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package org.bouncycastle.tls;
import java.io.IOException;
import java.util.Hashtable;
import java.util.Vector;
import org.bouncycastle.tls.crypto.TlsCrypto;
import org.bouncycastle.util.Integers;
/**
* Base class for a TLS client.
*/
public abstract class AbstractTlsClient
extends AbstractTlsPeer
implements TlsClient
{
protected TlsClientContext context;
protected ProtocolVersion[] protocolVersions;
protected int[] cipherSuites;
protected Vector supportedGroups;
protected Vector supportedSignatureAlgorithms;
public AbstractTlsClient(TlsCrypto crypto)
{
super(crypto);
}
protected boolean allowUnexpectedServerExtension(Integer extensionType, byte[] extensionData)
throws IOException
{
switch (extensionType.intValue())
{
case ExtensionType.supported_groups:
/*
* Exception added based on field reports that some servers do send this, although the
* Supported Elliptic Curves Extension is clearly intended to be client-only. If
* present, we still require that it is a valid EllipticCurveList.
*/
TlsExtensionsUtils.readSupportedGroupsExtension(extensionData);
return true;
case ExtensionType.ec_point_formats:
/*
* Exception added based on field reports that some servers send this even when they
* didn't negotiate an ECC cipher suite. If present, we still require that it is a valid
* ECPointFormatList.
*/
TlsExtensionsUtils.readSupportedPointFormatsExtension(extensionData);
return true;
default:
return false;
}
}
protected Vector getNamedGroupRoles()
{
Vector namedGroupRoles = TlsUtils.getNamedGroupRoles(getCipherSuites());
if (null == supportedSignatureAlgorithms
|| TlsUtils.containsAnySignatureAlgorithm(supportedSignatureAlgorithms, SignatureAlgorithm.ecdsa))
{
TlsUtils.addToSet(namedGroupRoles, NamedGroupRole.ecdsa);
}
return namedGroupRoles;
}
protected void checkForUnexpectedServerExtension(Hashtable serverExtensions, Integer extensionType)
throws IOException
{
byte[] extensionData = TlsUtils.getExtensionData(serverExtensions, extensionType);
if (extensionData != null && !allowUnexpectedServerExtension(extensionType, extensionData))
{
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
}
public TlsPSKIdentity getPSKIdentity() throws IOException
{
return null;
}
public TlsSRPIdentity getSRPIdentity() throws IOException
{
return null;
}
public TlsDHGroupVerifier getDHGroupVerifier()
{
return new DefaultTlsDHGroupVerifier();
}
public TlsSRPConfigVerifier getSRPConfigVerifier()
{
return new DefaultTlsSRPConfigVerifier();
}
protected Vector getProtocolNames()
{
return null;
}
protected CertificateStatusRequest getCertificateStatusRequest()
{
return new CertificateStatusRequest(CertificateStatusType.ocsp, new OCSPStatusRequest(null, null));
}
protected Vector getSNIServerNames()
{
return null;
}
/**
* The default {@link #getClientExtensions()} implementation calls this to determine which named
* groups to include in the supported_groups extension for the ClientHello.
*
* @param namedGroupRoles
* The {@link NamedGroupRole named group roles} for which there should be at
* least one supported group. By default this is inferred from the offered cipher
* suites and signature algorithms.
* @return a {@link Vector} of {@link Integer}. See {@link NamedGroup} for group constants.
*/
protected Vector getSupportedGroups(Vector namedGroupRoles)
{
TlsCrypto crypto = getCrypto();
Vector supportedGroups = new Vector();
if (namedGroupRoles.contains(Integers.valueOf(NamedGroupRole.ecdh)))
{
TlsUtils.addIfSupported(supportedGroups, crypto, NamedGroup.x25519);
}
if (namedGroupRoles.contains(Integers.valueOf(NamedGroupRole.ecdh))
|| namedGroupRoles.contains(Integers.valueOf(NamedGroupRole.ecdsa)))
{
TlsUtils.addIfSupported(supportedGroups, crypto, new int[]{
NamedGroup.secp256r1, NamedGroup.secp384r1 });
}
if (namedGroupRoles.contains(Integers.valueOf(NamedGroupRole.dh)))
{
TlsUtils.addIfSupported(supportedGroups, crypto, new int[]{
NamedGroup.ffdhe2048, NamedGroup.ffdhe3072, NamedGroup.ffdhe4096 });
}
return supportedGroups;
}
protected Vector getSupportedSignatureAlgorithms()
{
return TlsUtils.getDefaultSupportedSignatureAlgorithms(context);
}
public void init(TlsClientContext context)
{
this.context = context;
this.protocolVersions = getSupportedVersions();
this.cipherSuites = getSupportedCipherSuites();
}
public ProtocolVersion[] getProtocolVersions()
{
return protocolVersions;
}
public int[] getCipherSuites()
{
return cipherSuites;
}
public void notifyHandshakeBeginning() throws IOException
{
super.notifyHandshakeBeginning();
this.supportedGroups = null;
this.supportedSignatureAlgorithms = null;
}
public TlsSession getSessionToResume()
{
return null;
}
public boolean isFallback()
{
/*
* RFC 7507 4. The TLS_FALLBACK_SCSV cipher suite value is meant for use by clients that
* repeat a connection attempt with a downgraded protocol (perform a "fallback retry") in
* order to work around interoperability problems with legacy servers.
*/
return false;
}
public Hashtable getClientExtensions()
throws IOException
{
Hashtable clientExtensions = new Hashtable();
boolean offeringPreTLSv13 = false;
{
ProtocolVersion[] supportedVersions = getProtocolVersions();
for (int i = 0; i < supportedVersions.length; ++i)
{
if (!TlsUtils.isTLSv13(supportedVersions[i]))
{
offeringPreTLSv13 = true;
break;
}
}
}
if (offeringPreTLSv13)
{
TlsExtensionsUtils.addEncryptThenMACExtension(clientExtensions);
}
Vector protocolNames = getProtocolNames();
if (protocolNames != null)
{
TlsExtensionsUtils.addALPNExtensionClient(clientExtensions, protocolNames);
}
Vector sniServerNames = getSNIServerNames();
if (sniServerNames != null)
{
TlsExtensionsUtils.addServerNameExtensionClient(clientExtensions, sniServerNames);
}
CertificateStatusRequest statusRequest = getCertificateStatusRequest();
if (statusRequest != null)
{
TlsExtensionsUtils.addStatusRequestExtension(clientExtensions, statusRequest);
}
ProtocolVersion clientVersion = context.getClientVersion();
/*
* RFC 5246 7.4.1.4.1. Note: this extension is not meaningful for TLS versions prior to 1.2.
* Clients MUST NOT offer it if they are offering prior versions.
*/
if (TlsUtils.isSignatureAlgorithmsExtensionAllowed(clientVersion))
{
this.supportedSignatureAlgorithms = getSupportedSignatureAlgorithms();
TlsExtensionsUtils.addSignatureAlgorithmsExtension(clientExtensions, supportedSignatureAlgorithms);
}
Vector namedGroupRoles = getNamedGroupRoles();
Vector supportedGroups = getSupportedGroups(namedGroupRoles);
if (supportedGroups != null && !supportedGroups.isEmpty())
{
this.supportedGroups = supportedGroups;
TlsExtensionsUtils.addSupportedGroupsExtension(clientExtensions, supportedGroups);
}
if (offeringPreTLSv13)
{
if (namedGroupRoles.contains(Integers.valueOf(NamedGroupRole.ecdh))
|| namedGroupRoles.contains(Integers.valueOf(NamedGroupRole.ecdsa)))
{
TlsExtensionsUtils.addSupportedPointFormatsExtension(clientExtensions, new short[]{ ECPointFormat.uncompressed });
}
}
return clientExtensions;
}
public Vector getEarlyKeyShareGroups()
{
if (null != supportedGroups)
{
if (supportedGroups.contains(Integers.valueOf(NamedGroup.x25519)))
{
return TlsUtils.vectorOfOne(Integers.valueOf(NamedGroup.x25519));
}
if (supportedGroups.contains(Integers.valueOf(NamedGroup.secp256r1)))
{
return TlsUtils.vectorOfOne(Integers.valueOf(NamedGroup.secp256r1));
}
}
return null;
}
public void notifyServerVersion(ProtocolVersion serverVersion)
throws IOException
{
}
public void notifySessionID(byte[] sessionID)
{
}
public void notifySelectedCipherSuite(int selectedCipherSuite)
{
}
public void processServerExtensions(Hashtable serverExtensions)
throws IOException
{
/*
* TlsProtocol implementation validates that any server extensions received correspond to
* client extensions sent. By default, we don't send any, and this method is not called.
*/
if (serverExtensions != null)
{
/*
* RFC 5246 7.4.1.4.1. Servers MUST NOT send this extension.
*/
checkForUnexpectedServerExtension(serverExtensions, TlsUtils.EXT_signature_algorithms);
checkForUnexpectedServerExtension(serverExtensions, TlsUtils.EXT_signature_algorithms_cert);
checkForUnexpectedServerExtension(serverExtensions, TlsExtensionsUtils.EXT_supported_groups);
int selectedCipherSuite = context.getSecurityParametersHandshake().getCipherSuite();
if (TlsECCUtils.isECCCipherSuite(selectedCipherSuite))
{
// We only support uncompressed format, this is just to validate the extension, if present.
TlsExtensionsUtils.getSupportedPointFormatsExtension(serverExtensions);
}
else
{
checkForUnexpectedServerExtension(serverExtensions, TlsExtensionsUtils.EXT_ec_point_formats);
}
/*
* RFC 7685 3. The server MUST NOT echo the extension.
*/
checkForUnexpectedServerExtension(serverExtensions, TlsExtensionsUtils.EXT_padding);
}
}
public void processServerSupplementalData(Vector serverSupplementalData)
throws IOException
{
if (serverSupplementalData != null)
{
throw new TlsFatalAlert(AlertDescription.unexpected_message);
}
}
public Vector getClientSupplementalData()
throws IOException
{
return null;
}
public void notifyNewSessionTicket(NewSessionTicket newSessionTicket)
throws IOException
{
}
}
