#!/usr/bin/perl -w
#
# Overview: This trigger script authenticates a Perforce userid against
# against an AD sAMAccount name.  It will handle multiple domains.
#
# sample trigger usage:
#  ad auth-check auth "/usr/bin/perl AD_auth.pl %user%"

use strict;

use Net::LDAP;

$|=1;

######################## Set Variables ####################################

# AD connect timeout
my $timeout = 10;

# Set AD server info. 
my $ad_port = "389";    # AD Port, should probably leave.
my $ad_host = "AD IP";  # Put IP of your AD server here

# AD read Account.
# Full DN including user.  You don't need to use an Administrator account
# any account should do I suggest you change the below line to a standard user.
my $ad_read_dn   = 'CN=user,CN=Users,DC=test,DC=domain,DC=com';
my $ad_read_p    = 'Password';

###########################################################################
open(STDERR, ">&STDOUT") or die "Can't dup stdout";

if (scalar(@ARGV != 1)) { die "\nUsage:\nAD_auth.pl \%username\%\n" }

my $p4_user = shift;
chomp $p4_user;

my $password = <STDIN>;
$password =~ s/\r\n//;
chomp $password;

if ($password =~ /^$/) { die "Null passwords not allowed" }

#####  Authenticate! ######################################################
my $ad = Net::LDAP->new($ad_host, port => $ad_port, timeout => $timeout ) ||
	die "Unable to connect with read account";

my $mesg = $ad->bind ("$ad_read_dn", password => $ad_read_p, version => 3 ) ||
	die "Unable to bind\n";


$mesg = $ad->search( base   => '',
                     filter => "(objectclass=*)",
                     scope => 'base' );
my $ret = 1;

my $tc = Net::LDAP->new($ad_host, port => $ad_port, timeout => $timeout ) ||
  die "Unable to connect with read account";

my @entries = ($mesg->entries);
foreach my $entry (@entries) {
 my $root_dn = $entry->get_value('rootDomainNamingContext');

 $mesg = $ad->search   ( base   => $root_dn,
                         filter => "(samaccountname=$p4_user)",
                         scope => 'sub',
                         attrs  => "mail" ) || next;

	my @users = ($mesg->entries);
	next if (! defined $users[0]);

	$mesg = $tc->bind(dn => $users[0]->dn(), password => $password) || next;

	if (! $mesg->code) { $ret = 0; last }
}

if ($ret) { print "Authentication Failed.  Access Denied" }
exit $ret;