libraries/Config.class.php

   1 <?php
   2 /* vim: set expandtab sw=4 ts=4 sts=4: */
   3 /**
   4  *
   5  *
   6  * @package phpMyAdmin
   7  */
   8
   9 /**
  10  * Load vendor configuration.
  11  */
  12 require('./libraries/vendor_config.php');
  13
  14 /**
  15  * Configuration class
  16  *
  17  * @package phpMyAdmin
  18  */
  19 class PMA_Config
  20 {
  21     /**
  22      * @var string  default config source
  23      */
  24     var $default_source = './libraries/config.default.php';
  25
  26     /**
  27      * @var array   default configuration settings
  28      */
  29     var $default = array();
  30
  31     /**
  32      * @var array   configuration settings
  33      */
  34     var $settings = array();
  35
  36     /**
  37      * @var string  config source
  38      */
  39     var $source = '';
  40
  41     /**
  42      * @var int     source modification time
  43      */
  44     var $source_mtime = 0;
  45     var $default_source_mtime = 0;
  46     var $set_mtime = 0;
  47
  48     /**
  49      * @var boolean
  50      */
  51     var $error_config_file = false;
  52
  53     /**
  54      * @var boolean
  55      */
  56     var $error_config_default_file = false;
  57
  58     /**
  59      * @var boolean
  60      */
  61     var $error_pma_uri = false;
  62
  63     /**
  64      * @var array
  65      */
  66     var $default_server = array();
  67
  68     /**
  69      * @var boolean whether init is done or not
  70      * set this to false to force some initial checks
  71      * like checking for required functions
  72      */
  73     var $done = false;
  74
  75     /**
  76      * constructor
  77      *
  78      * @param   string  source to read config from
  79      */
  80     function __construct($source = null)
  81     {
  82         $this->settings = array();
  83
  84         // functions need to refresh in case of config file changed goes in
  85         // PMA_Config::load()
  86         $this->load($source);
  87
  88         // other settings, independent from config file, comes in
  89         $this->checkSystem();
  90
  91         $this->checkIsHttps();
  92     }
  93
  94     /**
  95      * sets system and application settings
  96      */
  97     function checkSystem()
  98     {
  99         $this->set('PMA_VERSION', '3.4.1-dev');
 100         /**
 101          * @deprecated
 102          */
 103         $this->set('PMA_THEME_VERSION', 2);
 104         /**
 105          * @deprecated
 106          */
 107         $this->set('PMA_THEME_GENERATION', 2);
 108
 109         $this->checkPhpVersion();
 110         $this->checkWebServerOs();
 111         $this->checkWebServer();
 112         $this->checkGd2();
 113         $this->checkClient();
 114         $this->checkUpload();
 115         $this->checkUploadSize();
 116         $this->checkOutputCompression();
 117     }
 118
 119     /**
 120      * whether to use gzip output compression or not
 121      */
 122     function checkOutputCompression()
 123     {
 124         // If zlib output compression is set in the php configuration file, no
 125         // output buffering should be run
 126         if (@ini_get('zlib.output_compression')) {
 127             $this->set('OBGzip', false);
 128         }
 129
 130         // disable output-buffering (if set to 'auto') for IE6, else enable it.
 131         if (strtolower($this->get('OBGzip')) == 'auto') {
 132             if ($this->get('PMA_USR_BROWSER_AGENT') == 'IE'
 133               && $this->get('PMA_USR_BROWSER_VER') >= 6
 134               && $this->get('PMA_USR_BROWSER_VER') < 7) {
 135                 $this->set('OBGzip', false);
 136             } else {
 137                 $this->set('OBGzip', true);
 138             }
 139         }
 140     }
 141
 142     /**
 143      * Determines platform (OS), browser and version of the user
 144      * Based on a phpBuilder article:
 145      * @see http://www.phpbuilder.net/columns/tim20000821.php
 146      */
 147     function checkClient()
 148     {
 149         if (PMA_getenv('HTTP_USER_AGENT')) {
 150             $HTTP_USER_AGENT = PMA_getenv('HTTP_USER_AGENT');
 151         } elseif (!isset($HTTP_USER_AGENT)) {
 152             $HTTP_USER_AGENT = '';
 153         }
 154
 155         // 1. Platform
 156         if (strstr($HTTP_USER_AGENT, 'Win')) {
 157             $this->set('PMA_USR_OS', 'Win');
 158         } elseif (strstr($HTTP_USER_AGENT, 'Mac')) {
 159             $this->set('PMA_USR_OS', 'Mac');
 160         } elseif (strstr($HTTP_USER_AGENT, 'Linux')) {
 161             $this->set('PMA_USR_OS', 'Linux');
 162         } elseif (strstr($HTTP_USER_AGENT, 'Unix')) {
 163             $this->set('PMA_USR_OS', 'Unix');
 164         } elseif (strstr($HTTP_USER_AGENT, 'OS/2')) {
 165             $this->set('PMA_USR_OS', 'OS/2');
 166         } else {
 167             $this->set('PMA_USR_OS', 'Other');
 168         }
 169
 170         // 2. browser and version
 171         // (must check everything else before Mozilla)
 172
 173         if (preg_match('@Opera(/| )([0-9].[0-9]{1,2})@', $HTTP_USER_AGENT, $log_version)) {
 174             $this->set('PMA_USR_BROWSER_VER', $log_version[2]);
 175             $this->set('PMA_USR_BROWSER_AGENT', 'OPERA');
 176         } elseif (preg_match('@MSIE ([0-9].[0-9]{1,2})@', $HTTP_USER_AGENT, $log_version)) {
 177             $this->set('PMA_USR_BROWSER_VER', $log_version[1]);
 178             $this->set('PMA_USR_BROWSER_AGENT', 'IE');
 179         } elseif (preg_match('@OmniWeb/([0-9].[0-9]{1,2})@', $HTTP_USER_AGENT, $log_version)) {
 180             $this->set('PMA_USR_BROWSER_VER', $log_version[1]);
 181             $this->set('PMA_USR_BROWSER_AGENT', 'OMNIWEB');
 182         // Konqueror 2.2.2 says Konqueror/2.2.2
 183         // Konqueror 3.0.3 says Konqueror/3
 184         } elseif (preg_match('@(Konqueror/)(.*)(;)@', $HTTP_USER_AGENT, $log_version)) {
 185             $this->set('PMA_USR_BROWSER_VER', $log_version[2]);
 186             $this->set('PMA_USR_BROWSER_AGENT', 'KONQUEROR');
 187         } elseif (preg_match('@Mozilla/([0-9].[0-9]{1,2})@', $HTTP_USER_AGENT, $log_version)
 188                    && preg_match('@Safari/([0-9]*)@', $HTTP_USER_AGENT, $log_version2)) {
 189             $this->set('PMA_USR_BROWSER_VER', $log_version[1] . '.' . $log_version2[1]);
 190             $this->set('PMA_USR_BROWSER_AGENT', 'SAFARI');
 191         } elseif (preg_match('@rv:1.9(.*)Gecko@', $HTTP_USER_AGENT)) {
 192             $this->set('PMA_USR_BROWSER_VER', '1.9');
 193             $this->set('PMA_USR_BROWSER_AGENT', 'GECKO');
 194         } elseif (preg_match('@Mozilla/([0-9].[0-9]{1,2})@', $HTTP_USER_AGENT, $log_version)) {
 195             $this->set('PMA_USR_BROWSER_VER', $log_version[1]);
 196             $this->set('PMA_USR_BROWSER_AGENT', 'MOZILLA');
 197         } else {
 198             $this->set('PMA_USR_BROWSER_VER', 0);
 199             $this->set('PMA_USR_BROWSER_AGENT', 'OTHER');
 200         }
 201     }
 202
 203     /**
 204      * Whether GD2 is present
 205      */
 206     function checkGd2()
 207     {
 208         if ($this->get('GD2Available') == 'yes') {
 209             $this->set('PMA_IS_GD2', 1);
 210         } elseif ($this->get('GD2Available') == 'no') {
 211             $this->set('PMA_IS_GD2', 0);
 212         } else {
 213             if (!@function_exists('imagecreatetruecolor')) {
 214                 $this->set('PMA_IS_GD2', 0);
 215             } else {
 216                 if (@function_exists('gd_info')) {
 217                     $gd_nfo = gd_info();
 218                     if (strstr($gd_nfo["GD Version"], '2.')) {
 219                         $this->set('PMA_IS_GD2', 1);
 220                     } else {
 221                         $this->set('PMA_IS_GD2', 0);
 222                     }
 223                 } else {
 224                     /* We must do hard way... but almost no chance to execute this */
 225                     ob_start();
 226                     phpinfo(INFO_MODULES); /* Only modules */
 227                     $a = strip_tags(ob_get_contents());
 228                     ob_end_clean();
 229                     /* Get GD version string from phpinfo output */
 230                     if (preg_match('@GD Version[[:space:]]*\(.*\)@', $a, $v)) {
 231                         if (strstr($v, '2.')) {
 232                             $this->set('PMA_IS_GD2', 1);
 233                         } else {
 234                             $this->set('PMA_IS_GD2', 0);
 235                         }
 236                     } else {
 237                         $this->set('PMA_IS_GD2', 0);
 238                     }
 239                 }
 240             }
 241         }
 242     }
 243
 244     /**
 245      * Whether the Web server php is running on is IIS
 246      */
 247     function checkWebServer()
 248     {
 249         if (PMA_getenv('SERVER_SOFTWARE')
 250           // some versions return Microsoft-IIS, some Microsoft/IIS
 251           // we could use a preg_match() but it's slower
 252           && stristr(PMA_getenv('SERVER_SOFTWARE'), 'Microsoft')
 253           && stristr(PMA_getenv('SERVER_SOFTWARE'), 'IIS')) {
 254             $this->set('PMA_IS_IIS', 1);
 255         } else {
 256             $this->set('PMA_IS_IIS', 0);
 257         }
 258     }
 259
 260     /**
 261      * Whether the os php is running on is windows or not
 262      */
 263     function checkWebServerOs()
 264     {
 265         // Default to Unix or Equiv
 266         $this->set('PMA_IS_WINDOWS', 0);
 267         // If PHP_OS is defined then continue
 268         if (defined('PHP_OS')) {
 269             if (stristr(PHP_OS, 'win')) {
 270                 // Is it some version of Windows
 271                 $this->set('PMA_IS_WINDOWS', 1);
 272             } elseif (stristr(PHP_OS, 'OS/2')) {
 273                 // Is it OS/2 (No file permissions like Windows)
 274                 $this->set('PMA_IS_WINDOWS', 1);
 275             }
 276         }
 277     }
 278
 279     /**
 280      * detects PHP version
 281      */
 282     function checkPhpVersion()
 283     {
 284         $match = array();
 285         if (! preg_match('@([0-9]{1,2}).([0-9]{1,2}).([0-9]{1,2})@',
 286                 phpversion(), $match)) {
 287             $result = preg_match('@([0-9]{1,2}).([0-9]{1,2})@',
 288                 phpversion(), $match);
 289         }
 290         if (isset($match) && ! empty($match[1])) {
 291             if (! isset($match[2])) {
 292                 $match[2] = 0;
 293             }
 294             if (! isset($match[3])) {
 295                 $match[3] = 0;
 296             }
 297             $this->set('PMA_PHP_INT_VERSION',
 298                 (int) sprintf('%d%02d%02d', $match[1], $match[2], $match[3]));
 299         } else {
 300             $this->set('PMA_PHP_INT_VERSION', 0);
 301         }
 302         $this->set('PMA_PHP_STR_VERSION', phpversion());
 303     }
 304
 305     /**
 306      * loads default values from default source
 307      *
 308      * @uses    file_exists()
 309      * @uses    $this->default_source
 310      * @uses    $this->error_config_default_file
 311      * @uses    $this->settings
 312      * @return  boolean     success
 313      */
 314     function loadDefaults()
 315     {
 316         $cfg = array();
 317         if (! file_exists($this->default_source)) {
 318             $this->error_config_default_file = true;
 319             return false;
 320         }
 321         include $this->default_source;
 322
 323         $this->default_source_mtime = filemtime($this->default_source);
 324
 325         $this->default_server = $cfg['Servers'][1];
 326         unset($cfg['Servers']);
 327
 328         $this->default = $cfg;
 329         $this->settings = PMA_array_merge_recursive($this->settings, $cfg);
 330
 331         $this->error_config_default_file = false;
 332
 333         return true;
 334     }
 335
 336     /**
 337      * loads configuration from $source, usally the config file
 338      * should be called on object creation
 339      *
 340      * @param   string $source  config file
 341      */
 342     function load($source = null)
 343     {
 344         $this->loadDefaults();
 345
 346         if (null !== $source) {
 347             $this->setSource($source);
 348         }
 349
 350         if (! $this->checkConfigSource()) {
 351             return false;
 352         }
 353
 354         $cfg = array();
 355
 356         /**
 357          * Parses the configuration file
 358          */
 359         $old_error_reporting = error_reporting(0);
 360         if (function_exists('file_get_contents')) {
 361             $eval_result =
 362                 eval('?' . '>' . trim(file_get_contents($this->getSource())));
 363         } else {
 364             $eval_result =
 365                 eval('?' . '>' . trim(implode("\n", file($this->getSource()))));
 366         }
 367         error_reporting($old_error_reporting);
 368
 369         if ($eval_result === false) {
 370             $this->error_config_file = true;
 371         } else  {
 372             $this->error_config_file = false;
 373             $this->source_mtime = filemtime($this->getSource());
 374         }
 375
 376         /**
 377          * Backward compatibility code
 378          */
 379         if (!empty($cfg['DefaultTabTable'])) {
 380             $cfg['DefaultTabTable'] = str_replace('_properties', '', str_replace('tbl_properties.php', 'tbl_sql.php', $cfg['DefaultTabTable']));
 381         }
 382         if (!empty($cfg['DefaultTabDatabase'])) {
 383             $cfg['DefaultTabDatabase'] = str_replace('_details', '', str_replace('db_details.php', 'db_sql.php', $cfg['DefaultTabDatabase']));
 384         }
 385
 386         $this->settings = PMA_array_merge_recursive($this->settings, $cfg);
 387         $this->checkPmaAbsoluteUri();
 388         $this->checkFontsize();
 389
 390         $this->checkPermissions();
 391
 392         // Handling of the collation must be done after merging of $cfg
 393         // (from config.inc.php) so that $cfg['DefaultConnectionCollation']
 394         // can have an effect. Note that the presence of collation
 395         // information in a cookie has priority over what is defined
 396         // in the default or user's config files.
 397         /**
 398          * @todo check validity of $_COOKIE['pma_collation_connection']
 399          */
 400         if (! empty($_COOKIE['pma_collation_connection'])) {
 401             $this->set('collation_connection',
 402                 strip_tags($_COOKIE['pma_collation_connection']));
 403         } else {
 404             $this->set('collation_connection',
 405                 $this->get('DefaultConnectionCollation'));
 406         }
 407         // Now, a collation information could come from REQUEST
 408         // (an example of this: the collation selector in main.php)
 409         // so the following handles the setting of collation_connection
 410         // and later, in common.inc.php, the cookie will be set
 411         // according to this.
 412         $this->checkCollationConnection();
 413
 414         return true;
 415     }
 416
 417     /**
 418      * Loads user preferences and merges them with current config
 419      * must be called after control connection has been estabilished
 420      *
 421      * @uses $GLOBALS['cfg']
 422      * @uses $GLOBALS['collation_connection']
 423      * @uses $GLOBALS['lang']
 424      * @uses $_SESSION['cache']['server_$server']['config_mtime']
 425      * @uses $_SESSION['cache']['server_$server']['userprefs']
 426      * @uses $_SESSION['cache']['server_$server']['userprefs_mtime']
 427      * @uses $_SESSION['PMA_Theme_Manager']
 428      * @uses PMA_apply_userprefs()
 429      * @uses PMA_array_merge_recursive()
 430      * @uses PMA_load_userprefs()
 431      * @return boolean
 432      */
 433     function loadUserPreferences()
 434     {
 435         // index.php should load these settings, so that phpmyadmin.css.php
 436         // will have everything avaiable in session cache
 437         $server = isset($GLOBALS['server'])
 438             ? $GLOBALS['server']
 439             : (!empty($GLOBALS['cfg']['ServerDefault']) ? $GLOBALS['cfg']['ServerDefault'] : 0);
 440         $cache_key = 'server_' . $server;
 441         if ($server > 0 && !defined('PMA_MINIMUM_COMMON')) {
 442             $config_mtime = max($this->default_source_mtime, $this->source_mtime);
 443             // cache user preferences, use database only when needed
 444             if (!isset($_SESSION['cache'][$cache_key]['userprefs'])
 445                     || $_SESSION['cache'][$cache_key]['config_mtime'] < $config_mtime) {
 446                 // load required libraries
 447                 require_once './libraries/user_preferences.lib.php';
 448                 $prefs = PMA_load_userprefs();
 449                 $_SESSION['cache'][$cache_key]['userprefs'] = PMA_apply_userprefs($prefs['config_data']);
 450                 $_SESSION['cache'][$cache_key]['userprefs_mtime'] = $prefs['mtime'];
 451                 $_SESSION['cache'][$cache_key]['userprefs_type'] = $prefs['type'];
 452                 $_SESSION['cache'][$cache_key]['config_mtime'] = $config_mtime;
 453             }
 454         } else if ($server == 0 || !isset($_SESSION['cache'][$cache_key]['userprefs'])) {
 455             $this->set('user_preferences', false);
 456             return;
 457         }
 458         $config_data = $_SESSION['cache'][$cache_key]['userprefs'];
 459         // type is 'db' or 'session'
 460         $this->set('user_preferences', $_SESSION['cache'][$cache_key]['userprefs_type']);
 461         $this->set('user_preferences_mtime', $_SESSION['cache'][$cache_key]['userprefs_mtime']);
 462
 463         // backup some settings
 464         $org_fontsize = $this->settings['fontsize'];
 465         // load config array
 466         $this->settings = PMA_array_merge_recursive($this->settings, $config_data);
 467         $GLOBALS['cfg'] = PMA_array_merge_recursive($GLOBALS['cfg'], $config_data);
 468         if (defined('PMA_MINIMUM_COMMON')) {
 469             return;
 470         }
 471
 472         // settings below start really working on next page load, but
 473         // changes are made only in index.php so everything is set when
 474         // in frames
 475
 476         // save theme
 477         $tmanager = $_SESSION['PMA_Theme_Manager'];
 478         if ($tmanager->getThemeCookie() || isset($_REQUEST['set_theme'])) {
 479             if ((!isset($config_data['ThemeDefault']) && $tmanager->theme->getId() != 'original')
 480                     || isset($config_data['ThemeDefault']) && $config_data['ThemeDefault'] != $tmanager->theme->getId()) {
 481                 // new theme was set in common.inc.php
 482                 $this->setUserValue(null, 'ThemeDefault', $tmanager->theme->getId(), 'original');
 483             }
 484         } else {
 485             // no cookie - read default from settings
 486             if ($this->settings['ThemeDefault'] != $tmanager->theme->getId()
 487                     && $tmanager->checkTheme($this->settings['ThemeDefault'])) {
 488                 $tmanager->setActiveTheme($this->settings['ThemeDefault']);
 489                 $tmanager->setThemeCookie();
 490             }
 491         }
 492
 493         // save font size
 494         if ((!isset($config_data['fontsize']) && $org_fontsize != '82%')
 495                 || isset($config_data['fontsize']) && $org_fontsize != $config_data['fontsize']) {
 496             $this->setUserValue(null, 'fontsize', $org_fontsize, '82%');
 497         }
 498
 499         // save language
 500         if (isset($_COOKIE['pma_lang']) || isset($_POST['lang'])) {
 501             if ((!isset($config_data['lang']) && $GLOBALS['lang'] != 'en')
 502                     || isset($config_data['lang']) && $GLOBALS['lang'] != $config_data['lang']) {
 503                 $this->setUserValue(null, 'lang', $GLOBALS['lang'], 'en');
 504             }
 505         } else {
 506             // read language from settings
 507             if (isset($config_data['lang']) && PMA_langSet($config_data['lang'])) {
 508                 $this->setCookie('pma_lang', $GLOBALS['lang']);
 509             }
 510         }
 511
 512         // save connection collation
 513         if (isset($_COOKIE['pma_collation_connection']) || isset($_POST['collation_connection'])) {
 514             if ((!isset($config_data['collation_connection']) && $GLOBALS['collation_connection'] != 'utf8_general_ci')
 515                     || isset($config_data['collation_connection']) && $GLOBALS['collation_connection'] != $config_data['collation_connection']) {
 516                 $this->setUserValue(null, 'collation_connection', $GLOBALS['collation_connection'], 'utf8_general_ci');
 517             }
 518         } else {
 519             // read collation from settings
 520             if (isset($config_data['collation_connection'])) {
 521                 $GLOBALS['collation_connection'] = $config_data['collation_connection'];
 522                 $this->setCookie('pma_collation_connection', $GLOBALS['collation_connection']);
 523             }
 524         }
 525     }
 526
 527     /**
 528      * Sets config value which is stored in user preferences (if available) or in a cookie.
 529      *
 530      * If user preferences are not yet initialized, option is applied to global config and
 531      * added to a update queue, which is processed by {@link loadUserPreferences()}
 532      *
 533      * @uses $GLOBALS['cfg']
 534      * @uses PMA_array_read()
 535      * @uses PMA_array_write()
 536      * @uses PMA_persist_option()
 537      * @param string $cookie_name can be null
 538      * @param string $cfg_path
 539      * @param mixed  $new_cfg_value
 540      * @param mixed  $default_value
 541      */
 542     function setUserValue($cookie_name, $cfg_path, $new_cfg_value, $default_value = null)
 543     {
 544         // use permanent user preferences if possible
 545         $prefs_type = $this->get('user_preferences');
 546         if ($prefs_type) {
 547             require_once './libraries/user_preferences.lib.php';
 548             if ($default_value === null) {
 549                 $default_value = PMA_array_read($cfg_path, $this->default);
 550             }
 551             PMA_persist_option($cfg_path, $new_cfg_value, $default_value);
 552         }
 553         if ($prefs_type != 'db' && $cookie_name) {
 554             // fall back to cookies
 555             if ($default_value === null) {
 556                 $default_value = PMA_array_read($cfg_path, $this->settings);
 557             }
 558             $this->setCookie($cookie_name, $new_cfg_value, $default_value);
 559         }
 560         PMA_array_write($cfg_path, $GLOBALS['cfg'], $new_cfg_value);
 561         PMA_array_write($cfg_path, $this->settings, $new_cfg_value);
 562     }
 563
 564     /**
 565      * Reads value stored by {@link setUserValue()}
 566      *
 567      * @param string $cookie_name
 568      * @param mixed $cfg_value
 569      * @return mixed
 570      */
 571     function getUserValue($cookie_name, $cfg_value)
 572     {
 573         $cookie_exists = isset($_COOKIE) && !empty($_COOKIE[$cookie_name]);
 574         $prefs_type = $this->get('user_preferences');
 575         if ($prefs_type == 'db') {
 576             // permanent user preferences value exists, remove cookie
 577             if ($cookie_exists) {
 578                 $this->removeCookie($cookie_name);
 579             }
 580         } else if ($cookie_exists) {
 581             return $_COOKIE[$cookie_name];
 582         }
 583         // return value from $cfg array
 584         return $cfg_value;
 585     }
 586
 587     /**
 588      * set source
 589      * @param   string  $source
 590      */
 591     function setSource($source)
 592     {
 593         $this->source = trim($source);
 594     }
 595
 596     /**
 597      * checks if the config folder still exists and terminates app if true
 598      */
 599     function checkConfigFolder()
 600     {
 601         // Refuse to work while there still might be some world writable dir:
 602         if (is_dir('./config')) {
 603             die('Remove "./config" directory before using phpMyAdmin!');
 604         }
 605     }
 606
 607     /**
 608      * check config source
 609      *
 610      * @return  boolean whether source is valid or not
 611      */
 612     function checkConfigSource()
 613     {
 614         if (! $this->getSource()) {
 615             // no configuration file set at all
 616             return false;
 617         }
 618
 619         if (! file_exists($this->getSource())) {
 620             // do not trigger error here
 621             // https://sf.net/tracker/?func=detail&aid=1370269&group_id=23067&atid=377408
 622             /*
 623             trigger_error(
 624                 'phpMyAdmin-ERROR: unkown configuration source: ' . $source,
 625                 E_USER_WARNING);
 626             */
 627             $this->source_mtime = 0;
 628             return false;
 629         }
 630
 631         if (! is_readable($this->getSource())) {
 632             $this->source_mtime = 0;
 633             die('Existing configuration file (' . $this->getSource() . ') is not readable.');
 634         }
 635
 636         return true;
 637     }
 638
 639     /**
 640      * verifies the permissions on config file (if asked by configuration)
 641      * (must be called after config.inc.php has been merged)
 642      */
 643     function checkPermissions()
 644     {
 645         // Check for permissions (on platforms that support it):
 646         if ($this->get('CheckConfigurationPermissions')) {
 647             $perms = @fileperms($this->getSource());
 648             if (!($perms === false) && ($perms & 2)) {
 649                 // This check is normally done after loading configuration
 650                 $this->checkWebServerOs();
 651                 if ($this->get('PMA_IS_WINDOWS') == 0) {
 652                     $this->source_mtime = 0;
 653                     die('Wrong permissions on configuration file, should not be world writable!');
 654                 }
 655             }
 656         }
 657     }
 658
 659     /**
 660      * returns specific config setting
 661      * @param   string  $setting
 662      * @return  mixed   value
 663      */
 664     function get($setting)
 665     {
 666         if (isset($this->settings[$setting])) {
 667             return $this->settings[$setting];
 668         }
 669         return null;
 670     }
 671
 672     /**
 673      * sets configuration variable
 674      *
 675      * @uses    $this->settings
 676      * @param   string  $setting    configuration option
 677      * @param   string  $value      new value for configuration option
 678      */
 679     function set($setting, $value)
 680     {
 681         if (!isset($this->settings[$setting]) || $this->settings[$setting] != $value) {
 682             $this->settings[$setting] = $value;
 683             $this->set_mtime = time();
 684         }
 685     }
 686
 687     /**
 688      * returns source for current config
 689      * @return  string  config source
 690      */
 691     function getSource()
 692     {
 693         return $this->source;
 694     }
 695
 696     /**
 697      * returns a unique value to force a CSS reload if either the config
 698      * or the theme changes
 699      * must also check the pma_fontsize cookie in case there is no
 700      * config file
 701      * @return  int  Unix timestamp
 702      */
 703     function getThemeUniqueValue()
 704     {
 705         if (null !== $this->get('fontsize')) {
 706             $fontsize = intval($this->get('fontsize'));
 707         } elseif (isset($_COOKIE['pma_fontsize'])) {
 708             $fontsize = intval($_COOKIE['pma_fontsize']);
 709         } else {
 710             $fontsize = 0;
 711         }
 712         return (
 713             $fontsize +
 714             $this->source_mtime +
 715             $this->default_source_mtime +
 716             $this->get('user_preferences_mtime') +
 717             $_SESSION['PMA_Theme']->mtime_info +
 718             $_SESSION['PMA_Theme']->filesize_info)
 719             . (isset($_SESSION['tmp_user_values']['custom_color']) ? substr($_SESSION['tmp_user_values']['custom_color'],1,6) : '');
 720     }
 721
 722     /**
 723      * $cfg['PmaAbsoluteUri'] is a required directive else cookies won't be
 724      * set properly and, depending on browsers, inserting or updating a
 725      * record might fail
 726      */
 727     function checkPmaAbsoluteUri()
 728     {
 729         // Setup a default value to let the people and lazy sysadmins work anyway,
 730         // they'll get an error if the autodetect code doesn't work
 731         $pma_absolute_uri = $this->get('PmaAbsoluteUri');
 732         $is_https = $this->detectHttps();
 733
 734         if (strlen($pma_absolute_uri) < 5) {
 735             $url = array();
 736
 737             // At first we try to parse REQUEST_URI, it might contain full URL
 738             /**
 739              * REQUEST_URI contains PATH_INFO too, this is not what we want
 740              * script-php/pathinfo/
 741             if (PMA_getenv('REQUEST_URI')) {
 742                 $url = @parse_url(PMA_getenv('REQUEST_URI')); // produces E_WARNING if it cannot get parsed, e.g. '/foobar:/'
 743                 if ($url === false) {
 744                     $url = array('path' => $_SERVER['REQUEST_URI']);
 745                 }
 746             }
 747              */
 748
 749             // If we don't have scheme, we didn't have full URL so we need to
 750             // dig deeper
 751             if (empty($url['scheme'])) {
 752                 // Scheme
 753                 if (PMA_getenv('HTTP_SCHEME')) {
 754                     $url['scheme'] = PMA_getenv('HTTP_SCHEME');
 755                 } else {
 756                     $url['scheme'] =
 757                         PMA_getenv('HTTPS') && strtolower(PMA_getenv('HTTPS')) != 'off'
 758                             ? 'https'
 759                             : 'http';
 760                 }
 761
 762                 // Host and port
 763                 if (PMA_getenv('HTTP_HOST')) {
 764                     // Prepend the scheme before using parse_url() since this is not part of the RFC2616 Host request-header
 765                     $parsed_url = parse_url($url['scheme'] . '://' . PMA_getenv('HTTP_HOST'));
 766                     if (!empty($parsed_url['host'])) {
 767                         $url = $parsed_url;
 768                     } else {
 769                         $url['host'] = PMA_getenv('HTTP_HOST');
 770                     }
 771                 } elseif (PMA_getenv('SERVER_NAME')) {
 772                     $url['host'] = PMA_getenv('SERVER_NAME');
 773                 } else {
 774                     $this->error_pma_uri = true;
 775                     return false;
 776                 }
 777
 778                 // If we didn't set port yet...
 779                 if (empty($url['port']) && PMA_getenv('SERVER_PORT')) {
 780                     $url['port'] = PMA_getenv('SERVER_PORT');
 781                 }
 782
 783                 // And finally the path could be already set from REQUEST_URI
 784                 if (empty($url['path'])) {
 785                     /**
 786                      * REQUEST_URI contains PATH_INFO too, this is not what we want
 787                      * script-php/pathinfo/
 788                     if (PMA_getenv('PATH_INFO')) {
 789                         $path = parse_url(PMA_getenv('PATH_INFO'));
 790                     } else {
 791                         // PHP_SELF in CGI often points to cgi executable, so use it
 792                         // as last choice
 793                      */
 794                         $path = parse_url($GLOBALS['PMA_PHP_SELF']);
 795                     //}
 796                     $url['path'] = $path['path'];
 797                 }
 798             }
 799
 800             // Make url from parts we have
 801             $pma_absolute_uri = $url['scheme'] . '://';
 802             // Was there user information?
 803             if (!empty($url['user'])) {
 804                 $pma_absolute_uri .= $url['user'];
 805                 if (!empty($url['pass'])) {
 806                     $pma_absolute_uri .= ':' . $url['pass'];
 807                 }
 808                 $pma_absolute_uri .= '@';
 809             }
 810             // Add hostname
 811             $pma_absolute_uri .= $url['host'];
 812             // Add port, if it not the default one
 813             if (! empty($url['port'])
 814               && (($url['scheme'] == 'http' && $url['port'] != 80)
 815                 || ($url['scheme'] == 'https' && $url['port'] != 443))) {
 816                 $pma_absolute_uri .= ':' . $url['port'];
 817             }
 818             // And finally path, without script name, the 'a' is there not to
 819             // strip our directory, when path is only /pmadir/ without filename.
 820             // Backslashes returned by Windows have to be changed.
 821             // Only replace backslashes by forward slashes if on Windows,
 822             // as the backslash could be valid on a non-Windows system.
 823             $this->checkWebServerOs();
 824             if ($this->get('PMA_IS_WINDOWS') == 1) {
 825                 $path = str_replace("\\", "/", dirname($url['path'] . 'a'));
 826             } else {
 827                 $path = dirname($url['path'] . 'a');
 828             }
 829
 830             // To work correctly within transformations overview:
 831             if (defined('PMA_PATH_TO_BASEDIR') && PMA_PATH_TO_BASEDIR == '../../') {
 832                 if ($this->get('PMA_IS_WINDOWS') == 1) {
 833                     $path = str_replace("\\", "/", dirname(dirname($path)));
 834                 } else {
 835                     $path = dirname(dirname($path));
 836                 }
 837             }
 838
 839             // PHP's dirname function would have returned a dot when $path contains no slash
 840             if ($path == '.') {
 841                 $path = '';
 842             }
 843             // in vhost situations, there could be already an ending slash
 844             if (substr($path, -1) != '/') {
 845                 $path .= '/';
 846             }
 847             $pma_absolute_uri .= $path;
 848
 849             // We used to display a warning if PmaAbsoluteUri wasn't set, but now
 850             // the autodetect code works well enough that we don't display the
 851             // warning at all. The user can still set PmaAbsoluteUri manually.
 852             // See
 853             // http://sf.net/tracker/?func=detail&aid=1257134&group_id=23067&atid=377411
 854
 855         } else {
 856             // The URI is specified, however users do often specify this
 857             // wrongly, so we try to fix this.
 858
 859             // Adds a trailing slash et the end of the phpMyAdmin uri if it
 860             // does not exist.
 861             if (substr($pma_absolute_uri, -1) != '/') {
 862                 $pma_absolute_uri .= '/';
 863             }
 864
 865             // If URI doesn't start with http:// or https://, we will add
 866             // this.
 867             if (substr($pma_absolute_uri, 0, 7) != 'http://'
 868               && substr($pma_absolute_uri, 0, 8) != 'https://') {
 869                 $pma_absolute_uri =
 870                     ($is_https ? 'https' : 'http')
 871                     . ':' . (substr($pma_absolute_uri, 0, 2) == '//' ? '' : '//')
 872                     . $pma_absolute_uri;
 873             }
 874         }
 875         $this->set('PmaAbsoluteUri', $pma_absolute_uri);
 876     }
 877
 878     /**
 879      * check selected collation_connection
 880      * @todo check validity of $_REQUEST['collation_connection']
 881      */
 882     function checkCollationConnection()
 883     {
 884         if (! empty($_REQUEST['collation_connection'])) {
 885             $this->set('collation_connection',
 886                 strip_tags($_REQUEST['collation_connection']));
 887         }
 888     }
 889
 890     /**
 891      * checks for font size configuration, and sets font size as requested by user
 892      *
 893      * @uses    $_GET
 894      * @uses    $_POST
 895      * @uses    $_COOKIE
 896      * @uses    preg_match()
 897      * @uses    function_exists()
 898      * @uses    PMA_Config::set()
 899      * @uses    PMA_Config::get()
 900      * @uses    PMA_Config::setCookie()
 901      */
 902     function checkFontsize()
 903     {
 904         $new_fontsize = '';
 905
 906         if (isset($_GET['set_fontsize'])) {
 907             $new_fontsize = $_GET['set_fontsize'];
 908         } elseif (isset($_POST['set_fontsize'])) {
 909             $new_fontsize = $_POST['set_fontsize'];
 910         } elseif (isset($_COOKIE['pma_fontsize'])) {
 911             $new_fontsize = $_COOKIE['pma_fontsize'];
 912         }
 913
 914         if (preg_match('/^[0-9.]+(px|em|pt|\%)$/', $new_fontsize)) {
 915             $this->set('fontsize', $new_fontsize);
 916         } elseif (! $this->get('fontsize')) {
 917             // 80% would correspond to the default browser font size
 918             // of 16, but use 82% to help read the monoface font
 919             $this->set('fontsize', '82%');
 920         }
 921
 922         $this->setCookie('pma_fontsize', $this->get('fontsize'), '82%');
 923     }
 924
 925     /**
 926      * checks if upload is enabled
 927      *
 928      */
 929
 930     function checkUpload()
 931     {
 932         if (ini_get('file_uploads')) {
 933             $this->set('enable_upload', true);
 934             // if set "php_admin_value file_uploads Off" in httpd.conf
 935             // ini_get() also returns the string "Off" in this case:
 936             if ('off' == strtolower(ini_get('file_uploads'))) {
 937                 $this->set('enable_upload', false);
 938             }
 939          } else {
 940             $this->set('enable_upload', false);
 941          }
 942     }
 943
 944     /**
 945      * Maximum upload size as limited by PHP
 946      * Used with permission from Moodle (http://moodle.org) by Martin Dougiamas
 947      *
 948      * this section generates $max_upload_size in bytes
 949      */
 950     function checkUploadSize()
 951     {
 952         if (! $filesize = ini_get('upload_max_filesize')) {
 953             $filesize = "5M";
 954         }
 955
 956         if ($postsize = ini_get('post_max_size')) {
 957             $this->set('max_upload_size',
 958                 min(PMA_get_real_size($filesize), PMA_get_real_size($postsize)));
 959         } else {
 960             $this->set('max_upload_size', PMA_get_real_size($filesize));
 961         }
 962     }
 963
 964     /**
 965      * check for https
 966      */
 967     function checkIsHttps()
 968     {
 969         $this->set('is_https', $this->isHttps());
 970     }
 971
 972     /**
 973      * @static
 974      */
 975     public function isHttps()
 976     {
 977         static $is_https = null;
 978
 979         if (null !== $is_https) {
 980             return $is_https;
 981         }
 982
 983         $url = parse_url($this->get('PmaAbsoluteUri'));
 984
 985         if (isset($url['scheme'])
 986           && $url['scheme'] == 'https') {
 987             $is_https = true;
 988         } else {
 989             $is_https = false;
 990         }
 991
 992         return $is_https;
 993     }
 994
 995     /**
 996      * Detects whether https appears to be used.
 997      *
 998      * Please note that this just detects what we see, so
 999      * it completely ignores things like reverse proxies.
1000      */
1001     function detectHttps()
1002     {
1003         $is_https = false;
1004
1005         $url = array();
1006
1007         // At first we try to parse REQUEST_URI, it might contain full URL,
1008         if (PMA_getenv('REQUEST_URI')) {
1009             $url = @parse_url(PMA_getenv('REQUEST_URI')); // produces E_WARNING if it cannot get parsed, e.g. '/foobar:/'
1010             if($url === false) {
1011                 $url = array();
1012             }
1013         }
1014
1015         // If we don't have scheme, we didn't have full URL so we need to
1016         // dig deeper
1017         if (empty($url['scheme'])) {
1018             // Scheme
1019             if (PMA_getenv('HTTP_SCHEME')) {
1020                 $url['scheme'] = PMA_getenv('HTTP_SCHEME');
1021             } else {
1022                 $url['scheme'] =
1023                     PMA_getenv('HTTPS') && strtolower(PMA_getenv('HTTPS')) != 'off'
1024                         ? 'https'
1025                         : 'http';
1026             }
1027         }
1028
1029         if (isset($url['scheme'])
1030           && $url['scheme'] == 'https') {
1031             $is_https = true;
1032         } else {
1033             $is_https = false;
1034         }
1035
1036         return $is_https;
1037     }
1038
1039     /**
1040      * detect correct cookie path
1041      */
1042     function checkCookiePath()
1043     {
1044         $this->set('cookie_path', $this->getCookiePath());
1045     }
1046
1047     /**
1048      * @static
1049      */
1050     public function getCookiePath()
1051     {
1052         static $cookie_path = null;
1053
1054         if (null !== $cookie_path) {
1055             return $cookie_path;
1056         }
1057
1058         $parsed_url = parse_url($this->get('PmaAbsoluteUri'));
1059
1060         $cookie_path   = $parsed_url['path'];
1061
1062         return $cookie_path;
1063     }
1064
1065     /**
1066      * enables backward compatibility
1067      */
1068     function enableBc()
1069     {
1070         $GLOBALS['cfg']             = $this->settings;
1071         $GLOBALS['default_server']  = $this->default_server;
1072         unset($this->default_server);
1073         $GLOBALS['collation_connection'] = $this->get('collation_connection');
1074         $GLOBALS['is_upload']       = $this->get('enable_upload');
1075         $GLOBALS['max_upload_size'] = $this->get('max_upload_size');
1076         $GLOBALS['cookie_path']     = $this->get('cookie_path');
1077         $GLOBALS['is_https']        = $this->get('is_https');
1078
1079         $defines = array(
1080             'PMA_VERSION',
1081             'PMA_THEME_VERSION',
1082             'PMA_THEME_GENERATION',
1083             'PMA_PHP_STR_VERSION',
1084             'PMA_PHP_INT_VERSION',
1085             'PMA_IS_WINDOWS',
1086             'PMA_IS_IIS',
1087             'PMA_IS_GD2',
1088             'PMA_USR_OS',
1089             'PMA_USR_BROWSER_VER',
1090             'PMA_USR_BROWSER_AGENT'
1091             );
1092
1093         foreach ($defines as $define) {
1094             if (! defined($define)) {
1095                 define($define, $this->get($define));
1096             }
1097         }
1098     }
1099
1100     /**
1101      * @todo finish
1102      */
1103     function save() {}
1104
1105     /**
1106      * returns options for font size selection
1107      *
1108      * @uses    preg_replace()
1109      * @uses    ksort()
1110      * @static
1111      * @param   string  $current_size   current selected font size with unit
1112      * @return  array   selectable font sizes
1113      */
1114     static protected function _getFontsizeOptions($current_size = '82%')
1115     {
1116         $unit = preg_replace('/[0-9.]*/', '', $current_size);
1117         $value = preg_replace('/[^0-9.]*/', '', $current_size);
1118
1119         $factors = array();
1120         $options = array();
1121         $options["$value"] = $value . $unit;
1122
1123         if ($unit === '%') {
1124             $factors[] = 1;
1125             $factors[] = 5;
1126             $factors[] = 10;
1127         } elseif ($unit === 'em') {
1128             $factors[] = 0.05;
1129             $factors[] = 0.2;
1130             $factors[] = 1;
1131         } elseif ($unit === 'pt') {
1132             $factors[] = 0.5;
1133             $factors[] = 2;
1134         } elseif ($unit === 'px') {
1135             $factors[] = 1;
1136             $factors[] = 5;
1137             $factors[] = 10;
1138         } else {
1139             //unknown font size unit
1140             $factors[] = 0.05;
1141             $factors[] = 0.2;
1142             $factors[] = 1;
1143             $factors[] = 5;
1144             $factors[] = 10;
1145         }
1146
1147         foreach ($factors as $key => $factor) {
1148             $option_inc = $value + $factor;
1149             $option_dec = $value - $factor;
1150             while (count($options) < 21) {
1151                 $options["$option_inc"] = $option_inc . $unit;
1152                 if ($option_dec > $factors[0]) {
1153                     $options["$option_dec"] = $option_dec . $unit;
1154                 }
1155                 $option_inc += $factor;
1156                 $option_dec -= $factor;
1157                 if (isset($factors[$key + 1])
1158                  && $option_inc >= $value + $factors[$key + 1]) {
1159                     break;
1160                 }
1161             }
1162         }
1163         ksort($options);
1164         return $options;
1165     }
1166
1167     /**
1168      * returns html selectbox for font sizes
1169      *
1170      * @uses    $GLOBALS['PMA_Config']
1171      * @uses    PMA_Config::get()
1172      * @uses    PMA_Config::_getFontsizeOptions()
1173      * @static
1174      * @param   string  $current_size   currently slected font size with unit
1175      * @return  string  html selectbox
1176      */
1177     static protected function _getFontsizeSelection()
1178     {
1179         $current_size = $GLOBALS['PMA_Config']->get('fontsize');
1180         // for the case when there is no config file (this is supported)
1181         if (empty($current_size)) {
1182             if (isset($_COOKIE['pma_fontsize'])) {
1183                 $current_size = $_COOKIE['pma_fontsize'];
1184             } else {
1185                 $current_size = '82%';
1186             }
1187         }
1188         $options = PMA_Config::_getFontsizeOptions($current_size);
1189
1190         $return = '<label for="select_fontsize">' . __('Font size') . ':</label>' . "\n";
1191         $return .= '<select name="set_fontsize" id="select_fontsize" onchange="this.form.submit();">' . "\n";
1192         foreach ($options as $option) {
1193             $return .= '<option value="' . $option . '"';
1194             if ($option == $current_size) {
1195                 $return .= ' selected="selected"';
1196             }
1197             $return .= '>' . $option . '</option>' . "\n";
1198         }
1199         $return .= '</select>';
1200
1201         return $return;
1202     }
1203
1204     /**
1205      * return complete font size selection form
1206      *
1207      * @uses    PMA_generate_common_hidden_inputs()
1208      * @uses    PMA_Config::_getFontsizeSelection()
1209      * @static
1210      * @param   string  $current_size   currently slected font size with unit
1211      * @return  string  html selectbox
1212      */
1213     static public function getFontsizeForm()
1214     {
1215         return '<form name="form_fontsize_selection" id="form_fontsize_selection"'
1216             . ' method="post" action="index.php" target="_parent">' . "\n"
1217             . PMA_generate_common_hidden_inputs() . "\n"
1218             . PMA_Config::_getFontsizeSelection() . "\n"
1219             . '<noscript>' . "\n"
1220             . '<input type="submit" value="' . __('Go') . '" />' . "\n"
1221             . '</noscript>' . "\n"
1222             . '</form>';
1223     }
1224
1225     /**
1226      * removes cookie
1227      *
1228      * @uses    PMA_Config::isHttps()
1229      * @uses    PMA_Config::getCookiePath()
1230      * @uses    setcookie()
1231      * @uses    time()
1232      * @param   string  $cookie     name of cookie to remove
1233      * @return  boolean result of setcookie()
1234      */
1235     function removeCookie($cookie)
1236     {
1237         return setcookie($cookie, '', time() - 3600,
1238             $this->getCookiePath(), '', $this->isHttps());
1239     }
1240
1241     /**
1242      * sets cookie if value is different from current cokkie value,
1243      * or removes if value is equal to default
1244      *
1245      * @uses    PMA_Config::isHttps()
1246      * @uses    PMA_Config::getCookiePath()
1247      * @uses    $_COOKIE
1248      * @uses    PMA_Config::removeCookie()
1249      * @uses    setcookie()
1250      * @uses    time()
1251      * @param   string  $cookie     name of cookie to remove
1252      * @param   mixed   $value      new cookie value
1253      * @param   string  $default    default value
1254      * @param   int     $validity   validity of cookie in seconds (default is one month)
1255      * @param   bool    $httponlt   whether cookie is only for HTTP (and not for scripts)
1256      * @return  boolean result of setcookie()
1257      */
1258     function setCookie($cookie, $value, $default = null, $validity = null, $httponly = true)
1259     {
1260         if ($validity == null) {
1261             $validity = 2592000;
1262         }
1263         if (strlen($value) && null !== $default && $value === $default) {
1264             // default value is used
1265             if (isset($_COOKIE[$cookie])) {
1266                 // remove cookie
1267                 return $this->removeCookie($cookie);
1268             }
1269             return false;
1270         }
1271
1272         if (! strlen($value) && isset($_COOKIE[$cookie])) {
1273             // remove cookie, value is empty
1274             return $this->removeCookie($cookie);
1275         }
1276
1277         if (! isset($_COOKIE[$cookie]) || $_COOKIE[$cookie] !== $value) {
1278             // set cookie with new value
1279             /* Calculate cookie validity */
1280             if ($validity == 0) {
1281                 $v = 0;
1282             } else {
1283                 $v = time() + $validity;
1284             }
1285             return setcookie($cookie, $value, $v,
1286                 $this->getCookiePath(), '', $this->isHttps(), $httponly);
1287         }
1288
1289         // cookie has already $value as value
1290         return true;
1291     }
1292 }
1293 ?>