使用Java 1.4.2在jsch-0.1.42中“验证失败”

时间：2012-07-10 09:51:18

标签： java jsch

我有这个简单的Java程序，它使用Jsch连接到SFTP服务器。

连接失败，Java 1.4.2上出现“Auth fail”异常，但它在Java 1.7上完美连接。

try {
    JSch jsch = new JSch();

    jsch.setKnownHosts(KNOWN_HOSTS_PATH);
    jsch.addIdentity(PRIVATE_KEY_PATH, PASSPHRASE);

    Session session = jsch.getSession(USERNAME, HOSTNAME, 22);
    session.connect(2500);

    Channel channel = session.openChannel("shell");
    channel.setInputStream(System. in );
    channel.setOutputStream(System.out);
    channel.connect();
} catch (Exception e) {
    e.printStackTrace(System.err);
}

我使用的密钥是ssh-rsa 4096位密钥。 .pub密钥文件与私钥存在于同一目录中。

连接记录器时，我会在异常之前看到以下消息（发生在channel.connect();上）：

INFO: Connecting to <redacted> port 22
INFO: Connection established
INFO: Remote version string: SSH-2.0-OpenSSH_5.1p1 Debian-5
INFO: Local version string: SSH-2.0-JSCH-0.1.42
INFO: CheckCiphers: aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes192-cbc,aes128-cbc,3des-ctr,arcfour,arcfour128,arcfour256
INFO: arcfour is not available.
INFO: arcfour128 is not available.
INFO: arcfour256 is not available.
INFO: SSH_MSG_KEXINIT sent
INFO: SSH_MSG_KEXINIT received
INFO: kex: server->client aes128-ctr hmac-md5 none
INFO: kex: client->server aes128-ctr hmac-md5 none
INFO: SSH_MSG_KEXDH_INIT sent
INFO: expecting SSH_MSG_KEXDH_REPLY
INFO: ssh_rsa_verify: signature true
INFO: Host '<redacted>' is known and mathces the RSA host key
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: password
INFO: Next authentication method: password
INFO: Disconnecting from <redacted> port 22
com.jcraft.jsch.JSchException: Auth fail
        at com.jcraft.jsch.Session.connect(Session.java:452)
        at TestJsch.main(TestJsch.java:19)

当我使用Java 1.7运行相同的程序时，它说

INFO: Connecting to <redacted> port 22
INFO: Connection established
INFO: Remote version string: SSH-2.0-OpenSSH_5.1p1 Debian-5
INFO: Local version string: SSH-2.0-JSCH-0.1.42
INFO: CheckCiphers: aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes192-cbc,aes128-cbc,3des-ctr,arcfour,arcfour128,arcfour256
INFO: SSH_MSG_KEXINIT sent
INFO: SSH_MSG_KEXINIT received
INFO: kex: server->client aes128-ctr hmac-md5 none
INFO: kex: client->server aes128-ctr hmac-md5 none
INFO: SSH_MSG_KEXDH_INIT sent
INFO: expecting SSH_MSG_KEXDH_REPLY
INFO: ssh_rsa_verify: signature true
INFO: Host '<redacted>' is known and mathces the RSA host key
INFO: SSH_MSG_NEWKEYS sent
INFO: SSH_MSG_NEWKEYS received
INFO: SSH_MSG_SERVICE_REQUEST sent
INFO: SSH_MSG_SERVICE_ACCEPT receivedINFO: Authentications that can continue: publickey,keyboard-interactive,password
INFO: Next authentication method: publickey
INFO: Authentication succeeded (publickey).
Linux <redacted> 2.6.26-2-amd64 #1 SMP Mon Jun 13 16:29:33 UTC 2011 x86_64

<server welcome message follows>

我已经为1.4 VM安装了Java Cryptography Extensions（JCE）。

可能是这个问题的根源是什么？

5 个答案:

答案 0 :(得分：4)

Java在使用强加密算法方面存在局限性。检查$JRE_HOME/lib/security/US_Export_policy.jar和$JRE_HOME/lib/security/local_policy.jar的内容。如果你发现这样的话：

// File: default_local.policy
// Some countries have import limits on crypto strength.
// This policy file is worldwide importable.
grant {
    permission javax.crypto.CryptoPermission "DES", 64;
    permission javax.crypto.CryptoPermission "DESede", *;
    permission javax.crypto.CryptoPermission "RC2", 128,
                   "javax.crypto.spec.RC2ParameterSpec", 128;
    permission javax.crypto.CryptoPermission "RC4", 128;
    permission javax.crypto.CryptoPermission "RC5", 128,
          "javax.crypto.spec.RC5ParameterSpec", *, 12, *;
    permission javax.crypto.CryptoPermission "RSA", 2048;
    permission javax.crypto.CryptoPermission *, 128;
};

决定下载并安装JCE Unlimited Strength Jurisdiction Policy。以前，它位于Sun的网站上，现在我不知道它在哪里可以找到。

您可以阅读更多in this article

编辑： 经过一番研究，我发现答案是错误的。

Java 1.4不支持超过2048字节长度BUG 4524097

的RSA密钥

答案 1 :(得分：3)

我对jsch的问题一直是权限问题。所以我会做以下事情来消除它们作为问题

  1. 确保您可以使用命令行在命令行上ssh到遥控器 生成的密钥。
  2. 传入密码并确保您可以连接到遥控器。
  3. 在本地和远程good ssh summary上检查目录的权限。
  4. 尝试将本地主机用作远程主机。

    5. 无法下载源代码并在调试会话中逐步执行。

答案 2 :(得分：1)

您是否尝试过使用Open SSH密钥？ jsch使用Open SSH密钥格式。您可以将现有的转换为Open SSH格式。具体方法如下：使用putty keygen并加载现有密钥。系统可能会提示您输入密码进行解密。之后，单击上面的转换选项，然后选择“导出OpenSSH密钥”。在上面的程序中使用这个新生成的密钥。希望这会有所帮助。

答案 3 :(得分：-2)

此代码正常运行...... 

public class Exec2 {

static String SSH_SERVER_PATH = "localhost";
static String SSH_SERVER_USERNAME = "root";
static String SSH_SERVER_PASSWORD = "root";

public static void main(String[] arg) {
    try {
        JSch jsch = new JSch();
        String host = SSH_SERVER_PATH;
        String user = SSH_SERVER_USERNAME;

        Session session = jsch.getSession(user, host, 22);

        // username and password will be given via UserInfo interface.

        UserInfo ui = new MyUserInfo();
        session.setUserInfo(ui);
        session.connect();

        String command = "uname";

        Channel channel = session.openChannel("exec");
        ((ChannelExec) channel).setCommand(command);

        channel.setInputStream(null);

        ((ChannelExec) channel).setErrStream(System.err);

        InputStream in = channel.getInputStream();

        channel.connect();

        byte[] tmp = new byte[1024];
        while (true) {
            while (in.available() > 0) {
                int i = in.read(tmp, 0, 1024);
                if (i < 0)
                    break;
                System.out.print(new String(tmp, 0, i));
            }
            if (channel.isClosed()) {
                System.out.println("exit-status: " + channel.getExitStatus());
                break;
            }
            try {
                Thread.sleep(1000);
            } catch (Exception ee) {
            }
        }
        channel.disconnect();
        session.disconnect();
    } catch (Exception e) {
        System.out.println(e);
    }
}

public static class MyUserInfo implements UserInfo, UIKeyboardInteractive {

    String passwd;

    public String getPassword() {
        return passwd;
    }

    public boolean promptYesNo(String str) {
        return true;
    }


    public String getPassphrase() {
        return null;
    }

    public boolean promptPassphrase(String message) {
        return true;
    }

    public boolean promptPassword(String message) {
        passwd = SSH_SERVER_PASSWORD;
        return true;
    }

    public void showMessage(String message) {
        System.out.println("message = " + message);
    }

    public String[] promptKeyboardInteractive(String destination,
            String name, String instruction, String[] prompt, boolean[] echo) {
        if (prompt[0].equals("Password: ")){
            String[] response = new String[1];
            response[0] = SSH_SERVER_PASSWORD;
            return response;
        }
        return null;
    }
}
}

答案 4 :(得分：-3)

  

public String getPassphrase（）{           return null;       } 

public boolean promptPassphrase(String message) {
    return true;
}

public boolean promptPassword(String message) {
    passwd = SSH_SERVER_PASSWORD;
    return true;
}

public void showMessage(String message) {
    System.out.println("message = " + message);
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