“no matching host key type found” - Apache MINA SFTP server

Question

I’m hoping to set up a SFTP server in Java using Apache MINA.

It seems to start OK, but when I try to connect to it with an OpenSSH client, I get:

$ ssh          


        

Answer 1

This works for me:

Change Maven pom.xml to remove "sshd-sftp", which is now part of "sshd-core":

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

Add to "startSftpServer":

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

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

... there seems to be a lot of guesswork involved in using this library, which seems shady for a "security" lib.