1.前言
Hello大家好我是哈皮，最近项目中被报告低版本SSH存在漏洞，需要进行升级（升级到目前最新的8.8版本），记录一下升级过程。
2.资源
https://github.com/openssh/openssh-portable/tags
https://github.com/openssl/openssl/tags
https://github.com/happyjava007/share/raw/main/openssh-8.8p1.tar.gz
https://github.com/happyjava007/share/raw/main/openssl-3.0.1.tar.gz
3.开启Telnet登陆
为了避免升级失败，导致无法登陆服务器，所以需要开启Telnet登陆。
systemctl start telnet.socket
telnet 127.0.0.1 # 测试是否可以正常登陆
4.升级OpenSSL
mv /usr/bin/openssl /usr/bin/openssl_old
进入OpenSSL源码目录./config shared && make && make install
检查安装openssl version
报错 openssl: error while loading shared libraries: libssl.so.3: cannot open shared object file: No such file or directory 在OpenSSL源码目录cp libssl.so.3 /usr/lib64/
cp libcrypto.so.3 /usr/lib64/
5.升级OpenSSH
mkdir /etc/ssh_old
mv /etc/ssh/* /etc/ssh_old/
./configure --prefix=/usr/ --sysconfdir=/etc/ssh --with-ssl-dir=/usr/local/lib64/ --with-zlib --with-pam --with-md5-password --with-ssl-engine --with-selinux
警告PAM is enabled. You may need to install a PAM control file
for sshd, otherwise password authentication may fail.
Example PAM control files can be found in the contrib/
subdirectory
ls contrib # 里面有各种系统
备份mv /etc/pam.d/sshd /etc/pam.d/sshd_bak
复制cp contrib/redhat/sshd.pam /etc/pam.d/sshd # 根据系统选择
安装make && make install
根据提示执行/usr/sbin/sshd -t -f /etc/ssh/sshd_config
vim /etc/ssh/sshd_config
PermitRootLogin yes # 开启root登陆
mv /usr/lib/systemd/system/sshd.service /etc/ssh_old/
mv /usr/lib/systemd/system/sshd.socket /etc/ssh_old/
cp -a contrib/redhat/sshd.init /etc/init.d/sshd
systemctl daemon-reload
systemctl restart sshd
升级完后，ssh登陆可能报错
Host key verification failed.
执行以下命令即可
ssh-keygen -R
