Provided by: libpoe-filter-ssl-perl_0.41-1_amd64 
NAME
POE::Filter::SSL - The easiest and flexiblest way to SSL in POE!
VERSION
Version 0.41
DESCRIPTION
This module allows one to secure connections of POE::Wheel::ReadWrite with OpenSSL by a POE::Filter
object, and behaves (beside of SSLing) as POE::Filter::Stream.
POE::Filter::SSL can be added, switched and removed during runtime, for example if you want to initiate
SSL (see the SSL on an established connection example in SYNOPSIS) on an already established connection.
You are able to combine POE::Filter::SSL with other filters, for example have a HTTPS server together
with POE::Filter::HTTPD (see the HTTPS-Server example in SYNOPSIS).
POE::Filter::SSL is based on Net::SSLeay, but got two XS functions which Net::SSLeay is missing.
Features
Full non-blocking processing
No use of sockets at all
Server and client mode
Optional client certificate verification
Allows one to accept connections with invalid or missing client certificate and return custom error
data
CRL check of client certificates
Retrieve client certificate details (subject name, issuer name, certificate serial)
Upcoming Features
Direct cipher encryption without SSL or TLS protocol, for example with static AES encryption
SYNOPSIS
By default POE::Filter::SSL acts as a SSL server. To use it in client mode you just have to set the
client option of new().
TCP-Client
#!perl
use warnings;
use strict;
use POE qw(Component::Client::TCP Filter::SSL);
POE::Component::Client::TCP->new(
RemoteAddress => "yahoo.com",
RemotePort => 443,
Filter => [ "POE::Filter::SSL", client => 1 ],
Connected => sub {
$_[HEAP]{server}->put("HEAD /\r\n\r\n");
},
ServerInput => sub {
print "from server: ".$_[ARG0]."\n";
},
);
POE::Kernel->run();
exit;
TCP-Server
#!perl
use warnings;
use strict;
use POE qw(Component::Server::TCP);
POE::Component::Server::TCP->new(
Port => 443,
ClientFilter => [ "POE::Filter::SSL", crt => 'server.crt', key => 'server.key' ],
ClientConnected => sub {
print "got a connection from $_[HEAP]{remote_ip}\n";
$_[HEAP]{client}->put("Smile from the server!\r\n");
},
Alias => "tcp",
ClientInput => sub {
my ($kernel, $session, $heap) = @_[KERNEL, SESSION, HEAP];
$_[HEAP]{client}->put("You sent:\r\n".$_[ARG0]);
$_[KERNEL]->yield("shutdown");
},
);
POE::Kernel->run;
exit;
HTTPS-Server
use POE::Filter::SSL::PreFilter
use POE::Filter::SSL;
use POE::Component::Server::HTTP;
use HTTP::Status;
my $aliases = POE::Component::Server::HTTP->new(
Port => 443,
ContentHandler => {
'/' => \&handler,
'/dir/' => sub { return; },
'/file' => sub { return; }
},
Headers => { Server => 'My Server' },
PreFilter => POE::Filter::SSL->new(
crt => 'server.crt',
key => 'server.key',
cacrt => 'ca.crt'
)
);
sub handler {
my ($request, $response) = @_;
$response->code(RC_OK);
$response->content("Hi, you fetched ". $request->uri);
return RC_OK;
}
POE::Kernel->run();
POE::Kernel->call($aliases->{httpd}, "shutdown");
# next line isn't really needed
POE::Kernel->call($aliases->{tcp}, "shutdown");
SSL on an established connection
Advanced Example
This example is an IMAP-Relay which forwards the connections to a IMAP server by username. It allows
one the unencrypted transfer on port 143, with the option of SSL on the established connection
(STARTTLS). On port 993 it allows one to do direct SSL.
Tested with Thunderbird version 3.0.5.
#!perl
use warnings;
use strict;
use POE qw(Component::Server::TCP Component::Client::TCP Filter::SSL Filter::Stream);
my $defaultImapServer = "not.existing.de";
my $usernameToImapServer = {
user1 => 'mailserver1.domain.de',
user2 => 'mailserver2.domain.de',
# ...
};
POE::Component::Server::TCP->new(
Port => 143,
ClientFilter => "POE::Filter::Stream",
ClientDisconnected => \&disconnect,
ClientConnected => \&connected,
ClientInput => \&handleInput,
InlineStates => {
send_stuff => \&send_stuff,
_child => \&child
}
);
POE::Component::Server::TCP->new(
Port => 993,
ClientFilter => [ "POE::Filter::SSL", crt => 'server.crt', key => 'server.key' ],
ClientConnected => \&connected,
ClientDisconnected => \&disconnect,
ClientInput => \&handleInput,
InlineStates => {
send_stuff => \&send_stuff,
_child => \&child
}
);
sub disconnect {
my ($kernel, $session, $heap) = @_[KERNEL, SESSION, HEAP];
logevent('server got disconnect', $session);
$kernel->post($heap->{client_id} => "shutdown");
}
sub connected {
my ($kernel, $session, $heap) = @_[KERNEL, SESSION, HEAP];
logevent("got a connection from ".$heap->{remote_ip}, $session);
$heap->{client}->put("* OK [CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL ACL2=UNION STARTTLS] IMAP Relay v0.1 ready.\r\n");
}
sub send_stuff {
my ($heap, $stuff, $session) = @_[HEAP, ARG0, SESSION];
logevent("-> ".length($stuff)." Bytes", $session);
(defined($heap->{client})) && (ref($heap->{client}) eq "POE::Wheel::ReadWrite") &&
$heap->{client}->put($stuff);
}
sub child {
my ($heap, $child_op, $child) = @_[HEAP, ARG0, ARG1];
if ($child_op eq "create") {
$heap->{client_id} = $child->ID;
}
}
sub handleInput {
my ($kernel, $session, $heap, $input) = @_[KERNEL, SESSION, HEAP, ARG0];
if($heap->{forwarding}) {
return $kernel->yield("shutdown") unless (defined($heap->{client_id}));
$kernel->post($heap->{client_id} => send_stuff => $input);
} elsif ($input =~ /^(\d+)\s+STARTTLS[\r\n]+/i) {
$_[HEAP]{client}->put($1." OK Begin SSL/TLS negotiation now.\r\n");
logevent("SSLing now...", $session);
$_[HEAP]{client}->set_filter(POE::Filter::SSL->new(crt => 'server.crt', key => 'server.key'));
} elsif ($input =~ /^(\d+)\s+CAPABILITY[\r\n]+/i) {
$_[HEAP]{client}->put("* CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL ACL2=UNION STARTTLS\r\n");
$_[HEAP]{client}->put($1." OK CAPABILITY completed\r\n");
} elsif ($input =~ /^(\d+)\s+login\s+\"(\S+)\"\s+\"(\S+)\"[\r\n]+/i) {
my $username = $2;
my $pass = $3;
logevent("login of user ".$username, $session);
spawn_client_side($username, $input);
$heap->{forwarding}++;
} else {
logevent("unknown command before login, disconnecting.", $session);
return $kernel->yield("shutdown");
}
}
sub spawn_client_side {
my $username = shift;
POE::Component::Client::TCP->new(
RemoteAddress => $usernameToImapServer->{$username} || $defaultImapServer,
RemotePort => 143,
Filter => "POE::Filter::Stream",
Started => sub {
$_[HEAP]->{server_id} = $_[SENDER]->ID;
$_[HEAP]->{buf} = $_[ARG0];
$_[HEAP]->{skip} = 0;
},
Connected => sub {
my ($heap, $session) = @_[HEAP, SESSION];
logevent('client connected', $session);
$heap->{server}->put($heap->{buf});
delete $heap->{buf};
},
ServerInput => sub {
my ($kernel, $heap, $session, $input) = @_[KERNEL, HEAP, SESSION, ARG0];
#logevent('client got input', $session, $input);
$kernel->post($heap->{server_id} => send_stuff => $input) if ($heap->{skip}++);
},
Disconnected => sub {
my ($kernel, $heap, $session) = @_[KERNEL, HEAP, SESSION];
logevent('client disconnected', $session);
$kernel->post($heap->{server_id} => 'shutdown');
},
InlineStates => {
send_stuff => sub {
my ($heap, $stuff, $session) = @_[HEAP, ARG0, SESSION];
logevent("<- ".length($stuff)." Bytes", $session);
(defined($heap->{server})) && (ref($heap->{server}) eq "POE::Wheel::ReadWrite") &&
$heap->{server}->put($stuff);
},
},
Args => [ shift ]
);
}
sub logevent {
my ($state, $session, $arg) = @_;
my $id = $session->ID();
print "session $id $state ";
print ": $arg" if (defined $arg);
print "\n";
}
POE::Kernel->run;
Client certificate verification
Advanced Example
The following example implements a HTTPS server with client certificate verification, which shows
details about the verified client certificate.
#!perl
use strict;
use warnings;
use Socket;
use POE qw(
Wheel::SocketFactory
Wheel::ReadWrite
Driver::SysRW
Filter::SSL
Filter::Stackable
Filter::HTTPD
);
POE::Session->create(
inline_states => {
_start => sub {
my $heap = $_[HEAP];
$heap->{listener} = POE::Wheel::SocketFactory->new(
BindAddress => '0.0.0.0',
BindPort => 443,
Reuse => 'yes',
SuccessEvent => 'socket_birth',
FailureEvent => '_stop',
);
},
_stop => sub {
delete $_[HEAP]->{listener};
},
socket_birth => sub {
my ($socket) = $_[ARG0];
POE::Session->create(
inline_states => {
_start => sub {
my ($heap, $kernel, $connected_socket, $address, $port) = @_[HEAP, KERNEL, ARG0, ARG1, ARG2];
$heap->{sslfilter} = POE::Filter::SSL->new(
crt => 'server.crt',
key => 'server.key',
cacrt => 'ca.crt',
cipher => 'DHE-RSA-AES256-GCM-SHA384:AES256-SHA',
#cacrl => 'ca.crl', # Uncomment this, if you have a CRL file.
debug => 1,
clientcert => 1
);
$heap->{socket_wheel} = POE::Wheel::ReadWrite->new(
Handle => $connected_socket,
Driver => POE::Driver::SysRW->new(),
Filter => POE::Filter::Stackable->new(Filters => [
$heap->{sslfilter},
POE::Filter::HTTPD->new()
]),
InputEvent => 'socket_input',
ErrorEvent => '_stop',
);
},
socket_input => sub {
my ($kernel, $heap, $buf) = @_[KERNEL, HEAP, ARG0];
my (@certid) = ($heap->{sslfilter}->clientCertIds());
my $content = '';
if ($heap->{sslfilter}->clientCertValid()) {
$content .= "Hello <font color=green>valid</font> client Certifcate:";
} else {
$content .= "None or <font color=red>invalid</font> client certificate:";
}
$content .= "<hr>";
foreach my $certid (@certid) {
$certid = $certid ? $certid->[0]."<br>".$certid->[1]."<br>SERIAL=".$heap->{sslfilter}->hexdump($certid->[2]) : 'No client certificate';
$content .= $certid."<hr>";
}
$content .= "Your URL was: ".$buf->uri."<hr>"
if (ref($buf) eq "HTTP::Request");
$content .= localtime(time());
my $response = HTTP::Response->new(200);
$response->push_header('Content-type', 'text/html');
$response->content($content);
$heap->{socket_wheel}->put($response);
$kernel->delay(_stop => 1);
},
_stop => sub {
delete $_[HEAP]->{socket_wheel};
}
},
args => [$socket],
);
}
}
);
$poe_kernel->run();
FUNCTIONS
new(option = value, option => value, option...)>
Returns a new POE::Filter::SSL object. It accepts the following options:
client
By default POE::Filter::SSL acts as a SSL server. To use it in client mode, you have to set this
option.
crt{mem}
The certificate file (.crt) for the server, a client certificate in client mode.
You are able to pass the already inmemory crt file as scalar via crtmem.
key{mem}
The key file (.key) of the certificate (see crt above).
You are able to pass the already inmemory key file as scalar via keymem.
cacrt{mem}
The ca certificate file (ca.crt), which is used to verificate the client certificates against a CA.
You can store multiple ca in one file, all of them gets imported.
You are able to pass the already inmemory cacrt file as scalar via cacrtmem or as an array ref of
scalars, if you have multiple ca.
caverifydepth
By default the ca verify depth is 5, you can override this via this option.
chain
Chain certificate, you need it for example for startssl.org which needs a intermedia certificates.
Here you can configure it. You can generate this the following way:
cat client.crt intermediate.crt ca.crt > chain.pem
In this case, you normalyly have no key and crt option. Currently it is not possible to pass this
inmemory, only by file.
cacrl
Configures a CRL (ca.crl) against the client certificate is verified by clientCertValid().
dhcert{mem}
If you want to enable perfect forward secrecy, here you can enable Diffie-Hellman. You just have to
create a dhparam file and there here the path to the path/to/FILENAME.pem where your Diffie-Hellman
(pem format) stays.
openssl dhparam -check -text -5 2048 -out path/to/FILENAME.pem
You are able to pass the already inmemory dhparam file as scalar(string) via dhcertmem.
clientcert
Only in server mode: Request during ssl handshake from the client a client certificate.
WARNING: If the client provides an untrusted or no client certificate, the connection is not
failing. You have to ask clientCertValid() if the certificate is valid!
sni
Allows one to set the SNI hostname indication in first packet of handshake. See
https://de.wikipedia.org/wiki/Server_Name_Indication
tls
Force in the handshake the use of tls, disables support for the obsolete SSL handshake.
tls1_2
Force in the handshake the use of tls in version 1.2, disables support for the obsolete SSL
handshake.
nohonor
By default, as server, POE::Filter:SSL sets the option SSL_OP_CIPHER_SERVER_PREFERENCE. For more
information you may google the pendant of apache SSLHonorCipherOrder.
To flip back to the old behaviour, not setting this option, you can set nohonor.
cipher
Specify which ciphers are allowed for the synchronous encrypted transfer of the data over the ssl
connection.
Example:
cipher => 'DHE-RSA-AES256-GCM-SHA384:AES256-SHA'
blockbadclientcert
Let OpenSSL deny the connection if there is no client certificate.
WARNING: If the client is listed in the CRL file or an invalid client certifiate has been sent, the
connection will be established! You have to ask clientCertValid() if you have the crl option set on
new(), otherwise to ask clientCertNotOnCRL() if the certificate is listed on your CRL file!
ignoreVerifyErrors
WARNING: Before using this option, you should be realy sure that you know what you are doing!
Specify to ignore specific errors on verifying the certificate chain: This is for example useful to
be able to fetch the time from via secure and trusted TLS connection. In this case, your time is
wrong, so must ignore time errors, which are 9: X509_V_ERR_CERT_NOT_YET_VALID (certificate is not
yet valid) and 10: X509_V_ERR_CERT_HAS_EXPIRED (certificate has expired).
The list of errors you can ignore can be found on the documentation:
<https://wiki.openssl.org/index.php/Manual:Verify(1)>
Example:
ignoreVerifyErrors => [ 9, 10, ]
handshakeDone(options)
Returns true if the handshake is done and all data for handshake has been written out. It accepts the
following options:
ignorebuf
Returns true if OpenSSL has established the connection, regardless if all data has been written
out. This is needed if you want to exchange the Filter of POE::Wheel::ReadWrite before the first
data comes in. This option have been only used by doHandshake() to be able to add new filters
before first cleartext data to be processed gets in.
clientCertNotOnCRL($file)
Verifies if the serial of the client certificate is not contained in the CRL $file. No file caching
is done, each call opens the file again.
WARNING: If your CRL file is missing, can not be opened is empty or has no blocked certificate at all
in it, then every call will get blocked!
clientCertIds()
Returns an array of every certificate found by OpenSSL. Each element is again a array. The first
element is the value of X509_get_subject_name, second is the value of X509_get_issuer_name and third
element is the serial of the certificate in binary form. You have to use split() and ord(), or the
hexdump() function, to convert it to a readable form.
Example:
my ($certid) = ($heap->{sslfilter}->clientCertIds());
$certid = $certid ? $certid->[0]."<br>".$certid->[1]."<br>SERIAL=".$heap->{sslfilter}->hexdump($certid->[2]) : 'No client certificate';
getCipher()
Returns the used cryptographic algorithm and length.
Example:
$sslfilter->getCipher()
clientCertValid()
Returns true if there is a client certificate that is valid. It also tests against the CRL, if you
have the cacrl option set on new().
doHandshake($readWrite, $filter, $filter, ...) !!!REMOVED!!!
WARNING: POE::Filter:SSL now is able to do the ssh handshake now without any helpers. Because of
this, this function has been removed!
Allows one to add filters after the ssl handshake. It has to be called in the input handler, and
needs the passing of the POE::Wheel::ReadWhile object. If it returns false, you have to return from
the input handler.
See the HTTPS-Server, SSL on an established connection and Client certificate verification examples
in SYNOPSIS
clientCertExists()
Returns true if there is a client certificate, that might be untrusted.
WARNING: If the client provides an untrusted client certificate a client certificate that is listed
in CRL, this function returns true. You have to ask clientCertValid() if the certificate is valid!
errorhandler
By default, every ssl error is escalated via carp. You may change this behaviour via this option to:
"ignore"
Do not report any error.
CODE
Setting errorhandler to a reference of a function allows one to be called it callback function with
the following options:
ARG1: POE:SSL::Filter instance
ARG2: Ref on a Hash with the following keys:
ret The return code of Net::SSLeay::connect (client) or Net::SSLeay::accept (server)
ssl The SSL context (SSL_CTX)
msg The error message as text, as normally reported via carp
get_error The error code of get_error the ssl context
error The error code of get_error without context
"carp" (or undef)
Do Carp/carp on error.
"confess"
Do Carp/confess (stacktrace) on error.
"carponetime"
Report carp for one occurrence only one time - over all!
debug
Shows debug messages of clientCertNotOnCRL().
hexdump($string)
Returns string data in hex format.
Example:
perl -e 'use POE::Filter::SSL; print POE::Filter::SSL->hexdump("test")."\n";'
74:65:73:74
Internal functions and POE::Filter handler
VERIFY()
POE_FILTER_X509_get_serialNumber()
POE_FILTER_SSL_CTX_set_tmp_dh()
POE_FILTER_SSL_CTX_set_tmp_rsa()
POE_FILTER_SSL_set_tmp_dh()
clone()
doSSL()
get()
get_one()
get_one_start()
get_pending()
writeToSSLBIO()
writeToSSL()
put()
verify_serial_against_crl_file()
DOSENDBACK()
checkForDoSendback()
CTX_add_client_CA()
PEMdataToEVP_PKEY
PEMdataToX509
dataToBio
AUTHOR
Markus Schraeder, "<privi at cpan.org>"
BUGS
Please report any bugs or feature requests to "bug-poe-filter-ssl at rt.cpan.org", or through the web
interface at <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=POE-Filter-SSL>. I will be notified, and
then you'll automatically be notified of progress on your bug as I make changes.
SUPPORT
You can find documentation for this module with the perldoc command.
perldoc POE::Filter::SSL
You can also look for information at:
• RT: CPAN's request tracker
<http://rt.cpan.org/NoAuth/Bugs.html?Dist=POE-Filter-SSL>
• AnnoCPAN: Annotated CPAN documentation
<http://annocpan.org/dist/POE-Filter-SSL>
• CPAN Ratings
<http://cpanratings.perl.org/d/POE-Filter-SSL>
• Search CPAN
<http://search.cpan.org/dist/POE-Filter-SSL>
Commercial support
Commercial support can be gained at <sslsupport at cryptomagic.eu>.
Used in our products, you can find on <https://www.cryptomagic.eu/>
COPYRIGHT & LICENSE
Copyright 2010-2017 Markus Schraeder, CryptoMagic GmbH, all rights reserved.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl
itself.