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freeipa/ipaserver/install/service.py
Armando Neto b4ad0d19a2 Fix pylint 2.0 return-related violations 
Aiming to support pylint 2.0 some functions and methods must have their
return statements updated in order to fix two new violations:

- `useless-return` (R1711):
  Useless return at end of function or method Emitted when a single
  "return" or "return None" statement is found at the end of function
  or method definition. This statement can safely be removed because
  Python will implicitly return None

- `inconsistent-return-statements` (R1710):
  Either all return statements in a function should return an
  expression, or none of them should. According to PEP8, if any return
  statement returns an expression, any return statements where no value
  is returned should explicitly state this as return None, and an
  explicit return statement should be present at the end of the
  function (if reachable)

Issue: https://pagure.io/freeipa/issue/7614

Signed-off-by: Armando Neto <abiagion@redhat.com>
Reviewed-By: Christian Heimes <cheimes@redhat.com>
2018-07-11 10:11:38 +02:00

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# Authors: Karl MacMillan <kmacmillan@mentalrootkit.com>
#
# Copyright (C) 2007 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/>.
#
from __future__ import absolute_import
import logging
import sys
import os
import pwd
import socket
import time
import traceback
import tempfile
import warnings
import six
from ipalib.install import certstore, sysrestore
from ipapython import ipautil
from ipapython.dn import DN
from ipapython import kerberos
from ipalib import api, errors, x509
from ipaplatform import services
from ipaplatform.paths import paths
logger = logging.getLogger(__name__)
if six.PY3:
unicode = str
# The service name as stored in cn=masters,cn=ipa,cn=etc. In the tuple
# the first value is the *nix service name, the second the start order.
SERVICE_LIST = {
'KDC': ('krb5kdc', 10),
'KPASSWD': ('kadmin', 20),
'DNS': ('named', 30),
'HTTP': ('httpd', 40),
'KEYS': ('ipa-custodia', 41),
'CA': ('pki-tomcatd', 50),
'KRA': ('pki-tomcatd', 51),
'ADTRUST': ('smb', 60),
'EXTID': ('winbind', 70),
'OTPD': ('ipa-otpd', 80),
'DNSKeyExporter': ('ipa-ods-exporter', 90),
'DNSSEC': ('ods-enforcerd', 100),
'DNSKeySync': ('ipa-dnskeysyncd', 110),
}
CONFIGURED_SERVICE = u'configuredService'
ENABLED_SERVICE = u'enabledService'
def print_msg(message, output_fd=sys.stdout):
logger.debug("%s", message)
output_fd.write(message)
output_fd.write("\n")
output_fd.flush()
def format_seconds(seconds):
"""Format a number of seconds as an English minutes+seconds message"""
parts = []
minutes, seconds = divmod(seconds, 60)
if minutes:
parts.append('%d minute' % minutes)
if minutes != 1:
parts[-1] += 's'
if seconds or not minutes:
parts.append('%d second' % seconds)
if seconds != 1:
parts[-1] += 's'
return ' '.join(parts)
def add_principals_to_group(admin_conn, group, member_attr, principals):
"""Add principals to a GroupOfNames LDAP group
admin_conn -- LDAP connection with admin rights
group -- DN of the group
member_attr -- attribute to represent members
principals -- list of DNs to add as members
"""
try:
current = admin_conn.get_entry(group)
members = current.get(member_attr, [])
if len(members) == 0:
current[member_attr] = []
for amember in principals:
if not(amember in members):
current[member_attr].extend([amember])
admin_conn.update_entry(current)
except errors.NotFound:
entry = admin_conn.make_entry(
group,
objectclass=["top", "GroupOfNames"],
cn=[group['cn']],
member=principals,
)
admin_conn.add_entry(entry)
except errors.EmptyModlist:
# If there are no changes just pass
pass
def find_providing_servers(svcname, conn, api):
"""
Find servers that provide the given service.
:param svcname: The service to find
:param conn: a connection to the LDAP server
:return: list of host names (possibly empty)
"""
dn = DN(('cn', 'masters'), ('cn', 'ipa'), ('cn', 'etc'), api.env.basedn)
query_filter = conn.make_filter({'objectClass': 'ipaConfigObject',
'ipaConfigString': ENABLED_SERVICE,
'cn': svcname}, rules='&')
try:
entries, _trunc = conn.find_entries(filter=query_filter, base_dn=dn)
except errors.NotFound:
return []
else:
return [entry.dn[1].value for entry in entries]
def find_providing_server(svcname, conn, host_name=None, api=api):
"""
Find a server that provides the given service.
:param svcname: The service to find
:param conn: a connection to the LDAP server
:param host_name: the preferred server
:return: the selected host name
"""
servers = find_providing_servers(svcname, conn, api)
if len(servers) == 0:
return None
if host_name in servers:
return host_name
return servers[0]
def case_insensitive_attr_has_value(attr, value):
"""
Helper function to find value in an attribute having case-insensitive
matching rules
:param attr: attribute values
:param value: value to find
:returns: True if the case-insensitive match succeeds, false otherwise
"""
if any(value.lower() == val.lower()
for val in attr):
return True
return False
def set_service_entry_config(name, fqdn, config_values,
ldap_suffix='',
post_add_config=()):
"""
Sets the 'ipaConfigString' values on the entry. If the entry is not present
already, create a new one with desired 'ipaConfigString'
:param name: service entry name
:param config_values: configuration values to store
:param fqdn: master fqdn
:param ldap_suffix: LDAP backend suffix
:param post_add_config: additional configuration to add when adding a
non-existent entry
"""
assert isinstance(ldap_suffix, DN)
entry_name = DN(
('cn', name), ('cn', fqdn), ('cn', 'masters'),
('cn', 'ipa'), ('cn', 'etc'), ldap_suffix)
# enable disabled service
try:
entry = api.Backend.ldap2.get_entry(
entry_name, ['ipaConfigString'])
except errors.NotFound:
pass
else:
existing_values = entry.get('ipaConfigString', [])
for value in config_values:
if case_insensitive_attr_has_value(existing_values, value):
logger.debug(
"service %s: config string %s already set", name, value)
entry.setdefault('ipaConfigString', []).append(value)
try:
api.Backend.ldap2.update_entry(entry)
except errors.EmptyModlist:
logger.debug(
"service %s has already enabled config values %s", name,
config_values)
return
except:
logger.debug("failed to set service %s config values", name)
raise
logger.debug("service %s has all config values set", name)
return
entry = api.Backend.ldap2.make_entry(
entry_name,
objectclass=["nsContainer", "ipaConfigObject"],
cn=[name],
ipaconfigstring=config_values + list(post_add_config),
)
try:
api.Backend.ldap2.add_entry(entry)
except (errors.DuplicateEntry) as e:
logger.debug("failed to add service entry %s", name)
raise e
def enable_services(fqdn):
"""Change all configured services to enabled
Server.ldap_configure() only marks a service as configured. Services
are enabled at the very end of installation.
Note: DNS records must be updated with dns_update_system_records, too.
:param fqdn: hostname of server
"""
ldap2 = api.Backend.ldap2
search_base = DN(('cn', fqdn), api.env.container_masters, api.env.basedn)
search_filter = ldap2.make_filter(
{
'objectClass': 'ipaConfigObject',
'ipaConfigString': CONFIGURED_SERVICE
},
rules='&'
)
entries = ldap2.get_entries(
search_base,
filter=search_filter,
scope=api.Backend.ldap2.SCOPE_ONELEVEL,
attrs_list=['cn', 'ipaConfigString']
)
for entry in entries:
name = entry['cn']
cfgstrings = entry.setdefault('ipaConfigString', [])
for value in list(cfgstrings):
if value.lower() == CONFIGURED_SERVICE.lower():
cfgstrings.remove(value)
if not case_insensitive_attr_has_value(cfgstrings, ENABLED_SERVICE):
cfgstrings.append(ENABLED_SERVICE)
try:
ldap2.update_entry(entry)
except errors.EmptyModlist:
logger.debug("Nothing to do for service %s", name)
except Exception:
logger.exception("failed to set service %s config values", name)
raise
else:
logger.debug("Enabled service %s for %s", name, fqdn)
class Service(object):
def __init__(self, service_name, service_desc=None, sstore=None,
fstore=None, api=api, realm_name=None,
service_user=None, service_prefix=None,
keytab=None):
self.service_name = service_name
self.service_desc = service_desc
self.service = services.service(service_name, api)
self.steps = []
self.output_fd = sys.stdout
self.fqdn = socket.gethostname()
if sstore:
self.sstore = sstore
else:
self.sstore = sysrestore.StateFile(paths.SYSRESTORE)
if fstore:
self.fstore = fstore
else:
self.fstore = sysrestore.FileStore(paths.SYSRESTORE)
self.realm = realm_name
self.suffix = DN()
self.service_prefix = service_prefix
self.keytab = keytab
self.cert = None
self.api = api
self.service_user = service_user
self.keytab_user = service_user
self.dm_password = None # silence pylint
self.promote = False
@property
def principal(self):
if any(attr is None for attr in (self.realm, self.fqdn,
self.service_prefix)):
return None
return unicode(
kerberos.Principal(
(self.service_prefix, self.fqdn), realm=self.realm))
def _ldap_mod(self, ldif, sub_dict=None, raise_on_err=True,
ldap_uri=None, dm_password=None):
pw_name = None
fd = None
path = os.path.join(paths.USR_SHARE_IPA_DIR, ldif)
nologlist = []
if sub_dict is not None:
txt = ipautil.template_file(path, sub_dict)
fd = ipautil.write_tmp_file(txt)
path = fd.name
# do not log passwords
if 'PASSWORD' in sub_dict:
nologlist.append(sub_dict['PASSWORD'])
if 'RANDOM_PASSWORD' in sub_dict:
nologlist.append(sub_dict['RANDOM_PASSWORD'])
args = [paths.LDAPMODIFY, "-v", "-f", path]
# As we always connect to the local host,
# use URI of admin connection
if not ldap_uri:
ldap_uri = api.Backend.ldap2.ldap_uri
args += ["-H", ldap_uri]
if dm_password:
with tempfile.NamedTemporaryFile(
mode='w', delete=False) as pw_file:
pw_file.write(dm_password)
pw_name = pw_file.name
auth_parms = ["-x", "-D", "cn=Directory Manager", "-y", pw_name]
# Use GSSAPI auth when not using DM password or not being root
elif os.getegid() != 0:
auth_parms = ["-Y", "GSSAPI"]
# Default to EXTERNAL auth mechanism
else:
auth_parms = ["-Y", "EXTERNAL"]
args += auth_parms
try:
try:
ipautil.run(args, nolog=nologlist)
except ipautil.CalledProcessError as e:
logger.critical("Failed to load %s: %s", ldif, str(e))
if raise_on_err:
raise
finally:
if pw_name:
os.remove(pw_name)
def move_service(self, principal):
"""
Used to move a principal entry created by kadmin.local from
cn=kerberos to cn=services
"""
dn = DN(('krbprincipalname', principal), ('cn', self.realm), ('cn', 'kerberos'), self.suffix)
try:
entry = api.Backend.ldap2.get_entry(dn)
except errors.NotFound:
# There is no service in the wrong location, nothing to do.
# This can happen when installing a replica
return None
entry.pop('krbpwdpolicyreference', None) # don't copy virtual attr
newdn = DN(('krbprincipalname', principal), ('cn', 'services'), ('cn', 'accounts'), self.suffix)
hostdn = DN(('fqdn', self.fqdn), ('cn', 'computers'), ('cn', 'accounts'), self.suffix)
api.Backend.ldap2.delete_entry(entry)
entry.dn = newdn
classes = entry.get("objectclass")
classes = classes + ["ipaobject", "ipaservice", "pkiuser"]
entry["objectclass"] = list(set(classes))
entry["ipauniqueid"] = ['autogenerate']
entry["managedby"] = [hostdn]
api.Backend.ldap2.add_entry(entry)
return newdn
def add_simple_service(self, principal):
"""
Add a very basic IPA service.
The principal needs to be fully-formed: service/host@REALM
"""
dn = DN(('krbprincipalname', principal), ('cn', 'services'), ('cn', 'accounts'), self.suffix)
hostdn = DN(('fqdn', self.fqdn), ('cn', 'computers'), ('cn', 'accounts'), self.suffix)
entry = api.Backend.ldap2.make_entry(
dn,
objectclass=[
"krbprincipal", "krbprincipalaux", "krbticketpolicyaux",
"ipaobject", "ipaservice", "pkiuser"],
krbprincipalname=[principal],
ipauniqueid=['autogenerate'],
managedby=[hostdn],
)
api.Backend.ldap2.add_entry(entry)
return dn
def add_cert_to_service(self):
"""
Add a certificate to a service
This server cert should be in DER format.
"""
if self.cert is None:
raise ValueError("{} has no cert".format(self.service_name))
dn = DN(('krbprincipalname', self.principal), ('cn', 'services'),
('cn', 'accounts'), self.suffix)
entry = api.Backend.ldap2.get_entry(dn)
entry.setdefault('userCertificate', []).append(self.cert)
try:
api.Backend.ldap2.update_entry(entry)
except Exception as e:
logger.critical("Could not add certificate to service %s entry: "
"%s", self.principal, str(e))
def export_ca_certs_file(self, cafile, ca_is_configured, conn=None):
"""
Export the CA certificates stored in LDAP into a file
:param cafile: the file to write the CA certificates to
:param ca_is_configured: whether IPA is CA-less or not
:param conn: an optional LDAP connection to use
"""
if conn is None:
conn = api.Backend.ldap2
ca_certs = None
try:
ca_certs = certstore.get_ca_certs(
conn, self.suffix, self.realm, ca_is_configured)
except errors.NotFound:
pass
else:
with open(cafile, 'wb') as fd:
for cert, _unused, _unused, _unused in ca_certs:
fd.write(cert.public_bytes(x509.Encoding.PEM))
def export_ca_certs_nssdb(self, db, ca_is_configured, conn=None):
"""
Export the CA certificates stored in LDAP into an NSS database
:param db: the target NSS database
:param ca_is_configured: whether IPA is CA-less or not
:param conn: an optional LDAP connection to use
"""
if conn is None:
conn = api.Backend.ldap2
try:
ca_certs = certstore.get_ca_certs_nss(
conn, self.suffix, self.realm, ca_is_configured)
except errors.NotFound:
pass
else:
for cert, nickname, trust_flags in ca_certs:
db.add_cert(cert, nickname, trust_flags)
def is_configured(self):
return self.sstore.has_state(self.service_name)
def set_output(self, fd):
self.output_fd = fd
def stop(self, instance_name="", capture_output=True):
self.service.stop(instance_name, capture_output=capture_output)
def start(self, instance_name="", capture_output=True, wait=True):
self.service.start(instance_name, capture_output=capture_output, wait=wait)
def restart(self, instance_name="", capture_output=True, wait=True):
self.service.restart(instance_name, capture_output=capture_output, wait=wait)
def is_running(self, instance_name="", wait=True):
return self.service.is_running(instance_name, wait)
def install(self):
self.service.install()
def remove(self):
self.service.remove()
def enable(self):
self.service.enable()
def disable(self):
self.service.disable()
def is_enabled(self):
return self.service.is_enabled()
def mask(self):
return self.service.mask()
def unmask(self):
return self.service.unmask()
def is_masked(self):
return self.service.is_masked()
def backup_state(self, key, value):
self.sstore.backup_state(self.service_name, key, value)
def restore_state(self, key):
return self.sstore.restore_state(self.service_name, key)
def get_state(self, key):
return self.sstore.get_state(self.service_name, key)
def print_msg(self, message):
print_msg(message, self.output_fd)
def step(self, message, method, run_after_failure=False):
self.steps.append((message, method, run_after_failure))
def start_creation(self, start_message=None, end_message=None,
show_service_name=True, runtime=None):
"""
Starts creation of the service.
Use start_message and end_message for explicit messages
at the beggining / end of the process. Otherwise they are generated
using the service description (or service name, if the description has
not been provided).
Use show_service_name to include service name in generated descriptions.
"""
creation_start = time.time()
if start_message is None:
# no other info than mandatory service_name provided, use that
if self.service_desc is None:
start_message = "Configuring %s" % self.service_name
# description should be more accurate than service name
else:
start_message = "Configuring %s" % self.service_desc
if show_service_name:
start_message = "%s (%s)" % (start_message, self.service_name)
if end_message is None:
if self.service_desc is None:
if show_service_name:
end_message = "Done configuring %s." % self.service_name
else:
end_message = "Done."
else:
if show_service_name:
end_message = "Done configuring %s (%s)." % (
self.service_desc, self.service_name)
else:
end_message = "Done configuring %s." % self.service_desc
if runtime is not None and runtime > 0:
self.print_msg('%s. Estimated time: %s' % (start_message,
format_seconds(runtime)))
else:
self.print_msg(start_message)
def run_step(message, method):
self.print_msg(message)
start = time.time()
method()
dur = time.time() - start
name = method.__name__
logger.debug(
"step duration: %s %s %.02f sec",
self.service_name, name, dur,
extra={'timing': ('step', self.service_name, name, dur)},
)
step = 0
steps_iter = iter(self.steps)
try:
for message, method, run_after_failure in steps_iter:
full_msg = " [%d/%d]: %s" % (step+1, len(self.steps), message)
run_step(full_msg, method)
step += 1
except BaseException as e:
if not (isinstance(e, SystemExit) and
e.code == 0): # pylint: disable=no-member
# show the traceback, so it's not lost if cleanup method fails
logger.debug("%s", traceback.format_exc())
self.print_msg(' [error] %s: %s' % (type(e).__name__, e))
# run through remaining methods marked run_after_failure
for message, method, run_after_failure in steps_iter:
if run_after_failure:
run_step(" [cleanup]: %s" % message, method)
raise
self.print_msg(end_message)
dur = time.time() - creation_start
logger.debug(
"service duration: %s %.02f sec",
self.service_name, dur,
extra={'timing': ('service', self.service_name, None, dur)},
)
self.steps = []
def ldap_enable(self, name, fqdn, dm_password=None, ldap_suffix='',
config=()):
"""Legacy function, all services should use ldap_configure()
"""
warnings.warn(
"ldap_enable is deprecated, use ldap_configure instead.",
DeprecationWarning,
stacklevel=2
)
self._ldap_enable(ENABLED_SERVICE, name, fqdn, ldap_suffix, config)
def ldap_configure(self, name, fqdn, dm_password=None, ldap_suffix='',
config=()):
"""Create or modify service entry in cn=masters,cn=ipa,cn=etc
Contrary to ldap_enable(), the method only sets
ipaConfigString=configuredService. ipaConfigString=enabledService
is set at the very end of the installation process, to ensure that
other machines see this master/replica after it is fully installed.
To switch all configured services to enabled, use::
ipaserver.install.service.enable_services(api.env.host)
api.Command.dns_update_system_records()
"""
self._ldap_enable(
CONFIGURED_SERVICE, name, fqdn, ldap_suffix, config
)
def _ldap_enable(self, value, name, fqdn, ldap_suffix, config):
extra_config_opts = [
' '.join([u'startOrder', unicode(SERVICE_LIST[name][1])])
]
extra_config_opts.extend(config)
self.disable()
set_service_entry_config(
name,
fqdn,
[value],
ldap_suffix=ldap_suffix,
post_add_config=extra_config_opts)
def ldap_disable(self, name, fqdn, ldap_suffix):
assert isinstance(ldap_suffix, DN)
entry_dn = DN(('cn', name), ('cn', fqdn), ('cn', 'masters'),
('cn', 'ipa'), ('cn', 'etc'), ldap_suffix)
search_kw = {'ipaConfigString': ENABLED_SERVICE}
filter = api.Backend.ldap2.make_filter(search_kw)
try:
entries, _truncated = api.Backend.ldap2.find_entries(
filter=filter,
attrs_list=['ipaConfigString'],
base_dn=entry_dn,
scope=api.Backend.ldap2.SCOPE_BASE)
except errors.NotFound:
logger.debug("service %s startup entry already disabled", name)
return
assert len(entries) == 1 # only one entry is expected
entry = entries[0]
# case insensitive
for value in entry.get('ipaConfigString', []):
if value.lower() == ENABLED_SERVICE:
entry['ipaConfigString'].remove(value)
break
try:
api.Backend.ldap2.update_entry(entry)
except errors.EmptyModlist:
pass
except:
logger.debug("failed to disable service %s startup entry", name)
raise
logger.debug("service %s startup entry disabled", name)
def ldap_remove_service_container(self, name, fqdn, ldap_suffix):
entry_dn = DN(('cn', name), ('cn', fqdn), ('cn', 'masters'),
('cn', 'ipa'), ('cn', 'etc'), ldap_suffix)
try:
api.Backend.ldap2.delete_entry(entry_dn)
except errors.NotFound:
logger.debug("service %s container already removed", name)
else:
logger.debug("service %s container sucessfully removed", name)
def _add_service_principal(self):
try:
self.api.Command.service_add(self.principal, force=True)
except errors.DuplicateEntry:
pass
def clean_previous_keytab(self, keytab=None):
if keytab is None:
keytab = self.keytab
self.fstore.backup_file(keytab)
try:
os.unlink(keytab)
except OSError:
pass
def set_keytab_owner(self, keytab=None, owner=None):
if keytab is None:
keytab = self.keytab
if owner is None:
owner = self.service_user
pent = pwd.getpwnam(owner)
os.chown(keytab, pent.pw_uid, pent.pw_gid)
def run_getkeytab(self, ldap_uri, keytab, principal, retrieve=False):
"""
retrieve service keytab using ipa-getkeytab. This assumes that the
service principal is already created in LDAP. By default GSSAPI
authentication is used unless:
* LDAPI socket is used and effective process UID is 0, then
autobind is used by EXTERNAL SASL mech
* self.dm_password is not none, then DM credentials are used to
fetch keytab
"""
args = [paths.IPA_GETKEYTAB,
'-k', keytab,
'-p', principal,
'-H', ldap_uri]
nolog = tuple()
if ldap_uri.startswith("ldapi://") and os.geteuid() == 0:
args.extend(["-Y", "EXTERNAL"])
elif self.dm_password is not None and not self.promote:
args.extend(
['-D', 'cn=Directory Manager',
'-w', self.dm_password])
nolog += (self.dm_password,)
if retrieve:
args.extend(['-r'])
ipautil.run(args, nolog=nolog)
def request_service_keytab(self):
if any(attr is None for attr in (self.principal, self.keytab)):
raise NotImplementedError(
"service must have defined principal "
"name and keytab")
self._add_service_principal()
self.clean_previous_keytab()
self.run_getkeytab(self.api.env.ldap_uri, self.keytab, self.principal)
self.set_keytab_owner()
class SimpleServiceInstance(Service):
def create_instance(self, gensvc_name=None, fqdn=None, ldap_suffix=None,
realm=None):
self.gensvc_name = gensvc_name
self.fqdn = fqdn
self.suffix = ldap_suffix
self.realm = realm
self.step("starting %s " % self.service_name, self.__start)
self.step("configuring %s to start on boot" % self.service_name, self.__enable)
self.start_creation("Configuring %s" % self.service_name)
suffix = ipautil.dn_attribute_property('_ldap_suffix')
def __start(self):
self.backup_state("running", self.is_running())
self.restart()
def __enable(self):
self.backup_state("enabled", self.is_enabled())
if self.gensvc_name == None:
self.enable()
else:
self.ldap_configure(self.gensvc_name, self.fqdn, None, self.suffix)
def is_installed(self):
return self.service.is_installed()
def uninstall(self):
if self.is_configured():
self.print_msg("Unconfiguring %s" % self.service_name)
running = self.restore_state("running")
enabled = self.restore_state("enabled")
if self.is_installed():
self.stop()
self.disable()
if running:
self.start()
if enabled:
self.enable()
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