# DON'T USE THIS VERSION!
# Try https://gist.github.com/wdormann/89ed779933fe205fb52ecf3eacf5ff40 instead

import os
import subprocess

# See: https://blogs.msmvps.com/erikr/2007/09/26/set-permissions-on-a-specific-service-windows/

svcinfo = {}
FNULL = open(os.devnull, 'w')
win10builtin = ['AppVClient', 'ClickToRunSvc', 'COMSysApp', 'diagnosticshub.standardcollector.service',
           'msiserver', 'ose', 'perceptionsimulation', 'SecurityHealthService', 'Sense',
           'SensorDataService', 'SgrmBroker', 'Spooler', 'ssh-agent', 'TieringEngineService',
           'TrustedInstaller', 'UevAgentService', 'vds', 'VSS', 'wbengine', 'WinDefend', 'wmiApSrv',
            'WSearch']


def sliceperms(permstring):
    permparts = []
    if permstring:
        parts = int(len(permstring))
        #        print('%s parts' % parts)
        for i in range(0, parts, 2):
            # print(permstring[i:i+2])
            permparts.append(permstring[i:i + 2])
    return permparts


def getsvcacls(svcname):
    svcacl = None
    try:
        svcacl = subprocess.check_output(['sc', 'sdshow', svcname], stderr=FNULL).decode('utf-8',
                                                                                         'backslashreplace').strip()
    except subprocess.CalledProcessError:
        pass
    return svcacl


def whichfile(file):
    if file:
        fullpath = ''
        try:
            fullpath = subprocess.check_output(['where', file, ], stderr=FNULL).decode('utf-8',
                                                                                       'backslashreplace').strip()
        except subprocess.CalledProcessError:
            pass
        return fullpath


def svchosttarget(svcname):
    parsed = ''
    svctarget = ''
    try:
        parsed = subprocess.check_output(['reg', 'query',
                                          r'HKLM\SYSTEM\CurrentControlSet\Services\%s\Parameters' %
                                          svcname], stderr=FNULL).decode('utf-8', 'backslashreplace')
    except subprocess.CalledProcessError:
        pass

    for line in parsed.splitlines():

        if ' servicedll ' in line.lower():
            lineparts = line.split('    REG_EXPAND_SZ    ')
            svctarget = os.path.expandvars((lineparts[-1]))

    if not os.path.exists(svctarget):
        svctarget = whichfile(svctarget)

    return svctarget


def checkservices():
    nameindex = None
    dispnameindex = None
    privindex = None
    stateindex = None
    pathindex = None
    startmodeindex = None
    parsed = subprocess.check_output(['wmic', 'service', 'get', 'name,startname,displayname,state,pathname,startmode,'
                                                                'DesktopInteract',
                                      '/format:csv'], stderr=FNULL).decode(
        'utf-8', 'backslashreplace')
    for line in parsed.splitlines():
        if line:
            columns = line.split(',')
            if line.startswith('Node,'):
                nameindex = columns.index('Name')
                dispnameindex = columns.index('DisplayName')
                privindex = columns.index('StartName')
                stateindex = columns.index('State')
                pathindex = columns.index('PathName')
                startmodeindex = columns.index('StartMode')
                desktopindex = columns.index('DesktopInteract')
            else:
                reasons = []
                svcname = columns[nameindex]
                svcdict = {}
                svcdict['priv'] = columns[privindex]
                svcdict['dispname'] = columns[dispnameindex]
                svcdict['state'] = columns[stateindex]
                svcdict['path'] = columns[pathindex]
                svcdict['startmode'] = columns[startmodeindex]
                svcdict['desktop'] = columns[desktopindex]
                if svcdict['desktop'].lower() == 'true':
                    svcdict['desktop'] = True
                else:
                    svcdict['desktop'] = False
                if 'svchost.exe' in svcdict['path']:
                    realtarget = svchosttarget(svcname)
                    if realtarget:
                        # print('%s uses svchost: %s' % (svcname,realtarget))
                        svcdict['path'] = realtarget
                elif '"' in svcdict['path']:
                    # Quoted path
                    splitpath = svcdict['path'].split('"')
                    if len(splitpath) > 2 and splitpath[2]:
                        # Quoted path with arguments
                        svcdict['path'] = '"%s"' % splitpath[1]
                    else:
                        # Quoted path without arguments
                        pass
                else:
                    # Non-quoted path
                    splitpath = svcdict['path'].split()
                    if len(splitpath) > 1:
                        # Non-quoted path with arguments
                        svcdict['path'] = splitpath[0]

                svcinfo[svcname] = svcdict
                
                if (svcdict['priv'].lower() == 'localsystem') and not svcdict[
                    'path'].endswith('lsass.exe') and svcdict['path'].lower().replace('"', '').endswith('.exe'):
                    reasons.append('User-controlled and high-privileged')

                reasons = ', '.join(reasons)

                if reasons and svcname not in win10builtin:
                    print('Service: %s' % svcname)
                    print('Display name: %s' % svcinfo[svcname]['dispname'])
                    print('Privilege: %s' % svcinfo[svcname]['priv'])
                    print('Path: %s' % svcinfo[svcname]['path'])
                    print('')

if __name__ == "__main__":
    checkservices()