#! /usr/bin/python -E
# 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; version 2 or later
#
# 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, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#

import shutil
import logging
import pwd
import glob
import sys
import os

from ipa import ipautil

import service
import installutils
import certs
import ipaldap, ldap

SERVER_ROOT_64 = "/usr/lib64/dirsrv"
SERVER_ROOT_32 = "/usr/lib/dirsrv"

def realm_to_suffix(realm_name):
    s = realm_name.split(".")
    terms = ["dc=" + x.lower() for x in s]
    return ",".join(terms)

def find_server_root():
    if ipautil.dir_exists(SERVER_ROOT_64):
        return SERVER_ROOT_64
    else:
        return SERVER_ROOT_32

def realm_to_serverid(realm_name):
    return "-".join(realm_name.split("."))

def config_dirname(realm_name):
    return "/etc/dirsrv/slapd-" + realm_to_serverid(realm_name) + "/"

def schema_dirname(realm_name):
    return config_dirname(realm_name) + "/schema/"

def erase_ds_instance_data(serverid):
    try:
        shutil.rmtree("/etc/dirsrv/slapd-%s" % serverid)
    except:
        pass
    try:
        shutil.rmtree("/var/lib/dirsrv/slapd-%s" % serverid)
    except:
        pass
    try:
        shutil.rmtree("/var/lock/dirsrv/slapd-%s" % serverid)
    except:
        pass

def check_existing_installation():
    dirs = glob.glob("/etc/dirsrv/slapd-*")
    if not dirs:
        return
    print ""
    print "An existing Directory Server has been detected."
    yesno = raw_input("Do you wish to remove it and create a new one? [no]: ")
    if not yesno or yesno.lower()[0] != "y":
        sys.exit(1)

    try:
        service.stop("dirsrv")
    except:
        pass
    for d in dirs:
        serverid = os.path.basename(d).split("slapd-", 1)[1]
        if serverid:
            erase_ds_instance_data(serverid)

def check_ports():
    ds_unsecure = installutils.port_available(389)
    ds_secure = installutils.port_available(636)
    if not ds_unsecure or not ds_secure:
        print "IPA requires ports 389 and 636 for the Directory Server."
        print "These are currently in use:"
        if not ds_unsecure:
            print "\t389"
        if not ds_secure:
            print "\t636"
        sys.exit(1)


INF_TEMPLATE = """
[General]
FullMachineName=   $FQHN
SuiteSpotUserID=   $USER
ServerRoot=    $SERVER_ROOT
[slapd]
ServerPort=   389
ServerIdentifier=   $SERVERID
Suffix=   $SUFFIX
RootDN=   cn=Directory Manager
RootDNPwd= $PASSWORD
"""

class DsInstance(service.Service):
    def __init__(self):
        service.Service.__init__(self, "dirsrv")
        self.serverid = None
        self.realm_name = None
        self.suffix = None
        self.host_name = None
        self.dm_password = None
        self.sub_dict = None
        self.domain = None

    def create_instance(self, ds_user, realm_name, host_name, dm_password, pkcs12_info=None):
        self.ds_user = ds_user
        self.realm_name = realm_name.upper()
        self.serverid = realm_to_serverid(self.realm_name)
        self.suffix = realm_to_suffix(self.realm_name)
        self.host_name = host_name
        self.dm_password = dm_password
        self.domain = host_name[host_name.find(".")+1:]
        self.pkcs12_info = pkcs12_info
        self.__setup_sub_dict()
        
        self.step("creating directory server user", self.__create_ds_user)
        self.step("creating directory server instance", self.__create_instance)
        self.step("adding default schema", self.__add_default_schemas)
        self.step("enabling memberof plugin", self.__add_memberof_module)
        self.step("enabling referential integrity plugin", self.__add_referint_module)
        self.step("enabling distributed numeric assignment plugin", self.__add_dna_module)
        self.step("creating indeces", self.__create_indeces)
        self.step("configuring ssl for ds instance", self.__enable_ssl)
        self.step("configuring certmap.conf", self.__certmap_conf)
        self.step("restarting directory server", self.__restart_instance)
        self.step("adding default layout", self.__add_default_layout)
        self.step("configuring Posix uid/gid generation as first master",
                  self.__config_uidgid_gen_first_master)
        self.step("adding master entry as first master",
                  self.__add_master_entry_first_master)
        self.step("initializing group membership",
                  self.__init_memberof)

        self.step("configuring directory to start on boot", self.__enable)

        self.start_creation("Configuring directory server:")

    def __enable(self):
        self.backup_state("enabled", self.is_enabled())
        self.chkconfig_on()

    def __setup_sub_dict(self):
        server_root = find_server_root()
        self.sub_dict = dict(FQHN=self.host_name, SERVERID=self.serverid,
                             PASSWORD=self.dm_password, SUFFIX=self.suffix.lower(),
                             REALM=self.realm_name, USER=self.ds_user,
                             SERVER_ROOT=server_root, DOMAIN=self.domain)

    def __create_ds_user(self):
        user_exists = True
	try:
            pwd.getpwnam(self.ds_user)
            logging.debug("ds user %s exists" % self.ds_user)
	except KeyError:
            user_exists = False
            logging.debug("adding ds user %s" % self.ds_user)
            args = ["/usr/sbin/useradd", "-c", "DS System User", "-d", "/var/lib/dirsrv", "-M", "-r", "-s", "/sbin/nologin", self.ds_user]
            try:
                ipautil.run(args)
                logging.debug("done adding user")
            except ipautil.CalledProcessError, e:
                logging.critical("failed to add user %s" % e)

        self.backup_state("user", self.ds_user)
        self.backup_state("user_exists", user_exists)

    def __create_instance(self):
        self.backup_state("running", self.is_running())
        self.backup_state("serverid", self.serverid)
        inf_txt = ipautil.template_str(INF_TEMPLATE, self.sub_dict)
        logging.debug(inf_txt)
        inf_fd = ipautil.write_tmp_file(inf_txt)
        logging.debug("writing inf template")
        if ipautil.file_exists("/usr/sbin/setup-ds.pl"):
            args = ["/usr/sbin/setup-ds.pl", "--silent", "--logfile", "-", "-f", inf_fd.name]
            logging.debug("calling setup-ds.pl")
        else:
            args = ["/usr/bin/ds_newinst.pl", inf_fd.name]
            logging.debug("calling ds_newinst.pl")
        try:
            ipautil.run(args)
            logging.debug("completed creating ds instance")
        except ipautil.CalledProcessError, e:
            logging.critical("failed to restart ds instance %s" % e)
        logging.debug("restarting ds instance")
        try:
            self.restart()
            logging.debug("done restarting ds instance")
        except ipautil.CalledProcessError, e:
            print "failed to restart ds instance", e
            logging.debug("failed to restart ds instance %s" % e)

    def __add_default_schemas(self):
        shutil.copyfile(ipautil.SHARE_DIR + "60kerberos.ldif",
                        schema_dirname(self.realm_name) + "60kerberos.ldif")
        shutil.copyfile(ipautil.SHARE_DIR + "60samba.ldif",
                        schema_dirname(self.realm_name) + "60samba.ldif")
        shutil.copyfile(ipautil.SHARE_DIR + "60radius.ldif",
                        schema_dirname(self.realm_name) + "60radius.ldif")
        shutil.copyfile(ipautil.SHARE_DIR + "60ipaconfig.ldif",
                        schema_dirname(self.realm_name) + "60ipaconfig.ldif")

    def __restart_instance(self):
        try:
            self.restart()
        except:
            # TODO: roll back here?
            logging.critical("Failed to restart the ds instance")

    def __ldap_mod(self, ldif, sub_dict = None):
        fd = None
        path = ipautil.SHARE_DIR + ldif

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

        args = ["/usr/bin/ldapmodify", "-h", "127.0.0.1", "-xv",
                "-D", "cn=Directory Manager", "-w", self.dm_password, "-f", path]

        try:
            ipautil.run(args)
        except ipautil.CalledProcessError, e:
            logging.critical("Failed to load %s: %s" % (ldif, str(e)))

        if not fd is None:
            fd.close()

    def __add_memberof_module(self):
        self.__ldap_mod("memberof-conf.ldif")

    def __init_memberof(self):
        self.__ldap_mod("memberof-task.ldif", self.sub_dict)

    def __add_referint_module(self):
        self.__ldap_mod("referint-conf.ldif")

    def __add_dna_module(self):
        self.__ldap_mod("dna-conf.ldif")

    def __config_uidgid_gen_first_master(self):
        self.__ldap_mod("dna-posix.ldif", self.sub_dict)

    def __add_master_entry_first_master(self):
        self.__ldap_mod("master-entry.ldif", self.sub_dict)

    def __enable_ssl(self):
        dirname = config_dirname(self.realm_name)
        ca = certs.CertDB(dirname)
        if self.pkcs12_info:
            ca.create_from_pkcs12(self.pkcs12_info[0], self.pkcs12_info[1])
            ca.cur_serial = 2100
        else:
            ca.create_self_signed()
        ca.create_server_cert("Server-Cert", "cn=%s,ou=Fedora Directory Server" % self.host_name)

        conn = ipaldap.IPAdmin("127.0.0.1")
        conn.simple_bind_s("cn=directory manager", self.dm_password)

        mod = [(ldap.MOD_REPLACE, "nsSSLClientAuth", "allowed"),
               (ldap.MOD_REPLACE, "nsSSL3Ciphers",
                "-rsa_null_md5,+rsa_rc4_128_md5,+rsa_rc4_40_md5,+rsa_rc2_40_md5,\
+rsa_des_sha,+rsa_fips_des_sha,+rsa_3des_sha,+rsa_fips_3des_sha,+fortezza,\
+fortezza_rc4_128_sha,+fortezza_null,+tls_rsa_export1024_with_rc4_56_sha,\
+tls_rsa_export1024_with_des_cbc_sha")]
        conn.modify_s("cn=encryption,cn=config", mod)

        mod = [(ldap.MOD_ADD, "nsslapd-security", "on"),
               (ldap.MOD_REPLACE, "nsslapd-ssl-check-hostname", "off")]
        conn.modify_s("cn=config", mod)

        entry = ipaldap.Entry("cn=RSA,cn=encryption,cn=config")
        
        entry.setValues("objectclass", "top", "nsEncryptionModule")
        entry.setValues("cn", "RSA")
        entry.setValues("nsSSLPersonalitySSL", "Server-Cert")
        entry.setValues("nsSSLToken", "internal (software)")
        entry.setValues("nsSSLActivation", "on")

        conn.addEntry(entry)
        
        conn.unbind()

    def __add_default_layout(self):
        self.__ldap_mod("bootstrap-template.ldif", self.sub_dict)
        
    def __create_indeces(self):
        self.__ldap_mod("indeces.ldif")

    def __certmap_conf(self):
        shutil.copyfile(ipautil.SHARE_DIR + "certmap.conf.template",
                        config_dirname(self.realm_name) + "certmap.conf")

    def change_admin_password(self, password):
        logging.debug("Changing admin password")
        dirname = config_dirname(self.realm_name)
        if ipautil.dir_exists("/usr/lib64/mozldap"):
            app = "/usr/lib64/mozldap/ldappasswd"
        else:
            app = "/usr/lib/mozldap/ldappasswd"
        args = [app,
                "-D", "cn=Directory Manager", "-w", self.dm_password,
                "-P", dirname+"/cert8.db", "-ZZZ", "-s", password,
                "uid=admin,cn=sysaccounts,cn=etc,"+self.suffix]
        try:
            ipautil.run(args)
            logging.debug("ldappasswd done")
        except ipautil.CalledProcessError, e:
            print "Unable to set admin password", e
            logging.debug("Unable to set admin password %s" % e)

    def uninstall(self):
        running = self.restore_state("running")
        enabled = self.restore_state("enabled")

        if not running is None:
            self.stop()

        if not enabled is None and not enabled:
            self.chkconfig_off()

        serverid = self.restore_state("serverid")
        if not serverid is None:
            erase_ds_instance_data(serverid)

        ds_user = self.restore_state("user")
        user_exists = self.restore_state("user_exists")

        if not ds_user is None and not user_exists is None and not user_exists:
            try:
                ipautil.run(["/usr/sbin/userdel", ds_user])
            except ipautil.CalledProcessError, e:
                logging.critical("failed to delete user %s" % e)

        if self.restore_state("running"):
            self.start()