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-rw-r--r--src/main/java/de/thedevstack/conversationsplus/crypto/XmppDomainVerifier.java127
1 files changed, 127 insertions, 0 deletions
diff --git a/src/main/java/de/thedevstack/conversationsplus/crypto/XmppDomainVerifier.java b/src/main/java/de/thedevstack/conversationsplus/crypto/XmppDomainVerifier.java
new file mode 100644
index 00000000..c9f65a97
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/crypto/XmppDomainVerifier.java
@@ -0,0 +1,127 @@
+package de.thedevstack.conversationsplus.crypto;
+
+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.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 static 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<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 SRVName:
+ srvNames.add(otherName.second);
+ break;
+ case xmppAddr:
+ 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) {
+ 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 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;
+ }
+}