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- From: carl@SOL1.GPS.CALTECH.EDU (Carl J Lydick)
- Newsgroups: comp.os.vms
- Subject: re: re: Re: HELP!!! Security problem for gurus. [Directories]
- Date: 3 Jan 1993 10:07:11 GMT
- Organization: HST Wide Field/Planetary Camera
- Lines: 29
- Distribution: world
- Message-ID: <1i6dsfINNrct@gap.caltech.edu>
- References: <9301021337.AA28427@uu3.psi.com>
- Reply-To: carl@SOL1.GPS.CALTECH.EDU
- NNTP-Posting-Host: sol1.gps.caltech.edu
-
- In article <9301021337.AA28427@uu3.psi.com>, leichter@lrw.com (Jerry Leichter) writes:
- =Seriously, I have a copy of the ODS-II spec - after all, I *did* work for DEC
- =for 12 years! It's not a particularly secret spec; I know other people have
- =copies, probably more recent ones than mine.
-
- I believe the book is titled _VMS_File_System_Internals, or something like
- that. You can actually go out and buy it these days.
-
- =The easiest way to do it would be to create directories with an access-mode
- =restriction allowing access only from executive (or kernel) modes. When you
- =get down to the bottom level, the only way to access a file is through a
- =channel, and channels have associated access levels. The rule for access-mode
- =restricted files would be that the mode of the channel must be at least as
- =privileged as the mode of the file. User-mode code can only create user-mode
- =channels, so would not be able to get to a directory file directly. This
- =might be enforced by the driver, or I suppose the concept of access-mode
- =restrictions might be extended to cover all devices, in which case it would
- =be enforced by the I/O system in conjunction with the disk drivers.
-
- But remember that you can still get at it if you've got LOG_IO or PHYS_IO priv
- and a copy of _VMS_File_System_Internals.
- --------------------------------------------------------------------------------
- Carl J Lydick | INTERnet: CARL@SOL1.GPS.CALTECH.EDU | NSI/HEPnet: SOL1::CARL
-
- Disclaimer: Hey, I understand VAXen and VMS. That's what I get paid for. My
- understanding of astronomy is purely at the amateur level (or below). So
- unless what I'm saying is directly related to VAX/VMS, don't hold me or my
- organization responsible for it. If it IS related to VAX/VMS, you can try to
- hold me responsible for it, but my organization had nothing to do with it.
-