使用 MATLAB 的 urlread 命令处理无效的安全证书 [英] Handling an invalid security certificate using MATLAB's urlread command

问题描述

我正在使用 MATLAB 的 urlread 命令，一切正常，直到服务被移动到安全服务器(即使用 HTTPS 地址而不是 HTTP 地址).现在 urlread 不再成功检索结果.它给出了一个错误:

I'm accessing an internal database using MATLAB's urlread command, everything was working fine until the service was moved to a secure server (i.e. with an HTTPS address rather than an HTTP address). Now urlread no longer successfully retrieves results. It gives an error:

下载网址出错.您的网络连接可能已关闭或您的代理设置配置不正确.

Error downloading URL. Your network connection may be down or your proxy settings improperly configured.

我认为问题在于该服务使用了无效的数字证书，因为如果我尝试直接在 Web 浏览器中访问该资源，我会收到不受信任的连接"警告，我可以通过将网站添加到例外列表.urlread 没有明显的方法来处理这个问题.

I believe the problem is that the service is using an invalid digital certificate since if I try to access the resource directly in a web browser I get "untrusted connection" warning which I am able to pass through by adding the site to an Exception list. urlread doesn't have an obvious way of handling this problem.

urlread 是在使用 Java 访问 Web 资源，并在这一行抛出错误:

Under the hood urlread is using Java to access web resources, and the error is thrown at this line:

inputStream = urlConnection.getInputStream;

其中 urlConnection 是一个 Java 对象:sun.net.www.protocol.https.HttpsURLConnectionImpl.

where urlConnection is a Java object: sun.net.www.protocol.https.HttpsURLConnectionImpl.

有人建议解决此问题的方法吗?

Anyone suggest a workaround for this problem?

推荐答案

考虑下面的 Java 类.我将此页面用作参考:

Consider the following Java class. I used this page as reference:

在 HTTPS 连接中禁用证书验证p>

C:MATLABMyJavaClassescomstackoverflowDownloader.java

package com.stackoverflow;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.security.cert.X509Certificate;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import javax.net.ssl.HostnameVerifier;

public class Downloader {
    public static String getData(String address) throws Exception {
        // Create a trust manager that does not validate certificate chains
        TrustManager[] trustAllCerts = new TrustManager[] {
            new X509TrustManager() {
                public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                    return null;
                }
                public void checkClientTrusted(X509Certificate[] certs, String authType) {
                }
                public void checkServerTrusted(X509Certificate[] certs, String authType) {
                }
            }
        };

        // Create a host name verifier that always passes
        HostnameVerifier allHostsValid = new HostnameVerifier() {
            public boolean verify(String hostname, SSLSession session) {
                return true;
            }
        };

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

        // Install the all-trusting host verifier
        HttpsURLConnection.setDefaultHostnameVerifier(allHostsValid);

        // open connection
        URL page = new URL(address);
        HttpURLConnection conn = (HttpURLConnection) page.openConnection();
        BufferedReader buff = new BufferedReader(new InputStreamReader(conn.getInputStream()));

        // read text
        String line;
        StringBuffer text = new StringBuffer();
        while ( (line = buff.readLine()) != null ) {
            //System.out.println(line);
            text.append(line + "
");
        }
        buff.close();

        return text.toString();
    }

    public static void main(String[] argv) throws Exception {
        String str = getData("https://expired.badssl.com/");
        System.out.println(str);
    }
}

MATLAB

首先我们编译Java类(我们必须使用与MATLAB兼容的JDK版本):

MATLAB

First we compile the Java class (we must use a JDK version compatible with MATLAB):

>> version -java
>> system('javac C:MATLABMyJavaClassescomstackoverflowDownloader.java');

接下来我们在 MATLAB 中实例化并使用它:

Next we instantiate and use it MATLAB as:

javaaddpath('C:MATLABMyJavaClasses')
dl = com.stackoverflow.Downloader;
str = char(dl.getData('https://expired.badssl.com/'));
web(['text://' str], '-new')

这里有一些带有错误 SSL 证书的 URL 需要测试:

Here are a few URLs with bad SSL certificates to test:

urls = {
    'https://expired.badssl.com/'       % expired
    'https://wrong.host.badssl.com/'    % wrong host
    'https://self-signed.badssl.com/'   % self-signed
    'https://revoked.grc.com/'          % revoked
};

<小时>

更新:我应该提一下，从 R2014b 开始，MATLAB 有一个新功能 webread 取代 urlread.

---

UPDATE: I should mention that starting with R2014b, MATLAB has a new function webread that supersedes urlread.

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