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                            INNER JOIN  email_virtual_domains AS d ON (e.domain = d.id)
  87                                 WHERE  e.email = {?} AND d.name = {?}',
  88                               $login, Platal::globals()->mail->domain);
  89         } else {
  90             $res = XDB::query('SELECT  uid, password
  91                                  FROM  accounts
  92                                 WHERE  ' . $login_type . ' = {?}',
  93                               $login);
  94         }
  95         if (list($uid, $password) = $res->fetchOneRow()) {
  96             $expected_response = sha1("$uname:$password:" . S::v('challenge'));
  97             /* Deprecates len(password) > 10 conversion. */
  98             if ($response != $expected_response) {
  99                 if (!S::logged()) {
 100                     Platal::page()->trigError('Mot de passe ou nom d\'utilisateur invalide');
 101                 } else {
 102                     Platal::page()->trigError('Mot de passe invalide');
 103                 }
 104                 S::logger($uid)->log('auth_fail', 'bad password');
 105                 return null;
 106             }
 107             return $uid;
 108         }
 109         Platal::page()->trigError('Mot de passe ou nom d\'utilisateur invalide');
 110         return null;
 111     }
 112
 113
 114     /** Check auth.
 115      */
 116     protected function doAuth($level)
 117     {
 118         global $globals;
 119
 120         /* Cookie authentication
 121          */
 122         if ($level == AUTH_COOKIE && !S::has('auth_by_cookie')) {
 123             $this->tryCookie();
 124         }
 125         if ($level == AUTH_COOKIE && S::has('auth_by_cookie')) {
 126             if (!S::logged()) {
 127                 S::set('auth', AUTH_COOKIE);
 128             }
 129             return User::getSilentWithUID(S::i('auth_by_cookie'));
 130         }
 131
 132
 133         /* We want to do auth... we must have infos from a form.
 134          */
 135         if (!Post::has('username') || !Post::has('response') || !S::has('challenge')) {
 136             return null;
 137         }
 138
 139         /** We come from an authentication form.
 140          */
 141         if (S::suid()) {
 142             $login = $uname = S::suid('uid');
 143             $loginType = 'uid';
 144         } else {
 145             $uname = Post::v('username');
 146             if (Post::s('domain') == "alias") {
 147                 $login = XDB::fetchOneCell('SELECT  uid
 148                                               FROM  email_source_account
 149                                              WHERE  email = {?} AND type = \'alias_aux\'',
 150                                            $uname);
 151                 $loginType = 'uid';
 152             } else if (Post::s('domain') == "ax") {
 153                 $login = $uname;
 154                 $loginType = 'hruid';
 155             } else {
 156                 $login = $uname;
 157                 $loginType = is_numeric($uname) ? 'uid' : 'alias';
 158             }
 159         }
 160
 161         $uid = $this->checkPassword($uname, $login, Post::v('response'), $loginType);
 162         if (!is_null($uid) && S::suid()) {
 163             if (S::suid('uid') == $uid) {
 164                 $uid = S::i('uid');
 165             } else {
 166                 $uid = null;
 167             }
 168         }
 169         if (!is_null($uid)) {
 170             S::set('auth', AUTH_MDP);
 171             if (!S::suid()) {
 172                 if (Post::has('domain')) {
 173                     $domain = Post::v('domain', 'login');
 174                     if ($domain == 'alias') {
 175                         Cookie::set('domain', 'alias', 300);
 176                     } else if ($domain == 'ax') {
 177                         Cookie::set('domain', 'ax', 300);
 178                     } else {
 179                         Cookie::kill('domain');
 180                     }
 181                 }
 182             }
 183             S::kill('challenge');
 184             S::logger($uid)->log('auth_ok');
 185         }
 186         return User::getSilentWithUID($uid);
 187     }
 188
 189     protected function startSessionAs($user, $level)
 190     {
 191         if ((!is_null(S::user()) && S::user()->id() != $user->id())
 192             || (S::has('uid') && S::i('uid') != $user->id())) {
 193             return false;
 194         } else if (S::has('uid')) {
 195             return true;
 196         }
 197         if ($level == AUTH_SUID) {
 198             S::set('auth', AUTH_MDP);
 199         }
 200
 201         // Loads uid and hruid into the session for developement conveniance.
 202         $_SESSION = array_merge($_SESSION, array('uid' => $user->id(), 'hruid' => $user->hruid, 'token' => $user->token, 'user' => $user));
 203
 204         // Starts the session's logger, and sets up the permanent cookie.
 205         if (S::suid()) {
 206             S::logger()->log("suid_start", S::v('hruid') . ' by ' . S::suid('hruid'));
 207         } else {
 208             S::logger()->saveLastSession();
 209             Cookie::set('uid', $user->id(), 300);
 210
 211             if (S::i('auth_by_cookie') == $user->id() || Post::v('remember', 'false') == 'true') {
 212                 $this->setAccessCookie(false, S::i('auth_by_cookie') != $user->id());
 213             } else {
 214                 $this->killAccessCookie();
 215             }
 216         }
 217
 218         // Finalizes the session setup.
 219         $this->makePerms($user->perms, $user->is_admin);
 220         $this->securityChecks();
 221         $this->setSkin();
 222         $this->updateNbNotifs();
 223         check_redirect();
 224
 225         // We should not have to use this private data anymore
 226         S::kill('auth_by_cookie');
 227         return true;
 228     }
 229
 230     private function securityChecks()
 231     {
 232         $mail_subject = array();
 233         if (check_account()) {
 234             $mail_subject[] = 'Connexion d\'un utilisateur surveillé';
 235         }
 236         if (check_ip('unsafe')) {
 237             $mail_subject[] = 'Une IP surveillee a tente de se connecter';
 238             if (check_ip('ban')) {
 239                 send_warning_mail(implode(' - ', $mail_subject));
 240                 $this->destroy();
 241                 Platal::page()->kill('Une erreur est survenue lors de la procédure d\'authentification. '
 242                                     . 'Merci de contacter au plus vite '
 243                                     . '<a href="mailto:support@polytechnique.org">support@polytechnique.org</a>');
 244                 return false;
 245             }
 246         }
 247         if (count($mail_subject)) {
 248             send_warning_mail(implode(' - ', $mail_subject));
 249         }
 250     }
 251
 252     /**
 253      * The authentication schema is based on three query parameters:
 254      *   ?user=<hruid>&timestamp=<timestamp>&sig=<sig>
 255      * where:
 256      *   - hruid is the hruid of the querying user
 257      *   - timestamp is the current UNIX timestamp, which has to be within a
 258      *     given distance of the server-side UNIX timestamp
 259      *   - sig is the HMAC of "<method>#<resource>#<payload>#<timestamp>" using
 260      *     a known secret of the user as the key.
 261      *
 262      * At the moment, the shared secret of the user is the sha1 hash of its
 263      * password. This is temporary, though, until better support for tokens is
 264      * implemented in plat/al.
 265      * TODO(vzanotti): Switch to dedicated secrets for authentication.
 266      */
 267     public function apiAuth($method, $resource, $payload)
 268     {
 269         // Verify that the timestamp is within acceptable bounds.
 270         $timestamp = Env::i('timestamp', 0);
 271         if (abs($timestamp - time()) > Platal::globals()->api->timestamp_tolerance) {
 272             return null;
 273         }
 274
 275         // Retrieve the user corresponding to the forlife. Note that at the
 276         // moment, other aliases are also accepted.
 277         $user = User::getSilent(Env::s('user', ''));
 278         if (is_null($user) || !$user->isActive()) {
 279             return null;
 280         }
 281
 282         // Determine the list of tokens associated with the user. At the moment,
 283         // this is just the sha1 of the password.
 284         $tokens = array($user->password());
 285
 286         // For each token, try to validate the signature.
 287         $message = implode('#', array($method, $resource, $payload, $timestamp));
 288         $signature = Env::s('sig');
 289         foreach ($tokens as $token) {
 290             $expected_signature = hash_hmac(
 291                 Platal::globals()->api->hmac_algo, $message, $token);
 292             if ($signature == $expected_signature) {
 293                 return $user;
 294             }
 295         }
 296
 297         return null;
 298     }
 299
 300     public function tokenAuth($login, $token)
 301     {
 302         $res = XDB::query('SELECT  a.uid, a.hruid
 303                              FROM  accounts AS a
 304                             WHERE  a.token = {?} AND a.hruid = {?} AND a.state = \'active\'',
 305                           $token, $login);
 306         if ($res->numRows() == 1) {
 307             return new User(null, $res->fetchOneAssoc());
 308         }
 309         return null;
 310     }
 311
 312     protected function makePerms($perm, $is_admin)
 313     {
 314         S::set('perms', User::makePerms($perm, $is_admin));
 315     }
 316
 317     public function setSkin()
 318     {
 319         if (S::logged() && (!S::has('skin') || S::suid())) {
 320             $res = XDB::query('SELECT  skin_tpl
 321                                  FROM  accounts AS a
 322                            INNER JOIN  skins    AS s on (a.skin = s.id)
 323                                 WHERE  a.uid = {?} AND skin_tpl != \'\'', S::i('uid'));
 324             S::set('skin', $res->fetchOneCell());
 325         }
 326     }
 327
 328     public function loggedLevel()
 329     {
 330         return AUTH_COOKIE;
 331     }
 332
 333     public function sureLevel()
 334     {
 335         return AUTH_MDP;
 336     }
 337
 338
 339     public function updateNbNotifs()
 340     {
 341         require_once 'notifs.inc.php';
 342         $user = S::user();
 343         $n = Watch::getCount($user);
 344         S::set('notifs', $n);
 345     }
 346
 347     public function setAccessCookie($replace = false, $log = true) {
 348         if (S::suid() || ($replace && !Cookie::blank('access'))) {
 349             return;
 350         }
 351         Cookie::set('access', sha1(S::user()->password()), 300, true);
 352         if ($log) {
 353             S::logger()->log('cookie_on');
 354         }
 355     }
 356
 357     public function killAccessCookie($log = true) {
 358         Cookie::kill('access');
 359         if ($log) {
 360             S::logger()->log('cookie_off');
 361         }
 362     }
 363
 364     public function killLoginFormCookies() {
 365         Cookie::kill('uid');
 366         Cookie::kill('domain');
 367     }
 368 }
 369
 370 // vim:set et sw=4 sts=4 sws=4 foldmethod=marker enc=utf-8:
 371 ?>