簡述幾個安裝步驟
首先安裝 Certbot Ports 套件，這也是 Let's Encrypt 建議的工具
# cd /usr/ports/security/py-certbot/
# make install clean
這過程會有一點久，因為它要連同一起裝 python
安裝好之後就可以來申請憑證了，首先先確認您的網站根目錄在哪兒，以我的來說是在 /usr/local/www/apache24/data 底下，這路徑等等會用到
申請憑證指令如下 (請自行更換紅字網址名稱)
# certbot certonly --webroot --webroot-path /usr/local/www/apache24/data/ -d www.bojack.com
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Enter email address (used for urgent renewal and security notices) (Enter 'c' to
cancel): bojack@bojack.com <--- 請輸入您的 Email
-------------------------------------------------------------------------------
Please read the Terms of Service at
https://letsencrypt.org/documents/LE-SA-v1.1.1-August-1-2016.pdf. You must agree
in order to register with the ACME server at
https://acme-v01.api.letsencrypt.org/directory
-------------------------------------------------------------------------------
(A)gree/(C)ancel: A <--- 同意使用條款
-------------------------------------------------------------------------------
Would you be willing to share your email address with the Electronic Frontier
Foundation, a founding partner of the Let's Encrypt project and the non-profit
organization that develops Certbot? We'd like to send you email about EFF and
our work to encrypt the web, protect its users and defend digital rights.
-------------------------------------------------------------------------------
(Y)es/(N)o: Y <--- 同意分享 Email 給 Electronic Frontier Foundation 加入他們 mailinglist (會另外收到一封 Email)
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for www.bojack.com
Using the webroot path /usr/local/www/apache24/data for all unmatched domains.
Waiting for verification...
Cleaning up challenges
IMPORTANT NOTES:
- Congratulations! Your certificate and chain have been saved at
/usr/local/etc/letsencrypt/live/www.bojack.com/fullchain.pem.
Your cert will expire on 2017-10-31. To obtain a new or tweaked
version of this certificate in the future, simply run certbot
again. To non-interactively renew *all* of your certificates, run
"certbot renew"
- Your account credentials have been saved in your Certbot
configuration directory at /usr/local/etc/letsencrypt. You should
make a secure backup of this folder now. This configuration
directory will also contain certificates and private keys obtained
by Certbot so making regular backups of this folder is ideal.
- If you like Certbot, please consider supporting our work by:
Donating to ISRG / Let's Encrypt: https://letsencrypt.org/donate
Donating to EFF: https://eff.org/donate-le
好了，這樣就完成憑證申請的作業，上面標藍色的字就是我們存放憑證的位置，同時也告知您憑證有效期限為三個月
接下來要將憑證搬到 Apache 目錄底下
#cp -LRp /usr/local/etc/letsencrypt/live/ /usr/local/etc/apache24/certs
搬完之後就來設定我們 httpd-ssl.conf
# vi /usr/local/etc/apache24/httpd.conf
要記得載入 LoadModule ssl_module libexec/apache24/mod_ssl.so
( 我在啟用 HTTPS 曾發生錯誤，後來發現也要載入 LoadModule socache_shmcb_module libexec/apache24/mod_socache_shmcb.so ，這部份就看您啟用時會不會有錯 )
Include etc/apache24/extra/httpd-ssl.conf 前面的 # 記得拿掉，這樣 httpd-ssl.conf 就搞定了
接下來設定 httpd-ssl.conf
# vi /usr/local/etc/apache24/extra/httpd-ssl.conf
我將 <VirtualHost _default_:443> 這一行(包含)以下的東西全刪光，替換成以下設定，請記得替換掉紅字的部份喔
<VirtualHost *:443>
ServerName www.bojack.com:443
ServerAdmin bojack@bojack.com
SSLEngine on
SSLCertificateFile "/usr/local/etc/apache24/certs/www.bojack.com/fullchain.pem"
SSLCertificateKeyFile "/usr/local/etc/apache24/certs/www.bojack.com/privkey.pem"
</VirtualHost>
設定好之後就可以啟動 Apache 了，此時連到 https://your_web_site/ 應該就可以看到已經成功啟用加密囉 !
工作還沒完，稍早有提到憑證有效期是三個月，因此我們必須讓它自動去更新憑證，可以寫一個 shell script 定期每週去檢查，請記得替換掉紅字的部份喔
#/bin/sh
/usr/local/bin/certbot renew
if ! diff "/usr/local/etc/letsencrypt/live/www.bojack.com/fullchain.pem" \
"/usr/local/etc/apache24/certs/www.bojack.com/fullchain.pem" >/dev/null 2>&1; then
cp -LRp /usr/local/etc/letsencrypt/live/ /usr/local/etc/apache24/certs/
service apache24 restart
fi
把這個 shell 存起來，舉例我放在 /root/work/check_cert.sh，最後寫進 crontab 就可以讓它每週自行檢查囉
@weekly /root/work/check_certs.sh
參考資料
How to configure Let's Encrypt on FreeBSD with Apache in a jail - https://danm.io/2016/07/08/how-to-configure-letsencrypt-on-freebsd-with-jails.html
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