<#
.SYNOPSIS
    Detection: Checks if Dell BIOS Admin password is set and matches current expected password.
    Uses the root\dcim\sysman\wmisecurity namespace.
#>

# === CONFIG ===
$NewPwdBlobUrl = "https://stitbiosmgmt.blob.core.windows.net/mgmt/current-content.txt?sp=r&st=2026-02-26T08:49:58Z&se=2034-01-08T17:04:58Z&spr=https&sv=2024-11-04&sr=c&sig=zS74OfiIR93eSpFz68xnqW99UF0pJPLCoUIB7X5rnnM%3D"

# --- Dell check ---
if ((Get-CimInstance -ClassName Win32_ComputerSystem).Manufacturer -notlike "*Dell*") { exit 0 }

# --- Fetch current expected password from Azure ---
try {
    $Base64NewPwd = (Invoke-RestMethod -Uri $NewPwdBlobUrl -Method Get).Trim()
    $NewPassword = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($Base64NewPwd))
} catch {
    Write-Output "Failed to fetch password from Azure."
    exit 1
}

# --- Check if Admin Password is set ---
try {
    $PwdObj = Get-CimInstance -Namespace "root\dcim\sysman\wmisecurity" -ClassName "PasswordObject" -ErrorAction Stop | 
              Where-Object { $_.NameId -eq "Admin" }
    
    if ($PwdObj.IsPasswordSet -ne 1) {
        Write-Output "Admin password is NOT set. Non-compliant."
        exit 1
    }
} catch {
    Write-Output "WMI Security namespace not found."
    exit 1
}

# --- Verify it matches the NEW password ---
# We use the SecurityInterface to attempt a "verify" (setting the password to itself)
try {
    $SecurityInterface = Get-WmiObject -Namespace "root\dcim\sysman\wmisecurity" -Class "SecurityInterface"
    $Encoder = New-Object System.Text.UTF8Encoding
    $PwdBytes = $Encoder.GetBytes($NewPassword)

    # SetNewPassword(IsChange, PwdLen, PwdBytes, PwdType, OldPwd, NewPwd)
    # PwdType: "Admin"
    $Result = $SecurityInterface.SetNewPassword(1, $PwdBytes.Length, $PwdBytes, "Admin", $NewPassword, $NewPassword)

    if ($Result.Status -eq 0) {
        Write-Output "Admin password matches current expected value. Compliant."
        exit 0
    } else {
        Write-Output "Admin password is set but does NOT match current expected value. Non-compliant."
        exit 1
    }
} catch {
    Write-Output "Verification call failed."
    exit 1
}