c# print barcode font Prompt for a username and password in .NET framework

Creator Quick Response Code in .NET framework Prompt for a username and password

Prompt for a username and password
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Console.WriteLine( Enter username in the format domain\username: )
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Dim username As String = Console.ReadLine
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Console.WriteLine( Enter password: )
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Dim password As String = Console.ReadLine
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Create the Web services object Note that object names have Wse appended Dim services As com.northwindtraders.www.EmployeeServicesWse = New com.northwindtraders.www.EmployeeServicesWse Specify a UsernameToken element Dim token As New UsernameToken (username, password, PasswordOption.SendPlainText) services.RequestSoapContext.Security.Tokens.Add(token) Call the GetEmployeePhone Number Web method
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with the credentials the user provided.
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Provide an explanation if the credentials were rejected.
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Console.WriteLine( Phone number: + services.GetEmployeePhoneNumber( 12345 )) Catch ex As Exception Console.WriteLine( Error: + ex.Message) End Try End Sub End Module
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When run, the console application generates the following output when valid Win dows credentials are provided:
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Enter username in the format domain\username:
northwindtraders\administrator
Enter password:
V4l1dU53R
Phone number: 555-555-0123
This would result in an XML request being generated with a WS-Security UsernameToken element resembling the following:
<wsse:UsernameToken> <wsse:Username>northwindtraders\administrator</wsse:Username> <wsse:Password Type="wsse:PasswordText"> V4l1dU53R
</wsse:Password>
<wsse:Nonce>
LoE3fjEoNnekfjLWeXz==
</wsse:Nonce>
<wsu:Created>2004-05-24T13:23:42Z</wsu:Created>
</wsse:UsernameToken>
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10
Improving Security When Using External Components and Services
When invalid credentials are provided, the WSE Web service rejects the credentials, and the runtime throws a System.Web.Services.Protocols.SoapHeaderException excep tion. The console application displays the following output in this circumstance:
Enter username in the format domain\username:
Attacker
Enter password:
H4x0rU
Error: The security token could not be authenticated or authorized
How to Create a WSE Server that Uses Authorization
An earlier example demonstrated how to create a Web services server that uses WSE without writing any code. This technique enables you to easily extend existing Web services; however, it does not take advantage of WSE s capabilities. You can examine the Web services request to check the authentication information and the user s credentials by creating a SoapContext object by calling the RequestSoapContext.Current method. The SoapContext.Tokens collection contains the same set of tokens the client added, including the UsernameToken object if that type of authenti cation was used. The following method expands the previous WSE sample server, verifies the type of authentication, verifies that a hashed (rather than plaintext) password was provided, and verifies that the user name is Administrator. When these conditions are not met, an exception is thrown.
[WebMethod]
public string GetEmployeePhoneNumber(string id)
// Get the current request
SoapContext requestContext = RequestSoapContext.Current;
// Reject request if there is more than one security token
if (requestContext.Security.Tokens.Count != 1)
throw new SoapException( Request must have one security token",
SoapException.ClientFaultCode);
foreach (SecurityToken token in requestContext.Security.Tokens) {
// Reject request if not a UsernameToken type
if (!(token is UsernameToken))
throw new SoapException( UsernameToken required",
SoapException.ClientFaultCode);
// Reject request if not using a hashed password.
UsernameToken userToken = (UsernameToken)token;
if (userToken.PasswordOption != PasswordOption.SendHashed)
throw new SoapException( Invalid password type", SoapException.ClientFaultCode);
Lesson 2: Maximizing Security for Web Services
// Verify that account is named Administrator
if (userToken.Username.ToLower() != administrator )
throw new SoapException( Account not authorized",
SoapException.ClientFaultCode);
// TODO: Fill in database query
return 555-555-0123";
10-25
<WebMethod()> _ Public Function GetEmployeePhoneNumber(ByVal id As String) As String
Get the current request
Dim requestContext As SoapContext = RequestSoapContext.Current
Reject request if there is more than one security token If Not (requestContext.Security.Tokens.Count = 1) Then Throw New SoapException( Request must have one security token", SoapException.ClientFaultCode)
End If
For Each token As SecurityToken In requestContext.Security.Tokens
Reject request if not a UsernameToken type
If Not (TypeOf token Is UsernameToken) Then
Throw New SoapException ( UsernameToken required",
SoapException.ClientFaultCode)
End If
Reject request if not using a hashed password.
Dim userToken As UsernameToken = CType(token, UsernameToken)
If Not (userToken.PasswordOption = PasswordOption.SendHashed) Then
Throw New SoapException ( Invalid password type",
SoapException.ClientFaultCode)
End If
Verify that account is named Administrator
If Not (userToken.Username.ToLower = administrator ) Then
Throw New SoapException ( Account not authorized",
SoapException.ClientFaultCode)
End If
Next
TODO: Fill in database query
Return 555-555-0123"
End Function
Practice: Maximizing Security for Web Services
In this practice, you create a Web service server that requires authentication and a cli ent that prompts the user for authentication. Read the scenario and then complete the exercise that follows. If you are unable to answer a question, review the lesson and try the question again. You can find answers to the questions in the Questions and Answers section at the end of this chapter.
10-26
10
Improving Security When Using External Components and Services
Scenario
You are a developer for Blue Yonder Airlines. Your manager, Tony Krijnen, has asked you to create a proof-of-concept Web service server and client to enable ticketing agents to query the company s database to determine the number of available seats on a given flight. Tony calls you into his office. This should be easy. I just want to see that these Web services work okay and that they can use authentication and authorization. Write me a Web services server that returns the number of seats available on a flight when the Web services client provides a flight num ber. For now, just return the number 5 to the client, regardless of what flight number the client requests. It s just a proof-of-concept. Call the application Ticketing. Require that the user provide the client with a user name and password, and proof that she or he is a member of the Agents group in our domain. Also, write a Web services client using Windows Forms that can talk to the application, and call the client Agent.
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