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Re: Why you should avoid world-writable directories
From: avalon () COOMBS ANU EDU AU (Darren Reed)
Date: Wed, 23 Dec 1998 09:28:35 +1100


In some mail from Ben Laurie, sie said:

D. J. Bernstein wrote:
Certainly setuid programs require a great deal of care. They've been
involved in many security disasters, though far fewer than (for example)
world-writable directories. The security community would love to see
another portable IPC mechanism offering guaranteed user identification.
(I suggest that kernels add a getpeeruid() system call, showing the real
uid that called connect(), for UNIX-domain sockets and for loopback TCP
sockets.) However, while we're waiting, we need a few setuid programs.

What's wrong with the LOCAL_CREDS option on UNIX domain sockets?

In a way, that is exactly the type of thing he is referring to, BUT,
LOCAL_CREDS must be supplied to be received as opposed to just "looked up"
with getpeeruid() (my understanding anyway).

Darren



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