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  1. import java.io.IOException;
  2. import java.io.OutputStream;
  3. import java.net.InetSocketAddress;
  4. import java.util.Random;
  5. import java.io.File;
  6. import java.io.FileInputStream;
  7. import java.io.FileReader;
  8. import java.io.BufferedReader;
  9. import java.io.InputStreamReader;
  10. import java.util.Map;
  11. import java.util.HashMap;
  12.  
  13. import com.sun.net.httpserver.HttpExchange;
  14. import com.sun.net.httpserver.HttpHandler;
  15. import com.sun.net.httpserver.HttpServer;
  16.  
  17. public class Challenge17 {
  18.  
  19.     static private String data = "";
  20.     static private String adminPassword = "";
  21.     static private String adminUsername = "";
  22.  
  23.     public static void main(String[] args) throws Exception {
  24.         // reading the password from the file
  25.         File filePass = new File("passwordANDusername.txt");
  26.         BufferedReader br = new BufferedReader(new FileReader(filePass));
  27.         adminPassword = br.readLine();
  28.         adminUsername = br.readLine();
  29.         br.close();
  30.  
  31.         // read the challenge file and store it in the data
  32.         File file = new File("flag17.txt");
  33.         br = new BufferedReader(new FileReader(file));
  34.         String line = "";
  35.         while ((line = br.readLine()) != null) data += line + "<br>";
  36.         br.close();
  37.  
  38.         // run the HTTP server to listen for connections
  39.         int port = 7007;
  40.         HttpServer server = HttpServer.create(new InetSocketAddress(port), 0);
  41.         server.createContext("/auth.log", new LogHandler());
  42.         server.createContext("/login/", new LoginHandler());
  43.         server.createContext("/", new IndexHandler());
  44.         server.setExecutor(null);
  45.         server.start();
  46.         System.out.println("Started the server on port " + port + "...");
  47.     }
  48.  
  49.     // this class takes care of the action when the user clicks on Login
  50.     static class LoginHandler implements HttpHandler {
  51.         @Override
  52.         public void handle(HttpExchange t) throws IOException {
  53.             String output = "";
  54.             Map<String, String> GETRequestParams = queryToMap(t.getRequestURI().getQuery());
  55.             if (GETRequestParams.containsKey("username") && GETRequestParams.containsKey("password")) {
  56.                 String username = GETRequestParams.get("username");
  57.                 String password = GETRequestParams.get("password");
  58.  
  59.                 if (username.equals(adminUsername) && password.equals(adminPassword)) {
  60.                     output += data;
  61.                 }
  62.                 else {
  63.                     // all errors will be recorded in auth.log file
  64.                     output += "Username/password are not correct! Good luck next time.";
  65.                 }
  66.             }
  67.             else {
  68.                 output += "GET parameters are wrong, don't mess with us ;)";
  69.             }
  70.  
  71.             generateResponse(t, output);
  72.         }
  73.     }
  74.  
  75.     // this class takes care of the action when the user navigates to this challenge
  76.     static class IndexHandler implements HttpHandler {
  77.         @Override
  78.         public void handle(HttpExchange t) throws IOException {
  79.             generateResponse(t, "Millions of red roses, or red roses for millions");
  80.         }
  81.     }
  82.  
  83.     // this class takes care of the action when the user navigates to this challenge
  84.     static class LogHandler implements HttpHandler {
  85.         @Override
  86.         public void handle(HttpExchange t) throws IOException {
  87.             // read the challenge file and store it in the data
  88.             File file = new File("auth.log");
  89.             BufferedReader br = new BufferedReader(new FileReader(file));
  90.             String line = "";
  91.             String out = "";
  92.             while ((line = br.readLine()) != null) out += line + "<br>";
  93.             br.close();
  94.             generateResponse(t, out);
  95.         }
  96.     }
  97.  
  98.     // a method for a generic response to the user
  99.     static void generateResponse(HttpExchange t, String output) throws IOException {
  100.         String line = "", response = "";
  101.         try {
  102.             File indexFile = new File("index.html").getCanonicalFile();
  103.             BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(new FileInputStream(indexFile)));
  104.             while ((line = bufferedReader.readLine()) != null) {
  105.                 response += line;
  106.             }
  107.             response = response.replaceAll("CONTENT_PLACEMENT", output);
  108.             bufferedReader.close();
  109.         } catch (IOException e) {
  110.             e.printStackTrace();
  111.         }
  112.         t.getResponseHeaders().add("Content-Type", "text/html");
  113.         t.sendResponseHeaders(200, response.length());
  114.         OutputStream os = t.getResponseBody();
  115.         os.write(response.getBytes());
  116.         os.close();
  117.     }
  118.  
  119.     static public Map<String, String> queryToMap(String query) {
  120.         Map<String, String> result = new HashMap<>();
  121.         for (String param : query.split("&")) {
  122.             String[] entry = param.split("=");
  123.             if (entry.length > 1) { // proceed only when there is a pair of parameters
  124.                 result.put(entry[0], entry[1]);
  125.             }
  126.         }
  127.         return result;
  128.     }
  129.  
  130. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
Main.java:17: error: class Challenge17 is public, should be declared in a file named Challenge17.java
public class Challenge17 {
       ^
1 error
stdout
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Standard output is empty
https://ideone.com/v8ExqW
language:
Java (HotSpot 12)
created:
3 years ago
visibility:
public

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