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package eu.siacs.conversations.utils;
import android.os.Build;
import java.lang.reflect.Method;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.Collection;
import java.util.LinkedList;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
public class SSLSocketHelper {
public static void setSecurity(final SSLSocket sslSocket) throws NoSuchAlgorithmException {
final String[] supportProtocols;
final Collection<String> 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 setSNIHost(final SSLSocketFactory factory, final SSLSocket socket, final String hostname) {
if (factory instanceof android.net.SSLCertificateSocketFactory && android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN_MR1) {
((android.net.SSLCertificateSocketFactory) factory).setHostname(socket, hostname);
} else {
try {
socket.getClass().getMethod("setHostname", String.class).invoke(socket, hostname);
} catch (Throwable e) {
// ignore any error, we just can't set the hostname...
}
}
}
public static void setAlpnProtocol(final SSLSocketFactory factory, final SSLSocket socket, final String protocol) {
try {
if (factory instanceof android.net.SSLCertificateSocketFactory && android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
// can't call directly because of @hide?
//((android.net.SSLCertificateSocketFactory)factory).setAlpnProtocols(new byte[][]{protocol.getBytes("UTF-8")});
android.net.SSLCertificateSocketFactory.class.getMethod("setAlpnProtocols", byte[][].class).invoke(socket, new Object[]{new byte[][]{protocol.getBytes("UTF-8")}});
} else {
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) {
// ignore any error, we just can't set the alpn protocol...
}
}
public static SSLContext getSSLContext() throws NoSuchAlgorithmException {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
return SSLContext.getInstance("TLSv1.2");
} else {
return SSLContext.getInstance("TLS");
}
}
}
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