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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.InetAddress;
import java.net.UnknownHostException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.Collection;
import java.util.List;
import java.util.Locale;
import java.util.StringTokenizer;
import javax.security.auth.x500.X500Principal;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1String;
import org.bouncycastle.asn1.x500.AttributeTypeAndValue;
import org.bouncycastle.asn1.x500.RDN;
import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.asn1.x500.style.BCStyle;
import org.bouncycastle.asn1.x509.GeneralName;
import org.bouncycastle.jsse.BCSNIHostName;
import org.bouncycastle.util.IPAddress;
class HostnameUtil
{
static void checkHostname(String hostname, X509Certificate certificate, boolean allWildcards) throws CertificateException
{
if (null == hostname)
{
throw new CertificateException("No hostname specified for HTTPS endpoint ID check");
}
if (IPAddress.isValid(hostname))
{
Collection> subjectAltNames = certificate.getSubjectAlternativeNames();
if (null != subjectAltNames)
{
for (List subjectAltName : subjectAltNames)
{
int type = ((Integer)subjectAltName.get(0)).intValue();
if (GeneralName.iPAddress != type)
{
continue;
}
String ipAddress = (String)subjectAltName.get(1);
if (hostname.equalsIgnoreCase(ipAddress))
{
return;
}
try
{
if (InetAddress.getByName(hostname).equals(InetAddress.getByName(ipAddress)))
{
return;
}
}
catch (UnknownHostException e)
{
// Ignore
}
catch (SecurityException e)
{
// Ignore
}
}
}
throw new CertificateException("No subject alternative name found matching IP address " + hostname);
}
else if (isValidDomainName(hostname))
{
Collection> subjectAltNames = certificate.getSubjectAlternativeNames();
if (null != subjectAltNames)
{
boolean foundAnyDNSNames = false;
for (List subjectAltName : subjectAltNames)
{
int type = ((Integer)subjectAltName.get(0)).intValue();
if (GeneralName.dNSName != type)
{
continue;
}
foundAnyDNSNames = true;
String dnsName = (String)subjectAltName.get(1);
if (matchesDNSName(hostname, dnsName, allWildcards))
{
return;
}
}
// NOTE: If any DNS names were found, don't check the subject
if (foundAnyDNSNames)
{
throw new CertificateException("No subject alternative name found matching domain name " + hostname);
}
}
ASN1Primitive commonName = findMostSpecificCN(certificate.getSubjectX500Principal());
if (commonName instanceof ASN1String
&& matchesDNSName(hostname, ((ASN1String)commonName).getString(), allWildcards))
{
return;
}
throw new CertificateException("No name found matching " + hostname);
}
else
{
throw new CertificateException("Invalid hostname specified for HTTPS endpoint ID check");
}
}
private static ASN1Primitive findMostSpecificCN(X500Principal principal)
{
if (null != principal)
{
RDN[] rdns = X500Name.getInstance(principal.getEncoded()).getRDNs();
for (int i = rdns.length - 1; i >= 0; --i)
{
AttributeTypeAndValue[] typesAndValues = rdns[i].getTypesAndValues();
for (int j = 0; j < typesAndValues.length; ++j)
{
AttributeTypeAndValue typeAndValue = typesAndValues[j];
if (BCStyle.CN.equals(typeAndValue.getType()))
{
return typeAndValue.getValue().toASN1Primitive();
}
}
}
}
return null;
}
private static String getLabel(String s, int begin)
{
int end = s.indexOf('.', begin);
if (end < 0)
{
end = s.length();
}
return s.substring(begin, end);
}
private static boolean isValidDomainName(String name)
{
try
{
new BCSNIHostName(name);
return true;
}
catch (RuntimeException e)
{
return false;
}
}
private static boolean labelMatchesPattern(String label, String pattern)
{
int wildcardPos = pattern.indexOf('*');
if (wildcardPos < 0)
{
return label.equals(pattern);
}
int labelPos = 0, patternPos = 0;
do
{
String segment = pattern.substring(patternPos, wildcardPos);
int matchPos = label.indexOf(segment, labelPos);
if (matchPos < 0 || (patternPos == 0 && matchPos > 0))
{
return false;
}
labelPos = matchPos + segment.length();
patternPos = wildcardPos + 1;
}
while ((wildcardPos = pattern.indexOf('*', patternPos)) >= 0);
String labelRest = label.substring(labelPos);
String patternRest = pattern.substring(patternPos);
return labelRest.endsWith(patternRest);
}
private static boolean matchesDNSName(String hostname, String dnsName, boolean allWildcards)
{
try
{
// TODO[jsse] 'hostname' conversion per call is redundant (and with isValidDomainName)
hostname = IDNUtil.toUnicode(IDNUtil.toASCII(hostname, 0), 0);
dnsName = IDNUtil.toUnicode(IDNUtil.toASCII(dnsName, 0), 0);
}
catch (RuntimeException e)
{
return false;
}
if (!validateWildcards(dnsName))
{
return false;
}
if (!isValidDomainName(dnsName.replace('*', 'z')))
{
return false;
}
hostname = hostname.toLowerCase(Locale.ENGLISH);
dnsName = dnsName.toLowerCase(Locale.ENGLISH);
return allWildcards
? matchesWildcardsAllLabels(hostname, dnsName)
: matchesWildcardsFirstLabel(hostname, dnsName);
}
private static boolean matchesWildcardsAllLabels(String hostname, String dnsName)
{
StringTokenizer st1 = new StringTokenizer(hostname, ".");
StringTokenizer st2 = new StringTokenizer(dnsName, ".");
if (st1.countTokens() != st2.countTokens())
{
return false;
}
while (st1.hasMoreTokens())
{
String label = st1.nextToken();
String pattern = st2.nextToken();
if (!labelMatchesPattern(label, pattern))
{
return false;
}
}
return true;
}
private static boolean matchesWildcardsFirstLabel(String hostname, String dnsName)
{
String hostnameLabel = getLabel(hostname, 0);
String dnsNameLabel = getLabel(dnsName, 0);
if (!labelMatchesPattern(hostnameLabel, dnsNameLabel))
{
return false;
}
String hostnameRest = hostname.substring(hostnameLabel.length());
String dnsNameRest = dnsName.substring(dnsNameLabel.length());
return hostnameRest.equals(dnsNameRest);
}
private static boolean validateWildcards(String dnsName)
{
int wildCardIndex = dnsName.lastIndexOf('*');
if (wildCardIndex >= 0)
{
// TODO[jsse] Are these checks redundant?
if (dnsName.equals("*") || dnsName.equals("*."))
{
return false;
}
// There must be at least one dot after the last wildcard
int dotIndex = dnsName.indexOf('.', wildCardIndex + 1);
if (dotIndex < 0)
{
return false;
}
/*
* TODO[jsse] Wildcards not allowed in the label immediately before an ICANN public
* suffix when certificate 'chainsToPublicCA' (a SunJSSE code term - exact meaning?).
*/
// if (chainsToPublicCA)
// {
// String suffix = dnsName.substring(dotIndex).toLowerCase(Locale.ENGLISH);
//
// // TODO[jsse] Implement (case-insensitive)
// if (isPublicSuffix(suffix))
// {
// return false;
// }
// }
}
return true;
}
}