SNORT Feed the Pig Vicki Insixiengmay Jon Krieger.

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Intrusion Detection Systems (IDS)

Presentation transcript:

SNORT Feed the Pig Vicki Insixiengmay Jon Krieger

What is SNORT? A so-called Intrusion Detection System (IDS) Analyzes IP-Network traffic online and records packets Reduces the risk of intrusion

What is SNORT? Five major components: Packet capturing mechanism Snort relies on an external packet capturing library (libpcap) to sniff packets Packets are passed into the packet decoder. Translates specific protocol elements into an internal data structure. After the decode is completed, traffic is handled by the preprocessors. Any number of pluggable preprocessors either examine or manipulate packets before handing them to the next component: the detection engine.

What is SNORT? The detection engine performs simple tests on a single aspect of each packet to detect intrusions. The last component is the output plugins Generates alerts to present suspicious activity

Snort Component Dataflow

What does Snort do? Snort uses a flexible rules language to describe traffic that it should collect or pass, including a detection engine that utilizes a modular plugin architecture. Snort has a real- time alerting capability. Alerts mechanisms for syslog, user specified files, a UNIX socket, or WinPopup messages to Windows clients using Samba's smbclient.

Packet Decoder First internal component of Snort that a sniffed packet encounters. Purpose: To strip off the various headers. It works by decoding up the TCP/IP stack, and placing the packet in a data structure. Packets are then routed to the preprocessors.

Preprocessors Perform two fundamental functions: Manipulate packets so the detection engine can properly analyze them OR Examine traffic for suspicious use that cannot be discovered by signature detection alone. After traffic is run through the preprocessors, it is sent on to the detection engine.

Detection Engine Responsible for the actual signature detection. Snort rules are loaded into the detection engine and are categorized in a tree-like data structure, which minimizes the number of tests the detection engine has to perform to discover malicious activity. Snort writes intrusion data to any number of output plugins.

Output Plugins The means Snort has to get data from the detection engine to user. Snort can be configured with multiple output plugins to better facilitate intrusion data management. Output plugins can range from simple comma-delimited output to complex relational database output.

Primary Uses Snort has three primary uses: Sniffer Mode Reads packets off of the network and displays them in continuous stream on the screen./snort -v Packet Logger Mode Records/logs packets to disk../snort –dev –l./log

Primary Uses Network Intrusion Detection System (NIDS) mode Analyzes network traffic for matches against user-defined rule set and performs actions based on what is shown./snort –dev –l./log –h /23 –c snort.conf

Rules Rule Header Action, Protocol, IP Addresses and Ports Rule Option Alert Messages and Items to Look for alert tcp any any -> / (content:"| a5|"; msg:"mountd access";)

References