git.defcon.no Git - hermes/blob - api/lib/auth_base.php

   1 <?php
   2 require_once('config.php');
   3
   4 $config = get_config();
   5
   6 function authlevel_value( $level )
   7 {
   8         switch ( $level )
   9         {
  10                 case 'limited_read':
  11                         return 1;
  12                 case 'full_read':
  13                         return 2;
  14                 case 'read_write':
  15                         return 3;
  16                 default:
  17                         return 0;
  18         }
  19 }
  20 function authlevel_name( $level )
  21 {
  22         switch ( $level )
  23         {
  24                 case 1:
  25                         return 'limited_read';
  26                 case 2:
  27                         return 'full_read';
  28                 case 3:
  29                         return 'read_write';
  30                 default:
  31                         return 'no_access';
  32         }
  33 }
  34
  35 /*******************************
  36 * Load authentication plugin ..
  37 *******************************/
  38 if ( preg_match('/^\w+$/', $config['auth_backend']))
  39 {
  40         if ( !@include_once ( 'lib/auth_plugins/' . $config['auth_backend'] . ".php" ) )
  41         {  print json_encode( array( 'response' => 'error', 'cause' => 'auth-load' ) ); exit; }
  42 }
  43 else
  44 {  print json_encode( array( 'response' => 'error', 'cause' => 'config-error' ) ); exit; }
  45 /*******************************/
  46
  47 function new_key( $hex = false )
  48 {
  49         // Basically this is at the moment a slightly modified
  50         // version of generate_password() from user_functiions.php
  51         // The behaviour/output of this function is expected to change
  52         // so using generate_password() directly does not make sense...
  53         $length = 16;
  54         $string = "";
  55          while ( strlen( $string ) < $length )
  56          {
  57                 if ( $hex )
  58                         $string .= substr(md5(rand().rand()), 0, $length+1);
  59                 else
  60                 {
  61                         $string .= crypt( substr(sha1(rand()), 0, $length+1) );
  62                         $string = preg_replace( '/\W/', '', $string);
  63                 }
  64          }
  65         return substr( $string, 1, $length );
  66 }
  67
  68 function simple_authfail()
  69 {
  70         print json_encode( array( 'response' => 'failed', 'cause' => 'unauthorized', 'description' => 'Not authorized') );
  71         exit;
  72 }
  73
  74 function token_auth( )
  75 {
  76         global $_POST;
  77
  78         // TODO: Part of ping/pong requirement.
  79         // Run a function to clear all authkeys older than 5 minutes.
  80         expire_authkeys();
  81
  82         if ( array_key_exists('session', $_POST )
  83              && array_key_exists('auth_key', $_POST ) )
  84         {
  85                 if ( ! check_session($_POST['session'] ) ) simple_authfail();
  86                 if ( ! check_authkey($_POST['auth_key'] ) ) simple_authfail();
  87         }
  88         else simple_authfail();
  89 }
  90
  91 function get_cookie_path ()
  92 {
  93         $name = $_SERVER["SCRIPT_NAME"];
  94         $file = basename($name);
  95         $path = preg_replace("/".$file."/", "", $name);
  96         return $path;
  97
  98 }
  99
 100 function check_authkey ( $key )
 101 {
 102         // TODO: Make real, actual checks...
 103         if ( $key ) return true;
 104         return false;
 105 }
 106
 107 function expire_authkeys()
 108 {
 109         global $config;
 110
 111         // Force deletion of sessions that have expired keys.
 112         $query = sprintf("SELECT session, sessid FROM %s WHERE `last` < DATE_SUB( NOW(), INTERVAL %d MINUTE)",
 113                 $config['sessionkeys_table'],
 114                 $config['sessionkey_lifetime']);
 115         $result = sql_dbquery( $config['provision_db'], $query );
 116         while ( $row = @mysql_fetch_row( $result ) )
 117         {
 118                 remove_session( $row[0], $row[1] );
 119         }
 120
 121         $query = sprintf("DELETE FROM %s WHERE `last` < DATE_SUB( NOW(), INTERVAL %d MINUTE)",
 122                 $config['sessionkeys_table'],
 123                 $config['sessionkey_lifetime']);
 124
 125         sql_dbexec( $config['provision_db'], $query );
 126 }
 127
 128 function update_authkey ( $session, $authid )
 129 {
 130         global $config;
 131
 132         $key = substr(new_key(), 0, 8);
 133
 134         expire_authkeys();
 135
 136         // TODO: Refresh cookie
 137
 138         $remote = $_SERVER['REMOTE_ADDR'];
 139         $query = sprintf("INSERT INTO %s ( `sessid`, `session`, `authid`, `client`, `key`, `last` )
 140                                 VALUES ( '%s', '%s', '%s', '%s', '%s', NOW() )
 141                                 ON DUPLICATE KEY UPDATE `key` = '%s', `last` = NOW()",
 142                 $config['sessionkeys_table'],
 143                 session_id(),
 144                 session_name(),
 145                 sql_clean($authid),
 146                 sql_clean($remote),
 147                 sql_clean($key),
 148                 sql_clean($key));
 149         if ( ! sql_dbexec( $config['provision_db'], $query ) )
 150         {
 151                 mysql_error();
 152         }
 153         $_SESSION['kkey'] = $key;
 154         $_SESSION['when'] = time();
 155         return $key;
 156 }
 157
 158 function check_session ( $name )
 159 {
 160         session_name( $name );
 161         session_start();
 162         if ( ! $_SESSION['authid'] )
 163         {
 164                 return clear_credentials($name);
 165         }
 166         if ( ! $_COOKIE['client_key'] )
 167         {
 168                 return clear_credentials($name);
 169         }
 170
 171         $authid = $_SESSION['authid'];
 172         $type   = $_SESSION['type'];
 173         $client_key = $_COOKIE['client_key'];
 174
 175         $level = get_authorization( $type, $authid );
 176         if ( $level == false )
 177         {
 178                 return clear_credentials($name);
 179         }
 180
 181         $session_key = md5( $name . $authid );
 182         if ( $client_key != $session_key )
 183         {
 184                 return clear_credentials($name);
 185         }
 186
 187         // If we got this far, things are looking good.
 188         return true;
 189 }
 190
 191 function set_credentials( $authid, $type )
 192 {
 193         $name = new_key(true);
 194         session_name( $name );
 195         session_start();
 196         $_SESSION['authid'] = $authid;
 197         $_SESSION['type']   = $type;
 198
 199         $client_key  = md5( $name . $authid );
 200         setcookie('client_key', $client_key, time()+180*60, get_cookie_path() );
 201
 202         return $name;
 203 }
 204
 205 function clear_credentials($name)
 206 {
 207         global $config;
 208
 209         setcookie('client_key', '', 0, get_cookie_path() );
 210
 211         remove_session($name);
 212         $_SESSION = array();
 213
 214         $query = sprintf("DELETE FROM %s WHERE `session` = '%s'",
 215                 $config['sessionkeys_table'],
 216                 sql_clean($name));
 217         sql_dbexec( $config['provision_db'], $query );
 218
 219         return false;
 220 }
 221
 222 function remove_session ($name, $id = null )
 223 {
 224         if ( $id == null )
 225         {
 226                 session_destroy();
 227                 setcookie($name, '', 0, "/");
 228                 return;
 229         }
 230         $current_session = session_name( );
 231         $current_sessid = session_id( );
 232         session_commit();
 233
 234         session_id( $id );
 235         session_start();
 236         setcookie( $name, '', 0, "/");
 237         $_SESSION=array();
 238         session_destroy();
 239
 240         if ( $current_session && $current_session != $name )
 241         {
 242                 session_id($current_sessid);
 243                 session_start();
 244         }
 245 }
 246 function add_apikey ( $host, $level )
 247 {
 248         global $config;
 249         if ( !is_numeric($level) ) return false;
 250
 251         $key = new_key();
 252
 253         // Try to add the new key to authorizations first. If this
 254         // fails, there will be the least amount of data to clean up ...
 255         if ( ! update_authorization( "key", $key, $level ) ) return false;
 256
 257         $query = sprintf("INSERT INTO %s ( host, apikey ) VALUES ( '%s', '%s' )",
 258                 $config['apikeys_table'],
 259                 sql_clean($host),
 260                 sql_clean($key));
 261
 262         if ( ! sql_dbexec( $config['provision_db'], $query ) ) return false;
 263         return $key;
 264 }
 265
 266 function remove_apikey( $key )
 267 {
 268         global $config;
 269         if ( ! verify_apikey( $key, true ) ) return false;
 270         if ( ! remove_authorization( $key ) ) return false;
 271
 272         $query = sprintf("DELETE FROM %s WHERE apikey = '%s'",
 273                 $config['apikeys_table'],
 274                 sql_clean($key) );
 275         if ( ! sql_dbexec( $config['provision_db'], $query ) ) return false;
 276
 277         return true;
 278 }
 279
 280 function verify_apikey( $key, $skip_hostcheck = false )
 281 {
 282         global $config;
 283
 284         $query = sprintf("SELECT host FROM %s WHERE apikey = '%s'",
 285                 $config['apikeys_table'],
 286                 sql_clean($key) );
 287         $row = sql_dbquery_single( $config['provision_db'], $query );
 288         if  (!$row) return false;
 289         $host = $row['host'];
 290
 291         if ( $host && ( $skip_hostcheck ) )
 292                 return true;
 293
 294         if ( $host == $_SERVER['REMOTE_ADDR'] ) return true;
 295         return false;
 296
 297 }
 298
 299 function list_apikeys ()
 300 {
 301         global $config;
 302         $query = sprintf("SELECT k.apikey AS apikey, k.host AS host,
 303                                 a.access_level AS access_level
 304                                 FROM %s k INNER JOIN %s a ON k.apikey = a.authid
 305                                 WHERE a.type = 'key'",
 306                         $config['apikeys_table'],
 307                         $config['authorizations_table']);
 308         $list = array();
 309         $result = sql_dbquery( $config['provision_db'], $query);
 310         if ( ! $result ) return $list;
 311         while ( $row = @mysql_fetch_assoc( $result ) )
 312         {
 313                 array_push( $list, array(
 314                         'api_key' => $row['apikey'],
 315                         'host' => $row['host'],
 316                         'level' => authlevel_name( $row['access_level'] )
 317                 ));
 318         }
 319         return $list;
 320
 321 }
 322
 323 function list_authusers ()
 324 {
 325         global $config;
 326         $query = sprintf("SELECT authid, access_level
 327                                 FROM %s
 328                                 WHERE type = 'user'",
 329                         $config['authorizations_table']);
 330         $list = array();
 331         $result = sql_dbquery( $config['provision_db'], $query);
 332         if ( ! $result ) return $list;
 333         while ( $row = @mysql_fetch_assoc( $result ) )
 334         {
 335                 $username = $row['authid'];
 336                 $user_data = authuser_getinfo( $username );
 337
 338                 // TODO: Remove invalid users here?
 339                 if ( ! $user_data ) continue;
 340
 341                 array_push( $list, array(
 342                         'user' => $username,
 343                         'name' => $user_data['name'],
 344                         'email' => $user_data['email'],
 345                         'level' => authlevel_name( $row['access_level'] )
 346                 ));
 347         }
 348         return $list;
 349
 350 }
 351
 352
 353
 354 function update_authorization( $type, $authid, $level )
 355 {
 356         global $config;
 357         if ( !is_numeric($level) ) return false;
 358         if ( ($type != "key") && ($type != "user") ) return false;
 359
 360         $query = sprintf("INSERT INTO %s ( authid, type, access_level ) VALUES ( '%s', '%s', %d )
 361                         ON DUPLICATE KEY UPDATE access_level=%d",
 362                 $config['authorizations_table'],
 363                 sql_clean($authid),
 364                 $type,
 365                 $level, $level);
 366         if ( ! sql_dbexec( $config['provision_db'], $query ) ) return false;
 367         return true;
 368 }
 369
 370 function remove_authorization( $authid )
 371 {
 372         global $config;
 373         $query = sprintf("DELETE FROM %s WHERE authid = '%s'",
 374                 $config['authorizations_table'],
 375                 sql_clean($authid) );
 376         //print $query . "\n\n";
 377         if ( ! sql_dbexec( $config['provision_db'], $query ) ) return false;
 378         return true;
 379 }
 380
 381
 382 function get_authorization( $type, $authid )
 383 {
 384         global $config;
 385
 386         // If API-key is used, but key fails verification, write is impossible.
 387         if ( ( $type == "key" ) && ( ! verify_apikey( $authid, true ) ) )
 388                 return false;
 389
 390         // If User-login is used, but backend is unable to provide info, fail.
 391         if ( ( $type == "user" ) && ( ! authuser_getinfo( $authid ) ) )
 392                 return false;
 393
 394         // The only types of access control supported are "user" or "key".
 395         if ( ($type != "user" ) && ($type != "key") )
 396                 return false;
 397
 398         $query = sprintf("SELECT access_level FROM %s  WHERE authid = '%s'",
 399                 $config['authorizations_table'],
 400                 sql_clean($authid) );
 401         $row = sql_dbquery_single( $config['provision_db'], $query );
 402         if  (!$row) return false;
 403         $level = $row['access_level'];
 404         return $level;
 405 }
 406
 407 function can_write ( )
 408 {
 409         // Stub, to be called on any API nodes that write data in the DB.
 410         $authid = $_SESSION['authid'];
 411         $type   = $_SESSION['type'];
 412
 413         $level = get_authorization( $type, $authid );
 414         if ( $level >= authlevel_value('read_write') ) return $level;
 415         else return false;
 416 }
 417
 418 ?>