doc: cookbook: Document the configuration of a Yubikey with KeePassXC.

* doc/guix-cookbook.texi (Using security keys)
[Requiring a Yubikey to open a KeePassXC database]: New subsection.

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Maxim Cournoyer 2023-08-17 10:32:47 -04:00
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@ -2158,6 +2158,51 @@ the @code{yubikey-manager-qt} package and either wholly disable the
@samp{Applications -> OTP} view, delete the slot 1 configuration, which
comes pre-configured with the Yubico OTP application.
@subsection Requiring a Yubikey to open a KeePassXC database
@cindex yubikey, keepassxc integration
The KeePassXC password manager application has support for Yubikeys, but
it requires installing a udev rules for your Guix System and some
configuration of the Yubico OTP application on the key.
The necessary udev rules file comes from the
@code{yubikey-personalization} package, and can be installed like:
@lisp
(use-package-modules ... security-token ...)
...
(operating-system
...
(services
(cons*
...
(udev-rules-service 'yubikey yubikey-personalization))))
@end lisp
After reconfiguring your system (and reconnecting your Yubikey), you'll
then want to configure the OTP challenge/response application of your
Yubikey on its slot 2, which is what KeePassXC uses. It's easy to do so
via the Yubikey Manager graphical configuration tool, which can be
invoked with:
@example
guix shell yubikey-manager-qt -- ykman-gui
@end example
First, ensure @samp{OTP} is enabled under the @samp{Interfaces} tab,
then navigate to @samp{Applications -> OTP}, and click the
@samp{Configure} button under the @samp{Long Touch (Slot 2)} section.
Select @samp{Challenge-response}, input or generate a secret key, and
click the @samp{Finish} button. If you have a second Yubikey you'd like
to use as a backup, you should configure it the same way, using the
@emph{same} secret key.
Your Yubikey should now be detected by KeePassXC. It can be added to a
database by navigating to KeePassXC's @samp{Database -> Database
Security...} menu, then clicking the @samp{Add additional
protection...} button, then @samp{Add Challenge-Response}, selecting the
security key from the drop-down menu and clicking the @samp{OK} button
to complete the setup.
@node Dynamic DNS mcron job
@section Dynamic DNS mcron job