freeipa/ipaserver/install/ca.py

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#
# Copyright (C) 2015 FreeIPA Contributors see COPYING for license
#
"""
CA installer module
"""
from __future__ import print_function, absolute_import
import enum
import logging
import os.path
import six
from ipalib.constants import IPA_CA_CN
from ipalib.install import certstore
from ipalib.install.service import enroll_only, master_install_only, replica_install_only
from ipaserver.install import sysupgrade
from ipapython.install import typing
from ipapython.install.core import group, knob, extend_knob
from ipaserver.install import cainstance, bindinstance, dsinstance
from ipapython import ipautil, certdb
from ipapython import ipaldap
from ipapython.admintool import ScriptError
from ipaplatform import services
from ipaplatform.paths import paths
from ipaserver.install import installutils, certs
from ipaserver.install.replication import replica_conn_check
from ipalib import api, errors, x509
from ipapython.dn import DN
from . import conncheck, dogtag, cainstance
if six.PY3:
unicode = str
VALID_SUBJECT_BASE_ATTRS = {
'st', 'o', 'ou', 'dnqualifier', 'c', 'serialnumber', 'l', 'title', 'sn',
'givenname', 'initials', 'generationqualifier', 'dc', 'mail', 'uid',
'postaladdress', 'postalcode', 'postofficebox', 'houseidentifier', 'e',
'street', 'pseudonym', 'incorporationlocality', 'incorporationstate',
'incorporationcountry', 'businesscategory',
}
VALID_SUBJECT_ATTRS = {'cn'} | VALID_SUBJECT_BASE_ATTRS
logger = logging.getLogger(__name__)
external_cert_file = None
external_ca_file = None
def subject_validator(valid_attrs, value):
if not isinstance(value, unicode):
v = unicode(value, 'utf-8')
else:
v = value
if any(ord(c) < 0x20 for c in v):
raise ValueError("must not contain control characters")
if '&' in v:
raise ValueError("must not contain an ampersand (\"&\")")
try:
dn = DN(v)
for rdn in dn:
if rdn.attr.lower() not in valid_attrs:
raise ValueError("invalid attribute: \"%s\"" % rdn.attr)
except ValueError as e:
raise ValueError("invalid DN: %s" % e)
def lookup_ca_subject(api, subject_base):
dn = DN(('cn', IPA_CA_CN), api.env.container_ca, api.env.basedn)
try:
# we do not use api.Command.ca_show because it attempts to
# talk to the CA (to read certificate / chain), but the RA
# backend may be unavailable (ipa-replica-install) or unusable
# due to RA Agent cert not yet created (ipa-ca-install).
ca_subject = api.Backend.ldap2.get_entry(dn)['ipacasubjectdn'][0]
except errors.NotFound:
# if the entry doesn't exist, we are dealing with a pre-v4.4
# installation, where the default CA subject was always based
# on the subject_base.
#
# installutils.default_ca_subject_dn is NOT used here in
# case the default changes in the future.
ca_subject = DN(('CN', 'Certificate Authority'), subject_base)
return str(ca_subject)
def set_subject_base_in_config(subject_base):
entry_attrs = api.Backend.ldap2.get_ipa_config()
entry_attrs['ipacertificatesubjectbase'] = [str(subject_base)]
try:
api.Backend.ldap2.update_entry(entry_attrs)
except errors.EmptyModlist:
pass
def print_ca_configuration(options):
"""Print info about how the CA will be configured.
Does not print trailing empty line.
"""
print("The CA will be configured with:")
print("Subject DN: {}".format(options.ca_subject))
print("Subject base: {}".format(options.subject_base))
if options.external_ca:
chaining = "externally signed (two-step installation)"
elif options.external_cert_files:
chaining = "externally signed"
else:
chaining = "self-signed"
print("Chaining: {}".format(chaining))
def uninstall_check(options):
"""Check if the host is CRL generation master"""
# Skip the checks if the host is not a CA instance
ca = cainstance.CAInstance(api.env.realm)
if not (api.Command.ca_is_enabled()['result'] and
cainstance.is_ca_installed_locally()):
return
# skip the checks if the host is the last master
ipa_config = api.Command.config_show()['result']
ipa_masters = ipa_config.get('ipa_master_server', [])
if len(ipa_masters) <= 1:
return
try:
crlgen_enabled = ca.is_crlgen_enabled()
except cainstance.InconsistentCRLGenConfigException:
# If config is inconsistent, let's be safe and act as if
# crl gen was enabled
crlgen_enabled = True
if crlgen_enabled:
print("Deleting this server will leave your installation "
"without a CRL generation master.")
if (options.unattended and not options.ignore_last_of_role) or \
not (options.unattended or ipautil.user_input(
"Are you sure you want to continue with the uninstall "
"procedure?", False)):
raise ScriptError("Aborting uninstall operation.")
def install_check(standalone, replica_config, options):
global external_cert_file
global external_ca_file
realm_name = options.realm_name
host_name = options.host_name
if replica_config is None:
options._subject_base = options.subject_base
options._ca_subject = options.ca_subject
else:
# during replica install, this gets invoked before local DS is
# available, so use the remote api.
_api = api if standalone else options._remote_api
# for replica-install the knobs cannot be written, hence leading '_'
options._subject_base = str(replica_config.subject_base)
options._ca_subject = lookup_ca_subject(_api, options._subject_base)
if replica_config is not None and not replica_config.setup_ca:
return
if replica_config is not None:
if standalone and api.env.ra_plugin == 'selfsign':
raise ScriptError('A selfsign CA can not be added')
if standalone and not options.skip_conncheck:
principal = options.principal
replica_conn_check(
replica_config.ca_host_name, host_name, realm_name, True,
replica_config.ca_ds_port, options.admin_password,
principal=principal, ca_cert_file=options.ca_cert_file)
if options.skip_schema_check:
logger.info("Skipping CA DS schema check")
return
if standalone:
if api.Command.ca_is_enabled()['result']:
raise ScriptError(
"One or more CA masters are already present in IPA realm "
"'%s'.\nIf you wish to replicate CA to this host, please "
"re-run 'ipa-ca-install'\nwith a replica file generated on "
"an existing CA master as argument." % realm_name
)
if options.external_cert_files:
if not cainstance.is_step_one_done():
# This can happen if someone passes external_ca_file without
# already having done the first stage of the CA install.
raise ScriptError(
"CA is not installed yet. To install with an external CA "
"is a two-stage process.\nFirst run the installer with "
"--external-ca.")
external_cert_file, external_ca_file = installutils.load_external_cert(
options.external_cert_files, options._ca_subject)
elif options.external_ca:
if cainstance.is_step_one_done():
raise ScriptError(
"CA is already installed.\nRun the installer with "
"--external-cert-file.")
if os.path.isfile(paths.ROOT_IPA_CSR):
raise ScriptError(
"CA CSR file %s already exists.\nIn order to continue "
"remove the file and run the installer again." %
paths.ROOT_IPA_CSR)
if not options.external_ca_type:
options.external_ca_type = x509.ExternalCAType.GENERIC.value
if options.external_ca_profile is not None:
# check that profile is valid for the external ca type
if options.external_ca_type \
not in options.external_ca_profile.valid_for:
raise ScriptError(
"External CA profile specification '{}' "
"cannot be used with external CA type '{}'."
.format(
options.external_ca_profile.unparsed_input,
options.external_ca_type)
)
if not options.external_cert_files:
if not cainstance.check_ports():
print(
"IPA requires ports 8080 and 8443 for PKI, but one or more "
"are currently in use."
)
raise ScriptError("Aborting installation")
if standalone:
dirname = dsinstance.config_dirname(
ipaldap.realm_to_serverid(realm_name))
cadb = certs.CertDB(realm_name, nssdir=paths.PKI_TOMCAT_ALIAS_DIR,
subject_base=options._subject_base)
dsdb = certs.CertDB(
realm_name, nssdir=dirname, subject_base=options._subject_base)
# Check that we can add our CA cert to DS and PKI NSS databases
for db in (cadb, dsdb):
if not db.exists():
continue
for nickname, _trust_flags in db.list_certs():
if nickname == certdb.get_ca_nickname(realm_name):
raise ScriptError(
"Certificate with nickname %s is present in %s, "
"cannot continue." % (nickname, db.secdir))
cert = db.get_cert_from_db(nickname)
if not cert:
continue
subject = DN(cert.subject)
if subject == DN(options._ca_subject):
raise ScriptError(
"Certificate with subject %s is present in %s, "
"cannot continue." % (subject, db.secdir))
def install(standalone, replica_config, options, custodia):
install_step_0(standalone, replica_config, options, custodia=custodia)
install_step_1(standalone, replica_config, options, custodia=custodia)
def install_step_0(standalone, replica_config, options, custodia):
realm_name = options.realm_name
dm_password = options.dm_password
host_name = options.host_name
ca_subject = options._ca_subject
subject_base = options._subject_base
external_ca_profile = None
if replica_config is None:
ca_signing_algorithm = options.ca_signing_algorithm
if options.external_ca:
ca_type = options.external_ca_type
external_ca_profile = options.external_ca_profile
csr_file = paths.ROOT_IPA_CSR
else:
ca_type = None
csr_file = None
if options.external_cert_files:
cert_file = external_cert_file.name
cert_chain_file = external_ca_file.name
else:
cert_file = None
cert_chain_file = None
pkcs12_info = None
master_host = None
master_replication_port = None
ra_p12 = None
ra_only = False
promote = False
else:
cafile = os.path.join(replica_config.dir, 'cacert.p12')
custodia.get_ca_keys(
cafile,
replica_config.dirman_password)
ca_signing_algorithm = None
ca_type = None
csr_file = None
cert_file = None
cert_chain_file = None
pkcs12_info = (cafile,)
master_host = replica_config.ca_host_name
master_replication_port = replica_config.ca_ds_port
ra_p12 = os.path.join(replica_config.dir, 'ra.p12')
ra_only = not replica_config.setup_ca
promote = True
# if upgrading from CA-less to CA-ful, need to rewrite
# certmap.conf and subject_base configuration
#
set_subject_base_in_config(subject_base)
sysupgrade.set_upgrade_state(
'certmap.conf', 'subject_base', str(subject_base))
dsinstance.write_certmap_conf(realm_name, ca_subject)
# use secure ldaps when installing a replica or upgrading to CA-ful
# In both cases, 389-DS is already configured to have a trusted cert.
use_ldaps = standalone or replica_config is not None
ca = cainstance.CAInstance(
realm=realm_name, host_name=host_name, custodia=custodia
)
ca.configure_instance(
host_name, dm_password, dm_password,
subject_base=subject_base,
ca_subject=ca_subject,
ca_signing_algorithm=ca_signing_algorithm,
ca_type=ca_type,
external_ca_profile=external_ca_profile,
csr_file=csr_file,
cert_file=cert_file,
cert_chain_file=cert_chain_file,
pkcs12_info=pkcs12_info,
master_host=master_host,
master_replication_port=master_replication_port,
ra_p12=ra_p12,
ra_only=ra_only,
promote=promote,
use_ldaps=use_ldaps,
pki_config_override=options.pki_config_override,
)
def install_step_1(standalone, replica_config, options, custodia):
if replica_config is not None and not replica_config.setup_ca:
return
realm_name = options.realm_name
host_name = options.host_name
subject_base = options._subject_base
basedn = ipautil.realm_to_suffix(realm_name)
ca = cainstance.CAInstance(
realm=realm_name, host_name=host_name, custodia=custodia
)
ca.stop('pki-tomcat')
# This is done within stopped_service context, which restarts CA
ca.enable_client_auth_to_db()
# Lightweight CA key retrieval is configured in step 1 instead
# of CAInstance.configure_instance (which is invoked from step
# 0) because kadmin_addprinc fails until krb5.conf is installed
# by krb.create_instance.
#
ca.setup_lightweight_ca_key_retrieval()
serverid = ipaldap.realm_to_serverid(realm_name)
if standalone and replica_config is None:
dirname = dsinstance.config_dirname(serverid)
# Store the new IPA CA cert chain in DS NSS database and LDAP
cadb = certs.CertDB(
realm_name, nssdir=paths.PKI_TOMCAT_ALIAS_DIR,
subject_base=subject_base)
dsdb = certs.CertDB(
realm_name, nssdir=dirname, subject_base=subject_base)
cacert = cadb.get_cert_from_db('caSigningCert cert-pki-ca')
nickname = certdb.get_ca_nickname(realm_name)
trust_flags = certdb.IPA_CA_TRUST_FLAGS
dsdb.add_cert(cacert, nickname, trust_flags)
certstore.put_ca_cert_nss(api.Backend.ldap2, api.env.basedn,
cacert, nickname, trust_flags,
config_ipa=True, config_compat=True)
# Store DS CA cert in Dogtag NSS database
trust_flags = dict(reversed(dsdb.list_certs()))
server_certs = dsdb.find_server_certs()
trust_chain = dsdb.find_root_cert(server_certs[0][0])[:-1]
nickname = trust_chain[-1]
cert = dsdb.get_cert_from_db(nickname)
cadb.add_cert(cert, nickname, trust_flags[nickname])
installutils.restart_dirsrv()
ca.start('pki-tomcat')
if standalone or replica_config is not None:
# We need to restart apache as we drop a new config file in there
services.knownservices.httpd.restart(capture_output=True)
if standalone:
# Install CA DNS records
if bindinstance.dns_container_exists(basedn):
bind = bindinstance.BindInstance()
bind.update_system_records()
def uninstall():
ca_instance = cainstance.CAInstance(api.env.realm)
ca_instance.stop_tracking_certificates()
ipautil.remove_file(paths.RA_AGENT_PEM)
ipautil.remove_file(paths.RA_AGENT_KEY)
if ca_instance.is_configured():
ca_instance.uninstall()
class CASigningAlgorithm(enum.Enum):
SHA1_WITH_RSA = 'SHA1withRSA'
SHA_256_WITH_RSA = 'SHA256withRSA'
SHA_384_WITH_RSA = 'SHA384withRSA'
SHA_512_WITH_RSA = 'SHA512withRSA'
@group
class CAInstallInterface(dogtag.DogtagInstallInterface,
conncheck.ConnCheckInterface):
"""
Interface of the CA installer
Knobs defined here will be available in:
* ipa-server-install
* ipa-replica-prepare
* ipa-replica-install
* ipa-ca-install
"""
description = "Certificate system"
principal = conncheck.ConnCheckInterface.principal
principal = extend_knob(
principal,
description="User allowed to manage replicas",
cli_names=list(principal.cli_names) + ['-P'],
)
principal = enroll_only(principal)
principal = replica_install_only(principal)
admin_password = conncheck.ConnCheckInterface.admin_password
admin_password = extend_knob(
admin_password,
description="Admin user Kerberos password used for connection check",
cli_names=list(admin_password.cli_names) + ['-w'],
)
admin_password = enroll_only(admin_password)
external_ca = knob(
None,
description=("Generate a CSR for the IPA CA certificate to be signed "
"by an external CA"),
)
external_ca = master_install_only(external_ca)
external_ca_type = knob(
x509.ExternalCAType, None, description="Type of the external CA")
external_ca_type = master_install_only(external_ca_type)
external_ca_profile = knob(
type=x509.ExternalCAProfile,
default=None,
description=(
"Specify the certificate profile/template to use at the "
"external CA"),
)
external_ca_profile = master_install_only(external_ca_profile)
external_cert_files = knob(
# pylint: disable=invalid-sequence-index
typing.List[str], None,
description=("File containing the IPA CA certificate and the external "
"CA certificate chain"),
cli_names='--external-cert-file',
cli_deprecated_names=['--external_cert_file', '--external_ca_file'],
cli_metavar='FILE',
)
external_cert_files = master_install_only(external_cert_files)
@external_cert_files.validator
def external_cert_files(self, value):
if any(not os.path.isabs(path) for path in value):
raise ValueError("must use an absolute path")
subject_base = knob(
str, None,
description=(
"The certificate subject base (default O=<realm-name>). "
"RDNs are in LDAP order (most specific RDN first)."
),
cli_deprecated_names=['--subject'],
)
subject_base = master_install_only(subject_base)
@subject_base.validator
def subject_base(self, value):
subject_validator(VALID_SUBJECT_BASE_ATTRS, value)
ca_subject = knob(
str, None,
description=(
"The CA certificate subject DN "
"(default CN=Certificate Authority,O=<realm-name>). "
"RDNs are in LDAP order (most specific RDN first)."
),
)
ca_subject = master_install_only(ca_subject)
@ca_subject.validator
def ca_subject(self, value):
subject_validator(VALID_SUBJECT_ATTRS, value)
ca_signing_algorithm = knob(
CASigningAlgorithm, None,
description="Signing algorithm of the IPA CA certificate",
)
ca_signing_algorithm = master_install_only(ca_signing_algorithm)
skip_schema_check = knob(
None,
description="skip check for updated CA DS schema on the remote master",
)
skip_schema_check = enroll_only(skip_schema_check)
skip_schema_check = replica_install_only(skip_schema_check)