SharePoint Custom Webservice - web-services

Question

I have a Custom SharePoint webservice for performing certain actions. User credentials are passed via Soap Header. The credentials reach the webservice without any problem.
Issue:
The following code returns "Unauthorized Error" if I did not make the webservice call with user credentials.
WebService Method
[WebMethod(Description = "Test Credentials")]
[SoapDocumentMethod(Binding = "SPService")]
[SoapHeader("Authen")]
public string[] TestCredentials(string siteURL)
{
string[] credentials = new string[3];
using (SPSite site = new SPSite(siteURL))
{
using (SPWeb spW = site.OpenWeb())
{
credentials[0] = Authen.CallingUserName;
credentials[1] = Authen.CallingUserPwd;
credentials[2] = siteURL;
}
}
return credentials;
}
Client Code
SPService.SPService spS = new SPService.SPService();//Webservice class
SPService.UserAuth ua = new SPService.UserAuth(); //Soap Header class
ua.CallingUserName = UserName; // User name
ua.CallingUserPwd = Password; // Password for the Username
spS.UserAuthValue = ua; // assigning the credential to the SoapHeader.
//System.Net.NetworkCredential nc = new NetworkCredential(UName, pwd, Domain);
//spS.Credentials = new NetworkCredential(UName, pwd, Domain);
string[] str = new string[3];
str = spS.TestCredentials(txt_URL.Text,"Shared Documents");
When the Network credential is commented out I get the The request failed with HTTP status 401: Unauthorized. error. If the credential is used then the webservice returns the expected value.
Requirement of the Custom WebService is to use WS-Security to pass the Login credentials and use the same to login into the SharePoint site.
Some help would be useful. Kindly let me know if you need more detail regarding this.

Answer 1

The SPSite constructor will require authentication to intialise correctly as it is accessing Sharepoint. You can instantiate it using credentials you have constructed before hand in a similar manner to what is described here