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#!/bin/sh
#
# see:
# https://www.howtoforge.com/tutorial/strongswan-based-ipsec-vpn-using-certificates-and-pre-shared-key-on-ubuntu-16-04/
#
PROG=$(basename "$0")
[ -z "$EUID" ] && EUID=$(id -u)
if [ $# -lt 5 ]; then
echo "Usage: $PROG { -s | -c | -u } country domain organization identities [ ... ]" >&2
exit 1
fi
case "$1" in
-s)
S_OPT=1 ;;
-c)
C_OPT=1 ;;
-u)
U_OPT=1 ;;
*)
echo "$PROG: require an option specifying server/client/user credential type" >&2
exit 1
;;
esac
shift
C="$1"; shift
DOMAIN="$1"; shift
SHORT_DOMAIN="${DOMAIN%%.*}"
ORG="$1"; shift
# invariants...
SYSCONFDIR=/etc
SWANCTL_DIR="$SYSCONFDIR/swanctl"
: ${KEYINFO:="rsa:4096"}
: ${CADAYS:=3650}
: ${CRTDAYS:=730}
makeDN()
{
printf "C=%s, O=%s, CN=%s" "$1" "$2" "$3"
}
field()
{
local arg="$1"
local nth="$2"
echo "$arg" | cut -d ':' -f "$nth"
}
genmasterkey()
{
local keytype keybits
keytype=$(field "$KEYINFO" 1)
keybits=$(field "$KEYINFO" 2)
pki --gen --type "$keytype" --size "$keybits" --outform pem > "$SWANCTL_DIR/private/$SHORT_DOMAIN.key"
chmod 0400 "$SWANCTL_DIR/private/$SHORT_DOMAIN.key"
}
genca()
{
local keytype
keytype=$(field "$KEYINFO" 1)
pki --self --ca --lifetime "$CADAYS" --in "$SWANCTL_DIR/private/$SHORT_DOMAIN.key" --type "$keytype" \
--dn "$ROOTDN" --outform pem > "$SWANCTL_DIR/x509ca/$SHORT_DOMAIN.crt"
chmod 0444 "$SWANCTL_DIR/x509ca/$SHORT_DOMAIN.crt"
}
genclientkey()
{
local name="$1" keytype keybits
keytype=$(field "$KEYINFO" 1)
keybits=$(field "$KEYINFO" 2)
pki --gen --type "$keytype" --size "$keybits" --outform pem > "$SWANCTL_DIR/private/$name.key"
chmod 0400 "$SWANCTL_DIR/private/$name.key"
}
gendevcert()
{
local dn="$1"
local san="$2"
local name="$3"
# reads key from input
pki --issue --lifetime "$CRTDAYS" \
--cacert "$SWANCTL_DIR/x509ca/$SHORT_DOMAIN.crt" \
--cakey "$SWANCTL_DIR/private/$SHORT_DOMAIN.key" \
--dn "$dn" --san "$san" \
${S_OPT:+--flag serverAuth} \
${S_OPT:---flag clientAuth} \
--flag ikeIntermediate \
--outform pem > "$SWANCTL_DIR/x509/$name.crt"
chmod 0444 "$SWANCTL_DIR/x509/$name.crt"
}
gendev()
{
local keytype
keytype=$(field "$KEYINFO" 1)
[ -f "$SWANCTL_DIR/private/$NAME.key" ] || genclientkey "$NAME"
[ -f "$SWANCTL_DIR/x509/$NAME.crt" ] || \
pki --pub --in "$SWANCTL_DIR/private/$NAME.key" --type "$keytype" \
| gendevcert "$DEVDN" "$DEVSAN" "$NAME"
}
setparams()
{
NAME="$1"
if [ -n "$U_OPT" ]; then
DEVSAN="$NAME@$DOMAIN"
DEVDN="$(makeDN "$C" "$ORG" "$DEVSAN")"
else
DEVSAN="$NAME.$DOMAIN"
DEVDN="$(makeDN "$C" "$ORG" "$NAME")"
fi
}
umask 077
[ "$EUID" -eq 0 ] || { echo "Must run as root!" >&2 ; exit 1; }
ROOTDN="$(makeDN "$C" "$ORG" "Root CA")"
[ -f "$SWANCTL_DIR/private/$SHORT_DOMAIN.key" ] || genmasterkey
[ -f "$SWANCTL_DIR/x509ca/$SHORT_DOMAIN.crt" ] || genca
PARENT="$SYSCONFDIR"
BASEDIR="${SWANCTL_DIR##$PARENT/}"
for name in "$@"; do
setparams "$name"
gendev
tar -zcf "$name-certs.tar.gz" -C "$PARENT" "$BASEDIR/x509ca/$SHORT_DOMAIN.crt" "$BASEDIR/x509/$name.crt" "$BASEDIR/private/$name.key"
chmod 600 "$name-certs.tar.gz"
echo "Generated as $name-certs.tar.gz"
done
exit 0
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