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In most Apache installations, there are four main directories: 1 ServerRoot-specified directory where server configuration (conf subdirectory) and binary files (bin subdirectory) and other serverspecific files are stored 2 DocumentRoot-specified directory where your Web site contents, such as HTML pages, Java Scripts, and images, are stored 3 ScriptAlias-specified directory where your CGI scripts are stored 4 CustomLog- or ErrorLog-specified directory where access and error log files are stored You can specify a different directory for each of these directives but keeping a single log directory for all the log files is likely to be more manageable in the long run I recommend that you use a directory structure in which each of the four primary directories is independent of the others In other words, none of the above directories are subdirectories of another directory ServerRoot should point to a directory that can only be accessed by the root user The DocumentRoot directory needs to be accessible to user(s) who maintain your Web site and to the Apache user or group (specified by using the User and Group directives in httpdconf file) The ScriptAlias-specified script directory should only be accessible to script developer(s) and Apache user or group The CustomLog- or ErrorLogspecified directory should only be accessible by the root user Not even the Apache user or group should have access to the log directory An example of such a directory structure is shown below

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(ServerRoot)

(DocumentRoot)

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(ScriptAlias) (CustomLog and ErrorLog)

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The above directory structure is safe in many ways To understand why, first look at the following Apache configuration in httpdconf for the above directory structure

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ServerRoot DocumentRoot ScriptAlias CustomLog ErrorLog /home/httpd /www/htdocs /cgi-bin/ /www/cgi-bin/ /www/logs/accesslog common /www/logs/errorlog

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Because each of these major directories is independent (that is, none is a subdirectory of another) they are safe from one another A permission mistake in one directory will not affect another directory If you do not think this is a big deal, count the number of years you have been involved with users and Linux and then read all of Murphy s laws The appropriate permission settings for the above directory structure need to be set

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The ServerRoot-specified directory should be only accessible by the root user because no one but the root needs to configure or run Apache The DocumentRoot should be accessible to one or more users who manage the contents of your Web site and the Apache user (specified by using User directive) or the Apache group (specified by using Group directive) For example, if you want a user called htmlguru to publish contents in your Web site, and you run Apache as httpd user, you can give both Apache and the named user access to the DocumentRoot directory by following these steps: 1 Create a new group called webteam:

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2 Add htmlguru user to the webteam group:

Summary

3 Change the ownership of the DocumentRoot directory (and all the subdirectories below it):

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This command sets the directory ownership to Apache (that is, the httpd user) and the group ownership to webteam, which includes the htmlguru user In other words, both Apache and htmlguru will both have access to the document tree 4 Change the permission of the DocumentRoot directory (and all the subdirectories below it) as follows:

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This command ensures that the files and subdirectories under the DocumentRoot are readable and executable by the Apache user and that the webteam group can read, write, and execute everything It also ensures that whenever a new file or directory is created in the document tree, the webteam group will have access to it A great advantage of this method is that adding new users to the webteam is as simple as running the following command:

Similarly, if you wish to remove an existing user from the webteam group, simply run:

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usermod -G username [group1,group2,group3,]

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where group1, group2, group3, and so on are groups (excluding webteam group) that this user belongs to

The ScriptAlias-specified directory should be only accessible to the CGI developers and the Apache user specified using the User directive in httpdconf I recommend that you create a new group called webdev for the developer(s) Although the developer group (such as webdev) needs read, write, and execute access for the directory, the Apache user only requires read and execute access Do not allow Apache user to write files in this directory For example, say you have the following ScriptAlias in your httpdconf:

Cache Distributed Transaction Coordinator ICMP IP LogicalDisk Memory Network Interface Objects PhysicalDisk Process Processor Redirector System TCP Terminal Services Terminal Services Session UDP 3 8/17 7/17 6/17 1 0/17 4/17 3/17 14/17 6/17

Summary

ScriptAlias /cgi-bin/ /www/cgi-bin/

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If httpd is your Apache user and webdev is your developer group, you should set permission for /www/cgi-bin as follows:

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