NAME

POE::Component::SSLify::NonBlock - Makes using SSL in the world of POE nonblocking and the capability to authenticate client certificates !

SYNOPSIS

Server-side usage

        # Import the modules
        use POE::Component::SSLify qw( SSLify_Options SSLify_GetCTX );
        use POE::Component::SSLify::NonBlock qw( Server_SSLify_NonBlock );

        # Set the key + certificate file
        eval { SSLify_Options( 'server.key', 'server.crt' ) };
        if ( $@ ) {
                # Unable to load key or certificate file...
        }

        # Create a normal SocketFactory wheel or something
        my $factory = POE::Wheel::SocketFactory->new( ... );

        # Converts the socket into a SSL socket POE can communicate with
        eval { $socket = Server_SSLify_NonBlock( SSLify_GetCTX(), $socket, { } ) };
        if ( $@ ) {
                # Unable to SSLify it...
        }

        # Now, hand it off to ReadWrite
        my $rw = POE::Wheel::ReadWrite->new(
                Handle  =>      $socket,
                ...
        );

ABSTRACT

Makes SSL use in POE in non-blocking mode and the capability to authenticate client certificates !

DESCRIPTION

This component represents the the common way of using ssl on a server, which needs to ensure that not one client can block the whole server. Further it allows to authenticate client certificates.

Non-Blocking needed, espacially on client certification authentication

SSL is a protocol which interacts with the client during the handshake multiple times. If the socket is blocking, as on pure POE::Component::SSLify, one client can block the whole server. Especially if you want to make client certificate authentication, the user has the abilty to choose a client certificate. In this situation the ssl handshake is waiting, and in blocked mode the whole server also stops responding.

Client certificate authentication

You have three opportunities to do client certificate authentication:

  Easiest way: 
    Proof the certificate and let OpenSSL reject the connection during ssl handshake if there is no certificate or it is unstrusted.

  Advanced way:
    Proof the certificate and poe handler determines if there is no certificate or it is unstrusted.

  Complicated way:
    Proof the certificate and poe handler determines if there is no certificate, it is unstrusted or it is blocked by a CRL.

Easiest way: Client certificat rejection in ssl handshake

Generaly you can use the "Server-side usage" example above, but you have to enable the client certification feature with the "clientcertrequest" paramter. The Server_SSLify_NonBlock function allows a hash for parameters:

   eval { $heap->{socket} = Server_SSLify_NonBlock(SSLify_GetCTX(), $heap->{socket}, {
      clientcertrequest => 1
   } ) };
   if ( $@ ) {
      print "SSL Failed: ".$@."\n";
      delete $heap->{wheel_client};
   }

Now the server sends during SSL handshake the request for a client certificate. By default, POE::Component::SSLify::NonBlock aborts the connection if "clientcertrequest" is set and there is no client certificat or the certificate is not trusted.

Advanced way: Client certificat reject in POE Handler

   eval { SSLify_Options( 'server.key', 'server.crt' ) };
   if ( $@ ) {
      # Unable to load key or certificate file...
   }
   eval { SSLify_Options_NonBlock_ClientCert(SSLify_GetCTX(), 'ca.crt')) };
   if ( $@ ) {
      # Unable to load certificate file...
   }   
   eval { $heap->{socket} = Server_SSLify_NonBlock( SSLify_GetCTX(), $socket, {
      clientcertrequest => 1,
      noblockbadclientcert => 1
   } ) };
   if ( $@ ) {
      print "SSL Failed: ".$@."\n";
      delete $heap->{wheel_client};
   }
   $heap->{wheel_client} = POE::Wheel::ReadWrite->new(
      Handle     => $heap->{socket},
      Driver     => POE::Driver::SysRW->new,
      Filter     => POE::Filter::Stream->new,
      InputEvent => 'client_input',
      ...
   }
   client_input => sub {
      my ( $heap, $kernel, $input ) = @_[ HEAP, KERNEL, ARG0 ];
      return unless Server_SSLify_NonBlock_SSLDone($heap->{socket});
      if (!(Server_SSLify_NonBlock_ClientCertificateExists($heap->{socket}))) {
         exists $heap->{wheel_client} &&
           (ref($heap->{wheel_client}) eq "POE::Wheel::ReadWrite") &&
                $heap->{wheel_client}->put("HTTP/1.1 200 Found\r\nContent-type: text/html\r\n\r\nNoClientCertExists");
         $kernel->yield("disconnect");
         return;
      } elsif(!(Server_SSLify_NonBlock_ClientCertIsValid($heap->{socket}))) {
         exists $heap->{wheel_client} &&
           (ref($heap->{wheel_client}) eq "POE::Wheel::ReadWrite") &&
                $heap->{wheel_client}->put("Content-type: text/html\r\n\r\nClientCertInvalid");
         $kernel->yield("disconnect");
         return;
      }
      ...
   },
   disconnect => sub { $_[KERNEL]->delay(close_delayed => 1) unless ($_[HEAP]->{disconnecting}++); },
   close_delayed => sub {
      my ($kernel, $heap) = @_[KERNEL, HEAP];
      delete $heap->{wheel_client};
   },
   ...

Complicated way: Client certificat reject in POE Handler with CRL support

WARNING: For this to work you have to patch into Net::SSLeay the lines in the file net-ssleay-patch, and then recompile and reinstall the Net::SSLeay package.

   eval { SSLify_Options( 'server.key', 'server.crt' ) };
   if ( $@ ) {
      # Unable to load key or certificate file...
   }
   eval { SSLify_Options_NonBlock_ClientCert(SSLify_GetCTX(), 'ca.crt')) };
   if ( $@ ) {
      # Unable to load certificate file...
   }   
   eval { $heap->{socket} = Server_SSLify_NonBlock( SSLify_GetCTX(), $socket, {
      clientcertrequest => 1,
      noblockbadclientcert => 1,
      getserial => 1
   } ) };
   if ( $@ ) {
      print "SSL Failed: ".$@."\n";
      delete $heap->{wheel_client};
   }
   $heap->{wheel_client} = POE::Wheel::ReadWrite->new(
      Handle     => $heap->{socket},
      Driver     => POE::Driver::SysRW->new,
      Filter     => POE::Filter::Stream->new,
      InputEvent => 'client_input',
      ...
   }
   client_input => sub {
      my ( $heap, $kernel, $input ) = @_[ HEAP, KERNEL, ARG0 ];
      return unless Server_SSLify_NonBlock_SSLDone($heap->{socket});
      if (!(Server_SSLify_NonBlock_ClientCertificateExists($heap->{socket}))) {
         exists $heap->{wheel_client} &&
           (ref($heap->{wheel_client}) eq "POE::Wheel::ReadWrite") &&
                $heap->{wheel_client}->put("HTTP/1.1 200 Found\r\nContent-type: text/html\r\n\r\nNoClientCertExists");
         $kernel->yield("disconnect");
         return;
      } elsif(!(Server_SSLify_NonBlock_ClientCertIsValid($heap->{socket}))) {
         exists $heap->{wheel_client} &&
           (ref($heap->{wheel_client}) eq "POE::Wheel::ReadWrite") &&
                $heap->{wheel_client}->put("Content-type: text/html\r\n\r\nClientCertInvalid");
         $kernel->yield("disconnect");
         return;
      } elsif(!(Server_SSLify_NonBlock_ClientCertProofeAgainstCRL($heap->{socket}, 'ca.crl'))) {
         exists $heap->{wheel_client} &&
           (ref($heap->{wheel_client}) eq "POE::Wheel::ReadWrite") &&
                $heap->{wheel_client}->put("Content-type: text/html\r\n\r\nCRL");
         $kernel->yield("disconnect");
         return;
      }
      ...
   },
   disconnect => sub { $_[KERNEL]->delay(close_delayed => 1) unless ($_[HEAP]->{disconnecting}++); },
   close_delayed => sub {
      my ($kernel, $heap) = @_[KERNEL, HEAP];
      delete $heap->{wheel_client};
   },
   ...

NOTES

Based on POE::Component::SSLify

This module is based on POE::Component::SSLify, so we have here the same issues as on POE::Component::SSLify.

FUNCTIONS

Server_SSLify_NonBlock($ctx, $socket, %$options)

Same as for Server_SSLify from POE::Component::SSLify, but with the CTX of POE::Component::SSLify and a hash for special options:

   my $socket = shift;  # get the socket from somewhere
   $socket = Server_SSLify_NonBlock(SSLify_GetCTX(), $socket, { option1 => 1, option1 => 2,... });

Options are:

   clientcertrequest
      The client is requested for a client certificat ssl handshake

   noblockbadclientcert
      If the client don't provide a client certificate, or the
      client certificate is untrusted, the connection will not
      be aborted. You can check for the errors via the functions
      Server_SSLify_NonBlock_ClientCertificateExists and
      Server_SSLify_NonBlock_ClientCertIsValid.

   debug
      Get debug messages during ssl handshake.

   getserial
      Request the serial of the client certificate during
      ssl handshake.
      
      WARNING: You have to patch Net::SSLeay to provide the
               Net::SSLeay::X509_get_serialNumber function
               before you can set the getserial option! See the
               file net-ssleay-patch.

Note:

   SSLify_Options from POE::Component::SSLify must be set first!

SSLify_Options_NonBlock_ClientCert($ctx, $cacrt)

Configures ssl ctx(context) to request from a certificate from client which is authenticated against the configured CA in file $cacrt.

   SSLify_Options_NonBlock_ClientCert(SSLify_GetCTX(), 'ca.crt');

Note:

   SSLify_Options from POE::Component::SSLify must be set first!

Server_SSLify_NonBlock_ClientCertificateExists($socket)

Proofes if the client commited a valid client certificate.

  Server_SSLify_NonBlock_ClientCertificateExists($socket);

Server_SSLify_NonBlock_ClientCertIsValid($socket)

Proofes if the client certifcate is trusted by a loaded CA (see SSLify_Options_NonBlock_ClientCert).

  Server_SSLify_NonBlock_ClientCertIsValid($socket);

Server_SSLify_NonBlock_ClientCertProofeAgainstCRL($socket, $crlfile)

Open a CRL file, and proofes if the serial of the client certificate is contained in the CRL file. No file caching is done, each run the file is new opened.

  Server_SSLify_NonBlock_ClientCertProofeAgainstCRL($socket, 'ca.crl');
  
   WARNING: You have to patch Net::SSLeay to provide the
            Net::SSLeay::verify_serial_against_crl_file function
            before you can set the getserial option! See the
            file net-ssleay-patch.

Futher functions...

You can use all functions from POE::Component::SSLify !

EXPORT

Stuffs all of the above functions in @EXPORT_OK so you have to request them directly

BUGS

Server_SSLify_NonBlock_ClientCertProofeAgainstCRL: certificate serials

Server_SSLify_NonBlock_ClientCertProofeAgainstCRL also proofes against the serial of the CA ! Make sure that you never use the serial of the CA for client certificates!

Win32

I didn't test this on the Win32 platforms at all!

AUTHOR

pRiVi <pRiVi@cpan.org>

PROPS

This code is based on Apocalypse module POE::Component::SSLify, improved by client certification code and non-blocking sockets.

COPYRIGHT AND LICENSE

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

To install POE::Component::SSLify::NonBlock, copy and paste the appropriate command in to your terminal.

cpanm

cpanm POE::Component::SSLify::NonBlock

CPAN shell

perl -MCPAN -e shell
install POE::Component::SSLify::NonBlock

For more information on module installation, please visit the detailed CPAN module installation guide.

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