如何限制SSH用户的访问权限

限制SSH用户的访问权限是提高系统安全性的重要措施。以下是一些常见的方法来限制SSH用户的访问权限：

1. 使用 sshd_config 文件

编辑 /etc/ssh/sshd_config 文件，可以全局或针对特定用户进行配置。

全局配置

• 限制登录用户：

  AllowUsers user1 user2 user3
  

  这将只允许 user1, user2, 和 user3 用户通过SSH登录。

• 限制登录组：

  AllowGroups group1 group2
  

  这将只允许属于 group1 和 group2 组的用户通过SSH登录。

• 禁止root登录：

  PermitRootLogin no
  

• 限制登录时间：

  Match User user1
      ForceCommand internal-sftp
      PasswordAuthentication no
      PermitRootLogin no
      AllowTcpForwarding no
      X11Forwarding no
      PermitTTY no
      AllowAgentForwarding no
      PermitOpen any
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForwarding yes
      AllowAgentForwarding yes
      AllowX11Forwarding yes
      PermitTTY yes
      AllowStreamLocalCommand yes
      AllowTcpForward