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freeipa/ipaserver/install/certs.py
Rob Crittenden 34f28f06db Add token support to installer certificate handling 
Pass along the user-provided password file, if any, to the
underlying NSS database. This will provide for per-token
passwords.

If a token is in a nickname then break it out and pass it to
certutil separately.

Fixes: https://pagure.io/freeipa/issue/9273

Signed-off-by: Rob Crittenden <rcritten@redhat.com>
Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>
2024-05-16 08:46:32 -04:00

832 lines
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Python
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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 configparser
import logging
import os
import stat
import sys
import tempfile
import shutil
import xml.dom.minidom
import grp
import pwd
import base64
import fcntl
import time
import datetime
import six
from ipalib.install import certmonger, sysrestore
from ipapython import dogtag
from ipapython import ipautil
from ipapython.certdb import EMPTY_TRUST_FLAGS, IPA_CA_TRUST_FLAGS
from ipapython.certdb import get_ca_nickname, find_cert_from_txt, NSSDatabase
from ipapython.dn import DN
from ipalib import x509, api
from ipalib.errors import CertificateOperationError
from ipalib.install import certstore
from ipalib.util import strip_csr_header
from ipalib.text import _
from ipaplatform.paths import paths
from ipaplatform.tasks import tasks
logger = logging.getLogger(__name__)
def get_cert_nickname(cert):
"""
Using the subject from cert come up with a nickname suitable
for NSS. The caller can decide whether to use just the RDN
or the whole subject.
Returns a tuple of (rdn, subject_dn) when rdn is the string
representation of the first RDN in the subject and subject_dn
is a DN object.
"""
dn = DN(cert.subject)
return (str(dn[0]), dn)
def install_pem_from_p12(p12_fname, p12_passwd, pem_fname):
pwd = ipautil.write_tmp_file(p12_passwd)
args = [paths.OPENSSL, "pkcs12", "-nokeys", "-clcerts",
"-in", p12_fname, "-out", pem_fname,
"-passin", "file:" + pwd.name]
# the PKCS12 MAC requires PKCS12KDF which is not an approved FIPS
# algorithm and cannot be supported by the FIPS provider.
# Do not require mac verification in FIPS mode
fips_enabled = tasks.is_fips_enabled()
if fips_enabled:
args.append('-nomacver')
ipautil.run(args)
def install_key_from_p12(
p12_fname, p12_passwd, pem_fname, out_passwd_fname=None):
pwd = ipautil.write_tmp_file(p12_passwd)
args = [
paths.OPENSSL, "pkcs12", "-nocerts",
"-in", p12_fname, "-out", pem_fname,
"-passin", "file:" + pwd.name]
if out_passwd_fname is not None:
args.extend(['-passout', 'file:{}'.format(out_passwd_fname)])
else:
args.append('-nodes')
# the PKCS12 MAC requires PKCS12KDF which is not an approved FIPS
# algorithm and cannot be supported by the FIPS provider.
# Do not require mac verification in FIPS mode
fips_enabled = tasks.is_fips_enabled()
if fips_enabled:
args.append('-nomacver')
ipautil.run(args, umask=0o077)
def pkcs12_to_certkeys(p12_fname, p12_passwd=None):
"""
Deserializes pkcs12 file to python objects
:param p12_fname: A PKCS#12 filename
:param p12_passwd: Optional password for the pkcs12_fname file
"""
args = [paths.OPENSSL, "pkcs12", "-in", p12_fname, "-nodes"]
if p12_passwd:
pwd = ipautil.write_tmp_file(p12_passwd)
args.extend(["-passin", "file:{fname}".format(fname=pwd.name)])
else:
args.extend(["-passin", "pass:"])
pems = ipautil.run(args).raw_output
certs = x509.load_certificate_list(pems)
priv_keys = x509.load_private_key_list(pems)
return (certs, priv_keys)
def is_ipa_issued_cert(api, cert):
"""
Return True if the certificate has been issued by IPA
Note that this method can only be executed if the api has been
initialized.
:param api: The pre-initialized IPA API
:param cert: The IPACertificate certificiate to test
"""
cacert_subject = certstore.get_ca_subject(
api.Backend.ldap2,
api.env.container_ca,
api.env.basedn)
return DN(cert.issuer) == cacert_subject
class CertDB:
"""An IPA-server-specific wrapper around NSS
This class knows IPA-specific details such as nssdir location, or the
CA cert name.
``subject_base``
Realm subject base DN. This argument is required when creating
server or object signing certs.
``ca_subject``
IPA CA subject DN. This argument is required when importing
CA certificates into the certificate database.
"""
# TODO: Remove all selfsign code
def __init__(self, realm, nssdir, fstore=None,
host_name=None, subject_base=None, ca_subject=None,
user=None, group=None, mode=None, create=False,
dbtype='auto', pwd_file=None):
self.nssdb = NSSDatabase(nssdir, dbtype=dbtype, pwd_file=pwd_file)
self.realm = realm
self.noise_fname = os.path.join(self.secdir, "noise.txt")
self.pk12_fname = os.path.join(self.secdir, "cacert.p12")
self.pin_fname = os.path.join(self.secdir + "pin.txt")
self.reqdir = None
self.certreq_fname = None
self.certder_fname = None
self.host_name = host_name
self.ca_subject = ca_subject
self.subject_base = subject_base
self.cacert_name = get_ca_nickname(self.realm)
self.user = user
self.group = group
self.mode = mode
self.uid = 0
self.gid = 0
if not create:
if os.path.isdir(self.secdir):
# We are going to set the owner of all of the cert
# files to the owner of the containing directory
# instead of that of the process. This works when
# this is called by root for a daemon that runs as
# a normal user
mode = os.stat(self.secdir)
self.uid = mode[stat.ST_UID]
self.gid = mode[stat.ST_GID]
else:
if user is not None:
pu = pwd.getpwnam(user)
self.uid = pu.pw_uid
self.gid = pu.pw_gid
if group is not None:
self.gid = grp.getgrnam(group).gr_gid
self.create_certdbs()
if fstore:
self.fstore = fstore
else:
self.fstore = sysrestore.FileStore(paths.SYSRESTORE)
ca_subject = ipautil.dn_attribute_property('_ca_subject')
subject_base = ipautil.dn_attribute_property('_subject_base')
# migration changes paths, just forward attribute lookup to nssdb
@property
def secdir(self):
return self.nssdb.secdir
@property
def dbtype(self):
return self.nssdb.dbtype
@property
def certdb_fname(self):
return self.nssdb.certdb
@property
def keydb_fname(self):
return self.nssdb.keydb
@property
def secmod_fname(self):
return self.nssdb.secmod
@property
def passwd_fname(self):
return self.nssdb.pwd_file
def exists(self):
"""
Checks whether all NSS database files + our pwd_file exist
"""
return self.nssdb.exists()
def __del__(self):
if self.reqdir is not None:
shutil.rmtree(self.reqdir, ignore_errors=True)
self.reqdir = None
self.nssdb.close()
def setup_cert_request(self):
"""
Create a temporary directory to store certificate requests and
certificates. This should be called before requesting certificates.
This is set outside of __init__ to avoid creating a temporary
directory every time we open a cert DB.
"""
if self.reqdir is not None:
return
self.reqdir = tempfile.mkdtemp('', 'ipa-', paths.VAR_LIB_IPA)
self.certreq_fname = self.reqdir + "/tmpcertreq"
self.certder_fname = self.reqdir + "/tmpcert.der"
def set_perms(self, fname, write=False):
perms = stat.S_IRUSR
if write:
perms |= stat.S_IWUSR
if hasattr(fname, 'fileno'):
os.fchown(fname.fileno(), self.uid, self.gid)
os.fchmod(fname.fileno(), perms)
else:
os.chown(fname, self.uid, self.gid)
os.chmod(fname, perms)
def run_certutil(self, args, stdin=None, **kwargs):
return self.nssdb.run_certutil(args, stdin, **kwargs)
def create_noise_file(self):
if os.path.isfile(self.noise_fname):
os.remove(self.noise_fname)
with open(self.noise_fname, "w") as f:
self.set_perms(f)
f.write(ipautil.ipa_generate_password())
def create_passwd_file(self, passwd=None):
ipautil.backup_file(self.passwd_fname)
with open(self.passwd_fname, "w") as f:
self.set_perms(f)
if passwd is not None:
f.write("%s\n" % passwd)
else:
f.write(ipautil.ipa_generate_password())
def create_certdbs(self):
self.nssdb.create_db(
user=self.user, group=self.group, mode=self.mode,
backup=True
)
self.set_perms(self.passwd_fname, write=True)
def restore(self):
self.nssdb.restore()
def list_certs(self):
"""
Return a tuple of tuples containing (nickname, trust)
"""
return self.nssdb.list_certs()
def has_nickname(self, nickname):
"""
Returns True if nickname exists in the certdb, False otherwise.
This could also be done directly with:
certutil -L -d -n <nickname> ...
"""
certs = self.list_certs()
for cert in certs:
if nickname == cert[0]:
return True
return False
def export_ca_cert(self, nickname, create_pkcs12=False):
"""create_pkcs12 tells us whether we should create a PKCS#12 file
of the CA or not. If we are running on a replica then we won't
have the private key to make a PKCS#12 file so we don't need to
do that step."""
cacert_fname = paths.IPA_CA_CRT
# export the CA cert for use with other apps
ipautil.backup_file(cacert_fname)
root_nicknames = self.find_root_cert(nickname)[:-1]
with open(cacert_fname, "w") as f:
os.fchmod(f.fileno(), 0o644)
for root in root_nicknames:
result = self.run_certutil(["-L", "-n", root, "-a"],
capture_output=True)
f.write(result.output)
if create_pkcs12:
ipautil.backup_file(self.pk12_fname)
self.nssdb.run_pk12util([
"-o", self.pk12_fname,
"-n", self.cacert_name,
"-k", self.passwd_fname,
"-w", self.passwd_fname,
])
self.set_perms(self.pk12_fname)
def load_cacert(self, cacert_fname, trust_flags):
"""
Load all the certificates from a given file. It is assumed that
this file creates CA certificates.
"""
with open(cacert_fname) as f:
certs = f.read()
st = 0
while True:
try:
(cert, st) = find_cert_from_txt(certs, st)
_rdn, subject_dn = get_cert_nickname(cert)
if subject_dn == self.ca_subject:
nick = get_ca_nickname(self.realm)
else:
nick = str(subject_dn)
self.nssdb.add_cert(cert, nick, trust_flags)
except RuntimeError:
break
def get_cert_from_db(self, nickname):
"""
Retrieve a certificate from the current NSS database for nickname.
"""
if ':' in nickname:
token = nickname.split(':', 1)[0]
else:
token = None
try:
args = ["-L", "-n", nickname, "-a"]
if token:
args.extend(['-h', token])
result = self.run_certutil(args, capture_output=True)
return x509.load_pem_x509_certificate(result.raw_output)
except ipautil.CalledProcessError:
return None
def track_server_cert(
self, nickname, principal,
password_file=None, command=None, profile=None):
"""
Tell certmonger to track the given certificate nickname.
"""
try:
request_id = certmonger.start_tracking(
self.secdir, nickname=nickname, pinfile=password_file,
post_command=command, profile=profile)
except RuntimeError as e:
logger.error("certmonger failed starting to track certificate: %s",
str(e))
return
cert = self.get_cert_from_db(nickname)
subject = str(DN(cert.subject))
certmonger.add_principal(request_id, principal)
certmonger.add_subject(request_id, subject)
def untrack_server_cert(self, nickname):
"""
Tell certmonger to stop tracking the given certificate nickname.
"""
try:
certmonger.stop_tracking(self.secdir, nickname=nickname)
except RuntimeError as e:
logger.error("certmonger failed to stop tracking certificate: %s",
str(e))
def create_server_cert(self, nickname, hostname, subject=None):
"""
If we are using a dogtag CA then other_certdb contains the RA agent key
that will issue our cert.
You can override the certificate Subject by specifying a subject.
Returns a certificate in DER format.
"""
if subject is None:
subject=DN(('CN', hostname), self.subject_base)
self.request_cert(subject, san_dnsnames=[hostname])
try:
self.issue_server_cert(self.certreq_fname, self.certder_fname)
self.import_cert(self.certder_fname, nickname)
with open(self.certder_fname, "rb") as f:
dercert = f.read()
return x509.load_der_x509_certificate(dercert)
finally:
for fname in (self.certreq_fname, self.certder_fname):
try:
os.unlink(fname)
except OSError:
pass
def request_cert(
self, subject, certtype="rsa", keysize="2048",
san_dnsnames=None):
assert isinstance(subject, DN)
self.create_noise_file()
self.setup_cert_request()
args = ["-R", "-s", str(subject),
"-o", self.certreq_fname,
"-k", certtype,
"-g", keysize,
"-z", self.noise_fname,
"-f", self.passwd_fname,
"-a"]
if san_dnsnames is not None and len(san_dnsnames) > 0:
args += ['-8', ','.join(san_dnsnames)]
result = self.run_certutil(args,
capture_output=True, capture_error=True)
os.remove(self.noise_fname)
return (result.output, result.error_output)
def issue_server_cert(self, certreq_fname, cert_fname):
self.setup_cert_request()
if self.host_name is None:
raise RuntimeError("CA Host is not set.")
with open(certreq_fname, "rb") as f:
csr = f.read()
# We just want the CSR bits, make sure there is no thing else
csr = strip_csr_header(csr).decode('utf8')
params = {'profileId': dogtag.DEFAULT_PROFILE,
'cert_request_type': 'pkcs10',
'requestor_name': 'IPA Installer',
'cert_request': csr,
'xmlOutput': 'true'}
# Send the request to the CA
result = dogtag.https_request(
self.host_name, 8443,
url="/ca/ee/ca/profileSubmitSSLClient",
cafile=api.env.tls_ca_cert,
client_certfile=paths.RA_AGENT_PEM,
client_keyfile=paths.RA_AGENT_KEY,
**params)
http_status, _http_headers, http_body = result
logger.debug("CA answer: %r", http_body)
if http_status != 200:
raise CertificateOperationError(
error=_('Unable to communicate with CMS (status %d)') % http_status)
# The result is an XML blob. Pull the certificate out of that
doc = xml.dom.minidom.parseString(http_body)
item_node = doc.getElementsByTagName("b64")
try:
try:
cert = item_node[0].childNodes[0].data
except IndexError:
raise RuntimeError("Certificate issuance failed")
finally:
doc.unlink()
# base64-decode the result for uniformity
cert = base64.b64decode(cert)
# Write the certificate to a file. It will be imported in a later
# step. This file will be read later to be imported.
with open(cert_fname, "wb") as f:
f.write(cert)
def add_cert(self, cert, nick, flags):
self.nssdb.add_cert(cert, nick, flags)
def import_cert(self, cert_fname, nickname):
"""
Load a certificate from a PEM file and add minimal trust.
"""
args = ["-A", "-n", nickname,
"-t", "u,u,u",
"-i", cert_fname,
"-f", self.passwd_fname]
self.run_certutil(args)
def delete_cert(self, nickname):
self.nssdb.delete_cert(nickname)
def create_pin_file(self):
"""
This is the format of Directory Server pin files.
"""
ipautil.backup_file(self.pin_fname)
with open(self.pin_fname, "w") as pinfile:
self.set_perms(pinfile)
pinfile.write("Internal (Software) Token:")
with open(self.passwd_fname) as pwdfile:
pinfile.write(pwdfile.read())
def find_root_cert(self, nickname):
"""
Given a nickname, return a list of the certificates that make up
the trust chain.
"""
root_nicknames = self.nssdb.get_trust_chain(nickname)
return root_nicknames
def trust_root_cert(self, root_nickname, trust_flags):
if root_nickname is None:
logger.debug("Unable to identify root certificate to trust. "
"Continuing but things are likely to fail.")
return
try:
self.nssdb.trust_root_cert(root_nickname, trust_flags)
except RuntimeError:
pass
def find_server_certs(self):
return self.nssdb.find_server_certs()
def import_pkcs12(self, pkcs12_fname, pkcs12_passwd=None):
return self.nssdb.import_pkcs12(pkcs12_fname,
pkcs12_passwd=pkcs12_passwd)
def export_pkcs12(self, pkcs12_fname, pkcs12_pwd_fname, nickname=None):
if nickname is None:
nickname = get_ca_nickname(api.env.realm)
self.nssdb.run_pk12util([
"-o", pkcs12_fname,
"-n", nickname,
"-k", self.passwd_fname,
"-w", pkcs12_pwd_fname
])
def create_from_cacert(self):
"""
Ensure that a CA chain is in the NSS database.
If an NSS database already exists ensure that the CA chain
we want to load is in there and if not add it. If there is no
database then create an NSS database and load the CA chain.
"""
cacert_fname = paths.IPA_CA_CRT
if self.nssdb.exists():
# We already have a cert db, see if it is for the same CA.
# If it is we leave things as they are.
with open(cacert_fname, "r") as f:
newca = f.read()
newca, _st = find_cert_from_txt(newca)
cacert = self.get_cert_from_db(self.cacert_name)
if newca == cacert:
return
# The CA certificates are different or something went wrong. Start with
# a new certificate database.
self.create_passwd_file()
self.create_certdbs()
self.load_cacert(cacert_fname, IPA_CA_TRUST_FLAGS)
def create_from_pkcs12(self, pkcs12_fname, pkcs12_passwd,
ca_file, trust_flags):
"""Create a new NSS database using the certificates in a PKCS#12 file.
pkcs12_fname: the filename of the PKCS#12 file
pkcs12_pwd_fname: the file containing the pin for the PKCS#12 file
nickname: the nickname/friendly-name of the cert we are loading
The global CA may be added as well in case it wasn't included in the
PKCS#12 file. Extra certs won't hurt in any case.
The global CA may be specified in ca_file, as a PEM filename.
"""
self.create_noise_file()
self.create_passwd_file()
self.create_certdbs()
self.init_from_pkcs12(
pkcs12_fname,
pkcs12_passwd,
ca_file=ca_file,
trust_flags=trust_flags)
def init_from_pkcs12(self, pkcs12_fname, pkcs12_passwd,
ca_file, trust_flags):
self.import_pkcs12(pkcs12_fname, pkcs12_passwd)
server_certs = self.find_server_certs()
if len(server_certs) == 0:
raise RuntimeError("Could not find a suitable server cert in import in %s" % pkcs12_fname)
if ca_file:
try:
with open(ca_file) as fd:
certs = fd.read()
except IOError as e:
raise RuntimeError(
"Failed to open %s: %s" % (ca_file, e.strerror))
st = 0
num = 1
while True:
try:
cert, st = find_cert_from_txt(certs, st)
except RuntimeError:
break
self.add_cert(cert, 'CA %s' % num, EMPTY_TRUST_FLAGS)
num += 1
# We only handle one server cert
nickname = server_certs[0][0]
ca_names = self.find_root_cert(nickname)[:-1]
if len(ca_names) == 0:
raise RuntimeError("Could not find a CA cert in %s" % pkcs12_fname)
self.cacert_name = ca_names[-1]
self.trust_root_cert(self.cacert_name, trust_flags)
self.export_ca_cert(nickname, False)
def export_pem_cert(self, nickname, location):
return self.nssdb.export_pem_cert(nickname, location)
def request_service_cert(self, nickname, principal, host,
resubmit_timeout=None):
if resubmit_timeout is None:
resubmit_timeout = api.env.certmonger_wait_timeout
return certmonger.request_and_wait_for_cert(
certpath=self.secdir,
storage='NSSDB',
nickname=nickname,
principal=principal,
subject=host,
dns=[host],
passwd_fname=self.passwd_fname,
resubmit_timeout=resubmit_timeout
)
def is_ipa_issued_cert(self, api, nickname):
"""
Return True if the certificate contained in the CertDB with the
provided nickname has been issued by IPA.
Note that this method can only be executed if the api has been
initialized.
This method needs to compare the cert issuer (from the NSS DB
and the subject from the CA (from LDAP), because nicknames are not
always aligned.
The cert can be issued directly by IPA. In this case, the cert
issuer is IPA CA subject.
"""
cert = self.get_cert_from_db(nickname)
if cert is None:
raise RuntimeError("Could not find the cert %s in %s"
% (nickname, self.secdir))
return is_ipa_issued_cert(api, cert)
def needs_upgrade_format(self):
"""Check if NSSDB file format needs upgrade
Only upgrade if it's an existing dbm database and default
database type is no 'dbm'.
"""
return (
self.nssdb.dbtype == 'dbm' and
self.exists()
)
def upgrade_format(self):
"""Upgrade NSSDB to new file format
"""
self.nssdb.convert_db()
class _CrossProcessLock:
_DATETIME_FORMAT = '%Y%m%d%H%M%S%f'
def __init__(self, filename):
self._filename = filename
def __enter__(self):
self.acquire()
def __exit__(self, exc_type, exc_value, traceback):
self.release()
def acquire(self, owner=None):
self._do(self._acquire, owner)
def release(self, owner=None):
self._do(self._release, owner)
def _acquire(self, owner):
now = datetime.datetime.now(tz=datetime.timezone.utc)
if self._locked and now >= self._expire:
self._locked = False
if self._locked:
return False
self._locked = True
self._owner = owner
self._expire = now + datetime.timedelta(hours=1)
return True
def _release(self, owner):
if not self._locked or self._owner != owner:
raise RuntimeError("lock not acquired by %s" % owner)
self._locked = False
self._owner = None
self._expire = None
return True
def _do(self, func, owner):
if owner is None:
owner = '%s[%s]' % (os.path.basename(sys.argv[0]), os.getpid())
while True:
with open(self._filename, 'a+') as f:
fcntl.flock(f, fcntl.LOCK_EX)
f.seek(0)
self._read(f)
if func(owner):
f.seek(0)
f.truncate()
self._write(f)
return
time.sleep(10)
def _read(self, fileobj):
p = configparser.RawConfigParser()
if six.PY2:
p.readfp(fileobj) # pylint: disable=no-member
else:
p.read_file(fileobj)
try:
self._locked = p.getboolean('lock', 'locked')
if self._locked:
self._owner = p.get('lock', 'owner')
expire = p.get('lock', 'expire')
try:
self._expire = datetime.datetime.strptime(
expire, self._DATETIME_FORMAT).replace(
tzinfo=datetime.timezone.utc)
except ValueError:
raise configparser.Error
except configparser.Error:
self._locked = False
self._owner = None
self._expire = None
def _write(self, fileobj):
p = configparser.RawConfigParser()
p.add_section('lock')
locked = '1' if self._locked else '0'
p.set('lock', 'locked', locked)
if self._locked:
expire = self._expire.strftime(self._DATETIME_FORMAT)
p.set('lock', 'owner', self._owner)
p.set('lock', 'expire', expire)
p.write(fileobj)
renewal_lock = _CrossProcessLock(paths.IPA_RENEWAL_LOCK)
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