/
cert-enroll.in
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cert-enroll.in
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#!/bin/bash
# Enroll or re-enroll X.509 certificates via EST or SCEP protocols using
# the strongSwan pki tool. Install the certificates via the install scripts
#
# Copyright (C) 2023 Andreas Steffen
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
set -e
##############################################################################
# Set default configuration and installation scripts
#
CONFIG_DIR="@SYSCONFDIR@/cert-enroll.d"
CONFIG_SCRIPT="$CONFIG_DIR/cert-enroll.conf"
CONFIG_SCRIPT_LOCAL="$CONFIG_DIR/cert-enroll.conf.local"
INSTALL_SCRIPT_DIR="$CONFIG_DIR/cert-install.d"
##############################################################################
# Parse optional arguments
#
function help()
{
echo "Usage:"
echo "cert-enroll [-c filename] [-i directory]"
echo "Options:"
echo " -h print usage information"
echo " -c local configuration file, defaults to $CONFIG_SCRIPT_LOCAL"
echo " -i installation script directory, defaults to $INSTALL_SCRIPT_DIR"
}
while getopts "c:i:h" opt
do
case "$opt" in
c)
CONFIG_SCRIPT_LOCAL=${OPTARG}
;;
i)
INSTALL_SCRIPT_DIR=${OPTARG}
;;
h)
help; exit 0
;;
esac
done
##############################################################################
# Set optional local configuration parameters, overwriting default parameters
#
if [ -f $CONFIG_SCRIPT_LOCAL ]
then
. $CONFIG_SCRIPT_LOCAL
fi
##############################################################################
# Set default configuration parameters
#
if [ -f $CONFIG_SCRIPT ]
then
. $CONFIG_SCRIPT
elif [ -f $CONFIG_SCRIPT_LOCAL ]
then
echo "Warning: default configuration file '$CONFIG_SCRIPT' not found," \
"depending on local configuration '$CONFIG_SCRIPT_LOCAL' only"
else
echo "Error: neither '$CONFIG_SCRIPT' nor '$CONFIG_SCRIPT_LOCAL'" \
"configuration files found"
exit 1
fi
# Path to the strongSwan pki command
PKI="@BINDIR@/pki"
##############################################################################
# Define some local functions
#
function gen_private_key()
{
status=0
$PKI --gen --type $key_type --size $size --outform pem > "$1" || status=$?
if [ $status -ne 0 -o ! -s $1 ]
then
echo "Error: generation of $size bit $KEYTYPE private key failed"
exit 1
fi
chmod 600 $1
echo " generated $size bit $KEYTYPE private key '$1'"
}
function gen_cert_request()
{
status=0
$PKI --req --in "$1/$HOSTKEY" --type $in_type --dn "$DN" \
$SAN "${ADD_SANS[@]}" \
--profile $PROFILE --outform pem > "$1/$CERTREQ" || status=$?
if [ $status -ne 0 -o ! -s $1 ]
then
echo "Error: generation of PKCS#10 certificate request failed"
exit 1
fi
chmod 600 $1
echo " generated PKCS#10 certificate request"
}
function get_ca_certs()
{
cd $1
status=0
if [ $CA_PROTOCOL == "EST" ]
then
$PKI --estca --url $EST_URL --cacert $TLSROOTCA --caout $CAOUT \
--outform pem --force || status=$?
if [ $status -ne 0 -o ! -s $ROOTCA -o ! -s $SUBCA ]
then
echo "Error: download of CA certificates via EST failed"
exit 1
fi
echo " downloaded CA certificates via EST"
else
$PKI --scepca --url $SCEP_URL --caout $CAOUT --raout $RAOUT \
--outform pem --force || status=$?
if [ $status -ne 0 -o ! -s $ROOTCA -o ! -s $SUBCA -o ! -s $RACERT ]
then
echo "Error: download of CA or RA certificates via SCEP failed"
exit 1
fi
echo " downloaded CA and RA certificates via SCEP"
fi
cd $CERTDIR
}
function check_ca_certs()
{
get_ca_certs "$CERTDIR/new"
ROOTCA_CHANGED=0
cmp -s $ROOTCA new/$ROOTCA || ROOTCA_CHANGED=$?
if [ $ROOTCA_CHANGED -ne 0 ]
then
echo "Warning: '$ROOTCA' has changed"
mv $ROOTCA old
mv new/$ROOTCA .
fi
SUBCA_CHANGED=0
cmp -s $SUBCA new/$SUBCA || SUBCA_CHANGE=$?
if [ $SUBCA_CHANGED -ne 0 ]
then
echo "Warning: '$SUBCA' has changed"
mv $SUBCA old
mv new/$SUBCA .
fi
if [ $CA_PROTOCOL == "SCEP" ]
then
mv new/$RACERT .
fi
if [ $ROOTCA_CHANGED -eq 0 -a $SUBCA_CHANGED -eq 0 ]
then
echo "Ok: '$ROOTCA' and '$SUBCA' are unchanged"
rm new/$ROOTCA new/$SUBCA
return 0
else
return 1
fi
}
function install_certs()
{
for script in $INSTALL_SCRIPT_DIR/*
do
status=0
echo " executing '$script'"
KEYTYPE="$KEYTYPE" CERTDIR="$CERTDIR" HOSTKEY="$HOSTKEY" \
HOSTCERT="$HOSTCERT" ROOTCA="$ROOTCA" SUBCA="$SUBCA" \
OLDROOTCA="$OLDROOTCA" OLDSUBCA="$OLDSUBCA" \
USER_GROUP="$USER_GROUP" SERVICE="$SERVICE" \
/bin/bash $script || status=$?
if [ $status -ne 0 ]
then
echo "Error: executing '$script' failed"
fi
done
}
##############################################################################
# SCEP certificate enrollment protocol requires RSA
#
if [ $PROTOCOL == "SCEP" -a $KEYTYPE != "RSA" ]
then
echo "Warning: the SCEP protocol does not support $KEYTYPE keys," \
"switched to RSA key"
KEYTYPE="RSA"
fi
##############################################################################
# Select key size
#
case $KEYTYPE in
RSA)
key_type="rsa"
in_type="rsa"
size=$RSA_SIZE
;;
ECDSA)
key_type="ecdsa"
in_type="ecdsa"
size=$ECDSA_SIZE
;;
ED25519)
key_type="ed25519"
in_type="priv"
size="256"
;;
ED448)
key_type="ed448"
in_type="priv"
size="456"
;;
*)
echo "Error: $KEYTYPE key type unknown"
exit 1
;;
esac
##############################################################################
# Create and change into certificates directory
#
mkdir -p $CERTDIR/new $CERTDIR/old
cd $CERTDIR
echo " changed into the '$CERTDIR' directory"
#############################################################################
# Fetch the CA certificates with the selected enrollment protocol if possible
#
if [ $CA_PROTOCOL == "EST" -a ! -s $TLSROOTCA ]
then
echo " no TLS root CA certificate for EST available," \
"revert to SCEP CA protocol"
CA_PROTOCOL="SCEP"
fi
##############################################################################
# Check if non-empty certificate already exists
#
if [ -s $HOSTCERT ]
then
##############################################################################
# Determine the remaining validity of the certificate in days
#
DAYS=$($PKI --print --in $HOSTCERT | awk '/not after/ {
if (($7 == "ok") && ($11 == "days)")) {
print $10
} else {
printf("0")
}
}' -)
if [ $DAYS -ge $MIN_DAYS ]
then
echo "Ok: validity of '$HOSTCERT' is $DAYS days," \
"more than the minimum of $MIN_DAYS days"
if [ $(expr $DAYS % $CA_CHECK_INTERVAL) -eq 0 ]
then
check_ca_certs && exit 0
# update CA certificates if any of them changed
install_certs
fi
exit 0
fi
echo "Warning: validity of '$HOSTCERT' is only $DAYS days," \
"less than the minimum of $MIN_DAYS days"
##############################################################################
# Check if non-empty private key already exists
#
if [ -s "new/$HOSTKEY" ]
then
echo "Warning: 'new/$HOSTKEY' already exists," \
"resuming $PROTOCOL re-enrollment"
else
##############################################################################
# Generate new private key
#
gen_private_key "new/$HOSTKEY"
fi
##############################################################################
# Get and check CA and RA certificates via SCEP or EST
#
check_ca_certs
##############################################################################
# Re-enroll certificate via SCEP or EST
#
status=0
if [ $PROTOCOL == "SCEP" ]
then
$PKI --scep --url $SCEP_URL --in new/$HOSTKEY --key $HOSTKEY \
--cert $HOSTCERT --dn "$DN" $SAN "${ADD_SANS[@]}" \
--cacert-sig $SUBCA --cacert-enc $RACERT --cacert $ROOTCA \
--maxpolltime $SCEP_MAX_POLL_TIME --profile $PROFILE \
--outform pem > new/$HOSTCERT || status=$?
else
gen_cert_request "$CERTDIR/new"
$PKI --est --url $EST_URL --in new/$CERTREQ --cacert $ROOTCA \
--cacert $SUBCA --cacert $TLSROOTCA --key $HOSTKEY \
--cert $HOSTCERT --maxpolltime $EST_MAX_POLL_TIME \
--outform pem > new/$HOSTCERT || status=$?
fi
if [ $status -ne 0 -o ! -s $HOSTCERT ]
then
echo "Error: re-enrollment via $PROTOCOL failed"
exit 1
fi
echo "Ok: successfully re-enrolled '$HOSTCERT' via $PROTOCOL"
##############################################################################
# Replace old key and certificate
#
mv $HOSTKEY $HOSTCERT old
mv new/$HOSTKEY new/$HOSTCERT .
if [ $PROTOCOL == "EST" ]
then
mv $CERTREQ old
mv new/$CERTREQ .
fi
echo " replaced old '$HOSTKEY' and '$HOSTCERT'"
##############################################################################
# Install keys and certificates
#
install_certs
exit 0
else
##############################################################################
# No certificate exists yet
#
echo " '$HOSTCERT' doesn't exist yet"
##############################################################################
# Check if non-empty private key already exists
#
if [ -s "$HOSTKEY" ]
then
echo "Warning: '$HOSTKEY' already exists, resuming $PROTOCOL enrollment"
else
##############################################################################
# Generate private key
#
gen_private_key "$HOSTKEY"
fi
##############################################################################
# Get CA and RA certificates via SCEP
#
get_ca_certs "$CERTDIR"
##############################################################################
# Enroll certificate via SCEP or EST
#
status=0
if [ $PROTOCOL == "SCEP" ]
then
$PKI --scep --url $SCEP_URL --in $HOSTKEY --dn "$DN" $SAN "${ADD_SANS[@]}" \
--cacert-sig $SUBCA --cacert-enc $RACERT --cacert $ROOTCA \
--profile $PROFILE --maxpolltime $SCEP_MAX_POLL_TIME \
--outform pem > $HOSTCERT || status=$?
else
gen_cert_request "$CERTDIR"
$PKI --est --url $EST_URL --in $CERTREQ \
--cacert $ROOTCA --cacert $SUBCA --cacert $TLSROOTCA \
--maxpolltime $EST_MAX_POLL_TIME \
--outform pem > $HOSTCERT || status=$?
fi
if [ $status -ne 0 -o ! -s $HOSTCERT ]
then
echo "Error: enrollment via $PROTOCOL failed"
exit 1
fi
echo "Ok: successfully enrolled '$HOSTCERT' via $PROTOCOL"
##############################################################################
# Install keys and certificates
#
install_certs
exit 0
fi