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Date: Tue, 05 Nov 1996 21:47:43 GMTServer: NCSA/1.5Content-type: text/htmlLast-modified: Mon, 17 Oct 1994 12:54:35 GMTContent-length: 2679<HTML><HEAD><TITLE>Access control with httpd</TITLE></HEAD><BODY><P> <H2>A brief tutorial on access control and httpd</H2><P> <H2>Introduction</H2><P> Under most circumstances it is not necessary to worry about accesscontrol when serving web documents because you intend them to be readby anyone who cares to. There might be times, however, when you wouldlike to restrict access to your document to a subset of internet users.<P> In AFS these restrictions can be made using Access Control Lists(ACLs). When people request documents using HTTP there is (usually)no way of knowing the usernames of the requesters, let alone authenticatingthem, so access control has to be based on the identity of the requester's machine. Access control is accomplished through addingLimit clauses to <tt>.htaccess</tt> files in the appropriate directories.<P> <H2>The .htaccess file</H2><P> <TT>.htaccess</TT> files are used to make a server act differently when it enters a directory to retrieve a file. The attributes in a <TT>.htaccess</TT> file apply not only to the directory itself, but to each subdirectory as well. <tt>.htaccess</tt> files can be used fora number of purposes, but we are only concerned with access control inthis document. We will describe the two most commonly needed forms of access control in UW CS, and then briefly describe how access controllists can be constructed.<P> <H2>Restricting access to users on CS machines</H2><P> To restrict access to your documents to users on CS workstations, youcan put the following clause into the <tt>.htaccess</tt> file in theappropriate directory:<PRE><Limit GET>order deny,allowdeny from allallow from .cs.wisc.edu 128.105</Limit></PRE><P> This clause will allow access to any machine with a fully qualified domain name that ends with ``.cs.wisc.edu'' or an IP number that starts with ``128.105.''<P> <H2>Restricting access to users at UW Madison</H2><P> To restrict access to your documents to users at UW Madison, youcan put the following clause into the <tt>.htaccess</tt> file in theappropriate directory:<PRE><Limit GET>order deny,allowdeny from allallow from .wisc.edu 128.105 128.104 144.92</Limit></PRE><P> <H2>General use of access control</H2><P> If you want to restrict access to your documents to a specific subsetof machines you can do so by entering their names or IP numbers on the ``<tt>allow from</tt>'' line (see above). If you need a more detaileddescription you can read the <!WA0><A HREF="http://hoohoo.ncsa.uiuc.edu/docs/setup/access/Overview.html">NCSA httpd documentation on access control</A>.</BODY></HTML>⌨️ 快捷键说明
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