Hi all, I currently have a MR open against archlinux-keyring [1], that adds a systemd service and timer, which would automatically refresh valid and existing keys on user systems. For people without access to the repository's ticket and merge request features, it is possible to browse the commits in question on the respective branch [2].
To quote from the accompanying ticket [3]: ``` For situations in which we do have new signatures which have been released, we may want a service on user systems that update existing keys via WKD to have an updated set of keys before updating archlinux-keyring. Rationale: Keys are updated in WKD after a release of archlinux-keyring (currently this is still done in the https://gitlab.archlinux.org/archlinux/wkd repo). User systems may upgrade any time after that and pacman will pull new keys from WKD automatically, however it will not pull updates for existing keys. Packages that are signed with a key that still had marginal trust in release A (and therefore already existed on the user system since release A) and gained full trust in release B will not be updated before the user does a system upgrade. This leads to the requirement of installing archlinux-keyring before doing a system upgrade, as otherwise the key will still have marginal trust on the user system and the signatures of other updated packages using the key in question will fail to validate. To remedy this situation I think it would be helpful to have a service update existing keys from WKD twice daily on a timer. I am not 100% sure whether this has side-effects in regards to revocations, but as we only ever update WKD after issuing a release and not when updating the default branch, this should be fine(?). ``` In short: The service in question will update any valid keys in the pacman keyring on user systems, that use Arch Linux's relevant domains as UID to retrieve updated keys (e.g. extended expiration, additional signatures). Invalid keys and those of other domains are ignored. This feature is implemented to circumvent (some, but not all) cases of "update archlinux-keyring before doing a system upgrade". Cases not covered are (in no particular order): * *long* outdated system is updated * new main signing key is required for a packager key to gain full trust for the packages about to be updated * local system's archlinux-keyring does not yet offer this feature * local system's pacman does not yet offer the feature of downloading package signatures for new keys from WKD * packager key on local system does not yet have any main key signatures and would gain full trust with an update of archlinux-keyring Currently the timer which triggers this service is supposed to be vendor enabled (i.e. symlink in /usr/lib/systemd/system/timers.target.wants/) and run daily with a deviation of up to 12h. Members of the DevOps team have raised concerns about the interval as we do not really have a clear picture about how many Arch Linux installations there are world-wide to get numbers on expected median load for this. If you have ideas for improvement or general questions, please direct them at the merge request. Best, David [1] https://gitlab.archlinux.org/archlinux/archlinux-keyring/-/merge_requests/138 [2] https://gitlab.archlinux.org/archlinux/archlinux-keyring/-/tree/wkd_sync_service [3] https://gitlab.archlinux.org/archlinux/archlinux-keyring/-/issues/184 -- https://sleepmap.de
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