Docker容器通信安全----TLS加密通讯

一、TLS加密通信

在公司的docker业务中，一般为了防止链路劫持、会话劫持等问题导致docker通信时
被中间人攻击，C/S两端应该通过加密方式通讯。

二、搭建部署

2.1、搭建环境

两台虚拟机都安装了 docker-ce。
server端-----192.168.100.136
client端------192.168.100.131

2.2、server端部署

//修改主机名
[root@localhost ~]# hostnamectl set-hostname master
[root@localhost ~]# su
//关闭防火墙
[root@master ~]# systemctl stop firewalld
[root@master ~]# mkdir /root/tls
[root@master ~]# cd /root/tls/

//创建ca密码----ca-key.pem
[root@master tls]# openssl genrsa -aes256 -out ca-key.pem 4096  #-aes256指密钥长度

//创建ca证书----ca.pem
[root@master tls]# openssl req -new -x509 -days 1000 -key ca-key.pem -sha256 -subj "/CN=*" -out ca.pem  
#-sha256 指哈希算法

//1、创建服务器私钥----server-key.pem
[root@master tls]# openssl genrsa -out server-key.pem 4096
Generating RSA private key, 4096 bit long modulus
......................++
...........................................................................................................................................++
e is 65537 (0x10001)
[root@master tls]# ls
ca-key.pem  ca.pem  server-key.pem

//2、创建私钥签名----server.csr
[root@master tls]# openssl req -subj "/CN=*" -sha256 -new -key server-key.pem -out server.csr
[root@master tls]# ls
ca-key.pem  ca.pem  server.csr  server-key.pem

//3、使用ca证书与私钥签名，创建server-cert.pem，生成ca.srl
[root@master tls]# openssl x509 -req -days 1000 -sha256 -in server.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out server-cert.pem
Signature ok
subject=/CN=*
Getting CA Private Key
Enter pass phrase for ca-key.pem:      #输入密码123123
[root@master tls]# ls
ca-key.pem  ca.pem  ca.srl  server-cert.pem  server.csr  server-key.pem

//生成客户端密钥----key.pem
[root@master tls]# openssl genrsa -out key.pem 4096
Generating RSA private key, 4096 bit long modulus
...........++
............................................++
e is 65537 (0x10001)
[root@localhost tls]# ls
ca-key.pem  ca.srl   server-cert.pem  server-key.pem
ca.pem      key.pem  server.csr

//生成客户端签名----client.csr
[root@master tls]# openssl req -subj "/CN=client" -new -key key.pem -out client.csr
[root@localhost tls]# ls
ca-key.pem  ca.srl      key.pem          server.csr
ca.pem      client.csr  server-cert.pem  server-key.pem

//创建配置文件----extfile.cnf
[root@master tls]# echo extendedKeyUsage=clientAuth > extfile.cnf
[root@localhost tls]# ls
ca-key.pem  ca.srl      extfile.cnf  server-cert.pem  server-key.pem
ca.pem      client.csr  key.pem      server.csr

//创建签名证书----cert.pem
[root@master tls]# openssl x509 -req -days 1000 -sha256 -in client.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out cert.pem -extfile extfile.cnf
Signature ok
subject=/CN=client
Getting CA Private Key
Enter pass phrase for ca-key.pem:     #输入密码123123
[root@localhost tls]# ls
ca-key.pem  ca.srl    client.csr   key.pem          server.csr
ca.pem      cert.pem  extfile.cnf  server-cert.pem  server-key.pem

//修改docker的配置文件，并且重启服务
[root@master tls]# vi /usr/lib/systemd/system/docker.service
#ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
ExecStart=/usr/bin/dockerd --tlsverify --tlscacert=/root/tls/ca.pem --tlscert=/root/tls/server-cert.pem --tlskey=/root/tls/server-key.pem -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock

[root@master tls]# systemctl daemon-reload
[root@master tls]# systemctl restart docker

将(ca.pem)ca证书、(cert.pem)签名证书、(key.pem)客户端密钥复制到client的/etc/docker目录下，使client客户端可以通过证书来访问

scp ca.pem [email protected]:/etc/docker/
scp cert.pem [email protected]:/etc/docker/
scp key.pem [email protected]:/etc/docker/

2.3client部署基本环境，且验证TLS

//更改主机名和hosts文件
[root@client ~]# hostnamectl set-hostname client
[root@client ~]# su
[root@client ~]# vi /etc/hosts
192.168.100.136 master
 
[root@client ~]# cd /etc/docker/
[root@client docker]# ls
ca.pem  cert.pem  daemon.json  key.json  key.pem

[root@client ~]# cd /etc/docker/        ##需要进入/etc/docker这个目录才可以执行下列命令
//查看server端的docker版本
[root@client docker]# docker --tlsverify --tlscacert=ca.pem --tlscert=cert.pem --tlskey=key.pem -H tcp://master:2375 version

//查看server端的images镜像
[root@client docker]# docker --tlsverify --tlscacert=ca.pem --tlscert=cert.pem --tlskey=key.pem -H tcp://master:2375 images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
nginx               latest              602e111c06b6        2 days ago          127MB