Audit.WCF 25.0.4

Audit.WCF

WCF Audit Extension for Audit.NET library.

Generate Audit Logs for Windows Communication Foundation (WCF) service calls.

Audit.Wcf provides the server-side infrastructure to log interactions with WCF services. It records detailed information of the service method calls.

If you are looking for client-side audit, please check the Audit.WCF.Client library.

Install

NuGet Package

To install the package run the following command on the Package Manager Console:

PM> Install-Package Audit.Wcf

Usage

Decorate your WCF service class or methods with the Audit.WCF.AuditBehavior attribute.

For example:

[AuditBehavior(EventType = "{contract}.{operation}")]
public class OrderService : IOrderService
{
  public async Task<GetOrderResponse> GetOrder(GetOrderRequest request)
  {
    ...
  }
}

You can also decorate the specific methods you want to audit, for example:

public class OrderService : IOrderService
{
  [AuditBehavior]
  public async Task<GetOrderResponse> GetOrder(GetOrderRequest request)
  {
    ...
  }
}

If you can't (or do not want) to change the service code, you can also enable the audit mechanism by adding the AuditBehavior extension to your service host configuration file.

For example:

<configuration>
  <system.serviceModel>
    ...
    <extensions>
      <behaviorExtensions>
	      <add name="auditBehavior" type="Audit.WCF.AuditBehavior, Audit.WCF" />
      </behaviorExtensions>
    </extensions>

    <behaviors>
      <serviceBehaviors>
	      <behavior>
	        <auditBehavior eventType="{contract}.{operation}" />
	      </behavior>
      </serviceBehaviors>
    </behaviors>
    ...
  </system.serviceModel>
</configuration>

Configuration

The AuditBehavior attribute or extension can be configured with the following properties:

• EventTypeName: A string that identifies the event type. Can contain the following placeholders:
  • {contract}: Replaced with the contract name (service interface name)
  • {operation}: Replaces with the operation name (service method name)

To globally configure the output persistence mechanism, use the Audit.Core.Configuration class. For more details please see Event Output Configuration.

For example:

Audit.Core.Configuration.Setup()
	.UseFileLogProvider(config => config.Directory(@"C:\Logs"));

This should be done prior to the AuditScope creation, i.e. during application startup.

If you want to configure an Audit Data Provider per service instance, you can add a public instance property named AuditDataProvider to your service class and make it return the provider you want, for example:

[AuditBehavior]
public class OrderService : IOrderService
{
    public AuditDataProvider AuditDataProvider
    {
        get
        {
            return new Audit.Core.Providers.FileDataProvider()
            {
                DirectoryPath = @"C:\Logs"
            };
        }
    }
}

The library will automatically detect the property and use the given data provider for that service instance.

Output

Audit.Wcf output includes:

• Execution time and duration
• Environment information such as user, machine, domain and locale.
• Authenticated username (identity name)
• Client IP address
• Contract and Operation details
• Method parameters (in and out)
• Response object
• Faults and Exceptions details
• Comments and Custom Fields provided

With this information, you can not just know who did the operation, but also measure performance, observe exceptions thrown or get statistics about usage of your WCF service.

Output details

The following table describes the Audit.Wcf output fields:

• AuditWcfEvent

Describes an audited WCF event

• AuditWcfEventFault

Describes a WCF fault/exception

• AuditWcfEventElement

Describes an element/object related to the WCF audit event.

Customization

You can access the AuditScope object for customization from the audited methods, by the static property Audit.WCF.AuditBehavior.CurrentAuditScope.

For example:

using Audit.WCF;

[AuditBehavior]
public class OrderService : IOrderService
{
    public GetOrderResponse GetOrder(GetOrderRequest request)
    {
        AuditBehavior.CurrentAuditScope.Comment("some comment");
        AuditBehavior.CurrentAuditScope.SetCustomField("User", MySession.CurrentUser);
        ...
    }
}

See Audit.NET documentation about Custom Field and Comments for more information.

Output Sample

{
	"EventType": "IOrderService.GetOrder",
	"Environment": {
		"UserName": "Federico",
		"MachineName": "HP",
		"DomainName": "HP",
		"CallingMethodName": "WCF_IIS.IOrderService.GetData()",
		"AssemblyName": "WCF_IIS, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null",
		"Exception": null,
		"Culture": "en-GB"
	},
	"StartDate": "2016-09-13T01:31:58.6843094-05:00",
	"EndDate": "2016-09-13T01:31:58.6858324-05:00",
	"Duration": 2,
	"WcfEvent": {
		"ContractName": "IOrderService",
		"OperationName": "GetOrder",
		"InstanceQualifiedName": "WCF_IIS.OrderService, WCF_IIS, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null",
		"MethodSignature": "WCF_IIS.GetOrderResponse GetOrder(WCF_IIS.GetOrderRequest)",
		"Action": "http://tempuri.org/IOrderService/GetOrder",
		"ReplyAction": "http://tempuri.org/IOrderService/GetOrderResponse",
		"ClientAddress": "::1",
		"HostAddress": "http://localhost:8733/Design_Time_Addresses/WCF_IIS/OrderService/",
		"InputParameters": [{
			"Type": "GetOrderRequest",
			"Value": {
				"OrderId": 123
			}
		}],
		"Success": true,
		"Result": {
			"Type": "GetOrderResponse",
			"Value": {
				"Success": true,
				"Errors": null,
				"Order": {
					"OrderId": 123,
					"CustomerName": "customer",
					"Total": 10.0
				}
			}
		},
		"OutputParameters": []
	}
}