setup/lib/index.lib.php

   1 <?php
   2 /* vim: set expandtab sw=4 ts=4 sts=4: */
   3 /**
   4  * Various checks and message functions used on index page.
   5  *
   6  * Security checks are the idea of Aung Khant <aungkhant[at]yehg.net>, http://yehg.net/lab
   7  * Version check taken from the old setup script by Michal Čihař <michal@cihar.com>
   8  *
   9  * @package phpMyAdmin-setup
  10  */
  11
  12 if (!defined('PHPMYADMIN')) {
  13     exit;
  14 }
  15
  16 /**
  17  * Initializes message list
  18  */
  19 function messages_begin()
  20 {
  21     if (!isset($_SESSION['messages']) || !is_array($_SESSION['messages'])) {
  22         $_SESSION['messages'] = array('error' => array(), 'notice' => array());
  23     } else {
  24         // reset message states
  25         foreach ($_SESSION['messages'] as &$messages) {
  26             foreach ($messages as &$msg) {
  27                 $msg['fresh'] = false;
  28                 $msg['active'] = false;
  29             }
  30         }
  31     }
  32 }
  33
  34 /**
  35  * Adds a new message to message list
  36  *
  37  * @param string $id unique message identifier
  38  * @param string $type one of: notice, error
  39  * @param string $title language string id (in $str array)
  40  * @param string $message message text
  41  */
  42 function messages_set($type, $id, $title, $message)
  43 {
  44     $fresh = !isset($_SESSION['messages'][$type][$id]);
  45     $_SESSION['messages'][$type][$id] = array(
  46         'fresh' => $fresh,
  47         'active' => true,
  48         'title' => $title,
  49         'message' => $message);
  50 }
  51
  52 /**
  53  * Cleans up message list
  54  */
  55 function messages_end()
  56 {
  57     foreach ($_SESSION['messages'] as &$messages) {
  58         $remove_ids = array();
  59         foreach ($messages as $id => &$msg) {
  60             if ($msg['active'] == false) {
  61                 $remove_ids[] = $id;
  62             }
  63         }
  64         foreach ($remove_ids as $id) {
  65             unset($messages[$id]);
  66         }
  67     }
  68 }
  69
  70 /**
  71  * Prints message list, must be called after messages_end()
  72  */
  73 function messages_show_html()
  74 {
  75     $old_ids = array();
  76     foreach ($_SESSION['messages'] as $type => $messages) {
  77         foreach ($messages as $id => $msg) {
  78             echo '<div class="' . $type . '" id="' . $id . '">' . '<h4>' . $msg['title'] . '</h4>' . $msg['message'] . '</div>';
  79             if (!$msg['fresh'] && $type != 'error') {
  80                 $old_ids[] = $id;
  81             }
  82         }
  83     }
  84
  85     echo "\n" . '<script type="text/javascript">';
  86     foreach ($old_ids as $id) {
  87         echo "\nhiddenMessages.push('$id');";
  88     }
  89     echo "\n</script>\n";
  90 }
  91
  92 /**
  93  * Checks for newest phpMyAdmin version and sets result as a new notice
  94  */
  95 function PMA_version_check()
  96 {
  97     // version check messages should always be visible so let's make
  98     // a unique message id each time we run it
  99     $message_id = uniqid('version_check');
 100     // wait 3s at most for server response, it's enough to get information
 101     // from a working server
 102     $connection_timeout = 3;
 103
 104     $url = 'http://phpmyadmin.net/home_page/version.php';
 105     $context = stream_context_create(array(
 106         'http' => array(
 107             'timeout' => $connection_timeout)));
 108     $data = @file_get_contents($url, null, $context);
 109     if ($data === false) {
 110         if (function_exists('curl_init')) {
 111             $ch = curl_init($url);
 112             curl_setopt($ch, CURLOPT_HEADER, false);
 113             curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
 114             curl_setopt($ch, CURLOPT_TIMEOUT, $connection_timeout);
 115             $data = curl_exec($ch);
 116             curl_close($ch);
 117         } else {
 118             messages_set('error', $message_id, __('Version check'),
 119                 __('Neither URL wrapper nor CURL is available. Version check is not possible.'));
 120             return;
 121         }
 122     }
 123
 124     if (empty($data)) {
 125         messages_set('error', $message_id, __('Version check'),
 126             __('Reading of version failed. Maybe you\'re offline or the upgrade server does not respond.'));
 127         return;
 128     }
 129
 130     /* Format: version\ndate\n(download\n)* */
 131     $data_list = explode("\n", $data);
 132
 133     if (count($data_list) > 1) {
 134         $version = $data_list[0];
 135         $date = $data_list[1];
 136     } else {
 137         $version = $date = '';
 138     }
 139
 140     $version_upstream = version_to_int($version);
 141     if ($version_upstream === false) {
 142         messages_set('error', $message_id, __('Version check'),
 143             __('Got invalid version string from server'));
 144         return;
 145     }
 146
 147     $version_local = version_to_int($GLOBALS['PMA_Config']->get('PMA_VERSION'));
 148     if ($version_local === false) {
 149         messages_set('error', $message_id, __('Version check'),
 150             __('Unparsable version string'));
 151         return;
 152     }
 153
 154     if ($version_upstream > $version_local) {
 155         $version = htmlspecialchars($version);
 156         $date = htmlspecialchars($date);
 157         messages_set('notice', $message_id, __('Version check'),
 158             sprintf(__('A newer version of phpMyAdmin is available and you should consider upgrading. The newest version is %s, released on %s.'), $version, $date));
 159     } else {
 160         if ($version_local % 100 == 0) {
 161             messages_set('notice', $message_id, __('Version check'),
 162                 PMA_sanitize(sprintf(__('You are using Git version, run [kbd]git pull[/kbd] :-)[br]The latest stable version is %s, released on %s.'), $version, $date)));
 163         } else {
 164             messages_set('notice', $message_id, __('Version check'),
 165                 __('No newer stable version is available'));
 166         }
 167     }
 168 }
 169
 170 /**
 171  * Calculates numerical equivalent of phpMyAdmin version string
 172  *
 173  * @param string  version
 174  * @return mixed  false on failure, integer on success
 175  */
 176 function version_to_int($version)
 177 {
 178     $matches = array();
 179     if (!preg_match('/^(\d+)\.(\d+)\.(\d+)((\.|-(pl|rc|dev|beta|alpha))(\d+)?(-dev)?)?$/', $version, $matches)) {
 180         return false;
 181     }
 182     if (!empty($matches[6])) {
 183         switch ($matches[6]) {
 184             case 'pl':
 185                 $added = 60;
 186                 break;
 187             case 'rc':
 188                 $added = 30;
 189                 break;
 190             case 'beta':
 191                 $added = 20;
 192                 break;
 193             case 'alpha':
 194                 $added = 10;
 195                 break;
 196             case 'dev':
 197                 $added = 0;
 198                 break;
 199             default:
 200                 messages_set('notice', 'version_match', __('Version check'),
 201                     'Unknown version part: ' . htmlspecialchars($matches[6]));
 202                 $added = 0;
 203                 break;
 204         }
 205     } else {
 206         $added = 50; // for final
 207     }
 208     if (!empty($matches[7])) {
 209         $added = $added + $matches[7];
 210     }
 211     return $matches[1] * 1000000 + $matches[2] * 10000 + $matches[3] * 100 + $added;
 212 }
 213
 214 /**
 215  * Checks whether config file is readable/writable
 216  *
 217  * @param bool &$is_readable
 218  * @param bool &$is_writable
 219  * @param bool &$file_exists
 220  */
 221 function check_config_rw(&$is_readable, &$is_writable, &$file_exists)
 222 {
 223     $file_path = ConfigFile::getInstance()->getFilePath();
 224     $file_dir = dirname($file_path);
 225     $is_readable = true;
 226     $is_writable = is_dir($file_dir);
 227     if (SETUP_DIR_WRITABLE) {
 228         $is_writable = $is_writable && is_writable($file_dir);
 229     }
 230     $file_exists = file_exists($file_path);
 231     if ($file_exists) {
 232         $is_readable = is_readable($file_path);
 233         $is_writable = $is_writable && is_writable($file_path);
 234     }
 235 }
 236
 237 /**
 238  * Performs various compatibility, security and consistency checks on current config
 239  *
 240  * Outputs results to message list, must be called between messages_begin()
 241  * and messages_end()
 242  */
 243 function perform_config_checks()
 244 {
 245     $cf = ConfigFile::getInstance();
 246     $blowfish_secret = $cf->get('blowfish_secret');
 247     $blowfish_secret_set = false;
 248     $cookie_auth_used = false;
 249
 250     $strAllowArbitraryServerWarning = __('This %soption%s should be disabled as it allows attackers to bruteforce login to any MySQL server. If you feel this is necessary, use %strusted proxies list%s. However, IP-based protection may not be reliable if your IP belongs to an ISP where thousands of users, including you, are connected to.');
 251     $strAllowArbitraryServerWarning = sprintf($strAllowArbitraryServerWarning, '[a@?page=form&amp;formset=Features#tab_Security]', '[/a]', '[a@?page=form&amp;formset=Features#tab_Security]', '[/a]');
 252     $strBlowfishSecretMsg = __('You didn\'t have blowfish secret set and have enabled cookie authentication, so a key was automatically generated for you. It is used to encrypt cookies; you don\'t need to remember it.');
 253     $strBZipDumpWarning = __('%sBzip2 compression and decompression%s requires functions (%s) which are unavailable on this system.');
 254     $strBZipDumpWarning = sprintf($strBZipDumpWarning, '[a@?page=form&amp;formset=Features#tab_Import_export]', '[/a]', '%s');
 255     $strDirectoryNotice = __('This value should be double checked to ensure that this directory is neither world accessible nor readable or writable by other users on your server.');
 256     $strForceSSLNotice = __('This %soption%s should be enabled if your web server supports it.');
 257     $strForceSSLNotice = sprintf($strForceSSLNotice, '[a@?page=form&amp;formset=Features#tab_Security]', '[/a]');
 258     $strGZipDumpWarning = __('%sGZip compression and decompression%s requires functions (%s) which are unavailable on this system.');
 259     $strGZipDumpWarning = sprintf($strGZipDumpWarning, '[a@?page=form&amp;formset=Features#tab_Import_export]', '[/a]', '%s');
 260     $strLoginCookieValidityWarning = __('%sLogin cookie validity%s greater than 1440 seconds may cause random session invalidation if %ssession.gc_maxlifetime%s is lower than its value (currently %d).');
 261     $strLoginCookieValidityWarning = sprintf($strLoginCookieValidityWarning, '[a@?page=form&amp;formset=Features#tab_Security]', '[/a]', '[a@' . PMA_getPHPDocLink('session.configuration.php#ini.session.gc-maxlifetime') . ']', '[/a]', ini_get('session.gc_maxlifetime'));
 262     $strLoginCookieValidityWarning2 = __('%sLogin cookie validity%s should be set to 1800 seconds (30 minutes) at most. Values larger than 1800 may pose a security risk such as impersonation.');
 263     $strLoginCookieValidityWarning2 = sprintf($strLoginCookieValidityWarning2, '[a@?page=form&amp;formset=Features#tab_Security]', '[/a]');
 264     $strLoginCookieValidityWarning3 = __('If using cookie authentication and %sLogin cookie store%s is not 0, %sLogin cookie validity%s must be set to a value less or equal to it.');
 265     $strLoginCookieValidityWarning3 = sprintf($strLoginCookieValidityWarning3, '[a@?page=form&amp;formset=Features#tab_Security]', '[/a]', '[a@?page=form&amp;formset=Features#tab_Security]', '[/a]');
 266     $strSecurityInfoMsg = __('If you feel this is necessary, use additional protection settings - %shost authentication%s settings and %strusted proxies list%s. However, IP-based protection may not be reliable if your IP belongs to an ISP where thousands of users, including you, are connected to.');
 267     $strSecurityInfoMsg = sprintf($strSecurityInfoMsg, '[a@?page=servers&amp;mode=edit&amp;id=%1$d#tab_Server_config]', '[/a]', '[a@?page=form&amp;formset=Features#tab_Security]', '%s');
 268     $strServerAuthConfigMsg = __('You set the [kbd]config[/kbd] authentication type and included username and password for auto-login, which is not a desirable option for live hosts. Anyone who knows or guesses your phpMyAdmin URL can directly access your phpMyAdmin panel. Set %sauthentication type%s to [kbd]cookie[/kbd] or [kbd]http[/kbd].');
 269     $strServerAuthConfigMsg = sprintf($strServerAuthConfigMsg, '[a@?page=servers&amp;mode=edit&amp;id=%1$d#tab_Server]', '[/a]');
 270     $strZipDumpExportWarning = __('%sZip compression%s requires functions (%s) which are unavailable on this system.');
 271     $strZipDumpExportWarning = sprintf($strZipDumpExportWarning, '[a@?page=form&amp;formset=Features#tab_Import_export]', '[/a]', '%s');
 272     $strZipDumpImportWarning = __('%sZip decompression%s requires functions (%s) which are unavailable on this system.');
 273     $strZipDumpImportWarning = sprintf($strZipDumpImportWarning, '[a@?page=form&amp;formset=Features#tab_Import_export]', '[/a]', '%s');
 274
 275     for ($i = 1, $server_cnt = $cf->getServerCount(); $i <= $server_cnt; $i++) {
 276         $cookie_auth_server = ($cf->getValue("Servers/$i/auth_type") == 'cookie');
 277         $cookie_auth_used |= $cookie_auth_server;
 278         $server_name = $cf->getServerName($i);
 279         if ($server_name == 'localhost') {
 280             $server_name .=  " [$i]";
 281         }
 282
 283         if ($cookie_auth_server && $blowfish_secret === null) {
 284             $blowfish_secret = uniqid('', true);
 285             $blowfish_secret_set = true;
 286             $cf->set('blowfish_secret', $blowfish_secret);
 287         }
 288
 289         //
 290         // $cfg['Servers'][$i]['ssl']
 291         // should be enabled if possible
 292         //
 293         if (!$cf->getValue("Servers/$i/ssl")) {
 294             $title = PMA_lang(PMA_lang_name('Servers/1/ssl')) . " ($server_name)";
 295             messages_set('notice', "Servers/$i/ssl", $title,
 296                 __('You should use SSL connections if your web server supports it.'));
 297         }
 298
 299         //
 300         // $cfg['Servers'][$i]['extension']
 301         // warn about using 'mysql'
 302         //
 303         if ($cf->getValue("Servers/$i/extension") == 'mysql') {
 304             $title = PMA_lang(PMA_lang_name('Servers/1/extension')) . " ($server_name)";
 305             messages_set('notice', "Servers/$i/extension", $title,
 306                 __('You should use mysqli for performance reasons.'));
 307         }
 308
 309         //
 310         // $cfg['Servers'][$i]['auth_type']
 311         // warn about full user credentials if 'auth_type' is 'config'
 312         //
 313         if ($cf->getValue("Servers/$i/auth_type") == 'config'
 314                 && $cf->getValue("Servers/$i/user") != ''
 315                 && $cf->getValue("Servers/$i/password") != '') {
 316             $title = PMA_lang(PMA_lang_name('Servers/1/auth_type')) . " ($server_name)";
 317             messages_set('notice', "Servers/$i/auth_type", $title,
 318                     PMA_lang($strServerAuthConfigMsg, $i) . ' ' .
 319                             PMA_lang($strSecurityInfoMsg, $i));
 320         }
 321
 322         //
 323         // $cfg['Servers'][$i]['AllowRoot']
 324         // $cfg['Servers'][$i]['AllowNoPassword']
 325         // serious security flaw
 326         //
 327         if ($cf->getValue("Servers/$i/AllowRoot")
 328                 && $cf->getValue("Servers/$i/AllowNoPassword")) {
 329             $title = PMA_lang(PMA_lang_name('Servers/1/AllowNoPassword')) . " ($server_name)";
 330             messages_set('notice', "Servers/$i/AllowNoPassword", $title,
 331                     __('You allow for connecting to the server without a password.') . ' ' .
 332                             PMA_lang($strSecurityInfoMsg, $i));
 333         }
 334     }
 335
 336     //
 337     // $cfg['blowfish_secret']
 338     // it's required for 'cookie' authentication
 339     //
 340     if ($cookie_auth_used) {
 341         if ($blowfish_secret_set) {
 342             // 'cookie' auth used, blowfish_secret was generated
 343             messages_set('notice', 'blowfish_secret_created',
 344                 PMA_lang(PMA_lang_name('blowfish_secret')),
 345                 $strBlowfishSecretMsg);
 346         } else {
 347             $blowfish_warnings = array();
 348             // check length
 349             if (strlen($blowfish_secret) < 8) {
 350                 // too short key
 351                 $blowfish_warnings[] = __('Key is too short, it should have at least 8 characters.');
 352             }
 353             // check used characters
 354             $has_digits = (bool) preg_match('/\d/', $blowfish_secret);
 355             $has_chars = (bool) preg_match('/\S/', $blowfish_secret);
 356             $has_nonword = (bool) preg_match('/\W/', $blowfish_secret);
 357             if (!$has_digits || !$has_chars || !$has_nonword) {
 358                 $blowfish_warnings[] = PMA_lang(__('Key should contain letters, numbers [em]and[/em] special characters.'));
 359             }
 360             if (!empty($blowfish_warnings)) {
 361                 messages_set('error', 'blowfish_warnings' . count($blowfish_warnings),
 362                     PMA_lang(PMA_lang_name('blowfish_secret')),
 363                     implode('<br />', $blowfish_warnings));
 364             }
 365         }
 366     }
 367
 368     //
 369     // $cfg['ForceSSL']
 370     // should be enabled if possible
 371     //
 372     if (!$cf->getValue('ForceSSL')) {
 373         messages_set('notice', 'ForceSSL',
 374             PMA_lang(PMA_lang_name('ForceSSL')),
 375             PMA_lang($strForceSSLNotice));
 376     }
 377
 378     //
 379     // $cfg['AllowArbitraryServer']
 380     // should be disabled
 381     //
 382     if ($cf->getValue('AllowArbitraryServer')) {
 383         messages_set('notice', 'AllowArbitraryServer',
 384             PMA_lang(PMA_lang_name('AllowArbitraryServer')),
 385             PMA_lang($strAllowArbitraryServerWarning));
 386     }
 387
 388     //
 389     // $cfg['LoginCookieValidity']
 390     // value greater than session.gc_maxlifetime will cause random session invalidation after that time
 391     //
 392     if ($cf->getValue('LoginCookieValidity') > 1440
 393             || $cf->getValue('LoginCookieValidity') > ini_get('session.gc_maxlifetime')) {
 394         $message_type = $cf->getValue('LoginCookieValidity') > ini_get('session.gc_maxlifetime')
 395             ? 'error'
 396             : 'notice';
 397         messages_set($message_type, 'LoginCookieValidity',
 398             PMA_lang(PMA_lang_name('LoginCookieValidity')),
 399             PMA_lang($strLoginCookieValidityWarning));
 400     }
 401
 402     //
 403     // $cfg['LoginCookieValidity']
 404     // should be at most 1800 (30 min)
 405     //
 406     if ($cf->getValue('LoginCookieValidity') > 1800) {
 407         messages_set('notice', 'LoginCookieValidity',
 408             PMA_lang(PMA_lang_name('LoginCookieValidity')),
 409             PMA_lang($strLoginCookieValidityWarning2));
 410     }
 411
 412     //
 413     // $cfg['LoginCookieValidity']
 414     // $cfg['LoginCookieStore']
 415     // LoginCookieValidity must be less or equal to LoginCookieStore
 416     //
 417     if ($cf->getValue('LoginCookieStore') != 0 && $cf->getValue('LoginCookieValidity') > $cf->getValue('LoginCookieStore')) {
 418        messages_set('error', 'LoginCookieValidity',
 419             PMA_lang(PMA_lang_name('LoginCookieValidity')),
 420             PMA_lang($strLoginCookieValidityWarning3));
 421     }
 422
 423     //
 424     // $cfg['SaveDir']
 425     // should not be world-accessible
 426     //
 427     if ($cf->getValue('SaveDir') != '') {
 428         messages_set('notice', 'SaveDir',
 429             PMA_lang(PMA_lang_name('SaveDir')),
 430             PMA_lang($strDirectoryNotice));
 431     }
 432
 433     //
 434     // $cfg['TempDir']
 435     // should not be world-accessible
 436     //
 437     if ($cf->getValue('TempDir') != '') {
 438         messages_set('notice', 'TempDir',
 439             PMA_lang(PMA_lang_name('TempDir')),
 440             PMA_lang($strDirectoryNotice));
 441     }
 442
 443     //
 444     // $cfg['GZipDump']
 445     // requires zlib functions
 446     //
 447     if ($cf->getValue('GZipDump')
 448             && (@!function_exists('gzopen') || @!function_exists('gzencode'))) {
 449         messages_set('error', 'GZipDump',
 450             PMA_lang(PMA_lang_name('GZipDump')),
 451             PMA_lang($strGZipDumpWarning, 'gzencode'));
 452     }
 453
 454     //
 455     // $cfg['BZipDump']
 456     // requires bzip2 functions
 457     //
 458     if ($cf->getValue('BZipDump')
 459             && (!@function_exists('bzopen') || !@function_exists('bzcompress'))) {
 460         $functions = @function_exists('bzopen')
 461                 ? '' :
 462                 'bzopen';
 463         $functions .= @function_exists('bzcompress')
 464                 ? ''
 465                 : ($functions ? ', ' : '') . 'bzcompress';
 466         messages_set('error', 'BZipDump',
 467             PMA_lang(PMA_lang_name('BZipDump')),
 468             PMA_lang($strBZipDumpWarning, $functions));
 469     }
 470
 471     //
 472     // $cfg['ZipDump']
 473     // requires zip_open in import
 474     //
 475     if ($cf->getValue('ZipDump') && !@function_exists('zip_open')) {
 476         messages_set('error', 'ZipDump_import',
 477             PMA_lang(PMA_lang_name('ZipDump')),
 478             PMA_lang($strZipDumpImportWarning, 'zip_open'));
 479     }
 480
 481     //
 482     // $cfg['ZipDump']
 483     // requires gzcompress in export
 484     //
 485     if ($cf->getValue('ZipDump') && !@function_exists('gzcompress')) {
 486         messages_set('error', 'ZipDump_export',
 487             PMA_lang(PMA_lang_name('ZipDump')),
 488             PMA_lang($strZipDumpExportWarning, 'gzcompress'));
 489     }
 490 }
 491 ?>