/usr/lib/python2.7/dist-packages/ipaplatform/redhat/tasks.py is in python-ipalib 4.7.0~pre1+git20180411-2ubuntu2.
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# Alexander Bokovoy <abokovoy@redhat.com>
# Martin Kosek <mkosek@redhat.com>
# Tomas Babej <tbabej@redhat.com>
#
# Copyright (C) 2007-2014 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 <http://www.gnu.org/licenses/>.
'''
This module contains default Red Hat OS family-specific implementations of
system tasks.
'''
from __future__ import print_function
import ctypes
import logging
import os
import socket
import traceback
import errno
import sys
from ctypes.util import find_library
from functools import total_ordering
from subprocess import CalledProcessError
from pyasn1.error import PyAsn1Error
from six.moves import urllib
from ipapython import ipautil
import ipapython.errors
from ipaplatform.constants import constants
from ipaplatform.paths import paths
from ipaplatform.redhat.authconfig import RedHatAuthConfig
from ipaplatform.base.tasks import BaseTaskNamespace
logger = logging.getLogger(__name__)
def selinux_enabled():
"""
Check if SELinux is enabled.
"""
if os.path.exists(paths.SELINUXENABLED):
try:
ipautil.run([paths.SELINUXENABLED])
return True
except ipautil.CalledProcessError:
# selinuxenabled returns 1 if not enabled
return False
else:
# No selinuxenabled, no SELinux
return False
@total_ordering
class IPAVersion(object):
_rpmvercmp_func = None
@classmethod
def _rpmvercmp(cls, a, b):
"""Lazy load and call librpm's rpmvercmp
"""
rpmvercmp_func = cls._rpmvercmp_func
if rpmvercmp_func is None:
librpm = ctypes.CDLL(find_library('rpm'))
rpmvercmp_func = librpm.rpmvercmp
# int rpmvercmp(const char *a, const char *b)
rpmvercmp_func.argtypes = [ctypes.c_char_p, ctypes.c_char_p]
rpmvercmp_func.restype = ctypes.c_int
cls._rpmvercmp_func = rpmvercmp_func
return rpmvercmp_func(a, b)
def __init__(self, version):
self._version = version
self._bytes = version.encode('utf-8')
@property
def version(self):
return self._version
def __eq__(self, other):
if not isinstance(other, IPAVersion):
return NotImplemented
return self._rpmvercmp(self._bytes, other._bytes) == 0
def __lt__(self, other):
if not isinstance(other, IPAVersion):
return NotImplemented
return self._rpmvercmp(self._bytes, other._bytes) < 0
def __hash__(self):
return hash(self._version)
class RedHatTaskNamespace(BaseTaskNamespace):
def restore_context(self, filepath, force=False):
"""Restore SELinux security context on the given filepath.
SELinux equivalent is /path/to/restorecon <filepath>
restorecon's return values are not reliable so we have to
ignore them (BZ #739604).
ipautil.run() will do the logging.
"""
restorecon = paths.SBIN_RESTORECON
if not selinux_enabled() or not os.path.exists(restorecon):
return
# Force reset of context to match file_context for customizable
# files, and the default file context, changing the user, role,
# range portion as well as the type.
args = [restorecon]
if force:
args.append('-F')
args.append(filepath)
ipautil.run(args, raiseonerr=False)
def check_selinux_status(self, restorecon=paths.RESTORECON):
"""
We don't have a specific package requirement for policycoreutils
which provides restorecon. This is because we don't require
SELinux on client installs. However if SELinux is enabled then
this package is required.
This function returns nothing but may raise a Runtime exception
if SELinux is enabled but restorecon is not available.
"""
if not selinux_enabled():
return
if not os.path.exists(restorecon):
raise RuntimeError('SELinux is enabled but %s does not exist.\n'
'Install the policycoreutils package and start '
'the installation again.' % restorecon)
def check_ipv6_stack_enabled(self):
"""Checks whether IPv6 kernel module is loaded.
Function checks if /proc/net/if_inet6 is present. If IPv6 stack is
enabled, it exists and contains the interfaces configuration.
:raises: RuntimeError when IPv6 stack is disabled
"""
if not os.path.exists(paths.IF_INET6):
raise RuntimeError(
"IPv6 stack has to be enabled in the kernel and some "
"interface has to have ::1 address assigned. Typically "
"this is 'lo' interface. If you do not wish to use IPv6 "
"globally, disable it on the specific interfaces in "
"sysctl.conf except 'lo' interface.")
# XXX This is a hack to work around an issue with Travis CI by
# skipping IPv6 address test. The Dec 2017 update removed ::1 from
# loopback, see https://github.com/travis-ci/travis-ci/issues/8891.
if os.environ.get('TRAVIS') == 'true':
return
try:
localhost6 = ipautil.CheckedIPAddress('::1', allow_loopback=True)
if localhost6.get_matching_interface() is None:
raise ValueError("no interface for ::1 address found")
except ValueError:
raise RuntimeError(
"IPv6 stack is enabled in the kernel but there is no "
"interface that has ::1 address assigned. Add ::1 address "
"resolution to 'lo' interface. You might need to enable IPv6 "
"on the interface 'lo' in sysctl.conf.")
def restore_pre_ipa_client_configuration(self, fstore, statestore,
was_sssd_installed,
was_sssd_configured):
auth_config = RedHatAuthConfig()
if statestore.has_state('authconfig'):
# disable only those configurations that we enabled during install
for conf in ('ldap', 'krb5', 'sssd', 'sssdauth', 'mkhomedir'):
cnf = statestore.restore_state('authconfig', conf)
# Do not disable sssd, as this can cause issues with its later
# uses. Remove it from statestore however, so that it becomes
# empty at the end of uninstall process.
if cnf and conf != 'sssd':
auth_config.disable(conf)
else:
# There was no authconfig status store
# It means the code was upgraded after original install
# Fall back to old logic
auth_config.disable("ldap")
auth_config.disable("krb5")
if not(was_sssd_installed and was_sssd_configured):
# Only disable sssdauth. Disabling sssd would cause issues
# with its later uses.
auth_config.disable("sssdauth")
auth_config.disable("mkhomedir")
auth_config.execute()
def set_nisdomain(self, nisdomain):
# Let authconfig setup the permanent configuration
auth_config = RedHatAuthConfig()
auth_config.add_parameter("nisdomain", nisdomain)
auth_config.execute()
def modify_nsswitch_pam_stack(self, sssd, mkhomedir, statestore):
auth_config = RedHatAuthConfig()
if sssd:
statestore.backup_state('authconfig', 'sssd', True)
statestore.backup_state('authconfig', 'sssdauth', True)
auth_config.enable("sssd")
auth_config.enable("sssdauth")
else:
statestore.backup_state('authconfig', 'ldap', True)
auth_config.enable("ldap")
auth_config.enable("forcelegacy")
if mkhomedir:
statestore.backup_state('authconfig', 'mkhomedir', True)
auth_config.enable("mkhomedir")
auth_config.execute()
def modify_pam_to_use_krb5(self, statestore):
auth_config = RedHatAuthConfig()
statestore.backup_state('authconfig', 'krb5', True)
auth_config.enable("krb5")
auth_config.add_option("nostart")
auth_config.execute()
def backup_auth_configuration(self, path):
auth_config = RedHatAuthConfig()
auth_config.backup(path)
def restore_auth_configuration(self, path):
auth_config = RedHatAuthConfig()
auth_config.restore(path)
def reload_systemwide_ca_store(self):
try:
ipautil.run([paths.UPDATE_CA_TRUST])
except CalledProcessError as e:
logger.error(
"Could not update systemwide CA trust database: %s", e)
return False
else:
logger.info("Systemwide CA database updated.")
return True
def insert_ca_certs_into_systemwide_ca_store(self, ca_certs):
# pylint: disable=ipa-forbidden-import
from ipalib import x509 # FixMe: break import cycle
from ipalib.errors import CertificateError
# pylint: enable=ipa-forbidden-import
new_cacert_path = paths.SYSTEMWIDE_IPA_CA_CRT
if os.path.exists(new_cacert_path):
try:
os.remove(new_cacert_path)
except OSError as e:
logger.error(
"Could not remove %s: %s", new_cacert_path, e)
return False
new_cacert_path = paths.IPA_P11_KIT
try:
f = open(new_cacert_path, 'w')
except IOError as e:
logger.info("Failed to open %s: %s", new_cacert_path, e)
return False
f.write("# This file was created by IPA. Do not edit.\n"
"\n")
has_eku = set()
for cert, nickname, trusted, _ext_key_usage in ca_certs:
try:
subject = cert.subject_bytes
issuer = cert.issuer_bytes
serial_number = cert.serial_number_bytes
public_key_info = cert.public_key_info_bytes
except (PyAsn1Error, ValueError, CertificateError) as e:
logger.warning(
"Failed to decode certificate \"%s\": %s", nickname, e)
continue
label = urllib.parse.quote(nickname)
subject = urllib.parse.quote(subject)
issuer = urllib.parse.quote(issuer)
serial_number = urllib.parse.quote(serial_number)
public_key_info = urllib.parse.quote(public_key_info)
obj = ("[p11-kit-object-v1]\n"
"class: certificate\n"
"certificate-type: x-509\n"
"certificate-category: authority\n"
"label: \"%(label)s\"\n"
"subject: \"%(subject)s\"\n"
"issuer: \"%(issuer)s\"\n"
"serial-number: \"%(serial_number)s\"\n"
"x-public-key-info: \"%(public_key_info)s\"\n" %
dict(label=label,
subject=subject,
issuer=issuer,
serial_number=serial_number,
public_key_info=public_key_info))
if trusted is True:
obj += "trusted: true\n"
elif trusted is False:
obj += "x-distrusted: true\n"
obj += "{pem}\n\n".format(
pem=cert.public_bytes(x509.Encoding.PEM).decode('ascii'))
f.write(obj)
if (cert.extended_key_usage is not None and
public_key_info not in has_eku):
try:
ext_key_usage = cert.extended_key_usage_bytes
except PyAsn1Error as e:
logger.warning(
"Failed to encode extended key usage for \"%s\": %s",
nickname, e)
continue
value = urllib.parse.quote(ext_key_usage)
obj = ("[p11-kit-object-v1]\n"
"class: x-certificate-extension\n"
"label: \"ExtendedKeyUsage for %(label)s\"\n"
"x-public-key-info: \"%(public_key_info)s\"\n"
"object-id: 2.5.29.37\n"
"value: \"%(value)s\"\n\n" %
dict(label=label,
public_key_info=public_key_info,
value=value))
f.write(obj)
has_eku.add(public_key_info)
f.close()
# Add the CA to the systemwide CA trust database
if not self.reload_systemwide_ca_store():
return False
return True
def remove_ca_certs_from_systemwide_ca_store(self):
result = True
update = False
# Remove CA cert from systemwide store
for new_cacert_path in (paths.IPA_P11_KIT,
paths.SYSTEMWIDE_IPA_CA_CRT):
if not os.path.exists(new_cacert_path):
continue
try:
os.remove(new_cacert_path)
except OSError as e:
logger.error(
"Could not remove %s: %s", new_cacert_path, e)
result = False
else:
update = True
if update:
if not self.reload_systemwide_ca_store():
return False
return result
def backup_hostname(self, fstore, statestore):
filepath = paths.ETC_HOSTNAME
if os.path.exists(filepath):
fstore.backup_file(filepath)
# store old hostname
old_hostname = socket.gethostname()
statestore.backup_state('network', 'hostname', old_hostname)
def restore_hostname(self, fstore, statestore):
old_hostname = statestore.get_state('network', 'hostname')
if old_hostname is not None:
try:
self.set_hostname(old_hostname)
except ipautil.CalledProcessError as e:
logger.debug("%s", traceback.format_exc())
logger.error(
"Failed to restore this machine hostname to %s (%s).",
old_hostname, e
)
filepath = paths.ETC_HOSTNAME
if fstore.has_file(filepath):
fstore.restore_file(filepath)
def set_selinux_booleans(self, required_settings, backup_func=None):
def get_setsebool_args(changes):
args = [paths.SETSEBOOL, "-P"]
args.extend(["%s=%s" % update for update in changes.items()])
return args
if not selinux_enabled():
return False
updated_vars = {}
failed_vars = {}
for setting, state in required_settings.items():
if state is None:
continue
try:
result = ipautil.run(
[paths.GETSEBOOL, setting],
capture_output=True
)
original_state = result.output.split()[2]
if backup_func is not None:
backup_func(setting, original_state)
if original_state != state:
updated_vars[setting] = state
except ipautil.CalledProcessError as e:
logger.error("Cannot get SELinux boolean '%s': %s", setting, e)
failed_vars[setting] = state
if updated_vars:
args = get_setsebool_args(updated_vars)
try:
ipautil.run(args)
except ipautil.CalledProcessError:
failed_vars.update(updated_vars)
if failed_vars:
raise ipapython.errors.SetseboolError(
failed=failed_vars,
command=' '.join(get_setsebool_args(failed_vars)))
return True
def parse_ipa_version(self, version):
"""
:param version: textual version
:return: object implementing proper __cmp__ method for version compare
"""
return IPAVersion(version)
def configure_httpd_service_ipa_conf(self):
"""Create systemd config for httpd service to work with IPA
"""
if not os.path.exists(paths.SYSTEMD_SYSTEM_HTTPD_D_DIR):
os.mkdir(paths.SYSTEMD_SYSTEM_HTTPD_D_DIR, 0o755)
ipautil.copy_template_file(
os.path.join(paths.USR_SHARE_IPA_DIR, 'ipa-httpd.conf.template'),
paths.SYSTEMD_SYSTEM_HTTPD_IPA_CONF,
dict(
KDCPROXY_CONFIG=paths.KDCPROXY_CONFIG,
IPA_HTTPD_KDCPROXY=paths.IPA_HTTPD_KDCPROXY,
KRB5CC_HTTPD=paths.KRB5CC_HTTPD,
)
)
os.chmod(paths.SYSTEMD_SYSTEM_HTTPD_IPA_CONF, 0o644)
self.restore_context(paths.SYSTEMD_SYSTEM_HTTPD_IPA_CONF)
ipautil.run([paths.SYSTEMCTL, "--system", "daemon-reload"],
raiseonerr=False)
def configure_http_gssproxy_conf(self, ipaapi_user):
ipautil.copy_template_file(
os.path.join(paths.USR_SHARE_IPA_DIR, 'gssproxy.conf.template'),
paths.GSSPROXY_CONF,
dict(
HTTP_KEYTAB=paths.HTTP_KEYTAB,
HTTP_CCACHE=paths.HTTP_CCACHE,
HTTPD_USER=constants.HTTPD_USER,
IPAAPI_USER=ipaapi_user,
)
)
os.chmod(paths.GSSPROXY_CONF, 0o600)
self.restore_context(paths.GSSPROXY_CONF)
def configure_httpd_wsgi_conf(self):
"""Configure WSGI for correct Python version (Fedora)
See https://pagure.io/freeipa/issue/7394
"""
conf = paths.HTTPD_IPA_WSGI_MODULES_CONF
if sys.version_info.major == 2:
wsgi_module = constants.MOD_WSGI_PYTHON2
else:
wsgi_module = constants.MOD_WSGI_PYTHON3
if conf is None or wsgi_module is None:
logger.info("Nothing to do for configure_httpd_wsgi_conf")
return
confdir = os.path.dirname(conf)
if not os.path.isdir(confdir):
os.makedirs(confdir)
ipautil.copy_template_file(
os.path.join(
paths.USR_SHARE_IPA_DIR, 'ipa-httpd-wsgi.conf.template'
),
conf,
dict(WSGI_MODULE=wsgi_module)
)
os.chmod(conf, 0o644)
self.restore_context(conf)
def remove_httpd_service_ipa_conf(self):
"""Remove systemd config for httpd service of IPA"""
try:
os.unlink(paths.SYSTEMD_SYSTEM_HTTPD_IPA_CONF)
except OSError as e:
if e.errno == errno.ENOENT:
logger.debug(
'Trying to remove %s but file does not exist',
paths.SYSTEMD_SYSTEM_HTTPD_IPA_CONF
)
else:
logger.error(
'Error removing %s: %s',
paths.SYSTEMD_SYSTEM_HTTPD_IPA_CONF, e
)
return
ipautil.run([paths.SYSTEMCTL, "--system", "daemon-reload"],
raiseonerr=False)
def set_hostname(self, hostname):
ipautil.run([paths.BIN_HOSTNAMECTL, 'set-hostname', hostname])
def is_fips_enabled(self):
"""
Checks whether this host is FIPS-enabled.
Returns a boolean indicating if the host is FIPS-enabled, i.e. if the
file /proc/sys/crypto/fips_enabled contains a non-0 value. Otherwise,
or if the file /proc/sys/crypto/fips_enabled does not exist,
the function returns False.
"""
try:
with open(paths.PROC_FIPS_ENABLED, 'r') as f:
if f.read().strip() != '0':
return True
except IOError:
# Consider that the host is not fips-enabled if the file does not
# exist
pass
return False
tasks = RedHatTaskNamespace()
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