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Old 01-04-2009, 03:39 PM
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Chief Technician Chief Technician is offline
Join Date: Dec 2001
Location: NYC
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Thumbs up Re: I'd may need a max expert for this, I think - (re security)

You can do what you want to. The question will be how difficult it is to do given with what you already have.

The first thing you will have to do is Get Info on each volume, from each OS, and make certain that you are not ignoring ownership on each volume. Enabling Ignore Ownership for this Volume will make the volumes more easily browsed, if not outright compromised.

The second thing you have to do is understand a bit about how user accounts work in OS X. If you have a user account named eddydee, the OS does not use that name to determine what eddydee can and cannot access. What the OS does is map the name eddydee to a user ID (uid). If eddydee were the first user account created in the OS, then the uid would be 501.

This is important because each OS is going to use the uid, not the user name, to determine what the user can and cannot access. So you could have a user eddydee with a uid of 501 in Panther, and a user eddydee with a uid of 502 in Tiger, and find yourself saying "Eddydee owns these files! Why can't I access them?!"

So, presuming you have everything already setup in each OS, you need to verify that all the user accounts in each OS have the same uid. If they do, you are set. If not, you have work to do that goes beyond the scope of posting it on the DUC. To check uid's, use NetInfo Manager, located in Macintosh HD/Applications/Utilities/. When you launch NetInfo Manager, choose "users" from the middle column. In the right column, locate the user account you need to check and click on it. In the section beneath the three (3) columns, scroll down until you find "uid" in the "Property" column, then look in the "Value(s)" column to see what the user account's uid is.

If all of the user accounts and their corresponding uid's are identical in each OS, you will not have a problem with securing your files, provided the files you want to secure are located in the user's home directory, which is Macintosh HD/Users/<name of user>/, and you are not ignoring ownership on the volume.
Jonathan S. Abrams, CEA, CEV, CBNT
Apple Certified - Technical Coordinator (v10.5), Support Professional (v10.6 through v10.10)
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