1package eu.siacs.conversations.utils;
  2
  3import android.os.Build;
  4import android.support.annotation.RequiresApi;
  5import android.util.Log;
  6
  7import org.conscrypt.Conscrypt;
  8
  9import java.lang.reflect.Method;
 10import java.security.NoSuchAlgorithmException;
 11import java.util.Arrays;
 12import java.util.Collection;
 13import java.util.Collections;
 14import java.util.LinkedList;
 15
 16import javax.net.ssl.SNIHostName;
 17import javax.net.ssl.SSLContext;
 18import javax.net.ssl.SSLParameters;
 19import javax.net.ssl.SSLSession;
 20import javax.net.ssl.SSLSocket;
 21
 22import eu.siacs.conversations.Config;
 23import eu.siacs.conversations.entities.Account;
 24
 25public class SSLSocketHelper {
 26
 27    public static void setSecurity(final SSLSocket sslSocket) {
 28        final String[] supportProtocols;
 29        final Collection<String> supportedProtocols = new LinkedList<>(
 30                Arrays.asList(sslSocket.getSupportedProtocols()));
 31        supportedProtocols.remove("SSLv3");
 32        supportProtocols = supportedProtocols.toArray(new String[supportedProtocols.size()]);
 33
 34        sslSocket.setEnabledProtocols(supportProtocols);
 35
 36        final String[] cipherSuites = CryptoHelper.getOrderedCipherSuites(
 37                sslSocket.getSupportedCipherSuites());
 38        if (cipherSuites.length > 0) {
 39            sslSocket.setEnabledCipherSuites(cipherSuites);
 40        }
 41    }
 42
 43    public static void setHostname(final SSLSocket socket, final String hostname) {
 44        if (Conscrypt.isConscrypt(socket)) {
 45            Conscrypt.setHostname(socket, hostname);
 46        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
 47            setHostnameNougat(socket, hostname);
 48        } else {
 49            setHostnameReflection(socket, hostname);
 50        }
 51    }
 52
 53    private static void setHostnameReflection(final SSLSocket socket, final String hostname) {
 54        try {
 55            socket.getClass().getMethod("setHostname", String.class).invoke(socket, hostname);
 56        } catch (Throwable e) {
 57            Log.e(Config.LOGTAG, "unable to set SNI name on socket (" + hostname + ")", e);
 58        }
 59    }
 60
 61    @RequiresApi(api = Build.VERSION_CODES.N)
 62    private static void setHostnameNougat(final SSLSocket socket, final String hostname) {
 63        final SSLParameters parameters = new SSLParameters();
 64        parameters.setServerNames(Collections.singletonList(new SNIHostName(hostname)));
 65        socket.setSSLParameters(parameters);
 66    }
 67
 68    private static void setApplicationProtocolReflection(final SSLSocket socket, final String protocol) {
 69        try {
 70            final Method method = socket.getClass().getMethod("setAlpnProtocols", byte[].class);
 71            // the concatenation of 8-bit, length prefixed protocol names, just one in our case...
 72            // http://tools.ietf.org/html/draft-agl-tls-nextprotoneg-04#page-4
 73            final byte[] protocolUTF8Bytes = protocol.getBytes("UTF-8");
 74            final byte[] lengthPrefixedProtocols = new byte[protocolUTF8Bytes.length + 1];
 75            lengthPrefixedProtocols[0] = (byte) protocol.length(); // cannot be over 255 anyhow
 76            System.arraycopy(protocolUTF8Bytes, 0, lengthPrefixedProtocols, 1, protocolUTF8Bytes.length);
 77            method.invoke(socket, new Object[]{lengthPrefixedProtocols});
 78        } catch (Throwable e) {
 79            Log.e(Config.LOGTAG,"unable to set ALPN on socket",e);
 80        }
 81    }
 82
 83    public static void setApplicationProtocol(final SSLSocket socket, final String protocol) {
 84        if (Conscrypt.isConscrypt(socket)) {
 85            Conscrypt.setApplicationProtocols(socket, new String[]{protocol});
 86        } else {
 87            setApplicationProtocolReflection(socket, protocol);
 88        }
 89    }
 90
 91    public static SSLContext getSSLContext() throws NoSuchAlgorithmException {
 92        try {
 93            return SSLContext.getInstance("TLSv1.3");
 94        } catch (NoSuchAlgorithmException e) {
 95            return SSLContext.getInstance("TLSv1.2");
 96        }
 97    }
 98
 99    public static void log(Account account, SSLSocket socket) {
100        SSLSession session = socket.getSession();
101        Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": protocol=" + session.getProtocol() + " cipher=" + session.getCipherSuite());
102    }
103}