sample Ocserv config file

gistfile1.txt

# User authentication method. Could be set multiple times and in that case
# all should succeed.
# Options: certificate, pam.
#auth = "certificate"
auth = "plain[/etc/ocserv/passwd]"
#auth = "pam"

# A banner to be displayed on clients
#banner = "Welcome"

# Use listen-host to limit to specific IPs or to the IPs of a provided hostname.
#listen-host = [IP|HOSTNAME]

# Limit the number of clients. Unset or set to zero for unlimited.
max-clients = 1024

# Limit the number of client connections to one every X milliseconds
# (X is the provided value). Set to zero for no limit.
#rate-limit-ms = 100

# Limit the number of identical clients (i.e., users connecting multiple times)
# Unset or set to zero for unlimited.
max-same-clients = 0

# TCP and UDP port number
tcp-port = 443
udp-port = 443

# Keepalive in seconds
keepalive = 32400

# Dead peer detection in seconds
dpd = 90

# MTU discovery (DPD must be enabled)
try-mtu-discovery = false

# The key and the certificates of the server
# The key may be a file, or any URL supported by GnuTLS (e.g.,
# tpmkey:uuid=xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxx;storage=user
# or pkcs11:object=my-vpn-key;object-type=private)
#
# There may be multiple certificate and key pairs and each key
# should correspond to the preceding certificate.
server-cert = /path/to/crt_file
server-key = /path/to/key_file

# Diffie-Hellman parameters. Only needed if you require support
# for the DHE ciphersuites (by default this server supports ECDHE).
# Can be generated using:
# certtool --generate-dh-params --outfile /path/to/dh.pem
#dh-params = /path/to/dh.pem

# If you have a certificate from a CA that provides an OCSP
# service you may provide a fresh OCSP status response within
# the TLS handshake. That will prevent the client from connecting
# independently on the OCSP server.
# You can update this response periodically using:
# ocsptool --ask --load-cert=your_cert --load-issuer=your_ca --outfile response
# Make sure that you replace the following file in an atomic way.
#ocsp-response = /path/to/ocsp.der

# In case PKCS #11 or TPM keys are used the PINs should be available
# in files. The srk-pin-file is applicable to TPM keys only (It's the storage
# root key).
#pin-file = /path/to/pin.txt
#srk-pin-file = /path/to/srkpin.txt

# The Certificate Authority that will be used
# to verify clients if certificate authentication
# is set.
#ca-cert = ./alphassl.crt

# The object identifier that will be used to read the user ID in the client certificate.
# The object identifier should be part of the certificate's DN
# Useful OIDs are:
# CN = 2.5.4.3, UID = 0.9.2342.19200300.100.1.1
#cert-user-oid = 0.9.2342.19200300.100.1.1

# The object identifier that will be used to read the user group in the client
# certificate. The object identifier should be part of the certificate's DN
# Useful OIDs are:
# OU (organizational unit) = 2.5.4.11
#cert-group-oid = 2.5.4.11

# A revocation list of ca-cert is set
#crl = /path/to/crl.pem

# GnuTLS priority string
tls-priorities = "NORMAL:%SERVER_PRECEDENCE:%COMPAT"

# To enforce perfect forward secrecy (PFS) on the main channel.
#tls-priorities = "NORMAL:%SERVER_PRECEDENCE:%COMPAT:-RSA"

# The time (in seconds) that a client is allowed to stay connected prior
# to authentication
auth-timeout = 40

# The time (in seconds) that a client is not allowed to reconnect after
# a failed authentication attempt.
#min-reauth-time = 2

# Cookie validity time (in seconds)
# Once a client is authenticated he's provided a cookie with
# which he can reconnect. This option sets the maximum lifetime
# of that cookie.
cookie-timeout = 86400000

# ReKey time (in seconds)
# ocserv will ask the client to refresh keys periodically once
# this amount of seconds is elapsed. Set to zero to disable.
rekey-time = 86400000

# Script to call when a client connects and obtains an IP
# Parameters are passed on the environment.
# REASON, USERNAME, GROUPNAME, HOSTNAME (the hostname selected by client),
# DEVICE, IP_REAL (the real IP of the client), IP_LOCAL (the local IP
# in the P-t-P connection), IP_REMOTE (the VPN IP of the client). REASON
# may be "connect" or "disconnect".
#connect-script = /usr/bin/myscript
#disconnect-script = /usr/bin/myscript

# UTMP
use-utmp = true

# D-BUS usage. If disabled occtl tool cannot be used. If enabled
# then ocserv must have access to register org.infradead.ocserv
# D-BUS service. See doc/dbus/org.infradead.ocserv.conf
use-dbus = false

# PID file. It can be overriden in the command line.
pid-file = /var/run/ocserv.pid

# The default server directory. Does not require any devices present.
#chroot-dir = /path/to/chroot

# socket file used for IPC, will be appended with .PID
# It must be accessible within the chroot environment (if any)
socket-file = /var/run/ocserv-socket

# The user the worker processes will be run as. It should be
# unique (no other services run as this user).
run-as-user = nobody
run-as-group = daemon

# Set the protocol-defined priority (SO_PRIORITY) for packets to
# be sent. That is a number from 0 to 6 with 0 being the lowest
# priority. Alternatively this can be used to set the IP Type-
# Of-Service, by setting it to a hexadecimal number (e.g., 0x20).
# This can be set per user/group or globally.
#net-priority = 3

# Set the VPN worker process into a specific cgroup. This is Linux
# specific and can be set per user/group or globally.
#cgroup = "cpuset,cpu:test"

# Network settings

device = vpns

# The default domain to be advertised
#default-domain = example.com

ipv4-network = 10.18.240.0
ipv4-netmask = 255.255.255.0

# dns = 192.168.2.1
#dns = 192.168.1.1
#dns = fe80::1
dns = 203.80.96.10
dns = 8.8.8.8
dns = 8.8.4.4

# The NBNS server (if any)
#nbns = 192.168.2.3

# The IPv6 subnet prefix
#ipv6-network = fe80::
#ipv6-prefix = 16

# The domains over which the provided DNS should be used. Use
# multiple lines for multiple domains.
#split-dns = example.com

# Prior to leasing any IP from the pool ping it to verify that
# it is not in use by another (unrelated to this server) host.
ping-leases = false

# Leave empty to assign the default MTU of the device
# mtu =

# Unset to enable bandwidth restrictions (in bytes/sec). The
# setting here is global, but can also be set per user or per group.
#rx-data-per-sec = 40960
#tx-data-per-sec = 40960

# The number of packets (of MTU size) that are available in
# the output buffer. The default is low to improve latency.
# Setting it higher will improve throughput.
output-buffer = 10

#route = 192.168.1.0/255.255.255.0
#route = 192.168.5.0/255.255.255.0

# Configuration files that will be applied per user connection or
# per group. Each file name on these directories must match the username
# or the groupname.
# The options allowed in the configuration files are dns, nbns,
# ipv?-network, ipv?-netmask, ipv6-prefix, rx/tx-per-sec, iroute and route.
#
# Note that the 'iroute' option allows to add routes on the server
# based on a user or group. The syntax depends on the input accepted
# by the commands route-add-cmd and route-del-cmd (see below).

#config-per-user = /etc/ocserv/config-per-user/
#config-per-group = /etc/ocserv/config-per-group/

# The system command to use to setup a route. %R will be replaced with the
# route/mask and %D with the (tun) device.
#
# The following example is from linux systems. %R should be something
# like 192.168.2.0/24 (so iroute in this system has different syntax than route)

route-add-cmd = "ip route add %R dev %D"
route-del-cmd = "ip route delete %R dev %D"

#
# The following options are for (experimental) AnyConnect client
# compatibility.

# Client profile xml. A sample file exists in doc/profile.xml.
# This file must be accessible from inside the worker's chroot.
# The profile is ignored by the openconnect client.
#user-profile = profile.xml

# Unless set to false it is required for clients to present their
# certificate even if they are authenticating via a previously granted
# cookie. Legacy CISCO clients do not do that, and thus this option
# should be set for them.
cisco-client-compat = true

#Advanced options

# Option to allow sending arbitrary custom headers to the client after
# authentication and prior to VPN tunnel establishment.
#custom-header = "X-My-Header: hi there"
custom-header = "X-DTLS-MTU: 1200"
custom-header = "X-CSTP-MTU: 1200"