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annotate src/net/sourceforge/jsocks/server/ServerAuthenticatorNone.java @ 400:e856ecf87b10

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Backed out changeset aeb8c2e6d83a
author Carl Byington <carl@five-ten-sg.com>
date Mon, 20 Oct 2014 19:12:52 -0700
parents 72de889ecfe7
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1 package net.sourceforge.jsocks.server;
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2 import net.sourceforge.jsocks.ProxyMessage;
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3 import net.sourceforge.jsocks.UDPEncapsulation;
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4
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5 import java.io.IOException;
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6 import java.io.InputStream;
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7 import java.io.DataInputStream;
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8 import java.io.OutputStream;
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9 import java.io.PushbackInputStream;
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10 import java.net.Socket;
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11
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12 /**
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13 An implementation of ServerAuthenticator, which does <b>not</b> do
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14 any authentication.
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15 <P>
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16 <FONT size="+3" color ="FF0000"> Warning!!</font><br> Should not be
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17 used on machines which are not behind the firewall.
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18 <p>
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19 It is only provided to make implementing other authentication schemes
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20 easier.<br>
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21 For Example: <tt><pre>
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22 class MyAuth extends socks.server.ServerAuthenticator{
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23 ...
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24 public ServerAuthenticator startSession(java.net.Socket s){
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25 if(!checkHost(s.getInetAddress()) return null;
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26 return super.startSession(s);
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27 }
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28
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29 boolean checkHost(java.net.Inetaddress addr){
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30 boolean allow;
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31 //Do it somehow
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32 return allow;
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33 }
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34 }
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35 </pre></tt>
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36 */
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37 public class ServerAuthenticatorNone implements ServerAuthenticator{
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38
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39 static final byte[] socks5response = {5,0};
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40
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41 InputStream in;
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42 OutputStream out;
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43
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44 /**
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45 Creates new instance of the ServerAuthenticatorNone.
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46 */
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47 public ServerAuthenticatorNone(){
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48 this.in = null;
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49 this.out = null;
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50 }
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51 /**
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52 Constructs new ServerAuthenticatorNone object suitable for returning
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53 from the startSession function.
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54 @param in Input stream to return from getInputStream method.
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55 @param out Output stream to return from getOutputStream method.
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56 */
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57 public ServerAuthenticatorNone(InputStream in, OutputStream out){
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58 this.in = in;
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59 this.out = out;
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60 }
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61 /**
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62 Grants access to everyone.Removes authentication related bytes from
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63 the stream, when a SOCKS5 connection is being made, selects an
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64 authentication NONE.
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65 */
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66 public ServerAuthenticator startSession(Socket s)
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67 throws IOException{
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68
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69 PushbackInputStream in = new PushbackInputStream(s.getInputStream());
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70 OutputStream out = s.getOutputStream();
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71
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72 int version = in.read();
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73 if(version == 5){
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74 if(!selectSocks5Authentication(in,out,0))
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75 return null;
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76 }else if(version == 4){
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77 //Else it is the request message allready, version 4
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78 in.unread(version);
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79 }else
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80 return null;
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81
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82
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83 return new ServerAuthenticatorNone(in,out);
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84 }
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85
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86 /**
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87 Get input stream.
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88 @return Input stream speciefied in the constructor.
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89 */
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90 public InputStream getInputStream(){
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91 return in;
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92 }
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93 /**
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94 Get output stream.
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95 @return Output stream speciefied in the constructor.
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96 */
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97 public OutputStream getOutputStream(){
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98 return out;
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99 }
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100 /**
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101 Allways returns null.
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102 @return null
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103 */
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104 public UDPEncapsulation getUdpEncapsulation(){
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105 return null;
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106 }
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107
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108 /**
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109 Allways returns true.
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110 */
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111 public boolean checkRequest(ProxyMessage msg){
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112 return true;
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113 }
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114
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115 /**
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116 Allways returns true.
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117 */
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118 public boolean checkRequest(java.net.DatagramPacket dp, boolean out){
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119 return true;
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120 }
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121
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122 /**
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123 Does nothing.
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124 */
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125 public void endSession(){
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126 }
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127
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128 /**
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129 Convinience routine for selecting SOCKSv5 authentication.
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130 <p>
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131 This method reads in authentication methods that client supports,
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132 checks wether it supports given method. If it does, the notification
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133 method is written back to client, that this method have been chosen
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134 for authentication. If given method was not found, authentication
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135 failure message is send to client ([5,FF]).
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136 @param in Input stream, version byte should be removed from the stream
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137 before calling this method.
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138 @param out Output stream.
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139 @param methodId Method which should be selected.
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140 @return true if methodId was found, false otherwise.
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141 */
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142 static public boolean selectSocks5Authentication(InputStream in,
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143 OutputStream out,
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144 int methodId)
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145 throws IOException{
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146
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147 int num_methods = in.read();
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148 if (num_methods <= 0) return false;
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149 byte method_ids[] = new byte[num_methods];
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150 byte response[] = new byte[2];
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151 boolean found = false;
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152
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153 response[0] = (byte) 5; //SOCKS version
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154 response[1] = (byte) 0xFF; //Not found, we are pessimistic
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155
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156 int bread = 0; //bytes read so far
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157 while(bread < num_methods)
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158 bread += in.read(method_ids,bread,num_methods-bread);
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159
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160 for(int i=0;i<num_methods;++i)
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161 if(method_ids[i] == methodId){
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162 found = true;
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163 response[1] = (byte) methodId;
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164 break;
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165 }
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166
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167 out.write(response);
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168 return found;
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169 }
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170 }