OpenVPN between Mikrotik and OpenWRT: Difference between revisions

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Brian Wilson (talk | contribs)
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== Creating the certificate and key files ==
== Creating the certificate and key files ==


I do this on a Ubuntu Linux box, it's the easiest way. It is also possible to install easy-rsa on the OpenWRT device
I used the instructions on this http://wiki.mikrotik.com/wiki/Manual:Create_Certificates page.
and create the files there.  


This [http://wiki.mikrotik.com/wiki/OpenVPN#Creating Certificates with Easy-RSA Mikrotik page] has instructions on how to create the keys. Here is an abridged version.
I used CDS Wireless for the ca.crt CN and cds1.net for the client and server certificate CN.
 
sudo -i
apt-get install openvpn easy-rsa
cd /usr/share
cp -r easy-rsa /etc/openvpn
cd /etc/openvpn/easy-rsa
emacs vars
source vars
# This creates the ca.crt file in keys/
./pkitool --initca
 
Create the files for the Mikrotik RB750 "server"; remember your password!
./pkitool --pass --server rb750
# Convert key file to pem file format
openssl rsa -in keys/rb750.key -out keys/rb750.pem
# Create files for the OpenWRT "client"
./pkitool openwrt
openssl rsa -in keys/openwrt.key -out keys/openwrt.pem
./build-dh
 
# Copy the server files to the rb750
cd keys
ftp 76.0.0.2
bin
put rb750.crt
put rb750.pem
put ca.crt
cd ..
# Copy the client files to the router
cd keys
scp openwrt.crt openwrt.pem ca.crt 192.168.56.101:/tmp


== The OpenWRT router ==
== The OpenWRT router ==
Line 83: Line 49:
  mkdir /etc/openvpn
  mkdir /etc/openvpn
  mv /tmp/openwrt.* /tmp/ca.crt /etc/openvpn
  mv /tmp/openwrt.* /tmp/ca.crt /etc/openvpn
== A Debian client ==
When I could not get the OpenWRT and Mikrotik devices to talk, I backed off on the OpenWrt side
and used the Debian Server as an OpenVPN client.


== The Mikrotik router ==
== The Mikrotik router ==
Line 91: Line 62:


  /certificate
  /certificate
  import file=rb750.crt
  import file-name=cdswireless.crt
  import file=rb750.pem
  import file-name=cdswireless.key
  import file=ca.crt
  import file-name=ca.crt
set 0 name=cdswireless
set 1 name=ca
   
   
  # This will let you have many OpenVPN clients
  # This will let you have many OpenVPN clients
Line 99: Line 72:
   
   
  /ppp profile  
  /ppp profile  
  add change-tcp-mss=default comment="" local-address=192.168 \
  add change-tcp-mss=default local-address=10.8.0.1 \
  name="ovpn_profile" only-one=default remote-address=ovpn-pool \
  name="ovpn_profile" only-one=default remote-address=ovpn-pool \
  use-compression=default use-encryption=required use-vj-compression=default
  use-compression=default use-encryption=required use-vj-compression=default
Line 108: Line 81:
  # If you don't already have these defined,  
  # If you don't already have these defined,  
  /ip address
  /ip address
  add address=10.8.0.1/24 interface=ether1 comment="Tunnel"
  add address=192.168.4.253/24 comment="Management LAN" interface=ether1 network=192.168.4.0
  add address=192.168.2.1/24 interface=ether1 comment="LAN"  
  add address=192.168.2.1/24 comment="CDS LAN" interface=ether2 network=192.168.2.0
  add address=76.0.0.2/24 interface=ether2 comment="Internet"
  add address=172.16.1.1/24 comment=Internet interface=ether3 network=172.16.1.0


  /ip route
  /ip route
# This is how we really reach the Internet
add distance=1 gateway=192.168.4.254
  add dst-address=10.8.0.0/24 gateway=10.8.0.1 comment="OVPN"
  add dst-address=10.8.0.0/24 gateway=10.8.0.1 comment="OVPN"
add dst-address=192.168.4.0/24 gateway=10.8.0.1 comment="OVPN"
 
add gateway=76.0.0.2 comment="Internet"
I think when I "enable" this then port 1194 should light up? Hopefully on the Internet interface
since that's where the OpenVPN client attempting to connect.


  /interface ovpn-server server  
  /interface ovpn-server server  
  set auth=sha1,md5 certificate=router_cert \
  set auth=sha1,md5 certificate=cdswireless \
  cipher=blowfish128,aes128,aes192,aes256 default-profile=ovpn_profile \
  cipher=blowfish128,aes128,aes192,aes256 default-profile=ovpn_profile \
  enabled=yes keepalive-timeout=disabled max-mtu=1500 mode=ip netmask=29 \
  enabled=yes keepalive-timeout=disabled max-mtu=1500 mode=ip netmask=27 \
  port=1194 require-client-certificate=no
  port=1194 require-client-certificate=no


# I have the firewall turned off for testing right now.
# When I activate the firewall I will need this
  /ip firewall filter  
  /ip firewall filter  
  add action=accept chain=input comment="OpenVPN" disabled=no dst-port=1194 protocol=udp
  add action=accept chain=input comment="OpenVPN" disabled=no dst-port=1194 protocol=udp


== The "remote" server ==
== The "remote" server ==

Revision as of 04:19, 23 December 2014

This is a page full of details, for the intro and how to set up Windows and Linux clients, see OpenVPN.

I am writing this while testing with three virtual machines on a Mac. Once I have the steps down, I will be transferring everything over to a Buffalo WZR WiFi access point running OpenWRT 14.xx and a Mikrotik RB750 running RouterOS 5.27.

I am running my virtual machines on VirtualBox. I use images downloaded from OpenWRT and Mikrotik and install them into very minimal setups. This is handy, they boot FAST and I don't risk cutting myself off from the remote end as I do tests and experiment.

The main reasons I chose to use OpenVPN over other options (today) are:

  1. I can directly route packets so I don't need to mess with NAT at one end as with PPTP
  2. My endpoint is hiding behind several layers of access points and routers that I don't control. OpenVPN works fine in this case.

The virtual network

Plover (Macintosh)
   192.168.56.1

    LAN (This will be the LAN in my house)

   192.168.56.101
VM1 = Router #1, OpenWRT Barrier Breaker
     76.0.0.1

     Internet

     76.0.0.2
VM2 = Router #2, Mikrotik RouterOS 6.23
    192.168.2.1

    REMOTE LAN (this will be the CDS OFFICE LAN)

   192.168.2.2
VM3 = Remote Debian server

Creating the certificate and key files

I used the instructions on this http://wiki.mikrotik.com/wiki/Manual:Create_Certificates page.

I used CDS Wireless for the ca.crt CN and cds1.net for the client and server certificate CN.

The OpenWRT router

Refer to http://wiki.openwrt.org/doc/howto/vpn.openvpn I am not going to copy all the instructions here, just go look at that page now. 

ssh [email protected]
opkg update
opkg install openvpn-openssl
mkdir /etc/openvpn
mv /tmp/openwrt.* /tmp/ca.crt /etc/openvpn

A Debian client

When I could not get the OpenWRT and Mikrotik devices to talk, I backed off on the OpenWrt side and used the Debian Server as an OpenVPN client.

The Mikrotik router

Refer to same Mikrotik page as mentioned above, http://wiki.mikrotik.com/wiki/OpenVPN

Import the three files transferred in the "create" section above. 

/certificate
import file-name=cdswireless.crt
import file-name=cdswireless.key
import file-name=ca.crt
set 0 name=cdswireless
set 1 name=ca

# This will let you have many OpenVPN clients
/ip pool add name=ovpn-pool ranges=10.10.10.2-10.10.10.50

/ppp profile 
add change-tcp-mss=default local-address=10.8.0.1 \
name="ovpn_profile" only-one=default remote-address=ovpn-pool \
use-compression=default use-encryption=required use-vj-compression=default
/ppp secret 
add caller-id="" comment="" disabled=no limit-bytes-in=0 \
limit-bytes-out=0 name="ovpn" password="password" routes="" service=any

# If you don't already have these defined, 
/ip address
add address=192.168.4.253/24 comment="Management LAN" interface=ether1 network=192.168.4.0
add address=192.168.2.1/24 comment="CDS LAN" interface=ether2 network=192.168.2.0
add address=172.16.1.1/24 comment=Internet interface=ether3 network=172.16.1.0

/ip route
# This is how we really reach the Internet
add distance=1 gateway=192.168.4.254
add dst-address=10.8.0.0/24 gateway=10.8.0.1 comment="OVPN"

I think when I "enable" this then port 1194 should light up? Hopefully on the Internet interface since that's where the OpenVPN client attempting to connect. 

/interface ovpn-server server 
set auth=sha1,md5 certificate=cdswireless \
cipher=blowfish128,aes128,aes192,aes256 default-profile=ovpn_profile \
enabled=yes keepalive-timeout=disabled max-mtu=1500 mode=ip netmask=27 \
port=1194 require-client-certificate=no

# I have the firewall turned off for testing right now.
# When I activate the firewall I will need this
/ip firewall filter 
add action=accept chain=input comment="OpenVPN" disabled=no dst-port=1194 protocol=udp

The "remote" server

I have a generic Debian server installed already in a VirtualBox machine, so I used it as the far end of my network to allow me to test connectivity through the two routers.

Tests

Start the client 

/etc/init.d/openvpn start
cat /tmp/openvpn.log
ifconfig tun0

Make sure you can reach each of the routers and the Debian server from the Mac, and that you can reach each of the routers and the Mac from the Debian server.

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