QSslCertificate not populating Subject Alternative Names

jeremiah

I am getting SSL Handshake Errors making a request due to the SAN not being read from the certificate. In the on_SSLErrors, I dump out the peer certificate. using cert.toPem(), I decode it at https://www.sslshopper.com/certificate-decoder.html. This shows the Subject Alternateive Names. But in the cert in QT, I get an empty map from cert.subjectAlternativeNames().

my dumpCert function:

void MyRequest::dumpCertificate( const QSslCertificate &cert )
{
qDebug() << cert.toPem();

qDebug() << "== Subject Info ==\b";
qDebug() << "CommonName: " << cert.subjectInfo( QSslCertificate::CommonName );
qDebug() << "Organization: " << cert.subjectInfo( QSslCertificate::Organization );
qDebug() << "LocalityName: " << cert.subjectInfo( QSslCertificate::LocalityName );
qDebug() << "OrganizationalUnitName: " << cert.subjectInfo( QSslCertificate::OrganizationalUnitName );
qDebug() << "StateOrProvinceName: " << cert.subjectInfo( QSslCertificate::StateOrProvinceName );

QMultiMap<QSsl::AlternativeNameEntryType, QString> altNames = cert.subjectAlternativeNames();
if ( !altNames.isEmpty() ) {
    qDebug() << "Subject Alternate Names (DNS):";
    foreach (const QString &altName, altNames.values(QSsl::DnsEntry)) {
        qDebug() << altName;
    }

    qDebug() << "Alternate Subject Names (Email):";
    foreach (const QString &altName, altNames.values(QSsl::EmailEntry)) {
        qDebug() << altName;
    }
}
else {
    qDebug() << "No Subject Alternate Names";
}


qDebug() << "\n== Issuer Info ==";
qDebug() << "CommonName: " << cert.issuerInfo( QSslCertificate::CommonName );
qDebug() << "Organization: " << cert.issuerInfo( QSslCertificate::Organization );
qDebug() << "LocalityName: " << cert.issuerInfo( QSslCertificate::LocalityName );
qDebug() << "OrganizationalUnitName: " << cert.issuerInfo( QSslCertificate::OrganizationalUnitName );
qDebug() << "StateOrProvinceName: " << cert.issuerInfo( QSslCertificate::StateOrProvinceName );

qDebug() << "\n== Certificate ==";
qDebug() << "Serial Number: " << cert.serialNumber(); 
qDebug() << "Effective Date: " << cert.effectiveDate().toString();
qDebug() << "Expiry Date: " << cert.expiryDate().toString();
}

jeremiah

Parsing the extensions I get:

DEBUG 2015-09-18T10:52:21.234 "Exentensions: 4"
DEBUG 2015-09-18T10:52:21.234 ""basicConstraints" IsSupported: true"
DEBUG 2015-09-18T10:52:21.234 ""keyUsage" IsSupported: false"
DEBUG 2015-09-18T10:52:21.234 ""extendedKeyUsage" IsSupported: false"
DEBUG 2015-09-18T10:52:21.234 ""subjectAltName" IsSupported: false"

So this means that Subject Alternative Names isn't supported. How do I enable support for this?

jeremiah

It seems that the SAN in the cert looks like this:

Subject Alternative Names: IP Address:127.0.0.1, IP Address:10.8.0.1, IP Address:174.36.209.157

Could it be that it isn't returning anything because

QMultiMap<QSsl::AlternativeNameEntryType, QString> altNames = cert.subjectAlternativeNames();

Is expecting one of these:

enum AlternativeNameEntryType {
    EmailEntry,
    DnsEntry
};

jeremiah

I downloaded their source to see how they were populating the SAN stuff. Apparently, they only populate it if it is a DNS or Email entry. I found a sample cert online to parse to test this. I was right:

DEBUG 2015-09-18T12:34:04.894 "Subject Alternate Names (DNS):" 
DEBUG 2015-09-18T12:34:04.897 "\"uat-apas.sait.ca\"" 
DEBUG 2015-09-18T12:34:04.897 "\"uat-integration.sait.ca\"" 
DEBUG 2015-09-18T12:34:04.898 "\"cp-uat.sait.ca\"" 
DEBUG 2015-09-18T12:34:04.898 "\"cp.sait.ca\"" 
DEBUG 2015-09-18T12:34:04.898 "\"sait.ca\"" 
DEBUG 2015-09-18T12:34:04.898 "\"*.sait.ca\"" 
DEBUG 2015-09-18T12:34:04.898 "Alternate Subject Names (Email):"

Thoughts? Do I just add the IP as a DNS entry in our certs?

jeremiah

I added the IP address to a DNS entry in the SAN. I no longer get the SSLHAndShake errors.

Nominate our 2022 Qt Champions!

QSslCertificate not populating Subject Alternative Names