Generate an RSA and a DSA keypair and chmod 600 the pem files

James Moger

2014-03-20 c910bee1c4a6c7b4f0a0595ce59759fc0c67c32b

Generate an RSA and a DSA keypair and chmod 600 the pem files

 src/main/java/com/gitblit/transport/ssh/SshDaemon.java

@@ -16,8 +16,12 @@
package com.gitblit.transport.ssh;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.net.InetSocketAddress;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.text.MessageFormat;
import java.util.concurrent.atomic.AtomicBoolean;

@@ -25,7 +29,9 @@
import org.apache.sshd.common.io.IoServiceFactoryFactory;
import org.apache.sshd.common.io.mina.MinaServiceFactoryFactory;
import org.apache.sshd.common.io.nio2.Nio2ServiceFactoryFactory;
import org.apache.sshd.server.keyprovider.PEMGeneratorHostKeyProvider;
import org.apache.sshd.common.keyprovider.FileKeyPairProvider;
import org.apache.sshd.common.util.SecurityUtils;
import org.bouncycastle.openssl.PEMWriter;
import org.eclipse.jgit.internal.JGitText;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@@ -36,7 +42,9 @@
import com.gitblit.manager.IGitblit;
import com.gitblit.transport.ssh.commands.SshCommandFactory;
import com.gitblit.utils.IdGenerator;
import com.gitblit.utils.JnaUtils;
import com.gitblit.utils.StringUtils;
import com.google.common.io.Files;

/**
 * Manager for the ssh transport. Roughly analogous to the
@@ -61,8 +69,6 @@
     */
    public static final int DEFAULT_PORT = 22;

    private static final String HOST_KEY_STORE = "sshKeyStore.pem";

    private final AtomicBoolean run;

    private final IGitblit gitblit;
@@ -77,10 +83,23 @@
        this.gitblit = gitblit;

        IStoredSettings settings = gitblit.getSettings();
        int port = settings.getInteger(Keys.git.sshPort, 0);
        String bindInterface = settings.getString(Keys.git.sshBindInterface,
                "localhost");

        // Ensure that Bouncy Castle is our JCE provider
        SecurityUtils.setRegisterBouncyCastle(true);

        // Generate host RSA and DSA keypairs and create the host keypair provider
        File rsaKeyStore = new File(gitblit.getBaseFolder(), "ssh-rsa-hostkey.pem");
        File dsaKeyStore = new File(gitblit.getBaseFolder(), "ssh-dsa-hostkey.pem");
        generateKeyPair(rsaKeyStore, "RSA", 2048);
        generateKeyPair(dsaKeyStore, "DSA", 0);
        FileKeyPairProvider hostKeyPairProvider = new FileKeyPairProvider();
        hostKeyPairProvider.setFiles(new String [] { rsaKeyStore.getPath(), dsaKeyStore.getPath(), dsaKeyStore.getPath() });

        // Client public key authenticator
        CachingPublicKeyAuthenticator keyAuthenticator =
                new CachingPublicKeyAuthenticator(gitblit.getPublicKeyManager(), gitblit);

        // Configure the preferred SSHD backend
        String sshBackendStr = settings.getString(Keys.git.sshBackend,
                SshSessionBackend.NIO2.name());
        SshSessionBackend backend = SshSessionBackend.valueOf(sshBackendStr);
@@ -89,6 +108,9 @@
                ? MinaServiceFactoryFactory.class.getName()
                : Nio2ServiceFactoryFactory.class.getName());

        // Create the socket address for binding the SSH server
        int port = settings.getInteger(Keys.git.sshPort, 0);
        String bindInterface = settings.getString(Keys.git.sshBindInterface, "");
        InetSocketAddress addr;
        if (StringUtils.isEmpty(bindInterface)) {
            addr = new InetSocketAddress(port);
@@ -96,14 +118,11 @@
            addr = new InetSocketAddress(bindInterface, port);
        }

        File hostKeyStore = new File(gitblit.getBaseFolder(), HOST_KEY_STORE);
        CachingPublicKeyAuthenticator keyAuthenticator =
                new CachingPublicKeyAuthenticator(gitblit.getPublicKeyManager(), gitblit);

        // Create the SSH server
        sshd = SshServer.setUpDefaultServer();
        sshd.setPort(addr.getPort());
        sshd.setHost(addr.getHostName());
        sshd.setKeyPairProvider(new PEMGeneratorHostKeyProvider(hostKeyStore.getPath()));
        sshd.setKeyPairProvider(hostKeyPairProvider);
        sshd.setPublickeyAuthenticator(keyAuthenticator);
        sshd.setPasswordAuthenticator(new UsernamePasswordAuthenticator(gitblit));
        sshd.setSessionFactory(new SshServerSessionFactory());
@@ -112,7 +131,10 @@
        sshd.setCommandFactory(new SshCommandFactory(gitblit, idGenerator));
        sshd.setShellFactory(new WelcomeShell(settings));

        String version = Constants.getGitBlitVersion() + " (" + sshd.getVersion() + ")";
        // Set the server id.  This can be queried with:
        //   ssh-keyscan -t rsa,dsa -p 29418 localhost
        String version = String.format("%s (%s-%s)", Constants.getGitBlitVersion().replace(' ', '_'),
                sshd.getVersion(), sshBackendStr);
        sshd.getProperties().put(SshServer.SERVER_IDENTIFICATION, version);

        run = new AtomicBoolean(false);
@@ -173,4 +195,37 @@
            }
        }
    }

    private void generateKeyPair(File file, String algorithm, int keySize) {
        if (file.exists()) {
            return;
        }
        try {
            KeyPairGenerator generator = SecurityUtils.getKeyPairGenerator(algorithm);
            if (keySize != 0) {
                generator.initialize(keySize);
                log.info("Generating {}-{} SSH host keypair...", algorithm, keySize);
            } else {
                log.info("Generating {} SSH host keypair...", algorithm);
            }
            KeyPair kp = generator.generateKeyPair();

            // create an empty file and set the permissions
            Files.touch(file);
            try {
                JnaUtils.setFilemode(file, JnaUtils.S_IRUSR | JnaUtils.S_IWUSR);
            } catch (UnsupportedOperationException e) {
                // Windows
            }

            FileOutputStream os = new FileOutputStream(file);
            PEMWriter w = new PEMWriter(new OutputStreamWriter(os));
            w.writeObject(kp);
            w.flush();
            w.close();
        } catch (Exception e) {
            log.warn(MessageFormat.format("Unable to generate {0} keypair", algorithm), e);
            return;
        }
    }
}