環境

Ubuntu 16.04.2 LTS

nginx version: nginx/1.10.0 (Ubuntu)

クライアントをインストール

sudo apt-get install letsencrypt

コマンド実行

# 既に80でwww.example.comを公開している場合

letsencrypt certonly --webroot -w /var/www/www.example.com/htdocs -d www.example.com

-w root_path
-d ドメイン

ここまでで下記の配下に証明書が発行されます /etc/letsencrypt/live/www.example.com/

※初回の場合はメールアドレス登録と利用規約への同意が必要です

cron設定

Let's EncryptのSSL証明書は有効期限が三ヶ月なので、自動的に更新するようにcronを設定します

# 毎月01日 AM03:00に実行
00 03 01 * * letsencrypt certonly --webroot -w /var/www/www.example.com/htdocs -d www.example.com

nginxの基本設定

github.com

server {
    listen 80;
    server_name www.example.com;

    # Redirect all HTTP requests to HTTPS with a 301 Moved Permanently response.
    return 301 https://www.example.com$request_uri;
}

server {
    listen 443 ssl http2;
    server_name www.example.com;
    root /var/www/www.example.com/public;
    error_log /var/log/nginx/example.error.log;
    access_log /var/log/nginx/example.access.log;

    # certs sent to the client in SERVER HELLO are concatenated in ssl_certificate
    ssl_certificate /etc/letsencrypt/live/www.example.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/www.example.com/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/letsencrypt/private/dhparam.pem;

    # intermediate configuration. tweak to your needs.
    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
    ssl_ciphers 'ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS';
    ssl_prefer_server_ciphers on;

    # HSTS (ngx_http_headers_module is required) (15768000 seconds = 6 months)
    add_header Strict-Transport-Security max-age=15768000;

    # OCSP Stapling ---
    # fetch OCSP records from URL in ssl_certificate and cache them
    ssl_stapling on;
    ssl_stapling_verify on;

    ## verify chain of trust of OCSP response using Root CA and Intermediate certs
    ssl_trusted_certificate /etc/letsencrypt/live/www.example.com/fullchain.pem;

    resolver 8.8.4.4 8.8.8.8 valid=300s;
    resolver_timeout 10s;

    server_tokens off;
    gzip on;
    gzip_http_version 1.1;
    gzip_types text/plain
    text/xml
    text/css
    application/xml
    application/xhtml+xml
    application/rss+xml
    application/javascript
    application/x-javascript;
    gzip_buffers 4 8k;
    gzip_min_length 1000;
    gzip_comp_level 1;
    gzip_proxied off;
    gzip_disable "MSIE [1-6]\." "Mozilla/4";
    gzip_vary off;
    index index.php;

    location / {
        try_files $uri $uri/ /index.php?$query_string;
    }
    # Remove trailing slash
    if (!-d $request_filename) {
        rewrite ^/(.+)/$ /$1 permanent;
    }
    location ~ \.php {
        fastcgi_pass unix:/run/php/php7.0-fpm.sock;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        include fastcgi_params;
    }
}