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move Domain Verifier to im.conversations

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Daniel Gultsch 2023-02-16 12:26:39 +01:00
parent b5a47000c9
commit b0010307c0
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3 changed files with 212 additions and 2 deletions
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210
src/main/java/im/conversations/android/tls/XmppDomainVerifier.java Normal file
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@ -0,0 +1,210 @@
package im.conversations.android.tls;
import android.util.Log;
import android.util.Pair;
import com.google.common.collect.ImmutableList;
import java.io.IOException;
import java.net.IDN;
import java.security.cert.Certificate;
import java.security.cert.CertificateEncodingException;
import java.security.cert.CertificateParsingException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Locale;
import javax.net.ssl.SSLPeerUnverifiedException;
import javax.net.ssl.SSLSession;
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;
public class XmppDomainVerifier {
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";
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;
}
}
public static boolean matchDomain(final String needle, final List<String> haystack) {
for (final String entry : haystack) {
if (entry.startsWith("*.")) {
int offset = 0;
while (offset < needle.length()) {
int i = needle.indexOf('.', offset);
if (i < 0) {
break;
}
if (needle.substring(i).equalsIgnoreCase(entry.substring(1))) {
return true;
}
offset = i + 1;
}
} else {
if (entry.equalsIgnoreCase(needle)) {
return true;
}
}
}
return false;
}
public boolean verify(
final String unicodeDomain, final String unicodeHostname, SSLSession sslSession)
throws SSLPeerUnverifiedException {
final String domain = IDN.toASCII(unicodeDomain);
final String hostname = unicodeHostname == null ? null : IDN.toASCII(unicodeHostname);
final Certificate[] chain = sslSession.getPeerCertificates();
if (chain.length == 0 || !(chain[0] instanceof X509Certificate)) {
return false;
}
final X509Certificate certificate = (X509Certificate) chain[0];
final List<String> commonNames = getCommonNames(certificate);
if (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;
}
}
try {
final ValidDomains validDomains = parseValidDomains(certificate);
Log.d(
LOGTAG,
"searching for "
+ domain
+ " in srvNames: "
+ validDomains.srvNames
+ " xmppAddrs: "
+ validDomains.xmppAddrs
+ " domains:"
+ validDomains.domains);
if (hostname != null) {
Log.d(LOGTAG, "also trying to verify hostname " + hostname);
}
return validDomains.xmppAddrs.contains(domain)
|| validDomains.srvNames.contains("_xmpp-client." + domain)
|| matchDomain(domain, validDomains.domains)
|| (hostname != null && matchDomain(hostname, validDomains.domains));
} catch (final Exception e) {
return false;
}
}
public static ValidDomains parseValidDomains(final X509Certificate certificate)
throws CertificateParsingException {
final List<String> commonNames = getCommonNames(certificate);
final Collection<List<?>> alternativeNames = certificate.getSubjectAlternativeNames();
final List<String> xmppAddrs = new ArrayList<>();
final List<String> srvNames = new ArrayList<>();
final List<String> domains = new ArrayList<>();
if (alternativeNames != null) {
for (List<?> san : alternativeNames) {
final Integer type = (Integer) san.get(0);
if (type == 0) {
final Pair<String, String> otherName = parseOtherName((byte[]) san.get(1));
if (otherName != null && otherName.first != null && otherName.second != null) {
switch (otherName.first) {
case SRV_NAME:
srvNames.add(otherName.second.toLowerCase(Locale.US));
break;
case XMPP_ADDR:
xmppAddrs.add(otherName.second.toLowerCase(Locale.US));
break;
default:
Log.d(
LOGTAG,
"oid: " + otherName.first + " value: " + otherName.second);
}
}
} else if (type == 2) {
final Object value = san.get(1);
if (value instanceof String) {
domains.add(((String) value).toLowerCase(Locale.US));
}
}
}
}
if (srvNames.size() == 0 && xmppAddrs.size() == 0 && domains.size() == 0) {
domains.addAll(commonNames);
}
return new ValidDomains(xmppAddrs, srvNames, domains);
}
public static final class ValidDomains {
final List<String> xmppAddrs;
final List<String> srvNames;
final List<String> domains;
private ValidDomains(List<String> xmppAddrs, List<String> srvNames, List<String> domains) {
this.xmppAddrs = xmppAddrs;
this.srvNames = srvNames;
this.domains = domains;
}
public List<String> all() {
ImmutableList.Builder<String> all = new ImmutableList.Builder<>();
all.addAll(xmppAddrs);
all.addAll(srvNames);
all.addAll(domains);
return all.build();
}
}
private boolean isSelfSigned(X509Certificate certificate) {
try {
certificate.verify(certificate.getPublicKey());
return true;
} catch (Exception e) {
return false;
}
}
}

2
src/main/java/im/conversations/android/xmpp/XmppConnection.java
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@ -20,7 +20,6 @@ import com.google.common.util.concurrent.MoreExecutors;
import com.google.common.util.concurrent.SettableFuture;
import eu.siacs.conversations.Config;
import eu.siacs.conversations.R;
import eu.siacs.conversations.crypto.XmppDomainVerifier;
import eu.siacs.conversations.services.MemorizingTrustManager;
import eu.siacs.conversations.services.NotificationService;
import eu.siacs.conversations.ui.util.PendingItem;
@ -36,6 +35,7 @@ import im.conversations.android.database.model.Account;
import im.conversations.android.database.model.Connection;
import im.conversations.android.database.model.Credential;
import im.conversations.android.tls.SSLSockets;
import im.conversations.android.tls.XmppDomainVerifier;
import im.conversations.android.xml.Element;
import im.conversations.android.xml.Namespace;
import im.conversations.android.xml.Tag;

2
src/main/java/im/conversations/android/xmpp/manager/RegistrationManager.java
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@ -1,11 +1,11 @@
package im.conversations.android.xmpp.manager;
import android.content.Context;
import android.util.Patterns;
import androidx.annotation.NonNull;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.MoreExecutors;
import eu.siacs.conversations.utils.Patterns;
import im.conversations.android.xml.Namespace;
import im.conversations.android.xmpp.XmppConnection;
import im.conversations.android.xmpp.model.data.Data;