我实现了一个 Java 程序，它将使用 JSCH 连接到远程服务器并执行命令。问题是每当我尝试连接到服务器时，都会出现以下异常:

com.jcraft.jsch.JSchException: Session.connect: java.security.InvalidAlgorithmParameterException: Prime size must be multiple of 64, and can only range from 256 to 2048 (inclusive)

我尝试了在 jre/lib 和 security.provider 中添加 Bouncy CaSTLe 提供程序的解决方案，它有效。但是我需要让它依赖于项目，所以我尝试在我的构建路径中添加 Bouncy CaSTLe 并在我的程序中手动添加 Bouncy CaSTLe 提供程序。但是导出到jar后，还是报异常。

package services;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.security.Security;
import java.util.Iterator;
import java.util.Properties;

import org.bouncycastle.jce.provider.BouncyCastleProvider;

public class MainService {

public MainService() {
    Security.addProvider(new BouncyCastleProvider()); //Adding BouncyCastlePRovider in security
    // TODO Auto-generated constructor stub
    String report = "";
    StringBuilder sb = new StringBuilder();

    System.out.println("Running the monitoring...");
    System.out.println("Starting printer monitoring...");

    PrinterService ps = new PrinterService(); //A service that connects to the server and executes the commands
    System.out.println("Building report for printer");

    sb.append(ps.buildReport());

    System.out.println("Done building report for printer");
    System.out.println("Finish printer Monitoring...");
    report = sb.toString();
    writeToFile(report,"fai");
}

public static void main(String[] args) {
    // TODO Auto-generated method stub
    MainService msrv = new MainService();
}

public void writeToFile(String contents,String report_name){
    try {
        System.out.println("Writing to file...");
        PrintWriter pw = new PrintWriter(new BufferedWriter(new FileWriter(report_name+".html",false)));
        pw.println(contents);
        pw.close();
        System.out.println("Done writing...");
    } catch (IOException e) {
        e.printStackTrace();
    }
}
}

这是我处理服务器连接的服务器实用程序:

package utilities;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Properties;

import javax.swing.JOptionPane;

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

import entity.Server;

public class ServerUtil {

public ServerUtil() {
    // TODO Auto-generated constructor stub
}

public static Session createSession(Server srv){
    JSch js = new JSch();
    try {
        Session s = js.getSession(srv.getUser().getUsername(), srv.getAddress(), 22);
        s.setPassword(srv.getUser().getPassword());
        Properties config = new Properties();
        config.put("StrictHostKeyChecking", "no");
        config.put("PreferredAuthentications", "password");
        s.setConfig(config);
        s.connect();
        return s;
    } catch (JSchException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        return null;
    }
}

public static ArrayList<String> executeCommands(Session s, String commands){
    ArrayList<String> result = new ArrayList<String>();
    try {
        System.out.println("Creating channel...");
        ChannelExec channel = (ChannelExec) s.openChannel("exec");
        System.out.println("Channel created.");
        System.out.println("Setting commands...");
        channel.setCommand(commands);
        System.out.println("Commands set.");
        System.out.println("Connecting to channel...");
        channel.connect();
        System.out.println("Channel connected.");

        System.out.println("Retrieving output...");
        BufferedReader reader = new BufferedReader(new InputStreamReader(channel.getInputStream()));
        String line;
        while((line = reader.readLine()) != null){
                result.add(line);
        }
        System.out.println("Output retrieved.");
        channel.disconnect();
        System.out.println("Returning result...");
        return result;
    } catch (JSchException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        return result;
    }catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        return result;
    }
}
}

在调试时，我发现错误发生在打印机服务尝试连接到服务器时。

    package services;

import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.Iterator;
import java.util.StringTokenizer;

import com.jcraft.jsch.Session;

import entity.Server;
import utilities.DatabaseUtil;
import utilities.ServerUtil;

public class PrinterService {

    private ArrayList<String> server_names;
    private ArrayList<ArrayList<String>> result_server;

    public PrinterService() {
        // TODO Auto-generated constructor stub
        executePrinterMonitoring();
    }

    //Connect to the printer server and process printer monitoring
    public void executePrinterMonitoring(){
        Iterator<Server> it_s = DatabaseUtil.getServers("PRINTER").iterator();
        server_names = new ArrayList<String>();
        result_server = new ArrayList<ArrayList<String>>();
        while(it_s.hasNext()){
            Server svr = it_s.next();
            System.out.println("***********START PRINTER SERVER***********");
            String commands = "lpstat -t | sed '/READY/d'; lpstat -W | sed '/READY/d'";
            Session connect = ServerUtil.createSession(svr);
            StringTokenizer tokenize = new StringTokenizer(commands, ";");
            ArrayList<String> res;
            ArrayList<ArrayList<String>> res2 = new ArrayList<ArrayList<String>>();
            System.out.println("Executing commands...");
            while(tokenize.hasMoreTokens()){
                String comm = tokenize.nextToken().trim();
                res = ServerUtil.executeCommands(connect, comm);
                res2.add(res);
            }
            System.out.println("Done executing commands...");
            System.out.println("Processing results...");
            processPMonitoring(res2,svr.getName());
            connect.disconnect();
            System.out.println("***********END PRINTER SERVER***********");
        }
   }

    //Get the current date, date - 1, and date - 2
    public String getDate(Calendar cal){
        String mon;
        String dy;
        String dy2;
        String dy3;
        String yr;
        int month = cal.get(Calendar.MONTH)+1;
        int day = cal.get(Calendar.DATE);
        int year = cal.get(Calendar.YEAR);
        if(month < 10)
             mon = "0"+month;
        else
             mon = ""+month;
        if(day < 10){
            dy = "0"+day;
        }
        else{
            dy = ""+day;
        }
        yr = (year+"").substring(2, 4);
        String date =  mon+ "/"+dy+"/"+yr;

        return date;
    }

    //Split and process the result from the server.
public void processPMonitoring(ArrayList<ArrayList<String>> s,String servername){

        Iterator<String> res1 = s.get(0).iterator();
        Iterator<String> res2 = s.get(1).iterator();
        ArrayList<String> as = new ArrayList<String>();
        ArrayList<String> fres = new ArrayList<String>();

        Calendar cal = Calendar.getInstance();
        String date1 = getDate(cal);
        cal.add(Calendar.DATE, -1);
        String date2 = getDate(cal);
        cal.add(Calendar.DATE, -1);
        String date3 = getDate(cal);
        int header = 1;

        System.out.println("Checking server:"+servername);
        System.out.println("Getting queued results...");
        while(res1.hasNext()){
            if(header <= 3){
                //as.add(res1.next());
                header++;
            }
            else{
                String curr = res1.next();
                if(curr.contains("@")){
                    if(curr.contains("STDIN")){
                        String f4 = "";
                        String f5 = "";
                        if(res1.hasNext())
                            f4 = res1.next();
                        if(res1.hasNext())
                            f5 = res1.next();

                        if(f4.contains(date1)){
                            as.add(curr);
                        }
                        else if(f4.contains(date2)){
                            as.add(curr);
                        }
                        else if(f4.contains(date3)){
                            as.add(curr);
                        }
                    }
                }
                else{
                    String f1 = curr;
                    String f2 = "";
                    String f3 = "";
                    if(res1.hasNext())
                        f2 = res1.next();
                    if(res1.hasNext())
                        f3 = res1.next();
                    if(f2.contains(date1)){
                        as.add(f1);
                    }
                    else if(f2.contains(date2)){
                        as.add(f1);
                    }
                    else if(f2.contains(date3)){
                        as.add(f1 + " - 3 DAYS OLD!");
                    }
                }
            }
        }

        System.out.println("Done queued results...");
        Iterator<String> g = as.iterator();
        boolean flag = true;
        String cl = "";
        String std = "";
        header = 1;
        System.out.println("Processing queued results...");
        while(res2.hasNext() && g.hasNext()){
            if(header <=2){
                fres.add(res2.next());
                header++;
            }
            else{
                String curr = res2.next();
                if(curr.contains("@")){
                        fres.add(curr);
                        continue;
                }
                if(flag){
                    cl = g.next();
                    if(cl.contains("@") && cl.contains("STDIN")){
                        continue;
                    }
                    int first_st = cl.indexOf("STDIN");
                    int last_ind = 0;
                    for(last_ind = first_st+1;;last_ind++){
                        //System.out.println("Value of CL:"+cl);
                        //System.out.println("Checking for spaces");
                        //System.out.println("STD CURRENT CHAR:"+cl.charAt(last_ind));
                        if(cl.charAt(last_ind) == ' '){
                            break;
                        }
                    }
                    std = cl.substring(first_st, last_ind);

                    flag = false;

                    if(fres.get(fres.size()-1).contains(std)){
                        flag = true;
                        continue;
                    }

                }
                if(curr.contains(std)){
                    fres.add(curr);
                    flag = true;
                }
            }
        }

        System.out.println("Done processing queued results...");
        System.out.println("Post-process queued results...");
        int size = fres.size();
        boolean down = false;
        for(int i=0;i<size;i++){
            if(fres.get(i).contains("@") && fres.get(i).contains("DOWN")){
                down = true;
                fres.remove(i);
                i--;
                size--;
                continue;
            }
            if(down){
                if(fres.get(i).contains("@") && !fres.get(i).contains("DOWN")){
                    down = false;
                    continue;
                }
                fres.remove(i);
                i--;
                size--;
            }
        }
        System.out.println("Done post-processing queued results...");
        //Post-process
        server_names.add(servername);
        result_server.add(fres);
        //fres.add(0,servername);
        //writeToFile(fres,3);
    }

    public String buildReport(){
        String report = "";
        StringBuilder sb = new StringBuilder();
        Timestamp ts = new Timestamp(new Date().getTime());
        sb.append("<table style=\"border:1px solid black; text-align:center;\" rules=\"all\">");
        sb.append("<h1 style=\"margin:0px 0px 0px 50px\">Printer Monitoring as of "+ts.toString()+"</h1>");
        sb.append("<tr style=\"background-color: seagreen\">"
                + "<th style=\"padding: 6px\">SERVER</th>"
                + "<th style=\"padding: 6px\">QUEUE</th>"
                + "<th style=\"padding: 6px\">DEV</th>"
                + "<th style=\"padding: 6px\">STATUS</th>"
                + "<th style=\"padding: 6px\">JOB FILES</th>"
                + "<th style=\"padding: 6px\">USER</th>"
                + "<th style=\"padding: 6px\">PP</th>"
                + "<th style=\"padding: 6px\">%</th>"
                + "<th style=\"padding: 6px\">BLKS</th>"
                + "<th style=\"padding: 6px\">CP</th>"
                + "<th style=\"padding: 6px\">RNK</th>"
                + "</tr>");
        int counter = 0;
        Iterator<String> it_s = server_names.iterator();
        while(it_s.hasNext()){
            sb.append("<tr style=\"background-color: green\"><td style=\"padding: 6px\"><b>"+it_s.next().toUpperCase()+"</b></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr>");
            Iterator<String> it_res = result_server.get(counter).iterator();
            if(result_server.get(counter).isEmpty()){
                sb.append("<tr><td></td><td style=\"padding: 6px\"><h5>CLEAN</h5></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr>");
            }
            else if(result_server.get(counter).size() == 2){
                sb.append("<tr><td></td><td style=\"padding: 6px\"><h5>CLEAN</h5></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr>");
            }
            else{
                while(it_res.hasNext()){
                    String res = it_res.next();
                    if(!res.contains("Dev") && !res.contains("----")){
                        StringTokenizer tok = new StringTokenizer(res," ");
                        sb.append("<tr>");

                        if(tok.countTokens() == 11){
                            sb.append("<td style=\"padding: 6px\"></td>");
                            for(int x=0;x<10;x++){
                                if(x == 3){
                                    sb.append("<td style=\"padding: 6px\">"+tok.nextToken()+" "+tok.nextToken()+"</td>");
                                }
                                else{
                                    sb.append("<td style=\"padding: 6px\">"+tok.nextToken()+"</td>");
                                }
                            }
                        }
                        else{
                            sb.append("<td style=\"padding: 6px\"></td>");
                            sb.append("<td style=\"padding: 6px\"></td>");
                            sb.append("<td style=\"padding: 6px\"></td>");
                            sb.append("<td style=\"padding: 6px\">"+tok.nextToken()+"</td>");
                            sb.append("<td style=\"padding: 6px\">"+tok.nextToken()+" "+tok.nextToken()+"</td>");
                            sb.append("<td style=\"padding: 6px\">"+tok.nextToken()+"</td>");
                            sb.append("<td style=\"padding: 6px\"></td>");
                            sb.append("<td style=\"padding: 6px\"></td>");
                            sb.append("<td style=\"padding: 6px\">"+tok.nextToken()+"</td>");
                            sb.append("<td style=\"padding: 6px\">"+tok.nextToken()+"</td>");
                            sb.append("<td style=\"padding: 6px\">"+tok.nextToken()+"</td>");
                        }
                        sb.append("</tr>");
                    }
                }
            }
            counter++;
        }
        sb.append("</table>");
        sb.append("</br></br>");
        report = sb.toString();
        return report;
    }
}

我还想知道是否有办法让 Bouncy CaSTLe 更轻，因为我需要我的 jar < 2mb="" 因为我需要将它传输到服务器，而且我没有权限传输大于="" 2mb="">

谢谢你的帮助。这是我在 stackoverflow 中的第一篇文章，我真的很喜欢这个社区。谢谢。

最佳答案

我没有切换到 Ganymed 的好处，所以我安装了“Bouncy CaSTLe”库来替换 JVM 上的安全性。出于某种原因，Java 8 JVM 仍然不允许安全 key 的长度超过 1024。

1. 从 https://www.bouncycastle.org/latest_releases.html 下载 jar 文件(查找以“bcprov-jdk”开头的 jar 文件)

2. 将jar文件放在$JAVA_HOME/jre/lib/ext下

3. 编辑位于 $JAVA_HOME/jre/lib/security 的 java.security 文件
4. 向下滚动到文件的中间部分，您会发现一个带编号的安全提供商列表(大约 9 或 8 个)。为第二个提供商的行添加评论(使用#)

5. 将注释行替换为:

   security.provider.2=org.bouncycaSTLe.jce.provider.BouncyCaSTLeProvider

6. 重新启动您必须执行的操作，然后重试。

我对为什么我们需要以这种方式破解 JDK 感到困惑。它并没有激发我在工作中提到它的任何人的信心。但由于与安全相关的任何文件(或教育)都很差，我们将其视为“临时”修复。

关于Java:InvalidAlgorithmParameterException 质数大小必须是 64 的倍数，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36298394/