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netstat -a command to find out what ports are open on that system.
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If NMAP is not on your system, you can get it in a number of ways. The easiest way is to check the usual methods you use to update your distributions: apt-get, yum, up2date, emerge, and so on, for an NMAP package in the form used by your distribution. If you cannot find one using this method or want to get the latest version of NMAP it is available in source form, RPMs, , and binaries on the NMAP Web site at http://www.insecure.org/nmap. If you get the source archive, then compiling NMAP is a simple process. Unpack the archive, and change into the resulting directory. When compiling, you may want to specify some configure variables, such as the location of your OpenSSL installation that is used by NMAP You can do . that by specifying configure flags, as follows: puppy# ./configure --openssl=/path/to/openssl Then make and install NMAP by entering the following: puppy# make && make install By default NMAP will be installed to /usr/local/bin, but you can also override this during the ./configure process using the -prefix option. NMAP is a command-line tool and comes with a front end that works in X. I will show running NMAP from the command line. You can run NMAP by typing the command in Listing 6-19. Listing 6-19. Basic NMAP Scan puppy# nmap 192.168.0.1 This will scan the host 192.168.0.1 (or any other IP address you specify) using a TCP SYN scan. (The example assumes you are logged in as root.) It would return something like Listing 6-20.
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CHAPTER 6 s USING TOOLS FOR SECURITY TESTING
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Listing 6-20. NMAP Output Starting nmap 3.50 ( http://www.insecure.org/nmap/ ) at 2004-03-17 16:20 EST Interesting ports on host.yourdomain.com (192.168.0.1): (The 1657 ports scanned but not shown below are in state: closed) PORT STATE SERVICE 80/tcp open http 8080/tcp open http-proxy Nmap run completed -- 1 IP address (1 host up) scanned in 3.930 seconds This response shows it scanned 192.168.0.1 and found that ports 80 and 8080 were open, probably indicating this system is running a Web server and a proxy server. NMAP also has a lot of additional types of scans, other options that modify your scans, and ways to scan multiple hosts or even whole subnets. The NMAP command line breaks down into three sections. puppy# nmap [scan type(s)] [options] <host(s) or network list> I will cover each section of the command line separately. The first section of the NMAP command line is scan types. Each scan type is prefixed with a hyphen (-); for example, you can use -sS for the TCP SYN stealth port scan, which is the default if you run NMAP as root. Several possible scan types address different user requirements. Table 6-5 shows the most common types, and I will go through each of them and explain their purposes. You can use other scan types that you find out about through the NMAP man page. Table 6-5. NMAP Scan Types
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-sS -sT -sU -sP
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TCP SYN stealth port scan (default for root user) TCP connect() port scan (default for normal user) UDP port scan Ping scan
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The three basic types of NMAP scan most useful to you will be the types -sS, -sT, and -sU. The first two are TCP-based based scans, each of which approaches the scanning process quite differently, and the last is UDP based. The first TCP type is -sS, or TCP SYN scanning, also known as stealth scanning. In this type of scan, NMAP sends a SYN packet to the target port and requests a connection. The target will respond with a SYN/ACK packet telling NMAP whether the port is open. When NMAP receives that SYN/ACK packet, it sends an RST packet rather than responding with an ACK packet to the target and terminates the connection. The objective is that by not making a full three-way connection to the target, the scan is stealthy in nature. These days, however, most IDS7 systems such as Snort detect SYN scans, and many network devices such as firewalls and packet filters reject SYN packets.
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