How To Create a SSL Certificate on Apache for Debian 8 htttps

June 19, 2015 Security, Apache Debian

Introduction

This tutorial walks you through the setup and configuration of an
Apache server secured with an SSL certificate. By the end of the
tutorial, you will have a server accessible via HTTPS.
SSL is based on the mathematical intractability of resolving a large
integer into its also-large prime factors. Using this, we can encrypt
information using a private-public key pair. Certificate authorities can
issue SSL certificates that verify the authenticity of such a secured
connection, and on the same note, a self-signed certificate can be
produced without third-party support.
In this tutorial, we will generate a self-signed certificate, make
the necessary configurations, and test the results. Self-signed
certificates are great for testing, but will result in browser errors
for your users, so they're not recommended for production.
If you'd like to obtain a paid certificate instead, please see this tutorial.

Prerequisites

To follow this tutorial, you will need:
One fresh Debian 8 Droplet

A sudo non-root user, which you can set up by following Steps 2 and 3 of this tutorial

OpenSSL installed and updated (should be installed by default)

sudo apt-get updatesudo apt-get upgrade openssl

You may want a second computer with OpenSSL installed, for testing purposes:
Another Linux Droplet

Or, a Unix-based local system (Mac, Ubuntu, Debian, etc.)

Step 1 — Install Apache

In this step, we will use a built-in package installer called

apt-get

. It simplifies package management drastically and facilitates a clean installation.
In the link specified in the prerequisites, you should have updated

apt-get

and installed the

sudo

package, as unlike other Linux distributions, Debian 8 does not come with

sudo

installed.
Apache will be our HTTPS server. To install it, run the following:

sudo apt-get install apache2

Step 2 — Enable the SSL Module

In this section, we will enable SSL on our server.
First, enable the Apache SSL module.

sudo a2enmod ssl

The default Apache website comes with a useful template for enabling SSL, so we will activate the default website now.

sudo a2ensite default-ssl

Restart Apache to put these changes into effect.

sudo service apache2 reload

Step 3 — Create a Self-Signed SSL Certificate

First, let's create a new directory where we can store the private key and certificate.

sudo mkdir /etc/apache2/ssl

Next, we will request a new certificate and sign it.
First, generate a new certificate and a private key to protect it.
The

days

flag specifies how long the certificate should remain valid. With this example, the certificate will last for one year

The

keyout

flag specifies the path to our generated key

The

out

flag specifies the path to our generated certificate

sudo openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout /etc/apache2/ssl/apache.key -out /etc/apache2/ssl/apache.crt

Invoking this command will result in a series of prompts.
Common Name: Specify your server's IP address or
hostname. This field matters, since your certificate needs to match the
domain (or IP address) for your website

Fill out all other fields at your own discretion.

Example answers are shown in red below.

InteractiveYou 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]:USState or Province Name (full name) [Some-State]:New YorkLocality Name (eg, city) []:NYCOrganization Name (eg, company) [Internet Widgits Pty Ltd]:DigitalOceanOrganizational Unit Name (eg, section) []:SSL Certificate TestCommon Name (e.g. server FQDN or YOUR name) []:example.com               Email Address []:test@example.com

Set the file permissions to protect your private key and certificate.

sudo chmod 600 /etc/apache2/ssl/*

For more information on the three-digit permissions code, see the tutorial on Linux permissions.
Your certificate and the private key that protects it are now ready for Apache to use.

Step 4 — Configure Apache to Use SSL

debian的ssl配置文件在这里

root@uat:~# vim /etc/apache2/sites-available/default-ssl.conf

In this section, we will configure the default Apache virtual host to
use the SSL key and certificate. After making this change, our server
will begin serving HTTPS instead of HTTP requests for the default site.
Open the server configuration file using

nano

or your favorite text editor.

sudo nano /etc/apache2/sites-enabled/default-ssl.conf

Locate the section that begins with

<VirtualHost _default_:443>

and make the following changes.
Add a line with your server name directy below the

ServerAdmin

email line. This can be your domain name or IP address:

/etc/apache2/sites-enabled/default

ServerAdmin webmaster@localhost
ServerName example.com:443

Find the following two lines, and update the paths to match the
locations of the certificate and key we generated earlier. If you
purchased a certificate or generated your certificate elsewhere, make
sure the paths here match the actual locations of your certificate and
key:

/etc/apache2/sites-enabled/default

SSLCertificateFile /etc/apache2/ssl/apache.crt
SSLCertificateKeyFile /etc/apache2/ssl/apache.key

Once these changes have been made, check that your virtual host configuration file matches the following.
/etc/apache2/sites-enabled/default-ssl

<IfModule mod_ssl.c>
<VirtualHost _default_:443>
ServerAdmin webmaster@localhost
ServerName example.com:443
DocumentRoot /var/www/html

. . .
SSLEngine on

. . .

SSLCertificateFile /etc/apache2/ssl/apache.crt
SSLCertificateKeyFile /etc/apache2/ssl/apache.key

Save and exit the file.
Restart Apache to apply the changes.

sudo service apache2 reload

To learn more about configuring Apache virtual hosts in general, see this article.

Step 5 — Test Apache with SSL

In this section, we will test your SSL connection from the command line.
You can run this test from either (1) your local Unix-based system,
(2) another Droplet, or (3) the same Droplet. If you run it from an
external system you'll confirm that your site is reachable over the
public Internet.
Open a connection via the HTTPS 443 port.

openssl s_client -connect your_server_ip:443

Scroll to the middle of the output (after the key), and you should find the following:

Output—-
SSL handshake has read 3999 bytes and written 444 bytes
—-

. . .

SSL-Session:

. . .

Of course, the numbers are variable, but this is success. Congratulations!
Press

CTRL+C

to exit.
You can also visit your site in a web browser, using HTTPS in the URL (

https://example.com

).
Your browser will warn you that the certificate is self-signed. You
should be able to view the certificate and confirm that the details
match what you entered in Step 3.

Conclusion

This concludes our tutorial, leaving you with a working Apache
server, configured securely with an SSL certificate. For more
information on working with OpenSSL, see the OpenSSL Essentials article.