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Re: [Add] Relaxed validation and delegated IPv6 prefixes (Was: New Version Notification for draft-schwartz-add-ddr-forwarders-00.txt)

tirumal reddy <kondtir@gmail.com> Thu, 14 October 2021 10:29 UTC

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From: tirumal reddy <kondtir@gmail.com>
Date: Thu, 14 Oct 2021 15:59:15 +0530
Message-ID: <CAFpG3gc9UhYT1Zd5QbbTuMmKLDoceCMEsHYhdhcANXfesS+_GQ@mail.gmail.com>
To: Ben Schwartz <bemasc=40google.com@dmarc.ietf.org>
Cc: "STARK, BARBARA H" <bs7652@att.com>, ADD Mailing list <add@ietf.org>
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Subject: Re: [Add] Relaxed validation and delegated IPv6 prefixes (Was: New Version Notification for draft-schwartz-add-ddr-forwarders-00.txt)
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On Wed, 13 Oct 2021 at 20:57, Ben Schwartz <bemasc=
40google.com@dmarc.ietf.org> wrote:

>
>
> On Mon, Oct 11, 2021 at 9:09 AM STARK, BARBARA H <bs7652@att.com> wrote:
>
>>
>>
>> *From:* Ben Schwartz <bemasc@google.com>
>>
>> In DDR, the Encrypted Resolver must hold a certificate that covers the IP
>> address of the Unencrypted Resolver unless the resolvers have the same IP.
>> Thus, if the gateway uses a public IP address, and is actually a forwarder,
>> then the upstream resolver must return a certificate that covers the
>> gateway's IP address.
>>
>>
>>
>> <bhs2> Oh good! So by “covers”, do you think it would be acceptable to
>> have the certificate contain the IPv6 prefixes AT&T uses to delegate
>> prefixes to wireline customers? Like 2600:1700::/28 and 2602:300::/24?
>>
>
> In principle, yes.  X.509 doesn't seem to support IP ranges (or IP
> wildcards) in subjectAltName, but I think someone could write a draft to
> enable that.
>

It is already covered https://datatracker.ietf.org/doc/html/rfc8738. ACME
IP identifier validation extension discusses how to get a certificate with
a public IP address. I hope CA like letsencrypt will soon support this
extension.

Cheers,
-Tiru


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