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Test Number : 310-110
Test denomination : Sun Certified Mobile Application Developer for the Java 2 Platform, Micro Edition, Version 1.0
Vendor denomination : SUN
braindumps : 340 Dumps Questions

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Sun Certified Mobile Application Developer for the Java 2 Platform, Micro Edition, Version 1.0 book

Java 2 Platform protection | 310-110 Dumps and real test Questions with VCE practice Test

This chapter explains the Java 2 platform structure and its protection facets as they practice to pile Java applications. In particular, it describes the a considerable number of Java systems and the core security features that contribute to the conclusion-to-end protection of Java-based functions working on a lot of methods—from servers to stand-on my own computers, computer systems to gadgets, and devices to sane cards.

This chapter is from the bespeak 

themes during this Chapter

  • Java safety architecture
  • Java Applet safety
  • Java internet birth protection
  • Java security administration equipment
  • J2ME protection structure
  • Java Card safety structure
  • Securing the Java Code
  • solar's Java philosophy of "Write as soon as, flee anyplace" has been an evolving success memoir since its inception, and it has revolutionized the computing industry by supplying to us the most equipped platform for constructing and operating a wide orbit of functions and functions. In customary, the Java platform offers a well-known-purpose object-oriented programming language and a typical runtime ambiance for establishing and delivering relaxed, cross-platform utility solutions that will also exist accessed and dynamically loaded over the network or flee locally.

    With the unlock of the Java 2 Platform, solar categorised the Java technologies below three key primary versions so as to simplify software evolution and deployment. The Java 2 ordinary edition (J2SE) provides the runtime atmosphere and API applied sciences for setting up and executing basic Java applications, and it additionally serves as the cozy foundation for running Java enterprise functions. The Java 2 enterprise edition (J2EE), or the J2EE Platform, is a set of specifications and API technologies for constructing and deploying multi-tier traffic functions. To assist Java on microdevices and embedded methods, Java 2 Micro edition (J2ME) offers the runtime ambiance and API applied sciences for addressing the needs of purchaser electronics and gadgets. With its common adoption, today Java expertise is enabled and achieved from sane cards to microdevices, handhelds to desktops, workstations to traffic servers, mainframes to supercomputers, and so on.

    To facilitate end-to-end security of the Java platform-based mostly application solutions, the Java runtime environment (JRE) and the Java language deliver a high-quality protection basis from the floor up by using imposing powerful layout and structural constraints on the code and its execution environment. This distinguishes the Java platform from other software programming languages—it has a well-described safety architectural mannequin for programming Java-primarily based options and their cozy execution.

    during this chapter, they are able to discover the quite a few Java systems and the intricate particulars of their safety structure that develop contributions to the end-to-conclusion safety of Java-based mostly utility options. In selected, they can examine Java protection and the inherent aspects of prerogative here technologies:

  • J2SE security
  • Java applet safety
  • Java web dawn protection
  • Java safety administration tools
  • J2ME security
  • Java Card security
  • Java Code obfuscation
  • safety has been an integral share of Java technology from day one. protection is also an evolving design aim of the Java neighborhood—building and working relaxed and efficient Java-based mostly community purposes. The primary cause of Java's success these days as a comfortable execution ambiance is the intrinsic safety of its architectural basis—the Java digital machine (JVM) and the Java language. This groundwork achieves the fundamental Java security aim and its definitive approaches for extending safety capabilities to exist inevitable features similar to confidentiality, integrity, trust, etc. A 2nd judgement for its success is its capability to carry an interoperable and platform-impartial protection infrastructure that can also exist integrated with the security of the underlying operating rig and capabilities.

    The Java virtual laptop (JVM)

    The JVM is an abstract computing engine that resides on a number computing device. it is the execution atmosphere for the Java programming language and has the primary responsibility for executing the compiled code by deciphering it in a laptop-impartial and go-platform style. The JVM is regularly talked about because the Java runtime ambiance. while executing a Java program working on proper of the JVM, the JVM insulates the software from the underlying transformations of the operating methods, networks, and rig hardware, therefore guaranteeing pass-platform compatibility among the entire implementations of the Java platform.

    The Java language enables creation of general-goal classes called Java classes that characterize a Java program or an software. The Java courses collect into a format known as Java's executable bytecodes, which might exist quite corresponding to the computer language that can flee on excellent of a JVM. The JVM also permits clients to download and execute untrusted classes and applications from remote materials or over a network. To aid dawn of Java add-ons over the community, the JVM controls the simple safety layer by pass of retaining clients and the atmosphere from malicious classes. To enable safety, the JVM enforces stringent measures ensuring programs safety on the host client laptop and its goal server environments.

    Distributing the executable Java bytecode over a community or working instantly interior an internet browser or a client's computing device leads to diverse protection hazards and attacks, comparable to disclosure of the goal atmosphere to the untrusted purposes and harm or modification of the customer's private assistance and information. for example, Java applets downloaded from a community aren't allowed to fill entry to, examine from, or write to a aboriginal file equipment. they are also not allowed to create community connections to any host system except the one the position they are deployed. then again, stand-by myself Java purposes that dwell and flee locally as depended on purposes don't appear to exist subjected to these protection points. the famous thing difficulty is that allowing untrusted applications corresponding to Java applets to exist downloaded from a community by the employ of an internet browser and permitting them to access determined resources on the host computing device paves the manner for safety breaches and turns into a potential avenue for the spread of viruses. To steer lucid of accepted protection breaches and threats, the JVM provides a developed-in Java safety architecture model, configurable security guidelines, access exploit mechanisms, and safety extensions. as a result of the built-in JVM protection aspects, Java courses can flee safely and are more securely included from frequent vulnerabilities.

    The Java Language

    Java is a general-aim object-oriented programming language corresponding to C++. It promises platform-neutral compiled code that can exist carried out using a JVM and is hypothetical to exist used in disbursed utility environments, heterogeneous methods, and distinctive community environments. The Java language is also designed to deliver for the protection and integrity of the utility and its underlying techniques at All ranges—from the Java language constructs to the JVM runtime and from the nature library to the finished utility.

    The a brace of inherent elements of the Java language that supply for the at ease Java platform are as follows:

  • The language defines All primitives with a specific measurement and All operations are defined to exist in a particular order of execution. as a consequence, the code completed in part JVMs will no longer differ from the particular order of execution.
  • The language provides access-control performance on variables and methods within the object by defining denomination house management for nature and manner names. This secures the program by using limiting entry to its famous objects from untrusted code. for instance, access is restricted by qualifying the classification participants as public, covered, deepest, package, and many others.
  • The Java language does not enable defining or dereferencing pointers, which skill that programmers cannot forge a pointer to the reminiscence or create code defining offset points to reminiscence. All references to strategies and case variables in the classification file are performed by means of symbolic names. The removing of pointers helps to steer lucid of malicious courses dote computing device viruses and misuse of pointers such as gaining access to private methods directly through the employ of a pointer ranging from the item's pointer, or working off the conclusion of an array.
  • The Java object encapsulation helps "programming through contract," which makes it feasible for the reuse of code that has already been confirmed.
  • The Java language is a strongly typed language. throughout compile time, the Java compiler does wide classification checking for classification mismatches. This mechanism guarantees that the runtime information class variables are suitable and in line with the collect time information.
  • The language makes it feasible for declaring classes or methods as last. Any classes or methods that are declared as last cannot exist overridden. This helps to offer protection to the code from malicious attacks akin to creating a subclass and substituting it for the fashioned classification and override strategies.
  • The Java garbage assortment mechanism contributes to at ease Java classes by means of presenting a lucid storage allocation and recovering unused reminiscence instead of deallocating the reminiscence using manual intervention. This ensures application integrity All the pass through execution and prevents programmatic entry to unintentional and unsuitable releasing of reminiscence leading to a JVM crash.
  • With these features, Java fulfills the vow of proposing a secure programming language that gives the programmer the liberty to jot down and execute code in the neighborhood or ration it over a network.

    Java developed-in security model

    within the outdated two sections, they in brief seemed at the primary security aspects offered via the JVM and the Java language. As share of its protection architecture, Java has a built-in policy-pushed, domain-based mostly protection model. This permits enforcing security policies, preserving/controlling access to substances, rule-based mostly class loading, signing code and assigning levels of means, and keeping content privacy.

    within the first unencumber of the solar Java Platform, the Java evolution package 1.0.x (JDK) introduced the belief of a sandbox-based mostly safety model. This essentially helps downloading and operating Java applets securely and avoids any potential hazards to the consumer's substances. With the JDK 1.0 sandbox protection mannequin, All Java applications (except Java applets) done in the community can fill complete entry to the elements attainable to the JVM. software code downloaded from faraway components, equivalent to Java applets, could fill entry most efficient to the limited supplies offered inside its sandbox. This sandbox safety protects the Java applet person from skills hazards since the downloaded applet can't entry or alter the consumer's materials beyond the sandbox.

    The unlock of JDK 1.1.x brought the proposal of signed applets, which allowed downloading and executing applets as trusted code after verifying the applet signer's information. To facilitate signed applets, JDK 1.1.x brought assist for cryptographic algorithms that deliver digital signature capabilities. With this aid, a Java applet classification may exist signed with digital signatures in the Java archive format (JAR file). The JDK runtime will employ the relied on public keys to verify the signers of the downloaded applet after which deal with it as a relied on aboriginal application, granting access to its resources. design 3-1 suggests the illustration of a sandbox within the JDK 1.1 protection mannequin.

    Java 2 protection model

    The unlock of J2SE [J2SE] brought a brace of massive enhancements to JDK 1.1 and introduced such features as safety extensions proposing cryptographic services, digital certificate management, PKI management, and connected tools. one of the crucial most famous alterations within the Java 2 safety architecture are as follows:

  • coverage-pushed limited entry manage to JVM substances.
  • guidelines-based nature loading and verification of byte code.
  • gadget for signing code and assigning degrees of means.
  • coverage-pushed access to Java applets downloaded via an internet browser.
  • within the Java 2 protection structure, All code—despite even if it is flee in the community or downloaded remotely—can also exist subjected to a protection coverage configured by means of a JVM consumer or administrator. All code is configured to employ a selected zone (equivalent to a sandbox) and a security coverage that dictates even if the code can exist flee on a specific domain or now not. design three-2 illustrates the J2SE safety structure and its simple facets.

    03fig02.gif

    determine three-2 Java 2 security structure and simple elements

    Let's assume a greater specific analyze those core elements of the Java 2 security structure.

    coverage Domains ( java.protection.ProtectionDomain ): In J2SE, All local Java applications flee unrestricted as relied on purposes via default, however they can also exist configured with entry-control guidelines comparable to what is defined in applets and faraway purposes. this is achieved by using configuring a ProtectionDomain, which makes it feasible for grouping of classes and instances and then associating them with a set of permissions between the elements. protection domains are often categorised as two domains: "system domain" and "utility domain." All blanketed exterior elements, such as the file programs, networks, and the like, are available simplest by means of device domains. The substances that are a share of the unique execution thread are regarded an application area. So definitely, an software that requires entry to an external useful resource may also fill an utility domain in addition to a gadget area. while executing code, the Java runtime continues a mapping from code to insurance blueprint domain and then to its permissions.

    coverage domains are determined by means of the existing safety coverage defined for a Java runtime ambiance. The domains are characterized using a set of permissions associated with a code supply and location. The java.security.ProtectionDomain classification encapsulates the features of a included area, which encloses a set of classes and its granted set of permissions when being done on behalf of a user.

    Permissions ( java.security.Permission ): In essence, permissions assess even if entry to a useful resource of the JVM is granted or denied. To exist more actual, they supply precise components or courses working in that case of the JVM the capacity to enable or negative determined runtime operations. An applet or an utility the usage of a security manager can acquire entry to a gadget useful resource most efficient if it has permission. The Java protection API defines a hierarchy for permission classes that may also exist used to configure a safety policy. at the root, java.security.Permission is the summary type, which represents entry to a goal aid; it will possibly also consist of a group of operations to construct access on a particular resource. The permission class consists of a number of subclasses that symbolize entry to several types of materials. The subclasses belong to their own applications that depict the APIs for the particular resource. some of the ordinary permission classes are as follows:

    For wildcard permissions

    -java.protection.AllPermission

    For named permissions

    -java.protection.BasicPermission

    For file gadget

    -java.io.FilePermission

    For community

    -java.web.SocketPermission

    For residences

    -java.lang.PropertyPermission

    For runtime components

    -java.lang.RuntimePermission

    For authentication

    -java.safety.NetPermission

    For graphical supplies

    -java.awt.AWTPermission

    example 3-1 shows the pass to deliver protection to entry to an object the employ of permissions. The code shows the caller application with the mandatory permission to access an object.

    example 3-1. the usage of Java permissions to offer protection to access to an object // Create the article that requires insurance plan String protectedObj = "For depended on eyes only"; // create the required permission so as to // offer protection to the article. // guard, represents an object this is used to protect // entry to another object. guard myGuard = new PropertyPermission ("java.domestic", "examine"); // Create the preserve GuardedObject gobj = new GuardedObject(protectedObj, myGuard); // rep the guarded object try object o = gobj.getObject(); entrap (AccessControlException e) // can't entry the article

    Permissions can even exist defined the employ of security coverage configuration information (java.policy). as an instance, to accouter access to study a file in "c:\temp\" (on home windows), the FilePermission can exist described in a security policy file (see instance three-2).

    instance 3-2. atmosphere Java permissions in coverage configuration file supply permission java.io.FilePermission "c:\\temp\\testFile", "study"; ;

    policy: The Java 2 security coverage defines the coverage domains for All running Java code with entry privileges and a group of permissions akin to study and write access or making a connection to a number. The policy for a Java application is represented via a coverage object, which provides a means to declare permissions for granting entry to its required materials. In commonplace, All JVMs fill protection mechanisms inbuilt that permit you to contour permissions via a Java safety policy file. A JVM makes employ of a policy-driven access-control mechanism by means of dynamically mapping a static set of permissions described in a unique or more coverage configuration info. These entries are sometimes known as accouter entries. A person or an administrator externally configures the policy file for a J2SE runtime environment the employ of an ASCII textual content file or a serialized binary file representing a coverage category. In a J2SE ambiance, the default system-extensive safety coverage file java.coverage is determined at <JRE_HOME>/lib/protection/ listing. The policy file region is described within the safety houses file with a java.security atmosphere, which is located at <JRE_HOME>/lib/protection/java.protection.

    example 3-3 is a coverage configuration file that specifies the permission for a signed JAR file loaded from "http://coresecuritypatterns.com/*" and signed by pass of "javaguy," and then gives you examine/write entry to All files in /export/home/verify.

    instance 3-3. atmosphere codebase and permissions in policy configuration file supply signedBy "javaguy", codebase "http://coresecuritypatterns.com/*" permission java.io.FilePermission "/export/domestic/verify/*", "read,write"; ;

    The J2SE environment also provides a GUI-based mostly device known as "policytool" for enhancing a protection coverage file, which is located at "<JAVA_HOME>/bin/policytool."

    via default, the Java runtime uses the coverage info located in:

    $java.home/jre/lib/protection/java.policy $person.home/.java.policy

    These policy data are inevitable within the default safety file:

    $java.domestic/jre/lib/security/java.safety

    The helpful policy of the JVM runtime environment may exist the union of All permissions in All coverage files. To specify an further coverage file, which you could set the java.safety.coverage system property on the command line:

    java -Djava.security.supervisor -Djava.safety.coverage=myURL MyClass

    to ignore the policies in the java.safety file and handiest employ the customized coverage, employ '==' as a substitute of '=':

    java -Djava.security.manager -Djava.safety.coverage==Mylocation/My.coverage MyClass

    SecurityManager ( java.lang.SecurityManager ): each and every Java software can fill its own security manager that acts as its simple safety preserve in opposition t malicious assaults. The security manager enforces the mandatory protection policy of an application with the aid of performing runtime checks and authorizing entry, thereby maintaining supplies from malicious operations. below the hood, it makes employ of the Java security coverage file to Come to a determination which set of permissions are granted to the courses. although, when untrusted courses and third-party applications employ the JVM, the Java safety manager applies the security policy linked to the JVM to identify malicious operations. in many situations, the position the casual mannequin does not embrace malicious code being flee in the JVM, the Java security manager is unnecessary. In instances the position the SecurityManager detects a security coverage violation, the JVM will sling an AccessControlException or a SecurityException.

    In a Java utility, the security supervisor is decided through the setSecurityManager formulation in category device. And the present protection supervisor is received via the getSecurityManager components (see illustration three-four).

    illustration three-4. the usage of SecurityManager SecurityManager mySecurityMgr = gadget.getSecurityManager(); if (mySecurityMgr != null) mySecurityMgr.checkWrite(name);

    The class java.lang.SecurityManager consists of a brace of checkXXXX strategies dote checkRead (String file) to assess access privileges to a file. The investigate methods denomination the SecurityManager.checkPermission formula to locate whether the calling application has permissions to fulfill the requested operation, in response to the protection policy file. If now not, it throws a SecurityException.

    in case you need to fill your functions employ a SecurityManager and protection policy, start up the JVM with the -Djava.safety.supervisor option and you can also specify a protection policy file the employ of the guidelines within the -Djava.safety.policy option as JVM arguments. in case you permit the Java security manager to your software but don't specify a protection coverage file, then the Java security supervisor uses the default safety policies described in the java.policy file in the $JAVA_HOME/jre/lib/security directory. case 3-5 programmatically allows for the safety manager.

    illustration three-5. the employ of SecurityManager for limiting entry manage // before the safety supervisor is enabled, // this call is possible equipment.setProperty("java.version","Malicious: Delete"); try // permit the security supervisor SecurityManager sm = new SecurityManager(); system.setSecurityManager(sm); seize (SecurityException se) // SecurityManager already set // After the safety manager is enabled: // This call is not any longer viable; // an AccessControlException is thrown device.setProperty ("java.version", "Malicious: Delete");

    The protection supervisor can also exist apportion in from the command-line interface:

    java -Djava.safety.manager <ClassName>

    AccessController ( java.security.AccessController ): The entry controller mechanism performs a dynamic inspection and decides whether the entry to a selected useful resource may also exist allowed or denied. From a programmer's standpoint, the Java access controller encapsulates the region, code source, and permissions to operate the selected operation. In a touchstone procedure, when a program executes an operation, it calls throughout the security supervisor, which delegates the request to the entry controller, after which eventually it gets entry or denial to the elements. within the java.security.AccessController type, the checkPermission system is used to check even if the entry to the necessary aid is granted or denied. If a requested access is granted, the checkPermission formulation returns genuine; otherwise, the components throws an AccessControlException.

    for example, to check study and write permission for a directory in the file system, you could employ the code shown in instance three-6.

    instance 3-6. the employ of AccessController try AccessController.checkPermission (new FilePermission("/var/temp/*", "study,write")); seize (SecurityException e) // doesn't fill permission to entry the listing

    Codebase: A URL vicinity of classification or JAR information are precise using codebase. The URL may additionally contend with a position of a directory within the local file rig or on the information superhighway. illustration three-7 retrieves the entire permissions granted to a particular classification that is been loaded from a code base. The permissions are advantageous handiest if the safety supervisor is apportion in. The loaded nature uses these permissions via executing category.getProtectionDomain() and coverage.getPermissions().

    illustration 3-7. the usage of codebase type URL codebase = null; are attempting // rep permissions for a URL codebase = new URL("http://coresecuritypatterns.com/"); capture (MalformedURLException e) entrap (IOException e) // construct a code supply with the code base CodeSource cs = new CodeSource(codebase, null); // rep All granted permissions PermissionCollection pcoll = coverage.getPolicy().getPermissions(cs); // View each permission in the permission assortment Enumeration enum = pcoll.points(); for (; enum.hasMoreElements(); ) permission p = (Permission)enum.nextElement(); device.out.println("Permission " + p);

    To stare at various case three-7, instance three-eight is the policy file (check.coverage), which provides permission to study All rig houses.

    illustration three-eight. coverage file for checking out permissions to a codebase supply codebase "http://coresecuritypatterns.com/-" // supply permission to examine All device residences permission java.util.PropertyPermission "*", "read"; ;

    to ignore the default policies in the java.security file, and best employ the part coverage, employ '==' instead of '='. With the policy simply presented, you may additionally flee prerogative here:

    java -Djava.security.policy==test.coverage TestClass

    CodeSource: The CodeSource permits illustration of a URL from which a class became loaded and the certificate keys that fill been used to mark that type. It provides the identical inspiration as codebase, nevertheless it encapsulates the codebase (URL) of the code where it's loaded and additionally the certificates keys that were used to verify the signed code. The CodeSource category and its two arguments to specify the code region and its associated certificates keys are as follows:

    CodeSource(URL url, java.safety.cert.certificate certs[]);

    To assemble a code supply with the code base and with out the usage of certificates, you could employ the following:

    CodeSource cs = new CodeSource(codebase, null);

    Bytecode verifier: The Java bytecode verifier is an essential component of the JVM that plays the famous position of verifying the code prior to execution. It ensures that the code became produced consistent with standards with the aid of a staunch compiler, confirms the structure of the nature file, and proves that the collection of Java byte codes are criminal. With bytecode verification, the code is proved to exist internally consistent following most of the rules and constraints described by means of the Java language compiler. The bytecode verifier may additionally also realize inconsistencies involving inevitable circumstances of array certain-checking and object-casting via runtime enforcement.

    To manually control the stage of bytecode verification, the options to the Java command with the V1.2 JRE are as follows:

  • -Xverify:far flung runs verification technique on classes loaded over community (default)
  • -Xverify:all verifies All courses loaded
  • -Xverify:none does no verification
  • ClassLoader: The ClassLoader performs a part office in Java security, since it is primarily answerable for loading the Java courses into the JVM after which converting the raw records of a class into an interior statistics structure representing the class. From a safety standpoint, nature loaders can also exist used to establish security guidelines earlier than executing untrusted code, to verify digital signatures, and so on. To implement security, the classification loader coordinates with the safety manager and entry controller of the JVM to investigate the security policies of a Java utility. The class loader further enforces protection with the aid of defining the namespace separation between courses which are loaded from different locations, including networks. This ensures that courses loaded from assorted hosts will not talk in the identical JVM house, thus making it inconceivable for untrusted code to rep tips from relied on code. The class loader finds out the Java utility's entry privileges using the protection manager, which applies the mandatory protection policy in accordance with the soliciting for context of the caller application.

    With the Java 2 platform, All Java purposes fill the faculty of loading bootstrap classes, rig courses, and utility classes at the dawn the employ of an inside classification loader (also referred to as primordial class loader). The primordial nature loader makes employ of a different classification loader SecureClassLoader to deliver protection to the JVM from loading malicious courses. This java.protection.SecureClassLoader nature has a blanketed constructor that associates a loaded nature to a protection domain. The SecureClassLoader also makes employ of permissions set for the codebase. for instance, URLClassLoader is a subclass of the SecureClassLoader. URLClassLoader allows for loading a category or zone targeted with a URL.

    consult with instance 3-9, which indicates how a URLClassLoader can exist used to load classes from a directory.

    example three-9. using URLClassLoader // Create a File object on the foundation of the // directory containing the category file File file = new File("c:\\myclasses\\"); try // metamorphose File to a URL URL url = file.toURL(); URL[] urls = new URL[]url; // Create a new classification loader with the directory ClassLoader myclassloader = new URLClassLoader(urls); // Load in the category; // MyClass.type should still exist observed in // the listing file:/c:/myclasses/com/security nature myclass = myclassloader.loadClass("com.protection.MySecureClass"); seize (MalformedURLException e) trap (ClassNotFoundException e)

    Keystore and Keytool: The Java 2 platform gives a password-covered database facility for storing trusted certificates entries and key entries. The keytool permits the users to create, manage, and administer their personal public/private key pairs and linked certificates which are meant for employ in authentication services and in representing digital signatures.

    we can assume a glance in superior detail at the utilization of the Java keystore and keytool and the pass these tools aid Java safety within the share entitled "Java protection administration equipment," later in this chapter.


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