重构SSH安全配置脚本，添加状态检查、用户确认及持久化备份功能
This commit is contained in:
eddy
@@ -1,6 +1,10 @@
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#!/bin/bash
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# chmod +x 00-disable-password.sh && ./00-disable-password.sh
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# curl -sS -O https://gitea.tohub.top/Share/vps/raw/branch/main/init/00-disable-password.sh && chmod +x 00-disable-password.sh && ./00-disable-password.sh
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# 用法:
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# 启用安全模式: ./00-disable-password.sh enable
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# 关闭安全模式: ./00-disable-password.sh disable
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# 查看状态: ./00-disable-password.sh status
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#
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# curl -sS -O https://gitea.tohub.top/Share/vps/raw/branch/main/init/00-disable-password.sh && chmod +x 00-disable-password.sh
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set -e # 遇到错误立即退出
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@@ -8,6 +12,7 @@ set -e # 遇到错误立即退出
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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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BLUE='\033[0;34m'
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NC='\033[0m' # No Color
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# 日志函数
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@@ -23,9 +28,15 @@ log_error() {
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echo -e "${RED}[ERROR]${NC} $1"
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}
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log_status() {
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echo -e "${BLUE}[STATUS]${NC} $1"
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}
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# 用户设置
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NEW_SSH_PORT="4399" # 根据需求修改端口
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DEFAULT_SSH_PORT="22"
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BACKUP_DIR="/root/ssh_backup_$(date +%Y%m%d_%H%M%S)"
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PERSISTENT_BACKUP_DIR="/root/ssh_config_backup"
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# 检查是否为root用户
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if [ "$EUID" -ne 0 ]; then
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@@ -33,9 +44,85 @@ if [ "$EUID" -ne 0 ]; then
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exit 1
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fi
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# 创建备份目录
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mkdir -p "$BACKUP_DIR"
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log_info "备份目录: $BACKUP_DIR"
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# 显示使用帮助
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show_usage() {
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echo "用法: $0 {enable|disable|status}"
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echo ""
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echo "命令:"
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echo " enable - 启用 SSH 安全模式（禁用密码登录，使用密钥认证）"
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echo " disable - 关闭 SSH 安全模式（恢复密码登录）"
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echo " status - 查看当前 SSH 配置状态"
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echo ""
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echo "示例:"
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echo " $0 enable # 启用安全模式"
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echo " $0 disable # 关闭安全模式"
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echo " $0 status # 查看状态"
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exit 1
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}
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# 获取当前SSH配置状态
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get_ssh_config_value() {
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local key=$1
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local config_file="/etc/ssh/sshd_config"
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# 获取配置值（忽略注释行）
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grep "^${key}" "$config_file" 2>/dev/null | awk '{print $2}' | head -n1
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}
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# 检查当前状态
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check_current_status() {
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local port=$(get_ssh_config_value "Port")
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local password_auth=$(get_ssh_config_value "PasswordAuthentication")
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local pubkey_auth=$(get_ssh_config_value "PubkeyAuthentication")
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local permit_root=$(get_ssh_config_value "PermitRootLogin")
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# 默认值
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port=${port:-22}
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password_auth=${password_auth:-yes}
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pubkey_auth=${pubkey_auth:-yes}
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permit_root=${permit_root:-yes}
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echo "当前 SSH 配置状态:"
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echo "----------------------------------------"
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echo " SSH 端口: $port"
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echo " 密码认证: $password_auth"
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echo " 公钥认证: $pubkey_auth"
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echo " Root登录: $permit_root"
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echo "----------------------------------------"
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# 判断是否为安全模式
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if [[ "$password_auth" == "no" ]] && [[ "$pubkey_auth" == "yes" ]]; then
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log_status "当前处于【安全模式】- 密码登录已禁用"
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return 0 # 安全模式
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else
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log_status "当前处于【普通模式】- 密码登录已启用"
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return 1 # 普通模式
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fi
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}
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# 显示状态
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show_status() {
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log_info "正在检查 SSH 配置状态..."
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echo ""
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check_current_status
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# 检查是否有备份
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if [ -d "$PERSISTENT_BACKUP_DIR" ] && [ -f "$PERSISTENT_BACKUP_DIR/sshd_config.original" ]; then
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echo ""
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log_info "找到配置备份: $PERSISTENT_BACKUP_DIR"
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fi
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}
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# 创建持久化备份
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create_persistent_backup() {
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if [ ! -d "$PERSISTENT_BACKUP_DIR" ]; then
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mkdir -p "$PERSISTENT_BACKUP_DIR"
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cp /etc/ssh/sshd_config "$PERSISTENT_BACKUP_DIR/sshd_config.original"
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log_info "已创建原始配置备份: $PERSISTENT_BACKUP_DIR/sshd_config.original"
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else
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log_info "使用现有配置备份: $PERSISTENT_BACKUP_DIR"
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fi
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}
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# 1. 检查公钥是否存在
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check_ssh_keys() {
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@@ -60,20 +147,31 @@ check_ssh_keys() {
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# 2. 检查端口是否被占用
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check_port() {
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log_info "检查端口 $NEW_SSH_PORT 是否可用..."
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local port=$1
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log_info "检查端口 $port 是否可用..."
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if ss -tlnp | grep -q ":$NEW_SSH_PORT "; then
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log_error "端口 $NEW_SSH_PORT 已被占用！"
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ss -tlnp | grep ":$NEW_SSH_PORT "
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exit 1
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if ss -tlnp 2>/dev/null | grep -q ":$port " || netstat -tlnp 2>/dev/null | grep -q ":$port "; then
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# 检查是否是SSH服务占用
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if ss -tlnp 2>/dev/null | grep ":$port " | grep -q "sshd" || netstat -tlnp 2>/dev/null | grep ":$port " | grep -q "sshd"; then
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log_info "端口 $port 已被 SSH 服务占用（正常）"
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else
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log_error "端口 $port 已被其他服务占用！"
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ss -tlnp 2>/dev/null | grep ":$port " || netstat -tlnp 2>/dev/null | grep ":$port "
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exit 1
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fi
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else
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log_info "端口 $port 可用"
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fi
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log_info "端口 $NEW_SSH_PORT 可用"
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}
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# 3. 关闭 SSH 密码登录并启用密钥认证
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disable_password_login() {
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# 3. 修改SSH配置
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modify_ssh_config() {
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local mode=$1 # enable 或 disable
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log_info "开始配置 SSH..."
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# 创建临时备份目录
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mkdir -p "$BACKUP_DIR"
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# 备份原始配置
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cp /etc/ssh/sshd_config "$BACKUP_DIR/sshd_config.bak"
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log_info "已备份 SSH 配置到: $BACKUP_DIR/sshd_config.bak"
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@@ -81,46 +179,87 @@ disable_password_login() {
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# 创建新配置
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cp /etc/ssh/sshd_config /etc/ssh/sshd_config.tmp
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# 修改配置（更安全的方式）
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# 1. 禁止 root 密码登录，但允许密钥登录
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if grep -q "^PermitRootLogin" /etc/ssh/sshd_config.tmp; then
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sed -i 's/^PermitRootLogin.*/PermitRootLogin prohibit-password/' /etc/ssh/sshd_config.tmp
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else
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echo "PermitRootLogin prohibit-password" >> /etc/ssh/sshd_config.tmp
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fi
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if [ "$mode" == "enable" ]; then
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log_info "配置安全模式..."
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# 2. 禁用密码认证
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if grep -q "^PasswordAuthentication" /etc/ssh/sshd_config.tmp; then
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sed -i 's/^PasswordAuthentication.*/PasswordAuthentication no/' /etc/ssh/sshd_config.tmp
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else
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echo "PasswordAuthentication no" >> /etc/ssh/sshd_config.tmp
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fi
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# 1. 禁止 root 密码登录，但允许密钥登录
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if grep -q "^PermitRootLogin" /etc/ssh/sshd_config.tmp; then
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sed -i 's/^PermitRootLogin.*/PermitRootLogin prohibit-password/' /etc/ssh/sshd_config.tmp
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else
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sed -i 's/^#PermitRootLogin.*/PermitRootLogin prohibit-password/' /etc/ssh/sshd_config.tmp
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fi
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# 3. 启用公钥认证
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if grep -q "^PubkeyAuthentication" /etc/ssh/sshd_config.tmp; then
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sed -i 's/^PubkeyAuthentication.*/PubkeyAuthentication yes/' /etc/ssh/sshd_config.tmp
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else
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echo "PubkeyAuthentication yes" >> /etc/ssh/sshd_config.tmp
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fi
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# 2. 禁用密码认证
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if grep -q "^PasswordAuthentication" /etc/ssh/sshd_config.tmp; then
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sed -i 's/^PasswordAuthentication.*/PasswordAuthentication no/' /etc/ssh/sshd_config.tmp
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else
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sed -i 's/^#PasswordAuthentication.*/PasswordAuthentication no/' /etc/ssh/sshd_config.tmp
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fi
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# 4. 修改端口
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if grep -q "^Port " /etc/ssh/sshd_config.tmp; then
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sed -i "s/^Port [0-9]\+/Port $NEW_SSH_PORT/" /etc/ssh/sshd_config.tmp
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else
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sed -i "s/^#Port 22/Port $NEW_SSH_PORT/" /etc/ssh/sshd_config.tmp
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fi
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# 3. 启用公钥认证
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if grep -q "^PubkeyAuthentication" /etc/ssh/sshd_config.tmp; then
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sed -i 's/^PubkeyAuthentication.*/PubkeyAuthentication yes/' /etc/ssh/sshd_config.tmp
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else
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sed -i 's/^#PubkeyAuthentication.*/PubkeyAuthentication yes/' /etc/ssh/sshd_config.tmp
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fi
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# 5. 额外的安全加固
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# 禁用空密码
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if grep -q "^PermitEmptyPasswords" /etc/ssh/sshd_config.tmp; then
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sed -i 's/^PermitEmptyPasswords.*/PermitEmptyPasswords no/' /etc/ssh/sshd_config.tmp
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else
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echo "PermitEmptyPasswords no" >> /etc/ssh/sshd_config.tmp
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fi
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# 4. 修改端口
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if grep -q "^Port " /etc/ssh/sshd_config.tmp; then
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sed -i "s/^Port [0-9]\+/Port $NEW_SSH_PORT/" /etc/ssh/sshd_config.tmp
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else
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sed -i "s/^#Port 22/Port $NEW_SSH_PORT/" /etc/ssh/sshd_config.tmp
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fi
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# 禁用质询响应认证
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if grep -q "^ChallengeResponseAuthentication" /etc/ssh/sshd_config.tmp; then
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sed -i 's/^ChallengeResponseAuthentication.*/ChallengeResponseAuthentication no/' /etc/ssh/sshd_config.tmp
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# 5. 额外的安全加固
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# 禁用空密码
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if grep -q "^PermitEmptyPasswords" /etc/ssh/sshd_config.tmp; then
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sed -i 's/^PermitEmptyPasswords.*/PermitEmptyPasswords no/' /etc/ssh/sshd_config.tmp
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else
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sed -i 's/^#PermitEmptyPasswords.*/PermitEmptyPasswords no/' /etc/ssh/sshd_config.tmp
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fi
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# 禁用质询响应认证
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if grep -q "^ChallengeResponseAuthentication" /etc/ssh/sshd_config.tmp; then
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sed -i 's/^ChallengeResponseAuthentication.*/ChallengeResponseAuthentication no/' /etc/ssh/sshd_config.tmp
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fi
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elif [ "$mode" == "disable" ]; then
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log_info "配置普通模式（允许密码登录）..."
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# 如果有原始备份，直接恢复
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if [ -f "$PERSISTENT_BACKUP_DIR/sshd_config.original" ]; then
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log_info "从原始备份恢复配置..."
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cp "$PERSISTENT_BACKUP_DIR/sshd_config.original" /etc/ssh/sshd_config.tmp
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else
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# 手动修改为允许密码登录
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log_info "手动修改配置..."
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# 1. 允许 root 密码登录
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if grep -q "^PermitRootLogin" /etc/ssh/sshd_config.tmp; then
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sed -i 's/^PermitRootLogin.*/PermitRootLogin yes/' /etc/ssh/sshd_config.tmp
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else
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sed -i 's/^#PermitRootLogin.*/PermitRootLogin yes/' /etc/ssh/sshd_config.tmp
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fi
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# 2. 启用密码认证
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if grep -q "^PasswordAuthentication" /etc/ssh/sshd_config.tmp; then
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sed -i 's/^PasswordAuthentication.*/PasswordAuthentication yes/' /etc/ssh/sshd_config.tmp
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else
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sed -i 's/^#PasswordAuthentication.*/PasswordAuthentication yes/' /etc/ssh/sshd_config.tmp
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fi
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# 3. 启用公钥认证（保持）
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if grep -q "^PubkeyAuthentication" /etc/ssh/sshd_config.tmp; then
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sed -i 's/^PubkeyAuthentication.*/PubkeyAuthentication yes/' /etc/ssh/sshd_config.tmp
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else
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sed -i 's/^#PubkeyAuthentication.*/PubkeyAuthentication yes/' /etc/ssh/sshd_config.tmp
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fi
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# 4. 恢复默认端口
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if grep -q "^Port " /etc/ssh/sshd_config.tmp; then
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sed -i "s/^Port [0-9]\+/Port $DEFAULT_SSH_PORT/" /etc/ssh/sshd_config.tmp
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fi
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fi
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fi
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# 验证配置文件语法
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@@ -154,8 +293,8 @@ restart_ssh() {
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fi
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}
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# 5. 配置防火墙
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configure_firewall() {
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# 5. 配置防火墙（启用模式）
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configure_firewall_enable() {
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log_info "配置防火墙..."
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# 检查系统并安装 UFW
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@@ -165,6 +304,7 @@ configure_firewall() {
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fi
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# 备份当前防火墙规则
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mkdir -p "$BACKUP_DIR"
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ufw status numbered > "$BACKUP_DIR/ufw_rules.bak" 2>/dev/null || true
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# 配置防火墙规则
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@@ -188,42 +328,47 @@ configure_firewall() {
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ufw status verbose
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}
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# 6. 显示最终信息
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show_summary() {
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echo ""
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echo "========================================"
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log_info "SSH 安全配置完成！"
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echo "========================================"
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echo ""
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echo "修改后的配置:"
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echo " - SSH 端口: $NEW_SSH_PORT"
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echo " - 密码登录: 已禁用"
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echo " - 密钥登录: 已启用"
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echo " - Root 密码登录: 已禁用"
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echo ""
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echo "备份信息:"
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echo " - 备份目录: $BACKUP_DIR"
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echo " - SSH 配置备份: $BACKUP_DIR/sshd_config.bak"
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echo ""
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echo "重要提示:"
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echo " 1. 请勿关闭当前 SSH 连接"
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echo " 2. 在新终端测试登录: ssh -p $NEW_SSH_PORT root@your_server_ip"
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echo " 3. 确认新连接成功后再关闭此窗口"
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echo " 4. 如果无法登录，可以使用以下命令恢复:"
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echo " cp $BACKUP_DIR/sshd_config.bak /etc/ssh/sshd_config"
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echo " systemctl restart sshd"
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echo ""
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echo "========================================"
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# 6. 配置防火墙（禁用模式）
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configure_firewall_disable() {
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log_info "恢复防火墙配置..."
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if ! command -v ufw &> /dev/null; then
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log_info "未安装 UFW，跳过防火墙配置"
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return
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fi
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# 允许默认SSH端口
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ufw allow $DEFAULT_SSH_PORT/tcp comment "SSH"
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log_info "已允许默认 SSH 端口 $DEFAULT_SSH_PORT"
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# 询问是否删除自定义端口规则
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read -p "是否删除自定义 SSH 端口 $NEW_SSH_PORT 的防火墙规则? (y/n): " remove_port
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if [[ $remove_port =~ ^[Yy]$ ]]; then
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ufw delete allow $NEW_SSH_PORT/tcp 2>/dev/null || true
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log_info "已删除端口 $NEW_SSH_PORT 的防火墙规则"
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fi
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ufw status verbose
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}
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# 主流程
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main() {
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log_info "开始 SSH 安全配置..."
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# 启用安全模式
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enable_security() {
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log_info "=== 启用 SSH 安全模式 ==="
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echo ""
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# 检查当前状态
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if check_current_status > /dev/null 2>&1; then
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log_warn "SSH 已经处于安全模式"
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read -p "是否要重新配置? (y/n): " reconfig
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if [[ ! $reconfig =~ ^[Yy]$ ]]; then
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log_info "操作已取消"
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exit 0
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fi
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fi
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# 显示当前配置
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log_info "当前 SSH 配置:"
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echo " - 当前端口: $(grep "^Port " /etc/ssh/sshd_config 2>/dev/null || echo "22 (默认)")"
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echo " - 当前端口: $(get_ssh_config_value "Port" || echo "22 (默认)")"
|
||||
echo " - 将修改为: $NEW_SSH_PORT"
|
||||
echo ""
|
||||
|
||||
@@ -234,13 +379,109 @@ main() {
|
||||
exit 0
|
||||
fi
|
||||
|
||||
# 创建持久化备份
|
||||
create_persistent_backup
|
||||
|
||||
# 执行配置
|
||||
check_ssh_keys
|
||||
check_port
|
||||
disable_password_login
|
||||
check_port "$NEW_SSH_PORT"
|
||||
modify_ssh_config "enable"
|
||||
restart_ssh
|
||||
configure_firewall
|
||||
show_summary
|
||||
configure_firewall_enable
|
||||
|
||||
# 显示完成信息
|
||||
echo ""
|
||||
echo "========================================"
|
||||
log_info "SSH 安全模式已启用！"
|
||||
echo "========================================"
|
||||
echo ""
|
||||
echo "修改后的配置:"
|
||||
echo " - SSH 端口: $NEW_SSH_PORT"
|
||||
echo " - 密码登录: 已禁用"
|
||||
echo " - 密钥登录: 已启用"
|
||||
echo " - Root 密码登录: 已禁用"
|
||||
echo ""
|
||||
echo "备份信息:"
|
||||
echo " - 临时备份: $BACKUP_DIR"
|
||||
echo " - 永久备份: $PERSISTENT_BACKUP_DIR"
|
||||
echo ""
|
||||
echo "重要提示:"
|
||||
echo " 1. 请勿关闭当前 SSH 连接"
|
||||
echo " 2. 在新终端测试登录: ssh -p $NEW_SSH_PORT root@your_server_ip"
|
||||
echo " 3. 确认新连接成功后再关闭此窗口"
|
||||
echo " 4. 如需恢复，运行: $0 disable"
|
||||
echo ""
|
||||
echo "========================================"
|
||||
}
|
||||
|
||||
# 关闭安全模式
|
||||
disable_security() {
|
||||
log_info "=== 关闭 SSH 安全模式 ==="
|
||||
echo ""
|
||||
|
||||
# 检查当前状态
|
||||
if ! check_current_status > /dev/null 2>&1; then
|
||||
log_warn "SSH 已经处于普通模式"
|
||||
read -p "是否要重新配置? (y/n): " reconfig
|
||||
if [[ ! $reconfig =~ ^[Yy]$ ]]; then
|
||||
log_info "操作已取消"
|
||||
exit 0
|
||||
fi
|
||||
fi
|
||||
|
||||
# 警告
|
||||
log_warn "警告: 此操作将允许密码登录，安全性会降低！"
|
||||
read -p "确认要关闭安全模式吗? (输入 YES 继续): " confirm
|
||||
if [ "$confirm" != "YES" ]; then
|
||||
log_info "操作已取消"
|
||||
exit 0
|
||||
fi
|
||||
|
||||
# 执行配置
|
||||
check_port "$DEFAULT_SSH_PORT"
|
||||
modify_ssh_config "disable"
|
||||
restart_ssh
|
||||
configure_firewall_disable
|
||||
|
||||
# 显示完成信息
|
||||
echo ""
|
||||
echo "========================================"
|
||||
log_info "SSH 安全模式已关闭！"
|
||||
echo "========================================"
|
||||
echo ""
|
||||
echo "修改后的配置:"
|
||||
echo " - SSH 端口: $DEFAULT_SSH_PORT"
|
||||
echo " - 密码登录: 已启用"
|
||||
echo " - 密钥登录: 已启用"
|
||||
echo ""
|
||||
echo "重要提示:"
|
||||
echo " 1. 请勿关闭当前 SSH 连接"
|
||||
echo " 2. 在新终端测试登录: ssh -p $DEFAULT_SSH_PORT root@your_server_ip"
|
||||
echo " 3. 确认新连接成功后再关闭此窗口"
|
||||
echo " 4. 如需重新启用安全模式，运行: $0 enable"
|
||||
echo ""
|
||||
echo "========================================"
|
||||
}
|
||||
|
||||
# 主流程
|
||||
main() {
|
||||
local action=${1:-}
|
||||
|
||||
case "$action" in
|
||||
enable)
|
||||
enable_security
|
||||
;;
|
||||
disable)
|
||||
disable_security
|
||||
;;
|
||||
status)
|
||||
show_status
|
||||
;;
|
||||
*)
|
||||
show_usage
|
||||
;;
|
||||
esac
|
||||
}
|
||||
|
||||
# 执行主函数
|
||||
main
|
||||
main "$@"
|
||||
|
||||
Reference in New Issue
Block a user