salt-keydiff/salt-keydiff.sh

#!/bin/sh
# Copyright 2023, Georg Pfuetzenreuter
#
# Licensed under the EUPL, Version 1.2 or - as soon they will be approved by the European Commission - subsequent versions of the EUPL (the "Licence").
# You may not use this work except in compliance with the Licence.
# An English copy of the Licence is shipped in a file called LICENSE along with this applications source code.
# You may obtain copies of the Licence in any of the official languages at https://joinup.ec.europa.eu/collection/eupl/eupl-text-eupl-12.
#
# ---
#
# This program helps with accepting Salt minion keys by asking for a key to compare with first. Intended to be run on a Salt master.

set -Ceu

minion="${1:-null}"
NOCOLOR="$(tput sgr0)"

if ! command -v jq >/dev/null || ! command -v salt-key >/dev/null
then
	printf 'Please ensure jq and salt-key are available.\n'
	exit 1
fi

if [ "$minion" = 'null' ]
then
	printf 'Please specify the minion to diff against.\n'
	exit 1
fi

key_salt="$(salt-key --out json -f "$minion" | jq --arg minion "$minion" -r '.minions_pre[$minion]')"

if [ "$key_salt" = 'null' ]
then
	printf 'No pending keys for %s.\n' "$minion"
	exit 2
fi

printf 'Enter fingerprint to diff against (run `salt-call --local key.finger` on the minion)\n'
read -r key_user

if [ "$key_salt" = "$key_user" ]
then
	GREEN="$(tput setaf 2)"
	printf '%sMatches%s\n' "$GREEN" "$NOCOLOR"
	salt-key --out=yaml -a "$minion"
elif [ ! "$key_salt" = "$key_user" ]
then
	RED="$(tput setaf 1)"
	printf '%sMismatch%s\n' "$RED" "$NOCOLOR"
	exit 2
fi