diff --git a/lib/azure_fence.py.py b/lib/azure_fence.py.py index 7bb43adc..4e44ca9d 100644 --- a/lib/azure_fence.py.py +++ b/lib/azure_fence.py.py @@ -1,347 +1,348 @@ import logging, re, time from fencing import fail_usage FENCE_SUBNET_NAME = "fence-subnet" FENCE_INBOUND_RULE_NAME = "FENCE_DENY_ALL_INBOUND" FENCE_INBOUND_RULE_DIRECTION = "Inbound" FENCE_OUTBOUND_RULE_NAME = "FENCE_DENY_ALL_OUTBOUND" FENCE_OUTBOUND_RULE_DIRECTION = "Outbound" FENCE_STATE_OFF = "off" FENCE_STATE_ON = "on" FENCE_TAG_SUBNET_ID = "FENCE_TAG_SUBNET_ID" FENCE_TAG_IP_TYPE = "FENCE_TAG_IP_TYPE" FENCE_TAG_IP = "FENCE_TAG_IP" IP_TYPE_DYNAMIC = "Dynamic" MAX_RETRY = 10 RETRY_WAIT = 5 class AzureSubResource: Type = None Name = None class AzureResource: Id = None SubscriptionId = None ResourceGroupName = None ResourceName = None SubResources = [] class AzureConfiguration: RGName = None VMName = None SubscriptionId = None Cloud = None UseMSI = None Tenantid = None ApplicationId = None ApplicationKey = None Verbose = None def get_from_metadata(parameter): import requests try: r = requests.get('http://169.254.169.254/metadata/instance?api-version=2017-08-01', headers = {"Metadata":"true"}) + logging.debug("metadata: " + str(r.json())) return str(r.json()["compute"][parameter]) except: logging.warning("Not able to use metadata service. Am I running in Azure?") return None def get_azure_resource(id): match = re.match('(/subscriptions/([^/]*)/resourceGroups/([^/]*))(/providers/([^/]*/[^/]*)/([^/]*))?((/([^/]*)/([^/]*))*)', id) if not match: fail_usage("{get_azure_resource} cannot parse resource id %s" % id) logging.debug("{get_azure_resource} found %s matches for %s" % (len(match.groups()), id)) iGroup = 0 while iGroup < len(match.groups()): logging.debug("{get_azure_resource} group %s: %s" %(iGroup, match.group(iGroup))) iGroup += 1 resource = AzureResource() resource.Id = id resource.SubscriptionId = match.group(2) resource.SubResources = [] if len(match.groups()) > 3: resource.ResourceGroupName = match.group(3) logging.debug("{get_azure_resource} resource group %s" % resource.ResourceGroupName) if len(match.groups()) > 6: resource.ResourceName = match.group(6) logging.debug("{get_azure_resource} resource name %s" % resource.ResourceName) if len(match.groups()) > 7 and match.group(7): splits = match.group(7).split("/") logging.debug("{get_azure_resource} splitting subtypes '%s' (%s)" % (match.group(7), len(splits))) i = 1 # the string starts with / so the first split is empty while i < len(splits) - 1: logging.debug("{get_azure_resource} creating subresource with type %s and name %s" % (splits[i], splits[i+1])) subRes = AzureSubResource() subRes.Type = splits[i] subRes.Name = splits[i+1] resource.SubResources.append(subRes) i += 2 return resource def get_fence_subnet_for_config(ipConfig, network_client): subnetResource = get_azure_resource(ipConfig.subnet.id) logging.debug("{get_fence_subnet_for_config} testing virtual network %s in resource group %s for a fence subnet" %(subnetResource.ResourceName, subnetResource.ResourceGroupName)) vnet = network_client.virtual_networks.get(subnetResource.ResourceGroupName, subnetResource.ResourceName) return get_subnet(vnet, FENCE_SUBNET_NAME) def get_subnet(vnet, subnetName): for avSubnet in vnet.subnets: logging.debug("{get_subnet} searching subnet %s testing subnet %s" % (subnetName, avSubnet.name)) if (avSubnet.name.lower() == subnetName.lower()): logging.debug("{get_subnet} subnet found %s" % avSubnet) return avSubnet def test_fence_subnet(fenceSubnet, nic, network_client): logging.info("{test_fence_subnet}") testOk = True if not fenceSubnet: testOk = False logging.info("{test_fence_subnet} No fence subnet found for virtual network of network interface %s" % nic.id) else: if not fenceSubnet.network_security_group: testOk = False logging.info("{test_fence_subnet} Fence subnet %s has not network security group" % fenceSubnet.id) else: nsgResource = get_azure_resource(fenceSubnet.network_security_group.id) logging.info("{test_fence_subnet} Getting network security group %s in resource group %s" % (nsgResource.ResourceName, nsgResource.ResourceGroupName)) nsg = network_client.network_security_groups.get(nsgResource.ResourceGroupName, nsgResource.ResourceName) inboundRule = get_inbound_rule_for_nsg(nsg) outboundRule = get_outbound_rule_for_nsg(nsg) if not outboundRule: testOk = False logging.info("{test_fence_subnet} Network Securiy Group %s of fence subnet %s has no outbound security rule that blocks all traffic" % (nsgResource.ResourceName, fenceSubnet.id)) elif not inboundRule: testOk = False logging.info("{test_fence_subnet} Network Securiy Group %s of fence subnet %s has no inbound security rule that blocks all traffic" % (nsgResource.ResourceName, fenceSubnet.id)) return testOk def get_inbound_rule_for_nsg(nsg): return get_rule_for_nsg(nsg, FENCE_INBOUND_RULE_NAME, FENCE_INBOUND_RULE_DIRECTION) def get_outbound_rule_for_nsg(nsg): return get_rule_for_nsg(nsg, FENCE_OUTBOUND_RULE_NAME, FENCE_OUTBOUND_RULE_DIRECTION) def get_rule_for_nsg(nsg, ruleName, direction): logging.info("{get_rule_for_nsg} Looking for security rule %s with direction %s" % (ruleName, direction)) if not nsg: logging.info("{get_rule_for_nsg} Network security group not set") return None for rule in nsg.security_rules: logging.info("{get_rule_for_nsg} Testing a %s securiy rule %s" % (rule.direction, rule.name)) if (rule.access == "Deny") and (rule.direction == direction) \ and (rule.source_port_range == "*") and (rule.destination_port_range == "*") \ and (rule.protocol == "*") and (rule.destination_address_prefix == "*") \ and (rule.source_address_prefix == "*") and (rule.provisioning_state == "Succeeded") \ and (rule.priority == 100) and (rule.name == ruleName): logging.info("{get_rule_for_nsg} %s rule found" % direction) return rule return None def get_network_state(compute_client, network_client, rgName, vmName): result = FENCE_STATE_ON try: vm = compute_client.virtual_machines.get(rgName, vmName, "instanceView") allNICOK = True for nicRef in vm.network_profile.network_interfaces: nicresource = get_azure_resource(nicRef.id) nic = network_client.network_interfaces.get(nicresource.ResourceGroupName, nicresource.ResourceName) for ipConfig in nic.ip_configurations: logging.info("{get_network_state} Testing ip configuration %s" % ipConfig.name) fenceSubnet = get_fence_subnet_for_config(ipConfig, network_client) testOk = test_fence_subnet(fenceSubnet, nic, network_client) if not testOk: allNICOK = False elif fenceSubnet.id.lower() != ipConfig.subnet.id.lower(): logging.info("{get_network_state} IP configuration %s is not in fence subnet (ip subnet: %s, fence subnet: %s)" % (ipConfig.name, ipConfig.subnet.id.lower(), fenceSubnet.id.lower())) allNICOK = False if allNICOK: logging.info("{get_network_state} All IP configurations of all network interfaces are in the fence subnet. Declaring VM as off") result = FENCE_STATE_OFF except Exception as e: fail_usage("{get_network_state} Failed: %s" % e) return result def set_network_state(compute_client, network_client, rgName, vmName, operation): import msrestazure.azure_exceptions logging.info("{set_network_state} Setting state %s for %s in resource group %s" % (operation, vmName, rgName)) vm = compute_client.virtual_machines.get(rgName, vmName, "instanceView") operations = [] for nicRef in vm.network_profile.network_interfaces: for attempt in range(0, MAX_RETRY): try: nicresource = get_azure_resource(nicRef.id) nic = network_client.network_interfaces.get(nicresource.ResourceGroupName, nicresource.ResourceName) if not nic.tags and operation == "block": nic.tags = {} logging.info("{set_network_state} Searching for tags required to unfence this virtual machine") for ipConfig in nic.ip_configurations: if operation == "block": fenceSubnet = get_fence_subnet_for_config(ipConfig, network_client) testOk = test_fence_subnet(fenceSubnet, nic, network_client) if testOk: logging.info("{set_network_state} Changing subnet of ip config of nic %s" % nic.id) nic.tags[("%s_%s" % (FENCE_TAG_SUBNET_ID, ipConfig.name))] = ipConfig.subnet.id nic.tags[("%s_%s" % (FENCE_TAG_IP_TYPE, ipConfig.name))] = ipConfig.private_ip_allocation_method nic.tags[("%s_%s" % (FENCE_TAG_IP, ipConfig.name))] = ipConfig.private_ip_address ipConfig.subnet = fenceSubnet ipConfig.private_ip_allocation_method = IP_TYPE_DYNAMIC else: fail_usage("{set_network_state} Network interface id %s does not have a network security group." % nic.id) elif operation == "unblock": if not nic.tags: fail_usage("{set_network_state} IP configuration %s is missing the required resource tags (empty)" % ipConfig.name) subnetId = nic.tags.pop("%s_%s" % (FENCE_TAG_SUBNET_ID, ipConfig.name)) ipType = nic.tags.pop("%s_%s" % (FENCE_TAG_IP_TYPE, ipConfig.name)) ipAddress = nic.tags.pop("%s_%s" % (FENCE_TAG_IP, ipConfig.name)) if (subnetId and ipType and (ipAddress or (ipType.lower() == IP_TYPE_DYNAMIC.lower()))): logging.info("{set_network_state} tags found (subnetId: %s, ipType: %s, ipAddress: %s)" % (subnetId, ipType, ipAddress)) subnetResource = get_azure_resource(subnetId) vnet = network_client.virtual_networks.get(subnetResource.ResourceGroupName, subnetResource.ResourceName) logging.info("{set_network_state} looking for subnet %s" % len(subnetResource.SubResources)) oldSubnet = get_subnet(vnet, subnetResource.SubResources[0].Name) if not oldSubnet: fail_usage("{set_network_state} subnet %s not found" % subnetId) ipConfig.subnet = oldSubnet ipConfig.private_ip_allocation_method = ipType if ipAddress: ipConfig.private_ip_address = ipAddress else: fail_usage("{set_network_state} IP configuration %s is missing the required resource tags(subnetId: %s, ipType: %s, ipAddress: %s)" % (ipConfig.name, subnetId, ipType, ipAddress)) logging.info("{set_network_state} updating nic %s" % (nic.id)) op = network_client.network_interfaces.create_or_update(nicresource.ResourceGroupName, nicresource.ResourceName, nic) operations.append(op) break except msrestazure.azure_exceptions.CloudError as cex: logging.error("{set_network_state} CloudError in attempt %s '%s'" % (attempt, cex)) if cex.error and cex.error.error and cex.error.error.lower() == "PrivateIPAddressIsBeingCleanedUp": logging.error("{set_network_state} PrivateIPAddressIsBeingCleanedUp") time.sleep(RETRY_WAIT) except Exception as ex: logging.error("{set_network_state} Exception of type %s: %s" % (type(ex).__name__, ex)) break def get_azure_config(options): config = AzureConfiguration() config.RGName = options.get("--resourceGroup") config.VMName = options.get("--plug") config.SubscriptionId = options.get("--subscriptionId") config.Cloud = options.get("--cloud") config.UseMSI = "--msi" in options config.Tenantid = options.get("--tenantId") config.ApplicationId = options.get("--username") config.ApplicationKey = options.get("--password") config.Verbose = options.get("--verbose") if not config.RGName: logging.info("resourceGroup not provided. Using metadata service") config.RGName = get_from_metadata("resourceGroupName") if not config.SubscriptionId: logging.info("subscriptionId not provided. Using metadata service") config.SubscriptionId = get_from_metadata("subscriptionId") return config def get_azure_cloud_environment(config): cloud_environment = None if config.Cloud: if (config.Cloud.lower() == "china"): from msrestazure.azure_cloud import AZURE_CHINA_CLOUD cloud_environment = AZURE_CHINA_CLOUD elif (config.Cloud.lower() == "germany"): from msrestazure.azure_cloud import AZURE_GERMAN_CLOUD cloud_environment = AZURE_GERMAN_CLOUD elif (config.Cloud.lower() == "usgov"): from msrestazure.azure_cloud import AZURE_US_GOV_CLOUD cloud_environment = AZURE_US_GOV_CLOUD return cloud_environment def get_azure_credentials(config): credentials = None cloud_environment = get_azure_cloud_environment(config) if config.UseMSI and cloud_environment: from msrestazure.azure_active_directory import MSIAuthentication credentials = MSIAuthentication(cloud_environment=cloud_environment) elif config.UseMSI: from msrestazure.azure_active_directory import MSIAuthentication credentials = MSIAuthentication() elif cloud_environment: from azure.common.credentials import ServicePrincipalCredentials credentials = ServicePrincipalCredentials( client_id = config.ApplicationId, secret = config.ApplicationKey, tenant = config.Tenantid, cloud_environment=cloud_environment ) else: from azure.common.credentials import ServicePrincipalCredentials credentials = ServicePrincipalCredentials( client_id = config.ApplicationId, secret = config.ApplicationKey, tenant = config.Tenantid ) return credentials def get_azure_compute_client(config): from azure.mgmt.compute import ComputeManagementClient cloud_environment = get_azure_cloud_environment(config) credentials = get_azure_credentials(config) if cloud_environment: compute_client = ComputeManagementClient( credentials, config.SubscriptionId, base_url=cloud_environment.endpoints.resource_manager ) else: compute_client = ComputeManagementClient( credentials, config.SubscriptionId ) return compute_client def get_azure_network_client(config): from azure.mgmt.network import NetworkManagementClient cloud_environment = get_azure_cloud_environment(config) credentials = get_azure_credentials(config) if cloud_environment: network_client = NetworkManagementClient( credentials, config.SubscriptionId, base_url=cloud_environment.endpoints.resource_manager ) else: network_client = NetworkManagementClient( credentials, config.SubscriptionId ) return network_client