# Authors: Rob Crittenden <rcritten@redhat.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 os
import os.path
import subprocess
import string
import tempfile
import logging
import pwd
import fileinput
import sys
import time
import shutil

import service
import certs
import dsinstance
import installutils
from ipa import ipautil

HTTPD_DIR = "/etc/httpd"
SSL_CONF = HTTPD_DIR + "/conf.d/ssl.conf"
NSS_CONF = HTTPD_DIR + "/conf.d/nss.conf"
NSS_DIR  = HTTPD_DIR + "/alias"

selinux_warning = """WARNING: could not set selinux boolean httpd_can_network_connect to true.
The web interface may not function correctly until this boolean is
successfully change with the command:
   /usr/sbin/setsebool -P httpd_can_network_connect true
Try updating the policycoreutils and selinux-policy packages.
"""

class HTTPInstance(service.Service):
    def __init__(self):
        service.Service.__init__(self, "httpd")

    def create_instance(self, realm, fqdn):
        self.fqdn = fqdn
        self.realm = realm
        self.domain = fqdn[fqdn.find(".")+1:]
        self.sub_dict = { "REALM" : realm, "FQDN": fqdn, "DOMAIN" : self.domain }
        
        self.start_creation(7, "Configuring the web interface")
        
        self.__disable_mod_ssl()
        self.__set_mod_nss_port()
        self.__configure_http()
        self.__create_http_keytab()
        self.__setup_ssl()
        self.__setup_autoconfig()

        self.step("restarting httpd")
        self.restart()

        self.step("configuring httpd to start on boot")
        self.chkconfig_on()

        self.done_creation()

    def __selinux_config(self):
        self.step("configuring SELinux for httpd")
        selinux=0
        try:
            if (os.path.exists('/usr/sbin/selinuxenabled')):
                ipautil.run(["/usr/sbin/selinuxenabled"])
                selinux=1
        except ipautil.CalledProcessError:
            # selinuxenabled returns 1 if not enabled
            pass

        if selinux:
            # Allow apache to connect to the turbogears web gui
            # This can still fail even if selinux is enabled
            try:
                ipautil.run(["/usr/sbin/setsebool", "-P", "httpd_can_network_connect", "true"])
            except:
                self.print_msg(selinux_warning)
                
    def __create_http_keytab(self):
        self.step("creating a keytab for httpd")
        try:
            if ipautil.file_exists("/etc/httpd/conf/ipa.keytab"):
                os.remove("/etc/httpd/conf/ipa.keytab")
        except os.error:
            print "Failed to remove /etc/httpd/conf/ipa.keytab."
        (kwrite, kread, kerr) = os.popen3("/usr/kerberos/sbin/kadmin.local")
        kwrite.write("addprinc -randkey HTTP/"+self.fqdn+"@"+self.realm+"\n")
        kwrite.flush()
        kwrite.write("ktadd -k /etc/httpd/conf/ipa.keytab HTTP/"+self.fqdn+"@"+self.realm+"\n")
        kwrite.flush()
        kwrite.close()
        kread.close()
        kerr.close()

        # give kadmin time to actually write the file before we go on
	retry = 0
        while not ipautil.file_exists("/etc/httpd/conf/ipa.keytab"):
            time.sleep(1)
            retry += 1
            if retry > 15:
                print "Error timed out waiting for kadmin to finish operations\n"
                sys.exit(1)

        pent = pwd.getpwnam("apache")
        os.chown("/etc/httpd/conf/ipa.keytab", pent.pw_uid, pent.pw_gid)

    def __configure_http(self):
        self.step("configuring httpd")
        http_txt = ipautil.template_file(ipautil.SHARE_DIR + "ipa.conf", self.sub_dict)
        http_fd = open("/etc/httpd/conf.d/ipa.conf", "w")
        http_fd.write(http_txt)
        http_fd.close()                


    def __disable_mod_ssl(self):
        self.step("disabling mod_ssl in httpd")
        if os.path.exists(SSL_CONF):
            os.rename(SSL_CONF, "%s.moved_by_ipa" % SSL_CONF)

    def __set_mod_nss_port(self):
        self.step("Setting mod_nss port to 443")
        if installutils.update_file(NSS_CONF, '8443', '443') != 0:
            print "Updating %s failed." % NSS_CONF

    def __setup_ssl(self):
        self.step("Setting up ssl")
        ds_ca = certs.CertDB(dsinstance.config_dirname(self.realm))
        ca = certs.CertDB(NSS_DIR)
        ds_ca.cur_serial = 2000
        ca.create_from_cacert(ds_ca.cacert_fname)
        ca.create_server_cert("Server-Cert", "cn=%s,ou=Apache Web Server" % self.fqdn, ds_ca)
        ca.create_signing_cert("Signing-Cert", "cn=%s,ou=Signing Certificate,o=Identity Policy Audit" % self.fqdn, ds_ca)

    def __setup_autoconfig(self):
        prefs_txt = ipautil.template_file(ipautil.SHARE_DIR + "preferences.html.template", self.sub_dict)
        prefs_fd = open("/usr/share/ipa/html/preferences.html", "w")
        prefs_fd.write(prefs_txt)
        prefs_fd.close()                

        # The signing cert is generated in __setup_ssl
        ds_ca = certs.CertDB(dsinstance.config_dirname(self.realm))
        ca = certs.CertDB(NSS_DIR)

        # Publish the CA certificate
        shutil.copy(ds_ca.cacert_fname, "/usr/share/ipa/html/ca.crt")
        os.chmod("/usr/share/ipa/html/ca.crt", 0444)

        try:
            shutil.rmtree("/tmp/ipa")
        except:
            pass
        os.mkdir("/tmp/ipa")
        shutil.copy("/usr/share/ipa/html/preferences.html", "/tmp/ipa")

        ca.run_signtool(["-k", "Signing-Cert",
                         "-Z", "/usr/share/ipa/html/configure.jar",
                         "-e", ".html",
                         "/tmp/ipa"])
        shutil.rmtree("/tmp/ipa")