asp.net pdf 417 reader

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What you cannot see in Figure 20-2 are validation controls. Validation controls are especially important to let the user enter only valid values for a user name and a password. Remember what we mentioned in the previous chapter: Never trust user input. Validation adheres to this principle by ensuring that only valid values are entered. Here you can see all the controls contained on the login page: <form id="form1" runat="server"> <div style="text-align: center"> Please Log into the System<br /> <asp:Panel ID="MainPanel" runat="server" Height="90px" Width="380px" BorderColor="Silver" BorderStyle="Solid" BorderWidth="1px"> <br /> <table width="100%" border="0" cellpadding="0" cellspacing="0"> <tr> <td width="30%" style="height: 43px"> User Name:</td> <td width="70%" style="height: 43px"> <asp:TextBox ID="UsernameText" runat="server" Width="80%" /> <asp:RequiredFieldValidator ID="UsernameRequiredValidator" runat="server" ErrorMessage="*" ControlToValidate="UsernameText" /> <br /> <asp:RegularExpressionValidator ID="UsernameValidator" runat="server" ControlToValidate="UsernameText" ErrorMessage="Invalid username" ValidationExpression="[\w| ]*" /> </td> </tr> <tr> <td width="30%" style="height: 26px"> Password:</td> <td width="70%" style="height: 26px"> <asp:TextBox ID="PasswordText" runat="server" Width="80%" TextMode="Password" /> <asp:RequiredFieldValidator ID="PwdRequiredValidator" runat="server" ErrorMessage="*" ControlToValidate="PasswordText" /> <br /> <asp:RegularExpressionValidator ID="PwdValidator" runat="server" ControlToValidate="PasswordText" ErrorMessage="Invalid password" ValidationExpression='[\w| !" $%&/()=\- \*]*' /> </td> </tr> </table> <br /> <asp:Button ID="LoginAction" runat="server" OnClick="LoginAction_Click" Text="Login" /><br /> <asp:Label ID="LegendStatus" runat="server" EnableViewState="False" Text="" /> </asp:Panel> </div> </form> As mentioned previously, the validation controls serve two purposes. First, the RequiredFieldValidator controls ensure that both a user name and password are entered in a valid

Basically, for mainstream web applications, the fundamental tasks for implementing security (besides the issues you identify during your threat modeling session) are always the same: Authentication: First, you have to authenticate users. Authentication asks the question, who goes here It determines who is working with your application on the other end. Authorization: Second, as soon as you know who is working with your application, your application has to decide which operations the user may execute and which resources the user may access. In other words, authorization asks the question, what is your clearance level Confidentiality: While the user is working with the application, you have to ensure that nobody else is able to view sensitive data processed by the user. Therefore, you have to encrypt the channel between the client s browser and the web server. Furthermore, you possibly have to encrypt data stored on the backend (or in the form of cookies on the client) if even database administrators or other staff of the company where the web application is hosted may not view the data. Integrity: Finally, you have to make sure data transmitted between the client and the server is not changed by unauthorized actors. Digital signatures provide you with a way to mitigate this type of threat. ASP.NET includes a basic infrastructure for performing authentication and authorization. The .NET Framework base class library includes some classes in the System.Security namespace for encrypting and signing data. Furthermore, SSL is a standardized way for ensuring confidentiality and integrity for data transmitted between the client browser and the web server. Now you will take a closer look at each of these concepts.

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The IIdentity interface defines the basic information needed to represent the current user. At a minimum, this includes the following three read-only properties: AuthenticationType: Returns the type of authentication used as a string (forms, Passport, NTLM, or a custom authentication type) IsAuthenticated: Returns a Boolean value that indicates whether the user has been authenticated (true) or is anonymous (false) Name: Returns the name of the current user as a string You can access the IIdentity object that represents the current user through the IIPrincipal object. Here s an example that uses this technique to check whether the user has been authenticated: if (HttpContext.Current.User.Identity.IsAuthenticated) { lblUserName.Text = HttpContext.Current.User.Identity.Name + " is logged in"; } The type of identity object depends on the type of authentication used. All in all, four identity classes are included in the .NET Framework: System.Web.Security.FormsIdentity: Represents a user who is logged on using forms authentication. System.Security.Principal.WindowsIdentity: Represents a Windows user account. System.Web.Security.PassportIdentity: Provides a class to be used by the PassportAuthenticationModule. System.Security.Principal.GenericIdentity: Represents a generic user identity. (You can use this to create identities if you re creating a custom authentication system.)

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