[OpenAFS] home on afs woes

[Jeffrey Altman]

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This should be a reasonable approach.   For all machines that
are being logged into using gssapi krb5, those machines must
have been issued a Kerberos principal and they must have a
keytab.  Assign the principal an AFS ID and then use a program
such as kstart to obtain and maintain a AFS token in the PAG
within which the sshd resides.  Add the AFS ID to a an AFS
group and provide that group rl privileges on the top level
directory of the home volume.   This will provide the sshd
the ability to read the directory without requiring that the
directory be world readable.

Now if you want to lock things down a bit more, move all of
the dot files to a new directory on which 'rl' is granted
for the group and instead give the group 'l' privilege on
the top-level directory and place symlinks from the top-level
directory to the real dot files.   This will prevent sshd
from being able to read any of the files in the top-level
directory but it will be able to follow the symlinks to
read the dot files that it requires.

Jeffrey Altman


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