zebra barcode printer c# 13: File Services in Objective-C

Encoder Data Matrix 2d barcode in Objective-C 13: File Services

The DAVE Network preference pane is where you ll configure how your system is perceived by Windows and Samba systems in the domain environment. This includes the computer name, which is how other Windows systems see your computer (using NetBIOS); the description, which is a simple text field; and the workgroup. The workgroup setting (see Figure 13 16) is meant to allow systems of a like type to see each other, making it a discovery mechanism. Although Windows computers can see the computers in their workgroup, they can also see computers in other workgroups.

By clicking the Policies tab of the DAVE Network preference pane, you will be able to configure signing and the acceptable authentication levels for the Samba sharing. A man-in-the-middle attack is when an attacker is able to read or modify communications

between two parties. Digital signing for SMB, or SMB signing, allows you to protect against man-in-the-middle attacks by placing a digital signature in each packet. If the packet is then intercepted in transit, the digital signature will be altered, and the parties will drop the connection. However, digital signing only mitigates the threat of data being modified while in transit. A man in the middle attack that does not alter data can go undetected. SMB signing is one of the best ways to protect SMB traffic. Many corporate security policies require SMB signing for communications over SMB to their file servers, a default option for Windows domain controllers since Windows 2003. SMB authentication primarily occurs over LANMAN, NTLMv1, and NTLMv2. LANMAN used a weak (by modern standards) authentication protocol known as LM Hash. NTLMv1 was a great step forward and represented the introduction of a challengeresponse protocol. With NTLMv1, the server authenticates the client by sending a random number, known as the challenge. The client uses the challenge and a password, or ticket, known by both the client and the server. The client identity then is configured using the result of combining the two. The server verifies that the client has calculated the correct result and verifies the identity of the client. NTLMv2 is also a challengeresponse protocol, but with more steps involved to enhance the security of the challenge-response process. Of these, NTLMv2 is by far the most secure; however, it has been replaced in many situations by Kerberos. If Kerberos is available, then the DAVE client will always use it. The Policies screen of the DAVE Network preference pane (shown in Figure 13 17) allows you to set the minimum acceptable security level. The LAN Manager Authentication Level setting should be set to the highest possible, eliminating all other protocols from the options available to DAVE for authentication. If you are in an environment that supports NTLMv2, then you should be using NTLMv2 response only. Otherwise, the order of security for these options, from most secure to least secure, is as follows: Send NTLMv2 Response Only Send NTLM Response Only Send LM & NTLM Responses Send LM & NTLM

DAVE is a great tool to allow the Mac to thrive in a more corporate Microsoft-based environment. There are also some nice file-sharing features in DAVE, which make it a must in testing if you are performing file sharing in a Windows-based environment. If the features make it worth obtaining a third-party package, then look into volume licensing it.

FTP is a very old protocol, much older than SMB and AFP. FTP is most commonly used to transfer files over the Internet. However, FTP does not encrypt data, and should not be used as a sharing protocol unless absolutely required (and if you think it s absolutely required, we urge you to continue to research other means because there usually is a better way). To enable FTP, click the Sharing preference pane, and click the Options button. Select the Share Files and Folders Using FTP box (see Figure 13 18).