Serve available pubkeys lazily #6
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Previously the server read every --ssh-pubkey-file at startup and refused to boot if any was missing. In Flashbox this pinned the pubkey server behind a key that only exists once an encrypted disk is unlocked, so the server (and the attested channel in front of it) was unavailable until after an unattested first SSH connection had already been made (TOFU). Read the configured pubkey files lazily on each request and serve whatever subset is currently available at /pubkey, skipping files that are missing or not yet readable. A key that only appears after startup is then served as soon as it exists, with no restart. /pubkey responds 503 when no key is available yet. Also guard readAndFormatPubkey against empty/half-written files so a partial read is skipped instead of panicking.
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Ruteri
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Jun 10, 2026
MoeMahhouk
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📝 Summary
Previously the server read every
--ssh-pubkey-fileat startup and refusedto boot if any was missing. In Flashbox this pinned the pubkey server
behind a key that only exists once an encrypted disk is unlocked, so the
server (and the attested channel in front of it) was unavailable until
after an unattested first SSH connection had already been made (TOFU).
Read the configured pubkey files lazily on each request and serve whatever
subset is currently available at
/pubkey, skipping files that are missingor not yet readable. A key that only appears after startup is then served
as soon as it exists, with no restart.
/pubkeyresponds 503 when no key isavailable yet.
Also guard readAndFormatPubkey against empty/half-written files so a
partial read is skipped instead of panicking.
📚 References
✅ I have run these commands
make lintmake testgo mod tidy