25 July 2007 | 9,533 views

Dr. Morena – Firewall Configuration Testing Tool

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Dr.Morena is a tool to confirm the rule configuration of a Firewall.

The configuration of a Firewall is done by combining more than one rule. Sometimes a rule configuration may reside in a place other than the basic rule configuration place. In such a case, it is difficult to confirm whether it is an intended configuration by the system administrators. (Is an unnecessary hole open, or is a necessary hole open?).

We prepare a computer which has two network interface for this tool. Then, each network interface is connected to each of the network interfaces on both sides of the Firewall. The packet the source IP address and the destination IP address is forged and sent to the Firewall from one network interface. The packet which passed through the Firewall is confirmed in the other network interface. The rule of the Firewall is confirmed from the packets which passed through the Firewall, and the packets which didn’t pass.

This tool can check the rules without depending on the way of the Firewall is configured.

There is two modules in Dr. Morena – similar to the Firewal Tester (FTester). The first module is a check engine, and the second module is a packet list making engine.

Checker, which is the check engine, makes the check packet according to given packet information, and sends and receives this packet. Also, the check engine confirms whether the packet passed through the firewall, and returns the checked result.

Ideally, it is good to be able to check all packets of all services from all Internet Protocol addresses to all Internet Protocol addresses when we check the rules of a firewall. However, it is impossible to check all packets in appropriate time. Therefore, it is necessary to check the firewall by using only some limited packets. However, efficiency is bad in the check which uses packets chosen at random. Then, it is necessary to check the firewall by using the packet intended for an important address and the service listed in the security policy etc. by priority.

ListMaker, which is the check packet list making engine, lists necessary packets for the check, from information classified according to the importance degree.

You can download Dr. Morena here as an rpm file:

drmorena-0.2.0-1.i386.rpm

Or read more here.



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7 Responses to “Dr. Morena – Firewall Configuration Testing Tool”

  1. Sandeep Nain 25 July 2007 at 6:07 am Permalink

    Interesting…
    The concept behind the tool is new and different. I’m sure its worth trying…

    Actually name of the tool is also very interesting…

  2. morbid 25 July 2007 at 6:51 am Permalink

    There is another firewall ruleset testing tool fwtest.
    It is written in C/C++ and the test scripts are written in Python using scapy.

    From the manpage:

    The firewall test suite fwtest is a security auditing tool made up of
    two parts: the test control application fwtest and optionally one or
    two helper processes named fwagent. The test control application
    fwtest(1) starts up the python(1) interpreter with the given test
    script. The test script controls the packet data flow between two vir?
    tual interfaces A and B. For this purpose the python interpreter is
    extended by commands which support the construction and transfer of
    arbitrary IP-packets. In this way it is possible to stimulate a fire?
    wall (or other relaying network nodes) connected between the interfaces
    A and B.
    According to the interface-spec the virtual interfaces A and B are
    mapped on given physical interfaces on the same host the fwtest is run?
    ning or to an interface on a remote host which runs the application
    fwagent. For the remote access the fwtest establishes a control TLS-
    protected connection to the fwagent on the specified host. You may use
    a ca structure or a fingerprint file to authenticate the peer. The
    shell script keymager.sh is distributed with this software to help you
    generate the necessary keys for both (ca structure and fingerprint)
    variants. For both variants (one or two fwagents) the interfaces needs
    to be controlled by fwtest and fwagent on the link level. This is
    achieved by use of the berkely packet filter library pcap(3) for read?
    ing and The Network Library libnet(3) for writing of packets.

    It surely is wort a check, though it’s a bit complicated in the beginning. Unfortunately the only documentation at the moment are the manpages. Optionally “read the source luke” ;)

    Homepage

  3. Darknet 25 July 2007 at 9:06 am Permalink

    Thanks morbid! I’ll put that one in the archives for posting later.

  4. backbone 25 July 2007 at 8:53 pm Permalink

    I see that the package is linux one, does the program work onther win to? I see that is uses pcap, which was is ported on win also…

  5. Sandeep Nain 26 July 2007 at 12:04 am Permalink

    SecurityFriday (owner of teh tool) is saying that it only supports Linux based platforms and not windows. It would be nice to see this tool running on windows too..

  6. backbone 26 July 2007 at 6:41 pm Permalink

    well not everything in life is beautiful :)

    anyway I don’t think that many security advisor’s do firewall testing, this kind of tool can be useful to people that test new firewalls on the market, to see how well they work under different circumstances …

  7. Sandeep Nain 27 July 2007 at 12:04 am Permalink

    Backbone: thats true that not many security professionals use such tools but its always good to know about these tools and such articles definitely help those who are interested in knowing something new…