java JSCH无效私钥

Question

我正在运行JDK1.7&；使用netbeans 7.2的Windows 7 我已经生成了一个SSH私有&；使用putty keygen的公钥对（SSH2-2048位）。我没有任何私钥密码。 我现在正在尝试使用SFTP连接到一台主机。但当我传递私钥（ppk）以设置标识时，代码返回无效私钥错误。我在WinSCP中使用相同的私钥连接到相同的主机&；它工作得很好。请帮我解决这个错误。 这是我的密码：

JSch jsch = new JSch();

Session session = null;

try {

    jsch.addIdentity("D:\\TEMP\\key.ppk");

    session = jsch.getSession("tiabscp", "ssiw.support.qvalent.com", 22);
    session.setConfig("StrictHostKeyChecking", "no");
    //session.setPassword("");
    session.connect();
    Channel channel = session.openChannel("sftp");
    System.out.println("Getting connected");
    channel.connect();
    System.out.println("connected successfully");
    ChannelSftp sftpChannel = (ChannelSftp) channel;
    sftpChannel.get("remotefile.txt", "localfile.txt");
    sftpChannel.exit();
    session.disconnect();
}catch (JSchException e) {

    e.printStackTrace();

}catch (SftpException e) {

    e.printStackTrace();
}

Answer 1

下面的示例代码可能会对您有所帮助

package ssh.control;

import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;

import android.util.Log;

import com.jcraft.jsch.ChannelExec;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.Session;


public class SSHConnections {
    static String user="";
    static String pass="";
    static String ip="";


    static Session session;

    public static ChannelExec getChannelExec() throws Exception{
        //System.out.println("connected");
        //This class serves as a central configuration point, and as a factory for Session objects configured with these settings.
        JSch jsch = new JSch();
        //A Session represents a connection to a SSH server.
        session = jsch.getSession(user, ip, 22);
        //getSession()   :-  the session to which this channel belongs. 
        session.setPassword(pass);

        // Avoid asking for key confirmation
        //http://docs.oracle.com/javase/1.4.2/docs/api/java/util/Properties.html
        Properties prop = new Properties();
        prop.put("StrictHostKeyChecking", "no");


        //Sets multiple default configuration options at once. 
        session.setConfig(prop);

        session.connect();
        if(session.isConnected()) {
            System.out.println("connected");
        }

        // SSH Channel 
        //Opens a new channel of some type over this connection. 
        ChannelExec channelssh = (ChannelExec) session.openChannel("exec");

        return channelssh;
    }

    public static  String[] executeRemoteCommand(String command) throws Exception {

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ChannelExec channelssh = SSHConnections.getChannelExec();
        channelssh.setOutputStream(baos);

        // Execute command
        channelssh.setCommand(command);//gedit tt
        InputStreamReader isr = new InputStreamReader(channelssh.getInputStream());

        BufferedReader bufred = new BufferedReader(isr);

        channelssh.connect();
        String s = bufred.readLine();

        List<String> lines = new ArrayList<String>();

        int count = 0;
        while( s!=null ) {
            //System.out.println(s);
            lines.add(count,s);
            //      filesandfolders[count]=s;
            //      System.out.println(filesandfolders[count]);
            s = bufred.readLine();  
            count++;
        }

        String filesandfolders[] = new String[count];

        for(int i = 0; i<count;i++) {
            filesandfolders[i] = lines.get(i);
            Log.d("filesandfolders[i]", filesandfolders[i]);
        }
        //for(int j=0;j<filesandfolders.length;j++) {
        //System.out.println(filesandfolders[j]);
        //}
        //System.out.println("lines is "+lines.get(0));
        //int a;
        //while((a = isr.read()) != -1)
        //System.out.print((char)a);
        //channelssh.disconnect();
        //return baos.toString();
        return filesandfolders;
    }

    public static  List<String> executeRemoteCommand1(String command) throws Exception {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ChannelExec channelssh=SSHConnections.getChannelExec();
        channelssh.setOutputStream(baos);

        // Execute command
        channelssh.setCommand(command);//gedit tt
        InputStreamReader isr = new InputStreamReader(channelssh.getInputStream());

        BufferedReader bufred = new BufferedReader(isr);

        channelssh.connect();
        String s = bufred.readLine();

        List<String> lines = new ArrayList<String>();

        int count=0;
        while(s != null) {
            //System.out.println(s);
            lines.add(count, s);
            //      filesandfolders[count] = s;
            //      System.out.println(filesandfolders[count]);
            s = bufred.readLine();  
            count++;
        }

        String filesandfolders[] = new String[count];

        for(int i=0; i<count;i++) {
            filesandfolders[i]=lines.get(i);
        }
        //for(int j=0;j<filesandfolders.length;j++) {
        //System.out.println(filesandfolders[j]);
        //}
        //System.out.println("lines is "+lines.get(0));
        //int a;
        //while((a = isr.read()) != -1)
        //System.out.print((char)a);
        //channelssh.disconnect();
        //return baos.toString();
        return lines;
    }
}

要创建目录，请执行以下操作：

SSHConnections.user = "username";
SSHConnections.ip = "192.168.1.102";
SSHConnections.pass = "mypassword";
ChannelExec channelssh = SSHConnections.getChannelExec();

String dirname = "sampledirectory";
try {
    String[] str = SSHConnections.executeRemoteCommand("mkdir "+dirname);
} catch (Exception e) {
    e.printStackTrace();
}

Answer 2

也许不是你的解决方案，但我在寻找我的问题时发现了这个问题

当JSCH需要私钥文件时，我意外地给出了公钥文件的路径

Answer 3

我在使用JSch使用ppk到ssh时遇到了同样的问题。这可能对某人有用

当使用Putty的ppk文件时，它曾经工作过。但是在JSch中使用相同的方法，它会抛出这个异常

我尝试了几种解决方案。最后，我只是将ppk文件加载到PuTTYgen并保存私钥，该私钥生成了外观类似的（在文本编辑器中）文件，但效果不错

1. 按“加载”并选择ppk文件
2. 输入密码短语
3. 单击加载选项下方的“保存私钥”按钮并保存私钥

Answer 4

我猜您的密钥不是OpenSSH密钥文件格式。JSch希望私钥采用OpenSSH格式

您可以使用PuTTYgen转换私钥以使用OpenSSH，方法是执行here中描述的步骤：

1. 按Load并选择使用创建的私钥 普蒂根
2. 输入密码短语以加载密钥
3. 从转换中 菜单选择导出OpenSSH密钥
4. 保存私钥

Answer 5

您可以使用PEMWriter将私钥转换为JSch将接受的PEM格式

下面的示例转换从Java密钥库（JKS）返回的密钥

Key privateKey = KeyStore.getKey(privateKeyAlias, keyStorePassword);//get key from JKS
StringWriter stringWriter = new StringWriter();
PEMWriter pemWriter = new PEMWriter(stringWriter);
pemWriter.writeObject(privateKey);
pemWriter.close();

byte[] privateKeyPEM = stringWriter.toString().getBytes();