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<?php /* Does emit a CAPTCHA graphic and form fields, which allows to tell real people from bots. Though a textual description is generated as well, this sort of access restriction will knock out visually impaired users, and frustrate all others anyhow. Therefore this should only be used as last resort for defending against spambots. Because of the readable text and the used colorspaces this is a weak implementation, not completely OCR-secure. captcha::form () will return a html string to be inserted into textarea/ [save] <forms> and alike. User input is veryfied with captcha::check (). You should leave the sample COLLEGE.ttf next to this script, else you have to define the _FONT_DIR constant correctly. Use only 1 font type. Creates temporary files, which however get purged automatically after four hours. Public Domain, available via http://freshmeat.net/p/captchaphp Modified to work with WebCalendar by Ray Jones Added translation function calls Formatting to display properly within our layout Disabled textual_riddle function */ #-- config define( 'EWIKI_FONT_DIR', dirname(__FILE__)); // which fonts to use define( 'CAPTCHA_INVERSE', 0); // white or black(=1) define( 'CAPTCHA_TIMEOUT', 5000); // in seconds (=max 4 hours) define( 'CAPTCHA_MAXSIZE', 4500); // preferred image size define( 'CAPTCHA_COOKIE', 'captcha_solved'); // to unlock captcha protection define( 'CAPTCHA_DATA_URLS', 0); // RFC2397-URLs exclude MSIE users define( 'CAPTCHA_TEMP_DIR', 'images/captcha'); /* static - (you could instantiate it, but...) */ class captcha { /* gets parameter from $_REQUEST[] array (POST vars) and so can verify input, @returns boolean */ public static function check () { $to = (int)(time ()/1000000); if ( ! empty ( $_COOKIE[CAPTCHA_COOKIE] ) && $_COOKIE[CAPTCHA_COOKIE] == $to) { return(true); } if (($hash = $_REQUEST['captcha_hash']) and ($pw = trim($_REQUEST['captcha_input']))) { $r = (captcha::hash($pw)==$hash) || (captcha::hash($pw,-1)==$hash); if ($r) { setcookie(CAPTCHA_COOKIE, $to, time ()+1000000); } return($r); } } /* yields <input> fields html string (no complete form), with captcha image already embedded as data:-URI */ public static function form ($save=true) { #-- stop if user already verified if ( $save && ! empty ( $_COOKIE[CAPTCHA_COOKIE] ) && $_COOKIE[CAPTCHA_COOKIE] == (int)(time ()/1000000)) { return ""; } $title = translate ( 'Enter Characters Seen in Graphic' ); $more = translate ( 'Enter the correct letters and numbers...' ); #-- prepare image text $pw = captcha::mkpass (); $hash = captcha::hash($pw); //$alt = htmlentities(captcha::textual_riddle($pw)); $alt = $title; #-- image $img = captcha::image($pw, 200, 60, CAPTCHA_INVERSE, CAPTCHA_MAXSIZE); if (CAPTCHA_DATA_URLS && !strpos ('MSIE', $_SERVER['HTTP_USER_AGENT'])) { $img_fn = 'data:image/jpeg;base64,' . base64_encode($img); } else { $img_fn = CAPTCHA_TEMP_DIR . '/' . captcha::store_image($img) . '.jpg'; } //echo $img_fn; #-- emit html form $html = ' <div class="captcha"> <fieldset style="width:420px"> <legend>' . translate ('Challenge/Response') .'</legend> <table border="0" summary="captcha input" width="400px"><tr> <td colspan="2"><small>'.$more.'</small></td></tr><tr> <td><img name="captcha_image" id="captcha_image" src="' .$img_fn. '" height="60" width="200" alt="' .$alt. '" /></td> <td>'.$title. '<br /><input name="captcha_hash" type="hidden" value="'.$hash. '" /> <input name="captcha_input" type="text" size="7" maxlength="16" style="height:46px;font-size:34px; font-weight:bold;" /> </td></tr></table> </fieldset> </div> '; return($html); } /* generates alternative (non-graphic), human-understandable representation of the passphrase */ function textual_riddle($phrase) { $symbols0 = '"\'-/_:'; $symbols1 = array ("\n,", "\n;", ";", "\n&", "\n-", ",", ",", "\nand then", "\nfollowed by", "\nand", "\nand not a\n\"".chr(65+rand(0,26))."\",\nbut"); $s = "Guess the letters and numbers\n(passphrase riddle)\n--\n"; for ($p=0; $p<strlen($phrase); $p++) { $c = $phrase[$p]; $add = ""; #-- asis if (!rand(0,3)) { $i = $symbols0[rand(0,strlen($symbols0)-1)]; $add = "$i$c$i"; } #-- letter elseif ($c >= 'A') { $type = ($c >= 'a' ? "small " : ""); do { $n = rand(-3,3); $c2 = chr((ord($c) & 0x5F) + $n); } while (($c2 < 'A') || ($c2 > 'Z')); if ($n < 0) { $n = -$n; $add .= "$type'$c2' +$n letters"; } else { $add .= "$n chars before $type$c2"; } } #-- number else { $add = "???"; $n = (int) $c; do { do { $x = rand(1, 10); } while (!$x); $op = rand(0,11); if ($op <= 2) { $add = "($add * $x)"; $n *= $x; } elseif ($op == 3) { $x = 2 * rand(1,2); $add = "($add / $x)"; $n /= $x; } elseif ( ! empty ( $sel ) && $sel % 2) { $add = "($add + $x)"; $n += $x; } else { $add = "($add - $x)"; $n -= $x; } } while (rand(0,1)); $add .= " = $n"; } $s .= "$add"; $s .= $symbols1[rand(0,count($symbols1)-1)] . "\n"; } return($s); } /* returns jpeg file stream with unscannable letters encoded in front of colorful disturbing background */ public static function image($phrase, $width=200, $height=60, $inverse=0, $maxsize=0xFFFFF) { #-- initialize in-memory image with gd library srand(microtime ()*21017); $img = imagecreatetruecolor($width, $height); $R = $inverse ? 0xFF : 0x00; imagefilledrectangle($img, 0,0, $width,$height, captcha::random_color($img, 222^$R, 255^$R)); $c1 = rand(150^$R, 185^$R); $c2 = rand(195^$R, 230^$R); #-- configuration $fonts = array ( // "COLLEGE.ttf", ); $fonts += glob(EWIKI_FONT_DIR."/*.ttf"); #-- encolour bg $wd = 20; $x = 0; $y = $height; while ($x < $width) { imagefilledrectangle($img, $x, 0, $x+=$wd, $height, captcha::random_color($img, 222^$R, 255^$R)); $wd += max(10, rand(0, 20) - 10); } #-- make interesting background I, lines $wd = 4; $w1 = 0; $w2 = 0; for ($x=0; $x<$width; $x+=(int)$wd) { if ($x < $width) { // verical imageline($img, $x+$w1, 0, $x+$w2, $height-1, captcha::random_color($img,$c1,$c2)); } if ($x < $height) { // horizontally ("y") imageline($img, 0, $x-$w2, $width-1, $x-$w1, captcha::random_color($img,$c1,$c2)); } $wd += rand(0,8) - 4; if ($wd < 1) { $wd = 2; } $w1 += rand(0,8) - 4; $w2 += rand(0,8) - 4; if (($x > $height) && ($y > $height)) { break; } } #-- more disturbing II, random letters $limit = rand(30,90); for ($n=0; $n<$limit; $n++) { $letter = ""; do { $letter .= chr(rand(31,125)); // random symbol } while (rand(0,1)); $size = rand(5, $height/2); $half = (int) ($size / 2); $x = rand(-$half, $width+$half); $y = rand(+$half, $height); $rotation = rand(60, 300); $c1 = captcha::random_color($img, 130^$R, 240^$R); $font = $fonts[rand(0, count($fonts)-1)]; imagettftext($img, $size, $rotation, $x, $y, $c1, $font, $letter); } #-- add the real text to it $len = strlen($phrase); $w1 = 10; $w2 = $width / ($len+1); for ($p=0; $p<$len; $p++) { $letter = $phrase[$p]; $size = rand(18, $height/2.2); $half = (int) $size / 2; $rotation = rand(-33, 33); $y = rand($size+3, $height-3); $x = $w1 + $w2*$p; $w1 += rand(-$width/90, $width/40); // @BUG: last char could be +30 pixel outside of image $font = $fonts[rand(0, count($fonts)-1)]; $r=rand(30,99); $g=rand(30,99); $b=rand(30,99); // two colors for shadow $c1 = imagecolorallocate($img, $r*1^$R, $g*1^$R, $b*1^$R); $c2 = imagecolorallocate($img, $r*2^$R, $g*2^$R, $b*2^$R); imagettftext($img, $size, $rotation, $x+1, $y, $c2, $font, $letter); imagettftext($img, $size, $rotation, $x, $y-1, $c1, $font, $letter); } #-- let JFIF stream be generated $quality = 67; $s = array (); do { ob_start (); ob_implicit_flush(0); imagejpeg($img, "", (int)$quality); $jpeg = ob_get_contents (); ob_end_clean (); $size = strlen($jpeg); $s_debug[] = ((int)($quality*10)/10) . "%=$size"; $quality = $quality * ($maxsize/$size) * 0.93 - 1.7; // -($quality/7.222)* } while (($size > $maxsize) && ($quality >= 16)); imagedestroy($img); return($jpeg); } /* helper code */ public static function random_color($img, $a,$b) { return imagecolorallocate($img, rand($a,$b), rand($a,$b), rand($a,$b)); } /* creates temporary file, returns basename */ public static function store_image($data) { $dir = CAPTCHA_TEMP_DIR; $id = md5($data); #-- create temp dir if (!file_exists($dir)) { mkdir($dir) && chmod($dir, 0777); } #-- remove stale files if ($dh = opendir($dir)) { $t_kill = time () - CAPTCHA_TIMEOUT; while($fn = readdir($dh)) if ($fn[0] != ".") { if (filemtime("$dir/$fn") < $t_kill) { @unlink("$dir/$fn"); } } } #-- store file fwrite($f = fopen("$dir/$id.jpg", 'wb'), $data) && fclose($f); return($id); } /* sends it */ function get_image($id) { $dir = CAPTCHA_TEMP_DIR; $fn = "$dir/$id.jpg"; #-- find it if (preg_match('/^\w+$/', $id)) { header('Content-Type: image/jpeg'); readfile($fn); exit; } } /* unreversable hash from passphrase, with time () slice encoded */ public static function hash($text, $dtime=0) { $text = strtolower($text); $pfix = (int) (time () / CAPTCHA_TIMEOUT) + $dtime; return md5("captcha::$pfix:$text::".__FILE__.":$_SERVER[SERVER_NAME]:80"); } /* makes string of random letters for embedding into image and for encoding as hash, later verification */ public static function mkpass () { $s = ""; for ($n=0; $n<10; $n++) { $s .= chr(rand(0, 255)); } $s = base64_encode($s); // base64-set, but filter out unwanted chars $s = preg_replace("/[+\/=IG0ODQR]/i", "", $s); // (depends on YOUR font) $s = substr ($s, 0, rand(5,7)); return($s); } } #-- IE workaround if (isset($_REQUEST['_tcf'])) { captcha::get_image($_REQUEST['_tcf']); } ?>
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