web-dev-qa-db-ja.com

JSchでSSHチャネルを開くと「セッションがダウンしています」エラー

JSchでSSHクライアントを作りました。クライアントは、Apache Mina SSHサーバーで正しく動作しています。しかし、実際の機器でテストすると失敗します。

これはクライアントのコードです：

public boolean openConnection() throws ItsSshException {

   boolean connectSuccess = false;
   Properties config = new Properties();
   config.put("StrictHostKeyChecking", "no");
   jschSSH.setConfig(config);
    try {
     sshSession = jschSSH.getSession(username, hostname, port);
     sshSession.setPassword(password);
     sshSession.connect(connectionTimeout);
     LOGGER.info("Connection timeout : " + connectionTimeout);
     Thread.sleep(1000);
     sshHChannel = sshSession.openChannel("Shell");
     sshHChannel.connect();
     in = sshHChannel.getInputStream();
     out = new PrintStream(sshHChannel.getOutputStream());
     clearInitialSocketState();
     connectSuccess = true;
   } catch (Exception e) {
     LOGGER.error("Error during connecting to Host: " + hostname +
                  ", port: " + port + "!", e);
     throw new ItsSshException("Error during connecting to Host: " + e.getMessage());
   }
   LOGGER.info("connectSuccess : " + connectSuccess);
   return connectSuccess;
}

この時点でコードは失敗しています：

sshHChannel = sshSession.openChannel("Shell");

ホストへの接続中にエラー：127.0.0.1、ポート：22！
com.jcraft.jsch.JSchException：セッションがダウンしています
at com.jcraft.jsch.Session.openChannel（Session.Java:861）

私の質問は、この問題を修正する方法とそれを発生させるために何ができるのですか？

これはJSchログです：

INFO: Connecting to 127.0.0.1 port 22 
INFO: Connection established 
INFO: Remote version string: SSH-2.0-Mocana SSH
INFO: Local version string: SSH-2.0-JSCH-0.1.54
INFO: CheckCiphers: aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes192-cbc,aes128-cbc,3des-ctr,arcfour,arcfour128,arcfour256
INFO: aes256-ctr is not available.
INFO: aes192-ctr is not available.
INFO: aes256-cbc is not available.
INFO: aes192-cbc is not available.
INFO: CheckKexes: diffie-hellman-group14-sha1,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521
INFO: CheckSignatures: ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
INFO: SSH_MSG_KEXINIT sent
INFO: SSH_MSG_KEXINIT received
INFO: kex: server: diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
INFO: kex: server: ssh-dss,ssh-rsa
INFO: kex: server: aes256-cbc,rijndael256-cbc,aes192-cbc,rijndael192-cbc,aes128-cbc,rijndael128-cbc,3des-cbc,arcfour
INFO: kex: server: aes256-cbc,rijndael256-cbc,aes192-cbc,rijndael192-cbc,aes128-cbc,rijndael128-cbc,3des-cbc,arcfour
INFO: kex: server: hmac-sha1,hmac-sha1-96,hmac-md5,hmac-md5-96
INFO: kex: server: hmac-sha1,hmac-sha1-96,hmac-md5,hmac-md5-96
INFO: kex: server: none
INFO: kex: server: none
INFO: kex: server: 
INFO: kex: server: 
INFO: kex: client: diffie-hellman-group1-sha1
INFO: kex: client: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
INFO: kex: client: aes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc
INFO: kex: client: aes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc
INFO: kex: client: hmac-md5,hmac-sha1,hmac-sha2-256,hmac-sha1-96,hmac-md5-96
INFO: kex: client: hmac-md5,hmac-sha1,hmac-sha2-256,hmac-sha1-96,hmac-md5-96
INFO: kex: client: none
INFO: kex: client: none
INFO: kex: client: 
INFO: kex: client: 
INFO: kex: server->client aes128-cbc hmac-md5 none
INFO: kex: client->server aes128-cbc hmac-md5 none
INFO: SSH_MSG_KEXDH_INIT sent
INFO: expecting SSH_MSG_KEXDH_REPLY
INFO: ssh_rsa_verify: signature true
WARN: Permanently added '127.0.0.1' (RSA) to the list of known hosts.
INFO: SSH_MSG_NEWKEYS sent
INFO: SSH_MSG_NEWKEYS received
INFO: SSH_MSG_SERVICE_REQUEST sent
INFO: SSH_MSG_SERVICE_ACCEPT received
INFO: Authentications that can continue: publickey,keyboard-interactive,password
INFO: Next authentication method: publickey
INFO: Authentications that can continue: keyboard-interactive,password
INFO: Next authentication method: keyboard-interactive
INFO: Authentications that can continue: password
INFO: Next authentication method: password
INFO: Authentication succeeded (password).
INFO: Caught an exception, leaving main loop due to End of IO Stream Read
INFO: Disconnecting from 127.0.0.1 port 22
javashellsshjsch
7
xmlParser

使用してみてください：

Properties config = new Properties();
config.put("StrictHostKeyChecking", "no");
config.put("PreferredAuthentications", "password");
jschSSH.setConfig(config);

そしてまたセット

sshSession.connect(connectionTimeout) to 5000 or more.

マーティンが言ったように

remove Thread.sleep(1000);
1
Bambus

これを削除します。

Thread.sleep(1000);

サーバーはおそらくクライアント（JSch）からの要求を待ってタイムアウトし、接続を中止します。

2
Martin Prikryl