lib/LDAP/Virtual.pm

package LDAP::Virtual;

use strict;
use warnings;

use Net::LDAP::Constant qw(
        LDAP_SUCCESS
        LDAP_STRONG_AUTH_NOT_SUPPORTED
        LDAP_UNAVAILABLE
        LDAP_OPERATIONS_ERROR
);
use Net::LDAP::Server;
use Net::LDAP::Filter;
use base qw(Net::LDAP::Server);
use fields qw(upstream);

use Net::LDAP;

use URI::Escape;        # uri_escape
use IO::Socket::INET;
use IO::Select;

use Data::Dump qw/dump/;

=head1 NAME

LDAP::Virtual

=cut

=head1 DESCRIPTION

Provide LDAP server functionality somewhat similar to C<slapo-rwm>

=head1 METHODS

=head2 run

  my $pid = LDAP::Virtual->run({ port => 1389, fork => 0 });

=cut

our $pids;
our $cache;

sub cache {
        return $cache;
}

sub run {
        my $self = shift;

        my $args = shift;
        # default LDAP port
        my $port = $args->{port} ||= 1389;

        if ( $args->{fork} ) {
                defined(my $pid = fork()) or die "Can't fork: $!";
                if ( $pid ) {
                        $pids->{ $port } = $pid;
                        warn "# pids = ",dump( $pids );
                        sleep 1;
                        return $pid;
                }
        }

        my $sock = IO::Socket::INET->new(
                Listen => 5,
                Proto => 'tcp',
                Reuse => 1,
                LocalPort => $port,
        ) or die "can't listen on port $port: $!\n";

        warn "LDAP server listening on port $port\n";

        my $sel = IO::Select->new($sock) or die "can't select socket: $!\n";
        my %Handlers;
        while (my @ready = $sel->can_read) {
                foreach my $fh (@ready) {
                        if ($fh == $sock) {
                                # let's create a new socket
                                my $psock = $sock->accept;
                                $sel->add($psock);
                                $Handlers{*$psock} = LDAP::Virtual->new($psock);
                        } else {
                                my $result = $Handlers{*$fh}->handle;
                                if ($result) {
                                        # we have finished with the socket
                                        $sel->remove($fh);
                                        $fh->close;
                                        delete $Handlers{*$fh};
                                }
                        }
                }
        }
}

=head2 stop

  my $stopped_pids = LDAP::Virtual->stop;

=cut

sub stop {
        warn "## stop pids = ",dump( $pids );
        return unless $pids;
        my $stopped = 0;
        foreach my $port ( keys %$pids ) {
                my $pid = delete($pids->{$port}) or die "no pid?";
                warn "# Shutdown LDAP server at port $port pid $pid\n";
                kill(9,$pid) or die "can't kill $pid: $!";
                waitpid($pid,0) or die "waitpid $pid: $!";
                $stopped++;
        }
        warn "## stopped $stopped processes\n";
        return $stopped;
}

use constant RESULT_OK => {
        'matchedDN' => '',
        'errorMessage' => '',
        'resultCode' => LDAP_SUCCESS
};

# constructor
sub new {
        my ($class, $sock) = @_;
        my $self = $class->SUPER::new($sock);
        printf "Accepted connection from: %s\n", $sock->peerhost();
        return $self;
}

# the bind operation
sub bind {
        my ($self,$req) = @_;

        warn "## bind req = ",dump($req);

        defined($req->{authentication}->{simple}) or return {
                matchedDN => '',
                errorMessage => '',
                resultCode => LDAP_STRONG_AUTH_NOT_SUPPORTED,
        };

        $self->{upstream} ||= Net::LDAP->new( 'ldaps://ldap.ffzg.hr/' ) or return {
                matchedDN => '',
                errorMessage => $@,
                resultCode => LDAP_UNAVAILABLE,
        };

        warn "## upstream = ",dump( $self->{upstream} );
        warn "upstream not Net::LDAP but ",ref($self->{upstream}) unless ref($self->{upstream}) eq 'Net::LDAP';

        my $msg;

        # FIXME we would need to unbind because VLDAP binds us automatically, but that doesn't really work
        #$msg = $self->{upstream}->unbind;
        #warn "# unbind msg = ",dump( $msg );

        my $bind;
        $bind->{dn} = $req->{name} if $req->{name};
        $bind->{password} = $req->{authentication}->{simple} if $req->{authentication}->{simple};
        warn "# bind ",dump( $bind );
        $msg = $self->{upstream}->bind( %$bind );

        #warn "# bind msg = ",dump( $msg );
        if ( $msg->code != LDAP_SUCCESS ) {
                warn "ERROR: ", $msg->code, ": ", $msg->server_error, "\n";
                return {
                        matchedDN => '',
                        errorMessage => $msg->server_error,
                        resultCode => $msg->code,
                };
        }

        return RESULT_OK;
}

# the search operation
sub search {
        my ($self,$req) = @_;

        warn "## search req = ",dump( $req );

        if ( ! $self->{upstream} ) {
                warn "search without bind";
                return {
                        matchedDN => '',
                        errorMessage => 'dude, bind first',
                        resultCode => LDAP_OPERATIONS_ERROR,
                };
        }

        my $filter;
        if (defined $req->{filter}) {
                # $req->{filter} is a ASN1-decoded tree; luckily, this is exactly the
                # internal representation Net::LDAP::Filter uses.  [FIXME] Eventually
                # Net::LDAP::Filter should provide a corresponding constructor.
                bless($req->{filter}, 'Net::LDAP::Filter');
                $filter = $req->{filter}->as_string;
#               $filter = '(&' . $req->{filter}->as_string
#                                          . '(objectClass=hrEduPerson)(host=aai.irb.hr))';
        }

        warn "search upstream for $filter\n";

        my $search = $self->{upstream}->search(
                base => $req->{baseObject},
                scope => $req->{scope},
                deref => $req->{derefAliases},
                sizelimit => $req->{sizeLimit},
                timelimit => $req->{timeLimit},
                typesonly => $req->{typesOnly},
                filter => $filter,
                attrs => $req->{attributes},
                raw => qr/.*/,
        );

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

        if ( $search->code != LDAP_SUCCESS ) {
                warn "ERROR: ",$search->code,": ",$search->server_error;
                return {
                        matchedDN => '',
                        errorMessage => $search->server_error,
                        resultCode => $search->code,
                };
        };

        my @entries = $search->entries;
        warn "## got ", $search->count, " entries for $filter\n";
        foreach my $entry (@entries) {
#               $entry->changetype('add');  # Don't record changes.
#               foreach my $attr ($entry->attributes) {
#                       if ($attr =~ /;lang-en$/) { 
#                               $entry->delete($attr);
#                       }
#               }
        }

        warn "## entries = ",dump( @entries );

#       $self->cache->write_cache( \@entries, uri_escape( $filter ));

        return RESULT_OK, @entries;
}

# the rest of the operations will return an "unwilling to perform"

1;
1	dpavlin	4	package LDAP::Virtual;
2	dpavlin	1
3			use strict;
4			use warnings;
5
6			use Net::LDAP::Constant qw(
7			LDAP_SUCCESS
8			LDAP_STRONG_AUTH_NOT_SUPPORTED
9			LDAP_UNAVAILABLE
10			LDAP_OPERATIONS_ERROR
11			);
12			use Net::LDAP::Server;
13			use Net::LDAP::Filter;
14			use base qw(Net::LDAP::Server);
15			use fields qw(upstream);
16
17	dpavlin	2	use Net::LDAP;
18
19	dpavlin	1	use URI::Escape; # uri_escape
20			use IO::Socket::INET;
21			use IO::Select;
22
23			use Data::Dump qw/dump/;
24
25			=head1 NAME
26
27	dpavlin	4	LDAP::Virtual
28	dpavlin	1
29			=cut
30
31			=head1 DESCRIPTION
32
33	dpavlin	2	Provide LDAP server functionality somewhat similar to C<slapo-rwm>
34	dpavlin	1
35			=head1 METHODS
36
37			=head2 run
38
39	dpavlin	4	my $pid = LDAP::Virtual->run({ port => 1389, fork => 0 });
40	dpavlin	1
41			=cut
42
43			our $pids;
44			our $cache;
45
46			sub cache {
47	dpavlin	5	return $cache;
48	dpavlin	1	}
49
50			sub run {
51			my $self = shift;
52
53			my $args = shift;
54			# default LDAP port
55			my $port = $args->{port} \|\|= 1389;
56
57			if ( $args->{fork} ) {
58			defined(my $pid = fork()) or die "Can't fork: $!";
59			if ( $pid ) {
60			$pids->{ $port } = $pid;
61			warn "# pids = ",dump( $pids );
62			sleep 1;
63			return $pid;
64			}
65			}
66
67			my $sock = IO::Socket::INET->new(
68			Listen => 5,
69			Proto => 'tcp',
70			Reuse => 1,
71			LocalPort => $port,
72			) or die "can't listen on port $port: $!\n";
73
74			warn "LDAP server listening on port $port\n";
75
76			my $sel = IO::Select->new($sock) or die "can't select socket: $!\n";
77			my %Handlers;
78			while (my @ready = $sel->can_read) {
79			foreach my $fh (@ready) {
80			if ($fh == $sock) {
81			# let's create a new socket
82			my $psock = $sock->accept;
83			$sel->add($psock);
84	dpavlin	4	$Handlers{*$psock} = LDAP::Virtual->new($psock);
85	dpavlin	1	} else {
86			my $result = $Handlers{*$fh}->handle;
87			if ($result) {
88			# we have finished with the socket
89			$sel->remove($fh);
90			$fh->close;
91			delete $Handlers{*$fh};
92			}
93			}
94			}
95			}
96			}
97
98			=head2 stop
99
100	dpavlin	4	my $stopped_pids = LDAP::Virtual->stop;
101	dpavlin	1
102			=cut
103
104			sub stop {
105			warn "## stop pids = ",dump( $pids );
106			return unless $pids;
107			my $stopped = 0;
108			foreach my $port ( keys %$pids ) {
109			my $pid = delete($pids->{$port}) or die "no pid?";
110			warn "# Shutdown LDAP server at port $port pid $pid\n";
111			kill(9,$pid) or die "can't kill $pid: $!";
112			waitpid($pid,0) or die "waitpid $pid: $!";
113			$stopped++;
114			}
115			warn "## stopped $stopped processes\n";
116			return $stopped;
117			}
118
119			use constant RESULT_OK => {
120			'matchedDN' => '',
121			'errorMessage' => '',
122			'resultCode' => LDAP_SUCCESS
123			};
124
125			# constructor
126			sub new {
127			my ($class, $sock) = @_;
128			my $self = $class->SUPER::new($sock);
129			printf "Accepted connection from: %s\n", $sock->peerhost();
130			return $self;
131			}
132
133			# the bind operation
134			sub bind {
135			my ($self,$req) = @_;
136
137			warn "## bind req = ",dump($req);
138
139			defined($req->{authentication}->{simple}) or return {
140			matchedDN => '',
141			errorMessage => '',
142			resultCode => LDAP_STRONG_AUTH_NOT_SUPPORTED,
143			};
144
145	dpavlin	2	$self->{upstream} \|\|= Net::LDAP->new( 'ldaps://ldap.ffzg.hr/' ) or return {
146	dpavlin	1	matchedDN => '',
147			errorMessage => $@,
148			resultCode => LDAP_UNAVAILABLE,
149			};
150
151	dpavlin	2	warn "## upstream = ",dump( $self->{upstream} );
152			warn "upstream not Net::LDAP but ",ref($self->{upstream}) unless ref($self->{upstream}) eq 'Net::LDAP';
153	dpavlin	1
154			my $msg;
155
156	dpavlin	2	# FIXME we would need to unbind because VLDAP binds us automatically, but that doesn't really work
157	dpavlin	1	#$msg = $self->{upstream}->unbind;
158			#warn "# unbind msg = ",dump( $msg );
159
160	dpavlin	3	my $bind;
161			$bind->{dn} = $req->{name} if $req->{name};
162			$bind->{password} = $req->{authentication}->{simple} if $req->{authentication}->{simple};
163			warn "# bind ",dump( $bind );
164			$msg = $self->{upstream}->bind( %$bind );
165	dpavlin	1
166			#warn "# bind msg = ",dump( $msg );
167			if ( $msg->code != LDAP_SUCCESS ) {
168			warn "ERROR: ", $msg->code, ": ", $msg->server_error, "\n";
169			return {
170			matchedDN => '',
171			errorMessage => $msg->server_error,
172			resultCode => $msg->code,
173			};
174			}
175
176			return RESULT_OK;
177			}
178
179			# the search operation
180			sub search {
181			my ($self,$req) = @_;
182
183			warn "## search req = ",dump( $req );
184
185			if ( ! $self->{upstream} ) {
186			warn "search without bind";
187			return {
188			matchedDN => '',
189			errorMessage => 'dude, bind first',
190			resultCode => LDAP_OPERATIONS_ERROR,
191			};
192			}
193
194			my $filter;
195			if (defined $req->{filter}) {
196			# $req->{filter} is a ASN1-decoded tree; luckily, this is exactly the
197			# internal representation Net::LDAP::Filter uses. [FIXME] Eventually
198			# Net::LDAP::Filter should provide a corresponding constructor.
199			bless($req->{filter}, 'Net::LDAP::Filter');
200			$filter = $req->{filter}->as_string;
201			# $filter = '(&' . $req->{filter}->as_string
202			# . '(objectClass=hrEduPerson)(host=aai.irb.hr))';
203			}
204
205			warn "search upstream for $filter\n";
206
207			my $search = $self->{upstream}->search(
208			base => $req->{baseObject},
209			scope => $req->{scope},
210			deref => $req->{derefAliases},
211			sizelimit => $req->{sizeLimit},
212			timelimit => $req->{timeLimit},
213			typesonly => $req->{typesOnly},
214			filter => $filter,
215			attrs => $req->{attributes},
216			raw => qr/.*/,
217			);
218
219			# warn "# search = ",dump( $search );
220
221			if ( $search->code != LDAP_SUCCESS ) {
222			warn "ERROR: ",$search->code,": ",$search->server_error;
223			return {
224			matchedDN => '',
225			errorMessage => $search->server_error,
226			resultCode => $search->code,
227			};
228			};
229
230			my @entries = $search->entries;
231			warn "## got ", $search->count, " entries for $filter\n";
232			foreach my $entry (@entries) {
233			# $entry->changetype('add'); # Don't record changes.
234			# foreach my $attr ($entry->attributes) {
235			# if ($attr =~ /;lang-en$/) {
236			# $entry->delete($attr);
237			# }
238			# }
239			}
240
241			warn "## entries = ",dump( @entries );
242
243	dpavlin	5	# $self->cache->write_cache( \@entries, uri_escape( $filter ));
244	dpavlin	1
245			return RESULT_OK, @entries;
246			}
247
248			# the rest of the operations will return an "unwilling to perform"
249
250			1;