You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 

244 lines
6.2 KiB

# Test that a box's fail2ban setting are working
# correctly by attempting a bunch of failed logins.
#
# Specify a SSH login command (which we use to reset
# fail2ban after each test) and the hostname to
# try to log in to.
######################################################################
import sys, os, time, functools
# parse command line
if len(sys.argv) != 4:
print("Usage: tests/fail2ban.py \"ssh user@hostname\" hostname owncloud_user")
sys.exit(1)
ssh_command, hostname, owncloud_user = sys.argv[1:4]
# define some test types
import socket
socket.setdefaulttimeout(10)
class IsBlocked(Exception):
"""Tests raise this exception when it appears that a fail2ban
jail is in effect, i.e. on a connection refused error."""
pass
def smtp_test():
import smtplib
try:
server = smtplib.SMTP(hostname, 587)
except ConnectionRefusedError:
# looks like fail2ban worked
raise IsBlocked()
server.starttls()
server.ehlo_or_helo_if_needed()
try:
server.login("fakeuser", "fakepassword")
raise Exception("authentication didn't fail")
except smtplib.SMTPAuthenticationError:
# athentication should fail
pass
try:
server.quit()
except:
# ignore errors here
pass
def imap_test():
import imaplib
try:
M = imaplib.IMAP4_SSL(hostname)
except ConnectionRefusedError:
# looks like fail2ban worked
raise IsBlocked()
try:
M.login("fakeuser", "fakepassword")
raise Exception("authentication didn't fail")
except imaplib.IMAP4.error:
# authentication should fail
pass
finally:
M.logout() # shuts down connection, has nothing to do with login()
def pop_test():
import poplib
try:
M = poplib.POP3_SSL(hostname)
except ConnectionRefusedError:
# looks like fail2ban worked
raise IsBlocked()
try:
M.user('fakeuser')
try:
M.pass_('fakepassword')
except poplib.error_proto as e:
# Authentication should fail.
M = None # don't .quit()
return
M.list()
raise Exception("authentication didn't fail")
finally:
if M:
M.quit()
def managesieve_test():
# We don't have a Python sieve client, so we'll
# just run the IMAP client and see what happens.
import imaplib
try:
M = imaplib.IMAP4(hostname, 4190)
except ConnectionRefusedError:
# looks like fail2ban worked
raise IsBlocked()
try:
M.login("fakeuser", "fakepassword")
raise Exception("authentication didn't fail")
except imaplib.IMAP4.error:
# authentication should fail
pass
finally:
M.logout() # shuts down connection, has nothing to do with login()
def http_test(url, expected_status, postdata=None, qsargs=None, auth=None):
import urllib.parse
import requests
from requests.auth import HTTPBasicAuth
# form request
url = urllib.parse.urljoin("https://" + hostname, url)
if qsargs: url += "?" + urllib.parse.urlencode(qsargs)
urlopen = requests.get if not postdata else requests.post
try:
# issue request
r = urlopen(
url,
auth=HTTPBasicAuth(*auth) if auth else None,
data=postdata,
headers={'User-Agent': 'Mail-in-a-Box fail2ban tester'},
timeout=8,
verify=False) # don't bother with HTTPS validation, it may not be configured yet
except requests.exceptions.ConnectTimeout as e:
raise IsBlocked()
except requests.exceptions.ConnectionError as e:
if "Connection refused" in str(e):
raise IsBlocked()
raise # some other unexpected condition
# return response status code
if r.status_code != expected_status:
r.raise_for_status() # anything but 200
raise IOError("Got unexpected status code %s." % r.status_code)
# define how to run a test
def restart_fail2ban_service(final=False):
# Log in over SSH to restart fail2ban.
command = "sudo fail2ban-client reload"
if not final:
# Stop recidive jails during testing.
command += " && sudo fail2ban-client stop recidive"
os.system("%s \"%s\"" % (ssh_command, command))
def testfunc_runner(i, testfunc, *args):
print(i+1, end=" ", flush=True)
testfunc(*args)
def run_test(testfunc, args, count, within_seconds, parallel):
# Run testfunc count times in within_seconds seconds (and actually
# within a little less time so we're sure we're under the limit).
#
# Because some services are slow, like IMAP, we can't necessarily
# run testfunc sequentially and still get to count requests within
# the required time. So we split the requests across threads.
import requests.exceptions
from multiprocessing import Pool
restart_fail2ban_service()
# Log.
print(testfunc.__name__, " ".join(str(a) for a in args), "...")
# Record the start time so we can know how to evenly space our
# calls to testfunc.
start_time = time.time()
with Pool(parallel) as p:
# Distribute the requests across the pool.
asyncresults = []
for i in range(count):
ar = p.apply_async(testfunc_runner, [i, testfunc] + list(args))
asyncresults.append(ar)
# Wait for all runs to finish.
p.close()
p.join()
# Check for errors.
for ar in asyncresults:
try:
ar.get()
except IsBlocked:
print("Test machine prematurely blocked!")
return False
# Did we make enough requests within the limit?
if (time.time()-start_time) > within_seconds:
raise Exception("Test failed to make %s requests in %d seconds." % (count, within_seconds))
# Wait a moment for the block to be put into place.
time.sleep(4)
# The next call should fail.
print("*", end=" ", flush=True)
try:
testfunc(*args)
except IsBlocked:
# Success -- this one is supposed to be refused.
print("blocked [OK]")
return True # OK
print("not blocked!")
return False
######################################################################
if __name__ == "__main__":
# run tests
# SMTP bans at 10 even though we say 20 in the config because we get
# doubled-up warnings in the logs, we'll let that be for now
run_test(smtp_test, [], 10, 30, 8)
# IMAP
run_test(imap_test, [], 20, 30, 4)
# POP
run_test(pop_test, [], 20, 30, 4)
# Managesieve
run_test(managesieve_test, [], 20, 30, 4)
# Mail-in-a-Box control panel
run_test(http_test, ["/admin/login", 200], 20, 30, 1)
# Munin via the Mail-in-a-Box control panel
run_test(http_test, ["/admin/munin/", 401], 20, 30, 1)
# ownCloud
run_test(http_test, ["/cloud/remote.php/webdav", 401, None, None, [owncloud_user, "aa"]], 20, 120, 1)
# restart fail2ban so that this client machine is no longer blocked
restart_fail2ban_service(final=True)