Ubuntu进行openssh漏洞修复，升级openssh8.1

Ubuntu16.04默认的openssh是7.2p2版的，存在有很多安全漏洞，所以计划升级至8.1p1

前期准备

1. 卸载原有的ssh
2. 安装依赖库
3. 安装数据压缩用的函式库zlib
4. 安装openssl
5. 安装openssh

openssh8.1的下载地址

查看当前版本

1卸载Openssh Openssl

service sshd stop
apt purge openssl
apt purge ssh

2安装依赖包

apt install libzip-dev libssl-dev autoconf gcc libxml2 make

3编译安装zlib

wget http://www.zlib.net/zlib-1.2.11.tar.gz
tar -zxvf zlib-1.2.11.tar.gz
cd zlib-1.2.11
./configure --prefix=/usr/local
make
make install

4编译安装openssl

wget https://www.openssl.org/source/openssl-1.1.1.tar.gz --no-check-certificate
tar -zxvf openssl-1.1.1.tar.gz
cd openssl-1.1.1
./config shared --prefix=/usr/local/ssl
make test
make install
ln -s /usr/local/ssl/lib/libssl.so.1.1 /usr/lib/libssl.so.1.1
ln -s /usr/local/ssl/lib/libcrypto.so.1.1 /usr/lib/libcrypto.so.1.1

5编译安装openssh

wget http://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-8.1p1.tar.gz
tar -zxvf openssh-8.1p1.tar.gz
cd openssh-8.1p1
./configure --prefix=/usr/local --sysconfdir=/etc/ssh --with-ssl-dir=/usr/local/ssl
make
make install

6设置相关配置文件

mv /usr/bin/scp /tmp/;mv /usr/bin/ssh* /tmp/
ln -s /usr/local/bin/ssh /usr/bin/ssh
ln -s /usr/local/bin/scp /usr/bin/scp
ln -s /usr/local/bin/ssh-add /usr/bin/ssh-add
ln -s /usr/local/bin/ssh-agent /usr/bin/ssh-agent
ln -s /usr/local/bin/ssh-keygen /usr/bin/ssh-keygen
ln -s /usr/local/bin/ssh-keyscan /usr/bin/ssh-keyscan
ln -s /usr/local/bin/openssl /usr/bin/openssl
ln -s /usr/local/sbin/sshd /usr/bin/sshd

7重启ssh服务

service sshd restart

8查看当前版本

ssh -V
sshd -V