UserPasswordAuthenticator


1   package socks.server;
2   
3   import socks.ProxyMessage;
4   import java.io.IOException  ;
5   import java.io.InputStream  ;
6   import java.io.OutputStream  ;
7   import java.net.Socket  ;
8   
9   /**
10    This class implements SOCKS5 User/Password authentication scheme as
11    defined in rfc1929,the server side of it.
12  */
13  public class UserPasswordAuthenticator extends  ServerAuthenticatorNone{
14  
15     static final int METHOD_ID = 2;
16  
17     UserValidation validator;
18  
19     /**
20      Construct a new UserPasswordAuthentication object, with given
21      UserVlaidation scheme.
22  
23      @param v UserValidation to use for validating users.
24     */
25     public UserPasswordAuthenticator(UserValidation validator){
26        this.validator = validator;
27     }
28  
29     public ServerAuthenticator startSession(Socket   s) throws IOException  {
30       InputStream   in = s.getInputStream();
31       OutputStream   out = s.getOutputStream();
32  
33       if(in.read() != 5) return null; //Drop non version 5 messages.
34  
35       if(!selectSocks5Authentication(in,out,METHOD_ID)) 
36         return null;
37       if(!doUserPasswordAuthentication(s,in,out))
38         return null;
39  
40       return new ServerAuthenticatorNone(in,out);
41     }
42  
43  
44  //Private Methods
45  //////////////////
46  
47     private boolean doUserPasswordAuthentication(Socket   s,
48                                                  InputStream   in,
49                                                  OutputStream   out) 
50                                                  throws IOException  {
51       int version = in.read();
52       if(version != 1) return false;
53       int ulen = in.read();
54       if(ulen < 0) return false;
55       byte[] user = new byte[ulen];
56       in.read(user);
57       int plen = in.read();
58       if(plen < 0) return false;
59       byte[] password = new byte[plen];
60       in.read(password);
61  
62       if(validator.isUserValid(new String  (user), new String  (password),s)){
63         //System.out.println("user valid");
64         out.write(new byte[]{1,0});
65       }else{
66         //System.out.println("user invalid");
67         out.write(new byte[]{1,1});
68         return false;
69       }
70  
71       return true;
72     }
73  }
74
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