# Authors: Simo Sorce # # Copyright (C) 2007-2011 Red Hat # see file 'COPYING' for use and warranty information # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # 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 . # from __future__ import print_function import string import tempfile import subprocess import random import os, sys, traceback import copy import stat import shutil import socket import struct import re import datetime import netaddr import time import gssapi import pwd import grp from contextlib import contextmanager import locale import collections from dns import resolver, rdatatype, reversename from dns.exception import DNSException import six from six.moves import input from six.moves import urllib from ipapython.ipa_log_manager import * from ipapython import ipavalidate from ipapython import config from ipaplatform.paths import paths from ipapython.dn import DN from ipapython.dnsutil import DNSName SHARE_DIR = paths.USR_SHARE_IPA_DIR PLUGINS_SHARE_DIR = paths.IPA_PLUGINS GEN_PWD_LEN = 12 IPA_BASEDN_INFO = 'ipa v2.0' # Having this in krb_utils would cause circular import KRB5_KDC_UNREACH = 2529639068 # Cannot contact any KDC for requested realm KRB5KDC_ERR_SVC_UNAVAILABLE = 2529638941 # A service is not available that is # required to process the request try: from subprocess import CalledProcessError except ImportError: # Python 2.4 doesn't implement CalledProcessError class CalledProcessError(Exception): """This exception is raised when a process run by check_call() returns a non-zero exit status. The exit status will be stored in the returncode attribute.""" def __init__(self, returncode, cmd, output=None): self.returncode = returncode self.cmd = cmd self.output = output def __str__(self): return "Command '%s' returned non-zero exit status %d" % (self.cmd, self.returncode) def get_domain_name(): try: config.init_config() domain_name = config.config.get_domain() except Exception: return None return domain_name class CheckedIPAddress(netaddr.IPAddress): # Use inet_pton() rather than inet_aton() for IP address parsing. We # will use the same function in IPv4/IPv6 conversions + be stricter # and don't allow IP addresses such as '1.1.1' in the same time netaddr_ip_flags = netaddr.INET_PTON def __init__(self, addr, match_local=False, parse_netmask=True, allow_network=False, allow_loopback=False, allow_broadcast=False, allow_multicast=False): if isinstance(addr, CheckedIPAddress): super(CheckedIPAddress, self).__init__(addr, flags=self.netaddr_ip_flags) self.prefixlen = addr.prefixlen self.defaultnet = addr.defaultnet self.interface = addr.interface return net = None iface = None defnet = False if isinstance(addr, netaddr.IPNetwork): net = addr addr = net.ip elif isinstance(addr, netaddr.IPAddress): pass else: try: try: addr = netaddr.IPAddress(str(addr), flags=self.netaddr_ip_flags) except netaddr.AddrFormatError: # netaddr.IPAddress doesn't handle zone indices in textual # IPv6 addresses. Try removing zone index and parse the # address again. if not isinstance(addr, six.string_types): raise addr, sep, foo = addr.partition('%') if sep != '%': raise addr = netaddr.IPAddress(str(addr), flags=self.netaddr_ip_flags) if addr.version != 6: raise except ValueError: net = netaddr.IPNetwork(str(addr), flags=self.netaddr_ip_flags) if not parse_netmask: raise ValueError("netmask and prefix length not allowed here") addr = net.ip if addr.version not in (4, 6): raise ValueError("unsupported IP version") if not allow_loopback and addr.is_loopback(): raise ValueError("cannot use loopback IP address") if (not addr.is_loopback() and addr.is_reserved()) \ or addr in netaddr.ip.IPV4_6TO4: raise ValueError("cannot use IANA reserved IP address") if addr.is_link_local(): raise ValueError("cannot use link-local IP address") if not allow_multicast and addr.is_multicast(): raise ValueError("cannot use multicast IP address") if match_local: if addr.version == 4: family = 'inet' elif addr.version == 6: family = 'inet6' result = run( [paths.IP, '-family', family, '-oneline', 'address', 'show'], capture_output=True) lines = result.output.split('\n') for line in lines: fields = line.split() if len(fields) < 4: continue ifnet = netaddr.IPNetwork(fields[3]) if ifnet == net or (net is None and ifnet.ip == addr): net = ifnet iface = fields[1] break if iface is None: raise ValueError('No network interface matches the provided IP address and netmask') if net is None: defnet = True if addr.version == 4: net = netaddr.IPNetwork(netaddr.cidr_abbrev_to_verbose(str(addr))) elif addr.version == 6: net = netaddr.IPNetwork(str(addr) + '/64') if not allow_network and addr == net.network: raise ValueError("cannot use IP network address") if not allow_broadcast and addr.version == 4 and addr == net.broadcast: raise ValueError("cannot use broadcast IP address") super(CheckedIPAddress, self).__init__(addr, flags=self.netaddr_ip_flags) self.prefixlen = net.prefixlen self.defaultnet = defnet self.interface = iface def is_local(self): return self.interface is not None def valid_ip(addr): return netaddr.valid_ipv4(addr) or netaddr.valid_ipv6(addr) def format_netloc(host, port=None): """ Format network location (host:port). If the host part is a literal IPv6 address, it must be enclosed in square brackets (RFC 2732). """ host = str(host) try: socket.inet_pton(socket.AF_INET6, host) host = '[%s]' % host except socket.error: pass if port is None: return host else: return '%s:%s' % (host, str(port)) def realm_to_suffix(realm_name): 'Convert a kerberos realm to a IPA suffix.' s = realm_name.split(".") suffix_dn = DN(*[('dc', x.lower()) for x in s]) return suffix_dn def suffix_to_realm(suffix_dn): 'Convert a IPA suffix to a kerberos realm.' assert isinstance(suffix_dn, DN) realm = '.'.join([x.value for x in suffix_dn]) return realm def template_str(txt, vars): val = string.Template(txt).substitute(vars) # eval() is a special string one can insert into a template to have the # Python interpreter evaluate the string. This is intended to allow # math to be performed in templates. pattern = re.compile('(eval\s*\(([^()]*)\))') val = pattern.sub(lambda x: str(eval(x.group(2))), val) return val def template_file(infilename, vars): """Read a file and perform template substitutions""" with open(infilename) as f: return template_str(f.read(), vars) def copy_template_file(infilename, outfilename, vars): """Copy a file, performing template substitutions""" txt = template_file(infilename, vars) with open(outfilename, 'w') as file: file.write(txt) def write_tmp_file(txt): fd = tempfile.NamedTemporaryFile() fd.write(txt) fd.flush() return fd def shell_quote(string): if isinstance(string, str): return "'" + string.replace("'", "'\\''") + "'" else: return b"'" + string.replace(b"'", b"'\\''") + b"'" if six.PY3: def _log_arg(s): """Convert string or bytes to a string suitable for logging""" if isinstance(s, bytes): return s.decode(locale.getpreferredencoding(), errors='replace') else: return s else: _log_arg = str class _RunResult(collections.namedtuple('_RunResult', 'output error_output returncode')): """Result of ipautil.run""" def run(args, stdin=None, raiseonerr=True, nolog=(), env=None, capture_output=False, skip_output=False, cwd=None, runas=None, timeout=None, suplementary_groups=[], capture_error=False, encoding=None, redirect_output=False): """ Execute an external command. :param args: List of arguments for the command :param stdin: Optional input to the command :param raiseonerr: If True, raises an exception if the return code is not zero :param nolog: Tuple of strings that shouldn't be logged, like passwords. Each tuple consists of a string to be replaced by XXXXXXXX. Example: We have a command [paths.SETPASSWD, '--password', 'Secret123', 'someuser'] and we don't want to log the password so nolog would be set to: ('Secret123',) The resulting log output would be: /usr/bin/setpasswd --password XXXXXXXX someuser If a value isn't found in the list it is silently ignored. :param env: Dictionary of environment variables passed to the command. When None, current environment is copied :param capture_output: Capture stdout :param skip_output: Redirect the output to /dev/null and do not log it :param cwd: Current working directory :param runas: Name of a user that the command should be run as. The spawned process will have both real and effective UID and GID set. :param timeout: Timeout if the command hasn't returned within the specified number of seconds. :param suplementary_groups: List of group names that will be used as suplementary groups for subporcess. The option runas must be specified together with this option. :param capture_error: Capture stderr :param encoding: For Python 3, the encoding to use for output, error_output, and (if it's not bytes) stdin. If None, the current encoding according to locale is used. :param redirect_output: Redirect (error) output to standard (error) output. :return: An object with these attributes: `returncode`: The process' exit status `output` and `error_output`: captured output, as strings. Under Python 3, these are encoded with the given `encoding`. None unless `capture_output` or `capture_error`, respectively, are given `raw_output`, `raw_error_output`: captured output, as bytes. `output_log` and `error_log`: The captured output, as strings, with any unencodable characters discarded. These should only be used for logging or error messages. If skip_output is given, all output-related attributes on the result (that is, all except `returncode`) are None. For backwards compatibility, the return value can also be used as a (output, error_output, returncode) triple. """ assert isinstance(suplementary_groups, list) p_in = None p_out = None p_err = None if isinstance(nolog, six.string_types): # We expect a tuple (or list, or other iterable) of nolog strings. # Passing just a single string is bad: strings are iterable, so this # would result in every individual character of that string being # replaced by XXXXXXXX. # This is a sanity check to prevent that. raise ValueError('nolog must be a tuple of strings.') if skip_output and (capture_output or capture_error): raise ValueError('skip_output is incompatible with ' 'capture_output or capture_error') if redirect_output and (capture_output or capture_error): raise ValueError('redirect_output is incompatible with ' 'capture_output or capture_error') if skip_output and redirect_output: raise ValueError('skip_output is incompatible with redirect_output') if env is None: # copy default env env = copy.deepcopy(os.environ) env["PATH"] = "/bin:/sbin:/usr/kerberos/bin:/usr/kerberos/sbin:/usr/bin:/usr/sbin" if stdin: p_in = subprocess.PIPE if skip_output: p_out = p_err = open(paths.DEV_NULL, 'w') elif redirect_output: p_out = sys.stdout p_err = sys.stderr else: p_out = subprocess.PIPE p_err = subprocess.PIPE if encoding is None: encoding = locale.getpreferredencoding() if six.PY3 and isinstance(stdin, str): stdin = stdin.encode(encoding) if timeout: # If a timeout was provided, use the timeout command # to execute the requested command. args[0:0] = [paths.BIN_TIMEOUT, str(timeout)] arg_string = nolog_replace(' '.join(_log_arg(a) for a in args), nolog) root_logger.debug('Starting external process') root_logger.debug('args=%s' % arg_string) preexec_fn = None if runas is not None: pent = pwd.getpwnam(runas) suplementary_gids = [ grp.getgrnam(group).gr_gid for group in suplementary_groups ] root_logger.debug('runas=%s (UID %d, GID %s)', runas, pent.pw_uid, pent.pw_gid) if suplementary_groups: for group, gid in zip(suplementary_groups, suplementary_gids): root_logger.debug('suplementary_group=%s (GID %d)', group, gid) preexec_fn = lambda: ( os.setgroups(suplementary_gids), os.setregid(pent.pw_gid, pent.pw_gid), os.setreuid(pent.pw_uid, pent.pw_uid), ) try: p = subprocess.Popen(args, stdin=p_in, stdout=p_out, stderr=p_err, close_fds=True, env=env, cwd=cwd, preexec_fn=preexec_fn) stdout, stderr = p.communicate(stdin) except KeyboardInterrupt: root_logger.debug('Process interrupted') p.wait() raise except: root_logger.debug('Process execution failed') raise finally: if skip_output: p_out.close() # pylint: disable=E1103 if timeout and p.returncode == 124: root_logger.debug('Process did not complete before timeout') root_logger.debug('Process finished, return code=%s', p.returncode) # The command and its output may include passwords that we don't want # to log. Replace those. if skip_output or redirect_output: output_log = None error_log = None else: if six.PY3: output_log = stdout.decode(locale.getpreferredencoding(), errors='replace') else: output_log = stdout if six.PY3: error_log = stderr.decode(locale.getpreferredencoding(), errors='replace') else: error_log = stderr output_log = nolog_replace(output_log, nolog) root_logger.debug('stdout=%s' % output_log) error_log = nolog_replace(error_log, nolog) root_logger.debug('stderr=%s' % error_log) if capture_output: if six.PY2: output = stdout else: output = stdout.encode(encoding) else: output = None if capture_error: if six.PY2: error_output = stderr else: error_output = stderr.encode(encoding) else: error_output = None if p.returncode != 0 and raiseonerr: raise CalledProcessError(p.returncode, arg_string, str(output)) result = _RunResult(output, error_output, p.returncode) result.raw_output = stdout result.raw_error_output = stderr result.output_log = output_log result.error_log = error_log return result def nolog_replace(string, nolog): """Replace occurences of strings given in `nolog` with XXXXXXXX""" for value in nolog: if not isinstance(value, six.string_types): continue quoted = urllib.parse.quote(value) shquoted = shell_quote(value) for nolog_value in (shquoted, value, quoted): string = string.replace(nolog_value, 'XXXXXXXX') return string def file_exists(filename): try: mode = os.stat(filename)[stat.ST_MODE] if stat.S_ISREG(mode): return True else: return False except: return False def dir_exists(filename): try: mode = os.stat(filename)[stat.ST_MODE] if stat.S_ISDIR(mode): return True else: return False except: return False def install_file(fname, dest): if file_exists(dest): os.rename(dest, dest + ".orig") shutil.move(fname, dest) def backup_file(fname): if file_exists(fname): os.rename(fname, fname + ".orig") def _ensure_nonempty_string(string, message): if not isinstance(string, str) or not string: raise ValueError(message) # uses gpg to compress and encrypt a file def encrypt_file(source, dest, password, workdir = None): _ensure_nonempty_string(source, 'Missing Source File') #stat it so that we get back an exception if it does no t exist os.stat(source) _ensure_nonempty_string(dest, 'Missing Destination File') _ensure_nonempty_string(password, 'Missing Password') #create a tempdir so that we can clean up with easily tempdir = tempfile.mkdtemp('', 'ipa-', workdir) gpgdir = tempdir+"/.gnupg" try: try: #give gpg a fake dir so that we can leater remove all #the cruft when we clean up the tempdir os.mkdir(gpgdir) args = [paths.GPG_AGENT, '--batch', '--homedir', gpgdir, '--daemon', paths.GPG, '--batch', '--homedir', gpgdir, '--passphrase-fd', '0', '--yes', '--no-tty', '-o', dest, '-c', source] run(args, password, skip_output=True) except: raise finally: #job done, clean up shutil.rmtree(tempdir, ignore_errors=True) def decrypt_file(source, dest, password, workdir = None): _ensure_nonempty_string(source, 'Missing Source File') #stat it so that we get back an exception if it does no t exist os.stat(source) _ensure_nonempty_string(dest, 'Missing Destination File') _ensure_nonempty_string(password, 'Missing Password') #create a tempdir so that we can clean up with easily tempdir = tempfile.mkdtemp('', 'ipa-', workdir) gpgdir = tempdir+"/.gnupg" try: try: #give gpg a fake dir so that we can leater remove all #the cruft when we clean up the tempdir os.mkdir(gpgdir) args = [paths.GPG_AGENT, '--batch', '--homedir', gpgdir, '--daemon', paths.GPG, '--batch', '--homedir', gpgdir, '--passphrase-fd', '0', '--yes', '--no-tty', '-o', dest, '-d', source] run(args, password, skip_output=True) except: raise finally: #job done, clean up shutil.rmtree(tempdir, ignore_errors=True) class CIDict(dict): """ Case-insensitive but case-respecting dictionary. This code is derived from python-ldap's cidict.py module, written by stroeder: http://python-ldap.sourceforge.net/ This version extends 'dict' so it works properly with TurboGears. If you extend UserDict, isinstance(foo, dict) returns false. """ def __init__(self, default=None, **kwargs): super(CIDict, self).__init__() self._keys = {} # mapping of lowercased keys to proper case if default: self.update(default) if kwargs: self.update(kwargs) def __getitem__(self, key): return super(CIDict, self).__getitem__(key.lower()) def __setitem__(self, key, value, seen_keys=None): """cidict[key] = value The ``seen_keys`` argument is used by ``update()`` to keep track of duplicate keys. It should be an initially empty set that is passed to all calls to __setitem__ that should not set duplicate keys. """ lower_key = key.lower() if seen_keys is not None: if lower_key in seen_keys: raise ValueError('Duplicate key in update: %s' % key) seen_keys.add(lower_key) self._keys[lower_key] = key return super(CIDict, self).__setitem__(lower_key, value) def __delitem__(self, key): lower_key = key.lower() del self._keys[lower_key] return super(CIDict, self).__delitem__(lower_key) def update(self, new=None, **kwargs): """Update self from dict/iterable new and kwargs Functions like ``dict.update()``. Neither ``new`` nor ``kwargs`` may contain two keys that only differ in case, as this situation would result in loss of data. """ seen = set() if new: try: keys = new.keys except AttributeError: self.update(dict(new)) else: for key in keys(): self.__setitem__(key, new[key], seen) seen = set() for key, value in kwargs.items(): self.__setitem__(key, value, seen) def __contains__(self, key): return super(CIDict, self).__contains__(key.lower()) if six.PY2: def has_key(self, key): return super(CIDict, self).has_key(key.lower()) def get(self, key, failobj=None): try: return self[key] except KeyError: return failobj def __iter__(self): return six.itervalues(self._keys) def keys(self): if six.PY2: return list(self.iterkeys()) else: return self.iterkeys() def items(self): if six.PY2: return list(self.iteritems()) else: return self.iteritems() def values(self): if six.PY2: return list(self.itervalues()) else: return self.itervalues() def copy(self): """Returns a shallow copy of this CIDict""" return CIDict(list(self.items())) def iteritems(self): return ((k, self[k]) for k in six.itervalues(self._keys)) def iterkeys(self): return six.itervalues(self._keys) def itervalues(self): return (v for k, v in six.iteritems(self)) def setdefault(self, key, value=None): try: return self[key] except KeyError: self[key] = value return value def pop(self, key, *args): try: value = self[key] del self[key] return value except KeyError: if len(args) == 1: return args[0] raise def popitem(self): (lower_key, value) = super(CIDict, self).popitem() key = self._keys[lower_key] del self._keys[lower_key] return (key, value) def clear(self): self._keys.clear() return super(CIDict, self).clear() def viewitems(self): raise NotImplementedError('CIDict.viewitems is not implemented') def viewkeys(self): raise NotImplementedError('CIDict.viewkeys is not implemented') def viewvvalues(self): raise NotImplementedError('CIDict.viewvvalues is not implemented') class GeneralizedTimeZone(datetime.tzinfo): """This class is a basic timezone wrapper for the offset specified in a Generalized Time. It is dst-ignorant.""" def __init__(self,offsetstr="Z"): super(GeneralizedTimeZone, self).__init__() self.name = offsetstr self.houroffset = 0 self.minoffset = 0 if offsetstr == "Z": self.houroffset = 0 self.minoffset = 0 else: if (len(offsetstr) >= 3) and re.match(r'[-+]\d\d', offsetstr): self.houroffset = int(offsetstr[0:3]) offsetstr = offsetstr[3:] if (len(offsetstr) >= 2) and re.match(r'\d\d', offsetstr): self.minoffset = int(offsetstr[0:2]) offsetstr = offsetstr[2:] if len(offsetstr) > 0: raise ValueError() if self.houroffset < 0: self.minoffset *= -1 def utcoffset(self, dt): return datetime.timedelta(hours=self.houroffset, minutes=self.minoffset) def dst(self): return datetime.timedelta(0) def tzname(self): return self.name def parse_generalized_time(timestr): """Parses are Generalized Time string (as specified in X.680), returning a datetime object. Generalized Times are stored inside the krbPasswordExpiration attribute in LDAP. This method doesn't attempt to be perfect wrt timezones. If python can't be bothered to implement them, how can we...""" if len(timestr) < 8: return None try: date = timestr[:8] time = timestr[8:] year = int(date[:4]) month = int(date[4:6]) day = int(date[6:8]) hour = min = sec = msec = 0 tzone = None if (len(time) >= 2) and re.match(r'\d', time[0]): hour = int(time[:2]) time = time[2:] if len(time) >= 2 and (time[0] == "," or time[0] == "."): hour_fraction = "." time = time[1:] while (len(time) > 0) and re.match(r'\d', time[0]): hour_fraction += time[0] time = time[1:] total_secs = int(float(hour_fraction) * 3600) min, sec = divmod(total_secs, 60) if (len(time) >= 2) and re.match(r'\d', time[0]): min = int(time[:2]) time = time[2:] if len(time) >= 2 and (time[0] == "," or time[0] == "."): min_fraction = "." time = time[1:] while (len(time) > 0) and re.match(r'\d', time[0]): min_fraction += time[0] time = time[1:] sec = int(float(min_fraction) * 60) if (len(time) >= 2) and re.match(r'\d', time[0]): sec = int(time[:2]) time = time[2:] if len(time) >= 2 and (time[0] == "," or time[0] == "."): sec_fraction = "." time = time[1:] while (len(time) > 0) and re.match(r'\d', time[0]): sec_fraction += time[0] time = time[1:] msec = int(float(sec_fraction) * 1000000) if (len(time) > 0): tzone = GeneralizedTimeZone(time) return datetime.datetime(year, month, day, hour, min, sec, msec, tzone) except ValueError: return None def ipa_generate_password(characters=None,pwd_len=None): ''' Generates password. Password cannot start or end with a whitespace character. It also cannot be formed by whitespace characters only. Length of password as well as string of characters to be used by generator could be optionaly specified by characters and pwd_len parameters, otherwise default values will be used: characters string will be formed by all printable non-whitespace characters and space, pwd_len will be equal to value of GEN_PWD_LEN. ''' if not characters: characters=string.digits + string.ascii_letters + string.punctuation + ' ' else: if characters.isspace(): raise ValueError("password cannot be formed by whitespaces only") if not pwd_len: pwd_len = GEN_PWD_LEN upper_bound = len(characters) - 1 rndpwd = '' r = random.SystemRandom() for x in range(pwd_len): rndchar = characters[r.randint(0,upper_bound)] if (x == 0) or (x == pwd_len-1): while rndchar.isspace(): rndchar = characters[r.randint(0,upper_bound)] rndpwd += rndchar return rndpwd def user_input(prompt, default = None, allow_empty = True): if default == None: while True: try: ret = input("%s: " % prompt) if allow_empty or ret.strip(): return ret.strip() except EOFError: if allow_empty: return '' raise RuntimeError("Failed to get user input") if isinstance(default, six.string_types): while True: try: ret = input("%s [%s]: " % (prompt, default)) if not ret and (allow_empty or default): return default elif ret.strip(): return ret.strip() except EOFError: return default if isinstance(default, bool): choice = "yes" if default else "no" while True: try: ret = input("%s [%s]: " % (prompt, choice)) ret = ret.strip() if not ret: return default elif ret.lower()[0] == "y": return True elif ret.lower()[0] == "n": return False except EOFError: return default if isinstance(default, int): while True: try: ret = input("%s [%s]: " % (prompt, default)) ret = ret.strip() if not ret: return default ret = int(ret) except ValueError: pass except EOFError: return default else: return ret def host_port_open(host, port, socket_type=socket.SOCK_STREAM, socket_timeout=None): for res in socket.getaddrinfo(host, port, socket.AF_UNSPEC, socket_type): af, socktype, proto, canonname, sa = res try: try: s = socket.socket(af, socktype, proto) except socket.error: s = None continue if socket_timeout is not None: s.settimeout(socket_timeout) s.connect(sa) if socket_type == socket.SOCK_DGRAM: s.send('') s.recv(512) return True except socket.error as e: pass finally: if s: s.close() return False def bind_port_responder(port, socket_type=socket.SOCK_STREAM, socket_timeout=None, responder_data=None): host = None # all available interfaces last_socket_error = None # At first try to create IPv6 socket as it is able to accept both IPv6 and # IPv4 connections (when not turned off) families = (socket.AF_INET6, socket.AF_INET) s = None for family in families: try: addr_infos = socket.getaddrinfo(host, port, family, socket_type, 0, socket.AI_PASSIVE) except socket.error as e: last_socket_error = e continue for res in addr_infos: af, socktype, proto, canonname, sa = res try: s = socket.socket(af, socktype, proto) except socket.error as e: last_socket_error = e s = None continue if socket_timeout is not None: s.settimeout(1) if af == socket.AF_INET6: try: # Make sure IPv4 clients can connect to IPv6 socket s.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, 0) except socket.error: pass if socket_type == socket.SOCK_STREAM: s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) try: s.bind(sa) while True: if socket_type == socket.SOCK_STREAM: s.listen(1) connection, client_address = s.accept() try: if responder_data: connection.sendall(responder_data) finally: connection.close() elif socket_type == socket.SOCK_DGRAM: data, addr = s.recvfrom(1) if responder_data: s.sendto(responder_data, addr) except socket.timeout: # Timeout is expectable as it was requested by caller, raise # the exception back to him raise except socket.error as e: last_socket_error = e s.close() s = None continue finally: if s: s.close() if s is None and last_socket_error is not None: raise last_socket_error # pylint: disable=E0702 def host_exists(host): """ Resolve the host to see if it exists. Returns True/False """ try: socket.getaddrinfo(host, 80) except socket.gaierror: return False else: return True def reverse_record_exists(ip_address): """ Checks if IP address have some reverse record somewhere. Does not care where it points. Returns True/False """ reverse = reversename.from_address(str(ip_address)) try: resolver.query(reverse, "PTR") except DNSException: # really don't care what exception, PTR is simply unresolvable return False return True def check_zone_overlap(zone, raise_on_error=True): root_logger.info("Checking DNS domain %s, please wait ..." % zone) if not isinstance(zone, DNSName): zone = DNSName(zone).make_absolute() # automatic empty zones always exist so checking them is pointless, # do not report them to avoid meaningless error messages if is_auto_empty_zone(zone): return try: containing_zone = resolver.zone_for_name(zone) except DNSException as e: msg = ("DNS check for domain %s failed: %s." % (zone, e)) if raise_on_error: raise ValueError(msg) else: root_logger.warning(msg) return if containing_zone == zone: try: ns = [ans.to_text() for ans in resolver.query(zone, 'NS')] except DNSException as e: root_logger.debug("Failed to resolve nameserver(s) for domain" " {0}: {1}".format(zone, e)) ns = [] msg = u"DNS zone {0} already exists in DNS".format(zone) if ns: msg += u" and is handled by server(s): {0}".format(', '.join(ns)) raise ValueError(msg) def is_auto_empty_zone(zone): assert isinstance(zone, DNSName) automatic_empty_zones = [DNSName(aez).make_absolute() for aez in [ # RFC 1918 "10.IN-ADDR.ARPA", "16.172.IN-ADDR.ARPA", "17.172.IN-ADDR.ARPA", "18.172.IN-ADDR.ARPA", "19.172.IN-ADDR.ARPA", "20.172.IN-ADDR.ARPA", "21.172.IN-ADDR.ARPA", "22.172.IN-ADDR.ARPA", "23.172.IN-ADDR.ARPA", "24.172.IN-ADDR.ARPA", "25.172.IN-ADDR.ARPA", "26.172.IN-ADDR.ARPA", "27.172.IN-ADDR.ARPA", "28.172.IN-ADDR.ARPA", "29.172.IN-ADDR.ARPA", "30.172.IN-ADDR.ARPA", "31.172.IN-ADDR.ARPA", "168.192.IN-ADDR.ARPA", # RFC 6598 "64.100.IN-ADDR.ARPA", "65.100.IN-ADDR.ARPA", "66.100.IN-ADDR.ARPA", "67.100.IN-ADDR.ARPA", "68.100.IN-ADDR.ARPA", "69.100.IN-ADDR.ARPA", "70.100.IN-ADDR.ARPA", "71.100.IN-ADDR.ARPA", "72.100.IN-ADDR.ARPA", "73.100.IN-ADDR.ARPA", "74.100.IN-ADDR.ARPA", "75.100.IN-ADDR.ARPA", "76.100.IN-ADDR.ARPA", "77.100.IN-ADDR.ARPA", "78.100.IN-ADDR.ARPA", "79.100.IN-ADDR.ARPA", "80.100.IN-ADDR.ARPA", "81.100.IN-ADDR.ARPA", "82.100.IN-ADDR.ARPA", "83.100.IN-ADDR.ARPA", "84.100.IN-ADDR.ARPA", "85.100.IN-ADDR.ARPA", "86.100.IN-ADDR.ARPA", "87.100.IN-ADDR.ARPA", "88.100.IN-ADDR.ARPA", "89.100.IN-ADDR.ARPA", "90.100.IN-ADDR.ARPA", "91.100.IN-ADDR.ARPA", "92.100.IN-ADDR.ARPA", "93.100.IN-ADDR.ARPA", "94.100.IN-ADDR.ARPA", "95.100.IN-ADDR.ARPA", "96.100.IN-ADDR.ARPA", "97.100.IN-ADDR.ARPA", "98.100.IN-ADDR.ARPA", "99.100.IN-ADDR.ARPA", "100.100.IN-ADDR.ARPA", "101.100.IN-ADDR.ARPA", "102.100.IN-ADDR.ARPA", "103.100.IN-ADDR.ARPA", "104.100.IN-ADDR.ARPA", "105.100.IN-ADDR.ARPA", "106.100.IN-ADDR.ARPA", "107.100.IN-ADDR.ARPA", "108.100.IN-ADDR.ARPA", "109.100.IN-ADDR.ARPA", "110.100.IN-ADDR.ARPA", "111.100.IN-ADDR.ARPA", "112.100.IN-ADDR.ARPA", "113.100.IN-ADDR.ARPA", "114.100.IN-ADDR.ARPA", "115.100.IN-ADDR.ARPA", "116.100.IN-ADDR.ARPA", "117.100.IN-ADDR.ARPA", "118.100.IN-ADDR.ARPA", "119.100.IN-ADDR.ARPA", "120.100.IN-ADDR.ARPA", "121.100.IN-ADDR.ARPA", "122.100.IN-ADDR.ARPA", "123.100.IN-ADDR.ARPA", "124.100.IN-ADDR.ARPA", "125.100.IN-ADDR.ARPA", "126.100.IN-ADDR.ARPA", "127.100.IN-ADDR.ARPA", # RFC 5735 and RFC 5737 "0.IN-ADDR.ARPA", "127.IN-ADDR.ARPA", "254.169.IN-ADDR.ARPA", "2.0.192.IN-ADDR.ARPA", "100.51.198.IN-ADDR.ARPA", "113.0.203.IN-ADDR.ARPA", "255.255.255.255.IN-ADDR.ARPA", # Local IPv6 Unicast Addresses "0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.IP6.ARPA", "1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.IP6.ARPA", # LOCALLY ASSIGNED LOCAL ADDRESS SCOPE "D.F.IP6.ARPA", "8.E.F.IP6.ARPA", "9.E.F.IP6.ARPA", "A.E.F.IP6.ARPA", "B.E.F.IP6.ARPA", # Example Prefix, RFC 3849. "8.B.D.0.1.0.0.2.IP6.ARPA", # RFC 7534 "EMPTY.AS112.ARPA", ]] return zone in automatic_empty_zones def get_ipa_basedn(conn): """ Get base DN of IPA suffix in given LDAP server. None is returned if the suffix is not found :param conn: Bound LDAPClient that will be used for searching """ entry = conn.get_entry( DN(), attrs_list=['defaultnamingcontext', 'namingcontexts']) # FIXME: import ipalib here to prevent import loops from ipalib import errors contexts = entry['namingcontexts'] if 'defaultnamingcontext' in entry: # If there is a defaultNamingContext examine that one first default = entry.single_value['defaultnamingcontext'] if default in contexts: contexts.remove(default) contexts.insert(0, default) for context in contexts: root_logger.debug("Check if naming context '%s' is for IPA" % context) try: [entry] = conn.get_entries( DN(context), conn.SCOPE_BASE, "(info=IPA*)") except errors.NotFound: root_logger.debug("LDAP server did not return info attribute to " "check for IPA version") continue info = entry.single_value['info'].lower() if info != IPA_BASEDN_INFO: root_logger.debug("Detected IPA server version (%s) did not match the client (%s)" \ % (info, IPA_BASEDN_INFO)) continue root_logger.debug("Naming context '%s' is a valid IPA context" % context) return DN(context) return None def config_replace_variables(filepath, replacevars=dict(), appendvars=dict()): """ Take a key=value based configuration file, and write new version with certain values replaced or appended All (key,value) pairs from replacevars and appendvars that were not found in the configuration file, will be added there. It is responsibility of a caller to ensure that replacevars and appendvars do not overlap. It is responsibility of a caller to back up file. returns dictionary of affected keys and their previous values One have to run restore_context(filepath) afterwards or security context of the file will not be correct after modification """ pattern = re.compile(''' (^ \s* (?P