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Order Deny,Allow Apache evaluates the Deny directives before the Allow directives Access is allowed by default Order Allow,Deny Apache evaluates the Allow directive before Deny It denies access by default
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Notice the lack of space between the commas The syntax allows separation of keywords with a comma only, meaning no white space Following is an example of the Order directive working with the Deny and Allow directives:
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<Directory "/my/directory/"> Order Deny,Allow Deny from all Allow from specialserverorg </Directory>
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In this example, only people who come from specialserverorg can access /my/directory/ The default is to allow people, but the Deny from all negates that Use the Satisfy directive in concert with the Allow and Deny directives It is really useful only if access to a directory, location, or file is restricted by both username/password and client host address When this happens, use the Satisfy directive to modify the default behavior (which is to require both) Within the directory or htaccess context, Satisfy any means that the client only has to satisfy host restriction or enter a valid username and password Although we do not recommend using htaccess for access control, the default configuration of Apache allows for it and sets the access to Deny from all If the htaccess method is used, modify the AllowOveride directive accordingly Remember that the changes will apply, and turn on the stat call for all subdirectories To use clear text authentication to access the entire Web-space, follow this process Add the following lines to the DocumentRoot Directory block
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AuthType Basic AuthName "Restricted Site" AuthUserFile /etc/httpd/conf/users Require valid-user
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These additional directives could also be put in the htaccess file, but, as stated, we do not recommend using the htaccess files for performance reasons
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Now it looks like this:
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<Directory /> Options FollowSymLinks AllowOverride None AuthType Basic AuthName "NonFreeZone" AuthUserFile /etc/httpd/conf/users Require valid-user </Directory>
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To display the usage options of the httpasswd program, type the following at the root prompt:
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root@foo $ cd /usr/local/apache root@foo apache $ bin/htpasswd -
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Create a new user and set the password:
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root@foo apache $ bin/htpasswd /etc/httpd/conf/users test New password: Re-type new password: Adding password for user test root@foo apache $ bin/apachectl restart
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The AuthUserFile line found in the httpdconf file must correspond to the httpasswd file If the httpasswd file does not exist, use the -c option for the httpasswd command to create the file
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root@foo apache $ bin/htpasswd -c /etc/httpd/conf/users test
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Open up a browser on the client machine, and try logging into the Web site http://domainsuffix You will be prompted with a password required dialog box (see Figure 42) This information could be applied to any directory, but by doing it this way, a valid-user login is required to access the entire site For more information, see the online documentation for the Require directives and those directives associated with it
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Password Required dialog box prompt
Anonymous Access
Anonymous access uses the anon_auth_module to allow anonymous users to sign in with a default username and a valid e-mail address in order to access information Apache checks the e-mail address validity by looking for both the @ and the symbols The anonymous access method is good for tracking users because it does not rely on cookies, but rather logs the e-mail address entered by the user as the client moves around a site When anonymous access is selected, it is necessary to select the valid user IDs using the Anonymous directive For example:
Anonymous test welcome joe_user
This would allow anybody logging in with test, welcome, or joe_user to access the system
Setting Up the Apache Proxy
This section provides walk-throughs for setting up Apache as a proxy The different configurations and security issues that can occur, when using Apache as a proxy, will also be discussed
Proxy Specific Directives
Table 41 shows some of the Apache proxy common directives
4 Table 41 Apache Proxy Common Directives DESCRI PTION Turns the proxy functionality on Turns the proxy functionality off Specifies a remote proxy for the given protocol (If the * option can be given as the remote server, the server will be contacted for all requests) Allows servers behind a firewall to be available via Internet without changing firewall rules or compromising security settings Allows the Apache proxy module to share its load with proxy servers
DERIVATIVE AN D SYNTAX ProxyRequests on ProxyRequests off ProxyRemote remoteserver = protocol: //hostname [:port] ProxyPass path url