generate barcode in asp.net c# Analyzing Packets with Wireshark in Font

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Analyzing Packets with Wireshark
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Wireshark provides a graphical interface that you can use to capture and analyze packets, so it doesn t work directly on a server that s running without X. Also, you wouldn t want to install a complete GUI environment on your server just to run Wireshark. Instead of using it from your server directly, I recommend running it from a graphical workstation that is connected on the same network. It would show you the same information, anyway. To start Wireshark, as root install it using apt-get install wireshark. Then run the wireshark command from the run command box, which you can open from the graphical console with Ctrl+F2. To start a Wireshark capture session, select Capture Interfaces. From the pop-up window, select the interface that you want to use to perform your packet capture (see Figure 8-4). Click Start to start the packet capture.
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Figure 8-4. Before starting a Wireshark packet capture, select the interface you want to perform the packet capture on and then click Start. Wireshark now starts filling its buffers. You won t see any packet contents while this is happening. To see the content of the packet buffer, you need to click the Stop button. As a result, you ll see the window shown in Figure 8-5. From this window you can sort packets and see packet details. To sort packets, click one of the columns. By default, they re sorted on the number they came in with, but if you click the Source column, you can sort the packets by their source address; and if you click the Protocol column, you can sort the packets by the protocol that was used. Any of the columns in the results window can be clicked to filter the information.
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CHAPTER 8 MAKING A CONNECTION
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Figure 8-5. You can browse the contents of packets from this results window. Click one of the packets to display more detail. For every packet that s captured, you can analyze all its layers. The top part of the Wireshark capture results window displays just the list of packets, but after selecting a packet in the lower part, you ll see the packet s different headers. If you really need to see details of any of these parts, click the part you want to zoom in on to display its contents. You might even see passwords being sent in plain text over the network.
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Connecting Remotely with SSH
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The essence of SSH is its security, and public and private keys naturally play an important role in it. On first making contact, the client and the server exchange public and private keys. In this communication, the server creates a key based on its private key the so-called host key and uses it as its proof of identity. When connecting, the server sends its public key to the client. If this is the first time the client has connected to this host, the host replies with the message shown in Listing 8-19. Listing 8-19. Establishing an SSH Session with an Unknown Host root@ZNA:~# ssh 192.168.1.70 The authenticity of host '192.168.1.70 (192.168.1.70)' can't be established. RSA key fingerprint is fd:07:f6:ce:5d:df:6f:a2:84:38:c7:89:f1:3a:a6:34. Are you sure you want to continue connecting (yes/no) yes
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CHAPTER 8 MAKING A CONNECTION
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Warning: Permanently added '192.168.1.70' (RSA) to the list of known hosts. Password: Last login: Tue Jul 31 15:34:15 2007 from ida.lan root@RNA:~# If the client trusts that this is really the intended host, it should answer yes to the request, in which case the host is then added to the .ssh/known_hosts file in the home directory of the user who initiated the SSH session. The next time the client connects to the host, this file is checked to see if the host is already known. The check is based on the public key fingerprint of the host, which is a unique checksum related to the public key of the host. The connection is established only if this check matches the name and public key of the server that the client is connecting to. If these two pieces of data don t match, it s very likely that the host the client is trying to connect to isn t the intended host, and the connection is refused. Once the identity of the server you want to connect to is established, a secured channel is set up between the client and server. These secured channels are established by a session key, which is an encryption key that s the same on both the server and the client and encrypts all data sent between the two machines. The client and the server negotiate this session key based on their public keys. One of the things determined in this negotiation is the protocol that should be used. For example, session keys can use different encryption protocols such as 3DES, Blowfish, or IDEA. After establishing the secured channel, the user on the client is asked for credentials; if nothing is configured, a prompt asks the user to enter his user name and password. Alternatively, the user can authenticate with his public/private key pair, thus proving that he really is the user that he says he is, but some more things have to be configured before that can happen. All this might sound pretty complicated, but the nice thing is that the user doesn t notice any of it. The user just has to enter a user name and a password. If, however, you want to move beyond simple password-based authentication, it s necessary to understand what s happening.
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