![]() For OpenVPN v2.4 configurations not wanting this cipher upgrade, the client configuration needs to deploy -ncp-disable. OpenVPN 2.4 based clientswill automatically upgrade to AES-256-GCM, regardless if they have -cipher in their configuration file or not. ![]() The new line will look like this:ĮxecStart=/usr/sbin/openvpn -status %t/openvpn-server/status-%i.log -status-version 2 -suppress-timestamps -cipher AES-256-GCM -ncp-ciphers AES-256-GCM:AES-256-CBC:AES-128-GCM:AES-128-CBC:BF-CBC -config %i.conf The -ncp-ciphers list allows clients to use any of the listed ciphers as well. In today's systemd unit file the following command line is used to start OpenVPN:ĮxecStart=/usr/sbin/openvpn -status %t/openvpn-server/status-%i.log -status-version 2 -suppress-timestamps -config %i.confīy adding -cipher AES-256-GCM -ncp-ciphers AES-256-GCM:AES-256-CBC:AES-128-GCM:AES-128-CBC:BF-CBC before the -config option, the default cipher will be modified. Both recommeds moving away from the default Blowfish cipher (BF/BF-CBC) to a stronger cipher. There have been two independent security audits of OpenVPN recently, performed by QuarksLab SAS and Cryptography Engineering. This proposal will make use of that possibility by modifying the unit file slightly. This proposal changes the default cipher to AES-256-GCM while in parallel allowing clients to connect using AES-256-CBC, AES-128-CBC or the deprecated BF-CBC, ![]() OpenVPN uses Blowfish ( BF-128-CBC) as the default cipher, which is hit by the SWEET32 flaw. Since the discovery of the SWEET32 flaw, ciphers using cipher-blocks smaller than 128-bits are considered vulnerable and should not be used any more. ![]()
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