NTLM Client and Server Code

Demonstrates the NTLM authentication algorithm for both client and server.

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set ntlmClient = Server.CreateObject("Chilkat.Ntlm")

success = ntlmClient.UnlockComponent("Anything for 30-day trial")
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( ntlmClient.LastErrorText) & "</pre>"

End If

'  UnlockComponent only needs to be called once on the 1st object instance.

set ntlmServer = Server.CreateObject("Chilkat.Ntlm")

'  The NTLM protocol begins by the client sending the server
'  a Type1 message.

ntlmClient.Workstation = "MyWorkstation"
type1Msg = ntlmClient.GenType1()

Response.Write "<pre>" & Server.HTMLEncode( "Type1 message from client to server:") & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( type1Msg) & "</pre>"

'  If the server wishes to examine the information embedded within the
'  Type1 message, it may call ParseType1.
'  This step is not necessary, it is only for informational purposes..
type1Info = ntlmServer.ParseType1(type1Msg)

Response.Write "<pre>" & Server.HTMLEncode( "---") & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( type1Info) & "</pre>"

'  The server now generates a Type2 message to be sent to the client.
'  The Type2 message requires a TargetName.  A TargetName is
'  the authentication realm in which the authenticating account
'  has membership (a domain name for domain accounts, or server name
'  for local machine accounts).
ntlmServer.TargetName = "myAuthRealm"

type2Msg = ntlmServer.GenType2(type1Msg)
If (type2Msg = vbNullString ) Then
    Response.Write "<pre>" & Server.HTMLEncode( ntlmServer.LastErrorText) & "</pre>"

End If

Response.Write "<pre>" & Server.HTMLEncode( "Type2 message from server to client:") & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( type2Msg) & "</pre>"

'  The client may examine the information embedded in the Type2 message
'  by calling ParseType2, which returns XML.  This is only for informational purposes
'  and is not required.
type2Info = ntlmClient.ParseType2(type2Msg)

Response.Write "<pre>" & Server.HTMLEncode( "---") & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( type2Info) & "</pre>"

'  The client will now generate the final Type3 message to be sent to the server.
'  This requires the Username and Password:
ntlmClient.UserName = "test123"
ntlmClient.Password = "myPassword"

type3Msg = ntlmClient.GenType3(type2Msg)
If (type3Msg = vbNullString ) Then
    Response.Write "<pre>" & Server.HTMLEncode( ntlmClient.LastErrorText) & "</pre>"

End If

Response.Write "<pre>" & Server.HTMLEncode( "Type3 message from client to server:") & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( type3Msg) & "</pre>"

'  The server may verify the response by first "loading" the Type3 message.
'  This sets the various properties such as Username, Domain, Workstation,
'  and ClientChallenge to the values embedded within theType3 message.
'  The server may then use the Username to lookup the password.
'  Looking up the password is dependent on your infrastructure.  Perhaps your
'  usernames/passwords are stored in a secure database.  If that's the case, you would
'  write code to issue a query to get the password string for the given username.
'  Once the password is obtained, set the Password property and then
'  generate the Type3 response again.  If the server's Type3 response matches
'  the client's Type3 response, then the client's password is correct.

success = ntlmServer.LoadType3(type3Msg)
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( ntlmServer.LastErrorText) & "</pre>"

End If

'  The Username property now contains the username that was embedded within
'  the Type3 message.  It can be used to lookup the password.
clientUsername = ntlmServer.UserName

'  For this example, we'll simply set the password to a literal string:
ntlmServer.Password = "myPassword"

'  The server may generate the Type3 message again, using the client's correct
'  password:
expectedType3Msg = ntlmServer.GenType3(type2Msg)

Response.Write "<pre>" & Server.HTMLEncode( "Expected Type3 Message:") & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( expectedType3Msg) & "</pre>"

'  If the Type3 message received from the client is exactly the same as the
'  expected Type3 message, then the client must've used the same password,
'  and authentication is successful.


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