Retrieving password from UserName credential in WCF service

I am using the following credential binding configuration in order to pass a UserName/Password to all service calls. This is not for authentication on the service - instead I'd like to pass the UserName/Password on further downstream. I am trying to keep calls to the service standard which is why I thought that this would be a good way to pass the UserName/Password.

      <netTcpBinding>
        <binding name="tcpWithMessageSecurity">
          <security mode="Message">
            <message clientCredentialType="UserName" />
          </security>         
        </binding>
      </netTcpBinding>

 I then implement a custom UserNamePasswordValidator that does nothing. I am not sure whether there is a better way to disable validation:

    public class CustomUserNameValidator : UserNamePasswordValidator
    {
        public override void Validate(string userName, string password)
        {
            Console.WriteLine("pwd: " + password);
        }
    }

The password is available at this point (which is called when the channel is opened), but I need to get access to the password within each service method. Would I need to persist the password somehow, or is there another way to get hold of the UserName/Password from within a service method?

cruizer:

will you do impersonation?

No, the authentication won't work on impersonation, and the users won't exist as Windows accounts.

Basically I am trying to avoid having username/password parameters on all methods...

I've considered creating a custom Principal and adding the password as a property, but it is difficult to find information on where to intercept the password and create the principal and ensure that it is persisted for multiple service calls.

I am still stuck with this problem, although here is the idea behind what I want to accomplish... This could work (after some refinement) but I am sure that it is not the right way - there would be some serious limitations.

I implement a custom username validator:

        <serviceCredentials>
          <userNameAuthentication
            userNamePasswordValidationMode="Custom"
            customUserNamePasswordValidatorType="Services.Authentication.CustomValidators.CustomUserNameValidator, Services"
            />

     public class CustomUserNameValidator : UserNamePasswordValidator
    {
        public static Dictionary<string, string> Passwords;

        public override void Validate(string userName, string password)
        {
            if (!Passwords.ContainsKey(userName))
                Passwords.Add(userName, password);
        }
    }

I would then be able to retrieve the password for the user in my service methods:

Console.WriteLine(CustomUserNameValidator.Passwords[ServiceSecurityContext.Current.PrimaryIdentity.Name]);

I'm having the same issue. Do you have any working implementation?

Yep the Username is saved.. my problem was passing a password over.  That is still going to be a pain if it becomes a requirement but for now Username is good enough.