操作系统版本 : CentOS 7.9
OpenSSH版本 : 7.4p1  升级至 OpenSSH 9.8p1
OpenSSL版本 : 1.0.2k 升级至 OpenSSL 3.3.1

#下载安装包
cd /usr/local/src
https://www.zlib.net/zlib-1.3.1.tar.gz
https://www.openssl.org/source/openssl-3.3.1.tar.gz
https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-9.8p1.tar.gz

tar -zxf openssh-9.8p1.tar.gz && tar -zxf openssl-3.3.1.tar.gz && tar -zxf zlib-1.3.1.tar.gz

#备份文件
cp -rf /etc/ssh /etc/ssh.20240704
cp -rf /usr/bin/openssl /usr/bin/openssl.20240704
cp -rf /etc/pam.d /etc/pam.d.20240704
cp -rf /usr/lib/systemd/system /system.20240704

#安装telnet
yum install -y telnet telnet-server xinetd
systemctl start xinetd
systemctl start telnet.socket
sed -i 's/^auth[[:space:]]\+required[[:space:]]\+pam_securetty.so/#&/' /etc/pam.d/remote
telnet ip
systemctl enable telnet.socket

#安装依赖
yum install -y perl-CPAN perl-IPC-Cmd pam-devel

#安装zlib
cd /usr/local/src/zlib-1.3.1
./configure --prefix=/usr/local/src/zlib
make -j 4 && make install

#安装openssl
cd /usr/local/src/openssl-3.3.1
./config --prefix=/usr/local/src/openssl
make -j 4 && make install

rm -f /usr/bin/openssl
ln -s /usr/local/src/openssl/bin/openssl /usr/bin/openssl
ln -s /usr/local/src/openssl/lib64/libssl.so.3 /usr/lib64/libssl.so.3
ln -s /usr/local/src/openssl/lib64/libcrypto.so.3 /usr/lib64/libcrypto.so.3

echo "/usr/local/src/openssl/lib64" >> /etc/ld.so.conf
ldconfig
openssl version -v

#卸载旧版openssh
yum remove -y openssh
rm -rf /etc/ssh/*

#安装新版openssh
cd /usr/local/src/openssh-9.8p1
./configure --prefix=/usr/local/src/ssh --sysconfdir=/etc/ssh --with-pam --with-ssl-dir=/usr/local/src/openssl --with-zlib=/usr/local/src/zlib
make -j 4 && make install

cp -rf /usr/local/src/openssh-9.8p1/contrib/redhat/sshd.init /etc/init.d/sshd
cp -rf /usr/local/src/openssh-9.8p1/contrib/redhat/sshd.pam /etc/pam.d/sshd
cp -rf /usr/local/src/ssh/sbin/sshd /usr/sbin/sshd
cp -rf /usr/local/src/ssh/bin/ssh /usr/bin/ssh
cp -rf /usr/local/src/ssh/bin/ssh-keygen /usr/bin/ssh-keygen
cp -rf /usr/local/src/ssh/bin/scp /usr/bin/scp
cp -rf /usr/local/src/ssh/bin/sftp /usr/bin/sftp
cp -rf /usr/local/src/ssh/bin/ssh-add /usr/bin/ssh-add

#修改配置
echo 'PermitRootLogin yes' >> /etc/ssh/sshd_config
echo 'PasswordAuthentication yes' >> /etc/ssh/sshd_config

/etc/init.d/sshd restart
/etc/init.d/sshd status
chkconfig --add sshd
ssh -V

#关闭telnet
systemctl disable telnet.socket
systemctl stop telnet.socket
systemctl status telnet.socket

systemctl status xinetd
systemctl list-unit-files |grep telnet

注意：升级完成后若 UsePAM yes 则会登录失败，此时我们还原升级前的/etc/pam.d/sshd 即可
cp -p /etc/pam.d/sshd /etc/pam.d/sshd.new
cp -p /etc/ssh/sshd_config /etc/ssh/sshd_config.new

\cp -p /etc/ssh.20240704/sshd_config /etc/ssh/sshd_config
\cp -p /etc/pam.d.20240704/sshd /etc/pam.d/sshd

#检查配置文件
/usr/local/src/ssh/sbin/sshd -t -f /etc/ssh/sshd_config

/usr/local/src/ssh/sbin/sshd -T