xref: /dokuwiki/inc/auth.php (revision 85d03f688ed419d3e426dbb8187bf954d9a7a358) 
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',fullpath(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          // degrade to unauthenticated user
43          unset($auth);
44          auth_logoff();
45          msg($lang['authtempfail'], -1);
46        }
47      } else {
48        nice_die($lang['authmodfailed']);
49      }
50    } else {
51      nice_die($lang['authmodfailed']);
52    }
53  }
54
55  // do the login either by cookie or provided credentials
56  if($conf['useacl']){
57    if($auth){
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
76    //load ACL into a global array
77    global $AUTH_ACL;
78    if(is_readable(DOKU_CONF.'acl.auth.php')){
79      $AUTH_ACL = file(DOKU_CONF.'acl.auth.php');
80      if(isset($_SERVER['REMOTE_USER'])){
81        $AUTH_ACL = str_replace('@USER@',$_SERVER['REMOTE_USER'],$AUTH_ACL);
82      }
83    }else{
84      $AUTH_ACL = array();
85    }
86  }
87
88/**
89 * This tries to login the user based on the sent auth credentials
90 *
91 * The authentication works like this: if a username was given
92 * a new login is assumed and user/password are checked. If they
93 * are correct the password is encrypted with blowfish and stored
94 * together with the username in a cookie - the same info is stored
95 * in the session, too. Additonally a browserID is stored in the
96 * session.
97 *
98 * If no username was given the cookie is checked: if the username,
99 * crypted password and browserID match between session and cookie
100 * no further testing is done and the user is accepted
101 *
102 * If a cookie was found but no session info was availabe the
103 * blowfish encrypted password from the cookie is decrypted and
104 * together with username rechecked by calling this function again.
105 *
106 * On a successful login $_SERVER[REMOTE_USER] and $USERINFO
107 * are set.
108 *
109 * @author  Andreas Gohr <andi@splitbrain.org>
110 *
111 * @param   string  $user    Username
112 * @param   string  $pass    Cleartext Password
113 * @param   bool    $sticky  Cookie should not expire
114 * @param   bool    $silent  Don't show error on bad auth
115 * @return  bool             true on successful auth
116*/
117function auth_login($user,$pass,$sticky=false,$silent=false){
118  global $USERINFO;
119  global $conf;
120  global $lang;
121  global $auth;
122  $sticky ? $sticky = true : $sticky = false; //sanity check
123
124  if(!empty($user)){
125    //usual login
126    if ($auth->checkPass($user,$pass)){
127      // make logininfo globally available
128      $_SERVER['REMOTE_USER'] = $user;
129      $USERINFO = $auth->getUserData($user);
130
131      // set cookie
132      $pass   = PMA_blowfish_encrypt($pass,auth_cookiesalt());
133      $cookie = base64_encode("$user|$sticky|$pass");
134      if($sticky) $time = time()+60*60*24*365; //one year
135      setcookie(DOKU_COOKIE,$cookie,$time,DOKU_REL);
136
137      // set session
138      $_SESSION[DOKU_COOKIE]['auth']['user'] = $user;
139      $_SESSION[DOKU_COOKIE]['auth']['pass'] = $pass;
140      $_SESSION[DOKU_COOKIE]['auth']['buid'] = auth_browseruid();
141      $_SESSION[DOKU_COOKIE]['auth']['info'] = $USERINFO;
142      $_SESSION[DOKU_COOKIE]['auth']['time'] = time();
143
144      return true;
145    }else{
146      //invalid credentials - log off
147      if(!$silent) msg($lang['badlogin'],-1);
148      auth_logoff();
149      return false;
150    }
151  }else{
152    // read cookie information
153    $cookie = base64_decode($_COOKIE[DOKU_COOKIE]);
154    list($user,$sticky,$pass) = split('\|',$cookie,3);
155    // get session info
156    $session = $_SESSION[DOKU_COOKIE]['auth'];
157    if($user && $pass){
158      // we got a cookie - see if we can trust it
159      if(isset($session) &&
160        $auth->useSessionCache($user) &&
161        ($session['time'] >= time()-$conf['auth_security_timeout']) &&
162        ($session['user'] == $user) &&
163        ($session['pass'] == $pass) &&  //still crypted
164        ($session['buid'] == auth_browseruid()) ){
165        // he has session, cookie and browser right - let him in
166        $_SERVER['REMOTE_USER'] = $user;
167        $USERINFO = $session['info']; //FIXME move all references to session
168        return true;
169      }
170      // no we don't trust it yet - recheck pass but silent
171      $pass = PMA_blowfish_decrypt($pass,auth_cookiesalt());
172      return auth_login($user,$pass,$sticky,true);
173    }
174  }
175  //just to be sure
176  auth_logoff();
177  return false;
178}
179
180/**
181 * Builds a pseudo UID from browser and IP data
182 *
183 * This is neither unique nor unfakable - still it adds some
184 * security. Using the first part of the IP makes sure
185 * proxy farms like AOLs are stil okay.
186 *
187 * @author  Andreas Gohr <andi@splitbrain.org>
188 *
189 * @return  string  a MD5 sum of various browser headers
190 */
191function auth_browseruid(){
192  $uid  = '';
193  $uid .= $_SERVER['HTTP_USER_AGENT'];
194  $uid .= $_SERVER['HTTP_ACCEPT_ENCODING'];
195  $uid .= $_SERVER['HTTP_ACCEPT_LANGUAGE'];
196  $uid .= $_SERVER['HTTP_ACCEPT_CHARSET'];
197  $uid .= substr($_SERVER['REMOTE_ADDR'],0,strpos($_SERVER['REMOTE_ADDR'],'.'));
198  return md5($uid);
199}
200
201/**
202 * Creates a random key to encrypt the password in cookies
203 *
204 * This function tries to read the password for encrypting
205 * cookies from $conf['metadir'].'/_htcookiesalt'
206 * if no such file is found a random key is created and
207 * and stored in this file.
208 *
209 * @author  Andreas Gohr <andi@splitbrain.org>
210 *
211 * @return  string
212 */
213function auth_cookiesalt(){
214  global $conf;
215  $file = $conf['metadir'].'/_htcookiesalt';
216  $salt = io_readFile($file);
217  if(empty($salt)){
218    $salt = uniqid(rand(),true);
219    io_saveFile($file,$salt);
220  }
221  return $salt;
222}
223
224/**
225 * This clears all authenticationdata and thus log the user
226 * off
227 *
228 * @author  Andreas Gohr <andi@splitbrain.org>
229 */
230function auth_logoff(){
231  global $conf;
232  global $USERINFO;
233  global $INFO, $ID;
234  global $auth;
235
236  if(isset($_SESSION[DOKU_COOKIE]['auth']['user']))
237    unset($_SESSION[DOKU_COOKIE]['auth']['user']);
238  if(isset($_SESSION[DOKU_COOKIE]['auth']['pass']))
239    unset($_SESSION[DOKU_COOKIE]['auth']['pass']);
240  if(isset($_SESSION[DOKU_COOKIE]['auth']['info']))
241    unset($_SESSION[DOKU_COOKIE]['auth']['info']);
242  if(isset($_SERVER['REMOTE_USER']))
243    unset($_SERVER['REMOTE_USER']);
244  $USERINFO=null; //FIXME
245  setcookie(DOKU_COOKIE,'',time()-600000,DOKU_REL);
246
247  if($auth && $auth->canDo('logoff')){
248    $auth->logOff();
249  }
250}
251
252/**
253 * Check if a user is a manager
254 *
255 * Should usually be called without any parameters to check the current
256 * user.
257 *
258 * The info is available through $INFO['ismanager'], too
259 *
260 * @author Andreas Gohr <andi@splitbrain.org>
261 * @see    auth_isadmin
262 * @param  string user      - Username
263 * @param  array  groups    - List of groups the user is in
264 * @param  bool   adminonly - when true checks if user is admin
265 */
266function auth_ismanager($user=null,$groups=null,$adminonly=false){
267  global $conf;
268  global $USERINFO;
269
270  if(!$conf['useacl']) return false;
271  if(is_null($user))   $user   = $_SERVER['REMOTE_USER'];
272  if(is_null($groups)) $groups = (array) $USERINFO['grps'];
273  $user   = auth_nameencode($user);
274
275  // check username against superuser and manager
276  if(auth_nameencode($conf['superuser']) == $user) return true;
277  if(!$adminonly){
278    if(auth_nameencode($conf['manager']) == $user) return true;
279  }
280
281  // check user's groups against superuser and manager
282  if (!empty($groups)) {
283
284    //prepend groups with @ and nameencode
285    $cnt = count($groups);
286    for($i=0; $i<$cnt; $i++){
287      $groups[$i] = '@'.auth_nameencode($groups[$i]);
288    }
289
290    // check groups against superuser and manager
291    if(in_array(auth_nameencode($conf['superuser'],true), $groups)) return true;
292    if(!$adminonly){
293      if(in_array(auth_nameencode($conf['manager'],true), $groups)) return true;
294    }
295  }
296
297  return false;
298}
299
300/**
301 * Check if a user is admin
302 *
303 * Alias to auth_ismanager with adminonly=true
304 *
305 * The info is available through $INFO['isadmin'], too
306 *
307 * @author Andreas Gohr <andi@splitbrain.org>
308 * @see auth_ismanager
309 */
310function auth_isadmin($user=null,$groups=null){
311  return auth_ismanager($user,$groups,true);
312}
313
314/**
315 * Convinience function for auth_aclcheck()
316 *
317 * This checks the permissions for the current user
318 *
319 * @author  Andreas Gohr <andi@splitbrain.org>
320 *
321 * @param  string  $id  page ID
322 * @return int          permission level
323 */
324function auth_quickaclcheck($id){
325  global $conf;
326  global $USERINFO;
327  # if no ACL is used always return upload rights
328  if(!$conf['useacl']) return AUTH_UPLOAD;
329  return auth_aclcheck($id,$_SERVER['REMOTE_USER'],$USERINFO['grps']);
330}
331
332/**
333 * Returns the maximum rights a user has for
334 * the given ID or its namespace
335 *
336 * @author  Andreas Gohr <andi@splitbrain.org>
337 *
338 * @param  string  $id     page ID
339 * @param  string  $user   Username
340 * @param  array   $groups Array of groups the user is in
341 * @return int             permission level
342 */
343function auth_aclcheck($id,$user,$groups){
344  global $conf;
345  global $AUTH_ACL;
346
347  // if no ACL is used always return upload rights
348  if(!$conf['useacl']) return AUTH_UPLOAD;
349
350  //make sure groups is an array
351  if(!is_array($groups)) $groups = array();
352
353  //if user is superuser or in superusergroup return 255 (acl_admin)
354  if(auth_isadmin($user,$groups)) { return AUTH_ADMIN; }
355
356  $user = auth_nameencode($user);
357
358  //prepend groups with @ and nameencode
359  $cnt = count($groups);
360  for($i=0; $i<$cnt; $i++){
361    $groups[$i] = '@'.auth_nameencode($groups[$i]);
362  }
363
364  $ns    = getNS($id);
365  $perm  = -1;
366
367  if($user){
368    //add ALL group
369    $groups[] = '@ALL';
370    //add User
371    $groups[] = $user;
372    //build regexp
373    $regexp   = join('|',$groups);
374  }else{
375    $regexp = '@ALL';
376  }
377
378  //check exact match first
379  $matches = preg_grep('/^'.preg_quote($id,'/').'\s+('.$regexp.')\s+/',$AUTH_ACL);
380  if(count($matches)){
381    foreach($matches as $match){
382      $match = preg_replace('/#.*$/','',$match); //ignore comments
383      $acl   = preg_split('/\s+/',$match);
384      if($acl[2] > AUTH_DELETE) $acl[2] = AUTH_DELETE; //no admins in the ACL!
385      if($acl[2] > $perm){
386        $perm = $acl[2];
387      }
388    }
389    if($perm > -1){
390      //we had a match - return it
391      return $perm;
392    }
393  }
394
395  //still here? do the namespace checks
396  if($ns){
397    $path = $ns.':\*';
398  }else{
399    $path = '\*'; //root document
400  }
401
402  do{
403    $matches = preg_grep('/^'.$path.'\s+('.$regexp.')\s+/',$AUTH_ACL);
404    if(count($matches)){
405      foreach($matches as $match){
406        $match = preg_replace('/#.*$/','',$match); //ignore comments
407        $acl   = preg_split('/\s+/',$match);
408        if($acl[2] > AUTH_DELETE) $acl[2] = AUTH_DELETE; //no admins in the ACL!
409        if($acl[2] > $perm){
410          $perm = $acl[2];
411        }
412      }
413      //we had a match - return it
414      return $perm;
415    }
416
417    //get next higher namespace
418    $ns   = getNS($ns);
419
420    if($path != '\*'){
421      $path = $ns.':\*';
422      if($path == ':\*') $path = '\*';
423    }else{
424      //we did this already
425      //looks like there is something wrong with the ACL
426      //break here
427      msg('No ACL setup yet! Denying access to everyone.');
428      return AUTH_NONE;
429    }
430  }while(1); //this should never loop endless
431
432  //still here? return no permissions
433  return AUTH_NONE;
434}
435
436/**
437 * Encode ASCII special chars
438 *
439 * Some auth backends allow special chars in their user and groupnames
440 * The special chars are encoded with this function. Only ASCII chars
441 * are encoded UTF-8 multibyte are left as is (different from usual
442 * urlencoding!).
443 *
444 * Decoding can be done with rawurldecode
445 *
446 * @author Andreas Gohr <gohr@cosmocode.de>
447 * @see rawurldecode()
448 */
449function auth_nameencode($name,$skip_group=false){
450  global $cache_authname;
451  $cache =& $cache_authname;
452  $name  = (string) $name;
453
454  if (!isset($cache[$name][$skip_group])) {
455    if($skip_group && $name{0} =='@'){
456      $cache[$name][$skip_group] = '@'.preg_replace('/([\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\x7f])/e',
457                                                    "'%'.dechex(ord(substr('\\1',-1)))",substr($name,1));
458    }else{
459      $cache[$name][$skip_group] = preg_replace('/([\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\x7f])/e',
460                                                "'%'.dechex(ord(substr('\\1',-1)))",$name);
461    }
462  }
463
464  return $cache[$name][$skip_group];
465}
466
467/**
468 * Create a pronouncable password
469 *
470 * @author  Andreas Gohr <andi@splitbrain.org>
471 * @link    http://www.phpbuilder.com/annotate/message.php3?id=1014451
472 *
473 * @return string  pronouncable password
474 */
475function auth_pwgen(){
476  $pw = '';
477  $c  = 'bcdfghjklmnprstvwz'; //consonants except hard to speak ones
478  $v  = 'aeiou';              //vowels
479  $a  = $c.$v;                //both
480
481  //use two syllables...
482  for($i=0;$i < 2; $i++){
483    $pw .= $c[rand(0, strlen($c)-1)];
484    $pw .= $v[rand(0, strlen($v)-1)];
485    $pw .= $a[rand(0, strlen($a)-1)];
486  }
487  //... and add a nice number
488  $pw .= rand(10,99);
489
490  return $pw;
491}
492
493/**
494 * Sends a password to the given user
495 *
496 * @author  Andreas Gohr <andi@splitbrain.org>
497 *
498 * @return bool  true on success
499 */
500function auth_sendPassword($user,$password){
501  global $conf;
502  global $lang;
503  global $auth;
504
505  $hdrs  = '';
506  $userinfo = $auth->getUserData($user);
507
508  if(!$userinfo['mail']) return false;
509
510  $text = rawLocale('password');
511  $text = str_replace('@DOKUWIKIURL@',DOKU_URL,$text);
512  $text = str_replace('@FULLNAME@',$userinfo['name'],$text);
513  $text = str_replace('@LOGIN@',$user,$text);
514  $text = str_replace('@PASSWORD@',$password,$text);
515  $text = str_replace('@TITLE@',$conf['title'],$text);
516
517  return mail_send($userinfo['name'].' <'.$userinfo['mail'].'>',
518                   $lang['regpwmail'],
519                   $text,
520                   $conf['mailfrom']);
521}
522
523/**
524 * Register a new user
525 *
526 * This registers a new user - Data is read directly from $_POST
527 *
528 * @author  Andreas Gohr <andi@splitbrain.org>
529 *
530 * @return bool  true on success, false on any error
531 */
532function register(){
533  global $lang;
534  global $conf;
535  global $auth;
536
537  if(!$_POST['save']) return false;
538  if(!$auth->canDo('addUser')) return false;
539
540  //clean username
541  $_POST['login'] = preg_replace('/.*:/','',$_POST['login']);
542  $_POST['login'] = cleanID($_POST['login']);
543  //clean fullname and email
544  $_POST['fullname'] = trim(preg_replace('/[\x00-\x1f:<>&%,;]+/','',$_POST['fullname']));
545  $_POST['email']    = trim(preg_replace('/[\x00-\x1f:<>&%,;]+/','',$_POST['email']));
546
547  if( empty($_POST['login']) ||
548      empty($_POST['fullname']) ||
549      empty($_POST['email']) ){
550    msg($lang['regmissing'],-1);
551    return false;
552  }
553
554  if ($conf['autopasswd']) {
555    $pass = auth_pwgen();                // automatically generate password
556  } elseif (empty($_POST['pass']) ||
557            empty($_POST['passchk'])) {
558    msg($lang['regmissing'], -1);        // complain about missing passwords
559    return false;
560  } elseif ($_POST['pass'] != $_POST['passchk']) {
561    msg($lang['regbadpass'], -1);      // complain about misspelled passwords
562    return false;
563  } else {
564    $pass = $_POST['pass'];              // accept checked and valid password
565  }
566
567  //check mail
568  if(!mail_isvalid($_POST['email'])){
569    msg($lang['regbadmail'],-1);
570    return false;
571  }
572
573  //okay try to create the user
574  if(!$auth->createUser($_POST['login'],$pass,$_POST['fullname'],$_POST['email'])){
575    msg($lang['reguexists'],-1);
576    return false;
577  }
578
579  // create substitutions for use in notification email
580  $substitutions = array(
581    'NEWUSER' => $_POST['login'],
582    'NEWNAME' => $_POST['fullname'],
583    'NEWEMAIL' => $_POST['email'],
584  );
585
586  if (!$conf['autopasswd']) {
587    msg($lang['regsuccess2'],1);
588    notify('', 'register', '', $_POST['login'], false, $substitutions);
589    return true;
590  }
591
592  // autogenerated password? then send him the password
593  if (auth_sendPassword($_POST['login'],$pass)){
594    msg($lang['regsuccess'],1);
595    notify('', 'register', '', $_POST['login'], false, $substitutions);
596    return true;
597  }else{
598    msg($lang['regmailfail'],-1);
599    return false;
600  }
601}
602
603/**
604 * Update user profile
605 *
606 * @author    Christopher Smith <chris@jalakai.co.uk>
607 */
608function updateprofile() {
609  global $conf;
610  global $INFO;
611  global $lang;
612  global $auth;
613
614  if(empty($_POST['save'])) return false;
615  if(!checkSecurityToken()) return false;
616
617  // should not be able to get here without Profile being possible...
618  if(!$auth->canDo('Profile')) {
619    msg($lang['profna'],-1);
620    return false;
621  }
622
623  if ($_POST['newpass'] != $_POST['passchk']) {
624    msg($lang['regbadpass'], -1);      // complain about misspelled passwords
625    return false;
626  }
627
628  //clean fullname and email
629  $_POST['fullname'] = trim(preg_replace('/[\x00-\x1f:<>&%,;]+/','',$_POST['fullname']));
630  $_POST['email']    = trim(preg_replace('/[\x00-\x1f:<>&%,;]+/','',$_POST['email']));
631
632  if (empty($_POST['fullname']) || empty($_POST['email'])) {
633    msg($lang['profnoempty'],-1);
634    return false;
635  }
636
637  if (!mail_isvalid($_POST['email'])){
638    msg($lang['regbadmail'],-1);
639    return false;
640  }
641
642  if ($_POST['fullname'] != $INFO['userinfo']['name'] && $auth->canDo('modName')) $changes['name'] = $_POST['fullname'];
643  if ($_POST['email'] != $INFO['userinfo']['mail'] && $auth->canDo('modMail')) $changes['mail'] = $_POST['email'];
644  if (!empty($_POST['newpass']) && $auth->canDo['modPass']) $changes['pass'] = $_POST['newpass'];
645
646
647  if (!count($changes)) {
648    msg($lang['profnochange'], -1);
649    return false;
650  }
651
652  if ($conf['profileconfirm']) {
653    if (!$auth->checkPass($_SERVER['REMOTE_USER'], $_POST['oldpass'])) {
654      msg($lang['badlogin'],-1);
655      return false;
656    }
657  }
658
659  return $auth->modifyUser($_SERVER['REMOTE_USER'], $changes);
660}
661
662/**
663 * Send a  new password
664 *
665 * This function handles both phases of the password reset:
666 *
667 *   - handling the first request of password reset
668 *   - validating the password reset auth token
669 *
670 * @author Benoit Chesneau <benoit@bchesneau.info>
671 * @author Chris Smith <chris@jalakai.co.uk>
672 * @author Andreas Gohr <andi@splitbrain.org>
673 *
674 * @return bool true on success, false on any error
675*/
676function act_resendpwd(){
677    global $lang;
678    global $conf;
679    global $auth;
680
681    if(!actionOK('resendpwd')) return false;
682
683    // should not be able to get here without modPass being possible...
684    if(!$auth->canDo('modPass')) {
685        msg($lang['resendna'],-1);
686        return false;
687    }
688
689    $token = preg_replace('/[^a-f0-9]+/','',$_REQUEST['pwauth']);
690
691    if($token){
692        // we're in token phase
693
694        $tfile = $conf['cachedir'].'/'.$token{0}.'/'.$token.'.pwauth';
695        if(!@file_exists($tfile)){
696            msg($lang['resendpwdbadauth'],-1);
697            return false;
698        }
699        $user = io_readfile($tfile);
700        @unlink($tfile);
701        $userinfo = $auth->getUserData($user);
702        if(!$userinfo['mail']) {
703            msg($lang['resendpwdnouser'], -1);
704            return false;
705        }
706
707        $pass = auth_pwgen();
708        if (!$auth->modifyUser($user,array('pass' => $pass))) {
709            msg('error modifying user data',-1);
710            return false;
711        }
712
713        if (auth_sendPassword($user,$pass)) {
714            msg($lang['resendpwdsuccess'],1);
715        } else {
716            msg($lang['regmailfail'],-1);
717        }
718        return true;
719
720    } else {
721        // we're in request phase
722
723        if(!$_POST['save']) return false;
724
725        if (empty($_POST['login'])) {
726            msg($lang['resendpwdmissing'], -1);
727            return false;
728        } else {
729            $_POST['login'] = preg_replace('/.*:/','',$_POST['login']);
730            $user = cleanID($_POST['login']);
731        }
732
733        $userinfo = $auth->getUserData($user);
734        if(!$userinfo['mail']) {
735            msg($lang['resendpwdnouser'], -1);
736            return false;
737        }
738
739        // generate auth token
740        $token = md5(auth_cookiesalt().$user); //secret but user based
741        $tfile = $conf['cachedir'].'/'.$token{0}.'/'.$token.'.pwauth';
742        $url = wl('',array('do'=>'resendpwd','pwauth'=>$token),true,'&');
743
744        io_saveFile($tfile,$user);
745
746        $text = rawLocale('pwconfirm');
747        $text = str_replace('@DOKUWIKIURL@',DOKU_URL,$text);
748        $text = str_replace('@FULLNAME@',$userinfo['name'],$text);
749        $text = str_replace('@LOGIN@',$user,$text);
750        $text = str_replace('@TITLE@',$conf['title'],$text);
751        $text = str_replace('@CONFIRM@',$url,$text);
752
753        if(mail_send($userinfo['name'].' <'.$userinfo['mail'].'>',
754                     $lang['regpwmail'],
755                     $text,
756                     $conf['mailfrom'])){
757            msg($lang['resendpwdconfirm'],1);
758        }else{
759            msg($lang['regmailfail'],-1);
760        }
761        return true;
762    }
763
764    return false; // never reached
765}
766
767/**
768 * Uses a regular expresion to check if a given mail address is valid
769 *
770 * May not be completly RFC conform!
771 *
772 * @link    http://www.webmasterworld.com/forum88/135.htm
773 *
774 * @param   string $email the address to check
775 * @return  bool          true if address is valid
776 */
777function isvalidemail($email){
778  return eregi("^[0-9a-z]([-_.]?[0-9a-z])*@[0-9a-z]([-.]?[0-9a-z])*\\.[a-z]{2,4}$", $email);
779}
780
781/**
782 * Encrypts a password using the given method and salt
783 *
784 * If the selected method needs a salt and none was given, a random one
785 * is chosen.
786 *
787 * The following methods are understood:
788 *
789 *   smd5  - Salted MD5 hashing
790 *   md5   - Simple MD5 hashing
791 *   sha1  - SHA1 hashing
792 *   ssha  - Salted SHA1 hashing
793 *   crypt - Unix crypt
794 *   mysql - MySQL password (old method)
795 *   my411 - MySQL 4.1.1 password
796 *
797 * @author  Andreas Gohr <andi@splitbrain.org>
798 * @return  string  The crypted password
799 */
800function auth_cryptPassword($clear,$method='',$salt=''){
801  global $conf;
802  if(empty($method)) $method = $conf['passcrypt'];
803
804  //prepare a salt
805  if(empty($salt)) $salt = md5(uniqid(rand(), true));
806
807  switch(strtolower($method)){
808    case 'smd5':
809        return crypt($clear,'$1$'.substr($salt,0,8).'$');
810    case 'md5':
811      return md5($clear);
812    case 'sha1':
813      return sha1($clear);
814    case 'ssha':
815      $salt=substr($salt,0,4);
816      return '{SSHA}'.base64_encode(pack("H*", sha1($clear.$salt)).$salt);
817    case 'crypt':
818      return crypt($clear,substr($salt,0,2));
819    case 'mysql':
820      //from http://www.php.net/mysql comment by <soren at byu dot edu>
821      $nr=0x50305735;
822      $nr2=0x12345671;
823      $add=7;
824      $charArr = preg_split("//", $clear);
825      foreach ($charArr as $char) {
826        if (($char == '') || ($char == ' ') || ($char == '\t')) continue;
827        $charVal = ord($char);
828        $nr ^= ((($nr & 63) + $add) * $charVal) + ($nr << 8);
829        $nr2 += ($nr2 << 8) ^ $nr;
830        $add += $charVal;
831      }
832      return sprintf("%08x%08x", ($nr & 0x7fffffff), ($nr2 & 0x7fffffff));
833    case 'my411':
834      return '*'.sha1(pack("H*", sha1($clear)));
835    default:
836      msg("Unsupported crypt method $method",-1);
837  }
838}
839
840/**
841 * Verifies a cleartext password against a crypted hash
842 *
843 * The method and salt used for the crypted hash is determined automatically
844 * then the clear text password is crypted using the same method. If both hashs
845 * match true is is returned else false
846 *
847 * @author  Andreas Gohr <andi@splitbrain.org>
848 * @return  bool
849 */
850function auth_verifyPassword($clear,$crypt){
851  $method='';
852  $salt='';
853
854  //determine the used method and salt
855  $len = strlen($crypt);
856  if(substr($crypt,0,3) == '$1$'){
857    $method = 'smd5';
858    $salt   = substr($crypt,3,8);
859  }elseif(substr($crypt,0,6) == '{SSHA}'){
860    $method = 'ssha';
861    $salt   = substr(base64_decode(substr($crypt, 6)),20);
862  }elseif($len == 32){
863    $method = 'md5';
864  }elseif($len == 40){
865    $method = 'sha1';
866  }elseif($len == 16){
867    $method = 'mysql';
868  }elseif($len == 41 && $crypt[0] == '*'){
869    $method = 'my411';
870  }else{
871    $method = 'crypt';
872    $salt   = substr($crypt,0,2);
873  }
874
875  //crypt and compare
876  if(auth_cryptPassword($clear,$method,$salt) === $crypt){
877    return true;
878  }
879  return false;
880}
881
882//Setup VIM: ex: et ts=2 enc=utf-8 :
883