If you are using OpenVPN and need a windows client then there is a nice client at https://openvpn.net/client-connect-vpn-for-windows/
However it is difficult to use the normal sample client.conf provided with OpenVPN and it's better to have a client.ovpn file with the certificates all embedded
Easy RSA instructions for version 3
These are good easy to follow instructions: https://www.golinuxcloud.com/install-openvpn-server-easy-rsa-3-centos-7/
Sample client configuration files
Save these as a .ovpn
Client connecting to a server with username / password auth enabled
client
dev tun
proto udp
# remote server hostname or IP
remote remote.example.com 1194
resolv-retry infinite
nobind
ns-cert-type server
persist-key
persist-tun
# another example had these
# lines but OpenVPN Connect chokes
# on the [inline] option
;ca [inline]
;cert [inline]
;key [inline]
verb 3
keepalive 10 900
inactive 3600
comp-lzo
# if you have pam auth and don't have
# auth-user-pass-optional then you need
# to specify this to have the client
# prompt for user name and password
# this is for servers that both auth with cert
# username / password
auth-user-pass
<ca>
-----BEGIN CERTIFICATE-----
... 22 lines snipped
-----END CERTIFICATE-----
</ca>
<cert>
Certificate:
Data:
Version: 3 (0x2)
Serial Number: 8 (0x8)
Signature Algorithm: sha1WithRSAEncryption
Issuer: C=AU, ST=NSW, L=Ringwood East, O=TGN-Ringwood East, OU=NSW, CN=remote.example.com/name=James McDonald/[email protected]
Validity
Not Before: May 4 13:35:33 2020 GMT
Not After : May 2 13:35:33 2030 GMT
Subject: C=AU, ST=NSW, L=Ringwood East, O=TGN, OU=Toggen, CN=tgn-lt01/name=James McDonald/[email protected]
Subject Public Key Info:
Public Key Algorithm: rsaEncryption
Public-Key: (1024 bit)
Modulus:
... 9 lines snipped
Exponent: 65537 (0x10001)
X509v3 extensions:
X509v3 Basic Constraints:
CA:FALSE
Netscape Comment:
Easy-RSA Generated Certificate
X509v3 Subject Key Identifier:
...snippped
X509v3 Authority Key Identifier:
keyid: ... snipped
DirName:/C=AU/ST=NSW/L=Ringwood East/O=TGN-Ringwood East/OU=NSW/CN=remote.example.com/name=James McDonald/[email protected]
serial: ... snipped
X509v3 Extended Key Usage:
TLS Web Client Authentication
X509v3 Key Usage:
Digital Signature
Signature Algorithm: sha1WithRSAEncryption
... 8 lines snipped
-----BEGIN CERTIFICATE-----
... 23 lines snipped
-----END CERTIFICATE-----
</cert>
<key>
-----BEGIN PRIVATE KEY-----
... 14 lines snipped
-----END PRIVATE KEY-----
</key>
Client connecting with tls-auth
##############################################
# Sample client-side OpenVPN 2.0 config file #
# for connecting to multi-client server. #
# #
# This configuration can be used by multiple #
# clients, however each client should have #
# its own cert and key files. #
# #
# On Windows, you might want to rename this #
# file so it has a .ovpn extension #
##############################################
# Specify that we are a client and that we
# will be pulling certain config file directives
# from the server.
client
# Use the same setting as you are using on
# the server.
# On most systems, the VPN will not function
# unless you partially or fully disable
# the firewall for the TUN/TAP interface.
;dev tap
dev tun
# Windows needs the TAP-Win32 adapter name
# from the Network Connections panel
# if you have more than one. On XP SP2,
# you may need to disable the firewall
# for the TAP adapter.
;dev-node MyTap
# Are we connecting to a TCP or
# UDP server? Use the same setting as
# on the server.
;proto tcp
proto udp
# The hostname/IP and port of the server.
# You can have multiple remote entries
# to load balance between the servers.
remote remote.example.com 1194
;remote my-server-2 1194
# Choose a random host from the remote
# list for load-balancing. Otherwise
# try hosts in the order specified.
;remote-random
# Keep trying indefinitely to resolve the
# host name of the OpenVPN server. Very useful
# on machines which are not permanently connected
# to the internet such as laptops.
resolv-retry infinite
# Most clients don't need to bind to
# a specific local port number.
nobind
# Downgrade privileges after initialization (non-Windows only)
;user nobody
;group nobody
# Try to preserve some state across restarts.
persist-key
persist-tun
# If you are connecting through an
# HTTP proxy to reach the actual OpenVPN
# server, put the proxy server/IP and
# port number here. See the man page
# if your proxy server requires
# authentication.
;http-proxy-retry # retry on connection failures
;http-proxy [proxy server] [proxy port #]
# Wireless networks often produce a lot
# of duplicate packets. Set this flag
# to silence duplicate packet warnings.
;mute-replay-warnings
# SSL/TLS parms.
# See the server config file for more
# description. It's best to use
# a separate .crt/.key file pair
# for each client. A single ca
# file can be used for all clients.
# ca ca.crt
<ca>
-----BEGIN CERTIFICATE-----
... 18 lines snipped
-----END CERTIFICATE-----
</ca>
# cert client.crt
<cert>
Certificate:
Data:
Version: 3 (0x2)
Serial Number:
2e:81:27:87:8d:af:ce:70:d0:5d:12:03:bf:88:ff:cf
Signature Algorithm: sha256WithRSAEncryption
Issuer: CN=Easy-RSA CA
Validity
Not Before: May 5 02:32:36 2020 GMT
Not After : Aug 8 02:32:36 2022 GMT
Subject: CN=tgn-lt01
Subject Public Key Info:
Public Key Algorithm: rsaEncryption
Public-Key: (2048 bit)
Modulus:
... snipped
Exponent: 65537 (0x10001)
X509v3 extensions:
X509v3 Basic Constraints:
CA:FALSE
X509v3 Subject Key Identifier:
... snipped
X509v3 Authority Key Identifier:
keyid: ...snipped
DirName:/CN=Easy-RSA CA
serial:...snipped
X509v3 Extended Key Usage:
TLS Web Client Authentication
X509v3 Key Usage:
Digital Signature
Signature Algorithm: sha256WithRSAEncryption
... 15 lines snipped
-----BEGIN CERTIFICATE-----
... 18 lines snipped
-----END CERTIFICATE-----
</cert>
# key client.key
<key>
-----BEGIN PRIVATE KEY-----
... 26 lines snipped
-----END PRIVATE KEY-----
</key>
# Verify server certificate by checking that the
# certicate has the correct key usage set.
# This is an important precaution to protect against
# a potential attack discussed here:
# http://openvpn.net/howto.html#mitm
#
# To use this feature, you will need to generate
# your server certificates with the keyUsage set to
# digitalSignature, keyEncipherment
# and the extendedKeyUsage to
# serverAuth
# EasyRSA can do this for you.
remote-cert-tls server
key-direction 1
# If a tls-auth key is used on the server
# then every client must also have the key.
#tls-auth ta.key 1
<tls-auth>
#
# 2048 bit OpenVPN static key
#
-----BEGIN OpenVPN Static key V1-----
... 16 lines snipped
-----END OpenVPN Static key V1-----
</tls-auth>
# Select a cryptographic cipher.
# If the cipher option is used on the server
# then you must also specify it here.
# Note that v2.4 client/server will automatically
# negotiate AES-256-GCM in TLS mode.
# See also the ncp-cipher option in the manpage
cipher AES-256-CBC
# Enable compression on the VPN link.
# Don't enable this unless it is also
# enabled in the server config file.
#comp-lzo
# Set log file verbosity.
verb 3
# Silence repeating messages
;mute 20
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