Let’s Encrypt + debian9

公開ベータプログラム(Public Beta Program)が開始された
debian9で試してみる

インストール

root@debian9:/usr/local/src# apt-get install git
...
root@debian9:/usr/local/src# git clone https://github.com/letsencrypt/letsencrypt
...
root@debian9:/usr/local/src# cd letsencrypt

Let’s Encrypt クライアントソフトウェアを実行できる環境か確認する

確認が完了するとLet’s Encrypt のヘルプが表示される
どうもDebian系がオススメの模様(AmazonLinuxは現状experimentalらしい)

root@debian9:/usr/local/src/letsencrypt# ./letsencrypt-auto --help
...
   apt-get install -y --no-install-recommends git python python-dev virtualenv 
   python-virtualenv gcc dialog libaugeas0 libssl-dev libffi-dev ca-certificates
   というコマンドが実行された
...
  letsencrypt [SUBCOMMAND] [options] [-d domain] [-d domain] ...

The Let's Encrypt agent can obtain and install HTTPS/TLS/SSL certificates.  By
default, it will attempt to use a webserver both for obtaining and installing
the cert. Major SUBCOMMANDS are:

  (default) run        Obtain & install a cert in your current webserver
  certonly             Obtain cert, but do not install it (aka "auth")
  install              Install a previously obtained cert in a server
  revoke               Revoke a previously obtained certificate
  rollback             Rollback server configuration changes made during install
  config_changes       Show changes made to server config during installation
  plugins              Display information about installed plugins
...

nginxの証明書を作成する

以下をnginxのサイト設定に追記

location '/.well-known/acme-challenge' {
default_type "text/plain";
root /tmp/letsencrypt-auto;
}

証明書を作成する
途中でEmail登録画面がでてくる
2015-12-09_231055

root@debian9:/home/shimizu# export DOMAIN="-d tech.akat.info -d akat.info"
root@debian9:/home/shimizu# export DIR=/tmp/letsencrypt-auto
root@debian9:/home/shimizu# mkdir -p $DIR && /usr/local/src/letsencrypt/letsencrypt-auto certonly --server https://acme-v01.api.letsencrypt.org/directory -a webroot --webroot-path=$DIR --agree-tos $DOMAIN
Updating letsencrypt and virtual environment dependencies.......
Running with virtualenv: /root/.local/share/letsencrypt/bin/letsencrypt certonly --server https://acme-v01.api.letsencrypt.org/directory -a webroot --webroot-path=/tmp/letsencrypt-auto --agree-tos -d tech.akat.info -d akat.info


IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at
   /etc/letsencrypt/live/tech.akat.info/fullchain.pem. Your cert will
   expire on 2016-03-08. To obtain a new version of the certificate in
   the future, simply run Let's Encrypt again.
 - If like Let's Encrypt, please consider supporting our work by:

   Donating to ISRG / Let's Encrypt:   https://letsencrypt.org/donate
   Donating to EFF:                    https://eff.org/donate-le

root@debian9:/home/shimizu# ls /etc/letsencrypt/live/tech.akat.info/
cert.pem  chain.pem  fullchain.pem  privkey.pem

SSL証明書を設置する

SSL設定についてはMozilla SSL Configuration Generatorを利用した

listen 443 ssl;
# certs sent to the client in SERVER HELLO are concatenated in ssl_certificate
ssl_certificate /etc/letsencrypt/live/akat.info/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/akat.info/privkey.pem;
ssl_session_timeout 1d;
ssl_session_cache shared:SSL:50m;
ssl_session_tickets off;

# Diffie-Hellman parameter for DHE ciphersuites, recommended 2048 bits
ssl_dhparam /etc/ssl/private/dhparam.pem;

# intermediate configuration. tweak to your needs.
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers 'ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:ECDHE-RSA-DES-CBC3-SHA:ECDHE-ECDSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA';
ssl_prefer_server_ciphers on;

アクセスすると
2015-12-10_013930
2015-12-10_015401

困ったときの証明書確認方法

root@debian9:/home/shimizu# openssl x509 -text -noout -in /etc/letsencrypt/live/tech.akat.info/fullchain.pem
Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number:
            01:10:86:c4:52:70:57:06:82:e6:bc:1a:ee:bc:ba:1b:1e:28
    Signature Algorithm: sha256WithRSAEncryption
        Issuer: C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X1
        Validity
            Not Before: Dec  9 15:13:00 2015 GMT
            Not After : Mar  8 15:13:00 2016 GMT
        Subject: CN=tech.akat.info
...

root@debian9:/home/shimizu# openssl s_client -connect tech.akat.info:443 -showcerts
### s:証明書情報、i:証明書発行者情報 ###
...
Certificate chain
 0 s:/CN=tech.akat.info
   i:/C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X1
...

参考URL

Let’s Encrypt の使い方
How It Works
One-line certificate generation/renews with Letsencrypt and nginx

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