系统环境：# lsb_release -a
Distributor ID: Ubuntu
Description: Ubuntu 16.04.4 LTS
Release: 16.04
Codename: xenial
之前默认的openssh版本：# ssh -V
OpenSSH_7.2p2 Ubuntu-4ubuntu2.8, OpenSSL 1.0.2g 1 Mar 2016
=============== 碰到的问题 ===============
1. curl www.baidu.com
curl: (77) Problem with the SSL CA cert (path? access rights?)
2. 其实就是相当于安装一个新的/usr/local/bin/，就是都还在/usr/bin/
1.下载源码文件压缩包
wget http://www.zlib.net/zlib-1.2.11.tar.gz
wget https://www.openssl.org/source/openssl-1.1.1b.tar.gz
wget https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-7.9p1.tar.gz
------------- 解压 -------------
tar zxvf zlib-1.2.11.tar.gz
tar zxvf openssl-1.1.1b.tar.gz
tar zxvf openssh-7.9p1.tar.gz
2.编译安装zlib
cd zlib-1.2.11/
./configure --prefix=/usr/local
make
sudo make install
3.看情况卸载旧的openssl
注：是否不需要卸载旧的openssl，因为装完新的之后会有SSL CA的问题，或者其他问题
curl: (77) Problem with the SSL CA cert (path? access rights?)
这个问题重新装回来就好了
sudo apt install ca-certificates
测试过不需要卸载旧的，最后是新的/usr/local/bin/和旧的/usr/bin/共存
------ 卸载旧的openssl ------
apt-get purge openssl
4.编译安装openssl
cd openssl-1.1.1b/
./config shared --prefix=/usr/local --openssldir=/usr/local/ssl
make
sudo make install
sudo ln -s /usr/local/lib/libssl.so.1.1 /usr/lib/libssl.so.1.1
sudo ln -s /usr/local/lib/libcrypto.so.1.1 /usr/lib/libcrypto.so.1.1
------------------------------------------------
这时候就可以查看openssl版本：openssl version -a
OpenSSL 1.1.1b 26 Feb 2019
built on: Fri Apr 19 08:19:20 2019 UTC
platform: linux-x86_64
......
------------------------------------------------
5.编译安装openssh
注：如果./configure失败，可以先执行下面两个命令再试试
echo "/usr/local/ssl/lib" >> /etc/ld.so.conf
ldconfig
后面再测试不需要这个步骤，是因为原来的-with-ssl-dir=/usr/local/ssl，去掉ssl就可以了
--------------------------------------------------------------------------------
cd openssh-7.9p1/
./configure -prefix=/usr/local -sysconfdir=/etc/ssh -with-ssl-dir=/usr/local
make
sudo make install
-------------------------------------------
至此，所有都升级完成，可以查看ssh的版本：ssh -V
OpenSSH_7.9p1, OpenSSL 1.1.1b 26 Feb 2019
6.看需要设置相关配置文件
升级完成后，用的命令都是在/usr/local/bin/目录下，可以用：which ssh 试看看哟
/usr/local/bin/ssh
----------------- 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
/etc/init.d/ssh restart
如果没有开启过ssh可以看第二个链接【Ubuntu 16.04开启SSH服务】
可以测试连接自己的
ssh your_username@your_host
参考链接：
https://www.jianshu.com/p/9dc0e7c8faca
https://blog.csdn.net/woaiyaou/article/details/78360382