Hide password changes for managed SGU users

scripts/Set-SguDomainUserPolicies.ps1

@@ -10,6 +10,7 @@ param(
 $ErrorActionPreference = 'Stop'
 $policyKey = 'HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System'
 $policyValueName = 'DisableLockWorkstation'
+$disableChangePasswordValueName = 'DisableChangePassword'
 $desktopPolicyKey = 'HKCU\Software\Policies\Microsoft\Windows\Control Panel\Desktop'
 $themeKey = 'HKCU\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize'
 
@@ -76,6 +77,17 @@ if ($PSCmdlet.ShouldProcess($GpoName, 'Prevent SGU users from manually locking w
         -Type DWord `
         -Value 1 | Out-Null
 
+    # The directory ACL remains the security boundary. This user policy also
+    # removes the unusable Change a password action from Ctrl+Alt+Delete.
+    Set-GPRegistryValue `
+        -Name $GpoName `
+        -Domain $domainName `
+        -Server $DomainController `
+        -Key $policyKey `
+        -ValueName $disableChangePasswordValueName `
+        -Type DWord `
+        -Value 1 | Out-Null
+
     Set-GPRegistryValue `
         -Name $GpoName `
         -Domain $domainName `
@@ -135,6 +147,12 @@ $configuredValue = Get-GPRegistryValue `
     -Server $DomainController `
     -Key $policyKey `
     -ValueName $policyValueName
+$disableChangePasswordValue = Get-GPRegistryValue `
+    -Name $GpoName `
+    -Domain $domainName `
+    -Server $DomainController `
+    -Key $policyKey `
+    -ValueName $disableChangePasswordValueName
 $screenSaverValue = Get-GPRegistryValue `
     -Name $GpoName `
     -Domain $domainName `
@@ -175,6 +193,7 @@ if ($WallpaperPath) {
     TargetOu = $TargetOuDn
     LinkEnabled = [bool]$linkEnabled
     DisableLockWorkstation = [int]$configuredValue.Value
+    DisableChangePassword = [int]$disableChangePasswordValue.Value
     ScreenSaverDisabled = [string]$screenSaverValue.Value -eq '0'
     DarkMode = ([int]$appsThemeValue.Value -eq 0) -and ([int]$systemThemeValue.Value -eq 0)
     Wallpaper = $configuredWallpaper