/
Core.php
1415 lines (1271 loc) · 41.9 KB
/
Core.php
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<?php
/**
* Core functions used all over the scripts.
* This script is distinct from libraries/common.inc.php because this
* script is called from /test.
*/
declare(strict_types=1);
namespace PhpMyAdmin;
use PhpMyAdmin\Plugins\AuthenticationPlugin;
use Symfony\Component\DependencyInjection\ContainerInterface;
use const DATE_RFC1123;
use const E_USER_ERROR;
use const E_USER_WARNING;
use const FILTER_VALIDATE_IP;
use function array_keys;
use function array_pop;
use function array_walk_recursive;
use function chr;
use function count;
use function date_default_timezone_get;
use function date_default_timezone_set;
use function defined;
use function explode;
use function extension_loaded;
use function filter_var;
use function function_exists;
use function getenv;
use function gettype;
use function gmdate;
use function hash_equals;
use function hash_hmac;
use function header;
use function htmlspecialchars;
use function http_build_query;
use function implode;
use function in_array;
use function ini_get;
use function ini_set;
use function intval;
use function is_array;
use function is_numeric;
use function is_scalar;
use function is_string;
use function json_encode;
use function mb_internal_encoding;
use function mb_strlen;
use function mb_strpos;
use function mb_strrpos;
use function mb_substr;
use function parse_str;
use function parse_url;
use function preg_match;
use function preg_replace;
use function session_id;
use function session_write_close;
use function sprintf;
use function str_replace;
use function strlen;
use function strpos;
use function strtolower;
use function strtr;
use function substr;
use function trigger_error;
use function unserialize;
use function urldecode;
use function vsprintf;
/**
* Core class
*/
class Core
{
/**
* checks given $var and returns it if valid, or $default of not valid
* given $var is also checked for type being 'similar' as $default
* or against any other type if $type is provided
*
* <code>
* // $_REQUEST['db'] not set
* echo Core::ifSetOr($_REQUEST['db'], ''); // ''
* // $_POST['sql_query'] not set
* echo Core::ifSetOr($_POST['sql_query']); // null
* // $cfg['EnableFoo'] not set
* echo Core::ifSetOr($cfg['EnableFoo'], false, 'boolean'); // false
* echo Core::ifSetOr($cfg['EnableFoo']); // null
* // $cfg['EnableFoo'] set to 1
* echo Core::ifSetOr($cfg['EnableFoo'], false, 'boolean'); // false
* echo Core::ifSetOr($cfg['EnableFoo'], false, 'similar'); // 1
* echo Core::ifSetOr($cfg['EnableFoo'], false); // 1
* // $cfg['EnableFoo'] set to true
* echo Core::ifSetOr($cfg['EnableFoo'], false, 'boolean'); // true
* </code>
*
* @see self::isValid()
*
* @param mixed $var param to check
* @param mixed $default default value
* @param mixed $type var type or array of values to check against $var
*
* @return mixed $var or $default
*/
public static function ifSetOr(&$var, $default = null, $type = 'similar')
{
if (! self::isValid($var, $type, $default)) {
return $default;
}
return $var;
}
/**
* checks given $var against $type or $compare
*
* $type can be:
* - false : no type checking
* - 'scalar' : whether type of $var is integer, float, string or boolean
* - 'numeric' : whether type of $var is any number representation
* - 'length' : whether type of $var is scalar with a string length > 0
* - 'similar' : whether type of $var is similar to type of $compare
* - 'equal' : whether type of $var is identical to type of $compare
* - 'identical' : whether $var is identical to $compare, not only the type!
* - or any other valid PHP variable type
*
* <code>
* // $_REQUEST['doit'] = true;
* Core::isValid($_REQUEST['doit'], 'identical', 'true'); // false
* // $_REQUEST['doit'] = 'true';
* Core::isValid($_REQUEST['doit'], 'identical', 'true'); // true
* </code>
*
* NOTE: call-by-reference is used to not get NOTICE on undefined vars,
* but the var is not altered inside this function, also after checking a var
* this var exists nut is not set, example:
* <code>
* // $var is not set
* isset($var); // false
* functionCallByReference($var); // false
* isset($var); // true
* functionCallByReference($var); // true
* </code>
*
* to avoid this we set this var to null if not isset
*
* @see https://secure.php.net/gettype
*
* @param mixed $var variable to check
* @param mixed $type var type or array of valid values to check against $var
* @param mixed $compare var to compare with $var
*
* @return bool whether valid or not
*
* @todo add some more var types like hex, bin, ...?
*/
public static function isValid(&$var, $type = 'length', $compare = null): bool
{
if (! isset($var)) {
// var is not even set
return false;
}
if ($type === false) {
// no vartype requested
return true;
}
if (is_array($type)) {
return in_array($var, $type);
}
// allow some aliases of var types
$type = strtolower($type);
switch ($type) {
case 'identic':
$type = 'identical';
break;
case 'len':
$type = 'length';
break;
case 'bool':
$type = 'boolean';
break;
case 'float':
$type = 'double';
break;
case 'int':
$type = 'integer';
break;
case 'null':
$type = 'NULL';
break;
}
if ($type === 'identical') {
return $var === $compare;
}
// whether we should check against given $compare
if ($type === 'similar') {
switch (gettype($compare)) {
case 'string':
case 'boolean':
$type = 'scalar';
break;
case 'integer':
case 'double':
$type = 'numeric';
break;
default:
$type = gettype($compare);
}
} elseif ($type === 'equal') {
$type = gettype($compare);
}
// do the check
if ($type === 'length' || $type === 'scalar') {
$is_scalar = is_scalar($var);
if ($is_scalar && $type === 'length') {
return strlen((string) $var) > 0;
}
return $is_scalar;
}
if ($type === 'numeric') {
return is_numeric($var);
}
return gettype($var) === $type;
}
/**
* Removes insecure parts in a path; used before include() or
* require() when a part of the path comes from an insecure source
* like a cookie or form.
*
* @param string $path The path to check
*/
public static function securePath(string $path): string
{
// change .. to .
return (string) preg_replace('@\.\.*@', '.', $path);
}
/**
* displays the given error message on phpMyAdmin error page in foreign language,
* ends script execution and closes session
*
* loads language file if not loaded already
*
* @param string $error_message the error message or named error message
* @param string|array $message_args arguments applied to $error_message
*/
public static function fatalError(
string $error_message,
$message_args = null
): void {
global $dbi;
/* Use format string if applicable */
if (is_string($message_args)) {
$error_message = sprintf($error_message, $message_args);
} elseif (is_array($message_args)) {
$error_message = vsprintf($error_message, $message_args);
}
/*
* Avoid using Response class as config does not have to be loaded yet
* (this can happen on early fatal error)
*/
if (isset($dbi, $GLOBALS['PMA_Config']) && $dbi !== null
&& $GLOBALS['PMA_Config']->get('is_setup') === false
&& Response::getInstance()->isAjax()
) {
$response = Response::getInstance();
$response->setRequestStatus(false);
$response->addJSON('message', Message::error($error_message));
} elseif (! empty($_REQUEST['ajax_request'])) {
// Generate JSON manually
self::headerJSON();
echo json_encode(
[
'success' => false,
'message' => Message::error($error_message)->getDisplay(),
]
);
} else {
$error_message = strtr($error_message, ['<br>' => '[br]']);
$template = new Template();
echo $template->render('error/generic', [
'lang' => $GLOBALS['lang'] ?? 'en',
'dir' => $GLOBALS['text_dir'] ?? 'ltr',
'error_message' => Sanitize::sanitizeMessage($error_message),
]);
}
if (! defined('TESTSUITE')) {
exit;
}
}
/**
* Returns a link to the PHP documentation
*
* @param string $target anchor in documentation
*
* @return string the URL
*
* @access public
*/
public static function getPHPDocLink(string $target): string
{
/* List of PHP documentation translations */
$php_doc_languages = [
'pt_BR',
'zh',
'fr',
'de',
'it',
'ja',
'pl',
'ro',
'ru',
'fa',
'es',
'tr',
];
$lang = 'en';
if (isset($GLOBALS['lang']) && in_array($GLOBALS['lang'], $php_doc_languages)) {
$lang = $GLOBALS['lang'];
}
return self::linkURL('https://secure.php.net/manual/' . $lang . '/' . $target);
}
/**
* Warn or fail on missing extension.
*
* @param string $extension Extension name
* @param bool $fatal Whether the error is fatal.
* @param string $extra Extra string to append to message.
*/
public static function warnMissingExtension(
string $extension,
bool $fatal = false,
string $extra = ''
): void {
/** @var ErrorHandler $error_handler */
global $error_handler;
/* Gettext does not have to be loaded yet here */
if (function_exists('__')) {
$message = __(
'The %s extension is missing. Please check your PHP configuration.'
);
} else {
$message
= 'The %s extension is missing. Please check your PHP configuration.';
}
$doclink = self::getPHPDocLink('book.' . $extension . '.php');
$message = sprintf(
$message,
'[a@' . $doclink . '@Documentation][em]' . $extension . '[/em][/a]'
);
if ($extra != '') {
$message .= ' ' . $extra;
}
if ($fatal) {
self::fatalError($message);
return;
}
$error_handler->addError(
$message,
E_USER_WARNING,
'',
0,
false
);
}
/**
* returns count of tables in given db
*
* @param string $db database to count tables for
*
* @return int count of tables in $db
*/
public static function getTableCount(string $db): int
{
global $dbi;
$tables = $dbi->tryQuery(
'SHOW TABLES FROM ' . Util::backquote($db) . ';',
DatabaseInterface::CONNECT_USER,
DatabaseInterface::QUERY_STORE
);
if ($tables) {
$num_tables = $dbi->numRows($tables);
$dbi->freeResult($tables);
} else {
$num_tables = 0;
}
return $num_tables;
}
/**
* Converts numbers like 10M into bytes
* Used with permission from Moodle (https://moodle.org) by Martin Dougiamas
* (renamed with PMA prefix to avoid double definition when embedded
* in Moodle)
*
* @param string|int $size size (Default = 0)
*/
public static function getRealSize($size = 0): int
{
if (! $size) {
return 0;
}
$binaryprefixes = [
'T' => 1099511627776,
't' => 1099511627776,
'G' => 1073741824,
'g' => 1073741824,
'M' => 1048576,
'm' => 1048576,
'K' => 1024,
'k' => 1024,
];
if (preg_match('/^([0-9]+)([KMGT])/i', (string) $size, $matches)) {
return (int) ($matches[1] * $binaryprefixes[$matches[2]]);
}
return (int) $size;
}
/**
* Checks given $page against given $allowList and returns true if valid
* it optionally ignores query parameters in $page (script.php?ignored)
*
* @param string $page page to check
* @param array $allowList allow list to check page against
* @param bool $include whether the page is going to be included
*
* @return bool whether $page is valid or not (in $allowList or not)
*/
public static function checkPageValidity(&$page, array $allowList = [], $include = false): bool
{
if (empty($allowList)) {
$allowList = ['index.php'];
}
if (empty($page)) {
return false;
}
if (in_array($page, $allowList)) {
return true;
}
if ($include) {
return false;
}
$_page = mb_substr(
$page,
0,
(int) mb_strpos($page . '?', '?')
);
if (in_array($_page, $allowList)) {
return true;
}
$_page = urldecode($page);
$_page = mb_substr(
$_page,
0,
(int) mb_strpos($_page . '?', '?')
);
return in_array($_page, $allowList);
}
/**
* tries to find the value for the given environment variable name
*
* searches in $_SERVER, $_ENV then tries getenv() and apache_getenv()
* in this order
*
* @param string $var_name variable name
*
* @return string value of $var or empty string
*/
public static function getenv(string $var_name): string
{
if (isset($_SERVER[$var_name])) {
return (string) $_SERVER[$var_name];
}
if (isset($_ENV[$var_name])) {
return (string) $_ENV[$var_name];
}
if (getenv($var_name)) {
return (string) getenv($var_name);
}
if (function_exists('apache_getenv')
&& apache_getenv($var_name, true)
) {
return (string) apache_getenv($var_name, true);
}
return '';
}
/**
* Send HTTP header, taking IIS limits into account (600 seems ok)
*
* @param string $uri the header to send
* @param bool $use_refresh whether to use Refresh: header when running on IIS
*/
public static function sendHeaderLocation(string $uri, bool $use_refresh = false): void
{
if ($GLOBALS['PMA_Config']->get('PMA_IS_IIS') && mb_strlen($uri) > 600) {
Response::getInstance()->disable();
$template = new Template();
echo $template->render('header_location', ['uri' => $uri]);
return;
}
/*
* Avoid relative path redirect problems in case user entered URL
* like /phpmyadmin/index.php/ which some web servers happily accept.
*/
if ($uri[0] === '.') {
$uri = $GLOBALS['PMA_Config']->getRootPath() . substr($uri, 2);
}
$response = Response::getInstance();
session_write_close();
if ($response->headersSent()) {
trigger_error(
'Core::sendHeaderLocation called when headers are already sent!',
E_USER_ERROR
);
}
// bug #1523784: IE6 does not like 'Refresh: 0', it
// results in a blank page
// but we need it when coming from the cookie login panel)
if ($GLOBALS['PMA_Config']->get('PMA_IS_IIS') && $use_refresh) {
$response->header('Refresh: 0; ' . $uri);
} else {
$response->header('Location: ' . $uri);
}
}
/**
* Outputs application/json headers. This includes no caching.
*/
public static function headerJSON(): void
{
if (defined('TESTSUITE')) {
return;
}
// No caching
self::noCacheHeader();
// MIME type
header('Content-Type: application/json; charset=UTF-8');
// Disable content sniffing in browser
// This is needed in case we include HTML in JSON, browser might assume it's
// html to display
header('X-Content-Type-Options: nosniff');
}
/**
* Outputs headers to prevent caching in browser (and on the way).
*/
public static function noCacheHeader(): void
{
if (defined('TESTSUITE')) {
return;
}
// rfc2616 - Section 14.21
header('Expires: ' . gmdate(DATE_RFC1123));
// HTTP/1.1
header(
'Cache-Control: no-store, no-cache, must-revalidate,'
. ' pre-check=0, post-check=0, max-age=0'
);
header('Pragma: no-cache'); // HTTP/1.0
// test case: exporting a database into a .gz file with Safari
// would produce files not having the current time
// (added this header for Safari but should not harm other browsers)
header('Last-Modified: ' . gmdate(DATE_RFC1123));
}
/**
* Sends header indicating file download.
*
* @param string $filename Filename to include in headers if empty,
* none Content-Disposition header will be sent.
* @param string $mimetype MIME type to include in headers.
* @param int $length Length of content (optional)
* @param bool $no_cache Whether to include no-caching headers.
*/
public static function downloadHeader(
string $filename,
string $mimetype,
int $length = 0,
bool $no_cache = true
): void {
if ($no_cache) {
self::noCacheHeader();
}
/* Replace all possibly dangerous chars in filename */
$filename = Sanitize::sanitizeFilename($filename);
if (! empty($filename)) {
header('Content-Description: File Transfer');
header('Content-Disposition: attachment; filename="' . $filename . '"');
}
header('Content-Type: ' . $mimetype);
// inform the server that compression has been done,
// to avoid a double compression (for example with Apache + mod_deflate)
$notChromeOrLessThan43 = PMA_USR_BROWSER_AGENT != 'CHROME' // see bug #4942
|| (PMA_USR_BROWSER_AGENT == 'CHROME' && PMA_USR_BROWSER_VER < 43);
if (strpos($mimetype, 'gzip') !== false && $notChromeOrLessThan43) {
header('Content-Encoding: gzip');
}
header('Content-Transfer-Encoding: binary');
if ($length <= 0) {
return;
}
header('Content-Length: ' . $length);
}
/**
* Returns value of an element in $array given by $path.
* $path is a string describing position of an element in an associative array,
* eg. Servers/1/host refers to $array[Servers][1][host]
*
* @param string $path path in the array
* @param array $array the array
* @param mixed $default default value
*
* @return array|mixed|null array element or $default
*/
public static function arrayRead(string $path, array $array, $default = null)
{
$keys = explode('/', $path);
$value =& $array;
foreach ($keys as $key) {
if (! isset($value[$key])) {
return $default;
}
$value =& $value[$key];
}
return $value;
}
/**
* Stores value in an array
*
* @param string $path path in the array
* @param array $array the array
* @param mixed $value value to store
*/
public static function arrayWrite(string $path, array &$array, $value): void
{
$keys = explode('/', $path);
$last_key = array_pop($keys);
$a =& $array;
foreach ($keys as $key) {
if (! isset($a[$key])) {
$a[$key] = [];
}
$a =& $a[$key];
}
$a[$last_key] = $value;
}
/**
* Removes value from an array
*
* @param string $path path in the array
* @param array $array the array
*/
public static function arrayRemove(string $path, array &$array): void
{
$keys = explode('/', $path);
$keys_last = array_pop($keys);
$path = [];
$depth = 0;
$path[0] =& $array;
$found = true;
// go as deep as required or possible
foreach ($keys as $key) {
if (! isset($path[$depth][$key])) {
$found = false;
break;
}
$depth++;
$path[$depth] =& $path[$depth - 1][$key];
}
// if element found, remove it
if ($found) {
unset($path[$depth][$keys_last]);
$depth--;
}
// remove empty nested arrays
for (; $depth >= 0; $depth--) {
if (isset($path[$depth + 1]) && count($path[$depth + 1]) !== 0) {
break;
}
unset($path[$depth][$keys[$depth]]);
}
}
/**
* Returns link to (possibly) external site using defined redirector.
*
* @param string $url URL where to go.
*
* @return string URL for a link.
*/
public static function linkURL(string $url): string
{
if (! preg_match('#^https?://#', $url)) {
return $url;
}
$params = [];
$params['url'] = $url;
$url = Url::getCommon($params);
//strip off token and such sensitive information. Just keep url.
$arr = parse_url($url);
if (! is_array($arr)) {
$arr = [];
}
parse_str($arr['query'] ?? '', $vars);
$query = http_build_query(['url' => $vars['url']]);
if ($GLOBALS['PMA_Config'] !== null && $GLOBALS['PMA_Config']->get('is_setup')) {
$url = '../url.php?' . $query;
} else {
$url = './url.php?' . $query;
}
return $url;
}
/**
* Checks whether domain of URL is an allowed domain or not.
* Use only for URLs of external sites.
*
* @param string $url URL of external site.
*
* @return bool True: if domain of $url is allowed domain,
* False: otherwise.
*/
public static function isAllowedDomain(string $url): bool
{
$arr = parse_url($url);
if (! is_array($arr)) {
$arr = [];
}
// We need host to be set
if (! isset($arr['host']) || strlen($arr['host']) == 0) {
return false;
}
// We do not want these to be present
$blocked = [
'user',
'pass',
'port',
];
foreach ($blocked as $part) {
if (isset($arr[$part]) && strlen((string) $arr[$part]) != 0) {
return false;
}
}
$domain = $arr['host'];
$domainAllowList = [
/* Include current domain */
$_SERVER['SERVER_NAME'],
/* phpMyAdmin domains */
'wiki.phpmyadmin.net',
'www.phpmyadmin.net',
'phpmyadmin.net',
'demo.phpmyadmin.net',
'docs.phpmyadmin.net',
/* mysql.com domains */
'dev.mysql.com',
'bugs.mysql.com',
/* mariadb domains */
'mariadb.org',
'mariadb.com',
/* php.net domains */
'php.net',
'secure.php.net',
/* Github domains*/
'github.com',
'www.github.com',
/* Percona domains */
'www.percona.com',
/* Following are doubtful ones. */
'mysqldatabaseadministration.blogspot.com',
];
return in_array($domain, $domainAllowList);
}
/**
* Replace some html-unfriendly stuff
*
* @param string $buffer String to process
*
* @return string Escaped and cleaned up text suitable for html
*/
public static function mimeDefaultFunction(string $buffer): string
{
$buffer = htmlspecialchars($buffer);
$buffer = str_replace(' ', ' ', $buffer);
return (string) preg_replace("@((\015\012)|(\015)|(\012))@", '<br>' . "\n", $buffer);
}
/**
* Displays SQL query before executing.
*
* @param array|string $query_data Array containing queries or query itself
*/
public static function previewSQL($query_data): void
{
$retval = '<div class="preview_sql">';
if (empty($query_data)) {
$retval .= __('No change');
} elseif (is_array($query_data)) {
foreach ($query_data as $query) {
$retval .= Html\Generator::formatSql($query);
}
} else {
$retval .= Html\Generator::formatSql($query_data);
}
$retval .= '</div>';
$response = Response::getInstance();
$response->addJSON('sql_data', $retval);
}
/**
* recursively check if variable is empty
*
* @param mixed $value the variable
*
* @return bool true if empty
*/
public static function emptyRecursive($value): bool
{
$empty = true;
if (is_array($value)) {
array_walk_recursive(
$value,
/**
* @param mixed $item
*/
static function ($item) use (&$empty) {
$empty = $empty && empty($item);
}
);
} else {
$empty = empty($value);
}
return $empty;
}
/**
* Creates some globals from $_POST variables matching a pattern
*
* @param array $post_patterns The patterns to search for
*/
public static function setPostAsGlobal(array $post_patterns): void
{
global $containerBuilder;
foreach (array_keys($_POST) as $post_key) {
foreach ($post_patterns as $one_post_pattern) {
if (! preg_match($one_post_pattern, $post_key)) {
continue;
}
$GLOBALS[$post_key] = $_POST[$post_key];
$containerBuilder->setParameter($post_key, $GLOBALS[$post_key]);
}
}
}
public static function setDatabaseAndTableFromRequest(ContainerInterface $containerBuilder): void
{
global $db, $table, $url_params;
$databaseFromRequest = $_POST['db'] ?? $_GET['db'] ?? $_REQUEST['db'] ?? null;
$tableFromRequest = $_POST['table'] ?? $_GET['table'] ?? $_REQUEST['table'] ?? null;
$db = self::isValid($databaseFromRequest) ? $databaseFromRequest : '';
$table = self::isValid($tableFromRequest) ? $tableFromRequest : '';
$url_params['db'] = $db;
$url_params['table'] = $table;
$containerBuilder->setParameter('db', $db);
$containerBuilder->setParameter('table', $table);
$containerBuilder->setParameter('url_params', $url_params);
}
/**
* PATH_INFO could be compromised if set, so remove it from PHP_SELF
* and provide a clean PHP_SELF here
*/
public static function cleanupPathInfo(): void
{
global $PMA_PHP_SELF;
$PMA_PHP_SELF = self::getenv('PHP_SELF');
if (empty($PMA_PHP_SELF)) {
$PMA_PHP_SELF = urldecode(self::getenv('REQUEST_URI'));
}
$_PATH_INFO = self::getenv('PATH_INFO');
if (! empty($_PATH_INFO) && ! empty($PMA_PHP_SELF)) {
$question_pos = mb_strpos($PMA_PHP_SELF, '?');
if ($question_pos != false) {
$PMA_PHP_SELF = mb_substr($PMA_PHP_SELF, 0, $question_pos);
}
$path_info_pos = mb_strrpos($PMA_PHP_SELF, $_PATH_INFO);
if ($path_info_pos !== false) {
$path_info_part = mb_substr($PMA_PHP_SELF, $path_info_pos, mb_strlen($_PATH_INFO));
if ($path_info_part == $_PATH_INFO) {
$PMA_PHP_SELF = mb_substr($PMA_PHP_SELF, 0, $path_info_pos);
}
}
}
$path = [];
foreach (explode('/', $PMA_PHP_SELF) as $part) {
// ignore parts that have no value
if (empty($part) || $part === '.') {
continue;
}
if ($part !== '..') {
// cool, we found a new part
$path[] = $part;
} elseif (count($path) > 0) {
// going back up? sure
array_pop($path);
}
// Here we intentionall ignore case where we go too up
// as there is nothing sane to do
}
$PMA_PHP_SELF = htmlspecialchars('/' . implode('/', $path));
}
/**
* Checks that required PHP extensions are there.
*/
public static function checkExtensions(): void
{
/**
* Warning about mbstring.
*/
if (! function_exists('mb_detect_encoding')) {
self::warnMissingExtension('mbstring');
}
/**
* We really need this one!
*/
if (! function_exists('preg_replace')) {
self::warnMissingExtension('pcre', true);
}