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banner_map_module.py
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banner_map_module.py
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from bcc import BPF
import logging
from ctypes import Structure, c_uint64, c_bool
import time
import ipaddress
from associated_module import BanList
import threading
class BannedIpInfo(Structure):
_fields_ = [
("timestamp", c_uint64),
("access_times", c_uint64)
]
class BannedCidrInfo(Structure):
_fields_ = [
("init_time", c_uint64),
("timeout_time", c_uint64),
# 0 为暂时，1 为永久
("type", c_bool),
# 0 为失效，1 为有效
("status", c_bool)
]
class BannedIpXdpMap(object):
"""
Used to modify mirrors_banner xdp map
"""
def __init__(self, v4_banned_list_location: str , v6_banned_list_location: str ,
v4_banned_list_persistence_location , v6_banned_list_persistence_location,
sync_time: int, auto_remove_enabled: bool):
# Get file location
self.v4_banned_ip_list_location = v4_banned_list_location
self.v4_banned_ip_list_persistence_location = v4_banned_list_persistence_location
self.v6_banned_ip_list_location = v6_banned_list_location
self.v6_banned_ip_list_persistence_location = v6_banned_list_persistence_location
if not isinstance(auto_remove_enabled,bool):
raise ValueError("auto_remove_enabled should be bool!")
self.auto_remove_enabled = auto_remove_enabled
if sync_time < 30:
raise ValueError("sync_time should larger than 30s for security!")
self.sync_time = sync_time
# Load ips in file to ebpf map
bpf_map_file = BPF(src_file="./map_creator.c")
self.ipv4_cidr_map = bpf_map_file.get_table("banned_ipv4_cidr_map")
self.ipv6_cidr_map = bpf_map_file.get_table("banned_ipv6_cidr_map")
self.ipv4_access_map = bpf_map_file.get_table("banned_ipv4_ip_map")
self.ipv6_access_map = bpf_map_file.get_table("banned_ipv6_ip_map")
# Enable auto load
self.banlist_v4 = BanList(self.v4_banned_ip_list_location, self.v4_banned_ip_list_persistence_location, protocol= 4)
self.banlist_v6 = BanList(self.v6_banned_ip_list_location, self.v6_banned_ip_list_persistence_location, protocol= 6)
self.load_banned_list_file()
# Start a sync Thread
thread = threading.Thread(target=self.banlist_sync)
thread.daemon = True
thread.start()
def load_banned_list_file(self):
"""
Banned ips should be one ip per line
"""
# Load V4 ips
if self.v4_banned_ip_list_location:
# Clear maps
self.banlist_v4.full_reload_banlist()
self.ipv4_cidr_map.clear()
for cidr in self.banlist_v4.cidr_list:
self.ipv4_cidr_map[self.banlist_v4.cidr_map[cidr]] = self.banlist_v4.element_map[cidr]
# Load V6 ips
if self.v6_banned_ip_list_location:
# Clear maps
self.banlist_v6.full_reload_banlist()
self.ipv6_cidr_map.clear()
for cidr, cidr_info in self.banlist_v6.element_map.items():
self.ipv6_cidr_map[self.banlist_v6.cidr_map[cidr]] = self.banlist_v6.element_map[cidr]
def add_ip_to_ban_list_with_cidr(self, cidr, is_cidr_permanently_banned: int, ban_time: int = 0):
"""
This function add cidr to bpf map
Args:
cidr (str): The cidr which will be added.
is_cidr_permanently_banned (int): Just as the name, 0 is temporarily, 1 is permanently
ban_time (int, optional): If choose temporarily banned, set this to the time(s) you prefer
Returns:
int: 1 if cidr exists, 0 if success, -1 if error
"""
try:
network = ipaddress.ip_network(cidr, strict=False)
result = -1
if network.version == 4:
result = self.banlist_v4.update_cidr(cidr, is_cidr_permanently_banned, ban_time)
if result != -1:
self.ipv4_cidr_map[self.banlist_v4.cidr_map[cidr]] = self.banlist_v4.element_map[cidr]
logging.info(f"CIDR: {cidr} have have been added")
# if ipv6
if network.version == 6:
result = self.banlist_v6.update_cidr(cidr, is_cidr_permanently_banned, ban_time)
if result != -1:
self.ipv6_cidr_map[self.banlist_v6.cidr_map[cidr]] = self.banlist_v6.element_map[cidr]
logging.info(f"CIDR: {cidr} have have been added")
if result == 1:
logging.info(f"CIDR: {cidr} have have been updated for it has been existed")
return result
except Exception as e:
logging.error(f"Failed to add CIDR: {cidr} to Map due to {e}")
return -1
def remove_ip_from_ban_list_with_cidr(self, cidr):
try:
network = ipaddress.ip_network(cidr, strict=False)
result = -1
if network.version == 4:
result = self.banlist_v4.check_cidr(cidr)
if result == 0:
cidr_struct = self.banlist_v4.cidr_map[cidr]
result = self.banlist_v4.remove_cidr(cidr)
self.ipv4_cidr_map.pop(cidr_struct)
logging.info(f"CIDR: {cidr} have have been removed")
# if ipv6
if network.version == 6:
result = self.banlist_v6.check_cidr(cidr)
if result == 0:
cidr_struct = self.banlist_v6.cidr_map[cidr]
result = self.banlist_v6.remove_cidr(cidr)
self.ipv6_cidr_map.pop(cidr_struct)
logging.info(f"CIDR: {cidr} have have been removed")
if result == 1:
logging.info(f"CIDR: {cidr} have have been skipped for it not exists")
return result
except Exception as e:
logging.error(f"Failed to remove CIDR {str(cidr)} from Map due to {e}")
return -1
def banlist_sync(self):
'''
Walk through the banned_ips and Change their Status
'''
logging.info("Banlist_sync thread is running")
while True:
time.sleep(self.sync_time)
self.__banlist_status_sync(self.banlist_v4)
# Load changed V4 map to bpf map
self.ipv4_cidr_map.clear()
for cidr in self.banlist_v4.cidr_list:
self.ipv4_cidr_map[self.banlist_v4.cidr_map[cidr]] = self.banlist_v4.element_map[cidr]
logging.info("Banlist_sync for Ipv4 success")
self.__banlist_status_sync(self.banlist_v6)
# Load changed V6 map to bpf map
self.ipv6_cidr_map.clear()
for cidr, cidr_info in self.banlist_v6.element_map.items():
self.ipv6_cidr_map[self.banlist_v6.cidr_map[cidr]] = self.banlist_v6.element_map[cidr]
logging.info("Banlist_sync for Ipv6 success")
def __banlist_status_sync(self, ban_list: BanList):
'''
Walk through the banned_ips and Change their Status
'''
sync_time = time.time_ns()
if_rewrite = 0
for cidr, cidr_info in ban_list.element_map.items():
if cidr_info.status == 1 and cidr_info.type == 0 and (cidr_info.timeout_time < sync_time):
if_rewrite = 1
if self.auto_remove_enabled:
ban_list.remove_cidr(cidr, rewrite_enable=False)
cidr_info.status = 0
if if_rewrite == 1:
ban_list.rewrite_banlist()
ban_list.load_banlist(ban_list.persistence_path, clear_enable=True)