How to set up server for SFTP only?

[typedrat]

How do I set up the russh::server::Handler so to close the channel of a client that attempts to open a PTY, shell, or exec a command?

impl Handler for SshSession {
    // ...

    async fn pty_request(
        &mut self,
        channel: ChannelId,
        _term: &str,
        _col_width: u32,
        _row_height: u32,
        _pix_width: u32,
        _pix_height: u32,
        _modes: &[(Pty, u32)],
        session: &mut Session,
    ) -> Result<(), Self::Error> {
        session.channel_failure(channel)?;

        Ok(())
    }

    async fn shell_request(
        &mut self,
        channel: ChannelId,
        session: &mut Session,
    ) -> Result<(), Self::Error> {
        session.channel_failure(channel)?;

        Ok(())
    }
}

This results in an early EOF error on the server.

[Eugeny]

Depends on how the client reacts to it. If you're getting an early eof, it might mean that the client closes the connection after seeing a request rejection.

If there's nothing you can do on the client side, you could accept the shell/pty request and then just do nothing.

The client will see it as a shell with no output.