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Replace links to the phabricator site from https://phabricator.vyos.net to
https://vyos.dev
(cherry-picked form commit bd9416a6aa9d5d0a746dc2cebc8d0330fd27d1a2)
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As of now when adding new credentials for any SNMPv3 user we submit the
credential either plaintext or encrypted. A plaintext credential will be hashed
by SNMPd in the background and then passed back into the CLI so it's not stored
in cleartext. This feels like the wrong way in changing the CLI content with
data produced by a 3rd party daemon which implements the service.
It feels like the tail wiggles the entire dog.
This should be changed in the following way:
- After retrieving the plaintext password from CLI, use Python to hash the key
in advance
- Re-populate the encrypted key into the CLI and drop the plaintext one
- Generate service configuration and continue startup of SNMPd
This also fixes a race condition when SNMPd started up but not properly
provided the hasehd keys in the configuration resulting in a ConfigurationError.
Now as we also support binding SNMPd to a VRF this fixes a deadlock situation
on bootup as we can only bind late to the VRF and require up to 5 restarts of
the service - but the service will never start.
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The SNMPv3 TSM is very complex and I know 0 users of it. Also this is untested
and I know no way how it could be tested. Instead of carrying on dead and
unused code we should favour a drop of it using a proper config migration
script.
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As of the SNMP specification an SNMP engine ID should be unique per device.
To not make it more complicated for users - only use the global SNMP engine ID.
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