I had a thought on this....
It seems you are trying to provide the "floppy model" that users
currently have with their PCs.
User A writes the floppy, User B can read it and do whatever he
wants...
(I know this is Apple - but I'll stick to MSDOS for the discussion,
and "floppy" indicates any removable media.)
The reason for this is that MSDOS filesystems don't keep any
user credentials. So, use B can read anything on any floppy
he can find.
Wouldn't creating a file system that didn't support user
credentials solve your problem? Format the floppy in that
file system and hand it to user B. When user B mounts it,
he can do whatever he wants. User A is aware of how the
floppy was created, as presumably some special step is
required to create the "discard credential" file system
on the floppy.
Perhaps, such a file system could even be a UFS with a
special marker somewhere? Then, this marker could be "twiddled"
after the fact. For example, user A formats and makes
a new UFS file system on the floppy, and copies the files
over. Marks it as having no credentials (twiddles the bit)
and hands it to user B. User B mounts it, with a regular
UFS mount - but because the magic bit is "twiddled" GID
and UID are ??? (here's where things break down, just what
do you use for those? root/nobody/user's gid&uid?)
Just some thoughts...
- Dave Rivers -
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