Inilah yang saya lakukan dengan Red Hat Enterprise (RHEL).
RHEL memiliki iptables
layanan yang memuat aturan dari /etc/sysconfig/iptables
dan saya sedang bekerja dengan memodifikasi file itu dan memulai kembali layanan iptables. Banyak orang suka meletakkan fragmen ke direktori iptables.d dan membangun iptables (melalui make atau sesuatu seperti itu) dari aturan itu. Saya menyertakan hal-hal untuk membangun kembali aturan default, tetapi itu biasanya tidak pernah melakukan apa-apa. Jika kebutuhan Anda sederhana, Anda bisa menyalin file iptables ke sistem.
Meskipun tampak jelek, ini cukup teruji pada RHEL4, RHEL5 dan RHEL6.
Aku melakukan ini sebelum dukungan augeas ada di boneka. Jika saya menulisnya lagi hari ini saya akan melihat lensa iptables augeas sebelum beralih exec { "perl ...": }
.
Beberapa definisi global untuk mengedit file pada tempatnya
# Ensure that the line "line" exists in "file":
# Usage:
# append_if_no_such_line { dummy_modules:
# file => "/etc/modules",
# line => dummy
# }
#
define append_if_no_such_line($file, $line, $refreshonly = 'false') {
exec { "/bin/echo '$line' >> '$file'":
unless => "/bin/grep -Fxqe '$line' '$file'",
refreshonly => $refreshonly,
}
}
# Ensure that the line "line" exists in "file":
# Usage:
# prepend_if_no_such_line { dummy_modules:
# file => "/etc/modules",
# line => dummy
# }
#
define prepend_if_no_such_line($file, $line, $refreshonly = 'false') {
$line_no_slashes = slash_escape($line)
exec { "/usr/bin/perl -p0i -e 's/^/$line_no_slashes\n/;' '$file'":
unless => "/bin/grep -Fxqe '$line' '$file'",
refreshonly => $refreshonly,
}
}
define insert_line_after_if_no_such_line($file, $line, $after) {
$line_no_slashes = slash_escape($line)
$after_no_slashes = slash_escape($after)
exec { "/usr/bin/perl -p0i -e 's/^($after_no_slashes)\$/\$1\n$line_no_slashes/m' '$file'":
onlyif => "/usr/bin/perl -ne 'BEGIN { \$ret = 0; } \$ret = 1 if /^$line_no_slashes/; END { exit \$ret; }' '$file'",
}
}
define insert_line_before_if_no_such_line($file, $line, $beforeline) {
$line_no_slashes = slash_escape($line)
$before_no_slashes = slash_escape($beforeline)
exec { "/usr/bin/perl -p0i -e 's/^($before_no_slashes)\$/$line_no_slashes\n\$1/m' '$file'":
onlyif => "/usr/bin/perl -ne 'BEGIN { \$ret = 0; } \$ret = 1 if /^$line_no_slashes/; END { exit \$ret; }' '$file'",
}
}
Kelas iptables saya:
class iptables {
if $lsbmajdistrelease >= '6' {
$primarychain = 'INPUT'
} else {
$primarychain = 'RH-Firewall-1-INPUT'
}
package {
iptables:
ensure => installed # "latest" would be too much
}
service {
iptables:
enable => true, # default on
ensure => running, # start it up if it's stopped
hasstatus => true, # since there's no daemon
}
file {
"/etc/sysconfig/iptables":
ensure => present;
}
##
# Build up a config if it's missing components we expect; should
# automatically repair a config if it's broken for really simple reasons
##
# Very first thing: a comment at the top warning about our evil; add even if
# we're not touching anything else...
prepend_if_no_such_line {
"/etc/sysconfig/iptables comment":
file => "/etc/sysconfig/iptables",
line => "# This file partially managed by puppet; attempts to edit will result in magic reappearances"
}
# start
# *filter
insert_line_after_if_no_such_line {
"/etc/sysconfig/iptables *filter":
file => "/etc/sysconfig/iptables",
line => "\\*filter",
after => "#.*",
notify => Service[iptables],
}
# first default chain
# :INPUT ACCEPT [0:0]
insert_line_after_if_no_such_line {
"/etc/sysconfig/iptables:INPUT":
file => "/etc/sysconfig/iptables",
line => ":INPUT ACCEPT \\[0:0\\]",
after => "\\*filter",
notify => Service[iptables],
}
# second default chain
# :FORWARD ACCEPT [0:0]
insert_line_after_if_no_such_line {
"/etc/sysconfig/iptables:FORWARD":
file => "/etc/sysconfig/iptables",
line => ":FORWARD ACCEPT \\[0:0\\]",
after => ":INPUT ACCEPT \\[\\d+:\\d+\\]",
notify => Service[iptables],
}
# third default chain
# :OUTPUT ACCEPT [0:0]
insert_line_after_if_no_such_line {
"/etc/sysconfig/iptables:OUTPUT":
file => "/etc/sysconfig/iptables",
line => ":OUTPUT ACCEPT \\[0:0\\]",
after => ":FORWARD ACCEPT \\[\\d+:\\d+\\]",
notify => Service[iptables],
}
if $lsbmajdistrelease <= 5 {
# Finally, the RH special chain
# :RH-Firewall-1-INPUT - [0:0]
insert_line_after_if_no_such_line {
"/etc/sysconfig/iptables:RH-Firewall-1-INPUT":
file => "/etc/sysconfig/iptables",
line => ":RH-Firewall-1-INPUT - \\[0:0\\]",
after => ":OUTPUT ACCEPT \\[\\d+:\\d+\\]",
notify => Service[iptables],
}
# redirect INPUT to RH chain
# -A INPUT -j RH-Firewall-1-INPUT
insert_line_after_if_no_such_line {
"/etc/sysconfig/iptables:INPUT:RH-Firewall-1-INPUT":
file => "/etc/sysconfig/iptables",
line => "-A INPUT -j RH-Firewall-1-INPUT",
after => ":RH-Firewall-1-INPUT - \\[\\d+:\\d+\\]",
notify => Service[iptables],
}
# redirect FORWARD to RH chain
# -A FORWARD -j RH-Firewall-1-INPUT
insert_line_after_if_no_such_line {
"/etc/sysconfig/iptables:FORWARD:RH-Firewall-1-INPUT":
file => "/etc/sysconfig/iptables",
line => "-A FORWARD -j RH-Firewall-1-INPUT",
after => "-A INPUT -j RH-Firewall-1-INPUT",
notify => Service[iptables],
}
}
# Let anything on localhost work...
# -A $primarychain -i lo -j ACCEPT
insert_line_after_if_no_such_line {
"/etc/sysconfig/iptables:$primarychain lo":
file => "/etc/sysconfig/iptables",
line => "-A $primarychain -i lo -j ACCEPT",
after => "-A FORWARD -j $primarychain",
notify => Service[iptables],
}
# And let through all the ICMP stuff:
# -A $primarychain -p icmp --icmp-type any -j ACCEPT
if $lsbmajdistrelease >= '6' {
insert_line_after_if_no_such_line {
"/etc/sysconfig/iptables:$primarychain icmp":
file => "/etc/sysconfig/iptables",
line => "-A $primarychain -p icmp -j ACCEPT",
after => "-A $primarychain -i lo -j ACCEPT",
notify => Service[iptables],
}
} else {
insert_line_after_if_no_such_line {
"/etc/sysconfig/iptables:$primarychain icmp":
file => "/etc/sysconfig/iptables",
line => "-A $primarychain -p icmp --icmp-type any -j ACCEPT",
after => "-A $primarychain -i lo -j ACCEPT",
notify => Service[iptables],
}
}
# Finally, let anything that's part of an exisiting connection through:
# -A $primarychain -m state --state ESTABLISHED,RELATED -j ACCEPT
insert_line_after_if_no_such_line {
"/etc/sysconfig/iptables:ESTABLISHED":
file => "/etc/sysconfig/iptables",
line => "-A $primarychain -m state --state ESTABLISHED,RELATED -j ACCEPT",
after => "-A $primarychain -p icmp --icmp-type any -j ACCEPT",
notify => Service[iptables],
}
# Very last thing:
# COMMIT
append_if_no_such_line {
"/etc/sysconfig/iptables:COMMIT":
file => "/etc/sysconfig/iptables",
line => "COMMIT",
notify => Service[iptables],
}
# Next to last thing: reject!
# -A $primarychain -j REJECT --reject-with icmp-host-prohibited
insert_line_before_if_no_such_line {
"/etc/sysconfig/iptables:final reject":
file => "/etc/sysconfig/iptables",
line => "-A $primarychain -j REJECT --reject-with icmp-host-prohibited",
beforeline => "COMMIT",
notify => Service[iptables],
}
}
# example:
# iptable_rule { "iptable:ssh":
# rule => "-m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT"
# }
# change your mind about a rule, do this:
# iptable_rule { "iptable:ssh":
# rule => "-m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT",
# ensure => "absent",
# }
define iptable_rule($rule, $ensure = 'present') {
if $lsbmajdistrelease >= '6' {
$primarychain = 'INPUT'
} else {
$primarychain = 'RH-Firewall-1-INPUT'
}
$iptablesline = "-A $primarychain $rule"
case $ensure {
default: { err ( "unknown ensure value $ensure" ) }
present: {
insert_line_before_if_no_such_line {
"/etc/sysconfig/iptables:add $rule":
file => "/etc/sysconfig/iptables",
line => $iptablesline,
beforeline => "-A $primarychain -j REJECT --reject-with icmp-host-prohibited",
notify => Service[iptables],
}
}
absent: {
delete_lines {
"/etc/sysconfig/iptables:remove $rule":
file => "/etc/sysconfig/iptables",
pattern => $iptablesline,
notify => Service[iptables],
}
}
}
}
# Example:
# iptable_tcp_port { "iptable:ssh":
# port => "22",
# }
# Example:
# iptable_tcp_port { "iptable:oracle:130.157.5.0/24":
# port => "1521",
# source => "130.157.5.0/24",
# }
# (add ensure => "absent" to remove)
define iptable_tcp_port($port, $ensure = 'present', $source = 'ANY') {
case $source {
"ANY": {
iptable_rule {
"iptable_tcp_port:$port":
rule => "-m state --state NEW -m tcp -p tcp --dport $port -j ACCEPT",
ensure => $ensure,
}
}
default: {
iptable_rule {
"iptable_tcp_port:$port:$source":
rule => "-m state --state NEW -m tcp -p tcp --source $source --dport $port -j ACCEPT",
ensure => $ensure,
}
}
}
}
# Example:
# iptable_udp_port { "iptable:ntp":
# port => "123",
# }
# (again, ensure => "absent" if needed)
define iptable_udp_port($port, $ensure = 'present', $source = 'ANY') {
case $source {
"ANY": {
iptable_rule {
"iptable_udp_port:$port":
rule => "-p udp -m udp --dport $port -j ACCEPT",
ensure => $ensure,
}
}
default: {
iptable_rule {
"iptable_udp_port:$port":
rule => "-p udp -m udp --source $source --dport $port -j ACCEPT",
ensure => $ensure,
}
}
}
}
Beberapa contoh penggunaan di kelas lain:
class ssh {
include iptables
iptable_tcp_port {
"iptables:ssh":
port => "22",
ensure => "present"
}
}
class ssh_restricted inherits ssh {
Iptable_tcp_port["iptables:ssh"]{ensure => "absent"}
iptable_tcp_port {
"ssh:RESTRICTED":
port => "22",
source => "X.Y.0.0/16",
ensure => "present";
}
}
class apache {
iptable_tcp_port {
"iptables:http":
require => Service["httpd"],
port => "80";
}
}
class apache::secure {
iptable_tcp_port {
"iptables:https":
require => Service["httpd"],
port => "443";
}
}
class snmp {
iptable_udp_port { "iptables:snmp": port => "161" }
}