(Theoretically) allow users to change their passwords.

I cannot test this... but I hope it works :-)

plugins/LdapAuthentication/LdapAuthenticationPlugin.php

@@ -46,6 +46,7 @@ class LdapAuthenticationPlugin extends AuthenticationPlugin
     public $options=null;
     public $filter=null;
     public $scope=null;
+    public $password_encoding=null;
     public $attributes=array();
 
     function onInitializePlugin(){
@@ -68,10 +69,6 @@ class LdapAuthenticationPlugin extends AuthenticationPlugin
 
     function checkPassword($username, $password)
     {
-        $ldap = $this->ldap_get_connection();
-        if(!$ldap){
-            return false;
-        }
         $entry = $this->ldap_get_user($username);
         if(!$entry){
             return false;
@@ -109,8 +106,38 @@ class LdapAuthenticationPlugin extends AuthenticationPlugin
 
     function changePassword($username,$oldpassword,$newpassword)
     {
-        //TODO implement this
+        if(! isset($this->attributes['password']) || !isset($this->password_encoding)){
-        throw new Exception(_('Sorry, changing LDAP passwords is not supported at this time'));
+            //throw new Exception(_('Sorry, changing LDAP passwords is not supported at this time'));
+            return false;
+        }
+        $entry = $this->ldap_get_user($username);
+        if(!$entry){
+            return false;
+        }else{
+            $config = $this->ldap_get_config();
+            $config['binddn']=$entry->dn();
+            $config['bindpw']=$oldpassword;
+            if($ldap = $this->ldap_get_connection($config)){
+                $entry = $this->ldap_get_user($username,array(),$ldap);
+                
+                $newCryptedPassword = $this->hashPassword($newpassword, $this->password_encoding);
+                if ($newCryptedPassword===false) {
+                    return false;
+                }
+                if($this->password_encoding=='ad') {
+                    //TODO I believe this code will work once this bug is fixed: http://pear.php.net/bugs/bug.php?id=16796
+                    $oldCryptedPassword = $this->hashPassword($oldpassword, $this->password_encoding);
+                    $entry->delete( array($this->attributes['password'] => $oldCryptedPassword ));
+                }
+                $entry->replace( array($this->attributes['password'] => $newCryptedPassword ), true);
+                if( Net_LDAP2::isError($entry->upate()) ) {
+                    return false;
+                }
+                return true;
+            }else{
+                return false;
+            }
+        }
 
         return false;
     }
@@ -153,8 +180,10 @@ class LdapAuthenticationPlugin extends AuthenticationPlugin
      * $param array $attributes LDAP attributes to retrieve
      * @return string DN
      */
-    function ldap_get_user($username,$attributes=array()){
+    function ldap_get_user($username,$attributes=array(),$ldap=null){
+        if($ldap==null) {
             $ldap = $this->ldap_get_connection();
+        }
         $filter = Net_LDAP2_Filter::create($this->attributes['username'], 'equals',  $username);
         $options = array(
             'scope' => 'sub',
@@ -177,4 +206,123 @@ class LdapAuthenticationPlugin extends AuthenticationPlugin
             return false;
         }
     }
+    
+    /**
+     * Code originaly from the phpLDAPadmin development team
+     * http://phpldapadmin.sourceforge.net/
+     *
+     * Hashes a password and returns the hash based on the specified enc_type.
+     *
+     * @param string $passwordClear The password to hash in clear text.
+     * @param string $encodageType Standard LDAP encryption type which must be one of
+     *        crypt, ext_des, md5crypt, blowfish, md5, sha, smd5, ssha, or clear.
+     * @return string The hashed password.
+     *
+     */
+
+    function hashPassword( $passwordClear, $encodageType ) 
+    {
+        $encodageType = strtolower( $encodageType );
+        switch( $encodageType ) {
+            case 'crypt': 
+                $cryptedPassword = '{CRYPT}' . crypt($passwordClear,$this->randomSalt(2)); 
+                break;
+                
+            case 'ext_des':
+                // extended des crypt. see OpenBSD crypt man page.
+                if ( ! defined( 'CRYPT_EXT_DES' ) || CRYPT_EXT_DES == 0 ) {return FALSE;} //Your system crypt library does not support extended DES encryption.
+                $cryptedPassword = '{CRYPT}' . crypt( $passwordClear, '_' . $this->randomSalt(8) );
+                break;
+
+            case 'md5crypt':
+                if( ! defined( 'CRYPT_MD5' ) || CRYPT_MD5 == 0 ) {return FALSE;} //Your system crypt library does not support md5crypt encryption.
+                $cryptedPassword = '{CRYPT}' . crypt( $passwordClear , '$1$' . $this->randomSalt(9) );
+                break;
+
+            case 'blowfish':
+                if( ! defined( 'CRYPT_BLOWFISH' ) || CRYPT_BLOWFISH == 0 ) {return FALSE;} //Your system crypt library does not support blowfish encryption.
+                $cryptedPassword = '{CRYPT}' . crypt( $passwordClear , '$2a$12$' . $this->randomSalt(13) ); // hardcoded to second blowfish version and set number of rounds
+                break;
+
+            case 'md5':
+                $cryptedPassword = '{MD5}' . base64_encode( pack( 'H*' , md5( $passwordClear) ) );
+                break;
+
+            case 'sha':
+                if( function_exists('sha1') ) {
+                    // use php 4.3.0+ sha1 function, if it is available.
+                    $cryptedPassword = '{SHA}' . base64_encode( pack( 'H*' , sha1( $passwordClear) ) );
+                } elseif( function_exists( 'mhash' ) ) {
+                    $cryptedPassword = '{SHA}' . base64_encode( mhash( MHASH_SHA1, $passwordClear) );
+                } else {
+                    return FALSE; //Your PHP install does not have the mhash() function. Cannot do SHA hashes.
+                }
+                break;
+
+            case 'ssha':
+                if( function_exists( 'mhash' ) && function_exists( 'mhash_keygen_s2k' ) ) {
+                    mt_srand( (double) microtime() * 1000000 );
+                    $salt = mhash_keygen_s2k( MHASH_SHA1, $passwordClear, substr( pack( "h*", md5( mt_rand() ) ), 0, 8 ), 4 );
+                    $cryptedPassword = "{SSHA}".base64_encode( mhash( MHASH_SHA1, $passwordClear.$salt ).$salt );
+                } else {
+                    return FALSE; //Your PHP install does not have the mhash() function. Cannot do SHA hashes.
+                }
+                break;
+
+            case 'smd5':
+                if( function_exists( 'mhash' ) && function_exists( 'mhash_keygen_s2k' ) ) {
+                    mt_srand( (double) microtime() * 1000000 );
+                    $salt = mhash_keygen_s2k( MHASH_MD5, $passwordClear, substr( pack( "h*", md5( mt_rand() ) ), 0, 8 ), 4 );
+                    $cryptedPassword = "{SMD5}".base64_encode( mhash( MHASH_MD5, $passwordClear.$salt ).$salt );
+                } else {
+                    return FALSE; //Your PHP install does not have the mhash() function. Cannot do SHA hashes.
+                }
+                break;
+
+            case 'ad':
+                $cryptedPassword = '';
+                $passwordClear = "\"" . $passwordClear . "\"";
+                $len = strlen($passwordClear);
+                for ($i = 0; $i < $len; $i++) {
+                    $cryptedPassword .= "{$passwordClear{$i}}\000";
+                }
+
+            case 'clear':
+            default:
+                $cryptedPassword = $passwordClear;
+        }
+
+        return $cryptedPassword;
+    }
+
+    /**
+     * Code originaly from the phpLDAPadmin development team
+     * http://phpldapadmin.sourceforge.net/
+     *
+     * Used to generate a random salt for crypt-style passwords. Salt strings are used
+     * to make pre-built hash cracking dictionaries difficult to use as the hash algorithm uses
+     * not only the user's password but also a randomly generated string. The string is
+     * stored as the first N characters of the hash for reference of hashing algorithms later.
+     *
+     * --- added 20021125 by bayu irawan <bayuir@divnet.telkom.co.id> ---
+     * --- ammended 20030625 by S C Rigler <srigler@houston.rr.com> ---
+     *
+     * @param int $length The length of the salt string to generate.
+     * @return string The generated salt string.
+     */
+     
+    function randomSalt( $length ) 
+    {
+        $possible = '0123456789'.
+            'abcdefghijklmnopqrstuvwxyz'.
+            'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.
+            './';
+        $str = "";
+        mt_srand((double)microtime() * 1000000);
+
+        while( strlen( $str ) < $length )
+            $str .= substr( $possible, ( rand() % strlen( $possible ) ), 1 );
+
+        return $str;
+    }
 }

plugins/LdapAuthentication/README

@@ -18,6 +18,9 @@ email_changeable (true): Are users allowed to change their email address?
     (true or false)
 password_changeable (true): Are users allowed to change their passwords?
     (true or false)
+password_encoding: required if users are to be able to change their passwords
+    Possible values are: crypt, ext_des, md5crypt, blowfish, md5, sha, ssha,
+        smd5, ad, clear
 
 host*: LDAP server name to connect to. You can provide several hosts in an
     array in which case the hosts are tried from left to right.
@@ -47,6 +50,7 @@ attributes: an array that relates StatusNet user attributes to LDAP ones
     fullname
     homepage
     location
+    password: required if users are to be able to change their passwords
 
 * required
 default values are in (parenthesis)
@@ -67,10 +71,12 @@ addPlugin('ldapAuthentication', array(
     'bindpw'=>'password',
     'basedn'=>'OU=Users,OU=StatusNet,OU=US,DC=americas,DC=global,DC=loc',
     'host'=>array('server1', 'server2'),
+    'password_encoding'=>'ad',
     'attributes'=>array(
         'username'=>'sAMAccountName',
         'nickname'=>'sAMAccountName',
         'email'=>'mail',
-        'fullname'=>'displayName')
+        'fullname'=>'displayName',
+        'password'=>'unicodePwd')
 ));