| 1 | <?php if (!defined('BB2_CORE')) die('I said no cheating!'); |
| 2 | |
| 3 | // Enforce adherence to protocol version claimed by user-agent. |
| 4 | |
| 5 | function bb2_protocol($settings, $package) |
| 6 | { |
| 7 | // Is it claiming to be HTTP/1.0? Then it shouldn't do HTTP/1.1 things |
| 8 | // Always run this test; we should never see Expect: |
| 9 | if (array_key_exists('Expect', $package['headers_mixed']) && stripos($package['headers_mixed']['Expect'], "100-continue") !== FALSE) { |
| 10 | return "a0105122"; |
| 11 | } |
| 12 | |
| 13 | // Is it claiming to be HTTP/1.1? Then it shouldn't do HTTP/1.0 things |
| 14 | // Blocks some common corporate proxy servers in strict mode |
| 15 | if ($settings['strict'] && !strcmp($package['server_protocol'], "HTTP/1.1")) { |
| 16 | if (array_key_exists('Pragma', $package['headers_mixed']) && strpos($package['headers_mixed']['Pragma'], "no-cache") !== FALSE && !array_key_exists('Cache-Control', $package['headers_mixed'])) { |
| 17 | return "41feed15"; |
| 18 | } |
| 19 | } |
| 20 | return false; |
| 21 | } |
| 22 | |
| 23 | function bb2_cookies($settings, $package) |
| 24 | { |
| 25 | // Enforce RFC 2965 sec 3.3.5 and 9.1 |
| 26 | // Bots wanting new-style cookies should send Cookie2 |
| 27 | if (strpos($package['headers_mixed']['Cookie'], '$Version=0') !== FALSE && !array_key_exists('Cookie2', $package['headers_mixed'])) { |
| 28 | return '6c502ff1'; |
| 29 | } |
| 30 | return false; |
| 31 | } |
| 32 | |
| 33 | function bb2_misc_headers($settings, $package) |
| 34 | { |
| 35 | @$ua = $package['headers_mixed']['User-Agent']; |
| 36 | |
| 37 | if (!strcmp($package['request_method'], "POST") && empty($ua)) { |
| 38 | return "f9f2b8b9"; |
| 39 | } |
| 40 | |
| 41 | // Broken spambots send URLs with various invalid characters |
| 42 | // Some broken browsers send the #vector in the referer field :( |
| 43 | // if (strpos($package['request_uri'], "#") !== FALSE || strpos($package['headers_mixed']['Referer'], "#") !== FALSE) { |
| 44 | if (strpos($package['request_uri'], "#") !== FALSE) { |
| 45 | return "dfd9b1ad"; |
| 46 | } |
| 47 | |
| 48 | // Range: field exists and begins with 0 |
| 49 | // Real user-agents do not start ranges at 0 |
| 50 | // NOTE: this blocks the whois.sc bot. No big loss. |
| 51 | // Exceptions: MT (not fixable); LJ (refuses to fix; may be |
| 52 | // blocked again in the future) |
| 53 | if (array_key_exists('Range', $package['headers_mixed']) && strpos($package['headers_mixed']['Range'], "=0-") !== FALSE) { |
| 54 | if (strncmp($ua, "MovableType", 11) && strncmp($ua, "URI::Fetch", 10) && strncmp($ua, "php-openid/", 11)) { |
| 55 | return "7ad04a8a"; |
| 56 | } |
| 57 | } |
| 58 | |
| 59 | // Content-Range is a response header, not a request header |
| 60 | if (array_key_exists('Content-Range', $package['headers_mixed'])) { |
| 61 | return '7d12528e'; |
| 62 | } |
| 63 | |
| 64 | // Lowercase via is used by open proxies/referrer spammers |
| 65 | // Exceptions: Clearswift uses lowercase via (refuses to fix; |
| 66 | // may be blocked again in the future) |
| 67 | if (array_key_exists('via', $package['headers']) && |
| 68 | strpos($package['headers']['via'],'Clearswift') === FALSE) { |
| 69 | return "9c9e4979"; |
| 70 | } |
| 71 | |
| 72 | // pinappleproxy is used by referrer spammers |
| 73 | if (array_key_exists('Via', $package['headers_mixed'])) { |
| 74 | if (stripos($package['headers_mixed']['Via'], "pinappleproxy") !== FALSE || stripos($package['headers_mixed']['Via'], "PCNETSERVER") !== FALSE || stripos($package['headers_mixed']['Via'], "Invisiware") !== FALSE) { |
| 75 | return "939a6fbb"; |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | // TE: if present must have Connection: TE |
| 80 | // RFC 2616 14.39 |
| 81 | // Blocks Microsoft ISA Server 2004 in strict mode. Contact Microsoft |
| 82 | // to obtain a hotfix. |
| 83 | if ($settings['strict'] && array_key_exists('Te', $package['headers_mixed'])) { |
| 84 | if (!preg_match('/\bTE\b/', $package['headers_mixed']['Connection'])) { |
| 85 | return "582ec5e4"; |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | if (array_key_exists('Connection', $package['headers_mixed'])) { |
| 90 | // Connection: keep-alive and close are mutually exclusive |
| 91 | if (preg_match('/\bKeep-Alive\b/i', $package['headers_mixed']['Connection']) && preg_match('/\bClose\b/i', $package['headers_mixed']['Connection'])) { |
| 92 | return "a52f0448"; |
| 93 | } |
| 94 | // Close shouldn't appear twice |
| 95 | if (preg_match('/\bclose,\s?close\b/i', $package['headers_mixed']['Connection'])) { |
| 96 | return "a52f0448"; |
| 97 | } |
| 98 | // Keey-Alive shouldn't appear twice either |
| 99 | if (preg_match('/\bkeep-alive,\s?keep-alive\b/i', $package['headers_mixed']['Connection'])) { |
| 100 | return "a52f0448"; |
| 101 | } |
| 102 | } |
| 103 | |
| 104 | |
| 105 | // Headers which are not seen from normal user agents; only malicious bots |
| 106 | if (array_key_exists('X-Aaaaaaaaaaaa', $package['headers_mixed']) || array_key_exists('X-Aaaaaaaaaa', $package['headers_mixed'])) { |
| 107 | return "b9cc1d86"; |
| 108 | } |
| 109 | // Proxy-Connection does not exist and should never be seen in the wild |
| 110 | if (array_key_exists('Proxy-Connection', $package['headers_mixed'])) { |
| 111 | return "b7830251"; |
| 112 | } |
| 113 | |
| 114 | if (array_key_exists('Referer', $package['headers_mixed'])) { |
| 115 | // Referer, if it exists, must not be blank |
| 116 | if (empty($package['headers_mixed'])) { |
| 117 | return "69920ee5"; |
| 118 | } |
| 119 | |
| 120 | // Referer, if it exists, must contain a : |
| 121 | // While a relative URL is technically valid in Referer, all known |
| 122 | // legit user-agents send an absolute URL |
| 123 | if (strpos($package['headers_mixed']['Referer'], ":") === FALSE) { |
| 124 | return "45b35e30"; |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | // "uk" is not a language (ISO 639) nor a country (ISO 3166) |
| 129 | // oops, yes it is :( Please shoot any Ukrainian spammers you see. |
| 130 | # if (preg_match('/\buk\b/', $package['headers_mixed']['Accept-Language'])) { |
| 131 | # return "35ea7ffa"; |
| 132 | # } |
| 133 | |
| 134 | return false; |
| 135 | } |
| 136 | |
| 137 | ?> |
| 138 | |
