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When configuring SSH to only run inside a given VRF the system can not start
SSHd on bootup as the Kernel will report EPERM (Operation not permitted) when
loading the VRF BPF program. This returns the exit code 255 which is marked
in the systemd unit file to stop restarting the service forever.
Removing this limitation will restart the SSHd on startup and it will live
inside the VRF till the end of days.
(cherry picked from commit cdbac8f10b470a06aff54832da7f006aa3ed194e)
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(cherry picked from commit 57fca79636b783dc4be2df1bc1ff12a0ce79d988)
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Now that b40c52682a256 ("config: T2636: get_config_dict() returns a list on
multi node by default") is implemented the workarounds can be removed.
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Move sshd_config file to /run so it must be generated on every boot and is
not stored accidently.
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When migrating the conf from VyOS 1.2 to 1.3 a configuration error could appear
if the user specified "info" as loglevel instead of "INFO". There was no input
validation done in 1.2 but this is now enforced in 1.3.
In VyOS 1.3 loglevel will be always lowercase on the CLI and when migrating the
config this is transformed. Also VyOS 1.2 accpeted any arbitrary loglevel. If
an invalid loglevel is found it will be set to info.
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Linux tries to bind sshd to the VRF but it is yet not ready - for any arbitrary
reason. After restarting SSH to often (rate-limiting) it is blocked by systemd.
Using Restart/RestartSec is not enough - systemd services use start rate
limiting (enabled by default). If service is started more than StartLimitBurst
times in StartLimitIntervalSec seconds is it not permitted to start any more.
Parameters are inherited from DefaultStartLimitIntervalSec (default 10s) and
DefaultStartLimitBurst (default 5).
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Commit 1d7f88b459d ("ssh: T2635: migrate to get_config_dict()") used a wrong
loop iterator on the rendered ListenAddress statement.
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Jinja template contains some workarounds like {% if port is string %}, this
depends of the resolution of https://phabricator.vyos.net/T2636
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