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任务：使用自签名证书的 FTP4J FTP 连接到 CentOS 机器。

我能够使用 FTP 通过 FTP 成功连接到 CentOS 机器

org.apache.commons.net.ftp.FTPSClient

但是我收到以下错误，我知道它来自使用 FTP4J 的自签名证书。

javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

SO上的一个相关问题问了一个类似的问题，只是针对泽西岛的客户。那里的答案（在下面清理，因为接受的答案会产生编译器错误）不起作用。

这是具有信任所有证书代码的 FTP4J 代码，它不起作用。

import java.io.IOException;
import java.security.SecureRandom;
import java.security.cert.X509Certificate;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import it.sauronsoftware.ftp4j.FTPClient;
import it.sauronsoftware.ftp4j.FTPDataTransferListener;
import it.sauronsoftware.ftp4j.FTPException;
import it.sauronsoftware.ftp4j.FTPIllegalReplyException;

FTPClient ftpsClient = new FTPClient();
try
{
    // Initialize the transfer information.
    this.oFtpArgs.oFtp.transferCount = this.oFtpArgs.pathFiles.size();
    this.oFtpArgs.oFtp.transferCompleted = 0;
    this.oFtpArgs.oFtp.filePercentComplete = 0L;
    this.oFtpArgs.oFtp.bytesTransferredTotal = 0L;

    // Connect to the server using active mode enabling FTP over explicit TLS/SSL (FTPES).
    ftpsClient.setSecurity(FTPClient.SECURITY_FTPES);
    ftpsClient.setPassive(false);
    ftpsClient.connect(this.oFtpArgs.serverIp, port);

    TrustManager[] trustAllCerts = new TrustManager[]{new X509TrustManager()
    {
        @Override
        public X509Certificate[] getAcceptedIssuers(){return null;}
        @Override
        public void checkClientTrusted(X509Certificate[] certs, String authType){}
        @Override
        public void checkServerTrusted(X509Certificate[] certs, String authType){}
    }};

    // Install the all-trusting trust manager
    SSLContext sc = SSLContext.getInstance("TLS");
    sc.init(null, trustAllCerts, new SecureRandom());
    HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());

    // Log into the server.
    ftpsClient.login(user, pass);
}

catch (IOException ex)
{
    System.out.println("Error: " + ex.getMessage());
    ex.printStackTrace();
}

catch (Exception ex)
{
    System.out.println("Error: " + ex.getMessage());
    ex.printStackTrace();
}

Apache FTPSClient 代码完美连接，只是在上传时遇到问题，因此现在是 FTP4J 代码。

import java.io.IOException;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClientConfig;
import org.apache.commons.net.ftp.FTPReply;
import org.apache.commons.net.ftp.FTPSClient;

FTPSClient ftpsClient = new FTPSClient("TLS", false);
try
{
    FTPClientConfig ftpClientConfig = new FTPClientConfig(FTPClientConfig.SYST_UNIX);
    ftpsClient.configure(ftpClientConfig);
    ftpsClient.connect(this.oFtpArgs.serverIp, port);
    int ftpReplyCode = ftpsClient.getReplyCode();
    if (!FTPReply.isPositiveCompletion(ftpReplyCode))
        return;

    // Set protection buffer size
    ftpsClient.execPBSZ(0);

    // Set data channel protection to private
    ftpsClient.execPROT("P");

    // Log into the server.
    ftpsClient.login(user, pass);
    ftpReplyCode = ftpsClient.getReplyCode();
    if (!FTPReply.isPositiveCompletion(ftpReplyCode))
        return;

    // Enter local active mode .
    ftpsClient.enterLocalActiveMode();
}

catch (IOException ex)
{
    System.out.println("Error: " + ex.getMessage());
    ex.printStackTrace();
}

我确实仔细阅读了其他问题，但找不到有用的东西。关于如何告诉 FTP4J 忽略自签名证书上的错误有什么想法吗？

4

1 回答 1

1

你是如此接近。首先，摆脱对HttpsURLConnection. 与 FTP 或 FTPS 完全无关。

但是保留TrustManagerand的SSLContext东西，只需做一点小改动......指导你FTPClient使用结果SSLSocketFactory。

所以你的最终结果看起来像这样：

TrustManager[] trustAllCerts = new TrustManager[]{new X509TrustManager()
{
    @Override
    public X509Certificate[] getAcceptedIssuers(){return null;}
    @Override
    public void checkClientTrusted(X509Certificate[] certs, String authType){}
    @Override
    public void checkServerTrusted(X509Certificate[] certs, String authType){}
}};

// Install the all-trusting trust manager
SSLContext sc = SSLContext.getInstance("TLS");
sc.init(null, trustAllCerts, new SecureRandom());
ftpsClient.setSSLSocketFactory(sc.getSocketFactory());

我的来源？FTP4J 手册。（我确实注意到该示例使用“SSL”而不是“TLS”；您可能必须尝试两种方式。）

于 2016-01-05T16:42:01.407 回答