务器版本：centos 6.8
openssh版本：openssh-7.5p1

1.升级openssl
wget https://www.openssl.org/source/openssl-1.0.2j.tar.gz
tar -xf openssl-1.0.2j.tar.gz
cd openssl-1.0.2j/ && ./config --prefix=/usr/local/openssl --openssldir=/usr/local/openssl --shared

yum install -y openssl-devel
make && make install

mv /usr/bin/openssl /usr/bin/openssl.OFF
mv /usr/include/openssl /usr/include/openssl.OFF
ln -s /usr/local/openssl/bin/openssl /usr/bin/openssl
ln -s /usr/local/openssl/include/openssl /usr/include/openssl
echo "/usr/local/openssl/lib">>/etc/ld.so.conf
ldconfig -v
echo 'export OPENSSL=/usr/local/openssl/bin' >>/etc/profile
echo 'export PATH=$OPENSSL:$PATH:$HOME/bin' >>/etc/profile
source /etc/profile
openssl version -a

2.升级openssh
wget https://mirrors.evowise.com/pub/OpenBSD/OpenSSH/portable/openssh-7.5p1.tar.gz
tar -xf openssh-7.5p1.tar.gz && cd openssh-7.5p1
yum install -y zlib-devel pam-devel tcp_wrappers-devel
./configure --prefix=/usr --sysconfdir=/etc/ssh --with-md5-passwords --with-pam --with-tcp-wrappers --with-ssl-dir=/usr/local/openssl
make && make install
ssh -V

#这一行为允许root账户登录echo 'PermitRootLogin yes' >> /etc/ssh/sshd_configservice sshd restart