From 10e6415b72579175370a137f0493042c478b07bd Mon Sep 17 00:00:00 2001
From: dabruh <11458706-dabruh@users.noreply.gitlab.com>
Date: Sun, 5 Jun 2022 02:48:59 +0200
Subject: [PATCH] First POC.

---
 powershell/BankIDClipboardWatcher.ps1 | 39 ---------------------------
 powershell/BankIDTokenFileWatcher.ps1 | 37 +++++++++++++++++++++++++
 2 files changed, 37 insertions(+), 39 deletions(-)
 delete mode 100644 powershell/BankIDClipboardWatcher.ps1
 create mode 100644 powershell/BankIDTokenFileWatcher.ps1

diff --git a/powershell/BankIDClipboardWatcher.ps1 b/powershell/BankIDClipboardWatcher.ps1
deleted file mode 100644
index 4be48e8..0000000
--- a/powershell/BankIDClipboardWatcher.ps1
+++ /dev/null
@@ -1,39 +0,0 @@
-function Get-Hash([string]$textToHash) {
-    $hasher = new-object System.Security.Cryptography.MD5CryptoServiceProvider
-    $toHash = [System.Text.Encoding]::UTF8.GetBytes($textToHash)
-    $hashByteArray = $hasher.ComputeHash($toHash)
-
-    foreach($byte in $hashByteArray){
-        $result += "{0:X2}" -f $byte
-    }
-
-    return $result;
-}
-
-$ClearClipboard = $true
-$PreviousHash = Get-Hash(Get-Clipboard)
-
-while ($true) {
-    $Clipboard = Get-Clipboard
-    $ClipboardHash = Get-Hash($Clipboard)
-
-    if ($ClipboardHash -eq $PreviousHash) {
-        Write-Host "NOCHG"
-        Start-Sleep -Milliseconds 250
-        Continue
-    }
-    elseif ($Clipboard -match '^bankid:\/\/\/') {
-        Write-Host $Clipboard
-        start "$Clipboard"
-    }
-    else {
-        Write-Host "CHG"
-    }
-
-    if ($ClearClipboard) {
-        Set-Clipboard -Value $null
-    }
-
-    $PreviousHash = Get-Hash($Clipboard)
-    Start-Sleep -Milliseconds 250
-}
diff --git a/powershell/BankIDTokenFileWatcher.ps1 b/powershell/BankIDTokenFileWatcher.ps1
new file mode 100644
index 0000000..d84a664
--- /dev/null
+++ b/powershell/BankIDTokenFileWatcher.ps1
@@ -0,0 +1,37 @@
+#
+# BankIDTokenFileWatcher
+#
+# Starts BankID when a token is written to $TokenFile.
+#
+# Run this script on logon together with BankID. This script is intended to be
+# used with an SSH server installed on the host so that a client can write this
+# token to disk.
+#
+
+$Token = $null
+$LastToken = $null
+$TokenFile = "C:\bid_autostarttoken"
+
+Write-Host "Starting file watcher for '$TokenFile'"
+
+while ($true) {
+    if (Test-Path $TokenFile) {
+        $TokenFileData = Get-Item "$TokenFile"
+
+        if (((Get-Date) - $TokenFileData.LastWriteTime).totalseconds -le 1){
+            Write-Host "File modified: $TokenFile"
+            $Token = Get-Content "$TokenFile"
+
+            if ($Token -ne $LastToken) {
+                Write-Host "New token: $Token"
+                Start-Process "bankid:///?autostarttoken=$Token&redirect=null"
+                Start-Sleep -Milliseconds 500
+                $LastToken = $Token
+            }
+            else {
+                Write-Host "Token unchanged: $Token"
+            }
+        }
+    }
+    Start-Sleep -Milliseconds 500
+}