在Java中還原SSL X509TrustManager

Question

我有以下代碼，這些代碼有條件地（基於boolean ）禁用SSL證書檢查。

但是，如果我將boolean設置為false並重新運行代碼，則SSL檢查似乎仍處於禁用狀態（應重新啟用）。

那么，與此相反的邏輯是什么，以便恢復檢查？

if (bIgnoreSSL) {
  TrustManager[] trustAllCertificates = new TrustManager[] {
    new X509TrustManager()
    {
      @Override
      public X509Certificate[] getAcceptedIssuers() { return null; // Not relevant.}

      @Override
      public void checkClientTrusted(X509Certificate[] certs, String authType) { // Do nothing. Just allow them all. }

      @Override
      public void checkServerTrusted(X509Certificate[] certs, String authType){ // Do nothing. Just allow them all.}
    }
  };

   HostnameVerifier trustAllHostnames = new HostnameVerifier()
   {
        @Override
        public boolean verify(String hostname, SSLSession session) { return true; // Just allow them all. }
   };

        try
        {
            System.setProperty("jsse.enableSNIExtension", "false");
            SSLContext sc = SSLContext.getInstance("SSL");
            sc.init(null, trustAllCertificates, new SecureRandom());
            HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
            HttpsURLConnection.setDefaultHostnameVerifier(trustAllHostnames);
        }
        catch (GeneralSecurityException e)
        {
            throw new ExceptionInInitializerError(e);
        }
}
else {
  // Code to restore here (Opposite of above?)
}

Answer 1

一種選擇是先將默認值保存在變量中，以便以后可以將其還原：

// save defaults (do this before setting another defaults)
HostnameVerifier defaultVerifier = HttpsURLConnection.getDefaultHostnameVerifier();
SSLSocketFactory defaultFactory = HttpsURLConnection.getDefaultSSLSocketFactory();

if (bIgnoreSSL) {
...
} else {
    // restore defaults
    HttpsURLConnection.setDefaultHostnameVerifier(defaultVerifier);
    HttpsURLConnection.setDefaultSSLSocketFactory(defaultFactory);
}

另一種替代方法（更好的方法是IMO）是不為所有連接設置默認值，而是為每個單獨的連接設置：

HttpsURLConnection conn = // create connection

if (bIgnoreSSL) {
    // set custom verifier and factory only for this connection
    conn.setHostnameVerifier(trustAllHostnames);
    conn.setSSLSocketFactory(sc.getSocketFactory());
}
// no need to restore (else), as I didn't change the defaults

這僅更改指定連接器的驗證程序和工廠，而不會影響默認設置（因此無需還原）。