script to block a chrome extension

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Release Time

10/21/2022

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Update Time

11/19/2024

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RUN AS LOCALSYSTEM USER.

GIVE THE EXTENSION ID THAT YOU WISH TO BLOCK IN THE VARIABLE ExtensionId.

THIS SCRIPT WILL BLOCK THE GIVEN EXTENSION FROM INSTALLING AS WELL AS BLOCKS THE EXTENSION IF IT ALREADY INSTALLED.

Procedure's Instructions

ExtensionId = r"bcjindcccaagfpapjjmafdapmmgkkhgoa" # give here the ExtensionId to block. make sure to give correct extension without any mistake in it. FOR EXAMPLE: ExtensionEd = r"nmshkrehccagdldgiiewthgdfsmiedf"

import os
from subprocess import PIPE, Popen
import ctypes

class disable_file_system_redirection:
    _disable = ctypes.windll.kernel32.Wow64DisableWow64FsRedirection
    _revert = ctypes.windll.kernel32.Wow64RevertWow64FsRedirection
    def __enter__(self):
        self.old_value = ctypes.c_long()
        self.success = self._disable(ctypes.byref(self.old_value))
    def __exit__(self, type, value, traceback):
        if self.success:
            self._revert(self.old_value)

def ecmd(command):   
    from subprocess import Popen, PIPE
    import ctypes
    
    with disable_file_system_redirection():
        obj = Popen(command, shell = True, stdout = PIPE, stderr = PIPE)
    out, err = obj.communicate()
    ret=obj.returncode
    if ret==0:
        if out:
            return out.strip()
        else:
            return ret
    else:
        if err:
            return err.strip()
        else:
            return ret

ps_content = """
$extensionId = "%s"
if(!($extensionId)){
    # Empty Extension
    $result = "No Extension ID"
}
else{
    Write-Information "ExtensionID = $extensionID"
    $regKey = "HKLM:\SOFTWARE\Policies\Google\Chrome\ExtensionInstallBlocklist"
    $regKeyInstall = "HKLM:\SOFTWARE\Policies\Google\Chrome\ExtensionInstallForcelist"
    if(!(Test-Path $regKey)){
        New-Item $regKey -Force
        Write-Information "Created Reg Key $regKey"
    }
    # Remove Extension from Chrome
    $extensionsList = New-Object System.Collections.ArrayList
    $number = 0
    $noMore = 0
    do{
        $number++
        Write-Information "Pass : $number"
        try{
            $install = Get-ItemProperty $regKey -name $number -ErrorAction Stop
            $extensionObj = [PSCustomObject]@{
                Name = $number
                Value = $install.$number
            }
            $extensionsList.add($extensionObj) | Out-Null
            Write-Information "Extension List Item : $($extensionObj.name) / $($extensionObj.value)"
        }
        catch{
            $noMore = 1
        }
    }
    until($noMore -eq 1)
    $extensionCheck = $extensionsList | Where-Object {$_.Value -eq $extensionId}
    if($extensionCheck){
        $result = "Extension Already Blocked"
        Write-Information "Extension Already Blocked"
    }else{
        $newExtensionId = $extensionsList[-1].name + 1
        New-ItemProperty $regKey -PropertyType String -Name $newExtensionId -Value $extensionId
        $result = "the extenstion has been blocked in this system"
    }
    # Remove From Install List
    if (!(Test-Path $regKeyInstall)) {
        New-Item $regKeyInstall -Force
        Write-Information "Created Reg Key $regKeyInstall"
    }
    # Remove Extension from Chrome
    $extensionId = $extensionId, ";https://clients2.google.com/service/update2/crx" -join ""
    $extensionsInstallList = New-Object System.Collections.ArrayList
    $number = 0
    $noMore = 0
    do {
        $number++
        Write-Information "Pass : $number"
        try {
            $install = Get-ItemProperty $regKeyInstall -name $number -ErrorAction Stop
            $extensionObj = [PSCustomObject]@{
                Name  = $number
                Value = $install.$number
            }
            $extensionsInstallList.add($extensionObj) | Out-Null
            Write-Information "Extension List Item : $($extensionObj.name) / $($extensionObj.value)"
        }
        catch {
            $noMore = 1
        }
    }
    until($noMore -eq 1)
    $extensionCheck = $extensionsInstallList | Where-Object { $_.Value -eq $extensionId }
    if ($extensionCheck) {
        $result = "Extension Installed - Removing"
        Remove-ItemProperty $regKeyInstall -Name $extensionCheck.name -Force
    }
}
$result
"""%(ExtensionId)

with disable_file_system_redirection():        
    ps_name='powershell_file.ps1'
    ps_path=os.path.join(os.environ['TEMP'], ps_name)
    with open(ps_path, 'wb') as wr:
        wr.write(ps_content)

ecmd('powershell "Set-ExecutionPolicy RemoteSigned"')
    print(ecmd('powershell "%s"'%ps_path))
    os.remove(ps_path)

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script to block a chrome extension

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