3.0.4 release candidate 2

Stefan Winter stefan.winter at restena.lu
Fri Aug 29 08:15:23 CEST 2014


>> looking a the code inside rad_mkdir, it realises that the directory
>> exists, but then tries a chmod() with hard-wired permissions to 0700
>> (rlm_linelog.c harwired this value) (why?) which fails (why, I don't
>> know, I'm root after all).
>   SELinux?

No, turned out that the directory is owned by root, but the attempt at
chmod() was after radiusd dropped its UID/GID to the non-privileged

In effect, radiusd at runtime forces the log dir to have same owner that
is also the uid/gid of the daemon (else calling chmod() is not
authorized); and it scrubs any changes to in permissions which an admin
may do on the filesystem himself.

Even if the same-ownership is the default on many installations, and 755
is probably defaulty as well, enforcing that silently in code is a
significant behaviour change (and none I see in the Changelog even).

Not what I expected in a patchlevel update anyway.

>> That chmod() wasn't done in earlier versions; used stat() and returned 0
>> without making a fuss.
>   It's an attempt at security.  If the call to rad_mkdir() says that the
> directory should be 0755, then the directory should be set to that.
>   I've pushed a fix.

Hm. If the admin thinks otherwise, shouldn't his will be respected?

Also, the fix looks misplaced? I think it's the chmod() here:

	if (rcode < 0) {
		if (errno == EEXIST) {
			return chmod(directory, mode);

The directory exists, so this is the code path with the "strange" chmod().

Your change doesn't do the chmod() on actual newly created directories.
I believe that *there* it makes sense to keep the chmod() because you'll
be populating something that didn't exist before with a sane default.

At the other place, you're changing things an admin did without asking him.


Stefan Winter

>   Alan DeKok.
> -
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