[tor-relays] Issues with offline master key functionality

[Riccardo Mori <patacca@xxxxxxxxxxxxx>]

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Hi everyone,

Two months ago I decided to try the new ed25519 key introduced in Tor
2.7 with OfflineMasterKey set so I can keep the master key in a
different place and just upload the medium-term signing key every month.
Last month everything went ok: I renewed the key and Tor accepted it.
This time instead after generating the new signing key with

# tor --datadirectory path_to_my_master_key --signingkeylifetime '1
months' --keygen

and uploading ed25519_signing_cert and ed25519_signing_secret_key and
fixing the permission, Tor keep saying


Feb 03 07:27:40.000 [notice] It looks like I need to generate and sign
a new medium-term signing key, because the one I have is expired. To
do that, I need to load the permanent master identity key.
Feb 03 07:27:40.000 [warn] We needed to load a secret key from
/var/lib/tor/keys/ed25519_master_id_secret_key, but couldn't find it.
Did you forget to copy it over when you copied the rest of the signing
key material?
Feb 03 07:27:40.000 [warn] Can't load master identity key;
OfflineMasterKey is set.
Feb 03 07:27:40.000 [err] Error initializing keys; exiting


That raises two questions to me:
  - why does Tor think the new keys are already expired?
  - why is Tor searching ed25519_master_id_secret_key? With
OfflineMasterKey set it shouldn't care about the master secret key


Thank you,
patacca
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