classes/xorgsession.php

   1 <?php
   2 /***************************************************************************
   3  *  Copyright (C) 2003-2011 Polytechnique.org                              *
   4  *  http://opensource.polytechnique.org/                                   *
   5  *                                                                         *
   6  *  This program is free software; you can redistribute it and/or modify   *
   7  *  it under the terms of the GNU General Public License as published by   *
   8  *  the Free Software Foundation; either version 2 of the License, or      *
   9  *  (at your option) any later version.                                    *
  10  *                                                                         *
  11  *  This program is distributed in the hope that it will be useful,        *
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of         *
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
  14  *  GNU General Public License for more details.                           *
  15  *                                                                         *
  16  *  You should have received a copy of the GNU General Public License      *
  17  *  along with this program; if not, write to the Free Software            *
  18  *  Foundation, Inc.,                                                      *
  19  *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA                *
  20  ***************************************************************************/
  21
  22 class XorgSession extends PlSession
  23 {
  24     const INVALID_USER = -2;
  25     const NO_COOKIE = -1;
  26     const COOKIE_SUCCESS = 0;
  27     const INVALID_COOKIE = 1;
  28
  29     public function __construct()
  30     {
  31         parent::__construct();
  32     }
  33
  34     public function startAvailableAuth()
  35     {
  36         if (!S::logged()) {
  37             switch ($this->tryCookie()) {
  38               case self::COOKIE_SUCCESS:
  39                 if (!$this->start(AUTH_COOKIE)) {
  40                     return false;
  41                 }
  42                 break;
  43
  44               case self::INVALID_USER:
  45               case self::INVALID_COOKIE:
  46                 return false;
  47             }
  48         }
  49         if ((check_ip('dangerous') && S::has('uid')) || check_account()) {
  50             S::logger()->log("view_page", $_SERVER['REQUEST_URI']);
  51         }
  52         return true;
  53     }
  54
  55     /** Check the cookie and set the associated uid in the auth_by_cookie session variable.
  56      */
  57     private function tryCookie()
  58     {
  59         S::kill('auth_by_cookie');
  60         if (Cookie::v('access') == '' || !Cookie::has('uid')) {
  61             return self::NO_COOKIE;
  62         }
  63
  64         $res = XDB::query('SELECT  uid, password
  65                              FROM  accounts
  66                             WHERE  uid = {?} AND state = \'active\'',
  67                          Cookie::i('uid'));
  68         if ($res->numRows() != 0) {
  69             list($uid, $password) = $res->fetchOneRow();
  70             if (sha1($password) == Cookie::v('access')) {
  71                 S::set('auth_by_cookie', $uid);
  72                 return self::COOKIE_SUCCESS;
  73             } else {
  74                 return self::INVALID_COOKIE;
  75             }
  76         }
  77         return self::INVALID_USER;
  78     }
  79
  80     private function checkPassword($uname, $login, $response, $login_type)
  81     {
  82         if ($login_type == 'alias') {
  83             $res = XDB::query('SELECT  a.uid, a.password
  84                                  FROM  accounts             AS a
  85                            INNER JOIN  email_source_account AS e ON (e.uid = a.uid)
  86                                 WHERE  e.email = {?}',
  87                               $login);
  88         } else {
  89             $res = XDB::query('SELECT  uid, password
  90                                  FROM  accounts
  91                                 WHERE  ' . $login_type . ' = {?}',
  92                               $login);
  93         }
  94         if (list($uid, $password) = $res->fetchOneRow()) {
  95             $expected_response = sha1("$uname:$password:" . S::v('challenge'));
  96             /* Deprecates len(password) > 10 conversion. */
  97             if ($response != $expected_response) {
  98                 if (!S::logged()) {
  99                     Platal::page()->trigError('Mot de passe ou nom d\'utilisateur invalide');
 100                 } else {
 101                     Platal::page()->trigError('Mot de passe invalide');
 102                 }
 103                 S::logger($uid)->log('auth_fail', 'bad password');
 104                 return null;
 105             }
 106             return $uid;
 107         }
 108         Platal::page()->trigError('Mot de passe ou nom d\'utilisateur invalide');
 109         return null;
 110     }
 111
 112
 113     /** Check auth.
 114      */
 115     protected function doAuth($level)
 116     {
 117         global $globals;
 118
 119         /* Cookie authentication
 120          */
 121         if ($level == AUTH_COOKIE && !S::has('auth_by_cookie')) {
 122             $this->tryCookie();
 123         }
 124         if ($level == AUTH_COOKIE && S::has('auth_by_cookie')) {
 125             if (!S::logged()) {
 126                 S::set('auth', AUTH_COOKIE);
 127             }
 128             return User::getSilentWithUID(S::i('auth_by_cookie'));
 129         }
 130
 131
 132         /* We want to do auth... we must have infos from a form.
 133          */
 134         if (!Post::has('username') || !Post::has('response') || !S::has('challenge')) {
 135             return null;
 136         }
 137
 138         /** We come from an authentication form.
 139          */
 140         if (S::suid()) {
 141             $login = $uname = S::suid('uid');
 142             $loginType = 'uid';
 143         } else {
 144             $uname = Post::v('username');
 145             if (Post::s('domain') == "alias") {
 146                 $login = XDB::fetchOneCell('SELECT  uid
 147                                               FROM  email_source_account
 148                                              WHERE  email = {?} AND type = \'alias_aux\'',
 149                                            $uname);
 150                 $loginType = 'uid';
 151             } else if (Post::s('domain') == "ax") {
 152                 $login = $uname;
 153                 $loginType = 'hruid';
 154             } else {
 155                 $login = $uname;
 156                 $loginType = is_numeric($uname) ? 'uid' : 'alias';
 157             }
 158         }
 159
 160         $uid = $this->checkPassword($uname, $login, Post::v('response'), $loginType);
 161         if (!is_null($uid) && S::suid()) {
 162             if (S::suid('uid') == $uid) {
 163                 $uid = S::i('uid');
 164             } else {
 165                 $uid = null;
 166             }
 167         }
 168         if (!is_null($uid)) {
 169             S::set('auth', AUTH_MDP);
 170             if (!S::suid()) {
 171                 if (Post::has('domain')) {
 172                     $domain = Post::v('domain', 'login');
 173                     if ($domain == 'alias') {
 174                         Cookie::set('domain', 'alias', 300);
 175                     } else if ($domain == 'ax') {
 176                         Cookie::set('domain', 'ax', 300);
 177                     } else {
 178                         Cookie::kill('domain');
 179                     }
 180                 }
 181             }
 182             S::kill('challenge');
 183             S::logger($uid)->log('auth_ok');
 184         }
 185         return User::getSilentWithUID($uid);
 186     }
 187
 188     protected function startSessionAs($user, $level)
 189     {
 190         if ((!is_null(S::user()) && S::user()->id() != $user->id())
 191             || (S::has('uid') && S::i('uid') != $user->id())) {
 192             return false;
 193         } else if (S::has('uid')) {
 194             return true;
 195         }
 196         if ($level == AUTH_SUID) {
 197             S::set('auth', AUTH_MDP);
 198         }
 199
 200         // Loads uid and hruid into the session for developement conveniance.
 201         $_SESSION = array_merge($_SESSION, array('uid' => $user->id(), 'hruid' => $user->hruid, 'token' => $user->token, 'user' => $user));
 202
 203         // Starts the session's logger, and sets up the permanent cookie.
 204         if (S::suid()) {
 205             S::logger()->log("suid_start", S::v('hruid') . ' by ' . S::suid('hruid'));
 206         } else {
 207             S::logger()->saveLastSession();
 208             Cookie::set('uid', $user->id(), 300);
 209
 210             if (S::i('auth_by_cookie') == $user->id() || Post::v('remember', 'false') == 'true') {
 211                 $this->setAccessCookie(false, S::i('auth_by_cookie') != $user->id());
 212             } else {
 213                 $this->killAccessCookie();
 214             }
 215         }
 216
 217         // Finalizes the session setup.
 218         $this->makePerms($user->perms, $user->is_admin);
 219         $this->securityChecks();
 220         $this->setSkin();
 221         $this->updateNbNotifs();
 222         check_redirect();
 223
 224         // We should not have to use this private data anymore
 225         S::kill('auth_by_cookie');
 226         return true;
 227     }
 228
 229     private function securityChecks()
 230     {
 231         $mail_subject = array();
 232         if (check_account()) {
 233             $mail_subject[] = 'Connexion d\'un utilisateur surveillé';
 234         }
 235         if (check_ip('unsafe')) {
 236             $mail_subject[] = 'Une IP surveillee a tente de se connecter';
 237             if (check_ip('ban')) {
 238                 send_warning_mail(implode(' - ', $mail_subject));
 239                 $this->destroy();
 240                 Platal::page()->kill('Une erreur est survenue lors de la procédure d\'authentification. '
 241                                     . 'Merci de contacter au plus vite '
 242                                     . '<a href="mailto:support@polytechnique.org">support@polytechnique.org</a>');
 243                 return false;
 244             }
 245         }
 246         if (count($mail_subject)) {
 247             send_warning_mail(implode(' - ', $mail_subject));
 248         }
 249     }
 250
 251     /**
 252      * The authentication schema is based on three query parameters:
 253      *   ?user=<hruid>&timestamp=<timestamp>&sig=<sig>
 254      * where:
 255      *   - hruid is the hruid of the querying user
 256      *   - timestamp is the current UNIX timestamp, which has to be within a
 257      *     given distance of the server-side UNIX timestamp
 258      *   - sig is the HMAC of "<method>#<resource>#<payload>#<timestamp>" using
 259      *     a known secret of the user as the key.
 260      *
 261      * At the moment, the shared secret of the user is the sha1 hash of its
 262      * password. This is temporary, though, until better support for tokens is
 263      * implemented in plat/al.
 264      * TODO(vzanotti): Switch to dedicated secrets for authentication.
 265      */
 266     public function apiAuth($method, $resource, $payload)
 267     {
 268         // Verify that the timestamp is within acceptable bounds.
 269         $timestamp = Env::i('timestamp', 0);
 270         if (abs($timestamp - time()) > Platal::globals()->api->timestamp_tolerance) {
 271             return null;
 272         }
 273
 274         // Retrieve the user corresponding to the forlife. Note that at the
 275         // moment, other aliases are also accepted.
 276         $user = User::getSilent(Env::s('user', ''));
 277         if (is_null($user) || !$user->isActive()) {
 278             return null;
 279         }
 280
 281         // Determine the list of tokens associated with the user. At the moment,
 282         // this is just the sha1 of the password.
 283         $tokens = array($user->password());
 284
 285         // For each token, try to validate the signature.
 286         $message = implode('#', array($method, $resource, $payload, $timestamp));
 287         $signature = Env::s('sig');
 288         foreach ($tokens as $token) {
 289             $expected_signature = hash_hmac(
 290                 Platal::globals()->api->hmac_algo, $message, $token);
 291             if ($signature == $expected_signature) {
 292                 return $user;
 293             }
 294         }
 295
 296         return null;
 297     }
 298
 299     public function tokenAuth($login, $token)
 300     {
 301         $res = XDB::query('SELECT  a.uid, a.hruid
 302                              FROM  accounts AS a
 303                             WHERE  a.token = {?} AND a.hruid = {?} AND a.state = \'active\'',
 304                           $token, $login);
 305         if ($res->numRows() == 1) {
 306             return new User(null, $res->fetchOneAssoc());
 307         }
 308         return null;
 309     }
 310
 311     protected function makePerms($perm, $is_admin)
 312     {
 313         S::set('perms', User::makePerms($perm, $is_admin));
 314     }
 315
 316     public function setSkin()
 317     {
 318         if (S::logged() && (!S::has('skin') || S::suid())) {
 319             $res = XDB::query('SELECT  skin_tpl
 320                                  FROM  accounts AS a
 321                            INNER JOIN  skins    AS s on (a.skin = s.id)
 322                                 WHERE  a.uid = {?} AND skin_tpl != \'\'', S::i('uid'));
 323             S::set('skin', $res->fetchOneCell());
 324         }
 325     }
 326
 327     public function loggedLevel()
 328     {
 329         return AUTH_COOKIE;
 330     }
 331
 332     public function sureLevel()
 333     {
 334         return AUTH_MDP;
 335     }
 336
 337
 338     public function updateNbNotifs()
 339     {
 340         require_once 'notifs.inc.php';
 341         $user = S::user();
 342         $n = Watch::getCount($user);
 343         S::set('notifs', $n);
 344     }
 345
 346     public function setAccessCookie($replace = false, $log = true) {
 347         if (S::suid() || ($replace && !Cookie::blank('access'))) {
 348             return;
 349         }
 350         Cookie::set('access', sha1(S::user()->password()), 300, true);
 351         if ($log) {
 352             S::logger()->log('cookie_on');
 353         }
 354     }
 355
 356     public function killAccessCookie($log = true) {
 357         Cookie::kill('access');
 358         if ($log) {
 359             S::logger()->log('cookie_off');
 360         }
 361     }
 362
 363     public function killLoginFormCookies() {
 364         Cookie::kill('uid');
 365         Cookie::kill('domain');
 366     }
 367 }
 368
 369 // vim:set et sw=4 sts=4 sws=4 foldmethod=marker enc=utf-8:
 370 ?>