IntenseWebs/freeipa
3
0
Fork 0
mirror of https://salsa.debian.org/freeipa-team/freeipa.git synced 2024-12-23 07:33:27 -06:00
Code Issues Packages Projects Releases Wiki Activity
d0b420f6dd
freeipa/ipapython/ipautil.py
Alexander Bokovoy d85e0550ca ipapython.ipautil.run: allow skipping stdout/stderr logging 
There are cases when output from a utility run contains sensitive
content that is better to avoid logging. For example, klist can be told
to show actual encryption keys with -K option. Redacting them out with
nolog option to ipapython.ipautil.run() is not possible because
replacement routine expects exact matches.

Introduce two boolean options that allow to skip printing output from
the utility being run:
  -- nolog_output: skip printing captured stdout
  -- nolog_error: skip printing captured stderr

These options default to False (thus, stdout/stderr content will
continue to be printed). In case they were set to True, corresponding
line will contain

   stdout=<REDACTED>

or

   stderr=<REDACTED>

Fixes: https://pagure.io/freeipa/issue/3999
Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>
Reviewed-By: Christian Heimes <cheimes@redhat.com>
2019-06-29 11:00:28 +03:00

1646 lines
54 KiB
Python
Raw Blame History

# Authors: Simo Sorce <ssorce@redhat.com>
#
# Copyright (C) 2007-2016 Red Hat, Inc.
# 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 <http://www.gnu.org/licenses/>.
#
from __future__ import print_function
import codecs
import logging
import string
import tempfile
import subprocess
import random
import math
import os
import sys
import errno
import copy
import shutil
import socket
import re
import datetime
import netaddr
import time
import pwd
import grp
from contextlib import contextmanager
import locale
import collections
import urllib
from dns import resolver, reversename
from dns.exception import DNSException
import six
from six.moves import input
try:
import netifaces
except ImportError:
netifaces = None
from ipapython.dn import DN
from ipaplatform.paths import paths
logger = logging.getLogger(__name__)
# only for OTP password that is manually retyped by user
TMP_PWD_ENTROPY_BITS = 128
PROTOCOL_NAMES = {
socket.SOCK_STREAM: 'tcp',
socket.SOCK_DGRAM: 'udp'
}
InterfaceDetails = collections.namedtuple(
'InterfaceDetails', [
'name', # interface name
'ifnet' # network details of interface
])
class UnsafeIPAddress(netaddr.IPAddress):
"""Any valid IP address with or without netmask."""
# 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):
if isinstance(addr, UnsafeIPAddress):
self._net = addr._net
super(UnsafeIPAddress, self).__init__(addr,
flags=self.netaddr_ip_flags)
return
elif isinstance(addr, netaddr.IPAddress):
self._net = None # no information about netmask
super(UnsafeIPAddress, self).__init__(addr,
flags=self.netaddr_ip_flags)
return
elif isinstance(addr, netaddr.IPNetwork):
self._net = addr
super(UnsafeIPAddress, self).__init__(self._net.ip,
flags=self.netaddr_ip_flags)
return
# option of last resort: parse it as string
self._net = None
addr = str(addr)
try:
try:
addr = netaddr.IPAddress(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.
addr, sep, _foo = addr.partition('%')
if sep != '%':
raise
addr = netaddr.IPAddress(addr, flags=self.netaddr_ip_flags)
if addr.version != 6:
raise
except ValueError:
self._net = netaddr.IPNetwork(addr, flags=self.netaddr_ip_flags)
addr = self._net.ip
super(UnsafeIPAddress, self).__init__(addr,
flags=self.netaddr_ip_flags)
def __getstate__(self):
state = {
'_net': self._net,
'super_state': super(UnsafeIPAddress, self).__getstate__(),
}
return state
def __setstate__(self, state):
super(UnsafeIPAddress, self).__setstate__(state['super_state'])
self._net = state['_net']
class CheckedIPAddress(UnsafeIPAddress):
"""IPv4 or IPv6 address with additional constraints.
Reserved or link-local addresses are never accepted.
"""
def __init__(self, addr, parse_netmask=True,
allow_loopback=False, allow_multicast=False):
try:
super(CheckedIPAddress, self).__init__(addr)
except netaddr.core.AddrFormatError as e:
raise ValueError(e)
if isinstance(addr, CheckedIPAddress):
self.prefixlen = addr.prefixlen
return
if not parse_netmask and self._net:
raise ValueError(
"netmask and prefix length not allowed here: {}".format(addr))
if self.version not in (4, 6):
raise ValueError("unsupported IP version {}".format(self.version))
if not allow_loopback and self.is_loopback():
raise ValueError("cannot use loopback IP address {}".format(addr))
if (not self.is_loopback() and self.is_reserved()) \
or self in netaddr.ip.IPV4_6TO4:
raise ValueError(
"cannot use IANA reserved IP address {}".format(addr))
if self.is_link_local():
raise ValueError(
"cannot use link-local IP address {}".format(addr))
if not allow_multicast and self.is_multicast():
raise ValueError("cannot use multicast IP address {}".format(addr))
if self._net is None:
if self.version == 4:
self._net = netaddr.IPNetwork(
netaddr.cidr_abbrev_to_verbose(str(self)))
elif self.version == 6:
self._net = netaddr.IPNetwork(str(self) + '/64')
self.prefixlen = self._net.prefixlen
def __getstate__(self):
state = {
'prefixlen': self.prefixlen,
'super_state': super(CheckedIPAddress, self).__getstate__(),
}
return state
def __setstate__(self, state):
super(CheckedIPAddress, self).__setstate__(state['super_state'])
self.prefixlen = state['prefixlen']
def is_network_addr(self):
return self == self._net.network
def is_broadcast_addr(self):
return self.version == 4 and self == self._net.broadcast
def get_matching_interface(self):
"""Find matching local interface for address
:return: InterfaceDetails named tuple or None if no interface has
this address
"""
if netifaces is None:
raise ImportError("netifaces")
logger.debug("Searching for an interface of IP address: %s", self)
if self.version == 4:
family = netifaces.AF_INET
elif self.version == 6:
family = netifaces.AF_INET6
else:
raise ValueError(
"Unsupported address family ({})".format(self.version)
)
for interface in netifaces.interfaces():
for ifdata in netifaces.ifaddresses(interface).get(family, []):
# link-local addresses contain '%suffix' that causes parse
# errors in IPNetwork
ifaddr = ifdata['addr'].split(u'%', 1)[0]
# newer versions of netifaces provide IPv6 netmask in format
# 'ffff:ffff:ffff:ffff::/64'. We have to split and use prefix
# or the netmask with older versions
ifmask = ifdata['netmask'].split(u'/')[-1]
ifaddrmask = '{addr}/{netmask}'.format(
addr=ifaddr,
netmask=ifmask
)
logger.debug(
"Testing local IP address: %s (interface: %s)",
ifaddrmask, interface)
ifnet = netaddr.IPNetwork(ifaddrmask)
if ifnet.ip == self:
return InterfaceDetails(interface, ifnet)
return None
def set_ip_net(self, ifnet):
"""Set IP Network details for this address. IPNetwork is valid only
locally, so this should be set only for local IP addresses
:param ifnet: netaddr.IPNetwork object with information about IP
network where particula address belongs locally
"""
assert isinstance(ifnet, netaddr.IPNetwork)
self._net = ifnet
class CheckedIPAddressLoopback(CheckedIPAddress):
"""IPv4 or IPv6 address with additional constraints with
possibility to use a loopback IP.
Reserved or link-local addresses are never accepted.
"""
def __init__(self, addr, parse_netmask=True, allow_multicast=False):
super(CheckedIPAddressLoopback, self).__init__(
addr, parse_netmask=parse_netmask,
allow_multicast=allow_multicast,
allow_loopback=True)
if self.is_loopback():
# print is being used instead of a logger, because at this
# moment, in execution process, there is no logger configured
print("WARNING: You are using a loopback IP: {}".format(addr),
file=sys.stderr)
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('w+')
fd.write(txt)
fd.flush()
return fd
def flush_sync(f):
"""Flush and fsync file to disk
:param f: a file object with fileno and name
"""
# flush file buffer to file descriptor
f.flush()
# flush Kernel buffer to disk
os.fsync(f.fileno())
# sync metadata in directory
dirname = os.path.dirname(os.path.abspath(f.name))
dirfd = os.open(dirname, os.O_RDONLY | os.O_DIRECTORY)
try:
os.fsync(dirfd)
finally:
os.close(dirfd)
def shell_quote(string):
if isinstance(string, str):
return "'" + string.replace("'", "'\\''") + "'"
else:
return b"'" + string.replace(b"'", b"'\\''") + b"'"
class _RunResult(collections.namedtuple('_RunResult',
'output error_output returncode')):
"""Result of ipautil.run"""
class CalledProcessError(subprocess.CalledProcessError):
"""CalledProcessError with stderr
Hold stderr of failed call and print it in repr() to simplify debugging.
"""
def __init__(self, returncode, cmd, output=None, stderr=None):
super(CalledProcessError, self).__init__(returncode, cmd, output)
self.stderr = stderr
def __str__(self):
args = [
self.__class__.__name__, '('
'Command {!s} '.format(self.cmd),
'returned non-zero exit status {!r}'.format(self.returncode)
]
if self.stderr is not None:
args.append(': {!r}'.format(self.stderr))
args.append(')')
return ''.join(args)
__repr__ = __str__
def run(args, stdin=None, raiseonerr=True, nolog=(), env=None,
capture_output=False, skip_output=False, cwd=None,
runas=None, suplementary_groups=[],
capture_error=False, encoding=None, redirect_output=False,
umask=None, nolog_output=False, nolog_error=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
['/usr/bin/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 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 nolog_output: do not log stdout even if it is being captured
:param nolog_error: do not log stderr even if it is being captured
: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.
:param umask: Set file-creation mask before running the command.
: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, str):
# 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(os.devnull, '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)
arg_string = nolog_replace(repr(args), nolog)
logger.debug('Starting external process')
logger.debug('args=%s', arg_string)
if runas is not None:
pent = pwd.getpwnam(runas)
suplementary_gids = [
grp.getgrnam(sgroup).gr_gid for sgroup in suplementary_groups
]
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):
logger.debug('suplementary_group=%s (GID %d)', group, gid)
def preexec_fn():
if runas is not None:
os.setgroups(suplementary_gids)
os.setregid(pent.pw_gid, pent.pw_gid)
os.setreuid(pent.pw_uid, pent.pw_uid)
if umask:
os.umask(umask)
try:
# pylint: disable=subprocess-popen-preexec-fn
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:
logger.debug('Process interrupted')
p.wait()
raise
except:
logger.debug('Process execution failed')
raise
finally:
if skip_output:
p_out.close() # pylint: disable=E1103
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)
if nolog_output:
logger.debug('stdout=<REDACTED>')
else:
logger.debug('stdout=%s', output_log)
error_log = nolog_replace(error_log, nolog)
if nolog_error:
logger.debug('stderr=<REDACTED>')
else:
logger.debug('stderr=%s', error_log)
if capture_output:
if six.PY2:
output = stdout
else:
output = stdout.decode(encoding)
else:
output = None
if capture_error:
if six.PY2:
error_output = stderr
else:
error_output = stderr.decode(encoding)
else:
error_output = None
if p.returncode != 0 and raiseonerr:
raise CalledProcessError(
p.returncode, arg_string, output_log, error_log
)
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 value or not isinstance(value, str):
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 install_file(fname, dest):
# SELinux: use copy to keep the right context
if os.path.isfile(dest):
os.rename(dest, dest + ".orig")
shutil.copy(fname, dest)
os.remove(fname)
def backup_file(fname):
if os.path.isfile(fname):
os.rename(fname, fname + ".orig")
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):
# pylint: disable=no-member
return super(CIDict, self).has_key(key.lower())
# pylint: enable=no-member
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(entropy_bits=256, uppercase=1, lowercase=1, digits=1,
special=1, min_len=0):
"""
Generate token containing at least `entropy_bits` bits and with the given
character restraints.
:param entropy_bits:
The minimal number of entropy bits attacker has to guess:
128 bits entropy: secure
256 bits of entropy: secure enough if you care about quantum
computers
Integer values specify minimal number of characters from given
character class and length.
Value None prevents given character from appearing in the token.
Example:
TokenGenerator(uppercase=3, lowercase=3, digits=0, special=None)
At least 3 upper and 3 lower case ASCII chars, may contain digits,
no special chars.
"""
special_chars = '!$%&()*+,-./:;<>?@[]^_{|}~'
pwd_charsets = {
'uppercase': {
'chars': string.ascii_uppercase,
'entropy': math.log(len(string.ascii_uppercase), 2)
},
'lowercase': {
'chars': string.ascii_lowercase,
'entropy': math.log(len(string.ascii_lowercase), 2)
},
'digits': {
'chars': string.digits,
'entropy': math.log(len(string.digits), 2)
},
'special': {
'chars': special_chars,
'entropy': math.log(len(special_chars), 2)
},
}
req_classes = dict(
uppercase=uppercase,
lowercase=lowercase,
digits=digits,
special=special
)
# 'all' class is used when adding entropy to too-short tokens
# it contains characters from all allowed classes
pwd_charsets['all'] = {
'chars': ''.join([
charclass['chars'] for charclass_name, charclass
in pwd_charsets.items()
if req_classes[charclass_name] is not None
])
}
pwd_charsets['all']['entropy'] = math.log(
len(pwd_charsets['all']['chars']), 2)
rnd = random.SystemRandom()
todo_entropy = entropy_bits
password = u''
# Generate required character classes:
# The order of generated characters is fixed to comply with check in
# NSS function sftk_newPinCheck() in nss/lib/softoken/fipstokn.c.
for charclass_name in ['digits', 'uppercase', 'lowercase', 'special']:
charclass = pwd_charsets[charclass_name]
todo_characters = req_classes[charclass_name]
if todo_characters is None:
continue
while todo_characters > 0:
password += rnd.choice(charclass['chars'])
todo_entropy -= charclass['entropy']
todo_characters -= 1
# required character classes do not provide sufficient entropy
# or does not fulfill minimal length constraint
allchars = pwd_charsets['all']
while todo_entropy > 0 or len(password) < min_len:
password += rnd.choice(allchars['chars'])
todo_entropy -= allchars['entropy']
return password
def user_input(prompt, default = None, allow_empty = True):
if default is 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, str):
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
return None
def host_port_open(host, port, socket_type=socket.SOCK_STREAM,
socket_timeout=None, log_errors=False,
log_level=logging.DEBUG):
"""
host: either hostname or IP address;
if hostname is provided, port MUST be open on ALL resolved IPs
returns True is port is open, False otherwise
"""
port_open = True
# port has to be open on ALL resolved IPs
for res in socket.getaddrinfo(host, port, socket.AF_UNSPEC, socket_type):
af, socktype, proto, _canonname, sa = res
s = None
try:
s = socket.socket(af, socktype, proto)
if socket_timeout is not None:
s.settimeout(socket_timeout)
s.connect(sa)
if socket_type == socket.SOCK_DGRAM:
s.send(b'')
s.recv(512)
except socket.error:
port_open = False
if log_errors:
msg = ('Failed to connect to port %(port)s %(proto)s on '
'%(addr)s' % dict(port=port,
proto=PROTOCOL_NAMES[socket_type],
addr=sa[0]))
logger.log(log_level, msg)
finally:
if s is not None:
s.close()
return port_open
def check_port_bindable(port, socket_type=socket.SOCK_STREAM):
"""Check if a port is free and not bound by any other application
:param port: port number
:param socket_type: type (SOCK_STREAM for TCP, SOCK_DGRAM for UDP)
Returns True if the port is free, False otherwise
"""
if socket_type == socket.SOCK_STREAM:
proto = 'TCP'
elif socket_type == socket.SOCK_DGRAM:
proto = 'UDP'
else:
raise ValueError(socket_type)
# Detect dual stack or IPv4 single stack
try:
s = socket.socket(socket.AF_INET6, socket_type)
anyaddr = '::'
logger.debug(
"check_port_bindable: Checking IPv4/IPv6 dual stack and %s",
proto
)
except socket.error:
s = socket.socket(socket.AF_INET, socket_type)
anyaddr = ''
logger.debug("check_port_bindable: Checking IPv4 only and %s", proto)
# Attempt to bind
try:
if socket_type == socket.SOCK_STREAM:
# reuse TCP sockets in TIME_WAIT state
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, True)
s.bind((anyaddr, port))
except socket.error as e:
logger.debug(
"check_port_bindable: failed to bind to port %i/%s: %s",
port, proto, e
)
return False
else:
logger.debug(
"check_port_bindable: bind success: %i/%s", port, proto
)
return True
finally:
s.close()
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 config_replace_variables(filepath, replacevars=dict(), appendvars=dict(),
removevars=None):
"""
Take a key=value based configuration file, and write new version
with certain values replaced, appended, or removed.
All (key,value) pairs from replacevars and appendvars that were not found
in the configuration file, will be added there.
All entries in set removevars are removed.
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<option> [^\#;]+?)
(\s*=\s*)
(?P<value> .+?)?
(\s*((\#|;).*)?)?
$)''', re.VERBOSE)
orig_stat = os.stat(filepath)
old_values = dict()
temp_filename = None
with tempfile.NamedTemporaryFile(mode="w", delete=False) as new_config:
temp_filename = new_config.name
with open(filepath, 'r') as f:
for line in f:
new_line = line
m = pattern.match(line)
if m:
option, value = m.group('option', 'value')
if option is not None:
if replacevars and option in replacevars:
# replace value completely
new_line = u"%s=%s\n" % (option, replacevars[option])
old_values[option] = value
if appendvars and option in appendvars:
# append new value unless it is already existing in the original one
if not value:
new_line = u"%s=%s\n" % (option, appendvars[option])
elif value.find(appendvars[option]) == -1:
new_line = u"%s=%s %s\n" % (option, value, appendvars[option])
old_values[option] = value
if removevars and option in removevars:
old_values[option] = value
new_line = None
if new_line is not None:
new_config.write(new_line)
# Now add all options from replacevars and appendvars that were not found in the file
new_vars = replacevars.copy()
new_vars.update(appendvars)
newvars_view = set(new_vars.keys()) - set(old_values.keys())
append_view = (set(appendvars.keys()) - newvars_view)
for item in newvars_view:
new_config.write("%s=%s\n" % (item,new_vars[item]))
for item in append_view:
new_config.write("%s=%s\n" % (item,appendvars[item]))
new_config.flush()
# Make sure the resulting file is readable by others before installing it
os.fchmod(new_config.fileno(), orig_stat.st_mode)
os.fchown(new_config.fileno(), orig_stat.st_uid, orig_stat.st_gid)
# At this point new_config is closed but not removed due to 'delete=False' above
# Now, install the temporary file as configuration and ensure old version is available as .orig
# While .orig file is not used during uninstall, it is left there for administrator.
install_file(temp_filename, filepath)
return old_values
def inifile_replace_variables(filepath, section, replacevars=dict(), appendvars=dict()):
"""
Take a section-structured key=value based configuration file, and write new version
with certain values replaced or appended within the section
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('''
(^
\[
(?P<section> .+) \]
(\s+((\#|;).*)?)?
$)|(^
\s*
(?P<option> [^\#;]+?)
(\s*=\s*)
(?P<value> .+?)?
(\s*((\#|;).*)?)?
$)''', re.VERBOSE)
def add_options(config, replacevars, appendvars, oldvars):
# add all options from replacevars and appendvars that were not found in the file
new_vars = replacevars.copy()
new_vars.update(appendvars)
newvars_view = set(new_vars.keys()) - set(oldvars.keys())
append_view = (set(appendvars.keys()) - newvars_view)
for item in newvars_view:
config.write("%s=%s\n" % (item,new_vars[item]))
for item in append_view:
config.write("%s=%s\n" % (item,appendvars[item]))
orig_stat = os.stat(filepath)
old_values = dict()
temp_filename = None
with tempfile.NamedTemporaryFile(mode='w', delete=False) as new_config:
temp_filename = new_config.name
with open(filepath, 'r') as f:
in_section = False
finished = False
line_idx = 1
for line in f:
line_idx = line_idx + 1
new_line = line
m = pattern.match(line)
if m:
sect, option, value = m.group('section', 'option', 'value')
if in_section and sect is not None:
# End of the searched section, add remaining options
add_options(new_config, replacevars, appendvars, old_values)
finished = True
if sect is not None:
# New section is found, check whether it is the one we are looking for
in_section = (str(sect).lower() == str(section).lower())
if option is not None and in_section:
# Great, this is an option from the section we are loking for
if replacevars and option in replacevars:
# replace value completely
new_line = u"%s=%s\n" % (option, replacevars[option])
old_values[option] = value
if appendvars and option in appendvars:
# append a new value unless it is already existing in the original one
if not value:
new_line = u"%s=%s\n" % (option, appendvars[option])
elif value.find(appendvars[option]) == -1:
new_line = u"%s=%s %s\n" % (option, value, appendvars[option])
old_values[option] = value
new_config.write(new_line)
# We have finished parsing the original file.
# There are two remaining cases:
# 1. Section we were looking for was not found, we need to add it.
if not (in_section or finished):
new_config.write("[%s]\n" % (section))
# 2. The section is the last one but some options were not found, add them.
if in_section or not finished:
add_options(new_config, replacevars, appendvars, old_values)
new_config.flush()
# Make sure the resulting file is readable by others before installing it
os.fchmod(new_config.fileno(), orig_stat.st_mode)
os.fchown(new_config.fileno(), orig_stat.st_uid, orig_stat.st_gid)
# At this point new_config is closed but not removed due to 'delete=False' above
# Now, install the temporary file as configuration and ensure old version is available as .orig
# While .orig file is not used during uninstall, it is left there for administrator.
install_file(temp_filename, filepath)
return old_values
def backup_config_and_replace_variables(
fstore, filepath, replacevars=dict(), appendvars=dict()):
"""
Take a key=value based configuration file, back up it, 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.
The file must exist before this function is called.
It is responsibility of a caller to ensure that replacevars and
appendvars do not overlap.
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
"""
# Backup original filepath
fstore.backup_file(filepath)
old_values = config_replace_variables(filepath, replacevars, appendvars)
return old_values
def wait_for_open_ports(host, ports, timeout=0):
"""
Wait until the specified port(s) on the remote host are open. Timeout
in seconds may be specified to limit the wait. If the timeout is
exceeded, socket.timeout exception is raised.
"""
timeout = float(timeout)
if not isinstance(ports, (tuple, list)):
ports = [ports]
logger.debug('wait_for_open_ports: %s %s timeout %d', host, ports, timeout)
op_timeout = time.time() + timeout
for port in ports:
logger.debug('waiting for port: %s', port)
log_error = True
while True:
port_open = host_port_open(host, port, log_errors=log_error)
log_error = False # Log only first err so that the log is readable
if port_open:
logger.debug('SUCCESS: port: %s', port)
break
if timeout and time.time() > op_timeout: # timeout exceeded
raise socket.timeout("Timeout exceeded")
time.sleep(1)
def wait_for_open_socket(socket_name, timeout=0):
"""
Wait until the specified socket on the local host is open. Timeout
in seconds may be specified to limit the wait.
"""
timeout = float(timeout)
op_timeout = time.time() + timeout
while True:
try:
s = socket.socket(socket.AF_UNIX)
s.connect(socket_name)
s.close()
break
except socket.error as e:
if e.errno in (2,111): # 111: Connection refused, 2: File not found
if timeout and time.time() > op_timeout: # timeout exceeded
raise e
time.sleep(1)
else:
raise e
def dn_attribute_property(private_name):
'''
Create a property for a dn attribute which assures the attribute
is a DN or None. If the value is not None the setter converts it to
a DN. The getter assures it's either None or a DN instance.
The private_name parameter is the class internal attribute the property
shadows.
For example if a class has an attribute called base_dn, then:
base_dn = dn_attribute_property('_base_dn')
Thus the class with have an attriubte called base_dn which can only
ever be None or a DN instance. The actual value is stored in _base_dn.
'''
def setter(self, value):
if value is not None:
value = DN(value)
setattr(self, private_name, value)
def getter(self):
value = getattr(self, private_name)
if value is not None:
assert isinstance(value, DN)
return value
return property(getter, setter)
def posixify(string):
"""
Convert a string to a more strict alpha-numeric representation.
- Alpha-numeric, underscore, dot and dash characters are accepted
- Space is converted to underscore
- Other characters are omitted
- Leading dash is stripped
Note: This mapping is not one-to-one and may map different input to the
same result. When using posixify, make sure the you do not map two different
entities to one unintentionally.
"""
def valid_char(char):
return char.isalnum() or char in ('_', '.', '-')
# First replace space characters
replaced = string.replace(' ','_')
omitted = ''.join(filter(valid_char, replaced))
# Leading dash is not allowed
return omitted.lstrip('-')
@contextmanager
def private_ccache(path=None):
if path is None:
dir_path = tempfile.mkdtemp(prefix='krbcc')
path = os.path.join(dir_path, 'ccache')
else:
dir_path = None
original_value = os.environ.get('KRB5CCNAME', None)
os.environ['KRB5CCNAME'] = path
try:
yield path
finally:
if original_value is not None:
os.environ['KRB5CCNAME'] = original_value
else:
os.environ.pop('KRB5CCNAME', None)
if os.path.exists(path):
os.remove(path)
if dir_path is not None:
try:
os.rmdir(dir_path)
except OSError:
pass
if six.PY2:
def fsdecode(value):
"""
Decode argument using the file system encoding, as returned by
`sys.getfilesystemencoding()`.
"""
if isinstance(value, bytes):
return value.decode(sys.getfilesystemencoding())
elif isinstance(value, str):
return value
else:
raise TypeError("expect {0} or {1}, not {2}".format(
bytes.__name__,
str.__name__,
type(value).__name__))
else:
fsdecode = os.fsdecode #pylint: disable=no-member
def unescape_seq(seq, *args):
"""
unescape (remove '\\') all occurences of sequence in input strings.
:param seq: sequence to unescape
:param args: input string to process
:returns: tuple of strings with unescaped sequences
"""
unescape_re = re.compile(r'\\{}'.format(seq))
return tuple(re.sub(unescape_re, seq, a) for a in args)
def escape_seq(seq, *args):
"""
escape (prepend '\\') all occurences of sequence in input strings
:param seq: sequence to escape
:param args: input string to process
:returns: tuple of strings with escaped sequences
"""
return tuple(a.replace(seq, u'\\{}'.format(seq)) for a in args)
def decode_json(data):
"""Decode JSON bytes to string with proper encoding
Only for supporting Py 3.5
Py 3.6 supports bytes as parameter for json.load, we can drop this when
there is no need for python 3.5 anymore
Code from:
https://bugs.python.org/file43513/json_detect_encoding_3.patch
:param data: JSON bytes
:return: return JSON string
"""
def detect_encoding(b):
bstartswith = b.startswith
if bstartswith((codecs.BOM_UTF32_BE, codecs.BOM_UTF32_LE)):
return 'utf-32'
if bstartswith((codecs.BOM_UTF16_BE, codecs.BOM_UTF16_LE)):
return 'utf-16'
if bstartswith(codecs.BOM_UTF8):
return 'utf-8-sig'
if len(b) >= 4:
if not b[0]:
# 00 00 -- -- - utf-32-be
# 00 XX -- -- - utf-16-be
return 'utf-16-be' if b[1] else 'utf-32-be'
if not b[1]:
# XX 00 00 00 - utf-32-le
# XX 00 XX XX - utf-16-le
return 'utf-16-le' if b[2] or b[3] else 'utf-32-le'
elif len(b) == 2:
if not b[0]:
# 00 XX - utf-16-be
return 'utf-16-be'
if not b[1]:
# XX 00 - utf-16-le
return 'utf-16-le'
# default
return 'utf-8'
if isinstance(data, str):
return data
return data.decode(detect_encoding(data), 'surrogatepass')
class APIVersion(tuple):
"""API version parser and handler
The class is used to parse ipapython.version.API_VERSION and plugin
versions.
"""
__slots__ = ()
def __new__(cls, version):
major, dot, minor = version.partition(u'.')
major = int(major)
minor = int(minor) if dot else 0
return tuple.__new__(cls, (major, minor))
def __str__(self):
return '{}.{}'.format(*self)
def __repr__(self):
return "<APIVersion('{}.{}')>".format(*self)
def __getnewargs__(self):
return str(self)
@property
def major(self):
return self[0]
@property
def minor(self):
return self[1]
def remove_keytab(keytab_path):
"""
Remove Kerberos keytab and issue a warning if the procedure fails
:param keytab_path: path to the keytab file
"""
try:
logger.debug("Removing service keytab: %s", keytab_path)
os.remove(keytab_path)
except OSError as e:
if e.errno != errno.ENOENT:
logger.warning("Failed to remove Kerberos keytab '%s': %s",
keytab_path, e)
logger.warning("You may have to remove it manually")
def remove_ccache(ccache_path=None, run_as=None):
"""
remove Kerberos credential cache, essentially a wrapper around kdestroy.
:param ccache_path: path to the ccache file
:param run_as: run kdestroy as this user
"""
logger.debug("Removing service credentials cache")
kdestroy_cmd = [paths.KDESTROY]
if ccache_path is not None:
logger.debug("Ccache path: '%s'", ccache_path)
kdestroy_cmd.extend(['-c', ccache_path])
try:
run(kdestroy_cmd, runas=run_as, env={})
except CalledProcessError as e:
logger.warning(
"Failed to clear Kerberos credentials cache: %s", e)
def remove_file(filename):
"""Remove a file and log any exceptions raised.
"""
try:
os.unlink(filename)
except Exception as e:
# ignore missing file
if getattr(e, 'errno', None) != errno.ENOENT:
logger.error('Error removing %s: %s', filename, str(e))
def rmtree(path):
"""
Remove a directory structure and log any exceptions raised.
"""
try:
if os.path.exists(path):
shutil.rmtree(path)
except Exception as e:
logger.error('Error removing %s: %s', path, str(e))
Reference in New Issue View Git Blame Copy Permalink