make bash use authentication type?

[Jaqui Greenlees]

In a recet discussion about ssh, the ida was put forth
to get opnssh to export a variable that defines the
authentication method used. The idea being to limit
access to su use to only those authenticating through
a public / privat key pairing.

is there any way currently to configure bash to use
this and limit access to su if the authentication is
not through th ky pair, without hurting the
transparency of normal ssh access?

Jaqui

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