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

Printing ECC200 in Objective-C 13: File Services

CHAPTER 13: File Services
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Figure 13 18. Enabling FTP sharing
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Once you have enabled FTP sharing, you can connect to the FTP share by clicking Go and then Connect to Server in the Finder. From here, you can enter ftp://ipaddress in the Server Address field (as shown in Figure 13 19). Once you have entered the address, click Connect.
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Figure 13 19. Connecting over FTP
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Attempting to edit data in files via FTP will result in frustration. When folders are accessed by FTP using the Finder, the files are mounted as read-only to your user account and cannot be modified. If you need to write to this folder, then you will want to connect to it using an FTP client such as Fetch or Transmit. FTP security is a bit thin. FTP bounce attacks allow users to establish a connection between FTP servers and an arbitrary port on another system while connected to the
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CHAPTER 13: File Services
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server. This connection can then be used to bypass access controls that would otherwise apply. FTP traffic is also unencrypted, which can lead to the exposure of passwords. There is also a mode for FTP known as PASV, which allows FTP to work with firewalls. PASV sessions can become hijacked by other users using a PASV theft attack. In short, there are a lot of other solutions to FTP, such as web-based browsing through Rumpus or WebDAV, that can be used. Consider replacing FTP with one of them in order to eliminate the use of FTP in your environment.
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In larger environments, system administrators have been grappling with various methods to handle file permissions for a good while now. Over the years, the Mac administrative community has developed a few different methodologies as standard practices for managing permissions. In this section, we ll touch on these permissions methodologies, or models, to give you a better understanding about the ways that filesharing permissions policies can be implemented on Mac networks. Discretionary access control (DAC) allows data owners to administer file permissions themselves. In a DAC model, administrators often spend less time assigning permissions (which often means spending more time restoring accidentally deleted files). Discretionary access control systems permit users to entirely determine the access granted to their resources, which means they can (through accident or malice) give access to unauthorized users. The owner of any resource has access to control the privileges to that resource. There are often no security checks ensuring malicious code is not distributed or that the owner of a file or folder is well trained enough to be assigning permissions in the first place. This is the default model and, unfortunately, the most common model for controlling permissions. However, in addition to time spent on restoring deleted files, DAC is also limited in that security breaches can be caused when users who do not understand the appropriate access levels for files within their organization assign permissions that cause security breaches. Mandatory access control (MAC) is a model that can augment or even replace DAC for file permissions. MAC s most important feature involves denying users full control over the access to resources that they create. The system security policy (as set by the administrator) entirely determines the access rights granted, and a user cannot grant less restrictive access to their resources than the administrator specifies. MAC has the goal of defining an architecture that requires the evaluation of all securityrelated information and making decisions based on what is done with data and the various data types in use in your organization. MAC is a strict hierarchical model usually associated with governments. All objects are given security labels known as sensitivity labels, and are classified accordingly. All users are then given specific security clearances as to what they are allowed to access. A common term when working with MAC is lattice, which describes the upper and lower bounds of a user s access permission. In other words, a user s access differs at different levels. Role-based access control (RBAC) involves limiting access to files based on the responsibilities of a user. When using a role-based security model for access controls,
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