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Spoof TLS/JA3/JA4 and HTTP/2 fingerprints in Java
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package org.bouncycastle.jsse.provider;
import java.net.Socket;
import java.security.GeneralSecurityException;
import java.security.InvalidAlgorithmParameterException;
import java.security.NoSuchAlgorithmException;
import java.security.Provider;
import java.security.cert.CertPath;
import java.security.cert.CertPathBuilder;
import java.security.cert.CertSelector;
import java.security.cert.CertStore;
import java.security.cert.CertStoreParameters;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.CollectionCertStoreParameters;
import java.security.cert.PKIXBuilderParameters;
import java.security.cert.PKIXCertPathBuilderResult;
import java.security.cert.PKIXParameters;
import java.security.cert.TrustAnchor;
import java.security.cert.X509CertSelector;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.net.ssl.SSLEngine;
import javax.net.ssl.X509TrustManager;
import org.bouncycastle.asn1.x509.KeyPurposeId;
import org.bouncycastle.jcajce.util.JcaJceHelper;
import org.bouncycastle.jsse.BCExtendedSSLSession;
import org.bouncycastle.jsse.BCSNIHostName;
import org.bouncycastle.jsse.BCSSLParameters;
import org.bouncycastle.jsse.BCX509ExtendedTrustManager;
import org.bouncycastle.jsse.java.security.BCAlgorithmConstraints;
import org.bouncycastle.tls.KeyExchangeAlgorithm;
import org.bouncycastle.tls.TlsUtils;
class ProvX509TrustManager
extends BCX509ExtendedTrustManager
{
private static final Logger LOG = Logger.getLogger(ProvX509TrustManager.class.getName());
private static final boolean provCheckRevocation = PropertyUtils
.getBooleanSystemProperty("com.sun.net.ssl.checkRevocation", false);
private static final boolean provTrustManagerCheckEKU = PropertyUtils
.getBooleanSystemProperty("org.bouncycastle.jsse.trustManager.checkEKU", true);
private static final Map keyUsagesServer = createKeyUsagesServer();
private static void addKeyUsageServer(Map keyUsages, int keyUsage, int... keyExchangeAlgorithms)
{
for (int keyExchangeAlgorithm : keyExchangeAlgorithms)
{
String authType = JsseUtils.getAuthTypeServer(keyExchangeAlgorithm);
if (null != keyUsages.put(authType, keyUsage))
{
throw new IllegalStateException("Duplicate keys in server key usages");
}
}
}
private static Map createKeyUsagesServer()
{
Map keyUsages = new HashMap();
addKeyUsageServer(keyUsages, ProvAlgorithmChecker.KU_DIGITAL_SIGNATURE, KeyExchangeAlgorithm.DHE_DSS,
KeyExchangeAlgorithm.DHE_RSA, KeyExchangeAlgorithm.ECDHE_ECDSA, KeyExchangeAlgorithm.ECDHE_RSA,
KeyExchangeAlgorithm.NULL);
addKeyUsageServer(keyUsages, ProvAlgorithmChecker.KU_KEY_ENCIPHERMENT, KeyExchangeAlgorithm.RSA);
addKeyUsageServer(keyUsages, ProvAlgorithmChecker.KU_KEY_AGREEMENT, KeyExchangeAlgorithm.DH_DSS,
KeyExchangeAlgorithm.DH_RSA, KeyExchangeAlgorithm.ECDH_ECDSA, KeyExchangeAlgorithm.ECDH_RSA);
return Collections.unmodifiableMap(keyUsages);
}
private final boolean isInFipsMode;
private final JcaJceHelper helper;
private final Set trustedCerts;
private final PKIXBuilderParameters pkixParametersTemplate;
private final X509TrustManager exportX509TrustManager;
ProvX509TrustManager(boolean isInFipsMode, JcaJceHelper helper, Set trustAnchors)
throws InvalidAlgorithmParameterException
{
this.isInFipsMode = isInFipsMode;
this.helper = helper;
this.trustedCerts = getTrustedCerts(trustAnchors);
// Setup PKIX parameters
if (trustedCerts.isEmpty())
{
this.pkixParametersTemplate = null;
}
else
{
this.pkixParametersTemplate = new PKIXBuilderParameters(trustAnchors, null);
this.pkixParametersTemplate.setRevocationEnabled(provCheckRevocation);
}
this.exportX509TrustManager = X509TrustManagerUtil.exportX509TrustManager(this);
}
ProvX509TrustManager(boolean isInFipsMode, JcaJceHelper helper, PKIXParameters baseParameters)
throws InvalidAlgorithmParameterException
{
this.isInFipsMode = isInFipsMode;
this.helper = helper;
this.trustedCerts = getTrustedCerts(baseParameters.getTrustAnchors());
// Setup PKIX parameters
if (trustedCerts.isEmpty())
{
this.pkixParametersTemplate = null;
}
else if (baseParameters instanceof PKIXBuilderParameters)
{
this.pkixParametersTemplate = (PKIXBuilderParameters)baseParameters;
}
else
{
this.pkixParametersTemplate = new PKIXBuilderParameters(baseParameters.getTrustAnchors(),
baseParameters.getTargetCertConstraints());
this.pkixParametersTemplate.setAnyPolicyInhibited(baseParameters.isAnyPolicyInhibited());
this.pkixParametersTemplate.setCertPathCheckers(baseParameters.getCertPathCheckers());
this.pkixParametersTemplate.setCertStores(baseParameters.getCertStores());
this.pkixParametersTemplate.setDate(baseParameters.getDate());
this.pkixParametersTemplate.setExplicitPolicyRequired(baseParameters.isExplicitPolicyRequired());
this.pkixParametersTemplate.setInitialPolicies(baseParameters.getInitialPolicies());
this.pkixParametersTemplate.setPolicyMappingInhibited(baseParameters.isPolicyMappingInhibited());
this.pkixParametersTemplate.setPolicyQualifiersRejected(baseParameters.getPolicyQualifiersRejected());
this.pkixParametersTemplate.setRevocationEnabled(baseParameters.isRevocationEnabled());
this.pkixParametersTemplate.setSigProvider(baseParameters.getSigProvider());
}
this.exportX509TrustManager = X509TrustManagerUtil.exportX509TrustManager(this);
}
X509TrustManager getExportX509TrustManager()
{
return exportX509TrustManager;
}
public void checkClientTrusted(X509Certificate[] chain, String authType)
throws CertificateException
{
checkTrusted(chain, authType, null, false);
}
public void checkClientTrusted(X509Certificate[] chain, String authType, Socket socket)
throws CertificateException
{
checkTrusted(chain, authType, TransportData.from(socket), false);
}
public void checkClientTrusted(X509Certificate[] chain, String authType, SSLEngine engine)
throws CertificateException
{
checkTrusted(chain, authType, TransportData.from(engine), false);
}
public void checkServerTrusted(X509Certificate[] chain, String authType)
throws CertificateException
{
checkTrusted(chain, authType, null, true);
}
public void checkServerTrusted(X509Certificate[] chain, String authType, Socket socket)
throws CertificateException
{
checkTrusted(chain, authType, TransportData.from(socket), true);
}
public void checkServerTrusted(X509Certificate[] chain, String authType, SSLEngine engine)
throws CertificateException
{
checkTrusted(chain, authType, TransportData.from(engine), true);
}
public X509Certificate[] getAcceptedIssuers()
{
return trustedCerts.toArray(new X509Certificate[trustedCerts.size()]);
}
private X509Certificate[] buildCertPath(X509Certificate[] chain, BCAlgorithmConstraints algorithmConstraints,
List statusResponses) throws GeneralSecurityException
{
/*
* RFC 8446 4.4.2 "For maximum compatibility, all implementations SHOULD be prepared to
* handle potentially extraneous certificates and arbitrary orderings from any TLS version,
* with the exception of the end-entity certificate which MUST be first."
*/
X509Certificate eeCert = chain[0];
if (trustedCerts.contains(eeCert))
{
return new X509Certificate[]{ eeCert };
}
// TODO Can we cache the CertificateFactory instance?
CertificateFactory certificateFactory = helper.createCertificateFactory("X.509");
Provider pkixProvider = certificateFactory.getProvider();
CertStoreParameters certStoreParameters = getCertStoreParameters(eeCert, chain);
CertStore certStore;
try
{
certStore = CertStore.getInstance("Collection", certStoreParameters, pkixProvider);
}
catch (GeneralSecurityException e)
{
certStore = CertStore.getInstance("Collection", certStoreParameters);
}
CertPathBuilder pkixBuilder;
try
{
pkixBuilder = CertPathBuilder.getInstance("PKIX", pkixProvider);
}
catch (NoSuchAlgorithmException e)
{
pkixBuilder = CertPathBuilder.getInstance("PKIX");
}
PKIXBuilderParameters pkixParameters = (PKIXBuilderParameters)pkixParametersTemplate.clone();
pkixParameters.addCertPathChecker(new ProvAlgorithmChecker(isInFipsMode, helper, algorithmConstraints));
pkixParameters.addCertStore(certStore);
pkixParameters.setTargetCertConstraints(
createTargetCertConstraints(eeCert, pkixParameters.getTargetCertConstraints()));
if (!statusResponses.isEmpty())
{
addStatusResponses(pkixBuilder, pkixParameters, chain, statusResponses);
}
PKIXCertPathBuilderResult result = (PKIXCertPathBuilderResult)pkixBuilder.build(pkixParameters);
/*
* TODO[jsse] Determine 'chainsToPublicCA' based on the trust anchor for the result
* chain. SunJSSE appears to consider this to be any trusted cert in original-location
* cacerts file with alias.contains(" [jdk")
*/
return getTrustedChain(result.getCertPath(), result.getTrustAnchor());
}
private void checkTrusted(X509Certificate[] chain, String authType, TransportData transportData,
boolean checkServerTrusted) throws CertificateException
{
if (TlsUtils.isNullOrEmpty(chain))
{
throw new IllegalArgumentException("'chain' must be a chain of at least one certificate");
}
if (TlsUtils.isNullOrEmpty(authType))
{
throw new IllegalArgumentException("'authType' must be a non-null, non-empty string");
}
if (null == pkixParametersTemplate)
{
throw new CertificateException("Unable to build a CertPath: no PKIXBuilderParameters available");
}
X509Certificate[] trustedChain = validateChain(chain, authType, transportData, checkServerTrusted);
checkExtendedTrust(trustedChain, transportData, checkServerTrusted);
}
// NOTE: We avoid re-reading eeCert from chain[0]
private CertStoreParameters getCertStoreParameters(X509Certificate eeCert, X509Certificate[] chain)
{
ArrayList certs = new ArrayList(chain.length);
certs.add(eeCert);
for (int i = 1; i < chain.length; ++i)
{
if (!trustedCerts.contains(chain[i]))
{
certs.add(chain[i]);
}
}
return new CollectionCertStoreParameters(Collections.unmodifiableCollection(certs));
}
private X509Certificate[] validateChain(X509Certificate[] chain, String authType, TransportData transportData,
boolean checkServerTrusted) throws CertificateException
{
try
{
BCAlgorithmConstraints algorithmConstraints = TransportData.getAlgorithmConstraints(transportData, false);
List statusResponses = TransportData.getStatusResponses(transportData);
X509Certificate[] trustedChain = buildCertPath(chain, algorithmConstraints, statusResponses);
KeyPurposeId ekuOID = getRequiredExtendedKeyUsage(checkServerTrusted);
int kuBit = getRequiredKeyUsage(checkServerTrusted, authType);
ProvAlgorithmChecker.checkCertPathExtras(helper, algorithmConstraints, trustedChain, ekuOID, kuBit);
// TODO[jsse] Consider supporting jdk.security.caDistrustPolicies security property
return trustedChain;
}
catch (CertificateException e)
{
throw e;
}
catch (GeneralSecurityException e)
{
throw new CertificateException("Unable to construct a valid chain", e);
}
}
static void checkEndpointID(String hostname, X509Certificate certificate, String endpointIDAlg)
throws CertificateException
{
// Strip "[]" off IPv6 addresses
hostname = JsseUtils.stripSquareBrackets(hostname);
if (endpointIDAlg.equalsIgnoreCase("HTTPS"))
{
HostnameUtil.checkHostname(hostname, certificate, true);
}
else if (endpointIDAlg.equalsIgnoreCase("LDAP") || endpointIDAlg.equalsIgnoreCase("LDAPS"))
{
HostnameUtil.checkHostname(hostname, certificate, false);
}
else
{
throw new CertificateException("Unknown endpoint ID algorithm: " + endpointIDAlg);
}
}
static void checkExtendedTrust(X509Certificate[] trustedChain, TransportData transportData,
boolean checkServerTrusted) throws CertificateException
{
if (null != transportData)
{
BCSSLParameters parameters = transportData.getParameters();
String endpointIDAlgorithm = parameters.getEndpointIdentificationAlgorithm();
if (JsseUtils.isNameSpecified(endpointIDAlgorithm))
{
BCExtendedSSLSession handshakeSession = transportData.getHandshakeSession();
if (null == handshakeSession)
{
throw new CertificateException("No handshake session");
}
checkEndpointID(trustedChain[0], endpointIDAlgorithm, checkServerTrusted, handshakeSession);
}
}
}
static KeyPurposeId getRequiredExtendedKeyUsage(boolean forServer)
{
return !provTrustManagerCheckEKU
? null
: forServer
? KeyPurposeId.id_kp_serverAuth
: KeyPurposeId.id_kp_clientAuth;
}
static int getRequiredKeyUsage(boolean checkServerTrusted, String authType)
throws CertificateException
{
if (!checkServerTrusted)
{
return ProvAlgorithmChecker.KU_DIGITAL_SIGNATURE;
}
Integer requiredKeyUsage = keyUsagesServer.get(authType);
if (null == requiredKeyUsage)
{
throw new CertificateException("Unsupported server authType: " + authType);
}
return requiredKeyUsage.intValue();
}
private static void addStatusResponses(CertPathBuilder pkixBuilder, PKIXBuilderParameters pkixParameters,
X509Certificate[] chain, List statusResponses)
{
Map statusResponseMap = new HashMap();
int count = Math.min(chain.length, statusResponses.size());
for (int i = 0; i < count; ++i)
{
byte[] statusResponse = statusResponses.get(i);
if (null != statusResponse && statusResponse.length > 0)
{
X509Certificate certificate = chain[i];
// TODO[jsse] putIfAbsent from JDK 8
if (!statusResponseMap.containsKey(certificate))
{
statusResponseMap.put(certificate, statusResponse);
}
}
}
if (!statusResponseMap.isEmpty())
{
try
{
PKIXUtil.addStatusResponses(pkixBuilder, pkixParameters, statusResponseMap);
}
catch (RuntimeException e)
{
// Use of the status responses is an optional optimization
LOG.log(Level.FINE, "Failed to add status responses for revocation checking", e);
}
}
}
private static void checkEndpointID(X509Certificate certificate, String endpointIDAlg, boolean checkServerTrusted,
BCExtendedSSLSession sslSession) throws CertificateException
{
String peerHost = sslSession.getPeerHost();
if (checkServerTrusted)
{
BCSNIHostName sniHostName = JsseUtils.getSNIHostName(sslSession.getRequestedServerNames());
if (null != sniHostName)
{
String hostname = sniHostName.getAsciiName();
if (!hostname.equalsIgnoreCase(peerHost))
{
try
{
checkEndpointID(hostname, certificate, endpointIDAlg);
return;
}
catch (CertificateException e)
{
// ignore (log only) and continue on to check 'peerHost' instead
LOG.log(Level.FINE, "Server's endpoint ID did not match the SNI host_name: " + hostname, e);
}
}
}
}
checkEndpointID(peerHost, certificate, endpointIDAlg);
}
private static X509CertSelector createTargetCertConstraints(final X509Certificate eeCert,
final CertSelector userConstraints)
{
return new X509CertSelector()
{
{
setCertificate(eeCert);
}
@Override
public boolean match(Certificate cert)
{
return super.match(cert) && (null == userConstraints || userConstraints.match(cert));
}
};
}
private static X509Certificate getTrustedCert(TrustAnchor trustAnchor) throws CertificateException
{
X509Certificate trustedCert = trustAnchor.getTrustedCert();
if (null == trustedCert)
{
throw new CertificateException("No certificate for TrustAnchor");
}
return trustedCert;
}
private static Set getTrustedCerts(Set trustAnchors)
{
Set result = new HashSet(trustAnchors.size());
for (TrustAnchor trustAnchor : trustAnchors)
{
if (null != trustAnchor)
{
X509Certificate trustedCert = trustAnchor.getTrustedCert();
if (null != trustedCert)
{
result.add(trustedCert);
}
}
}
return result;
}
private static X509Certificate[] getTrustedChain(CertPath certPath, TrustAnchor trustAnchor)
throws CertificateException
{
List certificates = certPath.getCertificates();
X509Certificate[] result = new X509Certificate[certificates.size() + 1];
certificates.toArray(result);
result[result.length - 1] = getTrustedCert(trustAnchor);
return result;
}
}