From: Ian Kelling <ian@iankelling.org>
Date: Tue, 21 Feb 2017 08:48:41 +0000 (-0800)
Subject: mostly avoid momentary disconnections
X-Git-Url: https://iankelling.org/git/?a=commitdiff_plain;h=45b747be876918d04c2013b9ba519a2770b61cd0;p=vpn-setup

mostly avoid momentary disconnections
---

diff --git a/vpn-mk-client-cert b/vpn-mk-client-cert
index 4e41bac..bd946dd 100755
--- a/vpn-mk-client-cert
+++ b/vpn-mk-client-cert
@@ -105,4 +105,8 @@ remote-cert-tls server
 
 # more resilient when running as nonroot
 persist-key
+
+# see comments in server side configuration.
+# the minimum of the 2 is used.
+reneg-sec 2592000
 EOF
diff --git a/vpn-server-setup b/vpn-server-setup
index c901970..dec98e9 100755
--- a/vpn-server-setup
+++ b/vpn-server-setup
@@ -79,6 +79,18 @@ cat >>/etc/openvpn/server.conf <<'EOF'
 cipher aes-256-cbc
 # just sets up the ability to have client specific configs
 client-config-dir /etc/openvpn/client-config
+# 30 days. default is 3600, 1 hour. we momentarily disconnect
+# after this time, and get a new tls key. The idea is that
+# if someone is working very hard to break our encryption,
+# they have less time to do it, and less time in the past
+# for it to be broken. online sources say that there is no
+# good objective idea about what a good value is here, since
+# we don't expect our encryption to be breakable, but 1 hour
+# seems very conservative. Since I want to support hosting
+# a server over the tunnel, having the server break up to once
+# an hour is very tough. I've seen a vpn service that seems
+# very on top of things set this to 5 days.
+reneg-sec 2592000
 EOF
 mkdir -p /etc/openvpn/client-config