topic Accessing Alfresco WS through WCF ? in Alfresco Archive

Accessing Alfresco WS through WCF ?

onewnan — Thu, 17 Jul 2008 16:16:33 GMT

.NET access is an important repository requirement for us at Policy Studies, Inc. To test Alfresco's capabilities in this area I downloaded the dotnet WSE examples from http://forge.alfresco.com/projects/dotnet/. However, I found that WSE requires configuration support which seems to be lacking VS

Re: Accessing Alfresco WS through WCF ?

onewnan — Fri, 18 Jul 2008 12:31:55 GMT

At this point am churning with a security interoperability issue. Am trying to reproduce in WCF the functionality of the following WSE code in dotnet2:

         
UsernameToken userToken = new UsernameToken(AuthenticationUtils.UserName, AuthenticationUtils.Ticket, (PasswordOption)2);
            service.RequestSoapContext.Security.Timestamp.TtlInSeconds = (long)300;
            service.RequestSoapContext.Security.Tokens.Add(userToken);
 ‍‍‍‍‍

Have turned on SSL in Tomcat and am using 'tomcat' as user name (repository alias) with password of 'changeit' for all of: key store, tomcat users and Alfresco users. The keystore password also is 'changeit'.

I am able to get the ticket from the authentication service but fail to access the repository service successfully with a getstores operation. Attached are WCF trace records for the SOAP request and ensuing fault–"General security error (WSSecurityEngine: Callback supplied no password for: tomcat)." Any suggestions?


<MessageLogTraceRecord
               Time="2008-07-18T05:52:52.0781250-06:00" Source="TransportSend"
               Type="System.ServiceModel.Security.SecurityAppliedMessage"
               xmlns="http://schemas.microsoft.com/2004/06/ServiceModel/Management/MessageTrace">
               <Addressing>
                  <Action>
                     http://www.alfresco.org/ws/service/repository/1.0/getStores
                  </Action>
                  <To>
                     https://localhost:8443/alfresco/api/RepositoryService
                  </To>
               </Addressing>
               <s:Envelope
                  xmlns:s="http://schemas.xmlsoap.org/soap/envelope/"
                  xmlns:u="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">
                  <s:Header>
                     <o:Security s:mustUnderstand="1"
                        xmlns:o="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">
                        <u:Timestamp u:Id="_0">
                           <u:Created>
                              2008-07-18T11:52:51.609Z
                           </u:Created>
                           <u:Expires>
                              2008-07-18T11:57:51.609Z
                           </u:Expires>
                        </u:Timestamp>
                        <o:UsernameToken
                           u:Id="uuid-8a9b624d-afb0-4efc-b29e-1fde338d91fc-2">
                           <o:Username><!–Removed–></o:Username>
                           <o:Password><!–Removed–></o:Password>
                        </o:UsernameToken>
                     </o:Security>
                  </s:Header>
                  <s:Body
                     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                     xmlns:xsd="http://www.w3.org/2001/XMLSchema">
                     <getStores
                        xmlns="http://www.alfresco.org/ws/service/repository/1.0">
                     </getStores>
                  </s:Body>
               </s:Envelope>
            </MessageLogTraceRecord>
         </DataItem>
      </TraceData>
   </ApplicationData>
</E2ETraceEvent>
<E2ETraceEvent
   xmlns="http://schemas.microsoft.com/2004/06/E2ETraceEvent">
   <System
      xmlns="http://schemas.microsoft.com/2004/06/windows/eventlog/system">
      <EventID>0</EventID>
      <Type>3</Type>
      <SubType Name="Information">0</SubType>
      <Level>8</Level>
      <TimeCreated SystemTime="2008-07-18T11:52:52.0937500Z" />
      <Source Name="System.ServiceModel.MessageLogging" />
      <Correlation
         ActivityID="{00000000-0000-0000-0000-000000000000}" />
      <Execution ProcessName="AlfrescoWS.vshost" ProcessID="368"
         ThreadID="10" />
      <Channel />
      <Computer>CODENV-L3B3320</Computer>
   </System>
   <ApplicationData>
      <TraceData>
         <DataItem>
            <MessageLogTraceRecord
               Time="2008-07-18T05:52:52.0937500-06:00" Source="TransportReceive"
               Type="System.ServiceModel.Channels.BufferedMessage"
               xmlns="http://schemas.microsoft.com/2004/06/ServiceModel/Management/MessageTrace">
               <HttpResponse>
                  <StatusCode>InternalServerError</StatusCode>
                  <StatusDescription>
                     Internal Server Error
                  </StatusDescription>
                  <WebHeaders>
                     <Transfer-Encoding>
                        chunked
                     </Transfer-Encoding>
                     <Connection>close</Connection>
                     <Content-Type>
                        text/xml;charset=utf-8
                     </Content-Type>
                     <Date>Fri, 18 Jul 2008 11:52:52 GMT</Date>
                     <Set-Cookie>
                        JSESSIONID=3B2228600B3AE4AEEBB2181E2E7864F7;
                        Path=/alfresco; Secure
                     </Set-Cookie>
                     <Server>Apache-Coyote/1.1</Server>
                  </WebHeaders>
               </HttpResponse>
               <soapenv:Envelope
                  xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
                  xmlns:xsd="http://www.w3.org/2001/XMLSchema"
                  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
                  <s:Header
                     xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
                  </s:Header>
                  <soapenv:Body>
                     <soapenv:Fault>
                        <faultcode xmlns="">
                           soapenv:Server.generalException
                        </faultcode>
                        <faultstring xmlns="">
                           WSDoAllReceiver: security processing
                           failed; nested exception is:
                           org.apache.ws.security.WSSecurityException:
                           General security error
                           (WSSecurityEngine: Callback supplied
                           no password for: tomcat)
                        </faultstring>
                        <detail xmlns="">
                           <ns1:hostname
                              xmlns:ns1="http://xml.apache.org/axis/">
                              CODENV-L3B3320
                           </ns1:hostname>
                        </detail>
                     </soapenv:Fault>
                  </soapenv:Body>
               </soapenv:Envelope>
            </MessageLogTraceRecord>

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Re: Accessing Alfresco WS through WCF ?

onewnan — Fri, 18 Jul 2008 16:06:19 GMT

As documented on the wiki the UserName SOAP header that Alfresco uses is based on an OASIS specification http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0.pdf. Reading this I find that the 'password' field isn't necessarily or typically a simple password but rather a hash of several things (Password_Digest = Base64 ( SHA-1 ( nonce + created + password ) )). Thus for grins I tried using the "ticket" as the "Password" and sure enough, Alfresco returns a getStores response. However, the SOAP message seems to be absent a security header that WCF expects (SOAP header and partial stack trace are attached).

Any suggestions? I don't see anything in the OASIS spec requiring a SOAP header in the response.

attachments


System.ServiceModel.Security.MessageSecurityException: Security processor was un
able to find a security header in the message. This might be because the message
 is an unsecured fault or because there is a binding mismatch between the commun
icating parties.   This can occur if the service is configured for security and
the client is not using security.

Server stack trace:
   at System.ServiceModel.Security.TransportSecurityProtocol.VerifyIncomingMessa
geCore(Message& message, TimeSpan timeout)
   at System.ServiceModel.Security.TransportSecurityProtocol.VerifyIncomingMessa
ge(Message& message, TimeSpan timeout)
   at System.ServiceModel.Security.SecurityProtocol.VerifyIncomingMessage(Messag
e& message, TimeSpan timeout, SecurityProtocolCorrelationState[] correlationStat
es)‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Accessing Alfresco WS through WCF ?

onewnan — Fri, 18 Jul 2008 18:13:05 GMT

It turns out we can configure .NET not to use/expect timestamps; but in this case no timestamp is passed on invocation and Alfresco/Axis takes exception:


System.ServiceModel.FaultException: 
WSDoAllReceiver: security processing failed (actions number mismatch)

‍‍‍‍‍

Is there some we to configure Alfresco/Axis to use timestamps?

I am under the impression Alfresco uses Axis due to when I get when attempting to open Web services pages in my browser. However, I do not see the usual Axis artifacts like services.xml or the happy axis page. What web services technology does Alfresco use and how can I configure options like timestamps?

Re: Accessing Alfresco WS through WCF ?

onewnan — Fri, 18 Jul 2008 23:56:12 GMT

Problem summary: Alfresco as shipped implements UsernameToken authentication expecting to receive the header in requests but not to return one in responses. WCF expects to receive a UsernameToken header in the response if the request had one.

Workaround: suppress this header to achieve interoperability.

C#:
            BindingElementCollection elements =
                  service.Endpoint.Binding.CreateBindingElements();
            elements.Find<SecurityBindingElement>().IncludeTimestamp = false;
            service.Endpoint.Binding = new CustomBinding(elements);

Axis WSDD:


   <handler name="WSSecurity" 
                 type="java:org.apache.ws.axis.security.WSDoAllReceiver">
      <!– parameter modified for WCF, was value="UsernameToken 
                  Timestamp"   />–>
      <parameter name="action" value="UsernameToken"/>
   </handler>
‍‍‍‍‍‍‍‍

Re: Accessing Alfresco WS through WCF ?

onewnan — Sun, 20 Jul 2008 01:43:04 GMT

A couple more comments about this approach/workaround:

It breaks interoperability wih Al Fresco's client. Perhaps the server could be enhanced to return a timestamp only when it receives one. This apparently is only required for WSE interoperability anyhow, not compliance.

WCF insists on SSL when using the token. This requires a a server cert, which can be prepared as discussed in server-config.wsdd. WCF however doesn't trust that cert, but can be told to ignore it http://weblogs.asp.net/jan/archive/2003/12/04/41154.aspx.

The configuration I used for UserToken was


                  <security mode="TransportWithMessageCredential">
                    <transport clientCredentialType="None" proxyCredentialType="None" realm="" />
                    <message clientCredentialType="UserName" algorithmSuite="Default" />
                  </security>
‍‍‍‍‍‍

Re: Accessing Alfresco WS through WCF ?

garker — Tue, 25 Nov 2008 19:10:10 GMT

I got .Net connection to alfresco CMIS working.

I used the .Net WSE code from the other alfresco web services as a start.

You need to reference WSE 3.0, and the CMIS WSDL files.

Here is some code that works.

            // Init the CMIS Services
            reposvc = WebServiceFactory.getRepositoryService();
            obsvc = WebServiceFactory.getObjectService();
            navsvc = WebServiceFactory.getNavigationService();

            rep = reposvc.getRepositories();

            sRepositoryID = rep[0].repositoryID;

            sRepInfoType = reposvc.getRepositoryInfo(ref sRepositoryID, out sRel, out sDesc, out sVend,
                        out sProdName, out sProdVersion, out sRootFolderID, out repcap,
                        out sCmisVersions, out anyxml, out xmlelem);

Re: Accessing Alfresco WS through WCF ?

trakhan — Wed, 14 Jul 2010 09:57:32 GMT

Ok,
have someone working example? I'd like to use WCF for webservice, but I found no working example. Sice I'm rather beginner to WCF concept solving all the issues byt myself is quite a task for me …