google.registry.testing.sftp.TestSftpServer.java Source code

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// Copyright 2016 The Nomulus Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package google.registry.testing.sftp;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import java.io.File;
import java.io.IOException;
import java.io.StringReader;
import java.security.KeyPair;
import java.security.PublicKey;
import java.security.Security;
import java.util.Arrays;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.Nullable;
import org.apache.ftpserver.FtpServer;
import org.apache.ftpserver.ftplet.FtpException;
import org.apache.sshd.common.NamedFactory;
import org.apache.sshd.common.file.virtualfs.VirtualFileSystemFactory;
import org.apache.sshd.common.keyprovider.KeyPairProvider;
import org.apache.sshd.common.random.SingletonRandomFactory;
import org.apache.sshd.server.Command;
import org.apache.sshd.server.ServerBuilder;
import org.apache.sshd.server.SshServer;
import org.apache.sshd.server.auth.password.PasswordAuthenticator;
import org.apache.sshd.server.auth.pubkey.PublickeyAuthenticator;
import org.apache.sshd.server.scp.ScpCommandFactory;
import org.apache.sshd.server.session.ServerSession;
import org.apache.sshd.server.subsystem.sftp.SftpSubsystemFactory;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.openssl.PEMKeyPair;
import org.bouncycastle.openssl.PEMParser;
import org.bouncycastle.openssl.jcajce.JcaPEMKeyConverter;

/** In-process SFTP server using Apache SSHD. */
public class TestSftpServer implements FtpServer {

    private static final Logger logger = Logger.getLogger(TestSftpServer.class.getName());

    private static SingletonRandomFactory secureRandomFactory;

    static {
        Security.addProvider(new BouncyCastleProvider());
    }

    private static final String HOST_KEY = "" + "-----BEGIN RSA PRIVATE KEY-----\n"
            + "MIIEowIBAAKCAQEAx7uuoDyMR3c+sIg0fPfBeyoUjPa6hh3yN5S4/HLEOOaXcA2c\n"
            + "uhNm8WwIXF/FwC32CJHZcCC3XhNeQDIpEt5wj9NHr++pjYWjp4Ue+n/2QbDO4LKB\n"
            + "fb67zRbL++BZNswBKYwmzaiHoyWYERj+ZrZpf7hqHnKTAs4NIUCkhUvUHQzgdfT6\n"
            + "vfEYv2HrM2VVVaqpUALrkogZHqQYfLA+InHXXZ3x+GmdSBCxaxUHHZypwETv+yBJ\n"
            + "YAP+9Ofcmu3mpedK/3o3KJ2pD4OXwoXAtbHDOfnJMJylCKcCT3aodpdULSf4A8Zm\n"
            + "o4fxppQCbGUw43D7u18he5qNdLDkgCV8iXewbQIDAQABAoIBAH/Fs9e0BDVvtj3u\n"
            + "VE2hnTeyWsU2zWog3CPsU07ECH0yHqzDOIDdCpzk9JBLgFEJ1fvzebs+Yq+fCktd\n"
            + "C2OTw0Ru78xAMCJl3KS9B21O0PWDK0UZTLdpffCcZc/y3H+ukAvJKcWky2h2E0rU\n"
            + "x2JjzSe0jMZ/m0ZPFJ0yIk1XjhEqWgp3OCP9EHaO82+GM8UTuoBrfOs8gcv6aqiO\n"
            + "L06BU6a6i75chUtZbSadaUnZOE8tIyXit6p63bBHp2oN4D8FiOPBuTDwFEI4zrA4\n"
            + "vNcfRvKQWnQjlWm91BCajNxVqWi7XtWK7ikmwefZWNcd83RSf6vfb8ThpjwHmBaE\n"
            + "dbbL9i0CgYEA+KwB5qiaRxryBI1xqQaH6HiQ5WtW06ft43l2FrTZGPocjyF7KyWn\n"
            + "lS5q0J4tdSSkNfXqhT8aosm3VjfIxoDuQQO0ptD+km5qe1xu/qxLHJYd5FP67X9O\n"
            + "66e8sxcDSuKSvZ6wNeKNOL5SC7dDLCuMZoRTvXxGneg9a1w2x1MVrZsCgYEAzZ56\n"
            + "cqqNvavj4x2yDG+4oAB4/sQvVFK2+PopFpO5w8ezLDVfnoIv56gfmqMN9UdZH8Ew\n"
            + "PJhuEFRcdePo2ZnNjsWf9NhniJSMsEPTIc5qOPyoo5DcQM6DU8f4HC236uR+5P0h\n"
            + "jLfKRpvZl+N3skJi98QQr9PeLyb0sM8zRbZ0fpcCgYA9nuIZtk4EsLioSCSSLfwf\n"
            + "r0C4mRC7AjIA3GhW2Bm0BsZs8W8EEiCk5wuxBoFdNec7N+UVf72p+TJlOw2Vov1n\n"
            + "PvPVIpTy1EmuqAkZMriqLMjbe7QChjmYS8iG2H0IYXzbYCdqMumr1f2eyZrrpx7z\n"
            + "iHb3zYPyPUp7AC7S1dPZYQKBgQCK0p+LQVk3IJFYalkmiltVM1x9bUkjHkFIseUB\n"
            + "yDUYWIDArTxkkTL0rY7A4atv2X7zsIP3tVZCEiLmuTwhhfTBmu3W6jBkhx7Bdtla\n"
            + "LrmKxhK5c/kwi/0gmJcLt1Y/8Ys24SxAjGm16E0tfjb3FFkrPKWjgGC25w83PH06\n"
            + "aOgX+wKBgBLkLh/rwpiD4e8ZVjGuCn9A0H/2KZknXyNbkVjPho0FXBKIlfMa6c34\n"
            + "fRLDvHVZ0xo4dQxp38Wg+ZzIwGoAHhuJpSsfMsWKVXwNwV4iMEt2zyZRomui3TzT\n"
            + "+8awtDyALwvL05EBuxctT3iFGQcUj/fNCi0PeLoTSscdH2pdvHTb\n" + "-----END RSA PRIVATE KEY-----\n";

    private static final String KEY_TYPE = "ssh-rsa";

    private static final KeyPair HOST_KEY_PAIR = createKeyPair(HOST_KEY);

    @Nullable
    private static KeyPair createKeyPair(String key) {
        try (PEMParser pemParser = new PEMParser(new StringReader(key))) {
            PEMKeyPair pemPair = (PEMKeyPair) pemParser.readObject();
            KeyPair result = new JcaPEMKeyConverter().setProvider("BC").getKeyPair(pemPair);
            logger.info("Read key pair " + result);
            return result;
        } catch (IOException e) {
            logger.log(Level.SEVERE, "Couldn't read key pair from string(!)", e);
            return null;
        }
    }

    public static FtpServer createSftpServer(final String authorizedUser, @Nullable final String authorizedPassword,
            @Nullable final PublicKey authorizedPublicKey, int port, final File home) {

        ServerBuilder serverBuilder = ServerBuilder.builder();
        serverBuilder.randomFactory(secureRandomFactory);

        if (authorizedPublicKey != null) {
            // This authenticator checks that the user is presenting the right key. If authenticate
            // returns true, then the server will make sure that the user can prove they have that key.
            // Not that you would know this from the Apache javadocs.
            serverBuilder.publickeyAuthenticator(new PublickeyAuthenticator() {
                @Override
                public boolean authenticate(String username, PublicKey publicKey, ServerSession session) {
                    return Arrays.equals(publicKey.getEncoded(), authorizedPublicKey.getEncoded());
                }
            });
        }

        serverBuilder.fileSystemFactory(new VirtualFileSystemFactory(home.toPath()));

        SshServer server = serverBuilder.build();
        server.setCommandFactory(new ScpCommandFactory());
        server.setPort(port);

        NamedFactory<Command> sftpSubsystemFactory = new SftpSubsystemFactory.Builder().build();
        server.setSubsystemFactories(ImmutableList.of(sftpSubsystemFactory));

        if (authorizedPassword != null) {
            server.setPasswordAuthenticator(new PasswordAuthenticator() {
                @Override
                public boolean authenticate(String username, String password, ServerSession session) {
                    return username.equals(authorizedUser) && password.equals(authorizedPassword);
                }
            });
        }

        KeyPairProvider keyPairProvider = new KeyPairProvider() {
            final ImmutableMap<String, KeyPair> keyPairByTypeMap = ImmutableMap.of(KEY_TYPE, HOST_KEY_PAIR);

            @Override
            public Iterable<KeyPair> loadKeys() {
                return keyPairByTypeMap.values();
            }

            @Override
            public Iterable<String> getKeyTypes() {
                return keyPairByTypeMap.keySet();
            }

            @Override
            public KeyPair loadKey(final String type) {
                return keyPairByTypeMap.get(type);
            }
        };
        server.setKeyPairProvider(keyPairProvider);

        return new TestSftpServer(server);
    }

    private final SshServer server;

    private boolean stopped = true;

    private TestSftpServer(SshServer server) {
        this.server = server;
    }

    @Override
    public void suspend() {
        // NOP
    }

    @Override
    public synchronized void stop() {
        try {
            logger.info("Stopping server");
            server.stop(true);
            stopped = true;
        } catch (IOException e) {
            logger.log(Level.WARNING, "Error shutting down server", e);
        }
    }

    @Override
    public synchronized void start() throws FtpException {
        try {
            logger.info("Starting server");
            server.start();
            stopped = false;
        } catch (IOException e) {
            logger.log(Level.WARNING, "Couldn't start server", e);
            throw new FtpException("Couldn't start server", e);
        }
    }

    @Override
    public void resume() {
        // NOP
    }

    @Override
    public boolean isSuspended() {
        return false;
    }

    @Override
    public boolean isStopped() {
        return stopped;
    }
}