Authorization in Visual Studio .NET

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Authorization
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Who is allowed to access pages is defined in the <authorization> section To allow only authenticated users, you must set the<deny> element with the attribute users=" ": <authorization> <deny users=" " /> </authorization>
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With ASPNET authorization, you can define different settings for every file or directory by specifying a <location> element around the <systemweb> configuration: <location path="Infoaspx"> <systemweb> <authorization> <allow users="*"/> </authorization> </systemweb> </location>
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You can specify authorization for users or groups of users In the <allow> and <deny> sections, the users attribute specifies users who are allowed or denied access to the resource, whereas user groups are defined with the roles attribute If Windows authentication is used, Windows groups map directly to ASPNET roles; however, you can also add custom roles to ASPNET roles
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ASPNET Web services use the same base technology as ASPNET Web applications, so the Windows authentication mechanism is available, too You cannot use Forms authentication because it is not possible to present a user interface for the client application Whereas XML Web services are platform independent, this cannot be said for Windows authentication For platform-independent [8] authentication, you can use a SOAP header, either creating this yourself, or by using Web Services Enhancement (WSE) from Microsoft In this section, both techniques are discussed
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Authentication with ASPNET Web Services and SOAP Headers
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A SOAP header is passed with the SOAP request ASPNET enables you to define a custom SOAP header by creating a class that derives from SoapHeader and applying the attribute [SoapHeader] to a Web method In the following example, the username and password will be sent inside a SOAP header Listing 12-1 shows the class AuthenticationInfo that derives from SoapHeader With such a class, you just have to define the data that is sent in the SOAP header; here the class has two public fields: Username and Password
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Listing 12-1 A Custom SOAP Header Class AuthenticationInfo
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public class AuthenticationInfo : SoapHeader { public string Username; public string Password; }
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To make the SOAP header available and required with the Web method, the attribute [SoapHeader] is applied to the method GetCourses in Listing 12-2 The [SoapHeader] attribute requires a string in the constructor that defines the name of a public field; here the public field is named authInfo and is of type AuthenticationInfo If you set this attribute, the members from theAuthenticationInfo class are passed with the SOAP request and can be read inside the Web method by using the public field
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Listing 12-2 Using the [SoapHeader] Attribute
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[WebService(Namespace="http://christiannagelcom/demoservices/2004")] public class CourseService { public AuthenticationInfo authInfo; [WebMethod] [return: XmlArray("Courses")] [return: XmlArrayItem("Course")] [SoapHeader("authInfo")] public Course[] GetCourses() { // read user information in authInfo if (!UserIdentityIsAuthenticated) { XmlQualifiedName name = new XmlQualifiedName("AuthenticationError"); SoapException ex = new SoapException( "Request denied", name); throw ex; } // }
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Listing 12-3 shows the SOAP request that must be sent from the client to the service Inside the envelope, you can see the element <soap:Header> with authentication information
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Listing 12-3 SOAP Request with a SOAP Header
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<soap:Envelope xmlns:xsi="http://wwww3org/2001/XMLSchema-instance" xmlns:xsd="http://wwww3org/2001/XMLSchema" xmlns:soap="http://schemasxmlsoaporg/soap/envelope/"> <soap:Header> <AuthenticationInfo xmlns="http://christiannagelcom/Demos/CourseServices/2004"> <Username>string</Username> <Password>string</Password> </AuthenticationInfo> </soap:Header> <soap:Body> <GetCourses xmlns="http://christiannagelcom/Demos/CourseServices/2004" /> </soap:Body> </soap:Envelope>
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When you create a Web services proxy for the client application, the class AuthenticationInfo is created As you can see in Listing 12-4, you can create an instance of the AuthenticationInfo class and set the propertyAuthenticationInfoValue of the proxy class to define the user identity information to be passed to the service
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Listing 12-4 Client Application
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CourseManagementAuthenticationInfo authInfo = new CourseManagementAuthenticationInfo( "username", "password"); CourseManagementCourseService ws = new CourseManagementCourseService(); wsAuthenticationInfoValue = authInfo; Course[] courses = wsGetCourses();
For the Web service user authentication, you can create a handler that deals with checking the user A handler is a class that implements the interface IHttpModule In the handler, you can access the SOAP header to read and verify (for example, by checking a database) the user information
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