#! /usr/bin/python -E
# Authors: Rob Crittenden <rcritten@redhat.com>
#
# Copyright (C) 2011  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 socket

import os, shutil

from ipapython import ipautil
from ipapython import services as ipaservices

from ipaserver.install import installutils, service
from ipaserver.install import certs
from ipaserver.install.installutils import (HostnameLocalhost, ReplicaConfig,
        expand_replica_info, read_replica_info, get_host_name, BadHostError,
        private_ccache)
from ipaserver.install import dsinstance, cainstance, bindinstance
from ipaserver.install.replication import replica_conn_check
from ipapython import version
from ipalib import api, util
from ipapython.dn import DN
from ipapython.config import IPAOptionParser
from ipapython import sysrestore
from ipapython import dogtag
from ipapython.ipa_log_manager import *

log_file_name = "/var/log/ipareplica-ca-install.log"
REPLICA_INFO_TOP_DIR = None

def parse_options():
    usage = "%prog [options] REPLICA_FILE"
    parser = IPAOptionParser(usage=usage, version=version.VERSION)
    parser.add_option("-d", "--debug", dest="debug", action="store_true",
                      default=False, help="gather extra debugging information")
    parser.add_option("-p", "--password", dest="password", sensitive=True,
                      help="Directory Manager (existing master) password")
    parser.add_option("-w", "--admin-password", dest="admin_password", sensitive=True,
                      help="Admin user Kerberos password used for connection check")
    parser.add_option("--no-host-dns", dest="no_host_dns", action="store_true",
                      default=False,
                      help="Do not use DNS for hostname lookup during installation")
    parser.add_option("--skip-conncheck", dest="skip_conncheck", action="store_true",
                      default=False, help="skip connection check to remote master")
    parser.add_option("--skip-schema-check", dest="skip_schema_check", action="store_true",
                      default=False, help="skip check for updated CA DS schema on the remote master")
    parser.add_option("-U", "--unattended", dest="unattended", action="store_true",
                      default=False, help="unattended installation never prompts the user")

    options, args = parser.parse_args()
    safe_options = parser.get_safe_opts(options)

    if len(args) != 1:
        parser.error("you must provide a file generated by ipa-replica-prepare")

    return safe_options, options, args[0]

def get_dirman_password():
    return installutils.read_password("Directory Manager (existing master)", confirm=False, validate=False)

def install_dns_records(config, options):

    if not bindinstance.dns_container_exists(config.master_host_name,
                                             ipautil.realm_to_suffix(config.realm_name),
                                             dm_password=config.dirman_password):
        return

    bind = bindinstance.BindInstance(dm_password=config.dirman_password)
    try:
        api.Backend.ldap2.connect(bind_dn=DN(('cn', 'Directory Manager')),
                                  bind_pw=config.dirman_password)
        bind.add_ipa_ca_dns_records(config.host_name, config.domain_name)
    finally:
        if api.Backend.ldap2.isconnected():
             api.Backend.ldap2.disconnect()

def main():
    safe_options, options, filename = parse_options()

    if os.geteuid() != 0:
        sys.exit("\nYou must be root to run this script.\n")

    standard_logging_setup(log_file_name, debug=options.debug)

    root_logger.debug('%s was invoked with argument "%s" and options: %s' % (sys.argv[0], filename, safe_options))

    if not ipautil.file_exists(filename):
        sys.exit("Replica file %s does not exist" % filename)

    global sstore
    sstore = sysrestore.StateFile('/var/lib/ipa/sysrestore')

    if not dsinstance.DsInstance().is_configured():
        sys.exit("IPA server is not configured on this system.\n")

    api.bootstrap(in_server=True)
    api.finalize()

    if api.env.ra_plugin == 'selfsign':
        sys.exit('A selfsign CA can not be added')

    # get the directory manager password
    dirman_password = options.password
    if not dirman_password:
        if options.unattended:
            sys.exit('Directory Manager password required')
        try:
            dirman_password = get_dirman_password()
        except KeyboardInterrupt:
            sys.exit(0)
        if dirman_password is None:
            sys.exit("\nDirectory Manager password required")

    if not options.admin_password and not options.skip_conncheck and \
        options.unattended:
            sys.exit('admin password required')

    try:
        top_dir, dir = expand_replica_info(filename, dirman_password)
        global REPLICA_INFO_TOP_DIR
        REPLICA_INFO_TOP_DIR = top_dir
    except Exception, e:
        print "ERROR: Failed to decrypt or open the replica file."
        print "Verify you entered the correct Directory Manager password."
        sys.exit(1)

    config = ReplicaConfig()
    read_replica_info(dir, config)
    config.dirman_password = dirman_password
    try:
        host = get_host_name(options.no_host_dns)
    except BadHostError, e:
        root_logger.error(str(e))
        sys.exit(1)
    if config.host_name != host:
        try:
            print "This replica was created for '%s' but this machine is named '%s'" % (config.host_name, host)
            if not ipautil.user_input("This may cause problems. Continue?", True):
                sys.exit(0)
            config.host_name = host
            print ""
        except KeyboardInterrupt:
            sys.exit(0)
    config.dir = dir
    config.setup_ca = True

    portfile = config.dir + "/dogtag_directory_port.txt"
    if not ipautil.file_exists(portfile):
        dogtag_master_ds_port = str(dogtag.Dogtag9Constants.DS_PORT)
    else:
        with open(portfile) as fd:
            dogtag_master_ds_port = fd.read()

    if not options.skip_conncheck:
        replica_conn_check(
            config.master_host_name, config.host_name, config.realm_name, True,
            dogtag_master_ds_port, options.admin_password)

    if options.skip_schema_check:
        root_logger.info("Skipping CA DS schema check")
    else:
        cainstance.replica_ca_install_check(config, dogtag_master_ds_port)

    # Configure the CA if necessary
    CA = cainstance.install_replica_ca(
        config, dogtag_master_ds_port, postinstall=True)

    # We need to ldap_enable the CA now that DS is up and running
    CA.ldap_enable('CA', config.host_name, config.dirman_password,
                   ipautil.realm_to_suffix(config.realm_name))

    CA.enable_client_auth_to_db()
    CA.restart()

    # Install CA DNS records
    install_dns_records(config, options)

    # We need to restart apache as we drop a new config file in there
    ipaservices.knownservices.httpd.restart(capture_output=True)

    #update dogtag version in config file
    try:
        fd = open("/etc/ipa/default.conf", "a")
        fd.write(
            "dogtag_version=%s\n" % dogtag.install_constants.DOGTAG_VERSION)
        fd.close()
    except IOError, e:
        print "Failed to update /etc/ipa/default.conf"
        root_logger.error(str(e))
        sys.exit(1)

fail_message = '''
Your system may be partly configured.
Run /usr/sbin/ipa-server-install --uninstall to clean up.
'''

if __name__ == '__main__':
    try:
        with private_ccache():
            installutils.run_script(main, log_file_name=log_file_name,
                    operation_name='ipa-ca-install',
                    fail_message=fail_message)
    finally:
        # always try to remove decrypted replica file
        try:
            if REPLICA_INFO_TOP_DIR:
                shutil.rmtree(REPLICA_INFO_TOP_DIR)
        except OSError:
            pass