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5 Full Content Data
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Full content data is the most flexible form of network-based information It is a rich form of evidence offering detail and opportunities seldom found elsewhere Once full content data has been acquired, analysts can derive session, alert, and statistical data if necessary In many cases it is impossible to collect full content data on all services simultaneously In other cases it is possible, but only when deploying specialized hardware and software In most cases, it's possible to collect some full content data, even if narrowly focused on a specific protocol or IP address This chapter shares a few tips on how to collect and interpret that full content data I have always found examples to be more informative than lists of options, so where appropriate I include examples based on the reference intrusion model presented in 4 Most of the tool explanations in Part II use the two capture files from 4, so you can follow along after downloading sf1lpc and em0lpc from the book's Web site at http://wwwtaosecuritycom Full content data offers two compelling features that make collecting it worthwhile: granularity and application relevance Granularity refers to the collection of every nuanced bit in a packet If an intruder uses a covert channel application like Stegtunnel to communicate using the IP ID or TCP sequence number fields, that information is preserved in full content data Some may argue that collecting packet headers achieves the same goal What if the intruder embeds commands in a series of TCP options at the end of the TCP header Will a collection tool catching the first n bytes always grab the relevant information For this reason I advocate using full content collection, where possible, to save entire packets I leave summarizing conversations to the discussion of session data in 7
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Stegtunnel is available at http://wwwsynacklabsnet/projects/stegtunnel/ Craig Rowland wrote about stealthy communications in 1996 in "Covert Channels in the TCP/IP Protocol Suite," archived at http://wwwfirstmondaydk/issues/issue2_5/rowland/
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The second aspect of full content data, application relevance, refers to saving the information passed above the transport layer When analysts have access to the data exchanged between applications, a whole new world of investigation is possible While session data is excellent for recording the fact that a conversation took place, access to the content of that communication is invaluable When full content application data is unencrypted, it's possible to fully understand the nature of an interaction between two computers Analysts who once had only packet headers and cared when they saw an odd TCP flag now spend more time looking at an intruder's actions in a Telnet session Rather than count sequence numbers, they inspect FTP transfers and rebuild the binaries downloaded by suspicious parties The tools in this chapter emphasize both aspects of full content data I'll share how to collect this data, plus how to review it in various forms I approach this chapter with the hope of finding the best tool for a specific task These pages address the "core tools" used to collect and examine full content data 6 presents supplementary tools that enhance full content data collection and manipulation
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Assuming you've taken the steps discussed in 3, you have access to traffic on the wire or in the air Collection and storage of that traffic is the next step In this chapter I assume you're working in a UNIX environment, although some of the more popular tools sport Windows versions The test platform for Part II is FreeBSD 49 RELEASE with security fixes applied To promote your ability to try these examples, in general I restrict my discussion to versions of tools packaged with FreeBSD 49 RELEASE In some cases I opt for an alternative method to install the software If an application offers a very useful feature or security fix not found in the version packaged with FreeBSD 49 RELEASE, I'll add a newer packaged version If a newer packaged version doesn't exist, I'll build the application using the FreeBSD ports tree If the application exists only in source code form, I'll build it from source
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Here's a note on FreeBSD versions for those who wish to know my opinion on such matters For security appliances like firewalls or sensors, I like to track the "security release" versions, meaning the RELEASE plus any security fixes For development systems I use STABLE I don't run CURRENT (meaning non-RELEASE software) because I don't have the time to track down problems with the operating system At the moment I'm writing this, I am running FreeBSD 521 (technically not yet STABLE) on production machines, because 521 was published as a RELEASE
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Remember that any software that works on FreeBSD is bound to work on Linux Most will even work on Mac OS X Don't let the FreeBSD-specific nature of the tool descriptions scare you It's easy to date a book by looking at the versions of software it discusses When reading about the tools, concentrate on the types of data they collect and not the tool's version I selected each of the applications in Part II to meet a specific NSM need As certain tools grow in capability, they may render competing applications redundant The focus of Part II is on the operational use of NSM tools I try to give you the information needed to use a tool effectively, but I don't explain every option One benefit of the UNIX way of doing business is the inclusion of manual pages with most open source software Once you know the general capabilities of a tool, its manual page closes many knowledge gaps In some cases I show only one or two uses for an application, although it or a tool packaged with it offers dozen of other features This is a limitation of the number of pages allotted for this book, so I encourage you to find a tool that looks promising, check its Web site, and read any associated documentation In all cases the names shown within less than (<) and greater than (>) symbols, for example, <capfilelpc> , indicate placeholders for the actual name of a file on your system; delete the < and > symbols and replace the name with one of your own
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