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If you are an administrator who must provide shell accounts for your user base, hopefully you ve already put a decent amount of thought into securing them Even with only a default shell, a non-administrative user has a decent amount of access In environments where all users are trusted, this might not necessarily impose a huge concern to administrators, but it is likely the case that security in this respect is overlooked In environments where the user base is unknown or cannot be trusted, the integrity of the system must be carefully protected from your users themselves One problem is that OS X does not have an extremely strong reputation in the security community when it comes to local privilege-escalation vulnerabilities A privilege-escalation vulnerability is an exploit employed by a user to gain access to system resources outside of those that have been provisioned to that user.

properties as virtual, the end result is that we get proxies that support just lazy loading, not change tracking.

In many cases, this entails a standard user gaining root privileges, and thereby having complete control of the system In a perfect world this would never happen Unfortunately we don t live in a perfect world, and a quick Google search for the term os x local privilege escalation reveals numerous security advisories for a decent number of familiar applications: AppleScript, Apple Remote Desktop, Disk Utility, System Preferences, to name a few Even these legitimate applications have in the past provided avenues for users to subvert the system Fortunately, Apple has addressed each of these specific vulnerabilities through various security updates Even acknowledging that, it s a bit na ve to think that there isn t still a vulnerability out there that could potentially be exploited.

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int domainSpecificSetting = permissions.getPermission( ApplicationPermissions.PERMISSION_SERVER_NETWORK, "securesite.example.com");

Suppose your model looks like the one in Figure 8-5. In this model, the Name property is a complex type.

If you are an OS X administrator and need to provide shell access for your user base, consider sandboxing the user s shell to reduce the amount of tools that they have access to and thereby reducing the surface area for attack Sandboxing doesn t only apply for user shell access though In OS X, the sftp service is directly tied to ssh In fact, they are provided by the same daemon The main concern with using OS X as an sftp platform is that the daemon is not change-rooted at all What this means is that users could easily walk all over your file system You cannot limit sftp access for a user to the user s own home directory, for example.

Starting with device software version 4.7, you can also provide a boolean indicating whether to ignore the current setting of the firewall. Firewalls are discussed in more detail later in this chapter; for now, be aware that unless you specify true here, ApplicationPermissionsManager will allow the firewall setting to override the actual permission that the user has set. You generally do want to take the firewall into account, since you likely care most about the actual behavior for a request you would make and not just what is shown on the permissions screen. Only set true here if you need to know the actual underlying setting.

Figure 8-5. A model for an employee. The Name property is a complex type composed of FirstName and LastName. Complex types are supported with POCO. Simply create a class for the complex type and use this class as the type for the property. Only classes are supported. There is no current support for struct as a complex type. The code in Listing 8-6 illustrates using the Name class for the complex type representing the employee s FirstName and LastName. Listing 8-6. Using a complex type with POCO class Program { static void Main(string[] args) { RunExample(); } static void RunExample() { using (var context = new EFRecipesEntities()) { context.Employees.AddObject(new Employee { Name = new Name { FirstName = "Annie", LastName = "Oakley" }, Email = "aoakley@wildwestshow.com" });

While that can certainly be their starting point, they have full access to go anywhere that standard user s can go: your Applications folder, your /System folder, and portions of /etc are also exposed While these resources should be impervious to damage from these users due to standard POSIX permissions, it still represents a security risk to the loss in confidentiality Due to the blanket nature of the problem, traditional file system access.

To retrieve all the permissions set for an app, use getApplicationPermissions(). This allows you to more compactly check multiple permissions settings at once, as the following example shows.

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