package eu.siacs.conversations.crypto; import android.util.Log; 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.X509Certificate; import java.util.ArrayList; import java.util.Collection; import java.util.List; import javax.net.ssl.HostnameVerifier; import javax.net.ssl.SSLSession; public class XmppDomainVerifier implements HostnameVerifier { private final String LOGTAG = "XmppDomainVerifier"; private final String SRVName = "1.3.6.1.5.5.7.8.7"; private final String xmppAddr = "1.3.6.1.5.5.7.8.5"; @Override public boolean verify(String domain, SSLSession sslSession) { try { Certificate[] chain = sslSession.getPeerCertificates(); if (chain.length == 0 || !(chain[0] instanceof X509Certificate)) { return false; } X509Certificate certificate = (X509Certificate) chain[0]; Collection> alternativeNames = certificate.getSubjectAlternativeNames(); List xmppAddrs = new ArrayList<>(); List srvNames = new ArrayList<>(); List domains = new ArrayList<>(); if (alternativeNames != null) { for(List san : alternativeNames) { Integer type = (Integer) san.get(0); if (type == 0) { try { ASN1Primitive asn1Primitive = ASN1Primitive.fromByteArray((byte[]) san.get(1)); 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(); switch (oid) { case xmppAddr: if (value instanceof DERUTF8String) { xmppAddrs.add(((DERUTF8String) value).getString()); } else if (value instanceof DERIA5String) { xmppAddrs.add(((DERIA5String) value).getString()); } break; case SRVName: if (value instanceof DERUTF8String) { srvNames.add(((DERUTF8String) value).getString()); } else if (value instanceof DERIA5String) { srvNames.add(((DERIA5String) value).getString()); } break; default: Log.d(LOGTAG,"value was of type:"+value.getClass().getName()+ " oid was:"+oid); } } } } } catch (IOException e) { //ignored } } 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) { 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())); } } Log.d(LOGTAG, "searching for " + domain + " in srvNames: " + srvNames + " xmppAddrs: " + xmppAddrs + " domains:" + domains); return xmppAddrs.contains(domain) || srvNames.contains("_xmpp-client."+domain) || matchDomain(domain, domains); } catch (Exception e) { return false; } } private boolean matchDomain(String needle, List 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; } }