virtual-ldap/bin/ldap-rewrite.pl

#!/usr/bin/perl
# Copyright (c) 2006 Hans Klunder <hans.klunder@bigfoot.com>. All rights reserved.
# This program is free software; you can redistribute it and/or
# modify it under the same terms as Perl itself.

# It's modified by Dobrica Pavlinusic <dpavlin@rot13.org> to include following:
#
# * rewrite LDAP bind request cn: username@domain.com -> uid=username,dc=domain,dc=com
# * rewrite search responses:
# ** expand key:value pairs from hrEduPersonUniqueNumber into hrEduPersonUniqueNumber_key
# ** augment response with yaml/dn.yaml data (for external data import)

use strict;
use warnings;

use IO::Select;
use IO::Socket;
use IO::Socket::SSL;
use warnings;
use Data::Dump qw/dump/;
use Convert::ASN1 qw(asn_read);
use Net::LDAP::ASN qw(LDAPRequest LDAPResponse);
our $VERSION = '0.3';
use fields qw(socket target);
use YAML qw/LoadFile/;

my $debug = 1;

my $config = {
        yaml_dir => './yaml/',
        listen => shift @ARGV || 'localhost:1389',
        upstream_ldap => 'ldap.ffzg.hr',
        upstream_ssl => 1,
        overlay_prefix => 'ffzg-',
#       log_file => 'log/ldap-rewrite.log',

};

my $log_fh;

sub log {
        return unless $config->{log_file};

        if ( ! $log_fh ) {
                open($log_fh, '>>', $config->{log_file}) || die "can't open ", $config->{log_file},": $!";
                print $log_fh "# " . time;
        }
        $log_fh->autoflush(1);
        print $log_fh join("\n", @_),"\n";
}

BEGIN {
        $SIG{'__WARN__'} = sub { warn @_; main::log(@_); }
}


if ( ! -d $config->{yaml_dir} ) {
        warn "DISABLE ", $config->{yaml_dir}," data overlay";
}

warn "# config = ",dump( $config );

sub handle {
        my $clientsocket=shift;
        my $serversocket=shift;

        # read from client
        asn_read($clientsocket, my $reqpdu);
        if ( ! $reqpdu ) {
                warn "WARNING no reqpdu\n";
                return 1;
        }
        $reqpdu = log_request($reqpdu);

        # send to server
        print $serversocket $reqpdu or die "Could not send PDU to server\n ";
        
        # read from server
        my $ready;
        my $sel = IO::Select->new($serversocket);
        for( $ready = 1 ; $ready ; $ready = $sel->can_read(0)) {
                asn_read($serversocket, my $respdu) or return 1;
                $respdu = log_response($respdu);
                # and send the result to the client
                print $clientsocket $respdu;
        }

        return 0;
}


sub log_request {
        my $pdu=shift;

#       print '-' x 80,"\n";
#       print "Request ASN 1:\n";
#       Convert::ASN1::asn_hexdump(\*STDOUT,$pdu);
#       print "Request Perl:\n";
        my $request = $LDAPRequest->decode($pdu);
        warn "## request = ",dump($request);

        if ( defined $request->{bindRequest} ) {
                if ( $request->{bindRequest}->{name} =~ m{@} ) {
                        my $old = $request->{bindRequest}->{name};
                        $request->{bindRequest}->{name} =~ s/[@\.]/,dc=/g;
                        $request->{bindRequest}->{name} =~ s/^/uid=/;
                        warn "rewrite bind cn $old -> ", $request->{bindRequest}->{name};
                        Convert::ASN1::asn_hexdump(\*STDOUT,$pdu) if $debug;
                        $pdu = $LDAPRequest->encode($request);
                        Convert::ASN1::asn_hexdump(\*STDOUT,$pdu) if $debug;
                }
        }

        return $pdu;
}

sub log_response {
        my $pdu=shift;

#       print '-' x 80,"\n";
#       print "Response ASN 1:\n";
#       Convert::ASN1::asn_hexdump(\*STDOUT,$pdu);
#       print "Response Perl:\n";
        my $response = $LDAPResponse->decode($pdu);

        if ( defined $response->{protocolOp}->{searchResEntry} ) {
                my $uid = $response->{protocolOp}->{searchResEntry}->{objectName};
                warn "## objectName $uid";

                my @attrs;

                map {
                        if ( $_->{type} eq 'hrEduPersonUniqueNumber' ) {
                                foreach my $val ( @{ $_->{vals} } ) {
                                        next if $val !~ m{.+:.+};
                                        my ( $n, $v ) = split(/\s*:\s*/, $val );
                                        push @attrs, { type => $_->{type} . '_' . $n, vals => [ $v ] };
                                }
                        }
                } @{ $response->{protocolOp}->{searchResEntry}->{attributes} };

                warn "# ++ attrs ",dump( @attrs );

                push @{ $response->{protocolOp}->{searchResEntry}->{attributes} }, $_ foreach @attrs;

                my $path = $config->{yaml_dir} . "$uid.yaml";
                if ( -e $path ) {
                        my $data = LoadFile($path);
                        warn "# yaml = ",dump($data);

                        foreach my $type ( keys %$data ) {

                                my $vals = $data->{$type};

                                push @{ $response->{protocolOp}->{searchResEntry}->{attributes} }, {
                                        type => $config->{overlay_prefix} . $type,
                                        vals => ref($vals) eq 'ARRAY' ? $vals : [ $vals ],
                                };
                        }
                }

                $pdu = $LDAPResponse->encode($response);
        }

        warn "## response = ", dump($response);

        return $pdu;
}

sub run_proxy {
        my $listenersock = shift;
        my $targetsock=shift;

        die "Could not create listener socket: $!\n" unless $listenersock;
        die "Could not create connection to server: $!\n" unless $targetsock;

        my $sel = IO::Select->new($listenersock);
        my %Handlers;
        while (my @ready = $sel->can_read) {
                foreach my $fh (@ready) {
                        if ($fh == $listenersock) {
                                # let's create a new socket
                                my $psock = $listenersock->accept;
                                $sel->add($psock);
                        } else {
                                my $result = handle($fh,$targetsock);
                                if ($result) {
                                        # we have finished with the socket
                                        $sel->remove($fh);
                                        $fh->close;
                                        delete $Handlers{*$fh};
                                }
                        }
                }
        }
}


my $listenersock = IO::Socket::INET->new(
        Listen => 5,
        Proto => 'tcp',
        Reuse => 1,
        LocalAddr => $config->{listen},
) || die "can't open listen socket: $!";


my $targetsock = $config->{upstream_ssl}
        ? IO::Socket::INET->new(
                Proto => 'tcp',
                PeerAddr => $config->{upstream_ldap},
                PeerPort => 389,
        )
        : IO::Socket::SSL->new( $config->{upstream_ldap} . ':ldaps')
        || die "can't open upstream socket: $!";

run_proxy($listenersock,$targetsock);

1;
1	dpavlin	8	#!/usr/bin/perl
2			# Copyright (c) 2006 Hans Klunder <hans.klunder@bigfoot.com>. All rights reserved.
3			# This program is free software; you can redistribute it and/or
4			# modify it under the same terms as Perl itself.
5
6	dpavlin	61	# It's modified by Dobrica Pavlinusic <dpavlin@rot13.org> to include following:
7			#
8			# * rewrite LDAP bind request cn: username@domain.com -> uid=username,dc=domain,dc=com
9			# * rewrite search responses:
10			# ** expand key:value pairs from hrEduPersonUniqueNumber into hrEduPersonUniqueNumber_key
11			# ** augment response with yaml/dn.yaml data (for external data import)
12	dpavlin	8
13			use strict;
14			use warnings;
15
16			use IO::Select;
17			use IO::Socket;
18	dpavlin	16	use IO::Socket::SSL;
19	dpavlin	8	use warnings;
20			use Data::Dump qw/dump/;
21			use Convert::ASN1 qw(asn_read);
22			use Net::LDAP::ASN qw(LDAPRequest LDAPResponse);
23	dpavlin	61	our $VERSION = '0.3';
24	dpavlin	8	use fields qw(socket target);
25	dpavlin	10	use YAML qw/LoadFile/;
26	dpavlin	8
27	dpavlin	61	my $debug = 1;
28
29	dpavlin	18	my $config = {
30			yaml_dir => './yaml/',
31	dpavlin	37	listen => shift @ARGV \|\| 'localhost:1389',
32	dpavlin	18	upstream_ldap => 'ldap.ffzg.hr',
33			upstream_ssl => 1,
34			overlay_prefix => 'ffzg-',
35	dpavlin	66	# log_file => 'log/ldap-rewrite.log',
36	dpavlin	18
37			};
38
39	dpavlin	27	my $log_fh;
40
41			sub log {
42	dpavlin	66	return unless $config->{log_file};
43
44	dpavlin	28	if ( ! $log_fh ) {
45			open($log_fh, '>>', $config->{log_file}) \|\| die "can't open ", $config->{log_file},": $!";
46			print $log_fh "# " . time;
47			}
48	dpavlin	27	$log_fh->autoflush(1);
49			print $log_fh join("\n", @_),"\n";
50			}
51
52			BEGIN {
53			$SIG{'__WARN__'} = sub { warn @_; main::log(@_); }
54			}
55
56
57	dpavlin	18	if ( ! -d $config->{yaml_dir} ) {
58			warn "DISABLE ", $config->{yaml_dir}," data overlay";
59			}
60
61			warn "# config = ",dump( $config );
62
63	dpavlin	8	sub handle {
64			my $clientsocket=shift;
65			my $serversocket=shift;
66
67			# read from client
68			asn_read($clientsocket, my $reqpdu);
69	dpavlin	61	if ( ! $reqpdu ) {
70			warn "WARNING no reqpdu\n";
71			return 1;
72			}
73			$reqpdu = log_request($reqpdu);
74	dpavlin	8
75			# send to server
76			print $serversocket $reqpdu or die "Could not send PDU to server\n ";
77
78			# read from server
79			my $ready;
80			my $sel = IO::Select->new($serversocket);
81			for( $ready = 1 ; $ready ; $ready = $sel->can_read(0)) {
82			asn_read($serversocket, my $respdu) or return 1;
83			$respdu = log_response($respdu);
84			# and send the result to the client
85			print $clientsocket $respdu;
86			}
87
88			return 0;
89			}
90
91
92			sub log_request {
93			my $pdu=shift;
94
95	dpavlin	28	# print '-' x 80,"\n";
96			# print "Request ASN 1:\n";
97			# Convert::ASN1::asn_hexdump(\*STDOUT,$pdu);
98			# print "Request Perl:\n";
99	dpavlin	8	my $request = $LDAPRequest->decode($pdu);
100	dpavlin	28	warn "## request = ",dump($request);
101	dpavlin	61
102			if ( defined $request->{bindRequest} ) {
103			if ( $request->{bindRequest}->{name} =~ m{@} ) {
104			my $old = $request->{bindRequest}->{name};
105			$request->{bindRequest}->{name} =~ s/[@\.]/,dc=/g;
106			$request->{bindRequest}->{name} =~ s/^/uid=/;
107			warn "rewrite bind cn $old -> ", $request->{bindRequest}->{name};
108			Convert::ASN1::asn_hexdump(\*STDOUT,$pdu) if $debug;
109			$pdu = $LDAPRequest->encode($request);
110			Convert::ASN1::asn_hexdump(\*STDOUT,$pdu) if $debug;
111			}
112			}
113
114			return $pdu;
115	dpavlin	8	}
116
117			sub log_response {
118			my $pdu=shift;
119
120	dpavlin	28	# print '-' x 80,"\n";
121			# print "Response ASN 1:\n";
122			# Convert::ASN1::asn_hexdump(\*STDOUT,$pdu);
123			# print "Response Perl:\n";
124	dpavlin	8	my $response = $LDAPResponse->decode($pdu);
125
126			if ( defined $response->{protocolOp}->{searchResEntry} ) {
127			my $uid = $response->{protocolOp}->{searchResEntry}->{objectName};
128	dpavlin	37	warn "## objectName $uid";
129	dpavlin	10
130	dpavlin	19	my @attrs;
131
132	dpavlin	8	map {
133	dpavlin	19	if ( $_->{type} eq 'hrEduPersonUniqueNumber' ) {
134			foreach my $val ( @{ $_->{vals} } ) {
135			next if $val !~ m{.+:.+};
136			my ( $n, $v ) = split(/\s:\s/, $val );
137			push @attrs, { type => $_->{type} . '_' . $n, vals => [ $v ] };
138			}
139	dpavlin	8	}
140			} @{ $response->{protocolOp}->{searchResEntry}->{attributes} };
141
142	dpavlin	19	warn "# ++ attrs ",dump( @attrs );
143
144			push @{ $response->{protocolOp}->{searchResEntry}->{attributes} }, $_ foreach @attrs;
145
146	dpavlin	18	my $path = $config->{yaml_dir} . "$uid.yaml";
147	dpavlin	10	if ( -e $path ) {
148			my $data = LoadFile($path);
149			warn "# yaml = ",dump($data);
150	dpavlin	8
151	dpavlin	10	foreach my $type ( keys %$data ) {
152
153			my $vals = $data->{$type};
154
155	dpavlin	22	push @{ $response->{protocolOp}->{searchResEntry}->{attributes} }, {
156			type => $config->{overlay_prefix} . $type,
157			vals => ref($vals) eq 'ARRAY' ? $vals : [ $vals ],
158			};
159	dpavlin	10	}
160			}
161
162	dpavlin	8	$pdu = $LDAPResponse->encode($response);
163			}
164
165	dpavlin	28	warn "## response = ", dump($response);
166	dpavlin	10
167	dpavlin	8	return $pdu;
168			}
169
170			sub run_proxy {
171			my $listenersock = shift;
172			my $targetsock=shift;
173
174			die "Could not create listener socket: $!\n" unless $listenersock;
175			die "Could not create connection to server: $!\n" unless $targetsock;
176
177			my $sel = IO::Select->new($listenersock);
178			my %Handlers;
179			while (my @ready = $sel->can_read) {
180			foreach my $fh (@ready) {
181			if ($fh == $listenersock) {
182			# let's create a new socket
183			my $psock = $listenersock->accept;
184			$sel->add($psock);
185			} else {
186			my $result = handle($fh,$targetsock);
187			if ($result) {
188			# we have finished with the socket
189			$sel->remove($fh);
190			$fh->close;
191			delete $Handlers{*$fh};
192			}
193			}
194			}
195			}
196			}
197
198
199			my $listenersock = IO::Socket::INET->new(
200			Listen => 5,
201			Proto => 'tcp',
202			Reuse => 1,
203	dpavlin	18	LocalAddr => $config->{listen},
204	dpavlin	29	) \|\| die "can't open listen socket: $!";
205	dpavlin	8
206
207	dpavlin	18	my $targetsock = $config->{upstream_ssl}
208			? IO::Socket::INET->new(
209			Proto => 'tcp',
210			PeerAddr => $config->{upstream_ldap},
211			PeerPort => 389,
212			)
213			: IO::Socket::SSL->new( $config->{upstream_ldap} . ':ldaps')
214	dpavlin	29	\|\| die "can't open upstream socket: $!";
215	dpavlin	8
216			run_proxy($listenersock,$targetsock);
217
218			1;