Try this simple form entry CGI. If this works add your real code into the subroutines

#!/usr/bin/perl
use strict;
use CGI;
use CGI::Carp 'fatalsToBrowser'; # remove when finished testing
use Net::LDAP;
use IPC::System::Simple qw(system capture);

# input
# create CGI query object to get the SSO from URL
my $q = new CGI;
my $sso = $q->param( "sso" );
$sso =~ s/[^0-9]//g; # remove non digit

# process
my $msg;
if ($sso){
  # check LDPA
  my @entries = search_LDAP($sso);
  if (@entries == 1){
    $msg = process_sso($sso,$entries[0]);
  } else {
    $msg = qq!<h2 style="color:red">ERROR: Wrong SSO [$sso] or User do
+es not exist in OneAD LDAP </h2>!;
  }
} else {
  $msg = q!<h2 style="color:red">ERROR : parameter sso is empty</h2>!;
}

# html page
print $q->header(),$q->start_html('Application Management System');
print $msg;
print qq!<hr/><form action="" method="post">
SSO : <input type="text" name="sso" value="$sso"/>
<input type="submit"/>
</form>!;
print $q->end_html;

sub search_LDAP {
  my $sso = shift;
  return ('test')
}

sub process_sso {
  my ($sso,$usr) = @_;    
  my $msg = "<h2>Processing SSO $sso</h2>";
  return $msg;
}
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