使用TLS加密通讯远程连接Docker的示例详解

默认情况下，Docker 通过非联网 UNIX 套接字运行。它还可以使用 HTTP 套接字进行可选通信。

如果需要以安全的方式通过网络访问 Docker，可以通过指定标志将 Docker 标志指向受信任的 CA 证书来启用 TLS。

在守护程序模式下，它只允许来自由该 CA 签名的证书验证的客户端的连接。在客户端模式下，它仅连接到具有该 CA 签名的证书的服务器。# 创建CA证书目录 [root@localhost ~]# mkdir tls [root@localhost ~]# cd tls/ # 创建CA密钥 [root@localhost tls]# openssl genrsa -aes256 -out ca-key.pem 4096 Generating RSA private key, 4096 bit long modulus ……………………………………………………………………++ …………………………………………………………………………………………………………………………………………………++ e is 65537 (0x10001) Enter pass phrase for ca-key.pem: Verifying – Enter pass phrase for ca-key.pem: # 创建CA证书 [root@localhost tls]# openssl req -new -x509 -days 1000 -key ca-key.pem -sha256 -subj “/CN=*” -out ca.pem Enter pass phrase for ca-key.pem: [root@localhost tls]# ll 总用量 8 -rw-r–r–. 1 root root 3326 12月 3 17:20 ca-key.pem -rw-r–r–. 1 root root 1765 12月 3 19:03 ca.pem # 创建服务器私钥 [root@localhost tls]# openssl genrsa -out server-key.pem 4096 Generating RSA private key, 4096 bit long modulus ……………………………………………………….++ ………………++ e is 65537 (0x10001) [root@localhost tls]# ll 总用量 12 -rw-r–r–. 1 root root 3326 12月 3 17:20 ca-key.pem -rw-r–r–. 1 root root 1765 12月 3 19:03 ca.pem -rw-r–r–. 1 root root 3243 12月 3 19:03 server-key.pem # 对私钥进行签名 [root@localhost tls]# openssl req -subj “/CN=*” -sha256 -new -key server-key.pem -out server.csr [root@localhost tls]# ll 总用量 16 -rw-r–r–. 1 root root 3326 12月 3 17:20 ca-key.pem -rw-r–r–. 1 root root 1765 12月 3 19:03 ca.pem -rw-r–r–. 1 root root 1574 12月 3 19:04 server.csr -rw-r–r–. 1 root root 3243 12月 3 19:03 server-key.pem 使用CA证书与私钥签名，输入上面设置的密码 [root@localhost 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: #生成客户端密钥 [root@localhost tls]# openssl genrsa -out key.pem 4096 Generating RSA private key, 4096 bit long modulus ……………………………………………………………………………………………………..++ ……………………………++ e is 65537 (0x10001) #对客户端签名 [root@localhost tls]# openssl req -subj “/CN=client” -new -key key.pem -out client.csr #创建配置文件 [root@localhost tls]# echo extendedKeyUsage=clientAuth > extfile.cnf #签名证书 [root@localhost 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: [root@localhost tls]# ll 总用量 40 -rw-r–r–. 1 root root 3326 12月 3 17:20 ca-key.pem -rw-r–r–. 1 root root 1765 12月 3 19:03 ca.pem -rw-r–r–. 1 root root 17 12月 3 19:35 ca.srl -rw-r–r–. 1 root root 1696 12月 3 19:35 cert.pem -rw-r–r–. 1 root root 1582 12月 3 19:29 client.csr -rw-r–r–. 1 root root 28 12月 3 19:32 extfile.cnf -rw-r–r–. 1 root root 3243 12月 3 19:08 key.pem -rw-r–r–. 1 root root 1647 12月 3 19:08 server-cert.pem -rw-r–r–. 1 root root 1574 12月 3 19:04 server.csr -rw-r–r–. 1 root root 3243 12月 3 19:03 server-key.pem # 删除多余文件 [root@localhost tls]#

在客户端测试

[root@client ~]# docker –tlsverify –tlscacert=ca.pem –tlscert=cert.pem –tlskey=key.pem -H tcp://master:2376 version Client: Docker Engine – Community Version: 19.03.13 API version: 1.40 Go version: go1.13.15 Git commit: 4484c46d9d Built: Wed Sep 16 17:03:45 2020 OS/Arch: linux/amd64 Experimental: false Server: Docker Engine – Community Engine: Version: 19.03.13 API version: 1.40 (minimum version 1.12) Go version: go1.13.15 Git commit: 4484c46d9d Built: Wed Sep 16 17:02:21 2020 OS/Arch: linux/amd64 Experimental: false containerd: Version: 1.3.9 GitCommit: ea765aba0d05254012b0b9e595e995c09186427f runc: Version: 1.0.0-rc10 GitCommit: dc9208a3303feef5b3839f4323d9beb36df0a9dd docker-init: Version: 0.18.0 GitCommit: fec3683