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Mark simple and moderate captchas as deprecated.

Browse Source 
Change extreme captcha to use random colours, instead of fixed ones.
Change it to have lines to every character: the characters in the solution
are now connected by dotted lines; characters not in the solution are
connected by solid lines. Replace dots with polygons.

Add new captchas with a TrueType font. The solution is obscured by small
characters or by rectangles, ellipses, slices of ellipses, and polygons.
These shapes are either filled or outlined.

Fixes #13
This commit is contained in:
Daniel Winzen
2025-08-30 19:30:03 +02:00
parent 5bbbfd7235
commit 038b808313
1 changed files with 199 additions and 27 deletions
Download Patch File Download Diff File Expand all files Collapse all files

226
chat.php
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@@ -362,6 +362,7 @@ function route_setup(): void
$C['text_settings']=[
'dateformat' => _('<a target="_blank" href="https://php.net/manual/en/function.date.php#refsect1-function.date-parameters" rel="noopener noreferrer">Date formating</a>'),
'captchachars' => _('Characters used in Captcha'),
'captchattfont' => _('Font name or path and filename for TrueType font used in some captchas'),
'redirect' => _('Custom redirection script'),
'chatname' => _('Chat name'),
'mailsender' => _('Send mail using this address'),
@@ -648,6 +649,11 @@ function send_captcha(): void
if($difficulty===0 || !extension_loaded('gd')){
return;
}
if(function_exists('putenv')) {
// from https://www.php.net/manual/en/function.imagefttext.php
// enables fonts to be loaded from the directory the script is in
putenv('GDFONTPATH=' . realpath('.'));
}
$captchachars=get_setting('captchachars');
$length=strlen($captchachars)-1;
$code='';
@@ -662,7 +668,14 @@ function send_captcha(): void
$stmt=$db->prepare('INSERT INTO ' . PREFIX . 'captcha (id, time, code) VALUES (?, ?, ?);');
$stmt->execute([$randid, $time, $code]);
}
echo '<tr id="captcha"><td>'._('Copy:').'<br>';
echo '<tr id="captcha"><td>';
if ($difficulty===4) {
echo _('Type the characters connected by dotted lines:');
} elseif ($difficulty===7 || $difficulty===8) {
echo _('Type the five largest characters:');
} else {
echo _('Type the characters in the image:');
}
if($difficulty===1){
$im=imagecreatetruecolor(55, 24);
$bg=imagecolorallocate($im, 0, 0, 0);
@@ -685,7 +698,7 @@ function send_captcha(): void
imagesetpixel($im, mt_rand(0, 55), mt_rand(0, 24), $dots);
}
echo '<img alt="" width="55" height="24" src="data:image/gif;base64,';
}elseif($difficulty===3){
}elseif($difficulty===3){ // hard
$im=imagecreatetruecolor(55, 24);
$bg=imagecolorallocatealpha($im, 0, 0, 0, 127);
$fg=imagecolorallocate($im, 255, 255, 255);
@@ -724,18 +737,38 @@ function send_captcha(): void
}
imagedestroy($char);
echo '<img width="120" height="80" src="data:image/png;base64,';
}else{
$im=imagecreatetruecolor(150, 200);
$bg=imagecolorallocate($im, 0, 0, 0);
$fg=imagecolorallocate($im, 255, 255, 255);
}elseif($difficulty===4){ // extreme
$CAPTCHAWIDTH = 300;
$CAPTCHAHEIGHT = 300;
$im=imagecreatetruecolor($CAPTCHAWIDTH, $CAPTCHAHEIGHT);
$bg=imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
$fg=imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
imagefill($im, 0, 0, $bg);
imagelayereffect($im,IMG_EFFECT_NORMAL);
$fontwidth = imagefontwidth(5); // 9 pixels wide
$fontheight = imagefontheight(5); // 10 pixels high
for($i=0; $i<20; ++$i){
$leftx = mt_rand(0, $CAPTCHAWIDTH - $fontwidth);
$topy = mt_rand(0, $CAPTCHAHEIGHT - $fontheight);
for($j=0; $j<($numpoints * 2); $j+=2){
$points[$j]=$leftx + mt_rand(0, $fontwidth);
$points[$j+1]=$topy + mt_rand(0, $fontheight);
}
$numpoints=(int) mt_rand(3,6);
for($k=0; $k<($numpoints * 2); $k+=2){
$points[$k]=mt_rand(0, $CAPTCHAWIDTH);
$points[$k+1]=mt_rand(0, $CAPTCHAHEIGHT);
}
imagefilledpolygon( $im, $points, $numpoints, imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255)));
}
$chars=[];
$x = $y = 0;
for($i=0;$i<10;++$i){
imagelayereffect($im,IMG_EFFECT_NORMAL);
for($i=0; $i<20; ++$i){
$found=false;
while(!$found){
$x=mt_rand(10, 140);
$y=mt_rand(10, 180);
$x=mt_rand(0, $CAPTCHAWIDTH - $fontwidth);
$y=mt_rand(0, $CAPTCHAHEIGHT - $fontheight);
$found=true;
foreach($chars as $char){
if($char['x']>=$x && ($char['x']-$x)<25){
@@ -757,32 +790,147 @@ function send_captcha(): void
$chars[]=['x', 'y'];
$chars[$i]['x']=$x;
$chars[$i]['y']=$y;
if($i<5){
imagelayereffect($im, IMG_EFFECT_OVERLAY);
$fg = imagecolorallocate($im, 255, 255, 255);
if($i<5){ // characters in solution
imagechar($im, 5, $chars[$i]['x'], $chars[$i]['y'], $code[$i], $fg);
}else{ // spurious characters
imagechar($im, 5, $chars[$i]['x'], $chars[$i]['y'], $captchachars[mt_rand(0, $length)], $fg);
}else{
imagechar($im, 5, $chars[$i]['x'], $chars[$i]['y'], $code[$i-5], $fg);
}
}
$follow=imagecolorallocate($im, 200, 0, 0);
imagearc($im, $chars[5]['x']+4, $chars[5]['y']+8, 16, 16, 0, 360, $follow);
for($i=5;$i<9;++$i){
imageline($im, $chars[$i]['x']+4, $chars[$i]['y']+8, $chars[$i+1]['x']+4, $chars[$i+1]['y']+8, $follow);
imagelayereffect($im, IMG_EFFECT_OVERLAY);
for($i=5; $i<19; ++$i){ // solid lines between spurious characters
imageline($im, $chars[$i]['x'] + $fontwidth / 2, $chars[$i]['y'] + $fontheight / 2, $chars[$i + 1]['x'] + $fontwidth / 2, $chars[$i + 1]['y'] + $fontheight / 2, imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255)));
}
$line=imagecolorallocate($im, 255, 255, 255);
for($i=0;$i<5;++$i){
imageline($im, 0, mt_rand(0, 200), 150, mt_rand(0, 200), $line);
// dashed lines between characters in solution
imagelayereffect($im,IMG_EFFECT_OVERLAY);
for($i=0; $i<4; ++$i){
$dottedlinecolor = imagecolorallocate($im, 255, 255, 255);
$dottedlinestyle = array($dottedlinecolor, $dottedlinecolor, $dottedlinecolor, IMG_COLOR_TRANSPARENT, IMG_COLOR_TRANSPARENT, IMG_COLOR_TRANSPARENT);
imagesetstyle($im, $dottedlinestyle);
$follow=imagecolorallocate($im, mt_rand(10, 255), mt_rand(10, 255), mt_rand(10, 255));
imageline($im, $chars[$i]['x']+ $fontwidth / 2, $chars[$i]['y']+ $fontheight / 2, $chars[$i+1]['x']+4, $chars[$i+1]['y']+8, IMG_COLOR_STYLED);
}
$dots=imagecolorallocate($im, 255, 255, 255);
for($i=0;$i<1000;++$i){
imagesetpixel($im, mt_rand(0, 150), mt_rand(0, 200), $dots);
echo '<img alt="CAPTCHA" width="' . $CAPTCHAWIDTH . '" height="' . $CAPTCHAHEIGHT . '" src="data:image/gif;base64,';
} elseif ($difficulty===5 || $difficulty===6 || $difficulty===7 || $difficulty===8){ // TrueType
$CAPTCHAWIDTH = 620;
$CAPTCHAHEIGHT = 177;
$im = imagecreatetruecolor($CAPTCHAWIDTH, $CAPTCHAHEIGHT);
if ($difficulty===5 || $difficulty===6) {
imagelayereffect($im,IMG_EFFECT_MULTIPLY);
} else {
imagelayereffect($im,IMG_EFFECT_OVERLAY);
}
echo '<img alt="" width="150" height="200" src="data:image/gif;base64,';
if ($difficulty===8){
imagefill($im, 0, 0, imagecolorallocate($im, 0, 0, 0));
} else {
imagefill($im, 0, 0, imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255)));
}
if ($difficulty===7 || $difficulty===8){
for($i=0; $i<50; ++$i){ // small spurious characters
if ($difficulty===7) {
$color = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
} else {
$lightness = mt_rand(127, 255);
$color = imagecolorallocate($im, $lightness, $lightness, $lightness);
}
$charsize = mt_rand($CAPTCHAHEIGHT * 0.18 , $CAPTCHAHEIGHT * 0.25);
imagefttext($im, $charsize, mt_rand(0, 90) - 45, mt_rand(0, $CAPTCHAWIDTH), mt_rand(0, $CAPTCHAHEIGHT), $color, get_setting('captchattfont'), $captchachars[mt_rand(0, strlen($captchachars)-1)]);
}
}
// characters in solution
for($i=0; $i<5; ++$i){
if ($difficulty===7) {
$color = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
} else {
$lightness = mt_rand(127, 255);
$color = imagecolorallocate($im, $lightness, $lightness, $lightness);
}
$charsize = mt_rand($CAPTCHAHEIGHT * 0.5 , $CAPTCHAHEIGHT * 0.7);
imagefttext($im, $charsize, mt_rand(0, 90) - 45, ($CAPTCHAWIDTH / 8 * ($i * 1.5 + 0.5)), $CAPTCHAHEIGHT - $charsize / 2, $color, get_setting('captchattfont'), $code[$i-5]);
}
if ($difficulty===7 || $difficulty===8){
for($i=0; $i<50; ++$i){ // more small spurious characters
if ($difficulty===7) {
$color = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
} else { // monochrome
$lightness = mt_rand(127, 255);
$color = imagecolorallocate($im, $lightness, $lightness, $lightness);
}
$charsize = mt_rand($CAPTCHAHEIGHT * 0.18 , $CAPTCHAHEIGHT * 0.25);
imagefttext($im, $charsize, mt_rand(0, 90) - 45, mt_rand(0, $CAPTCHAWIDTH), mt_rand(0, $CAPTCHAHEIGHT), $color, get_setting('captchattfont'), $captchachars[mt_rand(0, strlen($captchachars)-1)]);
}
}
if ($difficulty===5 || $difficulty===6){
if ($difficulty===6) {
$iterations = 10; // hollow
} else {
$iterations = 1; // solid
}
for($i=0; $i<$iterations; ++$i){ // apply layers of hollow or solid shapes
for($j=0; $j<5; ++$j){
$width = mt_rand(1, $CAPTCHAWIDTH / 5 - 1);
$height = mt_rand(1, $CAPTCHAHEIGHT - 1);
$center_x = $j * $CAPTCHAWIDTH / 5 + mt_rand(0, $CAPTCHAWIDTH / 5 - $width / 2);
$center_y = $height / 2 + mt_rand(0, $CAPTCHAHEIGHT - $height);
if ($difficulty===6){
imagelayereffect($im,IMG_EFFECT_OVERLAY);
imageellipse( $im, $center_x, $center_y, $width, $height, imagecolorallocate($im, mt_rand(127, 255), mt_rand(127, 255), mt_rand(127, 255)));
imagelayereffect($im,IMG_EFFECT_MULTIPLY);
imageellipse( $im, $center_x, $center_y, $width, $height, imagecolorallocate($im, mt_rand(127, 255), mt_rand(127, 255), mt_rand(127, 255)));
} else {
imagefilledellipse( $im, $center_x, $center_y, $width, $height, imagecolorallocate($im, mt_rand(127, 255), mt_rand(127, 255), mt_rand(127, 255)));
}
}
for($j=0; $j<5; ++$j){
$width = mt_rand(1, $CAPTCHAWIDTH / 5 - 1);
$height = mt_rand(1, $CAPTCHAHEIGHT - 1);
$center_x = $j * $CAPTCHAWIDTH / 5 + $width / 2 + mt_rand(0, $CAPTCHAWIDTH / 5 - $width / 2);
$center_y = $height / 2 + mt_rand(0, $CAPTCHAHEIGHT - $height);
if ($difficulty===6){
// https://www.php.net/manual/en/function.imagearc.php
imagelayereffect($im,IMG_EFFECT_OVERLAY);
imagearc($im, $center_x, $center_y, $width, $height, mt_rand(0, 360), mt_rand(0, 360), imagecolorallocate($im, mt_rand(127, 255), mt_rand(127, 255), mt_rand(127, 255)));
imagelayereffect($im,IMG_EFFECT_MULTIPLY);
imagearc($im, $center_x, $center_y, $width, $height, mt_rand(0, 360), mt_rand(0, 360), imagecolorallocate($im, mt_rand(127, 255), mt_rand(127, 255), mt_rand(127, 255)));
} else {
imagefilledarc($im, $center_x, $center_y, $width, $height, mt_rand(0, 360), mt_rand(0, 360), imagecolorallocate($im, mt_rand(127, 255), mt_rand(127, 255), mt_rand(127, 255)), IMG_ARC_PIE);
}
}
for($j=0; $j<5; ++$j){
$numpoints=(int) mt_rand(3,6);
for($k=0; $k<($numpoints * 2); $k+=2){
$points[$k] = mt_rand($j * $CAPTCHAWIDTH / 5, ($j + 1) * $CAPTCHAWIDTH / 5);
$points[$k+1] = mt_rand(0, $CAPTCHAHEIGHT);
}
if ($difficulty===6){
imagelayereffect($im,IMG_EFFECT_OVERLAY);
imagepolygon( $im, $points, $numpoints, imagecolorallocate($im, mt_rand(127, 255), mt_rand(127, 255), mt_rand(127, 255)));
imagelayereffect($im,IMG_EFFECT_MULTIPLY);
imagepolygon( $im, $points, $numpoints, imagecolorallocate($im, mt_rand(127, 255), mt_rand(127, 255), mt_rand(127, 255)));
} else {
imagefilledpolygon( $im, $points, $numpoints, imagecolorallocate($im, mt_rand(127, 255), mt_rand(127, 255), mt_rand(127, 255)));
}
}
for($j=0; $j<5; $j++){
if ($difficulty===6){
imagelayereffect($im,IMG_EFFECT_OVERLAY);
imagerectangle($im, mt_rand($j * $CAPTCHAWIDTH / 5, ($j + 1) * $CAPTCHAWIDTH / 5), mt_rand(0, $CAPTCHAHEIGHT), mt_rand($j * $CAPTCHAWIDTH / 5, ($j + 1) * $CAPTCHAWIDTH / 5), mt_rand(0, $CAPTCHAHEIGHT), imagecolorallocate($im, mt_rand(127, 255), mt_rand(127, 255), mt_rand(127, 255)));
imagelayereffect($im,IMG_EFFECT_MULTIPLY);
imagerectangle($im, mt_rand($j * $CAPTCHAWIDTH / 5, ($j + 1) * $CAPTCHAWIDTH / 5), mt_rand(0, $CAPTCHAHEIGHT), mt_rand($j * $CAPTCHAWIDTH / 5, ($j + 1) * $CAPTCHAWIDTH / 5), mt_rand(0, $CAPTCHAHEIGHT), imagecolorallocate($im, mt_rand(127, 255), mt_rand(127, 255), mt_rand(127, 255)));
} else {
imagefilledrectangle($im, mt_rand($j * $CAPTCHAWIDTH / 5, ($j + 1) * $CAPTCHAWIDTH / 5), mt_rand(0, $CAPTCHAHEIGHT), mt_rand($j * $CAPTCHAWIDTH / 5, ($j + 1) * $CAPTCHAWIDTH / 5), mt_rand(0, $CAPTCHAHEIGHT), imagecolorallocate($im, mt_rand(127, 255), mt_rand(127, 255), mt_rand(127, 255)));
}
}
}
}
echo '<img alt="" width="' . $CAPTCHAWIDTH . '" height="' .$CAPTCHAHEIGHT . '" src="data:image/gif;base64,';
}
ob_start();
imagegif($im);
imagedestroy($im);
echo base64_encode(ob_get_clean()).'">';
echo '</td><td>'.hidden('challenge', $randid).'<input type="text" name="captcha" size="15" autocomplete="off" required></td></tr>';
echo '</td></tr><tr><td>'.hidden('challenge', $randid).'<input type="text" name="captcha" size="15" autocomplete="off" required></td></tr>';
}
function send_setup(array $C): void
@@ -912,12 +1060,12 @@ function send_setup(array $C): void
if($captcha===1){
echo ' selected';
}
echo '>'._('Simple').'</option>';
echo '>'._('Simple (deprecated)').'</option>';
echo '<option value="2"';
if($captcha===2){
echo ' selected';
}
echo '>'._('Moderate').'</option>';
echo '>'._('Moderate (deprecated)').'</option>';
echo '<option value="3"';
if($captcha===3){
echo ' selected';
@@ -928,6 +1076,26 @@ function send_setup(array $C): void
echo ' selected';
}
echo '>'._('Extreme').'</option>';
echo '<option value="5"';
if($captcha===5){
echo ' selected';
}
echo '>'._('TrueType with solid shapes').'</option>';
echo '<option value="6"';
if($captcha===6){
echo ' selected';
}
echo '>'._('TrueType with hollow shapes').'</option>';
echo '<option value="7"';
if($captcha===7){
echo ' selected';
}
echo '>'._('TrueType with spurious characters').'</option>';
echo '<option value="8"';
if($captcha===8){
echo ' selected';
}
echo '>'._('TrueType with spurious characters, monochrome').'</option>';
echo '</select></td></tr>';
}
echo '</table></td></tr></table></td></tr>';
@@ -4256,6 +4424,7 @@ function init_chat(): void
['messageexpire', '14400'],
['messagelimit', '150'],
['maxmessage', 2000],
['captchattfont', '/usr/share/fonts/truetype/dejavu/DejaVuSansMono.ttf'],
['captchatime', '600'],
['colbg', '000000'],
['coltxt', 'FFFFFF'],
@@ -4707,6 +4876,9 @@ function update_db(): void
$db->exec('INSERT INTO ' . PREFIX . "settings (setting, value) VALUES ('exitwait', '180'), ('exitingtxt', ' &#128682;"); // door emoji
$db->exec('ALTER TABLE ' . PREFIX . 'sessions ADD COLUMN exiting smallint NOT NULL DEFAULT 0;');
}
if($dbversion<49){
$db->exec('INSERT INTO ' . PREFIX . "settings (setting, value) VALUES ('captchattfont', '/usr/share/fonts/truetype/dejavu/DejaVuSansMono.ttf');");
}
update_setting('dbversion', DBVERSION);
if($msgencrypted!==MSGENCRYPTED){
if(!extension_loaded('sodium')){
@@ -4909,7 +5081,7 @@ function load_lang(): void
function load_config(): void
{
define('VERSION', '1.24.1'); // Script version
define('DBVERSION', 48); // Database layout version
define('DBVERSION', 49); // Database layout version
define('MSGENCRYPTED', false); // Store messages encrypted in the database to prevent other database users from reading them - true/false - visit the setup page after editing!
define('ENCRYPTKEY_PASS', 'MY_SECRET_KEY'); // Recommended length: 32. Encryption key for messages
define('AES_IV_PASS', '012345678912'); // Recommended length: 12. AES Encryption IV