Create SSL Certificate (Self Signed)2023/12/20

Create Self Signed SSL Certificate by yourself.
It had better to use Self Signed Certificate on the environment for the purpose of testing, development, and so on. It's not recommended to use on production System.

root@dlp:~ #

vi /etc/ssl/openssl.cnf

# add to last line
# section name is any name you like
# DNS:(this server's hostname)
# if you set multiple hostname or domainname, set them with comma separated
# ⇒ DNS:dlp.srv.world, DNS:www.srv.world

[ srv.world ]
subjectAltName = DNS:dlp.srv.world

root@dlp:~ #

mkdir /usr/local/etc/ssl

root@dlp:~ #

cd /usr/local/etc/ssl

root@dlp:/usr/local/etc/ssl #

openssl ecparam -name prime256v1 -genkey -out server.key

root@dlp:/usr/local/etc/ssl #

openssl req -new -key server.key -out server.csr

You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [AU]:JP                            # country code
State or Province Name (full name) [Some-State]:Hiroshima       # state
Locality Name (eg, city) []:Hiroshima                           # city
Organization Name (eg, company) [Internet Widgits Pty Ltd]:GTS  # company
Organizational Unit Name (eg, section) []:Server World          # department
Common Name (e.g. server FQDN or YOUR name) []:dlp.srv.world    # server's FQDN
Email Address []:root@srv.world                                 # admin email address

Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []:
An optional company name []:

# create certificate with 10 years expiration date
# -extensions (section name) ⇒ the section name you set in [openssl.cnf]

root@dlp:/usr/local/etc/ssl #

openssl x509 -in server.csr -out server.crt -req -signkey server.key -extfile /etc/ssl/openssl.cnf -extensions srv.world -days 3650

Certificate request self-signature ok
subject=C = JP, ST = Hiroshima, L = Hiroshima, O = GTS, OU = Server World, CN = dlp.srv.world, emailAddress = root@srv.world

root@dlp:/usr/local/etc/ssl #

ls -l

-rw-r--r--  1 root wheel 1424 Dec 20 15:21 server.crt
-rw-r--r--  1 root wheel 1062 Dec 20 15:21 server.csr
-rw-------  1 root wheel 1704 Dec 20 15:20 server.key

Matched Content