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Get-DecryptedObject.ps1
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Get-DecryptedObject.ps1
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function Get-DecryptedObject {
<#
.SYNOPSIS
Internal function.
This function is heavily based on Antti Rantasaari's script at http://goo.gl/wpqSib
Antti Rantasaari 2014, NetSPI
License: BSD 3-Clause http://opensource.org/licenses/BSD-3-Clause
#>
param (
[Parameter(Mandatory)]
[Microsoft.SqlServer.Management.Smo.Server]$SqlInstance,
[Parameter(Mandatory)]
[ValidateSet("LinkedServer", "Credential")]
[string]$Type,
[switch]$EnableException
)
$server = $SqlInstance
$sourceName = $server.Name
# Query Service Master Key from the database - remove padding from the key
# key_id 102 eq service master key, thumbprint 3 means encrypted with machinekey
Write-Message -Level Verbose -Message "Querying service master key"
$sql = "SELECT substring(crypt_property,9,len(crypt_property)-8) as smk FROM sys.key_encryptions WHERE key_id=102 and (thumbprint=0x03 or thumbprint=0x0300000001)"
try {
$smkbytes = $server.Query($sql).smk
} catch {
Stop-Function -Message "Can't execute query on $sourcename" -Target $server -ErrorRecord $_
return
}
$sourceNetBios = Resolve-NetBiosName $server
$instance = $server.InstanceName
$serviceInstanceId = $server.ServiceInstanceId
Write-Message -Level Verbose -Message "Get entropy from the registry - hopefully finds the right SQL server instance"
try {
[byte[]]$entropy = Invoke-Command2 -Raw -Credential $Credential -ComputerName $sourceNetBios -argumentlist $serviceInstanceId {
$serviceInstanceId = $args[0]
$entropy = (Get-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Microsoft SQL Server\$serviceInstanceId\Security\" -ErrorAction Stop).Entropy
return $entropy
}
} catch {
Stop-Function -Message "Can't access registry keys on $sourceName. Do you have administrative access to the Windows registry on $SqlInstance Otherwise, we're out of ideas." -Target $source
return
}
Write-Message -Level Verbose -Message "Decrypt the service master key"
try {
$serviceKey = Invoke-Command2 -Raw -Credential $Credential -ComputerName $sourceNetBios -ArgumentList $smkbytes, $Entropy {
Add-Type -AssemblyName System.Security
Add-Type -AssemblyName System.Core
$smkbytes = $args[0]; $Entropy = $args[1]
$serviceKey = [System.Security.Cryptography.ProtectedData]::Unprotect($smkbytes, $Entropy, 'LocalMachine')
return $serviceKey
}
} catch {
Stop-Function -Message "Can't unprotect registry data on $sourcename. Do you have administrative access to the Windows registry on $sourcename? Otherwise, we're out of ideas." -Target $source
return
}
# Choose the encryption algorithm based on the SMK length - 3DES for 2008, AES for 2012
# Choose IV length based on the algorithm
Write-Message -Level Verbose -Message "Choose the encryption algorithm based on the SMK length - 3DES for 2008, AES for 2012"
if (($serviceKey.Length -ne 16) -and ($serviceKey.Length -ne 32)) {
Write-Message -Level Verbose -Message "ServiceKey found: $serviceKey.Length"
Stop-Function -Message "Unknown key size. Do you have administrative access to the Windows registry on $sourcename? Otherwise, we're out of ideas." -Target $source
return
}
if ($serviceKey.Length -eq 16) {
$decryptor = New-Object System.Security.Cryptography.TripleDESCryptoServiceProvider
$ivlen = 8
} elseif ($serviceKey.Length -eq 32) {
$decryptor = New-Object System.Security.Cryptography.AESCryptoServiceProvider
$ivlen = 16
}
<#
Query link server password information from the Db.
Remove header from pwdhash, extract IV (as iv) and ciphertext (as pass)
Ignore links with blank credentials (integrated auth ?)
#>
Write-Message -Level Verbose -Message "Query link server password information from the Db."
try {
if (-not $server.IsClustered) {
$connString = "Server=ADMIN:$sourceNetBios\$instance;Trusted_Connection=True;Pooling=false"
} else {
$dacEnabled = $server.Configuration.RemoteDacConnectionsEnabled.ConfigValue
if ($dacEnabled -eq $false) {
If ($Pscmdlet.ShouldProcess($server.Name, "Enabling DAC on clustered instance.")) {
Write-Message -Level Verbose -Message "DAC must be enabled for clusters, even when accessed from active node. Enabling."
$server.Configuration.RemoteDacConnectionsEnabled.ConfigValue = $true
$server.Configuration.Alter()
}
}
$connString = "Server=ADMIN:$sourceName;Trusted_Connection=True;Pooling=false;"
}
} catch {
Stop-Function -Message "Failure enabling DAC on $sourcename" -Target $source -ErrorRecord $_
}
<# NOTE: This query is accessing syslnklgns table. Can only be done via the DAC connection #>
$sql = switch ($Type) {
"LinkedServer" {
"SELECT sysservers.srvname,
syslnklgns.name,
substring(syslnklgns.pwdhash,5,$ivlen) iv,
substring(syslnklgns.pwdhash,$($ivlen + 5),
len(syslnklgns.pwdhash)-$($ivlen + 4)) pass
FROM master.sys.syslnklgns
inner join master.sys.sysservers
on syslnklgns.srvid=sysservers.srvid
WHERE len(pwdhash) > 0"
}
"Credential" {
"SELECT QUOTENAME(name) AS name,credential_identity,substring(imageval,5,$ivlen) iv, substring(imageval,$($ivlen + 5),len(imageval)-$($ivlen + 4)) pass from sys.credentials cred inner join sys.sysobjvalues obj on cred.credential_id = obj.objid where valclass=28 and valnum=2"
}
}
Write-Message -Level Debug -Message $sql
try {
$results = Invoke-Command2 -ErrorAction Stop -Raw -Credential $Credential -ComputerName $sourceNetBios -ArgumentList $connString, $sql {
$connString = $args[0]
$sql = $args[1]
$conn = New-Object System.Data.SqlClient.SQLConnection($connString)
$cmd = New-Object System.Data.SqlClient.SqlCommand($sql, $conn)
$dt = New-Object System.Data.DataTable
$conn.open()
$dt.Load($cmd.ExecuteReader())
$conn.Close()
$conn.Dispose()
return $dt
}
} catch {
try {
$conn.Close()
$conn.Dispose()
} catch {
$null = 1
}
Stop-Function -Message "Can't establish local DAC connection on $sourcename." -Target $server -ErrorRecord $_
return
}
if ($server.IsClustered -and $dacEnabled -eq $false) {
If ($Pscmdlet.ShouldProcess($server.Name, "Disabling DAC on clustered instance.")) {
try {
Write-Message -Level Verbose -Message "Setting DAC config back to 0."
$server.Configuration.RemoteDacConnectionsEnabled.ConfigValue = $false
$server.Configuration.Alter()
} catch {
Stop-Function -Message "Can't establish local DAC connection on $sourcename" -Target $server -ErrorRecord $_
return
}
}
}
Write-Message -Level Verbose -Message "Go through each row in results"
foreach ($result in $results) {
# decrypt the password using the service master key and the extracted IV
$decryptor.Padding = "None"
$decrypt = $decryptor.Createdecryptor($serviceKey, $result.iv)
$stream = New-Object System.IO.MemoryStream ( , $result.pass)
$crypto = New-Object System.Security.Cryptography.CryptoStream $stream, $decrypt, "Write"
$crypto.Write($result.pass, 0, $result.pass.Length)
[byte[]]$decrypted = $stream.ToArray()
# convert decrypted password to unicode
$encode = New-Object System.Text.UnicodeEncoding
# Print results - removing the weird padding (8 bytes in the front, some bytes at the end)...
# Might cause problems but so far seems to work.. may be dependant on SQL server version...
# If problems arise remove the next three lines..
$i = 8; foreach ($b in $decrypted) { if ($decrypted[$i] -ne 0 -and $decrypted[$i + 1] -ne 0 -or $i -eq $decrypted.Length) { $i -= 1; break; }; $i += 1; }
$decrypted = $decrypted[8 .. $i]
if ($Type -eq "LinkedServer") {
$name = $result.srvname
$identity = $result.Name
} else {
$name = $result.name
$identity = $result.credential_identity
}
[pscustomobject]@{
Name = $name
Identity = $identity
Password = $encode.GetString($decrypted)
}
}
}