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Operating Systems Linux Please explain setuid bit clearly! Post 302601893 by agama on Friday 24th of February 2012 05:38:57 PM
Old 02-24-2012
The euid in this case would be root (0) and the uid would be the users real id (500). Some programmes check this and if they are not the equal they stop.

I just found a system with iptables installed and tried it. Without the suid bit on, it does fail with an error, but it was successful when I flipped suid on, so I don't think it is doing what I suggested.

Something that I noticed when I set the permissions is that iptables is actually a sim link that points to iptables-multi. Is this the case in your environment? If so, did you try setting the suid bit on iptables-multi as it doesn't make sense to set it on the simlink (chmod shouldn't allow it anyway).

Not sure what else to suggest.
 

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IPTABLES-SAVE(8)                                                  iptables 1.6.1                                                  IPTABLES-SAVE(8)

NAME
iptables-save -- dump iptables rules to stdout ip6tables-save -- dump iptables rules to stdout SYNOPSIS
iptables-save [-M modprobe] [-c] [-t table] ip6tables-save [-M modprobe] [-c] [-t table] DESCRIPTION
iptables-save and ip6tables-save are used to dump the contents of IP or IPv6 Table in easily parseable format to STDOUT. Use I/O-redirect- ion provided by your shell to write to a file. -M, --modprobe modprobe_program Specify the path to the modprobe program. By default, iptables-save will inspect /proc/sys/kernel/modprobe to determine the exe- cutable's path. -c, --counters include the current values of all packet and byte counters in the output -t, --table tablename restrict output to only one table. If not specified, output includes all available tables. BUGS
None known as of iptables-1.2.1 release AUTHORS
Harald Welte <laforge@gnumonks.org> Rusty Russell <rusty@rustcorp.com.au> Andras Kis-Szabo <kisza@sch.bme.hu> contributed ip6tables-save. SEE ALSO
iptables-apply(8),iptables-restore(8), iptables(8) The iptables-HOWTO, which details more iptables usage, the NAT-HOWTO, which details NAT, and the netfilter-hacking-HOWTO which details the internals. iptables 1.6.1 IPTABLES-SAVE(8)
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