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Re: [Acme] http-01 and jws thumbnail

Alan Doherty <ietf@alandoherty.net> Tue, 16 July 2019 18:35 UTC

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Date: Tue, 16 Jul 2019 19:34:18 +0100
To: Stefan Eissing <stefan.eissing@greenbytes.de>, acme@ietf.org
From: Alan Doherty <ietf@alandoherty.net>
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Subject: Re: [Acme] http-01 and jws thumbnail
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i have all the sites 301 redirect .well-known/acme-challenge/ to http://the-one-name-running-acme-client/.well-known/acme-challenge/

thus sites distributed across many physical servers and ones like https://blah.com that normally 301 to https://www.blah.com all validate

At 11:55 16/07/2019  Tuesday, Stefan Eissing wrote:
>A user of my Apache ACME client asked about a feature where the security implications are not clear to me:
>
>- he has several server instances that may receive the CA's http-01 challenge request. He therefore would like all servers to answer to all challenges like the solution proposed by acme.sh: <https://github.com/Neilpang/acme.sh/wiki/Stateless-Mode>
>
>server {
>....
>  location ~ ^/\.well-known/acme-challenge/([-_a-zA-Z0-9]+)$ {
>    default_type text/plain;
>    return 200 "$1.6fXAG9VyG0IahirPEU2ZerUtItW2DHzDzD9wZaEKpqd";
>  }
>
>which sends the thumbnail back to anyone asking. Is this an example to follow? It feels very open...
>
>Thanks,
>
>Stefan
>
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