"没有找到匹配的主机密钥类型" - Apache MINA SFTP 服务器

Question

我希望使用Apache MINA在Java中设置SFTP服务器。

看起来它已经成功启动了，但是当我尝试使用OpenSSH客户端连接时，出现以下错误：

$ ssh localhost -p 2222
Unable to negotiate with ::1: no matching host key type found. Their offer: ssh-dss
$ ssh -V
OpenSSH_7.1p1, OpenSSL 1.0.2d 9 Jul 2015

Java应用程序日志：

! java.lang.IllegalStateException: Unable to negotiate key exchange for server host key algorithms (client: [e-mail],[e-mail],[e-mail],[e-mail],[e-mail],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519,ssh-rsa / server: ssh-dss)
! at org.apache.sshd.common.session.AbstractSession.negotiate(AbstractSession.java:1279) ~[sshd-core-1.0.0.jar:1.0.0]

我的Maven依赖如下：

<dependency>
    <groupId>org.apache.sshd</groupId>
    <artifactId>sshd-sftp</artifactId>
    <version>0.11.0</version>
</dependency>

<dependency>
    <groupId>org.apache.sshd</groupId>
    <artifactId>sshd-core</artifactId>
    <version>1.0.0</version>
</dependency>

我的应用程序启动代码如下（从https://dev59.com/FXA75IYBdhLWcg3w1s32#8974515复制）

import org.apache.sshd.common.NamedFactory;
import org.apache.sshd.server.Command;
import org.apache.sshd.server.SshServer;
import org.apache.sshd.server.auth.UserAuth;
import org.apache.sshd.server.auth.UserAuthNoneFactory;
import org.apache.sshd.server.command.ScpCommandFactory;
import org.apache.sshd.server.keyprovider.SimpleGeneratorHostKeyProvider;
import org.apache.sshd.sftp.subsystem.SftpSubsystem;

private void startSftpServer() throws IOException {
    SshServer sshd = SshServer.setUpDefaultServer();
    sshd.setPort(2222);
    sshd.setKeyPairProvider(new SimpleGeneratorHostKeyProvider(
            new File("hostkey.ser")));

    List<NamedFactory<UserAuth>> userAuthFactories = new ArrayList<NamedFactory<UserAuth>>();
    userAuthFactories.add(new UserAuthNoneFactory());
    sshd.setUserAuthFactories(userAuthFactories);

    sshd.setCommandFactory(new ScpCommandFactory());

    List<NamedFactory<Command>> namedFactoryList = new ArrayList<NamedFactory<Command>>();
    namedFactoryList.add(new SftpSubsystem.Factory());
    sshd.setSubsystemFactories(namedFactoryList);

    sshd.start();
}

我该如何向服务器添加更多现代主机密钥算法？

- Rich

Answer 1

这对我有效:

更改Maven pom.xml以删除“sshd-sftp”，该库现在已经包含在“sshd-core”中：

<dependency>
    <groupId>org.apache.sshd</groupId>
    <artifactId>sshd-core</artifactId>
    <version>1.0.0</version>
</dependency>

添加至 "startSftpServer"：

    AbstractGeneratorHostKeyProvider hostKeyProvider =
            new SimpleGeneratorHostKeyProvider(SERVER_KEY_FILE.toPath());

    hostKeyProvider.setAlgorithm("RSA");
    sshd.setKeyPairProvider(hostKeyProvider);

…在使用这个库时似乎涉及很多猜测，这对于一个“安全”库来说似乎有些不可靠。

- Rich

---

谢谢，setAlgorithm(KeyUtils.RSA_ALGORITHM); 正是我在尝试让 SSHD 工作时所缺失的。如果有人遇到“未找到匹配的主机密钥类型。他们的提供：ssh-dss”的问题，请尝试将主机密钥算法设置为 RSA！ - JeroenHoek

还要记得删除之前保存的 SERVER_KEY_FILE！ - Jesse Glick

默认设置的建议更改。 - Jesse Glick

对我来说，Java_161抛出了一个异常：java.security.InvalidKeyException: SHA-1摘要算法的安全强度不足而这些代码解决了问题：AbstractGeneratorHostKeyProvider hostKeyProvider = new SimpleGeneratorHostKeyProvider(Paths.get("keystore")); hostKeyProvider.setAlgorithm(KeyUtils.DSS_ALGORITHM); hostKeyProvider.setKeySize(512); - hipokito