I recently changed my binding configurations to allow impersonation in my WCF service. By implementing this, I was required to use a buffered TransferMode.Buffered as opposed to streamed. While this seemed to fix my problems for a while, I noticed that large files (>200MB) would throw an exception when trying to allocate the MemoryStream to pass in the message. My colleagues as well as google led me to believe that Chunking was the answer and I've since tried to implement a version of this sample:
MSDN Chunking Article
I modified the TCPChunkingBinding class to derive from BasicHttpBinding instead of Binding and added the requisite BasicHttpSecurity attributes that we used before trying chunking.
All the endpoints that previously used BasicHttpBinding now use TCPChunkingBinding. Here are the modifications I made to the TCPChunkingBinding class:
TcpChunkingBinding : BasicHttpBinding, IBindingRuntimePreferences
...
void Initialize()
{
be = new ChunkingBindingElement();
tcpbe = new TcpTransportBindingElement();
tcpbe.TransferMode = TransferMode.Buffered; //no transport streaming
tcpbe.MaxReceivedMessageSize = ChunkingUtils.ChunkSize + 100 * 1024; //add 100KB for headers
this.MessageEncoding = WSMessageEncoding.Mtom;
this.SendTimeout = new TimeSpan(0, 5, 0);
this.ReceiveTimeout = this.SendTimeout;
this.TransferMode = TransferMode.Buffered;
BasicHttpSecurity security = new BasicHttpSecurity();
security.Mode = BasicHttpSecurityMode.TransportCredentialOnly;
security.Transport.ClientCredentialType = HttpClientCredentialType.Windows;
security.Transport.ProxyCredentialType = HttpProxyCredentialType.None;
security.Transport.Realm = string.Empty;
security.Message.ClientCredentialType = BasicHttpMessageCredentialType.UserName;
security.Message.AlgorithmSuite = System.ServiceModel.Security.SecurityAlgorithmSuite.Default;
this.Security = security;
The error I get is
The contract operation 'DownloadStream' requires Windows identity for automatic impersonation. A Windows identity that represents the caller is not provided by binding ('TcpChunkingBinding','http://tempuri.org/') for contract ('ITestService','http://tempuri.org/'.
When i call host.open() in Host.cs of the Service class in the sample.
Basically my question is can someone help me figure out how to get this sample working with impersonation and chunking?
Before anyone answers, prior to trying the chunking road I maxed out every buffer setting and I cannot use Streaming transfermode because of the necessity for impersonation. Thanks in advance.
Related
I'm kind of new to the whole WCF and SOAP topic so please be kind.
I'm using a generated SOAP Client with .net6. In another project we successfully worked with the same Web Service using the old .net Framework 2.0 Web References and the same credentials.
Strange enough everything seemed to work fine at first. Until I realized, that it does not use the given credentials to authenticate. Instead it authenticates with my own domain user.
I also tried to get it to work with explicitly setting the binding with a BasicHttpBinding but I only could get the same broken logic to work or I got various authentication/protocol/security errors.
So it seems the authentication is basically working. It just doesn't use the provided credentials. So my question is: How can I configure it to work with the provided identity?
I also found out that it might have anything to do with a cached Windows token. But how can I get rid of it. How to prevent caching in the first place?
EDIT:
Specified the variable types explicitly.
string url = "http://someServer/AdministrationService.asmx";
AdministrationServiceSoapClient client = new AdministrationServiceSoapClient(
AdministrationServiceSoapClient.EndpointConfiguration.AdministrationServiceSoap,
url);
WindowsClientCredential credential = client.ClientCredentials.Windows;
credential.ClientCredential.UserName = "username";
credential.ClientCredential.Password = "password";
credential.ClientCredential.Domain = "DOMAIN";
GetServerInfoRequest getServerInfoRequest = new GetServerInfoRequest
{
// some stuff set here
};
GetServerInfoRequest getServerInfoReply = await client.GetServerInfoAsync(getServerInfoRequest);
As far as I know, BasicHttpBinding has security disabled by default, but can be added setting the BasicHttpSecurityMode to a value other than None in the constructor. It can be configured according to the instructions in BasicHttpBinding and BasicHttpBinding Constructors.
By default, setting up client credentials involves two steps: determining the type of client credential required by the service and specifying an actual client credential, as described in this document.
After waiting a day it is working. It seems that the cached credentials became invalid somehow.
Strange enough the simple service creation from above is not working anymore. Instead I have to use the following.
var client = new AdministrationServiceSoapClient(
new BasicHttpBinding()
{
Security = new BasicHttpSecurity()
{
Mode = BasicHttpSecurityMode.TransportCredentialOnly,
Message = new BasicHttpMessageSecurity()
{
ClientCredentialType = BasicHttpMessageCredentialType.UserName,
},
Transport = new HttpTransportSecurity()
{
ClientCredentialType = HttpClientCredentialType.Windows,
ProxyCredentialType = HttpProxyCredentialType.Windows,
}
},
},
new EndpointAddress(url));
I am quite new to WCF and trying to get my head around the security. I am still reading and learning, but I came to a point where I got a working version of WCF with Certificate authentication. I know that the code has some weaknesses; however, my initial goal was to create communication using certificate authentication. Also, I wanted to create everything programmatically (no Web.config configurations for the services or clients). The reason for this is that the client should be able to link an Assembly (Class Library) and get access to the server. Also, I am loading the certificates from the file system (again, I know this is not secure). I would like to get a little bit feedback.
The following client snippet is creating an object that I can use to connect to the server. The anonymous type T is my service interface e.g. IService.
Here is my client implementation:
var url = "URL TO WS";
var binding = new WSHttpBinding
{
Security =
{
Mode = SecurityMode.Message,
Message = {ClientCredentialType = MessageCredentialType.Certificate}
}
};
var endpoint = new EndpointAddress(url);
var channelFactory = new ChannelFactory<T>(binding, endpoint);
if (channelFactory.Credentials != null)
{
channelFactory.Credentials.ClientCertificate.Certificate =
new X509Certificate2(#"PATH\TO\Client.pfx"); // Client Certificate PRIVATE & PUBLIC Key
channelFactory.Credentials.ServiceCertificate.Authentication.CertificateValidationMode = X509CertificateValidationMode.None; // I know this is not good, but I dont have a valid certificate from a trusted entity
}
wcfClient = channelFactory.CreateChannel();
return wcfClient;
The service is a bit more complex. I use .svc files with their code-behind. If I understand the use of .svc files correctly, then I believe this is the entry point where the .NET framework creates a ServiceHost and automatically opens it? In my implementation I do not open the ServiceHost, I only implemented a ServiceHostFactoryBase and referenced it in the .svc Markup language. Look at the Factory section - this is the part where I implement my custom Host Factory.
<%# ServiceHost Language="C#" Debug="true"
Service="Service.Services.LevelService" CodeBehind="LevelService.svc.cs"
Factory="Service.Security.ServiceHostFactory.HostFactory" %>
And my custom Host Factory looks like this:
public class HostFactory : ServiceHostFactoryBase
{
public override ServiceHostBase CreateServiceHost(string constructorString, Uri[] baseAddresses)
{
var serviceType = Type.GetType(constructorString);
if (serviceType.GetInterfaces().Count() != 1)
throw new NotImplementedException("The service can only have one implemented interface");
var interfaceType = serviceType.GetInterfaces()[0];
var myServiceHost = new ServiceHost(serviceType, baseAddresses);
var httpBinding = new WSHttpBinding();
httpBinding.Security.Message.ClientCredentialType = MessageCredentialType.Certificate;
httpBinding.Security.Mode = SecurityMode.Message;
myServiceHost.Credentials.ServiceCertificate.Certificate = new X509Certificate2(#"PATH\TO\Server.pfx");
myServiceHost.Credentials.ClientCertificate.Authentication.CertificateValidationMode = X509CertificateValidationMode.Custom;
myServiceHost.Credentials.ClientCertificate.Authentication.CustomCertificateValidator = new MyX509CertificateValidator();
myServiceHost.Credentials.ClientCertificate.Certificate = new X509Certificate2(#"PATH\TO\Client.cer");
myServiceHost.AddServiceEndpoint(interfaceType, httpBinding, String.Empty);
return myServiceHost;
}
}
The custom validator doess't do much yet, but here it is as well:
public class MyX509CertificateValidator : X509CertificateValidator
{
public override void Validate(X509Certificate2 certificate)
{
// Check that there is a certificate.
if (certificate == null)
{
throw new ArgumentNullException("certificate");
}
// Check that the certificate issuer matches the configured issuer.
//throw new SecurityTokenValidationException("Certificate was not issued by a trusted issuer");
}
}
If I understand correctly, the Server has ONLY the PUBLIC key of the client registered since I only reference the .cer file.
My big question is now, if I would like to get anything like this on a production server - and lets assume nobody will actually get the executables (including the certificates), would this be a possible solution to keep unwanted people out of my webservice? Basically, I don't want anybody else consuming my webservice - only if you have the proper certificate. Also, how much of an issue is the part where I set on the client:
CertificateValidationMode = X509CertificateValidationMode.None
I know there are many questions - but overall, I would like to know if I made some fundamental mistakes in this implementation.
Ok,
after going through a lot of tutorials and demo applications, I figured out that the best way to go ahead is actually using the Certificate Store on Windows. However, I still might consider a hybrid solution where the Server has the certificates in the Certificate store and the client has it embedded in a resource. If you are struggling with WCF and Certificates, have a look at those links:
IIS7 Permissions Overview - ApplicationPoolIdentity
I was able to create Transport as well as Message secured WCF web services. I would suggest to READ the linked articles because there is so much information that will make you understand certificates and their usage. Especially when dealing with self-singed certificates!
I ended up implementing wsHttpBinding using Message Security Mode + Client Certificate with ChainTrust.
Hope this will help someone else!
This question has been discussed in several topics here but I could not find the answer for me.
What I'm trying to do is use an IP camera through the Onvif interface. I've generated the web services from the WSDL files available in the Onvif homepage, and added the custom SOAP authentication code as suggested here, and I am able to retrieve the device capabilities etc. etc.
But for some services, e.g, PTZ control, also HTTP authentication is needed. My code removes the ClientCredentials behaivor (so yeah, I guess setting them does not make any sense, but I still left those lines in hope that maybe the HTTP transport would try to use them):
HttpTransportBindingElement httpBindingElement = new HttpTransportBindingElement();
httpBindingElement.AuthenticationScheme = AuthenticationSchemes.Basic;
...
PTZClient ptzClient = new PTZClient(customBinding, endPointAddress);
ptzClient.Endpoint.Behaviors.Remove(typeof(System.ServiceModel.Description.ClientCredentials));
UsernameClientCredentials onvifCredentials = new UsernameClientCredentials(new UsernameInfo(_username, _password));
ptzClient.Endpoint.Behaviors.Add(onvifCredentials);
ptzClient.ClientCredentials.UserName.UserName = _username;
ptzClient.ClientCredentials.UserName.Password = _password;
Still when I look at wireshark, i see that the SOAP authentication is generated but no HTTP authentication header is set (well, I already expected that since i have a custom behaivor here). So the question is, if I am creating the binding this way, what are my best options to add HTTP authentication headers? Can I just add a message inspector, and if so, any examples? Must I create a different transport binding? I've seen people advising others to use BasicHttpBinding and then setting the Security property on that, but where do the credentials go in that case and how do I apply the BasicHttpBinding instance to my binding? Are there any callbacks in the WCF that get triggered by the HTTP 401 code that i can hook up to and then provide the header? This is actually my first experience with WCF and so far I've done everything from examples found in the internet, but as for this particular issue I haven't been able to find anything.
If anyone is interested this is how I got it working. I combined the BasicHttpBinding with the client credentials in a following way:
TransportSecurityBindingElement transportSecurity = new TransportSecurityBindingElement();
// UsernameCredentials is a class implementing WS-UsernameToken authentication
transportSecurity.EndpointSupportingTokenParameters.SignedEncrypted.Add(new UsernameTokenParameters());
transportSecurity.AllowInsecureTransport = true;
transportSecurity.IncludeTimestamp = false;
TextMessageEncodingBindingElement messageEncoding = new TextMessageEncodingBindingElement(MessageVersion.Soap12, Encoding.UTF8);
HttpClientCredentialType[] credentialTypes = new HttpClientCredentialType[3] { HttpClientCredentialType.None, HttpClientCredentialType.Basic, HttpClientCredentialType.Digest };
...
foreach (HttpClientCredentialType credentialType in credentialTypes)
{
BasicHttpBinding httpBinding = new BasicHttpBinding(BasicHttpSecurityMode.TransportCredentialOnly);
httpBinding.Security.Transport.ClientCredentialType = credentialType;
BindingElementCollection elements = new BindingElementCollection(new BindingElement[1]{messageEncoding});
foreach(BindingElement element in httpBinding.CreateBindingElements())
{
if (element is TextMessageEncodingBindingElement)
continue;
elements.Add(element);
}
CustomBinding customBinding = new CustomBinding(elements);
DeviceClient deviceClient = new DeviceClient(customBinding, endPointAddress);
if (credentialType == HttpClientCredentialType.Basic)
{
// Set all credentials, not sure from which one WCF actually takes the value
deviceClient.ClientCredentials.UserName.UserName = pair[0];
deviceClient.ClientCredentials.UserName.Password = pair[1];
}
else if (credentialType == HttpClientCredentialType.Digest)
{
deviceClient.ClientCredentials.HttpDigest.AllowedImpersonationLevel = System.Security.Principal.TokenImpersonationLevel.Delegation;
deviceClient.ClientCredentials.HttpDigest.ClientCredential.UserName = pair[0];
deviceClient.ClientCredentials.HttpDigest.ClientCredential.Password = pair[1];
}
}
This works efficiently with a device for which we do not know the authentication mode and works on both (HTTP/SOAP) authentication level.
I detailed how HTTP digest works in another answer.
Remember that only functions of class PRE_AUTH, according to ยง5.12.1 of the Core spec, require authentication.
You should invoke a function of any class but PRE_AUTH without any form authentication. If you get a HTTP 401 then you have to use HTTP digset, otherwise you'll have to got with WS-UsernameToken.
You can't directly use HTTP digest because you'll need at least the device to send you the challange for HTTP digest.
I'm trying to disable SoapProcessing for an endpoint (yes, it needs to be done, don't ask why, and message inspectors will not work):
MSDN docs for soapProcessing
However, all of the documentation I've found seems to rely on setting this value in the app's config file. I am developing a plugin for an application that does not allow me to include a separate config file, so I have to set up the endpoint and bindings and all that via code:
// Create transport binding
BasicHttpBinding binding = new BasicHttpBinding(BasicHttpSecurityMode.TransportWithMessageCredential);
binding.Security.Message.ClientCredentialType = BasicHttpMessageCredentialType.UserName;
// Create client
MySyncPortClient _service = new MySyncPortClient(binding, new EndpointAddress("https://path/to/service"));
_service.ClientCredentials.UserName.UserName = "foo";
_service.ClientCredentials.UserName.Password = "bar";
// Set custom bindings
BindingElementCollection elements = _service.Endpoint.Binding.CreateBindingElements();
elements.Find<SecurityBindingElement>().IncludeTimestamp = false;
_service.Endpoint.Binding = new CustomBinding(elements);
// Perform a request
_service.DoSomething();
If anyone can point me in the right direction, I'd appreciate it. And not to be rude, but please do not suggest using a config file. It -NEEDS- to be done via code. If you want a full explanation, I can provide one separately.
Closing this out - apparently it can't be done.
I'm trying to establish a communication with an ONVIF camera, and I'm getting some strange errors that I can't fully comprehend due to my lack of experience with Web Services, ONVIF and C#. I'm on .NET 4.0 and using Visual Studios 2010
EndpointAddress endPointAddress = new EndpointAddress("http://192.168.3.246:80/onvif/device_service");
WSHttpBinding bind = new WSHttpBinding();
bind.Security.Mode = SecurityMode.Message;
bind.Security.Message.ClientCredentialType = MessageCredentialType.UserName;
DeviceClient temp = new DeviceClient(bind, endPointAddress);
temp.ClientCredentials.UserName.UserName = myusername;
temp.ClientCredentials.UserName.Password = mypassword;
SystemDateTime s = temp.GetSystemDateAndTime();
This lead to a crash with the erorr "The data in element 'a:Action' must be understood but cannot be handled". I've tried to manually catch the request and to execute it with the "s:mustUnderstand="1" flags turned off, but I then get an "Method 't:RequestSecurityToken' not implemented: method name or namespace not recognized" error.
Is my ONVIF camera bugged, or am I doing something wrong ? I've been trying various things since 3 days to try to connect to that camera beyond simple, non-secured informations like GetSystemDateAndTime() and GetDeviceInformation(), but I'm stuck.
Allright, I hope it'll enventually help other people stuck like I was:
HttpTransportBindingElement httpBinding = new HttpTransportBindingElement();
httpBinding.AuthenticationScheme = AuthenticationSchemes.Digest;
var messegeElement = new TextMessageEncodingBindingElement();
messegeElement.MessageVersion = MessageVersion.CreateVersion(EnvelopeVersion.Soap12, AddressingVersion.None);
CustomBinding bind = new CustomBinding(messegeElement, httpBinding);
// Add our custom behavior - this require the Microsoft WSE 3.0 SDK
PasswordDigestBehavior behavior = new PasswordDigestBehavior(CameraASCIIStringLogin, CameraASCIIStringPassword);
DeviceClient client = new DeviceClient(bind, serviceAddress);
client.Endpoint.Behaviors.Add(behavior);
// We can now ask informations
client.GetSystemDateAndTime();
client.GetNetworkInterfaces();
client.GetScopes();
client.GetRelayOutputs();
client.GetWsdlUrl();
The secret was to set the right envelope settings in messegeElement (Soap12 because our camera only support this, AdressingVersion.None to remove the "mustunderstand" flag) and to add the Microsoft WSE 3.0 as a library even if I'm on .NET 4.0 and using Visual Studio 2010. This will enable you to use their provided UserNameToken functions without having to re-create them yourself from scratch.