From 29a7a7e8cee8ec767ee8f5bb67534c68d2fcc2b5 Mon Sep 17 00:00:00 2001
From: Sumit Bose <sbose@redhat.com>
Date: Wed, 7 Sep 2011 10:17:12 +0200
Subject: Add ipa-adtrust-install utility

https://fedorahosted.org/freeipa/ticket/1619
---
 ipaserver/install/adtrustinstance.py | 281 +++++++++++++++++++++++++++++++++++
 1 file changed, 281 insertions(+)
 create mode 100644 ipaserver/install/adtrustinstance.py

(limited to 'ipaserver/install/adtrustinstance.py')

diff --git a/ipaserver/install/adtrustinstance.py b/ipaserver/install/adtrustinstance.py
new file mode 100644
index 00000000..f2cc3327
--- /dev/null
+++ b/ipaserver/install/adtrustinstance.py
@@ -0,0 +1,281 @@
+# Authors: Sumit Bose <sbose@redhat.com>
+#
+# Copyright (C) 2011  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 os
+import errno
+import ldap
+import service
+import tempfile
+import installutils
+from ipaserver import ipaldap
+from ipaserver.install.dsinstance import realm_to_serverid
+from ipalib import errors
+from ipapython import sysrestore
+from ipapython import ipautil
+
+import random
+import string
+import struct
+
+allowed_netbios_chars = string.ascii_uppercase + string.digits
+
+def check_inst(unattended):
+    for f in ['/usr/sbin/smbd', '/usr/bin/net', '/usr/bin/smbpasswd']:
+        if not os.path.exists(f):
+            print "%s was not found on this system" % f
+            print "Please install the 'samba' packages and start the installation again"
+            return False
+
+    #TODO: Add check for needed samba4 libraries
+
+    return True
+
+def ipa_smb_conf_exists():
+    try:
+        fd = open('/etc/samba/smb.conf', 'r')
+    except IOError, e:
+        if e.errno == errno.ENOENT:
+            return False
+
+    lines = fd.readlines()
+    fd.close()
+    for line in lines:
+        if line.startswith('### Added by IPA Installer ###'):
+            return True
+    return False
+
+
+def check_netbios_name(s):
+    # NetBIOS names may not be longer than 15 allowed characters
+    if not s or len(s) > 15 or ''.join([c for c in s if c not in allowed_netbios_chars]):
+        return False
+
+    return True
+
+def make_netbios_name(s):
+    return ''.join([c for c in s.split('.')[0].upper() if c in allowed_netbios_chars])[:15]
+
+class ADTRUSTInstance(service.Service):
+    def __init__(self, fstore=None, dm_password=None):
+        service.Service.__init__(self, "smb", dm_password=dm_password)
+
+        if fstore:
+            self.fstore = fstore
+        else:
+            self.fstore = sysrestore.FileStore('/var/lib/ipa/sysrestore')
+
+    def __create_samba_user(self):
+        print "The user for Samba is %s" % self.smb_dn
+        try:
+            self.admin_conn.getEntry(self.smb_dn, ldap.SCOPE_BASE)
+            print "Samba user entry exists, resetting password"
+
+            self.admin_conn.modify_s(self.smb_dn, [(ldap.MOD_REPLACE, "userPassword", self.smb_dn_pwd)])
+            return
+
+        except errors.NotFound:
+            pass
+
+        # The user doesn't exist, add it
+        entry = ipaldap.Entry(self.smb_dn)
+        entry.setValues("objectclass", ["account", "simplesecurityobject"])
+        entry.setValues("uid", "samba")
+        entry.setValues("userPassword", self.smb_dn_pwd)
+        self.admin_conn.add_s(entry)
+
+        # And finally grant it permission to read NT passwords, we do not want
+        # to support LM passwords so there is no need to allow access to them
+        mod = [(ldap.MOD_ADD, 'aci',
+            str(['(targetattr = "sambaNTPassword")(version 3.0; acl "Samba user can read NT passwords"; allow (read) userdn="ldap:///%s";)' % self.smb_dn]))]
+        try:
+            self.admin_conn.modify_s(self.suffix, mod)
+        except ldap.TYPE_OR_VALUE_EXISTS:
+            logging.debug("samba user aci already exists in suffix %s on %s" % (self.suffix, self.admin_conn.host))
+
+    def __gen_sid_string(self):
+        sub_ids = struct.unpack("<LLL", os.urandom(12))
+        return "S-1-5-21-%d-%d-%d" % (sub_ids[0], sub_ids[1], sub_ids[2])
+
+    def __create_samba_domain_object(self):
+        trust_dn = "cn=trusts,%s" % self.suffix
+        smb_dom_dn = "cn=ad,%s" % trust_dn
+
+        try:
+            self.admin_conn.getEntry(smb_dom_dn, ldap.SCOPE_BASE)
+            print "Samba domain object already exists"
+            return
+        except errors.NotFound:
+            pass
+
+        try:
+            self.admin_conn.getEntry(trust_dn, ldap.SCOPE_BASE)
+        except errors.NotFound:
+            entry = ipaldap.Entry(trust_dn)
+            entry.setValues("objectclass", ["nsContainer"])
+            entry.setValues("cn", "trusts")
+            self.admin_conn.add_s(entry)
+
+        entry = ipaldap.Entry(smb_dom_dn)
+        entry.setValues("objectclass", ["sambaDomain", "nsContainer"])
+        entry.setValues("cn", "ad")
+        entry.setValues("sambaDomainName", self.netbios_name)
+        entry.setValues("sambaSID", self.__gen_sid_string())
+        #TODO: which MAY attributes do we want to set ?
+        self.admin_conn.add_s(entry)
+
+    def __write_smb_conf(self):
+        self.fstore.backup_file(self.smb_conf)
+
+        fd = open(self.smb_conf, "w")
+        fd.write('### Added by IPA Installer ###\n')
+        fd.write('[global]\n')
+        fd.write('config backend = registry\n')
+        fd.close()
+
+    def __write_smb_registry(self):
+        template = os.path.join(ipautil.SHARE_DIR, "smb.conf.template")
+        conf = ipautil.template_file(template, self.sub_dict)
+        [fd, tmp_name] = tempfile.mkstemp()
+        os.write(fd, conf)
+        os.close(fd)
+
+        args = ["/usr/bin/net", "conf", "import", tmp_name]
+
+        try:
+            ipautil.run(args)
+        finally:
+            os.remove(tmp_name)
+
+    def __set_smb_ldap_password(self):
+        args = ["/usr/bin/smbpasswd", "-c", self.smb_conf, "-s", "-W" ]
+
+        ipautil.run(args, stdin = self.smb_dn_pwd + "\n" + self.smb_dn_pwd + "\n" )
+
+    def __setup_principal(self):
+        cifs_principal = "cifs/" + self.fqdn + "@" + self.realm_name
+        installutils.kadmin_addprinc(cifs_principal)
+
+        self.move_service(cifs_principal)
+
+        try:
+            ipautil.run(["ipa-rmkeytab", "--principal", cifs_principal,
+                                         "-k", "/etc/krb5.keytab"])
+        except ipautil.CalledProcessError, e:
+            if e.returncode != 5:
+                logging.critical("Failed to remove old key for %s" % cifs_principal)
+
+        try:
+            ipautil.run(["ipa-getkeytab", "--server", self.fqdn,
+                                          "--principal", cifs_principal,
+                                          "-k", "/etc/krb5.keytab"])
+        except ipautil.CalledProcessError, e:
+            logging.critical("Failed to add key for %s" % cifs_principal)
+
+    def __start(self):
+        try:
+            self.start()
+        except:
+            logging.critical("smbd service failed to start")
+
+    def __stop(self):
+        self.backup_state("running", self.is_running())
+        try:
+            self.stop()
+        except:
+            pass
+
+    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
+        try:
+            self.ldap_enable('ADTRUST', self.fqdn, self.dm_password, self.suffix)
+        except ldap.ALREADY_EXISTS:
+            logging.critical("ADTRUST Service startup entry already exists.")
+            pass
+
+    def __setup_sub_dict(self):
+        self.sub_dict = dict(REALM = self.realm_name,
+                             SUFFIX = self.suffix,
+                             NETBIOS_NAME = self.netbios_name,
+                             SMB_DN = self.smb_dn,
+                             LDAPI_SOCKET = self.ldapi_socket)
+
+    def setup(self, fqdn, ip_address, realm_name, domain_name, netbios_name,
+              smbd_user="samba"):
+        self.fqdn =fqdn
+        self.ip_address = ip_address
+        self.realm_name = realm_name
+        self.domain_name = domain_name
+        self.netbios_name = netbios_name
+        self.smbd_user = smbd_user
+        self.suffix = ipautil.realm_to_suffix(self.realm_name)
+        self.ldapi_socket = "%%2fvar%%2frun%%2fslapd-%s.socket" % realm_to_serverid(self.realm_name)
+
+        self.smb_conf = "/etc/samba/smb.conf"
+
+        self.smb_dn = "uid=samba,cn=sysaccounts,cn=etc,%s" % self.suffix
+        self.smb_dn_pwd = ipautil.ipa_generate_password()
+
+        self.__setup_sub_dict()
+
+
+    def create_instance(self):
+
+        self.ldap_connect()
+
+        self.step("stopping smbd", self.__stop)
+        self.step("create samba user", self.__create_samba_user)
+        self.step("create samba domain object", self.__create_samba_domain_object)
+        self.step("create samba config registry", self.__write_smb_registry)
+        self.step("writing samba config file", self.__write_smb_conf)
+        self.step("setting password for the samba user", self.__set_smb_ldap_password)
+        self.step("Adding cifs Kerberos principal", self.__setup_principal)
+        self.step("configuring smbd to start on boot", self.__enable)
+        self.step("starting smbd", self.__start)
+
+        self.start_creation("Configuring smbd:")
+
+    def uninstall(self):
+        if self.is_configured():
+            self.print_msg("Unconfiguring %s" % self.service_name)
+
+        running = self.restore_state("running")
+        enabled = self.restore_state("enabled")
+
+        try:
+            self.stop()
+        except:
+            pass
+
+        for f in [self.smb_conf]:
+            try:
+                self.fstore.restore_file(f)
+            except ValueError, error:
+                logging.debug(error)
+                pass
+
+        if not enabled is None and not enabled:
+            self.disable()
+
+        if not running is None and running:
+            self.start()
-- 
cgit