Bug in owner module

Bug in owner module

[ZenSecurity]

Hi, i have some issue with module (owner) in iptables v1.4.14 (debian
wheezy 7.2.0)

Current rule fails:

iptables -t nat -A OUTPUT -o eth0 -p tcp -s x.x.x.x -m owner --gid-owner
usergroup -j DNAT --to-destination x.x.x.x:80;

I tried to use numeric gid, it failed too..

But this rule works fine:

iptables -t nat -A OUTPUT -o eth0 -p tcp -s x.x.x.x -m owner --uid-owner
user -j DNAT --to-destination x.x.x.x:80;

Is it possible to fix this bug ?

Thanks!

Re: Bug in owner module

[Phil Oester]

On Sun, Dec 15, 2013 at 04:57:08PM +0300, ZenSecurity wrote:
> Hi, i have some issue with module (owner) in iptables v1.4.14 (debian
> wheezy 7.2.0)

what kernel version?

> Current rule fails:
> 
> iptables -t nat -A OUTPUT -o eth0 -p tcp -s x.x.x.x -m owner --gid-owner
> usergroup -j DNAT --to-destination x.x.x.x:80;
> 
> I tried to use numeric gid, it failed too..

Fails how??  Can't add the rule?  Doesn't match?  More details please.

Phil

Re: Bug in owner module

[Phil Oester]

On Sun, Dec 15, 2013 at 08:06:24PM +0300, ZenSecurity wrote:
> Kernel version: Linux lab 3.2.0-4-amd64 #1 SMP Debian 3.2.51-1 x86_64
> GNU/Linux
> 
> # iptables -t nat -L
> DNAT       tcp  --  domain.com   anywhere             owner GID match
> usergroup to: X.X.X.X:80
> 
> Rule:
> iptables -t nat -A OUTPUT -o eth0 -p tcp -s X.X.X.X -m owner --gid-owner
> usergroup -j DNAT --to-destination X.X.X.X:80;
> 
> Doesn't match (usergroup exist).

Works fine here, on kernel.org kernel.

[root@f20_main ~]# uname -r
3.13.0-rc1+
[root@f20_main ~]# iptables -t nat -A OUTPUT -m owner --gid-owner 1000
[root@f20_main ~]# su - phil
[phil@f20_main ~]$ id
uid=1000(phil) gid=1000(phil) groups=1000(phil)
[phil@f20_main ~]$ ping -c1 10.10.10.1
PING 10.10.10.1 (10.10.10.1) 56(84) bytes of data.
64 bytes from 10.10.10.1: icmp_seq=1 ttl=64 time=1.02 ms

--- 10.10.10.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 1.022/1.022/1.022/0.000 ms
[phil@f20_main ~]$ logout
[root@f20_main ~]# iptables -t nat -nvL OUTPUT
Chain OUTPUT (policy ACCEPT 1 packets, 84 bytes)
 pkts bytes target     prot opt in     out     source               destination         
    1    84            all  --  *      *       0.0.0.0/0            0.0.0.0/0            owner GID match 1000

I suggest filing a bug with Debian bugzilla if you suspect a problem in a Debian
kernel.  

Phil