Date: Mon, 8 Apr 2002 11:37:38 -0700 (PDT) From: Doug White <dwhite@resnet.uoregon.edu> To: =?ISO-8859-2?Q?Pawe=B3_Jakub_Dawidek?= <nick@garage.freebsd.pl> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: Hardlinks... Message-ID: <20020408113423.Y81506-100000@resnet.uoregon.edu> In-Reply-To: <20020408200034.C5952@garage.freebsd.pl>
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On Mon, 8 Apr 2002, [ISO-8859-2] Paweł Jakub Dawidek wrote: > Simple example why I think that only owner should have permission to create > hardlinks to his files. > > First. > leila:root:~# ls -l /root/very-secret-file > -rw------ 1 root wheel 3011 13 Lut 16:47 /root/very-secret-file > > leila:evil-hacker:~> ln /root/very-secret-file ~/whatsthis > > <I need remove it fast!!!> > leila:root:~# rm -f /root/very-secret-file I see you forgot to 'ls -l' the resultant link ... you'll find that it has the same permissions and ownership as the original file. Oops. (this is not a great example. I've rearranged the commands for illustration purposes which is why the history #s bounce around.) wade,ttyp3,~,11>id uid=1000(dwhite) gid=1000(dwhite) groups=1000(dwhite), 0(wheel), 5(operator), 68(dialer), 88(mysql), 998(cvs) wade,ttyp3,~,17>ls -l /root/bin total 2 -rwxr-xr-x 2 root wheel 186 Feb 14 2001 copykeys.sh* -rwxr-xr-x 1 root wheel 186 Feb 15 2001 copykeysfd.sh* wade,ttyp3,~,13>ln /root/bin/copykeys.sh foobaz.sh wade,ttyp3,~,15>ls -l foobaz.sh -rwxr-xr-x 2 root wheel 186 Feb 14 2001 foobaz.sh* wade,ttyp3,~,16>ls -l /root/bin/copykeys.sh -rwxr-xr-x 2 root wheel 186 Feb 14 2001 /root/bin/copykeys.sh* Doug White | FreeBSD: The Power to Serve dwhite@resnet.uoregon.edu | www.FreeBSD.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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