-// Spam-uri pickup
-
-// Domain exposure callback (See spam_uri_pickup_preprocess())
-// http://victim.example.org/?foo+site:nasty.example.com+bar
-// => http://nasty.example.com/?refer=victim.example.org
-// NOTE: 'refer=' is not so good for (at this time).
-// Consider about using IP address of the victim, try to avoid that.
-function _preg_replace_callback_domain_exposure($matches = array())
-{
- $result = '';
-
- // Preserve the victim URI as a complicity or ...
- if (isset($matches[5])) {
- $result =
- $matches[1] . '://' . // scheme
- $matches[2] . '/' . // victim.example.org
- $matches[3]; // The rest of all (before victim)
- }
-
- // Flipped URI
- if (isset($matches[4])) {
- $result =
- $matches[1] . '://' . // scheme
- $matches[4] . // nasty.example.com
- '/?refer=' . strtolower($matches[2]) . // victim.example.org
- ' ' . $result;
- }
-
- return $result;
-}
-
-// Preprocess: rawurldecode() and adding space(s) and something
-// to detect/count some URIs _if possible_
-// NOTE: It's maybe danger to var_dump(result). [e.g. 'javascript:']
-// [OK] http://victim.example.org/?site:nasty.example.org
-// [OK] http://victim.example.org/nasty.example.org
-// [OK] http://victim.example.org/go?http%3A%2F%2Fnasty.example.org
-// [OK] http://victim.example.org/http://nasty.example.org
-function spam_uri_pickup_preprocess($string = '')
-{
- if (! is_string($string)) return '';
-
- $string = rawurldecode($string);
-
- // Domain exposure (simple)
- // http://victim.example.org/nasty.example.org/path#frag
- // => http://nasty.example.org/?refer=victim.example.org and original
- $string = preg_replace(
- '#h?ttp://' .
- '(' .
- 'ime\.nu' . '|' . // 2ch.net
- 'ime\.st' . '|' . // 2ch.net
- 'link\.toolbot\.com' . '|' .
- 'urlx\.org' .
- ')' .
- '/([a-z0-9.%_-]+\.[a-z0-9.%_-]+)#i', // nasty.example.org
- 'http://$2/?refer=$1 $0', // Preserve $0 or remove?
- $string
- );
-
- // Domain exposure (gate-big5)
- // http://victim.example.org/gate/big5/nasty.example.org/path
- // => http://nasty.example.org/?refer=victim.example.org and original
- $string = preg_replace(
- '#h?ttp://' .
- '(' .
- 'big5.51job.com' . '|' .
- 'big5.china.com' . '|' .
- 'big5.xinhuanet.com' . '|' .
- ')' .
- '/gate/big5' .
- '/([a-z0-9.%_-]+\.[a-z0-9.%_-]+)' .
- '#i', // nasty.example.org
- 'http://$2/?refer=$1 $0', // Preserve $0 or remove?
- $string
- );
-
- // Domain exposure (See _preg_replace_callback_domain_exposure())
- $string = preg_replace_callback(
- array(
- '#(http)://' .
- '(' .
- // Something Google: http://www.google.com/supported_domains
- '(?:[a-z0-9.]+\.)?google\.[a-z]{2,3}(?:\.[a-z]{2})?' .
- '|' .
- // AltaVista
- '(?:[a-z0-9.]+\.)?altavista.com' .
-
- ')' .
- '/' .
- '([a-z0-9?=&.%_/\'\\\+-]+)' . // path/?query=foo+bar+
- '\bsite:([a-z0-9.%_-]+\.[a-z0-9.%_-]+)' . // site:nasty.example.com
- //'()' . // Preserve or remove?
- '#i',
- ),
- '_preg_replace_callback_domain_exposure',
- $string
- );
-
- // URI exposure (uriuri => uri uri)
- $string = preg_replace(
- array(
- '#(?<! )(?:https?|ftp):/#i',
- // '#[a-z][a-z0-9.+-]{1,8}://#i',
- // '#[a-z][a-z0-9.+-]{1,8}://#i'
- ),
- ' $0',
- $string
- );
-
- return $string;
-}
-
-// Main function of spam-uri pickup,
-// A wrapper function of uri_pickup()
-function spam_uri_pickup($string = '', $method = array())
-{
- if (! is_array($method) || empty($method)) {
- $method = check_uri_spam_method();
- }
-
- $string = spam_uri_pickup_preprocess($string);
-
- $array = uri_pickup($string);
-
- // Area elevation of URIs, for '(especially external)link' intension
- if (! empty($array)) {
- $_method = array();
- if (isset($method['uri_anchor'])) $_method['uri_anchor'] = & $method['uri_anchor'];
- if (isset($method['uri_bbcode'])) $_method['uri_bbcode'] = & $method['uri_bbcode'];
- $areas = area_pickup($string, $_method, TRUE);
- if (! empty($areas)) {
- $area_shadow = array();
- foreach (array_keys($array) as $key) {
- $area_shadow[$key] = & $array[$key]['area'];
- foreach (array_keys($_method) as $_key) {
- $area_shadow[$key][$_key] = 0;
- }
- }
- foreach (array_keys($_method) as $_key) {
- if (isset($areas[$_key])) {
- area_measure($areas[$_key], $area_shadow, 1, $_key);
- }
- }
- }
- }
-
- // Remove 'offset's for area_measure()
- foreach(array_keys($array) as $key)
- unset($array[$key]['area']['offset']);
-
- return $array;
-}
-
-
-// ---------------------
-// Normalization
-
-// Scheme normalization: Renaming the schemes
-// snntp://example.org => nntps://example.org
-// NOTE: Keep the static lists simple. See also port_normalize().
-function scheme_normalize($scheme = '', $abbrevs_harmfull = TRUE)
-{
- // Abbreviations they have no intention of link
- static $abbrevs = array(
- 'ttp' => 'http',
- 'ttps' => 'https',
- );
-
- // Aliases => normalized ones
- static $aliases = array(
- 'pop' => 'pop3',
- 'news' => 'nntp',
- 'imap4' => 'imap',
- 'snntp' => 'nntps',
- 'snews' => 'nntps',
- 'spop3' => 'pop3s',
- 'pops' => 'pop3s',
- );
-
- if (! is_string($scheme)) return '';
-
- $scheme = strtolower($scheme);
- if (isset($abbrevs[$scheme])) {
- $scheme = $abbrevs_harmfull ? $abbrevs[$scheme] : '';
- }
- if (isset($aliases[$scheme])) {
- $scheme = $aliases[$scheme];
- }
-
- return $scheme;
-}
-
-// Hostname normlization (Destructive)
-// www.foo => www.foo ('foo' seems TLD)
-// www.foo.bar => foo.bar
-// www.10.20 => www.10.20 (Invalid hostname)
-// NOTE:
-// 'www' is mostly used as traditional hostname of WWW server.
-// 'www.foo.bar' may be identical with 'foo.bar'.
-function host_normalize($host = '')
-{
- if (! is_string($host)) return '';
-
- $host = strtolower($host);
- $matches = array();
- if (preg_match('/^www\.(.+\.[a-z]+)$/', $host, $matches)) {
- return $matches[1];
- } else {
- return $host;
- }
-}
-
-// Port normalization: Suppress the (redundant) default port
-// HTTP://example.org:80/ => http://example.org/
-// HTTP://example.org:8080/ => http://example.org:8080/
-// HTTPS://example.org:443/ => https://example.org/
-function port_normalize($port, $scheme, $scheme_normalize = FALSE)
-{
- // Schemes that users _maybe_ want to add protocol-handlers
- // to their web browsers. (and attackers _maybe_ want to use ...)
- // Reference: http://www.iana.org/assignments/port-numbers
- static $array = array(
- // scheme => default port
- 'ftp' => 21,
- 'ssh' => 22,
- 'telnet' => 23,
- 'smtp' => 25,
- 'tftp' => 69,
- 'gopher' => 70,
- 'finger' => 79,
- 'http' => 80,
- 'pop3' => 110,
- 'sftp' => 115,
- 'nntp' => 119,
- 'imap' => 143,
- 'irc' => 194,
- 'wais' => 210,
- 'https' => 443,
- 'nntps' => 563,
- 'rsync' => 873,
- 'ftps' => 990,
- 'telnets' => 992,
- 'imaps' => 993,
- 'ircs' => 994,
- 'pop3s' => 995,
- 'mysql' => 3306,
- );
-
- // intval() converts '0-1' to '0', so preg_match() rejects these invalid ones
- if (! is_numeric($port) || $port < 0 || preg_match('/[^0-9]/i', $port))
- return '';
-
- $port = intval($port);
- if ($scheme_normalize) $scheme = scheme_normalize($scheme);
- if (isset($array[$scheme]) && $port == $array[$scheme])
- $port = ''; // Ignore the defaults
-
- return $port;
-}
-
-// Path normalization
-// http://example.org => http://example.org/
-// http://example.org#hoge => http://example.org/#hoge
-// http://example.org/path/a/b/./c////./d => http://example.org/path/a/b/c/d
-// http://example.org/path/../../a/../back => http://example.org/back
-function path_normalize($path = '', $divider = '/', $add_root = TRUE)
-{
- if (! is_string($divider)) return is_string($path) ? $path : '';
-
- if ($add_root) {
- $first_div = & $divider;
- } else {
- $first_div = '';
- }
- if (! is_string($path) || $path == '') return $first_div;
-
- if (strpos($path, $divider, strlen($path) - strlen($divider)) === FALSE) {
- $last_div = '';
- } else {
- $last_div = & $divider;
- }
-
- $array = explode($divider, $path);
-
- // Remove paddings ('//' and '/./')
- foreach(array_keys($array) as $key) {
- if ($array[$key] == '' || $array[$key] == '.') {
- unset($array[$key]);
- }
- }
-
- // Remove back-tracks ('/../')
- $tmp = array();
- foreach($array as $value) {
- if ($value == '..') {
- array_pop($tmp);
- } else {
- array_push($tmp, $value);
- }
- }
- $array = & $tmp;
-
- if (empty($array)) {
- return $first_div;
- } else {
- return $first_div . implode($divider, $array) . $last_div;
- }
-}
-
-// DirectoryIndex normalize (Destructive and rough)
-// TODO: sample.en.ja.html.gz => sample.html
-function file_normalize($file = 'index.html.en')
-{
- static $simple_defaults = array(
- 'default.htm' => TRUE,
- 'default.html' => TRUE,
- 'default.asp' => TRUE,
- 'default.aspx' => TRUE,
- 'index' => TRUE, // Some system can omit the suffix
- );
-
- static $content_suffix = array(
- // index.xxx, sample.xxx
- 'htm' => TRUE,
- 'html' => TRUE,
- 'shtml' => TRUE,
- 'jsp' => TRUE,
- 'php' => TRUE,
- 'php3' => TRUE,
- 'php4' => TRUE,
- 'pl' => TRUE,
- 'py' => TRUE,
- 'rb' => TRUE,
- 'cgi' => TRUE,
- 'xml' => TRUE,
- );
-
- static $language_suffix = array(
- // Reference: Apache 2.0.59 'AddLanguage' default
- 'ca' => TRUE,
- 'cs' => TRUE, // cs
- 'cz' => TRUE, // cs
- 'de' => TRUE,
- 'dk' => TRUE, // da
- 'el' => TRUE,
- 'en' => TRUE,
- 'eo' => TRUE,
- 'es' => TRUE,
- 'et' => TRUE,
- 'fr' => TRUE,
- 'he' => TRUE,
- 'hr' => TRUE,
- 'it' => TRUE,
- 'ja' => TRUE,
- 'ko' => TRUE,
- 'ltz' => TRUE,
- 'nl' => TRUE,
- 'nn' => TRUE,
- 'no' => TRUE,
- 'po' => TRUE,
- 'pt' => TRUE,
- 'pt-br' => TRUE,
- 'ru' => TRUE,
- 'sv' => TRUE,
- 'zh-cn' => TRUE,
- 'zh-tw' => TRUE,
-
- // Reference: Apache 2.0.59 default 'index.html' variants
- 'ee' => TRUE,
- 'lb' => TRUE,
- 'var' => TRUE,
- );
-
- static $charset_suffix = array(
- // Reference: Apache 2.0.59 'AddCharset' default
- 'iso8859-1' => TRUE, // ISO-8859-1
- 'latin1' => TRUE, // ISO-8859-1
- 'iso8859-2' => TRUE, // ISO-8859-2
- 'latin2' => TRUE, // ISO-8859-2
- 'cen' => TRUE, // ISO-8859-2
- 'iso8859-3' => TRUE, // ISO-8859-3
- 'latin3' => TRUE, // ISO-8859-3
- 'iso8859-4' => TRUE, // ISO-8859-4
- 'latin4' => TRUE, // ISO-8859-4
- 'iso8859-5' => TRUE, // ISO-8859-5
- 'latin5' => TRUE, // ISO-8859-5
- 'cyr' => TRUE, // ISO-8859-5
- 'iso-ru' => TRUE, // ISO-8859-5
- 'iso8859-6' => TRUE, // ISO-8859-6
- 'latin6' => TRUE, // ISO-8859-6
- 'arb' => TRUE, // ISO-8859-6
- 'iso8859-7' => TRUE, // ISO-8859-7
- 'latin7' => TRUE, // ISO-8859-7
- 'grk' => TRUE, // ISO-8859-7
- 'iso8859-8' => TRUE, // ISO-8859-8
- 'latin8' => TRUE, // ISO-8859-8
- 'heb' => TRUE, // ISO-8859-8
- 'iso8859-9' => TRUE, // ISO-8859-9
- 'latin9' => TRUE, // ISO-8859-9
- 'trk' => TRUE, // ISO-8859-9
- 'iso2022-jp'=> TRUE, // ISO-2022-JP
- 'jis' => TRUE, // ISO-2022-JP
- 'iso2022-kr'=> TRUE, // ISO-2022-KR
- 'kis' => TRUE, // ISO-2022-KR
- 'iso2022-cn'=> TRUE, // ISO-2022-CN
- 'cis' => TRUE, // ISO-2022-CN
- 'big5' => TRUE,
- 'cp-1251' => TRUE, // ru, WINDOWS-1251
- 'win-1251' => TRUE, // ru, WINDOWS-1251
- 'cp866' => TRUE, // ru
- 'koi8-r' => TRUE, // ru, KOI8-r
- 'koi8-ru' => TRUE, // ru, KOI8-r
- 'koi8-uk' => TRUE, // ru, KOI8-ru
- 'ua' => TRUE, // ru, KOI8-ru
- 'ucs2' => TRUE, // ru, ISO-10646-UCS-2
- 'ucs4' => TRUE, // ru, ISO-10646-UCS-4
- 'utf8' => TRUE,
-
- // Reference: Apache 2.0.59 default 'index.html' variants
- 'euc-kr' => TRUE,
- 'gb2312' => TRUE,
- );
-
- // May uncompress by web browsers on the fly
- // Must be at the last of the filename
- // Reference: Apache 2.0.59 'AddEncoding'
- static $encoding_suffix = array(
- 'z' => TRUE,
- 'gz' => TRUE,
- );
-
- if (! is_string($file)) return '';
- $_file = strtolower($file);
- if (isset($simple_defaults[$_file])) return '';
-
-
- // Roughly removing language/character-set/encoding suffixes
- // References:
- // * Apache 2 document about 'Content-negotiaton', 'mod_mime' and 'mod_negotiation'
- // http://httpd.apache.org/docs/2.0/content-negotiation.html
- // http://httpd.apache.org/docs/2.0/mod/mod_mime.html
- // http://httpd.apache.org/docs/2.0/mod/mod_negotiation.html
- // * http://www.iana.org/assignments/character-sets
- // * RFC3066: Tags for the Identification of Languages
- // http://www.ietf.org/rfc/rfc3066.txt
- // * ISO 639: codes of 'language names'
- $suffixes = explode('.', $_file);
- $body = array_shift($suffixes);
- if ($suffixes) {
- // Remove the last .gz/.z
- $last_key = end(array_keys($suffixes));
- if (isset($encoding_suffix[$suffixes[$last_key]])) {
- unset($suffixes[$last_key]);
- }
- }
- // Cut language and charset suffixes
- foreach($suffixes as $key => $value){
- if (isset($language_suffix[$value]) || isset($charset_suffix[$value])) {
- unset($suffixes[$key]);
- }
- }
- if (empty($suffixes)) return $body;
-
- // Index.xxx
- $count = count($suffixes);
- reset($suffixes);
- $current = current($suffixes);
- if ($body == 'index' && $count == 1 && isset($content_suffix[$current])) return '';
-
- return $file;
-}
-
-// Sort query-strings if possible (Destructive and rough)
-// [OK] &&&&f=d&b&d&c&a=0dd => a=0dd&b&c&d&f=d
-// [OK] nothing==&eg=dummy&eg=padding&eg=foobar => eg=foobar
-function query_normalize($string = '', $equal = TRUE, $equal_cutempty = TRUE, $stortolower = TRUE)
-{
- if (! is_string($string)) return '';
- if ($stortolower) $string = strtolower($string);
-
- $array = explode('&', $string);
-
- // Remove '&' paddings
- foreach(array_keys($array) as $key) {
- if ($array[$key] == '') {
- unset($array[$key]);
- }
- }
-
- // Consider '='-sepalated input and paddings
- if ($equal) {
- $equals = $not_equals = array();
- foreach ($array as $part) {
- if (strpos($part, '=') === FALSE) {
- $not_equals[] = $part;
- } else {
- list($key, $value) = explode('=', $part, 2);
- $value = ltrim($value, '=');
- if (! $equal_cutempty || $value != '') {
- $equals[$key] = $value;
- }
- }
- }
-
- $array = & $not_equals;
- foreach ($equals as $key => $value) {
- $array[] = $key . '=' . $value;
- }
- unset($equals);
- }
-
- natsort($array);
- return implode('&', $array);
-}
-
-// ---------------------
-// Part One : Checker