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Extend TLSProxy capabilities

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Add ServerHello parsing to TLSProxy.
Also add some (very) limited ServerKeyExchange parsing.
Add the capability to set client and server cipher lists
Fix a bug with fragment lengths

Reviewed-by: Richard Levitte <levitte@openssl.org>
This commit is contained in:
Matt Caswell 2015-08-07 14:38:21 +01:00
parent 011467ee55
commit a1accbb1d7
4 changed files with 482 additions and 7 deletions
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36
util/TLSProxy/Message.pm
View File

@ -98,6 +98,7 @@ my $success = 0;
my $end = 0; my $end = 0;
my @message_rec_list = (); my @message_rec_list = ();
my @message_frag_lens = (); my @message_frag_lens = ();
my $ciphersuite = 0;
sub clear sub clear
{ {
@ -120,6 +121,8 @@ sub get_messages
my @messages = (); my @messages = ();
my $message; my $message;
@message_frag_lens = ();
if ($serverin != $server && length($payload) != 0) { if ($serverin != $server && length($payload) != 0) {
die "Changed peer, but we still have fragment data\n"; die "Changed peer, but we still have fragment data\n";
} }
@ -252,6 +255,24 @@ sub create_message
[@message_frag_lens] [@message_frag_lens]
); );
$message->parse(); $message->parse();
} elsif ($mt == MT_SERVER_HELLO) {
$message = TLSProxy::ServerHello->new(
$server,
$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();
} else { } else {
#Unknown message type #Unknown message type
$message = TLSProxy::Message->new( $message = TLSProxy::Message->new(
@ -277,7 +298,11 @@ sub success
my $class = shift; my $class = shift;
return $success; return $success;
} }
sub fail
{
my $class = shift;
return !$success && $end;
}
sub new sub new
{ {
my $class = shift; my $class = shift;
@ -300,6 +325,15 @@ sub new
return bless $self, $class; 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 #Update all the underlying records with the modified data from this message
#Note: Does not currently support re-encrypting #Note: Does not currently support re-encrypting
sub repack sub repack

42
util/TLSProxy/Proxy.pm
View File

@ -61,6 +61,8 @@ use IO::Select;
use TLSProxy::Record; use TLSProxy::Record;
use TLSProxy::Message; use TLSProxy::Message;
use TLSProxy::ClientHello; use TLSProxy::ClientHello;
use TLSProxy::ServerHello;
use TLSProxy::ServerKeyExchange;
sub new sub new
{ {
@ -82,6 +84,8 @@ sub new
execute => $execute, execute => $execute,
cert => $cert, cert => $cert,
debug => $debug, debug => $debug,
cipherc => "AES128-SHA",
ciphers => "",
flight => 0, flight => 0,
record_list => [], record_list => [],
message_list => [], message_list => [],
@ -97,6 +101,8 @@ sub clear
{ {
my $self = shift; my $self = shift;
$self->{cipherc} = "AES128-SHA";
$self->{ciphers} = "";
$self->{flight} = 0; $self->{flight} = 0;
$self->{record_list} = []; $self->{record_list} = [];
$self->{message_list} = []; $self->{message_list} = [];
@ -124,8 +130,13 @@ sub start
open(STDOUT, ">", File::Spec->devnull()) open(STDOUT, ">", File::Spec->devnull())
or die "Failed to redirect stdout"; or die "Failed to redirect stdout";
open(STDERR, ">&STDOUT"); open(STDERR, ">&STDOUT");
exec($self->execute." s_server -testmode -accept ".($self->server_port) my $execcmd = $self->execute." s_server -testmode -accept "
." -cert ".$self->cert." -naccept 1"); .($self->server_port)
." -cert ".$self->cert." -naccept 1";
if ($self->ciphers ne "") {
$execcmd .= " -cipher ".$self->ciphers;
}
exec($execcmd);
} }
my $oldstdout; my $oldstdout;
@ -155,9 +166,13 @@ sub start
open(STDOUT, ">", File::Spec->devnull()) open(STDOUT, ">", File::Spec->devnull())
or die "Failed to redirect stdout"; or die "Failed to redirect stdout";
open(STDERR, ">&STDOUT"); open(STDERR, ">&STDOUT");
exec($self->execute my $execcmd = $self->execute
." s_client -cipher AES128-SHA -testmode -connect " ." s_client -testmode -connect "
.($self->proxy_addr).":".($self->proxy_port)); .($self->proxy_addr).":".($self->proxy_port);
if ($self->cipherc ne "") {
$execcmd .= " -cipher ".$self->cipherc;
}
exec($execcmd);
} }
} }
@ -360,5 +375,20 @@ sub filter
} }
return $self->{filter}; return $self->{filter};
} }
sub cipherc
{
my $self = shift;
if (@_) {
$self->{cipherc} = shift;
}
return $self->{cipherc};
}
sub ciphers
{
my $self = shift;
if (@_) {
$self->{ciphers} = shift;
}
return $self->{ciphers};
}
1; 1;

235
util/TLSProxy/ServerHello.pm Normal file
View File

@ -0,0 +1,235 @@
# Written by Matt Caswell for the OpenSSL project.
# ====================================================================
# Copyright (c) 1998-2015 The OpenSSL Project. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
#
# 3. All advertising materials mentioning features or use of this
# software must display the following acknowledgment:
# "This product includes software developed by the OpenSSL Project
# for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
#
# 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
# endorse or promote products derived from this software without
# prior written permission. For written permission, please contact
# openssl-core@openssl.org.
#
# 5. Products derived from this software may not be called "OpenSSL"
# nor may "OpenSSL" appear in their names without prior written
# permission of the OpenSSL Project.
#
# 6. Redistributions of any form whatsoever must retain the following
# acknowledgment:
# "This product includes software developed by the OpenSSL Project
# for use in the OpenSSL Toolkit (http://www.openssl.org/)"
#
# THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
# EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
# ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
# OF THE POSSIBILITY OF SUCH DAMAGE.
# ====================================================================
#
# This product includes cryptographic software written by Eric Young
# (eay@cryptsoft.com). This product includes software written by Tim
# Hudson (tjh@cryptsoft.com).
use strict;
package TLSProxy::ServerHello;
use parent 'TLSProxy::Message';
sub new
{
my $class = shift;
my ($server,
$data,
$records,
$startoffset,
$message_frag_lens) = @_;
my $self = $class->SUPER::new(
$server,
TLSProxy::Message::MT_SERVER_HELLO,
$data,
$records,
$startoffset,
$message_frag_lens);
$self->{server_version} = 0;
$self->{random} = [];
$self->{session_id_len} = 0;
$self->{session} = "";
$self->{ciphersuite} = 0;
$self->{comp_meth} = 0;
$self->{extensions_len} = 0;
$self->{extensions_data} = "";
return $self;
}
sub parse
{
my $self = shift;
my $ptr = 2;
my ($server_version) = unpack('n', $self->data);
my $random = substr($self->data, $ptr, 32);
$ptr += 32;
my $session_id_len = unpack('C', substr($self->data, $ptr));
$ptr++;
my $session = substr($self->data, $ptr, $session_id_len);
$ptr += $session_id_len;
my $ciphersuite = unpack('n', substr($self->data, $ptr));
$ptr += 2;
my $comp_meth = unpack('C', substr($self->data, $ptr));
$ptr++;
my $extensions_len = unpack('n', substr($self->data, $ptr));
$ptr += 2;
#For now we just deal with this as a block of data. In the future we will
#want to parse this
my $extension_data = substr($self->data, $ptr);
if (length($extension_data) != $extensions_len) {
die "Invalid extension length\n";
}
my %extensions = ();
while (length($extension_data) >= 4) {
my ($type, $size) = unpack("nn", $extension_data);
my $extdata = substr($extension_data, 4, $size);
$extension_data = substr($extension_data, 4 + $size);
$extensions{$type} = $extdata;
}
$self->server_version($server_version);
$self->random($random);
$self->session_id_len($session_id_len);
$self->session($session);
$self->ciphersuite($ciphersuite);
$self->comp_meth($comp_meth);
$self->extensions_len($extensions_len);
$self->extension_data(\%extensions);
$self->process_data();
print " Server Version:".$server_version."\n";
print " Session ID Len:".$session_id_len."\n";
print " Ciphersuite:".$ciphersuite."\n";
print " Compression Method:".$comp_meth."\n";
print " Extensions Len:".$extensions_len."\n";
}
#Perform any actions necessary based on the data we've seen
sub process_data
{
my $self = shift;
TLSProxy::Message->ciphersuite($self->ciphersuite);
}
#Reconstruct the on-the-wire message data following changes
sub set_message_contents
{
my $self = shift;
my $data;
$data = pack('n', $self->server_version);
$data .= $self->random;
$data .= pack('C', $self->session_id_len);
$data .= $self->session;
$data .= pack('n', $self->ciphersuite);
$data .= pack('C', $self->comp_meth);
$data .= pack('n', $self->extensions_len);
foreach my $key (keys %{$self->extension_data}) {
my $extdata = ${$self->extension_data}{$key};
$data .= pack("n", $key);
$data .= pack("n", length($extdata));
$data .= $extdata;
}
$self->data($data);
}
#Read/write accessors
sub server_version
{
my $self = shift;
if (@_) {
$self->{client_version} = shift;
}
return $self->{client_version};
}
sub random
{
my $self = shift;
if (@_) {
$self->{random} = shift;
}
return $self->{random};
}
sub session_id_len
{
my $self = shift;
if (@_) {
$self->{session_id_len} = shift;
}
return $self->{session_id_len};
}
sub session
{
my $self = shift;
if (@_) {
$self->{session} = shift;
}
return $self->{session};
}
sub ciphersuite
{
my $self = shift;
if (@_) {
$self->{ciphersuite} = shift;
}
return $self->{ciphersuite};
}
sub comp_meth
{
my $self = shift;
if (@_) {
$self->{comp_meth} = shift;
}
return $self->{comp_meth};
}
sub extensions_len
{
my $self = shift;
if (@_) {
$self->{extensions_len} = shift;
}
return $self->{extensions_len};
}
sub extension_data
{
my $self = shift;
if (@_) {
$self->{extension_data} = shift;
}
return $self->{extension_data};
}
1;

176
util/TLSProxy/ServerKeyExchange.pm Normal file
View File

@ -0,0 +1,176 @@
# Written by Matt Caswell for the OpenSSL project.
# ====================================================================
# Copyright (c) 1998-2015 The OpenSSL Project. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
#
# 3. All advertising materials mentioning features or use of this
# software must display the following acknowledgment:
# "This product includes software developed by the OpenSSL Project
# for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
#
# 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
# endorse or promote products derived from this software without
# prior written permission. For written permission, please contact
# openssl-core@openssl.org.
#
# 5. Products derived from this software may not be called "OpenSSL"
# nor may "OpenSSL" appear in their names without prior written
# permission of the OpenSSL Project.
#
# 6. Redistributions of any form whatsoever must retain the following
# acknowledgment:
# "This product includes software developed by the OpenSSL Project
# for use in the OpenSSL Toolkit (http://www.openssl.org/)"
#
# THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
# EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
# ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
# OF THE POSSIBILITY OF SUCH DAMAGE.
# ====================================================================
#
# This product includes cryptographic software written by Eric Young
# (eay@cryptsoft.com). This product includes software written by Tim
# Hudson (tjh@cryptsoft.com).
use strict;
package TLSProxy::ServerKeyExchange;
use parent 'TLSProxy::Message';
sub new
{
my $class = shift;
my ($server,
$data,
$records,
$startoffset,
$message_frag_lens) = @_;
my $self = $class->SUPER::new(
$server,
TLSProxy::Message::MT_SERVER_KEY_EXCHANGE,
$data,
$records,
$startoffset,
$message_frag_lens);
#DHE
$self->{p} = "";
$self->{g} = "";
$self->{pub_key} = "";
$self->{sig} = "";
return $self;
}
sub parse
{
my $self = shift;
#Minimal SKE parsing. Only supports DHE at the moment (if its not DHE
#the parsing data will be trash...which is ok as long as we don't try to
#use it)
my $p_len = unpack('n', $self->data);
my $ptr = 2;
my $p = substr($self->data, $ptr, $p_len);
$ptr += $p_len;
my $g_len = unpack('n', substr($self->data, $ptr));
$ptr += 2;
my $g = substr($self->data, $ptr, $g_len);
$ptr += $g_len;
my $pub_key_len = unpack('n', substr($self->data, $ptr));
$ptr += 2;
my $pub_key = substr($self->data, $ptr, $pub_key_len);
$ptr += $g_len;
#We assume its signed
my $sig_len = unpack('n', substr($self->data, $ptr));
$ptr += 2;
my $sig = substr($self->data, $ptr, $sig_len);
$ptr += $sig_len;
$self->p($p);
$self->g($g);
$self->pub_key($pub_key);
$self->sig($sig);
}
#Reconstruct the on-the-wire message data following changes
sub set_message_contents
{
my $self = shift;
my $data;
$data = pack('n', length($self->p));
$data .= $self->p;
$data .= pack('n', length($self->g));
$data .= $self->g;
$data .= pack('n', length($self->pub_key));
$data .= $self->pub_key;
if (length($self->sig) > 0) {
$data .= pack('n', length($self->sig));
$data .= $self->sig;
}
$self->data($data);
}
#Read/write accessors
#DHE
sub p
{
my $self = shift;
if (@_) {
$self->{p} = shift;
}
return $self->{p};
}
sub g
{
my $self = shift;
if (@_) {
$self->{g} = shift;
}
return $self->{g};
}
sub pub_key
{
my $self = shift;
if (@_) {
$self->{pub_key} = shift;
}
return $self->{pub_key};
}
sub sig
{
my $self = shift;
if (@_) {
$self->{sig} = shift;
}
return $self->{sig};
}
1;