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Full Discussion: firewall vs. closing ports
Special Forums Cybersecurity firewall vs. closing ports Post 14922 by adam_crosby on Friday 8th of February 2002 01:16:24 AM
Old 02-08-2002
firewall vs. closing ports
This may be kind of a stupid question, but here goes:
Say I'm running a FreeBSD webserver (w/apache). I've managed to close ALL open ports (including SSH/telnet and portmapper), excepting '80' that apache is listening on. A netstat -a shows me nothing open.
Discounting DoS/DDoS or holes in apache, is there really a reason to run a firewall on a box like this? If nothing is listening on any ports but 80, what function will a firewall perform (like ipf (pf now I guess))? Some super-sekrit port-opening prevention?
The TCP/IP stack isn't really vulnerable to say, the Ping of Death or something like, and there are no sessions to hijack (w/this particular website), so I'm at a loss as to what a firewall would do. Or am I just beating a dead horse, so to speak?
 

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LEARN ABOUT SUNOS

apache

apache(1M)						  System Administration Commands						apache(1M)

NAME

       apache - Apache hypertext transfer protocol server overview

DESCRIPTION

	apache	consists  of a main server daemon, loadable server modules, some additional support utilities, configuration files, and documenta-
       tion.

FILES

       The apache HTTPD server is integrated with Solaris.

       The following files specify the installation locations for apache:

       /etc/apache	       Contains server configuration files.

			       A newly-installed server must be manually configured before use. Typically this involves copying httpd.conf-example
			       to the httpd.conf file and making local configuration adjustments.

       /usr/apache/bin	       Contains the httpd executable as well as other utility programs.

       /usr/apache/htdocs      Contains  the  Apache  manual  in HTML format. This documentation is accessible by way of a link on the server test
			       page that gets installed upon fresh installation.

       /usr/apache/include     Contains the Apache header files, which are needed for building various optional server extensions with apxs(8)

       /usr/apache/jserv       Contains documention for the mod_jserv java servlet module. Documention can be read with a web  browser	using  the
			       url:

			       file:/usr/apache/jserv/docs/index.html

       /usr/apache/libexec     Contains loadable modules (DSOs) supplied with the server. Any modules which are added using apxs(8)are also copied
			       into this directory.

       /usr/apache/man	       Contains man pages for the server, utility programs, and mod_perl.

			       Add this directory to your MANPATH to read the Apache man pages. See NOTES.

       /usr/apache/perl5       Contains the modules and library files used by the mod_perl extension to Apache.

       /var/apache/cgi-bin     Default location for the CGI scripts.

			       This can be changed by altering the httpd.conf file and restarting the server.

       /var/apache/htdocs      Default document root.

			       This can be changed by altering the httpd.conf file and restarting the server.

       /var/apache/icons       Icons used by the server.

			       This normally shouldn't need to be changed.

       /var/apache/logs        Contains server log files.

			       The formats, names, and locations of the files in this directory can be altered by various configuration directives
			       in the httpd.conf file.

       /var/apache/proxy       Directory used to cache pages if the caching feature of mod_proxy is enabled in the httpd.conf file.

			       The location of the cache can also be changed by changing the proxy configuration in the httpd.conf file.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWapchr 		   |
       +-----------------------------+-----------------------------+
       |			     |SUNWapchu 		   |
       +-----------------------------+-----------------------------+
       |			     |SUNWapchd 		   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

       http://www.apache.org

NOTES

       In addition to the documentation and man pages included with Solaris, more information is available at http://www.apache.org

       The  Apache  man pages are provided with the programming modules. To view the manual pages for the Apache modules with the man command, add
       /usr/apache/man to the MANPATH environment  variable. See man(1) for  more information. Running catman(1M) on the Apache  manual  pages	is
       not supported.

SunOS 5.10							    8 Aug 2000								apache(1M)
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