2026-02-10 08:46:58 +08:00 · 2015-02-19 16:16:13 +01:00
parent 35817b9642
commit 08d4f7cfe3
8 changed files with 533 additions and 249 deletions
							
							
								
							
							
						
@@ -11,16 +11,16 @@ EXTRA_DIST = ca-key.pem ca.pem common.sh server-cert.pem server-key.pem test1.co
SUBDIRS = docker-ocserv docker-kerberos
dist_check_SCRIPTS = test-pass test-pass-cert test-cert test-iroute test-pass-script \
	test-multi-cookie test-pam test-stress full-test test-group-pass test-pass-group-cert \
	test-multi-cookie test-stress full-test test-group-pass test-pass-group-cert \
	ocpasswd-test test-pass-group-cert-no-pass unix-test test-pass-opt-cert \
	test-cookie-timeout test-cookie-timeout-2 radius-test test-explicit-ip \
	radius-test test-gssapi kerberos-test
	radius-test test-gssapi kerberos-test pam-test
TESTS = test-pass test-pass-cert test-cert test-iroute test-pass-script \
	test-multi-cookie full-test test-group-pass test-pass-group-cert \
	ocpasswd-test test-pass-group-cert-no-pass unix-test test-pass-opt-cert \
	test-cookie-timeout test-cookie-timeout-2 test-explicit-ip radius-test \
	test-gssapi kerberos-test
	test-gssapi kerberos-test pam-test
TESTS_ENVIRONMENT = srcdir="$(srcdir)" \
	top_builddir="$(top_builddir)"
							
							
							
						
 
							
							
							
						
@@ -0,0 +1,35 @@
FROM fedora:21
RUN yum install -y gnutls gnutls-utils protobuf-c iproute pcllib http-parser tcp_wrappers pam systemd libseccomp
RUN yum install -y bash openssh-server nuttcp
RUN yum install -y libnl3 libtalloc
RUN yum install -y lz4
RUN yum install -y pam
RUN yum install -y freeradius-client
RUN systemctl enable sshd
RUN sed 's/PermitRootLogin without-password/PermitRootLogin yes/g' -i /etc/ssh/sshd_config
RUN echo 'root:root' |chpasswd
RUN useradd -m -d /home/admin -s /bin/bash admin
RUN echo 'admin:admin' |chpasswd
EXPOSE 5551
EXPOSE 5551/udp
EXPOSE 22
RUN mkdir /etc/ocserv
RUN useradd testuser
RUN echo 'testuser:testuser123' |chpasswd
ADD key.pem /etc/ocserv/
ADD cert.pem /etc/ocserv/
ADD ocserv-pam.conf /etc/ocserv/ocserv.conf
ADD pam-ocserv /etc/pam.d/ocserv
ADD ocserv /usr/sbin/
ADD ocpasswd /usr/bin/
ADD occtl /usr/bin/
ADD myscript /usr/bin/
# It's not possible to use mknod inside a container with the default LXC
# template, so we untar it from this archive.
ADD dev-tun.tgz /dev/
CMD nuttcp -S;sshd-keygen;/usr/sbin/sshd;mkdir -p /tmp/disconnect/;usr/sbin/ocserv -d 1 -f;sleep 3600
							
							
								
							
							
						
@@ -2,7 +2,7 @@ EXTRA_DIST = passwd ocserv.conf Dockerfile-debian-tcp dev-tun.tgz myscript key.p
	Dockerfile-debian-unix ocserv-unix.conf haproxy.cfg combo.pem Dockerfile-fedora-unix \
	Dockerfile-fedora-tcp freeradius-users Dockerfile-debian-radius Dockerfile-fedora-radius \
	freeradius-users ocserv-radius.conf radiusclient.conf radius-clients.conf \
	radiusclient-servers
	radiusclient-servers pam-ocserv ocserv-pam.conf
TESTS_ENVIRONMENT = srcdir="$(srcdir)" \
	top_builddir="$(top_builddir)"
							
							
							
						
 
							
							
							
						
@@ -0,0 +1,301 @@
# 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"
# Whether to enable support for the occtl tool (i.e., either through D-BUS,
# or via a unix socket).
use-occtl = true
# socket file used for IPC with occtl. You only need to set that,
# if you use more than a single servers.
#occtl-socket-file = /var/run/occtl.socket
# The plain option requires specifying a password file which contains
# entries of the following format.
# "username:groupname:encoded-password"
# One entry must be listed per line, and 'ocpasswd' can be used
# to generate password entries.
#auth = "plain[/etc/ocserv/ocpasswd]"
# 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
max-clients = 16
# 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 = 2
# TCP and UDP port number
tcp-port = 5551
udp-port = 5551
# Keepalive in seconds
keepalive = 32400
# Dead peer detection in seconds.
dpd = 240
# Dead peer detection for mobile clients. The needs to
# be much higher to prevent such clients being awaken too 
# often by the DPD messages, and save battery.
# (clients that send the X-AnyConnect-Identifier-DeviceType)
mobile-dpd = 1800
# 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 = /etc/ocserv/cert.pem
server-key = /etc/ocserv/key.pem
# 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, and is 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
# client certificates (public keys) if certificate authentication
# is set.
#ca-cert = /path/to/ca.pem
# 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
# The revocation list of the certificates issued by the 'ca-cert' above.
#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 allowed to stay idle (no traffic)
# before being disconnected. Unset to disable.
#idle-timeout = 1200
# The time (in seconds) that a mobile client is allowed to stay idle (no
# traffic) before being disconnected. Unset to disable.
#mobile-idle-timeout = 2400
# 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-validity = 86400
# 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 = 172800
# ReKey method
# Valid options: ssl, new-tunnel
#  ssl: Will perform an efficient rehandshake on the channel allowing
#       a seamless connection during rekey.
#  new-tunnel: Will instruct the client to discard and re-establish the channel.
#       Use this option only if the connecting clients have issues with the ssl
#       option.
rekey-method = ssl
# 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),
# ID (a unique numeric ID); 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
#
# The name of the tun device
device = vpns
# The default domain to be advertised
default-domain = example.com
# The pool of addresses that leases will be given from.
ipv4-network = 192.168.1.0
ipv4-netmask = 255.255.255.0
# The advertized DNS server. Use multiple lines for
# multiple servers.
# dns = fc00::4be0
#dns = 192.168.1.2
# The NBNS server (if any)
#nbns = 192.168.1.3
# The IPv6 subnet that leases will be given from.
ipv6-network = fd91:6d87:7341:db6a::
ipv6-prefix = 64
# 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
# Unset 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 = 40000
#tx-data-per-sec = 40000
# 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
# Routes to be forwarded to the client. If you need the
# client to forward routes to the server, you may use the 
# config-per-user/group or even connect and disconnect scripts.
#
# To set the server as the default gateway for the client just
# comment out all routes from the server.
route = 192.168.1.0/255.255.255.0
#route = 192.168.5.0/255.255.255.0
route = fd91:6d87:7341:db6a::/64
# 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, ipv4-netmask, ipv6-prefix, rx/tx-per-sec, iroute, route,
#  net-priority and cgroup.
#
# 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
#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. 
# It is not used by the openconnect client.
#user-profile = profile.xml
# Binary files that may be downloaded by the CISCO client. Must
# be within any chroot environment.
#binary-files = /path/to/binaries
# Unless set to false it is required for clients to present their
# certificate even if they are authenticating via a previously granted
# cookie and complete their authentication in the same TCP connection.
# Legacy CISCO clients do not do that, and thus this option should be 
# set for them.
#cisco-client-compat = false
#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"
							
							
							
						
@@ -0,0 +1,18 @@
#%PAM-1.0
auth [user_unknown=ignore success=ok ignore=ignore default=bad] pam_securetty.so
auth       substack     system-auth
auth       include      postlogin
account    required     pam_nologin.so
account    include      system-auth
password   include      system-auth
# pam_selinux.so close should be the first session rule
session    required     pam_selinux.so close
session    required     pam_loginuid.so
session    optional     pam_console.so
# pam_selinux.so open should only be followed by sessions to be executed in the user context
session    required     pam_selinux.so open
session    required     pam_namespace.so
session    optional     pam_keyinit.so force revoke
session    include      system-auth
session    include      postlogin
-session   optional     pam_ck_connector.so
							
							
							
						
@@ -0,0 +1,175 @@
#!/bin/sh
#
# Copyright (C) 2014 Red Hat
#
# This file is part of ocserv.
#
# ocserv is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at
# your option) any later version.
#
# ocserv is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with ocserv; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
srcdir=${srcdir:-.}
PORT_OCSERV=5551
#this test can only be run as root
id|grep root >/dev/null 2>&1
if [ $? != 0 ];then
	exit 77
fi
CONFIG="pam"
IMAGE=ocserv-pam-test
IMAGE_NAME=test_ocserv_pam
. ./docker-common.sh
$DOCKER run -P --privileged=true --tty=false -d --name test_ocserv_pam $IMAGE
if test $? != 0;then
	echo "Cannot run docker image"
	exit 1
fi
echo "ocserv image was run"
#wait for ocserv to server
sleep 5
IP=`$DOCKER inspect test_ocserv_pam | grep IPAddress | cut -d '"' -f 4`
if test -z "$IP";then
	echo "Detected IP is null!"
	stop
fi
echo "Detected IP: $IP"
printf "testuser\n" >pass-pam.tmp
openconnect $IP:$PORT_OCSERV -u testuser --passwd-on-stdin -v --servercert=d66b507ae074d03b02eafca40d35f87dd81049d3 --cookieonly < pass-pam.tmp
if test $? = 0;then
	echo "Authentication with wrong password succeeded!"
	stop
fi
printf "testuser123\n" >pass-pam.tmp
openconnect $IP:$PORT_OCSERV -u test --passwd-on-stdin -v --servercert=d66b507ae074d03b02eafca40d35f87dd81049d3 --cookieonly < pass-pam.tmp
if test $? = 0;then
	echo "Authentication with wrong username succeeded!"
	stop
fi
printf "testuser123\n" >pass-pam.tmp
openconnect $IP:$PORT_OCSERV -u testuser --passwd-on-stdin -v --servercert=d66b507ae074d03b02eafca40d35f87dd81049d3 < pass-pam.tmp &
PID=$!
rm -f pass-pam.tmp
#wait for openconnect
sleep 5
# The client IP depends on the username so it shouldn't change.
ping -w 5 192.168.1.1
if test $? != 0;then
	kill $PID
	echo "Cannot ping ocserv"
	stop
fi
ping -w 5 192.168.1.1 -s 1500
if test $? != 0;then
	kill $PID
	echo "Cannot ping ocserv"
	stop
fi
ping6 -w 5 fd91:6d87:7341:db6a::1
if test $? != 0;then
	kill $PID
	echo "Cannot ping the IPv6 of ocserv"
	stop
fi
echo "UserKnownHostsFile ./known-hosts.tmp" >config.tmp
printf "#\!/bin/sh\n" >echo-admin.tmp
printf "echo yes" >>echo-admin.tmp
printf "echo root" >>echo-admin.tmp
printf "\n" >>echo-admin.tmp
chmod 755 echo-admin.tmp
export SSH_ASKPASS="./echo-admin.tmp"
setsid ssh -T -F config.tmp root@192.168.1.1 occtl show user testuser >out.tmp 2>&1
cat out.tmp
printf "#\!/bin/sh\n" >echo-admin.tmp
printf "echo root" >>echo-admin.tmp
printf "\n" >>echo-admin.tmp
chmod 755 echo-admin.tmp
setsid ssh -T -F config.tmp root@192.168.1.1 occtl show user testuser >out.tmp 2>&1
cat out.tmp
rm -f echo-admin.tmp
rm -f config.tmp
rm -f known-hosts.tmp
grep "Username" out.tmp
if test $? != 0;then
	kill $PID
	echo "could not find user information"
	stop
fi
rm -f out.tmp
# There is an issue in nuttcp that makes it crash under docker if
# /proc/sys/net/ipv4/tcp_adv_win_scale does not exist.
if test "$FEDORA" = 1;then
nuttcp -T 10 -t 192.168.1.1
if test $? != 0;then
	kill $PID
	echo "Cannot send to ocserv"
	stop
fi
nuttcp -T 10 -r 192.168.1.1
if test $? != 0;then
	kill $PID
	echo "Cannot recv from ocserv"
	stop
fi
fi
sleep 2
kill $PID
sleep 4
#check whether /tmp/disconnect/ok was created
rm -f ./not-ok
$DOCKER cp test_ocserv_pam:/tmp/disconnect/not-ok ./
if test -f ./not-ok;then
	echo "There was an issue getting stats"
	stop
fi
rm -f ./not-ok
ret=0
rm -f ./tmp-full/ok
$DOCKER cp test_ocserv_pam:/tmp/disconnect/ok ./tmp-full/
if ! test -f ./tmp-full/ok;then
	echo "Don't know if stats were received"
	ret=77
else
	echo -n "stats: "
	echo `cat ./tmp-full/ok`
	rm -rf ./tmp-full/
fi
$DOCKER stop test_ocserv_pam
$DOCKER rm test_ocserv_pam
exit $ret
							
							
							
						
@@ -1,55 +0,0 @@
#!/bin/sh
#
# Copyright (C) 2013 Nikos Mavrogiannopoulos
#
# This file is part of ocserv.
#
# ocserv is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at
# your option) any later version.
#
# ocserv is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GnuTLS; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
SERV="${SERV:-../src/ocserv}"
srcdir=${srcdir:-.}
PORT=4444
. `dirname $0`/common.sh
echo "Testing PAM backend with username-password... "
launch_server -d 1 -f -c test-pam.config & PID=$!
wait_server $PID
echo "Connecting to obtain cookie... "
( echo "test" | openconnect --authgroup test -q localhost:$PORT -u test --servercert=d66b507ae074d03b02eafca40d35f87dd81049d3 --cookieonly >/dev/null 2>&1 ) ||
	fail $PID "Could not receive cookie from server"
echo "Connecting to obtain cookie with default group... "
( echo "test" | openconnect --authgroup DEFAULT -q localhost:$PORT -u test --servercert=d66b507ae074d03b02eafca40d35f87dd81049d3 --cookieonly >/dev/null 2>&1 ) ||
	fail $PID "Could not receive cookie from server"
echo "Connecting to obtain cookie with wrong group... "
( echo "test" | openconnect --authgroup daemon -q localhost:$PORT -u test --servercert=d66b507ae074d03b02eafca40d35f87dd81049d3 --cookieonly >/dev/null 2>&1 ) &&
	fail $PID "Received cookie when we shouldn't"
echo "Connecting to obtain cookie with wrong password... "
( echo "tost" | openconnect --authgroup test -q localhost:$PORT -u test --servercert=d66b507ae074d03b02eafca40d35f87dd81049d3 --cookieonly >/dev/null 2>&1 ) &&
	fail $PID "Received cookie when we shouldn't"
echo "Connecting to obtain cookie with wrong username... "
( echo "tost" | openconnect --authgroup DEFAULT -q localhost:$PORT -u tost --servercert=d66b507ae074d03b02eafca40d35f87dd81049d3 --cookieonly >/dev/null 2>&1 ) &&
	fail $PID "Received cookie when we shouldn't"
kill $PID
wait
exit 0
							
							
							
						
@@ -1,190 +0,0 @@
# User authentication method. Could be set multiple times and in that case
# all should succeed.
# Options: certificate, pam. 
#auth = "certificate"
auth = "pam"
select-group = test
select-group = daemon
# The name of the group that if selected it would allow to use
# the assigned by default group.
default-select-group = DEFAULT
# 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]
use-dbus = no
# Limit the number of clients. Unset or set to zero for unlimited.
#max-clients = 1024
max-clients = 16
# 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 = 2
# TCP and UDP port number
tcp-port = 4444
udp-port = 4444
# Keepalive in seconds
keepalive = 32400
# Dead peer detection in seconds
dpd = 440
# 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 = ./server-cert.pem
server-key = ./server-key.pem
# 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 = /path/to/ca.pem
# 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 = "PERFORMANCE:%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-validity = 172800
# 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
# PID file
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
# Network settings
device = vpns
# The default domain to be advertised
default-domain = example.com
ipv4-network = 192.168.1.0
ipv4-netmask = 255.255.255.0
# Use the keywork local to advertize the local P-t-P address as DNS server
ipv4-dns = 192.168.1.1
# The NBNS server (if any)
#ipv4-nbns = 192.168.2.3
#ipv6-address = 
#ipv6-mask = 
#ipv6-dns = 
# 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 = 
route = 192.168.1.0/255.255.255.0
#route = 192.168.5.0/255.255.255.0
#
# The following options are for (experimental) AnyConnect client 
# compatibility. They are only available if the server is built 
# with --enable-anyconnect
#
# 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.
#always-require-cert = false