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From: David Sommerseth <dazo@eurephia.org>
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Subject: [PATCH] Change the default cipher to AES-256-GCM for server
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configurations
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This change makes the server use AES-256-GCM instead of BF-CBC as the default
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cipher for the VPN tunnel. To avoid breaking existing running configurations
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defaulting to BF-CBC, the Negotiable Crypto Parameters (NCP) list contains
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the BF-CBC in addition to AES-CBC. This makes it possible to migrate
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existing older client configurations one-by-one to use at least AES-CBC unless
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the client is updated to v2.4 (which defaults to upgrade to AES-GCM automatically)
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[Update 2022-06-10]
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The BF-CBC reference is now removed as of Fedora 36 and newer. The Blowfish
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cipher is no longer available by default in OpenSSL 3.0. It can be enabled
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via the legacy provider in OpenSSL 3.0, but BF-CBC is deprecated and should
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not be used any more. OpenVPN 2.4 and newer will always negotiate a stronger
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cipher by default and older OpenVPN releases are no longer supported upstream.
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---
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distro/systemd/openvpn-server@.service.in | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/distro/systemd/openvpn-server@.service.in b/distro/systemd/openvpn-server@.service.in
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index 9a8a2c7..0ecda08 100644
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--- a/distro/systemd/openvpn-server@.service.in
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+++ b/distro/systemd/openvpn-server@.service.in
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@@ -10,7 +10,7 @@ Documentation=https://community.openvpn.net/openvpn/wiki/HOWTO
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Type=notify
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PrivateTmp=true
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WorkingDirectory=/etc/openvpn/server
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-ExecStart=@sbindir@/openvpn --status %t/openvpn-server/status-%i.log --status-version 2 --suppress-timestamps --config %i.conf
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+ExecStart=@sbindir@/openvpn --status %t/openvpn-server/status-%i.log --status-version 2 --suppress-timestamps --cipher AES-256-GCM --data-ciphers AES-256-GCM:AES-128-GCM:AES-256-CBC:AES-128-CBC --config %i.conf
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CapabilityBoundingSet=CAP_IPC_LOCK CAP_NET_ADMIN CAP_NET_BIND_SERVICE CAP_NET_RAW CAP_SETGID CAP_SETUID CAP_SYS_CHROOT CAP_DAC_OVERRIDE CAP_AUDIT_WRITE
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LimitNPROC=10
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DeviceAllow=/dev/null rw
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--
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2.11.0
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