Docker启用TLS实现安全配置的步骤

前言

之前开启了docker的2375 remote api，接到公司安全部门的要求，需要启用授权，翻了下官方文档

protect the docker daemon socket

启用tls

在docker服务器，生成ca私有和公共密钥

$ 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 []:[e-mail]

有了ca后，可以创建一个服务器密钥和证书签名请求(csr)

$host 是你的服务器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

接着，用ca来签署公共密钥:

$ 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:

创建客户端密钥和证书签名请求:

$ 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

生成签名私钥：

$ 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:

将docker服务停止，然后修改docker服务文件

[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

然后重启服务

systemctl daemon-reload
systemctl restart docker.service 

重启后查看服务状态：

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

已经生效。

使用证书连接：

复制ca.pem,cert.pem,key.pem三个文件到客户端

docker --tlsverify --tlscacert=ca.pem --tlscert=cert.pem --tlskey=key.pem -h=$host:2375 version连接即可

docker-java 启用tls

项目里使用docker的java客户端docker-java调用docker，为了支持tls，在创建客户端时，需要增加tls设置。

首先将ca.pem cert.pem key.pem这三个文件拷贝到本地，例如e:\\docker\\",

然后defaultdockerclientconfig里withdockertlsverify设为true，并设置certpath为刚拷贝的目录。 

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。

总结

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