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Bug 1791617 - Failed user login throws two stderr messages on user terminal due to unreadable GPO
Summary: Failed user login throws two stderr messages on user terminal due to unreadab...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: sssd
Version: 8.2
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: 8.0
Assignee: Paweł Poławski
QA Contact: Dan Lavu
URL:
Whiteboard: sync-to-jira qereview
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2020-01-16 09:31 UTC by Kaushik Banerjee
Modified: 2020-11-04 02:08 UTC (History)
10 users (show)

Fixed In Version: sssd-2.3.0-1.el8
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2020-11-04 02:04:28 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Github SSSD sssd issues 5094 0 None closed Unreadable GPOs should not be logged as a critical failure 2020-11-03 11:50:02 UTC
Red Hat Product Errata RHBA-2020:4569 0 None None None 2020-11-04 02:04:48 UTC

Description Kaushik Banerjee 2020-01-16 09:31:18 UTC 
Description of problem:
Failed user login does not return to prompt on login denial due to unreadable GPO

Version-Release number of selected component (if applicable):
sssd-ad-2.2.3-6.el8

How reproducible:
Always

Steps to Reproduce:

1. Setup unreadable GPO

2. Setup sssd with following config:
# cat /etc/sssd/sssd.conf 
[sssd]
domains = td5e5666.com
config_file_version = 2
services = nss, pam

[domain/td5e5666.com]
ad_domain = td5e5666.com
krb5_realm = TD5E5666.COM
realmd_tags = manages-system joined-with-adcli 
cache_credentials = True
id_provider = ad
krb5_store_password_if_offline = True
default_shell = /bin/bash
ldap_sasl_authid = CI-VM-10-0-155-$
ldap_id_mapping = True
use_fully_qualified_names = True
fallback_homedir = /home/%u@%d
access_provider = ad
ad_gpo_access_control = enforcing
ad_gpo_ignore_unreadable = false

3. Try to login using any one of the users
# ssh -l kaushik.allow localhost
kaushik.allow@localhost's password: 

Broadcast message from systemd-journald.upshift.rdu2.redhat.com (Thu 2020-01-16 03:51:24 EST):

sssd[be[td5e5666.com]][20578]: Group Policy Container with DN [cn={922D526B-A7C5-4919-BE2D-9E87ED3394BC},cn=policies,cn=system,DC=td5e5666,DC=com] is unreadable or has unreadable or missing attributes. In order to fix this make sure that this AD object has following attributes readable: nTSecurityDescriptor, cn, gPCFileSysPath, gPCMachineExtensionNames, gPCFunctionalityVersion, flags. Alternatively if you do not have access to the server or can not change permissions on this object, you can use option ad_gpo_ignore_unreadable = True which will skip this GPO. See ad_gpo_ignore_unreadable in 'man sssd-ad' for details.

Connection closed by ::1 port 22
[root@ci-vm-10-0-155-109 ~]# 
Message from syslogd@hostname1-8e4a41 at Jan 16 03:51:24 ...
 sssd[be[td5e5666.com]][20578]:Group Policy Container with DN [cn={922D526B-A7C5-4919-BE2D-9E87ED3394BC},cn=policies,cn=system,DC=td5e5666,DC=com] is unreadable or has unreadable or missing attributes. In order to fix this make sure that this AD object has following attributes readable: nTSecurityDescriptor, cn, gPCFileSysPath, gPCMachineExtensionNames, gPCFunctionalityVersion, flags. Alternatively if you do not have access to the server or can not change permissions on this object, you can use option ad_gpo_ignore_unreadable = True which will skip this GPO. See ad_gpo_ignore_unreadable in 'man sssd-ad' for details.


Actual results:
The stderr appears twice on the user terminal and the user is not returned to the prompt

Expected results:
1. Sanitized output instead of showing the same stderr generated 
2. The output should also be shown only once.

Additional info:
Comment 2 Tomas Halman 2020-01-16 15:17:10 UTC 
Upstream ticket

https://pagure.io/SSSD/sssd/issue/4133
Comment 8 Pavel Březina 2020-03-04 11:54:49 UTC 
* `master`
    * 9188aa17d9c4dfec1d5744981ea8855465965808 - GPO: Duplicated error message for unreadable GPO
Comment 11 Dan Lavu 2020-08-10 23:15:29 UTC 
Verified against sssd-2.3.0-7.el8.x86_64

[root@ci-vm-10-0-104-249 ad_gpo_hbac]# ssh allowed_user@localhost 
allowed_user@localhost's password: 
Connection closed by ::1 port 22


Contains no error message output

Logs contain the error message.

(2020-08-10 19:11:46): [be[adgpo12r83.com]] [ad_gpo_missing_or_unreadable_attr] (0x0020): Group Policy Container with DN [cn={89F1BEFA-DE36-4C85-84A0-03D9EB37650C},cn=policies,cn=system,DC=adgpo12r83,DC=com] is unreadable or has unreadable or missing attributes. In order to fix this make sure that this AD object has following attributes readable: nTSecurityDescriptor, cn, gPCFileSysPath, gPCMachineExtensionNames, gPCFunctionalityVersion, flags. Alternatively if you do not have access to the server or can not change permissions on this object, you can use option ad_gpo_ignore_unreadable = True which will skip this GPO. See ad_gpo_ignore_unreadable in 'man sssd-ad' for details.
Comment 15 errata-xmlrpc 2020-11-04 02:04:28 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (sssd bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:4569
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