隐藏ssh的banner信息

1.需要修改ssh源文件 version.h 中 define SSH_VERSION的内容

#define SSH_VERSION     "OpenSSH_Welcome"

#define SSH_PORTABLE    "p1"
#define SSH_RELEASE     SSH_VERSION SSH_PORTABLE

2.编译源码安装Openssh
3.重启sshd服务

$ systemctl daemon-reload
$ systemctl restart sshd.service

4.验证是否成功

$ telnet localhost 22
Trying ::1...
Connected to localhost.
Escape character is '^]'.
SSH-2.0-OpenSSH_Welcome