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Filename: //lib/python3/dist-packages/ufw/backend.py
'''backend.py: interface for ufw backends''' # # Copyright 2008-2018 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 errno import os import pwd import re import stat import sys import ufw.util from ufw.util import error, warn, debug, _findpath from ufw.common import UFWError, UFWRule import ufw.applications class UFWBackend: '''Interface for backends''' def __init__(self, name, dryrun, extra_files=None, rootdir=None, datadir=None): self.defaults = None self.name = name self.dryrun = dryrun self.rules = [] self.rules6 = [] p = _findpath(ufw.common.config_dir, datadir) self.files = {'defaults': os.path.join(p, 'default/ufw'), 'conf': os.path.join(p, 'ufw/ufw.conf'), 'apps': os.path.join(p, 'ufw/applications.d') } if extra_files is not None: self.files.update(extra_files) self.loglevels = {'off': 0, 'low': 100, 'medium': 200, 'high': 300, 'full': 400 } self.do_checks = ufw.common.do_checks self._do_checks() self._get_defaults() self._read_rules() self.profiles = ufw.applications.get_profiles(self.files['apps']) self.iptables = os.path.join(ufw.common.iptables_dir, "iptables") self.iptables_restore = os.path.join(ufw.common.iptables_dir, \ "iptables-restore") self.ip6tables = os.path.join(ufw.common.iptables_dir, "ip6tables") self.ip6tables_restore = os.path.join(ufw.common.iptables_dir, \ "ip6tables-restore") try: self.iptables_version = ufw.util.get_iptables_version(self.iptables) except OSError: # pragma: no coverage err_msg = _("Couldn't determine iptables version") raise UFWError(err_msg) # Initialize via initcaps only when we need it (LP: #1044361) self.caps = None def initcaps(self): '''Initialize the capabilities database. This needs to be called before accessing the database.''' # Only initialize if not initialized already if self.caps is not None: return self.caps = {} self.caps['limit'] = {} # Set defaults for dryrun, non-root, etc self.caps['limit']['4'] = True self.caps['limit']['6'] = False # historical default for the testsuite # Try to get capabilities from the running system if root if self.do_checks and os.getuid() == 0 and not self.dryrun: # pragma: no coverage # v4 try: nf_caps = ufw.util.get_netfilter_capabilities(self.iptables) except OSError as e: msg = "initcaps\n%s" % e if self.is_enabled(): error(msg) warn(msg) return if 'recent-set' in nf_caps and 'recent-update' in nf_caps: self.caps['limit']['4'] = True else: self.caps['limit']['4'] = False # v6 (skip capabilities check for ipv6 if ipv6 is disabled in ufw # because the system may not have ipv6 support (LP: #1039729) if self.use_ipv6(): try: nf_caps = ufw.util.get_netfilter_capabilities(self.ip6tables) except OSError as e: error("initcaps\n%s" % e) if 'recent-set' in nf_caps and 'recent-update' in nf_caps: self.caps['limit']['6'] = True else: self.caps['limit']['6'] = False def is_enabled(self): '''Is firewall configured as enabled''' if 'enabled' in self.defaults and \ self.defaults['enabled'] == 'yes': return True return False def use_ipv6(self): '''Is firewall configured to use IPv6''' if 'ipv6' in self.defaults and \ self.defaults['ipv6'] == 'yes' and \ os.path.exists("/proc/sys/net/ipv6"): return True return False def _get_default_policy(self, primary="input", check_forward=False): '''Get default policy for specified primary chain''' policy = "default_" + primary + "_policy" rstr = "" if self.defaults[policy] == "accept": rstr = "allow" elif self.defaults[policy] == "reject": rstr = "reject" else: rstr = "deny" if check_forward and primary == "forward": enabled = False err_msg = _("problem running sysctl") (rc, out) = ufw.util.cmd(['sysctl', 'net.ipv4.ip_forward']) if rc != 0: # pragma: no cover raise UFWError(err_msg) if '1' in out: enabled = True # IPv6 may be disabled, so ignore sysctl output if self.use_ipv6(): (rc, out) = ufw.util.cmd(['sysctl', 'net.ipv6.conf.default.forwarding']) if rc == 0 and '1' in out: enabled = True (rc, out) = ufw.util.cmd(['sysctl', 'net.ipv6.conf.all.forwarding']) if rc == 0 and '1' in out: enabled = True if not enabled: rstr = "disabled" return rstr # Don't do coverage on this cause we don't run the unit tests as root def _do_checks(self): # pragma: no coverage '''Perform basic security checks: is setuid or setgid (for non-Linux systems) checks that script is owned by root checks that every component in absolute path are owned by root warn if script is group writable warn if part of script path is group writable Doing this at the beginning causes a race condition with later operations that don't do these checks. However, if the user running this script is root, then need to be root to exploit the race condition (and you are hosed anyway...) ''' if not self.do_checks: err_msg = _("Checks disabled") warn(err_msg) return True # Not needed on Linux, but who knows the places we will go... if os.getuid() != os.geteuid(): err_msg = _("ERROR: this script should not be SUID") raise UFWError(err_msg) if os.getgid() != os.getegid(): err_msg = _("ERROR: this script should not be SGID") raise UFWError(err_msg) uid = os.getuid() if uid != 0: err_msg = _("You need to be root to run this script") raise UFWError(err_msg) # Use these so we only warn once warned_world_write = {} warned_group_write = {} warned_owner = {} profiles = [] if not os.path.isdir(self.files['apps']): warn_msg = _("'%s' does not exist") % (self.files['apps']) warn(warn_msg) else: pat = re.compile(r'^\.') for profile in os.listdir(self.files['apps']): if not pat.search(profile): profiles.append(os.path.join(self.files['apps'], profile)) for path in list(self.files.values()) + \ [ os.path.abspath(sys.argv[0]) ] + \ profiles: if not path.startswith('/'): path = "%s/%s" % (os.getcwd(), path) while True: debug("Checking " + path) if path == self.files['apps'] and \ not os.path.isdir(self.files['apps']): break try: statinfo = os.stat(path) mode = statinfo[stat.ST_MODE] except OSError: err_msg = _("Couldn't stat '%s'") % (path) raise UFWError(err_msg) except Exception: raise # snaps and clicks unpack to this, so handle it click_user = 'clickpkg' snap_user = 'snappypkg' is_unpack_user = False try: if pwd.getpwuid(statinfo.st_uid)[0] == click_user or \ pwd.getpwuid(statinfo.st_uid)[0] == snap_user: is_unpack_user = True except KeyError: pass if statinfo.st_uid != 0 and not is_unpack_user and \ path not in warned_owner: warn_msg = _("uid is %(uid)s but '%(path)s' is owned by " \ "%(st_uid)s") % ({'uid': str(uid), \ 'path': path, \ 'st_uid': str(statinfo.st_uid)}) warn(warn_msg) warned_owner[path] = True if mode & stat.S_IWOTH and path not in warned_world_write: warn_msg = _("%s is world writable!") % (path) warn(warn_msg) warned_world_write[path] = True if mode & stat.S_IWGRP and path not in warned_group_write and \ statinfo.st_gid != 0: warn_msg = _("%s is group writable!") % (path) warn(warn_msg) warned_group_write[path] = True if path == "/": break last_path = path path = os.path.dirname(path) if not path: raise OSError(errno.ENOENT, \ "Could not find parent for '%s'" % \ (last_path)) for f in self.files: if f != 'apps' and not os.path.isfile(self.files[f]): err_msg = _("'%(f)s' file '%(name)s' does not exist") % \ ({'f': f, 'name': self.files[f]}) raise UFWError(err_msg) def _get_defaults(self): '''Get all settings from defaults file''' self.defaults = {} for f in [self.files['defaults'], self.files['conf']]: try: orig = ufw.util.open_file_read(f) except Exception: # pragma: no coverage err_msg = _("Couldn't open '%s' for reading") % (f) raise UFWError(err_msg) pat = re.compile(r'^\w+="?\w+"?') for line in orig: if pat.search(line): tmp = re.split(r'=', line.strip()) self.defaults[tmp[0].lower()] = tmp[1].lower().strip('"\'') orig.close() # do some default policy sanity checking policies = ['accept', 'drop', 'reject'] for c in [ 'input', 'output', 'forward' ]: if 'default_%s_policy' % (c) not in self.defaults: err_msg = _("Missing policy for '%s'" % (c)) raise UFWError(err_msg) p = self.defaults['default_%s_policy' % (c)] if p not in policies: err_msg = _("Invalid policy '%(policy)s' for '%(chain)s'" % \ ({'policy': p, 'chain': c})) raise UFWError(err_msg) def set_default(self, fn, opt, value): '''Sets option in defaults file''' if not re.match(r'^[\w_]+$', opt): err_msg = _("Invalid option") raise UFWError(err_msg) # Perform this here so we can present a nice error to the user rather # than a traceback if not os.access(fn, os.W_OK): err_msg = _("'%s' is not writable" % (fn)) raise UFWError(err_msg) fns = ufw.util.open_files(fn) fd = fns['tmp'] found = False pat = re.compile(r'^' + opt + '=') for line in fns['orig']: if pat.search(line): ufw.util.write_to_file(fd, opt + "=" + value + "\n") found = True else: ufw.util.write_to_file(fd, line) # Add the entry if not found if not found: ufw.util.write_to_file(fd, opt + "=" + value + "\n") try: ufw.util.close_files(fns) except Exception: # pragma: no coverage raise # Now that the files are written out, update value in memory self.defaults[opt.lower()] = value.lower().strip('"\'') def set_default_application_policy(self, policy): '''Sets default application policy of firewall''' if not self.dryrun: if policy == "allow": self.set_default(self.files['defaults'], \ "DEFAULT_APPLICATION_POLICY", \ "\"ACCEPT\"") elif policy == "deny": self.set_default(self.files['defaults'], \ "DEFAULT_APPLICATION_POLICY", \ "\"DROP\"") elif policy == "reject": self.set_default(self.files['defaults'], \ "DEFAULT_APPLICATION_POLICY", \ "\"REJECT\"") elif policy == "skip": self.set_default(self.files['defaults'], \ "DEFAULT_APPLICATION_POLICY", \ "\"SKIP\"") else: err_msg = _("Unsupported policy '%s'") % (policy) raise UFWError(err_msg) rstr = _("Default application policy changed to '%s'") % (policy) return rstr def get_app_rules_from_template(self, template): '''Return a list of UFWRules based on the template rule''' rules = [] profile_names = list(self.profiles.keys()) if template.dport in profile_names and template.sport in profile_names: dports = ufw.applications.get_ports(self.profiles[template.dport]) sports = ufw.applications.get_ports(self.profiles[template.sport]) for i in dports: tmp = template.dup_rule() tmp.dapp = "" tmp.set_port("any", "src") (port, proto) = ufw.util.parse_port_proto(i) tmp.set_protocol(proto) tmp.set_port(port, "dst") tmp.dapp = template.dapp if template.dport == template.sport: # Just use the same ports as dst for src when they are the # same to avoid duplicate rules tmp.sapp = "" (port, proto) = ufw.util.parse_port_proto(i) tmp.set_protocol(proto) tmp.set_port(port, "src") tmp.sapp = template.sapp rules.append(tmp) else: for j in sports: rule = tmp.dup_rule() rule.sapp = "" (port, proto) = ufw.util.parse_port_proto(j) rule.set_protocol(proto) rule.set_port(port, "src") if rule.protocol == "any": rule.set_protocol(tmp.protocol) rule.sapp = template.sapp rules.append(rule) elif template.sport in profile_names: for p in ufw.applications.get_ports(self.profiles[template.sport]): rule = template.dup_rule() rule.sapp = "" (port, proto) = ufw.util.parse_port_proto(p) rule.set_protocol(proto) rule.set_port(port, "src") rule.sapp = template.sapp rules.append(rule) elif template.dport in profile_names: for p in ufw.applications.get_ports(self.profiles[template.dport]): rule = template.dup_rule() rule.dapp = "" (port, proto) = ufw.util.parse_port_proto(p) rule.set_protocol(proto) rule.set_port(port, "dst") rule.dapp = template.dapp rules.append(rule) if len(rules) < 1: err_msg = _("No rules found for application profile") raise UFWError(err_msg) return rules def update_app_rule(self, profile): '''Update rule for profile in place. Returns result string and bool on whether or not the profile is used in the current ruleset. ''' updated_rules = [] updated_rules6 = [] last_tuple = "" rstr = "" updated_profile = False # Remember, self.rules is from user[6].rules, and not the running # firewall. for r in self.rules + self.rules6: if r.dapp == profile or r.sapp == profile: # We assume that the rules are in app rule order. Specifically, # if app rule has multiple rules, they are one after the other. # If the rule ordering changes, the below will have to change. tupl = r.get_app_tuple() if tupl == last_tuple: # Skip the rule if seen this tuple already (ie, it is part # of a known tuple). continue else: # Have a new tuple, so find and insert new app rules here template = r.dup_rule() template.set_protocol("any") if template.dapp != "": template.set_port(template.dapp, "dst") if template.sapp != "": template.set_port(template.sapp, "src") new_app_rules = self.get_app_rules_from_template(\ template) for new_r in new_app_rules: new_r.normalize() if new_r.v6: updated_rules6.append(new_r) else: updated_rules.append(new_r) last_tuple = tupl updated_profile = True else: if r.v6: updated_rules6.append(r) else: updated_rules.append(r) if updated_profile: self.rules = updated_rules self.rules6 = updated_rules6 rstr += _("Rules updated for profile '%s'") % (profile) try: self._write_rules(False) # ipv4 self._write_rules(True) # ipv6 except Exception: # pragma: no coverage err_msg = _("Couldn't update application rules") raise UFWError(err_msg) return (rstr, updated_profile) def find_application_name(self, profile_name): '''Find the application profile name for profile_name''' if profile_name in self.profiles: return profile_name match = "" matches = 0 for n in list(self.profiles.keys()): if n.lower() == profile_name.lower(): match = n matches += 1 debug_msg = "'%d' matches for '%s'" % (matches, profile_name) debug(debug_msg) if matches == 1: return match elif matches > 1: err_msg = _("Found multiple matches for '%s'. Please use exact profile name") % \ (profile_name) else: err_msg = _("Could not find a profile matching '%s'") % \ (profile_name) raise UFWError(err_msg) def find_other_position(self, position, v6): '''Return the absolute position in the other list of the rule with the user position of the given list. For example, find_other_position(4, True) will return the absolute position of the rule in the ipv4 list matching the user specified '4' rule in the ipv6 list. ''' # Invalid search (v6 rule with too low position) if v6 and position > len(self.rules6): raise ValueError() # Invalid search (v4 rule with too high position) if not v6 and position > len(self.rules): raise ValueError() if position < 1: raise ValueError() rules = [] if v6: rules = self.rules6 else: rules = self.rules # self.rules[6] is a list of tuples. Some application rules have # multiple tuples but the user specifies by ufw rule, not application # tuple, so we need to find how many tuples there are leading up to # the specified position, which we can then use as an offset for # getting the proper match_rule. app_rules = {} tuple_offset = 0 for i, r in enumerate(rules): if i >= position: break tupl = "" if r.dapp != "" or r.sapp != "": tupl = r.get_app_tuple() if tupl in app_rules: tuple_offset += 1 else: app_rules[tupl] = True rules = [] if v6: rules = self.rules match_rule = self.rules6[position - 1 + tuple_offset].dup_rule() match_rule.set_v6(False) else: rules = self.rules6 match_rule = self.rules[position - 1 + tuple_offset].dup_rule() match_rule.set_v6(True) count = 1 for r in rules: if UFWRule.match(r, match_rule) == 0: return count count += 1 return 0 def get_loglevel(self): '''Gets current log level of firewall''' level = 0 rstr = _("Logging: ") if 'loglevel' not in self.defaults or \ self.defaults['loglevel'] not in list(self.loglevels.keys()): level = -1 rstr += _("unknown") else: level = self.loglevels[self.defaults['loglevel']] if level == 0: rstr += "off" else: rstr += "on (%s)" % (self.defaults['loglevel']) return (level, rstr) def set_loglevel(self, level): '''Sets log level of firewall''' if level not in list(self.loglevels.keys()) + ['on']: err_msg = _("Invalid log level '%s'") % (level) raise UFWError(err_msg) new_level = level if level == "on": if 'loglevel' not in self.defaults or \ self.defaults['loglevel'] == "off": new_level = "low" else: new_level = self.defaults['loglevel'] self.set_default(self.files['conf'], "LOGLEVEL", new_level) self.update_logging(new_level) if new_level == "off": return _("Logging disabled") else: return _("Logging enabled") def get_rules(self): '''Return list of all rules''' return self.rules + self.rules6 def get_rules_count(self, v6): '''Return number of ufw rules (not iptables rules)''' rules = [] if v6: rules = self.rules6 else: rules = self.rules count = 0 app_rules = {} for r in rules: tupl = "" if r.dapp != "" or r.sapp != "": tupl = r.get_app_tuple() if tupl in app_rules: debug("Skipping found tuple '%s'" % (tupl)) continue else: app_rules[tupl] = True count += 1 return count def get_rule_by_number(self, num): '''Return rule specified by number seen via "status numbered"''' rules = self.get_rules() count = 1 app_rules = {} for r in rules: tupl = "" if r.dapp != "" or r.sapp != "": tupl = r.get_app_tuple() if tupl in app_rules: debug("Skipping found tuple '%s'" % (tupl)) continue else: app_rules[tupl] = True if count == int(num): return r count += 1 return None def get_matching(self, rule): '''See if there is a matching rule in the existing ruleset. Note this does not group rules by tuples.''' matched = [] count = 0 for r in self.get_rules(): count += 1 ret = rule.fuzzy_dst_match(r) if ret < 1: matched.append(count) return matched # API overrides def set_default_policy(self, policy, direction): # pragma: no coverage '''Set default policy for specified direction''' raise UFWError("UFWBackend.set_default_policy: need to override") def get_running_raw(self, rules_type): # pragma: no coverage '''Get status of running firewall''' raise UFWError("UFWBackend.get_running_raw: need to override") def get_status(self, verbose, show_count): # pragma: no coverage '''Get managed rules''' raise UFWError("UFWBackend.get_status: need to override") def set_rule(self, rule, allow_reload): # pragma: no coverage '''Update firewall with rule''' raise UFWError("UFWBackend.set_rule: need to override") def start_firewall(self): # pragma: no coverage '''Start the firewall''' raise UFWError("UFWBackend.start_firewall: need to override") def stop_firewall(self): # pragma: no coverage '''Stop the firewall''' raise UFWError("UFWBackend.stop_firewall: need to override") def get_app_rules_from_system(self, template, v6): # pragma: no coverage '''Get a list if rules based on template''' raise UFWError("UFWBackend.get_app_rules_from_system: need to " + \ "override") def update_logging(self, level): # pragma: no coverage '''Update loglevel of running firewall''' raise UFWError("UFWBackend.update_logging: need to override") def reset(self): # pragma: no coverage '''Reset the firewall''' raise UFWError("UFWBackend.reset: need to override")
./Ninja\.