[Dovecot] don't follow symlinks when creating mailbox list

Timo Sirainen tss at iki.fi
Wed Jun 18 12:38:19 EEST 2008

On Wed, 2008-06-18 at 09:35 +0200, Dan Horák wrote:
> this issue was discussed here twice in the not so far history
> (http://www.dovecot.org/list/dovecot/2008-January/028317.html,
> http://www.dovecot.org/list/dovecot/2008-February/029147.html), but I
> need to open it again as it makes problems for our users on one side and
> on the other side we don't want to diverge from the upstream sources in
> our packages. I agree with Timo that simply disabling the symlink
> following in creating the mailbox list can give a false sense of
> security so the question is whether a permanent solution can be
> developed and how it should look like?

Permanent solution would be to put your mailboxes in a separate
directory where users preferrably don't even have write access, so they
can't create broken symlinks.

Other than that, I see only kludgy solutions.

Although I suppose I could consider including a check that keeps track
of which directories are scanned and stops if it encounters a loop. Is
your problem with loops or just that symlinks point to huge directory
structures outside home dir?

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