, $payload,
214 push @messages, $message;
218 #This is just part of the total message
219 $payload .= substr($record->decrypt_data, $recoffset,
220 $record->decrypt_len - $recoffset);
221 $recoffset = $record->decrypt_len;
222 push @message_frag_lens, $recoffset;
227 } elsif ($record->content_type == TLSProxy::Record::RT_APPLICATION_DATA) {
228 print " [ENCRYPTED APPLICATION DATA]\n";
229 print " [".$record->decrypt_data."]\n";
231 if ($successondata) {
235 } elsif ($record->content_type == TLSProxy::Record::RT_ALERT) {
236 my ($alertlev, $alertdesc) = unpack('CC', $record->decrypt_data);
237 #A CloseNotify from the client indicates we have finished successfully
239 if (!$end && !$server && $alertlev == AL_LEVEL_WARN
240 && $alertdesc == AL_DESC_CLOSE_NOTIFY) {
243 #All alerts end the test
250 #Function to work out which sub-class we need to create and then
254 my ($server, $mt, $data, $startoffset) = @_;
257 #We only support ClientHello in this version...needs to be extended for
259 if ($mt == MT_CLIENT_HELLO) {
260 $message = TLSProxy::ClientHello->new(
268 } elsif ($mt == MT_HELLO_RETRY_REQUEST) {
269 $message = TLSProxy::HelloRetryRequest->new(
277 } elsif ($mt == MT_SERVER_HELLO) {
278 $message = TLSProxy::ServerHello->new(
286 } elsif ($mt == MT_ENCRYPTED_EXTENSIONS) {
287 $message = TLSProxy::EncryptedExtensions->new(
295 } elsif ($mt == MT_CERTIFICATE) {
296 $message = TLSProxy::Certificate->new(
304 } elsif ($mt == MT_CERTIFICATE_VERIFY) {
305 $message = TLSProxy::CertificateVerify->new(
313 } elsif ($mt == MT_SERVER_KEY_EXCHANGE) {
314 $message = TLSProxy::ServerKeyExchange->new(
322 } elsif ($mt == MT_NEW_SESSION_TICKET) {
323 $message = TLSProxy::NewSessionTicket->new(
332 #Unknown message type
333 $message = TLSProxy::Message->new(
359 return !$success && $end;
369 $message_frag_lens) = @_;
376 startoffset => $startoffset,
377 message_frag_lens => $message_frag_lens
380 return bless $self, $class;
387 $ciphersuite = shift;
392 #Update all the underlying records with the modified data from this message
393 #Note: Only supports re-encrypting for TLSv1.3
399 my $numrecs = $#{$self->records};
401 $self->set_message_contents();
406 $lenlo = length($self->data) & 0xff;
407 $lenhi = length($self->data) >> 8;
408 $msgdata = pack('CnC', $self->mt, $lenhi, $lenlo).$self->data;
411 #The message is fully contained within one record
412 my ($rec) = @{$self->records};
413 my $recdata = $rec->decrypt_data;
417 # We use empty message_frag_lens to indicates that pre-repacking,
418 # the message wasn't present. The first fragment length doesn't include
419 # the TLS header, so we need to check and compute the right length.
420 if (@{$self->message_frag_lens}) {
421 $old_length = ${$self->message_frag_lens}[0] +
422 TLS_MESSAGE_HEADER_LENGTH;
427 my $prefix = substr($recdata, 0, $self->startoffset);
428 my $suffix = substr($recdata, $self->startoffset + $old_length);
430 $rec->decrypt_data($prefix.($msgdata).($suffix));
431 # TODO(openssl-team): don't keep explicit lengths.
432 # (If a length override is ever needed to construct invalid packets,
433 # use an explicit override field instead.)
434 $rec->decrypt_len(length($rec->decrypt_data));
435 $rec->len($rec->len + length($msgdata) - $old_length);
436 # Only support re-encryption for TLSv1.3.
437 if (TLSProxy::Proxy->is_tls13() && $rec->encrypted()) {
438 #Add content type (1 byte) and 16 tag bytes
439 $rec->data($rec->decrypt_data
440 .pack("C", TLSProxy::Record::RT_HANDSHAKE).("\0"x16));
442 $rec->data($rec->decrypt_data);
445 #Update the fragment len in case we changed it above
446 ${$self->message_frag_lens}[0] = length($msgdata)
447 - TLS_MESSAGE_HEADER_LENGTH;
451 #Note we don't currently support changing a fragmented message length
454 foreach my $rec (@{$self->records}) {
455 my $recdata = $rec->decrypt_data;
457 #This is the first record
458 my $remainlen = length($recdata) - $self->startoffset;
459 $rec->data(substr($recdata, 0, $self->startoffset)
460 .substr(($msgdata), 0, $remainlen));
461 $datadone += $remainlen;
462 } elsif ($recctr + 1 == $numrecs) {
463 #This is the last record
464 $rec->data(substr($msgdata, $datadone));
466 #This is a middle record
467 $rec->data(substr($msgdata, $datadone, length($rec->data)));
468 $datadone += length($rec->data);
474 #To be overridden by sub-classes
475 sub set_message_contents
483 return $self->{server};
486 #Read/write accessors
499 $self->{data} = shift;
501 return $self->{data};
507 $self->{records} = shift;
509 return $self->{records};
515 $self->{startoffset} = shift;
517 return $self->{startoffset};
519 sub message_frag_lens
523 $self->{message_frag_lens} = shift;
525 return $self->{message_frag_lens};
530 return TLS_MESSAGE_HEADER_LENGTH + length($self->data);
536 $successondata = shift;
538 return $successondata;