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Permissions allow you to specify whether a given account or role will be granted or denied access to a specific resource Different resources allow different sets of permissions The file system, for example, lets you to set permissions allowing or denying users to read, write, modify, list, and execute files SQL Server lets you set permissions allowing or denying users to create databases, create tables, edit rows of data, and so on Process by which an entity provides credentials as proof of its identity The system checks the credentials and determines whether the entity really is who it says it is Information used for authentication purposes normally containing the name of the account and some piece of information that only the account holder should know or possess Credentials are normally supplied as a username/password pair, but may be certificate- or biometrically based.

Both the Polygon and Rectangle classes are used by the next class, PolygonSprite, to define all game objects. Listing 4-2. The Polygon Class for Asteroids package ch04.common; public class Polygon { public int npoints; public int[] ypoints; public int[] xpoints; protected Rectangle bounds; public Polygon() { xpoints = new int[4]; ypoints = new int[4]; } public // // // if } Polygon(int xpoints[], int ypoints[], int npoints) { Fix 4489009: should throw IndexOutofBoundsException instead of OutofMemoryException if npoints is huge and > {x,y}points.length (npoints > xpoints.length || npoints > ypoints.length) { throw new IndexOutOfBoundsException( "npoints > xpoints.length || npoints > ypoints.length");

Process by which the system determines whether an authenticated user has permissions to access a specific resource After Windows authenticates an entity, the operating system creates an object known as an access token containing identification and role information for the authenticated entity Windows attaches a copy of the access token to every running process to give the process a security context under which to run Applications run under different accounts Accounts have different security permissions As such, application permissions are dependent on the account running the application Security context simply refers to the permissions the application is subject to based on the account running the application You can think of this as an access token for web applications using Forms Authentication A Forms Authentication ticket contains user and role information for an authenticated entity.

The source code for this book is available in ZIP file format in the Downloads section of the Apress Web site (www.apress.com).

An authenticated entity passes the ticket along with every web request as a cookie or a parameter on the query string ASPNET then uses that ticket to create an IPrincipal object identifying the entity and the roles to which the entity belongs so the web request may be processed with an appropriate security context Allows a process to access a resource using a different security context than the one specified in the access token In ASPNET, you can opt for an application to impersonate individual users as they access the application, or you can opt for the entire application to impersonate one specific user By default, impersonation is disabled, and ASPNET runs using the ASPNET account in IIS 5 and the Network Service account in IIS 6 You ll learn about impersonation in more detail later in the chapter.

Delegation is a form of impersonation that works across a network When you want to impersonate an account on a network resource, the network resource must be able to authenticate the credentials you re trying to impersonate Delegation requires that you impersonate an account whose credentials can authenticate on both machines..

this.npoints = npoints; this.xpoints = new int[npoints]; this.ypoints = new int[npoints]; System.arraycopy(xpoints, 0, this.xpoints, 0, npoints); System.arraycopy(ypoints, 0, this.ypoints, 0, npoints); } void calculateBounds(int xpoints[], int ypoints[], int npoints) { int boundsMinX = Integer.MAX_VALUE; int boundsMinY = Integer.MAX_VALUE; int boundsMaxX = Integer.MIN_VALUE; int boundsMaxY = Integer.MIN_VALUE; for (int i = 0; i < npoints; i++) { int x = xpoints[i]; boundsMinX = Math.min(boundsMinX, boundsMaxX = Math.max(boundsMaxX, int y = ypoints[i]; boundsMinY = Math.min(boundsMinY, boundsMaxY = Math.max(boundsMaxY, }