Date: Wed, 5 Feb 1997 11:00:12 +0100 (MET) From: W.Belgers@nl.cis.philips.com (Walter Belgers) To: freebsd-hackers@freebsd.org Subject: Re: NIS/uids Message-ID: <199702051000.LAA27316@giga.lss.cp.philips.com> In-Reply-To: <199702042306.QAA13339@phaeton.artisoft.com> from Terry Lambert at "Feb 4, 97 04:06:53 pm"
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Terry Lambert writes: > > > The problem now is that the security on my system has become dependant > > > on that of the NIS server. If I am root on the NIS server I can change > > > the uid of "user" into any user including root and make use of it on my > > > system. > > > It makes sense to me that "sensitive" user and group ID's perhaps > should not be honored when they come in via NFS... ie: user root > or bin, etc., or group bin or kmem. This has turned out to become a discussion about whether or not you should trust your NIS server, but that's not what I wanted to know. Let's assume I do not trust the uid's coming from the NIS server but I still do want to use NIS (for passwd/homedir/gecos/whatever). Why does FreeBSD give me troubles when I override the uid in the local password file? a) taking uid from NIS: [/] root@giga# grep john /etc/master.passwd +john:::::0:0:John Doe:/home/john:/usr/local/bin/tcsh [/] root@giga# ypmatch john passwd john::1234:1234:John Doe:/home/john:/bin/tcsh [/] root@giga# su - john > id uid=1234(john) gid=1234 groups=1234 > from >From walter Wed Feb 5 09:49:57 1997 > b) overriding the uid: [/] root@giga# grep john /etc/master.passwd +john::1234:1234::0:0:John Doe:/home/john:/usr/local/bin/tcsh [/] root@giga# ypmatch john passwd john::1234:1234:John Doe:/home/john:/bin/tcsh [/] root@giga# su - john > id uid=1234 gid=1234 groups=1234 > from from: no password file entry for you. > Walter. -- Ir. W.H.B. Belgers, Internet Security Specialist phone: +31 40 2782753 Origin IT Syst.Man. /Nederland bv, Bldg VN-513 email: fax: +31 40 2784697 P.O. Box 218, 5600 MD Eindhoven, Netherlands W.Belgers@nl.cis.philips.com non-business-email: walter@giga.nl -web: http://www.IAEhv.nl/users/gigawalt
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