OpenVPN: IPv4 /32 single client: Difference between revisions

From OnnoCenterWiki
Jump to navigationJump to search
← Older edit
Onnowpurbo (talk | contribs)
69,477 edits
Onnowpurbo (talk | contribs)
69,477 edits
Onnowpurbo (talk | contribs)
69,477 edits
 
(16 intermediate revisions by the same user not shown)
Line 5: Line 5:




  CLIENT 1 ------- HOST A ---------------- HOST B --------- CLIENT 2
  CLIENT 1 ------- HOST A ---------------- HOST B
                   ovpn server            ovpn client
                   ovpn server            ovpn client


Host A akan berfungsi sebagai OpenVPN Server.
Host A akan berfungsi sebagai OpenVPN Server.
Line 27: Line 24:
Download script openvpn-install dari github
Download script openvpn-install dari github


sudo su
apt install openssh-server openvpn
  cd /usr/local/src
  cd /usr/local/src
  wget https://git.io/vpn -O openvpn-install.sh
  wget https://git.io/vpn -O openvpn-install.sh
Line 41: Line 41:
  Press any key to continue...  <ENTER>
  Press any key to continue...  <ENTER>


Maka akan tampak file client.ovpn, di


/root/client.ovpn


Install openssh-server di client, copykan client.ovpn ke client


scp client.ovpn root@192.168.0.237:


Welcome to this quick OpenVPN "road warrior" installer
I need to ask you a few questions before starting the setup
You can leave the default options and just press enter if you are ok with them
First I need to know the IPv4 address of the network interface you want OpenVPN
listening to.
IP address: 192.168.43.150
Select which protocol do you want to use. I want to use tcp port, hence I selected number 2.
Which protocol do you want for OpenVPN connections?
1) UDP (recommended)
2) TCP
Protocol [1-2]: 2
Enter the port number.
What port do you want OpenVPN listening to?
Port: 1194


Enter the DNS server details do you want to use with the VPN. I want to use Google DNS resolvers, so I selected the option 2.
Reboot


Which DNS do you want to use with the VPN?
  shutdown -r now
  1) Current system resolvers
2) Google
3) OpenDNS
4) NTT
5) Hurricane Electric
6) Verisign
DNS [1-6]: 2


We have reached the final step. Enter your client certificate name. The name should be single word, and shouldn’t contain any special characters.
Cek kondisi jaringan


Finally, tell me your name for the client certificate
ifconfig
Please, use one word only, no special characters
Client name: client


Press ENTER key to start the OPENVPN server installation.
Akan muncul interface tun0


Okay, that was all I needed. We are ready to setup your OpenVPN server now
tun0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST>  mtu 1500
Press any key to continue...
        inet 10.8.0.1  netmask 255.255.255.0  destination 10.8.0.1
        inet6 fe80::eaaa:77ed:ba02:748  prefixlen 64  scopeid 0x20<link>
        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 100  (UNSPEC)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 6  bytes 288 (288.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0


Npw, this script will start to install all necessary packages to setup OpenVPN server. Anslo, it will create all necessary keys and certificates to authenticate with the VPN clients. This will take a few minutes.
==Konfigurasi OpenVPN Client==


Finally, the script will ask you if you have any External IP address. If you don’t have any, just ignore by leaving it blank and press ENTER key.
Pastikan openvpn terinstalsi


If your server is NATed (e.g. LowEndSpirit), I need to know the external IP
sudo su
If that's not the case, just ignore this and leave the next field blank
apt install openssh-server openvpn
External IP:


Finished!
Edit /etc/hosts isi dengan nama OpenVPN server


Your client configuration is available at /root/client.ovpn
192.168.0.239 vpnserver
If you want to add more clients, you simply need to run this script again!


OpenVPN server installation and configuration is completed. As you see in the last output, the client configuration details is stored in a file /root/client.ovpn. You need to copy this file to all your VPN client systems.


I copied the client.ovpn file to my VPN client
Jalankan OpenVPN client


  scp client.ovpn root@192.168.43.199:/etc/openvpn/
  cd ~
sudo su
openvpn --config client.ovpn


Next, we need to configure the OpenVPN client.
Akan keluar kira-kira
Download – Free Video: “Penetration Testing Methodologies Training Course (a $99 value!) FREE”


==OpenVPN client Configuration==
..
..
Sat Feb 16 08:24:45 2019 TUN/TAP device tun0 opened
Sat Feb 16 08:24:45 2019 TUN/TAP TX queue length set to 100
Sat Feb 16 08:24:45 2019 do_ifconfig, tt->did_ifconfig_ipv6_setup=0
Sat Feb 16 08:24:45 2019 /sbin/ip link set dev tun0 up mtu 1500
Sat Feb 16 08:24:45 2019 /sbin/ip addr add dev tun0 10.8.0.2/24 broadcast 10.8.0.255
Sat Feb 16 08:24:45 2019 /sbin/ip route add 192.168.0.239/32 dev enp0s3
Sat Feb 16 08:24:45 2019 /sbin/ip route add 0.0.0.0/1 via 10.8.0.1
Sat Feb 16 08:24:45 2019 /sbin/ip route add 128.0.0.0/1 via 10.8.0.1
Sat Feb 16 08:24:45 2019 WARNING: this configuration may cache passwords in memory -- use the auth-nocache option to prevent this
Sat Feb 16 08:24:45 2019 Initialization Sequence Completed


Make sure you have copied the client.ovpn file from your VPN server system. I already have copied this file to /etc/openvpn/ directory of my VPN client system.
Cek interface, akan muncul tun0


Install OpenVPN package using the distribution package manager.
ifconfig


  yum install openvpn
  tun0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST>  mtu 1500
        inet 10.8.0.2  netmask 255.255.255.0  destination 10.8.0.2
        inet6 fe80::28c4:3e38:2497:e12a  prefixlen 64  scopeid 0x20<link>
        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 100  (UNSPEC)
        RX packets 51  bytes 11522 (11.5 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 134  bytes 43524 (43.5 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0


Next, run the following command to establish secure connection with VPN server.
Cek sambungan
 
openvpn --config /etc/openvpn/client.ovpn
 
Sample output:
 
Wed Apr 5 18:50:44 2017 Unrecognized option or missing parameter(s) in /etc/openvpn/client.ovpn:14: block-outside-dns (2.3.14)
Wed Apr 5 18:50:44 2017 OpenVPN 2.3.14 x86_64-redhat-linux-gnu [SSL (OpenSSL)] [LZO] [EPOLL] [PKCS11] [MH] [IPv6] built on Dec 7 2016
Wed Apr 5 18:50:44 2017 library versions: OpenSSL 1.0.1e-fips 11 Feb 2013, LZO 2.06
Wed Apr 5 18:50:44 2017 Control Channel Authentication: tls-auth using INLINE static key file
Wed Apr 5 18:50:44 2017 Outgoing Control Channel Authentication: Using 160 bit message hash 'SHA1' for HMAC authentication
Wed Apr 5 18:50:44 2017 Incoming Control Channel Authentication: Using 160 bit message hash 'SHA1' for HMAC authentication
Wed Apr 5 18:50:44 2017 Socket Buffers: R=[87380->87380] S=[16384->16384]
Wed Apr 5 18:50:44 2017 Attempting to establish TCP connection with [AF_INET]192.168.43.150:1194 [nonblock]
Wed Apr 5 18:50:45 2017 TCP connection established with [AF_INET]192.168.43.150:1194
Wed Apr 5 18:50:45 2017 TCPv4_CLIENT link local: [undef]
Wed Apr 5 18:50:45 2017 TCPv4_CLIENT link remote: [AF_INET]192.168.43.150:1194
Wed Apr 5 18:50:45 2017 TLS: Initial packet from [AF_INET]192.168.43.150:1194, sid=c6fb554e 362eb192
Wed Apr 5 18:50:45 2017 VERIFY OK: depth=1, CN=ChangeMe
Wed Apr 5 18:50:45 2017 Validating certificate key usage
Wed Apr 5 18:50:45 2017 ++ Certificate has key usage 00a0, expects 00a0
Wed Apr 5 18:50:45 2017 VERIFY KU OK
Wed Apr 5 18:50:45 2017 Validating certificate extended key usage
Wed Apr 5 18:50:45 2017 ++ Certificate has EKU (str) TLS Web Server Authentication, expects TLS Web Server Authentication
Wed Apr 5 18:50:45 2017 VERIFY EKU OK
Wed Apr 5 18:50:45 2017 VERIFY OK: depth=0, CN=server
Wed Apr 5 18:50:45 2017 Data Channel Encrypt: Cipher 'AES-256-CBC' initialized with 256 bit key
Wed Apr 5 18:50:45 2017 Data Channel Encrypt: Using 160 bit message hash 'SHA1' for HMAC authentication
Wed Apr 5 18:50:45 2017 Data Channel Decrypt: Cipher 'AES-256-CBC' initialized with 256 bit key
Wed Apr 5 18:50:45 2017 Data Channel Decrypt: Using 160 bit message hash 'SHA1' for HMAC authentication
Wed Apr 5 18:50:45 2017 Control Channel: TLSv1.2, cipher TLSv1/SSLv3 DHE-RSA-AES256-GCM-SHA384, 2048 bit RSA
Wed Apr 5 18:50:45 2017 [server] Peer Connection Initiated with [AF_INET]192.168.43.150:1194
Wed Apr 5 18:50:48 2017 SENT CONTROL [server]: 'PUSH_REQUEST' (status=1)
Wed Apr 5 18:50:48 2017 PUSH: Received control message: 'PUSH_REPLY,redirect-gateway def1 bypass-dhcp,dhcp-option DNS 8.8.8.8,dhcp-option DNS 8.8.4.4,route-gateway 10.8.0.1,topology subnet,ping 10,ping-restart 120,ifconfig 10.8.0.2 255.255.255.0'
Wed Apr 5 18:50:48 2017 OPTIONS IMPORT: timers and/or timeouts modified
Wed Apr 5 18:50:48 2017 OPTIONS IMPORT: --ifconfig/up options modified
Wed Apr 5 18:50:48 2017 OPTIONS IMPORT: route options modified
Wed Apr 5 18:50:48 2017 OPTIONS IMPORT: route-related options modified
Wed Apr 5 18:50:48 2017 OPTIONS IMPORT: --ip-win32 and/or --dhcp-option options modified
Wed Apr 5 18:50:48 2017 ROUTE_GATEWAY 192.168.43.1/255.255.255.0 IFACE=enp0s3 HWADDR=08:00:27:28:98:6b
Wed Apr 5 18:50:48 2017 TUN/TAP device tun0 opened
Wed Apr 5 18:50:48 2017 TUN/TAP TX queue length set to 100
Wed Apr 5 18:50:48 2017 do_ifconfig, tt->ipv6=0, tt->did_ifconfig_ipv6_setup=0
Wed Apr 5 18:50:48 2017 /usr/sbin/ip link set dev tun0 up mtu 1500
Wed Apr 5 18:50:48 2017 /usr/sbin/ip addr add dev tun0 10.8.0.2/24 broadcast 10.8.0.255
Wed Apr 5 18:50:48 2017 /usr/sbin/ip route add 192.168.43.150/32 dev enp0s3
Wed Apr 5 18:50:48 2017 /usr/sbin/ip route add 0.0.0.0/1 via 10.8.0.1
Wed Apr 5 18:50:48 2017 /usr/sbin/ip route add 128.0.0.0/1 via 10.8.0.1
Wed Apr 5 18:50:48 2017 Initialization Sequence Completed
 
Now, check if tun0(VPN interface) is created, and check the VPN interface IP address using ‘ip addr’ command:
 
ip addr
 
Sample output:
 
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
  valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
  valid_lft forever preferred_lft forever
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP  qlen 1000
  link/ether 08:00:27:28:98:6b brd ff:ff:ff:ff:ff:ff
  inet 192.168.43.199/24 brd 192.168.43.255 scope global dynamic enp0s3
  valid_lft 42359sec preferred_lft 42359sec
  inet6 fe80::a00:27ff:fe28:986b/64 scope link
  valid_lft forever preferred_lft forever
3: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 100
  link/none
  inet 10.8.0.2/24 brd 10.8.0.255 scope global tun0
  valid_lft forever preferred_lft forever
 
As you can see in the above output, Our VPN server automatically assigned an IP address 10.8.0.2 to the VPN client.
 
Now, try to ping the VPN server from your VPN client system:


  ping -c3 10.8.0.1
  ping -c3 10.8.0.1
Line 200: Line 122:


  PING 10.8.0.1 (10.8.0.1) 56(84) bytes of data.
  PING 10.8.0.1 (10.8.0.1) 56(84) bytes of data.
  64 bytes from 10.8.0.1: icmp_seq=1 ttl=64 time=1.05 ms
  64 bytes from 10.8.0.1: icmp_seq=1 ttl=64 time=0.539 ms
  64 bytes from 10.8.0.1: icmp_seq=2 ttl=64 time=1.94 ms
  64 bytes from 10.8.0.1: icmp_seq=2 ttl=64 time=1.17 ms
  64 bytes from 10.8.0.1: icmp_seq=3 ttl=64 time=2.49 ms
  64 bytes from 10.8.0.1: icmp_seq=3 ttl=64 time=0.921 ms
   
   
  --- 10.8.0.1 ping statistics ---
  --- 10.8.0.1 ping statistics ---
  3 packets transmitted, 3 received, 0% packet loss, time 2001ms
  3 packets transmitted, 3 received, 0% packet loss, time 2007ms
  rtt min/avg/max/mdev = 1.057/1.832/2.495/0.594 ms
  rtt min/avg/max/mdev = 0.539/0.878/1.176/0.264 ms


Congratulations! We have now successfully installed and configured OpenVPN server and client in CentOS. This method is same for DEB based systems such as Ubuntu and Linux Mint. Unlike the manual installation, this script makes the the openvpn installation and configuration much easier.
Cek routing


Cheers!
route -n


Sample output


Kernel IP routing table
Destination    Gateway        Genmask        Flags Metric Ref    Use Iface
0.0.0.0        10.8.0.1        128.0.0.0      UG    0      0        0 tun0


Anda sudah tersambung ke VPN dengan IP 10.8.0.0/24


==Referensi==
==Referensi==
Line 221: Line 149:
==Pranala Menarik==
==Pranala Menarik==


* [[OpenVPN]]
* [[OpenVPN: IPv4 /32 single client]]
* [[IPv6]]
* [[OpenVPN: IPv4 /32 multi-client]]
* [[OpenVPN: IPv4 routed LAN]]
* [[OpenVPN: IPv4 routed 2 LAN]]
* [[OpenVPN: IPv6 /128 single client]]
* [[OpenVPN: IPv6 routed LAN]]
* [[OpenVPN: IPv6 routed 2 LAN]]
 
* [[IPv6: OpenVPN: Ubuntu roadwarrior]]
* [[OpenVPN: Simple Server using Script]]
* [[OpenVPN: Free VPN untuk Ubuntu]]
* [[Instalasi OpenVPN]]
* [[Instalasi OpenVPN Client di Linux]]
* [[Capture Screen Proses Instalasi OpenVPN di Windows]]
* [[Instalasi OpenVPN di Windows]]
* [[WNDW: OpenVPN]]
* [[OpenVPN: Instalasi di Ubuntu 16.04]]
* [[OpenVPN: Instalasi di Ubuntu 18.04]]
* [[OpenVPN: Briding dan Routing]]

Latest revision as of 01:17, 31 March 2020

sumber: https://www.ostechnix.com/easiest-way-install-configure-openvpn-server-linux/


Topology

CLIENT 1 ------- HOST A ---------------- HOST B
                 ovpn server             ovpn client

Host A akan berfungsi sebagai OpenVPN Server. 

OS : Ubuntu 18.04
IP : 192.168.0.239/24
hostname : vpnserver


Host B akan berfungsi sebagai OpenVPN client 

OS : Ubuntu 18.04
IP : 192.168.0.237/24

Instal & Konfigurasi OpenVPN Server

Download script openvpn-install dari github 

sudo su
apt install openssh-server openvpn

cd /usr/local/src
wget https://git.io/vpn -O openvpn-install.sh
bash openvpn-install.sh

Jawab pertanyaan: 

IP address: 192.168.0.239
Public IP address / hostname: vpnserver
Protocol [1-2]: 1 -- UDP
Port: 1194
DNS [1-5]: 1
Client name: client
Press any key to continue...  <ENTER>

Maka akan tampak file client.ovpn, di 

/root/client.ovpn

Install openssh-server di client, copykan client.ovpn ke client 

scp client.ovpn root@192.168.0.237:


Reboot 

shutdown -r now

Cek kondisi jaringan 

ifconfig

Akan muncul interface tun0 

tun0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST>  mtu 1500
        inet 10.8.0.1  netmask 255.255.255.0  destination 10.8.0.1
        inet6 fe80::eaaa:77ed:ba02:748  prefixlen 64  scopeid 0x20<link>
        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 100  (UNSPEC)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 6  bytes 288 (288.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Konfigurasi OpenVPN Client

Pastikan openvpn terinstalsi 

sudo su
apt install openssh-server openvpn

Edit /etc/hosts isi dengan nama OpenVPN server 

192.168.0.239 vpnserver


Jalankan OpenVPN client 

cd ~
sudo su
openvpn --config client.ovpn

Akan keluar kira-kira 

..
..
Sat Feb 16 08:24:45 2019 TUN/TAP device tun0 opened
Sat Feb 16 08:24:45 2019 TUN/TAP TX queue length set to 100
Sat Feb 16 08:24:45 2019 do_ifconfig, tt->did_ifconfig_ipv6_setup=0
Sat Feb 16 08:24:45 2019 /sbin/ip link set dev tun0 up mtu 1500
Sat Feb 16 08:24:45 2019 /sbin/ip addr add dev tun0 10.8.0.2/24 broadcast 10.8.0.255
Sat Feb 16 08:24:45 2019 /sbin/ip route add 192.168.0.239/32 dev enp0s3
Sat Feb 16 08:24:45 2019 /sbin/ip route add 0.0.0.0/1 via 10.8.0.1
Sat Feb 16 08:24:45 2019 /sbin/ip route add 128.0.0.0/1 via 10.8.0.1
Sat Feb 16 08:24:45 2019 WARNING: this configuration may cache passwords in memory -- use the auth-nocache option to prevent this
Sat Feb 16 08:24:45 2019 Initialization Sequence Completed

Cek interface, akan muncul tun0 

ifconfig

tun0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST>  mtu 1500
        inet 10.8.0.2  netmask 255.255.255.0  destination 10.8.0.2
        inet6 fe80::28c4:3e38:2497:e12a  prefixlen 64  scopeid 0x20<link>
        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 100  (UNSPEC)
        RX packets 51  bytes 11522 (11.5 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 134  bytes 43524 (43.5 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Cek sambungan 

ping -c3 10.8.0.1

Sample output: 

PING 10.8.0.1 (10.8.0.1) 56(84) bytes of data.
64 bytes from 10.8.0.1: icmp_seq=1 ttl=64 time=0.539 ms
64 bytes from 10.8.0.1: icmp_seq=2 ttl=64 time=1.17 ms
64 bytes from 10.8.0.1: icmp_seq=3 ttl=64 time=0.921 ms

--- 10.8.0.1 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2007ms
rtt min/avg/max/mdev = 0.539/0.878/1.176/0.264 ms

Cek routing 

route -n

Sample output 

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         10.8.0.1        128.0.0.0       UG    0      0        0 tun0


Anda sudah tersambung ke VPN dengan IP 10.8.0.0/24

Referensi

Pranala Menarik

Retrieved from "https://lms.onnocenter.or.id/wiki/index.php?title=OpenVPN:_IPv4_/32_single_client&oldid=60657"