使用TLS加密通讯远程连接Docker的示例详解

# 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]#

[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