/usr/lib/python3/dist-packages/ufw/backend_iptables.py is in ufw 0.34~rc-0ubuntu2.
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1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 | '''backend_iptables.py: iptables backend for ufw'''
#
# Copyright 2008-2012 Canonical Ltd.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3,
# as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
import os
import re
import shutil
import stat
import sys
import time
from ufw.common import UFWError, UFWRule
from ufw.util import warn, debug, msg, cmd, cmd_pipe
import ufw.backend
class UFWBackendIptables(ufw.backend.UFWBackend):
'''Instance class for UFWBackend'''
def __init__(self, dryrun):
'''UFWBackendIptables initialization'''
self.comment_str = "# " + ufw.common.programName + "_comment #"
files = {}
files['rules'] = os.path.join(ufw.common.state_dir, 'user.rules')
files['before_rules'] = os.path.join(ufw.common.config_dir,
'ufw/before.rules')
files['after_rules'] = os.path.join(ufw.common.config_dir,
'ufw/after.rules')
files['rules6'] = os.path.join(ufw.common.state_dir,
'user6.rules')
files['before6_rules'] = os.path.join(ufw.common.config_dir,
'ufw/before6.rules')
files['after6_rules'] = os.path.join(ufw.common.config_dir,
'ufw/after6.rules')
files['init'] = os.path.join(ufw.common.state_dir, 'ufw-init')
ufw.backend.UFWBackend.__init__(self, "iptables", dryrun, files)
self.chains = {'before': [], 'user': [], 'after': [], 'misc': []}
for ver in ['4', '6']:
chain_prefix = "ufw"
if ver == "6":
if self.use_ipv6():
chain_prefix += ver
elif ver == "6":
continue
for loc in ['before', 'user', 'after']:
for target in ['input', 'output', 'forward']:
chain = "%s-%s-logging-%s" % (chain_prefix, loc, target)
self.chains[loc].append(chain)
self.chains['misc'].append(chain_prefix + "-logging-deny")
self.chains['misc'].append(chain_prefix + "-logging-allow")
# The default log rate limiting rule ('ufw[6]-user-limit chain should
# be prepended before use)
self.ufw_user_limit_log = ['-m', 'limit', \
'--limit', '3/minute', '-j', 'LOG', \
'--log-prefix']
self.ufw_user_limit_log_text = "[UFW LIMIT BLOCK]"
def get_default_application_policy(self):
'''Get current policy'''
rstr = _("New profiles:")
if self.defaults['default_application_policy'] == "accept":
rstr += " allow"
elif self.defaults['default_application_policy'] == "drop":
rstr += " deny"
elif self.defaults['default_application_policy'] == "reject":
rstr += " reject"
else:
rstr += " skip"
return rstr
def set_default_policy(self, policy, direction):
'''Sets default policy of firewall'''
if not self.dryrun:
if policy != "allow" and policy != "deny" and policy != "reject":
err_msg = _("Unsupported policy '%s'") % (policy)
raise UFWError(err_msg)
if direction != "incoming" and direction != "outgoing" and \
direction != "routed":
err_msg = _("Unsupported policy for direction '%s'") % \
(direction)
raise UFWError(err_msg)
chain = "INPUT"
if direction == "outgoing":
chain = "OUTPUT"
elif direction == "routed":
chain = "FORWARD"
old_log_str = ''
new_log_str = ''
if policy == "allow":
try:
self.set_default(self.files['defaults'], \
"DEFAULT_%s_POLICY" % (chain), \
"\"ACCEPT\"")
except Exception:
raise
old_log_str = 'UFW BLOCK'
new_log_str = 'UFW ALLOW'
elif policy == "reject":
try:
self.set_default(self.files['defaults'], \
"DEFAULT_%s_POLICY" % (chain), \
"\"REJECT\"")
except Exception:
raise
old_log_str = 'UFW ALLOW'
new_log_str = 'UFW BLOCK'
else:
try:
self.set_default(self.files['defaults'], \
"DEFAULT_%s_POLICY" % (chain), \
"\"DROP\"")
except Exception:
raise
old_log_str = 'UFW ALLOW'
new_log_str = 'UFW BLOCK'
# Switch logging message in catch-all rules
pat = re.compile(r'' + old_log_str)
for f in [self.files['after_rules'], self.files['after6_rules']]:
try:
fns = ufw.util.open_files(f)
except Exception:
raise
fd = fns['tmp']
for line in fns['orig']:
if pat.search(line):
ufw.util.write_to_file(fd, pat.sub(new_log_str, line))
else:
ufw.util.write_to_file(fd, line)
try:
ufw.util.close_files(fns)
except Exception:
raise
rstr = _("Default %(direction)s policy changed to '%(policy)s'\n") % \
({'direction': direction, 'policy': policy})
rstr += _("(be sure to update your rules accordingly)")
return rstr
def get_running_raw(self, rules_type):
'''Show current running status of firewall'''
if self.dryrun:
out = "> " + _("Checking raw iptables\n")
out += "> " + _("Checking raw ip6tables\n")
return out
# Initialize the capabilities database
self.initcaps()
args = ['-n', '-v', '-x', '-L']
items = []
items6 = []
if rules_type == "raw":
args.append('-t')
items = ['filter', 'nat', 'mangle', 'raw']
items6 = ['filter', 'mangle', 'raw']
elif rules_type == "builtins":
for c in ['INPUT', 'FORWARD', 'OUTPUT']:
items.append('filter:%s' % c)
items6.append('filter:%s' % c)
for c in ['PREROUTING', 'INPUT', 'FORWARD', 'OUTPUT', \
'POSTROUTING']:
items.append('mangle:%s' % c)
items6.append('mangle:%s' % c)
for c in ['PREROUTING', 'OUTPUT']:
items.append('raw:%s' % c)
items6.append('raw:%s' % c)
for c in ['PREROUTING', 'POSTROUTING', 'OUTPUT']:
items.append('nat:%s' % c)
elif rules_type == "before":
for b in ['input', 'forward', 'output']:
items.append('ufw-before-%s' % b)
items6.append('ufw6-before-%s' % b)
elif rules_type == "user":
for b in ['input', 'forward', 'output']:
items.append('ufw-user-%s' % b)
items6.append('ufw6-user-%s' % b)
if self.caps['limit']['4']:
items.append('ufw-user-limit-accept')
items.append('ufw-user-limit')
if self.caps['limit']['6']:
items6.append('ufw6-user-limit-accept')
items6.append('ufw6-user-limit')
elif rules_type == "after":
for b in ['input', 'forward', 'output']:
items.append('ufw-after-%s' % b)
items6.append('ufw6-after-%s' % b)
elif rules_type == "logging":
for b in ['input', 'forward', 'output']:
items.append('ufw-before-logging-%s' % b)
items6.append('ufw6-before-logging-%s' % b)
items.append('ufw-user-logging-%s' % b)
items6.append('ufw6-user-logging-%s' % b)
items.append('ufw-after-logging-%s' % b)
items6.append('ufw6-after-logging-%s' % b)
items.append('ufw-logging-allow')
items.append('ufw-logging-deny')
items6.append('ufw6-logging-allow')
items6.append('ufw6-logging-deny')
out = "IPV4 (%s):\n" % (rules_type)
for i in items:
if ':' in i:
(t, c) = i.split(':')
out += "(%s) " % (t)
(rc, tmp) = cmd([self.iptables] + args + [c, '-t', t])
else:
(rc, tmp) = cmd([self.iptables] + args + [i])
out += tmp
if rules_type != "raw":
out += "\n"
if rc != 0:
raise UFWError(out)
if rules_type == "raw" or self.use_ipv6():
out += "\n\nIPV6:\n"
for i in items6:
if ':' in i:
(t, c) = i.split(':')
out += "(%s) " % (t)
(rc, tmp) = cmd([self.iptables] + args + [c, '-t', t])
else:
(rc, tmp) = cmd([self.ip6tables] + args + [i])
out += tmp
if rules_type != "raw":
out += "\n"
if rc != 0:
raise UFWError(out)
return out
def get_status(self, verbose=False, show_count=False):
'''Show ufw managed rules'''
out = ""
if self.dryrun:
out = "> " + _("Checking iptables\n")
if self.use_ipv6():
out += "> " + _("Checking ip6tables\n")
return out
err_msg = _("problem running")
for direction in ["input", "output", "forward"]:
# Is the firewall loaded at all?
(rc, out) = cmd([self.iptables, '-L', \
'ufw-user-%s' % (direction), '-n'])
if rc == 1:
return _("Status: inactive")
elif rc != 0:
raise UFWError(err_msg + " iptables: %s\n" % (out))
if self.use_ipv6():
(rc, out6) = cmd([self.ip6tables, '-L', \
'ufw6-user-%s' % (direction), '-n'])
if rc != 0:
raise UFWError(err_msg + " ip6tables")
s = ""
str_out = ""
str_rte = ""
rules = self.rules + self.rules6
count = 1
app_rules = {}
for r in rules:
tmp_str = ""
location = {}
tupl = ""
show_proto = True
if not verbose and (r.dapp != "" or r.sapp != ""):
show_proto = False
tupl = r.get_app_tuple()
if tupl in app_rules:
debug("Skipping found tuple '%s'" % (tupl))
continue
else:
app_rules[tupl] = True
for loc in [ 'dst', 'src' ]:
location[loc] = ""
port = ""
tmp = ""
if loc == "dst":
tmp = r.dst
if not verbose and r.dapp != "":
port = r.dapp
if r.v6 and tmp == "::/0":
port += " (v6)"
else:
port = r.dport
else:
tmp = r.src
if not verbose and r.sapp != "":
port = r.sapp
if r.v6 and tmp == "::/0":
port += " (v6)"
else:
port = r.sport
if tmp != "0.0.0.0/0" and tmp != "::/0":
location[loc] = tmp
if port != "any":
if location[loc] == "":
location[loc] = port
else:
location[loc] += " " + port
if show_proto and r.protocol != "any":
location[loc] += "/" + r.protocol
if verbose:
if loc == "dst" and r.dapp != "":
location[loc] += " (%s" % (r.dapp)
if r.v6 and tmp == "::/0":
location[loc] += " (v6)"
location[loc] += ")"
if loc == "src" and r.sapp != "":
location[loc] += " (%s" % (r.sapp)
if r.v6 and tmp == "::/0":
location[loc] += " (v6)"
location[loc] += ")"
if port == "any":
if tmp == "0.0.0.0/0" or tmp == "::/0":
location[loc] = "Anywhere"
# Show the protocol if Anywhere to Anwhere, have
# protocol and source and dest ports are any
if show_proto and r.protocol != "any" and \
r.dst == r.src and r.dport == r.sport:
location[loc] += "/" + r.protocol
if tmp == "::/0":
location[loc] += " (v6)"
else:
# Show the protocol if have protocol, and source
# and dest ports are any
if show_proto and r.protocol != "any" and \
r.dport == r.sport:
location[loc] += "/" + r.protocol
elif r.v6 and r.src == "::/0" and r.dst == "::/0" \
and ' (v6)' not in location[loc]:
# Add v6 if have port but no addresses so it doesn't look
# a duplicate of the v4 rule
location[loc] += " (v6)"
# Reporting the interfaces is different in route rules and
# non-route rules. With route rules, the reporting should be
# relative to how packets flow through the firewall, with
# other rules the reporting should be relative to the firewall
# system as endpoint. As such, for route rules, report the
# incoming interface under 'From' and the outgoing interface
# under 'To', and for non-route rules, report the incoming
# interface under 'To', and the outgoing interface under
# 'From'.
if r.forward:
if loc == 'src' and r.interface_in != "":
location[loc] += " on %s" % (r.interface_in)
if loc == 'dst' and r.interface_out != "":
location[loc] += " on %s" % (r.interface_out)
else:
if loc == 'dst' and r.interface_in != "":
location[loc] += " on %s" % (r.interface_in)
if loc == 'src' and r.interface_out != "":
location[loc] += " on %s" % (r.interface_out)
attribs = []
attrib_str = ""
if r.logtype or r.direction.lower() == "out":
if r.logtype:
attribs.append(r.logtype.lower())
# why is the direction added to attribs if shown in action?
if show_count and r.direction == "out":
attribs.append(r.direction)
if len(attribs) > 0:
attrib_str = " (%s)" % (', '.join(attribs))
# now construct the rule output string
if show_count:
tmp_str += "[%2d] " % (count)
dir_str = r.direction.upper()
if r.forward:
dir_str = "FWD"
if r.direction == "in" and not r.forward and \
not verbose and not show_count:
dir_str = ""
tmp_str += "%-26s %-12s%s%s\n" % (location['dst'], \
" ".join([r.action.upper(), \
dir_str]), \
location['src'], attrib_str)
# Show the list in the order given if a numbered list, otherwise
# split incoming and outgoing rules
if show_count:
s += tmp_str
else:
if r.forward:
str_rte += tmp_str
elif r.direction == "out":
str_out += tmp_str
else:
s += tmp_str
count += 1
if s != "" or str_out != "" or str_rte != "":
full_str = "\n\n"
if show_count:
full_str += " "
str_to = _("To")
str_from = _("From")
str_action = _("Action")
rules_header_fmt = "%-26s %-12s%s\n"
rules_header = rules_header_fmt % (str_to, str_action, str_from)
if show_count:
rules_header += " "
rules_header += rules_header_fmt % \
("-" * len(str_to), \
"-" * len(str_action), \
"-" * len(str_from))
full_str += rules_header
if s != "":
full_str += s
if s != "" and str_out != "":
full_str += _("\n")
if str_out != "":
full_str += str_out
if s != "" and str_rte != "":
full_str += _("\n")
if str_rte != "":
full_str += str_rte
s = full_str
if verbose:
(level, logging_str) = self.get_loglevel()
policy_str = _("Default: %(in)s (incoming), " +
"%(out)s (outgoing), " +
"%(routed)s (routed)") \
% ({'in': self._get_default_policy(), \
'out': self._get_default_policy("output"), \
'routed': self._get_default_policy("forward", \
True)})
app_policy_str = self.get_default_application_policy()
return _("Status: active\n%(log)s\n%(pol)s\n%(app)s%(status)s") % \
({'log': logging_str, 'pol': policy_str, \
'app': app_policy_str, 'status': s})
else:
return _("Status: active%s") % (s)
def stop_firewall(self):
'''Stop the firewall'''
if self.dryrun:
msg("> " + _("running ufw-init"))
else:
(rc, out) = cmd([self.files['init'], 'force-stop'])
if rc != 0:
err_msg = _("problem running ufw-init\n%s" % out)
raise UFWError(err_msg)
def start_firewall(self):
'''Start the firewall'''
if self.dryrun:
msg("> " + _("running ufw-init"))
else:
(rc, out) = cmd([self.files['init'], 'start'])
if rc != 0:
err_msg = _("problem running ufw-init\n%s" % out)
raise UFWError(err_msg)
if 'loglevel' not in self.defaults or \
self.defaults['loglevel'] not in list(self.loglevels.keys()):
# Add the loglevel if not valid
try:
self.set_loglevel("low")
except Exception:
err_msg = _("Could not set LOGLEVEL")
raise UFWError(err_msg)
else:
try:
self.update_logging(self.defaults['loglevel'])
except Exception:
err_msg = _("Could not load logging rules")
raise UFWError(err_msg)
def _need_reload(self, v6):
'''Check if all chains exist'''
if self.dryrun:
return False
# Initialize the capabilities database
self.initcaps()
prefix = "ufw"
exe = self.iptables
if v6:
prefix = "ufw6"
exe = self.ip6tables
for chain in [ 'input', 'output', 'forward', 'limit', 'limit-accept' ]:
if chain == "limit" or chain == "limit-accept":
if v6 and not self.caps['limit']['6']:
continue
elif not v6 and not self.caps['limit']['4']:
continue
(rc, out) = cmd([exe, '-n', '-L', prefix + "-user-" + chain])
if rc != 0:
debug("_need_reload: forcing reload")
return True
return False
def _reload_user_rules(self):
'''Reload firewall rules file'''
err_msg = _("problem running")
if self.dryrun:
msg("> | iptables-restore")
if self.use_ipv6():
msg("> | ip6tables-restore")
elif self.is_enabled():
# first flush the user logging chains
try:
for c in self.chains['user']:
self._chain_cmd(c, ['-F', c])
self._chain_cmd(c, ['-Z', c])
except Exception: # pragma: no coverage
raise UFWError(err_msg)
# then restore the system rules
(rc, out) = cmd_pipe(['cat', self.files['rules']], \
[self.iptables_restore, '-n'])
if rc != 0:
raise UFWError(err_msg + " iptables")
if self.use_ipv6():
(rc, out) = cmd_pipe(['cat', self.files['rules6']], \
[self.ip6tables_restore, '-n'])
if rc != 0:
raise UFWError(err_msg + " ip6tables")
def _get_rules_from_formatted(self, frule, prefix, suffix):
'''Return list of iptables rules appropriate for sending'''
snippets = []
# adjust reject and protocol 'all'
pat_proto = re.compile(r'-p all ')
pat_port = re.compile(r'port ')
pat_reject = re.compile(r'-j (REJECT(_log(-all)?)?)')
if pat_proto.search(frule):
if pat_port.search(frule):
if pat_reject.search(frule):
snippets.append(pat_proto.sub('-p tcp ', \
pat_reject.sub(r'-j \1 --reject-with tcp-reset', \
frule)))
else:
snippets.append(pat_proto.sub('-p tcp ', frule))
snippets.append(pat_proto.sub('-p udp ', frule))
else:
snippets.append(pat_proto.sub('', frule))
else:
snippets.append(frule)
# adjust for logging rules
pat_log = re.compile(r'(.*)-j ([A-Z]+)_log(-all)?(.*)')
pat_logall = re.compile(r'-j [A-Z]+_log-all')
pat_chain = re.compile(r'(-A|-D) ([a-zA-Z0-9\-]+)')
limit_args = '-m limit --limit 3/min --limit-burst 10'
for i, s in enumerate(snippets):
if pat_log.search(s):
policy = pat_log.sub(r'\2', s).strip()
if policy.lower() == "accept":
policy = "ALLOW"
elif policy.lower() == "limit":
policy = "LIMIT"
else:
policy = "BLOCK"
lstr = '%s -j LOG --log-prefix "[UFW %s] "' % (limit_args, \
policy)
if not pat_logall.search(s):
lstr = '-m conntrack --ctstate NEW ' + lstr
snippets[i] = pat_log.sub(r'\1-j \2\4', s)
snippets.insert(i, pat_log.sub(r'\1-j ' + prefix + \
'-user-logging-' + suffix, s))
snippets.insert(i, pat_chain.sub(r'\1 ' + prefix + \
'-user-logging-' + suffix,
pat_log.sub(r'\1-j RETURN', \
s)))
snippets.insert(i, pat_chain.sub(r'\1 ' + prefix + \
'-user-logging-' + suffix,
pat_log.sub(r'\1' + lstr, s)))
# adjust for limit
pat_limit = re.compile(r' -j LIMIT')
for i, s in enumerate(snippets):
if pat_limit.search(s):
tmp1 = pat_limit.sub(' -m conntrack --ctstate NEW -m recent --set', \
s)
tmp2 = pat_limit.sub(' -m conntrack --ctstate NEW -m recent' + \
' --update --seconds 30 --hitcount 6' + \
' -j ' + prefix + '-user-limit', s)
tmp3 = pat_limit.sub(' -j ' + prefix + '-user-limit-accept', s)
snippets[i] = tmp3
snippets.insert(i, tmp2)
snippets.insert(i, tmp1)
return snippets
def _get_lists_from_formatted(self, frule, prefix, suffix):
'''Return list of iptables rules appropriate for sending as arguments
to cmd()
'''
snippets = []
str_snippets = self._get_rules_from_formatted(frule, prefix, suffix)
# split the string such that the log prefix can contain spaces
pat = re.compile(r'(.*) --log-prefix (".* ")(.*)')
for i, s in enumerate(str_snippets):
snippets.append(pat.sub(r'\1', s).split())
if pat.match(s):
snippets[i].append("--log-prefix")
snippets[i].append(pat.sub(r'\2', s).replace('"', ''))
snippets[i] += pat.sub(r'\3', s).split()
return snippets
def _read_rules(self):
'''Read in rules that were added by ufw'''
rfns = [self.files['rules']]
if self.use_ipv6():
rfns.append(self.files['rules6'])
for f in rfns:
try:
orig = ufw.util.open_file_read(f)
except Exception:
err_msg = _("Couldn't open '%s' for reading") % (f)
raise UFWError(err_msg)
pat_tuple = re.compile(r'^### tuple ###\s*')
pat_iface_in = re.compile(r'in_\w+')
pat_iface_out = re.compile(r'out_\w+')
for line in orig:
if pat_tuple.match(line):
tupl = pat_tuple.sub('', line)
tmp = re.split(r'\s+', tupl.strip())
if len(tmp) < 6 or len(tmp) > 9:
wmsg = _("Skipping malformed tuple (bad length): %s") \
% (tupl)
warn(wmsg)
continue
else:
# set direction to "in" to support upgrades
# from old format, which only had 6 or 8 fields.
dtype = "in"
interface_in = ""
interface_out = ""
if len(tmp) == 7 or len(tmp) == 9:
wmsg = _("Skipping malformed tuple (iface): %s") \
% (tupl)
dtype = tmp[-1].split('_')[0]
if '_' in tmp[-1]:
if '!' in tmp[-1] and \
pat_iface_in.search(tmp[-1]) and \
pat_iface_out.search(tmp[-1]):
# in_eth0!out_eth1
interface_in = \
tmp[-1].split('!')[0].partition('_')[2]
interface_out = \
tmp[-1].split('!')[1].partition('_')[2]
elif tmp[-1].startswith("in_"):
# in_eth0
interface_in = tmp[-1].partition('_')[2]
elif tmp[-1].startswith("out_"):
# out_eth0
interface_out = tmp[-1].partition('_')[2]
else:
warn(wmsg)
continue
try:
action = tmp[0]
forward = False
# route rules use 'route:<action> ...'
if ':' in action:
forward = True
action = action.split(':')[1]
if len(tmp) < 8:
rule = UFWRule(action, tmp[1], tmp[2], tmp[3],
tmp[4], tmp[5], dtype, forward)
else:
rule = UFWRule(action, tmp[1], tmp[2], tmp[3],
tmp[4], tmp[5], dtype, forward)
# Removed leading [sd]app_ and unescape spaces
pat_space = re.compile('%20')
if tmp[6] != "-":
rule.dapp = pat_space.sub(' ', tmp[6])
if tmp[7] != "-":
rule.sapp = pat_space.sub(' ', tmp[7])
if interface_in != "":
rule.set_interface("in", interface_in)
if interface_out != "":
rule.set_interface("out", interface_out)
except UFWError:
warn_msg = _("Skipping malformed tuple: %s") % \
(tupl)
warn(warn_msg)
continue
if f == self.files['rules6']:
rule.set_v6(True)
self.rules6.append(rule)
else:
rule.set_v6(False)
self.rules.append(rule)
orig.close()
def _write_rules(self, v6=False):
'''Write out new rules to file to user chain file'''
rules_file = self.files['rules']
if v6:
rules_file = self.files['rules6']
# Perform this here so we can present a nice error to the user rather
# than a traceback
if not os.access(rules_file, os.W_OK):
err_msg = _("'%s' is not writable" % (rules_file))
raise UFWError(err_msg)
try:
fns = ufw.util.open_files(rules_file)
except Exception:
raise
# Initialize the capabilities database
self.initcaps()
chain_prefix = "ufw"
rules = self.rules
if v6:
chain_prefix = "ufw6"
rules = self.rules6
if self.dryrun:
fd = sys.stdout.fileno()
else:
fd = fns['tmp']
# Write header
ufw.util.write_to_file(fd, "*filter\n")
ufw.util.write_to_file(fd, ":" + chain_prefix + "-user-input - [0:0]\n")
ufw.util.write_to_file(fd, ":" + chain_prefix + \
"-user-output - [0:0]\n")
ufw.util.write_to_file(fd, ":" + chain_prefix + \
"-user-forward - [0:0]\n")
ufw.util.write_to_file(fd, ":" + chain_prefix + \
"-before-logging-input - [0:0]\n")
ufw.util.write_to_file(fd, ":" + chain_prefix + \
"-before-logging-output - [0:0]\n")
ufw.util.write_to_file(fd, ":" + chain_prefix + \
"-before-logging-forward - [0:0]\n")
ufw.util.write_to_file(fd, ":" + chain_prefix + \
"-user-logging-input - [0:0]\n")
ufw.util.write_to_file(fd, ":" + chain_prefix + \
"-user-logging-output - [0:0]\n")
ufw.util.write_to_file(fd, ":" + chain_prefix + \
"-user-logging-forward - [0:0]\n")
ufw.util.write_to_file(fd, ":" + chain_prefix + \
"-after-logging-input - [0:0]\n")
ufw.util.write_to_file(fd, ":" + chain_prefix + \
"-after-logging-output - [0:0]\n")
ufw.util.write_to_file(fd, ":" + chain_prefix + \
"-after-logging-forward - [0:0]\n")
ufw.util.write_to_file(fd, ":" + chain_prefix + \
"-logging-deny - [0:0]\n")
ufw.util.write_to_file(fd, ":" + chain_prefix + \
"-logging-allow - [0:0]\n")
# Rate limiting is runtime supported
if (chain_prefix == "ufw" and self.caps['limit']['4']) or \
(chain_prefix == "ufw6" and self.caps['limit']['6']):
ufw.util.write_to_file(fd, ":" + chain_prefix + \
"-user-limit - [0:0]\n")
ufw.util.write_to_file(fd, ":" + chain_prefix + \
"-user-limit-accept - [0:0]\n")
ufw.util.write_to_file(fd, "### RULES ###\n")
# Write rules
for r in rules:
action = r.action
# route rules use 'route:<action> ...'
if r.forward:
action = "route:" + r.action
if r.logtype != "":
action += "_" + r.logtype
ifaces = ""
if r.interface_in == "" and r.interface_out == "":
ifaces = r.direction
elif r.interface_in != "" and r.interface_out != "":
ifaces = "in_%s!out_%s" % (r.interface_in, r.interface_out)
else:
if r.interface_in != "":
ifaces += "%s_%s" % (r.direction, r.interface_in)
else:
ifaces += "%s_%s" % (r.direction, r.interface_out)
if r.dapp == "" and r.sapp == "":
tstr = "\n### tuple ### %s %s %s %s %s %s %s" % \
(action, r.protocol, r.dport, r.dst, r.sport, r.src,
ifaces)
ufw.util.write_to_file(fd, tstr + "\n")
else:
pat_space = re.compile(' ')
dapp = "-"
if r.dapp:
dapp = pat_space.sub('%20', r.dapp)
sapp = "-"
if r.sapp:
sapp = pat_space.sub('%20', r.sapp)
tstr = "\n### tuple ### %s %s %s %s %s %s %s %s %s" % \
(action, r.protocol, r.dport, r.dst, r.sport, r.src, \
dapp, sapp, ifaces)
ufw.util.write_to_file(fd, tstr + "\n")
chain_suffix = "input"
if r.forward:
chain_suffix = "forward"
elif r.direction == "out":
chain_suffix = "output"
chain = "%s-user-%s" % (chain_prefix, chain_suffix)
rule_str = "-A %s %s\n" % (chain, r.format_rule())
for s in self._get_rules_from_formatted(rule_str, chain_prefix, \
chain_suffix):
ufw.util.write_to_file(fd, s)
# Write footer
ufw.util.write_to_file(fd, "\n### END RULES ###\n")
# Add logging rules, skipping any delete ('-D') rules
ufw.util.write_to_file(fd, "\n### LOGGING ###\n")
try:
lrules_t = self._get_logging_rules(self.defaults['loglevel'])
except Exception:
raise
for c, r, q in lrules_t:
if len(r) > 0 and r[0] == '-D':
continue
if c.startswith(chain_prefix + "-"):
ufw.util.write_to_file(fd,
" ".join(r).replace('[', '"[').replace('] ', '] "') + \
"\n")
ufw.util.write_to_file(fd, "### END LOGGING ###\n")
# Rate limiting is runtime supported
if (chain_prefix == "ufw" and self.caps['limit']['4']) or \
(chain_prefix == "ufw6" and self.caps['limit']['6']):
ufw.util.write_to_file(fd, "\n### RATE LIMITING ###\n")
if self.defaults['loglevel'] != "off":
ufw.util.write_to_file(fd, "-A " + \
chain_prefix + "-user-limit " + \
" ".join(self.ufw_user_limit_log) + \
" \"" + self.ufw_user_limit_log_text + " \"\n")
ufw.util.write_to_file(fd, "-A " + chain_prefix + \
"-user-limit -j REJECT\n")
ufw.util.write_to_file(fd, "-A " + chain_prefix + \
"-user-limit-accept -j ACCEPT\n")
ufw.util.write_to_file(fd, "### END RATE LIMITING ###\n")
ufw.util.write_to_file(fd, "COMMIT\n")
try:
if self.dryrun:
ufw.util.close_files(fns, False)
else:
ufw.util.close_files(fns)
except Exception:
raise
def set_rule(self, rule, allow_reload=True):
'''Updates firewall with rule by:
* appending the rule to the chain if new rule and firewall enabled
* deleting the rule from the chain if found and firewall enabled
* inserting the rule if possible and firewall enabled
* updating user rules file
* reloading the user rules file if rule is modified
'''
# Initialize the capabilities database
self.initcaps()
rstr = ""
if rule.v6:
if not self.use_ipv6():
err_msg = _("Adding IPv6 rule failed: IPv6 not enabled")
raise UFWError(err_msg)
if rule.action == 'limit' and not self.caps['limit']['6']:
# Rate limiting is runtime supported
return _("Skipping unsupported IPv6 '%s' rule") % (rule.action)
else:
if rule.action == 'limit' and not self.caps['limit']['4']:
# Rate limiting is runtime supported
return _("Skipping unsupported IPv4 '%s' rule") % (rule.action)
if rule.multi and rule.protocol != "udp" and rule.protocol != "tcp":
err_msg = _("Must specify 'tcp' or 'udp' with multiple ports")
raise UFWError(err_msg)
newrules = []
found = False
modified = False
rules = self.rules
position = rule.position
if rule.v6:
if self.iptables_version < "1.4" and (rule.dapp != "" or \
rule.sapp != ""):
return _("Skipping IPv6 application rule. Need at least iptables 1.4")
rules = self.rules6
# bail if we have a bad position
if position < 0 or position > len(rules):
err_msg = _("Invalid position '%d'") % (position)
raise UFWError(err_msg)
if position > 0 and rule.remove:
err_msg = _("Cannot specify insert and delete")
raise UFWError(err_msg)
if position > len(rules):
err_msg = _("Cannot insert rule at position '%d'") % position
raise UFWError(err_msg)
# First construct the new rules list
try:
rule.normalize()
except Exception:
raise
count = 1
inserted = False
matches = 0
last = ('', '', '', '')
for r in rules:
try:
r.normalize()
except Exception:
raise
current = (r.dst, r.src, r.dapp, r.sapp)
if count == position:
# insert the rule if:
# 1. the last rule was not an application rule
# 2. the current rule is not an application rule
# 3. the last application rule is different than the current
# while the new rule is different than the current one
if (last[2] == '' and last[3] == '' and count > 1) or \
(current[2] == '' and current[3] == '') or \
last != current:
inserted = True
newrules.append(rule.dup_rule())
last = ('', '', '', '')
else:
position += 1
last = current
count += 1
ret = UFWRule.match(r, rule)
if ret < 1:
matches += 1
if ret == 0 and not found and not inserted:
# If find the rule, add it if it's not to be removed, otherwise
# skip it.
found = True
if not rule.remove:
newrules.append(rule.dup_rule())
elif ret < 0 and not rule.remove and not inserted:
# If only the action is different, replace the rule if it's not
# to be removed.
found = True
modified = True
newrules.append(rule.dup_rule())
else:
newrules.append(r)
if inserted:
if matches > 0:
rstr = _("Skipping inserting existing rule")
if rule.v6:
rstr += " (v6)"
return rstr
else:
# Add rule to the end if it was not already added.
if not found and not rule.remove:
newrules.append(rule.dup_rule())
# Don't process non-existing or unchanged pre-exisiting rules
if not found and rule.remove and not self.dryrun:
rstr = _("Could not delete non-existent rule")
if rule.v6:
rstr += " (v6)"
return rstr
elif found and not rule.remove and not modified:
rstr = _("Skipping adding existing rule")
if rule.v6:
rstr += " (v6)"
return rstr
if rule.v6:
self.rules6 = newrules
else:
self.rules = newrules
# Update the user rules file
try:
self._write_rules(rule.v6)
except UFWError:
raise
except Exception:
err_msg = _("Couldn't update rules file")
UFWError(err_msg)
# We wrote out the rules, so set reasonable string. We will change
# this below when operating on the live firewall.
rstr = _("Rules updated")
if rule.v6:
rstr = _("Rules updated (v6)")
# Operate on the chains
if self.is_enabled() and not self.dryrun:
flag = ""
if modified or self._need_reload(rule.v6) or inserted:
rstr = ""
if inserted:
rstr += _("Rule inserted")
else:
rstr += _("Rule updated")
if rule.v6:
rstr += " (v6)"
if allow_reload:
# Reload the chain
try:
self._reload_user_rules()
except Exception:
raise
else:
rstr += _(" (skipped reloading firewall)")
elif found and rule.remove:
flag = '-D'
rstr = _("Rule deleted")
elif not found and not modified and not rule.remove:
flag = '-A'
rstr = _("Rule added")
if flag != "":
exe = self.iptables
chain_prefix = "ufw"
if rule.v6:
exe = self.ip6tables
chain_prefix = "ufw6"
rstr += " (v6)"
chain_suffix = "input"
if rule.forward:
chain_suffix = "forward"
elif rule.direction == "out":
chain_suffix = "output"
chain = "%s-user-%s" % (chain_prefix, chain_suffix)
# Is the firewall running?
err_msg = _("Could not update running firewall")
(rc, out) = cmd([exe, '-L', chain, '-n'])
if rc != 0:
raise UFWError(err_msg)
rule_str = "%s %s %s" % (flag, chain, rule.format_rule())
pat_log = re.compile(r'(-A +)(ufw6?-user-[a-z\-]+)(.*)')
for s in self._get_lists_from_formatted(rule_str, \
chain_prefix, \
chain_suffix):
(rc, out) = cmd([exe] + s)
if rc != 0:
msg(out, sys.stderr)
UFWError(err_msg)
# delete any lingering RETURN rules (needed for upgrades)
if flag == "-A" and pat_log.search(" ".join(s)):
c = pat_log.sub(r'\2', " ".join(s))
(rc, out) = cmd([exe, '-D', c, '-j', 'RETURN'])
if rc != 0:
debug("FAILOK: -D %s -j RETURN" % (c))
return rstr
def get_app_rules_from_system(self, template, v6):
'''Return a list of UFWRules from the system based on template rule'''
rules = []
app_rules = []
if v6:
rules = self.rules6
else:
rules = self.rules
norm = template.dup_rule()
norm.set_v6(v6)
norm.normalize()
tupl = norm.get_app_tuple()
for r in rules:
tmp = r.dup_rule()
tmp.normalize()
tmp_tuple = tmp.get_app_tuple()
if tmp_tuple == tupl:
app_rules.append(tmp)
return app_rules
def _chain_cmd(self, chain, args, fail_ok=False):
'''Perform command on chain'''
exe = self.iptables
if chain.startswith("ufw6"):
exe = self.ip6tables
(rc, out) = cmd([exe] + args)
if rc != 0:
err_msg = _("Could not perform '%s'" % (args))
if fail_ok:
debug("FAILOK: " + err_msg)
else:
raise UFWError(err_msg)
def update_logging(self, level):
'''Update loglevel of running firewall'''
if self.dryrun:
return
# Initialize the capabilities database
self.initcaps()
rules_t = []
try:
rules_t = self._get_logging_rules(level)
except Exception:
raise
# Update the user rules file
try:
self._write_rules(v6=False)
self._write_rules(v6=True)
except UFWError:
raise
except Exception:
err_msg = _("Couldn't update rules file for logging")
UFWError(err_msg)
# Don't update the running firewall if not enabled
if not self.is_enabled():
return
# make sure all the chains are here, it's redundant but helps make
# sure the chains are in a consistent state
err_msg = _("Could not update running firewall")
for c in self.chains['before'] + self.chains['user'] + \
self.chains['after'] + self.chains['misc']:
try:
self._chain_cmd(c, ['-L', c, '-n'])
except Exception:
raise UFWError(err_msg)
# Flush all the logging chains except 'user'
try:
for c in self.chains['before'] + self.chains['after'] + \
self.chains['misc']:
self._chain_cmd(c, ['-F', c])
self._chain_cmd(c, ['-Z', c])
except Exception:
raise UFWError(err_msg)
# Add logging rules to running firewall
for c, r, q in rules_t:
fail_ok = False
if len(r) > 0 and r[0] == '-D':
fail_ok = True
try:
if q == 'delete_first' and len(r) > 1:
self._chain_cmd(c, ['-D'] + r[1:], fail_ok=True)
self._chain_cmd(c, r, fail_ok)
except Exception:
raise UFWError(err_msg)
# Rate limiting is runtime supported
# Always delete these and re-add them so that we don't have extras
for chain in ['ufw-user-limit', 'ufw6-user-limit']:
if (self.caps['limit']['4'] and chain == 'ufw-user-limit') or \
(self.caps['limit']['6'] and chain == 'ufw6-user-limit'):
self._chain_cmd(chain, ['-D', chain] + \
self.ufw_user_limit_log + \
[self.ufw_user_limit_log_text + " "], \
fail_ok=True)
if self.defaults["loglevel"] != "off":
self._chain_cmd(chain, ['-I', chain] + \
self.ufw_user_limit_log + \
[self.ufw_user_limit_log_text + " "], \
fail_ok=True)
def _get_logging_rules(self, level):
'''Get rules for specified logging level'''
rules_t = []
if level not in list(self.loglevels.keys()):
err_msg = _("Invalid log level '%s'") % (level)
raise UFWError(err_msg)
if level == "off":
# when off, insert a RETURN rule at the top of user rules, thus
# preserving the rules
for c in self.chains['user']:
rules_t.append([c, ['-I', c, '-j', 'RETURN'], 'delete_first'])
return rules_t
else:
# when on, remove the RETURN rule at the top of user rules, thus
# honoring the log rules
for c in self.chains['user']:
rules_t.append([c, ['-D', c, '-j', 'RETURN'], ''])
limit_args = ['-m', 'limit', '--limit', '3/min', '--limit-burst', '10']
# log levels of low and higher log blocked packets
if self.loglevels[level] >= self.loglevels["low"]:
# Setup the policy violation logging chains
largs = []
# log levels under high use limit
if self.loglevels[level] < self.loglevels["high"]:
largs = limit_args
for c in self.chains['after']:
for t in ['input', 'output', 'forward']:
if c.endswith(t):
if self._get_default_policy(t) == "reject" or \
self._get_default_policy(t) == "deny":
prefix = "[UFW BLOCK] "
rules_t.append([c, ['-A', c, '-j', 'LOG', \
'--log-prefix', prefix] +
largs, ''])
elif self.loglevels[level] >= self.loglevels["medium"]:
prefix = "[UFW ALLOW] "
rules_t.append([c, ['-A', c, '-j', 'LOG', \
'--log-prefix', prefix] + \
largs, ''])
# Setup the miscellaneous logging chains
largs = []
# log levels under high use limit
if self.loglevels[level] < self.loglevels["high"]:
largs = limit_args
for c in self.chains['misc']:
if c.endswith("allow"):
prefix = "[UFW ALLOW] "
elif c.endswith("deny"):
prefix = "[UFW BLOCK] "
if self.loglevels[level] < self.loglevels["medium"]:
# only log INVALID in medium and higher
rules_t.append([c, ['-I', c, '-m', 'conntrack', \
'--ctstate', 'INVALID', \
'-j', 'RETURN'] + largs, ''])
else:
rules_t.append([c, ['-A', c, '-m', 'conntrack', \
'--ctstate', 'INVALID', \
'-j', 'LOG', \
'--log-prefix', \
"[UFW AUDIT INVALID] "] + \
largs, ''])
rules_t.append([c, ['-A', c, '-j', 'LOG', \
'--log-prefix', prefix] + largs, ''])
# Setup the audit logging chains
if self.loglevels[level] >= self.loglevels["medium"]:
# loglevel full logs all packets without limit
largs = []
# loglevel high logs all packets with limit
if self.loglevels[level] < self.loglevels["full"]:
largs = limit_args
# loglevel medium logs all new packets with limit
if self.loglevels[level] < self.loglevels["high"]:
largs = ['-m', 'conntrack', '--ctstate', 'NEW'] + limit_args
prefix = "[UFW AUDIT] "
for c in self.chains['before']:
rules_t.append([c, ['-I', c, '-j', 'LOG', \
'--log-prefix', prefix] + largs, ''])
return rules_t
def reset(self):
'''Reset the firewall'''
res = ""
# First make sure we have all the original files
allfiles = []
for i in self.files:
if not self.files[i].endswith('.rules'):
continue
allfiles.append(self.files[i])
fn = os.path.join(ufw.common.share_dir, "iptables", \
os.path.basename(self.files[i]))
if not os.path.isfile(fn):
err_msg = _("Could not find '%s'. Aborting") % (fn)
raise UFWError(err_msg)
ext = time.strftime("%Y%m%d_%H%M%S")
# This implementation will intentionally traceback if someone tries to
# do something to take advantage of the race conditions here.
# Don't do anything if the files already exist
for i in allfiles:
fn = "%s.%s" % (i, ext)
if os.path.exists(fn):
err_msg = _("'%s' already exists. Aborting") % (fn)
raise UFWError(err_msg)
# Move the old to the new
for i in allfiles:
fn = "%s.%s" % (i, ext)
res += _("Backing up '%(old)s' to '%(new)s'\n") % (\
{'old': os.path.basename(i), 'new': fn})
os.rename(i, fn)
# Copy files into place
for i in allfiles:
old = "%s.%s" % (i, ext)
shutil.copy(os.path.join(ufw.common.share_dir, "iptables", \
os.path.basename(i)), \
os.path.dirname(i))
shutil.copymode(old, i)
try:
statinfo = os.stat(i)
mode = statinfo[stat.ST_MODE]
except Exception:
warn_msg = _("Couldn't stat '%s'") % (i)
warn(warn_msg)
continue
if mode & stat.S_IWOTH:
res += _("WARN: '%s' is world writable") % (i)
elif mode & stat.S_IROTH:
res += _("WARN: '%s' is world readable") % (i)
return res
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