Showing the changes to java/pkg/javax/crypto/JceSecurityManager.java (1 of 18352 files). Show all
Unified · Split
| @@ -0,0 +1,252 @@ | ||
| 1 | +/* | |
| 2 | + * Copyright (c) 1999, 2007, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package javax.crypto; | |
| 27 | + | |
| 28 | +import java.security.*; | |
| 29 | +import java.net.*; | |
| 30 | +import java.util.*; | |
| 31 | +import java.util.jar.*; | |
| 32 | + | |
| 33 | +/** | |
| 34 | + * The JCE security manager. | |
| 35 | + * | |
| 36 | + * <p>The JCE security manager is responsible for determining the maximum | |
| 37 | + * allowable cryptographic strength for a given applet/application, for a given | |
| 38 | + * algorithm, by consulting the configured jurisdiction policy files and | |
| 39 | + * the cryptographic permissions bundled with the applet/application. | |
| 40 | + * | |
| 41 | + * <p>Note that this security manager is never installed, only instantiated. | |
| 42 | + * | |
| 43 | + * @author Jan Luehe | |
| 44 | + * | |
| 45 | + * @since 1.4 | |
| 46 | + */ | |
| 47 | + | |
| 48 | +final class JceSecurityManager extends SecurityManager { | |
| 49 | + | |
| 50 | + private static final CryptoPermissions defaultPolicy; | |
| 51 | + private static final CryptoPermissions exemptPolicy; | |
| 52 | + private static final CryptoAllPermission allPerm; | |
| 53 | + private static final Vector TrustedCallersCache = new Vector(2); | |
| 54 | + private static final Map exemptCache = new HashMap(); | |
| 55 | + | |
| 56 | + // singleton instance | |
| 57 | + static final JceSecurityManager INSTANCE; | |
| 58 | + | |
| 59 | + static { | |
| 60 | + defaultPolicy = JceSecurity.getDefaultPolicy(); | |
| 61 | + exemptPolicy = JceSecurity.getExemptPolicy(); | |
| 62 | + allPerm = CryptoAllPermission.INSTANCE; | |
| 63 | + INSTANCE = (JceSecurityManager) | |
| 64 | + AccessController.doPrivileged(new PrivilegedAction() { | |
| 65 | + public Object run() { | |
| 66 | + return new JceSecurityManager(); | |
| 67 | + } | |
| 68 | + }); | |
| 69 | + } | |
| 70 | + | |
| 71 | + private JceSecurityManager() { | |
| 72 | + // empty | |
| 73 | + } | |
| 74 | + | |
| 75 | + /** | |
| 76 | + * Returns the maximum allowable crypto strength for the given | |
| 77 | + * applet/application, for the given algorithm. | |
| 78 | + */ | |
| 79 | + CryptoPermission getCryptoPermission(String alg) { | |
| 80 | + // Need to convert to uppercase since the crypto perm | |
| 81 | + // lookup is case sensitive. | |
| 82 | + alg = alg.toUpperCase(Locale.ENGLISH); | |
| 83 | + | |
| 84 | + // If CryptoAllPermission is granted by default, we return that. | |
| 85 | + // Otherwise, this will be the permission we return if anything goes | |
| 86 | + // wrong. | |
| 87 | + CryptoPermission defaultPerm = getDefaultPermission(alg); | |
| 88 | + if (defaultPerm == CryptoAllPermission.INSTANCE) { | |
| 89 | + return defaultPerm; | |
| 90 | + } | |
| 91 | + | |
| 92 | + // Determine the codebase of the caller of the JCE API. | |
| 93 | + // This is the codebase of the first class which is not in | |
| 94 | + // javax.crypto.* packages. | |
| 95 | + // NOTE: javax.crypto.* package maybe subject to package | |
| 96 | + // insertion, so need to check its classloader as well. | |
| 97 | + Class[] context = getClassContext(); | |
| 98 | + URL callerCodeBase = null; | |
| 99 | + int i; | |
| 100 | + for (i=0; i<context.length; i++) { | |
| 101 | + Class cls = context[i]; | |
| 102 | + callerCodeBase = JceSecurity.getCodeBase(cls); | |
| 103 | + if (callerCodeBase != null) { | |
| 104 | + break; | |
| 105 | + } else { | |
| 106 | + if (cls.getName().startsWith("javax.crypto.")) { | |
| 107 | + // skip jce classes since they aren't the callers | |
| 108 | + continue; | |
| 109 | + } | |
| 110 | + // use default permission when the caller is system classes | |
| 111 | + return defaultPerm; | |
| 112 | + } | |
| 113 | + } | |
| 114 | + | |
| 115 | + if (i == context.length) { | |
| 116 | + return defaultPerm; | |
| 117 | + } | |
| 118 | + | |
| 119 | + CryptoPermissions appPerms; | |
| 120 | + synchronized (this.getClass()) { | |
| 121 | + if (exemptCache.containsKey(callerCodeBase)) { | |
| 122 | + appPerms = (CryptoPermissions)exemptCache.get(callerCodeBase); | |
| 123 | + } else { | |
| 124 | + appPerms = getAppPermissions(callerCodeBase); | |
| 125 | + exemptCache.put(callerCodeBase, appPerms); | |
| 126 | + } | |
| 127 | + } | |
| 128 | + | |
| 129 | + if (appPerms == null) { | |
| 130 | + return defaultPerm; | |
| 131 | + } | |
| 132 | + | |
| 133 | + // If the app was granted the special CryptoAllPermission, return that. | |
| 134 | + if (appPerms.implies(allPerm)) { | |
| 135 | + return allPerm; | |
| 136 | + } | |
| 137 | + | |
| 138 | + // Check if the crypto permissions granted to the app contain a | |
| 139 | + // crypto permission for the requested algorithm that does not require | |
| 140 | + // any exemption mechanism to be enforced. | |
| 141 | + // Return that permission, if present. | |
| 142 | + PermissionCollection appPc = appPerms.getPermissionCollection(alg); | |
| 143 | + if (appPc == null) { | |
| 144 | + return defaultPerm; | |
| 145 | + } | |
| 146 | + Enumeration enum_ = appPc.elements(); | |
| 147 | + while (enum_.hasMoreElements()) { | |
| 148 | + CryptoPermission cp = (CryptoPermission)enum_.nextElement(); | |
| 149 | + if (cp.getExemptionMechanism() == null) { | |
| 150 | + return cp; | |
| 151 | + } | |
| 152 | + } | |
| 153 | + | |
| 154 | + // Check if the jurisdiction file for exempt applications contains | |
| 155 | + // any entries for the requested algorithm. | |
| 156 | + // If not, return the default permission. | |
| 157 | + PermissionCollection exemptPc = | |
| 158 | + exemptPolicy.getPermissionCollection(alg); | |
| 159 | + if (exemptPc == null) { | |
| 160 | + return defaultPerm; | |
| 161 | + } | |
| 162 | + | |
| 163 | + // In the jurisdiction file for exempt applications, go through the | |
| 164 | + // list of CryptoPermission entries for the requested algorithm, and | |
| 165 | + // stop at the first entry: | |
| 166 | + // - that is implied by the collection of crypto permissions granted | |
| 167 | + // to the app, and | |
| 168 | + // - whose exemption mechanism is available from one of the | |
| 169 | + // registered CSPs | |
| 170 | + enum_ = exemptPc.elements(); | |
| 171 | + while (enum_.hasMoreElements()) { | |
| 172 | + CryptoPermission cp = (CryptoPermission)enum_.nextElement(); | |
| 173 | + try { | |
| 174 | + ExemptionMechanism.getInstance(cp.getExemptionMechanism()); | |
| 175 | + if (cp.getAlgorithm().equals( | |
| 176 | + CryptoPermission.ALG_NAME_WILDCARD)) { | |
| 177 | + CryptoPermission newCp; | |
| 178 | + if (cp.getCheckParam()) { | |
| 179 | + newCp = new CryptoPermission( | |
| 180 | + alg, cp.getMaxKeySize(), | |
| 181 | + cp.getAlgorithmParameterSpec(), | |
| 182 | + cp.getExemptionMechanism()); | |
| 183 | + } else { | |
| 184 | + newCp = new CryptoPermission( | |
| 185 | + alg, cp.getMaxKeySize(), | |
| 186 | + cp.getExemptionMechanism()); | |
| 187 | + } | |
| 188 | + if (appPerms.implies(newCp)) { | |
| 189 | + return newCp; | |
| 190 | + } | |
| 191 | + } | |
| 192 | + | |
| 193 | + if (appPerms.implies(cp)) { | |
| 194 | + return cp; | |
| 195 | + } | |
| 196 | + } catch (Exception e) { | |
| 197 | + continue; | |
| 198 | + } | |
| 199 | + } | |
| 200 | + return defaultPerm; | |
| 201 | + } | |
| 202 | + | |
| 203 | + private static CryptoPermissions getAppPermissions(URL callerCodeBase) { | |
| 204 | + // Check if app is exempt, and retrieve the permissions bundled with it | |
| 205 | + try { | |
| 206 | + return JceSecurity.verifyExemptJar(callerCodeBase); | |
| 207 | + } catch (Exception e) { | |
| 208 | + // Jar verification fails | |
| 209 | + return null; | |
| 210 | + } | |
| 211 | + | |
| 212 | + } | |
| 213 | + | |
| 214 | + /** | |
| 215 | + * Returns the default permission for the given algorithm. | |
| 216 | + */ | |
| 217 | + private CryptoPermission getDefaultPermission(String alg) { | |
| 218 | + Enumeration enum_ = | |
| 219 | + defaultPolicy.getPermissionCollection(alg).elements(); | |
| 220 | + return (CryptoPermission)enum_.nextElement(); | |
| 221 | + } | |
| 222 | + | |
| 223 | + // See bug 4341369 & 4334690 for more info. | |
| 224 | + boolean isCallerTrusted() { | |
| 225 | + // Get the caller and its codebase. | |
| 226 | + Class[] context = getClassContext(); | |
| 227 | + URL callerCodeBase = null; | |
| 228 | + int i; | |
| 229 | + for (i=0; i<context.length; i++) { | |
| 230 | + callerCodeBase = JceSecurity.getCodeBase(context[i]); | |
| 231 | + if (callerCodeBase != null) { | |
| 232 | + break; | |
| 233 | + } | |
| 234 | + } | |
| 235 | + // The caller is in the JCE framework. | |
| 236 | + if (i == context.length) { | |
| 237 | + return true; | |
| 238 | + } | |
| 239 | + //The caller has been verified. | |
| 240 | + if (TrustedCallersCache.contains(context[i])) { | |
| 241 | + return true; | |
| 242 | + } | |
| 243 | + // Check whether the caller is a trusted provider. | |
| 244 | + try { | |
| 245 | + JceSecurity.verifyProviderJar(callerCodeBase); | |
| 246 | + } catch (Exception e2) { | |
| 247 | + return false; | |
| 248 | + } | |
| 249 | + TrustedCallersCache.addElement(context[i]); | |
| 250 | + return true; | |
| 251 | + } | |
| 252 | +} | |