Premier commit

roles/r-ext/files/ferm.conf

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+# -*- shell-script -*-
+#
+#  Configuration file for ferm(1).
+#
+
+@def $DEV_ADM     = enp0s3;
+@def $DEV_DMZ     = enp0s8;
+@def $DEV_WORLD   = enp0s9;
+@def $DEV_VPN     = enp0s10;
+@def $DEV_LINK    = enp0s16;
+
+@def $NET_ADM     = 192.168.99.0/24;
+@def $NET_DMZ     = 192.168.100.0/24;
+@def $NET_WORLD   = 192.168.0.0/24;
+@def $NET_LINKV   = 192.168.1.0/30;
+@def $NET_LINK    = 192.168.200.0/24;
+
+# mon ip static
+#@def $HOST_STATIC = 
+@include '/root/tools/ansible/gsb2022/roles/r-ext/files/mkferm |';
+#@def $HOST_PASSERELLEDMZ = 172.16.0.1;
+
+@def &FORWARD_TCP($proto, $port, $dest) = {
+        table filter chain FORWARD interface $DEV_WORLD outerface $DEV_DMZ daddr $dest proto $proto dport $port ACCEPT;
+        table nat chain PREROUTING interface $DEV_WORLD daddr $HOST_STATIC proto $proto dport $port DNAT to $dest;
+}
+#@def &FORWARD($proto, $port, $dest) = {
+#	table filter chain FORWARD interface $DEV_DMZ outerface $DEV_PRIVATE daddr $dest proto $proto dport $port ACCEPT;
+#	table nat chain PREROUTING interface $DEV_DMZ daddr $HOST_PASSERELLEDMZ proto $proto dport $port DNAT to $dest;
+#}
+
+#&FORWARD(tcp, 3306, 10.0.0.2);
+#&FORWARD_TCP(tcp, http, 192.168.100.254);
+#&FORWARD_TCP(tcp, smtp, 192.168.1.3);
+
+table filter {
+    chain INPUT {
+        policy DROP;
+
+        # connection tracking
+        mod state state INVALID DROP;
+        mod state state (ESTABLISHED RELATED) ACCEPT;
+
+        # allow local packet
+        interface lo ACCEPT;
+
+        # respond to ping
+        proto icmp ACCEPT; 
+
+        # allow IPsec
+	interface ($DEV_LINK) {
+        proto udp dport 500 ACCEPT;
+        proto (esp ah) ACCEPT;
+	}
+        # allow SSH connections
+	interface ($DEV_ADM) {
+        proto tcp dport ssh ACCEPT;
+	}
+        # we provide DNS for the internal net
+        interface ($DEV_WORLD $DEV_DMZ) {
+	        proto (udp tcp) dport domain ACCEPT;
+		proto (tcp) dport http ACCEPT;
+        }
+
+    }
+    chain OUTPUT {
+        policy ACCEPT;
+
+        # connection tracking
+        #mod state state INVALID DROP;
+        mod state state (ESTABLISHED RELATED) ACCEPT;
+    }
+    chain FORWARD {
+        policy DROP;
+
+        # connection tracking
+        mod state state INVALID DROP;
+        mod state state (ESTABLISHED RELATED) ACCEPT;
+
+        # the DMZ may only access the internet
+        interface ($DEV_DMZ $DEV_LINK) {
+            outerface $DEV_WORLD ACCEPT;
+            # report failure gracefully
+            REJECT reject-with icmp-net-prohibited;
+        }
+
+        interface ($DEV_WORLD) {
+            proto tcp dport http outerface $DEV_DMZ ACCEPT;
+            # report failure gracefully
+            REJECT reject-with icmp-net-prohibited;
+        }
+    }
+}
+
+table nat {
+    chain POSTROUTING {
+        # masquerade private IP addresses
+        saddr ($NET_LINK) outerface $DEV_WORLD SNAT to $HOST_STATIC;
+    }
+}
+
+
+
+# IPv6:
+#domain ip6 {
+#    table filter {
+#        chain INPUT {
+#            policy ACCEPT;
+#            # ...
+#        }
+#        # ...
+#    }
+#}

roles/r-ext/files/ipFerm.sh

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+#!/bin/bash
+
+ip a show dev enp0s9|grep "inet "|cut -d/ -f1 | cut -dt -f2

roles/r-ext/files/mkferm

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+#!/bin/bash
+#IPADD=$(root/ipFerm.sh| tr -d '\n')
+#MSG="@def $HOST_STATIC = $
+echo -n -E "@def \$HOST_STATIC ="
+/root/tools/ansible/gsb2022/roles/r-ext/files/ipFerm.sh |tr -d '\n' 
+echo  ";" 
+

roles/r-ext/files/nat.sh

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+#!/bin/bash
+echo "1" > /proc/sys/net/ipv4/ip_forward
+iptables -t nat -A POSTROUTING -o enp0s3 -j MASQUERADE
+iptables -t nat -A POSTROUTING -o enp0s9 -j MASQUERADE

roles/r-ext/files/routagenat

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+#!/usr/bin/perl
+
+qx(route add -net 0.0.0.0 netmask 0.0.0.0 gw 192.168.200.253);

roles/r-ext/files/sysctl.conf

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+#
+# /etc/sysctl.conf - Configuration file for setting system variables
+# See /etc/sysctl.d/ for additonal system variables
+# See sysctl.conf (5) for information.
+#
+
+#kernel.domainname = example.com
+
+# Uncomment the following to stop low-level messages on console
+#kernel.printk = 3 4 1 3
+
+##############################################################3
+# Functions previously found in netbase
+#
+
+# Uncomment the next two lines to enable Spoof protection (reverse-path filter)
+# Turn on Source Address Verification in all interfaces to
+# prevent some spoofing attacks
+#net.ipv4.conf.default.rp_filter=1
+#net.ipv4.conf.all.rp_filter=1
+
+# Uncomment the next line to enable TCP/IP SYN cookies
+# See http://lwn.net/Articles/277146/
+# Note: This may impact IPv6 TCP sessions too
+#net.ipv4.tcp_syncookies=1
+
+# Uncomment the next line to enable packet forwarding for IPv4
+net.ipv4.ip_forward=1
+
+# Uncomment the next line to enable packet forwarding for IPv6
+#  Enabling this option disables Stateless Address Autoconfiguration
+#  based on Router Advertisements for this host
+#net.ipv6.conf.all.forwarding=1
+
+
+###################################################################
+# Additional settings - these settings can improve the network
+# security of the host and prevent against some network attacks
+# including spoofing attacks and man in the middle attacks through
+# redirection. Some network environments, however, require that these
+# settings are disabled so review and enable them as needed.
+#
+# Do not accept ICMP redirects (prevent MITM attacks)
+#net.ipv4.conf.all.accept_redirects = 0
+#net.ipv6.conf.all.accept_redirects = 0
+# _or_
+# Accept ICMP redirects only for gateways listed in our default
+# gateway list (enabled by default)
+# net.ipv4.conf.all.secure_redirects = 1
+#
+# Do not send ICMP redirects (we are not a router)
+#net.ipv4.conf.all.send_redirects = 0
+#
+# Do not accept IP source route packets (we are not a router)
+#net.ipv4.conf.all.accept_source_route = 0
+#net.ipv6.conf.all.accept_source_route = 0
+#
+# Log Martian Packets
+#net.ipv4.conf.all.log_martians = 1
+#

roles/r-ext/tasks/main.yml

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+---
+
+- name: Copie du fichier sysctl.conf
+  copy: 
+    src: sysctl.conf
+    dest: /etc/
+
+- name: copier le script de routage
+  copy: 
+    src: nat.sh
+    dest: /root/
+    mode: '0755'
+
+- name: installer ferm
+  apt: 
+    name: ferm
+    state: present
+    update_cache: yes
+
+- name: copier le fichier ferm.conf
+  copy: 
+    src: ferm.conf
+    dest: /etc/ferm/
+