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Linux服务器安全配置攻略:打造企业级SSH安全防护

  • 2026-02-26 19:15:09
Linux服务器安全配置攻略:打造企业级SSH安全防护

在Linux运维管理中,SSH 作为远程登录与管理的核心入口,一旦被暴力破解、越权入侵,轻则数据泄露,重则服务瘫痪、业务中断。尤其对公网开放的 Linux 服务器更是如此

本文整理一套适合生产环境的 SSH 安全加固方案,覆盖端口、认证、权限、访问控制等关键环节,帮你快速搭建一套企业级安全防护体系。

一、修改默认端口

SSH 默认端口 22 是全网扫描器的 “首选目标”,使用默认端口,几乎等于主动暴露攻击面。

1. 修改 SSH 配置

vi /etc/ssh/sshd_config
找到以下配置并修改:
# 取消注释,修改为自定义端口(建议 10000–65535 之间)Port 22345
2. 重启 SSH 服务
systemctl restart sshd
注意:修改端口后,务必先在当前窗口保持连接,新开窗口测试登录,确认成功再关闭旧连接,避免被锁在服务器外。后续对配置文件的修改遵循同样的原则。建议在所有更改完成前,始终保持初始登录窗口不要关闭。
对于ubuntu 22.10及以后的系统,服务ssh.socket接管了ssh服务器的监听。此时直接修改配置文件无效。此时需要先停用ssh.socket服务:
systemctl stop ssh.socketsystemctl disable ssh.socketsystemctl restart sshd

二、禁用 root 直接登录:最小权限原则

root 账号权限无上限。因此需要禁止root远程SSH登录。

1. 禁止 root 登录

vi /etc/ssh/sshd_config
修改如下配置行:
PermitRootLogin no
2. 创建普通运维账号,加入sudo组
useradd adminpasswd adminusermod -aG sudo admin
三、使用密钥登录,关闭密码认证
1. Linux 服务器端创建 .ssh 目录
su - adminmkdir -p ~/.sshchmod 700 ~/.sshtouch 
2. Windows 端用 PuTTYgen 生成密钥对
  1.     打开 PuTTYgen(PuTTY 自带工具)
  2.     下方参数选择:
    •         Type of key to generate: RSA
    •         Number of bits: 2048 及以上(推荐 4096)
  3.     点击 Generate,随机移动鼠标生成熵值
  4.     生成完成后:
    •         Key passphrase 设置密钥密码(不要与用户密码相同)
      •     点击 Save private key,保存 .ppk 私钥(密钥文件,不要泄露)
      • 3. 把公钥传到 Linux 服务器

        在 PuTTYgen 上方,复制完整的公钥字符串(ssh-rsa 开头那一段)。回到服务器:

vi ~/.ssh/authorized_keys
把复制的公钥粘贴进去,然后设置权限:
chmod 600 ~/.ssh/authorized_keys
4. ssh服务器启用密钥登录、关闭密码登录
vi /etc/ssh/sshd_config
修改:
PasswordAuthentication noPubkeyAuthentication yes
重启 SSH:
systemctl restart sshd
5. PuTTY 配置密钥登录
  1. 打开 PuTTY;
  2. Host Name 填写 IP,Port 填写你修改后的端口;
  3. 左侧菜单:Connection → SSH → Auth;
  4. 点击 Browse,选择你保存的 .ppk 私钥;
  5. 返回 Session,保存配置,点击 Open 登录;

如果设置了密钥密码,会提示输入密钥密码。

四、结语

SSH 是 Linux 服务器的 “大门”,一套规范的 SSH 配置,能挡住 90% 以上的自动化入侵。

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  1. CONNECT:[ UseTime:0.000362s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000545s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000298s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000296s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000646s ]
  6. SELECT * FROM `set` [ RunTime:0.000239s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000753s ]
  8. SELECT * FROM `article` WHERE `id` = 475942 LIMIT 1 [ RunTime:0.000462s ]
  9. UPDATE `article` SET `lasttime` = 1772318792 WHERE `id` = 475942 [ RunTime:0.001038s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000284s ]
  11. SELECT * FROM `article` WHERE `id` < 475942 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000994s ]
  12. SELECT * FROM `article` WHERE `id` > 475942 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000482s ]
  13. SELECT * FROM `article` WHERE `id` < 475942 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001224s ]
  14. SELECT * FROM `article` WHERE `id` < 475942 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001050s ]
  15. SELECT * FROM `article` WHERE `id` < 475942 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000756s ]
0.089440s