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_MAX_FRAGMENT_LENGTH => 1,
65 EXT_STATUS_REQUEST => 5,
66 EXT_SUPPORTED_GROUPS => 10,
67 EXT_EC_POINT_FORMATS => 11,
74 EXT_ENCRYPT_THEN_MAC => 22,
75 EXT_EXTENDED_MASTER_SECRET => 23,
76 EXT_SESSION_TICKET => 35,
79 EXT_SUPPORTED_VERSIONS => 43,
81 EXT_PSK_KEX_MODES => 45,
82 EXT_SIG_ALGS_CERT => 50,
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
94 # SignatureScheme of TLS 1.3, from
95 # https://tools.ietf.org/html/draft-ietf-tls-tls13-20#appendix-B.3.1.3
96 # TODO(TLS1.3) update link to IANA registry after publication
97 # We have to manually grab the SHA224 equivalents from the old registry
99 SIG_ALG_RSA_PKCS1_SHA256 => 0x0401,
100 SIG_ALG_RSA_PKCS1_SHA384 => 0x0501,
101 SIG_ALG_RSA_PKCS1_SHA512 => 0x0601,
102 SIG_ALG_ECDSA_SECP256R1_SHA256 => 0x0403,
103 SIG_ALG_ECDSA_SECP384R1_SHA384 => 0x0503,
104 SIG_ALG_ECDSA_SECP521R1_SHA512 => 0x0603,
105 SIG_ALG_RSA_PSS_SHA256 => 0x0804,
106 SIG_ALG_RSA_PSS_SHA384 => 0x0805,
107 SIG_ALG_RSA_PSS_SHA512 => 0x0806,
108 SIG_ALG_ED25519 => 0x0807,
109 SIG_ALG_ED448 => 0x0808,
110 SIG_ALG_RSA_PKCS1_SHA1 => 0x0201,
111 SIG_ALG_ECDSA_SHA1 => 0x0203,
112 SIG_ALG_DSA_SHA1 => 0x0202,
113 SIG_ALG_DSA_SHA256 => 0x0402,
114 SIG_ALG_DSA_SHA384 => 0x0502,
115 SIG_ALG_DSA_SHA512 => 0x0602,
116 OSSL_SIG_ALG_RSA_PKCS1_SHA224 => 0x0301,
117 OSSL_SIG_ALG_DSA_SHA224 => 0x0302,
118 OSSL_SIG_ALG_ECDSA_SHA224 => 0x0303
122 CIPHER_DHE_RSA_AES_128_SHA => 0x0033,
123 CIPHER_ADH_AES_128_SHA => 0x0034,
124 CIPHER_TLS13_AES_128_GCM_SHA256 => 0x1301,
125 CIPHER_TLS13_AES_256_GCM_SHA384 => 0x1302
131 my $startoffset = -1;
135 my @message_rec_list = ();
136 my @message_frag_lens = ();
138 my $successondata = 0;
149 @message_rec_list = ();
150 @message_frag_lens = ();
153 #Class method to extract messages from a record
157 my $serverin = shift;
162 @message_frag_lens = ();
164 if ($serverin != $server && length($payload) != 0) {
165 die "Changed peer, but we still have fragment data\n";
169 if ($record->content_type == TLSProxy::Record::RT_CCS) {
170 if ($payload ne "") {
171 #We can't handle this yet
172 die "CCS received before message data complete\n";
174 if (!TLSProxy::Proxy->is_tls13()) {
176 TLSProxy::Record->server_encrypting(1);
178 TLSProxy::Record->client_encrypting(1);
181 } elsif ($record->content_type == TLSProxy::Record::RT_HANDSHAKE) {
182 if ($record->len == 0 || $record->len_real == 0) {
183 print " Message truncated\n";
187 if (length $payload > 0) {
188 #We are continuing processing a message started in a previous
189 #record. Add this record to the list associated with this
191 push @message_rec_list, $record;
193 if ($messlen <= length($payload)) {
195 die "Internal error: invalid messlen: ".$messlen
196 ." payload length:".length($payload)."\n";
198 if (length($payload) + $record->decrypt_len >= $messlen) {
199 #We can complete the message with this record
200 $recoffset = $messlen - length($payload);
201 $payload .= substr($record->decrypt_data, 0, $recoffset);
202 push @message_frag_lens, $recoffset;
203 $message = create_message($server, $mt, $payload,
205 push @messages, $message;
209 #This is just part of the total message
210 $payload .= $record->decrypt_data;
211 $recoffset = $record->decrypt_len;
212 push @message_frag_lens, $record->decrypt_len;
214 print " Partial message data read: ".$recoffset." bytes\n";
217 while ($record->decrypt_len > $recoffset) {
218 #We are at the start of a new message
219 if ($record->decrypt_len - $recoffset < 4) {
220 #Whilst technically probably valid we can't cope with this
221 die "End of record in the middle of a message header\n";
223 @message_rec_list = ($record);
226 ($mt, $lenhi, $lenlo) = unpack('CnC',
227 substr($record->decrypt_data,
229 $messlen = ($lenhi << 8) | $lenlo;
230 print " Message type: $message_type{$mt}\n";
231 print " Message Length: $messlen\n";
232 $startoffset = $recoffset;
236 if ($recoffset <= $record->decrypt_len) {
237 #Some payload data is present in this record
238 if ($record->decrypt_len - $recoffset >= $messlen) {
239 #We can complete the message with this record
240 $payload .= substr($record->decrypt_data, $recoffset,
242 $recoffset += $messlen;
243 push @message_frag_lens, $messlen;
244 $message = create_message($server, $mt, $payload,
246 push @messages, $message;
250 #This is just part of the total message
251 $payload .= substr($record->decrypt_data, $recoffset,
252 $record->decrypt_len - $recoffset);
253 $recoffset = $record->decrypt_len;
254 push @message_frag_lens, $recoffset;
259 } elsif ($record->content_type == TLSProxy::Record::RT_APPLICATION_DATA) {
260 print " [ENCRYPTED APPLICATION DATA]\n";
261 print " [".$record->decrypt_data."]\n";
263 if ($successondata) {
267 } elsif ($record->content_type == TLSProxy::Record::RT_ALERT) {
268 my ($alertlev, $alertdesc) = unpack('CC', $record->decrypt_data);
269 #A CloseNotify from the client indicates we have finished successfully
271 if (!$end && !$server && $alertlev == AL_LEVEL_WARN
272 && $alertdesc == AL_DESC_CLOSE_NOTIFY) {
275 #All alerts end the test
282 #Function to work out which sub-class we need to create and then
286 my ($server, $mt, $data, $startoffset) = @_;
289 #We only support ClientHello in this version...needs to be extended for
291 if ($mt == MT_CLIENT_HELLO) {
292 $message = TLSProxy::ClientHello->new(
300 } elsif ($mt == MT_SERVER_HELLO) {
301 $message = TLSProxy::ServerHello->new(
309 } elsif ($mt == MT_ENCRYPTED_EXTENSIONS) {
310 $message = TLSProxy::EncryptedExtensions->new(
318 } elsif ($mt == MT_CERTIFICATE) {
319 $message = TLSProxy::Certificate->new(
327 } elsif ($mt == MT_CERTIFICATE_VERIFY) {
328 $message = TLSProxy::CertificateVerify->new(
336 } elsif ($mt == MT_SERVER_KEY_EXCHANGE) {
337 $message = TLSProxy::ServerKeyExchange->new(
345 } elsif ($mt == MT_NEW_SESSION_TICKET) {
346 $message = TLSProxy::NewSessionTicket->new(
355 #Unknown message type
356 $message = TLSProxy::Message->new(
382 return !$success && $end;
392 $message_frag_lens) = @_;
399 startoffset => $startoffset,
400 message_frag_lens => $message_frag_lens
403 return bless $self, $class;
410 $ciphersuite = shift;
415 #Update all the underlying records with the modified data from this message
416 #Note: Only supports re-encrypting for TLSv1.3
422 my $numrecs = $#{$self->records};
424 $self->set_message_contents();
429 $lenlo = length($self->data) & 0xff;
430 $lenhi = length($self->data) >> 8;
431 $msgdata = pack('CnC', $self->mt, $lenhi, $lenlo).$self->data;
434 #The message is fully contained within one record
435 my ($rec) = @{$self->records};
436 my $recdata = $rec->decrypt_data;
440 # We use empty message_frag_lens to indicates that pre-repacking,
441 # the message wasn't present. The first fragment length doesn't include
442 # the TLS header, so we need to check and compute the right length.
443 if (@{$self->message_frag_lens}) {
444 $old_length = ${$self->message_frag_lens}[0] +
445 TLS_MESSAGE_HEADER_LENGTH;
450 my $prefix = substr($recdata, 0, $self->startoffset);
451 my $suffix = substr($recdata, $self->startoffset + $old_length);
453 $rec->decrypt_data($prefix.($msgdata).($suffix));
454 # TODO(openssl-team): don't keep explicit lengths.
455 # (If a length override is ever needed to construct invalid packets,
456 # use an explicit override field instead.)
457 $rec->decrypt_len(length($rec->decrypt_data));
458 $rec->len($rec->len + length($msgdata) - $old_length);
459 # Only support re-encryption for TLSv1.3.
460 if (TLSProxy::Proxy->is_tls13() && $rec->encrypted()) {
461 #Add content type (1 byte) and 16 tag bytes
462 $rec->data($rec->decrypt_data
463 .pack("C", TLSProxy::Record::RT_HANDSHAKE).("\0"x16));
465 $rec->data($rec->decrypt_data);
468 #Update the fragment len in case we changed it above
469 ${$self->message_frag_lens}[0] = length($msgdata)
470 - TLS_MESSAGE_HEADER_LENGTH;
474 #Note we don't currently support changing a fragmented message length
477 foreach my $rec (@{$self->records}) {
478 my $recdata = $rec->decrypt_data;
480 #This is the first record
481 my $remainlen = length($recdata) - $self->startoffset;
482 $rec->data(substr($recdata, 0, $self->startoffset)
483 .substr(($msgdata), 0, $remainlen));
484 $datadone += $remainlen;
485 } elsif ($recctr + 1 == $numrecs) {
486 #This is the last record
487 $rec->data(substr($msgdata, $datadone));
489 #This is a middle record
490 $rec->data(substr($msgdata, $datadone, length($rec->data)));
491 $datadone += length($rec->data);
497 #To be overridden by sub-classes
498 sub set_message_contents
506 return $self->{server};
509 #Read/write accessors
522 $self->{data} = shift;
524 return $self->{data};
530 $self->{records} = shift;
532 return $self->{records};
538 $self->{startoffset} = shift;
540 return $self->{startoffset};
542 sub message_frag_lens
546 $self->{message_frag_lens} = shift;
548 return $self->{message_frag_lens};
553 return TLS_MESSAGE_HEADER_LENGTH + length($self->data);
559 $successondata = shift;
561 return $successondata;