之前有很多朋友提过,当使用
docker-maven-plugin
打包SpringBoot应用的Docker镜像时,服务器需要开放2375
端口。由于开放了端口没有做任何安全保护,会引起安全漏洞,被人入侵、挖矿、CPU飙升这些情况都有发生,今天我们来聊聊如何解决这个问题。
首先我们要明白问题产生的原因,才能更好地解决问题!
Docker为了实现集群管理,提供了远程管理的端口。Docker Daemon作为守护进程运行在后台,可以执行发送到管理端口上的Docker命令。
当我们修改docker.service
文件,修改启动命令,加入-H tcp://0.0.0.0:2375
时,就会开放2375
端口,且没有任何加密和认证过程,这种方式一般用在内网测试环境。如果你的服务器部署在公网上,任何知道你IP的人,都可以管理这台主机上的容器和镜像,想想就觉得可怕。
开放远程管理端口后,没有做任何安全保护导致了这个问题。我们只要使用安全传输层协议(TLS)进行传输并使用CA认证即可。
我们需要使用OpenSSL制作CA机构证书、服务端证书和客户端证书,以下操作均在安装Docker的Linux服务器上进行。
mkdir /mydata/docker-ca && cd /mydata/docker-ca
ca-key.pem
;openssl genrsa -aes256 -out ca-key.pem 4096
ca.pem
;openssl req -new -x509 -days 365 -key ca-key.pem -sha256 -subj "/CN=*" -out ca.pem
server-key.pem
;openssl genrsa -out server-key.pem 4096
server.csr
;openssl req -subj "/CN=*" -sha256 -new -key server-key.pem -out server.csr
server-cert.pem
;openssl x509 -req -days 365 -sha256 -in server.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out server-cert.pem
key.pem
;openssl genrsa -out key.pem 4096
client.csr
;openssl req -subj "/CN=client" -new -key key.pem -out client.csr
extfile-client.cnf
;echo extendedKeyUsage = clientAuth > extfile-client.cnf
cert.pem
;openssl x509 -req -days 365 -sha256 -in client.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out cert.pem -extfile extfile-client.cnf
rm -rf ca.srl server.csr client.csr extfile-client.cnf
ca.pem CA证书
ca-key.pem CA证书私钥
server-cert.pem 服务端证书
server-key.pem 服务端证书私钥
cert.pem 客户端证书
key.pem 客户端证书私钥
vi /usr/lib/systemd/system/docker.service
ExecStart
开头的配置,开启TLS认证,并配置好CA证书、服务端证书和服务端私钥,修改内容如下;ExecStart=/usr/bin/dockerd -H fd:// -H tcp://0.0.0.0:2375 --tlsverify --tlscacert=/mydata/docker-ca/ca.pem --tlscert=/mydata/docker-ca/server-cert.pem --tlskey=/mydata/docker-ca/server-key.pem
systemctl daemon-reload && systemctl restart docker
接下来我们将使用
docker-maven-plugin
来打包Docker镜像,使用的代码为原来的mall-tiny-docker
例子。
docker-maven-plugin
打包试试,由于我们的插件版本有点低,使用新一点版本的Docker会出现如下问题,升级到1.2.2
版本解决该问题;[ERROR] Failed to execute goal com.spotify:docker-maven-plugin:1.1.0:build (build-image) on project mall-tiny-docker: Exception caught: com.spotify.docker.client.shaded.com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `com.spotify.docker.client.messages.RegistryAuth` (although at least one Creator exists): no String-argument constructor/factory method to deserialize from String value ('desktop')
[ERROR] at [Source: UNKNOWN; line: -1, column: -1] (through reference chain: java.util.LinkedHashMap["credsStore"])
[ERROR] -> [Help 1]
http
了,需要改用https
,修改<dockerHost>
配置为https
;[ERROR] Failed to execute goal com.spotify:docker-maven-plugin:1.2.2:build (build-image) on project mall-tiny-docker: Exception caught: Request error: GET http://192.168.3.101:2375/version: 400, body: Client sent an HTTP request to an HTTPS server. HTTP 400 Bad Request -> [Help 1]
[ERROR] Failed to execute goal com.spotify:docker-maven-plugin:1.2.2:build (build-image) on project mall-tiny-docker: Exception caught: java.util.concurrent.ExecutionException: com.spotify.docker.client.shaded.javax.ws.rs.ProcessingException: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target -> [Help 1]
I:\developer\env\docker-ca
;ca.pem CA证书
cert.pem 客户端证书
key.pem 客户端证书私钥
<dockerCertPath>
节点下,最终插件配置如下;<plugin>
<groupId>com.spotify</groupId>
<artifactId>docker-maven-plugin</artifactId>
<version>1.2.2</version>
<executions>
<execution>
<id>build-image</id>
<phase>package</phase>
<goals>
<goal>build</goal>
</goals>
</execution>
</executions>
<configuration>
<imageName>mall-tiny/${project.artifactId}:${project.version}</imageName>
<dockerHost>https://192.168.3.101:2375</dockerHost>
<baseImage>java:8</baseImage>
<entryPoint>["java", "-jar","/${project.build.finalName}.jar"]
</entryPoint>
<dockerCertPath>I:\developer\env\docker-ca</dockerCertPath>
<resources>
<resource>
<targetPath>/</targetPath>
<directory>${project.build.directory}</directory>
<include>${project.build.finalName}.jar</include>
</resource>
</resources>
</configuration>
</plugin>
2375
端口终于可以安全使用了![INFO] Building image mall-tiny/mall-tiny-docker:0.0.1-SNAPSHOT
Step 1/3 : FROM java:8
---> d23bdf5b1b1b
Step 2/3 : ADD /mall-tiny-docker-0.0.1-SNAPSHOT.jar //
---> 5cb5a64ccedd
Step 3/3 : ENTRYPOINT ["java", "-jar","/mall-tiny-docker-0.0.1-SNAPSHOT.jar"]
---> Running in 5f3ceefdd974
Removing intermediate container 5f3ceefdd974
---> ee9d0e2b0114
ProgressMessage{id=null, status=null, stream=null, error=null, progress=null, progressDetail=null}
Successfully built ee9d0e2b0114
Successfully tagged mall-tiny/mall-tiny-docker:0.0.1-SNAPSHOT
[INFO] Built mall-tiny/mall-tiny-docker:0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 20.550 s
[INFO] Finished at: 2020-07-31T15:02:15+08:00
[INFO] Final Memory: 50M/490M
[INFO] ------------------------------------------------------------------------
官方文档:https://docs.docker.com/engine/security/https/
https://github.com/macrozheng/mall-learning/tree/master/mall-tiny-docker