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Smarter preventing all POST CSRF

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myvesta 2021-08-29 00:04:27 +02:00 • committed by GitHub
commit c7bd10ab3b
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1 changed files with 22 additions and 3 deletions
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25
web/inc/secure_login.php
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@ -50,15 +50,34 @@ if ($secure_gate_check==true) {
}
}
// Preventing all CSRF
if ($secure_gate_check==true) {
function prevent_post_csrf ($hard_check=false) {
if (file_exists('/usr/local/vesta/conf_web/dont_check_csrf')) return;
if ($_SERVER['REQUEST_METHOD']=='POST') {
if ($hard_check==false) {
if (isset($_SERVER['HTTP_HOST']) == false) return;
if (isset($_SERVER['HTTP_ORIGIN']) == false) return;
if (isset($_SERVER['SERVER_PORT']) == false) return;
} else {
if (isset($_SERVER['HTTP_HOST']) == false) $_SERVER['HTTP_HOST']='';
if (isset($_SERVER['HTTP_ORIGIN']) == false) $_SERVER['HTTP_ORIGIN']='';
if (isset($_SERVER['SERVER_PORT']) == false) $_SERVER['HTTP_PORT']='';
}
$_SERVER['HTTP_HOST']=strtolower($_SERVER['HTTP_HOST']);
$_SERVER['HTTP_ORIGIN']=strtolower($_SERVER['HTTP_ORIGIN']);
if ($hard_check==false) {
if (substr($_SERVER['HTTP_ORIGIN'], 0,7) != "http://" && substr($_SERVER['HTTP_ORIGIN'], 0,8)!="https://") return;
}
$host_arr=explode(":", $_SERVER['HTTP_HOST']);
$hostname=$host_arr[0];
$port = $_SERVER['SERVER_PORT'];
$expected_http_origin="https://".$hostname.":".$port;
$level=1;
if ($hard_check==true) $level=2;
if ($_SERVER['HTTP_ORIGIN'] != $expected_http_origin) {
die ("Nope.");
die ("CSRF detected (".$level.").<br />Your browser sent HTTP_ORIGIN with value: <b>".$_SERVER['HTTP_ORIGIN']."</b><br />myVesta expected HTTP_ORIGIN with value: <b>".$expected_http_origin."</b><br />Probably some browser extension is blocking it... disable all extensions and try again (or try to login with other browser).<br />If you are system administrator of this server, you can disable CSRF check by doing (as root, in SSH): <b>mkdir /usr/local/vesta/conf_web && touch /usr/local/vesta/conf_web/dont_check_csrf</b><br >(but we don't recommend it)<br />If you are not system administrator of this server and you can't access the hosting panel even you disabled all browser extensions, please copy-paste this message to the system administrator of this server.<br />Once again, before you disable CSRF check, try to disable all browser extensions or try to login with other browser.");
}
}
}
// Preventing all POST CSRF
if ($secure_gate_check==true) prevent_post_csrf();