Dokuwiki module for Elgg 1.7

1 files changed, 1099 insertions, 0 deletions

diff --git a/lib/dokuwiki/inc/auth.php b/lib/dokuwiki/inc/auth.php
new file mode 100644
index 000000000..587e7c4e6
--- /dev/null
+++ b/lib/dokuwiki/inc/auth.php
@@ -0,0 +1,1099 @@
+<?php
+/**
+ * Authentication library
+ *
+ * Including this file will automatically try to login
+ * a user by calling auth_login()
+ *
+ * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
+ * @author     Andreas Gohr <andi@splitbrain.org>
+ */
+
+if(!defined('DOKU_INC')) die('meh.');
+require_once(DOKU_INC.'inc/common.php');
+require_once(DOKU_INC.'inc/io.php');
+
+// some ACL level defines
+define('AUTH_NONE',0);
+define('AUTH_READ',1);
+define('AUTH_EDIT',2);
+define('AUTH_CREATE',4);
+define('AUTH_UPLOAD',8);
+define('AUTH_DELETE',16);
+define('AUTH_ADMIN',255);
+
+global $conf;
+
+if($conf['useacl']){
+    require_once(DOKU_INC.'inc/blowfish.php');
+    require_once(DOKU_INC.'inc/mail.php');
+
+    global $auth;
+
+    // load the the backend auth functions and instantiate the auth object
+    if (@file_exists(DOKU_INC.'inc/auth/'.$conf['authtype'].'.class.php')) {
+        require_once(DOKU_INC.'inc/auth/basic.class.php');
+        require_once(DOKU_INC.'inc/auth/'.$conf['authtype'].'.class.php');
+
+        $auth_class = "auth_".$conf['authtype'];
+        if (class_exists($auth_class)) {
+            $auth = new $auth_class();
+            if ($auth->success == false) {
+                // degrade to unauthenticated user
+                unset($auth);
+                auth_logoff();
+                msg($lang['authtempfail'], -1);
+            }
+        } else {
+            nice_die($lang['authmodfailed']);
+        }
+    } else {
+        nice_die($lang['authmodfailed']);
+    }
+}
+
+// do the login either by cookie or provided credentials
+if($conf['useacl']){
+    if($auth){
+        if (!isset($_REQUEST['u'])) $_REQUEST['u'] = '';
+        if (!isset($_REQUEST['p'])) $_REQUEST['p'] = '';
+        if (!isset($_REQUEST['r'])) $_REQUEST['r'] = '';
+        $_REQUEST['http_credentials'] = false;
+        if (!$conf['rememberme']) $_REQUEST['r'] = false;
+
+        // streamline HTTP auth credentials (IIS/rewrite -> mod_php)
+        if(isset($_SERVER['HTTP_AUTHORIZATION'])){
+            list($_SERVER['PHP_AUTH_USER'],$_SERVER['PHP_AUTH_PW']) =
+                explode(':', base64_decode(substr($_SERVER['HTTP_AUTHORIZATION'], 6)));
+        }
+
+        // if no credentials were given try to use HTTP auth (for SSO)
+        if(empty($_REQUEST['u']) && empty($_COOKIE[DOKU_COOKIE]) && !empty($_SERVER['PHP_AUTH_USER'])){
+            $_REQUEST['u'] = $_SERVER['PHP_AUTH_USER'];
+            $_REQUEST['p'] = $_SERVER['PHP_AUTH_PW'];
+            $_REQUEST['http_credentials'] = true;
+        }
+
+        // apply cleaning
+        $_REQUEST['u'] = $auth->cleanUser($_REQUEST['u']);
+
+        if(isset($_REQUEST['authtok'])){
+            // when an authentication token is given, trust the session
+            auth_validateToken($_REQUEST['authtok']);
+        }elseif(!is_null($auth) && $auth->canDo('external')){
+            // external trust mechanism in place
+            $auth->trustExternal($_REQUEST['u'],$_REQUEST['p'],$_REQUEST['r']);
+        }else{
+            $evdata = array(
+                    'user'     => $_REQUEST['u'],
+                    'password' => $_REQUEST['p'],
+                    'sticky'   => $_REQUEST['r'],
+                    'silent'   => $_REQUEST['http_credentials'],
+                    );
+            $evt = new Doku_Event('AUTH_LOGIN_CHECK',$evdata);
+            if($evt->advise_before()){
+                auth_login($evdata['user'],
+                           $evdata['password'],
+                           $evdata['sticky'],
+                           $evdata['silent']);
+            }
+        }
+    }
+
+    //load ACL into a global array
+    global $AUTH_ACL;
+    if($auth->cando['getACL']) {
+        $AUTH_ACL = $auth->getACL();
+        //support user wildcard
+        if(isset($_SERVER['REMOTE_USER'])){
+            $AUTH_ACL = str_replace('%USER%',$_SERVER['REMOTE_USER'],$AUTH_ACL);
+            $AUTH_ACL = str_replace('@USER@',$_SERVER['REMOTE_USER'],$AUTH_ACL); //legacy
+        }
+    }
+    elseif(is_readable(DOKU_CONF.'acl.auth.php')){
+        $AUTH_ACL = file(DOKU_CONF.'acl.auth.php');
+        //support user wildcard
+        if(isset($_SERVER['REMOTE_USER'])){
+            $AUTH_ACL = str_replace('%USER%',$_SERVER['REMOTE_USER'],$AUTH_ACL);
+            $AUTH_ACL = str_replace('@USER@',$_SERVER['REMOTE_USER'],$AUTH_ACL); //legacy
+        }
+    }else{
+        $AUTH_ACL = array();
+    }
+}
+
+/**
+ * This tries to login the user based on the sent auth credentials
+ *
+ * The authentication works like this: if a username was given
+ * a new login is assumed and user/password are checked. If they
+ * are correct the password is encrypted with blowfish and stored
+ * together with the username in a cookie - the same info is stored
+ * in the session, too. Additonally a browserID is stored in the
+ * session.
+ *
+ * If no username was given the cookie is checked: if the username,
+ * crypted password and browserID match between session and cookie
+ * no further testing is done and the user is accepted
+ *
+ * If a cookie was found but no session info was availabe the
+ * blowfish encrypted password from the cookie is decrypted and
+ * together with username rechecked by calling this function again.
+ *
+ * On a successful login $_SERVER[REMOTE_USER] and $USERINFO
+ * are set.
+ *
+ * @author  Andreas Gohr <andi@splitbrain.org>
+ *
+ * @param   string  $user    Username
+ * @param   string  $pass    Cleartext Password
+ * @param   bool    $sticky  Cookie should not expire
+ * @param   bool    $silent  Don't show error on bad auth
+ * @return  bool             true on successful auth
+ */
+function auth_login($user,$pass,$sticky=false,$silent=false){
+    global $USERINFO;
+    global $conf;
+    global $lang;
+    global $auth;
+    $sticky ? $sticky = true : $sticky = false; //sanity check
+
+    if (!$auth) return false;
+
+    if(!empty($user)){
+        //usual login
+        if ($auth->checkPass($user,$pass)){
+            // make logininfo globally available
+            $_SERVER['REMOTE_USER'] = $user;
+            auth_setCookie($user,PMA_blowfish_encrypt($pass,auth_cookiesalt()),$sticky);
+            return true;
+        }else{
+            //invalid credentials - log off
+            if(!$silent) msg($lang['badlogin'],-1);
+            auth_logoff();
+            return false;
+        }
+    }else{
+        // read cookie information
+        list($user,$sticky,$pass) = auth_getCookie();
+        // get session info
+        $session = $_SESSION[DOKU_COOKIE]['auth'];
+        if($user && $pass){
+            // we got a cookie - see if we can trust it
+            if(isset($session) &&
+                    $auth->useSessionCache($user) &&
+                    ($session['time'] >= time()-$conf['auth_security_timeout']) &&
+                    ($session['user'] == $user) &&
+                    ($session['pass'] == $pass) &&  //still crypted
+                    ($session['buid'] == auth_browseruid()) ){
+                // he has session, cookie and browser right - let him in
+                $_SERVER['REMOTE_USER'] = $user;
+                $USERINFO = $session['info']; //FIXME move all references to session
+                return true;
+            }
+            // no we don't trust it yet - recheck pass but silent
+            $pass = PMA_blowfish_decrypt($pass,auth_cookiesalt());
+            return auth_login($user,$pass,$sticky,true);
+        }
+    }
+    //just to be sure
+    auth_logoff(true);
+    return false;
+}
+
+/**
+ * Checks if a given authentication token was stored in the session
+ *
+ * Will setup authentication data using data from the session if the
+ * token is correct. Will exit with a 401 Status if not.
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ * @param  string $token The authentication token
+ * @return boolean true (or will exit on failure)
+ */
+function auth_validateToken($token){
+    if(!$token || $token != $_SESSION[DOKU_COOKIE]['auth']['token']){
+        // bad token
+        header("HTTP/1.0 401 Unauthorized");
+        print 'Invalid auth token - maybe the session timed out';
+        unset($_SESSION[DOKU_COOKIE]['auth']['token']); // no second chance
+        exit;
+    }
+    // still here? trust the session data
+    global $USERINFO;
+    $_SERVER['REMOTE_USER'] = $_SESSION[DOKU_COOKIE]['auth']['user'];
+    $USERINFO = $_SESSION[DOKU_COOKIE]['auth']['info'];
+    return true;
+}
+
+/**
+ * Create an auth token and store it in the session
+ *
+ * NOTE: this is completely unrelated to the getSecurityToken() function
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ * @return string The auth token
+ */
+function auth_createToken(){
+    $token = md5(mt_rand());
+    @session_start(); // reopen the session if needed
+    $_SESSION[DOKU_COOKIE]['auth']['token'] = $token;
+    session_write_close();
+    return $token;
+}
+
+/**
+ * Builds a pseudo UID from browser and IP data
+ *
+ * This is neither unique nor unfakable - still it adds some
+ * security. Using the first part of the IP makes sure
+ * proxy farms like AOLs are stil okay.
+ *
+ * @author  Andreas Gohr <andi@splitbrain.org>
+ *
+ * @return  string  a MD5 sum of various browser headers
+ */
+function auth_browseruid(){
+    $ip   = clientIP(true);
+    $uid  = '';
+    $uid .= $_SERVER['HTTP_USER_AGENT'];
+    $uid .= $_SERVER['HTTP_ACCEPT_ENCODING'];
+    $uid .= $_SERVER['HTTP_ACCEPT_LANGUAGE'];
+    $uid .= $_SERVER['HTTP_ACCEPT_CHARSET'];
+    $uid .= substr($ip,0,strpos($ip,'.'));
+    return md5($uid);
+}
+
+/**
+ * Creates a random key to encrypt the password in cookies
+ *
+ * This function tries to read the password for encrypting
+ * cookies from $conf['metadir'].'/_htcookiesalt'
+ * if no such file is found a random key is created and
+ * and stored in this file.
+ *
+ * @author  Andreas Gohr <andi@splitbrain.org>
+ *
+ * @return  string
+ */
+function auth_cookiesalt(){
+    global $conf;
+    $file = $conf['metadir'].'/_htcookiesalt';
+    $salt = io_readFile($file);
+    if(empty($salt)){
+        $salt = uniqid(rand(),true);
+        io_saveFile($file,$salt);
+    }
+    return $salt;
+}
+
+/**
+ * Log out the current user
+ *
+ * This clears all authentication data and thus log the user
+ * off. It also clears session data.
+ *
+ * @author  Andreas Gohr <andi@splitbrain.org>
+ * @param bool $keepbc - when true, the breadcrumb data is not cleared
+ */
+function auth_logoff($keepbc=false){
+    global $conf;
+    global $USERINFO;
+    global $INFO, $ID;
+    global $auth;
+
+    // make sure the session is writable (it usually is)
+    @session_start();
+
+    if(isset($_SESSION[DOKU_COOKIE]['auth']['user']))
+        unset($_SESSION[DOKU_COOKIE]['auth']['user']);
+    if(isset($_SESSION[DOKU_COOKIE]['auth']['pass']))
+        unset($_SESSION[DOKU_COOKIE]['auth']['pass']);
+    if(isset($_SESSION[DOKU_COOKIE]['auth']['info']))
+        unset($_SESSION[DOKU_COOKIE]['auth']['info']);
+    if(!$keepbc && isset($_SESSION[DOKU_COOKIE]['bc']))
+        unset($_SESSION[DOKU_COOKIE]['bc']);
+    if(isset($_SERVER['REMOTE_USER']))
+        unset($_SERVER['REMOTE_USER']);
+    $USERINFO=null; //FIXME
+
+    if (version_compare(PHP_VERSION, '5.2.0', '>')) {
+        setcookie(DOKU_COOKIE,'',time()-600000,DOKU_REL,'',($conf['securecookie'] && is_ssl()),true);
+    }else{
+        setcookie(DOKU_COOKIE,'',time()-600000,DOKU_REL,'',($conf['securecookie'] && is_ssl()));
+    }
+
+    if($auth && $auth->canDo('logoff')){
+        $auth->logOff();
+    }
+}
+
+/**
+ * Check if a user is a manager
+ *
+ * Should usually be called without any parameters to check the current
+ * user.
+ *
+ * The info is available through $INFO['ismanager'], too
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ * @see    auth_isadmin
+ * @param  string user      - Username
+ * @param  array  groups    - List of groups the user is in
+ * @param  bool   adminonly - when true checks if user is admin
+ */
+function auth_ismanager($user=null,$groups=null,$adminonly=false){
+    global $conf;
+    global $USERINFO;
+    global $auth;
+
+    if (!$auth) return false;
+    if(is_null($user)) {
+        if (!isset($_SERVER['REMOTE_USER'])) {
+            return false;
+        } else {
+            $user = $_SERVER['REMOTE_USER'];
+        }
+    }
+    $user = $auth->cleanUser($user);
+    if(is_null($groups)) $groups = (array) $USERINFO['grps'];
+    $groups = array_map(array($auth,'cleanGroup'),$groups);
+    $user   = auth_nameencode($user);
+
+    // check username against superuser and manager
+    $superusers = explode(',', $conf['superuser']);
+    $superusers = array_unique($superusers);
+    $superusers = array_map('trim', $superusers);
+    // prepare an array containing only true values for array_map call
+    $alltrue = array_fill(0, count($superusers), true);
+    $superusers = array_map('auth_nameencode', $superusers, $alltrue);
+
+    // case insensitive?
+    if(!$auth->isCaseSensitive()){
+        $superusers = array_map('utf8_strtolower',$superusers);
+        $user       = utf8_strtolower($user);
+    }
+
+    // check user match
+    if(in_array($user, $superusers)) return true;
+
+    // check managers
+    if(!$adminonly){
+        $managers = explode(',', $conf['manager']);
+        $managers = array_unique($managers);
+        $managers = array_map('trim', $managers);
+        // prepare an array containing only true values for array_map call
+        $alltrue = array_fill(0, count($managers), true);
+        $managers = array_map('auth_nameencode', $managers, $alltrue);
+        if(!$auth->isCaseSensitive()) $managers = array_map('utf8_strtolower',$managers);
+        if(in_array($user, $managers)) return true;
+    }
+
+    // check user's groups against superuser and manager
+    if (!empty($groups)) {
+
+        //prepend groups with @ and nameencode
+        $cnt = count($groups);
+        for($i=0; $i<$cnt; $i++){
+            $groups[$i] = '@'.auth_nameencode($groups[$i]);
+            if(!$auth->isCaseSensitive()){
+                $groups[$i] = utf8_strtolower($groups[$i]);
+            }
+        }
+
+        // check groups against superuser and manager
+        foreach($superusers as $supu)
+            if(in_array($supu, $groups)) return true;
+        if(!$adminonly){
+            foreach($managers as $mana)
+                if(in_array($mana, $groups)) return true;
+        }
+    }
+
+    return false;
+}
+
+/**
+ * Check if a user is admin
+ *
+ * Alias to auth_ismanager with adminonly=true
+ *
+ * The info is available through $INFO['isadmin'], too
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ * @see auth_ismanager
+ */
+function auth_isadmin($user=null,$groups=null){
+    return auth_ismanager($user,$groups,true);
+}
+
+/**
+ * Convinience function for auth_aclcheck()
+ *
+ * This checks the permissions for the current user
+ *
+ * @author  Andreas Gohr <andi@splitbrain.org>
+ *
+ * @param  string  $id  page ID (needs to be resolved and cleaned)
+ * @return int          permission level
+ */
+function auth_quickaclcheck($id){
+    global $conf;
+    global $USERINFO;
+    # if no ACL is used always return upload rights
+    if(!$conf['useacl']) return AUTH_UPLOAD;
+    //error_log("DOKUWIKI: auth_quickaclcheck:".$_SERVER['REMOTE_USER'].":".$id.json_encode($USERINFO));
+    return auth_aclcheck($id,$_SERVER['REMOTE_USER'],$USERINFO['grps']);
+}
+
+/**
+ * Returns the maximum rights a user has for
+ * the given ID or its namespace
+ *
+ * @author  Andreas Gohr <andi@splitbrain.org>
+ *
+ * @param  string  $id     page ID (needs to be resolved and cleaned)
+ * @param  string  $user   Username
+ * @param  array   $groups Array of groups the user is in
+ * @return int             permission level
+ */
+function auth_aclcheck($id,$user,$groups){
+    global $conf;
+    global $AUTH_ACL;
+    global $auth;
+
+    // if no ACL is used always return upload rights
+    if(!$conf['useacl']) return AUTH_UPLOAD;
+    if (!$auth) return AUTH_NONE;
+
+    //make sure groups is an array
+    if(!is_array($groups)) $groups = array();
+
+    //if user is superuser or in superusergroup return 255 (acl_admin)
+    if(auth_isadmin($user,$groups)) { return AUTH_ADMIN; }
+
+    $ci = '';
+    if(!$auth->isCaseSensitive()) $ci = 'ui';
+
+    $user = $auth->cleanUser($user);
+    $groups = array_map(array($auth,'cleanGroup'),(array)$groups);
+    $user = auth_nameencode($user);
+
+    //prepend groups with @ and nameencode
+    $cnt = count($groups);
+    for($i=0; $i<$cnt; $i++){
+        $groups[$i] = '@'.auth_nameencode($groups[$i]);
+    }
+
+    $ns    = getNS($id);
+    $perm  = -1;
+
+    if($user || count($groups)){
+        //add ALL group
+        $groups[] = '@ALL';
+        //add User
+        if($user) $groups[] = $user;
+        //build regexp
+        $regexp   = join('|',$groups);
+    }else{
+        $regexp = '@ALL';
+    }
+
+    //check exact match first
+    $matches = preg_grep('/^'.preg_quote($id,'/').'\s+('.$regexp.')\s+/'.$ci,$AUTH_ACL);
+    if(count($matches)){
+        foreach($matches as $match){
+            $match = preg_replace('/#.*$/','',$match); //ignore comments
+            $acl   = preg_split('/\s+/',$match);
+            if($acl[2] > AUTH_DELETE) $acl[2] = AUTH_DELETE; //no admins in the ACL!
+            if($acl[2] > $perm){
+                $perm = $acl[2];
+            }
+        }
+        if($perm > -1){
+            //we had a match - return it
+            return $perm;
+        }
+    }
+
+    //still here? do the namespace checks
+    if($ns){
+        $path = $ns.':\*';
+    }else{
+        $path = '\*'; //root document
+    }
+
+    do{
+        $matches = preg_grep('/^'.$path.'\s+('.$regexp.')\s+/'.$ci,$AUTH_ACL);
+        if(count($matches)){
+            foreach($matches as $match){
+                $match = preg_replace('/#.*$/','',$match); //ignore comments
+                $acl   = preg_split('/\s+/',$match);
+                if($acl[2] > AUTH_DELETE) $acl[2] = AUTH_DELETE; //no admins in the ACL!
+                if($acl[2] > $perm){
+                    $perm = $acl[2];
+                }
+            }
+            //we had a match - return it
+            return $perm;
+        }
+
+        //get next higher namespace
+        $ns   = getNS($ns);
+
+        if($path != '\*'){
+            $path = $ns.':\*';
+            if($path == ':\*') $path = '\*';
+        }else{
+            //we did this already
+            //looks like there is something wrong with the ACL
+            //break here
+            msg('No ACL setup yet! Denying access to everyone.');
+            return AUTH_NONE;
+        }
+    }while(1); //this should never loop endless
+
+    //still here? return no permissions
+    return AUTH_NONE;
+}
+
+/**
+ * Encode ASCII special chars
+ *
+ * Some auth backends allow special chars in their user and groupnames
+ * The special chars are encoded with this function. Only ASCII chars
+ * are encoded UTF-8 multibyte are left as is (different from usual
+ * urlencoding!).
+ *
+ * Decoding can be done with rawurldecode
+ *
+ * @author Andreas Gohr <gohr@cosmocode.de>
+ * @see rawurldecode()
+ */
+function auth_nameencode($name,$skip_group=false){
+    global $cache_authname;
+    $cache =& $cache_authname;
+    $name  = (string) $name;
+
+    if (!isset($cache[$name][$skip_group])) {
+        if($skip_group && $name{0} =='@'){
+            $cache[$name][$skip_group] = '@'.preg_replace('/([\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\x7f])/e',
+                    "'%'.dechex(ord(substr('\\1',-1)))",substr($name,1));
+        }else{
+            $cache[$name][$skip_group] = preg_replace('/([\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\x7f])/e',
+                    "'%'.dechex(ord(substr('\\1',-1)))",$name);
+        }
+    }
+
+    return $cache[$name][$skip_group];
+}
+
+/**
+ * Create a pronouncable password
+ *
+ * @author  Andreas Gohr <andi@splitbrain.org>
+ * @link    http://www.phpbuilder.com/annotate/message.php3?id=1014451
+ *
+ * @return string  pronouncable password
+ */
+function auth_pwgen(){
+    $pw = '';
+    $c  = 'bcdfghjklmnprstvwz'; //consonants except hard to speak ones
+    $v  = 'aeiou';              //vowels
+    $a  = $c.$v;                //both
+
+    //use two syllables...
+    for($i=0;$i < 2; $i++){
+        $pw .= $c[rand(0, strlen($c)-1)];
+        $pw .= $v[rand(0, strlen($v)-1)];
+        $pw .= $a[rand(0, strlen($a)-1)];
+    }
+    //... and add a nice number
+    $pw .= rand(10,99);
+
+    return $pw;
+}
+
+/**
+ * Sends a password to the given user
+ *
+ * @author  Andreas Gohr <andi@splitbrain.org>
+ *
+ * @return bool  true on success
+ */
+function auth_sendPassword($user,$password){
+    global $conf;
+    global $lang;
+    global $auth;
+    if (!$auth) return false;
+
+    $hdrs  = '';
+    $user     = $auth->cleanUser($user);
+    $userinfo = $auth->getUserData($user);
+
+    if(!$userinfo['mail']) return false;
+
+    $text = rawLocale('password');
+    $text = str_replace('@DOKUWIKIURL@',DOKU_URL,$text);
+    $text = str_replace('@FULLNAME@',$userinfo['name'],$text);
+    $text = str_replace('@LOGIN@',$user,$text);
+    $text = str_replace('@PASSWORD@',$password,$text);
+    $text = str_replace('@TITLE@',$conf['title'],$text);
+
+    return mail_send($userinfo['name'].' <'.$userinfo['mail'].'>',
+            $lang['regpwmail'],
+            $text,
+            $conf['mailfrom']);
+}
+
+/**
+ * Register a new user
+ *
+ * This registers a new user - Data is read directly from $_POST
+ *
+ * @author  Andreas Gohr <andi@splitbrain.org>
+ *
+ * @return bool  true on success, false on any error
+ */
+function register(){
+    global $lang;
+    global $conf;
+    global $auth;
+
+    if (!$auth) return false;
+    if(!$_POST['save']) return false;
+    if(!$auth->canDo('addUser')) return false;
+
+    //clean username
+    $_POST['login'] = trim($auth->cleanUser($_POST['login']));
+
+    //clean fullname and email
+    $_POST['fullname'] = trim(preg_replace('/[\x00-\x1f:<>&%,;]+/','',$_POST['fullname']));
+    $_POST['email']    = trim(preg_replace('/[\x00-\x1f:<>&%,;]+/','',$_POST['email']));
+
+    if( empty($_POST['login']) ||
+        empty($_POST['fullname']) ||
+        empty($_POST['email']) ){
+        msg($lang['regmissing'],-1);
+        return false;
+    }
+
+    if ($conf['autopasswd']) {
+        $pass = auth_pwgen();                // automatically generate password
+    } elseif (empty($_POST['pass']) ||
+            empty($_POST['passchk'])) {
+        msg($lang['regmissing'], -1);        // complain about missing passwords
+        return false;
+    } elseif ($_POST['pass'] != $_POST['passchk']) {
+        msg($lang['regbadpass'], -1);      // complain about misspelled passwords
+        return false;
+    } else {
+        $pass = $_POST['pass'];              // accept checked and valid password
+    }
+
+    //check mail
+    if(!mail_isvalid($_POST['email'])){
+        msg($lang['regbadmail'],-1);
+        return false;
+    }
+
+    //okay try to create the user
+    if(!$auth->triggerUserMod('create', array($_POST['login'],$pass,$_POST['fullname'],$_POST['email']))){
+        msg($lang['reguexists'],-1);
+        return false;
+    }
+
+    // create substitutions for use in notification email
+    $substitutions = array(
+            'NEWUSER' => $_POST['login'],
+            'NEWNAME' => $_POST['fullname'],
+            'NEWEMAIL' => $_POST['email'],
+            );
+
+    if (!$conf['autopasswd']) {
+        msg($lang['regsuccess2'],1);
+        notify('', 'register', '', $_POST['login'], false, $substitutions);
+        return true;
+    }
+
+    // autogenerated password? then send him the password
+    if (auth_sendPassword($_POST['login'],$pass)){
+        msg($lang['regsuccess'],1);
+        notify('', 'register', '', $_POST['login'], false, $substitutions);
+        return true;
+    }else{
+        msg($lang['regmailfail'],-1);
+        return false;
+    }
+}
+
+/**
+ * Update user profile
+ *
+ * @author    Christopher Smith <chris@jalakai.co.uk>
+ */
+function updateprofile() {
+    global $conf;
+    global $INFO;
+    global $lang;
+    global $auth;
+
+    if (!$auth) return false;
+    if(empty($_POST['save'])) return false;
+    if(!checkSecurityToken()) return false;
+
+    // should not be able to get here without Profile being possible...
+    if(!$auth->canDo('Profile')) {
+        msg($lang['profna'],-1);
+        return false;
+    }
+
+    if ($_POST['newpass'] != $_POST['passchk']) {
+        msg($lang['regbadpass'], -1);      // complain about misspelled passwords
+        return false;
+    }
+
+    //clean fullname and email
+    $_POST['fullname'] = trim(preg_replace('/[\x00-\x1f:<>&%,;]+/','',$_POST['fullname']));
+    $_POST['email']    = trim(preg_replace('/[\x00-\x1f:<>&%,;]+/','',$_POST['email']));
+
+    if ((empty($_POST['fullname']) && $auth->canDo('modName')) ||
+        (empty($_POST['email']) && $auth->canDo('modMail'))) {
+        msg($lang['profnoempty'],-1);
+        return false;
+    }
+
+    if (!mail_isvalid($_POST['email']) && $auth->canDo('modMail')){
+        msg($lang['regbadmail'],-1);
+        return false;
+    }
+
+    if ($_POST['fullname'] != $INFO['userinfo']['name'] && $auth->canDo('modName')) $changes['name'] = $_POST['fullname'];
+    if ($_POST['email'] != $INFO['userinfo']['mail'] && $auth->canDo('modMail')) $changes['mail'] = $_POST['email'];
+    if (!empty($_POST['newpass']) && $auth->canDo('modPass')) $changes['pass'] = $_POST['newpass'];
+
+    if (!count($changes)) {
+        msg($lang['profnochange'], -1);
+        return false;
+    }
+
+    if ($conf['profileconfirm']) {
+        if (!$auth->checkPass($_SERVER['REMOTE_USER'], $_POST['oldpass'])) {
+            msg($lang['badlogin'],-1);
+            return false;
+        }
+    }
+
+    if ($result = $auth->triggerUserMod('modify', array($_SERVER['REMOTE_USER'], $changes))) {
+        // update cookie and session with the changed data
+        $cookie = base64_decode($_COOKIE[DOKU_COOKIE]);
+        list($user,$sticky,$pass) = explode('|',$cookie,3);
+        if ($changes['pass']) $pass = PMA_blowfish_encrypt($changes['pass'],auth_cookiesalt());
+
+        auth_setCookie($_SERVER['REMOTE_USER'],$pass,(bool)$sticky);
+        return true;
+    }
+}
+
+/**
+ * Send a  new password
+ *
+ * This function handles both phases of the password reset:
+ *
+ *   - handling the first request of password reset
+ *   - validating the password reset auth token
+ *
+ * @author Benoit Chesneau <benoit@bchesneau.info>
+ * @author Chris Smith <chris@jalakai.co.uk>
+ * @author Andreas Gohr <andi@splitbrain.org>
+ *
+ * @return bool true on success, false on any error
+ */
+function act_resendpwd(){
+    global $lang;
+    global $conf;
+    global $auth;
+
+    if(!actionOK('resendpwd')) return false;
+    if (!$auth) return false;
+
+    // should not be able to get here without modPass being possible...
+    if(!$auth->canDo('modPass')) {
+        msg($lang['resendna'],-1);
+        return false;
+    }
+
+    $token = preg_replace('/[^a-f0-9]+/','',$_REQUEST['pwauth']);
+
+    if($token){
+        // we're in token phase
+
+        $tfile = $conf['cachedir'].'/'.$token{0}.'/'.$token.'.pwauth';
+        if(!@file_exists($tfile)){
+            msg($lang['resendpwdbadauth'],-1);
+            return false;
+        }
+        $user = io_readfile($tfile);
+        @unlink($tfile);
+        $userinfo = $auth->getUserData($user);
+        if(!$userinfo['mail']) {
+            msg($lang['resendpwdnouser'], -1);
+            return false;
+        }
+
+        $pass = auth_pwgen();
+        if (!$auth->triggerUserMod('modify', array($user,array('pass' => $pass)))) {
+            msg('error modifying user data',-1);
+            return false;
+        }
+
+        if (auth_sendPassword($user,$pass)) {
+            msg($lang['resendpwdsuccess'],1);
+        } else {
+            msg($lang['regmailfail'],-1);
+        }
+        return true;
+
+    } else {
+        // we're in request phase
+
+        if(!$_POST['save']) return false;
+
+        if (empty($_POST['login'])) {
+            msg($lang['resendpwdmissing'], -1);
+            return false;
+        } else {
+            $user = trim($auth->cleanUser($_POST['login']));
+        }
+
+        $userinfo = $auth->getUserData($user);
+        if(!$userinfo['mail']) {
+            msg($lang['resendpwdnouser'], -1);
+            return false;
+        }
+
+        // generate auth token
+        $token = md5(auth_cookiesalt().$user); //secret but user based
+        $tfile = $conf['cachedir'].'/'.$token{0}.'/'.$token.'.pwauth';
+        $url = wl('',array('do'=>'resendpwd','pwauth'=>$token),true,'&');
+
+        io_saveFile($tfile,$user);
+
+        $text = rawLocale('pwconfirm');
+        $text = str_replace('@DOKUWIKIURL@',DOKU_URL,$text);
+        $text = str_replace('@FULLNAME@',$userinfo['name'],$text);
+        $text = str_replace('@LOGIN@',$user,$text);
+        $text = str_replace('@TITLE@',$conf['title'],$text);
+        $text = str_replace('@CONFIRM@',$url,$text);
+
+        if(mail_send($userinfo['name'].' <'.$userinfo['mail'].'>',
+                     $lang['regpwmail'],
+                     $text,
+                     $conf['mailfrom'])){
+            msg($lang['resendpwdconfirm'],1);
+        }else{
+            msg($lang['regmailfail'],-1);
+        }
+        return true;
+    }
+
+    return false; // never reached
+}
+
+/**
+ * Encrypts a password using the given method and salt
+ *
+ * If the selected method needs a salt and none was given, a random one
+ * is chosen.
+ *
+ * The following methods are understood:
+ *
+ *   smd5  - Salted MD5 hashing
+ *   apr1  - Apache salted MD5 hashing
+ *   md5   - Simple MD5 hashing
+ *   sha1  - SHA1 hashing
+ *   ssha  - Salted SHA1 hashing
+ *   crypt - Unix crypt
+ *   mysql - MySQL password (old method)
+ *   my411 - MySQL 4.1.1 password
+ *   kmd5  - Salted MD5 hashing as used by UNB
+ *
+ * @author  Andreas Gohr <andi@splitbrain.org>
+ * @return  string  The crypted password
+ */
+function auth_cryptPassword($clear,$method='',$salt=null){
+    global $conf;
+    if(empty($method)) $method = $conf['passcrypt'];
+
+    //prepare a salt
+    if(is_null($salt)) $salt = md5(uniqid(rand(), true));
+
+    switch(strtolower($method)){
+        case 'smd5':
+            if(defined('CRYPT_MD5') && CRYPT_MD5) return crypt($clear,'$1$'.substr($salt,0,8).'$');
+            // when crypt can't handle SMD5, falls through to pure PHP implementation
+            $magic = '1';
+        case 'apr1':
+            //from http://de.php.net/manual/en/function.crypt.php#73619 comment by <mikey_nich at hotmail dot com>
+            if(!$magic) $magic = 'apr1';
+            $salt = substr($salt,0,8);
+            $len = strlen($clear);
+            $text = $clear.'$'.$magic.'$'.$salt;
+            $bin = pack("H32", md5($clear.$salt.$clear));
+            for($i = $len; $i > 0; $i -= 16) {
+                $text .= substr($bin, 0, min(16, $i));
+            }
+            for($i = $len; $i > 0; $i >>= 1) {
+                $text .= ($i & 1) ? chr(0) : $clear{0};
+            }
+            $bin = pack("H32", md5($text));
+            for($i = 0; $i < 1000; $i++) {
+                $new = ($i & 1) ? $clear : $bin;
+                if ($i % 3) $new .= $salt;
+                if ($i % 7) $new .= $clear;
+                $new .= ($i & 1) ? $bin : $clear;
+                $bin = pack("H32", md5($new));
+            }
+            $tmp = '';
+            for ($i = 0; $i < 5; $i++) {
+                $k = $i + 6;
+                $j = $i + 12;
+                if ($j == 16) $j = 5;
+                $tmp = $bin[$i].$bin[$k].$bin[$j].$tmp;
+            }
+            $tmp = chr(0).chr(0).$bin[11].$tmp;
+            $tmp = strtr(strrev(substr(base64_encode($tmp), 2)),
+                    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
+                    "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz");
+            return '$'.$magic.'$'.$salt.'$'.$tmp;
+        case 'md5':
+            return md5($clear);
+        case 'sha1':
+            return sha1($clear);
+        case 'ssha':
+            $salt=substr($salt,0,4);
+            return '{SSHA}'.base64_encode(pack("H*", sha1($clear.$salt)).$salt);
+        case 'crypt':
+            return crypt($clear,substr($salt,0,2));
+        case 'mysql':
+            //from http://www.php.net/mysql comment by <soren at byu dot edu>
+            $nr=0x50305735;
+            $nr2=0x12345671;
+            $add=7;
+            $charArr = preg_split("//", $clear);
+            foreach ($charArr as $char) {
+                if (($char == '') || ($char == ' ') || ($char == '\t')) continue;
+                $charVal = ord($char);
+                $nr ^= ((($nr & 63) + $add) * $charVal) + ($nr << 8);
+                $nr2 += ($nr2 << 8) ^ $nr;
+                $add += $charVal;
+            }
+            return sprintf("%08x%08x", ($nr & 0x7fffffff), ($nr2 & 0x7fffffff));
+        case 'my411':
+            return '*'.sha1(pack("H*", sha1($clear)));
+        case 'kmd5':
+            $key = substr($salt, 16, 2);
+            $hash1 = strtolower(md5($key . md5($clear)));
+            $hash2 = substr($hash1, 0, 16) . $key . substr($hash1, 16);
+            return $hash2;
+        default:
+            msg("Unsupported crypt method $method",-1);
+    }
+}
+
+/**
+ * Verifies a cleartext password against a crypted hash
+ *
+ * The method and salt used for the crypted hash is determined automatically
+ * then the clear text password is crypted using the same method. If both hashs
+ * match true is is returned else false
+ *
+ * @author  Andreas Gohr <andi@splitbrain.org>
+ * @return  bool
+ */
+function auth_verifyPassword($clear,$crypt){
+    $method='';
+    $salt='';
+
+    //determine the used method and salt
+    $len = strlen($crypt);
+    if(preg_match('/^\$1\$([^\$]{0,8})\$/',$crypt,$m)){
+        $method = 'smd5';
+        $salt   = $m[1];
+    }elseif(preg_match('/^\$apr1\$([^\$]{0,8})\$/',$crypt,$m)){
+        $method = 'apr1';
+        $salt   = $m[1];
+    }elseif(substr($crypt,0,6) == '{SSHA}'){
+        $method = 'ssha';
+        $salt   = substr(base64_decode(substr($crypt, 6)),20);
+    }elseif($len == 32){
+        $method = 'md5';
+    }elseif($len == 40){
+        $method = 'sha1';
+    }elseif($len == 16){
+        $method = 'mysql';
+    }elseif($len == 41 && $crypt[0] == '*'){
+        $method = 'my411';
+    }elseif($len == 34){
+        $method = 'kmd5';
+        $salt   = $crypt;
+    }else{
+        $method = 'crypt';
+        $salt   = substr($crypt,0,2);
+    }
+
+    //crypt and compare
+    if(auth_cryptPassword($clear,$method,$salt) === $crypt){
+        return true;
+    }
+    return false;
+}
+
+/**
+ * Set the authentication cookie and add user identification data to the session
+ *
+ * @param string  $user       username
+ * @param string  $pass       encrypted password
+ * @param bool    $sticky     whether or not the cookie will last beyond the session
+ */
+function auth_setCookie($user,$pass,$sticky) {
+    global $conf;
+    global $auth;
+    global $USERINFO;
+
+    if (!$auth) return false;
+    $USERINFO = $auth->getUserData($user);
+
+    // set cookie
+    $cookie = base64_encode($user).'|'.((int) $sticky).'|'.base64_encode($pass);
+    $time = $sticky ? (time()+60*60*24*365) : 0; //one year
+    if (version_compare(PHP_VERSION, '5.2.0', '>')) {
+        setcookie(DOKU_COOKIE,$cookie,$time,DOKU_REL,'',($conf['securecookie'] && is_ssl()),true);
+    }else{
+        setcookie(DOKU_COOKIE,$cookie,$time,DOKU_REL,'',($conf['securecookie'] && is_ssl()));
+    }
+    // set session
+    $_SESSION[DOKU_COOKIE]['auth']['user'] = $user;
+    $_SESSION[DOKU_COOKIE]['auth']['pass'] = $pass;
+    $_SESSION[DOKU_COOKIE]['auth']['buid'] = auth_browseruid();
+    $_SESSION[DOKU_COOKIE]['auth']['info'] = $USERINFO;
+    $_SESSION[DOKU_COOKIE]['auth']['time'] = time();
+}
+
+/**
+ * Returns the user, (encrypted) password and sticky bit from cookie
+ *
+ * @returns array
+ */
+function auth_getCookie(){
+    if (!isset($_COOKIE[DOKU_COOKIE])) {
+        return array(null, null, null);
+    }
+    list($user,$sticky,$pass) = explode('|',$_COOKIE[DOKU_COOKIE],3);
+    $sticky = (bool) $sticky;
+    $pass   = base64_decode($pass);
+    $user   = base64_decode($user);
+    return array($user,$sticky,$pass);
+}
+
+//Setup VIM: ex: et ts=2 enc=utf-8 :