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# Authors: Rob Crittenden <rcritten@redhat.com>
#          Ade Lee <alee@redhat.com>
#          Andrew Wnuk <awnuk@redhat.com>
#
# Copyright (C) 2009  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 logging
import pwd
import os
import sys
import re
import time
import ldap
import base64
import array
import tempfile
import binascii
import shutil
import httplib
import urllib
import xml.dom.minidom
import stat
import socket
from ipapython import dogtag
from ipapython.certdb import get_ca_nickname
from ipalib import pkcs10, x509
import subprocess

from nss.error import NSPRError
import nss.nss as nss

from ipapython import ipautil
from ipapython import nsslib

from ipaserver import ipaldap
from ipaserver.install import service
from ipaserver.install import installutils
from ipaserver.install import dsinstance
from ipaserver.install import certs
from ipalib import util

DEFAULT_DSPORT=7389

PKI_USER = "pkiuser"
PKI_DS_USER = "pkisrv"

# These values come from /usr/share/pki/ca/setup/postinstall
PKI_INSTANCE_NAME="pki-ca"
AGENT_SECURE_PORT=9443
EE_SECURE_PORT=9444
ADMIN_SECURE_PORT=9445
EE_CLIENT_AUTH_PORT=9446
UNSECURE_PORT=9180
TOMCAT_SERVER_PORT=9701

# We need to reset the template because the CA uses the regular boot
# information
INF_TEMPLATE = """
[General]
FullMachineName=   $FQHN
SuiteSpotUserID=   $USER
SuiteSpotGroup=    $GROUP
ServerRoot=    $SERVER_ROOT
[slapd]
ServerPort=   $DSPORT
ServerIdentifier=   $SERVERID
Suffix=   $SUFFIX
RootDN=   cn=Directory Manager
RootDNPwd= $PASSWORD
"""

def check_inst():
    """
    Validate that the appropriate dogtag/RHCS packages have been installed.
    """

    # Check for a couple of binaries we need
    if not os.path.exists('/usr/bin/pkicreate'):
        return False
    if not os.path.exists('/usr/bin/pkisilent'):
        return False

    # This is the template tomcat file for a CA
    if not os.path.exists('/usr/share/pki/ca/conf/server.xml'):
        return False

    return True

def get_preop_pin(instance_root, instance_name):
    preop_pin = None

    filename = instance_root + "/" + instance_name + "/conf/CS.cfg"

    # read the config file and get the preop pin
    try:
        f=open(filename)
    except IOError, e:
        logging.error("Cannot open configuration file." + str(e))
        raise e
    data = f.read()
    data = data.split('\n')
    pattern = re.compile("preop.pin=(.*)" )
    for line in data:
        match = re.search(pattern, line)
        if (match):
            preop_pin=match.group(1)
            break

    if preop_pin is None:
        raise RuntimeError("Unable to find preop.pin in %s. Is your CA already configured?" % filename)

    return preop_pin

def import_pkcs12(input_file, input_passwd, cert_database,
                  cert_passwd):
    ipautil.run(["/usr/bin/pk12util", "-d", cert_database,
                 "-i", input_file,
                 "-k", cert_passwd,
                 "-w", input_passwd])

def get_value(s):
    """
    Parse out a name/value pair from a Javascript variable.
    """
    try:
        expr = s.split('=',1)
        value = expr[1]
        value = value.replace('\"', '')
        value = value.replace(';','')
        value = value.replace('\\n','\n')
        value = value.replace('\\r','\r')
        return value
    except IndexError:
        return None

def find_substring(data, value):
    """
    Scan through a list looking for a string that starts with value.
    """
    for d in data:
        if d.startswith(value):
            return get_value(d)

def get_defList(data):
    """
    Return a dictionary of defList name/value pairs.

    A certificate signing request is specified as a series of these.
    """
    varname = None
    value = None
    skip = False
    defdict = {}
    for d in data:
        if d.startswith("defList = new Object"):
            varname = None
            value = None
            skip = False
        if d.startswith("defList.defId"):
            varname = get_value(d)
        if d.startswith("defList.defVal"):
            value = get_value(d)
            if skip:
                varname = None
                value = None
                skip = False
        if d.startswith("defList.defConstraint"):
            ctype = get_value(d)
            if ctype == "readonly":
                skip = True

        if varname and value:
            defdict[varname] = value
            varname = None
            value = None

    return defdict

def get_outputList(data):
    """
    Return a dictionary of outputList name/value pairs.

    The output from issuing a certificate is a series of these.
    """
    varname = None
    value = None
    outputdict = {}
    for d in data:
        if d.startswith("outputList = new"):
            varname = None
            value = None
        if d.startswith("outputList.outputId"):
            varname = get_value(d)
        if d.startswith("outputList.outputVal"):
            value = get_value(d)

        if varname and value:
            outputdict[varname] = value
            varname = None
            value = None

    return outputdict

class CADSInstance(service.Service):
    def __init__(self, host_name=None, realm_name=None, domain_name=None, dm_password=None):
        service.Service.__init__(self, "pkids")
        self.serverid = "PKI-IPA"
        self.realm_name = realm_name
        self.dm_password = dm_password
        self.sub_dict = None
        self.domain = domain_name
        self.fqdn = host_name
        self.dercert = None
        self.pkcs12_info = None
        self.ds_port = None
        self.master_host = None
        self.nickname = 'Server-Cert'
        self.subject_base = None
        if host_name and realm_name:
            self.principal = "dogtagldap/%s@%s" % (self.fqdn, self.realm_name)
        if realm_name:
            self.suffix = util.realm_to_suffix(self.realm_name)
            self.__setup_sub_dict()
        else:
            self.suffix = None

    def create_instance(self, realm_name, host_name, domain_name,
                        dm_password, pkcs12_info=None, ds_port=DEFAULT_DSPORT,
                        subject_base=None):
        self.ds_port = ds_port
        self.realm_name = realm_name.upper()
        self.suffix = util.realm_to_suffix(self.realm_name)
        self.fqdn = host_name
        self.dm_password = dm_password
        self.domain = domain_name
        self.pkcs12_info = pkcs12_info
        self.subject_base = subject_base
        self.principal = "dogtagldap/%s@%s" % (self.fqdn, self.realm_name)
        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("restarting directory server", self.restart_instance)

        self.start_creation("Configuring directory server for the CA", 30)

    def __setup_sub_dict(self):
        server_root = dsinstance.find_server_root()
        self.sub_dict = dict(FQHN=self.fqdn, SERVERID=self.serverid,
                             PASSWORD=self.dm_password, SUFFIX=self.suffix.lower(),
                             REALM=self.realm_name, USER=PKI_DS_USER,
                             SERVER_ROOT=server_root, DOMAIN=self.domain,
                             TIME=int(time.time()), DSPORT=self.ds_port,
                             GROUP=dsinstance.DS_GROUP)

    def __create_ds_user(self):
        user_exists = True
        try:
            pwd.getpwnam(PKI_DS_USER)
            logging.debug("ds user %s exists" % PKI_DS_USER)
        except KeyError:
            user_exists = False
            logging.debug("adding ds user %s" % PKI_DS_USER)
            args = ["/usr/sbin/useradd", "-g", dsinstance.DS_GROUP,
                                         "-c", "PKI DS System User",
                                         "-d", "/var/lib/dirsrv",
                                         "-s", "/sbin/nologin",
                                         "-M", "-r", PKI_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_exists", user_exists)

    def __create_instance(self):
        self.backup_state("running", dsinstance.is_ds_running())
        self.backup_state("serverid", self.serverid)

        inf_txt = ipautil.template_str(INF_TEMPLATE, self.sub_dict)
        logging.debug("writing inf template")
        inf_fd = ipautil.write_tmp_file(inf_txt)
        inf_txt = re.sub(r"RootDNPwd=.*\n", "", inf_txt)
        logging.debug(inf_txt)
        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)
        inf_fd.close()

    def load_pkcs12(self):
        dirname = dsinstance.config_dirname(self.serverid)
        dsdb = certs.CertDB(self.realm_name, nssdir=dirname)
        if self.pkcs12_info:
            dsdb.create_from_pkcs12(self.pkcs12_info[0], self.pkcs12_info[1])
            server_certs = dsdb.find_server_certs()
            if len(server_certs) == 0:
                raise RuntimeError("Could not find a suitable server cert in import in %s" % self.pkcs12_info[0])

            # We only handle one server cert
            self.nickname = server_certs[0][0]
            self.dercert = dsdb.get_cert_from_db(self.nickname, pem=False)
            dsdb.track_server_cert(self.nickname, self.principal, dsdb.passwd_fname)

    def create_certdb(self):
        """
        Create the dogtag 389-ds instance NSS certificate database. This needs
        to be done after dogtag is installed and configured.
        """
        dirname = dsinstance.config_dirname(self.serverid)
        dsdb = certs.CertDB(self.realm_name, nssdir=dirname, subject_base=self.subject_base)
        cadb = certs.CertDB(self.realm_name, host_name=self.fqdn, subject_base=self.subject_base)
        cadb.export_ca_cert('ipaCert', False)
        dsdb.create_from_cacert(cadb.cacert_fname, passwd=None)
        self.dercert = dsdb.create_server_cert("Server-Cert", self.fqdn, cadb)
        dsdb.track_server_cert("Server-Cert", self.principal, dsdb.passwd_fname)
        dsdb.create_pin_file()

    def enable_ssl(self):
        conn = ipaldap.IPAdmin("127.0.0.1", port=DEFAULT_DSPORT)
        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_ADD, "nsslapd-secureport", str(DEFAULT_DSPORT+1))]
        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", self.nickname)
        entry.setValues("nsSSLToken", "internal (software)")
        entry.setValues("nsSSLActivation", "on")

        conn.addEntry(entry)

        conn.unbind()

    def restart_instance(self):
        try:
            # Have to trick the base class to use the right service name
            sav_name = self.service_name
            self.service_name="dirsrv"
            self.restart(self.serverid)
            self.service_name=sav_name
            if not dsinstance.is_ds_running():
                logging.critical("Failed to restart the directory server. See the installation log for details.")
                sys.exit(1)
        except Exception:
            # TODO: roll back here?
            logging.critical("Failed to restart the directory server. See the installation log for details.")

    def uninstall(self):
        if self.is_configured():
            self.print_msg("Unconfiguring CA directory server")

        running = self.restore_state("running")
        enabled = self.restore_state("enabled")
        serverid = self.restore_state("serverid")
        sav_name = self.service_name
        self.service_name="dirsrv"

        if not running is None:
            self.stop(serverid)

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

        if not serverid is None:
            # drop the trailing / off the config_dirname so the directory
            # will match what is in certmonger
            dirname = dsinstance.config_dirname(serverid)[:-1]
            dsdb = certs.CertDB(self.realm_name, nssdir=dirname)
            dsdb.untrack_server_cert("Server-Cert")
            dsinstance.erase_ds_instance_data(serverid)

        self.service_name="pkids"
        user_exists = self.restore_state("user_exists")

        if user_exists == False:
            try:
                ipautil.run(["/usr/sbin/userdel", PKI_DS_USER])
            except ipautil.CalledProcessError, e:
                logging.critical("failed to delete user %s" % e)
        self.service_name = sav_name

class CAInstance(service.Service):
    """
    In the self-signed case the CA exists in the NSS_DB database.
    When using a dogtag CA the DS database contains just the
    server cert for DS. The mod_nss database will contain the RA agent
    cert that will be used to do authenticated requests against dogtag.

    This is done because we use python-nss and will inherit the opened
    NSS database in mod_python. In nsslib.py we do an nssinit but this will
    return success if the database is already initialized. It doesn't care
    if the database is different or not.

    external is a state machine:
       0 = not an externally signed CA
       1 = generating CSR to be signed
       2 = have signed cert, continue installation
    """

    def __init__(self, realm, ra_db):
        service.Service.__init__(self, "pki-cad")
        self.realm = realm
        self.dm_password = None
        self.admin_password = None
        self.fqdn = None
        self.pkcs12_info = None
        self.clone = False
        # for external CAs
        self.external = 0
        self.csr_file = None
        self.cert_file = None
        self.cert_chain_file = None

        # The same database is used for mod_nss because the NSS context
        # will already have been initialized by Apache by the time
        # mod_python wants to do things.
        self.canickname = get_ca_nickname(realm)
        self.basedn = "o=ipaca"
        self.ca_agent_db = tempfile.mkdtemp(prefix = "tmp-")
        self.ra_agent_db = ra_db
        self.ra_agent_pwd = self.ra_agent_db + "/pwdfile.txt"
        self.ds_port = DEFAULT_DSPORT
        self.domain_name = "IPA"
        self.server_root = "/var/lib"
        self.ra_cert = None
        self.requestId = None

    def __del__(self):
        shutil.rmtree(self.ca_agent_db, ignore_errors=True)

    def is_installed(self):
        """
        Installing with an external CA is a two-step process. This
        is used to determine if the first step has been done.

        Returns True/False
        """
        return os.path.exists(self.server_root + '/' + PKI_INSTANCE_NAME)

    def configure_instance(self, host_name, dm_password,
                           admin_password, ds_port=DEFAULT_DSPORT,
                           pkcs12_info=None, master_host=None, csr_file=None,
                           cert_file=None, cert_chain_file=None,
                           subject_base=None):
        """Create a CA instance. This may involve creating the pki-ca instance
           dogtag instance.

           To create a clone, pass in pkcs12_info.

           Creating a CA with an external signer is a 2-step process. In
           step 1 we generate a CSR. In step 2 we are given the cert and
           chain and actually proceed to create the CA. For step 1 set
           csr_file. For step 2 set cert_file and cert_chain_file.
        """
        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 = "O=%s" % self.realm
        else:
            self.subject_base = subject_base

        # Determine if we are installing as an externally-signed CA and
        # what stage we're in.
        if csr_file is not None:
            self.csr_file=csr_file
            self.external=1
        elif cert_file is not None:
            self.cert_file=cert_file
            self.cert_chain_file=cert_chain_file
            self.external=2

        self.step("creating certificate server user", self.__create_ca_user)
        if not ipautil.dir_exists("/var/lib/pki-ca"):
            self.step("creating pki-ca instance", self.create_instance)
        self.step("restarting certificate server", self.__restart_instance)
        self.step("configuring certificate server instance", self.__configure_instance)
        # Step 1 of external is getting a CSR so we don't need to do these
        # steps until we get a cert back from the external CA.
        if self.external != 1:
            self.step("restarting certificate server", self.__restart_instance)
            if not self.clone:
                self.step("creating CA agent PKCS#12 file in /root", self.__create_ca_agent_pkcs12)
            self.step("creating RA agent certificate database", self.__create_ra_agent_db)
            self.step("importing CA chain to RA certificate database", self.__import_ca_chain)
            if not self.clone:
                self.step("restarting certificate server", self.__restart_instance)
                self.step("requesting RA certificate from CA", self.__request_ra_certificate)
                self.step("issuing RA agent certificate", self.__issue_ra_cert)
                self.step("adding RA agent as a trusted user", self.__configure_ra)
            self.step("fixing RA database permissions", self.fix_ra_perms)
            self.step("setting up signing cert profile", self.__setup_sign_profile)
            self.step("set up CRL publishing", self.__enable_crl_publish)
            self.step("configuring certificate server to start on boot", self.__enable)
            if not self.clone:
                # A clone will be restarted in ipa-replica-install
                self.step("restarting certificate server", self.__restart_instance)

        self.start_creation("Configuring certificate server", 360)

    def create_instance(self):
        """
        If for some reason the instance doesn't exist, create a new one."
        """

        args = ['/usr/bin/pkicreate',
                '-pki_instance_root', '/var/lib',
                '-pki_instance_name', PKI_INSTANCE_NAME,
                '-subsystem_type', 'ca',
                '-agent_secure_port', str(AGENT_SECURE_PORT),
                '-ee_secure_port', str(EE_SECURE_PORT),
                '-admin_secure_port', str(ADMIN_SECURE_PORT),
                '-ee_secure_client_auth_port', str(EE_CLIENT_AUTH_PORT),
                '-unsecure_port', str(UNSECURE_PORT),
                '-tomcat_server_port', str(TOMCAT_SERVER_PORT),
                '-redirect', 'conf=/etc/pki-ca',
                '-redirect', 'logs=/var/log/pki-ca',
        ]
        ipautil.run(args)

    def __enable(self):
        self.backup_state("enabled", self.is_enabled())
        # We do not let the system start IPA components on its own,
        # Instead we reply on the IPA init script to start only enabled
        # components as found in our LDAP configuration tree
        # We need to install DS before we can actually ldap_enable a service.
        # so actual enablement is delayed.

    def __create_ca_user(self):
        user_exists = True
        try:
            pwd.getpwnam(PKI_USER)
            logging.debug("ca user %s exists" % PKI_USER)
        except KeyError:
            user_exists = False
            logging.debug("adding ca user %s" % PKI_USER)
            args = ["/usr/sbin/useradd", "-c", "CA System User",
                                         "-d", "/var/lib",
                                         "-s", "/sbin/nologin",
                                         "-M", "-r", PKI_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_exists", user_exists)

    def __configure_instance(self):
        preop_pin = get_preop_pin(self.server_root, PKI_INSTANCE_NAME)

        try:
            args = ["/usr/bin/perl", "/usr/bin/pkisilent",  "ConfigureCA",
                    "-cs_hostname", self.fqdn,
                    "-cs_port", str(ADMIN_SECURE_PORT),
                    "-client_certdb_dir", self.ca_agent_db,


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