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mta-sts.txt working with and without reverse proxy #7080

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mta-sts.txt working with and without reverse proxy #7080

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4ef65fc
Merge pull request #6948 from mailcow/staging
DerLinkman Dec 9, 2025
c11ed5d
Prevent duplicate/plaintext login announcement rendering (#6963)
Copilot Dec 12, 2025
e76f523
ofelia: revert fixed cron syntax for sa-rules download
DerLinkman Dec 11, 2025
d977ddb
backup: add image prefetch function to verify latest image is used
DerLinkman Dec 10, 2025
e8d9315
Merge pull request #6905 from Ashitaka57/6646-pbkdf2-sha512-verify-hash
Ashitaka57 Dec 10, 2025
4ccfedd
Merge pull request #7024 from mailcow/staging
FreddleSpl0it Jan 29, 2026
4845928
Merge pull request #7027 from mailcow/staging
FreddleSpl0it Jan 29, 2026
0fa5027
Refactor host retrieval in mta-sts.php
monster010 Feb 24, 2026
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15 changes: 13 additions & 2 deletions data/web/mta-sts.php
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Original file line number Diff line number Diff line change
@@ -1,12 +1,23 @@
<?php
require_once $_SERVER['DOCUMENT_ROOT'] . '/inc/prerequisites.inc.php';

if (!isset($_SERVER['HTTP_HOST']) || strpos($_SERVER['HTTP_HOST'], 'mta-sts.') !== 0) {
function get_requested_host(): string|false {
if(!isset($_SERVER['HTTP_X_FORWARDED_HOST']) && !empty($_SERVER['HTTP_X_FORWARDED_HOST'])) {
$xfh = explode(',', $_SERVER['HTTP_X_FORWARDED_HOST'])[0];
return trim($xfh);
}

return $_SERVER['HTTP_HOST'] ?? false;
}

$server_host = get_requested_host();

if ($server_host === false || strpos($server_host, 'mta-sts.') !== 0) {
http_response_code(404);
exit;
}

$host = preg_replace('/:[0-9]+$/', '', $_SERVER['HTTP_HOST']);
$host = preg_replace('/:[0-9]+$/', '', $server_host);
$domain = idn_to_ascii(strtolower(str_replace('mta-sts.', '', $host)), 0, INTL_IDNA_VARIANT_UTS46);

// Validate domain or return 404 on error
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