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# Authors: Ade Lee <alee@redhat.com>
#
# Copyright (C) 2014  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 os
import pwd
import shutil
import sys
import tempfile

from six.moves.configparser import ConfigParser

from ipalib import api
from ipalib import x509
from ipaplatform import services
from ipaplatform.paths import paths
from ipapython import certdb
from ipapython import dogtag
from ipapython import ipautil
from ipapython.dn import DN
from ipaserver.install import certs
from ipaserver.install import cainstance
from ipaserver.install import installutils
from ipaserver.install import ldapupdate
from ipaserver.install import service
from ipaserver.install.dogtaginstance import (
    DEFAULT_DSPORT, PKI_USER, export_kra_agent_pem, DogtagInstance)
from ipaserver.plugins import ldap2
from ipapython.ipa_log_manager import log_mgr

# When IPA is installed with DNS support, this CNAME should hold all IPA
# replicas with KRA configured
IPA_KRA_RECORD = "ipa-kra"

ADMIN_GROUPS = [
    'Enterprise CA Administrators',
    'Enterprise KRA Administrators',
    'Security Domain Administrators'
]

class KRAInstance(DogtagInstance):
    """
    We assume that the CA has already been installed, and we use the
    same tomcat instance to host both the CA and KRA.
    The mod_nss database will contain the RA agent cert that will be used
    to do authenticated requests against dogtag.  The RA agent cert will
    be the same for both the CA and KRA.
    """

    tracking_reqs = (('auditSigningCert cert-pki-kra', None),
                     ('transportCert cert-pki-kra', None),
                     ('storageCert cert-pki-kra', None))

    def __init__(self, realm, dogtag_constants=None):
        if dogtag_constants is None:
            dogtag_constants = dogtag.configured_constants()

        super(KRAInstance, self).__init__(
            realm=realm,
            subsystem="KRA",
            service_desc="KRA server",
            dogtag_constants=dogtag_constants
        )

        self.basedn = DN(('o', 'kra'), ('o', 'ipaca'))
        self.log = log_mgr.get_logger(self)

    def configure_instance(self, realm_name, host_name, dm_password,
                           admin_password, ds_port=DEFAULT_DSPORT,
                           pkcs12_info=None, master_host=None,
                           subject_base=None):
        """Create a KRA instance.

           To create a clone, pass in pkcs12_info.
        """
        self.fqdn = host_name
        self.dm_password = dm_password
        self.admin_password = admin_password
        self.ds_port = ds_port
        self.pkcs12_info = pkcs12_info
        if self.pkcs12_info is not None:
            self.clone = True
        self.master_host = master_host
        if subject_base is None:
            self.subject_base = DN(('O', self.realm))
        else:
            self.subject_base = subject_base
        self.realm = realm_name
        self.suffix = ipautil.realm_to_suffix(realm_name)

        # Confirm that a KRA does not already exist
        if self.is_installed():
            raise RuntimeError(
                "KRA already installed.")
        # Confirm that a Dogtag 10 CA instance already exists
        ca = cainstance.CAInstance(
            api.env.realm, certs.NSS_DIR,
            dogtag_constants=dogtag.Dogtag10Constants)
        if not ca.is_installed():
            raise RuntimeError(
                "KRA configuration failed.  "
                "A Dogtag CA must be installed first")

        self.step("configuring KRA instance", self.__spawn_instance)
        if not self.clone:
            self.step("create KRA agent",
                      self.__create_kra_agent)
        self.step("restarting KRA", self.restart_instance)
        self.step("configure certmonger for renewals",
                  self.configure_certmonger_renewal)
        self.step("configure certificate renewals", self.configure_renewal)
        self.step("configure HTTP to proxy connections",
                  self.http_proxy)
        self.step("add vault container", self.__add_vault_container)
        self.step("apply LDAP updates", self.__apply_updates)

        self.start_creation(runtime=126)

    def __spawn_instance(self):
        """
        Create and configure a new KRA instance using pkispawn.
        Creates a configuration file with IPA-specific
        parameters and passes it to the base class to call pkispawn
        """

        # Create an empty and secured file
        (cfg_fd, cfg_file) = tempfile.mkstemp()
        os.close(cfg_fd)
        pent = pwd.getpwnam(PKI_USER)
        os.chown(cfg_file, pent.pw_uid, pent.pw_gid)

        # Create KRA configuration
        config = ConfigParser()
        config.optionxform = str
        config.add_section("KRA")

        # Security Domain Authentication
        config.set("KRA", "pki_security_domain_https_port", "443")
        config.set("KRA", "pki_security_domain_password", self.admin_password)
        config.set("KRA", "pki_security_domain_user", self.admin_user)

        # issuing ca
        config.set("KRA", "pki_issuing_ca_uri", "https://%s" %
                   ipautil.format_netloc(self.fqdn, 443))

        # Server
        config.set("KRA", "pki_enable_proxy", "True")
        config.set("KRA", "pki_restart_configured_instance", "False")
        config.set("KRA", "pki_backup_keys", "True")
        config.set("KRA", "pki_backup_password", self.admin_password)

        # Client security database
        config.set("KRA", "pki_client_database_dir", self.agent_db)
        config.set("KRA", "pki_client_database_password", self.admin_password)
        config.set("KRA", "pki_client_database_purge", "False")
        config.set("KRA", "pki_client_pkcs12_password", self.admin_password)

        # Administrator
        config.set("KRA", "pki_admin_name", self.admin_user)
        config.set("KRA", "pki_admin_uid", self.admin_user)
        config.set("KRA", "pki_admin_email", "root@localhost")
        config.set("KRA", "pki_admin_password", self.admin_password)
        config.set("KRA", "pki_admin_nickname", "ipa-ca-agent")
        config.set("KRA", "pki_admin_subject_dn",
                   str(DN(('cn', 'ipa-ca-agent'), self.subject_base)))
        config.set("KRA", "pki_import_admin_cert", "True")
        config.set("KRA", "pki_admin_cert_file", paths.ADMIN_CERT_PATH)
        config.set("KRA", "pki_client_admin_cert_p12", paths.DOGTAG_ADMIN_P12)

        # Directory server
        config.set("KRA", "pki_ds_ldap_port", str(self.ds_port))
        config.set("KRA", "pki_ds_password", self.dm_password)
        config.set("KRA", "pki_ds_base_dn", self.basedn)
        config.set("KRA", "pki_ds_database", "ipaca")
        config.set("KRA", "pki_ds_create_new_db", "False")

        # Certificate subject DNs
        config.set("KRA", "pki_subsystem_subject_dn",
                   str(DN(('cn', 'CA Subsystem'), self.subject_base)))
        config.set("KRA", "pki_ssl_server_subject_dn",
                   str(DN(('cn', self.fqdn), self.subject_base)))
        config.set("KRA", "pki_audit_signing_subject_dn",
                   str(DN(('cn', 'KRA Audit'), self.subject_base)))
        config.set(
            "KRA", "pki_transport_subject_dn",
            str(DN(('cn', 'KRA Transport Certificate'), self.subject_base)))
        config.set(
            "KRA", "pki_storage_subject_dn",
            str(DN(('cn', 'KRA Storage Certificate'), self.subject_base)))

        # Certificate nicknames
        # Note that both the server certs and subsystem certs reuse
        # the ca certs.
        config.set("KRA", "pki_subsystem_nickname",
                   "subsystemCert cert-pki-ca")
        config.set("KRA", "pki_ssl_server_nickname",
                   "Server-Cert cert-pki-ca")
        config.set("KRA", "pki_audit_signing_nickname",
                   "auditSigningCert cert-pki-kra")
        config.set("KRA", "pki_transport_nickname",


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