<?php
-// $Id: spam.php,v 1.14 2006/11/12 04:27:11 henoheno Exp $
-// Copyright (C) 2006 PukiWiki Developers Team
+// $Id: spam.php,v 1.125 2007/03/10 01:30:14 henoheno Exp $
+// Copyright (C) 2006-2007 PukiWiki Developers Team
// License: GPL v2 or (at your option) any later version
-
+//
// Functions for Concept-work of spam-uri metrics
+//
+// (PHP 4 >= 4.3.0): preg_match_all(PREG_OFFSET_CAPTURE): $method['uri_XXX'] related feature
-// Return an array of normalized/parsed URIs in the $string
-// [OK] http://nasty.example.org#nasty_string
-// [OK] http://nasty.example.org/foo/xxx#nasty_string/bar
-// [OK] ftp://dfshodfs:80/dfsdfs
-// [OK] http://victim.example.org/go?http%3A%2F%2Fnasty.example.org
-// [OK] http://victim.example.org/gphttp://nasty.example.org
-function spam_pickup($string = '')
+if (! defined('SPAM_INI_FILE')) define('SPAM_INI_FILE', 'spam.ini.php');
+
+// ---------------------
+// Compat etc
+
+// (PHP 4 >= 4.2.0): var_export(): mail-reporting and dump related
+if (! function_exists('var_export')) {
+ function var_export() {
+ return 'var_export() is not found on this server' . "\n";
+ }
+}
+
+// (PHP 4 >= 4.2.0): preg_grep() enables invert option
+function preg_grep_invert($pattern = '//', $input = array())
{
- // Preprocess: urldecode() and adding space(s)
- $string = preg_replace(
- array(
- '#(?:https?|ftp):/#',
- '#\b[a-z][a-z0-9.+-]{1,8}://#i',
- '#[a-z][a-z0-9.+-]{1,8}://#i'
- ), ' $0', rawurldecode($string));
+ static $invert;
+ if (! isset($invert)) $invert = defined('PREG_GREP_INVERT');
- // URI pickup: Not available for user@password, IDN, Fragment(=ignored)
+ if ($invert) {
+ return preg_grep($pattern, $input, PREG_GREP_INVERT);
+ } else {
+ $result = preg_grep($pattern, $input);
+ if ($result) {
+ return array_diff($input, preg_grep($pattern, $input));
+ } else {
+ return $input;
+ }
+ }
+}
+
+// ---------------------
+// URI pickup
+
+// Return an array of URIs in the $string
+// [OK] http://nasty.example.org#nasty_string
+// [OK] http://nasty.example.org:80/foo/xxx#nasty_string/bar
+// [OK] ftp://nasty.example.org:80/dfsdfs
+// [OK] ftp://cnn.example.com&story=breaking_news@10.0.0.1/top_story.htm (from RFC3986)
+function uri_pickup($string = '', $normalize = TRUE,
+ $preserve_rawuri = FALSE, $preserve_chunk = TRUE)
+{
+ // Not available for: IDN(ignored)
$array = array();
preg_match_all(
- // Refer RFC3986
- '#(\b[a-z][a-z0-9.+-]{1,8})://' . // 1: Scheme
+ // scheme://userinfo@host:port/path/or/pathinfo/maybefile.and?query=string#fragment
+ // Refer RFC3986 (Regex below is not strict)
+ '#(\b[a-z][a-z0-9.+-]{1,8}):/+' . // 1: Scheme
+ '(?:' .
+ '([^\s<>"\'\[\]/\#?@]*)' . // 2: Userinfo (Username)
+ '@)?' .
'(' .
- // 2: Host
+ // 3: Host
'\[[0-9a-f:.]+\]' . '|' . // IPv6([colon-hex and dot]): RFC2732
- '(?:[0-9]{1-3}\.){3}[0-9]{1-3}' . '|' . // IPv4(dot-decimal): 001.22.3.44
- '[^\s<>"\'\[\]:/\#?]+' . // FQDN: foo.example.org
+ '(?:[0-9]{1,3}\.){3}[0-9]{1,3}' . '|' . // IPv4(dot-decimal): 001.22.3.44
+ '[a-z0-9.-]+' . // hostname(FQDN) : foo.example.org
')' .
- '(?::([a-z0-9]{2,}))?' . // 3: Port
- '((?:/+[^\s<>"\'\[\]/\#]+)*/+)?' . // 4: Directory path or path-info
- '([^\s<>"\'\[\]\#]+)?' . // 5: File and query string
- // #: Fragment(ignored)
+ '(?::([0-9]*))?' . // 4: Port
+ '((?:/+[^\s<>"\'\[\]/\#]+)*/+)?' . // 5: Directory path or path-info
+ '([^\s<>"\'\[\]\#?]+)?' . // 6: File?
+ '(?:\?([^\s<>"\'\[\]\#]+))?' . // 7: Query string
+ '(?:\#([a-z0-9._~%!$&\'()*+,;=:@-]*))?' . // 8: Fragment
'#i',
- $string, $array, PREG_SET_ORDER | PREG_OFFSET_CAPTURE);
- //var_dump(recursive_map('htmlspecialchars', $array));
+ $string, $array, PREG_SET_ORDER | PREG_OFFSET_CAPTURE
+ );
+
// Shrink $array
- $parts = array(1 => 'scheme', 2 => 'host', 3 => 'port',
- 4 => 'path', 5 => 'file');
+ static $parts = array(
+ 1 => 'scheme', 2 => 'userinfo', 3 => 'host', 4 => 'port',
+ 5 => 'path', 6 => 'file', 7 => 'query', 8 => 'fragment'
+ );
$default = array('');
foreach(array_keys($array) as $uri) {
- unset($array[$uri][0]); // Matched string itself
- array_rename_keys($array[$uri], $parts, TRUE, $default);
- $offset = $array[$uri]['scheme'][1]; // Scheme's offset
-
- // Remove offsets (with normalization)
- foreach(array_keys($array[$uri]) as $part) {
- $array[$uri][$part] =
- strtolower($array[$uri][$part][0]);
+ $_uri = & $array[$uri];
+ array_rename_keys($_uri, $parts, TRUE, $default);
+
+ $offset = $_uri['scheme'][1]; // Scheme's offset
+ foreach(array_keys($_uri) as $part) {
+ // Remove offsets for each part
+ $_uri[$part] = & $_uri[$part][0];
}
- //$array[$uri]['path'] = path_normalize($array[$uri]['path']);
- $array[$uri]['offset'] = $offset;
- $array[$uri]['area'] = 0;
- }
- // Area elevation for '(especially external)link' intension
- if (! empty($array)) {
- // Anchor tags by preg_match_all()
- // [OK] <a href="http://nasty.example.com">visit http://nasty.example.com/</a>
- // [OK] <a href=\'http://nasty.example.com/\' >discount foobar</a>
- // [NG] <a href="http://ng.example.com">visit http://ng.example.com _not_ended_
- // [NG] <a href= >Good site!</a> <a href= "#" >test</a>
- $areas = array();
- preg_match_all('#<a\b[^>]*href[^>]*>.*?</a\b[^>]*(>)#i',
- $string, $areas, PREG_SET_ORDER | PREG_OFFSET_CAPTURE);
- //var_dump(recursive_map('htmlspecialchars', $areas));
- foreach(array_keys($areas) as $area) {
- $areas[$area] = array(
- $areas[$area][0][1], // [0][1] = Area start (<a href>)
- $areas[$area][1][1], // [1][1] = Area end (</a>)
- );
+ if ($normalize) {
+ $_uri['scheme'] = scheme_normalize($_uri['scheme']);
+ if ($_uri['scheme'] === '') {
+ unset($array[$uri]);
+ continue;
+ }
+ $_uri['host'] = host_normalize($_uri['host']);
+ $_uri['port'] = port_normalize($_uri['port'], $_uri['scheme'], FALSE);
+ $_uri['path'] = path_normalize($_uri['path']);
+ if ($preserve_rawuri) $_uri['rawuri'] = & $_uri[0];
+
+ // DEBUG
+ //$_uri['uri'] = uri_array_implode($_uri);
+ } else {
+ $_uri['uri'] = & $_uri[0]; // Raw
}
- area_measure($areas, $array);
-
- // Various Wiki syntax
- // [text_or_uri>text_or_uri]
- // [text_or_uri:text_or_uri]
- // [text_or_uri|text_or_uri]
- // [text_or_uri->text_or_uri]
- // [text_or_uri text_or_uri] // MediaWiki
- // MediaWiki: [http://nasty.example.com/ visit http://nasty.example.com/]
-
- // phpBB's "BBCode" by preg_match_all()
- // [url]http://nasty.example.com/[/url]
- // [link]http://nasty.example.com/[/link]
- // [url=http://nasty.example.com]visit http://nasty.example.com/[/url]
- // [link http://nasty.example.com/]buy something[/link]
- // ?? [url=][/url]
- $areas = array();
- preg_match_all('#\[(url|link)\b[^\]]*\].*?\[/\1\b[^\]]*(\])#i',
- $string, $areas, PREG_SET_ORDER | PREG_OFFSET_CAPTURE);
- //var_dump(recursive_map('htmlspecialchars', $areas));
- foreach(array_keys($areas) as $area) {
- $areas[$area] = array(
- $areas[$area][0][1], // [0][1] = Area start ([url])
- $areas[$area][2][1], // [4][1] = Area end ([/url])
+ unset($_uri[0]); // Matched string itself
+ if (! $preserve_chunk) {
+ unset(
+ $_uri['scheme'],
+ $_uri['userinfo'],
+ $_uri['host'],
+ $_uri['port'],
+ $_uri['path'],
+ $_uri['file'],
+ $_uri['query'],
+ $_uri['fragment']
);
}
- area_measure($areas, $array);
- // Remove 'offset's for area_measure()
- foreach(array_keys($array) as $key)
- unset($array[$key]['offset']);
+ // Area offset for area_measure()
+ $_uri['area']['offset'] = $offset;
}
return $array;
}
+// Destructive normalize of URI array
+// NOTE: Give me the uri_pickup() result with chunks
+function uri_array_normalize(& $pickups, $preserve = TRUE)
+{
+ if (! is_array($pickups)) return $pickups;
+
+ foreach (array_keys($pickups) as $key) {
+ $_key = & $pickups[$key];
+ $_key['path'] = isset($_key['path']) ? strtolower($_key['path']) : '';
+ $_key['file'] = isset($_key['file']) ? file_normalize($_key['file']) : '';
+ $_key['query'] = isset($_key['query']) ? query_normalize(strtolower($_key['query']), TRUE) : '';
+ $_key['fragment'] = (isset($_key['fragment']) && $preserve) ?
+ strtolower($_key['fragment']) : ''; // Just ignore
+ }
+
+ return $pickups;
+}
+
+// An URI array => An URI (See uri_pickup())
+function uri_array_implode($uri = array())
+{
+ if (empty($uri) || ! is_array($uri)) return NULL;
+
+ $tmp = array();
+ if (isset($uri['scheme']) && $uri['scheme'] !== '') {
+ $tmp[] = & $uri['scheme'];
+ $tmp[] = '://';
+ }
+ if (isset($uri['userinfo']) && $uri['userinfo'] !== '') {
+ $tmp[] = & $uri['userinfo'];
+ $tmp[] = '@';
+ }
+ if (isset($uri['host']) && $uri['host'] !== '') {
+ $tmp[] = & $uri['host'];
+ }
+ if (isset($uri['port']) && $uri['port'] !== '') {
+ $tmp[] = ':';
+ $tmp[] = & $uri['port'];
+ }
+ if (isset($uri['path']) && $uri['path'] !== '') {
+ $tmp[] = & $uri['path'];
+ }
+ if (isset($uri['file']) && $uri['file'] !== '') {
+ $tmp[] = & $uri['file'];
+ }
+ if (isset($uri['query']) && $uri['query'] !== '') {
+ $tmp[] = '?';
+ $tmp[] = & $uri['query'];
+ }
+ if (isset($uri['fragment']) && $uri['fragment'] !== '') {
+ $tmp[] = '#';
+ $tmp[] = & $uri['fragment'];
+ }
+
+ return implode('', $tmp);
+}
+
// $array['something'] => $array['wanted']
function array_rename_keys(& $array, $keys = array('from' => 'to'), $force = FALSE, $default = '')
{
- if (! is_array($array) || ! is_array($keys))
- return FALSE;
+ if (! is_array($array) || ! is_array($keys)) return FALSE;
// Nondestructive test
if (! $force)
return TRUE;
}
+// ---------------------
+// Area pickup
+
+// Pickup all of markup areas
+function area_pickup($string = '', $method = array())
+{
+ $area = array();
+ if (empty($method)) return $area;
+
+ // Anchor tag pair by preg_match and preg_match_all()
+ // [OK] <a href></a>
+ // [OK] <a href= >Good site!</a>
+ // [OK] <a href= "#" >test</a>
+ // [OK] <a href="http://nasty.example.com">visit http://nasty.example.com/</a>
+ // [OK] <a href=\'http://nasty.example.com/\' >discount foobar</a>
+ // [NG] <a href="http://ng.example.com">visit http://ng.example.com _not_ended_
+ $regex = '#<a\b[^>]*\bhref\b[^>]*>.*?</a\b[^>]*(>)#i';
+ if (isset($method['area_anchor'])) {
+ $areas = array();
+ $count = isset($method['asap']) ?
+ preg_match($regex, $string) :
+ preg_match_all($regex, $string, $areas);
+ if (! empty($count)) $area['area_anchor'] = $count;
+ }
+ if (isset($method['uri_anchor'])) {
+ $areas = array();
+ preg_match_all($regex, $string, $areas, PREG_SET_ORDER | PREG_OFFSET_CAPTURE);
+ foreach(array_keys($areas) as $_area) {
+ $areas[$_area] = array(
+ $areas[$_area][0][1], // Area start (<a href>)
+ $areas[$_area][1][1], // Area end (</a>)
+ );
+ }
+ if (! empty($areas)) $area['uri_anchor'] = $areas;
+ }
+
+ // phpBB's "BBCode" pair by preg_match and preg_match_all()
+ // [OK] [url][/url]
+ // [OK] [url]http://nasty.example.com/[/url]
+ // [OK] [link]http://nasty.example.com/[/link]
+ // [OK] [url=http://nasty.example.com]visit http://nasty.example.com/[/url]
+ // [OK] [link http://nasty.example.com/]buy something[/link]
+ $regex = '#\[(url|link)\b[^\]]*\].*?\[/\1\b[^\]]*(\])#i';
+ if (isset($method['area_bbcode'])) {
+ $areas = array();
+ $count = isset($method['asap']) ?
+ preg_match($regex, $string) :
+ preg_match_all($regex, $string, $areas, PREG_SET_ORDER);
+ if (! empty($count)) $area['area_bbcode'] = $count;
+ }
+ if (isset($method['uri_bbcode'])) {
+ $areas = array();
+ preg_match_all($regex, $string, $areas, PREG_SET_ORDER | PREG_OFFSET_CAPTURE);
+ foreach(array_keys($areas) as $_area) {
+ $areas[$_area] = array(
+ $areas[$_area][0][1], // Area start ([url])
+ $areas[$_area][2][1], // Area end ([/url])
+ );
+ }
+ if (! empty($areas)) $area['uri_bbcode'] = $areas;
+ }
+
+ // Various Wiki syntax
+ // [text_or_uri>text_or_uri]
+ // [text_or_uri:text_or_uri]
+ // [text_or_uri|text_or_uri]
+ // [text_or_uri->text_or_uri]
+ // [text_or_uri text_or_uri] // MediaWiki
+ // MediaWiki: [http://nasty.example.com/ visit http://nasty.example.com/]
+
+ return $area;
+}
+
// If in doubt, it's a little doubtful
+// if (Area => inside <= Area) $brief += -1
function area_measure($areas, & $array, $belief = -1, $a_key = 'area', $o_key = 'offset')
{
if (! is_array($areas) || ! is_array($array)) return;
}
}
+// ---------------------
+// Spam-uri pickup
+
+// Domain exposure callback (See spam_uri_pickup_preprocess())
+// http://victim.example.org/?foo+site:nasty.example.com+bar
+// => http://nasty.example.com/?refer=victim.example.org
+// NOTE: 'refer=' is not so good for (at this time).
+// Consider about using IP address of the victim, try to avoid that.
+function _preg_replace_callback_domain_exposure($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 $result;
+}
+
+// Preprocess: rawurldecode() and adding space(s) and something
+// to detect/count some URIs _if possible_
+// NOTE: It's maybe danger to var_dump(result). [e.g. 'javascript:']
+// [OK] http://victim.example.org/go?http%3A%2F%2Fnasty.example.org
+// [OK] http://victim.example.org/http://nasty.example.org
+// TODO: link.toolbot.com, urlx.org
+function spam_uri_pickup_preprocess($string = '')
+{
+ if (! is_string($string)) return '';
+
+ $string = rawurldecode($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 $string;
+}
+
+// Main function of spam-uri pickup
+function spam_uri_pickup($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 $array;
+}
+
// ---------------------
-// Part Two
+// Normalization
+
+// Scheme normalization: Renaming the schemes
+// snntp://example.org => nntps://example.org
+// NOTE: Keep the static lists simple. See also port_normalize().
+function scheme_normalize($scheme = '', $considerd_harmfull = TRUE)
+{
+ // Abbreviations considerable they don't have link intension
+ static $abbrevs = array(
+ 'ttp' => 'http',
+ 'ttps' => 'https',
+ );
+
+ // Alias => normalized
+ static $aliases = array(
+ 'pop' => 'pop3',
+ 'news' => 'nntp',
+ 'imap4' => 'imap',
+ 'snntp' => 'nntps',
+ 'snews' => 'nntps',
+ 'spop3' => 'pop3s',
+ 'pops' => 'pop3s',
+ );
+
+ $scheme = strtolower(trim($scheme));
+ if (isset($abbrevs[$scheme])) {
+ if ($considerd_harmfull) {
+ $scheme = $abbrevs[$scheme];
+ } else {
+ $scheme = '';
+ }
+ }
+ if (isset($aliases[$scheme])) $scheme = $aliases[$scheme];
+
+ return $scheme;
+}
+
+// Hostname normlization
+// www.foo => www.foo ('foo' seems TLD)
+// www.foo.bar => foo.bar
+// www.10.20 => www.10.20 (Invalid hostname)
+// NOTE:
+// 'www' is mostly used as traditional hostname of WWW server.
+// 'www.foo.bar' may be identical with 'foo.bar'.
+function host_normalize($host = '')
+{
+ $host = strtolower($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 = TRUE)
+{
+ // 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,
+ );
+
+ $port = trim($port);
+ if ($port === '') return $port;
+
+ if ($scheme_normalize) $scheme = scheme_normalize($scheme);
+ if (isset($array[$scheme]) && $port == $array[$scheme])
+ $port = ''; // Ignore the defaults
+
+ return $port;
+}
// Path normalization
-// example.org => example.org/
-// example.org#hoge -> example.org/#hoge
-// example.org/path/a/b/./c////./d -> example.org/path/a/b/c/d
-// example.org/path/../../a/../back
+// http://example.org => http://example.org/
+// http://example.org#hoge => http://example.org/#hoge
+// http://example.org/path/a/b/./c////./d => http://example.org/path/a/b/c/d
+// http://example.org/path/../../a/../back => http://example.org/back
function path_normalize($path = '', $divider = '/', $addroot = TRUE)
{
- if (! is_string($path) || $path == '') {
- $path = $addroot ? $divider : '';
+ if (! is_string($path) || $path == '')
+ return $addroot ? $divider : '';
+
+ $path = trim($path);
+ $last = ($path[strlen($path) - 1] == $divider) ? $divider : '';
+ $array = explode($divider, $path);
+
+ // Remove paddings
+ foreach(array_keys($array) as $key) {
+ if ($array[$key] == '' || $array[$key] == '.')
+ unset($array[$key]);
+ }
+ // Back-track
+ $tmp = array();
+ foreach($array as $value) {
+ if ($value == '..') {
+ array_pop($tmp);
+ } else {
+ array_push($tmp, $value);
+ }
+ }
+ $array = & $tmp;
+
+ $path = $addroot ? $divider : '';
+ if (! empty($array)) $path .= implode($divider, $array) . $last;
+
+ return $path;
+}
+
+// DirectoryIndex normalize (Destructive and rough)
+function file_normalize($string = 'index.html.en')
+{
+ static $array = array(
+ 'index' => TRUE, // Some system can omit the suffix
+ 'index.htm' => TRUE,
+ 'index.html' => TRUE,
+ 'index.shtml' => TRUE,
+ 'index.jsp' => TRUE,
+ 'index.php' => TRUE,
+ 'index.php3' => TRUE,
+ 'index.php4' => TRUE,
+ //'index.pl' => TRUE,
+ //'index.py' => TRUE,
+ //'index.rb' => TRUE,
+ 'index.cgi' => TRUE,
+ 'default.htm' => TRUE,
+ 'default.html' => TRUE,
+ 'default.asp' => TRUE,
+ 'default.aspx' => TRUE,
+ );
+
+ // Content-negothiation filter:
+ // Roughly removing ISO 639 -like
+ // 2-letter suffixes (See RFC3066)
+ $matches = array();
+ if (preg_match('/(.*)\.[a-z][a-z](?:-[a-z][a-z])?$/i', $string, $matches)) {
+ $_string = $matches[1];
} else {
- $path = trim($path);
- $last = ($path[strlen($path) - 1] == $divider) ? $divider : '';
- $array = explode($divider, $path);
-
- // Remove paddings
- foreach(array_keys($array) as $key) {
- if ($array[$key] == '' || $array[$key] == '.')
- unset($array[$key]);
+ $_string = & $string;
+ }
+
+ if (isset($array[strtolower($_string)])) {
+ return '';
+ } else {
+ return $string;
+ }
+}
+
+// Sort query-strings if possible (Destructive and rough)
+// [OK] &&&&f=d&b&d&c&a=0dd => a=0dd&b&c&d&f=d
+// [OK] nothing==&eg=dummy&eg=padding&eg=foobar => eg=foobar
+function query_normalize($string = '', $equal = FALSE, $equal_cutempty = TRUE)
+{
+ $array = explode('&', $string);
+
+ // Remove '&' paddings
+ foreach(array_keys($array) as $key) {
+ if ($array[$key] == '') {
+ unset($array[$key]);
}
- // Back-track
- $tmp = array();
- foreach($array as $value) {
- if ($value == '..') {
- array_pop($tmp);
+ }
+
+ // Consider '='-sepalated input and paddings
+ if ($equal) {
+ $equals = $not_equals = array();
+ foreach ($array as $part) {
+ if (strpos($part, '=') === FALSE) {
+ $not_equals[] = $part;
} else {
- array_push($tmp, $value);
+ list($key, $value) = explode('=', $part, 2);
+ $value = ltrim($value, '=');
+ if (! $equal_cutempty || $value != '') {
+ $equals[$key] = $value;
+ }
}
}
- $array = & $tmp;
- $path = $addroot ? $divider : '';
- if (! empty($array)) $path .= implode($divider, $array) . $last;
+ $array = & $not_equals;
+ foreach ($equals as $key => $value) {
+ $array[] = $key . '=' . $value;
+ }
+ unset($equals);
}
- return $path;
+ natsort($array);
+ return implode('&', $array);
}
-// Input: '/a/b'
-// Output: array('' => array('a' => array('b' => NULL)))
-function array_tree($string, $delimiter = '/', $reverse = FALSE)
+// ---------------------
+// Part One : Checker
+
+// Rough implementation of globbing
+//
+// USAGE: $regex = '/^' . generate_glob_regex('*.txt', '/') . '$/i';
+//
+function generate_glob_regex($string = '', $divider = '/')
{
- // Create a branch
- $tree = NULL;
- $tmps = explode($delimiter, $string);
- if (! $reverse) $tmps = array_reverse($tmps);
- foreach ($tmps as $tmp) {
- $tree = array($tmp => $tree);
- }
- return $tree;
+ static $from = array(
+ 1 => '*',
+ 11 => '?',
+ // 22 => '[', // Maybe cause regex compilation error (e.g. '[]')
+ // 23 => ']', //
+ );
+ static $mid = array(
+ 1 => '_AST_',
+ 11 => '_QUE_',
+ // 22 => '_RBR_',
+ // 23 => '_LBR_',
+ );
+ static $to = array(
+ 1 => '.*',
+ 11 => '.',
+ // 22 => '[',
+ // 23 => ']',
+ );
+
+ $string = str_replace($from, $mid, $string); // Hide
+ $string = preg_quote($string, $divider);
+ $string = str_replace($mid, $to, $string); // Unhide
+
+ return $string;
}
+// Rough hostname checker
+// [OK] 192.168.
+// TODO: Strict digit, 0x, CIDR, IPv6
+function is_ip($string = '')
+{
+ if (preg_match('/^' .
+ '(?:[0-9]{1,3}\.){3}[0-9]{1,3}' . '|' .
+ '(?:[0-9]{1,3}\.){1,3}' . '$/',
+ $string)) {
+ return 4; // Seems IPv4(dot-decimal)
+ } else {
+ return 0; // Seems not IP
+ }
+}
-// ---------------------
-// Part One : Checker
+// Generate host (FQDN, IPv4, ...) regex
+// 'localhost' : Matches with 'localhost' only
+// 'example.org' : Matches with 'example.org', and 'www.example.org'
+// '.example.org' : Matches with ALL FQDN ended with '.example.org'
+// '*.example.org' : Almost the same of '.example.org' except 'www.example.org'
+// '10.20.30.40' : Matches with IPv4 address '10.20.30.40' only
+// '192168.' : Matches with all IPv4 hosts started with '192.'
+// TODO: IPv4, CIDR?, IPv6
+function generate_host_regex($string = '', $divider = '/')
+{
+ if (mb_strpos($string, '.') === FALSE)
+ return generate_glob_regex($string, $divider);
+
+ $result = '';
+ if (is_ip($string)) {
+ // IPv4
+ return generate_glob_regex($string, $divider);
+ } else {
+ // FQDN or something
+ $part = explode('.', $string, 2);
+ if ($part[0] == '') {
+ $part[0] = '(?:.*\.)?'; // And all related FQDN
+ } else if ($part[0] == '*') {
+ $part[0] = '.*\.'; // All subdomains/hosts only
+ } else {
+ return generate_glob_regex($string, $divider);
+ }
+ $part[1] = generate_glob_regex($part[1], $divider);
+ return implode('', $part);
+ }
+}
+
+function get_blocklist($list = '')
+{
+ static $regexs;
+
+ if (! isset($regexs)) {
+ $regexs = array();
+ if (file_exists(SPAM_INI_FILE)) {
+ $blocklist = array();
+ include(SPAM_INI_FILE);
+ // $blocklist['badhost'] = array(
+ // '*.blogspot.com', // Blog services's subdomains (only)
+ // 'IANA-examples' => '#^(?:.*\.)?example\.(?:com|net|org)$#',
+ // );
+ foreach(array('goodhost', 'badhost') as $_list) {
+ if (! isset($blocklist[$list])) continue;
+ foreach ($blocklist[$_list] as $key => $value) {
+ if (is_array($value)) {
+ $regexs[$_list][$key] = array();
+ foreach($value as $_key => $_value) {
+ if (is_string($_key)) {
+ $regexs[$_list][$key][$_key] = $_value; // A regex
+ } else {
+ $regexs[$_list][$key][$_value] =
+ '/^' . generate_host_regex($_value, '/') . '$/i';
+ }
+ }
+ } else {
+ if (is_string($key)) {
+ $regexs[$_list][$key] = $value; // A regex
+ } else {
+ $regexs[$_list][$value] =
+ '/^' . generate_host_regex($value, '/') . '$/i';
+ }
+ }
+ }
+ }
+ }
+ }
+
+ if ($list == '') {
+ return $regexs; // ALL
+ } else if (isset($regexs[$list])) {
+ return $regexs[$list];
+ } else {
+ return array();
+ }
+}
+
+function is_badhost($hosts = array(), $asap = TRUE, & $remains)
+{
+ $result = array();
+ if (! is_array($hosts)) $hosts = array($hosts);
+ foreach(array_keys($hosts) as $key) {
+ if (! is_string($hosts[$key])) unset($hosts[$key]);
+ }
+ if (empty($hosts)) return $result;
+
+ foreach (get_blocklist('goodhost') as $regex) {
+ $hosts = preg_grep_invert($regex, $hosts);
+ }
+ if (empty($hosts)) return $result;
+
+ $tmp = array();
+ foreach (get_blocklist('badhost') as $label => $regex) {
+ if (is_array($regex)) {
+ $result[$label] = array();
+ foreach($regex as $_label => $_regex) {
+ $_group = preg_grep($_regex, $hosts);
+ if ($_group) {
+ $result[$label][$_label] = $_group;
+ $hosts = array_diff($hosts, $_group);
+ if ($asap) break;
+ }
+ }
+ if (empty($result[$label])) unset($result[$label]);
+ } else {
+ $_group = preg_grep($regex, $hosts);
+ if ($_group) {
+ $result[$label] = $_group;
+ $hosts = array_diff($hosts, $result[$label]);
+ if ($asap) break;
+ }
+ }
+ }
+
+ $remains = $hosts;
+
+ return $result;
+}
+
+// Default (enabled) methods and thresholds (for content insertion)
+function check_uri_spam_method($times = 1, $t_area = 0, $rule = TRUE)
+{
+ $times = intval($times);
+ $t_area = intval($t_area);
+
+ $positive = array(
+ // Thresholds
+ 'quantity' => 8 * $times, // Allow N URIs
+ 'non_uniqhost' => 3 * $times, // Allow N duped (and normalized) Hosts
+ //'non_uniquri'=> 3 * $times, // Allow N duped (and normalized) URIs
+
+ // Areas
+ 'area_anchor' => $t_area, // Using <a href> HTML tag
+ 'area_bbcode' => $t_area, // Using [url] or [link] BBCode
+ //'uri_anchor' => $t_area, // URI inside <a href> HTML tag
+ //'uri_bbcode' => $t_area, // URI inside [url] or [link] BBCode
+ );
+ if ($rule) {
+ $bool = array(
+ // Rules
+ //'asap' => TRUE, // Quit or return As Soon As Possible
+ 'uniqhost' => TRUE, // Show uniq host (at block notification mail)
+ 'badhost' => TRUE, // Check badhost
+ );
+ } else {
+ $bool = array();
+ }
+
+ // Remove non-$positive values
+ foreach (array_keys($positive) as $key) {
+ if ($positive[$key] < 0) unset($positive[$key]);
+ }
+
+ return $positive + $bool;
+}
// Simple/fast spam check
-function is_uri_spam($target = '')
+function check_uri_spam($target = '', $method = array())
{
- $is_spam = FALSE;
- $urinum = 0;
+ if (! is_array($method) || empty($method)) {
+ $method = check_uri_spam_method();
+ }
+ $progress = array(
+ 'sum' => array(
+ 'quantity' => 0,
+ 'uniqhost' => 0,
+ 'non_uniqhost'=> 0,
+ 'non_uniquri' => 0,
+ 'badhost' => 0,
+ 'area_anchor' => 0,
+ 'area_bbcode' => 0,
+ 'uri_anchor' => 0,
+ 'uri_bbcode' => 0,
+ ),
+ 'is_spam' => array(),
+ 'method' => & $method,
+ 'remains' => array(),
+ 'error' => array(),
+ );
+ $sum = & $progress['sum'];
+ $is_spam = & $progress['is_spam'];
+ $remains = & $progress['remains'];
+ $error = & $progress['error'];
+ $asap = isset($method['asap']);
+ // Recurse
if (is_array($target)) {
foreach($target as $str) {
// Recurse
- list($is_spam, $_urinum) = is_uri_spam($str);
- $urinum += $_urinum;
- if ($is_spam) break;
- }
- } else {
- $pickups = spam_pickup($target);
- $urinum += count($pickups);
- if (! empty($pickups)) {
- // Some users want to post some URLs, but ...
- if ($urinum > 8) {
- $is_spam = TRUE; // Too many!
- } else {
- foreach($pickups as $pickup) {
- if ($pickup['area'] < 0) {
- $is_spam = TRUE;
- break;
+ $_progress = check_uri_spam($str, $method);
+ $_sum = & $_progress['sum'];
+ $_is_spam = & $_progress['is_spam'];
+ $_remains = & $_progress['remains'];
+ $_error = & $_progress['error'];
+ foreach (array_keys($_sum) as $key) {
+ $sum[$key] += $_sum[$key];
+ }
+ foreach (array_keys($_is_spam) as $key) {
+ if (is_array($_is_spam[$key])) {
+ // Marge keys (badhost)
+ foreach(array_keys($_is_spam[$key]) as $_key) {
+ if (! isset($is_spam[$key][$_key])) {
+ $is_spam[$key][$_key] = $_is_spam[$key][$_key];
+ } else {
+ $is_spam[$key][$_key] += $_is_spam[$key][$_key];
+ }
}
+ } else {
+ $is_spam[$key] = TRUE;
}
}
+ foreach ($_remains as $key=>$value) {
+ foreach ($value as $_key=>$_value) {
+ if (is_int($_key)) {
+ $remains[$key][] = $_value;
+ } else {
+ $remains[$key][$_key] = $_value;
+ }
+ }
+ }
+ if (! empty($_error)) $error += $_error;
+ if ($asap && $is_spam) break;
}
+ return $progress;
}
- return array($is_spam, $urinum);
-}
+ // Area: There's HTML anchor tag
+ if ((! $asap || ! $is_spam) && isset($method['area_anchor'])) {
+ $key = 'area_anchor';
+ $_asap = isset($method['asap']) ? array('asap' => TRUE) : array();
+ $result = area_pickup($target, array($key => TRUE) + $_asap);
+ if ($result) {
+ $sum[$key] = $result[$key];
+ if (isset($method[$key]) && $sum[$key] > $method[$key]) {
+ $is_spam[$key] = TRUE;
+ }
+ }
+ }
-// ---------------------
+ // Area: There's 'BBCode' linking tag
+ if ((! $asap || ! $is_spam) && isset($method['area_bbcode'])) {
+ $key = 'area_bbcode';
+ $_asap = isset($method['asap']) ? array('asap' => TRUE) : array();
+ $result = area_pickup($target, array($key => TRUE) + $_asap);
+ if ($result) {
+ $sum[$key] = $result[$key];
+ if (isset($method[$key]) && $sum[$key] > $method[$key]) {
+ $is_spam[$key] = TRUE;
+ }
+ }
+ }
+
+ // Return if ...
+ if ($asap && $is_spam) return $progress;
+
+ // URI: Pickup
+ $pickups = spam_uri_pickup($target, $method);
+ //$remains['uri_pickup'] = & $pickups;
+
+ // Return if ...
+ if (empty($pickups)) return $progress;
+
+ // URI: Check quantity
+ $sum['quantity'] += count($pickups);
+ // URI quantity
+ if ((! $asap || ! $is_spam) && isset($method['quantity']) &&
+ $sum['quantity'] > $method['quantity']) {
+ $is_spam['quantity'] = TRUE;
+ }
+
+ // URI: used inside HTML anchor tag pair
+ if ((! $asap || ! $is_spam) && isset($method['uri_anchor'])) {
+ $key = 'uri_anchor';
+ foreach($pickups as $pickup) {
+ if (isset($pickup['area'][$key])) {
+ $sum[$key] += $pickup['area'][$key];
+ if(isset($method[$key]) &&
+ $sum[$key] > $method[$key]) {
+ $is_spam[$key] = TRUE;
+ if ($asap && $is_spam) break;
+ }
+ if ($asap && $is_spam) break;
+ }
+ }
+ }
+
+ // URI: used inside 'BBCode' pair
+ if ((! $asap || ! $is_spam) && isset($method['uri_bbcode'])) {
+ $key = 'uri_bbcode';
+ foreach($pickups as $pickup) {
+ if (isset($pickup['area'][$key])) {
+ $sum[$key] += $pickup['area'][$key];
+ if(isset($method[$key]) &&
+ $sum[$key] > $method[$key]) {
+ $is_spam[$key] = TRUE;
+ if ($asap && $is_spam) break;
+ }
+ if ($asap && $is_spam) break;
+ }
+ }
+ }
+
+ // URI: Uniqueness (and removing non-uniques)
+ if ((! $asap || ! $is_spam) && isset($method['non_uniquri'])) {
+
+ // Destructive normalize of URIs
+ uri_array_normalize($pickups);
+
+ $uris = array();
+ foreach (array_keys($pickups) as $key) {
+ $uris[$key] = uri_array_implode($pickups[$key]);
+ }
+ $count = count($uris);
+ $uris = array_unique($uris);
+ $sum['non_uniquri'] += $count - count($uris);
+ if ($sum['non_uniquri'] > $method['non_uniquri']) {
+ $is_spam['non_uniquri'] = TRUE;
+ }
+ if (! $asap || ! $is_spam) {
+ foreach (array_diff(array_keys($pickups),
+ array_keys($uris)) as $remove) {
+ unset($pickups[$remove]);
+ }
+ }
+ unset($uris);
+ }
+
+ // Return if ...
+ if ($asap && $is_spam) return $progress;
+
+ // Host: Uniqueness (uniq / non-uniq)
+ $hosts = array();
+ foreach ($pickups as $pickup) $hosts[] = & $pickup['host'];
+ $hosts = array_unique($hosts);
+ //$remains['uniqhost'] = & $hosts;
+ $sum['uniqhost'] += count($hosts);
+ if ((! $asap || ! $is_spam) && isset($method['non_uniqhost'])) {
+ $sum['non_uniqhost'] = $sum['quantity'] - $sum['uniqhost'];
+ if ($sum['non_uniqhost'] > $method['non_uniqhost']) {
+ $is_spam['non_uniqhost'] = TRUE;
+ }
+ }
+
+ // Return if ...
+ if ($asap && $is_spam) return $progress;
+
+ // URI: Bad host
+ if ((! $asap || ! $is_spam) && isset($method['badhost'])) {
+ $__remains = array();
+ $badhost = is_badhost($hosts, $asap, $__remains);
+ if (! $asap) {
+ if ($__remains) {
+ $remains['badhost'] = array();
+ foreach ($__remains as $value) {
+ $remains['badhost'][$value] = TRUE;
+ }
+ }
+ }
+ unset($__remains);
+ if (! empty($badhost)) {
+ $sum['badhost'] += array_count_leaves($badhost);
+ foreach(array_keys($badhost) as $keys) {
+ $is_spam['badhost'][$keys] =
+ array_count_leaves($badhost[$keys]);
+ }
+ unset($badhost);
+ }
+ }
-// Check User-Agent
-function is_invalid_useragent($ua_name = '' /*, $ua_vars = ''*/ )
+ return $progress;
+}
+
+// Count leaves
+function array_count_leaves($array = array(), $count_empty_array = FALSE)
{
- return $ua_name === '';
+ if (! is_array($array) || (empty($array) && $count_empty_array))
+ return 1;
+
+ // Recurse
+ $result = 0;
+ foreach ($array as $part) {
+ $result += array_count_leaves($part, $count_empty_array);
+ }
+ return $result;
}
// ---------------------
+// Reporting
-// Mail to administrator with more measurement data?
-// Simple/fast spam filter (for one text field)
-function pkwk_spamfilter($action, $page, $target = array('title' => ''))
+// TODO: Don't show unused $method!
+// Summarize $progress (blocked only)
+function summarize_spam_progress($progress = array(), $blockedonly = FALSE)
{
- $is_spam = FALSE;
-
- //$is_spam = is_invalid_useragent('NOTYET');
- if ($is_spam) {
- $action .= ' (Invalid User-Agent)';
+ if ($blockedonly) {
+ $tmp = array_keys($progress['is_spam']);
} else {
- list($is_spam) = is_uri_spam($target);
- }
-
- if ($is_spam) {
- // Mail to administrator(s)
- global $notify, $notify_subject;
- if ($notify) {
- $footer['ACTION'] = $action;
- $footer['PAGE'] = '[blocked] ' . $page;
- $footer['URI'] = get_script_uri() . '?' . rawurlencode($page);
- $footer['USER_AGENT'] = TRUE;
- $footer['REMOTE_ADDR'] = TRUE;
- pkwk_mail_notify($notify_subject, var_export($target, TRUE), $footer);
- unset($footer);
+ $tmp = array();
+ $method = & $progress['method'];
+ if (isset($progress['sum'])) {
+ foreach ($progress['sum'] as $key => $value) {
+ if (isset($method[$key])) {
+ $tmp[] = $key . '(' . $value . ')';
+ }
+ }
}
}
- if ($is_spam) spam_exit();
+ return implode(', ', $tmp);
}
// ---------------------
+// Exit
// Common bahavior for blocking
// NOTE: Call this function from various blocking feature, to disgueise the reason 'why blocked'
-function spam_exit()
+function spam_exit($mode = '', $data = array())
+{
+ switch ($mode) {
+ case '': echo("\n"); break;
+ case 'dump':
+ echo('<pre>' . "\n");
+ echo htmlspecialchars(var_export($data, TRUE));
+ echo('</pre>' . "\n");
+ break;
+ };
+
+ // Force exit
+ exit;
+}
+
+
+// ---------------------
+// Simple filtering
+
+// TODO: Record them
+// Simple/fast spam filter ($target: 'a string' or an array())
+function pkwk_spamfilter($action, $page, $target = array('title' => ''), $method = array(), $exitmode = '')
+{
+ $progress = check_uri_spam($target, $method);
+
+ if (! empty($progress['is_spam'])) {
+ // Mail to administrator(s)
+ pkwk_spamnotify($action, $page, $target, $progress, $method);
+
+ // Exit
+ spam_exit($exitmode, $progress);
+ }
+}
+
+// ---------------------
+// PukiWiki original
+
+// Mail to administrator(s)
+function pkwk_spamnotify($action, $page, $target = array('title' => ''), $progress = array(), $method = array())
{
- die("\n");
+ global $notify, $notify_subject;
+
+ if (! $notify) return;
+
+ $asap = isset($method['asap']);
+
+ $summary['ACTION'] = 'Blocked by: ' . summarize_spam_progress($progress, TRUE);
+ if (! $asap) {
+ $summary['METRICS'] = summarize_spam_progress($progress);
+ }
+ if (isset($progress['is_spam']['badhost'])) {
+ $badhost = array();
+ foreach($progress['is_spam']['badhost'] as $glob=>$number) {
+ $badhost[] = $glob . '(' . $number . ')';
+ }
+ $summary['DETAIL_BADHOST'] = implode(', ', $badhost);
+ }
+ if (! $asap && $progress['remains']['badhost']) {
+ $count = count($progress['remains']['badhost']);
+ $summary['DETAIL_NEUTRAL_HOST'] = $count .
+ ' (' .
+ preg_replace(
+ '/[^, a-z0-9.-]/i', '',
+ implode(', ', array_keys($progress['remains']['badhost']))
+ ) .
+ ')';
+ }
+ $summary['COMMENT'] = $action;
+ $summary['PAGE'] = '[blocked] ' . (is_pagename($page) ? $page : '');
+ $summary['URI'] = get_script_uri() . '?' . rawurlencode($page);
+ $summary['USER_AGENT'] = TRUE;
+ $summary['REMOTE_ADDR'] = TRUE;
+ pkwk_mail_notify($notify_subject, var_export($target, TRUE), $summary, TRUE);
}
?>
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