org.apache.sshd.common.keyprovider.FileHostKeyCertificateProvider Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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 org.apache.sshd.common.keyprovider;

import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.security.GeneralSecurityException;
import java.security.InvalidKeyException;
import java.security.PublicKey;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

import org.apache.sshd.common.config.keys.OpenSshCertificate;
import org.apache.sshd.common.config.keys.PublicKeyEntry;
import org.apache.sshd.common.session.SessionContext;
import org.apache.sshd.common.util.GenericUtils;
import org.apache.sshd.common.util.ValidateUtils;
import org.apache.sshd.common.util.logging.AbstractLoggingBean;

public class FileHostKeyCertificateProvider extends AbstractLoggingBean implements HostKeyCertificateProvider {
    private final Collection files;

    public FileHostKeyCertificateProvider(Path path) {
        this((path == null) ? Collections.emptyList() : Collections.singletonList(path));
    }

    public FileHostKeyCertificateProvider(Path... files) {
        this(GenericUtils.isEmpty(files) ? Collections.emptyList() : Arrays.asList(files));
    }

    public FileHostKeyCertificateProvider(Collection files) {
        this.files = ValidateUtils.checkNotNullAndNotEmpty(files, "No paths provided");
    }

    public Collection getPaths() {
        return files;
    }

    @Override
    public Iterable loadCertificates(SessionContext session)
            throws IOException, GeneralSecurityException {
        Collection keyPaths = getPaths();
        List certificates = new ArrayList<>();
        boolean debugEnabled = log.isDebugEnabled();
        for (Path file : keyPaths) {
            if (debugEnabled) {
                log.debug("loadCertificates({}) loading file {}", session, file);
            }

            Collection lines = Files.readAllLines(file, StandardCharsets.UTF_8);
            int lineNumber = 0;
            for (String line : lines) {
                lineNumber++;
                line = GenericUtils.replaceWhitespaceAndTrim(line);
                if (GenericUtils.isEmpty(line) || (line.charAt(0) == '#')) {
                    continue;
                }

                PublicKeyEntry publicKeyEntry = PublicKeyEntry.parsePublicKeyEntry(line);
                if (publicKeyEntry == null) {
                    continue;
                }

                PublicKey publicKey = publicKeyEntry.resolvePublicKey(session, null, null);
                if (publicKey == null) {
                    continue;
                }

                if (!(publicKey instanceof OpenSshCertificate)) {
                    throw new InvalidKeyException("Got unexpected key type in " + file + "; line " + lineNumber
                                                  + ". Expected OpenSSHCertificate.");
                }
                if (!OpenSshCertificate.Type.HOST.equals(((OpenSshCertificate) publicKey).getType())) {
                    throw new InvalidKeyException(
                            "OpenSSHCertificate in " + file + ", line " + lineNumber + ", is not a host certificate.");
                }

                certificates.add((OpenSshCertificate) publicKey);
            }
        }

        return certificates;
    }
}