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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Auth
  * @subpackage Zend_Auth_Adapter
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 /**
  * @see Zend_Auth_Adapter_Interface
  */
 // require_once 'Zend/Auth/Adapter/Interface.php';
 
 /**
  * @category   Zend
  * @package    Zend_Auth
  * @subpackage Zend_Auth_Adapter
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Auth_Adapter_Ldap implements Zend_Auth_Adapter_Interface
 {
 
     /**
      * The Zend_Ldap context.
      *
      * @var Zend_Ldap
      */
     protected $_ldap = null;
 
     /**
      * The array of arrays of Zend_Ldap options passed to the constructor.
      *
      * @var array
      */
     protected $_options = null;
 
     /**
      * The username of the account being authenticated.
      *
      * @var string
      */
     protected $_username = null;
 
     /**
      * The password of the account being authenticated.
      *
      * @var string
      */
     protected $_password = null;
 
     /**
      * The DN of the authenticated account. Used to retrieve the account entry on request.
      *
      * @var string
      */
     protected $_authenticatedDn = null;
 
     /**
      * Constructor
      *
      * @param  array  $options  An array of arrays of Zend_Ldap options
      * @param  string $username The username of the account being authenticated
      * @param  string $password The password of the account being authenticated
      */
     public function __construct(array $options = array(), $username = null, $password = null)
     {
         $this->setOptions($options);
         if ($username !== null) {
             $this->setUsername($username);
         }
         if ($password !== null) {
             $this->setPassword($password);
         }
     }
 
     /**
      * Returns the array of arrays of Zend_Ldap options of this adapter.
      *
      * @return array|null
      */
     public function getOptions()
     {
         return $this->_options;
     }
 
     /**
      * Sets the array of arrays of Zend_Ldap options to be used by
      * this adapter.
      *
      * @param  array $options The array of arrays of Zend_Ldap options
      * @return Zend_Auth_Adapter_Ldap Provides a fluent interface
      */
     public function setOptions($options)
     {
         $this->_options = is_array($options) ? $options : array();
         return $this;
     }
 
     /**
      * Returns the username of the account being authenticated, or
      * NULL if none is set.
      *
      * @return string|null
      */
     public function getUsername()
     {
         return $this->_username;
     }
 
     /**
      * Sets the username for binding
      *
      * @param  string $username The username for binding
      * @return Zend_Auth_Adapter_Ldap Provides a fluent interface
      */
     public function setUsername($username)
     {
         $this->_username = (string) $username;
         return $this;
     }
 
     /**
      * Returns the password of the account being authenticated, or
      * NULL if none is set.
      *
      * @return string|null
      */
     public function getPassword()
     {
         return $this->_password;
     }
 
     /**
      * Sets the passwort for the account
      *
      * @param  string $password The password of the account being authenticated
      * @return Zend_Auth_Adapter_Ldap Provides a fluent interface
      */
     public function setPassword($password)
     {
         $this->_password = (string) $password;
         return $this;
     }
 
     /**
      * setIdentity() - set the identity (username) to be used
      *
      * Proxies to {@see setUsername()}
      *
      * Closes ZF-6813
      *
      * @param  string $identity
      * @return Zend_Auth_Adapter_Ldap Provides a fluent interface
      */
     public function setIdentity($identity)
     {
         return $this->setUsername($identity);
     }
 
     /**
      * setCredential() - set the credential (password) value to be used
      *
      * Proxies to {@see setPassword()}
      *
      * Closes ZF-6813
      *
      * @param  string $credential
      * @return Zend_Auth_Adapter_Ldap Provides a fluent interface
      */
     public function setCredential($credential)
     {
         return $this->setPassword($credential);
     }
 
     /**
      * Returns the LDAP Object
      *
      * @return Zend_Ldap The Zend_Ldap object used to authenticate the credentials
      */
     public function getLdap()
     {
         if ($this->_ldap === null) {
             /**
              * @see Zend_Ldap
              */
             // require_once 'Zend/Ldap.php';
             $this->_ldap = new Zend_Ldap();
         }
 
         return $this->_ldap;
     }
 
     /**
      * Set an Ldap connection
      *
      * @param Zend_Ldap $ldap An existing Ldap object
      * @return Zend_Auth_Adapter_Ldap Provides a fluent interface
      */
     public function setLdap(Zend_Ldap $ldap)
     {
         $this->_ldap = $ldap;
 
         $this->setOptions(array($ldap->getOptions()));
 
         return $this;
     }
 
     /**
      * Returns a domain name for the current LDAP options. This is used
      * for skipping redundant operations (e.g. authentications).
      *
      * @return string
      */
     protected function _getAuthorityName()
     {
         $options = $this->getLdap()->getOptions();
         $name = $options['accountDomainName'];
         if (!$name)
             $name = $options['accountDomainNameShort'];
         return $name ? $name : '';
     }
 
     /**
      * Authenticate the user
      *
      * @throws Zend_Auth_Adapter_Exception
      * @return Zend_Auth_Result
      */
     public function authenticate()
     {
         /**
          * @see Zend_Ldap_Exception
          */
         // require_once 'Zend/Ldap/Exception.php';
 
         $messages = array();
         $messages[0] = ''; // reserved
         $messages[1] = ''; // reserved
 
         $username = $this->_username;
         $password = $this->_password;
 
         if (!$username) {
             $code = Zend_Auth_Result::FAILURE_IDENTITY_NOT_FOUND;
             $messages[0] = 'A username is required';
             return new Zend_Auth_Result($code, '', $messages);
         }
         if (!$password) {
             /* A password is required because some servers will
              * treat an empty password as an anonymous bind.
              */
             $code = Zend_Auth_Result::FAILURE_CREDENTIAL_INVALID;
             $messages[0] = 'A password is required';
             return new Zend_Auth_Result($code, '', $messages);
         }
 
         $ldap = $this->getLdap();
 
         $code = Zend_Auth_Result::FAILURE;
         $messages[0] = "Authority not found: $username";
         $failedAuthorities = array();
 
         /* Iterate through each server and try to authenticate the supplied
          * credentials against it.
          */
         foreach ($this->_options as $name => $options) {
 
             if (!is_array($options)) {
                 /**
                  * @see Zend_Auth_Adapter_Exception
                  */
                 // require_once 'Zend/Auth/Adapter/Exception.php';
                 throw new Zend_Auth_Adapter_Exception('Adapter options array not an array');
             }
             $adapterOptions = $this->_prepareOptions($ldap, $options);
             $dname = '';
 
             try {
                 if ($messages[1])
                     $messages[] = $messages[1];
                 $messages[1] = '';
                 $messages[] = $this->_optionsToString($options);
 
                 $dname = $this->_getAuthorityName();
                 if (isset($failedAuthorities[$dname])) {
                     /* If multiple sets of server options for the same domain
                      * are supplied, we want to skip redundant authentications
                      * where the identity or credentials where found to be
                      * invalid with another server for the same domain. The
                      * $failedAuthorities array tracks this condition (and also
                      * serves to supply the original error message).
                      * This fixes issue ZF-4093.
                      */
                     $messages[1] = $failedAuthorities[$dname];
                     $messages[] = "Skipping previously failed authority: $dname";
                     continue;
                 }
 
                 $canonicalName = $ldap->getCanonicalAccountName($username);
                 $ldap->bind($canonicalName, $password);
                 /*
                  * Fixes problem when authenticated user is not allowed to retrieve
                  * group-membership information or own account.
                  * This requires that the user specified with "username" and optionally
                  * "password" in the Zend_Ldap options is able to retrieve the required
                  * information.
                  */
                 $requireRebind = false;
                 if (isset($options['username'])) {
                     $ldap->bind();
                     $requireRebind = true;
                 }
                 $dn = $ldap->getCanonicalAccountName($canonicalName, Zend_Ldap::ACCTNAME_FORM_DN);
 
                 $groupResult = $this->_checkGroupMembership($ldap, $canonicalName, $dn, $adapterOptions);
                 if ($groupResult === true) {
                     $this->_authenticatedDn = $dn;
                     $messages[0] = '';
                     $messages[1] = '';
                     $messages[] = "$canonicalName authentication successful";
                     if ($requireRebind === true) {
                         // rebinding with authenticated user
                         $ldap->bind($dn, $password);
                     }
                     return new Zend_Auth_Result(Zend_Auth_Result::SUCCESS, $canonicalName, $messages);
                 } else {
                     $messages[0] = 'Account is not a member of the specified group';
                     $messages[1] = $groupResult;
                     $failedAuthorities[$dname] = $groupResult;
                 }
             } catch (Zend_Ldap_Exception $zle) {
 
                 /* LDAP based authentication is notoriously difficult to diagnose. Therefore
                  * we bend over backwards to capture and record every possible bit of
                  * information when something goes wrong.
                  */
 
                 $err = $zle->getCode();
 
                 if ($err == Zend_Ldap_Exception::LDAP_X_DOMAIN_MISMATCH) {
                     /* This error indicates that the domain supplied in the
                      * username did not match the domains in the server options
                      * and therefore we should just skip to the next set of
                      * server options.
                      */
                     continue;
                 } else if ($err == Zend_Ldap_Exception::LDAP_NO_SUCH_OBJECT) {
                     $code = Zend_Auth_Result::FAILURE_IDENTITY_NOT_FOUND;
                     $messages[0] = "Account not found: $username";
                     $failedAuthorities[$dname] = $zle->getMessage();
                 } else if ($err == Zend_Ldap_Exception::LDAP_INVALID_CREDENTIALS) {
                     $code = Zend_Auth_Result::FAILURE_CREDENTIAL_INVALID;
                     $messages[0] = 'Invalid credentials';
                     $failedAuthorities[$dname] = $zle->getMessage();
                 } else {
                     $line = $zle->getLine();
                     $messages[] = $zle->getFile() . "($line): " . $zle->getMessage();
                     $messages[] = preg_replace(
             '/\b'.preg_quote(substr($password, 0, 15), '/').'\b/',
             '*****',
             $zle->getTraceAsString()
           );
                     $messages[0] = 'An unexpected failure occurred';
                 }
                 $messages[1] = $zle->getMessage();
             }
         }
 
         $msg = isset($messages[1]) ? $messages[1] : $messages[0];
         $messages[] = "$username authentication failed: $msg";
 
         return new Zend_Auth_Result($code, $username, $messages);
     }
 
     /**
      * Sets the LDAP specific options on the Zend_Ldap instance
      *
      * @param  Zend_Ldap $ldap
      * @param  array $options
      * @return array of auth-adapter specific options
      */
     protected function _prepareOptions(Zend_Ldap $ldap, array $options)
     {
         $adapterOptions = array(
             'group'       => null,
             'groupDn'     => $ldap->getBaseDn(),
             'groupScope'  => Zend_Ldap::SEARCH_SCOPE_SUB,
             'groupAttr'   => 'cn',
             'groupFilter' => 'objectClass=groupOfUniqueNames',
             'memberAttr'  => 'uniqueMember',
             'memberIsDn'  => true
         );
         foreach ($adapterOptions as $key => $value) {
             if (array_key_exists($key, $options)) {
                 $value = $options[$key];
                 unset($options[$key]);
                 switch ($key) {
                     case 'groupScope':
                         $value = (int)$value;
                         if (in_array($value, array(Zend_Ldap::SEARCH_SCOPE_BASE,
                                 Zend_Ldap::SEARCH_SCOPE_ONE, Zend_Ldap::SEARCH_SCOPE_SUB), true)) {
                            $adapterOptions[$key] = $value;
                         }
                         break;
                     case 'memberIsDn':
                         $adapterOptions[$key] = ($value === true ||
                                 $value === '1' || strcasecmp($value, 'true') == 0);
                         break;
                     default:
                         $adapterOptions[$key] = trim($value);
                         break;
                 }
             }
         }
         $ldap->setOptions($options);
         return $adapterOptions;
     }
 
     /**
      * Checks the group membership of the bound user
      *
      * @param  Zend_Ldap $ldap
      * @param  string    $canonicalName
      * @param  string    $dn
      * @param  array     $adapterOptions
      * @return string|true
      */
     protected function _checkGroupMembership(Zend_Ldap $ldap, $canonicalName, $dn, array $adapterOptions)
     {
         if ($adapterOptions['group'] === null) {
             return true;
         }
 
         if ($adapterOptions['memberIsDn'] === false) {
             $user = $canonicalName;
         } else {
             $user = $dn;
         }
 
         /**
          * @see Zend_Ldap_Filter
          */
         // require_once 'Zend/Ldap/Filter.php';
         $groupName = Zend_Ldap_Filter::equals($adapterOptions['groupAttr'], $adapterOptions['group']);
         $membership = Zend_Ldap_Filter::equals($adapterOptions['memberAttr'], $user);
         $group = Zend_Ldap_Filter::andFilter($groupName, $membership);
         $groupFilter = $adapterOptions['groupFilter'];
         if (!empty($groupFilter)) {
             $group = $group->addAnd($groupFilter);
         }
 
         $result = $ldap->count($group, $adapterOptions['groupDn'], $adapterOptions['groupScope']);
 
         if ($result === 1) {
             return true;
         } else {
             return 'Failed to verify group membership with ' . $group->toString();
         }
     }
 
     /**
      * getAccountObject() - Returns the result entry as a stdClass object
      *
      * This resembles the feature {@see Zend_Auth_Adapter_DbTable::getResultRowObject()}.
      * Closes ZF-6813
      *
      * @param  array $returnAttribs
      * @param  array $omitAttribs
      * @return stdClass|boolean
      */
     public function getAccountObject(array $returnAttribs = array(), array $omitAttribs = array())
     {
         if (!$this->_authenticatedDn) {
             return false;
         }
 
         $returnObject = new stdClass();
 
         $returnAttribs = array_map('strtolower', $returnAttribs);
         $omitAttribs   = array_map('strtolower', $omitAttribs);
         $returnAttribs = array_diff($returnAttribs, $omitAttribs);
 
         $entry = $this->getLdap()->getEntry($this->_authenticatedDn, $returnAttribs, true);
         foreach ($entry as $attr => $value) {
             if (in_array($attr, $omitAttribs)) {
                 // skip attributes marked to be omitted
                 continue;
             }
             if (is_array($value)) {
                 $returnObject->$attr = (count($value) > 1) ? $value : $value[0];
             } else {
                 $returnObject->$attr = $value;
             }
         }
         return $returnObject;
     }
 
     /**
      * Converts options to string
      *
      * @param  array $options
      * @return string
      */
     private function _optionsToString(array $options)
     {
         $str = '';
         foreach ($options as $key => $val) {
             if ($key === 'password')
                 $val = '*****';
             if ($str)
                 $str .= ',';
             $str .= $key . '=' . $val;
         }
         return $str;
     }
 }