This was also raised for (hopefully) wider discussion on the IETF mailing list.

Done for master and 2.2.

Fix will be in 2.2.17

@dkg I believe @aheinecke gave the GpgOL description just as an example of why WKD-first retrieval would be beneficial (for details of that see https://wiki.gnupg.org/AutomatedEncryption#Trust_Levels) and I believe this ticket is a follow-up to my question on gnupg-devel ML: https://lists.gnupg.org/pipermail/gnupg-devel/2019-June/034372.html

auto-key-retrieve happens in the context of signature verification when the certificate is missing. If no signer User ID subpacket is present in the signature, then WKD simply won't work.

I did some manual tests using netcat and KS_FETCH to test the redirection.

I think you're suggesting accepting *any* path if the hostname of the proposed redirection matches openpgpkey.example.org when querying the WKD direct URL for an @example.org address. That would also be a fine solution from my point of view.

I head the same idea when I read your configuration. Given that the advanced lookup was not reallydeployed (see T4590) I also expect that we will receive complains now that it works. Thus white listing any "openpgpkey." seems to me a reasonable easy solution.

Will be in 2.2.17

Oh dear, that happens if one is always on master. I simply forgot to cherry pick the change from master back in November.
Two commits, though.

@werner, thanks for the pointer to the report, that's certainly useful. And i'm happy that organizations like SektionEins are doing GnuPG audits and publishing their results regardless of who paid for them.

See https://sektioneins.de/en/blog/18-11-23-gnupg-wkd.html for details. In short they fear that companies using IP based security for internal services can be attacked via redirect request and in particular becuase that can happen in the background without the user noticing. I am not concerned but we had long lasting discussions also with protonmail about this and the result was that we need to have this protection. We do not know who requested and paid for the audit from SektionEins and they won't tell us.

Thanks for the pointer, @werner. Certainly we want T4590 fixed.

We need to rewrite the Location to avoid a CSRF attack. See fa1b1eaa4241ff3f0634c8bdf8591cbc7c464144

I recognize that adding network activity to the test suite can be complicated (not all test suites are run with functional network access), but if it is possible to have a unit test or something (that doesn't do network access, but just looks at what the dirmngr *would* have tried somehow?), that would be great. Thanks for looking into this!

Confirmed; that looks like a regression.

Sounds good! I give it to me for testing / documenting this.

With master we can now do:

@werner Be my guest.

Why not using PowerShell? Because --with-colons does not output the required hash? But that can't be the reason because Python has the very same problem. Using Python for scripts is anyway a bit of overkill.

Precondition: A list of pubkeys, as keyring or as keyring file with list of fingerprints.
Goal: a static file structure that can be uploaded on my webserver.
Platform: Windows, a better solution does require less additional dependencies apart from Gpg4win.

... that would be useful in many ways. I'd say we should support anyone who wants to use pythong-gnupg on windows.

@werner it is like @aheinecke writes:

As I see it Bernhard is just asking for the flat strucuture so basically some export script that creates the needed files on windows.

If they really want to do that for Windows, they can use some database approach like Protonmail does it. This does not require any file structure.

Sorry, we won't implement a server for WIndows. No sane provider uses Windows for a large mail setup.