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

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　　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 canissue 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 apache2Step 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 reloadStep 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 touse 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  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
　　
   
　　
        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.