env/utils/scripts/sshca-keygen.sh

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#!/bin/sh
# env
# Written in 2022 by Lucas
# CC0 1.0 Universal/Public domain - No rights reserved
#
# To the extent possible under law, the author(s) have dedicated all
# copyright and related and neighboring rights to this software to the
# public domain worldwide. This software is distributed without any
# warranty. You should have received a copy of the CC0 Public Domain
# Dedication along with this software. If not, see
# <http://creativecommons.org/publicdomain/zero/1.0/>.
usage()
{
cat - <<EOF >&2
Usage:
${0##*/} [-h] [-n principals] [-V validity_interval]
[-z serial_number] key ...
EOF
exit 1
}
_cleanup()
{
eval $(ssh-agent -ks)
rm -Pfr -- "$T"
}
hflag=
nflag=
Vflag=
zflag=
while getopts hn:V:z: flag; do
case $flag in
h) hflag=-h ;;
n) nflag=$OPTARG ;;
V) Vflag=$OPTARG ;;
z) zflag=$OPTARG ;;
*) usage ;;
esac
done
shift $(($OPTIND - 1))
[ $# -gt 0 ] || usage
T=$(mktemp -d) || exit 1
trap _cleanup EXIT INT QUIT TERM
yyyymmdd=$(date +%Y%m%d)
if [ -n "$hflag" ]; then
cafile=~/.ssh/keys/hostca
outfile=hostca-signed-keys.tgz
else
cafile=~/.ssh/keys/userca
outfile=userca-signed-keys.tgz
fi
id=$(ssh-keygen -lf "$cafile.pub" | cut -d " " -f 3-)
id=${id% (*)}
if [ -z "$id" ]; then
id=${cafile##*/}-$yyyymmdd
fi
eval $(ssh-agent -s)
ssh-add "$cafile"
for arg; do
mkdir -p "$T/$arg"
if [ -n "$hflag" ]; then
f=$T/$arg/ssh_host_ed25519_key
else
f=$T/$arg/id_ed25519
fi
comment=$arg-infra-$yyyymmdd
principals=${nflag:-$arg}
if [ -n "$hflag" ]; then
principals=$principals,localhost
fi
ssh-keygen -q -t ed25519 -C "$comment" -f "$f" ${hflag:+-N ""} &&
ssh-keygen -Us "$cafile.pub" -I "$id" $hflag -n "$principals" \
${Vflag:+-V "$Vflag"} ${zflag:+-z "$zflag"} "$f.pub"
if [ $? -ne 0 ]; then
rm -Pfr -- "$T/$arg"
exit 1
fi
done
(cd "$T" && pax -w .) | gzip >"$outfile"