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diff --git a/doc/guix-cookbook.texi b/doc/guix-cookbook.texi index f371364746..af08d4ed54 100644 --- a/doc/guix-cookbook.texi +++ b/doc/guix-cookbook.texi @@ -21,6 +21,7 @@ Copyright @copyright{} 2020 Brice Waegeneire@* Copyright @copyright{} 2020 André Batista@* Copyright @copyright{} 2020 Christine Lemmer-Webber@* Copyright @copyright{} 2021 Joshua Branson@* +Copyright @copyright{} 2022 Maxim Cournoyer* Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or @@ -95,6 +96,7 @@ System Configuration * Auto-Login to a Specific TTY:: Automatically Login a User to a Specific TTY * Customizing the Kernel:: Creating and using a custom Linux kernel on Guix System. * Guix System Image API:: Customizing images to target specific platforms. +* Using security keys:: How to use security keys with Guix System. * Connecting to Wireguard VPN:: Connecting to a Wireguard VPN. * Customizing a Window Manager:: Handle customization of a Window manager on Guix System. * Running Guix on a Linode Server:: Running Guix on a Linode Server. Running Guix on a Linode Server @@ -1380,6 +1382,7 @@ reference. * Auto-Login to a Specific TTY:: Automatically Login a User to a Specific TTY * Customizing the Kernel:: Creating and using a custom Linux kernel on Guix System. * Guix System Image API:: Customizing images to target specific platforms. +* Using security keys:: How to use security keys with Guix System. * Connecting to Wireguard VPN:: Connecting to a Wireguard VPN. * Customizing a Window Manager:: Handle customization of a Window manager on Guix System. * Running Guix on a Linode Server:: Running Guix on a Linode Server @@ -1883,6 +1886,65 @@ guix system image --image-type=hurd-qcow2 my-hurd-os.scm will instead produce a Hurd QEMU image. +@node Using security keys +@section Using security keys +@cindex 2FA, two-factor authentication +@cindex U2F, Universal 2nd Factor +@cindex security key, configuration + +The use of security keys can improve your security by providing a second +authentication source that cannot be easily stolen or copied, at least +for a remote adversary (something that you have), to the main secret (a +passphrase -- something that you know), reducing the risk of +impersonation. + +The example configuration detailed below showcases what minimal +configuration needs to be made on your Guix System to allow the use of a +Yubico security key. It is hoped the configuration can be useful for +other security keys as well, with minor adjustments. + +@subsection Configuration for use as a two-factor authenticator (2FA) + +To be usable, the udev rules of the system should be extended with +key-specific rules. The following shows how to extend your udev rules +with the @file{lib/udev/rules.d/70-u2f.rules} udev rule file provided by +the @code{libfido2} package from the @code{(gnu packages +security-token)} module and add your user to the @samp{"plugdev"} group +it uses: + +@lisp +(use-package-modules ... security-token ...) +... +(operating-system + ... + (users (cons* (user-account + (name "your-user") + (group "users") + (supplementary-groups + '("wheel" "netdev" "audio" "video" + "plugdev")) ;<- added system group + (home-directory "/home/your-user")) + %base-user-accounts)) + ... + (services + (cons* + ... + (udev-rules-service 'fido2 libfido2 #:groups '("plugdev"))))) +@end lisp + +After re-configuring your system and re-logging in your graphical +session so that the new group is in effect for your user, you can verify +that your key is usable by launching: + +@example +guix shell ungoogled-chromium -- chromium chrome://settings/securityKeys +@end example + +and validating that the security key can be reset via the ``Reset your +security key'' menu. If it works, congratulations, your security key is +ready to be used with applications supporting two-factor authentication +(2FA). + @node Connecting to Wireguard VPN @section Connecting to Wireguard VPN |