On Wed, 2001-12-12 at 10:35, Brett Simpson wrote:
> Is there a way to use tar with a tape drive as an unprivileged user? As root I can do a backup using "tar -vclpf /dev/st0 /export/data" and a restore using "tar -vxpf /dev/st0". The goal is to be able to do a restore or backup as non-root but to not be able to overwrite any files that a non privileged user wouldn't have rights to. So I don't want to make tar setuid. Maybe set broader rights to /dev/st0?
That's exactly it. Making tar setuid-root would allow anyone to use tar
to overwrite any file on the system as if they were root. You probably
don't want that. :)
Make a group called "backup" and 'chgrp backup /dev/st0' and 'chmod g+rw
/dev/st0'
then put the users you want to be able to take backups into the 'backup'
group. Like magic.
--
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
#!/usr/bin/perl -w
$_='while(read+STDIN,$_,2048){$a=29;$b=73;$c=142;$t=255;@t=map
{$_%16or$t^=$c^=($m=(11,10,116,100,11,122,20,100)[$_/16%8])&110;
$t^=(72,@z=(64,72,$a^=12*($_%16-2?0:$m&17)),$b^=$_%64?12:0,@z)
[$_%8]}(16..271);if((@a=unx"C*",$_)[20]&48){$h=5;$_=unxb24,join
"",@b=map{xB8,unxb8,chr($_^$a[--$h+84])}@ARGV;s/...$/1$&/;$d=
unxV,xb25,$_;$e=256|(ord$b[4])<<9|ord$b[3];$d=$d>>8^($f=$t&($d
>>12^$d>>4^$d^$d/8))<<17,$e=$e>>8^($t&($g=($q=$e>>14&7^$e)^$q*
8^$q<<6))<<9,$_=$t[$_]^(($h>>=8)+=$f+(~$g&$t))for@a[128..$#a]}
print+x"C*",@a}';s/x/pack+/g;eval
usage: qrpff 153 2 8 105 225 < /mnt/dvd/VOB_FILENAME \
| extract_mpeg2 | mpeg2dec -
http://www.cs.cmu.edu/~dst/DeCSS/Gallery/
http://www.eff.org/ http://www.anti-dmca.org/
This archive was generated by hypermail 2.1.3 : Fri Aug 01 2014 - 20:10:59 EDT