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<?php
function isJson($string): bool {
json_decode($string);
return (json_last_error() == JSON_ERROR_NONE);
}
function pkcs7_unpad($data) {
return substr($data, 0, -ord($data[strlen($data) - 1]));
}
function timeAgo($time): string {
if (!is_numeric($time)) {
$time = strtotime($time);
}
$periods = ["second", "minute", "hour", "day", "week", "month", "year", "age"];
$lengths = array("60", "60", "24", "7", "4.35", "12", "100");
$now = time();
$difference = $now - $time;
if ($difference <= 10 && $difference >= 0) {
return $tense = "now";
} elseif ($difference > 0) {
$tense = "ago";
} else {
$tense = "later";
}
for ($j = 0; $difference >= $lengths[$j] && $j < count($lengths)-1; $j++) {
$difference /= $lengths[$j];
}
$difference = round($difference);
$period = $periods[$j] . ($difference >1 ? "s" :'');
return "{$difference} {$period} {$tense}";
}
if (!isset($_SERVER['argv'][1]) || !isset($_SERVER['argv'][2])) {
echo("Usage: php " . $_SERVER['argv'][0] . " <file> <key>\n");
die();
} else {
$file = @file_get_contents($_SERVER['argv'][1]);
$raw = @file_get_contents($_SERVER['argv'][2]);
if ($file === false) {
echo("Unable to open backup file\n");
die();
}
if ($raw === false) {
echo("Unable to open key file\n");
die();
}
$raw2 = base64_decode($raw);
if (!isJson($raw2)) {
echo("Key file is corrupt\n");
die();
}
$keydata = json_decode($raw2, true);
if (!is_array($keydata) || !isset($keydata["iv"]) || !isset($keydata["key"])) {
echo("Key file is invalid\n");
die();
}
$iv = hex2bin($keydata["iv"]);
$key = hex2bin($keydata["key"]);
$decrypted = openssl_decrypt($file, 'AES-256-CBC', $key, OPENSSL_RAW_DATA, $iv);
if ($decrypted === false) {
echo("Unable to decrypt backup\n");
die();
}
$unpadded = pkcs7_unpad($decrypted);
if (!is_string($unpadded)) {
echo("Unable to decrypt backup\n");
die();
}
if (!isJson($unpadded)) {
echo("Backup is corrupt\n");
die();
}
$data = json_decode($unpadded, true);
if (!is_array($data) || !isset($data["date"]) || !isset($data["files"])) {
echo("Backup is invalid\n");
die();
}
echo(realpath($_SERVER['argv'][1]) . "\n Key: " . $_SERVER['argv'][2] . "\n Date: " . date('r', strtotime($data["date"])) . " (" . timeAgo($data["date"]) . ")" . "\n Contents: " . count($data["files"]) . " files\n");
@mkdir("./_restored");
$index = 0;
foreach ($data["files"] as $file) {
if ($file["dir"] === "") {
print("[$index] /" . $file["file"] . "\n");
} else {
print("[$index] /" . $file["dir"] . "/" . $file["file"] . "\n");
}
$content = base64_decode($file["content"]);
if (sha1($content) !== $file["checksum"][0]) {
print(" Backed up file is corrupted (SHA1 mismatch)\n Expected: " . $file["checksum"][0] . "\n Got: " . sha1($content) . "\n");
die("Backup aborted.\n");
}
if (md5($content) !== $file["checksum"][1]) {
print(" Backed up file is corrupted (MD5 mismatch)\n Expected: " . $file["checksum"][1] . "\n Got: " . md5($content) . "\n");
die("Backup aborted.\n");
}
@mkdir("./_restored/" . $file["dir"], 0777, true);
file_put_contents("./_restored/" . $file["dir"] . "/" . $file["file"], $content);
$index++;
}
print("Restored backup to ./_restored; review files before restoring to production\n");
}
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