Metacat

#!/usr/bin/perl -w

#

#  '$RCSfile$'

#  Copyright: 2001 Regents of the University of California 

#

#   '$Author: tao $'

#     '$Date: 2013-09-17 10:36:13 -0700 (Tue, 17 Sep 2013) $'

# '$Revision: 8220 $' 

# 

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

#

#

# This is a web-based application for allowing users to register a new

# account for Metacat access.  We currently only support LDAP even

# though metacat could potentially support other types of directories.

use lib '../WEB-INF/lib';

use strict;             # turn on strict syntax checking

use Template;           # load the template-toolkit module

use CGI qw/:standard :html3/; # load the CGI module 

use Net::LDAP;          # load the LDAP net libraries

use Net::SMTP;          # load the SMTP net libraries

use Digest::SHA1;       # for creating the password hash

use MIME::Base64;       # for creating the password hash

use URI;                # for parsing URL syntax

use Config::Properties; # for parsing Java .properties files

use File::Basename;     # for path name parsing

use Captcha::reCAPTCHA; # for protection against spams

use Cwd 'abs_path';

# Global configuration paramters

# This entire block (including skin parsing) could be pushed out to a separate .pm file

my $cgiUrl = $ENV{'SCRIPT_FILENAME'};

my $workingDirectory = dirname($cgiUrl);

my $metacatProps = "${workingDirectory}/../WEB-INF/metacat.properties";

my $properties = new Config::Properties();

unless (open (METACAT_PROPERTIES, $metacatProps)) {

    print "Content-type: text/html\n\n";

    print "Unable to locate Metacat properties. Working directory is set as " . 

        $workingDirectory .", is this correct?";

    exit(0);

}

$properties->load(*METACAT_PROPERTIES);

# local directory configuration

my $skinsDir = "${workingDirectory}/../style/skins";

my $templatesDir = abs_path("${workingDirectory}/../style/common/templates");

my $tempDir = $properties->getProperty('application.tempDir');

# url configuration

my $server = $properties->splitToTree(qr/\./, 'server');

my $protocol = 'http://';

if ( $properties->getProperty('server.httpPort') eq '443' ) {

	$protocol = 'https://';

}

my $contextUrl = $protocol . $properties->getProperty('server.name');

if ($properties->getProperty('server.httpPort') ne '80') {

        $contextUrl = $contextUrl . ':' . $properties->getProperty('server.httpPort');

}

$contextUrl = $contextUrl . '/' .  $properties->getProperty('application.context');

my $metacatUrl = $contextUrl . "/metacat";

my $cgiPrefix = "/" . $properties->getProperty('application.context') . "/cgi-bin";

my $styleSkinsPath = $contextUrl . "/style/skins";

my $styleCommonPath = $contextUrl . "/style/common";

#recaptcha key information

my $recaptchaPublicKey=$properties->getProperty('ldap.recaptcha.publickey');

my $recaptchaPrivateKey=$properties->getProperty('ldap.recaptcha.privatekey');

my @errorMessages;

my $error = 0;

my $emailVerification= 'emailverification';

# Import all of the HTML form fields as variables

import_names('FORM');

# Must have a config to use Metacat

my $skinName = "";

if ($FORM::cfg) {

    $skinName = $FORM::cfg;

} elsif ($ARGV[0]) {

    $skinName = $ARGV[0];

} else {

    debug("No configuration set.");

    print "Content-type: text/html\n\n";

    print 'LDAPweb Error: The registry requires a skin name to continue.';

    exit();

}

# Metacat isn't initialized, the registry will fail in strange ways.

if (!($metacatUrl)) {

    debug("No Metacat.");

    print "Content-type: text/html\n\n";

    'Registry Error: Metacat is not initialized! Make sure' .

        ' MetacatUrl is set correctly in ' .  $skinName . '.properties';

    exit();

}

my $skinProperties = new Config::Properties();

if (!($skinName)) {

    $error = "Application misconfigured.  Please contact the administrator.";

    push(@errorMessages, $error);

} else {

    my $skinProps = "$skinsDir/$skinName/$skinName.properties";

    unless (open (SKIN_PROPERTIES, $skinProps)) {

        print "Content-type: text/html\n\n";

        print "Unable to locate skin properties at $skinProps.  Is this path correct?";

        exit(0);

    }

    $skinProperties->load(*SKIN_PROPERTIES);

}

my $config = $skinProperties->splitToTree(qr/\./, 'registry.config');

# XXX HACK: this is a temporary fix to pull out the UCNRS password property from the

#           NRS skin instead of metacat.properties. The intent is to prevent editing

#           of our core properties file, which is manipulated purely through the web.

#           Once organizations are editable, this section should be removed as should

#           the properties within nrs/nrs.properties.

my $nrsProperties = new Config::Properties();

my $nrsProps = "$skinsDir/nrs/nrs.properties";

unless (open (NRS_PROPERTIES, $nrsProps)) {

    print "Content-type: text/html\n\n";

    print "Unable to locate skin properties at $nrsProps.  Is this path correct?";

    exit(0);

}

$nrsProperties->load(*NRS_PROPERTIES);

my $nrsConfig = $nrsProperties->splitToTree(qr/\./, 'registry.config');

# XXX END HACK

my $searchBase;

my $ldapUsername;

my $ldapPassword;

# TODO: when should we use surl instead? Is there a setting promoting one over the other?

# TODO: the default tree for accounts should be exposed somewhere, defaulting to unaffiliated

my $ldapurl = $properties->getProperty('auth.url');

# Java uses miliseconds, Perl expects whole seconds

my $timeout = $properties->getProperty('ldap.connectTimeLimit') / 1000;

# Get the CGI input variables

my $query = new CGI;

my $debug = 1;

#--------------------------------------------------------------------------80c->

# Set up the Template Toolkit to read html form templates

# templates hash, imported from ldap.templates tree in metacat.properties

my $templates = $properties->splitToTree(qr/\./, 'ldap.templates');

$$templates{'header'} = $skinProperties->getProperty("registry.templates.header");

$$templates{'footer'} = $skinProperties->getProperty("registry.templates.footer");

# set some configuration options for the template object

my $ttConfig = {

             INCLUDE_PATH => $templatesDir,

             INTERPOLATE  => 0,

             POST_CHOMP   => 1,

             DEBUG        => 1, 

             };

# create an instance of the template

my $template = Template->new($ttConfig) || handleGeneralServerFailure($Template::ERROR);

# custom LDAP properties hash

my $ldapCustom = $properties->splitToTree(qr/\./, 'ldap');

# This is a hash which has the keys of the organization's properties 'name', 'base', 'organization'.

my $orgProps = $properties->splitToTree(qr/\./, 'organization');

#This is a hash which has the keys of the ldap sub tree names of the organizations, such as 'NCEAS', 'LTER' and 'KU', and values are real name of the organization.

my $orgNames = $properties->splitToTree(qr/\./, 'organization.name');

# pull out properties available e.g. 'name', 'base'

my @orgData = keys(%$orgProps);

my @orgList; #An array has the names (i.e, sub tree names, such as 'NCEAS', 'LTER' and 'KU')  of the all organizations in the metacat.properties. 

while (my ($oKey, $oVal) = each(%$orgNames)) {

    push(@orgList, $oKey);

}

my $authBase = $properties->getProperty("auth.base");

my $ldapConfig;

foreach my $o (@orgList) {

    foreach my $d (@orgData) {

        $ldapConfig->{$o}{$d} = $properties->getProperty("organization.$d.$o");

    }

    # XXX hack, remove after 1.9

    if ($o eq 'UCNRS') {

        $ldapConfig->{'UCNRS'}{'base'} = $nrsConfig->{'base'};

        $ldapConfig->{'UCNRS'}{'user'} = $nrsConfig->{'username'};

        $ldapConfig->{'UCNRS'}{'password'} = $nrsConfig->{'password'};

    }

    # set default base

    if (!$ldapConfig->{$o}{'base'}) {

        $ldapConfig->{$o}{'base'} = $authBase;

    }

    # include filter information. By default, our filters are 'o=$name', e.g. 'o=NAPIER'

    # these can be overridden by specifying them in metacat.properties. Non-default configs

    # such as UCNRS must specify all LDAP properties.

    if ($ldapConfig->{$o}{'base'} eq $authBase) {

        my $filter = "o=$o";

        if (!$ldapConfig->{$o}{'org'}) {

            $ldapConfig->{$o}{'org'} = $filter;

        }

        if (!$ldapConfig->{$o}{'filter'}) {

            #$ldapConfig->{$o}{'filter'} = $filter;

            $ldapConfig->{$o}{'filter'} = $ldapConfig->{$o}{'org'};

        }

        # also include DN, which is just org + base

        if ($ldapConfig->{$o}{'org'}) {

            $ldapConfig->{$o}{'dn'} = $ldapConfig->{$o}{'org'} . "," . $ldapConfig->{$o}{'base'};

        }

    } else {

        $ldapConfig->{$o}{'dn'} = $ldapConfig->{$o}{'base'};

    }

    # set LDAP administrator user account

    if (!$ldapConfig->{$o}{'user'}) {

        $ldapConfig->{$o}{'user'} = $ldapConfig->{'unaffiliated'}{'user'};

    }

    # check for a fully qualified LDAP name. If it doesn't exist, append base.

    my @userParts = split(',', $ldapConfig->{$o}{'user'});

    if (scalar(@userParts) == 1) {

        $ldapConfig->{$o}{'user'} = $ldapConfig->{$o}{'user'} . "," . $ldapConfig->{$o}{'base'};

    }

    if (!$ldapConfig->{$o}{'password'}) {

        $ldapConfig->{$o}{'password'} = $ldapConfig->{'unaffiliated'}{'password'};

    }

}

### Determine the display organization list (such as NCEAS, Account ) in the ldap template files

my $displayOrgListStr;

$displayOrgListStr = $skinProperties->getProperty("ldap.templates.organizationList") or $displayOrgListStr = $properties->getProperty('ldap.templates.organizationList');

debug("the string of the org from properties : " . $displayOrgListStr);

my @displayOrgList = split(';', $displayOrgListStr);

my @validDisplayOrgList; #this array contains the org list which will be shown in the templates files.

my %orgNamesHash = %$orgNames;

foreach my $element (@displayOrgList) {

    if(exists $orgNamesHash{$element}) {

         debug("push the organization " . $element . " into the dispaly array");

         #if the name is found in the organization part of metacat.properties, put it into the valid array

         push(@validDisplayOrgList, $element);

    } 

}

if(!@validDisplayOrgList) {

     my $sender;

     $sender = $skinProperties->getProperty("email.sender") or $sender = $properties->getProperty('email.sender');

    print "Content-type: text/html\n\n";

    print "The value of property ldap.templates.organizationList in " 

     . $skinName . ".properties file or metacat.properties file (if the property doesn't exist in the " 

     . $skinName . ".properties file) is invalid. Please send the information to ". $sender;

    exit(0);

}

#--------------------------------------------------------------------------80c->

# Define the main program logic that calls subroutines to do the work

#--------------------------------------------------------------------------80c->

# The processing step we are handling

my $stage = $query->param('stage') || $templates->{'stage'};

my $cfg = $query->param('cfg');

debug("started with stage $stage, cfg $cfg");

# define the possible stages

my %stages = (

              'initregister'      => \&handleInitRegister,

              'register'          => \&handleRegister,

              'registerconfirmed' => \&handleRegisterConfirmed,

              'simplesearch'      => \&handleSimpleSearch,

              'initaddentry'      => \&handleInitAddEntry,

              'addentry'          => \&handleAddEntry,

              'initmodifyentry'   => \&handleInitModifyEntry,

              'modifyentry'       => \&handleModifyEntry,

              'changepass'        => \&handleChangePassword,

              'initchangepass'    => \&handleInitialChangePassword,

              'resetpass'         => \&handleResetPassword,

              'initresetpass'     => \&handleInitialResetPassword,

              'emailverification' => \&handleEmailVerification,

             );

# call the appropriate routine based on the stage

if ( $stages{$stage} ) {

  $stages{$stage}->();

} else {

  &handleResponseMessage();

}

#--------------------------------------------------------------------------80c->

# Define the subroutines to do the work

#--------------------------------------------------------------------------80c->

sub fullTemplate {

    my $templateList = shift;

    my $templateVars = setVars(shift);

    my $c = Captcha::reCAPTCHA->new;

    my $captcha = 'captcha';

    #my $error=null;

    my $use_ssl= 1;

    #my $options=null;

    $templateVars->{$captcha} = $c->get_html($recaptchaPublicKey,undef, $use_ssl, undef);

    $template->process( $templates->{'header'}, $templateVars );

    foreach my $tmpl (@{$templateList}) {

        $template->process( $templates->{$tmpl}, $templateVars );

    }

    $template->process( $templates->{'footer'}, $templateVars );

}

#

# create the initial registration form 

#

sub handleInitRegister {

  my $vars = shift;

  print "Content-type: text/html\n\n";

  # process the template files:

  fullTemplate(['register'], {stage => "register"}); 

  exit();

}

#

# process input from the register stage, which occurs when

# a user submits form data to create a new account

#

sub handleRegister {

    print "Content-type: text/html\n\n";

    if ($query->param('o') =~ "LTER") {

      fullTemplate( ['registerLter'] );

      exit(0);

    } 

    my $allParams = { 'givenName' => $query->param('givenName'), 

                      'sn' => $query->param('sn'),

                      'o' => $query->param('o'), 

                      'mail' => $query->param('mail'), 

                      'uid' => $query->param('uid'), 

                      'userPassword' => $query->param('userPassword'), 

                      'userPassword2' => $query->param('userPassword2'), 

                      'title' => $query->param('title'), 

                      'telephoneNumber' => $query->param('telephoneNumber') };

    # Check the recaptcha

    my $c = Captcha::reCAPTCHA->new;

    my $challenge = $query->param('recaptcha_challenge_field');

    my $response = $query->param('recaptcha_response_field');

    # Verify submission

    my $result = $c->check_answer(

        $recaptchaPrivateKey, $ENV{'REMOTE_ADDR'},

        $challenge, $response

    );

    if ( $result->{is_valid} ) {

        #print "Yes!";

        #exit();

    }

    else {

        my $errorMessage = "The verification code is wrong. Please input again.";

        fullTemplate(['register'], { stage => "register",

                                     allParams => $allParams,

                                     errorMessage => $errorMessage });

        exit();

    }

    # Check that all required fields are provided and not null

    my @requiredParams = ( 'givenName', 'sn', 'o', 'mail', 

                           'uid', 'userPassword', 'userPassword2');

    if (! paramsAreValid(@requiredParams)) {

        my $errorMessage = "Required information is missing. " .

            "Please fill in all required fields and resubmit the form.";

        fullTemplate(['register'], { stage => "register",

                                     allParams => $allParams,

                                     errorMessage => $errorMessage });

        exit();

    } else {

         if ($query->param('userPassword') ne $query->param('userPassword2')) {

            my $errorMessage = "The passwords do not match. Try again.";

            fullTemplate( ['registerFailed', 'register'], { stage => "register",

                                                            allParams => $allParams,

                                                            errorMessage => $errorMessage });

            exit();

        }

        my $o = $query->param('o');    

        $searchBase = $ldapConfig->{$o}{'base'};  

    }

    # Search LDAP for matching entries that already exist

    # Some forms use a single text search box, whereas others search per

    # attribute.

    my $filter;

    if ($query->param('searchField')) {

      $filter = "(|" . 

                "(uid=" . $query->param('searchField') . ") " .

                "(mail=" . $query->param('searchField') . ")" .

                "(&(sn=" . $query->param('searchField') . ") " . 

                "(givenName=" . $query->param('searchField') . "))" . 

                ")";

    } else {

      $filter = "(|" . 

                "(uid=" . $query->param('uid') . ") " .

                "(mail=" . $query->param('mail') . ")" .

                "(&(sn=" . $query->param('sn') . ") " . 

                "(givenName=" . $query->param('givenName') . "))" . 

                ")";

    }

    my @attrs = [ 'uid', 'o', 'ou', 'cn', 'mail', 'telephoneNumber', 'title' ];

    my $found = findExistingAccounts($ldapurl, $searchBase, $filter, \@attrs);

    # If entries match, send back a request to confirm new-user creation

    if ($found) {

      fullTemplate( ['registerMatch', 'register'], { stage => "registerconfirmed",

                                                     allParams => $allParams,

                                                     foundAccounts => $found });

    # Otherwise, create a new user in the LDAP directory

    } else {

        createTemporaryAccount($allParams);

    }

    exit();

}

#

# process input from the registerconfirmed stage, which occurs when

# a user chooses to create an account despite similarities to other

# existing accounts

#

sub handleRegisterConfirmed {

    my $allParams = { 'givenName' => $query->param('givenName'), 

                      'sn' => $query->param('sn'),

                      'o' => $query->param('o'), 

                      'mail' => $query->param('mail'), 

                      'uid' => $query->param('uid'), 

                      'userPassword' => $query->param('userPassword'), 

                      'userPassword2' => $query->param('userPassword2'), 

                      'title' => $query->param('title'), 

                      'telephoneNumber' => $query->param('telephoneNumber') };

    print "Content-type: text/html\n\n";

    createTemporaryAccount($allParams);

    exit();

}

#

# change a user's password upon request

#

sub handleChangePassword {

    print "Content-type: text/html\n\n";

    my $allParams = { 'test' => "1", };

    if ($query->param('uid')) {

        $$allParams{'uid'} = $query->param('uid');

    }

    if ($query->param('o')) {

        $$allParams{'o'} = $query->param('o');

        my $o = $query->param('o');

        $searchBase = $ldapConfig->{$o}{'base'};

    }

    # Check that all required fields are provided and not null

    my @requiredParams = ( 'uid', 'o', 'oldpass', 

                           'userPassword', 'userPassword2');

    if (! paramsAreValid(@requiredParams)) {

        my $errorMessage = "Required information is missing. " .

            "Please fill in all required fields and submit the form.";

        fullTemplate( ['changePass'], { stage => "changepass",

                                        allParams => $allParams,

                                        errorMessage => $errorMessage });

        exit();

    }

    # We have all of the info we need, so try to change the password

    if ($query->param('userPassword') =~ $query->param('userPassword2')) {

        my $o = $query->param('o');

        $searchBase = $ldapConfig->{$o}{'base'};

        $ldapUsername = $ldapConfig->{$o}{'user'};

        $ldapPassword = $ldapConfig->{$o}{'password'};

        my $dn = "uid=" . $query->param('uid') . "," . $ldapConfig->{$o}{'dn'};;

        if ($query->param('o') =~ "LTER") {

            fullTemplate( ['registerLter'] );

        } else {

            my $errorMessage = changePassword(

                    $dn, $query->param('userPassword'), 

                    $dn, $query->param('oldpass'), $query->param('o'));

            if ($errorMessage) {

                fullTemplate( ['changePass'], { stage => "changepass",

                                                allParams => $allParams,

                                                errorMessage => $errorMessage });

                exit();

            } else {

                fullTemplate( ['changePassSuccess'], { stage => "changepass",

                                                       allParams => $allParams });

                exit();

            }

        }

    } else {

        my $errorMessage = "The passwords do not match. Try again.";

        fullTemplate( ['changePass'], { stage => "changepass",

                                        allParams => $allParams,

                                        errorMessage => $errorMessage });

        exit();

    }

}

#

# change a user's password upon request - no input params

# only display chagepass template without any error

#

sub handleInitialChangePassword {

    print "Content-type: text/html\n\n";

    my $allParams = { 'test' => "1", };

    my $errorMessage = "";

    fullTemplate( ['changePass'], { stage => "changepass",

                                    errorMessage => $errorMessage });

    exit();

}

#

# reset a user's password upon request

#

sub handleResetPassword {

    print "Content-type: text/html\n\n";

    my $allParams = { 'test' => "1", };

    if ($query->param('uid')) {

        $$allParams{'uid'} = $query->param('uid');

    }

    if ($query->param('o')) {

        $$allParams{'o'} = $query->param('o');

        my $o = $query->param('o');

        $searchBase = $ldapConfig->{$o}{'base'};

        $ldapUsername = $ldapConfig->{$o}{'user'};

        $ldapPassword = $ldapConfig->{$o}{'password'};

    }

    # Check that all required fields are provided and not null

    my @requiredParams = ( 'uid', 'o' );

    if (! paramsAreValid(@requiredParams)) {

        my $errorMessage = "Required information is missing. " .

            "Please fill in all required fields and submit the form.";

        fullTemplate( ['resetPass'],  { stage => "resetpass",

                                        allParams => $allParams,

                                        errorMessage => $errorMessage });

        exit();

    }

    # We have all of the info we need, so try to change the password

    my $o = $query->param('o');

    my $dn = "uid=" . $query->param('uid') . "," . $ldapConfig->{$o}{'dn'};

    debug("handleResetPassword: dn: $dn");

    if ($query->param('o') =~ "LTER") {

        fullTemplate( ['registerLter'] );

        exit();

    } else {

        my $errorMessage = "";

        my $recipient;

        my $userPass;

        my $entry = getLdapEntry($ldapurl, $searchBase, 

                $query->param('uid'), $query->param('o'));

        if ($entry) {

            $recipient = $entry->get_value('mail');

            $userPass = getRandomPassword();

            $errorMessage = changePassword($dn, $userPass, $ldapUsername, $ldapPassword, $query->param('o'));

        } else {

            $errorMessage = "User not found in database.  Please try again.";

        }

        if ($errorMessage) {

            fullTemplate( ['resetPass'], { stage => "resetpass",

                                           allParams => $allParams,

                                           errorMessage => $errorMessage });

            exit();

        } else {

            my $errorMessage = sendPasswordNotification($query->param('uid'),

                    $query->param('o'), $userPass, $recipient, $cfg);

            fullTemplate( ['resetPassSuccess'], { stage => "resetpass",

                                                  allParams => $allParams,

                                                  errorMessage => $errorMessage });

            exit();

        }

    }

}

#

# reset a user's password upon request- no initial params

# only display resetpass template without any error

#

sub handleInitialResetPassword {

    print "Content-type: text/html\n\n";

    my $errorMessage = "";

    fullTemplate( ['resetPass'], { stage => "resetpass",

                                   errorMessage => $errorMessage });

    exit();

}

#

# Construct a random string to use for a newly reset password

#

sub getRandomPassword {

    my $length = shift;

    if (!$length) {

        $length = 8;

    }

    my $newPass = "";

    my @chars = ( "A" .. "Z", "a" .. "z", 0 .. 9, qw(! @ $ ^) );

    $newPass = join("", @chars[ map { rand @chars } ( 1 .. $length ) ]);

    return $newPass;

}

#

# Change a password to a new value, binding as the provided user

#

sub changePassword {

    my $userDN = shift;

    my $userPass = shift;

    my $bindDN = shift;

    my $bindPass = shift;

    my $o = shift;

    my $searchBase = $ldapConfig->{$o}{'base'};

    my $errorMessage = 0;

    my $ldap;

    #if main ldap server is down, a html file containing warning message will be returned

    $ldap = Net::LDAP->new($ldapurl, timeout => $timeout) or handleLDAPBindFailure($ldapurl);

    if ($ldap) {

        #$ldap->start_tls( verify => 'require',

                      #cafile => '/usr/share/ssl/ldapcerts/cacert.pem');

        $ldap->start_tls( verify => 'none');

        debug("changePassword: attempting to bind to $bindDN");

        my $bindresult = $ldap->bind( version => 3, dn => $bindDN, 

                                  password => $bindPass );

        if ($bindresult->code) {

            $errorMessage = "Failed to log in. Are you sure your connection credentails are " .

                            "correct? Please correct and try again...";

            return $errorMessage;

        }

    	# Find the user here and change their entry

    	my $newpass = createSeededPassHash($userPass);

    	my $modifications = { userPassword => $newpass };

      debug("changePass: setting password for $userDN to $newpass");

    	my $result = $ldap->modify( $userDN, replace => { %$modifications });

    	if ($result->code()) {

            debug("changePass: error changing password: " . $result->error);

        	$errorMessage = "There was an error changing the password:" .

                           "<br />\n" . $result->error;

    	} 

    	$ldap->unbind;   # take down session

    }

    return $errorMessage;

}

#

# generate a Seeded SHA1 hash of a plaintext password

#

sub createSeededPassHash {

    my $secret = shift;

    my $salt = "";

    for (my $i=0; $i < 4; $i++) {

        $salt .= int(rand(10));

    }

    my $ctx = Digest::SHA1->new;

    $ctx->add($secret);

    $ctx->add($salt);

    my $hashedPasswd = '{SSHA}' . encode_base64($ctx->digest . $salt ,'');

    return $hashedPasswd;

}

#

# Look up an ldap entry for a user

#

sub getLdapEntry {

    my $ldapurl = shift;

    my $base = shift;

    my $username = shift;

    my $org = shift;

    my $entry = "";

    my $mesg;

    my $ldap;

    debug("ldap server: $ldapurl");

    #if main ldap server is down, a html file containing warning message will be returned

    $ldap = Net::LDAP->new($ldapurl, timeout => $timeout) or handleLDAPBindFailure($ldapurl);

    if ($ldap) {

    	$ldap->start_tls( verify => 'none');

    	my $bindresult = $ldap->bind;

    	if ($bindresult->code) {

        	return $entry;

    	}

    	if($ldapConfig->{$org}{'filter'}){

            debug("getLdapEntry: filter set, searching for base=$base, " .

                  "(&(uid=$username)($ldapConfig->{$org}{'filter'})");

        	$mesg = $ldap->search ( base   => $base,

                filter => "(&(uid=$username)($ldapConfig->{$org}{'filter'}))");

    	} else {

            debug("getLdapEntry: no filter, searching for $base, (uid=$username)");

        	$mesg = $ldap->search ( base   => $base, filter => "(uid=$username)");

    	}

    	if ($mesg->count > 0) {

        	$entry = $mesg->pop_entry;

        	$ldap->unbind;   # take down session

    	} else {

        	$ldap->unbind;   # take down session

        	# Follow references by recursive call to self

        	my @references = $mesg->references();

        	for (my $i = 0; $i <= $#references; $i++) {

            	my $uri = URI->new($references[$i]);

            	my $host = $uri->host();

            	my $path = $uri->path();

            	$path =~ s/^\///;

            	$entry = &getLdapEntry($host, $path, $username, $org);

            	if ($entry) {

                    debug("getLdapEntry: recursion found $host, $path, $username, $org");

                	return $entry;

            	}

        	}

    	}

    }

    return $entry;

}

# 

# send an email message notifying the user of the pw change

#

sub sendPasswordNotification {

    my $username = shift;

    my $org = shift;

    my $newPass = shift;

    my $recipient = shift;

    my $cfg = shift;

    my $errorMessage = "";

    if ($recipient) {

        my $mailhost = $properties->getProperty('email.mailhost');

        my $sender;

        $sender = $skinProperties->getProperty("email.sender") or $sender = $properties->getProperty('email.sender');

        # Send the email message to them

        my $smtp = Net::SMTP->new($mailhost);

        $smtp->mail($sender);

        $smtp->to($recipient);

        my $message = <<"        ENDOFMESSAGE";

        To: $recipient

        From: $sender

        Subject: KNB Password Reset

        Somebody (hopefully you) requested that your KNB password be reset.  

        This is generally done when somebody forgets their password.  Your 

        password can be changed by visiting the following URL:

        $contextUrl/cgi-bin/ldapweb.cgi?stage=changepass&cfg=$cfg

            Username: $username

        Organization: $org

        New Password: $newPass

        Thanks,

            The KNB Development Team