VerboseHostKeyVerifier.java

package com.sequenceiq.cloudbreak.service.stack.flow;

import java.security.PublicKey;
import java.util.Set;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import net.schmizz.sshj.common.SecurityUtils;
import net.schmizz.sshj.transport.verification.HostKeyVerifier;

public class VerboseHostKeyVerifier implements HostKeyVerifier {

    private static final Logger LOGGER = LoggerFactory.getLogger(VerboseHostKeyVerifier.class);

    private Set<String> expectedFingerprints;

    public VerboseHostKeyVerifier(Set<String> expectedFingerprints) {
        this.expectedFingerprints = expectedFingerprints;
    }

    @Override
    public boolean verify(String hostname, int port, PublicKey key) {
        if (expectedFingerprints.isEmpty()) {
            return true;
        }
        String receivedFingerprint = SecurityUtils.getFingerprint(key);
        boolean matches = false;
        for (String expectedFingerprint : expectedFingerprints) {
            matches = receivedFingerprint.equals(expectedFingerprint);
            if (matches) {
                break;
            }
        }
        if (matches) {
            LOGGER.info("HostKey has been successfully verified. hostname: {}, port: {}, fingerprint: {}", hostname, port, receivedFingerprint);
        } else {
            LOGGER.error("HostKey verification failed. hostname: {}, port: {}, expectedFingerprint: {}, receivedFingerprint: {}", hostname, port,
                    expectedFingerprints, receivedFingerprint);
        }
        return matches;
    }
}