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Elastic Stack 6 : X-Pack.Security の設定2018/02/25
 
X-Pack.Security の機能を有効に設定します。
当例はこちらの例の通り X-Pack インストール直後に Security を無効化した状態を前提としています。
[1] Elasticsearch が稼働する全ノードで X-Pack.Security 機能を有効にします。また Master ノード上で接続用のパスワードを設定します。
[root@dlp ~]#
vi /etc/elasticsearch/elasticsearch.yml
xpack.license.self_generated.type: trial
xpack.monitoring.enabled: true
# Security を有効化

xpack.security.enabled:
true

xpack.watcher.enabled: false
xpack.ml.enabled: false
[root@dlp ~]#
systemctl restart elasticsearch kibana logstash

[root@dlp ~]#
/usr/share/elasticsearch/bin/x-pack/setup-passwords interactive 

Initiating the setup of passwords for reserved users elastic,kibana,logstash_system.
You will be prompted to enter passwords as the process progresses.
Please confirm that you would like to continue [y/N] y

# 任意の Master ノードでパスワード設定
# kibana, logstash は未稼働であってもパスワード設定は要求される
Enter password for [elastic]:
Reenter password for [elastic]:
Enter password for [kibana]:
Reenter password for [kibana]:
Enter password for [logstash_system]:
Reenter password for [logstash_system]:
Changed password for user [kibana]
Changed password for user [logstash_system]
Changed password for user [elastic]
[2] Elasticsearch が稼働する任意の Master ノード上で Elasticsearch クラスター内のノード間で使用される証明書を生成します。
[root@dlp ~]#
/usr/share/elasticsearch/bin/x-pack/certutil ca 

This tool assists you in the generation of X.509 certificates and certificate
signing requests for use with SSL/TLS in the Elastic stack.

The 'ca' mode generates a new 'certificate authority'
This will create a new X.509 certificate and private key that can be used
to sign certificate when running in 'cert' mode.

Use the 'ca-dn' option if you wish to configure the 'distinguished name'
of the certificate authority

By default the 'ca' mode produces a single PKCS#12 output file which holds:
    * The CA certificate
    * The CA's private key

If you elect to generate PEM format certificates (the -pem option), then the output will
be a zip file containing individual files for the CA certificate and private key

# 出力ファイル名を指定 (デフォルトでOKなら空Enter)
Please enter the desired output file [elastic-stack-ca.p12]:
# 任意のパスワードを設定
Enter password for elastic-stack-ca.p12 :
# --ca [生成済みの CA ファイル名]

[root@dlp ~]#
/usr/share/elasticsearch/bin/x-pack/certutil cert --ca elastic-stack-ca.p12 

This tool assists you in the generation of X.509 certificates and certificate
signing requests for use with SSL/TLS in the Elastic stack.

The 'cert' mode generates X.509 certificate and private keys.
    * By default, this generates a single certificate and key for use
       on a single instance.
    * The '-multiple' option will prompt you to enter details for multiple
       instances and will generate a certificate and key for each one
    * The '-in' option allows for the certificate generation to be automated by describing
       the details of each instance in a YAML file

    * An instance is any piece of the Elastic Stack that requires a SSL certificate.
      Depending on your configuration, Elasticsearch, Logstash, Kibana, and Beats
      may all require a certificate and private key.
    * The minimum required value for each instance is a name. This can simply be the
      hostname, which will be used as the Common Name of the certificate. A full
      distinguished name may also be used.
    * A filename value may be required for each instance. This is necessary when the
      name would result in an invalid file or directory name. The name provided here
      is used as the directory name (within the zip) and the prefix for the key and
      certificate files. The filename is required if you are prompted and the name
      is not displayed in the prompt.
    * IP addresses and DNS names are optional. Multiple values can be specified as a
      comma separated string. If no IP addresses or DNS names are provided, you may
      disable hostname verification in your SSL configuration.

    * All certificates generated by this tool will be signed by a certificate authority (CA).
    * The tool can automatically generate a new CA for you, or you can provide your own with the
         -ca or -ca-cert command line options.

By default the 'cert' mode produces a single PKCS#12 output file which holds:
    * The instance certificate
    * The private key for the instance certificate
    * The CA certificate

If you elect to generate PEM format certificates (the -pem option), then the output will
be a zip file containing individual files for the instance certificate, the key and the CA certificate

If you elect to generate multiple instances certificates, the output will be a zip file
containing all the generated certificates

# CA 生成で設定したパスワードを入力
Enter password for CA (elastic-stack-ca.p12) :
# 出力ファイル名を指定 (デフォルトでOKなら空Enter)
Please enter the desired output file [elastic-certificates.p12]:
# 任意のパスワードを設定
Enter password for elastic-certificates.p12 :

Certificates written to /root/elastic-certificates.p12

This file should be properly secured as it contains the private key for
your instance.

This file is a self contained file and can be copied and used 'as is'
For each Elastic product that you wish to configure, you should copy
this '.p12' file to the relevant configuration directory
and then follow the SSL configuration instructions in the product guide.

For client applications, you may only need to copy the CA certificate and
configure the client to trust this certificate.
[root@dlp ~]#
chgrp elasticsearch elastic-certificates.p12 elastic-stack-ca.p12

[root@dlp ~]#
chmod 640 elastic-certificates.p12 elastic-stack-ca.p12

[root@dlp ~]#
mv elastic-certificates.p12 elastic-stack-ca.p12 /etc/elasticsearch/

[3]
[2] で生成した証明書を Elasticsearch が稼働する全ノードの同じディレクトリ配下へコピーしておきます。
[4] Elasticsearch が稼働する全ノードで、生成した証明書の設定を追加します。
# [2] で生成した CA のパスワードをキーストアに登録

[root@dlp ~]#
/usr/share/elasticsearch/bin/elasticsearch-keystore add xpack.security.transport.ssl.keystore.secure_password

Enter value for xpack.security.transport.ssl.keystore.secure_password:
# [2] で生成した証明書のパスワードをキーストアに登録

[root@dlp ~]#
/usr/share/elasticsearch/bin/elasticsearch-keystore add xpack.security.transport.ssl.truststore.secure_password

Enter value for xpack.security.transport.ssl.truststore.secure_password:
[root@dlp ~]#
vi /etc/elasticsearch/elasticsearch.yml
# 最終行に追記

xpack.security.transport.ssl.enabled: true
xpack.security.transport.ssl.verification_mode: certificate
xpack.security.transport.ssl.keystore.path: /etc/elasticsearch/elastic-certificates.p12
xpack.security.transport.ssl.truststore.path: /etc/elasticsearch/elastic-certificates.p12
[root@dlp ~]#
systemctl restart elasticsearch

[5] クライアントから Elasticsearch へアクセスする際の SSL 化の設定も追加しておきます。
よって、事前にSSL証明書を取得して準備しておく必要があります。
当例では [/etc/elasticsearch] 配下に取得した SSL証明書をコピー済みとして進めます。
[root@dlp ~]#
chgrp elasticsearch /etc/elasticsearch/*.pem

[root@dlp ~]#
chmod 640 /etc/elasticsearch/*.pem

[root@dlp ~]#
vi /etc/elasticsearch/elasticsearch.yml
# 最終行に追記

xpack.security.http.ssl.enabled: true
xpack.security.http.ssl.key: /etc/elasticsearch/privkey.pem
xpack.security.http.ssl.certificate: /etc/elasticsearch/fullchain.pem
[root@dlp ~]#
systemctl restart elasticsearch
# https アクセス確認 : [-u elastic] は [1] で設定したユーザーとパスワードで応答

[root@dlp ~]#
curl https://dlp.srv.world:9200/_cat/indices?v -u elastic 

Enter host password for user 'elastic':
health status index                             uuid    pri rep docs.count docs.deleted store.size ...
green  open   .security-6                       793s...   1   1          3            0     19.7kb ...
green  open   .monitoring-es-6-2018.03.02       gxG-...   1   1       7725           28     20.3mb ...
green  open   sshd_fail-2018.03                 sInv...   5   1         11            0    148.6kb ...
green  open   .monitoring-logstash-6-2018.03.02 31qx...   1   1        164            0    352.1kb ...
green  open   .monitoring-kibana-6-2018.03.02   4WZh...   1   1         11            0     37.1kb ...
green  open   test_index                        1vKm...   5   1          1            0     12.2kb ...
[6] Kibana および Logstash 稼働中の場合は、そちらも Security プラグイン対応の設定が必要です。
[root@dlp ~]#
vi /etc/kibana/kibana.yml
# 21行目：コメント解除して https 用の URL に変更

elasticsearch.url: "
https://dlp.srv.world:9200
"
# 39行目：コメント解除して [1] で設定した Kibana 用のユーザーとパスワードに変更

elasticsearch.username: "
kibana
"
elasticsearch.password: "
password
"
[root@dlp ~]#
systemctl restart kibana
[root@dlp ~]#
vi /etc/logstash/logstash.yml
# 最終行に追記

# ユーザーとパスワードは [1] で設定したもの

xpack.monitoring.enabled: true
xpack.monitoring.elasticsearch.url: "https://dlp.srv.world:9200/"
xpack.monitoring.elasticsearch.username: "logstash_system"
xpack.monitoring.elasticsearch.password: "password"

xpack.management.enabled: true
xpack.management.elasticsearch.url: "https://dlp.srv.world:9200/"
xpack.management.elasticsearch.username: "logstash_system"
xpack.management.elasticsearch.password: "password"
[root@dlp ~]#
systemctl restart logstash
[7] Kibana ダッシュボードにアクセスすると、認証を要求されるようになります。[1] で登録したユーザーとパスワードで認証可能です。
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