/*

 * Copyright (c) 2010, 2015, 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

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 */

package sun.security.ssl;

import java.security.AlgorithmConstraints;

import java.security.CryptoPrimitive;

import java.security.AlgorithmParameters;

import javax.net.ssl.*;

import java.security.Key;

import java.util.Set;

import sun.security.util.DisabledAlgorithmConstraints;

import static sun.security.util.DisabledAlgorithmConstraints.*;

import sun.security.ssl.CipherSuite.*;

/**

 * Algorithm constraints for disabled algorithms property

 *

 * See the "jdk.certpath.disabledAlgorithms" specification in java.security

 * for the syntax of the disabled algorithm string.

 */

final class SSLAlgorithmConstraints implements AlgorithmConstraints {

            new DisabledAlgorithmConstraints(PROPERTY_TLS_DISABLED_ALGS,

                    new SSLAlgorithmDecomposer());

            new DisabledAlgorithmConstraints(PROPERTY_CERTPATH_DISABLED_ALGS,

                    new SSLAlgorithmDecomposer(true));

    private AlgorithmConstraints userAlgConstraints = null;

    private AlgorithmConstraints peerAlgConstraints = null;

    private boolean enabledX509DisabledAlgConstraints = true;

    // the default algorithm constraints

                        new SSLAlgorithmConstraints(null);

    // the default SSL only algorithm constraints

                        new SSLAlgorithmConstraints((SSLSocket)null, false);

    SSLAlgorithmConstraints(AlgorithmConstraints algorithmConstraints) {

        userAlgConstraints = algorithmConstraints;

    }

    SSLAlgorithmConstraints(SSLSocket socket,

            boolean withDefaultCertPathConstraints) {

        if (socket != null) {

            userAlgConstraints =

                socket.getSSLParameters().getAlgorithmConstraints();

        }

        if (!withDefaultCertPathConstraints) {

            enabledX509DisabledAlgConstraints = false;

        }

    }

    SSLAlgorithmConstraints(SSLEngine engine,

            boolean withDefaultCertPathConstraints) {

        if (engine != null) {

            userAlgConstraints =

                engine.getSSLParameters().getAlgorithmConstraints();

        }

        if (!withDefaultCertPathConstraints) {

            enabledX509DisabledAlgConstraints = false;

        }

    }

    SSLAlgorithmConstraints(SSLSocket socket, String[] supportedAlgorithms,

            boolean withDefaultCertPathConstraints) {

        if (socket != null) {

            userAlgConstraints =

                socket.getSSLParameters().getAlgorithmConstraints();

            peerAlgConstraints =

                new SupportedSignatureAlgorithmConstraints(supportedAlgorithms);

        }

        if (!withDefaultCertPathConstraints) {

            enabledX509DisabledAlgConstraints = false;

        }

    }

    SSLAlgorithmConstraints(SSLEngine engine, String[] supportedAlgorithms,

            boolean withDefaultCertPathConstraints) {

        if (engine != null) {

            userAlgConstraints =

                engine.getSSLParameters().getAlgorithmConstraints();

            peerAlgConstraints =

                new SupportedSignatureAlgorithmConstraints(supportedAlgorithms);

        }

        if (!withDefaultCertPathConstraints) {

            enabledX509DisabledAlgConstraints = false;

        }

    }

    @Override

    public boolean permits(Set<CryptoPrimitive> primitives,

            String algorithm, AlgorithmParameters parameters) {

        boolean permitted = true;

        if (peerAlgConstraints != null) {

            permitted = peerAlgConstraints.permits(

                                    primitives, algorithm, parameters);

        }

        if (permitted && userAlgConstraints != null) {

            permitted = userAlgConstraints.permits(

                                    primitives, algorithm, parameters);

        }

        if (permitted) {

            permitted = tlsDisabledAlgConstraints.permits(

                                    primitives, algorithm, parameters);

        }

        if (permitted && enabledX509DisabledAlgConstraints) {

            permitted = x509DisabledAlgConstraints.permits(

                                    primitives, algorithm, parameters);

        }

        return permitted;

    }

    @Override

    public boolean permits(Set<CryptoPrimitive> primitives, Key key) {

        boolean permitted = true;

        if (peerAlgConstraints != null) {

            permitted = peerAlgConstraints.permits(primitives, key);

        }

        if (permitted && userAlgConstraints != null) {

            permitted = userAlgConstraints.permits(primitives, key);

        }

        if (permitted) {

            permitted = tlsDisabledAlgConstraints.permits(primitives, key);

        }

        if (permitted && enabledX509DisabledAlgConstraints) {

            permitted = x509DisabledAlgConstraints.permits(primitives, key);

        }

        return permitted;

    }

    @Override

    public boolean permits(Set<CryptoPrimitive> primitives,

            String algorithm, Key key, AlgorithmParameters parameters) {

        boolean permitted = true;

        if (peerAlgConstraints != null) {

            permitted = peerAlgConstraints.permits(

                                    primitives, algorithm, key, parameters);

        }

        if (permitted && userAlgConstraints != null) {

            permitted = userAlgConstraints.permits(

                                    primitives, algorithm, key, parameters);

        }

        if (permitted) {

            permitted = tlsDisabledAlgConstraints.permits(

                                    primitives, algorithm, key, parameters);

        }

        if (permitted && enabledX509DisabledAlgConstraints) {

            permitted = x509DisabledAlgConstraints.permits(

                                    primitives, algorithm, key, parameters);

        }

        return permitted;

    }

                                    implements AlgorithmConstraints {

        // supported signature algorithms

        private String[] supportedAlgorithms;

        SupportedSignatureAlgorithmConstraints(String[] supportedAlgorithms) {

            if (supportedAlgorithms != null) {

                this.supportedAlgorithms = supportedAlgorithms.clone();

            } else {

                this.supportedAlgorithms = null;

            }

        }

        @Override

        public boolean permits(Set<CryptoPrimitive> primitives,

                String algorithm, AlgorithmParameters parameters) {

            if (algorithm == null || algorithm.length() == 0) {

                throw new IllegalArgumentException(

                        "No algorithm name specified");

            }

            if (primitives == null || primitives.isEmpty()) {

                throw new IllegalArgumentException(

                        "No cryptographic primitive specified");

            }

            if (supportedAlgorithms == null ||

                        supportedAlgorithms.length == 0) {

                return false;

            }

            // trim the MGF part: <digest>with<encryption>and<mgf>

            int position = algorithm.indexOf("and");

            if (position > 0) {

                algorithm = algorithm.substring(0, position);

            }

            for (String supportedAlgorithm : supportedAlgorithms) {

                if (algorithm.equalsIgnoreCase(supportedAlgorithm)) {

                    return true;

                }

            }

            return false;

        }

        @Override

            return true;

        }

        @Override

                String algorithm, Key key, AlgorithmParameters parameters) {

            if (algorithm == null || algorithm.length() == 0) {

                throw new IllegalArgumentException(

                        "No algorithm name specified");

            }

            return permits(primitives, algorithm, parameters);

        }

    }

}