Dynamics in .NET

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The figure on page 334 shows the dynamics of object creation. A process creating an object through a FACTORY defines the rights for other subjects with respect to this object.
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Controlled Object Factory 333
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Each object may have an associated access control list (ACL). This will list the rights each user has for the associated object. Each entry specifies the rights that any other
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Creation_Request Process * Factory 1 * Object * Access_Right
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object within the system can have. In general, each right can be an allow or a deny. These are also known as Access Control Entries (ACE) in the Windows environment (see [Har01], [Mic00], and [Zac87]). The set of access rules is also known as the Access Control List (ACL) in Windows and most operating systems. Capabilities are an alternative to an ACL. A capability corresponds to a row in an access matrix. This is in contrast to the ACL, which is associated with the object. The capability indicates to the secure object that the subject does indeed have the right to perform the operation. The capability may carry some authentication features in order to show that the object can trust the provided capability information. A global table can contain rows that represent capabilities for each authenticated user [And01], or the capability may be implemented as a lists for each user which indicates which object each user has access to. [Kin01]
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Our users can now be given only the rights to the created objects that they need. This prevents them from having too many (possibly unnecessary) object rights. Many misuses occur through processes having too many rights.
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Operating System Access Control
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create Object
Object creation dynamics
Known Uses
The Win32 API allows a process to create objects with various Create system calls using a structure that contains access control information (DACL) passed as a reference. When the object is created, the access control information is associated with the object by the kernel. The kernel returns a handle to the caller to be used for access to the object.
The following benefits may be expected from applying this pattern:
There will be no objects that have default access rights because somebody forgot to define rights to access them It is possible to define access rights to an object based on its sensitivity Objects allocated from a resource pool can have rights attached to them dynamically The operating system can apply ownership policies: for example, the creator of an object may receive all possible rights to the objects it creates. The following potential liabilities may arise from applying this pattern: There is a process creation overhead It may not be clear what initial rights to define
See Also
BUILDER and other creation patterns [GoF95].
Controlled Object Monitor 335
Controlled Object Monitor
This pattern addresses how to control access by a process to an object. Use a reference monitor to intercept access requests from processes. The reference monitor checks whether the process has the requested type of access to the object.
Our operating system does not check all user requests to access resources such as files or memory areas. A hacker discovered that some accesses are not checked, and was able to steal customer information from our files. He also left a program that randomly overwrites memory areas and produces serious disruption to the other users.
An operating system that consists of many users, objects that may contain sensitive data, and where we need to have controlled access to resources.
When objects are created we define the rights processes have to them. These authorization rules or policies must be enforced when a process attempts to access an object. The solution to this problem must resolve the following forces:
There may be many objects with different access restrictions defined by authorization rules: we need to enforce these restrictions when a process attempts to access an object We need to control different types of access, or the object may be misused