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The Apache HTTP Server Reference Manual
by Apache Software Foundation
Paperback (6"x9"), 862 pages
ISBN 9781906966034
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13.10  Watching Your Logs

To keep up-to-date with what is actually going on against your server you have to check the Log Files (p. 127). Even though the log files only reports what has already happened, they will give you some understanding of what attacks is thrown against the server and allow you to check if the necessary level of security is present.

A couple of examples:

grep -c "/jsp/source.jsp?/jsp/ /jsp/source.jsp??" access_log
grep "client denied" error_log | tail -n 10

The first example will list the number of attacks trying to exploit the Apache Tomcat Source.JSP Malformed Request Information Disclosure Vulnerability3 , the second example will list the ten last denied clients, for example:

[Thu Jul 11 17:18:39 2002] [error] [client foo.example.com] client denied by server configuration: /usr/local/apache/htdocs/.htpasswd

As you can see, the log files only report what already has happened, so if the client had been able to access the .htpasswd file you would have seen something similar to:

foo.example.com - - [12/Jul/2002:01:59:13 +0200] "GET /.htpasswd HTTP/1.1"

in your Access Log (p. 127). This means you probably commented out the following in your server configuration file:

<Files ~ "^\.ht">
Order allow,deny
Deny from all

ISBN 9781906966034The Apache HTTP Server Reference ManualSee the print edition