tilde-oauth/secret/rsa.php

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2023-10-02 00:29:59 +00:00
<?php
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function getPassphrase() {
$passphrase = trim(shell_exec("/usr/bin/hostname")).trim(shell_exec("/usr/bin/cat /sys/class/net/*/address"));
return $passphrase;
}
function ensureKey() {
if (file_exists("/var/www/usergen/secret/private.key") && file_exists("/var/www/usergen/secret/public.key")) {
return;
}
$passphrase = getPassphrase();
$config = array(
"digest_alg" => "sha256",
"private_key_bits" => 4096,
"private_key_type" => OPENSSL_KEYTYPE_RSA,
"encrypt_key" => true,
"encrypt_key_cipher" => OPENSSL_CIPHER_AES_256_CBC
);
$res = openssl_pkey_new($config);
openssl_pkey_export($res, $privkey, $passphrase);
$oldMask = umask(0007);
file_put_contents("/var/www/usergen/secret/private.key", $privkey);
$pubkey = openssl_pkey_get_details($res);
umask($oldMask);
file_put_contents("/var/www/usergen/secret/public.key", $pubkey["key"]);
}
function getPublic() {
ensureKey();
$public = file_get_contents("/var/www/usergen/secret/public.key");
return $public;
}
function getFingerprint() {
ensureKey();
$fingerprint = shell_exec("/usr/bin/openssl pkey -pubin -in /var/www/usergen/secret/public.key -outform DER | /usr/bin/openssl dgst -sha256 -c | /usr/bin/sed -e 's/^.* //' | /usr/bin/sed -e 's/://g'");
return $fingerprint;
}
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// Object -> JSON -> Base84 -> Split -> Encrypt -> Combined -> re-base64 -> Sent
function encryptPayload($input){
$holdingArray = str_split(base64_encode($input), 64);
$holdingArray = array_map(function($value){
return encrypt($value);
}, $holdingArray);
$holdingArray = implode("%", $holdingArray);
return $holdingArray;
}
function decryptPayload($input){
$holdingArray = explode("%", $input);
$holdingArray = array_map(function($value){
return decrypt($value);
}, $holdingArray);
$holdingArray = implode("", $holdingArray);
return base64_decode($holdingArray);
}
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function encrypt($input){
// Encrypt with public key
ensureKey();
$public = getPublic();
$public = openssl_get_publickey($public);
openssl_public_encrypt($input, $encrypted, $public);
return base64_encode($encrypted);
}
function decrypt($input){
// Decrypt with private key
ensureKey();
openssl_private_decrypt(
base64_decode($input),
$decrypted,
openssl_get_privatekey(
file_get_contents("/var/www/usergen/secret/private.key"),
getPassphrase()
)
);
return $decrypted;
}
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function buildEncToken($AuthToken, $UserID, $UserIP, $UserAgent ){
// Token Data:
// - HTown AuthToken
// - UserID
// - UserIP
// - UserAgent
// - Timestamp
$TokenData = array(
"AuthToken" => $AuthToken,
"UserID" => $UserID,
"UserIP" => $UserIP,
"UserAgent" => $UserAgent,
"Timestamp" => time() // Unix Time in Seconds
);
$TokenData = json_encode($TokenData);
$EncTokenData = encryptPayload($TokenData);
return $EncTokenData;
}
function verifyEncToken($EncTokenData){
$TokenData = decryptPayload($EncTokenData);
$TokenData = json_decode($TokenData);
if ($TokenData != null && isset($TokenData->AuthToken) && isset($TokenData->UserID) && isset($TokenData->UserIP) && isset($TokenData->UserAgent) && isset($TokenData->Timestamp)) {
// Valid Token
if (time() - $TokenData->Timestamp > 900) { // 15-minute max login session
// Token Expired
return "Login Expired";
}
if ($TokenData->UserIP != $_SERVER["REMOTE_ADDR"]) {
// IP Mismatch
return "IP Mismatch";
}
if ($TokenData->UserAgent != $_SERVER["HTTP_USER_AGENT"]) {
// User Agent Mismatch
return "UserAgent Mismatch";
}
$credentialResults = verifyCredentials($TokenData->AuthToken);
if (gettype($credentialResults) == "string") {
// Invalid AuthToken
return "Invalid Mastodon Account";
}
return array(
"AuthToken" => $TokenData->AuthToken,
"UserID" => $TokenData->UserID,
"MastodonData" => $credentialResults
);
}else{
// Invalid Token
return "Invalid Token";
}
}
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?>