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Test Code : 310-110
Test name : Sun Certified Mobile Application Developer for the Java 2 Platform, Micro Edition, Version 1.0
Vendor name : SUN
: 340 real Questions

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

Java 2 Platform safety | 310-110 real Questions and VCE exercise Test

This chapter explains the Java 2 platform architecture and its protection facets as they apply to pile Java purposes. In certain, it describes the quite a lot of Java structures and the core security points that compose a contribution to the end-to-conclusion security of Java-based mostly applications running on a variety of techniques—from servers to stand-on my own computer systems, computers to contraptions, and gadgets to smart cards.

This chapter is from the e-book 

topics during this Chapter

  • Java protection structure
  • Java Applet protection
  • Java internet birth security
  • Java safety administration tools
  • J2ME security structure
  • Java Card safety architecture
  • Securing the Java Code
  • sun's Java philosophy of "Write as soon as, Run anyplace" has been an evolving success myth considering the fact that its inception, and it has revolutionized the computing industry with the aid of supplying to us probably the most ready platform for constructing and running a Big orbit of functions and functions. In generic, the Java platform offers a common-aim object-oriented programming language and a common runtime atmosphere for establishing and delivering secure, cross-platform software solutions that can subsist accessed and dynamically loaded over the network or Run locally.

    With the unlock of the Java 2 Platform, sun classified the Java applied sciences below three key most Important variants with a view to simplify utility pile and deployment. The Java 2 common edition (J2SE) offers the runtime atmosphere and API applied sciences for developing and executing fundamental Java purposes, and it additionally serves because the at ease groundwork for operating Java commerce functions. The Java 2 commercial enterprise edition (J2EE), or the J2EE Platform, is a set of requirements and API technologies for constructing and deploying multi-tier commerce applications. To assist Java on microdevices and embedded programs, Java 2 Micro edition (J2ME) gives the runtime ambiance and API applied sciences for addressing the wants of buyer electronics and contraptions. With its frequent adoption, nowadays Java know-how is enabled and done from sensible cards to microdevices, handhelds to computers, workstations to commercial enterprise servers, mainframes to supercomputers, and so forth.

    To facilitate end-to-end security of the Java platform-based mostly utility options, the Java runtime ambiance (JRE) and the Java language provide a superior protection basis from the floor up with the aid of imposing effective structure and structural constraints on the code and its execution atmosphere. This distinguishes the Java platform from different software programming languages—it has a well-defined protection architectural model for programming Java-based solutions and their cozy execution.

    during this chapter, they will explore the various Java systems and the intricate particulars of their protection structure that contribute to the conclusion-to-conclusion protection of Java-primarily based utility options. In specific, they can study Java security and the inherent aspects of the following technologies:

  • J2SE protection
  • Java applet security
  • Java web nascence safety
  • Java security management tools
  • J2ME protection
  • Java Card security
  • Java Code obfuscation
  • safety has been an integral fragment of Java expertise from day one. protection is additionally an evolving design purpose of the Java neighborhood—building and operating cozy and powerful Java-based mostly community functions. The basic understanding of Java's success today as a cozy execution ambiance is the intrinsic security of its architectural basis—the Java virtual computer (JVM) and the Java language. This groundwork achieves the basic Java security intention and its definitive techniques for extending security capabilities to compose inescapable elements akin to confidentiality, integrity, trust, and so on. A 2nd understanding behind its success is its potential to convey an interoperable and platform-neutral protection infrastructure that can besides subsist integrated with the safety of the underlying operating system and functions.

    The Java virtual laptop (JVM)

    The JVM is an summary computing engine that resides on a bunch computer. it is the execution atmosphere for the Java programming language and has the fundamental accountability for executing the compiled code via interpreting it in a laptop-impartial and move-platform trend. The JVM is regularly spoke of as the Java runtime environment. whereas executing a Java application running on proper of the JVM, the JVM insulates the application from the underlying modifications of the working techniques, networks, and gadget hardware, consequently guaranteeing cross-platform compatibility among bar null of the implementations of the Java platform.

    The Java language permits advent of popular-purpose courses known as Java courses that portray a Java application or an application. The Java courses assemble into a layout called Java's executable bytecodes, which can subsist quite similar to the computer language that can Run on precise of a JVM. The JVM additionally allows clients to download and execute untrusted programs and purposes from far flung materials or over a network. To assist nascence of Java accessories over the community, the JVM controls the simple safety layer with the aid of preserving users and the ambiance from malicious classes. To permit protection, the JVM enforces stringent measures guaranteeing systems protection on the host client laptop and its goal server environments.

    Distributing the executable Java bytecode over a network or running instantly inner an internet browser or a consumer's computer leads to different security hazards and attacks, akin to disclosure of the target atmosphere to the untrusted functions and injure or change of the client's private suggestions and information. for instance, Java applets downloaded from a community are not allowed to tolerate entry to, examine from, or write to a endemic file device. they're besides no longer allowed to create network connections to any host system apart from the one where they are deployed. nevertheless, stand-alone Java purposes that live and Run in the community as trusted purposes don't look to subsist subjected to these safety aspects. the key rigor is that permitting untrusted purposes similar to Java applets to subsist downloaded from a network by the consume of a web browser and allowing them to entry inescapable resources on the host computing device paves the artery for protection breaches and turns into a potential avenue for the unfold of viruses. To linger away from intimate safety breaches and threats, the JVM offers a built-in Java safety architecture model, configurable protection guidelines, access control mechanisms, and security extensions. as a result of the built-in JVM safeguard facets, Java classes can Run safely and are greater securely covered from common vulnerabilities.

    The Java Language

    Java is a regularly occurring-purpose object-oriented programming language similar to C++. It promises platform-neutral compiled code that may besides subsist carried out the consume of a JVM and is intended for consume in distributed utility environments, heterogeneous techniques, and divide network environments. The Java language is besides designed to give for the protection and integrity of the software and its underlying programs in any respect ranges—from the Java language constructs to the JVM runtime and from the class library to the comprehensive software.

    The a few inherent aspects of the Java language that provide for the relaxed Java platform are as follows:

  • The language defines bar null primitives with a particular size and bar null operations are defined to subsist in a specific order of execution. for that reason, the code achieved in distinctive JVMs will no longer orbit from the particular order of execution.
  • The language provides entry-handle functionality on variables and methods within the remonstrate via defining name space management for category and manner names. This secures the application via limiting access to its censorious objects from untrusted code. as an example, access is restricted with the aid of qualifying the classification contributors as public, protected, private, package, and many others.
  • The Java language does not enable defining or dereferencing pointers, which means that programmers can not forge a pointer to the recollection or create code defining offset points to reminiscence. bar null references to strategies and illustration variables within the classification file are done by the consume of symbolic names. The removing of pointers helps to avoid malicious courses love computing device viruses and misuse of pointers equivalent to gaining access to deepest strategies at once by using a pointer starting from the item's pointer, or running off the conclusion of an array.
  • The Java remonstrate encapsulation helps "programming by contract," which permits the reuse of code that has already been tested.
  • The Java language is a strongly typed language. throughout assemble time, the Java compiler does wide nature checking for class mismatches. This mechanism ensures that the runtime information class variables are suitable and in step with the collect time assistance.
  • The language permits declaring courses or methods as ultimate. Any courses or methods that are declared as remaining cannot subsist overridden. This helps to protect the code from malicious attacks corresponding to creating a subclass and substituting it for the gardenvariety nature and override methods.
  • The Java rubbish assortment mechanism contributes to secure Java programs by artery of presenting a transparent storage allocation and getting better unused reminiscence in its set of deallocating the recollection the consume of manual intervention. This ensures application integrity perquisite through execution and prevents programmatic entry to unintended and wrong freeing of reminiscence resulting in a JVM crash.
  • With these elements, Java fulfills the engage of proposing a cozy programming language that offers the programmer the liberty to write down and execute code in the neighborhood or deal it over a network.

    Java built-in security model

    within the outmoded two sections, they in brief looked on the primary safety elements provided through the JVM and the Java language. As a fragment of its security architecture, Java has a built-in coverage-pushed, domain-based safety model. This enables enforcing security guidelines, maintaining/controlling access to resources, rule-based category loading, signing code and assigning levels of potential, and retaining content material privacy.

    in the first unencumber of the solar Java Platform, the Java progress gear 1.0.x (JDK) introduced the suggestion of a sandbox-primarily based safety mannequin. This essentially helps downloading and running Java applets securely and avoids any lore dangers to the user's supplies. With the JDK 1.0 sandbox safety model, bar null Java applications (apart from Java applets) carried out in the community can tolerate full access to the supplies purchasable to the JVM. software code downloaded from remote resources, comparable to Java applets, will tolerate access simplest to the limited components provided within its sandbox. This sandbox protection protects the Java applet consumer from potential risks because the downloaded applet can not entry or alter the consumer's elements beyond the sandbox.

    The unlock of JDK 1.1.x introduced the thought of signed applets, which allowed downloading and executing applets as trusted code after verifying the applet signer's advice. To facilitate signed applets, JDK 1.1.x added pilot for cryptographic algorithms that deliver digital signature capabilities. With this support, a Java applet class may subsist signed with digital signatures within the Java archive layout (JAR file). The JDK runtime will consume the trusted public keys to verify the signers of the downloaded applet and then handle it as a trusted endemic utility, granting access to its supplies. device three-1 indicates the representation of a sandbox in the JDK 1.1 safety model.

    Java 2 safety mannequin

    The liberate of J2SE [J2SE] brought a pair of massive enhancements to JDK 1.1 and introduced such facets as protection extensions proposing cryptographic services, digital certificate administration, PKI administration, and related tools. probably the most most Important alterations within the Java 2 security structure are as follows:

  • policy-driven limited entry control to JVM substances.
  • suggestions-based mostly classification loading and verification of byte code.
  • device for signing code and assigning ranges of capacity.
  • coverage-driven access to Java applets downloaded through an internet browser.
  • within the Java 2 security structure, bar null code—inspite of even if it's Run locally or downloaded remotely—can subsist subjected to a protection policy configured by means of a JVM consumer or administrator. bar null code is configured to compose consume of a specific belt (similar to a sandbox) and a safety coverage that dictates even if the code may besides subsist Run on a specific domain or no longer. determine three-2 illustrates the J2SE protection structure and its simple aspects.


    determine three-2 Java 2 safety structure and basic facets

    Let's rob a extra specific examine those core points of the Java 2 security architecture.

    insurance diagram Domains ( java.safety.ProtectionDomain ): In J2SE, bar null local Java applications Run unrestricted as relied on applications via default, but they could even subsist configured with access-manage guidelines similar to what is described in applets and far off functions. this is performed by configuring a ProtectionDomain, which enables grouping of courses and situations after which associating them with a set of permissions between the materials. protection domains are commonly labeled as two domains: "gadget domain" and "software domain." bar null covered external materials, such as the file methods, networks, etc, are purchasable only by artery of device domains. The substances which are a fragment of the solitary execution thread are regarded an application area. So basically, an utility that requires entry to an exterior resource may besides tolerate an utility belt in addition to a system domain. whereas executing code, the Java runtime maintains a mapping from code to protection domain and then to its permissions.

    protection domains are determined with the aid of the existing security policy defined for a Java runtime ambiance. The domains are characterized the consume of a group of permissions associated with a code supply and location. The java.safety.ProtectionDomain class encapsulates the characteristics of a blanketed domain, which encloses a set of courses and its granted set of permissions when being carried out on behalf of a person.

    Permissions ( java.protection.Permission ): In essence, permissions verify even if access to a useful resource of the JVM is granted or denied. To subsist extra specific, they give unique supplies or courses operating in that instance of the JVM the capacity to enable or deny Definite runtime operations. An applet or an software using a safety manager can gain access to a system aid handiest if it has permission. The Java safety API defines a hierarchy for leave courses that can besides subsist used to configure a safety policy. on the root, java.security.Permission is the summary class, which represents access to a goal aid; it could possibly additionally involve a set of operations to assemble access on a particular resource. The leave class contains several subclasses that characterize access to different types of components. The subclasses belong to their own packages that symbolize the APIs for the particular useful resource. one of the crucial common leave courses are as follows:

    For wildcard permissions


    For named permissions


    For file gadget


    For network


    For homes


    For runtime supplies


    For authentication


    For graphical materials


    illustration 3-1 suggests a artery to give protection to entry to an remonstrate the consume of permissions. The code indicates the caller utility with the required leave to entry an object.

    example 3-1. the usage of Java permissions to offer protection to entry to an object // Create the thing that requires insurance plan String protectedObj = "For depended on eyes only"; // create the necessary leave which will // offer protection to the item. // preserve, represents an remonstrate that is used to offer protection to // entry to an additional object. preserve myGuard = new PropertyPermission ("java.domestic", "examine"); // Create the defend GuardedObject gobj = new GuardedObject(protectedObj, myGuard); // gain the guarded object are trying remonstrate o = gobj.getObject(); seize (AccessControlException e) // can't access the object

    Permissions can even subsist described the consume of protection policy configuration info (java.coverage). as an instance, to appoint access to study a file in "c:\temp\" (on home windows), the FilePermission may besides subsist described in a protection policy file (see illustration 3-2).

    instance 3-2. atmosphere Java permissions in policy configuration file provide leave java.io.FilePermission "c:\\temp\\testFile", "read"; ;

    policy: The Java 2 safety policy defines the insurance policy domains for bar null running Java code with access privileges and a collection of permissions such as read and write access or making a connection to a bunch. The policy for a Java utility is represented through a coverage object, which offers a means to declare permissions for granting entry to its required components. In normal, bar null JVMs tolerate safety mechanisms built in that cheer you define permissions via a Java protection coverage file. A JVM makes consume of a policy-driven access-control mechanism by artery of dynamically mapping a static set of permissions defined in a solitary or more policy configuration data. These entries are often called vouchsafe entries. A person or an administrator externally configures the policy file for a J2SE runtime atmosphere the consume of an ASCII text file or a serialized binary file representing a coverage classification. In a J2SE environment, the default device-wide security policy file java.policy is located at <JRE_HOME>/lib/protection/ directory. The policy file location is defined within the protection properties file with a java.safety surroundings, which is located at <JRE_HOME>/lib/protection/java.protection.

    instance 3-three is a policy configuration file that specifies the leave for a signed JAR file loaded from "http://coresecuritypatterns.com/*" and signed by using "javaguy," and then grants read/write entry to bar null info in /export/home/verify.

    instance three-3. atmosphere codebase and permissions in coverage configuration file provide signedBy "javaguy", codebase "http://coresecuritypatterns.com/*" leave java.io.FilePermission "/export/domestic/look at various/*", "examine,write"; ;

    The J2SE ambiance besides offers a GUI-primarily based device known as "policytool" for editing a safety coverage file, which is create at "<JAVA_HOME>/bin/policytool."

    by default, the Java runtime uses the policy data observed in:

    $java.home/jre/lib/safety/java.policy $user.domestic/.java.coverage

    These coverage info are specified within the default safety file:


    The useful coverage of the JVM runtime environment should subsist the union of bar null permissions in bar null coverage info. To specify an additional coverage file, you could set the java.security.policy device property on the command line:

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

    to ignore the guidelines within the java.safety file and only consume the custom policy, consume '==' in its set of '=':

    java -Djava.protection.supervisor -Djava.security.policy==Mylocation/My.coverage MyClass

    SecurityManager ( java.lang.SecurityManager ): each Java application can tolerate its own safety supervisor that acts as its primary security shield towards malicious assaults. The safety manager enforces the mandatory security policy of an software through performing runtime exams and authorizing access, thereby conserving elements from malicious operations. under the hood, it uses the Java safety policy file to determine which set of permissions are granted to the courses. despite the fact, when untrusted courses and third-celebration purposes consume the JVM, the Java security manager applies the safety coverage linked to the JVM to identify malicious operations. in many cases, where the casual mannequin doesn't encompass malicious code being Run in the JVM, the Java security manager is mindless. In cases the set the SecurityManager detects a safety coverage violation, the JVM will cast an AccessControlException or a SecurityException.

    In a Java application, the security supervisor is determined by artery of the setSecurityManager formulation in nature device. And the latest protection manager is bought via the getSecurityManager formula (see instance three-four).

    example 3-four. using SecurityManager SecurityManager mySecurityMgr = gadget.getSecurityManager(); if (mySecurityMgr != null) mySecurityMgr.checkWrite(name);

    The class java.lang.SecurityManager consists of a few checkXXXX strategies love checkRead (String file) to investigate access privileges to a file. The examine methods name the SecurityManager.checkPermission formula to locate even if the calling application has permissions to effect the requested operation, in line with the security policy file. If no longer, it throws a SecurityException.

    if you wish to tolerate your purposes consume a SecurityManager and protection coverage, start up the JVM with the -Djava.security.supervisor option and you can besides specify a safety policy file the usage of the policies in the -Djava.protection.policy option as JVM arguments. in case you permit the Java protection supervisor on your utility however finish not specify a safety policy file, then the Java safety manager makes consume of the default security policies defined in the java.coverage file in the $JAVA_HOME/jre/lib/safety listing. instance three-5 programmatically allows the protection supervisor.

    example 3-5. the usage of SecurityManager for limiting access manage // earlier than the security manager is enabled, // this name is possible device.setProperty("java.edition","Malicious: Delete"); are trying // allow the security manager SecurityManager sm = new SecurityManager(); equipment.setSecurityManager(sm); capture (SecurityException se) // SecurityManager already set // After the security manager is enabled: // This convene is not any longer feasible; // an AccessControlException is thrown device.setProperty ("java.edition", "Malicious: Delete");

    The protection manager can even subsist installed from the command-line interface:

    java -Djava.protection.supervisor <ClassName>

    AccessController ( java.safety.AccessController ): The access controller mechanism performs a dynamic inspection and decides no matter if the access to a particular resource can besides subsist allowed or denied. From a programmer's standpoint, the Java entry controller encapsulates the place, code source, and permissions to effect the particular operation. In a criterion technique, when a application executes an operation, it calls in the course of the protection supervisor, which delegates the request to the entry controller, after which finally it receives access or denial to the components. within the java.security.AccessController class, the checkPermission formulation is used to investigate even if the access to the mandatory resource is granted or denied. If a requested access is granted, the checkPermission components returns genuine; otherwise, the components throws an AccessControlException.

    as an instance, to investigate read and write leave for a listing in the file gadget, you possibly can consume the code proven in instance 3-6.

    example 3-6. the consume of AccessController are attempting AccessController.checkPermission (new FilePermission("/var/temp/*", "examine,write")); trap (SecurityException e) // does not tolerate leave to entry the directory

    Codebase: A URL location of class or JAR information are inescapable the usage of codebase. The URL may quest recommendation from a belt of a directory within the endemic file system or on the internet. instance three-7 retrieves the entire permissions granted to a specific classification that is been loaded from a code base. The permissions are effective best if the security manager is installed. The loaded category uses these permissions by means of executing type.getProtectionDomain() and coverage.getPermissions().

    illustration 3-7. using codebase type URL codebase = null; are trying // gain permissions for a URL codebase = new URL("http://coresecuritypatterns.com/"); trap (MalformedURLException e) seize (IOException e) // assemble a code source with the code base CodeSource cs = new CodeSource(codebase, null); // gain bar null granted permissions PermissionCollection pcoll = policy.getPolicy().getPermissions(cs); // View every leave within the leave assortment Enumeration enum = pcoll.elements(); for (; enum.hasMoreElements(); ) leave p = (Permission)enum.nextElement(); system.out.println("Permission " + p);

    To check instance 3-7, instance 3-8 is the policy file (examine.coverage), which gives leave to examine bar null gadget homes.

    example three-eight. coverage file for checking out permissions to a codebase vouchsafe codebase "http://coresecuritypatterns.com/-" // supply leave to read bar null device homes leave java.util.PropertyPermission "*", "examine"; ;

    to ignore the default guidelines in the java.protection file, and best consume the distinctive coverage, consume '==' as an alternative of '='. With the policy just introduced, you may additionally Run perquisite here:

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

    CodeSource: The CodeSource allows for illustration of a URL from which a category become loaded and the certificates keys that tolerate been used to note that classification. It provides the equal concept as codebase, nonetheless it encapsulates the codebase (URL) of the code where it's loaded and additionally the certificates keys that were used to determine the signed code. The CodeSource classification and its two arguments to specify the code location and its associated certificate keys are as follows:

    CodeSource(URL url, java.security.cert.certificates certs[]);

    To construct a code supply with the code basis and without the usage of certificates, you could consume the following:

    CodeSource cs = new CodeSource(codebase, null);

    Bytecode verifier: The Java bytecode verifier is a vital fragment of the JVM that performs the censorious position of verifying the code prior to execution. It ensures that the code became produced per standards by artery of a staunch compiler, confirms the structure of the classification file, and proves that the chain of Java byte codes are felony. With bytecode verification, the code is proved to subsist internally constant following many of the suggestions and constraints defined by the Java language compiler. The bytecode verifier can besides additionally celebrate inconsistencies involving Definite circumstances of array bound-checking and object-casting through runtime enforcement.

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

  • -Xverify:far off runs verification technique on courses loaded over community (default)
  • -Xverify:all verifies bar null classes loaded
  • -Xverify:none does no verification
  • ClassLoader: The ClassLoader plays a Definite duty in Java safety, since it is primarily accountable for loading the Java courses into the JVM and then changing the uncooked statistics of a class into an inside records structure representing the category. From a safety standpoint, class loaders can subsist used to establish safety guidelines before executing untrusted code, to examine digital signatures, etc. To enforce protection, the class loader coordinates with the protection manager and entry controller of the JVM to verify the protection guidelines of a Java application. The nature loader extra enforces security with the aid of defining the namespace separation between courses that are loaded from divide areas, together with networks. This ensures that courses loaded from numerous hosts will not communicate inside the equal JVM area, thus making it impossible for untrusted code to gain suggestions from trusted code. The nature loader finds out the Java utility's entry privileges using the security manager, which applies the necessary safety coverage based on the requesting context of the caller software.

    With the Java 2 platform, bar null Java purposes tolerate the ability of loading bootstrap classes, system classes, and application courses at first the usage of an interior category loader (also referred to as primordial category loader). The primordial classification loader uses a unique nature loader SecureClassLoader to protect the JVM from loading malicious courses. This java.safety.SecureClassLoader classification has a covered constructor that buddies a loaded category to a insurance diagram area. The SecureClassLoader besides makes consume of permissions set for the codebase. for example, URLClassLoader is a subclass of the SecureClassLoader. URLClassLoader permits loading a category or belt specified with a URL.

    confer with illustration 3-9, which suggests how a URLClassLoader can besides subsist used to load courses from a listing.

    instance three-9. the consume of URLClassLoader // Create a File remonstrate on the basis of the // listing containing the category file File file = new File("c:\\myclasses\\"); are trying // transform File to a URL URL url = file.toURL(); URL[] urls = new URL[]url; // Create a new nature loader with the directory ClassLoader myclassloader = new URLClassLoader(urls); // Load in the classification; // MyClass.type should silent subsist observed in // the directory file:/c:/myclasses/com/security nature myclass = myclassloader.loadClass("com.protection.MySecureClass"); trap (MalformedURLException e) capture (ClassNotFoundException e)

    Keystore and Keytool: The Java 2 platform gives a password-blanketed database facility for storing trusted certificate entries and key entries. The keytool permits the users to create, manipulate, and administer their personal public/private key pairs and linked certificates that are meant for consume in authentication features and in representing digital signatures.

    we can rob a eye in more suitable ingredient at the utilization of the Java keystore and keytool and the artery these tools champion Java safety within the fragment entitled "Java safety management tools," later during this chapter.

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