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#!/bin/sh
set -e
if [ -n "$EX4DEBUG" ]; then
echo "now debugging $0 $@"
set -x
fi
# regenerate $EXIM4_SPOOLDIR/gnutls-params-*
# As this can take _very_ long on machines with little entropy, we limit
# the maximum runtime to 1800 seconds and keep using the
# old file otherwise.
# Only do anything if exim4 is actually installed
if [ ! -x /usr/lib/exim4/exim4 ]; then
exit 0
fi
# Only do anyting if TLS is enabled in exim
if [ -z "$(/usr/lib/exim4/exim4 -bP tls_advertise_hosts | sed 's/.*=[[:space:]]\(.*\)/\1/')" ]; then
# TLS disabled
exit 0
fi
TIMEOUT=${1:-1800}
EXIM4_SPOOLDIR="${EXIM4_SPOOLDIR:-$(/usr/lib/exim4/exim4 -bP spool_directory | sed 's/.*=[[:space:]]\(.*\)/\1/')}"
cd $EXIM4_SPOOLDIR
# loop over gnutls-params-files
for paramfile in `find -maxdepth 1 -regex '\./gnutls-params-[0-9][0-9][0-9]*'` ; do
bits=`echo ${paramfile} | sed -e 's:\./gnutls-params-::'`
tempgnutls=$(tempfile --directory $EXIM4_SPOOLDIR --mode 644 --prefix "gnutp" )
if [ -x /usr/bin/certtool ] ; then
# GnuTLS
if timeout --preserve-status --kill-after=15 \
"$TIMEOUT" /usr/bin/certtool --generate-dh-params --bits ${bits} \
> "$tempgnutls" 2> /dev/null ; then
cat "$tempgnutls" > "${paramfile}" ; rm -f "$tempgnutls"
else
rm -f "$tempgnutls"
break
fi
else
# gnutls-bin not installed, let exim generate the DH params
rm -f "${paramfile}" "$tempgnutls"
fi
done
# vim:tabstop=2:expandtab:shiftwidth=2
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