621 lines
21 KiB
Bash
Executable File
621 lines
21 KiB
Bash
Executable File
#!/bin/bash
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set -euo pipefail
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# nbcrypt - SSH Agent ベースの暗号化/復号ツール
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# Ed25519 署名で決定的な鍵導出を行う
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#
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# 環境変数: NB_SIGN_VIA_SSH, NB_SSH_PORT
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# DevContainer 等で Agent が使えないとき、NB_SIGN_VIA_SSH=user@host を指定すると
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# ホストの ~/.ssh/id_ed25519 で署名してもらう。NB_SSH_PORT でポート指定（未設定時 22）。
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SCRIPT_NAME="$(basename "$0")"
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KEY_SEED_MESSAGE="nbase2-secret-key-seed-v1"
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KEY_IDENTITY="id_ed25519"
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# 出力用の色
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RED='\033[0;31m'
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GREEN='\033[0;32m'
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YELLOW='\033[1;33m'
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NC='\033[0m' # リセット
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error() {
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echo -e "${RED}❌ Error: $*${NC}" >&2
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exit 1
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}
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info() {
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echo -e "${GREEN}ℹ️ $*${NC}" >&2
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}
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warn() {
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echo -e "${YELLOW}⚠️ $*${NC}" >&2
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}
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print_source_agent_hint() {
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local env_file="/tmp/.nb_agent_env_${USER:-$(id -un)}"
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echo "" >&2
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info "この agent を現在のシェルで使うには、次を実行:"
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echo " source $env_file" >&2
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}
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usage() {
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cat <<EOF
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Usage: $SCRIPT_NAME <command> [arguments]
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Commands:
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enc <text> Encrypt a text string (or use enctext)
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dec <text> Decrypt a text string (or use dectext)
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enctext <text> Encrypt a text string (alias for enc)
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dectext <text> Decrypt a text string (alias for dec)
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encfile <input> <output> Encrypt a file (or use encrypt)
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decfile <input> <output> Decrypt a file (or use decrypt)
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encrypt <input> <output> Encrypt a file (alias for encfile)
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decrypt [options] <input> <output> Decrypt a file (alias for decfile)
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keychain [-k|--keep] Fetch SSH keys from BWS and run ssh-add.
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Default: remove key files after ssh-add. Use -k/--keep to keep.
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install-bws Install Bitwarden Secrets Manager CLI (bws)
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check Check if SSH Agent has required key
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help Show this help message
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Options for decrypt/decfile:
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-f, --force Force download nbloader from BWS and setup SSH Agent
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(skips SSH Agent check, requires BWS_ACCESS_TOKEN)
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Text commands support stdin:
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echo "secret" | $SCRIPT_NAME enc -
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echo "encrypted" | $SCRIPT_NAME dec -
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Requirements:
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- SSH Agent with id_ed25519 key, or ~/.ssh/id_ed25519 file, or BWS_ACCESS_TOKEN,
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or NB_SIGN_VIA_SSH (DevContainer: sign via host's ~/.ssh/id_ed25519; NB_SSH_PORT for port)
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- ssh-keygen and openssl commands must be available
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Examples:
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$SCRIPT_NAME enc "secret text"
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$SCRIPT_NAME dec "ENC:U2FsdGVkX1..."
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$SCRIPT_NAME encfile secrets.txt secrets.enc
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$SCRIPT_NAME decfile secrets.enc secrets.txt
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$SCRIPT_NAME keychain
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$SCRIPT_NAME install-bws
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$SCRIPT_NAME check
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EOF
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exit 0
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}
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check_dependencies() {
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local missing=()
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for cmd in ssh-keygen openssl ssh-add; do
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if ! command -v "$cmd" >/dev/null 2>&1; then
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missing+=("$cmd")
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fi
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done
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if [ ${#missing[@]} -gt 0 ]; then
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error "Missing required commands: ${missing[*]}"
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fi
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}
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get_bws_token() {
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# 1. すでに環境変数にある
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if [ -n "${BWS_ACCESS_TOKEN:-}" ]; then
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echo "$BWS_ACCESS_TOKEN"
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return 0
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fi
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# 2. nbconf から取得を試みる
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local nbase_root="${NBASE_HOME:-$(cd "$(dirname "$0")/.." && pwd)}"
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local nbconf_cmd="${nbase_root}/bin/nbconf"
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if [ -f "$nbconf_cmd" ] && [ -x "$nbconf_cmd" ]; then
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local val
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val=$("$nbconf_cmd" get BWS_ACCESS_TOKEN -d 2>/dev/null) || true
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if [ -n "$val" ]; then
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echo "$val"
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return 0
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fi
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fi
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return 1
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}
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check_ssh_agent() {
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local env_file="/tmp/.nb_agent_env_${USER:-$(id -un)}"
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# まず、以前の BWS セットアップで作られた env ファイルがあれば読む
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# SSH_AUTH_SOCK の検査より前にやる（env にソケットパスが入っているため）
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if [ -f "$env_file" ]; then
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source "$env_file"
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info "SSH Agent environment loaded from $env_file"
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# 読んだあと ssh-add が動くか確認
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if [ -n "${SSH_AUTH_SOCK:-}" ] && [ -S "${SSH_AUTH_SOCK}" ]; then
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if ssh-add -l >/dev/null 2>&1; then
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# Ed25519 が載っているか確認
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if ssh-add -l 2>/dev/null | grep -q "ED25519"; then
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info "SSH Agent check passed (Ed25519 key found)"
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return 0
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fi
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fi
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fi
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fi
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# 現在の環境の SSH_AUTH_SOCK がセットかつ有効か（すでにシェルに Agent がある場合）
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if [ -n "${SSH_AUTH_SOCK:-}" ] && [ -S "${SSH_AUTH_SOCK}" ]; then
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# ssh-add で agent に接続できるか
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if ssh-add -l >/dev/null 2>&1; then
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# Ed25519 が載っているか確認
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if ssh-add -l 2>/dev/null | grep -q "ED25519"; then
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info "SSH Agent check passed (Ed25519 key found)"
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return 0
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fi
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fi
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fi
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# ここに来た場合: (1) env ファイルがない (2) あっても ssh-add 失敗 (3) Ed25519 がない
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# いずれも BWS から bootstrap を試す
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info "No Ed25519 key found in SSH Agent. Attempting BWS bootstrap..."
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# BWS トークン取得（環境変数、nbconf、または入力）
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local bws_token
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bws_token=$(get_bws_token) || true
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if [ -z "$bws_token" ]; then
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echo -n "Enter BWS_ACCESS_TOKEN: " >&2
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read bws_token
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if [ -z "$bws_token" ]; then
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error "BWS_ACCESS_TOKEN is required when SSH Agent has no Ed25519 key"
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fi
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fi
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# BWS からセットアップスクリプトを取得して実行
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load_bws_setup "$bws_token"
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# BWS セットアップ後に agent を再確認（env を読み直す）
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if [ -f "$env_file" ]; then
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source "$env_file"
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fi
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if [ -n "${SSH_AUTH_SOCK:-}" ] && [ -S "${SSH_AUTH_SOCK}" ]; then
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if ssh-add -l >/dev/null 2>&1; then
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if ssh-add -l 2>/dev/null | grep -q "ED25519"; then
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info "SSH Agent check passed (Ed25519 key found after BWS setup)"
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return 0
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fi
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else
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# BWS セットアップ後に ssh-add が失敗
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if [ -f "$env_file" ]; then
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warn "SSH Agent communication failed after BWS setup."
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warn "Please run: source $env_file"
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error "SSH Agent communication failed. Run 'source $env_file' and try again."
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else
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error "SSH Agent communication failed after BWS setup."
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fi
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fi
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fi
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error "No Ed25519 key found in SSH Agent. Please add id_ed25519 with: ssh-add ~/.ssh/id_ed25519"
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}
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load_bws_setup() {
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local token="$1"
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local secret_id="6e70094b-6888-4fde-85f9-b3d6007fd68e"
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info "Loading setup script from BWS (secret ID: $secret_id)..."
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# bws が無ければインストールを試す
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if ! command -v bws >/dev/null 2>&1; then
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warn "bws command not found. Attempting to install..."
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install_bws || error "Failed to install bws CLI"
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fi
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# bws 用にトークンを一時 export
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export BWS_ACCESS_TOKEN="$token"
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# 秘密 ID で BWS から secret を取得
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local loader_script
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if command -v jq >/dev/null 2>&1; then
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loader_script=$(bws secret get "$secret_id" 2>&1 | jq -r '.value // empty')
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elif command -v python3 >/dev/null 2>&1; then
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loader_script=$(bws secret get "$secret_id" 2>&1 | python3 -c "import sys, json; print(json.load(sys.stdin).get('value', ''))" 2>/dev/null)
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else
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# フォールバック: grep/sed で value を取り出し（単純 JSON 用）
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loader_script=$(bws secret get "$secret_id" 2>&1 | grep -o '"value": "[^"]*"' | sed 's/"value": "//;s/"$//' | head -1)
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fi
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if [ -z "$loader_script" ]; then
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error "Failed to retrieve secret from BWS. Check your token and secret ID."
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fi
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# ローダースクリプトを実行
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info "Executing BWS setup script..."
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eval "$loader_script"
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# 作成されていれば agent 用 env を読む
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local env_file="/tmp/.nb_agent_env_${USER:-$(id -un)}"
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if [ -f "$env_file" ]; then
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source "$env_file"
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info "SSH Agent environment loaded from $env_file"
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fi
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}
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keychain_cmd() {
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local keep_mode="$1"
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info "Fetching SSH keys from BWS and running ssh-add..."
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local bws_token
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bws_token=$(get_bws_token) || true
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if [ -z "$bws_token" ]; then
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echo -n "Enter BWS_ACCESS_TOKEN: " >&2
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read bws_token
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if [ -z "$bws_token" ]; then
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error "BWS_ACCESS_TOKEN is required"
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fi
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fi
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load_bws_setup "$bws_token"
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if [ "$keep_mode" != "true" ]; then
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info "Removing key files from disk (use -k/--keep to keep)..."
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rm -f ~/.ssh/id_rsa ~/.ssh/id_ecdsa ~/.ssh/id_ed25519
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fi
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info "SSH agent setup complete."
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ssh-add -l
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print_source_agent_hint
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}
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install_bws() {
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local arch
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arch=$(uname -m)
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local bws_version="1.0.0"
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local bws_bin_dir="${HOME}/.local/bin"
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local bws_path="${bws_bin_dir}/bws"
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mkdir -p "$bws_bin_dir"
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export PATH="$bws_bin_dir:$PATH"
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# アーキテクチャ判定
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case "$arch" in
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x86_64)
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arch="x86_64-unknown-linux-gnu"
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;;
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aarch64|arm64)
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arch="aarch64-unknown-linux-gnu"
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;;
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*)
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error "Unsupported architecture: $arch"
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;;
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esac
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local zip_name="bws-${arch}-${bws_version}.zip"
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local url="https://github.com/bitwarden/sdk-sm/releases/download/bws-v${bws_version}/${zip_name}"
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info "Downloading bws v${bws_version} for ${arch}..."
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# 必要なら unzip 等を入れる
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if ! command -v unzip >/dev/null 2>&1; then
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if command -v apt-get >/dev/null 2>&1; then
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sudo apt-get update -qq && sudo apt-get install -y unzip >/dev/null 2>&1
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elif command -v yum >/dev/null 2>&1; then
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sudo yum install -y unzip >/dev/null 2>&1
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fi
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fi
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# ダウンロードして展開
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local temp_zip="/tmp/${zip_name}"
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if command -v wget >/dev/null 2>&1; then
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wget -q "$url" -O "$temp_zip" || return 1
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elif command -v curl >/dev/null 2>&1; then
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curl -sL "$url" -o "$temp_zip" || return 1
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else
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error "wget or curl is required to download bws"
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fi
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unzip -o "$temp_zip" -d "$bws_bin_dir" >/dev/null 2>&1 || return 1
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chmod +x "$bws_path"
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rm -f "$temp_zip"
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info "bws installed successfully at $bws_path"
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return 0
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}
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derive_key() {
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# Ed25519 署名から暗号鍵を導出（同じメッセージなら同じ署名で決定的）
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# 優先順位: 1. SSH Agent, 2. 秘密鍵ファイル, 3. NB_SIGN_VIA_SSH, 4. BWS (check_ssh_agent で処理)
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local temp_message=$(mktemp)
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local temp_sig=$(mktemp)
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local temp_pubkey=$(mktemp)
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local temp_allowed=$(mktemp)
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trap "rm -f '$temp_message' '$temp_sig' '$temp_pubkey' '$temp_allowed'" EXIT
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# 署名するメッセージを作成
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echo -n "$KEY_SEED_MESSAGE" > "$temp_message"
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# 1. SSH Agent から Ed25519 の公開鍵を取得を試みる
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ssh-add -L 2>/dev/null | grep "ssh-ed25519" | head -1 | awk '{print $1 " " $2}' > "$temp_pubkey" 2>/dev/null
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if [ -s "$temp_pubkey" ]; then
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# Agent から取得できた場合
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echo "key1 $(cat "$temp_pubkey")" > "$temp_allowed"
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# メッセージに署名（Agent経由）
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if ssh-keygen -Y sign -f "$temp_allowed" -n "nbase2" < "$temp_message" > "$temp_sig" 2>/dev/null; then
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# 署名を抜き出してハッシュし 256bit 鍵に
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cat "$temp_sig" | base64 -d 2>/dev/null | sha256sum | head -c 64
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return 0
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fi
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fi
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# 2. 秘密鍵ファイルから直接署名を試みる
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local key_file="${NB_KEY_FILE:-${HOME}/.ssh/id_ed25519}"
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if [ -f "$key_file" ]; then
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# 公開鍵を抽出
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if ssh-keygen -y -f "$key_file" 2>/dev/null | awk '{print $1 " " $2}' > "$temp_pubkey" 2>/dev/null && [ -s "$temp_pubkey" ]; then
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echo "key1 $(cat "$temp_pubkey")" > "$temp_allowed"
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# 秘密鍵ファイルを使って署名
|
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if ssh-keygen -Y sign -f "$key_file" -n "nbase2" < "$temp_message" > "$temp_sig" 2>/dev/null; then
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# 署名を抜き出してハッシュし 256bit 鍵に
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cat "$temp_sig" | base64 -d 2>/dev/null | sha256sum | head -c 64
|
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return 0
|
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fi
|
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fi
|
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fi
|
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|
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# 3. ホスト SSH: NB_SIGN_VIA_SSH / NB_SSH_PORT（未設定時 nodoka@host.docker.internal:60516）で ~/.ssh/id_ed25519 に署名してもらう
|
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if ssh -o BatchMode=yes -o ConnectTimeout=10 -o StrictHostKeyChecking=accept-new -p "${NB_SSH_PORT:-60516}" "${NB_SIGN_VIA_SSH:-nodoka@host.docker.internal}" 'echo -n "nbase2-secret-key-seed-v1" | ssh-keygen -Y sign -f ~/.ssh/id_ed25519 -n "nbase2"' > "$temp_sig" 2>/dev/null; then
|
||
_key=$(cat "$temp_sig" | base64 -d 2>/dev/null | sha256sum | head -c 64)
|
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if [[ "${_key:-}" =~ ^[0-9a-f]{64}$ ]]; then
|
||
echo -n "$_key"
|
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return 0
|
||
fi
|
||
fi
|
||
|
||
# 4. どれも失敗した場合、エラー（BWS は check_ssh_agent で処理される）
|
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error "Could not derive key from SSH Agent, private key file, or host. Ensure SSH Agent has Ed25519, or set NB_KEY_FILE. Host: NB_SIGN_VIA_SSH/NB_SSH_PORT (default nodoka@host.docker.internal:60516)."
|
||
}
|
||
|
||
encrypt_file() {
|
||
local input="$1"
|
||
local output="$2"
|
||
|
||
if [ ! -f "$input" ]; then
|
||
error "Input file not found: $input"
|
||
fi
|
||
|
||
# 秘密鍵ファイルまたは NB_SIGN_VIA_SSH がある場合は check_ssh_agent をスキップ
|
||
local key_file="${NB_KEY_FILE:-${HOME}/.ssh/id_ed25519}"
|
||
if [ ! -f "$key_file" ] && [ -z "${NB_SIGN_VIA_SSH:-}" ]; then
|
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check_ssh_agent
|
||
fi
|
||
|
||
info "Deriving encryption key..."
|
||
local key=$(derive_key)
|
||
|
||
if [ -z "$key" ]; then
|
||
error "Failed to derive encryption key"
|
||
fi
|
||
|
||
info "Encrypting $input -> $output..."
|
||
|
||
# OpenSSL で AES-256-CBC 暗号化（鍵は hex で渡す）
|
||
openssl enc -aes-256-cbc -salt -pbkdf2 -in "$input" -out "$output" -pass "pass:$key"
|
||
|
||
if [ $? -eq 0 ]; then
|
||
info "✅ Encryption successful: $output"
|
||
else
|
||
error "Encryption failed"
|
||
fi
|
||
}
|
||
|
||
decrypt_file() {
|
||
local force_mode="$1"
|
||
local input="$2"
|
||
local output="$3"
|
||
|
||
if [ ! -f "$input" ]; then
|
||
error "Input file not found: $input"
|
||
fi
|
||
|
||
# force: SSH Agent チェックを飛ばし BWS から直接読む
|
||
if [ "$force_mode" = "true" ]; then
|
||
info "Force mode: Loading setup script from BWS..."
|
||
local bws_token
|
||
bws_token=$(get_bws_token) || true
|
||
if [ -z "$bws_token" ]; then
|
||
echo -n "Enter BWS_ACCESS_TOKEN: " >&2
|
||
read bws_token
|
||
if [ -z "$bws_token" ]; then
|
||
error "BWS_ACCESS_TOKEN is required in force mode"
|
||
fi
|
||
fi
|
||
load_bws_setup "$bws_token"
|
||
# BWS セットアップ後に agent を再確認
|
||
if [ -z "${SSH_AUTH_SOCK:-}" ] || [ ! -S "${SSH_AUTH_SOCK}" ]; then
|
||
error "SSH Agent not available after BWS setup"
|
||
fi
|
||
if ! ssh-add -l >/dev/null 2>&1 || ! ssh-add -l 2>/dev/null | grep -q "ED25519"; then
|
||
error "Ed25519 key not found in SSH Agent after BWS setup"
|
||
fi
|
||
else
|
||
# 秘密鍵ファイルまたは NB_SIGN_VIA_SSH がある場合は check_ssh_agent をスキップ
|
||
local key_file="${NB_KEY_FILE:-${HOME}/.ssh/id_ed25519}"
|
||
if [ ! -f "$key_file" ] && [ -z "${NB_SIGN_VIA_SSH:-}" ]; then
|
||
check_ssh_agent
|
||
fi
|
||
fi
|
||
|
||
info "Deriving decryption key..."
|
||
local key=$(derive_key)
|
||
|
||
if [ -z "$key" ]; then
|
||
error "Failed to derive decryption key"
|
||
fi
|
||
|
||
info "Decrypting $input -> $output..."
|
||
|
||
# OpenSSL で AES-256-CBC 復号
|
||
if openssl enc -aes-256-cbc -d -salt -pbkdf2 -in "$input" -out "$output" -pass "pass:$key" 2>/dev/null; then
|
||
info "✅ Decryption successful: $output"
|
||
else
|
||
error "Decryption failed (wrong key or corrupted file)"
|
||
fi
|
||
}
|
||
|
||
encrypt_text() {
|
||
local input_text="$1"
|
||
|
||
# 秘密鍵ファイルまたは NB_SIGN_VIA_SSH がある場合は check_ssh_agent をスキップ
|
||
local key_file="${NB_KEY_FILE:-${HOME}/.ssh/id_ed25519}"
|
||
if [ ! -f "$key_file" ] && [ -z "${NB_SIGN_VIA_SSH:-}" ]; then
|
||
check_ssh_agent
|
||
fi
|
||
|
||
info "Deriving encryption key..."
|
||
local key=$(derive_key)
|
||
|
||
if [ -z "$key" ]; then
|
||
error "Failed to derive encryption key"
|
||
fi
|
||
|
||
# 標準入力から読み取る場合
|
||
if [ "$input_text" = "-" ]; then
|
||
local temp_input=$(mktemp)
|
||
cat > "$temp_input"
|
||
input_text=$(cat "$temp_input")
|
||
rm -f "$temp_input"
|
||
fi
|
||
|
||
# OpenSSL で暗号化して Base64 エンコード
|
||
echo -n "$input_text" | openssl enc -aes-256-cbc -salt -pbkdf2 -pass "pass:$key" | base64 -w 0
|
||
echo "" # 改行を追加
|
||
}
|
||
|
||
decrypt_text() {
|
||
local input_text="$1"
|
||
|
||
# 秘密鍵ファイルまたは NB_SIGN_VIA_SSH がある場合は check_ssh_agent をスキップ
|
||
local key_file="${NB_KEY_FILE:-${HOME}/.ssh/id_ed25519}"
|
||
if [ ! -f "$key_file" ] && [ -z "${NB_SIGN_VIA_SSH:-}" ]; then
|
||
check_ssh_agent
|
||
fi
|
||
|
||
info "Deriving decryption key..."
|
||
local key=$(derive_key)
|
||
|
||
if [ -z "$key" ]; then
|
||
error "Failed to derive decryption key"
|
||
fi
|
||
|
||
# 標準入力から読み取る場合
|
||
if [ "$input_text" = "-" ]; then
|
||
input_text=$(cat)
|
||
fi
|
||
|
||
# Base64 デコードして OpenSSL で復号
|
||
echo -n "$input_text" | base64 -d 2>/dev/null | openssl enc -aes-256-cbc -d -salt -pbkdf2 -pass "pass:$key" 2>/dev/null || error "Decryption failed (wrong key or corrupted data)"
|
||
}
|
||
|
||
# メインのコマンド分岐
|
||
main() {
|
||
if [ $# -eq 0 ]; then
|
||
usage
|
||
fi
|
||
|
||
local command="$1"
|
||
shift
|
||
|
||
# install-bws, keychain の場合は check_dependencies をスキップ
|
||
if [ "$command" != "install-bws" ] && [ "$command" != "keychain" ] && [ "$command" != "help" ] && [ "$command" != "--help" ] && [ "$command" != "-h" ]; then
|
||
check_dependencies
|
||
fi
|
||
|
||
case "$command" in
|
||
enc|enctext)
|
||
if [ $# -lt 1 ]; then
|
||
error "enc requires 1 argument: <text> or '-' for stdin"
|
||
fi
|
||
encrypt_text "${1:-}"
|
||
;;
|
||
dec|dectext)
|
||
if [ $# -lt 1 ]; then
|
||
error "dec requires 1 argument: <text> or '-' for stdin"
|
||
fi
|
||
decrypt_text "${1:-}"
|
||
;;
|
||
encfile|encrypt)
|
||
if [ $# -ne 2 ]; then
|
||
error "encfile requires 2 arguments: <input> <output>"
|
||
fi
|
||
encrypt_file "$1" "$2"
|
||
;;
|
||
decfile|decrypt)
|
||
local force_mode=false
|
||
local input=""
|
||
local output=""
|
||
|
||
# 引数解析
|
||
while [ $# -gt 0 ]; do
|
||
case "$1" in
|
||
-f|--force)
|
||
force_mode=true
|
||
shift
|
||
;;
|
||
-*)
|
||
error "Unknown option: $1"
|
||
;;
|
||
*)
|
||
if [ -z "$input" ]; then
|
||
input="$1"
|
||
elif [ -z "$output" ]; then
|
||
output="$1"
|
||
else
|
||
error "Too many arguments for decrypt"
|
||
fi
|
||
shift
|
||
;;
|
||
esac
|
||
done
|
||
|
||
if [ -z "$input" ] || [ -z "$output" ]; then
|
||
error "decfile requires 2 arguments: <input> <output>"
|
||
fi
|
||
|
||
decrypt_file "$force_mode" "$input" "$output"
|
||
;;
|
||
check)
|
||
check_ssh_agent
|
||
echo "✅ All checks passed"
|
||
;;
|
||
keychain)
|
||
local keep_mode=false
|
||
while [ $# -gt 0 ]; do
|
||
case "$1" in
|
||
-k|--keep)
|
||
keep_mode=true
|
||
shift
|
||
;;
|
||
-*)
|
||
error "Unknown option: $1"
|
||
;;
|
||
*)
|
||
error "keychain accepts only -k/--keep"
|
||
;;
|
||
esac
|
||
done
|
||
keychain_cmd "$keep_mode"
|
||
;;
|
||
install-bws)
|
||
install_bws
|
||
;;
|
||
help|--help|-h)
|
||
usage
|
||
;;
|
||
*)
|
||
error "Unknown command: $command (use 'help' for usage)"
|
||
;;
|
||
esac
|
||
}
|
||
|
||
main "$@"
|
||
|