From 0d817ae63a4ad8ba7a29910a9342a78e15e89593 Mon Sep 17 00:00:00 2001 From: Alexander Bokovoy Date: Mar 30 2017 11:17:21 +0000 Subject: adtrust: make sure that runtime hostname result is consistent with the configuration FreeIPA's `ipasam` module to Samba uses gethostname() call to identify own server's host name. This value is then used in multiple places, including construction of cifs/host.name principal. `ipasam` module always uses GSSAPI authentication when talking to LDAP, so Kerberos keys must be available in the /etc/samba/samba.keytab. However, if the principal was created using non-FQDN name but system reports FQDN name, `ipasam` will fail to acquire Kerberos credentials. Same with FQDN principal and non-FQDN hostname. Also host name and principal name must have the same case. Report an error when configuring ADTrust instance with inconsistent runtime hostname and configuration. This prevents errors like this: [20/21]: starting CIFS services ipa : CRITICAL CIFS services failed to start where samba logs have this: [2017/03/20 06:34:27.385307, 0] ipa_sam.c:4193(bind_callback_cleanup) kerberos error: code=-1765328203, message=Keytab contains no suitable keys for cifs/ipatrust@EXAMPLE.COM [2017/03/20 06:34:27.385476, 1] ../source3/lib/smbldap.c:1206(get_cached_ldap_connect) Connection to LDAP server failed for the 16 try! Fixes https://pagure.io/freeipa/issue/6786 Reviewed-By: Martin Basti --- diff --git a/ipaserver/install/adtrustinstance.py b/ipaserver/install/adtrustinstance.py index 0b18985..b4db055 100644 --- a/ipaserver/install/adtrustinstance.py +++ b/ipaserver/install/adtrustinstance.py @@ -27,6 +27,7 @@ import uuid import string import struct import re +import socket import six @@ -689,6 +690,15 @@ class ADTRUSTInstance(service.Service): except Exception as e: root_logger.critical("Enabling nsswitch support in slapi-nis failed with error '%s'" % e) + def __validate_server_hostname(self): + hostname = socket.gethostname() + if hostname != self.fqdn: + raise ValueError("Host reports different name than configured: " + "'%s' versus '%s'. Samba requires to have " + "the same hostname or Kerberos principal " + "'cifs/%s' will not be found in Samba keytab." % + (hostname, self.fqdn, self.fqdn)) + def __start(self): try: self.start() @@ -804,6 +814,8 @@ class ADTRUSTInstance(service.Service): api.Backend.ldap2.add_entry(entry) def create_instance(self): + self.step("validate server hostname", + self.__validate_server_hostname) self.step("stopping smbd", self.__stop) self.step("creating samba domain object", \ self.__create_samba_domain_object)