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annotate src/main/java/com/glavsoft/rfb/protocol/state/SecurityTypeState.java @ 52:472a9bcacb21 draft default tip

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TightVNC 2.7.1.0
author you@cr.ie.u-ryukyu.ac.jp
date Wed, 07 Aug 2013 19:01:17 +0900
parents 4689cc86d6cb
children
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1 // Copyright (C) 2010, 2011, 2012, 2013 GlavSoft LLC.
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2 // All rights reserved.
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3 //
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4 //-------------------------------------------------------------------------
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5 // This file is part of the TightVNC software. Please visit our Web site:
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6 //
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7 // http://www.tightvnc.com/
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8 //
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9 // This program is free software; you can redistribute it and/or modify
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10 // it under the terms of the GNU General Public License as published by
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11 // the Free Software Foundation; either version 2 of the License, or
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12 // (at your option) any later version.
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13 //
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14 // This program is distributed in the hope that it will be useful,
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15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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17 // GNU General Public License for more details.
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18 //
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19 // You should have received a copy of the GNU General Public License along
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20 // with this program; if not, write to the Free Software Foundation, Inc.,
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21 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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22 //-------------------------------------------------------------------------
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23 //
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24
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25 package com.glavsoft.rfb.protocol.state;
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26
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27 import com.glavsoft.exceptions.TransportException;
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28 import com.glavsoft.exceptions.UnsupportedProtocolVersionException;
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29 import com.glavsoft.exceptions.UnsupportedSecurityTypeException;
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30 import com.glavsoft.rfb.CapabilityContainer;
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31 import com.glavsoft.rfb.protocol.ProtocolContext;
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32 import com.glavsoft.rfb.protocol.auth.AuthHandler;
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33 import com.glavsoft.rfb.protocol.auth.SecurityType;
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34 import com.glavsoft.utils.Strings;
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35
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36 import java.util.logging.Logger;
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37
0
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38 public class SecurityTypeState extends ProtocolState {
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39
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40 public SecurityTypeState(ProtocolContext context) {
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41 super(context);
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42 }
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43
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44 @Override
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45 public boolean next() throws UnsupportedProtocolVersionException, TransportException, UnsupportedSecurityTypeException {
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46 negotiateAboutSecurityType();
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47 return true;
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48 }
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49
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50 protected void negotiateAboutSecurityType() throws TransportException,
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51 UnsupportedSecurityTypeException {
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52 int secTypesNum = reader.readUInt8();
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53 if (0 == secTypesNum)
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54 // throw exception with reason
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55 throw new UnsupportedSecurityTypeException(reader.readString());
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56 byte[] secTypes = reader.readBytes(secTypesNum);
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57 Logger.getLogger(getClass().getName()).info("Security Types received (" + secTypesNum + "): "
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58 + Strings.toString(secTypes));
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59 AuthHandler typeSelected = selectAuthHandler(
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60 secTypes, context.getSettings().authCapabilities);
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61 setUseSecurityResult(typeSelected);
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62 writer.writeByte(typeSelected.getId());
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63 Logger.getLogger(getClass().getName()).info("Security Type accepted: " + typeSelected.getName());
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64
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65 changeStateTo(new AuthenticationState(context, typeSelected));
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66 }
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67
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68 /**
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69 * Select apropriate security type we supporded from types which server sent
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70 *
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71 * @param secTypes - byte array with security types server supported
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72 * @param authCapabilities
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73 * @return {@link AuthHandler} of selected type
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74 * @throws UnsupportedSecurityTypeException when no security types server sent we support
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75 */
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76 public static AuthHandler selectAuthHandler(byte[] secTypes, CapabilityContainer authCapabilities)
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77 throws UnsupportedSecurityTypeException {
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78 AuthHandler typeSelected = null;
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79 // Tigh Authentication first
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80 for (byte type : secTypes) {
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81 if (SecurityType.TIGHT_AUTHENTICATION.getId() == (0xff & type)) {
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82 typeSelected = SecurityType.implementedSecurityTypes
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83 .get(SecurityType.TIGHT_AUTHENTICATION.getId());
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84 if (typeSelected != null)
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85 return typeSelected;
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86 }
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87 }
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88 for (byte type : secTypes) {
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89 typeSelected = SecurityType.implementedSecurityTypes.get(0xff & type);
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90 if (typeSelected != null &&
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91 authCapabilities.isSupported(typeSelected.getId()))
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92 return typeSelected;
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93 }
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94 throw new UnsupportedSecurityTypeException(
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95 "No security types supported. Server sent '"
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96 + Strings.toString(secTypes)
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97 + "' security types, but we do not support any of their.");
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98 }
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99
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100 /**
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101 * @param typeSelected
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102 */
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103 protected void setUseSecurityResult(AuthHandler typeSelected) {
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104 // nop for Protocol version 3.8 and above
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105 }
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106
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107 }