Subject: Config variable for default ccache directory

Currently the default ccache directory is hardcoded to be /tmp on Unix-
like platforms:

    snprintf(name_buf, name_size, "FILE:/tmp/krb5cc_%ld", (long)
getuid());

Zaar Hai has requested that this variable be configurable via krb5.conf.
An example use case would be to choose a directory which is mounted on a
memory filesystem (if for some reason /tmp needs to be on real disk), in
order to ensure that ccaches do not survive a reboot.

Mailing list thread at:

http://mailman.mit.edu/pipermail/kerberos/2010-October/016634.html

Subject: Re: [krbdev.mit.edu #6803] Config variable for default ccache directory 
From: Ken Raeburn <raeburn@MIT.EDU>
Date: Fri, 15 Oct 2010 03:00:59 -0400
To: rt@krbdev.mit.edu
RT-Send-Cc: 

Implementing this change would also be a good time to allow setting of the default
ccache type -- or the default name-including-type, which is different -- so that a
system can be switched to default to keyring ccaches, for example.

A tougher one would be coming up with a mechanism to recommend for sshd, pam, login,
and the like to use to generate a new ccache name with a system-wide default type
specified in a config file, which may have different type-specific ways of
incorporating pty names, session ids, randomly generated strings, etc.  Currently, I
believe changing the default ccache type for a system means hacking multiple remote-
access programs separately?

Ken