private String hostNameMessage(X509Certificate cert, String hostname) {
StringBuffer si = new StringBuffer();
si.append(master.getString(R.string.mtm_hostname_mismatch, hostname));
si.append("\n\n");
try {
Collection<List<?>> sans = cert.getSubjectAlternativeNames();
if (sans == null) {
si.append(cert.getSubjectDN());
si.append("\n");
} else
for (List<?> altName : sans) {
Object name = altName.get(1);
if (name instanceof String) {
si.append("[");
si.append((Integer) altName.get(0));
si.append("] ");
si.append(name);
si.append("\n");
}
}
} catch (CertificateParsingException e) {
e.printStackTrace();
si.append("<Parsing error: ");
si.append(e.getLocalizedMessage());
si.append(">\n");
}
si.append("\n");
si.append(master.getString(R.string.mtm_connect_anyway));
si.append("\n\n");
si.append(master.getString(R.string.mtm_cert_details));
certDetails(si, cert);
return si.toString();
}
/**
* Extracts the array of SubjectAlt DNS names from an X509Certificate. Returns null if there
* aren't any.
*
* <p>Note: Java doesn't appear able to extract international characters from the SubjectAlts. It
* can only extract international characters from the CN field.
*
* <p>(Or maybe the version of OpenSSL I'm using to test isn't storing the international
* characters correctly in the SubjectAlts?).
*
* @param cert X509Certificate
* @return Array of SubjectALT DNS names stored in the certificate.
*/
public static String[] getDNSSubjectAlts(X509Certificate cert) {
LinkedList subjectAltList = new LinkedList();
Collection c = null;
try {
c = cert.getSubjectAlternativeNames();
} catch (CertificateParsingException cpe) {
// Should probably log.debug() this?
cpe.printStackTrace();
}
if (c != null) {
Iterator it = c.iterator();
while (it.hasNext()) {
List list = (List) it.next();
int type = ((Integer) list.get(0)).intValue();
// If type is 2, then we've got a dNSName
if (type == 2) {
String s = (String) list.get(1);
subjectAltList.add(s);
}
}
}
if (!subjectAltList.isEmpty()) {
String[] subjectAlts = new String[subjectAltList.size()];
subjectAltList.toArray(subjectAlts);
return subjectAlts;
} else {
return null;
}
}