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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/>.
#

import sys
import os, socket
import tempfile
import time
import datetime
import traceback

from ipapython import sysrestore, ipautil, dogtag, ipaldap
from ipapython.dn import DN
from ipapython.ipa_log_manager import *
from ipalib import errors, certstore
from ipaplatform import services
from ipaplatform.paths import paths


# The service name as stored in cn=masters,cn=ipa,cn=etc. In the tuple
# the first value is the *nix service name, the second the start order.
SERVICE_LIST = {
    'KDC': ('krb5kdc', 10),
    'KPASSWD': ('kadmin', 20),
    'DNS': ('named', 30),
    'MEMCACHE': ('ipa_memcached', 39),
    'HTTP': ('httpd', 40),
    'CA': ('%sd' % dogtag.configured_constants().PKI_INSTANCE_NAME, 50),
    'ADTRUST': ('smb', 60),
    'EXTID': ('winbind', 70),
    'OTPD': ('ipa-otpd', 80),
    'DNSKeyExporter': ('ipa-ods-exporter', 90),
    'DNSSEC': ('ods-enforcerd', 100),
    'DNSKeySync': ('ipa-dnskeysyncd', 110),
}

def print_msg(message, output_fd=sys.stdout):
    root_logger.debug(message)
    output_fd.write(message)
    output_fd.write("\n")
    output_fd.flush()


def format_seconds(seconds):
    """Format a number of seconds as an English minutes+seconds message"""
    parts = []
    minutes, seconds = divmod(seconds, 60)
    if minutes:
        parts.append('%d minute' % minutes)
        if minutes != 1:
            parts[-1] += 's'
    if seconds or not minutes:
        parts.append('%d second' % seconds)
        if seconds != 1:
            parts[-1] += 's'
    return ' '.join(parts)


class Service(object):
    def __init__(self, service_name, service_desc=None, sstore=None,
                 dm_password=None, ldapi=True, autobind=ipaldap.AUTOBIND_AUTO,
                 start_tls=False):
        self.service_name = service_name
        self.service_desc = service_desc
        self.service = services.service(service_name)
        self.steps = []
        self.output_fd = sys.stdout
        self.dm_password = dm_password
        self.ldapi = ldapi
        self.autobind = autobind
        self.start_tls = start_tls

        self.fqdn = socket.gethostname()
        self.admin_conn = None

        if sstore:
            self.sstore = sstore
        else:
            self.sstore = sysrestore.StateFile(paths.SYSRESTORE)

        self.realm = None
        self.suffix = DN()
        self.principal = None
        self.dercert = None

    def ldap_connect(self):
        # If DM password is provided, we use it
        # If autobind was requested, attempt autobind when root and ldapi
        # If autobind was disabled or not succeeded, go with GSSAPI
        # LDAPI can be used with either autobind or GSSAPI
        # LDAPI requires realm to be set
        try:
            if self.ldapi:
                if not self.realm:
                    raise errors.NotFound(reason="realm is missing for %s" % (self))
                conn = ipaldap.IPAdmin(ldapi=self.ldapi, realm=self.realm)
            elif self.start_tls:
                conn = ipaldap.IPAdmin(self.fqdn, port=389, protocol='ldap',
                                       cacert=paths.IPA_CA_CRT,
                                       start_tls=self.start_tls)
            else:
                conn = ipaldap.IPAdmin(self.fqdn, port=389)

            conn.do_bind(self.dm_password, autobind=self.autobind)
        except Exception, e:
            root_logger.debug("Could not connect to the Directory Server on %s: %s" % (self.fqdn, str(e)))
            raise

        self.admin_conn = conn

    def ldap_disconnect(self):
        self.admin_conn.unbind()
        self.admin_conn = None

    def _ldap_mod(self, ldif, sub_dict=None):
        pw_name = None
        fd = None
        path = ipautil.SHARE_DIR + ldif
        nologlist = []

        if sub_dict is not None:
            txt = ipautil.template_file(path, sub_dict)
            fd = ipautil.write_tmp_file(txt)
            path = fd.name

            # do not log passwords
            if 'PASSWORD' in sub_dict:
                nologlist.append(sub_dict['PASSWORD'])
            if 'RANDOM_PASSWORD' in sub_dict:
                nologlist.append(sub_dict['RANDOM_PASSWORD'])

        args = [paths.LDAPMODIFY, "-v", "-f", path]

        # As we always connect to the local host,
        # use URI of admin connection
        if not self.admin_conn:
            self.ldap_connect()
        args += ["-H", self.admin_conn.ldap_uri]

        # If DM password is available, use it
        if self.dm_password:
            [pw_fd, pw_name] = tempfile.mkstemp()
            os.write(pw_fd, self.dm_password)
            os.close(pw_fd)
            auth_parms = ["-x", "-D", "cn=Directory Manager", "-y", pw_name]
        # Use GSSAPI auth when not using DM password or not being root
        elif os.getegid() != 0:
            auth_parms = ["-Y", "GSSAPI"]
        # Default to EXTERNAL auth mechanism
        else:
            auth_parms = ["-Y", "EXTERNAL"]

        args += auth_parms

        try:
            try:
                ipautil.run(args, nolog=nologlist)
            except ipautil.CalledProcessError, e:
                root_logger.critical("Failed to load %s: %s" % (ldif, str(e)))
        finally:
            if pw_name:
                os.remove(pw_name)

        if fd is not None:
            fd.close()

    def move_service(self, principal):
        """
        Used to move a principal entry created by kadmin.local from
        cn=kerberos to cn=services
        """

        dn = DN(('krbprincipalname', principal), ('cn', self.realm), ('cn', 'kerberos'), self.suffix)
        try:
            entry = self.admin_conn.get_entry(dn)
        except errors.NotFound:
            # There is no service in the wrong location, nothing to do.
            # This can happen when installing a replica
            return None
        newdn = DN(('krbprincipalname', principal), ('cn', 'services'), ('cn', 'accounts'), self.suffix)


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