Add scripts for helping managing a SSH CA
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#!/bin/sh
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# env
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# Written in 2022 by Lucas
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# CC0 1.0 Universal/Public domain - No rights reserved
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#
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# To the extent possible under law, the author(s) have dedicated all
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# copyright and related and neighboring rights to this software to the
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# public domain worldwide. This software is distributed without any
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# warranty. You should have received a copy of the CC0 Public Domain
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# Dedication along with this software. If not, see
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# <http://creativecommons.org/publicdomain/zero/1.0/>.
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usage()
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{
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printf "Usage: %s [-c] [-l login_name] host ...\n" "${0##*/}" >&2
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exit 1
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}
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err()
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{
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printf "%s: %s\n" "${0##*/}" "$*" >&2
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exit 1
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}
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login_name=$(id -nu)
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agent_mode=yes
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while getopts cl: flag; do
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case $flag in
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c) agent_mode=confirm ;;
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l) login_name=$OPTARG ;;
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*) usage
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esac
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done
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shift $(($OPTIND - 1))
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[ $# -gt 0 ] || usage
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if [ -z "$SSH_AUTH_SOCK" ] || [ ! -S "$SSH_AUTH_SOCK" ]; then
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eval $(ssh-agent -s)
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trap 'eval $(ssh-agent -ks)' EXIT INT QUIT TERM
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fi
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set -e
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for host; do
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[ -d "$host" ] || err "no host keys for $host"
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# Load correct key into ssh-agent.
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ssh -o AddKeysToAgent=$agent_mode "$login_name@$host" true
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tmpdir=$(ssh "$login_name@$host" mktemp -dt hostkeys.XXXXXX)
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sftp "$login_name@$host" <<EOF
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put $host/* $tmpdir/
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EOF
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ssh "$login_name@$host" "cat - >\"$tmpdir/install-hostkeys.sh\"" <<EOF
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cd "$tmpdir" && for type in ecdsa ed25519 rsa; do
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sk=ssh_host_\${type}_key
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pk=\$sk.pub
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cert=\$sk-cert.pub
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[ -s "\$sk" ] || continue
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doas install -m 600 -o root -g wheel "\$sk" /etc/ssh/
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doas install -m 644 -o root -g wheel "\$pk" /etc/ssh/
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if [ -s "\$cert" ]; then
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doas install -m 644 -o root -g wheel "\$cert" /etc/ssh/
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fi
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doas rcctl reload sshd
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rm -Pf -- "\$sk" "\$pk" "\$cert"
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done
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EOF
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# -t is needed for doas to read a password.
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ssh -t "$login_name@$host" sh "$tmpdir/install-hostkeys.sh"
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sftp "$login_name@$host" <<EOF
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rm $tmpdir/*
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rmdir $tmpdir/
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EOF
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done
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@ -0,0 +1,89 @@
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#!/bin/sh
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# env
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# Written in 2022 by Lucas
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# CC0 1.0 Universal/Public domain - No rights reserved
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#
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# To the extent possible under law, the author(s) have dedicated all
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# copyright and related and neighboring rights to this software to the
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# public domain worldwide. This software is distributed without any
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# warranty. You should have received a copy of the CC0 Public Domain
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# Dedication along with this software. If not, see
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# <http://creativecommons.org/publicdomain/zero/1.0/>.
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usage()
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{
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cat - <<EOF >&2
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Usage:
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${0##*/} [-h] [-n principals] [-V validity_interval]
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[-z serial_number] key ...
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EOF
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exit 1
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}
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_cleanup()
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{
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eval $(ssh-agent -ks)
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rm -Pfr -- "$T"
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}
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hflag=
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nflag=
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Vflag=
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zflag=
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while getopts hn:V:z: flag; do
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case $flag in
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h) hflag=-h ;;
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n) nflag=$OPTARG ;;
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V) Vflag=$OPTARG ;;
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z) zflag=$OPTARG ;;
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*) usage ;;
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esac
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done
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shift $(($OPTIND - 1))
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[ $# -gt 0 ] || usage
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T=$(mktemp -d) || exit 1
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trap _cleanup EXIT INT QUIT TERM
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yyyymmdd=$(date +%Y%m%d)
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if [ -n "$hflag" ]; then
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cafile=~/.ssh/keys/hostca
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outfile=hostca-signed-keys.tgz
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else
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cafile=~/.ssh/keys/userca
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outfile=userca-signed-keys.tgz
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fi
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id=$(ssh-keygen -lf "$cafile.pub" | cut -d " " -f 3-)
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id=${id% (*)}
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if [ -z "$id" ]; then
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id=${cafile##*/}-$yyyymmdd
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fi
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eval $(ssh-agent -s)
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ssh-add "$cafile"
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for arg; do
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mkdir -p "$T/$arg"
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if [ -n "$hflag" ]; then
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f=$T/$arg/ssh_host_ed25519_key
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else
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f=$T/$arg/id_ed25519
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fi
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comment=$arg-infra-$yyyymmdd
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principals=${nflag:-$arg}
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if [ -n "$hflag" ]; then
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principals=$principals,localhost
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fi
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ssh-keygen -q -t ed25519 -C "$comment" -f "$f" ${hflag:+-N ""} &&
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ssh-keygen -Us "$cafile.pub" -I "$id" $hflag -n "$principals" \
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${Vflag:+-V "$Vflag"} ${zflag:+-z "$zflag"} "$f.pub"
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if [ $? -ne 0 ]; then
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rm -Pfr -- "$T/$arg"
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exit 1
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fi
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done
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(cd "$T" && pax -w .) | gzip >"$outfile"
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