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#!/bin/sh
#
# nsd-control-setup.sh - set up SSL certificates for nsd-control
#
# Copyright (c) 2011, NLnet Labs. All rights reserved.
#
# This software is open source.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# Neither the name of the NLNET LABS nor the names of its contributors may
# be used to endorse or promote products derived from this software without
# specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
# TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
# settings:
# directory for files
DESTDIR=@configdir@
# issuer and subject name for certificates
SERVERNAME=nsd
CLIENTNAME=nsd-control
# validity period for certificates
DAYS=3650
# size of keys in bits
BITS=3072
# hash algorithm
HASH=sha256
# base name for nsd server keys
SVR_BASE=nsd_server
# base name for nsd-control keys
CTL_BASE=nsd_control
# flag to recreate generated certificates
RECREATE=0
# we want -rw-r--- access (say you run this as root: grp=yes (server), all=no).
umask 0026
# end of options
set -eu
cleanup() {
echo "removing artifacts"
rm -rf \
server.cnf \
client.cnf \
"${SVR_BASE}_trust.pem" \
"${CTL_BASE}_trust.pem" \
"${SVR_BASE}_trust.srl"
}
fatal() {
printf "fatal error: $*\n" >/dev/stderr
exit 1
}
usage() {
cat <<EOF
usage: $0 OPTIONS
OPTIONS
-d <dir> used directory to store keys and certificates (default: $DESTDIR)
-h show help notice
-r recreate certificates
EOF
}
OPTIND=1
while getopts 'd:hr' arg; do
case "$arg" in
d) DESTDIR="$OPTARG" ;;
h) usage; exit 0 ;;
r) RECREATE=1 ;;
?) fatal "'$arg' unknown option" ;;
esac
done
shift $((OPTIND - 1))
echo "setup in directory $DESTDIR"
cd "$DESTDIR"
trap cleanup SIGINT
# ===
# Generate server certificate
# ===
# generate private key; do no recreate it if they already exist.
if [ ! -f "$SVR_BASE.key" ]; then
openssl genrsa -out "$SVR_BASE.key" "$BITS"
fi
cat >server.cnf <<EOF
default_bits=$BITS
default_md=$HASH
prompt=no
distinguished_name=req_distinguished_name
[req_distinguished_name]
commonName=$SERVERNAME
EOF
[ -f server.cnf ] || fatal "cannot create openssl configuration"
if [ ! -f "$SVR_BASE.pem" -o $RECREATE -eq 1 ]; then
openssl req \
-new -x509 \
-key "$SVR_BASE.key" \
-config server.cnf \
-days "$DAYS" \
-out "$SVR_BASE.pem"
[ ! -f "SVR_BASE.pem" ] || fatal "cannot create server certificate"
fi
# ===
# Generate client certificate
# ===
# generate private key; do no recreate it if they already exist.
if [ ! -f "$CTL_BASE.key" ]; then
openssl genrsa -out "$CTL_BASE.key" "$BITS"
fi
cat >client.cnf <<EOF
[req]
default_bits=$BITS
default_md=$HASH
prompt=no
distinguished_name=req_distinguished_name
[req_distinguished_name]
commonName=$CLIENTNAME
EOF
[ -f client.cnf ] || fatal "cannot create openssl configuration"
if [ ! -f "$CTL_BASE.pem" -o $RECREATE -eq 1 ]; then
openssl x509 \
-addtrust serverAuth \
-in "$SVR_BASE.pem" \
-out "${SVR_BASE}_trust.pem"
openssl req \
-new \
-config client.cnf \
-key "$CTL_BASE.key" \
| openssl x509 \
-req \
-days "$DAYS" \
-CA "${SVR_BASE}_trust.pem" \
-CAkey "$SVR_BASE.key" \
-CAcreateserial \
-$HASH \
-out "$CTL_BASE.pem"
[ ! -f "CTL_BASE.pem" ] || fatal "cannot create signed client certificate"
fi
# remove unused permissions
chmod o-rw \
"$SVR_BASE.pem" \
"$SVR_BASE.key" \
"$CTL_BASE.pem" \
"$CTL_BASE.key"
cleanup
echo "Setup success. Certificates created. Enable in nsd.conf file to use"
# create trusted usage pem
# openssl x509 -in $CTL_BASE.pem -addtrust clientAuth -out $CTL_BASE"_trust.pem"
# see details with openssl x509 -noout -text < $SVR_BASE.pem
# echo "create $CTL_BASE""_browser.pfx (web client certificate)"
# echo "create webbrowser PKCS#12 .PFX certificate file. In Firefox import in:"
# echo "preferences - advanced - encryption - view certificates - your certs"
# echo "empty password is used, simply click OK on the password dialog box."
# openssl pkcs12 -export -in $CTL_BASE"_trust.pem" -inkey $CTL_BASE.key -name "nsd remote control client cert" -out $CTL_BASE"_browser.pfx" -password "pass:" || error "could not create browser certificate"
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