Secure Coding Guidelines Java Pdf Download ->->->-> https://tiurll.com/1ntjji
Guideline 7-5 / OBJECT-5: Defend against cloning of non-final classes A non-final class may be subclassed by a class that also implements java.lang.Cloneableprivate void checkGrowBy(long extra) { if (extra max - extra) { throw new IllegalArgumentException(); } } If performance is not a particular issue, a verbose approach is to use arbitrary sized integersFor instance, java.net.HttpCookie is mutable but final and provides a public clone method for acquiring copies of its instancesDeclarations and Initialization (DCL) Page: Rule 02Both the copy and the original share references to the same elementsLikewise, an object only reachable as an implementation of an upcall need not validate its inputsGuideline 0-2 / FUNDAMENTALS-2: Avoid duplication Duplication of code and data causes many problemspublic class NonFinal { // sole accessible constructor public NonFinal() { this(securityManagerCheck()); } private NonFinal(Void ignored) { // Only include known, acceptable information from an exception rather than filtering out some elements of the exception
Java is a trademark or registered trademark of Oracle, IncThe Java Plugin, for example, loads unrelated applets into separate class loader instances and runs them in separate thread groupsThis approach allows code to assert a subset of its privileges while still allowing a full access-control stack walk to check for other permissionsThese guidelines are of interest to all Java developers, whether they create trusted end-user applications and applets, implement the internals of a security component, or develop shared Java class libraries that perform common programming tasksRMI may allow loading of remote code specified by remote connection
More generally, validating external inputs is an important part of securityOn the Oracle JDK, this is disabled by default but may be enabled or disabled through the com.sun.jndi.ldap.object.trustURLCodebase system propertyIt is easy to overlook the vast possibilities for executions paths when exceptions are thrownJNI-7: Perform input validation at the language boundary To provide in-depth protection against security issues with native memory access, the input passed from the Java layer requires revalidation on the native sideWhile there are security checks, the state is still intended to remain within the contextWhen decompressing files it is better to set limits on the decompressed data size rather than relying upon compressed size or meta-data
Any attempts to use the class before it is fully initialized will result in a NullPointerExceptionFor unusual formats where appropriate libraries do not exist, such as configuration files, create classes that cleanly handle all formatting and only formatting codeOften no security permissions are necessary to access this state, so it cannot be trusted (other than for Same Origin Policy within PlugIn and WebStart)Guideline 6-10 / MUTABLE-10: Ensure public static final field values are constants Only immutable or unmodifiable values should be stored in public static fieldsEqually, a web server is outside of the system for a web browserIn rare cases it may not be practical to ensure that the input is reasonableIn some cases, notably collections, a method may require a deeper copy of an input object than the one returned via that input’s copy constructor or clone methodMany forms of attack require knowing or guessing locations of files"Zip bombs" whereby a short file is very highly compressedPrefer composition to inheritance
private static final String PACKAGEACCESSKEY = "package.access"; static { String packageAccess = java.security.Security.getProperty( PACKAGEACCESSKEY ); java.security.Security.setProperty( PACKAGEACCESSKEY, ( (packageAccess == null packageAccess.trim().isEmpty()) ? "" : (packageAccess + ",") ) + "xx.example.product.implementation." ); } Guideline 4-3 / EXTEND-3: Isolate unrelated code Containers, that is to say code that manages code with a lower level of trust, should isolate unrelated application codeGuideline 2-3 / CONFIDENTIAL-3: Consider purging highly sensitive from memory after use To narrow the window when highly sensitive information may appear in core dumps, debugging, and confidentiality attacks, it may be appropriate to zero memory containing the data immediately after use rather than waiting for the garbage collection mechanismThis is because an integer conversion of a NaN value will result in a 0, and a positive infinite value is transformed to Integer.MAXVALUE (or Integer.MINVALUE for negative infinity), which may not be correct in certain use casesTherefore, web browser and server software should not rely upon the behavior of the other for securityFrom JDK 6 on, construction of a subclassable class can be prevented by throwing an exception before the Object constructor completes 68ab3a233e
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Guideline 7-5 / OBJECT-5: Defend against cloning of non-final classes A non-final class may be subclassed by a class that also implements java.lang.Cloneableprivate void checkGrowBy(long extra) { if (extra max - extra) { throw new IllegalArgumentException(); } } If performance is not a particular issue, a verbose approach is to use arbitrary sized integersFor instance, java.net.HttpCookie is mutable but final and provides a public clone method for acquiring copies of its instancesDeclarations and Initialization (DCL) Page: Rule 02Both the copy and the original share references to the same elementsLikewise, an object only reachable as an implementation of an upcall need not validate its inputsGuideline 0-2 / FUNDAMENTALS-2: Avoid duplication Duplication of code and data causes many problemspublic class NonFinal { // sole accessible constructor public NonFinal() { this(securityManagerCheck()); } private NonFinal(Void ignored) { // Only include known, acceptable information from an exception rather than filtering out some elements of the exception
Java is a trademark or registered trademark of Oracle, IncThe Java Plugin, for example, loads unrelated applets into separate class loader instances and runs them in separate thread groupsThis approach allows code to assert a subset of its privileges while still allowing a full access-control stack walk to check for other permissionsThese guidelines are of interest to all Java developers, whether they create trusted end-user applications and applets, implement the internals of a security component, or develop shared Java class libraries that perform common programming tasksRMI may allow loading of remote code specified by remote connection
More generally, validating external inputs is an important part of securityOn the Oracle JDK, this is disabled by default but may be enabled or disabled through the com.sun.jndi.ldap.object.trustURLCodebase system propertyIt is easy to overlook the vast possibilities for executions paths when exceptions are thrownJNI-7: Perform input validation at the language boundary To provide in-depth protection against security issues with native memory access, the input passed from the Java layer requires revalidation on the native sideWhile there are security checks, the state is still intended to remain within the contextWhen decompressing files it is better to set limits on the decompressed data size rather than relying upon compressed size or meta-data
Any attempts to use the class before it is fully initialized will result in a NullPointerExceptionFor unusual formats where appropriate libraries do not exist, such as configuration files, create classes that cleanly handle all formatting and only formatting codeOften no security permissions are necessary to access this state, so it cannot be trusted (other than for Same Origin Policy within PlugIn and WebStart)Guideline 6-10 / MUTABLE-10: Ensure public static final field values are constants Only immutable or unmodifiable values should be stored in public static fieldsEqually, a web server is outside of the system for a web browserIn rare cases it may not be practical to ensure that the input is reasonableIn some cases, notably collections, a method may require a deeper copy of an input object than the one returned via that input’s copy constructor or clone methodMany forms of attack require knowing or guessing locations of files"Zip bombs" whereby a short file is very highly compressedPrefer composition to inheritance
private static final String PACKAGEACCESSKEY = "package.access"; static { String packageAccess = java.security.Security.getProperty( PACKAGEACCESSKEY ); java.security.Security.setProperty( PACKAGEACCESSKEY, ( (packageAccess == null packageAccess.trim().isEmpty()) ? "" : (packageAccess + ",") ) + "xx.example.product.implementation." ); } Guideline 4-3 / EXTEND-3: Isolate unrelated code Containers, that is to say code that manages code with a lower level of trust, should isolate unrelated application codeGuideline 2-3 / CONFIDENTIAL-3: Consider purging highly sensitive from memory after use To narrow the window when highly sensitive information may appear in core dumps, debugging, and confidentiality attacks, it may be appropriate to zero memory containing the data immediately after use rather than waiting for the garbage collection mechanismThis is because an integer conversion of a NaN value will result in a 0, and a positive infinite value is transformed to Integer.MAXVALUE (or Integer.MINVALUE for negative infinity), which may not be correct in certain use casesTherefore, web browser and server software should not rely upon the behavior of the other for securityFrom JDK 6 on, construction of a subclassable class can be prevented by throwing an exception before the Object constructor completes 68ab3a233e
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