lib/VLDAP/Server.pm

package VLDAP::Server;

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

VLDAP::Server

=cut

=head1 DESCRIPTION

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

=head1 METHODS

=head2 run

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

=cut

our $pids;
our $cache;

sub cache {
        return $cache if $cache;
        $cache = new A3C::Cache->new({ instance => '', dir => 'ldap' });
}

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} = VLDAP::Server->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 = VLDAP::Server->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	1	package VLDAP::Server;
2
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	2	VLDAP::Server
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	2	my $pid = VLDAP::Server->run({ port => 1389, fork => 0 });
40	dpavlin	1
41			=cut
42
43			our $pids;
44			our $cache;
45
46			sub cache {
47			return $cache if $cache;
48			$cache = new A3C::Cache->new({ instance => '', dir => 'ldap' });
49			}
50
51			sub run {
52			my $self = shift;
53
54			my $args = shift;
55			# default LDAP port
56			my $port = $args->{port} \|\|= 1389;
57
58			if ( $args->{fork} ) {
59			defined(my $pid = fork()) or die "Can't fork: $!";
60			if ( $pid ) {
61			$pids->{ $port } = $pid;
62			warn "# pids = ",dump( $pids );
63			sleep 1;
64			return $pid;
65			}
66			}
67
68			my $sock = IO::Socket::INET->new(
69			Listen => 5,
70			Proto => 'tcp',
71			Reuse => 1,
72			LocalPort => $port,
73			) or die "can't listen on port $port: $!\n";
74
75			warn "LDAP server listening on port $port\n";
76
77			my $sel = IO::Select->new($sock) or die "can't select socket: $!\n";
78			my %Handlers;
79			while (my @ready = $sel->can_read) {
80			foreach my $fh (@ready) {
81			if ($fh == $sock) {
82			# let's create a new socket
83			my $psock = $sock->accept;
84			$sel->add($psock);
85	dpavlin	2	$Handlers{*$psock} = VLDAP::Server->new($psock);
86	dpavlin	1	} else {
87			my $result = $Handlers{*$fh}->handle;
88			if ($result) {
89			# we have finished with the socket
90			$sel->remove($fh);
91			$fh->close;
92			delete $Handlers{*$fh};
93			}
94			}
95			}
96			}
97			}
98
99			=head2 stop
100
101	dpavlin	2	my $stopped_pids = VLDAP::Server->stop;
102	dpavlin	1
103			=cut
104
105			sub stop {
106			warn "## stop pids = ",dump( $pids );
107			return unless $pids;
108			my $stopped = 0;
109			foreach my $port ( keys %$pids ) {
110			my $pid = delete($pids->{$port}) or die "no pid?";
111			warn "# Shutdown LDAP server at port $port pid $pid\n";
112			kill(9,$pid) or die "can't kill $pid: $!";
113			waitpid($pid,0) or die "waitpid $pid: $!";
114			$stopped++;
115			}
116			warn "## stopped $stopped processes\n";
117			return $stopped;
118			}
119
120			use constant RESULT_OK => {
121			'matchedDN' => '',
122			'errorMessage' => '',
123			'resultCode' => LDAP_SUCCESS
124			};
125
126			# constructor
127			sub new {
128			my ($class, $sock) = @_;
129			my $self = $class->SUPER::new($sock);
130			printf "Accepted connection from: %s\n", $sock->peerhost();
131			return $self;
132			}
133
134			# the bind operation
135			sub bind {
136			my ($self,$req) = @_;
137
138			warn "## bind req = ",dump($req);
139
140			defined($req->{authentication}->{simple}) or return {
141			matchedDN => '',
142			errorMessage => '',
143			resultCode => LDAP_STRONG_AUTH_NOT_SUPPORTED,
144			};
145
146	dpavlin	2	$self->{upstream} \|\|= Net::LDAP->new( 'ldaps://ldap.ffzg.hr/' ) or return {
147	dpavlin	1	matchedDN => '',
148			errorMessage => $@,
149			resultCode => LDAP_UNAVAILABLE,
150			};
151
152	dpavlin	2	warn "## upstream = ",dump( $self->{upstream} );
153			warn "upstream not Net::LDAP but ",ref($self->{upstream}) unless ref($self->{upstream}) eq 'Net::LDAP';
154	dpavlin	1
155			my $msg;
156
157	dpavlin	2	# FIXME we would need to unbind because VLDAP binds us automatically, but that doesn't really work
158	dpavlin	1	#$msg = $self->{upstream}->unbind;
159			#warn "# unbind msg = ",dump( $msg );
160
161	dpavlin	3	my $bind;
162			$bind->{dn} = $req->{name} if $req->{name};
163			$bind->{password} = $req->{authentication}->{simple} if $req->{authentication}->{simple};
164			warn "# bind ",dump( $bind );
165			$msg = $self->{upstream}->bind( %$bind );
166	dpavlin	1
167			#warn "# bind msg = ",dump( $msg );
168			if ( $msg->code != LDAP_SUCCESS ) {
169			warn "ERROR: ", $msg->code, ": ", $msg->server_error, "\n";
170			return {
171			matchedDN => '',
172			errorMessage => $msg->server_error,
173			resultCode => $msg->code,
174			};
175			}
176
177			return RESULT_OK;
178			}
179
180			# the search operation
181			sub search {
182			my ($self,$req) = @_;
183
184			warn "## search req = ",dump( $req );
185
186			if ( ! $self->{upstream} ) {
187			warn "search without bind";
188			return {
189			matchedDN => '',
190			errorMessage => 'dude, bind first',
191			resultCode => LDAP_OPERATIONS_ERROR,
192			};
193			}
194
195			my $filter;
196			if (defined $req->{filter}) {
197			# $req->{filter} is a ASN1-decoded tree; luckily, this is exactly the
198			# internal representation Net::LDAP::Filter uses. [FIXME] Eventually
199			# Net::LDAP::Filter should provide a corresponding constructor.
200			bless($req->{filter}, 'Net::LDAP::Filter');
201			$filter = $req->{filter}->as_string;
202			# $filter = '(&' . $req->{filter}->as_string
203			# . '(objectClass=hrEduPerson)(host=aai.irb.hr))';
204			}
205
206			warn "search upstream for $filter\n";
207
208			my $search = $self->{upstream}->search(
209			base => $req->{baseObject},
210			scope => $req->{scope},
211			deref => $req->{derefAliases},
212			sizelimit => $req->{sizeLimit},
213			timelimit => $req->{timeLimit},
214			typesonly => $req->{typesOnly},
215			filter => $filter,
216			attrs => $req->{attributes},
217			raw => qr/.*/,
218			);
219
220			# warn "# search = ",dump( $search );
221
222			if ( $search->code != LDAP_SUCCESS ) {
223			warn "ERROR: ",$search->code,": ",$search->server_error;
224			return {
225			matchedDN => '',
226			errorMessage => $search->server_error,
227			resultCode => $search->code,
228			};
229			};
230
231			my @entries = $search->entries;
232			warn "## got ", $search->count, " entries for $filter\n";
233			foreach my $entry (@entries) {
234			# $entry->changetype('add'); # Don't record changes.
235			# foreach my $attr ($entry->attributes) {
236			# if ($attr =~ /;lang-en$/) {
237			# $entry->delete($attr);
238			# }
239			# }
240			}
241
242			warn "## entries = ",dump( @entries );
243
244			$self->cache->write_cache( \@entries, uri_escape( $filter ));
245
246			return RESULT_OK, @entries;
247			}
248
249			# the rest of the operations will return an "unwilling to perform"
250
251			1;