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network_policy_controller.py
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network_policy_controller.py
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from kubernetes import client, config, watch
import kubernetes
import time
from tornado.ioloop import IOLoop
from tornado import gen
import pika
import sys
def send_policy_to_node(node_name, iptables):
#To-Do: Add check for rabbitmq status before sending the message
connection = pika.BlockingConnection(pika.ConnectionParameters(host='localhost'))
channel = connection.channel()
channel.exchange_declare(exchange='topic_logs', exchange_type='topic')
routing_key = node_name if node_name != None else 'iptables.info'
message = ''.join(iptables) or 'No action!'
channel.basic_publish(exchange='topic_logs', routing_key=routing_key, body=message)
print(" [x] Sent %r:%r" % (routing_key, message))
connection.close()
def create_new_policy_rules(network_policy, uid, callback):
print 'Checking policy contents to add iptables based rules'
policy_info = {}
if 'metadata' in network_policy[uid]:
if 'namespace' in network_policy[uid]['metadata']:
policy_info['namespace'] = network_policy[uid]['metadata']['namespace']
#Determing default deny or default allow policies for Ingress and Egress
if network_policy[uid]['spec']['podSelector'] != {}:
if 'policyTypes' in network_policy[uid]['spec']:
if len(network_policy[uid]['spec']['policyTypes']) == 2:
if network_policy[uid]['spec']['policyTypes'] == ['Ingress', 'Egress']:
if 'podSelector' in network_policy[uid]['spec']:
if network_policy[uid]['spec']['podSelector'] == {}:
policy_info['policy_type'] = 'default_deny_for_ingress_and_egress'
else:
policy_info['policy_type'] = 'network_policy'
elif len(network_policy[uid]['spec']['policyTypes']) == 1:
if network_policy[uid]['spec']['policyTypes'] == 'Ingress':
if 'podSelector' in network_policy[uid]['spec']:
if network_policy[uid]['spec']['podSelector'] == {}:
policy_info['policy_type'] = 'default_deny_for_ingress'
else:
policy_info['policy_type'] = 'network_policy'
elif network_policy[uid]['spec']['policyTypes'] == 'Egress':
if 'podSelector' in network_policy[uid]['spec']:
if network_policy[uid]['spec']['podSelector'] == {}:
policy_info['policy_type'] = 'default_deny_for_egress'
else:
policy_info['policy_type'] = 'network_policy'
else:
if 'ingress' in network_policy[uid]['spec']:
if network_policy[uid]['spec']['ingress'] == [{}]:
if network_policy[uid]['spec']['podSelector'] == {}:
policy_info['policy_type'] = 'default_allow_for_ingress'
elif 'egress' in network_policy[uid]['spec']:
if network_policy[uid]['spec']['egress'] == [{}]:
if network_policy[uid]['spec']['podSelector'] == {}:
policy_info['policy_type'] = 'default_allow_for_egress'
elif len(network_policy[uid]['spec']['policyTypes']) == 1:
if network_policy[uid]['spec']['policyTypes'] == ['Ingress']:
if 'podSelector' in network_policy[uid]['spec']:
if network_policy[uid]['spec']['podSelector'] == {}:
policy_info['policy_type'] = 'default_deny_for_ingress'
else:
policy_info['policy_type'] = 'network_policy'
elif network_policy[uid]['spec']['policyTypes'] == ['Egress']:
if 'podSelector' in network_policy[uid]['spec']:
if network_policy[uid]['spec']['podSelector'] == {}:
policy_info['policy_type'] = 'default_deny_for_egress'
else:
policy_info['policy_type'] = 'network_policy'
elif len(network_policy[uid]['spec']['policyTypes']) == 2:
if network_policy[uid]['spec']['policyTypes'] == ['Ingress', 'Egress']:
if 'podSelector' in network_policy[uid]['spec']:
if network_policy[uid]['spec']['podSelector'] == {}:
policy_info['policy_type'] = 'default_deny_for_ingress_and_egress'
else:
policy_info['policy_type'] = 'network_policy'
#Parse Network policy ports and labels
if policy_info['policy_type'] == 'network_policy':
ingress_egress_info = get_ingress_egress_policy_info(network_policy, uid)
if 'podSelector' in network_policy[uid]['spec']:
if 'matchLabels' in network_policy[uid]['spec']['podSelector']:
policy_info['pod_selector_labels'] = network_policy[uid]['spec']['podSelector']['matchLabels']
policy_list = {}
policy_list_ingress = {}
policy_list_egress = {}
if policy_info['policy_type'] == 'network_policy':
print "Network policy has both ingress and egress"
policy_list_ingress = create_ingress_iptable_rules(ingress_egress_info['ingress'], policy_info)
policy_list_egress = create_egress_iptable_rules(ingress_egress_info['egress'], policy_info)
elif policy_info['policy_type'] == 'default_allow_for_ingress':
print "Network policy is default allow for Ingress"
policy_list = create_default_allow_iptable_rules(policy_info['policy_type'], policy_info['namespace'])
elif policy_info['policy_type'] == 'default_allow_for_egress':
print "network policy is default allow for egress"
policy_list = create_default_allow_iptable_rules(policy_info['policy_type'], policy_info['namespace'])
elif policy_info['policy_type'] == 'default_deny_for_ingress':
policy_list = create_default_deny_iptable_rules(policy_info['policy_type'], policy_info['namespace'])
elif policy_info['policy_type'] == 'default_deny_for_egress':
policy_list = create_default_deny_iptable_rules(policy_info['policy_type'], policy_info['namespace'])
elif policy_info['policy_type'] == 'default_deny_for_ingress_and_egress':
policy_list = create_default_ingress_egress_deny_iptable_rules(policy_info['policy_type'], policy_info['namespace'])
#print policy_list
callback(policy_list)
def create_ingress_iptable_rules(ingress_info, policy_info):
print ingress_info, policy_info
policy_list = {}
pod_arr = []
if policy_info['policy_type'] == 'network_policy':
if 'pod_labels' in ingress_info:
if 'namespace' in policy_info:
if policy_info['namespace'] != ' ':
pod_arr = get_ingress_nodes_of_pods_pod_selector(policy_info['namespace'], ingress_info['pod_labels'])
dest_pod_arr = []
if policy_info['policy_type'] == 'network_policy':
if 'pod_selector_labels' in policy_info:
if 'namespace' in policy_info:
if policy_info['namespace'] != ' ':
dest_pod_arr = get_ingress_nodes_of_pods_pod_selector(policy_info['namespace'], policy_info['pod_selector_labels'])
namespace_pod_arr = []
if 'namespace_labels' in ingress_info:
namespace_pod_arr = get_ingress_nodes_of_pods_namespace_selector(ingress_info['namespace_labels'])
print pod_arr, dest_pod_arr, namespace_pod_arr
if pod_arr != []:
if dest_pod_arr != []:
for policy_pod in xrange(len(dest_pod_arr)):
#Delete any existing rule
#iptables -A FORWARD -m comment --comment "network policy chain for POD podname " -d <podIP> -j KUBE-NWPLCY-podnamehash
policy_del = 'iptables -D FORWARD -d '+pod_arr[policy_pod]['pod_ip']+' -m comment --comment \" network policy chain for POD '+ dest_pod_arr[policy_pod]['pod_name'] + '\" -j KUBE-NWPLCY-'+ dest_pod_arr[policy_pod]['pod_name'][-5:]
send_policy_to_node(dest_pod_arr[policy_pod]['node_name'], policy_del)
time.sleep(1)
print policy_del
#Optionally add a per policy forwarding chain as follows
#-A KUBE-NWPLCY-7UYHFX -m comment --comment "network policy rule for pod redis-slave-132015689-fksjt;policy: guestbook-network-policy" -j KUBE-NWPLCY-7UYHFX-SYJW74
#Add the new rule now
policy = 'iptables -N' + ' KUBE-NWPLCY-'+ dest_pod_arr[policy_pod]['pod_name'][-5:]
send_policy_to_node(dest_pod_arr[policy_pod]['node_name'], policy)
time.sleep(1)
policy = 'iptables -A FORWARD -d '+pod_arr[policy_pod]['pod_ip']+' -m comment --comment \" network policy chain for POD '+ dest_pod_arr[policy_pod]['pod_name'] + '\" -j KUBE-NWPLCY-'+ dest_pod_arr[policy_pod]['pod_name'][-5:]
send_policy_to_node(dest_pod_arr[policy_pod]['node_name'], policy)
time.sleep(1)
if dest_pod_arr[policy_pod]['node_name'] in policy_list:
policy_list[dest_pod_arr[policy_pod]['node_name']].append(policy_del)
else:
policy_list[dest_pod_arr[policy_pod]['node_name']] = []
policy_list[dest_pod_arr[policy_pod]['node_name']].append(policy_del)
for pod in xrange(len(pod_arr)):
#-A KUBE-NWPLCY-7UYHFX -s 10.244.3.4/32 -p tcp -m tcp --dport 6379 -m comment --comment "nw policy rule for peer POD frontend-88237173-zir4y" -j ACCEPT
#Delete any existing rule
#assuming only one pair of port and protocol for now
if 'ingress_ports' in ingress_info:
policy_del = 'iptables -D KUBE-NWPLCY-'+ dest_pod_arr[policy_pod]['pod_name'][-5:] + ' -s '+pod_arr[pod]['pod_ip']+' -p ' +str(ingress_info['ingress_ports'][0]['protocol'].lower())+ ' -m '+str(ingress_info['ingress_ports'][0]['protocol'].lower())+ ' --dport ' + str(ingress_info['ingress_ports'][0]['port'])+ ' -m comment --comment \"network policy for POD '+ dest_pod_arr[policy_pod]['pod_name'] + ' from pod' + pod_arr[pod]['pod_name'] + '\" -j ACCEPT'
else:
policy_del = 'iptables -D KUBE-NWPLCY-'+ dest_pod_arr[policy_pod]['pod_name'][-5:] + ' -s '+pod_arr[pod]['pod_ip']+' -m comment --comment \"network policy for POD '+ dest_pod_arr[policy_pod]['pod_name'] + ' from pod' + pod_arr[pod]['pod_name'] + '\" -j ACCEPT'
send_policy_to_node(pod_arr[pod]['node_name'], policy_del)
time.sleep(1)
#Add the new rule now
if 'ingress_ports' in ingress_info:
policy = 'iptables -A KUBE-NWPLCY-'+ dest_pod_arr[policy_pod]['pod_name'][-5:] + ' -s '+pod_arr[pod]['pod_ip']+' -p ' +str(ingress_info['ingress_ports'][0]['protocol'].lower())+ ' -m '+str(ingress_info['ingress_ports'][0]['protocol'].lower())+ ' --dport ' + str(ingress_info['ingress_ports'][0]['port'])+ ' -m comment --comment \"network policy for POD '+ dest_pod_arr[policy_pod]['pod_name'] + ' from pod' + pod_arr[pod]['pod_name'] + '\" -j ACCEPT'
else:
policy = 'iptables -A KUBE-NWPLCY-'+ dest_pod_arr[policy_pod]['pod_name'][-5:] + ' -s '+pod_arr[pod]['pod_ip']+' -m comment --comment \"network policy for POD '+ dest_pod_arr[policy_pod]['pod_name'] + ' from pod' + pod_arr[pod]['pod_name'] + '\" -j ACCEPT'
send_policy_to_node(dest_pod_arr[pod]['node_name'], policy)
time.sleep(1)
if dest_pod_arr[pod]['node_name'] in policy_list:
policy_list[dest_pod_arr[pod]['node_name']].append(policy_del)
else:
policy_list[dest_pod_arr[pod]['node_name']] = []
policy_list[dest_pod_arr[pod]['node_name']].append(policy_del)
if pod_arr != []:
if namespace_pod_arr != []:
for policy_pod in xrange(len(dest_pod_arr)):
#-A KUBE-NWPLCY-7UYHFX -s 10.244.3.4/32 -p tcp -m tcp --dport 6379 -m comment --comment "nw policy rule for peer POD frontend-88237173-zir4y" -j ACCEPT
#Delete any existing rule
#assuming only one pair of port and protocol for now
if 'ingress_ports' in ingress_info:
policy_del = 'iptables -D KUBE-NWPLCY-'+ dest_pod_arr[policy_pod]['pod_name'][-5:] + ' -s '+namespace_pod_arr[pod]['pod_ip']+' -p ' +str(ingress_info['ingress_ports'][0]['protocol'].lower())+ ' -m '+str(ingress_info['ingress_ports'][0]['protocol'].lower())+ ' --dport ' + str(ingress_info['ingress_ports'][0]['port'])+ ' -m comment --comment \"network policy for POD '+ dest_pod_arr[policy_pod]['pod_name'] + ' from pod' + namespace_pod_arr[pod]['pod_name'] + '\" -j ACCEPT'
else:
policy_del = 'iptables -D KUBE-NWPLCY-'+ dest_pod_arr[policy_pod]['pod_name'][-5:] + ' -s '+namespace_pod_arr[pod]['pod_ip']+' -m comment --comment \"network policy for POD '+ dest_pod_arr[policy_pod]['pod_name'] + ' from pod' + namespace_pod_arr[pod]['pod_name'] + '\" -j ACCEPT'
send_policy_to_node(dest_pod_arr[pod]['node_name'], policy_del)
time.sleep(1)
#Add the new rule now
if 'ingress_ports' in ingress_info:
policy = 'iptables -A KUBE-NWPLCY-'+ dest_pod_arr[policy_pod]['pod_name'][-5:] + ' -s '+namespace_pod_arr[pod]['pod_ip']+' -p ' +str(ingress_info['ingress_ports'][0]['protocol'].lower())+ ' -m '+str(ingress_info['ingress_ports'][0]['protocol'].lower())+ ' --dport ' + str(ingress_info['ingress_ports'][0]['port'])+ ' -m comment --comment \"network policy for POD '+ dest_pod_arr[policy_pod]['pod_name'] + ' from pod' + namespace_pod_arr[pod]['pod_name'] + '\" -j ACCEPT'
else:
policy = 'iptables -A KUBE-NWPLCY-'+ dest_pod_arr[policy_pod]['pod_name'][-5:] + ' -s '+namespace_pod_arr[pod]['pod_ip']+' -m comment --comment \"network policy for POD '+ dest_pod_arr[policy_pod]['pod_name'] + ' from pod ' + namespace_pod_arr[pod]['pod_name'] + '\" -j ACCEPT'
send_policy_to_node(dest_pod_arr[pod]['node_name'], policy)
time.sleep(1)
if dest_pod_arr[pod]['node_name'] in policy_list:
policy_list[dest_pod_arr[pod]['node_name']].append(policy_del)
else:
policy_list[dest_pod_arr[pod]['node_name']] = []
policy_list[dest_pod_arr[pod]['node_name']].append(policy_del)
if dest_pod_arr != []:
if 'from_ip_block_cidr' in ingress_info:
for pod in xrange(len(dest_pod_arr)):
#-A KUBE-NWPLCY-7UYHFX -s 10.244.3.4/32 -p tcp -m tcp --dport 6379 -m comment --comment "nw policy rule for peer POD frontend-88237173-zir4y" -j ACCEPT
#Delete any existing rule
#assuming only one pair of port and protocol for now
if 'ingress_ports' in ingress_info:
policy_del = 'iptables -D KUBE-NWPLCY-'+ dest_pod_arr[policy_pod]['pod_name'][-5:] + ' -s '+ingress_info['from_ip_block_cidr']+' -p ' +str(ingress_info['ingress_ports'][0]['protocol'].lower())+ ' -m '+str(ingress_info['ingress_ports'][0]['protocol'].lower())+ ' --dport ' + str(ingress_info['ingress_ports'][0]['port'])+ ' -m comment --comment \"network policy for POD '+ dest_pod_arr[policy_pod]['pod_name'] + ' from' + ingress_info['from_ip_block_cidr'] + '\" -j ACCEPT'
if 'except_ip_cidrs' in ingress_info:
policy_del_two = 'iptables -D KUBE-NWPLCY-'+ dest_pod_arr[policy_pod]['pod_name'][-5:] + ' -s '+ingress_info['except_ip_cidrs'][0]+' -p ' +str(ingress_info['ingress_ports'][0]['protocol'].lower())+ ' -m '+str(ingress_info['ingress_ports'][0]['protocol'].lower())+ ' --dport ' + str(ingress_info['ingress_ports'][0]['port'])+ ' -m comment --comment \"network policy for POD '+ dest_pod_arr[policy_pod]['pod_name'] + ' from' + ingress_info['except_ip_cidrs'][0] + '\" -j DROP'
else:
policy_del = 'iptables -D KUBE-NWPLCY-'+ dest_pod_arr[policy_pod]['pod_name'][-5:] + ' -s '+namespace_pod_arr[pod]['pod_ip']+' -m comment --comment \"network policy for POD '+ dest_pod_arr[policy_pod]['pod_name'] + ' from pod' + namespace_pod_arr[pod]['pod_name'] + '\" -j ACCEPT'
if 'except_ip_cidrs' in ingress_info:
policy_del_two = 'iptables -D KUBE-NWPLCY-'+ dest_pod_arr[policy_pod]['pod_name'][-5:] + ' -s '+ingress_info['except_ip_cidrs'][0]+' -m comment --comment \"network policy for POD '+ dest_pod_arr[policy_pod]['pod_name'] + ' from' + ingress_info['except_ip_cidrs'][0] + '\" -j DROP'
send_policy_to_node(dest_pod_arr[pod]['node_name'], policy_del)
time.sleep(1)
send_policy_to_node(dest_pod_arr[pod]['node_name'], policy_del_two)
time.sleep(1)
if 'ingress_ports' in ingress_info:
policy = 'iptables -A KUBE-NWPLCY-'+ dest_pod_arr[policy_pod]['pod_name'][-5:] + ' -s '+ingress_info['from_ip_block_cidr']+' -p ' +str(ingress_info['ingress_ports'][0]['protocol'].lower())+ ' -m '+str(ingress_info['ingress_ports'][0]['protocol'].lower())+ ' --dport ' + str(ingress_info['ingress_ports'][0]['port'])+ ' -m comment --comment \"network policy for POD '+ dest_pod_arr[policy_pod]['pod_name'] + ' from' + ingress_info['from_ip_block_cidr'] + '\" -j ACCEPT'
if 'except_ip_cidrs' in ingress_info:
policy_two = 'iptables -A KUBE-NWPLCY-'+ dest_pod_arr[policy_pod]['pod_name'][-5:] + ' -s '+ingress_info['except_ip_cidrs'][0]+' -p ' +str(ingress_info['ingress_ports'][0]['protocol'].lower())+ ' -m '+str(ingress_info['ingress_ports'][0]['protocol'].lower())+ ' --dport ' + str(ingress_info['ingress_ports'][0]['port'])+ ' -m comment --comment \"network policy for POD '+ dest_pod_arr[policy_pod]['pod_name'] + ' from' + ingress_info['except_ip_cidrs'][0] + '\" -j DROP'
else:
policy = 'iptables -A KUBE-NWPLCY-'+ dest_pod_arr[policy_pod]['pod_name'][-5:] + ' -s '+namespace_pod_arr[pod]['pod_ip']+' -m comment --comment \"network policy for POD '+ dest_pod_arr[policy_pod]['pod_name'] + ' from pod' + namespace_pod_arr[pod]['pod_name'] + '\" -j ACCEPT'
if 'except_ip_cidrs' in ingress_info:
policy_two = 'iptables -A KUBE-NWPLCY-'+ dest_pod_arr[policy_pod]['pod_name'][-5:] + ' -s '+ingress_info['except_ip_cidrs'][0]+ '-m comment --comment \"network policy for POD '+ dest_pod_arr[policy_pod]['pod_name'] + ' from' + ingress_info['except_ip_cidrs'][0] + '\" -j DROP'
print policy
send_policy_to_node(dest_pod_arr[pod]['node_name'], policy)
time.sleep(1)
print policy_two
send_policy_to_node(dest_pod_arr[pod]['node_name'], policy_two)
time.sleep(1)
if dest_pod_arr[pod]['node_name'] in policy_list:
policy_list[dest_pod_arr[pod]['node_name']].append(policy_del)
policy_list[dest_pod_arr[pod]['node_name']].append(policy_del_two)
else:
policy_list[dest_pod_arr[pod]['node_name']] = []
policy_list[dest_pod_arr[pod]['node_name']].append(policy_del)
policy_list[dest_pod_arr[pod]['node_name']].append(policy_del_two)
return policy_list
def create_egress_iptable_rules(egress_info, policy_info):
policy_list = {}
#Implement for all possible scenarios like ingress - ipBlock, pod_selector_labels, namespace_labels etc.
#For now, just using ports and ipBlock
src_pod_arr = []
if policy_info['policy_type'] == 'network_policy':
if 'pod_selector_labels' in policy_info:
if 'namespace' in policy_info:
if policy_info['namespace'] != ' ':
src_pod_arr = get_ingress_nodes_of_pods_pod_selector(policy_info['namespace'], policy_info['pod_selector_labels'])
if 'to_ip_block_cidr' in egress_info:
if 'egress_ports' in egress_info:
for policy_pod in xrange(len(src_pod_arr)):
#Delete any existing rule
#assuming only one pair of port and protocol for now
if 'egress_ports' in egress_info:
policy_del = 'iptables -D KUBE-NWPLCY-'+ src_pod_arr[policy_pod]['pod_name'][-5:] + ' -d '+egress_info['to_ip_block_cidr']+' -p ' +str(egress_info['egress_ports'][0]['protocol'].lower())+ ' -m '+str(egress_info['egress_ports'][0]['protocol'].lower())+ ' --sport ' + str(egress_info['egress_ports'][0]['port']) + ' -m comment --comment \"network policy for POD '+ src_pod_arr[policy_pod]['pod_name'] + ' from' + egress_info['to_ip_block_cidr'] + '\" -j ACCEPT'
else:
policy_del = 'iptables -D KUBE-NWPLCY-'+ src_pod_arr[policy_pod]['pod_name'][-5:] + ' -d '+egress_info['to_ip_block_cidr']+' -m comment --comment \"network policy for POD '+ src_pod_arr[policy_pod]['pod_name'] + ' from ' + egress_info['to_ip_block_cidr'] + '\" -j ACCEPT'
policy_two_del = 'iptables -D KUBE-NWPLCY-'+ src_pod_arr[policy_pod]['pod_name'][-5:] + ' -j REJECT'
send_policy_to_node(src_pod_arr[policy_pod]['node_name'], policy_del)
time.sleep(1)
send_policy_to_node(src_pod_arr[policy_pod]['node_name'], policy_two_del)
time.sleep(1)
if 'egress_ports' in egress_info:
policy = 'iptables -A KUBE-NWPLCY-'+ src_pod_arr[policy_pod]['pod_name'][-5:] + '-d '+pod_arr[policy_pod]['pod_ip']+' ' -d '+egress_info['to_ip_block_cidr']+' -p ' + str(egress_info['egress_ports'][0]['protocol'].lower())+ ' -m '+str(egress_info['egress_ports'][0]['protocol'].lower())+ ' --sport ' + str(egress_info['egress_ports'][0]['port'])+ ' -m comment --comment \"network policy for POD '+ src_pod_arr[policy_pod]['pod_name'] + ' from' + egress_info['to_ip_block_cidr'] + '\" -j ACCEPT'
else:
policy = 'iptables -A KUBE-NWPLCY-'+ src_pod_arr[policy_pod]['pod_name'][-5:] + ' -d '+egress_info['to_ip_block_cidr']+ ' -m comment --comment \"network policy for POD '+ src_pod_arr[policy_pod]['pod_name'] + ' from ' + egress_info['to_ip_block_cidr'] + '\" -j ACCEPT'
policy_two = 'iptables -A KUBE-NWPLCY-'+ src_pod_arr[policy_pod]['pod_name'][-5:] + ' -j REJECT'
send_policy_to_node(src_pod_arr[policy_pod]['node_name'], policy)
time.sleep(1)
send_policy_to_node(src_pod_arr[policy_pod]['node_name'], policy_two)
time.sleep(1)
if src_pod_arr[policy_pod]['node_name'] in policy_list:
policy_list[src_pod_arr[policy_pod]['node_name']].append(policy_del)
policy_list[src_pod_arr[policy_pod]['node_name']].append(policy_two_del)
else:
policy_list[src_pod_arr[policy_pod]['node_name']] = []
policy_list[src_pod_arr[policy_pod]['node_name']].append(policy_del)
policy_list[src_pod_arr[policy_pod]['node_name']].append(policy_two_del)
return policy_list
def create_default_ingress_egress_deny_iptable_rules(policy_type, namespace):
if policy_type == 'default_deny_for_ingress_and_egress':
policy_list_ingress = {}
policy_list_ingress = create_default_deny_iptable_rules('default_deny_for_ingress', namespace)
policy_list_egress = {}
policy_list_egress = create_default_deny_iptable_rules('default_deny_for_egress', namespace)
for key in policy_list_ingress:
if key in policy_list_egress:
for rules in policy_list_egress[key]:
policy_list_ingress[key].append(rules)
else:
policy_list_ingress[key] = []
for rules in policy_list_egress[key]:
policy_list_ingress[key].append(rules)
for key in policy_list_egress:
if key not in policy_list_ingress:
policy_list_ingress[key] = []
for rules in policy_list_egress[key]:
policy_list_ingress[key].append(rules)
return policy_list_ingress
def create_default_deny_iptable_rules(policy_type, namespace):
pod_arr = []
policy_list = {}
if policy_type == 'default_deny_for_ingress':
if namespace != ' ':
pod_arr = get_pods_of_namespace(namespace)
for pod in xrange(len(pod_arr)):
#Delete any existing rule
policy_del = 'iptables -D OUTPUT -d '+pod_arr[pod]['pod_ip']+' -m comment --comment \"default ingress deny network policy for POD '+ pod_arr[pod]['pod_name'] + '\" -j DROP'
send_policy_to_node(pod_arr[pod]['node_name'], policy_del)
time.sleep(1)
#Add the new rule now
policy = 'iptables -I OUTPUT -d '+pod_arr[pod]['pod_ip']+' -m comment --comment \"default ingress deny network policy for POD '+ pod_arr[pod]['pod_name'] + '\" -j DROP'
send_policy_to_node(pod_arr[pod]['node_name'], policy)
time.sleep(1)
if pod_arr[pod]['node_name'] in policy_list:
policy_list[pod_arr[pod]['node_name']].append(policy_del)
else:
policy_list[pod_arr[pod]['node_name']] = []
policy_list[pod_arr[pod]['node_name']].append(policy_del)
elif policy_type == 'default_deny_for_egress':
if namespace != ' ':
pod_arr = get_pods_of_namespace(namespace)
for pod in xrange(len(pod_arr)):
#delete any exisiting rule
policy_del = 'iptables -D INPUT -s '+pod_arr[pod]['pod_ip']+' -m comment --comment \"default egress deny network policy for POD '+ pod_arr[pod]['pod_name'] + '\" -j DROP'
send_policy_to_node(pod_arr[pod]['node_name'], policy_del)
time.sleep(1)
#Add the new rule
policy = 'iptables -I INPUT -s '+pod_arr[pod]['pod_ip']+' -m comment --comment \"default egress deny network policy for POD '+ pod_arr[pod]['pod_name'] + '\" -j DROP'
send_policy_to_node(pod_arr[pod]['node_name'], policy)
time.sleep(1)
if pod_arr[pod]['node_name'] in policy_list:
policy_list[pod_arr[pod]['node_name']].append(policy_del)
else:
policy_list[pod_arr[pod]['node_name']] = []
policy_list[pod_arr[pod]['node_name']].append(policy_del)
return policy_list
def create_default_allow_iptable_rules(policy_type, namespace):
pod_arr = []
policy_list = {}
if policy_type == 'default_allow_for_ingress':
if namespace != ' ':
pod_arr = get_pods_of_namespace(namespace)
for pod in xrange(len(pod_arr)):
#Delete any existing rule
policy_del = 'iptables -D OUTPUT -d '+pod_arr[pod]['pod_ip']+' -m comment --comment \"default ingress allow network policy for POD '+ pod_arr[pod]['pod_name'] + '\" -j ACCEPT'
send_policy_to_node(pod_arr[pod]['node_name'], policy_del)
time.sleep(1)
#Add the new rule now
policy = 'iptables -I OUTPUT -d '+pod_arr[pod]['pod_ip']+' -m comment --comment \"default ingress allow network policy for POD '+ pod_arr[pod]['pod_name'] + '\" -j ACCEPT'
send_policy_to_node(pod_arr[pod]['node_name'], policy)
time.sleep(1)
if pod_arr[pod]['node_name'] in policy_list:
policy_list[pod_arr[pod]['node_name']].append(policy_del)
else:
policy_list[pod_arr[pod]['node_name']] = []
policy_list[pod_arr[pod]['node_name']].append(policy_del)
elif policy_type == 'default_allow_for_egress':
if namespace != ' ':
pod_arr = get_pods_of_namespace(namespace)
for pod in xrange(len(pod_arr)):
#delete any exisiting rule
policy_del = 'iptables -D INPUT -s '+pod_arr[pod]['pod_ip']+' -m comment --comment \"default egress allow network policy for POD '+ pod_arr[pod]['pod_name'] + '\" -j ACCEPT'
send_policy_to_node(pod_arr[pod]['node_name'], policy_del)
time.sleep(1)
#Add the new rule
policy = 'iptables -I INPUT -s '+pod_arr[pod]['pod_ip']+' -m comment --comment \"default egress allow network policy for POD '+ pod_arr[pod]['pod_name'] + '\" -j ACCEPT'
send_policy_to_node(pod_arr[pod]['node_name'], policy)
time.sleep(1)
if pod_arr[pod]['node_name'] in policy_list:
policy_list[pod_arr[pod]['node_name']].append(policy_del)
else:
policy_list[pod_arr[pod]['node_name']] = []
policy_list[pod_arr[pod]['node_name']].append(policy_del)
return policy_list
def get_ingress_egress_policy_info(network_policy, uid):
ingress_info = {}
egress_info = {}
ingress_egress_info = {}
for policyTypes in network_policy[uid]['spec']['policyTypes']:
if policyTypes == 'Ingress':
for items in network_policy[uid]['spec']['ingress']:
if 'ports' in items:
ingress_info['ingress_ports'] = items['ports']
for filters in items['from']:
if 'ipBlock' in filters:
ingress_info['from_ip_block_cidr'] = filters['ipBlock']['cidr']
if 'except' in filters['ipBlock']:
ingress_info['except_ip_cidrs'] = filters['ipBlock']['except']
elif 'namespaceSelector' in filters:
if 'matchLabels' in filters['namespaceSelector']:
ingress_info['namespace_labels'] = filters['namespaceSelector']['matchLabels']
elif 'podSelector' in filters:
if 'matchLabels' in filters['podSelector']:
ingress_info['pod_labels'] = filters['podSelector']['matchLabels']
elif policyTypes == 'Egress':
for items in network_policy[uid]['spec']['egress']:
if 'ports' in items:
egress_info['egress_ports'] = items['ports']
for filters in items['to']:
if 'ipBlock' in filters:
egress_info['to_ip_block_cidr'] = filters['ipBlock']['cidr']
if 'except' in filters['ipBlock']:
egress_info['except_ip_cidrs'] = filters['ipBlock']['except']
elif 'namespaceSelector' in filters:
if 'matchLabels' in filters['namespaceSelector']:
egress_info['namespace_labels'] = filters['namespaceSelector']['matchLabels']
elif 'podSelector' in filters:
egress_info['pod_labels'] = filters['podSelector']['matchLabels']
ingress_egress_info['ingress'] = ingress_info
ingress_egress_info['egress'] = egress_info
return ingress_egress_info
def get_pods_of_namespace(namespace):
pod_arr = []
pod_dict = {}
configuration = config.load_kube_config()
api_instance_pod = kubernetes.client.CoreV1Api(kubernetes.client.ApiClient(configuration))
include_uninitialized = True
limit = 56
pretty = 'true'
timeout_seconds = 30
watch = False
api_response = api_instance_pod.list_namespaced_pod(namespace, pretty=pretty, include_uninitialized=include_uninitialized, limit=limit, timeout_seconds=timeout_seconds)
for pod in xrange(len(api_response.items)):
pod_dict['pod_name'] = api_response.items[pod].metadata.name
pod_dict['node_name'] = api_response.items[pod].spec.node_name
pod_dict['pod_ip'] = api_response.items[pod].status.pod_ip
pod_arr.append(pod_dict)
pod_dict = {}
return pod_arr
def get_ingress_nodes_of_pods_pod_selector(namespace, pod_labels):
pod_dict = {}
pod_arr = []
configuration = config.load_kube_config()
api_instance_pod = kubernetes.client.CoreV1Api(kubernetes.client.ApiClient(configuration))
include_uninitialized = True
for key in pod_labels:
pod_labels_str = key+'='+pod_labels[key]
label_selector = pod_labels_str
limit = 56
pretty = 'true'
timeout_seconds = 30
watch = False
api_response = api_instance_pod.list_namespaced_pod(namespace, pretty=pretty, include_uninitialized=include_uninitialized, label_selector=label_selector, limit=limit, timeout_seconds=timeout_seconds)
for pod in xrange(len(api_response.items)):
pod_dict['pod_name'] = api_response.items[pod].metadata.name
pod_dict['node_name'] = api_response.items[pod].spec.node_name
pod_dict['pod_ip'] = api_response.items[pod].status.pod_ip
pod_arr.append(pod_dict)
pod_dict = {}
return pod_arr
def get_ingress_nodes_of_pods_namespace_selector(namespace_selector_labels):
pod_arr = []
pod_dict = {}
configuration = config.load_kube_config()
api_instance_pod = kubernetes.client.CoreV1Api(kubernetes.client.ApiClient(configuration))
include_uninitialized = True
for key in namespace_selector_labels:
namespace_labels = key+'='+namespace_selector_labels[key]
label_selector = namespace_labels
limit = 56
pretty = 'true'
timeout_seconds = 30
watch = False
api_response = api_instance_pod.list_pod_for_all_namespaces(pretty=pretty, include_uninitialized=include_uninitialized, label_selector=label_selector, limit=limit, timeout_seconds=timeout_seconds)
for pod in xrange(len(api_response.items)):
pod_dict['pod_name'] = api_response.items[pod].metadata.name
pod_dict['node_name'] = api_response.items[pod].spec.node_name
pod_dict['pod_ip'] = api_response.items[pod].status.pod_ip
pod_arr.append(pod_dict)
pod_dict = {}
return pod_arr
def create_updated_policy_rules(network_policy_updated, callback):
print 'Checking updated policy contents to add iptables based rules'
time.sleep(1)
callback(network_policy_updated)
@gen.engine
def watch_for_policies():
config.load_kube_config()
v1 = client.ExtensionsV1beta1Api()
network_policy = {}
network_policy_update = {}
w = watch.Watch()
for event in w.stream(v1.list_network_policy_for_all_namespaces):
print event
print("Event: %s %s %s" % (event['type'], event['object'].kind, event['object'].metadata.name))
if event['type'] == 'ADDED':
if event['object'].metadata.uid not in network_policy:
network_policy[event['object'].metadata.uid] = event['raw_object']
result = yield gen.Task(create_new_policy_rules, network_policy, event['object'].metadata.uid)
elif event['type'] == 'UPDATED':
network_policy_updated[event['object'].metadata.uid] = event['raw_object']
result = yield gen.Task(create_updated_policy_rules, network_policy_updated)
IOLoop.instance().stop()
if __name__ == "__main__":
watch_for_policies()
IOLoop.instance().start()