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<?php
// Copyright (C) 2015 Remy van Elst
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
function tls_fallback_scsv($host, $ip, $port) {
global $timeout;
// OpenSSL 1.1.0 has ipv6 support: https://rt.openssl.org/Ticket/Display.html?id=1832
// if (filter_var(preg_replace('/[^A-Za-z0-9\.\:_-]/', '', $ip), FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
// // ipv6 openssl tools are broken. (https://rt.openssl.org/Ticket/Display.html?id=1365&user=guest&pass=guest)
// return false;
// }
$result = [];
$protocols = ssl_conn_protocols($host, $ip, $port);
if (count(array_filter($protocols)) > 1) {
$result['protocol_count'] = count(array_filter($protocols));
// OpenSSL 1.1.0 has ipv6 support: https://rt.openssl.org/Ticket/Display.html?id=1832
if (filter_var(preg_replace('/[^A-Za-z0-9\.\:_-]/', '', $ip), FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
$fallback_test = shell_exec("echo | timeout $timeout openssl s_client -servername \"" . escapeshellcmd($host) . "\" -connect '" . $ip . ":" . escapeshellcmd($port) . "' -fallback_scsv -no_tls1_2 2>&1 >/dev/null");
} else {
$fallback_test = shell_exec("echo | timeout $timeout openssl s_client -servername \"" . escapeshellcmd($host) . "\" -connect " . escapeshellcmd($ip) . ":" . escapeshellcmd($port) . " -fallback_scsv -no_tls1_2 2>&1 >/dev/null");
}
if ( stripos($fallback_test, "SSL alert number 86") !== false ) {
$result['tls_fallback_scsv_support'] = 1;
}
} else {
$result['protocol_count'] = 1;
}
return $result;
}
?>
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