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show domains in manual cert accept dialog

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This commit is contained in:
Daniel Gultsch 2021-05-03 08:28:03 +02:00
parent a40b82b85b
commit ac7855a332
4 changed files with 117 additions and 70 deletions
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3
src/main/java/eu/siacs/conversations/crypto/DomainHostnameVerifier.java
View file

@ -1,10 +1,11 @@
package eu.siacs.conversations.crypto;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLPeerUnverifiedException;
import javax.net.ssl.SSLSession;
public interface DomainHostnameVerifier extends HostnameVerifier {
boolean verify(String domain, String hostname, SSLSession sslSession);
boolean verify(String domain, String hostname, SSLSession sslSession) throws SSLPeerUnverifiedException;
}

138
src/main/java/eu/siacs/conversations/crypto/XmppDomainVerifier.java
View file

@ -3,6 +3,8 @@ package eu.siacs.conversations.crypto;
import android.util.Log;
import android.util.Pair;
import com.google.common.collect.ImmutableList;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.DERIA5String;
import org.bouncycastle.asn1.DERTaggedObject;
@ -18,15 +20,17 @@ 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;
public class XmppDomainVerifier implements DomainHostnameVerifier {
public class XmppDomainVerifier {
private static final String LOGTAG = "XmppDomainVerifier";
@ -94,68 +98,93 @@ public class XmppDomainVerifier implements DomainHostnameVerifier {
return false;
}
@Override
public boolean verify(final String unicodeDomain,final String unicodeHostname, SSLSession sslSession) {
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 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;
}
}
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);
}
Log.d(LOGTAG, "searching for " + domain + " in srvNames: " + srvNames + " xmppAddrs: " + xmppAddrs + " domains:" + domains);
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 xmppAddrs.contains(domain)
|| srvNames.contains("_xmpp-client." + domain)
|| matchDomain(domain, domains)
|| (hostname != null && matchDomain(hostname, domains));
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());
@ -164,9 +193,4 @@ public class XmppDomainVerifier implements DomainHostnameVerifier {
return false;
}
}
@Override
public boolean verify(String domain, SSLSession sslSession) {
return verify(domain, null, sslSession);
}
}

34
src/main/java/eu/siacs/conversations/services/MemorizingTrustManager.java
View file

@ -42,6 +42,7 @@ import android.util.SparseArray;
import androidx.appcompat.app.AppCompatActivity;
import com.google.common.base.Charsets;
import com.google.common.base.Joiner;
import com.google.common.io.CharStreams;
import org.json.JSONArray;
@ -61,12 +62,13 @@ import java.security.NoSuchAlgorithmException;
import java.security.cert.Certificate;
import java.security.cert.CertificateEncodingException;
import java.security.cert.CertificateException;
import java.security.cert.CertificateExpiredException;
import java.security.cert.CertificateParsingException;
import java.security.cert.X509Certificate;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.Locale;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.regex.Pattern;
@ -76,6 +78,7 @@ import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;
import eu.siacs.conversations.R;
import eu.siacs.conversations.crypto.XmppDomainVerifier;
import eu.siacs.conversations.entities.MTMDecision;
import eu.siacs.conversations.http.HttpConnectionManager;
import eu.siacs.conversations.persistance.FileBackend;
@ -93,6 +96,8 @@ import eu.siacs.conversations.ui.MemorizingActivity;
*/
public class MemorizingTrustManager {
private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd", Locale.US);
final static String DECISION_INTENT = "de.duenndns.ssl.DECISION";
public final static String DECISION_INTENT_ID = DECISION_INTENT + ".decisionId";
public final static String DECISION_INTENT_CERT = DECISION_INTENT + ".cert";
@ -521,14 +526,24 @@ public class MemorizingTrustManager {
return myId;
}
private void certDetails(StringBuffer si, X509Certificate c) {
SimpleDateFormat validityDateFormater = new SimpleDateFormat("yyyy-MM-dd");
private void certDetails(final StringBuffer si, final X509Certificate c, final boolean showValidFor) {
si.append("\n");
si.append(c.getSubjectDN().toString());
if (showValidFor) {
try {
si.append("Valid for: ");
si.append(Joiner.on(", ").join(XmppDomainVerifier.parseValidDomains(c).all()));
} catch (final CertificateParsingException e) {
si.append("Unable to parse Certificate");
}
si.append("\n");
} else {
si.append(c.getSubjectDN());
}
si.append("\n");
si.append(validityDateFormater.format(c.getNotBefore()));
si.append(DATE_FORMAT.format(c.getNotBefore()));
si.append(" - ");
si.append(validityDateFormater.format(c.getNotAfter()));
si.append(DATE_FORMAT.format(c.getNotAfter()));
si.append("\nSHA-256: ");
si.append(certHash(c, "SHA-256"));
si.append("\nSHA-1: ");
@ -541,7 +556,7 @@ public class MemorizingTrustManager {
private String certChainMessage(final X509Certificate[] chain, CertificateException cause) {
Throwable e = cause;
LOGGER.log(Level.FINE, "certChainMessage for " + e);
StringBuffer si = new StringBuffer();
final StringBuffer si = new StringBuffer();
if (e.getCause() != null) {
e = e.getCause();
// HACK: there is no sane way to check if the error is a "trust anchor
@ -556,8 +571,9 @@ public class MemorizingTrustManager {
si.append(master.getString(R.string.mtm_connect_anyway));
si.append("\n\n");
si.append(master.getString(R.string.mtm_cert_details));
for (X509Certificate c : chain) {
certDetails(si, c);
si.append('\n');
for(int i = 0; i < chain.length; ++i) {
certDetails(si, chain[i], i == 0);
}
return si.toString();
}

12
src/main/java/eu/siacs/conversations/xmpp/XmppConnection.java
View file

@ -46,6 +46,7 @@ import java.util.regex.Matcher;
import javax.net.ssl.KeyManager;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLPeerUnverifiedException;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.X509KeyManager;
@ -826,10 +827,15 @@ public class XmppConnection implements Runnable {
SSLSocketHelper.setHostname(sslSocket, IDN.toASCII(account.getServer()));
SSLSocketHelper.setApplicationProtocol(sslSocket, "xmpp-client");
final XmppDomainVerifier xmppDomainVerifier = new XmppDomainVerifier();
if (!xmppDomainVerifier.verify(account.getServer(), this.verifiedHostname, sslSocket.getSession())) {
Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": TLS certificate domain verification failed");
try {
if (!xmppDomainVerifier.verify(account.getServer(), this.verifiedHostname, sslSocket.getSession())) {
Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": TLS certificate domain verification failed");
FileBackend.close(sslSocket);
throw new StateChangingException(Account.State.TLS_ERROR_DOMAIN);
}
} catch (final SSLPeerUnverifiedException e) {
FileBackend.close(sslSocket);
throw new StateChangingException(Account.State.TLS_ERROR_DOMAIN);
throw new StateChangingException(Account.State.TLS_ERROR);
}
return sslSocket;
}