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1 /* |
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2 * Copyright (c) 2002, 2015, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package sun.security.ssl; |
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27 |
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28 import java.util.*; |
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29 |
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30 /** |
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31 * A list of ProtocolVersions. Also maintains the list of supported protocols. |
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32 * Instances of this class are immutable. Some member variables are final |
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33 * and can be accessed directly without method accessors. |
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34 * |
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35 * @author Andreas Sterbenz |
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36 * @since 1.4.1 |
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37 */ |
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38 final class ProtocolList { |
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39 |
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40 // the sorted protocol version list |
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41 private final ArrayList<ProtocolVersion> protocols; |
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42 |
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43 private String[] protocolNames; |
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44 |
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45 // the minimum and maximum ProtocolVersions in this list |
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46 final ProtocolVersion min, max; |
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47 |
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48 // the format for the hello version to use |
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49 final ProtocolVersion helloVersion; |
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50 |
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51 ProtocolList(String[] names) { |
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52 this(convert(names)); |
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53 } |
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54 |
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55 ProtocolList(ArrayList<ProtocolVersion> versions) { |
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56 this.protocols = versions; |
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57 |
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58 if ((protocols.size() == 1) && |
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59 protocols.contains(ProtocolVersion.SSL20Hello)) { |
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60 throw new IllegalArgumentException("SSLv2Hello cannot be " + |
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61 "enabled unless at least one other supported version " + |
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62 "is also enabled."); |
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63 } |
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64 |
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65 if (protocols.size() != 0) { |
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66 Collections.sort(protocols); |
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67 min = protocols.get(0); |
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68 max = protocols.get(protocols.size() - 1); |
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69 helloVersion = protocols.get(0); |
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70 } else { |
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71 min = ProtocolVersion.NONE; |
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72 max = ProtocolVersion.NONE; |
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73 helloVersion = ProtocolVersion.NONE; |
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74 } |
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75 } |
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76 |
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77 private static ArrayList<ProtocolVersion> convert(String[] names) { |
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78 if (names == null) { |
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79 throw new IllegalArgumentException("Protocols may not be null"); |
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80 } |
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81 |
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82 ArrayList<ProtocolVersion> versions = new ArrayList<>(names.length); |
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83 for (int i = 0; i < names.length; i++ ) { |
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84 ProtocolVersion version = ProtocolVersion.valueOf(names[i]); |
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85 if (versions.contains(version) == false) { |
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86 versions.add(version); |
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87 } |
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88 } |
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89 |
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90 return versions; |
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91 } |
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92 |
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93 /** |
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94 * Return whether this list contains the specified protocol version. |
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95 * SSLv2Hello is not a real protocol version we support, we always |
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96 * return false for it. |
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97 */ |
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98 boolean contains(ProtocolVersion protocolVersion) { |
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99 if (protocolVersion == ProtocolVersion.SSL20Hello) { |
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100 return false; |
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101 } |
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102 return protocols.contains(protocolVersion); |
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103 } |
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104 |
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105 /** |
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106 * Return a reference to the internal Collection of CipherSuites. |
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107 * The Collection MUST NOT be modified. |
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108 */ |
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109 Collection<ProtocolVersion> collection() { |
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110 return protocols; |
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111 } |
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112 |
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113 /** |
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114 * Select a protocol version from the list. |
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115 * |
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116 * Return the lower of the protocol version of that suggested by |
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117 * the <code>protocolVersion</code> and the highest version of this |
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118 * protocol list, or null if no protocol version is available. |
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119 * |
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120 * The method is used by TLS server to negotiated the protocol |
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121 * version between client suggested protocol version in the |
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122 * client hello and protocol versions supported by the server. |
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123 */ |
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124 ProtocolVersion selectProtocolVersion(ProtocolVersion protocolVersion) { |
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125 ProtocolVersion selectedVersion = null; |
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126 for (ProtocolVersion pv : protocols) { |
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127 if (pv.compareTo(protocolVersion) > 0) { |
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128 break; // Safe to break here as this.protocols is sorted, |
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129 // and DTLS and SSL/TLS protocols are not mixed. |
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130 } |
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131 selectedVersion = pv; |
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132 } |
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133 |
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134 return selectedVersion; |
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135 } |
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136 |
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137 /** |
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138 * Return an array with the names of the ProtocolVersions in this list. |
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139 */ |
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140 synchronized String[] toStringArray() { |
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141 if (protocolNames == null) { |
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142 protocolNames = new String[protocols.size()]; |
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143 int i = 0; |
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144 for (ProtocolVersion version : protocols) { |
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145 protocolNames[i++] = version.name; |
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146 } |
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147 } |
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148 return protocolNames.clone(); |
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149 } |
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150 |
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151 @Override |
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152 public String toString() { |
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153 return protocols.toString(); |
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154 } |
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155 } |