Client drive mapping
Supported on: All Citrix Workspace supported platforms
Description
Use this policy to enable and restrict the remote application or desktop's access to the client file systems. When enabled, the client will completely deny client drive mapping (CDM) virtual channel access to the client's file system if the check box "Enable client drive mapping" is not selected. This stops the DLL implementing the client drive mapping virtual channel (vdcdmn.dll) from loading on client start up. At this point, you can delete the DLL from the client package. If CDM is enabled, further options are available to restrict the type of access available to the server. If the "Read-only client drives" check box is selected, the CDM virtual channel only permits read access to client drives. Access to Windows drives can be disabled by entering the relevant drive letter in the "Do not map drives" box. This is a concatenation of all drives that should not be mapped when connecting to a published application or desktop, for example "ABFK" disables the drives A, B, F and K. Troubleshooting: These policies override selections made by users in the File Security dialog boxes of the Desktop Viewer. For information on how to prevent users from changing selections in the Client Connection Center, see the Citrix Knowledge Center.
Registry
Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Drives REG Builder
BETAConfigure the state and elements to generate .reg, PowerShell, Intune, and SCCM outputs.
These exports replicate the policy's registry effect. Editing the registry directly is not the same as applying the GPO through the management console (no gpupdate, no central reporting). Test before production; HKLM changes require administrator rights.
.reg file
Windows Registry Editor Version 5.00
; Exported from gporais.com
; Policy: Client drive mapping
; State: Enabled
; Supported on: All Citrix Workspace supported platforms
[HKEY_CURRENT_USER\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Drives]
"CDMAllowed"=dword:00000001
"CDMReadOnly"=dword:00000000
"DisableDrives"=""PowerShell
# Exported from gporais.com
# Policy: Client drive mapping
# State: Enabled
# Supported on: All Citrix Workspace supported platforms
$path = 'HKCU:\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Drives'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'CDMAllowed' -Value 1 -Type DWord
Set-ItemProperty -Path $path -Name 'CDMReadOnly' -Value 0 -Type DWord
Set-ItemProperty -Path $path -Name 'DisableDrives' -Value '' -Type StringIntune XML
No direct Policy CSP / OMA-URI mapping for this policy. Use the Intune Remediation tab, or ingest the ADMX in Intune.Intune Remediation
# === Detection script ===
# Exported from gporais.com
# Policy: Client drive mapping
# State: Enabled
# Supported on: All Citrix Workspace supported platforms
function Test-RegistryValue {
param(
[Parameter(Mandatory = $true)][string]$Path,
[Parameter(Mandatory = $true)][string]$Name,
[object]$Expected,
[ValidateSet('String', 'DWord', 'MultiString')][string]$Kind = 'String',
[switch]$Absent
)
try {
$item = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction Stop
} catch {
return $Absent.IsPresent
}
if ($Absent.IsPresent) { return $false }
$actual = $item.$Name
if ($Kind -eq 'DWord') { return ([int64]$actual) -eq ([int64]$Expected) }
if ($Kind -eq 'MultiString') {
$actualValues = @($actual)
$expectedValues = @($Expected)
if ($actualValues.Count -ne $expectedValues.Count) { return $false }
for ($i = 0; $i -lt $expectedValues.Count; $i++) {
if ([string]$actualValues[$i] -ne [string]$expectedValues[$i]) { return $false }
}
return $true
}
return [string]$actual -eq [string]$Expected
}
$checks = @(
(Test-RegistryValue -Path 'HKCU:\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Drives' -Name 'CDMAllowed' -Expected 1 -Kind DWord)
(Test-RegistryValue -Path 'HKCU:\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Drives' -Name 'CDMReadOnly' -Expected 0 -Kind DWord)
(Test-RegistryValue -Path 'HKCU:\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Drives' -Name 'DisableDrives' -Expected '' -Kind String)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Client drive mapping
# State: Enabled
# Supported on: All Citrix Workspace supported platforms
$path = 'HKCU:\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Drives'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'CDMAllowed' -Value 1 -Type DWord
Set-ItemProperty -Path $path -Name 'CDMReadOnly' -Value 0 -Type DWord
Set-ItemProperty -Path $path -Name 'DisableDrives' -Value '' -Type StringSCCM CI
# Exported from gporais.com
# Policy: Client drive mapping
# State: Enabled
# Supported on: All Citrix Workspace supported platforms
# SCCM Configuration Item guidance:
# Create a Configuration Item of type "Setting: Script".
# Discovery script: use the Detection script below.
# Remediation script: use the Remediation script below.
# Compliance rule: the Discovery script output equals 'Compliant'.
# === Detection script ===
# Exported from gporais.com
# Policy: Client drive mapping
# State: Enabled
# Supported on: All Citrix Workspace supported platforms
function Test-RegistryValue {
param(
[Parameter(Mandatory = $true)][string]$Path,
[Parameter(Mandatory = $true)][string]$Name,
[object]$Expected,
[ValidateSet('String', 'DWord', 'MultiString')][string]$Kind = 'String',
[switch]$Absent
)
try {
$item = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction Stop
} catch {
return $Absent.IsPresent
}
if ($Absent.IsPresent) { return $false }
$actual = $item.$Name
if ($Kind -eq 'DWord') { return ([int64]$actual) -eq ([int64]$Expected) }
if ($Kind -eq 'MultiString') {
$actualValues = @($actual)
$expectedValues = @($Expected)
if ($actualValues.Count -ne $expectedValues.Count) { return $false }
for ($i = 0; $i -lt $expectedValues.Count; $i++) {
if ([string]$actualValues[$i] -ne [string]$expectedValues[$i]) { return $false }
}
return $true
}
return [string]$actual -eq [string]$Expected
}
$checks = @(
(Test-RegistryValue -Path 'HKCU:\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Drives' -Name 'CDMAllowed' -Expected 1 -Kind DWord)
(Test-RegistryValue -Path 'HKCU:\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Drives' -Name 'CDMReadOnly' -Expected 0 -Kind DWord)
(Test-RegistryValue -Path 'HKCU:\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Drives' -Name 'DisableDrives' -Expected '' -Kind String)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Client drive mapping
# State: Enabled
# Supported on: All Citrix Workspace supported platforms
$path = 'HKCU:\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Drives'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'CDMAllowed' -Value 1 -Type DWord
Set-ItemProperty -Path $path -Name 'CDMReadOnly' -Value 0 -Type DWord
Set-ItemProperty -Path $path -Name 'DisableDrives' -Value '' -Type String