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masterthesis/openvpn-config/server.conf

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# Listen on 1194 for both IPv4 and IPv6
port 1194
proto udp
proto udp6
# Since we have more than one ip address, this makes openvpn respond
# with the right sender address
multihome
# We're using the virtual network interface on layer 3
dev tun
# Certificates to use. Paths are relative to config file location.
ca inform/ca.crt
cert inform/aither.inform.hs-hannover.de.crt
key inform/aither.inform.hs-hannover.de.key
# Assume server role in tls handshake
tls-server
# Diffie-Hellman parameter file
# (not needed for TLS cipher with ECDHE instead of DHE)
dh inform/dh.pem
# Certificate revocation list location
# Make sure this file is always valid, otherwise OpenVPN refuses to (re)start!
crl-verify inform/crl.pem
# Make sure the client presents a certificate with "client role"
remote-cert-tls client
# Allow multiple connections using the same certificate?
# There is no reason to not allow this, so it is allowed.
duplicate-cn
# We're using subnet topology for IPv4 tunnel connectivity
topology subnet
# Use this IPv4 range for clients (/16, so we can cope with potential 500 clients)
server 10.2.0.0 255.255.0.0
# Use this IPv6 network for clients
server-ipv6 2001:638:614:1750::/64
# Make sure the client can still reach the OpenVPN server via its IPv4 default gateway
# This is needed because the IPv4 route for DMZ is pushed below,
# which overlaps the OpenVPN server IPv4 address.
push "route remote_host 255.255.255.255 net_gateway"
# Push routes for local IPv4 networks
#
# DMZ
push "route 141.71.38.0 255.255.255.0 vpn_gateway"
# Inform
push "route 141.71.30.0 255.255.254.0 vpn_gateway"
# Edu
push "route 192.168.99.0 255.255.255.0 vpn_gateway"
# NAO
push "route 192.168.90.0 255.255.255.0 vpn_gateway"
# iDrac
push "route 192.168.70.0 255.255.255.0 vpn_gateway"
# Cluster
push "route 10.0.20.0 255.255.255.0 vpn_gateway"
# educloud
push "route 10.0.30.0 255.255.255.0 vpn_gateway"
# experimental ipv6 network
push "route 10.0.40.0 255.255.255.0 vpn_gateway"
# server network from H-IT for KMS
push "route 141.71.2.0 255.255.255.0 vpn_gateway"
# Push routes for local IPv6 networks
# (The vpn_gateway placeholder does not work here.)
# Note: IPv6 routes that overlap the IPv6 address of the OpenVPN server will
# automatically trigger creating a direct route to the OpenVPN server on the client.
#
# DMZ
push "route-ipv6 2001:638:614:1780::/64 2001:638:614:1750::1"
# Inform
push "route-ipv6 2001:638:614:1720::/64 2001:638:614:1750::1"
# Edu
push "route-ipv6 2001:638:614:1721::/64 2001:638:614:1750::1"
# NAO
push "route-ipv6 2001:638:614:1722::/64 2001:638:614:1750::1"
# Cluster
push "route-ipv6 2001:638:614:1743::/64 2001:638:614:1750::1"
# experimental ipv6 network
push "route-ipv6 2001:638:614:1744::/64 2001:638:614:1750::1"
### START BLOCK CRYPTOGRAPHY
# Specific settings regarding TLS, chiphers and hash algorithms
# DO NOT CHANGE THIS unless you receive explicit instructions to do so
# These settings need to be identical in client and server configuration!
# Protect data channel with this cipher
cipher AES-256-GCM
# Authenticate packets in data and control channel using HMAC with this
# message digest algorithm
auth SHA256
# Use this specific cipher to secure the control channel
tls-cipher TLS-DHE-RSA-WITH-AES-256-GCM-SHA384
# Only allow TLS version 1.2 and higher
tls-version-min "1.2"
### END BLOCK CRYPTOGRAPHY
# Disable cipher negotiation on server side
ncp-disable
# Send ping message every ten seconds, expect session loss after 60 seconds of no response
keepalive 10 60
# Notify clients when the server restarts or shuts down.
# Default behaviour: Tell clients to try to connect to the same server again.
explicit-exit-notify 1
# Enable these if you plan to enable running on reduced privileges
# These options allow to keep the private key and the virtual network device handle in memory
persist-key
persist-tun
# Reduce privileges after launch (uncomment and adapt on unix/linux system)
user nobody
group nogroup
# Logging settings
verb 3
mute 5
# Print a list of active sessions into this file
# This might be helpful if you plan big maintenance
status inform/status.log