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#!/usr/bin/env bash
set -Eeuo pipefail
PACKAGE="agenix"
function show_help () {
echo "$PACKAGE - edit and rekey age secret files"
echo " "
echo "$PACKAGE -e FILE [-i PRIVATE_KEY]"
echo "$PACKAGE -r [-i PRIVATE_KEY]"
echo ' '
echo 'options:'
echo '-h, --help show help'
# shellcheck disable=SC2016
echo '-e, --edit FILE edits FILE using $EDITOR'
echo '-r, --rekey re-encrypts all secrets with specified recipients'
echo '-d, --decrypt FILE decrypts FILE to STDOUT'
echo '-i, --identity identity to use when decrypting'
echo '-v, --verbose verbose output'
echo ' '
echo 'FILE an age-encrypted file'
echo ' '
echo 'PRIVATE_KEY a path to a private SSH key used to decrypt file'
echo ' '
echo 'EDITOR environment variable of editor to use when editing FILE'
echo ' '
echo 'If STDIN is not interactive, EDITOR will be set to "cp /dev/stdin"'
echo ' '
echo 'RULES environment variable with path to Nix file specifying recipient public keys.'
echo "Defaults to './secrets.nix'"
echo ' '
echo "agenix version: @version@"
echo "age binary path: @ageBin@"
echo "age version: $(@ageBin@ --version)"
}
function warn() {
printf '%s\n' "$*" >&2
}
function err() {
warn "$*"
exit 1
}
test $# -eq 0 && (show_help && exit 1)
REKEY=0
DECRYPT_ONLY=0
DEFAULT_DECRYPT=(--decrypt)
while test $# -gt 0; do
case "$1" in
-h|--help)
show_help
exit 0
;;
-e|--edit)
shift
if test $# -gt 0; then
export FILE=$1
else
echo "no FILE specified"
exit 1
fi
shift
;;
-i|--identity)
shift
if test $# -gt 0; then
DEFAULT_DECRYPT+=(--identity "$1")
else
echo "no PRIVATE_KEY specified"
exit 1
fi
shift
;;
-r|--rekey)
shift
REKEY=1
;;
-d|--decrypt)
shift
DECRYPT_ONLY=1
if test $# -gt 0; then
export FILE=$1
else
echo "no FILE specified"
exit 1
fi
shift
;;
-v|--verbose)
shift
set -x
;;
*)
show_help
exit 1
;;
esac
done
RULES=${RULES:-./secrets.nix}
function cleanup {
if [ -n "${CLEARTEXT_DIR+x}" ]
then
rm -rf "$CLEARTEXT_DIR"
fi
if [ -n "${REENCRYPTED_DIR+x}" ]
then
rm -rf "$REENCRYPTED_DIR"
fi
}
trap "cleanup" 0 2 3 15
function keys {
(@nixInstantiate@ --eval -E "(let rules = import $RULES; in builtins.concatStringsSep \"\n\" rules.\"$1\".publicKeys)" | @sedBin@ 's/"//g' | @sedBin@ 's/\\n/\n/g') | @sedBin@ '/^$/d' || exit 1
}
function decrypt {
FILE=$1
KEYS=$2
if [ -z "$KEYS" ]
then
err "There is no rule for $FILE in $RULES."
fi
if [ -f "$FILE" ]
then
DECRYPT=("${DEFAULT_DECRYPT[@]}")
if [[ "${DECRYPT[*]}" != *"--identity"* ]]; then
if [ -f "$HOME/.ssh/id_rsa" ]; then
DECRYPT+=(--identity "$HOME/.ssh/id_rsa")
fi
if [ -f "$HOME/.ssh/id_ed25519" ]; then
DECRYPT+=(--identity "$HOME/.ssh/id_ed25519")
fi
fi
if [[ "${DECRYPT[*]}" != *"--identity"* ]]; then
err "No identity found to decrypt $FILE. Try adding an SSH key at $HOME/.ssh/id_rsa or $HOME/.ssh/id_ed25519 or using the --identity flag to specify a file."
fi
@ageBin@ "${DECRYPT[@]}" "$FILE" || exit 1
fi
}
function edit {
FILE=$1
KEYS=$(keys "$FILE") || exit 1
CLEARTEXT_DIR=$(@mktempBin@ -d)
CLEARTEXT_FILE="$CLEARTEXT_DIR/$(basename "$FILE")"
DEFAULT_DECRYPT+=(-o "$CLEARTEXT_FILE")
decrypt "$FILE" "$KEYS" || exit 1
cp "$CLEARTEXT_FILE" "$CLEARTEXT_FILE.before"
[ -t 0 ] || EDITOR='cp /dev/stdin'
$EDITOR "$CLEARTEXT_FILE"
if [ ! -f "$CLEARTEXT_FILE" ]
then
warn "$FILE wasn't created."
return
fi
[ -f "$FILE" ] && [ "$EDITOR" != ":" ] && @diffBin@ -q "$CLEARTEXT_FILE.before" "$CLEARTEXT_FILE" && warn "$FILE wasn't changed, skipping re-encryption." && return
ENCRYPT=()
while IFS= read -r key
do
ENCRYPT+=(--recipient "$key")
done <<< "$KEYS"
REENCRYPTED_DIR=$(@mktempBin@ -d)
REENCRYPTED_FILE="$REENCRYPTED_DIR/$(basename "$FILE")"
ENCRYPT+=(-o "$REENCRYPTED_FILE")
@ageBin@ --armor "${ENCRYPT[@]}" <"$CLEARTEXT_FILE" || exit 1
mv -f "$REENCRYPTED_FILE" "$1"
}
function rekey {
FILES=$( (@nixInstantiate@ --eval -E "(let rules = import $RULES; in builtins.concatStringsSep \"\n\" (builtins.attrNames rules))" | @sedBin@ 's/"//g' | @sedBin@ 's/\\n/\n/g') || exit 1)
for FILE in $FILES
do
warn "rekeying $FILE..."
EDITOR=: edit "$FILE"
cleanup
done
}
[ $REKEY -eq 1 ] && rekey && exit 0
[ $DECRYPT_ONLY -eq 1 ] && decrypt "${FILE}" "$(keys "$FILE")" && exit 0
edit "$FILE" && cleanup && exit 0