xref: /dokuwiki/inc/auth.php (revision 2f07f429e76a253b463454860697a3a877032b5c) 
1<?php
2/**
3 * Authentication library
4 *
5 * Including this file will automatically try to login
6 * a user by calling auth_login()
7 *
8 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
9 * @author     Andreas Gohr <andi@splitbrain.org>
10 */
11
12  if(!defined('DOKU_INC')) define('DOKU_INC',realpath(dirname(__FILE__).'/../').'/');
13  require_once(DOKU_INC.'inc/common.php');
14  require_once(DOKU_INC.'inc/io.php');
15
16  // some ACL level defines
17  define('AUTH_NONE',0);
18  define('AUTH_READ',1);
19  define('AUTH_EDIT',2);
20  define('AUTH_CREATE',4);
21  define('AUTH_UPLOAD',8);
22  define('AUTH_DELETE',16);
23  define('AUTH_ADMIN',255);
24
25  global $conf;
26
27  if($conf['useacl']){
28    require_once(DOKU_INC.'inc/blowfish.php');
29    require_once(DOKU_INC.'inc/mail.php');
30
31    global $auth;
32
33    // load the the backend auth functions and instantiate the auth object
34    if (@file_exists(DOKU_INC.'inc/auth/'.$conf['authtype'].'.class.php')) {
35      require_once(DOKU_INC.'inc/auth/basic.class.php');
36      require_once(DOKU_INC.'inc/auth/'.$conf['authtype'].'.class.php');
37
38      $auth_class = "auth_".$conf['authtype'];
39      if (class_exists($auth_class)) {
40        $auth = new $auth_class();
41        if ($auth->success == false) {
42          unset($auth);
43          msg($lang['authtempfail'], -1);
44
45          // turn acl config setting off for the rest of this page
46          $conf['useacl'] = 0;
47        }
48      } else {
49        nice_die($lang['authmodfailed']);
50      }
51    } else {
52      nice_die($lang['authmodfailed']);
53    }
54  }
55
56  // do the login either by cookie or provided credentials
57  if($conf['useacl']){
58    if (!isset($_REQUEST['u'])) $_REQUEST['u'] = '';
59    if (!isset($_REQUEST['p'])) $_REQUEST['p'] = '';
60    if (!isset($_REQUEST['r'])) $_REQUEST['r'] = '';
61
62    // if no credentials were given try to use HTTP auth (for SSO)
63    if(empty($_REQUEST['u']) && empty($_COOKIE[DOKU_COOKIE]) && !empty($_SERVER['PHP_AUTH_USER'])){
64      $_REQUEST['u'] = $_SERVER['PHP_AUTH_USER'];
65      $_REQUEST['p'] = $_SERVER['PHP_AUTH_PW'];
66    }
67
68    // external trust mechanism in place?
69    if(!is_null($auth) && $auth->canDo('external')){
70      $auth->trustExternal($_REQUEST['u'],$_REQUEST['p'],$_REQUEST['r']);
71    }else{
72      auth_login($_REQUEST['u'],$_REQUEST['p'],$_REQUEST['r']);
73    }
74
75    //load ACL into a global array
76    global $AUTH_ACL;
77    if(is_readable(DOKU_CONF.'acl.auth.php')){
78      $AUTH_ACL = file(DOKU_CONF.'acl.auth.php');
79      if(isset($_SERVER['REMOTE_USER'])){
80        $AUTH_ACL = str_replace('@USER@',$_SERVER['REMOTE_USER'],$AUTH_ACL);
81      }
82    }else{
83      $AUTH_ACL = array();
84    }
85  }
86
87/**
88 * This tries to login the user based on the sent auth credentials
89 *
90 * The authentication works like this: if a username was given
91 * a new login is assumed and user/password are checked. If they
92 * are correct the password is encrypted with blowfish and stored
93 * together with the username in a cookie - the same info is stored
94 * in the session, too. Additonally a browserID is stored in the
95 * session.
96 *
97 * If no username was given the cookie is checked: if the username,
98 * crypted password and browserID match between session and cookie
99 * no further testing is done and the user is accepted
100 *
101 * If a cookie was found but no session info was availabe the
102 * blowfish encrypted password from the cookie is decrypted and
103 * together with username rechecked by calling this function again.
104 *
105 * On a successful login $_SERVER[REMOTE_USER] and $USERINFO
106 * are set.
107 *
108 * @author  Andreas Gohr <andi@splitbrain.org>
109 *
110 * @param   string  $user    Username
111 * @param   string  $pass    Cleartext Password
112 * @param   bool    $sticky  Cookie should not expire
113 * @param   bool    $silent  Don't show error on bad auth
114 * @return  bool             true on successful auth
115*/
116function auth_login($user,$pass,$sticky=false,$silent=false){
117  global $USERINFO;
118  global $conf;
119  global $lang;
120  global $auth;
121  $sticky ? $sticky = true : $sticky = false; //sanity check
122
123  if(!empty($user)){
124    //usual login
125    if ($auth->checkPass($user,$pass)){
126      // make logininfo globally available
127      $_SERVER['REMOTE_USER'] = $user;
128      $USERINFO = $auth->getUserData($user); //FIXME move all references to session
129
130      // set cookie
131      $pass   = PMA_blowfish_encrypt($pass,auth_cookiesalt());
132      $cookie = base64_encode("$user|$sticky|$pass");
133      if($sticky) $time = time()+60*60*24*365; //one year
134      setcookie(DOKU_COOKIE,$cookie,$time,DOKU_REL);
135
136      // set session
137      $_SESSION[DOKU_COOKIE]['auth']['user'] = $user;
138      $_SESSION[DOKU_COOKIE]['auth']['pass'] = $pass;
139      $_SESSION[DOKU_COOKIE]['auth']['buid'] = auth_browseruid();
140      $_SESSION[DOKU_COOKIE]['auth']['info'] = $USERINFO;
141      $_SESSION[DOKU_COOKIE]['auth']['time'] = time();
142
143      return true;
144    }else{
145      //invalid credentials - log off
146      if(!$silent) msg($lang['badlogin'],-1);
147      auth_logoff();
148      return false;
149    }
150  }else{
151    // read cookie information
152    $cookie = base64_decode($_COOKIE[DOKU_COOKIE]);
153    list($user,$sticky,$pass) = split('\|',$cookie,3);
154    // get session info
155    $session = $_SESSION[DOKU_COOKIE]['auth'];
156    if($user && $pass){
157      // we got a cookie - see if we can trust it
158      if(isset($session) &&
159        ($session['time'] >= time()-$conf['auth_security_timeout']) &&
160        ($session['user'] == $user) &&
161        ($session['pass'] == $pass) &&  //still crypted
162        ($session['buid'] == auth_browseruid()) ){
163        // he has session, cookie and browser right - let him in
164        $_SERVER['REMOTE_USER'] = $user;
165        $USERINFO = $session['info']; //FIXME move all references to session
166        return true;
167      }
168      // no we don't trust it yet - recheck pass but silent
169      $pass = PMA_blowfish_decrypt($pass,auth_cookiesalt());
170      return auth_login($user,$pass,$sticky,true);
171    }
172  }
173  //just to be sure
174  auth_logoff();
175  return false;
176}
177
178/**
179 * Builds a pseudo UID from browser and IP data
180 *
181 * This is neither unique nor unfakable - still it adds some
182 * security. Using the first part of the IP makes sure
183 * proxy farms like AOLs are stil okay.
184 *
185 * @author  Andreas Gohr <andi@splitbrain.org>
186 *
187 * @return  string  a MD5 sum of various browser headers
188 */
189function auth_browseruid(){
190  $uid  = '';
191  $uid .= $_SERVER['HTTP_USER_AGENT'];
192  $uid .= $_SERVER['HTTP_ACCEPT_ENCODING'];
193  $uid .= $_SERVER['HTTP_ACCEPT_LANGUAGE'];
194  $uid .= $_SERVER['HTTP_ACCEPT_CHARSET'];
195  $uid .= substr($_SERVER['REMOTE_ADDR'],0,strpos($_SERVER['REMOTE_ADDR'],'.'));
196  return md5($uid);
197}
198
199/**
200 * Creates a random key to encrypt the password in cookies
201 *
202 * This function tries to read the password for encrypting
203 * cookies from $conf['metadir'].'/_htcookiesalt'
204 * if no such file is found a random key is created and
205 * and stored in this file.
206 *
207 * @author  Andreas Gohr <andi@splitbrain.org>
208 *
209 * @return  string
210 */
211function auth_cookiesalt(){
212  global $conf;
213  $file = $conf['metadir'].'/_htcookiesalt';
214  $salt = io_readFile($file);
215  if(empty($salt)){
216    $salt = uniqid(rand(),true);
217    io_saveFile($file,$salt);
218  }
219  return $salt;
220}
221
222/**
223 * This clears all authenticationdata and thus log the user
224 * off
225 *
226 * @author  Andreas Gohr <andi@splitbrain.org>
227 */
228function auth_logoff(){
229  global $conf;
230  global $USERINFO;
231  global $INFO, $ID;
232  global $auth;
233
234  if(isset($_SESSION[DOKU_COOKIE]['auth']['user']))
235    unset($_SESSION[DOKU_COOKIE]['auth']['user']);
236  if(isset($_SESSION[DOKU_COOKIE]['auth']['pass']))
237    unset($_SESSION[DOKU_COOKIE]['auth']['pass']);
238  if(isset($_SESSION[DOKU_COOKIE]['auth']['info']))
239    unset($_SESSION[DOKU_COOKIE]['auth']['info']);
240  if(isset($_SERVER['REMOTE_USER']))
241    unset($_SERVER['REMOTE_USER']);
242  $USERINFO=null; //FIXME
243  setcookie(DOKU_COOKIE,'',time()-600000,DOKU_REL);
244
245  if($auth && $auth->canDo('logoff')){
246    $auth->logOff();
247  }
248}
249
250/**
251 * Check if a user is a manager
252 *
253 * Should usually be called without any parameters to check the current
254 * user.
255 *
256 * The info is available through $INFO['ismanager'], too
257 *
258 * @author Andreas Gohr <andi@splitbrain.org>
259 * @see    auth_isadmin
260 * @param  string user      - Username
261 * @param  array  groups    - List of groups the user is in
262 * @param  bool   adminonly - when true checks if user is admin
263 */
264function auth_ismanager($user=null,$groups=null,$adminonly=false){
265  global $conf;
266  global $USERINFO;
267
268  if(!$conf['useacl']) return false;
269  if(is_null($user))   $user   = $_SERVER['REMOTE_USER'];
270  if(is_null($groups)) $groups = $USERINFO['grps'];
271  $user   = auth_nameencode($user);
272
273  // check username against superuser and manager
274  if(auth_nameencode($conf['superuser']) == $user) return true;
275  if(!$adminonly){
276    if(auth_nameencode($conf['manager']) == $user) return true;
277  }
278
279  //prepend groups with @ and nameencode
280  $cnt = count($groups);
281  for($i=0; $i<$cnt; $i++){
282    $groups[$i] = '@'.auth_nameencode($groups[$i]);
283  }
284
285  // check groups against superuser and manager
286  if(in_array(auth_nameencode($conf['superuser'],true), $groups)) return true;
287  if(!$adminonly){
288    if(in_array(auth_nameencode($conf['manager'],true), $groups)) return true;
289  }
290  return false;
291}
292
293/**
294 * Check if a user is admin
295 *
296 * Alias to auth_ismanager with adminonly=true
297 *
298 * The info is available through $INFO['isadmin'], too
299 *
300 * @author Andreas Gohr <andi@splitbrain.org>
301 * @see auth_ismanager
302 */
303function auth_isadmin($user=null,$groups=null){
304  return auth_ismanager($user,$groups,true);
305}
306
307/**
308 * Convinience function for auth_aclcheck()
309 *
310 * This checks the permissions for the current user
311 *
312 * @author  Andreas Gohr <andi@splitbrain.org>
313 *
314 * @param  string  $id  page ID
315 * @return int          permission level
316 */
317function auth_quickaclcheck($id){
318  global $conf;
319  global $USERINFO;
320  # if no ACL is used always return upload rights
321  if(!$conf['useacl']) return AUTH_UPLOAD;
322  return auth_aclcheck($id,$_SERVER['REMOTE_USER'],$USERINFO['grps']);
323}
324
325/**
326 * Returns the maximum rights a user has for
327 * the given ID or its namespace
328 *
329 * @author  Andreas Gohr <andi@splitbrain.org>
330 *
331 * @param  string  $id     page ID
332 * @param  string  $user   Username
333 * @param  array   $groups Array of groups the user is in
334 * @return int             permission level
335 */
336function auth_aclcheck($id,$user,$groups){
337  global $conf;
338  global $AUTH_ACL;
339
340  # if no ACL is used always return upload rights
341  if(!$conf['useacl']) return AUTH_UPLOAD;
342
343  $user = auth_nameencode($user);
344
345  //if user is superuser return 255 (acl_admin)
346  if(auth_nameencode($conf['superuser']) == $user) { return AUTH_ADMIN; }
347
348  //make sure groups is an array
349  if(!is_array($groups)) $groups = array();
350
351  //prepend groups with @ and nameencode
352  $cnt = count($groups);
353  for($i=0; $i<$cnt; $i++){
354    $groups[$i] = '@'.auth_nameencode($groups[$i]);
355  }
356  //if user is in superuser group return 255 (acl_admin)
357  if(in_array(auth_nameencode($conf['superuser'],true), $groups)) { return AUTH_ADMIN; }
358
359  $ns    = getNS($id);
360  $perm  = -1;
361
362  if($user){
363    //add ALL group
364    $groups[] = '@ALL';
365    //add User
366    $groups[] = $user;
367    //build regexp
368    $regexp   = join('|',$groups);
369  }else{
370    $regexp = '@ALL';
371  }
372
373  //check exact match first
374  $matches = preg_grep('/^'.preg_quote($id,'/').'\s+('.$regexp.')\s+/',$AUTH_ACL);
375  if(count($matches)){
376    foreach($matches as $match){
377      $match = preg_replace('/#.*$/','',$match); //ignore comments
378      $acl   = preg_split('/\s+/',$match);
379      if($acl[2] > AUTH_DELETE) $acl[2] = AUTH_DELETE; //no admins in the ACL!
380      if($acl[2] > $perm){
381        $perm = $acl[2];
382      }
383    }
384    if($perm > -1){
385      //we had a match - return it
386      return $perm;
387    }
388  }
389
390  //still here? do the namespace checks
391  if($ns){
392    $path = $ns.':\*';
393  }else{
394    $path = '\*'; //root document
395  }
396
397  do{
398    $matches = preg_grep('/^'.$path.'\s+('.$regexp.')\s+/',$AUTH_ACL);
399    if(count($matches)){
400      foreach($matches as $match){
401        $match = preg_replace('/#.*$/','',$match); //ignore comments
402        $acl   = preg_split('/\s+/',$match);
403        if($acl[2] > AUTH_DELETE) $acl[2] = AUTH_DELETE; //no admins in the ACL!
404        if($acl[2] > $perm){
405          $perm = $acl[2];
406        }
407      }
408      //we had a match - return it
409      return $perm;
410    }
411
412    //get next higher namespace
413    $ns   = getNS($ns);
414
415    if($path != '\*'){
416      $path = $ns.':\*';
417      if($path == ':\*') $path = '\*';
418    }else{
419      //we did this already
420      //looks like there is something wrong with the ACL
421      //break here
422      msg('No ACL setup yet! Denying access to everyone.');
423      return AUTH_NONE;
424    }
425  }while(1); //this should never loop endless
426
427  //still here? return no permissions
428  return AUTH_NONE;
429}
430
431/**
432 * Encode ASCII special chars
433 *
434 * Some auth backends allow special chars in their user and groupnames
435 * The special chars are encoded with this function. Only ASCII chars
436 * are encoded UTF-8 multibyte are left as is (different from usual
437 * urlencoding!).
438 *
439 * Decoding can be done with rawurldecode
440 *
441 * @author Andreas Gohr <gohr@cosmocode.de>
442 * @see rawurldecode()
443 */
444function auth_nameencode($name,$skip_group=false){
445  global $cache_authname;
446  $cache =& $cache_authname;
447  $name  = (string) $name;
448
449  if (!isset($cache[$name][$skip_group])) {
450    if($skip_group && $name{0} =='@'){
451      $cache[$name][$skip_group] = '@'.preg_replace('/([\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\x7f])/e',
452                                                    "'%'.dechex(ord('\\1'))",substr($name,1));
453    }else{
454      $cache[$name][$skip_group] = preg_replace('/([\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\x7f])/e',
455                                                "'%'.dechex(ord('\\1'))",$name);
456    }
457  }
458
459  return $cache[$name][$skip_group];
460}
461
462/**
463 * Create a pronouncable password
464 *
465 * @author  Andreas Gohr <andi@splitbrain.org>
466 * @link    http://www.phpbuilder.com/annotate/message.php3?id=1014451
467 *
468 * @return string  pronouncable password
469 */
470function auth_pwgen(){
471  $pw = '';
472  $c  = 'bcdfghjklmnprstvwz'; //consonants except hard to speak ones
473  $v  = 'aeiou';              //vowels
474  $a  = $c.$v;                //both
475
476  //use two syllables...
477  for($i=0;$i < 2; $i++){
478    $pw .= $c[rand(0, strlen($c)-1)];
479    $pw .= $v[rand(0, strlen($v)-1)];
480    $pw .= $a[rand(0, strlen($a)-1)];
481  }
482  //... and add a nice number
483  $pw .= rand(10,99);
484
485  return $pw;
486}
487
488/**
489 * Sends a password to the given user
490 *
491 * @author  Andreas Gohr <andi@splitbrain.org>
492 *
493 * @return bool  true on success
494 */
495function auth_sendPassword($user,$password){
496  global $conf;
497  global $lang;
498  global $auth;
499
500  $hdrs  = '';
501  $userinfo = $auth->getUserData($user);
502
503  if(!$userinfo['mail']) return false;
504
505  $text = rawLocale('password');
506  $text = str_replace('@DOKUWIKIURL@',DOKU_URL,$text);
507  $text = str_replace('@FULLNAME@',$userinfo['name'],$text);
508  $text = str_replace('@LOGIN@',$user,$text);
509  $text = str_replace('@PASSWORD@',$password,$text);
510  $text = str_replace('@TITLE@',$conf['title'],$text);
511
512  return mail_send($userinfo['name'].' <'.$userinfo['mail'].'>',
513                   $lang['regpwmail'],
514                   $text,
515                   $conf['mailfrom']);
516}
517
518/**
519 * Register a new user
520 *
521 * This registers a new user - Data is read directly from $_POST
522 *
523 * @author  Andreas Gohr <andi@splitbrain.org>
524 *
525 * @return bool  true on success, false on any error
526 */
527function register(){
528  global $lang;
529  global $conf;
530  global $auth;
531
532  if(!$_POST['save']) return false;
533  if(!$auth->canDo('addUser')) return false;
534
535  //clean username
536  $_POST['login'] = preg_replace('/.*:/','',$_POST['login']);
537  $_POST['login'] = cleanID($_POST['login']);
538  //clean fullname and email
539  $_POST['fullname'] = trim(preg_replace('/[\x00-\x1f:<>&%,;]+/','',$_POST['fullname']));
540  $_POST['email']    = trim(preg_replace('/[\x00-\x1f:<>&%,;]+/','',$_POST['email']));
541
542  if( empty($_POST['login']) ||
543      empty($_POST['fullname']) ||
544      empty($_POST['email']) ){
545    msg($lang['regmissing'],-1);
546    return false;
547  }
548
549  if ($conf['autopasswd']) {
550    $pass = auth_pwgen();                // automatically generate password
551  } elseif (empty($_POST['pass']) ||
552            empty($_POST['passchk'])) {
553    msg($lang['regmissing'], -1);        // complain about missing passwords
554    return false;
555  } elseif ($_POST['pass'] != $_POST['passchk']) {
556    msg($lang['regbadpass'], -1);      // complain about misspelled passwords
557    return false;
558  } else {
559    $pass = $_POST['pass'];              // accept checked and valid password
560  }
561
562  //check mail
563  if(!mail_isvalid($_POST['email'])){
564    msg($lang['regbadmail'],-1);
565    return false;
566  }
567
568  //okay try to create the user
569  if(!$auth->createUser($_POST['login'],$pass,$_POST['fullname'],$_POST['email'])){
570    msg($lang['reguexists'],-1);
571    return false;
572  }
573
574  // create substitutions for use in notification email
575  $substitutions = array(
576    'NEWUSER' => $_POST['login'],
577    'NEWNAME' => $_POST['fullname'],
578    'NEWEMAIL' => $_POST['email'],
579  );
580
581  if (!$conf['autopasswd']) {
582    msg($lang['regsuccess2'],1);
583    notify('', 'register', '', $_POST['login'], false, $substitutions);
584    return true;
585  }
586
587  // autogenerated password? then send him the password
588  if (auth_sendPassword($_POST['login'],$pass)){
589    msg($lang['regsuccess'],1);
590    notify('', 'register', '', $_POST['login'], false, $substitutions);
591    return true;
592  }else{
593    msg($lang['regmailfail'],-1);
594    return false;
595  }
596}
597
598/**
599 * Update user profile
600 *
601 * @author    Christopher Smith <chris@jalakai.co.uk>
602 */
603function updateprofile() {
604  global $conf;
605  global $INFO;
606  global $lang;
607  global $auth;
608
609  if(empty($_POST['save'])) return false;
610
611  // should not be able to get here without Profile being possible...
612  if(!$auth->canDo('Profile')) {
613    msg($lang['profna'],-1);
614    return false;
615  }
616
617  if ($_POST['newpass'] != $_POST['passchk']) {
618    msg($lang['regbadpass'], -1);      // complain about misspelled passwords
619    return false;
620  }
621
622  //clean fullname and email
623  $_POST['fullname'] = trim(preg_replace('/[\x00-\x1f:<>&%,;]+/','',$_POST['fullname']));
624  $_POST['email']    = trim(preg_replace('/[\x00-\x1f:<>&%,;]+/','',$_POST['email']));
625
626  if (empty($_POST['fullname']) || empty($_POST['email'])) {
627    msg($lang['profnoempty'],-1);
628    return false;
629  }
630
631  if (!mail_isvalid($_POST['email'])){
632    msg($lang['regbadmail'],-1);
633    return false;
634  }
635
636  if ($_POST['fullname'] != $INFO['userinfo']['name']) $changes['name'] = $_POST['fullname'];
637  if ($_POST['email']    != $INFO['userinfo']['mail']) $changes['mail'] = $_POST['email'];
638  if (!empty($_POST['newpass']))  $changes['pass'] = $_POST['newpass'];
639
640  if (!count($changes)) {
641    msg($lang['profnochange'], -1);
642    return false;
643  }
644
645  if ($conf['profileconfirm']) {
646      if (!auth_verifyPassword($_POST['oldpass'],$INFO['userinfo']['pass'])) {
647      msg($lang['badlogin'],-1);
648      return false;
649    }
650  }
651
652  return $auth->modifyUser($_SERVER['REMOTE_USER'], $changes);
653}
654
655/**
656 * Send a  new password
657 *
658 * This function handles both phases of the password reset:
659 *
660 *   - handling the first request of password reset
661 *   - validating the password reset auth token
662 *
663 * @author Benoit Chesneau <benoit@bchesneau.info>
664 * @author Chris Smith <chris@jalakai.co.uk>
665 * @author Andreas Gohr <andi@splitbrain.org>
666 *
667 * @return bool true on success, false on any error
668*/
669function act_resendpwd(){
670    global $lang;
671    global $conf;
672    global $auth;
673
674    if(!actionOK('resendpwd')) return false;
675
676    // should not be able to get here without modPass being possible...
677    if(!$auth->canDo('modPass')) {
678        msg($lang['resendna'],-1);
679        return false;
680    }
681
682    $token = preg_replace('/[^a-f0-9]+/','',$_REQUEST['pwauth']);
683
684    if($token){
685        // we're in token phase
686
687        $tfile = $conf['cachedir'].'/'.$token{0}.'/'.$token.'.pwauth';
688        if(!@file_exists($tfile)){
689            msg($lang['resendpwdbadauth'],-1);
690            return false;
691        }
692        $user = io_readfile($tfile);
693        @unlink($tfile);
694        $userinfo = $auth->getUserData($user);
695        if(!$userinfo['mail']) {
696            msg($lang['resendpwdnouser'], -1);
697            return false;
698        }
699
700        $pass = auth_pwgen();
701        if (!$auth->modifyUser($user,array('pass' => $pass))) {
702            msg('error modifying user data',-1);
703            return false;
704        }
705
706        if (auth_sendPassword($user,$pass)) {
707            msg($lang['resendpwdsuccess'],1);
708        } else {
709            msg($lang['regmailfail'],-1);
710        }
711        return true;
712
713    } else {
714        // we're in request phase
715
716        if(!$_POST['save']) return false;
717
718        if (empty($_POST['login'])) {
719            msg($lang['resendpwdmissing'], -1);
720            return false;
721        } else {
722            $_POST['login'] = preg_replace('/.*:/','',$_POST['login']);
723            $user = cleanID($_POST['login']);
724        }
725
726        $userinfo = $auth->getUserData($user);
727        if(!$userinfo['mail']) {
728            msg($lang['resendpwdnouser'], -1);
729            return false;
730        }
731
732        // generate auth token
733        $token = md5(auth_cookiesalt().$user); //secret but user based
734        $tfile = $conf['cachedir'].'/'.$token{0}.'/'.$token.'.pwauth';
735        $url = wl('',array('do'=>'resendpwd','pwauth'=>$token),true,'&');
736
737        io_saveFile($tfile,$user);
738
739        $text = rawLocale('pwconfirm');
740        $text = str_replace('@DOKUWIKIURL@',DOKU_URL,$text);
741        $text = str_replace('@FULLNAME@',$userinfo['name'],$text);
742        $text = str_replace('@LOGIN@',$user,$text);
743        $text = str_replace('@TITLE@',$conf['title'],$text);
744        $text = str_replace('@CONFIRM@',$url,$text);
745
746        if(mail_send($userinfo['name'].' <'.$userinfo['mail'].'>',
747                     $lang['regpwmail'],
748                     $text,
749                     $conf['mailfrom'])){
750            msg($lang['resendpwdconfirm'],1);
751        }else{
752            msg($lang['regmailfail'],-1);
753        }
754        return true;
755    }
756
757    return false; // never reached
758}
759
760/**
761 * Uses a regular expresion to check if a given mail address is valid
762 *
763 * May not be completly RFC conform!
764 *
765 * @link    http://www.webmasterworld.com/forum88/135.htm
766 *
767 * @param   string $email the address to check
768 * @return  bool          true if address is valid
769 */
770function isvalidemail($email){
771  return eregi("^[0-9a-z]([-_.]?[0-9a-z])*@[0-9a-z]([-.]?[0-9a-z])*\\.[a-z]{2,4}$", $email);
772}
773
774/**
775 * Encrypts a password using the given method and salt
776 *
777 * If the selected method needs a salt and none was given, a random one
778 * is chosen.
779 *
780 * The following methods are understood:
781 *
782 *   smd5  - Salted MD5 hashing
783 *   md5   - Simple MD5 hashing
784 *   sha1  - SHA1 hashing
785 *   ssha  - Salted SHA1 hashing
786 *   crypt - Unix crypt
787 *   mysql - MySQL password (old method)
788 *   my411 - MySQL 4.1.1 password
789 *
790 * @author  Andreas Gohr <andi@splitbrain.org>
791 * @return  string  The crypted password
792 */
793function auth_cryptPassword($clear,$method='',$salt=''){
794  global $conf;
795  if(empty($method)) $method = $conf['passcrypt'];
796
797  //prepare a salt
798  if(empty($salt)) $salt = md5(uniqid(rand(), true));
799
800  switch(strtolower($method)){
801    case 'smd5':
802        return crypt($clear,'$1$'.substr($salt,0,8).'$');
803    case 'md5':
804      return md5($clear);
805    case 'sha1':
806      return sha1($clear);
807    case 'ssha':
808      $salt=substr($salt,0,4);
809      return '{SSHA}'.base64_encode(pack("H*", sha1($clear.$salt)).$salt);
810    case 'crypt':
811      return crypt($clear,substr($salt,0,2));
812    case 'mysql':
813      //from http://www.php.net/mysql comment by <soren at byu dot edu>
814      $nr=0x50305735;
815      $nr2=0x12345671;
816      $add=7;
817      $charArr = preg_split("//", $clear);
818      foreach ($charArr as $char) {
819        if (($char == '') || ($char == ' ') || ($char == '\t')) continue;
820        $charVal = ord($char);
821        $nr ^= ((($nr & 63) + $add) * $charVal) + ($nr << 8);
822        $nr2 += ($nr2 << 8) ^ $nr;
823        $add += $charVal;
824      }
825      return sprintf("%08x%08x", ($nr & 0x7fffffff), ($nr2 & 0x7fffffff));
826    case 'my411':
827      return '*'.sha1(pack("H*", sha1($clear)));
828    default:
829      msg("Unsupported crypt method $method",-1);
830  }
831}
832
833/**
834 * Verifies a cleartext password against a crypted hash
835 *
836 * The method and salt used for the crypted hash is determined automatically
837 * then the clear text password is crypted using the same method. If both hashs
838 * match true is is returned else false
839 *
840 * @author  Andreas Gohr <andi@splitbrain.org>
841 * @return  bool
842 */
843function auth_verifyPassword($clear,$crypt){
844  $method='';
845  $salt='';
846
847  //determine the used method and salt
848  $len = strlen($crypt);
849  if(substr($crypt,0,3) == '$1$'){
850    $method = 'smd5';
851    $salt   = substr($crypt,3,8);
852  }elseif(substr($crypt,0,6) == '{SSHA}'){
853    $method = 'ssha';
854    $salt   = substr(base64_decode(substr($crypt, 6)),20);
855  }elseif($len == 32){
856    $method = 'md5';
857  }elseif($len == 40){
858    $method = 'sha1';
859  }elseif($len == 16){
860    $method = 'mysql';
861  }elseif($len == 41 && $crypt[0] == '*'){
862    $method = 'my411';
863  }else{
864    $method = 'crypt';
865    $salt   = substr($crypt,0,2);
866  }
867
868  //crypt and compare
869  if(auth_cryptPassword($clear,$method,$salt) === $crypt){
870    return true;
871  }
872  return false;
873}
874
875//Setup VIM: ex: et ts=2 enc=utf-8 :
876