NAME

Rex::Commands::Iptables - Iptable Management Commands

DESCRIPTION

With this Module you can manage basic Iptables rules.

Version <= 1.0: All these functions will not be reported.

Only open_port and close_port are idempotent.

SYNOPSIS

            

              
              
use Rex::Commands::Iptables;
task "firewall", sub {
  iptables_clear;
  open_port 22;
  open_port [22, 80] => {
    dev => "eth0",
  };
  close_port 22 => {
    dev => "eth0",
  };
  close_port "all";
  redirect_port 80 => 10080;
  redirect_port 80 => {
    dev => "eth0",
    to  => 10080,
  };
  default_state_rule;
  default_state_rule dev => "eth0";
  is_nat_gateway;
  iptables t => "nat",
        A => "POSTROUTING",
        o => "eth0",
        j => "MASQUERADE";
  # The 'iptables' function also accepts long options,
  # however, options with dashes need to be quoted
  iptables table => "nat",
        accept          => "POSTROUTING",
        "out-interface" => "eth0",
        jump            => "MASQUERADE";
  # Version of IP can be specified in the first argument
  # of any function: -4 or -6 (defaults to -4)
  iptables_clear -6;
  open_port -6, [22, 80];
  close_port -6, "all";
  redirect_port -6, 80 => 10080;
  default_state_rule -6;
  iptables -6, "flush";
  iptables -6,
        t     => "filter",
        A     => "INPUT",
        i     => "eth0",
        m     => "state",
        state => "RELATED,ESTABLISHED",
        j     => "ACCEPT";
};
            
          

EXPORTED FUNCTIONS

open_port($port, $option)

Open a port for inbound connections.

            

              
              
task "firewall", sub {
  open_port 22;
  open_port [22, 80];
  open_port [22, 80],
    dev => "eth1";
};
task "firewall", sub {
 open_port 22,
   dev    => "eth1",
   only_if => "test -f /etc/firewall.managed";
} ;
            
          

close_port($port, $option)

Close a port for inbound connections.

            

              
              
task "firewall", sub {
  close_port 22;
  close_port [22, 80];
  close_port [22, 80],
    dev    => "eth0",
    only_if => "test -f /etc/firewall.managed";
};
            
          

redirect_port($in_port, $option)

Redirect $in_port to another local port.

            

              
              
task "redirects", sub {
  redirect_port 80 => 10080;
  redirect_port 80 => {
    to  => 10080,
    dev => "eth0",
  };
};
            
          

iptables(@params)

Write standard iptable comands.

Note that there is a short form for the iptables --flush option; when you pass the option of -F|"flush" as the only argument, the command iptables -F is run on the connected host. With the two argument form of flush shown in the examples below, the second argument is table you want to flush.

            

              
              
task "firewall", sub {
  iptables t => "nat", A => "POSTROUTING", o => "eth0", j => "MASQUERADE";
  iptables t => "filter", i => "eth0", m => "state", state => "RELATED,ESTABLISHED", j => "ACCEPT";
  # automatically flushes all tables; equivalent to 'iptables -F'
  iptables "flush";
  iptables -F;
  # flush only the "filter" table
  iptables flush => "filter";
  iptables -F => "filter";
};
# Note: options with dashes "-" need to be quoted to escape them from Perl
task "long_form_firewall", sub {
  iptables table => "nat",
       append          => "POSTROUTING",
       "out-interface" => "eth0",
       jump            => "MASQUERADE";
  iptables table => "filter",
       "in-interface" => "eth0",
       match          => "state",
       state          => "RELATED,ESTABLISHED",
       jump           => "ACCEPT";
};
            
          

is_nat_gateway

This function creates a NAT gateway for the device the default route points to.

            

              
              
task "make-gateway", sub {
  is_nat_gateway;
  is_nat_gateway -6;
};
            
          

default_state_rule(%option)

Set the default state rules for the given device.

            

              
              
task "firewall", sub {
  default_state_rule(dev => "eth0");
};
            
          

iptables_list

List all iptables rules.

            

              
              
task "list-iptables", sub {
  print Dumper iptables_list;
  print Dumper iptables_list -6;
};
            
          

iptables_clear

Remove all iptables rules.

            

              
              
task "no-firewall", sub {
  iptables_clear;
};
            
          

cpanm Rex

perl -MCPAN -e shell
install Rex