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package de.pixart.messenger.crypto;
import android.os.Build;
import android.util.Log;
import android.util.Pair;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.DERIA5String;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.DERUTF8String;
import org.bouncycastle.asn1.DLSequence;
import org.bouncycastle.asn1.x500.RDN;
import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.asn1.x500.style.BCStyle;
import org.bouncycastle.asn1.x500.style.IETFUtils;
import org.bouncycastle.cert.jcajce.JcaX509CertificateHolder;
import java.io.IOException;
import java.security.cert.Certificate;
import java.security.cert.CertificateEncodingException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import javax.net.ssl.SSLSession;
public class XmppDomainVerifier implements DomainHostnameVerifier {
private static final String LOGTAG = "XmppDomainVerifier";
private static final String SRV_NAME = "1.3.6.1.5.5.7.8.7";
private static final String XMPP_ADDR = "1.3.6.1.5.5.7.8.5";
@Override
public boolean verify(String domain, String hostname, SSLSession sslSession) {
try {
Certificate[] chain = sslSession.getPeerCertificates();
if (chain.length == 0 || !(chain[0] instanceof X509Certificate)) {
return false;
}
X509Certificate certificate = (X509Certificate) chain[0];
final List<String> commonNames = getCommonNames(certificate);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT && isSelfSigned(certificate)) {
if (commonNames.size() == 1 && matchDomain(domain, commonNames)) {
Log.d(LOGTAG, "accepted CN in self signed cert as work around for " + domain);
return true;
}
}
Collection<List<?>> alternativeNames = certificate.getSubjectAlternativeNames();
List<String> xmppAddrs = new ArrayList<>();
List<String> srvNames = new ArrayList<>();
List<String> domains = new ArrayList<>();
if (alternativeNames != null) {
for (List<?> san : alternativeNames) {
Integer type = (Integer) san.get(0);
if (type == 0) {
Pair<String, String> otherName = parseOtherName((byte[]) san.get(1));
if (otherName != null) {
switch (otherName.first) {
case SRV_NAME:
srvNames.add(otherName.second);
break;
case XMPP_ADDR:
xmppAddrs.add(otherName.second);
break;
default:
Log.d(LOGTAG, "oid: " + otherName.first + " value: " + otherName.second);
}
}
} else if (type == 2) {
Object value = san.get(1);
if (value instanceof String) {
domains.add((String) value);
}
}
}
}
if (srvNames.size() == 0 && xmppAddrs.size() == 0 && domains.size() == 0) {
domains.addAll(commonNames);
}
Log.d(LOGTAG, "searching for " + domain + " in srvNames: " + srvNames + " xmppAddrs: " + xmppAddrs + " domains:" + domains);
if (hostname != null) {
Log.d(LOGTAG, "also trying to verify hostname " + hostname);
}
return xmppAddrs.contains(domain)
|| srvNames.contains("_xmpp-client." + domain)
|| matchDomain(domain, domains)
|| (hostname != null && matchDomain(hostname, domains));
} catch (Exception e) {
return false;
}
}
private static List<String> getCommonNames(X509Certificate certificate) {
List<String> domains = new ArrayList<>();
try {
X500Name x500name = new JcaX509CertificateHolder(certificate).getSubject();
RDN[] rdns = x500name.getRDNs(BCStyle.CN);
for (int i = 0; i < rdns.length; ++i) {
domains.add(IETFUtils.valueToString(x500name.getRDNs(BCStyle.CN)[i].getFirst().getValue()));
}
return domains;
} catch (CertificateEncodingException e) {
return domains;
}
}
private static Pair<String, String> parseOtherName(byte[] otherName) {
try {
ASN1Primitive asn1Primitive = ASN1Primitive.fromByteArray(otherName);
if (asn1Primitive instanceof DERTaggedObject) {
ASN1Primitive inner = ((DERTaggedObject) asn1Primitive).getObject();
if (inner instanceof DLSequence) {
DLSequence sequence = (DLSequence) inner;
if (sequence.size() >= 2 && sequence.getObjectAt(1) instanceof DERTaggedObject) {
String oid = sequence.getObjectAt(0).toString();
ASN1Primitive value = ((DERTaggedObject) sequence.getObjectAt(1)).getObject();
if (value instanceof DERUTF8String) {
return new Pair<>(oid, ((DERUTF8String) value).getString());
} else if (value instanceof DERIA5String) {
return new Pair<>(oid, ((DERIA5String) value).getString());
}
}
}
}
return null;
} catch (IOException e) {
return null;
}
}
private static boolean matchDomain(String needle, List<String> haystack) {
for (String entry : haystack) {
if (entry.startsWith("*.")) {
int i = needle.indexOf('.');
Log.d(LOGTAG, "comparing " + needle.substring(i) + " and " + entry.substring(1));
if (i != -1 && needle.substring(i).equals(entry.substring(1))) {
Log.d(LOGTAG, "domain " + needle + " matched " + entry);
return true;
}
} else {
if (entry.equals(needle)) {
Log.d(LOGTAG, "domain " + needle + " matched " + entry);
return true;
}
}
}
return false;
}
private boolean isSelfSigned(X509Certificate certificate) {
try {
certificate.verify(certificate.getPublicKey());
return true;
} catch (Exception e) {
return false;
}
}
@Override
public boolean verify(String domain, SSLSession sslSession) {
return verify(domain, null, sslSession);
}
}
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