Server Provisioning

ifupdown

  cat /proc/cpuinfo |grep processor
  processor       : 0
  processor       : 1
  processor       : 2
  processor       : 3

apt-get install ntp ntpdate python vim screen ipsec-tools strongswan fail2ban snmp haveged libacl1-dev python3-dev libssl-dev gcc g++ fio pbzip2 ncdu

sudo systemctl disable systemd-resolved.service
sudo systemctl stop systemd-resolved
rm /etc/resolv.conf 
sudo touch /etc/cloud/cloud-init.disabled
sudo apt-get purge cloud-init

echo "nameserver 1.1.1.1" > /etc/resolv.conf
apt-get install ifupdown

systemctl unmask networking
systemctl enable networking
systemctl restart networking

systemctl stop systemd-networkd.socket systemd-networkd networkd-dispatcher systemd-networkd-wait-online
systemctl disable systemd-networkd.socket systemd-networkd networkd-dispatcher systemd-networkd-wait-online
systemctl mask systemd-networkd.socket systemd-networkd networkd-dispatcher systemd-networkd-wait-online
apt-get --assume-yes purge nplan netplan.io

# The primary network interface
auto eth0
iface eth0 inet6 static
   address 9805:0900:0340:1000::2600/64
   autoconf 0
   accept_ra 2	
iface eth0 inet static
    address 44.103.0.49
    netmask 255.255.255.0
    network 44.103.0.0
    broadcast 44.103.0.255
    gateway 44.103.0.1 
    dns-nameservers 44.103.0.4 1.1.1.1
    dns-search allstarlink.org
    up /etc/network/firewall.sh

  network:
    version: 2
    rendered: networkd
    ethernets:
      eth0:
        addresses:
          - 44.98.254.1/24
        gateway4: 44.98.254.1
        nameservers:
          search: [allstarlink.org]
          addresses: [1.1.1.1]

  netplan try

   root@server# ifconfig |grep HWaddr
   eth0      Link encap:Ethernet  HWaddr 52:54:00:73:86:06  

   echo 'SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="52:54:00:73:86:06", ATTR{dev_id}=="0x0", ATTR{type}=="1", NAME="eth0"' >/etc/udev/rules.d/70-persistent-net.rules

  vim /etc/default/grub

  GRUB_CMDLINE_LINUX="net.ifnames=0 biosdevname=0"

  sudo grub-mkconfig -o /boot/grub/grub.cfg

  vim /etc/screenrc
  uncomment "termcapinfo xterm|xterms|xs|rxvt ti@:te@"

   vim /etc/bash.bashrc
   uncomment the stuff below 
   # enable bash completion in interactive shells 

   echo "domain.allstarlink.org" >/etc/hostname

   update-alternatives --config editor 
   Then select #3 vim.basic

   #!/bin/bash

   INET_IF=eth0

   #Flush and zero all tables
   modprobe ip_tables
   modprobe ipt_limit
   modprobe iptable_mangle
   modprobe ipt_state
   modprobe ipt_LOG
   modprobe iptable_filter

   iptables -F INPUT
   iptables -F FORWARD
   iptables -t nat -F POSTROUTING
   iptables -t nat -F PREROUTING

   #init the log-and-drop chain
   iptables -F log-and-drop
   iptables -X log-and-drop
   iptables -N log-and-drop
   #init log-and-reject
   iptables -F log-and-reject
   iptables -X log-and-reject
   iptables -N log-and-reject

   echo "all tables flushed and dropped"
   # Specific chain used for logging packets before blocking them
   iptables -A log-and-drop -j LOG --log-prefix "[IPTables] Drop "
   iptables -A log-and-drop -j DROP

   # Specific chain used for logging packets before blocking them
   iptables -A log-and-reject -j LOG --log-prefix "[IPTables] Reject "
   iptables -A log-and-reject -j REJECT
   echo "logging chains setup"

   # The packets having the TCP flags activated are dropped
   # and so for the ones with no flag at all (often used with Nmap scans)
   iptables -A FORWARD -p tcp --tcp-flags ALL ALL -j log-and-drop
   iptables -A FORWARD -p tcp --tcp-flags ALL NONE -j log-and-drop

   #Global blocks
   #iptables -t filter -A INPUT -j DROP -s 119.118.232.185/24

   # allow IPSEC from other boxes
   IPSECsrc='199.47.174.150,44.98.254.151,44.103.0.48,44.103.0.49,44.98.254.145,44.72.21.13,44.72.21.12'
   #Technically the next two are not needed as we have the policy
   iptables -A INPUT -i $INET_IF -p 50 -j ACCEPT --src "$IPSECsrc"
   iptables -A INPUT -i $INET_IF -p 51 -j ACCEPT --src "$IPSECsrc"
   iptables -A INPUT -i $INET_IF -p udp --dport 500 -j ACCEPT --src "$IPSECsrc"
   # this is needed to allow all ipsec packets when it's host to host
   iptables -A INPUT -m policy --dir in --pol ipsec -j ACCEPT --src "$IPSECsrc" 

   # allow all ssh in
   iptables -t filter -A INPUT -j ACCEPT --protocol tcp --dport 22

   #allow http and https
   #iptables -t filter -A INPUT -j ACCEPT --protocol tcp --dport 80
   #iptables -t filter -A INPUT -j ACCEPT --protocol tcp --dport 443
   # allow asterisk 4569
   #iptables -t filter -A INPUT -j ACCEPT --protocol udp --dport 4569
   # allow DNS
   #iptables -t filter -A INPUT -j ACCEPT --protocol tcp --dport 53
   #iptables -t filter -A INPUT -j ACCEPT --protocol udp --dport 53

   echo "end of services"
   # allow ping at 2 per sec
    iptables -t filter -A INPUT -j ACCEPT --in-interface $INET_IF --protocol icmp --icmp-type echo-request --match limit --limit 4/s --limit-burst 3
    iptables -t filter -A INPUT -j log-and-drop  --in-interface $INET_IF --protocol icmp --icmp-type echo-request
   # allow responces to local initated connections
   #iptables -A INPUT -i  $INET_IF --match state --state NEW,INVALID -j log-and-drop
   #iptables -A FORWARD -i $INET_IF  --match state --state NEW,INVALID -j log-and-drop
   iptables -t filter -A INPUT -j ACCEPT --match state --state RELATED,ESTABLISHED
   # Set rp_filter to 2
   for i in `find /proc/sys/net/ipv*/conf -name rp_filter`
   do
           echo "2" >$i
   done
   # setup a default deny rule for outside traffic
   iptables -t filter -A INPUT --in-interface $INET_IF -j log-and-drop

   vi /etc/fail2ban/jail.conf
   ignoreip = 127.0.0.1/8 199.47.172.0/22 44.98.254.0/24 44.72.21.0/24 44.103.0.0/24
   bantime  = 3600
   # A host is banned if it has generated "maxretry" during the last "findtime"
   # seconds.
   findtime  = 3600
   # "maxretry" is the number of failures before a host get banned.
   maxretry = 2
   banaction = route

   sudo timedatectl set-timezone UTC

   example:
   stats             IN      PTR     stats.allstarlink.org.

   /etc/ipsec.conf
   conn one-to-two
           authby=secret
           #auto=start enabled the tunnel to come up even if there is not traffic for it.  
           auto=start
           keyexchange=ike
           left=4.1.1.1
           right=4.2.2.2
           leftikeport=500
           rightikeport=500   
           type=transport
           esp=aes128gcm16!
           dpddelay=5
           dpdtimeout=20
           dpdaction=restart

   vim /etc/ipsec.secrets
   44.1.1.1 44.2.2.2 : PSK "This is the AllStarLink PSK"

   conn two-to-one
           authby=secret
           #auto=start enabled the tunnel to come up even if there is not traffic for it.  
           auto=start
           keyexchange=ike
           left=4.2.2.2
           right=4.1.1.1
           leftikeport=500
           rightikeport=500   
           type=transport
           esp=aes128gcm16!
           dpddelay=5
           dpdtimeout=20
           dpdaction=restart

   vim /etc/ipsec.secrets
   44.2.2.2 44.1.1.1 : PSK "This is the AllStarLink PSK"

   root@server# ipsec status
   two-to-one[839]: ESTABLISHED 98 minutes ago, 44.1.1.1[44.1.1.1]...44.2.2.2[44.2.2.2]
   two-to-one{13209}:  INSTALLED, TRANSPORT, reqid 695, ESP SPIs: c824e4db_i c1e4bf5c_o
   two-to-one{13209}:   44.1.1.1/32 === 44.2.2.2/32

Server Provisioning

Contents

Server Overview

Basic Requirements

Install guide

Mandatory Software

Configuration

No Netplan Config

Netplan config

Persistent Interface Names

UDEV method

Grub method

Other config items

Configure IPSEC

Server 1

Server 2

Verify IPsec

Configure Postfix

Verification

Items to check

Network Monitoring

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