--- horde-webmail-1.2.8.orig/imp/login.php	2010-10-25 17:10:05.000000000 +0200
+++ horde-webmail-1.2.8/imp/login.php	2010-11-30 17:36:27.571023703 +0100
@@ -398,6 +398,7 @@
     $t->set('user_vinfo', Horde::callHook('_imp_hook_vinfo', array('vdomain'), 'imp'));
 }
 $t->set('password_tabindex', ++$tabindex);
+$t->set('captch_tabindex', ++$tabindex);
 
 $t->set('change_smtphost', (!empty($conf['server']['change_smtphost'])));
 if ($t->get('change_smtphost')) {
@@ -446,7 +447,16 @@
     'var imp_auth = ' . intval($imp_auth),
     'var nomenu = ' . intval(empty($conf['menu']['always'])),
 ));
-echo $t->fetch(IMP_TEMPLATES . '/login/login.html');
+
+// ZMENA
+ini_set('include_path', ini_get('include_path').':/usr/share/php');
+
+require_once 'Text/CAPTCHA/Numeral.php';
+$numcap = new Text_CAPTCHA_Numeral;
+
+echo str_replace('Vysledek', $numcap->getOperation().' =', $t->fetch(IMP_TEMPLATES . '/login/login.html'));
+$_SESSION['answer'] = $numcap->getAnswer();
+//KONEC ZMENY
 
 if (!empty($recompose_data)) {
     /* Prepare recompose template. */

--- horde-webmail-1.2.8.orig/imp/redirect.php	2010-10-25 17:10:05.000000000 +0200
+++ horde-webmail-1.2.8/imp/redirect.php	2010-11-30 17:36:27.555023948 +0100
@@ -91,6 +91,14 @@
 require_once 'Horde/Maintenance.php';
 
 $actionID = (Util::getFormData('action') == 'compose') ? 'login_compose' : Util::getFormData('actionID');
+
+$captch = Util::getFormData('captch');
+if (isset($captch) && isset($_SESSION['answer'])) {
+    if ($captch != $_SESSION['answer']) {
+            _redirect(Auth::addLogoutParameters(IMP::logoutUrl(), AUTH_REASON_FAILED));
+    }
+}
+
 $autologin = Util::getFormData('autologin');
 $imapuser = Util::getPost('imapuser');
 $pass = Util::getPost('pass');

--- horde-webmail-1.2.8.orig/imp/templates/login/login.html	2010-10-25 17:10:05.000000000 +0200
+++ horde-webmail-1.2.8/imp/templates/login/login.html	2010-11-30 17:36:27.215029139 +0100
@@ -94,6 +94,12 @@
       <input type="password" tabindex="<tag:password_tabindex />" id="pass" name="pass" style="direction:ltr" />
      </td>
     </tr>
+    <tr>
+     <td class="light rightAlign"><label for="captch"><strong><gettext>Vysledek</gettext></strong></label></td>
+     <td class="leftAlign">
+      <input type="text" tabindex="<tag:captch_tabindex />" id="captch" name="captch" style="direction:ltr" />
+     </td>
+    </tr>
 
 <if:change_smtphost>
     <tr style="height: 1em;">