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annotate app/src/main/java/net/sourceforge/jsocks/server/IdentAuthenticator.java @ 516:3407f4741240

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update copyrights
author Carl Byington <carl@five-ten-sg.com>
date Fri, 31 May 2024 11:17:53 -0600
parents d29cce60f393
children
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1 package net.sourceforge.jsocks.server;
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2 import net.sourceforge.jsocks.InetRange;
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3 import net.sourceforge.jsocks.ProxyMessage;
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4 import java.util.Hashtable;
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5 import java.util.Vector;
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6 import java.util.Enumeration;
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7 import java.net.*;
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8 import java.io.*;
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9
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10 /**
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11 An implementation of socks.ServerAuthentication which provides
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12 simple authentication based on the host from which the connection
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13 is made and the name of the user on the remote machine, as reported
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14 by identd daemon on the remote machine.
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15 <p>
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16 It can also be used to provide authentication based only on the contacting
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17 host address.
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18 */
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19
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20 public class IdentAuthenticator extends ServerAuthenticatorNone{
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21 /** Vector of InetRanges */
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22 Vector hosts;
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23
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24 /** Vector of user hashes*/
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25 Vector users;
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26
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27 String user;
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28
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29
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30 /**
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31 Constructs empty IdentAuthenticator.
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32 */
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33 public IdentAuthenticator(){
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34 hosts = new Vector();
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35 users = new Vector();
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36 }
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37 /**
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38 Used to create instances returned from startSession.
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39 @param in Input stream.
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40 @param out OutputStream.
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41 @param user Username associated with this connection,could be
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42 null if name was not required.
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43 */
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44 IdentAuthenticator(InputStream in,OutputStream out, String user){
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45 super(in,out);
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46 this.user = user;
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47 }
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48
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49 /**
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50 Adds range of addresses from which connection is allowed. Hashtable
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51 users should contain user names as keys and anything as values
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52 (value is not used and will be ignored).
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53 @param hostRange Range of ip addresses from which connection is allowed.
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54 @param users Hashtable of users for whom connection is allowed, or null
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55 to indicate that anybody is allowed to connect from the hosts within given
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56 range.
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57 */
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58 public synchronized void add(InetRange hostRange,Hashtable users){
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59 this.hosts.addElement(hostRange);
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60 this.users.addElement(users);
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61 }
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62
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63 /**
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64 Grants permission only to those users, who connect from one of the
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65 hosts registered with add(InetRange,Hashtable) and whose names, as
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66 reported by identd daemon, are listed for the host the connection
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67 came from.
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68 */
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69 public ServerAuthenticator startSession(Socket s)
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70 throws IOException{
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71
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72 int ind = getRangeIndex(s.getInetAddress());
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73 String user = null;
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74
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75 //System.out.println("getRangeReturned:"+ind);
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76
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77 if(ind < 0) return null; //Host is not on the list.
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78
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79 ServerAuthenticatorNone auth = (ServerAuthenticatorNone)
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80 super.startSession(s);
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81
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82 //System.out.println("super.startSession() returned:"+auth);
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83 if(auth == null) return null;
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84
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85 //do the authentication
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86
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87 Hashtable user_names = (Hashtable) users.elementAt(ind);
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88
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89 if(user_names != null){ //If need to do authentication
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90 Ident ident;
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91 ident = new Ident(s);
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92 //If can't obtain user name, fail
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93 if(!ident.successful) return null;
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94 //If user name is not listed for this address, fail
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95 if(!user_names.containsKey(ident.userName)) return null;
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96 user = ident.userName;
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97 }
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98 return new IdentAuthenticator(auth.in,auth.out,user);
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99
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100 }
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101 /**
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102 For SOCKS5 requests allways returns true. For SOCKS4 requests
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103 checks wether the user name supplied in the request corresponds
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104 to the name obtained from the ident daemon.
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105 */
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106 public boolean checkRequest(ProxyMessage msg,java.net.Socket s){
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107 //If it's version 5 request, or if anybody is permitted, return true;
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108 if(msg.version == 5 || user == null)
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109 return true;
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110
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111 if(msg.version != 4) return false; //Who knows?
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112
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113 return user.equals(msg.user);
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114 }
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115
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116 /** Get String representaion of the IdentAuthenticator.*/
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117 public String toString(){
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118 String s = "";
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119
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120 for(int i=0;i<hosts.size();++i)
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121 s += "Range:"+hosts.elementAt(i)+"\nUsers:"+userNames(i)+"\n";
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122 return s;
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123 }
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124
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125 //Private Methods
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126 //////////////////
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127 private int getRangeIndex(InetAddress ip){
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128 int index = 0;
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129 Enumeration eEnum = hosts.elements();
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130 while(eEnum.hasMoreElements()){
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131 InetRange ir = (InetRange) eEnum.nextElement();
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132 if(ir.contains(ip)) return index;
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133 index++;
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134 }
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135 return -1; //Not found
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136 }
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137
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138 private String userNames(int i){
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139 if(users.elementAt(i) == null) return "Everybody is permitted.";
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140
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141 Enumeration eEnum = ((Hashtable)users.elementAt(i)).keys();
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142 if(!eEnum.hasMoreElements()) return "";
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143 String s = eEnum.nextElement().toString();
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144 while(eEnum.hasMoreElements())
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145 s += "; "+eEnum.nextElement();
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146
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147 return s;
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148 }
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149
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150 }