Complete working Basic Authentication - Sessions Source Code in ASP

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Home » ASP Home » Sessions Home » Complete working Basic Authentication

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Title	Complete working Basic Authentication
Description	This code shows your visitors the Basic Authentication dialog (or NT Login Dialog) It also returns the password and the username
Category	ASP » Sessions
Hits	366525
Code	Select and Copy the Code
<% Response.Buffer = True Response.Clear Dim Myname, MyPass GetUser Myname, MyPass Response.Write MyName & "->" & MyPass If Len(Myname) = 0 Then Response.Status = "401 Unauthorized" Response.AddHeader "WWW-Authenticate","BASIC Realm=enter your realm here" Response.End End If Sub GetUser(LOGON_USER, LOGON_PASSWORD) Dim UP, Pos, Auth Auth = Request.ServerVariables("HTTP_AUTHORIZATION") LOGON_USER = "" LOGON_PASSWORD = "" If LCase(Left(Auth, 5)) = "basic" Then UP = Base64Decode(Mid(Auth, 7)) Pos = InStr(UP, ":") If Pos > 1 Then LOGON_USER = Left(UP, Pos - 1) LOGON_PASSWORD = Mid(UP, Pos + 1) End If End If End Sub ' Decodes a base-64 encoded string. Function Base64Decode(base64String) Const Base64CodeBase = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" Dim dataLength, Out, groupBegin dataLength = Len(base64String) Out = "" If dataLength Mod 4 <> 0 Then Err.Raise 1, "Base64Decode", "Bad Base64 string." Exit Function End If ' Now decode each group: For groupBegin = 1 To dataLength Step 4 Dim numDataBytes, CharCounter, thisChar, thisData, groupData ' Each data group encodes up To 3 actual ' bytes. numDataBytes = 3 groupData = 0 For CharCounter = 0 To 3 ' <B>Convert</B> each charac ' ter into 6 bits of data, And add it To ' an integer For temporary storage. If a ' character is a '=', there ' is one fewer data byte. (There can onl ' y be a maximum of 2 '=' In ' the whole string.) thisChar = Mid(base64String, groupBegin + CharCounter, 1) If thisChar = "=" Then numDataBytes = numDataBytes - 1 thisData = 0 Else thisData = InStr(Base64CodeBase, thisChar) - 1 End If If thisData=-1 Then Err.Raise 2, "Base64Decode", "Bad character In Base64 string." Exit Function End If groupData = 64 * groupData + thisData Next ' Convert 3-byte integer into up To 3 ch ' aracters Dim OneChar For CharCounter = 1 To numDataBytes Select Case CharCounter Case 1: OneChar = groupData 65536 Case 2: OneChar = (groupData And 65535) 256 Case 3: OneChar = (groupData And 255) End Select Out = Out & Chr(OneChar) Next Next Base64Decode = Out End Function %>

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