<?php /** * Deal with importing all those nasty globals and things * * Copyright © 2003 Brion Vibber <brion@pobox.com> * https://www.mediawiki.org/ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * http://www.gnu.org/copyleft/gpl.html * * @file */ /** * The WebRequest class encapsulates getting at data passed in the * URL or via a POSTed form stripping illegal input characters and * normalizing Unicode sequences. * * Usually this is used via a global singleton, $wgRequest. You should * not create a second WebRequest object; make a FauxRequest object if * you want to pass arbitrary data to some function in place of the web * input. * * @ingroup HTTP */ class WebRequest { protected $data, $headers = array(); /** * Flag to make WebRequest::getHeader return an array of values. * @since 1.26 */ const GETHEADER_LIST = 1; /** * Lazy-init response object * @var WebResponse */ private $response; /** * Cached client IP address * @var string */ private $ip; /** * The timestamp of the start of the request, with microsecond precision. * @var float */ protected $requestTime; /** * Cached URL protocol * @var string */ protected $protocol; public function __construct() { $this->requestTime = isset( $_SERVER['REQUEST_TIME_FLOAT'] ) ? $_SERVER['REQUEST_TIME_FLOAT'] : microtime( true ); // POST overrides GET data // We don't use $_REQUEST here to avoid interference from cookies... $this->data = $_POST + $_GET; } /** * Extract relevant query arguments from the http request uri's path * to be merged with the normal php provided query arguments. * Tries to use the REQUEST_URI data if available and parses it * according to the wiki's configuration looking for any known pattern. * * If the REQUEST_URI is not provided we'll fall back on the PATH_INFO * provided by the server if any and use that to set a 'title' parameter. * * @param string $want If this is not 'all', then the function * will return an empty array if it determines that the URL is * inside a rewrite path. * * @return array Any query arguments found in path matches. */ public static function getPathInfo( $want = 'all' ) { global $wgUsePathInfo; // PATH_INFO is mangled due to http://bugs.php.net/bug.php?id=31892 // And also by Apache 2.x, double slashes are converted to single slashes. // So we will use REQUEST_URI if possible. $matches = array(); if ( !empty( $_SERVER['REQUEST_URI'] ) ) { // Slurp out the path portion to examine... $url = $_SERVER['REQUEST_URI']; if ( !preg_match( '!^https?://!', $url ) ) { $url = 'http://unused' . $url; } MediaWiki\suppressWarnings(); $a = parse_url( $url ); MediaWiki\restoreWarnings(); if ( $a ) { $path = isset( $a['path'] ) ? $a['path'] : ''; global $wgScript; if ( $path == $wgScript && $want !== 'all' ) { // Script inside a rewrite path? // Abort to keep from breaking... return $matches; } $router = new PathRouter; // Raw PATH_INFO style $router->add( "$wgScript/$1" ); if ( isset( $_SERVER['SCRIPT_NAME'] ) && preg_match( '/\.php5?/', $_SERVER['SCRIPT_NAME'] ) ) { # Check for SCRIPT_NAME, we handle index.php explicitly # But we do have some other .php files such as img_auth.php # Don't let root article paths clober the parsing for them $router->add( $_SERVER['SCRIPT_NAME'] . "/$1" ); } global $wgArticlePath; if ( $wgArticlePath ) { $router->add( $wgArticlePath ); } global $wgActionPaths; if ( $wgActionPaths ) { $router->add( $wgActionPaths, array( 'action' => '$key' ) ); } global $wgVariantArticlePath, $wgContLang; if ( $wgVariantArticlePath ) { $router->add( $wgVariantArticlePath, array( 'variant' => '$2' ), array( '$2' => $wgContLang->getVariants() ) ); } Hooks::run( 'WebRequestPathInfoRouter', array( $router ) ); $matches = $router->parse( $path ); } } elseif ( $wgUsePathInfo ) { if ( isset( $_SERVER['ORIG_PATH_INFO'] ) && $_SERVER['ORIG_PATH_INFO'] != '' ) { // Mangled PATH_INFO // http://bugs.php.net/bug.php?id=31892 // Also reported when ini_get('cgi.fix_pathinfo')==false $matches['title'] = substr( $_SERVER['ORIG_PATH_INFO'], 1 ); } elseif ( isset( $_SERVER['PATH_INFO'] ) && $_SERVER['PATH_INFO'] != '' ) { // Regular old PATH_INFO yay $matches['title'] = substr( $_SERVER['PATH_INFO'], 1 ); } } return $matches; } /** * Work out an appropriate URL prefix containing scheme and host, based on * information detected from $_SERVER * * @return string */ public static function detectServer() { global $wgAssumeProxiesUseDefaultProtocolPorts; $proto = self::detectProtocol(); $stdPort = $proto === 'https' ? 443 : 80; $varNames = array( 'HTTP_HOST', 'SERVER_NAME', 'HOSTNAME', 'SERVER_ADDR' ); $host = 'localhost'; $port = $stdPort; foreach ( $varNames as $varName ) { if ( !isset( $_SERVER[$varName] ) ) { continue; } $parts = IP::splitHostAndPort( $_SERVER[$varName] ); if ( !$parts ) { // Invalid, do not use continue; } $host = $parts[0]; if ( $wgAssumeProxiesUseDefaultProtocolPorts && isset( $_SERVER['HTTP_X_FORWARDED_PROTO'] ) ) { // Bug 70021: Assume that upstream proxy is running on the default // port based on the protocol. We have no reliable way to determine // the actual port in use upstream. $port = $stdPort; } elseif ( $parts[1] === false ) { if ( isset( $_SERVER['SERVER_PORT'] ) ) { $port = $_SERVER['SERVER_PORT']; } // else leave it as $stdPort } else { $port = $parts[1]; } break; } return $proto . '://' . IP::combineHostAndPort( $host, $port, $stdPort ); } /** * Detect the protocol from $_SERVER. * This is for use prior to Setup.php, when no WebRequest object is available. * At other times, use the non-static function getProtocol(). * * @return array */ public static function detectProtocol() { if ( ( !empty( $_SERVER['HTTPS'] ) && $_SERVER['HTTPS'] !== 'off' ) || ( isset( $_SERVER['HTTP_X_FORWARDED_PROTO'] ) && $_SERVER['HTTP_X_FORWARDED_PROTO'] === 'https' ) ) { return 'https'; } else { return 'http'; } } /** * Get the number of seconds to have elapsed since request start, * in fractional seconds, with microsecond resolution. * * @return float * @since 1.25 */ public function getElapsedTime() { return microtime( true ) - $this->requestTime; } /** * Get the current URL protocol (http or https) * @return string */ public function getProtocol() { if ( $this->protocol === null ) { $this->protocol = self::detectProtocol(); } return $this->protocol; } /** * Check for title, action, and/or variant data in the URL * and interpolate it into the GET variables. * This should only be run after $wgContLang is available, * as we may need the list of language variants to determine * available variant URLs. */ public function interpolateTitle() { // bug 16019: title interpolation on API queries is useless and sometimes harmful if ( defined( 'MW_API' ) ) { return; } $matches = self::getPathInfo( 'title' ); foreach ( $matches as $key => $val ) { $this->data[$key] = $_GET[$key] = $_REQUEST[$key] = $val; } } /** * URL rewriting function; tries to extract page title and, * optionally, one other fixed parameter value from a URL path. * * @param string $path The URL path given from the client * @param array $bases One or more URLs, optionally with $1 at the end * @param string $key If provided, the matching key in $bases will be * passed on as the value of this URL parameter * @return array Array of URL variables to interpolate; empty if no match */ static function extractTitle( $path, $bases, $key = false ) { foreach ( (array)$bases as $keyValue => $base ) { // Find the part after $wgArticlePath $base = str_replace( '$1', '', $base ); $baseLen = strlen( $base ); if ( substr( $path, 0, $baseLen ) == $base ) { $raw = substr( $path, $baseLen ); if ( $raw !== '' ) { $matches = array( 'title' => rawurldecode( $raw ) ); if ( $key ) { $matches[$key] = $keyValue; } return $matches; } } } return array(); } /** * Recursively normalizes UTF-8 strings in the given array. * * @param string|array $data * @return array|string Cleaned-up version of the given * @private */ function normalizeUnicode( $data ) { if ( is_array( $data ) ) { foreach ( $data as $key => $val ) { $data[$key] = $this->normalizeUnicode( $val ); } } else { global $wgContLang; $data = isset( $wgContLang ) ? $wgContLang->normalize( $data ) : UtfNormal\Validator::cleanUp( $data ); } return $data; } /** * Fetch a value from the given array or return $default if it's not set. * * @param array $arr * @param string $name * @param mixed $default * @return mixed */ private function getGPCVal( $arr, $name, $default ) { # PHP is so nice to not touch input data, except sometimes: # http://us2.php.net/variables.external#language.variables.external.dot-in-names # Work around PHP *feature* to avoid *bugs* elsewhere. $name = strtr( $name, '.', '_' ); if ( isset( $arr[$name] ) ) { global $wgContLang; $data = $arr[$name]; if ( isset( $_GET[$name] ) && !is_array( $data ) ) { # Check for alternate/legacy character encoding. if ( isset( $wgContLang ) ) { $data = $wgContLang->checkTitleEncoding( $data ); } } $data = $this->normalizeUnicode( $data ); return $data; } else { return $default; } } /** * Fetch a scalar from the input or return $default if it's not set. * Returns a string. Arrays are discarded. Useful for * non-freeform text inputs (e.g. predefined internal text keys * selected by a drop-down menu). For freeform input, see getText(). * * @param string $name * @param string $default Optional default (or null) * @return string */ public function getVal( $name, $default = null ) { $val = $this->getGPCVal( $this->data, $name, $default ); if ( is_array( $val ) ) { $val = $default; } if ( is_null( $val ) ) { return $val; } else { return (string)$val; } } /** * Set an arbitrary value into our get/post data. * * @param string $key Key name to use * @param mixed $value Value to set * @return mixed Old value if one was present, null otherwise */ public function setVal( $key, $value ) { $ret = isset( $this->data[$key] ) ? $this->data[$key] : null; $this->data[$key] = $value; return $ret; } /** * Unset an arbitrary value from our get/post data. * * @param string $key Key name to use * @return mixed Old value if one was present, null otherwise */ public function unsetVal( $key ) { if ( !isset( $this->data[$key] ) ) { $ret = null; } else { $ret = $this->data[$key]; unset( $this->data[$key] ); } return $ret; } /** * Fetch an array from the input or return $default if it's not set. * If source was scalar, will return an array with a single element. * If no source and no default, returns null. * * @param string $name * @param array $default Optional default (or null) * @return array */ public function getArray( $name, $default = null ) { $val = $this->getGPCVal( $this->data, $name, $default ); if ( is_null( $val ) ) { return null; } else { return (array)$val; } } /** * Fetch an array of integers, or return $default if it's not set. * If source was scalar, will return an array with a single element. * If no source and no default, returns null. * If an array is returned, contents are guaranteed to be integers. * * @param string $name * @param array $default Option default (or null) * @return array Array of ints */ public function getIntArray( $name, $default = null ) { $val = $this->getArray( $name, $default ); if ( is_array( $val ) ) { $val = array_map( 'intval', $val ); } return $val; } /** * Fetch an integer value from the input or return $default if not set. * Guaranteed to return an integer; non-numeric input will typically * return 0. * * @param string $name * @param int $default * @return int */ public function getInt( $name, $default = 0 ) { return intval( $this->getVal( $name, $default ) ); } /** * Fetch an integer value from the input or return null if empty. * Guaranteed to return an integer or null; non-numeric input will * typically return null. * * @param string $name * @return int|null */ public function getIntOrNull( $name ) { $val = $this->getVal( $name ); return is_numeric( $val ) ? intval( $val ) : null; } /** * Fetch a floating point value from the input or return $default if not set. * Guaranteed to return a float; non-numeric input will typically * return 0. * * @since 1.23 * @param string $name * @param float $default * @return float */ public function getFloat( $name, $default = 0.0 ) { return floatval( $this->getVal( $name, $default ) ); } /** * Fetch a boolean value from the input or return $default if not set. * Guaranteed to return true or false, with normal PHP semantics for * boolean interpretation of strings. * * @param string $name * @param bool $default * @return bool */ public function getBool( $name, $default = false ) { return (bool)$this->getVal( $name, $default ); } /** * Fetch a boolean value from the input or return $default if not set. * Unlike getBool, the string "false" will result in boolean false, which is * useful when interpreting information sent from JavaScript. * * @param string $name * @param bool $default * @return bool */ public function getFuzzyBool( $name, $default = false ) { return $this->getBool( $name, $default ) && strcasecmp( $this->getVal( $name ), 'false' ) !== 0; } /** * Return true if the named value is set in the input, whatever that * value is (even "0"). Return false if the named value is not set. * Example use is checking for the presence of check boxes in forms. * * @param string $name * @return bool */ public function getCheck( $name ) { # Checkboxes and buttons are only present when clicked # Presence connotes truth, absence false return $this->getVal( $name, null ) !== null; } /** * Fetch a text string from the given array or return $default if it's not * set. Carriage returns are stripped from the text, and with some language * modules there is an input transliteration applied. This should generally * be used for form "<textarea>" and "<input>" fields. Used for * user-supplied freeform text input (for which input transformations may * be required - e.g. Esperanto x-coding). * * @param string $name * @param string $default Optional * @return string */ public function getText( $name, $default = '' ) { global $wgContLang; $val = $this->getVal( $name, $default ); return str_replace( "\r\n", "\n", $wgContLang->recodeInput( $val ) ); } /** * Extracts the given named values into an array. * If no arguments are given, returns all input values. * No transformation is performed on the values. * * @return array */ public function getValues() { $names = func_get_args(); if ( count( $names ) == 0 ) { $names = array_keys( $this->data ); } $retVal = array(); foreach ( $names as $name ) { $value = $this->getGPCVal( $this->data, $name, null ); if ( !is_null( $value ) ) { $retVal[$name] = $value; } } return $retVal; } /** * Returns the names of all input values excluding those in $exclude. * * @param array $exclude * @return array */ public function getValueNames( $exclude = array() ) { return array_diff( array_keys( $this->getValues() ), $exclude ); } /** * Get the values passed in the query string. * No transformation is performed on the values. * * @return array */ public function getQueryValues() { return $_GET; } /** * Return the contents of the Query with no decoding. Use when you need to * know exactly what was sent, e.g. for an OAuth signature over the elements. * * @return string */ public function getRawQueryString() { return $_SERVER['QUERY_STRING']; } /** * Return the contents of the POST with no decoding. Use when you need to * know exactly what was sent, e.g. for an OAuth signature over the elements. * * @return string */ public function getRawPostString() { if ( !$this->wasPosted() ) { return ''; } return $this->getRawInput(); } /** * Return the raw request body, with no processing. Cached since some methods * disallow reading the stream more than once. As stated in the php docs, this * does not work with enctype="multipart/form-data". * * @return string */ public function getRawInput() { static $input = null; if ( $input === null ) { $input = file_get_contents( 'php://input' ); } return $input; } /** * Get the HTTP method used for this request. * * @return string */ public function getMethod() { return isset( $_SERVER['REQUEST_METHOD'] ) ? $_SERVER['REQUEST_METHOD'] : 'GET'; } /** * Returns true if the present request was reached by a POST operation, * false otherwise (GET, HEAD, or command-line). * * Note that values retrieved by the object may come from the * GET URL etc even on a POST request. * * @return bool */ public function wasPosted() { return $this->getMethod() == 'POST'; } /** * Returns true if there is a session cookie set. * This does not necessarily mean that the user is logged in! * * If you want to check for an open session, use session_id() * instead; that will also tell you if the session was opened * during the current request (in which case the cookie will * be sent back to the client at the end of the script run). * * @return bool */ public function checkSessionCookie() { return isset( $_COOKIE[session_name()] ); } /** * Get a cookie from the $_COOKIE jar * * @param string $key The name of the cookie * @param string $prefix A prefix to use for the cookie name, if not $wgCookiePrefix * @param mixed $default What to return if the value isn't found * @return mixed Cookie value or $default if the cookie not set */ public function getCookie( $key, $prefix = null, $default = null ) { if ( $prefix === null ) { global $wgCookiePrefix; $prefix = $wgCookiePrefix; } return $this->getGPCVal( $_COOKIE, $prefix . $key, $default ); } /** * Return the path and query string portion of the request URI. * This will be suitable for use as a relative link in HTML output. * * @throws MWException * @return string */ public function getRequestURL() { if ( isset( $_SERVER['REQUEST_URI'] ) && strlen( $_SERVER['REQUEST_URI'] ) ) { $base = $_SERVER['REQUEST_URI']; } elseif ( isset( $_SERVER['HTTP_X_ORIGINAL_URL'] ) && strlen( $_SERVER['HTTP_X_ORIGINAL_URL'] ) ) { // Probably IIS; doesn't set REQUEST_URI $base = $_SERVER['HTTP_X_ORIGINAL_URL']; } elseif ( isset( $_SERVER['SCRIPT_NAME'] ) ) { $base = $_SERVER['SCRIPT_NAME']; if ( isset( $_SERVER['QUERY_STRING'] ) && $_SERVER['QUERY_STRING'] != '' ) { $base .= '?' . $_SERVER['QUERY_STRING']; } } else { // This shouldn't happen! throw new MWException( "Web server doesn't provide either " . "REQUEST_URI, HTTP_X_ORIGINAL_URL or SCRIPT_NAME. Report details " . "of your web server configuration to https://phabricator.wikimedia.org/" ); } // User-agents should not send a fragment with the URI, but // if they do, and the web server passes it on to us, we // need to strip it or we get false-positive redirect loops // or weird output URLs $hash = strpos( $base, '#' ); if ( $hash !== false ) { $base = substr( $base, 0, $hash ); } if ( $base[0] == '/' ) { // More than one slash will look like it is protocol relative return preg_replace( '!^/+!', '/', $base ); } else { // We may get paths with a host prepended; strip it. return preg_replace( '!^[^:]+://[^/]+/+!', '/', $base ); } } /** * Return the request URI with the canonical service and hostname, path, * and query string. This will be suitable for use as an absolute link * in HTML or other output. * * If $wgServer is protocol-relative, this will return a fully * qualified URL with the protocol that was used for this request. * * @return string */ public function getFullRequestURL() { return wfExpandUrl( $this->getRequestURL(), PROTO_CURRENT ); } /** * Take an arbitrary query and rewrite the present URL to include it * @deprecated Use appendQueryValue/appendQueryArray instead * @param string $query Query string fragment; do not include initial '?' * @return string */ public function appendQuery( $query ) { wfDeprecated( __METHOD__, '1.25' ); return $this->appendQueryArray( wfCgiToArray( $query ) ); } /** * @param string $key * @param string $value * @param bool $onlyquery [deprecated] * @return string */ public function appendQueryValue( $key, $value, $onlyquery = true ) { return $this->appendQueryArray( array( $key => $value ), $onlyquery ); } /** * Appends or replaces value of query variables. * * @param array $array Array of values to replace/add to query * @param bool $onlyquery Whether to only return the query string and not the complete URL [deprecated] * @return string */ public function appendQueryArray( $array, $onlyquery = true ) { global $wgTitle; $newquery = $this->getQueryValues(); unset( $newquery['title'] ); $newquery = array_merge( $newquery, $array ); $query = wfArrayToCgi( $newquery ); if ( !$onlyquery ) { wfDeprecated( __METHOD__, '1.25' ); return $wgTitle->getLocalURL( $query ); } return $query; } /** * Check for limit and offset parameters on the input, and return sensible * defaults if not given. The limit must be positive and is capped at 5000. * Offset must be positive but is not capped. * * @param int $deflimit Limit to use if no input and the user hasn't set the option. * @param string $optionname To specify an option other than rclimit to pull from. * @return int[] First element is limit, second is offset */ public function getLimitOffset( $deflimit = 50, $optionname = 'rclimit' ) { global $wgUser; $limit = $this->getInt( 'limit', 0 ); if ( $limit < 0 ) { $limit = 0; } if ( ( $limit == 0 ) && ( $optionname != '' ) ) { $limit = $wgUser->getIntOption( $optionname ); } if ( $limit <= 0 ) { $limit = $deflimit; } if ( $limit > 5000 ) { $limit = 5000; # We have *some* limits... } $offset = $this->getInt( 'offset', 0 ); if ( $offset < 0 ) { $offset = 0; } return array( $limit, $offset ); } /** * Return the path to the temporary file where PHP has stored the upload. * * @param string $key * @return string|null String or null if no such file. */ public function getFileTempname( $key ) { $file = new WebRequestUpload( $this, $key ); return $file->getTempName(); } /** * Return the upload error or 0 * * @param string $key * @return int */ public function getUploadError( $key ) { $file = new WebRequestUpload( $this, $key ); return $file->getError(); } /** * Return the original filename of the uploaded file, as reported by * the submitting user agent. HTML-style character entities are * interpreted and normalized to Unicode normalization form C, in part * to deal with weird input from Safari with non-ASCII filenames. * * Other than this the name is not verified for being a safe filename. * * @param string $key * @return string|null String or null if no such file. */ public function getFileName( $key ) { $file = new WebRequestUpload( $this, $key ); return $file->getName(); } /** * Return a WebRequestUpload object corresponding to the key * * @param string $key * @return WebRequestUpload */ public function getUpload( $key ) { return new WebRequestUpload( $this, $key ); } /** * Return a handle to WebResponse style object, for setting cookies, * headers and other stuff, for Request being worked on. * * @return WebResponse */ public function response() { /* Lazy initialization of response object for this request */ if ( !is_object( $this->response ) ) { $class = ( $this instanceof FauxRequest ) ? 'FauxResponse' : 'WebResponse'; $this->response = new $class(); } return $this->response; } /** * Initialise the header list */ protected function initHeaders() { if ( count( $this->headers ) ) { return; } $apacheHeaders = function_exists( 'apache_request_headers' ) ? apache_request_headers() : false; if ( $apacheHeaders ) { foreach ( $apacheHeaders as $tempName => $tempValue ) { $this->headers[strtoupper( $tempName )] = $tempValue; } } else { foreach ( $_SERVER as $name => $value ) { if ( substr( $name, 0, 5 ) === 'HTTP_' ) { $name = str_replace( '_', '-', substr( $name, 5 ) ); $this->headers[$name] = $value; } elseif ( $name === 'CONTENT_LENGTH' ) { $this->headers['CONTENT-LENGTH'] = $value; } } } } /** * Get an array containing all request headers * * @return array Mapping header name to its value */ public function getAllHeaders() { $this->initHeaders(); return $this->headers; } /** * Get a request header, or false if it isn't set. * * @param string $name Case-insensitive header name * @param int $flags Bitwise combination of: * WebRequest::GETHEADER_LIST Treat the header as a comma-separated list * of values, as described in RFC 2616 § 4.2. * (since 1.26). * @return string|array|bool False if header is unset; otherwise the * header value(s) as either a string (the default) or an array, if * WebRequest::GETHEADER_LIST flag was set. */ public function getHeader( $name, $flags = 0 ) { $this->initHeaders(); $name = strtoupper( $name ); if ( !isset( $this->headers[$name] ) ) { return false; } $value = $this->headers[$name]; if ( $flags & self::GETHEADER_LIST ) { $value = array_map( 'trim', explode( ',', $value ) ); } return $value; } /** * Get data from $_SESSION * * @param string $key Name of key in $_SESSION * @return mixed */ public function getSessionData( $key ) { if ( !isset( $_SESSION[$key] ) ) { return null; } return $_SESSION[$key]; } /** * Set session data * * @param string $key Name of key in $_SESSION * @param mixed $data */ public function setSessionData( $key, $data ) { $_SESSION[$key] = $data; } /** * Check if Internet Explorer will detect an incorrect cache extension in * PATH_INFO or QUERY_STRING. If the request can't be allowed, show an error * message or redirect to a safer URL. Returns true if the URL is OK, and * false if an error message has been shown and the request should be aborted. * * @param array $extWhitelist * @throws HttpError * @return bool */ public function checkUrlExtension( $extWhitelist = array() ) { global $wgScriptExtension; $extWhitelist[] = ltrim( $wgScriptExtension, '.' ); if ( IEUrlExtension::areServerVarsBad( $_SERVER, $extWhitelist ) ) { if ( !$this->wasPosted() ) { $newUrl = IEUrlExtension::fixUrlForIE6( $this->getFullRequestURL(), $extWhitelist ); if ( $newUrl !== false ) { $this->doSecurityRedirect( $newUrl ); return false; } } throw new HttpError( 403, 'Invalid file extension found in the path info or query string.' ); } return true; } /** * Attempt to redirect to a URL with a QUERY_STRING that's not dangerous in * IE 6. Returns true if it was successful, false otherwise. * * @param string $url * @return bool */ protected function doSecurityRedirect( $url ) { header( 'Location: ' . $url ); header( 'Content-Type: text/html' ); $encUrl = htmlspecialchars( $url ); echo <<<HTML <html> <head> <title>Security redirect</title> </head> <body> <h1>Security redirect</h1> <p> We can't serve non-HTML content from the URL you have requested, because Internet Explorer would interpret it as an incorrect and potentially dangerous content type.</p> <p>Instead, please use <a href="$encUrl">this URL</a>, which is the same as the URL you have requested, except that "&*" is appended. This prevents Internet Explorer from seeing a bogus file extension. </p> </body> </html> HTML; echo "\n"; return true; } /** * Parse the Accept-Language header sent by the client into an array * * @return array Array( languageCode => q-value ) sorted by q-value in * descending order then appearing time in the header in ascending order. * May contain the "language" '*', which applies to languages other than those explicitly listed. * This is aligned with rfc2616 section 14.4 * Preference for earlier languages appears in rfc3282 as an extension to HTTP/1.1. */ public function getAcceptLang() { // Modified version of code found at // http://www.thefutureoftheweb.com/blog/use-accept-language-header $acceptLang = $this->getHeader( 'Accept-Language' ); if ( !$acceptLang ) { return array(); } // Return the language codes in lower case $acceptLang = strtolower( $acceptLang ); // Break up string into pieces (languages and q factors) $lang_parse = null; preg_match_all( '/([a-z]{1,8}(-[a-z]{1,8})*|\*)\s*(;\s*q\s*=\s*(1(\.0{0,3})?|0(\.[0-9]{0,3})?)?)?/', $acceptLang, $lang_parse ); if ( !count( $lang_parse[1] ) ) { return array(); } $langcodes = $lang_parse[1]; $qvalues = $lang_parse[4]; $indices = range( 0, count( $lang_parse[1] ) - 1 ); // Set default q factor to 1 foreach ( $indices as $index ) { if ( $qvalues[$index] === '' ) { $qvalues[$index] = 1; } elseif ( $qvalues[$index] == 0 ) { unset( $langcodes[$index], $qvalues[$index], $indices[$index] ); } } // Sort list. First by $qvalues, then by order. Reorder $langcodes the same way array_multisort( $qvalues, SORT_DESC, SORT_NUMERIC, $indices, $langcodes ); // Create a list like "en" => 0.8 $langs = array_combine( $langcodes, $qvalues ); return $langs; } /** * Fetch the raw IP from the request * * @since 1.19 * * @throws MWException * @return string */ protected function getRawIP() { if ( !isset( $_SERVER['REMOTE_ADDR'] ) ) { return null; } if ( is_array( $_SERVER['REMOTE_ADDR'] ) || strpos( $_SERVER['REMOTE_ADDR'], ',' ) !== false ) { throw new MWException( __METHOD__ . " : Could not determine the remote IP address due to multiple values." ); } else { $ipchain = $_SERVER['REMOTE_ADDR']; } return IP::canonicalize( $ipchain ); } /** * Work out the IP address based on various globals * For trusted proxies, use the XFF client IP (first of the chain) * * @since 1.19 * * @throws MWException * @return string */ public function getIP() { global $wgUsePrivateIPs; # Return cached result if ( $this->ip !== null ) { return $this->ip; } # collect the originating ips $ip = $this->getRawIP(); if ( !$ip ) { throw new MWException( 'Unable to determine IP.' ); } # Append XFF $forwardedFor = $this->getHeader( 'X-Forwarded-For' ); if ( $forwardedFor !== false ) { $isConfigured = IP::isConfiguredProxy( $ip ); $ipchain = array_map( 'trim', explode( ',', $forwardedFor ) ); $ipchain = array_reverse( $ipchain ); array_unshift( $ipchain, $ip ); # Step through XFF list and find the last address in the list which is a # trusted server. Set $ip to the IP address given by that trusted server, # unless the address is not sensible (e.g. private). However, prefer private # IP addresses over proxy servers controlled by this site (more sensible). # Note that some XFF values might be "unknown" with Squid/Varnish. foreach ( $ipchain as $i => $curIP ) { $curIP = IP::sanitizeIP( IP::canonicalize( $curIP ) ); if ( !$curIP || !isset( $ipchain[$i + 1] ) || $ipchain[$i + 1] === 'unknown' || !IP::isTrustedProxy( $curIP ) ) { break; // IP is not valid/trusted or does not point to anything } if ( IP::isPublic( $ipchain[$i + 1] ) || $wgUsePrivateIPs || IP::isConfiguredProxy( $curIP ) // bug 48919; treat IP as sane ) { // Follow the next IP according to the proxy $nextIP = IP::canonicalize( $ipchain[$i + 1] ); if ( !$nextIP && $isConfigured ) { // We have not yet made it past CDN/proxy servers of this site, // so either they are misconfigured or there is some IP spoofing. throw new MWException( "Invalid IP given in XFF '$forwardedFor'." ); } $ip = $nextIP; // keep traversing the chain continue; } break; } } # Allow extensions to improve our guess Hooks::run( 'GetIP', array( &$ip ) ); if ( !$ip ) { throw new MWException( "Unable to determine IP." ); } wfDebug( "IP: $ip\n" ); $this->ip = $ip; return $ip; } /** * @param string $ip * @return void * @since 1.21 */ public function setIP( $ip ) { $this->ip = $ip; } } /** * Object to access the $_FILES array */ class WebRequestUpload { protected $request; protected $doesExist; protected $fileInfo; /** * Constructor. Should only be called by WebRequest * * @param WebRequest $request The associated request * @param string $key Key in $_FILES array (name of form field) */ public function __construct( $request, $key ) { $this->request = $request; $this->doesExist = isset( $_FILES[$key] ); if ( $this->doesExist ) { $this->fileInfo = $_FILES[$key]; } } /** * Return whether a file with this name was uploaded. * * @return bool */ public function exists() { return $this->doesExist; } /** * Return the original filename of the uploaded file * * @return string|null Filename or null if non-existent */ public function getName() { if ( !$this->exists() ) { return null; } global $wgContLang; $name = $this->fileInfo['name']; # Safari sends filenames in HTML-encoded Unicode form D... # Horrid and evil! Let's try to make some kind of sense of it. $name = Sanitizer::decodeCharReferences( $name ); $name = $wgContLang->normalize( $name ); wfDebug( __METHOD__ . ": {$this->fileInfo['name']} normalized to '$name'\n" ); return $name; } /** * Return the file size of the uploaded file * * @return int File size or zero if non-existent */ public function getSize() { if ( !$this->exists() ) { return 0; } return $this->fileInfo['size']; } /** * Return the path to the temporary file * * @return string|null Path or null if non-existent */ public function getTempName() { if ( !$this->exists() ) { return null; } return $this->fileInfo['tmp_name']; } /** * Return the upload error. See link for explanation * http://www.php.net/manual/en/features.file-upload.errors.php * * @return int One of the UPLOAD_ constants, 0 if non-existent */ public function getError() { if ( !$this->exists() ) { return 0; # UPLOAD_ERR_OK } return $this->fileInfo['error']; } /** * Returns whether this upload failed because of overflow of a maximum set * in php.ini * * @return bool */ public function isIniSizeOverflow() { if ( $this->getError() == UPLOAD_ERR_INI_SIZE ) { # PHP indicated that upload_max_filesize is exceeded return true; } $contentLength = $this->request->getHeader( 'CONTENT_LENGTH' ); if ( $contentLength > wfShorthandToInteger( ini_get( 'post_max_size' ) ) ) { # post_max_size is exceeded return true; } return false; } } /** * WebRequest clone which takes values from a provided array. * * @ingroup HTTP */ class FauxRequest extends WebRequest { private $wasPosted = false; private $session = array(); private $requestUrl; protected $cookies = array(); /** * @param array $data Array of *non*-urlencoded key => value pairs, the * fake GET/POST values * @param bool $wasPosted Whether to treat the data as POST * @param array|null $session Session array or null * @param string $protocol 'http' or 'https' * @throws MWException */ public function __construct( $data = array(), $wasPosted = false, $session = null, $protocol = 'http' ) { $this->requestTime = microtime( true ); if ( is_array( $data ) ) { $this->data = $data; } else { throw new MWException( "FauxRequest() got bogus data" ); } $this->wasPosted = $wasPosted; if ( $session ) { $this->session = $session; } $this->protocol = $protocol; } /** * Initialise the header list */ protected function initHeaders() { // Nothing to init } /** * @param string $name * @param string $default * @return string */ public function getText( $name, $default = '' ) { # Override; don't recode since we're using internal data return (string)$this->getVal( $name, $default ); } /** * @return array */ public function getValues() { return $this->data; } /** * @return array */ public function getQueryValues() { if ( $this->wasPosted ) { return array(); } else { return $this->data; } } public function getMethod() { return $this->wasPosted ? 'POST' : 'GET'; } /** * @return bool */ public function wasPosted() { return $this->wasPosted; } public function getCookie( $key, $prefix = null, $default = null ) { if ( $prefix === null ) { global $wgCookiePrefix; $prefix = $wgCookiePrefix; } $name = $prefix . $key; return isset( $this->cookies[$name] ) ? $this->cookies[$name] : $default; } /** * @since 1.26 * @param string $name Unprefixed name of the cookie to set * @param string|null $value Value of the cookie to set * @param string|null $prefix Cookie prefix. Defaults to $wgCookiePrefix */ public function setCookie( $key, $value, $prefix = null ) { $this->setCookies( array( $key => $value ), $prefix ); } /** * @since 1.26 * @param array $cookies * @param string|null $prefix Cookie prefix. Defaults to $wgCookiePrefix */ public function setCookies( $cookies, $prefix = null ) { if ( $prefix === null ) { global $wgCookiePrefix; $prefix = $wgCookiePrefix; } foreach ( $cookies as $key => $value ) { $name = $prefix . $key; $this->cookies[$name] = $value; } } public function checkSessionCookie() { return false; } public function setRequestURL( $url ) { $this->requestUrl = $url; } public function getRequestURL() { if ( $this->requestUrl === null ) { throw new MWException( 'Request URL not set' ); } return $this->requestUrl; } public function getProtocol() { return $this->protocol; } /** * @param string $name * @param string $val */ public function setHeader( $name, $val ) { $this->setHeaders( array( $name => $val ) ); } /** * @since 1.26 * @param array $headers */ public function setHeaders( $headers ) { foreach ( $headers as $name => $val ) { $name = strtoupper( $name ); $this->headers[$name] = $val; } } /** * @param string $key * @return array|null */ public function getSessionData( $key ) { if ( isset( $this->session[$key] ) ) { return $this->session[$key]; } return null; } /** * @param string $key * @param array $data */ public function setSessionData( $key, $data ) { $this->session[$key] = $data; } /** * @return array|mixed|null */ public function getSessionArray() { return $this->session; } /** * FauxRequests shouldn't depend on raw request data (but that could be implemented here) * @return string */ public function getRawQueryString() { return ''; } /** * FauxRequests shouldn't depend on raw request data (but that could be implemented here) * @return string */ public function getRawPostString() { return ''; } /** * FauxRequests shouldn't depend on raw request data (but that could be implemented here) * @return string */ public function getRawInput() { return ''; } /** * @param array $extWhitelist * @return bool */ public function checkUrlExtension( $extWhitelist = array() ) { return true; } /** * @return string */ protected function getRawIP() { return '127.0.0.1'; } } /** * Similar to FauxRequest, but only fakes URL parameters and method * (POST or GET) and use the base request for the remaining stuff * (cookies, session and headers). * * @ingroup HTTP * @since 1.19 */ class DerivativeRequest extends FauxRequest { private $base; /** * @param WebRequest $base * @param array $data Array of *non*-urlencoded key => value pairs, the * fake GET/POST values * @param bool $wasPosted Whether to treat the data as POST */ public function __construct( WebRequest $base, $data, $wasPosted = false ) { $this->base = $base; parent::__construct( $data, $wasPosted ); } public function getCookie( $key, $prefix = null, $default = null ) { return $this->base->getCookie( $key, $prefix, $default ); } public function checkSessionCookie() { return $this->base->checkSessionCookie(); } public function getHeader( $name, $flags = 0 ) { return $this->base->getHeader( $name, $flags ); } public function getAllHeaders() { return $this->base->getAllHeaders(); } public function getSessionData( $key ) { return $this->base->getSessionData( $key ); } public function setSessionData( $key, $data ) { $this->base->setSessionData( $key, $data ); } public function getAcceptLang() { return $this->base->getAcceptLang(); } public function getIP() { return $this->base->getIP(); } public function getProtocol() { return $this->base->getProtocol(); } public function getElapsedTime() { return $this->base->getElapsedTime(); } }