[Acme] http-01 and jws thumbnail

Stefan Eissing <stefan.eissing@greenbytes.de> Tue, 16 July 2019 10:55 UTC

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From: Stefan Eissing <stefan.eissing@greenbytes.de>
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Date: Tue, 16 Jul 2019 12:55:30 +0200
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Subject: [Acme] http-01 and jws thumbnail
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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