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sync-security-group-with-cloudflare-ip-addresses.py
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sync-security-group-with-cloudflare-ip-addresses.py
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# Specify security group id and ports below.
# Each cloudflare IP address will be added for each port from-to combination.
# Caution: Any extra rules will be deleted from the specified security group.
# Only cloudflare IP addresses with the given combination of ports will remain
security_group_id = "sg-xxxxxxxxxxxxxxxxx"
ports = [
{"from": 80, "to": 80},
{"from": 443, "to": 443},
]
# No need to change anything below this line.
# But feel free to return any response.
import json
import copy
import boto3
import urllib3
def lambda_handler(event, context):
security_group = SecurityGroup(security_group_id, ports)
security_group.sync_with_cloudflare_ipaddresses()
return {"statusCode": 200, "body": "Success"}
class SecurityGroup:
"""SecurityGroup Class"""
cloudflare_ip_addresses_v4 = []
cloudflare_ip_addresses_v6 = []
ipv4_rule_map = []
ipv6_rule_map = []
security_group = None
ports = []
def __init__(self, security_group_id, ports):
self.cloudflare_ip_addresses_v4 = []
self.cloudflare_ip_addresses_v6 = []
self.ipv4_rule_map = []
self.ipv6_rule_map = []
ec2 = boto3.resource("ec2")
self.security_group = ec2.SecurityGroup(security_group_id)
self.ports = ports
def sync_with_cloudflare_ipaddresses(self):
self.grab_cloudflare_ipaddresses()
self.make_rule_maps()
self.process_inbound_rules()
return
def grab_cloudflare_ipaddresses(self):
http = urllib3.PoolManager()
response = http.request("GET", "https://www.cloudflare.com/ips-v4")
self.cloudflare_ip_addresses_v4 = response.data.decode("utf-8").split("\n")
http = urllib3.PoolManager()
response = http.request("GET", "https://www.cloudflare.com/ips-v6")
self.cloudflare_ip_addresses_v6 = response.data.decode("utf-8").split("\n")
return
def make_rule_maps(self):
for cidr in self.cloudflare_ip_addresses_v4:
for port in self.ports:
self.ipv4_rule_map.append({
"cidr": cidr,
"from_port": port["from"],
"to_port": port["to"],
})
for cidr in self.cloudflare_ip_addresses_v6:
for port in self.ports:
self.ipv6_rule_map.append({
"cidr": cidr,
"from_port": port["from"],
"to_port": port["to"],
})
return
def process_inbound_rules(self):
ingress_rules = self.security_group.ip_permissions
self.delete_ingress_rules_that_do_not_exist_anymore(ingress_rules)
self.insert_remaining_ingress_rules()
return
def port_combination_exists(self, from_port, to_port):
for port in ports:
if from_port == port["from"] and to_port == port["to"]:
return True
return False
def remove_ingress_rule_for_ipv4(self, ingress_rule, ipv4):
return self.security_group.revoke_ingress(
IpPermissions=[
{
"FromPort": ingress_rule["FromPort"],
"IpProtocol": ingress_rule["IpProtocol"],
"IpRanges": [
{"CidrIp": ipv4["CidrIp"]},
],
"ToPort": ingress_rule["ToPort"],
},
]
)
def remove_ingress_rule_for_ipv6(self, ingress_rule, ipv6):
return self.security_group.revoke_ingress(
IpPermissions=[
{
"FromPort": ingress_rule["FromPort"],
"IpProtocol": ingress_rule["IpProtocol"],
"Ipv6Ranges": [
{"CidrIpv6": ipv6["CidrIpv6"]},
],
"ToPort": ingress_rule["ToPort"],
},
]
)
def remove_ingress_rule(self, ingress_rule):
for ipv4 in ingress_rule["IpRanges"]:
self.remove_ingress_rule_for_ipv4(ingress_rule, ipv4)
for ipv6 in ingress_rule["Ipv6Ranges"]:
self.remove_ingress_rule_for_ipv6(ingress_rule, ipv6)
return
def delete_ingress_rules_that_do_not_exist_anymore(self, ingress_rules):
# Let's be honest, AWS API for security groups sucks.
# The ingress and egress rules objects have a poor programmatic structure.
# And the SDK doesn't help either
# Iterating rules object
temp_list = copy.deepcopy(ingress_rules)
for ingress_rule in temp_list:
if not self.port_combination_exists(ingress_rule["FromPort"], ingress_rule["ToPort"]):
self.remove_ingress_rule(ingress_rule)
ingress_rules.remove(ingress_rule)
continue
# Iterating IPv4 addresses
for ipv4 in ingress_rule["IpRanges"]:
if ipv4["CidrIp"] not in self.cloudflare_ip_addresses_v4:
self.remove_ingress_rule_for_ipv4(ingress_rule, ipv4)
else: # Our rule already exists in the security group
self.ipv4_rule_map.remove({"cidr": ipv4["CidrIp"], "from_port": ingress_rule["FromPort"], "to_port": ingress_rule["ToPort"]})
# Iterating IPv6 addresses
for ipv6 in ingress_rule["Ipv6Ranges"]:
if ipv6["CidrIpv6"] not in self.cloudflare_ip_addresses_v6:
self.remove_ingress_rule_for_ipv6(ingress_rule, ipv6)
else: # Our rule already exists in the security group
self.ipv6_rule_map.remove({"cidr": ipv6["CidrIpv6"], "from_port": ingress_rule["FromPort"], "to_port": ingress_rule["ToPort"]})
return
def insert_remaining_ingress_rules(self):
for rule in self.ipv4_rule_map:
self.security_group.authorize_ingress(
IpPermissions=[
{
"FromPort": rule["from_port"],
"IpProtocol": "tcp",
"IpRanges": [
{"CidrIp": rule["cidr"], "Description": ""},
],
"ToPort": rule["to_port"],
},
]
)
for rule in self.ipv6_rule_map:
self.security_group.authorize_ingress(
IpPermissions=[
{
"FromPort": rule["from_port"],
"IpProtocol": "tcp",
"Ipv6Ranges": [
{"CidrIpv6": rule["cidr"], "Description": ""},
],
"ToPort": rule["to_port"],
},
]
)
return