1 /* |
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2 * Copyright (c) 1997, 2016, 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 javax.crypto; |
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27 |
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28 import java.util.*; |
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29 import java.util.jar.*; |
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30 import java.io.*; |
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31 import java.net.URL; |
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32 import java.nio.file.*; |
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33 import java.security.*; |
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34 |
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35 import java.security.Provider.Service; |
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36 |
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37 import sun.security.jca.*; |
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38 import sun.security.jca.GetInstance.Instance; |
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39 |
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40 /** |
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41 * This class instantiates implementations of JCE engine classes from |
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42 * providers registered with the java.security.Security object. |
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43 * |
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44 * @author Jan Luehe |
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45 * @author Sharon Liu |
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46 * @since 1.4 |
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47 */ |
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48 |
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49 final class JceSecurity { |
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50 |
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51 static final SecureRandom RANDOM = new SecureRandom(); |
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52 |
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53 // The defaultPolicy and exemptPolicy will be set up |
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54 // in the static initializer. |
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55 private static CryptoPermissions defaultPolicy = null; |
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56 private static CryptoPermissions exemptPolicy = null; |
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57 |
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58 // Map<Provider,?> of the providers we already have verified |
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59 // value == PROVIDER_VERIFIED is successfully verified |
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60 // value is failure cause Exception in error case |
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61 private static final Map<Provider, Object> verificationResults = |
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62 new IdentityHashMap<>(); |
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63 |
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64 // Map<Provider,?> of the providers currently being verified |
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65 private static final Map<Provider, Object> verifyingProviders = |
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66 new IdentityHashMap<>(); |
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67 |
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68 private static final boolean isRestricted; |
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69 |
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70 /* |
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71 * Don't let anyone instantiate this. |
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72 */ |
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73 private JceSecurity() { |
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74 } |
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75 |
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76 static { |
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77 try { |
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78 AccessController.doPrivileged( |
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79 new PrivilegedExceptionAction<> () { |
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80 @Override |
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81 public Void run() throws Exception { |
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82 setupJurisdictionPolicies(); |
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83 return null; |
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84 } |
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85 } |
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86 ); |
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87 |
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88 isRestricted = defaultPolicy.implies( |
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89 CryptoAllPermission.INSTANCE) ? false : true; |
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90 } catch (Exception e) { |
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91 throw new SecurityException( |
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92 "Can not initialize cryptographic mechanism", e); |
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93 } |
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94 } |
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95 |
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96 static Instance getInstance(String type, Class<?> clazz, String algorithm, |
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97 String provider) throws NoSuchAlgorithmException, |
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98 NoSuchProviderException { |
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99 Service s = GetInstance.getService(type, algorithm, provider); |
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100 Exception ve = getVerificationResult(s.getProvider()); |
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101 if (ve != null) { |
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102 String msg = "JCE cannot authenticate the provider " + provider; |
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103 throw (NoSuchProviderException) |
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104 new NoSuchProviderException(msg).initCause(ve); |
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105 } |
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106 return GetInstance.getInstance(s, clazz); |
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107 } |
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108 |
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109 static Instance getInstance(String type, Class<?> clazz, String algorithm, |
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110 Provider provider) throws NoSuchAlgorithmException { |
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111 Service s = GetInstance.getService(type, algorithm, provider); |
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112 Exception ve = JceSecurity.getVerificationResult(provider); |
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113 if (ve != null) { |
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114 String msg = "JCE cannot authenticate the provider " |
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115 + provider.getName(); |
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116 throw new SecurityException(msg, ve); |
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117 } |
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118 return GetInstance.getInstance(s, clazz); |
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119 } |
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120 |
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121 static Instance getInstance(String type, Class<?> clazz, String algorithm) |
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122 throws NoSuchAlgorithmException { |
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123 List<Service> services = GetInstance.getServices(type, algorithm); |
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124 NoSuchAlgorithmException failure = null; |
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125 for (Service s : services) { |
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126 if (canUseProvider(s.getProvider()) == false) { |
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127 // allow only signed providers |
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128 continue; |
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129 } |
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130 try { |
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131 Instance instance = GetInstance.getInstance(s, clazz); |
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132 return instance; |
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133 } catch (NoSuchAlgorithmException e) { |
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134 failure = e; |
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135 } |
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136 } |
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137 throw new NoSuchAlgorithmException("Algorithm " + algorithm |
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138 + " not available", failure); |
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139 } |
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140 |
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141 /** |
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142 * Verify if the JAR at URL codeBase is a signed exempt application |
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143 * JAR file and returns the permissions bundled with the JAR. |
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144 * |
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145 * @throws Exception on error |
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146 */ |
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147 static CryptoPermissions verifyExemptJar(URL codeBase) throws Exception { |
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148 ProviderVerifier pv = new ProviderVerifier(codeBase, true); |
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149 pv.verify(); |
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150 return pv.getPermissions(); |
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151 } |
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152 |
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153 /** |
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154 * Verify if the JAR at URL codeBase is a signed provider JAR file. |
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155 * |
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156 * @throws Exception on error |
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157 */ |
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158 static void verifyProvider(URL codeBase, Provider p) throws Exception { |
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159 // Verify the provider JAR file and all |
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160 // supporting JAR files if there are any. |
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161 ProviderVerifier pv = new ProviderVerifier(codeBase, p, false); |
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162 pv.verify(); |
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163 } |
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164 |
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165 private static final Object PROVIDER_VERIFIED = Boolean.TRUE; |
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166 |
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167 /* |
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168 * Verify that the provider JAR files are signed properly, which |
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169 * means the signer's certificate can be traced back to a |
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170 * JCE trusted CA. |
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171 * Return null if ok, failure Exception if verification failed. |
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172 */ |
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173 static synchronized Exception getVerificationResult(Provider p) { |
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174 Object o = verificationResults.get(p); |
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175 if (o == PROVIDER_VERIFIED) { |
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176 return null; |
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177 } else if (o != null) { |
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178 return (Exception)o; |
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179 } |
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180 if (verifyingProviders.get(p) != null) { |
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181 // this method is static synchronized, must be recursion |
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182 // return failure now but do not save the result |
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183 return new NoSuchProviderException("Recursion during verification"); |
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184 } |
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185 try { |
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186 verifyingProviders.put(p, Boolean.FALSE); |
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187 URL providerURL = getCodeBase(p.getClass()); |
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188 verifyProvider(providerURL, p); |
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189 // Verified ok, cache result |
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190 verificationResults.put(p, PROVIDER_VERIFIED); |
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191 return null; |
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192 } catch (Exception e) { |
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193 verificationResults.put(p, e); |
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194 return e; |
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195 } finally { |
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196 verifyingProviders.remove(p); |
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197 } |
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198 } |
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199 |
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200 // return whether this provider is properly signed and can be used by JCE |
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201 static boolean canUseProvider(Provider p) { |
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202 return getVerificationResult(p) == null; |
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203 } |
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204 |
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205 // dummy object to represent null |
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206 private static final URL NULL_URL; |
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207 |
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208 static { |
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209 try { |
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210 NULL_URL = new URL("http://null.oracle.com/"); |
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211 } catch (Exception e) { |
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212 throw new RuntimeException(e); |
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213 } |
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214 } |
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215 |
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216 // reference to a Map we use as a cache for codebases |
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217 private static final Map<Class<?>, URL> codeBaseCacheRef = |
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218 new WeakHashMap<>(); |
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219 |
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220 /* |
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221 * Returns the CodeBase for the given class. |
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222 */ |
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223 static URL getCodeBase(final Class<?> clazz) { |
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224 synchronized (codeBaseCacheRef) { |
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225 URL url = codeBaseCacheRef.get(clazz); |
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226 if (url == null) { |
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227 url = AccessController.doPrivileged( |
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228 new PrivilegedAction<>() { |
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229 @Override |
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230 public URL run() { |
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231 ProtectionDomain pd = clazz.getProtectionDomain(); |
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232 if (pd != null) { |
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233 CodeSource cs = pd.getCodeSource(); |
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234 if (cs != null) { |
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235 return cs.getLocation(); |
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236 } |
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237 } |
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238 return NULL_URL; |
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239 } |
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240 }); |
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241 codeBaseCacheRef.put(clazz, url); |
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242 } |
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243 return (url == NULL_URL) ? null : url; |
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244 } |
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245 } |
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246 |
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247 // This is called from within an doPrivileged block. |
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248 private static void setupJurisdictionPolicies() throws Exception { |
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249 |
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250 // Sanity check the crypto.policy Security property. Single |
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251 // directory entry, no pseudo-directories (".", "..", leading/trailing |
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252 // path separators). normalize()/getParent() will help later. |
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253 String cryptoPolicyProperty = Security.getProperty("crypto.policy"); |
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254 Path cpPath = Paths.get(cryptoPolicyProperty); |
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255 |
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256 if ((cryptoPolicyProperty == null) || |
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257 (cpPath.getNameCount() != 1) || |
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258 (cpPath.compareTo(cpPath.getFileName()) != 0)) { |
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259 throw new SecurityException( |
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260 "Invalid policy directory name format: " + |
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261 cryptoPolicyProperty); |
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262 } |
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263 |
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264 // Prepend java.home to get the full path. normalize() in |
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265 // case an extra "." or ".." snuck in somehow. |
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266 String javaHomeProperty = System.getProperty("java.home"); |
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267 Path javaHomePolicyPath = Paths.get(javaHomeProperty, "conf", |
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268 "security", "policy").normalize(); |
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269 Path cryptoPolicyPath = Paths.get(javaHomeProperty, "conf", "security", |
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270 "policy", cryptoPolicyProperty).normalize(); |
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271 |
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272 if (cryptoPolicyPath.getParent().compareTo(javaHomePolicyPath) != 0) { |
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273 throw new SecurityException( |
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274 "Invalid cryptographic jurisdiction policy directory path: " + |
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275 cryptoPolicyProperty); |
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276 } |
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277 |
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278 if (!Files.isDirectory(cryptoPolicyPath) |
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279 || !Files.isReadable(cryptoPolicyPath)) { |
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280 throw new SecurityException( |
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281 "Can't read cryptographic policy directory: " + |
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282 cryptoPolicyProperty); |
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283 } |
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284 |
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285 try (DirectoryStream<Path> stream = Files.newDirectoryStream( |
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286 cryptoPolicyPath, "{default,exempt}_*.policy")) { |
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287 for (Path entry : stream) { |
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288 try (InputStream is = new BufferedInputStream( |
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289 Files.newInputStream(entry))) { |
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290 String filename = entry.getFileName().toString(); |
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291 |
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292 CryptoPermissions tmpPerms = new CryptoPermissions(); |
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293 tmpPerms.load(is); |
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294 |
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295 if (filename.startsWith("default_")) { |
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296 // Did we find a default perms? |
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297 defaultPolicy = ((defaultPolicy == null) ? tmpPerms : |
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298 defaultPolicy.getMinimum(tmpPerms)); |
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299 } else if (filename.startsWith("exempt_")) { |
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300 // Did we find a exempt perms? |
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301 exemptPolicy = ((exemptPolicy == null) ? tmpPerms : |
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302 exemptPolicy.getMinimum(tmpPerms)); |
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303 } else { |
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304 // This should never happen. newDirectoryStream |
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305 // should only throw return "{default,exempt}_*.policy" |
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306 throw new SecurityException( |
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307 "Unexpected jurisdiction policy files in : " + |
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308 cryptoPolicyProperty); |
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309 } |
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310 } catch (Exception e) { |
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311 throw new SecurityException( |
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312 "Couldn't parse jurisdiction policy files in: " + |
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313 cryptoPolicyProperty); |
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314 } |
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315 } |
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316 } catch (DirectoryIteratorException ex) { |
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317 // I/O error encountered during the iteration, |
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318 // the cause is an IOException |
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319 throw new SecurityException( |
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320 "Couldn't iterate through the jurisdiction policy files: " + |
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321 cryptoPolicyProperty); |
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322 } |
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323 |
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324 // Must have a default policy |
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325 if ((defaultPolicy == null) || defaultPolicy.isEmpty()) { |
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326 throw new SecurityException( |
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327 "Missing mandatory jurisdiction policy files: " + |
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328 cryptoPolicyProperty); |
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329 } |
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330 |
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331 // If there was an empty exempt policy file, ignore it. |
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332 if ((exemptPolicy != null) && exemptPolicy.isEmpty()) { |
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333 exemptPolicy = null; |
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334 } |
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335 } |
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336 |
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337 static CryptoPermissions getDefaultPolicy() { |
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338 return defaultPolicy; |
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339 } |
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340 |
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341 static CryptoPermissions getExemptPolicy() { |
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342 return exemptPolicy; |
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343 } |
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344 |
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345 static boolean isRestricted() { |
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346 return isRestricted; |
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347 } |
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348 } |
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