package eu.siacs.conversations.utils; import android.os.Build; import android.support.annotation.RequiresApi; import android.util.Log; import org.conscrypt.Conscrypt; import java.lang.reflect.Method; import java.security.NoSuchAlgorithmException; import java.util.Arrays; import java.util.Collection; import java.util.Collections; import java.util.LinkedList; import javax.net.ssl.SNIHostName; import javax.net.ssl.SSLContext; import javax.net.ssl.SSLParameters; import javax.net.ssl.SSLSession; import javax.net.ssl.SSLSocket; import eu.siacs.conversations.Config; import eu.siacs.conversations.entities.Account; public class SSLSocketHelper { public static void setSecurity(final SSLSocket sslSocket) { final String[] supportProtocols; final Collection supportedProtocols = new LinkedList<>( Arrays.asList(sslSocket.getSupportedProtocols())); supportedProtocols.remove("SSLv3"); supportProtocols = supportedProtocols.toArray(new String[supportedProtocols.size()]); sslSocket.setEnabledProtocols(supportProtocols); final String[] cipherSuites = CryptoHelper.getOrderedCipherSuites( sslSocket.getSupportedCipherSuites()); if (cipherSuites.length > 0) { sslSocket.setEnabledCipherSuites(cipherSuites); } } public static void setHostname(final SSLSocket socket, final String hostname) { if (Conscrypt.isConscrypt(socket)) { Conscrypt.setHostname(socket, hostname); } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) { setHostnameNougat(socket, hostname); } else { setHostnameReflection(socket, hostname); } } private static void setHostnameReflection(final SSLSocket socket, final String hostname) { try { socket.getClass().getMethod("setHostname", String.class).invoke(socket, hostname); } catch (Throwable e) { Log.e(Config.LOGTAG, "unable to set SNI name on socket (" + hostname + ")", e); } } @RequiresApi(api = Build.VERSION_CODES.N) private static void setHostnameNougat(final SSLSocket socket, final String hostname) { final SSLParameters parameters = new SSLParameters(); parameters.setServerNames(Collections.singletonList(new SNIHostName(hostname))); socket.setSSLParameters(parameters); } private static void setApplicationProtocolReflection(final SSLSocket socket, final String protocol) { try { final Method method = socket.getClass().getMethod("setAlpnProtocols", byte[].class); // the concatenation of 8-bit, length prefixed protocol names, just one in our case... // http://tools.ietf.org/html/draft-agl-tls-nextprotoneg-04#page-4 final byte[] protocolUTF8Bytes = protocol.getBytes("UTF-8"); final byte[] lengthPrefixedProtocols = new byte[protocolUTF8Bytes.length + 1]; lengthPrefixedProtocols[0] = (byte) protocol.length(); // cannot be over 255 anyhow System.arraycopy(protocolUTF8Bytes, 0, lengthPrefixedProtocols, 1, protocolUTF8Bytes.length); method.invoke(socket, new Object[]{lengthPrefixedProtocols}); } catch (Throwable e) { Log.e(Config.LOGTAG,"unable to set ALPN on socket",e); } } public static void setApplicationProtocol(final SSLSocket socket, final String protocol) { if (Conscrypt.isConscrypt(socket)) { Conscrypt.setApplicationProtocols(socket, new String[]{protocol}); } else { setApplicationProtocolReflection(socket, protocol); } } public static SSLContext getSSLContext() throws NoSuchAlgorithmException { try { return SSLContext.getInstance("TLSv1.3"); } catch (NoSuchAlgorithmException e) { return SSLContext.getInstance("TLSv1.2"); } } public static void log(Account account, SSLSocket socket) { SSLSession session = socket.getSession(); Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": protocol=" + session.getProtocol() + " cipher=" + session.getCipherSuite()); } }