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The mod_ssl implementation of SSL provides an alternate access to your Web server using a different port (443) and a different protocol, https. In effect, you have both an SSL server and a nonsecure version. To access the secure SSL version you use the protocol https instead of http for the Web server's URL address. For example, to access the SSL version for the Web server running at www.mytrek.com, you would use the protocol https in its URL, as shown here.
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https://www.mytrek.com
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You can configure mod_ssl using a number of configuration directives in the Apache configuration file, smb.conf. On Red Hat, the default configuration file installed with Apache contains a section for the SSL directives along with detailed comments. Check the online documentation for mod_ssl at www.modssl.org for a detailed reference listing all the directives. There are global, server-based, and directory-based directives available. In the Red Hat smb.conf file, the inclusion of SSL directives is controlled by IfDefine blocks enabled by the HAVE_SSL flag. For example, the following code will load the SSL module.
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<IfDefine HAVE_SSL> LoadModule ssl_module </IfDefine> modules/libssl.so
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The SSL version for your Apache Web server is set up in the smb.conf file as a virtual host. The SSL directives are enabled by an ifDefine block using the HAVE_SSL flag. Several default directives are implemented such as the location of SSL key directories and the port that the SSL version of the server will listen on (443). Others are commented out. You can enable them by removing the preceding # symbol, setting your own options. Several of the directives are shown here.
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<IfDefine HAVE_SSL> ## SSL Virtual Host Context # Apache will only listen on port 80 by default. Defining the virtual server # (below) won't make it automatically listen on the virtual server's port.
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Listen 443 <VirtualHost _default_:443> # General setup for the virtual host DocumentRoot "/var/www/html" # SSL Engine Switch: # Enable/Disable SSL for this virtual host. SSLEngine on #SSLCipherSuite ALL:!ADH:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP:+eNULL # Server Certificate: SSLCertificateFile /etc/httpd/conf/ssl.crt/server.crt #SSLCertificateFile /etc/httpd/conf/ssl.crt/server-dsa.crt # Server Private Key: SSLCertificateKeyFile /etc/httpd/conf/ssl.key/server.key # Certificate Authority (CA): #SSLCACertificatePath /etc/httpd/conf/ssl.crt #SSLCACertificateFile /etc/httpd/conf/ssl.crt/ca-bundle.crt
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In the /etc/httpd/conf directory, mod_ssl will set up several SSL directories that will contain SSL authentication and encryption keys and data. The ssl.crt directory will hold certificates for the server. The ssl.key directory holds the public and private keys used in authentication encryption. Revocation lists for revoking expired certificates are kept in ssl.crl. The ssl.csr directory holds the certificate signing request used to request an official certificate from a certificate authority. ssl.prm holds parameter files used by the DSA key encryption method. Check the README files in each directory for details on the SSL files they contain. The mod_ssl installation will provide you with a demonstration certificate called snakeoil that you can use to test your SSL configuration. When you have an official certificate, you can install it with the make certificate command within the ssl.crt directory. This will overwrite the server.crt server certificate file.
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Overview
The Domain Name Service (DNS) is an Internet service that converts domain names into their corresponding IP addresses. As you may recall, all computers connected to the Internet are addressed using an Internet Protocol (IP) address. The IP address may be implemented in either the newer IPV6 (Internet Protocol Version 6) format or on the older and more common IPV4 (Internet Protocol Version 4) format. Since most systems still use the IPV4 addressing, that format will be used in these examples. In the older IPV4 format, the IP address consists of a number composed of four segments separated by periods. Depending on the type of network, several of the first segments are used for the network address and several of the last segments are used for the host address. In a standard class C network used in smaller networks, the first three segments are the computer's network address, and the last segment is the computer's host ID (as used in these examples). For example, in the address 192.168.1.2, 192.168.1 is the network address and 2 is the computer's host ID within that network.
Together, they make up an IP address with which the computer can be addressed from anywhere on the Internet. IP addresses, though, are difficult to remember and easy to get wrong. As a normal user on a network might have to access many different hosts, keeping track of the IP addresses needed quickly became a problem. It was much easier to label hosts with names and use the names to access them. Names were associated with IP addresses. When a user used a name to access a host, the corresponding IP address was looked up first and then used to provide access. IP addresses were associated with corresponding names, called fully qualified domain names. A fully qualified domain name is composed of three or more segments: The first segment is the name to identify the host, and the remaining segments are for the network in which the host is located. The network segments of a fully qualified domain name are usually referred to simply as the domain name, while the host part is referred to as the hostname (though this is also used to refer to the complete fully qualified domain name). In effect, subnets are referred to as domains. The fully qualified domain name, www.linux.org, has an IP address 198.182.196.56, where 198.182.196 is the network address and 56 is the host ID. Computers can be accessed only with an IP address. So, a fully qualified domain name must first be translated into its corresponding IP address to be of any use. The parts of the IP address that make up the domain name and the hosts can vary. See 38 for a detailed discussion of IP addresses, including network classes and Classless Interdomain Routing (CIDR). Any computer on the Internet can maintain a file that manually associates IP addresses with domain names. On Linux and Unix systems, this file is called the /etc/hosts file. Here, you can enter the IP addresses and domain names of computers you commonly access. Using this method, however, each computer needs a complete listing of all other computers on the Internet, and that listing must be updated constantly. Early on, this became clearly impractical for the Internet, though it is still feasible for small isolated networks. The Domain Name Service has been implemented to deal with the task of translating the domain name of any computer on the Internet to its IP address. The task is carried out by interconnecting servers that manage the Domain Name Service (also referred to either as DNS servers or as name servers). These DNS servers keep lists of fully qualified domain names and their IP addresses, matching one up with the other. This service that they provide to a network is referred to as the Domain Name Service. The Internet is composed of many connected subnets called domains, each with its own Domain Name Service (DNS) servers that keep track of all the fully qualified domain names and IP addresses for all the computers on its network. DNS servers are hierarchically linked to root servers, which, in turn, connect to other root servers and the DNS servers on their subnets throughout the Internet. The section of a network for which a given DNS server is responsible is called a zone. Although a zone may correspond to a domain, many zones may, in fact, be within a domain, each with its own name server. This is true for large domains where too many systems exist for one name server to manage. When a user enters a fully qualified domain name to access a remote host, a resolver program queries the local network's DNS server requesting the corresponding IP address for that remote host. With the IP address the user can then access the remote host. In Figure 25-1, the user at rabbit.mytrek.com wants to connect to the remote host lizard. mytrek.com. rabbit.mytrek.com first sends a request to the network's DNS server-in this case, turtle.mytrek.com-to look up the name lizard.mytrek.com and find its IP address. It then returns the IP address for lizard.mytrek.com, 192.168.1.3, to the requesting host,
rabbit.mytrek.com. With the IP address, the user at rabbit.mytrek.com can then connect to lizard.mytrek.com.
Figure 25-1: DNS server operation The names of the DNS servers that service a host's network are kept in the host's /etc/resolv.conf file. When setting up an Internet connection, the name servers provided by your Internet service provider (ISP) were placed in this file. These name servers resolve any fully qualified domain names that you use when you access different Internet sites. For example, when you enter a Web site name in your browser, the name is looked up by the name servers, and the name's associated IP address is then used to access the site.
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