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53 lines
2.0 KiB
Plaintext
53 lines
2.0 KiB
Plaintext
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Super is a setuid-root program that offers
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o restricted setuid-root access to executables, adjustable
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on a per-program and per-user basis;
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o a relatively secure environment for scripts, so that well-written
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scripts can be run as root (or some other uid/gid), without
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unduly compromising security.
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Sample uses:
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- to call a script that allows users to use mount(8) on
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cdrom's or floppy disks, but not other devices.
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- to restrict which users, on which hosts, may execute a
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setuid-root program.
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- to allow groups of trusted users (e.g. an "operator" group) complete
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root access to sets of selected commands such as, say, line-printer
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control commands, without giving away access to other commands,
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and with full logging of all commands used.
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Super and sudo
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--------------
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Sudo --
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Sudo allows a permitted user to execute a command as the superuser.
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Its central design philosophy is that each user can be
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trusted when executing certain commands. This is implemented
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by allowing each user to execute the restricted commands for
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which s/he is trusted, without giving access to other restricted commands.
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Super --
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The design philosophy behind super is two-fold:
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(a) some users can be trusted when executing certain commands;
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(b) there are some commands, such as a script to mount CDROM's,
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which you'd like to be safely executable even by users who
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are NOT trusted. Although setuid-root scripts are insecure,
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a good setuid-root wrapper around a sensible non-setuid script
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can be hard to break, and super provides that wrapper so that
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even a non-trusted user can use the scripts.
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In the author's view, the main differences to the administrator are:
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(1) the files that specify valid user/command combinations have
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a different look and feel.
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(2) super provides a safe wrapper for scripts, so that a
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well-written script can be run safely by ordinary
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users without having to actually trust them.
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-- David (obrien@FreeBSD.org)
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