ssh 登录验证：使用公钥登录和谷歌认证
server 端 配置文件
Port 3208 Protocol 2 ListenAddress 0.0.0.0 SyslogFacility AUTHPRIV RSAAuthentication yes PubkeyAuthentication yes PermitRootLogin no PermitEmptyPasswords no PasswordAuthentication yes ChallengeResponseAuthentication no GSSAPIAuthentication no #是否在用户退出登录后自动销毁用户凭证缓存 GSSAPICleanupCredentials yes UsePAM yes AcceptEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES AcceptEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT AcceptEnv LC_IDENTIFICATION LC_ALL X11Forwarding no UseDNS no ClientAliveInterval 60 Subsystem sftp /usr/libexec/openssh/sftp-server
client 端配置文件
Port 3208 Protocol 2 ListenAddress ip SyslogFacility AUTHPRIV PermitRootLogin no PermitEmptyPasswords no PasswordAuthentication yes ChallengeResponseAuthentication no GSSAPIAuthentication no GSSAPICleanupCredentials yes UsePAM yes AcceptEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES AcceptEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT AcceptEnv LC_IDENTIFICATION LC_ALL X11Forwarding no UseDNS no ClientAliveInterval 60 Subsystem sftp /usr/libexec/openssh/sftp-server
1.生成公钥与私钥
ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key (/home/client/.ssh/id_rsa): #此处直接按回车即可 Created directory '/home/client/.ssh'. Enter passphrase (empty for no passphrase): #此处直接按回车即可 Enter same passphrase again: #此处直接按回车即可 Your identification has been saved in /home/client/.ssh/id_rsa. Your public key has been saved in /home/client/.ssh/id_rsa.pub
2. 将公钥文件追加到server端用户目录的./ssh/authorized_keys中 ，.ssh目录权限必须是0700
cat id_rsa.pub >> authorized_keys chmod 600 authorized_keys
3.server 端 和client 端 无密码登录
scp ./id_rsa.pub sweet@192.168.1.101:/home/client/.ssh/authorized_keys #注意一下目标机的authorized_keys的权限是-rw-r--r--，如果不是需要执行chmod 644 authorized_keys修改文件的权限
谷歌验证器
安装GOOGLE-AUTHENTICATOR验证器 1.安装epel源 rpm -ivh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm 2.安装git级二维码工具 yum install -y git qrencode 3.安装开发包工具 yum groupinstall -y "Development Tools" pam-devel 4.安装google-authenticator git clone https://github.com/google/google-authenticator.git cd google-authenticator/libpam/ sh bootstrap.sh ./configure && make && make install cp -v /usr/local/lib/security/pam_google_authenticator.so /lib64/security/ 5.生成基于计数的认证token（可以忽略时间错误） google-authenticator（n,y,y,y） 6.更改ssh级pam设置 ## 修改PAM vi /etc/pam.d/sshd auth required pam_google_authenticator.so ## 修改SSH配置 ChallengeResponseAuthentication yes UsePAM yes service sshd restart 修改ssh的鉴权方式，改为键盘交互。 注意： 这里要把应急验证码记录下，防止验证坏掉以后无法登陆，也可以把ssh的公钥下载下来做备用登陆方式
