tigervnc/with-vnc-key.sh

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#!/bin/bash
# Wrapper that makes sure /etc/vnc/tls.{key,cert} exist before executing given command.
TLSKEY=/etc/vnc/tls.key
TLSCERT=/etc/vnc/tls.cert
if test -s $TLSKEY -a -s $TLSCERT; then
# Execute the command we were given.
exec "$@"
fi
(
# Wait for lock on the key file. We must not proceed while someone else is creating it.
flock 200
# If the key file doesn't exist or has zero size (because it doubles as lock), generate it.
if ! test -s $TLSKEY ; then
(umask 077 && openssl genrsa -out $TLSKEY 2048) >&200
chown vnc:vnc $TLSKEY
fi
# If the cert file doesn't exist, generate it.
if ! test -e $TLSCERT ; then
CN="Automatically generated certificate for the VNC service"
openssl req -new -x509 -extensions usr_cert -key $TLSKEY -out $TLSCERT -days 7305 -subj "/CN=$CN/"
chown vnc:vnc $TLSCERT
fi
) 200>>$TLSKEY 2>/dev/null
# Execute the command we were given.
exec "$@"