Zbigniew Jędrzejewski-Szmek
1cf9e4e25e
This adds a new cloud IMDS client, that can cover AWS, Azure, GCP, Hetzner imds to varying degrees. Each cloud has this and it's very basic functionality, hence I think it makes sense to add this to systemd. Since the clouds are all different this tries hard to do the abstract common logic in code, but encode the endpoint details, and well-known keys in hwdb, attached to the DMI id device. Why all this? * Efficiency: we can schedule this in the initrd, at the earliest points possible, without unnecessary delays * Robustness: imds is typically slow and/or heavily rate-limited: systemd-imdsd as single entrypoint can deal with that, and provide a reliable, cached interface * Security: the idea is that systemd-imdsd is the only service behing able to access the IMDS HTTP, and the host carries a blackhole route for it otherwise. That way sensitive info can be kept away from clients, and requires polkit auth for access * Simplicity: extraction of systemd's system credentials from IMDS userdata happens with systemd's own infra, and for many usecases that should already be enough. * Measurements: before accepting the IDMS userdata, it can be measured into a PCR, as any other configuration input for the system Fixes: #40763
System and Service Manager
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