/usr/sbin/edubuntu-server-auth is in edubuntu-server-client 15.01build1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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# -*- coding: utf-8 -*-
# Copyright (C) 2012-2014 Stéphane Graber
# Author: Stéphane Graber <stgraber@ubuntu.com>
# 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 2 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 can find the license on Debian systems in the file
# /usr/share/common-licenses/GPL-2
import argparse
import configparser
import gettext
import os
import socket
import subprocess
import sys
_ = gettext.gettext
gettext.textdomain("edubuntu-server-auth")
# Constants
PKG_LIST = ("libpam-sss", "libnss-sss", "libsss-sudo",
"libsasl2-modules-gssapi-heimdal", "samba-common-bin")
# Common functions
def backup_config(path):
if os.path.exists(path) and not os.path.exists("%s.pre-edubuntu" % path):
os.rename(path, "%s.pre-edubuntu" % path)
def get_username(args):
username = ""
password = ""
if hasattr(args, "username"):
username = args.username
else:
username = os.environ['USER']
if hasattr(args, "password"):
if args.password == "-":
password = sys.stdin.read().strip()
else:
password = args.password
if password:
return "%s%%%s" % (username, password)
else:
return username
def restore_config(path):
if os.path.exists(path):
os.remove(path)
if os.path.exists("%s.pre-edubuntu" % path):
os.rename("%s.pre-edubuntu" % path, path)
# The various actions
def join_domain(args):
krb5_domain = args.domain.upper()
ldap_dn = "DC=%s" % ",DC=".join(args.domain.split("."))
smb_workgroup = args.domain.split(".")[0].upper()
smb_hostname = socket.gethostname().upper()
domain_sid = None
enctypes = "rc4-hmac aes256-cts-hmac-sha1-96 aes128-cts-hmac-sha1-96"
# Mark the packages for installation
cache = apt.Cache()
for pkg in PKG_LIST:
if pkg in cache:
cache[pkg].mark_install()
else:
print("Unable to find package: %s" % pkg)
sys.exit(1)
if cache.get_changes():
print("Installing %s needed packages." % len(cache.get_changes()))
cache.update()
cache.commit()
# Configure kerberos
backup_config("/etc/krb5.conf")
backup_config("/etc/krb5.keytab")
with open("/etc/krb5.conf", "w+") as fd:
fd.write("""[libdefaults]
default_realm = %s
dns_lookup_realm = false
dns_lookup_kdc = true
ticket_lifetime = 24h
allow_weak_crypto = true
default_tgs_enctypes = %s
default_tkt_enctypes = %s
permitted_enctypes = %s
[domain_realm]
.%s = %s
%s = %s
""" % (
krb5_domain, enctypes, enctypes, enctypes,
args.domain, krb5_domain, args.domain, krb5_domain))
os.fchmod(fd.fileno(), 0o644)
os.fchown(fd.fileno(), 0, 0)
# Configure samba
backup_config("/etc/samba/smb.conf")
with open("/etc/samba/smb.conf", "w+") as fd:
fd.write("""[global]
workgroup = %s
realm = %s
server string = %s
netbios name = %s
security = ads
kerberos method = system keytab
passdb backend = tdbsam
""" % (smb_workgroup, args.domain, smb_hostname, smb_hostname))
os.fchmod(fd.fileno(), 0o644)
os.fchown(fd.fileno(), 0, 0)
command = ["net", "ads", "join", "-U", get_username(args)]
while 1:
# Join
subprocess.call(command)
# Get the SID
net = subprocess.Popen(['net', 'getdomainsid'], stdout=subprocess.PIPE,
stderr=subprocess.PIPE, universal_newlines=True)
net.wait()
for line in net.stdout:
line = line.strip()
if line.startswith("SID for domain"):
domain_sid = line.split()[-1]
break
if not domain_sid:
print("Failed to join domain. Try again.")
continue
break
# Configure lightdm
if os.path.exists("/etc/lightdm/lightdm.conf"):
write_lightdm = False
lightdm = configparser.ConfigParser()
lightdm.read("/etc/lightdm/lightdm.conf")
if not lightdm.has_section("SeatDefaults"):
lightdm.add_section("SeatDefaults")
if not lightdm.has_option("SeatDefaults", "greeter-show-manual-login"):
lightdm.set("SeatDefaults", "greeter-show-manual-login", "true")
write_lightdm = True
elif lightdm.get("SeatDefaults",
"greeter-show-manual-login") != "true":
lightdm.set("SeatDefaults", "greeter-show-manual-login", "true")
write_lightdm = True
if write_lightdm:
with open("/etc/lightdm/lightdm.conf", "w+") as fd:
lightdm.write(fd)
# Configure PAM
with open("/usr/share/pam-configs/edubuntu-domain", "w+") as fd:
fd.write("""Name: edubuntu-server settings
Default: yes
Priority: 128
Session-Type: Additional
Session-Interactive-Only: yes
Session:
optional pam_mkhomedir.so
""")
os.fchmod(fd.fileno(), 0o644)
os.fchown(fd.fileno(), 0, 0)
with open(os.devnull, "w") as fd:
subprocess.call(["pam-auth-update", "--package"],
stdout=fd, stderr=fd)
# Configure sssd
with open(os.devnull, "w") as fd:
subprocess.call(["stop", "sssd"],
stdout=fd, stderr=fd)
backup_config("/etc/sssd/sssd.conf")
with open("/etc/sssd/sssd.conf", "w+") as fd:
fd.write("""[sssd]
domains = Edubuntu
services = nss, pam, sudo
config_file_version = 2
sbus_timeout = 30
debug_level = 0
[nss]
default_shell = /bin/bash
[domain/Edubuntu]
enumerate = false
cache_credentials = true
fallback_homedir = /home/%%u
id_provider = ldap
auth_provider = krb5
chpass_provider = krb5
sudo_provider = ldap
dns_discovery_domain = %s
krb5_realm = %s
ldap_idmap_default_domain_sid = %s
ldap_schema = ad
ldap_id_mapping = true
ldap_user_gecos = displayName
ldap_force_upper_case_realm = true
ldap_sudo_search_base = OU=sudoers,%s
ldap_sasl_mech = GSSAPI
""" % (args.domain, krb5_domain, domain_sid, ldap_dn))
os.fchmod(fd.fileno(), 0o600)
os.fchown(fd.fileno(), 0, 0)
with open(os.devnull, "w") as fd:
subprocess.call(["start", "sssd"],
stdout=fd, stderr=fd)
def leave_domain(args):
# Unconfigure samba
if os.path.exists("/etc/samba/smb.conf"):
command = ["net", "ads", "leave", "-U", get_username(args)]
if subprocess.call(command) != 0:
print("Failed to leave the domain.")
sys.exit(1)
restore_config("/etc/samba/smb.conf")
# Unconfigure sssd
restore_config("/etc/sssd/sssd.conf")
with open(os.devnull, "w") as fd:
if os.path.exists("/etc/sssd/sssd.conf"):
subprocess.call(["initctl", "restart", "sssd"],
stdout=fd, stderr=fd)
else:
subprocess.call(["initctl", "stop", "sssd"],
stdout=fd, stderr=fd)
# Remove the Kerberos configuration
restore_config("/etc/krb5.conf")
restore_config("/etc/krb5.keytab")
# Remove the PAM configuration
restore_config("/usr/share/pam-configs/edubuntu-domain")
with open(os.devnull, "w") as fd:
subprocess.call(["pam-auth-update", "--package", "--remove",
"edubuntu-domain"],
stdout=fd, stderr=fd)
# Unconfigure lightdm
if os.path.exists("/etc/lightdm/lightdm.conf"):
lightdm = configparser.ConfigParser()
lightdm.read("/etc/lightdm/lightdm.conf")
if lightdm.has_section("SeatDefaults") and \
lightdm.has_option("SeatDefaults",
"greeter-show-manual-login"):
lightdm.remove_option("SeatDefaults", "greeter-show-manual-login")
with open("/etc/lightdm/lightdm.conf", "w+") as fd:
lightdm.write(fd)
# Begin parsing the command line
parser = argparse.ArgumentParser(
description=_("Edubuntu server authentication"),
formatter_class=argparse.RawTextHelpFormatter)
# Commands
subparsers = parser.add_subparsers()
subparser_join = subparsers.add_parser('join', help=_('Join the domain'))
subparser_join.set_defaults(action=join_domain)
subparser_join.add_argument(dest="domain", metavar="DOMAIN-FQDN",
help=_("Fully-Qualified-Domain-Name for the domain"
"(e.g. edubuntu.org)"))
subparser_join.add_argument("-U", "--username", dest="username",
metavar="USERNAME",
help=_("Username of a Domain Administrator"))
subparser_join.add_argument("-P", "--password", dest="password",
metavar="PASSWORD",
help=_("Password of a Domain Administrator "
"('-' for stdin)"))
subparser_leave = subparsers.add_parser('leave', help=_('Leave the domain'))
subparser_leave.add_argument("-U", "--username", dest="username",
metavar="USERNAME",
help=_("Username of a Domain Administrator"))
subparser_leave.add_argument("-P", "--password", dest="password",
metavar="PASSWORD",
help=_("Password of a Domain Administrator "
"('-' for stdin)"))
subparser_leave.set_defaults(action=leave_domain)
args = parser.parse_args()
# Basic requirements check
## Check that we have an action
if not hasattr(args, "action"):
parser.error(_("You must specifiy an action."))
sys.exit(1)
## The user needs to be uid 0
if not os.geteuid() == 0:
parser.error(_("You must be root to run this script. "
"Try running: sudo %s" % (sys.argv[0])))
sys.exit(1)
# Import apt now so we don't have to build-depend on it
import apt
args.action(args)
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