Part IV Implementing Network Services in SUSE Linux in .NET

Make Code 128A in .NET Part IV Implementing Network Services in SUSE Linux
Part IV Implementing Network Services in SUSE Linux
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Security is a big issue when it comes to computers these days and can mean different things to different people. To an administrator it can mean the following questions: Is the server locked down and the software up-to-date and free of any known vulnerabilities To an application developer it might mean that the user has been verified and that the customer data has been stored in a safe, reusable manner. To the user of the web site it could mean that the personal data remains in limited hands and that while in transit is encrypted to limit eavesdropping. All of these are valid, fundamental concerns. However, from the Apache web server s perspective, all of these issues come down to three basic concepts: authentication, authorization, and access control: Authentication Any process by which the web site verifies the identity of a user in question, that in essence they are who they claim they are Authorization Any process by which someone is allowed to gain access to information that they wish to have Access control The process of limiting users access to information that they may not have access to With the basic web server setup, these processes are managed by the Apache modules mod_auth and mod_access. You can use these modules configuration directives in the main server configuration file, httpd.conf, or in per-directory configuration files, .htaccess.
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The most common security issue for a web site is the need to password-protect a directory or file. To do this, the first step is the creation of a password file. The password file needs to reside somewhere outside of the webspace. For example, if the web site s documents reside at /srv/www/htdocs/dir on the filesystem, then the password file needs to reside somewhere outside of that space, such as /etc/http-passwd. Creating the file is simple; just use the htpasswd2 utility that comes with the Apache RPM. The utility will ask for a password for the username given as a command-line option and will ask that the password be re-entered for verification. If all goes well, the file will be created with the new entry.
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htpasswd2 -c /etc/http-passwd paul New password: Re-type new password: Adding password for user paul
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In the preceding example, a password file is created (-c) in the /etc/http-passwd directory, and a user, paul, and associated password for that user are entered into the newly created password file. To add names to an existing password file, simply omit the -c flag:
htpasswd2 /etc/http-passwd justin New password: Re-type new password: Adding password for user justin
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16 Setting Up a Web Site with the Apache Web Server
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When the password file has been properly populated with usernames and passwords, the next step is to configure the server to request a password and tell the server which users are allowed access. If, for example, there is a need to password-protect a private directory, this can be done within the httpd.conf file using the <Directory> container:
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<Directory /srv/www/htdocs/private> AuthType Basic AuthName Restricted Directory AuthUserFile /etc/http-passwd Require user paul </Directory>
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In the <Directory> container: The AuthType directive selects what HTTP method is used to authenticate the user; the most common method is Basic and is implemented by mod_auth.
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Note The Basic authentication method implemented by the Apache web server module mod_auth passes the username and password over the network between the client and the server in an unencrypted clear text manner. The Apache web server does support other authentication methods such as AuthType Digest, which is implemented by the Apache web server module mod_auth_digest. The Digest authentication type provides a more secure password system by sending only an MD5 hash of the password over the network. However, this authentication type works only with the latest version of the major web browsers currently available.
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The AuthName directive sets the realm that is requiring authorization before access. The realm name provides two major functions: The client often presents this information to the user as part of the password dialog box. It is used by the client to determine what password to send for a given authenticated area should there be more than one protected area on the same web site. The AuthUserFile directive sets the path to the password file that was created with htpasswd. The Require directive provides the authorization part of the process by defining for the web server, after a valid authentication, which users are allowed to access the defined realm.
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