linux hardening

Making a class singleton makes its client-side testing very difficult, because Singleton cannot be replaced by a simulated implementation unless it implements an interface that acts as its type.There are two ways to implement Singleton before java1.5. Both methods are to keep the constructor private and to export the public static members to allow the client to access the unique instance of the class. Run in single-threaded conditions.Method One: Public domain method, Advantage: the declaration

easy to maintain.JavaScript functions can encapsulate a program that may be used multiple times in a program, and can be invoked as an event-driven result, to implement a function that is associated with event-driven, which is different from other languages.In JavaScript, functions are defined by the keyword function, which can have multiple parameters. The basic format is:function function name (parameter 1, parameter 2) { function body; return return value;}When calling (using) a function,

★ Welcome to The Guardian God · V Classroom, website address: http://v.huweishen.com★ Guardian God · V Classroom is a Web site dedicated to providing server instructional video for the Guardian God, updated weekly video.★ This section we will lead you: Server Security Hardening• Due to the wide variety of security factors and different server settings, this section can only introduce a few aspects of security hardeningSurface.• If you need professiona

Parameter hardening usually refers to defining a dataset SQL statement such as SELECT * from [TableName] where [colname] = ${para}, where the contents of ${} are variables and the report tool will ${} After the content is computed, the resulting string is stitched into SQL to form the final executable query statement, which is sent to the database side for execution. ${} You can use the functions in the report to manipulate the parameters, which is th

usingSystem;usingSystem.Collections.Generic;usingSystem.Diagnostics;usingSystem.Linq;usingSystem.Text;usingSystem.Threading.Tasks;namespaceFoundation Hardening {classProgram {Static voidMain (string[] args) { /*//Non-static method, can instantiate//get current All processes process[] Pro = Process.getprocesses (); foreach (var item in Pro) {Console.WriteLine (item. ProcessName); } */ /*//Use the process to o

Hardening Instructions: Select the element that belongs to the first (last) position in the collection of child elements in its parent element and all sibling elementsNote and: The difference between first:lastInstance:[jquery position selector: First-child:last-child] Hardening Description: Select the element that belongs to the first (last) position in the collection of child elements belonging to its par

The following configuration is used for my formal environment. More than Apache before, now basically not. Now share it.1. 2. Use rewrite to harden Apache # # # # # # # # # #APACHE url keyword Hardening Strategy # # # # # #请自行添加删减关键字 #并做好测试 Examples are as follows: Rewriteengineonrewritecond%{request_uri}xwork|java|redirect|passwd|hosts|windows|script | SCRIPT|LOCATION|PROMPT|PROC\/SELF\/ENVIRON|MOSCONFIG_[A-ZA-Z_]{1,21} (=|%3d) |base64_encode.* (.

Android Hardening: Service and communication steps 1:android services and applications This step will introduce you to the radio receivers and services in the four major Android components, as well as the technology application and onsite protection commonly used by Android. I believe that by learning the above content, you can easily complete the mobile app Assistant's comprehensive case ~ the 1th broadcast receiver of this course, the system broadca

member server hardening procedures." The following table lists all the IPSEC filters that can be created on the IIS server in the Advanced Security environment defined in this guidance. Service Agreement Source Port Target Port Source Address Destination Address Operation Mirror Terminal Services Tcp All 3389 All ME Allow Is HTTP Server Tcp All 80 All ME Allow Is HTTPS Server Tcp All 443 All ME Allow Is When you implement the rules listed in the prev

Overview This chapter provides information about working with Microsoft? Windows Server? Recommendations and resources for security hardening on Internet Authentication Service (IAS) servers above 2003. IAS is a Remote Authentication Dial-In User Service (RADIUS) server that implements the functions of user authentication, authorization, and centralized management of accounts. IAS can be used to authenticate users in Windows Server 2003, Windows NT 4.

Introduction Container technology has radically changed the way that applications, are, being developed and deployed. Notably, containers dramatically ease dependency management, so shipping new features or the code is faster than the ever. While Docker containers and kubernetes are great for DevOps, they also present new security challenges Practitioners and developers must understand with diligence. Docker ' team's security experts has built some valuable security features to the Docker platf

and no permission-related information is logged. When Admin.system.users is not available to a user, even if the-auth parameter is added when MongoDB starts, if no user is added to the admin database, no authentication can be done at this time (regardless of whether it is started with the-auth parameter). Until you add a user to the admin.system.users. The core scenario for hardening is to implement MongoDB's authentication and authorization services

AnalysisIn a malicious sample family that is hardened with this type of development pattern, we select one of the families that steals the user's contacts for analysis, and the anti-compilation classes.dex is visible, and the code for the main malicious behavior is not in Classes.dex:Classes.dex's class structure, which does not contain any meaningful codeWhile actually running, the virus's logic is as follows:1. EntranceThe program registers "Android.app.NativeActivity" in the Androidmanifest.

be allocated on the heap, the reference count is appropriate for OC. But the reference count maintenance cost is slightly higher, and error-prone, too many reference counts, resulting in memory leaks, too little, there are wild pointers, for inexperienced programmers, it is difficult to balance, need to be familiar with the mechanism, and familiar with the corresponding API. So the advanced compiler supports automatic reference counting, the work of reference counting is given to the compiler,

it is a suffix plus (i++), you will "assign a value (to a temporary variable) and then add 1". The final use of the operation is not the variable itself, but the temporary variable assigned the value. 2 3 that is, in the Method_1 method4[Java] View plaincopyprint?5J = j + +; 6 7 equivalent to:8[Java] View plaincopyprint?9 inttemp =J; Tenj = j + 1; Onej =temp; A - in the Method_2 method - the[Java] View plaincopyprint? -j = + +J; - equivalent to: - +[Java] View plaincopyprint? -j = j

The length property in 1.java is for arrays , for example, you declare an array, and you want to know the length of the array is used for this property.The length () method in 2.java is for string strings , and if you want to see the length of the string, use Length () .The size () method in 3.java is said for a generic collection , and if you want to see how many elements the generic has, call this method to view it!This example demonstrates the use of both methods and a property:Public stati

1. Case Demo:1 Packagecn.itcast_07;2 3 ImportJava.util.Scanner;4 5 /*6 * Reverse the string7 */8 Public classStringBufferTest3 {9 Public Static voidMain (string[] args) {Ten //Keyboard input Data OneScanner sc =NewScanner (system.in); ASystem.out.println ("Please enter data:"); -String s =sc.nextline (); - the //Mode 1: concatenation with string -String S1 =Myreverse (s); -System.out.println ("S1:" +s1); - //Mode 2: Use StringBuffer's reverse () function +String

: I want to delete e this character, swollen ? + //Sb.deletecharat (1); //The index of the ' e ' character to be deleted is 1 - //need: I want to delete the first l this character , swollen ? + //Sb.deletecharat (1); The//deletecharat method returns the string buffer StringBuffer the object itself, which has changed to "Hlloworldjava", so the 1th ' L ' index is 1 A(2) at //Public stringbuffer Delete (int start,int - //End ): Deletes the end of the specif

1.Object classclass object is the root class of a class hierarchy, and each class uses object as a superclass. All objects (including arrays) implement this class of methods each class directly or indirectly inherits from the object class 2.Object class without a parameter construct:publicObject () Recall the object-oriented why: The constructor method of a subclass is accessed by default for the parameterless construction of the parent class. A: This is because the common Father object of all

=s.getbytes (); + for(intx = 0; x ) { A System.out.println (bys[x]); at } -System.out.println ("----------------"); - - //char[] ToCharArray (): Converts a string to a character array. - Char[] CHS =S.tochararray (); - for(intx = 0; x ) { in System.out.println (chs[x]); - } toSystem.out.println ("----------------"); + - //static string ValueOf (char[] CHS): Turns the character array into a string. theString SS =string.valueof (CHS);