Question

Java Netbeans code

Option 1: Authentication System
For security-minded professionals, it is important that only the appropriate people gain access to data in a computer system. This is called authentication. Once users gain entry, it is also important that they only see data related to their role in a computer system. This is called authorization. For the zoo, you will develop an authentication system that manages both authentication and authorization. You have been given a credentials file that contains credential information for authorized users. You have also been given three files, one for each role: zookeeper, veterinarian, and admin. Each role file describes the data the particular role should be authorized to access. Create an authentication system that does all of the following:
* Asks the user for a username
* Asks the user for a password
* Converts the password using a message digest five (MD5) hash
o It is not required that you write the MD5 from scratch. Use the code located in this document and follow the comments in it to perform this operation.
* Checks the credentials against the valid credentials provided in the credentials file
o Use the hashed passwords in the second column; the third column contains the actual passwords for testing and the fourth row contains the role of each user.
* Limits failed attempts to three before notifying the user and exiting the program
* Gives authenticated users access to the correct role file after successful authentication
o The system information stored in the role file should be displayed. For example, if a zookeeper’s credentials is successfully authenticated, then the contents from the zookeeper file will be displayed. If an admin’s credentials is successfully authenticated, then the contents from the admin file will be displayed.
* Allows a user to log out
* Stays on the credential screen until either a successful attempt has been made, three unsuccessful attempts have been made, or a user chooses to exit
You are allowed to add extra roles if you would like to see another type of user added to the system, but you may not remove any of the existing roles.

credentials file:

griffin.keyes   108de81c31bf9c622f76876b74e9285f        "alphabet soup" zookeeper
rosario.dawson  3e34baa4ee2ff767af8c120a496742b5        "animal doctor" admin
bernie.gorilla  a584efafa8f9ea7fe5cf18442f32b07b        "secret password"       veterinarian
donald.monkey   17b1b7d8a706696ed220bc414f729ad3        "M0nk3y business"       zookeeper
jerome.grizzlybear      3adea92111e6307f8f2aae4721e77900        "grizzly1234"   veterinarian
bruce.grizzlybear       0d107d09f5bbe40cade3de5c71e9e9b7        "letmein"       admin

Zookeeper file:

Hello, Zookeeper!

As zookeeper, you have access to all of the animals' information and their daily monitoring logs. This allows you to track their feeding habits, habitat conditions, and general welfare.

Veterinarian file:

Hello, Veterinarian!

As veterinarian, you have access to all of the animals' health records. This allows you to view each animal's medical history and current treatments/illnesses (if any), and to maintain a vaccination log.

Admin file:

Hello, System Admin!

As administrator, you have access to the zoo's main computer system.  This allows you to monitor users in the system and their roles.

MD5 file:

import java.security.MessageDigest;

public class MD5Digest {

   public static void main(String[] args) throws Exception {
    
      //Copy and paste this section of code
       String original = "letmein"; //Replace "password" with the actual password inputted by the user
       MessageDigest md = MessageDigest.getInstance("MD5");
       md.update(original.getBytes());
       byte[] digest = md.digest();
      StringBuffer sb = new StringBuffer();
       for (byte b : digest) {
           sb.append(String.format("%02x", b & 0xff));
       }
      //End copy/paste

       System.out.println("original:" + original);
       System.out.println("digested:" + sb.toString()); //sb.toString() is what you'll need to compare password strings
   }

}

Answer 1

Solution: The iava code for authentication problem is shown below: //Include libraries import java.io.BufferedReader; import java.io.FileReader; import java.io. IOException,; import java.io. InputStreamReader; import java.security.MessageDigest; import java.security. NoSuchAlgorithmException; import java.util.Scanner; import java.io. FileNotFoundException; //Define a class Secretproc public class Secretproc //Define main public static void main (String[] args) throws IOException //call methood loginScreenpro ); //Define a method public static void loginScreenpro () //Define string variable String gPassword"" //Declare variables int flag123 = 0, attempts!23-3; //Define reader BufferedReader brl - new BufferedReader (new InputStreamReader (System.in)); //Display message System.out.println (" InLogin"); //Try block try

//Do do //Decrement value attempts123 //Display message System.out.println ("Enter Username"); //Store value String userName- brl.readLine (); //Display message System.out.println ("Enter Password"); //store value string password brl.readLine) //Create an instance MessageDigest md123 = MessageDigest.getInstance ("md5") //Update md123.update (password.getBytes //call methood byte[] bytes12md123.digest ) //create an instance StringBuilder lsbl new StringBuilder ) / /Loop for (int k = 0; k < bytes12.length; k++) //Append 1Sb1.append (Integer.toString ( (bytes12 [k] &0xff) + 0x100, 16) . substring (1))

//Generate password gPassword1Sb1.toString ); //Declare variable String currentLine; //Define an instance BufferedReader bin123 new BufferedReader (new FileReader ("Credentials.txt"; //Loop until end of file while ((currentLine - bin123.readLine ()) !- null) //split each line of file string[] array!23 = currentLine. Split ("\t"); //If user name matches if (array123 [0].equals (userName) ) //If password matches if (array123 [1].equals (gPassword)) //Store file name string x = array!23 [3]; //Define file reader BufferedReader br2 null; //Declare variable string strLinel""; //open file br2 = new BufferedReader( new FileReader (x+".txt")) //Loop until file end while( (strLine1 br2.readLine ())! null)

//Display contents System.out.println (strLine1); //Assign value flag1231i //Break break; //If attempt is 0 if (attempts123 0) //Display message System.out.println("login more times"); //Display message System.out.println ("Exit. . ."); //Exit System.exit (1) //If flag is1 if (flag123- 1) //call methood adminScreenpro ); //Break break; //otherwise else

//Display message System.out.println"Invalid Username or Password."); //Display message System.out.println(" try again.") //Display message System.out.println (attempts123+" more attemptes left.\n"); //Loop while (attempts123 0); //Define catch catch (NoSuchAlgorithmException el) //Trace e1.printStackTrace (); //Define catch block catch IOException el) //Trace e1.printStackTrace ) //Define a method public static void adminScreenpro () //Declare variable string logout123; //Define scanner variable Scanner sc1= new Scanner (System.in);

//Display message System.out.println ("\nWelcome Admin"); //Display message System.out.println ("user Press 99 for log out\n"); //Do loop do //store value logout123 = sc1.nextLine(); //Loop while (!logout123.equals ("99")) //If value is 99 if (logout123.equals ("99") ) //Call method loginScreenpro ) Input file sokeper-Nctepad Hello, zookeeper s zo keeper, you have access to all of the aniais inforttin and their daily n ritoring ไ0gs. This allos you to track their feeding habits, habitat corditi rs, and general welfare.

you have access to all of the anisals' health records. This alos you to view each aninal's nedical history ard current treatnents/il1lnesses (if any), and to naintain a vaccination 1og Hel1o, Systen Admin administrator, you have access to the 200's nain computer system. This allows you to monitor users in the systes and their roles. Credentials Notepad File Edit Format Yiew Help griffin. keyes 108de81c31bf9c622f76876b74e9285f rosario. dawson 3e34baa4 ee2ff767af8c120a496742b5 bernie. gori11a a584efaf a8f9ea7feScf18442f 32b07b donald. monke alphabet soup" zookeeper "anima1 doctor" admin secret passwor d MOnk3y business" 17b1b7d8a706696ed220bc414f729ad3 veterinar 1an zookeeper erome. grizzlybear ruce. grizzlybear 3adea92111e6307f8f2aae4721e77900 0d107d09f 5bbe40cade3de5c71e9e9b7 rizzly1234" veterinarian etmein" admin Sample Output: D: \Program Files\Javaljdkl.8.0_401bin>javac Secretproc.java D: \Program Files Javaljdkl.8.0_40\bin>java Secretproc Login Enter Username griffin.keyes Enter Password alphabet soup Hello, Zookeeper!

As zookeeper, you have access to all of the animals' information and their daily monitoring logs. This allows you to track their feeding habits, habitat conditi ons, and general welfare Welcome Admin user Press 99 or log out Login Enter Username griffins.keye:s Enter Password alphabet Invalid Username or Password try again. 2 more attemptes left. Enter Username griffins.keye:s Enter Password soup Invalid Username or Password try again. 1 more attemptes left. Enter Username griffins.keye:s Enter Password alphabetsoup login more times Exit. . D: \Program Files\Java\jdkl.8.0 40\bin>

Code:

//Include libraries

import java.io.BufferedReader;

import java.io.FileReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

import java.util.Scanner;

import java.io.FileNotFoundException;

//Define a class Secretproc

public class Secretproc

{

     //Define main

     public static void main(String[] args) throws IOException

     {

          //Call method

          loginScreenpro();

     }

     //Define a method

     public static void loginScreenpro()

     {

          //Define string variable

          String gPassword = "";            

          //Declare variables

          int flag123 = 0,attempts123=3;

          //Define reader

BufferedReader br1 = new BufferedReader(new InputStreamReader(System.in));     

          //Display message

          System.out.println("\nLogin");

          //Try block

          try

          {

              //Do

              do

              {

                   //Decrement value

                   attempts123--;

                   //Display message

                   System.out.println("Enter Username");

                   //Store value

                   String userName = br1.readLine();

                   //Display message

                   System.out.println("Enter Password");

                   //Store value

                   String password = br1.readLine();

                   //Create an instance

MessageDigest md123 = MessageDigest.getInstance("md5");

                   //Update

                   md123.update(password.getBytes());

                   //Call method

                   byte[] bytes12 = md123.digest();

                   //Create an instance

                   StringBuilder lSb1 = new StringBuilder();

                   //Loop

                   for (int k = 0; k < bytes12.length; k++)

                   {

                        //Append

lSb1.append(Integer.toString((bytes12[k] & 0xff) + 0x100, 16).substring(1));

                   }

                   //Generate password

                   gPassword = lSb1.toString();

                   //Declare variable

                   String currentLine;

                   //Define an instance

BufferedReader bin123 = new BufferedReader(new FileReader("Credentials.txt"));

                    //Loop until end of file

                   while ((currentLine = bin123.readLine()) !=                             null)

                   {                 

                        //Split each line of file

String[] array123 = currentLine.split("\t");

                        // If user name matches

                        if (array123[0].equals(userName))

                        {

                             //If password matches

                             if (array123[1].equals(gPassword))

                             {                           

                                  //Store file name                              

                                  String x = array123[3];

                                  //Define file reader

                                  BufferedReader br2 = null;

                                  //Declare variable

                                  String strLine1 = "";

                                  //Open file

br2 = new BufferedReader( new FileReader(x+".txt"));

                                  //Loop until file end

while( (strLine1 = br2.readLine()) != null)

                                  {

                                      //Display contents

                                                                                   System.out.println(strLine1);

                                  }

    

                                  //Assign value

                                  flag123 = 1;

                                  //Break

                                  break;

                             }

                        }

                   }

                   //If attempt is 0

                   if(attempts123==0)

                   {

                        //Display message

                        System.out.println("login more times");

                        //Display message

                        System.out.println("Exit...");

                        //Exit

                        System.exit(1);

                   }

             

                   //If flag is 1

                   if (flag123 == 1)

                   {

                        //Call method

                        adminScreenpro();

                        //Break

                        break;

                   }

                   //Otherwise

                   else

                   {

                        //Display message

System.out.println("Invalid Username or Password.");

                        //Display message

                        System.out.println(" try again.");                   

                        //Display message

System.out.println(attempts123+" more attemptes left.\n");

                   }

              }

              //Loop

              while(attempts123>0);

          }

          //Define catch

          catch (NoSuchAlgorithmException e1)

          {

              //Trace

              e1.printStackTrace();

          }

          //Define catch block

          catch (IOException e1)

          {

              //Trace

              e1.printStackTrace();

          }

     }

     //Define a method

     public static void adminScreenpro()

     {

          //Declare variable  

          String logOut123;

          //Define scanner variable

          Scanner sc1= new Scanner(System.in);

          //Display message

          System.out.println("\nWelcome Admin");       

          //Display message

          System.out.println("user Press 99 for log out\n");

          //Do loop

          do

          {

              //Store value

              logOut123 = sc1.nextLine();

          }

          //Loop

          while(!logOut123.equals("99"));

          //If value is 99

          if(logOut123.equals("99"))

          {

              //Call method

              loginScreenpro();

          }

     }

}