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freeipa/ipaserver/install/service.py
David Kupka 6f1d927467 password policy: Add explicit default password policy for hosts and services 
Set explicitly krbPwdPolicyReference attribute to all hosts (entries in
cn=computers,cn=accounts), services (entries in cn=services,cn=accounts) and
Kerberos services (entries in cn=$REALM,cn=kerberos). This is done using DS's
CoS so no attributes are really added.

The default policies effectively disable any enforcement or lockout for hosts
and services. Since hosts and services use keytabs passwords enforcements
doesn't make much sense. Also the lockout policy could be used for easy and
cheap DoS.

https://fedorahosted.org/freeipa/ticket/6561

Reviewed-By: Pavel Vomacka <pvomacka@redhat.com>
2016-12-14 17:46:12 +01:00

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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/>.
#
import sys
import os
import pwd
import socket
import datetime
import traceback
import tempfile
import six
from ipalib.install import certstore, sysrestore
from ipapython import ipautil
from ipapython.dn import DN
from ipapython.ipa_log_manager import root_logger
from ipapython import kerberos
from ipalib import api, errors
from ipaplatform import services
from ipaplatform.paths import paths
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),
'MEMCACHE': ('ipa_memcached', 39),
'HTTP': ('httpd', 40),
'KEYS': ('ipa-custodia', 41),
'NTP': ('ntpd', 45),
'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),
}
def print_msg(message, output_fd=sys.stdout):
root_logger.debug(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_server(svcname, conn, host_name=None, api=api):
"""
: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
Find a server that is a CA.
"""
dn = DN(('cn', 'masters'), ('cn', 'ipa'), ('cn', 'etc'), api.env.basedn)
query_filter = conn.make_filter({'objectClass': 'ipaConfigObject',
'ipaConfigString': 'enabledService',
'cn': svcname}, rules='&')
try:
entries, _trunc = conn.find_entries(filter=query_filter, base_dn=dn)
except errors.NotFound:
return None
if len(entries):
if host_name is not None:
for entry in entries:
if entry.dn[1].value == host_name:
return host_name
# if the preferred is not found, return the first in the list
return entries[0].dn[1].value
return None
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.dercert = None
self.api = api
self.service_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
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:
[pw_fd, pw_name] = tempfile.mkstemp()
os.write(pw_fd, dm_password)
os.close(pw_fd)
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:
root_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.
"""
dn = DN(('krbprincipalname', self.principal), ('cn', 'services'),
('cn', 'accounts'), self.suffix)
entry = api.Backend.ldap2.get_entry(dn)
entry.setdefault('userCertificate', []).append(self.dercert)
try:
api.Backend.ldap2.update_entry(entry)
except Exception as e:
root_logger.critical("Could not add certificate to service %s entry: %s" % (self.principal, str(e)))
def import_ca_certs(self, db, ca_is_configured, conn=None):
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=-1):
"""
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.
"""
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 > 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)
s = datetime.datetime.now()
method()
e = datetime.datetime.now()
d = e - s
root_logger.debug(" duration: %d seconds" % d.seconds)
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
root_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)
self.steps = []
def ldap_enable(self, name, fqdn, dm_password=None, ldap_suffix='',
config=[]):
assert isinstance(ldap_suffix, DN)
self.disable()
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:
if any(u'enabledservice' == val.lower()
for val in entry.get('ipaConfigString', [])):
root_logger.debug("service %s startup entry already enabled", name)
return
entry.setdefault('ipaConfigString', []).append(u'enabledService')
try:
api.Backend.ldap2.update_entry(entry)
except errors.EmptyModlist:
root_logger.debug("service %s startup entry already enabled", name)
return
except:
root_logger.debug("failed to enable service %s startup entry", name)
raise
root_logger.debug("service %s startup entry enabled", name)
return
order = SERVICE_LIST[name][1]
entry = api.Backend.ldap2.make_entry(
entry_name,
objectclass=["nsContainer", "ipaConfigObject"],
cn=[name],
ipaconfigstring=[
"enabledService", "startOrder " + str(order)] + config,
)
try:
api.Backend.ldap2.add_entry(entry)
except (errors.DuplicateEntry) as e:
root_logger.debug("failed to add service %s startup entry", name)
raise e
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': u'enabledService'}
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:
root_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() == u'enabledservice':
entry['ipaConfigString'].remove(value)
break
try:
api.Backend.ldap2.update_entry(entry)
except errors.EmptyModlist:
pass
except:
root_logger.debug("failed to disable service %s startup entry", name)
raise
root_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:
root_logger.debug("service %s container already removed", name)
else:
root_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 _run_getkeytab(self):
"""
backup and remove old service keytab (if present) and fetch a new one
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
"""
self.fstore.backup_file(self.keytab)
try:
os.unlink(self.keytab)
except OSError:
pass
ldap_uri = self.api.env.ldap_uri
args = [paths.IPA_GETKEYTAB,
'-k', self.keytab,
'-p', self.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,)
ipautil.run(args, nolog=nolog)
def _request_service_keytab(self):
if any(attr is None for attr in (self.principal, self.keytab,
self.service_user)):
raise NotImplementedError(
"service must have defined principal "
"name, keytab, and username")
self._add_service_principal()
self._run_getkeytab()
pent = pwd.getpwnam(self.service_user)
os.chown(self.keytab, pent.pw_uid, pent.pw_gid)
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_enable(self.gensvc_name, self.fqdn, None, self.suffix)
def uninstall(self):
if self.is_configured():
self.print_msg("Unconfiguring %s" % self.service_name)
self.stop()
self.disable()
running = self.restore_state("running")
enabled = self.restore_state("enabled")
# restore the original state of service
if running:
self.start()
if enabled:
self.enable()
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