Authorization SOAP Extension in VS .NET

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The WS-Security specification defines standards for using SOAP headers to communicate credentials, digitally signing a message, and encrypting a message In most cases, you re still pretty much on your own for implementing authorization (controlling access to resources based on user credentials) Usually, authentication and authorization are insufficient because they don t protect your service from threats such as compromised data integrity/confidentiality or replay attacks If you are transmitting sensitive data, you re likely to also need a digital signature and encryption mechanisms Although you could use SSL for data encryption, WS-Security recommends the use of XML Signature and XML Encryption to digitally sign and encrypt SOAP messages See wwwLearnXmlwscom/wssecurity for more information on WS-Security[1] The following sections show you how to leverage SOAP extensions to build an infrastructure for authorization It s not my intention to create a security framework for Web services I m merely using authorization as an example to explain SOAP extensions I recommend using ready-made WS-Security implementations when they become available Database Schema To understand how the security extension handles authentication and authorization you need to first
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understand the underlying database tables shown in figure 10-6 The Users table contains a userid and password for each registered user UserPermissions contains a record for each permission that each user is allowed For example, if user01 is allowed both GetWeather and GetTemperature, UserPermissions will contain two records The first record will contain user01, Weather and the second will contain user01, Temperature The Sessions table is used to track currently logged-on users When the service authenticates a user, a new record is inserted in this table with a unique SessionId (a GUID) The LastUsed field indicates the date and time that the last request was received in this session This is useful for identifying stale sessions and removing them Finally, AccountUsage holds a record for each incoming request as a way to track Web service usage
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Figure 10-6 Database schema used by the Weather Web service
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Overall Architecture Figure 10-7 shows the overall security architecture applied to a weather Web service The Web service itself implements a LogOn and LogOff methods which delegate the real work to the SecurityMgr class (explained in the next section) The Security SoapExtension intercepts all requests (except those to LogOn and LogOff) and checks that the client is currently logged on and has the required permission (again the real work is delegated to SecurityMgr)
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Figure 10-7
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How the security SoapExtension fits in with other components to implement security
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LogOn/LogOff and Permissions Checking A class called SessionMgr is used to handle all database activities This class exposes methods named LogOn and LogOff which handle creating and removing records from the Sessions table LogOn checks the supplied user id and password against the Users table and calls CreateSession if the credentials are correct LogOff simply deletes the session record Listing 10-4 shows the implementation of LogOn, LogOff and CreateSession Listing 10-4 Authentication functions of the SessionMgr class: LogOn, LogOff and CreateSession (VBWSBook\10\Infrastructure\SessionMgrvb)
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Imports SystemWebServicesProtocols Imports SystemDataSqlClient Imports SystemConfigurationConfigurationSettings Public Class SessionMgr Private Const SESSION_NOT_FOUND As Integer = -1 Private Const NOT_ALLOWED As Integer = -2 Private Const ALLOWED As Integer = 1
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Public Shared Function LogOn(ByVal UserId As String, _ ByVal pwd As String) As String UserId = UserIdToLower() Dim cn As New _ SqlConnection(AppSettings("SoapSecurityConnStr")) Dim Sql As String = _ "SELECT LOWER(UserID) As LUser,Password FROM Users WHERE UserId='" + _ UserId + "' AND Password='" + pwd + "'"
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Dim dr As SqlDataReader
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cnOpen() Catch ex As SqlException ErrMgrLogAndThrowEx(exMessage, _ SoapExceptionServerFaultCode, _ "SessionMgrLogOn", "Try again later") End Try Dim IsValid As Boolean = False Dim sessId As String = "" Try Dim cmd As New SqlCommand(Sql, cn) dr = cmdExecuteReader() If drRead() AndAlso _ UserId = dr("LUser") AndAlso _ pwd = dr("Password") Then drClose()
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sessId = CreateSession(cn, UserId) IsValid = True Else IsValid = False End If Catch ex As SqlException ErrMgrLogAndThrowEx(exMessage, _ SoapExceptionServerFaultCode, _ "SessionMgrLogOn", "Try again later") Finally cnClose() End Try
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