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freeipa/ipalib/install/certmonger.py
Christian Heimes 24a5d4d06b Ensure that KDC cert has SAN DNS entry 
The dns parameter of request_and_wait_for_cert() must be a string of
hostnames.

* Enforce list/tuple type so that API misuse no longer passes silently.
* Add commonNameToSANDefaultImpl to KDCs_PKINIT_Certs profile
* Explicitly pass hostname for service certs

Fixes: https://pagure.io/freeipa/issue/8685
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>
2021-01-29 13:36:41 -05:00

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# Authors: Rob Crittenden <rcritten@redhat.com>
# David Kupka <dkupka@redhat.com>
#
# Copyright (C) 2010 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/>.
#
# Some certmonger functions, mostly around updating the request file.
# This is used so we can add tracking to the Apache and 389-ds
# server certificates created during the IPA server installation.
from __future__ import print_function, absolute_import
import logging
import os
import time
import dbus
import shlex
import subprocess
import tempfile
from ipalib import api
from ipalib.constants import CA_DBUS_TIMEOUT
from ipapython.dn import DN
from ipapython.ipautil import Sleeper
from ipaplatform.paths import paths
from ipaplatform import services
logger = logging.getLogger(__name__)
DBUS_CM_PATH = '/org/fedorahosted/certmonger'
DBUS_CM_IF = 'org.fedorahosted.certmonger'
DBUS_CM_NAME = 'org.fedorahosted.certmonger'
DBUS_CM_REQUEST_IF = 'org.fedorahosted.certmonger.request'
DBUS_CM_CA_IF = 'org.fedorahosted.certmonger.ca'
DBUS_PROPERTY_IF = 'org.freedesktop.DBus.Properties'
# These properties, if encountered in search criteria, result in a
# subset test instead of equality test.
ARRAY_PROPERTIES = ['template-hostname']
"""
Certmonger helper routines.
Search criteria
---------------
Functions that look up requests take a ``dict`` of search criteria.
In general, the key is a name of a property in the request property
interface. But there are some special cases with different
behaviour:
``nickname``
a.k.a. "request ID". If given, only the specified request is
retrieved (if it exists), and it is still tested against other
criteria.
``ca-name``
Test equality against the nickname of the CA (a.k.a. request
helper) object for the request.
``template-hostname``
Must be an iterable of DNS names. Tests that the given values
are a subset of the values defined on the Certmonger request.
"""
class _cm_dbus_object:
"""
Auxiliary class for convenient DBus object handling.
"""
def __init__(self, bus, parent, object_path, object_dbus_interface,
parent_dbus_interface=None, property_interface=False):
"""
bus - DBus bus object, result of dbus.SystemBus() or dbus.SessionBus()
Object is accesible over this DBus bus instance.
object_path - path to requested object on DBus bus
object_dbus_interface
parent_dbus_interface
property_interface - create DBus property interface? True or False
"""
if bus is None or object_path is None or object_dbus_interface is None:
raise RuntimeError(
"bus, object_path and dbus_interface must not be None.")
if parent_dbus_interface is None:
parent_dbus_interface = object_dbus_interface
self.bus = bus
self.parent = parent
self.path = object_path
self.obj_dbus_if = object_dbus_interface
self.parent_dbus_if = parent_dbus_interface
self.obj = bus.get_object(parent_dbus_interface, object_path)
self.obj_if = dbus.Interface(self.obj, object_dbus_interface)
if property_interface:
self.prop_if = dbus.Interface(self.obj, DBUS_PROPERTY_IF)
class _certmonger(_cm_dbus_object):
"""
Create a connection to certmonger.
By default use SystemBus. When not available use private connection
over Unix socket.
This solution is really ugly and should be removed as soon as DBus
SystemBus is available at system install time.
"""
timeout = 300
def _start_private_conn(self):
sock_filename = os.path.join(tempfile.mkdtemp(), 'certmonger')
self._proc = subprocess.Popen([paths.CERTMONGER, '-n', '-L', '-P',
sock_filename])
for _t in range(0, self.timeout, 5):
if os.path.exists(sock_filename):
return "unix:path=%s" % sock_filename
time.sleep(5)
self._stop_private_conn()
raise RuntimeError("Failed to start certmonger: Timed out")
def _stop_private_conn(self):
if self._proc:
retcode = self._proc.poll()
if retcode is not None:
return
self._proc.terminate()
for _t in range(0, self.timeout, 5):
retcode = self._proc.poll()
if retcode is not None:
return
time.sleep(5)
logger.error("Failed to stop certmonger.")
def __del__(self):
self._stop_private_conn()
def __init__(self):
self._proc = None
self._bus = None
try:
self._bus = dbus.SystemBus()
except dbus.DBusException as e:
err_name = e.get_dbus_name()
if err_name not in ['org.freedesktop.DBus.Error.NoServer',
'org.freedesktop.DBus.Error.FileNotFound']:
logger.error("Failed to connect to certmonger over "
"SystemBus: %s", e)
raise
try:
self._private_sock = self._start_private_conn()
self._bus = dbus.connection.Connection(self._private_sock)
except dbus.DBusException as e:
logger.error("Failed to connect to certmonger over "
"private socket: %s", e)
raise
else:
try:
self._bus.get_name_owner(DBUS_CM_NAME)
except dbus.DBusException:
try:
services.knownservices.certmonger.start()
except Exception as e:
logger.error("Failed to start certmonger: %s", e)
raise
for _t in range(0, self.timeout, 5):
try:
self._bus.get_name_owner(DBUS_CM_NAME)
break
except dbus.DBusException:
pass
time.sleep(5)
raise RuntimeError('Failed to start certmonger')
super(_certmonger, self).__init__(self._bus, None, DBUS_CM_PATH,
DBUS_CM_IF)
def _get_requests(criteria):
"""
Get all requests that matches the provided criteria.
:param criteria: dict of criteria; see module doc for details
"""
if not isinstance(criteria, dict):
raise TypeError('"criteria" must be dict.')
cm = _certmonger()
requests = []
requests_paths = []
if 'nickname' in criteria:
request_path = cm.obj_if.find_request_by_nickname(criteria['nickname'])
if request_path:
requests_paths = [request_path]
else:
requests_paths = cm.obj_if.get_requests()
for request_path in requests_paths:
request = _cm_dbus_object(cm.bus, cm, request_path, DBUS_CM_REQUEST_IF,
DBUS_CM_IF, True)
for criterion in criteria:
if criterion == 'ca-name':
ca_path = request.obj_if.get_ca()
if ca_path is None:
raise RuntimeError("certmonger CA '%s' is not defined" %
criteria.get('ca-name'))
ca = _cm_dbus_object(cm.bus, cm, ca_path, DBUS_CM_CA_IF,
DBUS_CM_IF)
if criteria[criterion] != ca.obj_if.get_nickname():
break
elif criterion in ARRAY_PROPERTIES:
# perform subset test
expect = set(criteria[criterion])
got = request.prop_if.Get(DBUS_CM_REQUEST_IF, criterion)
if not expect.issubset(got):
break
else:
value = request.prop_if.Get(DBUS_CM_REQUEST_IF, criterion)
if criteria[criterion] != value:
break
else:
requests.append(request)
return requests
def _get_request(criteria):
"""
Find request that matches criteria. Return ``None`` if no match.
Raise ``RuntimeError`` if there is more than one matching request.
:param criteria: dict of criteria; see module doc for details
"""
requests = _get_requests(criteria)
if len(requests) == 0:
return None
elif len(requests) == 1:
return requests[0]
else:
raise RuntimeError("Criteria expected to be met by 1 request, got %s."
% len(requests))
def get_request_value(request_id, directive):
"""
Get property of request.
"""
try:
request = _get_request(dict(nickname=request_id))
except RuntimeError as e:
logger.error('Failed to get request: %s', e)
raise
if request:
if directive == 'ca-name':
ca_path = request.obj_if.get_ca()
ca = _cm_dbus_object(request.bus, request, ca_path, DBUS_CM_CA_IF,
DBUS_CM_IF)
return ca.obj_if.get_nickname()
else:
return request.prop_if.Get(DBUS_CM_REQUEST_IF, directive)
else:
return None
def get_request_id(criteria):
"""
If you don't know the certmonger request_id then try to find it by looking
through all the requests.
Return ``None`` if no match. Raise ``RuntimeError`` if there is
more than one matching request.
:param criteria: dict of criteria; see module doc for details
"""
try:
request = _get_request(criteria)
except RuntimeError as e:
logger.error('Failed to get request: %s', e)
raise
if request:
return request.prop_if.Get(DBUS_CM_REQUEST_IF, 'nickname')
else:
return None
def get_requests_for_dir(dir):
"""
Return a list containing the request ids for a given NSS database
directory.
"""
reqid = []
criteria = {'cert-storage': 'NSSDB', 'key-storage': 'NSSDB',
'cert-database': dir, 'key-database': dir, }
requests = _get_requests(criteria)
for request in requests:
reqid.append(request.prop_if.Get(DBUS_CM_REQUEST_IF, 'nickname'))
return reqid
def add_request_value(request_id, directive, value):
"""
Add a new directive to a certmonger request file.
"""
try:
request = _get_request({'nickname': request_id})
except RuntimeError as e:
logger.error('Failed to get request: %s', e)
raise
if request:
request.obj_if.modify({directive: value})
def add_principal(request_id, principal):
"""
In order for a certmonger request to be renewable it needs a principal.
When an existing certificate is added via start-tracking it won't have
a principal.
"""
add_request_value(request_id, 'template-principal', [principal])
def add_subject(request_id, subject):
"""
In order for a certmonger request to be renwable it needs the subject
set in the request file.
When an existing certificate is added via start-tracking it won't have
a subject_template set.
"""
add_request_value(request_id, 'template-subject', subject)
def request_and_wait_for_cert(
certpath, subject, principal, nickname=None, passwd_fname=None,
dns=None, ca='IPA', profile=None,
pre_command=None, post_command=None, storage='NSSDB', perms=None,
resubmit_timeout=0, stop_tracking_on_error=False):
"""Request certificate, wait and possibly resubmit failing requests
Submit a cert request to certmonger and wait until the request has
finished.
With timeout, a failed request is resubmitted. During parallel replica
installation, a request sometimes fails with CA_REJECTED or
CA_UNREACHABLE. The error occurs when the master is either busy or some
information haven't been replicated yet. Even a stuck request can be
recovered, e.g. when permission and group information have been
replicated.
"""
req_id = request_cert(
certpath, subject, principal, nickname, passwd_fname, dns, ca,
profile, pre_command, post_command, storage, perms
)
# Don't wait longer than resubmit timeout if it is configured
certmonger_timeout = api.env.certmonger_wait_timeout
if resubmit_timeout and resubmit_timeout < certmonger_timeout:
certmonger_timeout = resubmit_timeout
deadline = time.time() + resubmit_timeout
while True: # until success, timeout, or error
try:
state = wait_for_request(req_id, certmonger_timeout)
except RuntimeError as e:
logger.debug("wait_for_request raised %s", e)
state = 'TIMEOUT'
ca_error = get_request_value(req_id, 'ca-error')
if state == 'MONITORING' and ca_error is None:
# we got a winner, exiting
logger.debug("Cert request %s was successful", req_id)
return req_id
logger.debug(
"Cert request %s failed: %s (%s)", req_id, state, ca_error
)
if state in {'CA_REJECTED', 'CA_UNREACHABLE'}:
# probably unrecoverable error
logger.debug("Giving up on cert request %s", req_id)
break
if not resubmit_timeout:
# no resubmit
break
if time.time() > deadline:
logger.debug("Request %s reached resubmit deadline", req_id)
break
if state == 'TIMEOUT':
logger.debug("%s not in final state, continue waiting", req_id)
time.sleep(10)
else:
# sleep and resubmit
logger.debug("Sleep and resubmit cert request %s", req_id)
time.sleep(10)
resubmit_request(req_id)
if stop_tracking_on_error:
stop_tracking(request_id=req_id)
raise RuntimeError(
"Certificate issuance failed ({}: {})".format(state, ca_error)
)
def request_cert(
certpath, subject, principal, nickname=None, passwd_fname=None,
dns=None, ca='IPA', profile=None,
pre_command=None, post_command=None, storage='NSSDB', perms=None):
"""
Execute certmonger to request a server certificate.
``dns``
A sequence of DNS names to appear in SAN request extension.
``perms``
A tuple of (cert, key) permissions in e.g., (0644,0660)
"""
if storage == 'FILE':
certfile, keyfile = certpath
# This is a workaround for certmonger having different Subject
# representation with NSS and OpenSSL
# https://pagure.io/certmonger/issue/62
subject = str(DN(*reversed(DN(subject))))
else:
certfile = certpath
keyfile = certpath
cm = _certmonger()
ca_path = cm.obj_if.find_ca_by_nickname(ca)
if not ca_path:
raise RuntimeError('{} CA not found'.format(ca))
request_parameters = dict(KEY_STORAGE=storage, CERT_STORAGE=storage,
CERT_LOCATION=certfile, KEY_LOCATION=keyfile,
SUBJECT=subject, CA=ca_path)
if nickname:
request_parameters["CERT_NICKNAME"] = nickname
request_parameters["KEY_NICKNAME"] = nickname
if principal:
request_parameters['PRINCIPAL'] = [principal]
if dns:
if not isinstance(dns, (list, tuple)):
raise TypeError(dns)
request_parameters['DNS'] = dns
if passwd_fname:
request_parameters['KEY_PIN_FILE'] = passwd_fname
if profile:
request_parameters['ca-profile'] = profile
certmonger_cmd_template = paths.CERTMONGER_COMMAND_TEMPLATE
if pre_command:
if not os.path.isabs(pre_command):
pre_command = certmonger_cmd_template % (pre_command)
request_parameters['cert-presave-command'] = pre_command
if post_command:
if not os.path.isabs(post_command):
post_command = certmonger_cmd_template % (post_command)
request_parameters['cert-postsave-command'] = post_command
if perms:
request_parameters['cert-perms'] = perms[0]
request_parameters['key-perms'] = perms[1]
result = cm.obj_if.add_request(request_parameters)
try:
if result[0]:
request = _cm_dbus_object(cm.bus, cm, result[1], DBUS_CM_REQUEST_IF,
DBUS_CM_IF, True)
else:
raise RuntimeError('add_request() returned False')
except Exception as e:
logger.error('Failed to create a new request: %s', e)
raise
return request.obj_if.get_nickname()
def start_tracking(
certpath, ca='IPA', nickname=None, pin=None, pinfile=None,
pre_command=None, post_command=None, profile=None, storage="NSSDB",
token_name=None, dns=None):
"""
Tell certmonger to track the given certificate in either a file or an NSS
database. The certificate access can be protected by a password_file.
This uses the generic certmonger command getcert so we can specify
a different helper.
:param certpath:
The path to an NSS database or a tuple (PEM certificate, private key).
:param ca:
Nickanme of the CA for which the given certificate should be tracked.
:param nickname:
Nickname of the NSS certificate in ``certpath`` to be tracked.
:param pin:
The passphrase for either NSS database containing ``nickname`` or
for the encrypted key in the ``certpath`` tuple.
:param pinfile:
Similar to ``pin`` parameter except this is a path to a file containing
the required passphrase.
:param pre_command:
Specifies a command for certmonger to run before it renews a
certificate. This command must reside in /usr/lib/ipa/certmonger
to work with SELinux.
:param post_command:
Specifies a command for certmonger to run after it has renewed a
certificate. This command must reside in /usr/lib/ipa/certmonger
to work with SELinux.
:param storage:
One of "NSSDB" or "FILE", describes whether certmonger should use
NSS or OpenSSL backend to track the certificate in ``certpath``
:param profile:
Which certificate profile should be used.
:param token_name:
Hardware token name for HSM support
:param dns:
List of DNS names
:returns: certificate tracking nickname.
"""
if storage == 'FILE':
certfile, keyfile = certpath
else:
certfile = certpath
keyfile = certpath
cm = _certmonger()
certmonger_cmd_template = paths.CERTMONGER_COMMAND_TEMPLATE
ca_path = cm.obj_if.find_ca_by_nickname(ca)
if not ca_path:
raise RuntimeError('{} CA not found'.format(ca))
params = {
'TRACK': True,
'CERT_STORAGE': storage,
'KEY_STORAGE': storage,
'CERT_LOCATION': certfile,
'KEY_LOCATION': keyfile,
'CA': ca_path
}
if nickname:
params['CERT_NICKNAME'] = nickname
params['KEY_NICKNAME'] = nickname
if pin:
params['KEY_PIN'] = pin
if pinfile:
params['KEY_PIN_FILE'] = os.path.abspath(pinfile)
if pre_command:
if not os.path.isabs(pre_command):
pre_command = certmonger_cmd_template % (pre_command)
params['cert-presave-command'] = pre_command
if post_command:
if not os.path.isabs(post_command):
post_command = certmonger_cmd_template % (post_command)
params['cert-postsave-command'] = post_command
if profile:
params['ca-profile'] = profile
if token_name not in {None, "internal"}:
# only pass token names for external tokens (e.g. HSM)
params['key-token'] = token_name
params['cert-token'] = token_name
if dns is not None and len(dns) > 0:
params['DNS'] = dns
result = cm.obj_if.add_request(params)
try:
if result[0]:
request = _cm_dbus_object(cm.bus, cm, result[1], DBUS_CM_REQUEST_IF,
DBUS_CM_IF, True)
else:
raise RuntimeError('add_request() returned False')
except Exception as e:
logger.error('Failed to add new request: %s', e)
raise
return request.prop_if.Get(DBUS_CM_REQUEST_IF, 'nickname')
def stop_tracking(secdir=None, request_id=None, nickname=None, certfile=None):
"""
Stop tracking the current request using either the request_id or nickname.
Returns True or False
"""
if request_id is None and nickname is None and certfile is None:
raise RuntimeError('One of request_id, nickname and certfile is'
' required.')
if secdir is not None and certfile is not None:
raise RuntimeError("Can't specify both secdir and certfile.")
criteria = dict()
if secdir:
criteria['cert-database'] = secdir
if request_id:
criteria['nickname'] = request_id
if nickname:
criteria['cert-nickname'] = nickname
if certfile:
criteria['cert-file'] = certfile
try:
request = _get_request(criteria)
except RuntimeError as e:
logger.error('Failed to get request: %s', e)
raise
if request:
request.parent.obj_if.remove_request(request.path)
def modify(request_id, ca=None, profile=None, template_v2=None):
update = {}
if ca is not None:
cm = _certmonger()
update['CA'] = cm.obj_if.find_ca_by_nickname(ca)
if profile is not None:
update['template-profile'] = profile
if template_v2 is not None:
update['template-ms-certificate-template'] = template_v2
if len(update) > 0:
request = _get_request({'nickname': request_id})
request.obj_if.modify(update)
def resubmit_request(
request_id,
ca=None,
profile=None,
template_v2=None,
is_ca=False):
"""
:param request_id: the certmonger numeric request ID
:param ca: the nickname for the certmonger CA, e.g. IPA or SelfSign
:param profile: the profile to use, e.g. SubCA. For requests using the
Dogtag CA, this is the profile to use. This also causes
the Microsoft certificate tempalte name extension to the
CSR (for telling AD CS what template to use).
:param template_v2: Microsoft V2 template specifier extension value.
Format: <oid>:<major-version>[:<minor-version>]
:param is_ca: boolean that if True adds the CA basic constraint
"""
request = _get_request({'nickname': request_id})
if request:
update = {}
if ca is not None:
cm = _certmonger()
update['CA'] = cm.obj_if.find_ca_by_nickname(ca)
if profile is not None:
update['template-profile'] = profile
if template_v2 is not None:
update['template-ms-certificate-template'] = template_v2
if is_ca:
update['template-is-ca'] = True
update['template-ca-path-length'] = -1 # no path length
# TODO: certmonger assumes some hard-coded defaults like RSA 2048.
# Try to fetch values from current cert rather.
for key, convert in [('key-size', int), ('key-type', str)]:
try:
value = request.prop_if.Get(DBUS_CM_REQUEST_IF, key)
except dbus.DBusException:
continue
else:
if value:
# convert dbus.Int64() to int, dbus.String() to str
update[key] = convert(value)
if len(update) > 0:
request.obj_if.modify(update)
request.obj_if.resubmit()
def _find_IPA_ca():
"""
Look through all the certmonger CA files to find the one that
has id=IPA
We can use find_request_value because the ca files have the
same file format.
"""
cm = _certmonger()
ca_path = cm.obj_if.find_ca_by_nickname('IPA')
return _cm_dbus_object(cm.bus, cm, ca_path, DBUS_CM_CA_IF, DBUS_CM_IF, True)
def add_principal_to_cas(principal):
"""
If the hostname we were passed to use in ipa-client-install doesn't
match the value of gethostname() then we need to append
-k host/HOSTNAME@REALM to the ca helper defined for
/usr/libexec/certmonger/ipa-submit.
We also need to restore this on uninstall.
"""
ca = _find_IPA_ca()
if ca:
ext_helper = ca.prop_if.Get(DBUS_CM_CA_IF, 'external-helper')
if ext_helper and '-k' not in shlex.split(ext_helper):
ext_helper = '%s -k %s' % (ext_helper.strip(), principal)
ca.prop_if.Set(DBUS_CM_CA_IF, 'external-helper', ext_helper)
def remove_principal_from_cas():
"""
Remove any -k principal options from the ipa_submit helper.
"""
ca = _find_IPA_ca()
if ca:
ext_helper = ca.prop_if.Get(DBUS_CM_CA_IF, 'external-helper')
if ext_helper and '-k' in shlex.split(ext_helper):
ext_helper = shlex.split(ext_helper)[0]
ca.prop_if.Set(DBUS_CM_CA_IF, 'external-helper', ext_helper)
def modify_ca_helper(ca_name, helper):
"""
Modify certmonger CA helper.
Applies the new helper and return the previous configuration.
"""
bus = dbus.SystemBus()
obj = bus.get_object('org.fedorahosted.certmonger',
'/org/fedorahosted/certmonger')
iface = dbus.Interface(obj, 'org.fedorahosted.certmonger')
path = iface.find_ca_by_nickname(ca_name)
if not path:
raise RuntimeError("{} is not configured".format(ca_name))
else:
ca_obj = bus.get_object('org.fedorahosted.certmonger', path)
ca_iface = dbus.Interface(ca_obj,
'org.freedesktop.DBus.Properties')
old_helper = ca_iface.Get('org.fedorahosted.certmonger.ca',
'external-helper')
ca_iface.Set('org.fedorahosted.certmonger.ca',
'external-helper', helper,
# Give dogtag extra time to generate cert
timeout=CA_DBUS_TIMEOUT)
return old_helper
def get_pin(token="internal"):
"""
Dogtag stores its NSS pin in a file formatted as token:PIN.
The caller is expected to handle any exceptions raised.
"""
with open(paths.PKI_TOMCAT_PASSWORD_CONF, 'r') as f:
for line in f:
(tok, pin) = line.split('=', 1)
if token == tok:
return pin.strip()
return None
def check_state(dirs):
"""
Given a set of directories and nicknames verify that we are no longer
tracking certificates.
dirs is a list of directories to test for. We will return a tuple
of nicknames for any tracked certificates found.
This can only check for NSS-based certificates.
"""
reqids = []
for dir in dirs:
reqids.extend(get_requests_for_dir(dir))
return reqids
def wait_for_request(request_id, timeout=120):
sleep = Sleeper(
sleep=0.5, # getcert.c:waitfor() uses 125ms
timeout=timeout,
raises=RuntimeError("request timed out")
)
last_state = None
while True:
state = str(get_request_value(request_id, 'status'))
if state != last_state:
logger.debug("certmonger request is in state %r", state)
if state in {'CA_REJECTED', 'CA_UNREACHABLE', 'CA_UNCONFIGURED',
'NEED_GUIDANCE', 'NEED_CA', 'MONITORING'}:
break
last_state = state
sleep()
return state
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