148 lines
3.7 KiB
Nix
148 lines
3.7 KiB
Nix
{writeShellScriptBin, runtimeShell, age} :
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writeShellScriptBin "agenix" ''
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set -Eeuo pipefail
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PACKAGE="agenix"
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function show_help () {
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echo "$PACKAGE - edit and rekey age secret files"
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echo " "
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echo "$PACKAGE -e FILE [-i PRIVATE_KEY]"
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echo "$PACKAGE -r [-i PRIVATE_KEY]"
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echo ' '
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echo 'options:'
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echo '-h, --help show help'
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echo '-e, --edit FILE edits FILE using $EDITOR'
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echo '-r, --rekey re-encrypts all secrets with specified recipients'
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echo '-i, --identity identity to use when decrypting'
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echo ' '
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echo 'FILE an age-encrypted file'
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echo ' '
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echo 'PRIVATE_KEY a path to a private SSH key used to decrypt file'
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echo ' '
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echo 'EDITOR environment variable of editor to use when editing FILE'
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echo ' '
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echo 'RULES environment variable with path to Nix file specifying recipient public keys.'
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echo "Defaults to './secrets.nix'"
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}
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test $# -eq 0 && (show_help && exit 1)
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REKEY=0
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DEFAULT_DECRYPT=(--decrypt)
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while test $# -gt 0; do
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case "$1" in
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-h|--help)
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show_help
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exit 0
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;;
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-e|--edit)
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shift
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if test $# -gt 0; then
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export FILE=$1
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else
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echo "no FILE specified"
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exit 1
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fi
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shift
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;;
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-i|--identity)
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shift
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if test $# -gt 0; then
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DEFAULT_DECRYPT+=(--identity "$1")
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else
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echo "no PRIVATE_KEY specified"
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exit 1
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fi
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shift
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;;
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-r|--rekey)
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shift
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REKEY=1
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;;
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*)
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show_help
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exit 1
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;;
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esac
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done
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RULES=''${RULES:-./secrets.nix}
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function cleanup {
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if [ ! -z ''${CLEARTEXT_DIR+x} ]
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then
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rm -rf "$CLEARTEXT_DIR"
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fi
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if [ ! -z ''${REENCRYPTED_DIR+x} ]
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then
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rm -rf "$REENCRYPTED_DIR"
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fi
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}
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trap "cleanup" 0 2 3 15
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function edit {
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FILE=$1
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KEYS=$((nix-instantiate --eval -E "(let rules = import $RULES; in builtins.concatStringsSep \"\n\" rules.\"$FILE\".publicKeys)" | sed 's/"//g' | sed 's/\\n/\n/g') || exit 1)
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if [ -z "$KEYS" ]
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then
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>&2 echo "There is no rule for $FILE in $RULES."
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exit 1
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fi
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CLEARTEXT_DIR=$(mktemp -d)
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CLEARTEXT_FILE="$CLEARTEXT_DIR/$(basename "$FILE")"
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if [ -f "$FILE" ]
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then
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DECRYPT=("''${DEFAULT_DECRYPT[@]}")
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while IFS= read -r key
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do
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DECRYPT+=(--identity "$key")
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done <<<"$((find ~/.ssh -maxdepth 1 -type f -not -name "*pub" -not -name "config" -not -name "authorized_keys" -not -name "known_hosts") || exit 1)"
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DECRYPT+=(-o "$CLEARTEXT_FILE" "$FILE")
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${age}/bin/age "''${DECRYPT[@]}" || exit 1
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cp "$CLEARTEXT_FILE" "$CLEARTEXT_FILE.before"
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fi
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$EDITOR "$CLEARTEXT_FILE"
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if [ ! -f "$CLEARTEXT_FILE" ]
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then
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echo "$FILE wasn't created."
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return
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fi
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[ -f "$FILE" ] && [ "$EDITOR" != ":" ] && diff "$CLEARTEXT_FILE.before" "$CLEARTEXT_FILE" 1>/dev/null && echo "$FILE wasn't changed, skipping re-encryption." && return
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ENCRYPT=()
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while IFS= read -r key
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do
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ENCRYPT+=(--recipient "$key")
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done <<< "$KEYS"
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REENCRYPTED_DIR=$(mktemp -d)
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REENCRYPTED_FILE="$REENCRYPTED_DIR/$(basename "$FILE")"
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ENCRYPT+=(-o "$REENCRYPTED_FILE")
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${age}/bin/age "''${ENCRYPT[@]}" <"$CLEARTEXT_FILE" || exit 1
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mv -f "$REENCRYPTED_FILE" "$1"
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}
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function rekey {
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FILES=$((nix-instantiate --eval -E "(let rules = import $RULES; in builtins.concatStringsSep \"\n\" (builtins.attrNames rules))" | sed 's/"//g' | sed 's/\\n/\n/g') || exit 1)
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for FILE in $FILES
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do
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echo "rekeying $FILE..."
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EDITOR=: edit "$FILE"
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cleanup
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done
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}
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[ $REKEY -eq 1 ] && rekey && exit 0
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edit "$FILE" && cleanup && exit 0
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''
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