def check_target_is_user_by_name(self, user: str, domain: str) -> bool:
"""
检查目标账号是否为 OU=Users
"""
key = user + REDIS_KEY_USERNAME_IS_USERS_SUFFIX
record = self.redis.get_str_value(key)
# 存在redis缓存记录
if record:
if record == "true":
return True
else:
return False
# 不存在 则通过ldap查询，再更新redis缓存
else:
ldap = LDAPSearch(domain)
user_entry = ldap.search_by_name(user=user, attributes=["cn"])
if user_entry:
dn = str(user_entry.entry_dn)
if "OU=Users".lower() in dn.lower() or "CN=Users".lower(
) in dn.lower():
self.redis.set_str_value(
key, "true", expire=ACCOUNT_INFO_REDIS_EXPIRE_TIME)
return True
self.redis.set_str_value(key,
"false",
expire=ACCOUNT_INFO_REDIS_EXPIRE_TIME)
return False
def check_target_is_admin_by_sid(self, sid: str, domain: str) -> bool:
"""
检查一个账户是否拥有管理员权限
"""
key = sid + REDIS_KEY_SID_IS_ADMIN_SUFFIX
record = self.redis.get_str_value(key)
# 存在redis缓存记录
if record:
if record == "true":
return True
else:
return False
# 不存在 则通过ldap查询，再更新redis缓存
else:
ldap = LDAPSearch(domain)
user_entry = ldap.search_by_sid(sid=sid, attributes=["adminCount"])
if user_entry:
entry_attributes = user_entry.entry_attributes_as_dict
if len(entry_attributes["adminCount"]
) > 0 and entry_attributes["adminCount"][0] == 1:
self.redis.set_str_value(
key, "true", expire=ACCOUNT_INFO_REDIS_EXPIRE_TIME)
return True
self.redis.set_str_value(key,
"false",
expire=ACCOUNT_INFO_REDIS_EXPIRE_TIME)
return False
def check_target_is_user_by_sid(self, sid: str, domain: str) -> bool:
"""
检查目标账号是否为 OU=Users
"""
key = sid + REDIS_KEY_SID_IS_USERS_SUFFIX
record = self.redis.get_str_value(key)
# 存在redis缓存记录
if record:
if record == "true":
return True
else:
return False
# 不存在 则通过ldap查询，再更新redis缓存
else:
ldap = LDAPSearch(domain)
user_entry = ldap.search_by_sid(sid=sid, attributes=["cn"])
if user_entry:
dn = user_entry.entry_dn
if "OU=Users" in dn:
self.redis.set_str_value(
key, "true", expire=ACCOUNT_INFO_REDIS_EXPIRE_TIME)
return True
self.redis.set_str_value(key,
"false",
expire=ACCOUNT_INFO_REDIS_EXPIRE_TIME)
return False
def check_target_is_aes_support(self, name: str, domain: str) -> bool:
key = name + REDIS_KEY_USERNAME_AES_SUPPORT_SUFFIX
# 先查redis
is_support = self.redis.get_str_value(key)
#
if is_support is not None:
return is_support == "true"
else:
ldap = LDAPSearch(domain)
user_entry = ldap.search_by_name(
name, attributes=["msDS-SupportedEncryptionTypes"])
if not user_entry:
return False
support_types = user_entry.entry_attributes_as_dict[
"msDS-SupportedEncryptionTypes"]
if len(support_types) == 0:
return False
support_types = support_types[0]
# 等于8 支持AES128加密
if support_types >= 8:
self.redis.set_str_value(key, "true")
return True
else:
self.redis.set_str_value(key, "false")
return False
def init_sensitive_groups(domain):
logger.info("init sensitive groups.")
domain = get_netbios_domain(domain)
ldap_search = LDAPSearch(domain)
redis = RedisHelper()
mongo = MongoHelper(uri=MongoConfig.uri,
db=MongoConfig.db,
collection=MongoConfig.settings_collection)
sensitive_groups = []
for item in default_sensitive_groups(domain):
if len(item["sid"]) > 0:
sensitive_groups.append(item)
else:
entry = ldap_search.search_by_name(item["name"],
attributes=["objectSid"])
if not entry or len(
entry.entry_attributes_as_dict["objectSid"]) == 0:
continue
sid = entry.entry_attributes_as_dict["objectSid"][0]
item["sid"] = sid
sensitive_groups.append(item)
logger.info(",".join(list(map(lambda x: x["name"], sensitive_groups))))
sensitive_entry = mongo.find_one({"name": "sensitive_entry"})["value"]
sensitive_entry["group"] = sensitive_groups
mongo.update_one({"name": "sensitive_entry"},
{"$set": {
"value": sensitive_entry
}},
upsert=True)
redis.set_str_value("sensitive_entry" + REDIS_KEY_SUFFIX,
simplejson.dumps(sensitive_entry))
def user_is_sensitive_by_sid(self, sid: str, domain: str) -> bool:
"""
检查某个用户是否为敏感用户
1. adminCount 1
2. 属于敏感组
3. 蜜罐账户
4. 自定义敏感用户
LDAP查询是性能瓶颈，需要使用redis进行缓存加速
"""
# 蜜罐账户
for user in main_config.honeypot_account:
if user["sid"] == sid:
return True
# 自定义敏感用户
for user in main_config.sensitive_users:
if user["sid"] == sid:
return True
# 先查缓存
_cache_is_sensitive = self.get_target_sensitive_cache(sid)
if _cache_is_sensitive is not None:
return _cache_is_sensitive == "true"
# LDAP 查询较慢，性能瓶颈
ldap = LDAPSearch(domain)
user_entry = ldap.search_by_sid(sid,
attributes=["adminCount", "memberOf"])
if not user_entry:
self.set_target_sensitive_cache(sid, "false")
return False
# adminCount
if len(user_entry.entry_attributes_as_dict["adminCount"]) > 0 and \
user_entry.entry_attributes_as_dict["adminCount"][0] == 1:
self.set_target_sensitive_cache(sid, "true")
return True
# 敏感组
groups = user_entry.entry_attributes_as_dict["memberOf"]
sensitive_groups = list(
map(lambda x: x["name"], main_config.sensitive_groups))
for g in groups:
g_name = get_cn_from_dn(g)
if g_name in sensitive_groups:
self.set_target_sensitive_cache(sid, "true")
return True
self.set_target_sensitive_cache(sid, "false")
return False
def run(self, log: Log):
self.init(log=log)
if log.object_info.type != "SAM_USER":
return
user_name = log.subject_info.user_name
if user_name.endswith("$"):
return
target_sid = log.object_info.name
if not target_sid.startswith("S-1-5-21-"):
return
# 查询自身也忽略
if log.subject_info.user_sid == target_sid:
return
# 判断域名是否存在于需要检查的域名中
domain_name = log.subject_info.domain_name
if filter_domain(domain_name):
return
# 如果账号是管理员 直接忽略
if self.account_info.check_target_is_admin_by_sid(
sid=log.subject_info.user_sid, domain=domain_name):
return
# 判断操作者是否为Users
if not self.account_info.check_target_is_user_by_name(
user_name, domain_name):
return
# 判断是否为敏感用户
if not self.account_info.user_is_sensitive_by_sid(sid=target_sid,
domain=domain_name):
return
ldap = LDAPSearch(domain_name)
target = ldap.search_by_sid(target_sid, attributes=["cn"])
if not target:
return
target_user_name = str(target["cn"])
return self._generate_alert_doc(target_user_name=target_user_name)
def get_user_info_by_sid(self, sid: str, domain: str) -> User:
key = sid + REDIS_KEY_SID_USERNAME_SUFFIX
# 先查redis
user_name = self.redis.get_str_value(key)
if not user_name:
ldap = LDAPSearch(domain)
user_entry = ldap.search_by_sid(sid, attributes=["sAMAccountName"])
if not user_entry:
return None
user_name = user_entry.entry_attributes_as_dict["sAMAccountName"][
0]
self.redis.set_str_value(key,
user_name,
expire=ACCOUNT_INFO_REDIS_EXPIRE_TIME)
user = User({
"user_name": user_name,
"user_sid": sid,
"logon_id": "",
"domain_name": domain
})
return user
def get_all_unconstrained_delegation_users(domain: str):
"""
获取所有 无约束委派 权限的用户
"""
d = Delegation()
ldap_search = LDAPSearch(domain)
entries = ldap_search.search_unconstrained_accounts()
if entries:
for each in entries:
assert isinstance(each, Entry)
user = User({
"user_name":
each.entry_attributes_as_dict["sAMAccountName"][0],
"user_sid":
each.entry_attributes_as_dict["objectSid"][0],
"domain_name":
domain
})
d.new_delegation_record(user=user,
delegation_type=UNCONSTRAINED_DELEGATION)
def user_is_sensitive_by_sid(self, sid: str, domain: str) -> bool:
"""
检查某个用户是否为敏感用户
1. adminCount 1
2. 属于敏感组
3. 蜜罐账户
4. 自定义敏感用户
"""
# 蜜罐账户
for user in main_config.honeypot_account:
if user["sid"] == sid:
return True
# 自定义敏感用户
for user in main_config.sensitive_users:
if user["sid"] == sid:
return True
ldap = LDAPSearch(domain)
user_entry = ldap.search_by_sid(sid,
attributes=["adminCount", "memberOf"])
if not user_entry:
return False
# adminCount
if len(user_entry.entry_attributes_as_dict["adminCount"]) > 0 and \
user_entry.entry_attributes_as_dict["adminCount"][0] == 1:
return True
# 敏感组
groups = user_entry.entry_attributes_as_dict["memberOf"]
sensitive_groups = list(
map(lambda x: x["name"], main_config.sensitive_groups))
for g in groups:
g_name = get_cn_from_dn(g)
if g_name in sensitive_groups:
return True
return False
def get_user_info_by_name(self, user_name: str, domain: str) -> User:
key = user_name + REDIS_KEY_USERNAME_SID_SUFFIX
# 先查redis
user_sid = self.redis.get_str_value(key)
# redis 缓存未命中 再查mongo
if not user_sid:
ldap = LDAPSearch(domain)
user_entry = ldap.search_by_name(user_name,
attributes=["objectSid"])
if not user_entry:
return
user_sid = user_entry.entry_attributes_as_dict["objectSid"][0]
self.redis.set_str_value(key,
user_sid,
expire=ACCOUNT_INFO_REDIS_EXPIRE_TIME)
user = User({
"user_name": user_name,
"user_sid": user_sid,
"logon_id": "",
"domain_name": domain
})
return user
def get_all_dc_names(domain: str):
"""
将DC列表入库
"""
domain = get_netbios_domain(domain)
logger.info("Search all domain controllers using LDAP.")
dc_name_list = []
ldap_search = LDAPSearch(domain)
dc_list = ldap_search.search_domain_controller()
for each in dc_list:
dc_name = str(each["cn"])
dc_name_list.append(dc_name)
mongo = MongoHelper(MongoConfig.uri, MongoConfig.db,
MongoConfig.settings_collection)
doc = {domain: dc_name_list}
logger.info(",".join(dc_name_list))
logger.info(
"domain controller count: {count}".format(count=len(dc_name_list)))
logger.info("Save all domain controllers to settings.")
mongo.update_one({"name": "dc_name_list"}, {"$set": {"value": doc}}, True)
redis = RedisHelper()
redis.set_str_value("dc_name_list" + REDIS_KEY_SUFFIX,
simplejson.dumps(doc))
def _get_group_name(self, sid, domain):
ldap = LDAPSearch(domain)
entry = ldap.search_by_sid(sid, attributes=["cn"])
if entry:
return str(entry["cn"])
def run(self, log: Log):
self.init(log=log)
if log.event_data[
"AttributeLDAPDisplayName"] != "msDS-AllowedToActOnBehalfOfOtherIdentity":
return
# 只检测敏感计算机
account = get_cn_from_dn(log.object_info.dn)
domain = get_domain_from_dn(log.object_info.dn)
if not self.account_info.computer_is_sensitive_by_name(
account, domain=get_netbios_domain(domain)):
return
ldap = LDAPSearch(domain=domain)
entry = ldap.search_by_cn(
cn=account,
attributes=["sid", "msDS-AllowedToActOnBehalfOfOtherIdentity"])
if entry is None:
return
entry_sid = str(entry["sid"])
sd = SR_SECURITY_DESCRIPTOR(entry.entry_attributes_as_dict[
"msDS-AllowedToActOnBehalfOfOtherIdentity"][0])
# 拥有特殊DACL权限的SID列表
ace_list = []
for ace in sd["Dacl"].aces:
ace_list.append({
"type_name": ace["TypeName"],
"sid": ace['Ace']['Sid'].formatCanonical()
})
sid_list = list(map(lambda ace: ace["sid"], ace_list))
sid_list = sorted(list(set(sid_list)))
target_account_info = User({
"user_name": account,
"user_sid": entry_sid
})
# 查询历史委派记录
record = self.delegation.find_res_constrained_delegation_by_name(
name=account)
# 不存在记录 则新建 并直接告警
if not record:
self.delegation.new_delegation_record(
user=target_account_info,
delegation_type=RES_BASED_CONSTRAINED_DELEGATION,
allowed_to=sid_list)
return self._generate_alert_doc(
target_computer=account,
target_user_name=target_account_info.user_name,
target_user_sid=target_account_info.user_sid,
add_allowed_sid=sid_list,
old_allowed_sid=[])
# 存在记录且不变，退出
if sid_list == record["allowed_to"]:
return
# 存在记录 对比历史的sid 无新增 更新记录 退出
new_sids = self._get_new_sid(new_list=sid_list,
old_list=record["allowed_to"])
if len(new_sids) == 0:
self.delegation.update_delegation(
sid=entry_sid,
delegation_type=RES_BASED_CONSTRAINED_DELEGATION,
allowed_to=sid_list)
return
# 存在记录 有新增 更新记录 告警
if len(new_sids) > 0:
self.delegation.update_delegation(
sid=entry_sid,
delegation_type=RES_BASED_CONSTRAINED_DELEGATION,
allowed_to=sid_list)
return self._generate_alert_doc(
target_computer=account,
target_user_name=target_account_info.user_name,
target_user_sid=target_account_info.user_sid,
add_allowed_sid=new_sids,
old_allowed_sid=record["allowed_to"])
def _get_support_aes_account(self, domain):
ldap = LDAPSearch(domain)
entry = ldap.get_support_aes_account()
if entry:
return str(entry["sAMAccountName"])
