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The Nessus system (wwwnessusorg) takes the idea behind nmap and extends it with deep application-level probes and a rich reporting infrastructure Running Nessus against a server is a quick way to perform a sanity check on the server s exposure The key to understanding Nessus is understanding its output The report will log numerous comments, from an informational level all the way up to a high level Depending on how your application is written and what other services you offer on your Linux system, Nessus may log false positives or seemingly scary informational notes Take the time to read through each one of them and understand what the output is, as not all of the messages necessarily reflect your situation For example, if Nessus detects that your system is at risk due to a hole in Oracle 8 but your server does not even run Oracle, more than likely, you have hit upon a false positive Although Nessus is open source and free, it is owned and managed by a commercial company, Tenable Network Security You can learn more about Tenable at www tenablesecuritycom
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We learned extensively about Wireshark and tcpdump in 11, where we used them to study the ins and outs of TCP/IP While we have seen these tools used only for troubleshooting, they are just as valuable for doing network security functions
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Raw network traces are the food that all of the tools listed in the preceding sections feed off of in order to gain insight into what your server is doing However, these tools don t have quite the insight into what your server is supposed to do like you do Thus, it is useful to be able to take network traces yourself and read through them to see if there is any questionable activity going on You may be surprised at what your server is doing! For example, if you are looking at a possible break-in, you may want to start a raw network trace from another Linux system that can see all of the network traffic of your questioned host By capturing all the traffic over a 24-hour period, you can go back and start applying filters to see if there is anything that shouldn t be there Extending the example, if the server is supposed to only handle web operations and SSH, with reverse Domain Name System (DNS) resolution turned off on both, take the trace and apply the filter not port 80 and not port 22 and not icmp and not arp Any packets that show up in the output are suspect
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In this chapter we covered the basics of network security as it pertains to Linux With the information here, you should have the knowledge you need in order to make an informed decision about the state of health of your server and decide what, if any, action is necessary to better secure it As has been indicated in other chapters, please do not consider this chapter a complete source of network security information Security as a field is constantly evolving and requires a careful eye toward what is new Be sure to subscribe to the relevant mailing lists, read the web sites, and, if necessary, pick up a book like Network Security: A Beginner s Guide by Eric Maiwald (McGraw-Hill/Osborne, 2003)
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Linux Administration: A Beginner s Guide
he need to be able map unfriendly numerical IP addresses into people-friendly format has been of paramount importance since the inception of the Internet in the 1970s Although this translation isn t mandatory, it does make the network much more useful and easy to work with for humans Initially, IP address to name mapping was done through the maintenance of a hoststxt file that was distributed via FTP to all the machines on the Internet As the number of hosts grew (starting back in the early 1980s), it was soon clear that a single person maintaining a single file of all of those hosts was not a scalable way of managing the association of IP addresses to hostnames To solve this problem, a distributed system was devised in which each site would maintain information about its own hosts One host at each site would be considered authoritative, and that single host address would be kept in a master table that could be queried by all other sites This is the essence of the Domain Name Service (DNS) If the information in DNS wasn t decentralized as it is, one other choice would be to have a central site maintaining a master list of all hosts (numbering in the tens of millions) and having to update those hostnames tens of thousands of times a day this alternative can quickly become overwhelming! Even more important to consider are the needs of each site One site may need to maintain a private DNS server because its firewall requires that local area network (LAN) IP addresses not be visible to outside networks, yet the hosts on the LAN must be able to find hosts on the Internet If you re stunned by the prospect of having to manage this for every host on the Internet, then you re getting the picture NOTE In this chapter, you will see the terms DNS server and name server used interchangeably Technically, name server is a little ambiguous because it can apply to any number of naming schemes that resolve a name to a number and vice versa In the context of this chapter, however, name server will always mean a DNS server, unless otherwise stated
We will discuss DNS in depth, so you ll have what you need to configure and deploy your own DNS servers for whatever your needs may be
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