What is the best method for determination ASP.net website clients? - asp.net

Question

I have a asp.net webapp, and runs in private network
I want determine PCs clients for
allow or block the requests
knows who is connected
connects only by special PCs
and more
I used IP Addresses, but anyone can connect when change the IP Address by one that passed in webapp, I want users login by just some PCs . any suggestions ?

Answer 1

LOGIN and PASSWORD going to a database of preferences... The best way to control everything about users (IP control can be bypassed, it´s not a valid control).
UPDATE
New method to pass info in URL:
To get hardware information:
Dim query As New SelectQuery("Win32_bios")
Dim search As New ManagementObjectSearcher(query)
Dim info As ManagementObject
For Each info In search.Get()
BIOS_Msg = info("version").ToString()
Next
Dim searchMainboard As New ManagementObjectSearcher("SELECT * FROM Win32_ComputerSystem")
Dim infoMain As ManagementObject
For Each infoMain In searchMainboard.Get()
Computer_Mainboard = infoMain("model").ToString()
Next
To encode Strings:
You may set a KEY and IV as byte array. The key may change according date and even some specific parameters according to the current time.
Add also:
Imports System.Security.Cryptography
Imports System.Text
Friend Function EncryptStringToBytes_Aes(ByVal plainText As String, ByVal Key() As Byte, ByVal IV() As Byte) As String
' Check arguments.
Dim encrypted() As Byte
' Create an AesCryptoServiceProvider object
' with the specified key and IV.
Using aesAlg As New AesCryptoServiceProvider()
aesAlg.Key = Key
aesAlg.IV = IV
Dim encryptor As ICryptoTransform = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV)
' Create the streams used for encryption.
Using msEncrypt As New MemoryStream()
Using csEncrypt As New CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write)
Using swEncrypt As New StreamWriter(csEncrypt)
'Write all data to the stream.
swEncrypt.Write(plainText)
End Using
encrypted = msEncrypt.ToArray()
End Using
End Using
End Using
' Return the encrypted bytes from the memory stream.
Return Convert.ToBase64(encrypted)
End Function 'EncryptStringToBytes_Aes
To decrypt it:
Friend Function DecryptStringFromBytes_Aes(ByVal cipherText As String, ByVal Key() As Byte, ByVal IV() As Byte) As String
Dim plaintext As String = Nothing
Dim SourceText as Byte() = Convert.FromBase64(CipherText)
' Create an AesCryptoServiceProvider object
' with the specified key and IV.
Using aesAlg As New AesCryptoServiceProvider()
aesAlg.Key = Key
aesAlg.IV = IV
' Create a decrytor to perform the stream transform.
Dim decryptor As ICryptoTransform = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV)
' Create the streams used for decryption.
Using msDecrypt As New MemoryStream(SourceText)
Using csDecrypt As New CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read)
Using srDecrypt As New StreamReader(csDecrypt)
' Read the decrypted bytes from the decrypting stream
' and place them in a string.
plaintext = srDecrypt.ReadToEnd()
End Using
End Using
End Using
End Using
Return plaintext
End Function 'DecryptStringFromBytes_Aes
Using these functions, you can:
- Get specific hardware info;
- Encode any string and convert it to Base64
- Pass them in URL using normal convention.
- Receive them in your code-behind and translate them.
I guess that´s the best way to get reliable and specific information of each workstation instead IP-number. You may also work with the Windows Serial Number.