ocserv/ocserv.conf

# User authentication method. Could be set multiple times and in 
# that case all should succeed. To enable multiple methods use
# multiple auth directives. Available options: certificate, certificate[optional],
# plain, pam, radius[configfile,groupconfig]. 

# certificate:
#  This indicates that all connecting users must present a certificate.
#
# certificate[optional]:
#  This indicates that a user may present a certificate. When that option
# is set, individual users or user groups can be forced to present a valid
# certificate by adding "require-cert=true" in the per-user configuration file.
#
# pam[gid-min=1000]:
#  The gid-min option is used by auto-select-group option, in order to
# select the minimum valid group ID.
#
# plain[/etc/ocserv/ocpasswd]
#  The plain option requires specifying a password file which contains
# entries of the following format.
# "username:groupname1,groupname2:encoded-password"
# One entry must be listed per line, and 'ocpasswd' should be used
# to generate password entries.
#
# radius[/etc/radiusclient/radiusclient.conf,groupconfig]:
#  The radius option requires specifying freeradius-client configuration
# file. If the groupconfig option is set, then config-per-user will be overriden,
# and all configuration will be read from radius. The supported atributes for
# radius configuration are:
# Group-Name, Framed-IPv6-Address, Framed-IPv6-Prefix, DNS-Server-IPv6-Address,
# Framed-IP-Address, Framed-IP-Netmask, MS-Primary-DNS-Server, MS-Secondary-DNS-Server

#auth = "certificate"
#auth = "certificate[optional]"
auth = "pam"
#auth = "pam[gid-min=1000]"
#auth = "plain[/etc/ocserv/ocpasswd]"
#auth = "radius[/etc/radiusclient/radiusclient.conf,groupconfig]"

# Whether to enable seccomp/Linux namespaces worker isolation. That restricts the number of 
# system calls allowed to a worker process, in order to reduce damage from a
# bug in the worker process. It is available on Linux systems at a performance cost.
# The performance cost is roughly 2% overhead at transfer time (tested on a Linux 3.17.8).
isolate-workers = true

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

# 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

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

# When the server has a dynamic DNS address (that may change),
# should set that to true to ask the client to resolve again on
# reconnects.
#listen-host-is-dyndns = true

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

# Accept connections using a socket file. It accepts HTTP
# connections (i.e., without SSL/TLS unlike its TCP counterpart),
# and uses it as the primary channel. That option cannot be
# combined with certificate authentication.
#listen-clear-file = /var/run/ocserv-conn.socket

# Stats report time. The number of seconds after which each
# worker process will report its usage statistics (number of
# bytes transferred etc). This is useful when accounting like
# radius is in use.
#stats-report-time = 360

# Keepalive in seconds
keepalive = 32400

# Dead peer detection in seconds.
# Note that when the client is behind a NAT this value
# needs to be short enough to prevent the NAT disassociating
# his UDP session from the port number. Otherwise the client
# could have his UDP connection stalled, for several minutes.
dpd = 90

# Dead peer detection for mobile clients. That needs to
# be higher to prevent such clients being awaken too 
# often by the DPD messages, and save battery.
# The mobile clients are distinguished from the header
# '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)
#
# The server-cert file may contain a single certificate, or
# a sorted certificate chain.
#
# There may be multiple server-cert and server-key directives,
# but each key should correspond to the preceding certificate.
server-cert = /etc/pki/ocserv/public/server.crt
server-key = /etc/pki/ocserv/private/server.key

# 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 = /etc/pki/ocserv/cacerts/ca.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

# The revocation list of the certificates issued by the 'ca-cert' above.
# See the manual to generate an empty CRL initially.
#crl = /path/to/crl.pem

# Uncomment this to enable compression negotiation (LZS, LZ4).
#compression = true

# Set the minimum size under which a packet will not be compressed.
# That is to allow low-latency for VoIP packets. The default size
# is 256 bytes. Modify it if the clients typically use compression
# as well of VoIP with codecs that exceed the default value.
#no-compress-limit = 256

# GnuTLS priority string; note that SSL 3.0 is disabled by default
# as there are no openconnect (and possibly anyconnect clients) using
# that protocol. The string below does not enforce perfect forward
# secrecy, in order to be compatible with legacy clients.
#tls-priorities = "NORMAL:%SERVER_PRECEDENCE:%COMPAT:-RSA:-VERS-SSL3.0"
tls-priorities = "@SYSTEM"

# More combinations in priority strings are available, check
# http://gnutls.org/manual/html_node/Priority-Strings.html
# E.g., the string below enforces perfect forward secrecy (PFS) 
# on the main channel.
#tls-priorities = "NORMAL:%SERVER_PRECEDENCE:%COMPAT:-RSA:-VERS-SSL3.0:-ARCFOUR-128"

# 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 timeout (in seconds)
# Once a client is authenticated he's provided a cookie with
# which he can reconnect. That cookie will be invalided if not
# used within this timeout value. On a user disconnection, that
# cookie will also be active for this time amount prior to be
# invalid. That should allow a reasonable amount of time for roaming
# between different networks.
cookie-timeout = 300

# Whether roaming is allowed, i.e., if true a cookie is
# restricted to a single IP address and cannot be re-used
# from a different IP.
deny-roaming = false

# 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.
# The following 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),
# IPV6_LOCAL (the IPv6 local address if there are both IPv4 and IPv6
# assigned), IPV6_REMOVE (the IPv6 remote address), and
# ID (a unique numeric ID); REASON may be "connect" or "disconnect".

# The disconnect script will receive the additional values: STATS_BYTES_IN,
# STATS_BYTES_OUT, STATS_DURATION that contain a 64-bit counter of the bytes 
# output from the tun device, and the duration of the session in seconds.

#connect-script = /usr/bin/ocserv-script
#disconnect-script = /usr/bin/ocserv-script

# UTMP
# Register the connected clients to utmp. This will allow viewing
# the connected clients using the command 'who'.
use-utmp = true

# 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

# 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 = /var/lib/ocserv

# socket file used for server IPC (worker-main), will be appended with .PID
# It must be accessible within the chroot environment (if any)
socket-file = ocserv.sock

# The user the worker processes will be run as. It should be
# unique (no other services run as this user).
run-as-user = ocserv
run-as-group = ocserv

# 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 to use for the tun device
device = vpns

# Whether the generated IPs will be predictable, i.e., IP stays the
# same for the same user when possible.
predictable-ips = true

# 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

# An alternative way of specifying the network:
#ipv4-network = 192.168.1.0/24

# 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 = fda9:4efe:7e3b:03ea::/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.
# Only set to true, if there can be occupied addresses in the
# IP range for leases.
ping-leases = false

# Use this option to enforce an MTU value to the incoming
# connections. Unset to use the default MTU of the TUN device.
#mtu = 1420

# 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, or use the special keyword
# 'default'.

#route = 192.168.1.0/255.255.255.0
#route = 192.168.5.0/255.255.255.0
#route = fef4:db8:1000:1001::/64

# Groups that a client is allowed to select from.
# A client may belong in multiple groups, and in certain use-cases
# it is needed to switch between them. For these cases the client can
# select prior to authentication. Add multiple entries for multiple groups.
# The group may be followed by a user-friendly name in brackets.
#select-group = group1
#select-group = group2[My special group]

# The name of the (virtual) group that if selected it would assign the user
# to its default group.
#default-select-group = DEFAULT

# Instead of specifying manually all the allowed groups, you may instruct
# ocserv to scan all available groups and include the full list.
#auto-select-group = true

# 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, rx/tx-per-sec, iroute, route,
#  net-priority, deny-roaming, no-udp, user-profile, require-cert, 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). The no-udp
# is a boolean option (e.g., no-udp = true), and will prevent a UDP session
# for that specific user or group.

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

# When config-per-xxx is specified and there is no group or user that
# matches, then utilize the following configuration.
#default-user-config = /etc/ocserv/defaults/user.conf
#default-group-config = /etc/ocserv/defaults/group.conf

# This option is only valid in a user/group configuration file. If the
# auth mode is certificate[optional], it requires a certificate for this
# particular user or group.
#require-cert = true

# 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 (the argument of iroute).

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

# This option allows to forward a proxy. The special keywords '%{U}'
# and '%{G}', if present will be replaced by the username and group name.
#proxy-url = http://example.com/
#proxy-url = http://example.com/%{U}/

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

# This option must be set to true to support legacy CISCO clients.
# A side effect of this option is that it will no longer be required 
# for clients to present their certificate on every connection.
# That is they may resume a cookie without presenting a certificate
# (when certificate authentication is used).
cisco-client-compat = true

# Client profile xml. A sample file exists in doc/profile.xml.
# It is required by some of the CISCO clients.
# This file must be accessible from inside the worker's chroot. 
user-profile = profile.xml

# Binary files that may be downloaded by the CISCO client. Must
# be within any chroot environment. Normally you don't need
# to use this option.
#binary-files = /path/to/binaries

#Advanced options

# Option to allow sending arbitrary custom headers to the client after
# authentication and prior to VPN tunnel establishment. You shouldn't
# need to use this option normally; if you do and you think that
# this may help others, please send your settings and reason to
# the openconnect mailing list. The special keywords '%{U}'
# and '%{G}', if present will be replaced by the username and group name.
#custom-header = "X-My-Header: hi there"