mirror of
https://github.com/moonlight-stream/moonlight-android.git
synced 2025-07-23 21:12:44 +00:00
266 lines
10 KiB
Java
266 lines
10 KiB
Java
package com.limelight.nvstream.http;
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import javax.crypto.BadPaddingException;
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import javax.crypto.Cipher;
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import javax.crypto.IllegalBlockSizeException;
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import javax.crypto.NoSuchPaddingException;
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import javax.crypto.SecretKey;
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import javax.crypto.ShortBufferException;
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import javax.crypto.spec.SecretKeySpec;
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import org.xmlpull.v1.XmlPullParserException;
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import java.security.cert.Certificate;
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import java.security.cert.CertificateException;
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import java.io.*;
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import java.net.MalformedURLException;
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import java.security.*;
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import java.security.cert.*;
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import java.util.Arrays;
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import java.util.Locale;
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import java.util.Random;
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public class PairingManager {
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private NvHTTP http;
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private PrivateKey pk;
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private X509Certificate cert;
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private SecretKey aesKey;
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private byte[] pemCertBytes;
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public enum PairState {
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NOT_PAIRED,
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PAIRED,
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PIN_WRONG,
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FAILED
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}
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public PairingManager(NvHTTP http, LimelightCryptoProvider cryptoProvider) {
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this.http = http;
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this.cert = cryptoProvider.getClientCertificate();
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this.pemCertBytes = cryptoProvider.getPemEncodedClientCertificate();
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this.pk = cryptoProvider.getClientPrivateKey();
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}
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final private static char[] hexArray = "0123456789ABCDEF".toCharArray();
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private static String bytesToHex(byte[] bytes) {
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char[] hexChars = new char[bytes.length * 2];
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for ( int j = 0; j < bytes.length; j++ ) {
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int v = bytes[j] & 0xFF;
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hexChars[j * 2] = hexArray[v >>> 4];
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hexChars[j * 2 + 1] = hexArray[v & 0x0F];
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}
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return new String(hexChars);
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}
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private static byte[] hexToBytes(String s) {
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int len = s.length();
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byte[] data = new byte[len / 2];
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for (int i = 0; i < len; i += 2) {
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data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
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+ Character.digit(s.charAt(i+1), 16));
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}
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return data;
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}
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private X509Certificate extractPlainCert(String text) throws XmlPullParserException, IOException, CertificateException
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{
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String certText = NvHTTP.getXmlString(text, "plaincert");
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byte[] certBytes = hexToBytes(certText);
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CertificateFactory cf = CertificateFactory.getInstance("X.509");
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return (X509Certificate)cf.generateCertificate(new ByteArrayInputStream(certBytes));
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}
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private byte[] generateRandomBytes(int length)
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{
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byte[] rand = new byte[length];
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new SecureRandom().nextBytes(rand);
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return rand;
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}
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private static byte[] saltPin(byte[] salt, String pin) throws UnsupportedEncodingException {
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byte[] saltedPin = new byte[salt.length + pin.length()];
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System.arraycopy(salt, 0, saltedPin, 0, salt.length);
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System.arraycopy(pin.getBytes("UTF-8"), 0, saltedPin, salt.length, pin.length());
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return saltedPin;
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}
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private static byte[] toSHA1Bytes(byte[] data) {
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try {
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MessageDigest md = MessageDigest.getInstance("SHA-1");
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return md.digest(data);
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}
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catch (NoSuchAlgorithmException e) {
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// Shouldn't ever happen
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e.printStackTrace();
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return null;
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}
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}
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private static boolean verifySignature(byte[] data, byte[] signature, Certificate cert) throws NoSuchAlgorithmException, SignatureException, InvalidKeyException {
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Signature sig = Signature.getInstance("SHA256withRSA");
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sig.initVerify(cert.getPublicKey());
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sig.update(data);
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return sig.verify(signature);
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}
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private static byte[] signData(byte[] data, PrivateKey key) throws NoSuchAlgorithmException, SignatureException, InvalidKeyException {
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Signature sig = Signature.getInstance("SHA256withRSA");
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sig.initSign(key);
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sig.update(data);
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byte[] signature = new byte[256];
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sig.sign(signature, 0, signature.length);
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return signature;
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}
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private static byte[] decryptAes(byte[] encryptedData, SecretKey secretKey) throws NoSuchAlgorithmException, SignatureException,
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InvalidKeyException, ShortBufferException, IllegalBlockSizeException, BadPaddingException, NoSuchPaddingException {
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Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");
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int blockRoundedSize = ((encryptedData.length + 15) / 16) * 16;
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byte[] blockRoundedEncrypted = Arrays.copyOf(encryptedData, blockRoundedSize);
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byte[] fullDecrypted = new byte[blockRoundedSize];
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cipher.init(Cipher.DECRYPT_MODE, secretKey);
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cipher.doFinal(blockRoundedEncrypted, 0,
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blockRoundedSize, fullDecrypted);
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return fullDecrypted;
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}
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private static byte[] encryptAes(byte[] data, SecretKey secretKey) throws NoSuchAlgorithmException, SignatureException,
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InvalidKeyException, ShortBufferException, IllegalBlockSizeException, BadPaddingException, NoSuchPaddingException {
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Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");
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int blockRoundedSize = ((data.length + 15) / 16) * 16;
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byte[] blockRoundedData = Arrays.copyOf(data, blockRoundedSize);
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cipher.init(Cipher.ENCRYPT_MODE, secretKey);
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return cipher.doFinal(blockRoundedData);
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}
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private static SecretKey generateAesKey(byte[] keyData) {
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byte[] aesTruncated = Arrays.copyOf(toSHA1Bytes(keyData), 16);
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return new SecretKeySpec(aesTruncated, "AES");
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}
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private static byte[] concatBytes(byte[] a, byte[] b) {
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byte[] c = new byte[a.length + b.length];
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System.arraycopy(a, 0, c, 0, a.length);
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System.arraycopy(b, 0, c, a.length, b.length);
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return c;
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}
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public static String generatePinString() {
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Random r = new Random();
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return String.format((Locale)null, "%d%d%d%d",
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r.nextInt(10), r.nextInt(10),
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r.nextInt(10), r.nextInt(10));
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}
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public PairState getPairState(String serverInfo) throws MalformedURLException, IOException, XmlPullParserException {
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if (!NvHTTP.getXmlString(serverInfo, "PairStatus").equals("1")) {
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return PairState.NOT_PAIRED;
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}
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return PairState.PAIRED;
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}
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public PairState pair(String uniqueId, String pin) throws MalformedURLException, IOException, XmlPullParserException, CertificateException, InvalidKeyException, NoSuchAlgorithmException, SignatureException, ShortBufferException, IllegalBlockSizeException, BadPaddingException, NoSuchPaddingException {
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// Generate a salt for hashing the PIN
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byte[] salt = generateRandomBytes(16);
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// Combine the salt and pin, then create an AES key from them
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byte[] saltAndPin = saltPin(salt, pin);
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aesKey = generateAesKey(saltAndPin);
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// Send the salt and get the server cert. This doesn't have a read timeout
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// because the user must enter the PIN before the server responds
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String getCert = http.openHttpConnectionToString(http.baseUrl +
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"/pair?uniqueid="+uniqueId+"&devicename=roth&updateState=1&phrase=getservercert&salt="+
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bytesToHex(salt)+"&clientcert="+bytesToHex(pemCertBytes),
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false);
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if (!NvHTTP.getXmlString(getCert, "paired").equals("1")) {
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http.openHttpConnectionToString(http.baseUrl + "/unpair?uniqueid="+uniqueId, true);
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return PairState.FAILED;
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}
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X509Certificate serverCert = extractPlainCert(getCert);
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// Generate a random challenge and encrypt it with our AES key
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byte[] randomChallenge = generateRandomBytes(16);
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byte[] encryptedChallenge = encryptAes(randomChallenge, aesKey);
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// Send the encrypted challenge to the server
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String challengeResp = http.openHttpConnectionToString(http.baseUrl +
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"/pair?uniqueid="+uniqueId+"&devicename=roth&updateState=1&clientchallenge="+bytesToHex(encryptedChallenge),
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true);
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if (!NvHTTP.getXmlString(challengeResp, "paired").equals("1")) {
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http.openHttpConnectionToString(http.baseUrl + "/unpair?uniqueid="+uniqueId, true);
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return PairState.FAILED;
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}
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// Decode the server's response and subsequent challenge
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byte[] encServerChallengeResponse = hexToBytes(NvHTTP.getXmlString(challengeResp, "challengeresponse"));
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byte[] decServerChallengeResponse = decryptAes(encServerChallengeResponse, aesKey);
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byte[] serverResponse = Arrays.copyOfRange(decServerChallengeResponse, 0, 20);
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byte[] serverChallenge = Arrays.copyOfRange(decServerChallengeResponse, 20, 36);
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// Using another 16 bytes secret, compute a challenge response hash using the secret, our cert sig, and the challenge
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byte[] clientSecret = generateRandomBytes(16);
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byte[] challengeRespHash = toSHA1Bytes(concatBytes(concatBytes(serverChallenge, cert.getSignature()), clientSecret));
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byte[] challengeRespEncrypted = encryptAes(challengeRespHash, aesKey);
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String secretResp = http.openHttpConnectionToString(http.baseUrl +
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"/pair?uniqueid="+uniqueId+"&devicename=roth&updateState=1&serverchallengeresp="+bytesToHex(challengeRespEncrypted),
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true);
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if (!NvHTTP.getXmlString(secretResp, "paired").equals("1")) {
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http.openHttpConnectionToString(http.baseUrl + "/unpair?uniqueid="+uniqueId, true);
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return PairState.FAILED;
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}
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// Get the server's signed secret
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byte[] serverSecretResp = hexToBytes(NvHTTP.getXmlString(secretResp, "pairingsecret"));
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byte[] serverSecret = Arrays.copyOfRange(serverSecretResp, 0, 16);
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byte[] serverSignature = Arrays.copyOfRange(serverSecretResp, 16, 272);
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// Ensure the authenticity of the data
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if (!verifySignature(serverSecret, serverSignature, serverCert)) {
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// Cancel the pairing process
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http.openHttpConnectionToString(http.baseUrl + "/unpair?uniqueid="+uniqueId, true);
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// Looks like a MITM
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return PairState.FAILED;
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}
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// Ensure the server challenge matched what we expected (aka the PIN was correct)
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byte[] serverChallengeRespHash = toSHA1Bytes(concatBytes(concatBytes(randomChallenge, serverCert.getSignature()), serverSecret));
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if (!Arrays.equals(serverChallengeRespHash, serverResponse)) {
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// Cancel the pairing process
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http.openHttpConnectionToString(http.baseUrl + "/unpair?uniqueid="+uniqueId, true);
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// Probably got the wrong PIN
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return PairState.PIN_WRONG;
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}
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// Send the server our signed secret
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byte[] clientPairingSecret = concatBytes(clientSecret, signData(clientSecret, pk));
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String clientSecretResp = http.openHttpConnectionToString(http.baseUrl +
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"/pair?uniqueid="+uniqueId+"&devicename=roth&updateState=1&clientpairingsecret="+bytesToHex(clientPairingSecret),
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true);
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if (!NvHTTP.getXmlString(clientSecretResp, "paired").equals("1")) {
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http.openHttpConnectionToString(http.baseUrl + "/unpair?uniqueid="+uniqueId, true);
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return PairState.FAILED;
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}
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// Do the initial challenge (seems neccessary for us to show as paired)
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String pairChallenge = http.openHttpConnectionToString(http.baseUrl +
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"/pair?uniqueid="+uniqueId+"&devicename=roth&updateState=1&phrase=pairchallenge", true);
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if (!NvHTTP.getXmlString(pairChallenge, "paired").equals("1")) {
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http.openHttpConnectionToString(http.baseUrl + "/unpair?uniqueid="+uniqueId, true);
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return PairState.FAILED;
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}
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return PairState.PAIRED;
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}
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}
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