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<?php
# $Id: ldap.php 2714 2019-03-10 23:43:22Z tom.houdayer $

/* written by steweb57, Rexy & Tom HOUDAYER */
/****************************************************************
*                       GLOBAL FILE PATHS                       *
*****************************************************************/
define('CONF_FILE', '/usr/local/etc/alcasar.conf');

/****************************************************************
*                       FILE reading test                       *
*****************************************************************/
$conf_files = array(CONF_FILE);
foreach ($conf_files as $file) {
        if (!file_exists($file)) {
                exit("Fichier $file non présent");
        }
        if (!is_readable($file)) {
                exit("Vous n'avez pas les droits de lecture sur le fichier $file");
        }
}

/****************************************************************
*                       Read CONF_FILE                          *
*****************************************************************/
$file_conf = fopen(CONF_FILE, 'r');
if (!$file_conf) {
        exit('Error opening the file '.CONF_FILE);
}
while (!feof($file_conf)) {
        $buffer = fgets($file_conf, 4096);
        if ((strpos($buffer, '=') !== false) && (substr($buffer, 0, 1) !== '#')) {
                $tmp = explode('=', $buffer, 2);
                $conf[trim($tmp[0])] = trim($tmp[1]);
        }
}
fclose($file_conf);

/****************************************************************
*                       Choice of language                      *
*****************************************************************/
$Language = 'en';
if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
        $Langue   = explode(',', $_SERVER['HTTP_ACCEPT_LANGUAGE']);
        $Language = strtolower(substr(chop($Langue[0]), 0, 2));
}
if ($Language === 'fr') {               // French
        $l_ldap_update                  = "Mise à jour des paramètres LDAP effectuée";
        $l_ldap_title                   = "Authentification externe : LDAP";
        $l_ldap_legend                  = "Authentification LDAP";
        $l_ldap_auth_enable_label       = "Éditer la configuration LDAP:";
        $l_ldap_YES                     = "OUI";
        $l_ldap_NO                      = "NON";
        $l_ldap_server_label            = "Serveur LDAP:";
        $l_ldap_server_text             = "Adresse IP du serveur";
        $l_ldap_base_dn_label           = "DN de la base:";
        $l_ldap_base_dn_text            = "Le DN (Distinguished Name) définit où se situent les informations des utilisateurs dans l'annuaire.<br> - Exemple LDAP: 'o=mycompany, c=FR'.<br> - Exemple AD 'cn=Users,dc=server_name,dc=localdomain'";
        $l_ldap_uid_label               = "Identifiant d'utilisateur (UID):";
        $l_ldap_uid_text                = "Clé utilisée pour rechercher un identifiant de connexion.<br> - Exemple LDAP: 'uid', 'sn', etc.<br> - Pour A.D. mettre 'sAMAccountName'.";
        $l_ldap_base_filter_label       = "Filtre de recherche des utilisateurs (optionnel):";
        $l_ldap_base_filter_text        = "Vous pouvez limiter les objets recherchés avec des filtres additionnels.<br> Exemple 'objectClass=posixGroup' ajouterait le filtre '(&amp;(uid=username)(objectClass=posixGroup))'";
        $l_ldap_user_label              = "CN de l'utilisateur exploité par ALCASAR:";
        $l_ldap_user_text               = "CN=Common Name. Laissez vide pour utiliser un accès invité (ou anonyme). Obligatoire sur un AD.<br> - Exemple LDAP : 'uid=username,ou=my_lan,o=mycompany,c=FR'.<br> - Exemple AD : 'username' ou 'cn=username,cn=Users,dc=server_name,dc=localdomain'";
        $l_ldap_password_label          = "Mot de passe:";
        $l_ldap_password_text           = "Laissez vide pour un accès invité (ou anonyme). Obligatoire sur un AD.";
        $l_ldap_ssl_label               = "Connexion chiffré";
        $l_ldap_ssl_text                = "Utiliser une connexion chiffré avec SSL (LDAPS)";
        $l_ldap_cert_required_label     = "Vérifier le certificat SSL";
        $l_ldap_cert_required_text      = "Vérifier que le serveur LDAP utilise un certificat connu";
        $l_ldap_cert_label              = "Certificat SSL (CA)";
        $l_ldap_cert_text               = "Certificat de l'authorité de certification signant celui du serveur LDAP";
        $l_ldap_cert_status_cur         = "Certificat actuel : ";
        $l_ldap_cert_status_no          = "Aucun certificat installé";
        $l_ldap_submit                  = "Enregistrer";
        $l_ldap_test_service_failed     = "Service LDAP injoignable sur ce serveur (vérifiez l'@IP).";
        $l_ldap_test_service_ok         = "Un port 389 (636 avec SSL) est actif sur ce serveur";
        $l_ldap_test_connection_failed  = "Connexion LDAP impossible (vérifiez le service LDAP sur ce serveur)";
        $l_ldap_test_connection_ok      = "Une connexion LDAP a été établie";
        $l_ldap_test_bind_failed        = "Echec d'authentification (vérifiez l'utilisateur et le mot de passe)";
        $l_ldap_test_bind_ok            = "L'authentification a réussie";
        $l_ldap_test_dn_failed          = "Le DN de la base semble incorrect (vérifiez le)";
        $l_ldap_test_dn_ok              = "Le DN de la base semble correct";
        $l_ldap_error                   = "erreur LDAP";
        $l_ldap_entries                 = "entrées dans la base";
        $l_ldap_cert_cn_diff_dn         = "Le CommonName du certificat (§cert_domainName§) est différent du nom de domaine du serveur";
        $l_check                        = "Vérifier cette configuration";
        $l_checkingConf                 = "Vérification de cette configuration...";
} else {                                // English
        $l_ldap_update                  = "LDAP settings updated";
        $l_ldap_title                   = "External authentication : LDAP";
        $l_ldap_legend                  = "LDAP authentication";
        $l_ldap_auth_enable_label       = "Edit the LDAP configuration :";
        $l_ldap_YES                     = "YES";
        $l_ldap_NO                      = "NO";
        $l_ldap_server_label            = "LDAP server :";
        $l_ldap_server_text             = "IP address of the LDAP server.";
        $l_ldap_base_dn_label           = "DN of the base:";
        $l_ldap_base_dn_text            = "The DN (Distinguished Name) is used to locate the users information in the directory.<br> e.g. LDAP : 'o=MyCompany,c=US'.<br> e.g. AD : 'cn=Users,dc=server_name,dc=localdomain'";
        $l_ldap_uid_label               = "User IDentifier (UID):";
        $l_ldap_uid_text                = "Key used to search for a given login identity.<br>e.g. 'uid', 'sn', etc.. For AD use 'sAMAccountName'.";
        $l_ldap_base_filter_label       = "User search filter (optional):";
        $l_ldap_base_filter_text        = "You can further limit the searched objects with additional filters.<br> For example 'objectClass=posixGroup' would result in the use of '(&amp;(uid=username)(objectClass=posixGroup))'";
        $l_ldap_user_label              = "CN of the user operated by ALCASAR:";
        $l_ldap_user_text               = "CN=Common Name. Leave blank to use anonymous binding. Mandatory for AD.<br> e.g. LDAP :'uid=Username,ou=my_lan,o=mycompany,c=US'.<br> e.g. AD : 'username' or 'cn=username,cn=Users,dc=server_name,dc=localdomain'";
        $l_ldap_password_label          = "Password:";
        $l_ldap_password_text           = "Leave blank to use anonymous binding. Mandatory for AD.";
        $l_ldap_ssl_label               = "Secure connection";
        $l_ldap_ssl_text                = "Use an encrypted connection with SSL (LDAPS)";
        $l_ldap_cert_required_label     = "Check the SSL certificate";
        $l_ldap_cert_required_text      = "Verify that the LDAP server uses a trusted certificate";
        $l_ldap_cert_label              = "SSL certificate (CA)";
        $l_ldap_cert_text               = "Certificate of the certification authority that signed the LDAP server certificate";
        $l_ldap_cert_status_cur         = "Current certificate:";
        $l_ldap_cert_status_no          = "No certificate imported";
        $l_ldap_submit                  = "Save";
        $l_ldap_test_service_failed     = "LDAP service is not reachable on that server (check IP)";
        $l_ldap_test_service_ok         = "A port 389 (636 with SSL) is open on this server";
        $l_ldap_test_connection_failed  = "LDAP connexion failed (check the LDAP service on this server)";
        $l_ldap_test_connection_ok      = "A LDAP connexion is established";
        $l_ldap_test_bind_failed        = "LDAP authentication failed (check the LDAP user and password)";
        $l_ldap_test_bind_ok            = "Successful authentication";
        $l_ldap_test_dn_failed          = "DN of the base seems to be wrong (check it)";
        $l_ldap_test_dn_ok              = "DN of the base seems to be ok";
        $l_ldap_cert_cn_diff_dn         = "Certificate CommonName (§cert_domainName§) is different from the server domain name";
        $l_ldap_error                   = "LDAP error";
        $l_ldap_entries                 = "entries in the base";
        $l_check                        = "Check this config";
        $l_checkingConf                 = "Checking this configuration...";
}

function ldap_checkServerConfig($f_ldap_server, $f_ldap_identity, $f_ldap_password, $f_ldap_basedn, $f_ldap_base_filter, $f_ldap_uid, $f_ldap_ssl, $f_ldap_cert, $f_ldap_cert_required) {
        // Socket to the LDAP port of the server
        if (!$sock = @fsockopen($f_ldap_server, (($f_ldap_ssl) ? 636 : 389), $num, $error, 2)) {
                // no network connection
                return -2;
        }
        fclose($sock);

        // Set LDAP SSL options
        if ($f_ldap_ssl) {
                if ($f_ldap_cert_required) {
                        if ($f_ldap_cert) {
                                ldap_set_option(NULL, LDAP_OPT_X_TLS_CACERTFILE, $f_ldap_cert);
                        }
                        ldap_set_option(NULL, LDAP_OPT_X_TLS_REQUIRE_CERT, LDAP_OPT_X_TLS_DEMAND);

                } else {
                        ldap_set_option(NULL, LDAP_OPT_X_TLS_REQUIRE_CERT, LDAP_OPT_X_TLS_NEVER);
                }
        }

        // if ok, Test LDAP connection
        $ldapconn = @ldap_connect((($f_ldap_ssl)?'ldaps':'ldap').'://'.$f_ldap_server);
        if (!$ldapconn) {
                // LDAP connection failed
                return -1;
        }

        ldap_set_option($ldapconn, LDAP_OPT_TIMELIMIT, 2);

        // if ok, test a ldap-bind with the user used by ALCASAR
        $ldapbind = @ldap_bind($ldapconn, $f_ldap_identity, $f_ldap_password);
        if (!$ldapbind) {
                // Test LDAP Version 3
                ldap_set_option($ldapconn, LDAP_OPT_PROTOCOL_VERSION, 3);
                $ldapbind = @ldap_bind($ldapconn, $f_ldap_identity, $f_ldap_password);
                if (!$ldapbind) {
                        // LDAP Bind failed
                        return 0;
                }
        }

        // if ok, try to query the directory of users
        $filter = ((!empty($f_ldap_base_filter)) ? $f_ldap_base_filter : '&');
        $query = "(&($f_ldap_uid=*)($filter))";
        $ldap_result = @ldap_search($ldapconn, $f_ldap_basedn, $query);
        if ($ldap_result) {
                $ldap_users_count = ldap_count_entries($ldapconn, $ldap_result);
                return ($ldap_users_count + 2);
        } else {
                return 1;
        }
        ldap_unbind($ldapconn);
}

$messages = '';
$LDAPS_CERT_LOC = '/etc/raddb/certs/alcasar-ldaps.crt';

if (isset($_POST['auth_enable'])) {
        if ($_POST['auth_enable'] === '1') {
                // TODO : need to translate messages
                $varErrors = [];
                if (isset($_POST['ldap_server']))        $ldap_server        = $_POST['ldap_server'];        else array_push($varErrors, 'Variable error "ldap_server"');
                if (isset($_POST['ldap_base_dn']))       $ldap_base_dn       = $_POST['ldap_base_dn'];       else array_push($varErrors, 'Variable error "ldap_base_dn"');
                if (isset($_POST['ldap_uid']))           $ldap_uid           = $_POST['ldap_uid'];           else array_push($varErrors, 'Variable error "ldap_uid"');
                if (isset($_POST['ldap_base_filter']))   $ldap_base_filter   = $_POST['ldap_base_filter'];   else array_push($varErrors, 'Variable error "ldap_base_filter"');
                if (isset($_POST['ldap_user']))          $ldap_user          = $_POST['ldap_user'];          else array_push($varErrors, 'Variable error "ldap_user"');
                if (isset($_POST['ldap_password']))      $ldap_password      = $_POST['ldap_password'];      else array_push($varErrors, 'Variable error "ldap_password"');
                if (isset($_POST['ldap_ssl']))           $ldap_ssl           = $_POST['ldap_ssl'];           //else array_push($varErrors, 'Variable error "ldap_ssl"');
                if (isset($_FILES['ldap_cert']))         $ldap_cert          = $_FILES['ldap_cert'];         //else array_push($varErrors, 'Variable error "ldap_cert"');
                if (isset($_POST['ldap_cert_required'])) $ldap_cert_required = $_POST['ldap_cert_required']; //else array_push($varErrors, 'Variable error "ldap_cert_required"');

                if (isset($ldap_cert) && ($ldap_cert['error'] === UPLOAD_ERR_OK)) {
                        if ($ldap_cert_required === 'on') {
                                $certificateInfos = openssl_x509_parse(file_get_contents($ldap_cert['tmp_name']));
                                if (preg_match_all('@/[a-zA-Z]+=([^/]+)@', $certificateInfos['name'], $matches)) {
                                        $cert_domainName = implode('.', array_reverse($matches[1]));
                                        if ($cert_domainName !== $ldap_server) {
                                                array_push($varErrors, str_replace("§cert_domainName§", $cert_domainName, $l_ldap_cert_cn_diff_dn));
                                        }
                                }
                        }
                }

                if (!empty($varErrors)) { 
                        foreach ($varErrors as $error) {
                                $messages .= '<span style="font-weight: bold; color: red;">'.$error.'</span><br>';
                        }
                } else {
                        exec('sed -i '.escapeshellarg("s/^LDAP_SERVER=.*/LDAP_SERVER=$ldap_server/g").' '.CONF_FILE);
                        exec('sed -i '.escapeshellarg("s/^LDAP_BASE=.*/LDAP_BASE=$ldap_base_dn/g").' '.CONF_FILE);
                        exec('sed -i '.escapeshellarg("s/^LDAP_UID=.*/LDAP_UID=$ldap_uid/g").' '.CONF_FILE);
                        exec('sed -i '.escapeshellarg("s/^LDAP_FILTER=.*/LDAP_FILTER=$ldap_base_filter/g").' '.CONF_FILE);
                        exec('sed -i '.escapeshellarg("s/^LDAP_USER=.*/LDAP_USER=$ldap_user/g").' '.CONF_FILE);
                        exec('sed -i '.escapeshellarg("s/^LDAP_PASSWORD=.*/LDAP_PASSWORD=$ldap_password/g").' '.CONF_FILE);
                        exec('sed -i '.escapeshellarg("s/^LDAP_SSL=.*/LDAP_SSL=$ldap_ssl/g").' '.CONF_FILE);
                        exec('sed -i '.escapeshellarg("s/^LDAP_CERT_REQUIRED=.*/LDAP_CERT_REQUIRED=$ldap_cert_required/g").' '.CONF_FILE);
                        exec('sed -i \'s/^LDAP=.*/LDAP=on/g\' '.CONF_FILE);
                        if (isset($ldap_cert) && ($ldap_cert['error'] === UPLOAD_ERR_OK)) {
                                exec('sudo /usr/local/bin/alcasar-ldap.sh --import-cert '.escapeshellarg($ldap_cert['tmp_name']));
                        }
                        exec('sudo /usr/local/bin/alcasar-ldap.sh --on');
                        $messages .= '<span style="font-weight: bold; color: green;">'.$l_ldap_update.'</span><br>';
                }
        } else {
                exec('sed -i "s/^LDAP=.*/LDAP=off/g" '.CONF_FILE);
                exec('sudo /usr/local/bin/alcasar-ldap.sh --off');
                $messages .= '<span style="font-weight: bold; color: green;">'.$l_ldap_update.'</span><br>';
        }

        // Reload configuration
        $file_conf = fopen(CONF_FILE, 'r');
        if (!$file_conf) {
                exit('Error opening the file '.CONF_FILE);
        }
        while (!feof($file_conf)) {
                $buffer = fgets($file_conf, 4096);
                if ((strpos($buffer, '=') !== false) && (substr($buffer, 0, 1) !== '#')) {
                        $tmp = explode('=', $buffer, 2);
                        $conf[trim($tmp[0])] = trim($tmp[1]);
                }
        }
        fclose($file_conf);
}

// LDAP configuration params
$ldap_status        = ($conf['LDAP'] === 'on');
$ldap_server        = $conf['LDAP_SERVER'];
$ldap_user          = $conf['LDAP_USER'];
$ldap_password      = $conf['LDAP_PASSWORD'];
$ldap_base_dn       = $conf['LDAP_BASE'];
$ldap_uid           = $conf['LDAP_UID'];
$ldap_base_filter   = $conf['LDAP_FILTER'];
$ldap_ssl           = ($conf['LDAP_SSL'] === 'on');
$ldap_cert_required = ($conf['LDAP_CERT_REQUIRED'] === 'on');

$ldap_cert_subject = NULL;
if (file_exists($LDAPS_CERT_LOC)) {
        $certificateInfos = openssl_x509_parse(file_get_contents($LDAPS_CERT_LOC));
        if (preg_match_all('@/[a-zA-Z]+=([^/]+)@', $certificateInfos['name'], $matches)) {
                $ldap_cert_subject = implode('.', array_reverse($matches[1]));
        }
}

// AJAX LDAP configuration checker
if (isset($_GET['conf_check'])) {
        $response = [
                'enable' => $ldap_status
        ];
        if ($ldap_status || ($_SERVER['REQUEST_METHOD'] === 'POST')) {
                $varErrors = [];
                if ($_SERVER['REQUEST_METHOD'] === 'POST') {
                        // TODO : need to translate messages
                        if (isset($_POST['ldap_server']))        $ldap_server        = $_POST['ldap_server'];                   else array_push($varErrors, 'Variable error "ldap_server"');
                        if (isset($_POST['ldap_base_dn']))       $ldap_base_dn       = $_POST['ldap_base_dn'];                  else array_push($varErrors, 'Variable error "ldap_base_dn"');
                        if (isset($_POST['ldap_uid']))           $ldap_uid           = $_POST['ldap_uid'];                      else array_push($varErrors, 'Variable error "ldap_uid"');
                        if (isset($_POST['ldap_base_filter']))   $ldap_base_filter   = $_POST['ldap_base_filter'];              else array_push($varErrors, 'Variable error "ldap_base_filter"');
                        if (isset($_POST['ldap_user']))          $ldap_user          = $_POST['ldap_user'];                     else array_push($varErrors, 'Variable error "ldap_user"');
                        if (isset($_POST['ldap_password']))      $ldap_password      = $_POST['ldap_password'];                 else array_push($varErrors, 'Variable error "ldap_password"');
                        if (isset($_POST['ldap_ssl']))           $ldap_ssl           = ($_POST['ldap_ssl'] === 'on');           //else array_push($varErrors, 'Variable error "ldap_ssl"');
                        if (isset($_FILES['ldap_cert']))         $ldap_cert          = $_FILES['ldap_cert'];                    //else array_push($varErrors, 'Variable error "ldap_cert"');
                        if (isset($_POST['ldap_cert_required'])) $ldap_cert_required = ($_POST['ldap_cert_required'] === 'on'); //else array_push($varErrors, 'Variable error "ldap_cert_required"');
                }

                if (($ldap_cert_required) && isset($ldap_cert) && ($ldap_cert['error'] === UPLOAD_ERR_OK)) {
                        $ldap_cert_tmpFilename = $ldap_cert['tmp_name'];
                } else {
                        $ldap_cert_tmpFilename = NULL;
                }

                if (!empty($varErrors)) {
                        $response['errors'] = $varErrors;
                } else {
                        $result = ldap_checkServerConfig($ldap_server, $ldap_user, $ldap_password, $ldap_base_dn, $ldap_base_filter, $ldap_uid, $ldap_ssl, $ldap_cert_tmpFilename, $ldap_cert_required);

                        if (($result === 0) && ($ldap_ssl && $ldap_cert_required && ((isset($ldap_cert) && ($ldap_cert['error'] === UPLOAD_ERR_OK)) || (file_exists($LDAPS_CERT_LOC))))) {
                                if (filter_var($ldap_server, FILTER_VALIDATE_IP) !== false) {
                                        if (isset($ldap_cert) && ($ldap_cert['error'] === UPLOAD_ERR_OK)) {
                                                $certificateInfos = openssl_x509_parse(file_get_contents($ldap_cert['tmp_name']));
                                        } else {
                                                $certificateInfos = openssl_x509_parse(file_get_contents($LDAPS_CERT_LOC));
                                        }
                                        if (preg_match_all('@/[a-zA-Z]+=([^/]+)@', $certificateInfos['name'], $matches)) {
                                                $cert_domainName = implode('.', array_reverse($matches[1]));
                                                if ($cert_domainName !== $ldap_server) {
                                                        $response['warnings'][] = str_replace("§cert_domainName§", $cert_domainName, $l_ldap_cert_cn_diff_dn);
                                                }
                                        }
                                        $res = ldap_checkServerConfig($cert_domainName, $ldap_user, $ldap_password, $ldap_base_dn, $ldap_base_filter, $ldap_uid, $ldap_ssl, $ldap_cert_tmpFilename, $ldap_cert_required);
                                        if ($res > 1) {
                                                $result = $res;
                                        }
                                        $result = max($result, $res);
                                }
                        }

                        $response['result'] = $result;
                }
        }

        header('Content-Type: application/json');
        echo json_encode($response);
        exit();
}

?>
<!DOCTYPE html>
<html>
<head>
        <meta charset="UTF-8">
        <title><?= $l_ldap_title ?></title>
        <link type="text/css" href="/css/style.css" rel="stylesheet">
        <link type="text/css" href="/css/acc.css" rel="stylesheet">
        <link type="text/css" href="/css/ldap.css" rel="stylesheet">
        <script>
        function onLdapStatusChange() {
                var listToDisables = ['ldap_server', 'ldap_dn', 'ldap_uid', 'ldap_base_filter', 'ldap_user', 'ldap_password', 'ldap_ssl', 'ldap_cert_required', 'ldap_cert'];
                var formSubmit = document.querySelector('form input[type="submit"]');
                var btn_checkConf = document.getElementById('btn-checkconf');
                var isChecked = false;

                if (document.getElementById('auth_enable').value === '1') {
                        for (var i=0; i<listToDisables.length; i++) {
                                document.getElementById(listToDisables[i]).style.backgroundColor = null;
                                document.getElementById(listToDisables[i]).disabled = false;
                        }
                        if (document.getElementById('ldap_ssl').value === 'off') {
                                document.getElementById('ldap_cert_required').style.backgroundColor = '#c0c0c0';
                                document.getElementById('ldap_cert_required').disabled = true;
                                document.getElementById('ldap_cert').style.backgroundColor = '#c0c0c0';
                                document.getElementById('ldap_cert').disabled = true;
                        }
                        else if (document.getElementById('ldap_cert_required').value === 'off') {
                                document.getElementById('ldap_cert').style.backgroundColor = '#c0c0c0';
                                document.getElementById('ldap_cert').disabled = true;
                        }
                        formSubmit.style.display = 'none';
                        btn_checkConf.style.display = null;
                        <?php if (PHP_VERSION_ID < 70100): ?>
                        // Compatibility with PHP < 7.1.0 # TODO : remove if ever Mageia 7 is released
                        formSubmit.style.display = null;
                        <?php endif; ?>
                } else {
                        for (var i=0; i<listToDisables.length; i++) {
                                document.getElementById(listToDisables[i]).style.backgroundColor = '#c0c0c0';
                                document.getElementById(listToDisables[i]).disabled = true;
                        }
                        formSubmit.style.display = null;
                        btn_checkConf.style.display = 'none';
                }
        }

        function checkConfig() {
                var messagesElem = document.querySelector('fieldset > legend > div');
                var formSubmit   = document.querySelector('form input[type="submit"]');
                var btn_checkConf = document.getElementById('btn-checkconf');
                var form = document.getElementById('form-config_ldap');
                var post_data = new FormData(form);
                post_data.delete('auth_enable');

                messagesElem.innerHTML = '<?= $l_checkingConf ?>';

                var xhr = new XMLHttpRequest();
                xhr.onreadystatechange = function() {
                        if (this.readyState == 4) {
                                if (this.status == 200) {
                                        var data = JSON.parse(this.responseText);

                                        var messages = '';

                                        if (typeof data.result !== 'undefined') {
                                                if (data.result === -2) {
                                                        messages += "<span style=\"color: red\"><?= $l_ldap_test_service_failed ?></span>";
                                                } else {
                                                        messages += "<span style=\"color: green\"><?= $l_ldap_test_service_ok ?></span>";
                                                        if (data.result === -1) {
                                                                messages += "<br><span style=\"color: red\"><?= $l_ldap_test_connection_failed ?></span>";
                                                        } else {
                                                                messages += "<br><span style=\"color: green\"><?= $l_ldap_test_connection_ok ?></span>";
                                                                if (data.result === 0) {
                                                                        messages += "<br><span style=\"color: red\"><?= $l_ldap_test_bind_failed ?></span>";
                                                                } else {
                                                                        messages += "<br><span style=\"color: green\"><?= $l_ldap_test_bind_ok ?></span>";
                                                                        if (data.result === 1) {
                                                                                messages += "<br><span style=\"color: red\"><?= $l_ldap_test_dn_failed ?></span>";
                                                                        } else {
                                                                                messages += "<br><span style=\"color: green\"><?= $l_ldap_test_dn_ok ?> (" + (data.result - 2) + " <?= $l_ldap_entries?>)</span>";
                                                                        }
                                                                }
                                                        }
                                                }
                                        }

                                        if (data.result > 1) {
                                                formSubmit.style.display = null;
                                                btn_checkConf.style.display = 'none';
                                        } else {
                                                formSubmit.style.display = 'none';
                                                btn_checkConf.style.display = null;
                                        }
                                        <?php if (PHP_VERSION_ID < 70100): ?>
                                        // Compatibility with PHP < 7.1.0 # TODO : remove if ever Mageia 7 is released
                                        formSubmit.style.display = null;
                                        <?php endif; ?>

                                        if (typeof data.errors !== 'undefined') {
                                                messages = '<span style=\"color: red\">' + data.errors.join('</span><br><span style=\"color: red\">') + '</span><br>';
                                        }
                                        if (typeof data.warnings !== 'undefined') {
                                                messages += '<br><span style=\"color: orange\">' + data.warnings.join('</span><br><span style=\"color: orange\">') + '</span><br>';
                                        }

                                        messagesElem.innerHTML = messages;
                                } else {
                                        messagesElem.innerHTML = 'server error';
                                }
                        }
                };
                xhr.open('POST', 'ldap.php?conf_check', true);
                xhr.send(post_data);
        }
        </script>
</head>
<body onLoad="onLdapStatusChange();">
        <div class="panel">
                <div class="panel-header"><?= $l_ldap_legend ?></div>
                <div class="panel-body">
                        <form id="form-config_ldap" name="config_ldap" method="POST" action="<?= htmlspecialchars($_SERVER['PHP_SELF']) ?>" enctype="multipart/form-data">
                                <fieldset>
                                        <legend>
                                                <br>
                                                <div style="text-align: center">
                                                        <?php if ($messages): ?>
                                                                <?= $messages ?>
                                                        <?php endif; ?>
                                                </div>
                                        </legend>
                                        <dl>
                                                <dt>
                                                        <label for="auth_enable"><?= $l_ldap_auth_enable_label ?></label>
                                                </dt>
                                                <dd>
                                                        <select id="auth_enable" name="auth_enable" onchange="onLdapStatusChange();">
                                                                <option value="1"<?= ($ldap_status)  ? ' selected="selected"' : '' ?>><?= $l_ldap_YES ?></option>
                                                                <option value="0"<?= (!$ldap_status) ? ' selected="selected"' : '' ?>><?= $l_ldap_NO ?></option>
                                                        </select>
                                                </dd>
                                        </dl>
                                        <dl>
                                                <dt>
                                                        <label for="ldap_server"><?= $l_ldap_server_label ?></label><br>
                                                        <?= $l_ldap_server_text ?>
                                                </dt>
                                                <dd>
                                                        <input type="text" id="ldap_server" size="40" name="ldap_server" value="<?= htmlspecialchars($ldap_server) ?>" oninput="onLdapStatusChange();">
                                                </dd>
                                        </dl>
                                        <dl>
                                                <dt>
                                                        <label for="ldap_dn"><?= $l_ldap_base_dn_label ?></label><br>
                                                        <?= $l_ldap_base_dn_text ?>
                                                </dt>
                                                <dd>
                                                        <input type="text" id="ldap_dn" size="40" name="ldap_base_dn" value="<?= htmlspecialchars($ldap_base_dn) ?>" oninput="onLdapStatusChange();">
                                                </dd>
                                        </dl>
                                        <dl>
                                                <dt>
                                                        <label for="ldap_uid"><?= $l_ldap_uid_label ?></label><br>
                                                        <?= $l_ldap_uid_text ?>
                                                </dt>
                                                <dd>
                                                        <input type="text" id="ldap_uid" size="40" name="ldap_uid" value="<?= htmlspecialchars($ldap_uid) ?>" oninput="onLdapStatusChange();">
                                                </dd>
                                        </dl>
                                        <dl>
                                                <dt>
                                                        <label for="ldap_base_filter"><?= $l_ldap_base_filter_label ?></label><br>
                                                        <?= $l_ldap_base_filter_text ?>
                                                </dt>
                                                <dd>
                                                        <input type="text" id="ldap_base_filter" size="40" name="ldap_base_filter" value="<?= htmlspecialchars($ldap_base_filter) ?>" oninput="onLdapStatusChange();">
                                                </dd>
                                        </dl>
                                        <dl>
                                                <dt>
                                                        <label for="ldap_user"><?= $l_ldap_user_label ?></label><br>
                                                        <?= $l_ldap_user_text ?>
                                                </dt>
                                                <dd>
                                                        <input type="text" id="ldap_user" size="40" name="ldap_user" value="<?= htmlspecialchars($ldap_user) ?>" oninput="onLdapStatusChange();">
                                                </dd>
                                        </dl>
                                        <dl>
                                                <dt>
                                                        <label for="ldap_password"><?= $l_ldap_password_label ?></label><br>
                                                        <?= $l_ldap_password_text ?>
                                                </dt>
                                                <dd>
                                                        <input type="password" id="ldap_password" size="40" name="ldap_password" value="<?= htmlspecialchars($ldap_password) ?>" oninput="onLdapStatusChange();">
                                                </dd>
                                        </dl>
                                        <dl>
                                                <dt>
                                                        <label for="ldap_ssl"><?= $l_ldap_ssl_label ?></label><br>
                                                        <?= $l_ldap_ssl_text ?><br>
                                                </dt>
                                                <dd>
                                                        <select id="ldap_ssl" name="ldap_ssl" onchange="onLdapStatusChange();">
                                                                <option value="on"<?= ($ldap_ssl)  ? ' selected="selected"' : '' ?>><?= $l_ldap_YES ?></option>
                                                                <option value="off"<?= (!$ldap_ssl) ? ' selected="selected"' : '' ?>><?= $l_ldap_NO ?></option>
                                                        </select>
                                                </dd>
                                        </dl>
                                        <dl>
                                                <dt>
                                                        <label for="ldap_cert_required"><?= $l_ldap_cert_required_label ?></label><br>
                                                        <?= $l_ldap_cert_required_text ?><br>
                                                </dt>
                                                <dd>
                                                        <select id="ldap_cert_required" name="ldap_cert_required" onchange="onLdapStatusChange();">
                                                                <option value="on"<?= ($ldap_cert_required)  ? ' selected="selected"' : '' ?>><?= $l_ldap_YES ?></option>
                                                                <option value="off"<?= (!$ldap_cert_required) ? ' selected="selected"' : '' ?>><?= $l_ldap_NO ?></option>
                                                        </select>
                                                </dd>
                                        </dl>
                                        <dl>
                                                <dt>
                                                        <label for="ldap_cert"><?= $l_ldap_cert_label ?></label><br>
                                                        <?= $l_ldap_cert_text ?><br>
                                                        <?= (($ldap_cert_subject) ? "$l_ldap_cert_status_cur $ldap_cert_subject" : $l_ldap_cert_status_no ) ?>
                                                </dt>
                                                <dd>
                                                        <input type="file" id="ldap_cert" name="ldap_cert" oninput="onLdapStatusChange();">
                                                </dd>
                                        </dl>
                                        <p>
                                                <button id="btn-checkconf" onclick="checkConfig(); return false;"><?= $l_check ?></button>
                                                <input id="submit" type="submit" value="<?= $l_ldap_submit ?>" name="submit">
                                        </p>
                                </fieldset>
                        </form>
                </div>
        </div>
</body>
</html>