/usr/share/exim4/exim4_refresh_gnutls-params is in exim4-base 4.76-3ubuntu3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | #!/bin/sh
set -e
if [ -n "$EX4DEBUG" ]; then
echo "now debugging $0 $@"
set -x
fi
# regenerate $EXIM4_SPOOLDIR/gnutls-params
# As this can take _very_ long on machines with little entropy, we limit
# the maximum runtime to 2*$CERTTOOLTIMEOUT 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 $EXIM4_SPOOLDIR
PARAMFILE="$EXIM4_SPOOLDIR/gnutls-params"
tempgnutls=$(tempfile --directory $EXIM4_SPOOLDIR --mode 644 --prefix "gnutp" )
if [ -x /usr/bin/certtool ] ; then
# GnuTLS
if /usr/share/exim4/timeout.pl \
"$TIMEOUT" /usr/bin/certtool --generate-dh-params --bits 2048 \
> "$tempgnutls" 2> /dev/null ; then
mv -f "$tempgnutls" "$PARAMFILE"
else
rm -f "$tempgnutls"
fi
elif [ -x /usr/bin/openssl ] ;then
# OpenSSL
if HOME=$EXIM4_SPOOLDIR /usr/share/exim4/timeout.pl \
"$TIMEOUT" /usr/bin/openssl dhparam 2048 \
> "$tempgnutls" 2> /dev/null ; then
mv -f "$tempgnutls" "$PARAMFILE"
else
rm -f "$tempgnutls"
fi
else
# neither GnuTLS nor OpenSSL installed, have exim generate the DH params
rm -f "$PARAMFILE" "$tempgnutls"
fi
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