Question

环境：

Outlook 2016
Windows Server 2016
Microsoft Visual Studio Community 2017

问题描述：

我正在开发一个应该针对ADFS服务器进行身份验证的Outlook加载项。

仔细按照此处列出的步骤操作后： https://tech.greenhouse.io/2016/08/01/create-adfs-instance-on-azure-virtual-machine.html

我可以在ADFS用户外部通过ADFS在Internet Explorer和Chrome中成功登录。

但是，当尝试使用相同的方法通过Outlook加载项登录时，我会看到以下内容的页面：

ADFS Login
An error occurred
An error occurred. Contact your administrator for more information.
Error details
© 2016 Microsoft

以下是示例日志文件。

Outlook加载项：

Add-in successfully started up.
User interaction in Outlook ribbon happened.
SAML SP login: https://validsslcertdomain.com/saml2/login/?idp=http://adfsserverinazurecloud.com/adfs/services/trust
SAML IDP Url: https://adfsserverinazurecloud.com/adfs/ls/?SAMLRequest=jZJNTxsxEIbv/RWWLzntejcSKrWyiwJR1AhKo2RBKrfBOymWvPbWYxPCr8ebpBQuUa8z7/vM5+TipTPsGT1pZ6tRmRcjhla5Vtvf1eiumWfno4v6y4SgM72cxvBkV/gnIgWWjJbkkKh49FY6IE3SQockg5Lr6Y8bOc4LCUToQ8LzD5b+tKf3LjjlDGfTv+4rZyl26Nfon7XCu9VNxZ9C6EkKETFrqSizAJAHHcButMFcuU4MtcYCFAnOZqlrbWGA/bO+y6HdUI5AIVKujIst9H0Or9EfQENamAGzmFVct9lr2M7nv+J18RDV9a5vtilDFHFhKRFDxcdF+TUri6w8b8pSFmfy7NsDZ8vjZJfa7nd8cg2PBxHJ702zzJY/1w1n98db8STg9f4wcl/Ys7nzHYTTyCGSut/spRJtmn/H6/9dZIcBWgggJuJD4fr4HreJvZgtndFqx6bGuO2VRwhY8Q0YQv7eIGeiPhA+/1T9Bg==&RelayState=/
SAML WIA Url: https://adfsserverinazurecloud.com/adfs/ls/wia?SAMLRequest=jZJNTxsxEIbv/RWWLzntejcSKrWyiwJR1AhKo2RBKrfBOymWvPbWYxPCr8ebpBQuUa8z7/vM5+TipTPsGT1pZ6tRmRcjhla5Vtvf1eiumWfno4v6y4SgM72cxvBkV/gnIgWWjJbkkKh49FY6IE3SQockg5Lr6Y8bOc4LCUToQ8LzD5b+tKf3LjjlDGfTv+4rZyl26Nfon7XCu9VNxZ9C6EkKETFrqSizAJAHHcButMFcuU4MtcYCFAnOZqlrbWGA/bO+y6HdUI5AIVKujIst9H0Or9EfQENamAGzmFVct9lr2M7nv+J18RDV9a5vtilDFHFhKRFDxcdF+TUri6w8b8pSFmfy7NsDZ8vjZJfa7nd8cg2PBxHJ702zzJY/1w1n98db8STg9f4wcl/Ys7nzHYTTyCGSut/spRJtmn/H6/9dZIcBWgggJuJD4fr4HreJvZgtndFqx6bGuO2VRwhY8Q0YQv7eIGeiPhA+/1T9Bg==&RelayState=/&client-request-id=a1209b03-ffed-419c-4904-0080000000f4

ADFS服务器：

错误ID：364

Encountered error during federation passive request.

Additional Data

Protocol Name:

Relying Party:

Exception details:
System.FormatException: Invalid length for a Base-64 char array or string.
   at System.Convert.FromBase64_Decode(Char* startInputPtr, Int32 inputLength, Byte* startDestPtr, Int32 destLength)
   at System.Convert.FromBase64CharPtr(Char* inputPtr, Int32 inputLength)
   at System.Convert.FromBase64String(String s)
   at Microsoft.IdentityServer.Protocols.Saml.HttpSamlBindingSerializer.DecodeMessageInternal(String message)
   at Microsoft.IdentityServer.Protocols.Saml.HttpSamlBindingSerializer.ReadProtocolMessage(String encodedSamlMessage)
   at Microsoft.IdentityServer.Protocols.Saml.HttpSamlBindingSerializer.CreateFromNameValueCollection(Uri baseUrl, NameValueCollection collection)
   at Microsoft.IdentityServer.Protocols.Saml.HttpRedirectSamlBindingSerializer.ReadMessage(Uri requestUrl, NameValueCollection form)
   at Microsoft.IdentityServer.Web.Protocols.Saml.HttpSamlMessageFactory.CreateMessage(WrappedHttpListenerRequest httpRequest)
   at Microsoft.IdentityServer.Web.Protocols.Saml.SamlContextFactory.CreateProtocolContextFromRequest(WrappedHttpListenerRequest request, ProtocolContext& protocolContext)
   at Microsoft.IdentityServer.Web.Protocols.Saml.SamlProtocolHandler.CreateProtocolContext(WrappedHttpListenerRequest request)
   at Microsoft.IdentityServer.Web.PassiveProtocolListener.GetProtocolHandler(WrappedHttpListenerRequest request, ProtocolContext& protocolContext, PassiveProtocolHandler& protocolHandler)
   at Microsoft.IdentityServer.Web.PassiveProtocolListener.OnGetContext(WrappedHttpListenerContext context)

以下是加载项的示例代码：

// String definitions
string samlAcs = Properties.Settings.Default.samlAcs;
string samlIdp = Properties.Settings.Default.samlIdp;
string serverUrl = Properties.Settings.Default.serverUrl;
string loginUrl = serverUrl + "/saml2/login/?idp=" + samlIdp;
var acsUrl = serverUrl + samlAcs;
string wiaHtmlBody = "";
HttpResponseMessage response;

try
{
    response = await client.GetAsync(loginUrl);
...
try
{
    response = await client.GetAsync(response.Headers.Location);
...
var wiaUrl = response.Headers.Location.ToString();
if (wiaUrl[0] == '/') wiaUrl = serverUrl + wiaUrl;
try
{
    response = await client.GetAsync(wiaUrl);
    response.EnsureSuccessStatusCode();
    wiaHtmlBody = await response.Content.ReadAsStringAsync();
...
var wiaDoc = new XmlDocument();
try
{
    wiaDoc.Load(new StringReader(wiaHtmlBody));
    var samlNode = wiaDoc.DocumentElement.SelectSingleNode("//input[@name='SAMLResponse']");
    string samlResponse = samlNode.Attributes["value"].Value;
...

当它需要来自服务器的XML文档时抛出异常：

Exception: System.NullReferenceException: Object reference not set to an instance of an object.

类似的问题： https://serverfault.com/questions/753149/ad-fs-3-0-event-id-364-while-creating-mfa-and-sso

问题： 我需要采取哪些步骤来解决这个问题？

提前致谢。

Answer 1

wiaUrl似乎不是URL编码的，因为从response.Headers.Location检索它时，它会将其转换为字符串。这可以解释为什么base-64解码器失败，因为ADFS首先尝试对SAML请求消息进行URL解码。

换句话说，您必须将URL编码的字符串传递给client.GetAsync(wiaUrl)或URI对象。

Outlook加载项无法针对ADFS服务器进行身份验证

1 个答案: