code128 barcode generator vb.net 10: Security in Java

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10: Security
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Security Manager within code, place the following as the first line in the main() method:
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System.setSecurityManager( new SecurityManager() );
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To establish the Java Security Manager via the command line, add the following parameter to the command line:
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-Djava.security.manager
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Once installed, the Java Security Manager checks whether a particular permission is granted to the specific requesting class; it throws a SecurityException if the permission is denied. The Java Security Manager checks by examining the call trace, so if an untrusted piece of code is invoked as part of a call to a secured method, it will fail because of the presence of the untrusted code. The permission is itself an abstract class representing access to a system resource. The permission can optionally contain a name and an action. When specified, these optional attributes further refine the permission being granted. For example, java.io.SocketPermission can be established with a host name of 66.108.43.211:9080 and an action of accept,connect,listen, which will allow the code to accept connections on, connect to, or listen on port 9080 on a host specified by IP address 66.108.43.211. Here is a list of the security restrictions that Java technology environments normally impose on an unsigned applet running in a browser:
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n Can make network connections only to the host from which it was
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downloaded.
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n Can utilize only its own code and is not allowed to load libraries or define
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n Cannot change thread priority. n Cannot execute any native code. n Cannot install software. n Cannot issue an RMI call to a remote object running on a different server
than the applet s.
n Cannot monitor mouse motion. n Cannot programmatically read from or write to the clipboard. n Cannot read or write local files on the host that is executing it. n Cannot read the system properties specified in Table 10-3. n Cannot send e-mail to a server other than the host from which it was
downloaded.
Identify Locations for Implementation of Security Features
TABLE 10-3
Property
java.home java.class.path user.name user.home user.dir
Description
Java installation directory Java classpath User account name User home directory User s current working directory
Security Packages of the Java Platform
n Cannot start any program on the local host. n Cannot talk to a serial or parallel port. n Cannot use System.setOut() or System.setErr() methods to redirect the
console.
n Cannot use the Preferences API. n Cannot use the Reflection API.
CERTIFICATION OBJECTIVE 10.02
Given an Architectural System Specification, Identify Appropriate Locations for Implementation of Specified Security Features and Select Suitable Technologies for Implementation of Those Features
We will now take a look at the authentication and authorization security features that are part of a distributed network environment. We ll look at specific implementations and provide example code for review.
Authentication
In distributed computing, authentication is the device used by callers and service providers to prove to one another that they are to be trusted. When the proof is bidirectional, it is called mutual authentication. Authentication establishes an actor s identities and proves that each instance is authenticated. An entity participating in a call without establishing an identity is unauthenticated.
10: Security
Authentication is achieved in phases. Initially, an authentication context is established by performing authentication, requiring knowledge of a secret password. The authentication context encapsulates the identity and is able to fabricate an authenticator a proof of identity. The authentication context is then used to provide authentication to other entities with which it interacts. The utility of authentication context should be well planned by the enterprise security team. Of late, security and identity management has become a critical enterprise function. Most large enterprises now have an adjunct group responsible for maintaining a user identity throughout the enterprise environment. Some large enterprises will have thousands of applications, each with its own authentication and identity maintenance. Software such as Thor (www.thortech.com) is designed to maintain users, groups, and security policy that provisions authentication for all of the secured resources (programs and data) within an enterprise. Potential policies for controlling access to an authentication context are listed here:
n Once the user performs an authentication, the processes the user invokes
inherit access to the authentication context.
n When a component is authenticated, access to the authentication context
may be available to other trusted components.
n When a component is expected to impersonate its caller, the caller delegates
its authentication context to the called component. The whole issue of propagation of authentication context from client to the Enterprise JavaBeans (EJB) server to the Enterprise Information System (EIS) server is still evolving, both in terms of the specification as well as vendor offerings. According to the current Java specification, the container is the authentication boundary between callers and components hosted by the container. To this end, JAAS is a package that enables services to authenticate and enforce access controls upon clients. It implements a Java version of the standard, pluggable authentication module framework and supports client-based authorization. JAAS was integrated into Java in version 1.4. The core facilities of Java s security design are intended to protect a client from developers. The client gives permissions to developers to access resources on the client machine. JAAS allows developers to grant or deny access to their programs based on the authentication credentials provided by the client. The JAAS specification extends the types of principals and credentials that can be associated with the client, but it is also evolving.
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