ACC: How to Change User Passwords Programmatically Using DAO

ID: Q179198


The information in this article applies to:
  • Microsoft Access versions 7.0, 97


SUMMARY

Advanced: Requires expert coding, interoperability, and multiuser skills.

At times, you may want to reset or change a user's password without using the user interface. This article demonstrates several sample functions that you can use to accomplish this task.


MORE INFORMATION

Microsoft provides programming examples for illustration only, without warranty either expressed or implied, including, but not limited to, the implied warranties of merchantability and/or fitness for a particular purpose. This article assumes that you are familiar with the programming language being demonstrated and the tools used to create and debug procedures. Microsoft support professionals can help explain the functionality of a particular procedure, but they will not modify these examples to provide added functionality or construct procedures to meet your specific needs. If you have limited programming experience, you may want to contact a Microsoft Certified Solution Provider or the Microsoft fee-based consulting line at (800) 936-5200. For more information about Microsoft Certified Solution Providers, please see the following page on the World Wide Web:

http://www.microsoft.com/mcsp/
For more information about the support options available from Microsoft, please see the following page on the World Wide Web:

http://www.microsoft.com/support/supportnet/overview/overview.asp

Resetting or Changing a User's Password When Password Has Been Forgotten

The following sample function allows a user to reset or change the password of another user if the password has been forgotten.

Because it is not advisable to allow all users to reset or change the passwords of others, the function requires that the username and password of a user with administrative rights (a member of the "admins" group, for example) be passed for the function to complete its work.

To create this example, follow these steps:
  1. Open your database in Microsoft Access 7.0 or 97.


  2. In the Database window, click the Modules tab, and then click New.


  3. Type or paste the following code in the module that you have just created:


  4. 
        Public Sub ChangeResetPassword(StrAction As String, StrUsername As _
        String, StrAdminLogon As String, StrAdminPass As String, Optional _
        StrNewPassword As Variant)
    
        Dim ws As Workspace
        On Error GoTo ChangeResetPassword:
    
        ' Create a new Administrative Workspace. If The StrAction passed to the
        ' function is "Change" then change the Password of the User named in
        ' StrUsername to the password saved in StrNewPassword.
        ' If the StrAction passed is "Reset", Then reset the password of
        ' the User mentioned in StrUsername. If neither "Change" or "Reset"
        ' is passed to the function in the StrAction argument, inform the
        ' user of an error and exit the procedure.
    
        Set ws = DBEngine.CreateWorkspace("AdminWorkspace",StrAdminLogon, _
        StrAdminPass)
        If StrAction = "change" Then
    
             If Not IsNull(StrNewPassword) Then
                ws.Users(StrUsername).NewPassword "", StrNewPassword
                MsgBox "Password Change Successful", vbOKOnly
             Else
                 MsgBox "When Attempting to Change A User's Password, You " & _
                   "Must Include a New Password", vbOKOnly
             End If
    
        ElseIf StrAction = "reset" Then
            ws.Users(StrUsername).NewPassword "", ""
            MsgBox "Password Successfully Reset", vbOKOnly
        Else
            MsgBox "You must Select a StrAction of either '" & "Change'" & _
              "' or '" & "Reset'.", vbOKOnly
        End If
    
        ws.Close
        Set ws = Nothing
        Exit Sub
    
        ChangeResetPassword:
             MsgBox Err.Description
       End Sub 
  5. Save the module as SecurityCode and close it.


Allowing a User to Change His or Her Own Password

The next sample function allows a user to change his or her own (and only his or her own) password. For the function to operate correctly, it must be passed the Username, Old Password, and New Password of the user.

To create this example, follow these steps:
  1. Open your database in Microsoft Access 7.0 or 97.


  2. In the Database window, click the Modules tab, and select the SecurityCode module that you created in the example above.


  3. Click Design, and type or paste the following code:


  4. 
        Public Sub ChangeUserPassword(StrUsername As String, StrOldPassword _
        As String, StrNewPassword As String)
    
        On Error GoTo ChangeUserPassword_Err:
        DBEngine(0).Users(StrUsername).NewPassword StrOldPassword, _
          StrNewPassword
    
        MsgBox "Password Change Successful", vbInformation
        Exit Sub
    
        ChangeUserPassword_Err:
            MsgBox Err.Description
    
        End Sub 
  5. Save the Module and close it.


Usage Example

The following sample form and associated code uses both functions that you created earlier in the article to demonstrate their functionality. The form contains text boxes that must be filled with appropriate pieces of information that are fed to the sample functions and command buttons to run the functions themselves.

The form allows users to:

   - Change their own password. 
The form allows administrators to:

   - Reset a user's password.
   - Change a user's password. 
To create the form, follow these steps:
  1. Create a new blank form and save it as frmChangePasswords.


  2. With the frmChangePasswords form open in Design View, add the following text box, label, and command button controls. Each label is associated with a specific text box and should be placed near the text box on the form.


  3. 
          Text Box:
          -----------------
          Name: txtUserName
    
          Label:
          --------------------
          Name: lblUserName
             Caption: UserName
    
          Text Box:
          -----------------------
          Name: txtOldPassword
             Input Mask: Password
    
          Label:
          ------------------------
          Name: lblOldPassword
             Caption: Old Password
    
          Text Box:
          ------------------------
          Name: txtNewPassword
             Input Mask: Password
    
          Label:
          ------------------------
          Name: lblNewPassword
             Caption: New Password
    
          Text Box:
          -----------------------
          Name: txtVerifyPassword
             Input Mask: Password
    
          Label:
          ---------------------------
          Name: lblVerify Password
             Caption: Verify Password
    
          Text Box:
          -----------------------
          Name: txtAdminUsername
             Input Mask: Password
    
          Label:
          -----------------------------------
          Name: lblAdminUsername
             Caption: Administrative UserName
    
          Text Box:
          -----------------------
          Name: txtAdminPassword
             Input Mask: Password
    
          Label:
          -----------------------------------
          Name: lblAdminPassword
             Caption: Administrative Password
    
          Command Button:
          -----------------------------------------------
          Name: CmdChange
             Caption: Change Password(Non-Administrative)
             Height: 720
             Width: 1440
    
          Command Button:
          -------------------------------------------
          Name: CmdChangeAdmin
             Caption: Change Password(Administrative)
             Height: 720
             Width: 1440
    
          Command Button:
          ------------------------------------------
          Name: CmdReset
             Caption: Reset Password(Administrative)
             Height: 720
             Width: 1440 
  4. With the frmTestPassword form open in Design view, on the View menu, click Code, and then type the following line in the Form module Declarations section if it is not already there:


  5. 
    Option Explicit 
  6. Type or paste the following code in the Form module:


  7. 
    Private Sub CmdChange_Click()
    
    On Error GoTo CmdChange_err
    ' Make sure the password typed in the New Password text box
    ' matches what has been typed in the Verify Password text box.
    If Me!txtNewPassword <> Me!txtVerifyPassword Then
       MsgBox "The New and Verified Passwords Do Not Match. " & _
         "Please Re-enter", vbCritical
       Me!txtNewPassword = ""
       Me!txtNewVerifyPassword = ""
       Me!txtNewPassword.SetFocus
    Else
       ' Check to make sure the Old Password has been filled in and
       ' if it has, change the password.
       If IsNull(Me!txtOldPassword) Then
           MsgBox "Leaving the Old Password textbox empty will cause " & _
             "an error unless you currently have no password", vbOKOnly
         Call ChangeUserPassword(CurrentUser(), "", Me!txtNewPassword)
       Else
         Call ChangeUserPassword(CurrentUser(), Me!txtOldPassword, _
           Me!txtNewPassword)
       End If
    End If
    
    Exit Sub
    
    CmdChange_err:
              MsgBox Err.Description
    End Sub
    
    Private Sub cmdChangeAdmin_Click()
    
    On Error GoTo CmdChangeAdmin_err
    
    ' Test to make sure appropriate text boxes are filled in because this
    ' is an administrative function.
    
    If Not IsNull(Me!txtAdminPassword) And Not _
      isNull(Me!txtAdminUsername) And Not IsNull(Me!txtUserName) Then
        If Me!txtNewPassword <> Me!txtVerifyPassword Then
           MsgBox "The New and Verified Passwords Do Not Match. Please" & _
             " Re-enter", vbCritical
           Me!txtNewPassword = ""
           Me!txtNewVerifyPassword = ""
           Me!txtNewPassword.SetFocus
    
       Else
           Call ChangeResetPassword("Change",Me!txtUserName, _
             me!txtAdminUsername, me!txtAdminPassword, Me!txtNewPassword)
       End If
    
    Else
    
     MsgBox "The textboxes for UserName, New Password, Verified " & _
        "Password, Admin UserName and Admin Password must be complete " & _
        "for this function to operate correctly.", vbOKOnly
     End If
    Exit Sub
    
    CmdChangeAdmin_err:
       MsgBox Err.Description
    
    End Sub
    
    Private Sub cmdReset_Click()
    
    On Error GoTo CmdReset_err
    
    ' Test to make sure appropriate textboxes are filled in because this is
    ' an administrative function.
    
    If Not IsNull(Me!txtAdminPassword) And Not _
      IsNull(Me!txtAdminUsername) And Not IsNull(Me!txtUserName) Then
      Call ChangeResetPassword("Reset", Me!txtUserName, _
      Me!txtAdminUsername, Me!txtAdminPassword)
    Else
      MsgBox "The textboxes for UserName, New Password, Verified " & _
        "Password, Admin UserName and Admin Password must be complete " & _
        "for this function to operate correctly.", VBOKOnly
    End If
    Exit Sub
    
    CmdReset_err:
      MsgBox Err.Description
    End Sub 
  8. Save your changes and close the Module window. Save and close the form.



REFERENCES

For more information about changing passwords programmatically, search the Help Index for "NewPassword Method."

Additional query words: pass word forget lost forgot

Keywords : PgmHowto
Version : WINDOWS:7.0,97
Platform : WINDOWS
Issue type : kbhowto


Last Reviewed: December 2, 1999
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