Merge remote-tracking branch 'origin/dev' into feature/2840_LOCAL_TERMINAL_COMMAND

This commit is contained in:
Archer Bowen
2024-09-20 12:38:22 +01:00
77 changed files with 13581 additions and 266 deletions

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@@ -350,7 +350,6 @@ def install_stuff_to_sim(sim: Simulation):
network.connect(endpoint_a=server_2.network_interface[1], endpoint_b=switch_2.network_interface[2])
# 2: Configure base ACL
router.acl.add_rule(action=ACLAction.PERMIT, src_port=Port.ARP, dst_port=Port.ARP, position=22)
router.acl.add_rule(action=ACLAction.PERMIT, protocol=IPProtocol.ICMP, position=23)
router.acl.add_rule(action=ACLAction.PERMIT, src_port=Port.DNS, dst_port=Port.DNS, position=1)
router.acl.add_rule(action=ACLAction.PERMIT, src_port=Port.HTTP, dst_port=Port.HTTP, position=3)
@@ -382,8 +381,6 @@ def install_stuff_to_sim(sim: Simulation):
assert acl_rule.src_port == acl_rule.dst_port == Port.DNS
elif i == 3:
assert acl_rule.src_port == acl_rule.dst_port == Port.HTTP
elif i == 22:
assert acl_rule.src_port == acl_rule.dst_port == Port.ARP
elif i == 23:
assert acl_rule.protocol == IPProtocol.ICMP
elif i == 24:
@@ -463,6 +460,8 @@ def game_and_agent():
{"type": "C2_SERVER_RANSOMWARE_CONFIGURE"},
{"type": "C2_SERVER_TERMINAL_COMMAND"},
{"type": "C2_SERVER_DATA_EXFILTRATE"},
{"type": "NODE_ACCOUNTS_ADD_USER"},
{"type": "NODE_ACCOUNTS_DISABLE_USER"},
{"type": "NODE_ACCOUNTS_CHANGE_PASSWORD"},
{"type": "SSH_TO_REMOTE"},
{"type": "SESSIONS_REMOTE_LOGOFF"},

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@@ -0,0 +1,176 @@
# © Crown-owned copyright 2024, Defence Science and Technology Laboratory UK
import pytest
from primaite.simulator.network.hardware.nodes.host.computer import Computer
from primaite.simulator.network.hardware.nodes.network.router import ACLAction
from primaite.simulator.network.transmission.transport_layer import Port
@pytest.fixture
def game_and_agent_fixture(game_and_agent):
"""Create a game with a simple agent that can be controlled by the tests."""
game, agent = game_and_agent
client_1: Computer = game.simulation.network.get_node_by_hostname("client_1")
client_1.start_up_duration = 3
return (game, agent)
def test_user_account_add_user_action(game_and_agent_fixture):
"""Tests the add user account action."""
game, agent = game_and_agent_fixture
client_1 = game.simulation.network.get_node_by_hostname("client_1")
assert len(client_1.user_manager.users) == 1 # admin is created by default
assert len(client_1.user_manager.admins) == 1
# add admin account
action = (
"NODE_ACCOUNTS_ADD_USER",
{"node_id": 0, "username": "admin_2", "password": "e-tronic-boogaloo", "is_admin": True},
)
agent.store_action(action)
game.step()
assert len(client_1.user_manager.users) == 2 # new user added
assert len(client_1.user_manager.admins) == 2
# add non admin account
action = (
"NODE_ACCOUNTS_ADD_USER",
{"node_id": 0, "username": "leeroy.jenkins", "password": "no_plan_needed", "is_admin": False},
)
agent.store_action(action)
game.step()
assert len(client_1.user_manager.users) == 3 # new user added
assert len(client_1.user_manager.admins) == 2
def test_user_account_disable_user_action(game_and_agent_fixture):
"""Tests the disable user account action."""
game, agent = game_and_agent_fixture
client_1 = game.simulation.network.get_node_by_hostname("client_1")
client_1.user_manager.add_user(username="test", password="password", is_admin=True)
assert len(client_1.user_manager.users) == 2 # new user added
assert len(client_1.user_manager.admins) == 2
test_user = client_1.user_manager.users.get("test")
assert test_user
assert test_user.disabled is not True
# disable test account
action = (
"NODE_ACCOUNTS_DISABLE_USER",
{
"node_id": 0,
"username": "test",
},
)
agent.store_action(action)
game.step()
assert test_user.disabled
def test_user_account_change_password_action(game_and_agent_fixture):
"""Tests the change password user account action."""
game, agent = game_and_agent_fixture
client_1 = game.simulation.network.get_node_by_hostname("client_1")
client_1.user_manager.add_user(username="test", password="password", is_admin=True)
test_user = client_1.user_manager.users.get("test")
assert test_user.password == "password"
# change account password
action = (
"NODE_ACCOUNTS_CHANGE_PASSWORD",
{"node_id": 0, "username": "test", "current_password": "password", "new_password": "2Hard_2_Hack"},
)
agent.store_action(action)
game.step()
assert test_user.password == "2Hard_2_Hack"
def test_user_account_create_terminal_action(game_and_agent_fixture):
"""Tests that agents can use the terminal to create new users."""
game, agent = game_and_agent_fixture
router = game.simulation.network.get_node_by_hostname("router")
router.acl.add_rule(action=ACLAction.PERMIT, src_port=Port.SSH, dst_port=Port.SSH, position=4)
server_1 = game.simulation.network.get_node_by_hostname("server_1")
server_1_usm = server_1.software_manager.software["UserManager"]
server_1_usm.add_user("user123", "password", is_admin=True)
action = (
"SSH_TO_REMOTE",
{
"node_id": 0,
"username": "user123",
"password": "password",
"remote_ip": str(server_1.network_interface[1].ip_address),
},
)
agent.store_action(action)
game.step()
assert agent.history[-1].response.status == "success"
# Create a new user account via terminal.
action = (
"NODE_SEND_REMOTE_COMMAND",
{
"node_id": 0,
"remote_ip": str(server_1.network_interface[1].ip_address),
"command": ["service", "UserManager", "add_user", "new_user", "new_pass", True],
},
)
agent.store_action(action)
game.step()
new_user = server_1.user_manager.users.get("new_user")
assert new_user
assert new_user.password == "new_pass"
assert new_user.disabled is not True
def test_user_account_disable_terminal_action(game_and_agent_fixture):
"""Tests that agents can use the terminal to disable users."""
game, agent = game_and_agent_fixture
router = game.simulation.network.get_node_by_hostname("router")
router.acl.add_rule(action=ACLAction.PERMIT, src_port=Port.SSH, dst_port=Port.SSH, position=4)
server_1 = game.simulation.network.get_node_by_hostname("server_1")
server_1_usm = server_1.software_manager.software["UserManager"]
server_1_usm.add_user("user123", "password", is_admin=True)
action = (
"SSH_TO_REMOTE",
{
"node_id": 0,
"username": "user123",
"password": "password",
"remote_ip": str(server_1.network_interface[1].ip_address),
},
)
agent.store_action(action)
game.step()
assert agent.history[-1].response.status == "success"
# Disable a user via terminal
action = (
"NODE_SEND_REMOTE_COMMAND",
{
"node_id": 0,
"remote_ip": str(server_1.network_interface[1].ip_address),
"command": ["service", "UserManager", "disable_user", "user123"],
},
)
agent.store_action(action)
game.step()
new_user = server_1.user_manager.users.get("user123")
assert new_user
assert new_user.disabled is True

View File

@@ -77,6 +77,14 @@ def test_nic(simulation):
nic_obs = NICObservation(where=["network", "nodes", pc.hostname, "NICs", 1], include_nmne=True)
# The Simulation object created by the fixture also creates the
# NICObservation class with the NICObservation.capture_nmnme class variable
# set to False. Under normal (non-test) circumstances this class variable
# is set from a config file such as data_manipulation.yaml. So although
# capture_nmne is set to True in the NetworkInterface class it's still False
# in the NICObservation class so we set it now.
nic_obs.capture_nmne = True
# Set the NMNE configuration to capture DELETE/ENCRYPT queries as MNEs
nmne_config = {
"capture_nmne": True, # Enable the capture of MNEs

View File

@@ -39,6 +39,8 @@ def test_host_observation(simulation):
folders=[],
network_interfaces=[],
file_system_requires_scan=True,
services_requires_scan=True,
applications_requires_scan=True,
include_users=False,
)

View File

@@ -29,7 +29,9 @@ def test_service_observation(simulation):
ntp_server = pc.software_manager.software.get("NTPServer")
assert ntp_server
service_obs = ServiceObservation(where=["network", "nodes", pc.hostname, "services", "NTPServer"])
service_obs = ServiceObservation(
where=["network", "nodes", pc.hostname, "services", "NTPServer"], services_requires_scan=True
)
assert service_obs.space["operating_status"] == spaces.Discrete(7)
assert service_obs.space["health_status"] == spaces.Discrete(5)
@@ -54,7 +56,9 @@ def test_application_observation(simulation):
web_browser: WebBrowser = pc.software_manager.software.get("WebBrowser")
assert web_browser
app_obs = ApplicationObservation(where=["network", "nodes", pc.hostname, "applications", "WebBrowser"])
app_obs = ApplicationObservation(
where=["network", "nodes", pc.hostname, "applications", "WebBrowser"], applications_requires_scan=True
)
web_browser.close()
observation_state = app_obs.observe(simulation.describe_state())

View File

@@ -7,6 +7,7 @@ import yaml
from primaite.config.load import data_manipulation_config_path
from primaite.game.agent.interface import AgentHistoryItem
from primaite.session.environment import PrimaiteGymEnv
from primaite.simulator import SIM_OUTPUT
@pytest.fixture()
@@ -33,6 +34,11 @@ def test_rng_seed_set(create_env):
assert a == b
# Check that seed log file was created.
path = SIM_OUTPUT.path / "seed.log"
with open(path, "r") as file:
assert file
def test_rng_seed_unset(create_env):
"""Test with no RNG seed."""
@@ -48,3 +54,19 @@ def test_rng_seed_unset(create_env):
b = [item.timestep for item in env.game.agents["client_2_green_user"].history if item.action != "DONOTHING"]
assert a != b
def test_for_generated_seed():
"""
Show that setting generate_seed_value to true producess a valid seed.
"""
with open(data_manipulation_config_path(), "r") as f:
cfg = yaml.safe_load(f)
cfg["game"]["generate_seed_value"] = True
PrimaiteGymEnv(env_config=cfg)
path = SIM_OUTPUT.path / "seed.log"
with open(path, "r") as file:
data = file.read()
assert data.split(" ")[3] != None

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@@ -0,0 +1,21 @@
# © Crown-owned copyright 2024, Defence Science and Technology Laboratory UK
from typing import Tuple
from primaite.game.agent.interface import ProxyAgent
from primaite.game.game import PrimaiteGame
from tests import TEST_ASSETS_ROOT
FIREWALL_ACTIONS_NETWORK = TEST_ASSETS_ROOT / "configs/firewall_actions_network.yaml"
def test_router_acl_add_rule_action_shape(game_and_agent: Tuple[PrimaiteGame, ProxyAgent]):
"""Test to check ROUTER_ADD_ACL_RULE has the expected action shape."""
game, agent = game_and_agent
# assert that the shape of the actions is correct
router_acl_add_rule_action = agent.action_manager.actions.get("ROUTER_ACL_ADDRULE")
assert router_acl_add_rule_action.shape.get("source_ip_id") == len(agent.action_manager.ip_address_list)
assert router_acl_add_rule_action.shape.get("dest_ip_id") == len(agent.action_manager.ip_address_list)
assert router_acl_add_rule_action.shape.get("source_port_id") == len(agent.action_manager.ports)
assert router_acl_add_rule_action.shape.get("dest_port_id") == len(agent.action_manager.ports)
assert router_acl_add_rule_action.shape.get("protocol_id") == len(agent.action_manager.protocols)

View File

@@ -106,7 +106,7 @@ def test_router_acl_addrule_integration(game_and_agent: Tuple[PrimaiteGame, Prox
"""
Test that the RouterACLAddRuleAction can form a request and that it is accepted by the simulation.
The ACL starts off with 4 rules, and we add a rule, and check that the ACL now has 5 rules.
The ACL starts off with 3 rules, and we add a rule, and check that the ACL now has 4 rules.
"""
game, agent = game_and_agent
@@ -115,7 +115,7 @@ def test_router_acl_addrule_integration(game_and_agent: Tuple[PrimaiteGame, Prox
server_1 = game.simulation.network.get_node_by_hostname("server_1")
server_2 = game.simulation.network.get_node_by_hostname("server_2")
router = game.simulation.network.get_node_by_hostname("router")
assert router.acl.num_rules == 4
assert router.acl.num_rules == 3
assert client_1.ping("10.0.2.3") # client_1 can ping server_2
assert server_2.ping("10.0.1.2") # server_2 can ping client_1
@@ -138,8 +138,8 @@ def test_router_acl_addrule_integration(game_and_agent: Tuple[PrimaiteGame, Prox
agent.store_action(action)
game.step()
# 3: Check that the ACL now has 5 rules, and that client 1 cannot ping server 2
assert router.acl.num_rules == 5
# 3: Check that the ACL now has 4 rules, and that client 1 cannot ping server 2
assert router.acl.num_rules == 4
assert not client_1.ping("10.0.2.3") # Cannot ping server_2
assert client_1.ping("10.0.2.2") # Can ping server_1
assert not server_2.ping(
@@ -165,8 +165,8 @@ def test_router_acl_addrule_integration(game_and_agent: Tuple[PrimaiteGame, Prox
agent.store_action(action)
game.step()
# 5: Check that the ACL now has 6 rules, but that server_1 can still ping server_2
assert router.acl.num_rules == 6
# 5: Check that the ACL now has 5 rules, but that server_1 can still ping server_2
assert router.acl.num_rules == 5
assert server_1.ping("10.0.2.3") # Can ping server_2
@@ -195,8 +195,8 @@ def test_router_acl_removerule_integration(game_and_agent: Tuple[PrimaiteGame, P
agent.store_action(action)
game.step()
# 3: Check that the ACL now has 3 rules, and that client 1 cannot access example.com
assert router.acl.num_rules == 3
# 3: Check that the ACL now has 2 rules, and that client 1 cannot access example.com
assert router.acl.num_rules == 2
assert not browser.get_webpage()
client_1.software_manager.software.get("DNSClient").dns_cache.clear()
assert client_1.ping("10.0.2.2") # pinging still works because ICMP is allowed

View File

@@ -1,5 +1,11 @@
# © Crown-owned copyright 2024, Defence Science and Technology Laboratory UK
from itertools import product
import yaml
from primaite.config.load import data_manipulation_config_path
from primaite.game.agent.observations.nic_observations import NICObservation
from primaite.session.environment import PrimaiteGymEnv
from primaite.simulator.network.container import Network
from primaite.simulator.network.hardware.nodes.host.host_node import NIC
from primaite.simulator.network.hardware.nodes.host.server import Server
@@ -277,3 +283,19 @@ def test_capture_nmne_observations(uc2_network: Network):
assert web_nic_obs["outbound"] == expected_nmne
assert db_nic_obs["inbound"] == expected_nmne
uc2_network.apply_timestep(timestep=0)
def test_nmne_parameter_settings():
"""
Check that the four permutations of the values of capture_nmne and
include_nmne work as expected.
"""
with open(data_manipulation_config_path(), "r") as f:
cfg = yaml.safe_load(f)
DEFENDER = 3
for capture, include in product([True, False], [True, False]):
cfg["simulation"]["network"]["nmne_config"]["capture_nmne"] = capture
cfg["agents"][DEFENDER]["observation_space"]["options"]["components"][0]["options"]["include_nmne"] = include
PrimaiteGymEnv(env_config=cfg)

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@@ -73,7 +73,6 @@ def multi_hop_network() -> Network:
router_1.enable_port(2)
# Configure Router 1 ACLs
router_1.acl.add_rule(action=ACLAction.PERMIT, src_port=Port.ARP, dst_port=Port.ARP, position=22)
router_1.acl.add_rule(action=ACLAction.PERMIT, protocol=IPProtocol.ICMP, position=23)
# Configure PC B

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@@ -37,7 +37,6 @@ def wireless_wan_network():
network.connect(pc_a.network_interface[1], router_1.network_interface[2])
# Configure Router 1 ACLs
router_1.acl.add_rule(action=ACLAction.PERMIT, src_port=Port.ARP, dst_port=Port.ARP, position=22)
router_1.acl.add_rule(action=ACLAction.PERMIT, protocol=IPProtocol.ICMP, position=23)
# Configure PC B

View File

@@ -1,5 +1,7 @@
# © Crown-owned copyright 2024, Defence Science and Technology Laboratory UK
from primaite.simulator.network.hardware.nodes.network.router import RouterARP
from primaite.simulator.network.hardware.nodes.network.router import ACLAction, Router, RouterARP
from primaite.simulator.network.transmission.network_layer import IPProtocol
from primaite.simulator.network.transmission.transport_layer import Port
from primaite.simulator.system.services.arp.arp import ARP
from tests.integration_tests.network.test_routing import multi_hop_network
@@ -48,3 +50,19 @@ def test_arp_fails_for_network_address_between_routers(multi_hop_network):
actual_result = router_1_arp.get_arp_cache_mac_address(router_1.network_interface[1].ip_network.network_address)
assert actual_result == expected_result
def test_arp_not_affected_by_acl(multi_hop_network):
pc_a = multi_hop_network.get_node_by_hostname("pc_a")
router_1: Router = multi_hop_network.get_node_by_hostname("router_1")
# Add explicit rule to block ARP traffic. This shouldn't actually stop ARP traffic
# as it operates a different layer within the network.
router_1.acl.add_rule(action=ACLAction.DENY, src_port=Port.ARP, dst_port=Port.ARP, position=23)
pc_a_arp: ARP = pc_a.software_manager.arp
expected_result = router_1.network_interface[2].mac_address
actual_result = pc_a_arp.get_arp_cache_mac_address(router_1.network_interface[2].ip_address)
assert actual_result == expected_result

View File

@@ -1,10 +1,11 @@
# © Crown-owned copyright 2024, Defence Science and Technology Laboratory UK
import json
from typing import List
import pytest
import yaml
from primaite.game.agent.observations import ObservationManager
from primaite.game.agent.observations import ApplicationObservation, ObservationManager, ServiceObservation
from primaite.game.agent.observations.file_system_observations import FileObservation, FolderObservation
from primaite.game.agent.observations.host_observations import HostObservation
@@ -130,3 +131,227 @@ class TestFileSystemRequiresScan:
[], files=[], num_files=0, include_num_access=False, file_system_requires_scan=False
)
assert obs_not_requiring_scan.observe(folder_state)["health_status"] == 3
class TestServicesRequiresScan:
@pytest.mark.parametrize(
("yaml_option_string", "expected_val"),
(
("services_requires_scan: true", True),
("services_requires_scan: false", False),
(" ", True),
),
)
def test_obs_config(self, yaml_option_string, expected_val):
"""Check that the default behaviour is to set service_requires_scan to True."""
obs_cfg_yaml = f"""
type: CUSTOM
options:
components:
- type: NODES
label: NODES
options:
hosts:
- hostname: domain_controller
- hostname: web_server
services:
- service_name: WebServer
- service_name: DNSClient
- hostname: database_server
folders:
- folder_name: database
files:
- file_name: database.db
- hostname: backup_server
services:
- service_name: FTPServer
- hostname: security_suite
- hostname: client_1
- hostname: client_2
num_services: 3
num_applications: 0
num_folders: 1
num_files: 1
num_nics: 2
include_num_access: false
{yaml_option_string}
include_nmne: true
monitored_traffic:
icmp:
- NONE
tcp:
- DNS
routers:
- hostname: router_1
num_ports: 0
ip_list:
- 192.168.1.10
- 192.168.1.12
- 192.168.1.14
- 192.168.1.16
- 192.168.1.110
- 192.168.10.21
- 192.168.10.22
- 192.168.10.110
wildcard_list:
- 0.0.0.1
port_list:
- 80
- 5432
protocol_list:
- ICMP
- TCP
- UDP
num_rules: 10
- type: LINKS
label: LINKS
options:
link_references:
- router_1:eth-1<->switch_1:eth-8
- router_1:eth-2<->switch_2:eth-8
- switch_1:eth-1<->domain_controller:eth-1
- switch_1:eth-2<->web_server:eth-1
- switch_1:eth-3<->database_server:eth-1
- switch_1:eth-4<->backup_server:eth-1
- switch_1:eth-7<->security_suite:eth-1
- switch_2:eth-1<->client_1:eth-1
- switch_2:eth-2<->client_2:eth-1
- switch_2:eth-7<->security_suite:eth-2
- type: "NONE"
label: ICS
options: {{}}
"""
cfg = yaml.safe_load(obs_cfg_yaml)
manager = ObservationManager.from_config(cfg)
hosts: List[HostObservation] = manager.obs.components["NODES"].hosts
for i, host in enumerate(hosts):
services: List[ServiceObservation] = host.services
for j, service in enumerate(services):
val = service.services_requires_scan
print(f"host {i} service {j} {val}")
assert val == expected_val # Make sure services require scan by default
def test_services_requires_scan(self):
state = {"health_state_actual": 3, "health_state_visible": 1, "operating_state": 1}
obs_requiring_scan = ServiceObservation([], services_requires_scan=True)
assert obs_requiring_scan.observe(state)["health_status"] == 1 # should be visible value
obs_not_requiring_scan = ServiceObservation([], services_requires_scan=False)
assert obs_not_requiring_scan.observe(state)["health_status"] == 3 # should be actual value
class TestApplicationsRequiresScan:
@pytest.mark.parametrize(
("yaml_option_string", "expected_val"),
(
("applications_requires_scan: true", True),
("applications_requires_scan: false", False),
(" ", True),
),
)
def test_obs_config(self, yaml_option_string, expected_val):
"""Check that the default behaviour is to set applications_requires_scan to True."""
obs_cfg_yaml = f"""
type: CUSTOM
options:
components:
- type: NODES
label: NODES
options:
hosts:
- hostname: domain_controller
- hostname: web_server
- hostname: database_server
folders:
- folder_name: database
files:
- file_name: database.db
- hostname: backup_server
- hostname: security_suite
- hostname: client_1
applications:
- application_name: WebBrowser
- hostname: client_2
applications:
- application_name: WebBrowser
- application_name: DatabaseClient
num_services: 0
num_applications: 3
num_folders: 1
num_files: 1
num_nics: 2
include_num_access: false
{yaml_option_string}
include_nmne: true
monitored_traffic:
icmp:
- NONE
tcp:
- DNS
routers:
- hostname: router_1
num_ports: 0
ip_list:
- 192.168.1.10
- 192.168.1.12
- 192.168.1.14
- 192.168.1.16
- 192.168.1.110
- 192.168.10.21
- 192.168.10.22
- 192.168.10.110
wildcard_list:
- 0.0.0.1
port_list:
- 80
- 5432
protocol_list:
- ICMP
- TCP
- UDP
num_rules: 10
- type: LINKS
label: LINKS
options:
link_references:
- router_1:eth-1<->switch_1:eth-8
- router_1:eth-2<->switch_2:eth-8
- switch_1:eth-1<->domain_controller:eth-1
- switch_1:eth-2<->web_server:eth-1
- switch_1:eth-3<->database_server:eth-1
- switch_1:eth-4<->backup_server:eth-1
- switch_1:eth-7<->security_suite:eth-1
- switch_2:eth-1<->client_1:eth-1
- switch_2:eth-2<->client_2:eth-1
- switch_2:eth-7<->security_suite:eth-2
- type: "NONE"
label: ICS
options: {{}}
"""
cfg = yaml.safe_load(obs_cfg_yaml)
manager = ObservationManager.from_config(cfg)
hosts: List[HostObservation] = manager.obs.components["NODES"].hosts
for i, host in enumerate(hosts):
services: List[ServiceObservation] = host.services
for j, service in enumerate(services):
val = service.services_requires_scan
print(f"host {i} service {j} {val}")
assert val == expected_val # Make sure applications require scan by default
def test_applications_requires_scan(self):
state = {"health_state_actual": 3, "health_state_visible": 1, "operating_state": 1, "num_executions": 1}
obs_requiring_scan = ApplicationObservation([], applications_requires_scan=True)
assert obs_requiring_scan.observe(state)["health_status"] == 1 # should be visible value
obs_not_requiring_scan = ApplicationObservation([], applications_requires_scan=False)
assert obs_not_requiring_scan.observe(state)["health_status"] == 3 # should be actual value

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@@ -77,7 +77,6 @@ def wireless_wan_network():
network.connect(pc_a.network_interface[1], router_1.network_interface[2])
# Configure Router 1 ACLs
router_1.acl.add_rule(action=ACLAction.PERMIT, src_port=Port.ARP, dst_port=Port.ARP, position=22)
router_1.acl.add_rule(action=ACLAction.PERMIT, protocol=IPProtocol.ICMP, position=23)
# add ACL rule to allow SSH traffic