Script to allow only specific WIFI connections

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Release Time

08/20/2024

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Update Time

04/18/2025

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Security wireless network

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RUN AS LOCALSYSTEM USER

EDITABLE PARAMETERS:

SSID - provide the SSID in this list to only allow them on the system. eg: SSID = ["SSID_1", "SSID_2", "SSID_3"]
Change_or_reverse - Provide either "change" or "reverse" in this variable. If you choose "change", the script will allow only the provided SSIDs on the system and block all others. If you choose "reverse", the script will revert the changes. When reversing, you need to provide the allowed SSIDs in the list to undo the changes made to them.

this script has been scanned with virustotal.com and xcitium verdict cloud.

PYTHON SCRIPT FILE SHA1 VALUE - e71b5b428834251516a889930174c1d4a2f7df2b

JSON FILE SHA1 VALUE - 819f620bb319a776a7e7a00a1ca58ad43e88563f

Procedure's Instructions

SSID = ["SSID_1", "SSID_2", "SSID_3"]

Change_or_reverse = "change" # give change or reverse

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, success, error):
    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:
                print(out.strip())
            print(success)
        else:
            if err:
                print("an error occured: %s"%(err.strip()))
                print(error)
            else:
                print(error)
                print("return code: %s"%(ret))

def check(ID_list):
    with disable_file_system_redirection():
        filters = os.popen("netsh wlan show filters").read()
    
    allow_parse = filters.partition("Allow list on the system (user)")[-1].partition("Block list on the system (group policy)")[0]

NewID_list = []

for ID in ID_list:
        if not ID in allow_parse:
            NewID_list.append(ID)
        else:
            print("SSID: %s is already Allowed on this system"%(ID))
    
    deny_parse = filters.partition("Block list on the system (user)")[-1]
    flag = 0
    
    if 'SSID: "", Type: Infrastructure' in deny_parse:
        flag = 1
    
    return NewID_list, flag

IDs_to_allow, deny_flag = check(SSID)

def add_filters():
    IDs_to_allow, deny_flag = check(SSID)
    for ID in IDs_to_allow:
        allow_command = 'netsh wlan add filter permission=allow ssid="%s" networktype=infrastructure'%(ID)
        allow_success = "Successfully allowed the SSID: %s"%(ID)
        allow_error = "something went wrong while allowing the SSID: %s"%(ID)
        ecmd(allow_command, allow_success, allow_error)

deny_success = "Successfully denied permission for every single SSIDs except the allowed ones"
    deny_error = "Failed to deny permission for every single SSIDs except the allowed ones"
    if deny_flag == 0:
        deny_command = "netsh wlan add filter permission=denyall networktype=infrastructure"
        ecmd(deny_command, deny_success, deny_error)
    else:
        print("already denied permission for every single SSIDs except the allowed ones on this system")

def delete_filters():
    with disable_file_system_redirection():
        for ID in SSID:
            delete_command = 'netsh wlan delete filter permission=allow ssid="%s" networktype=infrastructure'%(ID)
            print(os.popen(delete_command).read())
        
        delete_deny_command = 'netsh wlan delete filter permission=denyall networktype=infrastructure'
        print(os.popen(delete_deny_command).read())

print("Successfully reversed the settings")

if Change_or_reverse.lower() == "change":
    add_filters()
elif Change_or_reverse.lower() == "reverse":
    delete_filters()
else:
    print("Please check the spelling in the Change_or_reverse variable")

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Script to allow only specific WIFI connections

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