Re: Hard Links between UNIX Utility Programs

Article View: comp.bugs.4bsd

Article #1091

#1091

From: Chris Torek
Date: Wed, 27 Jul 1988 03:13

20 lines
1465 bytes

It is not broken; please do not `fix' it.  If the goal is to prevent
programs from running with arbitrary arguments (including argv[0]),
then do that (via the available protection mechanisms, such as
groups).  For instance, if students should not be allowed remote
access to arbitrary hosts:

	% ls -lg /usr/ucb/rsh /usr/ucb/rlogin
	-rwsr-x---  1 root     ins         30720 Mar 15 11:31 /usr/ucb/rlogin
	-rwsr-x---  1 root     ins         28672 Sep  2  1987 /usr/ucb/rsh
	% ls -lg local_host
	-rwxr-sr-x  1 bin      ins        <size> <date, time> local_host
	% ls -l local_host remote_host
	lrwxrwxrwx  1 bin        12 Jun 11 04:13 remote_host -> /usr/ucb/rsh

where `local_host' is a link to a program that makes sure the arguments
are to be allowed to students, then runs /usr/ucb/rsh, and where `ins'
is a group that excludes students.
-- 
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7163)
Domain:	chris@mimsy.umd.edu	Path:	uunet!mimsy!chris

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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!lll-winken!lll-tis!ames!ncar!oddjob!mimsy!chris

References: <184@chip.UUCP> <2950@ci.sei.cmu.edu> <27498@bbn.COM>

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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!lll-winken!lll-tis!ames!ncar!oddjob!mimsy!chris
From: chris@mimsy.UUCP (Chris Torek)
Newsgroups: comp.bugs.4bsd,comp.bugs.misc,comp.bugs.sys5
Subject: Re: Hard Links between UNIX Utility Programs
Keywords: unix links bsd sysv sys5
Message-ID: <12686@mimsy.UUCP>
Date: 27 Jul 88 03:13:20 GMT
References: <184@chip.UUCP> <2950@ci.sei.cmu.edu> <27498@bbn.COM>
Organization: U of Maryland, Dept. of Computer Science, Coll. Pk., MD 20742
Lines: 19

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