xref: /dokuwiki/inc/auth.php (revision d613051ae9b5db0528293dbe6d918df6dbd7dc4e) 
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,'/');
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'] = $USERINFO;
141      return true;
142    }else{
143      //invalid credentials - log off
144      if(!$silent) msg($lang['badlogin'],-1);
145      auth_logoff();
146      return false;
147    }
148  }else{
149    // read cookie information
150    $cookie = base64_decode($_COOKIE[DOKU_COOKIE]);
151    list($user,$sticky,$pass) = split('\|',$cookie,3);
152    // get session info
153    $session = $_SESSION[DOKU_COOKIE]['auth'];
154    if($user && $pass){
155      // we got a cookie - see if we can trust it
156      if(isset($session) &&
157        ($session['user'] == $user) &&
158        ($session['pass'] == $pass) &&  //still crypted
159        ($session['buid'] == auth_browseruid()) ){
160        // he has session, cookie and browser right - let him in
161        $_SERVER['REMOTE_USER'] = $user;
162        $USERINFO = $session['info']; //FIXME move all references to session
163        return true;
164      }
165      // no we don't trust it yet - recheck pass but silent
166      $pass = PMA_blowfish_decrypt($pass,auth_cookiesalt());
167      return auth_login($user,$pass,$sticky,true);
168    }
169  }
170  //just to be sure
171  auth_logoff();
172  return false;
173}
174
175/**
176 * Builds a pseudo UID from browser and IP data
177 *
178 * This is neither unique nor unfakable - still it adds some
179 * security. Using the first part of the IP makes sure
180 * proxy farms like AOLs are stil okay.
181 *
182 * @author  Andreas Gohr <andi@splitbrain.org>
183 *
184 * @return  string  a MD5 sum of various browser headers
185 */
186function auth_browseruid(){
187  $uid  = '';
188  $uid .= $_SERVER['HTTP_USER_AGENT'];
189  $uid .= $_SERVER['HTTP_ACCEPT_ENCODING'];
190  $uid .= $_SERVER['HTTP_ACCEPT_LANGUAGE'];
191  $uid .= $_SERVER['HTTP_ACCEPT_CHARSET'];
192  $uid .= substr($_SERVER['REMOTE_ADDR'],0,strpos($_SERVER['REMOTE_ADDR'],'.'));
193  return md5($uid);
194}
195
196/**
197 * Creates a random key to encrypt the password in cookies
198 *
199 * This function tries to read the password for encrypting
200 * cookies from $conf['metadir'].'/_htcookiesalt'
201 * if no such file is found a random key is created and
202 * and stored in this file.
203 *
204 * @author  Andreas Gohr <andi@splitbrain.org>
205 *
206 * @return  string
207 */
208function auth_cookiesalt(){
209  global $conf;
210  $file = $conf['metadir'].'/_htcookiesalt';
211  $salt = io_readFile($file);
212  if(empty($salt)){
213    $salt = uniqid(rand(),true);
214    io_saveFile($file,$salt);
215  }
216  return $salt;
217}
218
219/**
220 * This clears all authenticationdata and thus log the user
221 * off
222 *
223 * @author  Andreas Gohr <andi@splitbrain.org>
224 */
225function auth_logoff(){
226  global $conf;
227  global $USERINFO;
228  global $INFO, $ID;
229  global $auth;
230
231  if(isset($_SESSION[DOKU_COOKIE]['auth']['user']))
232    unset($_SESSION[DOKU_COOKIE]['auth']['user']);
233  if(isset($_SESSION[DOKU_COOKIE]['auth']['pass']))
234    unset($_SESSION[DOKU_COOKIE]['auth']['pass']);
235  if(isset($_SESSION[DOKU_COOKIE]['auth']['info']))
236    unset($_SESSION[DOKU_COOKIE]['auth']['info']);
237  if(isset($_SERVER['REMOTE_USER']))
238    unset($_SERVER['REMOTE_USER']);
239  $USERINFO=null; //FIXME
240  setcookie(DOKU_COOKIE,'',time()-600000,'/');
241
242  if($auth && $auth->canDo('logoff')){
243    $auth->logOff();
244  }
245}
246
247/**
248 * Check if a user is a manager
249 *
250 * Should usually be called without any parameters to check the current
251 * user.
252 *
253 * The info is available through $INFO['ismanager'], too
254 *
255 * @author Andreas Gohr <andi@splitbrain.org>
256 * @see    auth_isadmin
257 * @param  string user      - Username
258 * @param  array  groups    - List of groups the user is in
259 * @param  bool   adminonly - when true checks if user is admin
260 */
261function auth_ismanager($user=null,$groups=null,$adminonly=false){
262  global $conf;
263  global $USERINFO;
264
265  if(!$conf['useacl']) return false;
266  if(is_null($user))   $user   = $_SERVER['REMOTE_USER'];
267  if(is_null($groups)) $groups = $USERINFO['grps'];
268  $user   = auth_nameencode($user);
269
270  // check username against superuser and manager
271  if(auth_nameencode($conf['superuser']) == $user) return true;
272  if(!$adminonly){
273    if(auth_nameencode($conf['manager']) == $user) return true;
274  }
275
276  //prepend groups with @ and nameencode
277  $cnt = count($groups);
278  for($i=0; $i<$cnt; $i++){
279    $groups[$i] = '@'.auth_nameencode($groups[$i]);
280  }
281
282  // check groups against superuser and manager
283  if(in_array(auth_nameencode($conf['superuser'],true), $groups)) return true;
284  if(!$adminonly){
285    if(in_array(auth_nameencode($conf['manager'],true), $groups)) return true;
286  }
287  return false;
288}
289
290/**
291 * Check if a user is admin
292 *
293 * Alias to auth_ismanager with adminonly=true
294 *
295 * The info is available through $INFO['isadmin'], too
296 *
297 * @author Andreas Gohr <andi@splitbrain.org>
298 * @see auth_ismanager
299 */
300function auth_isadmin($user=null,$groups=null){
301  return auth_ismanager($user,$groups,true);
302}
303
304/**
305 * Convinience function for auth_aclcheck()
306 *
307 * This checks the permissions for the current user
308 *
309 * @author  Andreas Gohr <andi@splitbrain.org>
310 *
311 * @param  string  $id  page ID
312 * @return int          permission level
313 */
314function auth_quickaclcheck($id){
315  global $conf;
316  global $USERINFO;
317  # if no ACL is used always return upload rights
318  if(!$conf['useacl']) return AUTH_UPLOAD;
319  return auth_aclcheck($id,$_SERVER['REMOTE_USER'],$USERINFO['grps']);
320}
321
322/**
323 * Returns the maximum rights a user has for
324 * the given ID or its namespace
325 *
326 * @author  Andreas Gohr <andi@splitbrain.org>
327 *
328 * @param  string  $id     page ID
329 * @param  string  $user   Username
330 * @param  array   $groups Array of groups the user is in
331 * @return int             permission level
332 */
333function auth_aclcheck($id,$user,$groups){
334  global $conf;
335  global $AUTH_ACL;
336
337  # if no ACL is used always return upload rights
338  if(!$conf['useacl']) return AUTH_UPLOAD;
339
340  $user = auth_nameencode($user);
341
342  //if user is superuser return 255 (acl_admin)
343  if(auth_nameencode($conf['superuser']) == $user) { return AUTH_ADMIN; }
344
345  //make sure groups is an array
346  if(!is_array($groups)) $groups = array();
347
348  //prepend groups with @ and nameencode
349  $cnt = count($groups);
350  for($i=0; $i<$cnt; $i++){
351    $groups[$i] = '@'.auth_nameencode($groups[$i]);
352  }
353  //if user is in superuser group return 255 (acl_admin)
354  if(in_array(auth_nameencode($conf['superuser'],true), $groups)) { return AUTH_ADMIN; }
355
356  $ns    = getNS($id);
357  $perm  = -1;
358
359  if($user){
360    //add ALL group
361    $groups[] = '@ALL';
362    //add User
363    $groups[] = $user;
364    //build regexp
365    $regexp   = join('|',$groups);
366  }else{
367    $regexp = '@ALL';
368  }
369
370  //check exact match first
371  $matches = preg_grep('/^'.preg_quote($id,'/').'\s+('.$regexp.')\s+/',$AUTH_ACL);
372  if(count($matches)){
373    foreach($matches as $match){
374      $match = preg_replace('/#.*$/','',$match); //ignore comments
375      $acl   = preg_split('/\s+/',$match);
376      if($acl[2] > AUTH_DELETE) $acl[2] = AUTH_DELETE; //no admins in the ACL!
377      if($acl[2] > $perm){
378        $perm = $acl[2];
379      }
380    }
381    if($perm > -1){
382      //we had a match - return it
383      return $perm;
384    }
385  }
386
387  //still here? do the namespace checks
388  if($ns){
389    $path = $ns.':\*';
390  }else{
391    $path = '\*'; //root document
392  }
393
394  do{
395    $matches = preg_grep('/^'.$path.'\s+('.$regexp.')\s+/',$AUTH_ACL);
396    if(count($matches)){
397      foreach($matches as $match){
398        $match = preg_replace('/#.*$/','',$match); //ignore comments
399        $acl   = preg_split('/\s+/',$match);
400        if($acl[2] > AUTH_DELETE) $acl[2] = AUTH_DELETE; //no admins in the ACL!
401        if($acl[2] > $perm){
402          $perm = $acl[2];
403        }
404      }
405      //we had a match - return it
406      return $perm;
407    }
408
409    //get next higher namespace
410    $ns   = getNS($ns);
411
412    if($path != '\*'){
413      $path = $ns.':\*';
414      if($path == ':\*') $path = '\*';
415    }else{
416      //we did this already
417      //looks like there is something wrong with the ACL
418      //break here
419      msg('No ACL setup yet! Denying access to everyone.');
420      return AUTH_NONE;
421    }
422  }while(1); //this should never loop endless
423
424  //still here? return no permissions
425  return AUTH_NONE;
426}
427
428/**
429 * Encode ASCII special chars
430 *
431 * Some auth backends allow special chars in their user and groupnames
432 * The special chars are encoded with this function. Only ASCII chars
433 * are encoded UTF-8 multibyte are left as is (different from usual
434 * urlencoding!).
435 *
436 * Decoding can be done with rawurldecode
437 *
438 * @author Andreas Gohr <gohr@cosmocode.de>
439 * @see rawurldecode()
440 */
441function auth_nameencode($name,$skip_group=false){
442  global $cache_authname;
443  $cache =& $cache_authname;
444  $name  = (string) $name;
445
446  if (!isset($cache[$name][$skip_group])) {
447    if($skip_group && $name{0} =='@'){
448      $cache[$name][$skip_group] = '@'.preg_replace('/([\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\x7f])/e',
449                                                    "'%'.dechex(ord('\\1'))",substr($name,1));
450    }else{
451      $cache[$name][$skip_group] = preg_replace('/([\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\x7f])/e',
452                                                "'%'.dechex(ord('\\1'))",$name);
453    }
454  }
455
456  return $cache[$name][$skip_group];
457}
458
459/**
460 * Create a pronouncable password
461 *
462 * @author  Andreas Gohr <andi@splitbrain.org>
463 * @link    http://www.phpbuilder.com/annotate/message.php3?id=1014451
464 *
465 * @return string  pronouncable password
466 */
467function auth_pwgen(){
468  $pw = '';
469  $c  = 'bcdfghjklmnprstvwz'; //consonants except hard to speak ones
470  $v  = 'aeiou';              //vowels
471  $a  = $c.$v;                //both
472
473  //use two syllables...
474  for($i=0;$i < 2; $i++){
475    $pw .= $c[rand(0, strlen($c)-1)];
476    $pw .= $v[rand(0, strlen($v)-1)];
477    $pw .= $a[rand(0, strlen($a)-1)];
478  }
479  //... and add a nice number
480  $pw .= rand(10,99);
481
482  return $pw;
483}
484
485/**
486 * Sends a password to the given user
487 *
488 * @author  Andreas Gohr <andi@splitbrain.org>
489 *
490 * @return bool  true on success
491 */
492function auth_sendPassword($user,$password){
493  global $conf;
494  global $lang;
495  global $auth;
496
497  $hdrs  = '';
498  $userinfo = $auth->getUserData($user);
499
500  if(!$userinfo['mail']) return false;
501
502  $text = rawLocale('password');
503  $text = str_replace('@DOKUWIKIURL@',DOKU_URL,$text);
504  $text = str_replace('@FULLNAME@',$userinfo['name'],$text);
505  $text = str_replace('@LOGIN@',$user,$text);
506  $text = str_replace('@PASSWORD@',$password,$text);
507  $text = str_replace('@TITLE@',$conf['title'],$text);
508
509  return mail_send($userinfo['name'].' <'.$userinfo['mail'].'>',
510                   $lang['regpwmail'],
511                   $text,
512                   $conf['mailfrom']);
513}
514
515/**
516 * Register a new user
517 *
518 * This registers a new user - Data is read directly from $_POST
519 *
520 * @author  Andreas Gohr <andi@splitbrain.org>
521 *
522 * @return bool  true on success, false on any error
523 */
524function register(){
525  global $lang;
526  global $conf;
527  global $auth;
528
529  if(!$_POST['save']) return false;
530  if(!$auth->canDo('addUser')) return false;
531
532  //clean username
533  $_POST['login'] = preg_replace('/.*:/','',$_POST['login']);
534  $_POST['login'] = cleanID($_POST['login']);
535  //clean fullname and email
536  $_POST['fullname'] = trim(preg_replace('/[\x00-\x1f:<>&%,;]+/','',$_POST['fullname']));
537  $_POST['email']    = trim(preg_replace('/[\x00-\x1f:<>&%,;]+/','',$_POST['email']));
538
539  if( empty($_POST['login']) ||
540      empty($_POST['fullname']) ||
541      empty($_POST['email']) ){
542    msg($lang['regmissing'],-1);
543    return false;
544  }
545
546  if ($conf['autopasswd']) {
547    $pass = auth_pwgen();                // automatically generate password
548  } elseif (empty($_POST['pass']) ||
549            empty($_POST['passchk'])) {
550    msg($lang['regmissing'], -1);        // complain about missing passwords
551    return false;
552  } elseif ($_POST['pass'] != $_POST['passchk']) {
553    msg($lang['regbadpass'], -1);      // complain about misspelled passwords
554    return false;
555  } else {
556    $pass = $_POST['pass'];              // accept checked and valid password
557  }
558
559  //check mail
560  if(!mail_isvalid($_POST['email'])){
561    msg($lang['regbadmail'],-1);
562    return false;
563  }
564
565  //okay try to create the user
566  if(!$auth->createUser($_POST['login'],$pass,$_POST['fullname'],$_POST['email'])){
567    msg($lang['reguexists'],-1);
568    return false;
569  }
570
571  // create substitutions for use in notification email
572  $substitutions = array(
573    'NEWUSER' => $_POST['login'],
574    'NEWNAME' => $_POST['fullname'],
575    'NEWEMAIL' => $_POST['email'],
576  );
577
578  if (!$conf['autopasswd']) {
579    msg($lang['regsuccess2'],1);
580    notify('', 'register', '', $_POST['login'], false, $substitutions);
581    return true;
582  }
583
584  // autogenerated password? then send him the password
585  if (auth_sendPassword($_POST['login'],$pass)){
586    msg($lang['regsuccess'],1);
587    notify('', 'register', '', $_POST['login'], false, $substitutions);
588    return true;
589  }else{
590    msg($lang['regmailfail'],-1);
591    return false;
592  }
593}
594
595/**
596 * Update user profile
597 *
598 * @author    Christopher Smith <chris@jalakai.co.uk>
599 */
600function updateprofile() {
601  global $conf;
602  global $INFO;
603  global $lang;
604  global $auth;
605
606  if(empty($_POST['save'])) return false;
607
608  // should not be able to get here without Profile being possible...
609  if(!$auth->canDo('Profile')) {
610    msg($lang['profna'],-1);
611    return false;
612  }
613
614  if ($_POST['newpass'] != $_POST['passchk']) {
615    msg($lang['regbadpass'], -1);      // complain about misspelled passwords
616    return false;
617  }
618
619  //clean fullname and email
620  $_POST['fullname'] = trim(preg_replace('/[\x00-\x1f:<>&%,;]+/','',$_POST['fullname']));
621  $_POST['email']    = trim(preg_replace('/[\x00-\x1f:<>&%,;]+/','',$_POST['email']));
622
623  if (empty($_POST['fullname']) || empty($_POST['email'])) {
624    msg($lang['profnoempty'],-1);
625    return false;
626  }
627
628  if (!mail_isvalid($_POST['email'])){
629    msg($lang['regbadmail'],-1);
630    return false;
631  }
632
633  if ($_POST['fullname'] != $INFO['userinfo']['name']) $changes['name'] = $_POST['fullname'];
634  if ($_POST['email']    != $INFO['userinfo']['mail']) $changes['mail'] = $_POST['email'];
635  if (!empty($_POST['newpass']))  $changes['pass'] = $_POST['newpass'];
636
637  if (!count($changes)) {
638    msg($lang['profnochange'], -1);
639    return false;
640  }
641
642  if ($conf['profileconfirm']) {
643      if (!auth_verifyPassword($_POST['oldpass'],$INFO['userinfo']['pass'])) {
644      msg($lang['badlogin'],-1);
645      return false;
646    }
647  }
648
649  return $auth->modifyUser($_SERVER['REMOTE_USER'], $changes);
650}
651
652/**
653 * Send a  new password
654 *
655 * This function handles both phases of the password reset:
656 *
657 *   - handling the first request of password reset
658 *   - validating the password reset auth token
659 *
660 * @author Benoit Chesneau <benoit@bchesneau.info>
661 * @author Chris Smith <chris@jalakai.co.uk>
662 * @author Andreas Gohr <andi@splitbrain.org>
663 *
664 * @return bool true on success, false on any error
665*/
666function act_resendpwd(){
667    global $lang;
668    global $conf;
669    global $auth;
670
671    if(!actionOK('resendpwd')) return false;
672
673    // should not be able to get here without modPass being possible...
674    if(!$auth->canDo('modPass')) {
675        msg($lang['resendna'],-1);
676        return false;
677    }
678
679    $token = preg_replace('/[^a-f0-9]+/','',$_REQUEST['pwauth']);
680
681    if($token){
682        // we're in token phase
683
684        $tfile = $conf['cachedir'].'/'.$token{0}.'/'.$token.'.pwauth';
685        if(!@file_exists($tfile)){
686            msg($lang['resendpwdbadauth'],-1);
687            return false;
688        }
689        $user = io_readfile($tfile);
690        @unlink($tfile);
691        $userinfo = $auth->getUserData($user);
692        if(!$userinfo['mail']) {
693            msg($lang['resendpwdnouser'], -1);
694            return false;
695        }
696
697        $pass = auth_pwgen();
698        if (!$auth->modifyUser($user,array('pass' => $pass))) {
699            msg('error modifying user data',-1);
700            return false;
701        }
702
703        if (auth_sendPassword($user,$pass)) {
704            msg($lang['resendpwdsuccess'],1);
705        } else {
706            msg($lang['regmailfail'],-1);
707        }
708        return true;
709
710    } else {
711        // we're in request phase
712
713        if(!$_POST['save']) return false;
714
715        if (empty($_POST['login'])) {
716            msg($lang['resendpwdmissing'], -1);
717            return false;
718        } else {
719            $_POST['login'] = preg_replace('/.*:/','',$_POST['login']);
720            $user = cleanID($_POST['login']);
721        }
722
723        $userinfo = $auth->getUserData($user);
724        if(!$userinfo['mail']) {
725            msg($lang['resendpwdnouser'], -1);
726            return false;
727        }
728
729        // generate auth token
730        $token = md5(auth_cookiesalt().$user); //secret but user based
731        $tfile = $conf['cachedir'].'/'.$token{0}.'/'.$token.'.pwauth';
732        $url = wl('',array('do'=>'resendpwd','pwauth'=>$token),true,'&');
733
734        io_saveFile($tfile,$user);
735
736        $text = rawLocale('pwconfirm');
737        $text = str_replace('@DOKUWIKIURL@',DOKU_URL,$text);
738        $text = str_replace('@FULLNAME@',$userinfo['name'],$text);
739        $text = str_replace('@LOGIN@',$user,$text);
740        $text = str_replace('@TITLE@',$conf['title'],$text);
741        $text = str_replace('@CONFIRM@',$url,$text);
742
743        if(mail_send($userinfo['name'].' <'.$userinfo['mail'].'>',
744                     $lang['regpwmail'],
745                     $text,
746                     $conf['mailfrom'])){
747            msg($lang['resendpwdconfirm'],1);
748        }else{
749            msg($lang['regmailfail'],-1);
750        }
751        return true;
752    }
753
754    return false; // never reached
755}
756
757/**
758 * Uses a regular expresion to check if a given mail address is valid
759 *
760 * May not be completly RFC conform!
761 *
762 * @link    http://www.webmasterworld.com/forum88/135.htm
763 *
764 * @param   string $email the address to check
765 * @return  bool          true if address is valid
766 */
767function isvalidemail($email){
768  return eregi("^[0-9a-z]([-_.]?[0-9a-z])*@[0-9a-z]([-.]?[0-9a-z])*\\.[a-z]{2,4}$", $email);
769}
770
771/**
772 * Encrypts a password using the given method and salt
773 *
774 * If the selected method needs a salt and none was given, a random one
775 * is chosen.
776 *
777 * The following methods are understood:
778 *
779 *   smd5  - Salted MD5 hashing
780 *   md5   - Simple MD5 hashing
781 *   sha1  - SHA1 hashing
782 *   ssha  - Salted SHA1 hashing
783 *   crypt - Unix crypt
784 *   mysql - MySQL password (old method)
785 *   my411 - MySQL 4.1.1 password
786 *
787 * @author  Andreas Gohr <andi@splitbrain.org>
788 * @return  string  The crypted password
789 */
790function auth_cryptPassword($clear,$method='',$salt=''){
791  global $conf;
792  if(empty($method)) $method = $conf['passcrypt'];
793
794  //prepare a salt
795  if(empty($salt)) $salt = md5(uniqid(rand(), true));
796
797  switch(strtolower($method)){
798    case 'smd5':
799        return crypt($clear,'$1$'.substr($salt,0,8).'$');
800    case 'md5':
801      return md5($clear);
802    case 'sha1':
803      return sha1($clear);
804    case 'ssha':
805      $salt=substr($salt,0,4);
806      return '{SSHA}'.base64_encode(pack("H*", sha1($clear.$salt)).$salt);
807    case 'crypt':
808      return crypt($clear,substr($salt,0,2));
809    case 'mysql':
810      //from http://www.php.net/mysql comment by <soren at byu dot edu>
811      $nr=0x50305735;
812      $nr2=0x12345671;
813      $add=7;
814      $charArr = preg_split("//", $clear);
815      foreach ($charArr as $char) {
816        if (($char == '') || ($char == ' ') || ($char == '\t')) continue;
817        $charVal = ord($char);
818        $nr ^= ((($nr & 63) + $add) * $charVal) + ($nr << 8);
819        $nr2 += ($nr2 << 8) ^ $nr;
820        $add += $charVal;
821      }
822      return sprintf("%08x%08x", ($nr & 0x7fffffff), ($nr2 & 0x7fffffff));
823    case 'my411':
824      return '*'.sha1(pack("H*", sha1($clear)));
825    default:
826      msg("Unsupported crypt method $method",-1);
827  }
828}
829
830/**
831 * Verifies a cleartext password against a crypted hash
832 *
833 * The method and salt used for the crypted hash is determined automatically
834 * then the clear text password is crypted using the same method. If both hashs
835 * match true is is returned else false
836 *
837 * @author  Andreas Gohr <andi@splitbrain.org>
838 * @return  bool
839 */
840function auth_verifyPassword($clear,$crypt){
841  $method='';
842  $salt='';
843
844  //determine the used method and salt
845  $len = strlen($crypt);
846  if(substr($crypt,0,3) == '$1$'){
847    $method = 'smd5';
848    $salt   = substr($crypt,3,8);
849  }elseif(substr($crypt,0,6) == '{SSHA}'){
850    $method = 'ssha';
851    $salt   = substr(base64_decode(substr($crypt, 6)),20);
852  }elseif($len == 32){
853    $method = 'md5';
854  }elseif($len == 40){
855    $method = 'sha1';
856  }elseif($len == 16){
857    $method = 'mysql';
858  }elseif($len == 41 && $crypt[0] == '*'){
859    $method = 'my411';
860  }else{
861    $method = 'crypt';
862    $salt   = substr($crypt,0,2);
863  }
864
865  //crypt and compare
866  if(auth_cryptPassword($clear,$method,$salt) === $crypt){
867    return true;
868  }
869  return false;
870}
871
872//Setup VIM: ex: et ts=2 enc=utf-8 :
873