Linux 编译安装 OpenSSH

1. 安装依赖

yum -y install gcc openssl11 openssl11-devel pam-devel zlib-devel

2. 设置编译 FLAG

export CFLAGS=$(pkg-config --cflags libssl11)
export LDFLAGS=$(pkg-config --libs libssl11)

3. 备份配置，删除系统自带软件包

mv /etc/pam.d/sshd /etc/pam.d/sshd.bak
rpm -e --nodeps $(rpm -qa | grep openssh)
rm -rf /etc/ssh/*

4. 下载源码包，编译安装

cd src
wget https://mirrors.aliyun.com/pub/OpenBSD/OpenSSH/portable/openssh-9.3p1.tar.gz
tar xf openssh-9.3p1.tar.gz
cd openssh-9.3p1
./configure --prefix=/usr --sysconfdir=/etc/ssh --with-pam --with-zlib
make -j$(nproc)
make install

5. 修改服务端和客户端配置，支持 RSA 密钥

cat >> /etc/ssh/sshd_config << EOF
PubkeyAcceptedAlgorithms=+ssh-rsa
UseDNS no
UsePAM yes
EOF

echo 'PubkeyAcceptedKeyTypes +ssh-rsa' >> /etc/ssh/ssh_config

注意事项：如华为云、阿里云、腾讯云等使用 root 用户登录云主机的系统，需要执行此操作，否则可以免去以下步骤

echo 'PermitRootLogin yes' >> /etc/ssh/sshd_config

6. 还原配置，添加启动服务

mv /etc/pam.d/sshd.bak /etc/pam.d/sshd
cp contrib/redhat/sshd.init /etc/init.d/sshd
chkconfig --add sshd
chkconfig sshd on
systemctl daemon-reload
systemctl restart sshd