Re: Syntax of Subject Alternative Names field in a certificate

Hi Andreas -

You appear to be asking about how to make Openssl issue a cert with an 
SAN.  That's not a topic for this list.

This list is about IETF standards in the Public Key Infrastructure field 
of use.  If you have a question about the ASN1 that goes into making an 
SAN OtherName, that would be more appropriate for this list.

I'd suggest referring your questions to the OpenSSL community, or going 
to the repository and reading the code directly.

Good luck - Mike






On 4/16/2024 8:12 AM, Andreas Maier wrote:
>
> Hi, I am trying to understand what the syntax is for the string value 
> of the Subject Alternative Names field, particularly when it contains 
> multiple entries.
>
> I was hopeful to find that in 
> https://datatracker.ietf.org/doc/html/rfc5280 which as a section 
> 4.2.1.6 
> <https://datatracker.ietf.org/doc/html/rfc5280#section-4.2.1.6> 
> “Subject Alternative Name” but I could not get that out of the syntax 
> description in there. I can find examples which seem to suggest it is 
> a comma-separated list of items, each of which has a type indicator 
> (e.g. “DNS”), as in:|DNS:{hostname1},IP:{ip2},email:{email},URI:{uri4}|
>
> Some sources for the examples:
>
>   * https://www.openssl.org/docs/man1.0.2/man5/x509v3_config.html
>   * https://support.hpe.com/hpesc/public/docDisplay?docId=sf000094754en_us&docLocale=en_US&page=index.html
>     <https://support.hpe.com/hpesc/public/docDisplay?docId=sf000094754en_us&docLocale=en_US&page=index.html>
>   * https://www.linode.com/docs/guides/using-openssls-subjectaltname-with-multiple-site-domains/ use:
>
> Where is the syntax of the Subject Alternative Names field documented 
> in an RFC?
> Are the type indicators mandatory or optional?
>
> Kind regards,
>
> Andy
>
>
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