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- Date: Tue, 4 Feb 86 11:04:50 EST
- >From: Dan Franklin <dan@BBN-PROPHET.ARPA>
-
- I have always felt that the UNIX umask "solution" to the problem of protection
- was inadequate. If I had per-directory protections, then my personal hierarchy
- would be writable only by me (644), except for my mail files which would be
- even more private (600). The source hierarchy I share with others on my
- project would be read-write by the group (664). Since all we have is umask, I
- can't do this. I must set umask to 002 so that when I work on the group source
- hierarchy, others can modify my modifications. I put up with the lessened
- security in other areas because most programs implement various ad-hoc
- solutions--the mail system creates all its files 600, etc. It's not perfect;
- when I use a filter on a message file in one of my MH folders, the output file
- is created group-read-write. But it mostly works.
-
- The cd alias is a clever suggestion, but like umask, it only mostly works.
- Your shell, and the shells of all the other users you ever expect to create
- files in those directories, must have aliases (thus leaving out users of the
- BSD Bourne shell and the System V.1 shell) and it doesn't work with commands
- like "find," which can recurse over a hierarchy and create files (via -exec)
- without ever forking a shell of any kind. Some daemons don't exec shells,
- or only exec the Bourne shell (/etc/rc, for instance).
-
- However, just because umask is inadequate doesn't mean this committee should
- try to fix the problem. This inadequacy is not widely enough recognized to
- justify creating a brand-new scheme in a standards document without testing it.
- Also, the standard would (I think) have to retain umask in its current form;
- and having two ways to do the same thing is always unfortunate. Other
- submitters have also raised good points about compatibility (tar and cpio). So
- much as I like the idea, I think it has to be left for innovators to try
- adding, not for a standard.
-
- [ No one has proposed changing umask in a standards document. -mod ]
-
- Dan
-
- Volume-Number: Volume 5, Number 35
-
-