| /* |
| * Copyright (c) 2010, 2012, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.security.util; |
| |
| import java.security.CryptoPrimitive; |
| import java.security.AlgorithmParameters; |
| import java.security.Key; |
| import java.util.Locale; |
| import java.util.Set; |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.HashMap; |
| import java.util.regex.Pattern; |
| import java.util.regex.Matcher; |
| |
| /** |
| * Algorithm constraints for disabled algorithms property |
| * |
| * See the "jdk.certpath.disabledAlgorithms" specification in java.security |
| * for the syntax of the disabled algorithm string. |
| */ |
| public class DisabledAlgorithmConstraints extends AbstractAlgorithmConstraints { |
| |
| // the known security property, jdk.certpath.disabledAlgorithms |
| public final static String PROPERTY_CERTPATH_DISABLED_ALGS = |
| "jdk.certpath.disabledAlgorithms"; |
| |
| // the known security property, jdk.tls.disabledAlgorithms |
| public final static String PROPERTY_TLS_DISABLED_ALGS = |
| "jdk.tls.disabledAlgorithms"; |
| |
| private final static Map<String, String[]> disabledAlgorithmsMap = |
| new HashMap<>(); |
| private final static Map<String, KeySizeConstraints> keySizeConstraintsMap = |
| new HashMap<>(); |
| |
| private final String[] disabledAlgorithms; |
| private final KeySizeConstraints keySizeConstraints; |
| |
| /** |
| * Initialize algorithm constraints with the specified security property. |
| * |
| * @param propertyName the security property name that define the disabled |
| * algorithm constraints |
| */ |
| public DisabledAlgorithmConstraints(String propertyName) { |
| this(propertyName, new AlgorithmDecomposer()); |
| } |
| |
| public DisabledAlgorithmConstraints(String propertyName, |
| AlgorithmDecomposer decomposer) { |
| super(decomposer); |
| disabledAlgorithms = getAlgorithms(disabledAlgorithmsMap, propertyName); |
| keySizeConstraints = getKeySizeConstraints(disabledAlgorithms, |
| propertyName); |
| } |
| |
| @Override |
| final public boolean permits(Set<CryptoPrimitive> primitives, |
| String algorithm, AlgorithmParameters parameters) { |
| if (primitives == null || primitives.isEmpty()) { |
| throw new IllegalArgumentException( |
| "No cryptographic primitive specified"); |
| } |
| |
| return checkAlgorithm(disabledAlgorithms, algorithm, decomposer); |
| } |
| |
| @Override |
| final public boolean permits(Set<CryptoPrimitive> primitives, Key key) { |
| return checkConstraints(primitives, "", key, null); |
| } |
| |
| @Override |
| final public boolean permits(Set<CryptoPrimitive> primitives, |
| String algorithm, Key key, AlgorithmParameters parameters) { |
| |
| if (algorithm == null || algorithm.length() == 0) { |
| throw new IllegalArgumentException("No algorithm name specified"); |
| } |
| |
| return checkConstraints(primitives, algorithm, key, parameters); |
| } |
| |
| // Check algorithm constraints |
| private boolean checkConstraints(Set<CryptoPrimitive> primitives, |
| String algorithm, Key key, AlgorithmParameters parameters) { |
| |
| // check the key parameter, it cannot be null. |
| if (key == null) { |
| throw new IllegalArgumentException("The key cannot be null"); |
| } |
| |
| // check the target algorithm |
| if (algorithm != null && algorithm.length() != 0) { |
| if (!permits(primitives, algorithm, parameters)) { |
| return false; |
| } |
| } |
| |
| // check the key algorithm |
| if (!permits(primitives, key.getAlgorithm(), null)) { |
| return false; |
| } |
| |
| // check the key constraints |
| if (keySizeConstraints.disables(key)) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| private static KeySizeConstraints getKeySizeConstraints( |
| String[] disabledAlgorithms, String propertyName) { |
| synchronized (keySizeConstraintsMap) { |
| if(!keySizeConstraintsMap.containsKey(propertyName)) { |
| // map the key constraints |
| KeySizeConstraints keySizeConstraints = |
| new KeySizeConstraints(disabledAlgorithms); |
| keySizeConstraintsMap.put(propertyName, keySizeConstraints); |
| } |
| |
| return keySizeConstraintsMap.get(propertyName); |
| } |
| } |
| |
| /** |
| * key constraints |
| */ |
| private static class KeySizeConstraints { |
| private static final Pattern pattern = Pattern.compile( |
| "(\\S+)\\s+keySize\\s*(<=|<|==|!=|>|>=)\\s*(\\d+)"); |
| |
| private Map<String, Set<KeySizeConstraint>> constraintsMap = |
| Collections.synchronizedMap( |
| new HashMap<String, Set<KeySizeConstraint>>()); |
| |
| public KeySizeConstraints(String[] restrictions) { |
| for (String restriction : restrictions) { |
| if (restriction == null || restriction.isEmpty()) { |
| continue; |
| } |
| |
| Matcher matcher = pattern.matcher(restriction); |
| if (matcher.matches()) { |
| String algorithm = matcher.group(1); |
| |
| KeySizeConstraint.Operator operator = |
| KeySizeConstraint.Operator.of(matcher.group(2)); |
| int length = Integer.parseInt(matcher.group(3)); |
| |
| algorithm = algorithm.toLowerCase(Locale.ENGLISH); |
| |
| synchronized (constraintsMap) { |
| if (!constraintsMap.containsKey(algorithm)) { |
| constraintsMap.put(algorithm, |
| new HashSet<KeySizeConstraint>()); |
| } |
| |
| Set<KeySizeConstraint> constraintSet = |
| constraintsMap.get(algorithm); |
| KeySizeConstraint constraint = |
| new KeySizeConstraint(operator, length); |
| constraintSet.add(constraint); |
| } |
| } |
| } |
| } |
| |
| // Does this KeySizeConstraints disable the specified key? |
| public boolean disables(Key key) { |
| String algorithm = key.getAlgorithm().toLowerCase(Locale.ENGLISH); |
| synchronized (constraintsMap) { |
| if (constraintsMap.containsKey(algorithm)) { |
| Set<KeySizeConstraint> constraintSet = |
| constraintsMap.get(algorithm); |
| for (KeySizeConstraint constraint : constraintSet) { |
| if (constraint.disables(key)) { |
| return true; |
| } |
| } |
| } |
| } |
| |
| return false; |
| } |
| } |
| |
| /** |
| * Key size constraint. |
| * |
| * e.g. "keysize <= 1024" |
| */ |
| private static class KeySizeConstraint { |
| // operator |
| static enum Operator { |
| EQ, // "==" |
| NE, // "!=" |
| LT, // "<" |
| LE, // "<=" |
| GT, // ">" |
| GE; // ">=" |
| |
| static Operator of(String s) { |
| switch (s) { |
| case "==": |
| return EQ; |
| case "!=": |
| return NE; |
| case "<": |
| return LT; |
| case "<=": |
| return LE; |
| case ">": |
| return GT; |
| case ">=": |
| return GE; |
| } |
| |
| throw new IllegalArgumentException( |
| s + " is not a legal Operator"); |
| } |
| } |
| |
| private int minSize; // the minimal available key size |
| private int maxSize; // the maximal available key size |
| private int prohibitedSize = -1; // unavailable key sizes |
| |
| public KeySizeConstraint(Operator operator, int length) { |
| switch (operator) { |
| case EQ: // an unavailable key size |
| this.minSize = 0; |
| this.maxSize = Integer.MAX_VALUE; |
| prohibitedSize = length; |
| break; |
| case NE: |
| this.minSize = length; |
| this.maxSize = length; |
| break; |
| case LT: |
| this.minSize = length; |
| this.maxSize = Integer.MAX_VALUE; |
| break; |
| case LE: |
| this.minSize = length + 1; |
| this.maxSize = Integer.MAX_VALUE; |
| break; |
| case GT: |
| this.minSize = 0; |
| this.maxSize = length; |
| break; |
| case GE: |
| this.minSize = 0; |
| this.maxSize = length > 1 ? (length - 1) : 0; |
| break; |
| default: |
| // unlikely to happen |
| this.minSize = Integer.MAX_VALUE; |
| this.maxSize = -1; |
| } |
| } |
| |
| // Does this key constraint disable the specified key? |
| public boolean disables(Key key) { |
| int size = KeyUtil.getKeySize(key); |
| |
| if (size == 0) { |
| return true; // we don't allow any key of size 0. |
| } else if (size > 0) { |
| return ((size < minSize) || (size > maxSize) || |
| (prohibitedSize == size)); |
| } // Otherwise, the key size is not accessible. Conservatively, |
| // please don't disable such keys. |
| |
| return false; |
| } |
| } |
| |
| } |
| |