635 lines
18 KiB
Perl
635 lines
18 KiB
Perl
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# Copyright 2016-2023 The OpenSSL Project Authors. All Rights Reserved.
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#
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# Licensed under the Apache License 2.0 (the "License"). You may not use
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# this file except in compliance with the License. You can obtain a copy
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# in the file LICENSE in the source distribution or at
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# https://www.openssl.org/source/license.html
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use strict;
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package TLSProxy::Message;
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use TLSProxy::Alert;
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use constant TLS_MESSAGE_HEADER_LENGTH => 4;
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#Message types
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use constant {
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MT_HELLO_REQUEST => 0,
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MT_CLIENT_HELLO => 1,
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MT_SERVER_HELLO => 2,
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MT_NEW_SESSION_TICKET => 4,
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MT_ENCRYPTED_EXTENSIONS => 8,
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MT_CERTIFICATE => 11,
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MT_SERVER_KEY_EXCHANGE => 12,
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MT_CERTIFICATE_REQUEST => 13,
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MT_SERVER_HELLO_DONE => 14,
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MT_CERTIFICATE_VERIFY => 15,
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MT_CLIENT_KEY_EXCHANGE => 16,
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MT_FINISHED => 20,
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MT_CERTIFICATE_STATUS => 22,
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MT_COMPRESSED_CERTIFICATE => 25,
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MT_NEXT_PROTO => 67
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};
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#Alert levels
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use constant {
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AL_LEVEL_WARN => 1,
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AL_LEVEL_FATAL => 2
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};
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#Alert descriptions
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use constant {
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AL_DESC_CLOSE_NOTIFY => 0,
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AL_DESC_UNEXPECTED_MESSAGE => 10,
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AL_DESC_ILLEGAL_PARAMETER => 47,
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AL_DESC_NO_RENEGOTIATION => 100
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};
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my %message_type = (
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MT_HELLO_REQUEST, "HelloRequest",
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MT_CLIENT_HELLO, "ClientHello",
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MT_SERVER_HELLO, "ServerHello",
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MT_NEW_SESSION_TICKET, "NewSessionTicket",
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MT_ENCRYPTED_EXTENSIONS, "EncryptedExtensions",
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MT_CERTIFICATE, "Certificate",
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MT_SERVER_KEY_EXCHANGE, "ServerKeyExchange",
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MT_CERTIFICATE_REQUEST, "CertificateRequest",
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MT_SERVER_HELLO_DONE, "ServerHelloDone",
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MT_CERTIFICATE_VERIFY, "CertificateVerify",
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MT_CLIENT_KEY_EXCHANGE, "ClientKeyExchange",
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MT_FINISHED, "Finished",
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MT_CERTIFICATE_STATUS, "CertificateStatus",
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MT_COMPRESSED_CERTIFICATE, "CompressedCertificate",
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MT_NEXT_PROTO, "NextProto"
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);
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use constant {
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EXT_SERVER_NAME => 0,
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EXT_MAX_FRAGMENT_LENGTH => 1,
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EXT_STATUS_REQUEST => 5,
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EXT_SUPPORTED_GROUPS => 10,
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EXT_EC_POINT_FORMATS => 11,
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EXT_SRP => 12,
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EXT_SIG_ALGS => 13,
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EXT_USE_SRTP => 14,
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EXT_ALPN => 16,
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EXT_SCT => 18,
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EXT_CLIENT_CERT_TYPE => 19,
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EXT_SERVER_CERT_TYPE => 20,
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EXT_PADDING => 21,
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EXT_ENCRYPT_THEN_MAC => 22,
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EXT_EXTENDED_MASTER_SECRET => 23,
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EXT_COMPRESS_CERTIFICATE => 27,
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EXT_SESSION_TICKET => 35,
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EXT_KEY_SHARE => 51,
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EXT_PSK => 41,
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EXT_SUPPORTED_VERSIONS => 43,
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EXT_COOKIE => 44,
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EXT_PSK_KEX_MODES => 45,
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EXT_POST_HANDSHAKE_AUTH => 49,
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EXT_SIG_ALGS_CERT => 50,
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EXT_RENEGOTIATE => 65281,
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EXT_NPN => 13172,
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EXT_CRYPTOPRO_BUG_EXTENSION => 0xfde8,
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EXT_UNKNOWN => 0xfffe,
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#Unknown extension that should appear last
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EXT_FORCE_LAST => 0xffff
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};
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# SignatureScheme of TLS 1.3 from:
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# https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#tls-signaturescheme
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# We have to manually grab the SHA224 equivalents from the old registry
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use constant {
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SIG_ALG_RSA_PKCS1_SHA256 => 0x0401,
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SIG_ALG_RSA_PKCS1_SHA384 => 0x0501,
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SIG_ALG_RSA_PKCS1_SHA512 => 0x0601,
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SIG_ALG_ECDSA_SECP256R1_SHA256 => 0x0403,
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SIG_ALG_ECDSA_SECP384R1_SHA384 => 0x0503,
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SIG_ALG_ECDSA_SECP521R1_SHA512 => 0x0603,
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SIG_ALG_RSA_PSS_RSAE_SHA256 => 0x0804,
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SIG_ALG_RSA_PSS_RSAE_SHA384 => 0x0805,
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SIG_ALG_RSA_PSS_RSAE_SHA512 => 0x0806,
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SIG_ALG_ED25519 => 0x0807,
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SIG_ALG_ED448 => 0x0808,
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SIG_ALG_RSA_PSS_PSS_SHA256 => 0x0809,
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SIG_ALG_RSA_PSS_PSS_SHA384 => 0x080a,
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SIG_ALG_RSA_PSS_PSS_SHA512 => 0x080b,
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SIG_ALG_RSA_PKCS1_SHA1 => 0x0201,
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SIG_ALG_ECDSA_SHA1 => 0x0203,
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SIG_ALG_DSA_SHA1 => 0x0202,
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SIG_ALG_DSA_SHA256 => 0x0402,
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SIG_ALG_DSA_SHA384 => 0x0502,
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SIG_ALG_DSA_SHA512 => 0x0602,
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OSSL_SIG_ALG_RSA_PKCS1_SHA224 => 0x0301,
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OSSL_SIG_ALG_DSA_SHA224 => 0x0302,
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OSSL_SIG_ALG_ECDSA_SHA224 => 0x0303
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};
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use constant {
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CIPHER_RSA_WITH_AES_128_CBC_SHA => 0x002f,
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CIPHER_DHE_RSA_AES_128_SHA => 0x0033,
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CIPHER_ADH_AES_128_SHA => 0x0034,
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CIPHER_TLS13_AES_128_GCM_SHA256 => 0x1301,
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CIPHER_TLS13_AES_256_GCM_SHA384 => 0x1302
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};
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use constant {
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CLIENT => 0,
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SERVER => 1
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};
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my $payload = "";
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my $messlen = -1;
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my $mt;
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my $startoffset = -1;
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my $server = 0;
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my $success = 0;
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my $end = 0;
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my @message_rec_list = ();
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my @message_frag_lens = ();
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my $ciphersuite = 0;
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my $successondata = 0;
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my $alert;
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sub clear
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{
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$payload = "";
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$messlen = -1;
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$startoffset = -1;
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$server = 0;
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$success = 0;
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$end = 0;
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$successondata = 0;
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@message_rec_list = ();
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@message_frag_lens = ();
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$alert = undef;
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}
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#Class method to extract messages from a record
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sub get_messages
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{
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my $class = shift;
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my $serverin = shift;
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my $record = shift;
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my @messages = ();
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my $message;
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@message_frag_lens = ();
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if ($serverin != $server && length($payload) != 0) {
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die "Changed peer, but we still have fragment data\n";
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}
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$server = $serverin;
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if ($record->content_type == TLSProxy::Record::RT_CCS) {
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if ($payload ne "") {
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#We can't handle this yet
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die "CCS received before message data complete\n";
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}
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if (!TLSProxy::Proxy->is_tls13()) {
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if ($server) {
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TLSProxy::Record->server_encrypting(1);
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} else {
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TLSProxy::Record->client_encrypting(1);
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}
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}
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} elsif ($record->content_type == TLSProxy::Record::RT_HANDSHAKE) {
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if ($record->len == 0 || $record->len_real == 0) {
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print " Message truncated\n";
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} else {
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my $recoffset = 0;
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if (length $payload > 0) {
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#We are continuing processing a message started in a previous
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#record. Add this record to the list associated with this
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#message
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push @message_rec_list, $record;
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if ($messlen <= length($payload)) {
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#Shouldn't happen
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die "Internal error: invalid messlen: ".$messlen
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." payload length:".length($payload)."\n";
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}
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if (length($payload) + $record->decrypt_len >= $messlen) {
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#We can complete the message with this record
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$recoffset = $messlen - length($payload);
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$payload .= substr($record->decrypt_data, 0, $recoffset);
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push @message_frag_lens, $recoffset;
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$message = create_message($server, $mt, $payload,
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$startoffset);
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push @messages, $message;
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$payload = "";
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} else {
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#This is just part of the total message
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$payload .= $record->decrypt_data;
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$recoffset = $record->decrypt_len;
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push @message_frag_lens, $record->decrypt_len;
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}
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print " Partial message data read: ".$recoffset." bytes\n";
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}
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while ($record->decrypt_len > $recoffset) {
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#We are at the start of a new message
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if ($record->decrypt_len - $recoffset < 4) {
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#Whilst technically probably valid we can't cope with this
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die "End of record in the middle of a message header\n";
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}
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@message_rec_list = ($record);
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my $lenhi;
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my $lenlo;
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($mt, $lenhi, $lenlo) = unpack('CnC',
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substr($record->decrypt_data,
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$recoffset));
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$messlen = ($lenhi << 8) | $lenlo;
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print " Message type: $message_type{$mt}\n";
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print " Message Length: $messlen\n";
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$startoffset = $recoffset;
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$recoffset += 4;
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$payload = "";
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if ($recoffset <= $record->decrypt_len) {
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#Some payload data is present in this record
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if ($record->decrypt_len - $recoffset >= $messlen) {
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#We can complete the message with this record
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$payload .= substr($record->decrypt_data, $recoffset,
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$messlen);
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$recoffset += $messlen;
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push @message_frag_lens, $messlen;
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$message = create_message($server, $mt, $payload,
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$startoffset);
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push @messages, $message;
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$payload = "";
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} else {
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#This is just part of the total message
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$payload .= substr($record->decrypt_data, $recoffset,
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$record->decrypt_len - $recoffset);
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$recoffset = $record->decrypt_len;
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push @message_frag_lens, $recoffset;
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}
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}
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}
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}
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} elsif ($record->content_type == TLSProxy::Record::RT_APPLICATION_DATA) {
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print " [ENCRYPTED APPLICATION DATA]\n";
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print " [".$record->decrypt_data."]\n";
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if ($successondata) {
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$success = 1;
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$end = 1;
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}
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} elsif ($record->content_type == TLSProxy::Record::RT_ALERT) {
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my ($alertlev, $alertdesc) = unpack('CC', $record->decrypt_data);
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print " [$alertlev, $alertdesc]\n";
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#A CloseNotify from the client indicates we have finished successfully
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#(we assume)
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if (!$end && !$server && $alertlev == AL_LEVEL_WARN
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&& $alertdesc == AL_DESC_CLOSE_NOTIFY) {
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$success = 1;
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}
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#Fatal or close notify alerts end the test
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if ($alertlev == AL_LEVEL_FATAL || $alertdesc == AL_DESC_CLOSE_NOTIFY) {
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$end = 1;
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}
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$alert = TLSProxy::Alert->new(
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$server,
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$record->encrypted,
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$alertlev,
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$alertdesc);
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}
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return @messages;
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}
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#Function to work out which sub-class we need to create and then
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#construct it
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sub create_message
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{
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my ($server, $mt, $data, $startoffset) = @_;
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my $message;
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#We only support ClientHello in this version...needs to be extended for
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#others
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if ($mt == MT_CLIENT_HELLO) {
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$message = TLSProxy::ClientHello->new(
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$server,
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$data,
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[@message_rec_list],
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$startoffset,
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[@message_frag_lens]
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);
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$message->parse();
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} elsif ($mt == MT_SERVER_HELLO) {
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$message = TLSProxy::ServerHello->new(
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$server,
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$data,
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[@message_rec_list],
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$startoffset,
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[@message_frag_lens]
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);
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$message->parse();
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} elsif ($mt == MT_ENCRYPTED_EXTENSIONS) {
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$message = TLSProxy::EncryptedExtensions->new(
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$server,
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$data,
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[@message_rec_list],
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$startoffset,
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[@message_frag_lens]
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);
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$message->parse();
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} elsif ($mt == MT_CERTIFICATE) {
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$message = TLSProxy::Certificate->new(
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$server,
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$data,
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[@message_rec_list],
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$startoffset,
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[@message_frag_lens]
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);
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$message->parse();
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} elsif ($mt == MT_CERTIFICATE_REQUEST) {
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$message = TLSProxy::CertificateRequest->new(
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$server,
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$data,
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[@message_rec_list],
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$startoffset,
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[@message_frag_lens]
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);
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$message->parse();
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} elsif ($mt == MT_CERTIFICATE_VERIFY) {
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$message = TLSProxy::CertificateVerify->new(
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$server,
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||
|
|
$data,
|
||
|
|
[@message_rec_list],
|
||
|
|
$startoffset,
|
||
|
|
[@message_frag_lens]
|
||
|
|
);
|
||
|
|
$message->parse();
|
||
|
|
} elsif ($mt == MT_SERVER_KEY_EXCHANGE) {
|
||
|
|
$message = TLSProxy::ServerKeyExchange->new(
|
||
|
|
$server,
|
||
|
|
$data,
|
||
|
|
[@message_rec_list],
|
||
|
|
$startoffset,
|
||
|
|
[@message_frag_lens]
|
||
|
|
);
|
||
|
|
$message->parse();
|
||
|
|
} elsif ($mt == MT_NEW_SESSION_TICKET) {
|
||
|
|
$message = TLSProxy::NewSessionTicket->new(
|
||
|
|
$server,
|
||
|
|
$data,
|
||
|
|
[@message_rec_list],
|
||
|
|
$startoffset,
|
||
|
|
[@message_frag_lens]
|
||
|
|
);
|
||
|
|
$message->parse();
|
||
|
|
} else {
|
||
|
|
#Unknown message type
|
||
|
|
$message = TLSProxy::Message->new(
|
||
|
|
$server,
|
||
|
|
$mt,
|
||
|
|
$data,
|
||
|
|
[@message_rec_list],
|
||
|
|
$startoffset,
|
||
|
|
[@message_frag_lens]
|
||
|
|
);
|
||
|
|
}
|
||
|
|
|
||
|
|
return $message;
|
||
|
|
}
|
||
|
|
|
||
|
|
sub end
|
||
|
|
{
|
||
|
|
my $class = shift;
|
||
|
|
return $end;
|
||
|
|
}
|
||
|
|
sub success
|
||
|
|
{
|
||
|
|
my $class = shift;
|
||
|
|
return $success;
|
||
|
|
}
|
||
|
|
sub fail
|
||
|
|
{
|
||
|
|
my $class = shift;
|
||
|
|
return !$success && $end;
|
||
|
|
}
|
||
|
|
|
||
|
|
sub alert
|
||
|
|
{
|
||
|
|
return $alert;
|
||
|
|
}
|
||
|
|
|
||
|
|
sub new
|
||
|
|
{
|
||
|
|
my $class = shift;
|
||
|
|
my ($server,
|
||
|
|
$mt,
|
||
|
|
$data,
|
||
|
|
$records,
|
||
|
|
$startoffset,
|
||
|
|
$message_frag_lens) = @_;
|
||
|
|
|
||
|
|
my $self = {
|
||
|
|
server => $server,
|
||
|
|
data => $data,
|
||
|
|
records => $records,
|
||
|
|
mt => $mt,
|
||
|
|
startoffset => $startoffset,
|
||
|
|
message_frag_lens => $message_frag_lens,
|
||
|
|
dupext => -1
|
||
|
|
};
|
||
|
|
|
||
|
|
return bless $self, $class;
|
||
|
|
}
|
||
|
|
|
||
|
|
sub ciphersuite
|
||
|
|
{
|
||
|
|
my $class = shift;
|
||
|
|
if (@_) {
|
||
|
|
$ciphersuite = shift;
|
||
|
|
}
|
||
|
|
return $ciphersuite;
|
||
|
|
}
|
||
|
|
|
||
|
|
#Update all the underlying records with the modified data from this message
|
||
|
|
#Note: Only supports TLSv1.3 and ETM encryption
|
||
|
|
sub repack
|
||
|
|
{
|
||
|
|
my $self = shift;
|
||
|
|
my $msgdata;
|
||
|
|
|
||
|
|
my $numrecs = $#{$self->records};
|
||
|
|
|
||
|
|
$self->set_message_contents();
|
||
|
|
|
||
|
|
my $lenhi;
|
||
|
|
my $lenlo;
|
||
|
|
|
||
|
|
$lenlo = length($self->data) & 0xff;
|
||
|
|
$lenhi = length($self->data) >> 8;
|
||
|
|
$msgdata = pack('CnC', $self->mt, $lenhi, $lenlo).$self->data;
|
||
|
|
|
||
|
|
if ($numrecs == 0) {
|
||
|
|
#The message is fully contained within one record
|
||
|
|
my ($rec) = @{$self->records};
|
||
|
|
my $recdata = $rec->decrypt_data;
|
||
|
|
|
||
|
|
my $old_length;
|
||
|
|
|
||
|
|
# We use empty message_frag_lens to indicates that pre-repacking,
|
||
|
|
# the message wasn't present. The first fragment length doesn't include
|
||
|
|
# the TLS header, so we need to check and compute the right length.
|
||
|
|
if (@{$self->message_frag_lens}) {
|
||
|
|
$old_length = ${$self->message_frag_lens}[0] +
|
||
|
|
TLS_MESSAGE_HEADER_LENGTH;
|
||
|
|
} else {
|
||
|
|
$old_length = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
my $prefix = substr($recdata, 0, $self->startoffset);
|
||
|
|
my $suffix = substr($recdata, $self->startoffset + $old_length);
|
||
|
|
|
||
|
|
$rec->decrypt_data($prefix.($msgdata).($suffix));
|
||
|
|
# TODO(openssl-team): don't keep explicit lengths.
|
||
|
|
# (If a length override is ever needed to construct invalid packets,
|
||
|
|
# use an explicit override field instead.)
|
||
|
|
$rec->decrypt_len(length($rec->decrypt_data));
|
||
|
|
# Only support re-encryption for TLSv1.3 and ETM.
|
||
|
|
if ($rec->encrypted()) {
|
||
|
|
if (TLSProxy::Proxy->is_tls13()) {
|
||
|
|
#Add content type (1 byte) and 16 tag bytes
|
||
|
|
$rec->data($rec->decrypt_data
|
||
|
|
.pack("C", TLSProxy::Record::RT_HANDSHAKE).("\0"x16));
|
||
|
|
} elsif ($rec->etm()) {
|
||
|
|
my $data = $rec->decrypt_data;
|
||
|
|
#Add padding
|
||
|
|
my $padval = length($data) % 16;
|
||
|
|
$padval = 15 - $padval;
|
||
|
|
for (0..$padval) {
|
||
|
|
$data .= pack("C", $padval);
|
||
|
|
}
|
||
|
|
|
||
|
|
#Add MAC. Assumed to be 20 bytes
|
||
|
|
foreach my $macval (0..19) {
|
||
|
|
$data .= pack("C", $macval);
|
||
|
|
}
|
||
|
|
|
||
|
|
if ($rec->version() >= TLSProxy::Record::VERS_TLS_1_1) {
|
||
|
|
#Explicit IV
|
||
|
|
$data = ("\0"x16).$data;
|
||
|
|
}
|
||
|
|
$rec->data($data);
|
||
|
|
} else {
|
||
|
|
die "Unsupported encryption: No ETM";
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
$rec->data($rec->decrypt_data);
|
||
|
|
}
|
||
|
|
$rec->len(length($rec->data));
|
||
|
|
|
||
|
|
#Update the fragment len in case we changed it above
|
||
|
|
${$self->message_frag_lens}[0] = length($msgdata)
|
||
|
|
- TLS_MESSAGE_HEADER_LENGTH;
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
#Note we don't currently support changing a fragmented message length
|
||
|
|
my $recctr = 0;
|
||
|
|
my $datadone = 0;
|
||
|
|
foreach my $rec (@{$self->records}) {
|
||
|
|
my $recdata = $rec->decrypt_data;
|
||
|
|
if ($recctr == 0) {
|
||
|
|
#This is the first record
|
||
|
|
my $remainlen = length($recdata) - $self->startoffset;
|
||
|
|
$rec->data(substr($recdata, 0, $self->startoffset)
|
||
|
|
.substr(($msgdata), 0, $remainlen));
|
||
|
|
$datadone += $remainlen;
|
||
|
|
} elsif ($recctr + 1 == $numrecs) {
|
||
|
|
#This is the last record
|
||
|
|
$rec->data(substr($msgdata, $datadone));
|
||
|
|
} else {
|
||
|
|
#This is a middle record
|
||
|
|
$rec->data(substr($msgdata, $datadone, length($rec->data)));
|
||
|
|
$datadone += length($rec->data);
|
||
|
|
}
|
||
|
|
$recctr++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#To be overridden by sub-classes
|
||
|
|
sub set_message_contents
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
#Read only accessors
|
||
|
|
sub server
|
||
|
|
{
|
||
|
|
my $self = shift;
|
||
|
|
return $self->{server};
|
||
|
|
}
|
||
|
|
|
||
|
|
#Read/write accessors
|
||
|
|
sub mt
|
||
|
|
{
|
||
|
|
my $self = shift;
|
||
|
|
if (@_) {
|
||
|
|
$self->{mt} = shift;
|
||
|
|
}
|
||
|
|
return $self->{mt};
|
||
|
|
}
|
||
|
|
sub data
|
||
|
|
{
|
||
|
|
my $self = shift;
|
||
|
|
if (@_) {
|
||
|
|
$self->{data} = shift;
|
||
|
|
}
|
||
|
|
return $self->{data};
|
||
|
|
}
|
||
|
|
sub records
|
||
|
|
{
|
||
|
|
my $self = shift;
|
||
|
|
if (@_) {
|
||
|
|
$self->{records} = shift;
|
||
|
|
}
|
||
|
|
return $self->{records};
|
||
|
|
}
|
||
|
|
sub startoffset
|
||
|
|
{
|
||
|
|
my $self = shift;
|
||
|
|
if (@_) {
|
||
|
|
$self->{startoffset} = shift;
|
||
|
|
}
|
||
|
|
return $self->{startoffset};
|
||
|
|
}
|
||
|
|
sub message_frag_lens
|
||
|
|
{
|
||
|
|
my $self = shift;
|
||
|
|
if (@_) {
|
||
|
|
$self->{message_frag_lens} = shift;
|
||
|
|
}
|
||
|
|
return $self->{message_frag_lens};
|
||
|
|
}
|
||
|
|
sub encoded_length
|
||
|
|
{
|
||
|
|
my $self = shift;
|
||
|
|
return TLS_MESSAGE_HEADER_LENGTH + length($self->data);
|
||
|
|
}
|
||
|
|
sub dupext
|
||
|
|
{
|
||
|
|
my $self = shift;
|
||
|
|
if (@_) {
|
||
|
|
$self->{dupext} = shift;
|
||
|
|
}
|
||
|
|
return $self->{dupext};
|
||
|
|
}
|
||
|
|
sub successondata
|
||
|
|
{
|
||
|
|
my $class = shift;
|
||
|
|
if (@_) {
|
||
|
|
$successondata = shift;
|
||
|
|
}
|
||
|
|
return $successondata;
|
||
|
|
}
|
||
|
|
1;
|