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From "Vincent Bray" <>
Subject Re: [users@httpd] Paranoia check regarding mod_proxy / mod_rewrite
Date Thu, 13 Sep 2007 06:46:38 GMT
On 13/09/2007, gb1071nx <> wrote:
> I've just recently compiled and installed the mod_rewrite and mod_proxy
> modules.   My specific reason for doing so is that I wanted to use AJAX
> calls between two internal (intranet) domains, but due to 'same origin'
> policy, could not.  Google told me that I can get around this by
> proxying. All sorts of PHP examples abounded, but 1) I'm a java
> programmer and 2) I don't want to write my own proxy code so 3) let's
> just use mod_rewrite!
> I've now got that all set up and working. My one domain successfully
> makes AJAX calls to the second, all through mod_rewrite.  But now I'm
> wanting to make absolutely certain of something:
> The *only* references I have to mod_proxy or mod_rewrite are the
> LoadModule commands, and my one mod_rewrite section:

Are you using apache 1.3? If not, you'll need mod_proxy_http loaded
too. If so, upgrade to 2.2 as the proxy module in 1.3 is obsolete and
missing several major features available in 2.x.

>  RewriteEngine On
>  RewriteRule ^/myproxy/(.*)/(.*)$ http://$1/foo/bar.jsp?x=$2 [P]
> I see this commented-out section as well:
> #<IfModule mod_proxy.c>
> #ProxyRequests On
> #
> #<Proxy *>
> #    Order deny,allow
> #    Deny from all
> #    Allow from
> #</Proxy>
> I'm just worried/wondering if my server is "secure", and that it's not
> acting as an open proxy?    Am I right in thinking that unless I
> explicitly turn on ProxyRequests, that merely loading the module does
> not cause it to become a proxy server?

You're correct that ProxyRequests defaults to off. However, your
rewrite rule has effectively created an open proxy, albeit one that
will always request /foo/bar.jsp?x=

> Secondly, could I use the <Proxy *> control block to limit even the
> reverse proxy to *only* accept requests from that single internal host?
> Or have I effectively done this, by making my RewriteEngine and
> RewriteRule directives within a virtual host block?

Yes and no. You can use a <Proxy block to restrict which host
addresses apache can make proxy requests to, and you can use <Location
to determine which clients can make requests to it.


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