I bought a wildcard certificate for *.example.com. Now, I have to secure *.subdomain.example.com. Is it possible to create a sub-certificate for my wildcard-certificate?
If it is, how I can do this?
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Also see How do you sign Certificate Signing Request with your Certification Authority and How to create a self-signed certificate with openssl? You will also need to place the self-signed certificate in the appropriate trust store.– jwwAug 7, 2017 at 22:27
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4 Answers
No, it is not possible. A wildcard inside a name only reflects a single label and the wildcard can only be leftmost. Thus *.*.example.org or www.*.example.org are not possible. And *.example.org will neither match example.org nor www.subdomain.example.org, only subdomain.example.org.
But you can have multiple wildcard names inside the same certificate, that is you can have *.example.org and *.subdomain.example.org inside the same certificate.
answered Nov 4, 2014 at 20:52
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2I think this post complement this answer about multi level wildcard: Can You Create A Wildcard SSL Certificate For Two Levels? Oct 25, 2019 at 6:44
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But you can have multiple wildcard names inside the same certificate – it would be helpful to add which certificate's field you have in mind;
Common NameorSubject Alternative Name? Oct 13, 2023 at 7:58 -
@PiotrDobrogost: Common Name is irrelevant today, Everything is done with Subject Alternative Names. Oct 13, 2023 at 8:14
It is impossible to secure multi-level subdomains with a single wildcard certificate. If wildcard certificate issued for *.mydomain.tld, so it can secure only first-level subdomains of *.mydomain.com.
To secure your second-level subdomains, you have two choices.
Purchase another wildcard certificate for *.sub1.mydomain.tld. In that case, you need to manage two individual wildcard certificates.
You can go with a multi-domain wildcard certificate, where you can add up to 100 multiple domains or subdomains.
For example,
- *.mydomain.tld
- *.sub1.mydomain.tld
- *.sub2.mydomain.tld
- *.anydomain.com
It will secure your multiple domains and multi-level subdomains and reduce your hassle from multiple certificate management.
As per 7 year old article at https://www.digicert.com/news/2010-9-1-new-wildcard-features/ :
DigiCert Wildcard Plus certificates can secure any subdomain using subject alternative names (SANs). A traditional wildcard certificate for *.example.com will only secure a first-level subdomain of example.com such as mail.example.com. DigiCert’s Wildcard Plus certificate uses SANs to secure any subdomain of example.com, including multi-level subdomains such as mail.internal.example.com. With this new feature, all subdomains can be secured with a single Wildcard Plus certificate from DigiCert. The base domain itself, example.com, is automatically included as a SAN in every Wildcard Plus certificate as well, which increases compatibility and protects example.com with or without the “www.”
No, You can't create sub-certificate for your wildcard.
-> Your wildcard Certificate is for *.mydomain.tld, so as per Wildcard SSL guideline you can secure first level sub-domains. Means anything.mydomain.tld can be secured.
-> But if you want to use it to secure *.subdomain.mydomain.tld, which is for second level sub-domains, but wildcard certificate cant secure second level sub-domains.
Solution
-> You need to buy one more wildcard SSL Certificate for your second level sub-domain *.subdomain.mydomain.tld