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309 lines
8.3 KiB
HTML
309 lines
8.3 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HTML>
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<HEAD>
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<TITLE>Apache module mod_access</TITLE>
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</HEAD>
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<!-- Background white, links blue (unvisited), navy (visited), red (active) -->
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<BODY
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#000080"
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ALINK="#FF0000"
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>
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<!--#include virtual="header.html" -->
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<H1 ALIGN="CENTER">Module mod_access</H1>
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<P>
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This module is contained in the <CODE>mod_access.c</CODE> file, and
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is compiled in by default. It provides access control based on client
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hostname or IP address.
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</P>
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<UL>
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<LI><A HREF="#allow">allow</A>
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<LI><A HREF="#allowfromenv">allow from env=</A>
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<LI><A HREF="#deny">deny</A>
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<LI><A HREF="#denyfromenv">deny from env=</A>
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<LI><A HREF="#order">order</A>
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</UL>
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<HR>
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<H2><A name="allow">allow directive</A></H2>
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<P>
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<!--%plaintext <?INDEX {\tt allow} directive> -->
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<A
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HREF="directive-dict.html#Syntax"
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REL="Help"
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><STRONG>Syntax:</STRONG></A> allow from <EM>host host ...</EM><BR>
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<A
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HREF="directive-dict.html#Context"
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REL="Help"
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><STRONG>Context:</STRONG></A> directory, .htaccess<BR>
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<A
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HREF="directive-dict.html#Override"
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REL="Help"
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><STRONG>Override:</STRONG></A> Limit<BR>
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<A
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HREF="directive-dict.html#Status"
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REL="Help"
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><STRONG>Status:</STRONG></A> Base<BR>
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<A
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HREF="directive-dict.html#Module"
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REL="Help"
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><STRONG>Module:</STRONG></A> mod_access
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</P>
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<P>
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The allow directive affects which hosts can access a given directory.
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<EM>Host</EM> is one of the following:
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</P>
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<DL>
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<DT><CODE>all</CODE>
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<DD>All hosts are allowed access
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<DT>A (partial) domain-name
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<DD>Hosts whose names match, or end in, this string are allowed access.
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<DT>A full IP address
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<DD>An IP address of a host allowed access
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<DT>A partial IP address
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<DD>The first 1 to 3 bytes of an IP address, for subnet restriction.
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<DT>A network/netmask pair (<STRONG>Apache 1.3 and later</STRONG>)
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<DD>A network a.b.c.d, and a netmask w.x.y.z. For more fine-grained subnet
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restriction. (i.e. 10.1.0.0/255.255.0.0)
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<DT>A network/nnn CIDR specification (<STRONG>Apache 1.3 and later</STRONG>)
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<DD>Similar to the previous case, except the netmask consists of nnn
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high-order 1 bits. (i.e. 10.1.0.0/16 is the same as 10.1.0.0/255.255.0.0)
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</DL>
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<P>
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Example:
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</P>
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<BLOCKQUOTE><CODE>allow from .ncsa.uiuc.edu</CODE></BLOCKQUOTE>
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<P>
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All hosts in the specified domain are allowed access.
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</P>
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<P>
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Note that this compares whole components; <CODE>bar.edu</CODE>
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would not match <CODE>foobar.edu</CODE>.
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</P>
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<P>
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See also <A HREF="#deny">deny</A>, <A HREF="#order">order</A>, and
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<A HREF="mod_browser.html#browsermatch">BrowserMatch</A>.
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</P>
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<P>
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<A name="allowfromenv"><STRONG>Syntax:</STRONG> allow from env=<EM>variablename</EM></A><BR>
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<A
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HREF="directive-dict.html#Context"
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REL="Help"
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><STRONG>Context:</STRONG></A> directory, .htaccess<BR>
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<A
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HREF="directive-dict.html#Override"
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REL="Help"
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><STRONG>Override:</STRONG></A> Limit<BR>
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<A
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HREF="directive-dict.html#Status"
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REL="Help"
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><STRONG>Status:</STRONG></A> Base<BR>
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<A
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HREF="directive-dict.html#Module"
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REL="Help"
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><STRONG>Module:</STRONG></A> mod_access<BR>
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<A
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HREF="directive-dict.html#Compatibility"
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REL="Help"
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><STRONG>Compatibility:</STRONG></A> Apache 1.2 and above
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</P>
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<P>
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The allow from env directive controls access to a directory by the
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existence (or non-existence) of an environment variable.
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</P>
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<P>
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Example:
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</P>
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<BLOCKQUOTE><PRE>
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BrowserMatch ^KnockKnock/2.0 let_me_in
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<Directory /docroot>
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order deny,allow
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deny from all
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allow from env=let_me_in
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</Directory>
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</PRE></BLOCKQUOTE>
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In this case browsers with the user-agent string <TT>KnockKnock/2.0</TT> will
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be allowed access, and all others will be denied.
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<P>
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See also <A HREF="#denyfromenv">deny from env</A>
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and <A HREF="#order">order</A>.
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</P>
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<HR>
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<H2><A name="deny">deny directive</A></H2>
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<P>
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<!--%plaintext <?INDEX {\tt deny} directive> -->
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<A
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HREF="directive-dict.html#Syntax"
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REL="Help"
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><STRONG>Syntax:</STRONG></A> deny from <EM>host host ...</EM><BR>
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<A
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HREF="directive-dict.html#Context"
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REL="Help"
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><STRONG>Context:</STRONG></A> directory, .htaccess<BR>
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<A
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HREF="directive-dict.html#Override"
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REL="Help"
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><STRONG>Override:</STRONG></A> Limit<BR>
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<A
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HREF="directive-dict.html#Status"
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REL="Help"
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><STRONG>Status:</STRONG></A> Base<BR>
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<A
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HREF="directive-dict.html#Module"
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REL="Help"
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><STRONG>Module:</STRONG></A> mod_access
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</P>
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<P>
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The deny directive affects which hosts can access a given directory.
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<EM>Host</EM> is one of the following:
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</P>
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<DL>
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<DT><CODE>all</CODE>
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<DD>all hosts are denied access
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<DT>A (partial) domain-name
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<DD>host whose name is, or ends in, this string are denied access.
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<DT>A full IP address
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<DD>An IP address of a host denied access
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<DT>A partial IP address
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<DD>The first 1 to 3 bytes of an IP address, for subnet restriction.
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<DT>A network/netmask pair (<STRONG>Apache 1.3 and later</STRONG>)
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<DD>A network a.b.c.d, and a netmask w.x.y.z. For more fine-grained subnet
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restriction. (i.e. 10.1.0.0/255.255.0.0)
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<DT>A network/nnn CIDR specification (<STRONG>Apache 1.3 and later</STRONG>)
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<DD>Similar to the previous case, except the netmask consists of nnn
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high-order 1 bits. (i.e. 10.1.0.0/16 is the same as 10.1.0.0/255.255.0.0)
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</DL>
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<P>
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Example:
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</P>
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<BLOCKQUOTE><CODE>deny from 16</CODE></BLOCKQUOTE>
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<P>
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All hosts in the specified network are denied access.
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</P>
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<P>
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Note that this compares whole components; <CODE>bar.edu</CODE>
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would not match <CODE>foobar.edu</CODE>.
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</P>
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<P>
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See also <A HREF="#allow">allow</A> and <A HREF="#order">order</A>.
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</P>
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<P>
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<A name="denyfromenv"><STRONG>Syntax:</STRONG> deny from env=<EM>variablename</EM></A><BR>
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<A
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HREF="directive-dict.html#Context"
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REL="Help"
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><STRONG>Context:</STRONG></A> directory, .htaccess<BR>
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<A
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HREF="directive-dict.html#Override"
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REL="Help"
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><STRONG>Override:</STRONG></A> Limit<BR>
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<A
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HREF="directive-dict.html#Status"
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REL="Help"
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><STRONG>Status:</STRONG></A> Base<BR>
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<A
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HREF="directive-dict.html#Module"
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REL="Help"
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><STRONG>Module:</STRONG></A> mod_access<BR>
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<A
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HREF="directive-dict.html#Compatibility"
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REL="Help"
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><STRONG>Compatibility:</STRONG></A> Apache 1.2 and above
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</P>
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<P>
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The deny from env directive controls access to a directory by the
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existence (or non-existence) of an environment variable.
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</P>
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<P>
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Example:
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</P>
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<BLOCKQUOTE><PRE>
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BrowserMatch ^BadRobot/0.9 go_away
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<Directory /docroot>
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order allow,deny
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allow from all
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deny from env=go_away
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</Directory>
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</PRE></BLOCKQUOTE>
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In this case browsers with the user-agent string <TT>BadRobot/0.9</TT> will
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be denied access, and all others will be allowed.
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<P>
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See also <A HREF="#allowfromenv">allow from env</A>
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and <A HREF="#order">order</A>.
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</P>
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<HR>
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<H2><A name="order">order directive</A></H2>
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<P>
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<!--%plaintext <?INDEX {\tt order} directive> -->
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<A
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HREF="directive-dict.html#Syntax"
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REL="Help"
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><STRONG>Syntax:</STRONG></A> order <EM>ordering</EM><BR>
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<A
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HREF="directive-dict.html#Default"
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REL="Help"
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><STRONG>Default:</STRONG></A> <CODE>order deny,allow</CODE><BR>
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<A
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HREF="directive-dict.html#Context"
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REL="Help"
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><STRONG>Context:</STRONG></A> directory, .htaccess<BR>
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<A
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HREF="directive-dict.html#Override"
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REL="Help"
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><STRONG>Override:</STRONG></A> Limit<BR>
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<A
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HREF="directive-dict.html#Status"
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REL="Help"
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><STRONG>Status:</STRONG></A> Base<BR>
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<A
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HREF="directive-dict.html#Module"
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REL="Help"
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><STRONG>Module:</STRONG></A> mod_access
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</P>
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<P>
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The order directive controls the order in which <A HREF="#allow">allow</A> and
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<A HREF="#deny">deny</A> directives are evaluated. <EM>Ordering</EM> is one
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of
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</P>
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<DL>
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<DT>deny,allow
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<DD>the deny directives are evaluated before the allow directives. (The
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initial state is OK.)
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<DT>allow,deny
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<DD>the allow directives are evaluated before the deny directives. (The
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initial state is FORBIDDEN.)
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<DT>mutual-failure
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<DD>Only those hosts which appear on the allow list and do not appear
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on the deny list are granted access. (The initial state is irrelevant.)
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</DL>
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<P>
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<STRONG>Note that in all cases every <CODE>allow</CODE> and <CODE>deny</CODE>
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statement is evaluated, there is no "short-circuiting".</STRONG>
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</P>
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<P>
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Example:
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</P>
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<BLOCKQUOTE><CODE>
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order deny,allow<BR>
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deny from all<BR>
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allow from .ncsa.uiuc.edu<BR>
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</CODE></BLOCKQUOTE>
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<P>
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Hosts in the ncsa.uiuc.edu domain are allowed access; all other hosts are
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denied access.
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</P>
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<!--#include virtual="footer.html" -->
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</BODY>
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</HTML>
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