前言
之前開啟了docker的2375 Remote API，接到公司安全部門的要求，需要啟用授權(quán)，翻了下官方文檔
Protect the Docker daemon socket
啟用TLS
在docker服務(wù)器，生成CA私有和公共密鑰
$ 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:
$ openssl req -new -x509 -days 365 -key ca-key.pem -sha256 -out ca.pem
Enter pass phrase for ca-key.pem:
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [AU]:
State or Province Name (full name) [Some-State]:Queensland
Locality Name (eg, city) []:Brisbane
Organization Name (eg, company) [Internet Widgits Pty Ltd]:Docker Inc
Organizational Unit Name (eg, section) []:Sales
Common Name (e.g. server FQDN or YOUR name) []:$HOST
Email Address []:Sven@home.org.au
有了CA后，可以創(chuàng)建一個服務(wù)器密鑰和證書簽名請求(CSR)
$HOST 是你的服務(wù)器ip
$ openssl genrsa -out server-key.pem 4096
Generating RSA private key, 4096 bit long modulus
.....................................................................++
.................................................................................................++
e is 65537 (0x10001)
$ openssl req -subj "/CN=$HOST" -sha256 -new -key server-key.pem -out server.csr
接著，用CA來簽署公共密鑰:
$ echo subjectAltName = DNS:$HOST,IP:$HOST:127.0.0.1 >> extfile.cnf
$ echo extendedKeyUsage = serverAuth >> extfile.cnf
生成key：
$ openssl x509 -req -days 365 -sha256 -in server.csr -CA ca.pem -CAkey ca-key.pem \
-CAcreateserial -out server-cert.pem -extfile extfile.cnf
Signature ok
subject=/CN=your.host.com
Getting CA Private Key
Enter pass phrase for ca-key.pem:
創(chuàng)建客戶端密鑰和證書簽名請求:
$ openssl genrsa -out key.pem 4096
Generating RSA private key, 4096 bit long modulus
.........................................................++
................++
e is 65537 (0x10001)
$ openssl req -subj '/CN=client' -new -key key.pem -out client.csr
修改extfile.cnf：
echo extendedKeyUsage = clientAuth > extfile-client.cnf
生成簽名私鑰：
$ openssl x509 -req -days 365 -sha256 -in client.csr -CA ca.pem -CAkey ca-key.pem \
-CAcreateserial -out cert.pem -extfile extfile-client.cnf
Signature ok
subject=/CN=client
Getting CA Private Key
Enter pass phrase for ca-key.pem:
將Docker服務(wù)停止，然后修改docker服務(wù)文件
[Unit]
Description=Docker Application Container Engine
Documentation=http://docs.docker.io
[Service]
Environment="PATH=/opt/kube/bin:/bin:/sbin:/usr/bin:/usr/sbin"
ExecStart=/opt/kube/bin/dockerd --tlsverify --tlscacert=/root/docker/ca.pem --tlscert=/root/docker/server-cert.pem --tlskey=/root/docker/server-key.pem -H unix:///var/run/docker.sock -H tcp://0.0.0.0:2375
ExecStartPost=/sbin/iptables -I FORWARD -s 0.0.0.0/0 -j ACCEPT
ExecReload=/bin/kill -s HUP $MAINPID
Restart=on-failure
RestartSec=5
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
Delegate=yes
KillMode=process
[Install]
WantedBy=multi-user.target
然后重啟服務(wù)
systemctl daemon-reload
systemctl restart docker.service
重啟后查看服務(wù)狀態(tài)：
systemctl status docker.service
● docker.service - Docker Application Container Engine
Loaded: loaded (/etc/systemd/system/docker.service; enabled; vendor preset: enabled)
Active: active (running) since Thu 2019-08-08 19:22:26 CST; 1 min ago
已經(jīng)生效。
使用證書連接：
復(fù)制ca.pem,cert.pem,key.pem三個文件到客戶端
docker --tlsverify --tlscacert=ca.pem --tlscert=cert.pem --tlskey=key.pem -H=$HOST:2375 version連接即可
docker-java 啟用TLS
項目里使用docker的java客戶端docker-java調(diào)用docker，為了支持TLS，在創(chuàng)建客戶端時，需要增加TLS設(shè)置。
首先將ca.pem cert.pem key.pem這三個文件拷貝到本地，例如E:\\docker\\",
然后DefaultDockerClientConfig里withDockerTlsVerify設(shè)為true，并設(shè)置certpath為剛拷貝的目錄。
DefaultDockerClientConfig.Builder builder =
DefaultDockerClientConfig.createDefaultConfigBuilder()
.withDockerHost("tcp://" + server + ":2375")
.withApiVersion("1.30");
if (containerConfiguration.getDockerTlsVerify()) {
builder = builder.withDockerTlsVerify(true)
.withDockerCertPath("E:\\docker\\");
}
return DockerClientBuilder.getInstance(builder.build()).build()
大工搞定。
總結(jié)
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