Get SSL Certificate (Let's Encrypt)

 Get SSL Certificates from Let's Encrypt who provides Free SSL Certificates.

Refer to the details for Let's Encrypt official site below.

⇒ https://letsencrypt.org/

By the way, expiration date of a cert is 90 days, so you must update within next 90 days later.

[1]. Install Certbot Client which is the tool to get certificates from Let's Encrypt.

[root@dlp ~]# dnf module -y install python36

[root@dlp ~]# dnf -y install gcc mod_ssl python3-virtualenv redhat-rpm-config augeas-libs libffi-devel openssl-devel

[root@dlp ~]# curl -O https://dl.eff.org/certbot-auto

[root@dlp ~]# mv certbot-auto /usr/local/bin/

[root@dlp ~]# chmod 700 /usr/local/bin/certbot-auto

[2]. Get certificates.

It needs Web server like Apache httpd or Nginx must be runing on the server you work.

If no Web server is running, skip this section and Refer to [3] section.

Furthermore, it needs that it's possible to access from the Internet to your working server on port 80 because of verification from Let's Encrypt.

# for the option [--webroot], use a directory under the webroot on your server as a working temp

# -w [document root] -d [FQDN you'd like to get certs]

# FQDN (Fully Qualified Domain Name) : Hostname.Domainname

# if you'd like to get certs for more than 2 FQDNs, specify all like below

# ex : if get [srv.world] and [dlp.srv.world]

# ⇒ -d srv.world -d dlp.srv.world

[root@dlp ~]# certbot-auto certonly --webroot -w /var/www/html -d dlp.srv.world

Bootstrapping dependencies for RedHat-based OSes that will use Python3... (you can skip this with --no-bootstrap)

dnf is /usr/bin/dnf

dnf is hashed (/usr/bin/dnf)

.....

.....

# for only initial using, register your email address and agree to terms of use

# specify valid email address

Enter email address (used for urgent renewal and security notices) 

(Enter 'c' to cancel): root@mail.srv.world 


- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Please read the Terms of Service at

https://letsencrypt.org/documents/LE-SA-v1.2-November-15-2017.pdf. You must

agree in order to register with the ACME server at

https://acme-v02.api.letsencrypt.org/directory

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

# agree to the terms of use

(A)gree/(C)ancel: A


- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

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 our work

encrypting the web, EFF news, campaigns, and ways to support digital freedom.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

(Y)es/(N)o: Y

Obtaining a new certificate

Performing the following challenges:

http-01 challenge for dlp.srv.world

Using the webroot path /var/www/html for all unmatched domains.

Waiting for verification...

Cleaning up challenges


IMPORTANT NOTES:

 - Congratulations! Your certificate and chain have been saved at:

   /etc/letsencrypt/live/dlp.srv.world/fullchain.pem

   Your key file has been saved at:

   /etc/letsencrypt/live/dlp.srv.world/privkey.pem

   Your cert will expire on 2020-03-17. To obtain a new or tweaked

   version of this certificate in the future, simply run certbot-auto

   again. To non-interactively renew *all* of your certificates, run

   "certbot-auto renew"

 - Your account credentials have been saved in your Certbot

   configuration directory at /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


# success if [Congratulations] is shown

# certs are created under the [/etc/letsencrypt/live/(FQDN)/] directory


# cert.pem       ⇒ SSL Server cert(includes public-key)

# chain.pem      ⇒ intermediate certificate

# fullchain.pem  ⇒ combined file cert.pem and chain.pem

# privkey.pem    ⇒ private-key file

[3]. If no Web Server is running on your working server, it's possbile to get certs with using Certbot's Web Server feature. Anyway, it needs that it's possible to access from the Internet to your working server on port 80 because of verification from Let's Encrypt.

# for the option [--standalone], use Certbot's Web Server feature

# -d [FQDN you'd like to get certs]

# FQDN (Fully Qualified Domain Name) : Hostname.Domainname

# if you'd like to get certs for more than 2 FQDNs, specify all like below

# ex : if get [srv.world] and [mail.srv.world] ⇒ -d srv.world -d mail.srv.world

[root@dlp ~]# certbot-auto certonly --standalone -d mail.srv.world

Saving debug log to /var/log/letsencrypt/letsencrypt.log

Plugins selected: Authenticator standalone, Installer None

Obtaining a new certificate

Performing the following challenges:

http-01 challenge for mail.srv.world

Waiting for verification...

Cleaning up challenges


IMPORTANT NOTES:

 - Congratulations! Your certificate and chain have been saved at:

   /etc/letsencrypt/live/mail.srv.world/fullchain.pem

   Your key file has been saved at:

   /etc/letsencrypt/live/mail.srv.world/privkey.pem

   Your cert will expire on 2020-03-17. To obtain a new or tweaked

   version of this certificate in the future, simply run certbot-auto

   again. To non-interactively renew *all* of your certificates, run

   "certbot-auto renew"

 - 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

[4]. For Updating existing certs, Do like follows.

# update all certs which has less than 30 days expiration

# if you'd like to update certs which has more than 30 days expiration, add [--force-renew] option

[root@dlp ~]# certbot-auto renew

[5] If you'd like to convert certificates to PKCS12 (PFX) format for Windows, do like follows.

[root@dlp ~]# openssl pkcs12 -export -in fullchain.pem -inkey privkey.pem -out dlp_for_iis.pfx

Enter Export Password:     # set any export password

Verifying - Enter Export Password:


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