Xamarin WKWebView接受自签名证书

Question

我在网上看过各种示例如何接受它们但我总是得到发生了SSL错误，无法与服务器建立安全连接。

我会注意到该方法肯定被调用（在iOS 8.4模拟器和iOS 11实际设备上运行），所以这里没有调用方法不是问题。

到目前为止我尝试过（显然我只在开发中使用此代码，而不是在生产中，等等等等）：

1：

public override void DidReceiveAuthenticationChallenge(WKWebView webView, NSUrlAuthenticationChallenge challenge, Action<NSUrlSessionAuthChallengeDisposition, NSUrlCredential> completionHandler) {
 completionHandler(NSUrlSessionAuthChallengeDisposition.UseCredential, new NSUrlCredential(serverTrust));
}

2：

public override void DidReceiveAuthenticationChallenge(WKWebView webView, NSUrlAuthenticationChallenge challenge, Action<NSUrlSessionAuthChallengeDisposition, NSUrlCredential> completionHandler) {
 completionHandler(NSUrlSessionAuthChallengeDisposition.UseCredential, NSUrlCredential.FromTrust(serverTrust));
}

3：

    public override void DidReceiveAuthenticationChallenge(WKWebView webView, NSUrlAuthenticationChallenge challenge, Action<NSUrlSessionAuthChallengeDisposition, NSUrlCredential> completionHandler) {
        SecTrust serverTrust = challenge.ProtectionSpace.ServerSecTrust;
        NSData exceptions = serverTrust.GetExceptions();
        serverTrust.SetExceptions(exceptions);
        exceptions.Dispose();
        completionHandler(NSUrlSessionAuthChallengeDisposition.UseCredential, NSUrlCredential.FromTrust(serverTrust));
    }

4：

    public override void DidReceiveAuthenticationChallenge(WKWebView webView, NSUrlAuthenticationChallenge challenge, Action<NSUrlSessionAuthChallengeDisposition, NSUrlCredential> completionHandler) {
        SecTrust serverTrust = challenge.ProtectionSpace.ServerSecTrust;    //TODO: Get the following working (currently we still receive SSL errors)
        NSData exceptions = serverTrust.GetExceptions();
        serverTrust.SetExceptions(exceptions);
        exceptions.Dispose();

        challenge.Sender.UseCredential(NSUrlCredential.FromTrust(serverTrust), challenge);
        completionHandler(NSUrlSessionAuthChallengeDisposition.UseCredential, NSUrlCredential.FromTrust(serverTrust));
    }

我做错了什么？感谢。

Answer 1

要支持自签名证书，您 要做的事情

1. 在自签名域上允许NSExceptionAllowsInsecureHTTPLoads
   • 即使您使用的是https，您的应用也会被标记为有信任问题
2. 绕过证书安全检查

安全提示2 ：为任何生产应用获取CA颁发的证书，因为这会完全禁用您域上的证书验证，从而允许MITM攻击，应用程序的DNS重定向欺骗等。你可以通过将公共cer包含在主包中并根据收到的证书进行检查来确定证书，但这只是意味着需要在MITM或DNS欺骗攻击中生成伪证书（以及那些已经存在的工具）在各种漏洞利用工具包中）

使用https://badssl.com网站的示例：

WKNavigationDelegate：

public class NavigationDelegate : WKNavigationDelegate
{
    const string host = "self-signed.badssl.com";
    public override void DidReceiveAuthenticationChallenge(WKWebView webView, NSUrlAuthenticationChallenge challenge, Action<NSUrlSessionAuthChallengeDisposition, NSUrlCredential> completionHandler)
    {
        switch (challenge.ProtectionSpace.Host)
        {
            case host:
                using (var cred = NSUrlCredential.FromTrust(challenge.ProtectionSpace.ServerSecTrust))
                {
                    completionHandler.Invoke(NSUrlSessionAuthChallengeDisposition.UseCredential, cred);
                }
                break;
            default:
                completionHandler.Invoke(NSUrlSessionAuthChallengeDisposition.PerformDefaultHandling, null);
                break;
        }
    }
}

注意：将此类的实例分配给WKWebView实例的NavigationDelegate或WeakNavigationDelegate。

Info.plist NSAppTransportSecurity：

<key>NSAppTransportSecurity</key>
<dict>
    <key>NSExceptionDomains</key>
    <dict>
        <key>self-signed.badssl.com</key>
        <dict>
            <key>NSExceptionAllowsInsecureHTTPLoads</key>
            <true/>
        </dict>
    </dict>
</dict>