Xamarin WKWebView 接受自签名证书

我在网上看到过各种例子说明如何接受它们，但我总是得到发生 SSL 错误，无法与服务器建立安全连接。

我要注意的是，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），因此未调用的方法不是这里的问题。

到目前为止我已经尝试过的（显然我只在开发中使用此代码，而不是在生产中使用，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));
    }

我究竟做错了什么？谢谢。

为了支持自签名证书，您have two要做的事情：

1. Allow NSExceptionAllowsInsecureHTTPLoads on your self-signed domain
   • 即使您正在使用https，您的应用被标记为存在信任问题
2. 绕过证书安全检查

2 安全说明：为任何生产应用程序获取 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、您的应用程序的 DNS 重定向欺骗等...您可以通过在主文件中包含公共 cer 来固定证书捆绑并根据收到的证书进行检查，但这仅仅意味着需要在 MITM 或 DNS 欺骗攻击中生成假证书（以及各种漏洞利用工具包中已经存在的工具）

使用示例https://badssl.com site:

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NavigationDelegate or WeakNavigationDelegate您的 WKWebView 实例的。

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>