fnshell/push-sshkey-to-fnos.sh

#!/bin/sh
set -e

# ===== 参数 =====
USER_NAME="$1"
NAS_IP="$2"

KEY_DIR="/root/.ssh"
KEY_NAME="id_dropbear"
PRIV_KEY="$KEY_DIR/$KEY_NAME"
PUB_KEY="$KEY_DIR/$KEY_NAME.pub"

# ===== 参数检查 =====
if [ -z "$USER_NAME" ] || [ -z "$NAS_IP" ]; then
  echo "用法: $0 <飞牛用户名> <飞牛IP>"
  exit 1
fi

# ===== 阶段一：在 OpenWrt 上生成 SSH 密钥 =====
echo "== [1/2] 检查并生成 SSH 密钥 =="

if [ ! -d "$KEY_DIR" ]; then
  mkdir -p "$KEY_DIR"
  chmod 700 "$KEY_DIR"
fi

if [ ! -f "$PRIV_KEY" ]; then
  echo "未发现 SSH 密钥，开始生成（ed25519）..."
  ssh-keygen -t ed25519 -f "$PRIV_KEY" -N ""
else
  echo "已存在 SSH 密钥，跳过生成"
fi

# ===== 阶段二：检测远程是否能免密，首次登录提示手动输入密码 =====
echo "== [2/2] 推送公钥到飞牛 NAS =="

# 尝试用公钥免密登录
ssh -o BatchMode=yes "$USER_NAME@$NAS_IP" "echo '免密测试成功'" >/dev/null 2>&1
if [ $? -ne 0 ]; then
  echo "⚠️  检测到首次登录，需手动输入密码并确认 host key"
  echo "请在提示时输入密码，完成一次手动登录，然后再运行脚本即可实现免密"
  echo "你可以先运行： ssh $USER_NAME@$NAS_IP"
  exit 1
fi

# 远程操作：创建 .ssh 目录及权限
ssh "$USER_NAME@$NAS_IP" << 'EOF'
set -e

# 使用远程真实 HOME
HOME_DIR="$HOME"
SSH_DIR="$HOME_DIR/.ssh"
AUTH_KEYS="$SSH_DIR/authorized_keys"

mkdir -p "$SSH_DIR"
chmod 700 "$SSH_DIR"

touch "$AUTH_KEYS"
chmod 600 "$AUTH_KEYS"
EOF

# 推送公钥到远程 authorized_keys
cat "$PUB_KEY" | ssh "$USER_NAME@$NAS_IP" "cat >> ~/.ssh/authorized_keys"

echo "✅ SSH 公钥已成功推送：$USER_NAME@$NAS_IP"
echo "ℹ️  以后可直接免密登录（ssh $USER_NAME@$NAS_IP）"