This file is indexed.

/usr/sbin/ykval-synchronize is in yubikey-val 2.38-2.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/usr/bin/php
<?php

# Copyright (c) 2010-2015 Yubico AB
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
#   * Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer.
#
#   * Redistributions in binary form must reproduce the above
#     copyright notice, this list of conditions and the following
#     disclaimer in the documentation and/or other materials provided
#     with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

if($argc != 3 || !( $argv[2] == 'all' || preg_match('/^[cbdefghijklnrtuv]{0,16}$/', $argv[2]))) {
  echo "Usage: ".$argv[0]." URL KEY\n\n";
  echo "URL: URL of resync service.\n\n";
  echo "KEY: Public identifier of a YubiKey to sync, or \"all\".\n\n";
  echo "Usage example:\n\n";
  echo $argv[0]." http://example.com/wsapi/2.0/resync ccccccccccdn\n";
  exit(1);
}

$host = $argv[1];
$yk = $argv[2];

if(!preg_match('~^https?://~', $host)) {
  #Allow just an IP or host
  if(strpos($host, "/") == False) {
    $host = $host."/wsapi/2.0/resync";
  }
  $host = "http://".$host;
}

$url = $host."?yk=".$yk;

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_USERAGENT, "YK-VAL");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_FAILONERROR, true);

$response = curl_exec($ch);
if($response == False) {
  die("error");
}

echo $response;

curl_close($ch);