/admin/lib/bad-behavior/common_tests.inc.php
PHP | 143 lines | 83 code | 20 blank | 40 comment | 41 complexity | b25a320a0fe40d2b8cefb98f12137b93 MD5 | raw file
- <?php if (!defined('BB2_CORE')) die('I said no cheating!');
- // Enforce adherence to protocol version claimed by user-agent.
- function bb2_protocol($settings, $package)
- {
- // Is it claiming to be HTTP/1.0? Then it shouldn't do HTTP/1.1 things
- // Always run this test; we should never see Expect:
- if (array_key_exists('Expect', $package['headers_mixed']) && stripos($package['headers_mixed']['Expect'], "100-continue") !== FALSE) {
- return "a0105122";
- }
- // Is it claiming to be HTTP/1.1? Then it shouldn't do HTTP/1.0 things
- // Blocks some common corporate proxy servers in strict mode
- if ($settings['strict'] && !strcmp($package['server_protocol'], "HTTP/1.1")) {
- if (array_key_exists('Pragma', $package['headers_mixed']) && strpos($package['headers_mixed']['Pragma'], "no-cache") !== FALSE && !array_key_exists('Cache-Control', $package['headers_mixed'])) {
- return "41feed15";
- }
- }
- return false;
- }
- function bb2_cookies($settings, $package)
- {
- // Enforce RFC 2965 sec 3.3.5 and 9.1
- // Bots wanting new-style cookies should send Cookie2
- // FIXME: Amazon Kindle is broken; Amazon has been notified 9/24/08
- if (@strpos($package['headers_mixed']['Cookie'], '$Version=0') !== FALSE && !array_key_exists('Cookie2', $package['headers_mixed']) && strpos($package['headers_mixed']['User-Agent'], "Kindle/") === FALSE) {
- return '6c502ff1';
- }
- return false;
- }
- function bb2_misc_headers($settings, $package)
- {
- @$ua = $package['headers_mixed']['User-Agent'];
- if (!strcmp($package['request_method'], "POST") && empty($ua)) {
- return "f9f2b8b9";
- }
- // Broken spambots send URLs with various invalid characters
- // Some broken browsers send the #vector in the referer field :(
- // if (strpos($package['request_uri'], "#") !== FALSE || strpos($package['headers_mixed']['Referer'], "#") !== FALSE) {
- if (strpos($package['request_uri'], "#") !== FALSE) {
- return "dfd9b1ad";
- }
- // A pretty nasty SQL injection attack on IIS servers
- if (strpos($package['request_uri'], ";DECLARE%20@") !== FALSE) {
- return "dfd9b1ad";
- }
- // Range: field exists and begins with 0
- // Real user-agents do not start ranges at 0
- // NOTE: this blocks the whois.sc bot. No big loss.
- // Exceptions: MT (not fixable); LJ (refuses to fix; may be
- // blocked again in the future)
- if ($settings['strict'] && array_key_exists('Range', $package['headers_mixed']) && strpos($package['headers_mixed']['Range'], "=0-") !== FALSE) {
- if (strncmp($ua, "MovableType", 11) && strncmp($ua, "URI::Fetch", 10) && strncmp($ua, "php-openid/", 11)) {
- return "7ad04a8a";
- }
- }
- // Content-Range is a response header, not a request header
- if (array_key_exists('Content-Range', $package['headers_mixed'])) {
- return '7d12528e';
- }
- // Lowercase via is used by open proxies/referrer spammers
- // Exceptions: Clearswift uses lowercase via (refuses to fix;
- // may be blocked again in the future)
- if (array_key_exists('via', $package['headers']) &&
- strpos($package['headers']['via'],'Clearswift') === FALSE &&
- strpos($ua,'CoralWebPrx') === FALSE) {
- return "9c9e4979";
- }
- // pinappleproxy is used by referrer spammers
- if (array_key_exists('Via', $package['headers_mixed'])) {
- if (stripos($package['headers_mixed']['Via'], "pinappleproxy") !== FALSE || stripos($package['headers_mixed']['Via'], "PCNETSERVER") !== FALSE || stripos($package['headers_mixed']['Via'], "Invisiware") !== FALSE) {
- return "939a6fbb";
- }
- }
- // TE: if present must have Connection: TE
- // RFC 2616 14.39
- // Blocks Microsoft ISA Server 2004 in strict mode. Contact Microsoft
- // to obtain a hotfix.
- if ($settings['strict'] && array_key_exists('Te', $package['headers_mixed'])) {
- if (!preg_match('/\bTE\b/', $package['headers_mixed']['Connection'])) {
- return "582ec5e4";
- }
- }
- if (array_key_exists('Connection', $package['headers_mixed'])) {
- // Connection: keep-alive and close are mutually exclusive
- if (preg_match('/\bKeep-Alive\b/i', $package['headers_mixed']['Connection']) && preg_match('/\bClose\b/i', $package['headers_mixed']['Connection'])) {
- return "a52f0448";
- }
- // Close shouldn't appear twice
- if (preg_match('/\bclose,\s?close\b/i', $package['headers_mixed']['Connection'])) {
- return "a52f0448";
- }
- // Keey-Alive shouldn't appear twice either
- if (preg_match('/\bkeep-alive,\s?keep-alive\b/i', $package['headers_mixed']['Connection'])) {
- return "a52f0448";
- }
- }
-
- // Headers which are not seen from normal user agents; only malicious bots
- if (array_key_exists('X-Aaaaaaaaaaaa', $package['headers_mixed']) || array_key_exists('X-Aaaaaaaaaa', $package['headers_mixed'])) {
- return "b9cc1d86";
- }
- // Proxy-Connection does not exist and should never be seen in the wild
- if (array_key_exists('Proxy-Connection', $package['headers_mixed'])) {
- return "b7830251";
- }
- if (array_key_exists('Referer', $package['headers_mixed'])) {
- // Referer, if it exists, must not be blank
- if (empty($package['headers_mixed']['Referer'])) {
- return "69920ee5";
- }
- // Referer, if it exists, must contain a :
- // While a relative URL is technically valid in Referer, all known
- // legit user-agents send an absolute URL
- if (strpos($package['headers_mixed']['Referer'], ":") === FALSE) {
- return "45b35e30";
- }
- }
-
- // "uk" is not a language (ISO 639) nor a country (ISO 3166)
- // oops, yes it is :( Please shoot any Ukrainian spammers you see.
- # if (preg_match('/\buk\b/', $package['headers_mixed']['Accept-Language'])) {
- # return "35ea7ffa";
- # }
- return false;
- }
- ?>